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Sample records for aco astm a-508

  1. Reactor pressure vessel steels ASTM A533B and A508 Cl.2

    International Nuclear Information System (INIS)

    Pelli, R.; Kemppainen, M.; Toerroenen, K.

    1979-11-01

    This report presents the tensile test results of steels ASTM A533B and A508 Cl.2 obtained in connection with a programme initiated to gather and create information needed for the assessment of the structural integrity of the reactor pressure vessels. The tensile properties were studied between -196 and 300 degC varying austenitizing and tempering temperatures and having two different carbon contents for the heats of A533B. (author)

  2. Mechanical properties of ASTM A508 Class 4 steel used in the LWBR closure head and support flange (LWBR Development Program)

    International Nuclear Information System (INIS)

    Allen, R.M.; Hall, J.F.

    1978-07-01

    The LWBR closure head and support flange are manufactured from forgings of ASTM A508 Class 4 steel rather than the ASTM A508 Class 2 forging material more commonly used in reactor vessels and closure heads. Forgings involved were approximately 300,000 pounds and 46,000 pounds. The extensive material test program conducted on ASTM A508 Class 4 LWBR forgings is described. The results of the tests confirm that the A508 Class 4 material used for the LWBR forgings has been quite good through thickness, fracture toughness, and strength properties and fully meet all specified requirements

  3. Caracterização microestrutural de soldas dissimilares dos aços ASTM A-508 e AISI 316L Characterization of dissimilar metal weld between low alloy steel ASTM A-508 and 316L stainless steel

    Directory of Open Access Journals (Sweden)

    Luciana Iglésias Lourenço Lima

    2010-06-01

    Full Text Available As soldas dissimilares (dissimilar metal welds - DMWs são utilizadas em diversos segmentos da indústria. No caso específico de usinas nucleares, tais soldas são necessárias para conectar tubulações de aço inoxidável com componentes fabricados em aços baixa liga. Os materiais de adição mais utilizados neste tipo de solda são as ligas de níquel 82 e 182. Este trabalho consistiu na soldagem de uma junta dissimilar de aço baixa liga ASTM A-508 G3 e aço inoxidável austenítico AISI 316L utilizando as ligas de níquel 82 e 182 como metais de adição. A soldagem foi realizada manualmente empregando os processos de soldagem ao arco SMAW (Shielded Metal Arc Welding e GTAW (Gas Tungsten Arc Welding. Os corpos de prova foram caracterizados microestruturalmente utilizando-se microscópio óptico e microscópio eletrônico de varredura com microanálise por dispersão de energia de raios X (EDS e ensaios de microdureza Vickers. Observou-se uma microestrutura constituída de dendritas de austenita com a presença de precipitados com formas e dimensões definidas pelo aporte térmico e pela direção de soldagem. Não houve variação significativa da dureza ao longo da junta soldada, demonstrando a adequação dos parâmetros de soldagem utilizados.The dissimilar metal welds (DMWs are used in several areas of the industries. In the nuclear power plant, this weld using nickel alloy welding wires is used to connect stainless steel pipes to low alloy steel components on the reactor pressured vessels. The filler materials commonly used in this type of weld are nickel alloys 82 and 182.. In this study, dissimilar metal welds composed of low alloy steel ASTM A-508 G3, nickel alloys 82 e 182 as weld metals, and austenitic stainless steel AISI 316L were prepared by manual shielded metal arc welding (SMAW and gas tungsten arc welding techniques (GTAW. Samples were microstructural characterized by optical microscopy and scanning electron microscopy

  4. Determination of crack arrest toughness in A508 CL.3 forging steel from ASTM E1221-88 procedure. Comparison with the values obtained from thermal loading tests

    International Nuclear Information System (INIS)

    Frund, J.M.; Difant, M.; Bethmont, M.

    1994-01-01

    A crack arrest study is under way at Electricite de France as part of the analysis of the risk of fast fracture of PWR vessels in emergency conditions. The first objective of this study is to evaluate the toughness which characterizes crack arrest through tests on reduced-size specimens. Some of the tests on a forging steel (A508 Cl.3) were conducted in conformity with two experimental methods. One method recommended by the ASTM calls for the use of an imposed-displacement mechanical loading on specimens kept under homogeneous temperature. Since the stress intensity factor K applied to the outside loading decreases along the crack growth, we can observe the arrest of the crack. In order to obtain brittle crack initiations in cleavage in the whole studied range of temperature and crack propagation of a sufficient length, the application of a weld point at the top of the notch is done. The other experimental method is based on a thermal loading. It requires the use of a disk or a cylinder with a longitudinal initial crack of the external surface. We dip this specimen in liquid nitrogen and we heat its internal surface with inducing current. There is a temperature gradient in the thickness of the specimen which produces a stress field which tends to open the crack. When the value of K is reached the crack initiation takes place. Several phenomena act to oppose the crack growth, they even go as far as stopping it. First the value of K, after increasing, gets steady then decreases, then, the rate of energy dissipated by plasticity at the top of the crack increases because the crack meets warmer and warmer areas on its way. The arrest toughness values which were obtained were then analyzed and compared to one another and with values proposed by RCC-m code. (authors). 12 refs., 11 figs., 3 tabs

  5. Effect of long term thermal ageing on the mechanical properties of ASTM A533B and A508 steels in the quenched and tempered and simulated heat affected zone conditions

    Energy Technology Data Exchange (ETDEWEB)

    Druce, S.G.; Gage, G.; Jordan, G.

    1985-04-01

    Manganese-molybdenum-nickel steels are used commonly in the fabrication of critical components in the PWR primary circuit operating at temperatures up to 345 C for periods up to several hundred thousand hours. Demonstration of structural integrity throughout service life requires quantification of the effects of thermal ageing on mechanical properties. Thermal ageing in the temperature range 300 to 550 C for durations up to 2000 h was studied in quenched and tempered A533B plate and simulated heat-affected-zone (HAZ) microstructures in A533B and A508 materials. A combination of tensile, hardness and Charpy impact tests were used to assess changes in rheological and toughness related properties. Quantitative fractography and Auger spectroscopy were used to characterize associated changes in fracture mode and grain boundary composition.

  6. Pioneer ACO PUF

    Data.gov (United States)

    U.S. Department of Health & Human Services — Pioneer ACO PUF - To address the increasing number of requests for Pioneer ACO data, the Centers for Medicare and Medicaid Services (CMS) has created a standard...

  7. Pioneer ACO Model

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Pioneer ACO Model is designed for health care organizations and providers that are already experienced in coordinating care for patients across care settings. It...

  8. Results of crack-arrest tests on irradiated a 508 class 3 steel

    International Nuclear Information System (INIS)

    Iskander, S.K.; Milella, P.P.; Pini, M.A.

    1998-02-01

    Ten crack-arrest toughness values for irradiated specimens of A 508 class 3 forging steel have been obtained. The tests were performed according to the American Society for Testing and Materials (ASTM) Standard Test Method for Determining Plane-Strain Crack-Arrest Fracture Toughness, K la of Ferritic Steels, E 1221-88. None of these values are strictly valid in all five ASTM E 1221-88 validity criteria. However, they are useful when compared to unirradiated crack-arrest specimen toughness values since they show the small (averaging approximately 10 degrees C) shifts in the mean and lower-bound crack-arrest toughness curves. This confirms that a low copper content in ASTM A 508 class 3 forging material can be expected to result in small shifts of the transition toughness curve. The shifts due to neutron irradiation of the lower bound and mean toughness curves are approximately the same as the Charpy V-notch (CVN) 41-J temperature shift. The nine crack-arrest specimens were irradiated at temperatures varying from 243 to 280 degrees C, and to a fluence varying from 1.7 to 2.7 x 10 19 neutrons/cm 2 (> 1 MeV). The test results were normalized to reference values that correspond to those of CVN specimens irradiated at 284 degrees C to a fluence of 3.2 x 10 19 neutrons/cm 2 (> 1 MeV) in the same capsule as the crack-arrest specimens. This adjustment resulted in a shift to lower temperatures of all the data, and in particular moved two data points that appeared to lie close to or lower than the American Society of Mechanical Engineers K la curve to positions that seemed more reasonable with respect to the remaining data. A special fixture was designed, fabricated, and successfully used in the testing. For reasons explained in the text, special blocks to receive the Oak Ridge National Laboratory clip gage were designed, and greater-than-standard crack-mouth opening displacements measured were accounted for. 24 refs., 13 figs., 12 tabs

  9. Financial Performance of Rural Medicare ACOs.

    Science.gov (United States)

    Nattinger, Matthew C; Mueller, Keith; Ullrich, Fred; Zhu, Xi

    2018-12-01

    The Centers for Medicare & Medicaid Services (CMS) has facilitated the development of Medicare accountable care organizations (ACOs), mostly through the Medicare Shared Savings Program (MSSP). To inform the operation of the Center for Medicare & Medicaid Innovation's (CMMI) ACO programs, we assess the financial performance of rural ACOs based on different levels of rural presence. We used the 2014 performance data for Medicare ACOs to examine the financial performance of rural ACOs with different levels of rural presence: exclusively rural, mostly rural, and mixed rural/metropolitan. Of the ACOs reporting performance data, we identified 97 ACOs with a measurable rural presence. We found that successful rural ACO financial performance is associated with the ACO's organizational type (eg, physician-based) and that 8 of the 11 rural ACOs participating in the Advanced Payment Program (APP) garnered savings for Medicare. Unlike previous work, we did not find an association between ACO size or experience and rural ACO financial performance. Our findings suggest that rural ACO financial success is likely associated with factors unique to rural environments. Given the emphasis CMS has placed on rural ACO development, further research to identify these factors is warranted. © 2016 National Rural Health Association.

  10. 47 CFR 90.379 - ASTM E2213-03 DSRC Standard (ASTM-DSRC Standard).

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false ASTM E2213-03 DSRC Standard (ASTM-DSRC Standard... Communications Service (dsrcs) § 90.379 ASTM E2213-03 DSRC Standard (ASTM-DSRC Standard). Roadside Units... incorporated by reference: American Society for Testing and Materials (ASTM) E2213-03, “Standard Specification...

  11. Comparison of ASTM D613 and ASTM D6890

    Science.gov (United States)

    2016-04-01

    cetane values outside of the routine range of traditional CN testing by ASTM D613, this is an important advantage in fuel blending and disposition...Number testing. Particular emphasis was placed on evaluating fuels, and blends thereof, having cetane values outside of the normal range of the...interest covers both petroleum-based and synthetic-based, as well as blends thereof in order to improve the confidence in using DCN as a replacement

  12. Feocromocitoma cardíaco

    Directory of Open Access Journals (Sweden)

    Gustavo L. Knop

    2006-01-01

    Full Text Available Los feocromocitomas cardíacos primarios (FCP son sumamente infrecuentes. Hasta el presente son menos de 50 los casos comunicados en el mundo. Presentamos el caso de un tumor intrapericárdico, que resultó ser un feocromocitoma primario, en una mujer de mediana edad, cuyo signo principal fue hipertensión arterial severa (HTAs. Los estudios diagnósticos por imágenes corroboraron la presencia de un tumor intrapericárdico como único hallazgo y los estudios bioquímicos de catecolaminas y sus metabolitos excretados por orina reafirmaron el diagnóstico etiológico. El tumor fue resecado quirúrgicamente sin complicaciones mediante cirugía cardíaca convencional con circulación extracorpórea (CEC y paro cardíaco con cardioplejía. Siete meses después de la operación, la paciente se encuentra asintomática y normotensa.

  13. Creep of A508/533 Pressure Vessel Steel

    Energy Technology Data Exchange (ETDEWEB)

    Richard Wright

    2014-08-01

    ABSTRACT Evaluation of potential Reactor Pressure Vessel (RPV) steels has been carried out as part of the pre-conceptual Very High Temperature Reactor (VHTR) design studies. These design studies have generally focused on American Society of Mechanical Engineers (ASME) Code status of the steels, temperature limits, and allowable stresses. Initially, three candidate materials were identified by this process: conventional light water reactor (LWR) RPV steels A508 and A533, 2¼Cr-1Mo in the annealed condition, and Grade 91 steel. The low strength of 2¼Cr-1Mo at elevated temperature has eliminated this steel from serious consideration as the VHTR RPV candidate material. Discussions with the very few vendors that can potentially produce large forgings for nuclear pressure vessels indicate a strong preference for conventional LWR steels. This preference is based in part on extensive experience with forging these steels for nuclear components. It is also based on the inability to cast large ingots of the Grade 91 steel due to segregation during ingot solidification, thus restricting the possible mass of forging components and increasing the amount of welding required for completion of the RPV. Grade 91 steel is also prone to weld cracking and must be post-weld heat treated to ensure adequate high-temperature strength. There are also questions about the ability to produce, and very importantly, verify the through thickness properties of thick sections of Grade 91 material. The availability of large components, ease of fabrication, and nuclear service experience with the A508 and A533 steels strongly favor their use in the RPV for the VHTR. Lowering the gas outlet temperature for the VHTR to 750°C from 950 to 1000°C, proposed in early concept studies, further strengthens the justification for this material selection. This steel is allowed in the ASME Boiler and Pressure Vessel Code for nuclear service up to 371°C (700°F); certain excursions above that temperature are

  14. ACO model should encourage efficient care delivery.

    Science.gov (United States)

    Toussaint, John; Krueger, David; Shortell, Stephen M; Milstein, Arnold; Cutler, David M

    2015-09-01

    The independent Office of the Actuary for CMS certified that the Pioneer ACO model has met the stringent criteria for expansion to a larger population. Significant savings have accrued and quality targets have been met, so the program as a whole appears to be working. Ironically, 13 of the initial 32 enrollees have left. We attribute this to the design of the ACO models which inadequately support efficient care delivery. Using Bellin-ThedaCare Healthcare Partners as an example, we will focus on correctible flaws in four core elements of the ACO payment model: finance spending and targets, attribution, and quality performance. Copyright © 2015 Elsevier Inc. All rights reserved.

  15. ASTM reference radiologic digital image standards

    International Nuclear Information System (INIS)

    Wysnewski, R.; Wysnewski, D.

    1996-01-01

    ASTM Reference Radiographs have been essential in defining industry's material defect grade levels for many years. ASTM Reference Radiographs are used extensively as even the American Society for Metals Nondestructive Inspection and Quality Control Metals Handbook, Volume 11, eighth edition refers to ASTM Standard Reference Radiographs. The recently published E 1648 Standard Reference Radiographs for Examination of Aluminum Fusion Welds is a prime example of the on-going need for these references. To date, 14 Standard Reference Radiographs have been published to characterize material defects. Standard Reference Radiographs do not adequately address film-less radiologic methods. There are differences in mediums to content with. On a computer CRT defect indications appear differently when compared to indications viewed in a radiograph on a view box. Industry that uses non-film radiologic methods of inspection can be burdened with additional time and money developing internal standard reference radiologic images. These references may be deemed necessary for grading levels of product defects. Because there are no ASTM Standard Reference Radiologic data files for addressing this need in the industry, the authors of this paper suggested implementing a method for their creation under ASTM supervision. ASTM can assure continuity to those users making the transition from analog radiographic images to digital image data by swiftly addressing the requirements for reference digital image standards. The current status and possible future activities regarding a method to create digital data files is presented in this paper summary

  16. Super ACO FEL oscillation at 300 nm

    CERN Document Server

    Nutarelli, D; Renault, E; Nahon, L; Couprie, Marie Emmanuelle

    2000-01-01

    Some recent improvements, involving both the optical cavity mirrors and the positron beam dynamics in the storage ring, have allowed us to achieve a laser oscillation at 300 nm on the Super ACO Storage Ring FEL. The Super ACO storage ring is operated at 800 MeV which is the nominal energy for the usual synchrotron radiation users, and the highest energy for a storage ring FEL. The lasing at 300 nm could be kept during 2 h per injection, with a stored current ranging between 30 and 60 mA. The FEL characteristics are presented here. The longitudinal stability and the FEL optics behaviour are also discussed.

  17. 46 CFR 163.003-3 - ASTM standard.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 6 2010-10-01 2010-10-01 false ASTM standard. 163.003-3 Section 163.003-3 Shipping...: SPECIFICATIONS AND APPROVAL CONSTRUCTION Pilot Ladder § 163.003-3 ASTM standard. The following standard of the American Society for Testing and Materials (ASTM) is incorporated by reference into this subpart: ASTM D...

  18. Tumores cardíacos primarios

    Directory of Open Access Journals (Sweden)

    Rosa Eugenia Díaz Garriga

    2013-10-01

    Full Text Available Introducción: los tumores cardíacos primarios son aquellos que se originan en Miocardio o Pericardio. El 90% son benignos, no son invasivos, pero debido a su localización pueden provocar alteraciones hemodinámicas graves y arrítmias. Presentación del caso: dos casos portadores de tumores cardíacos diagnosticados en la etapa prenatal, una gestante de 32 años, portadora de una Neurofribromatosis que en la ecocardiografía fetal de su hijo, se identifican dos tipos de tumores cardíacos, un mixoma auricular y un fibroma, y un niño que desde la etapa prenatal se diagnosticó un rabdomioma, lo cual se confirmó al nacimiento y que regresó espontáneamente. Conclusiones: a ecocardiografía fetal permite cada vez con más frecuencia, el diagnóstico intraútero de tumores cardíacos. Los rabdomiomas regresan en más del 50% de los casos, pero pueden ser un marcador de Esclerosis Tuberosa. Los tumores cardiacos se asocian a otras afecciones congénitas y requieren de tratamiento quirúrgico. Aspectos todos a tener en consideración para realizar el asesoramiento genético a la familia.

  19. ASTM Validates Air Pollution Test Methods

    Science.gov (United States)

    Chemical and Engineering News, 1973

    1973-01-01

    The American Society for Testing and Materials (ASTM) has validated six basic methods for measuring pollutants in ambient air as the first part of its Project Threshold. Aim of the project is to establish nationwide consistency in measuring pollutants; determining precision, accuracy and reproducibility of 35 standard measuring methods. (BL)

  20. Organizational Attributes Associated With Medicare ACO Quality Performance.

    Science.gov (United States)

    Zhu, Xi; Mueller, Keith; Huang, Huang; Ullrich, Fred; Vaughn, Thomas; MacKinney, A Clinton

    2018-05-08

    To evaluate associations between geographic, structural, and service-provision attributes of Accountable Care Organizations (ACOs) participating in the Medicare Shared Savings Program (MSSP) and the ACOs' quality performance. We conducted cross-sectional and longitudinal analyses of ACO quality performance using data from the Centers for Medicare and Medicaid Services and additional sources. The sample included 322 and 385 MSSP ACOs that had successfully reported quality measures in 2014 and 2015, respectively. Results show that after adjusting for other organizational factors, rural ACOs' average quality score was comparable to that of ACOs serving other geographic categories. ACOs with hospital-system sponsorship, larger beneficiary panels, and higher posthospitalization follow-up rates achieved better quality performance. There is no significant difference in average quality performance between rural ACOs and other ACOs after adjusting for structural and service-provision factors. MSSP ACO quality performance is positively associated with hospital-system sponsorship, beneficiary panel size, and posthospitalization follow-up rate. © 2018 National Rural Health Association.

  1. Unveiling the unicorn: a leader's guide to ACO preparation.

    Science.gov (United States)

    Aslin, Paul

    2011-01-01

    The great uncertainty surrounding healthcare reform provides little incentive for action. However, as healthcare leaders wait for final rules and clarity about accountable care organizations (ACOs), inaction is the inappropriate response. Several central themes emerge from research about beginning the ACO process. Leaders should be able to understand and articulate ACO concepts. They should champion embracing cultural change while partnering with physicians. Inventory of skills and capabilities should take place to understand any deficiencies required to implement an ACO. Finally, a plan should be formed by asking strategic questions on each platform needed to ensure performance and strategic goals are at the forefront of decisions regarding structure and function of an ACO. It takes a visionary leader to accept these challenges.

  2. Strain ageing of nuclear pressure vessel steels A533B and A508 cl.2

    International Nuclear Information System (INIS)

    Pelli, R.; Toerroenen, K.

    1978-04-01

    The susceptibility of the reactor pressure vessel steels A533B and A508 cl.2 to strain ageing has been studied using conventional tensile and impact testing of prestrained and aged specimens. The results show a modest susceptibility, seen as an increase in yield strength and Charpy V transition temperatures. The effect of varying alloying additions within the range of normal production was not observed, but the initial mechanical properties clearly affect the strain ageing. The lower the initial yield strength, the higher increase in strength and the lower increase in transition temperature is observed. (author)

  3. ALOHA Cabled Observatory (ACO): Acoustic Doppler Current Profiler (ADCP): Velocity

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The University of Hawaii's ALOHA ("A Long-term Oligotrophic Habitat Assessment") Cabled Observatory (ACO) is located 100 km north of the island of Oahu, Hawaii (22...

  4. Annual Book of ASTM Standards, Part 23: Water; Atmospheric Analysis.

    Science.gov (United States)

    American Society for Testing and Materials, Philadelphia, PA.

    Standards for water and atmospheric analysis are compiled in this segment, Part 23, of the American Society for Testing and Materials (ASTM) annual book of standards. It contains all current formally approved ASTM standard and tentative test methods, definitions, recommended practices, proposed methods, classifications, and specifications. One…

  5. 78 FR 1884 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM...

    Science.gov (United States)

    2013-01-09

    ... Production Act of 1993--ASTM International Standards Notice is hereby given that, on December 12, 2012... seq. (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between...

  6. 76 FR 12370 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM...

    Science.gov (United States)

    2011-03-07

    ... Production Act of 1993--ASTM International Standards Notice is hereby given that, on February 4, 2011... seq. (``the Act''), ASTM International Standards (``ASTM'') has filed written notifications.... Specifically, ASTM has provided an updated list of current, ongoing ASTM standards activities originating...

  7. 78 FR 35646 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM...

    Science.gov (United States)

    2013-06-13

    ... Production Act of 1993--ASTM International Standards Notice is hereby given that, on May 10, 2013, pursuant... seq. (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between...

  8. 77 FR 34069 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM...

    Science.gov (United States)

    2012-06-08

    ... Production Act of 1993--ASTM International Standards Notice is hereby given that, on May 11, 2012, pursuant... seq. (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between...

  9. 77 FR 61786 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM...

    Science.gov (United States)

    2012-10-11

    ... Production Act of 1993--ASTM International Standards Notice is hereby given that, on September 10, 2012... seq. (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between May...

  10. 78 FR 64248 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM...

    Science.gov (United States)

    2013-10-28

    ... Production Act of 1993--ASTM International Standards Notice is hereby given that, on September 16, 2013... seq. (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between May...

  11. 76 FR 34252 - Notice Pursuant to the National Cooperative Research and Production Act of 1993; ASTM...

    Science.gov (United States)

    2011-06-13

    ... Production Act of 1993; ASTM International Standards Notice is hereby given that, on May 11, 2011, pursuant... seq. (``the Act''), ASTM International Standards (``ASTM'') has filed written notifications.... Specifically, ASTM has provided an updated list of current, ongoing ASTM standards activities originating...

  12. 78 FR 14836 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM...

    Science.gov (United States)

    2013-03-07

    ... Production Act of 1993--ASTM International Standards Notice is hereby given that, on February 11, 2013... seq. (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between...

  13. Paro Cardíaco en el Embarazo

    OpenAIRE

    Manuel Eduardo Sáenz Madrigal; Carlos Adrián Vindas Morera

    2013-01-01

    El paro cardíaco en el embarazo presenta un escenario único en el que están incluidos dos pacientes: la madre y el feto. El manejo de este escenario requiere de un equipo multidisciplinario incluyendo especialistas en anestesia, obstetricia, neonatología, cardiología y en ocasiones cirugía cardíaca. Los protocolos de soporte vital básico y soporte cardíaco avanzado deben ser implementados, sin embargo, dados los cambios anatómicos y fisiológicos que ocurren en el embarazo, algunas modificacio...

  14. Spectrophotometric determination of the ASTM color of diesel oil

    Energy Technology Data Exchange (ETDEWEB)

    Douglas Willian Emanuel Alves Santana; Marcelle Prates Sepulveda; Paulo Jorge Sanches Barbeira

    2007-03-15

    One of the parameters analyzed to determine the quality of diesel oil is its ASTM color. Changes in color may be indicative of problems in the production process, contamination, degradation or the oxidation of diesel. The methodology recommended for determining the color of automotive diesel oil samples is the colorimetry according to standard ASTM D1500, in which a sample is introduced into a glass cell and the color of the sample is compared with an optical filter color scale. Although it is very simple, the manual method requires good visual acuity from the operator. This procedure becomes somewhat subjective in some cases since different operators can make distinct evaluations of the same sample. In this way, this work proposes the development of a spectrophotometric analysis methodology to eliminate the subjectiveness in the determination of ASTM color of diesel oil samples by using operator-independent parameters and making quality assay more accurate and precise. Short communication. 7 refs., 2 figs., 2 tabs.

  15. ASTM Standards for Reactor Dosimetry and Pressure Vessel Surveillance

    International Nuclear Information System (INIS)

    GRIFFIN, PATRICK J.

    1999-01-01

    The ASTM standards provide guidance and instruction on how to field and interpret reactor dosimetry. They provide a roadmap towards understanding the current ''state-of-the-art'' in reactor dosimetry, as reflected by the technical community. The consensus basis to the ASTM standards assures the user of an unbiased presentation of technical procedures and interpretations of the measurements. Some insight into the types of standards and the way in which they are organized can assist one in using them in an expeditious manner. Two example are presented to help orient new users to the breadth and interrelationship between the ASTM nuclear metrology standards. One example involves the testing of a new ''widget'' to verify the radiation hardness. The second example involves quantifying the radiation damage at a pressure vessel critical weld location through surveillance dosimetry and calculation

  16. Use of ASTM D5304 in assessing unstable diesel fuel

    Energy Technology Data Exchange (ETDEWEB)

    Turner, L.M.; Martin, C.J. [Defense Fuel Supply Center, Alexandria, VA (United States); Beal, E.J.; Hardy, D.R. [Naval Research Lab., Washington, DC (United States)

    1995-05-01

    The storage stability, or the length of time a fuel can be stored, is of great concern to diesel fuel users. This paper reports on the use of the new ASTM accelerated test for storage stability by oxygen overpressure (D5304) to predict future storage life span of 63,000,000 gallons of a diesel fuel for US Naval vessel use. This paper demonstrates the use of ASTM D5304 at storage times of 16, 40 and 96 hours to accurately determine the length of time that this large quantity of diesel fuel could be stored at ambient temperatures before the maximum allowable amount of particulate contamination was reached.

  17. Characterization of ASTM round-robin tungsten-powder samples

    International Nuclear Information System (INIS)

    Slettevold, C.A.; Biermann, A.H.

    1975-01-01

    The Lawrence Livermore Laboratory Particle Characterization Laboratory Group has participated in an industry-wide round-robin investigation on characterization of tungsten powder. sponsored by the ASTM Subcommittee on Refractory-Metal Powders (B-09.3). The analyses performed at the suggestion of the ASTM subcommittee included measurements of tap density, apparent density, true density, average particle size, and surface area. Determinations of particle-weight and size distributions were also performed and particle inspection conducted by microscopy. This report describes the equipment and procedures used and summarizes the results of these analyses. (9 tables, 17 fig) (U.S.)

  18. HACCP: Integrating Science and Management through ASTM Standards

    Science.gov (United States)

    From a technical perspective, hazard analysis-critical control point (HACCP) evaluation may be considered a risk management tool suited to a wide range of applications. As one outcome of a symposium convened by American Society for Testing and Materials (ASTM) in August, 2005, th...

  19. 178. Linfoma cardíaco. Una neoplasia infrecuente

    Directory of Open Access Journals (Sweden)

    E. Sandoval

    2010-01-01

    Conclusiones: Los linfomas cardíacos son de alto grado de agresividad. La localización principal es la aurícula derecha, con clínica inespecífica y variable. No existe claro consenso sobre el tratamiento de elección, pero parece haber mayor supervivencia con tratamiento combinado con quimioterapia con antraciclínicos y radioterapia.

  20. 75 FR 11196 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM International

    Science.gov (United States)

    2010-03-10

    ... Production Act of 1993--ASTM International Notice is hereby given that, on February 16, 2010, pursuant to.... (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with the..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between May...

  1. 75 FR 65657 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM International

    Science.gov (United States)

    2010-10-26

    ... Production Act of 1993--ASTM International Notice is hereby given that, on September 23, 2010, pursuant to.... (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with the..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between May...

  2. 77 FR 14046 - Amended Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM...

    Science.gov (United States)

    2012-03-08

    ... Research and Production Act of 1993--ASTM International Standards Notice is hereby given that, on February..., 15 U.S.C. 4301 et seq. (``the Act''), ASTM International Standards (``ASTM'') has filed written... circumstances. Specifically, ASTM has provided an updated list of current, ongoing ASTM standards activities...

  3. 76 FR 63658 - Notice Pursuant to the National Cooperative Research and Production Act of 1993; ASTM International

    Science.gov (United States)

    2011-10-13

    ... Production Act of 1993; ASTM International Notice is hereby given that, on August 31, 2011, pursuant to.... (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with the..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between May...

  4. 77 FR 1085 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM International

    Science.gov (United States)

    2012-01-09

    ... Production Act of 1993--ASTM International Notice is hereby given that, on December 5, 2011, pursuant to.... (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with the..., ASTM has provided an updated list of current, ongoing ASTM standards activities originating between...

  5. Determinants of success in Shared Savings Programs: An analysis of ACO and market characteristics.

    Science.gov (United States)

    Ouayogodé, Mariétou H; Colla, Carrie H; Lewis, Valerie A

    2017-03-01

    Medicare's Accountable Care Organization (ACO) programs introduced shared savings to traditional Medicare, which allow providers who reduce health care costs for their patients to retain a percentage of the savings they generate. To examine ACO and market factors associated with superior financial performance in Medicare ACO programs. We obtained financial performance data from the Centers for Medicare and Medicaid Services (CMS); we derived market-level characteristics from Medicare claims; and we collected ACO characteristics from the National Survey of ACOs for 215 ACOs. We examined the association between ACO financial performance and ACO provider composition, leadership structure, beneficiary characteristics, risk bearing experience, quality and process improvement capabilities, physician performance management, market competition, CMS-assigned financial benchmark, and ACO contract start date. We examined two outcomes from Medicare ACOs' first performance year: savings per Medicare beneficiary and earning shared savings payments (a dichotomous variable). When modeling the ACO ability to save and earn shared savings payments, we estimated positive regression coefficients for a greater proportion of primary care providers in the ACO, more practicing physicians on the governing board, physician leadership, active engagement in reducing hospital re-admissions, a greater proportion of disabled Medicare beneficiaries assigned to the ACO, financial incentives offered to physicians, a larger financial benchmark, and greater ACO market penetration. No characteristic of organizational structure was significantly associated with both outcomes of savings per beneficiary and likelihood of achieving shared savings. ACO prior experience with risk-bearing contracts was positively correlated with savings and significantly increased the likelihood of receiving shared savings payments. In the first year, performance is quite heterogeneous, yet organizational structure does not

  6. 76 FR 1459 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM International

    Science.gov (United States)

    2011-01-10

    ... Production Act of 1993-ASTM International Notice is hereby given that, on December 6, 2010, pursuant to.... (``the Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with the...

  7. 47 CFR 95.1509 - ASTM E2213-03 DSRC Standard.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false ASTM E2213-03 DSRC Standard. 95.1509 Section 95... ASTM E2213-03 DSRC Standard. On-Board Units operating in the 5850-5925 MHz band shall comply with the... Materials (ASTM) E2213-03, Standard Specification for Telecommunications and Information Exchange Between...

  8. Verification of the ASTM G-124 Purge Equation

    Science.gov (United States)

    Robbins, Katherine E.; Davis, Samuel Eddie

    2009-01-01

    ASTM G-124 seeks to evaluate combustion characteristics of metals in high-purity (greater than 99%) oxygen atmospheres. ASTM G-124 provides the following equation to determine the minimum number of purges required to reach this level of purity in a test chamber: n = -4/log10(Pa/Ph), where "n" is the total number of purge cycles required, Ph is the absolute pressure used for the purge on each cycle and Pa is the atmospheric pressure or the vent pressure. The origin of this equation is not known and has been the source of frequent questions as to its accuracy and reliability. This paper shows the derivation of the G-124 purge equation, and experimentally explores the equation to determine if it accurately predicts the number of cycles required.

  9. Isothermal Bainite Processing of ASTM A723 Components

    Science.gov (United States)

    1993-09-01

    4 List of Illustrations 1. Photograph of typical cylinders used in the present study ................................. 7 2. CCT diagram for... CCT ) diagram obtained by thermal and magnetic analyses for the high nickel (-3 percent) ASTM A723 steel. The bainite knee for the 2 percent nickel...block. Also shown is the slope giving the average cooling rate in the critical region of the CCT diagram . This average rate happens to approximately

  10. An Automated Safe-to-Mate (ASTM) Tester

    Science.gov (United States)

    Nguyen, Phuc; Scott, Michelle; Leung, Alan; Lin, Michael; Johnson, Thomas

    2013-01-01

    Safe-to-mate testing is a common hardware safety practice where impedance measurements are made on unpowered hardware to verify isolation, continuity, or impedance between pins of an interface connector. A computer-based instrumentation solution has been developed to resolve issues. The ASTM is connected to the circuit under test, and can then quickly, safely, and reliably safe-to-mate the entire connector, or even multiple connectors, at the same time.

  11. The USCG/environment Canada/ASTM standards development program

    International Nuclear Information System (INIS)

    Whittaker, H.

    1992-01-01

    Environment Canada's Emergencies Engineering Division (EED) has been charged, as a result of the Public Review Panel on Tanker Safety and Marine Emergency Response report, with increased R ampersand D in marine oil spills. This activity will, of necessity, include development of standards and guidelines for the testing and/or usage of oil spill cleanup equipment. The United States Coast Guard (USCG) has been charged with implementing the provisions of the Oil Pollution Act of 1990 (OPA-90), as it pertains to marine transportation vessels and facilities. Among the provisions are requirements for vessel and facility owners and operators to develop comprehensive response plans that specifically match response resources to spill removal requirements. Meeting the response plan provisions of OPA-90 requires common standards for testing, selecting and assigning resources to anticipated response needs and objectively evaluating response plans for adequacy. In August of 1991, the USCG OPA-90 office approached ASTM to determine the feasibility of developing standards through that organizations procedures. Meetings were then held between the OPA-90 staff and members of the ASTM Committee F-20 on Hazardous Substances and Oil Spill Response. An agreement was reached to commence standards development in the areas of: Barriers, Skimmers, Treating Agents, Pumps, Beach Clean-up, Sorbents, Bioremediation, In-situ Burning, Temporary Storage Devices, Communications, Remote Sensing. It was recognized that ASTM and other organizational standards existed in several of these areas, but there were those where none were known to exist. Standards development was, therefore, expected to be a complicated and time-consuming process. Both the USCG OPA-90 and EC/EED offices required standards to be developed quickly, without subverting the ASTM process. Mechanical containment and recovery was considered to be the primary area of concern for both groups

  12. Effects of strength mis-matching on the fracture behavior of nuclear pressure steel A508-III welded joint

    Energy Technology Data Exchange (ETDEWEB)

    Zhu Zhengqiang [School of Material Science and Technology, Shanghai Jiaotong University, 1954 Huashan Road, Shanghai 200030 (China)]. E-mail: zhuzhq01@sjtu.edu.cn; Jing Hongyang [School of Material Science and Technology, Tianjin University, Tianjin 300072 (China); Ge Jingguo [School of Material Science and Technology, Shanghai Jiaotong University, 1954 Huashan Road, Shanghai 200030 (China); Chen Ligong [School of Material Science and Technology, Shanghai Jiaotong University, 1954 Huashan Road, Shanghai 200030 (China)

    2005-01-15

    In this paper, according to the nuclear pressure steel A508-III, the effect of strength mis-matching on the fracture behavior was analyzed by fracture mechanics test and the crack tip stress field of three-point bend specimen was analyzed by using finite element analysis method (FEM). The fracture of heat-affected zone (HAZ) was emphasized especially. The results of FEM show that if the under-matching weld was used, the opening stress and stress triaxiality in the vicinity of crack tip would increase for weld-crack specimen, and would reduce for HAZ-crack specimen. This tendency was confirmed by the test results.

  13. Free electron laser on the ACO storage ring

    International Nuclear Information System (INIS)

    Elleaume, P.

    1984-06-01

    This dissertation presents the design and characteristics of a Free Electron Laser built on the electron storage ring ACO at Orsay. The weak optical gain available (approximately 0.1% per pass) necessitated the use of an optical klystron instead of an undulator and the use of mirror with extremely high reflectivity. The laser characteristics: spectra, micro and macro-temporal structures, transverse structure and power are presented. They are in very good agreement with a classical theory based on the Lorentz force and Maxwell equations [fr

  14. MODELO ACO PARA LA RECOLECCIÓN DE RESIDUOS POR CONTENEDORES ACO MODEL APPLIED TO THE WASTE COLLECTION BY CONTAINERS

    Directory of Open Access Journals (Sweden)

    Eduardo Salazar Hornig

    2009-08-01

    Full Text Available ACO es una metaheurística inspirada en el comportamiento de las colonias de hormigas para solucionar problemas de optimización combinatoria, por medio de la utilización de agentes computacionales simples que trabajan de manera cooperativa y se comunican mediante rastros de feromona artificiales. En este trabajo se presenta un modelo para resolver el Problema de Recolección de Residuos Domiciliarios por Contenedores, el que aplica un concepto de secuencias parciales de recolección que deben ser unidas para minimizar la distancia total de recolección. El problema de unir las secuencias parciales se representa como un TSP, el que es resuelto mediante un algoritmo ACO. En base a recomendaciones de la literatura, se calibran experimentalmente los parámetros del algoritmo y se recomiendan rangos de valores que representan buenos rendimientos promedio. El modelo se aplica a un sector de recolección de la comuna de San Pedro de la Paz, Chile, obteniéndose rutas de recolección que reducen la distancia total recorrida respecto de la actual ruta utilizada y de la solución obtenida con otro modelo desarrollado previamente.ACO is a metaheuristic inspired in the behavior of natural ant colonies to solve combinatorial optimization problems, based on simple agents that work cooperatively communicating by artificial pheromone trails. In this paper a model to solve the municipal waste collection problem by containers is presented, which applies a concept of partial collection sequences that must be joined to minimize the total collection distance. The problem to join the partial collection sequences is represented as a TSP, which is solved by an ACO algorithm. Based on the literature, algorithm parameters are experimentally calibrated and range of variations that represents good average solutions are recommended. The model is applied to a waste collection sector of the San Pedro de la Paz commune in Chile, obtaining recollection routes with less total

  15. Structural effects of hydrogen action in the low alloy Mn-Ni-Mo (A508.3) steel

    International Nuclear Information System (INIS)

    Sozanska, M.; Maciejny, A.; Sojka, J.; Hyspecka, L.; Galland, J.

    1999-01-01

    The presented paper deals with the study of hydrogen embrittlement of A508.3 steel used in nuclear industry. The effects in hydrogen are investigated by means of tensile testes on hydrogen charged specimens. The degree of degradation of mechanical properties is the first and the most important criterion of susceptibility to hydrogen embrittlement. The second criterion represents changes in failure micro mechanisms provoked by presence of hydrogen in microstructure or in the surface fracture. For this steel, hydrogen provoked special defects called 'fish eyes' on surface fractures after tensile tests. 'Fish eyes' nucleated on course spherical non-metallic inclusions. Inclusions were identified in most cases as a complex oxides containing variable quantities namely Al, Mg, Si, and Ca, the outer shell being formed by (Ca, Mn)S. Special attention was given to the detailed metallographic analysis by means of light and scanning electron microscopy, including the methods of image analysis, local chemical analysis, quantitative metallography quantitative fractography. Metallographic methods are explained by nonmetallic inclusion morphology. Inclusions were evaluated by means of image analysis and the results obtained have shown inclusion content and their geometric characteristics. Fractographic methods are used in quantitative characteristic of different types of fracture surfaces (ductile, quasicleavage and 'fish eyes') and parameters of 'fish eyes' (their number per unit of fracture area, diameter, surface, shape). All results obtained in this way can be used to describe more precisely the specific mechanism of hydrogen embrittlement in A508.3 steel. (author)

  16. ENHANCED HYBRID PSO – ACO ALGORITHM FOR GRID SCHEDULING

    Directory of Open Access Journals (Sweden)

    P. Mathiyalagan

    2010-07-01

    Full Text Available Grid computing is a high performance computing environment to solve larger scale computational demands. Grid computing contains resource management, task scheduling, security problems, information management and so on. Task scheduling is a fundamental issue in achieving high performance in grid computing systems. A computational GRID is typically heterogeneous in the sense that it combines clusters of varying sizes, and different clusters typically contains processing elements with different level of performance. In this, heuristic approaches based on particle swarm optimization and ant colony optimization algorithms are adopted for solving task scheduling problems in grid environment. Particle Swarm Optimization (PSO is one of the latest evolutionary optimization techniques by nature. It has the better ability of global searching and has been successfully applied to many areas such as, neural network training etc. Due to the linear decreasing of inertia weight in PSO the convergence rate becomes faster, which leads to the minimal makespan time when used for scheduling. To make the convergence rate faster, the PSO algorithm is improved by modifying the inertia parameter, such that it produces better performance and gives an optimized result. The ACO algorithm is improved by modifying the pheromone updating rule. ACO algorithm is hybridized with PSO algorithm for efficient result and better convergence in PSO algorithm.

  17. Substantial Physician Turnover And Beneficiary 'Churn' In A Large Medicare Pioneer ACO.

    Science.gov (United States)

    Hsu, John; Vogeli, Christine; Price, Mary; Brand, Richard; Chernew, Michael E; Mohta, Namita; Chaguturu, Sreekanth K; Weil, Eric; Ferris, Timothy G

    2017-04-01

    Alternative payment models, such as accountable care organizations (ACOs), attempt to stimulate improvements in care delivery by better alignment of payer and provider incentives. However, limited attention has been paid to the physicians who actually deliver the care. In a large Medicare Pioneer ACO, we found that the number of beneficiaries per physician was low (median of seventy beneficiaries per physician, or less than 5 percent of a typical panel). We also found substantial physician turnover: More than half of physicians either joined (41 percent) or left (18 percent) the ACO during the 2012-14 contract period studied. When physicians left the ACO, most of their attributed beneficiaries also left the ACO. Conversely, about half of the growth in the beneficiary population was because of new physicians affiliating with the ACO; the remainder joined after switching physicians. These findings may help explain the muted financial impact ACOs have had overall, and they raise the possibility of future gaming on the part of ACOs to artificially control spending. Policy refinements include coordinated and standardized risk-sharing parameters across payers to prevent any dilution of the payment incentives or confusion from a cacophony of incentives across payers. Project HOPE—The People-to-People Health Foundation, Inc.

  18. The asthma-chronic obstructive pulmonary disease overlap syndrome (ACOS): opportunities and challenges.

    Science.gov (United States)

    Barrecheguren, Miriam; Esquinas, Cristina; Miravitlles, Marc

    2015-01-01

    Some individuals share characteristics of asthma and chronic obstructive pulmonary disease (COPD). The asthma-COPD overlap syndrome (ACOS) has been defined as symptoms of increased variability of airflow in association with an incompletely reversible airflow obstruction. In this review, we present the latest findings in the diagnosis, characterization and management of ACOS. Around 15-20% of COPD patients may have an ACOS. Patients with ACOS are characterized by increased reversibility of airflow obstruction, eosinophilic bronchial and systemic inflammation, and increased response to inhaled corticosteroids, compared with the remaining patients with COPD. Patients with ACOS have more frequent exacerbations, more wheezing and dyspnoea, but similar cough and sputum production compared with COPD. The relevance of the ACOS is to identify patients with COPD who may have underlying eosinophilic inflammation that responds to inhaled corticosteroids. So far, the previous diagnosis of asthma in a patient with COPD is the more reliable criterion for ACOS. Ongoing studies will clarify if concentrations of blood eosinophils may be useful to identify this subgroup of patients with COPD. If this is the case, the interest of ACOS may shift to that of eosinophilic COPD, which is easier to diagnose and has clear therapeutic implications.

  19. ASTM International Workshop on Standards & Measurements for Tissue Engineering Scaffolds

    Science.gov (United States)

    Simon, Carl G.; Yaszemski, Michael J.; Ratcliffe, Anthony; Tomlins, Paul; Luginbuehl, Reto; Tesk, John A.

    2016-01-01

    The “Workshop on Standards & Measurements for Tissue Engineering Scaffolds” was held on May 21, 2013 in Indianapolis, IN and was sponsored by the ASTM International (ASTM). The purpose of the workshop was to identify the highest priority items for future standards work for scaffolds used in the development and manufacture of tissue engineered medical products (TEMPs). Eighteen speakers and 78 attendees met to assess current scaffold standards and to prioritize needs for future standards. A key finding was that the ASTM TEMPs subcommittees (F04.41-46) have many active “guide” documents for educational purposes, but that few standard “test methods” or “practices” have been published. Overwhelmingly, the most clearly identified need was standards for measuring the structure of scaffolds, followed by standards for biological characterization, including in vitro testing, animal models and cell-material interactions. The third most pressing need was to develop standards for assessing the mechanical properties of scaffolds. Additional needs included standards for assessing scaffold degradation, clinical outcomes with scaffolds, effects of sterilization on scaffolds, scaffold composition and drug release from scaffolds. Discussions also highlighted the need for additional scaffold reference materials and the need to use them for measurement traceability. Finally, dialogue emphasized the needs to promote the use of standards in scaffold fabrication, characterization, and commercialization and to assess the use and impact of standards in the TEMPs community. Many scaffold standard needs have been identified and focus should now turn to generating these standards to support the use of scaffolds in TEMPs. PMID:25220952

  20. ASTM standards for fire debris analysis: a review.

    Science.gov (United States)

    Stauffer, Eric; Lentini, John J

    2003-03-12

    The American Society for Testing and Materials (ASTM) recently updated its standards E 1387 and E 1618 for the analysis of fire debris. The changes in the classification of ignitable liquids are presented in this review. Furthermore, a new standard on extraction of fire debris with solid phase microextraction (SPME) was released. Advantages and drawbacks of this technique are presented and discussed. Also, the standard on cleanup by acid stripping has not been reapproved. Fire debris analysts that use the standards should be aware of these changes.

  1. 75 FR 30440 - Notice Pursuant to the National Cooperative Research and Production Act of 1993-ASTM International

    Science.gov (United States)

    2010-06-01

    ... Production Act of 1993--ASTM International Notice is hereby given that, on May 6, 2010, pursuant to Section 6... Act''), ASTM International (``ASTM'') has filed written notifications simultaneously with the Attorney... recovery of antitrust plaintiffs to actual damages under specified circumstances. Specifically, ASTM has...

  2. Recommendations for fluorescence instrument qualification: the new ASTM Standard Guide.

    Science.gov (United States)

    DeRose, Paul C; Resch-Genger, Ute

    2010-03-01

    Aimed at improving quality assurance and quantitation for modern fluorescence techniques, ASTM International (ASTM) is about to release a Standard Guide for Fluorescence, reviewed here. The guide's main focus is on steady state fluorometry, for which available standards and instrument characterization procedures are discussed along with their purpose, suitability, and general instructions for use. These include the most relevant instrument properties needing qualification, such as linearity and spectral responsivity of the detection system, spectral irradiance reaching the sample, wavelength accuracy, sensitivity or limit of detection for an analyte, and day-to-day performance verification. With proper consideration of method-inherent requirements and limitations, many of these procedures and standards can be adapted to other fluorescence techniques. In addition, procedures for the determination of other relevant fluorometric quantities including fluorescence quantum yields and fluorescence lifetimes are briefly introduced. The guide is a clear and concise reference geared for users of fluorescence instrumentation at all levels of experience and is intended to aid in the ongoing standardization of fluorescence measurements.

  3. Overview (this manuscript is an overview of an ASTM ...

    Science.gov (United States)

    The Symposium on Developing Consensus Standards for Measuring Chemical Emissions from Spray Polyurethane Foam (SPF) Insulation was held on April 30th and May 1, 2015. Sponsored by ASTM Committee D22 on Air Quality, the symposium was held in Anaheim, CA, in conjunction with the standards development meetings of the Committee. ASTM D22.05 is developing tools to answer fundamental questions: what is emitted from SPF, how long do the emissions persist, how does ventilation impact concentrations and potential exposures? How can we model these processes to address the multiplicity of products, applications, and environmental conditions that may impact exposure to emissions over the life cycle of the material? These are complex and interrelated questions that have challenged the indoor environments research community for many years. Objectives of Symposium: Standardized methods are needed to assess the potential impacts of SPF insulation products on indoor air quality, establish re-entry times for trade workers or re-occupancy times for building occupants after product installation and to evaluate post-occupancy ventilation. The objective of the symposium was to provide a forum for the exchange of ideas from SPF manufacturers, regulatory agencies, indoor air quality professionals, testing labs, air quality consultants, instrument vendors and other stakeholders. Following the presentations on the current status of measuring emissions from SPF insulation, participants di

  4. Fracture toughness determination of the pressure vessel steel A508 Cl 2 between 100 and 350 degree C

    International Nuclear Information System (INIS)

    Rao, S.

    1980-09-01

    The fracture toughness of the pressure vessel steel A508 was determined in the temperature range 100 - 350 degree C. The J-integral method with crack growth resistance curves, the so-called R-curves, was used. The results show that the steel does not have an 'upper-shelf' and the fracture toughness, K sub (JC), decreases with increasing temperature to a minimum around 300 degree C and an increase above it. These results are compared to those obtained previously on an other pressure vessel steel A533B which has essentially the same temperature dependence. The results were also analysed using the Tearing modulus, T. The conclusion iw that the crack growth resistance and the crack initiation resistance (K sub (JC)) show a significant decrease around the operating temperatures as compared to 100 degree C. (author)

  5. Hospitals Participating In ACOs Tend To Be Large And Urban, Allowing Access To Capital And Data.

    Science.gov (United States)

    Colla, Carrie H; Lewis, Valerie A; Tierney, Emily; Muhlestein, David B

    2016-03-01

    Relationships between physicians and hospitals have changed considerably over the past decade, as hospitals and physician groups have integrated and new public and private payment policies have created financial interdependence. The extent to which accountable care organizations (ACOs) involve hospitals in their operations may prove to be vitally important, because managing hospital care is a key part of improving health care quality and lowering cost growth. Using primary data on ACO composition and capabilities paired with hospital characteristics, we found that 20 percent of US hospitals were part of an ACO in 2014. Hospitals that were in urban areas, were nonprofit, or had a smaller share of Medicare patients were more likely to participate in ACOs, compared to hospitals that were in more rural areas, were for-profit or government owned, or had a larger share of Medicare patients, respectively. Qualitative data identified the following advantages of including a hospital in an ACO: the availability of start-up capital, advanced data sharing, and engagement of providers across the care continuum. Although the 63 percent of ACOs that included hospitals offered more comprehensive services compared to ACOs without hospitals, we found no differences between the two groups in their ability to manage hospital-related aspects of patient care. Project HOPE—The People-to-People Health Foundation, Inc.

  6. Layered ACO-OFDM for intensity-modulated direct-detection optical wireless transmission.

    Science.gov (United States)

    Wang, Qi; Qian, Chen; Guo, Xuhan; Wang, Zhaocheng; Cunningham, David G; White, Ian H

    2015-05-04

    Layered asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) with high spectral efficiency is proposed in this paper for optical wireless transmission employing intensity modulation with direct detection. In contrast to the conventional ACO-OFDM, which only utilizes odd subcarriers for modulation, leading to an obvious spectral efficiency loss, in layered ACO-OFDM, the subcarriers are divided into different layers and modulated by different kinds of ACO-OFDM, which are combined for simultaneous transmission. In this way, more subcarriers are used for data transmission and the spectral efficiency is improved. An iterative receiver is also proposed for layered ACO-OFDM, where the negative clipping distortion of each layer is subtracted once it is detected so that the signals from different layers can be recovered. Theoretical analysis shows that the proposed scheme can improve the spectral efficiency by up to 2 times compared with conventional ACO-OFDM approaches with the same modulation order. Meanwhile, simulation results confirm a considerable signal-to-noise ratio gain over ACO-OFDM at the same spectral efficiency.

  7. Standard guide for high-resolution gamma-ray spectrometry of soil samples. ASTM standard

    International Nuclear Information System (INIS)

    1998-12-01

    This guide is under the jurisdiction of ASTM Committee C-26 on Nuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.05 on Methods of Test. The current edition was approved on Jul. 10, 1998. It was published in December 1998. Copyright American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA, 19428, USA. This document is available from NTIS under license from ASTM

  8. Method for Estimating Evaporative Potential (IM/CLO) from ASTM Standard Single Wind Velocity Measures

    Science.gov (United States)

    2016-08-10

    IM/CLO) FROM ASTM STANDARD SINGLE WIND VELOCITY MEASURES DISCLAIMER The opinions or assertions contained herein are the private views of the...USARIEM TECHNICAL REPORT T16-14 METHOD FOR ESTIMATING EVAPORATIVE POTENTIAL (IM/CLO) FROM ASTM STANDARD SINGLE WIND VELOCITY... ASTM STANDARD SINGLE WIND VELOCITY MEASURES Adam W. Potter Biophysics and Biomedical Modeling Division U.S. Army Research Institute of Environmental

  9. Evaluation of Instrumentation for Measuring Undissolved Water in Aviation Turbine Fuels per ASTM D3240

    Science.gov (United States)

    2015-11-05

    Undissolved Water in Aviation Turbine Fuels per ASTM D3240 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) Joel Schmitigal... water ) in Aviation Turbine Fuels per ASTM D3240 15. SUBJECT TERMS fuel, JP-8, aviation fuel, contamination, free water , undissolved water , Aqua-Glo 16...Michigan 48397-5000 Evaluation of Instrumentation for Measuring Undissolved Water in Aviation Turbine Fuels per ASTM D3240 Joel Schmitigal Force

  10. Modification of ASTM Standard E1681 on Environmental Cracking to Include Bolt-Load Specimen Testing

    National Research Council Canada - National Science Library

    Underwood, Jean D. M

    1997-01-01

    Benet Laboratories experience with environmental cracking of cannon components has been combined with the technical expertise of various participants at ASTM technical meetings and symposia to develop...

  11. Mobile Robot and Mobile Manipulator Research Towards ASTM Standards Development.

    Science.gov (United States)

    Bostelman, Roger; Hong, Tsai; Legowik, Steven

    2016-01-01

    Performance standards for industrial mobile robots and mobile manipulators (robot arms onboard mobile robots) have only recently begun development. Low cost and standardized measurement techniques are needed to characterize system performance, compare different systems, and to determine if recalibration is required. This paper discusses work at the National Institute of Standards and Technology (NIST) and within the ASTM Committee F45 on Driverless Automatic Guided Industrial Vehicles. This includes standards for both terminology, F45.91, and for navigation performance test methods, F45.02. The paper defines terms that are being considered. Additionally, the paper describes navigation test methods that are near ballot and docking test methods being designed for consideration within F45.02. This includes the use of low cost artifacts that can provide alternatives to using relatively expensive measurement systems.

  12. Interpreting the ASTM 'content standard for digital geospatial metadata'

    Science.gov (United States)

    Nebert, Douglas D.

    1996-01-01

    ASTM and the Federal Geographic Data Committee have developed a content standard for spatial metadata to facilitate documentation, discovery, and retrieval of digital spatial data using vendor-independent terminology. Spatial metadata elements are identifiable quality and content characteristics of a data set that can be tied to a geographic location or area. Several Office of Management and Budget Circulars and initiatives have been issued that specify improved cataloguing of and accessibility to federal data holdings. An Executive Order further requires the use of the metadata content standard to document digital spatial data sets. Collection and reporting of spatial metadata for field investigations performed for the federal government is an anticipated requirement. This paper provides an overview of the draft spatial metadata content standard and a description of how the standard could be applied to investigations collecting spatially-referenced field data.

  13. ACO-Initialized Wavelet Neural Network for Vibration Fault Diagnosis of Hydroturbine Generating Unit

    OpenAIRE

    Xiao, Zhihuai; He, Xinying; Fu, Xiangqian; Malik, O. P.

    2015-01-01

    Considering the drawbacks of traditional wavelet neural network, such as low convergence speed and high sensitivity to initial parameters, an ant colony optimization- (ACO-) initialized wavelet neural network is proposed in this paper for vibration fault diagnosis of a hydroturbine generating unit. In this method, parameters of the wavelet neural network are initialized by the ACO algorithm, and then the wavelet neural network is trained by the gradient descent algorithm. Amplitudes of the fr...

  14. Characterizing the transition region of an A508 cl3 steel using small specimens by the reference temperature and the weak-link distances

    International Nuclear Information System (INIS)

    Miranda, C.A.J.

    2001-01-01

    An experimental program was developed to characterize the transition region of an A508 cl3 steel. Some fracture mechanic specimens were tested in the transition region using three geometries with thickness B c values, the reference temperature values, To, associated with each geometry and test temperature, and the measured r wl distances and the theoretical ones. (author)

  15. Biocompatibility of metal injection molded versus wrought ASTM F562 (MP35N) and ASTM F1537 (CCM) cobalt alloys.

    Science.gov (United States)

    Chen, Hao; Sago, Alan; West, Shari; Farina, Jeff; Eckert, John; Broadley, Mark

    2011-01-01

    We present a comparative analysis between biocompatibility test results of wrought and Metal Injection Molded (MIM) ASTM F562-02 UNS R30035 (MP35N) and F1537 UNS R31538 (CCM) alloy samples that have undergone the same generic orthopedic implant's mechanical, chemical surface pre-treatment, and a designed pre-testing sample preparation method. Because the biocompatibility properties resulting from this new MIM cobalt alloy process are not well understood, we conducted tests to evaluate cytotoxicity (in vitro), hemolysis (in vitro), toxicity effects (in vivo), tissue irritation level (in vivo), and pyrogenicity count (in vitro) on such samples. We show that our developed MIM MP35N and CCM materials and treatment processes are biocompatible, and that both the MIM and wrought samples, although somewhat different in microstructure and surface, do not show significant differences in biocompatibility.

  16. Developing the (ASTM) voluntary consensus standards required to help implement the National Energy Plan

    International Nuclear Information System (INIS)

    Anon.

    1981-01-01

    The recommended guide is the first American Society for Testing and Materials (ASTM) matrix in a family of such documents that combined, will help manage the development of the ASTM standards considered necessary to implement the current National Plan for Energy Research, Development, and Demonstration. It is expected that the guide will provide a framework for standards development to complement the nation's research and development in support of critical energy needs. The recommended guide identifies the energy-critical areas that are to be developed, the master ASTM recommended guide for developing the standards required to help the National Plan, the section in which each energy-critical area is covered, and the suggested ASTM lead committee responsible for each area (fossil, solar, geothermal, conservation, fusion, and fission reactor development). A comprehensive matrix to identify the areas of need for which ASTM standards will be required to help implement the National Energy Plan is also presented

  17. Microstructural evolution and mechanical characterization for the A508-3 steel before and after phase transition

    Science.gov (United States)

    Lu, Chuanyang; He, Yanming; Gao, Zengliang; Yang, Jianguo; Jin, Weiya; Xie, Zhigang

    2017-11-01

    Nuclear power, as a reliable clean and economical energy source, has gained great attention from all over the world. The A508-3 steel will be introduced as the structural materials for Chinese nuclear reactor pressure vessels (RPVs). This work investigated the temperature-dependence microstructural evolution during high-temperature heat treatments, and built the relationship between the microstructure and mechanical properties for the steel before and after phase transition. The results show that the original steel consists of the bainite, allotriomorphic ferrite, retained austenite and few Mo-rich M2C carbides. The phase-transition temperature of the steel is determined to be 750 °C. The tensile tests performed at 20-1000 °C indicate that both of the yield strength and ultimate tensile strength decrease monotonously with increasing the temperature. Before phase transition, precipitation of cementite from the retained austenite and coarsening of cementite at the austenite-ferrite interphases should be responsible for their sharp decrease. After phase transition, the growth of austenite grain reduces the strength moderately. As for the elongation, however, it increases dramatically when the testing temperature is over 750 °C, due to the dissolution of cementite and formation of austenite. The obtained results will provide some fundamental data to understand and implement the In-Vessel Retention strategy.

  18. A study of long term ageing effects in A533B Class 1 and A508 Class 3 steels

    International Nuclear Information System (INIS)

    Druce, S.G.

    1981-08-01

    The effects of long term thermal ageing treatments on notched impact fracture properties has been studied in two commercially produced PWR pressure vessel steels, A533B Class 1 and A508 Class 3. Heat treatments of up to 10,000h duration at temperatures between 300 and 600 0 C have been investigated. Additionally the effects of specimen size, specimen orientation, specimen position from within the plate and the effect of a prior post weld heat treatment on subsequent fracture behaviour following thermal ageing have been evaluated for the A533B Class 1 material. The susceptibility of both materials to temper embrittlement effects is relatively low, the maximum increase in transition temperature following thermal ageing treatments in the temperature range 300 to 500 0 C being about 40 to 45 0 C. Thermal ageing at 600 0 C for times in excess of 100h produces microstructural changes resulting in larger increases in transition temperature. For the A533B material, specimen position and orientation are found to have a large influence on impact behaviour but do not affect the susceptibility to temper embrittlement. Post weld heat treatment has little or no influence on impact fracture behaviour before further isothermal ageing treatments nor on susceptibility to temper embrittlement. (author)

  19. RNA Interference of 1-Aminocyclopropane-1-carboxylic Acid Oxidase (ACO1 and ACO2 Genes Expression Prolongs the Shelf Life of Eksotika (Carica papaya L. Papaya Fruit

    Directory of Open Access Journals (Sweden)

    Rogayah Sekeli

    2014-06-01

    Full Text Available The purpose of this study was to evaluate the effectiveness of using RNA interference in down regulating the expression of 1-aminocyclopropane-1-carboxylic acid oxidase gene in Eksotika papaya. One-month old embryogenic calli were separately transformed with Agrobacterium strain LBA 4404 harbouring the three different RNAi pOpOff2 constructs bearing the 1-aminocyclopropane-1-carboxylic acid oxidase gene. A total of 176 putative transformed lines were produced from 15,000 calli transformed, selected, then regenerated on medium supplemented with kanamycin. Integration and expression of the targeted gene in putatively transformed lines were verified by PCR and real-time RT-PCR. Confined field evaluation of a total of 31 putative transgenic lines planted showed a knockdown expression of the targeted ACO1 and ACO2 genes in 13 lines, which required more than 8 days to achieve the full yellow colour (Index 6. Fruits harvested from lines pRNAiACO2 L2-9 and pRNAiACO1 L2 exhibited about 20 and 14 days extended post-harvest shelf life to reach Index 6, respectively. The total soluble solids contents of the fruits ranged from 11 to 14° Brix, a range similar to fruits from non-transformed, wild type seed-derived plants.

  20. Model of ASTM Flammability Test in Microgravity: Iron Rods

    Science.gov (United States)

    Steinberg, Theodore A; Stoltzfus, Joel M.; Fries, Joseph (Technical Monitor)

    2000-01-01

    There is extensive qualitative results from burning metallic materials in a NASA/ASTM flammability test system in normal gravity. However, this data was shown to be inconclusive for applications involving oxygen-enriched atmospheres under microgravity conditions by conducting tests using the 2.2-second Lewis Research Center (LeRC) Drop Tower. Data from neither type of test has been reduced to fundamental kinetic and dynamic systems parameters. This paper reports the initial model analysis for burning iron rods under microgravity conditions using data obtained at the LERC tower and modeling the burning system after ignition. Under the conditions of the test the burning mass regresses up the rod to be detached upon deceleration at the end of the drop. The model describes the burning system as a semi-batch, well-mixed reactor with product accumulation only. This model is consistent with the 2.0-second duration of the test. Transient temperature and pressure measurements are made on the chamber volume. The rod solid-liquid interface melting rate is obtained from film records. The model consists of a set of 17 non-linear, first-order differential equations which are solved using MATLAB. This analysis confirms that a first-order rate, in oxygen concentration, is consistent for the iron-oxygen kinetic reaction. An apparent activation energy of 246.8 kJ/mol is consistent for this model.

  1. [ACOS: Clinical and functional features The Russian formulation mesalazine (kansalazine) in the therapy of ulcerative colitis].

    Science.gov (United States)

    Sobko, E A; Chubarova, S V; Demko, I V; Loktionova, M M; Ishchenko, O P; Solovyeva, I A; Kraposhina, A Yu; Gordeeva, N V

    To investigate the clinical and functional parameters in patients with asthma-chronic obstructive pulmonary disease overlap syndrome (ACOS) versus those with chronic obstructive pulmonary disease (COPD) and asthma. A total of 129 people were examined. 51 patients with ACOS were followed up in Group 1; Group 2 included 38 patients with severe asthma; Group 3 consisted of 40 patients with severe COPD. All the patients underwent clinical examination: history data collection, physical examination, evaluation of disease symptoms, and study of respiratory function (spirometry, body plethysmography). ACOS is clinically characterized by considerable demands for emergency drugs and by more frequent asthmatic fits and exacerbations, which require hospitalization. The parameters of bronchial resistance in ACOS were established to be increased throughout the follow-up period and to be comparable with those in patients with COPD. In the patients with ACOS, the severity of pulmonary hyperinflation was associated with increased demands for emergency drugs (r=0.59; p=0.015). Fixed bronchial obstruction in ACOS can be caused by smoking intensity and duration associated with increased bronchial resistance in expiration (r=0.51; p=0.003) and intrathoracic volume (r=0.71; p=0.0001); as well as increased body mass index (p<0.001) and disease duration, which were interrelated with a reduction in the forced expiratory volume in one second/forced vital capacity ratio (r=-0.63; p=0.001 and r=-0.71; p=0.0034, respectively). Patients with ACOS show more severe clinical manifestations and a substantial increase in functional residual capacity and intrathoracic volume throughout the follow-up period, suggesting that the distal bronchi are impaired and pulmonary hyperinflation develops.

  2. MGA trajectory planning with an ACO-inspired algorithm

    Science.gov (United States)

    Ceriotti, Matteo; Vasile, Massimiliano

    2010-11-01

    Given a set of celestial bodies, the problem of finding an optimal sequence of swing-bys, deep space manoeuvres (DSM) and transfer arcs connecting the elements of the set is combinatorial in nature. The number of possible paths grows exponentially with the number of celestial bodies. Therefore, the design of an optimal multiple gravity assist (MGA) trajectory is a NP-hard mixed combinatorial-continuous problem. Its automated solution would greatly improve the design of future space missions, allowing the assessment of a large number of alternative mission options in a short time. This work proposes to formulate the complete automated design of a multiple gravity assist trajectory as an autonomous planning and scheduling problem. The resulting scheduled plan will provide the optimal planetary sequence and a good estimation of the set of associated optimal trajectories. The trajectory model consists of a sequence of celestial bodies connected by two-dimensional transfer arcs containing one DSM. For each transfer arc, the position of the planet and the spacecraft, at the time of arrival, are matched by varying the pericentre of the preceding swing-by, or the magnitude of the launch excess velocity, for the first arc. For each departure date, this model generates a full tree of possible transfers from the departure to the destination planet. Each leaf of the tree represents a planetary encounter and a possible way to reach that planet. An algorithm inspired by ant colony optimization (ACO) is devised to explore the space of possible plans. The ants explore the tree from departure to destination adding one node at the time: every time an ant is at a node, a probability function is used to select a feasible direction. This approach to automatic trajectory planning is applied to the design of optimal transfers to Saturn and among the Galilean moons of Jupiter. Solutions are compared to those found through more traditional genetic-algorithm techniques.

  3. 77 FR 10358 - Acceptance of ASTM F963-11 as a Mandatory Consumer Product Safety Standard

    Science.gov (United States)

    2012-02-22

    ... CONSUMER PRODUCT SAFETY COMMISSION 16 CFR Chapter II Acceptance of ASTM F963-11 as a Mandatory... have accepted the revised ASTM F963-11 standard titled, Standard Consumer Safety Specifications for Toy Safety. Pursuant to section 106 of the Consumer Product Safety Improvement Act of 2008, ASTM F963-11 will...

  4. Sources of Confusion in the Determination of ASTM Repetitive Member Factors for the Allowable Properties of Wood Products

    Science.gov (United States)

    S. Verrill; D. Kretschmann

    2012-01-01

    It is generally accepted that there should be an upward repetitive member allowable property adjustment. ASTM D245 (2011c) and ASTM D1990 (2011b) specify a 1.15 factor for allowable bending stress. This factor is also listed in ASTM D6555 (2011a, Table 1). In this technical note, sources of confusion regarding appropriate repetitive member factors are identified. This...

  5. 76 FR 78614 - Welded ASTM A-312 Stainless Steel Pipe From South Korea and Taiwan: Continuation of Antidumping...

    Science.gov (United States)

    2011-12-19

    ... DEPARTMENT OF COMMERCE International Trade Administration [A-580-810, A-583-815] Welded ASTM A-312... revocation of the antidumping duty orders on welded ASTM A-312 stainless steel pipe from South Korea (Korea... December 30, 1992, the Department published the antidumping duty orders on welded ASTM A-312 stainless...

  6. 76 FR 67673 - Welded ASTM A-312 Stainless Steel Pipe From South Korea and Taiwan: Final Results of Expedited...

    Science.gov (United States)

    2011-11-02

    ... DEPARTMENT OF COMMERCE International Trade Administration [A-580-810, A-583-815] Welded ASTM A-312... the antidumping duty orders on welded ASTM A-312 stainless steel pipe from South Korea and Taiwan... duty orders on welded ASTM A-312 stainless steel pipe from South Korea and Taiwan pursuant to section...

  7. Hydrogen embrittlement of ASTM A 203 D nuclear structural steel

    International Nuclear Information System (INIS)

    Chakravartty, J.K.; Prasad, G.E.; Sinha, T.K.; Asundi, M.K.

    1986-01-01

    The influence of hydrogen on the mechanical properties of ASTM A 203 D nuclear structural steel has been studied by tension, bend and delayed-failure tests at room temperature. While the tension tests of hydrogen charged unnotched specimens reveal no change in ultimate strength and ductility, the effect of hydrogen is manifested in notched specimens (tensile and bend) as a decrease in ultimate strength (maximum load in bend test) and ductility; the effect increases with increasing hydrogen content. It is observed that for a given hydrogen concentration, the decrease in bend ductility is remarkably large compared to that in tensile ductility. Hydrogen charging does not cause any delayed-failure upto 200 h under an applied tensile stress, 0.85 times the notch tensile strength. However delayed failure occurs in hydrogen charged bend samples in less than 10 h under an applied bending load of about 0.80 times of the uncharged maximum load. Fractographs of hydrogen charged unnotched specimens show ductile dimple fracture, while those of notched tension and bend specimens under hydrogen-charged conditions show a mixture of ductile dimple and quasi-cleavage cracking. The proportion of quasi-cleavage cracking increases with increasing hydrogen content and this fracture mode is more predominant in bend specimens. The changes in tensile properties and fracture modes can reasonably be explained by existing theories of hydrogen embrittlement. An attempt is made to explain the significant difference in the embrittlement susceptibility of bend and tensile specimens in the light of difference in triaxiality and plastic zone size near the notch tip. (orig.)

  8. Microstructure and mechanical property change of dissimilar metal welds Alloy 600 - Alloy 182 - A508 Gr. 3 according to thermal aging effect at 400 .deg. C

    Energy Technology Data Exchange (ETDEWEB)

    Ham, Jun Hyuk; Choi, Kyoung Joon; Kim, Ji Hyun [Ulsan National Institute of Science and Technology, Ulsan (Korea, Republic of)

    2015-10-15

    To prevent such critical matters above mentioned, investigation about degradation mechanism of materials by thermal aging should be conducted. However, there are no sufficient studies on this field. Therefore, the final goal of this study is to investigate microstructure along the DMW undergone thermal aging process. Firstly, in order to get a reference data for further comparison analysis which is expected to show degradation mechanism of the weld joint, un-heated weld joint was investigated with several instruments, Vickers hardness tester, scanning electron microscope (SEM), and an energy-dispersive X-ray spectrometer (EDS). Detail instrumental analysis in Alloy 600 - Alloy 182 - A508 Gr. 3 DMW joint were performed in order to investigate microstructure and mechanical properties of material. Following conclusions can be drawn from this study. Alloy 182 has austenitic dendrite structure which is formed by heat flow during welding process. Type-II boundaries were observed at the interface between Alloy 182 and A508 Gr. 3. Chemical composition shows rapid transition at the interface which makes 3000 µm of chromium dilution zone. Microstructure of A508 Gr. 3 was investigated from the interface between Alloy 182 to base metal.

  9. ACO-Initialized Wavelet Neural Network for Vibration Fault Diagnosis of Hydroturbine Generating Unit

    Directory of Open Access Journals (Sweden)

    Zhihuai Xiao

    2015-01-01

    Full Text Available Considering the drawbacks of traditional wavelet neural network, such as low convergence speed and high sensitivity to initial parameters, an ant colony optimization- (ACO- initialized wavelet neural network is proposed in this paper for vibration fault diagnosis of a hydroturbine generating unit. In this method, parameters of the wavelet neural network are initialized by the ACO algorithm, and then the wavelet neural network is trained by the gradient descent algorithm. Amplitudes of the frequency components of the hydroturbine generating unit vibration signals are used as feature vectors for wavelet neural network training to realize mapping relationship from vibration features to fault types. A real vibration fault diagnosis case result of a hydroturbine generating unit shows that the proposed method has faster convergence speed and stronger generalization ability than the traditional wavelet neural network and ACO wavelet neural network. Thus it can provide an effective solution for online vibration fault diagnosis of a hydroturbine generating unit.

  10. Susceptibility to false memories in patients with ACoA aneurysm.

    Science.gov (United States)

    Borsutzky, Sabine; Fujiwara, Esther; Brand, Matthias; Markowitsch, Hans J

    2010-08-01

    We examined ACoA patients regarding their susceptibility to a range of false memory phenomena. We targeted provoked confabulation, false recall and false recognition in the Deese-Roediger-McDermott-paradigm (DRM-paradigm) as well as false recognition in a mirror reading task. ACoA patients produced more provoked confabulations and more false recognition in mirror reading than comparison subjects. Conversely, false recall/false recognition in the DRM-paradigm were similar in patients and controls. Whereas the former two indices of false memories were correlated, no relationship was revealed with the DRM-paradigm. Our results suggest that rupture of ACoA aneurysm leads to an increased susceptibility to a subset of false memories types. Copyright (c) 2010 Elsevier Ltd. All rights reserved.

  11. Fracture toughness of welded joints of ASTM A543 steel plate

    International Nuclear Information System (INIS)

    Susukida, H.; Uebayashi, T.; Yoshida, K.; Ando, Y.

    1977-01-01

    Fracture toughness and weldability tests have been performed on a high strength steel which is a modification of ASTM A543 Grade B Class 1 steel, with a view to using it for nuclear reactor containment vessels. The results showed that fracture toughness of welded joints of ASTM A543 modified high strength steel is superior and the steel is suitable for manufacturing the containment vessels

  12. Integration of Nanofluids into Commercial Antifreeze Concentrates with ASTM D15 Corrosion Testing

    Science.gov (United States)

    2013-05-01

    Lockwood1 1 Valvoline New Product Development Laboratory, Ashland Consumer Markets , Lexington, Kentucky. 2 Tank Automotive Research, Development...Development Laboratory,Ashland Consumer Markets ,P.O. Box 14000,Lexington,KY,40512 8. PERFORMING ORGANIZATION REPORT NUMBER ; #23826 9. SPONSORING...Technology, Performance, and Life for Light-Duty Applications, Engine Coolant Testing: Fourth Volume, ASTM STP 1335, R.E. Beale ed., ASTM, Philadelphia

  13. Trasplante cardíaco pediátrico: pasado, presente y futuro

    Directory of Open Access Journals (Sweden)

    María-Teresa González-López

    2017-01-01

    Conclusión: El trasplante cardíaco pediátrico presenta óptimos resultados en nuestro medio, superponibles a series mundiales. Aunque el perfil de riesgo está incrementándose, los resultados actuales reflejan los avances en el manejo de estos pacientes.

  14. Tests were inconclusive: California's experiment with ACOs raises questions about whether they'll save money.

    Science.gov (United States)

    Vesely, Rebecca

    2010-11-01

    In California, many providers have been working in accountable care organizations for decades, and they say they can work well. "It's not the type of organization that defines the success of an ACO, it's the leadership," said Tom Williams, executive director of the Oakland, Calif.-based Integrated Healthcare Association. "For success, there needs to be alignment between hospitals and physicians."

  15. Towards the Fourier limit on the super-ACO Storage Ring FEL

    International Nuclear Information System (INIS)

    Couprie, M.E.; De Ninno, G.; Moneron, G.; Nutarelli, D.; Hirsch, M.; Garzella, D.; Renault, E.; Roux, R.; Thomas, C.

    2001-01-01

    Systematic studies on the Free Electron Laser (FEL) line and micropulse have been performed on the Super-ACO storage ring FEL with a monochromator and a double-sweep streak camera under various conditions of operation (detuning, 'CW' and Q-switched mode). From these data, it appears that the FEL is usually operated very close to the Fourier limit

  16. Towards the Fourier limit on the super-ACO Storage Ring FEL

    CERN Document Server

    Couprie, Marie Emmanuelle; Garzella, D; Hirsch, M; Moneron, G; Nutarelli, D; Renault, E; Roux, R; Thomas, C

    2001-01-01

    Systematic studies on the Free Electron Laser (FEL) line and micropulse have been performed on the Super-ACO storage ring FEL with a monochromator and a double-sweep streak camera under various conditions of operation (detuning, 'CW' and Q-switched mode). From these data, it appears that the FEL is usually operated very close to the Fourier limit.

  17. 288. Feocromocitoma Cardíaco a Nivel Del Surco Interauricular

    Directory of Open Access Journals (Sweden)

    C. Iglesias Gil

    2012-04-01

    La localización extraadrenal de los feocromocitomas es infrecuente, siendo la torácica inferior al 2% y la intrapericárdica excepcional. Dado que son escasos los reportes de tumores secretores de catecolaminas a nivel cardíaco, presentamos este caso.

