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Sample records for ray transmission medida

  1. Porosity measurement of amorphous materials by gamma ray transmission; Medida de porosidade de materiais amorfos por transmissao de raios gama

    Energy Technology Data Exchange (ETDEWEB)

    Poettker, Walmir Eno

    2000-07-01

    In this work it is presented the measurement of the total porosity of TRe soil, Sandstone Berea rocks and porous ceramics samples. For the determination of the total porosity, the Arquimedes method (conventional) and the gamma ray transmission methodology were employed. The porosity measurement using the gamma methodology has a significant advantage respect to the conventional method due to the fast and non-destructive determination, and also for supplying results with a greater characterization in small scales, in relation to the heterogeneity of the porosity. The conventional methodology presents good results only for homogeneous samples. The experimental set up for the gamma ray transmission technique consisted of a {sup 241} Am source (59,53 keV), a NaI (Tl) scintillation detector, collimators, a XYZ, micrometric table and standard gamma spectrometry electronics connected to a multichannel analyser. (author)

  2. X-Ray Absorption with Transmission X-Ray Microscopes

    NARCIS (Netherlands)

    de Groot, F.M.F.|info:eu-repo/dai/nl/08747610X

    2016-01-01

    In this section we focus on the use of transmission X-ray microscopy (TXM) to measure the XAS spectra. In the last decade a range of soft X-ray and hard X-ray TXM microscopes have been developed, allowing the measurement of XAS spectra with 10–100 nm resolution. In the hard X-ray range the TXM

  3. Full-field transmission x-ray imaging with confocal polycapillary x-ray optics

    OpenAIRE

    Sun, Tianxi; MacDonald, C.A.

    2013-01-01

    A transmission x-ray imaging setup based on a confocal combination of a polycapillary focusing x-ray optic followed by a polycapillary collimating x-ray optic was designed and demonstrated to have good resolution, better than the unmagnified pixel size and unlimited by the x-ray tube spot size. This imaging setup has potential application in x-ray imaging for small samples, for example, for histology specimens.

  4. Full-field transmission x-ray imaging with confocal polycapillary x-ray optics.

    Science.gov (United States)

    Sun, Tianxi; Macdonald, C A

    2013-02-07

    A transmission x-ray imaging setup based on a confocal combination of a polycapillary focusing x-ray optic followed by a polycapillary collimating x-ray optic was designed and demonstrated to have good resolution, better than the unmagnified pixel size and unlimited by the x-ray tube spot size. This imaging setup has potential application in x-ray imaging for small samples, for example, for histology specimens.

  5. Medidas de prevenção da transmissão vertical do HIV empregadas por mães de crianças o positivas Medidas de prevención de la transmisión vertical del VIH empleadas por madres de niños seropositivos HIV vertical transmission preventive measurements used by mothers of seropositive children

    Directory of Open Access Journals (Sweden)

    Aline da Fonseca Leal

    2012-03-01

    Full Text Available Objetivo. Analisar as medidas de prevenção da transmissão vertical do HIV empregadas pelas mães de meninos HIV positivos que foram acompanhadas pelo Serviço de Atendimento Especializado (SAE do município de Pelotas, Rio Grande do Sul (Brasil. Metodologia. Investigação qualitativa com abordagem descritiva e exploratório. Os dados foram coletados através de entrevistas semi-estruturadas a cinco mães de meninos HIV positivo; a análise da informação se fez por categorização temática. Resultados. Observou-se que o principal fator que põe obstáculos a realização de medidas de prevenção da transmissão vertical do HIV foi a omissão do pessoal de saúde de solicitar a prova do HIV. A maioria das interrogadas mostrou conhecimento sobre a doença e das medidas pára de prevenção da mesma. Conclusão. Existe a necessidade de capacitar aos profissionais da saúde na difusão de medidas preventivas com o fim de melhorar o atendimento pré-natal.Objetivo. Analizar las medidas de prevención de la transmisión vertical del VIH empleadas por las madres de niños VIH positivos que fueron acompañadas por el Servicio de Atención Especializado (SAE del municipio de Pelotas, Rio Grande do Sul (Brasil. Metodología. Investigación cualitativa con abordaje descriptivo y exploratorio. Los datos fueron recolectados mediante de entrevistas semi-estructuradas a cinco madres de niños VIH positivos; el análisis de la información se hizo por categorización temática. Resultados. El principal factor que obstaculiza la realización de medidas de prevención de la transmisión vertical del VIH fue la omisión del personal de salud de solicitar la prueba del VIH. La mayoría de las encuestadas mostró conocimiento sobre la enfermedad y de las medidas de prevención de la misma. Conclusión. Existe la necesidad de capacitar a los profesionales de la salud en la difusión de medidas preventivas con el fin de mejorar la atención prenatal

  6. Description of a transmission X-ray computed tomography scanner

    Energy Technology Data Exchange (ETDEWEB)

    Hamideen, M.S., E-mail: mhamideen@fet.edu.jo [Department of Applied Science, Faculty of Engineering Technology, Al-Balqa' Applied University, Amman (Jordan); Sharaf, J.; Al-Saleh, K.A. [Department of Physics, University of Jordan, Amman (Jordan); Shaderma, M. [Department of Applied science, Faculty of Prince Abdullah bin Ghazi, Al-Balqa' Applied University, Amman (Jordan)

    2011-11-15

    A new prototype X-ray computed tomography scanner has been designed, constructed and tested locally. The major system employs an X-ray tube, a semiconductor detector, data logger and a three-dimensional sample position controller driven by three stepping motors, which allow two linear translations in addition to the rotational motion. The image resolution is determined by the step size and the diameter of the X-ray beam, which is controlled by the pinhole collimator. The scanner is designed to reconstruct two- and three-dimensional images mapping the internal structures of the object with the aid of the computer. This system, due to the semiconductor detector used, presents the novelty of being potentially able to acquire both in CT (transmission) mode and in SPECT (emission) mode. The imaging system performance is inspected for different phantoms, and some typical reconstructed images are presented. - Highlights: > A prototype X-ray transmission CT scanner system was designed and constructed successfully at the X-ray Laboratory in the University of Jordan. > X-ray CT scanner demonstrated its capability as a non-destructive tool for evaluating the internal atomic details of material objects. > Some general problems of X-ray CT scanning and image reconstruction are discussed and some suggested solutions are presented. > Scanner is designed to reconstruct two- and three-dimensional images mapping the internal structures of the object with the aid of the computer. > Internal geometrical structure can be determined from CT images.

  7. Laboratory full-field transmission x-ray microscopy

    Science.gov (United States)

    Seim, Christian; Baumann, Jonas; Legall, Herbert; Redlich, Christoph; Mantouvalou, Ioanna; Blobel, G.; Stiel, Holger; Kanngießer, Birgit

    2012-01-01

    X-ray microscopy in the water window has become a valuable imaging tool for a wide field of applications with a resolution in the nanometer regime. The emergence and the development of laboratory based transmission X-ray microscopes (LTXM) can be of great benefit to users, since LTXM provides access to a method previously limited to synchrotron facilities only. In recent years, measuring times in the laboratory have been reduced to the point, where tomography of aqueous cryofixated samples has become feasible. We report on a laboratory full-field transmission X-ray microscope based on a laser induced plasma source located at the Berlin Laboratory for innovative X-ray Technologies. A short introduction on full-field X-ray microscopy in the water window is given. We demonstrate that, with a thin disk laser-system (TDL), which provides an average power of ~15 W a spatial resolution of Δx = 41 nm +/- 3 nm (half-pitch) is feasible. An image of a diatom recorded at 15 W average laser power with a magnification of 1125x captured in 5 min is presented.

  8. Medidas contraceptivas e de proteção da transmissão do HIV por mulheres com HIV/Aids

    Directory of Open Access Journals (Sweden)

    Galvão Marli T Gimeniz

    2004-01-01

    Full Text Available OBJETIVO: Atualmente, entre as mulheres, a relação sexual é a forma de transmissão que mais tem contribuído para a feminização da epidemia de HIV/Aids. Na busca constante de se estabelecer padrões mais adequados de orientação para saúde, investigou-se o uso de medidas contraceptivas, que também sirvam de proteção da transmissão do HIV, entre mulheres portadoras de HIV/Aids. MÉTODOS: Estudo exploratório desenvolvido em um serviço público ambulatorial de um hospital universitário, referência aos portadores de HIV/Aids da região centro-sul do Estado de São Paulo, no período de cinco meses (2000 a 2001. Foram estudadas 73 mulheres portadoras da infecção pelo HIV, ou com Aids. Os dados foram obtidos por meio de um formulário que investigava a caracterização sociodemográfica, as formas de anticoncepção utilizada e a situação sorológica do parceiro sexual. Os dados foram analisados descritivamente e os conteúdos das respostas abertas, agrupados em temas. Foi aplicado o teste exato de Fisher para análise de algumas variáveis, em nível de 5%. Para a análise de conteúdo utilizou-se a proposta de Bardin. RESULTADOS: A maioria das mulheres estava em fase de vida reprodutiva, eram casadas e foram contaminadas quase exclusivamente por meio da relação heterossexual. Entre elas, 35,4% referiam parceiro sexual discordante quanto à sorologia anti-HIV, e 13,7% utilizavam formas inadequadas de anticoncepção que também não protegiam da transmissão do HIV. CONCLUSÕES: Os resultados alertam para a necessidade de ações educativas continuadas quanto a experiências sexuais mais seguras entre portadoras de HIV/Aids, para que elas possam discutir com seus parceiros outras formas de exercerem sua sexualidade, sendo capazes de estabelecer opção contraceptiva mais consciente, de maneira a zelar pela sua saúde, do parceiro e até do concepto.

  9. Behavior of characteristic X-rays from a partial-transmission-type X-ray target.

    Science.gov (United States)

    Raza, Hamid Saeed; Kim, Hyun Jin; Ha, Jun Mok; Cho, Sung Oh

    2013-10-01

    The angular distribution of characteristic X-rays using a partial-transmission tungsten target was analyzed. Twenty four tallies were modeled to cover a 360° envelope around the target. The Monte Carlo N-Particle (MCNP5) simulation results revealed that the characteristic X-ray flux is not always isotropic around the target. Rather, the flux mainly depends on the target thickness and the energy of the incident electron beam. A multi-energy photon generator is proposed to emit high-energy characteristic X-rays, where the target acts as a filter for the low-energy characteristic X-rays. Copyright © 2013 Elsevier Ltd. All rights reserved.

  10. Medidas preventivas contra a AIDS e outras doenças sexualmente transmissíveis conhecidas por universitários da área de saúde Medidas preventivas contra SIDA y otras enfermedades sexualmente transmisibles conocidas por universitarios del campo de la salud Preventive measures against AIDS and other sexually transmitted diseases known by undergraduate health students

    Directory of Open Access Journals (Sweden)

    Elucir Gir

    1999-01-01

    Full Text Available Objetivando identificar as medidas de prevenção conhecidas por universitários da área da saúde, acerca da contaminação pelo HIV e outras Doenças Sexualmente Transmissíveis (essencialmente de transmissão sexual e identificar se há diferença significativa entre as citações, considerando-se o sexo dos sujeitos, realizou-se esta investigação. Foi aplicado um questionário estruturado em universitários da área da saúde aleatoriamente selecionados. Os resultados revelaram que a maioria dos itens citados como medidas preventivas para a AIDS e DST se enquadra dentro das medidas importantes para a prevenção das mesmas, no entanto, quando a análise é feita em termos da freqüência citada, ou seja, o número de estudantes que mencionaram medidas corretas, verifica-se que foi aquém do esperado, o que se torna preocupante. Outro aspecto observado nos resultados é que não há diferença, em termos de conhecimentos sobre medidas preventivas, entre estudantes do sexo masculino e feminino. Assim, a análise dos resultados permite evidenciar que os conhecimentos da maioria dos estudantes universitários estudados são precários, o que reforça a necessidade de implementar ações educativas específicas e contínuas.El presente estudio tiene los objetos de identificar las medidas preventivas conocidas por universitarios del campo de la salud, a respecto de la contaminación por HIV y otras enfermedades sexualmente transmisibles, y identificar si hay diferencia significativa entre las respuestas, considerando el sexo de los sujetos. Un cuestionario fue aplicado en universitarios del campo de la salud, los cuales fueron aleatoriamente seleccionados. Las medidas más frecuentes muestran que las medidas preventivas referidas por los universitarios são importantes, pero no observamos diferencia entre conocimiento de los estudiantes de diferentes sexos. Los universitarios están bien informados sobre medidas preventivas generales contra

  11. Sexualidade na terceira idade: medidas de prevenção para doenças sexualmente transmissíveis e AIDS Sexualidad en la tercera edad: medidas de prevención de enfermedades de transmisión sexual y SIDA Sexuality in the elderly: prevention methods for sexually transmissible illnesses and AIDS

    Directory of Open Access Journals (Sweden)

    Manoela Busato Mottin Maschio

    2011-09-01

    Full Text Available O objetivo deste estudo foi identificar as medidas de prevenção que os idosos estão utilizando para à prevenção das Doenças Sexualmente Transmissíveis e Síndrome da Imunodeficiência Adquirida. A pesquisa foi de caráter prospectivo, quantitativo e descritivo com uma amostragem intencional, realizada com 98 idosos. Foi aplicado um questionário com perguntas abertas e fechadas, relacionadas à vida sexual dos idosos frequentadores de uma instituição que desenvolve programas para a melhoria da qualidade de vida dos idosos no município de Curitiba, Paraná. Dos entrevistados 43%, relatam fazer uso de alguma medida de prevenção. A realização de programas de prevenção voltados para o atendimento de pessoas com 50 anos ou mais, deve estar atenta às questões de sexualidade no envelhecimento. Os idosos devem ser vistos como indivíduos que possuem desejos, necessidades sexuais e que fazem projetos para o futuro.El objetivo de este estudio es identificar medidas que los ancianos están utilizando para la prevención de enfermedades de transmisión sexual y el Enfermedades de Transmisión Sexual Síndrome de Inmunodeficiencia Adquirida. La encuesta fue de carácter prospectivo y cuantitativo con una muestra intencional, realizado con 98 personas de edad avanzada. Se aplicó un cuestionario con preguntas abiertas y cerradas, relacionadas con la vida sexual de los visitantes mayores de una institución que desarrolla programas para la mejora de la calidad de vida de las personas mayores en la ciudad de Curitiba, Paraná, Brasil. De los 43% de los encuestados informaron que usan de alguna medida de prevención. La ejecución de los programas de prevención se centró en la atención de personas mayores de 50 años o más, deben de estar atentos a las cuestiones de la sexualidad en el envejecimiento. Los ancianos deben ser vistos como individuos que tienen necesidades sexuales y deseos, que hacen proyectos para el futuro.This study aimed

  12. High-resolution x-ray studies of an AXAF high-energy transmission grating

    DEFF Research Database (Denmark)

    Abdali, S.; Christensen, Finn Erland; Schnopper, H. W.

    1993-01-01

    A triple axis X-ray diffractometer, designed and built at the Danish Space Research Institute, was used to make a high resolution study of the performance of a 2000 angstroms period, high energy X-ray transmission grating developed at MIT for one of the grating spectrometers on the Advanced X-ray...

  13. Characterizing automotive fuel cell materials by soft x-ray scanning transmission x-ray microscopy

    Energy Technology Data Exchange (ETDEWEB)

    Hitchcock, A. P., E-mail: aph@mcmaster.ca; Lee, V.; Wu, J.; Cooper, G. [Chemistry & Chemical Biology, McMaster University, Hamilton, ON, L8S 4M1 (Canada); West, M. M.; Berejnov, V. [Faculty of Health Sciences Electron Microscopy, McMaster University, Hamilton, ON L8N 3Z5 (Canada); Soboleva, T.; Susac, D.; Stumper, J. [Automotive Fuel Cell Cooperation Corp., Burnaby BC V5J 5J8 (Canada)

    2016-01-28

    Proton-Exchange Membrane Fuel Cell (PEM-FC) based engines are being developed rapidly for near-term implementation in hydrogen fueled, mass production, personal automobiles. Research is focused on understanding and controlling various degradation processes (carbon corrosion, Pt migration, cold start), and reducing cost by reducing or eliminating Pt catalyst. We are using soft X-ray scanning transmission X-ray microscopy (STXM) at the S 2p, C 1s, O 1s and F 1s edges to study a variety of issues related to optimization of PEM-FC materials for automotive applications. A method to efficiently and accurately measure perfluorosulfonic acid distributions was developed and is being used to better understand how different loadings and preparation methods affect the ionomer distribution in the cathode. Progress towards an environmental cell capable of controlling the temperature and humidity of a PEM-FC sample in the STXM is described. Methods for studying the 3D chemical structure of PEM-FC are outlined.

  14. Characterizing automotive fuel cell materials by soft x-ray scanning transmission x-ray microscopy

    Science.gov (United States)

    Hitchcock, A. P.; Lee, V.; Wu, J.; West, M. M.; Cooper, G.; Berejnov, V.; Soboleva, T.; Susac, D.; Stumper, J.

    2016-01-01

    Proton-Exchange Membrane Fuel Cell (PEM-FC) based engines are being developed rapidly for near-term implementation in hydrogen fueled, mass production, personal automobiles. Research is focused on understanding and controlling various degradation processes (carbon corrosion, Pt migration, cold start), and reducing cost by reducing or eliminating Pt catalyst. We are using soft X-ray scanning transmission X-ray microscopy (STXM) at the S 2p, C 1s, O 1s and F 1s edges to study a variety of issues related to optimization of PEM-FC materials for automotive applications. A method to efficiently and accurately measure perfluorosulfonic acid distributions was developed and is being used to better understand how different loadings and preparation methods affect the ionomer distribution in the cathode. Progress towards an environmental cell capable of controlling the temperature and humidity of a PEM-FC sample in the STXM is described. Methods for studying the 3D chemical structure of PEM-FC are outlined.

  15. Advanced experimental applications for x-ray transmission gratings spectroscopy using a novel grating fabrication method

    Energy Technology Data Exchange (ETDEWEB)

    Hurvitz, G.; Ehrlich, Y.; Shpilman, Z.; Levy, I.; Fraenkel, M. [Plasma Physics Department, Applied Physics Division, Soreq NRC, Yavne (Israel); Strum, G. [Solid State Department, Applied Physics Division, Soreq NRC, Yavne (Israel)

    2012-08-15

    A novel fabrication method for soft x-ray transmission grating and other optical elements is presented. The method uses focused-ion-beam technology to fabricate high-quality free standing grating bars on transmission electron microscopy grids. High quality transmission gratings are obtained with superb accuracy and versatility. Using these gratings and back-illuminated CCD camera, absolutely calibrated x-ray spectra can be acquired for soft x-ray source diagnostics in the 100-3000 eV spectral range. Double grating combinations of identical or different parameters are easily fabricated, allowing advanced one-shot application of transmission grating spectroscopy. These applications include spectroscopy with different spectral resolutions, bandwidths, dynamic ranges, and may serve for identification of high-order contribution, and spectral calibrations of various x-ray optical elements.

  16. In-situ Scanning Transmission X-Ray Microscopy of Catalytic Solids and Related Nanomaterials

    NARCIS (Netherlands)

    de Groot, F.M.F.; de Smit, E.; van Schooneveld, M.M.; Aramburo, L.R.; Weckhuysen, B.M.

    2013-01-01

    The present status of in-situ scanning transmission X-ray microscopy (STXM) is reviewed, with an emphasis on the abilities of the STXM technique in comparison with electron microscopy. The experimental aspects and interpretation of X-ray absorption spectroscopy (XAS) are briefly introduced and the

  17. Nanofabrication and characterization of high-line-density x-ray transmission gratings

    DEFF Research Database (Denmark)

    Zhu, Xiaoli; Li, Hailiang; Cao, Leifeng

    2017-01-01

    We report the nanofabrication and characterization of x-ray transmission gratings with a high aspect ratio and a feature size of down to 65 nm. Two nanofabrication methods, the combination of electron beam and optical lithography and the combination of electron beam, x-ray, and optical lithograph...... the development of x-ray diffractive optical elements. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)...

  18. Transmission properties and physical mechanisms of X-ray communication for blackout mitigation during spacecraft reentry

    Science.gov (United States)

    Liu, Yunpeng; Li, Huan; Li, Yanlong; Hang, Shuang; Tang, Xiaobin

    2017-11-01

    Recent advances in X-ray science have witnessed the X-ray communication (XCOM), a new revolutionary technology first proposed by NASA since 2007. In combination with the advanced modulated X-ray source, XCOM shows a promising prospect for helping to alleviate the occurrence of inevitable blackout communication by using the regular radio frequency (RF) signal, paving the way towards realizing real-time communication during spacecraft reentry into atmosphere. Here, we acquired the detailed information of electron density distribution of plasma sheath encountered during vehicle reentry through Computational Fluid Dynamics simulation. Based on these derived parameters, Finite-difference Time-domain method was employed to investigate the transmission properties of X-rays through the plasma sheath, and the results indicated that X-ray transmission was not influenced by the reentry plasma sheath at different reentry altitudes and spacecraft surface positions compared with RF signal. In addition, 2D Particle-In-Cell simulation was also adopted to provide deeper insight into the transmission properties and physical mechanisms of X-ray carrier propagating through the plasma sheath, and results showed that the transmission coefficient was over 0.994 and the observation of plasma channel effect was also an important signature, which was of great importance to X-ray propagating through the plasma sheath.

  19. Soft x-ray spectromicroscopy using compact scanning transmission x-ray microscope at the photon factory

    Energy Technology Data Exchange (ETDEWEB)

    Takeichi, Yasuo, E-mail: yasuo.takeichi@kek.jp; Inami, Nobuhito; Ono, Kanta [High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801 (Japan); Ueno, Tetsuro [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan); Suga, Hiroki [Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526 (Japan); Takahashi, Yoshio [The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)

    2016-07-27

    We report the stability and recent performances of a new type of scanning transmission X-ray microscopy. The optics and compact design of the microscope realized mobility and robust performance. Detailed consideration to the vibration control will be described. The insertion device upgraded to elliptical polarization undulator enabled linear dichroism and circular dichroism experiments.

  20. Porosity measurement of solid pharmaceutical dosage forms by gamma-ray transmission

    Energy Technology Data Exchange (ETDEWEB)

    Martins de Oliveira, Jose, E-mail: jose.oliveira@prof.uniso.b [Universidade de Sorocaba, UNISO, Campus Seminario, Caixa Postal 578, Avenue, Dr. Eugenio Salermo, 100, Centro, 18035-430 Sorocaba, SP (Brazil); Andreo Filho, Newton; Vinicius Chaud, Marco; Angiolucci, Tatiana; Aranha, Norberto [Universidade de Sorocaba, UNISO, Campus Seminario, Caixa Postal 578, Avenue, Dr. Eugenio Salermo, 100, Centro, 18035-430 Sorocaba, SP (Brazil); Germano Martins, Antonio Cesar [Universidade Estadual Paulista Julio de Mesquita Filho, UNESP, GAGI, Avenue, 3 de Marco, 511, Alto da Boa Vista, 18087-180 Sorocaba, SP (Brazil)

    2010-12-15

    The aim of the present work is the determination of porosity in tablets by using the gamma-ray transmission technique. Tablet dissolution depends on some inherent characteristics of the manufacturing process, such as compression force, tablet volume, density and porosity, nature of excipients, preparation methods and its physical-chemical properties. Porosity is a measure of empty spaces in a material and can be determined by various techniques. In this paper, we propose the use of a gamma-ray transmission technique to obtain the porosity of experimental formulation of tablets. The results of porosity were compared with those obtained by using conventional methodology (density and mercury intrusion). The experimental setup for gamma-ray transmission consists of a gamma-ray source of {sup 241}Am (photons of 59.6 keV and an activity of 3.7x10{sup 9} Bq), an NaI(Tl) scintillation detector, collimators and a standard gamma-ray spectrometry electronics. Our results suggest that the gamma-ray transmission technique is a powerful tool for non-destructive porosity quantification of solid pharmaceutical forms and presents smaller errors than those obtained with conventional methodologies.

  1. Rapid simulation of X-ray transmission imaging for baggage inspection via GPU-based ray-tracing

    Science.gov (United States)

    Gong, Qian; Stoian, Razvan-Ionut; Coccarelli, David S.; Greenberg, Joel A.; Vera, Esteban; Gehm, Michael E.

    2018-01-01

    We present a pipeline that rapidly simulates X-ray transmission imaging for arbitrary system architectures using GPU-based ray-tracing techniques. The purpose of the pipeline is to enable statistical analysis of threat detection in the context of airline baggage inspection. As a faster alternative to Monte Carlo methods, we adopt a deterministic approach for simulating photoelectric absorption-based imaging. The highly-optimized NVIDIA OptiX API is used to implement ray-tracing, greatly speeding code execution. In addition, we implement the first hierarchical representation structure to determine the interaction path length of rays traversing heterogeneous media described by layered polygons. The accuracy of the pipeline has been validated by comparing simulated data with experimental data collected using a heterogenous phantom and a laboratory X-ray imaging system. On a single computer, our approach allows us to generate over 400 2D transmission projections (125 × 125 pixels per frame) per hour for a bag packed with hundreds of everyday objects. By implementing our approach on cloud-based GPU computing platforms, we find that the same 2D projections of approximately 3.9 million bags can be obtained in a single day using 400 GPU instances, at a cost of only 0.001 per bag.

  2. Scanning transmission x-ray microscopy: A new ``looking glass`` into coal chemical structure

    Energy Technology Data Exchange (ETDEWEB)

    Botto, R.E.; Cody, G.D.

    1994-02-01

    This paper reports the use of scanning transmission x-ray microscopy to spatially map the chemistry of aromatic and aliphatic carbon functionalities in coal to a resolution of less than 0.1 {mu}m. Localized x-ray absorption spectroscopy recorded at the carbon K absorption edge was also used to facilitate analysis of variations in fundamental chemistry at maceral interfaces and within maceral boundaries.

  3. Anatomy-based transmission factors for technique optimization in portable chest x-ray

    Science.gov (United States)

    Liptak, Christopher L.; Tovey, Deborah; Segars, William P.; Dong, Frank D.; Li, Xiang

    2015-03-01

    Portable x-ray examinations often account for a large percentage of all radiographic examinations. Currently, portable examinations do not employ automatic exposure control (AEC). To aid in the design of a size-specific technique chart, acrylic slabs of various thicknesses are often used to estimate x-ray transmission for patients of various body thicknesses. This approach, while simple, does not account for patient anatomy, tissue heterogeneity, and the attenuation properties of the human body. To better account for these factors, in this work, we determined x-ray transmission factors using computational patient models that are anatomically realistic. A Monte Carlo program was developed to model a portable x-ray system. Detailed modeling was done of the x-ray spectrum, detector positioning, collimation, and source-to-detector distance. Simulations were performed using 18 computational patient models from the extended cardiac-torso (XCAT) family (9 males, 9 females; age range: 2-58 years; weight range: 12-117 kg). The ratio of air kerma at the detector with and without a patient model was calculated as the transmission factor. Our study showed that the transmission factor decreased exponentially with increasing patient thickness. For the range of patient thicknesses examined (12-28 cm), the transmission factor ranged from approximately 21% to 1.9% when the air kerma used in the calculation represented an average over the entire imaging field of view. The transmission factor ranged from approximately 21% to 3.6% when the air kerma used in the calculation represented the average signals from two discrete AEC cells behind the lung fields. These exponential relationships may be used to optimize imaging techniques for patients of various body thicknesses to aid in the design of clinical technique charts.

  4. Compact scanning transmission x-ray microscope at the photon factory

    Energy Technology Data Exchange (ETDEWEB)

    Takeichi, Yasuo, E-mail: yasuo.takeichi@kek.jp; Inami, Nobuhito; Ono, Kanta [High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801 (Japan); Suga, Hiroki [Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526 (Japan); Takahashi, Yoshio [Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526 (Japan); The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)

    2016-01-28

    We report the design and performance of a compact scanning transmission X-ray microscope developed at the Photon Factory. Piezo-driven linear stages are used as coarse stages of the microscope to realize excellent compactness, mobility, and vibrational and thermal stability. An X-ray beam with an intensity of ∼10{sup 7} photons/s was focused to a diameter of ∼40 nm at the sample. At the soft X-ray undulator beamline used with the microscope, a wide range of photon energies (250–1600 eV) is available. The microscope has been used to research energy materials and in environmental sciences.

  5. Self-detection of x-ray Fresnel transmissivity using photoelectron-induced gas ionization

    OpenAIRE

    Stoupin, Stanislav

    2015-01-01

    Electric response of an x-ray mirror enclosed in a gas flow ionization chamber was studied under the conditions of total external reflection for hard x-rays. It is shown that the electric response of the system as a function of the incidence angle is defined by x-ray Fresnel transmissivity and photon-electron attenuation properties of the mirror material. A simple interpretation of quantum yield of the system is presented. The approach could serve as a basis for non-invasive in-situ diagnosti...

  6. X-ray transmission through nanostructured and microstructured CuO materials

    Energy Technology Data Exchange (ETDEWEB)

    Botelho, M.Z. [Area de Ciencias Tecnologicas, Centro Universitario Franciscano, Rua dos Andradas, 1614, CEP 97010-032 Santa Maria, RS (Brazil); Kuenzel, R., E-mail: roselikunzel@gmail.co [Universidade de Sao Paulo, Instituto de Fisica, Departamento de Fisica Nuclear, Cidade Universitaria, CEP 05508-090 Sao Paulo, SP (Brazil); Okuno, E. [Universidade de Sao Paulo, Instituto de Fisica, Departamento de Fisica Nuclear, Cidade Universitaria, CEP 05508-090 Sao Paulo, SP (Brazil); Levenhagen, R.S. [Universidade Federal de Sao Paulo, Departamento de Ciencias Exatas e da Terra, Rua Arthur Ridel, 275, Jardim Eldorado, CEP 09941-510 Diadema, SP (Brazil); Basegio, T.; Bergmann, C.P. [Universidade Federal do Rio Grande do Sul, Escola de Engenharia, Departamento de Materiais, Avenida Osvaldo Aranha, 99, CEP 90035-190 Porto Alegre, RS (Brazil)

    2011-02-15

    This study presents a comparison of the X-ray transmission through microsized and nanosized materials. For this purpose CuO nanoparticles, with 13.4 nm average grain size, and CuO microparticles, with a mean particle size of 56{mu}m, were incorporated separately to beeswax in a concentration of 5%. Results show that the transmission through the above material plates with microsized and nanosized CuO was almost the same for X-ray beams generated at 60 and 102 kV tube voltages. However, for the radiation beams generated at 26 and 30 kV tube voltages the X-rays are more attenuated by the nanostructured CuO plates by a factor of at least 14%. Results suggest that the difference in the low energy range may be due to the higher number of particles/gram in the plates designed with CuO nanoparticles and due to the grain size effect on the X-ray transmission.

  7. X-ray absorption in pillar shaped transmission electron microscopy specimens

    Energy Technology Data Exchange (ETDEWEB)

    Bender, H., E-mail: hugo.bender@imec.be [Imec, Kapeldreef 75, 3001 Leuven (Belgium); Seidel, F.; Favia, P.; Richard, O. [Imec, Kapeldreef 75, 3001 Leuven (Belgium); Vandervorst, W. [Imec, Kapeldreef 75, 3001 Leuven (Belgium); Instituut voor Kern- en Stralingsfysica, KU Leuven, 3001 Leuven (Belgium)

    2017-06-15

    Highlights: • Universal curves for X-ray absorption in pillar shaped TEM specimens are derived. • Absorption effects in pillars are a factor 3 less important than in planar specimens. • Medium absorbed X-rays require constant absorption correction across the pillar. • Major absorption for thin layers occurs in the surrounding materials. • Tabulated mass attenuation coefficients predict the absorption well. - Abstract: The dependence of the X-ray absorption on the position in a pillar shaped transmission electron microscopy specimen is modeled for X-ray analysis with single and multiple detector configurations and for different pillar orientations relative to the detectors. Universal curves, applicable to any pillar diameter, are derived for the relative intensities between weak and medium or strongly absorbed X-ray emission. For the configuration as used in 360° X-ray tomography, the absorption correction for weak and medium absorbed X-rays is shown to be nearly constant along the pillar diameter. Absorption effects in pillars are about a factor 3 less important than in planar specimens with thickness equal to the pillar diameter. A practical approach for the absorption correction in pillar shaped samples is proposed and its limitations discussed. The modeled absorption dependences are verified experimentally for pillars with HfO{sub 2} and SiGe stacks.

  8. Measurement of X-ray transmission factors of some boron compounds

    Energy Technology Data Exchange (ETDEWEB)

    Icelli, Orhan E-mail: orhan_icelli@hotmail.com; Erzeneoglu, Salih; Boncukcuogluc, Recep

    2003-12-01

    Measurements have been made to determine X-ray transmission factors of some boron compounds (H{sub 3}BO{sub 3},Na{sub 2}B{sub 4}O{sub 7} and B{sub 3}Al{sub 2}O{sub 3}) by using an extremely narrow-collimated-beam transmission method in the energy range 15.746-40.930 keV. The characteristic K{alpha} and K{beta} X-rays of the different elements (Zr, Mo, Ag, In, Sb, Ba and Pr) passed through boron compounds were detected with a high-resolution Si(Li) detector. Results are presented and discussed in this paper.

  9. Final Report on Small Particle Speciation for Forensics Analysis by Soft X-ray Scanning Transmission X-ray Microscopy

    Energy Technology Data Exchange (ETDEWEB)

    Pacold, J. I. [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Altman, A. B. [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Donald, S B [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Dai, Z. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Davisson, M. L. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Holliday, K S [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Knight, K. B. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Kristo, M. J. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Minasian, S. G. [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Nelson, A J [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Tyliszczak, T [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Booth, C. H. [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Shuh, D. K. [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

    2016-09-30

    Materials of interest for nuclear forensic science are often highly heterogeneous, containing complex mixtures of actinide compounds in a wide variety of matrices. Scanning transmission X-ray microscopy (STXM) is ideally suited to study such materials, as it can be used to chemically image specimens by acquiring X-ray absorption near-edge spectroscopy (XANES) data with 25 nm spatial resolution. In particular, STXM in the soft X-ray synchrotron radiation regime (approximately 120 – 2000 eV) can collect spectroscopic information from the actinides and light elements in a single experiment. Thus, STXM combines the chemical sensitivity of X-ray absorption spectroscopy with high spatial resolution in a single non-destructive characterization method. This report describes the application of STXM to a broad range of nuclear materials. Where possible, the spectroscopic images obtained by STXM are compared with information derived from other analytical methods, and used to make inferences about the process history of each material. STXM measurements can yield information including the morphology of a sample, “elemental maps” showing the spatial distribution of major chemical constituents, and XANES spectra from localized regions of a sample, which may show spatial variations in chemical composition.

  10. Scanning Transmission X-ray Microscopy: Applications in Atmospheric Aerosol Research

    Energy Technology Data Exchange (ETDEWEB)

    Moffet, Ryan C.; Tivanski, Alexei V.; Gilles, Mary K.

    2011-01-20

    Scanning transmission x-ray microscopy (STXM) combines x-ray microscopy and near edge x-ray absorption fine structure spectroscopy (NEXAFS). This combination provides spatially resolved bonding and oxidation state information. While there are reviews relevant to STXM/NEXAFS applications in other environmental fields (and magnetic materials) this chapter focuses on atmospheric aerosols. It provides an introduction to this technique in a manner approachable to non-experts. It begins with relevant background information on synchrotron radiation sources and a description of NEXAFS spectroscopy. The bulk of the chapter provides a survey of STXM/NEXAFS aerosol studies and is organized according to the type of aerosol investigated. The purpose is to illustrate the current range and recent growth of scientific investigations employing STXM-NEXAFS to probe atmospheric aerosol morphology, surface coatings, mixing states, and atmospheric processing.

  11. Tamper asymmetry and its effect on transmission for x-ray driven opacity simulations

    Science.gov (United States)

    Morris, H. E.; Tregillis, I. L.; Hoffman, N. M.; Sherrill, M. E.; Fontes, C. J.; Marshall, A. J.; Urbatsch, T. J.; Bradley, P. A.

    2017-09-01

    This paper reports on synthetic transmission results from Lasnex [Zimmerman and Kruer, Comments Plasma Phys. 2, 51 (1975)] radiation-hydrodynamics simulations of opacity experiments carried out at Sandia National Laboratories' recently upgraded ZR facility. The focus is on experiments utilizing disk targets composed of a half-moon Fe/Mg mixture tamped on either end with 10-μm CH and an additional 35-μm beryllium tamper accessory on the end facing the spectrometer. Five x-ray sources with peak power ranging from 10 to 24 TW were used in the simulations to heat and backlight the opacity target. The dominant effect is that the beryllium behind the Fe/Mg mixture is denser and more opaque than the beryllium unshielded by metal during the times of greatest importance for the transmission measurement for all drives. This causes the simulated transmission to be lower than expected, and this is most pronounced for the case using the lowest drive power. While beryllium has a low opacity, its areal density is sufficiently high such that the expected reduction of the measured transmission is significant. This situation leads to an overestimate of iron opacity by 10%-215% for a photon energy range of 975-1775 eV for the 10-TW case. It is shown that if the tamper conditions are known, the transmission through each component of the target can be calculated and the resulting opacity can be corrected.

  12. Medidas difusas e integrales difusas

    OpenAIRE

    Arenas-Díaz, Gilberto; Universidad Industrial de Santander; Ramírez Lamus, Edgar René; Escuela de Matemáticas, Universidad Industrial de Santander, Bucaramanga, Colombia.

    2013-01-01

    Presentar un estudio de las medidas difusas y de las integrales difusas, y mostrar algunos fenómenos donde estas son utilizadas. Se expone cómo es introducido el concepto de medida difusa y cómo a partir de él se introduce la noción de integral difusa. Se establecen propiedades de las medidas difusas y se clasifican de acuerdo a la propiedad aditiva y las λ-medidas, se observa cómo las medidas de probabilidad, plausibilidad, credibilidad, posibilidad y necesidad son ejemplos clásicos en la cl...

  13. Transmissão materno-infantil do vírus da imunodeficiência humana: avaliação de medidas de controle no município de Santos Mother-to-child transmission of human immunodeficiency virus (HIV-I: evaluation of control measures in the city of Santos

    Directory of Open Access Journals (Sweden)

    Teresa Maria Isaac Nishimoto

    2005-02-01

    Full Text Available OBJETIVOS: Estimar o risco da transmissão materno-infantil (TMI do HIV no município de Santos e avaliar o efeito da introdução de medidas preventivas na transmissão vertical do HIV, tais como: utilização de AZT pela gestante, durante o pré-natal, trabalho de parto e parto, uso de AZT pelo recém-nascido; substituição do aleitamento natural pelo artificial e indicação de cesárea. MÉTODOS: Trata-se de um estudo de coorte. Os dados foram coletados dos prontuários das gestantes e das crianças nos serviços de referência para o atendimento de pessoas vivendo com HIV/Aids. Para estimar o risco de transmissão materno-infantil do HIV, dividiu-se o número de mães cujos filhos adquiriram o vírus por transmissão vertical pelo número de mães incluídas no estudo. Para estimar o risco de TMI associado aos fatores investigados, calcularam-se os riscos relativos com intervalos de confiança de 95% (IC 95%, considerando a ocorrência de transmissão como variável dependente e os outros fatores (idade materna, realização de pré-natal, uso de AZT oral, uso de AZT xarope, idade gestacional e amamentação como variáveis independentes. Para controlar o possível efeito confundidor de algumas variáveis, foi realizada análise estratificada pela técnica de Mantel-Haenszel. RESULTADOS: A ocorrência da TMI do HIV foi estabelecida em 144 crianças. Quatorze delas foram classificadas como infectadas; o risco de transmissão foi de 0,097 (IC 95%; 0,030-0,163. O risco de transmissão foi menor nas mulheres com menos de 30 anos de idade. Na análise univariada, o risco de transmissão materno-infantil do HIV esteve associado de modo estatisticamente significante com: idade materna, realização do pré-natal, uso de AZT oral, uso de AZT xarope, idade gestacional (Capurro e amamentação. CONCLUSÃO: O presente trabalho mostrou que a implantação de medidas preventivas tem importância na prevenção da transmissão do HIV mãe-filho, com

  14. Scanning transmission x-ray microscope for materials science spectromicroscopy at the ALS

    Energy Technology Data Exchange (ETDEWEB)

    Warwick, T.; Seal, S.; Shin, H. [Ernest Orlando Lawrence Berkeley National Lab., CA (United States)] [and others

    1997-04-01

    The brightness of the Advanced Light Source will be exploited by several new instruments for materials science spectromicroscopy over the next year or so. The first of these to become operational is a scanning transmission x-ray microscope with which near edge x-ray absorption spectra (NEXAFS) can be measured on spatial features of sub-micron size. Here the authors describe the instrument as it is presently implemented, its capabilities, some studies made to date and the developments to come. The Scanning Transmission X-ray Microscope makes use of a zone plate lens to produce a small x-ray spot with which to perform absorption spectroscopy through thin samples. The x-ray beam from ALS undulator beamline 7.0 emerges into the microscope vessel through a silicon nitride vacuum window 160nm thick and 300{mu}m square. The vessel is filled with helium at atmospheric pressure. The zone plate lens is illuminated 1mm downstream from the vacuum window and forms an image in first order of a pinhole which is 3m upstream in the beamline. An order sorting aperture passes the first order converging light and blocks the unfocused zero order. The sample is at the focus a few mm downstream of the zone plate and mounted from a scanning piezo stage which rasters in x and y so that an image is formed, pixel by pixel, by an intensity detector behind the sample. Absorption spectra are measured point-by-point as the photon energy is scanned by rotating the diffraction grating in the monochromator and changing the undulator gap.

  15. Determination of photon attenuation coefficient, porosity and field capacity of soil by gamma-ray transmission for 60, 356 and 662 keV gamma rays.

    Science.gov (United States)

    Demir, D; Un, A; Ozgül, M; Sahin, Y

    2008-12-01

    Gamma-ray transmission methods have been used accurately for the study of the properties of soil in the agricultural purposes. In this study, photon attenuation coefficient, porosity and field capacity of soil are determined by using gamma-ray transmission method. To this end, the soil sample was collected from Erzurum and a 2 x 2 in NaI (Tl) scintillation detector measured the attenuation of strongly collimated monoenergetic gamma beam through soil sample. The radioactive sources used in the experiment were (241)Am, (133)Ba and (137)Cs. The mass attenuation coefficients of dry soil samples were calculated from the transmission measurements. The soil samples were irrigated by adding known quantities of water and the soil-water properties were examined. It was observed that gamma-ray transmission method for determination of the soil parameters has advantages such as practical, inexpensive, non-destructive and fast analysis.

  16. Time-resolved X-ray transmission microscopy on magnetic microstructures; Zeitaufloesende Roentgentransmissionsmikroskopie an magnetischen Mikrostrukturen

    Energy Technology Data Exchange (ETDEWEB)

    Puzic, Aleksandar

    2007-10-23

    Three excitation schemes were designed for stroboscopic imaging of magnetization dynamics with time-resolved magnetic transmission X-ray microscopy (TR-MTXM). These techniques were implemented into two types of X-ray microscopes, namely the imaging transmission X-ray microscope (ITXM) and the scanning transmission X-ray microscope (STXM), both installed at the electron storage ring of the Advanced Light Source in Berkeley, USA. Circular diffraction gratings (Fresnel zone plates) used in both microscopes as focusing and imaging elements presently allow for lateral resolution down to 30 nm. Magnetic imaging is performed by using the X-ray magnetic circular dichroism (XMCD) as element specific contrast mechanism. The developed methods have been successfully applied to the experimental investigation of magnetization dynamics in ferromagnetic microstructures. A temporal resolution well below 100 ps was achieved. A conventional pump-probe technique was implemented first. The dynamic response of the magnetization excited by a broadband pulsed magnetic field was imaged spatially resolved using focused X-ray flashes. As a complementary method, the spatially resolved ferromagnetic resonance (SR-FMR) technique was developed for experimental study of magnetization dynamics in the frequency domain. As a third excitation mode, the burst excitation was implemented. The performance and efficiency of the developed methods have been demonstrated by imaging the local magnetization dynamics in laterally patterned ferromagnetic thin-film elements and three-layer stacks. The existence of multiple eigenmodes in the excitation spectra of ferromagnetic microstructures has been verified by using the pump-probe technique. Magnetostatic spin waves were selectively excited and detected with a time resolution of 50 ps using the SR-FMR technique. Thorough analysis of 20 in most cases independently prepared samples has verified that vortices which exhibit a low-amplitude switching of their core

  17. Transmission diffractive patterns of large microchannel plates at soft X-ray energies

    Science.gov (United States)

    Mazuritskiy, M. I.; Dabagov, S. B.; Lerer, A. M.; Dziedzic-Kocurek, K.; Sokolov, A.; Coreno, M.; Turchini, S.; D'Elia, A.; Sacchi, M.; Marcelli, A.

    2017-07-01

    In this contribution we compare experimental and theoretical diffractive patterns of Micro Channel Plates (MCPs) in transmission. We evaluate the transmission efficiency of different optical devices at different energies of the primary X-ray radiation in the normal incidence geometry. Data were collected performing angular scans of both the MCP device and of the detector in the range of a few degrees. We analyzed MCPs of 33 mm and 20 mm diameter and ∼300 μm thickness, having circular micro-channels of 3.4 μm directed normal to the MCP surface. Quite symmetric patterns of increasing complexity from high to low photon energy have been collected. Their shape and intensity are in reasonable agreement with preliminary simulations.

  18. Gamma ray transmission for hydraulic conductivity measurement of undisturbed soil columns

    Directory of Open Access Journals (Sweden)

    Anderson Camargo Moreira

    2007-03-01

    Full Text Available This work had the objective to determine the Hydraulic Conductivity K(theta function for different depth levels z, of columns of undisturbed soil, using the gamma ray transmission technique applied to the Sisson method. The results indicated a growing behavior for K(theta and a homogeneous soil density, both in relation to the increase of the depth. The methodology of gamma ray transmission showed satisfactory results on the determination of the hydraulic conductivity in columns of undisturbed soil, besides being very reliable and a nondestructive method.O estudo da condutividade hidráulica para solos não saturados é essencial quando aplicado às situações relacionadas à irrigação, drenagem e transporte de nutrientes no solo, é uma importante propriedade para desenvolvimentos de culturas agrícolas. Este trabalho tem o objetivo de determinar a função Condutividade Hidráulica K(teta, em diferentes níveis z de profundidade, em colunas de solo indeformado, utilizando a transmissão de raios gama aplicada ao método de Sisson. Os resultados indicam um comportamento crescente para K(teta e uma densidade de solo homogênea, ambos em relação ao aumento da profundidade. A metodologia de transmissão de raios gama mostrou resultados bastante satisfatórios na determinação da condutividade hidráulica em colunas de solo indeformado, além de ser muito confiável e não destrutivo.

  19. Using X-ray transmission/attenuation to quantify fluid absorption in cracked concrete

    DEFF Research Database (Denmark)

    Weiss, Jason; Geiker, Mette R.; Hansen, Kurt Kielsgaard

    2015-01-01

    Cracks can alter the rate of fluid transport in concrete. Unfortunately, however, quantitative information is lacking to provide definitive statements regarding the extent to which cracks reduce durability or long-term performance. This paper describes a study that used X-ray transmission....../attenuation to determine the influence of cracking on the absorption of fluid in concrete. Specifically, an experimental method is presented which uses a wedge splitting test to pre-crack specimens. These pre-cracked specimens were dried and ponded with water. At various times after the start of water ponding, X...... of the crack by using water absorption perimeter measurements of the wetting front in the concrete....

  20. Quantitative study of mammalian cells by scanning transmission soft X-ray microscopy

    Science.gov (United States)

    Shinohara, K.; Ohigashi, T.; Toné, S.; Kado, M.; Ito, A.

    2017-06-01

    Molecular distribution in mammalian cells was studied by soft X-ray scanning transmission microscopy with respect to the quantitative aspect of analysis. NEXAFS profiles at the C, N and O K-absorption edges were combined and used for the analysis. For the estimation of quantity for nucleic acids and proteins, NEXAFS profiles of DNA and bovine serum albumin (BSA) at the N K-absorption edge were applied assuming that those were their representatives. The method has a potential to explore the other molecular components than nucleic acids and proteins.

  1. A soft x-ray transmission grating imaging-spectrometer for the National Ignition Facility

    Energy Technology Data Exchange (ETDEWEB)

    Moore, A S; Guymer, T M; Kline, J L; Morton, J; Taccetti, M; Lanier, N E; Bentley, C; Workman, J; Peterson, B; Mussack, K; Cowan, J; Prasad, R; Richardson, M; Burns, S; Kalantar, D H; Benedetti, L R; Bell, P; Bradley, D; Hsing, W; Stevenson, M

    2012-05-01

    A soft x-ray transmission grating spectrometer has been designed for use on high energy-density physics experiments at the National Ignition Facility (NIF); coupled to one of the NIF gated x-ray detectors (GXD) it records sixteen time-gated spectra between 250 and 1000eV with 100ps temporal resolution. The trade-off between spectral and spatial resolution leads to an optimized design for measurement of emission around the peak of a 100-300eV blackbody spectrum. Performance qualification results from the NIF, the Trident Laser Facility and VUV beamline at the National Synchrotron Light Source (NSLS), evidence a <100{micro}m spatial resolution in combination with a source-size limited spectral resolution that is <10eV at photon energies of 300eV.

  2. An environmental sample chamber for reliable scanning transmission x-ray microscopy measurements under water vapor

    Energy Technology Data Exchange (ETDEWEB)

    Kelly, Stephen T.; Nigge, P.; Prakash, Shruti; Laskin, Alexander; Wang, Bingbing; Tyliszczak, Tolek; Leone, Stephen R.; Gilles, Mary K.

    2013-08-01

    We have designed, fabricated, and tested a compact gas-phase reactor for performing in situ soft x-ray scanning transmission x-ray microscopy (STXM) measurements. The reactor accommodates many gas atmospheres, including reactive or corrosive gasses, but was designed specically to address the needs of measurements under water vapor. An on-board sensor measures the relative humidity and temperature inside the reactor, minimizing uncertainties associated with measuring these quantities outside the instrument. The reactor mounts directly to the existing sample holder used in the majority of STXM instruments around the world and installs with minimal instrument reconguration. Using the reactor contributes over 85% less additional absorption compared to lling the STXM chamber with process gas, and results in much more stable imaging conditions. The reactor is in use at the STXM instruments at beamlines 11.0.2 and 5.3.2.2 at the Advanced Light Source.

  3. Transmission X-ray scattering as a probe for complex liquid-surface structures.

    Science.gov (United States)

    Fukuto, Masafumi; Yang, Lin; Nykypanchuk, Dmytro; Kuzmenko, Ivan

    2016-03-01

    The need for functional materials calls for increasing complexity in self-assembly systems. As a result, the ability to probe both local structure and heterogeneities, such as phase-coexistence and domain morphologies, has become increasingly important to controlling self-assembly processes, including those at liquid surfaces. The traditional X-ray scattering methods for liquid surfaces, such as specular reflectivity and grazing-incidence diffraction, are not well suited to spatially resolving lateral heterogeneities due to large illuminated footprint. A possible alternative approach is to use scanning transmission X-ray scattering to simultaneously probe local intermolecular structures and heterogeneous domain morphologies on liquid surfaces. To test the feasibility of this approach, transmission small- and wide-angle X-ray scattering (TSAXS/TWAXS) studies of Langmuir films formed on water meniscus against a vertically immersed hydrophilic Si substrate were recently carried out. First-order diffraction rings were observed in TSAXS patterns from a monolayer of hexagonally packed gold nanoparticles and in TWAXS patterns from a monolayer of fluorinated fatty acids, both as a Langmuir monolayer on water meniscus and as a Langmuir-Blodgett monolayer on the substrate. The patterns taken at multiple spots have been analyzed to extract the shape of the meniscus surface and the ordered-monolayer coverage as a function of spot position. These results, together with continual improvement in the brightness and spot size of X-ray beams available at synchrotron facilities, support the possibility of using scanning-probe TSAXS/TWAXS to characterize heterogeneous structures at liquid surfaces.

  4. Transmission X-ray scattering as a probe for complex liquid-surface structures

    Energy Technology Data Exchange (ETDEWEB)

    Fukuto, Masafumi; Yang, Lin; Nykypanchuk, Dmytro; Kuzmenko, Ivan

    2016-01-28

    The need for functional materials calls for increasing complexity in self-assembly systems. As a result, the ability to probe both local structure and heterogeneities, such as phase-coexistence and domain morphologies, has become increasingly important to controlling self-assembly processes, including those at liquid surfaces. The traditional X-ray scattering methods for liquid surfaces, such as specular reflectivity and grazing-incidence diffraction, are not well suited to spatially resolving lateral heterogeneities due to large illuminated footprint. A possible alternative approach is to use scanning transmission X-ray scattering to simultaneously probe local intermolecular structures and heterogeneous domain morphologies on liquid surfaces. To test the feasibility of this approach, transmission small- and wide-angle X-ray scattering (TSAXS/TWAXS) studies of Langmuir films formed on water meniscus against a vertically immersed hydrophilic Si substrate were recently carried out. First-order diffraction rings were observed in TSAXS patterns from a monolayer of hexagonally packed gold nanoparticles and in TWAXS patterns from a monolayer of fluorinated fatty acids, both as a Langmuir monolayer on water meniscus and as a Langmuir–Blodgett monolayer on the substrate. The patterns taken at multiple spots have been analyzed to extract the shape of the meniscus surface and the ordered-monolayer coverage as a function of spot position. These results, together with continual improvement in the brightness and spot size of X-ray beams available at synchrotron facilities, support the possibility of using scanning-probe TSAXS/TWAXS to characterize heterogeneous structures at liquid surfaces.

  5. Soft x-ray blazed transmission grating spectrometer with high resolving power and extended bandpass

    Science.gov (United States)

    Heilmann, Ralf K.; Bruccoleri, Alexander Robert; Schattenburg, Mark

    2016-04-01

    A number of high priority questions in astrophysics can be addressed by a state-of-the-art soft x-ray grating spectrometer, such as the role of Active Galactic Nuclei in galaxy and star formation, characterization of the Warm-Hot Intergalactic Medium and the “missing baryon” problem, characterization of halos around the Milky Way and nearby galaxies, as well as stellar coronae and surrounding winds and disks. An Explorer-scale, large-area (> 1,000 cm2), high resolving power (R = λ/Δλ > 3,000) soft x-ray grating spectrometer is highly feasible based on Critical-Angle Transmission (CAT) grating technology. Still significantly higher performance can be provided by a CAT grating spectrometer on an X-ray-Surveyor-type mission. CAT gratings combine the advantages of blazed reflection gratings (high efficiency, use of higher diffraction orders) with those of conventional transmission gratings (low mass, relaxed alignment tolerances and temperature requirements, transparent at higher energies) with minimal mission resource requirements. They are high-efficiency blazed transmission gratings that consist of freestanding, ultra-high aspect-ratio grating bars fabricated from silicon-on-insulator (SOI) wafers using advanced anisotropic dry and wet etch techniques. Blazing is achieved through grazing-incidence reflection off the smooth grating bar sidewalls. The reflection properties of silicon are well matched to the soft x-ray band. Nevertheless, CAT gratings with sidewalls made of higher atomic number elements allow extension of the CAT grating principle to higher energies and larger dispersion angles. We show x-ray data from metal-coated CAT gratings and demonstrate efficient blazing to higher energies and larger blaze angles than possible with silicon alone. We also report on measurements of the resolving power of a breadboard CAT grating spectrometer consisting of a Wolter-I slumped-glass focusing mirror pair from Goddard Space Flight Center and CAT gratings, to be

  6. Single x-ray transmission system for bone mineral density determination

    Science.gov (United States)

    Jimenez-Mendoza, Daniel; Espinosa-Arbelaez, Diego G.; Giraldo-Betancur, Astrid L.; Hernandez-Urbiola, Margarita I.; Vargas-Vazquez, Damian; Rodriguez-Garcia, Mario E.

    2011-12-01

    Bones are the support of the body. They are composed of many inorganic compounds and other organic materials that all together can be used to determine the mineral density of the bones. The bone mineral density is a measure index that is widely used as an indicator of the health of the bone. A typical manner to evaluate the quality of the bone is a densitometry study; a dual x-ray absorptiometry system based study that has been widely used to assess the mineral density of some animals' bones. However, despite the success stories of utilizing these systems in many different applications, it is a very expensive method that requires frequent calibration processes to work properly. Moreover, its usage in small species applications (e.g., rodents) has not been quite demonstrated yet. Following this argument, it is suggested that there is a need for an instrument that would perform such a task in a more reliable and economical manner. Therefore, in this paper we explore the possibility to develop a new, affordable, and reliable single x-ray absorptiometry system. The method consists of utilizing a single x-ray source, an x-ray image sensor, and a computer platform that all together, as a whole, will allow us to calculate the mineral density of the bone. Utilizing an x-ray transmission theory modified through a version of the Lambert-Beer law equation, a law that expresses the relationship among the energy absorbed, the thickness, and the absorption coefficient of the sample at the x-rays wavelength to calculate the mineral density of the bone can be advantageous. Having determined the parameter equation that defines the ratio of the pixels in radiographies and the bone mineral density [measured in mass per unit of area (g/cm2)], we demonstrated the utility of our novel methodology by calculating the mineral density of Wistar rats' femur bones.

  7. Single x-ray transmission system for bone mineral density determination

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez-Mendoza, Daniel; Vargas-Vazquez, Damian [Division de Investigacion y Posgrado, Facultad de Ingenieria, Universidad Autonoma de Queretaro, Cerro de las Campanas s/n., C.P. 76010, Queretaro, Qro. (Mexico); Espinosa-Arbelaez, Diego G. [Posgrado en Ciencia e Ingenieria en Materiales, Instituto de Investigaciones en Materiales, Universidad Nacional Autonoma de Mexico, Av. Universidad 3000, C.P. 04510, Coyoacan, Mexico D.F. (Mexico); Departamento de Nanotecnologia, Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico, Campus Juriquilla, Boulevard Juriquilla 3001, C.P. 76230, A.P. 1-1010, Juriquilla, Qro. (Mexico); Giraldo-Betancur, Astrid L. [Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Libramiento Norponiente 2000, C.P. 76230, Fracc. Real de Juriquilla, Qro. (Mexico); Hernandez-Urbiola, Margarita I. [Posgrado en Investigaciones Biomedicas, Universidad Nacional Autonoma de Mexico, Campus Juriquilla, Boulevard Juriquilla 3001, C.P. 76230, A.P. 1-1010, Juriquilla, Qro. (Mexico); Departamento de Nanotecnologia, Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico, Campus Juriquilla, Boulevard Juriquilla 3001, C.P. 76230, A.P. 1-1010, Juriquilla, Qro. (Mexico); Rodriguez-Garcia, Mario E. [Departamento de Nanotecnologia, Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico, Campus Juriquilla, Boulevard Juriquilla 3001, C.P. 76230, A.P. 1-1010, Juriquilla, Qro. (Mexico)

    2011-12-15

    Bones are the support of the body. They are composed of many inorganic compounds and other organic materials that all together can be used to determine the mineral density of the bones. The bone mineral density is a measure index that is widely used as an indicator of the health of the bone. A typical manner to evaluate the quality of the bone is a densitometry study; a dual x-ray absorptiometry system based study that has been widely used to assess the mineral density of some animals' bones. However, despite the success stories of utilizing these systems in many different applications, it is a very expensive method that requires frequent calibration processes to work properly. Moreover, its usage in small species applications (e.g., rodents) has not been quite demonstrated yet. Following this argument, it is suggested that there is a need for an instrument that would perform such a task in a more reliable and economical manner. Therefore, in this paper we explore the possibility to develop a new, affordable, and reliable single x-ray absorptiometry system. The method consists of utilizing a single x-ray source, an x-ray image sensor, and a computer platform that all together, as a whole, will allow us to calculate the mineral density of the bone. Utilizing an x-ray transmission theory modified through a version of the Lambert-Beer law equation, a law that expresses the relationship among the energy absorbed, the thickness, and the absorption coefficient of the sample at the x-rays wavelength to calculate the mineral density of the bone can be advantageous. Having determined the parameter equation that defines the ratio of the pixels in radiographies and the bone mineral density [measured in mass per unit of area (g/cm{sup 2})], we demonstrated the utility of our novel methodology by calculating the mineral density of Wistar rats' femur bones.

  8. Effect of common building materials in narrow shaped X-ray fields transmission

    Science.gov (United States)

    Vlachos, I.; Tsantilas, X.; Fountos, G.; Delis, H.; Kandarakis, I.; Panayiotakis, G.

    2015-09-01

    Diagnostic and interventional radiology, are an essential part of present day medical practice. Advances in X-ray imaging technology, together with developments in digital imaging have had a significant impact on the practice of radiology. This includes improvement in image quality, reduction in dose and a broader range of available applications resulting to better patient diagnosis and treatment. X-rays have the potential for damaging healthy cells and tissues, therefore all medical procedures employing X-ray equipment must be carefully managed. In all facilities and for all equipment types, procedures must be in place in order to ensure that exposures to patients, staff and the public are kept as low as reasonably achievable. Commonly used construction materials such as, ceramic tiles and plasterboards can provide a certain degree of protection against X-radiation. In this study, the secondary radiation transmission through common building materials is investigated, in the case of narrow shaped X-ray fields. Double plasterboard and double reinforced in thickness ceramic tile provided better radiation protection results.

  9. Studies of soft x-ray transmission through grid supported CH layers

    Science.gov (United States)

    Davis, J. S.; Keiter, P. A.; Klein, S. R.; Frank, Y.; Drake, R. P.; Shvarts, D.

    2017-10-01

    Recent experiments have shown that it may be possible to use laser-heated high-Z foils to drive new radiation transport (RadTran) experiments in gas fill tubes. These tubes must be pressurized above 1atm and the x-ray source needs to be physically separated from the gas. To achieve this, a grid-supported CH seal is implemented. The grid reduces the total surface area of the gas-seal interaction region lowering the thickness requirements for the CH layer. However, as mesh spacing is reduced, hole closure from wire ablation may reduce the x-ray flux. To optimize the seal design, experiments were performed measuring x-ray transmission through CH layers supported by meshes composed of copper, gold, or stainless steel and using hexagonal or square mesh geometries. The x-ray source was formed by heating a 0.5 μm thick planar gold foil with a 4 ns laser pulse at an intensity of 2 ×1014 W / cm 2. Emission data was collected using an x-ray framing camera and a Dante photodiode array. Experiments show that the CH layers can reach effective temperatures of nearly 100 eV but mesh design significantly affects performance, with a nearly 20 eV difference between the best and worst performing seal targets. This talk will discuss our findings and their impact on future RadTran experiments. This work is funded by the U.S. DOE, through the NNSA-DS and SC-OFES Joint Program in HED Laboratory Plasmas, Grant Number DE-NA0001840, the National LUFP, Grant Number DE-NA0000850, and through NNSA/OICF under Cooperatvie Agreement No. DE-FC52-08NA2830.

  10. X-ray Interferometry with Transmissive Beam Combiners for Ultra-High Angular Resolution Astronomy

    Science.gov (United States)

    Skinner, G. K.; Krismanic, John F.

    2009-01-01

    Abstract Interferometry provides one of the possible routes to ultra-high angular resolution for X-ray and gamma-ray astronomy. Sub-micro-arc-second angular resolution, necessary to achieve objectives such as imaging the regions around the event horizon of a super-massive black hole at the center of an active galaxy, can be achieved if beams from parts of the incoming wavefront separated by 100s of meters can be stably and accurately brought together at small angles. One way of achieving this is by using grazing incidence mirrors. We here investigate an alternative approach in which the beams are recombined by optical elements working in transmission. It is shown that the use of diffractive elements is a particularly attractive option. We report experimental results from a simple 2-beam interferometer using a low-cost commercially available profiled film as the diffractive elements. A rotationally symmetric filled (or mostly filled) aperture variant of such an interferometer, equivalent to an X-ray axicon, is shown to offer a much wider bandpass than either a Phase Fresnel Lens (PFL) or a PFL with a refractive lens in an achromatic pair. Simulations of an example system are presented.

  11. Transmission x-ray microscopy at Diamond-Manchester I13 Imaging Branchline

    Energy Technology Data Exchange (ETDEWEB)

    Vila-Comamala, Joan, E-mail: joan.vila.comamala@gmail.com; Wagner, Ulrich; Bodey, Andrew J.; Garcia-Fernandez, Miryam; Rau, Christoph [Diamond Light Source Ltd, Harwell Science and Innovation Campus, Didcot OX11 0DE (United Kingdom); Bosgra, Jeroen; David, Christian [Paul Scherrer Institut, 5232 PSI-Villigen (Switzerland); Eastwood, David S. [Manchester X-ray Imaging Facility, School of Materials, University of Manchester, Manchester M13 9PL, UK and Research Complex at Harwell, Harwell Campus, Didcot OX11 0FA (United Kingdom)

    2016-01-28

    Full-field Transmission X-ray Microscopy (TXM) has been shown to be a powerful method for obtaining quantitative internal structural and chemical information from materials at the nanoscale. The installation of a Full-field TXM station will extend the current microtomographic capabilities of the Diamond-Manchester I13 Imaging Branchline at Diamond Light Source (UK) into the sub-100 nm spatial resolution range using photon energies from 8 to 14 keV. The dedicated Full-field TXM station will be built in-house with contributions of Diamond Light Source support divisions and via collaboration with the X-ray Optics Group of Paul Scherrer Institut (Switzerland) which will develop state-of-the-art diffractive X-ray optical elements. Preliminary results of the I13 Full-field TXM station are shown. The Full-field TXM will become an important Diamond Light Source direct imaging asset for material science, energy science and biology at the nanoscale.

