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Sample records for aire puesta al

  1. Seminoma: puesta al día Seminoma: an update

    Directory of Open Access Journals (Sweden)

    B. Álvarez Moratinos

    2013-03-01

    Full Text Available Objetivos: Revisar y actualizar los aspectos epidemiológicos, factores de riesgo (con especial atención a los aspectos genéticos e inmunohistoquímicos, diagnósticos y terapéuticos del seminoma. Material y Métodos: Se ha realizado una revisión de la literatura en la base de datos PUBMED, utilizando la palabra clave principal »seminoma», y los subtítulos (subheadings «diagnóstico», «epidemiologia», «etiología», «genética, «mortalidad» y «tratamiento», sin restricciones en cuanto al tipo de estudio, seleccionando aquellos artículos considerados de interés para una revisión. La información se ha completado con otras fuentes bibliográficas como guías clínicas de referencia, registros de cáncer y tratados de Oncología y Urología. Se ha restringido la búsqueda a artículos en inglés o castellano. Así mismo se ha utilizado el Programa de Vigilancia, Epidemiología y Resultados Finales del Instituto Nacional del Cáncer (SEER para obtener datos de incidencia y mortalidad de cáncer en los Estados Unidos, y de GLOBOCAN para los datos referentes a otros 184 países del mundo. Resultados: Se han revisado un total de 3.131 artículos, con un periodo de búsqueda objeto de la revisión comprendido entre el 1 de enero de 1990 y el 31 de marzo del 2012, incluyendo un total de 51 revisiones sobre la epidemiología del tumor, 23 sobre los factores de riesgo genético, 66 revisiones sobre los distintos aspectos del diagnóstico y tratamiento, un estudio prospectivo y tres estudios randomizados, incluyéndose así mismo las directrices de 3 Guías Clínicas. Conclusiones: El tumor de células germinativas del testículo (TCGT supone el tumor sólido más frecuente en los varones entre los 20 y 34 años, representando, el seminoma, entre el 40 y el 50% de todos ellos. Los factores de riesgo son múltiples, congénitos y adquiridos, destacándose entre ellos la predisposición familiar y bilateralidad, la criptorquidia y la acci

  2. Medición de cortisol y sus fracciones: Una puesta al día

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    Patricia Maidana

    2013-12-01

    Full Text Available La determinación del cortisol sérico total forma parte fundamental de la exploración bioquímica de la función adrenocortical. Dado que esta hormona circula en plasma, en parte unida a proteínas de transporte y en parte en estado libre, existe la posibilidad de realizar la determinación de sus diferentes fracciones no solo en sangre sino también en orina, saliva y otros fluidos biológicos. Es posible realizar tanto determinaciones basales como pruebas funcionales y de esta manera evaluar la secreción de cortisol en un momento dado del día, estudiar su variación circadiana y analizar su relación con el resto de los componentes del eje hipotálamo-hipófiso-adrenal. Las mediciones habituales de cortisol en sangre, saliva y orina reflejan los niveles de esta hormona en el momento de la recolección o durante un período de 24 horas. Recientemente han aparecido trabajos en los cuales se propone la determinación de cortisol en cabello y uñas como potenciales marcadores del estatus hormonal en períodos más prolongados. El objetivo de esta revisión es realizar una puesta al día acerca de la metodología disponible actualmente en nuestro medio para la evaluación del eje adrenal, haciendo hincapié en su aplicación para el diagnóstico clínico.

  3. LA PUESTA AL DÍA DE UNA ESCUELA DE ARQUITECTURA

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    Vicente Manuel Vidal Vidal, Ciro Manuel Vidal Climent

    2010-05-01

    Full Text Available RESUMEN El edificio de la Escuela Técnica Superior de Arquitectura de Valencia pertenece al proyecto unitario de las cuatro escuelas que en el año 1970 fue ganado por el equipo L35. El realismo económico y técnico, así como la adopción de los postulados de la carta de Atenas, sintetizados para la ciudad funcional, tienen como resultado la separación de la ciudad en cuatro áreas funcionales: trabajo, residencia, esparcimiento y circulación. Dentro de esta disposición, se asigna a la universidad la zona destinada al trabajo, que se concreta en la docencia y la investigación.Las técnicas de construcción no han cambiado sustancialmente desde el proyecto inicial, pero tras 40 años ya se han podido experimentar y valorar los resultados de la prefabricación. El deterioro debido a las inclemencias del tiempo apoya la elección de una técnica más afín con los resultados de una mayor durabilidad, llevando la cantería a un grado de fabricación que dentro del procedimiento manufacturero es tan actual como adaptable. Las técnicas actuales posibilitan la traducción de los fabricados industrializados a un código arquitectónico donde encuentran su lógica expresiva. Se interpreta el fabricado de la piedra de la piedra actualizando su código constructivo para obtener una expresividad manual y visual que los prefabricados no pueden ofrecer.SUMMARY The building of the Higher Technical School of Architecture of Valencia pertains to the joint project of the four schools, which was won by the L35 team in 1970. Economic and technical realism, as well as the adoption of the postulates of the Athens Charter, synthesized for the functional city, had the result of separating the city into four functional areas: living, working, recreation and circulation. Within this arrangement, the university is assigned to the area destined for teaching and research, the urban space destined for working.The construction techniques had not changed substantially

  4. Un caso de puesta comunal en Kentropyx lagartija (Squamata: Teiidae

    Directory of Open Access Journals (Sweden)

    Tulli, María José

    2005-06-01

    Full Text Available Los casos de puestas comunales y de puestas coloniales han sido mencionados para varios grupos de Squamata (Graves y Duvall, 1995. Se define como puesta comunal a la deposición no incidental de huevos de dos o más hembras de una especie que utilizan una única cavidad (Espinoza y Lobo, 1996. En una puesta colonial, en cambio, los nidos son construidos de manera adyacente y los huevos generalmente no son depositados en la misma cavidad. Esta última estrategia de oviposición es más frecuente en aves que en lagartijas (Rand, 1967; Wiewandt, 1982; Mora, 1989; Burger, 1993; Espinoza y Lobo, 1996; Krysko et al., 2003. Entre los Teiidae sólo se conoce el caso de puesta comunal de Kentropyx calcarata (Magnusson y Lima, 1984.

  5. La gestión del cambio: factores humanos en la puesta en marcha de un sistema de información en Air Liquide

    OpenAIRE

    Decultot, Jean-Baptiste

    2006-01-01

    El factor humano descuida a menudo la puesta en marcha de una nueva organización en empresa. Se trata pues de poner en evidencia la importancia del factor humano en el éxito de todo proyecto de empresa como por ejemplo en la implantación de un nuevo sistema de información. Se trata ante todo hacer entusiasta, movilizar y hacer adherirse a los empleados a la ambición y a las orientaciones comunes de la empresa. En efecto, una orientación y una elección de organización son válidas sólo si el...

  6. Puesta a punto de un sistema de medida de radón en agua aplicado al estudio de acuíferos

    OpenAIRE

    Fuente Lastra, Marta

    2015-01-01

    RESUMEN: La medida en continuo de la concentración de radón en agua es muy útil para conocer el origen y principales características del acuífero o manantial en el que se encuentra. Así, por ejemplo, a partir de una concentración `base' de radón en el agua, un incremento de la misma estaría relacionado con un aporte al acuífero de agua subterránea con alta concentración de radón, mientras que una disminución sería debida a aguas superficiales y/o de lluvia que presentan concentraciones de ...

  7. Puesta al día: estadificación del carcinoma de células renales Update on staging of renal cell carcinoma.

    Directory of Open Access Journals (Sweden)

    Lisandro Paganini

    2012-09-01

    Full Text Available El cáncer de células renales o adenocarcinoma renal es el tumor renal maligno más frecuente en adultos, con una incidencia mayor entre la cuarta y sexta décadas de la vida. Los hombres se afectan el doble que las mujeres. En Argentina, por año se calcula una incidencia de 6,1 casos por 100.000 habitantes, con una mortalidad anual de 3,4 casos por 100.000 habitantes. Para la estadificación se utiliza el sistema TNM de la American Joint Committee on Cancer (AJCC, actualizado en su séptima edición (2010. Allí se reflejan algunos cambios en el T, con subdivisión de la categoría T2 (T2a > 7 cm y 10 cm. Asimismo, se considera T4 a la invasión por contigüidad de la glándula suprarrenal homolateral y T3a al compromiso de la vena renal. También se simplificó el N en N0 y N1.Renal cell cancer or renal adenocarcinoma is the most common malignant renal tumor in adults, with a higher incidence between the fourth and sixth decades of life. It is twice more frequent in men than in women. In Argentina, the estimated incidence is 6.1 cases per 100000 inhabitants per year with a mortality rate of 3.4 cases per 100000 inhabitants per year. Staging is performed using the TNM system of the American Joint Committee on Cancer (AJCC, which has been updated in its seventh edition, (2010 reflecting changes in T, with T2 subdivision (T2a > 7 cm and 10 cm, reclassification of ipsilateral adrenal involvement as T4 if there is contiguous invasion and reclassification of renal vein involvement as T3a. Nodal involvement was simplified to N0 and N1.

  8. El yacimiento chatelperroniense al aire libre de Aranbaltza (Barrika, Euskadi

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    Líbano Silvente, I.

    2012-01-01

    Full Text Available Se presentan los materiales procedentes de un nuevo yacimiento al aire libre localizado en la costa de Bizkaia. Éste fue localizado como resultado de unas obras de saneamiento por lo que los materiales recuperados están desprovistos de un contexto arqueológico preciso. Aun así un análisis tecnológico y tipológico ha permitido valorar la unidad del conjunto proponiendo la adscripción del grueso del material al Chatelperroniense. Este hallazgo abre nuevas posibilidades para el conocimiento sobre este periodo en la región Cantábrica ya que supondría la primera evidencia de un hábitat al aire libre semejante a los excavados en torno a Bayona.

  9. La "Puesta en Valor”: gubernamentalidad neoliberal macrista y patrimonio histórico y cultural

    Directory of Open Access Journals (Sweden)

    Luis María Blasco

    2015-06-01

    Full Text Available El patrimonio histórico y cultural son huellas, invenciones, ese efecto descontextualizador y recontextualizador de elementos extraídos de la realidad. Son artificios exclusivos del gobierno de la memoria. En la ciudad, por ejemplo, la representación ofrece una cadena socialmente reconocida: plaza, monumento, escultura, avenida, etcétera. El patrimonio histórico y cultural es, por ende, una de las formas de transmisión de sentidos sobre el pasado, y no solo como una herramienta de Estado, sino como una tecnología que permite la construcción de “contramemorias” (Williams, 1997 en tanto pueda recuperar aquello descartado por la tradición selectiva hegemónica. Este trabajo indaga en los procedimientos que pone en juego la gestión macrista para gobernar el patrimonio histórico y cultural; bajo la sospecha de que nos encontramos ante un tipo de gubernamentalidad que interpreta al Estado como una máquina que pretende profundizar la retirada de lo público a favor de lo privado como matriz ideológica, con la consecuencia de un tipo de ciudadano que encaja para los engranajes de este modelo: un consumidor, desmemoriado, dócil y compulsivo. Para el análisis de las técnicas y métodos que se ponen en juego en esta gubernamentalidad neoliberal macrista se retoman algunos de los procedimientos contemplados en el plan de “Puesta en Valor” para parques y plazas públicas que conforman el patrimonio histórico y cultural de la Ciudad de Buenos Aires.

  10. A lithium air battery with a lithiated Al-carbon anode.

    Science.gov (United States)

    Guo, Ziyang; Dong, XiaoLi; Wang, Yonggang; Xia, Yongyao

    2015-01-14

    A lithiated Al-carbon composite electrode with a uniform SEI film was prepared by an electrochemical method, and was then coupled with an O2 catalytic electrode to form a rechargeable Li-O2 (or air) battery with a LixAl-C anode. PMID:25415761

  11. Dry sliding wear of Ti-6Al-4V alloy in air and vacuum

    Institute of Scientific and Technical Information of China (English)

    刘勇; 杨德庄; 何世禹; 武万良

    2003-01-01

    Differences in wear rate, morphology of the worn surface and debris, and the microstructure in subsurface of the Ti-6Al-4V alloy after wear in air and vacuum were compared. The wear rate of Ti-6Al-4V alloy in air is higher than that in vacuum in all the ranges of sliding velocities and applied loads. The wear of Ti-6Al-4V alloy in air is controlled by a combination of abrasion, oxidation and delamination with micro-cracks remaining in subsurface. Under the vacuum condition, the surface layer of Ti-6Al-4V alloy experiences a severe plastic deformation on a great scale, which results in an ultra-fine microstructure.

  12. Oxidation behavior of in-situ Al2O3/TiAl composites at 900℃ in static air

    Institute of Scientific and Technical Information of China (English)

    Tao-tao Ai; Fen Wang; Xiao-ming Feng

    2009-01-01

    In-situ Al2O3/TiAl composites were successfully synthesized from the starting powders of Ti, Al, TiO2 and Nb2O5. The oxidation behavior of the composites at 900℃ in static air was investigated. The results indicate that the composite samples present a much lower oxidation mass gain. Under long-time intensive oxidation exposure, the formed oxide scale is multi-layer. The formation of the outer TiO2 layer is fine and dense, the internal Al2O3 scale has good adhesiveness with the outer TiO2 scale, and the TiO2+Al2O3 mixed layer forming the protective oxide scale is favorable for the improvement of oxidation resistance. It is believed that the incorporation of Al2O3 particulates into the metal matrix decreases the coefficient of thermal expansion of the substrate, and forms a local three-dimensional network structure that can hold the oxide scale. The formation of the oxide scale with fmer particle size, stronger adherence, less micro-defects and slower growth rate can contribute to the improvement of oxidation resistance. Nb element plays an important role in reducing the internal oxidation action of the materials, restraining the growth of TiO2 crystals andpromoting thc stable formation of the Al 2O3-riched layer,which is benfeicial to improve the oxidation properties.

  13. High-temperature oxidation behavior of Al2O3/TiAl matrix composite in air

    Institute of Scientific and Technical Information of China (English)

    AI TaoTao; WANG Fen; FENG XiaoMing

    2009-01-01

    The oxidation behavior of Al2O3/TiAl in situ composites fabricated by hot-pressing technology was in-vestigated at 900℃ in static air. The results indicate that the mass gains of the composites samples decrease gradually with increasing Nb2O5 content and the inert Al2O3 dispersoids effectively increase the oxidation resistance of the composites. The higher the Al2O3 dispersoids content, the more pro-nounced the effect. The primary oxidation precesses obey approximately the linear laws, and the cyclic oxidation precesses follow the parabolic laws. The oxidized sample containing Ti2AIN and TiAI phases in the scales exhibits excellent oxidation resistance. The oxide scale formed after exposure at 900℃ for 120 h is multiple-layered, consisting mainly of an outer TiC2 layer, an intermediate Al2O3 layer, and an inner TiO2+Al2O3 mixed layer. From the outer layer to the inner layer, TiO2+Al2O3 mixed layer presents the transit of AI-rich oxide to Ti-rich oxide mixed layer. Near the substrate, cross-section micrograph shows a relatively loose layer, and micro- and macro-pores remain on this layer, which is a transition layer and transferres from Al2O3+TiO2 scale to substrate. The thickness of oxide layer is about 20 μm. It is also found that continuous protective alumina scales can not be observed on the surface of oxida-tion scales. Ti ions diffuse outwardly to form the outer TiC2 layer, while oxygen ions transport inwardly to form the inner TiO2+Al2O3 mixed layer. Under long-time intensive oxidation exposure, the internal Al2O3 scale has s good adhesiveness with the outer TiO2 scale. No obvious spallation of the oxide scales occurs. The increased oxidation resistance by the presence of in situ Al2O3 particulates is at-tributed to the enhanced alumina-forming tendency and thin and dense scale formation. Al2O3 particu-lates enhance the potential barrier of Ti ions from M/MO interface to O/MO interface, thereby the TiO2growth rate decreases, which is also beneficial to

  14. Códigos QR: Museografía Nómade para la puesta en valor del patrimonio cultural

    Directory of Open Access Journals (Sweden)

    Lilian Meneses Plaza

    2014-07-01

    Full Text Available En la última década el sector cultural se ha apropiado de los avances científicos y las nuevas tecnologías para crear imágenes, sonidos, objetos y experiencias comunicacionales digitales que hacen más atractivo el patrimonio, mejorando la oferta de los museos y sitios patrimoniales desde el punto de vista turístico, cultural y educativo. Entre los medios que podemos mencionar destacan los museos virtuales, salas de exhibición 3D, audio-guías, códigos QR y aplicaciones para teléfonos móviles, entre otros, lo que deriva en una oferta novedosa y eficiente para la puesta en valor del patrimonio cultural. En el artículo se propone una metodología orientativa basada en la Interpretación del Patrimonio y la Museografía Nómada, para desarrollar una herramienta de gestión patrimonial apoyada en el uso de códigos QR. En esta propuesta se utilizó como referente la Ciudad de Valparaíso - Sitio Patrimonio de la Humanidad- dado que posee aptitudes de museo al aire libre, alta demanda por el turismo cultural y, además, constituye un lugar emblemático para la gestión patrimonial chilena en espacios urbanos habitados. Abstract From last decade that the cultural sector has taken the scientific advances and the new technologies to create images, sounds, objects and digital communication experiences that make the heritage more attractive, improving the museums and patrimonial sites offer to the tourism, the culture and education. Some the supports that we can mention are the virtual museums, 3D rooms, sonorous guide, QR codes and app for mobiles, etc.,presenting a new and efficient offer for putting in value the cultural heritage. In this article I propose a methodology guide based on the Heritage Interpretation and the Nomad Museography, to develop a heritage management tool about QR codes. In this methodology I use Valparaíso as example -World Heritage Site- because possesses aptitudes of outdoors museum, a high cultural tourism demand

  15. Air Plasma-Sprayed Y2O3 Coatings for Al2O3/Al2O3 Ceramic Matrix Composites

    OpenAIRE

    Mechnich, Peter; Braue, Wolfgang

    2013-01-01

    Al2O3/Al2O3 ceramic matrix composites (CMC) are candidate materials for hot-gas leading components of gas turbines. Since Al2O3/Al2O3 CMC are prone to hot-corrosion in combustion environments, the development of environmental barrier coatings (EBC) is mandatory. Owing to its favorable chemical stability and thermal properties, Y2O3 is considered a candidate EBC material for Al2O3/Al2O3 CMC. Up to one mm thick Y2O3 coatings were deposited by means of air plasma spraying (APS) on Al2O3/Al2O3 CM...

  16. High-temperature oxidation behavior of Al2O3/TiAl matrix composite in air

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    The oxidation behavior of Al2O3/TiAl in situ composites fabricated by hot-pressing technology was in-vestigated at 900℃ in static air.The results indicate that the mass gains of the composites samples decrease gradually with increasing Nb2O5 content and the inert Al2O3 dispersoids effectively increase the oxidation resistance of the composites.The higher the Al2O3 dispersoids content,the more pro-nounced the effect.The primary oxidation precesses obey approximately the linear laws,and the cyclic oxidation precesses follow the parabolic laws.The oxidized sample containing Ti2AlN and TiAl phases in the scales exhibits excellent oxidation resistance.The oxide scale formed after exposure at 900 ℃ for 120 h is multiple-layered,consisting mainly of an outer TiO2 layer,an intermediate Al2O3 layer,and an inner TiO2+Al2O3 mixed layer.From the outer layer to the inner layer,TiO2+Al2O3 mixed layer presents the transit of Al-rich oxide to Ti-rich oxide mixed layer.Near the substrate,cross-section micrograph shows a relatively loose layer,and micro-and macro-pores remain on this layer,which is a transition layer and transferres from Al2O3+TiO2 scale to substrate.The thickness of oxide layer is about 20 μm.It is also found that continuous protective alumina scales can not be observed on the surface of oxida-tion scales.Ti ions diffuse outwardly to form the outer TiO2 layer,while oxygen ions transport inwardly to form the inner TiO2+Al2O3 mixed layer.Under long-time intensive oxidation exposure,the internal Al2O3 scale has a good adhesiveness with the outer TiO2 scale.No obvious spallation of the oxide scales occurs.The increased oxidation resistance by the presence of in situ Al2O3 particulates is at-tributed to the enhanced alumina-forming tendency and thin and dense scale formation.Al2O3 particu-lates enhance the potential barrier of Ti ions from M/MO interface to O/MO interface,thereby the TiO2 growth rate decreases,which is also beneficial to improve the oxidation

  17. Dry sliding wear behavior of Ti-6Al-4V alloy in air

    Institute of Scientific and Technical Information of China (English)

    刘勇; 杨德庄; 武万良; 杨士勤

    2002-01-01

    The dry sliding wear properties of Ti-6Al-4V alloy sliding against GCr15 steel under different velocities(between 0.2 and 1.2 m/s)and applied loads(from 30 to 90 N)were tested using a pin-on-disk tester in air. The wear occurred on both surfaces of the tested couplings. The wear rate of the Ti-6Al-4V alloy ranged from 23.0 to 123.8 mg/km. The wear of Ti-6Al-4V samples was in severe wear. The wear rate of Ti-6Al-4V samples increased with the increasing of load and shows a minimum on the curves of wear rate versus sliding velocity. SEM morphologies of worn surfaces and debris were observed. Phases in the debris were analyzed by means of XRD spectra.

  18. A Novel Fully Depleted Air AlN Silicon-on-Insulator Metal-Oxide-Semiconductor Field Effect Transistor

    Institute of Scientific and Technical Information of China (English)

    YANG Yuan; GAO Yong; GONG Peng-Liang

    2008-01-01

    @@ A novel fully depleted air AlN silicon-on-insulator (SOI) metal-oxide-semiconductor field effect transistor (MOS-FET) is presented, which can eliminate the self-heating effect and solve the problem that the off-state current of SOI MOSFETs increases and the threshold voltage characteristics become worse when employing a high thermal conductivity material as a buried layer. The simulation results reveal that the lattice temperature in normal SOI devices is 75K higher than the atmosphere temperature, while the lattice temperature is just 4K higher than the atmosphere temperature resulting in less severe self-heating effect in air AlN SOI MOSFETs and AlN SOI MOSFETs. The on-state current of air AlN SOI MOSFETs is similar to the AlN SOI structure, and improves 12.3% more than that of normal SOI MOSFETs. The off-state current of AlN SOI is 6.7 times of normal SOI MOSFETs, while the counterpart of air AlN SOI MOSFETs is lower than that of SOI MOSFETs by two orders of magnitude. The threshold voltage change of air AlN SOI MOSFETs with different drain voltage is much less than that of AlN SOI devices, when the drain voltage is biased at 0.8 V, this difference is 28mV, so the threshold voltage change induced by employing high thermal conductivity material is cured.