  18. Optimization of reload of nuclear power plants using ACO together with the GENES reactor physics code

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Alan M.M. de; Freire, Fernando S.; Nicolau, Andressa S.; Schirru, Roberto, E-mail: alan@lmp.ufrj.br, E-mail: andressa@lmp.ufrj.br, E-mail: schirru@lmp.ufrj.br, E-mail: ffreire@eletronuclear.gov.br [Coordenacao de Pos-Graduacao e Pesquisa de Engenharia (PEN/COPPE/UFRJ), Rio de Janeiro, RJ (Brazil); Eletrobras Termonuclear S.A. (ELETRONUCLEAR), Rio de Janeiro, RJ (Brazil)

    2017-11-01

    The Nuclear reload of a Pressurized Water Reactor (PWR) occurs whenever the burning of the fuel elements can no longer maintain the criticality of the reactor, that is, it cannot maintain the Nuclear power plant operates within its nominal power. Nuclear reactor reload optimization problem consists of finding a loading pattern of fuel assemblies in the reactor core in order to minimize the cost/benefit ratio, trying to obtain maximum power generation with a minimum of cost, since in all reloads an average of one third of the new fuel elements are purchased. This loading pattern must also satisfy constraints of symmetry and security. In practice, it consists of the placing 121 fuel elements in 121 core positions, in the case of the Angra 1 Brazilian Nuclear Power Plant (NPP), making this new arrangement provide the best cost/benefit ratio. It is an extremely complex problem, since it has around 1% of great places. A core of 121 fuel elements has approximately 10{sup 13} combinations and 10{sup 11} great locations. With this number of possible combinations it is impossible to test all, in order to choose the best. In this work a system called ACO-GENES is proposed in order to optimization the Nuclear Reactor Reload Problem. ACO is successfully used in combination problems, and it is expected that ACO-GENES will show a robust optimization system, since in addition to optimizing ACO, it allows important prior knowledge such as K infinite, burn, etc. After optimization by ACO-GENES, the best results will be validated by a licensed reactor physics code and will be compared with the actual results of the cycle. (author)

  19. Optimization of reload of nuclear power plants using ACO together with the GENES reactor physics code

    International Nuclear Information System (INIS)

    Lima, Alan M.M. de; Freire, Fernando S.; Nicolau, Andressa S.; Schirru, Roberto

    2017-01-01

    The Nuclear reload of a Pressurized Water Reactor (PWR) occurs whenever the burning of the fuel elements can no longer maintain the criticality of the reactor, that is, it cannot maintain the Nuclear power plant operates within its nominal power. Nuclear reactor reload optimization problem consists of finding a loading pattern of fuel assemblies in the reactor core in order to minimize the cost/benefit ratio, trying to obtain maximum power generation with a minimum of cost, since in all reloads an average of one third of the new fuel elements are purchased. This loading pattern must also satisfy constraints of symmetry and security. In practice, it consists of the placing 121 fuel elements in 121 core positions, in the case of the Angra 1 Brazilian Nuclear Power Plant (NPP), making this new arrangement provide the best cost/benefit ratio. It is an extremely complex problem, since it has around 1% of great places. A core of 121 fuel elements has approximately 10"1"3 combinations and 10"1"1 great locations. With this number of possible combinations it is impossible to test all, in order to choose the best. In this work a system called ACO-GENES is proposed in order to optimization the Nuclear Reactor Reload Problem. ACO is successfully used in combination problems, and it is expected that ACO-GENES will show a robust optimization system, since in addition to optimizing ACO, it allows important prior knowledge such as K infinite, burn, etc. After optimization by ACO-GENES, the best results will be validated by a licensed reactor physics code and will be compared with the actual results of the cycle. (author)

  20. Characterization of microstructure of A508III/309L/308L weld and oxide films formed in deaerated high-temperature water

    Science.gov (United States)

    Xiong, Qi; Li, Hongjuan; Lu, Zhanpeng; Chen, Junjie; Xiao, Qian; Ma, Jiarong; Ru, Xiangkun

    2018-01-01

    The microstructure of A508III/309L/308L weld clad and the properties of the oxide films formed in simulated pressurized water reactor primary water at 290 °C were characterized. The A508III heat-affected zone (HAZ) consisted primarily of a decarburization zone with ferrite near the fusion line and a following pearlite structure with fine grains. A high hardness region in the HAZ could be the result of C-enrichment. M23C6 and M7C3 precipitates were observed in element transition zone. 308L stainless steel (SS) containing ∼ 12% ferrites exhibited both ferritic-austenitic solidification mode (FA mode, δ→γ) and austenitic-ferritic solidification mode (AF mode, γ→δ), whereas 309L SS containing ∼ 9% ferrites exhibited only FA mode. The A508III surface oxide film was mainly Fe3O4 in deaerated high-temperature water. The coarse grain zone covered with few oxide particles was different from other types of film on the other region of HAZ and the bulk zone. More pitting appears on 309L SS after immersion in deaerated high-temperature water due to the dissolution of inclusions. SS surface oxide films consisted primarily of spinels. The oxide film on SS was divided into two layers. Ni was concentrated mainly at the oxide/substrate interface. The oxide film formed on 309L was thicker than that on the 308L. The ferrite in the stainless steel could improve the oxidation resistance.

  1. ASTM standards associated with PWR and BWR power plant licensing, operation and surveillance

    International Nuclear Information System (INIS)

    McElroy, W.N.; McElroy, R.J.; Gold, R.; Lippincott, E.P.; Lowe, A.L. Jr.

    1994-01-01

    This paper considers ASTM Standards that are available, under revision, and are being considered in support of Pressurized Water Reactor (PWR) and Boiling Water Reactor (BWR) Nuclear Power Plant (NPP) licensing, regulation, operation, surveillance and life attainment. The current activities of ASTM Committee E10 and its Subcommittees E10.02 and current activities of ASTM Committee E10 and its Subcommittees E10.02 and E10.05 and their Task Groups (TG) are described. A very important aspect of these efforts is the preparation, revision, and balloting of standards identified in the ASTM E706 Standard on Master Matrix for Light Water Reactor (LWR) Pressure Vessel (PV) Surveillance Standards. The current version (E706-87) of the Master Matrix identifies 21 ASTM LWR physics-dosimetry-metallurgy standards for Reactor Pressure Vessel (RPV) and Support Structure (SS) surveillance programs, whereas, for the next revision 34 standards are identified. The need for national and international coordination of Standards Technology Development, Transfer and Training (STDTT) is considered in this and other Symposium papers that address specific standards related physics-dosimetry-metallurgy issues. 69 refs

  2. Formation of microcracks during stress-relief annealing of a weldment in pressure vessel steel of type A508 C1 2

    International Nuclear Information System (INIS)

    Liljestrand, L.-G.; Oestberg, G.; Lindhagen, P.

    1978-01-01

    Crack formation in the heat-affected zones of heavy section weldments of type A 508 C1 2 pressure vessel steel during stress-relief annealing has been studied on an actual weldment and on simulated structures. Mechanical testing of the latter showed that stress relaxation of the order of magnitude occuring during stress-relief annealing can produce cracks of the same kind as occasionally found in weldments of pressure vessel steel. The primary cause is believed to be grain boundary sliding, possibly but not necessarily enhanced by impurities. (Auth.)

  3. Combating Wear of ASTM A36 Steel by Surface Modification Using Thermally Sprayed Cermet Coatings

    OpenAIRE

    Shibe, Vineet; Chawla, Vikas

    2016-01-01

    Thermal spray coatings can be applied economically on machine parts to enhance their requisite surface properties like wear, corrosion, erosion resistance, and so forth. Detonation gun (D-Gun) thermal spray coatings can be applied on the surface of carbon steels to improve their wear resistance. In the present study, alloy powder cermet coatings WC-12% Co and Cr3C2-25% NiCr have been deposited on ASTM A36 steel with D-Gun thermal spray technique. Sliding wear behavior of uncoated ASTM A36 ste...

  4. Topology in two dimensions. II - The Abell and ACO cluster catalogues

    Science.gov (United States)

    Plionis, Manolis; Valdarnini, Riccardo; Coles, Peter

    1992-09-01

    We apply a method for quantifying the topology of projected galaxy clustering to the Abell and ACO catalogues of rich clusters. We use numerical simulations to quantify the statistical bias involved in using high peaks to define the large-scale structure, and we use the results obtained to correct our observational determinations for this known selection effect and also for possible errors introduced by boundary effects. We find that the Abell cluster sample is consistent with clusters being identified with high peaks of a Gaussian random field, but that the ACO shows a slight meatball shift away from the Gaussian behavior over and above that expected purely from the high-peak selection. The most conservative explanation of this effect is that it is caused by some artefact of the procedure used to select the clusters in the two samples.

  5. Protocolo del manejo y selección del donante cardíaco

    Directory of Open Access Journals (Sweden)

    José Elizalde

    2008-01-01

    Full Text Available El trasplante cardíaco es una terapia aceptada en grupos de pacientes afectos de insuficiencia cardíaca terminal. El envejecimiento progresivo de los donantes y la reducción del número de traumatismos craneoencefálicos mortales obliga a una valoración exhaustiva en cada caso. La ecocardiografía es, hoy en día, una exploración obligada en la valoración del donante. La Organización Nacional de Trasplantes ha elaborado un protocolo de manejo del donante torácico para optimizar su aprovechamiento. Se revisan los criterios de selección del donante cardíaco insistiendo en las contraindicaciones, en el despistaje de enfermedad coronaria y el mantenimiento durante el proceso de selección.

  6. Applications of UV-storage ring free electron lasers: the case of super-ACO

    CERN Document Server

    Nahon, L; Couprie, Marie Emmanuelle; Merola, F; Dumas, P; Marsi, M; Taleb-Ibrahimi, A; Nutarelli, D; Roux, R; Billardon, M

    1999-01-01

    The potential of UV-storage ring free electron lasers (SRFELs) for the performance of original application experiments is shown with a special emphasis concerning their combination with the naturally synchronized synchrotron radiation (SR). The first two-color FEL+SR experiment, performed in surface science at Super-ACO is reported. The experimental parameters found to be the most important as gathered from the acquired experience, are underlined and discussed. Finally, future prospects for the scientific program of the Super-ACO FEL are presented with two-color experiments combining the FEL with SR undulator-based XUV and VUV beamlines as well as with a SR white light bending magnet beamline emiting in the IR-UV (20 mu m-0.25 mu m).

  7. Do accountable care organizations (ACOs) help or hinder primary care physicians' ability to deliver high-quality care?

    Science.gov (United States)

    Berenson, Robert A; Burton, Rachel A; McGrath, Megan

    2016-09-01

    Many view advanced primary care models such as the patient-centered medical home as foundational for accountable care organizations (ACOs), but it remains unclear how these two delivery reforms are complementary and how they may produce conflict. The objective of this study was to identify how joining an ACO could help or hinder a primary care practice's efforts to deliver high-quality care. This qualitative study involved interviews with a purposive sample of 32 early adopters of advanced primary care and/or ACO models, drawn from across the U.S. and conducted in mid-2014. Interview notes were coded using qualitative data analysis software, permitting topic-specific queries which were then summarized. Respondents perceived many potential benefits of joining an ACO, including care coordination staff, data analytics, and improved communication with other providers. However, respondents were also concerned about added "bureaucratic" requirements, referral restrictions, and a potential inability to recoup investments in practice improvements. Interviewees generally thought joining an ACO could complement a practice's efforts to deliver high-quality care, yet noted some concerns that could undermine these synergies. Both the advantages and disadvantages of joining an ACO seemed exacerbated for small practices, since they are most likely to benefit from additional resources yet are most likely to chafe under added bureaucratic requirements. Our identification of the potential pros and cons of joining an ACO may help providers identify areas to examine when weighing whether to enter into such an arrangement, and may help ACOs identify potential areas for improvement. Copyright © 2016 Elsevier Inc. All rights reserved.

  8. Betting on change: Tenet deal with Vanguard shows it's primed to try ACO effort, new payment model.

    Science.gov (United States)

    Kutscher, Beth

    2013-07-01

    Tenet Healthcare Corp.'s acquisition of Vanguard Health Systems is a sign the investor-owned chain is willing to take a chance on alternative payment models such as accountable care organizations. There's no certainty that ACOs will deliver the improvements on quality or cost savings, but Vanguard Vice Chairman Keith Pitts, left, says his system's Pioneer ACO in Detroit has already achieved some cost savings.

  9. BER Performance of Stratified ACO-OFDM for Optical Wireless Communications over Multipath Channel

    OpenAIRE

    Gebeyehu, Zelalem Hailu; Langat, Philip Kibet; Maina, Ciira Wa

    2018-01-01

    In intensity modulation/direct detection- (IM/DD-) based optical OFDM systems, the requirement of the input signal to be real and positive unipolar imposes a reduction of system performances. Among previously proposed unipolar optical OFDM schemes for optical wireless communications (OWC), asymmetrically clipped optical OFDM (ACO-OFDM) and direct current biased optical OFDM (DCO-OFDM) are the most accepted ones. But those proposed schemes experience either spectral efficiency loss or energy e...

  10. Doctors on deck. ACOs led by doctors seek to manage costs, quality and hospital relationships.

    Science.gov (United States)

    Evans, Melanie

    2012-04-16

    Most of the first crop of ACOs in the Medicare Shared Savings Program are owned and operated by physicians without formal participation of a hospital in the efforts to improve quality and curb costs. "There were some people who feared that the only entities that would participate would be hospital-dominated systems," says Jonathan Blum, director of the Center for Medicare Management at the CMS, left. "That has not happened".

  11. Comparing the Methodologies in ASTM G198: Is There an Easy Way Out?

    Science.gov (United States)

    Samuel L. Zelinka

    2013-01-01

    ASTM(1) G198, Standard test method for determining the relative corrosion performance of driven fasteners in contact with treated wood, was accepted by consensus and published in 2011. The method has two different exposure conditions for determining fastener corrosion performance in treated wood. The first method places the wood and embedded...

  12. Comparative field permeability measurement of permeable pavements using ASTM C1701 and NCAT permeameter methods.

    Science.gov (United States)

    Li, Hui; Kayhanian, Masoud; Harvey, John T

    2013-03-30

    Fully permeable pavement is gradually gaining support as an alternative best management practice (BMP) for stormwater runoff management. As the use of these pavements increases, a definitive test method is needed to measure hydraulic performance and to evaluate clogging, both for performance studies and for assessment of permeability for construction quality assurance and maintenance needs assessment. Two of the most commonly used permeability measurement tests for porous asphalt and pervious concrete are the National Center for Asphalt Technology (NCAT) permeameter and ASTM C1701, respectively. This study was undertaken to compare measured values for both methods in the field on a variety of permeable pavements used in current practice. The field measurements were performed using six experimental section designs with different permeable pavement surface types including pervious concrete, porous asphalt and permeable interlocking concrete pavers. Multiple measurements were performed at five locations on each pavement test section. The results showed that: (i) silicone gel is a superior sealing material to prevent water leakage compared with conventional plumbing putty; (ii) both methods (NCAT and ASTM) can effectively be used to measure the permeability of all pavement types and the surface material type will not impact the measurement precision; (iii) the permeability values measured with the ASTM method were 50-90% (75% on average) lower than those measured with the NCAT method; (iv) the larger permeameter cylinder diameter used in the ASTM method improved the reliability and reduced the variability of the measured permeability. Copyright © 2013 Elsevier Ltd. All rights reserved.

  13. The Status of silicosis in the world: Feedback on the ASTM Silica Symposium

    CSIR Research Space (South Africa)

    Pretorius, CJ

    2013-06-01

    Full Text Available The second ASTM Silica Symposium was held in Oct 2012 where speakers reported on the status of silicosis in their respective countries. Speakers reported on findings of research that they carried out on sampling equipment and analytical techniques...

  14. Deriving allowable properties of lumber : a practical guide for interpretation of ASTM standards

    Science.gov (United States)

    Alan Bendtsen; William L. Galligan

    1978-01-01

    The ASTM standards for establishing clear wood mechanical properties and for deriving structural grades and related allowable properties for visually graded lumber can be confusing and difficult for the uninitiated to interpret. This report provides a practical guide to using these standards for individuals not familiar with their application. Sample stress...

  15. Standard specification for tantalum and tantalum alloy plate, sheet, and strip. ASTM standard

    International Nuclear Information System (INIS)

    1998-09-01

    This specification is under the jurisdiction of ASTM Committee B-10 on Reactive and Refractory Metals and Alloys and is the direct responsibility of Subcommittee B10.03 on Niobium and Tantalum. Current edition approved May 10, 1998 and published September 1998. Originally published as B 708-82. Last previous edition was B 708-92

  16. Comparing the Methodologies in ASTM G198 Using Combined Hygrothermal-Corrosion Modeling

    Science.gov (United States)

    Samuel L. Zelinka

    2013-01-01

    ASTM G198, “Standard test method for determining the relative corrosion performance of driven fasteners in contact with treated wood,” was accepted by consensus and published in 2011. The method has two different exposure conditions for determining fastener corrosion performance in treated wood. The first method places the wood and embedded fasteners in a...

  17. ASTM Committee D-7 : Wood : promoting safety and standardization for 100 years

    Science.gov (United States)

    David W. Green; Robert L. Ethington

    2004-01-01

    In October 2004, Committee D-7 on Wood of the American Society for Testing and Materials (ASTM) is celebrating 100 years of contributions to the safe and efficient use of wood as a building material. Born during a period of rapid social, economic, and technological change, the Committee faced controversial issues and the challenge of a changing forest resource. This...

  18. An evaluation of efforts by nuclear power plants to use ASTM D3803-89

    International Nuclear Information System (INIS)

    Freeman, W.P.

    1995-01-01

    The number of nuclear power plants are now using ASTM D3803-89, open-quotes Standard Test Method for Nuclear-Grade Activated Carbonclose quotes for routine surveillance testing of adsorbents. In order to judge the impact of this change, we have gathered radioiodine removal test results from our data base on a system-by-system basis (i.e. control room, technical support center, and spent fuel pool) and compared test results obtained for the same kind of systems using the new and older test methods. Included in this comparison are systems with and without humidity control. Results are discussed from the standpoint of what to expect if a change to testing using ASTM D3803-89 is contemplated, especially regarding test results in light existing acceptance criteria. Additionally, the results are discussed from the standpoint of the sensitivity of the ASTM test method to detect when the performance of the carbon in air cleaning systems has been compromised (compared to the older methods). Finally, we offer some suggestions for how other plants might upgrade their carbon testing to incorporate testing to ASTM D3803-89

  19. Combating Wear of ASTM A36 Steel by Surface Modification Using Thermally Sprayed Cermet Coatings

    Directory of Open Access Journals (Sweden)

    Vineet Shibe

    2016-01-01

    Full Text Available Thermal spray coatings can be applied economically on machine parts to enhance their requisite surface properties like wear, corrosion, erosion resistance, and so forth. Detonation gun (D-Gun thermal spray coatings can be applied on the surface of carbon steels to improve their wear resistance. In the present study, alloy powder cermet coatings WC-12% Co and Cr3C2-25% NiCr have been deposited on ASTM A36 steel with D-Gun thermal spray technique. Sliding wear behavior of uncoated ASTM A36 steel and D-Gun sprayed WC-12% Co and Cr3C2-25% NiCr coatings on base material is observed on a Pin-On-Disc Wear Tester. Sliding wear performance of WC-12% Co coating is found to be better than the Cr3C2-25% NiCr coating. Wear performance of both these cermet coatings is found to be better than uncoated ASTM A36 steel. Thermally sprayed WC-12% Co and Cr3C2-25% NiCr cermet coatings using D-Gun thermal spray technique is found to be very useful in improving the sliding wear resistance of ASTM A36 steel.

  20. Autogenous shrinkage of Ducorit S5R ASTM C 1698-09 test method

    DEFF Research Database (Denmark)

    Damkilde, Lars

    The report deals with experimental measurement of autogenous shrinkage of Ducorit S5R according to the test method ASTM C 1698-09. This test method measures the bulk strain of a sealed cementitious specimen, at constant temperature and not subjected to external forces, from the time of final...

  1. An evaluation of efforts by nuclear power plants to use ASTM D3803-89

    Energy Technology Data Exchange (ETDEWEB)

    Freeman, W.P.

    1995-02-01

    The number of nuclear power plants are now using ASTM D3803-89, {open_quotes}Standard Test Method for Nuclear-Grade Activated Carbon{close_quotes} for routine surveillance testing of adsorbents. In order to judge the impact of this change, we have gathered radioiodine removal test results from our data base on a system-by-system basis (i.e. control room, technical support center, and spent fuel pool) and compared test results obtained for the same kind of systems using the new and older test methods. Included in this comparison are systems with and without humidity control. Results are discussed from the standpoint of what to expect if a change to testing using ASTM D3803-89 is contemplated, especially regarding test results in light existing acceptance criteria. Additionally, the results are discussed from the standpoint of the sensitivity of the ASTM test method to detect when the performance of the carbon in air cleaning systems has been compromised (compared to the older methods). Finally, we offer some suggestions for how other plants might upgrade their carbon testing to incorporate testing to ASTM D3803-89.

  2. Impact of Provider Participation in ACO Programs on Preventive Care Services, Patient Experiences, and Health Care Expenditures in US Adults Aged 18-64.

    Science.gov (United States)

    Hong, Young-Rock; Sonawane, Kalyani; Larson, Samantha; Mainous, Arch G; Marlow, Nicole M

    2018-05-15

    Little is known about the impact of accountable care organization (ACO) on US adults aged 18-64. To examine whether having a usual source of care (USC) provider participating in an ACO affects receipt of preventive care services, patient experiences, and health care expenditures among nonelderly Americans. A cross-sectional analysis of the 2015 Medical Organizations Survey linked with the Medical Expenditure Panel Survey. Survey respondents aged 18-64 with an identified USC and continuous health insurance coverage during 2015. Preventative care services (routine checkup, flu vaccination, and cancer screening), patient experiences with health care (access to care, interaction quality with providers, and global satisfaction), and health care expenditures (total and out-of-pocket expenditures) for respondents with USC by ACO and non-ACO provider groups. Among 1563, nonelderly Americans having a USC, we found that nearly 62.7% [95% confidence interval (CI), 58.6%-66.7%; representing 15,722,208 Americans] were cared for by ACO providers. Our analysis showed no significant differences in preventive care services or patient experiences between ACO and non-ACO groups. Adjusted mean total health expenditures were slightly higher for the ACO than non-ACO group [$7016 (95% CI, $4949-$9914) vs. $6796 (95% CI, $4724-$9892)]; however, this difference was not statistically significant (P=0.250). Our findings suggest that having a USC provider participating in an ACO is not associated with preventive care services use, patient experiences, or health care expenditures among a nonelderly population.

  3. Tailoring Systems Engineering Processes in a Conceptual Design Environment: A Case Study at NASA Marshall Spaceflight Center's ACO

    Science.gov (United States)

    Mulqueen, John; Maples, C. Dauphne; Fabisinski, Leo, III

    2012-01-01

    This paper provides an overview of Systems Engineering as it is applied in a conceptual design space systems department at the National Aeronautics and Space Administration (NASA) Marshall Spaceflight Center (MSFC) Advanced Concepts Office (ACO). Engineering work performed in the NASA MFSC's ACO is targeted toward the Exploratory Research and Concepts Development life cycle stages, as defined in the International Council on Systems Engineering (INCOSE) System Engineering Handbook. This paper addresses three ACO Systems Engineering tools that correspond to three INCOSE Technical Processes: Stakeholder Requirements Definition, Requirements Analysis, and Integration, as well as one Project Process Risk Management. These processes are used to facilitate, streamline, and manage systems engineering processes tailored for the earliest two life cycle stages, which is the environment in which ACO engineers work. The role of systems engineers and systems engineering as performed in ACO is explored in this paper. The need for tailoring Systems Engineering processes, tools, and products in the ever-changing engineering services ACO provides to its customers is addressed.

  4. Housing, Transportation, And Food: How ACOs Seek To Improve Population Health By Addressing Nonmedical Needs Of Patients.

    Science.gov (United States)

    Fraze, Taressa; Lewis, Valerie A; Rodriguez, Hector P; Fisher, Elliott S

    2016-11-01

    Addressing nonmedical needs-such as the need for housing-is critical to advancing population health, improving the quality of care, and lowering the costs of care. Accountable care organizations (ACOs) are well positioned to address these needs. We used qualitative interviews with ACO leaders and site visits to examine how these organizations addressed the nonmedical needs of their patients, and the extent to which they did so. We developed a typology of medical and social services integration among ACOs that disentangles service and organizational integration. We found that the nonmedical needs most commonly addressed by ACOs were the need for transportation and housing and food insecurity. ACOs identified nonmedical needs through processes that were part of the primary care visit or care transformation programs. Approaches to meeting patients' nonmedical needs were either individualized solutions (developed patient by patient) or targeted approaches (programs developed to address specific needs). As policy makers continue to provide incentives for health care organizations to meet a broader spectrum of patients' needs, these findings offer insights into how health care organizations such as ACOs integrate themselves with nonmedical organizations. Project HOPE—The People-to-People Health Foundation, Inc.

  5. PROPOSED ASTM METHOD FOR THE DETERMINATION OF ASBESTOS IN AIR BY TEM AND INFORMATION ON INTERFERING FIBERS

    Science.gov (United States)

    The draft of the ASTM Test Method for air entitled: "Airborne Asbestos Concentration in Ambient and Indoor Atmospheres as Determined by Transmission Electron Microscopy Direct Transfer (TEM)" (ASTM Z7077Z) is an adaptation of the International Standard, ISO 10312. It is currently...

  6. A performance improvement and cost-efficient ACO-OFDM scheme for visible light communications

    Science.gov (United States)

    Zhang, Tiantian; Zhou, Ji; Zhang, Zhenshan; Qiao, Yaojun; Su, Fei; Yang, Aiying

    2017-11-01

    In this paper, we propose a performance improvement and cost-efficient discrete Hartley transform (DHT)-based asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) scheme for visible light communications (VLC). The simple one-dimensional modulation constellation and simplified encoding structure reduce the complexity of system considerably. The DHT-spreading technique is employed to reduce peak-to-average power ratio (PAPR) of ACO-OFDM signals. Moreover, the intra-symbol frequency-domain averaging (ISFA) technique is used to increase the accuracy of channel estimation by removing the effect of ambient noise in the VLC channel effectively. To verify the feasibility of the proposed scheme, we study its performance via simulation. This scheme reduces the requirement to the resolution of DAC and increases the tolerance to the nonlinear characteristics of LED, both of which are cost-efficient. At forward error correction (FEC) limit (BER = 1 × 10-3), simulation results illustrate that compared with DHT-based ACO-OFDM without the ISFA technique, our scheme has 3.2 dB and 2.7 dB improvement of the required Eb /N0 when BPSK and 4-PAM are modulated, respectively.

  7. Solving optimum operation of single pump unit problem with ant colony optimization (ACO) algorithm

    International Nuclear Information System (INIS)

    Yuan, Y; Liu, C

    2012-01-01

    For pumping stations, the effective scheduling of daily pump operations from solutions to the optimum design operation problem is one of the greatest potential areas for energy cost-savings, there are some difficulties in solving this problem with traditional optimization methods due to the multimodality of the solution region. In this case, an ACO model for optimum operation of pumping unit is proposed and the solution method by ants searching is presented by rationally setting the object function and constrained conditions. A weighted directed graph was constructed and feasible solutions may be found by iteratively searching of artificial ants, and then the optimal solution can be obtained by applying the rule of state transition and the pheromone updating. An example calculation was conducted and the minimum cost was found as 4.9979. The result of ant colony algorithm was compared with the result from dynamic programming or evolutionary solving method in commercial software under the same discrete condition. The result of ACO is better and the computing time is shorter which indicates that ACO algorithm can provide a high application value to the field of optimal operation of pumping stations and related fields.

  8. Processing time tolerance-based ACO algorithm for solving job-shop scheduling problem

    Science.gov (United States)

    Luo, Yabo; Waden, Yongo P.

    2017-06-01

    Ordinarily, Job Shop Scheduling Problem (JSSP) is known as NP-hard problem which has uncertainty and complexity that cannot be handled by a linear method. Thus, currently studies on JSSP are concentrated mainly on applying different methods of improving the heuristics for optimizing the JSSP. However, there still exist many problems for efficient optimization in the JSSP, namely, low efficiency and poor reliability, which can easily trap the optimization process of JSSP into local optima. Therefore, to solve this problem, a study on Ant Colony Optimization (ACO) algorithm combined with constraint handling tactics is carried out in this paper. Further, the problem is subdivided into three parts: (1) Analysis of processing time tolerance-based constraint features in the JSSP which is performed by the constraint satisfying model; (2) Satisfying the constraints by considering the consistency technology and the constraint spreading algorithm in order to improve the performance of ACO algorithm. Hence, the JSSP model based on the improved ACO algorithm is constructed; (3) The effectiveness of the proposed method based on reliability and efficiency is shown through comparative experiments which are performed on benchmark problems. Consequently, the results obtained by the proposed method are better, and the applied technique can be used in optimizing JSSP.

  9. Trasplante cardíaco: organización e indicaciones

    Directory of Open Access Journals (Sweden)

    José M. Revuelta

    2008-01-01

    La experiencia clínica está demostrando que las indicaciones y las contraindicaciones del trasplante cardíaco están en constante cambio, debido principalmente a los avances en los cuidados pre, per y postoperatorios, a los nuevos fármacos y otras novedosas alternativas terapéuticas. La clase funcional (NY HA del paciente es poco precisa para indicar el trasplante cardíaco, por lo que se precisa de otras determinaciones, como el consumo máximo de oxígeno: VO2 máx < 10 ml/kg/min conlleva un mortalidad hospitalaria elevada. Asimismo, la fracción de eyección ventricular izquierda disminuida (FEVI < 20% no debe considerarse como el indicador principal para establecer la indicación de trasplante, siendo necesario valorar otros factores de riesgo preoperatorios. En la última década, la experiencia ha puesto de manifiesto que algunas de las contraindicaciones absolutas, antes vigentes, no siempre deben desaconsejar el trasplante cardíaco.

  10. Standardization work by ASTM and DIN concerning test methods for metallic materials - comparative assessment with regard for practice

    International Nuclear Information System (INIS)

    Gerischer, K.

    1986-01-01

    The article explains the significant role of ASTM and marks out basic elements of the specification system of ASTM standards. Usefulness in practice is taken as the main criterion for the subsequent comparison of ASTM or DIN activities and procedures, and results, for standardization in the field of test methods for metallic materials. The main differences are shown to exist with regard to tropicality of test standards, presentation of useful information and background knowledge, and importance attached to formal questions. ASTM standardization work is shown to be more up-to-date, contain more information, and to be less concerned with formal matters. A closer cooperation between ASTM and DIN is strongly recommended. (orig.) [de

  11. Impact of heat treatment on HSS cutting tool (ASTM A600) and its behaviour during machining of mild steel (ASTM A36)

    Science.gov (United States)

    Afolalu, S. A.; Abioye, O. P.; Salawu, E. Y.; Okokpujie, I. P.; Abioye, A. A.; Omotosho, O. A.; Ajayi., O. O.

    2018-04-01

    Carburization is one the best heat treatment that responded well to hardening with Palm Kernel Shell giving the best hardness value. This work studied the influence of carburization on HSStool(ASTM A600) and its behaviour during machining of mild steel (ASTM A36). Composition of the samples (12 pieces of 180 × 12 × 12 mm) HSS tools were checked using UV-VIS spectrometer and the tools were carburized with PKS at holding temperatures and time of 800, 850, 900, 950 °C and 60,90 120 minutes using muffle furnance. The micro structural analysis, surface and core hardnessof the treated samples gave better results than the untreated samples when checked withsoft driven and optical microscope. It wasalso observed that increase in the feed rate and depth for length of cut of 50 mm significantly reduces the wear progression and thereby gave best machining time at maximum carburizing temperature and time(950 °C / 120 minutes) when it was used to cut mild steelon the lathe machine.

  12. Fretting-corrosion at the modular tapers interface: Inspection of standard ASTM F1875-98.

    Science.gov (United States)

    Bingley, Rachel; Martin, Alan; Manfredi, Olivia; Nejadhamzeeigilani, Mahdiyar; Oladokun, Abimbola; Beadling, Andrew Robert; Siddiqui, Sohail; Anderson, James; Thompson, Jonathan; Neville, Anne; Bryant, Michael

    2018-05-01

    Interest in the degradation mechanisms at the modular tapers interfaces has been renewed due to increased reported cases of adverse reactions to metal debris and the appearance of wear and corrosion at the modular tapers interfaces at revision. Over the past two decades, a lot of research has been expended to understand the degradation mechanisms, with two primary implant loading procedures and orientations used consistently across the literature. ASTM F1875-98 is often used as a guide to understand and benchmark the tribocorrosion processes occurring within the modular tapers interface. This article presents a comparison of the two methods outlined in ASTM F1875-98 as well as a critique of the standard considering the current paradigm in pre-clinical assessment of modular tapers.

  13. A new method to determine J0-integral values (ASTM E 813) without any auxiliary equipment

    International Nuclear Information System (INIS)

    Ullrich, G.; Krompholz, K.

    1987-01-01

    In this contribution the path independent J-integral according to J.R. Rice, respective J.D. Landes and J.A. Begley due to ASTME 813 is calculated by the product J pl = d v J el for 3 point bend type specimen. Here d v is the load point displacement up to the point of the onset of stable crack growth V, which is taken from the load versus load point displacement diagram and J el a value which is equivalent to K 2 /E, where K is the stress intensity factor (ASTME 399) and E is Young's modulus. The advantage of the new procedure is the simplicity of the test arrangement and of the evaluation with the determination of initiation point V without computer or other auxiliary equipment. (orig.) [de

  14. Results of ASTM round robin testing for mode 1 interlaminar fracture toughness of composite materials

    Science.gov (United States)

    Obrien, T. Kevin; Martin, Roderick H.

    1992-01-01

    The results are summarized of several interlaboratory 'round robin' test programs for measuring the mode 1 interlaminar fracture toughness of advanced fiber reinforced composite materials. Double Cantilever Beam (DCB) tests were conducted by participants in ASTM committee D30 on High Modulus Fibers and their Composites and by representatives of the European Group on Fracture (EGF) and the Japanese Industrial Standards Group (JIS). DCB tests were performed on three AS4 carbon fiber reinforced composite materials: AS4/3501-6 with a brittle epoxy matrix; AS4/BP907 with a tough epoxy matrix; and AS4/PEEK with a tough thermoplastic matrix. Difficulties encountered in manufacturing panels, as well as conducting the tests are discussed. Critical issues that developed during the course of the testing are highlighted. Results of the round robin testing used to determine the precision of the ASTM DCB test standard are summarized.

  15. An Evaluation of a Proposed Revision of the ASTM D 1990 Grouping Procedure

    Science.gov (United States)

    Steve P Verrill; James W. Evans; David E. Kretschmann; Cherilyn A. Hatfield

    2013-01-01

    Lum, Taylor, and Zidek have proposed a revised procedure for wood species grouping in ASTM standard D 1990. We applaud the authors’ recognition of the importance of considering a strength distribution’s variability as well as its fifth percentile. However, we have concerns about their proposed method of incorporating this information into a standard. We detail these...

  16. Bending The Spending Curve By Altering Care Delivery Patterns: The Role Of Care Management Within A Pioneer ACO.

    Science.gov (United States)

    Hsu, John; Price, Mary; Vogeli, Christine; Brand, Richard; Chernew, Michael E; Chaguturu, Sreekanth K; Weil, Eric; Ferris, Timothy G

    2017-05-01

    Accountable care organizations (ACOs) appear to lower medical spending, but there is little information on how they do so. We examined the impact of patient participation in a Pioneer ACO and its care management program on rates of emergency department (ED) visits and hospitalizations and on Medicare spending. We used data for the period 2009-14, exploiting naturally staggered program entry to create concurrent controls to help isolate the program effects. The care management program (the ACO's primary intervention) targeted beneficiaries with elevated but modifiable risks for future spending. ACO participation had a modest effect on spending, in line with previous estimates. Participation in the care management program was associated with substantial reductions in rates for hospitalizations and both all and nonemergency ED visits, as well as Medicare spending, when compared to preparticipation levels and to rates and spending for a concurrent sample of beneficiaries who were eligible for but had not yet started the program. Rates of ED visits and hospitalizations were reduced by 6 percent and 8 percent, respectively, and Medicare spending was reduced by 6 percent. Targeting beneficiaries with modifiable high risks and shifting care away from the ED represent viable mechanisms for altering spending within ACOs. Project HOPE—The People-to-People Health Foundation, Inc.

  17. Hardware-efficient signal generation of layered/enhanced ACO-OFDM for short-haul fiber-optic links.

    Science.gov (United States)

    Wang, Qibing; Song, Binhuang; Corcoran, Bill; Boland, David; Zhu, Chen; Zhuang, Leimeng; Lowery, Arthur J

    2017-06-12

    Layered/enhanced ACO-OFDM is a promising candidate for intensity modulation and direct-detection based short-haul fiber-optic links due to its both power and spectral efficiency. In this paper, we firstly demonstrate a hardware-efficient real-time 9.375 Gb/s QPSK-encoded layered/enhanced asymmetrical clipped optical OFDM (L/E-ACO-OFDM) transmitter using a Virtex-6 FPGA. This L/E-ACO-OFDM signal is successfully transmitted over 20-km uncompensated standard single-mode fiber (S-SMF) using a directly modulated laser. Several methods are explored to reduce the FPGA's logic resource utilization by taking advantage of the L/E-ACO-OFDM's signal characteristics. We show that the logic resource occupation of L/E-ACO-OFDM transmitter is almost the same as that of DC-biased OFDM transmitter when they achieve the same spectral efficiency, proving its great potential to be used in a real-time short-haul optical transmission link.

  18. CCR+: Metadata Based Extended Personal Health Record Data Model Interoperable with the ASTM CCR Standard.

    Science.gov (United States)

    Park, Yu Rang; Yoon, Young Jo; Jang, Tae Hun; Seo, Hwa Jeong; Kim, Ju Han

    2014-01-01

    Extension of the standard model while retaining compliance with it is a challenging issue because there is currently no method for semantically or syntactically verifying an extended data model. A metadata-based extended model, named CCR+, was designed and implemented to achieve interoperability between standard and extended models. Furthermore, a multilayered validation method was devised to validate the standard and extended models. The American Society for Testing and Materials (ASTM) Community Care Record (CCR) standard was selected to evaluate the CCR+ model; two CCR and one CCR+ XML files were evaluated. In total, 188 metadata were extracted from the ASTM CCR standard; these metadata are semantically interconnected and registered in the metadata registry. An extended-data-model-specific validation file was generated from these metadata. This file can be used in a smartphone application (Health Avatar CCR+) as a part of a multilayered validation. The new CCR+ model was successfully evaluated via a patient-centric exchange scenario involving multiple hospitals, with the results supporting both syntactic and semantic interoperability between the standard CCR and extended, CCR+, model. A feasible method for delivering an extended model that complies with the standard model is presented herein. There is a great need to extend static standard models such as the ASTM CCR in various domains: the methods presented here represent an important reference for achieving interoperability between standard and extended models.

  19. Ductile fracture toughness of heavy section pressure vessel steel plate. A specimen-size study of ASTM A 533 steels

    International Nuclear Information System (INIS)

    Williams, J.A.

    1979-09-01

    The ductile fracture toughness, J/sub Ic/, of ASTM A 533, Grade B, Class 1 and ASTM A 533, heat treated to simulate irradiation, was determined for 10- to 100-mm thick compact specimens. The toughness at maximum specimen load was also measured to determine the conservatism of J/sub Ic/. The toughness of ASTM A 533, Grade B, Class 1 steel was 349 kJ/m 2 and at the equivalent upper shelf temperature, the heat treated material exhibited 87 kJ/m 2 . The maximum load fracture toughness was found to be linearly proportional to specimen size, and only specimens which failed to meet ASTM size criteria exhibited maximum load toughness less than J/sub Ic/

  20. Domainwise Web Page Optimization Based On Clustered Query Sessions Using Hybrid Of Trust And ACO For Effective Information Retrieval

    Directory of Open Access Journals (Sweden)

    Dr. Suruchi Chawla

    2015-08-01

    Full Text Available Abstract In this paper hybrid of Ant Colony OptimizationACO and trust has been used for domainwise web page optimization in clustered query sessions for effective Information retrieval. The trust of the web page identifies its degree of relevance in satisfying specific information need of the user. The trusted web pages when optimized using pheromone updates in ACO will identify the trusted colonies of web pages which will be relevant to users information need in a given domain. Hence in this paper the hybrid of Trust and ACO has been used on clustered query sessions for identifying more and more relevant number of documents in a given domain in order to better satisfy the information need of the user. Experiment was conducted on the data set of web query sessions to test the effectiveness of the proposed approach in selected three domains Academics Entertainment and Sports and the results confirm the improvement in the precision of search results.

  1. JST Thesaurus Headwords and Synonyms: ASTM [MeCab user dictionary for science technology term[Archive

    Lifescience Database Archive (English)

    Full Text Available MeCab user dictionary for science technology term ASTM 名詞 一般 * * * * 米国材料試験協会 ベイコクザ...イリョウシケンキョウカイ ベイコクザイリョーシケンキョーカイ Thesaurus2015 200906091611619997 C IA02 UNKNOWN_1 ASTM

  2. The development and psychometric validation of an instrument to evaluate nurses' attitudes towards communication with the patient (ACO).

    Science.gov (United States)

    Giménez-Espert, María Del Carmen; Prado-Gascó, Vicente Javier

    2018-05-01

    Patient communication is a key skill for nurses involved in clinical care. Its measurement is a complex phenomenon that can be addressed through attitude evaluation. To develop and psychometrically test a measure of nurses' attitudes towards communication with patients (ACO), to study the relationship between these dimensions, and to analyse nursing attitudes. To develop and psychometrically test the ACO questionnaire. All hospitals in the province of Valencia were invited by e-mail to distribute the ACO instrument. Ten hospitals took part in the study. The study population was composed of a convenience sample of 400 hospital nurses on general or special services. The inclusion criteria were nurses at the selected centres who had previously provided an informed consent to participate. A literature review and expert consultation (N = 10) was used to develop the content of the questionnaire. The 62-item version of the instrument was applied to a convenience sample of 400 nurses between May 2015 and March 2016. Factor structure was evaluated with exploratory and confirmatory factor analysis (EFA, CFA), and reliability was evaluated with Cronbach's alpha, composite reliability (CR), and average variance extracted (AVE). The final instrument (ACO), composed of 25 items grouped into three attitude dimensions (cognitive, affective and behavioural), had good psychometric properties. In the study sample, nurses had a favourable attitude towards communication. The cognitive and affective dimensions of the ACO should be able to predict the behaviour dimension. The ACO is useful for evaluating current clinical practices, identifying educational needs and assessing the effectiveness of communication training or other interventions intended to improve communication. Copyright © 2018 Elsevier Ltd. All rights reserved.

  3. A Family of ACO Routing Protocols for Mobile Ad Hoc Networks

    Science.gov (United States)

    Rupérez Cañas, Delfín; Sandoval Orozco, Ana Lucila; García Villalba, Luis Javier; Kim, Tai-hoon

    2017-01-01

    In this work, an ACO routing protocol for mobile ad hoc networks based on AntHocNet is specified. As its predecessor, this new protocol, called AntOR, is hybrid in the sense that it contains elements from both reactive and proactive routing. Specifically, it combines a reactive route setup process with a proactive route maintenance and improvement process. Key aspects of the AntOR protocol are the disjoint-link and disjoint-node routes, separation between the regular pheromone and the virtual pheromone in the diffusion process and the exploration of routes, taking into consideration the number of hops in the best routes. In this work, a family of ACO routing protocols based on AntOR is also specified. These protocols are based on protocol successive refinements. In this work, we also present a parallelized version of AntOR that we call PAntOR. Using programming multiprocessor architectures based on the shared memory protocol, PAntOR allows running tasks in parallel using threads. This parallelization is applicable in the route setup phase, route local repair process and link failure notification. In addition, a variant of PAntOR that consists of having more than one interface, which we call PAntOR-MI (PAntOR-Multiple Interface), is specified. This approach parallelizes the sending of broadcast messages by interface through threads. PMID:28531159

  4. A Family of ACO Routing Protocols for Mobile Ad Hoc Networks.

    Science.gov (United States)

    Rupérez Cañas, Delfín; Sandoval Orozco, Ana Lucila; García Villalba, Luis Javier; Kim, Tai-Hoon

    2017-05-22

    In this work, an ACO routing protocol for mobile ad hoc networks based on AntHocNet is specified. As its predecessor, this new protocol, called AntOR, is hybrid in the sense that it contains elements from both reactive and proactive routing. Specifically, it combines a reactive route setup process with a proactive route maintenance and improvement process. Key aspects of the AntOR protocol are the disjoint-link and disjoint-node routes, separation between the regular pheromone and the virtual pheromone in the diffusion process and the exploration of routes, taking into consideration the number of hops in the best routes. In this work, a family of ACO routing protocols based on AntOR is also specified. These protocols are based on protocol successive refinements. In this work, we also present a parallelized version of AntOR that we call PAntOR. Using programming multiprocessor architectures based on the shared memory protocol, PAntOR allows running tasks in parallel using threads. This parallelization is applicable in the route setup phase, route local repair process and link failure notification. In addition, a variant of PAntOR that consists of having more than one interface, which we call PAntOR-MI (PAntOR-Multiple Interface), is specified. This approach parallelizes the sending of broadcast messages by interface through threads.

  5. Slow strain rate stress corrosion tests on A508-III and A533B steel in de-ionized and PWR water at 563K

    International Nuclear Information System (INIS)

    Hurst, P.; Appleton, D.A.; Banks, P.; Raffel, A.S.

    1985-01-01

    An experimental programme is being undertaken to assess the extent to which PWR pressure vessel steels, including weldments, may be susceptible to stress corrosion cracking under relevant water chemistry and flow rate conditions. Initial results from slow strain rate tests on parent A533B and A508-III steels together with a weldment are described. No susceptibility to stress corrosion was observed for either steel, when tested in the rolling (L) direction, at a potential characteristic of normal quality PWR water. For cracking to occur on such specimens the potential must be displaced by 400 to 500 mV in the positive direction, requiring (in the case of high flow de-ionized water) the presence of ca 200 ppb oxygen. Some cracking was observed on transverse (S) direction specimens in water containing 2 , indicating that there may be micro-structural features which can cause cracking even in low oxygen water. This orientation is not directly relevant to pressure vessels and the cracking may only arise as a consequence of the deformation encountered in the slow strain rate test. (author)

  6. The fracture mechanical significance of cracks formed during stress-relief annealing of a submerged arc weldment in pressure vessel steel of type A508 class 2

    International Nuclear Information System (INIS)

    Liljestrand, L.-G.; Oestberg, G.

    1978-01-01

    In large weldments of type A508 C12 cracks can form in the heat-affected zone during stress-relief annealing. The significance of such cracks with respect to catastrophic fracture is of interest from the point of view of safety, in particular for nuclear pressure vessels. In this investigation the size of reheat cracks, as formed and after fatigue growth, has been compared with the critical size for fast fracture. The latter was assessed by determination of the toughness of the heat-affected zones. The fracture toughness of the heat-affected zones did not differ much from that of the parent material. The presence of microcracks reduced the fracture toughness (of a special type of simulated specimen) at 20 0 C by about 20%. The fracture mechanical evaluation indicates that the cracks formed during stress-relief annealing should not impair the safety of the vessel under normal conditions, except for particular geometries and when the cracks may rapidly link together during fatigue. (author)

  7. ASTM international workshop on standards and measurements for tissue engineering scaffolds.

    Science.gov (United States)

    Simon, Carl G; Yaszemski, Michael J; Ratcliffe, Anthony; Tomlins, Paul; Luginbuehl, Reto; Tesk, John A

    2015-07-01

    The "Workshop on Standards & Measurements for Tissue Engineering Scaffolds" was held on May 21, 2013 in Indianapolis, IN, and was sponsored by the ASTM International (ASTM). The purpose of the workshop was to identify the highest priority items for future standards work for scaffolds used in the development and manufacture of tissue engineered medical products (TEMPs). Eighteen speakers and 78 attendees met to assess current scaffold standards and to prioritize needs for future standards. A key finding was that the ASTM TEMPs subcommittees (F04.41-46) have many active "guide" documents for educational purposes, but few standard "test methods" or "practices." Overwhelmingly, the most clearly identified need was standards for measuring the structure of scaffolds, followed by standards for biological characterization, including in vitro testing, animal models and cell-material interactions. The third most pressing need was to develop standards for assessing the mechanical properties of scaffolds. Additional needs included standards for assessing scaffold degradation, clinical outcomes with scaffolds, effects of sterilization on scaffolds, scaffold composition, and drug release from scaffolds. Discussions highlighted the need for additional scaffold reference materials and the need to use them for measurement traceability. Workshop participants emphasized the need to promote the use of standards in scaffold fabrication, characterization, and commercialization. Finally, participants noted that standards would be more broadly accepted if their impact in the TEMPs community could be quantified. Many scaffold standard needs have been identified and focus is turning to generating these standards to support the use of scaffolds in TEMPs. © 2014 Wiley Periodicals, Inc.

  8. ASTM STANDARD GUIDE FOR EVALUATING DISPOSAL OPTIONS FOR REUSE OF CONCRETE FROM NUCLEAR FACILITY DECOMMISSIONING

    International Nuclear Information System (INIS)

    Phillips, Ann Marie; Meservey, Richard H.

    2003-01-01

    Within the nuclear industry, many contaminated facilities that require decommissioning contain huge volumes of concrete. This concrete is generally disposed of as low-level waste at a high cost. Much of the concrete is lightly contaminated and could be reused as roadbed, fill material, or aggregate for new concrete, thus saving millions of dollars. However, because of the possibility of volumetric contamination and the lack of a method to evaluate the risks and costs of reusing concrete, reuse is rarely considered. To address this problem, Argonne National Laboratory-East (ANL-E) and the Idaho National Engineering and Environmental Laboratory teamed to write a ''concrete protocol'' to help evaluate the ramifications of reusing concrete within the U.S. Department of Energy (DOE). This document, titled the Protocol for Development of Authorized Release Limits for Concrete at U.S. Department of Energy Site (1) is based on ANL-E's previously developed scrap metal recycle protocols; on the 10-step method outlined in DOE's draft handbook, Controlling Release for Reuse or Recycle of Property Containing Residual Radioactive Material (2); and on DOE Order 4500.5, Radiation Protection of the Public and the Environment (3). The DOE concrete protocol was the basis for the ASTM Standard Guide for Evaluating Disposal Options for Concrete from Nuclear Facility Decommissioning, which was written to make the information available to a wider audience outside DOE. The resulting ASTM Standard Guide is a more concise version that can be used by the nuclear industry worldwide to evaluate the risks and costs of reusing concrete from nuclear facility decommissioning. The bulk of the ASTM Standard Guide focuses on evaluating the dose and cost for each disposal option. The user calculates these from the detailed formulas and tabulated data provided, then compares the dose and cost for each disposal option to select the best option that meets regulatory requirements. With this information

  9. Systematic Approach to Design Tailor Made Fuel Blends That Meets ASTM Standards

    DEFF Research Database (Denmark)

    Intikhab, S.; Kalakul, Sawitree; H., Choudhury

    2015-01-01

    point, vapor pressure, and heat content were determined using analytical instruments according to their respective American Society for Testing and Materials (ASTM) standards. Most of the properties complied well with the industry standards. However, model gasoline had a comparatively low RVP....... On the other hand, model diesel had a significantly higher cloud point and pour point than what is recommended. This deviation will have an impact on the cold flow properties of the fuels. For both fuels, different additives along with their composition have also been determined using the same computational...

  10. Impact of ASTM Standard E722 update on radiation damage metrics

    Energy Technology Data Exchange (ETDEWEB)

    DePriest, Kendall Russell [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2014-06-01

    The impact of recent changes to the ASTM Standard E722 is investigated. The methodological changes in the production of the displacement kerma factors for silicon has significant impact for some energy regions of the 1-MeV(Si) equivalent fluence response function. When evaluating the integral over all neutrons energies in various spectra important to the SNL electronics testing community, the change in the response results in an increase in the total 1-MeV(Si) equivalent fluence of 2 7%. Response functions have been produced and are available for users of both the NuGET and MCNP codes.

  11. Assessment of wrought ASTM F1058 cobalt alloy properties for permanent surgical implants.

    Science.gov (United States)

    Clerc, C O; Jedwab, M R; Mayer, D W; Thompson, P J; Stinson, J S

    1997-01-01

    The behavior of the ASTM F1058 wrought cobalt-chromium-nickel-molybdenum-iron alloy (commonly referred to as Elgiloy or Phynox) is evaluated in terms of mechanical properties, magnetic resonance imaging, corrosion resistance, and biocompatibility. The data found in the literature, the experimental corrosion and biocompatibility results presented in this article, and its long track record as an implant material demonstrate that the cobalt superalloy is an appropriate material for permanent surgical implants that require high yield strength and fatigue resistance combined with high elastic modulus, and that it can be safely imaged with magnetic resonance.

  12. Glove powder's carrying capacity for latex protein: analysis using the ASTM ELISA test.

    Science.gov (United States)

    Beezhold, D; Horton, K; Hickey, V; Daddona, J; Kostyal, D

    2003-01-01

    Glove donning powders carry latex proteins and disperse them into the workplace environment. We have used the ASTM D6499 ELISA to quantify the amount of latex antigen bound to and carried by glove powders. We could differentiate between a small amount of protein actually bound to the powders and a larger amount carried by the powder. Enhanced binding of a major allergen, Hev b 5, to the starch powders was demonstrated by Western blot. The D6499 ELISA is able to measure total latex antigen, soluble and powder bound, simultaneously without the need to centrifuge the samples.

  13. Application of ASTM E-1559 Apparatus to Study H2O Desorption

    Science.gov (United States)

    Woronowicz, Michael; Perry, Radford, III; Meadows, George A.

    2015-01-01

    The NASA James Webb Space Telescope project identified a need to measure water vapor desorption from cryogenic surfaces in order to validate predictions of spacecraft design performance. A review of available scientific literature indicated no such measurements had been reported below 131 K. Contamination control personnel at NASA Goddard Space Flight Center recognized the possibility they readily possessed the means to collect these measurements at lower temperatures using an existing apparatus commonly employed for making outgassing observations. This presentation will relate how the ASTM E-1559 Molekit apparatus was used without physical modification to measure water vapor sublimation down to 120 K and compare this data to existing equilibrium vapor pressure models.

  14. Data development for ASTM E24.06.02 round robin program on instability prediction

    Science.gov (United States)

    Mccabe, D. E.

    1979-01-01

    Basis data for use in an ASTM E24.06.02 task group round robin activity was developed. Compact specimens were made of 2024-T351, 7075-T651 aluminum alloys, and 304 stainless steel. All were 12.7 mm thick and planar dimension variables incorporated were for 1T, 2T and 4T sizes. Representative raw data for each material and specimen size are contained herein. R-curves plotted in terms of delta a physical and delta a effective are plotted for each material.

  15. Mechanical behaviour of Astm A 297 grade Hp joints welded using different processes

    International Nuclear Information System (INIS)

    Emygdio, Paulo Roberto Oliveira; Zeemann, Annelise; Almeida, Luiz Henrique de

    1996-01-01

    The influence of different arc welding processes on mechanical behaviour was studied for cast heat resistant stainless steel welded joints, in the as welded conditions. ASTM A 297 grade HP with niobium and niobium/titanium additions were welded following three different welding procedures, using shielded metal arc welding gas tungsten arc welding and plasma arc welding, in six welded joints. The welded joint mechanical behaviour was evaluated by ambient temperature and 870 deg C tensile tests; and creep tests at 900 deg C and 50 MPa. Mechanical test results showed that the welding procedure qualification following welding codes is not suitable for high temperature service applications. (author)

  16. NHETS - Estudo de Necrópsias de Pacientes Submetidos a Transplante Cardíaco

    Directory of Open Access Journals (Sweden)

    Thiago Ninck Valette

    2014-06-01

    Full Text Available Fundamento: Discordâncias entre diagnóstico pre e post-mortem são relatadas na literatura, podendo variar de 4,1 a 49,8% dentre os casos encaminhados para exame necroscópico, com importante repercussão no tratamento dos pacientes. Objetivo: Analisar pacientes com óbito após o transplante cardíaco e confrontar os diagnósticos pre e post-mortem. Métodos: Por meio da revisão de prontuários, foram analisados dados clínicos, presença de comorbidades, esquema de imunossupressão, exames laboratoriais, causa clínica do óbito e causa do óbito à necrópsia. Foram confrontadas, então, a causa clínica e a causa necroscópica do óbito de cada paciente. Resultados: Foram analisados 48 óbitos submetidos à necrópsia no período de 2000 a 2010; 29 (60,4% tiveram diagnósticos clínico e necroscópico concordantes, 16 (33,3% tiveram diagnósticos discordantes e três (6,3% tiveram diagnóstico não esclarecido. Entre os discordantes, 15 (31,3% apresentaram possível impacto na sobrevida e um (2,1% não apresentou impacto na sobrevida. O principal diagnóstico clínico feito equivocadamente foi o de infecção, com cinco casos (26,7% dos discordantes, seguido por rejeição hiperaguda, com quatro casos (20% dos discordantes, e tromboembolismo pulmonar, com três casos (13,3% dos discordantes. Conclusão: Discordâncias entre o diagnóstico clínico e achados da necrópsia são comumente encontradas no transplante cardíaco. Novas estratégias no aperfeiçoamento do diagnóstico clínico devem ser introduzidas, considerando-se os resultados da necrópsia para melhoria do tratamento da insuficiência cardíaca por meio do transplante cardíaco.

  17. Dynamic Fuzzy Logic Parameter Tuning for ACO and Its Application in the Fuzzy Logic Control of an Autonomous Mobile Robot

    Directory of Open Access Journals (Sweden)

    Oscar Castillo

    2013-01-01

    Full Text Available Ant Colony Optimization (ACO is a population-based constructive meta-heuristic that exploits a form of past performance memory inspired by the foraging behaviour of real ants. The behaviour of the ACO algorithm is highly dependent on the values defined for its parameters. Adaptation and parameter control are recurring themes in the field of bio-inspired algorithms. The present paper explores a new approach to diversity control in ACO. The central idea is to avoid or slow down full convergence through the dynamic variation of certain parameters. The performance of different variants of the ACO algorithm was observed to choose one as the basis for the proposed approach. A convergence fuzzy logic controller with the objective of maintaining diversity at some level to avoid premature convergence was created. Encouraging results have been obtained on its application to the design of fuzzy controllers. In particular, the optimization of membership functions for a unicycle mobile robot trajectory control is presented with the proposed method.

  18. Integrating Medication Therapy Management (MTM Services Provided by Community Pharmacists into a Community-Based Accountable Care Organization (ACO

    Directory of Open Access Journals (Sweden)

    Brian Isetts

    2017-10-01

    Full Text Available (1 Background: As the U.S. healthcare system evolves from fee-for-service financing to global population-based payments designed to be accountable for both quality and total cost of care, the effective and safe use of medications is gaining increased importance. The purpose of this project was to determine the feasibility of integrating medication therapy management (MTM services provided by community pharmacists into the clinical care teams and the health information technology (HIT infrastructure for Minnesota Medicaid recipients of a 12-county community-based accountable care organization (ACO. (2 Methods: The continuous quality improvement evaluation methodology employed in this project was the context + mechanism = outcome (CMO model to account for the fact that programs only work insofar as they introduce promising ideas, solutions and opportunities in the appropriate social and cultural contexts. Collaborations between a 12-county ACO and 15 community pharmacies in Southwest Minnesota served as the social context for this feasibility study of MTM referrals to community pharmacists. (3 Results: All 15 community pharmacy sites were integrated into the HIT infrastructure through Direct Secure Messaging, and there were 32 recipients who received MTM services subsequent to referrals from the ACO at 5 of the 15 community pharmacies over a 1-year implementation phase. (4 Conclusion: At the conclusion of this project, an effective electronic communication and MTM referral system was activated, and consideration was given to community pharmacists providing MTM in future ACO shared savings agreements.

  19. Trasplante cardíaco en pacientes con enfermedad de Chagas. Experiencia de un único centro

    Directory of Open Access Journals (Sweden)

    Alfredo Inácio Fiorelli

    2011-07-01

    Conclusiones: El trasplante cardíaco es el único tratamiento actual eficaz de tratamiento de la enfermedad de Chagas en fase terminal. La reactivación de la enfermedad es un problema real que es fácilmente revertido con la introducción de la terapéutica farmacológica específica, restaurando los padrones histológicos del miocardio sin dejar secuelas. La inmunosupresión, en especial los corticoides, predisponen al desarrollo de neoplasias y a la reactivación de la enfermedad, exigiendo una atención especial su interrupción o reducción precoz.

  20. Transfer function fitting using a continuous Ant Colony Optimization (ACO algorithm

    Directory of Open Access Journals (Sweden)

    A. Reineix

    2015-03-01

    Full Text Available An original approach is proposed in order to achieve the  fitting of ultra-wideband complex frequency functions, such  as the complex impedances, by using the so-called ACO  (Ant Colony Optimization methods. First, we present the  optimization principle of ACO, which originally was  dedicated to the combinatorial problems. Further on, the  extension to the continuous and mixed problems is  explained in more details. The interest in this approach is  proved by its ability to define practical constraints and  objectives, such as minimizing the number of filters used in  the model with respect to a fixed relative error. Finally, the  establishment of the model for the first and second order  filter types illustrates the power of the method and its  interest for the time-domain electromagnetic computation.

  1. Multi-criteria ACO-based Algorithm for Ship’s Trajectory Planning

    Directory of Open Access Journals (Sweden)

    Agnieszka Lazarowska

    2017-03-01

    Full Text Available The paper presents a new approach for solving a path planning problem for ships in the environment with static and dynamic obstacles. The algorithm utilizes a heuristic method, classified to the group of Swarm Intelligence approaches, called the Ant Colony Optimization. The method is inspired by a collective behaviour of ant colonies. A group of agents - artificial ants searches through the solution space in order to find a safe, optimal trajectory for a ship. The problem is considered as a multi-criteria optimization task. The criteria taken into account during problem solving are: path safety, path length, the International Regulations for Preventing Collisions at Sea (COLREGs compliance and path smoothness. The paper includes the description of the new multi-criteria ACO-based algorithm along with the presentation and discussion of simulation tests results.

  2. Controlling‏ ‏the Balance of Exploration and ‎Exploitation in ACO Algorithm ‎

    Directory of Open Access Journals (Sweden)

    Ayad ‎ Mohammed Jabbar

    2018-02-01

    Full Text Available Ant colony optimization is a meta-heuristic algorithm inspired by the foraging behavior of real ant colony. The algorithm is a population-based solution employed in different optimization problems such as classification, image processing, clustering, and so on. This paper sheds the light on the side of improving the results of traveling salesman problem produced by the algorithm. The key success that produces the valuable results is due to the two important components of exploration and exploitation. Balancing both components is the foundation of controlling search within the ACO. This paper proposes to modify the main probabilistic method to overcome the drawbacks of the exploration problem and produces global optimal results in high dimensional space. Experiments on six variant of ant colony optimization indicate that the proposed work produces high-quality results in terms of shortest route

  3. Changes in health care spending and quality for Medicare beneficiaries associated with a commercial ACO contract.

    Science.gov (United States)

    McWilliams, J Michael; Landon, Bruce E; Chernew, Michael E

    2013-08-28

    In a multipayer system, new payment incentives implemented by one insurer for an accountable care organization (ACO) may also affect spending and quality of care for another insurer's enrollees served by the ACO. Such spillover effects reflect the extent of organizational efforts to reform care delivery and can contribute to the net impact of ACOs. We examined whether the Blue Cross Blue Shield (BCBS) of Massachusetts' Alternative Quality Contract (AQC), an early commercial ACO initiative associated with reduced spending and improved quality for BCBS enrollees, was also associated with changes in spending and quality for Medicare beneficiaries, who were not covered by the AQC. Quasi-experimental comparisons from 2007-2010 of elderly fee-for-service Medicare beneficiaries in Massachusetts (1,761,325 person-years) served by 11 provider organizations entering the AQC in 2009 or 2010 (intervention group) vs beneficiaries served by other providers (control group). Using a difference-in-differences approach, we estimated changes in spending and quality for the intervention group in the first and second years of exposure to the AQC relative to concurrent changes for the control group. Regression and propensity score methods were used to adjust for differences in sociodemographic and clinical characteristics. The primary outcome was total quarterly medical spending per beneficiary. Secondary outcomes included spending by setting and type of service, 5 process measures of quality, potentially avoidable hospitalizations, and 30-day readmissions. Before entering the AQC, total quarterly spending per beneficiary for the intervention group was $150 (95% CI, $25-$274) higher than for the control group and increased at a similar rate. In year 2 of the intervention group's exposure to the AQC, this difference was reduced to $51 (95% CI, -$109 to $210; P = .53), constituting a significant differential change of -$99 (95% CI, -$183 to -$16; P = .02) or a 3.4% savings

  4. Application of MCDM based hybrid optimization tool during turning of ASTM A588

    Directory of Open Access Journals (Sweden)

    Himadri Majumder

    2017-07-01

    Full Text Available Multi-criteria decision making approach is one of the most troublesome tools for solving the tangled optimization problems in the machining area due to its capability of solving the complex optimization problems in the production process. Turning is widely used in the manufacturing processes as it offers enormous advantages like good quality product, customer satisfaction, economical and relatively easy to apply. A contemporary approach, MOORA coupled with PCA, was used to ascertain an optimal combination of input parameters (spindle speed, depth of cut and feed rate for the given output parameters (power consumption, average surface roughness and frequency of tool vibration using L27 orthogonal array for turning on ASTM A588 mild steel. Comparison between MOORA-PCA and TOPSIS-PCA shows the effectiveness of MOORA over TOPSIS method. The optimum parameter combination for multi-performance characteristics has been established for ASTM A588 mild steel are spindle speed 160 rpm, depth of cut 0.1 mm and feed rate 0.08 mm/rev. Therefore, this study focuses on the application of the hybrid MCDM approach as a vital selection making tool to deal with multi objective optimization problems.

  5. A Knowledge- Based Computer System for UO2 Characterization According to ASTM Requirements

    International Nuclear Information System (INIS)

    Afifi, Y.K.; El-Hakim, E.

    2000-01-01

    The uranium dioxde (UO 2 ) powder properties and the pellets fabrication processes determine the characteristics of the sintered UO 2 pellets. The powder properties include chemical and physical characteristics. The physical and chemical properties of UO 2 powder are normally checked to ensure consistency and reproducibility of the sintered UO 2 pellets. Powder characteristics are known to influence the subsequent manufacturing performance or the fuel properties. The aim of this paper is to provide the nuclear industry with a program dealing with the processes and the related requirements to determine the specifications of UO 2 powder according to the American Standards for Testing and Materials (ASTM). This program covers the physical and chemical characteristics of UO 2 powder. A group of logic flow charts dealing with the data and information available in the ASTM for each step in the characterization of UO 2 powder process and the technical assistance are constructed. These logic flow charts are collected to form a module of the software to qualify the UO 2 powder. The program contains 8 modules, each one deals with one object. This program saves time, is also considered as a collective schema for all the required UO 2 powder characterization and the related processes, and could be used as a training tool for less skilled personnel involved in UO 2 powder characterization laboratories

  6. Relation between the national handbook of recommended methods for water data acquisition and ASTM standards

    Science.gov (United States)

    Glysson, G. Douglas; Skinner, John V.

    1991-01-01

    In the late 1950's, intense demands for water and growing concerns about declines in the quality of water generated the need for more water-resources data. About thirty Federal agencies, hundreds of State, county and local agencies, and many private organizations had been collecting water data. However, because of differences in procedures and equipment, many of the data bases were incompatible. In 1964, as a step toward establishing more uniformity, the Bureau of the Budget (now the Office of Management and Budget, OMB) issued 'Circular A-67' which presented guidelines for collecting water data and also served as a catalyst for creating the Office of Water Data Coordination (OWDC) within the U.S. Geological Survey. This paper discusses past, present, and future aspects of the relation between methods in the National Handbook and standards published by ASTM (American Society for Testing and Materials) Committee D-19 on Water's Subcommittee D-19.07 on Sediment, Geomorphology, and Open Channel Flow. The discussion also covers historical aspects of standards - development work jointly conducted by OWDC and ASTM.

  7. Improved ASTM G72 Test Method for Ensuring Adequate Fuel-to-Oxidizer Ratios

    Science.gov (United States)

    Juarez, Alfredo; Harper, Susana Tapia

    2016-01-01

    The ASTM G72/G72M-15 Standard Test Method for Autogenous Ignition Temperature of Liquids and Solids in a High-Pressure Oxygen-Enriched Environment is currently used to evaluate materials for the ignition susceptibility driven by exposure to external heat in an enriched oxygen environment. Testing performed on highly volatile liquids such as cleaning solvents has proven problematic due to inconsistent test results (non-ignitions). Non-ignition results can be misinterpreted as favorable oxygen compatibility, although they are more likely associated with inadequate fuel-to-oxidizer ratios. Forced evaporation during purging and inadequate sample size were identified as two potential causes for inadequate available sample material during testing. In an effort to maintain adequate fuel-to-oxidizer ratios within the reaction vessel during test, several parameters were considered, including sample size, pretest sample chilling, pretest purging, and test pressure. Tests on a variety of solvents exhibiting a range of volatilities are presented in this paper. A proposed improvement to the standard test protocol as a result of this evaluation is also presented. Execution of the final proposed improved test protocol outlines an incremental step method of determining optimal conditions using increased sample sizes while considering test system safety limits. The proposed improved test method increases confidence in results obtained by utilizing the ASTM G72 autogenous ignition temperature test method and can aid in the oxygen compatibility assessment of highly volatile liquids and other conditions that may lead to false non-ignition results.

  8. ASTM clustering for improving coal analysis by near-infrared spectroscopy.

    Science.gov (United States)

    Andrés, J M; Bona, M T

    2006-11-15

    Multivariate analysis techniques have been applied to near-infrared (NIR) spectra coals to investigate the relationship between nine coal properties (moisture (%), ash (%), volatile matter (%), fixed carbon (%), heating value (kcal/kg), carbon (%), hydrogen (%), nitrogen (%) and sulphur (%)) and the corresponding predictor variables. In this work, a whole set of coal samples was grouped into six more homogeneous clusters following the ASTM reference method for classification prior to the application of calibration methods to each coal set. The results obtained showed a considerable improvement of the error determination compared with the calibration for the whole sample set. For some groups, the established calibrations approached the quality required by the ASTM/ISO norms for laboratory analysis. To predict property values for a new coal sample it is necessary the assignation of that sample to its respective group. Thus, the discrimination and classification ability of coal samples by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) in the NIR range was also studied by applying Soft Independent Modelling of Class Analogy (SIMCA) and Linear Discriminant Analysis (LDA) techniques. Modelling of the groups by SIMCA led to overlapping models that cannot discriminate for unique classification. On the other hand, the application of Linear Discriminant Analysis improved the classification of the samples but not enough to be satisfactory for every group considered.

  9. Cavitation erosion - corrosion behaviour of ASTM A27 runner steel in natural river water

    International Nuclear Information System (INIS)

    Tôn-Thât, L

    2014-01-01

    Cavitation erosion is still one of the most important degradation modes in hydraulic turbine runners. Part of researches in this field focuses on finding new materials, coatings and surface treatments to improve the resistance properties of runners to this phenomenon. However, only few studies are focused on the deleterious effect of the environment. Actually, in some cases a synergistic effect between cavitation erosion mechanisms and corrosion kinetics can establish and increase erosion rate. In the present study, the cavitation erosion-corrosion behaviour of ASTM A27 steel in natural river water is investigated. This paper state the approach which has been used to enlighten the synergy between both phenomena. For this, a 20 kHz vibratory test according ASTM G32 standard is coupled to an electrochemical cell to be able to follow the different corrosion parameters during the tests to get evidence of the damaging mechanism. Moreover, mass losses have been followed during the exposure time. The classical degradation parameters (cumulative weight loss and erosion rate) are determined. Furthermore, a particular effort has been implemented to determine the evolution of surface damages in terms of pitting, surface cracking, material removal and surface corrosion. For this, scanning electron microscopy has been used to link the microstructure to the material removal mechanisms

  10. Weldability examination of ASTM A 240 S41500 martensitic stainless steel by thermal cycles simulation testings

    Directory of Open Access Journals (Sweden)

    Alberto Velázquez-del Rosario

    2015-07-01

    Full Text Available The weldability assets of ASTM A 240 S41500 (ASTM A 240/A 240M martensitic stainless steel are presented through the study of the effects of single and double thermal weld cycles on mechanical properties and microstructure of base metal (BM and the artificial heat affected zone (HAZ created by thermal weld simulations. For single cycles, separate peak temperatures of 1000 ºC/12 s and 1350 ºC/12 s (cooling times: 12 s in both cases were evaluated, whilst two combinations of peak temperatures: (1350 ºC/5 s + 1000 ºC/5 s ºC and (1350 ºC/12 s + 1000 ºC/12 s ºC (cooling times: 5 s and 12 s, were applied for double cycles. Post weld heat treatment (PWHT with short and long holding times were applied and Vickers hardness, impact toughness and metallographic examinations were used in order to assess mechanical and metallographic properties in the as-simulated (no heat treated and postweld heat treated conditions. Best properties of the welded joint for double thermal weld cycles with long holding times were reached, which reveals the good weldability and applicability of the tested material in post weld heat treated conditions.

  11. Chronic ankle pain and fibrosis successfully treated with a new noninvasive augmented soft tissue mobilization technique (ASTM): a case report.

    Science.gov (United States)

    Melham, T J; Sevier, T L; Malnofski, M J; Wilson, J K; Helfst, R H

    1998-06-01

    This clinical case report demonstrates the clinical effectiveness of a new form of soft tissue mobilization in the treatment of excessive connective tissue fibrosis (scar tissue) around an athlete's injured ankle. The scar tissue was causing the athlete to have pain with activity, pain on palpation of the ankle, decreased range of motion, and loss of function. Surgery and several months of conventional physical therapy failed to alleviate the athlete's symptoms. As a final resort, augmented soft tissue mobilization (ASTM) was administered. ASTM is an alternative nonsurgical treatment modality that is being researched at Performance Dynamics (Muncip, IN). ASTM is a process that uses ergonomically designed instruments that assist therapists in the rapid localization and effective treatment of areas exhibiting excessive soft tissue fibrosis. This is followed by a stretching and strengthening program. Upon the completion of 6 wk of ASTM therapy, the athlete had no pain and had regained full range of motion and function. This case report is an example of how a noninvasive augmented form of soft tissue mobilization (ASTM) demonstrated impressive clinical results in treating a condition caused by connective tissue fibrosis.

  12. The role of the American Society for Testing and Materials (ASTM) in providing standards to support reliability technology for nuclear power plants

    International Nuclear Information System (INIS)

    Steele, L.E.

    1978-01-01

    ASTM is an international society for managing the development of standards on characteristics and performance of materials, products, systems and services and the promotion of related knowledge. This paper provides on overview of ASTM, emphasizing its contribution to nuclear systems reliability. In so doing, the author, from his perspective as chairman of ASTM committee E 10 on ''Nuclear Applications and the Measurement of Radiation Effects and the Committee on Standards'', illustrates ASTM contributions to the understanding and control of radiation embrittlement of light-water reactor pressure vessels. Four major related taks are summarized and pertinent standards identified. These include: (1) surveillance practice (5 standards), (2) neutron dosimetry (8 standards), (3) specification for steels for nuclear service (7 standards) and (4) basic guidelines for thermal annealing to correct radiation embrittlement (1 standard). This illustration, a specific accomplishment using ASTM standards, is cited within the context of the broader nuclear-related activities of ASTM. (author)

  13. Interdisciplinariedade: entre o desejo e a prática dos profissionais do transplante cardíaco no Instituto Dante Pazzanese de Cardiologia

    OpenAIRE

    Santos, Nadja Maria Codá dos

    2005-01-01

    Esta dissertação tem o objetivo geral de: analisar a prática interdisciplinar nos 13 anos de transplante cardíaco no Instituto Dante Pazzanese de Cardiologia IDPC. Buscou como objetivos específicos: resgatar a história do transplante cardíaco no IDPC; analisar as perspectivas dos profissionais sobre a contribuição de sua profissão e das demais para o trabalho interdisciplinar; estudar contribuição do Serviço Social para a prática interdisciplinar. Na prática do transplante cardíaco, inserid...

  14. Summary: Update to ASTM guide E 1523 to charge control and charge referencing techniques in x-ray photoelectron spectroscopy

    International Nuclear Information System (INIS)

    Baer, D.R.

    2005-01-01

    An updated version of the American Society for Testing and Materials (ASTM) guide E 1523 to the methods to charge control and charge referencing techniques in x-ray photoelectron spectroscopy has been released by ASTM [Annual Book of ASTM Standards Surface Analysis (American Society for Testing and Materials, West Conshohocken, PA, 2004), Vol. 03.06]. The guide is meant to acquaint x-ray photoelectron spectroscopy (XPS) users with the various charge control and charge referencing techniques that are and have been used in the acquisition and interpretation of XPS data from surfaces of insulating specimens. The current guide has been expanded to include new references as well as recommendations for reporting information on charge control and charge referencing. The previous version of the document had been published in 1997 [D. R. Baer and K. D. Bomben, J. Vac. Sci. Technol. A 16, 754 (1998)

  15. White Paper Summary of 2nd ASTM International Workshop on Hydrides in Zirconium Alloy Cladding

    Energy Technology Data Exchange (ETDEWEB)

    Sindelar, R. [Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL); Louthan, M. [Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL); PNNL, B. [Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)

    2015-05-29

    This white paper recommends that ASTM International develop standards to address the potential impact of hydrides on the long term performance of irradiated zirconium alloys. The need for such standards was apparent during the 2nd ASTM International Workshop on Hydrides in Zirconium Alloy Cladding and Assembly Components, sponsored by ASTM International Committee C26.13 and held on June 10-12, 2014, in Jackson, Wyoming. The potentially adverse impacts of hydrogen and hydrides on the long term performance of irradiated zirconium-alloy cladding on used fuel were shown to depend on multiple factors such as alloy chemistry and processing, irradiation and post irradiation history, residual and applied stresses and stress states, and the service environment. These factors determine the hydrogen content and hydride morphology in the alloy, which, in turn, influence the response of the alloy to the thermo-mechanical conditions imposed (and anticipated) during storage, transport and disposal of used nuclear fuel. Workshop presentations and discussions showed that although hydrogen/hydride induced degradation of zirconium alloys may be of concern, the potential for occurrence and the extent of anticipated degradation vary throughout the nuclear industry because of the variations in hydrogen content, hydride morphology, alloy chemistry and irradiation conditions. The tools and techniques used to characterize hydrides and hydride morphologies and their impacts on material performance also vary. Such variations make site-to-site comparisons of test results and observations difficult. There is no consensus that a single material or system characteristic (e.g., reactor type, burnup, hydrogen content, end-of life stress, alloy type, drying temperature, etc.) is an effective predictor of material response during long term storage or of performance after long term storage. Multi-variable correlations made for one alloy may not represent the behavior of another alloy exposed to

  16. Hardness optimization of boride diffusion layer on Astm F-75 alloy using response surface methodology

    Energy Technology Data Exchange (ETDEWEB)

    Arguelles O, J. L.; Corona R, M. A. [Universidad Autonoma de San Luis Potosi, Doctorado Institucional en Ingenieria y Ciencia de Materiales, San Luis Potosi 78000, SLP (Mexico); Marquez H, A.; Saldana R, A. L.; Saldana R, A. [Universidad de Guanajuato, Ingenieria Mecanica Agricola DICIVA, Irapuato, Guanajuato 36500 (Mexico); Moreno P, J., E-mail: amarquez@ugto.mx [Universidad de Guanajuato, Departamento de Minas, Metalurgia y Geologia, Ex-Hacienda San Matias s/n, Guanajuato, Guanajuato 36020 (Mexico)

    2017-11-01

    In this study, the Response Surface Methodology (Rsm) and Central Composite Design (Ccd) were used to optimize the hardness of boride diffusion layer on Astm F-75 alloy (also called Haynes alloy). A boronizing thermochemical treatment was carried out at different temperatures and for different time periods. Hardness tests were conducted. The boride diffusion layer was verified by the X-ray diffraction (XRD) analysis indicating the formation of Co B, Co{sub 2}B, Cr B and Mo{sub 2}B phases. An optimal hardness of 3139.7 Hv was obtained for the samples subjected to the boriding process for a duration of 6.86 h at 802.4 degrees Celsius. (Author)

  17. Corrosion resistance and microstructure of alloy 625 weld overlay on ASTM A516 grade 70

    Energy Technology Data Exchange (ETDEWEB)

    Moradi, Mohammad J. [Amirkabir Univ. of Technology, Tehran (Iran, Islamic Republic of). Petroleum Engineering Dept.; Ketabchi, Mostafa [Amirkabir Univ. of Technology, Tehran (Iran, Islamic Republic of). Mining and Metallurgical Engineering Dept.

