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Sample records for base na geoquimica

  1. Crustal evolution of South American Platform based on Sm-Nd isotope geochemistry; Evolucao crustal da plataforma sul americana com base na geoquimica isotopica Sm-Nd

    Energy Technology Data Exchange (ETDEWEB)

    Sato, Kei

    1998-07-01

    Sm-Nd isotopic systematics is relevant to the topics of origin and evolution the of continental crust, where model ages refer to the time when crustal material was differentiated from the upper mantle. Alternative interpretations are due to a lack of adequate information on crustal processes and the variable composition of the mantle sources. The Sm-Nd methods are presented, and applied on rock materials from the South American Platform. The main conclusions indicate juvenile accretion with higher growth rates (peaks), around 3.7-3.5 Ga ({approx} 0.5% in volume), 3.1 - 2.9 Ga ({approx}16%), 2.7 - 2.6 ({approx} 9%), 2.2 - 1.9 (35%) and 1.3-1.0 (7%). The continental growth curve indicates that about 35 % of the crust was formed by 2.5 Ga, 88% by 1.8 Ga and 99% by 1.0 Ga, and the remaining {approx} 1 % was added in the Phanerozoic. Rapid crustal growth occurred between 2.2 and 1.9 Ga. The main period of continental crust formation occurred during the Paleoproterozoic, corresponding to 54 % in volume. Sm-Nd model ages, when compared with the crystallisation ages of granitoid rocks, furnish a rough estimate of juvenile vs. reworked material. Within the South American Platform about 45% of juvenile continental crust is still preserved within tectonic provinces of different ages. The remainder represents continental crust reworked in younger tectono-thermal events. In particular crustal reworking was predominating over juvenile accretion during Meso-Neoproterozoic. The Transbrasiliano Lineament is a megasuture, active in the Neoproterozoic, which separates a large northwestern mass, including the Amazonian and Sao Luis Cratons, from a southeastern mass, formed by a collage of cratonic fragments, of which the Sao Francisco and Rio de La Plata are the largest. The crustal evolutions of these two large continental masses are considered individually, and can be resumed following form: I - Old Archean rocks (>3.4 Ga) are found only within the south-eastern part (Gaviao Block, Contendas-Mirante Complex (Sao Francisco Craton) and Caldas Brandao Massif (Borborema Province); 2 - On both continental masses, crustal evolution between 3.0 and 1.7 Ga is very similar; 3 - During Meso and Neoproterozoic times, the northwestern mass (Amazonian and Sao Luis Cratons) remained virtually unaffected by tectono-orogenic events, while the southeastern mass is composed of smaller cratonic fragments, which later took part in the formation of two large supercontinents: Rodinia during the Mesoproterozoic, and Gondwana in the Neoproterozoic. (author)

  2. Geochemistry of the thermal springs from Piedras de Lumbre Zone, Chihuahua, Mexico; Geoquimica de los manantiales termales de la zona de Piedras de Lumbre, Chihuahua, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Tello Hinojosa, Enrique [Gerencia de Proyectos Geotermoelectricos de la Comision Federal de Electricidad, Morelia (Mexico)

    1996-01-01

    Chemical analysis of water produced by 12 hot springs in the geothermal areas of Recubichi and Piedras de Lumbre, Chihuahua, Mexico were carried out in order to establish the geochemical characteristic of the groundwater and to know their interaction with deeper geothermal fluids. We made two sampling of water and gases in 1984 and 1995. The chemical composition of waters produced by the springs is of sulfate alkaline type. It was found, according to the Na:K:Mg relative content that most hot springs are located in the partial equilibrium zone, whereas the lowest temperature hot springs shift toward the groundwaters domain. The temperature estimated from gas geothermometry was 187 degrees celsius. It was found that the He has a deep origin, whereas the N{sub 2} is of atmospheric origin. Methane was not detected, suggesting that equilibria between gases and the liquid phase was reached at temperatures over 150 degrees celsius. The chemical compositions for the springs at Recubichi and Piedras de Lumbre zones are similar, so, it suggests that they have the same origin. The water quality of the springs for agricultural use, is classified between C2-S2 and C2-S3 types, that suggest that this water can be used for irrigation. The arsenic element was not detected and the concentration for the boron element is lower that 0.175 ppm. [Espanol] Los analisis quimicos de agua de 12 manantiales y 4 fumarolas de las zonas de Recubichi y Piedras de Lumbre, Chihuahua, Mexico fueron estudiados con el fin de conocer las caracteristicas geoquimicas del acuifero somero y su interaccion con fluidos geotermicos. Se realizaron 2 muestreos tanto de agua como de gases en 1984 y 1995. En ambos muestreos se encontro que la composicioon quimica del agua de todos los manantiales es del tipo sulfatado-sodico. De acuerdo con el contenido relativo de Na:K:Mg el agua de los manantiales mas calientes (93 grados celsius), se ubica en la zona de equilibrio parcial, mientras que en los de menor

  3. Geochemistry of the thermal springs from San Antonio El Bravo zone, Chihuahua, Mexico; Geoquimica de manantiales termales de la zona de San Antonio El Bravo, Chihuahua, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Tello Hinojosa, Enrique [Gerencia de Proyectos Geotermoelectricos de la Comision Federal de Electricidad, Morelia (Mexico)

    1996-05-01

    Isotopic and chemical analysis o water produced by 14 springs in the San Antonio El Bravo, Chihuahua, Mexico geothermal area, were carried out in order to establish the geochemical characteristics of the groundwater and to know their interaction with deeper geothermal fluids. We made two samplings of water and gases in 1984 and 1995. The chemical composition of waters produced by the springs in of sodium-bicarbonate-chloride type. It was found, according to the Na:K:Mg relative content, that most hot springs are located in the partial equilibrium zone, whereas the lowest temperature hot springs shift toward the groundwaters domain. The temperature estimated from gas geothermometry was 129 degrees celsius. The isotopic composition at Ojo Caliente and Infiernito springs presents enrichment in {delta}{sup 18}O, product rock-water interaction at high temperature. The Agua Roque spring is located in the line of meteoric waters. Analysis of metals was carried out too, the concentration of gold element is 0.09 mg/l in Ojo Caliente and Infiernito springs, whereas silver, aluminum and iron elements were not detected. The water quality of the springs for agricultural use, is classified between C2-S1, C3-S1, C3- S2, C4-S3 and C4-S4 types, that suggests that only the water from Agua Roque can be used for irrigation. The arsenic element was not detected but the concentration of the boron element is high for irrigation use (2.39 ppm). [Espanol] Los analisis quimicos e isotopicos de agua de 14 manantiales de la zona de San Antonio El Bravo. Chihuahua, Mexico, fueron realizados con el fin de conocer las caracteristicas geoquimicas del acuifero somero y su interaccion con fluidos geotermicos. Se realizaron 2 muestreos tanto de agua como de gases en 1984 y 1995. En ambos muestreos se encontro que la composicion quimica del agua de todos los manantiales es del tipo bicarbonatado-clorurado-sodico. De acuerdo con el contenido relativo de Na:K:Mg el agua de los manantiales mas calientes

  4. Geologic evolution of the Paraiba do Sul complex, in the central part of the Ribeira belt, based on the geochemistry and U-Pb geochronology studies; Evolucao geologica do complexo Paraiba do Sul, no segmento central da faixa Ribeira, com base em estudos de geoquimica e geocronologia U-Pb

    Energy Technology Data Exchange (ETDEWEB)

    Valladares, Claudia Sayao

    1996-12-31

    Aiming the definition of the Complexo Paraiba do Sul evolution, the work presents a geochronological approach by the U-Pb method, considered appropriate to study polideformed terrains. The minerals used to the U-Pb dating (zircon, titanite and monazite) provides information about the ages of rock generation and the successive geological events the rocks were submitted. The U-Pb geochronological approach is pioneer in the investigated area and two questions referent to the Complexo Paraiba do Sul evolution in the central part of the Ribeira belt, were the aim of this approach. The first of them refers to the crystallization epoch and the gneisses metamorphism, interpreted here like orthogneisses, called Unidade Quirino of the Complexo Paraiba do Sul. The second refers to the metamorphism ages and meta sedimentary unit deformation. Looking for the contribution to the Complexo Paraiba do Sul evolution understanding, this work presents the data based on the geologic map of this area, comprising part of the Folha Volta Redonda (1:50.000), including petrographic, structural and microtectonic studies. It also presents and discusses the results of: 17 U-Pb analysis in zircon and titanite of the Complexo Paraiba do Sul orthogneisses collection; 24 geochemical analysis of major, minor, trace elements and ETR of the same collection; an U-Pb analysis in titanite of the Unidade Sao Joao, 5 U-Pb analysis in titanites and/or monazites of granites and granitoids; 12 geochemical analysis including major, minor and trace elements and ETR, in granites and sills of leucogranites. Finally, the data achieved were integrated with the objective to elaborate an evolutive view of the Complexo Paraiba do Sul 157 refs., 54 figs., 17 tabs.

  5. Geologic evolution of the Paraiba do Sul complex, in the central part of the Ribeira belt, based on the geochemistry and U-Pb geochronology studies; Evolucao geologica do complexo Paraiba do Sul, no segmento central da faixa Ribeira, com base em estudos de geoquimica e geocronologia U-Pb

    Energy Technology Data Exchange (ETDEWEB)

    Valladares, Claudia Sayao

    1997-12-31

    Aiming the definition of the Complexo Paraiba do Sul evolution, the work presents a geochronological approach by the U-Pb method, considered appropriate to study polideformed terrains. The minerals used to the U-Pb dating (zircon, titanite and monazite) provides information about the ages of rock generation and the successive geological events the rocks were submitted. The U-Pb geochronological approach is pioneer in the investigated area and two questions referent to the Complexo Paraiba do Sul evolution in the central part of the Ribeira belt, were the aim of this approach. The first of them refers to the crystallization epoch and the gneisses metamorphism, interpreted here like orthogneisses, called Unidade Quirino of the Complexo Paraiba do Sul. The second refers to the metamorphism ages and meta sedimentary unit deformation. Looking for the contribution to the Complexo Paraiba do Sul evolution understanding, this work presents the data based on the geologic map of this area, comprising part of the Folha Volta Redonda (1:50.000), including petrographic, structural and microtectonic studies. It also presents and discusses the results of: 17 U-Pb analysis in zircon and titanite of the Complexo Paraiba do Sul orthogneisses collection; 24 geochemical analysis of major, minor, trace elements and ETR of the same collection; an U-Pb analysis in titanite of the Unidade Sao Joao, 5 U-Pb analysis in titanites and/or monazites of granites and granitoids; 12 geochemical analysis including major, minor and trace elements and ETR, in granites and sills of leucogranites. Finally, the data achieved were integrated with the objective to elaborate an evolutive view of the Complexo Paraiba do Sul 157 refs., 54 figs., 17 tabs.

  6. Experimental Study of Na based Titanium Nanofluid-Water Reaction

    Energy Technology Data Exchange (ETDEWEB)

    Park, Gunyeop; Kim, Soo Jae; Baek, Jehyun; Kim, Hyun Soo; Oh, Sun Ryung; Park, Hyun Sun; Kim, Moo Hwan [POSTECH, Pohang (Korea, Republic of)

    2015-10-15

    In KALIMER-600, a sodium-cooled fast reactor designed by KAERI, thermal energy is transported from high-temperature liquid Na (526 .deg. C at 0.1 MPa) to low temperature water (230 .deg. C at - 19.5 MPa) through a heat exchanger. If any leakage or rupture occurs during the operation of this heat exchanger, highly pressurized liquid water can penetrate into the liquid Na channels; this contact should instantly cause SWR. As reaction continues, liquid water is soon vaporized by pressure drop and huge amount of reaction heat. This generated water vapor expands large reaction area and increases sodium-water vapor reaction process. Therefore, the rapid generation of reaction product (like H{sub 2}) and water vapor increases the system pressure that can cause the system failure in SFR. To reduce this strong chemical reaction phenomena between Na and water, some we have focused on suppressing the chemical reactivity of liquid Na by dispersing nanoparticles (NPs). For the real application of NaTiNF, the pressure change induced by NaTiNF-water reaction is compared with Na-water reaction in the present study. NaTiNF contains 100nm of Ti NPs at 0.2 vol. %. The reaction rate of NaTiNF-water reaction is also investigated as reaction temperature increases. Sodium-water vapor reaction (SVR) will occur when an SWR accident occurs in SFR. In this manner, NaTiNF-water vapor reaction is experimentally performed for ensuring the suppression of chemical reactivity of NaTiNF in contact with water vapor. In the basic step for reducing risk of an SWR in SFR, we have experimentally verified the suppressed chemical reactivity of liquid sodium using Ti NPs through SWR and SVR experiments. In SWR, Na based titanium nanofluid (NaTiNF) shows lower pressure change than Na. As T{sub R} increases, P{sub max} in Na-water reaction increases while NaTiNF does not. The reaction rate of NaTiNF shows twice slower than that of Na. In SVR, NaTiNF shows slower temperature increase than Na. The distinct

  7. Geochemical evidences of the boiling phenomena in Los Humeros geothermal field; Evidencias geoquimicas del fenomeno de ebullicion en el campo de Los Humeros

    Energy Technology Data Exchange (ETDEWEB)

    Munguia Bracamontes, Fernando; Lopez Mendiola, Juan Manuel [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1990-12-31

    The geochemical behavior of the fluids in the geothermal field Los Humeros suggests the existence of a reservoir of relatively low permeability, with hydrostatic pressure gradients and thermodynamic conditions of pressure-temperature close to the boiling point in stationary conditions, that is, non-disturbed. Nevertheless, the fluid geochemistry also indicates the presence of steam under stationary conditions, mainly in the fault, fracture, fissure, etc. zones. The steam diminishes progressively as the extraction time increases, being replaced by boiling fluid. [Espanol] El comportamiento geoquimico de los fluidos en el campo geotermico de Los Humeros sugiere la existencia de un yacimiento de relativa baja permeabilidad, con gradientes de presion hidrostatica y condiciones termodinamicas de presion-temperatura cercanas al punto de ebullicion a condiciones estables; es decir, no perturbadas. Sin embargo, la geoquimica de los fluidos tambien indica la existencia de vapor bajo condiciones estables, principalmente en las zonas de fallas, fracturas, fisuras, etc. El vapor disminuye progresivamente conforme aumenta el tiempo de extraccion, siendo reemplazado por fluido en ebullicion.

  8. Geochemical evidences of the boiling phenomena in Los Humeros geothermal field; Evidencias geoquimicas del fenomeno de ebullicion en el campo de Los Humeros

    Energy Technology Data Exchange (ETDEWEB)

    Munguia Bracamontes, Fernando; Lopez Mendiola, Juan Manuel [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1989-12-31

    The geochemical behavior of the fluids in the geothermal field Los Humeros suggests the existence of a reservoir of relatively low permeability, with hydrostatic pressure gradients and thermodynamic conditions of pressure-temperature close to the boiling point in stationary conditions, that is, non-disturbed. Nevertheless, the fluid geochemistry also indicates the presence of steam under stationary conditions, mainly in the fault, fracture, fissure, etc. zones. The steam diminishes progressively as the extraction time increases, being replaced by boiling fluid. [Espanol] El comportamiento geoquimico de los fluidos en el campo geotermico de Los Humeros sugiere la existencia de un yacimiento de relativa baja permeabilidad, con gradientes de presion hidrostatica y condiciones termodinamicas de presion-temperatura cercanas al punto de ebullicion a condiciones estables; es decir, no perturbadas. Sin embargo, la geoquimica de los fluidos tambien indica la existencia de vapor bajo condiciones estables, principalmente en las zonas de fallas, fracturas, fisuras, etc. El vapor disminuye progresivamente conforme aumenta el tiempo de extraccion, siendo reemplazado por fluido en ebullicion.

  9. Na2SO4-based solid electrolytes for SOx sensors

    DEFF Research Database (Denmark)

    Rao, N.; Schoonman, J.; Toft Sørensen, O.

    1992-01-01

    on the phases present and the structure of the specimens. From a point of view of practical application as SOx sensor material, the Na2SO4 + 5 mol% Y2(SO4)3 + Na2WO4 and Na2SO4+ 4 mol% La2(SO4)3 + Na2WO4 materials are better than undoped Na2SO4 because of their higher conductivity, and absence of a phase...

  10. Collision based spectroscopy of Na- and Mg-like argon

    International Nuclear Information System (INIS)

    Zou, Y.; Wang, M.; Heijkenskoeld, F.; Hutton, R.

    1997-01-01

    In this work, Ne-like Ar 8+ ions in metastable 2p 5 3s 3 P 0.2 levels from an ECR source were passed through a He gas target to populate core excited levels of Na-like Ar 7+ . The resulting spectra were measured and compared with those from Ar 9+ passing the same He target. The population mechanism for core excited 2p 5 3p 2 based on one electron capture by the metastable Ar 8+ levels is discussed. Our results indicate that the two electron-one photon transitions from 2p 5 3s4p is the main populating process. Also, by increasing the length of the gas target, enhancement of the intensity ratio between lines from long lived and short lived levels was observed. (orig.)

  11. NaKnowBaseTM: The EPA Nanomaterials Research ...

    Science.gov (United States)

    The ability to predict the environmental and health implications of engineered nanomaterials is an important research priority due to the exponential rate at which nanotechnology is being incorporated into consumer, industrial and biomedical applications. To address this need and develop predictive capability, we have created the NaKnowbaseTM, which provides a platform for the curation and dissemination of EPA nanomaterials data to support functional assay development, hazard risk models and informatic analyses. To date, we have combined relevant physicochemical parameters from other organizations (e.g., OECD, NIST), with those requested for nanomaterial data submitted to EPA under the Toxic Substances Control Act (TSCA). Physiochemical characterization data were collated from >400 unique nanomaterials including metals, metal oxides, carbon-based and hybrid materials evaluated or synthesized by EPA researchers. We constructed parameter requirements and table structures for encoding research metadata, including experimental factors and measured response variables. As a proof of concept, we illustrate how SQL-based queries facilitate a range of interrogations including, for example, relationships between nanoparticle characteristics and environmental or toxicological endpoints. The views expressed in this poster are those of the authors and may not reflect U.S. EPA policy. The purpose of this submission for clearance is an abstract for submission to a scientific

  12. An Energy Dense-AI-NaBH4-PEMFC Based Power Generator for Unmanned Undersea Vehicles

    Science.gov (United States)

    2016-03-01

    From- To) 03/01/2016 Final 01/28/2013-12/31/2015 4. TITLE AND SUBTITLE Sa. CONTRACT NUMBER An Energy-Dense AI-NaBH4- PEMFC Based Power Generator for...combination of polymer electrolyte membrane fuel cell ( PEMFC ) with a compact hydrogen generator util izing AI-NaBH4 composite fuel. The conditions...ANSI Std. Z39.18 FLORIDA SOLAR ENERGY CENTER. Crl’nrmg EnPrgy lnrll’pendrnr£’ An Energy-Dense Al-NaBH4- PEMFC Based Power Generator for Unmanned

  13. Inactivation of Bacillus cereus by Na-chlorophyllin-based photosensitization on the surface of packaging.

    Science.gov (United States)

    Luksiene, Z; Buchovec, I; Paskeviciute, E

    2010-11-01

    This study was focused on the possibility to inactivate food-borne pathogen Bacillus cereus by Na-chlorophyllin (Na-Chl)-based photosensitization in vitro and after attachment to the surface of packaging material. Bacillus cereus in vitro or attached to the packaging was incubated with Na-Chl (7·5×10(-8) to 7·5×10(-5) mol l(-1) ) for 2-60min in phosphate buffer saline. Photosensitization was performed by illuminating cells under a light with a λ of 400nm and an energy density of 20mW cm(-2) . The illumination time varied 0-5min and subsequently the total energy dose was 0-6J cm(-2) . The results show that B. cereus vegetative cells in vitro or attached to the surface of packaging after incubation with 7·5×10(-7) mol l(-1) Na-Chl and following illumination were inactivated by 7log. The photoinactivation of B. cereus spores in vitro by 4log required higher (7·5×10(-6) mol l(-1) ) Na-Chl concentration. Decontamination of packaging material from attached spores by photosensitization reached 5log at 7·5×10(-5) mol l(-1) Na-Chl concentration. Comparative analysis of different packaging decontamination treatments indicates that washing with water can diminish pathogen population on the surface by packaging material. Spores are more resistant than vegetative cells to photosensitization-based inactivation. Comparison of different surface decontamination treatments indicates that Na-Chl-based photosensitization is much more effective antibacterial tool than washing with water or 200ppm Na-hypochlorite. Our data support the idea that Na-Chl-based photosensitization has great potential for future application as an environment-friendly, nonthermal surface decontamination technique. © 2010 The Authors. Journal of Applied Microbiology © 2010 The Society for Applied Microbiology.

  14. Gas geochemistry of Los Humeros geothermal field, Mexico; Geoquimica de gases del campo geotermico de Los Humeros, Puebla, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Barragan R, Rosa Maria; Arellano G, Victor M; Nieva G, David; Portugal M, Enrique; Garcia G, Alfonso; Aragon A, Alfonso [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico); Torres A, Ignasio S [Centro de Investigacion en Energia, Temixco, Morelos (Mexico); Tovar A, Rigoberto [Comision Federal de Electricidad, Los Humeros, Puebla (Mexico)

    1999-12-01

    Gas data of Los Humeros geothermal field were analyzed. A new method, which is based on the Fischer-Tropch reactions and on the combined pyrite-magnetite mineral equilibrium, was used. Reservoir temperature and reservoir excess steam were estimated for the starting stage of the field by using early data taken from producing wells at controlled conditions. The same parameters were also obtained for the present stage by using 1997 gas data. Reservoir temperatures ranged from 275 and 337 Celsius degrees and positive values for reservoir excess steam fractions were obtained for the starting stage. For well H-1 no excess steam was found since this well was fed by the shallower liquid-dominated reservoir. Results for 1997 showed lower scattering compared to early data and the possible occurrence of a heating process in the shallower stratum which could due to exploitation. [Spanish] En este articulo se presenta un analisis de datos de la fase gaseosa producida por pozos productores del campo geotermico de Los Humeros mediante un metodo que considera el equilibrio de la reaccion de Fischer-Tropsh y el equilibrio de minerales pirita-hematia y pirita-magnetita. Este metodo provee la temperatura del yacimiento y el exceso de vapor presente en la descarga total de los pozos. Los resultados se discuten tanto para el estado inicial del yacimiento utilizando los primeros datos de produccion en los que el flujo del pozo estuvo controlado y los obtenidos en 1997 que representan el estado actual del yacimiento. En el estado inicial se estimaron temperaturas de yacimiento de entre 275 y 337 grados Celsius y excesos de vapor positivos, con excepcion del pozo H-1 que se alimenta del estrato somero dominado por liquido. Los resultados obtenidos para 1997 muestran una dispersion menor y la probable ocurrencia de un proceso de calentamiento del estrato somero propiciado por la explotacion.

  15. Na+/K(+)pump activity in photoreceptors of the blowfly Calliphora : A model analysis based on membrane potential measurements

    NARCIS (Netherlands)

    Gerster, U; Stavenga, DG; Backhaus, W

    Na+/K+-pump activity and intracellular Na+ and K+ concentration changes in blowfly photoreceptors are derived from intracellular potential measurements in vivo with a model based on the Goldman-Hodgkin-Katz theory for membrane currents. The relation between the intracellular Na+ concentration and

  16. Amostragem seqüencial com base na lei de Taylor para levantamento de Spodoptera frugiperda na cultura do milho

    Directory of Open Access Journals (Sweden)

    Farias Paulo Roberto Silva

    2001-01-01

    Full Text Available A lagarta do cartucho do milho é uma das principais pragas do milho nas Américas, podendo ocorrer durante todos os estágios de crescimento da cultura, causando perdas de 15 a 37% na produção. Neste trabalho estudou-se a distribuição espacial dessa praga no campo, com a finalidade de desenvolver um sistema de amostragem para estimar sua densidade populacional. Na área cultivada com milho foram selecionados 3 campos experimentais de 40 m x 250 m cada, divididos em 100 parcelas cada. Foram contados o número de lagartas pequenas e grandes de S. frugiperda nas folhas e no cartucho das plantas, em 10 plantas ao acaso por parcela, num total de 1000 plantas por campo, em 5, 5 e 4 datas de amostragem, respectivamente. Lagartas menores que 1 cm eram consideradas pequenas e lagartas maiores que 1 cm, grandes. Foram estimados os parâmetros da lei de Taylor, sendo as estimativas dos parâmetros das regressões altamente significativas para todas as categorias larvais. O parâmetro b da lei de Taylor para lagarta pequena foi igual a 1,57, indicando que a forma de distribuição dessa categoria larval é agregada. Para lagartas grandes o parâmetro b foi igual a 0,79, o que conduz a um tipo de distribuição tendendo para aleatoriedade. Para o número total de lagartas os resultados são equivalentes aos obtidos para lagartas pequenas. Foi desenvolvido um plano de amostragem seqüencial com base nos parâmetros da lei de Taylor.

  17. Na-ion batteries based on the inorganic BN nanocluster anodes: DFT studies.

    Science.gov (United States)

    Nejati, K; Hosseinian, A; Bekhradnia, A; Vessally, E; Edjlali, L

    2017-06-01

    It has been recently indicated that the Li-ion batteries may be replaced by Na-ion batteries because of their low safety, high cost, and low-temperature performance, and lack of the Li mineral reserves. Here, using density functional theory calculations, we studied the potential application of B 12 N 12 nanoclusters as anode in Na-ion batteries. Our calculations indicate that the adsorption energy of Na + and Na are about -23.4 and -1.4kcal/mol, respectively, and the pristine BN cage to improve suffers from a low cell voltage (∼0.92V) as an anode in Na-ion batteries. We presented a strategy to increase the cell voltage and performance of Na-ion batteries. We showed that encapsulation of different halides (X=F - , Cl - , or Br - ) into BN cage significantly increases the cell voltage. By increasing the atomic number of X, the Gibbs free energy change of cell becomes more negative and the cell voltage is increased up to 3.93V. The results are discussed based on the structural, energetic, frontier molecular orbital, charge transfer and electronic properties and compared with the performance of other nanostructured anodes. Copyright © 2017 Elsevier Inc. All rights reserved.

  18. A fast Na+/Ca2+-based action potential in a marine diatom.

    Directory of Open Access Journals (Sweden)

    Alison R Taylor

    Full Text Available BACKGROUND: Electrical impulses in animals play essential roles in co-ordinating an array of physiological functions including movement, secretion, environmental sensing and development. Underpinning many of these electrical signals is a fast Na+-based action potential that has been fully characterised only in cells associated with the neuromuscular systems of multicellular animals. Such rapid action potentials are thought to have evolved with the first metazoans, with cnidarians being the earliest representatives. The present study demonstrates that a unicellular protist, the marine diatom Odontella sinensis, can also generate a fast Na+/Ca2+ based action potential that has remarkably similar biophysical and pharmacological properties to invertebrates and vertebrate cardiac and skeletal muscle cells. METHODOLOGY/PRINCIPAL FINDINGS: The kinetic, ionic and pharmacological properties of the rapid diatom action potential were examined using single electrode current and voltage clamp techniques. Overall, the characteristics of the fast diatom currents most closely resemble those of vertebrate and invertebrate muscle Na+/Ca2+ currents. CONCLUSIONS/SIGNIFICANCE: This is the first demonstration of voltage-activated Na+ channels and the capacity to generate fast Na+-based action potentials in a unicellular photosynthetic organism. The biophysical and pharmacological characteristics together with the presence of a voltage activated Na+/Ca2+ channel homologue in the recently sequenced genome of the diatom Thalassiosira pseudonana, provides direct evidence supporting the hypothesis that this rapid signalling mechanism arose in ancestral unicellular eukaryotes and has been retained in at least two phylogenetically distant lineages of eukaryotes; opisthokonts and the stramenopiles. The functional role of the fast animal-like action potential in diatoms remains to be elucidated but is likely involved in rapid environmental sensing of these widespread and

  19. Microbial control of food-related surfaces: Na-Chlorophyllin-based photosensitization.

    Science.gov (United States)

    Luksiene, Zivile; Paskeviciute, Egle

    2011-10-05

    The aim of this study was to evaluate efficiency of photosensitization as surface sanitation alternative using model systems when food pathogens, their spores and biofilms were attached to the food-related surface (polyolefine). In addition it was important to compare antibacterial efficiency of Na-Chlorophyllin (Na-Chl)-based photosensitization with conventional sanitizers. Obtained results indicate that Bacilluscereus ATCC 12826 and Listeriamonocytogenes ATCC 7644 as well as their thermoresistant strains B.cereus SV90 and L.monocytogenes 56LY were effectively inactivated (7 log) by Na-Chl-based photosensitization in vitro. Inactivation rate of thermoresistant strains was slower. The number of attached to the surface B.cereus ATCC 12826 and L.monocytogenes ATCC 7644 was reduced from 4-4.5 log to 0 log after photosensitization treatment. To achieve adequate inactivation of thermoresistant strains the higher Na-Chl concentration and longer illumination times had to be used. Comparison of different surface decontamination treatments reveal that photosensitization is much more effective against all surface-attached B.cereus and L.monocytogenes strains than washing with water or 200 ppm Na-hypochlorite. It is important to note, that surface-attached B.cereus spores and L.monocytogenes biofilms can be eliminated from it by photosensitization as well. Our data support the idea that Na-Chlorophyllin-based photosensitization has high antibacterial potential which may serve in the future for the development of human and environment friendly, non-thermal surface decontamination technique. Copyright © 2011 Elsevier B.V. All rights reserved.

  20. Estudo bibliométrico do descritor “Ergonomia” na base LISA

    Directory of Open Access Journals (Sweden)

    Eliana Maria dos Santos Bahia

    2011-03-01

    Full Text Available Objetivo: O estudo analisa a produção científica sobre ergonomia utilizando a base de dados Library and Information Science Abstracts (LISA. A base de dados LISA, iniciada em 1969, mantém sua cobertura temática na área de Biblioteconomia e Ciência da Informação.Método: No estudo utilizou-se o método da bibliometria aplicada para verificar a produção científica indexada.Resultados: Entre os resultados da busca de termos indexados na base de dados LISA, encontraram-se 503 artigos com o termo “Ergonomic”; 352 artigos, com a expressão “Design”; 111 artigos com o descritor “Systems”; 110 artigos com o termo “Work”; e , 98 artigos com o termo “Evaluation”. Dentre os 34 títulos de periódicos, 4 títulos cobrem 79% dos artigos que tratam sobre Ergonomia na base LISA. Os demais 30 títulos de periódicos cobrem 21% dos artigos indexados sob essa temática.Conclusões: O presente estudo bibliométrico oferece possibilita um panorama de como a ergonomia é percebida na área da Biblioteconomia e Ciência da Informação.

  1. Understanding the conductive channel evolution in Na:WO3-x-based planar devices

    Science.gov (United States)

    Shang, Dashan; Li, Peining; Wang, Tao; Carria, Egidio; Sun, Jirong; Shen, Baogen; Taubner, Thomas; Valov, Ilia; Waser, Rainer; Wuttig, Matthias

    2015-03-01

    An ion migration process in a solid electrolyte is important for ion-based functional devices, such as fuel cells, batteries, electrochromics, gas sensors, and resistive switching systems. In this study, a planar sandwich structure is prepared by depositing tungsten oxide (WO3-x) films on a soda-lime glass substrate, from which Na+ diffuses into the WO3-x films during the deposition. The entire process of Na+ migration driven by an alternating electric field is visualized in the Na-doped WO3-x films in the form of conductive channel by in situ optical imaging combined with infrared spectroscopy and near-field imaging techniques. A reversible change of geometry between a parabolic and a bar channel is observed with the resistance change of the devices. The peculiar channel evolution is interpreted by a thermal-stress-induced mechanical deformation of the films and an asymmetric Na+ mobility between the parabolic and the bar channels. These results exemplify a typical ion migration process driven by an alternating electric field in a solid electrolyte with a low ion mobility and are expected to be beneficial to improve the controllability of the ion migration in ion-based functional devices, such as resistive switching devices.An ion migration process in a solid electrolyte is important for ion-based functional devices, such as fuel cells, batteries, electrochromics, gas sensors, and resistive switching systems. In this study, a planar sandwich structure is prepared by depositing tungsten oxide (WO3-x) films on a soda-lime glass substrate, from which Na+ diffuses into the WO3-x films during the deposition. The entire process of Na+ migration driven by an alternating electric field is visualized in the Na-doped WO3-x films in the form of conductive channel by in situ optical imaging combined with infrared spectroscopy and near-field imaging techniques. A reversible change of geometry between a parabolic and a bar channel is observed with the resistance change of the

  2. Understanding the conductive channel evolution in Na:WO(3-x)-based planar devices.

    Science.gov (United States)

    Shang, Dashan; Li, Peining; Wang, Tao; Carria, Egidio; Sun, Jirong; Shen, Baogen; Taubner, Thomas; Valov, Ilia; Waser, Rainer; Wuttig, Matthias

    2015-04-14

    An ion migration process in a solid electrolyte is important for ion-based functional devices, such as fuel cells, batteries, electrochromics, gas sensors, and resistive switching systems. In this study, a planar sandwich structure is prepared by depositing tungsten oxide (WO(3-x)) films on a soda-lime glass substrate, from which Na(+) diffuses into the WO(3-x) films during the deposition. The entire process of Na(+) migration driven by an alternating electric field is visualized in the Na-doped WO(3-x) films in the form of conductive channel by in situ optical imaging combined with infrared spectroscopy and near-field imaging techniques. A reversible change of geometry between a parabolic and a bar channel is observed with the resistance change of the devices. The peculiar channel evolution is interpreted by a thermal-stress-induced mechanical deformation of the films and an asymmetric Na(+) mobility between the parabolic and the bar channels. These results exemplify a typical ion migration process driven by an alternating electric field in a solid electrolyte with a low ion mobility and are expected to be beneficial to improve the controllability of the ion migration in ion-based functional devices, such as resistive switching devices.

  3. NaNet-10: a 10GbE network interface card for the GPU-based low-level trigger of the NA62 RICH detector

    International Nuclear Information System (INIS)

    Ammendola, R.; Biagioni, A.; Frezza, O.; Lonardo, A.; Cicero, F. Lo; Martinelli, M.; Paolucci, P.S.; Pastorelli, E.; Simula, F.; Tosoratto, L.; Vicini, P.; Fiorini, M.; Neri, I.; Lamanna, G.; Piandani, R.; Pontisso, L.; Sozzi, M.; Rossetti, D.

    2016-01-01

    A GPU-based low level (L0) trigger is currently integrated in the experimental setup of the RICH detector of the NA62 experiment to assess the feasibility of building more refined physics-related trigger primitives and thus improve the trigger discriminating power. To ensure the real-time operation of the system, a dedicated data transport mechanism has been implemented: an FPGA-based Network Interface Card (NaNet-10) receives data from detectors and forwards them with low, predictable latency to the memory of the GPU performing the trigger algorithms. Results of the ring-shaped hit patterns reconstruction will be reported and discussed

  4. High Density Hydrogen Storage System Demonstration Using NaAlH4 Based Complex Compound Hydrides

    Energy Technology Data Exchange (ETDEWEB)

    Daniel A. Mosher; Xia Tang; Ronald J. Brown; Sarah Arsenault; Salvatore Saitta; Bruce L. Laube; Robert H. Dold; Donald L. Anton

    2007-07-27

    This final report describes the motivations, activities and results of the hydrogen storage independent project "High Density Hydrogen Storage System Demonstration Using NaAlH4 Based Complex Compound Hydrides" performed by the United Technologies Research Center under the Department of Energy Hydrogen Program, contract # DE-FC36-02AL67610. The objectives of the project were to identify and address the key systems technologies associated with applying complex hydride materials, particularly ones which differ from those for conventional metal hydride based storage. This involved the design, fabrication and testing of two prototype systems based on the hydrogen storage material NaAlH4. Safety testing, catalysis studies, heat exchanger optimization, reaction kinetics modeling, thermochemical finite element analysis, powder densification development and material neutralization were elements included in the effort.

  5. Utilização de subprodutos de origem animal em dietas formuladas com base em proteína bruta e proteína ideal para frangos de corte de 1 a 21 dias de idade

    OpenAIRE

    Cancherini,Luciana Cardoso; Junqueira,Otto Mack; Oliveira,Maria Cristina de; Andreotti,Marcelo de Oliveira; Barbosa,Maria José Baptista

    2005-01-01

    Foi conduzido um experimento para avaliar a utilização de subprodutos de origem animal em dietas para frangos de corte, formuladas com base na proteína bruta ou proteína ideal. O delineamento foi inteiramente casualizado em esquema fatorial 2x2+1, com duas fontes de proteína de origem animal (farinha de vísceras de aves e farinha de sangue bovino), dois conceitos de formulação (proteína bruta e proteína ideal) e uma dieta testemunha à base de milho e farelo de soja, com quatro repetições. As ...

  6. Surface Plasmon Resonance Biosensor Method for Palytoxin Detection Based on Na+,K+-ATPase Affinity

    Science.gov (United States)

    Alfonso, Amparo; Pazos, María-José; Fernández-Araujo, Andrea; Tobio, Araceli; Alfonso, Carmen; Vieytes, Mercedes R.; Botana, Luis M.

    2013-01-01

    Palytoxin (PLTX), produced by dinoflagellates from the genus Ostreopsis was first discovered, isolated, and purified from zoanthids belonging to the genus Palythoa. The detection of this toxin in contaminated shellfish is essential for human health preservation. A broad range of studies indicate that mammalian Na+,K+-ATPase is a high affinity cellular receptor for PLTX. The toxin converts the pump into an open channel that stimulates sodium influx and potassium efflux. In this work we develop a detection method for PLTX based on its binding to the Na+,K+-ATPase. The method was developed by using the phenomenon of surface plasmon resonance (SPR) to monitor biomolecular reactions. This technique does not require any labeling of components. The interaction of PLTX over immobilized Na+,K+-ATPase is quantified by injecting different concentrations of toxin in the biosensor and checking the binding rate constant (kobs). From the representation of kobs versus PLTX concentration, the kinetic equilibrium dissociation constant (KD) for the PLTX-Na+,K+-ATPase association can be calculated. The value of this constant is KD = 6.38 × 10−7 ± 6.67 × 10−8 M PLTX. In this way the PLTX-Na+,K+-ATPase association was used as a suitable method for determination of the toxin concentration in a sample. This method represents a new and useful approach to easily detect the presence of PLTX-like compounds in marine products using the mechanism of action of these toxins and in this way reduce the use of other more expensive and animal based methods. PMID:24379088

  7. Surface plasmon resonance biosensor method for palytoxin detection based on Na+,K+-ATPase affinity.

    Science.gov (United States)

    Alfonso, Amparo; Pazos, María-José; Fernández-Araujo, Andrea; Tobio, Araceli; Alfonso, Carmen; Vieytes, Mercedes R; Botana, Luis M

    2013-12-27

    Palytoxin (PLTX), produced by dinoflagellates from the genus Ostreopsis was first discovered, isolated, and purified from zoanthids belonging to the genus Palythoa. The detection of this toxin in contaminated shellfish is essential for human health preservation. A broad range of studies indicate that mammalian Na+,K+-ATPase is a high affinity cellular receptor for PLTX. The toxin converts the pump into an open channel that stimulates sodium influx and potassium efflux. In this work we develop a detection method for PLTX based on its binding to the Na+,K+-ATPase. The method was developed by using the phenomenon of surface plasmon resonance (SPR) to monitor biomolecular reactions. This technique does not require any labeling of components. The interaction of PLTX over immobilized Na+,K+-ATPase is quantified by injecting different concentrations of toxin in the biosensor and checking the binding rate constant (Kobs). From the representation of Kobs versus PLTX concentration, the kinetic equilibrium dissociation constant (K(D)) for the PLTX-Na+,K+-ATPase association can be calculated. The value of this constant is K(D) = 6.38 × 10-7 ± 6.67 × 10-8 M PLTX. In this way the PLTX-Na+,K+-ATPase association was used as a suitable method for determination of the toxin concentration in a sample. This method represents a new and useful approach to easily detect the presence of PLTX-like compounds in marine products using the mechanism of action of these toxins and in this way reduce the use of other more expensive and animal based methods.

  8. Surface Plasmon Resonance Biosensor Method for Palytoxin Detection Based on Na+,K+-ATPase Affinity

    Directory of Open Access Journals (Sweden)

    Amparo Alfonso

    2013-12-01

    Full Text Available Palytoxin (PLTX, produced by dinoflagellates from the genus Ostreopsis was first discovered, isolated, and purified from zoanthids belonging to the genus Palythoa. The detection of this toxin in contaminated shellfish is essential for human health preservation. A broad range of studies indicate that mammalian Na+,K+-ATPase is a high affinity cellular receptor for PLTX. The toxin converts the pump into an open channel that stimulates sodium influx and potassium efflux. In this work we develop a detection method for PLTX based on its binding to the Na+,K+-ATPase. The method was developed by using the phenomenon of surface plasmon resonance (SPR to monitor biomolecular reactions. This technique does not require any labeling of components. The interaction of PLTX over immobilized Na+,K+-ATPase is quantified by injecting different concentrations of toxin in the biosensor and checking the binding rate constant (kobs. From the representation of kobs versus PLTX concentration, the kinetic equilibrium dissociation constant (KD for the PLTX-Na+,K+-ATPase association can be calculated. The value of this constant is KD = 6.38 × 10−7 ± 6.67 × 10−8 M PLTX. In this way the PLTX-Na+,K+-ATPase association was used as a suitable method for determination of the toxin concentration in a sample. This method represents a new and useful approach to easily detect the presence of PLTX-like compounds in marine products using the mechanism of action of these toxins and in this way reduce the use of other more expensive and animal based methods.

  9. A first-principles study of hydrogen storage capacity based on Li-Na-decorated silicene.

    Science.gov (United States)

    Sheng, Zhe; Wu, Shujing; Dai, Xianying; Zhao, Tianlong; Hao, Yue

    2018-05-23

    Surface decoration with alkali metal adatoms has been predicted to be promising for silicene to obtain high hydrogen storage capacity. Herein, we performed a detailed study of the hydrogen storage properties of Li and Na co-decorated silicene (Li-Na-decorated silicene) based on first-principles calculations using van der Waals correction. The hydrogen adsorption behaviors, including the adsorption order, the maximum capacity, and the corresponding mechanism were analyzed in detail. Our calculations show that up to three hydrogen molecules can firmly bind to each Li atom and six for each Na atom, respectively. The hydrogen storage capacity is estimated to be as high as 6.65 wt% with a desirable average adsorption energy of 0.29 eV/H2. It is confirmed that both the charge-induced electrostatic interaction and the orbital hybridizations play a great role in hydrogen storage. Our results may enhance our fundamental understanding of the hydrogen storage mechanism, which is of great importance for the practical application of Li-Na-decorated silicene in hydrogen storage.

  10. Temperature effect on the acid-base behaviour of Na-montmorillonite.

    Science.gov (United States)

    Duc, Myriam; Carteret, Cédric; Thomas, Fabien; Gaboriaud, Fabien

    2008-11-15

    We report a study of the acid-base properties of Na-montmorillonite suspensions at temperatures from 25 degrees C to 80 degrees C, by continuous and batch potentiometric methods, combined with analysis of the dissolved and readsorbed species. The batch titration curves reveal that the dissolution processes of Na-montmorillonite and silica-rich secondary phases are increasingly predominant, respectively at acid and basic pH, and according to the temperature. The continuous titration curves are less affected by these side reactions. In the absence of a common intersection point, the thermodynamic analysis of the curves was based on the shift of the PZNPC with the ionic strength. This shift was not significantly altered by the temperature, by comparison with the dissociation product of water in the same conditions. Therefore we concluded that protonation-deprotonation of the dissociable sites at the edges of the clay platelets is not significantly temperature dependent.

  11. Tricalcium phosphate based resorbable ceramics: Influence of NaF and CaO addition

    Energy Technology Data Exchange (ETDEWEB)

    Seeley, Zachary; Bandyopadhyay, Amit [W. M. Keck Biomedical Materials Research Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164 (United States); Bose, Susmita [W. M. Keck Biomedical Materials Research Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164 (United States)], E-mail: sbose@wsu.edu

    2008-01-10

    Resorbable bioceramics have gained much attention due to their time-varying mechanical properties in-vivo. Implanted ceramics degrade allowing bone in-growth and eventual replacement of the artificial material with natural tissue. Calcium phosphate based materials have caught the most significant attention because of their excellent biocompatibility and compositional similarities to natural bone. Doping these ceramics with various metal ions has significantly influenced their properties. In this study, tricalcium phosphate (TCP) compacts were fabricated via uniaxial compression with five compositions: (i) pure TCP, (ii) TCP with 2.0 wt.% NaF, (iii) TCP with 3.0 wt.% CaO, (iv) TCP with a binary of 2.0 wt.% NaF and 0.5 wt.% Ag{sub 2}O, and (v) TCP with a quaternary of 1.0 wt.% TiO{sub 2}, 0.5 wt.% Ag{sub 2}O, 2.0 wt.% NaF, and 3.0 wt.% CaO. These compacts were sintered at 1250 deg. C for 4 h to obtain dense ceramic structures. Phase analyses were carried out using X-ray diffraction. The presence of NaF in TCP improved densification and increased compression strength from 70 ({+-} 25) to 130 ({+-} 40) MPa. Addition of CaO had no influence on density or strength. Human osteoblast cell growth behavior was studied using an osteoprecursor cell line (OPC 1) to assure that the biocompatibility of these ceramics was not altered due to the dopants. For long-term biodegradation studies, density, weight change, surface microstructure, and uniaxial compression strength were measured as a function of time in a simulated body fluid (SBF). Weight gain in SBF correlated strongly with precipitation viewed in the inter-connected pores of the samples. After 3 months in SBF, all samples displayed a reduction in strength. NaF, CaO and the quaternary compositions maintained the most steady strength loss under SBF.

  12. WEB based user's applications for NA61/SHINE experiment at CERN

    CERN Document Server

    Piwek, Mateusz

    1. Introduction The Master Thesis titled „Web based users applications for NA61/SHINE experiment at CERN” presents the World Wide Web technologies that has been used during development of the software suite for NA61/SHINE experiment. Presented software was implemented and is use by a group of approximately sixty users 1 . The NA61/SHINE is one of many projects that takes place in the European Organization for Nuclear Research – CERN located near Geneva. 1.1. About CERN CERN (French: Organisation européenne pour la recherche nucléaire 2 ) was established on 29 th of September 1954. Poland is a member state since 1991, however a for a long time before joining CERN Poland as the only country of Communist Block had an observatory status. Nowadays Polish scientists are taking a part in a main CERN's experiments such as ALICE, ATLAS or CMS. CERN's essential scientific facilities are the particle physics accelerators and detectors. The beam provided by the accelerator or collider by interacting w...

  13. Identification of Rice Accessions Associated with K+/Na+ Ratio and Salt Tolerance Based on Physiological and Molecular Responses

    Directory of Open Access Journals (Sweden)

    Inja Naga Bheema Lingeswara Reddy

    2017-11-01

    Full Text Available The key for rice plant survival under NaCl salt stress is maintaining a high K+/Na+ ratio in its cells. Selection for salt tolerance rice genotypes based on phenotypic performance alone will delay in progress in breeding. Use of molecular markers in tandem with physiological studies will help in better identification of salt tolerant rice accessions. Eight rice accessions along with the check Dongjin were screened using 1/2 Yoshida solution with 50 mmol/L NaCl at the seedling stage. The accessions IT001158, IT246674, IT260533 and IT291341 were classified as salt tolerant based on their K+/Na+ ratios. Seventeen SSR markers reported to be associated with K+/Na+ ratio were used to screen the accessions. Five SSR markers (RM8053, RM345, RM318, RM253 and RM7075 could differentiate accessions classified based on their K+/Na+ ratios. Banding pattern of the accessions was scored compared to the banding pattern of Dongjin. The study differentiated accessions based on their association of K+/Na+ ratio with molecular markers which are very reliable. These markers can play a significant role in screening large set of rice germplasms for salt tolerance and also help in identification of high-yielding varieties with better salt tolerance. The salt tolerant accessions can be taken forward into developing better varieties by conventional breeding and exploring genes for salt tolerance.

  14. A Sensor Based on LiCl/NaA Zeolite Composites for Effective Humidity Sensing.

    Science.gov (United States)

    Zhang, Ying; Xiang, Hongyu; Sun, Liang; Xie, Qiuhong; Liu, Man; Chen, Yu; Ruan, Shengping

    2018-03-01

    LiCl/NaA zeolite composites were successfully prepared by doping 1 wt%, 2 wt%, 5 wt%, and 8 wt% of LiCl into NaA zeolite. The humidity sensing properties of LiCl/NaA composites were investigated among 11% 95% relative humidity (RH). The LiCl/NaA composites exhibited better humidity sensing properties than pure NaA zeolite. The sensor made by 2 wt% Li-doped NaA zeolite possesses the best linearly in the whole RH. These results demonstrate that the LiCl/NaA composites have the potential application in humidity sensing.

  15. A new automated NaCl based robust method for routine production of gallium-68 labeled peptides

    International Nuclear Information System (INIS)

    Schultz, Michael K.; Mueller, Dirk; Baum, Richard P.; Leonard Watkins, G.; Breeman, Wouter A.P.

    2013-01-01

    A new NaCl based method for preparation of gallium-68 labeled radiopharmaceuticals has been adapted for use with an automated gallium-68 generator system. The method was evaluated based on 56 preparations of [ 68 Ga]DOTATOC and compared to a similar acetone-based approach. Advantages of the new NaCl approach include reduced preparation time ( 97%), and specific activity (>40 MBq nmole −1 [ 68 Ga]DOTATOC) and is well-suited for clinical production of radiopharmaceuticals. - Highlights: ► A NaCl based automated production of Ga-68-radiopharmaceuticals is described. ► Using 5 M NaCl for pre-purification of 68Ga eliminates the need for organic solvents. ► The method provides for high efficiency, specific activity, and radiochemical purity. ► The new method eliminates the need for the quality control by gas chromatography

  16. Search for lost or orphan radioactive sources based on NaI gamma spectrometry

    International Nuclear Information System (INIS)

    Aage, H.K.; Korsbech, U.

    2003-01-01

    Within recent decades many radioactive sources have been lost, stolen, or abandoned, and some have caused contamination or irradiation of people. Therefore reliable methods for source recovery are needed. The use of car borne NaI(Tl) detectors is discussed. Standard processing of spectra in general can disclose strong and medium level signals from manmade nuclides. But methods for detecting low level signals from weak, distant or shielded sources can be improved. New methods for source detection and identification based on noise adjusted singular value decomposition and on area specific stripping of spectra are presented

  17. Quantitative spectrographic analysis of Li, Na and Ca in uranium base materials, using the carrier distillation technique

    International Nuclear Information System (INIS)

    Gomes, R.P.; Brito, J. de.

    1978-01-01

    A spectrographic method for the quantitative determination of Ca, Li and Na in uranium base materials is described. The carrier destillation technique is used and a study is made for the selection of best carrier compounds. In U 3 O 8 matrix, the best results are obtained with 4% In 2 O 3 for the determination of Na and a 15% mixed carrier (3 NaCl + 1 Y 2 O 3 ) for the determination of Ca and Li. The minium determination limit for Ca and Li is 1 ppm while for Na it is 15 ppm. The precision of the method is calculated and the relative standard deviation is found to be 11, 16 and 6,5% for Ca, Li and Na respectively [pt

  18. NaNet: a flexible and configurable low-latency NIC for real-time trigger systems based on GPUs

    International Nuclear Information System (INIS)

    Ammendola, R; Biagioni, A; Frezza, O; Lonardo, A; Cicero, F Lo; Paolucci, P S; Rossetti, D; Simula, F; Tosoratto, L; Vicini, P; Lamanna, G; Pantaleo, F; Sozzi, M

    2014-01-01

    NaNet is an FPGA-based PCIe X8 Gen2 NIC supporting 1/10 GbE links and the custom 34 Gbps APElink channel. The design has GPUDirect RDMA capabilities and features a network stack protocol offloading module, making it suitable for building low-latency, real-time GPU-based computing systems. We provide a detailed description of the NaNet hardware modular architecture. Benchmarks for latency and bandwidth for GbE and APElink channels are presented, followed by a performance analysis on the case study of the GPU-based low level trigger for the RICH detector in the NA62 CERN experiment, using either the NaNet GbE and APElink channels. Finally, we give an outline of project future activities

  19. NaNet: a flexible and configurable low-latency NIC for real-time trigger systems based on GPUs

    CERN Document Server

    INSPIRE-00646837; Biagioni, A.; Frezza, O.; Lamanna, G.; Lonardo, A.; Lo Cicero, F.; Paolucci, P.S.; Pantaleo, F.; Rossetti, D.; Simula, F.; Sozzi, M.; Tosoratto, L.; Vicini, P.

    2014-02-21

    NaNet is an FPGA-based PCIe X8 Gen2 NIC supporting 1/10 GbE links and the custom 34~Gbps APElink channel. The design has GPUDirect RDMA capabilities and features a network stack protocol offloading module, making it suitable for building low-latency, real-time GPU-based computing systems. We provide a detailed description of the NaNet hardware modular architecture. Benchmarks for latency and bandwidth for GbE and APElink channels are presented, followed by a performance analysis on the case study of the GPU-based low level trigger for the RICH detector in the NA62 CERN experiment, using either the NaNet GbE and APElink channels. Finally, we give an outline of project future activities.

  20. NaNet: a flexible and configurable low-latency NIC for real-time trigger systems based on GPUs

    Energy Technology Data Exchange (ETDEWEB)

    Ammendola, R [INFN Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 1 - 00133 Roma (Italy); Biagioni, A; Frezza, O; Lonardo, A; Cicero, F Lo; Paolucci, P S; Rossetti, D; Simula, F; Tosoratto, L; Vicini, P [INFN Sezione di Roma, P.le Aldo Moro, 2 - 00185 Roma (Italy); Lamanna, G; Pantaleo, F; Sozzi, M [INFN Sezione di Pisa, Via F. Buonarroti 2 - 56127 Pisa (Italy)

    2014-02-01

    NaNet is an FPGA-based PCIe X8 Gen2 NIC supporting 1/10 GbE links and the custom 34 Gbps APElink channel. The design has GPUDirect RDMA capabilities and features a network stack protocol offloading module, making it suitable for building low-latency, real-time GPU-based computing systems. We provide a detailed description of the NaNet hardware modular architecture. Benchmarks for latency and bandwidth for GbE and APElink channels are presented, followed by a performance analysis on the case study of the GPU-based low level trigger for the RICH detector in the NA62 CERN experiment, using either the NaNet GbE and APElink channels. Finally, we give an outline of project future activities.

  1. Understanding the Effect of Na in Improving the Performance of CuInSe2 Based Photovoltaics

    Energy Technology Data Exchange (ETDEWEB)

    Dobson, Kevin D. [Univ. of Delaware, Newark, DE (United States)

    2015-11-17

    Cu(In,Ga)Se2 (CIGS) thin film photovoltaic technology is in the early stages of commercialization with an annual manufacturing capacity over 1 GW and has demonstrated the highest module efficiency of any of the thin film technologies. However there still is a lack of fundamental understanding of the relationship between the material properties and solar cell device operation. It is well known that the incorporation of a small amount of Na into the CIGS film during processing is essential for high efficiency devices. However, there are conflicting explanations for how Na behaves at the atomic scale. This report investigates how Na is incorporated into the CIGS device structure and evaluates the diffusion of Na into CIGS grain boundaries (GBs) and bulk crystallites. Participants: This project was carried out at the Institute of Energy Conversion at the University of Delaware, collaborating with the Rockett group at the University of Illinois Urbana-Champagne. Significant Findings: The significant outcomes of this project for each task include; Task 1.0: Effect of Na in Devices Fabricated on PVD Deposited CIGS; Na diffusion occurs through the Mo back contact via GBs driven by the presence of oxygen; Na reversibly compensates donor defects in CIGS GBs,Task 2.0: Na Incorporation in Single Crystal CIGS; and bulk Na diffusion proceeds rapidly such that grains are Na-saturated immediately following CIGS thin film manufacture. Industry Guidance: The presented results offer interesting concepts for modification of manufacturing processes of CIGS-based PV modules. Possible approaches to improve control of Na uptake and uniformly increase levels in CIGS films are highlighted for processes that employ either soda-lime glass or NaF as the Na source. Concepts include the potential of O2 or oxidative based treatments of Mo back contacts to improve Na diffusion through the metal film and increase Na uptake into the growing CIGS. This project has also offered

  2. Aspect-based sentiment analysis to review products using Naïve Bayes

    Science.gov (United States)

    Mubarok, Mohamad Syahrul; Adiwijaya, Aldhi, Muhammad Dwi

    2017-08-01

    Product reviews can provide great benefits for consumers and producers. Number of reviews could be ranging from hundreds to thousands and containing various opinions. These make the process of analyzing and extracting information on existing reviews become increasingly difficult. In this research, sentiment analysis was used to analyze and extract sentiment polarity on product reviews based on a specific aspect of the product. This research was conducted in three phases, such as data preprocessing which involves part-of-speech (POS) tagging, feature selection using Chi Square, and classification of sentiment polarity of aspects using Naïve Bayes. Based on evaluation results, it is known that the system is able to perform aspect-based sentiment analysis with its highest F1-Measure of 78.12%.

  3. NaNet: a low-latency NIC enabling GPU-based, real-time low level trigger systems

    International Nuclear Information System (INIS)

    Ammendola, Roberto; Biagioni, Andrea; Frezza, Ottorino; Cicero, Francesca Lo; Lonardo, Alessandro; Paolucci, Pier Stanislao; Rossetti, Davide; Simula, Francesco; Tosoratto, Laura; Vicini, Piero; Fantechi, Riccardo; Lamanna, Gianluca; Pantaleo, Felice; Piandani, Roberto; Sozzi, Marco; Pontisso, Luca

    2014-01-01

    We implemented the NaNet FPGA-based PCIe Gen2 GbE/APElink NIC, featuring GPUDirect RDMA capabilities and UDP protocol management offloading. NaNet is able to receive a UDP input data stream from its GbE interface and redirect it, without any intermediate buffering or CPU intervention, to the memory of a Fermi/Kepler GPU hosted on the same PCIe bus, provided that the two devices share the same upstream root complex. Synthetic benchmarks for latency and bandwidth are presented. We describe how NaNet can be employed in the prototype of the GPU-based RICH low-level trigger processor of the NA62 CERN experiment, to implement the data link between the TEL62 readout boards and the low level trigger processor. Results for the throughput and latency of the integrated system are presented and discussed.

  4. NaNet: a low-latency NIC enabling GPU-based, real-time low level trigger systems

    Energy Technology Data Exchange (ETDEWEB)

    Ammendola, Roberto [INFN, Rome – Tor Vergata (Italy); Biagioni, Andrea; Frezza, Ottorino; Cicero, Francesca Lo; Lonardo, Alessandro; Paolucci, Pier Stanislao; Rossetti, Davide; Simula, Francesco; Tosoratto, Laura; Vicini, Piero [INFN, Rome – Sapienza (Italy); Fantechi, Riccardo [CERN, Geneve (Switzerland); Lamanna, Gianluca; Pantaleo, Felice; Piandani, Roberto; Sozzi, Marco [INFN, Pisa (Italy); Pontisso, Luca [University, Rome (Italy)

    2014-06-11

    We implemented the NaNet FPGA-based PCIe Gen2 GbE/APElink NIC, featuring GPUDirect RDMA capabilities and UDP protocol management offloading. NaNet is able to receive a UDP input data stream from its GbE interface and redirect it, without any intermediate buffering or CPU intervention, to the memory of a Fermi/Kepler GPU hosted on the same PCIe bus, provided that the two devices share the same upstream root complex. Synthetic benchmarks for latency and bandwidth are presented. We describe how NaNet can be employed in the prototype of the GPU-based RICH low-level trigger processor of the NA62 CERN experiment, to implement the data link between the TEL62 readout boards and the low level trigger processor. Results for the throughput and latency of the integrated system are presented and discussed.

  5. NaNet:a low-latency NIC enabling GPU-based, real-time low level trigger systems

    CERN Document Server

    INSPIRE-00646837; Biagioni, Andrea; Fantechi, Riccardo; Frezza, Ottorino; Lamanna, Gianluca; Lo Cicero, Francesca; Lonardo, Alessandro; Paolucci, Pier Stanislao; Pantaleo, Felice; Piandani, Roberto; Pontisso, Luca; Rossetti, Davide; Simula, Francesco; Sozzi, Marco; Tosoratto, Laura; Vicini, Piero

    2014-01-01

    We implemented the NaNet FPGA-based PCI2 Gen2 GbE/APElink NIC, featuring GPUDirect RDMA capabilities and UDP protocol management offloading. NaNet is able to receive a UDP input data stream from its GbE interface and redirect it, without any intermediate buffering or CPU intervention, to the memory of a Fermi/Kepler GPU hosted on the same PCIe bus, provided that the two devices share the same upstream root complex. Synthetic benchmarks for latency and bandwidth are presented. We describe how NaNet can be employed in the prototype of the GPU-based RICH low-level trigger processor of the NA62 CERN experiment, to implement the data link between the TEL62 readout boards and the low level trigger processor. Results for the throughput and latency of the integrated system are presented and discussed.

  6. A new automated NaCl based robust method for routine production of gallium-68 labeled peptides

    Science.gov (United States)

    Schultz, Michael K.; Mueller, Dirk; Baum, Richard P.; Watkins, G. Leonard; Breeman, Wouter A. P.

    2017-01-01

    A new NaCl based method for preparation of gallium-68 labeled radiopharmaceuticals has been adapted for use with an automated gallium-68 generator system. The method was evaluated based on 56 preparations of [68Ga]DOTATOC and compared to a similar acetone-based approach. Advantages of the new NaCl approach include reduced preparation time ( 97%), and specific activity (> 40 MBq nmole−1 [68Ga]DOTATOC) and is well-suited for clinical production of radiopharmaceuticals. PMID:23026223

  7. Base de dados INDEX PSI: recurso informacional na área de psicologia utilizando interface WWWIsis

    Directory of Open Access Journals (Sweden)

    Rosa Maria Vivona B. de Oliveira

    2000-01-01

    Full Text Available A Base de Dados Bibliográfica INDEX PSI (http://www.psicologia-online.org.br/index.html surgiu de um convênio firmado entre o Sistema de Bibliotecas e Informação da PUC-Campinas e o Conselho Federal de Psicologia, objetivando a organização da produção científica nacional na área de Psicologia, focalizando artigos de periódicos publicados no período de 1980 a 1999 com a finalidade de disseminação da informação gerada e preservação da memória científica. Utilizou-se, para entrada de dados, o software CDS-Microisis, versão 3.07 para DOS e interface WWWIsis para acesso via WEB. A Base INDEX PSI será objeto de construção de Biblioteca Virtual na área de Psicologia. The bibliographic database INDEX PSI was established through an agreement between the Information and Library System of PUC-Campinas and the Brazilian Federal Psychology Council, aiming at the organization of the national scientific production in the Psychology field. It focuses on serial articles published from 1980 to 1999, in order to disseminate the information produced and to preserve the scientific memory. To input data at this database it was used the software CDS-Microisis DOS version 3.07, and the interface WWWIsis to access through WEB. INDEX PSI as intended to be the beginning of a Psychology Virtual Library.

  8. Continuous modification of AK11 silumin with multicomponent salt on base of NaCl

    Directory of Open Access Journals (Sweden)

    J. Pezda

    2007-12-01

    Full Text Available Sodium belongs to the most effective modifying agents. The sodium can be brought into metal bath in metallic form or in form of chemical compounds comprising sodium, the most often in form of NaF. In the both above mentioned cases action of sodium is of very short duration, (what constitutes its main disadvantage, as lasting for about 15-20 minutes, mainly due to its evaporation from metal bath.Prolongation of modifying agent’s action can be accomplished due to technology of continuous introduction of sodium to metal bath. That technology is based on continuous electrolysis of sodium salt, occurring directly in melting pot with liquid alloy. Application of solid electrolyte – conducting sodium ions (ionic conductance – and simultaneously maintaining solid state of aggregation in melting and superheating temperature of alloy, i.e. 600÷800°C is indispensable for such process. Suitable sodium salt which is placed in retort produced from solid electrolyte shall undergo dissociation, and next electrolysis, in result of applied direct current. Sodium ions arisen during the dissociation of sodium salts and electrolysis are “conveyed” through retort walls made from solid electrolyte. In contact with liquid alloy as cathode, sodium ions pass to atomic state, modifying the alloy. The paper discusses results of initial study concerning process of continuous modification of AK11 silumin with use of multicomponent sodium salt on base of NaCl, shows results of tensile strength Rm and measurement of voltage drop for the alloy in solid state. Values of those parameters have confirmed obtained modification effect of investigated alloys. Assurance of stable run of continuous modification process brings about necessity of a further research aimed at optimization of parameters of the process.

  9. Recycling of Na in advanced life support: strategies based on crop production systems.

    Science.gov (United States)

    Guntur, S V; Mackowiak, C; Wheeler, R M

    1999-01-01

    Sodium is an essential dietary requirement in human nutrition, but seldom holds much importance as a nutritional element for crop plants. In Advanced Life Support (ALS) systems, recycling of gases, nutrients, and water loops is required to improve system closure. If plants are to play a significant role in recycling of human wastes, Na will need to accumulate in edible tissues for return to the crew diet. If crops fail to accumulate the incoming Na into edible tissues, Na could become a threat to the hydroponic food production system by increasing the nutrient solution salinity. Vegetable crops of Chenopodiaceae such as spinach, table beet, and chard may have a high potential to supply Na to the human diet, as Na can substitute for K to a large extent in metabolic processes of these crops. Various strategies are outlined that include both genetic and environmental management aspects to optimize the Na recovery from waste streams and their resupply through the human diet in ALS.

  10. In Vitro Priming of Naı̈ve T-cells with p-Phenylenediamine and Bandrowski's Base.

    Science.gov (United States)

    Gibson, Andrew; Kim, Seung-Hyun; Faulkner, Lee; Evely, Jane; Pirmohamed, Munir; Park, Kevin B; Naisbitt, Dean J

    2015-10-19

    p-Phenylenediamine (PPD) is a component of hair dye formulations that is associated with T-cell mediated allergic contact dermatitis. Antigen-specific T-cells from allergic contact dermatitis patients are activated with either PPD or the oxidation product, Bandrowski's base. In nonallergic individuals, T-cells that are activated by Bandrowski's base, but not by PPD, are readily detectable. The aim of the current study was to use an in vitro T-cell priming assay to assess the activation of memory and naı̈ve T-cells from healthy donors with PPD and Bandrowski's base, and to compare these responses to those observed from allergic patients. Both PPD and Bandrowski's base-responsive clones were generated from allergic patients. The majority of Bandrowski's base-responsive clones were CD4+ and displayed a lack of PPD reactivity. In contrast, CD4+ and CD8+ clones displaying PPD reactivity were detected. Approximately 25% of these displayed low levels of reactivity to Bandrowski's base. Clones from the allergic patients secreted a range of cytokines including IFN-γ, Il-13, and Il-22. In healthy donors, Bandrowski's base-specific T-cell proliferative responses and cytokine secretion were detected with both naı̈ve and memory T-cells. T-cell clones generated from the Bandrowski's base-responsive cultures responded to Bandrowski's base but not PPD. PPD-specific naı̈ve and memory T-cell responses were not detected from healthy donors. These data show that Bandrowski's base stimulates pre-existing memory T-cells isolated from healthy donors and primes naı̈ve T-cells when the chemical is bound to autologous dendritic cells. Priming naı̈ve T-cells against PPD failed, suggesting an important individual susceptibility factor is missing from the in vitro T-cell priming assay.

  11. XYO{sub 3} (X = K, Na; Y = Nb, Ta) based superlattices for photocatalysis

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Guang-Zhao; Chen, Xiao-Rui; Yuan, Hong-Kuan; Kuang, An-Long [School of Physical Science and Technology, Southwest University, Chongqing 400715 (China); Chen, Hong [School of Physical Science and Technology, Southwest University, Chongqing 400715 (China); Key Laboratory of Luminescent and Real-Time Analytical Chemistry, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715 (China)

    2017-05-15

    The photocatalytic activities of XYO{sub 3} (X = K, Na; Y = Ta, Nb) and XYO{sub 3}/X1Y1O{sub 3} (X, X1 = K, Na; Y, Y1 = Ta, Nb) systems are investigated by using hybrid density functional. All the XYO{sub 3} and XYO{sub 3}/X1Y1O{sub 3} systems are indirect band gap semiconductors, and the band gap of KNbO{sub 3}/KTaO{sub 3} is smaller than those of KNbO{sub 3} and KTaO{sub 3}, while the band gaps of KNbO{sub 3}/NaNbO{sub 3}, KNbO{sub 3}/NaTaO{sub 3}, KTaO{sub 3}/NaNbO{sub 3}, KTaO{sub 3}/NaTaO{sub 3}, and NaNbO{sub 3}/NaTaO{sub 3} are respectively between the band gaps of these two crystals which make up these superlattices. The electronic structure of KNbO{sub 3}/NaTaO{sub 3} is the same as that of KTaO{sub 3}/NaNbO{sub 3} since both have the same component and similar crystal structure. The band edges of all the considered superlattices are thermodynamically allowed for the water reduction and oxidation processes, and therefore, they could be used for photocatalytic water splitting. Band structures for (i) KNbO{sub 3}/KTaO{sub 3}, (ii) KNbO{sub 3}/NaNbO{sub 3}, (iii) KNbO{sub 3}/NaTaO{sub 3}, (iv) KTaO{sub 3}/NaNbO{sub 3}, (v) KTaO{sub 3}/NaTaO{sub 3}, and (vi) NaNbO{sub 3}/NaTaO{sub 3} superlattices. The horizontal dashed lines represent the Fermi levels. (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  12. Resistivity and Passivity Characterization of Ni-Base Glassy Alloys in NaOH Media

    Directory of Open Access Journals (Sweden)

    Khadijah M. Emran

    2018-01-01

    Full Text Available Resistivity and passivation behavior of two Ni-base bulk metallic glasses, with the nominal composition of Ni70Cr21Si0.5B0.5P8C ≤ 0.1Co ≤ 1Fe ≤ 1 (VZ1 and Ni72.65Cr7.3-Si6.7B2.15C ≤ 0.06Fe8.2Mo3 (VZ2, in various concentrations of NaOH solutions were studied. The investigations involved cyclic polarization (CP, electrochemical impedance spectroscopy (EIS, and electrochemical frequency modulation (EFM methods. Cyclic polarization measurements showed spontaneous passivation for both Ni-base glassy alloys at all alkaline concentrations, due to the presence of chromium as an alloying element that formed an oxide film on the alloy surface. The EIS analysis showed that the passive layers grown on the two Ni-base glassy alloy surfaces are formed by a double oxide layer structure. Scanning electron microscope (SEM examinations of the electrode surface showed Cr, Ni, Fe, and O rich corrosion products that reduced the extent of corrosion damage. Atomic force microscopy (AFM imaging technique was used to evaluate the topographic and morphologic features of surface layers formed on the surface of the alloys.

  13. NaVirCept - Nucleic Acid-Based Anti-Viral Project

    International Nuclear Information System (INIS)

    Stephen, E. R.; Wong, J.; Van Loon, D.

    2007-01-01

    Vaccines are generally considered to be the most effective countermeasures to bacterial and viral diseases, however, licensed vaccines against many disease agents are either not available or their efficacies have not been demonstrated. Vaccines are generally agent specific in terms of treatment spectrum and are subject to defeat through natural mutation or through directed efforts. With respect to viral therapeutics, one of the major limitations associated with antiviral drugs is acquired drug resistance caused by antigenic shift or drift. A number of next-generation prophylactic and/or therapeutic measures are on the horizon. Of these, nucleic acid-based drugs are showing great antiviral potential. These drugs elicit long-lasting, broad spectrum protective immune responses, especially to respiratory viral pathogens. The Nucleic Acid-Based Antiviral (NaVirCept) project provides the opportunity to demonstrate the effectiveness of novel medical countermeasures against military-significant endemic and other viral threat agents. This project expands existing DRDC drug delivery capability development, in the form of proprietary liposome intellectual property, by coupling it with leading-edge nucleic acid-based technology to deliver effective medical countermeasures that will protect deployed personnel and the warfighter against a spectrum of viral disease agents. The technology pathway will offer a means to combat emerging viral diseases or modified threat agents such as the bird flu or reconstructed Spanish flu without going down the laborious, time-consuming and expensive paths to develop countermeasures for each new and/or emerging viral disease organism.(author)

  14. Ultrahigh Piezoelectric Properties in Textured (K,Na)NbO3 -Based Lead-Free Ceramics.

    Science.gov (United States)

    Li, Peng; Zhai, Jiwei; Shen, Bo; Zhang, Shujun; Li, Xiaolong; Zhu, Fangyuan; Zhang, Xingmin

    2018-02-01

    High-performance lead-free piezoelectric materials are in great demand for next-generation electronic devices to meet the requirement of environmentally sustainable society. Here, ultrahigh piezoelectric properties with piezoelectric coefficients (d 33 ≈700 pC N -1 , d 33 * ≈980 pm V -1 ) and planar electromechanical coupling factor (k p ≈76%) are achieved in highly textured (K,Na)NbO 3 (KNN)-based ceramics. The excellent piezoelectric properties can be explained by the strong anisotropic feature, optimized engineered domain configuration in the textured ceramics, and facilitated polarization rotation induced by the intermediate phase. In addition, the nanodomain structures with decreased domain wall energy and increased domain wall mobility also contribute to the ultrahigh piezoelectric properties. This work not only demonstrates the tremendous potential of KNN-based ceramics to replace lead-based piezoelectrics but also provides a good strategy to design high-performance piezoelectrics by controlling appropriate phase and crystallographic orientation. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  15. Resist-based measurement of contrast transfer function in a 0.3-NA microfield optic

    International Nuclear Information System (INIS)

    Cain, Jason P.; Naulleau, Patrick; Spanos, Costas J.

    2005-01-01

    Although extreme ultraviolet (EUV) lithography offers the possibility of very high-resolution patterning, the projection optics must be of extremely high quality in order to meet this potential. One key metric of the projection optic quality is the contrast transfer function (CTF), which is a measure of the aerial image contrast as a function of pitch. A static microfield exposure tool based on the 0.3-NA MET optic and operating at a wavelength of 13.5 nm has been installed at the Advanced Light Source, a synchrotron facility at the Lawrence Berkeley National Laboratory. This tool provides a platform for a wide variety of research into EUV lithography. In this work we present resist-based measurements of the contrast transfer function for the MET optic. These measurements are based upon line/space patterns printed in several different EUV photoresists. The experimental results are compared with the CTF in aerial-image simulations using the aberrations measured in the projection optic using interferometry. In addition, the CTF measurements are conducted for both bright-field and dark-field mask patterns. Finally, the orientation dependence of the CTF is measured in order to evaluate the effect of non-rotationally symmetric lens aberrations. These measurements provide valuable information in interpreting the results of other experiments performed using the MET and similar systems

  16. (Na, K)NbO3-Based Ceramics for Self-Powered Energy Harvesting Applications.

    Science.gov (United States)

    Kim, Jinhwan; Koh, Jung-Hyuk

    2015-03-01

    Self-powered energy harvesting technologies have been intensively investigated by employ- ing Pb-free piezoelectric materials. One such Pb-free piezoelectric material, the ceramic 0.97(Na0.5K0.5)NbO3-0.03(Bi0.5Na0.5)TiO3, was prepared by employing the conventional mixed oxide method. 0.97(Na0.5K0.5)NbO3-0.03(Bi0.5Na0.5)TiO3 ceramics were prepared and the effect of sintering temperature on the microstructure, piezoelectric and ferroelectric properties were system- atically investigated for energy harvesting applications. The crystal structure of 0.97(Na0.5K0.5)NbO3- 0.03(Bi0.5Na0.5) TiO3 Pb-free piezoelectric ceramics, sintered at temperatures between 1080 °C and 1160 °C, was examined by X-ray diffraction analysis. The dielectric properties of 0.97(Na0.5K0.5)NbO3-0.03(Bi0.5Na0.5)TiO3 ceramics were measured from 1 kHz to 1 MHz for the various sintering temperatures. We expect that optimization of sintering parameters can improve the piezoelectric and ferroelectric properties of 0.97 (Na0.5K0.5)NbO3-0.03(Bi0.5Na0.5)TiO3 ceramics for energy harvesting.

  17. Utilização de subprodutos de origem animal em dietas formuladas com base em proteína bruta e proteína ideal para frangos de corte de 22 a 42 dias de idade

    OpenAIRE

    Cancherini,Luciana Cardoso; Junqueira,Otto Mack; Oliveira,Maria Cristina de; Andreotti,Marcelo de Oliveira; Barbosa,Maria José Baptista

    2005-01-01

    Foi conduzido um experimento para avaliar a utilização de subprodutos de origem animal em dietas para frangos de corte de 22 a 42 dias de idade, formuladas com base nos conceitos de proteína bruta e proteína ideal. O delineamento foi inteiramente casualizado em esquema fatorial 2x2+1, ou seja, duas fontes de proteína de origem animal (farinha de vísceras de aves e farinha de sangue bovino), dois conceitos de formulação (proteína bruta e proteína ideal) e uma dieta controle à base de milho e f...

  18. Movement imagery classification in EMOTIV cap based system by Naïve Bayes.

    Science.gov (United States)

    Stock, Vinicius N; Balbinot, Alexandre

    2016-08-01

    Brain-computer interfaces (BCI) provide means of communications and control, in assistive technology, which do not require motor activity from the user. The goal of this study is to promote classification of two types of imaginary movements, left and right hands, in an EMOTIV cap based system, using the Naïve Bayes classifier. A preliminary analysis with respect to results obtained by other experiments in this field is also conducted. Processing of the electroencephalography (EEG) signals is done applying Common Spatial Pattern filters. The EPOC electrodes cap is used for EEG acquisition, in two test subjects, for two distinct trial formats. The channels picked are FC5, FC6, P7 and P8 of the 10-20 system, and a discussion about the differences of using C3, C4, P3 and P4 positions is proposed. Dataset 3 of the BCI Competition II is also analyzed using the implemented algorithms. The maximum classification results for the proposed experiment and for the BCI Competition dataset were, respectively, 79% and 85% The conclusion of this study is that the picked positions for electrodes may be applied for BCI systems with satisfactory classification rates.

  19. GPU-based real-time triggering in the NA62 experiment

    CERN Document Server

    Ammendola, R.; Cretaro, P.; Di Lorenzo, S.; Fantechi, R.; Fiorini, M.; Frezza, O.; Lamanna, G.; Lo Cicero, F.; Lonardo, A.; Martinelli, M.; Neri, I.; Paolucci, P.S.; Pastorelli, E.; Piandani, R.; Pontisso, L.; Rossetti, D.; Simula, F.; Sozzi, M.; Vicini, P.

    2016-01-01

    Over the last few years the GPGPU (General-Purpose computing on Graphics Processing Units) paradigm represented a remarkable development in the world of computing. Computing for High-Energy Physics is no exception: several works have demonstrated the effectiveness of the integration of GPU-based systems in high level trigger of different experiments. On the other hand the use of GPUs in the low level trigger systems, characterized by stringent real-time constraints, such as tight time budget and high throughput, poses several challenges. In this paper we focus on the low level trigger in the CERN NA62 experiment, investigating the use of real-time computing on GPUs in this synchronous system. Our approach aimed at harvesting the GPU computing power to build in real-time refined physics-related trigger primitives for the RICH detector, as the the knowledge of Cerenkov rings parameters allows to build stringent conditions for data selection at trigger level. Latencies of all components of the trigger chain have...

  20. Oxide-Based Composite Electrolytes Using Na3Zr2Si2PO12/Na3PS4 Interfacial Ion Transfer.

    Science.gov (United States)

    Noi, Kousuke; Nagata, Yuka; Hakari, Takashi; Suzuki, Kenji; Yubuchi, So; Ito, Yusuke; Sakuda, Atsushi; Hayashi, Akitoshi; Tatsumisago, Masahiro

    2018-05-31

    All-solid-state sodium batteries using Na 3 Zr 2 Si 2 PO 12 (NASICON) solid electrolytes are promising candidates for safe and low-cost advanced rechargeable battery systems. Although NASICON electrolytes have intrinsically high sodium-ion conductivities, their high sintering temperatures interfere with the immediate development of high-performance batteries. In this work, sintering-free NASICON-based composites with Na 3 PS 4 (NPS) glass ceramics were prepared to combine the high grain-bulk conductivity of NASICON and the interfacial formation ability of NPS. Before the composite preparation, the NASICON/NPS interfacial resistance was investigated by modeling the interface between the NASICON sintered ceramic and the NPS glass thin film. The interfacial ion-transfer resistance was very small above room temperature; the area-specific resistances at 25 and 100 °C were 15.8 and 0.40 Ω cm 2 , respectively. On the basis of this smooth ion transfer, NASICON-rich (70-90 wt %) NASICON-NPS composite powders were prepared by ball-milling fine powders of each component. The composite powders were well-densified by pressing at room temperature. Scanning electron microscopy observation showed highly dispersed sub-micrometer NASICON grains in a dense NPS matrix to form closed interfaces between the oxide and sulfide solid electrolytes. The composite green (unfired) compacts with 70 and 80 wt % NASICON exhibited high total conductivities at 100 °C of 1.1 × 10 -3 and 6.8 × 10 -4 S cm -1 , respectively. An all-solid-state Na 15 Sn 4 /TiS 2 cell was constructed using the 70 wt % NASICON composite electrolyte by the uniaxial pressing of the powder materials, and its discharge properties were evaluated at 100 °C. The cell showed the reversible capacities of about 120 mAh g -1 under the current density of 640 μA cm -2 . The prepared oxide-based composite electrolytes were thus successfully applied in all-solid-state sodium rechargeable batteries without sintering.