  19. Cuando la "puesta en el juego" es un hijo que aún no ha nacido.

    Directory of Open Access Journals (Sweden)

    Giuliana Prata

    1990-01-01

    Full Text Available Los juegos de la pareja pueden influir en sus "puestas" un hijo que no ha nacido o que ni siquiera ha sido concebido. Síntomas tales como esterilidad, abortos espontáneos o muertes del niño durante el parto son examinados en este artículo a la luz de esta hipótesis.

  20. High-temperature oxidation behavior of Ti3AlC2 in air

    Institute of Scientific and Technical Information of China (English)

    XU Xue-wen; LI Yang-xian; ZHU Jiao-qun; MEI Bing-chu

    2006-01-01

    Not only the isothermal oxidation behaviors at 900-1 300 ℃ for 20 h in air of bulk Ti3AlC2 with 2.8% TiC which was sintered by hot pressing with the additive of silicon,but also the cyclic oxidation behavior at 1 100-1 300 °C for 30 cycles,were investigated by using TG,XRD,SEM. The isothermal and cyclic oxidation behaviors generally follow a parabolic rate law. The parabolic rate constants of the former increased from 1.39×10-10 kg2/(m4·s) at 900 ℃ to 5.56×10-9 kg2/(m4·s) at 1 300 ℃. The calculated activation energy is 136.45 kJ/mol. The oxidation products are á-Al2O3 and little TiO2 at 900-1 000 ℃,however when the temperature is raised up to 1 200 ℃,TiO2 partially reacts to Al2TiO5,and the reaction is completed at 1 300 ℃. This demonstrates that Ti3AlC2 has excellent oxidation resistance and good thermal shock because the dense continuous oxide scale consists of mass á-Al2O3 and little TiO2 and/or Al2TiO5. Generally,the oxide scale is grown by the inward diffusion of O2- and the outward diffusion of Ti4+ and Al3+.

  1. Puesta al día de la colaboración científico-técnica española del I.E.T.C.C. con Iberoamérica en el campo del cemento y del hormigón

    Directory of Open Access Journals (Sweden)

    Calleja, José

    1981-03-01

    Full Text Available Not available

    Se trata de actualizar la exposición de la labor llevada a cabo durante los años 1978 a 1980 por el autor de este trabajo en Brasil y en Argentina, a invitación personal de entidades oficiales de ambos países relacionadas con los campos de la docencia, de la ingeniería, dela construcción y de sus materiales. Labor consistente en el desarrollo de cursos, conferencias, coloquios y mesas redondas sobre temas relativos a la tecnología y a la durabilidad del cemento y del hormigón, y al empleo racional de los cementos en los diferentes tipos de obras, como solución a los problemas que el hormigón puede presentar en ellas. Dicha labor se presenta en forma resumida, sin perjuicio de que una buena parte de ella se ofrezca desarrollada in extenso en otras publicaciones técnicas.

  2. The effect of grain size on aluminum anodes for Al-air batteries in alkaline electrolytes

    Science.gov (United States)

    Fan, Liang; Lu, Huimin

    2015-06-01

    Aluminum is an ideal material for metallic fuel cells. In this research, different grain sizes of aluminum anodes are prepared by equal channel angular pressing (ECAP) at room temperature. Microstructure of the anodes is examined by electron backscatter diffraction (EBSD) in scanning electron microscope (SEM). Hydrogen corrosion rates of the Al anodes in 4 mol L-1 NaOH are determined by hydrogen collection method. The electrochemical properties of the aluminum anodes are investigated in the same electrolyte using electrochemical impedance spectroscopy (EIS) and polarization curves. Battery performance is also tested by constant current discharge at different current densities. Results confirm that the electrochemical properties of the aluminum anodes are related to grain size. Finer grain size anode restrains hydrogen evolution, improves electrochemical activity and increases anodic utilization rate. The proposed method is shown to effectively improve the performance of Al-air batteries.

  3. Effect of alumina short fiber and air-cooling processing on solidification microstructure and tensile properties of Al2O3/Al-15Si composites

    Institute of Scientific and Technical Information of China (English)

    张学习; 王德尊; 姚忠凯

    2002-01-01

    The effect of microstructure variation by addition of alumina short fiber and optimization of tensile properties by air-cooling processing in Al2O3/Al-15Si composites were studied. The results show that in Al-15Si alloy matrix composites with 14% and 30%(volume fraction) fiber, the primary silicon is hardly refined, but the eutectic silicon is effectively refined and granulated. Granulation of some eutectic silicon mainly happens in fiber segregation areas. Refining and granulation of the eutectic silicon are related to the physical constraint arising from the fiber. After the 30%Al2O3/Al-15Si composite was remelted and air-cooled, the number of the eutectic silicon on the surface of the fiber increases, which results in the improvement of fiber/matrix interface and tensile properties for the as-cast composite. Air-cooling processing may be reliable for the optimization of the microstructure and properties of fiber reinforced hypereutectic Al-15Si alloy composites.

  4. Uniatlantes: la puesta en marcha de un proyecto virtual

    Directory of Open Access Journals (Sweden)

    Natalia Menéndez

    2002-04-01

    Full Text Available Los objetivos de este artículo son mostrar cómo se creó la empresa virtual de servicios lingüísticos Uniatlantes, exponer las motivaciones que impulsaron a sus fundadoras, licenciadas en Filología Inglesa, a aplicar sus conocimientos al desarrollo de un proyecto que, en principio, se alejaba un poco de su orientación universitaria, y explicar, de manera muy general, los servicios que conforman la oferta de Uniatlantes, así como aquellos proyectos que se espera poder llevar a cabo en un futuro próximo.

  5. Un repaso por el origen y una mirada puesta en el presente. ¿Qué tiene para ofrecernos el periodismo digital?

    Directory of Open Access Journals (Sweden)

    Lic. Mónica Tejera Cruz

    2002-01-01

    Full Text Available El fenómeno de Internet no pasa inadvertido a ningún mortal. Mucho menos cuando se dedican al mundo de la comunicación. Para los periodistas, la aparición de la Red y el desarrollo de la Word Wide Web ha venido a coquetear con su ansia de comunicar, informar, expresar; a fin de cuentas, transmitir mensajes. El desarrollo de la tecnología ha puesto en bandeja de plata un nuevo soporte que permite llegar a las personas a través de los ordenadores y abre un universo de posibilidades para explotar, pero que al mismo tiempo hay que entender y asimilar. Un repaso hacia el origen de un nuevo medio con el que ya convivimos y una mirada puesta en el presente de su desarrollo vertiginoso.

  6. Pasos hacia la puesta en valor turístico-patrimonial del Pukara de la Cueva, Humahuaca, Jujuy, Argentina

    Directory of Open Access Journals (Sweden)

    Paola Silvia Ramundo

    2014-06-01

    Full Text Available Este trabajo constituye una puesta al día sobre la problemática de la protección del patrimonio arqueológico del Pukara de La Cueva, Departamento de Humahuaca, Provincia de Jujuy, Noroeste Argentino (NOA. Para ello analizamos los resultados de los trabajos antropológicos-arqueológicos preliminares y evaluamos la realización de otros estudios de campo a efectuar en el marco de proyectos preexistentes, que implicará finalmente la elaboración de un circuito turístico con diversas instancias, entre las que se incluye un centro interpretativo o museo de sitio al pie del Pukara cuyos salones ya están construidos. Cada uno de estos pasos se efectúa y efectuará con la participación de un equipo interdisciplinario y la colaboración de los pobladores locales. Al mismo tiempo que metodológicamente buscamos cumplir dos premisas, la autogestión e interculturalidad. Pensamos que la concreción de un proyecto de esta naturaleza coadyuvará: 1 a la creación de conciencia de protección patrimonial y contribuirá a que los habitantes de la región se beneficien al incluir esta área dentro del circuito turístico de la Quebrada de Humahuaca, que actualmente no la abarca, 2 a evaluar los procesos de modificación culturales y naturales a los que está sujeto este registro arqueológico, que lo transforman constantemente y que definen un nuevo paisaje arqueológico; y 3 a valorar el registro arqueológico en función del paisaje natural que lo rodea y de las comunidades locales en las que se encuentra inserto.

  7. La puesta en obra de paneles pesados prefabricados

    Directory of Open Access Journals (Sweden)

    Pouyés, M. Cl.

    1971-05-01

    Full Text Available This article deals, firstly with the lifting of precast panels at the site, both in reference to the machinery used and to the trained labour carrying out the work. Secondly, the actual positioning of the panels is described, and a brief reference to their stability is included. Special attention is given of the question of safety, in this type of work.En este artículo se trata primeramente de la elevación de la obra de elementos prefabricados, atendiendo tanto a la parte de las máquinas como a la del personal. Después se estudia la colocación de los elementos prestando atención al apuntalamiento con un pequeño estudio de la estabilidad. En lo que a la seguridad atañe, es constante en todo el artículo la atención que se lé presta.

  8. Medición de cortisol y sus fracciones: Una puesta al día

    OpenAIRE

    Patricia Maidana; Bruno, Oscar D.; Viviana Mesch

    2013-01-01

    La determinación del cortisol sérico total forma parte fundamental de la exploración bioquímica de la función adrenocortical. Dado que esta hormona circula en plasma, en parte unida a proteínas de transporte y en parte en estado libre, existe la posibilidad de realizar la determinación de sus diferentes fracciones no solo en sangre sino también en orina, saliva y otros fluidos biológicos. Es posible realizar tanto determinaciones basales como pruebas funcionales y de esta manera evaluar la se...

  9. Microstructure of Suspension Plasma Spray and Air Plasma Spray Al2O3-ZrO2 Composite Coatings

    Science.gov (United States)

    Chen, Dianying; Jordan, Eric H.; Gell, Maurice

    2009-09-01

    Al2O3-ZrO2 coatings were deposited by the suspension plasma spray (SPS) molecularly mixed amorphous powder and the conventional air plasma spray (APS) Al2O3-ZrO2 crystalline powder. The amorphous powder was produced by heat treatment of molecularly mixed chemical solution precursors below their crystallization temperatures. Phase composition and microstructure of the as-synthesized and heat-treated SPS and APS coatings were characterized by XRD and SEM. XRD analysis shows that the as-sprayed SPS coating is composed of α-Al2O3 and tetragonal ZrO2 phases, while the as-sprayed APS coating consists of tetragonal ZrO2, α-Al2O3, and γ-Al2O3 phases. Microstructure characterization revealed that the Al2O3 and ZrO2 phase distribution in SPS coatings is much more homogeneous than that of APS coatings.

  10. Creación y puesta en marcha de una Empresa de servicios profesionales

    OpenAIRE

    Cobos Tejero, Antonio

    2010-01-01

    Con este trabajo se pretende definir la creación y puesta en marcha de una empresa dedicada a la prestación de servicios profesionales para dar respuesta a las necesidades industriales actuales del sector del transporte en el tejido industrial catalán. Con esta finalidad se presenta el plan de empresa, que abarca desde la definición de la idea a desarrollar hasta la forma concreta de llevarla a la práctica. En la primera fase de este trabajo, como punto de partida de todo proyecto empr...

  11. Oxidation resistance in LBE and air and tensile properties of ODS ferritic steels containing Al/Zr elements

    Energy Technology Data Exchange (ETDEWEB)

    Gao, R. [Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China); Xia, L.L. [Armor Forces Department, Army Officer Academy of PLA, Hefei 230031, Anhui (China); Zhang, T.; Wang, X.P. [Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China); Fang, Q.F., E-mail: qffang@issp.ac.cn [Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China); Liu, C.S. [Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)

    2014-12-15

    The effects of Al and Zr addition on improvement of oxidation resistance in lead–bismuth eutectic (LBE) and in air as well as the tensile properties were investigated for the oxide dispersion strengthened (ODS) steels. The 16Cr–4Al–0.8Zr–ODS steel samples were fabricated by a sol–gel method combining with spark plasma sintering technique. The tests in LBE at 600 °C for 1000 h indicate the good oxidation resistance comparing with the specimens without Zr/Al elements. The samples also exhibit superior oxidation resistance in air due to formation of dense and continuous aluminum oxide film. Minor Zr addition prevents the Al element induced coarsening of the oxide particles in ODS steels and significantly improves the ultimate tensile stress and total elongation of the samples.

  12. Why does air passage over forest yield more rain? Alternative interpretations of Spracklen et al. 2012 Nature 489: 282

    CERN Document Server

    Makarieva, Anastassia M; Sheil, Douglas; Nobre, Antonio D; Bunyard, Peter; Li, Bai-Lian

    2013-01-01

    Spracklen et al. recently presented a pan-tropical study of rainfall and land-cover that showed that satellite-derived rainfall measures were positively correlated with the degree to which model-derived air trajectories had been exposed to forest cover. This result confirms the influence of vegetation on regional rainfall patterns suggested in previous studies. However, we find that the conclusion of Spracklen et al. -- that differences in rainfall reflect air moisture content resulting from evapotranspiration -- appears undermined by methodological inconsistencies. We discuss some alternative explanations that require investigation. These include the distinct role of forest evapotranspiration in creating low pressure systems that draw moisture from the oceans to the continental hinterland. This alternative physical process is consistent with the empirical findings of Spracklen et al. but underlines a greater potential danger of forest loss than is suggested by their analyses of moisture recycling.

  13. Air sparging as a supporting measure to redevelopment of a LCFC-contaminated industrial site; Air-Sparging als begleitende Sanierungsmassnahme an einem LCKW-kontaminierten Industriestandort

    Energy Technology Data Exchange (ETDEWEB)

    Breh, W.; Suttheimer, J. [Karlsruhe Univ. (T.H.) (Germany). Lehrstuhl fuer Angewandte Geologie; Holub, B. [G.U.T Linz (Austria)

    1998-12-31

    On a company ground in Vorchdorf, Austria, from the 23{sup rd} to 26{sup th} of July 1996 an air-sparging experiment has been carried out as a supporting measure to a running redevelopment of an LCKW-contamination case. On this occasion compressed air, from which the oil had been extracted, was blown into the contaminated aquifer through a well with a maximum excess pressure of 0,6 MPa. The blowing-in of compressed air caused a mobilisation of the harmful substances in the ground water and the soil air. As a result circa 2,7 kg LCKW could be removed from the underground through neighbouring ground water and soil air wells. For the observed period of time this meant a tripling of the rate of discharge. On the basis of the obtained data we suggested a routine interval of blowing in compressed air into the well 1516. A blowing-in of compressed air into the highly contaminated wells 1617 and 1625 can not be realised until the construction of upstream situated injection wells, because of the danger of an uncontrollable spread of the harmful substances. (orig.) [Deutsch] Auf einem Firmengelaende in Vorchdorf, Oesterreich, wurde vom 23.07. bis 26.07.1996 ein Air-Sparging-Versuch als unterstuetzende Massnahme zur laufenden hydraulisch-pneumatischen Sanierung eines LCKW-Schadensfalles durchgefuehrt. Hierbei wurde entoelte Druckluft ueber einen Brunnen mit einem maximalen Ueberdruck von 600 mbar in den kontaminierten Aquifer eingeblasen. Die Drucklufteinblasung fuehrte zu einer Mobilisierung von Schadstoffen im Grundwasser und in der Bodenluft, so dass ueber benachbarte Grundwasser- und Bodenluftfoerderbrunnen ca. 2,7 kg LCKW aus dem Untergrund entfernt werden konnten. Fuer den Beobachtungszeitraum bedeutet dies eine Verdreifachung des Schadstoffaustrags. Aufgrund der gewonnenen Daten wird ein routinemaessiger Intervallbetrieb der Drucklufteinblasung in einen der Brunnen vorgeschlagen. Fuer zwei kontaminierte Brunnen ist eine Drucklufteinblasung wegen der Gefahr einer

  14. Effect of Air Pollutants on Rain Water Characteristics in Hammam Al-Aleel District/ Al-Erej Village South of Mosul City

    Directory of Open Access Journals (Sweden)

    Ayad F. Qasim

    2012-06-01

    Full Text Available This study focused on Hammam Al-Aleel district/ Al-Erej village which is located south of Mosul city. This area has been suffering from spreading the air-pollutants resulted from the chimneys of Hammam Al-Aleel cement factories. Different areas were chosen for collecting samples of the rain water from December 2008 to March 2009. The study showed that rain-water is generally basic. The tests show an increase in ( EC, Mg+2, Ca+2, Cl-1, SO4-2 and NO-1,  due to the air pollutants emitted from local industries. The concentration of heavy elements represented by  Pb and Cd were high and this increase is due to the source of these elements from burning of the crude oil which is used in running the rotating kiln to produce the clinker in cement factory, In addition to the fuel used for  running vehicle and the friction between tires and  road.

  15. Transient analysis for grounding systems considering the ground ionization; Analisis transitorio de sistemas de puesta a tierra considerando la ionizacion del suelo

    Energy Technology Data Exchange (ETDEWEB)

    Salgado Salgado, Luis Alberto

    2008-06-15

    sistema de puesta a tierra. Lo anterior origina el fenomeno de ionizacion del suelo, lo cual provoca una disminucion de la impedancia de la red de tierra, modificando su comportamiento. En este trabajo de tesis, se presenta un modelo computacional para evaluar el comportamiento transitorio de un sistema de puesta a tierra, sujeto a corriente de magnitud y frecuencia tales que dan lugar al fenomeno de ionizacion del suelo. Modelo esta basado en la teoria de lineas de transmision multiconductoras y el analisis transitorio de la red de tierra se efectua en el dominio de la frecuencia. La conversion al dominio del tiempo se realiza a traves de la Transformada Rapida de Fourier Inversa. Con el modelo desarrollado se analizaron varios casos de estudio con electrodos verticales y mallas de puesta a tierra de diferentes dimensiones. Para los casos de estudio se consideraron diferentes magnitudes de campo electrico critico, suelos con diferentes valores de resistividad y se utilizaron corrientes con distintos valores de magnitud y frecuencia. Los resultados obtenidos que aqui se presentan, fueron analizados y validados con resultados de otros modelos y mediciones reales publicadas en la literatura.

  16. Aportación al estudio de los yacimientos líticos postpaleolíticos al aire libre en Navarra

    Directory of Open Access Journals (Sweden)

    Javier ARMENDÁRIZ MARUJA

    2009-11-01

    Full Text Available RESUMEN: En este artículo se aborda la problemática de los yacimientos de sílex al aire libre en Navarra, proponiendo tras un estudio comparativo, una sistematización cronológica que va desde el Neolítico Pleno a la Edad del Bronce. Paralelamente se define un nuevo útil lítico (Elemento sobre hoja recortada-E.H.R. y se analiza el fenómeno de las llamadas «hachas votivas».ABSTRACT: This article deals with the problem of open-air with remains of flintstone tools in Navarra. Through a comparative survey, it is given a chronology which dates from the Neolithic to the Bronze Age. We also define a new lithic tool (E.H.R. and we analyse the subject of the so named «votive axes».

  17. Heat transfer enhancement using air-atomized spray cooling with water-Al2O3 nano-fluid

    International Nuclear Information System (INIS)

    The study deals with the air-atomized spray cooling using nano-fluid as the cooling media for high heat flux applications. The nano-fluid has been prepared by commercial Al2O3 particles of diameter less than 13 nm and water. Heat transfer study has been carried out on a pre-heated steel specimen of dimensions 100 mm x 100 mm x 6 mm. The initial temperature of the plate which was subjected to air-atomized spray cooling was over 900 deg. C. Various coolants consisting of 0.1% volumetric concentration of water -Al2O3 mixture, with or without a dispersing agent (surfactant) were used for the study. The dispersing agents used are sodium dodecyl sulphate (SDS) and polyoxyethylene (20) sorbitan monolaurate (Tween 20). Inverse heat conduction software INTEMP has been used for estimating the surface heat flux and temperatures taking into account the measured internal temperature histories by the thermocouples during the cooling process. The results obtained using nano-fluid coolants are compared with that of the results where pure water (filtered potable water) is used as a coolant. The analyses reveal that the cooling rate, critical heat flux and heat transfer coefficients are significantly enhanced when nano-fluids are used as coolants in air-atomized spray process. Also, the nano-fluid coolants with dispersing agent shows a better enhancement of heat transfer over that of the nano-fluid without the dispersing media. The nano-fluid with dispersing agent Tween 20 is found more effective than that of its counterpart. Overall, the percentage enhancement in cooling rate of all these nano-fluids compared with pure water (filtered potable water) is 10.2% for water-Al2O3, 18.6% for water-Al2O3-SDS, and up to 32.3% for water-Al2O3 -Tween 20. (authors)

  18. Isothermal oxidation behavior of Ti3Al-based alloy at 700-1 000 ℃ in air

    Institute of Scientific and Technical Information of China (English)

    QIAN Yu-hai; LI Mei-shuan; LU Bin

    2009-01-01

    The isothermal oxidation behavior of a Ti3Al-based alloy (Ti-24Al-14Nb-3V-0.5Mo-0.3Si, molar fraction, %) at 700- 1 000 ℃ in air was investigated. The oxidation kinetics of tested alloy approximately obeys the parabolic law, which shows that the oxidation process is dominated by the diffusion of ions. The oxidation diffusion activity energy is 241.32 kJ/mol. The tested alloy exhibits good oxidation resistance at 700 ℃. However, when the temperature is higher than 900 ℃, the oxidation resistance becomes poor. The XRD results reveal that the oxide product consists of a mixture of TiO2 and Al2O3. Serious crack and spallation of oxide scale occur during cooling procedure after being exposed at 1 000 ℃ in air for 16 h. According to the analysis of SEM/EDS and XRD, it is concluded that the Al2O3 oxide forms at the initially transient oxidation stage and most of it keeps in the outer oxide layer during the subsequent oxidation procedure.

  19. EMISIONES AL AIRE DE LA COMBUSTION DE LLANTAS USADAS (SPANISH VERSION)

    Science.gov (United States)

    The report discusses air emissions from two types of scrap tire combustion: uncontrolled and controlled. Uncontrolled sources are open tire fires, which produce many unhealthful products of incomplete combustion and release them directly into the atmosphere. Controlled combustion...

  20. Characterization and Wear Behavior of Heat-treated Ni3Al Coatings Deposited by Air Plasma Spraying

    Science.gov (United States)

    Mehmood, K.; Rafiq, M. A.; Nusair Khan, A.; Ahmed, F.; Mudassar Rauf, M.

    2016-07-01

    Air plasma spraying was utilized to deposit Ni3Al coatings on AISI-321 steel substrate. The deposited coatings were isothermally heat-treated at various temperatures from 500 to 800 °C for 10, 30, 60, and 100 h. The x-ray diffraction analysis revealed NiO formation in Ni3Al at 500 °C after 100 h, and the percentage of NiO increased with increasing exposure time and temperature. The hardness of the coating increased with the formation of NiO. The DSC test showed the formation of minor phases, Al3Ni and Al3Ni2, within the coating along with the major phase Ni3Al. TGA revealed a slowing down of the oxidation rate upon surface oxide formation. The pin-on-disk wear test on the as-sprayed and heat-treated coatings showed that wear rate and coefficient of friction decreased with an increase in the NiO phase content.