    2016-02-01

    Nickel-based alloys are a crucial class of materials because of their excellent corrosion resistance. In the present study, single layer and two layers alloy 625 weld overlays were deposited by GTAW process on A516 grade 70 carbon steel. The dilution in terms of Fe, Ni, Mo and Nb content was calculated in 30 points of weld overlay. Microstructure observations showed that alloy 625 had austenitic structure with two types of Laves and NbC secondary phases. The uniform and pitting corrosion resistance of alloy 625 weld overlay as casted and as forged were evaluated in accordance with ASTM G48-2011 standard at different temperatures to determine the weight loss and critical pitting temperature. For achieving a better comparison, samples from alloy 625 as casted and as forged were tested under the same conditions. The results point out that single layer alloy 625 weld overlay is not suitable for chloride containing environments, two layers alloy 625 weld overlay and alloy 625 as casted have acceptable corrosion resistance and almost the same critical pitting temperature. Alloy 625 as forged has the best corrosion resistance and the highest critical pitting temperature among all test specimens. Also, the corrosion behavior was evaluated in accordance with ASTM G28 standard. The corrosion rate of single layer weld overlay was unacceptable. The average corrosion rate of two layers weld overlay and in casted condition were 35.82 and 33.01 mpy, respectively. [German] Nickellegierungen sind aufgrund ihres exzellenten Korrosionswiderstandes eine bedeutende Werkstoffklasse. In der diesem Beitrag zugrunde liegenden Studie wurden mittels WIG-Schweissens ein- und zweilagige Schweissplattierungen auf den Kohlenstoffstahl A516 (Grade 70) aufgebracht. Die Vermischung in Form des Fe-, Ni-, Mo- und Nb-Gehaltes wurde an 30 Punkten der Schweissplattierungen berechnet. Die mikrostrukturellen Untersuchungen ergaben, dass die Legierung 625 eine austenitische Struktur mit zwei Arten von

  18. Determination of CTOD C in Fibre Metal Laminates by ASTM and Schwalbe Methods

    Directory of Open Access Journals (Sweden)

    E.M. Castrodeza

    2002-06-01

    Full Text Available Fibre Metal Laminates (FMLs have arisen as a demand of the aeronautical industry to use thin sheets with high resistance to fatigue crack growth, high damage tolerance, corrosion resistance and high specific strength. Considering these requirements, FMLs are an advantageous choice when compared to metal alloys currently used. In order to employ FMLs in aircraft structures, designers must hold a deep knowledge of a wide set of their properties including fracture toughness. The aim of this work was to evaluate the available methodologies to measure fracture toughness at instability (CTOD C in unidirectional fibre metal laminates reinforced with aramid fibres (ARALL®. To achieve this, tests were performed to obtain traditional and Schwalbe CTODs by using experimental ASTM based techniques, especially adapted to these laminates. Results achieved point out that Schwalbe method is more appropriate and also that there are differences between both CTOD parameters.

  19. Comparisons of ASTM standards cited in the NRC standard review plan, NUREG-0800 and related documents

    International Nuclear Information System (INIS)

    Ankrum, A.R.; Bohlander, K.L.; Gilbert, E.R.; Pawlowski, R.A.; Spiesman, J.B.

    1995-10-01

    This report provides the results of comparisons of the cited and latest versions of ASTM standards cited in the NRC Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants (NUREG 0800) and related documents. The comparisons were performed by Battelle Pacific Northwest Laboratories in support of the NRC's Standard Review Plan Update and Development Program. Significant changes to the standards, from the cited version to the latest version, are described and discussed in a tabular format for each standard. Recommendations for updating each citation in the Standard Review Plan are presented. Technical considerations and suggested changes are included for related regulatory documents (i.e., Regulatory Guides and the Code of Federal Regulations) citing the standard. The results and recommendations presented in this document have not been subjected to NRC staff review

  20. Comparative study between EDXRF and ASTM E572 methods using two-way ANOVA

    Science.gov (United States)

    Krummenauer, A.; Veit, H. M.; Zoppas-Ferreira, J.

    2018-03-01

    Comparison with reference method is one of the necessary requirements for the validation of non-standard methods. This comparison was made using the experiment planning technique with two-way ANOVA. In ANOVA, the results obtained using the EDXRF method, to be validated, were compared with the results obtained using the ASTM E572-13 standard test method. Fisher's tests (F-test) were used to comparative study between of the elements: molybdenum, niobium, copper, nickel, manganese, chromium and vanadium. All F-tests of the elements indicate that the null hypothesis (Ho) has not been rejected. As a result, there is no significant difference between the methods compared. Therefore, according to this study, it is concluded that the EDXRF method was approved in this method comparison requirement.

  1. ASTM and VAMAS activities in titanium matrix composites test methods development

    Science.gov (United States)

    Johnson, W. S.; Harmon, D. M.; Bartolotta, P. A.; Russ, S. M.

    1994-01-01

    Titanium matrix composites (TMC's) are being considered for a number of aerospace applications ranging from high performance engine components to airframe structures in areas that require high stiffness to weight ratios at temperatures up to 400 C. TMC's exhibit unique mechanical behavior due to fiber-matrix interface failures, matrix cracks bridged by fibers, thermo-viscoplastic behavior of the matrix at elevated temperatures, and the development of significant thermal residual stresses in the composite due to fabrication. Standard testing methodology must be developed to reflect the uniqueness of this type of material systems. The purpose of this paper is to review the current activities in ASTM and Versailles Project on Advanced Materials and Standards (VAMAS) that are directed toward the development of standard test methodology for titanium matrix composites.

  2. Heat treatment evaluation of steel ASTM A-131 grade A by X-Ray diffraction

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira Junior, Francisco; Feio, Luciana Gaspar; Costa, Ednelson Silva; Rodrigues, Lino Alberto Soares; Braga, Eduardo Magalhaes, E-mail: juniorferrer93@gmail.com [Universidade Federal do Pará (UFPA), Belém, PA (Brazil)

    2016-07-01

    Full text: This study evaluates the residual stress of naval steel ASTM A-131 grade A before and after heat treatment. Residual stresses were determined by the technique of X-ray diffraction (XRD). Before heat treatment the residual stress measurements were made at 36 (thirty six) points distributed in a specimen with dimensions of 400 mm long, 200 mm wide and 95 mm thick, then the plate under analysis was brought to the oven for the implementation of heat treatment. To check the performance of the heat treatment, the plate was again subjected to XRD measurements of the same points previously measured in order to compare the residual stresses. As result, there was a reduction of residual stresses with the application of heat treatment. References: [1] COLPAERT, H. Metalografia dos Produtos Siderurgicos Comuns. 4 Edição. Editora Blucher. Saõ Paulo, SP, 2008. [2] HILL, R. Princípios de Metalurgia Física, 1992. (author)

  3. Designing cathodic protection systems for marine structures and vehicles. ASTM special technical publication 1370

    Energy Technology Data Exchange (ETDEWEB)

    Hack, H.P. [ed.

    1999-07-01

    Cathodic protection is an important method of protecting structures and ships from the corrosive effects of seawater. Poor designs can be far more costly to implement than optimal designs, Improper design can cause overprotection, with resulting paint blistering and accelerated corrosion of some alloys, underprotection, with resultant structure corrosion, or stray current corrosion of nearby structures. The first ASTM symposium specifically aimed at cathodic protection in seawater was intended to compile all the criteria and philosophy for designing both sacrificial and impressed current cathodic protection systems for structures and vehicles in seawater. The papers which are included in this STP are significant in that they summarize the major seawater cathodic protection system design philosophies. Papers have been processed separately for inclusion on the database.

  4. Phases Evolution of an ASTM 335 steel under continuous cooling P91

    International Nuclear Information System (INIS)

    Carrizo, D.A; Danon, C.A; Ramos, C.P

    2012-01-01

    This paper studies the influence of the cooling rate on phase transformations and the resulting microstructure in continuous cooling cycles for an ASTM A335 P91 steel, under fixed austenization conditions. The CCT (Continuous Cooling Transformation) diagram of this material is reported in the literature, so the main phase fields are known. The final structure of the samples depends on the austenitic grain size and the cooling rate. The studied samples were austenized at 1050 o C for 30 minutes and then cooled at different rates between 50 o C/h and 300 o C/h. The identification and characterization of the phases was carried out by using Scanning Electron Microscopy, X-ray Diffraction and Moessbauer Spectroscopy. From the results so obtained, additions to the CCT diagram of the material are proposed, providing new information to it

  5. Corrosion resistant properties and weldabilities of ASTM Grade 12 titanium alloy

    International Nuclear Information System (INIS)

    Tsumori, Yoshikatsu; Itoh, Hideo

    1988-01-01

    Plates, sheets, bars, wires and thinner seam-welded tubings were manufactured from large-scaled ingot of ASTM Grade 12 alloy (Ti-0.8Ni-0.3Mo). The processability of G-12 alloy has proved almost similar to that of conventional commercially pure titanium grades. It has been clarified that the G-12 alloy showed several advantageous features: Chlorides-Crevice corrosion resistance of the alloy was almost equals to G-7 and Pd0/TiO 2 coated titanium, and the maximum allowable stress was able to be designed higher than that of commercially pure titanium. This alloy has been in applications also offers where such environments as seawater, brines and moist chlorine, various oil refinery and chemical industries, and others. (author)

  6. Effects of heat treatment to the sound velocity and microstructural changes of ASTM A516 steels

    International Nuclear Information System (INIS)

    Norasiah Abdul Kasim; Azali Muhammad; Amry Amin Abas; Zaiton Selamat

    2010-01-01

    Full-text: The used of ultrasonic testing as a thickness measurement for structural components (pipeline and pressure vessel) is among the popular inspection tool widely use in the industrial power plant such as at petrochemical and nuclear power plant. Currently, there are cases where the thickness grows and the result will affect the reliability of the test. There are many factors that can affect the reliability of measurement. One of it is the material under test itself. In the Malaysian Nuclear Agency, initial efforts are underway to study the understanding on the effects of heat treatment to the sound velocity and microstructure changes of ASTM A516 steel. Few samples of thin square shaped prepared were heat treated under the following conditions: austenitization at 9800 degree Celsius - 2 hours, quenching; tempering at various temperature 4000, 5000, 6000 and 7000 degree Celsius. The results show that the microstructure changes and samples exhibit different sound velocity at different heat treatment. (author)

  7. Microstructure evolution of ASTM 335 P91 steel, subjected to continuous cooling

    International Nuclear Information System (INIS)

    Carrizo, D.A; Danon, C.A; Ramos, C.P

    2012-01-01

    This paper studies the influence of the cooling rate on an isothermal phase transformations in ASTM A335 P91 steel, by the analysis of the resulting microstructure after several continuous cooling cycles under fixed austenization conditions. The CCT (Continuous Cooling Transformation) diagram of this material has already been reported in the literature, so the main phase fields are known, and they depend on the austenitic grain size and the cooling rate. Five samples were tested in a dilatometer, they were austenized and then cooled at different rates between 50 o C/h and 300 o C/h. The identification and characterization of the resulting phases was carried out by using Scanning Electron Microscopy, X-ray Diffraction and Mossbauer Spectroscopy. The obtained results allowed to add information about the presence of retained austenite and (Fe,Cr) 3 C - type carbides to the CCT diagram of the material (author)

  8. Determination of ASTM 1016 structural welded joints fracture toughness through J integral

    International Nuclear Information System (INIS)

    Martins, Geraldo de Paula; Villela, Jefferson Jose; Terra, Jose Lucio; Rabello, Emerson Giovani; Martins, Geraldo Antonio Scoralick; Carneiro, Jose Rubens Goncalves

    2009-01-01

    Fracture toughness is an important parameter for studies of materials behavior in nuclear and conventional industry. Crack propagation resistance is, in general, evaluate using one of the fracture mechanics parameters K IC , for the case of the materials that exhibits a linear elastic behavior, the CTOD (crack tip opening displacement) and J IC , the critical value of J Integral, for the case of materials with elastic-plastic behavior. On this work the fracture mechanics parameters of the ASTM 1016 structural steel welded joints were obtained, using the J Integral. Charpy V tests at several temperatures were also obtained, with the purpose to obtain the curves of ductile-brittle of the regions of the welded joints: Base Metal, (MB), and Melted Zone (MZ). The joints were welded by Gas Metal Arc Welding (GMAW) with V bevel for evaluation the MZ toughness properties. The tests were accomplished at temperatures varying from -100 deg C to 100 deg C using the technical of compliance variation for J IC determination, the critical value that defines the initial stable crack growth, that applies to brittle and ductile materials. The J Integral alternative specimens has square cross section 10mmX10mm, according ASTM E 1820, with notch localized respectively at the BM and MZ. After the tests, the specimens fractured were analyzed in a scanning microscopic electronic (SME) for verification of the fracture surface. The fractography of the specimens at elevated temperatures presented dimples at the region of stable crack growth, characteristic of ductile fracture. The results of J Integral and Charpy V presented a good correlation between these two parameters. From these correlations it can be concluded that in some applications, the use Charpy V energy to infer fracture toughness can be substitute the Integral J tests. (author)

  9. Construction of the Orsay ACO storage ring, 1: progress report. 2: detecting systems; La construction de l'anneau de stockage ACO d'Orsay, 1: etat des travaux. 2: systemes de detection

    Energy Technology Data Exchange (ETDEWEB)

    Blanc-Lapierre, A; Arzelier, G; Beck, R A; Belbeoch, R; Boutouyrie, B; Bruck, H; Burnod, L; Gendreau, G; Gratreau, P; Haissinski, J; Jolivot, R; Laborde, J; Le Duff, J; Leleux, G; Marin, P C; Milman, B; Sommer, E; Zyngier, H [Laboratoire de l' Accelerateur Lineaire, 91 - Orsay (France); [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires; Augustin, J E; Rumpf, F; Silva, E

    1966-07-01

    1. - A brief progress report is given, with mention of the difficulties solved since the 1963 Dubna Conference and the extra facilities which will be available on the ring (beam observation and measurements); 2. - Typical large solid angle detecting systems and equipment for accurate monitoring under construction at Orsay are also presented. Emphasis is put on some peculiar features at ACO as a tool for physics: long experimental straight section and short length of the bunches. (authors) [French] 1. - Un bref rapport est presente sur l'etat d'avancement du projet ACO en precisant les difficultes resolues depuis la Conference de Dubna en 1963, et les moyens nouveaux mis en place sur l'anneau pour les observations et mesures sur les faisceaux; 2. - Des systemes de detection a grand angle solide et de monitorage precis, en construction a Orsay, sont egalement presentes. On insiste sur quelques traits particuliers d'ACO en tant qu'outil de travail de physique: section droite experimentale longue et paquets courts. (auteurs)

  10. Taponamiento cardíaco secundario a carcinoma papilar esclerosante difuso de tiroides

    Directory of Open Access Journals (Sweden)

    Verónica Riva

    2011-12-01

    Full Text Available El carcinoma papilar, variante esclerosante difusa, corresponde al 2% de todos los carcinomas papilares de la tiroides. Se caracteriza por comprometer de manera difusa y bilateral a la glándula tiroides. Clínicamente se manifiesta con metástasis ganglionares y pulmonares, afectando predominantemente a mujeres jóvenes. Se describe un caso de taponamiento cardíaco como presentación inicial de un carcinoma papilar de tiroides variante esclerosante difusa. Una mujer de 32 años concurrió al servicio de emergencias médicas refiriendo epigastralgia y tos seca. Durante el examen físico se constató hipotensión arterial, taquicardia y ruidos cardíacos disminuidos. Se realizó un ecocardiograma, observándose derrame pericárdico. Por medio de una pericardiocentesis se obtuvo líquido pericárdico, cuyo análisis mostró células neoplásicas. Durante la evolución la paciente presentó recurrencia del derrame pericárdico por lo que se realizó una ventana pleuropericárdica, detectándose durante la cirugía una lesión nodular subpleural, la cual fue biopsiada e informada posteriormente como una metástasis de carcinoma papilar vinculable a origen tiroideo. Se realizó una tiroidectomía total con linfadenectomía cervical bilateral. El diagnóstico final fue carcinoma papilar, variante esclerosante difusa. Esta variante infiltra el tejido conectivo de los espacios interfoliculares, simulando una tiroiditis y se caracteriza por una permeación vascular temprana. En oposición a la variante clásica, la esclerosante difusa presenta mayor agresividad y mayor tasa de recurrencia. El carcinoma papilar de tiroides debe tenerse presente como diagnóstico diferencial en nuestro medio, en todas aquellas lesiones neoplásicas papilares metastásicas, más aún si se trata de mujeres jóvenes.

  11. Implementation of a Pilot ACO Payment Model and the Use of Discretionary and Non-Discretionary Cardiovascular Care

    Science.gov (United States)

    Colla, Carrie. H.; Goodney, Philip P.; Lewis, Valerie A.; Nallamothu, Brahmajee K.; Gottlieb, Daniel J.; Meara, Ellen R.

    2014-01-01

    Background Accountable care organizations (ACOs) seek to reduce growth in healthcare spending while ensuring high-quality care. We hypothesized that ACO implementation would selectively limit utilization of discretionary cardiovascular care (defined as care occurring in the absence of indications such as myocardial infarction or stroke), while maintaining high-quality care such as non-discretionary cardiovascular imaging and procedures. Methods and Results The intervention group was composed of fee-for-service Medicare patients (n=819,779) from 10 groups participating in a Medicare pilot ACO, the Physician Group Practice Demonstration (PGPD). Matched controls were patients (n=934,621) from non-participating groups in the same regions. We compared utilization of cardiovascular care before (2002-2004) and after (2005-2009) PGPD implementation, studying both discretionary and non-discretionary carotid and coronary imaging and procedures. Our main outcome measure was the difference in the proportion of patients treated with imaging and procedures, among patients of PGPD practices compared to patients in control practices, before and after PGPD implementation (difference-in-difference). For discretionary imaging, the difference-in-difference between PGPD practices and controls was not statistically significant for discretionary carotid imaging (0.17%; 95% CI -0.51% to 0.85%, p=0.595) or discretionary coronary imaging (-0.19%; 95% CI -0.73% to 0.35%, p=0.468). Similarly, the difference-in-difference was also minimal for discretionary carotid revascularization (0.003%; 95% CI -0.008% to 0.002%, p=0.705) and coronary revascularization (-0.02%, 95% CI -0.11% to 0.07%, p=0.06). The difference-in-difference associated with PGPD implementation was also essentially zero for non-discretionary cardiovascular imaging or procedures. Conclusions Implementation of a pilot ACO did not limit the utilization of discretionary or non-discretionary cardiovascular care in ten large health

  12. Silencing of ACO decreases reproduction and energy metabolism in triazophos-treated female brown plant hoppers, Nilaparvata lugens Stål (Hemiptera: Delphacidae).

    Science.gov (United States)

    Liu, Zong-Yu; Jiang, Yi-Ping; Li, Lei; You, Lin-Lin; Wu, You; Xu, Bin; Ge, Lin-Quan; Wu, Jin-Cai

    2016-03-01

    The brown plant hopper (BPH), Nilaparvata lugens Stål (Hemiptera: Delphacidae), is a major pest affecting rice in Asia, and outbreaks of this pest are closely linked to pesticide-induced stimulation of reproduction. Therefore, the BPH is a classic example of a resurgent pest. However, the effects of different genes on the regulation of pesticide-induced reproductive stimulation in the BPH are unclear. In this study, the regulatory effects of acyl-coenzyme A oxidase (ACO) on the reproduction and biochemistry of the BPH were investigated with gene silencing. The number of eggs laid per female by triazophos (TZP)+dsACO BPH females was significantly lower than those of TZP-treated (without ACO silencing) or TZP+GFP females (negative control), with the number of eggs decreasing by 30.8% (from 529.5 to 366.3) and 32.0% (from 540.5 to 366.3), respectively. The preoviposition period, oviposition period, and longevity of the TZP-treated females were also influenced by dsACO treatment. Additionally, the amounts of crude fat, protein, and some fatty acids (oleic acid, palmitic acid, linoleic acid, stearic acid, and myristoleic acid) in TZP+dsACO females were significantly lower than in TZP-treated females. Thus, ACO is one of the key genes regulating the TZP-induced stimulation of reproduction in BPH females. Copyright © 2015 Elsevier Inc. All rights reserved.

  13. Effects of the normalizing time and temperature on the impact properties of ASTM A-516 grade 70 steel

    International Nuclear Information System (INIS)

    Carneiro, T.; Cescon, T.

    1982-01-01

    The influence of normalizing time and temperature, as well as the plate thickness, on the impact properties of ASTM A-516 grade 70 steel, is studied. Results show that different normalizing conditions may lead to equivalent microstructure with different impact properties. Normalizing conditions that cause low cooling rate in the critical zone exhibit banded microstructure with inferior impact properties. (Author) [pt

  14. Standard test method for compressive strength of grouts for preplaced-aggregate concrete in the laboratory. ASTM standard

    International Nuclear Information System (INIS)

    1998-10-01

    DoD adopted. This test method is under the jurisdiction of ASTM Committee C-9 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.41 on Concrete for Radiation Shielding. Current edition approved Feb. 10, 1986 and published October 1998. Originally published as C 942-81. Last previous edition was C 942-86(1991)

  15. Standard test method for static leaching of monolithic waste forms for disposal of radioactive waste. ASTM standard

    International Nuclear Information System (INIS)

    1998-10-01

    This test method is under the jurisdiction of ASTM Committee C-26 on Nuclear Fuel Cycles and is the direct responsibility of Subcommittee C26.07 on Waste Materials. The current edition was approved July 10, 1998, and published in October 1998. It was originally published as C 1220-92. The last previous edition was C 1220-92

  16. Vacuum decay container/closure integrity testing technology. Part 1. ASTM F2338-09 precision and bias studies.

    Science.gov (United States)

    Wolf, Heinz; Stauffer, Tony; Chen, Shu-Chen Y; Lee, Yoojin; Forster, Ronald; Ludzinski, Miron; Kamat, Madhav; Godorov, Phillip; Guazzo, Dana Morton

    2009-01-01

    ASTM F2338-09 Standard Test Method for Nondestructive Detection of Leaks in Packages by Vacuum Decay Method is applicable for leak-testing rigid and semi-rigid non-lidded trays; trays or cups sealed with porous barrier lidding materials; rigid, nonporous packages; and flexible, nonporous packages. Part 1 of this series describes the precision and bias studies performed in 2008 to expand this method's scope to include rigid, nonporous packages completely or partially filled with liquid. Round robin tests using three VeriPac 325/LV vacuum decay leak testers (Packaging Technologies & Inspection, LLC, Tuckahoe, NY) were performed at three test sites. Test packages were 1-mL glass syringes. Positive controls had laser-drilled holes in the barrel ranging from about 5 to 15 microm in nominal diameter. Two different leak tests methods were performed at each site: a "gas leak test" performed at 250 mbar (absolute) and a "liquid leak test" performed at about 1 mbar (absolute). The gas leak test was used to test empty, air-filled syringes. All defects with holes > or = 5.0 microm and all no-defect controls were correctly identified. The only false negative result was attributed to a single syringe with a ASTM F2338-09 test method and the precision and bias study report are available by contacting ASTM International in West Conshohocken, PA, USA (www.astm.org).

  17. Eight reasons payer interoperability and data sharing are essential in ACOs. Interoperability standards could be a prerequisite to measuring care.

    Science.gov (United States)

    Mookencherry, Shefali

    2012-01-01

    It makes strategic and business sense for payers and providers to collaborate on how to take substantial cost out of the healthcare delivery system. Acting independently, neither medical groups, hospitals nor health plans have the optimal mix of resources and incentives to significantly reduce costs. Payers have core assets such as marketing, claims data, claims processing, reimbursement systems and capital. It would be cost prohibitive for all but the largest providers to develop these capabilities in order to compete directly with insurers. Likewise, medical groups and hospitals are positioned to foster financial interdependence among providers and coordinate the continuum of patient illnesses and care settings. Payers and providers should commit to reasonable clinical and cost goals, and share resources to minimize expenses and financial risks. It is in the interest of payers to work closely with providers on risk-management strategies because insurers need synergy with ACOs to remain cost competitive. It is in the interest of ACOs to work collaboratively with payers early on to develop reasonable and effective performance benchmarks. Hence, it is essential to have payer interoperability and data sharing integrated in an ACO model.

  18. Ant Colony Optimization ACO For The Traveling Salesman Problem TSP Using Partitioning

    Directory of Open Access Journals (Sweden)

    Alok Bajpai

    2015-08-01

    Full Text Available Abstract An ant colony optimization is a technique which was introduced in 1990s and which can be applied to a variety of discrete combinatorial optimization problem and to continuous optimization. The ACO algorithm is simulated with the foraging behavior of the real ants to find the incremental solution constructions and to realize a pheromone laying-and-following mechanism. This pheromone is the indirect communication among the ants. In this paper we introduces the partitioning technique based on the divide and conquer strategy for the traveling salesman problem which is one of the most important combinatorial problem in which the original problem is partitioned into the group of sub problems. And then we apply the ant colony algorithm using candidate list strategy for each smaller sub problems. After that by applying the local optimization and combining the sub problems to find the good solution for the original problem by improving the exploration efficiency of the ants. At the end of this paper we have also be presented the comparison of result with the normal ant colony system for finding the optimal solution to the traveling salesman problem.

  19. European experiences of the proposed ASTM test method for crack arrest toughness of ferritic materials

    International Nuclear Information System (INIS)

    Jutla, T.; Lidbury, D.P.G.; Ziebs, J.; Zimmermann, C.

    1986-01-01

    The proposed ASTM test method for measuring the crack arrest toughness of ferritic materials using wedge-loaded, side-grooved, compact specimens was applied to three steels: A514 bridge steel, A588 bridge steel, and A533B pressure vessel steel. Five sets of results from different laboratories are discussed here. Notches were prepared by spark erosion, although root radii varied from ∝0.1-1.5 mm. Although fast fractures were successfully initiated, arrest did not occur in a significant number of cases. The results showed no obvious dependence of crack arrest toughness, K a , (determined by a static analysis) on crack initiation toughness, K 0 . It was found that K a decreases markedly with increasing crack jump distance. A limited amount of further work on smaller specimens of the A533B steel showed that lower K a values tended to be recorded. It is concluded that a number of points relating to the proposed test method and notch preparation are worthy of further consideration. It is pointed out that the proposed validity criteria may screen out lower bound data. Nevertheless, for present practical purposes, K a values may be regarded as useful in providing an estimate of arrest toughness - although not necessarily a conservative estimate. (orig./HP)

  20. Silicon Damage Response Function Derivation and Verification: Assessment of Impact on ASTM Standard E722

    Energy Technology Data Exchange (ETDEWEB)

    Depriest, Kendall [Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

    2016-06-01

    Unsuccessful attempts by members of the radiation effects community to independently derive the Norgett-Robinson-Torrens (NRT) damage energy factors for silicon in ASTM standard E722-14 led to an investigation of the software coding and data that produced those damage energy factors. The ad hoc collaboration to discover the reason for lack of agreement revealed a coding error and resulted in a report documenting the methodology to produce the response function for the standard. The recommended changes in the NRT damage energy factors for silicon are shown to have significant impact for a narrow energy region of the 1-MeV(Si) equivalent fluence response function. However, when evaluating integral metrics over all neutrons energies in various spectra important to the SNL electronics testing community, the change in the response results in a small decrease in the total 1- MeV(Si) equivalent fluence of ~0.6% compared to the E722-14 response. Response functions based on the newly recommended NRT damage energy factors have been produced and are available for users of both the NuGET and MCNP codes.

  1. Simplification and transformation of ASTM F1292 measurement procedure for fall accident injury criteria.

    Science.gov (United States)

    Kato, Maki; Shimodaira, Yoshie; Sato, Takeshi; Iida, Hiromi

    2014-01-01

    Protecting children from injuries caused by fall accidents from playground equipment is important. Therefore, measures toward minimizing the risk of fall accident injuries are required. The risk of injury can be evaluated using ASTM F1292. In this test, G-max and the HIC are used to estimate the risk of injury. However, the measurement procedure is too complicated for application to a large number of installed equipment. F1292 requires simplified by reducing the number of phases, even with a small risk of loss in accuracy. With this in mind, this study proposes a shortened measurement procedure and a transformation equation to estimate the risk as same as F1292. As the result of experiments, it was revealed that G-max and the HIC values for both procedures linearly increase with drop height. The differences in outcomes between the regression equations of the standardized procedure and those of the shortened procedure can be used as a correction value. They can be added to the value measured by the shortened procedure. This suggests that the combination of the shortened procedure and transformation equation would be equivalent to F1292, with the advantage of being more easily and efficiently applied to the evaluation of installed playground equipment.

  2. Repeatability and Reproducibility of Compression Strength Measurements Conducted According to ASTM E9

    Science.gov (United States)

    Luecke, William E.; Ma, Li; Graham, Stephen M.; Adler, Matthew A.

    2010-01-01

    Ten commercial laboratories participated in an interlaboratory study to establish the repeatability and reproducibility of compression strength tests conducted according to ASTM International Standard Test Method E9. The test employed a cylindrical aluminum AA2024-T351 test specimen. Participants measured elastic modulus and 0.2 % offset yield strength, YS(0.2 % offset), using an extensometer attached to the specimen. The repeatability and reproducibility of the yield strength measurement, expressed as coefficient of variations were cv(sub r)= 0.011 and cv(sub R)= 0.020 The reproducibility of the test across the laboratories was among the best that has been reported for uniaxial tests. The reported data indicated that using diametrically opposed extensometers, instead of a single extensometer doubled the precision of the test method. Laboratories that did not lubricate the ends of the specimen measured yield stresses and elastic moduli that were smaller than those measured in laboratories that lubricated the specimen ends. A finite element analysis of the test specimen deformation for frictionless and perfect friction could not explain the discrepancy, however. The modulus measured from stress-strain data were reanalyzed using a technique that finds the optimal fit range, and applies several quality checks to the data. The error in modulus measurements from stress-strain curves generally increased as the fit range decreased to less than 40 % of the stress range.

  3. OPTIMIZACION DE LAS PROPIEDADES DE TRANSPORTE IONICO DEL CONCRETO Y SIMULACION DEL ENSAYO ASTM C1202

    Directory of Open Access Journals (Sweden)

    JUAN LIZARAZO MARRIAGA

    2009-01-01

    Full Text Available En este artículo se presentan los resultados de la simulación computacional del flujo de los principales iones presentes (Cl-, OH-, Na+, y K+ en un ensayo ASTM C1202: "Indicación eléctrica de la resistencia del concreto a la penetración de Iones cloruro". Para la modelación se utilizó un esquema de diferencias finitas definido mediante la ecuación de Nernst - Plank con un campo eléctrico variable, la cual describe los movimientos iónicos en un material poroso saturado. Para lograr esto, los resultados de un nuevo ensayo electroquímico diseñado para medir el potencial de membrana, en compañía de la corriente eléctrica, fueron optimizados para obtener los coeficientes intrínsicos de difusión, la composición inicial de la solución de poros, la capacidad de fijación de cloruros y la porosidad de la mezcla de concreto.

  4. The new ASTM Manual for scrubber linings the evolution of a consensus guide

    International Nuclear Information System (INIS)

    Spires, G.V.; Cavallo, J.R.

    1984-01-01

    Faced with spiraling fuel oil costs, power utilities turned to abundant and inexpensive domestic coal and lignite. Conversions and new units designed to burn solid fossil fuels were pursued at a near crisis pace to get out from under the economic penalties associated with the continued use of oil. Coal contains much more sulfur than oil; EPA limitations on SO 2 necessitated costly flue gas desulfurization (FGD) systems when burning coal. Scrubbed gas presented a particularly corrosive environment in and downstream from the FGD system. Problems which often accompany a new technology were soon evident. Materials and linings initially selected were often seen to be inadequate. Severe and rapid degradation was commonplace. This paper traces the development of the recently published ASTM Manual of Protective Linings From Flue Gas Desulfurization System. The scope of the Manual is outlined and some of the more commonly used FGD lining systems are reviewed. Finally some views on the impact of foreseeable changes in regulations and FGD technology on the use and maintenance of FGD system linings are discussed

  5. Characterization of ASTM A335 P92 steel in continuous cooling cycles

    International Nuclear Information System (INIS)

    Xaubet, M. N.; Danón, C. A.; Ramos, C. P.

    2013-01-01

    The operating conditions demanded by Generation IV reactors include high temperatures, higher radiation doses and highly corrosive environments. Among the structural materials proposed both for in-core and out-of-core applications, elevated-temperature P91/P92 ferritic/martensitic steels have been considered. This work studies the transformation behavior and microstructural evolution of ASTM A335 P92 steel in continuous cooling cycles (CCT). The material was austenized at 1050 ºC and afterwards cooled down at controlled rates (300, 50 and 15 ºC/h). The determination and characterization of the phases present in the samples was performed by optical microscopy, field emission scanning electron microscopy, Mössbauer spectroscopy and X-ray diffraction. Samples whose cooling rates were on the limits of the studied range (300 and 15 ºC/h) presented completely martensitic and completely ferritic structures, respectively. The sample cooled down at intermediate rate exhibited, though, a mixed structure of martensite and ferrite. Second-phase precipitation has also been observed in all the samples. (author)

  6. Tekken tests in a steel 'ASTM A 514 GR B' to determine the preheating temperature

    International Nuclear Information System (INIS)

    Quesada, Hector Juan; Zalazar, Monica; Asta, Eduardo Pablo

    2004-01-01

    Cold fissure tests are used to determine the proper preheating temperature in order to prevent fissures during the steel welding process. Tekken tests were carried out on a quenched and tempered high resistance 25.4 mm thick steel (ASTM A514 Gr.B) used in structural applications. The welding was carried out using a FCAW semiautomatic process with gas protection and low hydrogen tubular electrode E110T5-K4. Similar parameters and splicing design were later applied in production. The microstructures of the base material and the welding were determined by optic and electron microscopy. The thermal cycles of the welding were recorded in order to relate the preheating temperature with the cooling time from 800 o C - 500 o C (t 8/5 ) and from 800 o C - 100 o C (tg/1) and the presence or not of fissures. Preheating at 150 o C and t 8/5 greater than 17 s was found to guarantee fissure free welding (CW)

  7. Tekken testing to determine the preheating temperature on ASTM A514 GR B steel

    International Nuclear Information System (INIS)

    Asta, Eduardo; Zalazar, Monica; Quesada, Hector

    2003-01-01

    The cold cracking test methods are used to determine the preheating temperature in order to avoid cracking in steel welding.In this work Tekken tests on high strength quenching and tempering (ASTM A514 GrB) structural steel with a thickness of 25 mm have been made.The welds were done using a FCAW process with gas shielding and basic low hydrogen cored wire E 110T5-K4.The welding parameters and joint design applied in this work are similar to the ones used on site production.The base metal, HAZ and weld metal microstructure have been evaluated by optical and SEM microscopy.Thermal cycles records of each welding have been made to relate preheat temperature with the cooling time on the range of 800-500 degC (t8/5) or 800-100degC (t8/1) and the evidence of crack or no crack condition.Finally, a preheat temperature of 150degC and the cooling time larger than 17 s improve a welding integrity without cracks

  8. Heat treatment temperature influence on ASTM A890 GR 6A super duplex stainless steel microstructure

    International Nuclear Information System (INIS)

    Martins, Marcelo; Casteletti, Luiz Carlos

    2005-01-01

    Duplex and super duplex stainless steels are ferrous alloys with up to 26% chromium, 8% nickel, 5% molybdenum and 0.3% nitrogen, which are largely used in applications in media containing ions from the halogen family, mainly the chloride ion (Cl - ). The emergence of this material aimed at substituting Copper-Nickel alloys (Cupro-Nickel) that despite presenting good corrosion resistance, has mechanical properties quite inferior to steel properties. The metallurgy of duplex and super duplex stainless steel is complex due to high sensitiveness to sigma phase precipitation that becomes apparent, due to the temperatures they are exposed on cooling from solidification as well as from heat treatment processes. The objective of this study was to verify the influence of heat treating temperatures on the microstructure and hardness of ASTM A890/A890M Gr 6A super duplex stainless steel type. Microstructure control is of extreme importance for castings, as the chemical composition and cooling during solidification inevitably provide conditions for precipitation of sigma phase. Higher hardness in these materials is directly associated to high sigma phase concentration in the microstructure, precipitated in the ferrite/austenite interface. While heat treatment temperature during solution treatment increases, the sigma phase content in the microstructure decreases and consequently, the material hardness diminishes. When the sigma phase was completely dissolved by the heat treatment, the material hardness was influenced only due to ferrite and austenite contents in the microstructure

  9. Tumores cardíacos: 10 anos de experiência

    Directory of Open Access Journals (Sweden)

    Antônio Augusto MIANA

    1997-01-01

    Full Text Available Objetivo: Avaliar a experiência cirúrgica do grupo no tratamento dos tumores cardíacos durante o período de janeiro de 1985 a dezembro de 1994. Casuística e Métodos: De um total de 2268 cirurgias cardíacas com circulação extracorpórea realizadas neste período de 10 anos, 6 foram para extirpação de tumores intracavitários, perfazendo 0,26% dos casos. Destes, 3 eram mixomas de átrio esquerdo, 1 fibroelastoma papilar de valva mitral, 1 rabdomioma de ventrículo esquerdo e 1 fibroma de ventrículo esquerdo. A forma clínica de apresentação foi embolia sistêmica (3 casos ou insuficiência cardíaca (3 casos. O diagnóstico foi ecocardiográfico (5 casos e angiográfico (6 casos. Resultados: Todos os pacientes tiveram evolução imediata favorável, exceto 1 deles, com mixoma de átrio equerdo, que evoluiu com mediastinite e septicemia, vindo a falecer e constituindo o único óbito hospitalar. O seguimento pós-operatório tardio, obtido em 4 pacientes (15 a 111 meses - média 49 ± 36,8 meses, não detectou qualquer recidiva, encontrando-se todos em classe funcional I (NYHA. Conclusões: Os autores concluem que os tumores cardíacos são bastante raros, de fácil diagnóstico desde que considerados, na grande maioria benignos e que cursam favoravelmente com a extirpação cirúrgica.Purpose: To review the surgical experience of our group in the treatment of primary cardiac tumors, during a 10 year period beginning January 1985 till December 1994. Material and Methods: From a total of 2268 cardiac surgeries with the aid of extracorporeal circulation performed during this 10 year period, there were 6 cases of intracavitary tumor resection, an incidence of 0.26%. Three were myxomas of the left atrium, 1 papillary fibroelastoma of the mitral valve, 1 rhabdomyoma of the left ventricule and 1 fibroma of the left ventricle. Three patients presented systemic embolism and the other three congestive heart failure. The diagnosis was confirmed

  10. Transplante cardíaco humano: experiência inicial Human cardiac transplant: initial experience

    Directory of Open Access Journals (Sweden)

    Noedir A. G Stolf

    1986-12-01

    Full Text Available No Instituto do Coração, de março de 1985 a fevereiro de 1986,11 pacientes foram submetidos a transplante cardíaco ortotópico. Eram todos do sexo masculino, com idade variando de 39 a 54 anos; 6 com cardiopatia isquémica, 4 com cardiomiopatia dilatada e um com cardiomiopatia chagásica. Foi realizado estudo hemodinâmico através de catéter de Swan-Ganz, no pré-operatório, no pós-operatório, após estabilização na unidade de recuperação, e trinta ou mais dias após o transplante. Os dados mostram melhora progressiva em relação ao índice cardíaco, pressão em artéria pulmonar, pressão de capilar pulmonar, resistência vascular pulmonar e resistência vascular sistêmica. Três dos 11 pacientes apresentaram disfunção renal transitória no pós-operatório imediato e que regrediram até o 15º dia, enquanto que 2 pacientes apresentaram aumento moderado da creatinina plasmática. Apenas 3 pacientes não apresentaram qualquer episódio de rejeição; nos demais, esses episódios foram um diagnóstico histológico sem repercussões clínicas. Complicações infecciosas ocorreram em 9 pacientes e foram de fácil controle clínico. No pós-operatório tardio, a hipertensão esteve presente em 8 pacientes, sendo mais acentuada em 2 deles. Não houve óbitos, nesta série de pacientes; todos estão assintomáticos e os 6 primeiros estão trabalhando.At the Instituto do Cora��ão, University of São Paulo Medical School, 11 patients were submitted to heart transplantation from march 1985 up to february 1986. All were male, with ages of 39-59 years, 6 with coronary heart disease, 4 with dilated cardiomyopathy and 1 with Chagas cardiomyopathy. The patients were studied hemodynamically with a Swan-Ganz catheter pre-operatively, at the arrival in the intensive care unit, in the first postoperative day and 30 or more days after the transplant. The data showed that there was a progressive increase of cardiac index and decreases of

  11. Changes in oxidative stress in transgenic RNAi ACO1 tomato fruit during ripening

    Science.gov (United States)

    Eglous, Najat Mohamed; Ali, Zainon Mohd; Hassan, Maizom; Zainal, Zamri

    2013-11-01

    Tomato (Solanum Lycopersicum L.) is the second most cultivated vegetable in the world and widely used as a system for studying the role of ethylene during fruit ripening. Our objective was to study the oxidative stress and antioxidative metabolism during ripening of non transgenic tomato and transgenic line-21 tomato which reduced ethylene. The line-21 of transgenic tomato plants (RNAi ACO1) had lower ethylene production and longer shelf-life more than 32 days as compared to the wild-type fruits which have very short shelf-life. In this study, tomato fruit were divided into five different stages (MG: mature green 5%, B: breaker 25%, T: turning 50%, O: orange75%, RR: red ripe100%). The activity of lipoxygenase (LOX) and lipid peroxidation (MDA) were measured to assess changes in oxidative stress. The LOX activity and MDA content decreased significantly obtaining 2.6-fold and 1.2-fold, respectively, as compared to the wild type fruit. However, superoxide dismutase (SOD) and catalase (CAT) activities were increased to 1.9 and 1.2 folds from the mature green to the fully ripe stage in transgenic tomatoes. Furthermore, the wild type tomato increases 1.3 in SOD and 1.6 in CAT activities. The overall results indicate that the wild type tomato fruit showed a faster rate of ripening, parallel to decline in the rate of enzymatic antioxidative systems as compared to the transgenic line-21 tomato fruit. In addition, the results show that the antioxidant capacity is improved during the ripening process and is accompanied by an increase in the oxidative stress.

  12. Status on the selection and development of an embrittlement trend curve to use in ASTM standard guide E900

    International Nuclear Information System (INIS)

    Kirk, M.; Brian Hall, J.; Server, W.; Lucon, E.; Erickson, M.; Stoller, R.

    2015-01-01

    ASTM E900-07, Standard Guide for Predicting Radiation-Induced Transition Temperature Shift in Reactor Vessel Materials, includes an embrittlement trend curve. The trend curve can be used to predict the effect of neutron irradiation on the embrittlement of ferritic pressure vessel steels, as quantified by the shift in the Charpy V-Notch transition curve at 41 Joules of absorbed energy (ΔT 41J ). The current E900 trend curve was first adopted in the 2002 revision. In 2011 ASTM Subcommittee E10.02 undertook an extensive effort to evaluate the adequacy of the E900 trend curve for continued use. This paper summarizes the current status of this effort, which has produced a trend curve calibrated using a database of over 1800 ΔT 41J values from the light water reactor surveillance programs in thirteen countries. (authors)

  13. Estimation of improved productivity based on materials substitution in high temperature applications. Use of alloy ASTM A-335 P91

    International Nuclear Information System (INIS)

    Serna, J A; Afanador, W

    2001-01-01

    In ECOPETROL-ICP was carried out an evaluation of the mechanical and micro structural properties of modified 9 Cr-1 Mo alloy, ASTM A-335 Gr. P91, finding higher strength mechanical properties, allowable stresses and creep rupture strength, than the conventional 9 Cr-1 Mo alloy, ASTM A-335 Gr. P9, recommending the alloy P91 as substitute tube material in the radiation zone of the Visbreaking heater of Cartagena's refinery (furnace in revamping process). The results obtained permit a thickness reduction of radiation tubes of material P91 close to 25% and increase the internal volume tube over up 8%, which is a parameter to consider in improving productivity and efficiency process. Also would be obtained a significant savings cost in the material among 5 and 10%. Additionally, expectations of both design and remaining useful life would be seen extensively favored with this change of alloy

  14. Standard specification for cobalt-chromium-nickel-molybdenum-tungsten alloy (UNS R31233) plate, sheet and strip. ASTM standard

    International Nuclear Information System (INIS)

    1998-09-01

    This specification is under the jurisdiction of ASTM Committee B-2 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.07 on Refined Nickel and Cobalt, and Alloys Containing Nickel or Cobalt or Both as Principal Constituents. Current edition approved Apr. 10, 1998 and published September 1998. Originally published as B 818-91. Last previous edition was B 818-93

  15. Comparative Study of API 5L X60 and ASTM 572 Gr50 Steel Exposed to Crude Oil and Seawater

    Directory of Open Access Journals (Sweden)

    Marcy Viviana Chiquillo Márquez

    2018-04-01

    Full Text Available In the petroleum industry, the biphasic conditions in storage and separation tanks allow that the material to remain exposed to two different environments, causing its deterioration. In this article, an evaluation is made of the corrosive behavior and Vickers microhardness (HV of two high strength low alloy (HSLA steels and how their surfaces are characterized. The ASTM 572 Gr50 steel showed a lower corrosion rate in all systems after being immersed for 720 and 1440 hours. Characterizing the surface by means of Scanning Electron Microscopy (SEM showed uniform and localized corrosion for the both steels, and revealed that the ASTM 572 Gr50 steel shows pitting corrosion in crude oil systems. The electrochemical results revealed that the corrosion potential of API X60 steel was more negative; however the ASTM 572 Gr50 steel had a higher current density and a lower polarization resistance when immersed in an oil/seawater mixture. It also observed that, after being immersed in the corrosive fluids, the microstructures of the steels were not modified and variations in their microhardness (HV were minute.

  16. Considerations on the ASTM standards 1789-04 and 1422-05 on the forensic examination of ink.

    Science.gov (United States)

    Neumann, Cedric; Margot, Pierre

    2010-09-01

    The ASTM standards on Writing Ink Identification (ASTM 1789-04) and on Writing Ink Comparison (ASTM 1422-05) are the most up-to-date guidelines that have been published on the forensic analysis of ink. The aim of these documents is to cover most aspects of the forensic analysis of ink evidence, from the analysis of ink samples, the comparison of the analytical profile of these samples (with the aim to differentiate them or not), through to the interpretation of the result of the examination of these samples in a forensic context. Significant evolutions in the technology available to forensic scientists, in the quality assurance requirements brought onto them, and in the understanding of frameworks to interpret forensic evidence have been made in recent years. This article reviews the two standards in the light of these evolutions and proposes some practical improvements in terms of the standardization of the analyses, the comparison of ink samples, and the interpretation of ink examination. Some of these suggestions have already been included in a DHS funded project aimed at creating a digital ink library for the United States Secret Service. © 2010 American Academy of Forensic Sciences.

  17. Effects of Tempering Temperature and Path on the Microstructural and Mechanical Properties of ASTM Gr.92 Steel

    International Nuclear Information System (INIS)

    Han, C. H.; Baek, J. H.; Kim, S. H.; Lee, C. B.; Kim, Y. K.; Hong, S. I.

    2009-01-01

    SFR (Sodium-Cooled Fast Reactor) is one of the prospective nuclear reactor for the next generation (Gen-IV) systems. The fuel claddings in the SFR are subject to a high fast nuclear irradiation and a high temperature. Fuel technology is a key aspect of an SFR system, with implications for reactor safety, reactor operations, fuel reprocessing technology, and overall system economics. ASTM Gr.92 steel has been considered as the one of the main candidate fuel cladding materials in the design of SFR in that it has higher thermal conductivity as well as dimensional stability under irradiation when compared as austenitic stainless steel. The changes in microstructure and heat-treatment varying M 23 C 6 , MX, M 2 X, and precipitation by ASTM Gr.92 steels to improve high temperature mechanical properties is the attention. According to several researchers, it plays an important role in the mechanical properties of precipitates V, Nb, Cr, C, N as a form of MX and M 2 X precipitates. These fine precipitates formed in the sub- grain by preventing the movement of dislocations in high-temperature mechanical properties will contribute effectively. This study investigated the effects of tempering temperature and heat-treatment path on microstructure and mechanical properties of ASTM Gr.92 steels

  18. Sedação com sufentanil e clonidina em pacientes submetidos a cateterismo cardíaco

    Directory of Open Access Journals (Sweden)

    Anita Perpetua Carvalho Rocha

    2011-03-01

    Full Text Available FUNDAMENTO: A sedação para a realização de cateterismo cardíaco tem sido alvo de preocupação. Benzodiazepínicos, agonistas alfa-2 adrenérgicos e opioides são utilizados para esse fim, entretanto, cada um destes medicamentos possui vantagens e desvantagens. OBJETIVO: Avaliar a eficácia do sufentanil e da clonidina como sedativos em pacientes submetidos a cateterismo cardíaco, observando o impacto dos mesmos sobre os parâmetros hemodinâmicos e respiratórios, a presença de efeitos colaterais, além da satisfação do paciente e do hemodinamicista com o exame. MÉTODOS: Trata-se de um ensaio clínico prospectivo, duplo-cego, randomizado e controlado, que envolveu 60 pacientes que receberam 0,1 µg/kg de sufentanil ou 0,5 µg/kg de clonidina antes da realização do cateterismo cardíaco. O escore de sedação segundo a escala de Ramsay, a necessidade de utilização de midazolam, os efeitos colaterais, os parâmetros hemodinâmicos e respiratórios foram registrados, sendo os dados analisados em 06 diferentes momentos. RESULTADOS: O comportamento da pressão arterial, da frequência cardíaca e da frequência respiratória foi semelhante nos dois grupos, entretanto, no momento 2, os pacientes do grupo sufentanil (Grupo S apresentaram menor escore de sedação segundo a escala de Ramsay, e a saturação periférica da oxihemoglobina foi menor que o grupo clonidina (Grupo C no momento 6. Os pacientes do Grupo S apresentaram maior incidência de náusea e vômito pós-operatório que os pacientes do Grupo C. A satisfação dos pacientes foi maior no grupo clonidina. Os hemodinamicistas mostraram-se satisfeitos nos dois grupos. CONCLUSÃO: O sufentanil e a clonidina foram efetivos como sedativos em pacientes submetidos a cateterismo cardíaco.

  19. Manejo de las dislipidemias en pacientes cardíacos trasplantados. Hallazgos sobre nuevos factores de riesgo

    OpenAIRE

    Walter Masson; Norberto Vulcano; Sandra Fernández; Alberto Domenech; Ricardo Marenchino; Daniel Bracco; César Belziti

    2008-01-01

    En pacientes cardíacos trasplantados, el desarrollo de enfermedad vascular coronaria es una complicación frecuente y la dislipidemia es uno de los predictores más importantes. Los inmunosupresores predisponen a las dislipidemias y dificultan la utilización de hipolipemiantes. En este grupo particular de pacientes se recomienda alcanzar las metas terapéuticas de prevención secundaria. Las estatinas son los hipolipemiantes de elección. No existen recomendaciones claras sobre nuevos factores de ...

  20. Manejo de las dislipidemias en pacientes cardíacos trasplantados: Hallazgos sobre nuevos factores de riesgo

    OpenAIRE

    Masson, Walter; Vulcano, Norberto; Fernández, Sandra; Domenech, Alberto; Marenchino, Ricardo; Braccomtsac, Daniel; Belziti, César

    2008-01-01

    En pacientes cardíacos trasplantados, el desarrollo de enfermedad vascular coronaria es una complicación frecuente y la dislipidemia es uno de los predictores más importantes. Los inmunosupresores predisponen a las dislipidemias y dificultan la utilización de hipolipemiantes. En este grupo particular de pacientes se recomienda alcanzar las metas terapéuticas de prevención secundaria. Las estatinas son los hipolipemiantes de elección. No existen recomendaciones claras sobre nuevos factores de ...

  1. CO2 Measurements from Space: Lessons Learned from the Collaboration between the ACOS/OCO-2 and GOSAT Teams

    Science.gov (United States)

    Crisp, D.; Eldering, A.; Gunson, M. R.

    2012-12-01

    The NASA Orbiting Carbon Observatory (OCO) and the Japanese Greenhouse gases Observing SATellite (GOSAT) were the first two missions designed to collect space-based observations of the column-averaged CO2 dry air mole fraction, XCO2, with the sensitivity, coverage, and resolution needed to quantify CO2 fluxes on regional scales over the globe. The OCO and GOSAT teams formed a close collaboration during the development phases of these missions. After the loss of OCO, the GOSAT project team invited the OCO team to contribute to the analysis of measurements collected by the GOSAT Thermal And Near infrared Sensor for carbon Observations-Fourier Transform Spectrometer (TANSO-FTS). NASA responded by reformulating the OCO science team under the Atmospheric CO2 Observations from Space (ACOS) task to exploit this opportunity. This collaboration is providing an independent GOSAT XCO2 product, and valuable insights into the retrieval algorithms, calibration methods, and validation techniques that are being developed to analyze data anticipated the NASA Orbiting Carbon Observatory-2 (OCO-2). The ACOS/OCO-2 and GOSAT teams have conducted four, joint, vicarious calibration campaigns at Railroad Valley, Nevada to track the long-term radiometric performance of the TANSO-FTS instrument. The methods used in these campaigns evolved from those used to characterize the radiometric performance of high spatial resolution, imaging spectroradiometers. For TANSO-FTS, the conventional, surface based radiometric measurements have been augmented with surface and aircraft measurements of atmospheric temperature and trace gas profiles, as well as surface observations from MODIS and ASTER to characterize spatial variations of the surface reflectance within the (relatively large) sounding footprints. Similar methods will be needed for OCO-2. The ACOS/OCO-2 retrieval algorithm and associated data screening methods have been modified to estimate XCO2 from TANSO-FTS observations. Comparisons of TANSO

  2. Embrittlement of Intercritically Reheated Coarse Grain Heat-Affected Zone of ASTM4130 Steel

    Science.gov (United States)

    Li, Liying; Han, Tao; Han, Bin

    2018-04-01

    In this investigation, a thermal welding simulation technique was used to investigate the microstructures and mechanical properties of the intercritically reheated coarse grain heat-affected zone (IR CGHAZ) of ASTM4130 steel. The effect of post weld heat treatment (PWHT) on the toughness of IR CGHAZ was also analyzed. The toughness of IR CGHAZ was measured by means of Charpy impact, and it is found that IR CGHAZ has the lowest toughness which is much lower than that of the base metal regardless of whether PWHT is applied or not. The as-welded IR CGHAZ is mainly composed of ferrite, martensite, and many blocky M-A constituents distributing along grain boundaries and subgrain boundaries in a near-connected network. Also, the prior austenite grains are still as coarse as those in the coarse grain heat-affected zone (CGHAZ). The presence of the blocky M-A constituents and the coarsened austenite grains result in the toughness deterioration of the as-welded IR CGHAZ. Most of the blocky M-A constituents are decomposed to granular bainite due to the effect of the PWHT. However, PWHT cannot refine the prior austenite grains. Thus, the low toughness of IR CGHAZ after PWHT can be attributed to two factors, i.e., the coarsened austenite grains, and the presence of the remaining M-A constituents and granular bainite, which are located at grain boundaries and subgrain boundaries in a near-connected network. The absorbed energy of the IR CGHAZ was increased by about 3.75 times, which means that the PWHT can effectively improve the toughness but it cannot be recovered to the level of base metal.

  3. Fractionation and characterization of particles simulating wear of total joint replacement (TJR) following ASTM standards.

    Science.gov (United States)

    Saha, Subrata; Musib, Mrinal

    2011-01-01

    Reactions of bone cells to orthopedic wear debris produced by the articulating motion of total joint replacements (TJRs) are largely responsible for the long-term failure of such replacements. Metal and polyethylene (PE) wear particles isolated from fluids from total joint simulators, as well as particles that are fabricated by other methods, are widely used to study such in vitro cellular response. Prior investigations have revealed that cellular response to wear debris depends on the size, shape, and dose of the particles. Hence, to have a better understanding of the wear-mediated osteolytic process it is important that these particles are well characterized and clinically relevant, both qualitatively, and quantitatively. In this study we have fractionated both ultra-high molecular weight polyethylene (UHMWPE) and Ti particles, into micron (1.0-10.0 μm), submicron (0.2-1.0 μm), and nanoparticle (0.01-0.2 μm) fractions, and characterized them based on the following size-shape descriptors as put forth in ASTM F1877: i) equivalent circle diameter (ECD), ii) aspect ratio (AR), iii) elongation (E), iv) roundness (R), and v) form factor (FF). The mean (± SD) ECDs (in μm) for micron, submicron, and nanoparticles of UHMWPE were 1.652 ± 0.553, 0.270 ± 0.180, and 0.061 ± 0.035, respectively, and for Ti were 1.894 ± 0.667, 0.278 ± 0.180, and 0.055 ± 0.029, respectively. The values for other descriptors were similar (no statistically significant difference). The nanofraction particles were found to be more sphere-like (higher R and FF values, and lower E and AR values) as compared to larger particles. Future experiments will involve use of these well characterized particles for in vitro studies.

  4. Impacto del riesgo cardíaco sobre la Aneurismectomía

    Directory of Open Access Journals (Sweden)

    Orestes Díaz Hernández

    2000-04-01

    Full Text Available Se realiza un análisis cardiológico a 100 pacientes a los cuales se les efectuó cirugía electiva por aneurisma de la aorta abdominal infrarrenal; para esto se emplearon 5 métodos: el índice de riesgo cardíaco de Goldman original y modificado, los marcadores coronarios de Eagle, las indicaciones por niveles recomendadas por Hollier y la ecuación de Cooperman. La cardiopatía isquémica se detectó en el 59 % del total de los pacientes. De ellos, el 43 % tenía antecedentes de infarto del miocardio, el 33 % angina estable bajo tratamiento medicamentoso, el 6 % insuficiencia cardíaca congestiva con tratamiento digitálico y el 11 % un ritmo no sinusal detectado en el electrocardiograma. La supervivencia a largo plazo en la cardiopatía isquémica se comportó al año y 2 años en el 80 %, a los 5 años en el 72 % y a los 10 y 13 años en el 35 %. Se propone un algoritmo simple y modificado de valoración cardiológica en los pacientes que muestran aneurisma de la aorta abdominalA cardiological analysis of 100 patients whe underwent elective surgery due to infrarenal abdominal aortic aneurysm was made. 5 methods were used to this end: the original and modified Goldman´s cardiac resk index, Eagle´s coronary markers, the indications by levels recommended by Hollier and Cooperman´s equation. Ischaemic heart disease was detected in 59 % of the patients. 43 % of them had history of myocardial infarction, 33 % of stable angina under drug treatment, 6 % of congestive heart failure with digitalis treatment and 11 % had a nonsinusal rate detected in the EKG. Among those suffering from schemic heart disease there was a long term survival of 80 % at the lst and 2nd year, 72 % at the 5 th year, and 35 % at the 10th and 13th year. A simple and modified algorithm of cardiological assessment was proposed for patients with abdominal aortic aneurysm

  5. Transplante cardíaco ortotópico pela técnica bicaval

    Directory of Open Access Journals (Sweden)

    CHACCUR Paulo

    1997-01-01

    Full Text Available Há trinta anos tem sido empregada a técnica descrita por Lower e Shumway para o transplante cardíaco ortotópico, com bons resultados. Complicações, como estase venosa, formação de trombos, arritmias atriais e insuficiência das valvas tricúspide e mitral, estão presentes no pós-operatório tardio. A partir de 1995, passamos a utilizar a técnica bicaval em todos os casos (6 pacientes. Cinco eram do sexo masculino e a média de idades dos receptores era de 50,6 anos. A cardiomiopatia era dilatada e isquêmica em 2 casos cada, e chagásica e reumática nos demais. Três pacientes apresentavam operações prévias, sendo que um deles havia sido submetido a três operações de prótese valvar aórtica, o segundo a implante de marcapasso epimiocárdico definitivo, e o último a duas operações de revascularização do miocárdio associada a aneurismectomia de ventrículo esquerdo. A técnica cirúrgica consistiu, na maioria dos casos, na anastomose das veias pulmonares, em conjunto com o átrio esquerdo do coração a ser implantado e, a seguir, a da cava superior, inferior, do tronco pulmonar e aorta. Todos os doadores estavam em hospitais da cidade e com retirada múltipla de órgãos. Não tivemos óbito hospitalar e todos os pacientes estão vivos para um período de um a quinze meses de pós-operatório. Não houve diferença significativa quando se comparou as duas técnicas para o tempo de anóxia, tempo de C E C, tempo de implante, presença de taquiarritmias atriais, sangramento e permanência hospitalar. Houve diferença significativa (p<0,05 para a utilização de marcapasso temporário e presença de insuficiência tricúspide. Acreditamos que a técnica bicaval, além de reduzir o tamanho das cavidades atriais, é uma técnica simples, com índice menor de complicações e que poderá ser empregada com mais freqüência.

  6. Ensaios MSCR segundo as normas ASTM D7405-10a e AASHTO T350-14: um estudo de caso envolvendo ligantes asfálticos modificados

    Directory of Open Access Journals (Sweden)

    Matheus David Inocente Domingos

    2016-12-01

    especially the AC+rubber and the AC+rubber+PPA. The AC+PPA showed low stress sensitivity and the best results for the parameters R and Jnr at 3,200 Pa either in the ASTM or the AASHTO protocols, which justifies its choice as the best formulation. The data from the modified asphalt binders suggest that the change from the ASTM protocol to the AASHTO one is recommended.

  7. Interacciones entre dispositivos cardíacos implantables y modalidades fisioterapéuticas: ¿Mito o realidad?

    Directory of Open Access Journals (Sweden)

    Genevieve C. Digby

    2011-04-01

    Full Text Available La fisioterapia se ha transformado en una especialidad que claramente incide en la calidad de vida de nuestros pacientes. En poblaciones añosas, el uso de fisioterapia incluye múltiples modalidades para un alto número de distintas enfermedades. Varios informes sobre posibles interacciones negativas entre las distintas modalidades de fisioterapia y los dispositivos cardíacos implantables (marcapasos y cardiodesfibriladores han sido publicados en los últimos aňos. A pesar de ello, existe muy poca evidencia y guías precisas para identificar cuáles son las modalidades de fisioterapia seguras a utilizar en esta población de pacientes. En la siguiente revisión, nos propusimos resumir las interacciones documentadas entre fisioterapia y dispositivos cardíacos implantables (DCI, discutir el estándar actual de estas prácticas e identificar las principales consideraciones que existen desde la perspectiva de un servicio de electrofisiología cardíaca, para el tratamiento adecuado en estos pacientes. Finalmente, abogamos por fortalecer la colaboración entre fisioterapeutas y electrofisiólogos, con el fin de asegurar una óptima y segura atención de este grupo de pacientes.

  8. Quantifying Spatiotemporal Dynamics of Solar Radiation over the Northeast China Based on ACO-BPNN Model and Intensity Analysis

    Directory of Open Access Journals (Sweden)

    Xiangqian Li

    2017-01-01

    Full Text Available Reliable information on the spatiotemporal dynamics of solar radiation plays a crucial role in studies relating to global climate change. In this study, a new backpropagation neural network (BPNN model optimized with an Ant Colony Optimization (ACO algorithm was developed to generate the ACO-BPNN model, which had demonstrated superior performance for simulating solar radiation compared to traditional BPNN modelling, for Northeast China. On this basis, we applied an intensity analysis to investigate the spatiotemporal variation of solar radiation from 1982 to 2010 over the study region at three levels: interval, category, and conversion. Research findings revealed that (1 the solar radiation resource in the study region increased from the 1980s to the 2000s and the average annual rate of variation from the 1980s to the 1990s was lower than that from the 1990s to the 2000s and (2 the gains and losses of solar radiation at each level were in different conditions. The poor, normal, and comparatively abundant levels were transferred to higher levels, whereas the abundant level was transferred to lower levels. We believe our findings contribute to implementing ad hoc energy management strategies to optimize the use of solar radiation resources and provide scientific suggestions for policy planning.

  9. Manejo de las dislipidemias en pacientes cardíacos trasplantados. Hallazgos sobre nuevos factores de riesgo

    Directory of Open Access Journals (Sweden)

    Walter Masson

    2008-01-01

    Full Text Available En pacientes cardíacos trasplantados, el desarrollo de enfermedad vascular coronaria es una complicación frecuente y la dislipidemia es uno de los predictores más importantes. Los inmunosupresores predisponen a las dislipidemias y dificultan la utilización de hipolipemiantes. En este grupo particular de pacientes se recomienda alcanzar las metas terapéuticas de prevención secundaria. Las estatinas son los hipolipemiantes de elección. No existen recomendaciones claras sobre nuevos factores de riesgo, como la homocisteína y la lipoproteína (a [Lp(a].Con el objetivo de conocer el perfil lipídico, la prevalencia de homocisteinemia y de Lp(a elevadas, el cumplimiento de las metas terapéuticas y la tolerancia a la medicación, se incluyeron en el estudio 23 pacientes cardíacos trasplantados. Los resultados mostraron que el cumplimiento de las metas lipídicas fue aceptable y que el 65% recibía tratamiento hipolipemiante. El uso de estatinas fue seguro. Se encontró una prevalencia alta de homocisteína y Lp(a elevadas. Su implicación en la modificación del tratamiento se desconoce.

  10. Transient absorption spectroscopy in biology using the Super-ACO storage ring FEL and the synchrotron radiation combination

    International Nuclear Information System (INIS)

    Renault, Eric; Nahon, Laurent; Garzella, David; Nutarelli, Daniele; De Ninno, Giovanni; Hirsch, Matthias; Couprie, Marie Emmanuelle

    2001-01-01

    The Super-ACO storage ring FEL, covering the UV range down to 300 nm with a high average power (300 mW at 350 nm) together with a high stability and long lifetime, is a unique tool for the performance of users applications. We present here the first pump-probe two color experiments on biological species using a storage ring FEL coupled to the synchrotron radiation. The intense UV pulse of the Super-ACO FEL is used to prepare a high initial concentration of chromophores in their first singlet electronic excited state. The nearby bending magnet synchrotron radiation provides, on the other hand a pulsed, white light continuum (UV-IR), naturally synchronized with the FEL pulses and used to probe the photochemical subsequent events and the associated transient species. We have demonstrated the feasibility with a dye molecule (POPOP) observing a two-color effect, signature of excited state absorption and a temporal signature with Acridine. Applications on various chromophores of biological interest are carried out, such as the time-resolved absorption study of the first excited state of Acridine

  11. Transient absorption spectroscopy in biology using the Super-ACO storage ring FEL and the synchrotron radiation combination

    CERN Document Server

    Renault, E; De Ninno, G; Garzella, D; Hirsch, M; Nahon, L; Nutarelli, D

    2001-01-01

    The Super-ACO storage ring FEL, covering the UV range down to 300 nm with a high average power (300 mW at 350 nm) together with a high stability and long lifetime, is a unique tool for the performance of users applications. We present here the first pump-probe two color experiments on biological species using a storage ring FEL coupled to the synchrotron radiation. The intense UV pulse of the Super-ACO FEL is used to prepare a high initial concentration of chromophores in their first singlet electronic excited state. The nearby bending magnet synchrotron radiation provides, on the other hand a pulsed, white light continuum (UV-IR), naturally synchronized with the FEL pulses and used to probe the photochemical subsequent events and the associated transient species. We have demonstrated the feasibility with a dye molecule (POPOP) observing a two-color effect, signature of excited state absorption and a temporal signature with Acridine. Applications on various chromophores of biological interest are carried out,...

  12. Mensuração do tamanho cardíaco em radiografias de gatos com hipertireoidismo experimental

    Directory of Open Access Journals (Sweden)

    Mauro José Lahm Cardoso

    2007-04-01

    Full Text Available O hipertireoidismo felino ou tireotoxicose é a doença endócrina mais freqüente em gatos domésticos. O hipertireoidismo felino é uma desordem multissistêmica associada com aumento das concentrações dos hormônios tireoidianos circulantes, triidotironina (T3 e tiroxina (T4. Anormalidades cardiovasculares em gatos com hipertireoidismo espontâneo já foram bem descritas. O objetivo deste trabalho foi realizar a mensuração cardíaca em 19 gatos submetidos a tireotoxicose experimental, utilizando o "vertebral heart size" (VHS. A mensuração utilizando o VHS foi realizada a partir de radiografias torácicas lateral, dorsoventral e ventrodorsal. As radiografias torácicas laterais foram mais eficazes do que as ventrodorsal e dorsoventral em ilustrar o aumento progressivo do coração. O VHS é um método fácil de ser usado, permitindo a avaliação do tamanho cardíaco em gatos hipertireóideos, e facilita a identificação de cardiomegalia e progressão do tamanho cardíaco.

  13. ASTM and ASME-BPE Standards--Complying with the Needs of the Pharmaceutical Industry.

    Science.gov (United States)

    Huitt, William M

    2011-01-01

    Designing and building a pharmaceutical facility requires the owner, engineer of record, and constructor to be knowledgeable with regard to the industry codes and standards that apply to this effort. Up until 1997 there were no industry standards directed at the needs and requirements of the pharmaceutical industry. Prior to that time it was a patchwork effort at resourcing and adopting nonpharmaceutical-related codes and standards and then modifying them in order to meet the more stringent requirements of the Food and Drug Administration (FDA). In 1997 the American Society of Mechanical Engineers (ASME) published the first Bioprocessing Equipment (BPE) Standard. Through harmonization efforts this relatively new standard has brought together, scrutinized, and refined industry accepted methodologies together with FDA compliance requirements, and has established an American National Standard that provides a comprehensive set of standards that are integral to the pharmaceutical industry. This article describes various American National Standards, including those developed and published by the American Society for Testing and Materials (ASTM), and how they apply to the pharmaceutical industry. It goes on to discuss the harmonization effort that takes place between the various standards developers in an attempt to prevent conflicts and omissions between the many standards. Also included are examples of tables and figures taken from the ASME-BPE Standard. These examples provide the reader with insight to the relevant content of the ASME-BPE Standard. Designing and building a pharmaceutical facility requires the owner, engineer of record, and constructor to be knowledgeable with regard to the industry codes and standards that apply to this effort. Up until 1997 there were no industry standards directed at the needs and requirements of the pharmaceutical industry. Prior to that time it was a patchwork effort at resourcing and adopting nonpharmaceutical-related codes and

  14. Experiencia con hipotermia terapéutica en el paro cardíaco extrahospitalario

    Directory of Open Access Journals (Sweden)

    Ricardo Levin

    2016-01-01

    Full Text Available Introducción: El paro cardíaco extrahospitalario (PCEH, una de las principales causas de mortalidad en el mundo occidental, se asocia con una muy baja sobrevida hospitalaria y con un número elevado de secuelas neurológicas entre los sobrevivientes, sin modificaciones significativas en el pronóstico en las últimas tres décadas. Estudios clínicos más recientes plantearon la utilidad de la hipotermia terapéutica en la reducción de la mortalidad y el grado de deterioro neurológico en sobrevivientes de un PCEH. Objetivos: Evaluar la mortalidad y el resultado neurológico de pacientes comatosos resucitados de un PCEH tratados con hipotermia terapéutica. Considerar las indicaciones y los hallazgos de la cinecoronariografía y detectar complicaciones asociadas con la hipotermia. Material y métodos: Se incluyeron pacientes resucitados de un PCEH tratados bajo hipotermia terapéutica, que consistió en una fase de enfriamiento a 33 °C, un mantenimiento durante 24 horas y recalentamiento a 0,25 °C/hora. Se analizaron las indicaciones y los hallazgos de la cinecoronariografía. Se evaluaron complicaciones metabólicas, arrítmicas, infecciosas y hemorrágicas. Se consideró significativo valor de p menor de 0,05. Resultados: De los 213 pacientes incluidos, la sobrevida hospitalaria fue de 109 pacientes (51,2%, de los que 96 (46,1% presentaron al egreso buena recuperación neurológica. Se observó mayor sobrevida en pacientes con ritmos pasibles de desfibrilación respecto de aquellos con ritmos no pasibles de desfibrilación (58,2% vs. 37,7%; p = 0,007. Se derivaron (3,5 horas en promedio a cinecoronariografía 147 (69% pacientes, de los cuales 121 (82,3% mostraron enfermedad significativa, observándose en 69 (57% oclusión coronaria completa. Ciento siete pacientes fueron sometidos a angioplastia; 43 (40,2% de ellos fallecieron durante la internación frente a 61 (58,6% óbitos entre los no intervenidos o no estudiados (p = 0,005. Entre

  15. Intelligent Search Method Based ACO Techniques for a Multistage Decision Problem EDP/LFP

    Directory of Open Access Journals (Sweden)

    Mostefa RAHLI

    2006-07-01

    the algorithm getting to him a rate preferably more or less justifiable. In operational research, this subject is known under the name of CPO [14] (combinatory problem optimization.The choice of a numerical method to use for a merged case study and calculation of the LFP/Fitting/EDP what is [7, 8, 9, 10, 18, 19, 20] (in theoretical form of a problem compensates the final decision to adopt and a strategy of optimal production (which is a practical problem form and the final task most wanted.Each method is imposed by:· The algorithm complexity.· In an application gathering all calculations, the number of uses of method compared to the total number of later issues.· The maximum number of iterations for a given use.· The maximum iterations count allowed for this algorithm kind.· The limitations of the algorithm such as: applicability of a method (algorithm adapted or not to the problem; does the problem constrained or not; problem dimension or order N (N ≤ Nmax; the algorithm stability.It's well-known that for an approached calculation method, the propagation of errors strongly conditions the need of making its adequate choice and if it can be adopted compared to others for the same area.More is the number of the elementary operations is large more the final result misses precision and especially if the finality of the study is a responsible decision to make and a satisfaction of constraints and multiple conditions. Our study proposes an inference based solution (AI with the use of ACO technique (Ant colony Optimization2.

  16. ASTM E 1559 method for measuring material outgassing/deposition kinetics has applications to aerospace, electronics, and semiconductor industries

    Science.gov (United States)

    Garrett, J. W.; Glassford, A. P. M.; Steakley, J. M.

    1994-01-01

    The American Society for Testing and Materials has published a new standard test method for characterizing time and temperature-dependence of material outgassing kinetics and the deposition kinetics of outgassed species on surfaces at various temperatures. This new ASTM standard, E 1559(1), uses the quartz crystal microbalance (QCM) collection measurement approach. The test method was originally developed under a program sponsored by the United States Air Force Materials Laboratory (AFML) to create a standard test method for obtaining outgassing and deposition kinetics data for spacecraft materials. Standardization by ASTM recognizes that the method has applications beyond aerospace. In particular, the method will provide data of use to the electronics, semiconductor, and high vacuum industries. In ASTM E 1559 the material sample is held in vacuum in a temperature-controlled effusion cell, while its outgassing flux impinges on several QCM's which view the orifice of the effusion cell. Sample isothermal total mass loss (TML) is measured as a function of time from the mass collected on one of the QCM's which is cooled by liquid nitrogen, and the view factor from this QCM to the cell. The amount of outgassed volatile condensable material (VCM) on surfaces at higher temperatures is measured as a function of time during the isothermal outgassing test by controlling the temperatures of the remaining QCM's to selected values. The VCM on surfaces at temperatures in between those of the collector QCM's is determined at the end of the isothermal test by heating the QCM's at a controlled rate and measuring the mass loss from the end of the QCM's as a function of time and temperature. This reevaporation of the deposit collected on the QCM's is referred to as QCM thermogravimetric analysis. Isothermal outgassing and deposition rates can be determined by differentiating the isothermal TML and VCM data, respectively, while the evaporation rates of the species can be obtained as a

  17. Investigating the effect of coil model losses on computational electromagnetic exposure of an ASTM phantom at 64 MHz MRI.

    Science.gov (United States)

    Kozlov, Mikhail; Horner, Marc; Kainz, Wolfgang; Angelone, Leonardo M

    2017-07-01

    The goal of this work is to investigate the effect of coil losses on the electromagnetic field generated in an ASTM phantom by a birdcage coil. The study was based on different numerical implementations of an RF body coil at 64 MHz, using the same 3D EM and RF circuit co-simulation procedure. The coil quality factor was evaluated with respect to losses due to power feed mismatch and to resistive losses of the coil components. The results of the study showed that the magnetic field at the coil iso-center, normalized to the square root of the whole body specific absorption rate, depends on the coil quality factor.

  18. The fatigue-crack propagation behavior of ASTM A533-B steel tested in vacuo at LWR operating temperatures

    International Nuclear Information System (INIS)

    James, L.A.

    1987-01-01

    The fatigue-crack propagation (FCP) behavior of ASTM A533-B-1 steel was characterized in vacuo at 288 0 C. Tests were conducted at two stress ratios: R = 0.05 and R = 0.7. Results of these tests were compared with results from previous studies for the same type of steel tested in an air environment, and FCP rates in vacuo were generally lower than those in air. Stress ratio effects in vacuo were not as great as those in air, and both stress ratio effects and environmental effects are discussed from the standpoint of crack closure concepts

  19. Cor ASTM: um método simples e rápido para determinar a qualidade do biodiesel produzido a partir de óleos residuais de fritura ASTM color: a simple and fast method for determining quality of biodiesel produced from used cooking oils

    Directory of Open Access Journals (Sweden)

    Verônica Santos de Morais

    2013-01-01

    Full Text Available In this study, 23 biodiesel samples were produced, 20 from used cooking oil and the remaining 3 from refined soybean oil. The following properties were determined in all of the samples (oil and its respective biodiesel: density; viscosity; total acid number and ASTM color. The results indicated high correlation (R > 0.6 between ASTM color of used cooking oil and total acid number of its resultant biodiesel. This high correlation allows prediction of the quality of the biodiesel produced using a simple and fast procedure such as ASTM color.