  1. The necessity of renovation of the fundamental concepts of geochemistry for the geothermal systems; La necesidad de renovacion de los conceptos fundamentales de geoquimica para los sistemas geotermicos

    Energy Technology Data Exchange (ETDEWEB)

    Mahendra Jaiswal, Pal Verma [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    1999-07-01

    In this article the exhaustive experimentation of the compilation of the experimental data of quartz solubility is presented along with the saturation curve water - steam and in the zone of compressed liquid. On the base of these data a regression relation was derived, which is valid for the entire range of temperature from 0 to 374 Celsius degrees. This study was developed by Mahendra Pal Verma Jaiswal, researcher of the Instituto de Investigaciones Electricas (IIE) [Spanish] En este articulo se presenta el experimento exhaustivo de la recopilacion de los datos experimentales de la solubilidad de cuarzo a lo largo de la curva de saturacion agua - vapor y en la zona de liquido comprimido. Sobre la base de estos datos se derivo una relacion de regresion, la cual es valida para todo el rango de temperatura desde 0 a 374 grados Celsius. Este estudio fue desarrollado por Mahendra Pal Verma Jaiswal, investigador del Instituto de Investigaciones Electricas (IIE)

  2. Destabilized LiBH4-NaAlH4 Mixtures Doped with Titanium Based Catalysts

    DEFF Research Database (Denmark)

    Shi, Qing; Yu, Xuebin; Feidenhans'l, Robert

    2008-01-01

    We investigate the hydrogen storage properties of the mixed complex hydride LiBH4-NaAlH4 system, both undoped and doped with a TiCl3 additive. The mixed system is found to initiate a transformation to LiBH4-NaAlH4 after ball-milling, and the doped system is found to have a significant lower hydro...

  3. Construction of naïve camelids VHH repertoire in phage display-based library.

    Science.gov (United States)

    Sabir, Jamal S M; Atef, Ahmed; El-Domyati, Fotouh M; Edris, Sherif; Hajrah, Nahid; Alzohairy, Ahmed M; Bahieldin, Ahmed

    2014-04-01

    Camelids have unique antibodies, namely HCAbs (VHH) or commercially named Nanobodies(®) (Nb) that are composed only of a heavy-chain homodimer. As libraries based on immunized camelids are time-consuming, costly and likely redundant for certain antigens, we describe the construction of a naïve camelid VHHs library from blood serum of non-immunized camelids with affinity in the subnanomolar range and suitable for standard immune applications. This approach is rapid and recovers VHH repertoire with the advantages of being more diverse, non-specific and devoid of subpopulations of specific antibodies, which allows the identification of binders for any potential antigen (or pathogen). RNAs from a number of camelids from Saudi Arabia were isolated and cDNAs of the diverse vhh gene were amplified; the resulting amplicons were cloned in the phage display pSEX81 vector. The size of the library was found to be within the required range (10(7)) suitable for subsequent applications in disease diagnosis and treatment. Two hundred clones were randomly selected and the inserted gene library was either estimated for redundancy or sequenced and aligned to the reference camelid vhh gene (acc. No. ADE99145). Results indicated complete non-specificity of this small library in which no single event of redundancy was detected. These results indicate the efficacy of following this approach in order to yield a large and diverse enough gene library to secure the presence of the required version encoding the required antibodies for any target antigen. This work is a first step towards the construction of phage display-based biosensors useful in disease (e.g., TB or tuberculosis) diagnosis and treatment. Copyright © 2014 Académie des sciences. Published by Elsevier SAS. All rights reserved.

  4. The unfolding of NaI(Tl) γ-ray spectrum based on maximum likelihood method

    International Nuclear Information System (INIS)

    Zhang Qingxian; Ge Liangquan; Gu Yi; Zeng Guoqiang; Lin Yanchang; Wang Guangxi

    2011-01-01

    NaI(Tl) detectors, having a good detection efficiency, are used to detect gamma rays in field surveys. But the poor energy resolution hinders their applications, despite the use of traditional methods to resolve the overlapped gamma-ray peaks. In this paper, the maximum likelihood (ML) solution is used to resolve the spectrum. The ML method,which is capable of decomposing the peaks in energy difference of over 2/3 FWHM, is applied to scale NaI(Tl) the spectrometer. The result shows that the net area is in proportion to the content of isotopes and the precision of scaling is better than the stripping ration method. (authors)

  5. ANÁLISE E DESENVOLVIMENTO DE SORVETE A BASE DE PROTEÍNA

    OpenAIRE

    Reck, Isabela Maria; Universidade Estadual de Maringa; Gazeloto, Sarah Alves; Universidade Estadual de Maringá – UEM – Maringá/PR – Brasil; Souza Junior, Robson Camillo de; Universidade Estadual de Maringá – UEM – Maringá/PR – Brasil; Santos, Adriana Vieira dos; Universidade Estadual de Maringá – UEM – Maringá/PR – Brasil; Henschel, Marcela Tiemi Nakayama; Universidade Estadual de Maringá – UEM – Maringá/PR – Brasil; Madrona, Grasiele Scaramal; Universidade Estadual de Maringá – UEM – Maringá/PR – Brasil

    2016-01-01

    A preocupação com a saúde elevou a demanda por produtos naturais e saudáveis, assim, elevando o rendimento físicos de atletas e não atletas, levou ao aumento do consumo de suplementos que potencializam esse efeito. O sorvete é um produto que agrada aos mais variados paladares e as proteínas contribuem para o desenvolvimento da estrutura do sorvete. As proteínas auxiliam na manutenção do músculo e outros tecidos e pode ser utilizada como substituto de gorduras na formulação. O trabalho teve co...

  6. Impact of intense x-ray pulses on a NaI(Tl)-based gamma camera

    NARCIS (Netherlands)

    Koppert, Wilco J C; van der Velden, Sandra; Steenbergen, J H Leo; de Jong, Hugo W A M

    2018-01-01

    INTRODUCTION: In SPECT/CT systems X-ray and -ray imaging is performed sequentially. Simultaneous acquisition may have advantages, for instance in interventional settings. However, this may expose a gamma camera to relatively high X-ray doses and deteriorate its functioning. We studied the NaI(Tl)

  7. ANÁLISE E DESENVOLVIMENTO DE SORVETE A BASE DE PROTEÍNA

    Directory of Open Access Journals (Sweden)

    Isabela Maria Reck

    2016-03-01

    Full Text Available A preocupação com a saúde elevou a demanda por produtos naturais e saudáveis, assim, elevando o rendimento físicos de atletas e não atletas, levou ao aumento do consumo de suplementos que potencializam esse efeito. O sorvete é um produto que agrada aos mais variados paladares e as proteínas contribuem para o desenvolvimento da estrutura do sorvete. As proteínas auxiliam na manutenção do músculo e outros tecidos e pode ser utilizada como substituto de gorduras na formulação. O trabalho teve como objetivo desenvolver um sorvete proteico e utilizar a proteína do soro de leite como um substituto de gordura e obter um produto com baixo teor de gordura. Antes do desenvolvimento do produto foi realizada uma pesquisa de mercado para identificar as preferências e exigências dos consumidores. Obtiveram-se duas formulações, uma com 6 g proteína e outra com 8 g por porção de 60 g de sorvete, escolhas estas feitas a partir da alteração mínima do sabor agradável do sorvete. Realizou-se uma análise sensorial dos dois sorvetes para avaliar a aceitação do público. Pode-se concluir que, ao aumentar a quantidade de proteína do produto e reduzir a quantidade de gorduras, o sorvete foi aprovado pelos consumidores, tornando-se viável a sua comercialização. 

  8. Synthesis and luminescent features of NaCaPO4:Tb3+ green phosphor for near UV-based LEDs

    International Nuclear Information System (INIS)

    Ratnam, B.V.; Jayasimhadri, M.; Bhaskar Kumar, G.; Jang, Kiwan; Kim, S.S.; Lee, Y.I.; Lim, J.M.; Shin, D.S.; Song, T.K.

    2013-01-01

    Highlights: ► Successfully synthesized orthorhombic phase of NaCaPO 4 (NCP) phosphors ► Structural and Luminescent properties have been investigated. ► In the excitation spectrum, 7 F 6 → 5 G 6 transition at 370 nm exhibit highest intensity. ► CIE coordinates of Tb 3+ : NCP phosphor indicate green light emission in CIE diagram. ► Hence, Tb 3+ doped NaCaPO 4 is suitable for UV based pc-LEDs. -- Abstract: An efficient green emitting Tb 3+ doped NaCaPO 4 (NCP) phosphor was synthesized by using conventional solid-state reaction for solid-state lighting applications. X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), FT-IR, emission and excitation properties were extensively investigated for NCP phosphors. X-ray diffraction analysis confirmed the formation of NaCaPO 4 with orthorhombic structure. The excitation spectrum consists of strong 4f–4f transition at around 370 nm, which has higher intensity than the f–d transition. Emission spectra indicated that this phosphor can be efficiently excited by UV light in the range from 250 to 400 nm, and shows strong emission band centered at 547 nm. Analysis of the emission spectra with different Tb 3+ concentrations revealed that the optimum dopant concentration for these NCP phosphors is about 5 mol% of Tb 3+ . Diminishing of 5 D 3 level and increasing of 5 D 4 level emission intensity with the Tb 3+ concentration explained successfully. The emission color was analyzed and confirmed with the help of chromaticity coordinates and color temperature. The excellent luminescent properties of NaCaPO 4 :Tb 3+ phosphor makes it as a potential green phosphor upon near-UV LED excitation

  9. Influence of activating solution and the addition of NaF on metakaolin-based geopolymer physico-chemical properties

    International Nuclear Information System (INIS)

    Agullo, J.; Muzeau, B.; Trepy, N.; L'Hostis, V.; Lambertin, D.

    2015-01-01

    The technology of geo-polymerisation is attracting a lot of interest due to the wide variety of potential applications. Recently emerging and alternative cementitious systems based on geo-polymers have been reported in literature. Geo-polymer materials have been proposed as new binders for safe radioactive waste containment. Moreover, their good fluidity and fire resistance make them compatible with industrial processes for embedding wastes. The purpose of this work was to investigate the physico-chemical properties of meta-kaolin-based geo-polymer which could be used as mineral binder for encapsulation of metallic nuclear wastes. To improve the knowledge of this binder, its microstructure and its interstitial solution have been characterized during hydration (up to 28 days). Interstitial solutions were extracted at different hydration time and subsequent analyses allow us to determine their chemical composition. pH measurements confirm the high alkalinity of the interstitial pore solution. The influence of the activating solution (NaOH or KOH) and the addition of NaF as corrosion inhibitor in the geo-polymer composition were also studied. The nature of different crystalline phases was identified by X-ray diffraction. Water accessible porosity for these materials was estimated around 59%. The pore size distribution was determined by mercury intrusion porosity. Alkaline cations have proved to induce changes in the pore size distribution, these ones coming from whether the activating solution or the NaF addition. (authors)

  10. Lane-Level Road Information Mining from Vehicle GPS Trajectories Based on Naïve Bayesian Classification

    Directory of Open Access Journals (Sweden)

    Luliang Tang

    2015-11-01

    Full Text Available In this paper, we propose a novel approach for mining lane-level road network information from low-precision vehicle GPS trajectories (MLIT, which includes the number and turn rules of traffic lanes based on naïve Bayesian classification. First, the proposed method (MLIT uses an adaptive density optimization method to remove outliers from the raw GPS trajectories based on their space-time distribution and density clustering. Second, MLIT acquires the number of lanes in two steps. The first step establishes a naïve Bayesian classifier according to the trace features of the road plane and road profiles and the real number of lanes, as found in the training samples. The second step confirms the number of lanes using test samples in reference to the naïve Bayesian classifier using the known trace features of test sample. Third, MLIT infers the turn rules of each lane through tracking GPS trajectories. Experiments were conducted using the GPS trajectories of taxis in Wuhan, China. Compared with human-interpreted results, the automatically generated lane-level road network information was demonstrated to be of higher quality in terms of displaying detailed road networks with the number of lanes and turn rules of each lane.

  11. Piezoelectric Active Humidity Sensors Based on Lead-Free NaNbO3 Piezoelectric Nanofibers

    Directory of Open Access Journals (Sweden)

    Li Gu

    2016-06-01

    Full Text Available The development of micro-/nano-scaled energy harvesters and the self-powered sensor system has attracted great attention due to the miniaturization and integration of the micro-device. In this work, lead-free NaNbO3 piezoelectric nanofibers with a monoclinic perovskite structure were synthesized by the far-field electrospinning method. The flexible active humidity sensors were fabricated by transferring the nanofibers from silicon to a soft polymer substrate. The sensors exhibited outstanding piezoelectric energy-harvesting performance with output voltage up to 2 V during the vibration process. The output voltage generated by the NaNbO3 sensors exhibited a negative correlation with the environmental humidity varying from 5% to 80%, where the peak-to-peak value of the output voltage generated by the sensors decreased from 0.40 to 0.07 V. The sensor also exhibited a short response time, good selectively against ethanol steam, and great temperature stability. The piezoelectric active humidity sensing property could be attributed to the increased leakage current in the NaNbO3 nanofibers, which was generated due to proton hopping among the H3O+ groups in the absorbed H2O layers under the driving force of the piezoelectric potential.

  12. Solid strong base K-Pt/NaY zeolite nano-catalytic system for completed elimination of formaldehyde at room temperature

    Science.gov (United States)

    Song, Shaoqing; Wu, Xi; Lu, Changhai; Wen, Meicheng; Le, Zhanggao; Jiang, Shujuan

    2018-06-01

    Solid strong base nano-catalytic system of K-modification NaY zeolite supported 0.08% Pt (K-Pt/NaY) were constructed for eliminating HCHO at room temperature. In the catalytic process, activation energy over K-Pt/NaY nano-catalytic system was greatly decreased along with the enhanced reaction rate. Characterization and catalytic tests revealed the surface electron structure of K-Pt/NaY was improved, as reflected by the enhanced HCHO adsorption capability, high sbnd OH concentration, and low-temperature reducibility. Therefore, the optimal K-Pt/NaY showed high catalytic efficiency and strong H2O tolerance for HCHO elimination by directly promoting the reaction between active sbnd OH and formate species. These results may suggest a new way for probing the advanced solid strong base nano-catalytic system for the catalytic elimination of indoor HCHO.

  13. Secagem de tomate (Lycopersicon esculentum Mill) para conserva : estudo de parametros com base na qualidade final

    OpenAIRE

    Gisele Anne Camargo

    2000-01-01

    Resumo: o tomate seco tem apresentado crescente aplicação na culinária brasileira, principalmente, como ingrediente de massas, pizzas e também no consumo imediato. Com a finalidade de estudar a influência de parâmetros de secagem sobre a eficiência do processo e sobre a qualidade do produto final, foi desenvolvida uma pesquisa utilizando tomates de duas variedades: uma variedade industrial (Rio Grande) e outra de tomate de mesa (Debora Plus). Cada uma das variedades foi analisada quanto ao co...

  14. Impact of intense x-ray pulses on a NaI(Tl)-based gamma camera

    Science.gov (United States)

    Koppert, W. J. C.; van der Velden, S.; Steenbergen, J. H. L.; de Jong, H. W. A. M.

    2018-03-01

    In SPECT/CT systems x-ray and γ-ray imaging is performed sequentially. Simultaneous acquisition may have advantages, for instance in interventional settings. However, this may expose a gamma camera to relatively high x-ray doses and deteriorate its functioning. We studied the NaI(Tl) response to x-ray pulses with a photodiode, PMT and gamma camera, respectively. First, we exposed a NaI(Tl)-photodiode assembly to x-ray pulses to investigate potential crystal afterglow. Next, we exposed a NaI(Tl)-PMT assembly to 10 ms LED pulses (mimicking x-ray pulses) and measured the response to flashing LED probe-pulses (mimicking γ-pulses). We then exposed the assembly to x-ray pulses, with detector entrance doses of up to 9 nGy/pulse, and analysed the response for γ-pulse variations. Finally, we studied the response of a Siemens Diacam gamma camera to γ-rays while exposed to x-ray pulses. X-ray exposure of the crystal, read out with a photodiode, revealed 15% afterglow fraction after 3 ms. The NaI(Tl)-PMT assembly showed disturbances up to 10 ms after 10 ms LED exposure. After x-ray exposure however, responses showed elevated baselines, with 60 ms decay-time. Both for x-ray and LED exposure and after baseline subtraction, probe-pulse analysis revealed disturbed pulse height measurements shortly after exposure. X-ray exposure of the Diacam corroborated the elementary experiments. Up to 50 ms after an x-ray pulse, no events are registered, followed by apparent energy elevations up to 100 ms after exposure. Limiting the dose to 0.02 nGy/pulse prevents detrimental effects. Conventional gamma cameras exhibit substantial dead-time and mis-registration of photon energies up to 100 ms after intense x-ray pulses. This is due PMT limitations and due to afterglow in the crystal. Using PMTs with modified circuitry, we show that deteriorative afterglow effects can be reduced without noticeable effects on the PMT performance, up to x-ray pulse doses of 1 nGy.

  15. Diagn?stico para melhoria de servi?os com base na filosofia lean office: um estudo de caso na DAP/DEPES/UFAM

    OpenAIRE

    Silva, Maria de F?tima Nascimento

    2011-01-01

    Este trabalho apresenta diagn?stico situacional realizado na Divis?o de Aposentadoria e Pens?o DAP do Departamento de Pessoal DEPES da Universidade Federal do Amazonas UFAM, tendo como principal motiva??o a identifica??o de ?reas pass?veis a melhorias na divis?o supracitada, no desejo de proposi??o de transforma??o da administra??o p?blica, considerando a necess?ria mudan?a e adequa??o dos ?rg?os p?blicos ? era globalizada e informatizada, uma vez que estes os ?rg?os p?blicos nacionai...

  16. Application of full spectrum analysis technique for NaI(TI) based gamma ray spectral monitoring system

    International Nuclear Information System (INIS)

    Pant, Amar D.; Verma, Amit K.; Narayani, K.; Anilkumar, S.; Singh, Rajvir

    2016-01-01

    NaI(Tl) is commonly used for the gamma spectrometry analysis in laboratories. It continues to be the first choice for gamma spectrometry in many applications even today. Many gamma spectrometric methods are developed to experimentally determine activity of radionuclides in samples. Detectors used worldwide for gamma radiation monitoring are either GM based or scintillator based detector based on count rate. For radiation early warning systems radionuclide specific radiation monitoring methodology is required i.e. gamma ray spectrometry based environmental monitoring system. A computer program has been developed for gamma spectral monitoring by the use of full spectrum analysis (FSA). In this measured spectra are fitted using individual spectral components by least square fitting (LSF). The method is found very useful in situations, where radionuclide specific environmental radiation monitoring is required. The paper describes the details of the FSA procedure for the on line acquisition and analysis of gamma ray spectra from Nal(Tl) detectors

  17. High-Capacity Sodium Peroxide Based NaO2 Batteries with Low Charge Overpotential via a Nanostructured Catalytic Cathode

    Energy Technology Data Exchange (ETDEWEB)

    Ma, Lu; Zhang, Dongzhou [Partnership; Lei, Yu [Department; Yuan, Yifei; Wu, Tianpin; Lu, Jun; Amine, Khalil

    2018-01-05

    The superoxide based Na-O-2 battery has circumvented the issue of large charge overpotential in Li-O-2 batteries; however, the one-electron process leads to limited capacity. Herein, a sodium peroxide based low-overpotential (similar to 0.5 V) Na-O-2 battery with a capacity as high as 7.5 mAh/cm(2) is developed with Pd nanoparticles as catalysts on the cathode.

  18. A Chimeric NaV1.8 Channel Expression System Based on HEK293T Cell Line

    Directory of Open Access Journals (Sweden)

    Xi Zhou

    2018-04-01

    Full Text Available Among the nine voltage-gated sodium channel (NaV subtypes, NaV1.8 is an attractive therapeutic target for pain. The heterologous expression of recombinant NaV1.8 currents is of particular importance for its electrophysiological and pharmacological studies. However, NaV1.8 expresses no or low-level functional currents when transiently transfected into non-neuronal cell lines. The present study aims to explore the molecular determinants limiting its functional expression and accordingly establish a functional NaV1.8 expression system. We conducted screening analysis of the NaV1.8 intracellular loops by constructing NaV chimeric channels and confirmed that the NaV1.8 C-terminus was the only limiting factor. Replacing this sequence with that of NaV1.4, NaV1.5, or NaV1.7 constructed functional channels (NaV1.8/1.4L5, NaV1.8/1.5L5, and NaV1.8/1.7L5, respectively, which expressed high-level NaV1.8-like currents in HEK293T cells. The chimeric channel NaV1.8/1.7L5 displayed much faster inactivation of its macroscopic currents than NaV1.8/1.4L5 and NaV1.8/1.5L5, and it was the most similar to wild-type NaV1.8 expressed in ND7/23 cells. Its currents were very stable during repetitive depolarizations, while its repriming kinetic was different from wild-type NaV1.8. Most importantly, NaV1.8/1.7L5 pharmacologically resembled wild-type NaV1.8 as revealed by testing their susceptibility to two NaV1.8 selective antagonists, APETx-2 and MrVIB. NaV chimeras study showed that at least the domain 2 and domain 4 of NaV1.8 were involved in binding with APETx-2. Our study provided new insights into the function of NaV1.8 intracellular loops, as well as a reliable and convenient expression system which could be useful in NaV1.8 studies.

  19. Multicolor light emitters based on energy exchange between Tb and Eu ions co-doped into ultrasmall β-NaYF 4 nanocrystals

    KAUST Repository

    Podhorodecki, Artur P.

    2012-01-01

    Multicolor emission is reported from ultrasmall (<10 nm) β-NaYF4:Eu,Tb nanocrystals depending on the excitation wavelengths or emission detection delay time. Detailed optical investigations of three samples (NaYF4:Eu, NaYF4:Tb and NaYF4:Eu,Tb) obtained by a co-thermolysis method have been carried out. Photoluminescence, photoluminescence excitation and emission decay time obtained at different excitation wavelengths have been measured. Excitation mechanisms of Eu and Tb ions have been explained based on the experimental results and calculations using Judd-Ofelt theory. It has been shown that efficient energy transfer from Tb to Eu ions accounts for the efficient red emission of NaYF4:Tb,Eu nanocrystals. © The Royal Society of Chemistry 2012.

  20. Optimization of NaOH Molarity, LUSI Mud/Alkaline Activator, and Na2SiO3/NaOH Ratio to Produce Lightweight Aggregate-Based Geopolymer

    Directory of Open Access Journals (Sweden)

    Rafiza Abdul Razak

    2015-05-01

    Full Text Available This paper presents the mechanical function and characterization of an artificial lightweight geopolymer aggregate (ALGA using LUSI (Sidoarjo mud and alkaline activator as source materials. LUSI stands for LU-Lumpur and SI-Sidoarjo, meaning mud from Sidoarjo which erupted near the Banjarpanji-1 exploration well in Sidoarjo, East Java, Indonesia on 27 May 2006. The effect of NaOH molarity, LUSI mud/Alkaline activator (LM/AA ratio, and Na2SiO3/NaOH ratio to the ALGA are investigated at a sintering temperature of 950 °C. The results show that the optimum NaOH molarity found in this study is 12 M due to the highest strength (lowest AIV value of 15.79% with lower water absorption and specific gravity. The optimum LUSI mud/Alkaline activator (LM/AA ratio of 1.7 and the Na2SiO3/NaOH ratio of 0.4 gives the highest strength with AIV value of 15.42% with specific gravity of 1.10 g/cm3 and water absorption of 4.7%. The major synthesized crystalline phases were identified as sodalite, quartz and albite. Scanning Electron Microscope (SEM image showed more complete geopolymer matrix which contributes to highest strength of ALGA produced.

  1. Optimization of NaOH Molarity, LUSI Mud/Alkaline Activator, and Na2SiO3/NaOH Ratio to Produce Lightweight Aggregate-Based Geopolymer

    Science.gov (United States)

    Abdul Razak, Rafiza; Abdullah, Mohd Mustafa Al Bakri; Hussin, Kamarudin; Ismail, Khairul Nizar; Hardjito, Djwantoro; Yahya, Zarina

    2015-01-01

    This paper presents the mechanical function and characterization of an artificial lightweight geopolymer aggregate (ALGA) using LUSI (Sidoarjo mud) and alkaline activator as source materials. LUSI stands for LU-Lumpur and SI-Sidoarjo, meaning mud from Sidoarjo which erupted near the Banjarpanji-1 exploration well in Sidoarjo, East Java, Indonesia on 27 May 2006. The effect of NaOH molarity, LUSI mud/Alkaline activator (LM/AA) ratio, and Na2SiO3/NaOH ratio to the ALGA are investigated at a sintering temperature of 950 °C. The results show that the optimum NaOH molarity found in this study is 12 M due to the highest strength (lowest AIV value) of 15.79% with lower water absorption and specific gravity. The optimum LUSI mud/Alkaline activator (LM/AA) ratio of 1.7 and the Na2SiO3/NaOH ratio of 0.4 gives the highest strength with AIV value of 15.42% with specific gravity of 1.10 g/cm3 and water absorption of 4.7%. The major synthesized crystalline phases were identified as sodalite, quartz and albite. Scanning Electron Microscope (SEM) image showed more complete geopolymer matrix which contributes to highest strength of ALGA produced. PMID:26006238

  2. Produção de conhecimento sobre autismo na escola: uma revisão sistemática na base Scielo

    Directory of Open Access Journals (Sweden)

    Kelda de Fátima Pereira

    2016-07-01

    Full Text Available Objetivo: analisar a produção de artigos científicos sobre autismo nas escolas, disponibilizados na base de dados Scielo. Método: os descritores utilizados foram “autismo” combinado com “escola”. Os critérios de inclusão foram: artigos originais em língua portuguesa; artigos completos publicados em periódicos nacionais; pesquisas de campo no ambiente escolar; e, amostra composta por crianças com autismo. Os dados coletados versam sobre: a revista, o ano de publicação, os objetivos, as estratégias metodológicas e os principais resultados. A busca ocorreu em fevereiro de 2016. Resultados: foram encontrados 21 artigos, sendo que seis atenderam aos critérios de inclusão e foram selecionados para análise. As publicações ocorreram entre 2007 a 2015, nas Revistas: Psicopedagogia (n=02, Brasileira de Educação Especial (n=02, Educação e Pesquisa (n=01 e Psicologia: Teoria e Pesquisa (n=01. Os objetivos dos artigos variaram desde avaliação do perfil psicomotor e da competência social entre crianças típicas e atípicas, avaliação da funcionalidade de crianças com autismo, avaliação dos efeitos de programas de intervenção, verificação do preparo de professores de educação inclusiva e descrição do ensino de habilidades matemáticas. Quanto ao delineamento utilizado, há predomínio de pesquisas quantitativas (n=05. As pesquisas se caracterizaram como transversais (n=03 e longitudinais (n=03. Os participantes dos estudos foram indivíduos com autismo e seus pares sem deficiência, crianças sem diagnóstico concluído e professores. Considerações finais: os resultados demonstraram que programas de intervenção são benéficos para os indivíduos com autismo, quanto a psicomotricidade, cognição, linguagem, interações sociais e habilidades matemáticas (adição e subtração. As avaliações indicaram que os indivíduos com autismo têm melhores desempenhos em testes do que muitas vezes a literatura

  3. Solubility of flue gas components in NaOH based scrubber solutions

    Energy Technology Data Exchange (ETDEWEB)

    Sandelin, K; Backman, R

    1997-11-01

    The work reported here is a thermodynamic study on the solubility of flue gas components in aqueous solutions containing sodium salts. The result of the work is an equilibrium model. The model presented here includes sodium hydroxide and sodium salts that makes it possible to study simultaneous absorption of flue gas components in alkaline scrubber solutions. The model is applied on the absorption of a flue gas into a NaOH scrubber solution. The calculations show that it is possible to simultaneously absorb sulfur dioxide, sulfuric acid, and ammonia without carbon dioxide co-absorption. The calculations also show that gaseous NO and N{sub 2}O cannot be scrubbed unless they are oxidized to nitrate or reduced to ammonia. (author) SIHTI 2 Research Programme. 59 refs.

  4. ADS based on NaF-PbF2 molten salt

    International Nuclear Information System (INIS)

    Volk, V.I.; Vakhrushin, A.Yu.; Kwaratzkheli, A.Yu.; Konev, V.N.; Kochurov, B.P.; Shvedov, O.V.

    1999-01-01

    The neutron-physical parameters of an accelerator driven system (ADS) with a proton accelerator feeding a sub-critical molten salt blanket are investigated. The installation is designed for the production of electric power, involving thorium in a fuel cycle, transmutation of fission products and actinides. It is supposed to use fluoride salt composition 66PbF 2 -34NaF with addition of heavy elements (Th, Np, Pu and minor actinides) as the material of fuel, coolant and target. The thermal power of this ADS is 2000 MW. The current of the 1 GeV proton beam is 29 mA. The investigations are carried out for the following fuel cycles: the plutonium one, the burning of Np and minor actinides and the plutonium-thorium cycle. The balances of nuclides systems under supposition of its continuous operation during 20 years are presented [ru

  5. Investigation and optimisation of mobile NaI(Tl) and 3He-based neutron detectors for finding point sources

    International Nuclear Information System (INIS)

    Nilsson, Jonas M.C.; Finck, Robert R.; Rääf, Christopher

    2015-01-01

    Neutron radiation produces high-energy gamma radiation through (n,γ) reactions in matter. This can be used to detect neutron sources indirectly using gamma spectrometers. The sensitivity of a gamma spectrometer to neutrons can be amplified by surrounding it with polyvinyl chloride (PVC). The hydrogen in the PVC acts as a moderator and the chlorine emits prompt gammas when a neutron is captured. A 4.7-l 3 He-based mobile neutron detector was compared to a 4-l NaI(Tl)-detector covered with PVC using this principle. Methods were also developed to optimise the measurement parameters of the systems. The detector systems were compared with regard to their ability to find 241 AmBe, 252 Cf and 238 Pu– 13 C neutron sources. Results from stationary measurements were used to calculate optimal integration times as well as minimum detectable neutron emission rates. It was found that the 3 He-based detector was more sensitive to 252 Cf sources whereas the NaI(Tl) detector was more sensitive to 241 AmBe and 238 Pu– 13 C sources. The results also indicated that the sensitivity of the detectors to sources at known distances could theoretically be improved by 60% by changing from fixed integration times to list mode in mobile surveys

  6. Regulation of branchial V-H(+)-ATPase, Na(+)/K(+)-ATPase and NHE2 in response to acid and base infusions in the Pacific spiny dogfish (Squalus acanthias).

    Science.gov (United States)

    Tresguerres, Martin; Katoh, Fumi; Fenton, Heather; Jasinska, Edyta; Goss, Greg G

    2005-01-01

    To study the mechanisms of branchial acid-base regulation, Pacific spiny dogfish were infused intravenously for 24 h with either HCl (495+/- 79 micromol kg(-1) h(-1)) or NaHCO(3) (981+/-235 micromol kg(-1) h(-1)). Infusion of HCl produced a transient reduction in blood pH. Despite continued infusion of acid, pH returned to normal by 12 h. Infusion of NaHCO(3) resulted in a new steady-state acid-base status at approximately 0.3 pH units higher than the controls. Immunostained serial sections of gill revealed the presence of separate vacuolar proton ATPase (V-H(+)-ATPase)-rich or sodium-potassium ATPase (Na(+)/K(+)-ATPase)-rich cells in all fish examined. A minority of the cells also labeled positive for both transporters. Gill cell membranes prepared from NaHCO(3)-infused fish showed significant increases in both V-H(+)-ATPase abundance (300+/-81%) and activity. In addition, we found that V-H(+)-ATPase subcellular localization was mainly cytoplasmic in control and HCl-infused fish, while NaHCO(3)-infused fish demonstrated a distinctly basolateral staining pattern. Western analysis in gill membranes from HCl-infused fish also revealed increased abundance of Na(+)/H(+) exchanger 2 (213+/-5%) and Na(+)/K(+)-ATPase (315+/-88%) compared to the control.

  7. A data base for thermodynamic modeling of +III actinide solubility in concentrated Na-Cl-SO4-CO3-PO4 electrolytes

    International Nuclear Information System (INIS)

    Novak, C.F.; Crafts, C.C.; Dhooge, N.J.

    1995-01-01

    The literature contains thermodynamic parameters for describing the chemical behavior of the following: Am(III) in dilute NaHCO 3 media; Nd(III) in dilute to concentrated Na 2 CO 3 and NaHCO 3 media; Pu(III) in dilute to concentrated NaCl media; Nd(III)/Am(III) in dilute to concentrated Na 2 SO 4 media; and Am(III) in NaH 2 PO 4 media. We have combined this information into a thermodynamic data base for the general +III actinide, An(III), using the analogy for chemical behavior of f-elements in the same oxidation state. This internally consistent data base is based on equilibrium thermodynamics and the specific ion interaction activity coefficient formalism of Pitzer. This data base forms the basis for the prediction of potential Am(III) and Pu(III) dissolved concentrations in the concentrated natural brines associated with the Waste Isolation Pilot Plant (WIPP) in Southeastern New Mexico, USA

  8. Crystal structures and magnetic properties of iron (III)-based phosphates: Na4NiFe(PO4)3 and Na2Ni2Fe(PO4)3

    International Nuclear Information System (INIS)

    Essehli, Rachid; Bali, Brahim El; Benmokhtar, Said; Bouziane, Khalid; Manoun, Bouchaib; Abdalslam, Mouner Ahmed; Ehrenberg, Helmut

    2011-01-01

    Graphical abstract: A perspective view of the Na 2 Ni 2 Fe(PO 4 ) 3 structure along the [0 0 1] direction. Both compounds seem to exibit antiferromagnetic interactions between magnetic entities at low temperature. Display Omitted Research highlights: → Nasicon and Alluaudite compounds, Iron(III)-based phosphates, Crystal structures of Na 4 NiFe(PO 4 ) 3 and Na 2 Ni 2 Fe(PO 4 ) 3 . → Magnetism behaviours of Na 4 NiFe(PO 4 ) 3 and Na 2 Ni 2 Fe(PO 4 ) 3 . → Antiferromagnetism interactions. → Mossbauer spectroscopy. - Abstract: Crystal structures from two new phosphates Na 4 NiFe(PO 4 ) 3 (I) and Na 2 Ni 2 Fe(PO 4 ) 3 (II) have been determined by single crystal X-ray diffraction analysis. Compound (I) crystallizes in a rhombohedral system (S. G: R-3c, Z = 6, a = 8.7350(9) A, c = 21.643(4) A, R 1 = 0.041, wR 2 =0.120). Compound (II) crystallizes in a monoclinic system (S. G: C2/c, Z = 4, a = 11.729(7) A, b = 12.433(5) A, c = 6.431(2) A, β = 113.66(4) o , R 1 = 0.043, wR 2 =0.111). The three-dimensional structure of (I) is closely related to the Nasicon structural type, consisting of corner sharing [(Ni/Fe)O 6 ] octahedra and [PO 4 ] tetrahedra forming [NiFe(PO 4 ) 3 ] 4+ units which align in chains along the c-axis. The Na + cations fill up trigonal antiprismatic sites within these chains. The crystal structure of (II) belongs to the alluaudite type. Its open framework results from [Ni 2 O 10 ] units of edge-sharing [NiO 6 ] octahedra, which alternate with [FeO 6 ] octahedra that form infinite chains. Coordination of these chains yields two distinct tunnels in which site Na + . The magnetization data of compound (I) reveal antiferromagnetic (AFM) interactions by the onset of deviations from a Curie-Weiss behaviour at low temperature as confirmed by Moessbauer measurements performed at 4.2 K. The corresponding temperature dependence of the reciprocal susceptibility χ -1 follows a typical Curie-Weiss behaviour for T > 105 K. A canted AFM state is proposed for

  9. New saliva secretion model based on the expression of Na+-K+ pump and K+ channels in the apical membrane of parotid acinar cells.

    Science.gov (United States)

    Almássy, János; Siguenza, Elias; Skaliczki, Marianna; Matesz, Klara; Sneyd, James; Yule, David I; Nánási, Péter P

    2018-04-01

    The plasma membrane of parotid acinar cells is functionally divided into apical and basolateral regions. According to the current model, fluid secretion is driven by transepithelial ion gradient, which facilitates water movement by osmosis into the acinar lumen from the interstitium. The osmotic gradient is created by the apical Cl - efflux and the subsequent paracellular Na + transport. In this model, the Na + -K + pump is located exclusively in the basolateral membrane and has essential role in salivary secretion, since the driving force for Cl - transport via basolateral Na + -K + -2Cl - cotransport is generated by the Na + -K + pump. In addition, the continuous electrochemical gradient for Cl - flow during acinar cell stimulation is maintained by the basolateral K + efflux. However, using a combination of single-cell electrophysiology and Ca 2+ -imaging, we demonstrate that photolysis of Ca 2+ close to the apical membrane of parotid acinar cells triggered significant K + current, indicating that a substantial amount of K + is secreted into the lumen during stimulation. Nevertheless, the K + content of the primary saliva is relatively low, suggesting that K + might be reabsorbed through the apical membrane. Therefore, we investigated the localization of Na + -K + pumps in acinar cells. We show that the pumps appear evenly distributed throughout the whole plasma membrane, including the apical pole of the cell. Based on these results, a new mathematical model of salivary fluid secretion is presented, where the pump reabsorbs K + from and secretes Na + to the lumen, which can partially supplement the paracellular Na + pathway.

  10. A mixed iron-manganese based pyrophosphate cathode, Na2Fe0.5Mn0.5P2O7, for rechargeable sodium ion batteries.

    Science.gov (United States)

    Shakoor, Rana A; Park, Chan Sun; Raja, Arsalan A; Shin, Jaeho; Kahraman, Ramazan

    2016-02-07

    The development of secondary batteries based on abundant and cheap elements is vital. Among various alternatives to conventional lithium-ion batteries, sodium-ion batteries (SIBs) are promising due to the abundant resources and low cost of sodium. While there are many challenges associated with the SIB system, cathode is an important factor in determining the electrochemical performance of this battery system. Accordingly, ongoing research in the field of SIBs is inclined towards the development of safe, cost effective cathode materials having improved performance. In particular, pyrophosphate cathodes have recently demonstrated decent electrochemical performance and thermal stability. Herein, we report the synthesis, electrochemical properties, and thermal behavior of a novel Na2Fe0.5Mn0.5P2O7 cathode for SIBs. The material was synthesized through a solid state process. The structural analysis reveals that the mixed substitution of manganese and iron has resulted in a triclinic crystal structure (P1[combining macron] space group). Galvanostatic charge/discharge measurements indicate that Na2Fe0.5Mn0.5P2O7 is electrochemically active with a reversible capacity of ∼80 mA h g(-1) at a C/20 rate with an average redox potential of 3.2 V. (vs. Na/Na(+)). It is noticed that 84% of initial capacity is preserved over 90 cycles showing promising cyclability. It is also noticed that the rate capability of Na2Fe0.5Mn0.5P2O7 is better than Na2MnP2O7. Ex situ and CV analyses indicate that Na2Fe0.5Mn0.5P2O7 undergoes a single phase reaction rather than a biphasic reaction due to different Na coordination environment and different Na site occupancy when compared to other pyrophosphate materials (Na2FeP2O7 and Na2MnP2O7). Thermogravimetric analysis (25-550 °C) confirms good thermal stability of Na2Fe0.5Mn0.5P2O7 with only 2% weight loss. Owing to promising electrochemical properties and decent thermal stability, Na2Fe0.5Mn0.5P2O7, can be an attractive cathode for SIBs.

  11. Growth and characterization of lead-free (K,Na)NbO3-based piezoelectric single crystals

    International Nuclear Information System (INIS)

    Liu, Hairui

    2016-01-01

    Lead-free piezoelectric materials have received increasing attention in the last decade, driven by environmental issues and health concerns. Of considerable interest is the (K,Na)NbO 3 (KNN)-based system, which possesses a relatively high Curie temperature and good piezoelectric properties. Abundant publications on KNN-based polycrystalline ceramics increased the interest in studying their single-crystalline form, based on two major concerns. The first concern refers to the negative role of grain interactions on the electromechanical response. The second concern deals with domain engineering. The relationship between external electric field direction, crystallographic orientation, and spontaneous polarization vectors for a specific structure can be more readily established in single crystals and thus offers a pathway for an in-depth understanding of fundamental mechanism and potential applications. The exciting enhancement of both piezoelectric and ferroelectric response in lead-based single crystals also encourages the further exploration of KNN-based piezoelectric crystals, as they possess the same perovskite structure. The main goal of this thesis is to find possible approaches for improved electromechanical properties in KNN-based piezoelectric single crystals. In Chapter 2, the current development of KNN-based single crystals as piezoelectrics is reviewed, following a short introduction of fundamental knowledge on piezoelectrics and ferroelectrics. Both submerged-seed solution growth and top-seeded solution growth techniques were employed to produce single crystals, as described detailed in Chapter 3. Emphasis is subsequently placed on issues of the crystal growth process, effective methods to enhance electrical properties, and crystallographic orientation-dependent electrical properties in Li-, Ta-, and/or Sb-substituted KNN single crystals. The main conclusions from the crystal growth aspect are presented in Chapter 4 and can be summarized as follows: (i

  12. Growth and characterization of lead-free (K,Na)NbO{sub 3}-based piezoelectric single crystals

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Hairui

    2016-10-19

    Lead-free piezoelectric materials have received increasing attention in the last decade, driven by environmental issues and health concerns. Of considerable interest is the (K,Na)NbO{sub 3} (KNN)-based system, which possesses a relatively high Curie temperature and good piezoelectric properties. Abundant publications on KNN-based polycrystalline ceramics increased the interest in studying their single-crystalline form, based on two major concerns. The first concern refers to the negative role of grain interactions on the electromechanical response. The second concern deals with domain engineering. The relationship between external electric field direction, crystallographic orientation, and spontaneous polarization vectors for a specific structure can be more readily established in single crystals and thus offers a pathway for an in-depth understanding of fundamental mechanism and potential applications. The exciting enhancement of both piezoelectric and ferroelectric response in lead-based single crystals also encourages the further exploration of KNN-based piezoelectric crystals, as they possess the same perovskite structure. The main goal of this thesis is to find possible approaches for improved electromechanical properties in KNN-based piezoelectric single crystals. In Chapter 2, the current development of KNN-based single crystals as piezoelectrics is reviewed, following a short introduction of fundamental knowledge on piezoelectrics and ferroelectrics. Both submerged-seed solution growth and top-seeded solution growth techniques were employed to produce single crystals, as described detailed in Chapter 3. Emphasis is subsequently placed on issues of the crystal growth process, effective methods to enhance electrical properties, and crystallographic orientation-dependent electrical properties in Li-, Ta-, and/or Sb-substituted KNN single crystals. The main conclusions from the crystal growth aspect are presented in Chapter 4 and can be summarized as follows

  13. SU-F-J-06: Optimized Patient Inclusion for NaF PET Response-Based Biopsies

    Energy Technology Data Exchange (ETDEWEB)

    Roth, A; Harmon, S; Perk, T; Jeraj, R [University of Wisconsin, Madison, WI (United States)

    2016-06-15

    Purpose: A method to guide mid-treatment biopsies using quantitative [F-18]NaF PET/CT response is being investigated in a clinical trial. This study aims to develop methodology to identify patients amenable to mid-treatment biopsy based on pre-treatment imaging characteristics. Methods: 35 metastatic prostate cancer patients had NaF PET/CT scans taken prior to the start of treatment and 9–12 weeks into treatment. For mid-treatment biopsy targeting, lesions must be at least 1.5 cm{sup 3} and located in a clinically feasible region (lumbar/sacral spine, pelvis, humerus, or femur). Three methods were developed based on number of lesions present prior to treatment: a feasibility-restricted method, a location-restricted method, and an unrestricted method. The feasibility restricted method only utilizes information from lesions meeting biopsy requirements in the pre-treatment scan. The unrestricted method accounts for all lesions present in the pre-treatment scan. For each method, optimized classification cutoffs for candidate patients were determined. Results: 13 of the 35 patients had enough lesions at the mid-treatment for biopsy candidacy. Of 1749 lesions identified in all 35 patients at mid-treatment, only 9.8% were amenable to biopsy. Optimizing the feasibility-restricted method required 4 lesions at pre-treatment meeting volume and region requirements for biopsy, resulting patient identification sensitivity of 0.8 and specificity of 0.7. Of 6 false positive patients, only one patient lacked lesions for biopsy. Restricting for location alone showed poor results (sensitivity 0.2 and specificity 0.3). The optimized unrestricted method required patients have at least 37 lesions in pretreatment scan, resulting in a sensitivity of 0.8 and specificity of 0.8. There were 5 false positives, only one lacked lesions for biopsy. Conclusion: Incorporating the overall pre-treatment number of NaF PET/CT identified lesions provided best prediction for identifying candidate

  14. SU-F-J-06: Optimized Patient Inclusion for NaF PET Response-Based Biopsies

    International Nuclear Information System (INIS)

    Roth, A; Harmon, S; Perk, T; Jeraj, R

    2016-01-01

    Purpose: A method to guide mid-treatment biopsies using quantitative [F-18]NaF PET/CT response is being investigated in a clinical trial. This study aims to develop methodology to identify patients amenable to mid-treatment biopsy based on pre-treatment imaging characteristics. Methods: 35 metastatic prostate cancer patients had NaF PET/CT scans taken prior to the start of treatment and 9–12 weeks into treatment. For mid-treatment biopsy targeting, lesions must be at least 1.5 cm 3 and located in a clinically feasible region (lumbar/sacral spine, pelvis, humerus, or femur). Three methods were developed based on number of lesions present prior to treatment: a feasibility-restricted method, a location-restricted method, and an unrestricted method. The feasibility restricted method only utilizes information from lesions meeting biopsy requirements in the pre-treatment scan. The unrestricted method accounts for all lesions present in the pre-treatment scan. For each method, optimized classification cutoffs for candidate patients were determined. Results: 13 of the 35 patients had enough lesions at the mid-treatment for biopsy candidacy. Of 1749 lesions identified in all 35 patients at mid-treatment, only 9.8% were amenable to biopsy. Optimizing the feasibility-restricted method required 4 lesions at pre-treatment meeting volume and region requirements for biopsy, resulting patient identification sensitivity of 0.8 and specificity of 0.7. Of 6 false positive patients, only one patient lacked lesions for biopsy. Restricting for location alone showed poor results (sensitivity 0.2 and specificity 0.3). The optimized unrestricted method required patients have at least 37 lesions in pretreatment scan, resulting in a sensitivity of 0.8 and specificity of 0.8. There were 5 false positives, only one lacked lesions for biopsy. Conclusion: Incorporating the overall pre-treatment number of NaF PET/CT identified lesions provided best prediction for identifying candidate patients

  15. Magnetic zeolite NaA: synthesis, characterization based on metakaolin and its application for the removal of Cu2+, Pb2+.

    Science.gov (United States)

    Liu, Haibo; Peng, Shuchuan; Shu, Lin; Chen, Tianhu; Bao, Teng; Frost, Ray L

    2013-06-01

    The optimum parameters for synthesis of zeolite NaA based on metakaolin were investigated according to results of cation exchange capacity and static water adsorption of all synthesis products and selected X-ray diffraction (XRD). Magnetic zeolite NaA was synthesized by adding Fe3O4 in the precursor of zeolite. Zeolite NaA and magnetic zeolite NaA were characterized with scanning electron microscopy (SEM) and XRD. Magnetic zeolite NaA with different Fe3O4 loadings was prepared and used for removal of heavy metals (Cu(2+), Pb(2+)). The results show the optimum parameters for synthesis zeolite NaA are SiO2/Al2O3=2.3, Na2O/SiO2=1.4, H2O/Na2O=50, crystallization time 8h, crystallization temperature 95 °C. The addition of Fe3O4 makes the NaA zeolite with good magnetic susceptibility and good magnetic stability regardless of the Fe3O4 loading, confirming the considerable separation efficiency. Additionally, Fe3O4 loading had a little effect on removal of heavy metal by magnetic zeolite, however, the adsorption capacity still reaches 2.3 mmol g(-1) for Cu(2+), Pb(2+) with a removal efficiency of over 95% in spite of 4.7% Fe3O4 loading. This indicates magnetic zeolite can be used to remove metal heavy at least Cu(2+), Pb(2+) from water with metallic contaminants and can be separated easily after a magnetic process. Copyright © 2013 Elsevier Ltd. All rights reserved.

  16. Dielectric and piezoelectric properties of lead-free (Bi,Na)TiO3-based thin films

    Science.gov (United States)

    Abazari, M.; Safari, A.; Bharadwaja, S. S. N.; Trolier-McKinstry, S.

    2010-02-01

    Dielectric and piezoelectric properties of morphotropic phase boundary (Bi,Na)TiO3-(Bi,K)TiO3-BaTiO3 epitaxial thin films deposited on SrRuO3 coated SrTiO3 substrates were reported. Thin films of 350 nm thickness exhibited small signal dielectric permittivity and loss tangent values of 750 and 0.15, respectively, at 1 kHz. Ferroelectric hysteresis measurements indicated a remanent polarization value of 30 μC/cm2 with a coercive field of 85-100 kV/cm. The thin film transverse piezoelectric coefficient (e31,f) of these films after poling at 600 kV/cm was found to be -2.2 C/m2. The results indicate that these BNT-based thin films are a potential candidate for lead-free piezoelectric devices.

  17. Controle ácido-básico na hipotermia The acid-base management in hypothermia

    Directory of Open Access Journals (Sweden)

    Walter José Gomes

    1993-09-01

    Full Text Available O emprego da hipotermia profunda tem se constituído, atualmente, numa Importante estratégia para melhoria da qualidade técnica e resultados em cirurgia cardiovascular. A hipotermia reduz os danos teciduais induzidos pela isquemia por diminuir o metabolismo e preservar os fosfatos energéticos. A regulação do pH tecidual durante a hipotermia é fundamental para a manutenção da homeostasia celular, já que a hipotermia induz alterações desse pH pela mudança provocada na constante de dissociação da água. A questão do melhor manuseio dos gases sangüíneos durante a hipotermia induzida tem sido objeto de controvérsia. Duas abordagens têm sido preconizadas para o manejo das alterações iónicas durante a hipotermia. A regulção pH-stat envolve a manutenção do pH constante de 7,40 em todas as temperaturas com ajustes da PaCO2 e a regulação α-stat permite a variação do pH sangüíneo, que aumenta conforme a diminuição da temperatura e o conteúdo total corpóreo de CO2 é mantido constante. Nesta presente revisão a relação entre pH sangüíneo e intracelular e as alterações iónicas induzidas pela hipotermia são discutidas.Deep hypothermia is a usefull tool to improve technical results in cardiovascular surgery and is nowadays the major strategy used to reduce ischemic injury. Hypothermia reduces metabolism and preserves cellular stores of high-energy phosphates. The regulation of tissue pH during hypothermia is important for cellular homeostasis. Furthermore, hypothermia has important effects on pH by altering the dissociation constant of water and various metabolics intermediates and the question of optimal blood gas management during deliberate hypothermia has been subject of much controversy. Two approaches have been advocated for pH management during hypothermia, the first termed pH strategy, where blood pH is maintained constant at 7,40 at all temperatures with PaCO2 adjustment, and in the second type of

  18. Utilização de subprodutos de origem animal em dietas formuladas com base em proteína bruta e proteína ideal para frangos de corte de 1 a 21 dias de idade Use of animal by-products in diets formulated based on crude and ideal protein fed to broiler from 1 to 21 days of age

    Directory of Open Access Journals (Sweden)

    Luciana Cardoso Cancherini

    2005-04-01

    Full Text Available Foi conduzido um experimento para avaliar a utilização de subprodutos de origem animal em dietas para frangos de corte, formuladas com base na proteína bruta ou proteína ideal. O delineamento foi inteiramente casualizado em esquema fatorial 2x2+1, com duas fontes de proteína de origem animal (farinha de vísceras de aves e farinha de sangue bovino, dois conceitos de formulação (proteína bruta e proteína ideal e uma dieta testemunha à base de milho e farelo de soja, com quatro repetições. As características avaliadas foram ganho de peso, consumo de ração e conversão alimentar. Houve efeito significativo das interações entre fontes de proteína de origem animal e conceitos de formulação para consumo de ração e ganho de peso. Quanto à conversão alimentar, não houve diferença significativa na interação e os melhores valores de conversão alimentar foram encontrados quando se incorporou a farinha de vísceras às dietas. Os melhores ganhos de peso foram obtidos com as dietas com farinha de sangue formuladas com base na proteína bruta e com farinha de vísceras de aves com base na proteína ideal.An experiment was conducted to evaluate the use of animal by-products in broiler diets, formulated based on crude and ideal protein. The experimental design was a completely randomized in a factorial arrangement 2x2+1, with two animal protein sources (poultry viscera meal and bovine blood meal, two formulation concepts (based on crude and ideal protein and a control diet based on corn and soybean meal, with four replications. The evaluated characteristics were weight gain, feed intake and feed: gain ratio. There was a significant effect of the interaction animal protein source x formulation concepts on feed intake and weight gain. There was not significant effect of the interaction on feed: gain ratio and the best values were found when the poultry viscera meal was added to the diets. The best weight gains were obtained with the

  19. Integrating Entropy-Based Naïve Bayes and GIS for Spatial Evaluation of Flood Hazard.

    Science.gov (United States)

    Liu, Rui; Chen, Yun; Wu, Jianping; Gao, Lei; Barrett, Damian; Xu, Tingbao; Li, Xiaojuan; Li, Linyi; Huang, Chang; Yu, Jia

    2017-04-01

    Regional flood risk caused by intensive rainfall under extreme climate conditions has increasingly attracted global attention. Mapping and evaluation of flood hazard are vital parts in flood risk assessment. This study develops an integrated framework for estimating spatial likelihood of flood hazard by coupling weighted naïve Bayes (WNB), geographic information system, and remote sensing. The north part of Fitzroy River Basin in Queensland, Australia, was selected as a case study site. The environmental indices, including extreme rainfall, evapotranspiration, net-water index, soil water retention, elevation, slope, drainage proximity, and density, were generated from spatial data representing climate, soil, vegetation, hydrology, and topography. These indices were weighted using the statistics-based entropy method. The weighted indices were input into the WNB-based model to delineate a regional flood risk map that indicates the likelihood of flood occurrence. The resultant map was validated by the maximum inundation extent extracted from moderate resolution imaging spectroradiometer (MODIS) imagery. The evaluation results, including mapping and evaluation of the distribution of flood hazard, are helpful in guiding flood inundation disaster responses for the region. The novel approach presented consists of weighted grid data, image-based sampling and validation, cell-by-cell probability inferring and spatial mapping. It is superior to an existing spatial naive Bayes (NB) method for regional flood hazard assessment. It can also be extended to other likelihood-related environmental hazard studies. © 2016 Society for Risk Analysis.

  20. Fabrication of high responsivity deep UV photo-detector based on Na doped ZnO nanocolumns

    Science.gov (United States)

    Agrawal, Jitesh; Dixit, Tejendra; Palani, I. A.; Ramachandra Rao, M. S.; Singh, Vipul

    2018-05-01

    We report a variety of the hydrothermally synthesized ZnO nanostructures with a significant suppression in defect-related emission and huge enhancement in the photo-current to the dark current ratio (approximately six orders of magnitude) upon UV light illumination. Interestingly, the photo-detector shows lower dark current of 1.6 nA with high responsivity of 507 A W‑1 at 254 nm. Here, a systematic analysis of the growth process as well as the physical, chemical and electrical properties of as-grown ZnO nanostructures has been performed. We have utilized the duo effect of both the inorganic (KMnO4) and organic (Na3C6H5O7) additives, which has facilitated the precise tuning of the morphology and intrinsic defects in nanostructures that have made an impact on the photo-responsivity, photoluminescence (PL) and adhesivity of the film on to the underlying substrate. PL analysis of as-grown ZnO nanostructures has suggested 11 times improvement in the near band emission (NBE) to defect level emission (DLE) ratio. Interestingly, thermal annealing of the samples has shown a dramatic change in the morphology with significant improvement in the crystallinity. Notably, the band gap was observed to be modulated from 3.3 eV to 3.1 eV after annealing. In addition to UV photo-detector based applications, the work presented here has provided a subtle solution towards the rectification of various problems pertaining to hydrothermal processes like poor adhesivity, feeble UV emission and problem in precise tuning of the morphology along with the bandgap in one go. Therefore, these investigations assume critical significance towards the development of next-generation optoelectronic devices.

  1. Acid-base behavior of the gaspeite (NiCO3(s)) surface in NaCl solutions.

    Science.gov (United States)

    Villegas-Jiménez, Adrián; Mucci, Alfonso; Pokrovsky, Oleg S; Schott, Jacques

    2010-08-03

    Gaspeite is a low reactivity, rhombohedral carbonate mineral and a suitable surrogate to investigate the surface properties of other more ubiquitous carbonate minerals, such as calcite, in aqueous solutions. In this study, the acid-base properties of the gaspeite surface were investigated over a pH range of 5 to 10 in NaCl solutions (0.001, 0.01, and 0.1 M) at near ambient conditions (25 +/- 3 degrees C and 1 atm) by means of conventional acidimetric and alkalimetric titration techniques and microelectrophoresis. Over the entire experimental pH range, surface protonation and electrokinetic mobility are strongly affected by the background electrolyte, leading to a significant decrease of the pH of zero net proton charge (PZNPC) and the pH of isoelectric point (pH(iep)) at increasing NaCl concentrations. This challenges the conventional idea that carbonate mineral surfaces are chemically inert to background electrolyte ions. Multiple sets of surface complexation reactions (i.e., ionization and ion adsorption) were formulated within the framework of three electrostatic models (CCM, BSM, and TLM) and their ability to simulate proton adsorption and electrokinetic data was evaluated. A one-site, 3-pK, constant capacitance surface complexation model (SCM) reproduces the proton adsorption data at all ionic strengths and qualitatively predicts the electrokinetic behavior of gaspeite suspensions. Nevertheless, the strong ionic strength dependence exhibited by the optimized SCM parameters reveals that the influence of the background electrolyte on the surface reactivity of gaspeite is not fully accounted for by conventional electrostatic and surface complexation models and suggests that future refinements to the underlying theories are warranted.

  2. Network Intrusion Detection System (NIDS in Cloud Environment based on Hidden Naïve Bayes Multiclass Classifier

    Directory of Open Access Journals (Sweden)

    Hafza A. Mahmood

    2018-04-01

    Full Text Available Cloud Environment is next generation internet based computing system that supplies customiza-ble services to the end user to work or access to the various cloud applications. In order to provide security and decrease the damage of information system, network and computer system it is im-portant to provide intrusion detection system (IDS. Now Cloud environment are under threads from network intrusions, as one of most prevalent and offensive means Denial of Service (DoS attacks that cause dangerous impact on cloud computing systems. This paper propose Hidden naïve Bayes (HNB Classifier to handle DoS attacks which is a data mining (DM model used to relaxes the conditional independence assumption of Naïve Bayes classifier (NB, proposed sys-tem used HNB Classifier supported with discretization and feature selection where select the best feature enhance the performance of the system and reduce consuming time. To evaluate the per-formance of proposal system, KDD 99 CUP and NSL KDD Datasets has been used. The experi-mental results show that the HNB classifier improves the performance of NIDS in terms of accu-racy and detecting DoS attacks, where the accuracy of detect DoS is 100% in three test KDD cup 99 dataset by used only 12 feature that selected by use gain ratio while in NSL KDD Dataset the accuracy of detect DoS attack is 90 % in three Experimental NSL KDD dataset by select 10 fea-ture only.

  3. Symmetric Sodium-Ion Capacitor Based on Na0.44MnO2 Nanorods for Low-Cost and High-Performance Energy Storage.

    Science.gov (United States)

    Chen, Zhongxue; Yuan, Tianci; Pu, Xiangjun; Yang, Hanxi; Ai, Xinping; Xia, Yongyao; Cao, Yuliang

    2018-04-11

    Batteries and electrochemical capacitors play very important roles in the portable electronic devices and electric vehicles and have shown promising potential for large-scale energy storage applications. However, batteries or capacitors alone cannot meet the energy and power density requirements because rechargeable batteries have a poor power property, whereas supercapacitors offer limited capacity. Here, a novel symmetric sodium-ion capacitor (NIC) is developed based on low-cost Na 0.44 MnO 2 nanorods. The Na 0.44 MnO 2 with unique nanoarchitectures and iso-oriented feature offers shortened diffusion path lengths for both electronic and Na + transport and reduces the stress associated with Na + insertion and extraction. Benefiting from these merits, the symmetric device achieves a high power density of 2432.7 W kg -1 , an improved energy density of 27.9 Wh kg -1 , and a capacitance retention of 85.2% over 5000 cycles. Particularly, the symmetric NIC based on Na 0.44 MnO 2 permits repeatedly reverse-polarity characteristics, thus simplifying energy management system and greatly enhancing the safety under abuse condition. This cost-effective, high-safety, and high-performance symmetric NIC can balance the energy and power density between batteries and capacitors and serve as an electric power source for future low-maintenance large-scale energy storage systems.

  4. Implementation of a laboratory apparatus based on a NaI(Tl) spectrometer: application to the characterization of soil radioactivity

    International Nuclear Information System (INIS)

    Andrianjafitrimo

    2001-01-01

    A laboratory apparatus based on a NaI(Tl) γ-ray spectrometer for the assessment of radionuclides naturally occurring in environmental samples was established. This detection system is devoted to the quantitative determination of uranium, thorium and potassium in soils and rocks samples.The IAEA reference materials, RG S ET was used for calibration of the spectrometer. The photopics at 1460, 1765 and 2614 keV due to 40 K, 238 U and 232 Th, respectively, were used for the corresponding activity measurements. The radioactivity characterization of soils was performed on primordial radionuclides distribution and radon emanation according to the grain-size. Because of social and economical interest that present the collected samples (mineralized sands and soils rich in uranium), their radiation protection aspects was considered in this work. Discussions was made on factors restricting the approach based on scintillation spectrometry, such as radioactive equilibrium and radon encapsulation in the one hand, and in the other hand, on the assessment of soils characterization, among other things, grain-size effects. The present work has also shown that radioactivity levels of building and fabrication materials can be reduced by the removal of fines or fraction having higher concentrations by sieving. [fr

  5. Latest research results on the effects of nanomaterials on humans and the environment: DaNa – Knowledge Base Nanomaterials

    International Nuclear Information System (INIS)

    Marquardt, C; Nau, K; Kühnel, D; Richter, V; Krug, H F; Mathes, B; Steinbach, C

    2013-01-01

    Nanotechnology is considered one of the key technologies of the 21st century. The success of this fascinating technology is based on its versatility. It will bring about fundamental changes of basic research as well as of many sectors of industry and also of daily life from electronics to the health care system. However, consumers often miss reliable and understandable information on nanomaterials and all aspects of this versatile technology. A huge body of data on the potential hazards of nanoobjects towards human and environmental health already exists, but is either not easily accessible for a broad audience or presented unprocessable for nonexperts. But risk communication is an essential and thus integral component of risk management. For that purpose, the DaNa-Project aims at filling this gap by collecting and evaluating scientific results in an interdisciplinary approach with scientists from different research areas, such as human and environmental toxicology, biology, physics, chemistry, and sociology. Research findings from the field of human and environmental nanotoxicology are being prepared and presented together with material properties and possible applications for interested laymen and stakeholders. For the evaluation of literature a 'Literature Criteria Checklist' has been developed as well as a Standard Operation Procedure template (SOP) based on careful scientific practice.

  6. Corrosion resistance of zinc-based systems in NaCl environment

    Directory of Open Access Journals (Sweden)

    Jiří Votava

    2013-01-01

    Full Text Available Metal components in engineering, industry and agriculture are subjects of degradation process influenced by corrosion which result in changes of mechanical characteristics. The current trend of anticorrosion protection is aimed at inorganic metal zinc-based coatings, such as zinc dipping which can be improved by duplex protection. This paper deals with two types of corrosion protection of steel components by zinc coating, first of which is produced by hot dip galvanizing, the other by Zn-Al spray. Hot dip galvanizing was processed in working conditions; the Zn-Al coating was sprayed following the instructions of producer. It is a special aerosol with particles of Zn and Al sized approximately 5 µm. There have been processed the following tests: analysis of element structure, test of corrosion resistance in aggressive environment of salt spray according to ČSN ISO 9227, further measurement weight of applied coatings according to ČSN EN ISO 3892 and measurement of thickness of passivating coating. There was also made an analysis of coating tenacity on bending pin according to ČSN EN ISO 8401. Quality of applied coatings was evaluated following the metallographic scratch pattern.

  7. R2NA: Received Signal Strength (RSS Ratio-Based Node Authentication for Body Area Network

    Directory of Open Access Journals (Sweden)

    Yang Wu

    2013-12-01

    Full Text Available The body area network (BAN is an emerging branch of wireless sensor networks for personalized applications. The services in BAN usually have a high requirement on security, especially for the medical diagnosis. One of the fundamental directions to ensure security in BAN is how to provide node authentication. Traditional research using cryptography relies on prior secrets shared among nodes, which leads to high resource cost. In addition, most existing non-cryptographic solutions exploit out-of-band (OOB channels, but they need the help of additional hardware support or significant modifications to the system software. To avoid the above problems, this paper presents a proximity-based node authentication scheme, which only uses wireless modules equipped on sensors. With only one sensor and one control unit (CU in BAN, we could detect a unique physical layer characteristic, namely, the difference between the received signal strength (RSS measured on different devices in BAN. Through the above-mentioned particular difference, we can tell whether the sender is close enough to be legitimate. We validate our scheme through both theoretical analysis and experiments, which are conducted on the real Shimmer nodes. The results demonstrate that our proposed scheme has a good security performance.

  8. Crystal structures and magnetic properties of iron (III)-based phosphates: Na{sub 4}NiFe(PO{sub 4}){sub 3} and Na{sub 2}Ni{sub 2}Fe(PO{sub 4}){sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    Essehli, Rachid, E-mail: rachid_essehli@yahoo.fr [Laboratory of Mineral Solid and Analytical Chemistry ' LCSMA' , Department of Chemistry, Faculty of Sciences, University Mohamed I, Po. Box 717, 60000 Oujda (Morocco); Bali, Brahim El [Laboratory of Mineral Solid and Analytical Chemistry ' LCSMA' , Department of Chemistry, Faculty of Sciences, University Mohamed I, Po. Box 717, 60000 Oujda (Morocco); Benmokhtar, Said [LCMS, Laboratoire de Chimie des Materiaux Solides, Departement de chimie, Faculte des Sciences Ben M' SIK, Casablanca (Morocco); Bouziane, Khalid [Physics Department, College of Science, Sultan Qaboos University, PO Box 36, Postal Code 123 Al Khod, Sultanate of Oman (Oman); Manoun, Bouchaib [Laboratoire de Physico-Chimie des Materiaux, Departement de Chimie, FST Errachidia, University Moulay Ismail, B.P. 509 Boutalamine, Errachidia (Morocco); Abdalslam, Mouner Ahmed [Materials Science, Technical University Darmstadt, Darmstadt (Germany); Ehrenberg, Helmut [IFW Dresden, Helmholtzstr. 20, D-01069 Dresden (Germany)

    2011-01-28

    Graphical abstract: A perspective view of the Na{sub 2}Ni{sub 2}Fe(PO{sub 4}){sub 3} structure along the [0 0 1] direction. Both compounds seem to exibit antiferromagnetic interactions between magnetic entities at low temperature. Display Omitted Research highlights: > Nasicon and Alluaudite compounds, Iron(III)-based phosphates, Crystal structures of Na{sub 4}NiFe(PO{sub 4}){sub 3} and Na{sub 2}Ni{sub 2}Fe(PO{sub 4}){sub 3}. > Magnetism behaviours of Na{sub 4}NiFe(PO{sub 4}){sub 3} and Na{sub 2}Ni{sub 2}Fe(PO{sub 4}){sub 3}. > Antiferromagnetism interactions. > Mossbauer spectroscopy. - Abstract: Crystal structures from two new phosphates Na{sub 4}NiFe(PO{sub 4}){sub 3} (I) and Na{sub 2}Ni{sub 2}Fe(PO{sub 4}){sub 3} (II) have been determined by single crystal X-ray diffraction analysis. Compound (I) crystallizes in a rhombohedral system (S. G: R-3c, Z = 6, a = 8.7350(9) A, c = 21.643(4) A, R{sub 1} = 0.041, wR{sub 2}=0.120). Compound (II) crystallizes in a monoclinic system (S. G: C2/c, Z = 4, a = 11.729(7) A, b = 12.433(5) A, c = 6.431(2) A, {beta} = 113.66(4){sup o}, R{sub 1} = 0.043, wR{sub 2}=0.111). The three-dimensional structure of (I) is closely related to the Nasicon structural type, consisting of corner sharing [(Ni/Fe)O{sub 6}] octahedra and [PO{sub 4}] tetrahedra forming [NiFe(PO{sub 4}){sub 3}]{sup 4+} units which align in chains along the c-axis. The Na{sup +} cations fill up trigonal antiprismatic sites within these chains. The crystal structure of (II) belongs to the alluaudite type. Its open framework results from [Ni{sub 2}O{sub 10}] units of edge-sharing [NiO{sub 6}] octahedra, which alternate with [FeO{sub 6}] octahedra that form infinite chains. Coordination of these chains yields two distinct tunnels in which site Na{sup +}. The magnetization data of compound (I) reveal antiferromagnetic (AFM) interactions by the onset of deviations from a Curie-Weiss behaviour at low temperature as confirmed by Moessbauer measurements performed at 4.2 K. The

  9. Multicolor light emitters based on energy exchange between Tb and Eu ions co-doped into ultrasmall β-NaYF 4 nanocrystals

    KAUST Repository

    Podhorodecki, Artur P.; Bański, Mateusz; Misiewicz, Jan J.; Afzaal, Mohammad; O'Brien, Paul J.; Cha, Dong Kyu; Wang, Xianbin

    2012-01-01

    based on the experimental results and calculations using Judd-Ofelt theory. It has been shown that efficient energy transfer from Tb to Eu ions accounts for the efficient red emission of NaYF4:Tb,Eu nanocrystals. © The Royal Society of Chemistry 2012.

  10. Predicción del contenido de aminoácidos en el trigo con base en su valor de proteína

    OpenAIRE

    Cervantes, Miguel; Copado, Fernando; Cervantes, Maximiliano; Soto, Roberto; Torrentera, Noemí; Figueroa, José Luis

    2002-01-01

    Resumen Se analizó la composición de aminoácidos en trigos producidos comercialmente, y se generaron modelos para predecir el contenido de aminoácidos con base en el contenido de proteína cruda en este cereal. Se colectaron 150 muestras del cereal de la cosecha del 2001, las cuales se agruparon en tres lotes (alto, medio y bajo) de acuerdo con su porcentaje de proteína cruda. De cada grupo se tomaron 9 muestras en que se analizó el contenido de aminoácidos. Se realizaron análisis de correlaci...

  11. Compositional Design of Dielectric, Ferroelectric and Piezoelectric Properties of (K, Na)NbO₃ and (Ba, Na)(Ti, Nb)O₃ Based Ceramics Prepared by Different Sintering Routes.

    Science.gov (United States)

    Eiras, José A; Gerbasi, Rosimeire B Z; Rosso, Jaciele M; Silva, Daniel M; Cótica, Luiz F; Santos, Ivair A; Souza, Camila A; Lente, Manuel H

    2016-03-08

    Lead free piezoelectric materials are being intensively investigated in order to substitute lead based ones, commonly used in many different applications. Among the most promising lead-free materials are those with modified NaNbO₃, such as (K, Na)NbO₃ (KNN) and (Ba, Na)(Ti, Nb)O₃ (BTNN) families. From a ceramic processing point of view, high density single phase KNN and BTNN ceramics are very difficult to sinter due to the volatility of the alkaline elements, the narrow sintering temperature range and the anomalous grain growth. In this work, Spark Plasma Sintering (SPS) and high-energy ball milling (HEBM), following heat treatments (calcining and sintering), in oxidative (O₂) atmosphere have been used to prepare single phase highly densified KNN ("pure" and Cu 2+ or Li 1+ doped), with theoretical densities ρ th > 97% and BTNN ceramics (ρ th - 90%), respectively. Using BTTN ceramics with a P 4 mm perovskite-like structure, we showed that by increasing the NaNbO₃ content, the ferroelectric properties change from having a relaxor effect to an almost "normal" ferroelectric character, while the tetragonality and grain size increase and the shear piezoelectric coefficients ( k 15 , g 15 and d 15 ) improve. For KNN ceramics, the results reveal that the values for remanent polarization as well as for most of the coercive field are quite similar among all compositions. These facts evidenced that Cu 2+ may be incorporated into the A and/or B sites of the perovskite structure, having both hardening and softening effects.

  12. Compositional Design of Dielectric, Ferroelectric and Piezoelectric Properties of (K, NaNbO3 and (Ba, Na(Ti, NbO3 Based Ceramics Prepared by Different Sintering Routes

    Directory of Open Access Journals (Sweden)

    José A. Eiras

    2016-03-01

    Full Text Available Lead free piezoelectric materials are being intensively investigated in order to substitute lead based ones, commonly used in many different applications. Among the most promising lead-free materials are those with modified NaNbO3, such as (K, NaNbO3 (KNN and (Ba, Na(Ti, NbO3 (BTNN families. From a ceramic processing point of view, high density single phase KNN and BTNN ceramics are very difficult to sinter due to the volatility of the alkaline elements, the narrow sintering temperature range and the anomalous grain growth. In this work, Spark Plasma Sintering (SPS and high-energy ball milling (HEBM, following heat treatments (calcining and sintering, in oxidative (O2 atmosphere have been used to prepare single phase highly densified KNN (“pure” and Cu2+ or Li1+ doped, with theoretical densities ρth > 97% and BTNN ceramics (ρth - 90%, respectively. Using BTTN ceramics with a P4mm perovskite-like structure, we showed that by increasing the NaNbO3 content, the ferroelectric properties change from having a relaxor effect to an almost “normal” ferroelectric character, while the tetragonality and grain size increase and the shear piezoelectric coefficients (k15, g15 and d15 improve. For KNN ceramics, the results reveal that the values for remanent polarization as well as for most of the coercive field are quite similar among all compositions. These facts evidenced that Cu2+ may be incorporated into the A and/or B sites of the perovskite structure, having both hardening and softening effects.

  13. Compositional Design of Dielectric, Ferroelectric and Piezoelectric Properties of (K, Na)NbO3 and (Ba, Na)(Ti, Nb)O3 Based Ceramics Prepared by Different Sintering Routes

    Science.gov (United States)

    Eiras, José A.; Gerbasi, Rosimeire B. Z.; Rosso, Jaciele M.; Silva, Daniel M.; Cótica, Luiz F.; Santos, Ivair A.; Souza, Camila A.; Lente, Manuel H.

    2016-01-01

    Lead free piezoelectric materials are being intensively investigated in order to substitute lead based ones, commonly used in many different applications. Among the most promising lead-free materials are those with modified NaNbO3, such as (K, Na)NbO3 (KNN) and (Ba, Na)(Ti, Nb)O3 (BTNN) families. From a ceramic processing point of view, high density single phase KNN and BTNN ceramics are very difficult to sinter due to the volatility of the alkaline elements, the narrow sintering temperature range and the anomalous grain growth. In this work, Spark Plasma Sintering (SPS) and high-energy ball milling (HEBM), following heat treatments (calcining and sintering), in oxidative (O2) atmosphere have been used to prepare single phase highly densified KNN (“pure” and Cu2+ or Li1+ doped), with theoretical densities ρth > 97% and BTNN ceramics (ρth ~ 90%), respectively. Using BTTN ceramics with a P4mm perovskite-like structure, we showed that by increasing the NaNbO3 content, the ferroelectric properties change from having a relaxor effect to an almost “normal” ferroelectric character, while the tetragonality and grain size increase and the shear piezoelectric coefficients (k15, g15 and d15) improve. For KNN ceramics, the results reveal that the values for remanent polarization as well as for most of the coercive field are quite similar among all compositions. These facts evidenced that Cu2+ may be incorporated into the A and/or B sites of the perovskite structure, having both hardening and softening effects. PMID:28773304

  14. A high-resolution TDC-based board for a fully digital trigger and data acquisition system in the NA62 experiment at CERN

    CERN Document Server

    Pedreschi, Elena; Angelucci, Bruno; Avanzini, Carlo; Galeotti, Stefano; Lamanna, Gianluca; Magazzù, Guido; Pinzino, Jacopo; Piandani, Roberto; Sozzi, Marco; Spinella, Franco; Venditti, Stefano

    2015-01-01

    A Time to Digital Converter (TDC) based system, to be used for most sub-detectors in the high-flux rare-decay experiment NA62 at CERN SPS, was built as part of the NA62 fully digital Trigger and Data AcQuisition system (TDAQ), in which the TDC Board (TDCB) and a general-purpose motherboard (TEL62) will play a fundamental role. While TDCBs, housing four High Performance Time to Digital Converters (HPTDC), measure hit times from sub-detectors, the motherboard processes and stores them in a buffer, produces trigger primitives from different detectors and extracts only data related to the lowest trigger level decision, once this is taken on the basis of the trigger primitives themselves. The features of the TDCB board developed by the Pisa NA62 group are extensively discussed and performance data is presented in order to show its compliance with the experiment requirements.

  15. Diets based on soybean protein for Mediterranean fruit fly Dietas baseadas em proteína de soja para moscas do Mediterrâneo

    Directory of Open Access Journals (Sweden)

    Raimundo Braga Sobrinho

    2006-04-01

    Full Text Available The objective of this work was to develop suitable and economic diets for mass rearing Mediterranean fruit fly, Ceratitis capitata (Diptera: Tephritidae. Diets containing sugar beet bagase, wheat bran, brewer yeast, and others with wheat bran and palletized soybean protein from Brazil were tested. Diets based on soybean protein have shown promising results regarding pupal recovery, pupal weight and adult emergence. Soybean bagase in the form of pellets with 60% of protein can be a very important substitute for other expensive sources of protein.O objetivo deste trabalho foi desenvolver dietas adequadas e econômicas para a criação massal de moscas de frutas do Mediterrâneo, Ceratitis capitata (Diptera: Tephritidae. Foram testados dietas com bagaço de beterraba açucareira, farelo de trigo, levedura de cerveja e outras dietas de farelo de trigo e proteína de soja prensada brasileira. Dietas compostas por proteína de soja apresentaram resultados positivos de recuperação de pupas, pesos de pupa e emergência de adultos. O bagaço de soja, na forma de pellet com 60% de proteína, pode ser um importante substituto de outras fontes de proteína.

  16. Waste crab shell derived CaO impregnated Na-ZSM-5 as a solid base catalyst for the transesterification of neem oil into biodiesel

    Directory of Open Access Journals (Sweden)

    Vijayalakshmi Shankar

    2017-11-01

    Full Text Available Activated calcium oxide extracted from crab shell impregnated on Na-ZSM-5 has been investigated. Crab shells were collected, powdered and calcined at 900 °C, and CaO was impregnated on Na-ZSM-5 and calcined at 550 °C for 10 h. The CaO/Na-ZSM-5 was characterized by X-ray diffraction, scanning electron microscopy and BET surface area. The prepared catalyst was tested for its catalytic activity by transesterifing neem oil into biodiesel in the presence of methanol. The influence of various parameters including reaction time, temperature, methanol to oil ratio, catalyst concentration and dosage were also investigated. Produced biodiesel have also been tested using proton NMR spectroscopy. Biodiesel yield as 95% has been achieved with 15% CaO impregnated on Na-ZSM-5 at 75 °C. The optimum transesterification reaction conditions were identified as follows: reaction temperature, 75 °C; reaction time, 6 h; methanol-to-neem oil molar ratio, 12:1; catalyst dosage, 0.2 g; and catalyst concentration, 15%. Based on the above study, it can be concluded that the calcium oxide impregnated Na-ZSM-5 can be a potential catalyst for biodiesel production.