  1. Study on the isothermal oxidation behavior in air of Ti3AlC2 sintered by hot pressing

    Institute of Scientific and Technical Information of China (English)

    XU; Xuewen; LI; Yangxian; MEI; Bingchu; ZHU; Jiaoqun; LIU; Heyan

    2006-01-01

    The isothermal oxidation behavior at 900―1300℃ for 20 h in air of bulk Ti3AlC2 with 2.8 wt% TiC sintered by means of hot pressing was investigated in the work. The isothermal oxidation behavior generally followed a parabolic rate law. The parabolic rate constants increased from 1.39×10-10 kg2·m-4·s-1 at 900℃ to 5.56×10-9 kg2·m-4·s-1 at 1300℃. The calculated activation energy was 136.45 kJ/mol. It was demonstrated that Ti3AlC2 had excellent oxidation resistance due to the continuous, dense and adhesive protect scales consisted of a mass of α-Al2O3 and a little of TiO2 and/or Al2TiO5. In principle, the oxide scale was grown by the inward diffusion of O2- and the outward diffusion of Ti4+ and Al3+. The rapid outward diffusion of cations usually resulted in the formation of cracks, gaps, and holes.

  2. Public Communication on Urban Air Pollution; La Comunicacion al Publico sobre Contaminacion Atmosferica Urbana

    Energy Technology Data Exchange (ETDEWEB)

    Otra, C.; Sala, R.

    2014-02-01

    The aim of this study was to analyze the state of public information in the field of air pollution in Spain. We conducted semi-structured interviews with members of public agencies, technical experts, scientists, and members of non governmental associations together with a documentary analysis of air pollution documents (plans, reports, etc.). We tried to characterize the information actions on air quality carried out in Spanish cities during the last years. In the results section we first analyze the ideas, concerns and considerations that underlie the actions of public information on air pollution, as well as the main challenges of public communication on this subject, according to the documents and the different experts consulted. We analyze the various contents of information transmitted nowadays (on levels of pollution, health impacts and mitigation or protection actions), as well as the mechanisms by which it is communicated, both continuously and in the case of threshold overcoming episodes. We also review the different media used to communicate air pollution information (Internet, mobile applications and other forms) and other issues such as information audiences, or the perceived impacts of information provided. Finally, the implications for more diverse and effective public involvement strategies in air pollution are discussed. (Author)

  3. Working Group 'Air pollution abatement' of the University of Stuttgart -ALS. Annual report 1990

    International Nuclear Information System (INIS)

    Despite considerable efforts for air pollution abatement - examples are here desulphurization and nitrogen removal in power and large combustion plants as well as catalytic converters for automobiles there are still many problems to solve. Many small and medium-size companies still have to reduce production-related pollutant emissions, traffic still is a major source of pollutants. Air pollution abatement in the new Federal states and other Eastern European countries is a particularly urgent task and reductions of CO2 emissions from energy production processes with fossil fuels are not least a great challenge. Apart from industry, legislation and administration especially science is called upon to find solutions to these problems. The university of Stuttgart takes up the challenge. Numerous institutes - 17 of 8 faculties -united in the working group ''air pollution abatement'' of the university of Stuttgart which carries out in interdisciplinary cooperation research work in the area of air pollution abatement. In this annual report activities of individual member states institutes in the area of air pollution abatement (fields of study, current research projects, cooperations and publications in 1991) as well as joint projects are presented. (orig./KW)

  4. Precipitation of α2 Phase in α+β Solution-Treated and Air-cooled Ti-Al-Sn-Zr-Mo-Si-Nd Alloys

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    A series of Ti-Al-Sn-Zr-Mo-Si-Nd alloys with various content of Al were solution treated in α+β phase field and air-cooled.The precipitation of α2 phase in cooling was investigated by transmission electron microscopic analysis.The precipitation characteristic of α2 phase was discussed. The precipitation of α2 phase would proceed by the nucleation and growth of α2 phase dependent on the diffusion of Al atoms. And a comparison on the difference of precipitation of α2 phase was carried out under the conditions of air-cooling and quenching in water.The investigation showed that the air-cooling and even quenching could supply enough time for the precipitation and growth of α2 phase when Al content reached a certain value even though far away from the stoichiometric composition of TisAl.

  5. La gran vida al aire libre PSA (:30) (The Great Outdoors)

    Centers for Disease Control (CDC) Podcasts

    2016-05-31

    Un hombre y una mujer se están alistando para irse a una caminata. La mujer le recuerda al hombre que se proteja del sol.  Created: 5/31/2016 by National Center for Chronic Disease Prevention and Health Promotion (NCCDPHP).   Date Released: 5/31/2016.

  6. Los nuevos desafios de la puesta en práctica de las políticas de saneamiento ambiental

    Directory of Open Access Journals (Sweden)

    Horacio Alejandro Chamizo Garcia

    2009-01-01

    del saneamiento ambiental desde una perspectiva compleja. Así mismo, se evidencia el papel de las relaciones de agencia en condiciones de cuasimercados y su influencia en la conformación de redes de actores. Los hallazgos explican integradamente los principales factores que influyen durante la puesta práctica políticas públicas de gran relevancia para la salud de la población y la reducción de inequidades sociales.

  7. Improved Thermally Grown Oxide Scale in Air Plasma Sprayed NiCrAlY/Nano-YSZ Coatings

    International Nuclear Information System (INIS)

    Oxidation has been considered as one of the principal disruptive factors in thermal barrier coating systems during service. So, oxidation behavior of thermal barrier coating (TBC) systems with nano structured and micro structured YSZ coatings was investigated at 1000 degree c for 24 h, 48 h, and 120 h. Air plasma sprayed nano-YSZ coating exhibited a tri modal structure. Microstructural characterization also demonstrated an improved thermally grown oxide scale containing lower spinels in nano-TBC system after 120 h of oxidation. This phenomenon is mainly related to the unique structure of the nano-YSZ coating, which acted as a strong barrier for oxygen diffusion into the TBC system at elevated temperatures. Nearly continues but thinner Al2O3 layer formation at the NiCrAlY/nano-YSZ interface was seen, due to lower oxygen infiltration into the system. Under this condition, spinels formation and growth on the Al2O3 oxide scale were diminished in nano-TBC system compared to normal TBC system.

  8. Investigation of long pulse laser induced flame on Al in air using optical interferometry

    Science.gov (United States)

    Zhang, Hongchao; Lu, Jian; Shen, Zhonghua; Ni, Xiaowu

    2013-05-01

    The process of long pulse laser(1ms) interaction with the aluminum plate was analyzed using Mach-Zehnder interferometer in this paper. A continuous semiconductor laser with about 50mW power and 532nm wavelength was used to detect the flame which induced by long pulse laser interaction with the aluminum plate. A high speed camera was used to capture the interferograms. The exposure time of the high speed camera is about 2 microseconds. And the frame rate is 2130fps. The high-speed camera and the long pulse laser pulse was synchronously controlled by the four-channel digital delay (Stanford Research Systems DG535).The FFT(Fast Fourier transform ) analysis is applied to extract the phase of the interferograms. The results provide an understanding of the process of long pulse laser drilling of the Al target.

  9. Air

    Science.gov (United States)

    ... house) Industrial emissions (like smoke and chemicals from factories) Household cleaners (spray cleaners, air fresheners) Car emissions (like carbon monoxide) *All of these things make up “particle pollution.” They mostly come from cars, trucks, buses, and ...

  10. A low cost, disposable cable-shaped Al-air battery for portable biosensors

    Science.gov (United States)

    Fotouhi, Gareth; Ogier, Caleb; Kim, Jong-Hoon; Kim, Sooyeun; Cao, Guozhong; Shen, Amy Q.; Kramlich, John; Chung, Jae-Hyun

    2016-05-01

    A disposable cable-shaped flexible battery is presented using a simple, low cost manufacturing process. The working principle of an aluminum-air galvanic cell is used for the cable-shaped battery to power portable and point-of-care medical devices. The battery is catalyzed with a carbon nanotube (CNT)-paper matrix. A scalable manufacturing process using a lathe is developed to wrap a paper layer and a CNT-paper matrix on an aluminum wire. The matrix is then wrapped with a silver-plated copper wire to form the battery cell. The battery is activated through absorption of electrolytes including phosphate-buffered saline, NaOH, urine, saliva, and blood into the CNT-paper matrix. The maximum electric power using a 10 mm-long battery cell is over 1.5 mW. As a demonstration, an LED is powered using two groups of four batteries in parallel connected in series. Considering the material composition and the cable-shaped configuration, the battery is fully disposable, flexible, and potentially compatible with portable biosensors through activation by either reagents or biological fluids.

  11. Air

    International Nuclear Information System (INIS)

    In recent years several regulations and standards for air quality and limits for air pollution were issued or are in preparation by the European Union, which have severe influence on the environmental monitoring and legislation in Austria. This chapter of the environmental control report of Austria gives an overview about the legal situation of air pollution control in the European Union and in specific the legal situation in Austria. It gives a comprehensive inventory of air pollution measurements for the whole area of Austria of total suspended particulates, ozone, volatile organic compounds, nitrogen oxides, sulfur dioxide, carbon monoxide, heavy metals, benzene, dioxin, polycyclic aromatic hydrocarbons and eutrophication. For each of these pollutants the measured emission values throughout Austria are given in tables and geographical charts, the environmental impact is discussed, statistical data and time series of the emission sources are given and legal regulations and measures for an effective environmental pollution control are discussed. In particular the impact of fossil-fuel power plants on the air pollution is analyzed. (a.n.)

  12. Una metodología interdisciplinaria, la puesta en turismo de un área natural protegida y habitada

    Directory of Open Access Journals (Sweden)

    Kelly Escobar Jiménez

    2007-11-01

    Full Text Available Se pretende en este artículo, primero, mostrar pautas de la investigación interdisciplinaria para la puesta en turismo de un espacio habitado de alto valor ecológico (ehave, luego esbozar algunas consideraciones teóricas para el análisis de la participación comunitaria en los proyectos de desarrollo turístico, y por último intentamos hacer una reflexión sobre la aplicación de estos elementos teóricos y metodológicos en el estudio diagnóstico de la puesta en turismo de la vipis. En la vipis se utiliza el ecosistema de manglar como un puente entre los diferentes actores del parque natural y como un vínculo entre las diferentes disciplinas involucradas en el proyecto de investigación –economía, antropología, biología, arquitectura y turismo –. Todo esto con la intensión de hacer un estudio interdisciplinario para proponer alternativas de desarrollo respetuosas con las comunidades locales y el medio ambiente de la región.

  13. PLAN DE NEGOCIO PARA LA CREACIÓN Y PUESTA EN MARCHA DE UNA EMPRESA DE TURISMO RURAL EN LA COMARCA DE LOS SERRANOS

    OpenAIRE

    HERRERO MONZON, GLORIA

    2013-01-01

    En el presente Trabajo Final de Carrera (TFC) se presenta un Plan de empresa para la creación y puesta en marcha de una empresa de turismo rural en la provincia de Valencia, más concretamente, en la comarca de Los Serranos. Se ha elegido la elaboración de un plan de empresa ya que esta herramienta permite analizar de forma detallada las variables más importantes que influyen en la en la puesta en marcha del negocio. Para ello, se parte de un análisis general del sector turístico rural hast...

  14. OPINIONES DE LOS ESTUDIANTES DE PSICOLOGÍA DE LA UNIVERSIDAD DE BUENOS AIRES SOBRE LA PRESCRIPCIÓN DE PSICOFÁRMACOS POR PSICÓLOGOS

    Directory of Open Access Journals (Sweden)

    Ezequiel Benito

    2009-01-01

    Full Text Available En el tratamiento de los trastornos mentales, siempre se reconoció que la medicación -el tratamiento de intervención biológica- era exclusividad de los psiquiatras. Actualmente, esta situación ha sido puesta en discusión en Estados Unidos a través del movimiento de la prescripción, como se denomina al grupo de psicólogos que reclaman capacidad legal para prescribir psicofármacos. Esta posibilidad, si bien se ofrece como una alternativa de tratamiento integral no deja de generar grandes críticas. El presente trabajo indaga las opiniones de los estudiantes de Psicología de la Universidad de Buenos Aires, en Argentina, en relación con los principales argumentos a favor y en contra esbozados por Norcross (2005

  15. Estimation of air gap and heat transfer coefficient at different faces of Al and Al-Si castings solidifying in permanent mould

    Energy Technology Data Exchange (ETDEWEB)

    Taha, M.A.; El-Mahallawy, N.A. [Ain Shams University, Cairo (Egypt). Dept. of Design and Production Engineering; El-Mestekawi, M.T.; Hassan, A.A. [Higher Education Institute, Tenth Ramadan City (Egypt). Dept. of Mechanical Engineering

    2001-07-01

    In the casting processes, the heat transfer coefficient at the metal/mould interface is an important controlling factor for the solidification rate and the resulting structure and mechanical properties. Several factors interact to determine its value, among which are the type of metal/alloy, the mould material and surface conditions, the mould and pouring temperatures, casting configuration, and the type of gases at the interfacial air gap formed. It is also time dependent. In this work, the air gap formation was computed using a numerical model of solidification, taking into consideration the shrinkage and expansion of the metal and mould, gas film formation, and the metallostatic pressure. The variation of the air gap formation and heat transfer coefficient at the metal mould interface are studied at the top, bottom, and side surfaces of AI and AI-Si castings in a permanent mould in the form of a simple rectangular parallelepiped. The results show that the air gap formation and the heat transfer coefficient are different for the different casting surfaces. The bottom surface where the metallostatic pressure makes for good contact between the metal and the mould exhibits the highest heat transfer coefficient. For the sidewalls, the air gap was found to depend on the casting thickness as the larger the thickness the larger the air gap. The air gap and heat transfer coefficient also depend on the surface roughness of the mould, the alloy type, and the melt superheat. The air gap is relatively large for low values of melt superheat. The better the surface finish, the higher the heat transfer coefficient in the first few seconds after pouring. For AI-Si alloys, the heat transfer coefficient increases with increasing Si content. (author)

  16. Effect of microwave and air drying of parboiled rice on stabilization of rice bran oil

    Directory of Open Access Journals (Sweden)

    Rizk, Laila F.

    1995-06-01

    Full Text Available Two rice varieties, Giza 175 (short grain and Giza 181 (long grain were partDoiled by soaking the grains at room temperature for 20 hours and steaming for 15 min then dried either at room temperature or by microwave. The results indicated that air and microwave drying significantly increased oil extraction in both rice bran varieties. Parboiling followed by air or microwave drying produced a slight change on protein, fiber and ash content of rice bran and reduced the development of free fatty acids (F.F.A. In oil bran. Microwave samples have less F.F.A. content than the corresponding samples air dried. Oils from the cold stored rice bran presented lower F.F.A. than the corresponding oil bran stored at room temperature. The ratio between total unsaturated fatty acids and total saturated ones (Tu/Ts decreased after air and microwave drying. Results also show that air drying increased the ratio of total hydrocarbons and total sterols (Tu/Ts in both varieties while microwave decreased it.

    Dos variedades de arroz, Giza 175 (grano corto y Giza 181 (grano largo se precocieron mediante la puesta en remojo de los granos a temperatura ambiente durante 20 horas y cocimiento al vapor durante 15 minutos, luego se secaron a temperatura ambiente o por microondas. Los resultados indicaron que el secado al aire y en microondas aumentó significativamente la extracción del aceite en ambas variedades de salvado de arroz. El precocido seguido del secado al aire o en microondas produjo un cambio pequeño en el contenido en proteína, fibra y ceniza y redujo el desarrollo de ácidos grasos libres (F.F.A. en el aceite de salvado. Las muestras secadas en microondas tuvieron un menor contenido en F.F.A. que las muestras correspondientes al secado en aire. Aceites de salvado de arroz almacenado en frió presentaron menor F.F.A. que los almacenados a temperatura ambiente. La relación entre ácidos grasos insaturados totales y los saturados totales (Tu/Ts disminuy

  17. Oxidation Resistance of Materials Based on Ti3AlC2 Nanolaminate at 600 °C in Air.

    Science.gov (United States)

    Ivasyshyn, Andrij; Ostash, Orest; Prikhna, Tatiana; Podhurska, Viktoriya; Basyuk, Tatiana

    2016-12-01

    The oxidation behavior of Ti3AlC2-based materials had been investigated at 600 °C in static air for 1000 h. It was shown that the intense increase of weight gain per unit surface area for sintered material with porosity of 22 % attributed to oxidation of the outer surface of the specimen and surfaces of pores in the bulk material. The oxidation kinetics of the hot-pressed Ti3AlC2-based material with 1 % porosity remarkably increased for the first 15 h and then slowly decreased. The weight gain per unit surface area for this material was 1.0 mg/cm(2) after exposition for 1000 h. The intense initial oxidation of Ti3AlC2-based materials can be eliminated by pre-oxidation treatment at 1200 °C in air for 2 h. As a result, the weight gain per unit surface area for the pre-oxidized material did not exceed 0.11 mg/cm(2) after 1000 h of exposition at 600 °C in air. It was demonstrated that the oxidation resistance of Ti3AlC2-based materials can be significantly improved by niobium addition. PMID:27506531

  18. CYCLIC OXIDATION OF Ti-48%Al-2%Cr-2%Nb-(0~1%)W ALLOYS BETWEEN 800 AND 1000°C IN AIR

    OpenAIRE

    SANG-HWAN BAK; DONG YI SEO; SEON-JIN KIM; JAE CHUN LEE; DONG BOK LEE

    2010-01-01

    Ti-48%Al-2%Cr-2%Nb-(0, 0.5, 1) at.%W alloys were synthesized via the powder metallurgical route, and cyclically oxidized at 800, 900, or 1000°C in air for up to 100 h in order to find the effects of W on their oxidation characteristics. At 800°C, they oxidized relatively slowly, and the scales were thin and adherent. At 900°C, the scales began to spall locally. At 1000°C, they spalled repetitively during oxidation. Cr, Nb, and W improved the cyclic oxidation resistance of TiAl alloys. The oxi...

  19. Experiencias de la instauración de normas relativas al contenido de plomo en aire y el agua, en los Estados Unidos de América

    Directory of Open Access Journals (Sweden)

    Davis J Michael

    2003-01-01

    Full Text Available En los Estados Unidos de América se ha logrado una disminución de la exposición a plomo de la población en general, gracias al establecimiento de diversas normas. En este artículo se destaca parte de los conocimientos adquiridos a través de la experiencia obtenida en este país en materia de plomo, en particular respecto al aire y al agua. Uno de los aspectos fundamentales es la posibilidad de contar con una base científica sólidamente establecida y claramente entendida, a partir de la cual se tomarán las medidas correspondientes. Los efectos secundarios de ciertas normas concernientes al aire ponen de manifiesto de qué manera los esfuerzos orientados a solucionar un problema pueden aportar beneficios en otras áreas, si bien pueden surgir consecuencias no deseadas, debido a la falta de previsión y de evaluación. Asimismo, en este documento se discuten las diferencias entre los enfoques centralizados y los descentralizados para el manejo de la exposición a plomo.

  20. Photoluminescence and abnormal reduction of Eu{sup 3+} ions in CaAl{sub 2}O{sub 4}:EU nanophosphors calcined in air atmosphere

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Yin; Chen, Jie [College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123 (China); Xu, Chuanyan [Suzhou Biomaterials and Advanced Manufacture Engineering Technology Research Center, Suzhou Dingan Technology Co. Ltd, Suzhou 215200 (China); Li, Yadong, E-mail: liyadong@suda.edu.cn [College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123 (China); Jin Seo, Hyo [Department of Physics and Interdisciplinary Program of Biomedical Engineering, Pukyong National University, Busan 608737 (Korea, Republic of)

    2015-09-01

    Precursor of Europium doped calcium aluminate (CaAl{sub 2}O{sub 4}: Eu) was prepared by the Pechini technique. The synthesized samples were calcined at 900–1500 °C for 2 h in air atmosphere. The crystal structures of calcined samples at low and high temperatures were found to be the metastable hexagonal and stable monoclinic systems by X-ray powder diffraction (XRD) analysis, respectively. The effects of Eu content and valence state on the luminescence characteristics of CaAl{sub 2}O{sub 4}: Eu were studied by luminescence spectrometer (LS). With the increase in calcination temperature, the phosphors exhibited color change from bright red to violet upon excitation by UV-light and an abnormal reduction of Eu{sup 3+}→Eu{sup 2+} was observed in monoclinic phase of CaAl{sub 2}O{sub 4}: Eu that calcined in air atmosphere at high temperature. The reduction mechanism was explained reasonably by a rigid three-dimensional framework structure of the stable monoclinic phase of CaAl{sub 2}O{sub 4}: Eu and a charge compensation model.

  1. Ionic Conductivity and Air Stability of Al-Doped Li₇La₃Zr₂O₁₂ Sintered in Alumina and Pt Crucibles.

    Science.gov (United States)

    Xia, Wenhao; Xu, Biyi; Duan, Huanan; Guo, Yiping; Kang, Hongmei; Li, Hua; Liu, Hezhou

    2016-03-01

    Li7La3Zr2O12 (LLZO) is a promising electrolyte material for all-solid-state battery due to its high ionic conductivity and good stability with metallic lithium. In this article, we studied the effect of crucibles on the ionic conductivity and air stability by synthesizing 0.25Al doped LLZO pellets in Pt crucibles and alumina crucibles, respectively. The results show that the composition and microstructure of the pellets play important roles influencing the ionic conductivity, relative density, and air stability. Specifically, the 0.25Al-LLZO pellets sintered in Pt crucibles exhibit a high relative density (∼96%) and high ionic conductivity (4.48 × 10(-4) S cm(-1)). The ionic conductivity maintains 3.6 × 10(-4) S cm(-1) after 3-month air exposure. In contrast, the ionic conductivity of the pellets from alumina crucibles is about 1.81 × 10(-4) S cm(-1) and drops to 2.39 × 10(-5) S cm(-1) 3 months later. The large grains and the reduced grain boundaries in the pellets sintered in Pt crucibles are favorable to obtain high ionic conductivity and good air stability. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy results suggest that the formation of Li2CO3 on the pellet surface is probably another main reason, which is also closely related to the relative density and the amount of grain boundary within the pellets. This work stresses the importance of synthesis parameters, crucibles included, to obtain the LLZO electrolyte with high ionic conductivity and good air stability.