  20. Expression Study of LeGAPDH, LeACO1, LeACS1A, and LeACS2 in Tomato Fruit (Solanum lycopersicum

    Directory of Open Access Journals (Sweden)

    Pijar Riza Anugerah

    2015-10-01

    Full Text Available Tomato is a climacteric fruit, which is characterized by ripening-related increase of respiration and elevated ethylene synthesis. Ethylene is the key hormone in ripening process of climacteric fruits. The objective of this research is to study the expression of three ethylene synthesis genes: LeACO1, LeACS1A, LeACS2, and a housekeeping gene LeGAPDH in ripening tomato fruit. Specific primers have been designed to amplify complementary DNA fragment of LeGAPDH (143 bp, LeACO1 (240 bp, LeACS1A (169 bp, and LeACS2 (148 bp using polymerase chain reaction. Nucleotide BLAST results of the complementary DNA fragments show high similarity with LeGAPDH (NM_001247874.1, LeACO1 (NM_001247095.1, LeACS1A (NM_001246993.1, LeACS2 (NM_001247249.1, respectively. Expression study showed that LeACO1, LeACS1A, LeACS2, and LeGAPDH genes were expressed in ripening tomato fruit. Isolation methods, reference sequences, and primers used in this study can be used in future experiments to study expression of genes responsible for ethylene synthesis using quantitative polymerase chain reaction and to design better strategy for controlling fruit ripening in agroindustry.

  1. Hacia una descripción del cuento policíaco español contemporáneo

    Directory of Open Access Journals (Sweden)

    Alicia Valverde Velasco

    2014-06-01

    Full Text Available Desde su recepción en España, ya en el siglo XIX, el cuento policíaco nunca había experimentado un auge en su cultivo y aceptación como el acaecido a partir de los años setenta. Desde entonces, el cuento literario, como forma narrativa susceptible de desarrollar tramas de muy distinta índole, entre ellas la del hecho criminal, ha experimentado un período de reconocimiento paulatino por parte de los autores, las editoriales, el público y la crítica, por lo que no es de extrañar que los escritores del llamado “género criminal” se atreviesen a explorar las posibilidades del relato breve con mayor fortuna que durante las décadas precedentes.

  2. Citrus CitNAC62 cooperates with CitWRKY1 to participate in citric acid degradation via up-regulation of CitAco3.

    Science.gov (United States)

    Li, Shao-Jia; Yin, Xue-Ren; Wang, Wen-Li; Liu, Xiao-Fen; Zhang, Bo; Chen, Kun-Song

    2017-06-15

    Citric acid is the predominant organic acid of citrus fruit. Degradation of citric acid occurs during fruit development, influencing fruit acidity. Associations of CitAco3 transcripts and citric acid degradation have been reported for citrus fruit. Here, transient overexpression of CitAco3 significantly reduced the citric acid content of citrus leaves and fruits. Using dual luciferase assays, it was shown that CitNAC62 and CitWRKY1 could transactivate the promoter of CitAco3. Subcellular localization results showed that CitWRKY1 was located in the nucleus and CitNAC62 was not. Yeast two-hybrid analysis and bimolecular fluorescence complementation (BiFC) assays indicated that the two differently located transcription factors could interact with each other. Furthermore, BiFC showed that the protein-protein interaction occurred only in the nucleus, indicating the potential mobility of CitNAC62 in plant cells. A synergistic effect on citrate content was observed between CitNAC62 and CitWRKY1. Transient overexpression of CitNAC62 or CitWRKY1 led to significantly lower citrate content in citrus fruit. The combined expression of CitNAC62 and CitWRKY1 resulted in lower citrate content compared with the expression of CitNAC62 or CitWRKY1 alone. The transcript abundance of CitAco3 was consistent with the citrate content. Thus, we propose that a complex of CitWRKY1 and CitNAC62 contributes to citric acid degradation in citrus fruit, potentially via modulation of CitAco3. © The Author 2017. Published by Oxford University Press on behalf of the Society for Experimental Biology.

  3. Certeza diagnóstica en la mortalidad de una población de pacientes con trasplante cardíaco

    Directory of Open Access Journals (Sweden)

    Marcos Amuchástegui

    2008-01-01

    Full Text Available RESUMENIntroducciónA pesar de que la morbimortalidad en el trasplante cardíaco ha sido motivo de extensoanálisis, la mayoría de los estudios y registros de mortalidad en pacientes trasplantados sebasan sobre datos clínicos. En la bibliografía existen comunicaciones aisladas de autopsiasen pacientes con trasplante cardíaco.ObjetivoDeterminar la importancia de la realización de estudios anatomopatológicos para el diagnósticode causa de muerte en un programa de trasplante cardíaco.Material y métodosSe incluyeron todos los pacientes con trasplante cardíaco fallecidos entre enero 1990 y enero2005. El diagnóstico definitivo de la causa de muerte fue corroborado por autopsia obiopsia de órgano sólido. Las causas de muerte evaluadas fueron falla precoz del injerto,rechazo celular, infección, enfermedad vascular del injerto, neoplasia y otros.ResultadosDurante el período en estudio 73 pacientes fueron sometidos a trasplante cardíaco; de ellos,fallecieron 31. Se obtuvieron 12 autopsias y 7 biopsias de órgano sólido que certificaron lacausa de muerte (61%. La causa de muerte más frecuente fue el rechazo celular mayor degrado III. En el 12,9%, la anatomía patológica difirió de la sospecha clínica de la causa demuerte.ConclusiónLa información clinicopatológica derivada de estudios post mortem es un indicador de nuestrarealidad asistencial y se constituye en un pilar fundamental para el conocimiento y elmanejo futuro de los pacientes trasplantados, por lo que consideramos que la realización deautopsias en estos pacientes es de vital importancia.REV ARGENT CARDIOL 2008;76:292-294.

  4. Moessbauer spectroscopy study on the corrosion resistance of plasma nitrided ASTM F138 stainless steel in chloride solution

    International Nuclear Information System (INIS)

    Souza, S.D. de; Olzon-Dionysio, M.; Basso, R.L.O.; Souza, S. de

    2010-01-01

    Plasma nitriding of ASTM F138 stainless steel samples has been carried out using dc glow discharge under 80% H 2 -20% N 2 gas mixture, at 673 K, and 2, 4, and 7 h time intervals, in order to investigate the influence of treatment time on the microstructure and the corrosion resistance properties. The samples were characterized by scanning electron microscopy, glancing angle X-ray diffraction and conversion electron Moessbauer spectroscopy, besides electrochemical tests in NaCl aerated solution. A modified layer of about 6 μm was observed for all the nitrided samples, independent of nitriding time. The X-ray diffraction analysis shows broad γ N phase peaks, signifying a great degree of nitrogen supersaturation. Besides γ N, the Moessbauer spectroscopy results indicated the occurrence of γ' and ε phases, as well as some other less important phases. Corrosion measurements demonstrate that the plasma nitriding time affects the corrosion resistance and the best performance is reached at 4 h treatment. It seems that the ε/γ' fraction ratio plays an important role on the resistance corrosion. Additionally, the Moessbauer spectroscopy was decisive in this study, since it was able to identify and quantify the iron phases that influence the corrosion resistance of plasma nitrided ASTM F138 samples.

  5. Development of ASTM Standard for SiC-SiC Joint Testing Final Scientific/Technical Report

    Energy Technology Data Exchange (ETDEWEB)

    Jacobsen, George [General Atomics, San Diego, CA (United States); Back, Christina [General Atomics, San Diego, CA (United States)

    2015-10-30

    As the nuclear industry moves to advanced ceramic based materials for cladding and core structural materials for a variety of advanced reactors, new standards and test methods are required for material development and licensing purposes. For example, General Atomics (GA) is actively developing silicon carbide (SiC) based composite cladding (SiC-SiC) for its Energy Multiplier Module (EM2), a high efficiency gas cooled fast reactor. Through DOE funding via the advanced reactor concept program, GA developed a new test method for the nominal joint strength of an endplug sealed to advanced ceramic tubes, Fig. 1-1, at ambient and elevated temperatures called the endplug pushout (EPPO) test. This test utilizes widely available universal mechanical testers coupled with clam shell heaters, and specimen size is relatively small, making it a viable post irradiation test method. The culmination of this effort was a draft of an ASTM test standard that will be submitted for approval to the ASTM C28 ceramic committee. Once the standard has been vetted by the ceramics test community, an industry wide standard methodology to test joined tubular ceramic components will be available for the entire nuclear materials community.

  6. Measurement of susceptibility artifacts with histogram-based reference value on magnetic resonance images according to standard ASTM F2119.

    Science.gov (United States)

    Heinrich, Andreas; Teichgräber, Ulf K; Güttler, Felix V

    2015-12-01

    The standard ASTM F2119 describes a test method for measuring the size of a susceptibility artifact based on the example of a passive implant. A pixel in an image is considered to be a part of an image artifact if the intensity is changed by at least 30% in the presence of a test object, compared to a reference image in which the test object is absent (reference value). The aim of this paper is to simplify and accelerate the test method using a histogram-based reference value. Four test objects were scanned parallel and perpendicular to the main magnetic field, and the largest susceptibility artifacts were measured using two methods of reference value determination (reference image-based and histogram-based reference value). The results between both methods were compared using the Mann-Whitney U-test. The difference between both reference values was 42.35 ± 23.66. The difference of artifact size was 0.64 ± 0.69 mm. The artifact sizes of both methods did not show significant differences; the p-value of the Mann-Whitney U-test was between 0.710 and 0.521. A standard-conform method for a rapid, objective, and reproducible evaluation of susceptibility artifacts could be implemented. The result of the histogram-based method does not significantly differ from the ASTM-conform method.

  7. An investigation of force components in orthogonal cutting of medical grade cobalt-chromium alloy (ASTM F1537).

    Science.gov (United States)

    Baron, Szymon; Ahearne, Eamonn

    2017-04-01

    An ageing population, increased physical activity and obesity are identified as lifestyle changes that are contributing to the ongoing growth in the use of in-vivo prosthetics for total hip and knee arthroplasty. Cobalt-chromium-molybdenum (Co-Cr-Mo) alloys, due to their mechanical properties and excellent biocompatibility, qualify as a class of materials that meet the stringent functional requirements of these devices. To cost effectively assure the required dimensional and geometric tolerances, manufacturers rely on high-precision machining. However, a comprehensive literature review has shown that there has been limited research into the fundamental mechanisms in mechanical cutting of these alloys. This article reports on the determination of the basic cutting-force coefficients in orthogonal cutting of medical grade Co-Cr-Mo alloy ASTM F1537 over an extended range of cutting speeds ([Formula: see text]) and levels of undeformed chip thickness ([Formula: see text]). A detailed characterisation of the segmented chip morphology over this range is also reported, allowing for an estimation of the shear plane angle and, overall, providing a basis for macro-mechanic modelling of more complex cutting processes. The results are compared with a baseline medical grade titanium alloy, Ti-6Al-4V ASTM F136, and it is shown that the tangential and thrust-force components generated were, respectively, ≈35% and ≈84% higher, depending primarily on undeformed chip thickness but with some influence of the cutting speed.

  8. Anodic Protection performance of Steels ASTM A 516-60 And JIS G 3131 SPHC In Concentrated Sulfuric Acid

    International Nuclear Information System (INIS)

    Harsisto; Ginting, Immanuel; Eddy, D.C

    2001-01-01

    One of the methods to protect a carbon steel material from corrosion attack of sulfuric acid environment is with anodic protection. This research was intended to investigate the effect of anodic protection quickened with potential polarization, The material under investigation were ASTM A 516 and JIS G 3131-SPHC in highly concentrated H 2 SO 4 solution. The results showed that potential that was effective for anodic protection in ASTM A 516-60 were at 236-436 mV for 75%, 276-476 mV for 80%, 264-514 mV for 85%,285-485 mV for 90%, and 231-431 mV for 97% H 2 SO 4 so that in JlS G 3131-SPHC were at 303 -503 mV for 75%, 290-490 mV for 80%, 269- 516 mV for 85%, 264-514 mV for 90%, and 287 -487 mV for 97% H 2 SO 4

  9. Experimental and numerical study of a modified ASTM C633 adhesion test for strongly-bonded coatings

    Energy Technology Data Exchange (ETDEWEB)

    Bernardie, Raphaëlle; Berkouch, Reda; Valette, Stéphane; Absi, Joseph; Lefort, Pierre [University of Limoges, Limoges Cedex (France)

    2017-07-15

    When coatings are strongly bonded to their substrates it is often difficult to measure the adhesion values. The proposed method, which is suggested naming “silver print test”, consists in covering the central part of the samples with a thin layer of silver paint, before coating. The process used for testing this new method was the Air plasma spraying (APS), and the materials used were alumina coatings on C35 steel substrates, previously pre-oxidized in CO{sub 2}. The silver painted area was composed of small grains that did not oxidize but that significantly sintered during the APS process. The silver layer reduced the surface where the coating was linked to the substrate, which allowed its debonding, using the classical adhesion test ASTM C633-13, while the direct use of this test (without silver painting) led to ruptures inside the glue used in this test. The numerical modelling, based on the finite element method with the ABAQUS software, provided results in good agreement with the experimental measurements. This concordance validated the used method and allowed accessing to the values of adherence when the experimental test ASTM C633-13 failed, because of ruptures in the glue. After standardization, the “silver print test” might be used for other kinds of deposition methods, such as PVD, CVD, PECVD.

  10. Use of Bayesian Methods to Analyze and Visualize Content Uniformity Capability Versus United States Pharmacopeia and ASTM Standards.

    Science.gov (United States)

    Hofer, Jeffrey D; Rauk, Adam P

    2017-02-01

    The purpose of this work was to develop a straightforward and robust approach to analyze and summarize the ability of content uniformity data to meet different criteria. A robust Bayesian statistical analysis methodology is presented which provides a concise and easily interpretable visual summary of the content uniformity analysis results. The visualization displays individual batch analysis results and shows whether there is high confidence that different content uniformity criteria could be met a high percentage of the time in the future. The 3 tests assessed are as follows: (a) United States Pharmacopeia Uniformity of Dosage Units , (b) a specific ASTM E2810 Sampling Plan 1 criterion to potentially be used for routine release testing, and (c) another specific ASTM E2810 Sampling Plan 2 criterion to potentially be used for process validation. The approach shown here could readily be used to create similar result summaries for other potential criteria. Copyright © 2017 American Pharmacists Association®. Published by Elsevier Inc. All rights reserved.

  11. Effect of C content on the mechanical properties of solution treated as-cast ASTM F-75 alloys.

    Science.gov (United States)

    Herrera, M; Espinoza, A; Méndez, J; Castro, M; López, J; Rendón, J

    2005-07-01

    The mechanical properties of solution treated ASTM F-75 alloys with various carbon contents have been studied. Alloys cast under the same conditions were subjected to solution treatment for several periods and then their tensile properties were evaluated. In the as-cast conditions, the alloys exhibited higher strength values with increasing carbon content whereas their ductility was not significantly affected. For the solution treated alloys, the variation of the strength was characterized by a progressive increase for short treatment times until a maximum value was achieved, which was followed by a diminution in this property for longer treatment times. This behavior was more accentuated for the case of the alloys with medium carbon contents, which also exhibited the highest values of strength. Furthermore, the alloy's ductility was enhanced progressively with increasing solution treatment time. This improvement in ductility was significantly higher for the medium carbon alloys compared with the rest of the studied alloys. Thus, high and low carbon contents in solution treated ASTM F-75 alloys did not produced sufficiently high tensile properties.

  12. Transplante cardíaco e infecção Cardiac transplantation and infection

    Directory of Open Access Journals (Sweden)

    Wilson José COUTO

    2001-06-01

    Full Text Available Objetivo: O presente estudo visa avaliar a incidência de infecções, os agentes etiológicos, e a apresentação clínica e a morbi-mortalidade operatória nos pacientes submetidos a transplante cardíaco na Universidade Federal de São Paulo. Casuística e Métodos: No período de novembro de 1996 a junho de 1998, 97 pacientes transplantados pela equipe de Cirurgia Cardiovascular da UNIFESP sobreviveram por período superior a uma semana após o transplante e foram analisados, retrospectivamente, quanto aos processos infecciosos diagnosticados. A idade dos pacientes variou de 3 a 63 anos (média de 44,4 ± 13,0 anos, sendo que a maioria apresentava miocardiopatia dilatada (46, seguida de chagásica (24 e isquêmica (23. O tempo de seguimento variou de 0,33 a 119 meses (36 ± 30,7 meses. Resultados: Dos 97 pacientes estudados, 16 (16,4% morreram, sendo infecção a principal causa, seguido pela rejeição em 10 (10,30%. As causas de óbito por infecção foram: sepse bacteriana em 6 pacientes, pneumonia em outros 6, infecção intra-abdominal em 2, toxoplasmose disseminada em 1 e infecção pelo citomegalovírus em 1. Ocorreram 142 episódios infecciosos diagnosticados distribuídos da seguinte forma: bacterianos 76 (52,5%; virais 34 (28,8%; fúngicos 20 (17,5% e protozoários 12 (12,4%. Houve 8 episódios de reativação da doença de Chagas (média 4,9 meses após o transplante diagnosticados principalmente através do aparecimento de nódulos subcutâneos. Todos os casos de reativação foram tratados com alopurinol e evoluíram bem. Conclusão: Os dados apresentados mostraram o predomínio de infecções bacterianas que causaram maior mortalidade. Nos transplantados por doença de Chagas a reativação da doença pode ser controlada adequadamente com uso de alopurinol. Os dados são importantes para orientação em nossa comunidade dos programas de transplantes, uma vez que traz à tona particularidades do nosso meio.Objective: To evaluate

  13. Estimación del gasto cardíaco: Utilidad en la práctica clínica. Monitorización disponible invasiva y no invasiva

    OpenAIRE

    García, X.; Mateu, L.; Maynar, J.; Mercadal, J.; Ochagavía, A.; Ferrandiz, A.

    2011-01-01

    Esta revisión pretende profundizar en el conocimiento del gasto cardíaco, sus variables y sus condicionantes, así como repasar exhaustivamente las diferentes técnicas disponibles para su monitorización y establecer las situaciones en que el conocimiento del gasto cardíaco nos aporta una información fundamental en el manejo del paciente crítico. La técnica de Fick, utilizada en los inicios para calcular el gasto cardíaco de los pacientes, ha sido sustituida hoy en día en la práctica clínica po...

  14. Autotransplante cardíaco: um novo método no tratamento de problemas cardíacos complexos Heart autotransplantation: a new technique to complex intracardiac reppairs

    Directory of Open Access Journals (Sweden)

    Randas J. V Batista

    1995-06-01

    Full Text Available No período de janeiro de 1990 a maio de 1995 foram operados com a técnica do autotransplante cardíaco 92 pacientes com cardiopatias complexas e arritmias supraventriculares, principalmente fibrilação atrial (n=89, reentrada (n=2, QT longo (n=1. O sexo feminino predominou (n=63. A idade variou de 18 a 76 anos (m=43. Os defeitos concomitantes foram: átrio esquerdo gigante (medido pelo ecocardiograma > 6 cm (n=65; átrio direito gigante (n=9; átrio esquerdo aumentado (4 cm (n=23; estenose mitral (n=46; insuficiência mitral (n=28; dupla lesão mitral (n=16; estenose aórtica (n=12; insuficiência aórtica (n=5; insuficiência tricúspide (n=78; trombose atrial (n=23; calcificação atrial (n=12; hipertensão pulmonar (n=86; fibroelastose biventricular (n=3; rotura atrioventricular (pós-troca de valva mitral (n=1; aneurisma da raiz aórtica (n=1; ventriculectomia parcial (n=8; 88 pacientes saíram do centro cirúrgico em ritmo sinusal e assim permaneceram; 6 precisaram de drogas inotrópicas e 3 de drogas antiarrítmicas. Todos os pacientes que apresentavam átrio esquerdo ou direito gigante com fibrilação atrial tiveram seus átrios reduzidos ao tamanho normal. Não houve mortalidade operatória e 6 evoluíram a óbito hospitalar. Na reavaliação aos seis meses de pós-operatório, os sobreviventes estavam bem, em ritmo sinusal. A técnica do autotransplante cardíaco facilita o reparo intracardíaco, proporciona a redução atrial e conseqüente retorno do paciente ao ritmo sinusal e abre novas perspectivas.From January 1990 to May 1995,92 patients with complex cardiac problems and supraventricular arrhythmias were operated upon with the technique of heart autotransplantation. The arrhythmias were: atrial fibrillation (n=89; reentry (n=2; long QT syndrome (n=1. Females predominated (n=63. The age varied from 18 to 76 years (m=43. Concomittant defects were: giant left atrium (> 6 cm measured by echo (n=65; giant right atrium (n=9; large

  15. Investigation of phenomena brought about by hydrogen using image analysis methods in relationship with microstructure and failure morphology of A508.3 and Z2 CND 22 05 steels and of Fe-Ni alloy

    International Nuclear Information System (INIS)

    Sozanska, Maria

    1997-01-01

    This research thesis report the study, by means of image analysis methods, of phenomena brought about by the hydrogenation of metals. Three materials have been studied: an austeno-ferritic duplex steel (Z2 CND 22 05) which is often used in severe conditions in the oil industry, a bainitic steel (A 508.3) which is used in severe conditions in nuclear plants, and the Fe31pcNi alloy. For the first one, the author characterized the microstructure in relationship with yield strength, and the recovery of mechanical properties with a decrease of hydrogen quantity after thermal treatment and through a detailed examination of the fracture surface. For the second one, the fracture surface has been examined after tensile tests at different temperatures (from -196 to 20 C), and profile parameters obtained with image analysis methods have been correlated with mechanical properties. For the Fe-Ni alloy, image analysis methods have been used to track the variations of the martensitic transformation with or without hydrogen. Martensite morphology has been studied

  16. Development and use of a predictive model of crack propagation in 304/316L, A533B/A508 and Inconel 600/182 alloys in 2880C water

    International Nuclear Information System (INIS)

    Ford, F.P.; Andresen, P.L.

    1988-01-01

    Environmentally assisted cracking (i.e., stress corrosion cracking and corrosion fatigue) continues to present a potential safety and economic problem to both the nuclear and non-nuclear power generation industries. Efforts to develop adequate mitigation actions have been vigorous in the former industry but, of necessity, these have been based primarily on accelerated tests covering a limited fraction of the wide combination of material, environment and stressing conditions that are pertinent to the operation of light water reactors. Previous articles have stressed the potential value of combining these phenomenologically oriented studies of stress corrosion and corrosion fatigue with a mechanistically based model of environmentally assisted cracking. Quite apart from conferring some scientific assurance of the validity of the empirically derived data vis a vis plant performance, the mechanistic knowledge offers the potential of interpreting the isolated experimental data and forming a methodology for making decisions regarding life prediction and life extension. This article briefly reviews the mechanistic basis for predicting the cracking behavior of 304/316 stainless steel, A508/A533B low alloy steels and Inconel 600/182 nickel-base alloys in high temperature water, and then develops the argument for the practical use of this mechanistic knowledge in conjunction with crack monitoring and environmental sensing capabilities

  17. Evaluation of ozonated water using ASTM E1174 for standardized testing of handwash formulations for healthcare personnel.

    Science.gov (United States)

    Nakamura, K; Saito, K; Kashiwazaki, J; Aoyagi, T; Arai, K; Hara, Y; Kobari, S; Mori, H; Ohashi, K; Takano, Y; Kaku, M; Kanemitsu, K

    2018-02-13

    Removal of bacteria by handwashing with ozonated water was evaluated using the ASTM E1174 standard test method. Thirty healthy volunteers were assigned randomly to three groups: ozonated water, antimicrobial soap and water, and non-antimicrobial soap and water. A 3 log 10  cfu reduction was achieved by washing hands with ozonated water or antimicrobial soap and water. However, ozonated water was not significantly superior to non-antimicrobial soap and water. Ozonated water may remove bacteria from the hands to at least a similar extent as that by non-antimicrobial soap and water in the absence of visible dirt or body fluid contamination. Copyright © 2018 The Healthcare Infection Society. Published by Elsevier Ltd. All rights reserved.

  18. COMPETITION BEETWEN DYNAMIC RECUPERATION AND RECRYSTALLIZATION OF ASTM F 138 AUSTENITIC STAINLESS STEEL UTILIZED IN MEDICAL DEVICES

    Directory of Open Access Journals (Sweden)

    Fabio Henrique Casarini Geronimo

    2013-06-01

    Full Text Available ASTM F 138 austenitic stainless steel has being used in the manufacture of orthopedical devices by hot forging. In this work, the flow stress curves are determined by hot torsion tests in a wide range of temperatures and strain rates. With the observed microestrutural evolution by optical microscopy in different hot forming conditions in addiction with EBSD (Electron Backscatter Diffraction techniques it is possible to obtained the recrystallized volume fraction and the misorientation angles of the samples. Due to the intermediate level of stacking fault energy of this material, during the dynamic softening occurs a competition between recrystallization and recovery. The aim of this work is to identify the softening mechanisms in this stainless steel, as well as in which hot work conditions they become more active.

  19. Grazing incidence synchrotron X-ray diffraction and Moessbauer spectroscopy analyses of plasma nitrided ASTM F138 stainless steel

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Danilo Olzon Dionysio de; Ardisson, Jose Domingos, E-mail: dolzon@gmail.com [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Silva, Edilaine Honorio [Studiecentrum voor Kernenergie (Belgium); Olzon-Dionysio, Maristela; Souza, Sylvio Dionysio de; Fabris, Jose Domingos [Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Diamantina, MG (Brazil); Martinez, L.G. [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2016-07-01

    Full text: systematic investigation of samples of plasma-nitriding austenitic stainless steels ASTM F138 and AISI 316L is reported. The surface treatment of the steels through plasma-nitriding was used to improve further the hardness, wear and corrosion resistance of these stainless steels. The resulting layered crystallographic structure actually corresponds to several phases with close cell parameters, making their identification and quantification a real experimental challenge. The ASTM F138 and AISI 316L stainless steel disks were plasma nitrided for 4 h at 400 deg C in a 80% H{sub 2} -20% N2 atmosphere at 6 torr, using plasma current frequencies between 6 and 100 kHz. Data of Moessbauer (CEMS and CXMS) and grazing incidence synchrotron X-ray diffraction (XRD-SR) were systematically collected. The nitrided layer thickness were not in general influenced by the plasma frequency, except at 12 kHz, which produced a layer thickness of approximately 8.0 mm, being in average 40% thicker than for the other samples. CXMS and CEMS Moessbauer spectra for this 12 kHz-sample show a much more pronounced magnetic resonance lines than for the other samples. The Fe{sub 4}N phase presents a single magnetic hyperfine interaction; the other two (Fe{sub 2-3}N and the expanded austenite) present both paramagnetic and magnetic components, even though their hyperfine parameters may not be safely separated. We also present the results of XRD-SR that were probed at several depths. The data from these techniques may be consistently correlated and this leads to an improved model to explain the structure of the nitrided layers. (author)

  20. Síndrome de bajo gasto cardíaco en la tetralogía de Fallot

    Directory of Open Access Journals (Sweden)

    Lincoln de la Parte Pérez

    2002-06-01

    Full Text Available Se realiza un estudio retrospectivo de 200 niños operados de tetralogía de Fallot en el Cardiocentro del Hospital Pediátrico Universitario "William Soler" durante el período comprendido entre los años 1990 y 1993. Se observó una relación directamente proporcional entre el tiempo de pinzamiento aórtico (paro anóxico, el tiempo de circulación extracorpórea (CEC y el desarrollo del síndrome de bajo gasto cardíaco. La incidencia de bajo gasto cardíaco en los niños con tiempo de pinzamiento aórtico menor a los 30 min fue nula, en los pacientes con tiempo menor a los 60 min la incidencia fue del 23,2 % (40 pacientes. En los 24 pacientes que sufrieron procedimientos quirúrgicos prolongados y tiempo de pinzamiento aórtico mayor de 1 hora la incidencia fue del 95,8 %. En los pacientes con tiempo de CEC menor de 90 min la incidencia de bajo gasto cardíaco que de sólo el 9,75 %, en los niños con tiempo de CEC entre 91 y 105 min fue de 15,53 %, en los que necesitaron entre 106 y 120 min de CEC fue del 62,5 % y en los procedimientos quirúrgicos prolongados fue del 95,8 %. La mayoría de los pacientes respondió bien al tratamiento, aunque en un pequeño número de ellos se mantuvo la disfunción ventricular a pesar del tratamiento. Siete niños fallecieron en el posoperatorio para una mortalidad del 3,5 %.A retrospective study of 200 children with Tetralogy of Fallot, who were operated on the Cardiology Center of "William Soler" University Pediatric Hospital from 1990 to 1993, was performed. There was a direct proportional relation between time of holding aorta with forceps (anoxic arrest, time of extracorporeal circulation and the development of low cardiac output syndrome. The incidence of low cardiac output in children who underwent holding of aorta with forceps for less than 30 minutes was zero, but the same procedure applied in patients for less than 60 minutes, the incidence was 23,2%(40 patients. The 24 patients that underwent

  1. Sildenafil vs. Nitroprussiato de Sódio durante Teste de Reatividade Pulmonar pré-transplante cardíaco

    Directory of Open Access Journals (Sweden)

    Aguinaldo Figueiredo Freitas Jr

    2012-09-01

    Full Text Available FUNDAMENTO: A hipertensão pulmonar é associada ao pior prognóstico no pós-transplante cardíaco. O teste de reatividade pulmonar com Nitroprussiato de Sódio (NPS está associado a elevados índices de hipotensão arterial sistêmica, disfunção ventricular do enxerto transplantado e elevadas taxas de desqualificação para o transplante. OBJETIVO: Neste estudo, objetivou-se comparar os efeitos do Sildenafil (SIL e NPS sobre variáveis hemodinâmicas, neuro-hormonais e ecocardiográficas durante teste de reatividade pulmonar. MÉTODOS: Os pacientes foram submetidos, simultaneamente, ao cateterismo cardíaco direito, ao ecocardiograma e à dosagem de BNP e gasometria venosa, antes e após administração de NPS (1 - 2 µg/Kg/min ou SIL (100 mg, dose única. RESULTADOS: Ambos reduziram a hipertensão pulmonar, porém o nitrato promoveu hipotensão sistêmica significativa (Pressão Arterial Média - PAM: 85,2 vs. 69,8 mmHg, p < 0,001. Ambos reduziram as dimensões cardíacas e melhoraram a função cardíaca esquerda (NPS: 23,5 vs. 24,8 %, p = 0,02; SIL: 23,8 vs. 26 %, p < 0,001 e direita (SIL: 6,57 ± 2,08 vs. 8,11 ± 1,81 cm/s, p = 0,002; NPS: 6,64 ± 1,51 vs. 7,72 ± 1,44 cm/s, p = 0,003, medidas pela fração de ejeção ventricular esquerda e Doppler tecidual, respectivamente. O SIL, ao contrário do NPS, apresentou melhora no índice de saturação venosa de oxigênio, medido pela gasometria venosa. CONCLUSÃO: Sildenafil e NPS são vasodilatadores que reduzem, de forma significativa, a hipertensão pulmonar e a geometria cardíaca, além de melhorar a função biventricular. O NPS, ao contrário do SIL, esteve associado a hipotensão arterial sistêmica e piora da saturação venosa de oxigênio.

  2. Primary cardiac lymphoma in dogLinfoma cardíaco primário em cão

    Directory of Open Access Journals (Sweden)

    Mirela Tinucci Costa

    2013-10-01

    Full Text Available Lymphomas are malignant neoplasm characterized by proliferation of lymphocytes that originate primarily in lymphoid organ such as lymph nodes, liver, spleen and bone marrow. However the feature of continuous migration of lymphocytes in different organs, this tumor can develop in any organ. Although lymphoma is a very common hematopoietic neoplasm in dogs, cardiac location is rare. The diagnosis of primary cardiac lymphoma may be performed when there is involvement of the heart and / or the pericardium without evidence of involvement in other organs. In veterinary medicine there are few reports on the diagnosis, treatment and prognosis of cardiac lymphoma. Therefore, the purpose of this report is to describe a case of cardiac lymphoma in which the patient responded favorably to chemotherapy employee with disease-free interval of 19 months and highlight the importance of including this neoplasm in the differential diagnosis of diseases that affect the cardiovascular system. Os linfomas são neoplasias caracterizadas pela proliferação maligna de linfócitos, que originamse principalmente em órgão linfóides como linfonodos, fígado, baço e medula óssea. Entretanto pela característica de contínua migração dos linfócitos por diferentes órgãos, esta neoplasia pode se desenvolver em qualquer órgão. Embora o linfoma seja a neoplasia hematopoiética de maior incidência em cães, a localização cardíaca é rara. O diagnóstico de linfoma cardíaco primário pode ser realizado quando há envolvimento do coração e/ou pericárdio sem evidências de ocorrência de órgãos linfáticos ou extranodais. Em medicina veterinária existem poucos relatos sobre o diagnóstico, tratamento e prognóstico desta neoplasia cardíaca. Portanto o objetivo do presente relato é descrever um caso de linfoma cardíaco em que o paciente respondeu favoravelmente ao tratamento quimioterápico empregado com intervalo livre de doença de 19 meses e salientar a

  3. A cena constituinte da psicose maníaco-depressiva no Brasil The emergence of manic depressive psychosis as a diagnosis in Brazil

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    Joel Birman

    2010-12-01

    Full Text Available A intenção deste ensaio é esboçar a leitura da psicose maníaco-depressiva no Brasil, no começo do século XX. Destaca a transformação teórica ocorrida na psiquiatria brasileira, que se deslocou da tradição francesa para a alemã. Sublinha o modo como a problemática da histeria foi substituída pela da psicose maníaco-depressiva nesse contexto histórico.This essay examines the early twentieth-century interpretation of manic depressive psychosis in Brazil, during a moment when Brazilian psychiatry witnessed a theoretical shift from the French to German traditions. It calls special attention to how the problem of hysteria was replaced by manic depressive psychosis within this historical context.

  4. Registro Español de Trasplante Cardíaco. XX Informe oficial de la sección de insuficiencia Cardíaca y Trasplante Cardíaco de la sociedad Española de Cardiología (1984-2008

    Directory of Open Access Journals (Sweden)

    Luis Almenar Bonet

    2009-07-01

    Conclusiones: La supervivencia obtenida en España con el TC, sobre todo en los últimos años, sitúa al trasplante cardíaco como el tratamiento de elección para cardiopatías irreversibles en situación funcional avanzada y sin otras opciones médicas o quirúrgicas establecidas.

  5. Acute Care of At-Risk Newborns (ACoRN: quantitative and qualitative educational evaluation of the program in a region of China

    Directory of Open Access Journals (Sweden)

    Singhal Nalini

    2012-06-01

    Full Text Available Abstract Background The Acute Care of at-Risk Newborns (ACoRN program was developed in Canada for trained health care providers for the identification and management of newborns who are at-risk and/or become unwell in the first few hours or days after birth. The ACoRN process follows an 8-step framework that enables the evaluation and management of babies irrespective of the experience or expertise of the caregiving individual or team. This study assesses the applicability of the program to Chinese pediatric practitioners. Methods Course content and educational materials were translated from English into Chinese by bilingual neonatal practitioners. Confidence and knowledge questionnaires were developed and reviewed for face and content validity by a team of ACoRN instructors. Bilingual Chinese instructors were trained at the tertiary perinatal centre in Hangzhou Zhejiang to deliver the course at 15 level II county hospitals. Participants completed pre- and post-course confidence and knowledge questionnaires and provided feedback through post-course focus groups. Results 216 physicians and nurses were trained. Confidence and knowledge relating to neonatal stabilization improved significantly following the courses. Participants rated course utility and function between 4.2 and 4.6/5 on all items. Pre/post measures of confidence were significantly correlated with post course knowledge. Focus group data supported the perceived value of the program and recommended course adjustments to include pre-course reading, and increased content related to simulation, communication skills, and management of respiratory illness and jaundice. Conclusions ACoRN, a Canadian educational program, appears to be well received by Chinese health care providers and results in improved knowledge and confidence. International program adaptation for use by health care professionals requires structured and systematic evaluation to ensure that the program meets the needs of

  6. Current situation of asthma-COPD overlap syndrome (ACOS) in Chinese patients older than 40 years with airflow limitation: rationale and design for a multicenter, cross-sectional trial (study protocol).

    Science.gov (United States)

    Kang, Jian; Yao, Wanzhen; Cai, Baiqiang; Chen, Ping; Ling, Xia; Shang, Hongyan

    2016-12-01

    Asthma and chronic obstructive pulmonary disease (COPD) are the frequently occurring chronic airway diseases, and the overlapping syndrome observed in the majority of patients has been recently defined as asthma-COPD overlap syndrome (ACOS) by the Global Initiative for Chronic Obstructive Lung (GOLD, 2014) and Global initiative for Asthma (GINA, 2015). The proportion, features, and clinical practice of ACOS still remain elusive in China. We are conducting this multicenter, cross-sectional, observational study (NCT02600221) to investigate the distributions of chronic obstructive diseases in patients >40 years of age with chronic airflow limitation in China along with determination of the main clinical practice and features of these diseases. The study will also explore the factors that may influence the exacerbations and severity of ACOS in Chinese patients (>40 years of age). A total of 2,000 patients (age, ≥40 years; either sex) who are clinically diagnosed as having asthma, COPD/chronic bronchitis/emphysema, or ACOS for at least 12 months with airflow limitation [post-bronchodilator forced expiratory volume in 1 second/forced vital capacity (FEV 1 /FVC): current situation, main clinical practice, and features of ACOS, asthma, and COPD conditions in Chinese patients. The insights will be helpful in designing optimal management strategies for ACOS and redefining the healthcare development programs.

  7. Empirical ranking of a wide range of WC-Co grades in terms of their abrasion resistance measured by the ASTM standard B 611-85 test

    CSIR Research Space (South Africa)

    O'Quigley, DGF

    1997-01-01

    Full Text Available This paper reports the results of a comprehensive investigation into the abrasion resistance of WC-Co alloys, as measured by the ASTM Standard B 611-85 test. The alloys ranged from 3 to 50 wt% and from 0.6 to 5 mu-m average grain size. Careful...

  8. Effect of increased fuel temperature on emissions of oxides of nitrogen from a gas turbine combustor burning ASTM jet-A fuel

    Science.gov (United States)

    Marchionna, N. R.

    1974-01-01

    An annular gas turbine combustor was tested with heated ASTM Jet-A fuel to determine the effect of increased fuel temperature on the formation of oxides of nitrogen. Fuel temperature ranged from ambient to 700 K. The NOx emission index increased at a rate of 6 percent per 100 K increase in fuel temperature.

  9. Spontaneous ignition in afterburner segment tests at an inlet temperature of 1240 K and a pressure of 1 atmosphere with ASTM jet-A fuel

    Science.gov (United States)

    Schultz, D. F.; Branstetter, J. R.

    1973-01-01

    A brief testing program was undertaken to determine if spontaneous ignition and stable combustion could be obtained in a jet engine afterburning operating with an inlet temperature of 1240 K and a pressure of 1 atmosphere with ASTM Jet-A fuel. Spontaneous ignition with 100-percent combustion efficiency and stable burning was obtained using water-cooled fuel spraybars as flameholders.

  10. An Experimental Copyright Moratorium: Study of a Proposed Solution to the Copyright Photocopying Problem. Final Report to the American Society for Testing and Materials (ASTM).

    Science.gov (United States)

    Heilprin, Laurence B.

    The Committee to Investigate Copyright Problems (CICP), a non-profit organization dedicated to resolving the conflict known as the "copyright photocopying problem" was joined by the American Society for Testing and Materials (ASTM), a large national publisher of technical and scientific standards, in a plan to simulate a long-proposed…

  11. Standard practice for application of thermoluminescence-dosimetry (TLD) systems for determining absorbed dose in radiation-hardness testing of electronic devices. ASTM standard

    International Nuclear Information System (INIS)

    1998-05-01

    This practice is under the jurisdiction of ASTM Committee E-10 on Nuclear Technology and Applications and is the direct responsibility of Subcommittee E10.07 on Radiation Dosimetry for Radiation Effects on Materials and Devices. Current edition approved Jun. 10, 1997. Published May 1998. Originally published as E 668-78. Last previous edition E 668-93

  12. Omalizumab (anti-IgE) therapy in the asthma-COPD overlap syndrome (ACOS) and its effects on circulating cytokine levels.

    Science.gov (United States)

    Yalcin, Arzu Didem; Celik, Betul; Yalcin, Ata Nevzat

    2016-06-01

    The term "asthma-chronic obstructive pulmonary disease (COPD) overlap syndrome" (ACOS) has been applied to the condition, in which a person has clinical features of both asthma and COPD. The patients (N = 10) were presented to our clinic with low lung function, limited reversibility of airway obstruction, hyperinflation, abnormal body composition, dyspnea and episodic wheezing. Based on the clinical and laboratory findings, the patients were diagnosed with ACOS. Patients' serum IL-2 (sIL-2), sIL-4 sIL-6, sIL-10, sIL-17, sTNF-α and sIFN-γ levels were investigated as an apoptotic marker and a marker for inflammation. Having undergone omalizumab treatment and a long-term (12 months) later, patients had a decreased IgE, fractional exhaled nitric oxide concentrations (FENO), eosinophil, neutrophils, macrophages, eosinophil cationic peptide (ECP) and sIL-4 levels. To our knowledge, this is the first documentation of omalizumab use in ACOS. We demonstrated decreased IL-4, allergic pulmonary symptoms (dyspnea, wheezing, bronchial hyper responsiveness) and migraine attacks in the patients.

  13. Caso clínico del Departamento de Psiquiatría: Trastorno afectivo bipolar 1, episodio maníaco

    Directory of Open Access Journals (Sweden)

    José Manuel Calvo Gómez

    1995-04-01

    Full Text Available Se trata de un paciente de 21 años con un cuadro clínico de una semana de evolución cuyas características satisfacen los criterios diagnósticos de la Cuarta Edición del Manual Estadístico y Diagnóstico de los Trastornos Mentales (DSM IV para trastorno afectivo bipolar 1,episodio maníaco severo con características psicóticas congruentes con el estado de ánimo. Criterios diagnósticos para trastorno afectivo bipolar 1: A. Actualmente (o recientemente en episodio maníaco. B. Ha existido previamente al menos un episodio depresivo mayor, episodio maníaco o episodio mixto. C. Los episodios afectivos de los criterios A y B no son producidos por un trastorno esquizoafectivo y no están superpuestos sobre esquizofrenia, trastorno esquizofreniforme, trastorno delirante, o trastorno psicótico no especificado en otro sitio.

  14. Welding by submerged arc of steel with addition of iron powder; Soldagem por arco submerso de aco microligado com adicao de po de ferro

    Energy Technology Data Exchange (ETDEWEB)

    Gomes, Samuel I.N.; Spinelli, Dirceu [Sao Paulo Univ., Sao Carlos, SP (Brazil). Escola de Engenharia; Souza, Paulo C.R. D. de [SICOM Compressores Ltda., Sao Carlos, SP (Brazil); Magalhaes Bento Goncalves, Gilberto de [Bauru Univ., SP (Brazil)

    1993-12-31

    Welding metals with and without iron powder addition were produced in steel plates ASTM A 242 by submerged arc process. as a conclusion, the mechanical properties of hardness and toughness of weld metal and heat affect zone were more affected when the welding were done with lower heat input. (author). 16 refs., 3 figs., 9 tabs.

  15. DESIGN AND OPTIMIZATION OF PERMANENT MAGNET SYNCHRONOUS GENERATOR FOR USE IN HYDRODYNAMIC RENEWABLE ENERGY BY APPLYING ACO AND FEA

    Directory of Open Access Journals (Sweden)

    Amir Nikbakhsh

    2017-12-01

    Full Text Available One of the most important ways to reduce fossil fuel consumption and consequently reduce greenhouse gases and environmental pollution is the use of renewable energies such as water, sun, wind, etc. One of the most efficient ways to take advantages of the shallow flowing waters such as rivers and fountains in electrical power generation is the use of hydrodynamic screw in the direction of water flow. The design of the generator for this application results in environmental dangers decrease. On the other hand, it provides some part of electrical energy required for human beings. Generators in hydrodynamic renewable energy system ought to have features such as high efficiency, power density and reliability as well as low volume. Among various generators, the permanent magnet synchronous generator (PMSG meets these requirements very well. In this paper, first, analytical calculations and the design process of PMSG were explained. Then, the ant colony optimization (ACO was used for the optimization of design quantities. PMSG design optimization increased in efficiency and decreased in volume. By improving these two parameters in the designed PMSG, it gets very suitable to be used in hydrodynamic renewable energy system. Finally, the results of the optimized design of PMSG were validated through simulation of it in Maxwell software and applying finite element analysis (FEA. Also the final results have been compared to similar experimental researches results.

  16. Optimizing VM allocation and data placement for data-intensive applications in cloud using ACO metaheuristic algorithm

    Directory of Open Access Journals (Sweden)

    T.P. Shabeera

    2017-04-01

    Full Text Available Nowadays data-intensive applications for processing big data are being hosted in the cloud. Since the cloud environment provides virtualized resources for computation, and data-intensive applications require communication between the computing nodes, the placement of Virtual Machines (VMs and location of data affect the overall computation time. Majority of the research work reported in the current literature consider the selection of physical nodes for placing data and VMs as independent problems. This paper proposes an approach which considers VM placement and data placement hand in hand. The primary objective is to reduce cross network traffic and bandwidth usage, by placing required number of VMs and data in Physical Machines (PMs which are physically closer. The VM and data placement problem (referred as MinDistVMDataPlacement problem is defined in this paper and has been proved to be NP- Hard. This paper presents and evaluates a metaheuristic algorithm based on Ant Colony Optimization (ACO, which selects a set of adjacent PMs for placing data and VMs. Data is distributed in the physical storage devices of the selected PMs. According to the processing capacity of each PM, a set of VMs are placed on these PMs to process data stored in them. We use simulation to evaluate our algorithm. The results show that the proposed algorithm selects PMs in close proximity and the jobs executed in the VMs allocated by the proposed scheme outperforms other allocation schemes.

  17. Oxigenación de membrana extracorpórea para soporte cardíaco o respiratorio en adultos

    Directory of Open Access Journals (Sweden)

    Salvador Torregrosa

    2009-04-01

    Full Text Available La oxigenación de membrana extracorpórea (ECMO es un sistema de asistencia mecánica circulatoria y respiratoria extracorpórea de corta duración. Está indicado en el shock cardiogénico e insuficiencia respiratoria con compromiso vital de cualquier causa, cuando las medidas terapéuticas médicas o quirúrgicas convencionales, incluyendo el empleo del balón intraaórtico de contrapulsación, han fracasado. Sus ventajas respecto a otros sistemas de asistencia mecánica circulatoria son: 1 inicio rápido de la asistencia mediante canulación periférica; 2 es una técnica poco agresiva, por lo que es mejor tolerada en estos pacientes críticos; 3 al no necesitar toracotomía, permite continuar con las medidas de resucitación cardiopulmonar en los pacientes con parada cardíaca; 4 proporciona soporte pulmonar, univentricular o biventricular; 5 se ha mostrado eficaz como puente a una asistencia ventricular de larga duración o como puente a trasplante cardíaco, y 6 es mucho más económico que otros dispositivos de asistencia ventricular.

  18. Multi-objective ACO algorithms to minimise the makespan and the total rejection cost on BPMs with arbitrary job weights

    Science.gov (United States)

    Jia, Zhao-hong; Pei, Ming-li; Leung, Joseph Y.-T.

    2017-12-01

    In this paper, we investigate the batch-scheduling problem with rejection on parallel machines with non-identical job sizes and arbitrary job-rejected weights. If a job is rejected, the corresponding penalty has to be paid. Our objective is to minimise the makespan of the processed jobs and the total rejection cost of the rejected jobs. Based on the selected multi-objective optimisation approaches, two problems, P1 and P2, are considered. In P1, the two objectives are linearly combined into one single objective. In P2, the two objectives are simultaneously minimised and the Pareto non-dominated solution set is to be found. Based on the ant colony optimisation (ACO), two algorithms, called LACO and PACO, are proposed to address the two problems, respectively. Two different objective-oriented pheromone matrices and heuristic information are designed. Additionally, a local optimisation algorithm is adopted to improve the solution quality. Finally, simulated experiments are conducted, and the comparative results verify the effectiveness and efficiency of the proposed algorithms, especially on large-scale instances.

  19. Qualidade de vida de pacientes submetidos ao transplante cardíaco: aplicação da escala Whoqol-Bref

    Directory of Open Access Journals (Sweden)

    Maria Isis Freire de Aguiar

    2011-01-01

    Full Text Available FUNDAMENTO: O sucesso do transplante cardíaco significa garantir a sobrevida dos pacientes com cardiopatia e permitir-lhes desenvolver suas atividades diárias. O transplante cardíaco apresenta-se como a primeira opção de tratamento na falência cardíaca, representando um aumento de sobrevida e qualidade de vida dos transplantados. OBJETIVO: Avaliar a qualidade de vida de pacientes submetidos ao transplante cardíaco através da aplicação de uma escala padronizada (Whoqol-Bref. MÉTODOS: Estudo exploratório descritivo de abordagem quantitativa, realizado com 55 pacientes submetidos ao transplante cardíaco, em um período entre o terceiro e o 103º mês, que realizam acompanhamento na Unidade de Transplante e Insuficiência Cardíaca em um Hospital de Referência em Cardiologia na cidade de Fortaleza, CE. Os dados foram coletados no período de fevereiro a abril de 2009, por meio da aplicação de um questionário padronizado pela Organização Mundial da Saúde e utilização de dados constantes nos prontuários. RESULTADOS: Com relação ao domínio físico, 62,8% e 58,3% dos pacientes, dos sexos masculino e feminino, respectivamente, estão satisfeitos. No domínio psicológico, dentre pacientes do sexo masculino, 65,1% apresentam satisfação quanto à qualidade de vida e, no sexo feminino, 58,3% encontram-se satisfeitas. No domínio das relações sociais, observou-se que, no sexo masculino, 53,5% estão muito satisfeitos, e apresentou-se um nível de satisfação de 100% no sexo feminino. No domínio do meio ambiente, 65,1% do sexo masculino encontram-se satisfeitos, e no sexo feminino, 83,3% estão satisfeitas. CONCLUSÃO: O transplante cardíaco teve bastante influência na qualidade de vida dos pacientes transplantados, pois os resultados mostram-se estatisticamente significantes no pós-transplante.

  20. Studies on the welding of heavy-section ASTM A542 Cl. 1 steel for large-sized pressure vessels

    International Nuclear Information System (INIS)

    Shimizu, Shigeki; Aota, Toshiichi; Kasahara, Masayuki

    1977-01-01

    ASTM A 542, Cl. 1 steel was developed and standardized recently, and is excellent in the high temperature strength and toughness as compared with conventionally used A 387, Grade 22 steel, accordingly the application to large pressure vessels is planned. This steel is a low alloy steel, and in case of large thickness, the possibility of cracking in the welded part is large. Also many times of annealing are required for the prevention of welding cracking, the relieving of residual stress, and the softening of hardened portion, but the possibility of cracking during stress-relieving annealing is large. In this study, Tekken type cracking test was carried out by coated electrode welding, and restricted cracking test was carried out by submerged arc welding of the A 542, Cl. 1 steel and A 387, Grade 22 steel, thus the welding cracking property was investigated, and the optimal welding conditions were selected. Also the test of cracking during the stress-relieving annealing of both steels was carried out, and the method of preventing the cracking was studied. The optimal conditions of stress-relieving annealing were selected, and the mechanism of the cracking was clarified. The mechanical properties of the joints welded and stress-relieved under the selected conditions were confirmed. (Kako, I.)

  1. Sensitization Behavior of Type 409 Ferritic Stainless Steel: Confronting DL-EPR Test and Practice W of ASTM A763

    Science.gov (United States)

    Scalise, Taís Campos; de Oliveira, Mara Cristina Lopes; Sayeg, Isaac Jamil; Antunes, Renato Altobelli

    2014-06-01

    Stainless steels employed for manufacturing automotive exhaust systems must withstand severe thermal cycles, corrosive environment due to urea decomposition, and welding operations. AISI 409 ferritic stainless steel can be considered a low-cost alternative for this application. However, depending on the manufacturing conditions during welding cycles, this material can be sensitized due to the precipitation of chromium carbides at grain boundaries. In this work, the intergranular corrosion resistances of the AISI 409 ferritic stainless steel were evaluated after annealing at 300, 500, and 700 °C for 2, 4, and 6 h. Solution-annealed samples were also tested for comparison purposes. Two methodologies were used to assess the sensitization behavior of the 409 stainless steel samples: the first one was based on the ASTM A763 (practice W), while the second one was based on the double-loop electrochemical potentiodynamic reactivation test. It was possible to identify that the annealing treatment performed at 500 °C was more critical to the occurrence of intergranular corrosion.

  2. Effects of thermal treatments on protein adsorption of Co-Cr-Mo ASTM-F75 alloys.

    Science.gov (United States)

    Duncan, L A; Labeed, F H; Abel, M-L; Kamali, A; Watts, J F

    2011-06-01

    Post-manufacturing thermal treatments are commonly employed in the production of hip replacements to reduce shrinkage voids which can occur in cast components. Several studies have investigated the consequences of these treatments upon the alloy microstructure and tribological properties but none have determined if there are any biological ramifications. In this study the adsorption of proteins from foetal bovine serum (FBS) on three Co-Cr-Mo ASTM-F75 alloy samples with different metallurgical histories, has been studied as a function of protein concentration. Adsorption isotherms have been plotted using the surface concentration of nitrogen as a diagnostic of protein uptake as measured by X-ray photoelectron spectroscopy. The data was a good fit to the Langmuir adsorption isotherm up to the concentration at which critical protein saturation occurred. Differences in protein adsorption on each alloy have been observed. This suggests that development of the tissue/implant interface, although similar, may differ between as-cast (AC) and heat treated samples.

  3. Influence of Chromium-Cobalt-Molybdenum Alloy (ASTM F75) on Bone Ingrowth in an Experimental Animal Model.

    Science.gov (United States)

    Zuchuat, Jésica; Berli, Marcelo; Maldonado, Ysaí; Decco, Oscar

    2017-12-26

    Cr-Co-Mo (ASTM F75) alloy has been used in the medical environment, but its use as a rigid barrier membrane for supporting bone augmentation therapies has not been extensively investigated. In the present study, Cr-Co-Mo membranes of different heights were placed in New Zealand white, male rabbit tibiae to assess the quality and volume of new bone formation, without the use of additional factors. Animals were euthanized at 20, 30, 40, and 60 days. Bone formation was observed in all of the cases, although the tibiae implanted with the standard membranes reached an augmentation of bone volume that agreed with the density values over the timecourse. In all cases, plasmatic exudate was found under the membrane and in contact with the new bone. Histological analysis indicated the presence of a large number of chondroblasts adjacent to the inner membrane surface in the first stages, and osteoblasts and osteocytes were observed under them. The bone formation was appositional. The Cr-Co-Mo alloy provides a scaffold with an adequate microenvironment for vertical bone volume augmentation, and the physical dimensions and disposition of the membrane itself influence the new bone formation.

  4. The effect of water injection on nitric oxide emissions of a gas turbine combustor burning ASTM Jet-A fuel

    Science.gov (United States)

    Marchionna, N. R.; Diehl, L. A.; Trout, A. M.

    1973-01-01

    Tests were conducted to determine the effect of water injection on oxides of nitrogen (NOx) emissions of a full annular, ram induction gas turbine combustor burning ASTM Jet-A fuel. The combustor was operated at conditions simulating sea-level takeoff and cruise conditions. Water at ambient temperature was injected into the combustor primary zone at water-fuel ratios up to 2. At an inlet-air temperature of 589 K (600 F) water injection decreased the NOx emission index at a constant exponential rate: NOx = NOx (o) e to the -15 W/F power (where W/F is the water-fuel ratio and NOx(o) indicates the value with no injection). The effect of increasing combustor inlet-air temperature was to decrease the effect of the water injection. Other operating variables such as pressure and reference Mach number did not appear to significantly affect the percent reduction in NOx. Smoke emissions were found to decrease with increasing water injection.

  5. High-cycle notch sensitivity of alloy steel ASTM A743 CA6NM used in hydrogenator turbine components

    Directory of Open Access Journals (Sweden)

    José Alexander Araújo

    2010-10-01

    Full Text Available The presence of notches and other stress concentrations in turbine blades and other notch hydraulic components is a current problem in engineering. It causes a reduction of endurance limit of material. In that sense, specimens of the ASTM A743 CA6NM alloy steel using in several hydrogenator turbine components was tested. The specimens were tested under uniaxial fatigue loading with a load ratio equal to -1, and the considered stress concentration factors, Kt, values, calculated with respect to net area, were 1.55, 2.04 and 2.42. In order to determine the fatigue limit for such notch type, a reduction data method by Dixon and Mood, Staircase method was used. This approach is based on the assumed target distribution of the fatigue limit. For such geometry at least 8 specimens were tested. In addition, the Peterson and Neuber’s notch fatigue factor were compared through fatigue notch reduction factor, Kf, obtained from experimental data. According to results obtained it was possible to conclude that the tested material is less sensitive to notches than the prediction of the Peterson and Neuber’s empirical models.

  6. Influence of Chromium-Cobalt-Molybdenum Alloy (ASTM F75 on Bone Ingrowth in an Experimental Animal Model

    Directory of Open Access Journals (Sweden)

    Jésica Zuchuat

    2017-12-01

    Full Text Available Cr-Co-Mo (ASTM F75 alloy has been used in the medical environment, but its use as a rigid barrier membrane for supporting bone augmentation therapies has not been extensively investigated. In the present study, Cr-Co-Mo membranes of different heights were placed in New Zealand white, male rabbit tibiae to assess the quality and volume of new bone formation, without the use of additional factors. Animals were euthanized at 20, 30, 40, and 60 days. Bone formation was observed in all of the cases, although the tibiae implanted with the standard membranes reached an augmentation of bone volume that agreed with the density values over the timecourse. In all cases, plasmatic exudate was found under the membrane and in contact with the new bone. Histological analysis indicated the presence of a large number of chondroblasts adjacent to the inner membrane surface in the first stages, and osteoblasts and osteocytes were observed under them. The bone formation was appositional. The Cr-Co-Mo alloy provides a scaffold with an adequate microenvironment for vertical bone volume augmentation, and the physical dimensions and disposition of the membrane itself influence the new bone formation.

  7. Transplante cardíaco no Instituto Dante Pazzanese de Cardiologia: análise da sobrevida

    Directory of Open Access Journals (Sweden)

    ASSEF Marco Aurélio Salles

    2001-01-01

    Full Text Available CASUÍSTICA E MÉTODOS: Foram analisados, retrospectivamente, 80 transplantes cardíacos realizados no Instituto Dante Pazzanese de Cardiologia (IDPC no período de novembro de 1991 a agosto de 2000. Houve predomínio do sexo masculino em 70% dos casos e a idade variou de 7 a 69 anos, com média de 44,8 anos. Doze (15% pacientes se encontravam em prioridade, em uso de drogas inotrópicas endovenosas no momento do transplante. As etiologias determinantes da insuficiência cardíaca congestiva grave foram: miocardiopatia dilatada idiopática em 37,5%, miocardiopatia isquêmica em 33,75%, miocardiopatia chagásica em 17,5% e outras causas em 11,25%. Foram realizados 78 transplantes ortotópicos e 2 heterotópicos. A técnica empregada foi bicaval/bipulmonar em 63,75%, atrial em 27,5%, bicaval/unipulmonar em 6,25% e heterotópico em 2,5%. A mortalidade hospitalar (30 dias foi de 18,75%. RESULTADOS: A sobrevida para o transplante ortotópico em um ano foi de 72,7%, em cinco anos 61,5% e em sete anos 56,4%. A sobrevida após o transplante foi correlacionada com as variáveis idade, causa de óbito e sexo do doador, e pelo transplante ter sido ou não a primeira cirurgia cardíaca do paciente.

  8. Optimization on Paddy Crops in Central Java (with Solver, SVD on Least Square and ACO (Ant Colony Algorithm))

    Science.gov (United States)

    Parhusip, H. A.; Trihandaru, S.; Susanto, B.; Prasetyo, S. Y. J.; Agus, Y. H.; Simanjuntak, B. H.

    2017-03-01

    Several algorithms and objective functions on paddy crops have been studied to get optimal paddy crops in Central Java based on the data given from Surakarta and Boyolali. The algorithms are linear solver, least square and Ant Colony Algorithms (ACO) to develop optimization procedures on paddy crops modelled with Modified GSTAR (Generalized Space-Time Autoregressive) and nonlinear models where the nonlinear models are quadratic and power functions. The studied data contain paddy crops from Surakarta and Boyolali determining the best period of planting in the year 1992-2012 for Surakarta where 3 periods for planting are known and the optimal amount of paddy crops in Boyolali in the year 2008-2013. Having these analyses may guide the local agriculture government to give a decision on rice sustainability in its region. The best period for planting in Surakarta is observed, i.e. the best period is in September-December based on the data 1992-2012 by considering the planting area, the cropping area, and the paddy crops are the most important factors to be taken into account. As a result, we can refer the paddy crops in this best period (about 60.4 thousand tons per year) as the optimal results in 1992-2012 where the used objective function is quadratic. According to the research, the optimal paddy crops in Boyolali about 280 thousand tons per year where the studied factors are the amount of rainfalls, the harvested area and the paddy crops in 2008-2013. In this case, linear and power functions are studied to be the objective functions. Compared to all studied algorithms, the linear solver is still recommended to be an optimization tool for a local agriculture government to predict paddy crops in future.

  9. Effect of using the double layer technique on the microstructure, microhardness and residual stress of welded ASTM A516 GR70 structural steel

    International Nuclear Information System (INIS)

    Oliveira, George Luiz Gomes de; Miranda, Helio Cordeiro de

    2010-01-01

    The aim of this work is to evaluate the effect of using the double layer technique on the microstructure, microhardness and residual stresses of welded ASTM A516 Gr70 structural steel. Samples were welded with the same welding parameters and two types of chamfers, while the samples welded using the double layer technique underwent a buttering process on their chamfer face. Residual stress measurement was accomplished through x-ray diffraction, using a mini diffractometer for measurement in field. Metallographic analysis was accomplished in the transverse section of the welded joint, using optic microscopy and scanning electron microscopy. The double layer technique showed that can be used in the welding of ASTM A516 Gr70 steel, because, besides promote a refinement and a drawing back of the CG-HAZ, it increased compressive residual stress in the whole surface of the analyzed samples.(author)

  10. ASTM lights the way for tissue engineered medical products standards: jump start for combination medical products that restore biological function of human tissues.

    Science.gov (United States)

    Picciolo, G L; Stocum, D L

    2001-01-01

    Everybody hopes for better health and restoration of impaired bodily function, and now that hope is illuminated by the promise of powerful biological tools that make human cells grow and replace human tissue. ASTM Committee F04 on Medical and Surgical Materials and Devices is taking the lead by defining some of those tools as standards that can be used for the development, production, testing, and regulatory approval of medical products.

  11. MÉTODOS PARA CARACTERIZAR COMBUSTIBLES LÍQUIDOS Y GASEOSOS OBTENIDOS DE LLANTAS EN DESUSO A TRAVÉS DE LAS NORMAS ASTM.

    Directory of Open Access Journals (Sweden)

    JAIME ALEJANDRO OSPINA

    2011-12-01

    Full Text Available Este artículo muestra la importancia de la caracterización de la energía de combustibles líquidos y gaseosos obtenidos del conocido tratamiento térmico de pirolisis a través de un microondas. La caracterización de estos combustibles tomará en cuenta los estándares técnicos tales como ASTM D3452 – 93 para la cromatografía de gases (GC, ASTM D2549 para cromatografía de gas/ espectrometría de masa (GC/MS y ASTM D6370 -99 para termogravimetría en el análisis de la composición de llantas.También muestra que estos combustibles y gases de pirolisis tiene una alta valor calorífico de 42 MJ / Kg y un contenido de azufre entre 0.8 y 1.65 Wt%, dependiendo en el tipo de llanta y las condiciones del proceso.

  12. 314. Extracción de dispositivos intracardíacos en pacientes sometidos previamente a procedimientos de cardiología intervencionista

    OpenAIRE

    E. Villagrán; L. Montes; Z. Garcés; A. Ayaon; M. Carnero; J. Silva; A. Alswies; J.E. Rodríguez

    2012-01-01

    Descripción de una cohorte de pacientes sometidos a la implantación de algún dispositivo intracardíaco percutáneo (DCIP) que finalmente fueron intervenidos quirúrgicamente por disfunción de los mismos. Material y métodos: Se analizó de forma retrospectiva toda la cohorte de pacientes sometidos a extracción de DCIP intervenidos en nuestro centro. Se describe la muestra de pacientes y se resumen los resultados quirúrgicos. Resultados: Desde julio de 2007 – julio de 2011, 25 pacientes inte...

  13. Avaliação da doença vascular do enxerto no transplante cardíaco: experiência de um centro brasileiro

    Directory of Open Access Journals (Sweden)

    Elide Sbardellotto Mariano da Costa

    2012-10-01

    Full Text Available FUNDAMENTO: O transplante cardíaco continua sendo o tratamento de escolha para a insuficiência cardíaca refratária ao tratamento otimizado. Dois métodos diagnósticos apresentam elevada sensibilidade no diagnóstico de episódios de rejeição ao enxerto e Doença Vascular do Enxerto (DVE, causas importantes de mortalidade no pós-transplante. OBJETIVO: Avaliar a relação entre os resultados do ultrassom intracoronariano (USIV e os laudos das biópsias endomiocárdicas (BX no seguimento de pacientes submetidos a transplante cardíaco em um serviço de referência brasileiro. MÉTODOS: Foi realizado um ensaio epidemiológico retrospectivo observacional, com pacientes submetidos a transplante cardíaco ortotópico, no período de 2000 a 2009. Foram analisados os prontuários desses pacientes e os resultados dos USIV e BX realizados rotineiramente no seguimento clínico pós-transplante e terapêutica em uso. RESULTADOS: Dos 77 pacientes analisados, 63,63% são do sexo masculino, nas faixas etárias de 22 a 69 anos. Quanto aos resultados dos USIV, 33,96% foram classificados em Stanford classe I, e 32,08%, como Stanford IV. Dos 143 laudos das biópsias, 51,08% tiveram resultado 1R, 3R em 0,69% dos laudos, e 14,48% apresentaram a descrição de efeito Quilty. Todos usaram antiproliferativos, 80,51% usaram inibidores da calcineurina e 19,48% usaram inibidores do sinal de proliferação (ISP. CONCLUSÃO: A avaliação dos pacientes pós-transplante cardíaco por meio do USIV incorpora informações detalhadas para o diagnóstico precoce e sensível da DVE, que são complementadas pelas informações histológicas fornecidas pelas BX, estabelecendo uma possível relação causal entre a DVE e os episódios de rejeição humoral.

  14. Inter-dependence of the electron beam excitations with the free electron laser stability on the super-ACO storage ring

    CERN Document Server

    Couprie, Marie Emmanuelle; Nutarelli, D; Renault, E; Billardon, M

    1999-01-01

    Storage ring free electron lasers have a complex dynamics as compared to the LINAC driven FEL sources since both the laser and the recirculating electron beam behaviours are involved. Electron beam perturbations can strongly affect the FEL operation (start-up, stability) whereas the FEL can stabilize beam instabilities. Experimental analysis together with simulations are reported here. Improvements of the Super-ACO FEL for users is discussed, and consequences are given in terms of electron beam tolerances for a source development for users.

  15. Extracción de un catéter fracturado mediante cateterismo cardíaco intervencionista en un paciente prematuro de 1 600 g

    Directory of Open Access Journals (Sweden)

    Francisco Javier Ozores Suárez

    2011-06-01

    Full Text Available Se documenta el caso de un paciente de 1 mes de edad, prematuro, con peso de 1 600 g, cuyo catéter epicutáneo se fracturó y desplazó hasta ubicarse en la porción distal en la rama izquierda de la arteria pulmonar. El catéter se extrajo por vía femoral mediante un procedimiento de cateterismo cardíaco intervencionista, con lo que se demostró la efectividad de dicho procedimiento ante este tipo de complicación.

  16. Significados dos episódios maníacos para pacientes com transtorno bipolar em remissão: um estudo qualitativo

    Directory of Open Access Journals (Sweden)

    Luiz Carlos Pereira Bin

    2014-07-01

    Full Text Available Objetivo Discutir os significados da vivência de episódios maníacos para pacientes com transtorno bipolar (TAB. Métodos Trata-se de uma pesquisa qualitativa, feita por meio de entrevistas semidirigidas em profundidade, em uma amostra fechada pelo critério de saturação com oito pacientes com TAB em remissão. A técnica de tratamento de dados foi feita por meio da análise de conteúdo das entrevistas transcritas na íntegra e categorização. Os resultados foram submetidos à validação externa, no Laboratório de Pesquisa Clínico-Qualitativa do Departamento de Psicologia Médica e Psiquiatria da Unicamp, composto por 37 pesquisadores do método, entre eles mestrandos, doutorandos, pós-doutorados e pesquisadores seniores. Resultados Foram identificadas três categorias – Ambivalência e vergonha: pensar ou não pensar sobre os episódios maníacos; Organizando sentimentos pessoais: a remissão como um momento de autoconsciência; Episódios maníacos estruturando relações interpessoais versus projeções da angústia. Conclusão Os achados da presente pesquisa contribuem para a maior compreensão dos quadros maníacos no TAB, que podem auxiliar nas reflexões acerca da relação profissional-paciente, para elaborar estratégias para aderência e para as medidas terapêuticas e preventivas da recorrência dos episódios. Podem auxiliar a equipe de saúde envolvida no acompanhamento desses casos e também os pesquisadores na investigação da contribuição dos significados aqui discutidos nos fenômenos de aderência ao tratamento e de um melhor prognóstico.

  17. Ação do resveratrol sobre proteoglicanos de membrana presentes no músculo cardíaco em modelo animal de cardiomiopatia diabética

    OpenAIRE

    Paula Lazara Cruz

    2016-01-01

    Introdução: Ratos com diabetes induzido por estreptozotocina (STZ) apresentam alterações nos proteoglicanos Sindecan-4 e Glipican-1 no tecido cardíaco concomitantes à instalação da disfunção diastólica, evento precoce que culmina na cardiomiopatia diabética. O uso de resveratrol (RSV) em modelos animais foi capaz de melhorar a função cardíaca e o controle autonômico. Espera-se que o tratamento com esse flavonoide atue nos níveis alterados dos proteoglicanos em animais diabéticos. Objetivo: Av...

  18. Overview (this manuscript is an overview of an ASTM symposium. The authors, John Sebroski and Mark Mason, of the overview were the co-chairs of the symposium and co-editors of the manuscripts submitted for ASTM peer review and subsequent publication in the technical proceedings for the symposium)

    Science.gov (United States)

    The Symposium on Developing Consensus Standards for Measuring Chemical Emissions from Spray Polyurethane Foam (SPF) Insulation was held on April 30th and May 1, 2015. Sponsored by ASTM Committee D22 on Air Quality, the symposium was held in Anaheim, CA, in conjunction with the st...

  19. Microstructural evolution of ASTM P91 after 100,000 hours exposure at 550 C and 600 C

    Energy Technology Data Exchange (ETDEWEB)

    Cipolla, L.; Venditti, D.; Di Gianfrancesco, A. [Centro Sviluppo Materiali SpA, Rome (Italy); Caminada, S. [TenarisDalmine, Dalmine (Italy); Danielsen, H.K. [Technical Univ. of Denmark, Lyngby (Denmark)

    2010-07-01

    ASTM A335 P91 samples were investigated after creep testing at 550 C and 600 C for over 10{sup 5} h. X-Ray Diffraction, Scanning and Transmission Electron Microscopy were adopted to assess the microstructural evolution of the material in terms of precipitation changes during high temperature exposure. Mean equivalent diameters and average chemical compositions of MX and M{sub 23}C{sub 6} precipitates and Laves phases were assessed through the analysis of a large number of particles. Their growth and coarsening kinetics were determined at 600 C on many samples with increasing exposure times up to 100,000 hours. Also the presence of modified Z-phase, Cr(V, Nb)N, was investigated. The high microstructural stability of Grade 91 is related to the presence of fine and distributed MX carbonitrides, always present even after very long term temperature exposure. The mean size of MX carbonitrides remains almost constant and stays below 45 nm after 10{sup 5} h at 600 C. Although MX particles exhibit a Cr enrichment with increasing ageing times, indicating that they are absorbing Cr atoms from the surrounding matrix, their transformation into Z-phase is still at a very preliminary stage: only a few hybrid MX/Z particles and a few Z-phase precipitates were identified in the most aged sample after 10{sup 5} at 600 C. Coarsening of M{sub 23}C{sub 6} occurs during thermal exposure, but their average equivalent diameter, initially of 140 nm in the as-treated material, remains below 200 nm after 10{sup 5} h at 600 C. Laves particles form at grain boundaries after a relatively short time and soon become the largest precipitates. (orig.)

  20. Espectro óculo-aurículo-vertebral em pacientes com defeitos cardíacos congênitos

    Directory of Open Access Journals (Sweden)

    Rafael Fabiano Machado Rosa

    2010-10-01

    Full Text Available FUNDAMENTO: Há poucos estudos avaliando a frequência do espectro óculo-aurículo-vertebral (EOAV nos pacientes com defeitos cardíacos congênitos (DCC. OBJETIVO: Verificar a frequência do EOAV em uma amostra de pacientes com malformações cardíacas graves. MÉTODOS: Avaliamos uma coorte prospectiva de pacientes com DCC, admitidos em uma unidade de terapia intensiva (UTI cardiopediátrica no Brasil. O diagnóstico de EOAV foi feito com base em dados clínicos, considerando critérios padrões. Os pacientes que preenchiam esses critérios foram submetidos ao cariótipo de alta resolução com bandamento GTG e hibridização fluorescente in situ para a microdeleção 22q11.2. O teste exato de Fisher (P < 0,05 foi usado para as análises estatísticas. RESULTADOS: Durante o período de avaliação, 330 pacientes foram hospitalizados pela primeira vez na UTI, mas trinta deles não participaram deste estudo. Dos 300 pacientes que constituíram a amostragem final, o EOAV foi verificado em três casos (1%. Todos apresentaram estudos citogenéticos normais. CONCLUSÃO: O EOAV parece ser uma condição frequente em pacientes com DCC. Contudo, não podemos excluir a possibilidade de que a frequência de EOAV encontrada em nosso estudo possa ter sido subestimada devido à baixa taxa de detecção pré-natal de DCC e ao acesso limitado dos pacientes ao tratamento médico apropriado em nosso meio. Estudos prospectivos futuros com critérios clínicos bem definidos e pacientes com defeitos leves e graves serão importantes para avaliar o papel do EOAV na população em geral de indivíduos com malformações cardíacas.

  1. Advance Payment ACO Model

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Advance Payment Model is designed for physician-based and rural providers who have come together voluntarily to give coordinated high quality care to the...

  2. Dynamics and performance of the free electron laser at Super-Aco with a harmonic RF cavity set on 500 MHz

    International Nuclear Information System (INIS)

    Nutarelli, D.

    2000-01-01

    This work is dedicated to the development of the potentialities of the free electron laser that has been installed on the storage ring Super-Aco at Orsay university. We have studied the dynamics of the electron beam inside a harmonic RF cavity set on 500 MHz. The impact of the geometric characteristics of the optical cavity on the transverse overlapping between laser radiation and the electron beam has been studied in details. An important part of the work has been the assessment of the optical characterization of the dielectric multi-layer mirrors of the cavity. For that purpose a complete system has been designed to assess the changes in optical properties of mirrors during laser operation. Another important part of this work was the study of the interaction process between laser radiation and the electron bunch leading to saturation. This interaction process has been simulated through a new model and some predictions given by this model have been successfully confronted to experimental data. The installation of the harmonic RF cavity has led to a significant increase of the laser radiation gain and the value of the mean power of the laser radiation has reached 300 mW. An interesting application of this technique is the generation of high energy gamma photons through Compton backscattering. A collimated 35 MeV-energy photon beam has been produced at Super-Aco with a rate of 5.10 6 photons per second. (A.C.)

  3. Consistent Evaluation of ACOS-GOSAT, BESD-SCIAMACHY, CarbonTracker, and MACC Through Comparisons to TCCON

    Science.gov (United States)

    Kulawik, Susan; Wunch, Debra; O’Dell, Christopher; Frankenberg, Christian; Reuter, Maximilian; Chevallier, Frederic; Oda, Tomohiro; Sherlock, Vanessa; Buchwitz, Michael; Osterman, Greg; hide

    2016-01-01

    Consistent validation of satellite CO2 estimates is a prerequisite for using multiple satellite CO2 measurements for joint flux inversion, and for establishing an accurate long-term atmospheric CO2 data record. Harmonizing satellite CO2 measurements is particularly important since the differences in instruments, observing geometries, sampling strategies, etc. imbue different measurement characteristics in the various satellite CO2 data products. We focus on validating model and satellite observation attributes that impact flux estimates and CO2 assimilation, including accurate error estimates, correlated and random errors, overall biases, biases by season and latitude, the impact of coincidence criteria, validation of seasonal cycle phase and amplitude, yearly growth, and daily variability. We evaluate dry-air mole fraction (X(sub CO2)) for Greenhouse gases Observing SATellite (GOSAT) (Atmospheric CO2 Observations from Space, ACOS b3.5) and SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) (Bremen Optimal Estimation DOAS, BESD v2.00.08) as well as the CarbonTracker (CT2013b) simulated CO2 mole fraction fields and the Monitoring Atmospheric Composition and Climate (MACC) CO2 inversion system (v13.1) and compare these to Total Carbon Column Observing Network (TCCON) observations (GGG2012/2014). We find standard deviations of 0.9, 0.9, 1.7, and 2.1 parts per million vs. TCCON for CT2013b, MACC, GOSAT, and SCIAMACHY, respectively, with the single observation errors 1.9 and 0.9 times the predicted errors for GOSAT and SCIAMACHY, respectively. We quantify how satellite error drops with data averaging by interpreting according to (error(sup 2) equals a(sup 2) plus b(sup 2) divided by n (with n being the number of observations averaged, a the systematic (correlated) errors, and b the random (uncorrelated) errors). a and b are estimated by satellites, coincidence criteria, and hemisphere. Biases at individual stations have year

  4. Analysis and evaluation of the Electronic Health Record standard in China: a comparison with the American national standard ASTM E 1384.