  12. Transmission x-ray microscopy at Diamond-Manchester I13 Imaging Branchline

    Science.gov (United States)

    Vila-Comamala, Joan; Bosgra, Jeroen; Eastwood, David S.; Wagner, Ulrich; Bodey, Andrew J.; Garcia-Fernandez, Miryam; David, Christian; Rau, Christoph

    2016-01-01

    Full-field Transmission X-ray Microscopy (TXM) has been shown to be a powerful method for obtaining quantitative internal structural and chemical information from materials at the nanoscale. The installation of a Full-field TXM station will extend the current microtomographic capabilities of the Diamond-Manchester I13 Imaging Branchline at Diamond Light Source (UK) into the sub-100 nm spatial resolution range using photon energies from 8 to 14 keV. The dedicated Full-field TXM station will be built in-house with contributions of Diamond Light Source support divisions and via collaboration with the X-ray Optics Group of Paul Scherrer Institut (Switzerland) which will develop state-of-the-art diffractive X-ray optical elements. Preliminary results of the I13 Full-field TXM station are shown. The Full-field TXM will become an important Diamond Light Source direct imaging asset for material science, energy science and biology at the nanoscale.

  13. An angle-dependent estimation of CT x-ray spectrum from rotational transmission measurements.

    Science.gov (United States)

    Lin, Yuan; Ramirez-Giraldo, Juan Carlos; Gauthier, Daniel J; Stierstorfer, Karl; Samei, Ehsan

    2014-06-01

    Computed tomography (CT) performance as well as dose and image quality is directly affected by the x-ray spectrum. However, the current assessment approaches of the CT x-ray spectrum require costly measurement equipment and complicated operational procedures, and are often limited to the spectrum corresponding to the center of rotation. In order to address these limitations, the authors propose an angle-dependent estimation technique, where the incident spectra across a wide range of angular trajectories can be estimated accurately with only a single phantom and a single axial scan in the absence of the knowledge of the bowtie filter. The proposed technique uses a uniform cylindrical phantom, made of ultra-high-molecular-weight polyethylene and positioned in an off-centered geometry. The projection data acquired with an axial scan have a twofold purpose. First, they serve as a reflection of the transmission measurements across different angular trajectories. Second, they are used to reconstruct the cross sectional image of the phantom, which is then utilized to compute the intersection length of each transmission measurement. With each CT detector element recording a range of transmission measurements for a single angular trajectory, the spectrum is estimated for that trajectory. A data conditioning procedure is used to combine information from hundreds of collected transmission measurements to accelerate the estimation speed, to reduce noise, and to improve estimation stability. The proposed spectral estimation technique was validated experimentally using a clinical scanner (Somatom Definition Flash, Siemens Healthcare, Germany) with spectra provided by the manufacturer serving as the comparison standard. Results obtained with the proposed technique were compared against those obtained from a second conventional transmission measurement technique with two materials (i.e., Cu and Al). After validation, the proposed technique was applied to measure spectra from the

  14. Optical transmission of glass for the National Ignition Facility near backscatter imagers under x-ray exposurea)

    Science.gov (United States)

    London, R. A.; Froula, D. H.; Sorce, C. M.; Moody, J. D.; Suter, L. J.; Glenzer, S. H.; Jones, O. S.; Meezan, N. B.; Rosen, M. D.

    2008-10-01

    In experiments at the National Ignition Facility (NIF), the near backscatter imager materials need to maintain high optical transmission while exposed to hohlraum generated x rays. Glass plates are incorporated in the design to protect the optical scattering plates from x-ray damage. Radiation environments spanning those expected on NIF have been produced at the Omega Laser Facility by symmetric laser illumination of 1mm sized gold spheres. The time-dependent ultraviolet transmission of sample glass plates was measured. The data are interpreted with a free electron absorption model. Combined with the simulations of the hohlraum x-ray emission, this model is used to predict the transmission of the glass plates on the NIF. We predict that the plates should perform adequately up to the peak of the laser pulse.

  15. Design and performance of a compact scanning transmission X-ray microscope at the Photon Factory

    Energy Technology Data Exchange (ETDEWEB)

    Takeichi, Y., E-mail: yasuo.takeichi@kek.jp; Mase, K.; Ono, K. [Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba 305-0801 (Japan); Department of Materials Structure Science, SOKENDAI (The Graduate University for Advanced Studies), 1-1 Oho, Tsukuba 305-0801 (Japan); Inami, N. [Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba 305-0801 (Japan); Suga, H. [Department of Earth and Planetary Systems Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526 (Japan); Miyamoto, C. [Department of Earth and Planetary Systems Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku 113-0033 (Japan); Ueno, T. [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047 (Japan); Takahashi, Y. [Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba 305-0801 (Japan); Department of Earth and Planetary Systems Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526 (Japan); Department of Earth and Planetary Systems Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku 113-0033 (Japan)

    2016-01-15

    We present a new compact instrument designed for scanning transmission X-ray microscopy. It has piezo-driven linear stages, making it small and light. Optical components from the virtual source point to the detector are located on a single optical table, resulting in a portable instrument that can be operated at a general-purpose spectroscopy beamline without requiring any major reconstruction. Careful consideration has been given to solving the vibration problem common to high-resolution microscopy, so as not to affect the spatial resolution determined by the Fresnel zone plate. Results on bacteriogenic iron oxides, single particle aerosols, and rare-earth permanent magnets are presented as examples of its performance under diverse applications.

  16. In situ azimuthal rotation device for linear dichroism measurements in scanning transmission x-ray microscopy

    Science.gov (United States)

    Hernández-Cruz, D.; Hitchcock, A. P.; Tyliszczak, T.; Rousseau, M.-E.; Pézolet, M.

    2007-03-01

    A novel miniature rotation device used in conjunction with a scanning transmission x-ray microscope is described. It provides convenient in situ sample rotation to enable measurements of linear dichroism at high spatial resolution. The design, fabrication, and mechanical characterization are presented. This device has been used to generate quantitative maps of the spatial distribution of the orientation of proteins in several different spider and silkworm silks. Specifically, quantitative maps of the dichroic signal at the C 1s→π*amide transition in longitudinal sections of the silk fibers give information about the spatial orientation, degree of alignment, and spatial distribution of protein peptide bonds. A new approach for analyzing the dichroic signal to extract orientation distributions, in addition to magnitudes of aligned components, is presented and illustrated with results from Nephila clavipes dragline spider silk measured using the in situ rotation device.

  17. Automated correction on X-rays calibration using transmission chamber and LabVIEW{sup TM}

    Energy Technology Data Exchange (ETDEWEB)

    Betti, Flavio; Potiens, Maria da Penha Albuquerque, E-mail: fbetti@ipen.b, E-mail: mppalbu@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2009-07-01

    Uncertainties during prolonged exposure times on X-rays calibration procedures at the Instruments Calibration facilities at IPEN may suffer from efficiency (and therefore intensity) variations on the industrial X-Ray generator used. Using a transmission chamber as an online reference chamber during the whole irradiation process is proposed in order to compensate for such error source. Also temperature (and pressure) fluctuations may arise from the performance limited calibration room air conditioning system. As an open ionization chamber, that monitor chamber does require calculation of a correction factor due to the temperature and pressure effects on air density. Sending and processing data from all related instruments (electrometer, thermometer and barometer) can be more easily achieved by interfacing them to a host computer running an especially developed algorithm using LabVIEW{sup TM} environment which will not only apply the proper correction factors during runtime, but also determine the exact length of time to reach a desired condition, which can be: time period, charge collected, or air kerma, based on the previous calibration of the whole system using a reference chamber traceable to primary standard dosimetry laboratories. When performing such calibration, two temperature sensors (secondary standard thermistors) are simultaneously used, one for the transmission chamber, and other for the reference chamber. As the substitution method is used during actual customer's calibration, the readings from the second thermistor can also be used when desired for further corrections. Use of LabVIEW{sup TM} programming language allowed for a shorter development time, and it is also extremely convenient to make things easier when improvements and modifications are called for. (author)

  18. Advancement of Solidification Processing Technology Through Real Time X-Ray Transmission Microscopy: Sample Preparation

    Science.gov (United States)

    Stefanescu, D. M.; Curreri, P. A.

    1996-01-01

    Two types of samples were prepared for the real time X-ray transmission microscopy (XTM) characterization. In the first series directional solidification experiments were carried out to evaluate the critical velocity of engulfment of zirconia particles in the Al and Al-Ni eutectic matrix under ground (l-g) conditions. The particle distribution in the samples was recorded on video before and after the samples were directionally solidified. In the second series samples of the above two type of composites were prepared for directional solidification runs to be carried out on the Advanced Gradient Heating Facility (AGHF) aboard the space shuttle during the LMS mission in June 1996. X-ray microscopy proved to be an invaluable tool for characterizing the particle distribution in the metal matrix samples. This kind of analysis helped in determining accurately the critical velocity of engulfment of ceramic particles by the melt interface in the opaque metal matrix composites. The quality of the cast samples with respect to porosity and instrumented thermocouple sheath breakage or shift could be easily viewed and thus helped in selecting samples for the space shuttle experiments. Summarizing the merits of this technique it can be stated that this technique enabled the use of cast metal matrix composite samples since the particle location was known prior to the experiment.

  19. Medidas difusas e integrales difusas

    Directory of Open Access Journals (Sweden)

    Gilberto Arenas-Díaz

    2013-04-01

    Full Text Available Presentar un estudio de las medidas difusas y de las integrales difusas, y mostrar algunos fenómenos donde estas son utilizadas. Se expone cómo es introducido el concepto de medida difusa y cómo a partir de él se introduce la noción de integral difusa. Se establecen propiedades de las medidas difusas y se clasifican de acuerdo a la propiedad aditiva y las λ-medidas, se observa cómo las medidas de probabilidad, plausibilidad, credibilidad, posibilidad y necesidad son ejemplos clásicos en la clasificación realizada. Se hace un análisis de las dos principales integrales difusas: integral de Sugeno e integral de Choquet, dado que la aplicación de estas integrales se hace sobre conjuntos finitos, se realiza utilizando el concepto de función equiordenada una comparación de ellas para el caso finito. Se presentan dos ejemplos donde se utilizan las medidas difusas e integrales difusas en los procesos de clasificación de individuos y evaluación de calidad. También se describen algunos fenómenos donde ellas son aplicadas. Las medidas clásicas son usadas en ciertos casos especiales de incertidumbre basados en la aleatoriedad. La utilización en determinados contextos de medidas difusas (no aditivas y de las integrales difusas ofrece un enfoque más flexible y realista para modelar la incertidumbre.

  20. Quantifying vertical stress transmission and compaction-induced soil structure using sensor mat and X-ray computed tomography

    DEFF Research Database (Denmark)

    Naveed, Muhammad; Schjønning, Per; Keller, Thomas

    2016-01-01

    Accurate estimation of stress transmission in soil and quantification of compaction-induced soil pore structure is important for efficient soil use and management. Continuum mechanics have so far mostly been applied for agricultural soils, even if topsoil structure is aggregated due to regular...... tillage. In this study, partially confined uniaxial compression tests were carried out on intact topsoil columns placed on subsoil columns. Two methods were employed for estimation of stress transmission in soil: (i) soil deformation patterns were quantified using X-ray CT and converted to stress...... distributions, and (ii) a tactile sensor mat was employed for measuring stresses at the interface of the topsoil and subsoil columns. The resulting soil pore structure under applied stresses was quantified using X-ray CT and by air-permeability measurements. In topsoil discrete stress transmission patterns were...

  1. Model of a catalytic injection in a riser by means of gamma ray transmission measurements

    Energy Technology Data Exchange (ETDEWEB)

    Moura, Alex E.; Brito, Macio F.P.; Dantas, Carlos C.; Melo, Silvio B., E-mail: alex.emoura@ufpe.br, E-mail: sbm@ufpe.br [Universidade Federal de Pernambuco (DEN/UFPE), Recife, PE (Brazil); Barbosa, Enivaldo S., E-mail: Enivaldo.santos@ufcg.edu.br [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Departamento de Engenharia Mecanica; Lima, Emerson A.O., E-mail: eal@poli.br [Universidade de Pernambuco, Recife, PE (Brazil). Departamento de Matematica

    2015-07-01

    In Gas solid process involving a solid circulation through a closed loop the knowledge of the Solids Circulation Rate (SCR) is fundamental to control and improve the operation of a circulating fluidized bed system. A valve controls the circulation rate of solids in the riser of a fluid catalytic cracking unit. Initially, to control the catalyst injection in the riser, a rotary valve controlled and measured solid flow injection, but with a limited working time. Due to the fine powder catalyst abrasive action on the valve steel axis, this device stop work. A lab made valve were design to avoiding direct contact of the catalyst with mechanical moving parts in while control solid injection in riser, but do not measure the solid flow like the rotary valve. To control the lab made device a fixed pressure measurement at riser bottom is provided by control setup which corresponds to a given mass/time solid injection. In the present work, we proposed a method to evaluate the control valve based on a non-invasive technique. With gamma ray transmission measurements, in a cross section of the pipe, we developed a model that was used in the control system of the Cold Pilot Unit (CPU). Therefore, the interaction of the gamma ray with solid flow in riser should yield the necessary information for the process control system. A first model approximation consider the solid flow rate injection and solid velocity in riser as proposed in literature. In the CPU control system a Programmable Logic Controller-PLC keeps steady state processing the airflow, pressure profile and solid flow inputs. Additionally to preexisting PLC platform, some LabVIEW algorithms were implemented to achieve a good system performance operational condition. (author)

  2. Transmission X-ray Microscopy—A New Tool in Clay Mineral Floccules Characterization

    Directory of Open Access Journals (Sweden)

    Ray L. Frost

    2012-10-01

    Full Text Available Effective flocculation and dewatering of mineral processing streams containing clays are microstructure dependent in clay-water systems. Initial clay flocculation is crucial in the design and for the development of a new methodology of gas exploitation. Microstructural engineering of clay aggregates using covalent cations and Keggin macromolecules have been monitored using the new state of the art Transmission X-ray Microscope (TXM with 60 nm tomography resolution installed in a Taiwanese synchrotron. The 3-D reconstructions from TXM images show complex aggregation structures in montmorillonite aqueous suspensions after treatment with Na+, Ca2+ and Al13 Keggin macromolecules. Na-montmorillonite displays elongated, parallel, well-orientated and closed-void cellular networks, 0.5–3 µm in diameter. After treatment by covalent cations, the coagulated structure displays much smaller, randomly orientated and openly connected cells, 300–600 nm in diameter. The average distances measured between montmorillonite sheets was around 450 nm, which is less than half of the cell dimension measured in Na-montmorillonite. The most dramatic structural changes were observed after treatment by Al13 Keggin; aggregates then became arranged in compacted domains of a 300 nm average diameter composed of thick face-to-face oriented sheets, which forms porous aggregates with larger intra-aggregate open and connected voids.

  3. Design of Time-Resolved Shifted Dual Transmission Grating Spectrometer for the X-Ray Spectrum Diagnostics

    Science.gov (United States)

    Wang, Baoqing; Yi, Tao; Wang, Chuanke; Zhu, Xiaoli; Li, Tingshuai; Li, Jin; Liu, Shenye; Jiang, Shaoen; Ding, Yongkun

    2016-07-01

    A new time-resolved shifted dual transmission grating spectrometer (SDTGS) is designed and fabricated in this work. This SDTGS uses a new shifted dual transmission grating (SDTG) as its dispersive component, which has two sub transmission gratings with different line densities, of 2000 lines/mm and 5000 lines/mm. The axes of the two sub transmission gratings in SDTG are horizontally and vertically shifted a certain distance to measure a broad range of 0.1-5 keV time-resolved X-ray spectra. The SDTG has been calibrated with a soft X-ray beam of the synchrotron radiation facility and its diffraction efficiency is also measured. The designed SDTGS can take full use of the space on a record panel and improve the precision for measuring spatial and temporal spectrum simultaneously. It will be a promising application for accurate diagnosis of the soft X-ray spectrum in inertial confinement fusion. supported by National Natural Science Foundation of China (Nos. 11405158 and 11435011) and Development Foundation of China Academy of Engineering Physics (Nos. 2014B0102011 and 2014B0102012)

  4. Probing the electronic structure of graphene sheets with various thicknesses by scanning transmission X-ray microscopy

    Energy Technology Data Exchange (ETDEWEB)

    Bai, Lili; Liu, Jinyin; Zhao, Guanqi; Gao, Jing; Sun, Xuhui, E-mail: xhsun@suda.edu.cn, E-mail: jzhong@suda.edu.cn; Zhong, Jun, E-mail: xhsun@suda.edu.cn, E-mail: jzhong@suda.edu.cn [Soochow University-Western University Centre for Synchrotron Radiation Research, Institute of Functional Nano and Soft Materials Laboratory (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123 (China)

    2013-12-16

    The electronic structure of an aggregation of graphene sheets with various thicknesses was probed by scanning transmission X-ray microscopy. A uniform oxidation of the graphene sheets in the flat area was observed regardless of the thickness, while in the folded area the result could be strongly affected by the geometry. Moreover, thick parts of the aggregation showed strong angle-dependence to the incident X-ray, while thin parts showed less angle-dependence, which might be related to the surface wrinkles and ripples. The electronic structure differences due to the geometry and thickness suggest a complicated situation in the aggregation of graphene sheets.

  5. Nephila clavipes spider dragline silk microstructure studied by scanning transmission X-ray microscopy.

    Science.gov (United States)

    Rousseau, Marie-Eve; Hernández Cruz, Daniel; West, M Marcia; Hitchcock, Adam P; Pézolet, Michel

    2007-04-04

    Nephila clavipes dragline silk microstructure has been investigated by scanning transmission X-ray microscopy (STXM), a technique that allows quantitative mapping of the level of orientation of the peptide groups at high spatial resolution (<50 nm). Maps of the orientation parameter P2 have been derived for spider silk for the first time. Dragline silk presents a very fine microstructure in which small, highly oriented domains (average area of 1800 nm2, thus clearly bigger than individual beta-sheet crystallites) are dispersed in a dominant, moderately oriented matrix with several small unoriented domains. Our results also highlight the orientation of the noncrystalline fraction in silk, which has been underestimated in numerous structural models. No evidence of either a regular lamellar structure or any periodicity along the fiber was observed at this spatial resolution. The surface of fresh spider silk sections consists of a approximately 30-120 nm thick layer of highly oriented protein chains, which was found to vary with the reeling speed, where web building (0.5 cm/s) and lifeline (10 cm/s) spinning speeds were investigated. While the average level of orientation of the protein chains is unaffected by the spinning speed, STXM measurements clearly highlight microstructure differences. The slowpull fiber contains a larger fraction of highly oriented domains, while the protein chains are more homogeneously oriented in the fastpull fiber. In comparison, cocoon silk from the silkworm Bombyx mori presents a narrower orientation distribution. The strength-extensibility combination found in spider dragline silk is associated with its broad orientation distribution of highly interdigitated and unoriented domains.

  6. Small angle X-ray scattering and transmission electron microscopy study of the Lactobacillus brevis S-layer protein

    Science.gov (United States)

    Jääskeläinen, Pentti; Engelhardt, Peter; Hynönen, Ulla; Torkkeli, Mika; Palva, Airi; Serimaa, Ritva

    2010-10-01

    The structure of self-assembly domain containing recombinant truncation mutants of Lactobacillus brevis surface layer protein SlpA in aqueous solution was studied using small-angle X-ray scattering and transmission electron microscopy. The proteins were found out to interact with each other forming stable globular oligomers of about 10 monomers. The maximum diameter of the oligomers varied between 75 Å and 435 Å.

  7. Small angle X-ray scattering and transmission electron microscopy study of the Lactobacillus brevis S-layer protein

    Energy Technology Data Exchange (ETDEWEB)

    Jaeaeskelaeinen, Pentti [Department of Biomedical Engineering and Computational Science, PO Box 2200, FI-02015 Aalto University School of Science and Technology (Finland); Engelhardt, Peter [Haartman Institute, Department of Pathology, PO Box 21, FIN-00014 University of Helsinki (Finland); Hynoenen, Ulla; Palva, Airi [Department of Basic Veterinary Sciences, Division of Microbiology, FIN-00014 University of Helsinki (Finland); Torkkeli, Mika; Serimaa, Ritva, E-mail: ritva.serimaa@helsinki.f [Department of Physics, POB 64, 00014 University of Helsinki (Finland)

    2010-10-01

    The structure of self-assembly domain containing recombinant truncation mutants of Lactobacillus brevis surface layer protein SlpA in aqueous solution was studied using small-angle X-ray scattering and transmission electron microscopy. The proteins were found out to interact with each other forming stable globular oligomers of about 10 monomers. The maximum diameter of the oligomers varied between 75 A and 435 A.

  8. Multispecies Biofilms Transform Selenium Oxyanions into Elemental Selenium Particles: Studies Using Combined Synchrotron X-ray Fluorescence Imaging and Scanning Transmission X-ray Microscopy

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Soo In; George, Graham N.; Lawrence, John R.; Kaminskyj, Susan G. W.; Dynes, James J.; Lai, Barry; Pickering, Ingrid J.

    2016-10-04

    Selenium (Se) is an element of growing environmental concern, because low aqueous concentrations can lead to biomagnification through the aquatic food web. Biofilms, naturally occurring microbial consortia, play numerous important roles in the environment, especially in biogeochemical cycling of toxic elements in aquatic systems. The complexity of naturally forming multispecies biofilms presents challenges for characterization because conventional microscopic techniques require chemical and physical modifications of the sample. Here, multispecies biofilms biotransforming selenium oxyanions were characterized using X-ray fluorescence imaging (XFI) and scanning transmission X-ray microscopy (STXM). These complementary synchrotron techniques required minimal sample preparation and were applied correlatively to the same biofilm areas. Sub-micrometer XFI showed distributions of Se and endogenous metals, while Se K-edge X-ray absorption spectroscopy indicated the presence of elemental Se (Se0). Nanoscale carbon K-edge STXM revealed the distributions of microbial cells, extracellular polymeric substances (EPS), and lipids using the protein, saccharide, and lipid signatures, respectively, together with highly localized Se0 using the Se LIII edge. Transmission electron microscopy showed the electron-dense particle diameter to be 50–700 nm, suggesting Se0 nanoparticles. The intimate association of Se0 particles with protein and polysaccharide biofilm components has implications for the bioavailability of selenium in the environment.

  9. Medidas antidumping : instrumento del neoproteccionismo

    OpenAIRE

    Gutiérrez Solsona, Fernando

    1994-01-01

    El objetivo fundamental de este trabajo se puede expresar fácilmente: demostrar que las medidas antidumping, que hoy en día son tan utilizadas por la Unión Europea (U.E.) y por los Estados Unidos (EE. UU.), tienen exclusivamente un fin proteccionista. Proteccionismo entendido en el sentido económico, esto es proteger a los sectores nacionales frente a la competencia extranjera, porque los primeros son menos eficientes que los segundos.

  10. Characterization of the Carancas-Puno meteorite by energy dispersive X-ray fluorescence, X-ray diffractometry and transmission Moessbauer spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Ceron Loayza, Maria L., E-mail: malucelo@hotmail.com; Bravo Cabrejos, Jorge A. [Universidad Nacional Mayor de San Marcos, Laboratorio de Analisis de Suelos, Facultad de Ciencias Fisicas (Peru)

    2011-11-15

    We report the results of the study of a meteorite that impacted an inhabited zone on 15 September 2007 in the neighborhood of the town of Carancas, Puno Region, about 1,300 km south of Lima. The analysis carried out by energy dispersive X-ray fluorescence, X-ray diffractometry and transmission Moessbauer spectroscopy (at room temperature and at 4.2 K), reveal the presence in the meteorite sample of magnetic sites assigned to taenite (Fe,Ni) and troilite (Fe,S) phases, and of two paramagnetic doublets assigned to Fe{sup 2 + }, one associated with olivine and the other to pyroxene. In accord with these results, this meteorite is classified as a type IV chondrite meteorite.

  11. Delayed Fission Product Gamma-Ray Transmission Through Low Enriched UO2 Fuel Pin Lattices in Air

    Energy Technology Data Exchange (ETDEWEB)

    Trumbull, TH [Rensselaer Polytechnic Inst., Troy, NY (United States)

    2004-10-18

    The transmission of delayed fission-product gamma rays through various arrangements of low-enriched UO2 fuel pin lattices in an air medium was studied. Experimental measurements, point-kernel and Monte Carlo photon transport calculations were performed to demonstrate the shielding effect of ordered lattices of fuel pins on the resulting gamma-ray dose to a detector outside the lattice. The variation of the gamma-ray dose on the outside of the lattice as a function of radial position, the so-called “channeling” effect, was analyzed. Techniques for performing experimental measurements and data reduction at Rensselaer Polytechnic Institute’s Reactor Critical Facility (RCF) were derived. An experimental apparatus was constructed to hold the arrangements of fuel pins for the measurements. A gamma-ray spectroscopy system consisting of a sodium-iodide scintillation detector was used to collect data. Measurements were made with and without a collimator installed. A point-kernel transport code was developed to map the radial dependence of the gamma-ray flux. Input files for the Monte Carlo code, MCNP, were also developed to accurately model the experimental measurements. The results of the calculations were compared to the experimental measurements. In order to determine the delayed fission-product gamma-ray source for the calculations, a technique was developed using a previously written code, DELBG and the reactor state-point data obtained during the experimental measurements. Calculations were performed demonstrating the effects of material homogenization on the gamma-ray transmission through the fuel pin lattice.Homogeneous and heterogeneous calculations were performed for all RCF fuel pin lattices as well as for a typical commercial pressurized water reactor fuel bundle. The results of the study demonstrated the effectiveness of the experimental measurements to isolate the channeling effect of delayed fission-product gamma-rays through lattices of RCF fuel pins

  12. Study of the crystallographic architecture of corals at the nanoscale by scanning transmission X-ray microscopy and transmission electron microscopy.

    Science.gov (United States)

    Benzerara, Karim; Menguy, Nicolas; Obst, Martin; Stolarski, Jarosław; Mazur, Maciej; Tylisczak, Tolek; Brown, Gordon E; Meibom, Anders

    2011-07-01

    We have investigated the nanotexture and crystallographic orientation of aragonite in a coral skeleton using synchrotron-based scanning transmission X-ray microscopy (STXM) and transmission electron microscopy (TEM). Polarization-dependent STXM imaging at 40-nm spatial resolution was used to obtain an orientation map of the c-axis of aragonite on a focused ion beam milled ultrathin section of a Porites coral. This imaging showed that one of the basic units of coral skeletons, referred to as the center of calcification (COC), consists of a cluster of 100-nm aragonite globules crystallographically aligned over several micrometers with a fan-like distribution and with the properties of single crystals at the mesoscale. The remainder of the skeleton consists of aragonite single-crystal fibers in crystallographic continuity with the nanoglobules comprising the COC. Our observation provides information on the nm-scale processes that led to biomineral formation in this sample. Importantly, the present study illustrates how the methodology described here, which combines HRTEM and polarization-dependent synchrotron-based STXM imaging, offers an interesting new approach for investigating biomineralizing systems at the nm-scale. Copyright © 2011 Elsevier B.V. All rights reserved.

  13. Pair distribution functions of amorphous organic thin films from synchrotron X-ray scattering in transmission mode

    Directory of Open Access Journals (Sweden)

    Chenyang Shi

    2017-09-01

    Full Text Available Using high-brilliance high-energy synchrotron X-ray radiation, for the first time the total scattering of a thin organic glass film deposited on a strongly scattering inorganic substrate has been measured in transmission mode. The organic thin film was composed of the weakly scattering pharmaceutical substance indomethacin in the amorphous state. The film was 130 µm thick atop a borosilicate glass substrate of equal thickness. The atomic pair distribution function derived from the thin-film measurement is in excellent agreement with that from bulk measurements. This ability to measure the total scattering of amorphous organic thin films in transmission will enable accurate in situ structural studies for a wide range of materials.

  14. Pair distribution functions of amorphous organic thin films from synchrotron X-ray scattering in transmission mode.

    Science.gov (United States)

    Shi, Chenyang; Teerakapibal, Rattavut; Yu, Lian; Zhang, Geoff G Z

    2017-09-01

    Using high-brilliance high-energy synchrotron X-ray radiation, for the first time the total scattering of a thin organic glass film deposited on a strongly scattering inorganic substrate has been measured in transmission mode. The organic thin film was composed of the weakly scattering pharmaceutical substance indomethacin in the amorphous state. The film was 130 µm thick atop a borosilicate glass substrate of equal thickness. The atomic pair distribution function derived from the thin-film measurement is in excellent agreement with that from bulk measurements. This ability to measure the total scattering of amorphous organic thin films in transmission will enable accurate in situ structural studies for a wide range of materials.

  15. Osteoporosis y climaterio. Medidas preventivas

    OpenAIRE

    Goberna Tricas, Josefina

    2001-01-01

    El climaterio constituye un proceso fisiológico en la vida de la mujer que puede modificar su estado de salud y aumentar la incidencia de algunas enfermedades como consecuencia de la deprivación estrogénica: entre ellas destaca la osteoporosis. Tras analizar su etiología y factores de riesgo, se des­criben detalladamente las diferentes medidas de prevención de dicha enfer­medad: nutrición, ejercicio físico, hábitos de vida saludables, etc.

  16. Development of scintillation-light-transmission type phoswich detector for simultaneous alpha- and beta (gamma)-ray counting

    Science.gov (United States)

    Yasuda, K.; Usuda, S.; Gunji, H.

    2000-08-01

    A new type of scintillation-light-transmission ZnS(Ag)/NE102A phoswich detector has been developed, in which scintillation light emitted from the phoswich is transmitted through an optical fiber to a photomultiplier tube. By adjusting wavelength of the scintillation light to transmittance region of the optical fiber, the phoswich detector was capable of successfully performing simultaneous counting of alpha- and beta (including gamma)-rays. In addition, the detector has been applied to a dip-type inline monitor, which directly contacts with actinide solution. The detector will be available especially in a narrow and/or isolated space such as glove box and hot cell.

  17. Composition measurement in substitutionally disordered materials by atomic resolution energy dispersive X-ray spectroscopy in scanning transmission electron microscopy.

    Science.gov (United States)

    Chen, Z; Taplin, D J; Weyland, M; Allen, L J; Findlay, S D

    2017-05-01

    The increasing use of energy dispersive X-ray spectroscopy in atomic resolution scanning transmission electron microscopy invites the question of whether its success in precision composition determination at lower magnifications can be replicated in the atomic resolution regime. In this paper, we explore, through simulation, the prospects for composition measurement via the model system of AlxGa1-xAs, discussing the approximations used in the modelling, the variability in the signal due to changes in configuration at constant composition, and the ability to distinguish between different compositions. Results are presented in such a way that the number of X-ray counts, and thus the expected variation due to counting statistics, can be gauged for a range of operating conditions. Copyright © 2016 Elsevier B.V. All rights reserved.

  18. Time-resolved soft X-ray absorption spectroscopy in transmission mode on liquids at MHz repetition rates

    Directory of Open Access Journals (Sweden)

    Mattis Fondell

    2017-09-01

    Full Text Available We present a setup combining a liquid flatjet sample delivery and a MHz laser system for time-resolved soft X-ray absorption measurements of liquid samples at the high brilliance undulator beamline UE52-SGM at Bessy II yielding unprecedented statistics in this spectral range. We demonstrate that the efficient detection of transient absorption changes in transmission mode enables the identification of photoexcited species in dilute samples. With iron(II-trisbipyridine in aqueous solution as a benchmark system, we present absorption measurements at various edges in the soft X-ray regime. In combination with the wavelength tunability of the laser system, the set-up opens up opportunities to study the photochemistry of many systems at low concentrations, relevant to materials sciences, chemistry, and biology.

  19. Investigation of early growth of calcium hydroxide crystals in cement solution by soft x-ray transmission microscopy

    Energy Technology Data Exchange (ETDEWEB)

    Harutyunyan, V. S.; Kirchheim, A. P.; Monteiro, P. J. M.; Aivazyan, A. P.; Fischer, P.

    2009-02-02

    Research on cement hydration was performed at the full-field soft transmission X-ray microscope XM-1 located at beamline 6.1.2 at the Advanced Light Source (ALS) in Berkeley CA which is operated by the Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, California. A series of works [1-3] has been conducted using this microscope for the in situ observation and qualitative analysis of through-solution hydration products and products of topochemical reactions, which form in cementitious aqueous solutions. This paper studies the precipitation of the calcium hydroxide (CH) crystals from the cement solution. The analysis of successive images of the hydration process provides critical quantitative information about the growth rate of calcium hydroxide (CH) crystals, the supersaturation ratio, and the kinetic and diffusion coefficients of the growth process. ASTM Type II portland cement and 6% C{sub 4}A{sub 3}{bar S} admixture were mixed in aqueous solution and saturated with respect to CH and gypsum. The C{sub 4}A{sub 3}{bar S} admixture was included in the experimental program because of the general research program on expansive cements, and adding C{sub 4}A{sub 3}{bar S} to portland cement is an efficient method of generating ettringite and significant early-age expansion. The solution/solid materials ratio was 10 cm{sup 3}/g, which is higher than the one existing in regular concrete and mortars; to compensate for this dilution, the solution was originally saturated with CH and gypsum. To allow sufficient transmission of the soft X-rays, a small droplet was taken from the supernatant solution and assembled in the sample holder, and then squeezed between two silicon nitride windows for the analysis. The X-ray optical setup of the microscope XM-1 is described elsewhere [2]. In this experiment, a wavelength of 2.4 nm (516.6 eV) was used. The radiation transmitting the sample was detected using an X-ray CCD camera, with a resolution of 35 nm provided

  20. Critical-angle transmission grating technology development for high resolving power soft x-ray spectrometers on Arcus and Lynx

    Science.gov (United States)

    Heilmann, Ralf K.; Bruccoleri, Alexander R.; Song, Jungki; Kolodziejczak, Jeffery; Gaskin, Jessica A.; O'Dell, Stephen L.; Cheimetz, Peter; Hertz, Edward; Smith, Randall K.; Burwitz, Vadim; Hartner, Gisela; La Caria, Marlis-Madeleine; Schattenburg, Mark L.

    2017-08-01

    Soft x-ray spectroscopy with high resolving power (R = λ/Δλ) and large effective area (A) addresses numerous unanswered science questions about the physical laws that lead to the structure of our universe. In the soft x-ray band R > 1000 can currently only be achieved with diffraction grating-based spectroscopy. Criticalangle transmission (CAT) gratings combine the advantages of blazed reflection gratings (high efficiency, use of higher diffraction orders) with those of conventional transmission gratings (relaxed alignment tolerances and temperature requirements, transparent at higher energies, low mass), resulting in minimal mission resource requirements, while greatly improving figures of merit. Diffraction efficiency > 33% and R > 10, 000 have been demonstrated for CAT gratings. Last year the technology has been certified at Technology Readiness Level 4 based on a probe class mission concept. The Explorer-scale (A > 450 cm2 , R > 2500) grating spectroscopy Arcus mission can be built with today's CAT grating technology and has been selected in the current Explorer round for a Phase A concept study. Its figure of merit for the detection of weak absorption lines will be an order of magnitude larger than current instruments on Chandra and XMM-Newton. Further CAT grating technology development and improvements in the angular resolution of x-ray optics can provide another order of magnitude improvement in performance, as is envisioned for the X-ray Surveyor/Lynx mission concept currently under development for input into the 2020 Decadal Survey. For Arcus we have tested CAT gratings in a spectrometer setup in combination with silicon pore optics (SPO) and obtained resolving power results that exceed Arcus requirements before and after environmental testing of the gratings. We have recently fabricated the largest (32 mm x 32 mm) CAT gratings to date, and plan to increase grating size further. We mounted two of these large gratings to frames and aligned them in the

  1. A numerical model for multiple detector energy dispersive X-ray spectroscopy in the transmission electron microscope

    Energy Technology Data Exchange (ETDEWEB)

    Xu, W.; Dycus, J.H.; Sang, X.; LeBeau, J.M., E-mail: jmlebeau@ncsu.edu

    2016-05-15

    Here we report a numerical approach to model a four quadrant energy dispersive X-ray spectrometer in the transmission electron microscope. The model includes detector geometries, specimen position and absorption, shadowing by the holder, and filtering by the Be carrier. We show that this comprehensive model accurately predicts absolute counts and intensity ratios as a function of specimen tilt and position. We directly compare the model to experimental results acquired with a FEI Super-X EDS four quadrant detector. The contribution from each detector to the sum is investigated. The program and source code can be downloaded from (https://github.com/subangstrom/superAngle). - Highlights: • A novel numeric model is developed to predict the effective detector collection angle for multi-detector EDS in the transmission electron microscope. • The precise geometry of specimen holder is incorporated to determine the influence of holder shadowing • The role of X-ray filtering by the Be specimen carrier is investigated. • Predicted counts and intensity ratios are directly compared to experiment as a function of tilt and are shown to be in excellent agreement • The detector intensity sum effectively reduces errors compared to the individual detector signals.

  2. Transmission properties of barite mortar using X-ray spectra measured with Cd Te detector

    Energy Technology Data Exchange (ETDEWEB)

    Santos, J. C.; Mariano, L.; Costa, P. R. [Universidade de Sao Paulo, Instituto de Fisica, Rua do Matao Travessa R. 187, Cidade Universitaria, 05508-090 Sao Paulo (Brazil); Tomal, A., E-mail: josilene@usp.br [Universidade Federal de Goias, Instituto de Fisica, Campus Samambaia, 74001-970 Goiania (Brazil)

    2014-08-15

    Current methods for calculating X-ray shielding barriers do not take into account spectral distribution of the beam transmitted by the protective material. This consideration is important in dose estimations for radiation workers and general public in diagnostic radiology facilities. The aim of the present study was to estimate barite mortar attenuation curves using X-ray spectra weighted by a workload distribution. These curves were described in units of ambient dose equivalent (H (10)), since it is the radiation quantity adopted by IAEA for dose assessment in medical environment. Attenuation curves were determined using the optimized model for shielding evaluation presented by Costa and Caldas (2002). Workload distribution presented by Simpkin (1996), measured primary spectra and mass attenuation coefficients of barite mortar were used as input data in this model. X-ray beams in diagnostic energy range were generated by an industrial X-ray tube with 3 mm of aluminum additional filtration. Primary experimental spectra were measured by a Cd Te detector and corrected by the response function of detector by means of a stripping procedure. Air kerma measurements were performed using an ionization chamber for normalization purpose of the spectra. The corrected spectra presented good agreement with spectra generated by a semi-empirical model. The variation of the ambient dose equivalent as a function of barite mortar thickness was calculated. Using these data, it was estimated the optimized thickness of protective barrier needed for shielding a particular area in an X-ray imaging facility. The results obtained for primary protective barriers exhibit qualitative agreement with those presented in literature. (Author)

  3. Medidas de dispersión como medidas del riesgo de inmunización

    OpenAIRE

    Balbás, Alejandro; Ibáñez, Alfredo

    1995-01-01

    En el presente trabajo se discute cómo en principio cualquier medida de dispersión puede ser una medida del riesgo de inmunización. Es el conjunto de shocks y dentro de ellos los peores shocks los que determinan la forma de las medidas de dispersión, haciendo que sólo consideremos como medidas adecuadas a la medida cuadratica M2 y a la media lineal Ñ, porque vienen dadas por un conjunto de shocks y unos peores shocks razonables. Por último, se concluye que quizás la medida Ñ es una mejor medi...

  4. Design and Performance of a TES X-ray Microcalorimeter Array for Energy Dispersive Spectroscopy on Scanning Transmission Electron Microscope

    Science.gov (United States)

    Muramatsu, Haruka; Nagayoshi, K.; Hayashi, T.; Sakai, K.; Yamamoto, R.; Mitsuda, K.; Yamasaki, N. Y.; Maehata, K.; Hara, T.

    2016-07-01

    We discuss the design and performance of a transition edge sensor (TES) X-ray microcalorimeter array for scanning transmission electron microscope (STEM)-energy dispersive X-ray spectroscopy (EDS). The TES X-ray microcalorimeter has better energy resolution compared to conventional silicon drift detector and STEM-EDS utilizing a TES detector makes it possible to map the distribution of elements on a specimen in addition to analyze the composition. The requirement for a TES detector is a high counting rate (>20 kcps), wide energy band (0.5-15 keV) and good energy resolution (<10 eV) full width at half maximum. The major improvement of this development is to increase the maximum counting rate. In order to accommodate the high counting rate, we adopted an 8 × 8 format, 64-pixel array and common biasing scheme for the readout method. We did all design and fabrication of the device in house. With the device we have fabricated most recently, the pulse decay time is 40 \\upmu s which is expected to achieve 50 kcps. For a single pixel, the measured energy resolution was 7.8 eV at 5.9 keV. This device satisfies the requirements of counting rate and energy resolution, although several issues remain where the performance must be confirmed.

  5. X-ray transmission/scattering technique for thickness-independent density measurement

    Energy Technology Data Exchange (ETDEWEB)

    Giacomelli, E.J.

    1978-12-20

    A nondestructive technique, using penetrating x radiation, has been developed to measure the density uniformity of low-Z, compressible materials that is independent of material thickness. Thickness independence is achieved by simultaneously monitoring the transmitted and scattered x rays. Results on samples of pressed carbon materials have demonstrated that there is the expected linear relationship between measured quantities and material density, independent of material thickness, and that this is a viable means of measuring density uniformity.

  6. Zernike phase contrast in high-energy x-ray transmission microscopy based on refractive optics.

    Science.gov (United States)

    Falch, Ken Vidar; Lyubomirsky, Mikhail; Casari, Daniele; Snigirev, Anatoly; Snigireva, Irina; Detlefs, Carsten; Michiel, Marco Di; Lyatun, Ivan; Mathiesen, Ragnvald H

    2018-01-01

    The current work represents the first implementation of Zernike phase contrast for compound refractive lens based x-ray microscopy, and also the first successful Zernike phase contrast experiment at photon energies above 12 keV. Phase contrast was achieved by fitting a compound refractive lens with a circular phase plate. The resolution is demonstrated to be sub-micron, and can be improved using already existing technology. The possibility of combining the technique with polychromatic radiation is considered, and a preliminary test experiment was performed with positive results. Copyright © 2017 Elsevier B.V. All rights reserved.

  7. Diffusion of Ag into organic semiconducting materials: a combined analytical study using transmission electron microscopy and X-ray reflectivity.

    Science.gov (United States)

    Fladischer, Stefanie; Neuhold, Alfred; Kraker, Elke; Haber, Thomas; Lamprecht, Bernhard; Salzmann, Ingo; Resel, Roland; Grogger, Werner

    2012-10-24

    This study shows that the morphology of organic/metal interfaces strongly depends on process parameters and the involved materials. The interface between organic n-type blocking layer materials and the top Ag cathode within an organic photodiode was investigated. Ag was deposited on either amorphous tris-8-hydroxyquinolinato-aluminum (Alq(3)) or crystalline 4,7-diphenyl-1,10-phenanthroline (Bphen) using different deposition techniques such as electron beam deposition, ion beam sputtering, and vacuum thermal evaporation at various deposition rates. The interfaces were studied by transmission electron microscopy and X-ray reflectivity. It was found that Bphen does not show any Ag diffusion no matter which deposition technique was used, whereas the Ag diffusion into Alq(3) depends on the deposition technique and the deposition rate. The highest amount of Ag diffusion into Alq(3) occurred by using thermal vacuum deposition at low deposition rates.

  8. Research and Design of a Sample Heater for Beam Line 6-2c Transmission X-ray Microscope

    Energy Technology Data Exchange (ETDEWEB)

    Policht, Veronica; /Loyola U., Chicago /SLAC

    2012-08-27

    There exists a need for environmental control of samples to be imaged by the Transmission X-Ray Microscope (TXM) at the SSRLs Beam Line 6-2c. In order to observe heat-driven chemical or morphological changes that normally occur in situ, microscopes require an additional component that effectively heats a given sample without heating any of the microscope elements. The confinement of the heat and other concerns about the heaters integrity limit which type of heater is appropriate for the TXM. The bulk of this research project entails researching different heating methods used previously in microscopes, but also in other industrial applications, with the goal of determining the best-fitting method, and finally in designing a preliminary sample heater.

  9. Calculated efficiencies of three-material low stress coatings for diffractive x-ray transmission optics

    Energy Technology Data Exchange (ETDEWEB)

    Kubec, Adam, E-mail: adam.kubec@iws.fraunhofer.de; Braun, Stefan; Gawlitza, Peter; Menzel, Maik; Leson, Andreas [Fraunhofer IWS Dresden, Winterbergstr. 28, 01277 Dresden (Germany)

    2016-07-27

    Diffractive X-ray optical elements made by thin film coating techniques such as multilayer Laue lenses (MLL) and multilayer zone plates (MZP) are promising approaches to achieve resolutions in hard X-ray microscopy applications of less than 10 nm. The challenge is to make a lens with a large numerical aperture on the one hand and a decent working distance on the other hand. One of the limiting factors with the coated structures is the internal stress in the films, which can lead to significant bending of the substrate and various types of unwanted diffraction effects. Several approaches have been discussed to overcome this challenge. One of these is a three-material combination such as Mo/MoSi{sub 2}/Si, where four single layers per period are deposited. Mo and Si represent the absorber and spacer in this case while MoSi{sub 2} forms a diffusion barrier; in addition the thicknesses of absorber and spacer are chosen to minimize residual stress of the overall coating. Here the diffraction efficiency as well as the profile of the beam in the focal plane are discussed in order to find a tradeoff between lowest residual stress and best diffraction properties.

  10. Quantification of single fluid inclusions by combining synchrotron radiation-induced micro-X-ray fluorescence and transmission.

    Science.gov (United States)

    Cauzid, J; Philippot, P; Somogyi, A; Simionovici, A; Bleuet, P

    2004-07-15

    Fluid inclusions represent the only direct samples of ancient fluids in many crustal rocks; precise knowledge of their chemical composition provides crucial information to model paleofluid-rock interactions and hydrothermal transport processes. Owing to its nondestructive character, micrometer-scale spatial resolution, and high sensitivity, synchrotron radiation-induced micro-X-ray fluorescence has received great interest for the in situ multielement analysis of individual fluid inclusions. Major uncertainties associated with the quantitative analysis of single fluid inclusions arise from the inclusion depth and the volume of fluid sampled by the incident beam. While the depth can be extracted directly from the fluorescence spectrum, its volume remains a major source of uncertainty. The present study performed on natural and synthetic inclusions shows that the inclusion thickness can be accurately evaluated from transmission line scans. Experimental data matched numerical simulations based on an elliptical inclusion geometry. However, for one nonelliptical inclusion, the experimental data were confirmed using a computed absorption tomography reconstruction. Good agreement between the imaging and scanning techniques implies that the latter provides reliable fluid thickness values independent of the shape of the inclusion. Taking into consideration the incident angle, the incident beam energy, the inclusion fluid salinity, and the transmission measurement stability resulted in errors of 0.3-2 microm on calculated fluid inclusion thicknesses.

  11. Radon-222 and gamma ray levels associated with the collection, processing, transmission, and utilization of natural gas.

    Science.gov (United States)

    van Netten, C; Kan, K; Anderson, J; Morley, D

    1998-09-01

    The natural gas industry in British Columbia was investigated for exposure to radioactive contaminants such as radon-222 and lead-210. Radon activity associated with the gathering system ranged from 7-921 Bq/m3. The pipelines to the processing facility contained sludge that had a mean lead-210 activity of 0.494 Bq/g (0.379 standard deviation [SD]) and a mean radium-226 activity of 0.417 (0.398 SD). Within the processing facility the highest levels of radon were associated with propane production streams, and activities as high as 4958 Bq/m3 were found. Equipment handling these streams was also found to have a buildup of scale with lead-210, radium-224, and radium-226 activity. The transmission of salable gas to the consumer indicated a decrease in radon activity that was slightly lower than the estimated radon activity based on the half-life of radon, the distance from the production facility, and the speed of gas transmission. The risk of radon exposure to the worker was deemed well below the guidelines and would be controlled more than adequately by means of the occupational standards for the natural gas components. Gamma ray exposure was also well below the occupational standards. Radon exposure to the consumer was virtually nonexistent in the Vancouver region from both natural gas and propane. Although this might not be the case for consumers of propane closer to the production facilities, its contribution is likely to be minimal.

  12. Three-beam resonant X-ray diffraction in germanium - Laue transmission cases.

    Science.gov (United States)

    Thorkildsen, Gunnar; Larsen, Helge B; Weckert, Edgar; Mo, Frode; Mathiesen, Ragnvald H

    2005-07-01

    Perturbation of the two-beam diffracted power owing to the influence of a third lattice node has been examined for various three-beam cases in a small finite germanium crystal in the vicinity of the K-absorption edge. Although the crystal was slightly imperfect, the main parts of the experimental results are very well described within the framework of the fundamental theory of X-ray diffraction in conjunction with Cromer-Liberman calculations for the resonant scattering terms. Beam divergence and dynamical block size are treated as adjustable parameters in the analysis. Observed changes in the three-beam profile asymmetry are mainly attributed to size and not to resonance effects associated with the triplet phase sum of the involved reflections. Close to the absorption edge there is however some evidence indicating that f' values should be reduced in magnitude compared to the tabulated ones.

  13. Scanning transmission x-ray microscopy of polymer nanoparticles: probing morphology on sub-10 nm length scales

    Science.gov (United States)

    Burke, Kerry B.; Stapleton, Andrew J.; Vaughan, Ben; Zhou, Xiaojing; Kilcoyne, A. L. David; Belcher, Warwick J.; Dastoor, Paul C.

    2011-07-01

    Water-processable nanoparticle dispersions of semiconducting polymers offer an attractive approach to the fabrication of organic electronic devices since they offer: (1) control of nanoscale morphology and (2) environmentally friendly fabrication. Although the nature of phase segregation in these polymer nanoparticles is critical to device performance, to date there have been no techniques available to directly determine their intra-particle structure, which consequently has been poorly understood. Here, we present scanning transmission x-ray microscopy (STXM) compositional maps for nanoparticles fabricated from poly(9,9-dioctyl-fluorene-2,7-diyl-co-bis-N, N'-(4-butylphenyl)-bis-N, N'-phenyl-1,4-phenylenedi-amine) (PFB) and poly(9,9-dioctylfluorene-2,7-diyl-co-benzothiadiazole) (F8BT) 1:1 blend mixtures. The images show distinct phase segregation within the nanoparticles. The compositional data reveals that, within these nanoparticles, PFB and F8BT segregate into a core-shell morphology, with an F8BT-rich core and a PFB-rich shell. Structural modelling demonstrates that the STXM technique is capable of quantifying morphological features on a sub-10 nm length scale; below the spot size of the incident focused x-ray beam. These results have important implications for the development of water-based 'solar paints' fabricated from microemulsions of semiconducting polymers.

  14. Phototransistors use for dosimetric characteristics measurements of radiosurgery X-ray field; Uso de fototransistores para medida das caracteristicas dosimetricas de feixes de raios-X utilizados em radiocirurgia estereotaxica

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Walter M.; Hazin, Clovis A. [Pernambuco Univ., Recife, PE (Brazil). Dept. de Energia Nuclear; Souza, Cleber N. de [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil); Santos, Luiz Antonio P. dos [Centro Regional de Ciencias Nucleares (CRCN), Recife, PE (Brazil); Silva Junior, Eronildes F. da [Pernambuco Univ., Recife, PE (Brazil). Dept. de Fisica

    2002-07-01

    Small X-ray beams are normally used in radiosurgery for the treatment of small intracranial lesions. The success of the treatment relies on the adequate planning, which in turn requires accurate evaluation of the radiation beam characteristics such as Percentage Depth Dose, Output Factor and Tissue-Maximum Ratio. However, the dosimetry of small X-ray fields is not a straightforward procedure, because the dimensions of the detectors normally used are not small enough so that their sensitive volumes are completely covered by the radiation beam, as well as to assure that electronic equilibrium conditions are attained. In this work, we have tested a transistor-type electronic device to be used as photodetector to determine some of the dosimetric parameters of a 6-MV linear accelerator used for radiosurgery. The results show that, under certain conditions, such a semiconductor device can be used for evaluating the dosimetric characteristics of small radiation beams used in radiosurgery. (author)

  15. Absolute activity measurement and gamma-ray emission probability for decay of I-126; Medida absoluta da atividade e determinacao da taxa de emissao gama por decaimento do {sup 126} I

    Energy Technology Data Exchange (ETDEWEB)

    Fonseca, Katia Aparecida

    1997-07-01

    The accurate knowledge of the gamma-ray emission probability per decay of radionuclides is important in several applications. In the case of {sup 126} I, its importance lies mainly in fast neutron dosimetry as well as in the production of {sup 125} I where {sup 126} I appears as an impurity. In the present work the gamma-ray emission probabilities per decay for the 388 and 666-KeV transitions of {sup 126} I have been measured. This radionuclide was obtained by means of the {sup 127} I(n, 2n){sup 126} I reaction in a fast neutron flux at the IPEN 2 MW research reactor. The methodology for the primary standardization of {sup 126} I is described. For this purpose, two different coincidence systems were used due to the complex decay scheme of this radionuclide. The {beta}branch measurement was carried out in a 4 {pi}(PC){beta}-{gamma} coincidence system consisting of a proportional counter, coupled to a pair of 3'x3' Na I (Tl) crystal. The electron capture branch was measured in a X-{gamma} coincidence system using two NaI(Tl) crystals. The gamma-ray measurements were performed in a HPGe system, previously calibrated by means of standard sources supplied by the International Atomic Energy Agency. All the uncertainties evolved were treated rigorously, by means of covariance analysis. (author)

  16. Nanoconfinement platform for nanostructure quantification via grazing-transmission X-ray scattering

    Science.gov (United States)

    Black, Charles T.; Yager, Kevin G.

    2017-01-31

    A nano-confinement platform that may allow improved quantification of the structural order of nanometer-scale systems. Sample-holder `chips` are designed for the GTSAXS experimental geometry. The platform involves fabricated nanostructured sample holders on and in one or more corners of a substrate support where the sample material of interest is positioned at the corner of the substrate support. In an embodiment, the substrate material making up the substrate support beneath the sample-holding area is removed. A scattering x-ray sample platform includes a substrate support arranged in a parallelepiped form, having a substantially flat base and a substantially flat top surface, the top surface being substantially parallel with the base, the parallelepiped having a plurality of corners. At least one corner of the substrate support has a sample holding area formed in the top surface of the substrate support and within a predetermined distance from the corner. The sample holding area includes a regular array of nano-wells formed in the top surface of the substrate support.

  17. Medida del granizo mediante graniz??metros

    OpenAIRE

    Palencia Coto, Covadonga

    2011-01-01

    202 p. Los principales objetivos del trabajo que aqu?? se presenta son: 1) Realizar un estudio bibliom??trico sobre las publicaciones dedicadas a la medida del granizo y el uso del graniz??metro. 2) Analizar las posibles incertidumbres en la medida del granizo generadas en diferentes procesos de calibraci??n del graniz??metro. 3) Estudiar la incertidumbre generada en la medida del granizo por el solapamiento de las huellas en un graniz??metro, y elaborar un modelo para corregir el...

  18. Equivalence between electrical measurements and X ray diffraction in the formation of crystalline phases of cement paste; Equivalencia entre medidas electricas y difraccion de rayos X en la formacion de fases cristalinas de pastas de cemento

    Energy Technology Data Exchange (ETDEWEB)

    Menendez, E.; Frutos, J. de

    2011-07-01

    In this paper a comparative study of the hydration process in a very early age, first 20 hours, between a conventional cement paste and its equivalent with a replacement of slag of about 12%, is done. The study was undertaken through semiadibatic calorimetry, electrical impedance spectroscopy and X-ray diffraction. It shows that using electrical impedance spectroscopy we can determine the state of crystallization of the cement with and without additions, thereby determining the time at which the different processes are initiated in the hydration. (Author) 31 refs.

  19. Method to eliminate the damage aroused by intrinsic prepulse of Blumlein transmission line in capillary discharge soft X-ray laser system

    Science.gov (United States)

    Wang, Q.; Xie, Y.; Zhao, Y. P.; Zhu, Q. S.; Mo, M. Z.; Yang, D. W.

    2009-10-01

    To raise the utilization ratio of the energy power, and meanwhile, guarantee the waveform of the main discharge current to obtain X-ray laser, our capillary discharged Ne-like Ar soft X-ray laser system adopts Blumleim transmission line (BTL) and a 300 kV-Marx generator; and by using our self-developed intrinsic-prepulse elimination device and extrinsic-prepulse generator, we successfully removed the intrinsic prepulse of BTL, and thus eliminated its deteriorative effect towards Z-pinch plasma. By this means, we obtained stable X-ray laser output; and the voltage transmission rate of our system nearly reaches 122%, which provides a guarantee for the miniaturization of the power source and the whole system.

  20. Oxygenated interface on biomass burn tar balls determined by single particle scanning transmission X-ray microscopy.

    Science.gov (United States)

    Tivanski, Alexei V; Hopkins, Rebecca J; Tyliszczak, Tolek; Gilles, Mary K

    2007-06-28

    Carbonaceous particles originating from biomass burning can account for a large fraction of organic aerosols in a local environment. Presently, their composition, physical and chemical properties, as well as their environmental effects are largely unknown. Tar balls, a distinct type of highly spherical carbonaceous biomass burn particles, have been observed in a number of field campaigns. The Yosemite Aerosol Characterization Study that took place in summer 2002 occurred during an active fire season in the western United States; tar balls collected during this field campaign are described in this article. Scanning transmission X-ray microscopy and near-edge X-ray absorption fine structure spectroscopy are used to determine the shape, structure, and size-dependent chemical composition of approximately 150 individual spherical particles ranging in size from 0.15 to 1.2 mum. The elemental composition of tar balls is approximately 55% atomic carbon and approximately 45% atomic oxygen. Oxygen is present primarily as carboxylic carbonyls and oxygen-substituted alkyl (O-alkyl-C) functional groups, followed by moderate amounts of ketonic carbonyls. The observed chemical composition, density, and carbon functional groups are distinctly different from soot or black carbon and more closely resemble high molecular weight polymeric humic-like substances, which could account for their reported optical properties. A detailed examination of the carboxylic carbonyl and O-alkyl-C functional groups as a function of particle size reveals a thin oxygenated interface layer. The high oxygen content, as well as the presence of water-soluble carboxylic carbonyl groups, could account for the reported hygroscopic properties of tar balls. The presence of the oxygenated layer is attributed to atmospheric processing of biomass burn particles.

  1. Classification of Multiple Types of Organic Carbon Composition in Atmospheric Particles by Scanning Transmission X-Ray Microscopy Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Kilcoyne, Arthur L; Takahama, S.; Gilardoni, S.; Russell, L.M.; Kilcoyne, A.L.D.

    2007-05-16

    A scanning transmission X-ray microscope at the Lawrence Berkeley National Laboratory is used to measure organic functional group abundance and morphology of atmospheric aerosols. We present a summary of spectra, sizes, and shapes observed in 595 particles that were collected and analyzed between 2000 and 2006. These particles ranged between 0.1 and 12 mm and represent aerosols found in a large range of geographical areas, altitudes, and times. They include samples from seven different field campaigns: PELTI, ACE-ASIA, DYCOMS II, Princeton, MILAGRO (urban), MILAGRO (C-130), and INTEX-B. At least 14 different classes of organic particles show different types of spectroscopic signatures. Different particle types are found within the same region while the same particle types are also found in different geographical domains. Particles chemically resembling black carbon, humic-like aerosols, pine ultisol, and secondary or processed aerosol have been identified from functional group abundance and comparison of spectra with those published in the literature.

  2. Spatial Distributions of Discharged Products of Lithium-Oxygen Batteries Revealed by Synchrotron X-ray Transmission Microscopy.

    Science.gov (United States)

    Olivares-Marín, Mara; Sorrentino, Andrea; Lee, Rung-Chuan; Pereiro, Eva; Wu, Nae-Lih; Tonti, Dino

    2015-10-14

    The discharge products of ether-based Li-O2 cells were grown directly on common carbon-coated TEM grids and observed by oxidation-state-sensitive full field transmission soft X-ray microscopy (TXM). The acquired data have permitted to quantify and localize with spatial resolution the distribution of the oxygen discharge products in these samples (i.e., lithium superoxide, peroxide, and carbonates) and appreciate several compositional, structural, and morphological aspects. Most of the peroxide particles had a toroidal shape, often with a central hole usually open on only one side, and which included significant amounts of superoxide-like phases (LiO2/Li2O2 ratio between 0.2 and 0.5). Smaller particles had smaller or no superoxide content, from which we infer that abundance of soluble LiO2 may have a role in toroid formation. Significant amount of carbonates were found irregularly distributed on the electrode surface, occasionally appearing as small particles and aggregates, and mostly coating lithium peroxide particles. This suggests the formation of a barrier that, similar to the solid electrolyte interface (SEI) critical in Li-ion batteries, requires an appropriate management for a reversible operation.

  3. Evolution and Function of Dinosaur Teeth at Ultramicrostructural Level Revealed Using Synchrotron Transmission X-ray Microscopy.

    Science.gov (United States)

    Wang, Chun-Chieh; Song, Yen-Fang; Song, Sheng-Rong; Ji, Qiang; Chiang, Cheng-Cheng; Meng, Qingjin; Li, Haibing; Hsiao, Kiko; Lu, Yi-Chia; Shew, Bor-Yuan; Huang, Timothy; Reisz, Robert R

    2015-10-29

    The relationship between tooth form and dietary preference is a crucial issue in vertebrate evolution. However, the mechanical properties of a tooth are influenced not only by its shape but also by its internal structure. Here, we use synchrotron transmission X-ray microscopy to examine the internal microstructures of multiple dinosaur teeth within a phylogenetic framework. We found that the internal microstructures of saurischian teeth are very different from advanced ornithischian teeth, reflecting differences in dental developmental strategies. The three-tissue composition (enamel-mantle dentin-bulk dentin) near the dentinoenamel junction (DEJ) in saurischian teeth represents the primitive condition of dinosaur teeth. Mantle dentin, greatly reduced or absent from DEJ in derived ornithischian teeth, is a key difference between Saurischia and Ornithischia. This may be related to the derived herbivorous feeding behavior of ornithischians, but interestingly, it is still retained in the herbivorous saurischian sauropods. The protective functions of mantle dentin with porous microstructures between enamel and bulk dentin inside typical saurischian teeth are also discussed using finite-element analysis method. Evolution of the dental modifications in ornithischian dinosaurs, with the absence of mantle dentin, may be related to changes in enamel characteristics with enamel spindles extending through the DEJ.

  4. Comparison of contrast-to-noise ratios of transmission and dark-field signal in grating-based X-ray imaging for healthy murine lung tissue.

    Science.gov (United States)

    Schwab, Felix; Schleede, Simone; Hahn, Dieter; Bech, Martin; Herzen, Julia; Auweter, Sigrid; Bamberg, Fabian; Achterhold, Klaus; Yildirim, Ali Ö; Bohla, Alexander; Eickelberg, Oliver; Loewen, Rod; Gifford, Martin; Ruth, Ronald; Reiser, Maximilian F; Nikolaou, Konstantin; Pfeiffer, Franz; Meinel, Felix G

    2013-09-01

    An experimental comparison of the contrast-to-noise ratio (CNR) between transmission and dark-field signals in grating-based X-ray imaging for ex-vivo murine lung tissue. Lungs from three healthy mice were imaged ex vivo using a laser-driven compact synchrotron X-ray source. Background noise of transmission and dark-field signal was quantified by measuring the standard deviation in a region of interest (ROI) placed in a homogeneous area outside the specimen. Image contrast was quantified by measuring the signal range in rectangular ROIs placed in central and peripheral lung parenchyma. The relative contrast gain (RCG) of dark-field over transmission images was calculated as CNRDF / CNRT. In all images, there was a trend for contrast-to-noise ratios of dark-field images (CNRDF) to be higher than for transmission images (CNRT) for all ROIs (median 61 vs. 38, p=0.10), but the difference was statistically significant only for peripheral ROIs (61 vs. 32, p=0.03). Median RCG was >1 for all ROIs (1.84). RCG values were significantly smaller for central ROIs than for peripheral ROIs (1.34 vs. 2.43, p=0.03). The contrast-to-noise ratio of dark-field images compares more favorably to the contrast-to-noise ratio of transmission images for peripheral lung regions as compared to central regions. For any specific specimen, a calculation of the RCG allows comparing which X-ray modality (dark-field or transmission imaging) produces better contrast-to-noise characteristics in a well-defined ROI. Copyright © 2012. Published by Elsevier GmbH.

  5. Microstructural characterization of industrial foams by gamma ray transmission and X-ray microtomography; Caracterizacao microestrutural de espumas industriais por transmissao de raios gama e microtomografia de raios X

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Luiz Eduardo

    2004-07-01

    This work presents the total porosity measurements of the aluminum and silicon carbide (SiC) foams samples. For porosity determination the gamma ray transmission and X-ray microtomography with conic beam techniques were used. These methods have more advantage than conventional ones, because they are non destructive and provide more details of the analyzed material porous structure. The aluminum foam samples with 10, 20, 30, 40 and 45 ppi (pores per inch) and SiC ceramic foam samples with 20, 30, 45, 60, 75, 80 and 90 ppi were analysed by gamma transmission. The SiC 60, 75 and 90 ppi samples were also analyzed by X-ray microtomography. For the gamma ray transmission measurements it was used an {sup 241} Am source (59.53 keV), a NaI(Tl) scintillation detector, collimators, a XYZ micrometric table and standard gamma spectrometry electronics connected to a multichannel analyzer, at the LFNA/UEL. For the X-ray microtomographic measurements, the Fein Focus X-ray system of the Nuclear Instrumentation Laboratory of the COPPE, located at the Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, was used. This equipment provide us images with micrometric resolution (53.48 {mu}m) using a conic X-ray beam and bidimensional detection. The microtomographic images were pre-processed and analyzed by the Imago software, developed at Porous Media and Materials Thermophysical Properties Laboratory (LMPT) of the Mechanical Engineering Department, located at Universidade Federal de Santa Catarina, Florianopolis, SC. Employing the The Imago software it was calculated the total porosity, pore size distribution and autocorrelation function C(u) of the binarized microtomographic images of the each sample. The microtomographic 3-D image of each sample was compared with 3-D image reconstructed by the Gaussian truncated method. This method generates a periodic 3-D porous structure by using of the autocorrelation function of one 2-D cross sectional image of the sample. (author)

  6. Carbon corrosion of proton exchange membrane fuel cell catalyst layers studied by scanning transmission X-ray microscopy

    Science.gov (United States)

    Hitchcock, Adam P.; Berejnov, Viatcheslav; Lee, Vincent; West, Marcia; Colbow, Vesna; Dutta, Monica; Wessel, Silvia

    2014-11-01

    Scanning Transmission X-ray Microscopy (STXM) at the C 1s, F 1s and S 2p edges has been used to investigate degradation of proton exchange membrane fuel cell (PEM-FC) membrane electrode assemblies (MEA) subjected to accelerated testing protocols. Quantitative chemical maps of the catalyst, carbon support and ionomer in the cathode layer are reported for beginning-of-test (BOT), and end-of-test (EOT) samples for two types of carbon support, low surface area carbon (LSAC) and medium surface area carbon (MSAC), that were exposed to accelerated stress testing with upper potentials (UPL) of 1.0, 1.2, and 1.3 V. The results are compared in order to characterize catalyst layer degradation in terms of the amounts and spatial distributions of these species. Pt agglomeration, Pt migration and corrosion of the carbon support are all visualized, and contribute to differing degrees in these samples. It is found that there is formation of a distinct Pt-in-membrane (PTIM) band for all EOT samples. The cathode thickness shrinks due to loss of the carbon support for all MSAC samples that were exposed to the different upper potentials, but only for the most aggressive testing protocol for the LSAC support. The amount of ionomer per unit volume significantly increases indicating it is being concentrated in the cathode as the carbon corrosion takes place. S 2p spectra and mapping of the cathode catalyst layer indicates there are still sulfonate groups present, even in the most damaged material.