  2. Inhibiting effect of Al(OH)3 and Mg(OH)2 dust on the explosions of methane-air mixtures in closed vessel

    Institute of Scientific and Technical Information of China (English)

    WANG QiuHong; WEN Hu; WANG QingSong; SUN JinHua

    2012-01-01

    The inhibiting effect of Al(OH)3 and Mg(OH)2 dust on explosion of methane-air mixtures was investigated by means of explosion parameter tests in a 20-liter closed vessel.The influences of varying methane concentration and dust concentration on explosion parameters were characterized based on the experimental data to determine the maximum explosion pressure,maximum rate of pressure rise,lower explosion limits and upper explosion limits.The inhibiting mechanisms of these kinds of dust were analyzed as well.The investigations indicate that Al(OH)3 and Mg(OH)2dust can be used as inhibitors to prevent methane explosion,however,their inhibiting effects are less than those of inert gas such as N2 and CO2 in that their dust can weaken the methane explosion but cannot totally eliminate it.The tests show that all of the explosion parameters with dust additives are strongly dependent on methane/air ratio and dust concentration,and Al(OH)3 dust has better performance than Mg(OH)2 dust in inhibiting methane explosion.The average percentage decreases of maximum explosion pressure and maximum rate of pressure rise with Al(OH)3 dust are 11.08% and 66.15%,respectively.Experiments also showed that there is a special phenomenon when methane explosion is inhibited by Al(OH)3 and Mg(OH)2 dust,in which is that during the process of explosion the maximum explosion pressure value first decreases then increases as dust concentration increases.The best dust concentrations to inhibit the explosion are 250 g/m3 with methane/air ratio at 9.5%,and 200 g/m3 with methane/air ratio at 7%.It is suggested that water vapor produced by the thermal decomposition of metal hydroxides makes the particles of descending dust combine,resulting in a decrease of the real dust concentration in the vessel.Water vapor also is the major cause of another phenomenon that the LEL curve and the UEL curve never meet with the increase of gas concentration.

  3. La educación puesta a prueba en un espacio de reclusión

    Directory of Open Access Journals (Sweden)

    Gilles Chantraine

    2013-04-01

    Full Text Available Recién llegados al paisaje carcelario francés, los establecimientos penitenciarios para menores (EPM son fruto de la voluntad de convertir los espacios de reclusión destinados a jóvenes de entre 13 y 18 años en espacios propiamente “educativos”, al objeto de dar respuesta a la falta de continuidad socioeducativa de los menores presos de los quartiers mineurs ubicados en las prisiones de adultos. Basada en una investigación monográfica realizada en dos EPM que mezcla observaciones directas de la vida cotidiana de la reclusión con entrevistas semiestructuradas hechas al conjunto de actores del EPM.Esta contribución está basada en una investigación monográfica hecha en dos EPM, que mezcla observaciones directas de la vida cotidiana de la reclusión con entrevistas semidirectivas realizadas al conjunto de actores del EPM; su objetivo es analizar la forma adoptada por las prácticas educativas en estos establecimientos y su entrelazamiento con el orden penitenciario. Una vez recordados algunos elementos de contexto relativos a las recientes transformaciones de la justicia de menores en Francia, propondremos una mirada simétrica de las prácticas de los educadores de la PJJ (Protección Judicial de la Juventud y de los vigilantes penitenciarios.Este análisis simétrico nos llevará a demostrar que, aun poniendo de manifiesto una apertura relativa de la institución carcelaria, el EPM sigue marcado por una supremacía de las lógicas securitarias sobre las lógicas educativas, que dibuja una articulación original entre ambas lógicas: en el EPM ya no se trata únicamente de constreñir los cuerpos de los presos a someterse al orden penitenciario, sino también de una labor de movilización de las subjetividades reclusas mediante un trabajo “educativo” de persuasión sobre la pertinencia del orden penitenciario.

  4. La fotografía de moda y la puesta en escena a través de la obra de Deborah Turbeville

    Directory of Open Access Journals (Sweden)

    Beatriz Guerrero González-Valerio

    2015-01-01

    Full Text Available La relación entre moda y fotografía ha sido desde siempre muy estrecha y fructífera. Dado que la moda es un producto comercial, debe ser presentada al público, tiene que comunicarse y venderse. En este sentido, las fotogra-fías de moda son muy efectivas porque establecen una comunicación inmediata con el espectador. Sin embargo, el fotógrafo de moda no sólo crea imágenes bellas para vender. A través de sus relatos, el fotógrafo sugiere y hace soñar, propone para hacer sentir y para transmitir una sensación. A la hora de crear un determinado ambiente, la fotografía de moda entra en relación y bebe de otras artes, como la pintura, la arquitectura, el teatro o el cine. Éste es el caso de la fotógrafa que nos ocupa, Deborah Turbeville. Partiendo de este contexto, el presente artículo estudiará y analizará la fotografía de moda realizada por Deborah Turbeville, recientemente fallecida a los ochenta y un años de edad. A lo largo de su dilatada carrera, la mencionada fotógrafa fue capaz de crear su propia visión, a través de unas puestas en escena llenas de poesía y misterio. El principal objetivo será tratar de establecer la concepción personal de la fotografía de moda en Deborah Turbeville y detectar, así mismo, cuáles son los elementos que subyacen en sus imágenes, además de la idea de elegancia y de belleza imperecedera. Se tratarán de establecer las analogías entre las imágenes de Deborah Turbeville y la fotografía pictorialista. La metodología se basa en la localización y recopilación de fuentes documentales. Dentro de las fuentes primarias, se estudian las obras publicadas hasta la fecha con las imágenes de Deborah Turbeville, especialmente la última publicación, Deborah Turbeville: The Fashion Pictures, Rizzoli, 2011. 

  5. Patrimonio rural: puesta en valor de los Paisajes Culturales a través del turismo

    OpenAIRE

    Romero, Mirta; Caamaño, María Gabriela; Orellano, Luis

    2011-01-01

    La provincia de San Juan está situada en el Centro-Oeste de Argentina. Sus áreas rurales presentan características comunes en relación al clima, recursos, actividad productiva, tradiciones y costumbres. En su gran mayoría son poseedoras de un valioso paisaje cultural. No obstante, su potencial se ve empañado por el estancamiento de su desarrollo económico y social, que pone en peligro la población y su cultura, produciendo la perdida de tradiciones y el deterioro del patrimonio co...

  6. Construcción y puesta en marcha de una impresora 3D modelo Rostock

    OpenAIRE

    Ponce Antolín, Miguel

    2014-01-01

    Proyecto dedicado a documentar la construcción de una máquina de prototipado rápido por deposición de material fundido o impresora 3D. El modelo construido, denominado como Rostock, es un ejemplo de máquina de cinemática paralela de bajo coste. Esta arquitectura permite alcanzar mayores aceleraciones y velocidades. Además, proporciona una mayor estabilidad al cabezal impresor y dobla la altura de impresión en comparación con las impresoras de bajo coste más difundidas. Este ...

  7. Ambientes virtuales como apoyo al Aprendizaje Colaborativo

    OpenAIRE

    Leguizamón, Guillermo; Chiarani, Marcela Cristina; Lucero, María Margarita; Pianucci, Irma Guadalupe; García, Berta Elena; Ponce, Viviana; Allendes Olave, Paola A.

    2005-01-01

    A partir de las conceptualizaciones sobre Educación a Distancia (EaD); y las Tecnologías disponibles para la EAD; se analizan los Ambientes Virtuales y su relación con el Código Abierto; lo que conlleva a presentar, en forma de grilla, las pautas y alcances de evaluación de plataformas virtuales de OS factibles de ser adaptados hacia la consecución de un Ambiente Virtual como apoyo al Aprendizaje Colaborativo. Con la puesta a punto, aplicación y relevo de esta grilla se estará en condicion...

  8. A new perspective on the Fukushima releases brought by newly available air concentration observations (Tsuruta et al, 2014) and reliable meteorological fields

    Science.gov (United States)

    Saunier, Olivier; Mathieu, Anne; Sekiyama, Thomas; Kajino, Mizuo; Adachi, Kouji; Bocquet, Marc; Igarashi, Yasuhito; Didier, Damien

    2016-04-01

    In case of nuclear power plant accident, the assessment of the temporal evolution in the amount of radionuclides released (source term) is required to evaluate human health and environment impacts. It is with in mind that IRSN has developed an operational tool based on inverse modeling techniques to evaluate the source term of a radioactive release. If the release amount is sufficiently strong as for the Fukushima accident, dose rate observations are primarily used to assess the source term (Saunier et al. 2013). Secondly, air concentrations measurements can also be used when available. For minor release events, air concentrations measurements are used. Five years after the Fukushima accident, many estimations of the source term based on the use of observations in the environment have been published. There is not yet consensus on the magnitudes on the releases rates, mainly due to the high uncertainties on meteorological fields used to assess the source term. Within the framework of cooperation between IRSN and Meteorological Research Institute (MRI) of Japan Meteorological Agency (JMA), meteorological fields with higher spatial resolution (3 km) have been used (Sekiyama et al. 2013) to improve the simulation of the atmospheric dispersion from the Fukushima accident. Besides, new dataset of Cs137 atmospheric concentration obtained from the sampling tapes of the Suspended Particle Matter (SPM) monitoring network by the method of Tsuruta et al. (2014) are available. These data are very useful since several plumes, unknown until now, could be identified in addition with the two major plumes on March 15 and March 21. Therefore, the inverse modeling method has been applied to assess a new source term using Tsuruta air concentration measurements, dose rate measurements and meteorological fields provided by MRI. The simulations performed using this new inverted source term help enhance our knowledge about the Fukushima accident. Several releases events are better

  9. Un método rápido y no-destructivo para medir la permeabilidad al aire del hormigón

    Directory of Open Access Journals (Sweden)

    Torrent, R. J.

    1999-06-01

    Full Text Available New device for non-destructive test. It is designed for "in situ" measurement of the impermeability to air of a concrete coating. The system is based on creating a vacuum inside a cell placed on its surface, and to measure how long does it take for the pressure to be back to the atmospheric value. The characteristic aspects of the method are: a cell with an inward chamber and a regulator to keep the pressure in balance inside this central chamber (measurement and in the surrounding chamber (preservation ring. This ensures a single air flow direction towards the central chamber, avoiding any spurious transversal flow. The data of the measurement are processed by a microprocessor that indicates the permeability coefficient value at the end of the test which lasts 2 to 12 minutes. Results on coatings of different quality obtained through this technique are presented, which show an excellent correlation with values obtained on specimens using Cembureau method for permeability to oxigen imperviousness.

    Se presenta un nuevo dispositivo de ensayo no destructivo, diseñado para la medición "in situ " de la permeabilidad al aire del recubrimiento de hormigón. Se basa en crear vacío dentro de una celda colocada sobre la superficie del mismo y en medir la velocidad con que la presión retorna al valor atmosférico. Aspectos característicos del método son: una celda con doble cámara y un regulador que equilibra la presión en la cámara central (de medicióny en la cámara exterior (anillo de guarda. Esto asegura un flujo unidireccional de aire hacia la cámara central, eliminando todo flujo espúreo transversal. Los datos de la medición son procesados por un microprocesador que indica el valor del coeficiente de permeabilidad al finalizar el ensayo, que dura de 2 a 12 minutos. Se presentan resultados obtenidos con esta técnica sobre recubrimientos de distinta calidad, que muestran una excelente correlación con los valores obtenidos

  10. Puesta en turismo y perennidad turística de los lugares: contexto, procesos e invariables

    Directory of Open Access Journals (Sweden)

    Philippe Duhamel

    2007-11-01

    Full Text Available Este artículo tiene por objeto entender cómo los lugares se vuelven turísticos y tambiéncómo permanecen. Para eso, este texto es el resultado de un trabajo colectivo y da cuenta de las principales motivaciones que permiten explicar situaciones turísticas variadas en el tiempo y en el espacio. Se tomaron tres elementos para ello: los protagonistas, las prácticas y los lugares. De cierto modo, en una primera etapa hacia una comprensión general del fenómeno turístico, preludio a su teorización. Al mismo tiempo da cuenta del estado de progreso de nuestra reflexión desde hace diez años y desdeeste punto de vista debe tomarse como un resultado temporal.

  11. Factores predictivos de la no adherencia al tratamiento de la tuberculosis en municipios del Área Metropolitana de Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Silvina Arrossi

    2012-01-01

    Full Text Available El objetivo de este estudio fue identificar las características sociodemográficas de los pacientes y las características del tratamiento que influyen en la no-adherencia al tratamiento antituberculoso. Se realizó un estudio de corte transversal, en el Área Metropolitana de Buenos Aires. Se encuestaron 38 pacientes que no adhirieron al tratamiento y 85 pacientes que adhirieron al tratamiento, diagnosticados durante el año 2007, residentes y atendidos en hospitales de municipios seleccionados. El análisis de los factores se llevó a cabo mediante regresión logística. Los resultados indican que los pacientes con viviendas sin agua, tuvieron 3 veces más probabilidad de no adherencia (OR=2,8; IC95% 1,1-6,9. Asimismo, los pacientes que realizaban los controles en un hospital tuvieron 3 veces más riesgo de no adherir que los que los realizaban en centros de atención primaria (OR=3,2; IC95% 1,1-8,9. Estos resultados permiten delinear un perfil de paciente en riesgo de no-adherencia, caracterizado por estar en condiciones de pobreza, y con dificultades de acceso a la atención de su salud.

  12. La configuración histórica del Gran Buenos Aires: transformaciones y debates en torno al objeto

    Directory of Open Access Journals (Sweden)

    Ana Helena Gómez Pintus

    2015-05-01

    Full Text Available This paper reveals an unfamiliar side of the expansion of the Greater Buenos Aires (GBA: the creation of residential areas that fall into the category of ”garden city“ suburbs, during the urban sprawl years (1887- 1970. At the same time, it carries out a reflection on the spatial transformation of the area, as well as on the names used to refer to it. We assume that there is a problematical relationship between the word, the object, and its application to different realities.

  13. La transferencia de políticas globales de género y su puesta en agenda

    Directory of Open Access Journals (Sweden)

    Paula Ruíz

    2015-06-01

    Full Text Available Desde la década de los ochenta, el género se incorpora como categoría analítica e  interpretativa que ha venido evolucionado tanto en su desarrollo teórico y metodológico como político y social. En el ámbito académico, por ejemplo, su análisis se ha abordado como una construcción cultural y social, lo cual ha permitido ampliar su espacio de discusión y de estudio como método de investigación dentro de las ciencias sociales. El feminismo, como movimiento social, ha impactado en la construcción de políticas en pro del empoderamiento de la mujer, impulsando a los Estados a suscribir acuerdos que paulatinamente, en la mayoría de sociedades, han mejorado su situación en los distintos ámbitos. La movilización internacional sobre temas blandos de la agenda internacional ha llevado a la transferencia de políticas de un sistema a otro y a su puesta en agenda a nivel local. En este artículo se estudiarán los aportes que el feminismo ha desarrollado en materia de investigación dentro de las relaciones internacionales, así como la influencia que el género ha tenido para la formulación de políticas globales y la implementación de estas a nivel local.

  14. High-temperature oxidation behaviour of Ti3Si(1–)AlC2 in air

    Indian Academy of Sciences (India)

    Liu Xiaopan; Wan Long; Bu Zhongheng; Nie Daojun

    2009-10-01

    The oxidation behaviours of bulk Ti3Si(1–)AlC2 prepared by hot pressing were investigated. The results showed that the isothermal oxidation behaviour of Ti3SiC2 obeyed a parabolic law between 900 and 1100°C, and followed a two-step parabolic rate law between 1200°C and 1300°C. The cyclic oxidation behaviour of material is assumed to obey a three-step parabolic rate law at 1100°C and 1200°C. The calculated activation energy of isothermal oxidation is 101.43 kJ.mol-1. The oxide layers consisted of a mass of -Al2O3 and little TiO2 and SiO2 are observed on Ti3SiC2 as a dense and adhesive protect scale. The oxidation mechanism varies with the additive aluminum that greatly improves the oxidation resistance of Ti3SiC2.

  15. Air-stable short-wave infrared PbS colloidal quantum dot photoconductors passivated with Al{sub 2}O{sub 3} atomic layer deposition

    Energy Technology Data Exchange (ETDEWEB)

    Hu, Chen [Photonics Research Group-INTEC, Ghent University-imec, Sint-Pietersnieuwstraat 41, 9000 Ghent (Belgium); Center for Nano-and Biophotonics, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent (Belgium); Physics and Chemistry of Nanostructures Group, Ghent University, Krijgslaan 281-S3, B-9000 Ghent (Belgium); Gassenq, Alban; Chen, Hongtao; Roelkens, Günther, E-mail: gunther.roelkens@intec.UGent.be [Photonics Research Group-INTEC, Ghent University-imec, Sint-Pietersnieuwstraat 41, 9000 Ghent (Belgium); Center for Nano-and Biophotonics, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent (Belgium); Justo, Yolanda; Hens, Zeger [Center for Nano-and Biophotonics, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Ghent (Belgium); Physics and Chemistry of Nanostructures Group, Ghent University, Krijgslaan 281-S3, B-9000 Ghent (Belgium); Devloo-Casier, Kilian; Detavernier, Christophe [Department of Solid State Sciences, Universiteit Gent, Krijgslaan 281-S1, 9000 Ghent (Belgium)

    2014-10-27

    A PbS colloidal quantum dot photoconductor with Al{sub 2}O{sub 3} atomic layer deposition (ALD) passivation for air-stable operation is presented. Two different types of inorganic ligands for the quantum dots, S{sup 2−} and OH{sup −}, are investigated. PbS/S{sup 2−} photoconductors with a cut-off wavelength up to 2.4 μm are obtained, and a responsivity up to 50 A/W at 1550 nm is reported. The corresponding specific detectivity is ∼3.4 × 10{sup 8} Jones at 230 K. The 3-dB bandwidth of the PbS/S{sup 2−} and PbS/OH{sup −} photodetectors is 40 Hz and 11 Hz, respectively.

  16. Método de Cuckow para la calibración de aerómetros : diseño y puesta a punto del equipo

    Directory of Open Access Journals (Sweden)

    Joselaine Cáceres

    2011-05-01

    Full Text Available El método utilizado en el Laboratorio Tecnológico del Uruguay (LATU para calibración de aerómetros es el “Método de Cuckow para calibración de aerómetros utilizando agua adicionada con un tensoactivo como fluido patrón”. En este método se usa un tensoactivo para bajar la tensión superficial del agua destilada utilizada como fluido patrón y se verifica que la variación en la densidad de la misma, producto del agregado del tensoactivo, contribuye en forma despreciable a la incertidumbre del método y puede ser contemplada dentro de la incertidumbre aceptada para la densidad del agua destilada. Se planificó una estrategia para bajar la incertidumbre de calibración del método; para ello se diseñó un recipiente con un sistema de termostatización con recirculación de agua por camisa, lo que aporta estabilidad térmica al sistema. Se utilizóagitación mecánica para favorecer la termostatización y evitar gradientes de densidad asociados a inhomogeneidad en la temperatura. También se realizaron mejoras en el sistema de ajuste de la lectura y formación del menisco. Luego de estas mejoras se validó nuevamente el método y se demostró que se alcanza la meta propuesta de disminuir las incertidumbres de calibración, estando en condiciones de aplicarlo a calibración de aerómetros de precisión. En el presente artículo se detallan las consideraciones realizadas en el diseño y puesta a punto del equipo mejorado, fundamentalmente el recipiente y el sistema de termostatización. Se plantea la construcción del recipiente a partir de tubos de vidriodisponibles en el mercado, bajando así sus costos.AbstracThe method used in Laboratorio Tecnológico del Uruguay (LATU for hydrometers calibration is the “Cuckow method for hydrometers calibration using water added with a surfactant as a standard”. A surfactant is used to decrease the surface tension of distilated water used as a standar and is verified that the density variation

  17. Assembly of octadecyl phosphonic acid on the α-Al2O3 (0 0 0 1) surface of air annealed alumina: Evidence for termination dependent adsorption

    International Nuclear Information System (INIS)

    Self-assembly of octadecyl phosphonic acid (ODPA) from solution to the (0 0 0 1) plane surface of single crystal alumina is studied using atomic force microscopy (AFM), wettability measurements, transmission infrared spectroscopy and X-ray photoelectron spectroscopy (XPS). The crystals were annealed in air at 1300 deg. C to produce a surface with terraces of 0.2 nm height. This resulted in a surface comprising a mixture of terraces terminated by either oxygen or aluminium atoms. After exposure of this surface to a solution of ODPA, the XPS C1s core level reveals partial displacement of adventitious carbonaceous material by the ODPA. The phase contrast image from tapping mode AFM acquired during assembly reveals that the surface chemistries of terraces differ significantly, suggesting along with the topography images that ODPA molecules adsorbed preferentially to certain terraces. We suggest that the ODPA adsorbs preferentially to the aluminium terminated terraces that are hydroxylated in air. The adsorption to only Al-terminated terraces at the micron scale is consistent with the apparent low coverage of ODPA estimated using techniques sampling the surface on a millimetre scale including XPS and wettability measurements. This behaviour is compared to ODPA close-packed monolayer coverages formed on the amorphous oxide/hydroxide surface of aluminium metal.

  18. Proyecto de diseño, ejecución y puesta en marcha de una explotación de cebo en Los Rábanos (Soria)

    OpenAIRE

    Duce Plaza, José María

    2013-01-01

    TRABAJO RECOMENDADO POR EL CENTRO El proyecto consiste en el diseño de una explotación de cerdos de cebo en el municipio soriano de Los Rábanos y su evaluación económica, para una posterior ejecución y puesta en marcha. Después de comprobar que la parcela donde se pretende ubicar la explotación, cumple todos los requisitos legales, tanto urbanísticos como ambientales, y dispone de agua y luz eléctrica, se proyecta la construcción de una nave cebadero de lechones modular, de ...

  19. Efecto de la estirpe y del tratamiento de muda en la interrupción de la puesta y la recuperación productiva posterior

    OpenAIRE

    Callejo Ramos, Antonio; Nicodemus Martin, Nuria; Lainez Castro, Kristel Sofía; Buxade Carbo, Carlos

    2012-01-01

    La inducción de la muda en gallinas ponedoras, mediante la supresión total del alimento sólido, está prohibida en la UE. Por ello, es necesario estudiar sistemas alternativos que, logrando los mismos efectos, no causen en el ave una sensación de hambre que perjudique significativamente su bienestar. El objetivo es conseguir que la gallina experimente una adecuada pérdida de peso vivo para que la puesta cese rápidamente, su tracto reproductor se "rejuvenezca", restableciéndose l...

  20. Thermal Shock Behavior of Air Plasma Sprayed CoNiCrAlY/YSZ Thermal Barrier Coatings

    Science.gov (United States)

    Liu, Zi Wei; Wu, Wei; Hua, Jia Jie; Lin, Chu Cheng; Zheng, Xue Bin; Zeng, Yi

    2014-07-01

    The structural changes and failure mechanism of thermal barrier coatings (TBCs) during thermal shock cycling were investigated. TBCs consisting of CoNiCrAlY bond coat and partially yttria-stabilized zirconia (YSZ) top coat were deposited by atmospheric plasma spraying (APS) on a nickel-based alloy substrate and its thermal shock resistance performance was evaluated. TBCs were heated at 1100°C for 15 min followed by cold water quenching to ambient temperature. Microstructural evaluation and elemental analysis of TBCs were performed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. The crack features of YSZ coatings in TBCs during thermal shock cycling, including those of horizontal (parallel to the substrate) and vertical cracks (perpendicular to the substrate), were particularly investigated by means of SEM and image analysis. Results show that horizontal and vertical cracks have different influences on the thermal shock resistance of the coatings. Horizontal cracks that occur at the interface of YSZ and thermally growth oxidation (TGO) cause partial or large-area spalling of coatings. When vertical and horizontal cracks encounter, network segments are formed which lead to partial spalling of the coatings.