    Science.gov (United States)

    Xu, Wei; Guan, Zhiyu; Cao, Hongxin; Zhang, Haiyan; Lu, Min; Li, Tiejun

    2011-08-01

    To analyze and evaluate the newly issued Electronic Health Record (EHR) Architecture and Data Standard of China (Chinese EHR Standard) and identify areas of improvement for future revisions. We compared the Chinese EHR Standard with the standard of the American Society for Testing and Materials Standard Practice for Content and Structure of Electronic Health Records in the United States (ASTM E 1384 Standard). The comparison comprised two steps: (1) comparing the conformance of the two standards to the international standard: Health Informatics-Requirements for an Electronic Health Record Architecture (ISO/TS 18308), and showing how the architectures of the two standards satisfy or deviate from the ISO requirements and (2) comparing the detailed data structures between the two standards. Of the 124 requirement items in ISO/TS 18308, the Chinese EHR Standard and the ASTM E 1384 Standard conformed to 77 (62.1%) and 111 (89.5%), respectively. The Chinese EHR Standard conformed to 34 of 50 Structure requirements (68.0%), 22 of 24 Process requirements (91.7%), and 21 of 50 Other requirements (42.0%). The ASTM E 1384 Standard conformed to 49 of 50 Structure requirements (98.0%), 23 of 24 Process requirements (95.8%), and 39 of 40 Other requirements (78.0%). Further development of the Chinese EHR Standard should focus on supporting privacy and security mechanism, diverse data types, more generic and extensible lower level data structures, and relational attributes for data elements. Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.

  5. Computer program for obtaining thermodynamic and transport properties of air and products of combustion of ASTM-A-1 fuel and air

    Science.gov (United States)

    Hippensteele, S. A.; Colladay, R. S.

    1978-01-01

    A computer program for determining desired thermodynamic and transport property values by means of a three-dimensional (pressure, fuel-air ratio, and either enthalpy or temperature) interpolation routine was developed. The program calculates temperature (or enthalpy), molecular weight, viscosity, specific heat at constant pressure, thermal conductivity, isentropic exponent (equal to the specific heat ratio at conditions where gases do not react), Prandtl number, and entropy for air and a combustion gas mixture of ASTM-A-1 fuel and air over fuel-air ratios from zero to stoichiometric, pressures from 1 to 40 atm, and temperatures from 250 to 2800 K.

  6. Tamponamento cardíaco tardio traumático: análise de cinco casos Traumatic late cardiac tamponade: analysis of five cases

    Directory of Open Access Journals (Sweden)

    FERNANDO LUIZ WESTPHAL

    2000-09-01

    Full Text Available São analisados cinco casos de tamponamento cardíaco tardio traumático. Os pacientes eram masculinos, idade média de 26,2 anos, vítimas de ferimento por arma branca em região precordial, área de Ziedler, sendo admitidos em centro de referência para trauma. Foram classificados pelo índice fisiológico de Ivatury para trauma cardíaco e inicialmente tratados por pleurotomia intercostal e reposição volêmica, com estabilização do quadro hemodinâmico e respiratório. Os pacientes foram readmitidos após intervalo de oito a 24 dias (mediana de 20 dias, agora no serviço de cirurgia torácica de um hospital de referência terciária, com sinais de tamponamento cardíaco. Os exames diagnósticos confirmaram derrame pericárdico com espessamento pericárdico associado a encarceramento de base pulmonar esquerdo em quatro casos, os quais foram abordados por toracotomia póstero-lateral, com realização de pericardiectomia parcial e descorticação pulmonar. Um paciente evoluiu com pericardite purulenta, comprovada por exames complementares, e foi submetido à drenagem pericárdica subxifóidea. Ocorreu arritmia pós-operatória em um paciente; os demais evoluíram sem complicações pós-operatórias ou recidiva do tamponamento.Five traumatic late cardiac tamponade cases were analyzed. All patients were male, mean age was 26.2, victims of thoracic penetrating stabbing wound in the precordial region, Ziedler area, admitted to a trauma reference center. They were classified by the Ivatury physiological index for cardiac trauma. The first treatment approach was intercostal pleurectomy and volemic resuscitation followed by hemodynamic and respiratory recovery. Patients with cardiac tamponade symptoms were re-admitted within an interval from eight to twenty four days (mean 20 days in a thoracic surgery service of a tertiary reference hospital. Diagnostic exams confirmed thickening and pericardial effusion associated with a left pulmonary base

  7. Avaliação do sopro cardíaco na infância Assessment of heart murmurs in childhood

    Directory of Open Access Journals (Sweden)

    Maria Elisabeth B.A. Kobinger

    2003-06-01

    Full Text Available OBJETIVO: discutir a avaliação clínica e laboratorial do sopro cardíaco, considerando sua alta freqüência no atendimento ambulatorial do pediatra geral. FONTE DE DADOS: revisão baseada na análise crítica da literatura atual e consulta a compêndios de cardiologia pediátrica e pediatria contendo informações básicas sobre o tema. SÍNTESE DOS DADOS: os principais destaques do artigo referem-se à importância da anamnese e exame físico do sistema cardiovascular, essenciais para o pediatra geral diagnosticar o sopro cardíaco inocente, e identificar situações que indiquem a ocorrência de cardiopatias congênitas, ou adquiridas, e a necessidade de encaminhamento ao especialista. CONCLUSÕES: o pediatra geral é geralmente o primeiro médico a detectar um sopro cardíaco e deve estar apto a reconhecer o sopro inocente, assim como a suspeitar precocemente de doenças cardiovasculares.OBJECTIVE: to discuss clinical and laboratorial evaluation of heart murmurs in children, an important problem faced by pediatricians in their practice. SOURCES OF DATA: this review was based on a critical analysis of the current literature, as well as pediatrics and pediatric cardiology textbooks, which were found to be an important source of information on the subject. SUMMARY OS THE FINDINGS: it is important for pediatricians to know how to obtain precise information regarding the patient's medical history and to perform extensive physical examination of a child with heart murmur. The diagnosis of innocent heart murmur is essentially clinical and it can help the pediatrician to identify situations which are associated with cardiovascular diseases. CONCLUSIONS: in our series, short-term video-EEG monitoring established a reliable diagnosis in most patients due to correlation between clinical and EEG data. This procedure was well tolerated by children, including infants and those with psychiatric disorders.

  8. Cardiac beta-receptors in experimental Chagas' disease Receptores beta cardíacos na doença de Chagas experimental

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    Julio E. Enders

    1995-02-01

    Full Text Available Experimental Chagas' disease (45 to 90 days post-infection showed serious cardiac alterations in the contractility and in the pharmacological response to beta adrenergic receptors in normal and T. cruzi infected mice (post-acute phase. Chagasic infection did not change the beta receptors density (78.591 ± 3.125 fmol/mg protein and 73.647 ± 2.194 fmol/mg protein for controls but their affinity was significantly diminished (Kd = 7.299 ± 0.426 nM and Kd = 3.759 ± 0.212 nM for the control p Estudaram-se os receptores beta cardíacos de camundongos infectados pelo Trypanosoma cruzi na fase pós-aguda da doença de Chagas para estabelecer em que medida os mesmos contribuem a gerar respostas anômalas às catecolaminas observadas nestes miocardios. Utilizara-se 3-H/DHA para a marcação dos receptores beta cardíacos dos camundongos normais e dos infectados na fase pós-aguda (45 a 90 dias pós-infecção. O número dos sítios de fixação foi similar nos dois grupos, 78.591 ± 3.125 fmol/mg. Proteína nos chagásicos e 73.647 ± 2.194 fmol/mg. Proteína no grupo controle. Em vez disso, a afinidade verificou-se significativamente diminuida no grupo chagásico (Kd = 7.299 ± 0.426 nM respeito do controle (Kd = 3.759 ± 0.212 nM p < 0.001. Os resultados obtidos demonstram que as modificações observadas na estimulação adrenérgica do miocárdio chagásico se correlacionam com a menor afinidade dos receptores beta cardíacos e que estas alterações exerceriam uma parte determinante para as consequências funcionais que são detectadas na fase crônica.

  9. Imunodepressão induzida por talidomida e ciclosporina em transplante cardíaco heterotópico de coelho

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    João Batista Vieira de Carvalho

    Full Text Available OBJETIVO: A talidomida, por seus efeitos antiinflamatórios e imunodepressores, tem sido utilizada no tratamento de doenças dermatológicas e na doença enxerto-contra-hospedeiro no transplante de medula óssea. O objetivo deste trabalho é avaliar a ação deste medicamento como imunodepressor em transplante de órgãos, estudando sua ação isoladamente ou em combinação com a ciclosporina na prevenção da rejeição ao aloenxerto cardíaco heterotópico em coelho. MÉTODO: Foram utilizados 50 coelhos, sendo 25 doadores e 25 receptores.Os animais receptores foram subdivididos em cinco grupos (n= 5 : Grupo I (controle animais não-imunodeprimidos; Grupo II (imunodeprimidos com ciclosporina na dose de 10 mg/kg/dia; Grupo III (imunodeprimidos com talidomida na dose de 100 mg/kg/dia; Grupo IV (imunodeprimidos com ciclosporina na dose de 5,0 mg/kg/dia e Grupo V (imunodeprimidos com ciclosporina na dose de 5,0 mg/kg/dia associada a talidomida na dose de 50 mg/kg/dia. Os medicamentos foram administrados através de cateter orogástrico, a partir do dia anterior ao transplante. RESULTADOS: O coração do doador foi implantado no abdome dos receptores. A associação de talidomida e ciclosporina apresentou o menor escore histopatológico de rejeição (p < 0,05. Observou-se que a talidomida empregada isoladamente ou associada à ciclosporina foi efetiva contra a rejeição, aumentando a sobrevida (p < 0,01 de animais submetidos ao transplante cardíaco heterotópico em posição abdominal. CONCLUSÕES: A talidomida empregada isoladamente, ou associada à ciclosporina, pode representar uma opção de imunodepressão em transplantes cardíaco heterotópico experimental de coelho.

  10. Transplante experimental cardíaco heterotópico e cutâneo em camundongos Experimental heterotopic cardiac and cutaneous transplantation in mice

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    Patrícia Sestrheim

    2005-06-01

    Full Text Available OBJETIVO: Estudo experimental com o objetivo de desenvolver e avaliar a viabilidade das técnicas de transplante experimental cardíaco heterotópico abdominal vascularizado e cutâneo em camundongos, criando um instrumento para investigação da eficácia de soluções de preservação, novas drogas imunossupressoras, agentes biológicos, terapia gênica e indução de tolerância imunológica. MÉTODO: Para este estudo, as técnicas utilizadas foram descritas previamente por Corry et al. e Billingham et al. RESULTADOS: O tempo cirúrgico total para a realização dos transplantes cardíacos (n=20 foi, em média, 60,3±6,3 minutos e para os transplantes cutâneos (n=20, 17,75±0,71 minutos. A média de sobrevida dos aloenxertos cutâneos (n=34 e cardíacos (n=24 foi, respectivamente, 7 e 11 dias, enquanto que os isoenxertos sobreviveram por mais de 100 dias. CONCLUSÕES: Ambas as técnicas se caracterizaram pela fácil reprodutibilidade dos modelos experimentais. As diferenças entre as técnicas não se limitaram às peculiaridades metodológicas ou ao tempo de sobrevida e vascularização, mas principalmente à sua imunogenicidade e suscetibilidade à rejeição.OBJECTIVE: This is an experimental study which aims at developing and evaluating the feasibility of experimental techniques of vascularized and cutaneous abdominal heterotopic heart transplant in mice, creating an instrument of investigation for the effectiveness of prservation solutions, new immunosuppressive drugs, biological agents, genetic therapy and induction of immunological tolerance. METHOD: The techniques used in this work were previously described by Corry et al. and Billingham et al. RESULTS: The total surgical time to perform the cardiac transplants (n=20 was on average 60.3+6.3 minutes and the time of cutaneous transplants (n= 20 17.75+0.71 minutes. The average survival of the cutaneous allografts (n=34 and cardiac (n=24 allografts was 7 and 11 days, respectively, while

  11. Quantificação de tecido conjuntivo do músculo cardíaco de cães

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    Hildebrando Gomes Benedicto

    2003-01-01

    Full Text Available Objetivou-se, neste trabalho, estudar a proporção de tecido conjuntivo existente na fração ventricular direita e esquerda do músculo cardíaco de cães, buscando, através da morfometria, dados referentes a inter-relação entre o tecido conjuntivo e o tecido muscular cardíaco, para o conhecimento das relações anátomo-funcionais da estrutura cardíaca, característica de determinados processos ligados a diminuição do trabalho do órgão. Utilizou-se 6 corações de cães SRD, machos e fêmeas, com idade entre 48 e 150 meses, pesando entre 18 e 30 Kg, sem alterações cardíacas, confirmado mediante exames eletrocardiográfico e ecocardiográfico. Preparou-se o material oriundo de três regiões ventriculares em relação a sua base, proximal, média e distal, tanto da face direita quanto da esquerda, segundo as técnicas histológicas convencionais e corados com Picrosirius red, Fucsina-Paraldeido e Tricromo de Gomori, para evidenciação das fibras conjuntivas. As lâminas foram analisadas com auxílio do Axioscópio Zeiss acoplado ao programa de análise de imagens KS-400 Zeiss. A quantidade de tecido conjuntivo no Ventrículo Esquerdo variou de 0,44 a 26,26%; no Ventrículo Direito variou de 0,97 a 21,18%; no ápice variou de 1,32 a 29,24% e no septo interventricular variou de 5,41 a 11,24%. Os resultados obtidos mostram que há uma complexa rede de fibras conjuntivas envolvendo as fibras do tecido muscular cardíaco e que sua quantidade e disposição é muito variada, dependendo da região estudada.

  12. Investigating fractional exhaled nitric oxide (FeNO) in chronic obstructive pulmonary disease (COPD) and asthma-COPD overlap (ACO): a scoping review protocol.

    Science.gov (United States)

    Mostafavi-Pour-Manshadi, Seyed-Mohammad-Yousof; Naderi, Nafiseh; Barrecheguren, Miriam; Dehghan, Abolfazl; Bourbeau, Jean

    2017-12-21

    During the last decade, many articles have been published, including reviews on fractional exhaled nitric oxide (FeNO) use and utility in clinical practice and for monitoring and identifying eosinophilic airway inflammation, especially in asthma, and evaluating corticosteroid responsiveness. However, the exact role of FeNO in patients with chronic obstructive pulmonary disease (COPD) and its ability to distinguish patients with COPD and those having concomitant asthma, that is, asthma-COPD overlap (ACO) is still unclear and needs to be defined. Due to the broad topics of FeNO in chronic airway disease, we undertook a scoping review. The present article describes the protocol of a scoping review of peer-reviewed published literature specific to FeNO in COPD/ACO over the last decade. We used Joanna Briggs Institute Reviewers' Manual scoping review methodology as well as Levac et al 's and Arksey et al 's framework as guides. We searched a variety of databases, including Medline, Embase, Cumulative Index to Nursing and Allied Health Literature (CINAHL), Cochrane Library, Web of Science, and BioSciences Information Service (BIOSIS) on 29 June 2016. Additional studies will be recognised by exploring the reference list of identified eligible studies. Screening of eligible studies will be independently performed by two reviewers and any disagreement will be solved by the third reviewer. We will analyse the gathered data from article bibliographies and abstracts. To investigate the body of published studies regarding the role of FeNO in patients with COPD and its usefulness in the clinical setting, a scoping review can be used as a modern and pioneer model, which does not need ethics approval. By this review, new insights for conducting new research specific to FeNO in COPD/ACO population will emerge. The results of this study will be reported in the scientific meetings and conferences, which aim to provide information to the clinicians, primary care providers and basic

  13. Endovascular repair of an aorto-iliac aneurysm succeeded by kidney transplantation Tratamento endovascular de aneurisma aorto-ilíaco sucedido por transplante renal

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    Marcelo Bellini Dalio

    2010-09-01

    Full Text Available We present the case of aorto-iliac aneurysm in a patient with chronic renal failure requiring dialysis who were treated with an endovascular stent graft and, later on, submitted to kidney transplantation. A 53-year-old male with renal failure requiring dialysis presented with an asymptomatic abdominal aorto-iliac aneurysm measuring 5.0cm of diameter. He was treated with endovascular repair technique, being used an endoprosthesis Excluder®. After four months, he was successfully submitted to kidney transplantation (dead donor, with anastomosis of the graft renal artery in the external iliac artery distal to the endoprosthesis. The magnetic resonance imaging, carried out 30 days after the procedure, showed a good positioning of the endoprosthesis and adequate perfusion of the renal graft. In the follow-up, the patient presented improvement of nitrogenous waste, good positioning of the endoprosthesis without migration or endoleak. The endovascular repair of aorto-iliac aneurysm in a patient with end-stage renal failure under hemodialysis treatment showed to be feasible, safe and efficient, as it did not prevent the success of the posterior kidney transplantation.Apresentamos o caso de aneurisma aortoilíaco em um paciente com insuficiência renal crônica dialítica tratado com uma endoprótese vascular, sendo, após, submetido a transplante renal. Um homem de 53 anos com insuficiência renal dialítica apresentava um aneurisma abdominal aortoilíaco assintomático com 5,0cm de diâmetro. Foi tratado com técnica endovascular com uma endoprótese Excluderâ. Após quatro meses, foi submetido a transplante renal (doador cadáver com sucesso, com anastomose da artéria renal do enxerto na artéria ilíaca externa distal à endoprótese. A ressonância magnética 30 dias após o procedimento mostrou a endoprótese bem posicionada e o enxerto renal bem perfundido. No seguimento, o paciente evoluiu com melhora das escórias nitrogenadas, bom

  14. 123. Intervención quirúrgica urgente en paciente varón joven con angiosarcoma primario cardíaco con diagnóstico de tromboembolismo pulmonar agudo

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    N. Miranda

    2012-04-01

    Conclusiones: Son infrecuentes los casos de sarcoma cardíaco primario publicados en la bibliografía y muy pocos los que han cursado como tromboembolismo pulmonar agudo. Este caso ilustra la enorme dificultad que presentan para un diagnóstico y tratamiento precoz que ofrezca unas mínimas expectativas de vida a medio plazo.

  15. Bioimpedância transtorácica comparada à ressonância magnética na avaliação do débito cardíaco

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    Humberto Villacorta Junior

    Full Text Available FUNDAMENTO: A ressonância magnética cardíaca é considerada o método padrão-ouro para o cálculo de volumes cardíacos. A bioimpedância transtorácica cardíaca avalia o débito cardíaco. Não há trabalhos que validem essa medida comparada à ressonância. OBJETIVO: Avaliar o desempenho da bioimpedância transtorácica cardíaca no cálculo do débito cardíaco, índice cardíaco e volume sistólico, utilizando a ressonância como padrão-ouro. MÉTODOS: Avaliados 31 pacientes, com média de idade de 56,7 ± 18 anos, sendo 18 (58% do sexo masculino. Foram excluídos os pacientes cuja indicação para a ressonância magnética cardíaca incluía avaliação sob estresse farmacológico. A correlação entre os métodos foi avaliada pelo coeficiente de Pearson, e a dispersão das diferenças absolutas em relação à média foi demonstrada pelo método de Bland-Altman. A concordância entre os métodos foi realizada pelo coeficiente de correlação intraclasses. RESULTADOS: A média do débito cardíaco pela bioimpedância transtorácica cardíaca e pela ressonância foi, respectivamente, 5,16 ± 0,9 e 5,13 ± 0,9 L/min. Observou-se boa correlação entre os métodos para o débito cardíaco (r = 0,79; p = 0,0001, índice cardíaco (r = 0,74; p = 0,0001 e volume sistólico (r = 0,88; p = 0,0001. A avaliação pelo gráfico de Bland-Altman mostrou pequena dispersão das diferenças em relação à média, com baixa amplitude dos intervalos de concordância. Houve boa concordância entre os dois métodos quando avaliados pelo coeficiente de correlação intraclasses, com coeficientes para débito cardíaco, índice cardíaco e volume sistólico de 0,78, 0,73 e 0,88, respectivamente (p < 0,0001 para todas as comparações. CONCLUSÃO: A bioimpedância transtorácica cardíaca mostrou-se acurada no cálculo do débito cardíaco quando comparada à ressonância magnética cardíaca.

  16. Investigação de lipofuscina em miócitos cardíacos de camundongos após tratamento com oxamniquine

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    Maria Luiza Silveira Mello

    1984-10-01

    Full Text Available A fluorescencia natural devida à presença de corpos de lipofuscina foi pesquisada em miócitos cardíacos de camundongos adultos jovens tratados com oxamniquine. O objetivo foi buscar uma evidência de indução de envelhecimento celular precoce, com base em dados prévios de acentuação poliploidia, promovida pela droga. Comparando o miocárdio dos camundongos tratados com animais contrôle jovens e velhos, não foi observada a presença de lipofuscina nos seus miócitos. Isto possivelmente se deva a um não comprometimento da eficiência das lipases lisossomiais apesar da acentuação do fenômeno de poliploidização induzida pela droga.

  17. Efecto de la incorporación de fibras dietéticas en la calidad de panes para celíacos

    OpenAIRE

    Díaz Malmierca, Álvaro

    2013-01-01

    La investigación en la elaboración de panes sin gluten está muy avanzada, siendo el déficit en micronutrientes de estos productos uno de los problemas sobre el que se está centrando la investigación. Uno de los nutrientes más deficitarios, y que más problemas causa sobre la salud de los pacientes celíacos es la fibra dietética. En este estudio se ha investigado el efecto que produce la adición de un 10% de diferentes fibras sobre las características de los panes, la influencia ...

  18. Cerebral physiology and preservation during cardiac arrest Fisiología y preservación cerebral durante el paro cardíaco: vulnerabilidad del cerebro

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    Luis M. Gómez

    1991-03-01

    Full Text Available

    Cerebral physiology during cardiac arrest is discussed with particular Interest on selective neuronal damage. Previous concepts on brain tolerance to hypoxia are analyzed and new information about brain function prognosis after cardiac arrest is presented. Therapeutic alternatives for brain preservation are discussed with emphasis on the lack of effectiveness of barbiturates, the results of research with other drugs and the future role that blockers of excitatory neurotransmission may have as elements of cerebral preservation.

    Se hace una aproximación a la fisiología cerebral durante el paro cardíaco, destacando el concepto de darlo neuronal selectivo. Se presentan elementos que permiten modificar concepciones antiguas sobre la tolerancia del cerebro a la hipoxia severa. Además, se hace un nuevo planteamiento sobre el pronóstico cerebral luego de un paro cardíaco y se esbozan las alternativas terapéuticas utilizadas hasta la fecha para la preservación cerebral. Se hace énfasis en la inefectividad de los barbitúricos, en la investigación sobre la terapia con otras drogas y en el futuro abierto hacia los bloqueadores de los neurotransmisores excitadores, como elementos terapéuticos para la preservación cerebral.

  19. Fitting psychometric functions using a fixed-slope parameter: an advanced alternative for estimating odor thresholds with data generated by ASTM E679.

    Science.gov (United States)

    Peng, Mei; Jaeger, Sara R; Hautus, Michael J

    2014-03-01

    Psychometric functions are predominately used for estimating detection thresholds in vision and audition. However, the requirement of large data quantities for fitting psychometric functions (>30 replications) reduces their suitability in olfactory studies because olfactory response data are often limited (ASTM) E679. The slope parameter of the individual-judge psychometric function is fixed to be the same as that of the group function; the same-shaped symmetrical sigmoid function is fitted only using the intercept. This study evaluated the proposed method by comparing it with 2 available methods. Comparison to conventional psychometric functions (fitted slope and intercept) indicated that the assumption of a fixed slope did not compromise precision of the threshold estimates. No systematic difference was obtained between the proposed method and the ASTM method in terms of group threshold estimates or threshold distributions, but there were changes in the rank, by threshold, of judges in the group. Overall, the fixed-slope psychometric function is recommended for obtaining relatively reliable individual threshold estimates when the quantity of data is limited.

  20. Validation of standard ASTM F2732 and comparison with ISO 11079 with respect to comfort temperature ratings for cold protective clothing.

    Science.gov (United States)

    Gao, Chuansi; Lin, Li-Yen; Halder, Amitava; Kuklane, Kalev; Holmér, Ingvar

    2015-01-01

    American standard ASTM F2732 estimates the lowest environmental temperature for thermal comfort for cold weather protective clothing. International standard ISO 11079 serves the same purpose but expresses cold stress in terms of required clothing insulation for a given cold climate. The objective of this study was to validate and compare the temperature ratings using human subject tests at two levels of metabolic rates (2 and 4 MET corresponding to 116.4 and 232.8 W/m(2)). Nine young and healthy male subjects participated in the cold exposure at 3.4 and -30.6 °C. The results showed that both standards predict similar temperature ratings for an intrinsic clothing insulation of 1.89 clo and for 2 MET activity. The predicted temperature rating for 2 MET activity is consistent with test subjects' thermophysiological responses, perceived thermal sensation and thermal comfort. For 4 MET activity, however, the whole body responses were on the cold side, particularly the responses of the extremities. ASTM F2732 is also limited due to its omission and simplification of three climatic variables (air velocity, radiant temperature and relative humidity) and exposure time in the cold which are of practical importance. Copyright © 2014 Elsevier Ltd and The Ergonomics Society. All rights reserved.

  1. Application of Response Surface Methodology for Modeling of Postweld Heat Treatment Process in a Pressure Vessel Steel ASTM A516 Grade 70.

    Science.gov (United States)

    Peasura, Prachya

    2015-01-01

    This research studied the application of the response surface methodology (RSM) and central composite design (CCD) experiment in mathematical model and optimizes postweld heat treatment (PWHT). The material of study is a pressure vessel steel ASTM A516 grade 70 that is used for gas metal arc welding. PWHT parameters examined in this study included PWHT temperatures and time. The resulting materials were examined using CCD experiment and the RSM to determine the resulting material tensile strength test, observed with optical microscopy and scanning electron microscopy. The experimental results show that using a full quadratic model with the proposed mathematical model is YTS = -285.521 + 15.706X1 + 2.514X2 - 0.004X1(2) - 0.001X2(2) - 0.029X1X2. Tensile strength parameters of PWHT were optimized PWHT time of 5.00 hr and PWHT temperature of 645.75°C. The results show that the PWHT time is the dominant mechanism used to modify the tensile strength compared to the PWHT temperatures. This phenomenon could be explained by the fact that pearlite can contribute to higher tensile strength. Pearlite has an intensity, which results in increased material tensile strength. The research described here can be used as material data on PWHT parameters for an ASTM A516 grade 70 weld.

  2. ASTM Committee C28: International Standards for Properties and Performance of Advanced Ceramics-Three Decades of High-Quality, Technically-Rigorous Normalization

    Science.gov (United States)

    Jenkins, Michael G.; Salem, Jonathan A.

    2016-01-01

    Physical and mechanical properties and performance of advanced ceramics and glasses are difficult to measure correctly without the proper techniques. For over three decades, ASTM Committee C28 on Advanced Ceramics, has developed high-quality, technically-rigorous, full-consensus standards (e.g., test methods, practices, guides, terminology) to measure properties and performance of monolithic and composite ceramics that may be applied to glasses in some cases. These standards contain testing particulars for many mechanical, physical, thermal, properties and performance of these materials. As a result these standards are used to generate accurate, reliable, repeatable and complete data. Within Committee C28, users, producers, researchers, designers, academicians, etc. have written, continually updated, and validated through round-robin test programs, 50 standards since the Committee's founding in 1986. This paper provides a detailed retrospective of the 30 years of ASTM Committee C28 including a graphical pictogram listing of C28 standards along with examples of the tangible benefits of standards for advanced ceramics to demonstrate their practical applications.

  3. Evaluating the Sporicidal Activity of Disinfectants against Clostridium difficile and Bacillus amyloliquefaciens Spores by Using the Improved Methods Based on ASTM E2197-11.

    Science.gov (United States)

    Uwamahoro, Marie Christine; Massicotte, Richard; Hurtubise, Yves; Gagné-Bourque, François; Mafu, Akier Assanta; Yahia, L'Hocine

    2018-01-01

    Spore-forming pathogenic bacteria, such as Clostridium difficile , are associated with nosocomial infection, leading to the increased use of sporicidal disinfectants, which impacts socioeconomic costs. However, C. difficile can be prevented using microorganisms such as Bacillus amyloliquefaciens , a prophylactic agent that has been proven to be effective against it in recent tests or it can be controlled by sporicidal disinfectants. These disinfectants against spores should be evaluated according to a known and recommended standard. Unfortunately, some newly manufactured disinfectants like Bioxy products have not yet been tested. ASTM E2197-11 is a standard test that uses stainless steel disks (1 cm in diameter) as carriers, and the performance of the test formulation is calculated by comparing the number of viable test organisms to that on the control carriers. Surface tests are preferable for evaluating disinfectants with sporicidal effects on hard surfaces. This study applies improved methods, based on the ASTM E2197-11 standard, for evaluating and comparing the sporicidal efficacies of several disinfectants against spores of C. difficile and B. amyloliquefaciens , which are used as the test organisms. With the improved method, all spores were recovered through vortexing and membrane filtration. The results show that chlorine-based products are effective in 5 min and Bioxy products at 5% w/v are effective in 10 min. Although Bioxy products may take longer to prove their effectiveness, their non-harmful effects to hospital surfaces and people have been well established in the literature.

  4. ASTM Committee C28: International Standards for Properties and Performance of Advanced Ceramics, Three Decades of High-quality, Technically-rigorous Normalization

    Science.gov (United States)

    Jenkins, Michael G.; Salem, Jonathan A.

    2016-01-01

    Physical and mechanical properties and performance of advanced ceramics and glasses are difficult to measure correctly without the proper techniques. For over three decades, ASTM Committee C28 on Advanced Ceramics, has developed high quality, rigorous, full-consensus standards (e.g., test methods, practices, guides, terminology) to measure properties and performance of monolithic and composite ceramics that may be applied to glasses in some cases. These standards testing particulars for many mechanical, physical, thermal, properties and performance of these materials. As a result these standards provide accurate, reliable, repeatable and complete data. Within Committee C28 users, producers, researchers, designers, academicians, etc. have written, continually updated, and validated through round-robin test programs, nearly 50 standards since the Committees founding in 1986. This paper provides a retrospective review of the 30 years of ASTM Committee C28 including a graphical pictogram listing of C28 standards along with examples of the tangible benefits of advanced ceramics standards to demonstrate their practical applications.

  5. Sedação com sufentanil e clonidina em pacientes submetidos a cateterismo cardíaco Sedación con sufentanil y clonidina en pacientes sometidos a cateterismo cardíaco Sedation with sufentanil and clonidine in patients undergoing heart catheterization

    Directory of Open Access Journals (Sweden)

    Anita Perpetua Carvalho Rocha

    2011-03-01

    Full Text Available FUNDAMENTO: A sedação para a realização de cateterismo cardíaco tem sido alvo de preocupação. Benzodiazepínicos, agonistas alfa-2 adrenérgicos e opioides são utilizados para esse fim, entretanto, cada um destes medicamentos possui vantagens e desvantagens. OBJETIVO: Avaliar a eficácia do sufentanil e da clonidina como sedativos em pacientes submetidos a cateterismo cardíaco, observando o impacto dos mesmos sobre os parâmetros hemodinâmicos e respiratórios, a presença de efeitos colaterais, além da satisfação do paciente e do hemodinamicista com o exame. MÉTODOS: Trata-se de um ensaio clínico prospectivo, duplo-cego, randomizado e controlado, que envolveu 60 pacientes que receberam 0,1 µg/kg de sufentanil ou 0,5 µg/kg de clonidina antes da realização do cateterismo cardíaco. O escore de sedação segundo a escala de Ramsay, a necessidade de utilização de midazolam, os efeitos colaterais, os parâmetros hemodinâmicos e respiratórios foram registrados, sendo os dados analisados em 06 diferentes momentos. RESULTADOS: O comportamento da pressão arterial, da frequência cardíaca e da frequência respiratória foi semelhante nos dois grupos, entretanto, no momento 2, os pacientes do grupo sufentanil (Grupo S apresentaram menor escore de sedação segundo a escala de Ramsay, e a saturação periférica da oxihemoglobina foi menor que o grupo clonidina (Grupo C no momento 6. Os pacientes do Grupo S apresentaram maior incidência de náusea e vômito pós-operatório que os pacientes do Grupo C. A satisfação dos pacientes foi maior no grupo clonidina. Os hemodinamicistas mostraram-se satisfeitos nos dois grupos. CONCLUSÃO: O sufentanil e a clonidina foram efetivos como sedativos em pacientes submetidos a cateterismo cardíaco.FUNDAMENTO: La sedación para la realización de cateterismo cardíaco ha sido blanco de preocupación. Benzodiazepínicos, agonistas alfa-2 adrenérgicos y opioides son utilizados para ese fin

  6. Perfil dos pacientes na Lista Única de Espera para transplante cardíaco no estado do Ceará Perfil de los pacientes en la lista única de espera para transplante cardíaco en el estado de Ceará Profile of patients in the Unified Waiting List for heart transplantation in state of Ceará

    Directory of Open Access Journals (Sweden)

    Francisca Elisângela Teixeira Lima

    2010-07-01

    Full Text Available FUNDAMENTO: Os transplantes de órgãos têm aumentado consideravelmente nos últimos anos em razão da evolução tecnológica e da sensibilização da sociedade para doação de órgãos. OBJETIVO: Descrever as características dos pacientes da Lista Única de Espera para transplante cardíaco; identificar as principais cardiopatias; e verificar o tempo médio de permanência do paciente na Lista até a realização da cirurgia. MÉTODOS: Trata-se de um estudo descritivo, documental e retrospectivo, com abordagem quantitativa, desenvolvido na Central de Transplante do Estado do Ceará, com 156 pacientes incluídos na Lista Única de Espera do ano de 1999 a 2006. Os dados foram organizados em figuras. RESULTADOS: Foram encontrados: 81% do sexo masculino; 22,4% adultos jovens (20 a 40 anos e 56,4% adultos de meia-idade (40 a 64 anos, com uma média de 36 anos; 79% procedentes de Fortaleza-CE; 91% tinham miocardiopatia como causa do transplante cardíaco. Dentre esses pacientes 102 (69% foram transplantados; 37 (25% evoluíram para óbito antes do transplante e 8 (6% foram excluídos por melhora ou piora do quadro clínico. CONCLUSÃO: Os pacientes da Lista Única de Espera para transplante cardíaco no Estado do Ceará, no período de 1999 a 2006, eram do sexo masculino (80%, com faixa etária variando de 1 a 71 anos, com predomínio da miocardiopatia dilatada (53,4%, e o tempo médio de espera foi de 136 dias até o dia do transplante cardíaco.FUNDAMENTO: Los transplantes de órganos han aumentado considerablemente en los últimos años, en razón de la evolución tecnológica y de la sensibilización de la sociedad para la donación de órganos. OBJETIVO: Describir las características de los pacientes de la Lista Única de Espera para transplante cardíaco; identificar las principales cardiopatías; y verificar el tiempo medio de permanencia del paciente en la Lista hasta la realización de la cirugía. MÉTODOS: Se trata de un estudio

  7. Prevalence of nursing diagnosis of decreased cardiac output and the predictive value of defining characteristics in patients under evaluation for heart transplant Prevalencia del diagnóstico de enfermería de disminución del gasto cardíaco y valor predictivo de las características definidoras en pacientes en fase de evaluación para trasplante cardíaco Prevalência do diagnóstico de enfermagem de débito cardíaco diminuído e valor preditivo das características definidoras em pacientes em avaliação para transplante cardíaco

    Directory of Open Access Journals (Sweden)

    Lígia Neres Matos

    2012-04-01

    Full Text Available The purposes of the study were to identify the prevalence of defining characteristics (DC of decreased cardiac output (DCO in patients with cardiac insufficiency under evaluation for heart transplantation, and to ascertain the likelihood of defining characteristics being predictive factors for the existence of reduction in cardiac output. Data was obtained by retrospective documental analysis of the clinical records of right-sided heart catheterizations in 38 patients between 2004 and 2009. The results showed that 71.1% of the patients had decreased cardiac output (measured by cardiac index. The majority of the NANDA-International defining characteristics for DCO were more frequent in individuals with reduced cardiac index levels. The study emphasizes the odds ratio (OR for increased Systemic Vascular Resistance of OR=4.533, of the third heart sound with OR=3.429 and the reduced ejection fraction with OR=2.850. By obtaining the predictive values for the defining characteristics the study identifies them as diagnostic indicators of decreased cardiac output.El estudio tiene como objetivos identificar la prevalencia de las características definitorias de la disminución del gasto cardíaco (DGC en pacientes con insuficiencia cardíaca (IC en evaluación para el trasplante de corazón y ver la probabilidad de las características definitorias sean factores predictivos de la existencia de una disminución del gasto cardíaco. Los datos se obtuvieron mediante el análisis documental retrospectivo de historias clínicas de cateterismo cordiaco derecho en 38 pacientes con insuficiencia cardíaca en la evaluación para el trasplante de corazón entre 2004 y 2009. Los resultados mostraron que el 71% de los pacientes habían reducido el gasto cardíaco (medido por el índice cardíaco. La mayoría de las características definitorias de la NANDA-International para el DGC fueron más frecuentes en individuos con índice cardíaco reducido. Los aspectos m

  8. Qualidade de vida de pacientes submetidos ao transplante cardíaco: aplicação da escala Whoqol-Bref Calidad de vida de pacientes sometidos a transplante cardíaco: aplicación de la escala Whoqol-Bref Quality of life of patients that had a heart transplant: application of Whoqol-Bref scale

    Directory of Open Access Journals (Sweden)

    Maria Isis Freire de Aguiar

    2011-01-01

    Full Text Available FUNDAMENTO: O sucesso do transplante cardíaco significa garantir a sobrevida dos pacientes com cardiopatia e permitir-lhes desenvolver suas atividades diárias. O transplante cardíaco apresenta-se como a primeira opção de tratamento na falência cardíaca, representando um aumento de sobrevida e qualidade de vida dos transplantados. OBJETIVO: Avaliar a qualidade de vida de pacientes submetidos ao transplante cardíaco através da aplicação de uma escala padronizada (Whoqol-Bref. MÉTODOS: Estudo exploratório descritivo de abordagem quantitativa, realizado com 55 pacientes submetidos ao transplante cardíaco, em um período entre o terceiro e o 103º mês, que realizam acompanhamento na Unidade de Transplante e Insuficiência Cardíaca em um Hospital de Referência em Cardiologia na cidade de Fortaleza, CE. Os dados foram coletados no período de fevereiro a abril de 2009, por meio da aplicação de um questionário padronizado pela Organização Mundial da Saúde e utilização de dados constantes nos prontuários. RESULTADOS: Com relação ao domínio físico, 62,8% e 58,3% dos pacientes, dos sexos masculino e feminino, respectivamente, estão satisfeitos. No domínio psicológico, dentre pacientes do sexo masculino, 65,1% apresentam satisfação quanto à qualidade de vida e, no sexo feminino, 58,3% encontram-se satisfeitas. No domínio das relações sociais, observou-se que, no sexo masculino, 53,5% estão muito satisfeitos, e apresentou-se um nível de satisfação de 100% no sexo feminino. No domínio do meio ambiente, 65,1% do sexo masculino encontram-se satisfeitos, e no sexo feminino, 83,3% estão satisfeitas. CONCLUSÃO: O transplante cardíaco teve bastante influência na qualidade de vida dos pacientes transplantados, pois os resultados mostram-se estatisticamente significantes no pós-transplante.FUNDAMENTO: El éxito del transplante cardíaco significa garantizar la sobrevida de los pacientes con cardiopatía y permitirles

  9. Kinetic and morphological differentiation of Ettringites in plain and blended Portland cements using Metakaolin and the ASTM C 452-68 test. Part I: kinetic differentiation

    Directory of Open Access Journals (Sweden)

    Talero, R.

    2008-12-01

    Full Text Available In this first part of the study, the results obtained in prior research with XRD and SEM, as well as the Le Chatelier-Ansttet test were confirmed with the ASTM C 452-68 test. To this end, 20%, 30% and 40% metakaolin (MK was added to ten Portland cements, six OPCs and four SRPCs. Both the ten plain PCs and the 30 metakaolin (MK blends were tested for two years under ASTM C 452-68 specifications, determining not only the percentage increase in length, ΔL(%, of the specimens, but also the sulphate content in the curing water. Other parameters studied included: chemical analysis of the cementitious materials used and specific properties of some of the cements tested.The experimental results, ΔL(% versus time, re-confirmed that the formation rate of ettringite from the reactive alumina, Al2O3r-, present in the pozzolan must be substantially higher than the formation rate of ettringite from the C3A present in the PC. This was verified by the variation of the sulphate content in the specimen curing water throughout the test. In light of those findings, in this article these two types of ettringite are denominated rapid forming ettringite or ett-rf, and slow forming ettringite or ett-lf.En esta Parte I de la investigación, se han logrado verificar mediante el ensayo ASTM C 452-68, los resultados obtenidos en anteriores investigaciones realizadas con DRX y SEM y el ensayo Le Chatelier-Ansttet. Para ello, a 10 cementos Portland –6 CPO y 4 CPRS– se les añadió 20%, 30% y 40% de metakaolín (MK. Tanto los 10 CP como los 30 de sus mezclas con metakaolín (MK, se ensayaron durante 2 años, mediante dicho método ASTM C 452-68, y a sus probetas no sólo se les determinó su incremento porcentual de longitud, ΔL(%, sino además, el contenido de sulfatos de sus aguas de conservación. Otras determinaciones complementarias fueron: análisis químico de los materiales cementiceos utilizados y propiedades específicas de algunos cementos ensayados

  10. Stress corrosion (Astm G30-90 standard) in 08x18H10T stainless steel of nuclear fuel storage pool in WWER reactors

    International Nuclear Information System (INIS)

    Herrera, V.; Zamora R, L.

    1997-01-01

    At the water storage of the irradiated nuclear fuel has been an important factor in its management. The actual pools have its walls covered with inoxidable steel and heat exchangers to dissipate the residual heat from fuel. It is essential to control the water purity to eliminate those conditions which aid to the corrosion process in fuel and at related components. The steel used in this research was obtained from an austenitic inoxidizable steel standardized with titanium 08x18H10T (Type 321) similar to one of the two steel coatings used to cover walls and the pools floor. the test consisted in the specimen deformation through an U ply according to the Astm G30-90 standard. The exposition of the deformed specimen it was realized in simulated conditions to the chemical regime used in pools. (Author)

  11. International cooperative effort to establish ASTM [American Society for Testing and Materials] standards for the measurement of radiation dose for food processing

    International Nuclear Information System (INIS)

    Farrar, H. IV.

    1987-01-01

    A task group has been formed within the American Society for Testing and Materials (ASTM) specifically to develop standards for measuring radiation dose for food processing. The task group, which has 78 members, including 16 from Europe, consists of a broad cross section of food industry, government, regulatory, manufacturing, and university interests. The group is working on seven standards; three specifically for food irradiation applications, and four for using specific dosimeter types for all radiation applications, including food processing. Together, this set of standards will specify acceptable methods of accomplishing the required irradiation treatment of food and other products, and will be available for adoption by regulatory agencies in food irradiation protocols. 1 tab

  12. Prediction methods for the calculation of the flammability properties of gases and vapors: CHETAH and ASTM software. Part 1. Esters and Ethers

    International Nuclear Information System (INIS)

    Gigante, L.; Dellavedova, M.; Pasturenzi, C.; Lunghi, A.; Cardillo, P.

    2008-01-01

    After the law by decree of the 12. June 2003, N 233 (ATEX Directive) and REACH regulation (Regulation EC n. 2907/2006 of the European Parliament), several industrial fields, also not chemical, need the flammability data for the substances used. Perhaps, many of these data, especially for compounds with not common uses, are not easy to collect. It would be helpful to provide prediction methods in order to calculate these data without any experimentation that sometimes results time consuming, expensive and practically impossible for all the commercial compounds. In this research the ASTM software CHETAH (CHEmical Thermodynamic And Hazard evaluation) has been used in order to compute the lower flammability limit (L i ), the limiting oxygen concentration (LOC, using nitrogen as inert gas) as a function of temperature, the adiabatic flame temperature T flame , the fundamental burning velocity (S u ), the quenching distance (Q d ), the minimum ignition energy (MIE) for esters and ethers, substances highly used in industry. [it

  13. Oxidación a alta temperatura de un acero ASTM A335 P92 en contacto con una mezcla de sales de

    OpenAIRE

    Jessica Rodríguez Pérez; Eduardo Santos Sánchez; Darío Yesid Peña Ballesteros; Anderson Sandoval Amador; Hugo Armando Estupiñán Durán

    2016-01-01

    En esta investigación se evaluó la oxidación del acero ASTM A335 P92 en una mezcla de sales 40% K2SO4 - 60% NaCl a temperaturas de 500ºC a 700ºC, a intervalos de 50°C con tiempos de exposición de 1, 3, 10, 30, 100 y 150 horas, utilizando la norma estandarizada por la Federación Europea de Corrosión. Se realizó análisis metalográfico y de dureza antes y después del ensayo para identificar el posible cambio estructural; se realizan pruebas de difracción de rayos X (DRX), microscopía electrónica...

  14. Localized corrosion evaluation of the ASTM F139 stainless steel marked by laser using scanning vibrating electrode technique, X-ray photoelectron spectroscopy and Mott–Schottky techniques

    International Nuclear Information System (INIS)

    Pieretti, Eurico F.; Manhabosco, Sara M.; Dick, Luís F.P.; Hinder, Steve; Costa, Isolda

    2014-01-01

    Graphical abstract: SEM image of pits found at the centred marked area, where the laser beam focused twice. - Highlights: • The effect of laser engraving on the corrosion resistance of the ASTM F139 was studied. • Scanning vibrating electrode technique was used to identify the anodic zone. • Laser engraving of austenitic stainless steels produces highly defective surfaces. • Laser engraving causes large chemical modification of the surface. • Pitting nucleates at the interface between laser affected and unaffected areas. - Abstract: The effect of laser engraving on the corrosion resistance of ASTM F139 stainless steel (SS) has been investigated by electrochemical techniques. The nucleation of localized corrosion on this biomaterial was evaluated by scanning vibrating electrode technique (SVET) in a phosphate buffered saline solution (PBS) of pH 7.4. The Mott–Schottky approach was used to determine the electronic properties of the passive film, also chemically characterized by X-ray photoelectron spectroscopy (XPS). SVET allowed the identification of the anodic zones on the surface of the SS marked by laser technique that were associated with the heat-affected areas. Metallic drops solidified on the laser marked surface dissolved actively at OCP and favoured the nucleation of crevice corrosion, while at the pitting potential, pits nucleate preferentially on the laser marks. XPS results showed that laser engraving caused large chemical modification of the surface. Mott–Schottky results indicated a more defective oxide layer with a larger number of donors on the laser marked surface comparatively to that without marks

  15. Damage characterization of an ASTM A 213 grade 91 tube after 116.000 h of service in a reforming plant

    International Nuclear Information System (INIS)

    Tonti, Andrea; Lega, Daniela; Antonini, Alessandra; Romitelli, Manuela; Alvino, Antonello

    2015-01-01

    ASTM A213 T91 steel is used in power plants and petrochemical industry, for long-term service components. The improved mechanical properties of grade 91 are strictly related to its specific microstructure: a tempered martensite matrix with fine precipitates embedded in. Despite low alloy heat resistant ferritic steels, that have a well known operational experience, T91 service performances are still faintly consolidated, because this material has serviced only in a limited number of plants, since the eighties. Most of the available data were obtained by laboratory tests on relatively short term creep strength and corrosion properties. The investigations reported in this paper represent an important opportunity to describe and better evaluate the damage evolution of the grade T91 steel after more than 100000 h of exposure in severe conditions (580 °C, 18–26 bar, combustion environment). Our results suggest that the steel suffered by different damage forms, which appear on definite portions of the tube cross section. The main degradation forms observed, in fact, into the tube bulk are both the martensite recovery and the microstructural evolution. This latter promoted mostly Laves phase precipitation and coarsening. On the other hand, both the outer and the inner wall side, suffered mainly by severe oxidation/carburization. Especially on the outer surface, the massive carbide precipitation has caused an evident loss of ductility so that the mechanical properties of the tube appear appreciably reduced. - Highlights: • ASTM A213 T91 steel is used in petrochemical industry, for long-term service components. • The investigations reported an evaluation of the damage evolution of the grade T91 steel. • Our results suggest that the steel suffered both the martensite recovery and the microstructural evolution. • The outer and the inner wall side, suffered mainly by severe oxidation/carburization. • Carbide precipitation caused loss of ductility so that the

  16. Effects of oxidation-nitridation in the presence of water vapor on ASTM A335 P92 steel using SEM-EDS and XPS characterization techniques

    Science.gov (United States)

    Orozco, J. C.; Kafarov, V.; Y Peña, D.; Alviz, A.

    2017-12-01

    This research studies the physical and chemical changes in steel ASTM A335 P92, produced from a typical refinery corrosion environment. The environment evaluated was oxidation-nitridation with the presence of water vapor. In this study five (5) exposure times were selected: 1, 20, 50, 100 and 200 hours; As well as two (2) analysis temperatures: 450 and 550°C. The working pressure used was one (1) atmosphere. Bearing in mind the kinetic study, the behaviour shown in ASTM A335 P92 steel describes an accelerated growth until 50 hours, after this time growth is less. For the tests carried out at 450°C, the kinetic constant was 2x10-8g2mm-4h-1, as well as for 550°C the calculated kinetic constant was 3.1×10-7g2mm-4h-1 through the SEM-EDS characterization techniques, it was possible to appreciate a good adhesion and homogeneity of the layers formed on the metal matrix until a time of exposure of 100 hours at 450 and 550°C, different from that evidenced to 200 hours of exposure where the layer formed near to the substrate showed detachment, this is attributed to the formation of hydroxides product of water vapor. Among the results obtained are the elemental composition, the presence of nitrides such as Si3N4, also NSiO2 and NSi2O, molybdenum oxides: MoO2 and MoO3 and iron oxides: FeO and Fe2O3 can be evidenced.

  17. Evolução hemodinâmica seqüencial no transplante cardíaco Sequential hemodynamic evaluation in heart transplantation

    Directory of Open Access Journals (Sweden)

    Noedir A. G Stolf

    1988-12-01

    Full Text Available O transplante cardíaco tem tido ampla aplicação no tratamento da cardiomiopatia em fase terminal. Grande interesse existe no estudo das alterações hemodinâmicas imediatas e na identificação dos fatores que determinam essas alterações. Quarenta e três pacientes transplantados foram estudados com esse objetivo. Os seguintes dados foram obtidos: índice cardíaco, as pressões nas câmaras cardíacas, capilar pulmonar, aorta, artéria pulmonar, volume sistólico, fração de ejeção do ventrículo esquerdo (VE, resistência vascular pulmonar e sistêmica, índice do trabalho sistólico do ventrículo esquerdo e direito (VD e o tríplice produto. Esses valores foram comparados de acordo com os episódios de rejeição e com diferentes valores do gradiente transpulmonar. Verificou-se que no pós-operatório imediato há depressão da função dos ventrículos decorrente de uma série de fatores. O índice cardíaco se mantém em valore adequados através de vários mecanismos e adaptação dos ventrículos, que ocorre mais precocemente para o VE do que para o VD. Tardiamente as alterações hemodinâmicas dependem do aparecimento de hipertensão arterial sistêmica e da aterosclerose coronária. A presença e os valores mais elevados do gradiente transpulmonar não tiveram influência estatisticamente significativa nas condições hemodinâmicas dos pacientes.heart transplantation has been widely employed in treatment of end stage cardiomyopathy. Great interest exists in the study of early and late hemodynamic alterations following the procedure. Fourty three patients submited to heart transplantation were studied with this aim. The data obtained were: cardiac index, pressure in the heart chambers, capillary wedge pressure, aorta and pulmonary artery pressure, systolic volume and ejection fraction of left ventricle, pulmonary and systemic vascular resistances; left and right work systolic indexes; triple product. The data were compared in

  18. Analysis of ferritic stainless steel tube applied in radiation furnaces; Analise de tubos de aco inoxidavel ferritico para aplicacao em fornos de radiacao

    Energy Technology Data Exchange (ETDEWEB)

    Porto, P.C.R.; Spim, J.A. [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Centro de Tecnologia. Lab. de Fundicao], e-mail: spim@ufrgs.br; Santos, C.A. [Pontificia Universidade Catolica do Rio Grande do Sul (PUC-RS), Porto Alegre, RS (Brazil). Fac. de Engenharia. Programa de Pos-Graduacao em Engenharia e Tecnologia de Materiais (PGETEMA)

    2006-07-01

    The objective of this work was to evaluate the change in mechanic properties and phase transformations of ferritic stainless steel tube, ASTM 268 Gr 446, applied in high temperature conditions. The work has used tubes from radiation furnaces of the PETROBRAS Xisto Industrialization Unit. The samples used for comparison were obtained from new tubes and tubes already used in furnaces. The test analyses were optical metallography, scanning electron microscopy, energy dispersive spectrometer, hardness and microhardness test and tension test. Results have shown that the new tubes presented a ferritic matrix and in old tubes were observed a great quantity of sigma phase and carbides. Along with the thickness of the tubes it was verified that the inside region presented an increase of sulfate and the outside region an increase of carbides. (author)

  19. Hemorrhage in cerebral metastasis from angiosarcoma of the heart: case report Hemorragia em metástase cerebral de angiossarcoma cardíaco: relato de caso

    Directory of Open Access Journals (Sweden)

    Pasquale Gallo

    2001-09-01

    Full Text Available The purpose of this article is to describe the clinical and pathological features of metastatic angiosarcoma in the central nervous system. Only a few cases of cerebral metastasis from angiosarcoma of the heart have been recorded in the literature; particulary related to intracerebral hemorrhage. A case of secondary cerebral angiosarcoma of the heart in a 33 years old man is presented. The initial symptoms were headache, vomiting, lethargy and aphasia. There was a mass in the left temporal lobe with hemorrhage and edema on the computerized tomography (CT. After 24 hours the neurological status worsened and another CT scan showed rebleeding on the tumor area. He underwent an emergency craniotomy but died two days after. Considering the longer survival of sarcoma patients with new modalities of treatment, the incidence of brain metastasis may increase, demanding a bether preventive and more aggressive approach. Besides, due to the hemorrhagic nature of such lesions, we suggest the imediate surgery to prevent a fast and lethal evolution because rebleeding.O propósito deste artigo é descrever os achados clínicos e patológicos das metástases de angiossarcoma no sistema nervoso central. Apenas poucos casos de metástases cerebrais de angiossarcoma cardíaco foram relatados na literatura, menos ainda relacionados a hemorragia intracerebral. Relatamos o caso de um tumor cerebral secundário a angiossarcoma cardíaco em um paciente masculino de 33 anos. Os sintomas iniciais foram: cefaléia, vômitos, letargia e afasia. A tomografia computadorizada mostrou massa no lobo temporal esquerdo associada a hemorragia e edema. Após 24 horas houve piora do estado neurológico e nova tomografia demonstrou ressangramento no leito tumoral. Foi submetido a uma craniotomia de urgência mas faleceu dois dias após. Considerando a longa sobrevida dos pacientes com sarcoma devido às novas modalidades terapêuticas, poderá aumentar a incidência de met

  20. Theory of monochromators based on holographic toroidal arrays for the X-UV spectrum band. Tests of the 'TGM 10 metres, 4 degrees' on the ACO storage ring

    International Nuclear Information System (INIS)

    Lizon a Lugrin, Eric

    1988-01-01

    As the use of synchrotron radiation is strongly increasing, needs for monochromators in the X-UV range are very important. This research thesis aimed at the development of prototype monochromator based toroidal lamellar arrays with grazing incidence. In the first part, the author recalls theoretical aspects of light scattering rules adapted to a lamellar array, and of wave-matter interaction rules. In the second part, he reports the calculation of the monochromator, its mechanical description, and its implementation on the light line of the ACO storage ring. In the third part, the author reports tests performed without any input slot and in reverse optical configuration on the ACO storage ring. The energy range, the linearity with respect to wave length, the rejection of higher orders of scattered light, flow and resolution are in compliance with expected values [fr

  1. Evaluation of Systemic Antioxidant Level and Oxidative Stress In Relation to Lifestyle and Disease Progression in Asthmatic Patients/ Evaluacija nivoa antioksidanasa i oksidativnog stresa u sistemu u odnosu na životni stil i progresiju bolesti kod obolelih od astme

    Directory of Open Access Journals (Sweden)

    Singh Yadav Abhay

    2016-01-01

    Full Text Available Uvod: Astma je hronično oboljenje disajnih puteva. Oksi- dativni stres čini važan deo u patogenezi astme. Ima pre­sudnu ulogu u pogoršanju bolesti i predstavlja važnu posle- dicu upale disajnih puteva.

  2. Study of the multipionic modes e+e-→π+π-π0 and e+e-→π+π-π+π- at the Orsay storage ring ACO

    International Nuclear Information System (INIS)

    Cordier, A.

    1978-03-01

    The results obtained with the magnetic detector DMI at the Orsay storage ring ACO are presented for the reactions e + e - →π + π - π 0 from 750 to 1100 MeV and e + e - →π + π - π + π - from 810 to 1100 MeV in the centre of mass. The magnetic detector DM1 consists of four cylindrical multiwire proportional chambers with anode and cathode readout in a solenoid providing a field of 0.9 T. The data for e + e - →π + π - π 0 show without ambiguity an interference effect between the ω and phi mesons, however new measurement above the phi performed using kinematical analysis can only be explained by higher energy contribution. In addition, the parameters of the ω have been obtained with improved accuracy compared to other experiments, and particularly the branching ratio Bsub(ω→e + e - )=(6.75+-0.69)10 -5 . The cross section of e + e - →π + π - π + π - is also measured and particularly an upper limit on the branching of phi→π + π - π + π - given [fr

  3. Tamponamento cardíaco como uma das primeiras manifestações do lúpus eritematoso sistêmico

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    Michelle keiko Molina

    2012-09-01

    Full Text Available O Lúpus Eritematoso Sistêmico (LES é uma doença autoimune de causa desconhecida que pode produzir apresentações clínicas variáveis, com períodos de remissões e de recaídas. O diagnóstico é confirmado pela presença de quatro dos onze critérios clínicos e/ou laboratoriais (erupção malar, erupção discoide, fotossensibilidade, úlceras da mucosa oral, artrite, serosite, distúrbio renal, distúrbio neurológico, distúrbio hematológico, distúrbio imunológico e anticorpo antinuclear. Dentre as manifestações cardiovasculares, o derrame pericárdico e a pericardite clínica são observados na maioria dos pacientes. Porém, o tamponamento cardíaco é raro como manifestação clínica.

  4. Mixoma cardíaco con diagnóstico prenatal: Presentación de un caso y revisión de literatura

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    Josías Ríos

    2012-10-01

    Full Text Available El mixoma es la tumoración cardíaca más frecuente en el adulto, constituyendo aproximadamente el 50% de las mismas. En la edad pediátrica el tumor cardíaco más frecuente es el rabdomioma, generalmente asociado a esclerosis tuberosa. La presentación del mixoma en pacientes pediátricos es muy rara y más aun en la etapa neonatal. Presentamos el caso de una paciente de sexo femenino que fue sometida a cirugía a los 8 días de nacida por presentar dos tumoraciones intracardiacas diagnosticadas en la etapa intrauterina a las 38 semanas de gestación. La cirugía se realizó mediante esternotomía media, con circulación extracorpórea y arresto circulatorio. Las tumoraciones, que eran de aspecto polipoide se localizaban en la aurícula derecha, los estudios de patología fueron compatibles con mixoma. La evolución postoperatoria fue satisfactoria y la paciente fue dada de alta a los 14 días después de la cirugía.

  5. Retransplante cardíaco em criança sem o uso de hemoderivados Heart retransplantation in children without the use of blood product

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    Antonio Alceu dos Santos

    2012-06-01

    Full Text Available Este artigo relata um caso de retransplante cardíaco sem o uso de hemoderivados, em uma criança de 6 anos, com miocardiopatia dilatada grave, após rejeição crônica do enxerto e refratária ao tratamento clínico. Para evitar transfusão sanguínea nessa cirurgia, foi realizado planejamento multidisciplinar, que envolveu o uso de eritropoietina no pré-operatório, hemodiluição normovolêmica aguda e recuperação de sangue autólogo no intraoperatório (cell saver, bem como hemostasia meticulosa e redução de flebotomias no pós-operatório.This article reports a case of a cardiac retransplantation without the use of blood products, in a 6 year old, with severe dilated cardiomyopathy after chronic graft rejection and refractory to clinical treatment. To avoid a blood transfusion in this surgery a multidisciplinary approach was planned, which involved the use of preoperative erythropoietin, acute normovolemic hemodilution and intraoperative cell savage with autologous blood recovery system, as well as a meticulous hemostasis and reduced postoperative phlebotomy.

  6. Experiência com transplante cardíaco heterotópico em pacientes com resistência pulmonar elevada: seguimento tardio Experiencia con trasplante cardíaco heterotópico en pacientes con resistencia pulmonar elevada: seguimiento tardío Experience with heterotopic heart transplantation in patients with elevated pulmonary vascular resistance: late follow-up

    Directory of Open Access Journals (Sweden)

    Jose Henrique Andrade Vila

    2010-02-01

    Full Text Available FUNDAMENTO: Nos últimos anos o numero de artigos sobre transplante cardíaco heterotópico tem sido escasso na literatura, inclusive internacional, e em particular do seguimento de longo prazo destes pacientes, o que levou ao presente relato. OBJETIVO: Relatar a experiência clínica inicial e evolução tardia de quatro pacientes submetidos a transplante cardíaco heterotópico, sua indicação e principais complicações. MÉTODOS: As cirurgias ocorreram entre 1992 e 2001, sendo que a indicação de transplante heterotópico, em todas, foi pela RVP, variável de 4,8UW a 6.5UW, com gradiente transpulmonar acima de 15mmHg. No 3º paciente, foi realizada uma anastomose direta entre as artérias pulmonares sem emprego de tubo protético e, no coração nativo, foi realizada uma valvoplastia mitral e aneurismectomia de ventrículo esquerdo (VE. O esquema imunossupressor imediato foi duplo com ciclosporina e azatioprina nos três primeiros pacientes e ciclosporina e micofenolato mofetil no 4º paciente. RESULTADOS: Um óbito imediato por falência do enxerto, um óbito após dois anos e meio por endocardite em trombo intraventricular no coração nativo, e um terceiro óbito seis anos após o transplante, por complicações pós-operatórias de cirurgia na valva aórtica do coração nativo. O remanescente, 15 anos após o transplante, encontra-se bem, em classe funcional II (NYHA, seis anos após a oclusão cirúrgica da valva aórtica do coração nativo. CONCLUSÃO: O transplante cardíaco heterotópico é um procedimento com resultado inferior ao transplante cardíaco ortotópico, por apresentarem maior RVP. Os trombos intraventriculares no coração nativo, que exigem anticoagulação prolongada, bem como as complicações de válvula aórtica, também no coração nativo, podem exigir tratamento cirúrgico. Entretanto, em um paciente, a sobrevida de 15 anos mostrou a eficácia de longo prazo desse tipo de alternativa, para pacientes

  7. Znaczenie edukacji w terapii pacjentów z astmą oskrzelową = Importance of education in treatment of patients with asthma

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    Iwona Czerwińska Pawluk

    2015-01-01

      Streszczenie   Edukacja pacjentów z astmą jest jednym z elementów warunkujących osiąganie celów leczenia, a w konsekwencji poprawia jakość życia chorych. Pośród wielu czynników warunkujących skuteczność edukacji prowadzonej wobec pacjentów z chorobą przewlekłą i / lub ich opiekunów na szczególną uwagę zasługują: partnerskie relacje między lekarzem a pacjentem/ jego opiekunem, dostosowanie zakresu wiedzy w zależności do wieku, poziomu wykształcenia oraz oczekiwań pacjentów/ opiekunów.  Istotna też jest ciągłość kształcenia, mająca na celu weryfikację zdobytej wiedzy  i nabytych umiejętności.  Chory na astmę musi zaakceptować chorobę i z pełnym przekonaniem podjąć zadanie współuczestnictwa w jej leczeniu. Edukacja jest podstawą interakcji między pracownikami opieki zdrowotnej a pacjentem. Może mieć charakter edukacji bezpośredniej,  szkoleń w małych grupach, seminariów, sympozjów, konferencji, dystrybucji materiałów edukacyjnych, kampanii medialnych,  portali internetowych.   Abstract   Education of patients with asthma is one of the prerequisites for achieving the goals of treatment and consequently improves the quality of life of patients. Among the many factors determining the effectiveness of education provided to patients with chronic disease and / or their carers deserve special attention: partnerships between doctor and patient / his guardian, adjust the scope of knowledge according to age, educational level and expectations of patients / caregivers. Also important is the continuity of education, in order to verify their knowledge and acquired skills. Suffering from asthma must accept the disease and confidently take on the task of participation in its treatment. Education is the basis of the interaction between health care professionals and patients. It may be of direct education, training in small groups, seminars, symposia, conferences, distribution of educational materials, media

  8. Reprodutibilidade do teste de caminhada de 6 minutos e marcadores autonômicos cardíacos em idosas ativas e sedentárias

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    André Igor Fonteles

    2016-07-01

    Full Text Available DOI: http://dx.doi.org/10.5007/1980-0037.2016v18n3p287   Objetivou-se verificar a reprodutibilidade do teste de caminhada de 6 minutos (TC6 e de marcadores autonômicos cardíacos pós-esforço em idosas fisicamente ativas e sedentárias. Dezoito idosas ativas (64,2 ± 3,1 anos; 63,0 ± 2,7 kg; 1,52 ± 0,06 m; 26,9 ± 2,7 kg.m-2 praticantes de Tai Chi Chuan (≥6 meses de prática e 18 idosas sedentárias (64,0 ± 3,7 anos; 63,8 ± 8,9 kg; 1,49 ± 0,05 m; 28,4 ± 3,5 kg.m-2 foram submetidas a dois TC6 com uma semana de intervalo. Foram medidas a frequência cardíaca de recuperação (FCR de um e dois minutos (FCR1’ e FCR2’, respectivamente e variabilidade da frequência cardíaca (VFC pós-esforço. A reprodutibilidade foi verificada pelos: coeficiente de correlação intraclasse (CCI com 95% de intervalo de confiança; análise de concordância de Bland-Altman; e coeficiente de variação (CV. O desempenho no TC6 (528,8±71,4 m e 473,2±62,4 m; CV=7,9% e CV=8,5% apresentou alta reprodutibilidade (CCI=0,86 em idosas ativas e sedentárias, respectivamente. Similarmente, as medidas pós-esforço da FCR1’ (29,0±11,0 bpm e 17,0±8,0 bpm; CV=30,1% e CV=40,2% e FCR2’ (36,0±10,0 bpm e 24,0±9,0 bpm; CV=23,7% e CV=22,8% apresentaram alta reprodutibilidade (CCI≥0,84 e CCI≥0,80 em ambos os grupos. Quanto a VFC verificou-se reprodutibilidade moderada (CCI≥0,57; CV=35-47% em idosas ativas e moderada-alta nas sedentárias (CCI=0,65-0,76; CV=34-69%. Todas as variáveis apresentaram concordância em ambos os grupos. Conclui-se que o TC6, FCR e VFC pós-esforço são instrumentos reprodutíveis na avaliação da capacidade funcional e controle autonômico cardíaco em idosas ativas e sedentárias.

  9. Mixomas cardíacos: análisis estadístico de 20 años Cardiac myxomas: a 20 years-statistical analysis

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    Alejandro Villar Inclán

    2009-12-01

    Full Text Available INTRODUCCIÓN. Los tumores primarios del corazón pueden ser malignos o benignos, mientras que los tumores secundarios son siempre metastásicos. El 75 % de los tumores primarios son benignos y de localización endocavitaria, la mayoría es del tipo mixoma, sobre todo en los adultos. MÉTODOS. De un total de 2925 pacientes operados con circulación extracorpórea entre enero de 1986 y enero del 2006 en el Hospital «Hermanos Ameijeiras», se seleccionaron 30 expedientes clínicos de pacientes con diagnóstico histopatológico de mixoma cardíaco. Para el análisis de los resultados se aplicaron cálculos de incidencia. A las variables se aplicaron porcentajes, medias y desviación estándar. RESULTADOS. Diecinueve pacientes fueron del sexo femenino y 11 del masculino, con rango de edad entre 15 y 66 años (media, 44 años. Los elementos clínicos desde el punto de vista semiológico fueron muy variados, y predominaron las palpitaciones y la disnea en el 83 % y 73 % de los pacientes, respectivamente. El intervalo de aparición de los síntomas fue desde 1 mes hasta 92 meses (media, 15 meses. El ecocardiograma confirmó el 100 % del diagnóstico en los pacientes. La localización más frecuente de los mixomas fue la aurícula izquierda (80 % de los casos. A todos los pacientes se les practicó la exéresis del tumor y su base de implantación. La mortalidad observada fue del 6,6 %. CONCLUSIONES. La incidencia de esta enfermedad fue del 1,2 % de todos los pacientes operados en este tiempo. La proporción sexo femenino-masculino fue de 2:1. El ecocardiograma constituye la piedra angular del diagnóstico positivo de los mixomas cardíacos. La mortalidad en la serie estuvo dentro de los rangos documentados en la literatura médica internacional.INTRODUCTION: Heart primary tumors may be maligns or benigns, whereas the secondary tumors always are of metastatic origin. The 75% of primary tumors are benigns and of a endocavitary localization, most are of

  10. Taponamiento cardíaco secundario a carcinoma papilar esclerosante difuso de tiroides Metastatic cardiac tamponade as initial manifestation of papillary thyroid carcinoma

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    Verónica Riva

    2011-12-01

    Full Text Available El carcinoma papilar, variante esclerosante difusa, corresponde al 2% de todos los carcinomas papilares de la tiroides. Se caracteriza por comprometer de manera difusa y bilateral a la glándula tiroides. Clínicamente se manifiesta con metástasis ganglionares y pulmonares, afectando predominantemente a mujeres jóvenes. Se describe un caso de taponamiento cardíaco como presentación inicial de un carcinoma papilar de tiroides variante esclerosante difusa. Una mujer de 32 años concurrió al servicio de emergencias médicas refiriendo epigastralgia y tos seca. Durante el examen físico se constató hipotensión arterial, taquicardia y ruidos cardíacos disminuidos. Se realizó un ecocardiograma, observándose derrame pericárdico. Por medio de una pericardiocentesis se obtuvo líquido pericárdico, cuyo análisis mostró células neoplásicas. Durante la evolución la paciente presentó recurrencia del derrame pericárdico por lo que se realizó una ventana pleuropericárdica, detectándose durante la cirugía una lesión nodular subpleural, la cual fue biopsiada e informada posteriormente como una metástasis de carcinoma papilar vinculable a origen tiroideo. Se realizó una tiroidectomía total con linfadenectomía cervical bilateral. El diagnóstico final fue carcinoma papilar, variante esclerosante difusa. Esta variante infiltra el tejido conectivo de los espacios interfoliculares, simulando una tiroiditis y se caracteriza por una permeación vascular temprana. En oposición a la variante clásica, la esclerosante difusa presenta mayor agresividad y mayor tasa de recurrencia. El carcinoma papilar de tiroides debe tenerse presente como diagnóstico diferencial en nuestro medio, en todas aquellas lesiones neoplásicas papilares metastásicas, más aún si se trata de mujeres jóvenes.Papillary carcinoma, diffuse sclerosing variant corresponds to 2% of all papillary thyroid carcinomas. It is usually diffuse and bilateral, affecting the entire

  11. Changes of the mechanical properties of ASTM A 533 type B class 1 (JRQ) steel used in pressure vessels of nuclear power plants

    International Nuclear Information System (INIS)

    Balderrama, Juan J.; Iorio, Antonio F.

    1999-01-01

    The steels used in pressure vessels generally present a non-homogenous microstructure across the thickness of their walls due to their manufacturing process. Average thickness being between 200-250 mm also makes the problem more serious. These facts lead us to think that the variation affects not only microstructure, but also mechanical properties. For this reason the methodology for the evaluation of materials should be standardized for their use before and after radiation by means of a surveillance program which allows us to verify the conditions of the steel of the pressure vessel by using Charpy-v, tensile and fracto-mechanics specimens inside the reactor to obtain information about the condition of the pressure vessel material. In order to analyze these changes, tests were carried out using Charpy-v specimens with different orientation inside the block representing the wall thickness and the corresponding ductile-to-brittle transition curves were made for each direction. The orientations to be considered will be four in all and will be those called TL, LT, ST and LS by ASTM E 399 (1993). The conclusions reached arise from a comparative analysis of the results obtained for each orientation under study and confirm the recommendation by Standards regarding the selection of the TL orientation as the most conservative. (author)

  12. The Effects of Sn Addition on the Microstructure and Surface Properties of Laser Deposited Al-Si-Sn Coatings on ASTM A29 Steel

    Science.gov (United States)

    Fatoba, Olawale S.; Akinlabi, Stephen A.; Akinlabi, Esther T.

    2018-03-01

    Aluminium and its alloys have been successful metal materials used for many applications like commodity roles, automotive and vital structural components in aircrafts. A substantial portion of Al-Fe-Si alloy is also used for manufacturing the packaging foils and sheets for common heat exchanger applications. The present research was aimed at studying the morphology and surface analyses of laser deposited Al-Sn-Si coatings on ASTM A29 steel. These Fe-intermetallic compounds influence the material properties during rapid cooling by laser alloying technique and play a crucial role for the material quality. Thus, it is of considerable technological interest to control the morphology and distribution of these phases in order to eliminate the negative effects on microstructure. A 3 kW continuous wave ytterbium laser system (YLS) attached to a KUKA robot which controls the movement of the alloying process was utilized for the fabrication of the coatings at optimum laser parameters. The fabricated coatings were investigated for its hardness and wear resistance performance. The field emission scanning electron microscope equipped with energy dispersive spectroscopy (SEM/EDS) was used to study the morphology of the fabricated coatings and X-ray diffractometer (XRD) for the identification of the phases present in the coatings. The coatings were free of cracks and pores with homogeneous and refined microstructures. The enhanced hardness and wear resistance performance were attributed to metastable intermetallic compounds formed.

  13. Disinfectant wipes are appropriate to control microbial bioburden from surfaces: use of a new ASTM standard test protocol to demonstrate efficacy.

    Science.gov (United States)

    Sattar, S A; Bradley, C; Kibbee, R; Wesgate, R; Wilkinson, M A C; Sharpe, T; Maillard, J-Y

    2015-12-01

    The use of disinfectant pre-soaked wipes (DPW) to decontaminate high-touch environmental surfaces (HTES) by wiping is becoming increasingly widespread in the healthcare environment. However, DPW are rarely tested using conditions simulating their field use, and the label claims of environmental surface disinfectants seldom include wiping action. To evaluate the new E2967-15 standard test specific to wipes, particularly their ability to decontaminate surfaces and to transfer acquired contamination to clean surfaces. ASTM Standard E2967-15 was used by three independent laboratories to test the efficacy of five types of commercially available wipe products. All data generated were pulled together, and reproducibility and repeatability of the standard were measured. All the commercial DPW tested achieved a >4log10 (>99.99%) reduction in colony-forming units (CFU) of Staphylococcus aureus and Acinetobacter baumanii with 10s of wiping, but only one DPW containing 0.5% accelerated H2O2 prevented the transfer of bacteria to another surface. This newly introduced standard method represents a significant advance in assessing DPW for microbial decontamination of HTES, and should greatly assist research and development, and in making more relevant and reliable claims on marketed DPW. Copyright © 2015. Published by Elsevier Ltd.

  14. Analytical modeling of the thermomechanical behavior of ASTM F-1586 high nitrogen austenitic stainless steel used as a biomaterial under multipass deformation.

    Science.gov (United States)

    Bernardes, Fabiano R; Rodrigues, Samuel F; Silva, Eden S; Reis, Gedeon S; Silva, Mariana B R; Junior, Alberto M J; Balancin, Oscar

    2015-06-01

    Precipitation-recrystallization interactions in ASTM F-1586 austenitic stainless steel were studied by means of hot torsion tests with multipass deformation under continuous cooling, simulating an industrial laminating process. Samples were deformed at 0.2 and 0.3 at a strain rate of 1.0s(-1), in a temperature range of 900 to 1200°C and interpass times varying from 5 to 80s. The tests indicate that the stress level depends on deformation temperature and the slope of the equivalent mean stress (EMS) vs. 1/T presents two distinct behaviors, with a transition at around 1100°C, the non-recrystallization temperature (Tnr). Below the Tnr, strain-induced precipitation of Z-phase (NbCrN) occurs in short interpass times (tpass<30s), inhibiting recrystallization and promoting stepwise stress build-up with strong recovery, which is responsible for increasing the Tnr. At interpass times longer than 30s, the coalescence and dissolution of precipitates promote a decrease in the Tnr and favor the formation of recrystallized grains. Based on this evidence, the physical simulation of controlled processing allows for a domain refined grain with better mechanical properties. Copyright © 2015 Elsevier B.V. All rights reserved.

  15. Determination of the sensitization of two coatings by steel welding 308l by the EPR-Dl and Astm A-262 practice A techniques

    International Nuclear Information System (INIS)

    Arganis J, C. R.; Zenteno S, J. C.; Robles F, J. L.; Rodriguez M, E.; Vazquez P, A.

    2014-10-01

    A stainless steel 308l coating was deposited by the shielded metal arc welding (SMAW) on steel A36 with a thickness of 4.726 mm in three layers. The sensitization was measured with the technique of Electrochemical Potentiodynamic Reactivation of Double-loop (EPR-Dl), using a portable cell and other of conventional window. The standard Astm A-262, practice A was used to verify the sensitization values. Two samples were used, a welding on a plate of 323 x 172 x 76.2 mm and the second welding on the end of a plate of 12.7 mm of thickness and 280 mm of longitude, with a post-welding process with gas tungsten arc welding (GTAW) with electrode ERNiCr 3 and a process SMAW with electrode ENICRFe 3 . The coating on the plate showed low values of sensitization grade (DOS) in all the points, indicating a very quick heat extraction and an inter dendritic structure type step. The second sample presented DOS values that are related with a structure of low sensitization and the influence of the heat of the post-welding process and a structure of recrystallized grains. (Author)

  16. Determinación de las causas de falla en la ZAC de un acero ASTM A36 soldado por proceso SMAW

    Directory of Open Access Journals (Sweden)

    Mónica Isabel Melgarejo Rincón

    2013-07-01

    Full Text Available En este trabajo se presenta el estudio de una junta de acero ASTM A36 utilizado para el transporte de hidrocarburos y unido por el proceso de soldadura SMAW. Para la detección de discontinuidades en el cordón de soldadura y evaluación del grado de afectación del material próximo a la soldadura y su incidencia en la aparición de discontinuidades se utilizó la técnica de ultrasonido Phased Array. Las soldaduras fueron aplicadas siguiendo los parámetros establecidos en WPS. La zona de análisis se caracterizó mediante microscopia óptica y microscopía electrónica de barrido con el fin de determinar cambios microestructurales que incidan en la formación de la discontinuidad encontrada. Las propiedades mecánicas fueron evaluadas mediante un ensayo de dureza Rockvell C. El estudio demuestra cambios microestructurales del material base debidos a la elevación de temperaturas por encima del límite aconsejado por códigos, lo cual trae como consecuencia la formación de una discontinuidad lineal.