  7. Monte-Carlo simulation of noise in hard X-ray Transmission Crystal Spectrometers: Identification of contributors to the background noise and shielding optimizationa)

    Science.gov (United States)

    Thfoin, I.; Reverdin, C.; Hulin, S.; Szabo, C. I.; Bastiani-Ceccotti, S.; Batani, D.; Brambrink, E.; Koenig, M.; Duval, A.; Leboeuf, X.; Lecherbourg, L.; Rossé, B.; Morace, A.; Santos, J. J.; Vaisseau, X.; Fourment, C.; Giuffrida, L.; Nakatsutsumi, M.

    2014-11-01

    Transmission crystal spectrometers (TCS) are used on many laser facilities to record hard X-ray spectra. During experiments, signal recorded on imaging plates is often degraded by a background noise. Monte-Carlo simulations made with the code GEANT4 show that this background noise is mainly generated by diffusion of MeV electrons and very hard X-rays. An experiment, carried out at LULI2000, confirmed that the use of magnets in front of the diagnostic, that bent the electron trajectories, reduces significantly this background. The new spectrometer SPECTIX (Spectromètre PETAL à Cristal en TransmIssion X), built for the LMJ/PETAL facility, will include this optimized shielding.

  8. Monte-Carlo simulation of noise in hard X-ray Transmission Crystal Spectrometers: identification of contributors to the background noise and shielding optimization.

    Science.gov (United States)

    Thfoin, I; Reverdin, C; Hulin, S; Szabo, C I; Bastiani-Ceccotti, S; Batani, D; Brambrink, E; Koenig, M; Duval, A; Leboeuf, X; Lecherbourg, L; Rossé, B; Morace, A; Santos, J J; Vaisseau, X; Fourment, C; Giuffrida, L; Nakatsutsumi, M

    2014-11-01

    Transmission crystal spectrometers (TCS) are used on many laser facilities to record hard X-ray spectra. During experiments, signal recorded on imaging plates is often degraded by a background noise. Monte-Carlo simulations made with the code GEANT4 show that this background noise is mainly generated by diffusion of MeV electrons and very hard X-rays. An experiment, carried out at LULI2000, confirmed that the use of magnets in front of the diagnostic, that bent the electron trajectories, reduces significantly this background. The new spectrometer SPECTIX (Spectromètre PETAL à Cristal en TransmIssion X), built for the LMJ/PETAL facility, will include this optimized shielding.

  9. Monte-Carlo simulation of noise in hard X-ray Transmission Crystal Spectrometers: Identification of contributors to the background noise and shielding optimization

    Energy Technology Data Exchange (ETDEWEB)

    Thfoin, I., E-mail: isabelle.lantuejoul@cea.fr; Reverdin, C.; Duval, A.; Leboeuf, X.; Lecherbourg, L.; Rossé, B. [CEA, Centre de Saclay, IRFU, F-91191 Gif-sur-Yvette (France); Hulin, S.; Batani, D.; Santos, J. J.; Vaisseau, X.; Fourment, C.; Giuffrida, L. [CELIA, Université de Bordeaux-CNRS-CEA, F-33405 Talence (France); Szabo, C. I. [Laboratoire Kastler Brossel, ENS, CNRS, UPMC, 75005 Paris Cedex (France); Bastiani-Ceccotti, S.; Brambrink, E.; Koenig, M.; Nakatsutsumi, M. [LULI Ecole Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau (France); Morace, A. [University of Milano, via Celoria 16, 20133 Milano (Italy)

    2014-11-15

    Transmission crystal spectrometers (TCS) are used on many laser facilities to record hard X-ray spectra. During experiments, signal recorded on imaging plates is often degraded by a background noise. Monte-Carlo simulations made with the code GEANT4 show that this background noise is mainly generated by diffusion of MeV electrons and very hard X-rays. An experiment, carried out at LULI2000, confirmed that the use of magnets in front of the diagnostic, that bent the electron trajectories, reduces significantly this background. The new spectrometer SPECTIX (Spectromètre PETAL à Cristal en TransmIssion X), built for the LMJ/PETAL facility, will include this optimized shielding.

  10. Medidas cautelares sobre el responsable tributario

    OpenAIRE

    Martínez Muñoz, Yolanda

    2014-01-01

    Las medidas que con una finalidad cautelar pueden ser adoptadas sobre el responsable tributario deben adaptarse a lo dispuesto en el artículo 81 de la LGT, en relación con sus requisitos, clases, procedimiento y límites. No obstante, la adopción de medidas cautelares sobre una persona distinta del deudor principal presenta cierta particularidades que pueden resultar interesantes desde un punto de vista teórico y práctico, siendo dichas cuestiones las que constituyen el objeto del presente tra...

  11. Determination of structural geometric parameters of industrial ceramic foams by gamma rays transmission and X-rays microtomography; Determinacao de parametros geometricos estruturais de espumas ceramicas industriais por transmissao de raios gama e microtomografia de raios X

    Energy Technology Data Exchange (ETDEWEB)

    Rocha, Wilson Roberto Dejato da

    2005-07-01

    In this work, the gamma rays transmission and X-rays microtomography techniques are used for the evaluation of the porosity and the pore size distribution of SiC ceramic foams. It was also accomplished the three-dimensional images after the determination of samples geometric parameters. The geometric parameters were obtained by two-dimensional images analyses, generated by a Microfocus system, with a CCD camera, an images intensifier, a X-rays tube and an automatic system for rotation of the sample. The spatial resolution of the images was about 32 {mu}m. In the gamma rays transmission methodology, a Nal(Tl) scintillation detector, an {sup 241}Am (59.53 keV, 100 mCi) radioactive source and an automatic X-Z micrometric table was used. The analyzed samples had pores density of 30, 45, 60, 80 and 100 ppi (pores per inch). The gamma rays transmission technique was accurate to supply the porosity of the samples, which ranged about 90% and was in agreement with the values supplied by manufacturer of the foams. The 30 and 45 ppi samples analyzed by X-rays microtomography showed porosity results that agree with the average porosity supplied by the manufacturer. In other hand, the 60, 80 and 100 ppi samples systematically showed average porosity about 4%, lower than the average of the manufacturer. The pore size distributions found through the software IMAGO show the presence of smaller pores than those nominated by the manufacturer. The 30 ppi samples had voids inside the solid material of the ceramic foams structure. Gaussian truncated method, used in the three-dimensional reconstruction, was not able to take into the account the voids inside the solid matrix. (author)

  12. Analytical Formulae for Calculation of X-Ray Detector Solid Angles in the Scanning and Scanning/Transmission Analytical Electron Microscope

    Energy Technology Data Exchange (ETDEWEB)

    Zaluzec, Nestor J.

    2014-05-22

    Closed form analytical equations used to calculate the collection solid angle of six common geometries of solid-state X-ray detectors in scanning and scanning/transmission analytical electron microscopy are presented. Using these formulae one can make realistic comparisons of the merits of the different detector geometries in modern electron column instruments. This work updates earlier formulations and adds new detector configurations.

  13. Scanning Transmission Electron microscope Studies of Deep-Frozen Unfixed Muscle Correlated with Spatial Localization of Intracellular Elements by Fluorescent X-Ray Analysis

    Science.gov (United States)

    Bacaner, Marvin; Broadhurst, John; Hutchinson, Thomas; Lilley, John

    1973-01-01

    Thin sections of deep-frozen unfixed muscle were studied in a scanning electron microscope modified for transmission imaging and equipped with a “cryostage” for vacuum compatibility of hydrated tissue. With an energy-dispersive x-ray analysis system, intracellular atomic species in the scan beam path were identified by their fluorescent x-rays and spatially localized in correlation with the electron optical image of the microstructure. Marked differences are noted between the ultrastructure of deep-frozen hydrated muscle and that of fixed dehydrated muscle. In frozen muscle, myofibrils appear to be composed of previously undescribed longitudinal structures between 400-1000 Å wide (“macromyofilaments”). The usual myofilaments, mitochondria, and sarcoplasmic reticulum were not seen unless the tissue was “fixed” before examination. Fluorescent x-ray analysis of the spatial location of constituent elements clearly identified all elements heavier than Na. Intracellular Cl was relatively higher than expected. Images PMID:4587251

  14. Image and diagnosis quality of X-ray image transmission via cell phone camera: a project study evaluating quality and reliability.

    Directory of Open Access Journals (Sweden)

    Hans Goost

    Full Text Available INTRODUCTION: Developments in telemedicine have not produced any relevant benefits for orthopedics and trauma surgery to date. For the present project study, several parameters were examined during assessment of x-ray images, which had been photographed and transmitted via cell phone. MATERIALS AND METHODS: A total of 100 x-ray images of various body regions were photographed with a Nokia cell phone and transmitted via email or MMS. Next, the transmitted photographs were reviewed on a laptop computer by five medical specialists and assessed regarding quality and diagnosis. RESULTS: Due to their poor quality, the transmitted MMS images could not be evaluated and this path of transmission was therefore excluded. Mean size of transmitted x-ray email images was 394 kB (range: 265-590 kB, SD ± 59, average transmission time was 3.29 min ± 8 (CI 95%: 1.7-4.9. Applying a score from 1-10 (very poor - excellent, mean image quality was 5.8. In 83.2 ± 4% (mean value ± SD of cases (median 82; 80-89%, there was agreement between final diagnosis and assessment by the five medical experts who had received the images. However, there was a markedly low concurrence ratio in the thoracic area and in pediatric injuries. DISCUSSION: While the rate of accurate diagnosis and indication for surgery was high with a concurrence ratio of 83%, considerable differences existed between the assessed regions, with lowest values for thoracic images. Teleradiology is a cost-effective, rapid method which can be applied wherever wireless cell phone reception is available. In our opinion, this method is in principle suitable for clinical use, enabling the physician on duty to agree on appropriate measures with colleagues located elsewhere via x-ray image transmission on a cell phone.

  15. Medidas de la felicidad nacional bruta

    NARCIS (Netherlands)

    R. Veenhoven (Ruut)

    2009-01-01

    textabstractResumen. La felicidad está abriéndose hueco en la agenda política, lo cual reclama medir el éxito alcanzado por los distintos países en crear felicidad para un gran número de personas, de un modo análogo a las medidas del éxito en la creación de riqueza, como el PNB. La felicidad se

  16. Operaciones de Flujo de Fluidos. Tema 5: Medida de caudales

    OpenAIRE

    Salcedo Díaz, Raquel

    2011-01-01

    Apuntes del tema 5. Medida de caudales. En este tema se resumen las principales características de los medidores de caudal, analizando de manera especial los que basan su medida en diferencias de presión.

  17. Transmission and fluorescence X-ray absorption spectroscopy cell/flow reactor for powder samples under vacuum or in reactive atmospheres

    KAUST Repository

    Hoffman, A. S.

    2016-07-26

    X-ray absorption spectroscopy is an element-specific technique for probing the local atomic-scale environment around an absorber atom. It is widely used to investigate the structures of liquids and solids, being especially valuable for characterization of solid-supported catalysts. Reported cell designs are limited in capabilities—to fluorescence or transmission and to static or flowing atmospheres, or to vacuum. Our goal was to design a robust and widely applicable cell for catalyst characterizations under all these conditions—to allow tracking of changes during genesis and during operation, both under vacuum and in reactive atmospheres. Herein, we report the design of such a cell and a demonstration of its operation both with a sample under dynamic vacuum and in the presence of gases flowing at temperatures up to 300 °C, showing data obtained with both fluorescence and transmission detection. The cell allows more flexibility in catalyst characterization than any reported.

  18. Microstructural characterization of porous materials by X-ray microtomography and gamma ray transmission techniques; Caracterizacao da microestrutura de materiais porosos por microtomografia de raios X e transmissao de raios gama

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Anderson Camargo

    2006-07-01

    This work presents the application of the X-ray microtomography and gamma ray transmission techniques for the microstructure characterization of different kinds of materials. Total porosity, pore size distribution and the two point correlation functions were measured. The two point correlation function, which allows the reconstruction of 3D models, was carried out for two samples. Seven ceramic tablets of Alumina (Al{sub 2}O{sub 3}), seven tablets of Boron Carbide (B{sub 4}C), three samples of sedimentary rocks and one sample of Titanium foam were analyzed. The experimental set up for the Gamma Ray Transmission technique consisted of: a 2'' x 2'' crystal NaI(Tl) detector, an {sup 241} Am radioactive source (59,53 keV, 100 mCi), an automatic micrometric table for the sample XZ movement and standard gamma spectrometry electronics. Two microtomography systems were used: a Fein Focus system, constituted by an X-ray tube, operated at 160 kV and 0.3 to 1.1 mA, a CCD camera and the movement sample system, and a Skyscan system, model 1072, with a X-ray tube operated at 100 kV and 100{mu}A, and a CCD camera. The ceramic tablets, analyzed by the gamma ray transmission technique presented results for most of the porosities data with smaller confidence intervals and inside the intervals supplied by the tablets manufacturer. The Titanium porous sample was analyzed by the two techniques, its microtomography images achieved a resolution of 17{mu}m, obtained employing the Fein Focus system. For both techniques, this sample showed high porosity, which allows its application for this purpose. The sandstones samples were analyzed by the Skyscan system, achieving resolutions of 19{mu}m, 11{mu}m and 3.8{mu}m for each sample, respectively. The resolutions of 11{mu}m and 3.8{mu}m were the ones that generated better 2D sections for the respective samples and, consequently, more reliable porosities. The 3.8{mu}m resolution was the one that best quantified the pore size

  19. Nanoscale Three-Dimensional Microstructural Characterization of an Sn-Rich Solder Alloy Using High-Resolution Transmission X-Ray Microscopy (TXM)

    Energy Technology Data Exchange (ETDEWEB)

    Kaira, Chandrashekara S.; Mayer, Carl R.; De Andrade, V.; De Carlo, Francesco; Chawla, Nikhilesh

    2016-07-18

    Abstract

    Three-dimensional (3D) nondestructive microstructural characterization was performed using full-field transmission X-ray microscopy on an Sn-rich alloy, at a spatial resolution of 60 nm. This study highlights the use of synchrotron radiation along with Fresnel zone plate optics to perform absorption contrast tomography for analyzing nanoscale features of fine second phase particles distributed in the tin matrix, which are representative of the bulk microstructure. The 3D reconstruction was also used to quantify microstructural details of the analyzed volume.

  20. Observation of coupled vortex gyrations by 70-ps-time and 20-nm-space- resolved full-field magnetic transmission soft x-ray microscopy

    Energy Technology Data Exchange (ETDEWEB)

    Jung, Hyunsung; Yu, Young-Sang; Lee, Ki-Suk; Im, Mi-Young; Fischer, Peter; Bocklage, Lars; Vogel, Andreas; Bolte, Markus; Meier, Guido; Kim, Sang-Koog

    2010-09-01

    We employed time-and space-resolved full-field magnetic transmission soft x-ray microscopy to observe vortex-core gyrations in a pair of dipolar-coupled vortex-state Permalloy (Ni{sub 80}Fe{sub 20}) disks. The 70 ps temporal and 20 nm spatial resolution of the microscope enabled us to simultaneously measure vortex gyrations in both disks and to resolve the phases and amplitudes of both vortex-core positions. We observed their correlation for a specific vortex-state configuration. This work provides a robust and direct method of studying vortex gyrations in dipolar-coupled vortex oscillators.

  1. Characterization by Raman scattering, x-ray diffraction, and transmission electron microscopy of (AlAs)m(InAs)m short period superlattices grown by migration enhanced epitaxy

    DEFF Research Database (Denmark)

    Bradshaw, J.; Song, X.J.; Shealy, J.R.

    1992-01-01

    We report growth of (InAs)1(AlAs)1 and (InAs)2(AlAs)2 strained layer superlattices by migration enhanced epitaxy. The samples were grown on InP (001) substrates and characterized by Raman spectroscopy, x-ray diffraction, and transmission electron microscopy. Satellite peaks in the x-ray data...... confirm the intended periodicity and indicate the presence of some disorder in the monolayer sample. The energies of the zone folded and quantum confined optic phonons are in reasonable agreement with calculations based on one-dimensional elastic continuum and linear chain models. Journal of Applied...... Physics is copyrighted by The American Institute of Physics....

  2. 3D chemical mapping: application of scanning transmission (soft) X-ray microscopy (STXM) in combination with angle-scan tomography in bio-, geo-, and environmental sciences.

    Science.gov (United States)

    Obst, Martin; Schmid, Gregor

    2014-01-01

    The identification of environmental processes and mechanisms often requires information on the organochemical and inorganic composition of specimens at high spatial resolution. X-ray spectroscopy (XAS) performed in the soft X-ray range (100-2,200 eV) provides chemical speciation information for elements that are of high biogeochemical relevance such as carbon, nitrogen, and oxygen but also includes transition metals such as iron, manganese, or nickel. Synchrotron-based scanning transmission X-ray microscopy (STXM) combines XAS with high resolution mapping on the 20-nm scale. This provides two-dimensional (2D) quantitative information about the distribution of chemical species such as organic macromolecules, metals, or mineral phases within environmental samples. Furthermore, the combination of STXM with angle-scan tomography allows for three-dimensional (3D) spectromicroscopic analysis of bio-, geo-, or environmental samples. For the acquisition of STXM tomography data, the sample is rotated around an axis perpendicular to the X-ray beam. Various sample preparation approaches such as stripes cut from TEM grids or the preparation of wet cells allow for preparing environmentally relevant specimens in a dry or in a fully hydrated state for 2D and 3D STXM measurements. In this chapter we give a short overview about the principles of STXM, its application to environmental sciences, different preparation techniques, and the analysis and 3D reconstruction of STXM tomography data.

  3. Comparison of experimental and theoretical X-ray intensities from (In)GaAs specimens investigated by energy-dispersive X-ray spectroscopy in a transmission electron microscope

    Energy Technology Data Exchange (ETDEWEB)

    Walther, T, E-mail: t.walther@sheffield.ac.u [Department of Electronic and Electrical Engineering, University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield S1 3JD (United Kingdom)

    2010-02-01

    Experimental measurements of X-ray line intensity ratios in a transmission electron microscope are compared over several orders of magnitude of sample thicknesses, from the nm- to the mm- range, with Monte-Carlo simulations using two different software packages. It is shown that the form of the thickness dependence of the K/L ratio of characteristic X-ray lines for GaAs is reproduced qualitatively, but the numerical differences between software packages are large. A scheme is presented for improving the simple k-factor method, taking explicitly into account the thickness dependence that remains even after application of the usual absorption and fluorescence corrections. This is done in first-order approximation by linear regression. The improvement in determining the correct indium concentration in specimens of InGaAs is calculated to be 1at%.

  4. Soft x-ray reflectometry, hard x-ray photoelectron spectroscopy and transmission electron microscopy investigations of the internal structure of TiO2(Ti/SiO2/Si stacks

    Directory of Open Access Journals (Sweden)

    Elena O Filatova, Igor V Kozhevnikov, Andrey A Sokolov, Evgeniy V Ubyivovk, Sergey Yulin, Mihaela Gorgoi and Franz Schäfers

    2012-01-01

    Full Text Available We developed a mathematical analysis method of reflectometry data and used it to characterize the internal structure of TiO2/SiO2/Si and Ti/SiO2/Si stacks. Atomic concentration profiles of all the chemical elements composing the samples were reconstructed from the analysis of the reflectivity curves measured versus the incidence angle at different soft x-ray reflection (SXR photon energies. The results were confirmed by the conventional techniques of hard x-ray photoelectron spectroscopy (HXPES and high-resolution transmission electron microscopy (HRTEM. The depth variation of the chemical composition, thicknesses and densities of individual layers extracted from SXR and HXPES measurements are in close agreement and correlate well with the HRTEM images.

  5. Component analyses of urinary nanocrystallites of uric acid stone formers by combination of high-resolution transmission electron microscopy, fast Fourier transformation, energy dispersive X-ray spectroscopy, X-ray diffraction and Fourier transform infrared spectroscopy.

    Science.gov (United States)

    Sun, Xin-Yuan; Xue, Jun-Fa; Xia, Zhi-Yue; Ouyang, Jian-Ming

    2015-06-01

    This study aimed to analyse the components of nanocrystallites in urines of patients with uric acid (UA) stones. X-ray diffraction (XRD), Fourier transform infrared spectroscopy, high-resolution transmission electron microscopy (HRTEM), fast Fourier transformation (FFT) of HRTEM, and energy dispersive X-ray spectroscopy (EDS) were performed to analyse the components of these nanocrystallites. XRD and FFT showed that the main component of urinary nanocrystallites was UA, which contains a small amount of calcium oxalate monohydrate and phosphates. EDS showed the characteristic absorption peaks of C, O, Ca and P. The formation of UA stones was closely related to a large number of UA nanocrystallites in urine. A combination of HRTEM, FFT, EDS and XRD analyses could be performed accurately to analyse the components of urinary nanocrystallites.

  6. Medidas de pobreza: un enfoque alternativo

    OpenAIRE

    Lazzari, Luisa L; María José Fernandez

    2006-01-01

    Una medida creíble de pobreza e indigencia puede ser un poderoso instrumento para concentrar la atención del policymaker en las condiciones de vida de los pobres. Las opciones elegidas para fijarlas tienen gran importancia para las decisiones políticas a tomar. El método indirecto o enfoque del ingreso parte de la valorización de una Canasta Básica Alimentaria (CBA) que determina la cantidad de calorías mínimas necesarias para satisfacer las necesidades biológicas básicas de...

  7. Elemental and Chemical Mapping of High Capacity Intermetallic Li-ion Anodes with Transmission X-ray Microscopy

    Science.gov (United States)

    Ausderau, Logan J.; Gonzalez Malabet, Hernando J.; Buckley, Joseph R.; De Andrade, Vincent; Liu, Yijin; Nelson, George J.

    2017-09-01

    X-ray nanotomography has been applied toward the three-dimensional (3D) imaging of a Li-ion battery alloy anode material (Cu6Sn5), and subsequent segmentation and analysis has been performed to distinguish the alloy material from its constituent components. Follow-on x-ray absorption near edge structure imaging was performed yielding absorption spectra for Cu, Cu6Sn5, and Li2CuSn. Analyses based on these spectra were performed on two-dimensional (2D) images of samples from cycled electrodes to assess chemical composition in Cu-containing phases. The capability to distinguish the different materials within mixed samples suggests that microstructure and composition changes resulting from lithiation and delithiation in Cu6Sn5 may be observed and better understood with 3D x-ray imaging methods. These methods are expected to be applicable to other intermetallic tin alloy electrodes.

  8. A freeze-fracture transmission electron microscopy and small angle x-ray diffraction study of the effects of albumin, serum, and polymers on clinical lung surfactant microstructure.

    Science.gov (United States)

    Braun, Andreas; Stenger, Patrick C; Warriner, Heidi E; Zasadzinski, Joseph A; Lu, Karen W; Taeusch, H William

    2007-07-01

    Freeze-fracture transmission electron microscopy shows significant differences in the bilayer organization and fraction of water within the bilayer aggregates of clinical lung surfactants, which increases from Survanta to Curosurf to Infasurf. Albumin and serum inactivate all three clinical surfactants in vitro; addition of the nonionic polymers polyethylene glycol, dextran, or hyaluronic acid also reduces inactivation in all three. Freeze-fracture transmission electron microscopy shows that polyethylene glycol, hyaluronic acid, and albumin do not adsorb to the surfactant aggregates, nor do these macromolecules penetrate the interior water compartments of the surfactant aggregates. This results in an osmotic pressure difference that dehydrates the bilayer aggregates, causing a decrease in the bilayer spacing as shown by small angle x-ray scattering and an increase in the ordering of the bilayers as shown by freeze-fracture electron microscopy. Small angle x-ray diffraction shows that the relationship between the bilayer spacing and the imposed osmotic pressure for Curosurf is a screened electrostatic interaction with a Debye length consistent with the ionic strength of the solution. The variation in surface tension due to surfactant adsorption measured by the pulsating bubble method shows that the extent of surfactant aggregate reorganization does not correlate with the maximum or minimum surface tension achieved with or without serum in the subphase. Albumin, polymers, and their mixtures alter the surfactant aggregate microstructure in the same manner; hence, neither inhibition reversal due to added polymer nor inactivation due to albumin is caused by alterations in surfactant microstructure.

  9. Binary pseudo-random patterned structures for modulation transfer function calibration and resolution characterization of a full-field transmission soft x-ray microscope

    Energy Technology Data Exchange (ETDEWEB)

    Yashchuk, V. V., E-mail: VVYashchuk@lbl.gov; Chan, E. R.; Lacey, I. [Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Fischer, P. J. [Center for X-Ray Optics, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Physics Department, University of California Santa Cruz, Santa Cruz, California 94056 (United States); Conley, R. [Advance Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973 (United States); McKinney, W. R. [Diablo Valley College, 321 Golf Club Road, Pleasant Hill, California 94523 (United States); Artemiev, N. A. [KLA-Tencor Corp., 1 Technology Drive, Milpitas, California 95035 (United States); Bouet, N. [National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973 (United States); Cabrini, S. [Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Calafiore, G.; Peroz, C.; Babin, S. [aBeam Technologies, Inc., Hayward, California 94541 (United States)

    2015-12-15

    We present a modulation transfer function (MTF) calibration method based on binary pseudo-random (BPR) one-dimensional sequences and two-dimensional arrays as an effective method for spectral characterization in the spatial frequency domain of a broad variety of metrology instrumentation, including interferometric microscopes, scatterometers, phase shifting Fizeau interferometers, scanning and transmission electron microscopes, and at this time, x-ray microscopes. The inherent power spectral density of BPR gratings and arrays, which has a deterministic white-noise-like character, allows a direct determination of the MTF with a uniform sensitivity over the entire spatial frequency range and field of view of an instrument. We demonstrate the MTF calibration and resolution characterization over the full field of a transmission soft x-ray microscope using a BPR multilayer (ML) test sample with 2.8 nm fundamental layer thickness. We show that beyond providing a direct measurement of the microscope’s MTF, tests with the BPRML sample can be used to fine tune the instrument’s focal distance. Our results confirm the universality of the method that makes it applicable to a large variety of metrology instrumentation with spatial wavelength bandwidths from a few nanometers to hundreds of millimeters.

  10. Medidas tipográficas: un recuento

    Directory of Open Access Journals (Sweden)

    Oriol Moret Viñals

    2015-07-01

    Full Text Available Breve repaso al desarrollo de la concepción métrica en la tipografía en plomo, alternativa y complemento de la visión habitual en lo que conocemos como “tipometría”. Se parte de una noción amplia de medida: el factor cuantitativo se dilata con la articulación de relaciones proporcionales e integra la dimensión cualitativa de los sistemas métricos tradicionales. La tipografía se considera bajo presupuestos similares: como sistema articulado de piezas materiales cuyas magnitudes contienen usos y valores específicos, más allá de su simple expresión numérica. Con tales premisas, se revisan fuentes documentales significativas del “período de la imprenta manual”. Su examen, vinculado a los usos y costumbres de oficio, desvela la distinta aproximación métrica, que puede resumirse en tres fases evolutivas: hermética, intensiva, expansiva –como recogen las referencias de los cuerpos tipográficos: adjetivas, sustantivas, numéricas. Se proporciona así un marco para apreciar el cambio de sentido en las medidas tipográficas hasta nuestros días.

  11. Arbitraje internacional y toma de medidas cautelares

    Directory of Open Access Journals (Sweden)

    Liliana Etel Rapallini

    2014-03-01

    Full Text Available Sin lugar a dudas, la evolución del arbitraje de Derecho Privado Comercial Internacional tanto como Regional ha evidenciado progresos técnicos como jurídicos. Sólo basta con reparar en la influencia cada vez más notoria de la “lex mercatoria”, en el avance en el uso de la video conferencia y otros medios de comunicación virtual, hasta llegar hoy día a la instalación progresiva del arbitraje “on-line” .Pese a ello, y a la difusión del procedimiento arbitral, el mismo coexiste con áreas aún discutidas que operan como un velo u obstáculo sobre su celeridad y eficacia .Las áreas que adolecen son conocidas y una de ellas responde a la toma de medidas cautelares sin recurrencia a la justicia estadual. Pese a tratarse de una medida de cooperación jurídica, escaso ha sido el avance en las fuentes normativas.

  12. Operadores pseudodiferenciales definidos en medidas de Borel

    Directory of Open Access Journals (Sweden)

    Duván Cardona

    2013-06-01

    Full Text Available En este trabajo se introduce un tipo de operadores pseudodiferenciales definidos en medidas de Borel. Clásicamente la definición de operadores pseudodiferenciales se extiende al espacio de las distribuciones temperadas; sin embargo, en su representación no interviene el análisis de Fourier en espacios de medidas. El objetivo principal es definir tales operadores en un ángulo diferente y establecer resultados de continuidad entre espacios normados adecuados, además de proporcionar una conexión con la teoría de operadores pseudodiferenciales con símbolos en las clases S m ρ,δ definidas en R n y el toro T n. In this paper we introduce a type of pseudo-differential operators defined on Borel measures. Classically the definition of pseudo-differential operators extends the tempered distributions space, but in its representation does not intervene the Fourier analysis in measures spaces. The main objective is to define such operators at a different angle and establish boundedness results on suitable normed spaces, in addition to providing a connection with the pseudo-differential operators theory with symbols in the classes S m ρ,δ de- fined on R n and the torus T n.

  13. Quantitative X-ray Elemental Imaging in Plant Materials at the Subcellular Level with a Transmission Electron Microscope: Applications and Limitations

    Directory of Open Access Journals (Sweden)

    Shaoliang Chen

    2014-04-01

    Full Text Available Energy-dispersive X-ray microanalysis (EDX is a technique for determining the distribution of elements in various materials. Here, we report a protocol for high-spatial-resolution X-ray elemental imaging and quantification in plant tissues at subcellular levels with a scanning transmission electron microscope (STEM. Calibration standards were established by producing agar blocks loaded with increasing KCl or NaCl concentrations. TEM-EDX images showed that the salts were evenly distributed in the agar matrix, but tended to aggregate at high concentrations. The mean intensities of K+, Cl−, and Na+ derived from elemental images were linearly correlated to the concentrations of these elements in the agar, over the entire concentration range tested (R > 0.916. We applied this method to plant root tissues. X-ray images were acquired at an actual resolution of 50 nm ´ 50 nm to 100 nm ´ 100 nm. We found that cell walls exhibited higher elemental concentrations than vacuoles. Plants exposed to salt stress showed dramatic accumulation of Na+ and Cl− in the transport tissues, and reached levels similar to those applied in the external solution (300 mM. The advantage of TEM-EDX mapping was the high-spatial-resolution achieved for imaging elemental distributions in a particular area with simultaneous quantitative analyses of multiple target elements.

  14. A Scanning Transmission X-ray Microscopy Study of Cubic and Orthorhombic C3A and Their Hydration Products in the Presence of Gypsum

    Directory of Open Access Journals (Sweden)

    Vanessa Rheinheimer

    2016-08-01

    Full Text Available This paper shows the microstructural differences and phase characterization of pure phases and hydrated products of the cubic and orthorhombic (Na-doped polymorphs of tricalcium aluminate (C3A, which are commonly found in traditional Portland cements. Pure, anhydrous samples were characterized using scanning transmission X-ray microscopy (STXM, X-ray photoelectron spectroscopy (XPS and X-ray diffraction (XRD and demonstrated differences in the chemical and mineralogical composition as well as the morphology on a micro/nano-scale. C3A/gypsum blends with mass ratios of 0.2 and 1.9 were hydrated using a water/C3A ratio of 1.2, and the products obtained after three days were assessed using STXM. The hydration process and subsequent formation of calcium sulfate in the C3A/gypsum systems were identified through the changes in the LIII edge fine structure for Calcium. The results also show greater Ca LII binding energies between hydrated samples with different gypsum contents. Conversely, the hydrated samples from the cubic and orthorhombic C3A at the same amount of gypsum exhibited strong morphological differences but similar chemical environments.

  15. A comparative transmission electron microscopy, energy dispersive x-ray spectroscopy and spatially resolved micropillar compression study of the yttria partially stabilised zirconia - porcelain interface in dental prosthesis

    Energy Technology Data Exchange (ETDEWEB)

    Lunt, Alexander J.G., E-mail: alexander.lunt@chch.ox.ac.uk [Department of Engineering Science, University of Oxford, Parks Road, Oxford, Oxfordshire OX1 3PJ (United Kingdom); Mohanty, Gaurav, E-mail: gaurav.mohanty@empa.ch [EMPA Materials Science & Technology, Feuerwerkerstrasse 39, CH-3602 Thun (Switzerland); Ying, Siqi, E-mail: siqi.ying@eng.ox.ac.uk [Department of Engineering Science, University of Oxford, Parks Road, Oxford, Oxfordshire OX1 3PJ (United Kingdom); Dluhoš, Jiří, E-mail: jiri.dluhos@tescan.cz [TESCAN Brno, s.r.o., Libušina tř. 1, 623 00 Brno-Kohoutovice (Czech Republic); Sui, Tan, E-mail: tan.sui@eng.ox.ac.uk [Department of Engineering Science, University of Oxford, Parks Road, Oxford, Oxfordshire OX1 3PJ (United Kingdom); Neo, Tee K., E-mail: neophyte@singnet.com.sg [Specialist Dental Group, Mount Elizabeth Orchard, 3 Mount Elizabeth, #08-03/08-08/08-10, 228510 (Singapore); Michler, Johann, E-mail: johann.michler@empa.ch [EMPA Materials Science & Technology, Feuerwerkerstrasse 39, CH-3602 Thun (Switzerland); Korsunsky, Alexander M., E-mail: alexander.korsunsky@eng.ox.ac.uk [Department of Engineering Science, University of Oxford, Parks Road, Oxford, Oxfordshire OX1 3PJ (United Kingdom)

    2015-12-01

    Recent studies into the origins of failure of yttria partially stabilised zirconia–porcelain veneered prosthesis have revealed the importance of micro-to-nano scale characterisation of this interface zone. Current understanding suggests that the heat treatment, residual stresses and varying microstructure at this location may contribute to near-interface porcelain chipping. In this study the chemical, microstructural and mechanical property variation across the interfacial zone has been characterised at two differing length scales and using three independent techniques; energy dispersive X-ray spectroscopy, transmission electron microscopy and micropillar compression. Energy dispersive X-ray spectroscopy mapping of the near-interface region revealed, for the first time, that the diffusional lengths of twelve principal elements are limited to within 2–6 μm of the interface. This study also revealed that 0.2–2 μm diameter zirconia grains had become detached from the bulk and were embedded in the near-interface porcelain. Transmission electron microscopy analysis demonstrated the presence of nanoscale spherical features, indicative of tensile creep induced voiding, within the first 0.4–1.5 μm from the interface. Within zirconia, variations in grain size and atomistic structure were also observed within the 3 μm closest to the interface. Micropillar compression was performed over a 100 μm range on either side of the interface at the spatial resolution of 5 μm. This revealed an increase in zirconia and porcelain loading modulus at close proximities (< 5 μm) to the interface and a decrease in zirconia modulus at distances between 6 and 41 μm from this location. The combination of the three experimental techniques has revealed intricate details of the microstructural, chemical and consequently mechanical heterogeneities in the YPSZ–porcelain interface, and demonstrated that the length scales typically associated with this behaviour are approximately ± 5

  16. Medida de goniofluorescencia en materiales fotoluminiscentes

    OpenAIRE

    Bernad, Berta; Ferrero, Alejandro; Velázquez, J.L.; Pons Aglio, Alicia; Hernanz, María Luisa; Chorro, E.; Perales, E.; Martínez-Verdú, F.M.; Borreguero, E.; Campos Acosta, Joaquín

    2015-01-01

    Se ha medido la función de distribución de la luminiscencia bidireccional (BLDF) para seis patrones de fluorescencia bajo diferentes geometrías de observación y detección. Estas medidas se realizaron con el gonioespectrofotómetro GEFE, usando iluminación monocromática y un espectrorradiómetro como detector. Se encontró que, en general, que la forma en que variaba la fluorescencia era la misma para todo patrón y dirección de irradiación: variación simétrica con el ángulo de detección (¿d) resp...

  17. Dosimetric optimization of a truncated conical-shaped transmission target for electronic brachytherapy X-ray source: A Monte Carlo study

    Science.gov (United States)

    Ahn, Woo Sang; Choi, Wonsik; Cho, Byungchul; Kwak, Jungwon; Ahn, Seung Do; Kim, Hyun Jin; Cho, Sung Oh; Park, Sung Ho; Shin, Seong Soo

    2017-08-01

    The purpose of this study is to determine the optimal target configurations to improve the uniformity of dose distribution for the electronic brachytherapy source. A truncated conical-shaped transmission type was designed. Monte Carlo simulation technique was used to investigate the target thickness, geometry of electron beam, and target angle of a truncated conical-shaped target for the electronic brachytherapy X-ray source. Dosimetric parameters recommended by TG-43U1 protocol were used to determine the optimal target design of electronic brachytherapy source. The target thicknesses for maximizing the transmitted X-ray intensity were approximately 1.2 to 1.5 μm for 0° and 90°. In a range of optimal thickness, transmitted X-ray intensity at 90° was approximately 92% of maximum photon intensity. The effects of electron beam shapes on 2D anisotropy functions were investigated at radial distances of 0.5, 1.0, 2.0, 3.0, and 5.0 cm. Minimum variations for all radiation distances and angular ranges were observed for uniform cylindrical electron beam with a radius of 2.0 mm. Anisotropy functions at 0°, F( r, 0° ), were close to unity and slightly more than unity for non-uniform cylindrical ( R = 1.0 - 2.0 mm) electron beam and uniform cylindrical electron beam with a radius of 2.0 mm. The angles of target anode between 45° and 50° show minimum fluctuations in the anisotropy functions and are close to unity for F( r, 0° ). The optimal target configurations are a truncated conical-shaped target having an angle between 45° and 50°. It is concluded that tungsten target having the thickness of 1.2 to 1.5 μm and uniform circular with a radius of 2.0 mm as electron beam produces optimal dosimetric characteristics for electronic brachytherapy X-ray source.

  18. Scanning and transmission electron microscopy of a craniopharyngioma: x-ray microanalytical study of the intratumoral mineralized deposits

    Energy Technology Data Exchange (ETDEWEB)

    Vilches, J.; Lopez, A.; Martinez, M.C.; Gomez, J.; Barbera, J.

    This paper discusses the value of scanning electron microscopy (SEM) and x-ray microanalysis in the classification of craniopharyngiomas. This neoplasm shows epithelial nest, cords of cuboid cells, foci of squamous metaplasia, and microcystic degeneration. SEM reveals that the epithelial cysts are lined with elongated cells that possess numerous microvilli and blebs and that some cysts are lined with polyhedral cells. The microvilli are interpreted as characteristic of the fast growing craniopharyngiomas. A microanalytical study of the calcified areas reveals the presence of magnesium, phosphorus, and calcium.

  19. Polycapillary lenses for soft x-ray transmission in ITER: Model, comparison with experiments, and potential application

    Energy Technology Data Exchange (ETDEWEB)

    Mazon, D., E-mail: Didier.Mazon@cea.fr; Jardin, A. [CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France); Liegeard, C. [Ecole Polytechnique de Paris, Paris (France); Barnsley, R.; Walsh, M.; Sirinelli, A. [ITER Organization, Saint-Paul-lez-Durance (France); O’Mullane, M. [Department of Physics SUPA, University of Strathclyde, Glasgow G4 ONG (United Kingdom); Dorchies, F. [University Bordeaux, CNRS, CEA, CELIA, UMR5107, Talence 33405 (France)

    2016-11-15

    Measuring Soft X-Ray (SXR) radiation [0.1 keV; 15 keV] in tokamaks is a standard way of extracting valuable information on the particle transport and magnetohydrodynamic activity. Generally, the analysis is performed with detectors positioned close to the plasma for a direct line of sight. A burning plasma, like the ITER deuterium-tritium phase, is too harsh an environment to permit the use of such detectors in close vicinity of the machine. We have thus investigated in this article the possibility of using polycapillary lenses in ITER to transport the SXR information several meters away from the plasma in the complex port-plug geometry.

  20. Discharge products of ionic liquid-based Li-O2 batteries observed by energy dependent soft x-ray transmission microscopy

    Science.gov (United States)

    Olivares-Marín, Mara; Sorrentino, Andrea; Pereiro, Eva; Tonti, Dino

    2017-08-01

    Products deposited on an O2-cathode discharged in ionic liquid electrolytes are analyzed by transmission soft X-ray microscopy (TXM) and compared to ether-based electrolytes, showing differences in morphology and chemical compositions. With both solvents we observe Li2O2 and LiO2 primary products in similar proportions. However, while as previously observed in tetraglyme an important reactivity takes place producing significant amount of carbonates, in ionic liquid-based electrolytes the formation of carbonates was almost negligible, confirming higher stability. Only when sample is intentionally air exposed before analysis, significant amounts of carbonates came up. However, LiOH crystallites are clearly recognized with the ionic liquid electrolyte. The abundance of these crystallites depends on both the LiTFSI concentration and the storage time of discharged electrodes, suggesting that they result from the reaction of water trace with primary discharge products.

  1. Preliminary experimental research to detect grease stain of petroleum pipeline by sup 1 sup 3 sup 7 Cs gamma-ray transmission method

    CERN Document Server

    Wang Shi Heng

    2002-01-01

    The experimental study on the detection of grease stain for petroleum pipeline in Karamay oil-field of Xinjiang is carried out by gamma-ray transmission method. Experimental provision consists of sup 1 sup 3 sup 7 Cs gamma radiator and NaI(Tl) scintillation detector. The response of grease stain thickness of petroleum pipeline in Karamay oil-field is ln(N sub 0 /N)=0.00548 d-0.0046, and the response of paraffin thickness is ln(N sub 0 /N)=0.00522d-0.0126. The result of experiment indicates that the response of grease stain thickness is more sensitive than the response of paraffin thickness

  2. Medidas interinas de protección en arbitraje CIADI

    OpenAIRE

    Andrea Camargo García

    2011-01-01

    Durante la solicitud de medidas provisionales, es posible encontrarse en circunstancias apremiantes susceptibles de justificar la exigencia de una protección inmediata del tribunal mientras este decide la solicitud de medidas provisionales. En este contexto, algunos demandantes en casos ante el CIADI han incluido, de forma complementaria, una petición para que se emita una medida interina de protección en el marco de sus solicitudes de medidas provisionales. Tal petición está destinada a obte...

  3. Revealing the synergetic effects in Ni nanoparticle-carbon nanotube hybrids by scanning transmission X-ray microscopy and their application in the hydrolysis of ammonia borane

    Science.gov (United States)

    Zhao, Guanqi; Zhong, Jun; Wang, Jian; Sham, Tsun-Kong; Sun, Xuhui; Lee, Shuit-Tong

    2015-05-01

    The hybrids of carbon nanotubes (CNTs) and the supported Ni nanoparticles (NPs) have been studied by scanning transmission X-ray microscopy (STXM) and tested by the hydrolysis reaction of ammonia borane (AB, NH3BH3). Data clearly showed the existence of a strong interaction between Ni NPs and thin CNTs (C-O-Ni bonds), which favored the tunable (buffer) electronic structure of Ni NPs facilitating the catalytic process. The hydrolysis process of AB confirmed the hypothesis that the hybrids with a strong interfacial interaction would show superior catalytic performance, while the hybrids with a weak interfacial interaction show poor performance. Our results provide a wealth of detailed information regarding the electronic structure of the NP-CNT hybrids and provide guidance towards the rational design of high-performance catalysts for energy applications.The hybrids of carbon nanotubes (CNTs) and the supported Ni nanoparticles (NPs) have been studied by scanning transmission X-ray microscopy (STXM) and tested by the hydrolysis reaction of ammonia borane (AB, NH3BH3). Data clearly showed the existence of a strong interaction between Ni NPs and thin CNTs (C-O-Ni bonds), which favored the tunable (buffer) electronic structure of Ni NPs facilitating the catalytic process. The hydrolysis process of AB confirmed the hypothesis that the hybrids with a strong interfacial interaction would show superior catalytic performance, while the hybrids with a weak interfacial interaction show poor performance. Our results provide a wealth of detailed information regarding the electronic structure of the NP-CNT hybrids and provide guidance towards the rational design of high-performance catalysts for energy applications. Electronic supplementary information (ESI) available: Magnified TEM images, high resolution TEM images and the particle size distributions of the samples, the STXM results of a thick tube at different positions, XPS results, stability test. See DOI: 10.1039/c5nr01168j

  4. Uncertainty evaluation of fluid dynamic models and validation by gamma ray transmission measurements of the catalyst flow in a FCC cold pilot unity

    Energy Technology Data Exchange (ETDEWEB)

    Teles, Francisco A.S.; Santos, Ebenezer F.; Dantas, Carlos C., E-mail: francisco.teles@ufpe.br [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Centro de Tecnologia e Geociencias. Departamento de Energia Nuclear; Melo, Silvio B., E-mail: sbm@cin.ufpe.br [Universidade Federal de Pernambuco (CIN/UFPE), Recife, PE (Brazil). Centro de Informatica; Santos, Valdemir A. dos, E-mail: vas@unicap.br [Universidade Catolica de Pernambuco (UNICAP), Recife, PE (Brazil). Dept. de Quimica; Lima, Emerson A.O., E-mail: emathematics@gmail.com [Universidade de Pernambuco (POLI/UPE), Recife, PE (Brazil). Escola Politecnica

    2013-07-01

    In this paper, fluid dynamics of Fluid Catalytic Cracking (FCC) process is investigated by means of a Cold Flow Pilot Unit (CFPU) constructed in Plexiglas to visualize operational conditions. Axial and radial catalyst profiles were measured by gamma ray transmission in the riser of the CFPU. Standard uncertainty was evaluated in volumetric solid fraction measurements for several concentrations at a given point of axial profile. Monitoring of the pressure drop in riser shows a good agreement with measured standard uncertainty data. A further evaluation of the combined uncertainty was applied to volumetric solid fraction equation using gamma transmission data. Limit condition of catalyst concentration in riser was defined and simulation with random numbers provided by MATLAB software has tested uncertainty evaluation. The Guide to the expression of Uncertainty in Measurement (GUM) is based on the law of propagation of uncertainty and on the characterization of the quantities measured by means of either a Gaussian distribution or a t-distribution, which allows measurement uncertainty to be delimited by means of a confidence interval. A variety of supplements to GUM are being developed, which will progressively enter into effect. The first of these supplements [3] describes an alternative procedure for the calculation of uncertainties: the Monte Carlo Method (MCM).MCM is an alternative to GUM, since it performs a characterization of the quantities measured based on the random sampling of the probability distribution functions. This paper also explains the basic implementation of the MCM method in MATLAB. (author)

  5. In situ observation of Cu-Ni alloy nanoparticle formation by X-ray diffraction, X-ray absorption spectroscopy, and transmission electron microscopy: Influence of Cu/Ni ratio

    DEFF Research Database (Denmark)

    Wu, Qiongxiao; Duchstein, Linus Daniel Leonhard; Chiarello, Gian Luca

    2014-01-01

    Silica-supported, bimetallic Cu-Ni nanomaterials were prepared with different ratios of Cu to Ni by incipient wetness impregnation without a specific calcination step before reduction. Different in situ characterization techniques, in particular transmission electron microscopy (TEM), X-ray diffr......Silica-supported, bimetallic Cu-Ni nanomaterials were prepared with different ratios of Cu to Ni by incipient wetness impregnation without a specific calcination step before reduction. Different in situ characterization techniques, in particular transmission electron microscopy (TEM), X......, which results in improved reducibility of the Ni species compared with monometallic Ni. At high Ni concentrations silica-supported Cu-Ni alloys form a homogeneous solid solution of Cu and Ni, whereas at lower Ni contents Cu and Ni are partly segregated and form metallic Cu and Cu-Ni alloy phases. Under...... the same reduction conditions, the particle sizes of reduced Cu-Ni alloys decrease with increasing Ni content. Estimates of the metal surface area from sulfur chemisorption and from the XRD particle size generally agree well on the trend across the composition range, but show some disparity in terms...

  6. New pathways for improved quantification of energy-dispersive X-ray spectra of semiconductors with multiple X-ray lines from thin foils investigated in transmission electron microscopy.

    Science.gov (United States)

    Parri, M C; Qiu, Y; Walther, T

    2015-12-01

    Theoretical approaches to quantify the chemical composition of bulk and thin-layer specimens using energy-dispersive X-ray spectroscopy in a transmission electron microscope are compared to experiments investigating (In)GaAs and Si(Ge) semiconductors. Absorption correctors can be improved by varying the take-off angle to determine the depth of features within the foil or the samples thickness, or by definition of effective k-factors that can be obtained from plots of k-factors versus foil thickness or, preferably, versus the K/L intensity ratio for a suitable element. The latter procedure yields plots of self-consistent absorption corrections that can be used to determine the chemical composition, iteratively for SiGe using a set of calibration curves or directly from a single calibration curve for InGaAs, for single X-ray spectra without knowledge of sample thickness, density or mass absorption coefficients. © 2015 The Authors Journal of Microscopy © 2015 Royal Microscopical Society.

  7. X-RAY TRANSMISSION AND REFLECTION THROUGH A COMPTON-THICK MEDIUM VIA MONTE-CARLO SIMULATIONS

    Directory of Open Access Journals (Sweden)

    Wiebke Eikmann

    2014-06-01

    Full Text Available The spectral shape of an X-ray source strongly depends on the amount and distribution of the surrounding material. The spectrum of a primary source which is located in an optically thin medium with respect to Compton scattering is mainly modified by photo absorption in the lower energy range and is almost unaltered above ~ 10 keV. This picture changes when the source is obscured by gas exceeding hydrogen column densities of ~ 1024 cm−2. At this degree of absorption it is likely that photons are scattered at least twice before leaving the medium. The multiple scatterings lead to a lack of photons in the high energy range of the resulting spectrum as well as to an accumulation of photons at moderate energies forming the so-called Compton-bump. The shape of the fluorescent lines also changes since scattered line photons form several Compton-shoulders which are very prominent especially for Compton-thick sources. Using a Monte Carlo method, we demonstrate the importance of Compton scattering for high column densities. For that purpose, we compare our results with existing absorption models that do not consider Compton scattering. These calculations will be implemented in a prospective version of the tbabs absorption model including an analytic evaluation of the strength of the fluorescent lines.

  8. Medidas interinas de protección en arbitraje CIADI

    Directory of Open Access Journals (Sweden)

    Andrea Camargo García

    2014-12-01

    Full Text Available Durante la solicitud de medidas provisionales, es posible encontrarse en circunstancias apremiantes susceptibles de justificar la exigencia de una protección inmediata del tribunal mientras este decide la solicitud de medidas provisionales. En este contexto, algunos demandantes en casos ante el CIADI han incluido, de forma complementaria, una petición para que se emita una medida interina de protección en el marco de sus solicitudes de medidas provisionales. Tal petición está destinada a obtener del tribunal arbitral una recomendación que prohíba a la contraparte alterar el statu quo y agravar la controversia, mientras tiene lugar la sustanciación y decisión de la medida provisional de fondo. Los Tribunales Arbitrales CIADI, al estar frente a tal tipo de solicitudes, se han encontrado con la dificultad de no encontrar ningún tipo de previsión en la Convención CIADI o en las Reglas de Arbitraje CIADI, que contemple expresamente la facultad para dictar medidas interinas de protección. Ante similar dificultad se han enfrentado otros tribunales internacionales, los cuales han concluido que la facultad de dictar medidas interinas de protección se encuentra implícita en la facultad de dictar medidas provisionales y se basa en los principios generales del derecho internacional que fundamentan la facultad para dictar medidas provisionales. La práctica adoptada por estos tribunales internacionales ante la solicitud de medidas interinas de protección, es de gran utilidad para los tribunales arbitrales CIADI, toda vez que estos tribunales deben decidir conforme a los principios generales del derecho, tal y como lo dispone el artículo 42 de la Convención.

  9. Medidas interinas de protección en arbitraje CIADI

    Directory of Open Access Journals (Sweden)

    Andrea Camargo García

    2011-12-01

    Full Text Available Durante la solicitud de medidas provisionales, es posible encontrarse en circunstancias apremiantes susceptibles de justificar la exigencia de una protección inmediata del tribunal mientras este decide la solicitud de medidas provisionales. En este contexto, algunos demandantes en casos ante el CIADI han incluido, de forma complementaria, una petición para que se emita una medida interina de protección en el marco de sus solicitudes de medidas provisionales. Tal petición está destinada a obtener del tribunal arbitral una recomendación que prohíba a la contraparte alterar el statu quo y agravar la controversia, mientras tiene lugar la sustanciación y decisión de la medida provisional de fondo. Los Tribunales Arbitrales CIADI, al estar frente a tal tipo de solicitudes, se han encontrado con la dificultad de no encontrar ningún tipo de previsión en la Convención CIADI o en las Reglas de Arbitraje CIADI, que contemple expresamente la facultad para dictar medidas interinas de protección. Ante similar dificultad se han enfrentado otros tribunales internacionales, los cuales han concluido que la facultad de dictar medidas interinas de protección se encuentra implícita en la facultad de dictar medidas provisionales y se basa en los principios generales del derecho internacional que fundamentan la facultad para dictar medidas provisionales. La práctica adoptada por estos tribunales internacionales ante la solicitud de medidas interinas de protección, es de gran utilidad para los tribunales arbitrales CIADI, toda vez que estos tribunales deben decidir conforme a los principios generales del derecho, tal y como lo dispone el artículo 42 de la Convención.

  10. Stability of a Bifunctional Cu-Based Core@Zeolite Shell Catalyst for Dimethyl Ether Synthesis Under Redox Conditions Studied by Environmental Transmission Electron Microscopy and In Situ X-Ray Ptychography

    DEFF Research Database (Denmark)

    Baier, Sina; Damsgaard, Christian Danvad; Klumpp, Michael

    2017-01-01

    gas. The catalyst stability was studied in a hierarchical manner by complementary environmental transmission electron microscopy (ETEM), scanning electron microscopy (SEM) and in situ hard X-ray ptychography with a specially designed in situ cell. Both reductive activation and reoxidation were applied....... The core-shell interface was found to be stable during reducing and oxidizing treatment at 250°C as observed by ETEM and in situ X-ray ptychography, although strong changes occurred in the core on a 10 nm scale due to the reduction of copper oxide to metallic copper particles. At 350°C, in situ X-ray...

  11. An Alternative Formation Theory of Beat. (II) Revelations of Recursion Formulas of the Reflected X-rays and the Anomalous Transmission and Absorption by the Binomial Theorem

    Science.gov (United States)

    Nakajima, Tetsuo

    2008-11-01

    The recursion formulas for the photon paths in the Borrmann triangle, which satisfy a new modified Pascal triangle can be derived from the binomial theorem by regarding the permutation of the stochastic variables of the diffracted and transmitted X-ray photons. The Borrmann triangle for the n-multiple X-ray reflections expanded by the n-degree binomial distribution consists of the two sub-triangles given by the ( n-1)-degree binomial distribution of the diffracted and transmitted photons. The former sub-triangle shows perfectly flawless symmetry but the latter one shows inevitable asymmetry. A reasonable understanding of both the high intense and very weak photon flows in the Borrmann triangle, which are popularly known as the anomalous transmission and absorption, respectively, are derived from the binomial theorem. Incident photons irradiated at a point O that forms the vertex of the Borrmann triangle propagate through the bypasses parallel to only the complementary half of the integral whole median with the high probabilities from the binomial theorem and emanate them from a short width slit of overline{O'O''} on the base of the high intense photon flow Borrmann triangle ▵ OO' O″, which can be defined by the standard deviation of the normal distribution. The parallel paths to the whole median also pass the very weak photon flows from the high power exponent of d multinomials through the triangle ▵ OO' O″. Both the above contrastive photon flows could coexist in ▵ OO' O″ based upon the complementary rivalry duality from the binomial theorem of ( d+ t) n =1, including the very weak photon flows from the high power exponent of t multinomials near both sides of the Borrmann triangle.

  12. Measurement Error in Atomic-Scale Scanning Transmission Electron Microscopy—Energy-Dispersive X-Ray Spectroscopy (STEM-EDS) Mapping of a Model Oxide Interface

    Energy Technology Data Exchange (ETDEWEB)

    Spurgeon, Steven R.; Du, Yingge; Chambers, Scott A.

    2017-04-05

    Abstract

    With the development of affordable aberration correctors, analytical scanning transmission electron microscopy (STEM) studies of complex interfaces can now be conducted at high spatial resolution at laboratories worldwide. Energy-dispersive X-ray spectroscopy (EDS) in particular has grown in popularity, as it enables elemental mapping over a wide range of ionization energies. However, the interpretation of atomically resolved data is greatly complicated by beam–sample interactions that are often overlooked by novice users. Here we describe the practical factors—namely, sample thickness and the choice of ionization edge—that affect the quantification of a model perovskite oxide interface. Our measurements of the same sample, in regions of different thickness, indicate that interface profiles can vary by as much as 2–5 unit cells, depending on the spectral feature. This finding is supported by multislice simulations, which reveal that on-axis maps of even perfectly abrupt interfaces exhibit significant delocalization. Quantification of thicker samples is further complicated by channeling to heavier sites across the interface, as well as an increased signal background. We show that extreme care must be taken to prepare samples to minimize channeling effects and argue that it may not be possible to extract atomically resolved information from many chemical maps.

  13. 3D membrane segmentation and quantification of intact thick cells using cryo soft X-ray transmission microscopy: A pilot study.

    Science.gov (United States)

    Cárdenes, Rubén; Zhang, Chong; Klementieva, Oxana; Werner, Stephan; Guttmann, Peter; Pratsch, Christoph; Cladera, Josep; Bijnens, Bart H

    2017-01-01

    Structural analysis of biological membranes is important for understanding cell and sub-cellular organelle function as well as their interaction with the surrounding environment. Imaging of whole cells in three dimension at high spatial resolution remains a significant challenge, particularly for thick cells. Cryo-transmission soft X-ray microscopy (cryo-TXM) has recently gained popularity to image, in 3D, intact thick cells (∼10μm) with details of sub-cellular architecture and organization in near-native state. This paper reports a new tool to segment and quantify structural changes of biological membranes in 3D from cryo-TXM images by tracking an initial 2D contour along the third axis of the microscope, through a multi-scale ridge detection followed by an active contours-based model, with a subsequent refinement along the other two axes. A quantitative metric that assesses the grayscale profiles perpendicular to the membrane surfaces is introduced and shown to be linearly related to the membrane thickness. Our methodology has been validated on synthetic phantoms using realistic microscope properties and structure dimensions, as well as on real cryo-TXM data. Results demonstrate the validity of our algorithms for cryo-TXM data analysis.

  14. Measurement Error in Atomic-Scale Scanning Transmission Electron Microscopy-Energy-Dispersive X-Ray Spectroscopy (STEM-EDS) Mapping of a Model Oxide Interface.

    Science.gov (United States)

    Spurgeon, Steven R; Du, Yingge; Chambers, Scott A

    2017-06-01

    With the development of affordable aberration correctors, analytical scanning transmission electron microscopy (STEM) studies of complex interfaces can now be conducted at high spatial resolution at laboratories worldwide. Energy-dispersive X-ray spectroscopy (EDS) in particular has grown in popularity, as it enables elemental mapping over a wide range of ionization energies. However, the interpretation of atomically resolved data is greatly complicated by beam-sample interactions that are often overlooked by novice users. Here we describe the practical factors-namely, sample thickness and the choice of ionization edge-that affect the quantification of a model perovskite oxide interface. Our measurements of the same sample, in regions of different thickness, indicate that interface profiles can vary by as much as 2-5 unit cells, depending on the spectral feature. This finding is supported by multislice simulations, which reveal that on-axis maps of even perfectly abrupt interfaces exhibit significant delocalization. Quantification of thicker samples is further complicated by channeling to heavier sites across the interface, as well as an increased signal background. We show that extreme care must be taken to prepare samples to minimize channeling effects and argue that it may not be possible to extract atomically resolved information from many chemical maps.

  15. A comparative study of PIXE and XRF corrected by Gamma-Ray Transmission for the non-destructive characterization of a gilded roman railing

    Energy Technology Data Exchange (ETDEWEB)

    Ortega-Feliu, I., E-mail: iofeliu@us.e [Centro Nacional de Aceleradores, Avd. Thomas A. Edison, 7, 41092 Sevilla (Spain); Moreno-Suarez, A.I. [Centro Nacional de Aceleradores, Avd. Thomas A. Edison, 7, 41092 Sevilla (Spain); Departamento de Fisica Aplicada I, Universidad de Sevilla (Spain); Gomez-Tubio, B. [Centro Nacional de Aceleradores, Avd. Thomas A. Edison, 7, 41092 Sevilla (Spain); Departamento de Fisica Aplicada III, Universidad de Sevilla (Spain); Ager, F.J. [Centro Nacional de Aceleradores, Avd. Thomas A. Edison, 7, 41092 Sevilla (Spain); Departamento de Fisica Aplicada I, Universidad de Sevilla (Spain); Respaldiza, M.A. [Centro Nacional de Aceleradores, Avd. Thomas A. Edison, 7, 41092 Sevilla (Spain); Departamento de Fisica Atomica, Molecular y Nuclear, Universidad de Sevilla (Spain); Garcia-Dils, S. [Departamento de Historia Antigua, Universidad de Sevilla (Spain); Rodriguez-Gutierrez, O. [Departamento de Prehistoria y Arqueologia, Universidad de Sevilla (Spain)

    2010-06-15

    Several fragments of a gilded railing were found in the archaeological excavations carried out in Ecija (Spain), among the remains of a collapsed temple. The alloy composition and the gilding procedure used for its manufacture are of interest for a complete archaeological knowledge of the artefact. The common use of IBA techniques directly on the objects for their analysis is not possible due to the thick corroded patinas that they exhibit due to the burial environment. However, non-destructive analyses of a few selected fragments have been done using PIXE and XRF techniques in combination with Gamma-Ray Transmission. Indeed, as was previously shown , bronze objects can be characterized in a completely non-destructive way using the combination of these techniques. This work, shows the applicability of that method to artefacts made of leaded copper alloy, which is the case of samples studied, for which some problems could arise from the lead segregations present in these kind of alloys. We have found that this railing contains low amounts of Sn and Sb, and that the gilding was most probably obtained using a gold leaf.

  16. Structure refinement of the δ1p phase in the Fe-Zn system by single-crystal X-ray diffraction combined with scanning transmission electron microscopy.

    Science.gov (United States)

    Okamoto, Norihiko L; Tanaka, Katsushi; Yasuhara, Akira; Inui, Haruyuki

    2014-04-01

    The structure of the δ1p phase in the iron-zinc system has been refined by single-crystal synchrotron X-ray diffraction combined with scanning transmission electron microscopy. The large hexagonal unit cell of the δ1p phase with the space group of P63/mmc comprises more or less regular (normal) Zn12 icosahedra, disordered Zn12 icosahedra, Zn16 icosioctahedra and dangling Zn atoms that do not constitute any polyhedra. The unit cell contains 52 Fe and 504 Zn atoms so that the compound is expressed with the chemical formula of Fe13Zn126. All Fe atoms exclusively occupy the centre of normal and disordered icosahedra. Iron-centred normal icosahedra are linked to one another by face- and vertex-sharing forming two types of basal slabs, which are bridged with each other by face-sharing with icosioctahedra, whereas disordered icosahedra with positional disorder at their vertex sites are isolated from other polyhedra. The bonding features in the δ1p phase are discussed in comparison with those in the Γ and ζ phases in the iron-zinc system.

  17. Transmission electron microscopic and X-ray absorption fine structure spectroscopic investigation of U repartition and speciation after accumulation in renal cells

    Energy Technology Data Exchange (ETDEWEB)

    Carriere, M.; Milgram, S.; Thiebault, C.; Avoscan, L.; Gouget, B. [CEA Saclay, Lab Pierre Sue, CEA-CNRS, F-91191 Gif sur Yvette, (France); Proux, O. [Univ Joseph Fourier, CNRS, Lab Geophys Interne et Tectonophys, F-38400 Saint Martin d' Heres, (France)

    2008-07-01

    After environmental contamination, U accumulates in the kidneys and in bones, where it causes visible damage. Recent in vitro data prove that the occurrence of citrate increases U bioavailability without changing its speciation. Two hypotheses can explain the role of citrate: it either modifies the U intracellular metabolization pathway, or it acts on the transport of U through cell membrane. To understand which mechanisms lead to increased bioavailability, we studied the speciation of U after accumulation in NRK-52E kidney cells. U speciation was first identified in various exposure media, containing citrate or not, in which U was supplied as U carbonate. The influence of serum proteins was analyzed in order to detect the formation of macromolecular complexes of U. Transmission electron microscopy (TEM) was employed to follow the evolution of the U species distribution among precipitated and soluble forms. Finally, extended X-ray absorption fine structure spectroscopy (EXAFS) enabled the precipitates observed to be identified as U-phosphate. It also demonstrated that the intracellular soluble form of U is U carbonate. These results suggest that citrate does not change U metabolization but rather plays a role in the intracellular accumulation pathway. U speciation inside cells was directly and clearly identified for the first time. These results elucidate the role of U speciation in terms of its bioavailability and consequent health effects. (authors)

  18. Validacion y medida de la responsabilidad social en la universidad

    National Research Council Canada - National Science Library

    Maldonado de Guevara, Carmen de la Calle; Garcia Ramos, Jose Manuel; Gimenez Armentia, Pilar; Ortega de la Fuente, Miguel

    2008-01-01

    La construccion de una escala de medida del grado de Responsabilidad Social del universitario y su validacion como instrumento de medicion del mismo son los objetivos principales de este estudio exploratorio...