  1. Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application

    Science.gov (United States)

    Kumar, Dipak; Pandey, K. N.; Das, Dipak Kumar

    2016-08-01

    In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying (APS) techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and atomic force microscopy (AFM) were used to investigate the phases and microstructure of the as-sprayed, APS-deposited CoNiCrAlY bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. Confirmation of nanoscale grains of the γ/γ'-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in CoNiCrAlY bond-coatings with excellent thermal cyclic resistance suitable for use in high-temperature applications. Cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate.

  2. AL:PE - Acidification of Mountain Lakes: Palaeolimnology and Ecology. Part 2 - Remote Mountain Lakes as Indicators of Air Pollution and Climate Change

    Energy Technology Data Exchange (ETDEWEB)

    Wathne, Bente M.; Patrick, Simon; Cameron, Nigel [eds.

    1997-07-01

    AL:PE is a multi-disciplinary and multi-national project coordinated by research groups in London and Oslo. It is funded by the European Commission, The project is described in this report. The project is the first comprehensive study of remote mountain lakes on a European scale. It is concerned with ecosystems in the arctic and alpine regions of Europe that are threatened by acid deposition, toxic air pollutants and climatic change despite their remoteness. The studies are important not only for ecosystems of the lakes, for which they were designed, but for the arctic and alpine regions in general, since the lakes with their sediment records act as environmental sensors. The AL:PE results illustrate two overarching issues: (1) the importance of these remote and sensitive ecosystems as sensors of long-range transported pollutants and as providers of early warning signals for more widespread environmental change; and (2) the importance and urgency of understanding the present and future impact of pollutants, both singly and in combination, on aquatic ecosystems. Currently, acid deposition is considered the most potent threat. In the context of global warming, however, it is a formidable scientific challenge to disentangle the interactions between the effects of changing deposition patterns of acids, nutrients, trace metals and trace organics. The AL:PE programme has begun to address this challenge and its successor EU project, MOLAR, is designed to tackle the issues more more specifically by focusing on in-depth studies of key sites. 97 refs., 192 figs., 100 tabs.

  3. Water velocity at water-air interface is not zero: Comment on "Three-dimensional quantification of soil hydraulic properties using X-ray computed tomography and image-based modeling" by Saoirse R. Tracy et al.

    Science.gov (United States)

    Zhang, X. X.; Fan, X. Y.; Li, Z. Y.

    2016-07-01

    Tracy et al. (2015, doi: 10.1002/2014WR016020) assumed in their recent paper that water velocity at the water-air interface is zero in their pore-scale simulations of water flow in 3-D soil images acquired using X-ray computed tomography. We comment that such a treatment is physically wrong, and explain that it is the water-velocity gradient in the direction normal to the water-air interface, rather than the water velocity, that should be assumed to be zero at the water-air interface if one needs to decouple the water flow and the air flow. We analyze the potential errors caused by incorrectly taking water velocity at the water-air interface zero based on two simple examples, and conclude that it is not physically sound to make such a presumption because its associated errors are unpredictable.

  4. Discursos e intervenciones en torno al espacio público. Experiencias en Viena y Buenos Aires a principios de siglo XXI.

    Directory of Open Access Journals (Sweden)

    Eva Schwab

    2014-12-01

    Full Text Available En esta contribución indagamos en torno a políticas públicas para el espacio público que se desarrollan en el seno de los gobiernos de Viena y Buenos Aires. Específicamente, pretendemos: a describir los discursos vigentes sobre el espacio público, focalizándonos en relación a la noción de integración, y b analizar diversas intervenciones estatales en el espacio público orientadas -al menos explícitamente- a generar ciudades más inclusivas e integradas. A partir de un análisis sustentado fundamentalmente en fuentes secundarias, entendemos que a pesar de discursos en apariencia similares, se debería considerar que Viena y Buenos Aires inscriben su historia y devenir en contextos territoriales disímiles. Sin embargo, el proceso de globalización implica -entre otras cuestiones- una homogenización de los discursos a la vez que una relativa subestimación de los condicionantes locales. Estimar los mismos resulta indispensable para entender las implicaciones de esos discursos en la implementación de políticas públicas con efecto directo en el espacio público y sus usos. Una evaluación de las diferencias de las condiciones locales enriquece el análisis en torno a las intervenciones en el espacio público por parte de los gobiernos de ambas ciudades, permitiéndonos comprender la ambigüedad de las nociones y el riesgo de pérdida/cuestionamiento de derechos que implica esa ambigüedad -especialmente para los sectores sociales más vulnerables de la sociedad-.

  5. High-k Al2O3 MOS structures with Si interface control layer formed on air-exposed GaAs and InGaAs wafers

    International Nuclear Information System (INIS)

    This paper attempts to realize unpinned high-k insulator-semiconductor interfaces on air-exposed GaAs and In0.53Ga0.47As by using the Si interface control layer (Si ICL). Al2O3 was deposited by ex situ atomic layer deposition (ALD) as the high-k insulator. By applying an optimal chemical treatment using HF acid combined with subsequent thermal cleaning below 500 deg. C in UHV, interface bonding configurations similar to those by in situ UHV process were achieved both for GaAs and InGaAs after MBE growth of the Si ICL with no trace of residual native oxide components. As compared with the MIS structures without Si ICL, insertion of Si ICL improved the electrical interface quality, a great deal both for GaAs and InGaAs, reducing frequency dispersion of capacitance, hysteresis effects and interface state density (Dit). A minimum value of Dit of 2 x 1011 eV-1 cm-2 was achieved both for GaAs and InGaAs. However, the range of bias-induced surface potential excursion within the band gap was different, making formation of electron layer by surface inversion possible in InGaAs, but not possible in GaAs. The difference was explained by the disorder induced gap state (DIGS) model.

  6. Cuando la alegría entra al centro de salud: una experiencia de promoción de salud en Buenos Aires, Argentína

    Directory of Open Access Journals (Sweden)

    Claudia Bang

    2016-06-01

    Full Text Available Como parte de una investigación posdoctoral, el presente trabajo describe y analiza una experiencia de promoción y educación para la salud integral desarrollada por un Centro de Salud y Acción Comunitaria en una zona marginal urbana del sur de la Ciudad de Buenos Aires. Se trata de un estudio exploratorio-descriptivo que utiliza técnicas cualitativas para el trabajo de campo y análisis del material. En articulación con las dimensiones de la APS integral, se describe y analiza un dispositivo vincular, centrado en la interdisciplina y la articulación intersectorial como elementos clave de la organización de los cuidados en salud, con la inclusión de la dimensión intercultural y la participación comunitaria. Se incorporan actividades de promoción de salud integral centradas en el arte, creatividad y juego, constituyéndose en una experiencia resistencial al modelo biomédico de atención, con fuerte impacto subjetivo en los profesionales y la comunidad participante.

  7. El Comité Católico de Propaganda Francesa en España durante la Gran Guerra. Una puesta al día

    Directory of Open Access Journals (Sweden)

    Casas Rabasa, Santiago

    2013-06-01

    Full Text Available Spain remained neutral during the Second World War, but its territory became the battleground for the propaganda of the different warring countries. One French response to the German propaganda in Spain (and, by extension, other neutral countries consisted in the creation of the French Catholic Committee of Propaganda. This Committee was characterized by its employment of traditional Spanish Catholicism as a vehicle for nationalistic propaganda. The collaboration between some ecclesiastics and the French government in favour of France was the work of Alfred Baudrillart, rector of the Catholic Institute of Paris. Baudrillart made two propaganda trips to Spain, meeting with political, intellectual and ecclesiastical personalities, and initiating diverse propaganda initiatives.Durante la Primera Guerra Mundial España permaneció neutral. No obstante, su territorio fue campo de batalla de las diferentes propagandas de los países en conflicto. Una respuesta francesa a la propaganda alemana en España y, por extensión, en los demás países neutrales, fue la creación del Comité Católico de Propaganda Francesa. Este Comité tuvo la característica de utilizar la tradicional catolicidad española para vehicular una propaganda de tipo nacionalista. Esta colaboración entre algunos eclesiásticos y el gobierno francés en pro de Francia fue obra de Alfred Baudrillart, rector del Instituto Católico de Paris. Baudrillart realizó dos viajes de propaganda a España donde se entrevistó con personalidades políticas, intelectuales y eclesiásticas, poniendo en marcha diversas iniciativas propagandísticas.

  8. Una pequeña puesta al día sobre la tricotilomanía[A brief update on trichotillomania

    Directory of Open Access Journals (Sweden)

    Julio Torales

    2016-10-01

    Full Text Available Trichotillomania is a chronic disorder characterized by the fact of tearing the hair by oneself, resulting in considerable loss of it. This disorder appears to be a relatively common in pediatric population. Its ocurrence is associated with significant morbidity, comorbidity and functional impairment in adults, surprisingly few studies investigating the psychopathology of trichotillomania actually they included teenagers or children. Recent reviews have shown the efficacy of cognitive-behavioral pediatric trichotillomania, therapy but have also noted problems with relapse; these same reviews have mentioned the general lack of benefit associated with treatment only with selective inhibitors of serotonin reuptake. Recent developments in pharmacotherapy has been suggested that other medicines (atypical antipsychotics, opioid blockers and modulators glutamate are promising as treatments for trichotillomania, both children and adults. This article has the overall objective to conduct a general review of the prevailing trends in pediatric trichotillomania, emphasizing the evaluation of pathology and the most current treatment recommendations.

  9. Osteonecrosis de los maxilares por bisfosfonatos: Actualización y puesta al día Bisphosphonate-related osteonecrosis of the jaws: An update

    Directory of Open Access Journals (Sweden)

    F. Cardona

    2009-12-01

    Full Text Available Los bisfosfonatos son unos fármacos ampliamente utilizados principalmente para la osteoporosis y también en oncología. Un efecto secundario o complicación de los mismos, desconocida hasta el año 2003, es la osteonecrosis de los maxilares. Se revisan, en este trabajo, las características químicas de los distintos bisfosfonatos, su posible mecanismo de acción, la potencia relativa, los productos comerciales existentes en el mercado farmacéutico español y sus indicaciones; igualmente se repasa la osteonecrosis de los maxilares en sus comienzos, su concepto, sus estadios clínicos, la razón por la que esta patología aparece en los maxilares, sus factores de riesgo, su incidencia, la actitud a tomar por los dentistas con los pacientes que toman bisfosfonatos, el tratamiento y la posible predicción de la osteonecrosis.Bisphosphonates are widely used drugs, primarily for osteoporosis and also in oncology. A drug-induced side effect or complication, which only recently came to light in 2003, is osteonecrosis of the jaw. This study reviews the chemical characteristics of the various bisphosphonates, their possible mechanism of action, relative potency, the commercial products available on the spanish pharmaceutical market and the indications for bisphosphonate treatment. The study also considers osteonecrosis of the jaw with regard to its onset, concept, clinical stages, why this pathology affects the jaws, its risk factors, incidence, the attitude to be adopted by dentists with patients taking bisphosphonates, a quick review of the treatment and the possible prediction of osteonecrosis.

  10. Cuidados de enfermería en las úlceras del pie diabético. Reunión y puesta al día

    OpenAIRE

    Rincón Martín, Marina

    2016-01-01

    Entre las numerosas repercusiones de la diabetes mellitus a nivel sistémico, se pueden señalar la neuropatía, la angiopatía periférica y el aumento de la susceptibilidad para sufrir infecciones como las principales causas de la aparición de úlceras del denominado “pie diabético”, cuya incidencia en estos pacientes se estima alrededor del 15%. Debido a la magnitud de este problema, a su relación con un mayor riesgo para sufrir amputaciones, y a que en los últimos años ha aumentado el número...

  11. Diseño y puesta en marcha de una célula de fabricación flexible robotizada (II)

    OpenAIRE

    Olmo Acebes, Daniel del

    2009-01-01

    Este Proyecto Fin de Carrera se basa en el diseño y puesta en marcha de una célula de fabricación flexible robotizada, que realice distintos procesos de ensamblaje y mecanizado del sector de la construcción. Dicha célula, es una reproducción de una factoría móvil llamada Mobile Factory, incluida dentro de uno de los proyectos de colaboración europeos del Sexto Programa Marco de la Comisión Europea (6FP) llamado ManuBuild, el cual se explica detalladamente más adelante. La idea principal y a s...

  12. Diseño y puesta en marcha de una célula de fabricación flexible robotizada (I)

    OpenAIRE

    Álvarez Paramio, José

    2009-01-01

    Este Proyecto Fin de Carrera se basa en el diseño y puesta en marcha de una célula de fabricación flexible robotizada, que realice distintos procesos de ensamblaje y mecanizado del sector de la construcción. Dicha célula, es una reproducción de una factoría móvil llamada Mobile Factory, incluida dentro de uno de los proyectos de colaboración europeos del Sexto Programa Marco de la Comisión Europea (6FP) llamado ManuBuild, el cual se explica detalladamente más adelante. La idea principal y obj...

  13. FACTORES DE ÉXITO DEL PROCESO DE PUESTA EN MARCHA DE LA EMPRESA: VALORES CULTURALES, REDES SOCIALES Y AYUDAS PÚBLICAS

    Directory of Open Access Journals (Sweden)

    Valencia de Lara. P.

    2009-01-01

    Full Text Available En este trabajo analizamos el efecto de los valores culturales, las redes sociales y los programas de apoyo de organismos públicos en la puesta en marcha de proyectos empresariales. Los resultados muestran que los individuos con valores culturales de seguridad y universalismo –mixtostienden a finalizar con éxito la creación de su empresa. Por el contrario, determinados valores colectivistas, como la benevolencia, la conformidad o la tradición, inciden negativamente en el nacimiento de la empresa. También comprobamos que son las redes que aportan conocimientos directivos y los programas de ayuda pública no financiera provenientes de la Ventanilla Única Empresarial (en adelante VUE los que más favorecen la creación de la empresa.

  14. Methodology for evaluating the grounding system in electrical substations; Metodologia para la evaluacion del sistema de puesta a tierra en subestaciones electricas

    Energy Technology Data Exchange (ETDEWEB)

    Torrelles Rivas, L.F [Universidad Nacional Experimental Politecnica: Antonio Jose de Sucre (UNEXPO), Guayana, Bolivar (Venezuela)]. E-mail: torrellesluis@gmail.com; Alvarez, P. [Petroleos de Venezuela S.A (PDVSA), Maturin, Monagas (Venezuela)]. E-mail: alvarezph@pdvsa.com

    2013-03-15

    The present work proposes a methodology for evaluating grounding systems in electrical substations from medium and high voltage, in order to diagnose the state of the elements of the grounding system and the corresponding electrical variables. The assessment methodology developed includes a visual inspection phase to the elements of the substation. Then, by performing measurements and data analysis, the electrical continuity between the components of the substation and the mesh ground is verified, the soil resistivity and resistance of the mesh. Also included in the methodology the calculation of the step and touch voltage of the substation, based on the criteria of the International IEEE standards. We study the case of the 115 kV Pirital Substation belonging to PDVSA Oriente Transmission Network. [Spanish] En el presente trabajo se plantea una metodologia para la evaluacion de sistemas de puesta a tierra en subestaciones electricas de media y alta tension, con la finalidad de diagnosticar el estado de los elementos que conforman dicho sistema y las variables electricas correspondientes. La metodologia de evaluacion desarrollada incluye una fase de inspeccion visual de los elementos que conforman la subestacion. Luego, mediante la ejecucion de mediciones y analisis de datos, se verifica la continuidad electrica entre los componentes de la subestacion y la malla de puesta a tierra, la resistividad del suelo y resistencia de la malla. Se incluye tambien en la metodologia el calculo de las tensiones de paso y de toque de la subestacion, segun lo fundamentado en los criterios de los estandares Internacionales IEEE. Se estudia el caso de la Subestacion Pirital 115 kV perteneciente a la Red de Transmision de PDVSA Oriente.

  15. Evaluación del programa de educación ambiental formal “aula al aire libre”, Reserva Los Coyotes

    Directory of Open Access Journals (Sweden)

    Hernández Chaves, María Gabriela

    2013-05-01

    Full Text Available Resumen: El presente artículo muestra la evaluación realizada al programa “Aula al Aire Libre” de la Reserva Los Coyotes (Mata de Plátano, Goicoechea, en San José, Costa Rica, con el fin de presentarlo como una metodología innovadora y efectiva para la educación formal. Durante el 2010, se evaluó el nivel de conocimiento de los estudiantes participantes (n= 1085 antes y después del trabajo de campo utilizando pruebas cortas. El análisis de los resultados indicó que el momento de la prueba (antes/después tiene un efecto significativo en la nota obtenida; es decir, como consecuencia de su trabajo en Los Coyotes la cantidad de respuestas correctas aumentó de manera significativa. Para comparar la eficiencia de esta metodología con la del sistema tradicional de enseñanza, las evaluaciones post-visita fueron también administradas a un grupo control (n=498. Los resultados revelaron que los estudiantes participantes tienen un mejor manejo de los temas en cuestión que los estudiantes del grupo control. Además se aplicaron encuestas a los estudiantes y docentes de las escuelas participantes; tanto docentes como estudiantes mostraron altos niveles de satisfacción y consideraron el programa como una herramienta eficiente en la enseñanza de los contenidos formales. La encuesta además permitió identificar las fortalezas y debilidades del programa, dando así al personal de Los Coyotes información importante para reformular y mejorar la práctica. Abstract: This paper presents the evaluation of the program "Outdoor Classroom" of Reserva Los Coyotes (Mata de Plátano, Goicoechea, in San José, Costa Rica, in order to evince it as an innovative and effective methodology for formal education. During 2010, the level of knowledge of participating students (n = 1085 was assessed before and after the field work, using quiz-like instruments. The analysis of the results indicated that the moment of testing (before / after has a significant

  16. Tipo de parideras y productividad de las cerdas y sus camadas en un sistema de producción porcina al aire libre Farrowing type facilities and sow and litter productivity in an outdoor pig production system

    OpenAIRE

    Echevarría, A.; J Parsi; J Trolliet; P Rinaudo

    2005-01-01

    Se compararon tres tipos de parideras y dos épocas de parto de las cerdas en un establecimiento porcino al aire libre. Los tipos de parideras fueron: FA: Parideras de frente abierto de mampostería; AR: Parideras de campo tipo arco; UNRC: Parideras de campo mejoradas, diseño U.N.R.C. Las variables registradas fueron: Lechones nacidos vivos (NLeNV); Lechones destetados (NLeD); Peso promedio (Kg) de los lechones al destete (PLeD); Lechones muertos nacimiento - destete (NLeMN-D); Porcentaje de mo...

  17. Estructura de madera para la cubierta de un auditorio al aire libre en el parque El Paraíso, San Blas (Madrid

    Directory of Open Access Journals (Sweden)

    Caramés Gómez, Fernando

    2007-06-01

    Full Text Available This account of the design and construction of an outdoor auditorium in a park in Madrid begins with the study of the programme and choice of the shape and optimal materials for the roof. The solution adopted was to build with wood paraboloids in light of the large surface area that could be covered, the lightweight supports that could be used, the powerful and original image that would be projected and the short turnaround times and moderate cost that could be ensured.Wooden roof building began with the manufacture of a steel frame to support the ruling that sweeps the hyperbolic paraboloid. This frame was also to support removable self-bearing formwork that would constitute the fi rst row and have a load capacity able to support the entire weight of the roof in addition to acting as a guide for the rest of the structure. The next row was bolted and glued to this fi rst family of elements and each successive row was laid on the one before it.Double “omega” members made of circular section steel shapes, separated by an acutely angled opening, were designed as supports for the paraboloids. These elements brace the structure as a whole by allowing for the positioning of longitudinal reinforcements in the outermost supports.El artículo describe el proceso de diseño y de construcción de un auditorio al aire libre en un parque en Madrid. Comienza con el estudio del programa y la elección de la forma y los materiales óptimos de la cubierta. Se decidió la construcción de paraboloides de madera al tener la característica de poseer una gran superficie cubierta, permitir apoyos ligeros, crear una imagen poderosa y original, permitir unos plazos de ejecución pequeños y un coste moderado.La ejecución de las cubiertas de madera se inicia ediante la fabricación de un bastidor de acero obre el cual se apoya la generatriz que engendra el paraboloide hiperbólico. Este bastidor debe ervir a su vez de apoyo a una cimbra recuperable autoportante

  18. El Ejército del Aire en la estructura militar de la OTAN

    Directory of Open Access Journals (Sweden)

    Gómez Carretero, Fancisco José

    2002-02-01

    Full Text Available Not available

    La entrada de España en la estructura militar de la Alianza, la incorporación de nuevos miembros a ésta, los recientes acontecimientos del 11 de septiembre y la aplicación del Artículo V del Tratado en el conflicto de Afganistán, hacen que todo lo relacionado con esta Organización sea de plena actualidad.
    El artículo trata dicha Organización de forma general, para centrarse en las Fuerzas Aliadas en Europa Meridional (AFSOUTH, en especial en las Fuerzas Aéreas Aliadas del Sur (AIRSOUTH y sus relaciones con el Ejército del Aire. Se nos da una visión general de estas relaciones, profundizando en lo relativo al Centro Combinado de Operaciones Aéreas de Torrejón (CAOC 8, y en los ejercicios de Puestos de Mando (CPX o reales (LIVEX, en los que participa el Ejército del Aire.
    También trata sobre la puesta en práctica de los programas TACEVAL en los que estamos involucrados, así como en otros muchos temas, incluyendo incluso los docentes donde se constata el hecho de que en un futuro próximo muchas áreas de la enseñanza militar serán desarrolladas en colaboración con otros países de la Alianza.

  19. Selección, implantación y puesta en marcha de sensores de calidad de cultivo

    OpenAIRE

    Calvo Díaz, Irene

    2015-01-01

    Este proyecto se ubica en la cooperativa vitivinícola de Nuestra Señora de la Paz, Villarta de San Juan (Ciudad Real), y la extensión de la transformación es 48,4 ha, incluyendo cepas de la variedad Airén y de la variedad Cencibel. La finalidad del proyecto es ejecutar un plan de actuación basado en la oferta de diferentes tipos de servicios relacionados con la sensórica a dicha cooperativa, con el fin de reducir los costes de los insumos, mejorar la productividad y reducir la presión hidrólo...