  17. Water-stable NaLuF4-based upconversion nanophosphors with long-term validity for multimodal lymphatic imaging.

    Science.gov (United States)

    Zhou, Jing; Zhu, Xingjun; Chen, Min; Sun, Yun; Li, Fuyou

    2012-09-01

    Multimodal imaging is rapidly becoming an important tool for biomedical applications because it can compensate for the deficiencies of individual imaging modalities. Herein, multifunctional NaLuF(4)-based upconversion nanoparticles (Lu-UCNPs) were synthesized though a facile one-step microemulsion method under ambient condition. The doping of lanthanide ions (Gd(3+), Yb(3+) and Er(3+)/Tm(3+)) endows the Lu-UCNPs with high T(1)-enhancement, bright upconversion luminescence (UCL) emissions, and excellent X-ray absorption coefficient. Moreover, the as-prepared Lu-UCNPs are stable in water for more than six months, due to the protection of sodium glutamate and diethylene triamine pentacetate acid (DTPA) coordinating ligands on the surface. Lu-UCNPs have been successfully applied to the trimodal CT/MR/UCL lymphatic imaging on the modal of small animals. It is worth noting that Lu-UCNPs could be used for imaging even after preserving for over six months. In vitro transmission electron microscope (TEM), methyl thiazolyl tetrazolium (MTT) assay and histological analysis demonstrated that Lu-UCNPs exhibited low toxicity on living systems. Therefore, Lu-UCNPs could be multimodal agents for CT/MR/UCL imaging, and the concept can be served as a platform technology for the next-generation of probes for multimodal imaging. Copyright © 2012 Elsevier Ltd. All rights reserved.

  18. A density model based on the Modified Quasichemical Model and applied to the (NaCl + KCl + ZnCl2) liquid

    International Nuclear Information System (INIS)

    Ouzilleau, Philippe; Robelin, Christian; Chartrand, Patrice

    2012-01-01

    Highlights: ► A model for the density of multicomponent inorganic liquids. ► The density model is based on the Modified Quasichemical Model. ► Application to the (NaCl + KCl + ZnCl 2 ) ternary liquid. ► A Kohler–Toop-like asymmetric interpolation method was used. - Abstract: A theoretical model for the density of multicomponent inorganic liquids based on the Modified Quasichemical Model has been presented previously. By introducing in the Gibbs free energy of the liquid phase temperature-dependent molar volume expressions for the pure components and pressure-dependent excess parameters for the binary (and sometimes higher-order) interactions, it is possible to reproduce, and eventually predict, the molar volume and the density of the multicomponent liquid phase using standard interpolation methods. In the present article, this density model is applied to the (NaCl + KCl + ZnCl 2 ) ternary liquid and a Kohler–Toop-like asymmetric interpolation method is used. All available density data for the (NaCl + KCl + ZnCl 2 ) liquid were collected and critically evaluated, and optimized pressure-dependent model parameters have been found. This new volumetric model can be used with Gibbs free energy minimization software, to calculate the molar volume and the density of (NaCl + KCl + ZnCl 2 ) ternary melts.

  19. Domain configuration changes under electric field-induced antiferroelectric-ferroelectric phase transitions in NaNbO3-based ceramics

    International Nuclear Information System (INIS)

    Guo, Hanzheng; Randall, Clive A.; Shimizu, Hiroyuki; Mizuno, Youichi

    2015-01-01

    We recently developed a feasible crystal chemistry strategy to stabilize the antiferroelectricity in NaNbO 3 through a chemical substitution to decrease the tolerance factor and increase the average electronegativity of the system [Shimizu et al., Dalton Trans. 44, 10763 (2015) and Guo et al., J. Appl. Phys. 117, 214103 (2015)]. Two novel lead-free antiferroelectric (AFE) solid solutions, (1-x)NaNbO 3 -xCaZrO 3 and (1-x)NaNbO 3 -xSrZrO 3 , have been found to exhibit the double polarization hysteresis typical of a reversible AFE ↔ ferroelectric (FE) phase transition. In this study, as demonstrated by (1-x)NaNbO 3 -xCaZrO 3 system, the influence of chemical modification and electrical poling on the AFE/FE phase stability was investigated, primarily focusing on the microstructural and crystallographic evolutions. Together with the macroscopic polarization hysteresis measurements, a well-demonstrated structure-property relationship was presented. It was found that the CaZrO 3 substitution into NaNbO 3 can effectively destabilize the FE Q phase and correspondingly lead to a spontaneous reverting to AFE P phase. In contrast to the reversible AFE ↔ FE phase transition, the domain morphology evolution exhibits irreversible nature with a growing process of the orientational domains after applying electric field. Moreover, a multiple-zone axes electron diffraction map of P and Q phases has been summarized and is believed to be an efficient diagram to determine the AFE/FE nature of the NaNbO 3 -based systems

  20. High-Performance 2.6 V Aqueous Asymmetric Supercapacitors based on In Situ Formed Na0.5 MnO2 Nanosheet Assembled Nanowall Arrays.

    Science.gov (United States)

    Jabeen, Nawishta; Hussain, Ahmad; Xia, Qiuying; Sun, Shuo; Zhu, Junwu; Xia, Hui

    2017-08-01

    The voltage limit for aqueous asymmetric supercapacitors is usually 2 V, which impedes further improvement in energy density. Here, high Na content Birnessite Na 0.5 MnO 2 nanosheet assembled nanowall arrays are in situ formed on carbon cloth via electrochemical oxidation. It is interesting to find that the electrode potential window for Na 0.5 MnO 2 nanowall arrays can be extended to 0-1.3 V (vs Ag/AgCl) with significantly increased specific capacitance up to 366 F g -1 . The extended potential window for the Na 0.5 MnO 2 electrode provides the opportunity to further increase the cell voltage of aqueous asymmetric supercapacitors beyond 2 V. To construct the asymmetric supercapacitor, carbon-coated Fe 3 O 4 nanorod arrays are synthesized as the anode and can stably work in a negative potential window of -1.3 to 0 V (vs Ag/AgCl). For the first time, a 2.6 V aqueous asymmetric supercapacitor is demonstrated by using Na 0.5 MnO 2 nanowall arrays as the cathode and carbon-coated Fe 3 O 4 nanorod arrays as the anode. In particular, the 2.6 V Na 0.5 MnO 2 //Fe 3 O 4 @C asymmetric supercapacitor exhibits a large energy density of up to 81 Wh kg -1 as well as excellent rate capability and cycle performance, outperforming previously reported MnO 2 -based supercapacitors. This work provides new opportunities for developing high-voltage aqueous asymmetric supercapacitors with further increased energy density. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  1. Effect of LiOH, NaOH and KOH on corrosion and oxide microstructure of Zr-based alloys

    International Nuclear Information System (INIS)

    Jeong, Y.H.; Kim, H.G.; Jung, Y.H.; Ruhmann, H.

    1999-01-01

    Long-term corrosion test, SIMS analysis, and TEM microstructural study were carried out to investigate the corrosion characteristics and mechanism of Zr alloys in alkali hydroxides. The corrosion tests were performed in solutions of LiOH, NaOH, KOH, RbOH, and CsOH at 350 deg. C for 500 days. SIMS analysis was performed for the specimens prepared to have an equal oxide thickness. TEM studies on the specimens with an equal oxide thickness in various solutions in both pre- and post-transition regimes were also conducted. The corrosion rate in alkali hydroxide solutions was observed to decrease as the ionic radius of alkali cation was increased. The penetration depth of cation into the oxide decreases with increasing the ionic radius of cation. Even though the oxide thickness was equal, the different oxide morphologies were observed in specimens. Namely, in LiOH solution the oxide morphology was transformed early from columnar to equiaxed structure. However, in KOH solution the columnar structure was maintained up to post-transition regime. Based on the corrosion test, SIMS analysis, and microstructural study, the cation is considered to control the corrosion in a alkali hydroxide solution and its effect is dependent on the concentration of alkali and the oxide thickness. The slight acceleration of the corrosion rate at a low concentration is thought to be caused by cation incorporation into oxide while the significant acceleration at a high concentration is due to the transformation of oxide microstructure that would be induced by cation incorporation. KOH was shown not to affect significantly the corrosion and the hydrogen pickup of Zircaloy. Therefore, it has a potential for PWR application only from the point of view of Zircaloy corrosion. (author)

  2. A novel temperature-gradient Na±β-alumina solid electrolyte based SOx gas sensor without gaseous reference electrode

    DEFF Research Database (Denmark)

    Rao, N.; Bleek, C.M. Van den; Schoonman, J.

    1992-01-01

    An electrochemical SOx ps sensor with a tubular Na+-beta"-alumina solid electrolyte has been fabricated and tested under non-isothermal conditions. The temperature difference between the reference and working electrode of the sensor cell is about 100-degrees-C, which causes a serious deviation...... of the experimental EMF response from the value as calculated using the Nernst equation for an isothermal system. The experimental results are Consistent with the theoretical prediction for a non-isothermal system. The response time is usually less then 10 min. SEM and EDX have been employed to investigate the sensor...... material before and after use, confirming the formation of a glassy phase of Na2SO4 by an electrochemical reaction at the interface of the platinum electrodes and Na+-beta"-alumina. According to this new theoretical derivation, the sensor design could be simplified by applying the same SO2 ps at the two...

  3. Lead-free piezoelectric (K,Na)NbO3-based ceramic with planar-mode coupling coefficient comparable to that of conventional lead zirconate titanate

    Science.gov (United States)

    Ohbayashi, Kazushige; Matsuoka, Takayuki; Kitamura, Kazuaki; Yamada, Hideto; Hishida, Tomoko; Yamazaki, Masato

    2017-06-01

    We developed a (K,Na)NbO3-based lead-free piezoelectric ceramic with a KTiNbO5 system, (K1- x Na x )0.86Ca0.04Li0.02Nb0.85O3-δ-K0.85Ti0.85Nb1.15O5-BaZrO3-Fe2O3-MgO (K1- x N x N-NTK-FM). K1- x N x N-NTK-FM ceramic exhibits a very dense microstructure and a coupling coefficient of k p = 0.59, which is almost comparable to that of conventional lead zirconate titanate (PZT). The (K,Na)NbO3-based ceramic has the Γ15 mode for a wide x range. The nanodomains of orthorhombic (K,Na)NbO3 with the M3 mode coexist within the tetragonal Γ15 mode (K,Na)NbO3 matrix. Successive phase transition cannot occur with increasing x. The maximum k p is observed at approximately the minimum x required to generate the M3 mode phase. Unlike the behavior at the morphotropic phase boundary (MPB) in PZT, the characteristics of K1- x N x N-NTK-FM ceramic in this region changed moderately. This gentle phase transition seems to be a relaxor, although the diffuseness degree is not in line with this hypothesis. Furthermore, piezoelectric properties change from “soft” to “hard” upon the M3 mode phase aggregation.

  4. Theoretical prediction of morphotropic compositions in Na1/2Bi1/2TiO3-based solid solutions from transition pressures

    Science.gov (United States)

    Gröting, Melanie; Albe, Karsten

    2014-02-01

    In this article we present a method based on ab initio calculations to predict compositions at morphotropic phase boundaries in lead-free perovskite solid solutions. This method utilizes the concept of flat free energy surfaces and involves the monitoring of pressure-induced phase transitions as a function of composition. As model systems, solid solutions of Na1/2Bi1/2TiO3 with the alkali substituted Li1/2Bi1/2TiO3 and K1/2Bi1/2TiO3 and the alkaline earth substituted CaTiO3 and BaTiO3 are chosen. The morphotropic compositions are identified by determining the composition at which the phase transition pressure equals zero. In addition, we discuss the different effects of hydrostatic pressure (compression and tension) and chemical substitution on the antiphase tilts about the [111] axis (a-a-a-) present in pure Na1/2Bi1/2TiO3 and how they develop in the two solid solutions Na1/2Bi1/2TiO3-CaTiO3 and Na1/2Bi1/2TiO3-BaTiO3. Finally, we discuss the advantages and shortcomings of this simple computational approach.

  5. Enhanced photovoltaic performance of dye-sensitized solar cells based on NaYF4:Yb(3+), Er(3+)-incorporated nanocrystalline TiO2 electrodes.

    Science.gov (United States)

    Zhu, Guang; Wang, Hongyan; Zhang, Quanxin; Zhang, Li

    2015-08-01

    Near infrared to visible up-conversion of light by rare earth ion-doped phosphors (NaYF4:Yb(3+), Er(3+)) that convert multiple photons of lower energy to higher energy photons offer new possibilities for improved performance of photovoltaic devices. Here, up-conversion phosphor NaYF4:Yb(3+), Er(3+) doped nanocrystalline TiO2 films are designed and used as a electrode for dye-sensitized solar cells, and the photovoltaic performance of DSSCs based on composite electrodes are investigated. The results show the cell with NaYF4:Yb(3+), Er(3+) achieves a power conversion efficiency of 7.65% under one sun illumination (AM 1.5G, 100mWcm(-2)), which is an increase of 14% compared to the cell without NaYF4:Yb(3+), Er(3+) (6.71%). The performance improvement is attributed to the dual effects of enhanced light harvesting from extended light absorption range and increased light scattering, and lower electron transfer resistance. Copyright © 2015 Elsevier Inc. All rights reserved.

  6. Surface-Based Regional Homogeneity in First-Episode, Drug-Naïve Major Depression: A Resting-State fMRI Study

    Directory of Open Access Journals (Sweden)

    Hui-Jie Li

    2014-01-01

    Full Text Available Background. Previous volume-based regional homogeneity (ReHo studies neglected the intersubject variability in cortical folding patterns. Recently, surface-based ReHo was developed to reduce the intersubject variability and to increase statistical power. The present study used this novel surface-based ReHo approach to explore the brain functional activity differences between first-episode, drug-naïve MDD patients and healthy controls. Methods. Thirty-three first-episode, drug-naïve MDD patients and 32 healthy controls participated in structural and resting-state fMRI scans. MDD patients were rated with a 17-item Hamilton Rating Scale for Depression prior to the scan. Results. In comparison with the healthy controls, MDD patients showed reduced surface-based ReHo in the left insula. There was no increase in surface-based ReHo in MDD patients. The surface-based ReHo value in the left insula was not significantly correlated with the clinical information or the depressive scores in the MDD group. Conclusions. The decreased surface-based ReHo in the left insula in MDD may lead to the abnormal top-down cortical-limbic regulation of emotional and cognitive information. The surface-based ReHo may be a useful index to explore the pathophysiological mechanism of MDD.

  7. A Green Route to a Na2FePO4F-Based Cathode for Sodium Ion Batteries of High Rate and Long Cycling Life.

    Science.gov (United States)

    Deng, Xiang; Shi, Wenxiang; Sunarso, Jaka; Liu, Meilin; Shao, Zongping

    2017-05-17

    Sodium ion batteries (SIBs) are considered one of the most promising alternatives for large-scale energy storage due largely to the abundance and low cost of sodium. However, the lack of high-performance cathode materials at low cost represents a major obstacle toward broad commercialization of SIB technology. In this work, we report a green route strategy that allows cost-effective fabrication of carbon-coated Na 2 FePO 4 F cathode for SIBs. By using vitamin C as a green organic carbon source and environmentally friendly water-based polyacrylic latex as the binder, we have demonstrated that the Na 2 FePO 4 F phase in the as-derived Na 2 FePO 4 F/C electrode shows a high reversible capacity of 117 mAh g -1 at a cycling rate of 0.1 C. More attractively, excellent rate capability is achieved while retaining outstanding cycling stability (∼85% capacity retention after 1000 charge-discharge cycles at a rate of 4 C). Further, in operando X-ray diffraction has been used to probe the evolution of phase structures during the charge-discharge process, confirming the structural robustness of the Na 2 FePO 4 F/C cathode (even when charged to 4.5 V). Accordingly, the poor initial Coulombic efficiency of some anode materials may be compensated by extracting more sodium ions from Na 2 FePO 4 F/C cathode at higher potentials (up to 4.5 V).

  8. Preparation and studying acid - base properties of the compound a -mono thiosemicarbazide isatin-5-Sodium sulfonate (α-MTI-5-SO3Na)

    International Nuclear Information System (INIS)

    Al-Azrak, A.

    2015-01-01

    This research aims to prepare organic compounds containing functional groups and have analytical properties to use as analytical reagents for determination of metal ions by spectrophotometric methods as acid-base indicators and as indicators for metal ions in EDTA titrations in this paper was prepared the compound ((α-mono thiosemicarbazide isatien -5-sodium sulfonate) it showed analytical properties and significant practical applications this compound has in acidic medium yellow color while in the basic medium sharply changes its color to red color the value of pKa of this compound has been calculated by spectrophotometric method and was equal to (8.860±0.054) the pH transition range was between (8.20 to 9.8) the indicator was used for determination the end point of the titration standard samples of solution (0.1M, NaOH) with standard solution of 0.1M, HCI, and in titration standard samples of solution (0.1M, CH 3 COOH) with standard solution of 0.1M NaOH the results were compared with the results obtained by reference titrimetric methods the statistical treatment for allresults shows that the end point determination using acid - base ((α-MTI-5-SO 3 Na) is the most accurate. (author)

  9. Visual and microplate detection of aflatoxin B2 based on NaCl-induced aggregation of aptamer-modified gold nanoparticles

    International Nuclear Information System (INIS)

    Luan, Yunxia; Chen, Jiayi; Li, Cheng; Ping, Hua; Ma, Zhihong; Lu, Anxiang; Xie, Gang

    2015-01-01

    We describe a fast and sensitive method for the detection of aflatoxin B2 (AFB2) that is based on the addition of AFB2-sensitive aptamers to a colloidal solution of gold nanoparticles (AuNPs). Subsequent addition of AFB2 and NaCl to the solution causes a color change from wine-red to blue-purple. Best results are obtained at a pH value of 7.0, a 10 mM aptamer concentration, and a 2 M concentration of NaCl. The method has a linear dynamic range that extends from 0.025 to 10 ng∙mL −1 of AFB2, and the detection limit is 25 pg∙mL −1 . The method is simple, fast, highly sensitive, and enables both visual and microplate readout. (author)

  10. Measurement of exchangeable sodium: 22Na or 24Na

    International Nuclear Information System (INIS)

    Smith, T.; Edmonds, C.J.

    1987-01-01

    A case is made for the use of 22 Na in low activities in preference to 24 Na for routine diagnostic estimation of exchangeable sodium, and is based chiefly on considerations of availability, cost and radiation dosimetry. A method in which only 37 kBq (1 μCi) 22 Na is administered orally is shown to be sufficiently accurate and to possess distinct advantages in terms of cost and convenience with a committed radiation dose no greater than that for a measurement using 24 Na. (author)

  11. Caroço de algodão em dietas à base de palma forrageira para vacas leiteiras: síntese de proteína microbiana Whole cottonseed in forage cactus based diets: synthesis of microbial protein

    Directory of Open Access Journals (Sweden)

    Airon Aparecido Silva de Melo

    2007-08-01

    Full Text Available Objetivou-se avaliar o efeito da inclusão de caroço de algodão em substituição parcial à silagem de sorgo e ao farelo de soja em dietas à base de palma forrageira sobre a produção de proteína microbiana, a eficiência de síntese de proteína microbiana e as concentrações de uréia na urina e de uréia e N-uréia no plasma e no leite de vacas holandesas em lactação. Foram utilizados cinco animais aos 50 dias de lactação, distribuídos em quadrado latino 5 × 5. Os tratamentos consistiram de cinco níveis (0,0; 6,25; 12,50; 18,75 e 25,00% de inclusão de caroço de algodão na MS da dieta. A inclusão de caroço de algodão na dieta não influenciou a síntese de nitrogênio ou proteína microbiana, cujos valores médios foram 295,08 e 1.844,27 g/dia, respectivamente. As eficiências de síntese de nitrogênio e proteína microbiana diminuíram linearmente, em proporções de 0,30 e 1,43 g para cada 1% de caroço de algodão na dieta, respectivamente. Os níveis de uréia na urina e de uréia e N-uréia no plasma e no leite não foram afetados pela inclusão de caroço de algodão na dieta. Portanto, em dietas à base de palma forrageira, a inclusão de caroço de algodão em níveis de até 25% da MS não interfere na síntese de proteína microbiana e nas concentrações de uréia.The objective of this trial was to investigate the effects of partial replacement of sorghum silage and soybean meal with whole cottonseed on microbial protein synthesis and efficiency and nitrogen metabolism in lactating Holstein cows receiving forage cactus based diets. Five animals were randomly assigned to a 5 × 5 Latin square design and were fed diets containing (% of DM: 0.0, 6.25, 12.50, 18.75, and 25.00% of whole cottonseed. Inclusion of whole cottonseed in the diet did not affect microbial nitrogen and microbial protein synthesis, which averaged 295.08 and 1844.27 g/day, respectively. Microbial protein synthesis and microbial nitrogen

  12. High-gain polymer optical waveguide amplifiers based on core-shell NaYF4/NaLuF4: Yb3+, Er3+ NPs-PMMA covalent-linking nanocomposites

    Science.gov (United States)

    Zhang, Meiling; Zhang, Weiwei; Wang, Fei; Zhao, Dan; Qu, Chunyang; Wang, Xibin; Yi, Yunji; Cassan, Eric; Zhang, Daming

    2016-11-01

    Waveguide amplifiers have always been significant key components for optical communication. Unfortunately, the low concentration of rare earth ions doped in the host material and the inadequate optimization of the waveguide structure have been the common bottleneck limitations. Here, a novel material, NaYF4/NaLuF4: 20% Yb3+, 2% Er3+ nanoparticle-Polymeric Methyl Methacrylate covalent-linking nanocomposite, was synthesized. The concentrations of Er3+ and Yb3+ doping increased an order of magnitude. Under a 980 nm laser excitation, highly efficient emission at 1.53 μm was obtained. The characteristic parameters of the single mode waveguide were carefully designed and optimized by using a finite difference method. A formulized iteration method is presented for solving the rate equations and the propagation equations of the EYCDWA, and both the steady state behavior and the gain were numerically simulated. The optimal Er3+ and Yb3+ concentrations are 2.8 × 1026 m-3 and 2.8 × 1027 m-3, and the optimal waveguide length is 1.3 cm. Both theoretical and experimental results indicated that, for an input signal power of 0.1 mW and a pump power of 400 mW, a net gain of 15.1 dB at 1530 nm is demonstrated. This result is the highest gain ever reported in polymer-based waveguide amplifiers doped with inorganic Er3+-Yb3+ codoped nanocrystals.

  13. Low-cost shape-control synthesis of porous carbon film on β″-alumina ceramics for Na-based battery application

    Science.gov (United States)

    Hu, Yingying; Wen, Zhaoyin; Wu, Xiangwei; Jin, Jun

    2012-12-01

    Porous carbon films with tunable pore structure to modify the β″-alumina electrolyte surface are fabricated through a low-cost and direct wet chemistry method with glucose and poly(methyl-methacrylate) (PMMA) as precursors. FTIR analysis confirms the effective connection between the carbohydrate and the pore-forming agent PMMA through hydrogen bonds. The experimental results indicate that the structural parameters of the porous carbon films, including mean pore size and film thickness, can be tuned simply by adjusting the amount of PMMA in the glucose/PMMA composite. This soft-template-assisted method could be readily extended to modify any other ceramic surfaces. The porous carbon films are demonstrated to greatly improve the wettability of the β″-alumina ceramics by molten sodium. Na/β″-alumina/Na cells are used to investigate the interfacial properties between sodium and the β″-alumina electrolyte. The results obtained at 350 °C reveal that the polarization behavior of the cell is alleviated by the porous coating. This work represents a successful method to coat ceramics with porous carbon and offers a promising solution to overcome the polarization problems of the sodium/β″-alumina interface in Na-based batteries.

  14. Tin phosphide-based anodes for sodium-ion batteries: synthesis via solvothermal transformation of Sn metal and phase-dependent Na storage performance

    Science.gov (United States)

    Shin, Hyun-Seop; Jung, Kyu-Nam; Jo, Yong Nam; Park, Min-Sik; Kim, Hansung; Lee, Jong-Won

    2016-01-01

    There is a great deal of current interest in the development of rechargeable sodium (Na)-ion batteries (SIBs) for low-cost, large-scale stationary energy storage systems. For the commercial success of this technology, significant progress should be made in developing robust anode (negative electrode) materials with high capacity and long cycle life. Sn-P compounds are considered promising anode materials that have considerable potential to meet the required performance of SIBs, and they have been typically prepared by high-energy mechanical milling. Here, we report Sn-P-based anodes synthesised through solvothermal transformation of Sn metal and their electrochemical Na storage properties. The temperature and time period used for solvothermal treatment play a crucial role in determining the phase, microstructure, and composition of the Sn-P compound and thus its electrochemical performance. The Sn-P compound prepared under an optimised solvothermal condition shows excellent electrochemical performance as an SIB anode, as evidenced by a high reversible capacity of ~560 mAh g−1 at a current density of 100 mA g−1 and cycling stability for 100 cycles. The solvothermal route provides an effective approach to synthesising Sn-P anodes with controlled phases and compositions, thus tailoring their Na storage behaviour. PMID:27189834

  15. Theoretical characterization of quaternary iridium based hydrides NaAeIrH{sub 6} (Ae = Ca, Ba and Sr)

    Energy Technology Data Exchange (ETDEWEB)

    Bouras, S. [Laboratory of Studies Surfaces and Interfaces of Solids Materials, Department of Physics, Faculty of Science, University of Setif 1, 19000 (Algeria); Ghebouli, B., E-mail: bghebouli@yahoo.fr [Laboratory of Studies Surfaces and Interfaces of Solids Materials, Department of Physics, Faculty of Science, University of Setif 1, 19000 (Algeria); Benkerri, M. [Laboratory of Studies Surfaces and Interfaces of Solids Materials, Department of Physics, Faculty of Science, University of Setif 1, 19000 (Algeria); Ghebouli, M.A., E-mail: med.amineghebouli@yahoo.fr [Microelectronic Laboratory (LMSE), University of Bachir Ibrahimi, Bordj-Bou-Arreridj 34000 (Algeria); Research Unit on Emerging Materials (RUEM), University of Setif 1, 19000 (Algeria); Choutri, H. [Microelectronic Laboratory (LMSE), University of Bachir Ibrahimi, Bordj-Bou-Arreridj 34000 (Algeria); Louail, L.; Chihi, T.; Fatmi, M. [Research Unit on Emerging Materials (RUEM), University of Setif 1, 19000 (Algeria); Bouhemadou, A. [Laboratory for Developing New Materials and Their Characterization, Department of Physics, Faculty of Science, University of Setif 1, 19000 (Algeria); Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451 (Saudi Arabia); Khenata, R.; Khachai, H. [Laboratoire de Physique Quantique et de Modélisation Mathématique, Université de Mascara, 29000 (Algeria)

    2015-01-15

    The quaternary iridium based hydrides NaAeIrH{sub 6} (Ae = Ca, Ba and Sr) are promising candidates as hydrogen storage materials. We have studied the structural, elastic, electronic, optical and thermodynamic properties of NaAeIrH{sub 6} (Ae = Ca, Ba and Sr) within the generalized gradient approximation, the local density approximation (LDA) and mBj in the frame of density functional perturbation theory. These alloys have a large indirect Γ–X band gap. The thermodynamic functions were computed using the phonon density of states. The origin of the possible transitions from valence band to conduction band was illustrated. By using the complex dielectric function, the optical properties such as absorption, reflectivity, loss function, refractive index and optical conductivity have been obtained. - Graphical abstract: Real and imaginary parts of the dielectric function, the absorption spectrum α(ω), reflectivity R(ω) and energy-loss spectrum L(ω). - Highlights: • NaAeIrH{sub 6} (Ae = Ca, Ba and Sr) alloys have been investigated. • The elastic moduli, energy gaps are predicted. • The optical and thermal properties were studied.

  16. Naïve Bayes Approach for Expert System Design of Children Skin Identification Based on Android

    Science.gov (United States)

    Hartatik; Purnomo, A.; Hartono, R.; Munawaroh, H.

    2018-03-01

    The development of technology gives some benefits to each person that we can use it properly and correctly. Technology has helped humans in every way. Such as the excess task of an expert in providing information or answers to a problem. Thus problem that often occurs is skin disease that affecting on child. That because the skin of children still vulnerable to the environment. The application was developed using the naïve Bayes algorithm. Through this application, users can consult with a system like an expert to know the symptoms that occur to the child and find the correct treatment to solve the problems.

  17. The U phase formation in cement-based systems containing high amounts of Na2SO4

    International Nuclear Information System (INIS)

    Li, G.; Moranville, M.; Le Bescop, P.

    1996-01-01

    Simulated cemented low level wastes containing high amounts of Na 2 SO 4 (10--15%) were examined with respect to the mineralogy of the solid phases, chemical composition of the interstitial aqueous phase and immersion behavior in water. All results reveal the formation of a mineral called U phase, first observed by Dosch and zur Strassen in 1967, and its deleterious effects on the samples immersed in water. It appears that this phase can form only at very high alkaline concentration, not compatible with traditional cement paste. Two possible degradation mechanisms associated with the U phase are proposed which are to be elucidated in further works

  18. Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl Solution

    OpenAIRE

    Asmara, Y. P.; Siregar, J. P.; Tezara, C.; Nurlisa, Wan; Jamiluddin, J.

    2016-01-01

    This research focuses on an experimental investigation to identify the effects of fly ash on the electrochemical process of concrete during the curing time. A rebar was analysed using potentiostat to measure the rest potential, polarization diagram, and corrosion rate. Water-to-cement ratio and amount of fly ash were varied. After being cured for 24 hours at a temperature of 65°C, the samples were immersed in 3.5% of NaCl solution for 365 days for electrochemical measurement. Measurements of ...

  19. Improvement of corrosion resistance in NaOH solution and glass forming ability of as-cast Mg-based bulk metallic glasses by microalloying

    Directory of Open Access Journals (Sweden)

    Peng Hao

    2011-02-01

    Full Text Available The influences of the addition of Ag on the glass forming ability (GFA and corrosion behavior were investigated in the Mg-Ni-based alloy system by X-ray diffraction (XRD and electrochemical polarization in 0.1 mol/L NaOH solution. Results shows that the GFA of the Mg-Ni-based BMGs can be improved dramatically by the addition of an appropriate amount of Ag; and the addition element Ag can improve the corrosion resistance of Mg-Ni-based bulk metallic glass. The large difference in atomic size and large negative mixing enthalpy in alloy system can contribute to the high GFA. The addition element Ag improves the forming speed and the stability of the passive film, which is helpful to decrease the passivation current density and to improve the corrosion resistance of Mg-Ni-based bulk metallic glass.

  20. Solidification of ion exchange resins saturated with Na+ ions: Comparison of matrices based on Portland and blast furnace slag cement

    International Nuclear Information System (INIS)

    Lafond, E.; Cau dit Coumes, C.; Gauffinet, S.; Chartier, D.; Stefan, L.; Le Bescop, P.

    2017-01-01

    This work is devoted to the conditioning of ion exchange resins used to decontaminate radioactive effluents. Calcium silicate cements may have a good potential to encapsulate spent resins. However, certain combinations of cement and resins produce a strong expansion of the final product, possibly leading to its full disintegration. The focus is placed on the understanding of the behaviour of cationic resins in the Na + form in Portland or blast furnace slag (CEM III/C) cement pastes. During hydration of the Portland cement paste, the pore solution exhibits a decrease in its osmotic pressure, which causes a transient expansion of small magnitude of the resins. At 20 °C, this expansion takes place just after setting in a poorly consolidated material and is sufficient to induce cracks. In the CEM III/C paste, swelling of the resins also occurs, but before the end of setting, and induces limited stress in the matrix which is still plastic. - Highlights: • Solidification of cationic resins in the Na + -form is investigated. • Portland and blast furnace slag cements are compared. • Deleterious expansion is observed with Portland cement only. • Resin swelling is due to a decrease in the osmotic pressure of the pore solution. • The consolidation rate of the matrix is a key parameter to prevent damage.

  1. Auto-percepções em adolescentes : uma intervenção com base na análise de letras musicais

    OpenAIRE

    Santos, Inês Martins dos

    2014-01-01

    Tese de mestrado, Psicologia (Secção de Psicologia Clínica e da Saúde - Núcleo de Psicoterapia Cognitiva-Comportamental e Integrativa), Universidade de Lisboa, Faculdade de Psicologia, 2014 O presente trabalho teve como principal objectivo a exploração de letras musicais como método com potencial para alterar as auto-percepções, analisando o potencial de criação de programas de intervenção com base na análise de letras musicais para aplicar em escolas ou instituições de forma a promover co...

  2. Calculation of the acid-base equilibrium constants at the alumina/electrolyte interface from the ph dependence of the adsorption of singly charged ions (Na+, Cl-)

    Science.gov (United States)

    Gololobova, E. G.; Gorichev, I. G.; Lainer, Yu. A.; Skvortsova, I. V.

    2011-05-01

    A procedure was proposed for the calculation of the acid-base equilibrium constants at an alumina/electrolyte interface from experimental data on the adsorption of singly charged ions (Na+, Cl-) at various pH values. The calculated constants (p K {1/0}= 4.1, p K {2/0}= 11.9, p K {3/0}= 8.3, and p K {4/0}= 7.7) are shown to agree with the values obtained from an experimental pH dependence of the electrokinetic potential and the results of potentiometric titration of Al2O3 suspensions.

  3. Doping dependence of the anisotropic quasiparticle interference in NaFe(1-x)Co(x)As iron-based superconductors.

    Science.gov (United States)

    Cai, Peng; Ruan, Wei; Zhou, Xiaodong; Ye, Cun; Wang, Aifeng; Chen, Xianhui; Lee, Dung-Hai; Wang, Yayu

    2014-03-28

    We use scanning tunneling microscopy to investigate the doping dependence of quasiparticle interference (QPI) in NaFe1-xCoxAs iron-based superconductors. The goal is to study the relation between nematic fluctuations and Cooper pairing. In the parent and underdoped compounds, where fourfold rotational symmetry is broken macroscopically, the QPI patterns reveal strong rotational anisotropy. At optimal doping, however, the QPI patterns are always fourfold symmetric. We argue this implies small nematic susceptibility and, hence, insignificant nematic fluctuation in optimally doped iron pnictides. Since TC is the highest this suggests nematic fluctuation is not a prerequistite for strong Cooper pairing.

  4. Highly sensitive and selective cartap nanosensor based on luminescence resonance energy transfer between NaYF4:Yb,Ho nanocrystals and gold nanoparticles.

    Science.gov (United States)

    Wang, Zhijiang; Wu, Lina; Shen, Baozhong; Jiang, Zhaohua

    2013-09-30

    Fluorescent detection is an attractive method for the detection of toxic chemicals. However, most chemosensors that are currently utilized in fluorescent detection are based on organic dyes or quantum dots, which suffer from instability, high background noise and interference from organic impurities in solution, which can also be excited by UV radiation. In the present research, we developed a novel NaYF4:Yb,Ho/Au nanocomposite-based chemosensor with high sensitivity (10 ppb) and selectivity over competing analytes for the detection of the insecticide cartap. This nanosensor is excited with a 970-nm laser instead of UV radiation to give an emission peak at 541 nm. In the presence of cartap, the nanocomposites aggregate, resulting in enhanced luminescence resonance energy transfer between the NaYF4:Yb,Ho nanocrystals and the gold nanoparticles, which decreases the emission intensity at 541 nm. The relative luminescence intensity at 541 nm has a linear relationship with the concentration of cartap in the solution. Based on this behavior, the developed nanosensor successfully detected cartap in farm produce and water samples with satisfactory results. Copyright © 2013 Elsevier B.V. All rights reserved.

  5. Utilização de subprodutos de origem animal em dietas formuladas com base em proteína bruta e proteína ideal para frangos de corte de 22 a 42 dias de idade Use of animal by-products in diets formulated based on crude and ideal protein fed to broilers from 22 to 42 days of age

    Directory of Open Access Journals (Sweden)

    Luciana Cardoso Cancherini

    2005-04-01

    Full Text Available Foi conduzido um experimento para avaliar a utilização de subprodutos de origem animal em dietas para frangos de corte de 22 a 42 dias de idade, formuladas com base nos conceitos de proteína bruta e proteína ideal. O delineamento foi inteiramente casualizado em esquema fatorial 2x2+1, ou seja, duas fontes de proteína de origem animal (farinha de vísceras de aves e farinha de sangue bovino, dois conceitos de formulação (proteína bruta e proteína ideal e uma dieta controle à base de milho e farelo de soja, com quatro repetições. As características avaliadas foram ganho de peso, consumo de ração, conversão alimentar, rendimentos de carcaça e de peito e gordura abdominal. O ganho de peso, consumo de ração e conversão alimentar não foram afetados pelas fontes de proteína e conceitos de formulação, no entanto, o teor de gordura abdominal foi menor nas aves alimentadas com farinha de vísceras que naquelas alimentadas com dieta contendo farinha de sangue.An experiment was conducted to evaluate the use of animal by-products in diets of broilers from 22 to 42 days of age, formulated based on crude and ideal protein concepts. The experimental design was a completely randomized in a factorial arrangement 2x2+1 with two animal protein sources (poultry viscera meal and bovine blood meal, two formulation concepts (based on crude and ideal protein and a control diet based on corn and soybean meal, with four replications. The evaluated characteristics were weight gain, feed intake, feed: gain ratio, carcass and breast yield and abdominal fat content. Weight gain, feed intake and feed: gain ratio were not affected by the protein sources and formulation concepts, however, abdominal fat content of broilers fed diets with poultry viscera meal was lower compared to birds that fed diets containing bovine blood meal.

  6. Qualidade de uva ‘Isabel’ tratada na pré-colheita com CaCl2 e elicitor à base de biomassa cítrica

    Directory of Open Access Journals (Sweden)

    Leonardo da Silva Santos

    2017-10-01

    Full Text Available O alto índice de degrana e podridão das bagas reduzem a qualidade e elevam as perdas pós-colheita em uvas ‘Isabel’, demandando técnicas de manejo na pré e pós-colheita acessíveis ao pequeno produtor, que mantenham a qualidade e ampliem a vida útil pós-colheita dos cachos. Assim, este trabalho teve por objetivo avaliar o efeito da aplicação na pré-colheita de CaCl2 e elicitor à base de biomassa cítrica em uvas ‘Isabel’ na manutenção da qualidade durante o armazenamento na condição ambiente sob atmosferas ambiente e modificada. O experimento foi conduzido em blocos casualizados a campo, no município de São Vicente Férrer-PE com 8 repetições. Videiras ‘Isabel’ foram tratadas, 28 dias antes da colheita, com: elicitor de Biomassa Cítrica (BC, elicitor de Biomassa Cítrica + CaCl2 (BC+C, CaCl2 (C e Testemunha (T - sem aplicação. Cachos colhidos na maturação comercial foram armazenados em arranjo fatorial 4×2×7, sendo 4 tratamentos (aplicados no campo, 2 condições de armazenamento, atmosferas ambiente (AA e modificada (AM, sob condição ambiente (25±2°C e 75±2% de UR e 7 períodos de avaliação em quatro repetições. A aplicação de CaCl2 e do elicitor BC reduziu o índice de degrana (55 e 75%, respectivamente, a podridão e a perda de massa dos cachos de uva ‘Isabel’. Estes tratamentos, associados ou não, aumentaram a eficiência da AM em manter a qualidade dos cachos. O índice de degrana de uva ‘Isabel’ foi influenciado diretamente pela relação SS/AT, pH e índice de podridão das bagas.

  7. DIAGNÓSTICO DA REALIDADE DOS CRIATÓRIOS DE AVES NA COMUNIDADE BASE FÍSICA – IPANGUAÇU/RN

    Directory of Open Access Journals (Sweden)

    José Geraldo Bezerra Galvão Júnior

    2010-02-01

    Full Text Available Este trabalho objetivou realizar um diagnóstico de caracterização dos sistemas de criação de aves adotados na Comunidade Rural Base Física, município de Ipanguaçu/RN, com o intuito de produzir subsídios para orientação de ações de suporte técnico à comunidade local. Foram elaborados e aplicados 50 questionários, com questões relacionadas ao perfil socioeconômico dos criadores e aos aspectos zootécnicos relativos à criação de aves. Posteriormente, os dados foram agrupados e analisados graficamente, utilizando-se planilha eletrônica. Na análise dos resultados, a maioria dos entrevistados corresponderam ao gênero feminino (70%, faixa etária de 41 a 60 anos (50%, representados em sua maioria por agricultores (52%, apresentando renda familiar de menos de 1 salário mínimo (16%, até 2 salários (20% e acima de 2 salários mínimos (34%. Na análise das respostas referentes aos aspectos zootécnicos da criação de aves, constatou-se um rebanho efetivo de 1046 aves, onde 81% dos entrevistados mantinham a criação para consumo da família. A avicultura representa grande importância na agricultura familiar da região, tanto na questão de segurança alimentar para a família quanto no aspecto econômico. A alimentação foi considerada o principal fator limitante para o desenvolvimento da criação, seguida da área para criação e presença de doenças nas aves. Programas de capacitação e assistência técnica devem ser implantados, para que possa haver um incremento quantitativo e qualitativo da criação de aves, principalmente, ligados aos aspectos de manejo alimentar e sanitário, bem como, no delineamento de modelos produtivos que expressem competitividade no setor. PALAVRAS-CHAVE: avicultura, sistemas de criação, agricultura familiar.

  8. Sequence based prediction of DNA-binding proteins based on hybrid feature selection using random forest and Gaussian naïve Bayes.

    Directory of Open Access Journals (Sweden)

    Wangchao Lou

    Full Text Available Developing an efficient method for determination of the DNA-binding proteins, due to their vital roles in gene regulation, is becoming highly desired since it would be invaluable to advance our understanding of protein functions. In this study, we proposed a new method for the prediction of the DNA-binding proteins, by performing the feature rank using random forest and the wrapper-based feature selection using forward best-first search strategy. The features comprise information from primary sequence, predicted secondary structure, predicted relative solvent accessibility, and position specific scoring matrix. The proposed method, called DBPPred, used Gaussian naïve Bayes as the underlying classifier since it outperformed five other classifiers, including decision tree, logistic regression, k-nearest neighbor, support vector machine with polynomial kernel, and support vector machine with radial basis function. As a result, the proposed DBPPred yields the highest average accuracy of 0.791 and average MCC of 0.583 according to the five-fold cross validation with ten runs on the training benchmark dataset PDB594. Subsequently, blind tests on the independent dataset PDB186 by the proposed model trained on the entire PDB594 dataset and by other five existing methods (including iDNA-Prot, DNA-Prot, DNAbinder, DNABIND and DBD-Threader were performed, resulting in that the proposed DBPPred yielded the highest accuracy of 0.769, MCC of 0.538, and AUC of 0.790. The independent tests performed by the proposed DBPPred on completely a large non-DNA binding protein dataset and two RNA binding protein datasets also showed improved or comparable quality when compared with the relevant prediction methods. Moreover, we observed that majority of the selected features by the proposed method are statistically significantly different between the mean feature values of the DNA-binding and the non DNA-binding proteins. All of the experimental results indicate that

  9. Uranium-Based Cermet Alloys; Cermets a base d'uranium; Metallokeramicheskie splavy na osnove urana; Cermets a base de uranio

    Energy Technology Data Exchange (ETDEWEB)

    Ivanov, V. E.; Zelenskij, V. F.; Voloshchuk, A. I.; Grishok, V. N. [Fiziko-Tekhnicheskij Institut an USSR, Khar' kov, SSSR (Russian Federation)

    1963-11-15

    The paper describes certain features of dispersion-hardened uranium-based cermets. As possible hardening materials, consideration was given to UO{sub 2}, UC, Al{sub 2}O{sub 3}, MgO and UBe{sub 13}. Data were obtained on the behaviour of uranium alloys containing the above-mentioned admixtures during creep tests, short-term strength tests and cyclic thermal treatment. The corrosion resistance o f UBe{sub 13}-based uranium alloys was also studied. )author) [French] Les auteurs decrivent certaines proprietes de cermets a base d'uranium, dont la resistance a ete accrue a l'aide de particules dispersees. Les materiaux utilises a cette fin sont notamment: UO{sub 2}, UC, Al{sub 2}O{sub 3}, MgO et UBe{sub 13}. Les auteurs indiquent les donnees obtenues sur le comportement des cermets a l'uranium; durant les essais de fluage, les essais de resistance a court terme et le traitement thermique cyclique, en mentionnant les substances ajoutees. Ils etudient enfin la resistance a la corrosion des cermets d'uranium et UBe{sub 13}. (author) [Spanish] Los autores describen algunas propiedades de los cermets a base de uranio, reforzados por particulas de diversos compuestos en dispersion. En calidad de posibles materiales de refuerzo, ensayaron el UO{sub 2}, el UC, el Al{sub 2}O{sub 3}, el MgO y el UBe{sub 13}. Obtuvieron datos sobre el comportamiento de esas aleaciones en ensayos de fluencia, ensayoe rapidos de resistencia y tratamiento termico ciclico. Por ultimo, estudiaron la resistencia a la corrosion de las aleaciones de uranio a base de UBe{sub 13}. (author) [Russian] Daetsya opisanie nekotorykh svojstv metallokeramicheskikh splavov urana, uprochnennykh dispersionnymi chastitsami. V kachestve vozmozhnykh uprochnyayushchikh materialov izuchalis' UO{sub 2}, UC, Al{sub 2}O{sub 3} , MgO i UBe{sub 13}. Polucheny dannye o povedenii splavov urana s ukazannymi primesyami pri kripovykh ispytaniyakh, pri kratkovremennykh prochnostnykh ispytaniyakh i pri tsiklicheskoj termoobrabotke

  10. Tailoring Highly N-Doped Carbon Materials from Hexamine-Based MOFs: Superior Performance and New Insight into the Roles of N Configurations in Na-Ion Storage.

    Science.gov (United States)

    Liu, Sitong; Zhou, Jisheng; Song, Huaihe

    2018-03-01

    To prepare highly N-doped carbon materials (HNCs) as well as to determine the influence of N dopants on Na-ion storage performance, hexamine-based metal-organic frameworks are employed as new and efficient precursors in the preparation of HNCs. The HNCs possess reversible capacities as high as 160 and 142 mA h g -1 at 2 A g -1 (≈8 C) and 5 A g -1 (≈20 C), respectively, and maintain values of 145 and 123 mA h g -1 after 500 cycles, thus exhibiting excellent rate and long-term cyclic performance. Based on systematic analysis, a new insight into the roles of the different N configurations in Na-ion storage is proposed. The adsorption of Na ions on pyridinic-N (N-6) and pyrrolic-N (N-5) is fully irreversible, whereas the adsorption on graphitic-N (N-Q) is partially reversible and the adsorption on N-oxide (N-O) is fully reversible. More importantly, the N-6/N-Q ratio is an intrinsic parameter that reflects the relationship between the N configurations and carbon textures for N-doped carbons prepared from in situ pyrolysis of organic precursors. The cyclic stability and rate-performance improve with decreasing N-6/N-Q ratio. Therefore, this work is of great significance for the design of N-doped carbon electrodes with high performance for sodium ion batteries. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  11. Solidification of ion exchange resins saturated with Na+ ions: Comparison of matrices based on Portland and blast furnace slag cement

    Science.gov (United States)

    Lafond, E.; Cau dit Coumes, C.; Gauffinet, S.; Chartier, D.; Stefan, L.; Le Bescop, P.

    2017-01-01

    This work is devoted to the conditioning of ion exchange resins used to decontaminate radioactive effluents. Calcium silicate cements may have a good potential to encapsulate spent resins. However, certain combinations of cement and resins produce a strong expansion of the final product, possibly leading to its full disintegration. The focus is placed on the understanding of the behaviour of cationic resins in the Na+ form in Portland or blast furnace slag (CEM III/C) cement pastes. During hydration of the Portland cement paste, the pore solution exhibits a decrease in its osmotic pressure, which causes a transient expansion of small magnitude of the resins. At 20 °C, this expansion takes place just after setting in a poorly consolidated material and is sufficient to induce cracks. In the CEM III/C paste, swelling of the resins also occurs, but before the end of setting, and induces limited stress in the matrix which is still plastic.

  12. Tracking of physical activity from adolescence to adulthood: a population-based study Continuidade na prática de atividade física da adolescência para a idade adulta: estudo de base populacional

    Directory of Open Access Journals (Sweden)

    Mario Renato Azevedo

    2007-02-01

    Full Text Available OBJECTIVE: To assess the association between regular physical activity in adolescence and leisure-time physical activity in adulthood, with emphasis on gender differences. METHODS: A population-based cross-sectional study was carried out in Pelotas, Southern Brazil, in 2003. A representative sample of households was selected in multiple stages and subjects aged 20-59 years were interviewed. Leisure-time physical activity was evaluated using the International Physical Activity Questionnaire. Data on adolescent physical activity were based on subjects' recall. RESULTS: Of 2,577 subjects interviewed, 27.5% were classified as adequately active, and 54.9% reported regular physical activity in adolescence. Subjects who engaged in regular physical activity during adolescence were more likely to be adequately active in adulthood (adjusted prevalence ratio 1.42; 95% CI: 1.23; 1.65. This effect was stronger in women (adjusted prevalence ratio: 1.51; 95% CI: 1.22; 1.86 than men (adjusted prevalence ratio: 1.35; 95% CI: 1.10; 1.67. CONCLUSIONS: Promoting physical activity in school age may be a successful intervention against the epidemic of adult inactivity. Although women were less likely to report regular physical activity in adolescence, the effect of this experience on adult behavior was stronger than in men.OBJETIVO: Avaliar a associação entre a prática de atividades físicas sistematizadas na adolescência e o nível de atividade física no lazer na idade adulta, com ênfase nas diferenças quanto ao gênero. MÉTODOS: Estudo transversal de base populacional foi realizado em Pelotas, Brasil, 2003. Amostra representativa de domicílios foi selecionada em múltiplos estágios. Indivíduos com idades entre 20 e 59 anos foram entrevistados. As atividades físicas de lazer foram investigadas por meio do Questionário Internacional de Atividades Físicas. Dados sobre atividade física na adolescência foram baseados em recordatório. RESULTADOS: Entre

  13. Sentidos argumentativos e polifônicos de números, no discurso, com base na semântica argumentativa = Argumentative and polyphonic meanings of numbers, within discourse, based on argumentative semantics

    Directory of Open Access Journals (Sweden)

    Gomes, Lauro

    2016-01-01

    Full Text Available Com base na Semântica Argumentativa, proposta por Oswald Ducrot e colaboradores, este trabalho propõe-se a examinar e a explicitar a relação semântico-argumentativa existente entre linguagens verbal e numérica no discurso. Para tanto, realiza-se uma análise argumentativa e polifônica de um discurso, cujos números nele empregados ganham a função própria de signo linguístico, constituem enunciados e notadamente argumentam. Desse modo, este artigo vai ao encontro de trabalhos desenvolvidos na área de educação matemática, como o de Ole Skovsmose (2013, em que o autor defende que a matemática serve de suporte para argumentações e debates ligados a questões sociais e, portanto, torna-se parte de uma linguagem que influencia na tomada de importantes decisões na sociedade contemporânea. Pretende-se, pois, introduzir uma discussão teórico-aplicada e interdisciplinar, que, além de permitir o avanço das ciências linguística e matemática, poderá fornecer ferramentas de leitura a serem utilizadas no ensino de língua e no de ciências exatas

  14. The electrochemical performance of aqueous rechargeable battery of Zn/Na0.44MnO2 based on hybrid electrolyte

    Science.gov (United States)

    Wu, Xianwen; Li, Yehua; Xiang, Yanhong; Liu, Zhixiong; He, Zeqiang; Wu, Xianming; Li, Youji; Xiong, Lizhi; Li, Chuanchang; Chen, Jian

    2016-12-01

    There is a broad application prospect for smart grid about aqueous rechargeable sodium-ion battery. In order to improve its electrochemical performance, a hybrid cationic aqueous-based rechargeable battery system based on the nanostructural Na0.44MnO2 and metallic zinc foil as the positive and negative electrodes respectively is built up. Nano rod-like Na0.44MnO2 is synthesized by sol-gel method followed by calcination at 850 °C for 9 h, and various characterization techniques including the X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used to investigate the structure and morphology of the as-prepared material. The cyclic voltammetry, galvanostatic charge-discharge and self-discharge measurements are performed at the same time. The results show that the battery delivers a very high initial discharge capacity of 186.2 mAh g-1 at 0.2 C-rate in the range of 0.5-2.0 V, and it exhibits a discharge capacity of 113.3 mAh g-1 at high current density of 4 C-rate, indicative of excellent rate capability.

  15. Crystal structure of (Na0.70(Na0.70,Mn0.30(Fe3+,Fe2+2Fe2+(VO43, a sodium-, iron- and manganese-based vanadate with the alluaudite-type structure

    Directory of Open Access Journals (Sweden)

    Elhassan Benhsina

    2016-02-01

    Full Text Available The title compound, sodium (sodium,manganese triiron(II,III tris[vanadate(V], (Na0.70(Na0.70,Mn0.30(Fe3+,Fe2+2Fe2+(VO43, was prepared by solid-state reactions. It crystallizes in an alluaudite-like structure, characterized by a partial cationic disorder. In the structure, four of the 12 sites in the asymmetric unit are located on special positions, three on a twofold rotation axis (Wyckoff position 4e and one on an inversion centre (4b. Two sites on the twofold rotation axis are entirely filled by Fe2+ and V5+, whereas the third site has a partial occupancy of 70% by Na+. The site on the inversion centre is occupied by Na+ and Mn2+ cations in a 0.7:0.3 ratio. The remaining Fe2+ and Fe3+ atoms are statistically distributed on a general position. The three-dimensional framework of this structure is made up of kinked chains of edge-sharing [FeO6] octahedra stacked parallel to [10-1]. These chains are held together by VO4 tetrahedral groups, forming polyhedral sheets perpendicular to [010]. Within this framework, two types of channels extending along [001] are present. One is occupied by (Na+/Mn2+ while the second is partially occupied by Na+. The mixed site containing (Na+/Mn2+ has an octahedral coordination sphere, while the Na+ cations in the second channel are coordinated by eight O atoms.

  16. Initial isotopic geochemistry ({delta} 18 O, {delta} D) of fluids from wells of the Los Humeros, Pue., geothermal field; Geoquimica isotopica ({delta} 18 O, {delta} D) inicial de fluidos de pozos del campo geotermico de Los Humeros, Pue.

    Energy Technology Data Exchange (ETDEWEB)

    Barragan Reyes, Rosa Maria; Arellano Gomez, Victor Manuel [Instituto de Investigaciones Electricas, Gerencia de Geotermia, Cuernavaca, Morelos (Mexico)]. E-mail: rmb@iie.org.mx; Ramirez Montes, Miguel; Tovar Aguado, Rigoberto [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Morelia, Michoacan (Mexico)

    2010-01-15

    Isotopic data ({delta} 18 O, {delta} D) from fluids from production wells at the Los Humeros, Pue., geothermal field were analyzed to investigate the possible origin of these fluids and the dominant processes of the reservoir at its initial state. According to pre-exploitation data, it is suggested the Los Humeros reservoir fluids are made of a mixture of meteoric water of very light isotopic composition (paleo-fluids) and andesitic water. The relationship {delta} D vs {delta} 18 O from pre-exploitation data indicates the produced fluids are composed of a mixture of (at least) two fluids with distinct isotopic compositions. At the more enriched end of the mixing relationship are the isotopic compositions of the wells H-23 and H-18 (located in the southern area of the field), while the lighter fluids were found in well H-16 (originally) and then in well H-16 (repaired). It was found that the liquid phases of deep wells are more enriched in {delta} 18 O while the shallow wells present lower values, suggesting a convection process at the initial state. Based on this isotopic profile, it is considered that even the production depths of the wells H-1, H-12 and H-16 (repaired) are just about the same, but their respective isotopic compositions are quite different. The {delta} 18 O value for well H-16 (repaired) seems to be that of condensate steam, while the corresponding values for wells H-1 and H-12 fall within the value interval of the deep wells (H-23). This suggests wells H-1 and H-12 are collecting very deep fluids enriched in {delta} 18 O. These results could be useful in creating a conceptual model of the reservoir. [Spanish] Se analizaron datos isotopicos ({delta}18 O, {delta}D) de los fluidos de pozos productores del campo geotermico de Los Humeros, Pue., para investigar el posible origen de los fluidos asi como los procesos dominantes del yacimiento en su estado inicial. De acuerdo con datos previos a la explotacion, se plantea que los fluidos del yacimiento

  17. Produção Científica sobre Família e Comunidade na Base de Dados PePSIC (2002/2012

    Directory of Open Access Journals (Sweden)

    Tales Vilela Santeiro

    Full Text Available Esta revisão sistemática de literatura teve por objetivo mapear as variáveis relacionadas à produção científica sobre família e comunidade, indexada na base de dados Periódicos Eletrônicos em Psicologia (PePSIC. A busca de informações foi realizada por meio dos vocábulos "família" e "comunidade" e contemplou artigos completos, publicados entre 2002 e 2012 (n = 44. Foi realizado tratamento quantitativo e qualitativo na amostra. No geral, os estudos foram produzidos no sudeste brasileiro, em instituições privadas de ensino superior, com relativo destaque para investigações empíricas e relatos de experiência desenvolvidos por mulheres, e na modalidade de autoria múltipla. A produção foi divulgada em periódicos nacionais, que seguem critérios editoriais reconhecidos pela comunidade acadêmica (Qualis/CAPES. Temáticas sobre infância e adolescência foram priorizadas nos trabalhos, com diversidade de enfoques teóricos da Psicologia. As intervenções psicológicas relatadas abarcaram propostas terapêuticas e não terapêuticas, individuais e grupais, e transcorreram em ambientes institucionais. Análises comparativas, com amostras obtidas em outras fontes de informação, são desejáveis e encontram-se em andamento.

  18. Radiolabeling of DOTA-like conjugated peptides with generator-produced 68Ga and using NaCl-based cationic elution method

    Science.gov (United States)

    Mueller, Dirk; Breeman, Wouter A P; Klette, Ingo; Gottschaldt, Michael; Odparlik, Andreas; Baehre, Manfred; Tworowska, Izabela; Schultz, Michael K

    2017-01-01

    Gallium-68 (68Ga) is a generator-produced radionuclide with a short half-life (t½ = 68 min) that is particularly well suited for molecular imaging by positron emission tomography (PET). Methods have been developed to synthesize 68Ga-labeled imaging agents possessing certain drawbacks, such as longer synthesis time because of a required final purification step, the use of organic solvents or concentrated hydrochloric acid (HCl). In our manuscript, we provide a detailed protocol for the use of an advantageous sodium chloride (NaCl)-based method for radiolabeling of chelator-modified peptides for molecular imaging. By working in a lead-shielded hot-cell system, 68Ga3+ of the generator eluate is trapped on a cation exchanger cartridge (100 mg, ∼8 mm long and 5 mm diameter) and then eluted with acidified 5 M NaCl solution directly into a sodium acetate-buffered solution containing a DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) or DOTA-like chelator-modified peptide. The main advantages of this procedure are the high efficiency and the absence of organic solvents. It can be applied to a variety of peptides, which are stable in 1 M NaCl solution at a pH value of 3–4 during reaction. After labeling, neutralization, sterile filtration and quality control (instant thin-layer chromatography (iTLC), HPLC and pH), the radiopharmaceutical can be directly administered to patients, without determination of organic solvents, which reduces the overall synthesis-to-release time. This procedure has been adapted easily to automated synthesis modules, which leads to a rapid preparation of 68Ga radiopharmaceuticals (12–16 min). PMID:27172166

  19. ECONOMIA CRIATIVA NA PRODUÇÃO CIENTÍFICA BRASILEIRA EM ADMINISTRAÇÃO: MAPEAMENTO BIBLIOMÉTRICO NAS BASES ANPAD, CAPES E SPELL.

    Directory of Open Access Journals (Sweden)

    Patricia Grenfell Oliveira

    2016-03-01

    Full Text Available A economia criativa ganhou grande repercussão nos últimos anos, devido a seu forte papel dinâmico, onde sua principal característica é o impacto de seus bens e serviços em vários setores da economia, o que tem provocado processos de mudanças sociais, políticas, econômicas e organizacionais profundas. Contudo, na perspectiva da gestão, o tema tem sido pouco explorado. Este artigo visa mapear a produção científica brasileira sobre economia criativa, tema que tem se destacado cada vez mais, tanto por suas características voltadas para inovação, como por ser objeto de estudo na abordagem da teoria institucional e pelo papel de destaque na economia mundial. A metodologia do estudo compreende ainda o uso da análise bibliométrica, com foco em produções sobre a economia criativa nos anais da ANPAD, no portal de periódicos SPELL e no banco de teses da CAPES, com o suporte do software Zotero. Tem-se como objetivo geral desta pesquisa catalogar e caracterizar das produções científicas nas bases mencionadas com identificação de suas temáticas. São objetivos específicos: classificar as produções conforme as principais dimensões sobre economia criativa; e evidenciar as áreas de economia criativa em que os estudos mais se concentram. Os resultados desta pesquisa apontam caminhos principais que a produção científica brasileira tem trilhado nos estudos sobre a economia criativa e o que ainda é necessário investigar nestas atividades que crescem cada vez mais.

  20. Gênero, sustentabilidade e desenvolvimento: uma análise sobre o papel da mulher na agricultura familiar de base ecológica

    Directory of Open Access Journals (Sweden)

    Patrícia Braga Lovatto

    2010-05-01

    Full Text Available A partir do reconhecimento da histórica conexão entre as mulheres e a natureza, busca-se no presente trabalho analisar elementos referentes às influências de gênero sobre o desenvolvimento rural sustentável, utilizando para tanto a discussão de dados obtidos em pesquisas recentes que investigaram os meios que levaram a transição de alguns grupos de agricultores familiares para o modelo de base ecológica. Demonstra-se no decorrer da análise que as mulheres ocupam lugar estratégico na reformulação produtiva da unidade familiar, pois representam, na maioria das vezes o centro de uma rede de ligações que permitem um questionamento crítico e por vezes libertador das formas de produção convencionais. Nesse contexto, pretende-se fornecer subsídios para realização de novos trabalhos investigativos que abordem a temática, contribuindo para a formulação de estratégias que estimulem as agricultoras familiares na tomada de decisões, reduzindo as desigualdades e dificuldades que ainda persistem neste processo. Espera-se, portanto, que diante de novas pesquisas seja possível buscar mecanismos que permitam o fortalecimento da mulher no meio rural, reafirmando de forma contínua o importante papel que desempenham para o desenvolvimento rural sustentável.

  1. Agricultura orgânica em áreas urbanas e periurbanas com base na agroecologia Challenges of organic agriculture in urban and suburban areas

    Directory of Open Access Journals (Sweden)

    Adriana Maria de Aquino

    2007-06-01

    Full Text Available A agricultura orgânica com base na agroecologia é o mote tecnológico adequado à realidade dos agroecossistemas urbanos. Este artigo ressalta a necessidade de se desenvolver tecnologias e insumos específicos. A partir de experiências com agricultura urbana em diferentes países em desenvolvimento, evidencia-se a necessidade de se buscar capacidades locais e apoio do poder público, especialmente nas iniciativas da sociedade organizada e mobilizada para a produção agrícola urbana.This article presents organic agriculture, based on agroecology, as the appropriate technology for the urban agro-ecosystem. It also points out the need for appropriate technologies and amendments development. Looking at experiences with urban agriculture in development countries, it shows the need for local capacity development and a search for the public sector support, specially of organized groups mobilized for urban agriculture production.

  2. Načrtovan porod na domu

    OpenAIRE

    Todorović, Tamara; Takač, Iztok

    2017-01-01

    Izhodišča: Porod na domu je sicer star toliko kot človeštvo, pa vendar v veliki večini srednje in visoko razvitih držav prevladuje mnenje, da so zaradi nepredvidljivosti zapletov porodnišnice najbolj varno okolje za rojevanje. Kljub temu obstaja peščica držav, v katerih je porod na domu integriran v sistem zdravstvenega varstva (npr. Nizozemska, Velika Britanija, Kanada). Pri porodih na domu ločimo nenačrtovane in načrtovane porode na domu, slednje pa lahko nadalje razdelimo še na porode s sp...

  3. Production of fly ash-based geopolymers using activator solutions with different Na{sub 2}O and Na{sub 2}SiO{sub 3} compositions; Producao de geopolimeros a base de cinza volante usando solucoes ativadoras com diferentes composicoes de Na{sub 2}O e Na{sub 2}SiO{sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    Azevedo, A.G. de S.; Strecker, K.; Araujo Junior, A.G. de; Silva, C.A. da [Universidade Federal de Sao Joao del-Rei (UFSJ), MG (Brazil)

    2017-04-15

    Geopolymers are a new class of binder with high mechanical strength, chemical inertia and can be made of by-products. In this work fly ash from a Brazilian power station was used to produce the geopolymer cement. To produce the geopolymers, different activator solutions were used in order to study the influence of the chemical composition of these solutions on the production of the fly ash-based geopolymers. The results showed that the Brazilian fly ash has the potential to be used in the geopolymerization process. The specimens presented high compression strength, 28 MPa after 24 h and 48 MPa after 28 days of cure. The X-ray diffraction of the original fly ash and the geopolymers samples exhibited some mineral phases presents in the fly ash and new zeolitic phases formed after the geopolymerization process. The infrared spectroscopic of all samples showed some modifications of absorption bands besides new bands corresponding to the geopolymerization process. The physical properties, such as the water absorption, porosity and permeability, changed when the activator solution changed and the curing time was modified. (author)

  4. Long Term Corrosion Experiment of Steel Rebar in Fly Ash-Based Geopolymer Concrete in NaCl Solution

    Directory of Open Access Journals (Sweden)

    Y. P. Asmara

    2016-01-01

    Full Text Available This research focuses on an experimental investigation to identify the effects of fly ash on the electrochemical process of concrete during the curing time. A rebar was analysed using potentiostat to measure the rest potential, polarization diagram, and corrosion rate. Water-to-cement ratio and amount of fly ash were varied. After being cured for 24 hours at a temperature of 65°C, the samples were immersed in 3.5% of NaCl solution for 365 days for electrochemical measurement. Measurements of the half-cell potential and corrosion current density indicated that the fly ash has significant effects on corrosion behaviour of concrete. Although fly ash tends to create passivity on anodic current, it increases corrosion rate. The corrosion potential of this concrete mixture decreases compared to concrete without fly ash. From the result, it can be summarized that concrete mixture with 70% of OPC (Ordinary Portland Cement and 30% fly ash has shown the best corrosion resistance.

  5. Przyczyny braku kontroli astmy oskrzelowej na podstawie literatury = Reasons for lack of asthma control based on the literature

    Directory of Open Access Journals (Sweden)

    Katarzyna Dońka

    2015-01-01

    Uniwersytet Kazimierza Wielkiego w Bydgoszczy, Wydział Kultury Fizycznej, Zdrowia i Turystyki       Streszczenie   Brak kontroli astmy oskrzelowej najczęściej spowodowany jest nieprzestrzeganiem przez pacjentów zaleceń lekarskich (noncompliance. Trudności w kontroli astmy zwiększają prawdopodobieństwo wystąpienia stanu astmatycznego. Pacjenci z astmą niekontrolowaną korzystają częściej z wizyt lekarskich, są częściej hospitalizowani i częściej trafiają na Szpitalny Oddział Ratunkowy. Rozwiązaniem tego problemu jest objęcie pacjentów programem szkoleniowym dotyczącym terapii astmy i możliwości kontroli choroby.   Słowa kluczowe: astma oskrzelowa, kontrola choroby, przyczyny braku kontroli astmy.   Abstract   Lack of control of asthma is most often caused by failure patients' medical recommendations (noncompliance. The difficulties in the control of asthma, increase the likelihood of status asthmaticus. Patients with uncontrolled asthma often use the visits, they are more often hospitalized and more likely to get on Hospital Emergency Ward. The solution to this problem is to extend patient training program on asthma therapy and the ability to control the disease.   Keywords: asthma, diabetes control, reasons for the lack of asthma control.

  6. Solubility and acid-base properties of concentrated phytate in self-medium and in NaCl{sub aq} at T = 298.15 K

    Energy Technology Data Exchange (ETDEWEB)

    Cigala, Rosalia Maria; Crea, Francesco; Lando, Gabriele; Milea, Demetrio [Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Universita di Messina, Via Ferdinando Stagno d' Alcontres, 31, I-98166 Messina (Vill. S. Agata) (Italy); Sammartano, Silvio, E-mail: ssammartano@unime.i [Dipartimento di Chimica Inorganica, Chimica Analitica e Chimica Fisica, Universita di Messina, Via Ferdinando Stagno d' Alcontres, 31, I-98166 Messina (Vill. S. Agata) (Italy)

    2010-11-15

    The acid-base properties of concentrated phytic acid were studied in self-medium and in NaCl{sub aq} (0.5 {<=} I/mol . L{sup -1} {<=} 4.0) by ISE-H{sup +} potentiometry and by direct calorimetry, at T = 298.15 K. At ligand concentrations c{sub (Phy)} > 0.012 mol . L{sup -1}, the formation of several binuclear H{sub i}(Phy){sub 2} (2 {<=} i {<=} 10) species was observed, in addition to the mononuclear H{sub i}Phy (1 {<=} i {<=} 7) ones. The solubility of phytate dodecasodium salt was studied in pure water and in NaCl{sub aq} at different ionic strengths; the total solubility in pure water is S{sub 0}{sup T}=(0.300{+-}0.004)mol.L{sup -1} and it decreases markedly with increasing ionic strength; for example the total solubility of Na{sub 12}Phy at I = 3.0 mol . L{sup -1} is 0.008 mol . L{sup -1}. By the dependence on ionic strength (salt concentration) of the solubility, it was possible to calculate the activity coefficients of phytate as a function of medium concentration. Direct calorimetric titrations were also carried out on Na{sub 12}Phy aqueous solutions at different phytate concentrations (0.025 {<=} c{sub (Phy)}/mol . L{sup -1} {<=} 0.100) and without addition of supporting electrolyte, in order to calculate the enthalpy changes for the protonation equilibria in self-medium of the binuclear H{sub i}(Phy){sub 2} species, at T = 298.15 K. It was observed that the {Delta}H/kJ . mol{sup -1} of the binuclear species are, within the experimental error, independent of the ionic strength; for example for the H{sub 2}(Phy){sub 2} species we obtained: {Delta}H{sub 22} = (-23.6 {+-} 0.6) kJ . mol{sup -1}, and (-23.7 {+-} 0.2) kJ . mol{sup -1} at I = 0.50 and 2.0 mol . L{sup -1}, respectively.

  7. As necessidades e os desejos na formação discursiva do marketing: base consistente ou retórica legitimadora?

    Directory of Open Access Journals (Sweden)

    Vinícius Andrade Brei

    Full Text Available Neste artigo realizamos uma análise crítica da gênese histórica da área de marketing até sua constituição atual, com um foco principal: verificar se as necessidades e os desejos dos clientes são base consistente da formação histórica, discursiva, do marketing ou, apenas, retórica legitimadora para a atuação da área. Adotamos uma orientação filosófico-epistemológica baseada na teoria do discurso proposta por Michel Foucault, que nos permitiu constatar que a centralidade das necessidades e dos desejos dos clientes no discurso contemporâneo do marketing é resultado de uma série de transformações e disputas históricas pela hegemonia de uma determinada idéia ou ponto de vista, mas sempre ancorada em condições socioeconômicas, ambientais, favoráveis às transformações ocorridas. Em outras palavras, concluímos que as transformações discursivas, constituintes da área, foram o resultado de um processo produzido social e historicamente, tendo ocorrido muito mais como um resultado de mudanças na economia e no mundo empresarial do que como uma espécie de "vocação" natural do marketing.

  8. GPU-based low-level trigger system for the standalone reconstruction of the ring-shaped hit patterns in the RICH Cherenkov detector of NA62 experiment

    International Nuclear Information System (INIS)

    Ammendola, R.; Biagioni, A.; Cretaro, P.; Frezza, O.; Cicero, F. Lo; Lonardo, A.; Martinelli, M.; Paolucci, P.S.; Pastorelli, E.; Chiozzi, S.; Ramusino, A. Cotta; Fiorini, M.; Gianoli, A.; Neri, I.; Lorenzo, S. Di; Fantechi, R.; Piandani, R.; Pontisso, L.; Lamanna, G.; Piccini, M.

    2017-01-01

    This project aims to exploit the parallel computing power of a commercial Graphics Processing Unit (GPU) to implement fast pattern matching in the Ring Imaging Cherenkov (RICH) detector for the level 0 (L0) trigger of the NA62 experiment. In this approach, the ring-fitting algorithm is seedless, being fed with raw RICH data, with no previous information on the ring position from other detectors. Moreover, since the L0 trigger is provided with a more elaborated information than a simple multiplicity number, it results in a higher selection power. Two methods have been studied in order to reduce the data transfer latency from the readout boards of the detector to the GPU, i.e., the use of a dedicated NIC device driver with very low latency and a direct data transfer protocol from a custom FPGA-based NIC to the GPU. The performance of the system, developed through the FPGA approach, for multi-ring Cherenkov online reconstruction obtained during the NA62 physics runs is presented.

  9. A New Approach for the Determination of Dose Rate and Radioactivity for Detected Gamma Nuclides Using an Environmental Radiation Monitor Based on an NaI(Tl) Detector.

    Science.gov (United States)

    Ji, Young-Yong; Kim, Chang-Jong; Lim, Kyo-Sun; Lee, Wanno; Chang, Hyon-Sock; Chung, Kun Ho

    2017-10-01

    To expand the application of dose rate spectroscopy to the environment, the method using an environmental radiation monitor (ERM) based on a 3' × 3' NaI(Tl) detector was used to perform real-time monitoring of the dose rate and radioactivity for detected gamma nuclides in the ground around an ERM. Full-energy absorption peaks in the energy spectrum for dose rate were first identified to calculate the individual dose rates of Bi, Ac, Tl, and K distributed in the ground through interference correction because of the finite energy resolution of the NaI(Tl) detector used in an ERM. The radioactivity of the four natural radionuclides was then calculated from the in situ calibration factor-that is, the dose rate per unit curie-of the used ERM for the geometry of the ground in infinite half-space, which was theoretically estimated by Monte Carlo simulation. By an intercomparison using a portable HPGe and samples taken from the ground around an ERM, this method to calculate the dose rate and radioactivity of four nuclides using an ERM was experimentally verified and finally applied to remotely monitor them in real-time in the area in which the ERM had been installed.

  10. Design of a cement-based formulation for the conditioning of a NaNO3-rich intermediate-level long-lived radioactive effluent using a surrogate

    International Nuclear Information System (INIS)

    Coppens, E.; Antonucci, P.; Cau dit Coumes, C.

    2015-01-01

    Since the immobilization of concentrates in a bituminous matrix has been abandoned in Belgium in the late nineties, CEA and ONDRAF/NIRAS recently started developing an alternative conditioning technique for a historic radioactive effluent, rich in NaNO 3 . Multiple ways of treatment - in the domain of homogeneous cementation - were tested on a non-radioactive simulant of this aqueous waste stream, but due to its very low pH (∼ 0), the solution has to be neutralized to a higher pH in order to make it more compatible with general hydraulic binders. Therefore the research started by looking for a suitable base (i.e. KOH, NaOH or Ca(OH) 2 ) to neutralize the stream. Due to the formation of a viscous gel in different pH-domains, the resulting neutralization curve was separated in multiple areas of interest, i.e. those areas resulting in a highly liquid, water-like product. Only in a next step the research focused on selecting a suitable hydraulic binder (e.g. OPC, blended cement (OPC / blast-furnace slag with high contents of slag), KOH-activated slag, Fondu calcium aluminate cement). In a third step, two final formulations were established taking into account the specifications for grout implementation at industrial scale and further management of the waste packages. (authors)

  11. Heavy-metal extraction from sewage sludge using phosphorous-based salts: optimization process with Na2H2P2O7.

    Science.gov (United States)

    Navarro-González, Milagros; Ortega-López, Vanesa; Lópéz-Fernández, Juana I; Amo-Salas, Mariano; González-Carcedo, Salvador

    2017-09-01

    Land application is one of the important disposal alternatives for sewage sludge, but availability of potential toxic metals often restricts its uses. Three phosphorous-based salts (Na 2 H 2 P 2 O 7 , K 4 P 2 O 7 , KH 2 PO 4 ) were studied as potential metal extractants. The conclusions of the research were that greater extractive efficiency is achieved through a 30-min process of vertical shaking with disodium diacid pyrophosphate - Na 2 H 2 P 2 O 7 - at a concentration of 0.2 M at pH 2. Alternatively, the optimized process with oscillating shaking equipment would require 60 min. In both cases the average of set of extracted metals is around 50%. A second extraction process with potassium pyrophosphate - K 4 P 2 O 7 at pH 6 achieved the reduction of further total amounts of metal, upper 65% with respect to the initial content. In this way the sludge could be used in land applications, with restrictions on each soil, according to the limit values specified in the future regulations.

  12. Detección de Leishmania spp. en base al gen que codifica la proteína HSP20

    Directory of Open Access Journals (Sweden)

    Ana M Montalvo

    Full Text Available Objetivos. Explorar una nueva diana para el diagnóstico molecular de Leishmania. Materiales y métodos. Se evaluó la utilidad del gen que codifica la proteína de choque térmico de 20kDa (hsp20 para la detección de Leishmania por medio de la reacción en cadena de la polimerasa (PCR.Se normalizó la PCR y se determinaron los parámetros analíticos, así como la validez y seguridad diagnóstica y la concordancia con la PCR-18S. Se evaluó la PCR-hsp20 con ADN obtenido de un grupo de muestras clínicas de distinta procedencia. Resultados. Los parámetros analíticos resultaron adecuados. La sensibilidad obtenida fue de 86% y la especificidad del 100%, la concordancia con el método de referencia resultó buena (κ = 0,731, lo que apoya su posible uso para el diagnóstico. La posibilidad de identificación posterior de la especie mediante secuenciación del producto amplificado le confiere una ventaja adicional. Conclusiones. Se demuestra la utilidad de este gen como una nueva diana para la detección del género Leishmania. Debido a su potencial, se recomienda mejorar la sensibilidad del procedimiento y realizar su evaluación en diversas regiones endémicas.

  13. Leakage current phenomena in Mn-doped Bi(Na,K)TiO_3-based ferroelectric thin films

    International Nuclear Information System (INIS)

    Walenza-Slabe, J.; Gibbons, B. J.

    2016-01-01

    Mn-doped 80(Bi_0_._5Na_0_._5)TiO_3-20(Bi_0_._5K_0_._5)TiO_3 thin films were fabricated by chemical solution deposition on Pt/TiO_2/SiO_2/Si substrates. Steady state and time-dependent leakage current were investigated from room temperature to 180 °C. Undoped and low-doped films showed space-charge-limited current (SCLC) at high temperatures. The electric field marking the transition from Ohmic to trap-filling-limited current increased monotonically with Mn-doping. With 2 mol. % Mn, the current was Ohmic up to 430 kV/cm, even at 180 °C. Modeling of the SCLC showed that all films exhibited shallow trap levels and high trap concentrations. In the regime of steady state leakage, there were also observations of negative differential resistivity and positive temperature coefficient of resistivity near room temperature. Both of these phenomena were confined to relatively low temperatures (below ∼60 °C). Transient currents were observed in the time-dependent leakage data, which was measured out to several hundred seconds. In the undoped films, these were found to be a consequence of oxygen vacancy migration modulating the electronic conductivity. The mobility and thermal activation energy for oxygen vacancies was extracted as μ_i_o_n ≈ 1.7 × 10"−"1"2 cm"2 V"−"1 s"−"1 and E_A_,_i_o_n ≈ 0.92 eV, respectively. The transient current displayed different characteristics in the 1 mol. % Mn-doped films which were not readily explained by oxygen vacancy migration.

  14. Filmes compostos biodegradáveis a base de amido de mandioca e proteína de soja

    Directory of Open Access Journals (Sweden)

    Geisa Oliveira Rocha

    2014-10-01

    Full Text Available Filmes provenientes de biopolímeros (polissacarídeos e proteínas apresentam-se como alternativa ao uso de derivados petroquímicos, possibilitando a formação de matrizes contínuas, e a otimização de parâmetros como pH e tipo de plastificante pode resultar em materiais com propriedades melhoradas. Neste estudo, filmes de amido de mandioca produzidos por casting foram avaliados quanto a adição de extrato proteico de soja (EPS, glicerol e pH do meio. O aumento da concentração de EPS levou ao escurecimento dos filmes, ao aumento da solubilidade e aumentou o pH. O maior teor de plastificante e o menor pH elevaram a permeabilidade ao vapor de água (PVA. A menor PVA (0,057 g mm h-1 m-2 kPa-1 foi obtida com máximo teor de EPS (47% e 13% de glicerol em pH 12. A força de perfuração variou de 0,08 a 2,78 N, sendo os maiores valores com adição de EPS e glicerol em nível intermediário (30% em pH neutro. A maior deformação na perfuração (31,9% ocorreu no teor de EPS mais baixo (13% e de glicerol mais alto (47%. Considerando-se os fatores desejáveis: baixa PVA, baixa solubilidade e boa resistência mecânica, os filmes produzidos com 15,2% de EPS, 29,2% de glicerol em pH 6,1 foram os que mais bem atenderam a estas características.