  19. Medida de similitud basada en saliencia

    Directory of Open Access Journals (Sweden)

    Sergio Domínguez

    2012-10-01

    quantifying saliency of feature values, for combining them during a comparison process and, eventually, to weight that feature attending to the result of the combination, are introduced as well. The results for the evaluation of this similarity measure in an image based content retrieval task are presented, as well as their comparison with those obtained using euclidean distance in the same task. Both are validated by volunteers who labelled the retrieved sets. Palabras clave: Bases de datos de imágenes, recuperación basada en contenido, medidas de similitud, modelos perceptuales, análisis de imágenes, Keywords: Image databases, content based retrieval, similarity measures, perceptual models, image analysis

  20. High-energy transmission Laue micro-beam X-ray diffraction: a probe for intra-granular lattice orientation and elastic strain in thicker samples.

    Science.gov (United States)

    Hofmann, Felix; Song, Xu; Abbey, Brian; Jun, Tea-Sung; Korsunsky, Alexander M

    2012-05-01

    An understanding of the mechanical response of modern engineering alloys to complex loading conditions is essential for the design of load-bearing components in high-performance safety-critical aerospace applications. A detailed knowledge of how material behaviour is modified by fatigue and the ability to predict failure reliably are vital for enhanced component performance. Unlike macroscopic bulk properties (e.g. stiffness, yield stress, etc.) that depend on the average behaviour of many grains, material failure is governed by `weakest link'-type mechanisms. It is strongly dependent on the anisotropic single-crystal elastic-plastic behaviour, local morphology and microstructure, and grain-to-grain interactions. For the development and validation of models that capture these complex phenomena, the ability to probe deformation behaviour at the micro-scale is key. The diffraction of highly penetrating synchrotron X-rays is well suited to this purpose and micro-beam Laue diffraction is a particularly powerful tool that has emerged in recent years. Typically it uses photon energies of 5-25 keV, limiting penetration into the material, so that only thin samples or near-surface regions can be studied. In this paper the development of high-energy transmission Laue (HETL) micro-beam X-ray diffraction is described, extending the micro-beam Laue technique to significantly higher photon energies (50-150 keV). It allows the probing of thicker sample sections, with the potential for grain-level characterization of real engineering components. The new HETL technique is used to study the deformation behaviour of individual grains in a large-grained polycrystalline nickel sample during in situ tensile loading. Refinement of the Laue diffraction patterns yields lattice orientations and qualitative information about elastic strains. After deformation, bands of high lattice misorientation can be identified in the sample. Orientation spread within individual scattering volumes is

  1. Medidas de Bienestar: De lo General a lo Particular Medidas de Bienestar: De lo General a lo Particular

    Directory of Open Access Journals (Sweden)

    Oscar Javier Cárdenas Rodríguez

    2012-02-01

    Full Text Available En este artículo se analizan medidas de bienestar. Se inicia por el producto interno bruto como un indicador a nivel nacional y, al tiempo que éste se analiza, se explican algunas medidas alternativas a nivel agregado, como el PIB ecológico y el índice de desarrollo humano. Después se analizan algunas medidas de carácter microeconómico, como la distribución del ingreso, medidas de pobreza y marginación. Este análisis concluye indicando que la mejor medida de bienestar depende del objetivo específi co que se busque analizar, ya que ninguna medida puede dar respuesta a todas las preguntas relacionadas bienestar. This paper analyzes ways of measuring well-being. The study begins with the gross domestic product (GDP as a measurement of well-being at the national level. It also discusses alternative ways of measuring well-being at the level of aggregates, such as the ecological GDP and the index of human development (HDI. Moreover, some measurements of the microeconomic type, such as income distribution, poverty, and marginalization are analyzed. This research study states that the best indicator of welfare depends on a given specific objective. This is because none of the ways of measuring well-being is able to provide a definite answer to all the questions related to the welfare of a society.

  2. Effect of polymers on the nanostructure and on the carbonation of calcium silicate hydrates: a scanning transmission X-ray microscopy study

    KAUST Repository

    Ha, J.

    2011-09-07

    This study investigated the effects of organic polymers (polyethylene glycol and hexadecyltrimethylammonium) on structures of calcium silicate hydrates (C-S-H) which is the major product of Portland cement hydration. Increased surface areas and expansion of layers were observed for all organic polymer modified C-S-H. The results from attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopic measurements also suggest lowered water contents in the layered structures for the C-S-H samples that are modified by organic polymers. Scanning transmission X-ray microscopy (STXM) results further supports this observation. We also observed difference in the extent of C-S-H carbonation due to the presence of organic polymers. No calcite formed in the presence of HDTMA whereas formation of calcite was observed with C-S-H sample modified with PEG. We suggest that the difference in the carbonation reaction is possibly due to the ease of penetration and diffusion of the CO 2. This observation suggests that CO 2 reaction strongly depends on the presence of organic polymers and the types of organic polymers incorporated within the C-S-H structure. This is the first comprehensive study using STXM to quantitatively characterize the level of heterogeneity in cementitious materials at high spatial and spectral resolutions. The results from BET, XRD, ATR-FTIR, and STXM measurements are consistent and suggest that C-S-H layer structures are significantly modified due to the presence of organic polymers, and that the chemical composition and structural differences among the organic polymers determine the extent of the changes in the C-S-H nanostructures as well as the extent of carbonation reaction. © 2011 Springer Science+Business Media, LLC.

  3. Nuevas contribuciones sobre L¹ de una medida vectorial

    OpenAIRE

    Delgado Garrido, Olvido

    2004-01-01

    La esencia del Capítulo 1 se muestra con el sencillo hecho de que dada una medida positiva y finita µ y p (1, ), el espacio Lp(µ) está continuamente contenido en L1(µ) y se puede describir en términos de µ como el espacio de funciones f tales como fp es integrable respecto de µ. En el Capítulo 2, trabajamos con medidas vectoriales : R X definidas sobre un -anillo R y con valores en un espacio de Banach X. El Capítulo 3 (inspirado en [CR1]) se divide en dos secciones. En la primera se con...

  4. Instrumentos de medida romanos hallados en Andalucía

    Directory of Open Access Journals (Sweden)

    Francisca CHAVES TRISTÁN

    2009-10-01

    Full Text Available La aparición de instrumentos de medida de época romana no es excesivamente rara pero tampoco frecuente. Lo que resulta más difícil es encontrarlos con todos los elementos que lo componen de modo que se pueda realizar el estudio de las medidas para las que se utilizaban. En este breve artículo damos a conocer dos instrumentos que por fortuna conservan las partes suficientes para poder dilucidar las pesadas que se obtenían con ellos.

  5. Photoneutron cross sections measurements in {sup 9}Be, {sup 13}C e {sup 17}O with thermal neutron capture gamma-rays; Medidas das secoes de choque de fotoneutrons do {sup 9}Be, {sup 13}C e {sup 17}O com radiacao gama de captura de neutrons termicos

    Energy Technology Data Exchange (ETDEWEB)

    Semmler, Renato

    2006-07-01

    Photoneutron cross sections measurements of {sup 9}Be, {sup 13}C and {sup 17}O have been obtained in the energy interval between 1,6 and 10,8 MeV, using neutron capture gamma-rays with high resolution in energy (3 a 21 eV), produced by 21 target materials, placed inside a tangential beam port, near the core of the IPEN/CNEN-SP IEA-R1 (5 MW) research reactor. The samples have been irradiated inside a 4{pi} geometry neutron detector system 'Long Counter', 520,5 cm away from the capture target. The capture gamma-ray flux was determined by means of the analysis of the gamma spectrum obtained by using a Ge(Li) solid-state detector (EG and G ORTEC, 25 cm{sup 3}, 5%), previously calibrated with capture gamma-rays from a standard target of Nitrogen (Melamine). The neutron photoproduction cross section has been measured for each target capture gamma-ray spectrum (compound cross section). A inversion matrix methodology to solve inversion problems for unfolding the set of experimental compound cross sections, was used in order to obtain the cross sections at specific excitation energy values (principal gamma line energies of the capture targets). The cross sections obtained at the energy values of the principal gamma lines were compared with experimental data reported by other authors, with have employed different gamma-ray sources. A good agreement was observed among the experimental data in this work with reported in the literature. (author)

  6. The qualitative f-ratio method applied to electron channelling-induced x-ray imaging with an annular silicon drift detector in a scanning electron microscope in the transmission mode.

    Science.gov (United States)

    Brodusch, Nicolas; Gauvin, Raynald

    2017-09-01

    Electron channelling is known to affect the x-ray production when an accelerated electron beam is applied to a crystalline material and is highly dependent on the local crystal orientation. This effect, unless very long counting time are used, is barely noticeable on x-ray energy spectra recorded with conventional silicon drift detectors (SDD) located at a small elevation angle. However, the very high count rates provided by the new commercially available annular SDDs permit now to observe this effect routinely and may, in some circumstances, hide the true elemental x-ray variations due to the local true specimen composition. To circumvent this issue, the recently developed f-ratio method was applied to display qualitatively the true net intensity x-ray variations in a thin specimen of a Ti-6Al-4V alloy in a scanning electron microscope in transmission mode. The diffraction contrast observed in the x-ray images was successfully cancelled through the use of f-ratios and the true composition variations at the grain boundaries could be observed in relation to the dislocation alignment prior to the β-phase nucleation. The qualitative effectiveness in removing channelling effects demonstrated in this work makes the f-ratio, in its quantitative form, a possible alternative to the ZAF method in channelling conditions. © 2017 The Authors Journal of Microscopy © 2017 Royal Microscopical Society.

  7. A Freeze-Fracture Transmission Electron Microscopy and Small Angle X-Ray Diffraction Study of the Effects of Albumin, Serum, and Polymers on Clinical Lung Surfactant Microstructure

    OpenAIRE

    Braun, Andreas; Stenger, Patrick C.; Warriner, Heidi E.; Zasadzinski, Joseph A.; Lu, Karen W.; Taeusch, H. William

    2007-01-01

    Freeze-fracture transmission electron microscopy shows significant differences in the bilayer organization and fraction of water within the bilayer aggregates of clinical lung surfactants, which increases from Survanta to Curosurf to Infasurf. Albumin and serum inactivate all three clinical surfactants in vitro; addition of the nonionic polymers polyethylene glycol, dextran, or hyaluronic acid also reduces inactivation in all three. Freeze-fracture transmission electron microscopy shows that ...

  8. EPS composition and calcification potential of tufa-dominating cyanobacteria investigated by Scanning Transmission X-ray Microscopy (STXM) and Laser Scanning Microscopy (LSM)

    Science.gov (United States)

    Zippel, Barbara; Dynes, James J.; Obst, Martin; Lawrence, John R.; Neu, Thomas R.

    2010-05-01

    Tufa deposits in freshwater habitats are the result of calcium carbonate precipitation within interfacial microbial ecosystems. Calcite precipitation is influenced by the saturation index and the occurrence of extracellular polymeric substances (EPS) which are produced by a variety of microorganisms. In theory, the first important step of biologically induced calcification processes is the adsorption of calcium ions by extracellular polymeric substances (EPS) produced by cyanobacteria. In the present study we take advantage of Laser Scanning Microscopy (LSM) and combine it with Synchrotron imaging using Scanning Transmission X-ray Microscopy (STXM). STXM represents a technique that allows simultaneous analysis of inorganic and organic constituents as a scale of 50 nm. By means of STXM it is possible to differentiate between calcium carbonate phases at the Ca L-edge. Furthermore, STXM has also been used at the C K-edge to map the major biomolecules (proteins, lipids, and polysaccharides). The purpose of this study is to find out if there are differences in calcium adsorption depending on specific composition of the EPS produced by filamentous cyanobacteria isolated from a German hard water creek (Westerhöfer Bach, Harz Mountains). The goal was to elucidate the potential of biofilms constituents, including microbial cell surfaces as well as extracellular polymeric substances, in triggering the formation of calcium carbonate in tufa systems. For this purpose three filamentous cyanobacteria (Pseudanabaena sp., Leptolyngbya sp. and Nostoc sp.) were cultivated in creek-adapted as well as standard media (BG11) on polycarbonate slides. In situ EPS composition was detected by means of fluorescence lectin-binding approach (FLBA) using 23 commercially available lectins with different specificities for mono- and disaccharides and amino sugars. For CaCO3 nucleation experiments cyanobacterial biofilms grown on polycarbonate slides were deposited in NaHCO3/CaCl2 solutions

  9. Medidas de resistividad de terrenos e impedancias de puesta a tierra

    OpenAIRE

    Castellanos Domínguez, César Germán

    1993-01-01

    Este libro consta de ocho capítulos: Resistividad del suelo, Medida de impedancia de puesta a tierra, Aspectos prácticos de medidas, Características de los elementos de medición, Seguridad y precauciones en medidas, Potenciales y gradientes, Efectos fisiológicos de la corriente eléctrica e Intensidades de falla.

  10. Calibration of thickness-dependent k-factors for germanium X-ray lines to improve energy-dispersive X-ray spectroscopy of SiGe layers in analytical transmission electron microscopy

    OpenAIRE

    Qiu, Yi; Nguyen, Huy; A. Dobbie; Myronov, Maksym; Walther, T.

    2013-01-01

    We show that the accuracy of energy-dispersive X-ray spectroscopy can be improved by analysing and comparing multiple lines from the same element. For each line, an effective k-factor can be defined that varies as a function of the intensity ratio of multiple lines (e.g. K/L) from the same element. This basically performs an internal self-consistency check in the quantification using differently absorbed X-ray lines, which is in principle equivalent to an absorption correction as a function o...

  11. Characterization of a new transmission detector for patient individualized online plan verification and its influence on 6MV X-ray beam characteristics

    Energy Technology Data Exchange (ETDEWEB)

    Thoelking, Johannes; Sekar, Yuvaraj; Fleckenstein, Jens; Lohr, Frank; Wenz, Frederik; Wertz, Hansjoerg [Heidelberg Univ., University Medical Center Mannheim (Germany). Dept. of Radiation Oncology

    2016-11-01

    Online verification and 3D dose reconstruction on daily patient anatomy have the potential to improve treatment delivery, accuracy and safety. One possible implementation is to recalculate dose based on online fluence measurements with a transmission detector (TD) attached to the linac. This study provides a detailed analysis of the influence of a new TD on treatment beam characteristics. The influence of the new TD on surface dose was evaluated by measurements with an Advanced Markus Chamber (Adv-MC) in the build-up region. Based on Monte Carlo simulations, correction factors were determined to scale down the over-response of the Adv-MC close to the surface. To analyze the effects beyond d{sub max} percentage depth dose (PDD), lateral profiles and transmission measurements were performed. All measurements were carried out for various field sizes and different SSDs. Additionally, 5 IMRT-plans (head and neck, prostate, thorax) and 2 manually created test cases (3 x 3 cm{sup 2} fields with different dose levels, sweeping gap) were measured to investigate the influence of the TD on clinical treatment plans. To investigate the performance of the TD, dose linearity as well as dose rate dependency measurements were performed. With the TD inside the beam an increase in surface dose was observed depending on SSD and field size (maximum of +11%, SSD = 80 cm, field size = 30 x 30 cm{sup 2}). Beyond d{sub max} the influence of the TD on PDDs was below 1%. The measurements showed that the transmission factor depends slightly on the field size (0.893-0.921 for 5 x 5 cm{sup 2} to 30 x 30 cm{sup 2}). However, the evaluation of clinical IMRT-plans measured with and without the TD showed good agreement after using a single transmission factor (γ{sub (2%/2mm)} > 97%, δ{sub ±3%} >95%). Furthermore, the response of TD was found to be linear and dose rate independent (maximum difference <0.5% compared to reference measurements). When placed in the path of the beam, the TD introduced

  12. Stability of a Bifunctional Cu-Based Core@Zeolite Shell Catalyst for Dimethyl Ether Synthesis Under Redox Conditions Studied by Environmental Transmission Electron Microscopy and In Situ X-Ray Ptychography.

    Science.gov (United States)

    Baier, Sina; Damsgaard, Christian D; Klumpp, Michael; Reinhardt, Juliane; Sheppard, Thomas; Balogh, Zoltan; Kasama, Takeshi; Benzi, Federico; Wagner, Jakob B; Schwieger, Wilhelm; Schroer, Christian G; Grunwaldt, Jan-Dierk

    2017-06-01

    When using bifunctional core@shell catalysts, the stability of both the shell and core-shell interface is crucial for catalytic applications. In the present study, we elucidate the stability of a CuO/ZnO/Al2O3@ZSM-5 core@shell material, used for one-stage synthesis of dimethyl ether from synthesis gas. The catalyst stability was studied in a hierarchical manner by complementary environmental transmission electron microscopy (ETEM), scanning electron microscopy (SEM) and in situ hard X-ray ptychography with a specially designed in situ cell. Both reductive activation and reoxidation were applied. The core-shell interface was found to be stable during reducing and oxidizing treatment at 250°C as observed by ETEM and in situ X-ray ptychography, although strong changes occurred in the core on a 10 nm scale due to the reduction of copper oxide to metallic copper particles. At 350°C, in situ X-ray ptychography indicated the occurrence of structural changes also on the µm scale, i.e. the core material and parts of the shell undergo restructuring. Nevertheless, the crucial core-shell interface required for full bifunctionality appeared to remain stable. This study demonstrates the potential of these correlative in situ microscopy techniques for hierarchically designed catalysts.

  13. Medidas de viscosidad: viscosímetro. Ley de Stokes

    OpenAIRE

    Pérez Rodríguez, Jorge; Miret Marí, Juan José; Espinosa Tomás, Julián; Caballero Caballero, María Teresa

    2010-01-01

    Guión de la pŕactica de Física de primero del grado de Óptica y Optometría "Medidas de viscosidad: Viscosímetro. Ley de Stokes" Objetivos - Medir la viscosidad de un líquido problema con el viscosímetro. - Señalar la ventaja de la determinación de magnitudes relativas. - Medir la viscosidad de un líquido problema aplicando la ley de Stokes.

  14. Medida de aceleraciones con puentes líquidos

    OpenAIRE

    González Hernández, Miguel Angel

    2011-01-01

    Se desarrolla la teoría básica necesaria para la aplicación de los puentes líquidos a la medida de pequeñas aceleraciones que llevan la dirección de su eje. En primer lugar se desarrolla un método de disparo que reduce el problema, de condiciones de contorno, a uno algebraico que, ampliado con un método de continuación, permite calcular formas de equilibrio de puentes líquidos, tanto estables como inestables, a partir de los valores de los parámetros. Con los resultados obtenidos se calculan ...

  15. Plan de negocios de la empresa Random; pantalones a medida

    OpenAIRE

    Marsal Josa, Armando

    2017-01-01

    Este trabajo trata de la realización del Plan de Negocio de Random, idea de negocio que consiste en una startup que diseña y vende pantalones tipo vaquero y chino a medida, pudiendo el comprador elegir, de entre una serie de detalles de motivos navajos ofrecidos por la marca, la forma de personalizarlos. Tendrán un precio asequible, intermedio entre las grandes marcas (Zara...) y las marcas tradicionales (Levi’s...). Se pretende dar salida a un producto artesanal y de calidad, aprovechando un...

  16. Stardust Interstellar Preliminary Examination IV: Scanning Transmission X-Ray Microscopy Analyses of Impact Features in the Stardust Interstellar Dust Collector

    Science.gov (United States)

    Butterworth, Anna L.; Westphal, Andrew J.; Frank, David R.; Allen, Carlton C.; Bechtel, Hans A.; Sandford, Scott A.; Tsou, Peter; Zolensky, Michael E.

    2014-01-01

    We report the quantitative characterization by synchrotron soft X-ray spectroscopy of 31 potential impact features in the aerogel capture medium of the Stardust Interstellar Dust Collector. Samples were analyzed in aerogel by acquiring high spatial resolution maps and high energy-resolution spectra of major rock-forming elements Mg, Al, Si, Fe, and others. We developed diagnostic screening tests to reject spacecraft secondary ejecta and terrestrial contaminants from further consideration as interstellar dust candidates. The results support an extraterrestrial origin for three interstellar candidates: I1043,1,30 (Orion) is a 3 pg particle with Mg-spinel, forsterite, and an iron-bearing phase. I1047,1,34 (Hylabrook) is a 4 pg particle comprising an olivine core surrounded by low-density, amorphous Mg-silicate and amorphous Fe, Cr, and Mn phases. I1003,1,40 (Sorok) has the track morphology of a high-speed impact, but contains no detectable residue that is convincingly distinguishable from the background aerogel. Twenty-two samples with an anthropogenic origin were rejected, including four secondary ejecta from impacts on the Stardust spacecraft aft solar panels, nine ejecta from secondary impacts on the Stardust Sample Return Capsule, and nine contaminants lacking evidence of an impact. Other samples in the collection included I1029,1,6, which contained surviving solar system impactor material. Four samples remained ambiguous: I1006,2,18, I1044,2,32, and I1092,2,38 were too dense for analysis, and we did not detect an intact projectile in I1044,3,33. We detected no radiation effects from the synchrotron soft X-ray analyses; however, we recorded the effects of synchrotron hard X-ray radiation on I1043,1,30 and I1047,1,34.

  17. Measurement of the Al content in AlGaN epitaxial layers by combined energy-dispersive X-ray and electron energy-loss spectroscopy in a transmission electron microscope

    Energy Technology Data Exchange (ETDEWEB)

    Amari, Houari; Walther, Thomas [Department of Electronic and Electrical Engineering, University of Sheffield, Sir Frederick Mappin Building, Sheffield S1 3JD (United Kingdom); Kappers, Menno J.; Humphreys, Colin J. [Department of Materials Science and Metallurgy, Pembroke Street, University of Cambridge, Cambridge, CB2 3QZ (United Kingdom); Cheze, Caroline [Paul-Drude-Institut fuer Festkoerperelektronik, 10117 Berlin (Germany)

    2012-03-15

    The purpose of this study is to use the two main techniques in analytical transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDXS) and energy-loss spectroscopy (EELS), to investigate the elemental distribution in different aluminium gallium nitride epitaxial layers grown by different methods. It is shown that an accurate EDX quantification is obtained when beam broadening and fluorescence of stray X-rays by the corundum substrate, Ga contamination due to focused ion beam (FIB) sample preparation and thickness-dependent k -factors are taken into account (T. Walther, Proc. EMAG 2009, Sheffield, J. Phys. Conf. Ser. 241, 012016 (2010) [1]). The EDXS quantification results are then compared to EELS quantification results. Both, analysis of Al and Ga K-lines by EDXS and analysis of Al K-line and Ga L-line in EELS can yield the Al content with a standard error of {delta}x {approx} 0.01-0.02 (copyright 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  18. Homogenous indium distribution in InGaN/GaN laser active structure grown by LP-MOCVD on bulk GaN crystal revealed by transmission electron microscopy and x-ray diffraction.

    Science.gov (United States)

    Kret, S; Dłużewski, P; Szczepańska, A; Zak, M; Czernecki, R; Kryśko, M; Leszczyński, M; Maciejewski, G

    2007-11-21

    We present transmission electron microscopy (TEM) and x-ray quantitative studies of the indium distribution in In(x)Ga(1-x)N/GaN multiple quantum wells (MQWs) with x = 0.1 and 0.18. The quantum wells were grown by low-pressure metalorganic chemical vapour deposition (LP-MOCVD) on a bulk, dislocation-free, mono-crystalline GaN substrate. By using the quantitative TEM methodology the absolute indium concentration was determined from the 0002 lattice fringe images by the strain measurement coupled with finite element (FE) simulations of surface relaxation of the TEM sample. In the x-ray diffraction (XRD) investigation, a new simulation program was applied to monitor the indium content and lateral composition gradients. We found a very high quality of the multiple quantum wells with lateral indium fluctuations no higher than Δx(L) = 0.025. The individual wells have very similar indium concentration and widths over the whole multiple quantum well (MQW) stack. We also show that the formation of 'false clusters' is not a limiting factor in indium distribution measurements. We interpreted the 'false clusters' as small In-rich islands formed on a sample surface during electron-beam exposure.

  19. Medidas de frecuencia en epidemioloxía

    OpenAIRE

    Barros Dios, Juan Miguel

    2008-01-01

    A presente Unidade Didáctica vai dirixida aos alumnos do terceiro ano da Licenciatura de Medicina, da disciplina “Epidemioloxía xeral e Demografía sanitaria”. Con ela preténdese contribuír á aprendizaxe máis autónoma do alumnado, de xeito que lles sirva de guía dun dos temas do programa, quizais un dos máis importantes, que supón a introdución ás ferramentas de medida dos fenómenos epidemiolóxicos estudados en Epidemioloxía, Saúde Pública e nas Ciencias da Saúde en xeral: as vulgarmente chama...

  20. Transmission eigenvalues

    Science.gov (United States)

    Cakoni, Fioralba; Haddar, Houssem

    2013-10-01

    In inverse scattering theory, transmission eigenvalues can be seen as the extension of the notion of resonant frequencies for impenetrable objects to the case of penetrable dielectrics. The transmission eigenvalue problem is a relatively late arrival to the spectral theory of partial differential equations. Its first appearance was in 1986 in a paper by Kirsch who was investigating the denseness of far-field patterns for scattering solutions of the Helmholtz equation or, in more modern terminology, the injectivity of the far-field operator [1]. The paper of Kirsch was soon followed by a more systematic study by Colton and Monk in the context of developing the dual space method for solving the inverse scattering problem for acoustic waves in an inhomogeneous medium [2]. In this paper they showed that for a spherically stratified media transmission eigenvalues existed and formed a discrete set. Numerical examples were also given showing that in principle transmission eigenvalues could be determined from the far-field data. This first period of interest in transmission eigenvalues was concluded with papers by Colton et al in 1989 [3] and Rynne and Sleeman in 1991 [4] showing that for an inhomogeneous medium (not necessarily spherically stratified) transmission eigenvalues, if they existed, formed a discrete set. For the next seventeen years transmission eigenvalues were ignored. This was mainly due to the fact that, with the introduction of various sampling methods to determine the shape of an inhomogeneous medium from far-field data, transmission eigenvalues were something to be avoided and hence the fact that transmission eigenvalues formed at most a discrete set was deemed to be sufficient. In addition, questions related to the existence of transmission eigenvalues or the structure of associated eigenvectors were recognized as being particularly difficult due to the nonlinearity of the eigenvalue problem and the special structure of the associated transmission

  1. Medida de estilos de regulacion afectiva (MARS) ampliada en ira y tristeza

    National Research Council Canada - National Science Library

    Paez Rovira, Dario; Martinez Sanchez, Francisco; Sevillano Triguero, Veronica; Mendiburo Seguel, Andres; Campos, Miriam

    2012-01-01

    .... El estudio examino la asociacion entre formas de regulacion afectiva con la adaptacion en estos episodios y con medidas disposicionales de afrontamiento, de regulacion emocional y bienestar psicologico...

  2. MEDIDAS DE NÚCLEO INFLACIONARIO PARA COSTA RICA

    Directory of Open Access Journals (Sweden)

    Gabriela Saborío Muñoz

    2003-07-01

    Full Text Available En este documento se elaboran y evalúan medidas alternativas de núcleo inflacionario para Costa Rica. La idea fundamental contempla al núcleo inflacionario como un indicador de la tendencia subyacente de la inflación capaz de capturar el componente del cambio total de precios común a todos los bienes y servicios, cuya persistencia se mantendría en el mediano y largo plazo y que excluye los cambios en los precios relativos de estos. La medida de núcleo inflacionario seleccionada se contrasta con el Índice de Núcleo Inflacionario (INI, indicador de inflación subyacente actualmente utilizado por el Banco Central de Costa Rica (BCCR.El Índice Subyacente de Inflación (ISI, definido como una medida de núcleo inflacionario que excluye un 30,7% del peso total del Índice de Precios al Consumidor (IPC, refleja más fielmente la tendencia subyacente de la inflación y logra capturar el movimiento más permanente del nivel general de precios, aislando las variaciones en precios relativos. Además, el ISI es fácil de calcular e interpretar lo cual ayuda a incrementar la transparencia y credibilidad de la política monetaria. También es un indicador oportuno, aumentando su valor para los que formulan la política monetaria. Por último, el ISI supera algunas de las limitaciones del INI, como son la falta de un criterio estadístico para definir el punto de corte de los bienes y servicios a excluir y el alto porcentaje del peso total del IPC eliminado. AbstractThis paper builds and evaluates several alternative measures of core inflation for Costa Rica. The chosen measure of core inflation is contrasted with the core inflation index (INI, which is the indicator of underlying inflation used today by the Central Bank of Costa Rica (BCCR. The main idea is that core inflation is a good indicator of the underlying inflation and catches the part of overall price change common to all the goods and services that is expected to persist in the

  3. Data transmission

    National Research Council Canada - National Science Library

    Tugal, Dogan A; Tugal, Osman

    1989-01-01

    This updated second edition provides working answers to today's critical questions about designing and managing all types of data transmission systems and features a new chapter on local area networks (LANs...

  4. Medida do volume da úlcera cutânea na leishmaniosetegumentar

    Directory of Open Access Journals (Sweden)

    Dalmo Correia

    1996-12-01

    Full Text Available A medida dos diâmetros longitudinal e transverso de uma lesão ulcerada na leishmaniose tegumentar não reflete a profundidade, a qual também tem importância na avaliação da cura. A proposta deste estudo foi avaliar o volume da úlcera leishmaniõtica, através da moldagem seriada, antes e após o tratamento. A moldagem da cavidade, apôs assepsia local com água e sabão, foi feita com material plástico gelatinoso ã base de sílica, alginato de potássio, sulfato de cálcio e óxido de magnésio, comercializado sob o nome de jeltrate® (Dentsply Laboratory. Dissolveu-se 9,5g de jeltrate® em 20ml de água e aplicou-se o gel sobre a úlcera, o qual se solidificou em cinco minutos. Este molde foi então preenchido com acrílico autopolimerizante e o seu volume mensurado através do peso, usando-se balança analítica (Técnica 1 ou através do deslocamento da água, aplicando o princípio de Arquimedes (Técnica 2. Mostramos os dados de um estudo i-ealizado numa área de transmissão de Leishmania (Viannia braziliensis onde 20 pacientes foram tratados com três diferentes esquemas: sete pacientes receberam isotianato depentamidina, sete receberam sulfato de aminosidine e seis antimoniato de meglumina. Os resultados mostram em todos os pacientes redução uniforme do volume das úlceras melhor avaliada por qualquer uvta das duas técnicas utilizadas. Em relação aos esquemas terapêuticos houve diferença estatística significante entre os três esquemas usando o teste T de student, o qual mostrou que o sulfato de aminosidine produziu maior redução de volume que os outros compostos. Moldagens seriadas são registros permanentes e refletem melhor a cura clínica. Concluímos que a medida da lesão ulcerada é útil na avaliação terapêutica como procedimento prático, barato e que pode ser utilizado em estudos de campo.

  5. Medidas de democracia em surveys Survey meassures of democracy

    Directory of Open Access Journals (Sweden)

    Richard Rose

    2002-05-01

    Full Text Available Este artigo examina como as questões dos surveys sobre democracia são estruturadas de modos diferentes, dependendo do emprego de uma definição idealista ou realista e da presença ou não de comparações com regimes alternativos. Começo mostrando medidas de democracia em países pós-comunistas que perguntam às pessoas se estão satisfeitas ou não com a democracia e pedem que a comparem com um padrão ideal. As seções posteriores apresentam os resultados de questões realistas do New Democracies Barometer, que pedem às pessoas para avaliar regimes do passado, do presente e do futuro - e alternativas não-democráticas historicamente familiares.This paper examines how survey questions about democracy are framed in different ways, depending upon whether an idealist or realist definition is employed, and whether or not comparisons are made with alternative regimes. It starts by reporting measures of democracy in post-Communist countries that ask people whether they are satisfied with democracy and to compare it with an ideal standard. Subsequent sections set out the results of realist questions from the New Democracies Barometer, which ask people to evaluate regimes past, present and future-and historically familiar undemocratic regimes that people have known.

  6. Efecto de medidas preventivas contra la toxoplasmosis en embarazadas

    Directory of Open Access Journals (Sweden)

    María Mercedes Santacruz

    1992-06-01

    Full Text Available La incidencia de la infección por Toxoplasma gondii, fue estudiada en el laboratorio de Parasitología del Instituto Nacional de Salud en los sueros de 1000 mujeres embarazadas, seleccionadas entre las que asistieron al control prenatal en la Caja de Previsión, durante los años de 1987 a 1990. En los sueros se midieron anticuerpos específicos IgG contra el Toxoplasma gondii, por la técnica de Inmunofluorescencia Indirecta. El 59% de las mujeres fueron positivas con títulos entre 1:16 y 1:4.096, cifras que corresponden a las reveladas en el Estudio Nacional de Salud (ENS. El 41% de la población fue negativa. De estas negativas no se presentó ninguna seroconversión dando una incidencia de O en el grupo estudiado. Las embarazadas fueron instruidas sobre medidas preventivas para evitar la infección durante el embarazo, las cuales mostraron su eficacia, ya que ninguna de las negativas seroconvirtió durante el embarazo. Se recomienda, al lado de la vigilancia serológica, dar educación sobre la prevención de la infección.

  7. Futebol libertário: compromisso social na medida

    Directory of Open Access Journals (Sweden)

    Fábio Silvestre Silva

    Full Text Available Baseados na Constituição de 1988 e no Estatuto da Criança e do Adolescente, de 1990, o Centro de Defesa dos Direitos da Criança e do Adolescente de Interlagos (CEDECA Interlagos traz um relato de experiência de uma metodologia alternativa de acompanhamento de adolescentes inseridos em medidas socioeducativas em meio aberto na região da Capela do Socorro e Parelheiros. Essa proposta utiliza o futebol como meio que possibilita ao adolescente refletir sobre sua realidade e suas práticas cotidianas, reconhecendo suas possibilidades de se desenvolver como sujeito de direito e de se tornar protagonista no que diz respeito às ações que busquem sua promoção social e a construção e o exercício da cidadania ativa. É possível observar que, com esse tipo de linguagem, mais próximo do desejo desses jovens, os mesmos atribuem um novo sentido ao acompanhamento a que foram submetidos. Na lógica socioeducativa, procuram superar obstáculos no sentido de buscar cada vez mais seu protagonismo, sua autoria, para reafirmar o que o ato infracional revelou, que é a busca por ser sujeito.

  8. El prejuicio racial en Brasil: medidas comparativas O preconceito racial no Brasil: medidas comparativas Racial prejudice in Brazil: comparative measures

    Directory of Open Access Journals (Sweden)

    Ana Maria Lacerda Teixeira Pires

    2010-04-01

    Full Text Available El estudio trataba de medir las manifestaciones del prejuicio racial en una muestra de la población brasileña, utilizando las escalas de racismo moderno de McConahay, Hardee y Batts (1981 y la escala de racismo cordial de Turra y Venturi (1995 y Venturi (2003. Se aplicó los cuestionarios a un total de 101 estudiantes de diversas universidades en la región sur de Brasil. Los resultados muestran que las dos escalas difieren entre si respecto a captar las expresiones del prejuicio. Las personas declararon mayor racismo moderno que racismo cordial. También hemos estudiado las variables que influyen en el prejuicio racial declarado por los participantes. La variable género y orientación a la dominancia social son variables que predicen el racismo moderno en la muestra estudiada. Los participantes indicaron, en mayor medida, la manifestación del prejuicio racial de forma encubierta y lo hacen más abiertamente cuando hay la posibilidad del contacto personal y estrecho.O estudo avaliou as manifestações de preconceito racial em uma amostra da população brasileira, usando escalas de racismo moderno de McConahay, Hardee e Batts (1981, escala racismo cordial do Datafolha (1995 e Venturi, G. (2003. Os questionários foram aplicados a um total de 101 estudantes de várias universidades da região sul do Brasil. Os resultados mostram que as duas escalas diferem entre si sobre como capturar as expressões de preconceito. As pessoas relataram mais racismo moderno que racismo cordial. Estudamos também as variáveis que influenciam o preconceito racial declarado pelos participantes. As variáveis gênero e orientação à dominância social são preditores do racismo moderno na amostra estudada. Os participantes indicaram, em maior medida, a manifestação do preconceito racial dissimulado e o fazem mais abertamente quando existe a possibilidade do contato pessoal e estreito.This study measured the manifestations of racial prejudice in a sample of

  9. HIV Transmission

    Science.gov (United States)

    ... Abroad Treatment Basic Statistics Get Tested Find an HIV testing site near you. Enter ZIP code or city Follow HIV/AIDS CDC HIV CDC HIV/AIDS See RSS | ... on HIV Syndicated Content Website Feedback HIV/AIDS HIV Transmission Language: English (US) Español (Spanish) Recommend on ...

  10. Estudio sobre la medida de la velocidad de detonación

    OpenAIRE

    Linares Carrasco, Nadia Sira

    2013-01-01

    El presente proyecto trata de un análisis de las mediciones de la velocidad de detonación, obtenidas por diferentes métodos y dispositivos. Tiene como objetivo la inter-comparación de los resultados entre diferentes organismos para poder analizar las desviaciones e incertidumbres de las diferentes metodologías de medidas empleadas actualmente. Para ello, se realizaron medidas con dos tipos de explosivos por diferentes métodos y con dispositivos de medida distintos. A partir de esas mediciones...

  11. Transmission diamond imaging detector

    Energy Technology Data Exchange (ETDEWEB)

    Smedley, John, E-mail: smedley@bnl.gov; Pinelli, Don; Gaoweia, Mengjia [Brookhaven National Laboratory, Upton, NY (United States); Muller, Erik; Ding, Wenxiang; Zhou, Tianyi [Stony Brook University, Stony Brook, NY (United States); Bohon, Jen [Case Center for Synchrotron Biosciences, Center for Proteomics and Bioinformatics, Case Western Reserve University, Cleveland, OH (United States)

    2016-07-27

    Many modern synchrotron techniques are trending toward use of high flux beams and/or beams which require enhanced stability and precise understanding of beam position and intensity from the front end of the beamline all the way to the sample. For high flux beams, major challenges include heat load management in optics (including the vacuum windows) and a mechanism of real-time volumetric measurement of beam properties such as flux, position, and morphology. For beam stability in these environments, feedback from such measurements directly to control systems for optical elements or to sample positioning stages would be invaluable. To address these challenges, we are developing diamond-based instrumented vacuum windows with integrated volumetric x-ray intensity, beam profile and beam-position monitoring capabilities. A 50 µm thick single crystal diamond has been lithographically patterned to produce 60 µm pixels, creating a >1kilopixel free-standing transmission imaging detector. This device, coupled with a custom, FPGA-based readout, has been used to image both white and monochromatic x-ray beams and capture the last x-ray photons at the National Synchrotron Light Source (NSLS). This technology will form the basis for the instrumented end-station window of the x-ray footprinting beamline (XFP) at NSLS-II.

  12. Microstructural investigation of plastically deformed Ti{sub 20}Zr{sub 20}Hf{sub 20}Nb{sub 20}Ta{sub 20} high entropy alloy by X-ray diffraction and transmission electron microscopy

    Energy Technology Data Exchange (ETDEWEB)

    Dirras, G., E-mail: dirras@univ-paris13.fr [Université Paris 13, Sorbonne Paris Cité, LSPM (UPR 3407) CNRS, 99 avenue JB Clément, 93430 Villetaneuse (France); Gubicza, J.; Heczel, A. [Department of Materials Physics, Eötvös Loránd University, Budapest, P.O. Box 32, H-1518 (Hungary); Lilensten, L.; Couzinié, J.-P.; Perrière, L.; Guillot, I. [Université Paris Est, ICMPE (UMR 7182), CNRS, UPEC, 94320 Thiais (France); Hocini, A. [Université Paris 13, Sorbonne Paris Cité, LSPM (UPR 3407) CNRS, 99 avenue JB Clément, 93430 Villetaneuse (France)

    2015-10-15

    The microstructure evolution in body-centered cubic (bcc) Ti{sub 20}Zr{sub 20}Hf{sub 20}Nb{sub 20}Ta{sub 20} high entropy alloy during quasi-static compression test was studied by X-ray line profile analysis (XLPA) and transmission electron microscopy (TEM). The average lattice constant and other important parameters of the microstructure such as the mean crystallite size, the dislocation density and the edge/screw character of dislocations were determined by XLPA. The elastic anisotropy factor required for XLPA procedure was determined by nanoindentation. XLPA shows that the crystallite size decreased while the dislocation density increased with strain during compression, and their values reached about 39 nm and 15 × 10{sup 14} m{sup −2}, respectively, at a plastic strain of ~ 20%. It was revealed that with increasing strain the dislocation character became more screw. This can be explained by the reduced mobility of screw dislocations compared to edge dislocations in bcc structures. These observations are in line with TEM investigations. The development of dislocation density during compression was related to the yield strength evolution. - Highlights: • Ti{sub 20}Zr{sub 20}Hf{sub 20}Nb{sub 20}Ta{sub 20} high entropy alloy was processed by arc-melting. • The mechanical was evaluated by RT compression test. • The microstructure evolution was studied by XLPA and TEM. • With increasing strain the dislocation character became more screw. • The yield strength was related to the development of the dislocation density.

  13. Medidas procesales especiales y proteccíon de los derechos humanos Informe general

    National Research Council Canada - National Science Library

    Vervaele, J.A.E

    2009-01-01

    ... de transformación de los sistemas nacionales de justicia penal, en particular del proceso penal, en el que se han introducido medidas procesales especiales para hacer frente al terrorismo y al crimen organizado...

  14. MEDIDA SOCIOEDUCATIVA DE INTERNAÇÃO: ESTRATÉGIA PUNITIVA OU PROTETIVA?

    Directory of Open Access Journals (Sweden)

    Andrea Cristina Coelho Scisleski

    2015-12-01

    Full Text Available ResumoEste artigo problematiza como os jovens em conflito com a lei são administrados nas medidas socioeducativas de internação e busca a discussão das diferenças entre as formas de atender aqueles que recebem medidas de proteção e aqueles que recebem medidas socioeducativas. No que concerne à gestão, encontra-se uma separação na administração das medidas de proteção e das medidas socioeducativas em meio aberto, geridas pela Assistência Social, e as medidas socioeducativas de internação, geridas pela Segurança Pública. A pesquisa se desenvolveu pelo método cartográfico, que abrangeu entrevistas realizadas com profissionais do sistema socioeducativo, visitas às unidades de internação, leitura de processos jurídicos e oitivas de audiências na Vara da Infância e da Juventude. Conclui-se que a proteção integral preconizada pelo ECA não atinge todos, como é o caso dos adolescentes em conflito com a lei que estão internados, tendo seus direitos violados em prol da manutenção da segurança da população.

  15. Transmission ultrasonography. [time delay spectrometry for soft tissue transmission imaging

    Science.gov (United States)

    Heyser, R. C.; Le Croissette, D. H.

    1973-01-01

    Review of the results of the application of an advanced signal-processing technique, called time delay spectrometry, in obtaining soft tissue transmission images by transmission ultrasonography, both in vivo and in vitro. The presented results include amplitude ultrasound pictures and phase ultrasound pictures obtained by this technique. While amplitude ultrasonographs of tissue are closely analogous to X-ray pictures in that differential absorption is imaged, phase ultrasonographs represent an entirely new source of information based on differential time of propagation. Thus, a new source of information is made available for detailed analysis.

  16. Medidas automatizadas de psicrômetro de termopar aspirado versus não aspirado

    Directory of Open Access Journals (Sweden)

    Antonio Ribeiro da Cunha

    2014-06-01

    Full Text Available O termopar ou par termoelétrico é utilizado na obtenção da temperatura do ar com ótima precisão, sensibilidade e com grande vantagem sobre o termômetro de mercúrio ou álcool, pois geram sinais elétricos que podem ser armazenados em sistemas automatizados. No entanto, quando se trata da obtenção da umidade relativa a partir de termopar, o processo se torna mais cauteloso devido a outros fatores envolvidos. Neste estudo, avaliaram-se dois conjuntos psicrômetros de termopar, aspirado e não aspirado, em relação a um conjunto Vaisala, no período de 17 a 31/01/2008 (15 dias. A partir de medidas de temperaturas de bulbos seco e úmido foram obtidas medidas da umidade relativa, e com isso, foi possível compará-las com as medidas obtidas pelo conjunto Vaisala. Os dois tipos de psicrômetros apresentaram precisão e exatidão nas medidas de temperatura do ar, e apenas precisão nas medidas de umidade relativa do ar, sendo que o psicrômetro aspirado foi o mais preciso. Apesar do psicrômetro não aspirado ter apresentado menor precisão nas medidas, ele é mais robusto porque independe do micro-ventilador de 12 VDC, o que faz dele um sensor com menos riscos de medidas inadequadas. Ambos os psicrômetros, aspirado e não aspirado, não medem com exatidão a umidade relativa do ar no período noturno.

  17. Transcending Transmission

    DEFF Research Database (Denmark)

    Schoeneborn, Dennis; Trittin, Hannah

    2013-01-01

    Purpose – Extant research on corporate social responsibility (CSR) communication primarily relies on a transmission model of communication that treats organizations and communication as distinct phenomena. This approach has been criticized for neglecting the formative role of communication...... in the emergence of organizations. This paper seeks to propose to reconceptualize CSR communication by drawing on the “communication constitutes organizations” (CCO) perspective. Design/methodology/approach – This is a conceptual paper that explores the implications of switching from an instrumental...... to a constitutive notion of communication. Findings – The study brings forth four main findings: from the CCO view, organizations are constituted by several, partly dissonant, and potentially contradictory communicative practices. From that viewpoint, the potential impact of CSR communication becomes a matter...

  18. desarrollo y validación de un instrumento de medida

    Directory of Open Access Journals (Sweden)

    Arménio Rego

    2005-01-01

    Full Text Available El artículo describe cómo un instrumento de medida de la Inteligencia Emocional fue construido y validado. Cuatro etapas fueron seguidas: 1 Fueron escritos 96 ítems con base en la literatura y en trabajo propio de los autores; 2 Fue elaborado un cuestionario y aplicado a una muestra de 339 individuos; 3 Se procedió a un análisis factorial de las componentes principales; 4 Se relacionaron los factores emergentes con una medida de satisfacción con la vida. Los resultados sugirieron una solución factorial de seis componentes. Las consistencias internas de las escalas son invariablemente superiores a 0.70. Las seis dimensiones explican el 29% de la varianza de la medida de satisfacción con la vida

  19. Medidas de permitividad basadas en tecnología de microcinta *

    OpenAIRE

    Pulido-Mancera, Laura M.; González, Juan C.; Ávila, Alba; Baena, Juan D.

    2013-01-01

    El anillo resonador cortado complementario (CSRR) se utilizó en conjunto con una l__nea de microcinta para crear un dispositivo capaz de medir la permitividad de líquidos. La simulación y medida de los parámetros de dispersión fueron obtenidos para correlacionar la frecuencia de resonancia calibrar el dispositivo. Una vez calibrado, fue possible obtener un valor estimado de la permitividad de una solución con nanopartículas de plata. Estas medidas son interesantes dadas las limitadas técnicas...

  20. LAS MEDIDAS PREVENTIVAS AMBIENTALES, UNA APROXIMACIÓN DESDE EL DERECHO ADMINISTRATIVO.

    Directory of Open Access Journals (Sweden)

    Iván Andrés Páez Páez

    2013-05-01

    Full Text Available Las medidas preventivas previstas en el régimen sancionatorio ambiental sonuna especie de las medidas cautelares consagradas en el ordenamiento jurídicocolombiano, aunque con algunas particularidades propias de su ámbito deaplicación, que es el derecho ambiental. El artículo realiza una aproximaciónrespecto al contenido, alcance, antecedentes y justificación de las medidaspreventivas ambientales desde la óptica del derecho administrativo y comomanifestación de una de las funciones del ejecutivo, cual es el mantenimientodel orden público.

  1. Nodo sensor para la medida ambiental de CO2, temperatura y humedad

    OpenAIRE

    Jara Burgos, Marcos

    2007-01-01

    En este documento se describe el diseño y la implementación de un nodo sen-sor para la medida ambiental del nivel de CO2, la temperatura y la humedad relativa. El sistema se basa en un interfaz directo sensor a microcontrolador para las medidas de temperatura y humedad relativa, mientras que para el sensor de CO2 se basa en una conversión analógica digital. El sistema utiliza un sensor resistivo para medir la temperatura, un sensor capacitivo para medir la humedad relativa y un sensor...

  2. Medidas de bioseguridad adoptadas en el manejo con materiales biológicos en Laboratorios Liorad

    OpenAIRE

    Nancy Burguet Lago; Lázaro C Brito Godoy

    2013-01-01

    Introducción: el trabajo con microorganismos puede conllevar a riesgos tanto para el personal que trabaja con los mismos como para el medio ambiente. La existencia de laboratorios de seguridad biológica y la implementación de medidas en la manipulación de los agentes biológicos minimizan el riesgo. Objetivo: evaluar las medidas de bioseguridad adoptadas en el manejo con materiales biológicos en Laboratorios Liorad. Métodos: empleo de una lista de chequeo y análisis de los resultados a través ...

  3. Consecuencias de las medidas no arancelarias impuestas a Colombia por Ecuador y Argentina

    OpenAIRE

    Perez Giraldo, Johanna Sembelly; Vargas, William

    2016-01-01

    Con la apertura económica y comercial ha aumentado la negociación de acuerdos comerciales por medio de los cuales los países han logrado tener acceso preferencial libre de aranceles aduaneros. Esta dinámica ha incrementado el uso de medidas no arancelaria como instrumentos para controlar y restringir el acceso a los mercados de los países. Por lo expuesto, esta investigación presenta y analiza las medidas no arancelarias que fueron aplicadas a Colombia por Ecuador y Argentina desde el año 201...

  4. Medidas agroambientales y conservación de la biodiversidad: Limitaciones y perspectivas de futuro

    OpenAIRE

    E.D. Concepción; Díaz, M.

    2013-01-01

    Las medidas agroambientales se consideran la principal herramienta disponible para frenar la pérdida de biodiversidad asociada a la intensificación de la agricultura. Sin embargo la cuestión sobre si constituyen o no una herramienta adecuada para cumplir este objetivo continúa siendo objeto de debate científico. Las evaluaciones realizadas hasta el momento ofrecen resultados muy variables al respecto. En general, las medidas resultan efectivas cuando su objetivo es la conservación de especies...

  5. Medidas cautelares, anticipatorias y de urgencia en el proceso de amparo

    OpenAIRE

    Berizonce, Roberto Omar

    2010-01-01

    A partir de la evolución operada desde las clásicas medidas cautelares hacia las denominadas genéricamente tutelas anticipatorias, satisfactivas y de urgencia, en la jurisprudencia y en consonancia con la legislación comparada, se analiza la intensidad del fenómeno que ha conducido a la proliferación de las cautelares materiales y, en ciertos supuestos, al desplazamiento y hasta la sustitución del proceso de amparo. Se propugna, finalmente, una apropiada articulación de tales medidas con el a...

  6. Adolescência e medida socioeducativa de liberdade assistida : uma perspectiva psicanalítica

    OpenAIRE

    Miranda, Tiago Alves

    2013-01-01

    A dissertação tem o objetivo geral de discutir o ato infracional por uma perspectiva psicanalítica. Num trabalho eminentemente teórico, inserimos a psicanálise como uma das teorias possíveis para abordar as medidas socioeducativas e propor avanços. Com a discussão sobre os atos infracionais ainda é possível corroborar algumas ideias a respeito das medidas socioeducativas e, mais particularmente, acerca da liberdade assistida, a que acreditamos ser mais efetiva. São abordados os se...

  7. Dose and induction to cancer risk evaluation associated to use of X ray body scanners by transmission at airports; Avaliacao da dose e do risco de inducao ao cancer associados ao uso de escaneres corporais de raios X por transmissao em aeroportos

    Energy Technology Data Exchange (ETDEWEB)

    Correa, Samanda Cristine Arruda; Aquino, Josilto Oliveira de, E-mail: scorrea@cnen.gov.b, E-mail: josilto@cnen.gov.b [Comissao Nacional de Energia Nuclear (DIAPI/CGMI/CNEN), Rio de Janeiro, RJ (Brazil). Coordenacao Geral de Instalacoes Medicas e Industriais. Div. de Aplicacoes Industriais; Souza, Edmilson Monteiro de, E-mail: emonteiro@nuclear.ufrj.b [Centro Universitario Estadual da Zona Oeste (CAPI/UEZO), Campo Grande, RJ (Brazil). Colegiado da Area de Producao Industrial; Silva, Ademir Xavier da, E-mail: ademir@nuclear.ufrj.b [Coordenacao dos Programas de Pos-Graduacao de Engenharia (PEN/COPPE/UFRJ), RJ (Brazil). Programa de Engenharia Nuclear

    2011-07-01

    This paper uses the Monte Carlo MCNPX and the phantoms in male voxel and female voxel to evaluate the absorbed doses effective doses and the induction risk and the mortality due to cancer associated to exposures of individual submitted to X ray body scanners by transmission at various projections. The values of effective dose were calculated according to the recommended by the new ICRP 103 and the values of induction risks and mortality due to cancer were estimated through the document BEIR VII. (author)

  8. Medida de la presión arterial en el diabético.

    OpenAIRE

    Vinyoles, Ernest

    2016-01-01

    Las características generales de la medida de la presión arterial (PA) en el paciente diabético no difieren de las condiciones estandarizadas del resto de pacientes hipertensos en la consulta. Sin embargo, la diabetes se asocia a condicionantes que requieren una evaluación distinta en determinados casos.

  9. Medidas de biossegurança em audiologia Biosafety precautions in audiology

    Directory of Open Access Journals (Sweden)

    Patrícia Cotta Mancini

    2008-12-01

    Full Text Available TEMA: Biossegurança na atuação audiológica. OBJETIVO: rever as medidas de precaução-padrão na literatura para o controle de infecção na audiologia. As medidas de biossegurança sugeridas para diversos profissionais de saúde foram adaptadas para as atividades inerentes à prática audiológica no Serviço de Audiologia do Hospital das Clínicas da UFMG. CONCLUSÃO: as medidas de precaução-padrão apresentadas podem ser consideradas e viabilizadas nas diversas instituições, hospitais ou clínicas, nas quais a atuação fonoaudiológica é cada vez mais presente e, por conseguinte, impele medidas de precauções específicas à natureza dos exames audiológicos.BACKGROUND: biosafety precautions for audiologic practice. PURPOSE: to review the biosafety precautions suggested in the literature for infection control in audiology. The biosafety precautions suggested for many health professionals were adapted for the inherent activities of audiologic practice in Audiology Service at Hospital das Clínicas of UFMG. CONCLUSION: the submitted biosafety precautions can be used by any institution, hospital or clinic where the audiologic performance is becoming more widespread and, consequently, demanding specific precautions for audiologic practice.

  10. Adolescente em conflito com a lei e medidas socioeducativas: limites e (impossibilidades

    Directory of Open Access Journals (Sweden)

    Francischini, Rosângela

    2005-01-01

    Full Text Available Reinserção social, readaptação, ajustamento social, integração à família e sociedade. Várias são as expressões empregadas para referir-se ao efeito desejado do trabalho com o jovem em conflito com a lei, em cumprimento de medidas socioeducativas, particularmente em privação de liberdade. Parte do aparato legal do Estado, a partir da promulgação do Estatuto da Criança e do Adolescente, significaram, essas medidas, uma chamada à responsabilização do jovens, em face da transgressão cometida. No entanto, avalia-se, o que dá a essas medidas o caráter socioeducativo, fazendo com que o trabalho desenvolvido nas instituições diferencie-se do cumprimento de pena? Estrutura física, formação de recursos humanos, ações educativas e trabalho transdiciplinar são alguns dos aspectos implicados nesta questão. Neste contexto de discussão insere-se o presente artigo, que tem por objetivo discutir o caráter socioeducativo das medidas de privação de liberdade e as possibilidades de reinserção social do jovem em conflito com a lei

  11. Medidas procesales especiales y proteccíon de los derechos humanos Informe general

    NARCIS (Netherlands)

    Vervaele, J.A.E.

    2009-01-01

    El objetivo del informe general es realizar un análisis comparativo de los informes nacionales para evidenciar los procesos de transformación de los sistemas nacionales de justicia penal, en particular del proceso penal, en el que se han introducido medidas procesales especiales para hacer frente al

  12. MEDIDAS DE DESEMPENHO E ONTOLOGIAS: UM ESTUDO BIBLIOMÉTRICO PARA IDENTIFICAÇÃO DO USO DE ONTOLOGIAS PARA O SUPORTE DOS PROCESSOS DE MEDIDAS DE DESEMPENHO

    Directory of Open Access Journals (Sweden)

    Vanderlei Freitas Junior

    2015-09-01

    Full Text Available O presente trabalho se propõe analisar as publicações internacionais acerca do emprego das ontologias no contexto de medidas de desempenho. Para isso, foi realizada uma pesquisa bibliométrica em três bases de dados internacionais: Web of Science, Scopus e IEEE. Essa pesquisa foi desenvolvida em duas grandes etapas: (i busca sistemática da literatura, e (ii análise e síntese das informações bibliométricas. Foram localizados 115 trabalhos, escritos por 362 autores vinculados a 84 instituições de 101 países diferentes e estão publicados em 38 periódicos. Os autores identificaram ainda 981 palavras-chave diferentes em seus estudos. Os estudos, de maneira geral, evidenciam a possibilidade de utilização das ontologias como ferramenta semântica em diversas etapas e momentos do processo de medidas de desempenho, especialmente no que tange à representação do conhecimento e elu-cidação dos indicadores chaves, permitindo a interoperabilidade destes indicadores. A partir da identificação destes estudos o presente trabalho contribui para a compreensão das possibilidades de aplicação das ontologias para o suporte aos pro-cessos de medida de desempenho, realizando o mapeamento das publicações inter-nacionais desta temática e evidenciando a possibilidade de representação do conhecimento envolvido nesta tarefa.

  13. Survey of Transmission Cost Allocation Methodologies for Regional Transmission Organizations

    Energy Technology Data Exchange (ETDEWEB)

    Fink, S.; Porter, K.; Mudd, C.; Rogers, J.

    2011-02-01

    The report presents transmission cost allocation methodologies for reliability transmission projects, generation interconnection, and economic transmission projects for all Regional Transmission Organizations.

  14. Medidas de experiencia e cienciometria para avaliar impacto da producao cientifica

    Directory of Open Access Journals (Sweden)

    Marco Akerman

    2013-08-01

    Full Text Available Propõe-se a “experienciometria” como medida da experiência acadêmica de pesquisadores de modo a complementar a medida consagrada da cienciometria nas avaliações de competências em pesquisa. O artigo baseia-se em parte na produção cientifica do autor, utilizada sob uma perspectiva qualitativa para explorar possibilidades de análise de impactos. Ensaia-se uma síntese com possíveis implicações dessa análise, indicando algumas possibilidades para se avaliar impacto de pesquisas e artigos que não se restrinjam exclusivamente à contagem de números de citações dos autores para o cálculo do fator de impacto.

  15. La sociedad wayuu ante las medidas del estado venezolano (1840-1850

    Directory of Open Access Journals (Sweden)

    Carmen Laura Paz Reverol

    2000-01-01

    Full Text Available Las relaciones establecidas entre los Wayuu y los habitantes de Sinamaica, requirieron regu- larse por medio de ciertas medidas de control por parte del Estado venezolano a objeto de equilibrar los vínculos de poder entre las “parcialidades” indígenas y el Gobierno de la Provincia. Estas medidas dirigidas a la “Reducción y Civilización” de la sociedad, originaron respuestas violentas de la socie- dad Wayuu, quienes mediante las “incursiones” y “tropelías” defendieron su territorio y recursos na- turales. Esto reveló la lucha por conservar su autonomía, organización social y leyes ancestrales.

  16. Crisis y medidas anticrisis: una óptica de género

    Directory of Open Access Journals (Sweden)

    Teresa Pérez del Río

    2011-10-01

    Full Text Available Este artículo analiza como las conocidas como “medidas anticrisis” se muestran como un instrumento contra el Estado de bienestar y como tienen una especial incidencia en los principios e instrumentos de igualdad. De esta forma, la crisis se ha traducido en un agravamiento de la situación de discriminación por género en nuestra sociedad.Palabras clave: Crisis, medidas, anticrisis, igualdad. ________________AbstractThis article analyzes how the called “anti-crisis measures” are traslated in a instrument against the social welfare state and how it has a special signification in the principles and instruments of equality. So, the crisis was traslated in a aggravation of the discrimination situation for sex in our society.Keywords: crisis, anti-crisis measures, equality

  17. Medidas de bioseguridad adoptadas en el manejo con materiales biológicos en Laboratorios Liorad

    Directory of Open Access Journals (Sweden)

    Nancy Burguet Lago

    2013-03-01

    Full Text Available Introducción: el trabajo con microorganismos puede conllevar a riesgos tanto para el personal que trabaja con los mismos como para el medio ambiente. La existencia de laboratorios de seguridad biológica y la implementación de medidas en la manipulación de los agentes biológicos minimizan el riesgo. Objetivo: evaluar las medidas de bioseguridad adoptadas en el manejo con materiales biológicos en Laboratorios Liorad. Métodos: empleo de una lista de chequeo y análisis de los resultados a través de una Matriz DAFO para valorar si el diseño de la instalación cumple con la bioseguridad. Además establecer un sistema documental para la manipulación de microorganismos y la confección de un plan de capacitación para el personal que trabaja en el laboratorio de control microbiológico. Resultados: la lista de chequeo permitió identificar como principal debilidad el no disponer de un doble pasillo para el traslado del material limpio y sucio. Como fortalezas, cumplir con las prácticas y procesamientos adecuados y el contar con equipos de seguridad biológica. El sistema documental incorporó a los procedimientos establecidos para la manipulación, un acápite referido a la «Peligrosidad y Medidas de Seguridad». El programa de capacitación desarrollado permitió proveer conocimientos específicos referidos a esta temática. Conclusión: las medidas adoptadas en el laboratorio permiten plantear que de manera general se cumplen los requisitos establecidos en materia de Bioseguridad para el trabajo con microorganismos.

  18. Medidas de aislamiento en enfermedades transmisibles dentro del ámbito hospitalario

    OpenAIRE

    Villanueva Rábano, Raúl

    2016-01-01

    En el ámbito hospitalario, son un problema frecuente las infecciones nosocomiales, causadas por las enfermedades transmisibles que pasan de unos pacientes a otros. Estas infecciones son potencialmente prevenibles, a través de medidas de aislamiento llevadas a cabo por el personal sanitario y no sanitario encargado de atender al paciente. En este aspecto, el papel del personal de enfermería es de fundamental importancia dado que mantienen un estrecho contacto con el paciente como cuidadores pr...

  19. Medidas Explícitas e Implícitas de las Actitudes Hacia las Mujeres

    Directory of Open Access Journals (Sweden)

    Manuel Cárdenas

    2009-01-01

    Full Text Available El presente estudio tiene como objeto utilizar el IAT (Implicit Association Test para medir actitudes hacia las mujeres, de modo de comparar dichas evaluaciones de carácter automático con las obtenidas por medio de una medida explícita. Además, los participantes respondieron a un inventario de roles sexuales de modo de ver si los sujetos manejaban el estereotipo dominante asociado a lo femenino y sus efectos sobre el prejuicio. La muestra quedó conformada por 80 estudiantes universitarios. No se detectaron diferencias significativas entre hombres y mujeres en los estereotipos asociados a la mujer, ni en la evaluación que se hace de estas (medida explícita. En la medida de IAT las diferencias entre sexos aparecen, indicando que los hombres muestran una actitud implícita más negativa hacia las mujeres. De este modo se confirma que la aparente disminución del prejuicio que puede constatarse en los cuestionarios podría encubrir el hecho de que las actitudes negativas se mantienen a nivel implícito.

  20. Violência Juvenil e Medidas Socioeducativas: Revisão de Literatura

    Directory of Open Access Journals (Sweden)

    Jacqueline de Oliveira Moreira

    2017-10-01

    Full Text Available RESUMO Neste artigo, partindo do objetivo de compreender a relação entre violência juvenil e a resposta do Estado através das medidas socioeducativas, buscamos explicitar o pano de fundo das pesquisas científicas atuais. Realizamos uma meta-análise dos artigos publicados sobre adolescência e medidas socioeducativas, no campo da psicologia, entre os anos de 2000 e 2012. Concluímos que essa produção nacional pode ser reunida em três grandes categorias: (a prático-experiencial, que apresenta relatos analíticos da prática na aplicação das medidas socioeducativas, privilegiando a experiência concreta; (b político-institucional, que discute criticamente a dimensão política da lógica socioeducativa, detendo-se na análise estrutural de sua legislação e de suas instituições; (c sociocultural, que analisa os determinantes sociais e psíquicos do fenômeno da violência juvenil.

  1. Medidas cautelares innominadas en la protección de los derechos de autor y conexos en Colombia

    Directory of Open Access Journals (Sweden)

    Nixon Jefrey Gil Aguirre

    2016-12-01

    Full Text Available Actualmente, el ejercicio de funciones jurisdiccionales atribuidas a las autoridades administrativas ha generado interpretaciones judiciales confusas, en la aplicación de medidas cautelares innominadas para la protección de derechos de autor y conexos en Colombia; así lo evidencia el análisis realizado a las medidas cautelares descritas en la Ley 1493 del año 2011, que otorgó competencias de inspección, vigilancia y control sobre las sociedades de gestión colectiva de derechos de autor y conexos; en este sentido se requiere describir las funciones jurisdiccionales de la Dirección Nacional de Derecho de Autor respecto a las medidas cautelares y su importancia en la protección de los derechos de autor y conexos, al igual que analizar las medidas cautelares innominadas desde su origen, las características y lo propuesto por la Corte Constitucional en materia de funciones jurisdiccionales de la Dirección Nacional de Derecho de Autor y respecto de la procedencia de las medidas cautelares innominadas como competencia de esta entidad. Se concluye que las medidas cautelares nominadas no son suficientes, y que se hace necesario acudir a las medidas cautelares innominadas, como herramienta jurídica del funcionario administrativo, sin que ello implique arbitrariedad y prejuzgamiento en el proceso.