  17. Stress corrosion (Astm G30-90 standard) in 08x18H10T stainless steel of nuclear fuel storage pool in WWER reactors; Corrosion bajo esfuerzo (Norma ASTM G30-90) en acero inoxidable 08x18H10T de piscinas de almacenamiento de combustible nuclear en reactores V.V.E.R

    Energy Technology Data Exchange (ETDEWEB)

    Herrera, V.; Zamora R, L. [Centro de Estudios Aplicados al Desarrollo Nuclear (Cuba)

    1997-07-01

    At the water storage of the irradiated nuclear fuel has been an important factor in its management. The actual pools have its walls covered with inoxidable steel and heat exchangers to dissipate the residual heat from fuel. It is essential to control the water purity to eliminate those conditions which aid to the corrosion process in fuel and at related components. The steel used in this research was obtained from an austenitic inoxidizable steel standardized with titanium 08x18H10T (Type 321) similar to one of the two steel coatings used to cover walls and the pools floor. the test consisted in the specimen deformation through an U ply according to the Astm G30-90 standard. The exposition of the deformed specimen it was realized in simulated conditions to the chemical regime used in pools. (Author)

  18. Avaliação das propriedades termo-mecânicas de borracha nitrílica após ensaio de compatibilidade de acordo com ASTM D 3455 Thermal-mechanical properties evaluation of nitrilic rubber after compatibility test according to ASTM D 3455

    Directory of Open Access Journals (Sweden)

    Adailze L. Meyer

    2006-01-01

    Full Text Available O copolímero butadieno - acrilonitrila - NBR é comumente aplicado na confecção de gaxetas e anéis de vedação para transformadores elétricos isolados a óleo mineral. Durante o uso esses materiais permanecem em contato com óleo em temperaturas próximas a 90 ºC provocando alterações físicas e químicas no material elastomérico e no óleo. Neste trabalho, estudou-se a variação das propriedades mecânicas do elastômero resultantes do ensaio de compatibilidade (ASTM D 3455[3]. A caracterização mecânica foi realizada por ensaios de resistência a tração, dureza e análise dinâmico-mecânica (DMA. A verificação da estabilidade térmica e a composição do NBR foram obtidas através de análise termogravimétrica (TGA.The copolymer of acrylonitrile and butadiene - NBR is commonly used to manufacture gaskets and seals to be used in electrical transformers insulated by mineral oil. During operation those materials are constantly in contact with oil at temperatures that can reach 90 ºC, causing physical and chemicals changes in both gaskets and oil. In this paper the changes in elastomer mechanical properties after the compatibility test were studied (ASTM D 3455[3]. This characterization was done by tension properties, hardness and dynamical mechanical analysis (DMA. The evaluation of thermal stability and composition of the NBR was carried out through thermogravimetry analysis (TG.

  19. Treinamento físico de natação promove remodelamento cardíaco e melhora a perfusão sanguínea no músculo cardíaco de SHR via mecanismo dependente de adenosina

    Directory of Open Access Journals (Sweden)

    Juliana Gonçalves de Barros

    2011-06-01

    Full Text Available INTRODUÇÃO: Exercícios físicos são utilizados como terapia não farmacológica para o tratamento da hipertensão arterial, e o treinamento físico (TF por natação é reconhecido por produzir remodelamento cardíaco em animais experimentais. Entretanto, a ação vasodilatadora da adenosina (ado resultante do exercício físico como prevenção e tratamento da hipertensão é pouco explorada. OBJETIVO: Avaliar o remodelamento cardíaco e o papel da adenosina na distribuição do fluxo sanguíneo para o miocárdio após treinamento físico em SHR. Método: 28 SHR machos babies e adultos foram submetidos ao TF aeróbio de natação, durante 10 semanas (5x/sem -1h/dia. Foram utilizados protocolos de microesferas coloridas para avaliar fluxo sanguíneo, técnicas de morfologia para avaliar hipertrofia cardíaca e análises bioquímicas para verificar atividade de enzimas envolvidas na formação de adenosina. RESULTADOS: TF por natação atenuou a evolução da HA em SHR babies (S: 145 ± 2; T: 140 ± 2mmHg, promoveu bradicardia de repouso em SHR adultos (S: 340 ± 4; T: 321 ± 6bpm e desenvolveu HC nos dois grupos (TB: 12%; TA: 10%. Na condição basal, o TF aumentou o FS coronário em SHR babies (S: 4.745 ± 2.145; T: 6.970 ± 2.374mi/coração e maior resposta vasodilatadora à infusão de adenosina foi observada (S: 18.946 ± 6.685; T: 25.045 ± 7.031mi/coração. Neste grupo, o TF promoveu maior atividade da enzima 5'-nucleotidase, levando à maior formação de adenosina (S: 0,45 ± 0,09; T: 1,01 ± 0,05. CONCLUSÃO: O TF de natação, além de desenvolver HC e apresentar maior hidrólise de AMP, promoveu aumento no FS coronário, sendo mostrado que desempenha um importante papel na regulação da hipertensão

  20. Correção simultânea de defeito congênito intracardíaco e pectus excavatum Simultaneous repair of congenital heart defect and pectus excavatum

    Directory of Open Access Journals (Sweden)

    João Roberto Breda

    2007-09-01

    Full Text Available Relatamos tratamento simultâneo de pectus excavatum e defeito congênito intracardíaco representado por comunicação interatrial ostium secundum. Paciente do sexo masculino, 8 anos de idade, com diagnóstico clínico e ecocardiográfico de comunicação interatrial, associada à deformidade da parede torácica tipo pectus excavatum. Foi encaminhado para operação com correção simultânea do defeito congênito intracardíaco associado ao reparo do pectus. O tratamento operatório simultâneo do pectus excavatum e defeitos congênitos intracardíacos torna difícil o acesso ao coração. Foi feita a correção simultânea dessas alterações, com satisfatório resultado, sobretudo estético, para o paciente.The author describes the simultaneous treatment of pectus excavatum and congenital intracardiac defect (atrial septal defect represented by the interatrial foramen secundum. An 8-year-old boy, with clinical and echocardiography diagnosis of atrial septal defect associated with pectus excavatum was referred to a simultaneous surgical treatment of both abnormalities. The simultaneous surgical treatment of both pectus excavatum and congenital intracardiac defects make it difficult to access the heart. In this case, the simultaneous surgical treatment of atrial septal defect and pectus excavatum was a valuable alternative to surgical repair of both abnormalities, mainly due to its cosmetic outcome.

  1. Grado de información, acceso y prácticasde elaboración de alimentos sin TACC de beneficios del programa de Asistencia Alimentaria para Celíacos de General Madariaga

    OpenAIRE

    Chaparro, María Victoria

    2015-01-01

    La Enfermedad Celíaca, también conocida como esprúe celíaco o enteropatía sensible al gluten, se la define como la intolerancia alimentaria de orden genético más frecuente de la especie humana. El único tratamiento es una dieta estricta y de por vida Sin TACC. La incidencia es mayor en mujeres, que en varones, siendo su prevalencia aproximadamente el 1% de la población. Objetivos: Determinar el grado de información, el acceso y las prácticas de elaboración de alimentos Sin T...

  2. 150. ¿Tres en uno? Implante de tres dispositivos de asistencia circulatoria a un mismo paciente como terapia pre y postrasplante cardíaco. A propósito de un caso

    Directory of Open Access Journals (Sweden)

    J.A. Fernández-Divar

    2012-04-01

    Conclusiones: El implante ECMO es rápido y seguro, y permite mantener con vida a pacientes en shock cardiogénico grave. La reconversión a asistencias de media duración nos ayuda a mejorar el estado del paciente y que éste llegue al trasplante cardíaco en mejores condiciones. La incorporación de asistencias en pacientes con fallo primario del injerto (FPI tras el trasplante supone un avance en el tratamiento de esta patología.

  3. Análisis acústico sobre señales de auscultación digital para la detección de soplos cardíacos

    OpenAIRE

    CASTAÑO, ANDRÉS M.; DELGADO T., EDILSON; GODINO, JUANI; CASTELLANOS, GERMÁN

    2009-01-01

    Se presenta la metodología basada en el análisis acústico de señales fonocardiográficas (FCG) par a detectar soplos cardíacos. En primer lugar se desarrolla un sistema de filtración basado en la transformada wavelet para reducir las perturbaciones que usualmente se presentan en la etapa de adquisición, ajustando la calidad del sonido de acuerdo a los requerimientos clínicos y validados por especialistas en semiología. Se propone un algoritmo de segmentación basado en la energía promedio norm...

  4. Estudo anatômico dos gânglios celíaco, celiacomesentérico e mesentérico cranial e de suas conexões no gato doméstico (Felix domestica, Linnaeus, 1758

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    Antonio Augusto Coppi Maciel Ribeiro

    2000-01-01

    Full Text Available O gânglio celíaco é um dos principais responsáveis pela inervação do estômago, intestinos, fígado, pâncreas e ainda contribui para a inervação do baço, sendo desta forma essencial ao controle da motilidade gastrointestinal. O conhecimento do suprimento nervoso endereçado a estes órgãos é fundamental na clínica médica e cirúrgica no tocante às atonias digestivas, gastroenterites hemorrágicas, torções gástricas e invaginações intestinais. Neste trabalho, estudou-se a anatomia macro e microscópica dos gânglios celíaco, celiacomesentérico e mesentérico cranial. Foram utilizados trinta gatos domésticos, adultos, 10 machos e 20 fêmeas. A aorta torácica desses gatos foi injetada com solução de Neoprene látex 650 corada, sendo os animais congelados por no mínimo 48 horas. A fixação foi feita posteriormente com solução aquosa de formol a 10%. Nos estudos microscópicos, utilizaram-se as seguintes colorações: hematoxilina-eosina, tricrômico de Masson, reticulina e hematoxilina ácida fosfotúngstica. O gânglio celíaco ocorreu 7 vezes, sendo 4 direitos e 3 esquerdos, predominando a forma elíptica (23,3% e a situação periarterial. Os gânglios celiacomesentéricos foram contados em número de 24, sendo 11 independentes; 2 apresentando as porções direita e esquerda e 11 gânglios celiacomesentéricos direitos com uma porção mesentérica cranial esquerda, tendo formato semilunar assimétrico. Esses achados sugerem o predomínio da fusão do gânglio celíaco ao mesentérico cranial, constituindo assim o gânglio celiacomesentérico. Este é formado por neurônios imersos em abundante matriz conjuntiva fibrosa, envoltos por uma cápsula contendo fibras elásticas, colágenas e reticulares, apresentando uma continuidade nos pontos de fusão ganglionar.

  5. Equilibrios ácido-base. Aspectos teóricos. ¿Es posible la neutralización cuantitativa de dos protolitos débiles? Estudio del caso ácido bórico-amoníaco.

    OpenAIRE

    Milla González, Miguel

    2016-01-01

    Mediante la combinación de los balances de masa y las constantes de equilibrio del sistema, se encuentra la función y=f(x) [y = cantidad valorada del ácido débil y x la cantidad añadida de la base débil]. Se representa dicha función y se calcula su límite cuando x tiende a infinito para comprobar que no es posible la valoración (neutralización cuantitativa) del ácido bórico con la base amoníaco.

  6. ASTM F739 method for testing the permeation resistance of protective clothing materials: critical analysis with proposed changes in procedure and test-cell design.

    Science.gov (United States)

    Anna, D H; Zellers, E T; Sulewski, R

    1998-08-01

    ASTM (American Society for Testing and Materials) Method F739-96 specifies a test-cell design and procedures for measuring the permeation resistance of chemical protective clothing. Among the specifications are open-loop collection stream flow rates of 0.050 to 0.150 L/min for a gaseous medium. At elevated temperatures the test must be maintained within 1 degree C of the set point. This article presents a critical analysis of the effect of the collection stream flow rate on the measured permeation rate and on the temperature uniformity within the test cell. Permeation tests were conducted on four polymeric glove materials with 44 solvents at 25 degrees C. Flow rates > 0.5 L/min were necessary to obtain accurate steady-state permeation rate (SSPR) values in 25 percent of the tests. At the lower flow rates the true SSPR typically was underestimated by a factor of two or less, but errors of up to 33-fold were observed. No clear relationship could be established between the need for a higher collection stream flow rate and either the vapor pressure or the permeation rate of the solvent, but test results suggest that poor mixing within the collection chamber was a contributing factor. Temperature gradients between the challenge and collection chambers and between the bottom and the top of the collection chamber increased with the water-bath temperature and the collection stream flow rate. Use of a test cell modified to permit deeper submersion reduced the gradients to < or = 0.5 degrees C. It is recommended that all SSPR measurements include verification of the adequacy of the collection stream flow rate. For testing at nonambient temperatures, the modified test cell described here could be used to ensure temperature uniformity throughout the cell.

  7. Laboratory Study on Prevention of CaO-Containing ASTM "D-Type" Inclusions in Al-Deoxidized Low-Oxygen Steel Melts During Basic Slag Refining

    Science.gov (United States)

    Jiang, Min; Wang, Xin-Hua; Yang, Die; Lei, Shao-Long; Wang, Kun-Peng

    2015-12-01

    Present work was attempted to explore the possibility of preventing CaO-containing inclusions in Al-deoxidized low-oxygen special steel during basic slag refining, which were known as ASTM D-type inclusions. Based on the analysis on formation thermodynamics of CaO-containing inclusions, a series of laboratory experiments were designed and carried out in a vacuum induction furnace. During the experiments, slag/steel reaction equilibrium was intentionally suppressed with the aim to decrease the CaO contents in inclusions, which is different from ordinary concept that slag/steel reaction should be promoted for better control of inclusions. The obtained results showed that high cleanliness of steel was obtained in all the steel melts, with total oxygen contents varied between 0.0003 and 0.0010 pct. Simultaneously, formation of CaO-containing inclusions was successfully prohibited, and all the formed oxide inclusions were MgO-Al2O3 or/and Al2O3 in very small sizes of about 1 to 3 μm. And 90 pct to nearly 98 pct of them were wrapped by relative thicker MnS outer surface layers to produce dual-phased "(MgO-Al2O3) + MnS" or "Al2O3 + MnS" complex inclusions. Because of much better ductility of MnS, certain deformability of these complex inclusions can be expected which is helpful to improve fatigue resistance property of steel. Only very limited number of singular MnS inclusions were with sizes larger than 13 μm, which were formed during solidification because of. In the end, formation of oxide inclusions in steel was qualitatively evaluated and discussed.

  8. Débito cardíaco diminuído: revisão sistemática das características definidoras Débito cardíaco disminuído: revisión sistemática de las características definidoras Decreased cardiac output: a systematic review of the defining characteristics

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    Vanessa de Souza

    2011-01-01

    Full Text Available OBJETIVOS: Caracterizar os artrigos científicos relacionados ao diagnóstico de enfermagem débito cardíaco diminuído. Verificar os artigos que descrevem o comportamento das características definidoras deste diagnóstico, identificando aquelas que ocorrem com maior frequência. MÉTODOS: Trata-se de uma revisão sistemática realizada nas bases de dados: Lilacs, SciELO, Embase, Medline, Pubmed e Cochrane, no período de 1985 a 2008. RESULTADOS: Foram selecionados 13 artigos, identificando 50 características definidoras, sendo dez com maior frequência: alteração da frequência/ritmo cardíaco, dispneia, labilidade da pressão arterial, estertores, oligúria anúria, edema, pele fria, fadiga/fraqueza, diminuição dos pulsos periféricos e diminuição da perfusão periférica. CONCLUSÃO: A temática vem sendo pouco explorada. Constatou-se a importância do exame físico, a utilização de técnicas menos invasivas e a necessidade de rever as características definidoras propostas a fim de proporcionar clareza e objetividade na identificação desse diagnóstico de enfermagemOBJETIVOS: Caracterizar los artículos científicos relacionados al diagnóstico de enfermería débito cardíaco disminuído. Verificar los artículos que describen el comportamiento de las características definidoras de este diagnóstico, identificando aquellas que ocurren con mayor frecuencia. MÉTODOS: Se trata de una revisión sistemática realizada en las bases de datos: Lilacs, SciELO, Embase, Medline, Pubmed y Cochrane, en el período de 1985 al 2008. RESULTADOS: Fueron seleccionados 13 artículos, identificando 50 características definidoras, siendo diez con mayor frecuencia: alteración de la frecuencia/ritmo cardíaco, disnea, labilidad de la presión arterial, estertores, oliguria anuria, edema, piel fría, fatiga/debilidad, disminución de los pulsos periféricos y disminución de la perfusión periférica. CONCLUSIÓN: La temática viene siendo poco

  9. Osteoma osteoide no osso ilíaco: relato de dois casos Osteoid osteoma in the iliac bone: report on two cases

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    Elmano de Araújo Loures

    2012-04-01

    Full Text Available O osteoma osteoide é um tumor benigno do osso que se apresenta geralmente com dor noturna em adultos jovens, aliviada por repouso e salicilatos. Pode acometer qualquer osso, mas sua ocorrência no ilíaco é infrequente. Os autores descrevem dois casos de osteoma osteoide intramedular, localizado junto à articulação sacroilíaca, com sintomas que simulavam dor ciática e cujo diagnóstico se deu de forma tardia, apesar de o exame radiológico inicial mostrar lesão esclerótica em ambos os casos. O diagnóstico foi ratificado por tomografia computadorizada e o tratamento proposto foi a ressecção em bloco da lesão, com excisão do nidus. O diagnóstico definitivo foi confirmado pelo exame histopatológico. No seguimento de longo prazo, ambos estão assintomáticos e observou-se completa remodelação óssea no sítio cirúrgico. Os autores enfatizam as características típicas do tumor, a localização não usual, o diagnóstico diferencial e o tratamento.Osteoid osteoma is a benign bone tumor that generally presents with nighttime pain among young adults and is relieved by rest and salicylates. It can affect any bone, but occurrences in the iliac are unusual. The authors describe two cases of intramedullary osteoid osteoma next to the sacroiliac joint, with symptoms that simulated sciatic pain. The cases were diagnosed late, although the initial radiographs showed sclerotic lesions in both cases. The diagnosis was confirmed by means of CT scan and the nidus was excised surgically through en bloc resection. The definitive diagnosis was given by means of histopathological examination. Over long-term follow-up, both cases remained asymptomatic and complete bone remodeling at the surgical site was observed. The authors highlight the typical characteristics of the tumor, the unusual location, the differential diagnosis and the treatment.

  10. Ecocardiografia por Doppler tecidual no diagnóstico de rejeição após transplante cardíaco

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    Marcos Valério Coimbra Resende

    2011-07-01

    Full Text Available FUNDAMENTO: A biópsia endomiocárdica (BEM é o método padrão-ouro para o diagnóstico de rejeição celular (RC após transplante cardíaco (TC. OBJETIVO: Testar a hipótese de que o exame de imagem por Doppler tecidual (IDT pode detectar RC > 3A e agregar informação diagnóstica, comparado ao Doppler convencional. MÉTODOS: Cinquenta e quatro pacientes com TC foram submetidos à BEM e estudo ecocardiográfico através de IDT em até 24 horas. Comparamos os pacientes com TC e RC > 3A com pacientes com TC e RC 3A em 39/129 (30,2% das BEM. O melhor preditor isolado para o diagnóstico de RC foi a a'LAT, com sensibilidade de 76,3%, especificidade de 73,8% (p = 0,001. Na análise multivariada, a a'LAT (p = 0,001, a'SEP (p = 0,002, relação e'/a' LAT (p = 0,006, relação e'Mitral/ e'LAT (p = 0,014, SINF (p = 0,009 foram preditores de RC > 3A. Obtivemos um escore com sensibilidade de 88,2%, acurácia de 79,6%, e valor preditivo negativo de 92,9% para diagnosticar RC > 3A. O Doppler convencional (fluxo mitral e pulmonar venoso não foi relevante para predizer a RC > 3A. CONCLUSÃO: O estudo de IDT agregou informação diagnóstica para predizer RC > 3A quando comparado ao Doppler convencional. O modelo baseado em IDT pode ser tornar um método em potencial para detectar RC > 3A após TC.

  11. Caracterización de los síntomas de angina en hombres adultos con cateterismo cardíaco positivo para enfermedad coronaria

    Directory of Open Access Journals (Sweden)

    Clemencia Bernal

    2013-06-01

    Full Text Available Introducción: en Colombia la enfermedad coronaria ocasionó 29.394 muertes en 2011 ocupando el primer lugar como causa de mortalidad, según el Departamento Nacional de Estadística. Es importante disminuir el tiempo entre el inicio de los síntomas y el tratamiento, etapa en que la sintomatología, la interpretación y la manifestación del paciente son esenciales, así como su reconocimiento por parte del personal de salud para la definición oportuna del tratamiento. Objetivo: describir los síntomas de angina de un grupo de hombres con edades entre 40 y 80 años, con cateterismo cardíaco positivo para enfermedad coronaria en el marco de la teoría de Elizabeth Lenz según factores determinantes, dimensiones y consecuencias del síntoma. Materiales y métodos: estudio descriptivo con abordaje cualitativo. Se realizó entrevista semiestructurada a 27 hombres en relación con las características de los síntomas experimentados y se analizó la información mediante la técnica de análisis de contenido. Resultados: categorías emergentes relevantes dentro de factores determinantes: "Pienso que hice un sobreesfuerzo", "No controlo la comida", "Es la herencia", "Tanto estrés". Dimensiones: las palabras más utilizadas fueron: "dolor", a veces acompañado de "presión" en el pecho y "dolor de oreja a oreja". Irradiación a brazo izquierdo y ocasionalmente a espalda. Síntomas acompañantes: gastrointestinales, fatiga y hormigueo. Consecuencias: "Me toca cambiar", "Nada va a cambiar", "Me va a afectar". Conclusiones: se obtuvo un perfil característico que refleja la forma de vivir la enfermedad coronaria que facilita la comprensión del fenómeno y que orienta los cuidados pertinentes.

  12. O carvedilol no tecido conjuntivo cardíaco de ratos durante o desenvolvimento da hipertrofia miocárdica concêntrica

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    Leomil Neto Moacir

    2006-01-01

    Full Text Available A estimulação catecolaminérgica precoce e excessiva do coração, que ocorre na insuficiência cardíaca congestiva, acentua a sobrecarga de pressão e o volume nos ventrículos, agravando, conseqüentemente, a isquemia miocárdica, causando morte de miócitos com deposição de tecido conjuntivo e progressiva redução do débito cardíaco. O carvedilol, um b e alfa1-bloqueador não cardio-seletivo, vem sendo associado a melhorias na função miocárdica e à regressão da hipertrofia ventricular esquerda. O objetivo do presente trabalho foi avaliar a ação do carvedilol em ratos submetidos a um modelo experimental de hipertrofia miocárdica por sobrecarga de pressão, por meio da coartação da aorta subdiafragmática. Ratos Wistar (65 animais foram divididos em quatro grupos: não coartados/tratados com placebo, coartados/tratados com placebo, coartados/tratados com 0,1mg kg-1 de carvedilol e coartados/tratados com 1mg kg-1 de carvedilol. Após o procedimento cirúrgico e 20 dias de tratamento, os animais foram submetidos à eutanásia e coletados fragmentos que, depois de fixados em formol a 10% e processados pela técnica histológica convencional utilizando coloração picrossirius, permitiram contagem de tecido conjuntivo nos ventrículos esquerdo e direito. Resultados: nos animais coartados/tratados com placebo, houve aumento na porcentagem de tecido conjuntivo nos ventrículos esquerdo e direito; nos coartados/tratados com 0,1mg kg-1 de carvedilol, houve uma redução parcial da quantidade de tecido colágeno do ventrículo esquerdo e direito, e, nos coartados/tratados com 1mg kg-1 de carvedilol, houve uma redução significativa na quantidade de tecido colágeno do ventrículo esquerdo.

  13. Incidência de coronariopatia após o transplante cardíaco ortotópico Incidence of coronariopathy after orthotopic heart transplantation

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    Alfredo I Fiorelli

    1994-06-01

    Full Text Available O presente estudo tem por finalidade analisar tardiamente o padrão anatômico evolutivo das artérias coronárias do coração transplantado. Para cumprir tal proposição foram selecionados 22 pacientes submetidos ao transplante cardíaco ortotópico, com seguimento pós-operatório superior a 36 meses. As variáveis eleitas para este fim foram aferidas anualmente até o quinto ano de pós-operatório. A análise da ventriculografia mostrou a estabilidade da fração de ejeção (p=0,99 em valores normais. A cineangiocoronariografia seqüencial evidenciou incidência crescente de lesões arteriais com comprometimento da função contrátil. As lesões obstrutivas acometeram as artérias coronárias difusamente, com predomínio no território distai. Os episódios de rejeição aguda e a etiologia da cardiomiopatia não modificaram a evolução natural da aterosclerose coronária.The purpose of this study was to analise late anatomical status of coronary arteries in patients (pts in whom orthotopic heart transplantation(OHT was perfomed. We studied 22 pts submitted to OHT with post-operative follow-up longer than 36 months. They were evaluated by cinecoronariography every year in a 5 years follow-up. Ventriculography analisis showed stability (in normal values of the left ventricular ejection fraction (p= 0,99 during the follow-up period. The sequential coronary studies showed a progressive increase on incidence of abnormalities in coronary arteries with disorders of contratile function. The obstructive abnormalities were present in all segments but more in distal territories. The acute rejection episodes and cardiomiopathy etiologies didn't change the natural evolution of coronary atherosclerosis.

  14. Drenagem anômala total das veias pulmonares: terapêutica cirúrgica dos tipos anatômicos infracardíaco e misto

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    Atik Fernando Antibas

    2004-01-01

    Full Text Available OBJETIVO: Estudar a evolução hospitalar em portadores de drenagem anômala total de veias pulmonares (DATVP, nas formas infracardíaca e mista, submetidos a tratamento cirúrgico. MÉTODOS: De 65 pacientes operados com o diagnóstico isolado de DATVP, de dezembro/1993 a março/2002, foram selecionados, retrospectivamente, 7 (10,8% pacientes das formas mista e infradiafragmática, sendo 5 (71,4% do sexo masculino, idades variando de 5 dias a 19 (média de 7 meses, com diagnóstico clínico feito pelo ecocardiograma bidimensional. Quatro (57,1% pacientes apresentavam formas mistas, em um, obstrutiva intrínseca, com estenose discreta da veia inferior esquerda. Os restantes três (42,9% apresentavam a forma infradiafragmática obstrutiva, extrínseca ao nível do diafragma. Todas as operações foram realizadas através de esternotomia mediana, sob circulação extracorpórea hipotérmica com parada circulatória total em 2 casos. RESULTADOS: Óbito hospitalar ocorreu em 1 paciente com DATVP infradiafragmática com conexão da veia vertical inferior com a veia porta. A causa mortis foi relacionada à falência de múltiplos órgãos e sistemas. O pós-operatório foi caracterizado pela presença de baixo débito cardíaco e hipertensão pulmonar em 4 (57,1% pacientes. CONCLUSÃO: O resultado da correção cirúrgica desta anomalia está associado à morbidade e mortalidade aceitáveis, na dependência do encaminhamento e tratamento cirúrgico precoces, sem progressão do quadro de hipertensão vascular pulmonar.

  15. Estado, iglesia y sociedad en la Monarquía Hispana de Carlos IV. Las apreciaciones de un embajador austríaco en Madrid

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    Álvarez Gutiérrez, Luis

    2003-12-01

    Full Text Available This writing deals with an historiographical analysis of the contents of the diplomatic dispatches sent to Vienna by the imperial ambassador, John Frederick count of Kageneck, accredited at the Court of Charles IV. They concern to the first seven years of that reign (1789-1795. Provide issues, appreciations, and commentaries about the conditions of the contemporaneous Hispanic kingdom in the matter of institutional, administrative, political, economic, social, religious, military affairs, international relations and geostrategical interests. The Austrian diplomat pays much attention to the consequences of the French revolution in Spain; to the measures adopted by the Spanish authorities against the spread of the subversive ideas, as much in the metropolis, as in the overseas dominions, with special reference to the outstanding rôle played by the clergy, as the ideological and moral bulwark against the impetuous attacks of the French revolutionary activity; to the attitude of Spain with regard to the purpose of forming an international coalition against the revolutionary France; and to the later access of Spain in the war against the France of the Convention (1793-1795.

    Este trabajo propone un análisis historiográfico del contenido de los despachos diplomáticos enviados a Viena por el embajador imperial, Juan Federico de Kageneck, acreditado ante la Corte de Carlos IV. Corresponden a los siete primeros años de aquel reinado (1789-1795. Proporcionan datos, apreciaciones y comentarios sobre el estado de la monarquía hispana de la época en sus aspectos institucionales, administrativos, políticos, económicos, sociales, religiosos, militares, relaciones internacionales, e intereses geoestratégicos. El diplomático austríaco dedica atención preferente a las repercusiones de la Revolución francesa en España; a las medidas adoptadas por las autoridades españolas para contrarrestar la difusión de las ideas subversivas, tanto en la

  16. Cintilografia de perfusão miocárdica e comprometimento cardíaco na fase indeterminada da doença de chagas

    Directory of Open Access Journals (Sweden)

    Amalia Peix

    2013-02-01

    Full Text Available FUNDAMENTO: A cintilografia de perfusão miocárdica (CPM tem sido utilizada na avaliação da cardiopatia chagásica. OBJETIVO: Investigar o valor da CPM com tomografia computadorizada por emissão de fóton único (gated-SPECT para detectar comprometimento cardíaco precoce em pacientes chagásicos na fase indeterminada, que apresentam anomalias de movimento segmentar detectadas por exame de imagem por Doppler tecidual (IDT strain derivada. MÉTODOS: Foram incluídos 40 indivíduos (idade média: 25 ± 2 anos, 50% homens de uma área endêmica da doença de Chagas e com diagnóstico sorológico positivo. Todos foram submetidos à CPM com gated-SPECT de 2 dias (repouso e estresse e ecocardiografia. RESULTADOS: Trinta indivíduos (75% apresentaram resultados normais. Em três casos (8%, a CPM apresentou resultado ligeiramente anormal e em sete foi ambígua. Em todos os casos com defeitos reversíveis, os segmentos afetados foram coincidentes com aqueles com anomalias de movimento. Foi encontrada redução na fração de ejeção ventricular esquerda (FEVE > 5% (ΔLVEF% < -5 pós-estresse em 11 dos 40 indivíduos (28%. Tanto o desvio padrão fasederivado como a largura da banda do histograma mostraram diferença significativa entre o pós-estresse e a fase de repouso. Em ambos os casos, houve ligeira dessincronia em repouso normalizado no pós-estresse. CONCLUSÃO: Uma abordagem estresse-repouso com gated-SPECT é válida para detectar alterações miocárdicas precoces, bem como dessincronia intraventricular na fase indeterminada da doença de Chagas em pacientes com anomalias no movimento segmentar previamente detectadas pela IDT strain derivada.

  17. A-508 class 3 forgings for pressure vessels

    International Nuclear Information System (INIS)

    Comon, J.

    1977-01-01

    The manufacture of the forged parts of the first PWR nuclear pressure vessel installed in France started in the Creusot-Loire's Forge Plant in 1961. Since this date, more than 300 forgings of this type were delivered (flanges, rings, zones, and nozzles). The major part of these forgings were made of Mn, Ni, Mo steel (SA 508 class 3). They represent a population large and homogeneous enough to attempt a statistical analysis of chemical and mechanical test results. The aim of this analysis was double: (1) a better knowledge of the scattering of the results and a better estimate of what can be introduced or accepted in a specification, and (2) the setting up of correlations existing between these results, particularly between chemical analysis and mechanical test results. In addition to this statistical analysis concerning industrial results, several laboratory studies are presented, giving a more complete characterization of SA 508 class 3. All these results form a very complete documentation showing that SA 508 class 3 steel is suitable for the manufacture of large forged vessels requiring a high degree of reliability

  18. “Manifestos do Coração”: Significados Atribuídos à Doença por Pacientes Cardíacos Pré-cirúrgicos

    Directory of Open Access Journals (Sweden)

    Shana Hastenpflug Wottrich

    Full Text Available RESUMOEste estudo objetivou explorar os significados atribuídos à doença cardíaca por pacientes cardíacos pré-cirúrgicos em tratamento ambulatorial no sul do Brasil. É um estudo clínico-qualitativo, de caráter exploratório e descritivo, cuja coleta de dados aconteceu por meio de entrevistas semiestruturadas e da autofotografia, propostas a 15 indivíduos. Foi realizada análise de conteúdo temática, emergindo as categorias: Confrontação com a doença: os saberes em questão, Negação da doença, Doença e trabalho e Sexualidade rompida. Os resultados destacaram as dificuldades dos participantes relacionadas à apropriação do quadro da doença e à aceitação dessa condição. Salienta-se a premência de ações de saúde, que possam ser coadjuvantes na reestruturação das possibilidades de vida para os pacientes cardíacos pré-cirúrgicos.

  19. Utilização de valvas homólogas e heterólogas em condutos extracardíacos The use of homograph and heterograph valves in extracardiac conduits

    Directory of Open Access Journals (Sweden)

    Rui Siqueira de Almeida

    1988-08-01

    Full Text Available O conceito do uso de um conduto extracardíaco para estabelecer uma via de saída, conectando o ventrículo direito com o tronco pulmonar, ou seus ramos, foi desenvolvido na década de 60. Entre 1971 e 1986, 335 pacientes receberam, no The Hospital for Sick Children, de Londres, condutos extracardíacos para o lado direito do coração; 176 destes foram homoenxertos aórticos, preservados em solução antibióticonutriente; 140 heteroenxertos (Hancock, Ross, Carpentier-Edwards, lonescu-Shiley e 19 tubos não valvulados. Estes condutos foram usados na correção de defeitos cardíacos complexos. A idade média foi de 6,34 anos e o peso médio, de 17,8 kg. O diâmetro interno dos condutos variou de 8 a 30 mm. A mortalidade hospitalar foi de 29,2% e o seguimento dos sobrevivente teve uma duração máxima de 14,3 anos, sendo que apenas 40% delas foram relacionadas ao conduto extracardíaco. A curva atuarial, livre de obstrução, dos condutos extracardíacos foi significativa, quando se analisaram os homoenxertos, face a cada grupo de heteroenxertos (p The concept of using extracardiac conduits, to establish an outflow tract between the right ventricle and the pulmonary artery was developed on the sixties. Between 1971 and 1986, 335 patients received extracardiac conduits for the right heart, at The Hospital for Sick Children, London; 176 were antibiotic preserved aortic homografts (Hancock, Ross, Carpentier-Edwards, lonescu-Shiley and 19 non-valved tubes. These conduits were used for the repair of complex congenital heart defects. The mean age of these groups was 6.34 ± 4.6 years and the mean weight 17.8 ± 10.8 kg. The internal diameter of the conduits varied from 8 to 30 mm. The hospital mortality was 29.2% and long-term follow-up of the survivals had a maximum period of 14,39 years. Sixty patients (17.9% were submited to 60 reoperations, being only 40% conduit related. The actuarial survival cun/e of freedom from obstruction was significant

  20. The correlation between accelerated and field corrosion tests performed in carbon steel and weathering steel coupons, coated and non-coated; Correlacao entre ensaios acelerados e ensaios de campo em corpos-de-provas de aco carbono e aco patinavel, sem e com revestimento

    Energy Technology Data Exchange (ETDEWEB)

    Antunes, Renato Altobelli

    2002-07-01

    The performance of four different organic coating systems applied to carbon and weathering steel coupons has been assessed in this investigation. applied on the surface of carbon steel and weathering steel coupons. The coupons have been evaluated using five different tests, three field tests and two accelerated tests. The field tests were carried out at three atmospheric stations, located at COSIPA in Cubatao-SP, at Alto da Serra in Cubatao-SP and at Paula Souza in Sao Paulo city. The accelerated tests consisted of (a) exposure to alternate cycles of ultraviolet radiation/condensation combined with salt spray cycles (UVCON combined with Salt Spray) and of (b) exposure to alternate cycles of ultraviolet radiation/condensation combined with the Prohesion test. The performance of the coatings was assessed by visual observation and photographs, using a method based on ASTM D-610, ASTM D-714 and ASTM-1654 standards to rank them. The oxide phases formed on the surfaces of the non-coated specimens of carbon and weathering steels, exposed to the same tests performed with the coated specimens, were identified using three different techniques: X-ray diffraction, Raman microscopy and Moessbauer spectroscopy. In the field tests, the specimens have been exposed for 1, 2, 3, 6 and 9 months. In the accelerated ones, the results were obtained after 1340 hours (4 cycles) test. The main component identified in all the specimens collected from the field tests and from the UVCON combined with the Prohesion test was lepidocrocite ({gamma}-FeOOH). Goethite ({alpha}-FeOOH ) and magnetite (Fe{sub 3}O{sub 4}) were identified as the other two main phases present in ali the specimens. In the UVCON combined with Salt Spray test, the dominant phase was magnetite, followed by goethite and lepidocrocite. The morphology of the rust formed on the specimens was examined by scanning electron microscopy (SEM). Structures corresponding to goethite and lepidocrocited were recognized on ali specimens

  1. Estimation of quasi-static J–R curves from Charpy energy and adaptation to ASTM E 1921 reference temperature estimation of ferritic steels

    International Nuclear Information System (INIS)

    Sreenivasan, P.R.

    2014-01-01

    Many researchers had suggested a sort of scaling procedure for predicting the quasi-static J–R curves from dynamic J–R curves obtained from instrumented Charpy V-notch (CVN) impact tests using key-curve, compliance or other procedures. Chaouadi, based on extensive tests and literature data, had quantitatively formalized the method and suggested general applicability of his method for a class of steels. In this paper, first, the Chauoadi-procedure is tried on some selected data from the literature (including the data used by Chaouadi and other workers) and an adaptation of the method is suggested using Wallin's as well as Landes's lower bound methods for upper-shelf J–R curve estimation from CVN energy. Using Chaouadi and other data as the benchmark, suitable scaling factors have been determined that enable estimation of quasi-static J–R curves from CVN energy alone, without the need for dynamic CVN J–R curves. The final formulae are given. This new method can be called modified Wallin–Landes procedure. Then this method is applied to fracture toughness and reference temperature (T 0 – ASTM E-1921) estimation from the full Charpy-transition data. The results are compared with those from the author's IGC-procedure, and modifications, if any, are suggested. Based on the new results, it is suggested that the IGC-procedure may be modified as: final T Q-est = T Q-IGC for T Q-Sch dy ≤ 20 °C (in the IGC-procedure the dividing temperature was 60 °C); and for T Q-Sch dy > 20 °C, T Q-IGC = T Q-WLm (different from the IGC-procedre and subscript WLm indicating modified Wallin–Landes procedure). For the 59 or more steels examined (including highly irradiated steels), the T Q-WL estimates at higher temperatures are consistent and conservative; a few non-conservative values are acceptably less than 20 °C, whereas other predictions show non-conservatism of up to 40–50 °C. At lower temperatures, T Q-IGC is consistently conservative and not over

  2. Consulta de enfermagem ao cliente transplantado cardíaco: impacto das ações educativas em saúde Consulta de Enfermería al cliente trasplantado cardíaco: impacto de las acciones en salud Appointment with nurses for transplanted heart clients: impact of educative health actions

    Directory of Open Access Journals (Sweden)

    Zélia Maria de Sousa Araújo Santos

    2004-12-01

    Full Text Available O estudo teve como objetivo avaliar o impacto das ações educativas em saúde, na consulta de Enfermagem com 18 clientes transplantados cardíacos, embasado na Teoria de Orem. Foi realizado em uma Unidade de Transplante e Insuficiência Cardíaca de uma Instituição Pública de Saúde de Fortaleza - Ce. Os dados foram coletados através da consulta de Enfermagem. Identificou-se 14 diagnósticos de enfermagem na primeira consulta e 7 na última. Constatou-se que, os clientes desenvolveram habilidades para o autocuidado, com a implementação das ações educativas em saúde, tornando-os agentes de autocuidado, com o alcance de um bom nível de saúde e bem-estar. Por outro lado, despertou no enfermeiro, um direcionamento sistemático e eficaz no acompanhamento ambulatorial a esta clientela.El estudio tiene como objetivo, evaluar el impacto de las acciones educativas en salud, en la consulta de Enfermería con 18 cliente trasplantados cardíacos, basado en la teoría de Orem. Se realizó en una Unidad de Trasplante e Insuficiencia Cardiaca de una Institución Pública de Fortaleza-Ce. Se colectaron los datos a través de consulta de enfermería. Se identificaron 14 diagnósticos en la primera consulta y 7 en la última. Hubo la constatación de que, los clientes desarrollaron habilidades para el autocuidado, con la implementación de las acciones educativas en salud, volviéndose agentes de autocuidado, con el alcance de un buen nivel de salud y bienestar. Por otro lado, estimuló en el enfermero, una dirección sistemática y eficaz en el acompañamiento ambulatorial a esta clientela.The study was aimed at evaluating the impact of educative health actions on nursing appointments with 18 transplanted heart clients, based on Orem's Theory. It was conducted in a Heart Transplant and Insufficiency Unit of a Public Health Institution in Fortaleza - CE. The data were collected by way of nursing appointments. 14 nursing diagnoses were identified in

  3. Determination of the sensitization of two coatings by steel welding 308l by the EPR-Dl and Astm A-262 practice A techniques; Determinacion de la sensibilizacion de dos revestimientos por soldadura de acero 308L por las tecnicas EPR-DL y ASTM A-262 practica A

    Energy Technology Data Exchange (ETDEWEB)

    Arganis J, C. R.; Zenteno S, J. C.; Robles F, J. L.; Rodriguez M, E.; Vazquez P, A., E-mail: carlos.arganis@inin.gob.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2014-10-15

    A stainless steel 308l coating was deposited by the shielded metal arc welding (SMAW) on steel A36 with a thickness of 4.726 mm in three layers. The sensitization was measured with the technique of Electrochemical Potentiodynamic Reactivation of Double-loop (EPR-Dl), using a portable cell and other of conventional window. The standard Astm A-262, practice A was used to verify the sensitization values. Two samples were used, a welding on a plate of 323 x 172 x 76.2 mm and the second welding on the end of a plate of 12.7 mm of thickness and 280 mm of longitude, with a post-welding process with gas tungsten arc welding (GTAW) with electrode ERNiCr{sub 3} and a process SMAW with electrode ENICRFe{sub 3}. The coating on the plate showed low values of sensitization grade (DOS) in all the points, indicating a very quick heat extraction and an inter dendritic structure type step. The second sample presented DOS values that are related with a structure of low sensitization and the influence of the heat of the post-welding process and a structure of recrystallized grains. (Author)

  4. Transplante cardíaco infantil: perspectivas e sentimentos maternos Trasplante cardiaco infantil: perspectivas y sentimientos maternos Heart transplant in children: maternal perspectives and feelings

    Directory of Open Access Journals (Sweden)

    Kiarelle Lourenço Penaforte

    2009-12-01

    Full Text Available Objetiva-se descrever as perspectivas maternas e sentimentos despertados pelo transplante cardíaco infantil. Estudo descritivo com abordagem qualitativa, desenvolvido no Hospital do Coração, de Messejana, em Fortaleza-CE, no período de agosto a novembro de 2007. Os sujeitos foram sete mães de crianças transplantadas. Utilizaram-se como técnicas a entrevista semiestruturada e a análise dos prontuários. Os dados foram submetidos à análise de conteúdo, em três etapas, segundo Bardin, organizados, analisados e interpretados à luz da literatura pertinente, vivência das pesquisadoras e experiência das entrevistadas. Da análise das falas, emergiram as unidades temáticas: necessidade do transplante; fonte de apoio; sentimentos externados pelas mães; a doação e perspectivas. Conclui-se que a doação é um momento de felicidade vivenciada por todas as mães, tratando-se da solução para vida de seus filhos, e a presença autêntica do enfermeiro nesta ocasião torna-se ainda mais essencial, pois humanizar faz parte do cuidar da enfermagem.El objetivo fue describir las perspectivas maternas y los sentimientos provocados por el trasplante cardiaco infantil. Estudio descriptivo con abordaje cualitativo, desarrollado en el Hospital del Corazón, de Messejana, en Fortaleza-CE, en el período de agosto a noviembre del 2007. Los sujetos del estudio fueron siete madres de niños con transplante . Se utilizó como técnica la entrevista semiestructurada y el análisis de los registros médicos. Los datos fueron sometidos al análisis del contenido, en tres etapas, según Bardin, siendo organizados, analizados e interpretados a la luz de la bibliografía pertinente, de la vivencia de las investigadoras y de la experiencia de las entrevistadas. Del análisis del discurso , surgieron las unidades temáticas la necesidad del trasplante; las fuente de ayuda; los sentimientos expresados por las madres; la donación y sus perspectivas. Se concluy

  5. Evolução tardia do transplante cardíaco na doença de Chagas: long-term evolution in cardiac transplantation Chagas' Disease

    Directory of Open Access Journals (Sweden)

    Alfredo I Fiorelli

    1990-08-01

    Full Text Available Nas formas cardíacas da doença de Chagas que evoluem com insuficiência cardíaca refratária ao tratamento clínico, o transplante é a única alternativa, ao lado da cardiomioplastia. Os autores apresentam a evolução tardia de seis pacientes com miocardiopatia chagásica terminal submetidos a transplante cardíaco ortotópico. O período médio de observação foi de 25,2 meses. O diagnóstico de reativação da doença de Chagas apoiou-se na observação clínica, na investigação laboratorial do parasita, nas biópsias endomiocárdicas e dos nódulos de subcutâneo. A análise dos resultados demonstra que: 1 os testes laboratoriais mostraram-se ineficazes no diagnóstico da reativação da doença, sendo que as biópsias mostraram maior índice de positividade; 2 a pulsoterapia com corticóide predispõe à reativação; 3 a doença linfoproliferativa apresenta alta incidência na doença de Chagas, sendo a principal complicação tardia. Possivelmente, o benzonidazol apresente seu efeito oncogênico potencializado. Tendo em vista o caráter endêmico da doença e a falta de alternativa terapêutica, tornou-se obrigatória a analise do esquema imunossupressor, do tratamento da reativação e a maior experiência clínica, para posições mais definidas.In the cardiac forms of Chagas' Disease that develop with refractory cardiac failure under clinical treatment, the transplant is the only alternative along with the cardiomyoplasty. The authors present the six patient late evolution with terminal chagasic myocardiopathy submitted under on orthopic heart transplantation. The average period of observation was of 25.2 months. The diagnosis of Chagas' Disease reativation relies on the clinical observation, laboratory investigation of parasito, endomyocardial biopsy and subcutaneous nodules. The analyses of the results show that: 1 the laboratory exams were useless in the diagnosis of the disease reativation, but the biopsy presented hight

  6. Validation of methods for WDXRF and OES-spark techniques in steel analysis. Determination of the uncertainty of measurements for API steel plant sample; Validacao de metodos para as tecnicas de WDXRF e OES-spark na analise de acos. Calculo de incerteza de medicao para amostras de processo, aco classe API

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Carlos Eduardo da

    2009-07-01

    The increase of gas and petroleum demanding in the national and international markets, the specification and certification of the chemical analysis results of gas and oil pipe-line have became more and more challenging. A continuous development has been outlined to improve API grade alloy steels (American Petroleum Institute). The steel properties depend on the chemical composition control and process parameters during its manufacturing. In this work, a comparison of the measurement uncertainty between X-ray fluorescence (WD system) and Optical Emission (OES-spark) spectrometry, for API grade steel plant samples analysis, was outlined. Usually, this kind of analyze requires less than 40 seconds for full chemical characterization for adjustment in the process parameters production. The main influence source in the chemical analysis was evaluated for design of experiments. The constituents and trace elements such as Al, Si, P, S, Ti, V, Cr, Mn, Co, Ni, Cu, As, Nb, Mo and Sn were determined using the ASTM E-322, E-415, E-1009 and E-1085 standard methodologies. The 185A and 187A certified reference materials from CMI (Czech Metrology Institute) were used for evaluation of the methods. The uncertainty of the measurement, precision, accuracy, repeatability and reproducibility of the measurements were obtained applying statistic tests, recommended by ISO/IEC 17025. The uncertainty of measurement for each element is discussed for both techniques. (author)

  7. Whole glove permeation of cyclohexanol through disposable nitrile gloves on a dextrous robot hand and comparison with the modified closed-loop ASTM F739 method 1. No fist clenching.

    Science.gov (United States)

    Mathews, Airek R; Que Hee, Shane S

    2017-04-01

    The aim was to develop a whole glove permeation method for cyclohexanol to generate permeation parameter data for a non-moving dextrous robot hand (normalized breakthrough time t b , standardized breakthrough time t s , steady state permeation rate P s , and diffusion coefficient D). Four types of disposable powderless, unsupported, and unlined nitrile gloves from the same producer were investigated: Safeskin Blue and Kimtech Science Blue, Purple, and Sterling. The whole glove method developed involved a peristaltic pump for water circulation through chemically resistant Viton tubing to continually wash the inner surface of the test glove via holes in the tubing, a dextrous robot hand operated by a microprocessor, a chemically protective nitrile glove to protect the robot hand, an incubator to maintain 35°C temperature, and a hot plate to maintain 35°C at the sampling point of the circulating water. Aliquots of 1.0 mL were sampled at regular time intervals for the first 60 min followed by removal of 0.5 mL aliquots every hour to 8 hr. Quantification was by the internal standard method after gas chromatography-selective ion electron impact mass spectrometry using a non-polar capillary column. The individual glove values of t b and t s differed for the ASTM closed loop method except for Safeskin Blue, but did not for the whole glove method. Most of the kinetic parameters agreed within an order of magnitude for the two techniques. The order of most protective to least protective glove was Blue and Safeskin, then Purple followed by Sterling for the whole gloves. The analogous order for the modified F739 ASTM closed loop method was: Safeskin, Blue, Purple, and Sterling, almost the same as for the whole glove. The Sterling glove was "not recommended" from the modified ASTM data, and was "poor" from the whole glove data.

  8. Kinetic and morphological differentiation of ettringites in plain and blended Portland cements with metakaolin and the ASTM C 452-68 test. Part II: Morphological differentiation by SEM and XRD analysis

    Directory of Open Access Journals (Sweden)

    Talero, R.

    2009-03-01

    Full Text Available The same cementitious materials (OPCs, SRPCs and matekaolin, MK, the same blended cements and the same ASTM C 452-68 test than in Part I, were used. Other complementary determinations were: chemical analysis of cementing materials, SEM and XRD analysis of ettringites and specific properties of some cement tested and of their pastes.The experimental results have also demonstrated that when 7.0% SO3, equivalent to 15.05% of gypsum, was added to the M pozzolan-containing Portland cement and tested with the ASTM C 452-68 method, it was not found to behave aggressively but rather as “setting regulator ”, because the increase in mechanical strengths over time and setting times in these mixes were, therefore, similar to the pattern observed in any PC. However, when the gypsum content was raised to triple than that amount (21.0% SO3, it behaved aggressively. In both cases, logically, ettringite from both origins were involved in the resulting beneficial or adverse behavior.En esta Parte II se utilizaron los mismos materiales cementíceos (CPO, CPRS, y metakaolín, MK, los mismos cementos de mezcla y el mismo método de ensayo ASTM C 452-68 que en la Parte I. Otras determinaciones complementarias fueron: análisis químico de los materiales cementíceos, análisis por DRX y SEM de ettringitas y propiedades específicas de algunos cementos ensayados y de sus pastas.Los resultados experimentales obtenidos han demostrado también que, el 7.0% de SO3 presente en los 30 cementos de mezcla con MK, ensayados conforme el método ASTM C 452-68, no se comporta como agresivo sino como ”regulador de fraguado”, porque los tiempos de fraguado y el aumento de resistencias mecánicas fueron como los de cualquier CP. De aquí que algunos de esos cementos de mezcla puedan ser considerados “cementos hidráulicos expansivos”, el resto, no. Sin embargo, cuando la cantidad de yeso aportada fue el triple (21,0% SO3, se comportó como agresivo, motivo por el cual

  9. Estimation of quasi-static J–R curves from Charpy energy and adaptation to ASTM E 1921 reference temperature estimation of ferritic steels

    Energy Technology Data Exchange (ETDEWEB)

    Sreenivasan, P.R., E-mail: sreeprs@yahoo.co.in

    2014-04-01

    Many researchers had suggested a sort of scaling procedure for predicting the quasi-static J–R curves from dynamic J–R curves obtained from instrumented Charpy V-notch (CVN) impact tests using key-curve, compliance or other procedures. Chaouadi, based on extensive tests and literature data, had quantitatively formalized the method and suggested general applicability of his method for a class of steels. In this paper, first, the Chauoadi-procedure is tried on some selected data from the literature (including the data used by Chaouadi and other workers) and an adaptation of the method is suggested using Wallin's as well as Landes's lower bound methods for upper-shelf J–R curve estimation from CVN energy. Using Chaouadi and other data as the benchmark, suitable scaling factors have been determined that enable estimation of quasi-static J–R curves from CVN energy alone, without the need for dynamic CVN J–R curves. The final formulae are given. This new method can be called modified Wallin–Landes procedure. Then this method is applied to fracture toughness and reference temperature (T{sub 0} – ASTM E-1921) estimation from the full Charpy-transition data. The results are compared with those from the author's IGC-procedure, and modifications, if any, are suggested. Based on the new results, it is suggested that the IGC-procedure may be modified as: final T{sub Q-est} = T{sub Q-IGC} for T{sub Q-Sch}{sup dy} ≤ 20 °C (in the IGC-procedure the dividing temperature was 60 °C); and for T{sub Q-Sch}{sup dy} > 20 °C, T{sub Q-IGC} = T{sub Q-WLm} (different from the IGC-procedre and subscript WLm indicating modified Wallin–Landes procedure). For the 59 or more steels examined (including highly irradiated steels), the T{sub Q-WL} estimates at higher temperatures are consistent and conservative; a few non-conservative values are acceptably less than 20 °C, whereas other predictions show non-conservatism of up to 40–50 °C. At lower temperatures

  10. Identificação da comunidade componente de helmintos, gastrointestinais hepáticos, pulmonares, cardíacos e renais de Otaria flavescens (Leão-marinho-do-sul), no litoral sul do Brasil

    OpenAIRE

    PEREIRA, Eliane Machado

    2012-01-01

    Este estudo analisou os helmintos parasitos gastrointestinais, pulmonares, cardíacos e renais do O. flavescens no litoral sul do Rio Grande do Sul, Brasil. Foram necropsiados 29 leões-marinhos, cujas carcaças apresentavam baixo estado de decomposição. Os órgãos coletados mediante necropsia a campo para análise em laboratório foram 24 intestinos delgado e grosso, 24 fígados incluindo parênquima e vesícula biliar e 29 estômagos, 24 corações e 24 pares de rins. Os órgãos foram congelados a 2...

  11. Division des activités économiques entre chinois, 'injertos' et métis dans la communauté d'Acos 1920-1950. Vallée de Chancay - Pérou

    Directory of Open Access Journals (Sweden)

    1981-01-01

    Full Text Available Ce second article traitant de la micro-colonie chinoise établie depuis 1870 dans la communauté d'Acos (Vallée de Chancay s'attache cette fois à montrer la division nette des activités économiques pratiquées d'un côté par les Chinois et métis chinois ou 'injertos' et les membres des 'familles dites légitimes' qui détenaient le pouvoir depuis plusieurs siècles. Au départ il s'agit d'une opposition entre deux formes de pouvoir: le pouvoir foncier des métis blancs acosinos et le pouvoir économique des Chinois et 'injertos'. Entre 1920 et 1950, la puissance des Chinois et le retour après un temps d'intégration (cf article précédent à un certain individualisme furent autant de facteurs favorisant racisme et tension. Après avoir stimulé par leur présence et leurs activités l'économie locale, les Chinois abandonnèrent la place et laissèrent les familles 'légitimes' reprendre pouvoir foncier et pouvoir économique. Este segundo artículo relativo a la micro colonia china establecida desde 1870 en la Comunidad de Acos (Valle de Chancay trata esta vez de mostrar la clara división de las actividades económicas practicadas de un lado por los Chinos y mestizos Chinos o 'Injertos' y por otro lado por los miembros de las familias llamadas 'legítimas' que tenían el poder desde varios siglos. Al principio se trata de un antagonismo entre dos formas de poder: el poder de los Mestizos blancos de Acos basado en la propiedad de las tierras y el poder económico de los chinos e Injertos. De 1920 a 1950, el poder de los chinos y la vuelta después de una etapa de integración (cf artículo anterior a un cierto individualismo, fueron factores que favorecieron el racismo y la tensión. Después de haber impulsado por su presencia y sus actividades la economía local, los chinos abandonaron el lugar y dejaron que las familias 'legítimas' retomaran la propiedad de la tierra y un poder económico de origen comercial. This second article on

  12. Utilidade do Ultrassom intracardíaco no isolamento de veias pulmonares usando cateter-balão a laser Utilidad del ultrasonido intracardíaco en el aislamiento de venas pulmonares usando catéter-balón láser Utility of intracardiac ultrasound imaging to guide pulmonary vein ablation using laser balloon catheter

    Directory of Open Access Journals (Sweden)

    Luiz Leite

    2009-12-01

    Full Text Available FUNDAMENTO: O isolamento das veias pulmonares (IVP tem sido usado como endpoint para a ablação da fibrilação atrial (FA com cateter balão. OBJETIVO: Determinar a utilidade do ultrassom intracardíaco (USIC para guiar o IVP, usando cateter balão a laser. MÉTODOS: 59 VP foram ablacionadas em 27 cães. Imagens de Doppler foram usadas para identificar os vazamentos do fluxo sanguíneo entre a VP e o balão. Após cada liberação de energia, o cateter de mapeamento circular foi reposicionado para verificar se o isolamento tinha sido obtido. A posição de vazamento foi então correlacionada com a posição do gap no estudo patológico. A análise de regressão logística multivariada foi realizada. RESULTADOS: Cinquenta e nove VP foram submetidas à ablação. O tempo médio de energia liberada foi de 279±177 seg., o diâmetro médio do balão era de 23±3 mm, e o comprimento médio do balão era 25±4 mm. O isolamento completo foi obtido em 38/59 (64%, e foi significantemente mais comum sem vazamento: [30/38 (79% versus 8/23 (35%, pFUNDAMENTO: Se usó el aislamiento de las venas pulmonares (AVP como endpoint para la ablación de la fibrilación atrial (FA con catéter-balón. OBJETIVO: Determinar la utilidad del ultrasonido intracardíaco (USIC para guiar el AVP, usando catéter-balón láser. MÉTODOS: Se ablacionaron 59 VP en 27 perros. Se usaron imágenes de Doppler para identificar los derrames del flujo sanguíneo entre la VP y el balón. Tras cada liberación de energía, se reposicionó el catéter de mapeamiento circular para verificar si se obtuvo el aislamiento. Se correlaccionó, entonces, la posición del derrame con la posición del gap en el estudio patológico. Se realizó el análisis de regresión logística multivariada. RESULTADOS: Se sometieron 59 VP a la ablación. El tiempo promedio de energía liberada fue de 279±177 seg., el diámetro promedio del balón era de 23±3 mm, y la largura promedio del balón era 25±4 mm

  13. Ecocardiografia por Doppler tecidual no diagnóstico de rejeição após transplante cardíaco Ecocardiografía con Doppler tisular en el diagnóstico de rechazo después de transplante cardíaco Tissue doppler echocardiography in the diagnosis of heart transplantation rejection

    Directory of Open Access Journals (Sweden)

    Marcos Valério Coimbra Resende

    2011-07-01

    Full Text Available FUNDAMENTO: A biópsia endomiocárdica (BEM é o método padrão-ouro para o diagnóstico de rejeição celular (RC após transplante cardíaco (TC. OBJETIVO: Testar a hipótese de que o exame de imagem por Doppler tecidual (IDT pode detectar RC > 3A e agregar informação diagnóstica, comparado ao Doppler convencional. MÉTODOS: Cinquenta e quatro pacientes com TC foram submetidos à BEM e estudo ecocardiográfico através de IDT em até 24 horas. Comparamos os pacientes com TC e RC > 3A com pacientes com TC e RC 3A em 39/129 (30,2% das BEM. O melhor preditor isolado para o diagnóstico de RC foi a a'LAT, com sensibilidade de 76,3%, especificidade de 73,8% (p = 0,001. Na análise multivariada, a a'LAT (p = 0,001, a'SEP (p = 0,002, relação e'/a' LAT (p = 0,006, relação e'Mitral/ e'LAT (p = 0,014, SINF (p = 0,009 foram preditores de RC > 3A. Obtivemos um escore com sensibilidade de 88,2%, acurácia de 79,6%, e valor preditivo negativo de 92,9% para diagnosticar RC > 3A. O Doppler convencional (fluxo mitral e pulmonar venoso não foi relevante para predizer a RC > 3A. CONCLUSÃO: O estudo de IDT agregou informação diagnóstica para predizer RC > 3A quando comparado ao Doppler convencional. O modelo baseado em IDT pode ser tornar um método em potencial para detectar RC > 3A após TC.FUNDAMENTO: La biopsia endomiocárdica (BEM es el método gold standard para el diagnóstico de rechazo celular (RC después de transplante cardíaco (TC. OBJETIVO: Testear la hipótesis de que el examen de imagen con Doppler tisular (IDT puede detectar RC > 3A y agregar información diagnóstica, comparado al Doppler convencional. MÉTODOS: Cincuenta y cuatro pacientes con TC fueron sometidos a BEM y estudio ecocardiográfico a través de IDT en hasta 24 horas. Comparamos los pacientes con TC y RC > 3A con pacientes con TC y RC 3A en 39/129 (30,2% de las BEM. El mejor predictor aislado para el diagnóstico de RC fue la a'LAT, con sensibilidad de 76

  14. Vasculites e eosinófilos em biópsia endomiocárdica, como preditores de rejeição em transplante cardíaco Vasculitis y eosinófilos en biopsia endomiocárdica, como predictores de rechazo en transplante cardíaco Vasculitides and eosinophils in emdomyocardial biopsies as rejection predictors in heart transplantation

    Directory of Open Access Journals (Sweden)

    Reginaldo Cipullo

    2011-08-01

    Full Text Available FUNDAMENTO: O significado clínico de vasculites, lesões isquêmicas, efeito Quilty e da presença de eosinófilos em biópsias endomiocárdicas de receptores de transplante cardíaco com rejeições leves não foi ainda estabelecido. OBJETIVO: Verificar se esses achados histológicos encontrados nas biópsias endomiocárdicas (eosinófilos, vasculites, efeito Quilty e lesões isquêmicas são capazes de predizer rejeição aguda do enxerto. MÉTODOS: Foram reavaliadas 1.012 biópsias endomiocárdicas consecutivas; dessas, 939 foram classificadas como OR ou 1R pela Nomenclatura da Sociedade Internacional de Transplante de Coração e Pulmão de 2005, e divididas em dois grupos: (1 Biópsias preditoras: aquelas que precederam rejeição aguda; e (2 Biópsias não preditoras: aquelas que não precederam rejeição aguda. Comparamos a ocorrência dos seguintes achados histológicos: vasculites, lesões isquêmicas, efeito Quilty e eosinófilos por análise uni e multivariada entre os grupos. RESULTADOS: Após análise estatística verificou-se a presença de vasculite intensa e de eosinófilos como maiores preditores para rejeição aguda futura, apresentando respectivamente as seguintes razões de chance: 10,60 (IC95%: 3,62 - 31,06. p FUNDAMENTO: El significado clínico de vasculitis, lesiones isquémicas, efecto Quilty y de la presencia de eosinófilos en biopsias endomiocárdicas de receptores de transplante cardíaco con rechazos leves no fue aun establecido. OBJETIVO: Verificar si esos hallazgos histológicos encontrados en las biopsias endomiocárdicas (eosinófilos, vasculitis, efecto Quilty y lesiones isquémicas son capaces de predecir rechazo agudo del injerto. MÉTODOS: Fueron reevaluadas 1.012 biopsias endomiocárdicas consecutivas; de esas, 939 fueron clasificadas como OR o 1R por la Nomenclatura de la Sociedad Internacional de Transplante de Corazón y Pulmón de 2005, y divididas en dos grupos: (1 Biopsias predictoras: aquellas que

  15. Validation of the concept Risk for Decreased Cardiac Output Validación del concepto riesgo de débito cardiaco disminuido Validação do conceito risco de débito cardíaco diminuído

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    Eduarda Ribeiro dos Santos

    2013-02-01

    Full Text Available OBJECTIVES: to validate the concept "risk for decreased cardiac output". METHOD: Six of the eight steps suggested in the technique developed by Walker & Avant were adopted to analyze the concept of the phenomenon under study and the proposal made by Hoskins was used for content validation, taking into account agreement achieved among five experts. RESULTS: the concept "decreased cardiac output" was found in the nursing and medical fields and refers to the heart's pumping capacity while the concept "risk" is found in a large number of disciplines. In regard to the defining attributes, "impaired pumping capacity" was the main attribute of decreased cardiac output and "probability" was the main attribute of risk. The uses and defining attributes of the concepts "decreased cardiac output" and "risk" were analyzed as well as their antecedent and consequent events in order to establish the definition of "risk for decreased cardiac output", which was validated by 100% of the experts. CONCLUSION: The obtained data indicate that the risk for decreased cardiac output phenomenon can be a nursing diagnosis and refining it can contribute to the advancement of nursing classifications in this context.OBJETIVO: Validar el concepto riesgo del débito cardíaco disminuido. MÉTODO: Fue adoptada la técnica de Walker & Avant para analizar la definición del fenómeno enfocado, utilizando seis de las ocho etapas sugeridas y la propuesta de Hoskins para validar el contenido, considerándose la conformidad entre cinco expertos. RESULTADOS: el concepto de debito cardíaco disminuido se encuentra en las áreas enfermería y médica y su atención se centra en la capacidad de bombeo del corazón. Sin embargo, el concepto de riesgo es presente en un gran número de áreas. Las características definitorias de la disminución del gasto cardíaco mostraron como principal atributo deficiencia de la bomba cardiaca y, para el riesgo, el atributo de probabilidad. Analizados

  16. Estudo de Procedimentos de Soldagem MIG/MAG para Aplicação de Revestimentos de Liga de Níquel Inconel 625 em Aço Estrutural ASTM A387 Gr.11

    OpenAIRE

    Cavalcante, Nathália Escóssio; Andrade, Tathiane Caminha; Pinheiro, Pedro Helton Magalhães; Miranda, Hélio Cordeiro de; Motta, Marcelo Ferreira; Aguiar, Willys Machado

    2016-01-01

    Resumo O presente trabalho objetiva o estudo de técnicas de soldagem aplicadas a reparo de componentes fabricados em aço ASTM A387 Gr.11, largamente utilizado em aplicações da indústria do petróleo e gás. Devido ao regime de trabalho e necessidade de utilização de materiais com boa resistência mecânica e à corrosão, utilizou-se como metal de adição a liga UNS N06625 (Inconel 625). O processo de soldagem utilizado foi o MIG/MAG e a técnica de soldagem aplicada foi a dupla camada. A metodologia...

  17. Mechanical properties of API X80 steel pipe joints welded by Flux Core Arc Weld Process; Propriedades mecanicas de juntas de tubos de aco API X80 soldadas com arame tubulares

    Energy Technology Data Exchange (ETDEWEB)

    Ordonez, Robert E. Cooper; Silva, Jose Hilton F.; Trevisan, Roseana E. [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Engenharia Mecanica. Dept. de Engenharia de Fabricacao

    2003-07-01

    Flux Core Arc Welding processes (FCAW) are beginning to be applied in pipeline welds, however, very limited experimental data regarding mechanical properties of pipeline weld joints with these processes are available in the literature. In this paper, the effects of preheat temperature and type of FCAW on mechanical properties (microhardness and tensile strength) of API X80 weld joint steel are presented. FCAW processes with gas protection and self-shielded were used. Multipasses welding were applied in 30'' diameter and 0,625'' thickness tubes. Influence factors were: FCAW type and preheat temperature. Acceptance criteria of welded joints were evaluated by API 1104 standard for tensile strength test and ASTM E384-99 for microhardness test. The results obtained showed that FCAW type and preheat temperature have no influence on mechanical properties of API X80 joint steel. (author)

  18. Evaluation of performance of AISI 444 steel for application in distillation towers; Avaliacao do desempenho do aco AISI 444 para aplicacao como 'lining' em torres de destilacao

    Energy Technology Data Exchange (ETDEWEB)

    Guimaraes, R.F.; Miranda, H.C. de; Farias, J.P. [Universidade Federal do Ceara (DEMM/UFC), Fortaleza, CE (Brazil). Dept. de Engenharia Metalurgica e de Materiais. Lab. de Caracterizacao de Materiais], e-mail: rf.guimaraes@yahoo.com.br

    2008-07-01

    In this work, the behavior of the AISI 444 ferritic stainless steel submitted to thermal fatigue test and their corrosion resistance in heavy crude oil was evaluated. The AWS E309MoL-16 and E316L-17 weld metal was employed as filler metal. Plates of the AISI 444 were welded on ASTM A-516 Gr. 60 plates and submitted to fatigue thermal cycle. Samples were extracted from plates welded and heat treated immersed in heavy crude oil at 300 deg C. Optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive of X-ray analysis (EDX) were used to characterize the microstructure and the corroded surface. The results show that the AISI 444 stainless steels did not present cracks after the thermal fatigue cycle and the heat treated immerse in heavy crude oil. The electrode AWS E309MoL-16 show better corrosion resistance than the AWS E316L-17. (author)

  19. Metastização pulmonar na apresentação de angiossarcoma cardíaco – Caso clínico e discussão

    Directory of Open Access Journals (Sweden)

    Vítor Fonseca

    2009-11-01

    Full Text Available Resumo: Apresenta-se um caso clínico referente a doente de 35 anos, do sexo masculino sem antecedentes pessoais relevantes, admitido no serviço de urgência por quadro de toracalgia e tosse produtiva com alterações electrocardiográficas sugestivas de pericardite. Inicialmente admitido pelo Serviço de Cardiologia, com melhoria do quadro clínico após terapêutica anti-inflamatória; contudo, no internamento houve como intercorrência pneumonia de provável etiologia bacteriana, complicada por derrame pleural. Após a alta, foi referenciado à consulta de pneumologia, onde se manteve o estudo etiológico do derrame persistente, tendo vindo a complicar-se o seu quadro com alterações das cavidades cardiacas e múltiplos nódulos pulmonares, sugestivos de endocardite subaguda com embolização séptica pulmonar. Internado no serviço de Pneumologia e submetido a videotoracoscopia, foi-lhe diagnosticado angiossarcoma cardíaco com metastização pulmonar. Assistiu-se a uma rápida evolução do quadro clínico, quase fulminante, com falência cardíaca e óbito do doente sem ter iniciado radioterapia ou quimioterapia adjuvante. Abstract: We present a case report of a 35 year-old male without any relevant former pathology admitted to the emergency room with atypical chest pain, cough and sputum with ECG changes suggesting pericarditis. He was initially admitted to the cardiology ward and experienced clinical improvement after initiating anti-inflammatory treatment. As intercurrence he had bacterial origin pneumonia complicated by pleural effusion (PE. After discharge patient was referred to a pulmonology appointment where aetiological investigation of the PE was instigated. Investigation revealed changes in the cardiac cavities and multiple lung nodules, suggesting subacute endocarditis with septic pulmonary embolism. Admitted to the pulmonology unit patient underwent

  20. Dosagem de marcadores cardíacos CK-MB e TnIc e eletrólitos no envenenamento experimental por veneno de sapo em cães

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    Annelise C. Camplesi

    2009-08-01

    Full Text Available Dentre os sinais sistêmicos causados pelo envenenamento por veneno de sapo (bufotoxina em cães, os efeitos cardiotóxicos são um dos mais importantes. O objetivo deste estudo foi avaliar as potenciais alterações no músculo cardíaco de cães envenenados experimentalmente por veneno de sapo e observar as alterações eletrolíticas que podem ocorrer nesse tipo de envenenamento. Utilizaram-se 20 cães divididos em grupo controle (n=5 e grupo envenenado (n=15. O veneno de sapo foi extraído por meio de compressão manual das glândulas paratóides. Após anestesia geral, os cães do grupo controle receberam placebo (solução fisiológica e os do grupo envenenado uma alíquota do veneno por sonda orogástrica. As colheitas de sangue para dosagem dos marcadores cardíacos foram realizadas seis e 24 horas após o envenenamento. As colheitas de sangue para dosagem dos eletrólitos foram realizadas antes e duas, quatro, seis e 12 horas após o envenenamento. A análise estatística empregada foi o teste não-paramétrico de Mann-Withney (PAmong the systemic signs of toad venom (bufotoxin poisoning in dogs, the cardiotoxic effects are one of the most important. Thus, the objective of this experiment was to evaluate potential changes in the cardiac muscle in dogs poisoned experimentally by toad venom and to observe the eletrolyte alterations which may occur in this condition. Twenty dogs divided into control group (n=5 and poisoned group (n=15 were utilized. The toad venom was extracted by manual compression of the paratoidic glands. After general anesthesia, dogs in the control group received placebo and dogs in the poisoned group received the venom by orogastric catheter. Samples for dosage were collected 6 hours and 24 hours after poisoning and 0, 2, 4, 6 and 12 hours after poisoning for electrolytes dosage. The Man-Withney test was used for statistical analysis (P<0.05. The poisoned dogs showed (saline elevated levels of cardiac markers CK

  1. Avaliação ecocardiográfica do desenvolvimento cardíaco de cavalos atletas: comparação entre atividades físicas distintas

    Directory of Open Access Journals (Sweden)

    Carolina C.M. Bonomo

    2014-09-01

    Full Text Available A capacidade aeróbica dos equinos atletas pode ser explicada, em partes, pelo seu desenvolvimento cardíaco associado ao treinamento físico. O exame ecocardiográfico de equinos atletas permite a visualização destas alterações e da função cardíaca destes animais. Buscou-se avaliar ecocardiograficamente equinos de diferentes modalidades esportivas, para verificar se o tipo de atividade física desempenhada por cada grupo de animais promove diferenças estruturais ou funcionais cardíacas. 196 equinos foram submetidos à avaliação ecocardiográfica em repouso, sendo divididos em três grupos: grupo Polo, 44 equinos participantes de provas de Polo; grupo QM, 49 equinos da raça Quarto de Milha, participantes de provas de baliza e tambor, e grupo PSI, 103 equinos da raça Puro Sangue Inglês participantes de provas de corridas. Foram avaliados os seguintes índices cardíacos: SIV, DIVE e PLVE em sístole e diástole, AE em sístole, Ao em diástole, relação AE:Ao, FEj, VEj, VSFVE, VDFVE, FS%, E-S, TEVE, DC e FC. Os animais do grupo PSI apresentaram os maiores volumes de ventrículo esquerdo, tendo apresentado proporcionalmente menor eficiência quando analisado o VEj. Os animais do grupo Polo e QM apresentaram melhores valores quando analisadas as variáveis de função cardíaca. A atividade física mais intensa desempenhada pelos animais do grupo QM e Polo permitiu melhor desenvolvimento funcional do coração destes animais, tendo o grupo PSI, apresentado valores que sugerem que sua capacidade aeróbica ainda pode ser melhor explorada através de melhor orientação de seu treinamento físico.

  2. ANÁLISIS DE LA CALIDAD DEL REGISTRO DE PARO CARDÍACO EN CASOS DE RESPONSABILIDAD MÉDICO LEGAL EN MÉDICOS GENERALES, 1999-2007

    Directory of Open Access Journals (Sweden)

    Gabriel Barragán

    2009-01-01

    Full Text Available Antecedentes. El registro del paro cardíaco es una actividad que se debe acompañar en la reanimación cerebro cardio pulmonar. En Colombia no existe un formato de registro oficial de paro cardiorrespiratorio, lo que dificulta la investigación en reanimación y la conducción de los procesos de responsabilidad médica que se deriven de esta atención. Objetivo. Analizar la calidad del registro de paro cardíaco en casos de responsabilidad médico legal iniciada a médicos generales que tuvieron asesoría científica del Fondo para Auxilio de Demandas de la Sociedad Colombiana de Anestesiología y Reanimación (SCARE-FEPASDE, 1999-2007. Material y métodos. Se realizó una investigación tipo serie de casos, en donde se incluyeron los casos de paro cardiorrespiratorio que tuvieron demanda médico legal y que fueron atendidos por médicos generales, entre 1999 y 2007, y que requirieron asesoría jurídica por SCARE-FEPASDE. La información se registró en tablas de Excel®, según las recomendaciones Utstein. La calificación de calidad se hizo por tres médicos expertos en responsabilidad médica de manera independiente. Se utilizó un formato de calificación sobre la proporción de registros realizados sobre 25 ítem posibles. La calidad se consideró alta (mayor de 95% ítem, media (70-94% ítem y baja (menor de 70%. En los casos de desacuerdo se realizó consenso. Resultados. Se incluyeron en total 83 casos. La calidad del registro del paro fue media en 49 casos (59%, baja en 32 casos (39% y alta en dos casos. Conclusión. El registro de paro cardiorrespiratorio en casos de responsabilidad médica es de mediana calidad, por lo que no se alcanza a cumplir con los estándares internacionales y las guías al estilo Utstein.

  3. Vasculites e eosinófilos em biópsia endomiocárdica, como preditores de rejeição em transplante cardíaco

    Directory of Open Access Journals (Sweden)

    Reginaldo Cipullo

    2011-08-01

    Full Text Available FUNDAMENTO: O significado clínico de vasculites, lesões isquêmicas, efeito Quilty e da presença de eosinófilos em biópsias endomiocárdicas de receptores de transplante cardíaco com rejeições leves não foi ainda estabelecido. OBJETIVO: Verificar se esses achados histológicos encontrados nas biópsias endomiocárdicas (eosinófilos, vasculites, efeito Quilty e lesões isquêmicas são capazes de predizer rejeição aguda do enxerto. MÉTODOS: Foram reavaliadas 1.012 biópsias endomiocárdicas consecutivas; dessas, 939 foram classificadas como OR ou 1R pela Nomenclatura da Sociedade Internacional de Transplante de Coração e Pulmão de 2005, e divididas em dois grupos: (1 Biópsias preditoras: aquelas que precederam rejeição aguda; e (2 Biópsias não preditoras: aquelas que não precederam rejeição aguda. Comparamos a ocorrência dos seguintes achados histológicos: vasculites, lesões isquêmicas, efeito Quilty e eosinófilos por análise uni e multivariada entre os grupos. RESULTADOS: Após análise estatística verificou-se a presença de vasculite intensa e de eosinófilos como maiores preditores para rejeição aguda futura, apresentando respectivamente as seguintes razões de chance: 10,60 (IC95%: 3,62 - 31,06. p < 0,001 e 6,26 (IC95%: 3,16 - 12,43. p < 0,001. CONCLUSÃO: Vasculites intensas e eosinófilos em biópsias do miocárdio são os principais fatores preditores de rejeição aguda pós-transplante cardíaco.