  20. Creación y puesta en marcha de una empresa de servicios profesionales de ingeniería industrial

    OpenAIRE

    Veiga Gutiérrez, Luis

    2007-01-01

    Con este trabajo se pretende definir porqué y cómo se constituiría y se pondría en marcha una empresa dedicada a la prestación de servicios técnicos y profesionales relacionados con las posibilidades de la titulación de ingeniería industrial. La gama de servicios a prestar puede ser muy amplia (al igual que la gama de especialidades de la carrera), abarcando desde estudios de reforma de vehículos hasta proyectos de edificación, pasando por proyectos de legalización de actividad...

  1. Orden de 28 de noviembre de 2001, por la que se acuerda la puesta en marcha y se fija el número de registros territoriales de la propiedad intelectual de la Comunidad Autónoma de la Región de Murcia

    OpenAIRE

    Murcia (Comunidad Autónoma) Consejería de Turismo y Cultura

    2001-01-01

    Se acuerda la puesta en funcionamiento del Registro de la Propiedad Intelectual de la Comunidad Autónoma de la Región de Murcia como Registro Territorial integrado en el Registro General de la Propiedad Intelectual.

  2. Indoor Air Quality in Primary Schools

    OpenAIRE

    Freitas, Maria do Carmo; Canha, Nuno; Martinho, Maria; Almeida-Silva, Marina; Almeida, Susana Marta; Pegas, Priscilla; Alves, Célia; Pio, Casimiro; Trancoso, Maria; Sousa, Rita; Mouro, Filomena; Contreiras, Teresa

    2011-01-01

    Clean air is a basic requirement of life (World Health Organization, 2010). The Indoor Air Quality (IAQ) has been the object of several studies due to an increasing concern within the scientific community on the effects of indoor air quality upon health, especially as people tend to spend more time indoors than outdoors (Franck et al., 2011; Canha et al., 2010; WHO, 2010; Environmental Protection Agency, 2010; Saliba et al., 2009; Fraga et al., 2008; Fromme et al., 2007; Guo et al., 2004; ...

  3. Investigation on preparation of CuO-SnO2-CeO2/γ-Al2O3 catalysts for catalytic wet air oxidation process and their catalytic activity for degradation of phenol

    Institute of Scientific and Technical Information of China (English)

    SUN Xiao-jun; ZHANG Mi-lin; WAN Jia-feng; XIA Zhi; LIU Xiao-hui; LIU hui

    2008-01-01

    Catalytic Wet Air Oxidation process is an efficient measure for treatment of wastewater with great strength which is not biodegradable. Heterocatalysts now become the key investigation subject of catalytic wet air oxidation process due to their good stability and easy separation. In the paper, CuO-SnOE-CeO2/γ-Al2O3 catalysts are prepared by impregnation method, with SnO2 as a doping component, CuO as an active component, CeO2 as a structure stabilizer, γ-Al2O3 as a substrate. XPS test is carried out to investigate the effect of Sn on the chemical surrounding of Cu and O element on the catalyst surface and their catalytic activity. It is shown that the right do-ping of Sn can increase Cu+ content on the catalyst surface, as a result the quantity of adsorption oxygen is also increased. It is found that Cu + content on the catalyst surface is one of the primary factors that determin catalytic activity of catalyst through analyzing the catalytic wet air oxidation process of phenol.

  4. Experiencias de la instauración de normas relativas al contenido de plomo en aire y el agua, en los Estados Unidos de América Establishing lead in air and water standards in the United States of America

    Directory of Open Access Journals (Sweden)

    J Michael Davis

    2003-01-01

    Full Text Available En los Estados Unidos de América se ha logrado una disminución de la exposición a plomo de la población en general, gracias al establecimiento de diversas normas. En este artículo se destaca parte de los conocimientos adquiridos a través de la experiencia obtenida en este país en materia de plomo, en particular respecto al aire y al agua. Uno de los aspectos fundamentales es la posibilidad de contar con una base científica sólidamente establecida y claramente entendida, a partir de la cual se tomarán las medidas correspondientes. Los efectos secundarios de ciertas normas concernientes al aire ponen de manifiesto de qué manera los esfuerzos orientados a solucionar un problema pueden aportar beneficios en otras áreas, si bien pueden surgir consecuencias no deseadas, debido a la falta de previsión y de evaluación. Asimismo, en este documento se discuten las diferencias entre los enfoques centralizados y los descentralizados para el manejo de la exposición a plomo.Lead regulations and standards have resulted in a lower exposure to lead in the general population of the United States of America. This paper highlights some of the know-how developed through lead-containing experiences, particularly regarding lead content in air and water. The availability of a solid and clear scientific knowledge is central to the success of these policies. Collateral effects of some air-related standards show the extent to which problem-oriented efforts may be beneficial in other areas, inasmuch as they may have untoward consequences if careful planning and evaluation are not considered. Finally, this paper presents a discussion of the differences between centralized and decentralized approaches to lead exposure control.

  5. Characterisation of C–F Polymer Film Formation on the Air-Bearing Surface Etched Sidewall of Fluorine-Based Plasma Interacting with AL2O3–TiC Substrate

    Directory of Open Access Journals (Sweden)

    Alonggot Limcharoen

    2013-01-01

    Full Text Available C–F polymer redeposition is generated on the etched sidewall of the patterned air-bearing surface (ABS. This C–F polymer is a by-product from fluorine-based plasma using a Surface Technology Systems multiplex-pro air-bearing etch (ABE. The morphology of the re-deposition and the composite element was observed by a scanning electron microscope (SEM. The chemical bonding results were characterised via X-ray photoelectron spectroscopy, attenuated total reflected infrared spectroscopy and visible Raman spectroscopy. The purpose of this work is to demonstrate a modification of AlF3 re-deposition to C–F polymer re-deposition, which is easily stripped out by an isopropyl alcohol-based solution. The benefit of this research is the removal of the re-deposition in the resist strip process without additional cleaning process steps.

  6. Causas de fallo en la implantación del TPM y modelo de puesta en marcha integrador

    Directory of Open Access Journals (Sweden)

    Rafael Mateo Martínez

    2010-02-01

    Full Text Available Las empresas modernas precisan ser competitivas para sobrevivir en el mercado, por este motivo muchas compañías se plantean estrategias como el TPM (Total Productive Maintenance para la obtención de mejoras tangibles e intangibles en la organización que les ayuden a afrontar las dificultades del negocio. La gran mayoría de las organizaciones no son capaces de acometer con éxito la implantación del TPM, por no considerar las causas de fallo que se pueden presentar durante las diferentes etapas de desarrollo del modelo de implantación. El presente trabajo de investigación define, mediante un análisis de las publicaciones y estudios de caso existentes, un modelo genérico de implantación del TPM, y recopila las barreras, facilitadores y causas más comunes de fallo que se deben de tener en cuenta en cada etapa de su desarrollo y que pueden afectar al éxito de la implementación

  7. Territorios Rebeldes: la puesta en valor del patrimonio cultural en Tepoztlán, México.

    Directory of Open Access Journals (Sweden)

    Alfonso Valenzuela Aguilera

    2013-01-01

    Full Text Available El tradicional pueblo mexicano de Tepoztlán fue el modelo de referencia para la creación del programa federal conocido como Pueblos Mágicos, que en el fondo busca capitalizar la cultura y las tradiciones al “poner en valor” los atractivos turísticos de dichos lugares. Sin embargo, Tepoztlán ha sido un bastión de resistencia ante los intereses de las redes de capital global y en su historia reciente detuvo la construcción de un complejo inmobiliario multinacional que incluía un campo de golf, teniendo para ello que destituir a sus gobernantes locales. Sobre la base de condiciones identitarias que trascienden el ámbito local, se integrarían dentro de la estructura comunitaria tradicional la población extranjera y avecindada de otras regiones conformando un híbrido social que permitiría el desarrollo de efectivas dinámicas contestatarias basadas en la identidad, el arraigo y la organización social.

  8. Cadenas agroalimentarias orgánicas en el sur de chile: tensiones que condicionan su puesta en valor

    Directory of Open Access Journals (Sweden)

    Sandra Ríos Núñez

    2016-01-01

    Full Text Available El modelo industrial de producción de alimentos ha incentivado la emergencia de cadenas agrarias alternativas. Estas suponen modelos de producción fuertemente vinculados al territorio y tienen la finalidad de transitar desde la producción industrial a la captura de valor por medio de sistemas de producción que garanticen la seguridad y soberanía alimentaria. Esta investigación analiza el funcionamiento de la agricultura orgánica en Chile, en tanto producción agraria no convencional, con la finalidad de perfilar su desarrollo como una estrategia de captura de valor y producción de alimentos saludables especialmente para pequeños pro- ductores agrarios. Se busca visibilizar modelos de producción que reconectan el flujo de producción-circulación-consumo a través de un mecanismo de gobernanza que posibilite la captura de valor en el territorio.

  9. Una aproximación al sistema educativo primario Argentino durante el Peronismo. El caso de la provincia de Buenos Aires

    OpenAIRE

    Eva Mara Petiti

    2005-01-01

    La propuesta de este artículo es investigar la educación primaria durante el peronismo en la provincial de Buenos Aires. Nos centramos en las construcciones escolares, el Ministerio de educación, la ley de Estatuto del Docente y la ley de Educación.This article proposes investigating primary education during the Peron government in the province of Buenos Aires. We focus on the construction of schools, the Ministry of Education, the Teacher's Statute Act and the Education Act.

  10. Una mirada al tránsito de la comuna 3 de la Ciudad Autónoma de Buenos Aires : Diagnóstico y producción del Plan Integral para Peatones Solidarios y Conductores Responsables

    OpenAIRE

    Contartessi, Mariana; Forniciti, Florencia; Gonzalo, Diego; Pinto, Marcela

    2008-01-01

    A partir del análisis de la situación del tránsito en la Comuna 3 de la Capital Federal, el trabajo concluye con las propuestas para la elaboración y posterior presentación al Gobierno de la Ciudad Autónoma de Buenos Aires del Plan de Desarrollo Comunal de Seguridad Vial para Peatones Solidarios y Conductores Responsables. En la primera parte, los dos primeros capítulos desarrollan los paquetes conceptuales a través de los cuales se analizó la temática y culminan con el trabajo de campo sobre...

  11. Arte rupestre paleolítico y postpaleolítico al aire libre en los Montes de Toledo occidentales (Toledo, Castilla - La Mancha, España: noticia preliminar

    Directory of Open Access Journals (Sweden)

    Jesús F. JORDÁ PARDO

    2009-12-01

    Full Text Available RESUMEN: Se dan a conocer en este trabajo los grabados y pinturas rupestres localizados recientemente en el extremo occidental de los Montes de Toledo (comarca toledana de La Jara en la vertiente meridional de la Cuenca del Tajo. Una primera zona, situada en el valle del río Huso, se desarrolla al aire libre sobre afloramientos de pizarras y en ella se localizan al menos dos conjuntos rupestres: uno caracterizado por grabados de trazo fino atribuidos al Paleolítico Superior y otro realizado mediante diversas técnicas de grabado con una cronología muy amplia desde la Prehistoria reciente hasta épocas históricas. La segunda zona corresponde al valle del río Gévalo y por el momento corresponde a un único gran abrigo desarrollado en cuarcitas en cuyas paredes aparecen pinturas rojas atribuibles a la Prehistoria reciente sobre las que se superponen grabados de trazo fino y repiqueteado con elementos claramente prehistóricos y otros con un marcado carácter histórico.ABSTRACT: This paper deals with rock art findings recently located on the Western edge of Toledo Mountains at the Southern slope of Tagus Basin. The first finding área, placed in the valley of the Huso River, is an open air rock art site on shale outcrop where two main groups of patterns may be seen: fine - line engravings from Upper Palaeolithic times as well as several motifs using various engraving techniques rahging a wider time span from later prehistoric ages to historical times. The second área lies in the valley of the Gévalo River and is a large quartzite rock shelter containing on his walls red paintings dated on Postpalaeolithic times that placed under engravings made using fine-line and beating techbiques both from prehistórica! and historical ages.

  12. Educación para el desarrollo humano, educación como ayuda al crecimiento

    OpenAIRE

    Naval, C. (Concepción); Orduna, G. (Gabriela)

    2001-01-01

    El fenómeno social de la pobreza, es una de las mayores preocupaciones de las políticas de desarrollo a escala mundial, y es también uno de los más dificiles de solucionar. A pesar de los logros conseguidos hasta el momento, no se ha podido romper su presencia cíclica en todos los países del planeta. Con la mirada esperanzada puesta en el futuro, se propone en este trabajo titulado “Educación para el desarrollo humano, educación como ayuda al crecimiento”, una tesis sencilla...

  13. Interacción de atributos al priorizar requisitos a través de objetivos

    OpenAIRE

    Hadad, Graciela Dora Susana; Doorn, Jorge Horacio; Litvak, Claudia S.; Imparato, Carlos

    2015-01-01

    Una actividad que ejerce una fuerte influencia en la gestión de proyectos de software es establecer el orden de implementar los requisitos del software. Este ordenamiento determina la necesidad de recursos humanos y tecnológicos a lo largo del tiempo, el modo de puesta en operación parcial del software y su mantenimiento, entre otras actividades. Es uno de los motores de la evolución de los requisitos implementados y a implementar debido a realimentaciones de los usuarios al comenzar a utiliz...

  14. Los nuevos desafíos de la puesta en práctica de las políticas de saneamiento ambiental

    Directory of Open Access Journals (Sweden)

    Chamizo Garcia, Horacio Alejandro

    2009-07-01

    Full Text Available Se presentan los resultados más importantes de una revisión bibliográfica sobre el tema de análisis de la gestión de políticas de saneamiento ambiental en asentamientos humanos. La revisión se propuso identificar factores determinantes de la gestión en estudios realizados en diversos países y particularmente en América Latina, tomando como referencia el neoinstitucionalismo y sus vertientes teóricas histórica, sociológica, normativa y de elección racional racional. Como principales resultados se identifica el papel que tiene la resistencia por parte de actores estratégicos frente a las nuevas ideas así como la influencia de los paradigmas dominantes y su socialización. Se constata también la influencia que tiene el marco normativo formal y particularmente el diseño de los espacios de interacción intersectorial en el abordaje del saneamiento ambiental desde una perspectiva compleja. Así mismo, se evidencia el papel de las relaciones de agencia en condiciones de cuasimercados y su influencia en la conformación de redes de actores. Los hallazgos explican integradamente los principales factores que influyen durante la puesta práctica políticas públicas de gran relevancia para la salud de la población y la reducción de inequidades sociales.

  15. ¿De dónde vienen? Aprovisionamiento de rocas sedimentarias silíceas en el yacimiento magdaleniense al aire libre de Montlleó (Prats i Sansor, Lleida

    Directory of Open Access Journals (Sweden)

    Sánchez de la Torre, Marta

    2016-06-01

    Full Text Available Results obtained after the archaeopetrological analyses of lithic tools from the open-air site of Montlleó (Prats i Sansor, Lleida are presented below. Macroscopic, microscopic and geochemical observation permitted recognitionof the textural, petrographic, micropaleontological, as well as mineralogical composition of the exploited cherts. Results confirm that Montlleó was placed at a crossroad area used repeatedly at the end of the Upper Palaeolithic. These results show that geographical barriers did not impede human mobility between both Pyrenean slopes.En este artículo se presentan los resultados obtenidos tras la caracterización arqueopetrológica de los materiales líticos del yacimiento al aire libre de Montlleó (Prats i Sansor, Lleida. El estudio desarrolla una observación macroscópica, microscópica y geoquímica para conocer las características texturales, petrográficas y micropaleontológicas, así como la composición mineralógica de los tipos de sílex explotados. Los resultados de este trabajo confirman que el yacimiento de Montlleó fue una encrucijada de caminos transitados reiteradamente al fin del Paleolítico superior, evidenciando la inexistencia de barreras geográficas que imposibilitaran la movilidad entre ambas vertientes del área pirenaica centro-oriental.

  16. A review of experiences with AL-6XN{sup R} and Zeron{sup R} 100 in air pollution control equipment

    Energy Technology Data Exchange (ETDEWEB)

    Wachowiak, D.M.; Wilson, J.D. [Rolled Alloys, Temperance, MI (United States)

    2009-07-01

    This paper discussed the use of a super austenitic alloy (AL-6XN) and a super duplex stainless steel ZERON 100 alloy in flue gas desulphurization (FGD) and wet electrostatic precipitator (WESP) applications. The corrosion-resistant alloys were subjected to corrosion tests in multiple corrosive environments at high temperatures. Corrosion test data for both alloys were presented. Case studies of the alloys in mining, power station, slurry piping and various FGD plant applications were also outlined. The study showed that ZERON 100 has twice the yield strength of many other stainless steels and austenitic alloys. The high strength of the AL-6XN allows for reductions in the tank and processing equipment thickness. It was concluded that the alloys can be used in the high chloride, sulfuric acid-containing environments of many pollution control systems. 7 tabs., 10 figs.

  17. Perfiles verticales de ozono y del coeficiente de extinción: contribución al diagnóstico de la calidad del aire en Segovia

    OpenAIRE

    Torre Martín, Beatriz de

    2016-01-01

    Debido a sus efectos adversos el ozono es uno de los contaminantes atmosféricos prioritarios a escala planetaria. El ozono es un destacado objetivo de investigación dentro de la ciencia de la atmósfera en el momento actual. Una valoración de los niveles de ozono en la ciudad de Segovia transferidos por la Consejería de Medio Ambiente y Ordenación del Territorio de la Junta de Castilla y León revela una calidad del aire por ozono aceptable acorde con el tamaño de la ciudad y la densidad de...

  18. „Un caractère qui a l'air si impossible“: Innerer Konflikt als Rollendialektik in Le Rouge et le Noir

    Directory of Open Access Journals (Sweden)

    Hanna Klimpe

    2011-12-01

    Full Text Available Le Rouge et le Noir traite de l'ascension sociale du prolétaire Julien Sorel sous la Restauration. Julien est séminariste et méprise de fait les valeurs de la Restauration. En secret, il rêve de mener une existence héroïque sur le modèle de Napoléon. Le rôle idéal de Napoléon et le rôle social de prêtre sont conçus comme contraires, mais peuvent, néanmoins, difficilement être séparés dans les actions concrètes de Julien. La présente étude porte sur la dialectique entre l'idéal de Napoléon et la réalité de prêtre, et s'inscrit tant dans les sciences littéraires que dans la théorie des rôles sociaux, avec le but d'intégrer la perspective de la sociologie ainsi que celle de l'anthropologie.In Le Rouge et le Noir erzählt Stendhal den sozialen Aufstieg des Kleinbürgersohns Julien Sorel in der Restaurationsgesellschaft. Julien ist ein Priesterschüler, der die Restaurationsgesellschaft und ihre Werte verachtet und heimlich eine napoleonische Heldenexistenz ersehnt. „Napoleon“ und „Priester“ werden in der literaturwissenschaftlichen Rezeption des Werkes dabei immer wieder als Rollen interpretiert. Diese beiden Rollen sind zwar konträr konzipiert, in Juliens Handlungen aber kaum voneinander zu trennen. Die Dialektik von Napoleon-Ideal und Priester-Realität wird hier mit Hilfe literaturwissenschaftlicher Rezeptionsansätze, sowie unter den soziologischen und  anthropologischen Perspektiven der Rollentheorie untersucht.

  19. Comments on “Impact of California’s Air Pollution Laws on Black Carbon and their Implications for Direct Radiative Forcing” by R. Bahadur et al.

    Science.gov (United States)

    Schichtel, Bret A.; Pitchford, Marc L.; White, Warren H.

    2011-08-01

    Using data from the Interagency Monitoring of Protected Visual Environments (IMPROVE) program, Bahadur et al. (2011) report that average fine particulate light absorbing carbon (LAC) concentrations in California decreased by about 50% from 0.46 μg m -3 in 1989 to 0.24 μg m -3 in 2008. They attribute most of the LAC decline in California to reductions in the state's diesel emissions. These findings are encouraging, but in this comment we call attention to a significant methodological issue that can arise in any long-term trends analysis using IMPROVE data. In the Bahadur et al. analysis, LAC data from eighteen remote monitoring sites were aggregated with data from three urban sites that only operated for 1-8 years. The large absolute decrease of 0.22 μg m -3 they reported in the statewide California average was largely driven by one urban site, South Lake Tahoe (Tahoe), which was dropped from the network in mid-1997. LAC concentrations at Tahoe were an order of magnitude higher than those at nearby Bliss State Park indicative of large local source contributions. The exclusion of the three locally influenced urban sites substantially reduces the magnitude of the decreasing LAC trends shown in Bahadur et al., though this does not necessarily invalidate the paper's conclusion that LAC is broadly decreasing and diesel emission controls are likely to be responsible for part of this decrease. Control of emissions from wood-burning stoves may also have contributed to decreases in LAC and other particulate compounds; like diesel emission controls, this too is an important regulatory success.

  20. Farklı Çalışma Ortamlarında Oluşabilecek Hava Kirliliğinin Çalışanların Sağlığı Üzerindeki Etkileri / The Effects of Air Pollution on Workers’ Health In Different Work Places

    Directory of Open Access Journals (Sweden)

    Simge Taner

    2012-12-01

    ıyla ilgili alınabilecek tedbirler açıklanmaya çalışılmıştır. The Effects of Air Pollution on Workers’ Health In Different Work Places Air quality in industrial and non-industrial work places (such as school, office, photocopy center, restaurant is very significant not only for workers’ comfort, but also for their health. Generally, parameters such as temperature, moisture, air exchange rate, sulphur dioxide (SO2, carbon dioxide (CO2, suspended particulate matter (PM, hydrogen sulphide (H2S, volatile organic compounds (VOC, nitrogen oxides (NOx, carbon monoxide (CO, ozone (O3, radon, hydrogen fluoride (HF, formaldehyde (HCHO and microbial control are analyzed for indoor air quality assessment. With the help of these analyses some important foresights could be made for workers’ health. Lots of pollutant can be defined in production areas, especially metal processing and iron steel industry compared to other working places. In our country, not only production sector but also mining operations have lots of health risks for human and environment. Although occupational diseases have notable risks for employees working in mines, there are not adequate analyses. In this study, parameters which have adverse effects on indoor air quality in mining and metal sectors are investigated and some measures suggested to protect for employees’ health working in these sectors.

  1. La alta sociedad, el mundo de la cultura y la modernización en la Buenos Aires del cambio del siglo XIX al XX

    Directory of Open Access Journals (Sweden)

    Losada, Leandro

    2006-12-01

    Full Text Available The article analyses the intellectual sociabilities and the trajectories of some of the most outstanding figures of this spheres in the Buenos Aires of the turn of the XIX to XX century. The main purpose is to think about the impact of the profound economic, social, political and cultural changes that affect the Argentina in this period, between them the professionalisation of the intellectual activities, over the central role that, until then, had played the traditional high society in the cultural field. The article hypothesis is that these mutations decreased that role, and, therefore, to belong to the traditional elite might be a relevant capital but not a crucial one to obtain success or prestige in the cultural field.