  15. Evaluation of spatial dependence of point spread function-based PET reconstruction using a traceable point-like 22Na source

    Directory of Open Access Journals (Sweden)

    Taisuke Murata

    2016-10-01

    Full Text Available Abstract Background The point spread function (PSF of positron emission tomography (PET depends on the position across the field of view (FOV. Reconstruction based on PSF improves spatial resolution and quantitative accuracy. The present study aimed to quantify the effects of PSF correction as a function of the position of a traceable point-like 22Na source over the FOV on two PET scanners with a different detector design. Methods We used Discovery 600 and Discovery 710 (GE Healthcare PET scanners and traceable point-like 22Na sources (<1 MBq with a spherical absorber design that assures uniform angular distribution of the emitted annihilation photons. The source was moved in three directions at intervals of 1 cm from the center towards the peripheral FOV using a three-dimensional (3D-positioning robot, and data were acquired over a period of 2 min per point. The PET data were reconstructed by filtered back projection (FBP, the ordered subset expectation maximization (OSEM, OSEM + PSF, and OSEM + PSF + time-of-flight (TOF. Full width at half maximum (FWHM was determined according to the NEMA method, and total counts in regions of interest (ROI for each reconstruction were quantified. Results The radial FWHM of FBP and OSEM increased towards the peripheral FOV, whereas PSF-based reconstruction recovered the FWHM at all points in the FOV of both scanners. The radial FWHM for PSF was 30–50 % lower than that of OSEM at the center of the FOV. The accuracy of PSF correction was independent of detector design. Quantitative values were stable across the FOV in all reconstruction methods. The effect of TOF on spatial resolution and quantitation accuracy was less noticeable. Conclusions The traceable 22Na point-like source allowed the evaluation of spatial resolution and quantitative accuracy across the FOV using different reconstruction methods and scanners. PSF-based reconstruction reduces dependence of the spatial resolution on the

  16. De la geoquimica al paisaje: composicion elemental de los suelos

    NARCIS (Netherlands)

    Martinez-Cortizas, A.; Costa-Casais, M.; Kaal, J.; Ferro-Vazquez, C.; Pontevedra-Pombal, X.; Viveen, W.

    2013-01-01

    El objeto de este libro es el estudio del arte rupestre en la Edad de Bronce hasta la Edad del Hierro en Campo Lameiro (Pontevedra, Galicia), en el que se ha combinado la metodología arqueológica, histórica, etnográfica y paleoambitental, para completar el contexto arqueológico de los petroglifos

  17. Estudo dos modelos de avaliação de empresas com base na metodologia do fluxo de caixa descontado: estudo de caso

    Directory of Open Access Journals (Sweden)

    Valter Saurin

    2007-05-01

    Full Text Available Na metodologia de avaliação de empresas com base no Fluxo de Caixa Descontado, têm-se os seguintes métodos: o Fluxo de Caixa Operacional Disponível, o Valor Presente Ajustado, o Fluxo de Caixa do Capital Próprio. Cada modelo tem suas características e fornece uma informação diferenciada, mas teoricamente devem proporcionar resultados financeiros equivalentes, se for empregada à mesma base de dados. O objetivo deste trabalho foi verificar se com o emprego da mesma base de dados, os três métodos indicados com base no Fluxo de Caixa Descontado, proporcionam resultados equivalentes ou se existem conflitos metodológicos entre os mesmos, com base em estudo de caso real. Os resultados mostraram diferenças significativas entre os três valores e entre estes e o preço de venda da empresa em questão.

  18. Production of barium molybdate and tungstate on the base of ternary reciprocal Na, Ba long Cl, EhO4 (Eh - Mo, W) systems

    International Nuclear Information System (INIS)

    Garkushin, I.K.; Sechnoj, A.I.; Dibirov, M.A.; Trunin, A.S.

    1984-01-01

    Possibilities of the syntnesis of barium molybdate and tungstate on the base of ternary reciprocal Na, Ba parallel Cl, EhO 4 (Eh=Mo, W) system state diagrams are under study. It is shown that on the basis of these reciprocal state diagrams syntnesis of not only BaO 4 but also of other suhstances is possible. Purity of obtained chemical agents is basically dependent on qualification of initial components. Synthesis temperature is decreased and time is reduced as compared to other known methods. For substance synthesis, state diagrams examination (reaction type confirmation and component crystallization fields separation from compound crystallization fields) is necessary along with the calculation of the conventional thermochemical effect

  19. Accurate thermometry based on the red and green fluorescence intensity ratio in NaYF4: Yb, Er nanocrystals for bioapplication.

    Science.gov (United States)

    Liu, Lixin; Qin, Feng; Lv, Tianquan; Zhang, Zhiguo; Cao, Wenwu

    2016-10-15

    A biological temperature measurement method based on the fluorescence intensity ratio (FIR) was developed to reduce uncertainty. The upconversion luminescence of NaYF4:Yb, Er nanocrystals was studied as a function of temperature around the physiologically relevant range of 300-330 K. We found that the green-green FIR Fe and red-green FIR (I660/I540) varied linearly as temperature increased. The thermometric uncertainties using the two FIRs were discussed and were determined to be almost constant at 0.6 and 0.09 K for green-green and red-green, respectively. The lower thermometric uncertainty comes from the intense signal-to-noise ratio of the measured FIRs owing to their comparable fluorescence intensities.

  20. Performance and advantages of a soft-core based parallel architecture for energy peak detection in the calorimeter Level 0 trigger for the NA62 experiment at CERN

    International Nuclear Information System (INIS)

    Ammendola, R.; Barbanera, M.; Bizzarri, M.; Bonaiuto, V.; Ceccucci, A.; Simone, N. De; Fantechi, R.; Fucci, A.; Lupi, M.; Ryjov, V.; Checcucci, B.; Papi, A.; Piccini, M.; Federici, L.; Paoluzzi, G.; Salamon, A.; Salina, G.; Sargeni, F.; Venditti, S.

    2017-01-01

    The NA62 experiment at CERN SPS has started its data-taking. Its aim is to measure the branching ratio of the ultra-rare decay K +  → π + ν ν̅ . In this context, rejecting the background is a crucial topic. One of the main background to the measurement is represented by the K +  → π + π 0  decay. In the 1-8.5 mrad decay region this background is rejected by the calorimetric trigger processor (Cal-L0). In this work we present the performance of a soft-core based parallel architecture built on FPGAs for the energy peak reconstruction as an alternative to an implementation completely founded on VHDL language.

  1. Performance and advantages of a soft-core based parallel architecture for energy peak detection in the calorimeter Level 0 trigger for the NA62 experiment at CERN

    Science.gov (United States)

    Ammendola, R.; Barbanera, M.; Bizzarri, M.; Bonaiuto, V.; Ceccucci, A.; Checcucci, B.; De Simone, N.; Fantechi, R.; Federici, L.; Fucci, A.; Lupi, M.; Paoluzzi, G.; Papi, A.; Piccini, M.; Ryjov, V.; Salamon, A.; Salina, G.; Sargeni, F.; Venditti, S.

    2017-03-01

    The NA62 experiment at CERN SPS has started its data-taking. Its aim is to measure the branching ratio of the ultra-rare decay K+ → π+ν ν̅ . In this context, rejecting the background is a crucial topic. One of the main background to the measurement is represented by the K+ → π+π0 decay. In the 1-8.5 mrad decay region this background is rejected by the calorimetric trigger processor (Cal-L0). In this work we present the performance of a soft-core based parallel architecture built on FPGAs for the energy peak reconstruction as an alternative to an implementation completely founded on VHDL language.

  2. Os fundamentos da identidade européia na antiguidade, na idade média e nos tempos modernos = The bases of European identity in antiquity, middle ages and in modernity

    Directory of Open Access Journals (Sweden)

    Peter Johann Mainka

    2011-01-01

    Full Text Available Depois do fim da Segunda Guerra Mundial iniciou-se o processo da unificação européia, compreendendo todas as áreas do Estado e da sociedade (legislação, jurisdição, política, economia, instituições, etc. dos 27 Estados, tão diferentes quanto às tradições e à sua história, que compõem, no momento, a União Européia. Porém, quais são os fundamentos intelectuais e os valores culturais, quais são as idéias e memórias, que dão à Europa uma identidade coerente e compartilhada, em princípio, por toda a população européia de atualmente, quase 500 milhões de pessoas? Esses alicerces intelectuais da Europa remontam à Antiguidade, à Idade Média e aos Tempos Modernos. Este trabalho pretende apresentar alguns desses fundamentos comuns da Europa, postos na Idade Média e nos Tempos Modernos (por exemplo o Cristianismo, o Humanismo e o Iluminismo, e discutir a sua importância para a identidade européia.The process of European unification started immediately after the II World War. It comprised all the areas of State and society (legislation, jurisdiction, politics, economy, institutions and others in the twenty-seven countries, highly different in their traditions and history and which now make up the European Community. Which are the intellectual bases and the cultural values, which are the ideas and memories that give Europe a coherent identity shared, at least theoretically, by the European population of approximately 500 million people? Europe's intellectual bases go back to Antiquide, to the Middle Ages and to Modernity. Current essay will provide some of Europe's common principles posited in the Middle Ages and in Modernity (for instance, Christianity, Humanism and Illuminism and will discuss their importance within Euopean identity.

  3. REVESTIMENTO COMESTÍVEL À BASE DE GOMA XANTANA, COMPOSTOS LIPOFÍLICOS E/OU CLORETO DE CÁLCIO NA CONSERVAÇÃO DE MORANGOS

    Directory of Open Access Journals (Sweden)

    BIANCA SÁVIA FERREIRA LEITE

    2015-12-01

    Full Text Available RESUMO Objetivou-se com este estudo avaliar revestimentos comestíveis à base de goma xantana e glicerol, combinada a cloreto de cálcio, ácido oleico e/ou óleo essencial de hortelã-pimenta na conservação de morangos cv. Festival. Os morangos foram selecionados, lavados, sanitizados e, a seguir, submetidos a diferentes tratamentos de revestimentos à base de goma xantana acrescidos de glicerol, cloreto de cálcio, ácido oleico e/ou óleo essencial de hortelã-pimenta. Os frutos foram secos sob ventilação forçada a 4 ºC, por 15 h, e, posteriormente, embalados em bandejas com tampa de Polietileno Tereftalato (PET e armazenados a 4 ºC, durante 12 dias. Foram realizadas análises de perda de massa, firmeza, luminosidade, tonalidade, pH, acidez, sólidos solúveis totais, antocianinas e a incidência de deterioração fúngica. Os diferentes revestimentos utilizados foram eficientes na conservação dos morangos. O tratamento com goma xantana e glicerol apresentou os melhores resultados, pois a influência do ácido oleico ou do óleo essencial de hortelãpimenta, assim como do cloreto de cálcio, não foi significativa. O revestimento de goma xantana proporcionou redução da perda de massa, manutenção da firmeza, cor, pH, acidez, sólidos solúveis totais, antocianinas e não estimulou o crescimento fúngico. Desta forma, esta goma apresenta potencial para aplicação como revestimento em morangos, visando a maximizar a vida útil deste produto.

  4. Na+-stimulated ATPase of alkaliphilic halotolerant cyanobacterium Aphanothece halophytica translocates Na+ into proteoliposomes via Na+ uniport mechanism

    Directory of Open Access Journals (Sweden)

    Soontharapirakkul Kanteera

    2010-08-01

    Full Text Available Abstract Background When cells are exposed to high salinity conditions, they develop a mechanism to extrude excess Na+ from cells to maintain the cytoplasmic Na+ concentration. Until now, the ATPase involved in Na+ transport in cyanobacteria has not been characterized. Here, the characterization of ATPase and its role in Na+ transport of alkaliphilic halotolerant Aphanothece halophytica were investigated to understand the survival mechanism of A. halophytica under high salinity conditions. Results The purified enzyme catalyzed the hydrolysis of ATP in the presence of Na+ but not K+, Li+ and Ca2+. The apparent Km values for Na+ and ATP were 2.0 and 1.2 mM, respectively. The enzyme is likely the F1F0-ATPase based on the usual subunit pattern and the protection against N,N'-dicyclohexylcarbodiimide inhibition of ATPase activity by Na+ in a pH-dependent manner. Proteoliposomes reconstituted with the purified enzyme could take up Na+ upon the addition of ATP. The apparent Km values for this uptake were 3.3 and 0.5 mM for Na+ and ATP, respectively. The mechanism of Na+ transport mediated by Na+-stimulated ATPase in A. halophytica was revealed. Using acridine orange as a probe, alkalization of the lumen of proteoliposomes reconstituted with Na+-stimulated ATPase was observed upon the addition of ATP with Na+ but not with K+, Li+ and Ca2+. The Na+- and ATP-dependent alkalization of the proteoliposome lumen was stimulated by carbonyl cyanide m - chlorophenylhydrazone (CCCP but was inhibited by a permeant anion nitrate. The proteoliposomes showed both ATPase activity and ATP-dependent Na+ uptake activity. The uptake of Na+ was enhanced by CCCP and nitrate. On the other hand, both CCCP and nitrate were shown to dissipate the preformed electric potential generated by Na+-stimulated ATPase of the proteoliposomes. Conclusion The data demonstrate that Na+-stimulated ATPase from A. halophytica, a likely member of F-type ATPase, functions as an electrogenic Na

  5. Desenvolvimento de um titulador baseado na contagem de gotas Development of a titrator based on drop counting

    OpenAIRE

    André Fernando Oliveira; Alexandre Correa Lima; Astréa F. Souza Silva; Rodrigo de Maio Almeida

    2010-01-01

    TitDrop II, a practice low-cost titrator based on drop counting is proposed. A microcomputer counts drops in an opto-switch and it receives pH values from a commercial pHmeter with RS-232 serial port. The volume of drops must kept constant and the amount of base in each drop is obtained by standardization in the titrator. A linear behavior between height of reservoir of titrant and drop frequency was observed, but there is no influence of low height on drop volume. Acetic acidity in samples o...

  6. Application of gamma irradiation on forming protein-based edible films; Aplicacao da irradiacao na formacao de filmes comestiveis proteicos

    Energy Technology Data Exchange (ETDEWEB)

    Sabato, Susy Frey

    2000-07-01

    In the last decade considerable interest has been addressed to the development of protein-based edible films due to their application in the food industry, as a substitute to traditional plastic films. The use of soy and whey proteins to form those films has been investigated, using heat, chemical and enzymatic processes. Gamma irradiation was recently reported to form caseinate-based edible films, due to the increase of the cohesive strength of the proteins by the formation of cross-links. This work aimed to verify the role of the gamma irradiation in the process of forming edible films from soy protein isolate (SPI) alone and in complex mixtures, that is, mixed with whey protein isolate (WPI), with carbethoxymethyl cellulose (CMC) and with poly(vinyl)alcohol (PVA). Gamma irradiation treatment improved significantly the mechanical properties for all films. The mechanical behavior is strongly related to the formulation, showing synergy between the gamma irradiation and the CMC, mainly for SPI-based films. SPI-based films presented a trend to decrease the water vapor permeability values when irradiated. The CMC addition showed significant improvements on the permeability for films from SPI and from the mixture of SPI with WPI. (author)

  7. A influência da estrutura sociorrelacional do empreendedor na capacidade inovativa de empresas incubadas de base tecnológica

    Directory of Open Access Journals (Sweden)

    Valmir Emill Hoffmann

    2016-06-01

    Full Text Available O objetivo desse trabalho é avaliar as influências das interações sociais dos empreendedores na capacidade de inovação das empresas em uma incubadora de base tecnológica. O processo inovação organizacional pode sofrer influências positivas quando o gestor possui habilidade em unir conhecimentos complementares e entender o processo de interação com outras organizações. Assim, analisou-se a estrutura sociorrelacional dos empreendedores, de maneira a vincular o poder das conexões dos atores à sua capacidade de inovação. Para o alcance dos objetivos propostos foram aplicados dois questionários com 33 empresários de 12 empresas incubadas e 3 diretores da incubadora: um baseado na Pesquisa Nacional de Inovação do Brasil (PINTEC e outro para mensuração das relações interpessoais Foram obtidos 12 questionários válidos de cada escala. As variáveis de interação social foram correlacionadas com as do processo de inovação. Os resultados demonstram que as interações sociais apresentam relação significativa com (a número de colaboradores, (b satisfação com o processo de incubação, (c compra de serviços de P&D, (d fontes de informação e (e inovações organizacionais e de marketing. As limitações deste trabalho constituem-se na amostra reduzida a uma única instituição. Para futuras investigações, sugere-se a utilização de outras medidas de desempenho de inovação, a replicação da pesquisa a outras incubadoras e com outras startups não incubadas

  8. Methane explosion suppression characteristics based on the NaHCO3/red-mud composite powders with core-shell structure.

    Science.gov (United States)

    Wang, Yan; Cheng, Yi-Shen; Yu, Ming-Gao; Li, Yao; Cao, Jian-Liang; Zheng, Li-Gang; Yi, Hong-Wei

    2017-08-05

    The NaHCO 3 /red-mud (RM) composite powders were successfully prepared by the solvent-anti-solvent method for methane explosion suppression. The RM was used as a carrier, and the NaHCO 3 was used as a loaded inhibitor. The NaHCO 3 /RM composite powders showed a special core-shell structure and excellent endothermic performance. The suppression properties of NaHCO 3 /RM composite for 9.5% CH 4 explosion were tested in a 20L spherical explosion vessel and a 5L Perspex duct. The results showed that the NaHCO 3 /RM composite powders displayed a much better suppression property than the pure RM or NaHCO 3 powders. The loading amount of NaHCO 3 has an intensive influence on the inhibition property of NaHCO 3 /RM composite powders. The best loaded content of NaHCO 3 is 35%. It exhibited significant inhibitory effect that the explosion max-pressure declined 44.9%, the max-pressure rise rate declined 96.3% and the pressure peak time delayed 366.7%, respectively. Copyright © 2017 Elsevier B.V. All rights reserved.

  9. Essential role of the electroneutral Na+-HCO3- cotransporter NBCn1 in murine duodenal acid-base balance and colonic mucus layer build-up in vivo.

    Science.gov (United States)

    Singh, Anurag Kumar; Xia, Weiliang; Riederer, Brigitte; Juric, Marina; Li, Junhua; Zheng, Wen; Cinar, Ayhan; Xiao, Fang; Bachmann, Oliver; Song, Penghong; Praetorius, Jeppe; Aalkjaer, Christian; Seidler, Ursula

    2013-04-15

    Duodenal epithelial cells need efficient defence strategies during gastric acidification of the lumen, while colonic mucosa counteracts damage by pathogens by building up a bacteria-free adherent mucus layer. Transport of HCO3(-) is considered crucial for duodenal defence against acid as well as for mucus release and expansion, but the transport pathways involved are incompletely understood. This study investigated the significance of the electroneutral Na(+)-HCO3(-) cotransporter NBCn1 for duodenal defence against acid and colonic mucus release. NBCn1 was localized to the basolateral membrane of duodenal villous enterocytes and of colonic crypt cells, with predominant expression in goblet cells. Duodenal villous enterocyte intracellular pH was studied before and during a luminal acid load by two-photon microscopy in exteriorized, vascularly perfused, indicator (SNARF-1 AM)-loaded duodenum of isoflurane-anaesthetized, systemic acid-base-controlled mice. Acid-induced HCO3(-) secretion was measured in vivo by single-pass perfusion and pH-stat titration. After a luminal acid load, NBCn1-deficient duodenocytes were unable to recover rapidly from intracellular acidification and could not respond adequately with protective HCO3(-) secretion. In the colon, build-up of the mucus layer was delayed, and a decreased thickness of the adherent mucus layer was observed, suggesting that basolateral HCO3(-) uptake is essential for optimal release of mucus. The electroneutral Na(+)-HCO3(-) cotransporter NBCn1 displays a differential cellular distribution in the murine intestine and is essential for HCO3(-)-dependent mucosal protective functions, such as recovery of intracellular pH and HCO3(-) secretion in the duodenum and secretion of mucus in the colon.

  10. Desenvolvimento de um titulador baseado na contagem de gotas Development of a titrator based on drop counting

    Directory of Open Access Journals (Sweden)

    André Fernando Oliveira

    2010-01-01

    Full Text Available TitDrop II, a practice low-cost titrator based on drop counting is proposed. A microcomputer counts drops in an opto-switch and it receives pH values from a commercial pHmeter with RS-232 serial port. The volume of drops must kept constant and the amount of base in each drop is obtained by standardization in the titrator. A linear behavior between height of reservoir of titrant and drop frequency was observed, but there is no influence of low height on drop volume. Acetic acidity in samples of vinager was compared with volumetric titration, and deviation between -2.6 to 3.9% was observed.

  11. BASES TEÓRICAS DE PENSAMENTO CRÍTICO NA ENFERMAGEM IBEROAMERICANA: REVISÃO INTEGRATIVA DA LITERATURA

    Directory of Open Access Journals (Sweden)

    Silvana Ceolin

    2017-01-01

    Full Text Available Objetivo: identificar las bases teóricas que fundamentan los conceptos de pensamiento crítico en la enfermería iberoamericana en los últimos diez años. Método: revisión integrativa de literatura realizada en las bases de datos PubMed, CUIDEN y SciELO, entre 2006 y 2015, con las palabras clave enfermería y pensamiento crítico. Resultados: se incluyeron 32 estudios, que revelaron la presencia de nueve pensadores como bases teóricas del concepto de pensamiento crítico. Se constató que no hay uniformidad para la definición del concepto. Sin embargo, se diferencian dos concepciones de pensamiento crítico entre los autores, que se organizaron en dos grupos. El grupo A, compuesto por Alfaro-Lefevre, Peter Facione, Scheffer y Rubenfeld, Richard Paul, que comprenden que el pensamiento crítico implica habilidades para el razonamiento clínico y el diagnóstico, esencial para la toma de decisiones, y el grupo B, constituido por John Dewey, Donald Schön, Paulo Freire y Jürgen Habermas, que entienden el pensamiento crítico como un proceso activo y reflexivo, orientado al desarrollo de la conciencia crítica. Estos pensadores fueron la base para la propuesta de instrumentos de evaluación del pensamiento, estrategias de enseñanza y un referencial teórico-metodológico para la enfermería. Conclusión: la perspectiva dinámica del grupo B fortalece el carácter dialéctico de la construcción del conocimiento, a partir del cual la enfermería tiene potencial de construirse como una ciencia social y práctica, comprometida con la transformación de realidades.

  12. LSI microprocessor circuit families based on integrated injection logic. Mikroprotsessornyye komplekty bis na osnove integral'noy inzhektsionnoy logiki

    Energy Technology Data Exchange (ETDEWEB)

    Borisov, V.S.; Vlasov, F.S.; Kaloshkin, E.P.; Serzhanovich, D.S.; Sukhoparov, A.I.

    1984-01-01

    Progress in developing microprocessor computer hardware is based on progress and improvement in systems engineering, circuit engineering and manufacturing process methods of design and development of large-scale integrated circuits (BIS). Development of these methods with widespread use of computer-aided design (CAD) systems has allowed developing 4- and 8-bit microprocessor families (MPK) of LSI circuits based on integrated injection logic (I/sup 2/L), characterized by relatively high speed and low dissipated power. The emergence of LSI and VLSI microprocessor circuits required computer system developers to make changes to theory and practice of computer system design. Progress in technology upset the established relation between hardware and software component development costs in systems being designed. A characteristic feature of using LSI circuits is also the necessity of building devices from standard modules with large functional complexity. The existing directions of forming compositions of LSI microprocessor families allow the system developer to choose a particular methodology of design, proceeding from the efficiency function and field of application of the system being designed. The efficiency of using microprocessor families is largely governed by the user's understanding in depth of the structure of LSI microprocessor family circuits and the features of using them to implement a broad class of computer devices and modules being developed. This book is devoted to solving this problem.

  13. Pobreza e indigência no Brasil: algumas evidências empíricas com base na PNAD 2004

    Directory of Open Access Journals (Sweden)

    Sonia Rocha

    2009-06-01

    Full Text Available This article presents income-based indicators using the data from the 2004 Brazilian National Household Survey regarding poverty  and indigence in 2004. It refers to spatial characteristics of poverty, as well as its relation with the functioning of the labor market and the  way family income is formed. The relativelysharp reduction in poverty and indigence from 2003 to 2004, the best result obtained since the Real Plan was implemented, constitutes the background for the analysis, although the impact of this reduction is spatially differentiated, more favorable in rural areas and less so in the São Paulo metropolitan area. The increase in family income is mainly due to the vigorous expansion of  occupation, as the average labor income remained unchanged. Nevertheless, poor  individuals benefited from the reduction in the returns to schooling, from the realincrease in the minimum wage and from the wider scope of the social security net, which resulted in a more vigorous income increase at the base of distribution, thus leading to a reduction in inequality.

  14. Pobreza e indigência no Brasil: algumas evidências empíricas com base na PNAD 2004

    Directory of Open Access Journals (Sweden)

    Sonia Rocha

    2006-08-01

    Full Text Available This article presents income-based indicators using the data from the 2004 Brazilian National Household Survey regarding poverty and indigence in 2004. It refers to spatial characteristics of poverty, as well as its relation with the functioning of the labor market and the way family income is formed. The relatively sharp reduction in poverty and indigence from 2003 to 2004, the best result obtained since the Real Plan was implemented, constitutes the background for the analysis, although the impact of this reduction is spatially differentiated, more favorable in rural areas and less so in the São Paulo metropolitan area. The increase in family income is mainly due to the vigorous expansion of occupation, as the average labor income remained unchanged. Nevertheless, poor individuals benefited from the reduction in the returns to schooling, from the real increase in the minimum wage and from the wider scope of the social security net, which resulted in a more vigorous income increase at the base of distribution, thus leading to a reduction in inequality.

  15. Growth of hexagonal NaGdF{sub 4} nanocrystals based on cubic Ln{sup 3+}: CaF{sub 2} precursors and the multi-color upconversion emissions

    Energy Technology Data Exchange (ETDEWEB)

    Lei, Lei; Chen, Daqin, E-mail: dqchen@fjirsm.ac.cn; Yu, Yunlong; Zhang, Rui; Ling, Hang; Xu, Ju; Huang, Feng; Wang, Yuansheng, E-mail: yswang@fjirsm.ac.cn

    2014-04-05

    Graphical abstract: We reported a novel hetero-valence cation exchange route to synthesize Ln: NaGdF4 upconversion nanocrystals for the first time. -- Highlights: • The Ln3+: NaGdF4 nanocrystals were synthesized based on the Ln3+: CaF2 precursors. • The microstructures of nanocrystals were characterized. • The multi-color upconversion emissions were easily realized. -- Abstract: Lanthanide-doped upconversion nanomaterials have attracted great attention recently for their potential applications in the fields of bio-label, three-dimensional display, solar cell and so on. In this article, we report a new strategy to prepare hexagonal Ln{sup 3+}:NaGdF{sub 4} upconversion nanocrystals. Unlike the routine way of synthesizing NaGdF{sub 4} nanocrystals through nucleation and growth, the formation of hexagonal NaGdF{sub 4} nanocrystals herein is realized based on the Ln{sup 3+}-doped cubic CaF{sub 2} precursors, following a hetero-valence cation exchange process between Gd{sup 3+}/Na{sup +} and Ca{sup 2+}. Evidently, Ln{sup 3+} dopants in the CaF{sub 2} precursors are retained in the finally formed hexagonal NaGdF{sub 4} nanocrystals and, subsequently, multi-color upconversion emissions are easily realized by simply adjusting the Ln{sup 3+} dopant species and contents in the CaF{sub 2} precursors. This novel hetero-valence cation exchange route may open up a new pathway to synthesize nanomaterials that cannot be fabricated directly.

  16. Ocena zmiany warunków hydrologicznych na terenach zurbanizowanych z wykorzystaniem technik GIS = GIS-based assessment of changes related to hydrological conditions in urban areas

    Directory of Open Access Journals (Sweden)

    Danuta Szumińska

    2015-05-01

    email: dszum@ukw.edu.pl1   Streszczenie   W artykule zaprezentowano możliwości wykorzystania technik GIS do przeprowadzenia analizy zmiany warunków hydrologicznych. Badania przeprowadzono na terenie zurbanizowanym, na którym dokonano zmian rzeźby oraz sposobu użytkowania terenu. Spowodowało to pojawieniem się problemów z odwodnieniem terenu, przede wszystkim w czasie wzmożonego zasilania z opadów deszczu i roztopów śniegu. W celu określenia przyczyn występujących problemów porównano rzeźbę terenu oraz wyznaczono kierunki odpływu wód powierzchniowych przed i po zagospodarowaniu działki d (Ryc. 1. Czasochłonne i kosztochłonne badania geologiczne wykonano w minimalnym zakresie (Tab. 1 i zostały one wykorzystane jako informacja uzupełniająca, pozwalająca na ocenę możliwości infiltracji wody w podłoże. Na podstawie przeprowadzonych badań stwierdzono, że główne przyczyny problemów z odwodnieniem terenu związane są ze stworzeniem barier w postaci podmurówek ogrodzeń zlokalizowanych prostopadle do kierunków odpływu wody (Fot. 1, Fot. 2. Zmiany rzeźby były w analizowanym przypadku czynnikiem mniej istotnym.   Słowa kluczowe: warunki hydrologiczne, infiltracja, model rzeźby terenu, kierunki odpływu, użytkowanie terenu, tereny zurbanizowane.   Abstract   The paper discusses the possibilities of employing GIS for conducting analysis of changes in hydrological conditions. The study was carried out in an urban area featuring altered relief and use of land. This caused problems with draining the terrain, particularly at times of increased rainwater and meltwater supply. In order to identify the causes of the occurring problems, we compared land relief prior and after the plot was developed, as well as indicated the directions of surface water runoff (Fig. 1. Time-consuming and expensive geological research activities were restricted to minimum (Tab. 2 and the data thus obtained were used as supplementary information to

  17. Active transport of Na+ by reconstituted Na,K-ATPase

    International Nuclear Information System (INIS)

    Boldyrev, A.A.; Svinukhova, I.A.

    1987-01-01

    The ability of ATP, CTP, ITP, GTP, and UTP to support ouabain-sensitive accumulation of Na + by proteoliposomes with a reconstituted Na/K-pump was investigated. At a low [Na + ]/[K + ] ratio in the medium (20 mM/50 mM), a correlation is observed between the proton-accepting capacity of the nucleotide and its effectiveness as a substrate of active transport. To test the hypothesis of the importance of the presence of a negative charge in the 1-position of the purine (3-pyrimidine) base of the nucleotide for mutual transitions between the Na- and K-conformations of Na,K-ATPase they used two analogs of ATP: N 1 -hydroxy-ATP, possessing proton acceptor capacity, and N 1 -methoxy-ATP, in the molecule of which the negative charge is quenched by a methyl group. The first substrate supports active accumulation of Na + in proteoliposomes at the same rate as ATP, whereas the second substrate is relatively ineffective

  18. A low-cost personal dosemeter based on optically stimulated luminescence (OSL) of common household salt (NaCl)

    International Nuclear Information System (INIS)

    Ekendahl, Daniela; Bulánek, Boris; Judas, Libor

    2016-01-01

    Salt represents a radiation sensitive material that can be used for dosimetry. The objective of this experimental study was to test a low-cost salt dosemeter that was designed for personnel that are not radiation workers, but can operate in low probability events resulting in a serious external radiation exposure. The dosemeter is based on use of optically stimulated luminescence (OSL) of a common household salt. Attention was concentrated on its energy and angular responses. The dosemeter was fixed to the ICRU slab phantom and irradiated by photons of reference radiation qualities (ISO 4037-1) with mean energies between 33 and 1250 keV. Angular response was investigated for angles of incidence from 0° to 80° for radiation qualities of N-150 (∼118 keV) and S-Cs (∼662 keV). Single-Aliquot Regenerative-dose analytical protocol was employed for dose reconstruction. The results were evaluated with respect to H_p(10) measurement. The salt dosemeter can provide reliable or reasonably conservative H_p(10) estimates in radiation fields where photon energies > 100 keV predominate, radiation incidence angles are from 0° to 80° and also for rotational geometry. Furthermore, a personal dose reconstruction trial was demonstrated. Relative deviation between the measured and reference H_p(10) values was 5.5%. A practical disadvantage of the method is the more demanding analytical protocol. - Highlights: • Common salt has a considerable potential for dosimetry based on use of OSL. • A simple salt personal dosemeter was designed and tested. • Photon energy and angular responses were satisfactory for purposes of accidental dosimetry. • Dose reconstruction trial proved the potential for reliable estimate of personal doses.

  19. Um pacto curricular: o pacto nacional pela alfabetização na idade certa e o desenho de uma base comum nacional

    Directory of Open Access Journals (Sweden)

    Rita de Cássia Prazeres Frangella

    2016-06-01

    Full Text Available RESUMO: Este estudo objetiva analisar o Pacto Nacional pela Alfabetização na Idade Certa (PNAIC identificando-o como movimento inicial, parte do contexto de discussão e defesa de uma Base Nacional Comum Curricular. Por meio de sua análise, torna-se possível observar o delineamento de elementos que são retomados como argumentos a favor da necessidade dessa base comum: os direitos de aprendizagem como garantia de democratização qualitativa. Busco pôr em evidência e discutir as concepções de currículo, conhecimento e aprendizagem que sustentam o PNAIC, interrogando com o que se propõe pactuar. Para tanto, defendo a compreensão do currículo como articulação/produção de significados, destacando sua dimensão discursiva, em diálogo com os estudos de Ernesto Laclau e Homi Bhabha. Analisar as forças que engendram as disputas de sentidos e as estratégias criadas para hegemonização de um dado sentido se configura como mote para esta análise.

  20. A family of oxide ion conductors based on the ferroelectric perovskite Na0.5Bi0.5TiO3.

    Science.gov (United States)

    Li, Ming; Pietrowski, Martha J; De Souza, Roger A; Zhang, Huairuo; Reaney, Ian M; Cook, Stuart N; Kilner, John A; Sinclair, Derek C

    2014-01-01

    Oxide ion conductors find important technical applications in electrochemical devices such as solid-oxide fuel cells (SOFCs), oxygen separation membranes and sensors. Na0.5Bi0.5TiO3 (NBT) is a well-known lead-free piezoelectric material; however, it is often reported to possess high leakage conductivity that is problematic for its piezo- and ferroelectric applications. Here we report this high leakage to be oxide ion conduction due to Bi-deficiency and oxygen vacancies induced during materials processing. Mg-doping on the Ti-site increases the ionic conductivity to ~0.01 S cm(-1) at 600 °C, improves the electrolyte stability in reducing atmospheres and lowers the sintering temperature. This study not only demonstrates how to adjust the nominal NBT composition for dielectric-based applications, but also, more importantly, gives NBT-based materials an unexpected role as a completely new family of oxide ion conductors with potential applications in intermediate-temperature SOFCs and opens up a new direction to design oxide ion conductors in perovskite oxides.

  1. A EDUCAÇÃO INFANTIL NA BASE NACIONAL COMUM CURRICULAR: conceitos e propostas de um currículo

    Directory of Open Access Journals (Sweden)

    Eduardo Cezari

    2016-10-01

      PALAVRAS-CHAVE: Currículo, Integração Curricular, Educação Infantil.     ABSTRACT We discuss briefly the development of the National Curriculum in Brazil for Early Childhood Education, and this is presented in the National Curriculum Common Base (BNCC. Explanaremos the principles and proposals of curriculum integration, including political processes related to the curriculum, and illustrating it as a possible way for curricular paying for this level of education. With the studies and discussions proposed by BNCC, we see the possibility of this teaching literacy levels, return to a welfare action, reducing it to take care of. It is necessary to give due attention to childhood education, understanding that this plays a socializing role, promoting the development of the identity of children, through various learning, conducted in interaction situations.   KEYWORDS: Curriculum, Curriculum Integration, Early Childhood Education.     RESUMEN Se discute brevemente el desarrollo del plan de estudios nacional en Brasil para la Educación Preescolar, y esto se presenta en el Currículo Nacional Base Común (BNCC. Explanaremos los principios y propuestas de integración curricular, incluidos los procesos políticos relacionados con el plan de estudios, y que ilustran como un posible camino para curricular pagar por este nivel de educación. Con los estudios y discusiones propuestas por BNCC, vemos la posibilidad de que esta enseñanza los niveles de alfabetización, el retorno a una acción de bienestar, reduciéndolo a cuidar. Es necesario prestar la debida atención a la educación infantil, entendiendo que esto juega un papel socializador, promoviendo el desarrollo de la identidad de los niños, a través de diversos aprendizaje, llevado a cabo en situaciones de interacción.   PALABRAS CLAVE: Curriculum, integración curricular, Educación Infantil.   Abrir em (para melhor visualização em dispositivos móveis - Formato Flipbooks: Issuu / Calameo

  2. Personalidade e protesto político na América Latina: bases psicossociais da contestação

    Directory of Open Access Journals (Sweden)

    Ednaldo Aparecido Ribeiro

    Full Text Available Resumo Investigações recentes têm identificado cenário ambíguo de redução no envolvimento dos cidadãos em modalidades tradicionais e elevações consideráveis em formas contestatórias de mobilização. As interpretações acerca das consequências desse fenômeno são diversas, algumas apontando para os perigos da desmobilização tradicional e da apatia; outras enxergando na contestação impulso para o aprofundamento democrático. Quanto às possíveis causas, podemos encontrar clara divisão em duas perspectivas dominantes: de um lado, há pesquisadores que enfatizam fatores de ordem estrutural ou macro, tais como o nível de desenvolvimento econômico nacional e o grau de abertura do sistema político; de outro, encontramos autores que apontam para a relevância de atributos individuais, como sentimentos, atitudes e valores. Nessa segunda perspectiva analítica, todavia, um aspecto relevante continua pouco explorado: a personalidade individual. Os recentes avanços nos estudos em psicologia social sobre esse tema têm revelado que os indivíduos se distinguem em termos de traços psicológicos marcantes que se refletem em comportamentos mais inovadores ou conservadores, extrovertidos ou tímidos, responsáveis ou inconsequentes, dentre outros. Apesar da plausível relação entre esses tipos de personalidades e padrões de comportamentos políticos, poucos são os estudos que até o presente momento focalizam esse condicionante do engajamento dos cidadãos em diferentes formas de ativismo político. O presente trabalho apresenta resultados de pesquisa que procurou testar no plano empírico algumas hipóteses acerca desse relacionamento, focalizando especificamente o protesto político entre o público latino-americano. A base empírica para os testes é composta pelos dados produzidos pelo Latin American Public Project (Lapop, em sua onda de 2010, para um conjunto de 17 países. Com base em modelos estatísticos multivariados, foi

  3. Redução da proteína da dieta com base no conceito de proteína ideal para tilápias-do-nilo (Oreochromis niloticus criadas em tanques-rede Dietary protein reduction based on ideal protein concept for Nile Tilapia (Oreochromis niloticus cultured in net pens

    Directory of Open Access Journals (Sweden)

    Daniele Botaro

    2007-06-01

    Full Text Available Avaliou-se o desempenho de tilápias-do-nilo (Oreochromis niloticus criadas em tanques-rede e alimentadas com dietas contendo 27,0 (controle; 25,2; 24,3 e 22,7% de proteína digestível. Aminoácidos cristalinos (L-lisina, DL-metionina e L-treonina foram adicionados à dieta considerando o conceito de proteína ideal e simulando o perfil de aminoácidos da dieta controle. Os peixes (34,63±19 g foram alimentados manualmente com dietas isoenergéticas (3.075 kcal de energia digestível/kg de dieta até saciedade aparente, três vezes ao dia, durante 91 dias. Utilizou-se um delineamento inteiramente casualizado, com quatro tratamentos, três repetições e 25 peixes/unidade experimental. Não foram observados efeitos dos níveis de proteína digestível sobre o ganho de peso, a conversão alimentar, a taxa de eficiência protéica, o peso da carcaça eviscerada, o rendimento de carcaça, o peso e o rendimento de filé, a sobrevivência e o hematócrito. Houve efeito quadrático dos níveis de proteína digestível sobre o consumo; o maior valor foi estimado para a dieta contendo 24,41% de proteína digestível e excreção de nitrogênio, na qual o melhor resultado estimado foi obtido com peixes que receberam a dieta contendo 24,92% de PD. Com a redução nos níveis de proteína digestível, observou-se aumento linear na retenção de nitrogênio. É possível reduzir o nível de proteína digestível, de 27 (29,1% de PB para 24,3% (26,6% de PB, em dietas para tilápias-do-nilo criadas em tanques-rede. Essa redução deve ser feita por meio da suplementação de aminoácidos (com base no conceito de proteína ideal, considerando o desempenho e o custo da dieta/kg ganho em filé.This study was carried out to evaluate the performance of Nile tilapia, cultured in net pens, and fed diets containing 27.0 (control, 25.2, 24.3, and 22.7% of digestible protein. Crystalline amino acids (L-lysine, DL-methionine and L-threonine were added to keep amino acid

  4. Acidentes de trabalho na zona rural de Pelotas, Rio Grande do Sul, Brasil: um estudo transversal de base populacional

    Directory of Open Access Journals (Sweden)

    Fehlberg Marta Fernanda

    2001-01-01

    Full Text Available São escassos os estudos de base populacional sobre a ocorrência de acidentes de trabalho rural. Para investigar este tema, realizou-se em Pelotas, Rio Grande do Sul, um estudo transversal com o objetivo de verificar a ocorrência e as características dos acidentes do trabalho rural. Uma amostra representativa da população foi obtida através de amostragem em estágios múltiplos, utilizando-se os setores censitários da Fundação Instituto Brasileiro de Geografia e Estatística. Em quatro meses, no ano de 1996, foram estudadas 258 famílias, e 580 trabalhadores rurais foram entrevistados, utilizando-se questionários padronizados e pré-codificados. Os acidentes de trabalho nos últimos doze meses atingiram 63 trabalhadores (11%, que referiram, pelo menos, um acidente no período. O total de acidentes ocorridos foi de 82, e foram causados, principalmente, por ferramentas manuais (29% e por animais domésticos (27%. A principal lesão provocada foi corte (50%, seguida por contusão (13% e queimadura (9%. As partes do corpo mais atingidas foram as mãos (34%, os pés (29% e as pernas (18%. Em apenas 32% dos casos, o trabalhador rural acidentado procurou tratamento. Desses, 46% procuraram o posto de saúde, e 36%, o pronto-socorro municipal.

  5. Implantação do método activity based costing na logística interna de uma empresa química Activity-based costing applied to the internal logistics of a chemical company

    Directory of Open Access Journals (Sweden)

    Themis Castro de Vasconcellos

    2008-08-01

    Full Text Available Este trabalho tem como objetivo apresentar como o método ABC - activity based costing foi implantado para realizar o custeio da logística interna da empresa química BASF SA., situada na cidade de Guaratinguetá - SP. Apresentam-se: a descrição do processo de mudança do método de custeio tradicional para o método ABC, as dificuldades encontradas e como foram ultrapassadas, bem como as vantagens constatadas pela empresa. O departamento de logística da empresa funciona como um prestador de serviços, atendendo a todos os processos produtivos das divisões (unidades de negócio existentes na planta de Guaratinguetá, no que concerne à armazenagem e ao fornecimento de matérias-primas, além de atuar na retirada e na armazenagem de produto acabado. Como principais resultados, obteve-se uma distribuição de custos mais justa entre as divisões da planta, identificação de oportunidades de melhoria nos processos logísticos, identificação de processo e atividades que não agregavam valor aos produtos, entre outros. Finalmente, o processo de implantação e os resultados foram muito bem avaliados pelos gestores, o que foi decisivo para a adoção do método ABC como sistema gerencial de custos logísticos da empresa.This paper describes an Activity-Based Costin (ABC model implemented for the costing of the internal logistics of the chemical company BASF S.A. located in Guaratinguetá, state of São Paulo, Brazil. All the phases involved in the change from the traditional costing model to the ABC model adopted by the company as presented, as are the difficulties, the solutions for detected problems, and the advantages gained. The Logistics Department of BASF acts as a service provider for all the productive processes of the company's departments (Sales Business Units - SBUs in the Guaratinguetá plant in terms of raw material storage and supply, and in the removal and storage of end products. The main results were improved costing of the

  6. Conhecimento de adultos sobre o papel da atividade física na prevenção e tratamento de diabetes e hipertensão: estudo de base populacional no Sul do Brasil

    OpenAIRE

    Knuth,Alan G.; Bielemann,Renata M.; Silva,Shana G. da; Borges,Thiago T.; Del Duca,Giovâni F.; Kremer,Marina M.; Hallal,Pedro C.; Rombaldi,Airton J.; Azevedo,Mario R.

    2009-01-01

    O objetivo deste estudo foi avaliar o conhecimento dos adultos de Pelotas, Sul do Brasil, sobre o papel da atividade física na prevenção e tratamento de diabetes e hipertensão arterial, e os fatores associados aos conhecimentos. Foi realizado um estudo transversal de base populacional, com amostragem por conglomerados, incluindo 972 indivíduos de 20 a 69 anos. O conhecimento dos efeitos da atividade física na prevenção e tratamento foi maior para a hipertensão (82%) do que para diabetes (47,2...

  7. The Electrogenic Na+/K+ Pump Is a Key Determinant of Repolarization Abnormality Susceptibility in Human Ventricular Cardiomyocytes: A Population-Based Simulation Study.

    Science.gov (United States)

    Britton, Oliver J; Bueno-Orovio, Alfonso; Virág, László; Varró, András; Rodriguez, Blanca

    2017-01-01

    Background: Cellular repolarization abnormalities occur unpredictably due to disease and drug effects, and can occur even in cardiomyocytes that exhibit normal action potentials (AP) under control conditions. Variability in ion channel densities may explain differences in this susceptibility to repolarization abnormalities. Here, we quantify the importance of key ionic mechanisms determining repolarization abnormalities following ionic block in human cardiomyocytes yielding normal APs under control conditions. Methods and Results: Sixty two AP recordings from non-diseased human heart preparations were used to construct a population of human ventricular models with normal APs and a wide range of ion channel densities. Multichannel ionic block was applied to investigate susceptibility to repolarization abnormalities. I Kr block was necessary for the development of repolarization abnormalities. Models that developed repolarization abnormalities over the widest range of blocks possessed low Na + /K + pump conductance below 50% of baseline, and I CaL conductance above 70% of baseline. Furthermore, I NaK made the second largest contribution to repolarizing current in control simulations and the largest contribution under 75% I Kr block. Reversing intracellular Na + overload caused by reduced I NaK was not sufficient to prevent abnormalities in models with low Na + /K + pump conductance, while returning Na + /K + pump conductance to normal substantially reduced abnormality occurrence, indicating I NaK is an important repolarization current. Conclusions: I NaK is an important determinant of repolarization abnormality susceptibility in human ventricular cardiomyocytes, through its contribution to repolarization current rather than homeostasis. While we found I Kr block to be necessary for repolarization abnormalities to occur, I NaK decrease, as in disease, may amplify the pro-arrhythmic risk of drug-induced I Kr block in humans.

  8. Avaliação e intervenção da disortografia baseada na semiologia dos erros: revisão da literatura Evaluation and intervention of dysortographia based on error semiology: literature review

    Directory of Open Access Journals (Sweden)

    Amparo Ygual Fernández

    2010-06-01

    Full Text Available TEMA: avaliação e intervenção na disortografia. OBJETIVO: descrever e discutir os achados encontrados na literatura sobre a disortografia segundo a sua definição, etiologia, classificação da semiologia dos erros, quadro clínico, avaliação e intervenção. CONCLUSÃO: a avaliação e a intervenção fonoaudiológica com a disortografia devem estar baseadas na classificação semiológica dos erros, pois desta forma, pode-se compreender cada tipo de erro e os fatores cognitivos ou linguísticos implicados. Isso se associa às orientações aos pais e professores de como enfocar o trabalho com a ortografia, seja em casa ou na escola sem gerar angústia e ansiedade na criança.BACKGROUND: evaluation and intervention in dysortographia. PURPOSE: to describe and discuss findings from researches concerning dysortographia according to its definition, etiology, errors semiology classification, clinical findings, evaluation, and intervention. CONCLUSION: speech language evaluation and intervention should be based on error semiology classification because in this way it is possible to understand each type of error and the linguistic and cognitive factors related to them. This is associated with the orientations to parents and teachers on how to work with orthography at home or at the classroom without causing distress and anxiety to the children.

  9. Predlog tehnološkog unapređenja telemetrijskog i teodolitskog sistema sa osvrtom na softverska rešenja / Proposal for technological improvement of telemetry and teodolite systems based on software solution

    Directory of Open Access Journals (Sweden)

    Veselin Gredić

    2005-01-01

    Full Text Available U ovom radu prikazan je sveobuhvatan pristup razvoju softverskog projekta na konkretnom primeru projekta tehnološkog unapređenja telemetrijskog i teodolitskog sistema. Istaknuta je potreba i značaj modeliranja sa posebnim osvrtom na objektnoorijentisani pristup. Kroz proces Rational Unified obezbeđena je kontrola iterativnog i inkremetacionog životnog ciklusa kroz širi skup uputstava koja se odnose na tehničke i organizacione aspekte, usmerene na analizu zahteva i dizajn. Detaljno su prezentovani zahtevi za tehnološka poboljšanja ova dva sistema, sa posebnim osvrtom na softverska rešenja. / Through this paper -we try to give a comprehensive approach of a software development process based on technological improvement of telemetry and teodolite systems. Modeling is focused on an objective-oriented approach. Control for an iterative and incremental life cycle is provided in the rational Unified Process - an extensive set of guidelines that address the technical and organizational aspects of software development, focusing on requirements analysis and design. We present in detail all requests for technological improvement of telemetry and teodolite systems with a special software solution approach.

  10. Chitosan-doped-hybrid/TiO2 nanocomposite based sol-gel coating for the corrosion resistance of aluminum metal in 3.5% NaCl medium.

    Science.gov (United States)

    J, Balaji; M G, Sethuraman

    2017-11-01

    The study outlines the role of chitosan, a biopolymer on corrosion behavior of Hy/nano-TiO 2 based sol-gel coating over aluminum metal. In this study organic-inorganic hybrid sols were synthesized through hydrolysis and condensation of 3-glycidoxypropyltrimethoxy silane (GPTMS), tetraethoxysilane (TEOS) and titanium (IV) isopropoxide (TIP) in acidic solution. Chitosan was doped into sol-gel matrix and self-assembled over aluminum substrate. The resultant chitosan-doped-Hy/nano-TiO 2 sol-gel coating was characterized by Fourier Transform Infrared (FT-IR) spectra, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Energy-Dispersive X-ray Spectroscopy (EDX) analyses. The as-tailored aluminum substrate was evaluated for corrosion resistance in neutral medium. The protection ability of these coatings was evaluated by electrochemical impedance studies (EIS) and potentiodynamic polarization (PP) measurements in 3.5% NaCl medium. The EIS and PP results showed that chitosan-doped- Hy/nano-TiO 2 sol-gel coating exhibited better protection from corrosion than the undoped Hy/TiO 2 nanocomposite coating. Copyright © 2017 Elsevier B.V. All rights reserved.

  11. Calibration of a single hexagonal NaI(Tl) detector using a new numerical method based on the efficiency transfer method

    Energy Technology Data Exchange (ETDEWEB)

    Abbas, Mahmoud I., E-mail: mabbas@physicist.net [Physics Department, Faculty of Science, Alexandria University, 21511 Alexandria (Egypt); Badawi, M.S. [Physics Department, Faculty of Science, Alexandria University, 21511 Alexandria (Egypt); Ruskov, I.N. [Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation); Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784 Sofia (Bulgaria); El-Khatib, A.M. [Physics Department, Faculty of Science, Alexandria University, 21511 Alexandria (Egypt); Grozdanov, D.N. [Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation); Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784 Sofia (Bulgaria); Thabet, A.A. [Department of Medical Equipment Technology, Faculty of Allied Medical Sciences, Pharos University in Alexandria (Egypt); Kopatch, Yu.N. [Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation); Gouda, M.M. [Physics Department, Faculty of Science, Alexandria University, 21511 Alexandria (Egypt); Skoy, V.R. [Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)

    2015-01-21

    Gamma-ray detector systems are important instruments in a broad range of science and new setup are continually developing. The most recent step in the evolution of detectors for nuclear spectroscopy is the construction of large arrays of detectors of different forms (for example, conical, pentagonal, hexagonal, etc.) and sizes, where the performance and the efficiency can be increased. In this work, a new direct numerical method (NAM), in an integral form and based on the efficiency transfer (ET) method, is used to calculate the full-energy peak efficiency of a single hexagonal NaI(Tl) detector. The algorithms and the calculations of the effective solid angle ratios for a point (isotropic irradiating) gamma-source situated coaxially at different distances from the detector front-end surface, taking into account the attenuation of the gamma-rays in the detector's material, end-cap and the other materials in-between the gamma-source and the detector, are considered as the core of this (ET) method. The calculated full-energy peak efficiency values by the (NAM) are found to be in a good agreement with the measured experimental data.

  12. Saturação por Bases no Crescimento e na Nutrição de Mudas de Ipê-Amarelo

    Directory of Open Access Journals (Sweden)

    Cristiane Vieira

    2017-04-01

    Full Text Available RESUMO O ipê-amarelo (Tabebuia serratifolia é uma espécie florestal com potencial madeireiro, porém, pouco utilizada em plantios florestais, devido à escassez de informações sobre sua produção tanto em viveiro quanto no campo. Diante disso, realizou-se experimento com o objetivo de verificar os efeitos da calagem no crescimento e na nutrição de mudas de T. serratifolia. O calcário foi misturado ao solo Latossolo Vermelho distrófico de textura franco-arenosa, em sacolas plásticas com capacidade para 2,5 kg. Os tratamentos foram dispostos em delineamento inteiramente casualizado, com cinco repetições: testemunha (26,5%; 60%; 70%; 80% e 100% de saturação por bases. Após 120 dias, avaliaram-se: altura, diâmetro de colo, relação altura e diâmetro, biomassa seca e índice de Dickson. As plantas secas foram submetidas às determinações dos teores de macronutrientes. Os melhores resultados para crescimento da T. serratifolia foram verificados no nível de 70%, principalmente porque N, K, Ca e Mg foram disponibilizados em concentrações adequadas, possibilitando o incremento.

  13. Corrosion behavior and pitting susceptibility of in-situ Ti-based metallic glass matrix composites in 3.5 wt.% NaCl solutions

    Science.gov (United States)

    Xu, K. K.; Lan, A. D.; Yang, H. J.; Han, P. D.; Qiao, J. W.

    2017-11-01

    The Ti62Zr12V13Cu4Be9, Ti58Zr16V10Cu4Be12, Ti46Zr20V12Cu5Be17, and Ti40Zr24V12Cu5Be19 metallic glass matrix composites (MGMCs) were prepared by copper mould casting. The corrosion resistance and the pitting susceptibility of Ti-based MGMCs were tested on their cross-sectional areas in 3.5 wt.% NaCl solutions by potentiodynamic polarization measurements. The composites with lower Ti contents (Ti40Zr24V12Cu5Be19 and Ti46Zr20V12Cu5Be17) exhibit a low resistance to the chloride induced pitting and local corrosion. The preferential dissolution of amorphous matrix is explained by the high chemical reactivity of beryllium element compared to that of stable dendrites and by the detected lower Ti and V contents. However, fairly good passivity was found in the composite with higher Ti contents (Ti62Zr12V13Cu4Be9). XPS measurements revealed that protective Ti-enriched oxide film was formed on the composite surface, additionally, lower content of beryllium element in amorphous matrix hinder the selective corrosion of amorphous matrix. The assessment of experimental observation leads to a proposed corrosion mechanism involving selective dissolution of amorphous matrix and chloride induced pitting process.

  14. Mixed convection flow of sodium alginate (SA-NaAlg) based molybdenum disulphide (MoS2) nanofluids: Maxwell Garnetts and Brinkman models

    Science.gov (United States)

    Ahmed, Tarek Nabil; Khan, Ilyas

    2018-03-01

    This article aims to study the mixed convection heat transfer in non-Newtonian nanofluids over an infinite vertical plate. Mixed convection is caused due to buoyancy force and sudden plate motion. Sodium alginate (SA-NaAlg) is considered as non-Newtonian base fluid and molybdenum disulphide (MoS2) as nanoparticles are suspended in it. The effective thermal conductivity and viscosity of nanofluid are calculated using the Maxwell-Garnetts (MG) and Brinkman models, respectively. The flow is modeled in the form of partial differential equations with imposed physical conditions. Exact solutions for velocity and temperature fields are developed by means of the Laplace transform technique. Numerical computations are performed for different governing parameters such as non-Newtonian parameter, Grashof number and nanoparticle volume fraction and the results are plotted in various graphs. Results for skin friction and Nusselt number are presented in tabular form which show that increasing nanoparticle volume fraction leads to heat transfer enhancement and increasing skin friction.

  15. Modelo para Apoiar a Gestão da Alocação de Pessoas com Base na Demanda de Conhecimento

    Directory of Open Access Journals (Sweden)

    Felipe Tiago Eing Engelke Back

    2012-11-01

    Full Text Available Modelo de Avaliação de Desempenho para apoiar a gestão da alocação de pessoas com base na demanda de conhecimentos, habilidades e aptidões quando do desenvolvimento de seus projetos, tendo como instrumento de intervenção o método Multicritério de Apoio à Decisão Construtivista (MCDA-C. É um estudo de caráter exploratório com abordagem quali-quantitativa. Ao final, permitiu identificar: (i três grandes dimensões de preocupação do gestor para quem o modelo foi construído; (ii 80 critérios que representam as preocupações associadas aos valores do Gestor (iii construir escalas ordinais e cardinais para cada critério com seus níveis de referência e realizar a integração através das taxas de compensação; e para o Ponto de Vista Fundamental – Gestão: (iv realizar e avaliar o diagnóstico da situação atual da alternativa analisada em 63 pontos, em uma escala cardinal; e (v apresentar o modelo com proposta de ações de aperfeiçoamento que elevaram sua avaliação para 73.DOI:10.5585/gep.v3i2.63

  16. High frequency transducer for vessel imaging based on lead-free Mn-doped (K0.44Na0.56)NbO3 single crystal

    Science.gov (United States)

    Ma, Jinpeng; Xue, Saidong; Zhao, Xiangyong; Wang, Feifei; Tang, Yanxue; Duan, Zhihua; Wang, Tao; Shi, Wangzhou; Yue, Qingwen; Zhou, Huifang; Luo, Haosu; Fang, Bijun

    2017-08-01

    We report a high frequency ultrasonic transducer up to 50 MHz for vessel imaging based on a lead-free (K0.44Na0.56)NbO3-0.5 mol. % Mn (Mn-KNN) single crystal, which has a high electromechanical coupling coefficient kt of 0.64 and a large thickness frequency constant Nt of 3210 kHz . mm. The Krimholtz, Leedom, and Mattaei (KLM) equivalent circuit model was utilized to simulate and optimize the pulse-echo response combined with PiezoCAD software. Theoretically, a high -6 dB bandwidth of 74.94% was obtained at a center frequency of 50.47 MHz and optimized matching conditions. The experimental results showed a center frequency of 51.8 MHz with a -6 dB bandwidth of 70.2%. The excellent global performance makes this lead-free single-crystal transducer quite potential in an environmentally friendly vessel imaging transducer.

  17. Seleção de genótipos parentais de acerola com base na divergência genética multivariada

    Directory of Open Access Journals (Sweden)

    CARPENTIERI-PÍPOLO VALÉRIA

    2000-01-01

    Full Text Available Este trabalho teve por objetivo identificar e selecionar genótipos parentais de acerola (Malpighia emarginata L. adequadas a programas de melhoramento genético. Nove caracteres quantitativos de maior importância agronômica foram usados para determinação da distância genética e formação de grupos similares de acessos. O agrupamento pelo método de Tocher, a partir das distâncias generalizadas de Mahalanobis, possibilitou a divisão de 14 genótipos em três grupos. Com base na divergência genética e no caráter agronômico-chave (teor de vitamina C, destacaram-se como mais promissores os cruzamentos dos genótipos: AM Mole pertencente ao grupo III, com os genótipos PR AM, N° 18, PR 17, PR 16, Eclipse, AM 22 e Dominga, todos pertencentes ao grupo I.

  18. ANÁLISE DA PAISAGEM DA BACIA HIDROGRÁFICA DO RIO ALMADA (BA COM BASE NA FRAGMENTAÇÃO DA VEGETAÇÃO

    Directory of Open Access Journals (Sweden)

    Maria Eugênia Bruck de Moraes

    2012-04-01

    Full Text Available O estudo da fragmentação da paisagem em uma bacia é de extrema importância por avaliar o status de conservação da vegetação, um recurso essencial para a manutenção da qualidade da água. O presente trabalho apresenta uma análise da fragmentação da paisagem na Bacia Hidrográfica do Rio Almada, localizada no sul da Bahia, abrangendo 9 municípios parcialmente abastecidos pela água desta bacia. Foi realizado o mapeamento dos fragmentos florestais que apresentaram área mínima de 3ha, com base na interpretação da Carta de Uso e Cobertura do Solo elaborada através da classificação supervisionada de imagens Landsat. Para a análise dos fragmentos foram adotadas 5 métricas da paisagem: tamanho, formato, efeito de borda, isolamento e conectividade. Os resultados obtidos demonstram que a BHRA ainda abriga fragmentos bastante representativos, visto que dos 58 fragmentos identificados, 8 têm área acima de 300ha, 20 entre 100 e 300ha, 21 entre 30 e 100ha e 9 entre 3 e 30ha. Com relação ao formato dos fragmentos, constatou-se que apenas 10% dos mesmos apresentam forma circular, indicando que os 90% restantes encontram-se susceptíveis ao efeito de borda, sendo que os mais alongados estão localizados no interior da bacia, provavelmente em função do avanço da pecuária extensiva nessa direção. E quanto ao isolamento dos fragmentos, a análise da conectividade com borda expandida, através de simulações, permitiu identificar que a partir da distância de 200m, 31 dos fragmentos poderiam ser conectados. Assim, pôde-se concluir que o somatório destes fragmentos, caso fossem devidamente conectados, representaria uma área de significativo valor para a conservação de espécies típicas da mata atlântica e, consequentemente, para a manutenção da qualidade da água desta bacia.

  19. Challenges in computational evaluation of redox and magnetic properties of Fe-based sulfate cathode materials of Li- and Na-ion batteries

    Science.gov (United States)

    Shishkin, Maxim; Sato, Hirofumi

    2017-06-01

    Several Fe-based sulfates have been proposed recently as cathode materials characterized by a high average operating voltage (i.e. Li2Fe(SO4)2 and Na2Fe2(SO4)3) or low fabrication temperature (e.g. Na2Fe(SO4)2·2H2O)). In this work, we apply three methods to evaluate the redox potentials and magnetic properties of these materials: (1) local density functional theory (DFT) in Perdew-Burke-Ernzerhof parametrization; (2) rotationally invariant DFT  +  U and (3) DFT  +  U with magnetic exchange, suggested herein. The U parameters used for DFT  +  U calculations have been evaluated by using a linear response method (this applies to DFT  +  U as well as DFT  +  U calculations with a magnetic exchange term). Moreover, we have performed adjustments of U and, for the case of magnetic exchange, J parameters, to find better agreement with experimental measurements of redox and magnetic properties. We find that a self-consistent DFT  +  U/linear response approach yields quite overestimated redox potentials as compared to experiment. On the other hand, we also show that DFT  +  U calculations are not capable of providing a reasonably accurate description of both redox and magnetic properties for the case of Li2Fe(SO4)2, even when adjusted U parameters are employed. As a solution, we demonstrate that a DFT  +  U methodology augmented by a magnetic exchange term potentially provides more precise values for both the redox potentials and the magnetic moments of the Fe ions in the studied materials. Thus our work shows that for a more accurate description of redox and magnetic properties, further extensions of the DFT  +  U method, such as inclusion of the contribution of magnetic exchange, should be considered.

  20. Challenges in computational evaluation of redox and magnetic properties of Fe-based sulfate cathode materials of Li- and Na-ion batteries

    International Nuclear Information System (INIS)

    Shishkin, Maxim; Sato, Hirofumi

    2017-01-01

    Several Fe-based sulfates have been proposed recently as cathode materials characterized by a high average operating voltage (i.e. Li 2 Fe(SO 4 ) 2 and Na 2 Fe 2 (SO 4 ) 3 ) or low fabrication temperature (e.g. Na 2 Fe(SO 4 ) 2 ·2H 2 O)). In this work, we apply three methods to evaluate the redox potentials and magnetic properties of these materials: (1) local density functional theory (DFT) in Perdew–Burke–Ernzerhof parametrization; (2) rotationally invariant DFT  +   U ; and (3) DFT  +   U with magnetic exchange, suggested herein. The U parameters used for DFT  +   U calculations have been evaluated by using a linear response method (this applies to DFT  +   U as well as DFT  +   U calculations with a magnetic exchange term). Moreover, we have performed adjustments of U and, for the case of magnetic exchange, J parameters, to find better agreement with experimental measurements of redox and magnetic properties. We find that a self-consistent DFT  +   U /linear response approach yields quite overestimated redox potentials as compared to experiment. On the other hand, we also show that DFT  +   U calculations are not capable of providing a reasonably accurate description of both redox and magnetic properties for the case of Li 2 Fe(SO 4 ) 2 , even when adjusted U parameters are employed. As a solution, we demonstrate that a DFT  +   U methodology augmented by a magnetic exchange term potentially provides more precise values for both the redox potentials and the magnetic moments of the Fe ions in the studied materials. Thus our work shows that for a more accurate description of redox and magnetic properties, further extensions of the DFT  +   U method, such as inclusion of the contribution of magnetic exchange, should be considered. (paper)

  1. Construtores da bio(insegurança na base de dados de perfis de ADN Constructors of bio(insecurity in the DNA profiles database

    Directory of Open Access Journals (Sweden)

    Helena Machado

    2011-02-01

    Full Text Available O presente texto analisa discursos de peritos e de políticos produzidos acerca da criação de uma base de dados de perfis de ADN em Portugal para identificação civil e investigação criminal, com o intuito de explorar alguns patamares de construção da biossegurança. Constata-se que três tipos principais de argumentação são utilizados: a ciência como suporte de uma justiça simultaneamente mais eficaz e mais credível; a necessidade de acompanhar o percurso de países mais desenvolvidos em matéria de investigação criminal e de cooperação transfronteiriça; o contributo para o bem comum. Trata-se de um projeto técnico-genético e biopolítico crescentemente global e imbricado em imaginários coletivos assentes no medo do crime e do criminoso, que assenta mais em promessas de utilidade imaginada e de eficácia na identificação de criminosos do que na invocação dos riscos e das incertezas.This paper analyses the discourses produced by experts and politicians about the creation of a DNA database for civil identification and criminal investigation purposes in Portugal, aiming to explore some stances in the construction of biosecurity. Three main types of arguments are found: science as the support of a simultaneously more effective and reliable justice; the need to follow the course of more developed countries in terms of criminal investigation and trans-border cooperation; the contribution towards the common good. This concerns an increasingly global technical-genetic and biopolitical project, merged within collective imageries built upon on fears of crime and criminals, which is more grounded on promises of imagined utility and efficacy in the identification of offenders than on the invocation of the risks and uncertainties.

  2. Dose evaluation based on {sup 24}Na activity in the human body at the JCO criticality accident in Tokai-mura

    Energy Technology Data Exchange (ETDEWEB)

    Momose, Takumaro; Tsujimura, Norio; Tasaki, Takashi; Kanai, Katsuta; Kurihara, Osamu; Hayashi, Naomi; Shinohara, Kunihiko [Japan Nuclear Cycle Development Inst., Tokai, Ibaraki (Japan). Tokai Works

    2001-09-01

    {sup 24}Na in the human body, activated by neutrons emitted at the JCO criticality accident, was observed for 62 subjects, where 148 subjects were measured by the whole body counter of JNC Tokai Works. The 148 subjects, including JCO employees and the contractors, residents neighboring the site and emergency service officers, were measured by the whole-body counter. The neutron-energy spectrum around the facility was calculated using neutron transport codes (ANISN and MCNP), and the relation between an amount of activated sodium in human body and neutron dose was evaluated from the calculated neutron energy spectrum and theoretical neutron capture probability by the human body. The maximum {sup 24}Na activity in the body was 7.7 kBq (83 Bq({sup 24}Na)/g({sup 23}Na)) and the relevant effective dose equivalent was 47 mSv. (author)

  3. Assessment of Impact of the Rheological Parameters Change on Sensitivity of the Asphalt Strain Based on the Test Results / Ocena Wpływu Zmiany Parametrów Reologicznych Na Wrażliwość Deformacji Mieszanek Mineralno - Asfaltowych Na Podstawie Wyników Badań

    Science.gov (United States)

    Kurpiel, Artur; Wysokowski, Adam

    2015-03-01

    The creep test under the static loading, that allows to determine rheological properties of asphalt based on the creep curve, is the most effective test nowadays. Applied loads are non-destructive and allow to observe the course of the strain after the test load. The test can be carried out on compressing, shearing, bending as well as on triaxial test, that depends on the applied apparatus implementing different intensity [1, 2, 3, 4, 5, 6]. Based on the creep test, the stress of different properties can be specified. Among them there are valuable rheological properties based on selected viscoelascity models [1]. The properties of the viscoelascity models are relevant indexes depicting resistance to deformation. They can be used to forecast the wheel-truck in the accepted rheological model [1]. In this article it is shown the impact of different rheological properties of the viscoelacity model on the wheel-truck as well as the impact of different properties on shape and the course of the creep curve. The asphalt mixtures presented in this article are characterized by variable rheological properties. It is therefore difficult to determine which property mostly affects the size of the strain. However, the authors of this article attempted to analyse the change of the asphalt strain value of the different variables in particular rheological model, called Bürgers's model. Badanie pełzania pod obciążeniem statycznym jest obecnie najbardziej efektywnym badaniem pozwalającym na określenie reologicznych parametrów mieszanek mineralno - asfaltowych na podstawie krzywej pełzania. Stosowane obciążenia mają poziom nieniszczący i pozwalają na obserwację przebiegu odkształceń w czasie również po odciążeniu. Badanie może być realizowane przy ściskaniu, ścinaniu, rozciąganiu i zginaniu, a także w zakresie trójosiowym, w zależności od stosowanego aparatu realizującego zadany schemat naprężeń [1, 2, 3, 4, 5, 6]. Na podstawie badania pełzania można

  4. Fabrication and evaluation of chitosan/NaYF4:Yb3+/Tm3+ upconversion nanoparticles composite beads based on the gelling of Pickering emulsion droplets

    International Nuclear Information System (INIS)

    Yan, Huiqiong; Chen, Xiuqiong; Shi, Jia; Shi, Zaifeng; Sun, Wei; Lin, Qiang; Wang, Xianghui; Dai, Zihao

    2017-01-01

    The rare earth ion doped upconversion nanoparticles (UCNPs) synthesized by hydrophobic organic ligands possess poor solubility and low fluorescence quantum yield in aqueous media. To conquer this issue, NaYF 4 :Yb 3+ /Tm 3+ UCNPs, synthesized by a hydrothermal method, were coated with F127 and then assembled with chitosan to fabricate the chitosan/NaYF 4 :Yb 3+ /Tm 3+ composite beads (CS/NaYF 4 :Yb 3+ /Tm 3+ CBs) by Pickering emulsion system. The characterization results revealed that the as-synthesized NaYF 4 :Yb 3+ /Tm 3+ UCNPs with an average size of 20 nm exhibited spherical morphology, high crystallinity and characteristic emission upconversion fluorescence with an overall blue color output. The NaYF 4 :Yb 3+ /Tm 3+ UCNPs were successfully conjugated on the surface of chitosan beads by the gelling of emulsion droplets. The resultant CS/NaYF 4 :Yb 3+ /Tm 3+ CBs showed good upconversion luminescent property, drug-loading capacity, release performance and excellent biocompatibility, exhibiting great potentials in targeted drug delivery and tissue engineering with potential tracking capability and lasting release performance. - Highlights: • NaYF 4 :Yb 3+ /Tm 3+ UCNPs were coated by F127 to improve aqueous dispersibility. • NaYF 4 :Yb 3+ /Tm 3+ UCNPs were assembled with chitosan to fabricate the composite beads (CMs). • Pickering emulsions stabilized by UCNPs exhibited uniform and satisfactory emulsion droplets. • The CMs prepared by the gelling of emulsion droplet preserved upconversion luminescent property. • The resultant CMs showed good drug-loading capacity, release performance and biocompatibility.

  5. Tsé na'alkaah: Weaving Native and Mainstream Earth and Environmental Science into Place-Based Teacher Professional Development on the Colorado Plateau

    Science.gov (United States)

    Semken, S. C.; Godsey, H. S.; Tsosie, W. B., Jr.

    2017-12-01

    Place-based, culturally-integrated approaches to teaching geoscience and environmental science are aligned with traditional indigenous education, and illustrate the premise that leveraging the cultural capital of Native Americans and other underrepresented groups renders more inclusive and relevant teaching. Situating learning within local landscapes, environments, and communities; and meaningfully connecting mainstream science with Native science and knowledge of place enables students to construct new knowledge that is scaffolded by their own worldview and experiences, and helps lessen any sense of discontinuity that may arise from apparently disparate interpretations of Earth processes. We drew on this philosophy in implementing a multi-year program of summer professional-development workshops for K-12 teachers in the Colorado Plateau and Intermountain regions, many of whom work in schools that serve majority Native American student populations. Through collaboration of geoscientists, Diné (Navajo) cultural experts, and master teachers, we developed and implemented inquiry-rich field excursions in which learning about Earth-system features and processes on the Plateau utilized factual and conceptual knowledge from mainstream geoscience and Diné geoscience (tsé na'alkaah) alike, as well as on other forms of local place knowledge such as Diné toponymy and history. Participants used concepts such as the dynamic interactions of Earth (Nahasdzaan) and Sky (Yádilhil) systems and the natural order (nitsahakees, nahat'a, iina, siihasin) to interpret natural landscape features (e.g., desert landforms, Plateau stratigraphy, Laramide structures) as well as anthropogenic impacts (e.g., uranium extraction and its environmental and health effects) in the field. We will share specific examples of place-based, culturally integrated curriculum and assessment from this program.

  6. Mechanical bending strength of (Bi0.5Na0.5 TiO3-based lead-Free piezoelectric ceramics

    Directory of Open Access Journals (Sweden)

    Hiroaki Takahashi

    2017-09-01

    Full Text Available (Bi0.5Na0.5TiO3 [BNT] is expected as one of candidate lead-free materials because these ceramics show relatively good high-power piezoelectric properties. In this study, we tried to understand the bending strength and fracture behavior of the BNT-based ceramics. To measure the bending strength, a three-point bending test on the basis of JIS was conducted using 12.0 × 4.0 × 1.0 mm3 specimens. An average bending strength, σA, of pure BNT ceramics sintered at 1100 °C for 2, 12 and 24 h were 217, 195 and 187 MPa, respectively. It is cleared that the σA increased with decreasing the sintering time, (grain size and pore size. We also investigated the bending strength of Nb2O5 doped BNT ceramics [BNT-Nb x, x = 0.05 ∼ 1.5 wt%] and MnCO3 doped BNT ceramics [BNT-Mn x, x = 0.5 and 1.0 wt%]. Values of the σA of BNT-Nb 0.5 and BNT-Mn 0.5 were 222, and 188 MPa, respectively. It is clarified that soft dopants (Nb can improve the bending strength of BNT-based ceramics. Additionally, hot-pressed BNT [HP-BNT] were sintered at 1050 °C for 5 h, and the σA of HP-BNT was 245 MPa.

  7. Fabrication and evaluation of chitosan/NaYF4:Yb3+/Tm3+ upconversion nanoparticles composite beads based on the gelling of Pickering emulsion droplets.

    Science.gov (United States)

    Yan, Huiqiong; Chen, Xiuqiong; Shi, Jia; Shi, Zaifeng; Sun, Wei; Lin, Qiang; Wang, Xianghui; Dai, Zihao

    2017-02-01

    The rare earth ion doped upconversion nanoparticles (UCNPs) synthesized by hydrophobic organic ligands possess poor solubility and low fluorescence quantum yield in aqueous media. To conquer this issue, NaYF 4 :Yb 3+ /Tm 3+ UCNPs, synthesized by a hydrothermal method, were coated with F127 and then assembled with chitosan to fabricate the chitosan/NaYF 4 :Yb 3+ /Tm 3+ composite beads (CS/NaYF 4 :Yb 3+ /Tm 3+ CBs) by Pickering emulsion system. The characterization results revealed that the as-synthesized NaYF 4 :Yb 3+ /Tm 3+ UCNPs with an average size of 20nm exhibited spherical morphology, high crystallinity and characteristic emission upconversion fluorescence with an overall blue color output. The NaYF 4 :Yb 3+ /Tm 3+ UCNPs were successfully conjugated on the surface of chitosan beads by the gelling of emulsion droplets. The resultant CS/NaYF 4 :Yb 3+ /Tm 3+ CBs showed good upconversion luminescent property, drug-loading capacity, release performance and excellent biocompatibility, exhibiting great potentials in targeted drug delivery and tissue engineering with potential tracking capability and lasting release performance. Copyright © 2016 Elsevier B.V. All rights reserved.

  8. Danish physicians' preferences for prescribing escitalopram over citalopram and sertraline to treatment-naïve patients: a national, register-based study.

    Science.gov (United States)

    Poulsen, Karen Killerup; Glintborg, Dorte; Moreno, Søren Ilsøe; Thirstrup, Steffen; Aagaard, Lise; Andersen, Stig Ejdrup

    2013-05-01

    To investigate whether general practitioners, hospital physicians and specialized practitioners in psychiatry have similar preferences for initiating treatment with expensive serotonin-specific reuptake inhibitors (SSRIs). All first-time prescriptions for the SSRIs escitalopram, citalopram and sertraline reported to the Danish National Register of Medicinal Product Statistics from April 1, 2009 until March 31, 2010 were analysed with regard to treatment naivety and type of prescriber. A prescription was considered as first time if the patient had not received a prescription for the same drug within the last 2 years. Patients who had not received a prescription for an antidepressant within 6 months prior to the date of redemption were classified as treatment-naïve. We included 82,702 first-time prescriptions, 65,313 (79 %) of which were for treatment-naïve patients. Of the treatment-naïve patients, 19 % were initially prescribed escitalopram. Hospital physicians prescribed escitalopram to 34 % of their treatment-naïve patients, while practitioners specialized in psychiatry prescribed it to 25 %, and general practitioners prescribed it to 17 %. General practitioners, however, were responsible for initiating 87 % of all treatment-naïve patients. The most expensive SSRI, escitalopram, is prescribed as first choice to one in five patients receiving their first antidepressant of escitalopram, citalopram or sertraline. General practitioners made the bulk of all first-time SSRI prescriptions to treatment-naïve patients.

  9. Produção científica sobre psicoterapias na base de dados PePsic (1998/2007

    Directory of Open Access Journals (Sweden)

    Fabiana Pessini Pinto

    2010-08-01

    Full Text Available Esta pesquisa objetiva analisar a produção científica publicada no período entre 1998 e 2007 sobre psicoterapia, considerando: distribuição das publicações ano a ano; periódicos; quantidade e sexo dos autores; tipos de pesquisa; enfoque teórico das produções; afiliação institucional dos autores e estratégias de avaliação psicológica utilizadas, material constituído de artigos publicados em periódicos científicos indexados à base de dados PePsic (N=117, obtido com o verbete "psicoterapia". A análise apresentada é quantitativa. Os autores das produções são do sexo feminino em sua maioria. Dos tipos de trabalhos analisados, houve predomínio de teóricos, seguidos por empíricos. Cinco dos periódicos possuem 50,5% da produção pesquisada. O enfoque teórico psicanalítico teve maior predominância, seguido do cognitivo e comportamental. A maior parte dos autores está afiliada a instituições brasileiras, as quais estão concentradas na região sudeste do país. Houve uma maior prevalência para o uso de entrevistas e escalas como estratégias de avaliação psicológica.

  10. Hepatitis C viral evolution in genotype 1 treatment-naïve and treatment-experienced patients receiving telaprevir-based therapy in clinical trials.