  2. Neutron Transmission through Sapphire Crystals

    DEFF Research Database (Denmark)

    Sapphire crystals are excellent filters of fast neutrons, while at the same time exhibit moderate to very little absorption at smaller energies. We have performed an extensive series of measurements in order to quantify the above effect. Alongside our experiments, we have performed a series...... of simulations, in order to reproduce the transmission of cold neutrons through sapphire crystals. Those simulations were part of the effort of validating and improving the newly developed interface between the Monte-Carlo neutron transport code MCNP and the Monte Carlo ray-tracing code McStas....

  3. Desenvolvimento em um biogradiômetro multicanal supercondutor com SQUIDs DC para registro de medidas de magnetocardiografia fetal

    OpenAIRE

    Matheus Sacilotto de Moura

    2011-01-01

    Neste projeto trabalhou-se no desenvolvimento de uma nova instrumentação para registrar medidas de campos magnéticos de origem biológica baseados em sensores SQUID e sistemas auxiliares, com o objetivo de usar este arranjo na aquisição de medidas de magnetocardiografia fetal (MCGf), que consiste no registro dos campos magnéticos gerados pela atividade cardíaca fetal, refletindo seus processos eletrofisiológicos. Esta técnica biomagnética além de ser bastante precisa para obter medidas de camp...

  4. Evaluación de riesgos y medidas preventivas de un taller de electrónica y potencia

    OpenAIRE

    Sánchez-Valero, Eva María

    2012-01-01

    La finalidad de la evaluación de riesgos es detectar los peligros y establecer acciones para eliminarlos, reducirlos y controlarlos, adaptar el trabajo a la persona, combatir los riesgos en su origen, formar e informar a los trabajadores, sustituir lo peligroso por lo que no lo sea o lo sea en menor medida, adoptar medidas de protección colectiva e individual…De esta evaluación surgirá la necesidad de adoptar medidas preventivas para eliminar o reducir los riesgos existentes y tener un contro...

  5. Medidas no financieras del rendimiento en la empresa: Fundamentos, métodos y una aplicación

    OpenAIRE

    Yacuzzi, Enrique

    2006-01-01

    Describimos y fundamentamos la tendencia creciente a utilizar medidas no financieras para la medición del rendimiento empresarial (business performance measurement), así como una axonomía de estas medidas y el impacto del movimiento de la calidad total en las prácticas de medición. Las medidas que presentamos se caracterizan por (1) medir la productividad y la calidad desde la perspectiva del cliente; (2) estar orientadas a las operaciones, más que al control contable; y (3) ser desagregadas ...

  6. Equipo compacto de medida de impedancia eléctrica multifrecuencia basado en señales multiseno

    OpenAIRE

    Sánchez Terrones, Benjamín; Bragós Bardia, Ramon

    2009-01-01

    A continuación se presenta el desarrollo e implementación de un sistema compacto de medida multifrecuencia de Espectroscopia de Impedancia Eléctrica (EIE). A diferencia de los equipos clásicos de medida de impedancia eléctrica basados en la técnica de barrido frecuencial, dicho sistema permite la caracterización instantánea del espectro de impedancia gracias a la realización simultánea de múltiples medidas espectrales mediante el uso de señales multiseno. Para disminuir el error en d...

  7. Las medidas de dispersión en el estudio de la inferencia estadística

    OpenAIRE

    Batanero, Carmen; López-Martín, María del Mar; González-Ruiz, Ignacio; Díaz-Levicoy, Danilo

    2015-01-01

    Dentro del conjunto de medidas utilizadas en el análisis de datos encontramos las medidas de dispersión. Aunque estas medidas son esenciales para obtener conclusiones sobre algunas de las herramientas empleadas tanto en la estadística descriptiva como en la inferencia estadística, las investigaciones sobre ellas en educación estadística son escasas. En el currículo español vigente, dentro de los diversos niveles educativos, su estudio se introduce, inicialmente, vinculándolo al concepto de di...

  8. Medida del coeficiente d33 de piezocomposites por interferometría láser

    Directory of Open Access Journals (Sweden)

    Montero de Espinosa, F.

    2002-02-01

    Full Text Available The measurement of piezoelectric coefficient d33 is made using devices like the Berlincourt Meter ®, based on a force generator internally calibrated by a reference piezoelectric element which measures the charge ratio Culomb/Newton. For estructures such as piezoelectric composites, formed by materials of very different elastic properties, the measurements made by the described system present a great dispersión which depends on both the size of the pressing head and the aplied arm pressure. This work presents a set of systematic measurements of d33 for several piezocomposite geometries by means of optical interferometry. These measurements are compared with those obtained with the Berlincourt. It is observed that both techniques render closer results as the net step is reduced.La medida del coeficiente piezoeléctrico d33 se realiza utilizando equipos como el Berlincourt Meter ®, basados en un generador de fuerza calibrado internamente por un elemento piezoeléctrico de referencia que mide la relación de carga, Culombio/ Newton. Estos sistemas están absolutamente contrastados, tomando los grupos de investigación sus medidas como estándar. En el caso de estructuras tales como los composites piezoeléctricos, en los que la estructura está formada por materiales de muy distinta elasticidad, bien por este hecho, bien por la misma estructura, las medidas con el sistema descrito presentan una gran dispersión dependiendo del tamaño de la cabeza presionante y la presión del brazo. Dado que en el modelado de resonadores piezocomposite para su uso en aplicaciones con acoplamiento en aire es necesario conocer dicho parámetro sin incertidumbre, se presentan en el trabajo una serie de medidas sistemáticas de dicho coeficiente para varias geometrías de piezocomposites utilizando interferometría óptica. Se relaciona así mismo estas medidas con el resultado obtenido con el equipo estándar antes referido observando como cuanto más pequeño es

  9. Human exposition to non ionizing electromagnetic radiations. Legislation and base stations measurements Exposición humana a las radiaciones electromagnéticas no ionizantes. Legislación y medidas de estaciones base

    Directory of Open Access Journals (Sweden)

    Antonio García Pino

    2004-12-01

    Full Text Available This work deals about measurement procedures of non-ionizing radiations and their recorded levels in practice. The analyzed radiation sources cover the most common broadcasting media such as AM and FM transmissions and the GSM mobile telephony base stations. These sources currently radiate locations with high density of population. Spanish radiation level regulations are briefly described and some possible improvements are pointed out. The measurement results are discussed.Este trabajo trata sobre los procedimientos de medida de las radiaciones no ionizantes y sus niveles registrados en medidas reales. Las fuentes de radiación analizadas cubren los medios de radiodifusión más corrientes, tales como las transmisiones AM y FM y también las estaciones base de telefonía móvil GSM. Estas fuentes habitualmente radian sobre áreas con alta densidad de población. Se describe brevemente el marco legal que regula los niveles de radiación en España y se señalan algunas posibles mejoras. Se valorarán los resultados encontrados en las medidas.

  10. Conocimiento y cumplimiento de medidas de bioseguridad en personal de enfermería. Hospital Nacional Almanzor Aguinaga. Chiclayo 2002

    National Research Council Canada - National Science Library

    Soto, Víctor; Olano, Enrique

    2004-01-01

    Objetivo: Determinar el nivel de conocimientos y cumplimiento de las medidas de bioseguridad del personal profesional y técnico de enfermería que labora en áreas de alto riesgo. Material y Métodos...

  11. LAS MEDIDAS CONSERVATIVAS COMO PARTE INTEGRANTE DE LA ESTRUCTURA DEL EMBARGO / PRECAUTIONARY MEASURES AS PART OF SEIZURE

    National Research Council Canada - National Science Library

    Alberto González Vidal

    2010-01-01

    El presente trabajo trata acerca de si la medida conservativa de la anotación registrai de la traba sobre bienes inmuebles o derechos reales constituidos sobre ellos forma o no parte integrante de la estructura del embargo...

  12. [X-ray hardening correction for ICT in testing workpiece].

    Science.gov (United States)

    Peng, Guang-han; Cai, Xin-hua; Han, Zhong; Yang, Xue-heng

    2008-06-01

    Since energy spectrum of X-ray is polychromatic source in X-ray industrial computerized tomography, the variation of attenuation coefficient with energy leads to the lower energy of X-ray radiation being absorbed preferentially when X-ray is transmitting the materials. And the higher the energy of X-ray, the lower the attenuation coefficient of X-ray. With the increase in the X-ray transmission thickness, it becomes easier for the X-ray to transmit the matter. Thus, the phenomenon of energy spectrum hardening of X-ray takes place, resulting from the interaction between X-ray and the materials. This results in false images in the reconstruction of X-ray industrial computerized tomography. Therefore, hardening correction of energy spectrum of X-ray has to be done. In the present paper, not only is the hardening phenomenon of X-ray transmitting the materials analyzed, but also the relation between the X-ray beam sum and the transmission thickness of X-ray is discussed. And according to the Beer law and the characteristics of interaction when X-ray is transmitting material, and by getting the data of X-ray beam sum, the relation equation is fitted between the X-ray beam sum and X-ray transmission thickness. Then, the relation and the method of equivalence are carried out for X-ray beam sum being corrected. Finally, the equivalent and monochromatic attenuation coefficient fitted value for X-ray transmitting the material is reasoned out. The attenuation coefficient fitted value is used for product back-projection image reconstruction in X-ray industrial computerized tomography. Thus, the effect caused by X-ray beam hardening is wiped off effectively in X-ray industrial computerized tomography.

  13. Confiabilidade da medida de espessuras musculares pela ultrassonografia Reliability of muscle thickness measurements using ultrasound

    Directory of Open Access Journals (Sweden)

    Paulo Sergio Chagas Gomes

    2010-02-01

    Full Text Available OBJETIVO: Determinar a confiabilidade das medidas de espessuras dos músculos flexores e extensores do cotovelo e joelho pela ultrassonografia (US, quantificando o erro típico associado a essas medidas (ETM. MÉTODOS: A confiabilidade (duas medidas interdias foi determinada em 15 voluntários aparentemente saudáveis (oito mulheres, 33,9 ± 11,4 anos, 76 ± 21kg, 170 ± 10cm. As imagens da musculatura flexora (FC e extensora do cotovelo (EC e flexora (FJ e extensora do joelho (EJ foram obtidas pela US bidimensional no modo B, utilizando transdutor de 7,5MHz. As espessuras do tecido muscular compreendidas entre as interfaces com o osso e com o tecido adiposo foram medidas em sítios anatômicos identificados e registrados para ser repetidos na segunda medida. RESULTADOS: A ANOVA não identificou diferenças significativas entre as medidas repetidas. Os coeficientes de correlação intraclasse foram FC = 0,970, EC = 0,971, FJ = 0,555 e EJ = 0,929 (P PURPOSE: To determine the reliability of muscle thickness measurements of elbow and knee flexors and extensors using ultrasound, and to quantify the typical error associated to the measurements (TEM. METHODS: The test-retest reliability was determined in 15 apparently healthy volunteers (8 women, 34 ± 11 years, 76 ± 21 kg, 170 ± 10 cm. The images of elbow flexors (EF and extensors (EE and knee flexors (KF and extensors (KE were obtained using a two dimensional mode B ultrasound instrument with a 7.5 MHz transducer. Muscle thickness between the adipose tissue and bone interfaces were measured at anatomical landmarks previously identified and recorded to assure the exact site for the retest. RESULTS: ANOVA did not identify any significant differences between the repeated measurements. Intraclass correlation coefficients (ICC of each pair of measure were EF = 0.970, EE = 0.971, KF = 0.555 e KE = 0.929 (P < 0.05 for all. The coefficients of variation were 3.9 %, 6.1 %, 6.6 % e 4.6 %, and TEM 1.3 mm, 1

  14. Medidas directas e indirectas de las funciones ejecutivas en niños con trastorno de espectro autista

    Directory of Open Access Journals (Sweden)

    María Fernanda Pérez Pichardo

    2018-01-01

    Full Text Available INTRODUCCIÓN: los niños con trastorno del espectro autista (TEA tienen dificultades en las funciones ejecutivas (FE pero se han sugerido discrepancias entre las medidas directas e indirectas.   OBJETIVO: conocer si existen diferencias en las funciones ejecutivas mediante medidas directas e indirectas entre niños con y sin TEA.   MÉTODO: se incluyeron 14 varones entre primero y tercero de primaria, 50% con diagnóstico de TEA y 50% con desarrollo neurotípico, seleccionados por emparejamiento en edad y grado escolar. El promedio de edad de la muestra fue de 7.43 (DE 0.98 años. Se aplicaron las pruebas de Evaluación neuropsicológica de funciones ejecutivas en niños (ENFEN y el Inventario de clasificación comportamental de las funciones ejecutivas (BRIEF.   RESULTADOS: se encontraron diferencias significativas en las medidas de las FE indirectas, pero no en las directas, entre los grupos (p < 0.05. Así mismo, las correlaciones entre las medidas directas e indirectas fueron mayores en el grupo con TEA.   CONCLUSIONES: los niños con TEA son evaluados con más dificultades en las medidas indirectas de las funciones ejecutivas, pero obtienen puntuaciones similares a los niños con desarrollo neurotípico cuando son evaluados en condiciones estructuradas empleando medidas directas.

  15. VIOLENCIA DE GÉNERO EN LAS UNIVERSIDADES: INVESTIGACIONES Y MEDIDAS PARA PREVENIRLA

    Directory of Open Access Journals (Sweden)

    Rosa Larena

    2010-12-01

    Full Text Available Normal 0 21 false false false ES ZH-TW X-NONE MicrosoftInternetExplorer4 En este artículo recogemos los resultados de la investigación “Violencia de género en las universidades españolas”, la primera investigación que analiza la violencia de género en el contexto universitario en España. Las investigaciones sobre esta clase de violencia en el ámbito internacional muestran, por un lado, que es una realidad existente en la universidad, de la misma forma que lo es en otros ámbitos sociales. Por otro lado, el análisis de las actuaciones implementadas por universidades de prestigio muestra la existencia de diferentes medidas para prevenirla y superarla. Estas evidencias, contrastadas con las percepciones de diferentes colectivos de la comunidad universitaria sobre la aplicabilidad de estas medidas en las universidades españolas, son el punto de partida para iniciar el desarrollo de medidas que erradiquen la violencia de género en nuestras universidades. In this article we present the findings from the research “Gender violence in Spanish universities”, the first study that analyses gender violence in the university context in Spain. Studies on gender violence at the international level show, on the one hand, that gender violence is a reality that exists in universities, in the same way that it exists in other social contexts. On the other hand, the analysis of the actions implemented in prestigious universities shows the existence of measures to prevent and overcome it. Contrasting these evidences with the perceptions of different university collectives about the applicability of these measures in Spanish universities is the starting point to develop measures to eradicate gender violence in our universities.

  16. Um dos desafios da questão social: adolescentes em cumprimento de medida sócioeducativa em Araraquara-SP

    OpenAIRE

    Beretta, Regina Célia de Souza [UNESP

    2010-01-01

    O presente trabalho tem como objeto a discussão das medidas sócio-educativas no município de Araraquara - SP, analisando a sua eficácia, eficiência e efetividade e seus impactos na inclusão social dos adolescentes no cumprimento de medidas de privação de liberdade e meio aberto. Ao se discutir adolescentes nas medidas sócio-educativas, freqüentemente a ênfase é dada às medidas de privação de liberdade e muito pouco se sabe sobre as medidas em meio aberto, campo ainda pouco explorado. Consider...

  17. Una propuesta de enseñanza para abordar las medidas de longitud

    OpenAIRE

    Garavito, Sara

    1999-01-01

    En la elaboración de un diseño de clase para trabajar las medidas de longitud y en su posterior aplicación, se encontró que hay diferencias entre lo que se pretende e imagina al momento de planear y lo que realmente sucede en el salón de clase cuando se lleva a la práctica el diseño. Esto pone de relieve que la reflexión durante y después de la acción es tan importante como la que se realiza previamente.

  18. VALORACIÓN DE LA LEY 28/2005 DE MEDIDAS SANITARIAS FRENTE AL TABAQUISMO

    OpenAIRE

    Villalbí, Joan R.

    2009-01-01

    La entrada en vigor en 2006 de la Ley 28/2005 de medidas sanitarias frente al tabaquismo representó un hito en la salud pública moderna en España. La ley incluyó tres aspectos regulatorios: eliminó la publicidad directa e indirecta y el patrocinio de tabaco, redujo los puntos de venta y prohibió el consumo en lugares de trabajo y espacios públicos cerrados, con algunas excepciones concentradas en establecimientos de restauración y hostelería. De manera concomitante con su entrada en vigor ...

  19. Modelos teóricos en inteligencia emocional y su medida

    OpenAIRE

    Chamarro Lusar, Andrés

    2004-01-01

    El de 'inteligencia emocional' se ha convertido en uno de los conceptos psicológicos más populares. Este hecho presenta, sin duda, diversos aspectos positivos como, por ejemplo, el interés generalizado por las emociones y las competencias personales y su desarrollo en aras de una mejor adaptación social y laboral. En este artículo se procederá a describir las diferentes perspectivas teóricas más actuales en inteligencia emocional así como los instrumentos de medida desarrollados hasta este mo...

  20. (In)Civilidade no Trabalho: Escalas de Medida e Efeitos no Burnout e Engagement

    OpenAIRE

    Nitzsche, Martina

    2016-01-01

    A literatura científica indica que a incivilidade e a civilidade no trabalho, dois fenómenos inerentes ao ambiente social do trabalho, têm implicações importantes para o bem estar psicológico dos trabalhadores. Em Portugal, há uma ausência de estudos sobre estes fenómenos, e não existem medidas específicas de incivilidade e civilidade no trabalho, validadas para o contexto profissional português. Para colmatar estas lacunas na litera...

  1. Abdominoplastia y pexia de pubis: estandarización de medidas

    OpenAIRE

    O. Ballestas-Campo; A. Pomerane

    2014-01-01

    La abdominoplastia es el procedimiento de elección para corregir la flacidez abdominal, la lipodistrofia supra e infraumbilical y la diástasis de los rectos abdominales. Los nuevos métodos añaden liposucción para definir el contorno corporal. Presentamos una estandarización de medidas para lograr una cicatriz abdominal baja y pexia pubiana en casos de lipodistrofias tipo III y IV de Matarasso. Realizamos un estudio observacional, descriptivo y retrospectivo, evaluando las historias clínicas y...

  2. Enfermedades priónicas: riesgos y medidas preventivas en Odontología

    OpenAIRE

    Dardanelli, Y.; Luque, W.

    2015-01-01

    El objetivo del presente trabajo es hacer una revisión de los últimos trabajos de investigación sobre las enfermedades priónicas para poder actualizar y transmitir información sobre las medidas de prevención y bioseguridad de estos agentes infecciosos no convencionales. Los priones son glucoproteínas situadas en las superficies celulares. Las versiones modificadas de los priones normales ocasionan enfermedades de progresión lenta, a menudo mortales del sistema nervioso central, una de las más...

  3. El criterio o principio de equivalencia en el contexto de las medidas sanitarios y fitosanitarias

    OpenAIRE

    León, Marlen

    2014-01-01

    El Acuerdo sobre Medidas Sanitarias y Fitosanitarias, aprobado por la República de Costa Rica, mediante ley número 7475 del 26 de Diciembre de 1994, incorporó a la legislación costarricense un documento de gran importancia y que ha tenido un escaso desarrollo jurídico.Este acuerdo se desarrolla en el contexto del comercio internacional, contemplando criterios esenciales, tales como:- No discriminación arbitraria- Protección de la vida y la salud humana- Protección de la salud animal- Protecci...

  4. MEDIDAS PARA EL CONTROL DEL TABACO EN MÉXICO Y EN EL MUNDO

    OpenAIRE

    Nazira Calleja

    2012-01-01

    Dadas las graves consecuencias de salud, ambientales, sociales, políticas y económicas que el tabaquismo origina en el mundo, numerosos organismos internacionales, gobiernos nacionales y organismos no gubernamentales han emprendido acciones enérgicas dirigidas a reducir el consumo de tabaco. En mayo de 2003, la Organización Mundial de la Salud (OMS) adoptó, por unanimidad, el Convenio Marco para el Control del Tabaco, cuyo objetivo es señalar las medidas que los países deben instrumentar con ...

  5. Cirrosis hepática: medidas preventivas de algunas de sus complicaciones

    OpenAIRE

    Claudio L. Toledo, A.

    2010-01-01

    Cirrosis hepática es una enfermedad prevalente en el mundo. Su diagnóstico y tratamiento debe ser dominio de todo médico general e internista. En los últimos años han ocurrido notables avances en el diagnóstico, fisiopatología, tratamiento y en la identificación de factores pronósticos de cirrosis y de sus complicaciones mayores. Particular atención ha existido en desarrollar medidas preventivas de sus complicaciones como por ejemplo: hemorragia por várices esofágicas, peritonitis bacte...

  6. Arrecifes artificiales como medidas de restauración de hábitats marinos costeros

    OpenAIRE

    Ramos-Esplá, Alfonso A.

    2002-01-01

    Dentro de las medidas de restauración y rehabilitación de ecosistemas costeros, los arrecifes artificiales representan una herramienta de ordenación y protección ecológica. Hay numerosos ejemplos a nivel mundial donde estas estructuras se han usado para realizar varias funciones, entre ellas la protección física de ecosistemas sensibles y frágiles, la adición o reposición de la complejidad de hábitat, la creación de nuevos sustratos y la sustitución de un recurso socioeconómico, entre otro...

  7. Método del “Pulso Láser” para la medida de la difusividad térmica en materiales cerámicos

    Directory of Open Access Journals (Sweden)

    García, E.

    2001-08-01

    Full Text Available Among the several techniques available to measure the thermal conductivity/ diffusivity, the laser flash method stands out for its low run time (less than 1 hour per temperature and the reduced sample size required. Nevertheless, the laser flash technique is not very accurate for porous materials due to laser transmission problems and the underestimation of the total sample thickness. The attaching to the porous sample of two thin foils of an opaque and high diffusivity material (Cu can solve these problems. This type of assembly was used to measure diffusivity in a porous alumina material. Data obtained are compared with theoretical models, wich predict effective thermal conductivity of the porous material from the thermal conductivity of the dense material, the amount of porosity and the type of microstructure.

    Entre las distintas técnicas de medida de la conductividad/difusividad térmica de materiales, destaca la técnica del pulso láser por la rapidez de medida de la difusividad térmica y la facilidad de preparación de las muestras. Sin embargo, cuando se mide la difusividad térmica en materiales porosos, aparecen problemas relacionados con la transmisión del haz láser y la subestimacion del espesor de la muestra. En este trabajo, se propone un método para evitar estos problemas que consiste en formar un sistema tricapa Cu/material poroso/Cu. Este método se ha verificado experimentalmente utilizando materiales de alúmina densa y porosa. Los valores experimentales para la alúmina porosa se han explicado a partir de modelos que estiman la conductividad térmica efectiva de un material poroso en función de la conductividad del material denso, la porosidad y el tipo de microestructura.

  8. The automotive transmission book

    CERN Document Server

    Fischer, Robert; Jürgens, Gunter; Najork, Rolf; Pollak, Burkhard

    2015-01-01

    This book presents essential information on systems and interactions in automotive transmission technology and outlines the methodologies used to analyze and develop transmission concepts and designs. Functions of and interactions between components and subassemblies of transmissions are introduced, providing a basis for designing transmission systems and for determining their potentials and properties in vehicle-specific applications: passenger cars, trucks, buses, tractors, and motorcycles. With these fundamentals the presentation provides universal resources for both state-of-the-art and future transmission technologies, including systems for electric and hybrid electric vehicles.

  9. X-ray data booklet. Revision

    Energy Technology Data Exchange (ETDEWEB)

    Vaughan, D. (ed.)

    1986-04-01

    A compilation of data is presented. Included are properties of the elements, electron binding energies, characteristic x-ray energies, fluorescence yields for K and L shells, Auger energies, energy levels for hydrogen-, helium-, and neonlike ions, scattering factors and mass absorption coefficients, and transmission bands of selected filters. Also included are selected reprints on scattering processes, x-ray sources, optics, x-ray detectors, and synchrotron radiation facilities. (WRF)

  10. Adaptation of a quantitative programme for the X-ray analysis of solubilized tissue as microdroplets in the transmission electron microscope: application to the moult cycle of the shrimp Crangon crangon (L).

    Science.gov (United States)

    Nott, J A; Mavin, L J

    1986-09-01

    A quantitative programme for X-ray microanalysis is used in a non-standard manner on solubilized tissue which has been spiked with cobalt and sprayed as microdroplets on electron microscope grids. During the procedure the count time and the concentration of cobalt is related to the peak integral and, from the relative efficiencies, the concentrations of other elements are computed from the peak integrals. Absorption is taken into account but the X-ray background is not used to estimate the total mass and the beam current is not measured. The method is applied to the hepatopancreas and blood from individual shrimps, Crangon crangon, to give the concentrations of sodium, magnesium, silicon, phosphorus, sulphur, potassium and calcium at different stages of the moult cycle. In the hepatopancreas the absolute and relative quantities of phosphorus, sulphur and other elements change in phase with the moult cycle. This situation must be linked with fluctuations in levels of metabolic activity and may affect the metal-binding capacity of the tissue which is known to fluctuate. The hepatopancreas accumulates lipid and phosphorus during the intermoult period, but the level of phospholipid phosphorus remains as a constant proportion of the tissue wet weight. The gland does not store calcium for hardening the new exoskeleton after ecdysis. Magnesium is a more important and variable component and could be linked with metabolic activity. The blood composition remains more stable. However, sulphur concentration is high and variable and this may, to some extent, reflect changes in the concentration of taurine. The concentration of copper increases towards the end of the moult cycle and decreases during moulting; opposite changes occur in the hepatopancreas.

  11. Tasa de reincidencia de la delincuencia juvenil de Extremadura. Medidas privativas de libertad Tasa de reincidencia de la delincuencia juvenil de Extremadura. Medidas privativas de libertad

    Directory of Open Access Journals (Sweden)

    Felipe Núñez Izquierdo

    2012-04-01

    Full Text Available Después de más de 10 años de entrada en vigor de la Ley Orgánica 5/2000, de 12 de enero, de Responsabilidad Penal del Menor, se hace imprescindible realizar un estudio sobre la reincidencia juvenil en Extremadura, para conocer el impacto de dicho precepto. No cabe duda que uno de los problemas que más alarma social genera en la población es la delincuencia cometida por los menores con responsabilidad penal. Inicialmente se hace un repaso a la literatura criminológica actual sobre la reincidencia, programas de prevención, tratamiento a menores delincuentes y la evaluación de la eficacia de dichos programas. En el presente trabajo, siguiendo la metodología de otros estudios nacionales como el de Catalunya, analizamos la reincidencia de la delincuencia juvenil en Extremadura, concretamente de las medidas privativas de libertad. Se analizan los expedientes judiciales cerrados de aquellos jóvenes que hubieran finalizado una medida de este tipo en el año 2007 y se realiza el seguimiento de los mismos hasta el año 2010. En el año 2007, 115 jóvenes cumplieron o estaban cumpliendo una medida privativa de libertad en un Centro de Menores o Permanencia Fin de Semana, de los cuales 63 (57 varones y 7 mujeres resultaron pertenecer a la muestra final objeto de análisis. Los resultados obtenidos revelan que la tasa de reincidencia es del 52,4%, similar a la de otras Comunidades Autónomas, como País Vasco o Catalunya, e inferior a la de Asturias. Otro dato relevante es que un 41,9% de los menores objeto de estudio presentaban antecedentes, por lo que se refleja un comienzo en carreras delictivas acorde con los estudios existentes. La presente investigación ayuda a conocer la eficacia de los diferentes programas que se aplican a los menores delincuentes que cumplen medidas de internamiento, así como también hace una crítica de ésta al situarla con una elevada tasa de reincidencia.After more than 10 years of the entry into force of the

  12. Colinesterasas en sangre total medidas con técnica semicuantitativa y en eritrocitos o plasma medidas con técnicas cuantitativas: relaciones

    Directory of Open Access Journals (Sweden)

    Jaime Carmona-Fonseca

    2007-06-01

    Resultados. Se evaluaron 827 trabajadores. Según la técnica Lovibond® se clasificaron en cuatro categorías: 821 con valores de 75% o más de actividad colinesterásica (categorías 75%, 87,5% y 100% y otros seis con actividad inferior a 75%. Con cada técnica cuantitativa los valores promedios de colinesterasa eritrocitaria y plasmática correspondientes a los cuatro valores de Lovibond® fueron estadísticamente diferentes entre sí. Los promedios de cada técnica cuantitativa fueron mayores a medida que creció el valor de la técnica semicuantitativa. Con Lovibond® se clasificó muy mal (61%-73% la baja actividad enzimática eritrocitaria, pero la clasificación de la baja actividad plasmática fue absolutamente errónea (94%-96%. Conclusión. Es posible estimar en forma adecuada los valores de colinesterasa eritrocitaria o plasmática que corresponden a las técnicas de Michel y EQM® a partir de datos de la técnica Lovibond® y viceversa, pero sólo cuando la actividad colinesterásica es normal, pues Lovibond® tiene una capacidad muy deficiente para identificar como "bajos" los valores que realmente lo son según las pruebas cuantitativas.

  13. A revelação de abuso sexual: as medidas adotadas pela rede de apoio

    Directory of Open Access Journals (Sweden)

    Luísa Fernanda Habigzang

    Full Text Available O presente estudo identificou e analisou as medidas adotadas pela rede de apoio de crianças e adolescentes após a revelação de abuso sexual. Participaram 40 meninas, entre oito e 16 anos, vítimas de abuso sexual. As medidas de proteção adotadas pela rede foram mapeadas através de entrevista semi-estruturada. A revelação foi feita aos pais em 42,5% da amostra e 92,5% das pessoas acreditaram. O abrigamento ocorreu em 35% dos casos e o restante permaneceu com a família que afastou o agressor. A atitude de confiança da família na revelação e a denúncia da violência constituíram-se em um fator de proteção. Contudo, o alto índice de abrigamento e o não acompanhamento efetivo do afastamento do agressor representaram fatores de risco.

  14. Transmission electron microscope studies of extraterrestrial materials

    Science.gov (United States)

    Keller, Lindsay P.

    1995-01-01

    Transmission Electron Microscopy, X-Ray spectrometry and electron-energy-loss spectroscopy are used to analyse carbon in interplanetary dust particles. Optical micrographs are shown depicting cross sections of the dust particles embedded in sulphur. Selected-area electron diffraction patterns are shown. Transmission Electron Microscope specimens of lunar soil were prepared using two methods: ion-milling and ultramicrotomy. A combination of high resolution TEM imaging and electron diffraction is used to characterize the opaque assemblages. The opaque assemblages analyzed in this study are dominated by ilmenite with lesser rutile and spinel exsolutions, and traces of Fe metal.

  15. Soil compaction: Evaluation of stress transmission and resulting soil structure

    DEFF Research Database (Denmark)

    Naveed, Muhammad; Schjønning, Per; Keller, Thomas

    Accurate estimation of stress transmission and resultant deformation in soil profiles is a prerequisite for the development of predictive models and decision support tools for preventing soil compaction. Numerous studies have been carried out on the effects of soil compaction, whilst relatively few...... and compaction-resulted soil structure at the same time. Stress transmission was quantified using both X-ray CT and Tactilus sensor mat, and soil-pore structure was quantified using X-ray CT. Our results imply that stress transmission through soil highly depends on the magnitude of applied load and aggregate...... studies have focused on the cause (mode of stress transmission in the soil). We have coupled both cause and effects together in the present study by carrying out partially confined compression tests on (1) wet aggregates, (2) air dry aggregates, and (3) intact soils to quantify stress transmission...

  16. [Focus on the role of ventilation and ultraviolet rays in preventing nosocomial transmission of tuberculosis in health care facilities. Groupe de travail sur la prévention de la transmission nosocomiale de la tuberculose (Direction Générale de la Santé)].

    Science.gov (United States)

    Desenclos, J C; Abiteboul, D; Bouvet, E; Brucker, G; Demeulemester, R; Haury, B; Huré, P; Leprince, A; Macrez, A; Mayaud, C

    1995-01-01

    Recent episodes of nosocomial tuberculosis, sometimes due to multiresistant strains, in HIV infected patients in the USA has led to the need for new prevention measures against the transmission of Mycobacterium tuberculosis in health care facilities. Tuberculosis is transmitted in Pflügge droplets generated when contagious persons cough. After drying, the droplets become aerosolized solid particles which are rapidly dispersed by air flow within the patient's room. People exposed to the same air are thus at high risk of being contaminated. If the air pressure in the patient's room is higher than the rest of the facility, the air coming form the room may contaminate personnel and other patients elsewhere in the facility. Infecting particles can be eliminated rapidly if the room air is ventilated outdoors. If the ventilation is strong enough so that air constantly circulates from the corridor into the room, infecting particles can no longer diffuse to the rest of the ward. It is also possible to use ultraviolet C light to disinfect the air, either within the room or within the ventilation system. These two basically simple systems are the fundamental environmental and prevention measures needed to limit tuberculosis spread in health care facilities. These methods are however technically complex, costly and require constant evaluation and maintenance by specialized personnel. In addition the potential side effects of ultraviolet waves could considerably reduce their application. These environmental methods, which are complementary methods, only have a meaning if the elementary measures for preventing the transmission of tuberculosis are correctly applied.(ABSTRACT TRUNCATED AT 250 WORDS)

  17. Iron redistribution in a zirconium alloy after neutron and proton irradiation studied by energy-dispersive X-ray spectroscopy (EDX) using an aberration-corrected (scanning) transmission electron microscope

    Energy Technology Data Exchange (ETDEWEB)

    Francis, E.M., E-mail: Elisabeth.Francis@manchester.ac.uk [The University of Manchester, Manchester Materials Science Centre, Grosvenor Street, Manchester M13 9PL (United Kingdom); Harte, A., E-mail: allan.harte@postgrad.manchester.ac.uk [The University of Manchester, Manchester Materials Science Centre, Grosvenor Street, Manchester M13 9PL (United Kingdom); Frankel, P., E-mail: philipp.frankel@manchester.ac.uk [The University of Manchester, Manchester Materials Science Centre, Grosvenor Street, Manchester M13 9PL (United Kingdom); Haigh, S.J., E-mail: Sarah.Haigh@manchester.ac.uk [The University of Manchester, Manchester Materials Science Centre, Grosvenor Street, Manchester M13 9PL (United Kingdom); Jädernäs, D., E-mail: daniel.jadernas@studsvik.se [Studsvik Nuklear AB, SE 611 82 Nyköping (Sweden); Romero, J., E-mail: romeroje@westinghouse.com [Westinghouse Electric Company, Columbia, SC (United States); Hallstadius, L., E-mail: hallstlg@westinghouse.com [Westinghouse Electric Sweden AB, SE-72163 Västerås (Sweden); Preuss, M., E-mail: Michael.preuss@manchester.ac.uk [The University of Manchester, Manchester Materials Science Centre, Grosvenor Street, Manchester M13 9PL (United Kingdom)

    2014-11-15

    Zirconium alloys used as cladding materials in nuclear reactors can exhibit accelerated irradiation induced growth, often termed linear growth, after sustained neutron irradiation. This phenomenon has been linked to the formation of -component dislocation loops and to the concentration of interstitial solute atoms. It is well documented for the Zircaloys that Fe dissolves from second phase particles (SPPs) during irradiation thus increasing the interstitial solute concentration in the matrix. However, no progress has yet been made into understanding whether a similar process occurs for the newer ZIRLO™ alloys. We aim to overcome this shortcoming here by studying compositional changes in second phase particles in Low Tin ZIRLO™ after neutron and proton irradiation using energy dispersive X-ray (EDX) spectroscopy. Material irradiated to 18 dpa (displacements per atom) using neutrons and to 2.3 and 7 dpa by protons was investigated. The results show that Fe is lost from Zr–Nb–Fe-SPPs during both neutron and proton irradiation. Prior to irradiation, Fe was detected at the interface of β-Nb-SPPs. This Fe enrichment is also dispersed during irradiation. Qualitatively, excellent agreement was found regarding the elemental redistribution processes observed after proton and neutron irradiation.

  18. Monitoreo neurointensivo en pediatría (III: Tratamiento. Medidas generales

    Directory of Open Access Journals (Sweden)

    Eduardo M. Pleguezuelo Rodríguez

    2001-06-01

    Full Text Available Se informa que con el neuromonitoreo y el manejo intensivo del traumatismo craneoencefálico grave, se han identificado un grupo de fenómenos fisiopatológicos diferentes, los cuales requieren de medidas disímiles y específicas para cada paciente, lo que hace más racional el tratamiento de ellos. De la misma manera esto ha propiciado que cambien radicalmente las concepciones acerca de antiguos patrones terapéuticos establecidos durante muchos años; ejemplo de esto es el cambio en la reposición hídrica de ellos, los cuales antes se mantenían sobre una vertiente seca y hoy se preconiza la euvolemia estricta, la sustitución de la hiperventilación de rutina por la ventilación optimizada, cambios en la política del uso de agentes osmóticos, la terapia barbitúrica y la craneotomía descompresiva en casos de hipertensión intracraneal refractaria a medidas terapéuticas convencionales. En este trabajo se hace una revisión actualizada de las principales medidas terapéuticas utilizadas en estos pacientes, acorde con lo que plantean los lineamientos para el tratamiento del traumatismo craneal grave de la Asociación Americana de Cirujanos Neurológicos y los del consorcio europeo para la lesión cerebral. Las medidas terapéuticas utilizadas en estos pacientes se dividen en 2 fases. En este tercer trabajo de actualización se aborda el manejo de la primera fase que corresponde a la estabilización urgente inicial antes de establecer la medición de la presión intracraneal (PIC, así como las medidas generales de la segunda fase una vez iniciado el monitoreo de la PIC. Principios terapéuticos que desde hace algunos años se vienen utilizando en el Hospital provincial General y el Hospital Pediátrico Provincial Docente de Camagüey para el manejo del trauma craneal grave, los cuales se basan en medidas iniciales en la recepción, acorde con lo que plantean los principios del soporte vital avanzado en trauma para la reanimaci

  19. Series Transmission Line Transformer

    Science.gov (United States)

    Buckles, Robert A.; Booth, Rex; Yen, Boris T.

    2004-06-29

    A series transmission line transformer is set forth which includes two or more of impedance matched sets of at least two transmissions lines such as shielded cables, connected in parallel at one end ans series at the other in a cascading fashion. The cables are wound about a magnetic core. The series transmission line transformer (STLT) which can provide for higher impedance ratios and bandwidths, which is scalable, and which is of simpler design and construction.

  20. Una medida de eficiencia de mercado. Un enfoque de teoría de la información

    Directory of Open Access Journals (Sweden)

    Reyna Susana García Ruiz

    2014-01-01

    Full Text Available En este trabajo, con base en el concepto de entropía de Shan-non, se propone una medida de eficiencia de mercado que uti-liza la función de densidad empírica de los rendimientos comoalfabeto para calcular la entropía del sistema y proveer con ellouna medida de eficiencia de mercado. Se demuestra que bajociertas condiciones de ergodicidad y de estacionariedad la en-tropía muestral converge a la entropía del estado dominante,lo que valida el uso de la entropía muestral como medida deeficiencia del sistema. Asimismo, se demuestra que la medidapropuesta es consistente con algunos de los axiomas de Artz-neret al.(1999 acerca de una medida coherente de riesgo. Porúltimo, con fines ilustrativos, se llevan a cabo varias aplicacio-nes de la medida de eficiencia propuesta a distintos mercadosde capitales: DJIA, S&P500, FTSE100 e IPC.

  1. Drivers of Tuberculosis Transmission.

    Science.gov (United States)

    Mathema, Barun; Andrews, Jason R; Cohen, Ted; Borgdorff, Martien W; Behr, Marcel; Glynn, Judith R; Rustomjee, Roxana; Silk, Benjamin J; Wood, Robin

    2017-11-03

    Measuring tuberculosis transmission is exceedingly difficult, given the remarkable variability in the timing of clinical disease after Mycobacterium tuberculosis infection; incident disease can result from either a recent (ie, weeks to months) or a remote (ie, several years to decades) infection event. Although we cannot identify with certainty the timing and location of tuberculosis transmission for individuals, approaches for estimating the individual probability of recent transmission and for estimating the fraction of tuberculosis cases due to recent transmission in populations have been developed. Data used to estimate the probable burden of recent transmission include tuberculosis case notifications in young children and trends in tuberculin skin test and interferon γ-release assays. More recently, M. tuberculosis whole-genome sequencing has been used to estimate population levels of recent transmission, identify the distribution of specific strains within communities, and decipher chains of transmission among culture-positive tuberculosis cases. The factors that drive the transmission of tuberculosis in communities depend on the burden of prevalent tuberculosis; the ways in which individuals live, work, and interact (eg, congregate settings); and the capacity of healthcare and public health systems to identify and effectively treat individuals with infectious forms of tuberculosis. Here we provide an overview of these factors, describe tools for measurement of ongoing transmission, and highlight knowledge gaps that must be addressed. © The Author 2017. Published by Oxford University Press for the Infectious Diseases Society of America.

  2. Overview on transmission issues

    Energy Technology Data Exchange (ETDEWEB)

    McNamara, F.

    2002-07-01

    A personal perspective of transmission issues in Alberta's deregulated electric power industry was presented. The deregulation of power transmission differs from power production and retailing because of its inherent monopolistic characteristics which include large economies of scale, huge capital intensity and special purpose equipment. Public policy makers recognized initially that open transmission access should be provided to all on the same basis, but the organizational form of transmission has become complicated. Transmission issues pose risks for private sector investment and long lead-times are needed to resolve issues such as congestion management, ancillary services, property rights, and loss factors. The author claims that power transmission should serve as a facilitating factor in the development of competitive markets. The paper explained the problems that Alberta is facing with the convergence of relativity, erosion of spare capacity, de-coupling decisions, imperfect substitutes, merchant transmission, and market footprints. Transmission issues now occupy more time than policy makers had originally expected. The Transmission Administrator's approach is to reduce lead times, develop clear commercial rules and show maximum flexibility within its role.

  3. The economic emergency: an insufficient solution La emergencia económica: una medida inconclusa

    Directory of Open Access Journals (Sweden)

    Lorente Luis

    1997-06-01

    Full Text Available There are many reasons for the Colombian recession that began in 1995, but the disagreement between fiscal and monetary authorities is an outstanding one. Monetary measures against inflation promoted high interest rates, made real investment more risky, rocketed the exchange rate, attracted foreign capital and elevated public debt costs.
    Emergency measures announced early in the year were insufficient because the problem comes from old and needs long range measures. Balanced budget is a valid target, but along the economic cycle and not in each fiscal year. Reduction of public expenses or public debt must be applied in periods of growth and not when taxes go down because a recession has begun. Monetary policy must allow for anti-cyclical measures and can do it effectively by controlling the volume. of credit accessible to the Government, or to finance private construction of public works, or to those that will buy the facilities and services that get privatized.La fase recesiva de la economía colombiana que comenzó en 1995 tiene varias causas, en especial, el desacuerdo entre políticas fiscales y monetarias. Las medidas antiinflacionarias elevaron las tasas de interés y dificultaron la inversión, y provocaron la revaluación de la moneda, la promoción de la entrada masiva de capital externo y del encarecimiento del servicio de la deuda pública. Las medidas de emergencia anunciadas a comienzos de 1995 no fueron suficientes: se necesita una política con objetivos de largo plazo. Hay que buscar un balance fiscal a lo largo del ciclo económico y no en cada año fiscal; la contracción del gasto público debe aplicarse en las fases de auge económico y no cuando caen los recaudos porque ya comenzó una recesión. La política monetaria debe permitir medidas anticíclicas y puede contribuir a ellas si regula el volumen de crédito accesible al Estado, a sus contratistas y a quienes adquieren prvatizaciones.

  4. Abdominoplastia y pexia de pubis: estandarización de medidas

    Directory of Open Access Journals (Sweden)

    O. Ballestas-Campo

    2014-06-01

    Full Text Available La abdominoplastia es el procedimiento de elección para corregir la flacidez abdominal, la lipodistrofia supra e infraumbilical y la diástasis de los rectos abdominales. Los nuevos métodos añaden liposucción para definir el contorno corporal. Presentamos una estandarización de medidas para lograr una cicatriz abdominal baja y pexia pubiana en casos de lipodistrofias tipo III y IV de Matarasso. Realizamos un estudio observacional, descriptivo y retrospectivo, evaluando las historias clínicas y las fotografías sobre 420 mujeres, con edades entre 18 y 63 años, intervenidas entre 2004 y 2011. Basamos la técnica quirúrgica en los siguientes principios: referencias anatómicas; medidas estandarizadas con la paciente de pie sobre zapatos de tacón alto para el trazado de una incisión suprapúbica baja, siguiendo diseño de los autores; pexia de pubis y región inguinal; cicatriz suprapúbica baja cubierta por un biquini estándar. El 70,95 % de los casos (298 pacientes correspondieron a abdomen grado IV de lipodistrofia, el 28,57 % (120 pacientes al grado III y el 0,47 % (2 pacientes al grado II según Matarasso. Las complicaciones más frecuentes fueron: seroma, (4,04 % , alteraciones cicatríciales (7,37 % , necrosis parcial y epidermolisis (2,38 % y estenosis umbilical (1,19 % . Como conclusión creemos que la estandarización de medidas para el diseño de la cicatriz en la abdominoplastia permite obtener resultados estéticos predecibles y funcionales buenos: cicatriz baja cubierta por un biquini o ropa interior estándar, cicatriz umbilical ovalada, pexia de pubis y excelente definición del contorno abdominal y corporal, con baja tasa de complicaciones.

  5. El índice de anisidina como medida del deterioro latente de un material graso

    Directory of Open Access Journals (Sweden)

    Grompone, M. A.

    1991-02-01

    Full Text Available Although the peroxide value is a common measurement of lipid oxidation, its use is limited to the initial stages of oxidation. Since peroxides are vulnerable to further decomposition, the complete oxidative history of the oil may not be revealed. The anisidine test a measure of secondary oxidation products, is considered useful in that it shows the past history of the oil. Effects of accelerated storage test on the anisidine and peroxide values of commercially samples were studied. The results obtained indicate that the anisidine value is a good method to predict storage stability of fats. Some processing steps in producing edible fats and oils were studied. Bleaching clay performs decomposition of oxidation products and this effect alone would reduce the peroxide value. Comparative studies were undertaken to determine the effects of bleaching on the anisidine value. Analysis of damaged oils before and after deodorization showed that little reduction of anisidine value occurred.

    El índice de anisidina como medida del deterioro latente de un material graso. A pesar de que el índice de peróxido es una medida corriente de la oxidación de los lípidos, su uso está limitado a las etapas iniciales de dicha reacción. Como los peróxidos pueden sufrir descomposiciones posteriores, la historia oxidativa completa del aceite no se conoce por ellos. Se considera que el índice de anisidina, una medida de los productos de la oxidación secundaria, es muy útil para evaluar el pasado del aceite. Se estudiaron los efectos del almacenamiento acelerado de muestras comerciales sobre los índices de anisidina y de peróxido. Los resultados obtenidos indican que el índice de anisidina es un buen método para predecir dicha estabilidad. Se estudiaron algunas etapas del procesamiento de las grasas y aceites comestibles. Las arcillas de blanqueo producen la descomposición de los productos de oxidación y este efecto sólo puede reducir el

  6. SERVIÇO SOCIAL, MEDIDAS SOCIOEDUCATIVAS E O ADOLESCENTE INFRATOR NO LIBERDADE ASSISTIDA

    Directory of Open Access Journals (Sweden)

    Cristiano Costa Carvalho

    2013-10-01

    Full Text Available RESUMO: A temática dos adolescentes em conflito com a Lei é uma questão que merece uma atenção especial, pois é significativa ao longo da trajetória pela conquista da mudança de paradigma na legislação em relação ao enfrentamento desta expressão da questão social, e porque mesmo diante desta mudança, as medidas em meio aberto são as que têm sido menos aplicadas. Deste modo, esta pesquisa permitiu conhecer e problematizar a atuação do profissional de Serviço Social dentro da política de atendimento aos adolescentes em conflito com a Lei e em destaque a medida socioeducativa no programa de Liberdade Assistida, devido a sua característica educativa que preserva o convívio social, familiar e comunitária.  O processo de preparação desta pesquisa consistiu em entrevistas semi-estruturadas, estudos bibliográficos, documentais, e acervos digitais. Foi analisado o potencial da atuação profissional em consonância com as diretrizes previstas pelo Estatuto da Criança e do Adolescente, Lei que garante aos mesmos um atendimento especial, e reconhece que são sujeitos em processo de formação. PALAVRAS-CHAVE: adolescentes, ato infracional, medidas socioeducativas ABSTRACT: The topic of minors in conflict with the Law is an issue that deserves special attention due to its representativeness in the course of attaining a paradigm shift in the legislation related to this social matter, and because even before this change takes place, it is the open regime measures that have been less applied. This research has therefore helped identify and discuss the role of the Social Worker in the assistance policy for juveniles in conflict with the Law, highlighting the socio-educational measure of the probation program “Liberdade Assistida”, which, due to its educational nature, preserves the social, family and community life. The process of preparing this research consisted of semi-structured interviews, bibliographical and documentary

  7. Equipo adiabático para medida del coeficiente de absorción específico de un material sometido a un campo magnético alterno y método para realizar dicha medida

    OpenAIRE

    Mediano, Arturo; Natividad, Eva; Palacio, Fernando; Castro, Miguel

    2007-01-01

    Equipo adiabático para medida del coeficiente de absorción específico de un material sometido a un campo magnético alterno y método para realizar dicha medida. En esta patente se describe un equipo que permite medir de forma adiabática el incremento de temperatura experimentado por aquellos materiales que presentan mecanismos activos de disipación de calor al someterlos a un campo magnético alterno. Conocida esta magnitud y el tiempo de aplicación del campo y, conocien...

  8. Variabilidade na mensuração das medidas orofaciais Variability of orofacial measures

    Directory of Open Access Journals (Sweden)

    Fernanda Veloso Rodrigues

    2008-01-01

    Full Text Available OBJETIVO: Verificar o grau da variabilidade das medidas orofaciais, entre fonoaudiólogos especialistas em Motricidade Orofacial. MÉTODOS: Estudo longitudinal prospectivo, tendo 30 fonoaudiólogos especialistas em Motricidade Orofacial realizado, em dois momentos distintos, com uso de paquímetro digital, a mensuração de dez medidas orofaciais de um sujeito padrão. Foram comparados os dados inter e intra-examinador por meio das medidas de tendência central, das medidas de dispersão e de testes de hipóteses, com nível de significância de 5%. RESULTADOS: Nove dos dez parâmetros investigados foram considerados como homogêneos na avaliação inter e intra-observadores. A abertura máxima da boca com língua na papila apresentou coeficientes de variação altos, indicando dados heterogêneos, apesar dos valores de correlação inter-observadores terem sido considerados semelhantes. Já na avaliação intra-examinador para este parâmetro foi evidenciada uma diferença significante (p=0,0384. Na análise dos dados, observou-se ainda diferenças próximas ao ponto de corte estabelecido no estudo, na mensuração intra-observador do terço médio da face (p=0,0711 e da abertura máxima da boca (p=0,0677. Dentre as dez variáveis analisadas, não foi observada diminuição do coeficiente de variação da 1ª para 2ª mensuração apenas nos parâmetros terço médio da face e lábio superior. CONCLUSÃO: Não foi observada variabilidade nas mensurações orofaciais realizadas, exceto para o parâmetro abertura m��xima da boca com língua na papila, indicando que dados produzidos por diferentes profissionais podem ser considerados parcialmente confiáveis.PURPOSE: To verify the degree of variability of orofacial measures, among speech pathologists who are specialists in orofacial myology. METHODS: A prospective study was carried out, where 30 speech pathologists who are specialists in orofacial myology measured, in two different moments

  9. Banco de pruebas para medida de fricción en pistones

    OpenAIRE

    Casanova Kindelán, Jesús; Aguirre Montoya, Viviana

    2005-01-01

    Se ha desarrollado un banco de pruebas con el propósito de estudiar las fuerzas de fricción que experimentan los pistones en un motor de combustión interna. Estas fuerzas se han medido utilizando el método IMEP desarrollado por Uras y Patterson. Este método se basa en el balance de fuerzas que actúan sobre el pistón determinándose la fuerza de fricción con la medida simultánea de la presión de los gases de combustión y la fuerza en la biela. Con el propósito de realizar el estudio...

  10. La Corte Constitucional colombiana ante las medidas de seguridad y defensa nacional del gobierno de Uribe

    Directory of Open Access Journals (Sweden)

    Miguel Revenga-Sánchez

    2010-03-01

    Full Text Available En este trabajo se describen las medidas de seguridad y defensa nacional impulsadas por el gobierno de Álvaro Uribe durante la vigencia del Estado de conmoción interior, así como el posicionamiento que la Corte Constitucional ha adoptado sobre estas, en ejercicio de su función de control de constitucionalidad. La negativa reiterada de la Alta Corte a dar su visto bueno a determinados preceptos restrictivos de los derechos fundamentales ha provocado que el Ejecutivo colombiano imponga el estatuto antiterrorista como parte del programa de seguridad democrática que lidera, mediante una reforma constitucional que es analizada en el presente artículo.

  11. Profitability measures of dairy cows Medidas de rentabilidade de vacas leiteiras

    Directory of Open Access Journals (Sweden)

    Anamaria Cândido Ribeiro

    2008-09-01

    Full Text Available This study was aimed at defining profitability measures designed for prediction of breeding values (EBV in dairy cows. Performance and economic data recorded in herds enrolled in the DHIA (Dairy Herd Improvement Association program in Kentucky, USA, were used to evaluate economic functions which included the following profitability measures: lifetime net income (LNI, efficiency (EF, milk income over feed costs (IOFC, net income per day of productive life (NIPL, net income at the end of the first lactation (NI1, and milk income over feed costs at the end of the first lactation (IOFC1. The estimated averages for LNI, EF, IOFC, NIPL, NI1 and IOFC1 were respectively US$ 532.13, 1.04, US$ 3038.19, US$ -0.16, US$ -69.34 and US$ 1293.77. The heritability estimates for these traits ranged from 0.06 to 0.09. The EBV and Spearman correlation estimates were positive, ranging from moderate to high values, suggesting a direct linear relationship among the profitability measures. LNI was the best profitability measure and genetic correlation estimates between LNI and economic measures recorded in first lactation (NI1 and IOFC1 were moderate (Os objetivos neste trabalho foram definir funções econômicas para vacas leiteiras, classificar os animais por seus valores genéticos estimados (EBV para cada uma destas medidas de rentabilidade e estimar correlações entre esses valores. As informações utilizadas foram provenientes de rebanhos participantes do programa da DHIA (Dairy Herd Improvement Association, em Kentucky, Estados Unidos. As características estudadas foram receita líquida vitalícia (LNI, eficiência (EF, receita do leite menos o custo de alimentação (IOFC, receita líquida por dia de vida produtiva (NIPL, receita líquida ao final da primeira lactação (NI1 e receita do leite menos o custo de alimentação ao final da primeira lactação (IOFC1. Os valores médios estimados foram US$ 532,13; 1,04; US$ 3038,19; US$ -0,16; US$ -69,34; e US

  12. Eventos estressores no desenvolvimento de meninas adolescentes cumprindo medidas sócio-educativas

    Directory of Open Access Journals (Sweden)

    Débora Dalbosco Dell'Aglio

    2005-04-01

    Full Text Available Este estudo investigou a ocorrência de eventos estressores no desenvolvimento de 50 adolescentes autoras de ato infracional, com idade entre 13 e 20 anos, que cumpriam medida sócio-educativa em órgão governamental. Os dados foram coletados através de entrevistas semi-estruturadas e de uma versão adaptada do Inventário de Eventos Estressores na Adolescência (IEEA. Foram identificados eventos estressores em diferentes domínios, como a ocorrência de maus-tratos, abuso sexual, uso de drogas, repetência escolar, desemprego e morte dos pais, que se constituem como fatores de risco no seu desenvolvimento. Estes aspectos revelam um ciclo de violência presente na trajetória destas adolescentes, no período anterior ao ato infracional.

  13. Nefropatia Induzida por Contraste: Medidas de Prevenção

    OpenAIRE

    Caroline Kaercher Kramer; Cristiane Bauermann Leitão; Luís Henrique Canani; Jorge Luiz Gross; Sandra Pinho Silveiro

    2008-01-01

    A nefropatia do contraste é definida como piora na função renal que se segue à administração de contraste intravenoso, tendo sido excluídas outras causas. A nefropatia do contraste manifesta-se, usualmente, como uma insuficiência renal aguda não oligúrica. Por definição, deve haver um aumento na creatinina basal de 25-50% ou um aumento superior a 0,5 mg/dl em 24-48 horas após o uso intravenoso de contraste, na ausência de outras causas de piora da função renal. As medidas de prevenção são bas...

  14. Prosopografia: estudo comparativo das medidas antropométricas de imagem padrão e questionada em sujeitos conhecidos

    Directory of Open Access Journals (Sweden)

    Joyce Fernandes de Azevedo

    2014-03-01

    Full Text Available Objetivo : comparar os resultados das medidas das faces conhecidas com a finalidade de comprovar os fundamentos das medidas e proporções existentes nos conceitos das ciências utilizadas pela Prosopografia.Métodos : a coleta desta pesquisa foi composta por três sujeitos. Coletaram-se fotografias dos documentos de Identificação Civil, retirou-se fotografia da face frontal, tratou-se em computador, retiraram-se as medidas e ângulos para a comparação.Resultados : realizou-se a identificação de sujeitos conhecidos em imagens em diferentes idades; Conclusão: constatou-se que o método quantitativo proposto apresenta-se efetivo para comprovar a compatibilidade de faces conhecidas.

  15. Sentidos da trajetória de vida para adolescentes em medida de liberdade assistida

    Directory of Open Access Journals (Sweden)

    Clara Costa Gomes

    2014-03-01

    Full Text Available O presente artigo trata de uma pesquisa que teve como objetivo compreender os sentidos atribuídos por adolescentes que cumpriam medida socioeducativa de liberdade assistida às trajetórias de vida e ao envolvimento com infrações à lei. Foram realizados sete sociodramas semanais com 21 adolescentes da comunidade, dos quais 18 eram do sexo masculino. As informações foram organizadas com base no modelo construtivo-interpretativo de González-Rey e analisadas à luz do aporte teórico da Psicossociologia. Da análise resultaram três zonas de sentido: 1 "Parecia uma vida fácil" - referente à sedução do mundo do crime; 2 "Minhas tábuas de salvação" - sobre as estratégias usadas ante os infortúnios da incursão infracional; 3 "A vida no crime não compensa" - concernente ao saldo das escolhas: dores, perdas e arrependimento. As discussões dos encontros desencadearam nos adolescentes relatos acerca do passado, presente e futuro e reflexões que conduzem à reconstrução de projetos de vida desvinculados de atos de infração. Concluiu-se que os métodos socionômico e de história de vida favoreceram a produção de sentidos pelos adolescentes a partir de sua proposta de ação e reflexão e forneceram informações relevantes para se compreender a trajetória infracional dos adolescentes, constituindo-se em poderosa ferramenta de pesquisa-intervenção junto a adolescentes em cumprimento de medidas socioeducativas.

  16. Adaptacao transcultural e confiabilidade de medidas de caracteristicas autorreferidas de vizinhanca no ELSA-Brasil

    Directory of Open Access Journals (Sweden)

    Simone M Santos

    2013-06-01

    Full Text Available OBJETIVO: Descrever o processo de adaptação de escalas de medida de características de vizinhança para o português brasileiro. MÉTODOS: As dimensões abordadas foram coesão social, ambiente propício para atividade física, disponibilidade de alimentos saudáveis, segurança em relação a crimes, violência percebida e vitimização. No processo de adaptação foram avaliados aspectos de equivalência entre as escalas originais e respectivas versões para o português. A confiabilidade teste-reteste foi avaliada em submostra de 261 participantes do Estudo Longitudinal de Saúde do Adulto (ELSA-Brasil que responderam ao mesmo questionário em dois momentos distintos em um intervalo de tempo de sete a 14 dias entre as duas aplicações. RESULTADOS: Os aspectos de equivalência avaliados mostraram-se adequados. O coeficiente de correlação intraclasse variou entre 0,83 (IC95% 0,78;0,87 para Coesão Social e 0,90 (IC95% 0,87;0,92 para Ambiente para Atividade Física. As escalas apresentaram consistência interna (alfa de Cronbach que variaram entre 0,60 e 0,84. CONCLUSÕES: As medidas autorreferidas de características de vizinhança tiveram reprodutibilidade muito boa e boa consistência interna. Os resultados sugerem que essas escalas podem ser utilizadas em estudos com população brasileira que apresente características similares àquelas do ELSA-Brasil.

  17. Contribuciones tecnicas para la medida de la contaminacion electromagnetica de microondas. Estudio en diversas poblaciones

    Science.gov (United States)

    Segura Garcia, Jaume

    La contaminacion ambiental por campos electromagneticos ha resultado ser en estos ultimos anos uno de los problemas mas acuciantes del panorama tecnologico y de salud publica. En el primero de los casos porque las inversiones realizadas son enormes y en el segundo porque cada vez es mayor el numero de articulos, "technical reports" e informes medicos que afirman la existencia de una cierta causalidad, aunque sea debil, entre los campos electromagneticos y ciertos cuadros sintomatologicos. En nuestro caso, hemos dedicado bastantes esfuerzos a investigar el llamado "sindrome de radiofrecuencia / microondas", denominado asi en la literatura cientifica por presentarse en operarios de estaciones de radar y en trabajadores de potentes emisoras de radio y television. En esta memoria presentamos un resumen del trabajo realizado durante los ultimos anos en la medida de la contaminacion electromagnetica ambiental asociado a las comunicaciones inalambricas. En ella se recogen los fundamentos fisicos y propiedades de las ondas electromagneticas, la tecnologia empleada en los sistemas de telefonia celular y los antecedentes relativos a la investigacion de la interaccion de las ondas electromagneticas con organismos vivos. Se desarrolla un procedimiento de medida que ha conducido a la elaboracion de los primeros "mapas de radiofrecuencia" similares, en el aspecto descriptivo, a los mapas de ruido desarrollados en el area de la contaminacion acustica. Por ultimo, se analiza la respuesta subjetiva de los residentes, personas que viven en el entorno de cobertura de las estaciones base de telefonia movil y que se ven sometidos a determinados niveles de radiacion electromagnetica, con el fin de situar este fenomeno al nivel que le corresponde en el ambito de la respuesta subjetiva ciudadana.

  18. Nefropatia Induzida por Contraste: Medidas de Prevenção

    Directory of Open Access Journals (Sweden)

    Caroline Kaercher Kramer

    2008-05-01

    Full Text Available A nefropatia do contraste é definida como piora na função renal que se segue à administração de contraste intravenoso, tendo sido excluídas outras causas. A nefropatia do contraste manifesta-se, usualmente, como uma insuficiência renal aguda não oligúrica. Por definição, deve haver um aumento na creatinina basal de 25-50% ou um aumento superior a 0,5 mg/dl em 24-48 horas após o uso intravenoso de contraste, na ausência de outras causas de piora da função renal. As medidas de prevenção são baseadas na correção dos fatores que levam ao desenvolvimento da nefropatia do contraste e dividem-se em: escolha de agentes de contraste menos nefrotóxicos (não-iônicos e utilização de doses menores; melhora no estado clínico do paciente com hidrata-ção; uso de drogas que reduzam vasoconstrição renal e estresse oxidativo; e suspensão temporária de drogas com potencial nefro-tóxico ou prejudiciais no caso de diminuição da filtração glomerular. A instituição de um protocolo com medidas preventivas em pacientes em risco e, especialmente, em diabéticos submetidos a contraste potencialmente nefrotóxico poderá reduzir a morbidade e custos associados ao seu desenvolvimento. A presente revisão tem o objetivo de descrever a definição e patogênese de nefropa-tia do contraste, enfatizando as principais recomendações de manejo para prevenir sua ocorrência.

  19. Poverty and price transmission

    DEFF Research Database (Denmark)

    Elleby, Christian

    A key parameter determining the welfare impact from a world market shock is the transmission elasticity which measures the average domestic response to an international price change. Many studies have estimated price transmission elasticities for a large number of countries but the variation in t...

  20. Data Transmission Concepts.

    Science.gov (United States)

    Christenson, Chris

    1995-01-01

    Introduces some basic concepts related to the transmission of data from a computer to its peripherals to help distance educators make decisions regarding computer equipment purchases for their institutions. The following data transmission concepts are described: cables, serial and parallel, synchronous and asynchronous, bandwidth, and analog and…

  1. Cultural Transmission of Civicness

    DEFF Research Database (Denmark)

    Ljunge, Jan Martin

    2012-01-01

    This paper estimates the intergeneration transmission of civicness by studying second generation immigrants in 29 European countries with ancestry in 83 nations. There is significant transmission of civicness both on the mother’s and the father’s side. The estimates are quantitatively significant...

  2. Cultural Transmission of Civicness

    DEFF Research Database (Denmark)

    Ljunge, Jan Martin

    This paper estimates the intergeneration transmission of civicness by studying second generation immigrants in 29 European countries with ancestry in 83 nations. There is significant transmission of civicness both on the mother’s and the father’s side. The estimates are quantitatively significant...

  3. Transmission Electron Microscopy Physics of Image Formation

    CERN Document Server

    Kohl, Helmut

    2008-01-01

    Transmission Electron Microscopy: Physics of Image Formation presents the theory of image and contrast formation, and the analytical modes in transmission electron microscopy. The principles of particle and wave optics of electrons are described. Electron-specimen interactions are discussed for evaluating the theory of scattering and phase contrast. Also discussed are the kinematical and dynamical theories of electron diffraction and their applications for crystal-structure analysis and imaging of lattices and their defects. X-ray microanalysis and electron energy-loss spectroscopy are treated as analytical methods. Specimen damage and contamination by electron irradiation limits the resolution for biological and some inorganic specimens. This fifth edition includes discussion of recent progress, especially in the area of aberration correction and energy filtering; moreover, the topics introduced in the fourth edition have been updated. Transmission Electron Microscopy: Physics of Image Formation is written f...