    En el artículo se abordan las sociabilidades intelectuales y las trayectorias de algunos de los personajes más destacados en estas esferas en la Buenos Aires del novecientos. El propósito central es reflexionar sobre el impacto que los profundos cambios económicos, sociales, políticos y culturales que se produjeron en la Argentina por entonces, entre ellos la profesionalización de las actividades intelectuales, tuvieron sobre el rol central que hasta el fin de siglo había ocupado la alta sociedad tradicional en el campo de la cultura. La hipótesis del artículo es que dichas mutaciones desdibujaron ese papel, y en consecuencia, pertenecer o estar vinculado a la elite tradicional pudo ser un capital relevante pero no ya decisivo para obtener éxito o reconocimiento en el mundo de la cultura.

  2. para su puesta en marcha

    Directory of Open Access Journals (Sweden)

    Sergio Franco Maass

    2004-01-01

    Full Text Available Los sistemas de información geográfica (SIG tienen una gran aplicación en la gestión municipal; permiten cumplir con dos objetivos fundamentales: el registro de información territorial y el análisis de problemas territoriales específicos. Con el fin de determinar la viabilidad de este tipo de tecnologías en el ámbito municipal, se enfrentó el problema de la localización de instalaciones para la disposición final de residuos sólidos urbanos en el municipio de Toluca, Estado de México. Se identifican ciertos aspectos que limitan la práctica de los SIG: la diversidad entre los municipios, los problemas administrativos, las deficiencias de la información y la carencia de recursos humanos, técnicos y financieros.

  3. NiMo/Al{sub 2}O{sub 3}-MgO (x) catalysts. The effect of the prolonged exposure to ambient air on the textural and catalytic properties

    Energy Technology Data Exchange (ETDEWEB)

    Solis, D.; Klimova, T.; Ramirez, J. [Departamento de Ingenieria Quimica, Facultad de Quimica, UNAM. Cd. Universitaria,, Coyoacan (Mexico); Cortez, T. [Instituto Mexicano del Petroleo, Tratamiento de Crudo Maya, Eje central Lazaro Cardenas 152, Col. San Bartolo Atepehuacan, C.P. (Mexico)

    2004-11-24

    In the search to obtain stable catalysts for selective elimination of sulfur from gasoline, maintaining octane number, NiMo catalysts supported on Al-Mg mixed oxides were prepared by the sol-gel method and evaluated after 6-month storage in contact with ambient air, the results were compared with the freshly prepared samples. Both, freshly prepared and aged samples were characterized by nitrogen physisorption measurements (S{sub BET}), infrared spectroscopy (FT-IR) and X-ray powder diffraction (XRD) and high-resolution electron microscopy (HREM), they were tested in the thiophene hydrodesulfurization reaction.The results indicate that the incorporation of small amounts of magnesia (5mol%) into the alumina support, leads to the catalyst with low hydrogenation function and appropriate stability during prolonged contact with ambient conditions.

  4. Enfoque por competencias, ¿una respuesta al fracaso escolar?

    Directory of Open Access Journals (Sweden)

    Philippe Perrenooud

    2009-01-01

    Full Text Available Son tiempos de reflexión sobre las competencias. Queda mucho por investigar acerca de sus posibilidades pero es cierto que, desde el punto de vista teórico, el enfoque por competencias se presenta como potente al complementar una pedagogía que, tradicionalmente, se ha centrado en las disciplinas y en los saberes. Pero también este enfoque aparece fuerte en el campo de la formación en la medida en que viene vinculado a las prácticas sociales y educativas, al trabajo pedagógico de los problemas educativos en las diferentes situaciones, a los proyectos que los educadores desean materializar en sus lugares de trabajo. Están por demostrar las expectativas puestas en el enfoque por competencias y este texto trata de pensar toda una serie de cuestiones relacionadas con su puesta en marcha en los contextos formativos.---------------------------------------------------------------------These are times for reflection on skills. There is much left to investigate on their possibilities but it is true that, from the theoretical point of view, the skill approach appears to be powerful by complementing a pedagogy which, tradicionally, has focused on the knowledge and disciplines. But this approach appears strongly in the training field as it is linked to the social and educational practices, to the pedagogic work on educative problems, to the different situations, to the project that teachers wish to materialize in the labor places. Still to be demonstrated are the expectations on the skills approach, and this text tries to think on a series of matters related with its set in motion in the learning contexts.

  5. El retrato fotográfico en la Buenos Aires decimonónica: la burguesía se representa a sí misma The photographic portrait in nineteenth century Buenos Aire's: the bourgeoisie represents itself

    Directory of Open Access Journals (Sweden)

    Andrea Cuarterolo

    2006-06-01

    Full Text Available A partir de la llegada del daguerrotipo al Río de la Plata en 1840 el negocio fotográfico fue pronto monopolizado por los retratistas. La fotografía, que con su exactitud superaba la habilidad manual de cualquiera de los pintores instalados en el país en ese momento, fue acogida con entusiasmo por la sociedad porteña. Sin embargo, el elevado precio que debía pagarse por pasar a la inmortalidad hizo, que la fotograf ía en sus primeras dos décadas fuera un lujo reservado solamente a las clases acomodadas. Lejos de la instantaneidad de las imágenes actuales, los retratos al daguerrotipo implicaban largos tiempos de exposici ón y esto significaba que eran ante todo posados. Estas primeras imá- genes pueden ser consideradas, entonces, como documentos que sirven para reconstruir los contenidos de la mentalidad burguesa en el Río de la Plata a mediados del siglo XIX. Estos retratos eran el resultado del esfuerzo de estas elites por imponer al futuro una determinada imagen de sí mismas. A través de la puesta en escena, decidida de común acuerdo entre el fotógrafo y el retratado, la burguesía rioplatense transmitía a la posteridad mensajes, ideas, prejuicios, comportamientos y modos de ver muy específicos de su clase.Ever since the introduction of the daguerreotype to the Río de la Plata region in 1840, formal studio portraits became daguerreotypists . main source of income. This novelty, which made it possible to obtain likenesses more exact than those produced by the portrait painters settled in the country by that time, was warmly welcomed by the Buenos Aires society. Nevertheless, at the peak of the daguerreotype period in the 1850.s, photography was an expensive luxury that only members of the higher classes could afford. Unlike today.s candid portraits and due to the technological limitations of the process, daguerreotype portraits required long exposure times and sophisticated poses. These first records can then be considered

  6. Cambios de uso del suelo e impactos sobre el agua subterránea en un barrio al Sur de Tandil, Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Corina Iris Rodriguez

    2013-06-01

    Full Text Available Este trabajo se basa en el análisis los cambios de uso del suelo en el período 2003-2011 en un barrio de 79,62 ha ubicado al S interserrano de la ciudad de Tandil, y su vinculación con la calidad y disponibilidad de agua subterránea. El mapeo de imágenes satelitales y su contrastación en campo evidenciaron los cambios ocurridos en los usos del suelo del área de estudio, pasando de lotes sin uso definido y de cultivos a un incremento de aprovechamientos residenciales y turístico-comerciales principalmente. Sin embargo, como el sector no es abastecido por servicios de agua de red y sistema cloacal, se utilizan perforaciones particulares para la extracción de agua del acuífero libre, para consumo humano y uso recreativo, y se depositan los efluentes domiciliarios en pozos absorbentes. Los habitantes informaron sobre distintas problemáticas relacionadas al uso del agua tales como secado de pozos, necesidad de perforar a mayor profundidad, problemas de calidad del agua, escasez en época estival y para el llenado de piletas y colmatación de pozos ciegos en eventos de precipitaciones extremas. En 2011 se midieron los niveles freáticos y se tomaron muestras de agua para conocer la conductividad eléctrica (CE y el contenido de nitratos. La CE osciló entre 480 y 1400 µS/cm denotando contaminaciones puntuales en la zona con mayor número de viviendas. El mismo comportamiento tienen los nitratos, variando desde 6 a 85 mg/L, con un punto que supera 200 mg/L. Estas alteraciones están ocasionadas principalmente por la disposición in situ de los efluentes domiciliarios, que genera un ciclo semicerrado de disposición - transporte - extracción del agua. La falta de planificación territorial con visión ambiental, sumada a la ausencia de servicios sanitarios y la ocupación en cabeceras de cuenca, pone en peligro la calidad y disponibilidad de agua subterránea y en riesgo a la salud de quienes lo consumen.

  7. Seltzer_et_al_2016

    Data.gov (United States)

    U.S. Environmental Protection Agency — This dataset supports the modeling study of Seltzer et al. (2016) published in Atmospheric Environment. In this study, techniques typically used for future air...

  8. Crater geometry characterization of Al targets irradiated by single pulse and pulse trains of Nd:YAG laser in ambient air and water

    International Nuclear Information System (INIS)

    High intensities laser pulses are capable to generate a crater when irradiating metal targets. In such condition, after each irradiation significant ablation occurs on the target surface and as a result a crater is formed. The crater characterization is very important specifically for some applications such as micromachining. In this paper, the crater formation in metal targets was studied experimentally. The planar aluminum 5052 targets were irradiated by frequency doubled (532 nm), Q-switched Nd:YAG (∼6 ns) laser beam in ambient air and distilled water. A crater was produced after each irradiation and it was characterized by an optical microscope. Different laser intensities as well as pulse trains were applied for crater formation. The effects of laser characteristics in crater geometry were examined. The depth of the craters was measured by optical microscope and the diameter (width) was characterized by processing of the crater image. The results were explained in terms of ablation threshold and plasma shielding. The results show that the crater geometry extremely depends on the laser pulse intensity, the number of laser pulses, and ambient.

  9. Assembly of octadecyl phosphonic acid on the {alpha}-Al{sub 2}O{sub 3} (0 0 0 1) surface of air annealed alumina: Evidence for termination dependent adsorption

    Energy Technology Data Exchange (ETDEWEB)

    Liakos, Ioannis L. [European Commission-Joint Research Centre-IHCP, Physical and Chemical Exposure Unit, Via Fermi 1, 21020 Ispra (Italy)], E-mail: ioannis.liakos@jrc.it; McAlpine, Eoghan [Innoval Technology (formerly Alcan International), Beaumont Close, Banbury OX16 1TQ (United Kingdom); Chen Xinyong [Laboratory of Biophysics and Surface Analysis, School of Pharmacy, University of Nottingham, NG7 2RD (United Kingdom); Newman, Roger [University of Toronto, Department of Chemical Engineering and Applied Chemistry, 200 College Street, Toronto, Ontario M5S 3E5 (Canada); Alexander, Morgan R. [Laboratory of Biophysics and Surface Analysis, School of Pharmacy, University of Nottingham, NG7 2RD (United Kingdom)], E-mail: morgan.alexander@nottingham.ac.uk

    2008-12-30

    Self-assembly of octadecyl phosphonic acid (ODPA) from solution to the (0 0 0 1) plane surface of single crystal alumina is studied using atomic force microscopy (AFM), wettability measurements, transmission infrared spectroscopy and X-ray photoelectron spectroscopy (XPS). The crystals were annealed in air at 1300 deg. C to produce a surface with terraces of 0.2 nm height. This resulted in a surface comprising a mixture of terraces terminated by either oxygen or aluminium atoms. After exposure of this surface to a solution of ODPA, the XPS C1s core level reveals partial displacement of adventitious carbonaceous material by the ODPA. The phase contrast image from tapping mode AFM acquired during assembly reveals that the surface chemistries of terraces differ significantly, suggesting along with the topography images that ODPA molecules adsorbed preferentially to certain terraces. We suggest that the ODPA adsorbs preferentially to the aluminium terminated terraces that are hydroxylated in air. The adsorption to only Al-terminated terraces at the micron scale is consistent with the apparent low coverage of ODPA estimated using techniques sampling the surface on a millimetre scale including XPS and wettability measurements. This behaviour is compared to ODPA close-packed monolayer coverages formed on the amorphous oxide/hydroxide surface of aluminium metal.

  10. An Evaluation of Uncertainty Associated to Analytical Measurements of Selected Polycyclic Aromatic Compounds in Ambient Air; Estudio sobre las Incertidumbres Asociadas al Metodo de Determinacion de PAC's Seleccionados en Muestras de Aire Ambiente

    Energy Technology Data Exchange (ETDEWEB)

    Barrado, A. I.; Garcia, S.; Perez, R. M.

    2013-06-01

    This paper presents an evaluation of uncertainty associated to analytical measurement of eighteen polycyclic aromatic compounds (PACs) in ambient air by liquid chromatography with fluorescence detection (HPLC/FD). The study was focused on analyses of PM{sub 1}0, PM{sub 2}.5 and gas phase fractions. Main analytical uncertainty was estimated for eleven polycyclic aromatic hydrocarbons (PAHs), four nitro polycyclic aromatic hydrocarbons (nitro-PAHs) and two hydroxy polycyclic aromatic hydrocarbons (OH-PAHs) based on the analytical determination, reference material analysis and extraction step. Main contributions reached 15-30% and came from extraction process of real ambient samples, being those for nitro- PAHs the highest (20-30%). Range and mean concentration of PAC mass concentrations measured in gas phase and PM{sub 1}0/PM{sub 2}.5 particle fractions during a full year are also presented. Concentrations of OH-PAHs were about 2-4 orders of magnitude lower than their parent PAHs and comparable to those sparsely reported in literature. (Author) 7 refs.

  11. Primary study of the isothermal phase diagram of the Cu2O-Al2O3-SiO2 ternary system at 1150℃ in air

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The isothermal phase diagram of the Cu2O-Al2O3-SiO2 ternary system at 1150℃ was reported for the samples which were prepared from sol-gel method and quenched by water after being heated at 1150℃ for 12 h. Based on the conventional X-ray powder diffraction (XRD) and in situ high-temporature XRD quantitative analysis, in addition to scanning electron microscopy measurement, the phase identification was achieved. Combining the deduction from the component phase diagrams of the binary systems using the phase equilibrium theorem, the primary isothermal phase diagram was plotted over the composition area Cu2O-mullite-SiO2. In this area, the approximate composition areas of two two-phase regions and one three-phase region, (L2 + Cr), (L2 + M), and (L1 + L2 + Tr), were determined. Moreover, the precise composition areas of both of the three-phase regions (L2 + Cr + M) and (L2 + M + A) were determined according to the results of conventional and in situ high-temperature XRD quantitative analysis by Rietveld method.

  12. La Guerra del Chaco como desafío al panamericanismo: el sinuoso camino a la Conferencia de Paz de Buenos Aires, 1934-1935

    Directory of Open Access Journals (Sweden)

    Óscar Javier Barrera Aguilera

    2011-05-01

    Full Text Available Normal 0 21 false false false ES-CO X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabla normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Se presenta un acercamiento crítico a la efectividad de la maquinaria de paz americana que buscó poner fin al conflicto entre Bolivia y Paraguay por el Chaco Boreal. Luego de exponer los ideales de buena vecindad, hemisferio occidental y unidad latinoamericana, se destacan los obstáculos con que estos tropezaron para concretarse en las diferentes fórmulas mediadores planteadas a lo largo de los años 1934 y 1935. A través de documentación diplomática, son analizados los intereses que motivaron la actuación de los gobiernos mediadores. El texto evidencia que las negociaciones en torno a la Guerra del Chaco catalizaron antiguas tensiones y se dieron en un escenario paralelo donde también midieron fuerzas los países cercanos a la región en disputa, así como buena parte de los gobiernos del continente.

  13. Investigations of power supply and propulsion for a lighter-than-air high altitude platform; Untersuchungen zu Energieversorgung und Antrieb einer Leichter-als-Luft-Hoehenplattform

    Energy Technology Data Exchange (ETDEWEB)

    Kotulla, Michael

    2008-06-20

    high altitude applications. With the given simulation model one possible solution for the drive and power generation system of a lighter-than-air high altitude platform has been worked out. (orig.)

  14. ALS - resources

    Science.gov (United States)

    Resources - ALS ... The following organizations are good resources for information on amyotrophic lateral sclerosis : Muscular Dystrophy Association -- mda.org/disease/amyotrophic-lateral-sclerosis National Amyotrophic Lateral Sclerosis (ALS) Registry -- ...

  15. Air Pollution

    Science.gov (United States)

    Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and ... Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, ...

  16. Metodología y diseño para la puesta en práctica de un sistema termodinámico para la aclimatación de las aguas un spa

    OpenAIRE

    Galán Cerrajero, Sergio

    2013-01-01

    El objetivo de este Proyecto Fin de Carrera es la instalación de un sistema de aclimatación para una piscina de un spa. Para ello utilizaremos una nueva tecnología que se basa en algo tan sencillo como un ciclo de Carnot. Lo revolucionario es el uso de un refrigerante de baja temperatura que circula a través de unos paneles colocados a la intemperie, lo que les ayuda al intercambio térmico con el aire del ambiente. Estos sistemas termodinámicos para obtención de agua caliente sanitaria son...

  17. El derecho al aborto en discusión: la intervención de grupos católicos en la comisión de salud de la legislatura de la ciudad de Buenos Aires The debate on abortion rights: the involvement of catholic groups in the health committee of the Buenos Aires legislature

    Directory of Open Access Journals (Sweden)

    Gabriela Irrazábal

    2010-08-01

    Full Text Available El presente trabajo da cuenta de la participación de grupos católicos especializados en bioética y "bioderecho" en los debates parlamentarios sobre aborto no punible en la Comisión de Salud de la Ciudad de Buenos Aires a fines de 2008. Teniendo en cuenta las múltiples transferencias e influencias entre los campos político y religioso en Argentina, se intentará abordar la estrategia política que ciertos actores del catolicismo utilizan para consolidar la hegemonía simbólica de la Iglesia Católica en la regulación de la vida de los individuos, especialmente de las mujeres y la utilización de estas estrategias como apuestas de estos grupos para mantener su lugar hegemónico al interior de la Iglesia Católica.This paper discusses the participation of Catholic groups, specialized in bioethics and biolaw, in parliamentary debates on non-punishable abortion, in the Health Committee of the City of Buenos Aires, in late 2008. Taking into account the multiple transfers and influences between the political and the religious spheres in Argentina, the article examines the political strategy that certain actors of Catholicism use to consolidate the symbolic hegemony of the Catholic Church by regulating the life of individuals, especially women; and the use of these strategies as a way to maintain their hegemonic position within the Catholic Church.

  18. Análisis del desarrollo de la puesta en escena de una situación didáctica “la función exponencial 2^x ” con estudiantes de bachillerato

    OpenAIRE

    Lezama, Javier; López, Jorge

    2005-01-01

    La investigación “Análisis del desarrollo de la puesta en escena de una situación didáctica”, cuyos propósitos están encaminados a identificar los efectos didácticos que se producen en el escenario cuando los estudiantes de bachillerato emplean criterios geométricos para construir segmentos y localizar algunos puntos de la función exponencial 2^x; tiene como Marco Teórico la Teoría de Situaciones de (Brousseau, 1993) y la Teoría de la Transposición Didáctica de (Chevallar, 1991). Como metodol...

  19. Documentación, puesta en marcha y monitorización de un banco de ensayos destinado a la investigación de paneles fotovoltaicos conectados a red

    OpenAIRE

    López Martínez, Elena

    2015-01-01

    El objetivo de este proyecto consta de dos partes, documentación del proceso de instalación y puesta en marcha de una central fotovoltaica de generación de energía de 5 kW conectada a la red de baja tensión situada sobre la cubierta de la terraza del edificio del Centro de Desarrollo e Innovación Tecnológica (CEDIT) de la Universidad Politécnica de Cartagena (UPCT) situado en el Parque Tecnológico de Fuente Álamo, así como la realización de los pertinentes manuales de uso de la ...

  20. El miedo al rey

    Directory of Open Access Journals (Sweden)

    François FORONDA

    2007-01-01

    Full Text Available La peur du roi. Sources et premières réflexions à propos d’une émotion aristocratique dans la Castille du XIVe siècleFace à un roi qui à présent pousse les effets de son ire jusqu’au meurtre pour faire le vide autour de lui et imposer sa différence souveraine, ses parents et les riches hommes, soit les principaux visés par cette politique de l’arbitraire qui enfreint les règles du jeu autant qu’elle contribue à les redéfinir, disent la peur (metus qu’ils ressentent, qu’ils utilisent aussi afin de donner à leur stratégie de pouvoir un fondement légitime. Et l’expression de cette émotion politique, qui tend à se muer en un stéréotype d’un discours aristocratique d’opposition, surtout présente dans les chroniques, mises ici en relation ici avec d’autres sources, notamment des correspondances, marque profondément l’histoire des relations souvent conflictuelles au sein de cette compagnie en définitive très étroite pendant un siècle, de la fin du XIIIe siècle à la fin du XIVe siècle. Cet article se propose d’ébaucher une première réflexion sur le sujet et d’en présenter les principales sources.El miedo al rey. Fuentes y primeras reflexiones acerca de una emoción aristocrática en la Castilla del siglo XIVFrente a un rey que ahora lleva hasta la muerte los efectos de su ira para hacer el vacío entorno a su persona e imponer su soberana, sus parientes y ricos hombres, o sea los principales afectados por esta política de la arbitrariedad que rompe las reglas del juego a la vez que contribuye a redefinirlas, dicen el miedo (metus que sienten, que utilizan también para darle a su estrategia de poder un fundamento legítimo. Y la expresión de esta emoción política, que tiende a convertirse en un estereotipo de un discurso aristocrático de oposición, sobre todo presente en la crónicas, aquí puestas en relación con otras fuentes, en particular cartas, marca profundamente la historia de

  1. HILOS DE TEATRO: LA PUESTA EN ESCENA DEL PALACIO DE LOS SOVIETS DE LE CORBUSIER, 1931 / Strands of theatre: Le Corbusier’s staging of the Palace of the Soviets, 1931

    Directory of Open Access Journals (Sweden)

    Josefina González Cubero

    2012-11-01

    Full Text Available RESUMEN El proyecto para el concurso del Palacio de los Soviets en Moscú (1931 de Le Corbusier plantea otra posible y más fragmentaria clave de interpretación que, aunque en principio sea más marginal, merece ser mencionada: la relación con el teatro, con la renovación de la escena europea y con la experimentación soviética, porque Le Corbusier es consciente de que la arquitectura no consiste sólo en la cualidad del edificio, es también una puesta en escena, una dramaturgia. Escenógrafos como Appia, con la luz, o directores de escena como Max Reinhardt, con el espectáculo de masas, y Vsevelod Meyerhold, con el teatro japonés del Kabuki, van penetrando en el sentir de un Le Corbusier que deja la impronta teatral en la puesta en escena de la megaestructura moscovita.SUMMARY Le Corbusier’s design submitted to the public competition for the Palace of the Soviets in Moscow (1931 may have an additional interpretation which, although less researched and in principal more marginal, is noteworthy. And that is the relationship between theatre and the resetting of the stage in Europe and Soviet experimentation. Le Corbusier was aware that architecture goes beyond the building itself and is also a sort of staging or dramaturgy. Set designers such as Appia, through the use of light, or stage directors like Max Reinhardt, through the use of performance for the masses, and Vsevelod Meyerhold, through Japonese Kabuki theatre, gradually permeated the sensibility of Le Corbusier who left staging as a mark in his design for the Moscow megastructure.