    Directory of Open Access Journals (Sweden)

    Tara L Kieffer

    Full Text Available In patients with genotype 1 chronic hepatitis C infection, telaprevir (TVR in combination with peginterferon and ribavirin (PR significantly increased sustained virologic response (SVR rates compared with PR alone. However, genotypic changes could be observed in TVR-treated patients who did not achieve an SVR.Population sequence analysis of the NS3•4A region was performed in patients who did not achieve SVR with TVR-based treatment.Resistant variants were observed after treatment with a telaprevir-based regimen in 12% of treatment-naïve patients (ADVANCE; T12PR arm, 6% of prior relapsers, 24% of prior partial responders, and 51% of prior null responder patients (REALIZE, T12PR48 arms. NS3 protease variants V36M, R155K, and V36M+R155K emerged frequently in patients with genotype 1a and V36A, T54A, and A156S/T in patients with genotype 1b. Lower-level resistance to telaprevir was conferred by V36A/M, T54A/S, R155K/T, and A156S variants; and higher-level resistance to telaprevir was conferred by A156T and V36M+R155K variants. Virologic failure during telaprevir treatment was more common in patients with genotype 1a and in prior PR nonresponder patients and was associated with higher-level telaprevir-resistant variants. Relapse was usually associated with wild-type or lower-level resistant variants. After treatment, viral populations were wild-type with a median time of 10 months for genotype 1a and 3 weeks for genotype 1b patients.A consistent, subtype-dependent resistance profile was observed in patients who did not achieve an SVR with telaprevir-based treatment. The primary role of TVR is to inhibit wild-type virus and variants with lower-levels of resistance to telaprevir. The complementary role of PR is to clear any remaining telaprevir-resistant variants, especially higher-level telaprevir-resistant variants. Resistant variants are detectable in most patients who fail to achieve SVR, but their levels decline over time after treatment.

  11. Parametri za procena na kvalitetot na polietilenska i na polipropilenska ambalaza i na gumeni zatvoraci nameneti za farmacevtski preparati

    Directory of Open Access Journals (Sweden)

    Liljana Ugrinova

    2002-03-01

    Full Text Available Napraven e pregled na parametrite za procena na kvalitetot na polietilenska i na polipropilenska ambalaza i na gumeni zatvoraci nameneti za farmacevtski preparati. Za procena na kvalitetot na ispituvaniot materijal bea izvrseni fizicki, hemiski i bioloski ispituvanja spored postapkite dadeni vo Ph. Eur., DIN i spored DIN ISO standardite. Baranjata za kvalitet na ovoj vid ambalaza propisani spored Ph. Eur., DIN i DIN ISO standardite se razlikuvaat vo odnos na predvidenite parametri za fizicki, za hemiski i za bioloski ispituvanja. Isto taka, propisani se i razlicni granici na dozvoleno otstapuvanje na oddelni parametri.

  12. Studies on solid solutions based on layered honeycomb-ordered phases P2-Na{sub 2}M{sub 2}TeO{sub 6} (M=Co, Ni, Zn)

    Energy Technology Data Exchange (ETDEWEB)

    Berthelot, Romain; Schmidt, Whitney; Sleight, A.W. [Department of Chemistry, Oregon State University, Corvallis, OR 97331 (United States); Subramanian, M.A., E-mail: mas.subramanian@oregonstate.edu [Department of Chemistry, Oregon State University, Corvallis, OR 97331 (United States)

    2012-12-15

    Three complete solid solutions between the layered phases P2-Na{sub 2}M{sub 2}TeO{sub 6} (M=Co, Ni, Zn) have been prepared by conventional solid state method and investigated through X-ray diffraction, magnetism and optical measurements. All compositions are characterized by a M{sup 2+}/X{sup 6+} honeycomb ordering within the slabs and crystallize in a hexagonal unit cell. However, a structural transition based on a different stacking is observed as nickel (space group P6{sub 3}/mcm) is substituted by zinc or cobalt (space group P6{sub 3}22). All compositions exhibit a paramagnetic Curie-Weiss behavior at high temperatures; and the magnetic moment values confirm the presence of Ni{sup 2+} and/or Co{sup 2+} cations. The low-temperature antiferromagnetic order of Na{sub 2}Ni{sub 2}TeO{sub 6} and Na{sub 2}Co{sub 2}TeO{sub 6} is suppressed by zinc substitution. The color of the obtained compositions varies from pink, to light green and white when M=Co, Ni, Zn, respectively. - Graphical abstract: The comparison between the structure of Na{sub 2}Ni{sub 2}TeO{sub 6} (left) and Na{sub 2}M{sub 2}TeO{sub 6} (M=Co, Zn) (right) evidences the stacking difference with distinct atom sequences along the hexagonal c-axis. Highlights: Black-Right-Pointing-Pointer Solid solutions between lamellar phases Na{sub 2}M{sub 2}TeO{sub 6} (M=Co, Ni, Zn) are investigated. Black-Right-Pointing-Pointer A M{sup 2+}/X{sup 6+} honeycomb ordering characterized all the compositions. Black-Right-Pointing-Pointer A structural transition is shown when Ni is replaced by Co or Zn. Black-Right-Pointing-Pointer The low-temperature AFM ordering of Na{sub 2}Ni{sub 2}TeO{sub 6} and Na{sub 2}Co{sub 2}TeO{sub 6} is suppressed by zinc substitution. Black-Right-Pointing-Pointer Color changes from pink to light green and white when M=Co, Ni, Zn, respectively.

  13. Estudo do comportamento da resina base na formulação de compósitos de politetrafluoretileno com bronze

    OpenAIRE

    Ronaldo Euzébio Bento

    2011-01-01

    Resumo: Esse trabalho concentra os estudos na investigação das propriedades de resistência a tração e alongamento do compósito de Politetrafluoretileno (PTFE) com 60% de bronze após a substituição do tipo de PTFE utilizado na formulação desse compósito. Atualmente esse compósito utiliza PTFE convencional na formulação e o objetivo é alterar para PTFE modificado. A motivação para essa alteração deveu-se ao fato que o PTFE convencional apresenta disponibilidade limitada dificultando o desenvolv...

  14. Potassium estimation in the soil solution based on electrical conductivity and soil water content Estimativa de potássio na solução do solo baseada na condutividade elétrica e umidade do solo

    Directory of Open Access Journals (Sweden)

    Torquato M. de Andrade Neto

    2012-06-01

    Full Text Available The objective of this work was to evaluate and to validate models for estimating potassium in the soil solution as a function of bulk electrical conductivity (ECw, soil water content (q and a soil solution electrical conductivity (ECss. Treatments consisted of using three concentrations of injecting solution of potassium chloride (1.0, 2.5 and 4.0 g L-1 which were applied by two trickle irrigation systems (microsprinkler and drip during the first cycle of the banana crop cv. Terra Maranhão. Results showed that it is feasible to estimate potassium concentration in the soil solution from data of ECss and q obtained by time domain reflectometry (TDR using an equation that combined a linear and a potential model. The estimated values of potassium concentration were close to the ones measured along the crop cycle under field conditions, with a mean normalized deviation of 10.0%, maximum and minimum deviation of 5.0 and 13.0%, respectively.O objetivo deste trabalho foi avaliar e validar modelo de estimativa de potássio na solução do solo, como função da condutividade elétrica aparente (CEa, da umidade do solo (q e da condutividade elétrica da solução do solo (CEss. Os tratamentos consistiram no uso de três concentrações de cloreto de potássio da solução de injeção (1,0, 2,5 e 4,0 g L-1 aplicadas por microaspersão e por gotejamento, durante o primeiro ciclo da cultura da bananeira cultivar Terra Maranhão. Os resultados mostraram que é viável estimar a concentração de K+ na solução do solo a partir de dados de q e CEa, obtidos por meio da técnica da reflectometria no domínio do tempo (TDR para condições de campo, com uso de equação resultante da combinação de um modelo linear e um potencial. Os valores de K+ estimados se aproximaram dos medidos ao longo do ciclo da cultura da bananeira "Terra" nas condições de campo, com desvio normalizado médio de 10%, desvio máximo e mínimo de 5,0 e 13,0%, respectivamente.

  15. O ensino da língua Brasileira de sinais na educação infantil para crianças ouvintes e surdas: considerações com base na psicologia histórico-cultural

    Directory of Open Access Journals (Sweden)

    Hivi de Castro Ruiz Marques

    2013-12-01

    Full Text Available Este artigo objetiva expor considerações teóricas a respeito do ensino da Língua Brasileira de Sinais (Libras na educação infantil como recurso na mediação entre crianças ouvintes e surdas, considerando a importância do mesmo para a inclusão, e discutir seu impacto sobre o desenvolvimento humano, sob a perspectiva da Psicologia Histórico-Cultural (PHC. O conteúdo resulta de investigação bibliográfico-conceitual desenvolvida no período de 2011-2012. Entendemos que o ensino de Libras pode favorecer a aprendizagem e o desenvolvimento de crianças surdas e ouvintes, permitindo, sobretudo, àquelas multiplicar o número de interlocutores. A Libras oportuniza trocas linguísticas efetivas entre os pares surdos e ouvintes, e às crianças ouvintes oferta o acesso a um universo cultural desconhecido. Estudos de fontes primárias (publicações soviéticas e secundárias (publicações mais recentes sobre a defectologia vygotskiana, o ensino da Libras e a linguagem apontam a possibilidade de desenvolvimento de crianças ouvintes e surdas no que concerne à linguagem, sendo importante o ensino da Libras como segunda língua, enquanto recurso para crianças ouvintes. Podemos concluir quanto é necessário incrementar o ensino da Libras, e para isso a legislação regulamentada deve ser de fato cumprida. A Libras, ao estar presente nos espaços da educação escolar, não é privilégio, mas constitui-se em conteúdo fundante ao surdo e elemento agregador para o ouvinte em seu processo de formação genérica, de homem cultural.

  16. Posicionamento estratégico de MPE'S com base na inovação através do modelo Hélice Tríplice

    Directory of Open Access Journals (Sweden)

    Dusan Schreiber

    Full Text Available A globalização dos mercados, os avanços da ciência e da tecnologia, estimulou o surgimento de novos nichos de mercado, com consumidores mais exigentes, e, também, o aumento da competitividade entre empresas (ORTIZ, 2003. Nesse panorama, destacam-se as micro e pequenas empresas - MPE's, que se responsabilizam por parcela relevante de geração de oportunidades de emprego e de renda no país. No entanto,estudos apontam para a fragilidade técnica e produtiva das MPE'sque se reflete em índices mais elevados de encerramento de operações e de inadimplência de obrigações sociais e tributárias (SEBRAE, 2009. Esses agentes econômicos, por vezes menos preparados para competir, mas essenciais para o sistema econômico e social dos países, foram contemplados com políticas públicas, voltadas para o estímulo ao empreendedorismo, priorizando a capacitação em gestão e métodos de produção (CASSIOLATO & LASTRES, 2001. Dentre elas destacam-se a constituição de redes colaborativas de MPE's, a capacitação de seus gestores e equipes operacionais, além da disponibilização de acesso ao conhecimento técnico, com vistas a subsidiar a atividade de inovação de produtos e processos (MATTOS et al., 2009. Com o objetivo de otimizar a alocação de recursos públicos para o referido fim, os agentes governamentais optam pela adoção do modelo de Hélice Tríplice, por meio do qual o governo media a interação entre a academia e as empresas e fomenta o compartilhamento da infra-estrutura universitária, dos conhecimentos, métodos e técnicas, desde a gestão até a operação. O objetivo deste trabalho visa evidenciar as características do posicionamento estratégico de empresas de pequeno porte, que participam de duas redes de cooperação, atuantes na região sul do país, com destaque para o processo de concepção de estratégias individuais e coletivas construídas com base em programas de capacitação em inovação, de produtos e

  17. Experimental And Modelling Investigations on Na-Illite: Acid-Base Behaviour And the Sorption Of Strontium, Nickel, Europium And Uranyl

    International Nuclear Information System (INIS)

    Bradbury, M.H.; Baeyens, B.

    2005-06-01

    In an extensive study the physico-chemical, protolysis and sorption characteristics of Sr(II), Ni(II), Eu(III) and U(VI) have been measured on illite and modeled over a wide range of pH, sorbate and NaCI0 4 concentrations. SampIes of Illite du Puy, collected in the region of Le Puy-en- Velay, France, were carefully conditioned to the Na-form and physico-chemically characterised. Potentiometric titrations on suspensions of the Na-illite were carried out using a batch back titration technique in 0.01, 0.1 and 0.5 M NaCI0 4 background electrolytes from pH 2 to 12 in an inert atmosphere glove box. The supernatant solutions from each titration experiment in each series were analysed for K, Mg, Ca, Sr, Si, Al, Fe and Mn. The titration data were modeled in terms of the protolysis of two amphoteric edge sites (=S W1 0H and =S W2 0H) without an electrostatic term. The protonation/deprotonation constants and site capacities obtained from the titration measurements were then fixed. The sorption edge and isotherm data were modeled with strong (=S S OH) and weak (=S W1 0H) surface complexation sites, assumed to have the same protolysis constants, again without electrostatic terms. Uptake by cation exchange was included in all of the calculations. This sorption model, the 2 site protolysis non electrostatic surface complexation and cation exchange model, had been developed previously for montmorillonite and was successful in describing the sorption characteristics of Sr, Ni, Eu and U on Na-illite over a wide range of conditions. Cation exchange capacity, strong and weak site capacities and protolysis constants for Na-illite are given, together with surface complexation constants and selectivity coefficients for Sr, Ni, Eu and U. At 0.01 M NaCI0 4 and pH below 8 the sorption of Sr, Ni, Eu and U was dominated by a cation exchange mechanism. The strong dependency of sorption on pH observed under these conditions arose from the competitive effects of Ca and Al on the uptake of the

  18. Experimental And Modelling Investigations on Na-Illite: Acid-Base Behaviour And the Sorption Of Strontium, Nickel, Europium And Uranyl

    Energy Technology Data Exchange (ETDEWEB)

    Bradbury, M.H.; Baeyens, B

    2005-06-01

    In an extensive study the physico-chemical, protolysis and sorption characteristics of Sr(II), Ni(II), Eu(III) and U(VI) have been measured on illite and modeled over a wide range of pH, sorbate and NaCI0{sub 4} concentrations. SampIes of Illite du Puy, collected in the region of Le Puy-en- Velay, France, were carefully conditioned to the Na-form and physico-chemically characterised. Potentiometric titrations on suspensions of the Na-illite were carried out using a batch back titration technique in 0.01, 0.1 and 0.5 M NaCI0{sub 4} background electrolytes from pH 2 to 12 in an inert atmosphere glove box. The supernatant solutions from each titration experiment in each series were analysed for K, Mg, Ca, Sr, Si, Al, Fe and Mn. The titration data were modeled in terms of the protolysis of two amphoteric edge sites (=S{sup W1}0H and =S{sup W2}0H) without an electrostatic term. The protonation/deprotonation constants and site capacities obtained from the titration measurements were then fixed. The sorption edge and isotherm data were modeled with strong (=S{sup S}OH) and weak (=S{sup W1}0H) surface complexation sites, assumed to have the same protolysis constants, again without electrostatic terms. Uptake by cation exchange was included in all of the calculations. This sorption model, the 2 site protolysis non electrostatic surface complexation and cation exchange model, had been developed previously for montmorillonite and was successful in describing the sorption characteristics of Sr, Ni, Eu and U on Na-illite over a wide range of conditions. Cation exchange capacity, strong and weak site capacities and protolysis constants for Na-illite are given, together with surface complexation constants and selectivity coefficients for Sr, Ni, Eu and U. At 0.01 M NaCI0{sub 4} and pH below 8 the sorption of Sr, Ni, Eu and U was dominated by a cation exchange mechanism. The strong dependency of sorption on pH observed under these conditions arose from the competitive effects of

  19. Ingestion of Sodium Bicarbonate (NaHCO3) Following a Fatiguing Bout of Exercise Accelerates Postexercise Acid-Base Balance Recovery and Improves Subsequent High-Intensity Cycling Time to Exhaustion.

    Science.gov (United States)

    Gough, Lewis A; Rimmer, Steven; Osler, Callum J; Higgins, Matthew F

    2017-10-01

    This study evaluated the ingestion of sodium bicarbonate (NaHCO 3 ) on postexercise acid-base balance recovery kinetics and subsequent high-intensity cycling time to exhaustion. In a counterbalanced, crossover design, nine healthy and active males (age: 23 ± 2 years, height: 179 ± 5 cm, body mass: 74 ± 9 kg, peak mean minute power (W peak ) 256 ± 45 W, peak oxygen uptake (V̇O 2peak ) 46 ± 8 ml.kg -1 .min -1 ) performed a graded incremental exercise test, two familiarization and two experimental trials. Experimental trials consisted of cycling to volitional exhaustion (T LIM1 ) at 100% W PEAK on two occasions (T LIM1 and T LIM2 ) interspersed by a 90 min passive recovery period. Using a double-blind approach, 30 min into a 90 min recovery period participants ingested either 0.3 g.kg -1 body mass sodium bicarbonate (NaHCO 3 ) or a placebo (PLA) containing 0.1 g.kg -1 body mass sodium chloride (NaCl) mixed with 4 ml.kg -1 tap water and 1 ml.kg -1 orange squash. The mean differences between T LIM2 and T LIM1 was larger for PLA compared with NaHCO 3 (-53 ± 53 vs. -20 ± 48 s; p = .008, d = 0.7, CI =-0.3, 1.6), indicating superior subsequent exercise time to exhaustion following NaHCO 3 . Blood lactate [Bla - ] was similar between treatments post T LIM1 , but greater for NaHCO 3 post T LIM2 and 5 min post T LIM2 . Ingestion of NaHCO 3 induced marked increases (p < .01) in both blood pH (+0.07 ± 0.02, d = 2.6, CI = 1.2, 3.7) and bicarbonate ion concentration [HCO 3 - ] (+6.8 ± 1.6 mmo.l -1 , d = 3.4, CI = 1.8, 4.7) compared with the PLA treatment, before T LIM2 . It is likely both the acceleration of recovery, and the marked increases of acid-base after T LIM1 contributed to greater T LIM2 performance compared with the PLA condition.

  20. Avaliação do uso de pomada à base de sementes de jaqueira (Artocarpus heterophyllus Lam na terapêutica tópica de feridas

    Directory of Open Access Journals (Sweden)

    R. N.L. Vitorino Filho

    2009-07-01

    Full Text Available As propriedades cicatrizantes da jaqueira (Artocarpus heterophyllus Lam são atribuídas a uma proteína encontrada na semente de sua fruta que, em casos de queimaduras de pele, proporciona a regeneração do tecido danificado em vez da substituição por tecido conjuntivo fibroso. Objetivando avaliar macro e microscopicamente o efeito da pomada formulada com o pó obtido a partir de sementes de jaca na cicatrização, por segunda intenção, de feridas cutâneas em camundongos, limpas e infectadas experimentalmente por Staphylococcus aureus, realizou-se o estudo em 96 camundongos nos quais foram feitas feridas experimentais na região dorso-lateral. Cada grupo, com 12 animais, recebeu um tipo de tratamento. O grupo GI serviu como controle para feridas limpas, o grupo GII foi o controle para feridas infectadas e os demais foram tratados topicamente com pomada à base de semente de jaca em diferentes esquemas de administração. Os animais foram avaliados diariamente e sacrificados cinco, 10 e 13 dias após a cirurgia, sendo removido o tecido cicatricial e circunjacente para avaliação histológica. Os resultados mostraram que não houve diferença estatisticamente significativa entre os tratamentos. Palavras-chave: camundongos; cicatrização; feridas; jaca; Artocarpus heterophyllus Lam; lectina.

  1. Influence of aluminium source on the crystal structure and framework coordination of Al and Si in fly ash-based zeolite NaA

    CSIR Research Space (South Africa)

    Ameh, AE

    2017-01-01

    Full Text Available In this study zeolite NaA with different crystal sizes and % crystallinity was prepared from a clear solution extract of fused fly ash. Sodium aluminate or aluminium hydroxide was used to adjust the aluminium content in the fused fly ash extract...

  2. Effect of the raw material type and the reaction time on the synthesis of halloysite based Zeolite Na-P1

    Directory of Open Access Journals (Sweden)

    Mahdi Meftah

    Full Text Available Zeolites are currently one of the most important classes of inorganic materials because of their multiple applications not only as ions exchangers and molecular sieves, but also as catalysts. This works focus the synthesis and the characterization of Zeolite Na-P1 using halloysite (collected near Ain Khemouda, western Tunisia as the starting material. Two parameters, such as the host materials type (natural or treated and the reaction time, involved in the synthesis process are investigated. The intermediate phases and final products were characterized by X-ray diffraction, Infrared IR spectroscopy, scanning electron microscopy and high-resolution 29Si and 27Al MAS NMR. Obtained results show that the hydrothermal synthesis from natural and heated-halloysite leads to formation of homogenous Zeolite Na-P1. The difference in the crystallization/transformation time process is explained by the effect of the dissolution rate of the starting materials in sodium hydroxide solution. In the case of heated halloysite, the synthesis reaction with alkali solution occurs very readily and achieved without prior thermal activation at high temperature. The optimal conditions of Zeolite Na-P1 crystallization, from heated-halloysite, are reached at 120 °C. Keywords: Zeolite Na-P1, Halloysite, X-ray, FTIR spectroscopy, SEM, 29Si and 27Al MAS NMR spectroscopy

  3. Lead-free (K0.5Na0.5)NbO3 thin films by pulsed laser deposition driving MEMS-based piezoelectric cantilevers

    NARCIS (Netherlands)

    Nguyen, Duc Minh; Dekkers, Jan M.; Houwman, Evert Pieter; Vu, H.T.; Vu, Hung N.; Rijnders, Augustinus J.H.M.

    2016-01-01

    Thin film capacitors of the lead-free (K0.5Na0.5)NbO3 (KNN) with (100) orientation were grown on Pt/Ti/SiO2/SOI (silicon-on-insulator) substrates by pulsed laser deposition. The films are pure phases and do not show other crystal orientations. The remnant polarization Pr, saturation polarization

  4. Estiolamento, incisão na base da estaca e uso do ácido indolbutírico na propagação da caramboleira por estacas lenhosas Effect of indolebutyric acid, etiolation and basal injury on propagation of star fruit by hardwood cuttings

    Directory of Open Access Journals (Sweden)

    Débora Costa Bastos

    2009-02-01

    Full Text Available Objetivou-se, neste trabalho, avaliar o efeito do estiolamento, da incisão na base da estaca e do tratamento com ácido indolbutírico (AIB no enraizamento de estacas lenhosas de caramboleira. As estacas foram padronizadas com um par de folhas inteiras e 12 cm de comprimento. O experimento foi conduzido em delineamento estatístico inteiramente casualizado, em arranjo fatorial 3 x 4, onde os fatores estudados foram técnicas aplicadas nas estacas (estiolamento, ferimento na base e controle e diferentes concentrações de AIB (0; 3.000; 6.000 e 9.000 mg L-1. As estacas lenhosas foram utilizadas como tratamento-controle. O estiolamento foi realizado 45 dias antes da retirada da estaca no ramo, envolvendo-se a base da futura estaca com fita plástica preta. A incisão na base da estaca foi realizada no preparo das mesmas, através de dois cortes na base. As estacas foram mantidas em câmara de nebulização intermitente e, após 75 dias, avaliaram-se as porcentagens de estacas enraizadas, de estacas vivas, de formação de calos e o número de raízes emitidas por estaca. Concluiu-se que as técnicas de estiolamento e ferimento na base da estaca, e a aplicação de AIB não induziram a formação de raízes em estacas lenhosas de caramboleira.The aim of this work was to verify the influence of shading, lesion in cutting bases and application of Indolbutyric acid (IBA in the rooting of star fruit hardwood cuttings. The cuttings were padronized with three buds, two leaves, and 12 cm of length. The experimental design was completely randomized, with the factorial scheme 3 x 4, where the studied factors were the cutting types (shaded hardwood, hardwood with lesion on the base, and hardwood, considered the control and different concentration of IBA (0; 3,000; 6,000, and 9,000 mg L-1. The shading started 45 days before removing the cuttings from the branch, wrapping up the base of the future cuttings with black plastic tape. The incision on the base of

  5. Gadolinium released by the linear gadolinium-based contrast-agent Gd-DTPA decreases the activity of human epithelial Na+ channels (ENaCs).

    Science.gov (United States)

    Knoepp, Fenja; Bettmer, Joerg; Fronius, Martin

    2017-05-01

    Gadolinium-based-contrast-agents (GBCAs) are used for magnetic-resonance-imaging and associated with renal and cardiovascular adverse reactions caused by released Gd 3+ ions. Gd 3+ is also a modulator of mechano-gated ion channels, including the epithelial Na + channel (ENaC) that is expressed in kidney epithelium and the vasculature. ENaC is important for salt-/water homeostasis and blood pressure regulation and a likely target of released Gd 3+ from GBCAs causing the above-mentioned adverse reactions. Therefore this study examined the effect of Gd 3+ and GBCAs on ENaC's activity. Human αβγENaC was expressed in Xenopus laevis oocytes and exposed to Gd 3+ , linear (Gd-DTPA, Magnevist) or cyclic (Dotarem) GBCAs. Transmembrane ion-currents (I M ) were recorded by the two-electrode-voltage-clamp technique and Gd 3+ -release by Gd-DTPA was confirmed by inductively coupled plasma-mass spectrometry. Gd 3+ exerts biphasic effects on ENaC's activity: ≤0.3mmol/l decreased I M which was preventable by DEPC (modifies histidines). Strikingly Gd 3+ ≥0.4mmol/l increased I M and this effect was prevented by cysteine-modifying MTSEA. Linear Gd-DTPA and Magnevist mimicked the effect of ≤0.3mmol/l Gd 3+ , whereas the chelator DTPA showed no effect. Gd 3+ and Gd-DTPA increased the IC 50 for amiloride, but did not affect ENaC's self-inhibition. Interestingly, cyclic Gd-DOTA (Dotarem) increased I M to a similar extent as its chelator DOTA, suggesting that the chelator rather than released Gd 3+ is responsible for this effect. These results confirm Gd 3+ -release from linear Gd-DTPA and indicate that the released Gd 3+ amount is sufficient to interfere with ENaC's activity to provide putative explanations for GBCA-related adverse effects. Copyright © 2017 Elsevier B.V. All rights reserved.

  6. Desenvolvimento de farinhas mistas extrusadas à base de farinha de milho, derivados de levedura e caseína Development of extruded mixed flours based on corn flour, yeast derivates and casein

    Directory of Open Access Journals (Sweden)

    Izabela Dutra Alvim

    2002-08-01

    Full Text Available O presente trabalho teve como principal objetivo o desenvolvimento de farinhas mistas extrusadas à base de farinha de milho, derivados de levedura (autolisado ou extrato e caseína como ingredientes. Utilizou-se a extrusão como processo, sem a pretensão de otimizá-lo, mas buscando as condições que permitissem uma boa operacionalidade do extrusor e produtos extrusados com boas propriedades funcionais, boa aceitação e elevado valor nutritivo. As condições adotadas para o processo foram: alimentação do extrusor, 85g/min; velocidade do parafuso, 150rpm; relação de compressão do parafuso, 1:3; umidade inicial da amostra, 25%; e temperatura de extrusão 170ºC. A melhoria das características nutritivas foi assegurada pela elevação dos teores de proteína e de fibra e diminuição do teor de carboidrato, em relação à farinha sem adição. A extrusão promoveu um adequado grau de expansão radial (GER, aumentou os índices de absorção e de solubilidade em água e diminuiu sensivelmente a viscosidade, em relação à farinha de milho crua.The main objective of the present work was the development of extruded mixed flours based on corn flour, yeast derivatives (autolysate or extract, and casein, as ingredients. The extrusion process was used as unit operation with the purpose of achieving good operation condition for the equipment, and extruded products of good functional properties and acceptability and high nutritive properties. The adopted operational conditions for the process were: feeding rate of the extruder; 85g/min; screw velocity, 150rpm; screw compression ratio, 1:3; sample initial moisture, 25%; and extrusion temperature, 170ºC. Improvement of the nutritional characteristics was assured by the elevation of protein and total fiber content and a decrease in carbohydrate, as related to the corn flour without enrichment. The extrusion promoted an adequate degree of radial expansion (DRE, increased the indexes of water

  7. Towards an ecological index for tropical soil quality based on soil macrofauna Em busca de um índice ecológico para a qualidade de solo tropical com base na macrofauna edáfica

    Directory of Open Access Journals (Sweden)

    Esperanza Huerta

    2009-08-01

    Full Text Available The objective of this work was to construct a simple index based on the presence/absence of different groups of soil macrofauna to determine the ecological quality of soils. The index was tested with data from 20 sites in South and Central Tabasco, Mexico, and a positive relation between the model and the field observations was detected. The index showed that diverse agroforestry systems had the highest soil quality index (1.00, and monocrops without trees, such as pineapple, showed the lowest soil quality index (0.08. Further research is required to improve this model for natural systems that have very low earthworm biomass (O objetivo deste trabalho foi construir um índice simples com base na presença/ausência de diferentes grupos da macrofauna edáfica para auxiliar na determinação da qualidade ecológica dos solos. O índice foi testado com dados de 20 locais do sul e centro do Estado de Tabasco, México, e foi observada uma correlação positiva entre o dados gerados pelo modelo e pelas observações de campo. O índice de qualidade de solo mostrou que diversos sistemas agroflorestais tiveram a mais alta qualidade de solo (1,0 e que os monocultivos sem árvores, como o de abacaxi, apresentaram a qualidade de solo mais baixa (0,08. Este modelo precisa ser melhor desenvolvido para ser aplicado eficientemente em sistemas que apresentam naturalmente baixas densidades de minhocas (<10 g m-2 e número elevado de espécies de minhocas (5-7, como ocorre em solos de floresta tropical, cujo índice de qualidade de solo apresentou valores médios (0,5. A aplicação desse índice precisará de um guia ilustrado para os seus usuários. Mais estudos são necessários para testar o seu emprego por fazendeiros.

  8. Band gap modification and ferroelectric properties of Bi0.5(Na,K0.5TiO3-based by Li substitution

    Directory of Open Access Journals (Sweden)

    Ngo Duc Quan

    2014-01-01

    Full Text Available We report on the reduction of band gap in Bi0.5(Na0.82-xLixK0.180.5(Ti0.95Sn0.05O3 from 2.99 eV to 2.84 eV due to the substitutions of Li+ ions to Na+ sites. In addition, the lithium substitution samples exhibit an increasing of the maximal polarizations from 21.8 to 25.7 μC/cm2. The polarization enhancement of ferroelectric and reduction of the band gaps are strongly related to the Li substitution concentration as evaluated via the electronegative between A-site and oxygen and tolerance factor. The results are promising for photovoltaic and photocatalytic applications.

  9. Relações intra-institucionais na Internet: um estudo exploratório com base em metodologias webométricas

    Directory of Open Access Journals (Sweden)

    Pamela Barreto Lang

    Full Text Available Como uma abordagem inicial para um estudo mais aprofundado sobre a imagem e o impacto da Fundação Oswaldo Cruz na Web, este artigo investiga as correlações entre os sites das unidades finalísticas da Instituição localizada no estado do Rio de Janeiro. A metodologia utilizada baseou-se nas análises de co-link e interlink, e na formação de agrupamentos (clustering analysis. Os dados apontaram para quatro agrupamentos distintos e uma Unidade isolada, além de um baixo nível de integração entre os sites estudados.

  10. Superconducting instabilities and quasipartical interference in the LiFeAs and Co-doped NaFeAs iron-based superconductors

    Energy Technology Data Exchange (ETDEWEB)

    Altenfeld, Dustin; Ahn, Felix; Eremin, Ilya [Institut fuer Theoretische Physik III, Ruhr-Universitaet Bochum, D-44801 Bochum (Germany); Borisenko, Sergey [Leibniz-Institute for Solid State Research, IFW-Dresden, D-01171 Dresden (Germany)

    2015-07-01

    We analyze and compare the structure of the pairing interaction and superconducting gaps in LiFeAs and Co-doped NaFeAs by using the ten-orbital tight-binding model, derived from ab initio LDA calculations with hopping parameters extracted from the fit to ARPES experiments. We discuss the phase diagram and experimental probes to determine the structure of the superconducting gap in these systems with special emphasis on the quasiparticle interference, computed using the T-matrix approximation. In particular, we analyze how the superconducting state with opposite sign of the gaps on the two inner hole pockets in LiFeAs evolve upon changing the parameters towards NaFeAs compound.

  11. Aptamer biosensor for Salmonella typhimurium detection based on luminescence energy transfer from Mn2 +-doped NaYF4:Yb, Tm upconverting nanoparticles to gold nanorods

    Science.gov (United States)

    Cheng, Keyi; Zhang, Jianguo; Zhang, Liping; Wang, Lun; Chen, Hongqi

    2017-01-01

    A highly sensitive luminescent bioassay for the detection of Salmonella typhimurium was fabricated using Mn2 +-doped NaYF4:Yb,Tm upconversion nanoparticles (UCNPs) as the donor and gold nanorods (Au NRs) as the acceptor and utilizing an energy transfer (LET) system. Mn2 +-doped NaYF4:Yb,Tm UCNPs with a strong emission peak at 807 nm were obtained by changing the doped ion ratio. Carboxyl-terminated Mn2 +-doped NaYF4:Yb,Tm UCNPs were coupled with S. typhimurium aptamers, which were employed to capture and concentrate S. typhimurium. The electrostatic interactions shorten the distance between the negatively charged donor and the positively charged acceptor, which results in luminescence quenching. The added S. typhimurium leads to the restoration of luminescence due to the formation of UCNPs-aptamers-S. typhimurium, which repels the UCNPs-aptamers from the Au NRs. The LET system does not occur because of the nonexistence of the luminescence emission band of Mn2 +-doped NaYF4:Yb,Tm UCNPs, which had large spectral overlap with the absorption band of Au NRs. Under optimal conditions, the linear range of detecting S. typhimurium was 12 to 5 × 105 cfu/mL (R = 0.99). The limit of detection for S. typhimurium was as low as 11 cfu/mL in an aqueous buffer. The measurement of S. typhimurium in milk samples was satisfied in accordance with the plate-counting method, suggesting that the proposed method was of practical value in the application of food security.

  12. Synthesis and tunable luminescence properties of Eu2+ and Tb3+-activated Na2Ca4(PO4)3F phosphors based on energy transfer

    International Nuclear Information System (INIS)

    Zhou, Jun; Xia, Zhiguo; You, Hongpeng; Shen, Kai; Yang, Mengxia; Liao, Libing

    2013-01-01

    A series of color-tunable blue–green emitting Na 2 Ca 4 (PO 4 ) 3 F:Eu 2+ ,Tb 3+ phosphors were prepared by a high temperature solid-state reaction. Their luminescence properties reveal that there is an efficient energy transfer from Eu 2+ to Tb 3+ ions via a dipole–quadrupole mechanism where Eu 2+ ions exhibit a strong excitation band in near ultraviolet (UV) region, matching well with the dominant emission band of near UV (350–420 nm) LED chips, and Eu 2+ and Tb 3+ ions can give characteristic blue and green emission light. The varied color of the phosphors from blue to green can be achieved by properly tuning the relative ratio of Eu 2+ to Tb 3+ dopant through the energy transfer from Eu 2+ to Tb 3+ ions. Thermal quenching luminescence results reveal that Na 2 Ca 4 (PO 4 ) 3 F:Eu 2+ ,Tb 3+ exhibits good thermal stability. These results demonstrate that Tb 3+ ion with low 4f–4f absorption efficiency in near UV region can play the role of an activator in narrow green-emitting phosphor through efficient energy feeding by allowing 4f–5d absorption of Eu 2+ with high oscillator strength. The present Eu 2+ –Tb 3+ codoped Na 2 Ca 4 (PO 4 ) 3 F phosphor will have potential application for the near UV white LEDs. - Highlights: ► Color-tunable blue–green Na 2 Ca 4 (PO 4 ) 3 F:Eu 2+ ,Tb 3+ phosphors were prepared. ► Eu 2+ –Tb 3+ energy transfer process and mechanism discussed. ► Thermal quenching properties of blue and green phosphors were studied.

  13. The Electrogenic Na+/K+ Pump Is a Key Determinant of Repolarization Abnormality Susceptibility in Human Ventricular Cardiomyocytes: A Population-Based Simulation Study

    Directory of Open Access Journals (Sweden)

    Oliver J. Britton

    2017-05-01

    Full Text Available Background: Cellular repolarization abnormalities occur unpredictably due to disease and drug effects, and can occur even in cardiomyocytes that exhibit normal action potentials (AP under control conditions. Variability in ion channel densities may explain differences in this susceptibility to repolarization abnormalities. Here, we quantify the importance of key ionic mechanisms determining repolarization abnormalities following ionic block in human cardiomyocytes yielding normal APs under control conditions.Methods and Results: Sixty two AP recordings from non-diseased human heart preparations were used to construct a population of human ventricular models with normal APs and a wide range of ion channel densities. Multichannel ionic block was applied to investigate susceptibility to repolarization abnormalities. IKr block was necessary for the development of repolarization abnormalities. Models that developed repolarization abnormalities over the widest range of blocks possessed low Na+/K+ pump conductance below 50% of baseline, and ICaL conductance above 70% of baseline. Furthermore, INaK made the second largest contribution to repolarizing current in control simulations and the largest contribution under 75% IKr block. Reversing intracellular Na+ overload caused by reduced INaK was not sufficient to prevent abnormalities in models with low Na+/K+ pump conductance, while returning Na+/K+ pump conductance to normal substantially reduced abnormality occurrence, indicating INaK is an important repolarization current.Conclusions: INaK is an important determinant of repolarization abnormality susceptibility in human ventricular cardiomyocytes, through its contribution to repolarization current rather than homeostasis. While we found IKr block to be necessary for repolarization abnormalities to occur, INaK decrease, as in disease, may amplify the pro-arrhythmic risk of drug-induced IKr block in humans.

  14. Análise de Sistemas de Geração de Energia Elétrica com Base na Pegada Ecológica Modificada

    Directory of Open Access Journals (Sweden)

    Bruno Silva de Carvalho

    2011-08-01

    Full Text Available O presente trabalho determina a Pegada Ecológica modificada e a Capacidade de Carga (Zhao et al., 2004 de três sistemas de geração de energia elétrica com uso de combustíveis renováveis e as compara. Foram estudados os sistemas de Utilização de Resíduos Sólidos Urbanos em um Aterro Sanitário na cidade de São Paulo (Frimaio, 2011, Estação de Tratamento de Efluentes na cidade de Uppsala na Suécia (Bjorklund, et al., 2001 e uma Usina Autônoma localizada em São Paulo (Silva, 2006. Os resultados obtidos apontam que o sistema de Aproveitamento de resíduos apresenta melhor performance com relação ao sistema de Estação de Tratamento de Esgoto a Usina Autônoma.

  15. Effect of the raw material type and the reaction time on the synthesis of halloysite based Zeolite Na-P1

    Science.gov (United States)

    Meftah, Mahdi; Oueslati, Walid; Chorfi, Nejmeddine; Ben Haj Amara, Abdesslem

    Zeolites are currently one of the most important classes of inorganic materials because of their multiple applications not only as ions exchangers and molecular sieves, but also as catalysts. This works focus the synthesis and the characterization of Zeolite Na-P1 using halloysite (collected near Ain Khemouda, western Tunisia) as the starting material. Two parameters, such as the host materials type (natural or treated) and the reaction time, involved in the synthesis process are investigated. The intermediate phases and final products were characterized by X-ray diffraction, Infrared IR spectroscopy, scanning electron microscopy and high-resolution 29Si and 27Al MAS NMR. Obtained results show that the hydrothermal synthesis from natural and heated-halloysite leads to formation of homogenous Zeolite Na-P1. The difference in the crystallization/transformation time process is explained by the effect of the dissolution rate of the starting materials in sodium hydroxide solution. In the case of heated halloysite, the synthesis reaction with alkali solution occurs very readily and achieved without prior thermal activation at high temperature. The optimal conditions of Zeolite Na-P1 crystallization, from heated-halloysite, are reached at 120 °C.

  16. Dietas à base de milho e farelo de soja suplementadas com enzimas na alimentação de frangos de corte Corn and soybean meal based diets supplemented with enzymes in feed of broiler chicken

    Directory of Open Access Journals (Sweden)

    Delma Maria Torres

    2003-02-01

    Full Text Available Com o objetivo de verificar o efeito da adição de enzimas digestivas exógenas em dietas à base de milho e farelo de soja sobre o desempenho de frangos de corte, conduziu-se este experimento. Foram utilizados 819 pintos Hubbard em DIC e esquema fatorial 3 x 2 x 2 + 1 (enzimas, proteínas, níveis de energia e um tratamento testemunha com 3 repetições de 21 aves por parcela. Os níveis de enzimas foram 0,5; 1,0 e 1,5 g/kg de dieta, e os de proteína foram normais (21,18, 19,95 e 19,43% PB e reduzidos (20,54, 19,35 e 18,46% PB; os de energia também foram normais (3000, 3100 e 3200 kcal/kg de EM e reduzidos (2910, 3007 e 3040 kcal/kg de EM, respectivamente, para as fases inicial, de crescimento e final da criação, e para o testemunha, a ração continha níveis normais de EM e PB, sem enzimas. Os fatores avaliados foram ganho de peso, consumo de ração, conversão alimentar e fator europeu de produção. Pelos resultados, verificou-se manutenção do desempenho zootécnico das aves em razão da aplicação de enzimas, constatado pela não significância desses fatores aos 42 dias de idade e pela melhora na conversão alimentar, redução do consumo de ração e maior fator europeu de produção aos 21 dias de idade. O estudo da interação dos níveis de enzima x proteína mostrou que a adição de 0,5 g/kg de enzima na dieta com nível de proteína reduzido resultou em maior ganho de peso das aves. Conclui-se que é viável o uso de enzimas exógenas adicionadas em rações para frangos de corte.The objective of the experiment was verify the effect of the addition of exogen digestive enzymes in corn and soybean meal based diets on performance of broiler chickens. Were used 819 Hubbard chickens in completely randomized design, and 3 x 2 x 2 + 1 check factorial (enzyme, protein and energy levels and one treatment check with 3 replications, of the 21 birds by replicate. Enzyme levels were 0.5, 1.0 and 1.5 g/kg of diet, energy levels were

  17. Synthesis of g-C{sub 3}N{sub 4}-based NaYF{sub 4}:Yb,Tm@TiO{sub 2} ternary composite with enhanced Vis/NIR-driven photocatalytic activities

    Energy Technology Data Exchange (ETDEWEB)

    Cheng, Erjian, E-mail: ejcheng6@gmail.com [Department of Materials Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004 (China); Zhou, Shiqi; Li, Mohua [Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004 (China); Li, Zhengquan, E-mail: zqli@zjnu.edu.cn [Department of Materials Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004 (China); Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004 (China)

    2017-07-15

    Highlights: • The g-C{sub 3}N{sub 4}-based NaYF{sub 4}:Yb,Tm@TiO{sub 2} nanocomposite was fabricated by a facile approach. • The as-prepared composites exhibit enhanced activities under Vis and/or NIR lights. • Upconversion and semiconductor heterojunction lie behind the improved photocatalysis. • Photocatalytic working mechanism of this ternary nanocomposite was proposed. - Abstract: Upconversion (UC) NaYF{sub 4}:Yb,Tm nanocrystals (NCs) are capable of converting low-energy near-infrared (NIR) photons to high-energy ultraviolet (UV) and visible (Vis) photons. Integration of NaYF{sub 4}:Yb,Tm with graphitic carbon nitride (g-C{sub 3}N{sub 4}) can extend the spectral response of g-C{sub 3}N{sub 4} to the NIR range. However, photocatalytic activity of NaYF{sub 4}:Yb,Tm/g-C{sub 3}N{sub 4} is still severely limited by the high recombination rate of photo-generated (PG) electrons and holes (e{sup –}/h{sup +}) in the g-C{sub 3}N{sub 4}. Herein, we report a facile approach to fabricate a ternary nanocomposite consisting of NaYF{sub 4}:Yb,Tm, TiO{sub 2} and g-C{sub 3}N{sub 4}. When NaYF{sub 4}:Yb,Tm NCs were coated with a TiO{sub 2} shell and sequentially assembled with g-C{sub 3}N{sub 4} nanosheets (NSs), a semiconductor heterojunction can be fabricated on the UC particles. The as-prepared nanocomposites possess an enhanced photocatalytic activity under Vis and/or NIR lights due to the formation of heterojunction and UC effect. The ternary nanocomposites have been characterized in detail and their photocatalytic mechanism is proposed. Such kind of ternary nanocomposites may provide a new scenario for the design and synthesis of composite photocatalysts for efficiently utilizing the Vis/NIR lights in environmental remedy.

  18. Bulk modulus of basic sodalite, Na8[AlSiO4]6(OH)2·2H2O, a possible zeolitic precursor in coal-fly-ash-based geopolymers

    KAUST Repository

    Oh, Jae Eun

    2011-01-01

    Synthetic basic sodalite, Na8[AlSiO4] 6(OH)2•2H2O, cubic, P43n, (also known as hydroxysodalite hydrate) was prepared by the alkaline activation of amorphous aluminosilicate glass, obtained from the phase separation of Class F fly ash. The sample was subjected to a process similar to geopolymerization, using high concentrations of a NaOH solution at 90 °C for 24 hours. Basic sodalite was chosen as a representative analogue of the zeolite precursor existing in Na-based Class F fly ash geopolymers. To determine its bulk modulus, high-pressure synchrotron X-ray powder diffraction was applied using a diamond anvil cell (DAC) up to a pressure of 4.5 GPa. A curve-fit with a truncated third-order Birch-Murnaghan equation of state with a fixed K\\'o = 4 to pressure-normalized volume data yielded the isothermal bulk modulus, K o = 43 ± 4 GPa, indicating that basic sodalite is more compressible than sodalite, possibly due to a difference in interactions between the framework host and the guest molecules. © 2010 Elsevier Ltd.

  19. Caracterização de argilas e composição de massas cerâmicas preparadas com base na análise de curvas de consistência de misturas argila-água

    Directory of Open Access Journals (Sweden)

    M. M. T. Moreno

    2016-03-01

    Full Text Available Resumo Os produtos cerâmicos obtidos com argilas naturais são muito variados (tijolos, vasos, pisos e a maioria das matériasprimas possui alto conteúdo de ferro, apresentando tons avermelhados, principalmente após queima. Esta pesquisa estudou argilas utilizadas por uma fábrica de blocos cerâmicos localizada no polo Tatuí-Sorocaba - SP. Na caracterização das mesmas, foram abordados aspectos físico-químicos, geoquímicos, mineralógicos e cerâmicos com o intuito de analisar sua influência na composição de massas, as quais foram formuladas e processadas em laboratório com base na análise da consistência de misturas argila-água. Este método se mostrou promissor para controle de qualidade, melhor aproveitamento dos materiais e alternativas para ajuste da proporção dos componentes de uma massa.

  20. Europlanet NA2 Science Networking

    Science.gov (United States)

    Harri, Ari-Matti; Szego, Karoly; Genzer, Maria; Schmidt, Walter; Krupp, Norbert; Lammer, Helmut; Kallio, Esa; Haukka, Harri

    2013-04-01

    Europlanet RI / NA2 Science Networking [1] focused on determining the major goals of current and future European planetary science, relating them to the Research Infrastructure that the Europlanet RI project [2] developed, and placing them in a more global context. NA2 also enhanced the ability of European planetary scientists to participate on the global scene with their own agenda-setting projects and ideas. The Networking Activity NA2 included five working groups, aimed at identifying key science issues and producing reference books on major science themes that will bridge the gap between the results of present and past missions and the scientific preparation of the future ones. Within the Europlanet RI project (2009-2012) the NA2 and NA2-WGs organized thematic workshops, an expert exchange program and training groups to improve the scientific impact of this Infrastructure. The principal tasks addressed by NA2 were: • Science activities in support to the optimal use of data from past and present space missions, involving the broad planetary science community beyond the "space club" • Science activities in support to the preparation of future planetary missions: Earth-based preparatory observations, laboratory studies, R&D on advanced instrumentation and exploration technologies for the future, theory and modeling etc. • Develop scientific activities, joint publications, dedicated meetings, tools and services, education activities, engaging the public and industries • Update science themes and addressing the two main scientific objectives • Prepare and support workshops of the International Space Science Institute (ISSI) in Bern and • Support Trans National Activities (TNAs), Joined Research Activities (JRAs) and the Integrated and Distributed Information Service (IDIS) of the Europlanet project These tasks were achieved by WG workshops organized by the NA2 working groups, by ISSI workshops and by an Expert Exchange Program. There were 17 official WG

  1. Crystal structure of a sodium, zinc and iron(III-based non-stoichiometric phosphate with an alluaudite-like structure: Na1.67Zn1.67Fe1.33(PO43

    Directory of Open Access Journals (Sweden)

    Jamal Khmiyas

    2015-06-01

    Full Text Available The new title compound, disodium dizinc iron(III tris(phosphate, Na1.67Zn1.67Fe1.33(PO43, which belongs to the alluaudite family, has been synthesized by solid-state reactions. In this structure, all atoms are in general positions except for four, which are located on special positions of the C2/c space group. This structure is characterized by cation substitutional disorder at two sites, one situated on the special position 4e (2 and the other on the general position 8f. The 4e site is partially occupied by Na+ [0.332 (3], whereas the 8f site is entirely filled by a mixture of Fe and Zn. The full-occupancy sodium and zinc atoms are located at the Wyckoff positions on the inversion center 4a (-1 and on the twofold rotation axis 4e, respectively. Refinement of the occupancy ratios, bond-valence analysis and the electrical neutrality requirement of the structure lead to the given composition for the title compound. The three-dimensional framework of this structure consists of kinked chains of edge-sharing octahedra stacked parallel to [10-1]. The chains are formed by a succession of trimers based on [ZnO6] octahedra and the mixed-cation FeIII/ZnII [(Fe/ZnO6] octahedra [FeIII:ZnIII ratio 0.668 (3/0.332 (3]. Continuous chains are held together by PO4 phosphate groups, forming polyhedral sheets perpendicular to [010]. The stacked sheets delimit two types of tunnels parallel to the c axis in which the sodium cations are located. Each Na+ cation is coordinated by eight O atoms. The disorder of Na in the tunnel might presage ionic mobility for this material.

  2. [Determination of calcium, magnesium and potassium in nurtured cell by AAS with quick-pulsed nebulization technique and NaOH base digestion].

    Science.gov (United States)

    Shi, C; Gao, S; Gun, S

    1997-06-01

    The sample is digested with 6% NaOH solution and an amount of 50 microl is used for protein content analysis by the method of Comassie Brilliant Blue G250, the residual is diluted with equal 0.4% Lathanurm-EDTA solution. Its Calcium magensium and potassium content are determined by AAS. With quick-pulsed nebulization technique. When a self-made micro-sampling device is used, 20microl of sample volume is needed and it is only the 1/10 approximately 1/20 of the sample volume required for conventional determination. Sensitivity, precision and rate of recovery agree well with those using regular wet ashing method.

  3. Electrochemical corrosion studies on copper-base waste package container materials in unirradiated 0.1 N NaNO3 at 95 degrees C

    International Nuclear Information System (INIS)

    Akkaya, M.; Verink, E.D. Jr.; Van Konynenburg, R.A.

    1988-05-01

    Three candidate materials were investigated in this study in terms of their electrochemical corrosion behavior in unirradiated 0.1 N NaNO 3 solutions at 95 degrees C. Anodic polarization experiments were conducted to determine the passive current densities, pitting potentials, and other parameters, together with Cyclic Current Reversal Voltammetry tests to evaluate the stability and protectiveness of the passive oxides formed. X-ray diffraction and Auger Electron Spectroscopy were used for identification of the corrosion products as well as Scanning Electron Microscopy for the surface morphology studies. 2 refs., 22 figs., 2 tabs

  4. Efeito de um produto a base de yacon (Smallanthus sonchifolius) na modulação da constipação intestinal

    OpenAIRE

    Sant'anna, Mônica de Souza Lima

    2013-01-01

    O yacon (Smallanthus sonchifolius) é uma planta originária da região dos Andes, composto principalmente por água (85 a 90 % do peso fresco) e carboidratos (90 % da matéria seca), sendo que a maioria são representados pelos fructooligossacarideos (FOS) e inulina, sendo então considerado um alimento prebiótico. Os FOS e a inulina atuam melhorando a microbiota intestinal e os metabólitos benéficos produzidos por essa microbiota atuam positivamente na motilidade intestinal. A constipação intestin...

  5. ECONOMIA CRIATIVA NA PRODUÇÃO CIENTÍFICA BRASILEIRA EM ADMINISTRAÇÃO: MAPEAMENTO BIBLIOMÉTRICO NAS BASES ANPAD, CAPES E SPELL.

    OpenAIRE

    Oliveira, Patricia Grenfell; UFC- Universidade Federal do Ceará; Freitas Filho, William Brito; Ribeiro, Renata Aquino; Cabral, Augusto César Aquino; Santos, Sandra Maria

    2016-01-01

    A economia criativa ganhou grande repercussão nos últimos anos, devido a seu forte papel dinâmico, onde sua principal característica é o impacto de seus bens e serviços em vários setores da economia, o que tem provocado processos de mudanças sociais, políticas, econômicas e organizacionais profundas. Contudo, na perspectiva da gestão, o tema tem sido pouco explorado. Este artigo visa mapear a produção científica brasileira sobre economia criativa, tema que tem se destacado cada vez mais, tant...

  6. Effect of crystal shape, size and reflector type on operation characteristics of gamma-radiation detectors based on CsI(Tl) and CsI(Na) scintillators

    International Nuclear Information System (INIS)

    Globus, M.E.; Grinyov, B.V.; Ratner, M.A.

    1996-01-01

    Operation characteristics of CsI(Tl) and CsI(Na) scintillation detectors, to a large degree connected with light collection in crystals, are calculated for various shapes, sizes and reflecting surface types. Allowance is made for the true light reflection indicatrix which is characterized by the effective mirror constituent of the reflected light, p. Its value , averaged over incidence angle, is used for the classification of reflecting surfaces. Operation characteristics (in particular, spectrometric ones) are found to be essentially dependent on . Tables of operation characteristics, given below, permit one to make inferential conclusions on an optimal combination of the shape, sizes an the reflecting surface version

  7. Corrosion Resistance Behavior of Single-Layer Cathodic Arc PVD Nitride-Base Coatings in 1M HCl and 3.5 pct NaCl Solutions

    Science.gov (United States)

    Adesina, Akeem Yusuf; Gasem, Zuhair M.; Madhan Kumar, Arumugam

    2017-04-01

    The electrochemical behavior of single-layer TiN, CrN, CrAlN, and TiAlN coatings on 304 stainless steel substrate, deposited using state-of-the-art and industrial size cathodic arc PVD machine, were evaluated in 1M HCl and 3.5 pct NaCl solutions. The corrosion behavior of the blank and coated substrates was analyzed by electrochemical impedance spectroscopy (EIS), linear polarization resistance, and potentiodynamic polarization. Bond-coat layers of pure-Ti, pure-Cr, alloyed-CrAl, and alloyed-TiAl for TiN, CrN, CrAlN, and TiAlN coatings were, respectively, first deposited for improved coating adhesion before the actual coating. The average coating thickness was about 1.80 µm. Results showed that the corrosion potentials ( E corr) of the coated substrates were shifted to more noble values which indicated improvement of the coated substrate resistance to corrosion susceptibility. The corrosion current densities were lower for all coated substrates as compared to the blank substrate. Similarly, EIS parameters showed that these coatings possessed improved resistance to defects and pores in similar solution compared to the same nitride coatings developed by magnetron sputtering. The charge transfer resistance ( R ct) can be ranked in the following order: TiAlN > CrN > TiN > CrAlN in both media except in NaCl solution where R ct of TiN is lowest. While the pore resistance ( R po) followed the order: CrAlN > CrN > TiAlN > TiN in HCl solution and TiAlN > CrN > CrAlN > TiN in NaCl solution. It is found that TiAlN coating has the highest protective efficiencies of 79 and 99 pct in 1M HCl and 3.5 pct NaCl, respectively. SEM analysis of the corroded substrates in both media was also presented.

  8. Nação e nacionalismo a partir da experiência brasileira Nation and nationalism based on the Brazilian experience

    Directory of Open Access Journals (Sweden)

    Carlos Lessa

    2008-04-01

    Full Text Available Pensar nação e nacionalismo a partir da experiência brasileira exige um mergulho desde as raízes coloniais até a modernidade. Essa trajetória é marcada por descompassos, e desde o Estado Nacional até a sedimentação da nação e o sentimento de auto-estima com uma "identidade brasileira" transcorre-se mais de um século. Tanto o conceito de Brasil-nação quanto as versões nacionalistas jamais têm alta dramaticidade; as passagens históricas fundamentais - abolição, proclamação da República, Estado Novo - se sucedem com poucos traumas preliminares e, em seqüência, a trajetória opera uma rápida "conservatização". Do ponto de vista econômico, as forças produtivas se desenvolvem dinâmica e intensamente. Apesar da expansão demográfica, da ocupação territorial, da transformação e emergência de novos grupos sociais no campo e na cidade, é preservada a exclusão social de amplas frações da nacionalidade dos benefícios do dinamismo econômico. É ciclotímica a leitura dos nacionais de suas próprias características. A cultura, tanto das elites quanto a popular, fornece chaves para entender as mutações do pensar nacional em relação ao Brasil e o desdobramento de múltiplas características.This essay aims to analyze both Nation and Nationalism concepts according to the viewpoint of brazilian experience, from colonial roots to our times, from national state’s birth to the settlement of the Nation and national self-stee. The main historical landmarks happen with few preliminary traumas and are "conservative-zed". Productive forces develop dynamically; demographic expansion and territory occupation continue as society changes and new groups emerge; however, large population segments keep excluded from the welfare economic development should provide. Natives' self-perception is rather cyclothymical. Both popular and elite’s culture provide the keys to understand the mutations of national thinking about Brazil, as

  9. At NA2

    CERN Multimedia

    1977-01-01

    One of the NA2 calorimeter sections is moved in. The NA2 calorimeter was divided in two halves, to the left and the right of the beam, each half consisting of sheets of passive high Z material interleaved with blades of plastic scintillators. The photo shows on the right, the upstream 'electron' module with eleven lead plates for a total radiation length of 20.

  10. Automated quantitative analysis of in-situ NaI measured spectra in the marine environment using a wavelet-based smoothing technique

    International Nuclear Information System (INIS)

    Tsabaris, Christos; Prospathopoulos, Aristides

    2011-01-01

    An algorithm for automated analysis of in-situ NaI γ-ray spectra in the marine environment is presented. A standard wavelet denoising technique is implemented for obtaining a smoothed spectrum, while the stability of the energy spectrum is achieved by taking advantage of the permanent presence of two energy lines in the marine environment. The automated analysis provides peak detection, net area calculation, energy autocalibration, radionuclide identification and activity calculation. The results of the algorithm performance, presented for two different cases, show that analysis of short-term spectra with poor statistical information is considerably improved and that incorporation of further advancements could allow the use of the algorithm in early-warning marine radioactivity systems. - Highlights: → Algorithm for automated analysis of in-situ NaI γ-ray marine spectra. → Wavelet denoising technique provides smoothed spectra even at parts of the energy spectrum that exhibits strong statistical fluctuations. → Automated analysis provides peak detection, net area calculation, energy autocalibration, radionuclide identification and activity calculation. → Analysis of short-term spectra with poor statistical information is considerably improved.

  11. Solidification of ion exchange resins saturated with Na{sup +} ions: Comparison of matrices based on Portland and blast furnace slag cement

    Energy Technology Data Exchange (ETDEWEB)

    Lafond, E. [CEA, DEN, DTCD, SPDE, F-30207 Bagnols-sur-Cèze cedex (France); Cau dit Coumes, C., E-mail: celine.cau-dit-coumes@cea.fr [CEA, DEN, DTCD, SPDE, F-30207 Bagnols-sur-Cèze cedex (France); Gauffinet, S. [Laboratoire Interdisciplinaire Carnot de Bourgogne UMR 6303 CNRS-Université de Bourgogne, Dijon, France, 9 Av Alain Savary, BP 47870, 21078 Dijon cedex (France); Chartier, D. [CEA, DEN, DTCD, SPDE, F-30207 Bagnols-sur-Cèze cedex (France); Stefan, L. [AREVA, Back End Business Group, Dismantling & Services, 1 Place Jean Millier, 92084 Paris La Défense (France); Le Bescop, P. [CEA, DEN, DPC, SECR, F-91192 Gif-sur-Yvette (France)

    2017-01-15

    This work is devoted to the conditioning of ion exchange resins used to decontaminate radioactive effluents. Calcium silicate cements may have a good potential to encapsulate spent resins. However, certain combinations of cement and resins produce a strong expansion of the final product, possibly leading to its full disintegration. The focus is placed on the understanding of the behaviour of cationic resins in the Na{sup +} form in Portland or blast furnace slag (CEM III/C) cement pastes. During hydration of the Portland cement paste, the pore solution exhibits a decrease in its osmotic pressure, which causes a transient expansion of small magnitude of the resins. At 20 °C, this expansion takes place just after setting in a poorly consolidated material and is sufficient to induce cracks. In the CEM III/C paste, swelling of the resins also occurs, but before the end of setting, and induces limited stress in the matrix which is still plastic. - Highlights: • Solidification of cationic resins in the Na{sup +}-form is investigated. • Portland and blast furnace slag cements are compared. • Deleterious expansion is observed with Portland cement only. • Resin swelling is due to a decrease in the osmotic pressure of the pore solution. • The consolidation rate of the matrix is a key parameter to prevent damage.

  12. Efeito da utilização de gomas na viscosidade e nas características sensoriais de shake à base de farinha de banana verde

    Directory of Open Access Journals (Sweden)

    Roberta Ribeiro Silva

    2018-01-01

    Full Text Available Resumo Este trabalho teve como objetivo testar diferentes proporções de gomas na elaboração de um shake desenvolvido com farinha de banana verde, além de avaliar as suas propriedades organolépticas. Analisaram-se seis formulações com os seguintes ingredientes: farinha de banana verde (FBV, leite em pó integral, sucralose, cacau e diferentes proporções de goma xantana (GX e goma guar (GG, nas proporções (GX:GG: F1 (1:0; F2 (0:1; F3 (1:1; F4 (1:3; F5 (3:1; F6 sem estabilizante. As formulações de shake foram submetidas ao teste de viscosidade, realizado a cada três dias, durante um período de 15 dias. Foi realizada análise sensorial com voluntários, em cabines individuais. A aceitabilidade dos atributos aparência, aroma, sabor, textura e impressão global foi avaliada utilizando-se a escala hedônica de 9 pontos. Foram realizadas análises estatísticas utilizando-se o Teste de Variância (ANOVA e o Teste de Tukey a 5% de probabilidade. O estudo foi importante para demonstrar que a viscosidade dos produtos influencia nas características sensoriais e, dessa forma, interfere na escolha dos consumidores.

  13. Maxwell-Stefan based modelling of ion exchange systems containing common species (Cd"2"+, Na"+) and distinct sorbents (ETS-4, ETS-10)

    International Nuclear Information System (INIS)

    Lito, P. F.; Aniceto, J. P. S.; Silva, C. M.

    2015-01-01

    Cadmium(II) is a toxic hazardous cation, whose presence in the environment causes great concern because of its bioaccumulation in organisms and bio amplification along food chain. Hence, the removal of cadmium compounds from industrial waters and wastewaters is particularly essential, which requires intensive experimental and modelling studies to deal with the problem. In this work, the ion exchange of Cd"2"+ ions from aqueous solution using microporous titanosilicates (ETS-4 and ETS-10) has been modelled using adapted Maxwell-Stefan equations for the ions transport inside the sorbent particles. The fundamentals of the Maxwell-Stefan equations along with correlations for the convective mass transfer coefficients have been used with advantage to reduce the number of model parameters. In the whole, the model was able to represent successfully the kinetic behaviour of 11 independent and very distinct curves of both studied systems (Cd2"+"/Na"+/ETS-4 and Cd"2"+/Na"+/ ETS-10). The predictive capability of the model has been also shown, since several uptake curves were accurately predicted with parameters fitted previously to different sets of experimental data.

  14. Formação continuada para professores de língua portuguesa: interação na base de uma proposta cooperativa?

    Directory of Open Access Journals (Sweden)

    Anderson Carnin

    2016-01-01

    Full Text Available Este artigo dedica-se à discussão da formação continuada de professores em uma perspectiva cooperativa. Para tanto, efetua a análise de um dos pilares do projeto de pesquisa “Por uma formação continuada cooperativa para o desenvolvimento do processo educativo de leitura e produção textual escrita no ensino fundamental”: a noção de interação e sua relação com o conceito de cooperação na formação continuada de professores. Problematiza-se a noção de cooperação no escopo desse projeto e produzem-se reflexões que permitem entender como a interação entre universidade e escola pode produzir novos espaços de interlocução e produção de conhecimento sobre a formação e o trabalho do professor e sua relação com a pesquisa acadêmica. A experiência discutida permite refletir sobre a (resignificação de propostas de formação continuada docente na área de ensino de língua portuguesa a partir do modelo proposto.

  15. Incremento na dissolução da caffeine em base de ammonium acryloyldimethyltaurate/vp copolymer: desenvolvimento farmacotécnico de géis anti-celulite

    OpenAIRE

    Éder Menezes Fernandes; Gabriel Azevedo de Brito Damasceno; Márcio Ferrari; Eduardo Pereira Azevedo

    2015-01-01

    A hidrolipodistrofia ginóide (HLDG), popularmente conhecida como “celulite”, consiste em uma alteração patológica do tecido adiposo e da função veno-linfática. Géis contendo caffeine tem sido empregados no tratamento não-invasivo da HLDG, oferecendo resultados satisfatórios a baixos custos. Devido a baixa hidrossolubilidade da caffeine, este gel apresenta como principal inconveniente a formação de precipitados/grumos, oriundos da precipitação da caffeine na base hidrofílica (gel). Este trabal...

  16. Influência dos cátions lítio (Li + , sódio (Na + e potássio (K + na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

    Directory of Open Access Journals (Sweden)

    I. A. da Silva

    Full Text Available Resumo Os cátions lítio (Li+, sódio (Na+ e potássio (K+ encontram-se em primeiro lugar no plano de seletividade para a obtenção de bentonitas monocatiônicas a partir das policatiônicas, influenciando de forma específica o comportamento reológico dos fluidos de perfuração base água. O objetivo deste trabalho foi estudar a influência do Li+, Na+ e K+ na reologia de bentonitas do estado da Paraíba, Brasil, para uso em fluidos de perfuração à base de água. Os novos depósitos de bentonitas brasileiras foram comparados com base nas suas características químicas, físicas, mineralógicas, propriedades reológicas e de filtração. As amostras de bentonitas foram caracterizadas por meio da composição química através do método clássico, capacidade de troca de cátions, análise granulométrica por difração a laser, difração de raios X e análises térmicas. A reologia das dispersões foi estudada e determinadas as viscosidades aparente, viscosidade plástica e limite de escoamento com base nas normas da API e Petrobras, além dos estudos de inchamento em água e filtrado. Os resultados mostraram uma melhora significativa nas propriedades reológicas e de filtração das dispersões após a aditivação com os carbonatos de lítio e de sódio, nessa ordem, havendo presença de tixotropia nas curvas de fluxo das dispersões de argilas estudadas.

  17. Polarization dependence of Na* + Na* associative ionization revisited

    NARCIS (Netherlands)

    Meijer, H.A.J.; Meulen, H.P. v.d.; Morgenstern, R.; Hertel, I.V.; Meyer, E.; Witte, R.

    1986-01-01

    The dependence of the associative ionization process Na 3 2P3/2 + Na 3 2P3/2 → Na2+ + e- on the polarization of the laser light used for Na excitation was independently investigated in Utrecht and Berlin. The purpose of this paper is to clarify discrepancies between two other earlier experimental

  18. A PARTICIPAÃÃO NA LISTA DE EMPRESAS COM MELHORES PRÃTICAS PARA COM OS FUNCIONÃRIOS E SEU IMPACTO NA PERFORMANCE: UM ESTUDO EMPÃRICO SOB A LÃGICA DA RBV (RESOURCE-BASED VIEW

    Directory of Open Access Journals (Sweden)

    Ludwig Miguel Agurto Berdejo

    2009-09-01

    Full Text Available Neste trabalho empírico, procuram-se evidências do impacto na performance das empresas decorrente da participação da organização na lista de empresas com melhores práticas para com os seus empregados (MPE. O trabalho sustenta-se no construto da resource-based view (RBV da empresa, estruturado em Barney (1991, entendendo a presença da empresa nas listagens de MPE como um recurso idiossincrático e difícil de ser imitado, o que leva a considerar este recurso como uma fonte de vantagem competitiva sustentável. O objetivo deste trabalho é verificar se a presença constante na lista de MPE no período de 2004 a 2006 proporciona uma performance financeira, medida pelo ROA e ROE, e de mercado, medida pelo Q de Tobin, superior em relação a um grupo de empresas comparáveis incluídas dentro de um grupo de controle. O período completo da análise compreende de 2001 a 2006, tendo sido testados 26 pares de empresas. Usando o Teste Wilcoxon, observouse que, para o ano de 2006, as amostras apresentam uma diferença significativa ao nível de 5% para o ROA e de 3% para o ROE evidenciando um melhor desempenho das empresas pertencentes à lista de MPE. Adicionalmente, usando a técnica de dados em painel, observou-se que a variável que denota a quantidade de participações que a empresa possui na listagem das MPE para o período de 2001 a 2006 apresenta significância para um nível menor do que 10%, contribuindo para o modelo do valor da empresa medido pelo Q de Tobin. Desta forma, este trabalho traz evidências que contribuem para demonstrar que a performance foi positivamente impactada pela sustentação de capacidades intangíveis e socialmente complexas. Com a sustentação destas capacidades podendo dificultar a sua imitação por concorrentes atuais e futuros.

  19. Análisis del proceso de minería de datos sobre la base de datos Bioinformática de segmentos de la proteína p53, asociada a la actividad cancerígena

    Directory of Open Access Journals (Sweden)

    Franco Simonetti

    2011-03-01

    Full Text Available Se estudió la utilización de estrategias para afrontar el problema del desbalanceo y la alta dimensionalidad de los registros que habitualmente forman parte de las bases de datos en el área bioinformática. Se tomó como caso de estudio la base de datos de segmentos de la proteína p53; sobre dicha base se construyen modelos con el fin de identificar si corresponden a patrones activos o inactivos. El problema del desbalanceo se abordó a través de una red neuronal no supervisada, y el de la selección de variables para reducir la alta dimensionalidad, a partir de una combinación de métodos con diferentes enfoques. Experimentos preliminares del modelo propuesto en datos estándar muestran resultados promisorios.

  20. Formulação estratégica da manutenção industrial com base na confiabilidade dos equipamentos Strategic formulation of industrial maintenance supported by equipment's reliability

    Directory of Open Access Journals (Sweden)

    Miguel Afonso Sellitto

    2005-04-01

    Full Text Available Este trabalho relata o uso da confiabilidade e da manutenibilidade na formulação de estratégias de manutenção industrial. O método utilizado foi o estudo de dois casos. Inicia-se revisando conceitos ligados a variáveis e processos aleatórios como base para definir conceitos e características de estudos de confiabilidade e de modelagem aplicados na gestão da manutenção industrial. A seguir se descrevem os casos estudados, em que se aplicam técnicas de modelagem de tempos até a falha e até o reparo no estabelecimento de estratégias de manutenção em fábricas do setor metal-mecânico. Com base nos resultados, discute-se o caso, estabelecendo condições para o uso da confiabilidade na formulação estratégica da manutenção, principalmente quanto ao sistema de informações necessárias.This paper reports the use of reliability and maintainability assessments in the strategic formulation of industrial maintenance. The method was a double case study. The paper begins by a theoretical review of related concepts of stochastic variables and processes as a basis to address concepts and features from reliability studies and modeling, suited to use in managing the industrial maintenance. One then describes the two studied cases, in which the reliability techniques were applied, in modeling the times to failure and times to the repair for the sake of settling the strategic formulation of industrial maintenance in metal-mechanic plants. Supported by results, this paper discusses the cases, arising requirements to the use of the reliability, mainly related to the information system.

  1. Avaliação do Índice de Remanescente Adesivo utilizando braquetes com e sem tratamento na base e a interação com três sistemas de colagem Evaluation of Adhesive Remnant Index using conventional mesh bases and sandblasted orthodontic bracket bases and three bonding systems

    Directory of Open Access Journals (Sweden)

    Lilian Maria Brisque Pignatta

    2009-02-01

    Full Text Available OBJETIVO: avaliar o Índice de Remanescente Adesivo (IRA em dentes bovinos após a descolagem de braquetes com e sem tratamento na base. METODOLOGIA: foram utilizados três sistemas de colagem ortodôntica para os dois padrões de base. Os dentes bovinos foram divididos em seis grupos de 40, de acordo com a base do braquete e o sistema de colagem. Vinte e quatro horas após a colagem foram realizados os testes de compressão em uma máquina de ensaios. A avaliação do IRA foi realizada em um estereomicroscópio por três examinadores calibrados. Foi utilizado o teste não paramétrico de Kruskal-Wallis, seguido do método de Dunn, para fazer as comparações múltiplas entre todos os grupos. RESULTADOS E CONCLUSÕES: observou-se que o tratamento das bases dos braquetes com óxido de alumínio não foi determinante para o aumento da adesividade entre o braquete e o adesivo. O grupo em que se utilizou braquetes com tratamento na base e adesivo TXT (3M-Unitek + Transbond Plus SEP (3M-Unitek apresentou a maior parte das fraturas na interface dente-adesivo (escore 4.AIM: To assess the Adhesive Remnant Index (ARI in bovine teeth after debonding mesh bases and sandblasted orthodontic bracket bases. METHODS: Were used three bonding systems for the two standards of base. The bovine teeth were divided into 6 groups of 40, according to the bracket base and to the bonding system. Twenty four hours after bonding they had been carried through shear bond strength tests in a universal testing machine. The assessment of ARI was performed in a stereomicroscopy by three calibrated examiners. It was used the non-parametric Kruskall-Wallis test, followed by Dunn's method, to do the multiple comparisons among all groups. RESULTS AND CONCLUSIONS: It was observed that the aluminum oxide sandblasting bracket bases was not determinative to the increase of the adhesiveness between bracket and adhesive. The group where it was used sandblasted orthodontic bracket bases and

  2. Design and simulation of high resolution optical imaging system based on near-field using solid immersion lens with NA = 2.2

    Science.gov (United States)

    Abbasian, Karim; Sadeghi, Rasool; Sadeghi, Parvin

    2014-03-01

    In this work, by changing annular aperture zones transmittance, we could get a spot size smaller than any reported one by utilizing annular aperture. Where, by dividing the annular aperture to more than three zones and utilizing of Sony corporation Produced SIL that has NA higher than 2, we could improve imaging resolution for radial polarization (RP); also we could decrease the FWHM from around ? to near ?. Here, the FWHM variation, according to the refractive index changing, has decreased to zero for RP. After that, circular polarization (CP) has been introduced to get a spot size less than ?. This image resolution improving can be applied to enhance optical data storage, microscopes and lithographic and other high accurate optical systems.

  3. Microscale 1-3-Type (Na,K)NbO(3)-Based Pb-Free Piezocomposites for High-Frequency Ultrasonic Transducer Applications.

    Science.gov (United States)

    Shen, Zong-Yang; Li, Jing-Feng; Chen, Ruimin; Zhou, Qifa; Shung, K Kirk

    2011-05-01

    Fine-grained Pb-free (Na(0.535)K(0.485))(0.95)Li(0.05)(Nb(0.8)Ta(0.2))O(3) (NKLNT) piezoceramics prepared by spark plasma sintering (SPS) technique was used to fabricate NKLNT/epoxy 1-3 composites with a modified dice-fill method. Because of its good machinability, SPSed NKLNT ceramic rods could be miniaturized to a lateral width of 50 µm. After lapping down to 56 µm in thickness, the composite was used to fabricate an ultrasonic transducer as the active piezoelectric element. This composite transducer showed a bandwidth at -6 dB nearly 90%at a center frequency of 29 MHz, demonstrating that this Pb-free composite thick film is very promising for the fabrication of high-frequency ultrasonic transducers in medical imaging applications.

  4. Hydrolysis of Rice Straw Pretreated by Na2SO3 Over Fe-resin/NaCl

    Directory of Open Access Journals (Sweden)

    YANG Hui

    2017-05-01

    Full Text Available To increase the conversion of rice straw(RS and the yield of products, we employed three methods, which were ultrasonic wave, steam explosion and Na2SO3 pretreatment to pretreat RS(the treated RS noted as CS-RS, ZQ-RS and Na2SO3-RS, respectively and found that Na2SO3 treatment was the best pretreatment method based on XRD, SEM, elemental analysis and content of cellulose, hemicellulose and lignin. The conversion of Na2SO3-RS and the yield of total reducing sugar(TRS and levulinic acid(LA were 97.3%, 29.6% and 13.5%, respectively by 10% Fe-resin in 3.3% NaCl solution under 200 ℃.

  5. Avaliação de empreendimentos habitacionais de interesse social com base na hierarquia de valor percebido pelo usuário

    Directory of Open Access Journals (Sweden)

    Fernanda Sbaraini Bonatto

    Full Text Available A avaliação de empreendimentos tem grande importância no esforço de melhoria da habitação de interesse social, podendo auxiliar na avaliação de resultados e na identificação de erros e acertos ante os objetivos e ações do projeto. No entanto, a diversidade e dinâmica de programas habitacionais e a falta de clareza nos objetivos dos empreendimentos podem dificultar o processo de avaliação desse tipo de produto. Com frequência, as avaliações realizadas nos empreendimentos de habitação de interesse social têm como foco os atributos do produto, sem estabelecer uma conexão com os objetivos esperados. Neste artigo, propõe-se um modelo para estruturar as avaliações de empreendimentos habitacionais de interesse social, adotando uma hierarquia de valor que vincula os atributos às suas consequências de uso e aos objetivos esperados. O modelo não está limitado a um programa habitacional específico e parte da ideia de produto ampliado, ou seja, não está focado apenas no produto habitação. As principais contribuições do estudo referem-se ao mapeamento do produto habitacional e à identificação de influências entre os atributos do produto avaliados e os resultados esperados pelos gestores e percebidos pelos usuários.

  6. Development and validation of a thallium flux-based functional assay for the sodium channel NaV1.7 and its utility for lead discovery and compound profiling.

    Science.gov (United States)

    Du, Yu; Days, Emily; Romaine, Ian; Abney, Kris K; Kaufmann, Kristian; Sulikowski, Gary; Stauffer, Shaun; Lindsley, Craig W; Weaver, C David

    2015-06-17

    Ion channels are critical for life, and they are targets of numerous drugs. The sequencing of the human genome has revealed the existence of hundreds of different ion channel subunits capable of forming thousands of ion channels. In the face of this diversity, we only have a few selective small-molecule tools to aid in our understanding of the role specific ion channels in physiology which may in turn help illuminate their therapeutic potential. Although the advent of automated electrophysiology has increased the rate at which we can screen for and characterize ion channel modulators, the technique's high per-measurement cost and moderate throughput compared to other high-throughput screening approaches limit its utility for large-scale high-throughput screening. Therefore, lower cost, more rapid techniques are needed. While ion channel types capable of fluxing calcium are well-served by low cost, very high-throughput fluorescence-based assays, other channel types such as sodium channels remain underserved by present functional assay techniques. In order to address this shortcoming, we have developed a thallium flux-based assay for sodium channels using the NaV1.7 channel as a model target. We show that the assay is able to rapidly and cost-effectively identify NaV1.7 inhibitors thus providing a new method useful for the discovery and profiling of sodium channel modulators.

  7. Introducing a Hydrogen-Bond Donor into a Weakly Nucleophilic Brønsted Base: Alkali Metal Hexamethyldisilazides (MHMDS, M=Li, Na, K, Rb and Cs) with Ammonia.

    Science.gov (United States)

    Neufeld, Roman; Michel, Reent; Herbst-Irmer, Regine; Schöne, Ralf; Stalke, Dietmar

    2016-08-22

    Alkali metal 1,1,1,3,3,3-hexamethyldisilazide (MHMDSs) are one of the most utilised weakly nucleophilic Brønsted bases in synthetic chemistry and especially in natural product synthesis. Like lithium organics, they aggregate depending on the employed donor solvents. Thus, they show different reactivity and selectivity as a function of their aggregation and solvation state. To date, monomeric LiHMDS with monodentate donor bases was only characterised in solution. Since the first preparation of LiHMDS in 1959 by Wannagat and Niederprüm, all efforts to crystallise monomeric LiHMDS in the absence of chelating ligands failed. Herein, we present ammonia adducts of LiHMDS, NaHMDS, KHMDS, RbHMDS and CsHMDS with unprecedented aggregation motifs: 1) The hitherto missing monomeric key compound in the LiHMDS aggregation architectures. Monomeric crystal structures of trisolvated LiHMDS (1) and NaHMDS (2), showing unique intermolecular hydrogen bonds, 2) the unprecedented tetrasolvated KHMDS (3) and RbHMDS (4) dimers and 3) the disolvated CsHMDS (5) dimer with very close intermolecular Si-CH3 ⋅⋅⋅Cs s-block "agostic" interactions have been prepared and characterised by single-crystal X-ray structure analysis. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  8. NAKUPOVANJE NA SPLETU

    OpenAIRE

    Visenjak, Monika

    2013-01-01

    Nakupovanje na spletu je prihodnost poslovanja. Za podjetja pomeni manjše stroške, lažje prilagajanje tržnim pogojem. Hitreje lahko razvijajo odnose in analizirajo uporabnike, saj jim je dan dostop o nakupnih podatkih uporabnika. Za potrošnike je nakupovanje na spletu možnost hitrega, preprostega in učinkovitega nakupovanja od doma ali pisarne. Pomembno je, da se seznanijo z vsemi informacijami in pogoji spletnih trgovin, saj se lahko le tako izognejo nezadovoljstvu ob nakupu v spletni trgovi...