  4. Aplicación de un algoritmo ACO al problema de taller de flujo de permutación con tiempos de preparación dependientes de la secuencia y minimización de makespan An ant colony algorithm for the permutation flowshop with sequence dependent setup times and makespan minimization

    Directory of Open Access Journals (Sweden)

    Eduardo Salazar Hornig

    2011-08-01

    Full Text Available En este trabajo se estudió el problema de secuenciamiento de trabajos en el taller de flujo de permutación con tiempos de preparación dependientes de la secuencia y minimización de makespan. Para ello se propuso un algoritmo de optimización mediante colonia de hormigas (ACO, llevando el problema original a una estructura semejante al problema del vendedor viajero TSP (Traveling Salesman Problem asimétrico, utilizado para su evaluación problemas propuestos en la literatura y se compara con una adaptación de la heurística NEH (Nawaz-Enscore-Ham. Posteriormente se aplica una búsqueda en vecindad a la solución obtenida tanto por ACO como NEH.This paper studied the permutation flowshop with sequence dependent setup times and makespan minimization. An ant colony algorithm which turns the original problem into an asymmetric TSP (Traveling Salesman Problem structure is presented, and applied to problems proposed in the literature and is compared with an adaptation of the NEH heuristic. Subsequently a neighborhood search was applied to the solution obtained by the ACO algorithm and the NEH heuristic.

  5. Fisiopatologia da Dispneia em doentes cardíacos com Congestão Pulmonar** Trabalbo vencedor ex-aqueo do Prémio Thomé Villar/Boehringer Ingelheim, 1995

    Directory of Open Access Journals (Sweden)

    Miguel Mota Carmo

    1997-03-01

    Full Text Available SUMÁRIO: O objectivo deste estudo foi avaliar a importância da comparticipação das alterações do controlo da ventilaçõe da força dos músculos respiratórios na génese da dispneia em doentes cardíacos com estase pulmonar. Para isso comparámos 48 doentes (GI, com uma idade média de 61 anos e uma pressão capilar pulmonar (PCP de 19,9 mmHg, com um grupo de 35 controlos (GII, com uma idade média de 62 anos. Foram efectuadas as seguintes avaliações: volumes e capacidades pulmonares pelo método de diluição do hétio e por pneumotacografia, pressão de oclusão e resposta ventilatória em hipercánia, bem como a quantificação simultânea da dispneia utilizando uma escala visual analógica. Foram também medidas as pressões máximas dos músculos respiratórios, ao nível da boca, em repouso. Os doentes cardíacos foram submetidos a cateterismo cardíaco direito com determinação do débito cardíaco por termodilui determinação. Nestes doentes encontrou-se um aumento da pressão de oclusão basal em comparação com o grupo controlo (P0,1 GI-1,7 cmH20 / GII -1,35 cmH20; p<0,001, provavelmente devido ao padrão espirométrico restritivo que apresentavam. Não se detectaram alterações na variação da P0,1 durante a prova de hiperclápnia pelo que admitimos que o controlo central da ventilação se encontrava integro. Durante esta prova e para um mesmo aumento da ventilação, os doentes cardiacos apresentaram um maior grau de dispneia. A redução das pressões máximas respiratórias, bem como o aumento da “drive” respiratória em repouso, poderão estar implicadas na génese da dispneia oeste grupo de doentes. ABSTRACT: The purpose of this study was to evaluate whether pulmonary congestion (PC in cardiac patients may induce changes in the control of breathing or in the

  6. Avaliação da doença vascular do enxerto no transplante cardíaco: experiência de um centro brasileiro Assessment of cardiac allograft vasculopathy in cardiac transplantation: experience of a Brazilian center

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    Elide Sbardellotto Mariano da Costa

    2012-10-01

    Full Text Available FUNDAMENTO: O transplante cardíaco continua sendo o tratamento de escolha para a insuficiência cardíaca refratária ao tratamento otimizado. Dois métodos diagnósticos apresentam elevada sensibilidade no diagnóstico de episódios de rejeição ao enxerto e Doença Vascular do Enxerto (DVE, causas importantes de mortalidade no pós-transplante. OBJETIVO: Avaliar a relação entre os resultados do ultrassom intracoronariano (USIV e os laudos das biópsias endomiocárdicas (BX no seguimento de pacientes submetidos a transplante cardíaco em um serviço de referência brasileiro. MÉTODOS: Foi realizado um ensaio epidemiológico retrospectivo observacional, com pacientes submetidos a transplante cardíaco ortotópico, no período de 2000 a 2009. Foram analisados os prontuários desses pacientes e os resultados dos USIV e BX realizados rotineiramente no seguimento clínico pós-transplante e terapêutica em uso. RESULTADOS: Dos 77 pacientes analisados, 63,63% são do sexo masculino, nas faixas etárias de 22 a 69 anos. Quanto aos resultados dos USIV, 33,96% foram classificados em Stanford classe I, e 32,08%, como Stanford IV. Dos 143 laudos das biópsias, 51,08% tiveram resultado 1R, 3R em 0,69% dos laudos, e 14,48% apresentaram a descrição de efeito Quilty. Todos usaram antiproliferativos, 80,51% usaram inibidores da calcineurina e 19,48% usaram inibidores do sinal de proliferação (ISP. CONCLUSÃO: A avaliação dos pacientes pós-transplante cardíaco por meio do USIV incorpora informações detalhadas para o diagnóstico precoce e sensível da DVE, que são complementadas pelas informações histológicas fornecidas pelas BX, estabelecendo uma possível relação causal entre a DVE e os episódios de rejeição humoral.BACKGROUND: Cardiac transplantation continues to be the treatment of choice for heart failure refractory to optimized treatment. Two methods have high sensitivity for diagnosing allograft rejection episodes and cardiac

  7. Transplante cardíaco com anastomose bicaval e anuloplastia tricúspide profilática no enxerto Cardiac transplantation with bicaval anastomosis and prophylactic graft tricuspid annuloplasty

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    Alfredo Inácio Fiorelli

    2008-03-01

    Full Text Available OBJETIVO: O presente estudo tem por objetivo avaliar os efeitos da anuloplastia tricúspide profilática no coração doador em transplante cardíaco com anastomose bicaval. MÉTODOS: De 2002 a 2005, foram selecionados de forma não aleatória 20 pacientes submetidos ao transplante cardíaco pela técnica bicaval e com sobrevida superior a seis meses. Eles foram divididos em dois grupos: Grupo I - 10 pacientes que receberam coração doador com anuloplastia tricúspide profilática, pela técnica de De Vega; e Grupo II - 10 pacientes que não receberam a anuloplastia, ambos com características semelhantes. O grau de regurgitação tricúspide foi avaliado pela ecocardiografia transtorácica com Doppler e foi quantificado entre 0 e 3 (0=ausente, 1=discreto, 2=moderado, 3=grave. O desempenho miocárdico foi avaliado pela fração de ejeção ventricular e pelo estudo hemodinâmico invasivo, durante as biópsias endomiocárdicas de rotina. RESULTADOS: O período médio de observação foi de 14,6±4,3 meses (6 e 16 meses. Houve apenas um óbito no grupo II não relacionado à anuloplastia. O grau médio de regurgitação tricúspide no Grupo I foi de 0,4±0,6 e no Grupo II foi de 1,6±0,8 (p OBJECTIVE: This study aims to evaluate the effects of prophylactic heart donor tricuspid annuloplasty in patients after heart transplantation with bicaval anastomosis. METHODS: From 2002 to 2005, 20 patients undergoing heart transplantation with bicaval anastomosis and with a survival rate over 6 months were deliberately selected. Patients were divided into two groups: Group I - 10 patients who underwent prophylactic heart donor tricuspid annuloplasty by the De Vega technique; and Group II - 10 patients did not undergo annuloplasty. In both groups, presurgical clinical characteristics were the same. The tricuspid regurgitation degree was evaluated by transthoracic Doppler echocardiography and it was qualified from 0 to 3 (0=absent, 1=mild, 2=moderated, 3

  8. Sildenafil vs. Nitroprussiato de Sódio durante Teste de Reatividade Pulmonar pré-transplante cardíaco Sildenafil vs. sodium before nitroprusside for the pulmonary hypertension reversibility test before cardiac transplantation

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    Aguinaldo Figueiredo Freitas Jr

    2012-09-01

    Full Text Available FUNDAMENTO: A hipertensão pulmonar é associada ao pior prognóstico no pós-transplante cardíaco. O teste de reatividade pulmonar com Nitroprussiato de Sódio (NPS está associado a elevados índices de hipotensão arterial sistêmica, disfunção ventricular do enxerto transplantado e elevadas taxas de desqualificação para o transplante. OBJETIVO: Neste estudo, objetivou-se comparar os efeitos do Sildenafil (SIL e NPS sobre variáveis hemodinâmicas, neuro-hormonais e ecocardiográficas durante teste de reatividade pulmonar. MÉTODOS: Os pacientes foram submetidos, simultaneamente, ao cateterismo cardíaco direito, ao ecocardiograma e à dosagem de BNP e gasometria venosa, antes e após administração de NPS (1 - 2 µg/Kg/min ou SIL (100 mg, dose única. RESULTADOS: Ambos reduziram a hipertensão pulmonar, porém o nitrato promoveu hipotensão sistêmica significativa (Pressão Arterial Média - PAM: 85,2 vs. 69,8 mmHg, p BACKGROUND: Pulmonary hypertension is associated with a worse prognosis after cardiac transplantation. The pulmonary hypertension reversibility test with sodium nitroprusside (SNP is associated with a high rate of systemic arterial hypotension, ventricular dysfunction of the transplanted graft and high rates of disqualification from transplantation. OBJECTIVE: This study was aimed at comparing the effects of sildenafil (SIL and SNP on hemodynamic, neurohormonal and echocardiographic variables during the pulmonary reversibility test. METHODS: The patients underwent simultaneously right cardiac catheterization, echocardiography, BNP measurement, and venous blood gas analysis before and after receiving either SNP (1 - 2 µg/kg/min or SIL (100 mg, single dose. RESULTS: Both drugs reduced pulmonary hypertension, but SNP caused a significant systemic hypotension (mean blood pressure - MBP: 85.2 vs. 69.8 mm Hg; p < 0.001. Both drugs reduced cardiac dimensions and improved left cardiac function (SNP: 23.5 vs. 24.8%, p = 0

  9. Metastização pulmonar na apresentação de angiossarcoma cardíaco – Caso clínico e discussão

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    Vítor Fonseca

    2009-11-01

    Full Text Available Resumo: Apresenta-se um caso clínico referente a doente de 35 anos, do sexo masculino sem antecedentes pessoais relevantes, admitido no serviço de urgência por quadro de toracalgia e tosse produtiva com alterações electrocardiográficas sugestivas de pericardite. Inicialmente admitido pelo Serviço de Cardiologia, com melhoria do quadro clínico após terapêutica anti-inflamatória; contudo, no internamento houve como intercorrência pneumonia de provável etiologia bacteriana, complicada por derrame pleural. Após a alta, foi referenciado à consulta de pneumologia, onde se manteve o estudo etiológico do derrame persistente, tendo vindo a complicar-se o seu quadro com alterações das cavidades cardiacas e múltiplos nódulos pulmonares, sugestivos de endocardite subaguda com embolização séptica pulmonar. Internado no serviço de Pneumologia e submetido a videotoracoscopia, foi-lhe diagnosticado angiossarcoma cardíaco com metastização pulmonar. Assistiu-se a uma rápida evolução do quadro clínico, quase fulminante, com falência cardíaca e óbito do doente sem ter iniciado radioterapia ou quimioterapia adjuvante.Rev Port Pneumol 2009; XV (6: 1175-1184 Abstract: We present a case report of a 35 year-old male without any relevant former pathology admitted to the emergency room with atypical chest pain, cough and sputum with ECG changes suggesting pericarditis. He was initially admitted to the cardiology ward and experienced clinical improvement after initiating anti-inflammatory treatment. As intercurrence he had bacterial origin pneumonia complicated by pleural effusion (PE. After discharge patient was referred to a pulmonology appointment where aetiological investigation of the PE was instigated. Investigation revealed changes in the cardiac cavities and multiple lung nodules, suggesting subacute endocarditis with septic pulmonary embolism. Admitted to the

  10. Elaboração e caracterização de cookies sem glúten enriquecidos com farinha de coco: uma alternativa para celíacos

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    Ana Maria Queiroz

    2017-05-01

    Full Text Available Resumo Os celíacos encontram dificuldades na adoção de uma dieta totalmente isenta de glúten e com qualidade nutricional. Para tanto, objetivou-se desenvolver e avaliar cookies sem glúten enriquecidos com farinha de coco. A farinha de coco com elevado teor de cinzas, proteínas e lipídios pode ser utilizada para enriquecer produtos alimentícios. Foram elaborados cookies com base na composição de uma mistura da Federação Nacional das Associações de Celíacos do Brasil - Fenacelbra (“mix de farinha preparada II” para cookies sem glúten: Padrão FP (formulação semelhante à composição do “mix de farinha preparada II” da Fenacelbra, F1 (modificação de FP com substituição da fécula de batata por 10% de farinha de coco, F2 (modificação de FP com adição de 5% de farinha de coco, F3 (modificação de FP com substituição do polvilho doce por 5% de farinha de coco. Os cookies foram avaliados quanto às características físicas (peso pós-cocção, diâmetro e espessura pós-cocção, fator de expansão, rendimento, Aw, dureza e cor – L*a*b*, físico-químicas (umidade, cinzas, proteínas, lipídios, carboidratos e valor calórico, aceitabilidade quanto aos atributos sensoriais (aceitação global, aparência, cor, aroma, sabor e textura e atitude de compra. A adição de farinha de coco às formulações melhorou as propriedades nutricionais dos cookies sem glúten, aumentando o teor de lipídios e proteínas, e reduzindo o teor de carboidratos. Os cookies desenvolvidos apresentaram boa aceitação sensorial e intenção de compra satisfatória., A adição de 10% de farinha de coco em substituição da fécula de batata na formulação F1 não alterou as características sensoriais do produto, porém proporcionou propriedades físicas e físico-químicas superiores. Dessa forma, cookies sem glúten enriquecidos com farinha de coco constituem uma alternativa viável de alimentos destinados para pessoas portadoras de

  11. Explanatory digital video disc with patients undergoing diagnostic cardiac catheterization Disco digital explicativo para pacientes sometidos al cateterismo cardiaco diagnóstico Digital video disc explicativo em pacientes submetidos ao cateterismo cardíaco diagnóstico

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    Sabrina Koehler Torrano

    2011-08-01

    ámico.O objetivo deste estudo foi avaliar o conhecimento dos pacientes pré-cateterismo cardíaco com diagnóstico ambulatorial, após digital video disc explicativo, em um hospital de referência em cardiologia. Usou-se o estudo transversal como metodologia, com pacientes submetidos ao primeiro cateterismo cardíaco, realizado de maio a junho de 2009, no setor de hemodinâmica. Foi utilizado instrumento com questões (12 referentes ao entendimento dos pacientes sobre o procedimento. A intervenção foi um vídeo com duração de cinco minutos, elaborado pelos pesquisadores. A amostra foi constituída por 94 pacientes, divididos em grupo intervenção-GI (45 e grupo controle-GC (49, com idade média de 55±9 anos e predominância do sexo masculino. Pacientes do GI apresentaram maior índice de acertos (74,6±17,1, quando comparados ao GC (31,6±18,8, p=0,000. Pode-se concluir, por meio dos resultados, que houve eficácia da apresentação de um vídeo de orientações para pacientes submetidos ao procedimento hemodinâmico.

  12. Impacto da variabilidade de peso na estabilidade metabólica dos pacientes transplantados cardíacos no Ceará Impact of weight variation on the metabolic stability of cardiac transplant patients in the state of Ceara

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    Daniele Maria de Oliveira Carlos

    2008-04-01

    Full Text Available FUNDAMENTO: As alterações de peso após o transplante cardíaco (TC freqüentemente ocorrem e aumentam os riscos de doenças secundárias. OBJETIVO: Determinar o impacto da variabilidade do peso nos níveis séricos de glicose, triglicérides, colesterol total e frações dos pacientes transplantados cardíacos. MÉTODOS: Estudo retrospectivo documental realizado com 82 pacientes adultos submetidos a TC entre outubro de 1997 e dezembro de 2005 no Ceará, sendo 83% do sexo masculino e a idade média de 45,06±12,04 anos. As variáveis estudadas foram o perfil biopatológico, o peso e o índice de massa corporal (IMC relacionadas às alterações bioquímico-metabólicas. Os dados foram descritos usando freqüências, medidas de tendência central, teste t de Student e coeficiente de correlação de Pearson. RESULTADOS: A média global do IMC aumentou de 23,77±3,68kg/m² antes do TC, para 25,48±3,92kg/m² no primeiro ano e para 28,38±4,97kg/m² no quinto. Os pacientes com sobrepeso/obesidade (IMC > 25 kg/m² apresentaram valores médios de glicose, colesterol total, lipoproteína de baixa densidade (LDL e triglicérides maiores que os pacientes com eutrofia/desnutrição (IMC BACKGROUND: Weight alterations post cardiac transplant (CT frequently occur and increase the risks of secondary diseases. OBJECTIVE: This study aimed at determining the impact of weight variability on serum levels of glucose, triglycerides, total cholesterol and its fractions of cardiac transplant patients. METHODS: This was a retrospective documental study held with 82 patients submitted to CT between October, 1997 and December, 2005 in Ceará, Brazil. 83% were male and the average age was 45.06±12.04 years. The studied variables were: biopathology profile, the weight and the body mass index (BMI related to the biochemical-metabolic alterations and to the survival. Data were described using frequencies, measures of central tendency, t-Student test and Pearson

  13. Comparison of the corrosion resistance of DIN W. Nr. 1.4970 (15%Cr-15%Ni-1.2%Mo-Ti and ASTM F-138 (17%Cr-13%Ni-2.5%Mo austenitic stainless steels for biomedical applications

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    Maysa Terada

    2006-09-01

    Full Text Available The resistance to localised corrosion of the full austenitic 15%Cr-15%Ni-1.2%Mo titanium stabilized stainless steel (DIN W. Nr. 1.4970 was investigated by electrochemical methods including electrochemical impedance spectroscopy (EIS, potentiodynamic polarization and potentiostatic polarization measurements in a phosphate-buffered solution (PBS. The low carbon and non-stabilized austenitic stainless steel, AISI 316L (ASTM F-138, widely used for surgical implants, was also tested for comparison. The tests were conducted at room temperature after a stable potential had been reached. After the electrochemical measurements, the surfaces of the specimens were observed using SEM to evaluate the presence of pits. Potentiodynamic polarization results showed that both steels are prone to localized corrosion. Larger pits were found on the surface of AISI 316L specimens after the electrochemical tests. EIS response has indicated the duplex structure of the passive oxides. The results showed that the electrochemical behaviour of the DIN W. Nr. 1.4970 is better than of AISI 316L steel. Therefore, their application as an implant material may be considered.

  14. QUINOA (CHENOPODIUM QUINOA WILLD: DIGESTIBILIDADE IN VITRO, DESENVOLVIMENTO E ANÁLISE SENSORIAL DE PREPARAÇÕES DESTINADAS A PACIENTES CELÍACOS

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    L. I. A. CASTRO

    2008-11-01

    Full Text Available

    A quinoa (Chenopodium quinoa Willd é um pseudocereal isento de glúten, oriundo dos Andes, onde tem sido cultivado há milhares de anos. O objetivo deste trabalho foi desenvolver e avaliar sensorialmente algumas preparações contendo quinoa em grãos, flocos e farinha, destinadas ao paciente celíaco, e determinar a digestibilidade in vitro de sua proteína, submetida ou não ao tratamento térmico. As amostras foram avaliadas sensorialmente através de um teste de aceitação utilizando a escala hedônica nominal de 9 pontos. O método utilizado na análise da digestibilidade protéica in vitro foi o da queda de pH após 10 minutos, com a adição das enzimas tripsina e pancreatina às amostras de quinoa, tratadas e não tratadas termicamente. Das sete preparações testadas, seis foram bem aceitas, já que apresentaram um Índice de Aceitabilidade maior que 70%. Os flocos e grãos de quinoa, após serem testados termicamente, tiveram sua digestibilidade otimizada. Portanto, a quinoa e seus derivados podem ser considerados uma boa opção para a alimentação dos indivíduos portadores da doença celíaca.

  15. Late gadolinium enhancement by magnetic resonance explains adverse cardiac events in individuals with ventricular arrhythmia; Realce tardío con gadolinio por resonancia magnética explica eventos cardíacos adversos en individuos con arritmia ventricular

    Energy Technology Data Exchange (ETDEWEB)

    Courtis, J.; Vasallo, J.; Arabia, L. [Departamento de Imágenes, Cardiología Intervencionista y Electrofisiología Instituto Oulton, Córdoba (Argentina); Dimitroff, M.; Gonzalez, A. [Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Códoba (Argentina); Tibaldi, M., E-mail: javiercourtis@oulton.com.ar [Técnicas no Invasivas y Arritmias, Instituto Modelo de Cardiología, Córdoba (Argentina)

    2012-07-01

    ) predice eventos cardíacos adversos en pacientes con arritmia ventricular. Métodos: se seleccionaron 74 pacientes consecutivos con arritmia ventricular sintomática (extrasístoles ventriculares y taquicardia ventricular) y fracción de eyección del ventrículo izquierdo (FEVI) >55% enviados a RMC para evaluación de cardiopatía estructural no detectada previamente por otros métodos complementarios. Se analizó el RTG, la función sistólica y los volúmenes de ambos ventrículos. En el seguimiento se evaluó un punto final combinado: hospitalización por arritmia ventricular, descarga apropiada de cardiodesfibrilador implantable y muerte cardíaca. Resultados: durante una mediana de seguimiento de 575 días (rango intercuartil 24-1120 días) y al analizar la población según tuvieran (n=9, 12%) o no (n=65, 88%) RTG se observó que el grupo con Gd positivo presentaba una FEVI menor (58% vs. 66% respectivamente, p=0.01) y volúmenes mayores (VTD: 185 ml vs. 123 ml respectivamente, p=0.01 y VTS: 81 ml vs. 42 ml respectivamente, p=0.01) que el otro grupo. Dos (22%) pacientes del grupo RTG positivo vs. 1 (4%) de aquellos sin RTG presentaron el punto final combinado (p=0.01) y al realizar un análisis de regresión logística se halló que el RTG es predictor de los eventos cardíacos adversos analizados (p=0.029). Conclusiones: en esta serie consecutiva de pacientes con arritmia ventricular demostramos una fuerte asociación entre el RTG miocárdico y eventos cardíacos adversos; esto soporta la hipótesis que la fibrosis miocárdica es un importante sustrato arritmogénico. Además, casi la totalidad de los individuos sin RTG estuvieron libres de eventos en el seguimiento sugiriendo que es posible identificar a través de la RMC sujetos de bajo riesgo los cuales pueden ser tratados conservadoramente. (autores)

  16. Evaluation of non-conformities of hip prostheses made of titanium alloys and stainless steel; Avaliacao de nao conformidades de proteses de quadril fabricadas com ligas de titanio e aco inox

    Energy Technology Data Exchange (ETDEWEB)

    Bezerra, Ewerton de Oliveira Teotonio; Nascimento, Jose Jeferson da Silva; Luna, Carlos Bruno Barreto; Morais, Crislene Rodrigues da Silva; Campos, Karla Valeria Miranda de, E-mail: ewerton.teotonio@hotmail.com, E-mail: brunobarretodemaufcg@hotmail.com [Universidade Federal de Campina Grande (UAEMa/CCT/UFCG), PB (Brazil). Unidade Academinca de Engenharia de Materiais

    2017-01-15

    A large number of metallic alloys has satisfactory behavior when used to manufacture implants for hip prostheses. However, they must be in conformity with standards, to ensure their quality for long periods without losing its functionality. Therefore, this paper aims to study the non-conformities in two hip prostheses, one of titanium and other stainless steel according to standards. The implants studied passed by X-ray diffraction (XRD), X-ray fluorescence, tensile test and optical microscopy (OM). Specimens for the tensile test were made according to ASTM E 8M, as well, MO samples passed by metallographic procedure. The results evidenced that some chemical compositions showed in relation to the standards. The XRD analysis showed peaks of austenite and absence of ferrite for the stainless steel, while the titanium alloy presents an alpha phase (HCP) more significant than the beta phase (BCC). The stainless steel alloys and titanium have yield strength and tensile strength that meet the standards. On the other hand, the elastic modulus of the titanium alloy and stainless steel, comes to be ten times greater than the human bone. Therefore, the high modulus of elasticity of the alloys, favors bone resorption problems. The stainless steel microstructure is typical of an austenitic matrix, while the titanium alloy presents α + β microstructure. (author)

  17. Study of residual stresses generated in P91 pipe steel welded by MCAW / FCAW processes; Estudo das tensoes residuais geradas na soldagem de tubulacao de aco P91 pelos processos MCAW/FCAW

    Energy Technology Data Exchange (ETDEWEB)

    Chuvas, Tatiane C.; Pardal, Juan M.; Garcia, Pedro P.; Souza, Guttemberg C. de; Fonseca, Maria P. Cindra, E-mail: chuvas@vm.uff.br [Universidade Federal Fluminense (PGMEC/UFF), Niteroi, RJ (Brazil). Departamento de Engenharia Mecanica; Cardote, Ismael [UTC Engenharia S/A, Niteroi, Rio de Janeiro, RJ (Brazil)

    2014-07-01

    The welding is one of the main industrial manufacturing processes structures and piping, knowledge of residual stress from this process is of paramount importance because the mechanical properties of welded components are not only determined by the microstructures present in the joint, but also by residual stresses heterogeneous introduced by thermal cycling during the process. The aim of this work is the characterization ASTM P91 joints welded by MCAW / FCAW (Metal Cored Arc Welding / Flux Cored Arc Welding) processes through the residual stresses evaluating associated with welding and post-weld heat treatments. Residual stresses were measured using X-rays diffraction sin2psi method, with Crκα radiation and they presented tensile at the root joints with larger magnitudes in the weld metal region and compressive on the surface. The post weld heat treatment resulted relief of residual stresses at the root of the joints. However, the same effect was observed in compressive surface stresses, which could adversely affect the service life of the pipe, reducing the fatigue and stress corrosion cracking resistances. (author)

  18. Avaliação da qualidade de vida e mortalidade em pacientes com eventos cardíacos graves no pós-operatório Evaluación de la calidad de vida y de la mortalidad en pacientes con eventos cardíacos mayores en el postoperatorio Quality of life and mortality assessment in patients with major cardiac events in the postoperative period

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    Fernando José Abelha

    2010-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Complicações cardiovasculares no pós-operatório associam-se a elevadas mortalidade e morbidade. Poucos estudos avaliaram o grau de dependência desses doentes e a percepção da sua saúde. O objetivo deste trabalho foi avaliar a mortalidade e a qualidade de vida em doentes que desenvolveram eventos cardíacos graves (EC no pós-operatório. MÉTODO: Estudo retrospectivo numa Unidade de Tratamento Intensivo Cirúrgica (UTI-Cirúrgica, entre março de 2006 e março de 2008. Os doen tes foram avaliados quanto à ocorrência de EC. Seis meses após a alta, foi preenchido o questionário Short-Form-36 (SF-36 e avaliada a dependência nas atividades da vida diária (AVD. As comparações entre grupos independentes de doentes foram efetuadas com teste t de Student. A comparação entre cada variável e a ocorrência de EC foi efetuada por regressão logística envolvendo todos os doentes. RESULTADOS: Dos 1.280 doentes que apresentaram critérios de inclusão, 26 (2% desenvolveram EC. A análise univariada identificou como determinantes independentes para o desenvolvimento de EC: estado físico ASA, hipertensão arterial, doença cardíaca isquêmica, doença cardíaca congestiva e escore do Índice de Risco Cardíaco Revisado. A mortalidade seis meses após alta da UTI-Cirúrgica foi de 35%. Dos 17 sobreviventes aos seis meses, 13 completaram os questionários. Trinta e um por cento referiram que sua saúde em geral era melhor no dia em que responderam ao questionário do que 12 meses antes. Sessenta e nove por cento dos doentes estavam dependentes nas AVD instrumentais e 15%, nas AVD pessoais. CONCLUSÕES: O desenvolvimento de EC tem sério impacto no tempo de hospitalização e nas taxas de mortalidade. Seis meses após a alta da UTI-Cirúrgica, mais de metade dos doentes estavam dependentes em pelo menos uma AVD instrumental.JUSTIFICATIVA Y OBJETIVOS: Las complicaciones cardiovasculares en el postoperatorio est

  19. Comparação entre a medida contínua do débito cardíaco e por termodiluição em bolus durante a revascularização miocárdica sem circulação extracorpórea

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    Kim Sílvia M.

    2004-01-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A cirurgia de revascularização miocárdica sem o uso de circulação extracorpórea (CEC relaciona-se a importantes alterações hemodinâmicas bruscas, que podem não ser prontamente detectadas pela medida contínua de débito cardíaco. Este estudo compara resultados obtidos pela medida do índice cardíaco com o cateter de artéria pulmonar com filamento térmico (Baxter Edwards Critical Care, Irvine, CA com o método padrão por termodiluição com solução, durante a anastomose coronariana distal. MÉTODO: Dez pacientes submetidos à cirurgia de revascularização miocárdica sem CEC foram monitorizados com o cateter de artéria pulmonar com filamento térmico. As medidas de índice cardíaco foram obtidas em quatro momentos: no início da anestesia, enquanto o tórax ainda estava fechado (M1, após a esternotomia (M2, após a estabilização do coração com o aparelho octopus (M3 e ao final da anastomose coronariana distal (M4. RESULTADOS: Houve diminuição significativa (p < 0,05 do índice cardíaco durante a anastomose coronariana, detectada pela medida com termodiluição com bolus de solução. O índice cardíaco variou de 2,8 ± 0,7 para 2,3 ± 0,8 l.min.m-2 no início da anastomose e 2,5 ± 0,8 l.min.m-2 ao final da mesma. Essa variação não foi detectada pela medida contínua (de 3 ± 0,6 para 3,2 ± 0,5 e 3,1 ± 0,6 l.min.m-2 durante a anastomose coronariana. CONCLUSÕES: A medida de débito cardíaco contínuo utilizando o cateter de artéria pulmonar com filamento térmico apresentou atraso na detecção das alterações hemodinâmicas agudas relacionadas à mudança do posicionamento do coração na cirurgia de revascularização miocárdica sem CEC.

  20. Estudo de Procedimentos de Soldagem MIG/MAG para Aplicação de Revestimentos de Liga de Níquel Inconel 625 em Aço Estrutural ASTM A387 Gr.11

    Directory of Open Access Journals (Sweden)

    Nathália Escóssio Cavalcante

    2016-03-01

    Full Text Available Resumo O presente trabalho objetiva o estudo de técnicas de soldagem aplicadas a reparo de componentes fabricados em aço ASTM A387 Gr.11, largamente utilizado em aplicações da indústria do petróleo e gás. Devido ao regime de trabalho e necessidade de utilização de materiais com boa resistência mecânica e à corrosão, utilizou-se como metal de adição a liga UNS N06625 (Inconel 625. O processo de soldagem utilizado foi o MIG/MAG e a técnica de soldagem aplicada foi a dupla camada. A metodologia do presente trabalho foi dividida em etapas, sendo a primeira a realização de ensaios exploratórios para definir a relevância dos fatores de controle estudados. A segunda etapa consistiu na aplicação do critério de dureza e de microestrutura para definir as melhores relações de energia para aplicação da técnica da dupla camada. A técnica da dupla camada se mostrou eficaz na melhora das propriedades da microestrutura da ZAC-GG dos revestimentos, verificou-se intenso refinamento de grão. Houve também redução nas medidas de dureza e microdureza. Para ambos os gases de proteção utilizados (Ar+25%He e Ar+4%CO2 foi possível obter relações de energia com afastamentos positivos. Em todas essas relações a energia da segunda camada foi maior que a energia da primeira camada.

  1. Quality-by-design (QbD): effects of testing parameters and formulation variables on the segregation tendency of pharmaceutical powder measured by the ASTM D 6940-04 segregation tester.

    Science.gov (United States)

    Xie, Lin; Wu, Huiquan; Shen, Meiyu; Augsburger, Larry L; Lyon, Robbe C; Khan, Mansoor A; Hussain, Ajaz S; Hoag, Stephen W

    2008-10-01

    The objective of this study was to examine the effects of testing parameters and formulation variables on the segregation tendency of pharmaceutical powders measured by the ASTM D 6940-04 segregation tester using design of experiments (DOE) approaches. The test blends consisted of 4% aspirin (ASP) and 96% microcrystalline cellulose (MCC) with and without magnesium stearate (MgS). The segregation tendency of a blend was determined by measuring the last/first (L/F) ratio, the ratio of aspirin concentrations between the first and last samples discharged from the tester. A 2(2) factorial design was used to determine the effects of measurement parameters [amount of material loaded (W), number of segregation cycles] with number of replicates 6. ANOVA showed that W was a critical parameter for segregation testing. The L/F value deviated further from 1 (greater segregation tendency) with increasing W. A 2(3) full factorial design was used to assess the effects of formulation variables: grade of ASP (unmilled, milled), grade of MCC, and amount of lubricant, MgS. MLR and ANOVA showed that the grade of ASP was the main effect contributing to segregation tendency. Principal Component Regression Analysis established a correlation between L/F and the physical properties of the blend related to ASP and MCC, the ASP/MCC particle size ratio (PSR) and powder cohesion. The physical properties of the blend related to density and flow were not influenced by the grade of ASP and were not related to the segregation tendency of the blend. The direct relationship between L/F and PSR was determined by univariate analysis. Segregation tendency increased as the ASP to MCC particle size increased. This study highlighted critical test parameters for segregation testing and identified critical physical properties of the blends that influence segregation tendency. (c) 2008 Wiley-Liss, Inc. and the American Pharmacists Association

  2. Psychologiczne aspekty chorób alergicznych: trudności dorosłych pacjentów z astmą oskrzelową i atopowym zapaleniem skóry

    Directory of Open Access Journals (Sweden)

    Paulina Albińska

    2014-12-01

    Full Text Available Celem pracy jest zaprezentowanie przeglądu badań na temat psychologicznego funkcjonowania dorosłych cierpiących na choroby alergiczne. Artykuł koncentruje się na dorosłych ze względu na istnienie małej liczby prac naukowych dotyczących zmiany manifestacji symptomów u pacjentów z wyżej wymienionymi chorobami, która może być traktowana jako pierwsze i ostatnie stadium marszu alergicznego, ponieważ jego objawowa manifestacja u dzieci zwykle przybiera postać atopowego zapalenia skóry, podczas gdy u dorosłych jest znana jako astma oskrzelowa. Analiza odpowiada na pytanie, czy wspólnej, alergiczno-zapalnej etiologii tych schorzeń odpowiadają podobieństwa doświadczanych trudności psychologicznych. Omówienie odwołuje się do polskiej i zagranicznej literatury przedmiotu i uwzględnia kluczowe aspekty chorób psychosomatycznych – astmy i atopowego zapalenia skóry – czyli trudności ze snem, depresję, lęk, inne zaburzenia afektywne, zaburzenia zachowania i trudności poznawcze. Współwystępowanie zaburzeń psychicznych i somatycznych u chorych na alergię to niepodważalny dowód integralności somy i psyche, co rzadko dostrzegają osoby odpowiedzialne za system opieki zdrowotnej. Ignorują one tym samym ważny element procesu diagnostyczno-terapeutycznego, istotny dla wyzdrowienia pacjentów z astmą i atopowym zapaleniem skóry.

  3. Técnica para correção de truncus arteriosus tipos I e II sem condutos extracardíacos Technique for correction of truncus arteriosus type I and II without extracardiac conduits

    Directory of Open Access Journals (Sweden)

    Miguel Barbero-Marcial

    1989-04-01

    Full Text Available Uma nova técnica para correção cirúrgica do truncus arteriosus (TA sem o uso de conduto extracardíaco foi realizada em 7 pacientes, senão 6 do tipo I, e do tipo II em 1 paciente; a idade variou de 2 a 9 meses. O tronco comum foi septado com retalho, dividindo-o em uma posição aórtica e outra pulmonar; a comunicação interventricular (CIV foi fechada através de ventriculotomia; anastomose direta entre as artérias pulmonares e o ventrículo direito foi realizada, sendo a parede anterior construída com retalho de pericárdio bovino com válvula monocúspide. Houve apenas 1 óbito no pós-operatório. Nos 6 pacientes restantes, a relação entre as pressões sistólicas ventrículo direito/ventrículo esquerdo (VD/VE foi menor que 0,51 em 5 pacientes; em 1 paciente, essa relação foi de 0,60, associada a CIV residual. Todos os pacientes encontram-se em classe funcional I (NYHA, em um período de 1 a 14 meses de pós-operatório. Baseados nestes resultados, propomos esta técnica para pacientes com TA tipo I ou II, no primeiro ano de vida.A new corrective surgery for truncus arteriosus (TA without the use of extracardiac conduit was employed in 7 patients with truncus (TA type I in 6 cases and type II in 1 case, aged from two to nine months. The common TA was septated with a patch into aortic and pulmonary segments and the ventricular septal defect was closed through ventriculotomy; a direct anastomosis between the pulmonary arteries and the right ventricle was performed, the anterior wall of this, being contructed with a patch with a monocusp valve. There was one imediate postoperative death. In the surviving six patients the RV/LV postoperative peak systolic was less than 0.51 in five and 0.60 in one with residual VSD; all are in functional class I, in postoperative period between one and fourteen months. Based in these results we propose this technique for patients with type I or II, in the first year of life.

  4. Uso de fluorescência em um método de dissector modificado para estimar o número de miócitos no tecido cardíaco

    Directory of Open Access Journals (Sweden)

    Rômulo Dias Novaes

    2012-03-01

    Full Text Available FUNDAMENTO: Métodos convencionais de dissector atualmente requerem consideráveis custos financeiros, técnicos e operacionais para estimar o número de células, incluindo cardiomiócitos, em uma área de 3D. OBJETIVO: Usar a microscopia de fluorescência em um método de dissector modificado para determinar o número de miócitos no tecido cardíaco em condições normais e patológicas. MÉTODOS: O estudo empregou camundongos Wistar machos com quatro meses de idade e peso de 366,25 ± 88,21 g randomizados em grupos controles (GC, n = 8 e infectados (GI, n = 8. Os animais do GI foram inoculados com cepa Y de T. cruzi (300.000 tripomastigotas/50 g. Após oito semanas, os animais foram pesados e sacrificados. Os Ventrículos Esquerdos (VE foram removidos para análise estereológica da densidade numérica de cardiomiócitos (Nv [c] e o número total dessas células no VE (N [c]. Esses parâmetros foram estimados usando um dissector fluorescente (DF e comparados com os métodos convencionais de dissector óptico (DO e dissector físico (DFi. RESULTADOS: Em ambos os métodos de dissector, os animais do GI apresentaram queda significativa de Nv[c] e N[c] em comparação com os animais do GC (P > 0,05. Uma correlação forte, igual ou superior a 96%, foi obtida entre DF, DO e DFi. CONCLUSÃO: O método DF parece ser igualmente confiável para determinar Nv[c] e N[c] em condições normais e patológicas, apresentando algumas vantagens em relação aos métodos convencionais de dissector: redução de cortes histológicos e imagens na análise estereológica, redução do tempo de análise das imagens, a construção de DF em microscópios simples, utilizando o modo de epifluorescência, distinção de planos de dissector em ampliações inferiores.

  5. Análise histomorfométrica dos cardiomiócitos e deposição de colágeno no músculo cardíaco de ratas ooforectomizadas

    Directory of Open Access Journals (Sweden)

    Maria C.R. Silva

    2016-03-01

    Full Text Available Resumo: Esse estudo objetivou avaliar o efeito da ooforectomia sob os parâmetros histomorfométricos dos cardiomiócitos e quantificação de colágeno em ratas Wistar. Vinte ratas foram utilizadas e separadas em dois grupos: GI - ooforectomizada e GII - sham-ooforectomizada. Após a recuperação anestésica os animais foram acomodados em gaiolas e separados nas condições de ciclo claro/escuro 12/12h por um período de 6 meses. Passado o período experimental, os animais foram anestesiados, o coração retirado e mergulhado em formaldeído a 10%. Os fragmentos dos ventrículos foram submetidos ao processamento histológico e corados com hematoxilina e eosina. As análises histomorfométricas (área celular e área e volume nuclear foram realizadas pelo microscópio de luz e software ImageJ versão 1.44. Os dados foram submetidos à análise ANOVA e quando significantes, complementados pelo teste t de student (p<0,001. Observou-se uma diminuição significativa das áreas celular e nuclear dos cardiomiócitos do grupo GI quando comparado ao grupo GII, bem como a área ocupada, pelo colágeno, no músculo cardíaco foi maior em GI, quando comparado a GII. Diante disso, conclui-se que as alterações observadas nos cardiomiócitos do grupo GI, sugerem uma maior atividade apoptótica nesse grupo, devido à diminuição dos níveis séricos do estrógeno provocado pela ooforectomia e o aumento da área ocupada pelo colágeno, no grupo ooforectomizado, está associada ao efeito cardioprotetor do estrógeno.

  6. Sevoflurano e desflurano sobre o ritmo cardíaco de cães tratados com infusão contínua de doses crescentes de adrenalina

    Directory of Open Access Journals (Sweden)

    Nunes Newton

    2004-01-01

    Full Text Available Os anestésicos inalatórios sensibilizam o miocárdio ou seu sistema de condução à ação das catecolaminas endógenas e/ou exógenas, predispondo o animal às arritmias cardíacas. Dentre os anestésicos voláteis, o sevoflurano e o desflurano são fármacos relativamente recentes e, embora sejam dotados de características relacionadas a não sensibilização do miocárdio às catecolaminas, desconhecem-se estudos que comparem suas eventuais propriedades antiarritmogênicas. Com o objetivo de estudar, comparativamente, o comportamento do ritmo cardíaco e observar eventuais bloqueios atrioventriculares em cães anestesiados pelo sevoflurano e desflurano e submetidos à infusão contínua de adrenalina, foram utilizados 20 animais adultos, os quais foram separados em dois grupos de igual número (G1 e G2. Aos cães do G1, foi administrado propofol, na dose média de 10mmg.kg-1; em seguida os animais receberam sevoflurano, a 1,5CAM. Decorridos 30 minutos do início da administração do anestésico volátil, iniciou-se a infusão de adrenalina na dose de 1mmg.kg-1.min-1. A cada 10 minutos, a dose da catecolamina foi acrescida em uma unidade, cessando-se a administração em 6mmg.kg-1.min-1. Para o G2, empregou-se a mesma metodologia, substituindo-se o sevoflurano pelo desflurano, administrado a 1,5CAM. A cada dose de adrenalina, foi feita contagem de batimentos ventriculares ectópicos, bem como a observação de bloqueios atrioventriculares. Os achados foram tratados pelos métodos estatísticos de Análise de Perfil e Kruskall-Wallis. Os resultados permitiram concluir que o desflurano minimiza de maneira mais eficiente a arritmia induzida pela adrenalina, além de reduzir a incidência de bloqueios atrioventriculares.

  7. Study of corrosion resistance of AISI 444 ferritic stainless steel for application as a biomaterial; Estudo da resistencia a corrosao do aco inoxidavel ferritico AISI 444 para aplicacao como biomaterial

    Energy Technology Data Exchange (ETDEWEB)

    Marques, Rogerio Albuquerque

    2014-09-01

    Ferritic stainless steels are ferromagnetic materials. This property does not allow their use in orthopedic prosthesis. Nevertheless, in some specific applications, this characteristic is very useful, such as, for fixing dental and facial prostheses by using magnetic attachments. In this study, the corrosion resistance and cytotoxicity of the AISI 444 ferritic stainless steel, with low nickel content, extra-low interstitial levels (C and N) and Ti and Nb stabilizers, were investigated for magnetic dental attachments application. The ISO 5832-1 (ASTM F-139) austenitic stainless steel and a commercial universal keeper for dental attachment (Neo-magnet System) were evaluated for comparison reasons. The first stainless steel is the most used metallic material for prostheses, and the second one, is a ferromagnetic keeper for dental prostheses (NeoM). In vitro cytotoxicity analysis was performed by the red neutral incorporation method. The results showed that the AISI 444 stainless steel is non cytotoxic. The corrosion resistance was studied by anodic polarization methods and electrochemical impedance spectroscopy (EIS), in a saline phosphate buffered solution (PBS) at 37 °C. The electronic properties of the passive film formed on AISI 444 SS were evaluated by the Mott-Schottky approach. All tested materials showed passivity in the PBS medium and the passive oxide film presented a duplex nature. The highest susceptibility to pitting corrosion was associated to the NeoM SS. This steel was also associated to the highest dopant concentration. The comparatively low levels of chromium (nearly 12.5%) and molybdenum (0.3%) of NeoM relatively to the other studied stainless steels are the probable cause of its lower corrosion resistance. The NeoM chemical composition does not match that of the SUS444 standards. The AISI 444 SS pitting resistance was equivalent to the ISO 5832-1 pointing out that it is a potential candidate for replacement of commercial ferromagnetic alloys used

  8. Influência da refusão por plasma na microestrutura de um revestimento Fe-Mn-Cr-Si depositado por aspersão térmica arco elétrico sobre aço inoxidável ASTM A743-CA6NM Influence of plasma remelting on the microstructure of Fe-Mn-Cr-Si arc thermal spray coating deposited on ASTM A743-CA6NM stainless steel

    Directory of Open Access Journals (Sweden)

    Anderson Geraldo Marenda Pukasiewicz

    2012-03-01

    Full Text Available ASTM A743-CA6NM é um aço inoxidável martensítico muito utilizado na fabricação de turbinas hidráulicas devido a sua elevada tenacidade, entretanto apresenta restrições com relação à regiões recuperadas por soldagem. Diferentes técnicas de deposição tem sido aplicadas com o intuito de reduzir ou eliminar a tensão residual. A deposição de revestimentos resistentes a cavitação é outra forma importante de aumentar a vida útil destes componentes. O objetivo deste trabalho é avaliar a influência do tipo e intensidade de corrente de refusão por plasma na microestrutura, composição química e microdureza de um revestimento Fe-Mn-Cr-Si resistente a cavitação depositado por aspersão térmica arco elétrico sobre aço ASTMA743-CA6NM. Observou-se que a adoção de menores valores de corrente média, assim como a utilização de corrente pulsada reduziram a formação de ferrita δ e a espessura final da ZTA, possibilitando a formação do revestimento com menores alterações na microestrutura do metal base. Verificou-se que a microestrutura e microdureza dos revestimentos refundidos não se mostraram muito sensível a variações na diluição do metal base. A utilização de corrente contínua promoveu um alinhamento da estrutura dendrítica no sentido da movimentação da tocha, entretanto este comportamento não foi observado em revestimentos refundidos com corrente pulsada.ASTM A743-CA6NM martensitic stainless steel have been used in hydraulic turbines manufacturing, but show some restrictions in welded recovered areas. Different techniques have been applied in order to reduce or eliminate residual stress, with life increase. The deposition of cavitation resistant coatings is another important way to increase the service life of these components. The objective of this study is evaluate the influence of type and intensity of plasma remelting current on the microstructure, chemical composition and microhardness of the Fe

  9. Biodiesel Fuel Quality and the ASTM Standard

    Science.gov (United States)

    Biodiesel is usually produced from vegetable oils, animal fats and used cooking oils with alternative feedstocks such as algae receiving increasing interest. The transesterification reaction which produces biodiesel also produces glycerol and proceeds stepwise via mono- and diacylglycerol intermedia...

  10. ASTM Data Banks and Chemical Information Sources

    Science.gov (United States)

    Batik, Albert; Hale, Eleanor

    1972-01-01

    Among the data described are infrared indexes, mass spectral data, chromatographic data, X-ray emmission data, odor and taste threshold data, and thermodynamics data. This paper provides the chemical documentarian a complete reference source to a wide variety of analytical data. (Author/NH)

  11. 1991 annual book of ASTM standards

    International Nuclear Information System (INIS)

    Anon.

    1991-01-01

    This book contains nuclear technology standards also features test methods and practices for solar and geotechnical energy. In the nuclear category, the primary emphasis of this volume is on analysis, dosimetry, and radiation effects in materials. Over eighty standards primarily test methods and practices are featured in this category

  12. Predictive analytics can support the ACO model.

    Science.gov (United States)

    Bradley, Paul

    2012-04-01

    Predictive analytics can be used to rapidly spot hard-to-identify opportunities to better manage care--a key tool in accountable care. When considering analytics models, healthcare providers should: Make value-based care a priority and act on information from analytics models. Create a road map that includes achievable steps, rather than major endeavors. Set long-term expectations and recognize that the effectiveness of an analytics program takes time, unlike revenue cycle initiatives that may show a quick return.

  13. Uso do óxido nítrico inalatório no tratamento da crise hipertensiva pulmonar no pós-operatório de transplante cardíaco

    Directory of Open Access Journals (Sweden)

    Juan Alberto Cosquillo MEJIA

    2002-09-01

    Full Text Available OBJETIVO: Este trabalho relata a experiência no manuseio da crise hipertensiva pulmonar (CHP refratária, com o uso do óxido nítrico inalatório (NOi no pós-operatório imediato do transplante cardíaco (TC ortotópico. MÉTODOS: De outubro/1997 a fevereiro/2002 foram realizados 31 TC em adultos, sendo incluídos pacientes com RVP ±5,1horas.RESULTADOS: Cinco pacientes (1 mulher, com idade média de 42 anos, fizeram uso de NOi por apresentarem critérios de CHP, todos com sinais de baixo débito cardíaco. O tempo médio de CEC foi de 150,8±34,3 minutos, a média sistólica arterial pulmonar foi de 87mmHg (75-115 e a PO2 média de 60mmHg (FiO2 100%, sendo evidenciada dilatação moderada a severa do ventrículo direito no ETT. Foi administrado NOi durante uma média 35h (6-96, iniciando-se desmame após estabilização hemodinâmica. O tempo médio de ME do doador foi de 27,6±5,5horas, a internação hospitalar média foi de 63 dias (17-145, uma morte ocorreu por sepse no 17º PO e os demais pacientes estão em CF I (NYHA. CONCLUSÕES: O tempo de CEC superior a 120 minutos e tempo de ME do doador superior a 20 horas sugerem fatores de risco para CHP no período pós-operatório imediato do TC. O NOi é uma ferramenta útil no manuseio desta complicação, refratária ao tratamento convencional no POI de pacientes submetidos ao TC.OBJECTIVE: This study reviews our experience with the use of nitric oxide inhalation (NOi in the treatment of the refractory pulmonary hypertensive crisis (PHC during the immediate post-operative period (IPOP of heart transplantation (HT. METHOD: Between Oct/97 and Feb/02, 31 HT in adults were performed. Among them were patients with Pulmonary Vascular Resistance (PVR greater than 6 uW, or patients with PVR greater than 2,5 uW during the pharmacological test. All patients were weaned from the CPB (M=101±21 minutes in use of dobutamine, dopamine and milrinone. In the absence of an adequate response to these drugs

  14. Consenso brasileiro de monitorização e suporte hemodinâmico - parte III: métodos alternativos de monitorização do débito cardíaco e da volemia Brazilian consensus of monitoring and hemodynamic support - part III: alternative methods for cardiac output monitoring and volemia estimation

    Directory of Open Access Journals (Sweden)

    Guilherme Schettino

    2006-03-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A interpretação do débito cardíaco e da pré-carga como números absolutos não traz grandes informações sobre a hemodinâmica do paciente crítico. Em contrapartida, a monitorização da resposta do débito cardíaco à expansão volêmica ou suporte inotrópico é uma ferramenta muito útil na unidade de terapia intensiva, quando o paciente apresenta algum sinal de má perfusão tecidual. Apesar do CAP ser considerado como " padrão-ouro" na avaliação destes parâmetros, foram desenvolvidas tecnologias alternativas bastante confiáveis para a sua monitorização. MÉTODO: O processo de desenvolvimento de recomendações utilizou o método Delphi modificado para criar e quantificar o consenso entre os participantes. A AMIB determinou um coordenador para o consenso, o qual escolheu seis especialistas para comporem o comitê consultivo. Outros 18 peritos de diferentes regiões do país foram selecionados para completar o painel de 25 especialistas, médicos e enfermeiros. Um levantamento bibliográfico na MEDLINE de artigos na língua inglesa foi realizado no período de 1966 a 2004. RESULTADOS: Foram apresentadas recomendações referentes à análise da variação da pressão arterial durante ventilação mecânica, débito cardíaco contínuo por contorno de pulso arterial, débito cardíaco por diluição do lítio, Doppler transesofágico, bioimpedância transtorácica, ecocardiografia e reinalação parcial de gás carbônico. CONCLUSÕES: As novas e menos invasivas técnicas para medida do débito cardíaco, pré-carga e fluidoresponsividade apresentam adequada precisão e podem ser uma alternativa ao uso do CAP em pacientes graves.BACKGROUND AND OBJECTIVES: Cardiac output and preload as absolute data do not offer helpful information about the hemodynamic of critically ill patients. However, monitoring the response of these variables to volume challenge or inotropic drugs is a very useful tool in the

  15. Correlação entre gasometria atrial direita e índice cardíaco no pós-operatório de cirurgia cardíaca Correlation between right atrial venous blood gasometry and cardiac index in cardiac surgery postoperative period

    Directory of Open Access Journals (Sweden)

    João Jackson Duarte

    2010-06-01

    Full Text Available OBJETIVO: Determinar a confiabilidade em se correlacionar o índice cardíaco com os dados fornecidos pela gasometria do sangue venoso atrial direito em pacientes submetidos à cirurgia cardíaca, durante o período pós-operatório. MÉTODOS: A partir das amostras de sangue arterial e venoso do átrio direito, colhidas no pós-operatório de cirurgia cardíaca, foram determinados os parâmetros de oxigênio do sangue venoso do átrio direito. Estes parâmetros foram então comparados com o índice cardíaco determinado pela termodiluição. RESULTADOS: Houve boa correlação entre a saturação de oxigênio do sangue venoso do átrio direito (SvO2, diferença artério-venosa do conteúdo de oxigênio do sangue colhido no átrio direito e o índice cardíaco aferido pela termodiluição, com boa sensibilidade e especificidade e alto valor preditivo positivo e negativo. A pressão do sangue do átrio direito (PvO2 apresentou baixa sensibilidade na estimativa de baixo débito cardíaco. CONCLUSÃO: No pós-operatório de cirurgia cardíaca, a SvO2e a diferença artério-venosa do conteúdo de oxigênio (C(avO2 apresentaram-se como parâmetros confiáveis correlacionados a baixo débito cardíaco. A PvO2 foi pouco sensível no diagnóstico de baixo débito no pós-operatório de cirurgia cardíaca.OBJECTIVE: To determine, even during postoperative period, the confiability of the cardiac index correlate with the data data given by a central atrial venous blood gasometry in patients who underwent cardiac surgery. METHODS: From the sample of arterial and venous blood of right atrium gathered in postoperative of cardiac surgery, it was determinated the hemoglobin concentration and the gasometric study through what was observed of the venous oxygen saturation (SvO2 and the partial pressure of oxygen from venous blood gathered in right atrium (PvO2, add to the calculation of artery-venous difference of the oxygen content - radial artery / right atrium (C

  16. [Comparison of susceptibility artifacts generated by microchips with different geometry at 1.5 Tesla magnet resonance imaging. A phantom pilot study referring to the ASTM standard test method F2119-07].

    Science.gov (United States)

    Dengg, S; Kneissl, S

    2013-01-01

    Ferromagnetic material in microchips, used for animal identification, causes local signal increase, signal void or distortion (susceptibility artifact) on MR images. To measure the impact of microchip geometry on the artifact's size, an MRI phantom study was performed. Microchips of the labels Datamars®, Euro-I.D.® and Planet-ID® (n  =  15) were placed consecutively in a phantom and examined with respect to the ASTM Standard Test Method F2119-07 using spin echo (TR 500 ms, TE 20 ms), gradient echo (TR 300 ms, TE 15 ms, flip angel 30°) and otherwise constant imaging parameters (slice thickness 3 mm, field of view 250 x 250 mm, acquisition matrix 256 x 256 pixel, bandwidth 32 kHz) at 1.5 Tesla. Image acquisition was undertaken with a microchip positioned in the x- and z-direction and in each case with a phase-encoding direction in the y- and z-direction. The artifact size was determined with a) a measurement according to the test method F2119-07 using a homogeneous point operation, b) signal intensity measurement according to Matsuura et al. and c) pixel counts in the artifact according to Port and Pomper. There was a significant difference in artifact size between the three microchips tested (Wilcoxon p = 0.032). A two- to three-fold increase in microchip volume generated an up to 76% larger artifact, depending on the sequence type, phase-encoding direction and chip position to B0. The smaller the microchip geometry, the less is the susceptibility artifact. Spin echoes (SE) generated smaller artifacts than gradient echoes (GE). In relation to the spatial measurement of the artifact, the switch in phase-encoding direction had less influence on the artifact size in GE- than in SE-sequences. However, the artifact shape and direction of SE-sequences can be changed by altering the phase. The artifact size, caused by the microchip, plays a major clinical role in the evaluation of MRI from the head, shoulder and neck regions.

  17. Transplante cardíaco em Campo Grande - MS. Redução significativa de lesão coronária pós transplante: relato de caso

    Directory of Open Access Journals (Sweden)

    Marcos Vinícius R. P. CALDAS

    1997-04-01

    Full Text Available No Serviço de Cirurgia Cardíaca da Santa Casa de Campo Grande/MS - foi realizado, em 23 de setembro de 1994, um transplante cardíaco ortotópico no paciente C.A.D., 27 anos, portador de miocardiopatia dilatada idiopática, o qual transcorreu sem anormalidades. O paciente recebeu alta da UTI com 7 dias e alta hospitalar no 40º dia de pós-operatório, recebendo ciclosporina, azatioprina e prednisona para manutenção do enxerto, captopril, furosemida e aspirina. Apresentou no 1º ano de seguimento 2 episódios de rejeição, leve e moderada, sendo modificada a posologia dos imunossupressores. Em setembro de 1995, nos exames de seguimento, foi detectada, na coronariografia, lesão obstrutiva de 50% em artéria coronária direita. Decidiu-se modificar a terapêutica do paciente, iniciando diltiazen substituindo o captopril, e associando-se complexo vitamínico (betacaroteno, C e E mais selênio, na tentativa de evitar progressão da lesão obstrutiva. Foi também realizada orientação dietética por nutricionista. Após 12 meses com a nova terapêutica, a coronariografia mostrou redução significativa da lesão obstrutiva em artéria coronária direita. Durante todo o período de seguimento o paciente apresentou níveis normais no lipidograma. Hoje o paciente encontra-se no terceiro ano de seguimento, assintomático e tendo suas atividades habituais sem intercorrências.The Cardiac Surgery Service of Campo Grande, Santa Casa/MS performed on September 23 rd, 1994 an orthotopic cardiac transplantation in a 27 year-old man with idiopathic dilated cardiomyopathy, which elapsed without abnormalities. The patient left the ICU in 7 days and was discharged at 40 th postoperative day, receiving cyclosporine, azathioprine and prednisone for graft support; captopril, furosemide and aspirin. Presented at one year follow-up, 2 rejection episodes, mil and moderate, when the immunesupressivet herapy dose was modified. On September 1995, at follow up, an

  18. Intervenção coronária percutânea utilizando Full Metal Jacket com stents farmacológicos: eventos cardíacos adversos maiores em um ano

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    Rita Calé

    2013-08-01

    Full Text Available FUNDAMENTO: O benefício clínico de intervenção coronária percutânea (ICP para lesões coronárias longas é incerto; além disso, foram levantadas dúvidas questões sobre a sua segurança. OBJETIVO: Avaliar os preditores de eventos cardíacos adversos maiores (ECAM associados à ICP utilizando Full Metal Jacket (FMJ, definido como a sobreposição de stents farmacológicos (SF medindo >60 mm de comprimento, para lesões muito longas. MÉTODOS: Foram incluídos 136 pacientes consecutivos com lesões coronárias longas, requerendo FMJ em nosso cadastro de centro único. O desfecho primário incluiu a ocorrência combinada de todas as causas de morte, infarto do miocárdio (IM e revascularização do vaso alvo (RVA. Variáveis demográficas, clínicas, angiográficas e de procedimento foram avaliadas por meio de análise de regressão de Cox para determinar os preditores independentes de desfecho. RESULTADOS: O comprimento médio do stent por lesão foi de 73,2 ± 12,3 mm e o diâmetro médio do vaso de referência foi de 2,9 ± 0,6 mm. O sucesso angiográfico foi de 96,3%. A ausência de ECAM foi de 94,9% em 30 dias e 85,3% em um ano. No acompanhamento de um ano, a taxa de mortalidade por todas as causas foi de 3,7% (1,5% por mortes cardíacas, a taxa de IM foi de 3,7%, e a incidência de trombose de stent (TS definitiva ou provável foi de 2,9%. O gênero feminino [risco relativo (RR, 4,40; intervalo de confiança de 95% (IC, 1,81-10,66, p = 0,001 e ICP de artéria coronária não direita (RR, 3,49; p = 0,006; IC 95%, 1,42-8,59 foram preditores independentes de ECAM em um ano. A ausência de eventos adversos em um ano foi maior em pacientes com angina estável submetidos à ICP (RR, 0,33; IC 95% 0,13-0,80, p = 0,014. CONCLUSÕES: A ICP utilizando FMJ com SF para lesões muito longas foi eficaz, mas associada a uma alta taxa de TS em acompanhamento de um ano. No entanto, a taxa de mortalidade cardíaca, IM não relacionado a procedimento, e

  19. Tratamento da Isquemia Mesentérica Crônica através da Angioplastia do Tronco Celíaco: Série de Casos / Treatment of Chronic Mesenteric Ischemia through Celiac Trunk Angioplasty: Case Series

    Directory of Open Access Journals (Sweden)

    Dante Togeiro Bastos Filgueiras

    2016-09-01

    Full Text Available Introdução: A estenose aterosclerótica das artérias viscerais pode ser responsável pela manifestação da Isquemia Mesentérica Crônica (IMC. Apesar de o Tronco Celíaco (TC ser o vaso mais frequentemente acometido, o tratamento cirúrgico é cada vez menos utilizado. O tratamento endovascular, apesar de possuir perviedade inferior a longo prazo, tornou-se o método de escolha devido à fácil execução e baixo índice de complicações. Relato de Casos: Descreve-se quatro casos de revascularização endovascular do TC com implante de stent em pacientes com sintomas de IMC. A avaliação diagnóstica foi realizada através de angioTC helicoidal. Três casos foram realizados por meio do acesso femoral. O sucesso técnico foi de 100%, entretanto um caso necessitou de conversão para acesso braquial. Houve um caso de migração proximal do stent. Todos os pacientes apresentaram melhora subjetiva dos sintomas. Conclusão: Os métodos de imagem são fundamentais para o diagnóstico e planejamento terapêutico. O tratamento endovascular para as lesões estenóticas do TC é o método de escolha na atualidade, devido aos baixos índices de complicações e aceitável taxa de perviedade primária no curto e médio prazo. A aplicação objetiva de questionários de qualidade de vida, entretanto, é necessária para confirmar a eficácia clínica do tratamento. Introduction: Atherosclerotic stenosis of visceral arteries may be responsible for the manifestation of Chronic Mesenteric Ischemia (CMI. Although the Celiac Trunk (CT is the most commonly affected vessel, surgical treatment has been less used. Endovascular treatment, despite lower long-term patency, has become the method of choice due to feasibility and low complication rates. Cases Report: Four cases of endovascular revascularization of CT with stenting are described in patients with suggestive symptoms of CMI. The diagnostic evaluation was performed using multislice CT angiography. Three

  20. Assistência de enfermagem a idosos que realizam cateterismo cardíaco: uma proposta a partir do modelo de adaptação de Calista Roy Asistencia de enfermería a ancianos que realizan cateterismo cardíaco: una propuesta a partir del modelo de adaptación de Calista Roy Nursing care to elderly patients undergoing heart catheterization: a proposal according to the Adaptation model of Calista Roy

    Directory of Open Access Journals (Sweden)

    Maria Célia de Freitas

    2006-10-01

    Full Text Available O estudo objetivou identificar os diagnósticos de enfermagem de idosos que realizam cateterismo cardíaco, abordando os aspectos psicossociais, segundo a Teoria de Adaptação de Roy. Desenvolveu-se em hospital de pronto-atendimento em cardiologia de Fortaleza-CE, de janeiro a julho de 2005. Utilizou-se entrevista semi-estruturada, com 18 idosos de ambos os sexos, no pré-cateterismo. Na análise reconheceram-se os diagnósticos: alteração na manutenção da saúde, ansiedade, medo e alteração no processo familiar. Como intervenções propõe-se: criar um clima de confiança, antes do exame; escutar e respeitar sentimentos, crenças e valores, orientar quanto ao procedimento. A utilização desta teoria permitiu reconhecer que as pessoas, mediante estímulos, podem desencadear respostas positivas ou negativas, cabendo ao enfermeiro atuar como mediador.El estúdio objetivó identificar los diagnósticos de enfermería abordando los aspectos psico-sociales de los pacientes que realizan cateterismo cardiaco, según la Teoría de Adaptación de Roy. Se desarrolló en la sección de cardiología de un hospital de Fortaleza-CE, de Janeiro a Julio de 2005. Se utilizó la entrevista semi-estructurada, con 18 ancianos, en el pre-cateterismo. En el análisis reconocieron los diagnósticos: alteración en la manutención de la salud, ansiedad, miedo y alteración en el proceso familiar. Entre las acciones se elaboraron las siguientes: crearse un clima de confianza para el paciente después del examen; escuchar y respetar sentimientos, creencias y valores referentes a la situación; orientar el paciente cuanto al procedimiento. La utilización de esta teoría permitió reconocer que las personas, mediante estímulos, pueden desencadenar respuestas ora positivas ora negativas, cabiendo al enfermero actuar como mediador.The study aimed at identifying the nursing diagnoses related to the psychological and social aspects of elderly patients undergoing

  1. Porównanie stężeń tlenku azotu w powietrzu wydychanym i pH kondensatu powietrza wydychanego u dzieci chorych na astmę i zdrowych

    Directory of Open Access Journals (Sweden)

    Bolesław Kalicki

    2009-12-01

    Full Text Available Istotą astmy jest proces zapalny toczący się w śluzówce drzewa oskrzelowego. Parametry oceniające nasilenie tego procesu stosowane do tej pory są mało obiektywne i trudne do uzyskania, zwłaszcza u dzieci. Możliwość rzetelnej oceny intensywności tego procesu wpłynęłaby na dokładniejszą diagnozę pacjenta i zobiektywizowałaby postępowanie lecznicze. W ostatnim okresie ukazało się wiele prac poświęconych poszukiwaniu takich narzędzi, które w łatwy, nieinwazyjny i tani sposób odzwierciedlą stan zapalny w układzie oddechowym. Za jeden z takich wykładników uznawany jest pomiar stężenia tlenku azotu (NO w wydychanym powietrzu. Jego stężenie zależy od aktywności iNOS – enzymu aktywowanego między innymi przez czynniki zapalne. Oznacza się go metodami chemiluminescencyjnymi. Wzrost stężenia sugeruje nasilenie zapalenia oskrzeli. Innym markerem stanu zapalnego branym pod uwagę w wielu badaniach jest pH kondensatu powietrza wydychanego (KPW, który jest pochodną płynu pokrywającego powierzchnię pęcherzyków płucnych. Spośród wielu substancji w nim rozpuszczonych oznaczanie jego pH jest najłatwiejszą metodą analizy KPW. Zauważono, że pH tego płynu spada w chorobach przebiegających z nasileniem stanu zapalnego w płucach. Obie wymienione metody są stosunkowo tanie i proste do zastosowania (również w populacji dziecięcej. Celem niniejszego badania była ocena stężeń NO w powietrzu wydychanym i pH KPW u dzieci z rozpoznaną astmą w okresie zaostrzenia choroby i porównanie tych wyników z wartościami uzyskanymi w grupie dzieci zdrowych. Do badań włączono 26 dzieci w wieku od 8 do 17 lat. Pomiędzy obiema grupami dzieci – zdrowych i chorych, uzyskano statystycznie znamienną różnicę wyników zarówno stężenia NO w powietrzu wydychanym, jak i pH KPW. W przypadku zaostrzenia astmy stężenie NO rosło, a pH KPW malało, oba parametry korelowały ze sobą. Wyniki te pozostają w zgodzie

  2. LA DEGRADACIÓN DE TIERRAS MEDIANTE ANÁLISIS FISIOGRÁFICO Y LA APLICACIÓN DE TÉCNICAS DE TELEDETECCIÓN EN LA CUENCA DEL RÍO GUAÑACOS, Resumen DEPARTAMENTO MINAS, NEUQUÉN

    Directory of Open Access Journals (Sweden)

    Ana Paula Salcedo

    2010-12-01

    Full Text Available Este estudio evalúa el estado de degradación en un sector sur del Departamento Minas, Provincia del Neuquén, correspondiente al valle y las planicies circundantes del río Guañacos. El análisis central se realiza mediante la utilización de técnicas de teledetección en el Sistema de Información Geográfica (SIG IDRISI 32, aplicando índices y algoritmos de vegetación específicos sobre imágenes del satélite Landsat 7. Además, se ha realizado un exhaustivo trabajo de campo relevando los indicadores de degradación con el objetivo de profundizar la clasificación e interpretación del medio natural y cotejar los resultados del análisis satelital.