  4. Neutron transmission and capture of 241Am

    Directory of Open Access Journals (Sweden)

    Sage C.

    2013-03-01

    Full Text Available A set of neutron transmission and capture experiments based on the Time Of Flight (TOF technique, were performed in order to determine the 241Am capture cross section in the energy range from 0.01 eV to 1 keV. The GELINA facility of the Institute for Reference Materials and Measurements (IRMM served as the neutron source. A pair of C6D6 liquid scintillators was used to register the prompt gamma rays emerging from the americium sample, while a Li-glass detector was used in the transmission setup. Results from the capture and transmission data acquired are consistent with each other, but appear to be inconsistent with the evaluated data files. Resonance parameters have been derived for the data up to the energy of 100 eV.

  5. Medidas dinámicas de predictibilidad en el índice s&p 500 y sus determinantes

    OpenAIRE

    Javier Humberto Ospina Holguín

    2015-01-01

    El objeto de este estudio es medir la predictibilidad del índice accionario estadounidense S&P 500 y establecer posibles determinantes de esta predictibilidad. La predictibilidad se ha estudiado ampliamente, pero en pocos casos mediante medidas dinámicas y per se, como se hace aquí. Para establecer la predictibilidad se utilizan la medida eta del campo de las redes neuronales, el valor p del test de la razón de varianzas del campo de la econometría financiera y el análisis de fluctuación s...

  6. Medida de la eficiencia en entidades no lucrativas: un estudio empírico para fundaciones asistenciales

    OpenAIRE

    Martínez Franco, Carmen María; Guzmán Raja, Isidoro

    2014-01-01

    [ESP] La medida del rendimiento de cualquier unidad de decisión es un objetivo ciertamente deseable para conocer si la aplicación de sus recursos económicos (inputs) es adecuada en cada momento para conseguir su objetivo productivo. En este sentido, las entidades sin fines lucrativos no son ajenas a esta necesidad de gestión, presentando dificultades añadidas la medida de su desempeño, dado que por su carácter de «no lucrativas» su objetivo último no es la maximización de beneficio, sino la c...

  7. Medida de la eficiencia en entidades no lucrativas: un estudio empírico para fundaciones asistenciales

    OpenAIRE

    Martínez Franco, Carmen M.; Guzmán Raja, Isidoro

    2014-01-01

    La medida del rendimiento de cualquier unidad de decisión es un objetivo ciertamente deseable para conocer si la aplicación de sus recursos económicos (inputs) es adecuada en cada momento para conseguir su objetivo productivo. En este sentido, las entidades sin fines lucrativos no son ajenas a esta necesidad de gestión, presentando dificultades a˜nadidas la medida de su desempe˜no, dado que por su carácter de «no lucrativas» su objetivo último no es la maximización de beneficio, s...

  8. Base de datos de medidas electrocardiográficas para caninos residentes en la ciudad de Bogotá

    OpenAIRE

    Mauricio Ortega Tamayo; Edwin Andrés Cerquera; Rafael Gutiérrez Salamanca

    2006-01-01

    El siguiente trabajo presenta la base de datos Vetuan I, que contiene las medidas electrocardiográficas de 100 pacientes caninos sin anomalías cardíacas examinados en la Clínica Veterinaria Veteriland de la ciudad de Bogotá, y atendidos por personal de la Facultad de Medicina Veterinaria de la Universidad Antonio Nariño, Bogotá. Las medidas que se incluyen dentro de la base de datos, comprenden la duración y amplitud de de las ondas que componen un ciclo cardíaco en cada uno de los registros ...

  9. Sensores con fibra óptica de plástico para la medida remota de nivel

    OpenAIRE

    Vázquez García, María Carmen; Gonzalo, Ana B.; Romeral, J. J.; Sánchez-Pena, José Manuel

    2003-01-01

    4 págs, 9 figs.-- Presentado en: 3ª Reunión Española de Optoelectrónica (OPTOEL'03), Leganés (Madrid), 14-16 julio 2003. La industria demanda cada vez más métodos de medida que sean intrínsecamente seguros para aplicarlos en entornos industriales, como pueden ser atmósferas inflamables; y que eviten, en la medida de lo posible, el daño ecológico. Por ejemplo, en muchas gasolineras la necesidad de rellenar los depósitos de combustible se fija mediante control visual. Sin embargo, mientra...

  10. Gonio-espectrofotómetro para medidas de BRDF de patrones de reflectancia y objetos gonio-aparentes

    OpenAIRE

    Rabal Almazor, Ana María; Campos Acosta, Joaquín; Pons Aglio, Alicia

    2014-01-01

    En los últimos años, diferentes organizaciones internacionales de estandarización, como la Comisión Internacional de Iluminación (CIE), han estado trabajando sobre la problemática de la medida de la apariencia de los objetos, cuestión de extremada importancia en nuestra sociedad por las implicaciones de todo tipo que se derivan de ella. El concepto de apariencia está relacionado con los atributos perceptivos de color, brillo, translucidez y textura de los objetos; por tanto, la medida de la a...

  11. Medidas de Bioseguridad en una sala de disección de anatomía patológica

    OpenAIRE

    Margarita Mena Marín; Ted Alpízar Calvo; Fernando Mena Umaña

    2010-01-01

    El objetivo principal es analizar las medidas de bioseguridad en el laboratorio de disección de anatomía patológica del hospital Max Peralta en Cartago. Con el fin de valorar los riesgos asociados con la exposición al formaldehido, se utilizaron las guías de referencia de la Administración en Salud y Seguridad Ocupacional (OSHA) y del Instituto Nacional de Salud y Seguridad (NIOSH). Tomando en cuenta tres variables: uso de medidas de protección, diseño del laboratorio y ventilación. Los datos...

  12. TRANSMISSIBLE VENEREAL TUMOR - LITERATURE REVIEW

    Directory of Open Access Journals (Sweden)

    T. R. B Berndt

    2016-11-01

    Full Text Available Transmissible venereal tumor (TVT is a contagious disease among the family of canines. Has a high prevalence in temperate regions and mainly affects male and female dogs wandering. Transmissible venereal tumor's main characteristic is a sexually transmitted cancer, through intercourse, and also transmitted through cell transplantation, an animal that has the disease to another Sound, which has an abrasion or epithelial discontinuity through licking or contact direct to neoplasia. It has no known etiology, although some authors suggest that there may be some virus as an agent. Is macroscopically observed as a crumbly mass, ulcerated, hemorrhagic, with the appearance of cauliflower. Their cells, if observed microscopically, have very clear, round and giant nucleus stained cytoplasm, and the presence of vacuolated cells in mitosis. The diagnosis can be accomplished by fine needle aspiration cytology, "imprint", histopathology, imaging tests such as x-ray and ultrasound, which are used for observation of metastases in internal organs. The main treatment is chemotherapy with substances such as vincristine dose of 0.5 to 0.7 mg / m², intra venous (IV, or from 0.0125 to 0.025 mg / kg IV once a week, four to eight weeks, and for animals which have acquired resistance to vincristine sulfate, is associated with the chemotherapeutic doxorubicin at a dose of 30 mg / m² IV once a week for four to eight weeks. Some protocols include prednisolone associated with vincristine sulfate for the treatment of Extragenital TVT.

  13. Bordetella pertussis transmission.

    Science.gov (United States)

    Trainor, Elizabeth A; Nicholson, Tracy L; Merkel, Tod J

    2015-11-01

    Bordetella pertussis and B. bronchiseptica are Gram-negative bacterial respiratory pathogens. Bordetella pertussis is the causative agent of whooping cough and is considered a human-adapted variant of B. bronchiseptica. Bordetella pertussis and B. bronchiseptica share mechanisms of pathogenesis and are genetically closely related. However, despite the close genetic relatedness, these Bordetella species differ in several classic fundamental aspects of bacterial pathogens such as host range, pathologies and persistence. The development of the baboon model for the study of B. pertussis transmission, along with the development of the swine and mouse model for the study of B. bronchiseptica, has enabled the investigation of different aspects of transmission including the route, attack rate, role of bacterial and host factors, and the impact of vaccination on transmission. This review will focus on B. pertussis transmission and how animal models of B. pertussis transmission and transmission models using the closely related B. bronchiseptica have increased our understanding of B. pertussis transmission. © FEMS 2015. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  14. Food insecurity measurement and indicators Indicadores e medidas de insegurança alimentar

    Directory of Open Access Journals (Sweden)

    Rafael Pérez-Escamilla

    2008-08-01

    cinco métodos comumente utilizados em inquéritos nacionais para avaliação de insegurança alimentar. Desses, quatro são indiretos, ou medidas derivadas de insegurança alimentar (método da Organização das Nações Unidas para Agricultura e Alimentação, pesquisas de despesas familiares, avaliação de consumo e antropometria. O único método para medida direta ou fundamental de insegurança alimentar é representado por uma escala fundamentada na experiência de insegurança alimentar. Todos os métodos complementam-se mutuamente, o de escolha dependerá das perguntas a serem respondidas e dos recursos econômicos e logísticos disponíveis para coletar informações válidas. Todos os métodos possuem problemas sérios de erros de medida, que poderão ser reduzidos pelo conhecimento dos princípios nos quais estão baseados, além do envolvimento de pesquisadores de campo bem capacitados e padronizados. É promissor, como foi mostrado no Brasil, o uso de escala de medida baseada na experiência de insegurança alimentar, para mapear, identificar populações vulneráveis, compreender seus determinantes e conseqüências. Por essas razões, se recomendam, para a América Latina e o Caribe, trabalhos visando à adoção de instrumento regional único, adaptado aos contextos locais, a partir de investigações cognitivas qualitativas, seguidas de pesquisas de confirmação quantitativas das propriedades psicométricas das escalas. A experiência brasileira do projeto de medida de insegurança alimentar, provavelmente, oferecerá subsídios idéias úteis para outros países da região.

  15. Transmission Electron Microscopy and Diffractometry of Materials

    CERN Document Server

    Fultz, Brent

    2013-01-01

    This book explains concepts of transmission electron microscopy (TEM) and x-ray diffractometry (XRD) that are important for the characterization of materials. The fourth edition adds important new techniques of TEM such as electron tomography, nanobeam diffraction, and geometric phase analysis. A new chapter on neutron scattering completes the trio of x-ray, electron and neutron diffraction. All chapters were updated and revised for clarity. The book explains the fundamentals of how waves and wavefunctions interact with atoms in solids, and the similarities and differences of using x-rays, electrons, or neutrons for diffraction measurements. Diffraction effects of crystalline order, defects, and disorder in materials are explained in detail. Both practical and theoretical issues are covered. The book can be used in an introductory-level or advanced-level course, since sections are identified by difficulty. Each chapter includes a set of problems to illustrate principles, and the extensive Appendix includes la...

  16. Improving Object Classification in X-ray Luggage Inspection

    OpenAIRE

    SHI, XINHUA

    2000-01-01

    X-ray detection methods have increasingly been used as an effective means for the automatic detection of explosives. While a number of devices are now commercially available, most of these technologies are not yet mature. The purpose of this research has been to investigate methods for using x-ray dual-energy transmission and scatter imaging technologies more effectively. Followed by an introduction and brief overview of x-ray detection technologies, a model for a prototype x-ray scanning ...

  17. Medidas que puede tomar para prevenir el cáncer (Steps You Can Take to Prevent Cancer)

    Centers for Disease Control (CDC) Podcasts

    2012-02-02

    Este podcast habla de las principales medidas que las personas pueden tomar para reducir su riesgo de contraer cáncer.  Created: 2/2/2012 by National Center for Chronic Disease Prevention and Health Promotion (NCCDPHP).   Date Released: 3/13/2012.

  18. Medidas Sanitarias y Fitosanitarias, ¿Barreras al Comercio?: el Caso Peruano en el Asia-Pacífico

    Directory of Open Access Journals (Sweden)

    Marcelo Alonso Valverde Arevalo

    2016-01-01

    Full Text Available Los aranceles han dejado de representar la principal barrera al comercio exterior, debido a la reducción constante de éstos en el ámbito multilateral o bilateral. Contrariamente, las medidas no arancelarias han ido en aumento, siendo la principal preocupación para las exportaciones mundiales. En este escenario, se presentan las medidas sanitarias y fitosanitarias, las cuales sirven para proteger la salud de las personas, animales y plantas en contra de riesgos asociados con enfermedades, pestes u otros; sin embargo, por la naturaleza de las mismas pueden distorsionar el comercio hasta ser utilizadas con fines proteccionistas en favor de las industrias nacionales de los países importadores. El presente artículo cuestiona si es que a pesar de contar con una serie de acuerdos comerciales internacionales, los cuales han disminuido progresivamente los aranceles, el Perú ha logrado un acceso real al mercado del Asia-Pacífico con productos agropecuarios y pesqueros. En ese sentido, se presentan casos históricos y pendientes en materia de acceso a mercados por medidas de carácter sanitario o fitosanitario, tal como el acceso de paltas a Japón. Asimismo, se analizan las disposiciones de los acuerdos comerciales en materia de medidas sanitarias y fitosanitarias y se presentan las potenciales oportunidades que se establecen en estos acuerdos, a fin de agilizar el acceso a mercados internacionales, y que no se han aprovechado.

  19. As Inundações e Memória Social: Algumas Medidas De Prevenção ...

    African Journals Online (AJOL)

    As Inundações e Memória Social: Algumas Medidas De Prevenção e Controlo da Biodegradação Dos Documentos e Arquivos (Floods and Social Memory: Some Measures for the Protection and Control of Biodegradation in Records and Archives)

  20. Medidas dinámicas de predictibilidad en el índice s&p 500 y sus determinantes

    Directory of Open Access Journals (Sweden)

    Javier Humberto Ospina Holguín

    2015-04-01

    Full Text Available El objeto de este estudio es medir la predictibilidad del índice accionario estadounidense S&P 500 y establecer posibles determinantes de esta predictibilidad. La predictibilidad se ha estudiado ampliamente, pero en pocos casos mediante medidas dinámicas y per se, como se hace aquí. Para establecer la predictibilidad se utilizan la medida eta del campo de las redes neuronales, el valor p del test de la razón de varianzas del campo de la econometría financiera y el análisis de fluctuación sin tendencia del campo de la econofísica. Se construye un algoritmo de inversión basado en las medidas dinámicas de predictibilidad que es mejor que la estrategia de comprar y mantenerse en el periodo estudiado. Para la medida más promisoria, se establece una relación empírica entre la predictibilidad y varios factores económicos y financieros. El panorama que arroja este estudio es el de un mercado que no es estáticamente predecible, sino cuya predictibilidad evoluciona dinámicamente en el tiempo, lo cual es compatible con la hipótesis del mercado adaptativo.

  1. Impacto sonoro do aeroporto Santos Dumont/RJ: análise e medidas de controle

    Directory of Open Access Journals (Sweden)

    José R. de Lima Neto

    2014-09-01

    Full Text Available A poluição sonora é parte cotidiana da vida nas grandes cidades. Dentre as fontes sonoras relevantes no contexto das cidades, tais como o ruído viário, uma que oferece desafios particulares é a relacionada ao sobrevoo de aeronaves, sejam aviões comerciais, jatos particulares ou helicópteros. Por se tratar de fontes intensas de ruído e das características das suas trajetórias (extensas e acima das habitações, tanto a avaliação do incômodo gerado, como eventuais medidas de mitigação são complexas e de difícil implementação.Dessa forma, o desconforto acústico gerado nas comunidades próximas as rotas de pouso e decolagem de grandes aeroportos tornou-se alvo de grandes reclamações por parte dos moradores que tem seu conforto ameaçado, o que reforça a necessidade de enfrentar estes desafios e atacar este problema.Assim, nesse trabalho, buscamos avaliar o impacto sonoro das aeronaves que possuem como destino ou são oriundas do aeroporto Santos Dumont/RJ (SBRJ, através de simulação computacional de ruído, em uma região próxima ao aeroporto com área de aproximadamente 39 km². A partir da quantificação e determinação das áreas efetivamente afetadas pelo ruído aeronáutico, e da comparação dos valores obtidos com as normas da legislação brasileira, esse trabalho visa mapear possíveis regiões de conflito e fornecer informações que orientem possíveis medidas mitigadoras e de controle de ruído plausíveis para a realidade atual. Palavras-Chave: Acústica, Ruído aeronáutico, Impacto Sonoro de Aeroportos.

  2. Un criterio robusto para la medida del margen –coeficiente– de seguridad

    Directory of Open Access Journals (Sweden)

    Cervera, J.

    2010-06-01

    Full Text Available This paper offers a brief analysis of the drawbacks that can be found with the usual partial security coefficients, as loads multipliers, when employed for the measurement of the distance to the collapse condition in such structures, as masonry arches, that have important anisotropies or lacks tensile strength. To deal with such difficulties the paper presents a simple and robust security criterium based on a contraction of the yield surface. That criterium, that performs identically in isotropic structures to those usually employed, can however deal consistently with situations where former criteria fail. The criterium is applied to sections with double symmetry under axial load and unsymmetrical bending, in materials with and without tension resistance. It is also applied to the prism stability problem, showing the advantages in the caracterization of such problems.

    En este trabajo se analizan en primer lugar algunos inconvenientes de los habituales coeficientes parciales de seguridad —factores multiplicadores de las cargas— como medida del alejamiento a las condiciones de colapso en el caso de las estructuras con anisotropías importantes, como son especialmente aquellas sin resistencia a la tracción —los arcos de fábrica, como ejemplo paradigmático— Para superar dichas dificultades se propone un criterio sencillo y robusto basado en la contracción de la superficie límite, criterio que aporta una medida coincidente con la habitual para los casos isótropos, pero que permite medir igualmente de forma consistente el alejamiento a las condiciones del colapso para el resto de las situaciones. Se aplica finalmente el modelo a la determinación de los márgenes de seguridad en secciones de doble simetría sometidas a compresión esviada para materiales sin, y con resistencia a tracción, así como al problema de la estabilidad de un prisma frente al vuelco, mostrando las mejoras que aporta para caracterizar dichos problemas.

  3. Aplicaciones de los modelos multinivel al análisis de medidas repetidas en estudios longitudinales

    Directory of Open Access Journals (Sweden)

    María Victoria Zunzunegui

    2004-01-01

    Full Text Available Este trabajo es una introducción al análisis de medidas repetidas en estudios longitudinales. Se utiliza un marco analítico con dos etapas, ajustando modelos jerárquicos lineales con dos niveles. El primer nivel corresponde a la ocasión (tiempo de medida y el segundo al individuo. Estos modelos estadísticos proceden de las ciencias sociales, en las que se han utilizado durante más de 25 años para analizar datos en organizaciones con múltiples niveles. Su aplicación permite estudiar los cambios en alguna característica de interés (estado de salud o factor de riesgo y analizar las circunstancias que explican la variabilidad en las trayectorias individuales. En este trabajo se introducen los conceptos básicos de este método: variabilidad entre individuos y dentro de cada individuo a lo largo del tiempo, modelo del nivel individual para describir la trayectoria de cada individuo y modelo «entre individuos» para describir cómo cambian las trayectorias entre individuos, efectos fijos y efectos aleatorios, modelos de crecimiento lineal y cuadrático. Para ello se ha realizado un análisis de los cambios en la función cognitiva de una cohorte de personas mayores, el estudio «Envejecer en Leganés», seguida cada dos años, entre 1993 y 1999. Se presentan los resultados de modelos ajustados para resolver las preguntas de investigación más frecuentes en la descripción y el análisis de las trayectorias de cambio individual. Por último, se comentan posibles generalizaciones de estos modelos lineales jerárquicos a situaciones en las que la variable de interés no es continua, como es el caso de las variables dependientes dicotómicas, nominales u ordinales.

  4. Transmission Problem in Thermoelasticity

    Directory of Open Access Journals (Sweden)

    Muñoz Rivera JaimeE

    2011-01-01

    Full Text Available We show that the energy to the thermoelastic transmission problem decays exponentially as time goes to infinity. We also prove the existence, uniqueness, and regularity of the solution to the system.

  5. Automatic transmission vehicle injuries.

    Science.gov (United States)

    Fidler, M

    1973-04-07

    Four drivers sustained severe injuries when run down by their own automatic cars while adjusting the carburettor or throttle linkages. The transmission had been left in the "Drive" position and the engine was idling. This accident is easily avoidable.

  6. Kansas Electric Transmission Lines

    Data.gov (United States)

    Kansas Data Access and Support Center — This data set is a digital representation of the EletcircTransmission lines for the State of Kansas as maintained by the Kansas Corporation Commission. Data is...

  7. Electric Power Transmission Lines

    Data.gov (United States)

    Department of Homeland Security — Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power...

  8. Pregnancy & perinatal transmission update.

    Science.gov (United States)

    Denison, R

    1998-09-01

    According to a June 1998 report from UNAIDS, the majority of children infected with HIV acquired it from their mothers during or near birth. One way to prevent perinatal transmission of HIV is to increase prevention efforts for women. Other ways to prevent perinatal transmission include using AZT treatment, avoiding breastfeeding, and choosing a C-section delivery instead of a vaginal delivery. One important study, called the Thai study, promoted a shorter course of AZT therapy that was less expensive, more accessible, and still prevented transmission in many cases. Several reasons are cited for why some women continue breastfeeding, despite the increased risk of transmitting HIV to their babies. An important factor in preventing perinatal transmission is the overall health of the mother, and her ability to maintain her health and treatment regimen while caring for a newborn.

  9. Underwater Rays

    Science.gov (United States)

    Cepic, Mojca

    2008-01-01

    Light beams in wavy unclear water, also called underwater rays, and caustic networks of light formed at the bottom of shallow water are two faces of a single phenomenon. Derivation of the caustic using only simple geometry, Snell's law and simple derivatives accounts for observations such as the existence of the caustic network on vertical walls,…

  10. Watching Handball Transmissions

    DEFF Research Database (Denmark)

    Frandsen, Kirsten

    2010-01-01

    The current article presents a qualitative study of Danish television viewer’s reception of Danish handball transmissions. The overall aim of the study has been to contribute to a more nuanced understanding of televised sport as a specific kind of television entertainment. The analysis shows that...... is embedded in quite diverse patterns regarding additional media use. This points to gendered differences regarding how the entertaining experience is basically received and the qualities sought and pursued in the transmissions....

  11. Superconducting metamaterial transmission line

    Science.gov (United States)

    Rouxinol, Francisco; Wang, Haozhi; Plourde, B. L. T.

    2014-03-01

    Left-handed metamaterials are artificial composite structures with unusual properties. Such systems have a wide range of potential applications in photonics. We are developing transmission lines composed of superconducting metamaterials using thin-film lumped circuit elements. Such structures allow for the possibility of generating novel transmission spectra with a high density of modes in some frequency ranges and stop-bands in others. We discuss possible couplings of these lines to superconducting qubits in circuit QED architectures.

  12. Eliminating Perinatal HIV Transmission

    Centers for Disease Control (CDC) Podcasts

    2012-11-26

    In this podcast, CDC’s Dr. Steve Nesheim discusses perinatal HIV transmission, including the importance of preventing HIV among women, preconception care, and timely HIV testing of the mother. Dr. Nesheim also introduces the revised curriculum Eliminating Perinatal HIV Transmission intended for faculty of OB/GYN and pediatric residents and nurse midwifery students.  Created: 11/26/2012 by Division of HIV/AIDS Prevention.   Date Released: 11/26/2012.

  13. Base de datos de medidas electrocardiográficas para caninos residentes en la ciudad de Bogotá

    Directory of Open Access Journals (Sweden)

    Mauricio Ortega Tamayo

    2006-12-01

    Full Text Available El siguiente trabajo presenta la base de datos Vetuan I, que contiene las medidas electrocardiográficas de 100 pacientes caninos sin anomalías cardíacas examinados en la Clínica Veterinaria Veteriland de la ciudad de Bogotá, y atendidos por personal de la Facultad de Medicina Veterinaria de la Universidad Antonio Nariño, Bogotá. Las medidas que se incluyen dentro de la base de datos, comprenden la duración y amplitud de de las ondas que componen un ciclo cardíaco en cada uno de los registros electrocardiográficos de los pacientes examinados, utilizando como referencia las tres derivaciones bipolares, así como, las medidas de los ejes cardíacos. El propósito principal del trabajo es actualizar los datos de soporte al diagnóstico que se han venido utilizando a partir de la tabla de referencia implementada en los años 60 en Estados Unidos. Dentro de resultados se puede apreciar que las medidas que hacen parte de la base de datos Vetuan I, difieren del rango de medidas que se han venido tomando como referencia a partir de la tabla desarrollada en los años 60, por lo que se deduce que la dinámica cardiaca de los caninos depende fuertemente de los factores ambientales en que viven, específicamente la altura sobre el nivel del mar.

  14. National transmission grid study

    Energy Technology Data Exchange (ETDEWEB)

    Abraham, Spencer [USDOE Office of the Secretary of Energy, Washington, DC (United States)

    2003-05-31

    The National Energy Policy Plan directed the U.S. Department of Energy (DOE) to conduct a study to examine the benefits of establishing a national electricity transmission grid and to identify transmission bottlenecks and measures to address them. DOE began by conducting an independent analysis of U.S. electricity markets and identifying transmission system bottlenecks using DOE’s Policy Office Electricity Modeling System (POEMS). DOE’s analysis, presented in Section 2, confirms the central role of the nation’s transmission system in lowering costs to consumers through increased trade. More importantly, DOE’s analysis also confirms the results of previous studies, which show that transmission bottlenecks and related transmission system market practices are adding hundreds of millions of dollars to consumers’ electricity bills each year. A more detailed technical overview of the use of POEMS is provided in Appendix A. DOE led an extensive, open, public input process and heard a wide range of comments and recommendations that have all been considered.1 More than 150 participants registered for three public workshops held in Detroit, MI (September 24, 2001); Atlanta, GA (September 26, 2001); and Phoenix, AZ (September 28, 2001).

  15. Wireless data signal transmission system

    DEFF Research Database (Denmark)

    2014-01-01

    The present invention relates to a method for providing a radio frequency signal for transmission, a system for providing a radio frequency signal for transmission and a method for wireless data transmission between a transmitter and a receiver.......The present invention relates to a method for providing a radio frequency signal for transmission, a system for providing a radio frequency signal for transmission and a method for wireless data transmission between a transmitter and a receiver....

  16. Correlaciones entre Pesos Vivos y Medidas Corporales del Ganado Blanco-Orejinegro a Diferentes Edades

    Directory of Open Access Journals (Sweden)

    Arboleda A. Oscar

    1979-12-01

    Full Text Available El ganado Blanco Orejinegro ofrece condiciones fisiológicas admirables para adaptarse a terrenos pobres y quebrados de nuestro medio, sobrevivir y reproducirse hasta una edad avanzada. Es por ello que presenta considerable ventaja para cruzamientos por cuanto posee cualidades de baja heredabilidad, que responden en forma óptima a heterosis; las cuales combinadas con otras características económicas deseables, aportadas por la otra raza constituyente del cruce, dan un híbrido de muchas ventajas para el productor comercial. El ganado BON ha sido manejado durante muchos años solo con fines de conservación y multiplicación, sin parámetros definidos de selección. Por lo tanto, el presente trabajo ha pretendido estudiar ciertas medidas corporales y su relación con pesos a diferentes edades, para así establecer constantes para la raza y curvas de crecimiento que sirvan de modelo y base de comparación con otras razas criollas colombianas.

  17. Índices de seguridad de voltaje calculados con datos de unidades fasoriales de medida

    Directory of Open Access Journals (Sweden)

    Carlos J. Zapata

    2009-11-01

    Full Text Available Las unidades de medida fasorial son un recurso tecnológico que permite observar con gran precisión el estado dinámico del sistema eléctrico de potencia. Su aplicación permite, entre muchas otras cosas, implementar índices para evaluar en tiempo real la seguridad de voltaje. Este artículo presenta una breve historia del desarrollo de estos índices y una propuesta inicial de escalas semánticas - gráficas para tres de ellos, con el fin de expresar en forma cualitativa al operador del centro de control el estado de la seguridad de voltaje del sistema./ Phasor measurement units are a technological resource that allows observing with great accuracy the dynamic state of the electric power system. Its application allows, among many things, the implementation of indexes for the on line assessment of voltage security. This paper presents a brief review on the development of these indexes and the results of a study on the establishment semantic - graphic scales for three of them which express to the control center operator in a qualitative way the state of system voltage security

  18. Validación de la Escala CISNEROS de Medida de Mobbing al Gallego

    Directory of Open Access Journals (Sweden)

    M.ª Ángeles López-Cabarcos

    2009-01-01

    Full Text Available El objetivo del trabajo es la validación de la escala CISNEROS de medida de mobbing en gallego, formada por 43 ítems que miden la frecuencia de mobbing a través de una escala de 7 puntos, al tiempo que permite identificar a los posibles responsables del mismo. Para ello se llevó a cabo un análisis factorial exploratorio y un análisis factorial confirmatorio en una muestra multisectorial representativa de la población activa de Galicia. Los resultados del análisis factorial exploratorio indican la existencia de cinco factores principales que explican el 60,31% de la varianza total y muestran una elevada fiabilidad de la escala (alfa=.96. Posteriormente, se compara el ajuste de tres modelos mediante análisis factorial confirmatorio. Los resultados indican que el modelo de cinco factores correlacionados es el que mejor se ajusta a los datos, dando así apoyo empírico a la estructura de cinco factores obtenida en el análisis factorial exploratorio.

  19. Obtención de una medida del consumo nacional de comidas.

    Directory of Open Access Journals (Sweden)

    Álvarez Martínez, Pedro

    2004-01-01

    Full Text Available En España el gasto de alimentos representa un alto porcentaje del total de presupuesto de los hogares. El presupuesto se reparte como sigue: carne (29%, frutas, legumbres, veduras y patatas (19%, productos lácteos, huevos y quesos (14%, pan y cereales (13%, pescado (13%, grasas y aceites (4%, otros alimentos (8%. El consumo de alimentos está afectado no solo por factores económicos sino también por hábitos, gustos, antecedentes culturales y forma de vida. Por tanto un importante un objetivo importante para los investigadores es medir la importancia relativa de estos factores, y cuales de ellos determinan la preferencia. Estas preferencias son diferentes para gente que viven en ciudades de distintas población. Este hecho es debido a diferentes antecedentes culturales, factores sociales, y cambios de sistemas de distribución. El objetivo de este trabajo es aplicar una nueva metodología que nos permita obtener una medida de las preferencias en el consumo de los alimentos conociendo solo la cantidad de dinero semanal que los hogares gastan en cada una de los alimentos, y detectar así posibles hábitos de consumo.

  20. Modelo de medida del estado de ánimo subjetivo en deportistas adolescentes

    Directory of Open Access Journals (Sweden)

    Elena Andrade

    2011-01-01

    Full Text Available El presente estudio se diseñó para obtener evidencias internas de validez de una versión en español del cuestionario de estado de ánimo POMS (Profile of Mood States para adolescentes. Dicha versión fue previamente construida con ítems seleccionados mediante escalamiento de objetos (Andrade, Arce, Armental, Rodríguez, y De Francisco, 2008. Participaron en el estudio 320 deportistas adolescentes, 194 varones y 126 mujeres, con una media de edad de 14.95 (DE = 1.29. Se empleó análisis factorial confirmatorio para verificar la congruencia entre los datos y el modelo propuesto. Así se comprobó que el mejor ajustado era un modelo de medida con 29 ítems y 6 factores de primer orden: Tensión, Estado Deprimido, Cólera, Vigor, Fatiga y Amistad. Los resultados para los indicadores más habituales de ajuste global fueron: c2 (361 = 684.25 (p < .01, CFI = .96, NNFI = .96, RMSEA = .053 (con valores de .047 y de .059 para los límites mínimo y máximo del intervalo de confianza al 90%, y SRMR = .061.

  1. El fracaso escolar y los enfoques de aprendizaje: medidas para la inclusión educativa

    Directory of Open Access Journals (Sweden)

    Ana Belén Mirete Ruiz

    2015-01-01

    Full Text Available El índice de fracaso escolar existente actualmente en España resulta muy preocupante a pesar de las numerosas reformas educativas que se han llevado a cabo en los últimos años. Para analizar los factores motivacionales y de estrategias de aprendizaje que pueden estar incidiendo en la calidad del aprendizaje de los estudiantes se ha realizado una investigación con 281 estudiantes de Educación Secundaria Obligatoria a los que se ha aplicado el Cuestionario sobre Procesos de Aprendizaje (CPA. También se les ha planteado una serie de cuestiones sobre aspectos relacionados con la inclusión, los factores que pueden estar influyendo en el fracaso escolar y las medidas de mejora del rendimiento académico aplicadas por los estudiantes según sus enfoques de aprendizaje. Con ello se ha podido identificar las características de los aprendizajes de este grupo de estudiantes y se han planteado una serie de propuestas de mejora que de ser aplicadas podrían repercutir en la calidad de sus aprendizajes, en la mejora de su rendimiento académico y en minimizar los nefastos efectos del fracaso escolar en este nivel educativo.

  2. Algunos aspectos socio-culturales, didácticos y matemáticos al abordarla conceptualización de la medida

    OpenAIRE

    Camargo, Sandra; Castro, Yency

    2004-01-01

    Mostraremos, desde una mirada socio-cultural, didáctica y matemática, algunos aspectos que intervienen en la conceptualización de la medida y que podrían contribuir a enriquecer la fundamentación de procesos y desarrollo de competencias al abordar la medida en la escuela.

  3. Transmission Efficiency of the Sage Spectrometer Using GEANT4

    Science.gov (United States)

    Cox, D. M.; Herzberg, R.-D.; Papadakis, P.; Ali, F.; Butler, P. A.; Cresswell, J. R.; Mistry, A.; Sampson, J.; Seddon, D. A.; Thornhill, J.; Wells, D.; Konki, J.; Greenlees, P. T.; Rahkila, P.; Pakarinen, J.; Sandzelius, M.; Sorri, J.; Julin, R.; Coleman-Smith, P. J.; Lazarus, I. H.; Letts, S. C.; Simpson, J.; Pucknell, V. F. E.

    2014-09-01

    The new SAGE spectrometer allows simultaneous electron and γ-ray in-beam studies of heavy nuclei. A comprehensive GEANT4 simulation suite has been created for the SAGE spectrometer. This includes both the silicon detectors for electron detection and the germanium detectors for γ-ray detection. The simulation can be used for a wide variety of tests with the aim of better understanding the behaviour of SAGE. A number of aspects of electron transmission are presented here.

  4. Experimental system for high resolution X-ray transmission radiography

    Czech Academy of Sciences Publication Activity Database

    Jakůbek, J.; Holý, T.; Jakůbek, M.; Vavřík, Daniel; Vykydal, Z.

    Volume 563, č. 1 (2006), s. 278-281 ISSN 0168-9002. [Intern. Workshop on Radiation Imaging Detectors /7./. Grenoble, 04.07.2005-07.07.2005] R&D Projects: GA MŠk(CZ) 1P04LA211; GA ČR(CZ) GA106/04/0567 Institutional research plan: CEZ:AV0Z20710524 Keywords : digital radiography * beam hardening * mikroradiography * roentgenogram quality Subject RIV: JB - Sensors, Measurment, Regulation Impact factor: 1.185, year: 2006

  5. Altura do joelho como medida alternativa confiável na avaliação nutricional de idosos

    Directory of Open Access Journals (Sweden)

    Vera Elizabeth CLOSS

    2015-10-01

    Full Text Available Objetivo:Avaliar o uso da altura do joelho como medida alternativa confiável na avaliação nutricional de idosos atendidos em um ambulatório de geriatria.Métodos:Estudo transversal com idosos atendidos em ambulatório de geriatria de um hospital universitário, entre novembro de 2009 e novembro de 2010. Variáveis investigadas: gênero, idade, peso, estatura, altura do joelho, estatura estimada através das equações de Chumlea, índice de massa corporal para as medidas de estatura aferida e estimada e classificado segundo Lipschitz, e dados sociodemográficos. Na análise descritiva dos dados foram usadas medidas de tendência central, dispersão e proporção; a homogeneidade entre as medidas foi verificada através do coeficiente de correlação intraclasse e do gráfico de Bland e Altman e a concordância entre a avaliação nutricional baseada no índice de massa corporal calculado a partir da estatura aferida e a avaliação nutricional baseada no índice de massa corporal calculado a partir da estatura estimada foi avaliada através do coeficiente Kappa ponderado com pesos quadráticos.Resultados:Foram avaliados 186 idosos com média de idade de 74,3±7,1 anos. A média do índice de massa corporal aferido e estimado foi 28,96±5,86 kg/m2e 27,95±5,47 kg/m2, respectivamente, e a prevalência de sobrepeso foi de 59,7% para o índice de massa corporal aferido e 53,2% para o estimado. Foi observada uma boa concordância (Kappa=0,79; p<0,001 entre as duas avaliações.Conclusão:Os resultados mostraram ser possível utilizar a altura do joelho na estimativa da estatura para cálculo do índice de massa corporal em idosos atendidos em ambulatório, alternativa útil para aqueles que apresentam limitações na aferição das medidas, sendo esta uma medida alternativa importante na avaliação nutricional de idosos.

  6. Small passenger car transmission test: Mercury Lynx ATX transmission

    Science.gov (United States)

    Bujold, M. P.

    1981-01-01

    The testing of a Mercury Lynx automatic transmission is reported. The transmission was tested in accordance with a passenger car automatic transmission test code (SAE J65lb) which required drive performance, coast performance, and no load test conditions. Under these conditions, the transmission attained maximum efficiencies in the mid-ninety percent range both for drive performance test and coast performance tests. The torque, speed, and efficiency curves are presented, which provide the complete performance characteristics for the Mercury Lynx automatic transmission.

  7. Small passenger car transmission test: Dodge Omni A-404 transmission

    Science.gov (United States)

    Bujold, M. P.

    1980-01-01

    The small passenger car transmission test was initiated to supply electric vehicle manufacturers with technical information regarding the performance of commercially available transmissions. This transmission was tested in accordance with a passenger car automatic transmission test code (SAE J65lb) which required drive performance, coast performance, and no load test conditions. Under these test conditions, the transmission attained maximum efficiencies in the mid eighty percent range for both drive performance test and coast performance tests.

  8. Analysis of thermally loaded transmissive optical elements

    Science.gov (United States)

    Michels, Gregory J.; Genberg, Victor L.

    2013-09-01

    The performance metrics of many optical systems are affected by temperature changes in the system through different physical phenomena. Temperature changes cause materials to expand and contract causing deformations of optical components. The resulting stress states in transmissive optics can cause refractive changes that can affect optical performance. In addition, the temperature changes themselves can cause changes in the refractive properties of transmissive optics. Complex distributions of refractive indices that relate to the thermal profile, the thermo-optic refractive index profile, within the optical media can be predicted by the finite element method. One current technique for representing such refractive index profiles is through the generation of optical path difference (OPD) maps by integration along integration paths. While computationally efficient, this method has limitations in its ability to represent the effect of the index changes for rays associated with multiple field points and multiple wavelengths. A more complete representation of the thermo-optic refractive index profile may be passed to the optical analysis software through the use of a user defined gradient index material. The interface consists of a dynamic link library (DLL) which supplies indices of refraction to a user defined gradient index lens as ray tracing calculations are being performed. The DLL obtains its refractive index description from a database derived from the thermal analysis of the optics. This process allows optical analysis software to perform accurate ray tracing for an arbitrary refractive index profile induced by changes in temperature.

  9. Probabilistic transmission system planning

    CERN Document Server

    Li, Wenyuan

    2011-01-01

    "The book is composed of 12 chapters and three appendices, and can be divided into four parts. The first part includes Chapters 2 to 7, which discuss the concepts, models, methods and data in probabilistic transmission planning. The second part, Chapters 8 to 11, addresses four essential issues in probabilistic transmission planning applications using actual utility systems as examples. Chapter 12, as the third part, focuses on a special issue, i.e. how to deal with uncertainty of data in probabilistic transmission planning. The fourth part consists of three appendices, which provide the basic knowledge in mathematics for probabilistic planning. Please refer to the attached table of contents which is given in a very detailed manner"--

  10. Aerosol Transmission of Filoviruses

    Directory of Open Access Journals (Sweden)

    Berhanu Mekibib

    2016-05-01

    Full Text Available Filoviruses have become a worldwide public health concern because of their potential for introductions into non-endemic countries through international travel and the international transport of infected animals or animal products. Since it was first identified in 1976, in the Democratic Republic of Congo (formerly Zaire and Sudan, the 2013–2015 western African Ebola virus disease (EVD outbreak is the largest, both by number of cases and geographical extension, and deadliest, recorded so far in medical history. The source of ebolaviruses for human index case(s in most outbreaks is presumptively associated with handling of bush meat or contact with fruit bats. Transmission among humans occurs easily when a person comes in contact with contaminated body fluids of patients, but our understanding of other transmission routes is still fragmentary. This review deals with the controversial issue of aerosol transmission of filoviruses.

  11. Aerosol Transmission of Filoviruses.

    Science.gov (United States)

    Mekibib, Berhanu; Ariën, Kevin K

    2016-05-23

    Filoviruses have become a worldwide public health concern because of their potential for introductions into non-endemic countries through international travel and the international transport of infected animals or animal products. Since it was first identified in 1976, in the Democratic Republic of Congo (formerly Zaire) and Sudan, the 2013-2015 western African Ebola virus disease (EVD) outbreak is the largest, both by number of cases and geographical extension, and deadliest, recorded so far in medical history. The source of ebolaviruses for human index case(s) in most outbreaks is presumptively associated with handling of bush meat or contact with fruit bats. Transmission among humans occurs easily when a person comes in contact with contaminated body fluids of patients, but our understanding of other transmission routes is still fragmentary. This review deals with the controversial issue of aerosol transmission of filoviruses.

  12. Transmission positron microscopes

    Energy Technology Data Exchange (ETDEWEB)

    Doyama, Masao [Teikyo University of Science and Technology, Uenohara, Yamanashi 409-0193 (Japan)]. E-mail: doyama@ntu.ac.jp; Kogure, Yoshiaki [Teikyo University of Science and Technology, Uenohara, Yamanashi 409-0193 (Japan); Inoue, Miyoshi [Teikyo University of Science and Technology, Uenohara, Yamanashi 409-0193 (Japan); Kurihara, Toshikazu [Institute of Materials Structure Science (IMSS), High Energy Accelerator, Research Organization (KEK), Ohno 1-1, Tsukuba, Ibaraki 305-0801 (Japan); Yoshiie, Toshimasa [Reactor Research Institute, Kyoto University, Noda, Kumatori, Osaka 590-0451 (Japan); Oshima, Ryuichiro [Research Institute for Advanced Science and Technology, Osaka Prefecture University (Japan); Matsuya, Miyuki [Electron Optics Laboratory (JEOL) Ltd., Musashino 3-1-2, Akishima 196-0021 (Japan)

    2006-02-28

    Immediate and near-future plans for transmission positron microscopes being built at KEK, Tsukuba, Japan, are described. The characteristic feature of this project is remolding a commercial electron microscope to a positron microscope. A point source of electrons kept at a negative high voltage is changed to a point source of positrons kept at a high positive voltage. Positional resolution of transmission microscopes should be theoretically the same as electron microscopes. Positron microscopes utilizing trapping of positrons have always positional ambiguity due to the diffusion of positrons.

  13. Transmission grid security

    CERN Document Server

    Haarla, Liisa; Hirvonen, Ritva; Labeau, Pierre-Etienne

    2011-01-01

    In response to the growing importance of power system security and reliability, ""Transmission Grid Security"" proposes a systematic and probabilistic approach for transmission grid security analysis. The analysis presented uses probabilistic safety assessment (PSA) and takes into account the power system dynamics after severe faults. In the method shown in this book the power system states (stable, not stable, system breakdown, etc.) are connected with the substation reliability model. In this way it is possible to: estimate the system-wide consequences of grid faults; identify a chain of eve

  14. Método para estimar o tamanho amostral em análises de medidas repetidas

    Directory of Open Access Journals (Sweden)

    FREITAS ALFREDO RIBEIRO DE

    2000-01-01

    Full Text Available O objetivo do trabalho foi avaliar um método para estimar o número de indivíduos (n a ser utilizado em experimentos que envolvam análises multivariadas de medidas repetidas no tempo, avaliadas sobre a mesma unidade experimental. O método foi testado com dados de produção de leite com 10 controles mensais (t = 1, 2, ... , 10 ou condições de avaliação de vacas da raça Holandesa. As estimativas de n foram obtidas por meio de um programa desenvolvido no Statistical Analysis System (SAS, considerando distribuição normal t variada, vetor de média zero e matriz de covariância sigma, estatística T² de Hotelling e distribuição F com parâmetro de não-centralidade delta²delta. A ligação dos dados observados com o método é feita por meio da matriz de variância-covariância. Para t > 2 condições de avaliação, o método estima o valor de n que permite detectar diferença mínima significativa (delta entre médias de condições de avaliação, considerando diferentes níveis de erros do tipo I (alfa, poder do teste F (1-beta e delta. Para as 10 condições de avaliação consideradas, as estimativas de n variaram de 11 a 89, sendo mais influenciadas por variações na delta, seguidas de alfa e beta.

  15. Printed circuit dispersive transmission line

    Science.gov (United States)

    Ikezi, Hiroyuki; Lin-Liu, Yuh-Ren; DeGrassie, John S.

    1991-01-01

    A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other.

  16. DETERMINANTES DE LA DECISIÓN DE LOS MOTOTAXISTAS EN CARTAGENA (COLOMBIA DE INFRINGIR LA MEDIDA DE PICO Y PLACA

    Directory of Open Access Journals (Sweden)

    MARTHA YÁNEZ CONTRERAS

    2014-01-01

    Full Text Available El mototaxismo es un tipo de transporte público informal que se ha tratado de controlar en la ciu - dad de Cartagena (Colombia con regulaciones como la medida de pico y placa. No obstante, esta regulación registra una alta tasa de infracción (cerca del 69% de los mototaxistas la infringen. En este documento se estiman modelos de elección binaria en los que se buscan examinar los factores que hacen más propenso a un mototaxista a infringir la regulación. Los resultados muestran que los determinantes más robustos son el número de motocicletas para trabajar y la ganancia esperada. Se concluye que la medida ha incentivado el uso de por lo menos una motocicleta adicional.

  17. Comprensión de medidas de dispersión: caso de la licenciatura en psicología

    OpenAIRE

    Espinosa, María Magdalena

    2006-01-01

    Con la aplicación de un mismo cuestionario antes y después de la enseñanza de las medidas de dispersión, se pretende identificar cambios y constantes en las respuestas de los estudiantes a las preguntas que plantea, sobre la base de la caracterización de tipos de conocimiento de un concepto, propuesta por Pollatsek et al (1981). El interés está dirigido al estudio de su comprensión de las medidas de dispersión, en particular el rango, la desviación media absoluta, la desviación estándar y la ...

  18. Scanning transmission electron microscope

    NARCIS (Netherlands)

    Kruit, P.

    2006-01-01

    The invention relates to a scanning transmission electron microscope comprising an electron source, an electron accelerator and deflection means for directing electrons emitted by the electron source at an object to be examined, and in addition a detector for detecting electrons coming from the

  19. 4. CRIMINALISING HIV TRANSMISSION

    African Journals Online (AJOL)

    Esem

    are no well-founded evidences that criminalization of. HIV transmission ... A combination of effective evidence-based approaches should be adopted ... the globe. In doing so literature on various laws and issues surrounding the discussion topics were reviewed. Based. Medical Journal of Zambia, Vol. 41, No. 3: 121 - 1126 ...

  20. Intergenerational Transmission of Volunteering

    NARCIS (Netherlands)

    Bekkers, René

    2007-01-01

    In this article, I investigate the strength of intergenerational transmission of volunteering for non-profit associations in The Netherlands. Data from the Family Survey of the Dutch Population 2000 reveal that there are significant relations between current volunteering and parental volunteering in

  1. Drivers of Tuberculosis Transmission

    NARCIS (Netherlands)

    Mathema, Barun; Andrews, Jason R.; Cohen, Ted; Borgdorff, Martien W.; Behr, Marcel; Glynn, Judith R.; Rustomjee, Roxana; Silk, Benjamin J.; Wood, Robin

    2017-01-01

    Measuring tuberculosis transmission is exceedingly difficult, given the remarkable variability in the timing of clinical disease after Mycobacterium tuberculosis infection; incident disease can result from either a recent (ie, weeks to months) or a remote (ie, several years to decades) infection

  2. Intergenerational Transmission of Preferences

    NARCIS (Netherlands)

    Bulte, E.H.; Horan, R.D.

    2011-01-01

    We propose a perfect empathy model of cultural transmission to capture the evolution of preferences in a population. Unlike existing imperfect empathy models, focusing on stable interior equilibria, we demonstrate that a corner outcome will eventuate. However, which corner outcome emerges is

  3. Design of transmission shafting

    Science.gov (United States)

    Loewenthal, S. H.

    1978-01-01

    Formula considers flexure fatigue characteristics of shaft material under combined cyclic bending and static torsion stress. Formula permits selecting shaft sizes that meet common loading conditions without adding on excessive shaft material. Formula is applicable to design of rotary power or torque transmission shafting external to machine elements.

  4. Automatic transmission line monitor

    Science.gov (United States)

    Parsons, W. E.; Richards, L. O.

    1971-01-01

    Monitor improves complex network reliability in computer data links and command transmission lines. System evaluates circuit performance against preselected criteria, identifies and stores data indicating out-of-tolerance conditions, conducts closed loop testing, and provides for operation under command of digital computer that determines restoration priorities.

  5. 4. CRIMINALISING HIV TRANSMISSION

    African Journals Online (AJOL)

    Esem

    ABSTRACT. Objective: This paper attempts to summarise the global state with regard to the criminalisation of Human. Immunodeficiency Virus (HIV) transmission. Method: A comprehensive analysis of both global and. Zambianpublications, legislation and case laws was conducted. Results: Proponents of criminalisation of ...

  6. Preferencias de estados de salud y medidas de utilidad = Preferences of states of health and measurements of utility

    Directory of Open Access Journals (Sweden)

    Yepes-Nuñez, Juan José

    2011-12-01

    Full Text Available La medición de los valores del estado de salud, preferencias y utilidad calcula el valor o la conveniencia de un estado de salud contra un instrumento externo; son medidas genéricas de la calidad de vida relacionada con la salud (CVRS y resumen el valor de esta en un solo número entre 0 (cero y 1 (uno. Las medidas de preferencias de estados de salud y de utilidad difieren de las medidas generales y específicas obtenidas mediante cuestionarios de CVRS en áreas importantes. Primero, calculan las predilecciones de los individuos por alternativas. Segundo, proveen un resultado completo de la CVRS. Tercero, ofrecen una unidad común de análisis. Existen dos métodos para la medición de las utilidades, uno directo y otro indirecto, que se conocen también como utilidades multiatributo o sistemas de clasificación de estados de salud. El proceso directo de medición consiste en un agregado de descripciones que un entrevistador presenta a los encuestados. Para las mediciones indirectas se aplican solamente cuestionarios. El objetivo principal de este artículo es describir los principales métodos de valoración de utilidades, con el fin de dar a conocer los desenlaces que actualmente se utilizan tanto en estudios de CVRS como en evaluaciones económicas.

  7. Medidas de protección del menor en los casos de violencia de género

    Directory of Open Access Journals (Sweden)

    Francisca Ramón Fernández

    2013-04-01

    Full Text Available En el presente trabajo nos proponemos realizar un análisis de los distintos preceptos que contemplan las medidas de protección del menor en los casos de violencia de género, tanto en la legislación internacional, estatal y autonómica. El menor como sujeto, directo o indirecto, de la violencia sobre la mujer es protegido a través de una serie de medidas y reconocimiento de derechos, que es más amplio en una legislación que en otra de las estudiadas. Sería conveniente una uniformidad sobre esa protección al menor, ya que en la mayoría de las veces sufre esa violencia en el entorno familiar. La reflexión del análisis de los preceptos nos indica que es el interés superior del menor el que tiene que prevalecer en todas las situaciones, y que, en muchas ocasiones, la legislación no dota de suficientes medidas de protección al menor que se encuentra en una situación de violencia doméstica.

  8. Nivel de conocimiento y aplicación de las medidas de bioseguridad del personal de enfermería

    Directory of Open Access Journals (Sweden)

    Luz Marina Bautista-Rodríguez

    2013-12-01

    Full Text Available Objetivo. Identificar el nivel de conocimiento y aplicación de las medidas de bioseguridad que tiene el personal de Enfermería. Materiales y Métodos. Se realizó investigación cuantitativa, de tipo descriptivo transversal, con una muestra de 96 personas pertenecientes. La información se recolectó a través de una encuesta y una lista de chequeo, la cual se analizó por medio de tabulaciones y representaciones gráficas. Resultados. El personal de Enfermería de la Clínica San José tiene un conocimiento regular en un 66% frente a las medidas de bioseguridad y un 70% de aplicación deficiente frente a estas. Conclusión. Se identificó que las principales medidas de bioseguridad, como métodos de barrera, eliminación adecuada del material contaminado, manejo adecuado de los elementos cortopunzante, lavado de manos no están siendo aplicadas correctamente por el personal de Enfermería de la institución, convirtiéndose estas situaciones en un factor de riesgo para el presentar un accidente laboral esta población.

  9. Effect of screening of immigrants on tuberculosis transmission

    NARCIS (Netherlands)

    Verver, S.; van Soolingen, D.; Borgdorff, M. W.

    2002-01-01

    SETTING: In The Netherlands all immigrants from highly endemic countries undergo obligatory entry screening by X-ray, followed by voluntary half-yearly screening for 2 years. OBJECTIVE: To estimate the contribution of screening of immigrants to reductions in tuberculosis transmission. DESIGN: All

  10. An experimental method for ripple minimization in transmission data ...

    Indian Academy of Sciences (India)

    An experimental method for ripple minimization in transmission data for industrial X-ray computed tomography imaging system ... This emanates from the fact that in a computed tomographic imaging system, statistical variation inherent in the penetrating radiation used to probe the specimen, electronic noise generated in ...

  11. X-ray optics of tapered capillaries.

    Science.gov (United States)

    Balaic, D X; Nugent, K A

    1995-11-01

    The optics of x-ray concentration by tapered glass capillaries is analyzed in terms of a phase-space construction describing their transmission efficiency. The parameters defining the intensity gain are given in terms of parameters describing the x-ray source used, the capillary taper profile, and glass characteristics. We introduce some key concepts in understanding these devices: the extreme ray and a phase-space description of sources and optics. They are used to develop an analytical formulation for the optimum gain characteristics of generalized tapers for use with synchrotrons and other low-divergence sources. This general solution is solved further for the case of conical taper profile. The predictions of this theory are compared with the results of three-dimensional, ray-tracing simulations of x-ray concentration efficiency for conical and paraboloidal tapers.

  12. Infrared Radiography: Modeling X-ray Imaging without Harmful Radiation

    Science.gov (United States)

    Zietz, Otto; Mylott, Elliot; Widenhorn, Ralf

    2015-01-01

    Planar x-ray imaging is a ubiquitous diagnostic tool and is routinely performed to diagnose conditions as varied as bone fractures and pneumonia. The underlying principle is that the varying attenuation coefficients of air, water, tissue, bone, or metal implants within the body result in non-uniform transmission of x-ray radiation. Through the…

  13. Diseño e Implementación de Instrumentos Electrónicos de Medida con Herramientas Hardware y Software Arduino

    OpenAIRE

    Velázquez Díaz, Oliver

    2014-01-01

    En este trabajo se va a estudiar la posible sustitución de instrumentos electrónicos de medida físicos por instrumentos electrónicos de medida virtuales en laboratorios tanto docentes como de investigación. Para crear estos instrumentos electrónicos de medida virtuales se van a utilizar herramientas de hardware (Arduino) y software (Labview). Se diseñan desde equipos básicos como multímetros, hasta sistemas más complejos como osciloscopios. Tras diseñar estos instrumentos, se procederá a vali...

  14. Medidas de frecuencia, asociación e impacto en investigación aplicada

    Directory of Open Access Journals (Sweden)

    J.A. Mirón Canelo

    2008-06-01

    Full Text Available En la Sociedad actual del conocimiento y la información es preciso disponer de herramientas básicas para medir los fenómenos epidemiológicos como la enfermedad, la incapacidad o la siniestralidad laboral. Las formas de medir son instrumentos que se deben conocer y aplicar para planificar y tomar decisiones en Salud Pública y en Salud Laboral. El objetivo de este artículo es dar a conocer las principales medidas de frecuencia, asociación e impacto utilizadas en investigación aplicada, clínica o de Salud Pública para tratar de medir, valorar y estimar la importancia de los problemas de salud y enfermedades de relacionadas con el trabajo, de los factores de riesgo ocupacionales y otros eventos relacionados con la seguridad e higiene en el trabajo y, en definitiva, con la Salud de los trabajadores. Se describen los conceptos teóricos de las formas de medir en epidemiología, su interpretación y aplicación práctica de los indicadores básicos utilizados en la práctica habitual de los profesionales de las Ciencias de la Salud. Su utilidad fundamental es poder disponer de una información objetiva, fiable y precisa que permita tomar decisiones adecuadas y pertinentes en relación con la prevención, seguridad laboral, atención y rehabilitación de los trabajadores.In the society´current knowledge and information is necessary to have basic tools to measure the epidemic phenomena such as illness, disability or workplace accidents. The ways of measuring are instruments that they must know and apply to plan and take decisions on Public Health and Labour/Occupational Health. The aim of this article is to inform about the most important measures of frequency, association and impact used in applied research, clinical or Public Health to try to measure, to value and estimate the importance of health problems and diseases related work. The occupational risk factors and other events related to safety and healthy working conditions and ultimately

  15. Ciberactivismo: conceptualización, hipótesis y medida

    Directory of Open Access Journals (Sweden)

    Fernández Prados, Juan Sebastián

    2012-08-01

    Full Text Available Cyberactivism has emerged as a transposition of unconventional political action to the context of information and communication technologies. This phenomenon raises at least three questions. The first is the definition, delineation and classification of the concept. The second is that of the theoretical perspectives from which to answer questions such as: does the emergence of ICTs in the public sphere enhance civic culture or not? This question led to Pippa Norris to distinguish between mobilization theories and theories of reinforcement. Finally, there is a need to design tools and studies with which to attempt to evaluate and measure the phenomenon, as proposed by the biannual study entitled The Internet in Britain and in the work of the University of Southern California through the Center for the Digital Future. Following this review, we develop a new definition of cyberactivism and propose some instrument to measure the phenomenon.

    La emergencia del ciberactivismo como una traslación de la acción política no convencional en el contexto de las tecnologías de la información y la comunicación plantea al menos tres cuestiones. La definición, delimitación y clasificación del mismo concepto. El segundo aspecto que suscita el ciberactivismo es de carácter teórico al plantear las siguientes perspectivas antitéticas: ¿Provoca o no la aparición de las TIC en la esfera política un aumento de la cultura cívica? Pregunta que lleva a Pippa Norris a distinguir entre las teorías de la movilización y las teorías del refuerzo. Finalmente, surge la necesidad de diseñar instrumentos y estudios que procuran en parte una evaluación y medida del fenómeno del ciberactivismo tal y como lo lleva a cabo el estudio bianual The Internet in Britain o los trabajos de la Universidad del Sur de California a través del Center for the Digital Future. Tras esta revisión, desarrollaremos propuestas conceptuales y metodológicas para medir

  16. Administrando soluciones posibles: medidas judiciales de protección de la niñez

    Directory of Open Access Journals (Sweden)

    Carolina Ciordia

    2011-06-01

    Full Text Available El objetivo de este artículo es indagar los modos a través de los cuales el ámbito judicial desarrolla diferentes intervenciones que teniendo como meta explícita la "protección" de niños y niñas, se orientan también a administrar y normalizar sus familias. Para ello focalizamos nuestro análisis en expedientes judiciales relevados en un tribunal de menores y en un juzgado de familia, con el fin de describir las resoluciones y medidas dictadas, y de analizar la trama de relaciones y las interacciones producidas entre los agentes judiciales, administrativos y los familiares de los niños, ya que a partir de ellas se configuran y postulan distintas soluciones posibles. Con este repertorio de soluciones, que serán ofrecidas o impuestas y que variarán a lo largo del proceso judicial, se busca componer un "orden familiar", ya sea preservando el vínculo de los niños con su familia de origen o bien encaminándolos hacia la adopción.The objective of this article is to inquire about the ways through which the judiciary develops different interventions that, taking as explicit goal the "protection" of boys and girls, are also oriented at administering and normalizing their families. To such end, we focused our analysis on court records reviewed at a juvenile and family court, with the purpose of describing the resolutions and measures adopted, and of analyzing the scheme of relationships and interactions produced between the court clerks, administrative agents and the children's relatives, given that it is from them that we can configure and outline the different possible solutions. Collection of solutions that will be offered or imposed and that will vary throughout the judicial process, with which the formation of a "family order" is sought, either by preserving the relationship of the children with their family of origin or by orienting them towards adoption.

  17. Fatores de risco e medidas preventivas das infecções associadas a cateteres venosos centrais

    Directory of Open Access Journals (Sweden)

    Viviane Rosado

    2011-12-01

    Full Text Available OBJETIVO: Rever os fatores de risco para infecção associada a cateteres venosos centrais e as recomendações para a sua prevenção. FONTES DOS DADOS: Foram revisados artigos publicados sobre o tema no PubMed, Cochrane Collaboration e Bireme. Os seguintes critérios de inclusão foram levados em consideração: trabalhos publicados entre 2000 e 2010, delineamento do estudo, população pediátrica hospitalizada com utilização de cateteres venosos centrais e artigos sobre infecção associada a cateteres venosos centrais. Além disso, foram utilizados documentos de referência dos Centers for Disease Control and Prevention e da Agência Nacional de Vigilância Sanitária. SÍNTESE DOS DADOS: Os fatores de risco associados foram: tempo de utilização de acesso central, duração da internação e uso de cateter central de longa permanência, colocação de cateter venoso central em Unidade de Terapia Intensiva, doença cardiovascular não cirúrgica, recebimento de nutrição parenteral e de transfusão de hemoderivados. Entre as medidas preventivas, a literatura recomenda a implementação de protocolos e diretrizes multidisciplinares de cuidados na inserção e manutenção dos cateteres centrais, cuidados com a técnica de inserção dos cateteres venosos centrais, utilização de curativos impregnados com clorexidina, retirada precoce do cateter e adoção de programas de educação continuada para a equipe assistencial. CONCLUSÃO: O controle dos fatores de risco pode levar a uma redução igual ou superior a 40% na incidência dessas infecções. A vigilância do processo de inserção e cuidados com os cateteres vasculares centrais na população pediátrica orienta a padronização de rotinas dos serviços de saúde para a obtenção de taxas de referência para comparação intra e interinstitucionais.

  18. Uniformity and transmission of proportional counter window materials for use with AXAF

    Science.gov (United States)

    Flanagan, K.; Austin, G. K.; Cobuzzi, J. P.; Goddard, R.; Hughes, J. P.; Mclaughlin, E. R.; Podgorski, W. A.; Rose, V.; Roy, A. G.; Zombeck, M. V.

    1991-01-01

    The X-ray detection system used to calibrate the Advanced X-ray Astrophysics Facility (AXAF) mirrors will include gas flow and sealed proportional counters. To meet the ultimate 1 percent goal of the calibration project, the transmission and uniformity of the windows must be well known for the soft X-ray wavelengths involved. Various window materials for use with proportional counters are examined for transmission at X-ray wavelengths in the range of 0.1 to 5.9 keV. These include the usual window materials (polypropylene and beryllium), as well as materials only recently employed for detector applications (polyimide and diamond). The transmission uniformity of beryllium at 1.49 keV is examined with a microchannel plate detector, producing a 'shadowgraph' of the window material illuminated with soft X-rays. This technique allows us to investigate nonuniformities on a spatial scale of about .2 mm.

  19. Small passenger car transmission test; Ford C4 transmission

    Science.gov (United States)

    Bujold, M. P.

    1980-01-01

    A 1979 Ford C4 automatic transmission was tested per a passenger car automatic transmission test code (SAE J651b) which required drive performance, coast performance, and no load test conditions. Under these test conditions, the transmission attained maximum efficiencies in the mid-eighty percent range for both drive performance tests and coast performance tests. The major results of this test (torque, speed, and efficiency curves) are presented. Graphs map the complete performance characteristics for the Ford C4 transmission.

  20. Small passenger car transmission test; Chevrolet LUV transmission

    Science.gov (United States)

    Bujold, M. P.

    1980-01-01

    A 1978 Chevrolet LUV manual transmission tested per the applicable portions of a passenger car automatic transmission test code (SAE J65lb) which required drive performance, coast performance, and no load test conditions. Under these test conditions, the transmission attained maximum efficiencies in the upper ninety percent range for both drive performance tests and coast performance tests. The major results of this test (torque, speed, and efficiency curves) are presented. Graphs map the complete performance characteristics for the Chevrolet LUV transmission.

  1. Data transmission networks

    Science.gov (United States)

    Alexovich, Robert

    1990-01-01

    A task order was written by the High Resolution, High Frame Rate Video Technology (HHVT) project engineers to investigate data compression techniques that could be applied to the HHVT system, and both existing and planned downlink/uplink capabilities of the Space Shuttle and Space Station Freedom. The following tasks were included: (1) Investigate signal channel availability and determine both the maximum possible data rate and the average data rate; (2) Identify time blocks for HHVT video transmission assuming time sharing and interruptions in the communication links; (3) Determine the bit error rates to be expected; and (4) Define the transmit and receive interfaces. A summary chart of the data transmission capabilities for Tracking and Data Relay Satellite System (TDRSS), the Space Shuttle, Space Station Freedom, Spacelab, and USLab are also presented.

  2. Drill string transmission line

    Science.gov (United States)

    Hall, David R.; Hall, Jr., H. Tracy; Pixton, David S.; Bradford, Kline; Fox, Joe

    2006-03-28

    A transmission line assembly for transmitting information along a downhole tool comprising a pin end, a box end, and a central bore traveling between the pin end and the box end, is disclosed in one embodiment of the invention as including a protective conduit. A transmission line is routed through the protective conduit. The protective conduit is routed through the central bore and the ends of the protective conduit are routed through channels formed in the pin end and box end of the downhole tool. The protective conduit is elastically forced into a spiral or other non-linear path along the interior surface of the central bore by compressing the protective conduit to a length within the downhole tool shorter than the protective conduit.