  9. Na via do Behemoth

    Directory of Open Access Journals (Sweden)

    Gérard Rabinovitch

    2008-06-01

    Full Text Available O momento nazista permanece um enigma impensado de que a cultura contemporânea continua cativa. O autor levanta a hipótese de que a persistência desse enigma e seus estragos duráveis se devem à insistência dos pensamentos político, sociológico e filosófico em construírem o nazismo à luz da metáfora hobbesiana do Leviatã. Propõe retomar a questão do nazismo sob a perspectiva do Behemoth, antônimo do Leviatã. Para tanto, sugere a necessidade de retornar a Freud e à psicanálise, balizas de um possível novo pensamento do político que escrutine a destrutividade nazista. Propõe ainda sondar as homologias entre nazismo, corjas e máfias, com base na figura da " heroicização da violência" que lhes seria comum. E avança um modelo " econômico" : a quimera, suscetível de capturar o caráter heterotópico e heterocrônico de sua construção criminosa.The paths of Behemoth. The Nazi moment remains as the thoughtless enigma of which contemporary culture is still captive. The author raises the hypothesis where the persistency of this enigma and its durable damages are due to the insistence of the political, social and philosophical thoughts in building the Nazism at the view of the Hobbesian metaphor of Leviathan. It is here proposed to resume the Nazism matter under Behemoth's perspective, antonym to Leviathan. For such, it is suggested a necessity to look back at Freud and the psychoanalysis, structured by a possible new political thought which scrutinizes the destructivity of the Nazism. It is also here proposed to gaze at the homologies between Nazism, mafias and gangs, with a base in the figure of " violence as a heroically act" that are their common ground. The author also advances an economical model: the chimera susceptible to capture the heterotopic and heterochronic character of its criminal construction.

  10. Educação de Jovens e Adultos: contribuições de artigos em periódicos brasileiros indexados na base SciELO (2010-2014

    Directory of Open Access Journals (Sweden)

    Fabiana Marini Braga

    Full Text Available RESUMO:Este trabalho apresenta pesquisa bibliográfica sobre temas, abordagens e proposições de 79 artigos referentes à Educação de Jovens e Adultos (EJA disponíveis em periódicos brasileiros indexados na base SciELO (2010-2014. Chama a atenção o quantitativo de publicações do quinquênio superar o da década anterior e a concentração de textos voltados à escolarização. Dentre as proposições, está a de uma política de Estado para a EJA, da Alfabetização ao Ensino Médio, considerando os diferentes contextos marcados pela diversidade, e de oferta/aprimoramento de formação docente. Dentre os temas emergentes, destacam-se: Educação Profissional integrada à Educação Básica; Educação na Prisão; e Educação e Saúde. Identificou-se a presença pouco significativa em relação a Arte, Educação Ambiental e História, com silêncio em Tecnologias da Informação e Comunicação e Geografia. A Educação Popular aparece discretamente, contudo, a problematização de questões teórico-metodológicas remete à reflexão sobre seus princípios na contemporaneidade.

  11. Homocisteína Homocysteine

    Directory of Open Access Journals (Sweden)

    Lindalva Batista Neves

    2004-10-01

    Full Text Available A homocisteína, formada a partir da metionina hepática, é metabolizada nas vias de desmetilação e de transulfuração, sendo que seus valores plasmáticos e urinários refletem a síntese celular. Sua determinação, realizada em jejum e após sobrecarga de metionina, caracteriza as diferenças dessas vias metabólicas, principalmente quando de natureza genética. A hiper-homocisteinemia tem sido associada a maior risco de eventos aterotrombóticos, e a literatura sugere associação causal, independente de outros fatores de risco para doença arterial. Diminuição da homocisteína plasmática para valores normais é seguida de redução significante na incidência de doença aterotrombótica. A relação entre homocisteína e o fígado vem adquirindo importância nos dias atuais, uma vez que alterações das lipoproteínas e da depuração de metionina são comuns em pacientes com doença hepática crônica (hepatocelular e canalicular. O tratamento da hiper-homocisteinemia fundamenta-se na suplementação alimentar e medicamentosa de ácido fólico e vitaminas B6 e B12.Homocysteine, formed from hepatic methionine, is metabolized through the pathways of demethylation and transsulfuration. Its plasmatic and urinary values reflect the cell synthesis. Its determination after fasting and increased infusion of methionine shows the differences of these two metabolic pathways, mainly when it is related to genetic diseases. Hyperhomocysteinemia has been associated with a higher risk of vascular thrombotic events. Several authors suggest a causal relationship between these events independently of other risk factors for vascular diseases. Decrease in plasmatic homocysteine to normal levels is followed by a significant reduction on the incidence of vascular thrombotic events. The correlation between the liver and homocysteine is becoming more important because of the recent findings that alterations of lipoproteins and methionine clearance are

  12. Habit plane-driven P2-type manganese-based layered oxide as long cycling cathode for Na-ion batteries

    Science.gov (United States)

    Luo, Rui; Wu, Feng; Xie, Man; Ying, Yao; Zhou, Jiahui; Huang, Yongxin; Ye, Yusheng; Li, Li; Chen, RenJie

    2018-04-01

    Layered transition metal oxides are considered to be promising candidates as cathode materials for sodium-ion batteries. Herein, a facile solid-state reaction is developed to synthesize hexagons plate-like Na0.67Ni0.25Mn0.75O2+δ (denoted as P2-NNM) material with habit plane formed. The structure of this layered oxide is characterized by XRD, HR-TEM and SAED. The layered material delivers a high reversible capacity of 91.8 mAh g-1 at 0.2 C with a capacity retention of 94.4 % after 280 cycles, superior rate capability and long cycle life (84.2 % capacity retention after 1000 cycle). Ni2+ is an active ion and Ni doping alleviates the Jahn-Teller distortion, and Mn3+/Mn4+ coexist as Mn4+ is desired from the stability perspective. Particularly, CV and XPS results confirm these results. Moreover, the electrode exhibits a quasi-solid-solution reaction during the sodium extraction and insertion. This contribution demonstrates that P2-NNM is a promising cathode electrode for rechargeable long-life sodium-ion batteries.

  13. Temperature-dependent leakage current behavior of epitaxial Bi0.5Na0.5TiO3-based thin films made by pulsed laser deposition

    Science.gov (United States)

    Hejazi, M. M.; Safari, A.

    2011-11-01

    This paper discusses the electrical conduction mechanisms in a 0.88 Bi0.5Na0.5TiO3-0.08 Bi0.5K0.5TiO3-0.04 BaTiO3 thin film in the temperature range of 200-350 K. The film was deposited on a SrRuO3/SrTiO3 substrate by pulsed laser deposition technique. At all measurement temperatures, the leakage current behavior of the film matched well with the Lampert's triangle bounded by three straight lines of different slopes. The relative location of the triangle sides varied with temperature due to its effect on the density of charge carriers and un-filled traps. At low electric fields, the ohmic conduction governed the leakage mechanism. The calculated activation energy of the trap is 0.19 eV implying the presence of shallow traps in the film. With increasing the applied field, an abrupt increase in the leakage current was observed. This was attributed to a trap-filling process by the injected carriers. At sufficiently high electric fields, the leakage current obeyed the Child's trap-free square law suggesting the space charge limited current was the dominant mechanism.

  14. A highly sensitive solid substrate room temperature phosphorimetry for carbaryl detection based on its activating effect on NaIO4 oxidizing fluorescein.

    Science.gov (United States)

    Liu, Jiaming; Huang, Qitong; Liu, Zhen-bo; Lin, Xiaofeng; Zhang, Li-Hong; Lin, Chang-Qing; Zheng, Zhi-Yong

    2014-11-01

    Fluorescein (HFin) could emit strong and stable room temperature phosphorescence (RTP) signal on polyamide membrane (PAM) using Pb(2+) as the ion perturber. Carbaryl could activate effect on NaIO4 oxidating HFin, which caused the RTP signal of the system to quench sharply. The phosphorescence intensity (ΔI p) of activating system higher 3.3 times (119.4/36.0) than that of non-activating system, and is directly proportional to the content of carbaryl. Thus, an activating solid substrate room temperature phosphorimetry (SSRTP) for carbaryl detection has been established. This sensitive (the limit of quantification (LOQ) was 2.0 × 10(-13) g mL(-1)), selective, simple and rapid method has been applied to determine trace carbaryl in water samples with the results consisting with those obtained by fluorimetry, showing its high accuracy. The apparent activation energy (E) and rate constant (k) of this activating reaction were 20.77 kJ mol(-1) and 1.85 × 10(-4) s(-1), respectively. Meanwhile, the mechanism of activating SSRTP for carbaryl detection was also discussed using infrared spectra (IR).

  15. Electro-deposition metallic tungsten coatings in a Na{sub 2}WO{sub 4}-WO{sub 3} melt on copper based alloy substrate

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Y.H., E-mail: dreamerhong77@126.com [School of Materials Science and Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083 (China); Zhang, Y.C.; Liu, Q.Z.; Li, X.L.; Jiang, F. [School of Materials Science and Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083 (China)

    2012-11-15

    Highlights: Black-Right-Pointing-Pointer The tungsten coating (>1 mm) was obtained by electro-deposition method in molten salt. Black-Right-Pointing-Pointer Different thickness tungsten coatings were obtained by using different durations. Black-Right-Pointing-Pointer Good performance of coating was obtained when pulse parameters were modulated. - Abstract: The tungsten coating was prepared by electro-deposition technique on copper alloy substrate in a Na{sub 2}WO{sub 4}-WO{sub 3} melt. The coating's surface and cross-section morphologies as well as its impurities were investigated by XPS, SEM and line analysis. Various plating durations were investigated in order to obtain an optimal coating's thickness. The results demonstrated that the electro-deposited coating was compact, voidless, crackless and free from impurities. The tungsten coating's maximum Vickers hardness was measured to be 520 HV. The tungsten coating's minimum oxygen content was determined to be 0.018 wt%. Its maximum thickness was measured to be 1043.67 {mu}m when the duration of electrolysis was set to 100 h. The result of this study has demonstrated the feasibility of having thicker tungsten coatings on copper alloy substrates. These electrodeposited tungsten coatings can be potentially implemented as reliable armour for the medium heat flux plasma facing component (PFC).

  16. Sintering and crystallization behavior of CaMgSi2O6-NaFeSi2O6 based glass-ceramics

    International Nuclear Information System (INIS)

    Goel, Ashutosh; Kansal, Ishu; Ferrari, Anna Maria; Pascual, Maria J.; Barbieri, Luisa; Bondioli, Federica; Lancellotti, Isabella; Ribeiro, Manuel J.; Ferreira, Jose M. F.

    2009-01-01

    We report on the synthesis, sintering, and crystallization behaviors of a glass with a composition corresponding to 90 mol % CaMgSi 2 O 6 -10 mol % NaFeSi 2 O 6 . The investigated glass composition crystallized superficially immediately after casting of the melt and needs a high cooling rate (rapid quenching) in order to produce an amorphous glass. Differential thermal analysis and hot-stage microscopy were employed to investigate the glass forming ability, sintering behavior, relative nucleation rate, and crystallization behavior of the glass composition. The crystalline phase assemblage in the glass-ceramics was studied under nonisothermal heating conditions in the temperature range of 850-950 deg. C in both air and N 2 atmosphere. X-ray diffraction studies adjoined with the Rietveld-reference intensity ratio method were employed to quantify the amount of crystalline phases, while electron microscopy was used to shed some light on the microstructure of the resultant glass-ceramics. Well sintered glass-ceramics with diopside as the primary crystalline phase were obtained where the amount of diopside varied with the heating conditions.

  17. Riso na epilepsia

    Directory of Open Access Journals (Sweden)

    Edymar Jardim

    1967-06-01

    Full Text Available São estudados três casos de síndrome convulsiva temporal, com manifestações concomitantes de riso na sua fase inicial. As características principais foram a imotivação e á incoercibilidade do riso. Esses sintomas desapareceram com o uso de anticonvulsivantes.

  18. Effects of Combined CCR5/Integrase Inhibitors-Based Regimen on Mucosal Immunity in HIV-Infected Patients Naïve to Antiretroviral Therapy: A Pilot Randomized Trial.

    Directory of Open Access Journals (Sweden)

    Sergio Serrano-Villar

    2016-01-01

    Full Text Available Whether initiation of antiretroviral therapy (ART regimens aimed at achieving greater concentrations within gut associated lymphoid tissue (GALT impacts the level of mucosal immune reconstitution, inflammatory markers and the viral reservoir remains unknown. We included 12 HIV- controls and 32 ART-naïve HIV patients who were randomized to efavirenz, maraviroc or maraviroc+raltegravir, each with fixed-dose tenofovir disoproxil fumarate/emtricitabine. Rectal and duodenal biopsies were obtained at baseline and at 9 months of ART. We performed a comprehensive assay of T-cell subsets by flow cytometry, T-cell density in intestinal biopsies, plasma and tissue concentrations of antiretroviral drugs by high-performance liquid chromatography/mass spectroscopy, and plasma interleukin-6 (IL-6, lipoteichoic acid (LTA, soluble CD14 (sCD14 and zonulin-1 each measured by ELISA. Total cell-associated HIV DNA was measured in PBMC and rectal and duodenal mononuclear cells. Twenty-six HIV-infected patients completed the follow-up. In the duodenum, the quadruple regimen resulted in greater CD8+ T-cell density decline, greater normalization of mucosal CCR5+CD4+ T-cells and increase of the naïve/memory CD8+ T-cell ratio, and a greater decline of sCD14 levels and duodenal HIV DNA levels (P = 0.004 and P = 0.067, respectively, with no changes in HIV RNA in plasma or tissue. Maraviroc showed the highest drug distribution to the gut tissue, and duodenal concentrations correlated well with other T-cell markers in duodenum, i.e., the CD4/CD8 ratio, %CD4+ and %CD8+ HLA-DR+CD38+ T-cells. Maraviroc use elicited greater activation of the mucosal naïve CD8+ T-cell subset, ameliorated the distribution of the CD8+ T-cell maturational subsets and induced higher improvement of zonulin-1 levels. These data suggest that combined CCR5 and integrase inhibitor based combination therapy in ART treatment naïve patients might more effectively reconstitute duodenal immunity, decrease

  19. The rapid-onset dystonia parkinsonism mutation D923N of the Na+, K+-ATPase alpha3 isoform disrupts Na+ interaction at the third Na+ site.

    Science.gov (United States)

    Einholm, Anja Pernille; Toustrup-Jensen, Mads S; Holm, Rikke; Andersen, Jens Peter; Vilsen, Bente

    2010-08-20

    Rapid-onset dystonia parkinsonism (RDP), a rare neurological disorder, is caused by mutation of the neuron-specific alpha3-isoform of Na(+), K(+)-ATPase. Here, we present the functional consequences of RDP mutation D923N. Relative to the wild type, the mutant exhibits a remarkable approximately 200-fold reduction of Na(+) affinity for activation of phosphorylation from ATP, reflecting a defective interaction of the E(1) form with intracellular Na(+). This is the largest effect on Na(+) affinity reported so far for any Na(+), K(+)-ATPase mutant. D923N also affects the interaction with extracellular Na(+) normally driving the E(1)P to E(2)P conformational transition backward. However, no impairment of K(+) binding was observed for D923N, leading to the conclusion that Asp(923) is specifically associated with the third Na(+) site that is selective toward Na(+). The crystal structure of the Na(+), K(+)-ATPase in E(2) form shows that Asp(923) is located in the cytoplasmic half of transmembrane helix M8 inside a putative transport channel, which is lined by residues from the transmembrane helices M5, M7, M8, and M10 and capped by the C terminus, recently found involved in recognition of the third Na(+) ion. Structural modeling of the E(1) form of Na(+), K(+)-ATPase based on the Ca(2+)-ATPase crystal structure is consistent with the hypothesis that Asp(923) contributes to a site binding the third Na(+) ion. These results in conjunction with our previous findings with other RDP mutants suggest that a selective defect in the handling of Na(+) may be a general feature of the RDP disorder.

  20. Dimensional t-factor variation and increase of stability of the ferroelectric state in (Na0.5Bi0.5TiO3-based solid solutions

    Directory of Open Access Journals (Sweden)

    V. M. Ishchuk

    2017-10-01

    Full Text Available The influence of the B-site ion substitutions in (1−x(Bi1∕2Na1∕2TiO3–xBaTiO3 system of solid solutions on the relative stability of the antiferroelectric (AFE and ferroelectric (FE phases has been studied. The ions of zirconium, tin, and (In0.5Nb0.5, (Fe0.5Nb0.5, (Al0.5V0.5 ion complexes have been used as substituting elements. An increase in the concentration of the substituting ion results in a near linear variation in the size of the crystal lattice cell. Along with the cell size variation, a change in the relative stability of the AFE and FE phases takes place according to the changes of the tolerance factor of the solid solution. An increase in the tolerance factor leads to the increase in the temperature of the FE–AFE phase transition, and vice versa. Obtained results indicate the way for raising the temperature of the FE–AFE phase transition in (Bi1∕2Na1∕2TiO3-based solid solutions.

  1. Redução da proteína em dietas para tilápias-do-nilo por meio da suplementação de aminoácidos com base no conceito de proteína ideal Protein reduction in diets for Nile tilapia by amino acids supplementation based on the ideal protein concept

    Directory of Open Access Journals (Sweden)

    José Sérgio Righetti

    2011-03-01

    Full Text Available Este trabalho foi realizado para avaliar os efeitos da redução da proteína da dieta, por meio da suplementação com aminoácidos sintéticos, sobre o desempenho produtivo, a digestibilidade e o diâmetro da fibra muscular de tilápias-do-nilo. Os aminoácidos (lisina, metionina, treonina e arginina foram suplementados de forma a manter o perfil de aminoácidos da dieta-referência. Foram utilizados 160 peixes com peso vivo médio inicial de 105,7 ± 2,5 g, distribuídos em 16 tanques (1 m³ cada e alimentados com dietas contendo 26,74; 25,82; 23,09 ou 22,16% de proteína digestível durante 110 dias. Não foi observado efeito dos níveis de proteína nas dietas sobre o ganho de peso diário, o índice hepatossomático, a gordura visceral, o rendimento de filé, os teores corporais de umidade, proteína bruta e cinzas, o teor de cinzas no filé, a taxa de sobrevivência e o diâmetro das fibras do músculo dorsal. Com a redução dos níveis de proteína na dieta, foi observada redução linear dos coeficientes de digestibilidade aparente da energia bruta, proteína bruta, extrato etéreo e fósforo das dietas. Houve efeito quadrático dos níveis de proteína sobre a conversão alimentar, a taxa de eficiência proteica, a retenção de nitrogênio, o nitrogênio excretado, a umidade no filé, a gordura corporal e no filé e proteína no filé, de modo que os melhores valores foram estimados com 24,53; 24,25; 24,04; 25,15; 24,67; 24,14; 24,34; 25,11% de proteína digestível, respectivamente. É possível reduzir, de 26,74 para 24,53%, a proteína digestível em dietas para tilápias-do-nilo na fase de 100 a 500 g.The objective of this work was to evaluate the effects of reduction of protein in diets for Nile tilapia by supplementation of synthetic amino acids on performance, digestibility and diameter of muscle fiber of Nile tilapias. The amino acids (lysine, methionine, threonine and arginine were supplemented to keep the profile of amino

  2. Educação do campo e pedagogia da alternância no Brasil e na Amazônia: bases históricas

    Directory of Open Access Journals (Sweden)

    Maria Sueli Corrêa dos Prazeres

    2013-11-01

    Full Text Available O artigo tem como objetivo refletir sobre a Educação do Campo e a Pedagogia da Alternância no Brasil e na Amazônia. No primeiro momento retrata o contexto histórico da Educação do Campo, enfocando os desafios do Movimento Por Uma Educação do Canpo destacando a necessidade de políticas públicas para o contexto amazônico, apontando as demandas e as perspectivas da educação para o meio rural. No segundo momento contextualiza a Pedagogia da Alternância focalizando sua origem, questões conceituais, situando a mesma no Estado do Pará. O movimento por uma educação do campo constituído por movimentos sociais que se organizam a partir do campo e que têm apoio de educadores, intelectuais, universidades públicas e organizações não-governamentais. Este movimento, desde a década de 1990, vem constituindo uma discussão teórica sobre a educação do campo como estratégia contra hegemônica frente às políticas do Estado brasileiro direcionadas às populações do campo. Em nosso país o desenvolvimento da Pedagogia da Alternância ganha materialidade como estratégia de inúmeros movimentos sociais organizadas nos Centros Familiares de Formação em Alternância (CEFFAS. É importante enfatizar que a proposição tem sido utilizada como estratégia para garantir a participação de amplos segmentos da sociedade nas decisões e encaminhamentos, garantindo assim, a educação aos filhos dos sujeitos do campo.

  3. Formação de professores com base na lei 10639/03 cultura africana e o legado de eduardo mondlane nos dias atuais

    Directory of Open Access Journals (Sweden)

    Nilce Silva

    2016-02-01

    Full Text Available Segundo Libâneo (2003 deve-se levar em conta para a formação de professores um apanhado de estudos considerados no contexto social, econômico, político e cultural no qual ele está inserido, visto que o exercício profissional docente está sempre relacionado aos fins e às práticas do sistema escolar mais amplo e ao contexto social.  Nesse contexto, merece atenção os chamados “velhos problemas” em relação à formação de professores, que evidenciam desarticulações em diferentes níveis, sendo considerado como o mais preocupante deles, a desarticulação entre teoria e prática, entre o discurso e a ação, o que se configura de grande gravidade no tocante às questões raciais no Brasil.  Sendo assim, vale ressaltar a importância da formação desses profissionais na construção de um currículo que contemple as novas demandas da sociedade brasileira, hoje voltadas para a promoção da equidade social e a atenção para a diversidade cultural. A conseqüência imediata disso é a necessidade de construção teórica de um currículo crítico (APPLE, 1982; GIROUX, 1986; FREIRE & SHOR, 1997, que possibilite ao professor o resgate da cultura que o aluno é portador e não se limite apenas a prescrever o que deve ser ensinado.

  4. Sorption-enhanced water gas shift reaction for high-purity hydrogen production: Application of a Na-Mg double salt-based sorbent and the divided section packing concept

    International Nuclear Information System (INIS)

    Lee, Chan Hyun; Lee, Ki Bong

    2017-01-01

    Highlights: •Na-Mg double salt-based sorbent was used for high-temperature CO 2 sorption. •Divided section packing concept was applied to the SE-WGS reaction. •High-purity H 2 was produced from the SE-WGS reaction with divided section packing. •High-purity H 2 productivity could be further enhanced by modifying packing method. -- Abstract: Hydrogen is considered a promising environmentally benign energy carrier because it has high energy density and produces no pollutants when it is converted into other types of energy. The sorption-enhanced water gas shift (SE-WGS) reaction, where the catalytic WGS reaction and byproduct CO 2 removal are carried out simultaneously in a single reactor, has received considerable attention as a novel method for high-purity hydrogen production. Since the high-purity hydrogen productivity of the SE-WGS reaction is largely dependent on the performance of the CO 2 sorbent, the development of sorbents having high CO 2 sorption capacity is crucial. Recently, a Na-Mg double salt-based sorbent has been considered for high-temperature CO 2 capture since it has been reported to have a high sorption capacity and fast sorption kinetics. In this study, the SE-WGS reaction was experimentally demonstrated using a commercial catalyst and a Na-Mg double salt-based sorbent. However, the SE-WGS reaction with a one-body hybrid solid, a physical admixture of catalyst and sorbent, showed poor reactivity and reduced CO 2 sorption uptake. As a result, a divided section packing concept was suggested as a solution. In the divided section packing method, the degree of mixing for the catalyst and sorbent in a column can be controlled by the number of sections. High-purity hydrogen (<10 ppm CO) was produced directly from the SE-WGS reaction with divided section packing, and the hydrogen productivity was further improved when the reactor column was divided into more sections and packed with more sorbent.

  5. Saberes da docência na educação profissional e tecnológica: um estudo sobre o olhar dos professores The teacher knowledge base concerning Technological and Vocational Education (TVE: an exploration into the teacher's viewpoints

    Directory of Open Access Journals (Sweden)

    José Ângelo Gariglio

    2012-03-01

    Full Text Available Tendo como referência a histórica desregulamentação da docência na Educação Profissional e Tecnológica, além de uma restrita produção científica sobre a matéria, fazemos uma discussão inicial sobre os saberes mobilizados pelos docentes da EP, analisando, a partir das representações dos sujeitos docentes de diversas instituições, os saberes acionados e demandados nas suas atividades educativas e as concepções de formação profissional subjacentes a tais saberes. Autores como Gauthier, Tardif, Lessard, Oliveira e Peterossi ancoram nossas análises, que apontam para a necessidade de se avançar o debate tanto sobre o modelo quanto sobre o lócus da formação desses professores, dando atenção às suas especificidades. Aponta-se para a urgência de definição de políticas de Estado na área: regulamentação do exercício da docência na EP, estratégias de profissionalização, definição de carreiras, salários e avaliação.Having as its reference the historical teaching de-regulation in technological and vocational education, along with a restricted (rare or scarce scientific publication on the matter, we carry out an initial discussion concerning the knowledge base mobilized by the TVE teachers. We do this by means of an analysis of: 1 presentations by teachers from several TVE institutions; 2 the knowledge base activated and/or called into demand by these educational activities. Authors like Gauthier, Tardif, Lessard, Oliveira and Peterossi, strengthen (by way of a theoretical base our analysis, while at the same time making it clear that a debate needs to be launched, as much for the sake of defining the model, as for defining the locus (focal point in the training that TVE teachers receive. Attention needs to be given to the specificities encountered in providing training for teachers training in this field. The urgent need for the state to define its policies in this area, is also pointed out. For example, there is

  6. A Insustentabilidade do Turismo no Brasil e o Sucesso de Praia do Forte: uma análise exploratória com base na nova economia institucional

    Directory of Open Access Journals (Sweden)

    Marcus Alban

    2010-06-01

    -default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt;} @page WordSection1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.WordSection1 {page:WordSection1;} -->

    Resumo

    Baseado no pressuposto de que o turismo é uma rota natural e fácil, a evolução do setor no país, desde os anos 90, tem se pautado por uma estratégia de forte expansão espacial da infra-estrutura. Partindo-se de uma análise do baixo desempenho dessa estratégia, demonstra-se o equívoco desse pressuposto. A conclusão é de que o turismo não tem nada de natural ou fácil. Ao contrário é uma rota bastante complexa, que não pode se desenvolver sem boas estruturas de governança. Face a essa constatação, o artigo apresenta as linhas mestras da Nova Economia Institucional e, com base na mesma, analisa os complexos sistemas de governança das cadeias produtivas do setor. Posteriormente, de posse desse novo referencial, estuda-se a singular estrutura de governança do

  7. Unidades fototérmicas e temperatura-base inferior de frutos de Mangueira Alfa, na Baixada Cuiabana Photothermal units and lower base temperature for alfa mango fruit on the Baixada Cuiabana

    Directory of Open Access Journals (Sweden)

    Marcelo Paes de Barros

    2010-06-01

    Full Text Available O objetivo deste trabalho foi determinar a temperatura-base inferior (Tb a partir da unidade fototérmica (UF para o cultivo experimental de manga Alfa sob condições de cerrado. Foram utilizados dados diários da temperatura do ar disponibilizados pela Estação Agrometeorológica Padre Ricardo Remetter, localizada em Santo Antônio do Leverger-MT (15,8° S e 56,1° W, 140 m, e avaliação sensorial do estádio de maturação dos frutos de manga. A Tb foi determinada pelo método da menor variabilidade das unidades fototérmicas (UF acumuladas do período da floração à colheita dos frutos, variabilidade avaliada pelo coeficiente de variação (cv simulado para diferentes valores da Tb. De julho a novembro de 2007, em três plantas de um pomar demonstrativo irrigado, foram identificados 82 frutos para o acompanhamento do crescimento e maturação. Entre esses frutos, em meados de dezembro de 2007, foi possível identificar 13 frutos que atingiram a maturidade fisiológica, após um período médio de observação de 112 dias. Para exigência fototérmica de 1.878.166,1 UF, encontrou-se Tb de 10 °C, valor consistente com os apresentados na literatura para a cultivar de manga, o que comprova a eficiência do método que combina a ação da temperatura e do fotoperíodo sobre a maturação dos frutos e que confere um caráter mais racional que o método tradicional da soma térmica.In this study was to determine the lower base temperature (Tb for Alfa mango fruit, using the photothermal units (PTU method in cerrado conditions. The meteorological data for the study were acquired from "Padre Ricardo Remetter" meteorological station located at Santo Antonio do Leverger, MT, Brazil (15,8° S and 56,1° W, 140 m, and the fruit data was acquired by sensorial evaluation of mango fruit maturation state. The Tb was determined by less variability of the coefficient of variation (cv method applied to the PTU sum, from flowering to harvest, simulated for

  8. Avaliação da diversidade fenotípica em rambuteiras (Nephelium lappaceum com base na qualidade dos frutos Evaluation of phenotipic diversity in rambutan trees (Nephelium lappaceum based on fruit quality

    Directory of Open Access Journals (Sweden)

    Célio Kersul do Sacramento

    2013-03-01

    Full Text Available O rambotã (Nephelium lappaceum L., fruta originária da Ásia, é cultivado comercialmente no Brasil, nos Estados da Pará e Bahia, mas devido à propagação sexuada, apresenta grande variabilidade para características morfológicas e químicas dos frutos. Visando a identificar potenciais matrizes, foram avaliados, em Ituberá-BA, frutos de 105 genótipos de rambotã com base na coloração da casca, suculência e teor de sólidos solúveis. Nesse grupo de plantas, 80 genótipos (76,2% apresentaram frutos com teor de sólidos solúveis igual ou superior a 16 ºBrix e tiveram uma amostra coletada para análise em laboratório. Após a pesagem, foram identificados 20 genótipos cujos frutos apresentaram peso médio acima de 30 g e foram submetidos às análises físico-químicas. Os genótipos avaliados apresentaram frutos com peso médio de 33,2 g (30,2 a 39,4 g, rendimento do arilo de 42,3% (35,1 a 50,2%, sólidos solúveis de 17,6 ºBrix (15,8 a 19,7 ºBrix e acidez titulável 0,44% (0,19 a 0,86%. A amostra de rambuteiras avaliadas apresentou grande variabilidade fenotípica e permitiu a identificação de 20 19 ou 19,05% do total de genótipos avaliados, cujas características dos frutos atendem aos padrões estabelecidos em outros países (peso acima de 30 g e sólidos solúveis acima de 16 ºBrix.The rambutan (Nephelium lappaceum L. fruit originated from Ásia is commercially growth in the states of Pará and Bahia, Brazil, but due to sexual propagation, it shows great variability to morphological and chemical characteristics of the fruits. In order to select potential matrices, fruits of 105 genotypes of rambutan grown in Ituberá, BA were evaluated, based on fruit size, coloration of epicarp and soluble solids. In this sample, 80 genotypes (76.2% presented fruits with soluble solids rate 16 ºBrix or above and their fruits were analyzed in laboratory. After the weighing were indentified 20 genotypes which presented fruits with average

  9. A base sócio-histórica na construção do protagonista em As Aventuras de Tom Sawyer

    Directory of Open Access Journals (Sweden)

    Ângela Tavares Nates Moreira

    2015-06-01

    Full Text Available A obra The Adventures of Tom Sawyer, escrita pelo autor norte americano Samuel Langhorne Clemens, mais conhecido pelo pseudônimo Mark Twain, é considerada, hoje, a narrativa que inaugurou a literatura infanto-juvenil, no século XIX. Essa narrativa ganha maior expressividade devido a sua escrita de caráter regionalista utilizado pelo autor. Com a publicação de As Aventuras de Tom Sawyer, Mark Twain percorre o ambiente literário, com traços marcados pelo humor, pelo Realismo e pelo Regionalismo. Este trabalho objetiva analisar os fragmentos da fala de Tom e aspectos sócio-históricos de uma época de mudanças.  A finalidade é considerar o processo de transição do protagonista, dentro do romance. Desse modo, foram selecionados alguns fragmentos que revelam pontos Realistas. Após a leitura da obra, foram verificados e extraídos fragmentos representativos do jovem protagonista, tais como crenças religiosas, compreensão de mundo e valores morais. O filtro analítico se pauta no trabalho de teóricos como Bakhtin (2010, Watt (2010 e Blair (1967, entre outros, que contribuíram com informações sobre o desenvolvimento político, cultural e religioso das famílias americanas do Centro-Oeste dos Estados Unidos do século XIX. Serão abordadas as teorias sobre o personagem, a partir das reflexões de Gancho (2006 e Candido (2007. Os vários fragmentos analisados permitiram-nos chegar à conclusão sobre o modo como a transição do jovem protagonista foi influenciada, quais as características que revelam suas preferências e opiniões, e, por acréscimo, verificar que muitas dessas respostas poderão ser constatadas em conformidade com o período da época que, “irrevogavelmente”, são considerados intrínsecos na vida de Tom Sawyer.Palavras-chave: protagonista; regionalismo; realismo; Tom Sawyer.

  10. Indicadores de desempenho na gestão estratégica hoteleira familiar com base no estudo de quatro organizações da região turística da serra gaúcha

    OpenAIRE

    Bittencourt, Rafael Sortica de

    2011-01-01

    O tema deste trabalho é a utilização de ferramentas de avaliação de desempenho financeiras e não financeiras na gestão estratégica hoteleira familiar com base no estudo de quatro organizações da Serra Gaúcha. Para fundamentar o tema, foi feita uma revisão teórica, abordando a administração estratégica, a gestão estratégica hoteleira familiar e sua evolução, até os diferentes modelos de avaliação de desempenho financeiros e não financeiros. As reflexões levam a um problema, onde compreende-se ...

  11. Wytrzymałość pływacka i biegowa studentów kierunku wychowanie fizyczne na podstawie testu Coopera = Endurance swimming and gear students of physical education based on the basis of the Cooper's test

    OpenAIRE

    Jan Banach; Mirosława Cieślicka; Radosław Muszkieta; Walery Zukow; Robert Stępniak

    2015-01-01

    Banach Jan, Cieślicka Mirosława, Muszkieta Radosław, Zukow Walery, Stępniak Robert. Wytrzymałość pływacka i biegowa studentów kierunku wychowanie fizyczne na podstawie testu Coopera = Endurance swimming and gear students of physical education based on the basis of the Cooper's test. Journal of Education, Health and Sport. 2015;5(5):445-462. ISSN 2391-8306. DOI 10.5281/zenodo.18157 http://ojs.ukw.edu.pl/index.php/johs/article/view/2015%3B5%285%29%3A445-462 https://pbn.nauka.gov.pl/work...

  12. Wytrzymałość pływacka i biegowa studentów kierunku wychowanie fizyczne na podstawie testu Coopera = Endurance swimming and gear students of physical education based on the basis of the Cooper's test

    OpenAIRE

    Banach, Jan; Cieślicka, Mirosława; Muszkieta, Radosław; Zukow, Walery; Stępniak, Robert

    2015-01-01

    Banach Jan, Cieślicka Mirosława, Muszkieta Radosław, Zukow Walery, Stępniak Robert. Wytrzymałość pływacka i biegowa studentów kierunku wychowanie fizyczne na podstawie testu Coopera = Endurance swimming and gear students of physical education based on the basis of the Cooper's test. Journal of Education, Health and Sport. 2015;5(5):445-462. ISSN 2391-8306. DOI 10.5281/zenodo.18157 http://ojs.ukw.edu.pl/index.php/johs/article/view/2015%3B5%285%29%3A445-462 https://pbn.nauka.gov.pl/work...

  13. Atletismo na escola : realidade?

    OpenAIRE

    Sampaio, Alessandro Oliveira de

    2012-01-01

    O correr, saltar, lançar e arremessar são elementos básicos do atletismo, sendo fundamentais para o ser humano, devido ao favorecimento do desenvolvimento físico e motor. Sendo um dos conteúdos principais do desporto e da educação física escolar, foi realizado um estudo relacionado à prática do atletismo na escola, na qual o objetivo desta pesquisa foi verificar se entre os professores de educação física da rede pública de ensino fundamental de 5ª a 8ª séries, da cidade satélite de Samambaia ...

  14. Preparing for NA4

    CERN Multimedia

    CERN PhotoLab

    1977-01-01

    Here, in one of the EF workshop, Albert Duchêne works on a pretty piece of mechanics. A few others await to be attended on the left. There are indications that the pipes were meant to house the carbon target (subdivided in eight sections) to be installed inside the toroid magnet of the NA4 experiment. The external strips were designed to possibly correct the magnetic field (???).

  15. Long-Term Efficacy, Tolerability, and Renal Safety of Atazanavir/Ritonavir-based Antiretroviral Therapy in a Cohort of Treatment-Naïve Patients with HIV-1 Infection: the REMAIN Study.

    Science.gov (United States)

    Teófilo, Eugénio; Rocha-Pereira, Nuno; Kuhlmann, Birger; Antela, Antonio; Knechten, Heribert; Santos, Jesús; Jiménez-Expósito, Maria Jesús

    2016-02-01

    Boosted protease inhibitors (PIs), including ritonavir-boosted atazanavir (ATV/r), are a recommended option for the initial treatment of HIV-1 infection based upon clinical trial data; however, long-term real-life clinical data are limited. We evaluated the long-term use of ATV/r as a component of antiretroviral combination therapy in the real-life setting in the REMAIN study. This was an observational cohort study conducted at sites across Germany, Portugal, and Spain. Retrospective historical and prospective longitudinal follow-up data were extracted every six months from medical records of HIV-infected treatment-naïve patients aged ≥ 18 years initiating a first-line ATV/r-containing regimen. Eligible patients (n = 517) were followed up for a median of 3.4 years. The proportion remaining on ATV/r at 5 years was 51.5% with an estimated Kaplan-Meier median time to treatment discontinuation of 4.9 years. Principal reasons for discontinuation were adverse events (15.9%; 8.9% due to hyperbilirubinemia) and virologic failure (6.8%). The Kaplan-Meier probability of not having virologic failure (HIV-1 RNA treatment-emergent major PI resistance occurred. ATV/r was generally well tolerated during long-term treatment with no significant changes in estimated glomerular filtration rate over five years. In a real-life clinical setting over five years, treatment-naïve patients with HIV-1 infection initiating an ATV/r-based regimen showed sustained virologic suppression, an overall treatment persistence rate of 51.5%, an absence of treatment-emergent major PI resistance mutations at virologic failure, a long-term safety profile consistent with that observed in clinical trials, and no significant decline in renal function.

  16. Clues to NaCN formation

    Science.gov (United States)

    Quintana-Lacaci, G.; Cernicharo, J.; Velilla Prieto, L.; Agúndez, M.; Castro-Carrizo, A.; Fonfría, J. P.; Massalkhi, S.; Pardo, J. R.

    2017-11-01

    Context. ALMA is providing us essential information on where certain molecules form. Observing where these molecules emission arises from, the physical conditions of the gas, and how this relates with the presence of other species allows us to understand the formation of many species, and to significantly improve our knowledge of the chemistry that occurs in the space. Aims: We studied the molecular distribution of NaCN around IRC +10216, a molecule detected previously, but whose origin is not clear. High angular resolution maps allow us to model the abundance distribution of this molecule and check suggested formation paths. Methods: We modeled the emission of NaCN assuming local thermal equilibrium (LTE) conditions. These profiles were fitted to azimuthal averaged intensity profiles to obtain an abundance distribution of NaCN. Results: We found that the presence of NaCN seems compatible with the presence of CN, probably as a result of the photodissociation of HCN, in the inner layers of the ejecta of IRC +10216. However, similar as for CH3CN, current photochemical models fail to reproduce this CN reservoir. We also found that the abundance peak of NaCN appears at a radius of 3 × 1015 cm, approximately where the abundance of NaCl, suggested to be the parent species, starts to decay. However, the abundance ratio shows that the NaCl abundance is lower than that obtained for NaCN. We expect that the LTE assumption might result in NaCN abundances higher than the real ones. Updated photochemical models, collisional rates, and reaction rates are essential to determine the possible paths of the NaCN formation. Based on observations carried out with ALMA and the IRAM 30 m Telescope. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. IRAM is supported by INSU/CNRS (France

  17. Effects of H2O/Na2O molar ratio on the strength of alkaline activated ground blast furnace slag-ultrafine palm oil fuel ash based concrete

    International Nuclear Information System (INIS)

    Yusuf, Moruf Olalekan; Megat Johari, Megat Azmi; Ahmad, Zainal Arifin; Maslehuddin, Mohammed

    2014-01-01

    Highlights: • Effects of H 2 O/Na 2 O on GBFS-POFA alkaline activated concrete are investigated. • High H 2 O/Na 2 O contents enhance dissolutions/workability at the expense of strength. • Lower H 2 O/Na 2 O molar ratios aid compressive strength of the products. • Increase in H 2 O/Na 2 O favours the reactivity of Ca and the products molecular bonds. • Low H 2 O/Na 2 O positively affects the microstructural density of the products. - Abstract: Effects of H 2 O/Na 2 O molar ratios (MRs) on the developed alkaline activated pozzolanic solid wastes (PMs)-ultrafine palm oil fuel ash (UPOFA) and ground blast furnace slag (GBFS)-were studied by using the constant mass of combined activators (10 M NaOH aq + Na 2 SiO 3aq of silica-modulus (Ms = SiO 2 /Na 2 O) of 3.3).The free water content (FWC) expressed as FWC/(PMs) varied from 0.02 to 0.1 by mass while the total H 2 O/Na 2 O MRs ranged from 18.9 to 23.1 The findings revealed that increase in H 2 O/Na 2 O MRs negatively affects the strength but positively impact the mixture workability (consistency). The microstructural morphology examination using Scanning Electron Microscope coupled with Energy dispersive spectroscopy (SEM + EDS) reveals the contribution of H 2 O/Na 2 O MRs to the product nature, compactness, and the reactivity of Ca 2+ and Al 3+ while Fourier transform infra-red (FTIR) spectroscopy indicates that H 2 O/Na 2 O ratios contributed to the product amorphousity and carbonation process but sparingly affected its formed polymerized structural units (SiQ n (mAl), n = 2 and 3)

  18. Substituição Parcial do Farelo de Soja pela Farinha de Vísceras de Aves em Dietas Balanceadas com Base na Proteína e em Aminoácidos Totais ou Digestíveis para Frangos de Corte Partial Substitution of Soybean Meal by Poultry Offal Meal in Diets Balanced According to Protein and Total or Digestible Amino Acids for Broilers

    Directory of Open Access Journals (Sweden)

    C Bellaver

    2001-12-01

    Full Text Available A formulação com base no conceito de proteína ideal (PI é mais eficiente quando são usados ingredientes alternativos ao milho (M e ao farelo de soja (FS. Assim, o objetivo desse trabalho foi comparar formulações de dietas utilizando o conceito de PI, usando farinha de vísceras (FV em substituição ao FS, em dietas de frangos de corte. Os tratamentos foram os seguintes: T1 = dieta com 22 % e 20% de proteína bruta (PB nas fases inicial (FI e de crescimento (FC e 3200 kcal/kg de EM durante todo experimento; T2 = energia semelhante a dieta T1 e PI à base de M e FS (1,15% de lisina digestível na FI e 0,90% de lisina digestível na FC; T3=dieta semelhante a T2, com 20 % e 25 % de substituição do FS por FV nas FI e FC, respectivamente; T4=dieta semelhante a T3, com 40 e 50 % de substituição do FS por FV, nas FI e FC, respectivamente; T5=dieta semelhante a T4, porém com balanço por aminoácidos (AA totais (1,10 e 1,00 % de lisina total nas FI e FC, respectivamente. Os resultados permitiram concluir que a formulação com base na PI é melhor do que aquela que considera a PB ou AA totais. A inclusão de 20 % FV na FI e 25 % na FC de frangos de corte, em substituição ao FS, melhorou o desempenho até os 21 dias e não alterou o desempenho até os 42 dias em dietas formuladas dentro do conceito de proteína ideal.Ideal protein (IP concept in feed formulation is more suitable when alternative ingredients to corn (C and soybean meal (SBM are used. Thus, the objective of this paper was to compare diets using IP concept and poultry offal meal (POM in substitution to SBM in broiler diets. The treatments were: T1= diets with 22% and 20 % crude protein (CP in starting phase (SP and growing phase (GP, respectively and 3200 kcal ME/kg all over the experiment; T2= similar energy to T1 and IP diet based on C and SBM (1.15% digestible lysine in SP and 0.90 % in GP; T3= similar diet to T2, with 20% and 25% of substitution of SBM by POM in SP and GP

  19. On the Stability of NaO2 in Na-O2 Batteries.

    Science.gov (United States)

    Liu, Chenjuan; Carboni, Marco; Brant, William R; Pan, Ruijun; Hedman, Jonas; Zhu, Jiefang; Gustafsson, Torbjörn; Younesi, Reza

    2018-04-25

    Na-O 2 batteries are regarded as promising candidates for energy storage. They have higher energy efficiency, rate capability, and chemical reversibility than Li-O 2 batteries; in addition, sodium is cheaper and more abundant compared to lithium. However, inconsistent observations and instability of discharge products have inhibited the understanding of the working mechanism of this technology. In this work, we have investigated a number of factors that influence the stability of the discharge products. By means of in operando powder X-ray diffraction study, the influence of oxygen, sodium anode, salt, solvent, and carbon cathode were investigated. The Na metal anode and an ether-based solvent are the main factors that lead to the instability and decomposition of NaO 2 in the cell environment. This fundamental insight brings new information on the working mechanism of Na-O 2 batteries.

  20. Identidades Homossexuais na Territorialidade Tradicionalista

    Directory of Open Access Journals (Sweden)

    Edipo Djavan dos Reis Göergen

    2015-12-01

    Full Text Available Este artigo apresenta o debate teórico que sustenta a pesquisa de mestrado desenvolvida pelo autor. Tendo por base suas vivências em contextos de tradicionalismo gaúcho, o autor deste trabalho tem percebido a grande quantidade de homossexuais, ou indivíduos que se auto-denominam não-heterossexuais, integrando as atividades artísticas do Movimento Tradicionalista Gaúcho, ou a territorialidade tradicionalista. Interessado em investigar tal fenômeno, o autor tem desenvolvido o projeto de pesquisa “Os Espaços Paradoxais de Relações Homoeróticas na Territorialidade Tradicionalista”, sob orientação do prof. Dr. Benhur Pinós da Costa, no Programa de Pós-Graduação em Geografia (UFSM. Para que essa pesquisa seja realizada, levam-se em conta as relações de gênero e de sexualidade que estão envolvidas no tema. Dessa forma, por ainda se tratarem de temáticas tidas como insignificantes na sociedade em geral e marginalizadas no campo científico, para que o presente trabalho fosse empreendido, buscou-se amparo teórico nas geografias feministas e queer, segmentos contemporâneos da ciência geográfica.

  1. O problema do conhecimento verdadeiro na epidemiologia

    Directory of Open Access Journals (Sweden)

    Ayres José Ricardo de Carvalho Mesquita

    1992-01-01

    Full Text Available São examinadas as bases filosóficas da validação do conhecimento científico, com o intuito de estabelecer uma visão crítica a respeito da adoção das proposições de Popper na epidemiologia. Ressalta-se o caráter conservador que resulta das limitações técnicas implicadas na sua adoção, não obstante o evidente aumento da racionalidade e da criatividade heurística que propicia.

  2. Advancement of technology towards developing Na-ion batteries

    Science.gov (United States)

    Jamesh, Mohammed Ibrahim; Prakash, A. S.

    2018-02-01

    The Na-ion-batteries are considered much attention for the next-generation power-sources due to the high abundance of Na resources that lower the cost and become the alternative for the state of the art Li-ion batteries in future. In this review, the recently reported potential cathode and anode candidates for Na-ion-batteries are identified in-light-of-their high-performance for the development of Na-ion-full-cells. Further, the recent-progress on the Na-ion full-cells including the strategies used to improve the high cycling-performance (stable even up-to 50000 cycles), operating voltage (even ≥ 3.7 V), capacity (>350 mAhg-1 even at 1000 mAg-1 (based-on-mass-of-the-anode)), and energy density (even up-to 400 Whkg-1) are reviewed. In addition, Na-ion-batteries with the electrodes containing reduced graphene oxide, and the recent developments on symmetric Na-ion-batteries are discussed. Further, this paper identifies the promising Na-ion-batteries including the strategies used to assemble full-cell using hard-carbon-anodes, Na3V2(PO4)3 cathodes, and other-electrode-materials. Then, comparison between aqueous and non-aqueous Na-ion-batteries in terms of voltage and energy density has been given. Later, various types of electrolytes used for Na-ion-batteries including aqueous, non-aqueous, ionic-liquids and solid-state electrolytes are discussed. Finally, commercial and technological-developments on Na-ion-batteries are provided. The scientific and engineering knowledge gained on Na-ion-batteries afford conceivable development for practical application in near future.

  3. Incremento na dissolução da caffeine em base de ammonium acryloyldimethyltaurate/vp copolymer: desenvolvimento farmacotécnico de géis anti-celulite

    Directory of Open Access Journals (Sweden)

    Éder Menezes Fernandes

    2015-09-01

    Full Text Available A hidrolipodistrofia ginóide (HLDG, popularmente conhecida como “celulite”, consiste em uma alteração patológica do tecido adiposo e da função veno-linfática. Géis contendo caffeine tem sido empregados no tratamento não-invasivo da HLDG, oferecendo resultados satisfatórios a baixos custos. Devido a baixa hidrossolubilidade da caffeine, este gel apresenta como principal inconveniente a formação de precipitados/grumos, oriundos da precipitação da caffeine na base hidrofílica (gel. Este trabalho tem como objetivo o incremento na dissolução da caffeine em gel de Ammonium Acryloyldimethyltaurate/VP Copolymer, através da adição de adjuvantes como o citric acid e o sodium benzoate, além de solução hidroalcoólica, empregada como co-solvente da caffeine. O incremento na dissolução da caffeine foi verificado através da determinação do seu teor nos géis. Além disso, todas as amostras foram submetidas a análises macroscópicas e determinações de pH e viscosidade. A análise macroscópica permitiu a nítida visualização dos precipitados/grumos nos géis preparados sem os adjuvantes, enquanto que o emprego dos mesmos originou géis sem a presença de precipitados. A determinação do teor de caffeine demonstrou que os adjuvantes e co-solvente quase dobraram a concentração deste ativo nos géis. O pH do gel e a concentração de citric acid não influenciaram na dissolução da caffeine. Por outro lado, esses parâmetros influenciaram negativamente na viscosidade dos géis, o que parece ter sido ocasionado pela instabilidade do ammonium acryloyldimethyltaurate/VP copolymer em valores baixos de pH. Com isso, o aumento na dissolução da caffeine no gel anti-celulite parece ter sido ocasionada pela formação de sais hidrossolúveis com os adjuvantes empregados.Palavras-chave: Hidrolipodistrofia ginóide. Gel redutor. Cafeína. Dissolução. ABSTRACTDissolution enhancement of caffeine in the ammonium

  4. Heterogeneity to Homogeneity: Synthesis, Base Pairing, and Ligation Studies of 4',3'-XyluloNA/RNA and TNA/RNA Chimeric Sequences

    Science.gov (United States)

    Bhowmik, S.; Stoop, M.; Krishnamurthy, R.

    2017-07-01

    Based on the reality of "prebiotic clutter," we herein present an alternate model for pre-RNA to RNA transition, which starts, not with homogeneous-backbone system, but rather with mixtures of heterogeneous-backbone of chimeric "pre-RNA/RNA."

  5. AVALIAÇÃO DAS DIETAS SIMPLIFICADAS E SEMI-SIMPLIFICADAS, COM BASE NA MISTURA DE FORRAGEIRAS, COM E SEM ENZIMAS, PARA COELHOS EM CRESCIMENTO

    Directory of Open Access Journals (Sweden)

    Luiz Carlos Machado

    2012-09-01

    Full Text Available The simplified and half-simplified diets are a new technology that combines economy and welfare intestinal. The main objective of this study was to evaluate the effect of simplified and half-simplified diets, with and without exogenous enzymes, on the productive performance of growing rabbits. A Reference diet, two simplified diets and eight half-simplified diets had been utilized. The main fibrous sources used were the alfalfa hay (ALH, hay from the upper third of the cassava foliage (HUTCF and cassava leaf meal (CLM, using a completely randomized design with 11 treatments and eight repetitions. The enzymes used were the carbohydrases (alpha-galactosidase, galactomanase, xylanase and beta-glucanase and phytase. The consumption of animals fed with diets with high inclusion of CLM was lower than the other. The daily weight gain was higher in animals fed with the reference diet, half-simplified diet based on HUTCF and half-simplified diets based on the mix of ALH and CLM. A positive effect of exogenous enzymes inclusion, on the performance parameters, was not observed. Based on these results we conclude that the simplified and half-simplified diets provide decrease in productive performance. Considering the proportionate economy in the cost of feed, the half simplified based on HUTCF may be an interesting alternative.

  6. Research of Brazilian crude in pilot plant for base oil production; Pesquisa em planta piloto visando valorizar o cru nacional na producao de oleos lubrificantes

    Energy Technology Data Exchange (ETDEWEB)

    Fontes, Anita E.F.; Nogueira, Wlamir S.; Ximenes, Lelia M. de O. [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES); Santos, Claudio A.P. dos [Fundacao Gorceix, Ouro Preto, MG (Brazil)

    2004-07-01

    One of the biggest challenges for PETROBRAS is to find alternative crude oils to produce base oil and wax in its refinery. Duque de Caxias refinery has been using imported crude oil for 31 years living with constants threats to continuity because of the Persian Gulf conflicts. If we analyze the profitability of this business, we can verify that the lubes complex had contributed for the profitability by about 41,9% in 2002, even using imported crude oil. So, if we can incorporate a national crude oil in the actual refinery scheme, we would produce besides strategic gains better profitability for the base oil and wax unit. This paper describes a series of tests performed in the pilot plant, in which we produced base oils and wax using a mixture of imported crude with Brazilian crude oil. The base oils produced were classified as Group I with lower aromatic, Sulphur and basic Nitrogen content. Another great advantage of this alternative is that the light fractions obtained from distillation step can be used as feed to make fuels of better quality, due to the lower sulphur content, thus also reducing the environmental impact. (author)

  7. Eletrencefalograma na síndrome parkinsoniana

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    José Geraldo Camargo Lima

    1973-09-01

    Full Text Available Foram estudados os eletrencefalogramas de 50 pacientes parkinsonianos livres de qualquer antecedente convulsivo, sendo registrados traçados anormais em 40% dos casos. A incidência de traçados anormais foi maior na síndrome parkinsoniana bilateral do que na unilateral (52% e 25%, respectivamente. Entre as anormalidades assinaladas foram as paroxísticas as mais freqüentes (65% dos casos, caracterizando-se predominantemente por surtos de ondas teta. O registro de anormalidades paroxísticas do tipo irritativo encontrado em três casos é salientado. Alterações da atividade de base foram assinaladas em 35% dos pacientes. A idade dos pacientes não parece ter tido importante papel na gênese das anormalidades eletrencefalográficas.

  8. GLOBAL COMMODITY CHAINS NA PERSPECTIVA DE MARKETING

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    Flávio Régio Brambilla

    2014-01-01

    Full Text Available O presente estudo visa a estabelecer uma relação entre as estratégias de canais globais com aspectos do marketing, como a força da marca. Trata-se de conciliar atributos de Estratégia e Marketing. As mudanças econômicas globais levaram a transformações na competição das empresas, obrigando-as a ingressar numa discussão aprimorada acerca das estratégias e competências. Com base na ideia da detenção do conhecimento e das habilidades como verdadeiros diferenciais competitivos, muitos players passam a atuar na gestão do design e da marca como elementos centrais das políticas de negócios, onde a proposição de valor pode ser mais bem definida aos mercados consumidores.

  9. The CERES / NA45 experiment

    CERN Multimedia

    Laurent Guiraud

    2000-01-01

    Ceres is one of the second generation heavy ion experiments at CERN's SPS. It is dedicated to the study of electron-positron pairs in relativistic nuclear collisions. NA45 is one of the seven experiments (NA44, NA45, NA49, NA50, NA52, WA97/NA57 and WA98) involved in CERN's Heavy Ion programme which provided evidence for the existence of a new state of matter, the quark-gluon plasma. In this state, quarks, instead of being bound up into more complex particles such as protons and neutrons, are liberated and roam freely. Theory predicts that this state must have existed at about 10 microseconds after the Big Bang, before the formation of matter as we know it today.

  10. Análisis del proceso de minería de datos sobre la base de datos Bioinformática de segmentos de la proteína p53, asociada a la actividad cancerígena

    Directory of Open Access Journals (Sweden)

    Alejandro Hadad

    2011-11-01

    Full Text Available Se estudió la utilización de estrategias para afrontar el problema del desbalanceo y la alta dimensionalidad de los registros que habitualmente forman parte de las bases de datos en el área bioinformática. Se tomó como caso de estudio la base de datos de segmentos de la proteína p53; sobre dicha base se construyen modelos con el fin de identificar si corresponden a patrones activos o inactivos. El problema del desbalanceo se abordó a través de una red neuronal no supervisada, y el de la selección de variables para reducir la alta dimensionalidad, a partir de una combinación de métodos con diferentes enfoques. Experimentos preliminares del modelo propuesto en datos estándar muestran resultados promisorios.

  11. Kusheh, na minem Fatu, en mi na koko farmer Hello, I am Fatu and I am a cocoa farmer

    NARCIS (Netherlands)

    Witteveen, L.M.; Goris, Margriet; Lie, R.; Ingram, V.J.

    2016-01-01

    This document reports on the development of a prototype Digital Farmer Field School (DFFS) called Kusheh, na minem Fatu, en mi na koko farmer (“Hello, I am Fatu and I am a cocoa farmer”). The DFFS provides an ICT-based alternative to traditional agricultural extension. More specifically, it offers a

  12. Análise bibliométrica da produção científica brasileira sobre Tecnologia de Construção e Edificações na base de dados Web of Science

    Directory of Open Access Journals (Sweden)

    Patrícia Bourguignon Soares

    Full Text Available Resumo Este estudo trata da análise da produção científica brasileira sobre tecnologias de construção e edificações por meio de indicadores bibliométricos. A área foi escolhida em razão de sua relevância para o desenvolvimento econômico do país. A bibliometria é um método de análise quantitativa para a pesquisa científica. Os dados elaborados por meio dos estudos bibliométricos mensuram a contribuição do conhecimento científico derivado das publicações em determinadas áreas. Os indicadores de produção são úteis para o planejamento e a execução de políticas públicas, e para o conhecimento da comunidade científica sobre o sistema em que está inserida. O objetivo deste trabalho é estudar a produção científica brasileira na área da construção e tecnologia da construção civil a partir da análise de artigos científicos publicados em periódicos e anais de congressos indexados na base de dados Web of Science (WoS. Os dados foram coletados utilizando como critério de seleção a categoria "Construction & Building Technology", sendo analisados dados de 910 artigos de autores brasileiros no período de 1982 a 2014. A interpretação dos dados permite confirmar o expressivo crescimento da produção científica brasileira e da grande contribuição da região Sudeste para essa evolução.

  13. Monitorização da força da ondulação na base da arriba (Pessegueiro, SW Portugal. Primeiros resultados

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    Mário Neves

    1997-11-01

    Full Text Available MEASUREMENT OF THE WAVE FORCE AT THE CLIFF BASE (PESSEGUEIRO, SW PORTUGAL. FIRST RESULTS. In this article the characteristicsof a new wave force sensor (EWIN are briefly described. This instrument was bolted to the shore platform of Pessegueiro on a first trial experience in Portugal. The maximum wave force records are also analysed in correlation with the wave climate accured in these occasions.

  14. Envolvimento pulmonar na polimiosite

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    Direndra Hasmucrai

    2010-07-01

    Full Text Available Resumo: Introdução: A polimiosite (PM e a dermatomiosite são classificadas como miopatias inflamatórias idiopáticas. O envolvimento pulmonar por PM é pouco frequente, estando descrito na literatura em cerca de 10% de casos.Os autores apresentam um caso de uma mulher de 75 anos, com queixas de febre, perda ponderal, artralgias, mialgias e diminuição simétrica e proximal da força muscular com impotência funcional dos membros superiores e inferiores, com início um mês antes do internamento. Apresentava infiltrados pulmonares na telerradiografia de tórax. Após estudo exaustivo estabeleceu-se o diagnóstico de envolvimento pulmonar na forma de pneumonia organizativa por PM. Efectuou-se corticoterapia e terapêutica com micofenolato com melhoria clínica, analítica e radiológica. Conclusão: Neste caso, foi a alteração na telerradiografia de tórax numa doente sem sintomatologia respiratória que levou ao estudo exaustivo até ao diagnóstico de PM, realçando mais uma vez a importância da telerradiografia no rastreio de patologias de outros foros. Abstract: Introduction: Polymyositis and dermatomyositis are classified as idiopathic inflammatory myopathies. Interstitial lung disease is rare and is described in the literature in about 10% of cases.The authors describes a case of 75 year old woman presenting with one month evolution of fever, weight loss, arthralgia, myalgia and symmetric and proximal muscle weakness of upper and lower limbs. Nonspecific interstitial changes was found in chest X-ray. After exhaustive study, the diagnosis of pulmonary envolvement in the form of organizing pneumonia by polymyositis, was established. Glucocorticoids and mycophenolate were prescribed with good clinical, analytical and radiological outcome. Conclusion: In this case, it was the changes in the chest X-ray in a patient without respiratory symptomatology, that conducted to exhaustive study to polymyositis diagnosis, enhancing once again the

  15. Active transport of Na/sup +/ by reconstituted Na,K-ATPase

    Energy Technology Data Exchange (ETDEWEB)

    Boldyrev, A.A.; Svinukhova, I.A.

    1987-02-20

    The ability of ATP, CTP, ITP, GTP, and UTP to support ouabain-sensitive accumulation of Na/sup +/ by proteoliposomes with a reconstituted Na/K-pump was investigated. At a low (Na/sup +/)/(K/sup +/) ratio in the medium (20 mM/50 mM), a correlation is observed between the proton-accepting capacity of the nucleotide and its effectiveness as a substrate of active transport. To test the hypothesis of the importance of the presence of a negative charge in the 1-position of the purine (3-pyrimidine) base of the nucleotide for mutual transitions between the Na- and K-conformations of Na,K-ATPase they used two analogs of ATP: N/sub 1/-hydroxy-ATP, possessing proton acceptor capacity, and N/sub 1/-methoxy-ATP, in the molecule of which the negative charge is quenched by a methyl group. The first substrate supports active accumulation of Na/sup +/ in proteoliposomes at the same rate as ATP, whereas the second substrate is relatively ineffective.

  16. Uma abordagem via análise envoltória de dados para o estabelecimento de melhorias em segurança baseadas na FMEA A data envelopment analysis approach to safety improvements based on FMEA

    Directory of Open Access Journals (Sweden)

    Pauli Adriano de Almada Garcia

    2013-03-01

    Full Text Available O presente trabalho apresenta uma abordagem baseada em análise envoltória de dados (Data Envelopment Analysis - DEA para estabelecer direcionamentos de melhoria para os modos de falhas identificados na análise dos modos e efeitos de falha (FMEA. A abordagem tradicional da FMEA baseia-se num número de priorização de riscos que vem sendo alvo de inúmeras críticas embasadas em diversos artigos científicos. No presente trabalho, o número de priorização de risco é baseado em DEA. Por meio desse número de priorização de risco DEA, considerando-se o conceito de fronteira de eficiência, serão identificadas diretrizes de melhoria para os modos de falha com base nos índices de risco estabelecidos pela equipe executora da FMEA. Por meio dos resultados alcançados nas duas aplicações práticas, pode-se demonstrar a eficácia da abordagem proposta para tratar essa classe de problemas.The present study presents a data envelopment analysis (DEA based approach to establish guidelines for the improvement of the failure modes identified by a failure mode and effect analysis (FMEA. The traditional FMEA approach is based on risk priority number (RPN, which has been target of scientific criticism. In the present study, the RPN is based on DEA and considers the concept of efficiency frontier. Based on this concept and on the risk indexes, some improvement directives for the failure modes can be established. The obtained results concerning the two practical applications demonstrate the effectiveness of the proposed approach in dealing with this kind of problem.

  17. INFLUÊNCIA DOS FATORES GEOLÓGICOS, GEOMORFOLÓGICOS E ANTRÓPICOS DA PRODUÇÃO DE FLUXO DE BASE EM PEQUENAS BACIAS HIDROGRÁFICAS NA APA CACHOEIRA DAS ANDORINHAS, OURO PRETO (MG

    Directory of Open Access Journals (Sweden)

    Josefa Clara Monteiro

    2014-08-01

    Full Text Available Neste trabalho objetivou-se estabelecer a influência da geologia, geomorfologia e uso e ocupação do solo no potencial hídrico de pequenas bacias hidrográficas situadas na Área de Proteção Ambiental Estadual da Cachoeira das Andorinhas (APA/CA. Foram selecionados três pares de bacias, cada par com condições geológicas e geomorfológicas semelhantes, mas com graus distintos de interferência antrópica. Utilizando-se dados de chuva e vazão, obtidos durante um ano hidrológico, estabeleceram-se os regimes pluviométricos e fluviométricos e determinaram-se alguns parâmetros hidrológicos, como o fluxo de base pela técnica smoothed mínima e o coeficiente de recessão (α pela técnica matching strip. A análise conjugada destes parâmetros, de índices morfométricos e de dados físico-químicos das águas indicam que as bacias em áreas de relevo mais suave tendem a apresentar menores coeficientes de recessão e maiores volumes de fluxo de base. Portanto, nestas áreas o potencial hídrico é maior, já que a vazão das drenagens se mantém por mais tempo na estação seca. O relevo mais suave, com solo mais espesso e maior tempo de trânsito das águas subterrâneas, também justificam as águas mais redutoras e com maiores condutividades elétricas. Os dados também sugerem que as bacias da área com maiores proporções de florestas tendem a apresentar menores fluxos de base por conta das maiores taxas de evapotranspiração. Os métodos aplicados se mostraram adequados para caracterizar o regime hídrico de pequenas bacias hidrográficas e podem ser importantes para a gestão de recursos hídricos.

  18. Calcificação nos núcleos da base na tomografia computadorizada: correlação clínica em 25 pacientes consecutivos Basal ganglia calcification on computed tomography: clinical characteristics in 25 patients

    Directory of Open Access Journals (Sweden)

    Glória Maria A.S. Tedrus

    2006-03-01

    Full Text Available Analisamos os aspectos clínicos de 25 pacientes consecutivos que apresentaram calcificação nos núcleos da base na tomografia computadorizada (TC de crânio. Esta ocorreu em 0,68% de todos os exames realizados no período. Vinte e três pacientes apresentavam condições clínicas diversas, a saber: cefaléia em 7 casos, acidente vascular cerebral em 5, síndrome extrapiramidal em 2, processo expansivo cerebral em 2, epilepsia, retardo do desenvolvimento neuropsicomotor, demência e trauma de crânio em um caso cada ou outras condições neurológicas em 3. Não havia sintomas neurológicos em 2 casos. Em 15 pacientes (60,0% havia, além da calcificação dos núcleos da base, outras alterações na TC. Correlação clínica foi observada apenas com as outras alterações da TC e não com a calcificação dos núcleos da base, corroborando a hipótese de que esta possa ser um achado incidental.Twenty-five patients presenting basal ganglia calcification were assessed. This finding comprised 0.68% of all skull CT scan carried out during the period. Two patients were neurologically asymptomatic and 23 presented a variety neurological disorders - headache (7 patients, stroke (5 patients, extrapyramidal syndromes (2 patients, tumor (2 patients, epilepsy (1 patient, mental retardation (1 patient, dementia (1 patient, cranial trauma (1 patient, other neurological conditions (3 patients - or were asymptomatic from the neurological point of view (2 patients. Findings in the CT scan other than the basal ganglia calcification were observed in 15 (60% patients. There was a clinical-CT scan correlation in these cases but not in those in which the basal ganglia calcification was an isolated finding. This study highlights the fact that basal ganglia calcification is often a nonspecific finding on CT scan and that it may not be possible to establish a clinical-pathological correlation between them.

  19. Comportamento espectral dos solos na paisagem a partir de dados coletados por sensores terrestre e orbital Spectral response of soils in the landscape based on terrestrial and orbital data acquisition levels

    Directory of Open Access Journals (Sweden)

    José Geraldo de Abreu Sousa Junior

    2008-04-01

    Full Text Available Parte da variabilidade dos índices de produção agrícola está associada com as características do solo e da paisagem. Dessa forma, práticas de manejo, como a adubação, devem levar em consideração esta variabilidade. O sensoriamento remoto é uma ferramenta que pode fornecer, de maneira rápida, informações para o manejo do solo, pois relaciona a radiação eletromagnética com os atributos do solo. Assim, este trabalho teve como objetivo avaliar o comportamento espectral, em dois níveis de aquisição de dados (terrestre e orbital, de diferentes classes de solos ao longo de toposseqüências na região de São Carlos e Ibaté, SP. Para isso, amostras de terra georreferenciadas foram coletadas em 319 pontos, em três profundidades. Em seguida, obtiveram-se os dados radiométricos em laboratório, na faixa espectral entre 450 e 2.500 nm. Os mesmos locais amostrados na camada superficial, no campo, foram avaliados na imagem de satélite. A partir dos resultados obtidos, pode-se concluir que: (a teores de areia grossa, argila e matéria orgânica, e cor tiveram relação com a reflectância dos solos; (b ao longo das vertentes ocorrem variações nos dados espectrais dos solos; e (c solos da mesma ordem taxonômica, porém com classes texturais diferentes, apresentam diferentes comportamentos espectrais, podendo ser discriminados por sensoriamento remoto.Part of agricultural production index variability is associated with soil and landscape characteristics. Management practices such as fertilizer application should therefore take the soil spatial variability into account. Remote sensing is a tool that can provide faster information for soil management because it relates electromagnetic radiation with soil attributes. Thus, this study aimed at evaluating the spectral response, at two data acquisition levels (terrestrial and orbital, of different soil classes across toposequences in the region of São Carlos and Ibaté, SP. For this

  20. Exigência de treonina, com base no conceito de proteína ideal, de alevinos de tilápia-do-nilo Digestible threonine requirement of Nile tilapia fingerlings using ideal protein concept

    Directory of Open Access Journals (Sweden)

    Marcos Antonio Delmondes Bomfim

    2008-12-01

    Full Text Available Avaliou-se o efeito dos níveis de treonina digestível, com base no conceito de proteína ideal, em rações com 1,35% de lisina digestível sobre o desempenho de alevinos de tilápia-do-nilo (Oreochromis niloticus. Utilizaram-se 432 alevinos revertidos de tilápia, linhagem tailandesa, com peso inicial de 1,64 ± 0,03 g, em delineamento inteiramente ao acaso, com seis tratamentos, cada um com seis repetições, e doze peixes por unidade experimental. Os tratamentos consistiram de cinco rações com diversas relações treonina:lisina digestível (69,0; 74,0; 79,0; 84,0 e 89,0% e relação metionina + cistina:lisina digestível de 70,0% e uma ração com relação treonina:lisina digestível de 84,0% e de metionina + cistina:lisina digestível de 75,0%, todas isoenergéticas e isoprotéicas. Os peixes foram mantidos em 36 aquários de 130 L, dotados de abastecimento de água, temperatura controlada e aeração individuais, e alimentados à vontade, seis vezes ao dia, durante 30 dias. Avaliaram-se o desempenho, a composição corporal, as deposições de proteína e gordura e a eficiência de retenção de nitrogênio dos peixes. O consumo de ração, o teor de proteína corporal e a deposição de proteína corporal aumentaram de forma linear de acordo com a relação treonina:lisina na ração, contudo, não foram influenciados pelo aumento da relação metionina + cistina:lisina da ração. Os níveis de treonina total ou digestível que proporcionaram os melhores resultados de desempenho em alevinos de tilápia-do-nilo foram de 1,11 e 0,99%, enquanto os níveis que promoveram melhor deposição de proteína corporal foram de 1,43 e 1,28%, que correspondem às relações treonina:lisina total de 71,0 e 69,0% e treonina:lisina digestível de 90,0 e 89,0%.The effects of digestible threonine levels, based on ideal protein concept in diets with 1.35% of digestible lysine on Nile tilapia (Oreochromis niloticus fingerlings performance. Four hundred

  1. Comprometimento pulmonar na leptospirose

    Directory of Open Access Journals (Sweden)

    Jorge Eduardo Manhães de Carvalho

    1992-03-01

    Full Text Available Em 23 pacientes com leptospirose apresentando comprometimento pulmonar, internados no Hospital Universitário Antônio Pedro da XJFF, Niterói, hemoptise e hemoptóicos foram observados em 21,7% e 30,4%, respectivajnente. Gasometria arterial revelou hipoxemia e hipocapnia na maioria dos casos. Radiografia de tórax em 15 pacientes mostrou comprometimento alveolar em 60%, comprometimento intersticial-reticular em 6%, padrão misto (alveolar e intersticial em20%e ausência de alterações radiológicas em 14%. A necrópsiade 13 pacientes mostrou edema, congestão e hemorragia nos pulmões em 100% dos casos. A hemorragia foi focal em 46% e difusa em 54% dos casos. Houve formação de membrana hialina em 30% e trombos de fibrina em 46% dos pulmões estudados, o que estabelece o diagnóstico da coagulação intravascular disseminada e a ocorrência da síndrome de angústia respiratória na leptospirose.

  2. Effectiveness of Two Web-Based Interventions for Chronic Cancer-Related Fatigue Compared to an Active Control Condition: Results of the "Fitter na kanker" Randomized Controlled Trial.

    Science.gov (United States)

    Bruggeman-Everts, Fieke Z; Wolvers, Marije D J; van de Schoot, Rens; Vollenbroek-Hutten, Miriam M R; Van der Lee, Marije L

    2017-10-19

    Approximately one third of all patients who have been successfully treated for cancer suffer from chronic cancer-related fatigue (CCRF). Effective and easily accessible interventions are needed for these patients. The current paper reports on the results of a 3-armed randomized controlled trial investigating the clinical effectiveness of two different guided Web-based interventions for reducing CCRF compared to an active control condition. Severely fatigued cancer survivors were recruited via online and offline channels, and self-registered on an open-access website. After eligibility checks, 167 participants were randomized via an embedded automated randomization function into: (1) physiotherapist-guided Ambulant Activity Feedback (AAF) therapy encompassing the use of an accelerometer (n=62); (2) psychologist-guided Web-based mindfulness-based cognitive therapy (eMBCT; n=55); or (3) an unguided active control condition receiving psycho-educational emails (n=50). All interventions lasted nine weeks. Fatigue severity was self-assessed using the Checklist Individual Strength - Fatigue Severity subscale (primary outcome) six times from baseline (T0b) to six months (T2). Mental health was self-assessed three times using the Hospital Anxiety and Depression Scale and Positive and Negative Affect Schedule (secondary outcome). Treatment dropout was investigated. Multiple group latent growth curve analysis, corrected for individual time between assessments, showed that fatigue severity decreased significantly more in the AAF and eMBCT groups compared to the psycho-educational group. The analyses were checked by a researcher who was blind to allocation. Clinically relevant changes in fatigue severity were observed in 66% (41/62) of patients in AAF, 49% (27/55) of patients in eMBCT, and 12% (6/50) of patients in psycho-education. Dropout was 18% (11/62) in AAF, mainly due to technical problems and poor usability of the accelerometer, and 38% (21/55) in eMBCT, mainly due to

  3. Aircraft accident report: NASA 712, Convair 990, N712NA, March Air Force Base, California, July 17, 1985, facts and analysis

    Science.gov (United States)

    Batthauer, Byron E.; Mccarthy, G. T.; Hannah, Michael; Hogan, Robert J.; Marlow, Frank J.; Reynard, William D.; Stoklosa, Janis H.; Yager, Thomas J.

    1986-01-01

    On July 17, l985, at 1810 P.d.t., NASA 712, a Convair 990 aircraft, was destroyed by fire at March Air Force Base, California. The fire started during the rollout after the pilot rejected the takeoff on runway 32. The rejected takeoff was initiated during the takeoff roll because of blown tires on the right landing gear. During the rollout, fragments of either the blown tires or the wheel/brake assemblies penetrated a right-wing fuel tank forward of the right main landing gear. Leaking fuel ignited while the aircraft was rolling, and fire engulfed the right wing and the fuselage after the aircraft was stopped on the runway. The 4-man flightcrew and the 15 scientists and technicians seated in the cabin evacuated the aircraft without serious injury. The fire was not extinguished by crash/rescue efforts and the aircraft was destroyed.

  4. As bases teóricas da técnica da recriação do contexto na entrevista cognitiva

    Directory of Open Access Journals (Sweden)

    Luciano Haussen Pinto

    2015-04-01

    Full Text Available In reporting a crime the victims and witnesses have a decisive role. In the area of psychology of testimony, much has been advanced in the methods of investigative interviews, being the Cognitive Interview currently the most consolidated around the world. The aim of this study was to perform a narrative review of the literature about one of the techniques of the Cognitive Interview: context reinstatement. Many studies attribute the success the Cognitive Interview has in optimizing the quantity and quality in recalled information largely to context reinstatement. The theoretical bases of memory were analyzed to explain the mechanisms context reinstatement triggers that favor recall. Its positive effects have direct relation with the notion of context-dependent memory and with the principle of encoding specificity. Finally, we point out some limitations, as well as new ways to use the technique.

  5. Evolution of Microstructure in Rolled Mg-Based Alloy. Textural Aspect / Ewolucja Mikrostruktury W Walcowanym Stopie Na Bazie Mg. Aspekt Teksturowy

    Directory of Open Access Journals (Sweden)

    Drzymała P.

    2015-12-01

    Full Text Available Magnesium alloys are the lightest structural materials, which makes them particularly suitable for use in the aircraft and automotive industry. However, due to hexagonal close-packed crystal structure, resulting in insufficient number of independent slip systems, magnesium alloys exhibit poor formability at room temperature. Conventional methods of work hardening of magnesium alloys requires the temperature about 300°C, which favours simultaneously processes of thermal recovery and grain growth, but decreases beneficial microstructure strengthening effect. Thus, it is a crucial to undertake development of a technology for semi-finished magnesium alloys elements, which will ensure better mechanical properties of the final products by forming desirable microstructure. In the paper we present the development of crystallographic texture of the Mg-based alloy (Mg-AZ31 in the form of pipe extruded at 430°C and subjected to pilger rolling at relatively low temperature.

  6. Development of parallel GPU based algorithms for problems in nuclear area; Desenvolvimento de algoritmos paralelos baseados em GPU para solucao de problemas na area nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Adino Americo Heimlich

    2009-07-01

    Graphics Processing Units (GPU) are high performance co-processors intended, originally, to improve the use and quality of computer graphics applications. Since researchers and practitioners realized the potential of using GPU for general purpose, their application has been extended to other fields out of computer graphics scope. The main objective of this work is to evaluate the impact of using GPU in two typical problems of Nuclear area. The neutron transport simulation using Monte Carlo method and solve heat equation in a bi-dimensional domain by finite differences method. To achieve this, we develop parallel algorithms for GPU and CPU in the two problems described above. The comparison showed that the GPU-based approach is faster than the CPU in a computer with two quad core processors, without precision loss. (author)

  7. Transmural gradients in Na/K pump activity and [Na+]I in canine ventricle.

    Science.gov (United States)

    Gao, J; Wang, W; Cohen, I S; Mathias, R T

    2005-09-01

    There are well-documented differences in ion channel activity and action potential shape between epicardial (EPI), midmyocardial (MID), and endocardial (ENDO) ventricular myocytes. The purpose of this study was to determine if differences exist in Na/K pump activity. The whole cell patch-clamp was used to measure Na/K pump current (I(P)) and inward background Na(+)-current (I(inb)) in cells isolated from canine left ventricle. All currents were normalized to membrane capacitance. I(P) was measured as the current blocked by a saturating concentration of dihydro-ouabain. [Na(+)](i) was measured using SBFI-AM. I(P)(ENDO) (0.34 +/- 0.04 pA/pF, n = 17) was smaller than I(P)(EPI) (0.68 +/- 0.09 pA/pF, n = 38); the ratio was 0.50 with I(P)(MID) being intermediate (0.53 +/- 0.13 pA/pF, n = 19). The dependence of I(P) on [Na(+)](i) or voltage was essentially identical in EPI and ENDO (half-maximal activation at 9-10 mM [Na(+)](i) or approximately -90 mV). Increasing [K(+)](o) from 5.4 to 15 mM caused both I(P)(ENDO) and I(P)(EPI) to increase, but the ratio remained approximately 0.5. I(inb) in EPI and ENDO were nearly identical ( approximately 0.6 pA/pF). Physiological [Na(+)](i) was lower in EPI (7 +/- 2 mM, n = 31) than ENDO (12 +/- 3 mM, n = 29), with MID being intermediate (9 +/- 3 mM, n = 22). When cells were paced at 2 Hz, [Na(+)](i) increased but the differences persisted (ENDO 14 +/- 3 mM, n = 10; EPI 9 +/- 2 mM, n = 10; and MID intermediate, 11 +/- 2 mM, n = 9). Based on these results, the larger I(P) in EPI appears to reflect a higher maximum turnover rate, which implies either a larger number of active pumps or a higher turnover rate per pump protein. The transmural gradient in [Na(+)](i) means physiological I(P) is approximately uniform across the ventricular wall, whereas transporters that utilize the transmembrane electrochemical gradient for Na(+), such as Na/Ca exchange, have a larger driving force in EPI than ENDO.