  3. Pressão pulmonar aferida pela ecocardiografia em pacientes chagásicos indicados para transplante cardíaco Pulmonary pressure by echocardiophy in chagasic patients on heart transplant waiting list

    Directory of Open Access Journals (Sweden)

    Cláudio Léo Gelape

    2011-03-01

    Full Text Available INTRODUÇÃO: O paciente com insuficiência cardíaca desenvolve aumento da pressão pulmonar por mecanismo retrógrado e a hipertensão arterial pulmonar (HP é um marcador de mau prognóstico. OBJETIVO: Correlacionar pressão pulmonar ao ecogardiograma (eco e ao cateterismo, em pacientes em lista de espera para transplante cardíaco (TC, especialmente nos chagásicos. MÉTODOS: Avaliamos 90 pacientes no HC-UFMG entre 2004 e 2009. Todos realizaram cateterismo e eco no pré-transplante. A idade média foi de 45,5 anos, sendo 68(75,6% homens, 42(46,7% chagásicos, 32(35,6% portadores de miocardiopatia dilatada e 10(11,1% isquêmicos. RESULTADOS: A eco-PSAP (pressão sistólica arterial pulmonar média foi de 45 ± 12mmHg. A cat-PSAP média foi de 47 ± 14mmHg. A eco-PSAP-chagásicos foi 41,7 ±12,5 mmHg e não-chagásicos, 47,6 ±12,8 mmHg P=0,04. A cat-PSAP-chagásicos foi de 46 ±12,1 mmHg e não-chagásicos 48,7±12,8mmHg; P=0,43. Oito pacientes apresentavam cat-PSAP>60. A correlação entre a eco-PSAP e o cat-PSAP nos chagásicos foi r=0,45, P=0,008 e nos não-chagásicos de r=0,66, P32,5mmHg tem uma sensibilidade de 79% e especificidade de 75% para diagnosticar HP, com área sob a curva ROC de 0,819. A eco-PSAP-não chagásico>35,5 mmHg tem sensibilidade de 82% e especificidade de 70% para HP, com área sob a curva ROC de 0,776. CONCLUSÕES: Há boa correlação entre a eco-PSAP e a cat-PSAP (r=0,54 entre os pacientes em fila de espera. A eco-PSAP foi menor no grupo dos chagásicos. O ecocardiograma é um método útil para diagnosticar e monitorar a pressão pulmonar previamente ao TC, especialmente em pacientes chagásicos. Entretanto, não é possível prescindirmos do cateterismo para avaliar a reatividade pulmonar com o teste com vasodilatador e indicar com segurança o TC mesmo nos pacientes chagásicos.INTRODUCTION: The patients suffering heart failure develop an increase in pulmonary pressure because of a retrograde mechanism. The

  4. Comparação dos valores de débito cardíaco obtidos por termodiluição e dopplerfluxometria transesofágica Comparison between two methods for hemodynamic measurement: thermodilution and oesophageal doppler

    Directory of Open Access Journals (Sweden)

    Roberto Manara Victorio Ferreira

    2007-08-01

    Full Text Available OBJETIVO: A termodiluição (TD é padrão de monitorização hemodinâmica. Alguns par��metros hemodinâmicos podem ser medidos através do Doppler Transesofágico (DTE. Método simples, menos invasivo. Com o objetivo de avaliar a acurácia do DTE foram comparados TD e DTE na determinação de medidas de débito cardíaco (DC. MÉTODOS: Foram determinadas 192 medidas simultâneas, em diferentes situações clínicas em dez pacientes com idade entre 21 85 anos (cinco do gênero masculino e cinco do feminino, oito internados sépticos em uso de drogas vasoativas e dois monitorizados para laringectomia e transplante hepático; todas avaliadas ao longo de quatro horas, em intervalos de 30 minutos. Foram utilizados dois tipos de doppler: o DeltexR, e o ArrowR, introduzidos entre 35 e 45 cm da fossa nasal e localizados no ponto de maior diâmetro da aorta descendente. Na TD, foi utilizado cateter de artéria pulmonar (Swan Ganz BaxterR e monitor DX-2001R, confirmado o posicionamento radiologicamente e através das curvas pressóricas geradas. As medidas do DC realizadas através da TD foram obtidas com soro fisiológico gelado, sendo considerada a média de quatro medidas não diferentes de 5%. Foi aplicado o método estatístico de Bland e Altman, com utilização de gráfico de regressão linear. RESULTADOS: Não houve diferença estatisticamente significante entre esses dois métodos de medida hemodinâmica, com coeficiente de correlação de 0,88 para o DC (Doppler DeltexR X Swan Ganz BaxterR e coeficiente de correlação de 0,99 DC (Doppler Arrow rR X Swan Ganz BaxterR respectivamente, observando-se correlação. CONCLUSÃO: A medida das variáveis hemodinâmicas ao DTE foi obtida com facilidade nos dez pacientes estudados e revelou ter este dispositivo acurácia compatível à TD.OBJECTIVES: Thermodilution (TD is the "gold standard method" for hemodynamic monitoring. Some parameters can be measured by Oesophageal Doppler (OD, which is

  5. Validação de conteúdo das atuais e de novas características definidoras do diagnóstico de enfermagem débito cardíaco diminuído Validación de contenido de las actuales y nuevas características que definen el diagnostico de enfermería: disminución del gasto cardíaco Content validation of current and new defining characteristics of the nursing diagnosis: decreased cardiac output

    Directory of Open Access Journals (Sweden)

    Juliana de Lima Lopes

    2010-01-01

    Full Text Available OBJETIVO: Validar o conteúdo das características definidoras, tanto aquelas atualmente aprovadas como as identificadas por meio de revisão de literatura, para o diagnóstico de enfermagem Débito Cardíaco Diminuído. MÉTODOS: Trata-se de um estudo de validação de conteúdo utilizando o modelo proposto por Fehring. As características definidoras foram validadas por 18 peritos (oito enfermeiros e dez médicos, usando uma escala do tipo Likert de cinco pontos e seguindo a classificação: escore maior do que 0,80 foram consideradas como as características principais, as com peso entre 0,50 a 0,79 como secundárias e as com média menor ou igual a 0,50, como irrelevantes. RESULTADOS: Dentre as 79 características definidoras investigadas, 38 (48,1% foram validadas, dentre elas, 17 presentes na NANDA-I e, 41 (51,9% foram consideradas como irrelevantes para este diagnóstico, sendo que oito estão listadas na NANDA-I. CONCLUSÃO: As características definidoras listadas atualmente na classificação da Taxonomia da NANDA-I não abrangem completamente o diagnóstico de enfermagem débito cardíaco diminuído.OBJETIVO: Validar el contenido de las características definidoras, tanto de las actualmente aprobadas como las identificadas por medio de una revisión de la literatura, para el diagnóstico de enfermería: disminución del gasto cardíaco. MÉTODOS: Se trata de un estudio de validación de contenido utilizando el modelo propuesto por Fehring. Las características definidoras fueron validadas por 18 expertos (ocho enfermeros y diez médicos, usando una escala de tipo Likert de cinco puntos y siguiendo la siguiente clasificación: las con puntaje mayor que 0,80 fueron consideradas como características principales; las con peso entre 0,50 y 0,79 como secundarias; y, las con promedio menor o igual a 0,50, como irrelevantes. RESULTADOS: Entre las 79 características definidoras investigadas, 38 (48,1% fueron validadas, entre ellas, 17 se

  6. Critical cleavage fracture stress characterization of A508 nuclear pressure vessel steels

    International Nuclear Information System (INIS)

    Wu, Sujun; Jin, Huijin; Sun, Yanbin; Cao, Luowei

    2014-01-01

    The critical cleavage fracture stress of SA508 Gr.4N and SA508 Gr.3 low alloy reactor pressure vessel (RPV) steels was studied through the combination of experiments and finite element method (FEM) analysis. The results showed that the value of the local cleavage fracture stress, σ F , of SA508 Gr.4N steel was significantly higher than that of SA508 Gr.3 steel. Detailed microstructural analysis was carried out using FEGSEM which revealed much smaller grains, finer and more homogenous carbide particles formed in SA508 Gr.4N steel. Compared with the SA508 Gr.3 steel currently used in the nuclear industry, the SA508 Gr.4N steel possesses higher strength and notch toughness as well as improved cleavage fracture behavior, and is considered a better candidate RPV steel for the next generation nuclear reactors. - Highlights: • Critical cleavage fracture stress was calculated through experiments and FEM. • Effects of both grain and carbide particle sizes on σ F were discussed. • The SA508 Gr.4N steel is a better candidate for the next generation nuclear reactors

  7. Avaliação hemodinâmica e evolução clínica de crianças portadoras de cardiomiopatia dilatada grave candidatas a transplante cardíaco Hemodynamic evaluation and clinical outcome of children candidates for heart transplantation with severe dilated cardiomyopathy

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    Estela Azeka

    1998-11-01

    Full Text Available OBJETIVO: Estudar o perfil dos parâmetros hemodinâmicos e a evolução clínica de crianças candidatas a transplante cardíaco, portadoras de cardiomiopatia grave. MÉTODOS: Foram 24 crianças, com idade entre 4 meses e 10 anos e 8 meses (média de 3,7±2,5 anos, no período de fevereiro/92 a maio/96, submetidas a estudo hemodinâmico e medidos os seguintes parâmetros: débito cardíaco, pressão média de artéria pulmonar (PMAP e pressão capilar pulmonar. Foram calculados o índice de resistência vascular pulmonar (IRVP e gradiente de pressão transpulmonar (GPT. RESULTADOS: Do ponto de vista evolutivo, 10 (41,6% crianças foram transplantadas (grupo A, 5 (20,8% aguardam o transplante (grupo B e 9 (37,6% faleceram (grupo C. Observou-se que a média das idades dos pacientes do grupo B foi significativamente menor que do grupo C. Dos dados hemodinâmicos, a PMAP, GTP e IRVP apresentaram médias significativamente menores no grupo A em relação ao grupo C. CONCLUSÃO: O perfil hemodinâmico de crianças candidatas ao transplante cardíaco mostrou-se compatível ao quadro clínico de insuficiência cardíaca grave. A idade foi o único fator que diferenciou o grupo B e C (p= 0,036. O IRVP, PMAP e o GTP foram fatores que diferenciaram de modo significativo o grupo A e o grupo C (p=0,010; p=0,044 e p=0,023, respectivamente. Quanto maior a idade no momento da indicação do transplante na criança, pior foi seu prognóstico.PURPOSE: To evaluate hemodynamic parameters and clinical outcome of children with severe cardiomyopathy who are candidates for heart transplantation. METHODS: Twenty four children aged from 4 months to 10 years and 8 months (mean 3.7±2.5 years from February 1992 to May 1996, were submitted to hemodynamic study and the following parameters were measured: cardiac output, mean pulmonary artery pressure (MPAP and capillary wedge pressure. The pulmonary vascular resistance index (PVRI and transpulmonary pressure gradient (TGP

  8. Perfil clínico de pacientes chagásicos e não-chagásicos portadores de marca-passo cardíaco artificial Clinical profile of Chagas and non-Chagas' disease patients with cardiac pacemaker

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    Leonor Garcia Rincon

    2006-06-01

    Full Text Available O objetivo do estudo foi comparar pacientes chagásicos e não-chagásicos com marca-passo cardíaco artificial uni ou bicameral quanto à fração de ejeção do ventrículo esquerdo, o limiar de estimulação ventricular e a incidência de arritmias cardíacas. Entre janeiro/2001 e novembro/2002 foram avaliados 45 pacientes chagásicos e 35 não-chagásicos portadores de marca-passo quanto à história clínica, radiografia do tórax, ecocardiograma, Holter 24h e análise telemétrica do marca-passo. Embora os chagásicos fossem mais jovens, os dois grupos foram semelhantes quanto a variáveis radiológicas e o limiar de estimulação ventricular direito. Os chagásicos apresentaram menor fração de ejeção do ventrículo esquerdo ao ecocardiograma e maior incidência de arritmia ventricular ao Holter 24h. Observou-se correlação positiva entre a baixa fração de ejeção do ventrículo esquerdo e a intensidade da arritmia ventricular ao Holter 24h. Em pacientes com marca-passo, a doença de Chagas está associada a marcadores cardíacos de prognóstico adverso.The aim of this study was to compare Chagas and non-Chagas' disease patients using single or dual-chamber pacemaker in relation to the ejection fraction of the left ventricle, the ventricular stimulation threshold and the occurrence of ventricular arrhythmia. From January, 2001 to November, 2002, 45 Chagas' disease patients and 35 non-Chagas' disease patients, all pacemaker users, were evaluated considering clinical history, echocardiographic study, Holter monitoring and analysis of the pacemaker telemetry data. Chagas' disease patients were significantly younger, but both groups were similar when chest X-Ray variables and right ventricular stimulation threshold were analyzed. Chagas' disease patients had a lower left ventricular ejection fraction and more frequent ventricular arrhythmia during Holter monitoring. A positive correlation between the low ejection fraction of the left

  9. Efeitos da suplementação do 17beta-estradiol no dano oxidativo cardíaco de ratas submetidas à privação dos hormônios ovarianos Effects of 17beta-estradiol replacement on cardiac oxidative damage in rats submitted to ovarian hormone deprivation

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    Sônia Maria Rolim Rosa Lima

    2007-01-01

    Full Text Available OBJETIVO: avaliar o estresse oxidativo em tecido cardíaco de ratas ooforectomizadas, com ou sem terapia hormonal. MÉTODOS: ratas Wistar foram divididas em três grupos: grupo controle (GC, grupo ooforectomizada (GO e grupo ooforectomizada + suplementação hormonal (GOS. A privação estrogênica foi obtida pela ooforectomia bilateral. Uma semana após a ooforectomia, um pellet de 1,5 mg de 17beta-estradiol foi implantado nos animais do grupo GOS. Nove semanas após a ooforectomia, o tecido cardíaco foi obtido para a análise do estresse oxidativo por meio da medida da quimiluminescência e da atividade das enzimas antioxidantes catalase (CAT, superóxido dismutase (SOD e glutationa peroxidase (GPx. RESULTADOS: a quimiluminescência estava aumentada no GO (7348±312 cps/mg proteína quando comparado ao GC (6250±41 cps/mg proteína, pPURPOSE: to evaluate oxidative stress in cardiac tissue of ovariectomized rats, with and without hormonal therapy. METHODS: female Wistar rats were divided in three groups: control group (CG; ovariectomized group (OG; ovariectomized group with estrogen supplementation (ESG. The estrogen deprivation was done through bilateral ovariectomy. After one week from the ovariectomy, a pellet of 1.5 mg of 17beta-estradiol was implanted in the ESG animals. Nine weeks after the ovariectomy, cardiac tissue was obtained for the analysis of the oxidative stress through CL (chemiluminescence, and measurement of antioxidant enzymes catalase (CAT, superoxide dismutase (SOD and gluthatione peroxidase (GPx. RESULTS: CL was increased in the OG (7348±312 cps/mg protein when compared with the CG (6250±41 cps/mg protein, p<0.01, but there was no significant difference between the CG and the ESG (6170±237 cps/mg protein. Ovariectomy reduced SOD (35%, p<0.05 and CAT (22%, p<0.001 activities in the OG as compared with the CG. Hormonal therapy normalized antioxidant enzymes activities in the ESG. There was no statistically significant

  10. Transplante cardíaco: complicações apresentadas por pacientes durante a internação Trasplante de corazón: complicaciones que presentan los pacientes durante la hospitalización Heart Transplantation: complications presented by patients during the hospitalization

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    Elaine Araújo da Silva

    2012-12-01

    Full Text Available Com o avanço da ciência, a insuficiência cardíaca tem como possibilidade de intervenção o transplante cardíaco. Este trabalho teve como objetivos traçar o perfil demográfico dos pacientes submetidos ao transplante cardíaco e identificar as complicações apresentadas durante a internação. Trata-se de um estudo descritivo, quantitativo, realizado com 44 prontuários de pacientes submetidos a transplante de junho/2006 a julho/2009 em um Hospital Universitário de Belo Horizonte, Minas Gerais, Brasil. O projeto atendeu às recomendações da Resolução 196/96. Pelos resultados, a maioria dos pacientes era do sexo masculino, casada, escolaridade de nível fundamental e idade média de 45,2 anos. A miocardiopatia chagásica foi a principal causa de insuficiência cardíaca. As complicações predominantes foram alteração da glicemia, insuficiência renal e infecções. A taxa de mortalidade na internação foi de 20,4%. Além das complicações biológicas só foram registradas ansiedade e depressão. São necessárias pesquisas sobre o tema nos âmbitos psicossociais e espirituais, contribuindo para o desenvolvimento científico.Hoy día, con los avances de la medicina y de la tecnología para el tratamiento de la insuficiencia cardiaca irreversible, se ha utilizado como última intervención el trasplante cardíaco. Este trabajo se desarrolló con los objetivos de delinear el perfil demográfico de los pacientes sometidos a trasplante cardíaco e identificar las complicaciones presentadas por ellos después del trasplante de corazón. Estudio descriptivo y cuantitativo, realizado en conjunto con los registros de 44 pacientes sometidos a trasplante de corazón desde Jun/2006 hasta Jul/2009, en un Hospital Universitario de Belo Horizonte, Minas Gerais, Brasil. El proyecto cumplió con las recomendaciones de la Resolución 196/96. Los resultados mostraron que la mayoría de los pacientes eran del sexo masculino, casados, con educaci

  11. Prevalência da estenose aterosclerótica do tronco celíaco e da artéria mesentérica superior na arteriopatia oclusiva dos membros inferiores Prevalence of atherosclerotic stenosis of celiac trunk and superior mesenteric artery in occlusive arteriopathy of lower limbs

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    Wenes Pereira Reis

    2010-01-01

    Full Text Available Contexto: A eventual relação entre a aterosclerose das artérias dos membros inferiores com a aterosclerose das artérias intestinais foi pouco estudada. Objetivo: Avaliar pela ecografia vascular (Doppler presença de lesões com estenose 70% na artéria mesentérica superior e/ou tronco celíaco em doentes com arteriopatia obstrutiva crônica dos membros inferiores. Método: Foram estudados dois grupos, cada um com 60 doentes (40 homens e 20 mulheres. O grupo-caso foi composto por doentes com arteriopatia obstrutiva crônica dos membros inferiores, claudicação intermitente limitante ou dor de repouso e/ou lesões tróficas de extremidade, sem queixas gastrintestinais. O grupo-controle foi constituído por enfermos sem doença arterial obstrutiva dos membros inferiores e sem queixas gastrintestinais. Consideraram-se fatores de risco presença de diabetes melito, hipertensão arterial, obesidade, angina/infarto, tabagismo e dislipidemia. Todos os doentes foram submetidos a ecografia vascular do tronco celíaco e da artéria mesentérica superior. Os doentes do grupo-caso foram separados pela presença de claudicação intermitente limitante (N = 12 ou lesão trófica e/ou dor de repouso (N = 48. Resultados: Houve associação significante entre idade (p = 0,04 e cardiopatia isquêmica (p = 0,04 com aterosclerose da artéria mesentérica superior. Os fatores de risco não mostraram associação significante com presença de estenose do tronco celíaco. Observou-se associação significante entre arteriopatia dos membros inferiores e lesão estenótica da artéria mesentérica superior (p = 0,006 e do tronco celíaco (p Background: The occasional relationship between arterial atherosclerosis of lower limbs and atherosclerosis of intestinal arteries has not been fully studied yet. Objective: To assess the presence of lesions with ≥ 70% stenosis in the superior mesenteric artery and/or in the celiac trunk in patients with chronic obstructive

  12. Constitution et processus d'intégration socio-économique d'une micro-colonie chinoise dans une communauté andine à la fin du XIXe siècle: Acos - vallée du Chancay

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    1980-01-01

    Full Text Available Plus de 80000 Chinois furent 'importés de force' au Pérou entre 1854 et 1874, année où le Traité de Tien Tsin mit fin à ce trafic. Le Pérou de cette seconde moitié du XIXe souffrait d'un manque de main-d'oeuvre aigu, situation aggravée par la libération des esclaves noirs d'une part et d'autre part par l'essor prit par les haciendas sucrières, la construction des premières lignes de chemin de fer et l'extraction du guano. Entre 1860 et 1870 par exemple arrivèrent au seul port de Callao plus de 38000 'coolies'. En 1876, dans la province de Chancay à Aucallama étaient employés 1225 'asiáticos' soit plus de 66% de la population locale. A la fin du siècle, beaucoup étaient morts, certains avaient réussi à retourner en Chine, et d'autres s'étaient définitivement installés, rejoints par une seconde vague de Chinois commerçants attirés par l'essor du Pérou. La plupart des Chinois s'établirent sur la côte où ils étaient arrivés et dans des centres urbains. Même parmi ceux qui travaillèrent dans la construction des chemins de fer, très peu s'installèrent définitivement dans les régions minières d'altitude. A Acos, petite communauté (300 à 400 habitants de la vallée du Chancay établie dans un fond de vallée chaude ou 'quebrada de yunga', on a retrouvé la présence d'une micro-colonie de Chinois. Dans quelles circonstances aboutirent-ils dans ce village de 'sierra' (1 550 m? Comment s'y intégrèrent-ils et quel fut leur rôle économique sont les questions que nous nous poserons dans cet article, puis dans un suivant traitant spécifiquement de leur rôle dans l'essor du village. Notons un dernier point: le village d'Acos à l'arrivée des Chinois était dominé par un groupe de familles dites 'légitimes' qui détenaient surtout un pouvoir fondé sur la propriété foncière. Les Chinois, en contribuant à développer l'économie de marché, entrèrent en conflit avec ce groupe mais surent aussi se le

  13. Avaliação da correlação entre o dióxido de carbono expirado e o débito cardíaco em pacientes submetidos à cirurgia cardíaca com circulação extracorpórea Evaluación de la correlación entre el dióxido de carbono expirado y el débito cardíaco en pacientes sometidos a la cirugía cardíaca con circulación extracorpórea Correlation between end-tidal carbon dioxide levels and cardiac output during cardiac surgery with cardiopulmonary bypass

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    Karina Takesaki Miyaji

    2004-10-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O CO2 expirado (P ET CO2 reflete, além da ventilação pulmonar (eliminação, a produção de dióxido de carbono (metabolismo e o fluxo sangüíneo pulmonar (circulação. Quando o metabolismo e a ventilação são constantes, o CO2 expirado reflete o fluxo sangüíneo pulmonar e, desta forma, o débito cardíaco (DC. Este estudo tem como objetivo a avaliação da correlação entre o dióxido de carbono expirado (P ET CO2 e o débito cardíaco em pacientes submetidos à cirurgia cardíaca com circulação extracorpórea (CEC. MÉTODO: Foram estudados 25 pacientes submetidos à cirurgia de revascularização miocárdica com CEC. Após a intubação traqueal iniciou-se a monitorização da P ET CO2. A determinação do débito cardíaco (DC foi feita por método de termodiluição com o uso de cateter de Swan-Ganz e a PaCO2 foi avaliada através de gasometria arterial. Os parâmetros do estudo foram avaliados em quatro momentos: logo após a indução da anestesia geral; antes da circulação extracorpórea, ao término da circulação extracorpórea e ao final da cirurgia. RESULTADOS: O teste estatístico não demonstrou uma correlação entre o CO2 expirado e o DC, assim como o gradiente de dióxido de carbono arterial e expirado (Ga-eCO2 e o DC. Foi encontrada correlação entre a variação dos valores da P ET CO2, Ga-eCO2 e DC em relação ao basal antes da CEC com perda da correlação após a CEC até o final da cirurgia. CONCLUSÕES: Neste estudo, onde se avaliam pacientes submetidos à cirurgia cardíaca com CEC, as alterações de relação ventilação/perfusão ocorridas ao longo do procedimento são, provavelmente, os fatores determinantes da diminuição da correlação entre o débito cardíaco e o valor de dióxido de carbono expirado.JUSTIFICATIVA Y OBJETIVOS: El CO2 expirado (P ET CO2 refleja, además de la ventilación pulmonar (eliminación, la producción de dióxido de carbono (metabolismo y el

  14. Dimensão fractal na quantificação do grau de rejeição celular miocárdica pós-transplante cardíaco Fractal dimension in quantifying the degree of myocardial cellular rejection after cardiac transplantation

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    Roberto Douglas Moreira

    2011-06-01

    Full Text Available INTRODUÇÃO: O termo "fractal" é derivado do latim fractus, que significa "irregular" ou "quebrado", considerando a estrutura observada como tendo uma dimensão não-inteira. Há muitos estudos que empregaram a Dimensão Fractal (DF como uma ferramenta de diagnóstico. Um dos métodos mais comuns para o seu estudo é a "Box-plot counting" (Método de contagem de caixas. OBJETIVO: O objetivo do estudo foi tentar estabelecer a contribuição da DF na quantificação da rejeição celular miocárdica após o transplante cardíaco. MÉTODOS: Imagens microscópicas digitalizadas foram capturadas na resolução 800x600 (aumento de 100x. A DF foi calculada com auxílio do "software ImageJ", com adaptações. A classificação dos graus de rejeição foi de acordo com a "Sociedade Internacional de Transplante Cardíaco e Pulmonar" (ISHLT 2004. O relatório final do grau de rejeição foi confirmado e redefinido após exaustiva revisão das lâminas por um patologista experiente externo. No total, 658 lâminas foram avaliadas, com a seguinte distribuição entre os graus de rejeição (R: 335 (0R, 214 (1R, 70 (2R, 39 (3R. Os dados foram analisados estatisticamente com os testes Kruskal-Wallis e curvas ROC sendo considerados significantes valores de P INTRODUCTION: The term "Fractal" is derived from the Latin fractus meaning "irregular" or "broken" considering the observed structure with a non-integer dimension. There are many studies which employed the Fractal Dimension (FD as a diagnostic tool. One of the most common methods for its study is the "Box Counting Method". OBJECTIVE: The aim of the present study was to try to establish the contribution of FD in the quantification of myocardial cellular rejection after cardiac transplantation. METHODS: Microscopic digital images were captured at 800x600 resolution (magnification 100x. FD was calculated with the aid of "ImageJ software" with adaptations. The classification of the degrees of rejection was in

  15. Diagnósticos de Enfermagem em pacientes pós-cateterismo cardíaco: contribuição de Orem Diagnósticos de Enfermería en pacientes post-cateterismo cardiaco: contribuición de Orem Nursing Diagnoses in patients after heart catheterization: contribution of Orem

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    Luciano Ramos de Lima

    2006-06-01

    Full Text Available Estudo de múltiplos casos, transversal, envolvendo 30 clientes, no período pós-cateterismo cardíaco. Objetivou estabelecer Diagnósticos de Enfermagem da North American Nursing Diagnosis Association (NANDA. O método de coleta de dados foi o Processo de Enfermagem fundamentado na Teoria Déficit do Autocuidado. Foram estabelecidos 25 diferentes Diagnósticos de Enfermagem. Todos os pacientes apresentaram Integridade tissular prejudicada; Risco para infecção; Dor aguda (região inguinal; Mobilidade física prejudicada, Déficit do autocuidado para higiene íntima e Risco para lesão orgânica renal. Conclui-se que a Teoria do Déficit de autocuidado facilitou a classificação de Diagnósticos de Enfermagem da NANDA, contribuindo para individualização, humanização e qualificação da assistência de enfermagem, além de promover o auto-conhecimento, auto-controle e a participação dos clientes no próprio cuidado.Estudio transversal de múltiplos casos, incluyendo 30 pacientes, en período post-cateterismo cardíaco. Con el objectivo de establecer Diagnósticos de Enfermería de North American Nursing Diagnosis Association (NANDA-Asociación Norteamericana de Diagnósticos de Enfermería.El método de recolecta de datos fue el Proceso de Enfermería, fundamentado en la Teoría de Déficit del Autocuidado de Dorothea Orem. Fueron establecidos 25 diferentes Diagnósticos de Enfermería. Todos los pacientes presentaron perfusión tisular perjudicada; Riesgo para infección; Dolor aguda em la región ingle, Movilidad física prejudicada. Déficit de autocuidado para higiene íntima y riesgo para lesión orgánica renal fue identificado en 100% de los pacientes. Se concluye que, la Teoría de Déficit de Autocuidado de Dorothea Orem, facilitó la clasificación de Diagnósticos de Enfermería de NANDA. Contribuyó para individualización, humanización y calificación de la asistencia de enfermería, incentivando la participación del

  16. Perspectivas da evolução clínica de pacientes com cardiomiopatia chagásica listados em prioridade para o transplante cardíaco Clinical perspectives of patients with Chagas cardiomyopathy listed as high priority for heart transplantation

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    Luiz Felipe P. Moreira

    2005-09-01

    Full Text Available INTRODUÇÃO: O choque cardiogênico é responsável por elevados índices de mortalidade na fila de espera para o transplante cardíaco. Na cardiomiopatia chagásica, a alta incidência de disfunção biventricular pode contribuir com a gravidade desta complicação. MÉTODO: Foram estudados 141 pacientes indicados em caráter de prioridade para o transplante. Destes pacientes, 46 eram portadores de cardiomiopatia chagásica e 95 de outras cardiomiopatias. O choque cardiogênico foi tratado farmacologicamente e com o implante ocasional do balão intra-aórtico. Em cinco pacientes chagásicos, foi realizado o implante de dispositivo paracorpóreo de assistência ventricular esquerda. RESULTADOS: Num período médio de 2,8 meses, 58 (41,1% dos 141 pacientes foram transplantados, 73 (51,7% faleceram e 10 foram retirados da fila. A mortalidade entre os pacientes chagásicos e não chagásicos foi de 45,6% e 54,7%, respectivamente. No entanto, a expectativa média de vida, sem a realização do transplante cardíaco, dos pacientes chagásicos foi de apenas 1,5 meses, sendo observado risco relativo de mortalidade de 1,6 para estes pacientes em relação aos não chagásicos (pINTRODUCTION: Heart failure is responsible for high mortality rates of patients on heart transplantation waiting lists. In Chagas cardiomyopathy, the presence of biventricular dysfunction increases the severity of this situation. METHOD: One hundred and forty-one patients suffering from cardiogenic shock, listed as high priority for heart transplantation, were studied. Forty-six patients presented with Chagas cardiomyopathy and 95 with other cardiomyopathies. Heart failure was treated using intravenous inotropic drugs and intra-aortic balloon pump implantation. Five patients with Chagas disease underwent paracorporeal left ventricular assist device implantation. RESULTS: During a mean follow-up of 2.8 months, 58 (41.1% of the 141 patients were transplanted, while 73 (53.7% died

  17. Efeitos do exercício aeróbico e anaeróbico em variáveis de risco cardíaco em adultos com sobrepeso Effects of aerobic and anaerobic exercise on cardiac risk variables in overweight adults

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    Mônica Medeiros Moreira

    2008-10-01

    Full Text Available FUNDAMENTO: O exercício físico aeróbico é importante aliado no combate aos fatores de risco cardiovascular. No entanto, os efeitos de exercícios de alta intensidade sobre tais fatores ainda são pouco conhecidos. OBJETIVO: Comparar os efeitos de protocolos de exercícios aeróbico e anaeróbico sobre fatores associados ao risco cardíaco. MÉTODOS: Vinte e dois indivíduos com idade média de 40±8 anos foram alocados nos grupos: controle (CO, treinamento de endurance (ET e treinamento intermitente (IT. Os protocolos tiveram duração de 12 semanas, três vezes por semana; e intensidades de 10% abaixo e 20% acima do limiar anaeróbico (LAn. Foram medidas: massa corporal total (MCT, índice de massa corporal (IMC, circunferências de cintura (CINT e quadril (QUA e a composição corporal, além das concentrações plasmáticas de glicose (GLI, colesterol total (CHO e triglicérides (TG; ainda foram calculados a razão cintura-quadril (PCCQ e o índice de conicidade (Índice C. RESULTADOS: As variáveis de MCT, IMC, CINT, GLI e a composição corporal apresentaram alterações significativas nos grupos ET e IT. Os valores de CHO e QUA foram significativamente reduzidos no grupo ET, enquanto a PCCQ mostrou redução significativa no grupo IT. O LAn e o índice C, no grupo IT foram significativamente diferentes em relação a ET. CONCLUSÃO: Tendo em vista as diferenças encontradas nas respostas das variáveis estudadas, em razão do treinamento empregado, concluímos que um programa de exercício que contemple atividades de alta e baixa intensidades seja mais completo para garantir a redução de maior número de variáveis de risco cardíaco.BACKGROUND: Aerobic exercise is an important ally in the fight against cardiovascular risk factors. However, the effects of high-intensity exercise on these factors are still poorly known. OBJECTIVE: To compare the effects of aerobic and anaerobic exercise protocols on cardiac risk factors. METHODS: 22

  18. Um modelo experimental de ablação do Sistema Nervoso Intrínseco Cardíaco reduz a contratilidade do coração de ratos A new experimental model of chemical ablation of the Intrinsic Cardiac Nervous System reduces heart contractility and causes a type of dilated cardiopathy in rats

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    Adilson Scorzoni Filho

    2004-09-01

    Full Text Available OBJETIVO: A função do Sistema Nervoso Intrínseco Cardíaco e o seu papel na doença cardíaca permanecem pobremente compreendidos. Sabe-se que o cloreto de benzalcônio (CB induz a desnervação intrínseca do tubo digestivo. O objetivo deste estudo foi tentar produzir um modelo experimental de desnervação intrínseca do coração utilizando o CB. MÉTODO: Trinta ratos Wistar foram submetidos à aplicação intrapericárdica de CB (0,3% e trinta animais controle receberam a solução salina. Após 15 dias, os animais foram divididos em três grupos, com 10 animais tratados e 10 controles em cada. Os animais do grupo I foram submetidos a estudo radiológico e histopatológico. A área cardíaca e o índice cardiotorácico (ICT foram medidos nas radiografias. Os animais do grupo II foram submetidos a estudo hemodinâmico com registro da pressão arterial, freqüência cardíaca e débito cardíaco. No grupo III, a integridade da inervação parassimpática extrínseca do coração foi avaliada por estimulação vagal direita. O sistema de condução foi avaliado pelo ECG basal. RESULTADOS: A aplicação de CB acarretou aumento do ICT, da área cardíaca, pressão arterial e débito cardíaco, bem como do peso ponderal e do fígado. Nestes animais, a análise histopatológica mostrou redução do número de neurônios atriais e congestão passiva crônica do fígado. A estimulação vagal não mostrou diferenças entre os grupos experimentais. CONCLUSÃO: A ablação do sistema nervoso intrínseco propiciou o aparecimento de cardiopatia dilatada com insuficiência cardíaca direita e esquerda. Esse modelo experimental inédito deverá nortear futuros estudos na tentativa da elucidação da relação entre lesão neuronal e miocardiopatia.OBJECTIVE: The function of Intrinsic Cardiac Nervous System is largely unknown, as is its role in heart disease. In the digestive system, a topic aplication of Benzalkonium chloride (BC leads to intrinsic

  19. ASTM test methods for composite characterization and evaluation

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    Masters, John E.

    1994-01-01

    A discussion of the American Society for Testing and Materials is given. Under the topic of composite materials characterization and evaluation, general industry practice and test methods for textile composites are presented.

  20. New ASTM Standards for Nondestructive Testing of Aerospace Composites

    Science.gov (United States)

    Waller, Jess M.; Saulsberry, Regor L.

    2010-01-01

    Problem: Lack of consensus standards containing procedural detail for NDE of polymer matrix composite materials: I. Flat panel composites. II. Composite components with more complex geometries a) Pressure vessels: 1) composite overwrapped pressure vessels (COPVs). 2) composite pressure vessels (CPVs). III. Sandwich core constructions. Metal and brittle matrix composites are a possible subject of future effort.

  1. Biodiesel Fuel Quality and the ASTM Biodiesel Standard

    Science.gov (United States)

    Biodiesel is usually produced from vegetable oils, animal fats and used cooking oils with alternative feedstocks such as algae receiving increasing interest. The transesterification reaction which produces biodiesel also produces glycerol and proceeds stepwise via mono- and diacylglycerol intermedi...

  2. Astmed ja hüpped / Meelis Friedenthal

    Index Scriptorium Estoniae

    Friedenthal, Meelis, 1973-

    2010-01-01

    Dan Gordoni näidend "Vihmamees" (Rain Man) samanimelise filmi põhjal, filmistsenaariumi autorid Ronald Bass ja Barry Morrow, stsenaariumi aluseks Barry Morrow jutustus, lavastaja Georg Malvius. Esietendus 20. novembril Vanemuise väikeses majas

  3. Biomarcadores cardíacos: Presente y futuro

    Directory of Open Access Journals (Sweden)

    Eduardo Fernández, MD

    2012-11-01

    Fruto de estas investigaciones, en los últimos treinta años se ha producido un avance importante en el desarrollo de biomarcadores cardiacos. Entre ellos están los recién desarrollados ensayos de troponinas ultrasensibles para diagnóstico temprano, la medición de la albúmina modificada por isquemia que cuenta con alto valor predictivo negativo para la detección de isquemia miocárdica, el ligando de CD40 soluble para la clasificación e individualización del tratamiento, la utilidad de la proteína C reactiva como marcador de riesgo de enfermedad coronaria y las diversas técnicas de alto rendimiento como la proteómica, que permite la detección de múltiples biomarcadores potenciales. A pesar de ello, aún no se dispone de evidencia suficiente para sustituir los marcadores que recomiendan las asociaciones científicas por los nuevos marcadores que se han ido desarrollando, y continúa el debate sobre qué combinación utilizar para alcanzar mayor rendimiento diagnóstico, pronostico y terapéutico. A continuación se revisan los avances actuales en biomarcadores cardiacos y su potencial integración a la práctica clínica habitual.

  4. A Hybrid ACO Approach to the Matrix Bandwidth Minimization Problem

    Science.gov (United States)

    Pintea, Camelia-M.; Crişan, Gloria-Cerasela; Chira, Camelia

    The evolution of the human society raises more and more difficult endeavors. For some of the real-life problems, the computing time-restriction enhances their complexity. The Matrix Bandwidth Minimization Problem (MBMP) seeks for a simultaneous permutation of the rows and the columns of a square matrix in order to keep its nonzero entries close to the main diagonal. The MBMP is a highly investigated {NP}-complete problem, as it has broad applications in industry, logistics, artificial intelligence or information recovery. This paper describes a new attempt to use the Ant Colony Optimization framework in tackling MBMP. The introduced model is based on the hybridization of the Ant Colony System technique with new local search mechanisms. Computational experiments confirm a good performance of the proposed algorithm for the considered set of MBMP instances.

  5. Image analysis of corrosion pit initiation on ASTM type A240 stainless steel and ASTM type A 1008 carbon steel

    Science.gov (United States)

    Nine, H. M. Zulker

    The adversity of metallic corrosion is of growing concern to industrial engineers and scientists. Corrosion attacks metal surface and causes structural as well as direct and indirect economic losses. Multiple corrosion monitoring tools are available although those are time-consuming and costly. Due to the availability of image capturing devices in today's world, image based corrosion control technique is a unique innovation. By setting up stainless steel SS 304 and low carbon steel QD 1008 panels in distilled water, half-saturated sodium chloride and saturated sodium chloride solutions and subsequent RGB image analysis in Matlab, in this research, a simple and cost-effective corrosion measurement tool has identified and investigated. Additionally, the open circuit potential and electrochemical impedance spectroscopy results have been compared with RGB analysis to gratify the corrosion. Additionally, to understand the importance of ambiguity in crisis communication, the communication process between Union Carbide and Indian Government regarding the Bhopal incident in 1984 was analyzed.

  6. Ação do soro de cabra anti-soro de coelho imunizado ou não com células linfóides do doador sobre o alotransplante cardíaco em ratos: immunosupression of goat antiserum against rabbit serum immunized or not with donor lymphoid cells Cardiac allograft in rats

    Directory of Open Access Journals (Sweden)

    Haylton Jorge Suaid

    2002-01-01

    Full Text Available INTRODUÇÃO: A rejeição imunológica é uma das principais causas da perda de órgãos transplantados. A tentativa do controle da reação imunológica é clinicamente feita através da imunossupressão inespecífica e experimentalmente também por bloqueio específico. O alotransplante cardíaco em ratos pela técnica de ONO,K é um bom método para avaliação clínica da rejeição e de estudos voltados para o controle da rejeição. Objetivo : estudar o efeito de um anti-antisoro linfocitário, anti-linfócitos do doador sobre a rejeição do alotransplante cardíaco de ratos Wistar para ratos Holtzman. MÉTODOS: o soro anti-linfocitário (SAL foi obtido através da imunização de coelhos com linfócitos obtidos de gânglios linfáticos da cadeia mesentérica de ratos Wistar, em solução de Tyrode, contendo 3x10(9 células/ ml. A inoculação de 3 coelhos foi feita com 1 ml da suspensão celular e 1 ml de adjuvante completo de Freund. Duas semanas após a primeira inoculação fez-se 4 doses semanais de reforço. Os coelhos foram sangrados na 5ª semana, quando então foram separados os soros. A titulação dos soros foi realizada pelo teste de citotoxicidade, sendo verificado que ambos apresentaram título de 1:1024. A dosagem de proteínas mostrou albumina com 3,1 e 2,7 g% e globulinas com 3,5 e 2,9 g%, sendo o normal 3,7 e 2,2 g% respectivamente. Os dois SAL foram misturados. Duas cabras foram inoculados, com 3 ml da mistura desses SAL, associados a 2 ml de adjuvante de Freund. As doses de reforço com 5 ml do SAL foram iniciadas 2 semanas após. A cabra A recebeu 8 doses (1,4 g de globulinas. A cabra B recebeu 4 doses de reforço (0,7 g de globulinas. Uma semana após a última inoculação retirou-se 125 ml de sangue de cada cabra, fazendo a separação dos anti-soro anti-SAL (ASAL. Uma terceira cabra C foi imunizada com soro normal de coelho. A determinação de precipitinas foi feita pelo método de OUCHTERLONY. O ASAL A teve t

  7. Perfil sérico da molécula de adesão intercelular-1 no pós-operatório cardíaco de lactentes submetidos à circulação extracorpórea

    Directory of Open Access Journals (Sweden)

    Hunsche Angela

    2002-01-01

    Full Text Available Objetivos: mensurar os níveis séricos da molécula de adesão intercelular-1, solúvel em condições basais e após exposição ao circuito de circulação extracorpórea, em lactentes submetidos à cirurgia cardíaca para correção de defeitos cardíacos congênitos. Métodos: estudo de coorte contemporâneo envolvendo 21 lactentes submetidos à cirurgia cardíaca com uso de circulação extracorpórea. Foram medidos os níveis séricos da molécula de adesão intercelular-1, solúvel na indução anestésica, ao término e 8 e 26 horas após o término da circulação extracorpórea. As amostras foram dosadas através do método de ELISA. Resultados: as patologias cardíacas congênitas mais comuns foram defeito do septo atrioventricular e Tetralogia de Fallot. As médias de idade e de peso foram 6,6 meses e 5,8 quilos. As medianas dos tempos de circulação extracorpórea e de clampeamento da aorta foram, respectivamente, 87 e 53 minutos. Todos os lactentes utilizaram inotrópicos. As medianas dos tempos de intubação e de internação foram 72 horas e 21 dias. A taxa de mortalidade dos pacientes foi de 9,5%. Os níveis basais da molécula avaliada foram mais elevados do que aqueles considerados normais (p<0,0001. Seus níveis diminuíram significativamente ao término da circulação extracorpórea (p<0,001, voltando a aumentar significativamente 8 horas após o término desse período (p<0,005, sem, no entanto, alcançar os valores basais 26 horas depois. Conclusões: o nível sérico basal da molécula de adesão intercelular-1 solúvel é aumentado em lactentes com cardiopatias congênitas. Os níveis séricos desta molécula variam após exposição ao circuito de circulação extracorpórea, e apresentam um comportamento característico nesses pacientes.

  8. Pressão expiratória positiva na via aérea por máscara facial na hemodinâmica de pós-operatórios cardíacos Expiratory positive airway pressure in postoperative cardiac hemodynamics

    Directory of Open Access Journals (Sweden)

    Ana Claudia Borges dos Santos Sena

    2010-10-01

    Full Text Available FUNDAMENTOS: A pressão expiratória positiva na via aérea por máscara facial (EPAP é utilizada no pós-operatório de cirurgias cardíacas, entretanto, seus efeitos hemodinâmicos não foram claramente estudados. OBJETIVO: Avaliar as alterações hemodinâmicas causadas pela EPAP em pacientes pós-cirurgia cardíaca monitorados por cateter de Swan-Ganz. MÉTODOS: Foram incluídos no estudo, pacientes no primeiro ou segundo pós-operatório de cirurgia cardíaca, estáveis hemodinamicamente e com cateter de Swan-Ganz. Eles foram avaliados em repouso e após o uso de 10 cmH2O de EPAP, de forma randomizada. As variáveis estudadas foram: saturação de oxigênio, frequências cardíaca e respiratória, pressões arteriais médias sistêmica e pulmonar (PAM e PAMP, pressões venosa central (PVC e de oclusão da atéria pulmonar (POAP, débito e índice cardíacos, e resistências vasculares sistêmica e pulmonar. Os pacientes foram divididos em subgrupos (com fração de ejeção 50% e os dados foram comparados por teste t e ANOVA. RESULTADOS: Vinte e oito pacientes foram estudados (22 homens, idade média 68 ± 11 anos. Comparando o período de repouso versus EPAP, as alterações observadas foram: POAP (11,9 ± 3,8 para 17,1 ± 4,9 mmHg, p BACKGROND: Expiratory positive airway pressure (EPAP is used in after cardiac surgeries. However, its hemodynamic effects have not been clearly studied. OBJECTIVE: To evaluate the hemodynamic changes caused by EPAP in patients after cardiac surgery monitored by Swan-Ganz. METHODS: Patients at the first or second cardiac surgery postoperative period hemodynamically stable with a Swan-Ganz catheter were included in the study. They were assessed at rest and after using 10 cmH2O EPAP at random. The variables studied were: oxygen saturation, heart rate and respiratory rate, mean artery pressures and pulmonary artery mean pressures (MAP and PAMP, central venous pressure (CVP and pulmonary capillary wedge pressure

  9. Incidência de trombo intracardíaco e de tromboembolismo nos três primeiros meses após o implante de bioprótese valvar Incidence of intracardiac thrombus and thromboembolism in the first three months after bioprosthetic valve implantation

    Directory of Open Access Journals (Sweden)

    Auristela Isabel de Oliveira Ramos

    2004-12-01

    Full Text Available OBJETIVO: Avaliar a incidência de trombo intracardíaco e de tromboembolismo nos três primeiros meses após a troca valvar por bioprótese e identificar fatores de risco para a formação de trombo. MÉTODO:Incluídos 184 pacientes, entre 15 e 75 anos de idade, submetidos a implante de bioprótese e realizados ecocardiogramas transtorácico e transesofágico (ETE na fase hospitalar, média 8,4±3 dias, e três meses após, média 97,4±21,7 dias. RESULTADOS: Incidência de trombo foi significativamente mais elevada nos pacientes com prótese em posição mitral ou mitroaórtica (21,0% do que em posição aórtica (2,8%, pOBJECTIVE: To assess the incidence of intracardiac thrombus and thromboembolism in the first 3 months after bioprosthetic valve replacement and to identify the risk factors for thrombus formation. METHODS: The study comprised 184 patients, aged between 15 and 75 years, who underwent bioprosthetic valve implantation. Transthoracic and transesophageal (TEE echocardiographies were performed in the in-hospital phase (mean, 8.4±3 days and after 3 months (mean, 97.4±21.7 days. RESULTS: The incidence of thrombus was significantly greater in patients with a prosthesis in the mitral or mitroaortic position (21.0% than in those with a prosthesis in the aortic position (2.8%, P<0.001. The multiple logistic regression identified the prosthesis in the mitral or mitroaortic position as the only independent variable for thrombus formation. On the 3-month follow-up, TEE showed a thrombus in 35 (20.7% of the 169 patients on echocardiographic assessment, 31.7% in mitral patients and 3.1% in aortic patients, P<0.001. In the third month, the multiple logistic regression also identified the prosthesis in the mitral or mitroaortic position as the only independent variable for thrombus formation. During the 3-month follow-up, 3 (1.6% patients died and 8 (4.3% experienced embolic phenomena, all in the cerebral territory. CONCLUSION: The incidence

  10. Débito cardíaco e fração de ejeção fetal por meio do spatio-temporal image correlation (STIC: comparação entre fetos masculinos e femininos Fetal cardiac output and ejection fraction by spatio-temporal image correlation (STIC: comparison between male and female fetuses

    Directory of Open Access Journals (Sweden)

    Christiane Simioni

    2012-06-01

    Full Text Available OBJETIVO: Comparar do débito cardíaco (DC e a fração de ejeção (FE do coração de fetos masculinos e femininos obtidos por meio da ultrassonografia tridimensional, utilizando o spatio-temporal image correlation (STIC. MÉTODOS: Realizou-se um estudo de corte transversal com 216 fetos normais, entre 20 a 34 semanas de gestação, sendo 108 masculinos e 108 femininos. Os volumes ventriculares no final da sístole e diástole foram obtidos por meio do STIC, sendo as avaliações volumétricas realizadas pelo virtual organ computer-aided analysis (VOCAL com rotação de 30º. Para o cálculo do DC utilizou-se a fórmula: DC= volume sistólico/frequência cardíaca fetal, enquanto que para a FE utilizou-se a fórmula: FE= volume sistólico/volume diastólico final. O DC (combinado, feminino e masculino e a FE (masculina e feminina foram comparadas utilizando-se o teste t não pareado e ANCOVA. Foram criados gráficos de dispersão com os percentis 5, 50 e 95. RESULTADOS: A média do DC combinado, DC direito, DC esquerdo, FE direita e FE esquerda, para feminino e masculino, foram 240,07 mL/min; 122,67 mL/min; 123,40 mL/min; 72,84%; 67,22%; 270,56 mL/min; 139,22 mL/min; 131,34 mL/min; 70,73% e 64,76%, respectivamente; sem diferença estatística (P> 0,05. CONCLUSÕES: O DC e a FE fetal obtidos por meio da ultrassonografia tridimensional (STIC não apresentaram diferença significativa em relação ao gênero.OBJECTIVE: To compare the cardiac output (CO and ejection fraction (EF of the heart of male and female fetuses obtained by 3D-ultrasonography using spatio-temporal image correlation (STIC. METHODS: We conducted a cross-sectional study with 216 normal fetuses, between 20 and 34 weeks of gestation, 108 male and 108 female. Ventricular volumes at the end of systole and diastole were obtained by STIC, and the volumetric assessments performed by the virtual organ computer-aided analysis (VOCAL rotated 30º. To calculate the DC used the formula

  11. Cytomegalovirus and other herpesviruses infections in heart and bone marrow transplant recipients Infecções causadas por citomegalovírus e outros vírus do grupo herpes em transplantados cardíacos e de medula óssea

    Directory of Open Access Journals (Sweden)

    Adriana Weinberg

    1990-10-01

    Full Text Available From January 1988 to January 1989 all the heart transplant and bone marrow recipients at the Instituto do Coração of the Hospital das Clínicas of the University of São Paulo Medical School were studied for the incidence and morbidity associated with herpesviruses infections after transplantation. Five bone marrow and 5 heart transplant recipients were followed for a mean of 4.2 months post-transplantation. All the patients were seropositive for cytomegalovirus (CMV before admission and 80% experienced one or more recurrences during the observation period. Of the 12 episodes of CMV infection, that were identified in this study, 83% were accompanied by clinical or laboratory abnormalities. However, there was only one case of severe disease. The overall incidence of infection for herpes simplex (HSV was 50%. Although most of HSV reactivations were oral or genital, one case of HSV hepatitis occurred. One of the 6 episodes of HSV infections that were treated with acyclovir showed an unsatisfactory response and was successfully managed with ganciclovir. All the individuals had anti-varicella zoster virus antibodies, but none of them developed infection. The study emphasizes the importance of active diagnostic surveillance of herpesvirus infections in transplant patients. Both CMV and HSV reactivations showed high incidence and important morbidity and thus, deserve prophylactic therapy.De janeiro de 1988 a janeiro de 1989 todos os pacientes submetidos a transplante de coração ou de medula óssea no Instituto do Coração do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo foram estudados quanto à incidência e morbidade das infecções pós-transplante causadas por vírus do grupo herpes. Cinco recipientes de medula óssea e 5 transplantados cardíacos foram observados por um período médio de 4.2 meses após o transplante. Todos os pacientes tinham sorologia positiva para citomegalovírus (CMV antes do transplante

  12. 75 FR 29990 - Seamless Refined Copper Pipe and Tube From Mexico: Correction to Notice of Preliminary...

    Science.gov (United States)

    2010-05-28

    ... Materials (``ASTM'') ASTM-B42, ASTM- B68, ASTM-B75, ASTM-B88, ASTM-B88M, ASTM-B188, ASTM-B251, ASTM-B251M, ASTM-B280, ASTM-B302, ASTM-B306, ASTM-359, ASTM-B743, ASTM-B819, and ASTM-B903 specifications and...

  13. Transplante cardíaco pediátrico em vigência de choque cardiogênico refratário: análise crítica da viabilidade, aplicabilidade e resultados Pediatric heart transplantation in refractory cardiogenic shock: a critical analysis of feasibility, applicability and results

    Directory of Open Access Journals (Sweden)

    Marcelo Biscegli Jatene

    2008-05-01

    Full Text Available FUNDAMENTO: Considerando crianças com miocardiopatia dilatada, na lista de espera de transplante de coração, podemos avaliar a gravidade do quadro hemodinâmico desses pacientes. Alguns apresentam choque cardiogênico e um elevado índice de mortalidade. Mesmo com suporte inotrópico e respiratório, o transplante de coração é considerado uma condição de extrema gravidade. OBJETIVO: Apresentar nossa experiência com crianças na circunstância de transplante cardíaco em vigência de choque cardiogênico refratário, procurando analisar a viabilidade, a aplicabilidade e os resultados desses transplantes. MÉTODOS: De março de 2001 a fevereiro de 2004, 22 crianças com miocardiopatia dilatada, previamente registradas na lista de transplante, apresentaram choque cardiogênico, necessitando transferência para unidade de terapia intensiva (UTI pediátrica, intubação e suporte inotrópico. As idades variaram de 11 meses a 11 anos (média = 4,3 idade, com 55% do sexo masculino; 14 poderiam ser listados como prioridade clínica e os outros 8 foram excluídos da lista de espera em razão de condição clínica desfavorável. RESULTADOS: Oito transplantes de coração foram executados, 6 crianças faleceram na fila de espera (42,9%. Duas crianças faleceram (25% após o transplante; as outras 6 receberam alta hospitalar com boas condições clínicas. As duas principais complicação são rejeição, em 4 casos, e infecção, em 5 casos. Dois apresentaram complicações neurológicas, com recuperação total em um dos casos. CONCLUSÃO: Crianças com miocardiopatia e choque cardiogênico necessitam de transplante imediato; somente 57,1% podiam ser transplantadas, com mortalidade de 25%. Daquelas que sobreviveram ao transplante, a evolução clínica foi boa, similar às crianças transplantas em cirurgias eletivas.BACKGROUND: In children with dilated cardiomyopathy who are on the waiting list for heart transplantation, we evaluate the

  14. Uso de endoprótesis en el tratamiento de lesiones no oclusivas del territorio iliaco Uso de endoprótese no tratamento de lesões não-oclusivas do território ilíaco

    Directory of Open Access Journals (Sweden)

    Renato Mertens

    2006-06-01

    íacas. Entretanto, o uso desses procedimentos para tratar outros tipos de lesão ainda não foi bem estudado. Nosso objetivo é analisar indicações e resultados do uso de endoprótese em lesões ilíacas não-oclusivas. MATERIAL E MÉTODOS: Revisamos retrospectivamente os registros de 14 pacientes consecutivos, todos homens, com idade média de 61,6 anos (faixa: 25-80 anos, tratados por via endovascular entre 2001 e 2006 por lesões ilíacas não-oclusivas. O estudo pré e pós-operatório incluiu tomografia computadorizada. O procedimento foi realizado em bloco cirúrgico, utilizando um angiógrafo digital. Foi utilizado acesso femoral, com a inserção de endopróteses tubulares. RESULTADOS: Em 11 pacientes, houve embolização de artéria hipogástrica ipsilateral associada. As patologias tratadas foram: oito aneurismas ateroscleróticos, 3 dissecções, 2 lesões traumáticas e um pseudo-aneurisma anastomótico. A comorbidade mais freqüente foi hipertensão, em 43% dos casos. Não houve mortalidade operatória. Um paciente apresentou um pseudo-aneurisma femoral tratado com compressão. Um paciente tratado por fístula arteriovenosa traumática em nível ilíaco teve sua insuficiência cardíaca resolvida, com persistência assintomática de mínimo fluxo. A estada pós-operatória foi de 3 dias (média. Não se apresentaram outras endofugas inciais ou tardias. Durante um acompanhamento médio de 20,5 meses (faixa de 1 a 49 meses, um paciente morreu de câncer e nenhum requereu procedimentos complementares. CONCLUSÃO: O tratamento endovascular de lesões ilíacas através de endoprótese é seguro e permite um resultado durável no manejo de um amplo espectro de patologias.

  15. Peso dos ventrículos cardíacos determinado em necropsia de indivíduos saudáveis mortos por causas externas Cardiac ventricular weights recorded at the autopsy of healthy subjects who died of external causes

    Directory of Open Access Journals (Sweden)

    Sérgio Lamêgo Rodrigues

    2007-11-01

    Full Text Available OBJETIVO: Determinar o peso dos ventrículos cardíacos em necropsia de indivíduos sadios vítimas de morte acidental, visando determinar padrões de normalidade em nossa população. MÉTODOS: Foram examinados 94 corações no Instituto Médico Legal de Vitória. Após remoção do coração e ressecção dos átrios e gordura epicárdica, os ventrículos direito (VD e esquerdo (VE, incluindo o septo, foram separados e pesados e a massa indexada pela altura. O teste de Kolmogorov-Smirnov foi usado para testar normalidade da distribuição. Os dados são apresentados como média ± desvio padrão. RESULTADOS: Após 12 exclusões (doença cardiovascular possível detectada após a morte foram analisados 82 corações (52 homens e 30 mulheres, 16-68 anos, média 31±12 anos. O peso do VE foi de 181±25 g e 125±15 g, do VD foi de 54±7 g e 38±6 g e a massa de VE indexada pela altura foi de 105±14 g/m e 78±8 g/m para homens e mulheres, respectivamente. O P95 do peso do VE foi de 218 g e 128 g/m em homens e 148 g e 88 g/m em mulheres. Não detectamos correlação significante entre a massa ventricular e idade. CONCLUSÃO: O peso do ventrículo esquerdo do coração dos homens da nossa amostra foi superior aos relatados na literatura contemporânea. Nossos resultados sugerem que a presença de hipertrofia de VE pode ser inferida em presença de massa de VE superior a 218 g ou 128 g/m nos homens e 148 g ou 88 g/m nas mulheres.OBJECTIVE:To establish cardiac ventricular weights recorded during the autopsy of healthy individuals who died of external causes, aiming at determining normality patterns in our population. METHODS:A total of 94 hearts were evaluated at the Forensics Department of the city of Vitória, Espírito Santo. After the heart removal and resection of the atria and epicardial fat, the right ventricle (RV and the left ventricle (LV, including the septum, were separated and weighed and the mass was indexed by the height. The Kolmogorov

  16. Comparação dos efeitos da dobutamina e da milrinona sobre a hemodinâmica e o transporte de oxigênio em pacientes submetidos à cirurgia cardíaca com baixo débito cardíaco após indução anestésica Comparación de los efectos de la dobutamina y de la milrinona sobre la hemodinámica y el transporte de oxígeno en pacientes sometidos a cirugía cardiaca con bajo débito cardiaco después de inducción anestésica Comparison of the effects of dobutamine and milrinone on hemodynamic parameters and oxygen supply in patients undergoing cardiac surgery with low cardiac output after anesthetic induction

    Directory of Open Access Journals (Sweden)

    Maria José Carvalho Carmona

    2010-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Diversas classes de fármacos inotrópicos, com efeitos hemodinâmicos diferentes, são utilizadas no tratamento do baixo débito cardíaco em pacientes com disfunção sistólica submetidos a procedimento cirúrgico cardíaco. O objetivo deste estudo foi comparar o efeito da dobutamina e da milrinona sobre a hemodinâmica e o transporte de oxigênio nessa população de pacientes. MÉTODO: Após aprovação do Comitê de Ética institucional e obtenção do consentimento escrito pós-informado, 20 pacientes submetidos à cirurgia cardíaca e com índice cardíaco JUSTIFICATIVA Y OBJETIVOS: Diversas clases de fármacos inotrópicos con efectos hemodinámicos diferentes, se usan en el tratamiento del bajo débito cardíaco en pacientes con disfunción sistólica sometidos al procedimiento quirúrgico cardíaco. El objetivo de este estudio, fue comparar el efecto de la dobutamina y de la milrinona sobre la hemodinámica y el transporte de oxígeno en esa población de pacientes. MÉTODO: Después de la aprobación del Comité de Ética institucional y de la obtención del consentimiento informado, 20 pacientes sometidos a la cirugía cardíaca y con índice cardíaco BACKGROUND AND OBJECTIVES: Several classes of inotropic drugs with different hemodynamic effects are used in the treatment of low cardiac output in patients with diastolic dysfunction undergoing cardiac surgery. The objective of the present study was to compare the effects of dobutamine and milrinone on hemodynamic parameters and oxygen supply in this population of patients. METHODS: After approval by the Ethics Committee of the institution and signing of the informed consent, 20 patients undergoing cardiac surgery with cardiac index < 2 L.min-1.m2 after anesthetic induction and place ment of a pulmonary artery catheter were randomly divided to receive dobutamine 5 µg.kg-1. min-1 (n = 10, or milrinone 0.5 µg.kg-1.min-1 (n = 10. Hemodynamic parameters were

  17. Tratamento da luxação paralítica do quadril na paralisia cerebral tetraparética espástica com osteotomia do fêmur e do ilíaco sem abertura da cápsula articular (capsuloplastia Hip dislocation treatment in cerebral palsy patients with spastic quadriplegia with femoral and pelvic osteotomies, without opening of the joint capsule (capsuloplasty

    Directory of Open Access Journals (Sweden)

    Fernando Farcetta Junior

    2010-01-01

    Full Text Available OBJETIVO: Mostrar o planejamento pré-operatório, e os resultados do tratamento cirúrgico da luxação paralítica do quadril em pacientes com paralisia cerebral. A técnica utilizada foi a osteotomia derrotatória e varizante do fêmur proximal, associada à osteotomia do ilíaco tipo Dega, sem abertura da cápsula articular. MÉTODOS: Realizamos um estudo retrospectivo de 10 quadris em oito pacientes com paralisia cerebral tipo tetraparesia espástico, submetidos a tratamento cirúrgico entre 2003 e 2005 com a mesma técnica cirúrgica. Foram avaliados parâmetros clínicos e radiográficos pré e pós-operatórios, bem como o planejamento pré-operatório com uso do intensificador de imagem. Os parâmetros clínicos analisados foram: dor, dificuldade de higiene e dificuldade de posicionamento. Os parâmetros radiológicos foram os índices de Reimers, índice acetabular e ângulo cervicodiafisário. Estes resultados foram submetidos a análise estatística. RESULTADOS: Obtivemos bons resultados com esta técnica. Com um seguimento médio de três anos, todos os quadris estavam reduzidos na última consulta, com alto grau de satisfação dos familiares, em relação ao tratamento. Além disso, mostramos que o planejamento pré-operatório com uso do intensificador de imagem nos permite a redução e estabilização desses quadris sem a necessidade de capsuloplastia. CONCLUSÃO: Os autores concluíram que no tratamento da luxação do quadril dos pacientes com paralisia cerebral tetraparéticos espásticos com o planejamento pré-operatório, não é necessária a capsuloplastia para estabilização da articulação coxofemoral.OBJECTIVES: To show the preoperative planning and the results of surgical treatment for paralytic hip dislocation in children with cerebral palsy. The techniques used were proximal femoral varus derotation osteotomy and Dega osteotomy without opening of the joint capsule. METHODS: We performed a retrospective review of

  18. Avaliação do peptídeo natriurético tipo B no diagnóstico de rejeição após transplante cardíaco pediátrico Evaluación del péptido natriurético tipo B en el diagnóstico de rechazo tras transplante cardiaco pediátrico B-type natriuretic peptide assessment in the diagnosis of rejection after pediatric heart transplant

    Directory of Open Access Journals (Sweden)

    Cristina de Sylos

    2009-03-01

    Full Text Available FUNDAMENTO: A rejeição constitui-se em uma das principais causas de mortalidade após o transplante cardíaco pediátrico. O peptídeo natriurético tipo B (BNP tem sido estudado como método no diagnóstico de rejeição aguda, especialmente em pacientes adultos submetidos a transplante cardíaco. OBJETIVO:Correlacionar o nível sérico de BNP à rejeição aguda diagnosticada pela biópsia endomiocárdica em pacientes do grupo de transplante cardíaco pediátrico. MÉTODOS:Foram coletadas 50 amostras de BNP de 33 crianças em pós-operatório de transplante cardíaco e analisados dados de idade, sexo, cor, grupo sangüíneo, painel imunológico, tempo de evolução após o transplante, classe funcional, imunossupressão utilizada e número de rejeições. RESULTADOS:Foram 33 crianças com idade mediana de 10,13 anos, predomínio do sexo feminino (54% e da cor branca (78%. No momento da dosagem de BNP o tempo médio de transplante foi 4,25 anos. A biópsia endomiocárdica diagnosticou nove rejeições em oito pacientes (27%, sendo três com grau 3 A, cinco com grau 2 e um com rejeição humoral. No momento da biópsia, a maioria dos pacientes encontrava-se assintomática. O nível sérico de BNP foi em média 77,18 pg/ml, sendo 144,22 pg/ml no grupo com rejeição e 62,46 pg/ml no grupo sem rejeição, com p = 0,02. CONCLUSÃO: Crianças assintomáticas podem apresentar rejeição aguda no pós-operatório de transplante cardíaco. O nível sérico de BNP apresentou diferença estatisticamente significante no grupo com rejeição, podendo ser método adicional no diagnóstico de rejeição cardíaca.FUNDAMENTO: El rechazo constituye una de las principales causas de mortalidad tras el transplante cardiaco pediátrico. El péptido natriurético tipo B (BNP ha sido estudiado como método en el diagnóstico de rechazo agudo, sobre todo en pacientes adultos sometidos a transplante cardiaco. OBJETIVO:Correlacionar el nivel sérico de BNP al rechazo

  19. ACOS GOSAT/TANSO-FTS Level 2 Full Physics Standard Product V7.3 (ACOS_L2S) at GES DISC

    Data.gov (United States)

    National Aeronautics and Space Administration — Version 7.3 is the current version of the data set. Version 3.5 is no longer available and has been superseded by Version 7.3. This data set is currently provided by...

  20. Numerical modelling of Charpy-V notch test by local approach to fracture. Application to an A508 steel in the ductile-brittle transition range

    International Nuclear Information System (INIS)

    Tanguy, B.

    2001-07-01

    Ferritic steels present a transition of the rupture mode which goes progressively of a brittle rupture (cleavage) to a ductile rupture when the temperature increases. The following of the difference of the transition temperature of the PWR vessel steel by the establishment of toughness curves makes of the Charpy test an integrating part of the monitoring of the French PWR reactors. In spite of the advantages which are adapted to it in particular its cost, the Charpy test does not allow to obtain directly a variable which characterizes a crack propagation resistance as for instance the toughness used for qualifying the mechanical integrity of a structure. This work deals with the establishment of the through impact strength-toughness in the transition range of the vessel steel: 16MND5 from a non-empirical approach based on the local approach of the rupture. The brittle rupture is described by the Beremin model (1983), which allows to describe the dispersion inherent in this rupture mode. The description of the brittle fissure is carried out by the GTN model (1984) and by the Rousselier model (1986). This last model has been modified in order to obtain a realistic description of the brittle damage in the case of fast solicitations and of local heating. The method proposed to determine the parameters of the damage models depends only of tests on notched specimens and of the inclusion data of the material. The behaviour is described by an original formulation parametrized in temperature which allows to describe all the tests carried out in this study. Before using this methodology, an experimental study of the behaviour and of the rupture modes of the steel 16MND5 has been carried out. From the toughness tests carried out in quasi-static and dynamical conditions, it has been revealed that this steel does not present important unwedging of its toughness curve due to the velocity effect. In the transition range, local heating of about 150 C have been measured in the root of the notch as well as plastic deformations superior to 100%. After a fractography study allowing to identify the nature of the sites which lead to the cleavage initiation, the numerical study shows, particularly, the effect of the adiabatic heating and the taking into account of the growth of cavities around a second population of particles (carbides) on the ductile fissure. The application of the proposed methodology allows to describe the resilience data until middle energies of about 70 J. Beyond, an appearing weak dependency of the cleavage constraint with temperature has to be introduced. On the other hand, the evolving of the toughness can be described until middle values of 170 MPa/m without introducing dependency of the cleavage constraint with temperature. (O.M.)

  1. 77 FR 59178 - Seamless Refined Copper Pipe and Tube From Mexico: Final Results of Antidumping Duty New Shipper...

    Science.gov (United States)

    2012-09-26

    ... (``ASTM'') ASTM-B42, ASTM-B68, ASTM- B75, ASTM-B88, ASTM-B88M, ASTM-B188, ASTM-B251, ASTM-B251M, ASTM-B280, ASTM-B302, ASTM-B306, ASTM-359, ASTM-B743, ASTM-B819, and ASTM-B903 specifications and meeting the...

  2. Doença celíaca: avaliação da obediência à dieta isenta de glúten e do conhecimento da doença pelos pacientes cadastrados na Associação dos Celíacos do Brasil (ACELBRA Celiac disease: evaluation of compliance to a gluten-free diet and knowledge of the disease in celiac patients registered at the Brazilian Celiac Association (BCA

    Directory of Open Access Journals (Sweden)

    Vera Lucia SDEPANIAN

    2001-10-01

    Full Text Available Racional — A obediência à dieta isenta de glúten previne a ocorrência de complicações malignas e não-malignas. Objetivo - Avaliar a obediência à dieta isenta de glúten e o conhecimento teórico acerca da doença celíaca e seu tratamento pelos pacientes cadastrados na Associação dos Celíacos do Brasil (ACELBRA. Métodos - Foi enviado por correio um questionário a respeito da obediência à dieta isenta de glúten e do conhecimento teórico da doença celíaca e seu tratamento a 584 membros cadastrados na ACELBRA. Resultados - Dos 534 (91,4% questionários recebidos, foram analisados 529 (90,6%. Quanto à obediência à dieta, 69,4% dos pacientes responderam que nunca ingerem glúten e 29,5% que não obedecem à dieta. A proporção de pacientes que ingerem glúten freqüentemente ou sem restrição alguma é maior entre aqueles com idade igual ou maior a 21 anos (17,7% do que os com idade menor (9,9%. A freqüência de obediência à dieta foi maior quando o intervalo de tempo em que foi estabelecido o diagnóstico da doença foi inferior a 5 anos. O intestino delgado foi assinalado como o principal órgão afetado na doença celíaca por 82% dos pacientes. Os principais sintomas assinalados foram diarréia (96,6%, emagrecimento (93,4%, barriga inchada (90,4%, anemia (68,1% e vômitos (59,6%. Apenas 59,0% concordaram com a existência de predisposição genética. Segundo 90,4% das respostas, a doença é permanente e 96,2% assinalaram que a dieta deve ser totalmente isenta de glúten; 67,1% responderam que o glúten é uma proteína que está presente, segundo 92,1% dos inquéritos, no trigo, centeio, cevada e aveia. Observou-se maior proporção de obediência à dieta quando há conhecimento da doença e dieta. A biopsia de intestino delgado foi considerada necessária por apenas 67,5% dos pacientes, observando-se maior freqüência de obediência à dieta nos pacientes que realizaram pelo menos uma biopsia de intestino delgado

  3. Importância da troponina-I cardíaca nos portadores de obstrução no tronco da artéria coronária esquerda sem evento cardíaco prévio Importance of cardiac troponin-I in the preoperative period of patients without prior cardiac events but suffering from left coronary branch obstruction

    Directory of Open Access Journals (Sweden)

    Domingo M. Braile

    2004-12-01

    Full Text Available OBJETIVO: Avaliar a importância dos níveis séricos de troponina I-cardíaca no pré-operatório de pacientes portadores de obstrução no tronco da artéria coronária esquerda (OTCE sem evento cardíaco prévio. MÉTODO: Foram analisados os níveis séricos da troponina I-cardíaca de 115 pacientes com doença coronariana obstrutiva, com idade variando entre 32 e 81 anos (média e desvio-padrão de 59,7±10,5 anos. Os pacientes foram divididos em dois grupos: Grupo A - 41 pacientes portadores de OTCE, variando o grau de obstrução entre 20% de perda do diâmetro e subtotal (moda de 60%; Grupo B - 74 pacientes sem OTCE. Todos os pacientes foram submetidos a cineangiocoronariografia de forma eletiva e não apresentavam infarto agudo do miocárdio prévio. O método empregado na dosagem da troponina-I cardíaca foi o da Quimioluminiscência, admitindo-se como valor normal abaixo de 0,1 nanogramas por mililitro (ng/ml. RESULTADOS: Não houve correlação entre o grau de OTCE e os níveis séricos de troponina-Ic (P= 0,4617, porém a média dos níveis séricos da troponina-I nos grupos A e B foi, respectivamente, 0,3841 ng/ml e 0,1711 ng/ml (P=0,0324; teste de Mann-Whithey; OR= 4,44 (IC95% 1,60 _ 12,31. CONCLUSÕES: Os pacientes do grupo A têm 3,44 vezes mais chance de apresentar lesão miocárdica representada por elevação de troponina I-cardíaca que o grupo B, independente do grau da OTCE. A sensibilidade para suspeita clínica de mionecrose foi relativamente baixa (31,7%, porém a especificidade foi elevada (90,5%. Destaca-se, entretanto, a importância clínica da documentação de mionecrose em uma determinada porcentagem de pacientes com lesão de tronco, sem constatação eletrocardiográfica. Assim, os pacientes com OTCE devem ser submetidos com rapidez a procedimento operatório, a fim de evitar extensão da mionecrose.OBJECTIVE: To evaluate the importance of cardiac troponin-I serum levels in the preoperative period of patients

  4. Fatigue crack propagation in neutron-irradiated ferritic pressure-vessel steels

    International Nuclear Information System (INIS)

    James, L.A.

    1977-01-01

    The results of a number of experiments dealing with fatigue crack propagation in irradiated reactor pressure-vessel steels are reviewed. The steels included ASTM alloys A302B, A533B, A508-2, and A543, as well as weldments in A543 steel. Fluences and irradiation conditions were generally typical of those experienced by most power reactors. In general, the effect of neutron irradiation on the fatigue crack propagation behavior of these steels was neither significantly beneficial nor significantly detrimental

  5. Non typical results of the first and second irradiation set of the surveillance programme of a boiling water reactor in Switzerland

    Energy Technology Data Exchange (ETDEWEB)

    Ullrich, G; Krompholz, K [Paul Scherrer Inst. (PSI), Villigen (Switzerland)

    1994-12-31

    In the surveillance programme for the pressure vessel of the Muhleberg NPP in Switzerland, tensile and impact tests on the base material (ASTM A 508 Cl 2) and two weldments (main and automatic) as well as the heat affected zone, were performed with two sets of irradiation (neutron fluence of 5.5.10{sup 17} and 1.1.10{sup 18}) leading to different shifts of the transition temperature (except for the automatic welded joints which keep the same large shift). Results and causes of the discrepancy are discussed. (authors). 6 figs., 2 tabs.

  6. Study of radiation damage of steels for light water pressure vessels at UJV

    International Nuclear Information System (INIS)

    Vacek, N.; Stoces, B.

    1980-01-01

    Preoperational determination of radiation resistance of pressure vessel steels is performed at accelerated neutron exposure in a test or materials research reactor. The results obtained at accelerated and operating exposure are not fully identical and surveillance bodies are therefore used manufactured from the pressure vessel material. Currently, the following steels are used for the manufacture of light water reactor pressure vessels: Mn-Mo-Ni (ASTM-A533-B, ASTM-A508), Cr-Mo-V (15Kh2M1FA). At UJV Rez, for irradiation Chanca-M probes imported from France are used featuring electric temperature control. Almost identical radiation embrittlement was measured for all three steels after irradiation with a neutron fluence of 3x10 23 n.m -2 at a temperature of 290 degC. (H.S.)

  7. Fretting corrosion tests on orthopedic plates and screws made of ASTM F138 stainless steel

    OpenAIRE

    Santos,Claudio Teodoro dos; Barbosa,Cássio; Monteiro,Maurício de Jesus; Abud,Ibrahim de Cerqueira; Caminha,Ieda Maria Vieira; Roesler,Carlos Rodrigo de Mello

    2015-01-01

    Introduction Although there has been significant progress in the design of implants for osteosynthesis, the occurrence of failures in these medical devices are still frequent. These implants are prone to suffer from fretting corrosion due to micromotion that takes place between the screw heads and plate holes. Consequently, fretting corrosion has been the subject of research in order to understand its influence on the structural integrity of osteosynthesis implants. The aim of this paper is t...

  8. ASTM Committee G-4 metals flammability test program - Data and discussion

    Science.gov (United States)

    Stoltzfus, Joel M.; Homa, John M.; Williams, Ralph E.; Benz, Frank J.

    1988-01-01

    Results of metals flammability tests performed on twenty-six metals in the NASA/White Sands Test Facility are discussed together with the test systems. The promoted combustion and ignition characteristics of these metals are described, and the metals are ranked according to their suitability for use in oxygen systems. In general, alloys with high copper and nickel contents and low iron content were found to rank higher than those that had high iron content, while alloys that had high aluminum content were ranked the lowest.

  9. ASTM F1717 standard for the preclinical evaluation of posterior spinal fixators: can we improve it?

    Science.gov (United States)

    La Barbera, Luigi; Galbusera, Fabio; Villa, Tomaso; Costa, Francesco; Wilke, Hans-Joachim

    2014-10-01

    Preclinical evaluation of spinal implants is a necessary step to ensure their reliability and safety before implantation. The American Society for Testing and Materials reapproved F1717 standard for the assessment of mechanical properties of posterior spinal fixators, which simulates a vertebrectomy model and recommends mimicking vertebral bodies using polyethylene blocks. This set-up should represent the clinical use, but available data in the literature are few. Anatomical parameters depending on the spinal level were compared to published data or measurements on biplanar stereoradiography on 13 patients. Other mechanical variables, describing implant design were considered, and all parameters were investigated using a numerical parametric finite element model. Stress values were calculated by considering either the combination of the average values for each parameter or their worst-case combination depending on the spinal level. The standard set-up represents quite well the anatomy of an instrumented average thoracolumbar segment. The stress on the pedicular screw is significantly influenced by the lever arm of the applied load, the unsupported screw length, the position of the centre of rotation of the functional spine unit and the pedicular inclination with respect to the sagittal plane. The worst-case combination of parameters demonstrates that devices implanted below T5 could potentially undergo higher stresses than those described in the standard suggestions (maximum increase of 22.2% at L1). We propose to revise F1717 in order to describe the anatomical worst case condition we found at L1 level: this will guarantee higher safety of the implant for a wider population of patients. © IMechE 2014.

  10. Microstructure and Mechanical Properties of ASTM A743 CA6NM Steel Welded by FCAW Process

    OpenAIRE

    Silva, Rafael de Paula; Faria, Maria Ismenia Sodero Toledo; Almeida, Luiz Fernando Cursino Briet de; Nunes, Carlos Angelo; Vieira, Décio; Borges Júnior, Wanderlei

    2017-01-01

    CA6NM steel is widely used in the manufacture of hydraulic turbines metallic parts, due to its resistance to corrosion and cavitation damage, combined with good weldability and fatigue properties. However, welding of this type of steel is complex and to ensure a minimum residual stress after welding it is necessary perform a post welding heat treatment (PWHT) of the part. This study aims to analyze the effect of a PWHT on the microstructure and mechanical properties of CA6NM steel weld joint ...

  11. Status report on activities of ASTM E10.05.01 Task Group on Uncertainty Analysis

    International Nuclear Information System (INIS)

    Kam, F.B.K.; Stallman, F.W.

    1979-01-01

    Uncertainties in the field of reactor dosimetry are analyzed. A survey on uncertainty analysis as it is practiced at leading laboratories which are involved in reactor dosimetry is described. A questionnaire was prepared and mailed to about 45 installations and researchers. Nine replies were received, several of them were prepared by more than one author. Three of the nine came from installations outside the US. Results and the questionnaire are presented

  12. 78 FR 13243 - Updates to Standards Incorporated by Reference; Reapproved ASTM Standards; Technical Amendment

    Science.gov (United States)

    2013-02-27

    ... Characteristics of Plastic Film 2009)[egr]1. and Sheeting. Standard Specification for F682-82a F682-82a 46 56.01-2... (Reapproved Standard Test Method for Determining Gas 2009)[egr]1. Permeability Characteristics of Plastic Film... Permeability Characteristics of Plastic Film and Sheeting (approved May 1, 2009), incorporation by reference...

  13. Microbiological corrosion of ASTM SA105 carbon steel pipe for industrial fire water usage

    Science.gov (United States)

    Chidambaram, S.; Ashok, K.; Karthik, V.; Venkatakrishnan, P. G.

    2018-02-01

    The large number of metallic systems developed for last few decades against both general uniform corrosion and localized corrosion. Among all microbiological induced corrosion (MIC) is attractive, multidisciplinary and complex in nature. Many chemical processing industries utilizes fresh water for fire service to nullify major/minor fire. One such fire water service line pipe attacked by micro-organisms leads to leakage which is industrially important from safety point of view. Also large numbers of leakage reported in similar fire water service of nearby food processing plant, paper & pulp plant, steel plant, electricity board etc…In present investigation one such industrial fire water service line failure analysis of carbon steel line pipe was analyzed to determine the cause of failure. The water sample subjected to various chemical and bacterial analyses. Turbidity, pH, calcium hardness, free chlorine, oxidation reduction potential, fungi, yeasts, sulphide reducing bacteria (SRB) and total bacteria (TB) were measured on water sample analysis. The corrosion rate was measured on steel samples and corrosion coupon measurements were installed in fire water for validating non flow assisted localized corrosion. The sulphide reducing bacteria (SRB) presents in fire water causes a localized micro biological corrosion attack of line pipe.

  14. Prediction of long term crevice corrosion and hydrogen embrittlement behavior of ASTM grade-12 titanium

    International Nuclear Information System (INIS)

    Ahn, T.M.; Jain, H.

    1984-01-01

    Crevice corrosion and hydrogen embrittlement are potential failure modes of Grade-12 titanium high-level nuclear waste containers emplaced in rock salt repositories. A method is presented to estimate the environment domains for which immunity to these failure modes will exist for periods of hundreds of years. The estimation is based on the identification and quantification of mechanisms involved. Macroscopic concentration cell formation is responsible for crevice corrosion. The cell formation is accompanied by oxygen depletion, potential drop, anion accumulation and acidification inside the crevice. This process is quantified by simple mass balance equations which show that the immunity domain is a function of the time the container is exposed to the corrosion environment. Strain induced hydride formation is responsible for hydrogen assisted crack initiation. A simple model for slow crack growth is developed using data on growth rates measured at various temperatures. The parameters obtained in the model are used to estimate the threshold stress intensity and hydrogen solubility limit in the alloy at infinite container service time. This value gives a crack size below which container failure will not occur for a given applied stress and hydrogen concentration, and a hydrogen concentration limit at a given stress intensity. 37 references, 5 figures, 4 tables

  15. Uusi momente tsiviilasja menetlemisel esimese astme kohtus / Donald Kiidjärv

    Index Scriptorium Estoniae

    Kiidjärv, Donald, 1962-

    1998-01-01

    Põhiseaduslikust õigusest olla oma kohtuasja lahendamise juures, asja õigest ja kiirest läbivaatamisest, kohtualluvusest, hagiavaldusest, hagi tagamisest, eelmenetlusest, kohtuistungist, kohtuotsusest ja -määrusest, tagaseljaotsusest ning hagita menetlusest, eelistungist

  16. 77 FR 50113 - ASTM International-Food and Drug Administration Workshop on Absorbable Medical Devices: Lessons...

    Science.gov (United States)

    2012-08-20

    ... disability, please contact Cindy Garris, Food and Drug Administration, 10903 New Hampshire Ave., Bldg. 66, rm... that the implant must withstand and perform. Moreover, the optimal preclinical/bench testing paradigm...

  17. Estudio de tolerancia de daño de uniones soldadas de acero ASTM A36

    Directory of Open Access Journals (Sweden)

    Luis E. Cepeda

    1998-09-01

    Full Text Available La tolerancia de daño en una soldadura, evaluada como un tamaño de grieta admisible, depende de la combinación de las propiedades mecánicas de tenacidad de fractura y resistencia de la correspondiente zona metalúrgica de estudio. Para unas condiciones dadas de trabajo, la tolerancia de daño aumenta con el incremento de la tenacidad de fractura en el caso que el modo de falla sea por fractura, o con el aumento de la resistencia al flujo plástico, en el caso que la falla sea por colapso plástico. La falla por colapso plástico se ve favorecida por una tenacidad de fractura alta, una resistencia baja y un espesor de soldadura pequeño. Para los procesos y condiciones de soldadura empleados en este trabajo, se encuentra que a temperatura ambiente la zona de fusión y la zona afectada por el calor presentan mayor tenacidad de fractura que el metal base sin una variación sensible de la resistencia, lo cual se traduce en una tolerancia de daño mayor en esas zonas. En la región de la temperatura de transición para el proceso de arco manual, la tenacidad de fractura de la zona de fusión y de la zona afectada por el calor es mayor que la tenacidad de fractura del metal base, mientras que para el proceso de arco sumergido sucede lo contrario.

  18. Theoretical analysis of two ACO approaches for the traveling salesman problem

    DEFF Research Database (Denmark)

    Kötzing, Timo; Neumann, Frank; Röglin, Heiko

    2012-01-01

    Bioinspired algorithms, such as evolutionary algorithms and ant colony optimization, are widely used for different combinatorial optimization problems. These algorithms rely heavily on the use of randomness and are hard to understand from a theoretical point of view. This paper contributes...... to the theoretical analysis of ant colony optimization and studies this type of algorithm on one of the most prominent combinatorial optimization problems, namely the traveling salesperson problem (TSP). We present a new construction graph and show that it has a stronger local property than one commonly used...... for constructing solutions of the TSP. The rigorous runtime analysis for two ant colony optimization algorithms, based on these two construction procedures, shows that they lead to good approximation in expected polynomial time on random instances. Furthermore, we point out in which situations our algorithms get...

  19. Project of a photoelectron X-ray microscope on ACO storage ring

    International Nuclear Information System (INIS)

    Polack, F.; Lowenthal, S.

    1983-01-01

    A photoelectron X-ray microscope is described which is based on the principles of contact X-ray imaging and of image converters. An X-ray image is projected by a parallel X-ray beam on a thin transmission photocathode. The emitted electrons are accelerated and imaged at large magnification by an emission microscope. The instrument, which is presently under construction, is designed to provide high resolution. An electron velocity filter has been added to the usual cross-over aperture so as to reduce the spherochromatic aberration, and the cathode lens has been designed to reduce field curvature. Resolution and detection efficiency of Au and CsI cathodes are compared. The interest of the instrument for soft X-ray microscopy is briefly discussed. (orig.)

  20. Non-line-of-sight ultraviolet communication based on DHT ACO-OFDM

    Science.gov (United States)

    Gao, Qian; Chen, Gang

    2012-10-01

    Free space optical (FSO) communication has attracted tremendous research interest in the recent year. Most existing works focus only on the line-of-sight (LOS) transmission by infrared (IR) or visible light lasers/LEDs, while this article suggested a framework of non-line-of-sight (NLOS) FSO, motivated by our recent experimental results on the successful transmission of NLOS ultraviolet (UV) beams for up to kilometers, which is comparable to the typical distance a LOS FSO transmission. The NLOS provides an alternate path when the LOS path is shadowed or is highly attenuated. In order to mitigate the multipath dispersion of the NLOS FSO, a baseband orthogonal frequency division multiplexing (OFDM) modulation scheme was proposed, based on Discrete Hartley Transform (DHT) and asymmetric clipping to guarantee the positive-realness of the transmitted optical intensity. The proposed system could reduce the hardware complexity of transmitter and receiver. Minimum mean square error (MMSE) precoder was applied before the DHT to remove the crosstalk between subcarriers, i.e. the frequency domain orthogonality of OFDM was preserved. Performance of the BPSK modulated communication system was given under lognormal atmospheric turbulence for demonstration of the feasibility of the proposed method.