  3. Mechanisms, Transmissions and Applications

    CERN Document Server

    Corves, Burkhard

    2012-01-01

    The first Workshop on Mechanisms, Transmissions and Applications -- MeTrApp-2011 was organized by the Mechatronics Department at the Mechanical Engineering Faculty, “Politehnica” University of Timisoara, Romania, under the patronage of the IFToMM Technical Committees Linkages and Mechanical Controls and Micromachines. The workshop brought together researchers and students who work in disciplines associated with mechanisms science and offered a great opportunity for scientists from all over the world to present their achievements, exchange innovative ideas and create solid international links, setting the trend for future developments in this important and creative field. The topics treated in this volume are mechanisms and machine design, mechanical transmissions, mechatronic and biomechanic applications, computational and experimental methods, history of mechanism and machine science and teaching methods.

  4. Regional transmission subsystem planning

    Energy Technology Data Exchange (ETDEWEB)

    Costa Bortoni, Edson da [Quadrante Softwares Especializados Ltda., Itajuba, MG (Brazil); Bajay, Sergio Valdir; Barros Correia, Paulo de [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Engenharia Mecanica; Santos, Afonso Henriques Moreira; Haddad, Jamil [Escola Federal de Engenharia de Itajuba, MG (Brazil)

    1994-12-31

    This work presents an approach for the planning of transmission systems by employing mixed--integer linear programming to obtain a cost and operating characteristics optimized system. The voltage loop equations are written in a modified form, so that, at the end of the analysis, the model behaves as a DC power flow, with the help of the two Kirchhoff`s laws, exempting the need of interaction with an external power flow program for analysis of the line loading. The model considers the occurrence of contingencies, so that the final result is a network robust to the most severe contingencies. This whole technique is adapted to the regional electric power transmission subsystems. (author) 9 refs., 4 figs.

  5. [Mumps vaccine virus transmission].

    Science.gov (United States)

    Otrashevskaia, E V; Kulak, M V; Otrashevskaia, A V; Karpov, I A; Fisenko, E G; Ignat'ev, G M

    2013-01-01

    In this work we report the mumps vaccine virus shedding based on the laboratory confirmed cases of the mumps virus (MuV) infection. The likely epidemiological sources of the transmitted mumps virus were children who were recently vaccinated with the mumps vaccine containing Leningrad-Zagreb or Leningrad-3 MuV. The etiology of the described cases of the horizontal transmission of both mumps vaccine viruses was confirmed by PCR with the sequential restriction analysis.

  6. Scanning transmission electron microscope

    OpenAIRE

    Kruit, P.

    2006-01-01

    The invention relates to a scanning transmission electron microscope comprising an electron source, an electron accelerator and deflection means for directing electrons emitted by the electron source at an object to be examined, and in addition a detector for detecting electrons coming from the object and, connected to the detector, a device for processing the detected electrons so as to form an object image, wherein a beam splitter is provided for dividing the electron beam from the electron...

  7. Hydrostatic continuously variable transmission

    Energy Technology Data Exchange (ETDEWEB)

    Hayashi, T.; Saito, M.; Matsuto, T.; Nakajima, Y.; Sakakibara, K.; Yakigaya, N.; Nakamura, K.

    1989-05-09

    A hydrostatic continuously variable transmission is described, comprising: a swashplate type hydraulic pump having a pump swashplate and annularly arranged pump plungers whose suction and discharge strokes are provided by the pump swashplate; a swashplate type hydraulic motor having a motor swashplate and annularly arranged motor plungers whose expansion and shrinkage strokes are provided by the motor swashplate; and a hydraulic closed circuit formed between the hydraulic pump and the hydraulic motor. The transmission has at least one of a relationship that a middle point of a discharge region of the hydraulic pump is angularly delayed at a given angle in a direction of rotation of the hydraulic pump relative to a tilting axis of the pump swashplate and a relationship that a middle point of an expansion region of the hydraulic motor is angularly advanced at a given angle in a direction of rotation of the hydraulic motor relative to a tilting axis of the motor swashplate, wherein the transmission has at least one of a relationship that a suction region of the hydraulic pump is set at an angle larger than that of the discharge region thereof and a relationship that a shrinkage region of the hydraulic motor is set at an angle larger than that of the expansion region of the motor.

  8. Dynamic simulation for distortion image with turbulence atmospheric transmission effects

    Science.gov (United States)

    Du, Huijie; Fei, Jindong; Qing, Duzheng; Zhao, Hongming; Yu, Hong; Cheng, Chen

    2013-09-01

    The imaging through atmospheric turbulence is an inevitable problem encountered by infrared imaging sensors working in the turbulence atmospheric environment. Before light-rays enter the window of the imaging sensors, the atmospheric turbulence will randomly interfere with the transmission of the light waves came from the objects, causing the distribution of image intensity values on the focal plane to diffuse, the peak value to decrease, the image to get blurred, and the pixels to deviate, and making image identification very difficult. Owing to the fact of the long processing time and that the atmospheric turbulent flow field is unknown and hard to be described by mathematical models, dynamic simulation for distortion Image with turbulence atmospheric transmission effects is much more difficult and challenging in the world. This paper discusses the dynamic simulation for distortion Image of turbulence atmospheric transmission effect. First of all, with the data and the optical transmission model of the turbulence atmospheric, the ray-tracing method is applied to obtain the propagation path of optical ray which propagates through the high-speed turbulent flow field, and then to calculate the OPD from the reference wave to the reconverted wave front and obtain the point spread function (PSF). Secondly, infrared characteristics models of typical scene were established according to the theory of infrared physics and heat conduction, and then the dynamic infrared image was generated by OpenGL. The last step is to obtain the distortion Image with turbulence atmospheric transmission effects .With the data of atmospheric transmission computation, infrared simulation image of every frame was processed according to the theory of image processing and the real-time image simulation, and then the dynamic distortion simulation images with effects of blurring, jitter and shifting were obtained. Above-mentioned simulation method can provide the theoretical bases for recovering

  9. Consciência metatextual: evidências de validade para instrumento de medida Consciencia metatextual: evidencias de validez para instrumento de medida Metatextual awareness: evidence of validity for measuring instrument

    Directory of Open Access Journals (Sweden)

    Acácia Aparecida Angeli dos Santos

    2012-08-01

    Full Text Available O objetivo estabelecido nesta pesquisa descritivo-correlacional foi a averiguação da consciência metatextual por meio de um questionário especialmente elaborado para este fim, analisando sua validade pela relação com medidas de compreensão de leitura e o critério de diferenciação do nível escolar. Participaram 315 alunos do 3º ao 5º ano do ensino fundamental, de escolas públicas, cujas idades variaram de 8 a 13 anos, sendo 169 meninos. Os escores obtidos com a medida de avaliação da consciência metatextual (QACM foram convergentes com a pontuação em compreensão de leitura e o instrumento mostrou-se sensível para captar o progresso das crianças em identificar os gêneros textuais com o avanço da escolaridade. Dessa forma, o estudo forneceu evidências de validade tanto no que se refere à convergência de construtos, identificada com base nas medidas relacionadas, como de critério, distinguindo os alunos pelo seu nível de escolaridade.El objetivo establecido en esta investigación descriptivo-correlacional fue averiguar la consciencia metatextual a través de un cuestionario especialmente diseñado para este fin, analizando su validez por la relación con medidas de comprensión de lectura y el criterio de diferenciación por nivel escolar. Participaron 315 alumnos del 3º al 5º año de la enseñanza básica, de escuelas públicas, cuyas edades variaron de 8 a 13 años, siendo 169 niños. Los puntajes obtenidos con la medida de evaluación de la consciencia metatextual (QACM fueron convergentes con los de la comprensión de lectura y el instrumento se mostró sensible para captar el desarrollo de los niños en identificar los géneros textuales con el avance de la escolaridad. De esa forma, el estudio forneció evidencias de validez por la convergencia de constructos, identificada con base en las medidas relacionadas, como de criterio, distinguiendo los alumnos por su nivel de escolaridad.The stated goal of this

  10. Enfermeiros de Unidade de Terapia Intensiva adulto: avaliação sobre medida direta e indireta da pressão arterial

    National Research Council Canada - National Science Library

    Almeida, Taciana da Costa Farias; Lamas, José Luiz Tatagiba

    2013-01-01

    Estudo descritivo e de corte transversal que teve como objetivo avaliar e autoavaliar o conhecimento de enfermeiros de Unidades de Terapia Intensiva adulto sobre medida direta e indireta da pressão arterial...

  11. Medidas procesales especiales y proteccíon de los derechos humanos
    Informe general

    Directory of Open Access Journals (Sweden)

    John A.E. Vervaele

    2009-10-01

    Full Text Available El objetivo del informe general es realizar un análisis comparativo de los informes nacionales para evidenciar los procesos de transformación de los sistemas nacionales de justicia penal, en particular del proceso penal, en el que se han introducido medidas procesales especiales para hacer frente al terrorismo y al crimen organizado, y determinar si esto ha llevado a los países a apartarse de sus propias normas fundamentales, procedimientos, principios y estándares de derechos humanos aplicables. Partiendo de la premisa de que el sistema integrado de derecho penal tiene tres dimensiones – la protección de las personas (la dimensión de escudo, la disposición de instrumentos de aplicación de la ley (la dimensión de la espada y de pesos y contrapesos / trias politica (la dimensión constitucional – el informe ofrece un panorama general de las transformaciones relacionadas entre sí, principalmente en la fase previa al juicio, que han afectado a tales dimensiones como consecuencia de tres oleadas de ‘guerras’ (contra las drogas, el crimen organizado y el terrorismo. En muchos países, las garantías procesales y los principios que protegen frente a violaciones del derecho a un juicio justo son considerados una carga para la eficacia de la persecución de los delitos graves. Estas reformas han dado lugar a una clara expansión del estado punitivo y a que queden difuminadas las distinciones clásicas, y no favorecen al estado de derecho. El actuar centrado en la seguridad pública y en la investigación coactiva preventiva socava el sistema de justicia penal. Con un sistema de justicia penal utilizado crecientemente como instrumento para regular el presente y/o el futuro en lugar de para castigar el comportamiento pasado, y un proceso penal en el que la investigación previa al juicio no se dirige a conocer la verdad en relación con el delito cometido, sino a la construcción y de-construcción de la peligrosidad social, los

  12. Soil compaction: Evaluation of stress transmission and resulting soil structure

    Science.gov (United States)

    Naveed, Muhammad; Schjønning, Per; Keller, Thomas; Lamande, Mathieu

    2016-04-01

    Accurate estimation of stress transmission and resultant deformation in soil profiles is a prerequisite for the development of predictive models and decision support tools for preventing soil compaction. Numerous studies have been carried out on the effects of soil compaction, whilst relatively few studies have focused on the cause (mode of stress transmission in the soil). We have coupled both cause and effects together in the present study by carrying out partially confined compression tests on (1) wet aggregates, (2) air dry aggregates, and (3) intact soils to quantify stress transmission and compaction-resulted soil structure at the same time. Stress transmission was quantified using both X-ray CT and Tactilus sensor mat, and soil-pore structure was quantified using X-ray CT. Our results imply that stress transmission through soil highly depends on the magnitude of applied load and aggregate strength. As soon as the applied load is lower than the aggregate strength, the mode of stress transmission is discrete as stresses were mainly transmitted through chain of aggregates. With increasing applied load soil aggregates start deforming that transformed heterogeneous soil into homogenous, as a result stress transmission mode was shifted from discrete towards more like a continuum. Continuum-like stress transmission mode was better simulated with Boussinesq (1885) model based on theory of elasticity compared to discrete. The soil-pore structure was greatly affected by increasing applied stresses. Total porosity was reduced 5-16% and macroporosity 50-85% at 620 kPa applied stress for the intact soils. Similarly, significant changes in the morphological indices of the macropore space were also observed with increasing applied stresses.

  13. Medidas de actuación para la prevención de la toxiinfección alimentaria

    Directory of Open Access Journals (Sweden)

    María Ascensión Maestre Naranjo

    2008-09-01

    Full Text Available La toxiinfección alimentaria manifestada en forma de brotes tiene gran importancia desde el punto de vista epidemiológico. Tras analizar su etiología se instauran las medidas preventivas y de seguridad en todos los procesos de manipulación de alimentos, así como las medidas de prevención para los trabajadores manipuladores de alimentos. Se insiste de forma especial en la información y formación que deben recibir estos trabajadores, para concienciar y fomentar su responsabilidad y educación en las medidas higiénico sanitarias que favorecen su desarrollo. En caso de producirse el brote se marcan las pautas a seguir para su notificación, por la gran importancia legal y epidemiológica que comporta.The alimentary toxiinfección manifested in form of buds has great importance from the epidemic point of view. After analyzing their etiología the preventive measures they are established and of security in all the processes of manipulation of foods, as well as the measures of prevention for the hard-working manipulators of foods. It is insisted in a special way in the information and formation that these workers should receive, to make aware and to foment their responsibility and education in the hygienic sanitary measures that favor their development. In the event of taking place the bud the rules they are marked to continue for their notification, for the legal and epidemic great importance that behaves.

  14. Medidas de conservación y ordenación pesquera del jurel Trachurus murphyien el Perú

    Directory of Open Access Journals (Sweden)

    Jorge Zuzunaga

    2013-10-01

    Full Text Available Las pesquerías peruanas como actividades realizadas sobre recursos naturales renovables son reguladas por un marco jurídico, cuyo objetivo es asegurar su conservación y uso sostenible. La Ley General de Pesca (DL N°. 25977 señala que para cada tipo de pesquería y según la situación del recurso explotado debe establecerse un sistema de ordenamiento que concilie el principio de sostenibilidad de los recursos pesqueros o conservación en el largo plazo, con la obtención de los mayores beneficios económicos y sociales. En el ordenamiento pesquero del jurel Trachurus murphyi, las medidas incluyen entre otras, el régimen de acceso constituido por las autorizaciones de incremento de flota y permisos de pesca, que se otorgan solo a los buques cuyas capturas son destinadas únicamente para el consumo humano directo, de acuerdo a lo dispuesto en el Reglamento de Ordenamiento Pesquero (DS N.° 011-2007-PRODUCE. La obligación de destinar los recursos sardina Sardinops sagax, jurel T. murphyiy caballa Scomber japonicus al consumo humano directo rige desde septiembre 2002 (DS N°. 001-2002-PRODUCE. Otras medidas vigentes restringen el tamaño mínimo de malla de las redes, prohíben la captura de ejemplares menores de 31 cm de longitud total, determinan el inicio y cierre de las temporadas de pesca, los límites de captura o cuotas anuales. Estas disposiciones son complementadas por medidas de seguimiento, control y vigilancia para la efectiva conservación y uso sostenido del recurso.

  15. Transmission of compressed video

    Science.gov (United States)

    Pasch, H. L.

    1990-09-01

    An overview of video coding is presented. The aim is not to give a technical summary of possible coding techniques, but to address subjects related to video compression in general and to the transmission of compressed video in more detail. Bit rate reduction is in general possible by removing redundant information; removing information the eye does not use anyway; and reducing the quality of the video. The codecs which are used for reducing the bit rate, can be divided into two groups: Constant Bit rate Codecs (CBC's), which keep the bit rate constant, but vary the video quality; and Variable Bit rate Codecs (VBC's), which keep the video quality constant by varying the bit rate. VBC's can be in general reach a higher video quality than CBC's using less bandwidth, but need a transmission system that allows the bandwidth of a connection to fluctuate in time. The current and the next generation of the PSTN does not allow this; ATM might. There are several factors which influence the quality of video: the bit error rate of the transmission channel, slip rate, packet loss rate/packet insertion rate, end-to-end delay, phase shift between voice and video, and bit rate. Based on the bit rate of the coded video, the following classification of coded video can be made: High Definition Television (HDTV); Broadcast Quality Television (BQTV); video conferencing; and video telephony. The properties of these classes are given. The video conferencing and video telephony equipment available now and in the next few years can be divided into three categories: conforming to 1984 CCITT standard for video conferencing; conforming to 1988 CCITT standard; and conforming to no standard.

  16. Medida y evaluación de la contaminación lumínica en entornos urbanos

    OpenAIRE

    Navas-Borrero, José Luis

    2015-01-01

    Coincidiendo con el planteamiento inicial de esta tesis y la entonces reciente aparición del decreto 357/2010, de 3 de agosto de la Junta de Andalucía por el que se aprueba el reglamento de la calidad del cielo nocturno frente a la contaminación lumínica y el establecimiento de medidas de ahorro y eficiencia energética, se estaban produciendo cambios sustanciales tanto en lo referente a normativas y requerimientos técnicos para su aplicación como en lo referente a tecnologías de alumbrado e i...

  17. Nivel de conocimiento y aplicación de las medidas de bioseguridad del personal de enfermería

    OpenAIRE

    Luz Marina Bautista-Rodríguez; Carmen Celene Delgado-Madrid; Zulma Fabiola Hernández-Zárate; Fanny Edith Sanguino-Jaramillo; Martha Liliana Cuevas-Santamaría; Yessenia Tatiana Arias-Contreras; Isabel Carolina Mojica-Torres

    2013-01-01

    Objetivo. Identificar el nivel de conocimiento y aplicación de las medidas de bioseguridad que tiene el personal de Enfermería. Materiales y Métodos. Se realizó investigación cuantitativa, de tipo descriptivo transversal, con una muestra de 96 personas pertenecientes. La información se recolectó a través de una encuesta y una lista de chequeo, la cual se analizó por medio de tabulaciones y representaciones gráficas. Resultados. El personal de Enfermería de la Clínica San José tiene un conoc...

  18. Una visión creativa de las magnitudes y su medida en Educación Infantil

    OpenAIRE

    Sánchez Segura, Mª Dolores

    2012-01-01

    En esta tesis se introducen las nociones matemáticas a través de las diferentes técnicas de Metodología Creativa que serán utilizadas para las definiciones formales de magnitud y de medida y para su enseñanza en Educación Infantil. Se clasifican los distintos tipos de magnitudes en magnitudes finitas e infinitas, magnitudes absolutas y relativas, magnitudes divisibles e indivisibles y magnitudes escalares y vectoriales. Dentro de las magnitudes escalares se distinguen las magnitudes di...

  19. Usando o Excel para medidas de intervalo de tempo no laboratório de Física

    OpenAIRE

    Figueira, Jalves S.; Veit, Eliane A.

    2004-01-01

    Apresentamos neste trabalho uma proposta de uso da planilha Excel como instrumento na aquisição e análise de dados em experimentos didáticos de Física, em particular, em medidas de intervalo de tempo. A aquisição de dados é feita através da entrada digital da porta de jogos da placa de som do microcomputador, utilizando sensores de infravermelho e uma macro do Excel para leitura desta entrada (com um arquivo DLL específico). Duas experiências didáticas são ilustradas: um pêndulo amortecido e ...

  20. Medida del espectro neutrónico con un detector de 3He en el experimento TARC

    OpenAIRE

    Abánades Velasco, Alberto

    2011-01-01

    El experimento TARC se ha desarrollado en el CERN en el marco de un programa encaminado a desarrollar técnicas de transmutación nuclear orientadas a la eliminación de residuos radiactivos y la producción de energía. En ese experimento se realizaron medidas del espectro neutrónico obtenido en un gran bloque de plomo contra el que se hacian colisionar protones de alta energía para obtener neutrones mediante reacciones de espalación. Uno de los objetivos del experimento fue la medición detallada...

  1. Medidas de control de tuberculosis en una institución de salud de Bogotá D.C

    Directory of Open Access Journals (Sweden)

    Alba I. Muñoz-Sánchez

    2016-02-01

    Full Text Available Resumen Objetivo: evaluar la implementación de medidas de control, de tipo administrativo, ambiental y de protección respiratoria, de la infección de tuberculosis en un hospital de III nivel de atención en la ciudad de Bogotá D.C. Metodología: estudio de tipo descriptivo, transversal. Para la recolección de datos se aplicó una herramienta de autorreporte a 158 trabajadores de la salud del hospital, se realizó una entrevista estructurada al responsable del programa institucional de control de tuberculosis y una visita de observación de un experto en salud y seguridad laboral a las diferentes áreas de trabajo, para indagar por la implementación de medidas de control de infección de tuberculosis en la institución. Resultados: el responsable del programa institucional de control de tuberculosis y 158 trabajadores de la salud del hospital objeto de estudio reportaron una deficiente implementación de medidas de control de tuberculosis, de tipo administrativo, ambiental y de protección respiratoria en la institución, lo cual fue corroborado por el experto. Conclusiones: la deficiente implementación de medidas de control de infección de tuberculosis en instituciones de la salud, y algunas condiciones de trabajo presentes pueden favorecer la exposición ocupacional de los trabajadores de la salud al Mycobacterium Tuberculosis. Abstract Objective: to evaluate the implementation of tuberculosis infection control measures in administrative, environmental and respiratory protection equipment in a third level hospital in Bogota D.C. Methodology: a descriptive, cross-sectional study. Data were collected through a self-reporting instrument applied on 158 health care workers. The chief officer of the institutional program for tuberculosis control participated in a structured interview. In addition, an expert in occupational health and safety conducted an observational visit to the different workplaces in order to inquire on the implementation

  2. Research and Transmission

    Directory of Open Access Journals (Sweden)

    Denise Pumain

    2001-01-01

    Full Text Available The present situation provides a challenge for us to reconsider the necessary link between science and pedagogy, between research and the transmission of knowledge. The Ministry of National education has just inaugurated a broad consultation of teachers on every level with a view to modernising and giving coherence to the programs of secondary education. Armand Frémont will head the group of experts responsible for history and geography. Is this a coincidence? The changeover in the jury for t...

  3. Joint x-ray

    Science.gov (United States)

    X-ray - joint; Arthrography; Arthrogram ... x-ray technologist will help you position the joint to be x-rayed on the table. Once in place, pictures are taken. The joint may be moved into other positions for more ...

  4. Broadband transmission EPR spectroscopy.

    Directory of Open Access Journals (Sweden)

    Wilfred R Hagen

    Full Text Available EPR spectroscopy employs a resonator operating at a single microwave frequency and phase-sensitive detection using modulation of the magnetic field. The X-band spectrometer is the general standard with a frequency in the 9-10 GHz range. Most (biomolecular EPR spectra are determined by a combination of the frequency-dependent electronic Zeeman interaction and a number of frequency-independent interactions, notably, electron spin - nuclear spin interactions and electron spin - electron spin interactions, and unambiguous analysis requires data collection at different frequencies. Extant and long-standing practice is to use a different spectrometer for each frequency. We explore the alternative of replacing the narrow-band source plus single-mode resonator with a continuously tunable microwave source plus a non-resonant coaxial transmission cell in an unmodulated external field. Our source is an arbitrary wave digital signal generator producing an amplitude-modulated sinusoidal microwave in combination with a broadband amplifier for 0.8-2.7 GHz. Theory is developed for coaxial transmission with EPR detection as a function of cell dimensions and materials. We explore examples of a doublet system, a high-spin system, and an integer-spin system. Long, straigth, helical, and helico-toroidal cells are developed and tested with dilute aqueous solutions of spin label hydroxy-tempo. A detection limit of circa 5 µM HO-tempo in water at 800 MHz is obtained for the present setup, and possibilities for future improvement are discussed.

  5. Demonstration of X-ray talbot interferometry

    CERN Document Server

    Momose, A; Kawamoto, S; Hamaishi, Y; Takai, K; Suzuki, Y

    2003-01-01

    First Talbot interferometry in the hard X-ray region was demonstrated using a pair of transmission gratings made by forming gold stripes on glass plates. By aligning the gratings on the optical axis of X-rays with a separation that caused the Talbot effect by the first grating, moire fringes were produced inclining one grating slightly against the other around the optical axis. A phase object placed in front of the first grating was detected by moire-fringe bending. Using the technique of phase-shifting interferometry, the differential phase corresponding to the phase object could also be measured. This result suggests that X-ray Talbot interferometry is a novel and simple method for phase-sensitive X-ray radiography. (author)

  6. Small passenger car transmission test: Mercury Lynx ATX transmission

    Energy Technology Data Exchange (ETDEWEB)

    Bujold, M P

    1981-09-01

    The small passenger car transmission test was initiated to supply electric vehicle manufacturers with technical information regarding the performance of commercially available transmissions. This information would enable EV manufacturers to design a more energy efficient vehicle. With this information the manufacturers would be able to estimate vehicle driving range as well as speed and torque requirements for specific road load performance characteristics. This report covers the 1981 Mercury Lynx ATX transaxle. This transmission was tested per a passenger car automatic transmission test code (SAE J65lb) which required drive performance, coast performance, and no load test conditions. Under these test conditions the transmission attained maximum efficiencies in the 93% range for drive performance tests. The major results of this test are the torque, speed and efficiency curves which are located in the data section of this report. These graphs map performance characteristics for the Mercury Lynx ATX transmission.

  7. Small passenger car transmission test-Chevrolet 200 transmission

    Science.gov (United States)

    Bujold, M. P.

    1980-01-01

    The small passenger car transmission was tested to supply electric vehicle manufacturers with technical information regarding the performance of commerically available transmissions which would enable them to design a more energy efficient vehicle. With this information the manufacturers could estimate vehicle driving range as well as speed and torque requirements for specific road load performance characteristics. A 1979 Chevrolet Model 200 automatic transmission was tested per a passenger car automatic transmission test code (SAE J651b) which required drive performance, coast performance, and no load test conditions. The transmission attained maximum efficiencies in the mid-eighty percent range for both drive performance tests and coast performance tests. Torque, speed and efficiency curves map the complete performance characteristics for Chevrolet Model 200 transmission.

  8. Medida educativa estabelecida em razão do porte ilegal de drogas: relato de experiência

    Directory of Open Access Journals (Sweden)

    André Bomfim Dias

    2016-09-01

    Full Text Available Este trabalho relata a experiência de um grupo de atenção a pessoas encaminhadas pela justiça para cumprimento de medida educativa, em razão de conduta enquadrada no artigo 28 da Lei 11.343/2006 – porte ilegal de drogas para consumo próprio. Em seis encontros semanais, cinco participantes falaram do prazer e sofrimento associado ao uso de drogas, das dificuldades em suportar a abstinência, das possibilidades de minimização de riscos e danos, de seus projetos de vida e da legalização como estratégia para promoção da saúde e enfraquecimento do narcotráfico e da criminalidade. A despeito do caráter compulsório da medida, a intervenção fomentou reflexões críticas e emancipatórias sobre o uso de drogas na contemporaneidade. Destaca-se, neste cenário, a relevância do relato de projetos educativos que se sustentam na contramão de discursos de sujeição e punitivos.

  9. Violencia de género en el ámbito universitario. Medidas para su superación.

    Directory of Open Access Journals (Sweden)

    Consol Aguilar Ródenas

    2009-01-01

    Full Text Available Este artículo expone parte de los resultados de la primera investigación sobre violencia de género en las universidades españolas. A partir de la revisión de investigaciones internacionales, mostramos que la violencia de género tiene una presencia importante en las universidades. Posteriormente, identificamos medidas para la prevención y superación de la violencia de género que ya se están desarrollando en algunas de las universidades de más prestigio internacional. Ambos aspectos son el punto de partida para el estudio de la violencia de género en las universidades españolas y para el diseño de medidas que contribuyan a su superación.---------------------------------------------------------------------This article contains some of the results from the first research on gender violence in Spanish universities. Based on a review of international research, we demonstrate that gender violence is prevalent in universities. Subsequently, we identify measures to prevent and overcome gender violence which are already being developed in some of the most prestigious international universities. Both of these aspects are the starting off point to study gender violence in Spanish universities and to design measures which contribute towards overcoming it.

  10. EXPECTATIVAS Y PRIMA POR RIESGO INFLACIONARIO CON UNA MEDIDA DE COMPENSACIÓN A LA INFLACIÓN

    Directory of Open Access Journals (Sweden)

    Luis Fernando Melo Velandia

    2012-01-01

    Full Text Available En este documento se estima una medida de compensación inflacionaria (Break Even Inflation usando los rendimientos de los bonos de deuda del gobierno colombiano (TES en pesos e indizados a unidades de valor real (UVR para el periodo comprendido entre enero de 2003 y noviembre de 2009. Esta medida se descompone en expectativas de inflación y prima por riesgo inflacionario. Las expectativas de inflación se calculan con base en la representación de estado espacio de un modelo afín de estructura a término extendido. Con objeto de mejorar los pronósticos, este modelo incorpora las expectativas de inflación a 12 meses de la encuesta mensual del Banco de la República. Los resultados muestran una tendencia a la baja tanto de las expectativas de inflación como de la prima por riesgo inflacionario. Esto puede deberse al aumento de la confianza en la política monetaria por parte de los agentes. Además, los resultados indican que a corto plazo, la compensación inflacionaria es un buen indicador de expectativas de inflación.

  11. Medidas cautelares en los procesos arbitrales: ¿Taxatividad o enunciación de las cautelas?

    Directory of Open Access Journals (Sweden)

    Gabriel Angel Hernández-Villarreal

    2010-03-01

    Full Text Available Cada vez adquieren mayor fuerza los denominados métodos alternativos de solución de conflictos. Dentro de estos el arbitraje ocupa un papel preponderante. Por ese motivo, lo atinente a las medidas cautelares que pueden decretar los árbitros se erige en un tema de par­ticular interés para quienes intervienen en un proceso de esta naturaleza, y de ahí que este artículo se ocupe de presentar el fundamento de las cautelas; cuál es su régi­men legal; qué tratamiento tienen según se trate de ar­bitraje nacional o internacional y, finalmente, a qué conclusiones se puede llegar en torno a este asunto, tra­tando de probar -como es apenas obvio- la tesis cen­tral del autor, conforme a la cual en el ordenamiento juridico colombiano las aludidas medidas tienen una consagración meramente enunciativa y no taxativa.

  12. La repetición máxima en el ejercicio de sentadilla: procedimientos de medida y factores determinantes

    Directory of Open Access Journals (Sweden)

    Inmaculada García Sánchez

    2011-06-01

    Full Text Available En la actualidad, investigadores y entrenadores utilizan la repetición máxima (1RM en el ejercicio de sentadilla como la medida más identificativa y representativa de la máxima fuerza muscular en el movimiento de extensión de cadera y rodilla. El presente trabajo de revisión tiene el propósito de describir los procedimientos utilizados en investigación para evaluar la 1RM en el ejercicio de sentadilla y analizar los factores determinantes de su rendimiento. Con muestras de sujetos entrenados, en la mayoría de estudios revisados se utilizan protocolos de medida muy similares. Además, la heterogeneidad de los resultados publicados en relación al rendimiento obtenido en la 1RM se debe fundamentalmente a diferencias relacionadas con la edad y sexo de los ejecutantes, la técnica de ejecución del ejercicio de sentadilla y/o el historial de entrenamiento de fuerza de la muestra seleccionada según práctica deportiva.

  13. estadísticos alternativos para evaluar la robustez mediante diseños de medidas repetidas

    Directory of Open Access Journals (Sweden)

    Pablo Livacic-Rojas

    2006-01-01

    Full Text Available El propósito de la presente investigación radica en evaluar la robustez de una serie de nuevos procedimientos alternativos al tradicional enfoque ANOVA para analizar datos de medidas repetidas mediante el método de simulación Monte Carlo. Para estudiar la eficacia de estos procedimientos en el control de las tasas de error de Tipo I se manipularon cuatro variables: tamaño de la muestra, estructura de las matrices de dispersión, relación entre el tamaño de los grupos y el de las matrices de dispersión y forma de distribución de la población. Los resultados obtenidos sugieren que los procedimientos Aproximación General Mejorada, Proc Mixed con la solución Kenward-Roger, Brown-Forsythe y Welch James ofrecen un muy buen comportamiento para controlar las tasas de error de Tipo I, tanto para el efecto principal de las ocasiones de medida como para el efecto de la interacción, bajo todas las condiciones evaluadas

  14. MEDIDAS PREVENTIVAS DE SALUD A FINALES DEL SIGLO XIX EN LA CIUDAD DE MEXICO: UNA EVIDENCIA ARQUEOLÓGICA

    Directory of Open Access Journals (Sweden)

    Alfredo Feria C.

    2013-01-01

    Full Text Available En la época prehispánica, en México, por la ignorancia, la falta de medidas sanitarias y la falta de medicamentos específicos, prevalecían un sinnúmero de enfermedades entre la población. Las más importantes eran las enfermedades infecciosas y parasitarias que, en forma de epidemias, determinaban la muerte de un gran número de pobladores, principalmente niños, jóvenes y mujeres en edad reproductiva. Muy pocas personas llegaban a edad avanzada, por lo que eran consideradas como sabias y de especial jerarquía. Esto no fue muy diferente en la época de la conquista y los siglos subsecuentes, principalmente en las zonas perimetrales de la Ciudad de México, en los llamados “cinturones de miseria”. En el convento que funcionó en la orden de los Betlemitas, perteneciente al Banco de México y considerado como uno de los edificios históricos más representativos del Siglo XVIII se encontraron numerosas y muy valiosas evidencias que han permitido llegar a extraordinarias conclusiones en materia de estilos de vida, condiciones sanitarias, enfermedades prevalentes, medidas preventivas y procedimientos terapéuticos durante la época prehispánica y en los siglos XVII al XX.

  15. Transmission electron microscopy physics of image formation and microanalysis

    CERN Document Server

    Reimer, Ludwig

    1993-01-01

    "Transmission Electron Microscopy" presents the theory of image and contrastformation, and the analytical modes in transmission electron microscopy Theprinciples of particle and wave optics of electrons are described Electron-specimen interactions are discussed for evaluating the theory of scattering and phase contrast Also analysed are the kinetical and dynamical theories of electron diffraction and their applications for crystal-structure determination and imaging of lattices and their defects X-ray microanalysis and electron energy-loss spectroscopy are treated as analytical methods The third edition includes a brief discussionof Schottky emission guns, some clarification of minor details, and references to the recent literature

  16. Compound refractive lenses as prefocusing optics for X-ray FEL radiation

    Energy Technology Data Exchange (ETDEWEB)

    Heimann, Philip, E-mail: paheim@slac.stanford.edu [SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025 (United States); MacDonald, Michael [SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025 (United States); University of Michigan, 500 South State Street, Ann Arbor, MI 48109 (United States); Nagler, Bob; Lee, Hae Ja; Galtier, Eric; Arnold, Brice; Xing, Zhou [SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025 (United States)

    2016-02-17

    A prefocusing compound refractive lens was implemented for the Matter under Extreme Conditions Instrument at the Linac Coherent Light Source. A significant improvement in the beamline transmission was calculated and observed at 5 keV. The performance of X-ray free-electron laser beamlines may be limited by the angular aperture. Compound refractive lenses (CRLs) can be employed to prefocus the X-ray beam, thereby increasing the beamline transmission. A prefocusing CRL was implemented in the X-ray transport of the Matter under Extreme Conditions Instrument at the Linac Coherent Light Source. A significant improvement in the beamline transmission was calculated over the 3–10 keV photon energy range. At 5 keV, the relative X-ray intensity was measured and a factor of four increase was seen in the beamline transmission. The X-ray focus was also determined by the ablation imprint method.

  17. Medidas relativas al acoso escolar y ciberacoso en la normativa autonómica española. Un estudio comparativo

    Directory of Open Access Journals (Sweden)

    Fuensanta Cerezo Ramírez

    2017-01-01

    Full Text Available Sendos informes del Defensor del Pueblo Español alertaron de la necesidad de adoptar medidas para controlar el acoso entre escolares y mejorar la convivencia en las aulas. Sus recomendaciones fueron recogidas por las Comunidades Autónomas (CC.AA. y plasma das en normativas propias. El presente artículo reflexiona sobre las medidas adoptadas, como normas de convivencia, por las administraciones públicas, para los centros educativos sostenidos con fondos públicos. Se plantea un estudio comparativo sobre la no rmativa relacionada con los fenómenos de acoso escolar o bullying y ciberacoso o cyberbullying en ocho CC.AA. seleccionadas al azar. El objetivo principal es conocer cómo se ha abordado esta problemática, así como comparar los protocolos de actuación propu estos y el carácter de las medidas recogidas para su intervención en cada CC.AA. Los resultados indican que la mayoría de las políticas hacen referencia expresa al bullying y una de cada cuatro menciona el cyberbullying, también se detectó que la mitad de los protocolos proponen medidas de actuación ante violencia escolar. En cuanto al carácter de las medidas adoptadas, el análisis demuestra que éstas se dirigen, casi exclusivamente, al alumnado agresor y que, en la mayoría de los casos, son de índole corre ctiva/disciplinaria. Se destaca que en las normativas apenas se hace referencia a medidas de carácter educativo, dejando sin respuesta la propuesta del Defensor del Pueblo que hacía hincapié en las medidas educativas.

  18. Fiber optic data transmission

    Science.gov (United States)

    Shreve, Steven T.

    1987-01-01

    The Ohio University Avionics Engineering Center is currently developing a fiber optic data bus transmission and reception system that could eventually replace copper cable connections in airplanes. The original form of the system will transmit information from an encoder to a transponder via a fiber optic cable. An altimeter and an altitude display are connected to a fiber optic transmitter by copper cable. The transmitter converts the altimetry data from nine bit parallel to serial form and send these data through a fiber optic cable to a receiver. The receiver converts the data using a cable similar to that used between the altimeter and display. The transmitting and receiving ends also include a display readout. After completion and ground testing of the data bus, the system will be tested in an airborne environment.

  19. Stress transmission in soil

    DEFF Research Database (Denmark)

    Lamandé, Mathieu; Schjønning, Per

    We urgently need increased quantitative knowledge on stress transmission in real soils loaded with agricultural machinery. 3D measurements of vertical stresses under tracked wheels were performed in situ in a Stagnic Luvisol (clay content 20 %) continuously cropped with small grain cereals......). Seven load cells were inserted horizontally from a pit with minimal disturbance of soil in each of three depths (0.3, 0.6 and 0.9 m), covering the width of the wheeled area. The position of the wheel relative to the transducers was recorded using a laser sensor. Finally, the vertical stresses near...... the soil-tyre interface were measured in separate tests by 17 stress transducers across the width of the tyres. The results showed that the inflation pressure controlled the level of maximum stresses at 0.3 m depth, while the wheel load was correlated to the measured stresses at 0.9 m depth. This supports...

  20. Broadband Transmission EPR Spectroscopy

    Science.gov (United States)

    Hagen, Wilfred R.

    2013-01-01

    EPR spectroscopy employs a resonator operating at a single microwave frequency and phase-sensitive detection using modulation of the magnetic field. The X-band spectrometer is the general standard with a frequency in the 9–10 GHz range. Most (bio)molecular EPR spectra are determined by a combination of the frequency-dependent electronic Zeeman interaction and a number of frequency-independent interactions, notably, electron spin – nuclear spin interactions and electron spin – electron spin interactions, and unambiguous analysis requires data collection at different frequencies. Extant and long-standing practice is to use a different spectrometer for each frequency. We explore the alternative of replacing the narrow-band source plus single-mode resonator with a continuously tunable microwave source plus a non-resonant coaxial transmission cell in an unmodulated external field. Our source is an arbitrary wave digital signal generator producing an amplitude-modulated sinusoidal microwave in combination with a broadband amplifier for 0.8–2.7 GHz. Theory is developed for coaxial transmission with EPR detection as a function of cell dimensions and materials. We explore examples of a doublet system, a high-spin system, and an integer-spin system. Long, straigth, helical, and helico-toroidal cells are developed and tested with dilute aqueous solutions of spin label hydroxy-tempo. A detection limit of circa 5 µM HO-tempo in water at 800 MHz is obtained for the present setup, and possibilities for future improvement are discussed. PMID:23555819

  1. Programa educativo em medidas de precaução universais: uma metodologia de abordagem Abordaje de una nueva metodologia: reciclaje de medidas de precaución universales Updating measures on universal precautions: a new approach methodology

    Directory of Open Access Journals (Sweden)

    Maria Helena Baena de Moraes Lopes

    1997-04-01

    Full Text Available No Centro de Atenção Integral à Saúde da Mulher (CAISM desenvolveu-se um programa de reciclagem sobre as Medidas de Precaução Universais (MPU e divulgou-se, através de uma cartilha, essas medidas e os procedimentos em caso de acidente de trabalho. Primeiramente, o funcionário era sensibilizado para a questão do estresse e sua influência sobre a qualidade de vida e, após, era realizada a reciclagem promovendo-se a reflexão sobre as conseqüências da não adoção das MPU. Foram respondidos e analisados 286 pré-testes e 242 pós-testes com um índice de acertos significativamente maior nestes últimos (pEl Centro de Atención Integral a la Salud de la Mujer (CAISM desarrolló un programa de reciclaje sobre Medidas de Precaución Universales (MPU. Se divulgó por medio de un material educativo (cartilla las MPU y procedimientos en caso de accidentes de trabajo. En primer lugar se cuestionó al funcionário sobre el stress y su influencia en la calidad de vida, llevando se a cabo el reciclaje en el cual se promovió la reflexión sobre consecuencias cuando las MPU no son adoptadas. Fueron respondidas y analizadas 286 pre-test y 242 pos-test con un índice de acierto significativamente mayor en este último (p An updating program on measures of universal precautions (M.U.P. was developed at the Center of Whole Care of Woman's Health (Centro de Atenção Integral à Saúde da Mulher - CAISM. These measures and the procedures in the case of work accident were published in a booklet. First, servants should be aware of the matter of stress and its influence on the quality of life. Then, updating was carried through encouraging the reflection on the consequences of the non-adoption of M.U.P. The answers to 286 pre-tests and 242 post-tests were analyzed and the results showed a significantly higher index of correct answers (p< 0,01, mainly regarding the appropriate use of glove.

  2. La medida del pie medieval en Santa María de Poblet : el sistema de medidas de los sillares medievales = La mesure du pied médiéval à Sainte Marie de Poblet : la mesure des pierres de taille médiévale

    OpenAIRE

    Lloveras Montserrat, Joaquín

    2015-01-01

    Descripció del recurs: 17 de desembre de 2015 Un único sistema de medidas medievales formado, entre otras unidades, por el Pie. El objetivo de este documento es mostrar cómo, en la Capilla de Sant Esteban de Poblet, se constata la afirmación de que en la edad medieval se usó, en la Europa cristiana, un único sistema de medidas para la construcción de los edificios religiosos. También constatar la idea de que el conjunto de las medidas empleadas por los constructores medievales son, obvi...

  3. Comparação e correlação entre automedida, medida casual e monitorização ambulatorial da pressão arterial

    Directory of Open Access Journals (Sweden)

    Weimar Kunz Sebba Barroso de Souza

    2011-08-01

    Full Text Available FUNDAMENTO: A medida casual da pressão arterial (PA pelos profissionais de saúde está sujeita a uma grande variabilidade, sendo necessário buscar novos métodos que possam superar essa limitação. OBJETIVO: Comparar e avaliar a correlação entre os níveis de PA obtidos por meio da automedida da pressão arterial (AMPA com a medida casual e com a monitorização ambulatorial da pressão arterial (MAPA. MÉTODOS: Avaliamos hipertensos que realizaram as três metodologias de medida da PA com intervalo menor que 30 dias; as médias das pressões foram utilizadas para comparação e correlação. Foram empregados os aparelhos: OMRON 705 CP (medida casual, OMRON HEM 714 (AMPA e SPACELABS 9002 (MAPA. RESULTADOS: Foram avaliados 32 pacientes, 50,09% mulheres, idade média 59,7 (± 11,2 anos, média do IMC 26,04 (± 3,3 kg/m². Valores médios de pressão sistólica (PAS e pressão diastólica (PAD para a AMPA foram de 134 (± 15,71mmHg e 79,32 (± 12,38 mmHg. Na medida casual as médias da PAS e PAD foram, respectivamente, 140,84 (± 16,15mmHg e 85 (± 9,68 mmHg. Os valores médios da MAPA na vigília foram 130,47 (± 13,26 mmHg e 79,84 (± 9,82 mmHg para PAS e PAD, respectivamente. Na análise comparativa, a AMPA apresentou valores semelhantes aos da MAPA (p > 0,05 e diferentes da medida casual (p < 0,05. Na análise de correlação a AMPA foi superior à medida casual, considerando a MAPA como o padrão de referência nas medidas tensionais. CONCLUSÃO: A AMPA apresentou melhor comparação com a MAPA do que a medida casual e também se correlacionou melhor com a aquela, especialmente para a pressão diastólica, devendo ser considerada uma alternativa com baixo custo para o acompanhamento do paciente hipertenso.

  4. Soft X-ray multilayers and filters

    CERN Document Server

    Wang Zhan Shan; Tang Wei Xing; Qin Shuji; Zhou Bing; Chen Ling Ya

    2002-01-01

    The periodic and non-periodic multilayers were designed by using a random number to change each layer and a suitable merit function. Ion beam sputtering and magnetron sputtering were used to fabricate various multilayers and beam splitters in soft X-ray range. The characterization of multilayers by small angle X-ray diffraction, Auger electron spectroscopy, Rutherford back scattering spectroscopy and reflectivity illustrated the multilayers had good structures and smooth interlayers. The reflectivity and transmission of a beam splitter is about 5%. The fabrication and transmission properties of Ag, Zr were studied. The Rutherford back scattering spectroscopy and auger electron spectroscopy were used to investigate the contents and distributions of impurities and influence on qualities of filters. The attenuation coefficients were corrected by the data obtained by measurements

  5. Soroprevalência de infecção chagásica em área de Triatoma infestans após medidas de controle

    Directory of Open Access Journals (Sweden)

    Carvalho Maria Esther

    2000-01-01

    Full Text Available INTRODUÇÃO: Como parte de projeto que busca resgatar informações sobre sorologia da infecção chagásica no Estado de São Paulo durante a vigência das atividades oficiais de controle de vetores, foram selecionados dados relativos ao município de Taquarituba, região de Sorocaba, de importante passado chagásico. A despeito da campanha de combate instituída na década de 50, ainda persistiam aí populações de triatomíneos vetores intradomiciliares na década de 70. MÉTODOS: De amostras das populações de cinco localidades do Município de Taquarituba, Estado de São Paulo, foram analisados os dados de idade, sexo, tempo de moradia na casa que ocupavam e naturalidade. A possível relação entre idade e soropositividade foi investigada utilizando-se o cálculo de probitos. De 1974 e 1976, a prevalência da infecção chagásica foi estimada por meio de reação de imunofluorescência indireta (RIFI para a detecção de anticorpos anti-Trypanosoma cruzi. RESULTADOS: A proporção total de soropositivos foi de 13,6% (n = 2.784, sem diferença significativa entre os sexos (p = 0,538. Os naturais de Taquarituba contribuíram com 62,9% das amostras examinadas e 62,4% dos soropositivos (n = 380. Ausente em crianças de menos de 6 anos, a soropositividade aumentou de 2,7% no grupo etário de 6 a 9 anos para 30,3% no de 30 a 39 anos. Dentro desse intervalo encontrou-se, por meio do cálculo de probitos, associação positiva entre idade e soropositividade. CONCLUSÕES: Os resultados das provas sorológicas sugeriram haver associação entre as medidas contra Triatoma infestans e o declínio da transmissão da doença de Chagas durante os anos 60, seguido de ulterior controle. Sugere-se a realização de pesquisa para investigar a ocorrência de infecção congênita em população feminina com mais de 14 anos, sorologicamente positivas.

  6. Avaliação do Risco de Parto Prematuro: Teste da Fibronectina Fetal e Medida do Colo Uterino

    Directory of Open Access Journals (Sweden)

    Oliveira Tenilson Amaral

    2000-01-01

    Full Text Available Objetivo: avaliar o risco de parto prematuro em gestantes com antecedentes de parto pré-termo espontâneo por meio do teste da fibronectina fetal e da medida do colo uterino pela ultra-sonografia transvaginal. Métodos: foram relacionadas 107 gestantes na 24ª, 28ª e 32ª semana de gestação para realização do teste da fibronectina fetal no conteúdo cérvico- vaginal. No mesmo período, o comprimento do colo uterino foi medido, entre o orifício interno e externo, pela ultra-sonografia transvaginal. Consideramos o colo curto quando a medida da cérvice foi menor ou igual ao ponto de corte estabelecido pela curva ROC ("receiver-operating characteristic" para predição do parto prematuro. Comparamos o resultado dos exames com a ocorrência do parto antes de 34 e 37 semanas de gestação. Resultados: a incidência do parto prematuro foi de 37,4% (40/107. O melhor ponto de corte do comprimento do colo uterino indicado pela curva ROC para maximizar sensibilidade e especificidade foi 30 mm para 24 e 28 semanas de gestação e 25 mm para 32 semanas. O teste positivo da fibronectina fetal teve um risco relativo (RR significante apenas na 28ª semana (RR: 1,77; intervalo de confiança (IC 95%: 1,10-2,84 para a ocorrência do parto antes de 37 semanas. O colo curto mostrou um RR significativo para ocorrência do parto antes de 37 semanas, na 24ª, 28ª e 32ª semana. O RR foi mais elevado quando o colo curto esteve presente na 24ª semana para ocorrência do parto antes de 34 semanas (RR: 4,42; IC 95%: 1,25-15,56. Conclusão: em pacientes com antecedentes de prematuridade espontânea, a medida do comprimento do colo uterino por meio da ultra-sonografia transvaginal é melhor que o teste da fibronectina fetal para avaliar o risco de parto prematuro.

  7. Validez de criterio del test sit-and-reach como medida de la extensibilidad isquiosural en piragüistas

    Directory of Open Access Journals (Sweden)

    P.A. López-Miñarro

    2012-01-01

    Full Text Available Los objetivos del estudio fueron determinar la validez de criterio concurrente del test sit-and-reach como medida de la extensibilidad isquiosural en piragüistas, en función de la disciplina practicada (kayak o canoa, así como la validez de la inclinación pélvica evaluada mediante un Spinal Mouse. Un total de 51 canoístas y 60 kayakistas varones (media de edad: 17,53 ± 6,28 años realizaron de forma aleatoria los test de elevación de la pierna recta (EPR y sit-and-reach (SR. En este último se valoró la distancia alcanzada y la disposición del raquis torácico y lumbar, así como la inclinación pélvica mediante un Spinal Mouse. Se encontró una correlación moderada (r= 0,66-0,67 y moderada-baja (r= 0,59 entre el test SR y el test EPR en los canoístas y kayakistas, respectivamente. Las correlaciones de la inclinación pélvica con el test EPR fueron moderadas, siendo mayores en los canoístas (r= 0,68-0,71 que en los kayakistas (r= 0,57-0,63. La inclinación pélvica mostró valores más elevados de correlación respecto a la distancia alcanzada en el test SR en ambos grupos (r= 0,78 en kayakistas y r= 0,91 en canoístas. En conclusión, el test sit-and-reachno es una medida adecuada para la valoración de la extensibilidad isquiosural en piragüistas, especialmente en kayakistas. La inclinación pélvica valorada mediante un Spinal Mouse tampoco se puede considerar como una medida adecuada para la valoración de la extensibilidad isquiosural en piragüistas.

  8. Gamma ray generator

    Science.gov (United States)

    Firestone, Richard B; Reijonen, Jani

    2014-05-27

    An embodiment of a gamma ray generator includes a neutron generator and a moderator. The moderator is coupled to the neutron generator. The moderator includes a neutron capture material. In operation, the neutron generator produces neutrons and the neutron capture material captures at least some of the neutrons to produces gamma rays. An application of the gamma ray generator is as a source of gamma rays for calibration of gamma ray detectors.

  9. Cosmic Ray Propagation Models

    Science.gov (United States)

    Moskalenko, I. V.

    2004-01-01

    Astrophysics of cosmic rays and gamma rays depends very much on the quality of the data, which become increasingly accurate each year and therefore more constraining. While direct measurements of cosmic rays are possible in only one location on the outskirts of the Milky Way, the Galactic diffuse gamma-ray emission provides insights into the spectra of cosmic rays in distant locations, therefore complementing the local cosmic-ray studies. This connection, however, requires extensive modeling and is yet to be explored in detail. The GUST mission, which is scheduled for launch in 2007 and is capable of measuring gamma-rays in the range 20 MeV - 300 GeV, will change the status quo dramatically. Galactic diffuse gamma-ray emission gathered by GUST will require adequate theoretical models. The efforts will be rewarded by the wealth of information on cosmic ray spectra and fluxes in remote locations. In its turn, a detailed cosmic ray propagation model will provide a reliable basis for other studies such as search for dark matter signals in cosmic rays and diffuse gamma rays, spectrum and origin of the extragalactic gamma-ray emission, theories of nucleosynthesis and evolution of elements etc. In this talk, I will discuss what we can learn studying the cosmic ray propagation and diffuse gamma-ray emission.

  10. Transmission Electron Microscopy and Diffractometry of Materials (Third Edition)

    OpenAIRE

    Fultz, Brent; Howe, James M.

    2007-01-01

    This book explains concepts of transmission electron microscopy (TEM) and x-ray diffractometry (XRD) that are important for the characterization of materials. The third edition has been updated to cover important technical developments, including the remarkable recent improvement in resolution of the TEM. This edition is not substantially longer than the second, but all chapters have been updated and revised for clarity. A new chapter on high resolution STEM methods has been added. The book e...

  11. Phased Array Excitations For Efficient Near Field Wireless Power Transmission

    Science.gov (United States)

    2016-09-01

    aerial vehicle PEC perfect electrical conductor PO physical optics RF radio frequency SBR shooting and bouncing ray TE transverse electric TEM...analysis of near-field focusing for WPT, specifically in [2]. The WPT method was introduced in the 1960s for vehicle propulsion , and researchers from...Development of a Wireless Power Transmission System for a Micro Air Vehicle (MAV),” M.S. thesis, Dept. Elec. & Comp. Eng., Naval Postgraduate School

  12. Transmissible spongiform encephalopathies.

    Science.gov (United States)

    Liemann, S; Glockshuber, R

    1998-09-18

    Scrapie, bovine spongiform encephalopathy (BSE), and the Creutzfeldt-Jakob disease (CJD) belong to a group of lethal neurodegenerative disorders in mammals. Prion diseases or transmissible spongiform encephalopathies (TSEs) are characterized by the accumulation of an abnormal isoform (PrPSc) of the host-encoded cellular prion protein (PrPC) in the brain. The infectious agent, the 'prion,' is believed to be devoid of informational nucleic acid and to consist largely, if not entirely, of PrPSc. The PrP isoforms contain identical amino acid sequences yet differ in their overall secondary structure with the PrPSc isoform possessing a higher beta-sheet and lower alpha-helix content than PrPC. Elucidation of the three-dimensional structure of PrPC has provided important clues on the molecular basis of inherited human TSEs and on the species barrier phenomenon of TSEs. Nevertheless, the molecular mechanism of the conformational rearrangement of PrPC into PrPSc is still unknown, mainly due to the lack of detailed structural information on PrPSc. Within the framework of the 'protein only' hypothesis, two plausible models for the self-replication of prions have been suggested, the conformational model and the nucleation-dependent polymerization model.

  13. Thrips transmission of tospoviruses.

    Science.gov (United States)

    Rotenberg, Dorith; Jacobson, Alana L; Schneweis, Derek J; Whitfield, Anna E

    2015-12-01

    One hundred years ago, the disease tomato spotted wilt was first described in Australia. Since that time, knowledge of this disease caused by Tomato spotted wilt virus (TSWV) and transmitted by thrips (insects in the order Thysanoptera) has revealed a complex relationship between the virus, vector, plant host, and environment. Numerous tospoviruses and thrips vectors have been described, revealing diversity in plant host range and geographical distributions. Advances in characterization of the tripartite interaction between the virus, vector, and plant host have provided insight into molecular and ecological relationships. Comparison to animal-infecting viruses in the family Bunyaviridae has enabled the identification of commonalities between tospoviruses and other bunyaviruses in transmission by arthropod vectors and molecular interactions with hosts. This review provides a special emphasis on TSWV and Frankliniella occidentalis, the model tospovirus-thrips pathosystem. However, other virus-vector combinations are also of importance and where possible, comparisons are made between different viruses and thrips vectors. Copyright © 2015 Elsevier B.V. All rights reserved.

  14. Control of schistosomiasis transmission

    Directory of Open Access Journals (Sweden)

    Luiz C. de S. Dias

    1995-04-01

    Full Text Available Despite the success of control programmes, schistosomiasis is still a serious public health problem in the world. More than 70 countries where 200 million individuals are evaluated to be infected of a total 600 million at risk. Though there have been important local success in the control of transmission, globally the infection has increased. Economic constrains in developing countries, environmental changes associated with migration and water resources development have been blocking the progress. The main objective of schistosomiasis control is to achieve reduction of disease due to schistosomiasis. We discussed the control measures like: health education, diagnosis and chemotherapy, safe water supplies, sanitation and snail control. We emphasized the need to give priority to school-age children and the importance of integrating the measures of control into locally available systems of health care. The control of schistosomiasis is directly related to the capacity of the preventive health services of an endemic country. The strategy of control requires long-term commitment from the international to the local level.

  15. Medida das capacidades psicomotoras envolvidas na técnica da injeção intramuscular

    Directory of Open Access Journals (Sweden)

    Ana Maria Kazue Miyadahira

    1992-12-01

    Full Text Available Partindo-se do pressuposto de que no estudo de habilidades psicomotoras, a medida das capacidades motoras é fundamental, apresentam-se dois testes passíveis de serem utilizados pila enfermagem. Esses testes, denominados "psicomotor eletrônico" e "perfuragem" foram aplicados na primeira etapa do estudo sobre o processo de ensino-aprendizagem de habilidades psicomotoras no qual analisou-se a técnica de injeção intramuscular. Três grupos de estudantes de graduação em enfermagem, em diferentes estágios de desenvolvimento no curso, foram avaliados e verificou-se que eles eram homogêneos em relação às capacidades psicomotoras testadas.

  16. ÁGUA TRATAMENTO E DISTRIBUIÇÃO: DESPERDÍCIO E MEDIDAS DE CONTENÇÃO

    OpenAIRE

    Henkes, Jairo Afonso; Freitas, Everton Emerich de

    2015-01-01

    Este estudo de caso tem a contínua importância de analisar as formas para conser-var um importante recurso natural, a água, após tratamento e na fase de distribuição, por meio de medidas de contenção de desperdício pelo sistema de abastecimento público do município de Mangaratiba. Quando o manancial de abastecimento for pe-queno isolado e fragmentado se faz a necessidade de implementar um programa de redução de perdas incorporar técnicas necessárias a fim de aprimorar o melhor de-sempenho do ...

  17. Medidas contractuales y legislativas adoptadas para incrementar la confianza del consumidor y usuario en el comercio electrónico

    Directory of Open Access Journals (Sweden)

    David López Jiménez

    2008-12-01

    Full Text Available El comercio electrónico representa una actividad en auge. Sin embargo, existen ciertos factores que impiden su despegue y efectiva consolidación. Uno de ellos es, precisamente, la falta de confianza del potencial consumidor y/o usuario, si bien, recientemente, hemos sido testigos de la creación de ciertos instrumentos, los códigos de conducta, que buscan mitigar y, en cierta medida, erradicar los factores que causan desconfianza a través de una mejora relativamente significativa de la normativa legal aplicable. Consciente de las importantes ventajas que tales textos suponen, en la práctica, para los consumidores y/o usuarios el legislador estatal aprobó el RD 1163/2005, de 30 de septiembre, por el que se regula el Distintivo Público de Confianza en Línea para distinguir aquellos especialmente garantistas en materia de comercio electrónico.

  18. Análisis jurídico de los paraisos fiscales y medidas para evitar sus efectos

    OpenAIRE

    Gutiérrez de Pablo, Gonzalo

    2017-01-01

    La tesis trata de una aproximación al fenómeno de los paraísos fiscales. Se puede dividir en dos partes en la primera se realiza un análisis actual e histórico del problema, se trata la definición de paraíso fiscal, y de las estrategias seguidas por los usuarios en cuanto a su utilización, instrumentos y formas en que se lleva a cabo, para y terminar con un comentario de los principales países de baja tributación. La segunda parte trata de las medidas adoptadas por el legislador español, y po...

  19. Exposición humana a las radiaciones electromagnéticas no ionizantes. Legislación y medidas de estaciones base

    Directory of Open Access Journals (Sweden)

    Alonso Alonso Alonso

    2004-12-01

    Full Text Available Este trabajo trata sobre los procedimientos de medida de las radiaciones no ionizantes y sus niveles registrados en medidas reales. Las fuentes de radiación analizadas cubren los medios de radiodifusión más corrientes, tales como las transmisiones AM y FM y también las estaciones base de telefonía móvil GSM. Estas fuentes habitualmente radian sobre áreas con alta densidad de población. Se describe brevemente el marco legal que regula los niveles de radiación en España y se señalan algunas posibles mejoras. Se valorarán los resultados encontrados en las medidas.

  20. Variabilidad en las medidas de tensión arterial realizada por estudiantes de 5.º y 6.º de medicina

    Directory of Open Access Journals (Sweden)

    C. Caramelo

    Full Text Available Introducción. No se ha definido objetivamente si los estudiantes de medicina avanzados dominan destrezas básicas, como la medida de tensión arterial. Sujetos y métodos. Se determinó la variabilidad de medida de tensión arterial por estudiantes de 5.º y 6.º cursos de medicina. Resultados. Se encontraron coeficientes de variación significativamente más elevados en la tensión arterial diastólica derecha y frecuencia cardíaca, y grupos e individuos con error sistemático de medición. Conclusión. Resulta necesario un refuerzo docente en la medida de tensión arterial diastólica y su realización en los dos brazos.

  1. Estimación del error en la medida del factor de ensanchamiento de línea en láseres de semiconductor

    OpenAIRE

    Consoli Barone, Antonio; Garcia Tijero, Jose Manuel; Esquivias Moscardo, Ignacio

    2013-01-01

    En el presente trabajo se propone un método para la medida y la estimación del error de la misma en la caracterización del factor de ensanchamiento de línea (parámetro α) de los láseres de semiconductor. La técnica propuesta se basa en el cálculo del parámetro α a partir de la medida de la intensidad y de la frecuencia instantánea de los pulsos generados por un laser de semiconductor conmutado en ganancia. El error de medida se estima mediante la comparación entre el espectro medido y el reco...

  2. Aplicação de medidas cefalométricas em 3D-TC: Application of cephalometric measurements in 3D-TC

    Directory of Open Access Journals (Sweden)

    Patrícia de Medeiros Loureiro Lopes

    2007-01-01

    Full Text Available OBJETIVO: o objetivo desta pesquisa foi avaliar a precisão e acurácia (validade de medidas cefalométricas lineares em imagens reconstruídas em terceira dimensão (3D, pela técnica de volume, a partir da tomografia computadorizada (TC multislice. METODOLOGIA: o material da pesquisa consistiu de 10 (dez crânios secos, previamente selecionados, sem distinção de etnia ou gênero, os quais foram submetidos à TC multislice 16 cortes com 0,5mm de espessura por 0,3mm de intervalo de reconstrução. Posteriormente, os dados obtidos foram enviados para uma estação de trabalho independente, contendo o programa Vitrea®. Os pontos cefalométricos (n=13 foram localizados e as respectivas medidas ósseas lineares (n=15 foram realizadas por 2 examinadores, previamente treinados, medindo cada um duas vezes, independentemente, em 3D. As medidas físicas foram obtidas por um terceiro examinador, utilizando um paquímetro digital. A análise dos dados foi realizada mediante um estudo comparativo entre as medidas inter e intra-examinadores, em 3D-TC, e entre estas e as medidas físicas obtidas diretamente nos crânios, utilizando ANOVA (análise de variância. RESULTADOS: não foram encontradas diferenças estatisticamente significantes entre os valores das medidas inter e intra-examinadores, nem entre as medidas físicas e em 3D, com p>0,6 para todas as medidas. O erro percentual foi de 2,05% para as medidas interexaminadores e de 2,11% para as medidas intra-examinadores. A média do erro percentual entre as medidas físicas e em 3D variou de 0,96% a 1,47%. CONCLUSÃO: todas as medidas cefalométricas lineares foram consideradas precisas e acuradas utilizando a técnica de volume em 3D por meio da TC multislice.AIM: To test the precision and accuracy of conventional linear cephalometric measurements in 3D reconstructed images using a multislice CT. METHODS: The study population consisted of 10 dry skulls, previously selected, without distinction of

  3. Diseño y puesta en marcha de un banco de medidas de dispersión a frecuencias ópticas

    OpenAIRE

    Moral Cerezo, Fernando; Ferrer Picon, Xavier

    2009-01-01

    Estudio de la dispersión a frecuencias ópticas, de los conceptos relacionados y de los métodos existentes para su medida y caracterización. Estudio de las características de los dispositivos que forman el montaje básico del método de medida MPSM (Modulation Phase Shift Method) y de otros métodos derivados de éste. Diseño a partir de los dispositivos disponibles en el laboratorio del D3 de un banco de pruebas de métodos de medida de dispersión a frecuencias ópticas. Determinación del espectro ...

  4. Genetic transmission of reading ability

    NARCIS (Netherlands)

    Swagerman, Suzanne C.; Van Bergen, Elsje; Dolan, Conor; de Geus, Eco J. C.; Koenis, Marinka M.G.; Hulshoff Pol, Hilleke E.; Boomsma, Dorret I.

    2017-01-01

    Reading is the processing of written language. Family resemblance for reading (dis)ability might be due to transmission of a genetic liability or due to family environment, including cultural transmission from parents to offspring. Familial-risk studies exploring neurobehavioral precursors for

  5. Hendra virus ecology and transmission.

    Science.gov (United States)

    Field, Hume E

    2016-02-01

    Hendra virus causes acute and highly fatal infection in horses and humans. Pteropid bats (flying-foxes) are the natural host of the virus, with age and species being risk factors for infection. Urine is the primary route of excretion in flying-foxes, with viral RNA more frequently detected in Pteropus alecto and P. conspicillatus than other species. Infection prevalence in flying-foxes can vary between and within years, with a winter peak of excretion occurring in some regions. Vertical transmission and recrudescing infection has been reported in flying-foxes, but horizontal transmission is evidently the primary mode of transmission. The most parsimonious mode of flying-fox to horse transmission is equine contact (oro-nasal, conjunctival) with infected flying-fox urine, either directly, or via urine-contaminated pasture or surfaces. Horse to horse transmission is inefficient, requiring direct contact with infected body fluids. Flying-fox to human transmission has not been recorded; all human cases have been associated with close and direct contact with infected horses. Canine cases (subclinical) have also been limited to equine case properties. Notwithstanding the recent availability of an effective vaccine for horses, a comprehensive understanding of Hendra virus ecology and transmission is essential to limit inter-species transmission. Copyright © 2016 Elsevier B.V. All rights reserved.