  8. Higiene e cuidados com a genitália de mulheres na menacme : estudo de base-populacional = Hygiene and genital care of menacme women : a population-based study

    OpenAIRE

    Virginia Pianessole Piassarolli

    2014-01-01

    Resumo: A higiene é o conjunto de cuidados corporais, do ambiente e de um modo de viver, de se vestir e de habitar para evitar doenças com o objetivo de conservar e fortificar a saúde. Em se tratando de saúde genital, a relação não poderia ser outra, uma vez que esta é parte integrante e inseparável da saúde geral do indivíduo. Estas ações são dependentes da condição social da população e previnem complicações e desconfortos, especialmente na área genital feminina, porém ainda não foram bem e...

  9. Utilização de biofertilizantes à base de aminoácidos na produção de mudas de Eucalyptus dunnii

    Directory of Open Access Journals (Sweden)

    Louíse Rickli de Souza

    2016-09-01

    Full Text Available A produção de mudas florestais em quantidade e qualidade é uma das fases mais importantes para o estabelecimento de povoamentos florestais mais uniformes e produtivos. A maior sobrevivência e desenvolvimento das plantas após o plantio é dependente, dentre outros fatores, de um bom estado nutricional das mudas. Este trabalho objetivou avaliar o potencial de utilização de dois biofertilizantes à base de aminoácidos como agentes promotores de crescimento inicial de mudas de Eucalyptus dunnii Maiden, denominados respectivamente como “BIO 1” e “BIO 2”. O experimento foi conduzido em viveiro comercial no município de Imbituva, PR. Foi utilizado delineamento inteiramente casualizado, com três tratamentos e 4 repetições, contendo 50 mudas por repetição. As variáveis avaliadas foram: altura da planta, diâmetro do coleto, peso de matéria fresca e seca da parte aérea e raízes, comprimento de raízes e índice de qualidade de Dickson. Houve respostas positivas pela aplicação dos biofertilizantes para todas as variáveis estudadas, destacando-se a aplicação do BIO 2.

  10. Prática educativa bem-sucedida na escola: reflexões com base em L. S. Vigotski e Baruch de Espinosa

    Directory of Open Access Journals (Sweden)

    ELIANA DE SOUSA ALENCAR MARQUES

    2017-01-01

    Full Text Available El texto reúne parte de los resultados de las investigaciones llevadas a cabo con el fin de investigar las mediaciones constitutivas de los profesores y estudiantes que desarrollan con éxito las prácticas educativas. El signifi - cado de la práctica educativa exitosa en la que nos basamos está anclado en las ideas de L. S. Vygotsky y Baruch Spinoza. Con base en los teóricos, entendemos prácticas educativas exitosas las que generan aprendizaje y desarrollo y permiten la expansión de afectos alegres que mejoran mentes y cuerpos humanos. La investigación tuvo lugar entre los años 2011 y 2014. Esto artículo presenta parte de los resultados alcanzados con los alumnos. Los resultados mostraron que, cuando alegres, las experiencias educativas convergen a la mayor potencia de ser un estudiante. El aumento de potencia reorienta la producción de nuevos sentidos que alteran significativamente la relación de estos con los estudios, con la escuela y con la vida.

  11. A bibliometria na exploração de bases de dados: a importância da Lingüística

    Directory of Open Access Journals (Sweden)

    Rogério Mugnaini

    Full Text Available A utilização das bases de dados para levantamento do estado da arte, procedimento necessário a qualquer pesquisador, exige dos mesmos a definição de estratégias para a recuperação eficaz da informação. A Bibliometria pode ser uma ferramenta útil neste processo, permitindo a filtragem de grandes quantidades de informação. Por se tratar de uma análise estatística de dados, a qualidade destes dados é de vital importância e o procedimento de indexação para representação da informação se torna essencial. Pretende-se aclarar a importância da Estatística, Lingüística e Indexação para a Ciência da Informação, focalizando alguns aspectos de suas relações e destacando a necessidade da utilização conjunta dessas disciplinas.

  12. Probability versus representativeness in infancy: can infants use naïve physics to adjust population base rates in probabilistic inference?

    Science.gov (United States)

    Denison, Stephanie; Trikutam, Pallavi; Xu, Fei

    2014-08-01

    A rich tradition in developmental psychology explores physical reasoning in infancy. However, no research to date has investigated whether infants can reason about physical objects that behave probabilistically, rather than deterministically. Physical events are often quite variable, in that similar-looking objects can be placed in similar contexts with different outcomes. Can infants rapidly acquire probabilistic physical knowledge, such as some leaves fall and some glasses break by simply observing the statistical regularity with which objects behave and apply that knowledge in subsequent reasoning? We taught 11-month-old infants physical constraints on objects and asked them to reason about the probability of different outcomes when objects were drawn from a large distribution. Infants could have reasoned either by using the perceptual similarity between the samples and larger distributions or by applying physical rules to adjust base rates and estimate the probabilities. Infants learned the physical constraints quickly and used them to estimate probabilities, rather than relying on similarity, a version of the representativeness heuristic. These results indicate that infants can rapidly and flexibly acquire physical knowledge about objects following very brief exposure and apply it in subsequent reasoning. PsycINFO Database Record (c) 2014 APA, all rights reserved.

  13. Development of Web based system for individual internal monitoring programme; Desenvolvimento de um sistema baseado na Web para suporte ao programa de monitoracao individual interna do IPEN

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Vanessa Rogeria de

    2007-07-01

    The purposes of the internal monitoring, in general, are to verify and document that each worker is protected adequately against risks from radionuclide intakes and the protection complies with legal requirements. Therefore, an overall radiation protection programme, starts with an assessment to identify work situations in which there is a risk of internal contamination of workers and to quantify the likely intake of radioactive material and the resulting committed effective dose. As a part of a continuous improvement of the monitoring programme for occupationally exposed workers at IPEN, it is being developed a Web based system to access the internal dosimetry database. The system was implemented using Hypertext Preprocessor, PHP, and a PostgreSQL database. This system will introduce a new paradigm in the routine of the internal dosimetry service, providing a fast access to the information among the measurement laboratories staff, dose evaluation group and the radiation protection supervisor. The database maintains information about worker identification, physical and chemical characteristics of the radionuclide, type of monitoring, measurement data and the dose. Moreover, this information will be readily available to provide support for regulatory compliance and quality control requirements. (author)

  14. Impact of HIV-1 reverse transcriptase polymorphism F214L on virological response to thymidine analogue based regimens in ART-naïve and experienced patients

    DEFF Research Database (Denmark)

    Silberstein, F; Cozzi-Lepri, A; Ruiz, L

    2007-01-01

    BACKGROUND: A negative association between the polymorphism F214L and type 1 thymidine analogue (TA) mutations (TAMs) has been observed. However, the virological response to TAs according to the detection of F214L has not been evaluated. METHODS: We studied 590 patients from EuroSIDA who started ...... were observed in patients with M41L/T215Y and mixed TAM profiles detected before the initiation of cART. CONCLUSIONS: This study provides evidence that the detection of polymorphism F214L is associated with a favorable virological response to TA-based cART.......BACKGROUND: A negative association between the polymorphism F214L and type 1 thymidine analogue (TA) mutations (TAMs) has been observed. However, the virological response to TAs according to the detection of F214L has not been evaluated. METHODS: We studied 590 patients from EuroSIDA who started TA...... therapy for the first time as part of potent combination antiretroviral therapy (cART) and who were tested for genotypic resistance within the past 6 months. End points were median reduction in the week 24 viral load and time to virological failure (2 consecutive VL measurements >400 copies/mL after...

  15. Lead free Bi0.5Na0.5TiO3 (BNT) and polyvinylidene fluoride (PVDF) based nanocomposite for energy storage applications

    Science.gov (United States)

    Pradhan, Lagen Kumar; Pandey, Rabichandra; Kumar, Sunil; Kar, Manoranjan

    2018-05-01

    Novel ceramic-polymer nanocomposites have great potential for electrical energy storage applications due to its high energy storage density. In the present work, BNT and PVDF based flexible polymer nanocomposites (BNT-PVDF) with different volume fraction (ϕ = 0, 5, 10, 15) were fabricated by solution casting method. Enhancement in beta phase of PVDF polymer matrix with the volume fraction (ϕ = 5, 10, 15) of BNT has been confirmed by X-ray diffraction (XRD) technique as well as Fourier transform infrared (FTIR) spectroscopy analysis. The enhancement of β phase increases as compared to (α) phases with volume fraction (ϕ) of nanofiller (BNT) in the matrix (PVDF) due to internal stress at the interface as well as structural modification of PVDF matrix. BNT-PVDF nanocomposites (with ϕ=10) showed a high dielectric constant (ɛr ≈ 78) relative to pure PVDF (ɛr ≈ 10) at 100 Hz. In addition to this, it exhibits relaxor type ferroelectric behavior with energy storage efficiency up to 77% for the volume fraction (ϕ) of 10.

  16. Mechanism of μ-conotoxin PIIIA binding to the voltage-gated Na+ channel NaV1.4.

    Directory of Open Access Journals (Sweden)

    Rong Chen

    Full Text Available Several subtypes of voltage-gated Na+ (NaV channels are important targets for pain management. μ-Conotoxins isolated from venoms of cone snails are potent and specific blockers of different NaV channel isoforms. The inhibitory effect of μ-conotoxins on NaV channels has been examined extensively, but the mechanism of toxin specificity has not been understood in detail. Here the known structure of μ-conotoxin PIIIA and a model of the skeletal muscle channel NaV1.4 are used to elucidate elements that contribute to the structural basis of μ-conotoxin binding and specificity. The model of NaV1.4 is constructed based on the crystal structure of the bacterial NaV channel, NaVAb. Six different binding modes, in which the side chain of each of the basic residues carried by the toxin protrudes into the selectivity filter of NaV1.4, are examined in atomic detail using molecular dynamics simulations with explicit solvent. The dissociation constants (Kd computed for two selected binding modes in which Lys9 or Arg14 from the toxin protrudes into the filter of the channel are within 2 fold; both values in close proximity to those determined from dose response data for the block of NaV currents. To explore the mechanism of PIIIA specificity, a double mutant of NaV1.4 mimicking NaV channels resistant to μ-conotoxins and tetrodotoxin is constructed and the binding of PIIIA to this mutant channel examined. The double mutation causes the affinity of PIIIA to reduce by two orders of magnitude.

  17. Produção científica sobre avaliação da visão em crianças: um estudo bibliométrico na base de dados LILACS

    Directory of Open Access Journals (Sweden)

    Maria Cristina Piumbato Innocentini Hayashi

    2012-03-01

    Full Text Available Este estudo teve por objetivo realizar análise bibliométrica da produção científica sobre avaliação da visão em crianças disponível na base de dados Lilacs. A metodologia da pesquisa observou os seguintes passos: revisão de literatura sobre avaliação da visão e bibliometria; coleta de dados na base de dados Lilacs; organização, tratamento bibliométrico e análise dos dados coletados utilizando o software MS Excel. Utilizando as expressões de busca “avaliação visual”, “avaliação da visão”, “avaliação funcional da visão”, “portadores de deficiência visual”, “baixa visão” e “transtornos da visão”, foram selecionados 27 artigos. Como resultados foram produzidos os seguintes indicadores: os idiomas predominantes das produções científicas foram o português e o espanhol; o artigo original escrito em coautoria é o tipo de publicação predominante, as temáticas mais abordadas foram: “baixa visão”, “acuidade visual”, “ambliopia” e “glaucoma”. Ficou constatado também que nem todos os autores trataram especificamente sobre avaliações da visão, sendo proposta também a avaliação cognitiva e da qualidade de vida de deficientes visuais. Torna-se recomendável a realização de novas pesquisas que demonstrem a importância da avaliação precoce da visão em crianças, visando que a intervenção, quando necessária, ocorra o mais cedo possível e previna os possíveis atrasos ocasionados pela deficiência visual. Deve-se também garantir que estes achados oftalmológicos se complementem com avaliações que caracterizem em quais situações os indivíduos que já possuem algum tipo de deficiência possam utilizar com maior eficácia sua visão. Palavras-chave: Baixa visão. Transtornos da visão. Bibliometria.

  18. A participação no processo decisório: um estudo na economia solidária Participation in the decision making process: a study in a solidarity-based economy association

    Directory of Open Access Journals (Sweden)

    Beatriz Centenaro Hellwig

    2007-12-01

    Full Text Available O presente artigo tem por objeto de estudo a participação e, por cenário, a Economia Popular e Solidária, essa forma de fazer econômico que tem por essência a valorização do trabalho sobre o capital, além das relações de trabalho ancoradas na autogestão, e que cultiva como princípio fundamental a solidariedade. Trata-se de uma pesquisa exploratória, baseada em estudo de caso único. A organização onde foi realizado o estudo é uma das treze associações responsáveis pela triagem de resíduos sólidos do Sistema Integrado de Resíduos Sólidos (GIRS, implantado pela Prefeitura Municipal de Porto Alegre em 1989, conforme o princípio da EPS. A análise dos dados revelou, entretanto, um modelo autocrático de gestão e baixo comprometimento dos associados, assim como o fato de que o trabalho é vivenciado como um meio de sobrevivência como outro qualquer. Já as relações entre os trabalhadores são pautadas pela desconfiança e pela competição, fatores que podem estar na origem das elevadas taxas de turnover e do baixo índice de produtividade constatados. Entre as conclusões deste estudo está o reconhecimento da complexidade de reconstruir o laço social.Participation in the decision making process was studied in the scenario of a solidarity-based economy association where work is valued above capital; work relations are anchored in self-management and solidarity is cultivated as a fundamental principle. Exploratory research was done in one of the thirteen associations responsible for solid waste salvage in the Integrated Solid Waste System implemented by the Porto Alegre City Hall in 1989 according to the solidarity-based economy principle. However analysis disclosed an autocratic model of management and limited commitment by associates. Work was considered to be a means of survival, no different from any other. Since relations among the workers are characterized by mistrust and competition, these may be the origin of the

  19. Reflexões sobre precoces, prodígios, gênios e as altas habilidades, com base na neurociência cognitiva

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Paulino

    2011-10-01

    Full Text Available Em Educação Especial, altas habilidades designam pessoas que demonstram capacidades, potenciais ou desempenho, em atividades humanas, bem acima da média. Objetivamos, utilizando-se da neurociência, entender os precoces, prodígios, gênios e altas habilidades como resultantes de um processo único das formações da memória. Trata-se de uma pesquisa bibliográfica, em que as obras foram identificadas, localizadas, compiladas, fichadas e analisadas. O material foi localizado a partir de palavras-chave em bases de dados. Para a compilação, foram utilizados, como critério de inclusão, a intersecção dos unitermos adotados, bem como os trabalhos de pesquisadores da educação, psicologia e neurociência, publicados entre 1966 e 2009. Analisamos qualitativamente 40 referências, sendo 18 artigos e 22 outros textos. A trajetória de análise foi desenvolvida tendo a questão norteadora: há necessidade de se explicar diferentemente os precoces, prodígios, gênios e as AH? Chegamos a três proposições lógicas. Procuramos demonstrar, por meio desse exercício lógico, que não haveria necessidade de se explicar diferentemente os precoces, prodígios, gênios e as AH, mas concluímos que há necessidade de tais diferenciações, mesmo dentro da área da neurociência, no entanto, a demonstração acima aponta para a teoria de Renzulli como válida para gênios e AH, com ressalvas para precoces e prodígios, que merecem um olhar mais aprofundado.Palavras-chave: Altas habilidades. Memória. Neurociência cognitiva. Neurotransmissores.

  20. NaKnowBase”: A Nanomaterials Relational Database

    Science.gov (United States)

    NaKnowBase is a relational database populated with data from peer-reviewed ORD nanomaterials research publications. The database focuses on papers describing the actions of nanomaterials in environmental or biological media including their interactions, transformations and poten...

  1. NaKnowBase”: A Nanomaterials Relational Database

    Science.gov (United States)

    NaKnowBase is an internal relational database populated with data from peer-reviewed ORD nanomaterials research publications. The database focuses on papers describing the actions of nanomaterials in environmental or biological media including their interactions, transformations...

  2. The NA27 trigger

    International Nuclear Information System (INIS)

    Bizzarri, R.; Di Capua, E.; Falciano, S.; Iori, M.; Marel, G.; Piredda, G.; Zanello, L.; Haupt, L.; Hellman, S.; Holmgren, S.O.; Johansson, K.E.

    1985-05-01

    We have designed and implemented a minimum bias trigger together with a fiducial volume trigger for the experiment NA27, performed at the CERN SPS. A total of more than 3 million bubble chamber pictures have been taken with a triggered cross section smaller than 75% of the total inelastic cross section. Events containing charm particles were triggered with an efficiency of 98 +2 sub(-3)%. With the fiducial volume trigger, the probability for a picture to contain an interaction in the visible hydrogen increased from 47.3% to 59.5%, reducing film cost and processing effort with about 20%. The improvement in data taking rate is shown to be negligible. (author)

  3. Na Cauda do Cometa

    Science.gov (United States)

    Voelzke, M. R.

    2009-01-01

    Quando viam um cometa, os antigos gregos imaginavam uma estrela com uma vasta cabeleira. Não à toa, a palavra deriva do termo koma, que significa cabelo. Constituídos por fragmentos de gelo e gases, os cometas possuem um núcleo sólido, que pode ter vários quilômetros de diâmetro, e uma cauda que sempre aponta na direção contrária ao Sol, devido aos ventos solares. Graças à aparência de pontos luminosos em movimento (ao contrário de outros astros, que parecem estáticos), esses corpos celestes foram interpretados por diferentes povos com muito misticismo, inspirando mitos tanto de boas-novas como de maus presságios. Conheça algumas dessas histórias:

  4. NA48 prototype calorimeter

    CERN Multimedia

    1990-01-01

    This is a calorimeter, a detector which measures the energy of particles. When in use, it is filled with liquid krypton at -152°C. Electrons and photons passing through interact with the krypton, creating a shower of charged particles which are collected on the copper ribbons. The ribbons are aligned to an accuracy of a tenth of a millimetre. The folding at each end allows them to be kept absolutely flat. Each shower of particles also creates a signal in scintillating material embedded in the support disks. These flashes of light are transmitted to electronics by the optical fibres along the side of the detector. They give the time at which the interaction occurred. The photo shows the calorimeter at NA48, a CERN experiment which is trying to understand the lack of anti-matter in the Universe today.

  5. A aprendizagem baseada em problemas na promoção da educação continuada com a equipe de enfermagem = The problem-based learning promoting the continuing education with the nursing team

    Directory of Open Access Journals (Sweden)

    Mileni Francisca Gomes Souza

    2011-07-01

    Full Text Available A educação para capacitar de maneira crítica e reflexiva a equipe de enfermagem no seu processo de trabalho motivou este estudo. O objetivo foi analisar a percepção dos profissionais de enfermagem sobre a viabilidade da utilização da aprendizagem baseada em problemas no contexto da educação continuada. Utilizou-se uma oficina sobre educação continuada com uma equipe de enfermagem, percorrendo a proposta metodológica do ‘Arco de Marguerez’, em que a realidade/problema foi a realização de uma técnica de curativo na unidade de saúde. Os dados foram obtidos com o auxílio de um roteiro semiestruturado, aplicado após a oficina, pelo método de grupo focal, em que os participantes com o auxílio do pesquisador expuseram suas percepções sobre a estratégia proposta. Os conteúdos dos diálogos foram gravados e posteriormente transcritos para análise de conteúdo. Os resultados sugerem repensar as estratégias na educação continuada para enfermagem, de maneira a proporcionar que cada profissional seja capaz de identificar os desafios na sua realidade a serem superados e contribuir para a mudança no âmbito pessoal e social. Infere-se a necessidade da constante atualização dos profissionais de enfermagem o que pode ser alcançado pela educação continuada com a equipe, em que a aprendizagem baseada em problemas mostrou-se satisfatória.The education to enable critically and reflectively the nursing team during work process motivated this study. The objective was to analyze the perception of nursing professionals on the feasibility of using problem-based learning in the context of continuing education. We used a workshop on continuing education with a nursing team, covering the methodological proposal of the ‘Arc of Marguerez’, where the reality/problem was to hold a healing technique in the health unit. Data was obtained with the aid of a semi-structured script, applied after the workshop, through the focus group method

  6. A ENGENHARIA NA ESCOLA

    Directory of Open Access Journals (Sweden)

    Valéria Pelizzer Casara

    2015-04-01

    Full Text Available Este projeto teve por objetivo principal mostrar às jovens do ensino médio, como as áreas de exatas e de engenharia podem estar inseridas em situações rotineiras por elas vivenciadas e incentivá-las para ingressarem nessas áreas. O projeto foi executado na escola de ensino Médio Nelson Horostecki na cidade de Chapecó, Santa Catarina. Mostrou-se de forma simples que as áreas de exatas e de engenharia têm aplicações práticas nas nossas vidas. No desenvolvimento do projeto, realizaram-se oficinas na escola cujo tema principal abordado foi o processo de fabricação do chocolate, visto que o mesmo é um produto muito apreciado pelas adolescentes. Dentro dessa temática, foram trabalhadas as questões que envolvem conhecimentos das áreas de exatas e de engenharia, mais especificamente a Engenharia Ambiental. O projeto auxiliou na formação cidadã e também na escolha profissional das meninas. Muitas das alunas participantes nunca haviam tido contato direto com alunos graduandos de cursos na área das exatas. Mais ainda, este projeto oportunizou a aproximação da universidade com a comunidade externa. Palavras-chave: Extensão Universitária, Ciências Exatas e Engenharia, Chocolate, Oficinas.   Engineering in the school Abstract: The main objective of this project was to show high school female students how the exact sciences and engineering can be included in their routine situations encouraging them to entering in these areas. The project was carried out at the Nelson Horostecki High School in Chapecó, Santa Catarina State, Brazil. It was showed in a simple manner how exact sciences and engineering have practical applications in our lives. Workshops were conducted in the school during the execution of the project in which the main subject was the chocolate manufacturing process, since chocolate is a product greatly appreciated by the young female people. Within this matter, the activities were performed using the knowledge of

  7. Enraizamento de estacas herbáceas de mirtilo: influência da lesão na base e do ácido indolbutírico Rooting of herbaceous blueberry cuttings: influence of the base incision and indolbutiric acid

    Directory of Open Access Journals (Sweden)

    Renato Trevisan

    2008-04-01

    Full Text Available O mirtilo (Vaccinium sp. é uma espécie de clima temperado que, por ocasião do período vegetativo, produz abundante quantidade de material vegetal que pode ser utilizado na propagação. Objetivou-se verificar o potencial de enraizamento de estacas herbáceas de diferentes cultivares de mirtilo, tratadas ou não com ácido indolbutírico e com e sem lesão na base. O trabalho foi realizado em dois experimentos, testando a capacidade de enraizamento das cultivares Florida, Woodard, Bluegem, Bluebele, Clímax e Briteblue. No primeiro experimento, as estacas das cultivares foram tratadas com AIB (0, 2500, 5000 e 7500mgL-1. No segundo experimento utilizou-se 2000mgL-1 de AIB, em estacas com e sem lesão na base. O delineamento utilizado foi completamente casualizado com repetições e unidades experimentais adequadas para cada experimento. O uso do ácido indolbutírico e a lesão nas estacas, não proporcionaram estímulo na emissão de raízes adventícias; as cultivares apresentam potencial genético de enraizamento diferenciado, sendo que, a Bluebelle apresentou maiores porcentuais de estacas enraizadas, e a Clímax, os menores porcentuais.Blueberries (Vaccinium sp. are species of temperate climate that, for occasion of the vegetative period, produce large amount of vegetal material that can be used in the propagation. This way, with the aim of verifying the rooting potential of different herbaceous cuttings of blueberry cultivars, with the use or not of indolbutíric acid and base injury. The work was carried out in two experiments, having tested the capacity of rooting of the following cultivars Florida, Woodard, Bluegem, Bluebele, Clímax and Briteblue. In the first experiment, cuttings of cultivars were treated with IBA (0, 2500, 5000 and 7500mg.L-1. On the second experiment one used 2000mg.L-1 of AIB, in cuttings with and without injury in the base. The experimental design was the completely randomized with adjusted repetitions and

  8. Programa de Saúde da Família: uma avaliação de efetividade com base na percepção de usuários Family Health Program: effectiveness assessment based on user perception

    Directory of Open Access Journals (Sweden)

    Ana Katarina Pessoa de Oliveira

    2008-04-01

    Full Text Available Este artigo apresenta os resultados de uma pesquisa que relaciona a percepção dos usuários sobre a contribuição do Programa de Saúde da Família (PSF, na Unidade Mista de Felipe Camarão, Distrito Oeste de Natal, Rio Grande do Norte, com a evolução dos indicadores de atenção à saúde da criança menor de cinco anos, no período de 2000 a 2004. Inicialmente foi realizado um levantamento de dados sobre a política de saúde implementada, incluindo um perfil dos usuários envolvidos. Depois, uma consulta às estatísticas disponíveis, contidas em documentos oficiais do Ministério da Saúde e da Secretaria Municipal de Saúde de Natal, referentes às ações desenvolvidas na área da saúde da criança no período considerado. Por fim, aplicou-se um questionário de pesquisa social a uma amostra de famílias com crianças menores de cinco anos, cadastradas na unidade mista, para conhecer o seu grau de satisfação com os serviços recebidos. A comparação do nível de satisfação dos usuários com a evolução das estatísticas revelou que as ações de atenção à saúde da criança do PSF, no órgão público considerado, foram transformadoras de atitudes e propulsoras de mudanças sociais.This article presents the results of a study to identify in what extent user perception of the contribution of the Family Health Program (Programa de Saúde da Família, PSF, at the Felipe Camarão Unit, in the West District of Natal (state of Rio Grande do Norte, Brazil reflects the evolution of the healthcare indicators for children under five, in the period between 2000 and 2004. Initially data on the implemented health policy was gathered, including a profile of the users involved. Then the available statistics related to the child healthcare measures carried out during that period were obtained from official documents of the federal and municipal Health Department. Finally a social survey questionnaire was applied to a sample of families

  9. Na-Si binary phase diagram and solution growth of silicon crystals

    International Nuclear Information System (INIS)

    Morito, H.; Yamada, T.; Ikeda, T.; Yamane, H.

    2009-01-01

    In the present study, a Na-Si binary phase diagram was first presented from the results of differential thermal analysis and X-ray diffraction. Based on the phase diagram, we performed low-temperature formation of single crystals, film and porous bulk of Si by vaporizing Na from a Na-Si melt at 800 or 900 deg. C.

  10. Characterization and comprehension of zeolite NaY/mesoporous SBA-15 composite as adsorbent for paraquat

    Energy Technology Data Exchange (ETDEWEB)

    Osakoo, Nattawut, E-mail: natawut.work@gmail.com [School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000 (Thailand); Pansakdanon, Chaianun [School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000 (Thailand); Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190 (Thailand); Sosa, Narongrit; Deekamwong, Krittanun; Keawkumay, Chalermpan; Rongchapo, Wina [School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000 (Thailand); Chanlek, Narong [Synchrotron Light Research Institute, Nakhon Ratchasima, 30000 (Thailand); Jitcharoen, Juthamas [Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190 (Thailand); Prayoonpokarach, Sanchai [School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000 (Thailand); Wittayakun, Jatuporn, E-mail: jatuporn@g.sut.ac.th [School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000 (Thailand)

    2017-06-01

    NaY was synthesized from fumed silica and further modified to form a composite with SBA-15. Textural properties and basicity of the composite NaY-SBA-15 were between those of the parent materials. Paraquat adsorption on NaY was 204.1 mg/g, higher than that on NaY synthesized with rice husk silica from the previous work. SBA-15 was a poor adsorbent for paraquat. Based on the weight of NaY, the adsorption capacity of analytical-grade paraquat on the NaY-SBA-15 composite was 241.5 mg/g-NaY. Moreover, the composite adsorbed blue dye from a commercial grade paraquat. Interaction between the NaY-SBA-15 and paraquat could be from C and N atoms in paraquat with oxygen atom on NaY-SBA-15. - Highlights: • Zeolite NaY/mesoporous SBA-15 composite was synthesized with a simple method. • NaY and SBA-15 coexisted in the composite confirmed by FTIR, CO{sub 2}-TPD and XPS. • Adsorption capacity of paraquat (mg/g-NaY) was improved by NaY and SBA-15 composite. • C and N atoms in paraquat could interact with oxygen atom on NaY-SBA-15 composite.

  11. Investigation on U - O - Na, Pu - O - Na and U,Pu - O - Na phase diagrams

    International Nuclear Information System (INIS)

    Pillon, S.

    1989-03-01

    The thermochemical interaction between the nuclear fuel (uranium and plutonium mixed oxides) and the sodium has been investigated and particularly the three phase diagrams: U - O - Na; Pu - O - Na; U,Pu - O - Na. High temperature neutron diffraction, microcalorimetry and powder X-ray diffraction were used for the characterization of the compounds synthetized. This study allowed to complete the knowledge about each of these diagrams and to measure some physical and thermal properties on the compounds. The limits on the modelization of the fuel-sodium interaction are discussed from the results of the UO 2 - Na reaction [fr

  12. The New Readout System of the NA62 LKr Calorimeter

    CERN Document Server

    Ceccucci, A; Farthouat, P; Lamanna, G; Rouet, J; Ryjov, V; Venditti, S

    2015-01-01

    The NA62 experiment [1] at CERN SPS (Super Proton Synchrotron) accelerator aims at studying Kaon decays with high precision. The high resolution Liquid Krypton (LKr) calorimeter, built for the NA48 [2] experiment, is a crucial part of the photon-veto system; to cope with the demanding NA62 re- quirements,itsback-endelectron icshadtobecompletelyrenewed. The new readout system is based on the Calorimeter REAdout Module (CREAM) [3], a 6U VME board whose design and pro- duction was sub-contracted to CAEN [4], with CERN NA62 group continuously supervising the de velopment and production phase. The first version of the board was delivered by the manufacturer in March 2013 and, as of June 2014, the full board production is ongoing. In addition to describing the CREAM board, all aspects of the new LKr readout system, including its integration within the NA62 TDAQ scheme, will be treated.

  13. Određivanje pada početne brzine projektila na osnovu mere produženja barutne komore / Calculation of muzzle velocity loss based on propellant chamber elongation

    Directory of Open Access Journals (Sweden)

    Slobodan Ilić

    2002-05-01

    Full Text Available U radu je prikazan postupak za proračun pada početne brzine projektila na osnovu mere produženja barutne komore. Proračuni su urađeni za artiljerijska oruđa koja koriste dvodelni metak. Za poznate unutrašnjobalističke metode Drozdova i Opokova modifikovano je programsko rešenje i prilagođeno rešavanju navedenog problema. Dobijeni rezultati su upoređeni sa spoljnobalističkim tablicama i remontnom dokumentacijom. / A method for calculation the loss of muzzle velocity is presented. The model is based on an erosion of the origin of rifling (elongation of propellant chamber and the known models of interior ballistics of Opokov and Drozdov. First, a computer version of these models is modified. The calculations are made for howitzers using a two-part cartridge. The numerical model has been applied to repair documents and ballistic tables.

  14. Abordagens da produção científica em administração publicada na base Scopus à luz da teoria institucional, de 2000 a 2013

    Directory of Open Access Journals (Sweden)

    Sabrina do Nascimento

    2014-08-01

    Full Text Available O presente artigo teve como objetivo analisar a produção científica sobre Teoria Institucional indexada na base de dados Scopus voltada para a área de Administração, no período de 2000 a 2013. Evidenciou-se que: o autor mais prolífico sobre a temática da Teoria Institucional é Currie, G.; as universidades com maior publicação foram a University of Alberta e University of Nottingham. No cenário nacional, duas revistas aparecem, a RAE – Revista de Administração de Empresas e a Revista de Administração pública; já no cenário internacional, as revistas que possuem maior destaque são a Human Relations, o Journal of Business Ethics, o Business Strategy and the Environment e Critical Perspectives on Accounting. A área do conhecimento que aborda a Teoria Institucional é predominante nas ciências sociais e corresponde a 40,4% do total.

  15. Variabilidade genética de búfalos em rebanho-núcleo com base na análise de pedigree Genetic variability in water buffalo from nucleous herd by pedigree analysis

    Directory of Open Access Journals (Sweden)

    C.R. Marcondes

    2010-06-01

    Full Text Available Parâmetros baseados na probabilidade de origem do gene foram usados para descrever a variabilidade em uma população de búfalos da Embrapa Amazônia Oriental. A magnitude dos resultados foi de média a baixa (por volta de 20 animais, sugerindo que poucos fundadores contribuiriam para a formação da população. Dentre os 20 ancestrais que mais aportam genes aos machos - representando ao todo 71% dos alelos -, 39%, 26% e 5%, respectivamente, são as contribuições marginais das raças Murrah e Mediterrâneo e seus mestiços. Para as fêmeas, em que os 20 ancestrais aportam 67,5% dos genes, 42% e 26%, respectivamente, são as contribuições marginais das raças Murrah e Mediterrâneo.Parameters based on the probability of gene origin were used to describe genetic variability in a buffalo population from the Embrapa Amazônia Oriental, Belém, Pará, Brazil. The parameters generated medium to low values (around 20 animals and suggested low founder representativeness. From the 20 ancestors that gave more genes to males (with 71% of alleles, genetic contributions were 39%, 26%, and 5%, respectively, for Murrah, Mediterraneo, and crossbreds. For females, these values were 42% and 26% for Murrah and Mediterraneo breeds.

  16. In-Situ Electrochemical Corrosion Behavior of Nickel-Base 718 Alloy Under Various CO2 Partial Pressures at 150 and 205 °C in NaCl Solution

    Science.gov (United States)

    Zhang, Yubi; Zhao, Yongtao; Tang, An; Yang, Wenjie; Li, Enzuo

    2018-03-01

    The electrochemical corrosion behavior of nickel-base alloy 718 was investigated using electrochemical impedance spectroscopy and potentiodynamic polarization techniques at various partial pressures of CO2 (P_{{{CO}2 }} s) in a 25 wt% NaCl solution at 150 and 205 °C. The passive films composed of FeCO3 exhibit good corrosion resistance with a feature of Warburg impedance, Tafel plots show a complete passivation and the anodic reactions was dominated by a diffusion process at low P_{{{CO}2 }} s (1.8-9.8 MPa) at 150 °C. While numerous dented corrosion areas appeared on the sample surface for the P_{{{CO}2 }} of 11.6 MPa at 205 °C, the Tafel plot with three anodic peaks and the Nyquist diagram with an atrophied impedance arc were present. This dented corrosion attribute to the synergistic effects of stress, temperature, P_{{{CO}2 }} and Cl-, the temperature and stress could play crucial roles on the corrosion of the alloy 718.

  17. Accessing the band alignment in high efficiency Cu(In,Ga)(Se,S)2 (CIGSSe) solar cells with an InxSy:Na buffer based on temperature dependent measurements and simulations

    Science.gov (United States)

    Schoneberg, Johannes; Ohland, Jörg; Eraerds, Patrick; Dalibor, Thomas; Parisi, Jürgen; Richter, Michael

    2018-04-01

    We present a one-dimensional simulation model for high efficiency Cu(In,Ga)(Se,S)2 solar cells with a novel band alignment at the hetero-junction. The simulation study is based on new findings about the doping concentration of the InxSy:Na buffer and i-ZnO layers as well as comprehensive solar cell characterization by means of capacitance, current voltage, and external quantum efficiency measurements. The simulation results show good agreement with the experimental data over a broad temperature range, suggesting the simulation model with an interface-near region (INR) of approximately 100 nm around the buffer/absorber interface that is of great importance for the solar cell performance. The INR exhibits an inhomogeneous doping and defect density profile as well as interface traps at the i-layer/buffer and buffer/absorber interfaces. These crucial parameters could be accessed via their opposing behavior on the simulative reconstruction of different measurement characteristics. In this work, we emphasize the necessity to reconstruct the results of a set of experimental methods by means of simulation to find the most appropriate model for the solar cell. Lowly doped buffer and intrinsic window layers in combination with a high space charge at the front of the absorber lead to a novel band alignment in the simulated band structure of the solar cell. The presented insights may guide the strategy of further solar cell optimization including (alkali-) post deposition treatments.

  18. Solubility of NaNd(CO3)2.6H2O(c) in concentrated Na2CO3 and NaHCO3 solutions

    International Nuclear Information System (INIS)

    Rao, L.; Rai, D.; Felmy, A.R.; Fulton, R.W.; Novak, C.F.

    1996-01-01

    NaNd(CO 3 ) 2 x 6 H 2 O(c) was identified to be the final equilibrium solid phase in suspensions containing concentrated sodium carbonate (0.1 to 2.0 M) and sodium bicarbonate (0.1 to 1.0 M), with either NaNd(CO 3 ) 2 x 6 H 2 O(c) or Nd 2 (CO 3 ) 3 x xH 2 O(s) as initial solids. A thermodynamic model, based on Pitzer's specific into-interaction approach, was developed to interpret the solubility of NaNd(CO 3 ) 2 x 6 H 2 O(c) as functions of sodium carbonate and sodium bicarbonate concentrations. In this model, the solubility data of NaNd(CO 3 ) 2 x 6 H 2 O(c) were explained by assuming the formation of NdCO 3 + , Nd(CO 3 ) 2 - and Nd(CO 3 ) 3 3- species and invoking the specific ion interactions between Na + and Nd(CO 3 ) 3 3- . Ion interaction parameters for Na + -Nd(CO 3 ) 3 3- were developed to fit the solubility data. Based on the model calculations, Nd(CO 3 ) 3 3- was the predominant aqueous neodymium species in 0.1 to 2 M sodium carbonate and 0.1 to 1 M sodium bicarbonate solutions. The logarithm of the NaNd(CO 3 ) 2 x 6 H 2 O solubility product (NaNd(CO 3 ) 2 x 6 H 2 O(c)=Na + +Nd 3+ +2 CO 3 2- +6 H 2 O) was calculated to be -21.39. This model also provided satisfactory interpretation of the solubility data of the analogous Am(III) system in less concentrated carbonate and bicarbonate solutions. (orig.)

  19. Assessment of Impact of the Rheological Parameters Change on Sensitivity of the Asphalt Strain Based on the Test Results / Ocena Wpływu Zmiany Parametrów Reologicznych Na Wrażliwość Deformacji Mieszanek Mineralno - Asfaltowych Na Podstawie Wyników Badań

    Directory of Open Access Journals (Sweden)

    Kurpiel Artur

    2015-03-01

    Full Text Available Badanie pełzania pod obciążeniem statycznym jest obecnie najbardziej efektywnym badaniem pozwalającym na określenie reologicznych parametrów mieszanek mineralno - asfaltowych na podstawie krzywej pełzania. Stosowane obciążenia mają poziom nieniszczący i pozwalają na obserwację przebiegu odkształceń w czasie również po odciążeniu. Badanie może być realizowane przy ściskaniu, ścinaniu, rozciąganiu i zginaniu, a także w zakresie trójosiowym, w zależności od stosowanego aparatu realizującego zadany schemat naprężeń [1, 2, 3, 4, 5, 6].

  20. Mineralogical, Geochemical and Isotopic Characterisation of the Travertine Formation Associated with the Alicun de las Torres Thermal System (Province of Granada): Palaeoclimatic and Palaeoenvironmental Implications.; Caracterizacion Mineralogica, Geoquimica e Isotopica de los Travertinos Asociados al Sistema Termal de Alicun de las Torres (Provincia de Granada): Implicaciones Paleoclimaticas y Paleoambientales

    Energy Technology Data Exchange (ETDEWEB)

    Prado, A. J.; Delgado, A.; Crespo, M. T.; Martin, A.; Perez del Villar, L.

    2010-12-24

    In the framework of a Singular Strategic Project entitled: Advanced Technologies of Carbon, Capture and Storage (CCS), supported by the MICINN (Spain) and the FEDER founds (EU), specifically in the Carbon Storage Task, a comprehensive study on the CO{sub 2} leakage as DIC (Dissolved Inorganic Carbon) in the Alicun de Las Torres (Prov. of Granada) natural analogue Thermal System was envisaged. This analogous system is characterised by the presence of a very important travertine formation. In order to explain the formation of these travertine mass a detailed mineralogical, petrographic, geochemical and isotopic, including stable and radioactive isotopes, characterisation has been carried out. Based on these data, paleoclimatic and palaeoenvironmental conditions under which this travertine formation was formed, during a period of approximately 230Ky, have also been deduced. (Author) 234 refs.

  1. Transepithelial Na+ transport and the intracellular fluids: a computer study.

    Science.gov (United States)

    Civan, M M; Bookman, R J

    1982-01-01

    Computer simulations of tight epithelia under three experimental conditions have been carried out, using the rheogenic nonlinear model of Lew, Ferreira and Moura (Proc. Roy. Soc. London. B 206:53-83, 1979) based largely on the formulation of Koefoed-Johnsen and Ussing (Acta Physiol. Scand. 42: 298-308. 1958). First, analysis of the transition between the short-circuited and open-circuited states has indicated that (i) apical Cl- permeability is a critical parameter requiring experimental definition in order to analyze cell volume regulation, and (ii) contrary to certain experimental reports, intracellular Na+ concentration (ccNa) is expected to be a strong function of transepithelial clamping voltage. Second, analysis of the effects of lowering serosal K+ concentration (csK) indicates that the basic model cannot simulate several well-documented observations; these defects can be overcome, at least qualitatively, by modifying the model to take account of the negative feedback interaction likely to exist between the apical Na+ permeability and ccNa. Third, analysis of the strongly supports the concept that osmotically induced permeability changes in the apical intercellular junctions play a physiological role in conserving the body's stores of NaCl. The analyses also demonstrate that the importance of Na+ entry across the basolateral membrane is strongly dependent upon transepithelial potential, cmNa and csK; under certain conditions, net Na+ entry could be appreciably greater across the basolateral than across the apical membrane.

  2. Valores na escola

    Directory of Open Access Journals (Sweden)

    Menin Maria Suzana De Stefano

    2002-01-01

    Full Text Available Neste texto pretende-se discorrer sobre valores morais na escola e suas implicações para a formação de professores. Para tanto discutir-se-á, em primeiro lugar, e brevemente, o que são valores morais, ou éticos, e como a escola pode situar-se em relação a eles. Em seguida, serão relatadas algumas observações a respeito de valores de professores e práticas daí decorrentes. São comentados resultados de pesquisa que ilustram a transmissão de valores de forma doutrinal e a educação moral e cívica tal como realizada na ditadura militar, e, por outro lado, a posição relativista e/ou de laissez-faire que certas escolas podem adotar, metodologicamente, sobre a educação em valores. Finalmente, defender-se-á a idéia de que é necessária uma discussão sobre valores pelos diversos membros da escola e uma opção por uma metodologia para ensiná-los, seja os professores, em sua formação inicial e continuada, seja os alunos. A teoria de desenvolvimento moral de Jean Piaget será apresentada como uma referência possível para a educação em valores. Exemplos de situações escolares de conflito de valores entre direção, pais e alunos são discutidas para ilustrar como uma escola pode adotar um procedimento democrático de educação em valores, que se apresenta como um terceiro caminho possível de educação moral nas escolas, além das posições doutrinárias ou relativistas.

  3. Fabrication and evaluation of chitosan/NaYF{sub 4}:Yb{sup 3+}/Tm{sup 3+} upconversion nanoparticles composite beads based on the gelling of Pickering emulsion droplets

    Energy Technology Data Exchange (ETDEWEB)

    Yan, Huiqiong; Chen, Xiuqiong; Shi, Jia; Shi, Zaifeng; Sun, Wei; Lin, Qiang, E-mail: linqianggroup@163.com; Wang, Xianghui; Dai, Zihao

    2017-02-01

    The rare earth ion doped upconversion nanoparticles (UCNPs) synthesized by hydrophobic organic ligands possess poor solubility and low fluorescence quantum yield in aqueous media. To conquer this issue, NaYF{sub 4}:Yb{sup 3+}/Tm{sup 3+} UCNPs, synthesized by a hydrothermal method, were coated with F127 and then assembled with chitosan to fabricate the chitosan/NaYF{sub 4}:Yb{sup 3+}/Tm{sup 3+} composite beads (CS/NaYF{sub 4}:Yb{sup 3+}/Tm{sup 3+} CBs) by Pickering emulsion system. The characterization results revealed that the as-synthesized NaYF{sub 4}:Yb{sup 3+}/Tm{sup 3+} UCNPs with an average size of 20 nm exhibited spherical morphology, high crystallinity and characteristic emission upconversion fluorescence with an overall blue color output. The NaYF{sub 4}:Yb{sup 3+}/Tm{sup 3+} UCNPs were successfully conjugated on the surface of chitosan beads by the gelling of emulsion droplets. The resultant CS/NaYF{sub 4}:Yb{sup 3+}/Tm{sup 3+} CBs showed good upconversion luminescent property, drug-loading capacity, release performance and excellent biocompatibility, exhibiting great potentials in targeted drug delivery and tissue engineering with potential tracking capability and lasting release performance. - Highlights: • NaYF{sub 4}:Yb{sup 3+}/Tm{sup 3+} UCNPs were coated by F127 to improve aqueous dispersibility. • NaYF{sub 4}:Yb{sup 3+}/Tm{sup 3+} UCNPs were assembled with chitosan to fabricate the composite beads (CMs). • Pickering emulsions stabilized by UCNPs exhibited uniform and satisfactory emulsion droplets. • The CMs prepared by the gelling of emulsion droplet preserved upconversion luminescent property. • The resultant CMs showed good drug-loading capacity, release performance and biocompatibility.

  4. Análises da precipitação pluvial no Estado da Paraíba com base na teoria da entropia Use of entropy theory in analysis of rainfall and air temperature

    Directory of Open Access Journals (Sweden)

    Vicente de P. R. da Silva

    2003-08-01

    Full Text Available Os dados diários de precipitação pluvial de 58 postos pluviométricos do Estado da Paraíba e de temperatura média diária de Campina Grande, PB, foram utilizados para avaliar a variabilidade espacial e temporal da precipitação pluvial, com base na teoria da entropia. Analisou-se, também, a variabilidade temporal da temperatura do ar em Campina Grande, com base nessa mesma teoria. Os resultados evidenciaram que a entropia é alta em locais com intensa precipitação, e baixa quando ocorrem, nesses locais, baixos índices pluviométricos; conseqüentemente, nos períodos chuvosos a entropia é alta e, nos períodos de estiagem, é mínima. Este trabalho evidencia, ainda, que qualquer série temporal de entropia decresce exponencialmente com o aumento do seu desvio-padrão.The objective of this study was the evaluation of the rainfall variability in Paraíba state. Daily rainfall observed from a network of 58 rain gauges in Paraíba State and mean daily temperature observed at Campina Grande weather station were analyzed using entropy theory. The results showed that rainfall entropy is high in localities and periods with high rainfall values and is low in localities and periods with low rainfall values. Maximum values of rainfall entropy occurred in the rainy period and minimum values occurred in the dry period. However, the entropy of the temperature time serie was constant, with maximum value of 8.53 bits. This study shows that for any time series the entropy decreases exponentially with increase of standard deviation.

  5. Reclassification of Candida guilliermondii FTI 20037 as Candida tropicalis based on molecular phylogenetic analysis Reclassificação de Candida guilliermondii FTI 20037 como Candida tropicalis baseada na análise filogenética molecular

    Directory of Open Access Journals (Sweden)

    Luanne Helena Augusto Lima

    2003-11-01

    Full Text Available Yeasts of the genus Candida are of clinical importance and also have many industrial applications, mainly in the food industry. The yeast Candida guilliermondii FTI 20037 has been extensively studied in order to establish a biotechnological process for the production of xylitol. The goal of this study was to verify the taxonomic classification of this strain based on the analysis of rDNA sequences and the xyl1 gene. DNA fragments from these sequences were amplified by PCR and BLAST analysis revealed strong identity with the corresponding sequences from Candida tropicalis. Based on these results, we propose that C. guilliermondii FTI 20037 must be reclassified as C. tropicalis.As leveduras do gênero Candida possuem tanto importância clínica como diversas aplicações industriais, principalmente na indústria de alimentos. A levedura Candida guilliermondii FTI 20037 tem sido exaustivamente estudada pois pretende-se utilizá-la no estabelecimento de um processo biotecnológico para a produção de xilitol. O objetivo deste trabalho foi verificar a classificação taxonômica desta levedura por análise de sequências do rDNA e do gene xyl1. Fragmentos correspondentes a estas regiões foram amplificados por PCR e a análise destas sequências por BLAST revelou alta identidade com sequências correspondentes de Candida tropicalis. Estes resultados nos levam a propor que C. guilliermondii FTI 20037 deva ser reclassificada como C. tropicalis.

  6. Recovery of the heavy elements by NaY AND NaZSM-5 sorbant materials

    International Nuclear Information System (INIS)

    Nibou, D.; Lebail, S.

    1997-04-01

    Porous sorbants as zeolites have a several applications in differents fiels: industrial gas purification, catalysis, transformation hydrocarbures prosesses and exchange ions. The hiogh capacity to exchange their cations with those of aqueous solutions was known (1). Since the accession of synthetic zeolites, these silicates have invaded the market and the firstindustrial applications were in exchange field. Studies at Battelle Northwest in Rchland, Washington have shown that zeolites may be used in treatment of radioactive wastes (2). The used method for storing the isotopes is based on selective removal by ion exchange. Clinoptilolite, zeolite (modernite), NaA, and AW-500 have been used. In this context, the present work deals with the recovery of heavy metals like lead and uranium using some microporous materials. The obtained results show that NaY faujasite and NaZSM-5 of the FAU- and MFI-type structure respectively are very effective in removing these elements from waste water

  7. A aposta na filosofia

    Directory of Open Access Journals (Sweden)

    Márcio Suzuki

    2011-12-01

    Full Text Available Para Hume, filosofar é uma atividade semelhante às demais ocupações humanas. A decisão que leva à atividade filosófica é menos resultado de uma argumentação teórica do que fruto de um cálculo prático, que é entendido como uma caça ou um jogo. O objetivo deste trabalho será o de mostrar que no jogo filosófico perde quem joga sério demais. A aposta na filosofia tem que passar pelo bom humor e pela diversão: uma resposta a Pascal?For Hume, philosophy is in itself neither more nor less important than other human activities. On the contrary, it can be explained from its resemblance with game and hunting. If one chooses to dedicate himself to philosophy, his decision is not the consequence of logical reasoning, but depends on practical evaluation, which has something to do with gambling. The following text tries to show that in philosophy, like in other games, the loser will be the one who plays too earnestly. The philosophical game requires good humour and some relaxation: Is this a good answer to Pascal's pari?

  8. Modelo multidimensional para o controle da dengue: uma proposta com base na reprodução social e situações de riscos Multidimensional model for dengue control: a proposal based on social reproduction and risk situations

    Directory of Open Access Journals (Sweden)

    Solange Laurentino dos Santos

    2011-01-01

    Full Text Available O objetivo do artigo consiste em apresentar e discutir um modelo compreensivo/explicativo, de caráter ecossistêmico, sobre o processo de transmissão da dengue nos níveis de micro e macrocontexto, a partir da identificação das situações de riscos envolvidas. Considerou-se a dengue como doença infecciosa viral de transmissão vetorial que traz, na sua dinâmica de transmissão, elementos das dimensões biológicas, de conduta, ecológicas, políticas e econômicas, o que a caracteriza como um problema complexo e exige um enfoque sistêmico para seu controle. Assim, para a construção da modelagem, utilizaram-se o enfoque teórico da reprodução social de Juan Samaja e seus condicionantes de macro e microcontexto, e o enfoque operativo ecossistêmico, que buscou responder à pergunta condutora desta construção: quais são as situações de risco para transmissão da dengue, considerando as diversas dimensões da "reprodução social da saúde" no nível local? A visão ampliada das inter-relações entre as diversas situações de risco envolvidas na determinação multidimensional da dengue poderá servir como eixo direcionador para uma gestão integrada das ações do programa de controle da doença, articuladas entre os diversos setores envolvidos.This paper aims to present and discuss a comprehensive / explanatory model, of ecosystem approach, on the process of transmission of dengue in the levels of micro and macro context, from the identification of the risks involved. Dengue was considered a viral infectious disease of vectorial transmission that carries on its transmission dynamics, elements of the biological, behavioral, ecological, political and economic dimensions, that make it a complex problem and require a systemic approach to its control. Thus, for the construction of modeling, we used the theoretical framework of social reproduction of Juan Samaja and its conditions of macro and micro-context, and the operating

  9. Fluorine-18 NaF PET imaging of child abuse

    Energy Technology Data Exchange (ETDEWEB)

    Drubach, Laura A. [Children' s Hospital Boston and Harvard Medical School, Department of Radiology, Division of Nuclear Medicine/PET, Boston, MA (United States); Sapp, Mark.V. [School of Osteopathic Medicine, Child Abuse Research Education and Services (CARES) Institute University of Medicine and Dentistry of New Jersey, New Jersey (United States); Laffin, Stephen [Children' s Hospital Boston, Department of Radiology, Division of Nuclear Medicine/PET, Boston, MA (United States); Kleinman, Paul K. [Children' s Hospital Boston and Harvard Medical School, Department of Radiology, Division of Musculoskeletal Imaging, Boston, MA (United States)

    2008-07-15

    We describe the use of {sup 18}F-NaF positron emission tomography (PET) whole-body imaging for the evaluation of skeletal trauma in a case of suspected child abuse. To our knowledge, 18F NaF PET has not been used in the past for the evaluation of child abuse. In our patient, this technique detected all sites of trauma shown by initial and follow-up skeletal surveys, including bilateral metaphyseal fractures of the proximal humeri. Fluorine-18 NaF PET has potential advantage over Tc-99m-labeled methylene diphosphonate (MDP) based upon superior image contrast and spatial resolution. (orig.)

  10. Fluorine-18 NaF PET imaging of child abuse

    International Nuclear Information System (INIS)

    Drubach, Laura A.; Sapp, Mark V.; Laffin, Stephen; Kleinman, Paul K.

    2008-01-01

    We describe the use of 18 F-NaF positron emission tomography (PET) whole-body imaging for the evaluation of skeletal trauma in a case of suspected child abuse. To our knowledge, 18F NaF PET has not been used in the past for the evaluation of child abuse. In our patient, this technique detected all sites of trauma shown by initial and follow-up skeletal surveys, including bilateral metaphyseal fractures of the proximal humeri. Fluorine-18 NaF PET has potential advantage over Tc-99m-labeled methylene diphosphonate (MDP) based upon superior image contrast and spatial resolution. (orig.)

  11. Microscopía electrónica para el estudio del Na2Si0(4 en la durabilidad de un compuesto a base de cemento portlánd y refuerzo de caoba Analysis of Na2Si0(4 effect on durability of a portlánd cement matrix and mahogany reinforcement composite through electron microscopy

    Directory of Open Access Journals (Sweden)

    Inocente Bojórque

    2007-12-01

    Full Text Available Con la ayuda de la microscopía electrónica, se logra apreciar el trabajo desarrollado por el silicato de sodio como agente mineraüzador de las fibras orgánicas en compuestos polifásicos con matriz de cemento Portland Tipo I. El objetivo de este trabajo fue el estudio de la acción del agente en la durabilidad del material, debido a la incompatibilidad química entre el hidróxido de calcio Ca(OH2 y el refuerzo a base de fibras procedentes de la caoba (Swietenia Macrophylla, en compuestos con características semejantes pero de tres diferentes edades y en compuestos de la misma edad pero elaborados con dos diferentes fracciones volumétricas del ingrediente orgánico. Los ensayos se realizaron en tres diferentes zonas: matriz, refuerzo y transición, empleando un Microscopio Electrónico de Barrido (MEB mientras que la composición química se hizo con un Analizador de Rayos "X" (EDS; a través del primer equipo se observó el contraste entre las diversas fases del compuesto por la diferencia entre los números atómicos; con el segundo, se analizó la composición química de las zonas de interés. Los resultados mostraron las bondades del agente en la durabilidad del material y, los beneficios del uso de la microscopía electrónica para visualizar el comportamiento microestructuralNa2Si0(4 behavior as a mineralizer agent on organic fibers composites with Type I Portland Cement matrix is possible to observe it through a Scanning Electron Microscope (SEM. The purpose of this research was to study the role of this agent on this material's durability due to the chemical incompatibility between calcium hydroxide Ca(OH2 and the fiber reinforcement from the mahogany (Swietenia Macrophylla, from composites of three different ages and two different fiber volumetric fraction as well. The tests were made in three different zones: matrix, reinforcement and transition zone, using a SEM, whereas the chemical composition was scanned out with an Energy

  12. VPLIV OSEBNOSTI NA STILE VODENJA

    OpenAIRE

    Vučak, Petra

    2009-01-01

    Nekatere naše vrline krasijo zlate lastnosti, druge pa kvarijo sivi odtenki. Če bi ljudje razumeli in spoznali svojo osebnost, ter osebnostne tipe drugih ljudi, bi se problemi pri komunikaciji občutno zmanjšali. Takrat bi namreč lažje uvideli, zakaj je nekdo reagiral na način, kot je ali zakaj je nekdo dejal to, kar je. Smisel tega je, da spoznamo svoje dobre lastnosti, ki jih lahko še bolj razvijemo, slabe pa poskušamo nadzorovati in tako zmanjšati njihov vpliv. Iskanje uspešnih in učink...

  13. SPOLNO NADLEGOVANJE NA DELOVNEM MESTU

    OpenAIRE

    Rubič, Gašper

    2016-01-01

    V diplomskem delu smo v uvodu predstavili problem spolnega nadlegovanja na delovnem mestu in predstavili podjetje TEKSTIL d.d. V nadaljevanju smo z anketo raziskali, ali problem spolnega nadlegovanja na delovnem mestu v obravnavanem podjetju obstaja in če, kako se nanj odziva okolje. V teoretičnem delu smo nadaljevali in predstavili definicijo spolnega nadlegovanja, ki je kakršna koli oblika nezaželenega verbalnega in neverbalnega ali fizičnega ravnanja spolne narave z učinkom ali nameno...

  14. Estudo de catalisadores a base de cobre e nióbia na reação de reforma a vapor de etanol = Study of catalysts based on copper and niobium oxide in steam reforming of ethanol

    Directory of Open Access Journals (Sweden)

    Roberta Carolina Pelissari Rizzo-Domingues

    2007-01-01

    Full Text Available Catalisadores Cu/Nb2O5 foram modificados pela incorporação de MgO ouK2O (redutores da acidez do suporte ou Ni (um facilitador da quebra da ligação C-C para serem utilizados na reforma do etanol em unidade de bancada com leito catalítico de 7 g a 573 K, variando-se a velocidade espacial e a razão molar dos reagentes de modo a otimizar oprocesso de produção de hidrogênio com conseqüente diminuição de subprodutos. Os catalisadores foram caracterizados por área superficial específica, difração de raios-X e redução à temperatura programada. Pôde-se verificar que a introdução de óxido dopante daacidez ou de um segundo metal provocou um aumento da porosidade e da temperatura de início de redução do cobre nos catalisadores, alterando dessa forma a superfície catalítica. A redução da acidez do suporte diminuiu a formação de subprodutos e aumentou a dehidrogênio. Níquel como segundo metal aumentou a produção de CO e CH4.Cu/Nb2O5 catalysts were modified by the incorporation of MgOor K2O (support acidity reducer and Ni (a facilitator of the bond break C-C to be used in the ethanol reforming in bench-scale unit with catalytic bed of 7 g at 573 K, varying the space velocity and the molar rate of the reagents in order to optimize the process ofproduction of hydrogen with consequent decrease of by-products. The catalysts were characterized by specific superficial area, X-ray diffraction and temperature programmed reduction. Results showed that the introduction of the basic oxide or a second metal, nickel, lead to an increase in the porosity and in the temperature at the beginning of copper reduction in the catalyst. The acidity reduction of the support decreased the formation of by-products and increased the hydrogen formation. Nickel as a second metal increased theproduction of CO and CH4.

  15. Imagens urbanas: diretrizes de planejamento e desenho urbano baseadas na leitura popular de espaços públicos Urban images: guidelines to urban planning and design based in the popular reading of public spaces

    Directory of Open Access Journals (Sweden)

    mail: elsonmp@hotmail.com

    2010-04-01

    Full Text Available O presente artigo surgiu a partir do questionamento de como seria possível compreender e aplicar o imaginário coletivo no processo de planejamento e desenho urbanos. O objetivo principal, então, é o de demonstrar como se deu a aplicação prática do cruzamento de métodos de leitura de imagens mentais, numa tentativa de instrumentalizar a leitura popular. Por meio de pesquisa com o público usuário do Largo da Ordem, em Curitiba, PR, nos anos de 2004 e 2005, e com base em pesquisa documental, entrevistas e desenhos feitos pela comunidade, os autores obtiveram material necessário para aplicar o método de mapas cognitivos e criar arborescências, das quais puderam ser extraídas diretrizes para um planejamento e desenho urbanos mais próximos à realidade dos usuários da cidade, tentando ratificar a leitura comunitária preconizada por um planejamento urbano participativo. A partir de pesquisa qualitativa, puderam ser delineadas diretrizes de re-dinamização sócio-espacial para tal recorte, com respaldo tanto na bibliografia estudada quanto no material obtido com a comunidade, ratificando que, ao instrumentalizar a comunidade, é possível abrir um caminho para o diálogo entre o técnico e o cidadão (que também inclui os técnicos, pois esses habitam a cidade.

  16. Effects of SrTiO3 on dielectric and piezoelectric properties of K0.48Na0.48Li0.04Nb0.96Ta0.04O3-based piezoceramics

    International Nuclear Information System (INIS)

    Bafandeh, Mohammad Reza; Abbasi, Mohammad Hasan; Saidi, Ali; Lee, Jae-Shin

    2013-01-01

    Highlights: ► Sodium potassium niobate based piezoceramics modified with SrTiO 3 (ST) were prepared. ► Crystal structure, microstructure and dielectric properties of ceramics were investigated. ► Addition of ST more than 3 mol% changed ferroelectric behavior from normal to relaxor. ► Coexistence of two structures in ceramic with 1 mol% ST enhanced piezoelectric constant. - Abstract: In this study, (100 − x) K 0.48 Na 0.48 Li 0.04 Nb 0.96 Ta 0.04 O 3 − xSrTiO 3 (0 ≤ x ≤ 10) ceramics were fabricated via normal sintering of synthesized powder by using solid state reaction. All ceramics revealed pure perovskite structure, indicating formation of solid solution between KNNLT and ST up to 10%. With increasing x, the crystal structure of ceramics changed from orthorhombic to tetragonal and finally pseudocubic symmetry when x = 10. Ceramic containing 1% ST had orthorhombic and tetragonal symmetries, simultaneously. Investigation of the variation of dielectric constant of ceramics versus temperature revealed that for ceramic with x = 1, polymorphic phase transition (PPT) temperature between orthorhombic and tetragonal is less than room temperature. Thus coexistence of two different structures in this ceramic is due to vicinity of its composition to morphotropic phase boundary (MPB). As a result, the maximum piezoelectric constant was measured for this ceramic. Ceramics containing 5 and 7.5% ST tend to appear relaxor ferroelectric behavior which is because of chemical inhomogeneities in both A- and B-sites of the ABO 3 perovskite structure.

  17. O Personal Trainer na Perspectiva do Marketing

    Directory of Open Access Journals (Sweden)

    Cibele Biehl Bossle

    2011-03-01

    Full Text Available Esse estudo apresenta mapeamento das referências dedicadas à formação do personal trainer em bases de dados eletrônicas. Essa garimpagem revelou baixa produção científica sobre o assunto e mostrou que na literatura sobre personal trainer predominam livros com linguagem corrente no mundo dos negócios. Esses achados nos levaram a indagar sobre a força do discurso físico-empresarial, especialmente o marketing, na constituição desta ocupação profissional. Jeremy Rifkin, Zygmunt Bauman, Paula Sibilia e Denise Sant'Anna permitiram visualizar que o marketing dirigido ao personal trainer tem como tarefa reinventar, ressignificar e "repaginar" esta modalidade de serviço em nome da sobrevivência no disputado mercado da vida ativa.

  18. The NA60 experiment readout architecture

    CERN Document Server

    Floris, M; Usai, G L; David, A; Rosinsky, P; Ohnishi, H

    2004-01-01

    The NA60 experiment was designed to identify signatures of a new state of matter, the Quark Gluon Plasma, in heavy-ion collisions at the CERN Super Proton Synchroton. The apparatus is composed of four main detectors: a muon spectrometer (MS), a zero degree calorimeter (ZDC), a silicon vertex telescope (VT), and a silicon microstrip beam tracker (BT). The readout of the whole experiment is based on a PCI architecture. The basic unit is a general purpose PCI card, interfaced to the different subdetectors via custom mezzanine cards. This allowed us to successfully implement several completely different readout protocols (from the VME like protocol of the MS to the custom protocol of the pixel telescope). The system was fully tested with proton and ion beams, and several million events were collected in 2002 and 2003. This paper presents the readout architecture of NA60, with particular emphasis on the PCI layer common to all the subdetectors. (16 refs).

  19. Urgências reprodutivas na cadela

    OpenAIRE

    Costa, Teresa Isabel Rodrigues da

    2010-01-01

    Dissertação de Mestrado Integrado em Medicina Veterinária As urgências reprodutivas ocorrem com frequência na prática clínica, estando o seu desfecho favorável associado a um diagnóstico e intervenção céleres. Na cadela, consideram-se urgências reprodutivas a distócia, a piómetra, o prolapso uterino, a torção uterina, a tetania puerperal, a metrite e a mastite. Esta dissertação tem por base a análise dos dados referentes à casuística de urgências reprodutivas em cadelas veri...

  20. Room-temperature ferromagnetism in Fe-based perovskite solid solution in lead-free ferroelectric Bi0.5Na0.5TiO3 materials

    Science.gov (United States)

    Hung, Nguyen The; Bac, Luong Huu; Trung, Nguyen Ngoc; Hoang, Nguyen The; Van Vinh, Pham; Dung, Dang Duc

    2018-04-01

    The integration of ferromagnetism in lead-free ferroelectric materials is important to fabricate smart materials for electronic devices. In this work, (1 - x)Bi0.5Na0.5TiO3 + xMgFeO3-δ materials (x = 0-9 mol%) were prepared through sol-gel method. X-ray diffraction characterization indicated that MgFeO3-δ materials existed as a well solid solution in lead-free ferroelectric Bi0.5Na0.5TiO3 materials. The rhombohedral structure of Bi0.5Na0.5TiO3 materials was distorted due to the random distribution of Mg and Fe cations into the host lattice. The reduced optical band gap and the induced room-temperature ferromagnetism were due to the spin splitting of transition metal substitution at the B-site of perovskite Bi0.5Na0.5TiO3 and the modification by A-site co-substitution. This work elucidates the role of secondary phase as solid solution in Bi0.5Na0.5TiO3 material for development of lead-free multiferroelectric materials.

  1. Critérios de projeto e benefícios esperados da implantação de técnicas compensatórias em drenagem urbana para controle de escoamentos na fonte, com base em modelagem computacional aplicada a um estudo de caso na zona oeste do Rio de Janeiro

    Directory of Open Access Journals (Sweden)

    Anaí Floriano Vasconcelos

    Full Text Available RESUMO O processo de urbanização resulta em alterações no ciclo hidrológico prejudiciais à população. Para amenizar esses efeitos, as técnicas compensatórias em drenagem urbana visam à maior sustentabilidade hidrológica na expansão urbana. Nesse sentido, este artigo teve como objetivos avaliar, por meio de modelagem computacional, o efeito da adoção dessas técnicas na escala de lote e da bacia hidrográfica e avançar com diferentes possibilidades de concepção de projeto. A modelagem foi realizada para diversos cenários, considerando a implantação das técnicas de forma isolada e combinada. Os parâmetros utilizados na modelagem visaram verificar possibilidades extremas de aplicação, de modo a disponibilizar dados para balizamento de projetos reais. As chuvas avaliadas possuem variadas durações e intensidades, facilitando a extrapolação dos resultados deste trabalho para bacias hidrográficas de diferentes escalas. Os resultados das simulações indicam potenciais benefícios na drenagem urbana oriundos do uso dessas técnicas no lote, com mais efetividade para as menores chuvas de projeto. Esse foi o caso dos cenários que avaliaram os jardins rebaixados isoladamente ou combinados em série com um reservatório de lote e os cenários de pavimentos permeáveis na calçada que receberiam o escoamento superficial do lote adjacente. Também foi verificado que a combinação paralela de um reservatório de lote com as dimensões propostas pela legislação municipal e um jardim rebaixado em 0,07 m seria capaz de neutralizar, hidrologicamente, os impactos da ocupação do lote para todas as chuvas de projeto analisadas, entretanto o reservatório proposto pela legislação municipal, quando adotado isoladamente, quase não atuou na escala da bacia..

  2. Beam monitoring at NA2

    CERN Multimedia

    1978-01-01

    Claus Goessling working on the beam Cerenkov counter of NA2. The muon beam enters from left the hall EHN2 and the last element of the beam transport. On background is the access door on the Jura side.

  3. Muscle-based perception: theory, research and implications for rehabilitation Percepção baseada nos músculos: teoria, pesquisa e implicações na reabilitação

    Directory of Open Access Journals (Sweden)

    C Carello

    2008-10-01

    Full Text Available BACKGROUND: Muscle-based perception of the spatial properties of limbs constrains the patterning, timing and magnitude of muscle forces while performing motor activities. The centrality of muscle-based perception to both ordinary and skilled actions warrants attention from the rehabilitation community, since deficits in its functioning would be related to important functional limitations. In this overview, we summarize a body of research that may be used to guide the development of effective assessment tools and rehabilitation programs that are specifically directed towards such deficits. OBJECTIVES: There were four specific aims: first, to present an information-based approach to muscle-based perception that is grounded in physical laws; second to identify central principles underlying muscle-based perception that have been revealed and supported by empirical work; third, to summarize reports that have investigated whether the principles identified can be generalized to muscle-based perception in individuals with sensory-motor impairments; and fourth to provide a preliminary discussion of the potential implications of the research presented here for issues relating to rehabilitation.INTRODUÇÃO: A percepção muscular das propriedades espaciais dos membros restringe o padrão, período e magnitude das forças exercidas durante a execução de atividades motoras. A importância central da percepção muscular, tanto para ações rotineiras quanto para ações especializadas, merece atenção da comunidade envolvida na área de reabilitação, uma vez que alterações em suas funções podem estar relacionadas a importantes limitações funcionais. Nesta revisão, os autores apresentam um resumo da pesquisa que pode ser utilizada para guiar o desenvolvimento de ferramentas de avaliação eficazes bem como programas de reabilitação que sejam especificamente direcionados para estas disfunções. OBJETIVOS: Quatro pontos específicos foram inclu

  4. Risbjerg: Historisk stemmeskred med NA

    DEFF Research Database (Denmark)

    Thomsen, Søren Risbjerg

    2007-01-01

    ANALYSE: NA flytter 12,3 pct. af stemmerne i majs meningsmålinger - historisk mange vælgere på en måned, skriver professor Risbjerg. Udgivelsesdato: 3. juni 2007......ANALYSE: NA flytter 12,3 pct. af stemmerne i majs meningsmålinger - historisk mange vælgere på en måned, skriver professor Risbjerg. Udgivelsesdato: 3. juni 2007...

  5. How well is hypertension managed in the community? A population-based survey in a Brazilian city O manejo da hipertensão arterial sistêmica na comunidade:estudo de base populacional em uma cidade brasileira

    Directory of Open Access Journals (Sweden)

    Roberto X. Piccini

    1997-10-01

    Full Text Available There is usually little information available on how well hypertensive individuals are managed at the community level. This survey measured the frequency of hypertension in a medium-sized Brazilian city by studying a cluster sample of 1657 adults aged 20-69 years. The 328 hypertensives (19.8% answered a questionnaire on the knowledge and management of their condition. Two-thirds were aware of their status and more than half were on antihypertensive medication, but only one-third had their blood pressure under control. Physicians failed to advise a large proportion of their patients about the need to lose weight, take exercise, and quit smoking. Although laboratory tests were carried out in most patients, fundoscopy and chest X-rays were performed in fewer than 50%. Continued care by the same physician was the only factor significantly associated with compensated high blood pressure (relative risk for not having continued care = 1.35; 95% CI = 1.02-1.71. High levels of absenteeism, reduction of the work load, and early retirement were found among the individuals with high blood pressure.Há poucas informações disponíveis a respeito do manejo de pacientes hipertensos na comunidade. Esse estudo mede a freqüência de hipertensão em uma cidade de médio porte do Brasil ao estudar uma amostra aleatória de 1.657 adultos com idade entre 20 e 69 anos. Os 328 hipertensos (19,8% encontrados foram submetidos a um questionário que investigava o conhecimento a respeito de sua condição e dados do manejo deste problema. Dois terços deles sabiam ser hipertensos, mais da metade usava medicação para hipertensão, mas apenas um terço apresentava cifras tensionais controladas. Os médicos não recomendaram, para muitos dos seus pacientes, realizarem exercícios físicos, abandonar o tabagismo e reduzirem o peso corporal. Embora exames laboratoriais tenham sido realizados em muitos pacientes, exame de fundo de olho e Rx de tórax foram feitos em menos de

  6. La asociacion Monzonitica del Domo Anatectico del Tormes: geoquimica y petrogenesis

    Directory of Open Access Journals (Sweden)

    López Plaza, M.

    2001-08-01

    Full Text Available In certain peripheral zones of the Anatectic Tormes Dome there exists a group of rocks, which are from basic to acid as well as rich in alkali feldspar, apatite and allanite. Such an unusual mineralogy makes the rocks to be enriched in K20, P2O5, LREE and other elements of low ionic potential. Their geochemical signature is related to the volcanic shoshonites, to the vaugnerites of the French Central Massif as well as to the monzonitic series of Ballon, being, in turn, almost exceptional in the iberian variscan. The least evolved terms are rather fractionated, therefore, they are not primary melts. During the differentiation, the saturation of accessory phases such as apatite, allanite and zircon exerts an important effect in the evolution of the residual liquid giving rise to an inflection point in the Harker diagrams. From the good adjustments obtained in mass balance and Rayleigh fractionation modelling, we can infer that the process of fractional crystallization is the dominant one. In this respect, the porphyritic granitoids can be derived from a liquid of monzodioritic composition, being rocks genetically to the associated acid rocks. The corroded cores of plagioclase and the spatial relations suggest the existence of different pulses of magma from basic to acid coming from the same magmatic chamber.En dos bandas del Domo anatéctico del Tormes aparece un conjunto de rocas plutónicas desde básicas a ácidas ricas en feldespato potásico, apatito y allanita. Esta mineralogía tan particular hace que estén enriquecidas en K20, P205, LREE y otros elementos de bajo potencial iónico. Su quimismo es afín a las shoshonitas volcánicas, a las vaugneritas del Macizo Central francés y a las series monzoníticas de Ballon, siendo, a su vez, casi excepcional en el varisco ibérico. Los términos menos evolucionados están bastante fraccionados por lo que no se trata de fundidos primarios. Durante la diferenciación existen fases accesorias como apatito, allanita y circón cuya saturación ejerce un importante efecto en la evolución del líquido residual originando evoluciones quebradas en los diagramas de Harker. A partir de los buenos ajustes obtenidos con las modelizaciones por balance de masas y fraccionación Rayleigh se infiere que el proceso de cristalización fraccionada es el dominante. En este sentido, se pueden hacer derivar los granitoides porfídicos a partir de un líquido de composición monzodiorítica, por lo que no quedan desconectadas las rocas básicas de las ácidas asociadas. Los núcleos corroídos de plagioclasa y las relaciones espaciales parecen indicar que han existido distintos pulsos de magma desde básicos a ácidos procedentes de la misma cámara magmática.

  7. Uranium project. Geochemistry prospection[Study of Uranium geochemical prospection in Uruguay]; Proyecto Uranio. Prospeccion geoquimica

    Energy Technology Data Exchange (ETDEWEB)

    Lambert, J

    1983-07-01

    Geochemistry studies the distribution of the chemicals elements in the terrestrial crust and its ways to migrate. The terminology used in this report is the following one: 1) Principles of the prospection geochemistry 2) Stages of the prospection geochemistry 3)utility of the prospection geochemistry 4) geochemistry of uranium 5) procedures used within the framework of uranium project 6) Average available 7) Selection of the zones of prospection geochemistry 8) Stages of the prospection, Sample preparation and analisis 9) Presentation of the results.

  8. Influence of Y, Gd and Sm on the glass forming ability and thermal crystallization of aluminum based alloy; Efeito das terras raras Y, Gd e Sm na tendencia a formacao de amorfo e na cristalizacao termica em ligas a base de aluminio

    Energy Technology Data Exchange (ETDEWEB)

    Aliaga, L.C.R.; Bolfarini, C.; Kiminami, C.S.; Botta Filho, W.J., E-mail: aliaga@ufscar.b [Universidade Federal de Sao Carlos (DEMa/UFSCar), SP (Brazil). Dept. de Engenharia de Materiais; Danez, G.P. [Universidade Federal de Sao Carlos (PPG-CEMUFSCar), SP (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais

    2010-07-01

    Al-based amorphous alloys represent an important family of metals and a great scientific activity has been devoted to determine the main features of both glass forming ability (GFA) and crystallization behavior in order to have a comprehensive framework aimed at potential technological applications. Nowadays, it is well known that the best Al-based amorphous alloys are formed in ternary systems such as Al- RE-TM, where RE is a rare earth and TM a transition metal. This paper presents results of research in Al{sub 85}Ni{sub 10}RE{sub 5} alloys (RE = Y, Gd and Sm). Amorphous ribbons were processed by melt-spinning under the same conditions and subsequently characterized by x-ray diffraction (XRD) and differential scanning calorimetry (DSC). Results show appreciable micro structural differences as function of the rare earth, thus crystal is obtained for Y, nano-glassy for Gd and, fully amorphous structure for Sm. (author)

  9. Estimativas das componentes da radiação solar incidente em superfícies inclinadas baseadas na radiação global horizontal Estimates of solar radiation components on a tilted surface based on global horizontal radiation

    Directory of Open Access Journals (Sweden)

    Adilson P. Souza

    2011-03-01

    Full Text Available Foram avaliadas equações estatísticas de estimativas com agrupamentos de dados anuais e mensais e suas respectivas validações, para as componentes global, direta e difusa da radiação solar incidente em superfícies inclinadas a 12,85, 22,85 e 32,85º, com face para o Norte, nas condições climáticas e geográficas de Botucatu, SP. Empregou-se as frações das três componentes da radiação a do topo da atmosfera em correlação com o coeficiente de transmissividade atmosférica do plano horizontal, em uma base de dados de abril/1998 a dezembro/2007, cujas medidas nas três inclinações ocorreram em diferentes períodos, todavia concomitantes ao plano horizontal. O aumento do ângulo de inclinação da superfície propiciou aumento do espalhamento dos valores diários do índice de claridade para superfícies inclinada e horizontal. Nos agrupamentos anuais os piores desempenhos foram verificados na estimativa da radiação difusa diária para superfície inclinada, com valores máximos de espalhamentos iguais a 3,89 MJ m-2 d-1 (43,65% e ajustamento em torno de 62%. Na estimativa das componentes global e direta da radiação solar nos planos inclinados, podem ser aplicadas, tanto as equações anuais como as mensais, com desempenhos dependentes das condições climáticas.Statistics equations and validations with groups of annual and monthly data were evaluated for global, direct and diffuse solar radiation components incident on the tilted surface to 12.85, 22.85 and 32.85° with the face North, in climate and geographical conditions of Botucatu, SP. It was employed the fractions of three components of extraterrestrial radiation in correlation with the coefficient clearness index horizontal plane, in a database of April/1998 to December/2007, whose measures at different periods in three inclinations, however concomitant to the horizontal plane. Increasing the angle of the surface led to increased scattering of the daily values of

  10. Biosolids effectiveness to yield ryegrass based on their nitrogen content Eficiência de biossólidos na produção de azevém baseado no conteúdo de nitrogênio

    Directory of Open Access Journals (Sweden)

    Rodrigo Studart Corrêa

    2005-06-01

    Full Text Available Biosolids have been reported to increase yields and supply plant nutrients. However, complying with health and environmental standards is necessary before applying biosolids to land. Thus, sludge stabilization is required to make biosolids safe enough for their agricultural use. Side effects of stabilization processes on agronomic features of sewage sludge are not quite known, although their understanding is essential for biosolids management. Based on a model equivalent to the Mitscherlich equation, effects of the most common processes for sludge stabilization were evaluated (composting, liming, heat-drying and solar irradiation in relation to the agronomic effectiveness of biosolids to yield Lolium perenne L. on two tropical soils, with NH4H2PO4 as a reference. Sewage stabilization processes have affected the ability of biosolids to promote plant growth. Their effectiveness was usually higher than fertilizer in a Spodosol and lower in an Oxisol. Solar-irradiated sludge presented the highest effectiveness among the biosolids and reached peak yields at the lowest application rate independent on soil type. Biosolids could efficiently substitute fertilizers and even yield more plant dry matter than the NH4H2PO4 reference, depending on the biosolid and soil type.Biossólidos têm sido citados como capazes de aumentar a produção de culturas e suprir nutrientes para plantas. Questões sanitárias e ambientais demandam que eles sejam estabilizados para que sejam usados na agricultura. Os efeitos dos processos de estabilização sobre as propriedades agronômicas de biossólidos não são completamente conhecidos, apesar de essenciais para o seu manejo. Baseado em um modelo equivalente à equação de Mitscherlich, este trabalho avaliou os efeitos dos processos mais comuns para a estabilização de lodos de esgotos (compostagem, caleação, secagem térmica e irradiação solar sobre a eficiência agronômica de biossólidos na produção de Lolium

  11. O estudo e desenvolvimento do protótipo de uma ferramenta de apoio a formulação de consultas a bases de dados na área da saúde

    OpenAIRE

    Carine Geltrudes Webber

    1997-01-01

    O objetivo deste trabalho é, através do estudo de diversas tecnologias, desenvolver o protótipo de uma ferramenta capaz de oferecer suporte ao usuário na formulacdo de uma consulta a MEDLINE (Medical Literature Analysis and Retrieval System On Line). A MEDLINE é um sistema de recuperação de informações bibliográficas, na área da biomedicina, desenvolvida pela National Library of Medicine. Ela é uma ferramenta cuja utilizando tem sido ampliada nesta área em decorrência do aumento da utilizando...

  12. Investigation of the structure and properties of (KxNa1-x)NbO3-based piezoelectric ceramics using both conventional and high-throughput experimentation (HTE) methods

    International Nuclear Information System (INIS)

    Mgbemere, Henry Ekene

    2012-01-01

    The structure and properties of (K x Na 1-x )NbO 3 lead-free piezoelectric ceramics was investigated in this work. Both the conventional mixed-oxide ceramics synthesis route and the high-throughput experimentation (HTE) approaches were employed for the synthesis. Structural characterization was carried out with synchrotron X-rays while the electrical properties were characterized with techniques (dielectric measurement, hysteresis measurements, impedance measurements etc). Both isovalent and aliovalent elements (Ta, Sb, Li) were used to dope (K x Na 1-x )NbO 3 ceramics in order to improve its piezoelectric properties and sinterability.

  13. Ortodontia baseada em evidência científica: incorporando ciência na prática clínica Scientific evidence-based orthodontics: incorporating science within clinic practice

    Directory of Open Access Journals (Sweden)

    Maria Tereza Scardua Mariano

    2009-06-01

    Full Text Available O objetivo deste artigo é despertar o ortodontista e conscientizá-lo sobre a importância da tomada de decisão baseada em evidência científica no cuidado aos pacientes. Serão descritos os passos essenciais para a prática da Odontologia baseada em evidência (OBE, assim como os princípios da ciência e da pesquisa. Existem caminhos adequados para a busca da informação de qualidade, sendo esses a única garantia de encontrar artigos válidos. Na seleção de artigos científicos, o primeiro passo é definir o seu desenho, pois para cada dúvida clínica há um delineamento adequado capaz de respondê-la. Dessa maneira, questões sobre tratamento, etiologia, diagnóstico, prognóstico ou prevenção só podem ser respondidas por um artigo que tenha sido delineado para tal. O conhecimento da alocação randomizada, do mascaramento e do grupo-controle é fundamental para que possamos realizar uma leitura crítica dos artigos científicos, reconhecendo os que merecem credibilidade. Em meio a tantas publicações, precisamos definir, com segurança, o que deve ser incorporado ao nosso conhecimento e o que deve ser incorporado à prática clínica, mudando a nossa conduta. Desse modo, poderemos oferecer aos nossos pacientes opções terapêuticas mais consistentes e previsíveis.The aim of this article is to warn the orthodontist about the importance of making decision based on scientific evidence when taking care of the patients. It describes the main steps for the Dentistry practices based in evidence (EBD as well as the science and research principles. There are adequate ways for the search of quality information. While selecting the scientific articles, the first step would be defining its design, since for each question there is an adequate delineation able to answer it. Questions about treatment, etiology, diagnostic, prognostic or prevention could be answered in the article if it has been delineated for that. Understanding the meaning

  14. Currículo por competências na área de biodiagnóstico: desafios de implantação Skill-based curriculum in biological diagnosis: implementation challenges

    Directory of Open Access Journals (Sweden)

    Maria Beatriz S. C. de Oliveira

    2006-03-01

    Full Text Available O presente trabalho objetivou investigar a adoção da noção de competências na organização curricular do Curso Técnico de Laboratório em Biodiagnóstico em Saúde, da Escola Politécnica de Saúde Joaquim Venâncio (EPSJV, unidade técnico-científica da Fundação Oswaldo Cruz (Fiocruz. A pesquisa enfocou a viabilidade da ressignificação desse modelo a partir da adoção da matriz crítico-emancipatória proposta por Deluiz, Ramos e Kuenzer. A pesquisa, de natureza qualitativa, foi realizada por meio de entrevistas com professores da instituição. Os resultados apontaram que a adoção do modelo de competências não se deu por opção pedagógica, mas por imposição legal das instâncias normativas. A identificação, definição e construção de competências que orientaram a organização curricular foram efetuadas através da perspectiva totalizante, ao buscar contemplar as diversas dimensões do conhecimento. A operacionalização desse modelo e o desenvolvimento da dimensão subjetiva das competências mostraram-se o maior desafio enfrentado pelos docentes³.This article investigates the incorporation of the notion of 'skills' in the development of the Vocational Course on Laboratory in Biological Diagnosis in Health of the Joaquim Venâncio Polytechnic Health School (EPSJV, a technical and scientific unit of the Oswaldo Cruz Foundation (Fiocruz. The conducted research focused on determining validity and viability of understanding the skill-based curriculum in the light of the critical/emancipatory approach proposed by Deluiz, Ramos and Kuenzer. The qualitative research was comprised of interviews with teachers of the institution. Results show that the implementation of skill-based ideas was the result of legal determination, not an agreed pedagogical approach. Besides that, the identification, selection and development of skills guiding the development of the curriculum were performed with a totalizing perspective in mind

  15. Issuing of Regulations on the Clearance of Irradiated Food Products on the Basis of Foreign Petitions; Promulgation d'un Reglement Regissant l'Autorisation de Commercialiser des Denrees Alimentaires Irradiees, sur la Base de Demandes Fondees sur des Donnees Elaborees a l'Etranger; Protsedura polucheniya razreshenij na prodazhu obluchennykh pishchevykh produktov na baze inostrannykh khodatajstv; Autorizacion del Consumo de Productos Alimenticios Irradiados, Sobre la Base de Investigaciones Realizadas en el Extranjero

    Energy Technology Data Exchange (ETDEWEB)

    Foa, E.; Eisenberg, E.; Kahan, R. S.; Lapidot, M. [Soreq Nuclear Research Centre, Yavne (Israel)

    1966-11-15

    Since the beginning of 1965, Israel has been interested in legal problems on the clearance of irradiated food and in the installation of a food irradiator. Supervision and control of the irradiation, and distribution of the irradiated products, the applications of relevant laws, or their enactment where none exist, are some points of special importance among those dealt with. Most legislation now requires that the wholesomeness of irradiated food be proven unequivocably before irradiation and consumption of the food are authorized. Such proof, however, is beyond the means of small, and of developing countries, the very ones which could most benefit from the introduction of irradiation techniques on an industrial scale, since this would increase both the availability of local foods for internal consumption and also export possibilities. As a test case, on 24 February 1966, a petition was submitted to the Israel Ministry of Health for permission to use, for human consumption, white potatoes which had been irradiated to prevent sprouting. The petition was based not on local work, but on that published abroad, with the request that the wholesomeness tests approved by other governments be accepted as sufficient proof. Another similar petition on the use of irradiated onions will be submitted shortly. If successful, this procedure could be adopted by other countries and might facilitate international trade agreements. It could be instrumental in the rapid development of the application of irradiation for food preservation in places where it could prove of useful economic value. (author) [French] Depuis le debut de 1965, Israeel s'interesse aux problemes juridiques que'pose l'autorisation de vendre des aliments irradies et a l'installation d'un irradiateur. Parmi les points les plus importants qui font l'objet d'une etude, il convient de citer le controle de l'irradiation et de la distribution des produits irradies, l'application des lois pertinentes et, le cas echeant

  16. Performance of adhesives base on PU, Epoxy and silane in the Kevlar/alumina interface; Desempenho de adesivos a base de PU, epoxi e silano na interface Kevlar/alumina

    Energy Technology Data Exchange (ETDEWEB)

    Noronha, K.F.; Melo, F.C.L.; Lopes, C.M.A. [Divisao de Materiais, Instituto de Aeronautica e Espaco (IAE), Sao Jose dos Campos, SP (Brazil); Divisao de Engenharia Mecanica-Aeronautica, Instituto Tecnologico de Aeronautica (ITA), Sao Jose dos Campos, SP (Brazil)], e-mail: cmoniz@iae.cta.br

    2010-07-01

    Hybrid ceramic/polymer composites are used for ballistic protection due to the good high-velocity impact absorption properties. The choice of the proper adhesive used to bond ceramic and polymer layers is one of the major issues for hybrid armor development due to its influence in the ballistic resistance behaviour. This work presents an adhesion study in composites of aramid textile (Kevlar) and alumina. Adhesives of different chemical nature, based on polyurethane, epoxy and silane were evaluated. T-Peel test was performed for the interface characterization and the post- failure surfaces were examined by optical microscopy. In all samples the failure occurred at the interface. The silane-based adhesive showed no interaction with the polymer, while the PU hot melt adhesive presented the highest adhesion strengths. (author)

  17. NaI Detector Network at Aragats

    International Nuclear Information System (INIS)

    Avakyan, Karen; Arakelyan, Karen; Chilingarian, Ashot; Daryan, Ara; Kozliner, Lev; Mailyan, Bagrat; Hovsepyan, Gagik; Pokhsraryan, David; Sargsyan, David

    2013-01-01

    The Aragats Space Environmental Center (ASEC) provides monitoring of different species of secondary cosmic rays and consists of two high altitude research stations on Mt. Aragats in Armenia. Along with solar modulation effects, ASEC detectors register several coherent enhancements associated with thunderstorm activity. The experimental techniques used allowed for the first time to simultaneously measure fluxes of the electrons, muons, gamma rays, and neutrons correlated with thunderstorm activity. Ground-based observations by a complex of surface particle detectors, measuring in systematically and repeatable fashion, gamma quanta, electrons, muons and neutrons from atmospheric sources are necessary for proving the theory of particle acceleration and multiplication during thunderstorms. Energy spectra and correlations between fluxes of different particles, measured on Earth's surface address the important issues of research of the solar modulation effects and the atmospheric high-energy phenomena. In May 26 2011, launched 5 NaI(Tl) (thallium-doped sodium iodide) scintillation detectors and 1 plastic one in the new ASEC laboratory on Aragats to detect low energy gamma rays from the thunderclouds and short particle bursts. Including NaI(Tl) detectors in ASEC detectors system is of great importance for investigation thunderstorm phenomena because NaI(Tl) detectors have high efficiency of gamma ray detecting in comparison with plastic ones.

  18. NA64 Search for Dark Photons

    CERN Document Server

    Shiakas, Christos

    2017-01-01

    The NA64 experiment, known as P348 before official approval, was proposed to the CERN SPSC on January 2014 with main goal the search for the following decay modes A′ → invisible A′ → e−e+ (1) In March 2016 P348 was granted approval by the CERN Research Board and received the title NA64. Since having been promoted, the experiment has been conducting the searches the searches for the processes mentioned above at the CERN SPS. NA64 is a fixed target experiment which utilizes the active beam dump. The detection of rare processes is based on the missing energy techniques. Such techniques are used for particles whose interaction with the detector is very small, so that they escape the detection and carry away some energy. A significant missing energy in the experiment means that such particles are produced. The method of the search for the A′ → invisible decay is as follows. If the A′ exists it could be produced via the kinetic mixing with bremsstrahlung photons in the reaction of high-energy elec...

  19. Epistaxis na een schedeltrauma

    NARCIS (Netherlands)

    Nooij, Roland P; van Dijk, J M C Marc; Groen, Rob J M; Uyttenboogaart, Maarten; Eshghi, Omid S; Korsten-Meijer, Astrid G W

    2015-01-01

    BACKGROUND: Epistaxis is a common problem, which is usually benign in nature. In some cases, however, epistaxis is a symptom of a severe underlying condition. CASE DESCRIPTION: A 20-year-old male was treated conservatively following head injury with craniofacial and base-of-skull fractures.

  20. Carbon dioxide sequestration using NaHSO4 and NaOH: A dissolution and carbonation optimisation study.

    Science.gov (United States)

    Sanna, Aimaro; Steel, Luc; Maroto-Valer, M Mercedes

    2017-03-15

    The use of NaHSO 4 to leach out Mg fromlizardite-rich serpentinite (in form of MgSO 4 ) and the carbonation of CO 2 (captured in form of Na 2 CO 3 using NaOH) to form MgCO 3 and Na 2 SO 4 was investigated. Unlike ammonium sulphate, sodium sulphate can be separated via precipitation during the recycling step avoiding energy intensive evaporation process required in NH 4 -based processes. To determine the effectiveness of the NaHSO 4 /NaOH process when applied to lizardite, the optimisation of the dissolution and carbonation steps were performed using a UK lizardite-rich serpentine. Temperature, solid/liquid ratio, particle size, concentration and molar ratio were evaluated. An optimal dissolution efficiency of 69.6% was achieved over 3 h at 100 °C using 1.4 M sodium bisulphate and 50 g/l serpentine with particle size 75-150 μm. An optimal carbonation efficiency of 95.4% was achieved over 30 min at 90 °C and 1:1 magnesium:sodium carbonate molar ratio using non-synthesised solution. The CO 2 sequestration capacity was 223.6 g carbon dioxide/kg serpentine (66.4% in terms of Mg bonded to hydromagnesite), which is comparable with those obtained using ammonium based processes. Therefore, lizardite-rich serpentinites represent a valuable resource for the NaHSO 4 /NaOH based pH swing mineralisation process. Copyright © 2016 Elsevier Ltd. All rights reserved.

  1. 3D coordination polymers with nitrilotriacetic and 4,4'-bipyridyl mixed ligands: structural variation based on dinuclear or tetranuclear subunits assisted by Na-O and/or O-H...O interactions.

    Science.gov (United States)

    Lü, Xing-Qiang; Jiang, Ji-Jun; Chen, Chun-Long; Kang, Bei-Sheng; Su, Cheng-Yong

    2005-06-27

    The reactions of Cu(II) with the mixed nitrilotriacetic acid (H3NTA) and 4,4'-bipyridyl (4,4'-bpy) ligands in different metal-to-ligand ratios in the presence of NaOH and NaClO4 afforded two complexes, Na3[Cu2(NTA)2(4,4'-bpy)]ClO4 x 5H2O (1) and [Cu2(NTA) (4,4'-bpy)2]ClO4 x 4H2O (2). The two complexes have been characterized by elemental analysis, IR, XRD, and single-crystal X-ray diffraction. 1 contains a basic doubly negatively charged [Cu2(NTA)2(4,4'-bpy)]2- dinuclear unit which was further assembled via multiple Na-O and O-H...O interactions into a three-dimensional (3D) pillared-layer structure. 2 features a two-dimensional (2D) undulated brick-wall architecture containing a basic doubly positively charged [Cu4(NTA)2(4,4'-bpy)2]2+ tetranuclear unit. The 2D network possesses large cavities hosting guest molecules and was further assembled via O-H...O hydrogen bonds into a 3D structure with several channels running in different directions.

  2. Bulk modulus of basic sodalite, Na8[AlSiO4]6(OH)2·2H2O, a possible zeolitic precursor in coal-fly-ash-based geopolymers

    KAUST Repository

    Oh, Jae Eun; Moon, Juhyuk; Mancio, Mauricio; Clark, Simon M.; Monteiro, Paulo J.M.

    2011-01-01

    Synthetic basic sodalite, Na8[AlSiO4] 6(OH)2•2H2O, cubic, P43n, (also known as hydroxysodalite hydrate) was prepared by the alkaline activation of amorphous aluminosilicate glass, obtained from the phase separation of Class F fly ash. The sample

  3. Dialogia do riso: um novo conceito que introduz alegria para a promoção da saúde apoiando-se no diálogo, no riso, na alegria e na arte da palhaçaria Dialogy of Laughter: a new concept introducing joy for health promotion based on dialogue, laughter, joy and the art of the clown

    Directory of Open Access Journals (Sweden)

    Marcus Vinicius Campos Matraca

    2011-10-01

    Full Text Available Apresentamos e debatemos a Dialogia do Riso, um conceito baseado na prática da educação popular em saúde desenvolvida com alegria. Saúde entendida como um recurso para a vida e não como um objetivo de viver; promoção da saúde como uma reação positiva que leva a uma percepção ampliada, integrada, complexa e intersetorial: articula ambiente, educação, pessoas, estilo e qualidade de vida. O riso pode então ser incorporado como ferramenta de promoção da saúde, tese que defendemos. Para isso apresentamos considerações sobre o diálogo, o riso, a alegria e o palhaço, conceituando a Dialogia do Riso. O diálogo, fala entre duas ou mais pessoas para entendimento de alguma ideia mediada pela comunicação, é uma metodologia de reflexão conjunta, que visa melhorar a produção de novas ideias e compartilhar significados, essência da comunicação. O riso é um fenômeno universal, condicionado a aspectos da cultura, da filosofia, da história e da saúde; é dialógico, porque, através do humor nos deparamos com a comédia e o escárnio que existe por traz de cada riso, um código de comunicação inerente à natureza humana. Arrolamos argumentos para defender a alegria como estratégia para a promoção da saúde, e adotamos o palhaço, e usamos sua arte como ferramenta educacional que pode ser integrada como tecnologia social.The Dialogy of Laughter - a concept based upon the praxis of general health education performed with joy - is presented and discussed. Health is seen as a resource for life rather than a goal in life and promotion of health is a positive reaction leading to a broader, integrated and complex perception linking the environment, education, people, quality and style of life. Laughter can then be incorporated as a tool in health promotion as defended here. Considerations on dialogue, laughter, joy and the clown giving rise to the Dialogy of Laughter concept are presented. Dialogue, namely an exchange between

  4. Redetermination of Na(3)TaF(8).

    Science.gov (United States)

    Langer, Vratislav; Smrcok, Lubomír; Boca, Miroslav

    2010-09-01

    The crystal structure of trisodium octafluoridotantalate, Na(3)TaF(8), has been redetermined using diffractometer data collected at 153 K, resulting in more accurate bond distances and angles than obtained from a previous structure determination based on film data. The structure is built from layers running along [101], which are formed by distorted [TaF(8)] antiprisms and [NaF(6)] rectangular bipyramids sharing edges and corners. The individual layers are separated by eight-coordinated Na ions. Two atoms in the asymmetric unit are in special positions: the Ta atom is on a twofold axis in Wyckoff position 4e and one of the Na ions lies on an inversion centre in Wyckoff site 4d.

  5. Mechanochemical transformations in Li(Na)AlH4-Li(Na)NH2 systems

    International Nuclear Information System (INIS)

    Dolotko, Oleksandr; Zhang Haiqiao; Ugurlu, Ozan; Wiench, Jerzy W.; Pruski, Marek; Scott Chumbley, L.; Pecharsky, Vitalij

    2007-01-01

    Mechanochemical transformations of tetrahydroaluminates and amides of lithium and sodium have been investigated using gas volumetric analysis, X-ray powder diffraction, solid-state nuclear magnetic resonance (NMR) and transmission electron microscopy. In a transformation of LiAlH 4 and LiNH 2 taken in an 1:1 molar ratio, the amount of released hydrogen (6.6 wt.% after 30 min ball milling) was higher than in any known one pot mechanochemical process involving a hydrogen-containing solid. A total of 4.3 wt.% of hydrogen is released by the NaAlH 4 -NaNH 2 system after 60 min ball milling; and 5.2 wt.% H 2 is released when LiAlH 4 and NaNH 2 or NaAlH 4 and LiNH 2 are ball milled for 90 min and 120 min, respectively. All transformations proceed at room temperature. The mechanism of the overall transformation MAlH 4 (s) + MNH 2 (s) → 2MH(s) + AlN(s) + 2H 2 (g) was identified based on detailed spectroscopic analysis of the intermediate (M 3 AlH 6 ) and final products of the ball milling process

  6. Financiranje projekata na pomorskom dobru

    Directory of Open Access Journals (Sweden)

    Zoran Tasić

    2018-02-01

    Full Text Available Koncesije otvaraju vrlo osjetljiva politička, ekonomska i pravna pitanja u mnogim državama svijeta. Samo definiranje pojma koncesije često je komplicirana i ne sasvim jasna zadaća. OECD je prihvatila definiciju koncesije kao: ’’davanje prava privatnom trgovačkom društvu da može gospodarski upravljati određenom infrastrukturnim uslugama i za to zarađivati naknadu. Koncesionar dobija u posjed određene objekte (ali vlasništvo na tim objektima ostaje u rukama države te ih koristi u svrhu obavljanja određene djelatnosti ili usluge sukladno odredbama ugovora’’. Hrvatsko pravo definira koncesije načelno kao pravo stečeno temeljem ugovora o koncesiji, a sukladno uvjetima sadržanim u odluci o davanju koncesije (koju je donijelo odgovarajuće upravno tijelo, a u odnosu na pomorsko dobro, specifično, kao pravo državne vlasti da može dio pomorskog dobra, koje je inače dobro izvan pravnog prometa (res extra commercium, isključiti iz opće uporabe bilo dijelom ili u cijelosti, i dati ga fizičkoj ili pravnoj osobi na gospodarsko korištenje sukladno određenim prostornim planovima. Građevine i drugi objekti izgrađeni na pomorskom dobru čine njegov sastavni dio. Zakonom je jasno određeno da nikakva stvarna prava nisu dopuštena na pomorskom dobru, uključivo i na objektima izgrađenima na njemu. Projekti na pomorskom dobru često uključuju velike infrastrukturne projekte, razvoje luka i marina, koji iziskuju značajna financijska sredstva. Banke koje financiraju takve projekte zahtijevaju organiziran i transparentan zakonski okvir koncesija, slobodu ugovaranja, pravnu zaštitu svih strana uključenih u projekt (uključivo i mogućnost međunarodne arbitraže. (...

  7. Recikliranje plastenk na kreativen način

    OpenAIRE

    Pavlin, Suzana

    2017-01-01

    Plastenke, poleg ostalih plastičnih izdelkov, v zadnjih letih predstavljajo pravo katastrofo za okolje. Domnevamo, da se le redko kdo vpraša, kaj se zgodi z njo po tem, ko je iz nje zaužil še zadnjo kapljico vode. Plastenka je lahko kot večina ostalih komunalnih odpadkov ponovno uporabljena, reciklirana, sežgana ali odložena na deponijo. V primeru nespoštovanja Zakona o varstvu okolja pa pristane v naravi, pogosto v morju, kjer prav počasi razpada in negativno vpliva na celoten ekosistem. V d...

  8. Nursing diagnosis: educational strategy based on problem-based learning Diagnóstico de enfermería: estrategia educativa fundamentada en el aprendizaje basado en problemas Diagnóstico de enfermagem: estratégia educativa fundamentada na aprendizagem baseada em problemas

    Directory of Open Access Journals (Sweden)

    Ana Luisa Brandão de Carvalho Lira

    2011-08-01

    Full Text Available This study aimed to evaluate the effectiveness of a teaching strategy on nursing diagnoses based on problem-based learning in the performance of clinical reasoning and diagnostic trial of undergraduate students. Experimental study conducted in two phases: content validation of problems and implementation of educational strategy. The results showed improvement in the data pooling ability of students in the experimental group. It is concluded that the strategy put in practice exerted a positive influence.Este estudio tuvo por objetivo evaluar la eficacia de una estrategia de enseñanza sobre diagnósticos de enfermería fundamentada en el aprendizaje basado en problemas en el desempeño del raciocinio clínico y juzgamiento diagnóstico de los estudiantes de graduación. Se trata de estudio experimental, realizado en dos fases: validación de contenido de los problemas y aplicación de la estrategia educativa. Los resultados mostraron mejoría en la capacidad de agrupamiento de los datos de los estudiantes del grupo experimental. Se concluye que hubo influencia positiva de la estrategia implementada.Este estudo teve por objetivo avaliar a eficácia de uma estratégia de ensino sobre diagnósticos de enfermagem, fundamentada na aprendizagem, baseada em problemas no desempenho do raciocínio clínico e julgamento diagnóstico dos discentes de graduação. É estudo experimental, realizado em duas fases: validação de conteúdo dos problemas e aplicação da estratégia educativa. Os resultados mostraram melhora na capacidade de agrupamento dos dados dos discentes do grupo experimental. Conclui-se que houve influência positiva da estratégia implementada.

  9. All new for NA62

    CERN Multimedia

    Antonella Del Rosso

    2012-01-01

    This week sees the start of the first run of the new NA62 experiment. This will be a unique opportunity for the collaboration to test its new beam, new detectors and new data acquisition system before the physics run in 2014. Speaking to the Bulletin, the NA62 technical coordinator Ferdinand Hahn shares the many challenges that the various teams faced to be on time for beam. Ready, steady, start!   A Large Angle Veto detector (white) in place in the NA62 decay volume (blue). With components from almost all the detectors in place downstream of the decay point of the mother particles – the kaons – and of the KTAG detector that tags the kaons before they decay, NA62 is ready for its first technical run. This unique run will test all the equipment as well as the trigger and the data acquisition systems. “This year, we will have about five weeks of beam from the SPS before the long shutdown of all the CERN machines,” says Ferdinand Hahn, NA62 Technical Co-...

  10. Corpo e sexualidade na gravidez

    Directory of Open Access Journals (Sweden)

    Natalúcia Matos Araújo

    2012-06-01

    Full Text Available Estudo etnográfico que teve como objetivo compreender como as gestantes vivenciam os processos fisiológicos do seu corpo durante a gestação e a sua repercussão na sexualidade. A pesquisa envolveu sete mulheres residentes em bairro popular de São Paulo. Na coleta de dados, utilizou-se observação participante e entrevista com questões norteadoras. Os dados foram apresentados na forma de narrativa e posteriormente organizados nas categorias: Percebendo as transformações corporais; Convivendo com as mudanças no corpo; Sentimentos e sensações na vida sexual durante a gestação e imaginando o corpo e a sexualidade após a gestação. As mulheres referiram-se às transformações do corpo como desconfortos e expressaram a preocupação de que fossem definitivas. Expressaram o desejo de que, após o parto, o corpo volte a ser como era e que volte a sentir desejo sexual. O reconhecimento destes fatos constitui-se numa ferramenta primordial na adequação das práticas profissionais.

  11. Critérios para aplicação de ABC (Activity Based Costing na indústria naval Criteria for applying Activity Based Costing (ABC in the naval construction industry

    Directory of Open Access Journals (Sweden)

    Nélio Achão Filho

    2003-01-01

    Full Text Available O presente trabalho tem por objetivo conceituar o que é ABC (Activity Based Costing e apresentar, de forma sistemática, uma sugestão de critérios para aplicação em empresa de construção naval. Basicamente, o estudo pretende contribuir, através do efeito demonstração do estudo de caso, para a conscientização quanto as dificuldades e oportunidades oferecidas pela implementação de um sistema ABC, numa área carente de novas metodologias gerenciais.The objective of this article is to evaluate what ABC (Activity Based Costing is, and to present, in a systematic form, a suggestion for the implantation of criteria for aplication at a naval construction company. Basically, the study intends, through the case study demo, make executives aware of the dificulties and oportunities offered by the implementation of an ABC system, in an area in need of new managerial methods.

  12. Behaviour of semiconductor nuclear-particle detectors; Comportement des semi-conducteurs comme detecteurs de particules nucleaires; Povedenie detektorov yadernykh chastits na poluprovodnikakh; Propiedades de los detectores de particulas nucleares a base de semiconductores

    Energy Technology Data Exchange (ETDEWEB)

    Walter, F J; Dabbs, J W.T.; Roberts, L D [Oak Ridge National Laboratory, Oak Ridge, TN (United States)

    1962-04-15

    asegurar una coleccion completa, el campo minimo necesario (en la superficie) para los fragmentos de fision seria de mas de 3 {center_dot} 10{sup 4} V/cm, frente a 2 {center_dot} 10{sup 3} V/cm para las particulas alfa en el Ge y el Si. Un estudio detallado del tiempo de elevacion del impulso en el amplificador ha puesto en claro que tanto el tiempo de relajacion como la resistencia correspondiente al material de base no purificado pueden desempenar un papel muy importante en los materiales de elevada resistividad. La memoria presenta una descripcion cuantitativa del efecto de los parametros del detector y del amplificador sobre la forma y el tiempo de elevacion de los impulsos. Se discuten las ventajas y los problemas que presenta la utilizacion de detectores de barrera superficial en varios experimentos muy especiales de alineacion nuclear realizados a baja temperatura, entre otros, referentes a las distribuciones angulares de fragmentos de fision y a la resolucion de la estructura alfa fina con estabilidad a largo plazo. Tambien se describen tecnicas de fabricacion basadas en coeficientes de dilatacion equiparados, que han permitido obtener detectores con areas activas de hasta 8 cm{sup 2}. (author) [Russian] Byli provedeny ehksperimental'nye i teoreticheskie issledovaniya povedeniya detektorov yadernykh chastits na poluprovodnikakh pri temperaturakh ot 0,2{sup o}K do 300{sup o}K. V doklade privoditsya prostaya teoreticheskaya model' povedeniya detektora, kotoraya, kak bylo ustanovleno, otrazhaet nablyudaemoe povedenie pri bol'shoj amplitude parametrov. V doklade obsuzhdaetsya vazhnost' chistoty poluprovodnikov i smeshcheniya napryazheniya v svyazi s amplitudoj impul'sa, vremenem narastaniya impul'sa i zonoj detektsii. EHmpiricheski issledovaniya shuma i ehnergeticheskogo razresheniya svidetel'stvuyut o tom, chto dlya al'fa-chastits nablyudaemaya naimen'shaya shirina pikov znachitel'no bol'she, chem ta, kotoraya ozhidaetsya na osnove ehlektricheskogo shuma

  13. Análise Bioestratigráfica com Base em Foraminíferos de Três Testemunhos da Região do Leque Almirante Câmara na Bacia de Campos, RJ.

    Directory of Open Access Journals (Sweden)

    David Bentes

    2007-07-01

    Full Text Available A Bacia de Campos é a principal áreaprodutora de hidrocarbonetos do país. A descobertade campos gigantes nessa bacia levou à intensificaçãodos estudos dos depósitos em águas profundas ehiperprofundas, tanto da dinâmica de sua gênese eevolução, quanto da tecnologia de produção. Assim,o estudo da bioestratigrafia do Quaternário dessabacia adquire importância, pois fornece uma molduraestratigráfica para a reconstituição da sedimentaçãonessa área. O objetivo do presente trabalho consisteno reconhecimento de biozonas com base emforaminíferos e na correlação estratigráfica de poçosperfurados no talude continental. O material estudadoé proveniente de três testemunhos coletados em2001, no Sistema Almirante Câmara (lâmina d’águaentre 1050 e 2400 m, pelo projeto “ImageamentoGeofísico do Sistema Turbidítico Moderno em ÁguasProfundas da Bacia de Campos”, desenvolvidopelo Depto. de Geologia/UFRJ em parceria com aPETROBRAS. Foram analisadas 77 amostras, comespaçamento de 3cm a 30cm, de acordo com critérioslitológicos e com a necessidade de um detalhamentomaior dos intervalos estudados. Em laboratório, asamostras foram pesadas (10 g e processadas segundometodologia tradicional para estudo de microfósseiscalcários. Em seguida, cada amostra foi peneiradaa seco para triagem, identificação e contagem. Aidentificação e classificação taxônomica seguiuBolli & Saunders (1985. In: Bolli et al. PlanktonStratigraphy e Kennet & Srinivasan (1983. NeogenePlanktonic Foraminifera: a Phylogenetic Atlas. Obiozoneamento utlizado como referência foi o deEricson & Wollin (1968. Sciences, v.162, refinadopor Vicalvi (1997, Bol.Geoci.Petrobras, v.11, n.1/2;1999. PPGG/UFRJ,Tese D.Sc.. Foram reconhecidasas biozonas Z (Holoceno, Y e X (Pleistoceno Finale identificado um possível hiato, englobando ointervalo Y5 – Y2; as taxas de sedimentação foramcalculadas para os intervalos Z, parte superior de Y1e Y1 total.

  14. gigapanorama of NA 62 cavern

    CERN Multimedia

    Brice, Maximilien

    2015-01-01

    The image shows the new rare Kaon decay experiment at CERN, called NA62. The NA62 experiment is 270 metres long and includes a 120-metre-long vacuum tank, shown here, housing several of the particle detectors. (Note: the experiment axis is a straight line, the curving of the tank is an optical effect of the photo.) Kaons are particles that decay into lighter elementary particles. The kaon decay processes are mostly well known, except for some very rare decay modes. For example, NA62 is investigating a rare decay predicted by the Standard Model in which a kaon decays into one pion and two neutrinos. This process occurs only once every 10 billion decays. The understanding of such ultra-rare decays are of great importance because they test the Standard Model in energy ranges not accessible by direct measurements. They are therefore complementary to the measurements at the LHC. ultra high definition on demand (photolab@cern.ch).

  15. Armas na escola: que fazer?

    Directory of Open Access Journals (Sweden)

    Raymundo de Lima

    2010-09-01

    Full Text Available

    Um aluno portava um revólver na sala de aula de uma escola de Maringá (O Diário, 30/07/2010. Ele pegou arma do pai, sem que este soubesse, para se proteger de garotos que o intimidavam. Trata-se de um caso isolado ou é hora de a escola tomar medidas preventivas? Semanas antes, tiros foram disparados dentro de uma faculdade da mesma cidade. O autor dos disparos está preso, e a faculdade tenta apagar as marcas com publicidade positiva na Tv. Em Campo Mourão, cidade a cerca de uma hora de Maringá, duas meninas foram mortas e enterradas na escola.

  16. OGLAŠEVANJE NA FACEBOOKU

    OpenAIRE

    Renko, Katica

    2013-01-01

    V magistrskem delu smo se seznanili z oglaševanjem na Facebooku. S pregledom gradiva, ki nam je ponujeno, smo preverili pogoje, načine, oblike … oglaševanja, ki pa smo jih s pregledom situacije v praksi preverili in dopolnili. Ob zaključku dela lahko rečemo, da je oglaševanje preko FB enostavnejše, cenejše, dostopnejše, omogoča nam ažurnost in samo komunikacijo z naslovniki, ki so potencialni kupci naših ponudb. Množični mediji nam omogočajo mnogotero obliko oglaševanja. Izbrana oblika ponuja...

  17. Development of Network Interface Cards for TRIDAQ systems with the NaNet framework

    International Nuclear Information System (INIS)

    Ammendola, R.; Biagioni, A.; Cretaro, P.; Frezza, O.; Cicero, F. Lo; Lonardo, A.; Martinelli, M.; Paolucci, P.S.; Pastorelli, E.; Simula, F.; Valente, P.; Vicini, P.; Lorenzo, S. Di; Piandani, R.; Pontisso, L.; Sozzi, M.; Fiorini, M.; Neri, I.; Lamanna, G.; Rossetti, D.

    2017-01-01

    NaNet is a framework for the development of FPGA-based PCI Express (PCIe) Network Interface Cards (NICs) with real-time data transport architecture that can be effectively employed in TRIDAQ systems. Key features of the architecture are the flexibility in the configuration of the number and kind of the I/O channels, the hardware offloading of the network protocol stack, the stream processing capability, and the zero-copy CPU and GPU Remote Direct Memory Access (RDMA). Three NIC designs have been developed with the NaNet framework: NaNet-1 and NaNet-10 for the CERN NA62 low level trigger and NaNet 3 for the KM3NeT-IT underwater neutrino telescope DAQ system. We will focus our description on the NaNet-10 design, as it is the most complete of the three in terms of capabilities and integrated IPs of the framework.

  18. Standardized precipitation index based on pearson type III distribution Índice padronizado de precipitação baseado na distribuição pearson tipo III

    Directory of Open Access Journals (Sweden)

    Gabriel Constantino Blain

    2011-06-01

    localidades do Estado de São Paulo, nas escalas de 1, 3 e 6 meses. Aplicando testes de aderência, tanto qualitativos, quanto quantitativos, verificou-se que as probabilidades associadas às séries utilizadas foram melhores estimadas por meio da PE3. Foi também observado, que o número de séries temporais do IPP que podem ser consideradas normalmente distribuídas, foi maior quando este índice de seca foi calculado com base na PE3. Dessa forma, recomenda-se a adoção da PE3 no cálculo do IPP no Estado de São Paulo.

  19. β decay of Na32

    Science.gov (United States)

    Mattoon, C. M.; Sarazin, F.; Hackman, G.; Cunningham, E. S.; Austin, R. A. E.; Ball, G. C.; Chakrawarthy, R. S.; Finlay, P.; Garrett, P. E.; Grinyer, G. F.; Hyland, B.; Koopmans, K. A.; Leslie, J. R.; Phillips, A. A.; Schumaker, M. A.; Scraggs, H. C.; Schwarzenberg, J.; Smith, M. B.; Svensson, C. E.; Waddington, J. C.; Walker, P. M.; Washbrook, B.; Zganjar, E.

    2007-01-01

    The β-decay of Na32 has been studied using β-γ coincidences. New transitions and levels are tentatively placed in the level scheme of Mg32 from an analysis of γ-γ and β-γ-γ coincidences. The observation of the indirect feeding of the 2321 keV state in Mg32 removes some restrictions previously placed on the spin assignment for this state. No evidence of a state at 2117 keV in Mg32 is found. Previously unobserved weak transitions up to 5.4 MeV were recorded but could not be placed in the decay scheme of Na32.

  20. Corpo-escrita na esquizofrenia

    OpenAIRE

    Bialer, Marina

    2014-01-01

    Este artigo aborda a importância do trabalho de escrita na esquizofrenia. Toma-se como ponto de partida a formulação lacaniana sobre o esquizofrênico como aquele que não tem as funções dos órgãos do seu corpo dadas pelos discursos estabelecidos. A hipótese de que o trabalho sobre a letra pode permitir o tratamento do gozo debordante na esquizofrenia é analisada pelo estudo da obra do escritor esquizofrênico Robert Walser, a qual evidencia a viabilidade da construção de um corpo pela escrita n...

  1. Sustentabilidade de empresas de base florestal: o papel dos projetos sociais na inclusão das comunidades locais Sustainability of florest based enterprises: the role of social projects in the inclusion of the local communities

    Directory of Open Access Journals (Sweden)

    Antônio do Nascimento Gomes

    2006-12-01

    Full Text Available A partir de estudo de casos, buscou-se interpretar as ações sociais de empresas produtoras de celulose de fibra curta de mercado, localizadas no Estado do Espírito Santo e extremo sul da Bahia, com vistas a verificar a sua consistência com a estratégia de sustentabilidade empresarial. Buscou-se, também, caracterizar seus programas de ações sociais e sua abrangência, ao analisar o conteúdo dos instrumentos de divulgação das ações sociais das empresas e identificar a concepção que tem orientado essas ações sociais e sua relação com as comunidades influenciadas pelas suas áreas de produção de eucalipto.The objective of this study was to interpret, based on case studies, the social actions of short fiber market pulp companies, located in the States of Espírito Santo and extreme South of Bahia, in order to verify their consistency with the strategy of business sustainability; to characterize their programs of social actions and their scope, by analyzing the content of the communication tools of these companies' social actions, and to identify the conception that has guided their social actions and the relationship with the communities influenced by their areas of eucalyptus production.

  2. Níveis de lisina, com base no conceito de proteína ideal, em rações para alevinos de tilápia-do-nilo Lysine levels, based on the ideal protein concept, in diets for Nile tilapia fingerlings

    Directory of Open Access Journals (Sweden)

    Marcos Antonio Delmondes Bomfim

    2010-01-01

    Full Text Available Avaliaram-se os efeitos dos níveis de lisina digestível da ração, com base no conceito de proteína ideal, no desempenho de alevinos de de tilápia-do-nilo (Oreochromis niloticus. Utilizaram-se 432 alevinos revertidos, linhagem tailandesa, com peso inicial de 1,12 ± 0,02 g, em delineamento inteiramente ao acaso, composto de 6 dietas, 6 repetições e 12 peixes por unidade experimental. Como tratamentos, avaliaram-se uma dieta basal com 29,12% de proteína bruta e 3.000 kcal de energia digestível/kg, suplementada com aminoácidos sintéticos, resultando em dietas com 0,95; 1,10; 1,25; 1,40; 1,55 e 1,70% de lisina digestível e relações mínimas entre metionina + cistina, treonina, triptofano, isoleucina e arginina com a lisina (66, 77, 23, 64 e 85%, respectivamente, com base em valores digestíveis. Os peixes foram mantidos em aquários de 130 litros, dotados de abastecimento de água, temperatura controlada e aeração individual, e alimentados à vontade em seis refeições diárias durante 30 dias. Avaliaram-se os parâmetros de desempenho, a composição corporal, a deposição de proteína e gordura corporais e a eficiência de retenção de nitrogênio dos peixes. A elevação do teor de lisina digestível na ração não influenciou a taxa de sobrevivência e o teor de gordura corporal dos peixes, mas melhorou de forma linear todos os demais parâmetros avaliados, com exceção da eficiência de utilização de lisina e a umidade corporal, que pioraram de forma quadrática e linear, respectivamente. O nível de 1,80% de lisina total (0,600% Mcal de ED e o de 1,70% de lisina digestível (0,567% Mcal de ED proporcionam os melhores resultados de desempenho e características de carcaça de alevinos de tilápia-do-nilo quando se utiliza o conceito de proteína ideal na formulação das rações experimentais.The effects of the digestible lysine level were assessed in feeds for Nile tilapia fingerlings (Oreochromis niloticus, based on

  3. Enhancing Catalyzed Decomposition of Na2CO3 with Co2MnO x Nanowire-Decorated Carbon Fibers for Advanced Na-CO2 Batteries.

    Science.gov (United States)

    Fang, Cong; Luo, Jianmin; Jin, Chengbin; Yuan, Huadong; Sheng, Ouwei; Huang, Hui; Gan, Yongping; Xia, Yang; Liang, Chu; Zhang, Jun; Zhang, Wenkui; Tao, Xinyong

    2018-05-23

    The metal-CO 2 batteries, especially Na-CO 2 , batteries come into sight owing to their high energy density, ability for CO 2 capture, and the abundance of sodium resource. Besides the sluggish electrochemical reactions at the gas cathodes and the instability of the electrolyte at a high voltage, the final discharge product Na 2 CO 3 is a solid and poor conductor of electricity, which may cause the high overpotential and poor cycle performance for the Na-CO 2 batteries. The promotion of decomposition of Na 2 CO 3 should be an efficient strategy to enhance the electrochemical performance. Here, we design a facile Na 2 CO 3 activation experiment to screen the efficient cathode catalyst for the Na-CO 2 batteries. It is found that the Co 2 MnO x nanowire-decorated carbon fibers (CMO@CF) can promote the Na 2 CO 3 decomposition at the lowest voltage among all these metal oxide-decorated carbon fiber structures. After assembling the Na-CO 2 batteries, the electrodes based on CMO@CF show lower overpotential and better cycling performance compared with the electrodes based on pristine carbon fibers and other metal oxide-modified carbon fibers. We believe this catalyst screening method and the freestanding structure of the CMO@CF electrode may provide an important reference for the development of advanced Na-CO 2 batteries.

  4. Intervenção de base comunitária para a prevenção das DST/Aids na região amazônica, Brasil Community-based intervention to control STD/AIDS in the Amazon region, Brazil

    Directory of Open Access Journals (Sweden)

    Adele Schwartz Benzaken

    2007-12-01

    Full Text Available OBJETIVO: Descrever estudo de caso de intervenção de base comunitária, desenvolvido na perspectiva construcionista-emancipatória, para o controle das DST/Aids. MÉTODOS: Estudo descritivo desenvolvido no município de Manacapuru, Amazonas, de 1997-2004, sobre a utilização de procedimentos desenhados em colaboração com agentes governamentais, profissionais de saúde e comunidade. Foram levantados dados sobre a dinâmica da prostituição e a venda de preservativos na cidade, características comportamentais, avaliação do processo e da assistência às DST/Aids. Sincronicamente, estabeleceram-se ações de prevenção e assistência na rede pública de saúde às DST, centro de testagem, sistema de vigilância epidemiológica, e capacitação de trabalhadoras do sexo. RESULTADOS: Observou-se o fortalecimento das trabalhadoras do sexo como multiplicadoras e sua legitimação como cidadãs e agentes de saúde em projetos com travestis, homossexuais e escolares. Houve incremento da venda de preservativos na cidade, da utilização de preservativos entre trabalhadoras do sexo, redução das DST bacterianas e estabilização da ocorrência de infecção pelo HIV/Aids e sífilis congênita. A sustentabilidade do programa de intervenção estudado, organizado no âmbito do Sistema Único de Saude, foi estimulada pela pactuação política garantindo sede e orçamento regulamentado em lei municipal, e pelo debate permanente dos resultados do processo e programa. CONCLUSÕES: O estudo fortaleceu a noção de que o controle efetivo das DST/Aids depende de uma abordagem sinérgica que combine intervenções no plano individual (biológica-comportamental, sociocultural e programático.OBJECTIVE: To describe a case study of community-based intervention, developed in a constructionist-emancipatory framework to control STD/AIDS. METHODS: Descriptive study developed in the town of Manacapuru, in the state of Amazonas, from 1997 to 2004, focusing on

  5. Trabalhando com estratégias de ensino-aprendizado por descoberta na área da saúde: a problematização e a aprendizagem baseada em problemas Discovery-based teaching and learning strategies in health: problematization and problem-based learning

    Directory of Open Access Journals (Sweden)

    Eliana Goldfarb Cyrino

    2004-06-01

    Full Text Available Considerando os processos de mudança no ensino em saúde e a demanda por novas formas de trabalhar com o conhecimento no ensino superior, discutem-se dois caminhos metodológicos inovadores no ensino na área da saúde: a aprendizagem baseada em problemas (ABP e a problematização. Descrevendo suas raízes teóricas, procura-se identificar os seus princípios orientadores. Enquanto propostas distintas, ambas contribuem para rever o processo de ensino-aprendizagem: a problematização, voltando-se para a construção do conhecimento no contexto de uma formação crítica; a ABP, voltando-se para os aspectos cognitivos do processo de construção de conceitos e apropriação dos mecanismos básicos da ciência. Tanto a problematização como a ABP levam a rupturas com a forma tradicional de ensinar e aprender, estimulando gestão participativa dos protagonistas da experiência e reorganização da relação teoria/prática. A crítica às possibilidades e limites de cada proposta, valendo-se da análise de seus fundamentos teórico-metodológicos, leva-nos a concluir que experiências pedagógicas apoiadas na ABP e/ou na problematização, podem representar um movimento inovador no contexto da educação na área da saúde favorecendo rupturas e processos mais amplos de mudança.Considering the changes in teaching in the health field and the demand for new ways of dealing with knowledge in higher learning, the article discusses two innovative methodological approaches: problem-based learning (PBL and problematization. Describing the two methods' theoretical roots, the article attempts to identify their main foundations. As distinct proposals, both contribute to a review of the teaching and learning process: problematization, focused on knowledge construction in the context of the formation of a critical awareness; PBL, focused on cognitive aspects in the construction of concepts and appropriation of basic mechanisms in science. Both

  6. Band gap modification and ferroelectric properties of Bi{sub 0.5}(Na,K){sub 0.5}TiO{sub 3}-based by Li substitution

    Energy Technology Data Exchange (ETDEWEB)

    Quan, Ngo Duc [Department of General Physics, School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi (Viet Nam); International Training Institute for Materials Science, Hanoi University of Science and Technology, 1 Dai Co Viet road, Hanoi (Viet Nam); Hung, Vu Ngoc [International Training Institute for Materials Science, Hanoi University of Science and Technology, 1 Dai Co Viet road, Hanoi (Viet Nam); Quyet, Nguyen Van [Hanautech Co., Ltd., 832, Tamnip-dong, Yuseong-gu, Daejeon (Korea, Republic of); Chung, Hoang Vu [Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet street, Hanoi (Viet Nam); Dung, Dang Duc, E-mail: dung.dangduc@hust.edu.vn [Department of General Physics, School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi (Viet Nam)

    2014-01-15

    We report on the reduction of band gap in Bi{sub 0.5}(Na{sub 0.82-x}Li{sub x}K{sub 0.18}){sub 0.5}(Ti{sub 0.95}Sn{sub 0.05})O{sub 3} from 2.99 eV to 2.84 eV due to the substitutions of Li{sup +} ions to Na{sup +} sites. In addition, the lithium substitution samples exhibit an increasing of the maximal polarizations from 21.8 to 25.7 μC/cm{sup 2}. The polarization enhancement of ferroelectric and reduction of the band gaps are strongly related to the Li substitution concentration as evaluated via the electronegative between A-site and oxygen and tolerance factor. The results are promising for photovoltaic and photocatalytic applications.

  7. Construction of scientific production indicators based on scientometrics analysis of IPEN dissertations and theses; Elaboracao de indicadores de producao cientifica com base na analise cientometrica das dissertacoes e teses do IPEN

    Energy Technology Data Exchange (ETDEWEB)

    Igami, Mery Piedad Zamudio

    2011-07-01

    Construction of Indicators plays an important role in the contemporaneous society. It could be observed their ordinary use by all the activities segments. In scientific area it is not different; such practice has already been consolidated; this statement could be corroborated by the innumerous papers published about this matter in the main databases; however, there is a prevalence of quantitative studies, which obtain data from the international databases, analyzing journal articles. Concerning this finding, the main objective of this study was to elaborate scientific indicators from a local institutional data base, using as a corpus of the study the dissertations and theses, produced by a graduate program in the period of 1977 to 2009.Three types of two-dimensional indicators were obtained by using bibliometric techniques: numerical, thematic and productivity. For dissertations and theses thematic characterization it was used the Subject categories and scope descriptions and the International Nuclear Information System Thesaurus (INIS). Through the statistical technique of clustering analysis, it was possible to classify them in five main groups, showing former performance and growth future trends of each group; for data extraction about theses productivity, regarding articles published; the Curriculo Lattes, and the local institutional database were used. Co-word analysis technique was used to establish a more precise correlation, between articles and theses, and for this purpose it was used the keywords from a controlled vocabulary. In order to validate the results, it was performed a survey, with the theses authors. Results obtained indicated that 55.9% of the articles published, between 5 years, before and after the thesis presentation, are strongly correlated to it. It was also observed that, correlated articles have been published, in an average of, 1, 63 year before the thesis presentation. Concerning databases, it was shown that they are valuable tools and

  8. Meltability in system of K2TaF7-NaF-NaCl-KCl

    International Nuclear Information System (INIS)

    Kartsev, V.E.; Kovalev, F.V.; Korshunov, B.G.

    1975-01-01

    Thermographic and visual-polythermal techniques were used to study the meltability in K 2 TaF 7 -NaF-NaCl-KCl system. The tetrahedron-forming sections NaF-NaCl-K 2 TaF 7 xKCl and NaF-K 2 TaF 7 xKCl-2K 2 TaF 7 xNaCl divide the concentration tetrahedron into three particular tetrahedra: NaF-K 2 TaF 7 xKCl-2K 2 TaF 7 xNaCl-K 2 TaF 7 , NaF-NaCl-K 2 TaF 7 xKCl-2K 2 TaF 7 xaCl, and NaF-NaCl-KCl-K 2 TaF 7 xKCl. Non-variant equilibrium points in all of the particular four-component systems have been determined

  9. The crystallization behaviour and bioactivity of wollastonite glass-ceramic based on Na2O–K2O–CaO–SiO2–F glass system

    Directory of Open Access Journals (Sweden)

    S.M. Salman

    2015-09-01

    Full Text Available The study concerns about the crystallization behaviour and in vitro bioactivity of a glass-ceramic prepared from a series of glasses in the Na2O–K2O–CaO–SiO2–F system. A minor amount of cerium oxide was also added instead of calcium oxide in some selective glass batches. The main crystalline phases, formed after the appropriate heat treatments, were wollastonite solid solution and pseudo-wollastonite-like phases. There is a preferential tendency for wollastonite (CaSiO3 to accommodate K, Na, F, and Ce ions in its structure forming wollastonite solid solution with variable formulas. The bioactivity of the resulting crystalline materials was examined in vitro by immersion in simulated body fluid at 37 °C. An increase of the surface bioactivity of glass-ceramic with the Na2O/K2O replacement was observed which is attributed to the augmentation solubility of the crystalline sample. On the other hand, the bioactivity of the crystalline sample with CeO2/CaO replacement was improved by the crystallization of pseudo-wollastonite phase together with wollastonite solid solution phase.

  10. Study of the influence of zirconium and gallium on the magnetic properties and microstructures of praseodymium-based permanent magnets; Estudo da influencia do zirconio e galio nas propriedades magneticas e na microestrutura dos imas permanentes a base de praseodimio

    Energy Technology Data Exchange (ETDEWEB)

    Fusco, Alexandre Giardini

    2006-07-01

    In this work was studied the influence of the addition of 0.5 at. % of zirconium and gallium on praseodymium-based HD sintered magnets obtained using a mixture of alloys. The alloys used in this study were: Pr{sub 12.6}Fe{sub 68.3}Co{sub 11.6}B{sub 6}Zr{sub 0.5}Ga{sub 1}, Pr{sub 16}Fe{sub 75.5}B{sub 8}Zr{sub 0.5}, Pr{sub 13}Fe{sub 80.5}B{sub 6}Zr{sub 0.5}. The investigation started by measuring the magnetic properties and observing the microstructure of the magnets. After that, the magnets were annealed at 1000 deg C for 2 hours followed by rapid cooling, in a total of 10 hours. This heat treatment was followed by 5 hours at the same temperature up to a total of 35 hours. Changes in the microstructure were compared to the change in the magnetic properties aiming at a proper understanding of the role of each added element in relation to the magnetically hard phase (phase {phi}). It has been shown that gallium and zirconium act as grain refiners of the matrix phase {phi}. Gallium acts in the grain and favoring of the shape stability and improvement of the magnetic properties. For the Pr{sub 14.3}Fe{sub 71.9}Co{sub 5.8}B{sub 7}Zr{sub 0.5}Ga{sub 0.5} sintered magnet the evolution of the magnetic properties after 15 hours heat treatment was: remanence from (1.25{+-}0.02) T to (1.30{+-}0.02) T, intrinsic coercivity from (1.11{+-}0.02) T to (0.87{+-}0.02) T, squareness factor from (0.68{+-}0.02) to (0.82{+-}0.02) and energy product from (285{+-}5) kJ/m{sup 3} to (317{+-}5) kJ/m{sup 3}. Zirconium has two effects on the sintered magnets. Firstly, avoiding random grain growth and enhancing anisotropy. However, by concentrating on the grain boundaries, yield reverse domains and is detrimental to the intrinsic coercivity. For the sintered Pr{sub 14.5}Fe{sub 78}B{sub 7}Zr{sub 0.5} magnet the evolution of the magnetic properties achieved after a heat treatment of 15 hours was: remanence from (1.19{+-}0.02) T to (1.25{+-}0.02) T, coercivity from (0.74{+-}0.02) T to (0

  11. NA60 frees the quarks

    CERN Multimedia

    2003-01-01

    Fitted with new state-of-the-art silicon detectors, NA60 is prepared to study the phase transition from confined hadronic matter to a deconfined (free) quark-gluon plasma, a state of matter which probably existed an instant after the Big Bang.

  12. NA61/SHINE ion program

    CERN Document Server

    Mackowiak, Maja

    2010-01-01

    The Super Proton Synchrotron (SPS) at CERN covers one of the most interesting regions of the phase diagram (T - \\mu_{B}) of strongly interacting matter. The study of central Pb+Pb collisions by NA49 indicate that the threshold for deconfinement is reached already at the low SPS energies. Theoretical considerations predict a critical point of strongly interacting matter at energies accessible at the SPS. The NA61/SHINE experiment, a successor of the NA49 project, will study hadron production in p+p, p+A, h+A, and A+A reactions at various energies. The broad physics program includes the investigation of the properties of strongly interacting matter, as well as precision measurements of hadron spectra for the T2K neutrino experiment and for the Pierre Auger Observatory and KASCADE cosmic-ray projects. The main physics goals of the NA61/SHINE ion program are to study the properties of the onset of deconfinement at low SPS energies and to find signatures of the critical point of strongly interacting matter. To ach...

  13. NA62: Hidden Sector Physics

    CERN Document Server

    Cesarotti, Carissa Joyce

    2016-01-01

    Modern experimental physics is often probing for new physics by either finding deviations from predictions on extremely precise measurements, or by looking for a new signal that cannot be explained with existing models. The NA62 experiment at CERN does the former by measuring the ultra-rare decay $K^+ \\rightarrow \\pi^+ \

  14. The system NaVO3-Na2WO4-Na2W2O7

    International Nuclear Information System (INIS)

    Kazanbekov, V.R.; Gasanaliev, A.M.; Kazanbekov, R.G.

    1994-01-01

    Phase diagrams of sodium metavanadate-sodium ditungstate, sodium metavanadate-sodium tungstate systems and surface of primary crystallization of sodium metavabadate-sodium tungstate-sodium ditungstate system were studied. The system sodium metavanadate-sodium ditungstate is eutectic one. Compound NaVO 3 x2Na 2 WO 4 is formed in solid state in sodium metavanadate-sodium tungstate system. Liquidus surface of sodium metavanadate-sodium tungstate-sodium ditungstate is presented by three crystallization fields of initial components. Composition and melting point of ternary eutectics are determined

  15. Analysis of the role of business incubator in internationalization of basic technology companies Análise do papel da incubadora na internacionalização de empresas de base tecnológica, incubadas e graduadas

    Directory of Open Access Journals (Sweden)

    Gabriela Gonçalves Silveira Fiates

    2013-05-01

    se constituem em ambientes potencializadores de redes de relacionamento, tanto entre as empresas incubadas e graduadas, como com agentes externos. E, finalmente, a terceira premissa é que a inovação é uma vantagem competitiva que alavanca o processo de internacionalização de empresas e mostra-se fundamental para o desempenho competitivo da empresa no mercado externo. A pesquisa a partir de casos de pequenas empresas de base tecnológica mostra-se relevante dada a necessidade do Brasil de estimular a inserção externa de empresas que comercializam produtos intensivos em tecnologia. A pesquisa é de caráter descritivo, na forma de um estudo multicaso com seis empresas, três incubadas e três graduadas. Os resultados apontam que a inovação configura-se realmente como a principal vantagem para a competição em mercados internacionais. De forma intencional e planejada, há uma aceleração do processo de internacionalização nas empresas mais jovens, já concebidas com uma visão global. Constatou-se que a incubadora favorece a formação de redes de relacionamento que estimulam a inovação e a interação com outros atores que podem fomentar o processo de internacionalização, no entanto, não há ações percebidas pelos empresários próprias para esta finalidade, o que aponta para uma oportunidade de ação sistemática das incubadoras no apoio à internacionalização de empresas.

  16. ANÁLISE DE AÇÕES EXTENSIONISTAS NA IMPLANTAÇÃO DE HORTAS ESCOLARES DE BASE ECOLÓGICA, SEUS EFEITOS E DESAFIOS NO CONTEXTO EDUCACIONAL

    Directory of Open Access Journals (Sweden)

    José Tobias Marks Machado

    2015-12-01

    Full Text Available Resumo: Tratando-se de um contexto educacional com vistas ao aprimoramento dos processos de ensino que venham a contribuir na formação de indivíduos com pensamento crítico e consciência social, abordar temas relacionados à questão ambiental e educação alimentar torna-se fundamental. Nesse sentido, via extensão universitária, no decorrer do ano de 2013 desenvolveu-se em duas escolas do município de Cerro Largo - RS a implantação de hortas escolares, utilizando como método de trabalho discussões teóricas no âmbito da agroecologia e alimentação saudável, bem como ações práticas de participação cooperativa de construção das hortas, objetivando a internalização da experiência no processo educativo. O presente trabalho tem como objetivo discorrer sobre a experiência fazendo a análise pós-execução, apontando as dificuldades encontradas, resultados positivos e suas possíveis condicionantes. Como resultado positivo, nota-se a multiplicação de projetos similares. Tratando-se das dificuldades encontradas dá-se ênfase aos desafios na integração com a formação disciplinar, considerando o conservadorismo ainda existente no contexto educacional. Palavras-chave: Educação Alimentar, Segurança Alimentar, Agroecologia, Extensão Universitária.   The analysis of extension actions regarding the implementation of school gardens of ecological basis: its effects and challenges in the educational context Abstract: When taking into consideration an educational context that aims at improving the learning processes that can contribute to the education of individuals with critical thinking and social awareness, It is critical to address topics related to environmental and food education. In this sense, the implementation of school gardens by means of a university extension program during 2013 was developed in two schools in the city of Cerro Largo - RS by fostering theoretical discussions related  to agroecology and healthy

  17. Mechanisms of the Regulation of the Intestinal Na+/H+ Exchanger NHE3

    Directory of Open Access Journals (Sweden)

    Peijian He

    2010-01-01

    Full Text Available A major of Na+ absorptive process in the proximal part of intestine and kidney is electroneutral exchange of Na+ and H+ by Na+/H+ exchanger type 3 (NHE3. During the past decade, significant advance has been achieved in the mechanisms of NHE3 regulation. A bulk of the current knowledge on Na+/H+ exchanger regulation is based on heterologous expression of mammalian Na+/H+ exchangers in Na+/H+ exchanger deficient fibroblasts, renal epithelial, and intestinal epithelial cells. Based on the reductionist's approach, an understanding of NHE3 regulation has been greatly advanced. More recently, confirmations of in vitro studies have been made using animals deficient in one or more proteins but in some cases unexpected findings have emerged. The purpose of this paper is to provide a brief overview of recent progress in the regulation and functions of NHE3 present in the luminal membrane of the intestinal tract.

  18. Contribuições para a evolução do gerenciamento de resíduos sólidos urbanos no Brasil com base na experiência Européia

    Directory of Open Access Journals (Sweden)

    Camille Ferreira Mannarino

    Full Text Available RESUMO: Esse trabalho tem como objetivo apresentar dados relevantes sobre o gerenciamento de resíduos sólidos urbanos (RSU na Europa de forma a se estabelecer paralelos e subsidiar a discussão no Brasil. É apresentada uma contextualização da situação atual da gestão dos resíduos sólidos urbanos no Brasil, onde os efeitos da Política Nacional de Resíduos Sólidos já se fazem sentir, sobretudo com o aumento da disposição final de RSU em aterros sanitários, predominantemente nas regiões metropolitanas. A reciclagem no país, em grande parte, ainda baseia-se na coleta informal por catadores ou na ação de organizações privadas. Na Europa, a partir da Diretiva 1999/31/EC, que estabeleceu metas para a disposição de resíduos em aterros sanitários, e da Diretiva 94/62/EC, sobre recolhimento de embalagens, a gestão de RSU se alterou profundamente. São apresentados dados das tecnologias predominantes de tratamento e disposição final de RSU e alguns mecanismos para implementação da mudança de cenário na Europa. O exemplo suíço é detalhado, mostrando como a cobrança de tarifas impulsiona as ações da população. É preciso reconhecer que o gerenciamento de resíduos sólidos urbanos RSU tem que ser planejado da coleta até o destino final, utilizando e integrando diferentes tecnologias de tratamento, de acordo com as características locais. É relevante para o Brasil a avaliação criteriosa das soluções disponíveis, do ponto de vista técnico e operacional, considerando fortemente a sua aplicabilidade local.

  19. Wytrzymałość pływacka i biegowa studentów kierunku wychowanie fizyczne na podstawie testu Coopera = Endurance swimming and gear students of physical education based on the basis of the Cooper's test

    Directory of Open Access Journals (Sweden)

    Jan Banach

    2015-05-01

    IKF, WKFZIT, Uniwersytet Kazimierza Wielkiego w Bydgoszczy                           Streszczenie          Wytrzymałość i wydolność można badać różnymi metodami. Na kierunku wychowania fizycznego Uniwersytety Kazimierza Wielkiego podjęto badania metodą  biegowego i pływackiego testu Coopera. Do badań na sali gimnastycznej i na pływalni przystąpiło i ukończyło 59 studentów. Dokonano analizy wyników z podziałem na wyniki kobiet i mężczyzn z wyróżnieniem studentów uprawiających czynnie wybrane dyscypliny sportu. Wynikiem pracy jest stwierdzenie że przebadani  studenci posiadają w znakomitej większość bardzo dobrą i dobrą wytrzymałość. Nie stwierdzono aby studenci czynnie uprawiający wybrane dyscypliny sportowe wyróżniali się wyższą wytrzymałością.   Słowa kluczowe: pływanie, Test pływacki, Test Coopera, wytrzymałość.   Abstract Endurance performance can be investigated by different methods. At the direction of physical education Universities Casimir the Great been investigated by cross-country skiing and swimming Cooper test. To study the gym and the swimming pool has acceded and graduated 59 students. The analysis of the results from the division of the results for men and women with honors students engaged actively chosen sport. The result of work is the finding that students have screened the vast majority of very good and good strength. There were no students to actively cultivating selected sports disciplines distinguished by a higher resistance.   Keywords: swimming, pool Test, Test Cooper endurance.

  20. Pozitivni in negativni vplivi risank na otroke

    OpenAIRE

    Povše, Nika

    2017-01-01

    V tej diplomski nalogi smo raziskovali pozitivne in negativne vplive risank na otroke. Začeli smo z zgodovino televizije, tako svetovno zgodovino kot zgodovino televizije na Slovenskem. Na isti način smo pregledali tudi zgodovino risank. Raziskovali smo otrokov razvoj, predvsem tiste vidike, ki so izpostavljeni vplivom risank, kot so morala, jezik, domišljija in učenje. Sledilo je raziskovanje negativnih in pozitivnih vplivov, ki jih imajo risanke na otroke, kar je tudi naš glavni problem te ...

  1. Possible influences of pacific decadal oscillation in the ten day based radio between actual and potential evapotranspiration in the region of Campinas, São Paulo State, Brazil Possível influência da oscilação decadal do pacífico na razão decendial entre a evapotranspiração real e potencial na região de Campinas (SP, Brasil

    Directory of Open Access Journals (Sweden)

    Gabriel Constantino Blain

    2009-09-01

    Full Text Available Considering the importance of the ratio between the actual and potential evapotranspiration (AE/PE for agricultural purposes, the present study estimated the 10-day based AE/PE, aiming to evaluate possible influences of the Pacific Decadal Oscillation (PDO, on temporal variability series, in the region of Campinas, São Paulo State, Brazil. The shapes of the beta probability density function of the AE/PE series for four periods (two in the cold PDO phase and two in the warm PDO phase do not show differences between the PDO phases. In this sense, the use of "average periods" to obtain a standard climatology for agrometeorological purposes (such as the climate normal of the 1961-1990 period, which encompasses sixteen years of the cold PDO phase and fourteen years of the warm PDO phase should not result in significant errors in the region of Campinas, SP. However, considering academic/scientific purposes, the analyses of the autocorrelation functions of the residual AE/PE series for the four periods show differences in the persistence between the two phases of the PDO.Tendo em vista a importância agrícola da razão entre a evapotranspiração real e potencial (ETR/ETP, estimou-se esta relação (em escala decendial, a fim de verificar possíveis influências da Oscilação Decadal do Pacífico (PDO sobre a variabilidade temporal desse parâmetro agrometeorológico na região de Campinas, Estado de São Paulo, Brasil. Pelas formas da função de densidade de probabilidade Beta das séries de ETR/ETP para quatro períodos (dois na fase fria, e dois na fase quente não se observam diferenças significativas (influência entre as fases da PDO. Nesse aspecto, sob o ponto de vista agrometeorológico, o uso de um determinado "período médio" (tal como a normal climatológica de 1961-1990, que compreende dezesseis anos da fase fria e catorze da fase quente, para caracterização de séries temporais de ETR/ETP, não deve resultar em grandes erros. No

  2. Reflexões sobre as bases conceituais que fundamentam a construção do conhecimento acerca da lombalgia na gestação Reflexiones sobre las bases conceptuales que fundamentan la construcción del conocimiento a cerca de la lumbalgia en el embarazo Low back pain in pregnancy in the perspective of the biomedical model: a critical analysis

    Directory of Open Access Journals (Sweden)

    Cristine Homsi Jorge Ferreira

    2001-05-01

    Full Text Available A lombalgia na gestação acomete cerca de 50% das gestantes, causando importantes transtornos sociais. Apesar disso, ela vem sendo considerada como uma ocorrência normal e até esperada na gravidez, o que tem contribuído para a falta de adoção de medidas profiláticas e de alívio. Buscamos neste trabalho compreender as bases conceituais históricas que originaram esta naturalização, usando como recorte a obstetrícia e como referência a literatura mundial sobre o tema indexada de 1987 à 1997. Apreendemos que a visão determinista relacionada ao problema respalda-se no modelo biomédico. Assim, a adoção de soluções efetivas requer a incorporação de um novo paradigma.La Lumbalgia en la gestación afecta cerca de 50% de las gestantes, causando importantes transtornos sociales. Aun ésta morbilidad es considerada como normal y es esperada durante la gravidez, lo que hay contribuido para la falta de adopción de medidas profilácticas y de alivio. Buscamos en este trabajo comprender las bases conceptuales históricas que originaron ésta concepción, usando como recorte la obstetricia y como referencia la literatura mundial sobre el tema indexada de 1987 a 1997. Aprendimos que la visión determinista relacionada con el problema se respalda en el modelo biomédico. Asi, la adopción de soluciones efectivas requiere la incorporación de un nuevo paradigma.Low back pain is a problem that is faced by 50% of pregnant women and causes important social trouble. In spite of this, the problem is considered to be normal and is expected during pregnancy, which has contributed to the lack of prophylactic and relief measures. This work aims at understanding the historical and conceptual bases that have given rise to such naturalization as outlined by midwifery and by using world literature indexed on the topic from 1987 to 1997 as a theoretical framework. We have apprehended that a deterministic view related to this issue is supported by the

  3. Filmes e coberturas comestíveis compostas à base de amidos nativos e gelatina na conservação e aceitação sensorial de uvas Crimson Films and edible coatings based on native starches and gelatin in the conservation and sensory acceptance of Crimson gra

    Directory of Open Access Journals (Sweden)

    Farayde Matta Fakhouri

    2007-06-01

    Full Text Available Filmes compostos de gelatina com amidos nativos de trigo, sorgo, batata e arroz foram produzidos separadamente e caracterizados quanto às propriedades físico-químicas (solubilidade em água e barreira ao vapor de água, físicas (espessura e opacidade e mecânicas (resistência à tração e porcentagem de elongação na ruptura. As mesmas soluções filmogênicas foram preparadas e aplicadas em uvas Crimson para avaliação sensorial e acompanhamento da perda de massa durante 22 dias. As coberturas de sorgo e arroz foram as mais eficientes na extensão da vida útil (aumento de 10 dias. Entretanto, em relação aos atributos sensoriais, as uvas com cobertura de arroz não diferiram estatisticamente do controle, que apresentou as menores notas para os parâmetros de aparência global e intenção de compra. O filme de sorgo apresentou uma permeabilidade ao vapor de água de 5,40 g.mm.m-2.d.kPa, resistência à tração de 85,89 MPa, elongação de 6,61% e opacidade de 40%. Mesmo não apresentando os melhores valores de caracterização, como filme, tornou-se a melhor opção como cobertura. Na avaliação sensorial, as uvas cobertas obtiveram aceitação igual ou maior que o controle quanto à aparência global, brilho, cor e intenção de compra. Na degustação das uvas, nenhuma das coberturas exerceu influência significativa no aroma, sabor e textura, sendo aceitas pelo consumidor em todos os parâmetros.Films based on gelatin and native starches from wheat, sorghum, potato and rice were produced separately and characterized as to their physical-chemical (water solubility and water vapor permeability, physical (thickness and opacity and mechanical (resistance to traction and percentage elongation at rupture properties. The same solutions were prepared and applied to Crimson grapes for sensory evaluation and determination of weight loss over 22 days. The sorghum and rice coatings were the most efficient in their extending shelf life (a ten

  4. Photodesorption of Na atoms from rough Na surfaces

    DEFF Research Database (Denmark)

    Balzer, Frank; Gerlach, R.; Manson, J.R.

    1997-01-01

    We investigate the desorption of Na atoms from large Na clusters deposited on dielectric surfaces. High-resolution translational energy distributions of the desorbing atoms are determined by three independent methods, two-photon laser-induced fluorescence, as well as single-photon and resonance......-enhanced two-photon ionization techniques. Upon variation of surface temperature and for different substrates (mica vs lithium fluoride) clear non-Maxwellian time-of-flight distributions are observed with a cos θ angular dependence and most probable kinetic energies below that expected of atoms desorbing from...... atoms are scattered by surface vibrations. Recent experiments providing time constants for the decay of the optical excitations in the clusters support this model. The excellent agreement between experiment and theory indicates the importance of both absorption of the laser photons via direct excitation...

  5. Energetics of cobalt phosphate frameworks: α, β, and red NaCoPO4

    International Nuclear Information System (INIS)

    Le, So-Nhu; Eng, Hank W.; Navrotsky, Alexandra

    2006-01-01

    Thermal behavior, relative stability, and enthalpy of formation of α (pink phase), β (blue phase), and red NaCoPO 4 are studied by differential scanning calorimetry, X-ray diffraction, and high-temperature oxide melt drop solution calorimetry. Red NaCoPO 4 with cobalt in trigonal bipyramidal coordination is metastable, irreversibly changing to α NaCoPO 4 at 827 K with an enthalpy of phase transition of -17.4±6.9 kJ mol -1 . α NaCoPO 4 with cobalt in octahedral coordination is the most stable phase at room temperature. It undergoes a reversible phase transition to the β phase (cobalt in tetrahedra) at 1006 K with an enthalpy of phase transition of 17.6±1.3 kJ mol -1 . Enthalpy of formation from oxides of α, β, and red NaCoPO 4 are -349.7±2.3, -332.1±2.5, and -332.3±7.2 kJ mol -1 ; standard enthalpy of formation of α, β, and red NaCoPO 4 are -1547.5±2.7, -1529.9±2.8, and -1530.0±7.3 kJ mol -1 , respectively. The more exothermic enthalpy of formation from oxides of β NaCoPO 4 compared to a structurally related aluminosilicate, NaAlSiO 4 nepheline, results from the stronger acid-base interaction of oxides in β NaCoPO 4 (Na 2 O, CoO, P 2 O 5 ) than in NaAlSiO 4 nepheline (Na 2 O, Al 2 O 3 , SiO 2 ). - Graphical abstract: Relative stability of NaCoPO 4 polymorphs compared to the most stable phase, α NaCoPO 4

  6. Law of Iterated Logarithm for NA Sequences with Non-Identical ...

    Indian Academy of Sciences (India)

    Based on a law of the iterated logarithm for independent random variables sequences, an iterated logarithm theorem for NA sequences with non-identical distributions is obtained. The proof is based on a Kolmogrov-type exponential inequality.

  7. Vpliv konfucija na sodobno izobraževanje na Kitajskem

    Directory of Open Access Journals (Sweden)

    Katja Skitek

    2009-12-01

    Full Text Available Izobraževanje na Kitajskem je bilo vedno trdno povezano s Konfucijem in konfucianizmom, kar pa ni čudno, saj je bil Konfucij prvi, ki je poudarjal moč z nanja in izobraževanja. LR Kitajska je v zadnjih petdesetih letih počasi in postopoma začela uveljavljati določene spremembe v vzgojno-izobraževalni sistem. Kakšne so te spremembe in koliko nanje še vedno vpliva konfucianizem, bo osrednja tema pričujočega članka. Konfucianizem danes na Kitajskem ni preveč popularen, izobraženci pa so se razporedili v dve skupini: eni trdijo, da je njegov vpliv še vedno velik, drugi pa zatrjujejo, da nima več nobenega vpliva na sodobno življenje. Katera stran ima prav? Konfucij je v prvi vrsti poudarjal pomembnost moralnih vrednot vsakega človeka in prav moralne vrednote, za katere se je zavzemal, so še danes trdno zasidrane v kitajski kulturi. Ali je torej sploh mogoče popolnoma izriniti Konfucija iz sodobnega izobraževanja?

  8. Nondestructive analysis of RA reactor fuel burnup, Program for burnup calculation base on relative yield of {sup 106}Ru, {sup 134}Cs and {sup 137}Cs in the irradiated fuel; Nedestruktivno odredjivanje izgaranja goriva reaktora RA, Program za izracunavanje izgaranja na osnovu relativne zastupljenosti {sup 106}Ru, {sup 134}Cs i {sup 137}Cs u ozracenom gorivu

    Energy Technology Data Exchange (ETDEWEB)

    Bulovic, V F [Institute of nuclear sciences Boris Kidric, Vinca, Beograd (Yugoslavia)

    1971-07-01

    Burnup of low enriched metal uranium fuel of the RA reactor is described by two chain reactions. Energy balance and material changes in the fuel are described by systems of differential equations. Numerical integration of these equations is base on the the reactor operation data. Neutron flux and percent of Uranium-235 or more frequently yield of epithermal neutrons in the neutron flux, is determined by iteration from the measured contents of {sup 106}Ru, {sup 134}Cs and {sup 137}Cs in the irradiated fuel. The computer program was written in FORTRAN-IV. Burnup is calculated by using the measured activities of fission products. Burnup results are absolute values. Sagorevanje maloobogacenog uranskog metalnog goriva reaktora RA je opisano dvema lancanim reakcijama. Energetski bilans i materijalne promene u gorivu su opisane sistemima diferencijalnih jednacina. Numericka integracija jednacina se vrsi na osnovu podataka u dinamici rada reaktora. Fluks reaktorskih neutrona i procenat urana-235 ili ucesce epitermalnih neutrona u fluksu, odredjuje se iterativno na osnovu izmerenog sadrzaja {sup 106}Ru, {sup 134}Cs i {sup 137}Cs u ozracenom gorivu. Program je napisan u FORTRAN-u IV u jednom bloku, bez podprograma. Izracunavanje izgaranja je zasnovano na izmerenim kolicnicima aktivnosti fisionih produkata. Rezultati izgaranja imaju apsolutni karakter (author)

  9. Salinity controls on Na incorporation in Red Sea planktonic foraminifera

    Science.gov (United States)

    Mezger, E. M.; de Nooijer, L. J.; Boer, W.; Brummer, G. J. A.; Reichart, G. J.

    2016-12-01

    Whereas several well-established proxies are available for reconstructing past temperatures, salinity remains challenging to assess. Reconstructions based on the combination of (in)organic temperature proxies and foraminiferal stable oxygen isotopes result in relatively large uncertainties, which may be reduced by application of a direct salinity proxy. Cultured benthic and planktonic foraminifera showed that Na incorporation in foraminiferal shell calcite provides a potential independent proxy for salinity. Here we present the first field calibration of such a potential proxy. Living planktonic foraminiferal specimens from the Red Sea surface waters were collected and analyzed for their Na/Ca content using laser ablation quadrupole inductively coupled plasma mass spectrometry. Using the Red Sea as a natural laboratory, the calibration covers a broad range of salinities over a steep gradient within the same water mass. For both Globigerinoides ruber and Globigerinoides sacculi