  6. A Quantitative Transmission Line Experiment

    Science.gov (United States)

    Johnston, D. C.; Silbernagel, B. G.

    1969-01-01

    Describes modifications of a commercially available strip-type transmission line, which makes possible reproducible measurements of standing waves on the line. Experimental data yield values for the characteristic impedance, phase velocity and line wavelength of radiation in the transmission line, and the dielectric constant of material in the…

  7. HVDC power transmission technology assessment

    Energy Technology Data Exchange (ETDEWEB)

    Hauth, R.L.; Tatro, P.J.; Railing, B.D. [New England Power Service Co., Westborough, MA (United States); Johnson, B.K.; Stewart, J.R. [Power Technologies, Inc., Schenectady, NY (United States); Fink, J.L.

    1997-04-01

    The purpose of this study was to develop an assessment of the national utility system`s needs for electric transmission during the period 1995-2020 that could be met by future reduced-cost HVDC systems. The assessment was to include an economic evaluation of HVDC as a means for meeting those needs as well as a comparison with competing technologies such as ac transmission with and without Flexible AC Transmission System (FACTS) controllers. The role of force commutated dc converters was to be assumed where appropriate. The assessment begins by identifying the general needs for transmission in the U.S. in the context of a future deregulated power industry. The possible roles for direct current transmission are then postulated in terms of representative scenarios. A few of the scenarios are illustrated with the help of actual U.S. system examples. non-traditional applications as well as traditional applications such as long lines and asynchronous interconnections are discussed. The classical ``break-even distance`` concept for comparing HVDC and ac lines is used to assess the selected scenarios. The impact of reduced-cost converters is reflected in terms of the break-even distance. This report presents a comprehensive review of the functional benefits of HVDC transmission and updated cost data for both ac and dc system components. It also provides some provocative thoughts on how direct current transmission might be applied to better utilize and expand our nation`s increasingly stressed transmission assets.

  8. A transmission line phase stabilizer

    Science.gov (United States)

    Lutes, G. F.

    1979-01-01

    To meet the phase stability requirements of certain experiments performed with the Deep Space Network, transmission lines carrying reference signals must be stabilized to reduce changes in their electrical length due to mechanical movement or changes in ambient temperature. A transmission line phase stabilizer being developed at JPL to perform this function is described.

  9. Medida da cor em solos do Rio Grande do Sul com a carta de Munsell e por colorimetria

    Directory of Open Access Journals (Sweden)

    Botelho Márcio Ramos

    2006-01-01

    Full Text Available A cor do solo é uma característica facilmente determinada através da comparação visual com a carta de Munsell e está relacionada com a presença de óxidos de ferro e matéria orgânica no solo. A obtenção da cor por instrumentos via sensoriamento remoto, como colorímetros, resulta em maior precisão por apresentar condições controladas e não subjetivas. Os objetivos deste trabalho foram comparar a cor de diferentes solos do Rio Grande do Sul determinadas pela carta de Munsell e por colorimetria e correlacioná-las com os atributos do solo. A precisão dos observadores na determinação da cor através da carta de Munsell para uma mesma amostra apresentou menor variabilidade para o componente matiz e maior para o croma. Os coeficientes de correlação mostraram que há coerência entre as medidas de cor realizadas por diferentes observadores e as medidas pelo colorímetro, o qual mostrou ser eficiente na quantificação da cor, eliminando possíveis erros psicofísicos atribuídos ao método visual. Os atributos dos solos analisados apresentaram boas correlações com os componentes da cor obtidos por colorimetria, mostrando ser esta uma técnica eficiente e promissora para obter informações do solo de maneira simples e de baixo custo.

  10. Medida Socioeducativa de Internação: dos Corpos Dóceis às Vidas Nuas

    Directory of Open Access Journals (Sweden)

    Andrea Cristina Coelho Scisleski

    Full Text Available O presente artigo tem como objetivo a problematização dos modos pelos quais a tecnologia disciplinar, presente nas medidas socioeducativas de internação direcionadas aos jovens em conflito com a lei, vem sendo operacionalizada. Tomamos como fio condutor as reflexões de Michel Foucault e Giorgio Agamben para problematizar a vida enquanto objeto político a ser governado para determinado fim e que sofre intervenções não apenas para seu fortalecimento, mas que levam à desproteção jurídica e à morte política, ou mesmo biológica. A investigação se desenvolveu em três momentos metodológicos: oitiva de audiências na Vara da Infância e da Juventude, visita a uma unidade educacional de internação e leitura de processos jurídicos e das normativas legais voltadas para a população em questão. Assim, por meio do que encontramos na pesquisa, entende-se que a tecnologia disciplinar, do modo que vem sendo utilizada nas medidas socioeducativas de internação, assemelha-se mais a um dispositivo de controle com o objetivo meramente de docilizá-los, reduzindo o sujeito à vida nua; isto é, como mero corpo biológico que sofre efeitos de uma ação, do que propriamente um método socioeducativo como estabelecem o Estatuto da Criança e do Adolescente e o Sistema Nacional de Atendimento Socioeducativo.

  11. Contrabando, ilegalidade e medidas políticas no Rio de Janeiro do século XVIII

    Directory of Open Access Journals (Sweden)

    Ernst Pijning

    2001-01-01

    Full Text Available O presente artigo estuda o contrabando no século XVIII, em especial em relação ao Rio de Janeiro e ao Atlântico Sul. Neste artigo discuto não apenas a mecânica do contrabando e os participantes deste comércio ilegal, mas os vários fatores que ocasionaram as medidas portuguesas, metropolitanas e coloniais para impedir o comércio clandestino. Estudo particularmente como tais medidas representaram um compromisso entre diferentes interesses, tais como: o papel do monarca, a integridade ou a maleabilidade da autoridade real, a aplicação dessa legislação e os tipos de penalidades impostas aos infratores, trazendo questões sobre o que constituíam ações legais ou ilegais, assim como questões mais amplas relativas à ética e à moralidade pública no Brasil colônia.This article focuses on contraband in the eighteenth century, with special reference to Rio de Janeiro and the South Atlantic. It discusses not merely the mechanics of contraband and the participants in this illegal trade, but the many factors that contributed to Portuguese metropolitan and colonial measures to curb clandestine trade. I am particularly intrigued by the degree to which such measures represented a compromise between different interests. The role of the monarch, the integrity or malleability of royal authority, the latitude in enforcement of such legislation and the range of penalties imposed on infractors raise questions as to what constituted legal or illegal actions, as well as broader issues of ethics and public morality in colonial Brazil.

  12. Análise de desempenho de medidas estruturais e não estruturais de controle de inundações em uma bacia urbana

    Directory of Open Access Journals (Sweden)

    Thiago Galvão Tiradentes Decina

    2016-03-01

    Full Text Available RESUMO Este trabalho teve como objetivo analisar, por meio de simulações hidrológicas e hidráulicas, o desempenho de algumas medidas de controle de inundação, estruturais e não estruturais. Para tanto, os mapas e demais informações espaciais da bacia hidrográfica do Córrego do Gregório, em São Carlos (SP, foram digitalizadas com auxílio do software de geoprocessamento ArcGIS(r e imagens de satélite de alta resolução. Com base nessas informações, foram propostos cenários alternativos que incorporaram as medidas de controle. Através da utilização dos softwares HEC-HMS e HEC-RAS realizaram-se as modelações hidráulicas e hidrológicas, utilizando tempos de retorno de 25, 50 e 100 anos para a chuva de projeto. Com os resultados obtidos (hidrogramas de cheia e manchas de inundação referentes a cada tempo de retorno, foi possível analisar as medidas, comparando-se os diferentes cenários. Concluiu-se, para este caso, que os melhores resultados correspondem à associação das medidas estruturais e não estruturais. Contudo, também foi verificado que, mesmo com a concretização do cenário mais favorável, o problema das inundações não seria satisfatoriamente equacionado, o que revela a necessidade de se considerar outras medidas para minimizar os prejuízos decorrentes das inundações, tais como medidas de controle na fonte, seguros contra inundações e sistemas de alerta antecipados.

  13. Tecnicas avanzadas de medida en intensimetria acustica para la caracterizacion de materiales aislantes

    Science.gov (United States)

    Munuera Saura, Gregorio

    main advantage of the described test procedure is that it can be done in a room with normal dimensions and without specific conditioning. The vibroacoustic behaviour of the testing box and its influence on the measures is another important aspect to be considered. A test of modal analysis has been carried out with a steel plate similar to the enclosures of the box. A mathematical model based on the Statistical Energy Analysis SEA has been developed to estimate the paths of energy transmission from the sound source to the point of measurement with the sound intensity probe. The commercial software AUTOSEA2 LT is used. General conclusions regarding the alternative method of measurement and specific ones related to the capacity of insulation of the tested materials have been obtained. As for the general conclusions, the limitations of measuring with the intensity probe at low and high frequencies have been proved, validating measurements with an accuracy of 0.5 dB according to the criteria set forth in the standard UNE EN ISO 9614 Part 3 have been obtained, and a new test procedure for easy determination of the rate of acoustic reduction of an insulating material with low density surface has been established. Finally, the devised procedure allows future developments in the field of vibroacoustics, such as the application of the principle of reciprocity and the determination of acoustic impedance of materials by application of techniques for measuring of acoustics intensity.

  14. Ray tracing in a turbulent, shallow-water channel

    DEFF Research Database (Denmark)

    Bjerrum-Niese, Christian; Lützen, René; Jensen, Leif Bjørnø

    1998-01-01

    A ray tracing model can be used to simulate sound (10–100 kHz) transmitted through shallow water. The phase of the ray arrivals, primarily given by travel time, may be mutually independent in such a multipath transmission. Consequently, the transmission loss in a receiving point is randomly valued...... due to the coherent interference of the multipath arrivals. This problem can be overcome by incoherent summation of the multipath arrivals. However, knowing that nature behaves coherently, this method is not preferred. Instead, the channel can be regarded as dynamic by allowing microfluctuations...

  15. Regional Transmission Projects: Finding Solutions

    Energy Technology Data Exchange (ETDEWEB)

    The Keystone Center

    2005-06-15

    The Keystone Center convened and facilitated a year-long Dialogue on "Regional Transmission Projects: Finding Solutions" to develop recommendations that will help address the difficult and contentious issues related to expansions of regional electric transmission systems that are needed for reliable and economic transmission of power within and across regions. This effort brought together a cross-section of affected stakeholders and thought leaders to address the problem with the collective wisdom of their experience and interests. Transmission owners sat at the table with consumer advocates and environmental organizations. Representatives from regional transmission organizations exchanged ideas with state and federal regulators. Generation developers explored common interests with public power suppliers. Together, the Dialogue participants developed consensus solutions about how to begin unraveling some of the more intractable issues surrounding identification of need, allocation of costs, and reaching consensus on siting issues that can frustrate the development of regional transmission infrastructure. The recommendations fall into three broad categories: 1. Recommendations on appropriate institutional arrangements and processes for achieving regional consensus on the need for new or expanded transmission infrastructure 2. Recommendations on the process for siting of transmission lines 3. Recommendations on the tools needed to support regional planning, cost allocation, and siting efforts. List of Dialogue participants: List of Dialogue Participants: American Electric Power American Transmission Company American Wind Energy Association California ISO Calpine Corporation Cinergy Edison Electric Institute Environmental Defense Federal Energy Regulatory Commission Great River Energy International Transmission Company ISO-New England Iowa Public Utility Board Kanner & Associates Midwest ISO National Association of Regulatory Utility Commissioners National Association

  16. Utilidad de la medida de flujo de savia como indicador de la tasa de transpiración en plantas de pepino

    OpenAIRE

    Egea Cegarra, Gregorio; Nortes Tortosa, Pedro Antonio; Baille, Alain Daniel; Martín Górriz, Bernardo; González Real, María Milagros

    2009-01-01

    El método del balance de calor para la determinación del flujo de savia es particularmente adecuado para especies vegetales con pequeños tallos. Sin embargo, se desconoce en qué medida el flujo de savia medio en la base del tallo realmente reproduce los cambios rápidos de transpiración que se producen ante variaciones bruscas de las condiciones medioambientales. En este estudio, se compararon medidas de transpiración foliar obtenidas mediante un método no invasivo (balance de energía a nivel ...

  17. Medidas tecnológicas de protección en el tratado de libre comercio con los Estados Unidos de Norteamérica

    OpenAIRE

    Jhonny Antonio Pabón Cadavid

    2007-01-01

    Las medidas tecnológicas de protección de contenidos tutelados por el derecho de autor, gracias a los tratados internacionales de 1996 de la ompi son objeto obligatorio de protección jurídica, en Colombia la legislación que ha abordado el tema ha sido de forma exclusiva la penal. El tratado de libre comercio con los Estados Unidos, en el marco de los aadpic aumentados, establece normas relacionadas con las medidas tecnológicas de protección que replican el modelo de la dmca de 1998. Un tema q...

  18. Medida de la temperatura con conexión directa sensor-microcontrolador para estación marítima

    OpenAIRE

    SISCAR ESCRIVÀ, XAVIER RAMÓN

    2013-01-01

    En el presente trabajo se ha diseñado e implementado un sistema de medida de la temperatura para una estación marina, usando una interfaz de conexión directa sensor-microcontrolador. El sistema se basa en un sensor resistivo para medir la temperatura, un microcontrolador para procesar los datos y una memoria donde se almacenan. La interfaz de conexión directa sensormicrocontrolador permite realizar medidas de manera más rápida y con menor consumo respecto al uso de convertidore...

  19. Impactos de medidas “antidumping” adotadas pelos EUA sobre o setor siderúrgico de Minas Gerais e o restante do Brasil

    OpenAIRE

    Vinícius de Azevedo Couto Firme; Claudio Vasconcelos

    2012-01-01

    Analisar o impacto de medidas antidumping aplicadas pelos Estados Unidos sobre exportações do setor siderúrgico de Minas Gerais, para o período entre 1999 e 2002, foi o objetivo deste trabalho. Os resultados mostraram que tal medida teve efeitos estatisticamente significativos sobre a redução no fluxo de comércio. Na análise da integração dos resultados econométricos com a abordagem de matrizes inter-regionais de insumo-produto, foi possível concluir que o setor mais afetado, no que se refere...

  20. Evaluación de resultados del programa de sensibilización y reducación para una movilidad segura como medida penal alternativa

    OpenAIRE

    Pagés-Mimó, Adrià

    2016-01-01

    El programa formativo de sensibilización y reeducación para una movilidad segura como medida penal alternativa,implementado por la Cátedra de Educación y Formación Viaria y el Equipo de Investigación en Educación y Seguridad Viarias (ERESv) del Departamento de Pedagogía Aplicada de la Universidad Autónoma de Barcelona en colaboración con la Subdirección General de Medio Abierto y Medidas Penales Alternativas del Departamento de Justicia de la Generalitat de Catalunya y el Servicio Catalán de ...

  1. Evidencias sobre las medidas no farmacológicas en el control de la presión arterial en adultos

    OpenAIRE

    Ibáñez Gutiérrez, Francisco

    2014-01-01

    El número de personas afectadas por hipertensión arterial asciende a más de mil millones en todo el mundo, aumentando su prevalencia a medida que la población envejece. Datos recientes provenientes del estudio Framingham sugieren que el 90% de los individuos que tienen la presión arterial normal a los 55 años desarrollaran hipertensión en algún momento de su vida. Las medidas no farmacológicas son uno de los pilares centrales en los que se debe fundamentar la prevención y el...

  2. Diseño y automatización de un sistema de medida para la caracterización del canal radio en interiores

    OpenAIRE

    MARTÍNEZ TOVAL, SANTIAGO

    2017-01-01

    Partiendo de un analizador de redes vectorial y de un sistema de posicionamiento XY, se procederá al diseño y automatización de un sistema de medidas que permita la caracterización del canal radio en interiores a partir de la media del perfil de retardo de potencia. Martínez Toval, S. (2016). Diseño y automatización de un sistema de medida para la caracterización del canal radio en interiores. http://hdl.handle.net/10251/80421. TFGM

  3. La información mútua como medida de asociación y su utilidad en análisis genéticos

    OpenAIRE

    Cortés de la Fuente, Jorge

    2011-01-01

    La información mutua (MI) es una medida general de asociación entre variables que detecta tanto relaciones lineales como no lineales. Esta medida puede ser muy útil en análisis genéticos, donde los genes pueden interactuar entre ellos de una manera no lineal. En este trabajo se lleva a cabo una estimación de la información mutua basada en métodos de kernel, empleándose un algoritmo que permite reducir el coste computacional. La significación estadística de los estimadores se evalúa a part...

  4. Medidas psicofísicas e eletrofisiológicas da função visual do recém nascido: uma revisão

    Directory of Open Access Journals (Sweden)

    Marcelo Fernandes da Costa

    2006-01-01

    Full Text Available O sistema visual apresenta muitas funções ao nascimento. O processo de amadurecimento destas funções demanda um tempo variado. Neste trabalho, inicialmente descreveremos como a psicofísica e a eletrofisiologia visual tem colaborado para a medida e o estudo do desenvolvimento de três funções visuais: acuidade visual, sensibilidade ao contraste e visão de cores. Num segundo momento, discutimos sobre como a medida e o desenvolvimento destas funções podem estar prejudicados em patologias que afetam o sistema visual, como a prematuridade e a paralisia cerebral.

  5. Prácticas de Física: Medida de magnitudes eléctricas. Amperímetro y voltímetro

    OpenAIRE

    Beléndez,Augusto; Bernabeu, Guillermo; Vera Guarinos, Jenaro; Pastor Antón, Carlos; Martín García, Agapito

    1988-01-01

    Esta práctica pretende, como primer objetivo, la determinación de intensidades con un amperímetro. Posteriormente se aprende a aumentar el rango de medida y a la determinación de la resistencia interna. En primer lugar el alumno se familiariza con la medida de intensidades mediante un amperímetro utilizando un circuito sencillo, con una pila, un amperímetro y una resistencia en serie, verificando la ley de Ohm. Para poder medir intensidades superiores al rango del amperímetro será necesario c...

  6. Una medida de la teoría de los conjuntos aproximados para sistemas de decisión con rasgos de dominio continuo

    OpenAIRE

    Yaima Filiberto; Rafael Bello; Yailé Caballero; Rafael Larrua

    2011-01-01

    La Teoría de los conjuntos aproximados ofrece diversas medidas y técnicas para el análisis de datos, especialmente en el caso de problemas donde el rasgo de decisión tiene dominio discreto. En este artículo se propone una medida y métodos basados en ella que permiten extender la aplicabilidad de esta teoría para el caso de problemas donde los rasgos tienen dominio continuo, especialmente el rasgo de decisión. Los estudios experimentales realizados muestran su efectividad.

  7. As medidas protetivas na perspectiva de famílias em situação de violência sexual

    OpenAIRE

    Santos,Viviane Amaral dos; Costa,Liana Fortunato; Silva, Aline Xavier da

    2011-01-01

    Este texto apresenta os resultados de uma pesquisa realizada com cinco famílias que vivenciaram situação de violência sexual contra crianças e adolescentes, decorrido um ano ou mais de terem recebido aplicação de medidas protetivas provenientes do Estatuto da Criança e do Adolescente. O instrumento utilizado foi uma entrevista semiestruturada com seis mulheres, familiares das vítimas. Os resultados revelaram que decorrido um ano da aplicação das medidas protetivas, quatro das cinco famílias a...

  8. Energy Transmission and Infrastructure

    Energy Technology Data Exchange (ETDEWEB)

    Mathison, Jane

    2012-12-31

    The objective of Energy Transmission and Infrastructure Northern Ohio (OH) was to lay the conceptual and analytical foundation for an energy economy in northern Ohio that will: • improve the efficiency with which energy is used in the residential, commercial, industrial, agricultural, and transportation sectors for Oberlin, Ohio as a district-wide model for Congressional District OH-09; • identify the potential to deploy wind and solar technologies and the most effective configuration for the regional energy system (i.e., the ratio of distributed or centralized power generation); • analyze the potential within the district to utilize farm wastes to produce biofuels; • enhance long-term energy security by identifying ways to deploy local resources and building Ohio-based enterprises; • identify the policy, regulatory, and financial barriers impeding development of a new energy system; and • improve energy infrastructure within Congressional District OH-09. This objective of laying the foundation for a renewable energy system in Ohio was achieved through four primary areas of activity: 1. district-wide energy infrastructure assessments and alternative-energy transmission studies; 2. energy infrastructure improvement projects undertaken by American Municipal Power (AMP) affiliates in the northern Ohio communities of Elmore, Oak Harbor, and Wellington; 3. Oberlin, OH-area energy assessment initiatives; and 4. a district-wide conference held in September 2011 to disseminate year-one findings. The grant supported 17 research studies by leading energy, policy, and financial specialists, including studies on: current energy use in the district and the Oberlin area; regional potential for energy generation from renewable sources such as solar power, wind, and farm-waste; energy and transportation strategies for transitioning the City of Oberlin entirely to renewable resources and considering pedestrians, bicyclists, and public transportation as well as drivers

  9. [Mentalization and attachment transmission].

    Science.gov (United States)

    Böhmann, Johann; Fritsch, Sophia; Lück, Monika; Stumpe, Anna; Taubner, Svenja; Vesterling, Christina

    2014-01-01

    The present study was investigating the predictive role of maternal mentalizing and general as well as depressive symptom burden for attachment security at the end of the first year on a sample of 44 mother-child-dyads from a low-risk community study. Maternal mentalizing was assessed in a multidimensional way as Reflective Functioning (off-line) and Mind-Mindedness (on-line). The design was longitudinal measuring maternal Mind-Mindedness from a videotaped mother-child-play-interaction at the age of three months. General and depressive symptom burden was assessed using the SCL-90-R when the children were nine months old. Maternal attachment and Reflective-Functioning, using the Adult-Attachment-Interview, as well as children's attachment behavior, using the Strange-Situation-Test, were investigated at the age of twelve months. Secure maternal attachment was associated with higher Reflective Functioning, higher frequency of Mind-Mindedness and lower general and depressive symptom burden. A moderation-analysis showed a statistical trend (p = .08) that the interaction of the frequency of mind-related comments, general symptom severity and maternal attachment has a predictive value for infantile attachment security. Results can be tentatively interpreted that mothers with insecure attachment who had a lower general symptom burden and who related to their three-months old babies with a high frequency of mind-related-comments were more likely to have securely attached children. Thus, results may serve as a groundwork for projects aiming to prevent the transmission of insecure attachment by strengthening maternal Mind-Mindedness and working on the reduction of maternal general symptom burden.

  10. Gamma-ray Astronomy

    OpenAIRE

    Pohl, Martin

    2007-01-01

    This paper summarizes recents results in gamma-ray astronomy, most of which were derived with data from ground-based gamma-ray detectors. Many of the contributions presented at this conference involve multiwavelength studies which combine ground-based gamma-ray measurements with optical data or space-based X-ray and gamma-ray measurements. Besides measurements of the diffuse emission from the Galaxy, observations of blazars, gamma-ray bursts, and supernova remnants this paper also covers theo...

  11. Fabrication process for a gradient index x-ray lens

    Science.gov (United States)

    Bionta, Richard M.; Makowiecki, Daniel M.; Skulina, Kenneth M.

    1995-01-01

    A process for fabricating high efficiency x-ray lenses that operate in the 0.5-4.0 keV region suitable for use in biological imaging, surface science, and x-ray lithography of integrated circuits. The gradient index x-ray optics fabrication process broadly involves co-sputtering multi-layers of film on a wire, followed by slicing and mounting on block, and then ion beam thinning to a thickness determined by periodic testing for efficiency. The process enables the fabrication of transmissive gradient index x-ray optics for the 0.5-4.0 keV energy range. This process allows the fabrication of optical elements for the next generation of imaging and x-ray lithography instruments m the soft x-ray region.

  12. Filters for soft X-ray solar telescopes

    Science.gov (United States)

    Spiller, Eberhard; Grebe, Kurt; Golub, Leon

    1990-01-01

    Soft X-ray telescopes require filters that block visible and infrared light and have good soft X-ray transmission. The optical properties of possible materials are discussed, and the fabrication and testing methods for the filters used in a 10-inch normal incidence telescope for 63 A are described. The best performances in the 44-114-A wavelength range are obtained with foils of carbon and rhodium.

  13. The evolution of plant virus transmission pathways

    Science.gov (United States)

    Frédéric M. Hamelin; Linda J.S. Allen; Holly R. Prendeville; M. Reza Hajimorad; Michael J. Jeger

    2016-01-01

    The evolution of plant virus transmission pathways is studied through transmission via seed, pollen, oravector. We address the questions: under what circumstances does vector transmission make pollen transmission redundant? Can evolution lead to the coexistence of multiple virus transmission pathways? We restrict the analysis to an annual plant population in which...

  14. Transmission-Line Metamaterials, Bianisotropy, and Transmission-Line Bianisotropy

    OpenAIRE

    Vehmas, Joni

    2015-01-01

    Electromagnetic metamaterials are artificial composite materials which possess exotic and advantageous properties not attainable with natural materials. This thesis covers two notable classes of metamaterials: transmission-line metamaterials and bianisotropic media. While metamaterials are most commonly realized as bulk media consisting of small resonant inclusions, transmission-line structures offer an alternative, low-dispersion and low-loss way for realizing them. Bianisotropic media, on t...

  15. Midwest Transmission Workshop I Summary

    Energy Technology Data Exchange (ETDEWEB)

    Kevin Bryan

    2001-05-01

    OAK-B135 The meeting was opened with a review of the purposes of the workshop: (1) Present and discuss key studies and assessments of transmission upgrades, additions and related issues for the upper Midwest, including work that addresses the full range of views on these topics; (2) Understand the various transmission issues in the upper Midwest and discuss options for addressing the issues; and (3) Identify the decision makers and entities that need to play an active role if transmission issues are to be resolved, and agree on next steps for engaging these individuals and organizations through education, outreach, and information dissemination.

  16. Electrical transmission line diametrical retainer

    Science.gov (United States)

    Hall, David R.; Hall, Jr., H. Tracy; Pixton, David; Dahlgren, Scott; Sneddon, Cameron; Briscoe, Michael; Fox, Joe

    2004-12-14

    The invention is a mechanism for retaining an electrical transmission line. In one embodiment of the invention it is a system for retaining an electrical transmission line within down hole components. In accordance with one aspect of the invention, the system includes a plurality of downhole components, such as sections of pipe in a drill string. The system also includes a coaxial cable running between the first and second end of a drill pipe, the coaxial cable having a conductive tube and a conductive core within it. The invention allows the electrical transmission line to with stand the tension and compression of drill pipe during routine drilling cycles.

  17. Rekordhind Man Ray eest

    Index Scriptorium Estoniae

    1998-01-01

    Ameerika sürrealistliku fotograafi Man Ray 1926. a. Pariisis pildistatud foto 'Must ja valge, Pariis (positiiv ja negatiiv)', mis kujutab Ray armukese Kiki de Montparnasse'i portreed, maksis New Yorgi fotooksjonil 7, 3 miljonit Eesti krooni

  18. Chest X-Ray

    Medline Plus

    Full Text Available ... the most commonly performed x-ray exams and use a very small dose of ionizing radiation to ... to your health. While a chest x-ray use a tiny dose of ionizing radiation, the benefit ...

  19. ALICE Cosmic Ray Detector

    CERN Multimedia

    Fernandez Tellez, A; Martinez Hernandez, M; Rodriguez Cahuantzi, M

    2013-01-01

    The ALICE underground cavern provides an ideal place for the detection of high energy atmospheric muons coming from cosmic ray showers. ACORDE detects cosmic ray showers by triggering the arrival of muons to the top of the ALICE magnet.

  20. Gamma-ray bursts

    National Research Council Canada - National Science Library

    Gehrels, Neil; Mészáros, Péter

    2012-01-01

    Gamma-ray bursts (GRBs) are bright flashes of gamma rays coming from the cosmos. They occur roughly once per day, typically last for tens of seconds, and are the most luminous events in the universe...

  1. Hand x-ray

    Science.gov (United States)

    X-ray - hand ... A hand x-ray is taken in a hospital radiology department or your health care provider's office by an ... technician. You will be asked to place your hand on the x-ray table, and keep it ...

  2. X-Ray

    Science.gov (United States)

    ... show up on chest X-rays. Breast cancer. Mammography is a special type of X-ray test used to examine breast tissue. Enlarged heart. This sign of congestive heart failure shows up clearly on X-rays. Blocked blood vessels. Injecting a contrast material that contains iodine can help highlight sections ...

  3. Supernovae and cosmic rays

    CERN Document Server

    Woltjer, L

    1978-01-01

    The energetic requirements for cosmic-ray acceleration are evaluated and the abundances of various elements, electrons, and positrons, are reviewed. Various models for cosmic-ray production involving different aspects of the supernova process are evaluated. The difficulties in theories which make pulsars the main source of cosmic rays are stressed. (4 refs).

  4. Medidas morfofuncionais do coração obtidas por ressonância magnética em brasileiros

    Directory of Open Access Journals (Sweden)

    Robson Macedo

    2013-07-01

    Full Text Available FUNDAMENTO: Medidas ainda hoje utilizadas como referência na ressonância magnética cardíaca foram obtidas principalmente de estudos realizados em populações norte-americanas e europeias. OBJETIVO: Obter medidas do diâmetro diastólico, diâmetro sistólico, volume diastólico final, volume sistólico final, fração de ejeção e massa miocárdica dos ventrículos esquerdo e direito em brasileiros. MÉTODOS: Foram submetidos à ressonância magnética cardíaca, utilizando técnica de precessão livre em estado de equilíbrio, 54 homens e 53 mulheres, com idade média de 43,4 ± 13,1 anos, assintomáticos, sem cardiopatias. RESULTADOS: As médias e os desvios padrão dos parâmetros do ventrículo esquerdo foram: diâmetro diastólico = 4,8 ± 0,5 cm; diâmetro sistólico = 3,0 ± 0,6 cm; volume diastólico final = 128,4 ± 29,6 mL; volume sistólico final = 45,2 ± 16,6 mL; fração de ejeção = 65,5 ± 6,3%; massa = 95,2 ± 30,8 g. Para o ventrículo direito, foram: diâmetro diastólico = 3,9 ± 1,3 cm; diâmetro sistólico = 2,5 ± 0,5 cm; volume diastólico final = 126,5 ± 30,7 mL; volume sistólico final = 53,6 ± 18,4 mL; fração de ejeção = 58,3 ± 8,0% e massa = 26,1 ± 6,1 g. As massas e os volumes foram significativamente maiores nos homens, exceto para o volume sistólico final do ventrículo esquerdo. A fração de ejeção do ventrículo direito foi significativamente maior nas mulheres. Houve correlação significativa e inversa do volume sistólico do volume direito com o aumento da idade. CONCLUSÃO: Este estudo descreveu, pela primeira vez, medidas cardíacas obtidas pela ressonância magnética cardíaca em brasileiros assintomáticos, sem cardiopatias, mostrando diferenças de acordo com o gênero e a idade.

  5. Obtención de una medida conjunta para establecer un ranking de las universidades estatales según financiación y tasa

    Directory of Open Access Journals (Sweden)

    Alvarez Martínez Pedro

    2007-01-01

    Full Text Available Las universidades estatales pueden ser priorizadas conforme a cada uno de los indicadores “ (A trasferencias corrientes destinadas a educación superior”, “(B gasto en educación superior de cada Comunidad Autónoma por estudiante”, “(C tasas medias pagadas por cada estudiante, excluidas becas”. El presente trabajo desarrolla una metodología que nos ha permitido determinar una priorización única mediante la aplicación del modelo de Rasch. Se han categorizado los datos originales en niveles de un hipotético constructo, financiación, definido por los indicadores (A, (B y (C. El modelo de Rasch ha transformado el “raw score” (contabilizado en niveles de las universidades en “standard score”, la medida. Esta medida de la financiación definida por (A,(B y (C nos facilita un único ranking de las universidades, así como un ranking de la propensión de los indicadores.La medida obtenida nos determina la pauta común que siguen los datos analizados, denotando aquellos correspondientes a las universidades e indicadores que no siguen la pauta. Los resultados obtenidos ponen de manifiesto la eficiencia del modelo de Rasch como un instrumento de medida

  6. Medida indireta da clorofila e sua relação com o manejo da adubação nitrogenada em plantas cítricas fertirrigadas

    National Research Council Canada - National Science Library

    Souza, Thais Regina de; Salomão, Leandro Caixeta; Andrade, Thomas Fiore de; Bôas, Roberto Lyra Villas; Quaggio, José Antônio

    2011-01-01

    ... áreas de cultivo de plantas cítricas, o N-foliar vem sendo empregado como guia para recomendação de N. O objetivo deste estudo foi avaliar a sensibilidade da medida indireta da clorofila como...

  7. Fractional Transmission Line with Losses

    Science.gov (United States)

    Gómez-Aguilar, José Francisco; Dumitru, Baleanu

    2014-11-01

    In this manuscript, the fractional transmission line with losses is presented. The order of the Caputo derivative is considered as 0 Mittag-Leffler functions. The classic cases are recovered when β and γ are equal to 1.

  8. Transmission of Information: An Overview.

    Science.gov (United States)

    Thoma, George R.

    1981-01-01

    Outlines the basic principles underlying the transmission of information, including analog and digital modulation, limitations to communications, configurations of communications networks, optical fiber cables, and earth satellites. Six references are cited. (FM)

  9. Hybrid-Vehicle Transmission System

    Science.gov (United States)

    Lupo, G.; Dotti, G.

    1985-01-01

    Continuously-variable transmission system for hybrid vehicles couples internal-combustion engine and electric motor section, either individually or in parallel, to power vehicle wheels during steering and braking.

  10. Transmission line model for nanoelectronics

    Directory of Open Access Journals (Sweden)

    Nelin E. A.

    2009-08-01

    Full Text Available Analytical expressions for resonant parametres and characteristics of typical barrier nanoelectronic structures have been received on the basis of the transmission line model. Characteristics illustrating the efficiency of such approach are presented in the article.

  11. Echinococcosis : disease, detection and transmission

    NARCIS (Netherlands)

    Craig, P.S.; Rogan, M T; Campos-Ponce, M

    2003-01-01

    Echinococcosis is one of the world's most geographically widespread parasitic zoonoses, with transmission occurring in tropical, temperate and arctic biomes. Most human infections are due to Echinococcus granulosus transmitted between domestic dogs and livestock, but this cosmopolitan species also

  12. 77 FR 60689 - Transmission Planning and Cost Allocation by Transmission Owning and Operating Public Utilities

    Science.gov (United States)

    2012-10-04

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF ENERGY Federal Energy Regulatory Commission Transmission Planning and Cost Allocation by Transmission Owning and... respect to compliance obligations in Transmission Planning and Cost Allocation by Transmission Owning and...

  13. Radio and line transmission 2

    CERN Document Server

    Roddy, Dermot

    2013-01-01

    Radio and Line Transmission, Volume 2 gives a detailed treatment of the subject as well as an introduction to additional advanced subject matter. Organized into 14 chapters, this book begins by explaining the radio wave propagation, signal frequencies, and bandwidth. Subsequent chapters describe the transmission lines and cables; the aerials; tuned and coupled circuits; bipolar transistor amplifiers; field-effect transistors and circuits; thermionic valve amplifiers; LC oscillators; the diode detectors and modulators; and the superheterodyne receiver. Other chapters explore noise and interfere

  14. Free-space power transmission

    Energy Technology Data Exchange (ETDEWEB)

    1989-11-01

    NASA Lewis Research Center organized a workshop on technology availability for free-space power transmission (beam power). This document contains a collection of viewgraph presentations that describes the effort by academia, industry, and the national laboratories in the area of high-frequency, high-power technology applicable to free-space power transmission systems. The areas covered were rectenna technology, high-frequency, high-power generation (gyrotrons, solar pumped lasers, and free electron lasers), and antenna technology.

  15. Heartland Alliance for Regional Transmission

    Energy Technology Data Exchange (ETDEWEB)

    Jackson, Nancy [Climate and Energy Project, Inc., Hutchinson, KS (United States)

    2017-03-15

    The Heartland Alliance for Regional Transmission (HART) will foster a candid, productive conversation among stakeholders that identifies challenges to and benefits from a massive build out of wind generation and transmission across the Southwest Power Pool. Based on the outcomes of those deliberations, HART will develop and deliver an ambitious, coordinated, peer-to-peer outreach effort that spans the SPP to improve market acceptance for wind.

  16. Medida da área do canal vertebral lombar em diferentes faixas etárias Medida de la superficie del canal vertebral lumbar en los diferentes grupos de edad Lumbar spinal canal area in different age groups

    Directory of Open Access Journals (Sweden)

    Jair Ortiz

    2009-03-01

    Full Text Available OBJETIVO: medir as dimensões do canal vertebral lombar por meio de tomografia computadorizada, de modo a comparar os valores das diferentes faixas etárias e determinação da possível diferença entre elas. MÉTODOS: a área do canal vertebral lombar foi medida em 78 indivíduos, divididos em oito grupos etários, com dados obtidos de exames de tomografia computadorizada do abdômen. As medidas foram realizadas nos cortes axiais nas vértebras L1, L3 e L5 ao nível da região trans-pedicular. Utilizado o método estatístico de ANOVA (análise de variância com análise de diferentes "p-value" para cada grupo estudado. RESULTADOS: as medidas para L1 produziram um "p-value" de 0,586 para a faixa etária e um "p-value" de 0,003 para o sexo. Portanto, não há diferença entre as faixas etárias e há diferença entre os sexos, sendo maior no sexo masculino. Para L3, o "p-value" da faixa etária foi de 0,258 e para o sexo de 0,062; no caso de L5, o "p-value" para a faixa etária foi de 0,279 e para o sexo de 0,003. CONCLUSÃO: não foi observada diferença estatística da área do canal vertebral lombar nos níveis L1, L3 e L5 nas diferentes faixas etárias. No entanto o diâmetro no sexo masculino foi maior com diferença estatística.OBJETIVO: medir el área del canal vertebral lumbar, utilizando la tomografía computarizada, comparándolo entre los distintos grupos de edad y determinar si existen diferencias entre ellos. MÉTODOS: el área del canal vertebral lumbar se midió en 78 temas, divididos en 8 grupos, con los datos obtenidos a partir de exploraciones de tomografía computarizada del a domen. Las mediciones se hicieron en las vértebras L1, L3 y L5 en la región transpedicular. RESULTADOS: medidas para L1 producido un p-valor de 0,586 para el grupo de edad y un p-valor de 0,003 para el sexo, por tanto, no hay diferencia entre los grupos de edad y hay diferencias entre los sexos, siendo mayor en los hombres; para L3, el "pvalue" del

  17. Electrically Isolating Transmission-Line Driver

    Science.gov (United States)

    Marchman, Robert H.

    1992-01-01

    Proposed optoelectronic coupling circuit used to insert signal in transmission line and to isolate transmission line from ground of circuit in which signal originates. Made from commercially available components, reduces susceptibility to interference along transmission path.

  18. Primeiras considerações sobre medidas aerodinâmicas da consoante nasal palatal do português brasileiro

    Directory of Open Access Journals (Sweden)

    Michele Gindri Vieira

    2017-03-01

    Full Text Available Este estudo tem por objetivo investigar a consoante nasal palatal do português brasileiro (PB, focalizando a análise acústica e as medidas aerodinâmicas obtidas a partir do piezo-elétrico. Os dados aqui discutidos referem-se à produção de três falantes naturais de Florianópolis (Santa Catarina. O piezo-elétrico, equipamento que capta as vibrações do ar nas cavidades nasais, possibilita a observação das configurações das curvas de fluxo aéreo nasal (FAN. Neste artigo, inicialmente, observa-se o comportamento acústico dos dados para identificação da gradiência mostrada pela consoante nasal palatal. Os resultados, por meio de análise acústica, indicam a ocorrência de uma gradiência fônica identificada nas produções que vão da consoante nasal palatal até a vogal nasalizada. Os resultados aerodinâmicos indicam distintas configurações de curvas de FAN para essas produções. Observa-se que a nasalidade mostrou-se antecipatória, com a curva de FAN iniciando antes da consoante nasal palatal; e, ao mesmo tempo, progressiva, com expansão da curva de FAN após a consoante nasal. A antecipação da curva de FAN pode ocorrer de modo variado: (1 sincronizado com o início da vogal precedente (antecipação total ou (2 logo depois do início da vogal precedente (antecipação parcial. Pode-se dizer que as medidas aerodinâmicas, associadas à análise acústica, são importantes para a busca por maior entendimento da nasalidade no PB.

  19. Qualidade de Vida de pacientes hipertensos e comparação entre dois instrumentos de medida de QVRS

    Directory of Open Access Journals (Sweden)

    Michelle Adler Normando Carvalho

    2012-05-01

    Full Text Available FUNDAMENTO: Medir Qualidade de Vida (QV relacionada à saúde auxilia na avaliação da eficiência de um tratamento e identifica problemas de maior impacto na QV do paciente. No entanto, essas medidas são mais seguras se avaliadas por instrumentos genéricos e específicos conjuntamente, fazendo-se necessário verificar se há compatibilidade entre esses e evitar repetições e contradições entre os domínios. OBJETIVO: Descrever o perfil de qualidade de vida de pacientes hipertensos e avaliar a compatibilidade de um instrumento específico (MINICHAL e outro genérico (SF-36. MÉTODOS: Cem pacientes hipertensos adultos em tratamento ambulatorial entrevistados. A média da QVRS medida pelo MINICHAL foi de 6,64 (DP 6,04 no estado mental e média de 5,03 (DP 4,11 no estado manifestações somáticas. As médias para o instrumento SF-36 foram por ordem de classificação: limitação por aspectos físicos 47,3 (DP 42,9, vitalidade 57,4 (DP 19,7, limitação por aspectos emocionais 58 (DP 44,7, capacidade funcional 58,7 (DP 27,8, dor 60,4 (DP 26,3, estado geral de saúde 60,7 (DP 22,7, saúde mental 66,8 (DP 22,1 e aspectos sociais 78 (DP 26,1. RESULTADOS: O MINICHAL apresentou correlação significativa (p < 0,001 com o SF-36 em todos os domínios. CONCLUSÃO: O MINICHAL provou ser um instrumento útil na avaliação da QVRS em pacientes hipertensos. (Arq Bras Cardiol. 2012; [online].ahead print, PP.0-0

  20. Diferencas entre as medidas do indice-h geradas em distintas fontes bibliograficas e engenho de busca

    Directory of Open Access Journals (Sweden)

    Mauricio Lima Barreto

    2013-06-01

    Full Text Available MÉTODOS: Comparou-se a produção científica de pesquisadores brasileiros bolsistas 1-A do CNPq, das áreas da saúde coletiva, imunologia e medicina. Os índices-h de cada pesquisador foram estimados com base no Web of Science , Scopus e Google Acadêmico. Foram estimadas as medianas dos índices-h para os grupos de pesquisadores em cada área, e para comparar as diferenças foram usados, de acordo com cada fonte, o teste não paramétrico de Kruskal- Wallis e as comparações múltiplas de Behrens-Fisher. RESULTADOS: A área da imunologia apresentou mediana dos índices-h mais alta que os da Saúde Coletiva e da Medicina quando se utiliza a base Web of Science . Porém, essa diferença desapareceu quando a comparação foi feita utilizando a base Scopus ou o Google Acadêmico. CONCLUSÕES: A emergência do Google Acadêmico traz a um novo patamar as discussões sobre a medida do impacto bibliométrico das publicações cientificas. Áreas com fortes componentes profissionais, em que o conhecimento produzido é e deve ser publicado também na língua nativa, vis-a-vis sua difusão para a comunidade internacional, têm padrão de publicações e citações científicas diferente de áreas exclusivas ou predominantemente acadêmicas e mais bem captado pelo Google Acadêmico. OBJETIVO: Analisar a utilização do índice-h como medida do impacto bibliográfico da produção científica de pesquisadores brasileiros.

  1. Vulnerabilidad en Mujeres Prostituidas: Medidas de Protección Legal (Psychological Vulnerability on Prostituted Women: Legal Protection Measures

    Directory of Open Access Journals (Sweden)

    Andrea Gutiérrez García

    2015-06-01

    Full Text Available Gender-based violence has moved from being understood as a private matter to social problem. This manifestation of discrimination, inequality and power of men over women in the context of relationships is condemn in our country by the Law on Integral Protection Measures against Gender Violence 1/2004 of December 28.However, prostitution which has its foundations in the same patriarchal structure has no specific legislation that highlights this fact and condemns it. In our paper, taking as an example the Organic Law 1/2004, we developed a proposal justified on the actions that should be carried out at this respect. We mainly focus on three issues: equal education; discourage demand and protection and assistance to victims. We also bear in mind the need of social intolerance and legal condemnation in relation to the people who get benefits from the exploitation of others. La violencia de género ha pasado de ser considerada un asunto privado a entenderse como un problema social. Esta manifestación de discriminación, desigualdad y poder de los hombres sobre las mujeres en el marco de las relaciones de pareja es condenada en nuestro país por la Ley Orgánica de Medidas de Protección Integral contra la Violencia de Género 1/2004 de 28 de diciembre.Sin embargo, la prostitución, que hunde sus cimientos en la misma estructura patriarcal en la que se asienta la violencia de género, carece de una legislación específica que ponga de manifiesto esta relación y la condene. En este trabajo tomando como ejemplo la Ley Orgánica 1/2004 de medidas de protección integral contra la violencia de género, elaboramos una propuesta justificada sobre las actuaciones que deberían abordarse al hacer frente a esta problemática. Nos centramos principalmente en tres cuestiones que consideramos básicas: educación en igualdad; desincentivación de la demanda; protección y ayuda a las víctimas. Además, resulta imprescindible la construcción de entorno

  2. Regulación de las medidas tecnológicas en el derecho comparado. Especial referencia al caso de Estados Unidos, Reino Unido y Australia

    Directory of Open Access Journals (Sweden)

    Juan Sebastián Sereno Restrepo

    2009-11-01

    Full Text Available En algunas normas europeas y en precedentes judiciales estadounidenses se encuentran los primeros antecedentes de tutela jurídica a medidas tecnológicas de protección. Sin embargo, sólo a partir de 1996, con del Tratado ompi de Derecho de Autor, se encuentra una consagración expresa de las medidas tecnológicas de protección. La amplia formulación adoptada en el tratado ha sido desarrollada por las legislaciones de los países signatarios de él. En cuanto a la definición, se encuentran los siguientes elementos: producto, dispositivo, componente; aplicación de la medida sobre un bien inmaterial sujeto al régimen de copyright (derecho de autor; la especial finalidad de prevenir o inhibir la infracción al copyright o controlar el acceso; la efectividad; la aplicación de la medida por un sujeto cualificado. La legitimación para el ejercicio del derecho, las modalidades de infracción, las consecuencias civiles y penales y las eximentes de responsabilidad han sido también objeto de tratamiento normativo. Este artículo desarrolla el significado de los complejos elementos enunciados, con ayuda de la jurisprudencia y la doctrina, en tres secciones: estudio de la función práctica de las medias tecnológicas y su historia legislativa; definición de medida y condiciones para su protección; modalidades de infracción y eximentes de responsabilidad.

  3. Relação da Importância dos Recursos Estratégicos com as Medidas de Desempenho em Empresas Brasileiras

    Directory of Open Access Journals (Sweden)

    Ilse Maria Beuren

    2016-04-01

    Full Text Available O estudo objetiva verificar se as medidas de desempenho são variáveis mediadoras entre a importância dos recursos estratégicos e a avaliação de desempenho em empresas brasileiras. De modo específico o estudo busca investigar a percepção dos gestores quanto à importância atribuída às medidas de desempenho tradicionais e não tradicionais e aos recursos estratégicos de capital humano, estrutural e físico em empresas brasileiras. O estudo pauta-se na pesquisa realizada por Widener (2006 em empresas norte americanas. Assim, um levantamento foi realizado junto aos gestores das empresas listadas na BM&FBovespa nos níveis 1 e 2 de Governança Corporativa. Na análise dos dados foi aplicada estatística descritiva e análise fatorial. Os resultados mostram que os gestores atribuem importância a várias medidas de desempenho, mas a estatística descritiva evidencia que a maior importância é atribuída às medidas de retorno e financeiras tradicionais. Dentre os recursos estratégicos, o capital humano desponta como o recurso mais importante para as empresas analisadas, seguido do capital estrutural e do capital físico. A partir das relações estabelecidas na pesquisa de base e aplicadas neste estudo, conclui-se que as medidas de desempenho são variáveis mediadoras entre a importância dos recursos estratégicos e o desempenho na percepção dos gestores.

  4. Regulación de las medidas tecnológicas en el derecho comparado. Especial referencia al caso de Estados Unidos, Reino Unido y Australia

    Directory of Open Access Journals (Sweden)

    Juan Sebastián Sereno Restrepo

    2009-11-01

    Full Text Available En algunas normas europeas y en precedentes judiciales estadounidenses se encuentran los primeros antecedentes de tutela jurídica a medidas tecnológicas de protección. Sin embargo, sólo a partir de 1996, con del Tratado ompi de Derecho de Autor, se encuentra una consagración expresa de las medidas tecnológicas de protección. La amplia formulación adoptada en el tratado ha sido desarrollada por las legislaciones de los países signatarios de él. En cuanto a la definición, se encuentran los siguientes elementos: producto, dispositivo, componente; aplicación de la medida sobre un bien inmaterial sujeto al régimen de copyright (derecho de autor; la especial finalidad de prevenir o inhibir la infracción al copyright o controlar el acceso; la efectividad; la aplicación de la medida por un sujeto cualificado. La legitimación para el ejercicio del derecho, las modalidades de infracción, las consecuencias civiles y penales y las eximentes de responsabilidad han sido también objeto de tratamiento normativo. Este artículo desarrolla el significado de los complejos elementos enunciados, con ayuda de la jurisprudencia y la doctrina, en tres secciones: estudio de la función práctica de las medias tecnológicas y su historia legislativa; definición de medida y condiciones para su protección; modalidades de infracción y eximentes de responsabilidad

  5. Desarrollo de un instrumento de medida de severidad sintomática del síndrome del intestino irritable

    Directory of Open Access Journals (Sweden)

    P. FERNÁNDEZ MARÍN

    2000-01-01

    Full Text Available El Síndrome del Intestino Irritable (SII, constituye un trastorno motor del intestino que cursa preferentemente con dolor abdominal y/o alteraciones en el ritmo intestinal, sin lesiones anatómicas, ni causas metabólicas o infecciosas que la justifiquen. Su incidencia entre la población general es alta y su tratamiento difícil y costoso. Desde la Psicología de la Salud se pretende un abordaje integral del síndrome con vocación interdisciplinar, donde interactúen profesionales médicos y psicólogos, y se reclama una aproximación conductual con base en el análisis funcional como medio para realizar una correcta evaluación, para lo cual los autores han diseñado un cuestionario específico de medida de severidad sintomática del SII, validado con población española.

  6. Uma medida de apego: versão brasileira da Experiences in Close Relationship Scale - Reduzida (ECR-R-Brasil

    Directory of Open Access Journals (Sweden)

    Jean Carlos Natividade

    2015-12-01

    Full Text Available Resumo: Os objetivos desta pesquisa foram adaptar e buscar evidências de validade para a população brasileira da versão reduzida da Experience in Close Relationship. Após procedimentos de tradução dos 12 itens, o instrumento foi respondido por 4.879 adultos de todas as regiões do país, 66% mulheres. Análises fatoriais exploratórias e confirmatórias evidenciaram a adequação da estrutura de dois fatores, em consonância com o estudo original. Os índices de consistência interna dos fatores "ansiedade" e "evitação" mostraram-se satisfatórios. Encontraram-se resultados de diferenças sexuais e correlações com tempo de relacionamento e níveis de sociossexualidade de acordo com as hipóteses teóricas e muito semelhantes aos encontrados para a versão brasileira da medida estendida. Ainda, a escala foi capaz de diferenciar participantes que estavam em relacionamento compromissado daqueles em relacionamento sem compromisso. Considera-se que as evidências de validade e fidedignidade encontradas para a ECR-R-Brasil mostraram-se satisfatórias.

  7. Asertividad: Diferencias de sexo en estudiantes universitarios chilenos medidas a través del Inventario de Gambrill y Richey

    Directory of Open Access Journals (Sweden)

    Jorge Maluenda Albornoz

    2017-01-01

    Full Text Available La presente investigación explora diferencias de sexo en asertividad medidas a través del Inventario de Asertividad de Gambrill y Richey variable considerada signiicativa para la formación transversal de profesionales. El objetivo es identiicar diferencias de sexo en relación a asertividad en un grupo de estudiantes universitarios chilenos. Se realiza un muestreo por conveniencia, y a partir de ello, un estudio descriptivo de corte transversal. El análisis estadístico se desarrolla a partir de la prueba t de Student y U de Mann y Whitney. El análisis por dimensión muestra diferencias de sexo en tres dimensiones para la escala Grado de Incomodidad: “Manifestar Oposición”, “Rechazar Solicitudes” e “Involucrarse en Situaciones Agradables” (p<0.005 . Por su parte, la escala Probabilidad de Respuesta ofrece diferencias de sexo signiicativas para cuatro dimensiones: “Manifestar Oposición”, “Exponerse a Situaciones Desconocidas” y “Manejar Situa- ciones Incómodas” (p<0.005, con puntajes mayores para las mujeres exceptuando en “Asumir Limitaciones Personales” donde hombres obtienen mayor puntaje. Se concluyen diferencias de sexo signiicativas en relación a asertividad para este grupo de estudiantes donde el rol de género ofrece una explicación para dichas diferencias.

  8. Relaciones genéticas en localidades de Salta, Argentina: ¿qué reflejan las medidas de distancia?

    Directory of Open Access Journals (Sweden)

    Albeza, María V.

    2010-01-01

    Full Text Available A partir de datos de once STRs autosómicos se calcularon diferentes coeficientes de distancia genética en cinco poblaciones de la provincia de Salta y se elaboraron los dendrogramas correspondientes. Cuando se incorporaron datos de la bibliografía, se amplió el análisis a 16 poblaciones (siete de la provincia y nueve de diferentes regiones del país, reduciéndose a 9 el número de loci comunes utilizados en la estimación de las diferentes medidas de distancia. Las representaciones gráficas no reflejaron las vinculaciones esperadas en función de sus proximidades geográficas, pues hubo una amplia gama de asociaciones, reflejando inconsistencias mutuas. De acuerdo al test de Mantel, no existe correlación con la matriz de distancia geográfica en cada caso (0,23 < r < 0,40 con niveles de significación que variaron entre 0,22 y 0,98, por lo que las distancias genéticas no tuvieron relación con la proximidad geográfica entre poblaciones. Tampoco existió correlación entre STRs y otros marcadores genéticos para localidades de la provincia (r = 0,10163; t = 2,3918, p = 0,9916

  9. O uso de medidas intelectuais na análise do monitoramento metacognitivo de crianças

    Directory of Open Access Journals (Sweden)

    Marília Zampieri

    Full Text Available O monitoramento metacognitivo é uma das habilidades compreendidas pela metacognição. É avaliado utilizando-se instrumentos de autorrelato ou pela formulação de julgamentos. O objetivo do presente estudo foi investigar o monitoramento metacognitivo de crianças durante a realização de três subtestes de uma bateria de inteligência, cujo referencial é o Modelo Cattell-Horn-Carroll. Os participantes responderam aos subtestes e foram solicitados a emitir estimativas sobre seu desempenho. Os resultados indicaram que a amostra já apresentava habilidades de monitoramento cognitivo e algumas medidas de monitoramento mostraram-se significativamente melhores para o subteste Desempenho em Matemática. Os dados são relevantes para confirmar, na população nacional, as informações da literatura internacional, e também para discutir a importância do incentivo e estímulo ao treinamento das habilidades metacognitivas.

  10. Desenvolvimento de uma medida de controle primário e secundário para idosos

    Directory of Open Access Journals (Sweden)

    Hilma Tereza Tôrres Khoury

    Full Text Available Apresenta-se neste artigo um instrumento desenvolvido para avaliar os processos adaptativos de controle primário e controle secundário em idosos. Controle primário é definido como uma estratégia utilizada para modificar o ambiente, visando adequá-lo às próprias necessidades. Controle secundário refere-se a esforços para adaptar-se ao ambiente. Participaram 315 idosos, entre 60 e 92 anos, sendo 33,3% homens e 66,7% mulheres. As entrevistas foram realizadas em seus domicílios. A análise fatorial identificou três fatores independentes: Esforço de Realização com Recursos Próprios (Controle Primário, Esforço de Adaptação (Controle Secundário e Esforço de Realização com Ajuda (Controle Primário. Considerando a escassez de instrumentos disponíveis para avaliar esses construtos, espera-se que essa medida contribua para o avanço de pesquisas e serviços destinados aos idosos.

  11. Análise de fatores do instrumento de medida do impacto da doença no cotidiano

    Directory of Open Access Journals (Sweden)

    Rafaela Batista dos Santos Pedrosa

    2016-08-01

    Full Text Available RESUMO Objetivo: verificar a estrutura de fatores do Instrumento para Mensuração do Impacto da Doença no Cotidiano do Valvopata (IDCV quando aplicado em coronariopatas. Método: fizeram parte deste estudo 153 coronariopatas em seguimento ambulatorial. A estrutura de fatores do IDCV foi inicialmente avaliada por meio da análise confirmatória de fatores e, subsequentemente, por meio da análise exploratória de fatores. Utilizou-se o método de estimação dos componentes principais de análise com rotação Varimax e eigenvalues acima de um para extração de fatores e carga fatorial superior a 0,40 para seleção dos itens. A consistência interna foi estimada por meio do coeficiente alfa de Cronbach. Resultados: a análise confirmatória não confirmou a estrutura original de fatores do IDCV. A análise exploratória de fatores evidenciou três dimensões que, em conjunto, explicaram 78% da variância da medida. Conclusão: estudos futuros com ampliação da casuística são necessários para confirmação da nova estrutura de fatores do IDCV.

  12. Distribucion hiperbolica generalizada: una aplicacion en la seleccion de portafolios y en cuantificacion de medidas de riesgo de mercado

    Directory of Open Access Journals (Sweden)

    Jose Luis Alayon

    2015-12-01

    Full Text Available La distribución Hiperbólica Generalizada ha sido usada por académicos y profesionales para eliminar los problemas de colas de distribución delgadas en finanzas, y por su utilidad en la modelación de los retornos de los activos y de las medidas de riesgo de mercado. En este trabajo, la distribución hiperbólica generalizada es usada para encontrar el portafolio óptimo y su riesgo de mercado. Igualmente, se desarrolla un método para la Selección de Portafolio Robusto la cual reduce la sensibilidad del portafolio ante variaciones de los parámetros de la distribución. Luego de esto, se muestra un esquema comparativo para determinar cómo la inclusión del nuevo método representa un avance respecto a la teoría de selección de portafolios de Markowitz. Por último, en algunos gráficos se muestra el efecto de los parámetros sobre la forma de la distribución, lo que se usa para generar escenarios de estrés y portafolios óptimos.

  13. Bone X-Ray (Radiography)

    Medline Plus

    Full Text Available ... ray examination. X-rays usually have no side effects in the typical diagnostic range for this exam. ... x-rays. A Word About Minimizing Radiation Exposure Special care is taken during x-ray examinations to ...

  14. Bone X-Ray (Radiography)

    Medline Plus

    Full Text Available ... ray examination. X-rays usually have no side effects in the typical diagnostic range for this exam. ... Media Arthritis X-ray, Interventional Radiology and Nuclear Medicine Radiation Safety Images related to X-ray (Radiography) - ...

  15. Single atom identification by energy dispersive x-ray spectroscopy

    Energy Technology Data Exchange (ETDEWEB)

    Lovejoy, T. C.; Dellby, N.; Krivanek, O. L. [Nion, 1102 8th St., Kirkland, Washington 98033 (United States); Ramasse, Q. M. [SuperSTEM Laboratory, STFC Daresbury, Keckwick Lane, Daresbury WA4 4AD (United Kingdom); Falke, M.; Kaeppel, A.; Terborg, R. [Bruker Nano GmbH, Schwarzschildstr. 12, 12489 Berlin (Germany); Zan, R. [School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)

    2012-04-09

    Using aberration-corrected scanning transmission electron microscope and energy dispersive x-ray spectroscopy, single, isolated impurity atoms of silicon and platinum in monolayer and multilayer graphene are identified. Simultaneously acquired electron energy loss spectra confirm the elemental identification. Contamination difficulties are overcome by employing near-UHV sample conditions. Signal intensities agree within a factor of two with standardless estimates.

  16. Sexual transmission of HIV-1.

    Science.gov (United States)

    Fox, Julie; Fidler, Sarah

    2010-01-01

    HIV-1 transmission occurs in a limited number of ways all of which are preventable. Overall, the risk of HIV-1 transmission following a single sexual exposure is low especially in comparison with other sexually transmitted infections (STIs); with estimates of the average probability of male to female HIV-1 transmission only 0.0005-0.0026 per coital act. The risk of acquiring HIV-1 from a single contact varies enormously and is dependant upon the infectiousness of the HIV-1 positive individual and the susceptibility to HIV-1 of their sexual partner. An understanding of the determinants of HIV-1 transmission is important not only to assess the infection risk to an individual when exposed to the virus (e.g. to determine the provision of post exposure prophylaxis), but also to make accurate predictions on the potential spread of HIV-1 infection in a population and to direct appropriate targeted prevention strategies. In this review article we summarise the current literature on the major worldwide source of HIV-1 acquisition, sexual transmission. This article forms part of a special issue of Antiviral Research marking the 25th anniversary of antiretroviral drug discovery and development, Vol 85, issue 1, 2010. Copyright 2009 Elsevier B.V. All rights reserved.

  17. Atlas transmission line breakdown analysis

    CERN Document Server

    Nielsen, K E; Ballard, E O; Elizondo, J M; Gribble, R F; McCuistian, B T; Parsons, W M

    1999-01-01

    The Atlas facility will use 24 radially converging, vertically oriented and tapered, oil insulated, triplate transmission lines between the Marx generators and the central load region. Among the requirements of the transmission lines are low inductance and high reliability. The inter-conductor gap is nominally 2 cm and the lines taper from a height of 1.75 m at the Marx end to 0.32 m at the output end. The aluminum conductors, held together by 20 insulating spacers, are assembled and inserted as a unit into radial oil-filled steel tanks. The negative, high-voltage, center conductor is 2.54-cm thick and the outer ground conductors are 1.59-cm thick. All 24 triplate transmission lines connect to a transition section at near 1 m radius that couples the transmission lines to a disk/conical solid- dielectric-insulated power flow channel transmission line terminating at the load. Peak operating voltage on the lines can be as high as 240 kV with an effective stress time of 0.8 mu s. Testing of small sections of the ...

  18. Abdominal fat indicators: anthropometry vs dual energy x-ray absortometry

    Directory of Open Access Journals (Sweden)

    Maria Fátima Glaner

    2008-06-01

    Full Text Available Excessive abdominal fat contributes to the development of chronic nontransmissible diseases. Dual emission X Ray absorptiometry (DXA is a simple to administer technique that allows abdominal fat percentage (%abdominalFDXA to be determined. Anthropometric measurements, which have been validated and are of low cost, such as the abdominal circumferences 2.5cm above the umbilical scar (ABC2,5 and level with the umbilical scar (ABCum, are used as indicators of abdominal fat. Skin folds (SF are little used for this purpose. The objective of this study was to verify which of these anthropometric indicators best correlates with and best explains abdominalFDXA. The sample was made up of 22 women (43.9±11.6 years; 34.7±8.3 %G totalDXA and 18 men (31.9±11.6 years; 19.0±8.0 %G totalDXA who were measured for ABC2.5, ABCum, suprailiac SF (SI, midaxillary SF (AM and abdominal SF (AB, while abdominalF (L1-L4 was measured by DXA. Pearson’s correlation and multivariate linear regression (“enter” method were employed to verify the anthropometric measurements’ correlations and percentage of explanation with relation to abdominalFDXA. Strong correlations and significant levels of explanation (pResumoO excesso de gordura abdominal contribui no desenvolvimento de doenças crônicas não-transmissíveis. A absortometria de raio-X de dupla energia (AXDE é uma técnica de simples aplicação, que permite a mensuração do percentual de gordura abdominal (%G abdominalAXDE. As medidas antropométricas, validadas e de baixo custo, como os perímetros abdominal 2,5cm acima da cicatriz umbilical (PAB2,5 e ao nível da cicatriz umbilical (PABum, são empregadas como indicadores de gordura abdominal. As dobras cutâneas (DC são pouco estudadas nesse sentido. Assim, o objetivo desse estudo foi verificar quais destes indicadores antropométricos mais se correlacionam e explicam o %G abdominalAXDE. A amostra foi composta por 22 mulheres (43,9±11,6 anos; 34,7±8,3 %G

  19. Mapping metals incorporation of a whole single catalyst particle using element specific X-ray nanotomography

    NARCIS (Netherlands)

    Meirer, Florian; Morris, Darius T; Kalirai, Samanbir; Liu, Yijin; Andrews, Joy C; Weckhuysen, Bert M

    2015-01-01

    Full-field transmission X-ray microscopy has been used to determine the 3D structure of a whole individual fluid catalytic cracking (FCC) particle at high spatial resolution and in a fast, noninvasive manner, maintaining the full integrity of the particle. Using X-ray absorption mosaic imaging to

  20. Optical and X-ray photoelectron spectroscopy of PbGeO 3 and Pb 5 ...

    Indian Academy of Sciences (India)

    Optical and X-ray photoelectron spectroscopy of PbGeO3 and Pb5Ge3O11 single crystals ... Optical Properties Volume 33 Issue 4 August 2010 pp 395-400 ... On gamma ray irradiation, the transmission of both the crystals is observed to deteriorate uniformly over the entire wavelength range, which has been attributed to the ...