  2. Las relaciones pedagógicas entre profesores y alumnos al incorporar el uso de las tecnologías computacionales en el ámbito escolar

    OpenAIRE

    Cruz, Miguel Ángel; Acosta, Juana; Hernández, Jorge

    2009-01-01

    El presente trabajo muestra algunas de las experiencias obtenidas en la puesta en práctica del proceso didáctico que propone el programa EMAT –Hidalgo con un grupo de docentes que imparten la asignatura de matemáticas en el nivel de educación secundaria modalidad técnica. La investigación permitió identificar el tipo de relaciones entre profesores y estudiantes al incorporar el uso de las tecnologías computacionales en el ámbito escolar. Para ello, se hicieron entrevistas, encuestas y observa...

  3. Aportaciones a la transición del hiero I al hierro II en el centro de la cuenca del udero

    Directory of Open Access Journals (Sweden)

    Manuel GARCÍA ALONSO

    2009-10-01

    Full Text Available En la diversidad de publicaciones que se ponen al alcance del investigador, y que son referidas a la Edad del Hierro, entendida de una manera amplia, se viene observando, en el manejo terminológico más bien, una serie de cuestiones que quedan latentes entre las diferentes tomas de postura; pero que, salvo excepciones, no dan pie a una discusión o puesta en común de las mismas, y que entendemos son de capital importancia para la zona objeto de la presente comunicación.

  4. Efecto de la fuente y el nivel de fibra en pienso de pollitas durante la fase de recría sobre la productividad en puesta.

    OpenAIRE

    Bouali, O.; Perez-Bonilla, A.; Guzmán, P; Mandalawi, H. A.; Gonzalez Mateos, Gonzalo

    2013-01-01

    La fibra dietética es un componente importante de las dietas de las aves. La inclusión en el pienso de ciertos tipos de fibra en cantidad adecuada mejora la adaptación del tracto gastrointestinal (TGI) a los actuales sistemas de producción y de alimentación, reduciendo los trastornos digestivos y mejorando la productividad global (Jiménez-Moreno et al., 2009; Mateos et al., 2002). La fibra dietética puede aumentar el tiempo de retención de la digesta en la parte proximal del TGI y tiene un ma...

  5. Air Abrasion

    Science.gov (United States)

    ... delivered directly to your desktop! more... What Is Air Abrasion? Article Chapters What Is Air Abrasion? What Happens? The Pros and Cons Will I Feel Anything? Is Air Abrasion for Everyone? print full article print this ...

  6. Afrolatinoamericanas... una experiencia de subversión estereotípica en el museo de la mujer de Buenos Aires

    OpenAIRE

    Lea Geler

    2012-01-01

    En este trabajo me centraré en la perfomance teatral Afrolatinoamericanas..., realizada en el Museo de la Mujer de Buenos Aires a finales del año 2010 por un grupo de teatro dedicado a la tematización de la afrodescendencia en la Argentina, un país que hasta hoy día sigue considerándose blanco-europeo y que sostiene que la población de descendientes de esclavizados/as africanos/as ha desaparecido. El análisis de la puesta en escena de dicha obra, en conjunto con el de fuentes históricas, perm...

  7. Reforma al sistema recursivo, la interpretación del Tribunal de Casación de la Provincia de Buenos Aires y la posible litigación recursiva en materia de Hábeas Corpus (por agravamiento de las condiciones de detención) y Medidas de Coerción Personal (plazos irrazonables de la prisión preventiva)

    OpenAIRE

    Lavalle, Agustín Matías

    2010-01-01

    Reforma al sistema recursivo, la interpretación del Tribunal de Casación de la Provincia de Buenos Aires y la posible litigación recursiva en materia de Habeas Corpus (por agravamiento de las condiciones de detención) y Medidas de Coerción Personal (plazos irrazonables de la prisión preventiva). Seudónimo: June El Tribunal de Casación Penal de la provincia de Buenos Aires y la problemática referida a la tramitación de cuestiones relacionadas con el agravamiento de las condiciones de detenc...

  8. Tipo de parideras y productividad de las cerdas y sus camadas en un sistema de producción porcina al aire libre Farrowing type facilities and sow and litter productivity in an outdoor pig production system

    Directory of Open Access Journals (Sweden)

    A Echevarría

    2005-12-01

    Full Text Available Se compararon tres tipos de parideras y dos épocas de parto de las cerdas en un establecimiento porcino al aire libre. Los tipos de parideras fueron: FA: Parideras de frente abierto de mampostería; AR: Parideras de campo tipo arco; UNRC: Parideras de campo mejoradas, diseño U.N.R.C. Las variables registradas fueron: Lechones nacidos vivos (NLeNV; Lechones destetados (NLeD; Peso promedio (Kg de los lechones al destete (PLeD; Lechones muertos nacimiento - destete (NLeMN-D; Porcentaje de mortalidad de lechones nacimiento - destete (%MLeN-D; Número ordinal de partos para cada cerda (NOP. Las épocas de parto fueron Otoño - Invierno (O-I y Primavera - Verano (P-V. Las condiciones de manejo y alimentación fueron similares para todos los tipos de parideras. Cada cerda y su camada constituyeron una repetición, las que se acumularon en el tiempo con cerdas de un mismo origen genético, asignadas al azar a cada tratamiento. La interacción Tipo de Parideras x EP no fue significativa (p = 0,89. El %MLeN-D y NLeMN-D fue menor en la paridera UNRC (p 0,05 entre los dos tipos de parideras de campo. El PLeD fue mayor (p Three farrowing facility types and two farrowing seasons were compared. The farrowing facility types were: FA: Open front farrowing accommodation with masonry walls and concrete floors; AR: Farrowing arc huts, in number of eight; UNRC: Improved farrowing huts. The following variables were registered: Piglets born alive (NLeNV; Piglets weaned (NLeD; Average (Kg. weaning weight (PLeD; Number of piglets died between farrowing and weaning (NLeMN-D; Piglet's mortality in percentage (%MLeN-D; Sows parities numbers (NOP. Feeding and management were similar for all treatments. Each sow and her litter were taken as a replication, which were accumulated over time, with sows of the same genetic origin assigned at random to each farrowing accommodation type. Farrowing season (EP were: Autumn - Winter (A-W and Spring - Summer (S - S. The interaction

  9. El análisis de impacto presupuestario en salud: puesta al día con un modelo de abordaje genérico Budgetary impact analysis in health: update with a model using a generic approach

    Directory of Open Access Journals (Sweden)

    Osvaldo Ulises Garay

    2011-09-01

    Full Text Available El Análisis de Impacto Presupuestario (AIP en el campo de la salud puede ser definido como la estimación de los costos financieros netos que le representarían a una institución dar cobertura a una determinada intervención. En la práctica, los AIP se utilizan frecuentemente para decidir la inclusión o exclusión de medicamentos en formularios terapéuticos y notoriamente han obligado a reconocer que las Evaluaciones Económicas representan una mirada parcial en el análisis de las consecuencias de la incorporación de tecnologías sanitarias. Este trabajo procura identificar los determinantes y componentes de los análisis de impacto presupuestario, y a partir de ello describir el desarrollo de un modelo creado en una planilla de cálculo que permite considerar cualquier tecnología sanitaria y obtener estimaciones con diferentes grados de complejidad. Su diseño incorpora de forma explícita las habilidades del usuario y las deficiencias de información, buscando a su vez promover el desarrollo de estas herramientas en los ámbitos de gestión de nuestros países.Budgetary Impact Analysis (BIA applied to health care can be defined as the estimate of the net financial costs that a given intervention would represent for a health care institution given the case it was covered. Routinely, BIAs are used to decide the inclusion or exclusion of drugs in therapeutic schemes; actually, the increased use of BIAs have raised awareness about the fact that health economic evaluations represent a partial view in the analysis of the consequences of incorporating health technologies. This paper seeks to identify the determinants and components of BIA, and to describe the development of a spreadsheet model that enables us to assess the Budget impact of any health technology and perform estimations with differing degrees of complexity. Its design explicitly adapts to the user skills and gaps in information, thus seeking to promote the development of these tools in the management fields in our countries.

  10. Puesta en práctica de una política de desastres: los instrumentos de la gestión de riesgos en México

    OpenAIRE

    Estrada Díaz, Gabriela

    2015-01-01

    El programa de la política de desastres en México es revisado bajo la premisa de que ha resultado insuficiente para prevenir, de manera efectiva, la ocurrencia de desastres. La política mexicana de desastres se basa en una serie de instrumentos que inciden en los distintos momentos del desastre (de la etapa de riesgo al posdesastre), aunque hasta ahora se ha privilegiado la atención de emergencias y no se ha dado suficiente fuerza a los instrumentos y prácticas que podrían conducir a una polí...

  11. Estudio de prefactibilidad para la creación y puesta en marcha de una empresa operadora de turismo de naturaleza en Urabá

    OpenAIRE

    Gallego Moscoso, Laura; Lizcano Alonso, Adriana del Pilar; Muñoz Zuluaga, Paula Andrea

    2013-01-01

    El Gobierno Nacional tiene clara su apuesta en materia de turismo: sofisticación de la oferta, teniendo como pilar la biodiversidad que cada año atrae miles de turistas que disfrutan de los paisajes y practican actividades en las que la naturaleza es la protagonista -- Al contexto nacional se suma la visión del Gobierno del departamento de Antioquia, plasmada en su Plan de Desarrollo Turístico, que de igual manera se enfoca en el turismo especializado -- Esto constituye una oportunidad estra...

  12. Aspectos educativos de las redes sociales: un análisis de los factores que determinan su puesta en práctica

    OpenAIRE

    Morales Pérez, Gloria Luisa

    2016-01-01

    Considerando el papel fundamental de las TICs en la formación de la persona, capacitada para desenvolverse en la sociedad actual, y más concretamente la integración de las denominadas herramientas 2.0 al contexto cotidiano comunicativo y de las relaciones personales en la actualidad, parece impensable que la formación de estas personas no cuente con las herramientas apropiadas para que puedan entrenar las capacidades y competencias que posteriormente deberá ejercer de forma habitual. Las ...

  13. Un repaso por el origen y una mirada puesta en el presente. ¿Qué tiene para ofrecernos el periodismo digital?

    OpenAIRE

    Lic. Mónica Tejera Cruz

    2002-01-01

    El fenómeno de Internet no pasa inadvertido a ningún mortal. Mucho menos cuando se dedican al mundo de la comunicación. Para los periodistas, la aparición de la Red y el desarrollo de la Word Wide Web ha venido a coquetear con su ansia de comunicar, informar, expresar; a fin de cuentas, transmitir mensajes. El desarrollo de la tecnología ha puesto en bandeja de plata un nuevo soporte que permite llegar a las personas a través de los ordenadores y abre un universo de posibilidades para explota...

  14. Sobre la puesta, incubación de huevos, nacimiento y desarrollo de crías de Philodryas viridissima (Colubridae: Xenodontinae) en cautiverio

    OpenAIRE

    Rivera, Daniela S.; Aguayo, Rodrigo; Alfaro, Fernando D.

    2009-01-01

    El género Philodryas (Wagler, 1830) incluye aproximadamente 21 especies distribuidas en casi toda Sudamérica. Existen reportes sobre la dieta, hábitat y tácticas defensivas de muchas especies del género (Bozinovic y Rosenman, 1988; Marques, 1999; Hartmann y Marques, 2005), pero los datos reproductivos se restringen a pocas especies. El día 10 de noviembre del 2005 se capturó una hembra de Philodryas viridissima oviponiendo en un hormiguero al lado de un sendero en la Reserva privada de Potrer...

  15. Objetivo: Autocupación 2.0 : Conceptualización, diseño y puesta en marcha de una iniciativa empresarial basada en el desarrollo y diseño web, apps, los contenidos digitales y el marketing online

    OpenAIRE

    Montesinos de la Fuente, Ángeles

    2014-01-01

    Creación y puesta en marcha de un negocio basado en el desarrollo y diseño web, apps, los contenidos digitales y el márquetin online. Master thesis for the Multimedia program. Creació i posada en marxa d'un negoci basat en el desenvolupament i disseny web, apps, els continguts digitals i el màrqueting en línia.

  16. Cooperación al desarrollo : transferencia de tecnología eólica en la fabricación de micro-aerogeneradores mediante tecnologías apropiadas en regiones rurales andinas del Perú

    OpenAIRE

    Lucas Cabañas, Gerardo de

    2010-01-01

    El presente documento ilustra el proceso de elaboración de aerogeneradores de baja potencia para electrificación en instalaciones aisladas. El proyecto de cooperación al desarrollo para la transferencia de tecnología de fabricación y puesta en marcha, se ha llevado a cabo bajo las especificaciones técnicas requeridas para obtener un correcto funcionamiento en las regiones andinas del Perú. Alcanzar estas metas ha supuesto un reto en el diseño de los parámetros constructivos de la máquina eléc...

  17. La formación del personal docente e investigador de las universidades españolas públicas conforme al Espacio Europeo de Educación Superior

    OpenAIRE

    Liñán García, Ángeles

    2014-01-01

    La formación del personal docente e investigador de las universidades españolas conforme al Espacio Europeo de Educación Superior. RESUMEN: La implementación del Espacio Europeo de Educación Superior ha supuesto la puesta en marcha de un mecanismo orientado a fomentar la convergencia y armonización de los distintos sistemas nacionales de Educación Superior Europeos universitarios. Por ello, en este dinámico proceso en el que la institución universitaria está obligada a buscar como objetivo...

  18. Desarrollo y aplicación del diagnóstico y pronóstico técnico al mantenimiento de los sistemas centralizados de aire acondicionado. // Develop and application of diagnosis and technical prediction to maintenance of centralized air conditioned systems.

    Directory of Open Access Journals (Sweden)

    J. L. Sánchez Ávila

    2001-10-01

    Full Text Available Se expone la aplicación del mantenimiento por diagnóstico y pronóstico técnico al sistema centralizado de aireacondicionado con recuperación del calor del hotel LTI Bella Costa; como solución a los graves problemas a que seenfrenta la dirección de servicios técnicos de las instalaciones turísticas para realizar un mantenimiento con calidad y a unmenor costo. El desarrollo de un plan experimental, en las instalaciones del hotel, permitió obtener las curvas que expresanel comportamiento de la degradación de estos sistemas en el tiempo, así como determinar el momento más oportuno para larealización del mantenimiento.La aplicación de esta investigación permitió la implementación de un mantenimiento menoscostoso y de más calidad, aumentando la rentabilidad de la labor del mantenimiento, y lo que es decisivo en este tipo deinstalación: la seguridad en la explotación como garantía de un servicio sin fallas.Palabras claves: Mantenimiento, refrigeración, predictivo, diagnóstico, pronóstico.___________________________________________________________________Abstract:The application of maintenance by diagnosis and technical prediction to centralized system of conditioned air withrecovery of heat is exposed; as solution to the serious problems faces technical services of tourist facilities to carry outmaintenance with quality and smaller cost. The development of an experimental plan, in hotel facilities, allowed to obtaincurves that express the behavior of degradation of these systems in time, as well as to determine the most opportunemoment for the maintenance realization. Application of this investigation allowed the implementation of a less expensivemaintenance with more quality, increasing the profitability of maintenance work, and what is decisive in this type ofinstallation,: the security in the exploitation like guarantee of a service without flaws.Key words. Maintenance, refrigeration, prediction, diagnosis, air conditioned.

  19. La mirada de un prisionero. Fundamentos de hibridación teórico-prácticos para una puesta en escena

    OpenAIRE

    Yépez, Gabriel

    2014-01-01

    “La mirada de un prisionero” forma parte de una investigación en la que se reflexiona en torno a los sistemas de vigilancia carcelaria basados en el uso de la imagen electrónica y de video. La relevancia de la investigación radica en el análisis sobre los usos y posibilidades de la imagen en nuestra sociedad actual. Los principales temas que se abordan son los relacionados al poder de la imagen en la era de la comunicación visual, sus múltiples capacidades en la transmisión de mensajes y sus ...

  20. Puesta a punto del método de PCR en tiempo real para la cuantificación de Aspergillus carbonarius en uvas Vitis vinifera cv. Tannat

    Directory of Open Access Journals (Sweden)

    Gustavo Garmendia

    2011-12-01

    Full Text Available La ocratoxina A (OTA es una micotoxina que ha sido detectada en uvas y vinos. Es producida por Aspergillus ochraceus, Penicillium verrucosum, Aspergillus carbonarius y especies pertenecientes al agregado Aspergillus niger. En los últimos años se ha descrito la presencia de Aspergillus aculeatus y Aspergillus japonicus en la superficie de uvas y su capacidad de producir OTA. A pesar de que la concentración detectada de cepas pertenecientes a la Sección Nigri fue < 100/g de uva, se han aislado, identificado y caracterizado 56 cepas de Aspergillus pertenecientes a la Sección Nigri. El 51 % fue identificado como A. niger, el 39 % como A. japonicus, 5 % como A. tubingensis -like y 5 % como A. foetidus. Ninguna cepa de A. carbonarius fue aislada. Debido a que esta especie ha sido descrita como la principal responsable de la presencia de OTA en uvas y vinos por su capacidad de producir altas concentraciones de OTA, se requiere un método más sensible que los métodos convencionales para detectar y cuantificar la presencia de A. carbonarius en uva. En este trabajo se optimizó la técnica de PCR en tiempo real para la detección y cuantificación de esta especie en uvas d e la variedad Tannat.

  1. AL Amyloidosis

    Directory of Open Access Journals (Sweden)

    Desport Estelle

    2012-08-01

    Full Text Available Abstract Definition of the disease AL amyloidosis results from extra-cellular deposition of fibril-forming monoclonal immunoglobulin (Ig light chains (LC (most commonly of lambda isotype usually secreted by a small plasma cell clone. Most patients have evidence of isolated monoclonal gammopathy or smoldering myeloma, and the occurrence of AL amyloidosis in patients with symptomatic multiple myeloma or other B-cell lymphoproliferative disorders is unusual. The key event in the development of AL amyloidosis is the change in the secondary or tertiary structure of an abnormal monoclonal LC, which results in instable conformation. This conformational change is responsible for abnormal folding of the LC, rich in β leaves, which assemble into monomers that stack together to form amyloid fibrils. Epidemiology AL amyloidosis is the most common type of systemic amyloidois in developed countries with an estimated incidence of 9 cases/million inhabitant/year. The average age of diagnosed patients is 65 years and less than 10% of patients are under 50. Clinical description The clinical presentation is protean, because of the wide number of tissues or organs that may be affected. The most common presenting symptoms are asthenia and dyspnoea, which are poorly specific and may account for delayed diagnosis. Renal manifestations are the most frequent, affecting two thirds of patients at presentation. They are characterized by heavy proteinuria, with nephrotic syndrome and impaired renal function in half of the patients. Heart involvement, which is present at diagnosis in more than 50% of patients, leading to restrictive cardiopathy, is the most serious complication and engages prognosis. Diagnostic methods The diagnosis relies on pathological examination of an involved site showing Congo red-positive amyloid deposits, with typical apple-green birefringence under polarized light, that stain positive with an anti-LC antibody by immunohistochemistry and

  2. Puesta en evidencia del virus diarrea viral bovina en bovinos clínicamente afectados Isolation of the bovine viral diarrhoea virus from tissue of clinically affected cattle

    Directory of Open Access Journals (Sweden)

    M.O CELEDON

    1997-01-01

    Full Text Available Para conocer la presencia del virus diarrea viral bovina (VDVB en animales sospechosos de estar cursando un cuadro clínico provocado por este virus, se trabajó con un total de 33 animales, correspondiendo a 23 fetos abortados, 2 mortinatos, un nonato, 3 vacas: una madre de mortinato, una madre de aborto y una muerta, 2 novillos muertos y 2 terneros muertos. Muestras de órganos se inocularon en cultivos primarios de pulmón fetal bovino (PFB y en la línea MDBK. Después del primer pasaje en células de PFB, se detectó la presencia de antígenos del VDVB por la prueba de inmunoperoxidasa indirecta (IPI. Todas las muestras con reacción positiva a IPI se inocularon por segunda y tercera vez en células de PFB, aplicándose la prueba de IPI en el tercer pasaje. Sobre un cuarto pasaje se aplicó la prueba de inmunofluorescencia direccta (IFD. Todas las muestras, positivas y negativas a IPI, se inocularon en 3 pasajes seriados en las células MDBK. En 23 de los 33 animales se aisló VDVB cepas no citopatogénicas (NCP, correspondiendo a 14 fetos abortados, un nonato, un mortinato, 3 vacas, 2 novillos y 2 terneros. En 6 fetos abortados, independiente de los infectados con el VDVB, se aisló el virus de la rinotraqueítis infecciosa bovina (RIB. Se concluye que la presencia del VDVB es de alta frecuencia en muestras clínicas de ganado bovino con patologías asociables al VDVB, desconociéndose el rol patógeno del virus en estos aislados.Cattle infected with the bovine viral diarrhoea (BVD virus can present a variety of clinical signs. This research studied the presence of BVD virus in cattle by virus isolation in primary cell cultures of bovine embryo lungs. Virus identification was done using the immunoperoxidase staining assay and the direct fluorescent antibody staining. As a result, 23 out of 33 animals were identified as positive to BVD virus: 14 foetal abortions, 2 stillbirths, 3 dams, 2 steers and 2 calves. No cytopathogenic isolates were

  3. Puesta a punto del método de extracción por diálisis difásica para el análisis de triazinas en leches maternizadas

    Directory of Open Access Journals (Sweden)

    M. Santaeufemia

    2005-01-01

    Full Text Available Las triazinas son uno de los grupos de herbicidas más frecuentemente utilizados en las labores agrícolas. Habitualmente su extracción se realiza mediante métodos líquidolíquido. El objetivo de este trabajo fue la puesta a punto del método de extracción de la diálisis difásica para análisis de las triazinas en leches maternizadas. Para ello se utilizó un agitador orbital y membranas de diálisis visking 20/32“, llegando a establecerse como condiciones ideales: temperatura, 34 ºC; velocidad de agitación, 200 rpm; disolvente de extracción, diclorometano, y tiempo de extracción, 4 h. La identificación de los herbicidas y la validación del método analítico siguiendo la normativa vigente se realizó utilizando un cromatógrafo de gases con detector de nitrógeno-fósforo. Los tiempos de retención y las recuperaciones obtenidas para cada una de las triazinas fueron: simazina 16,95 min y 75,3 %; atrazina 17,18 min y 116 % y terbutilazina 17,75 min y 88,7 %, respectivamente. A partir de los resultados obtenidos se puede concluir que es un buen método de extracción para el análisis de estos posibles contaminantes en leches maternizadas.

  4. Compressed air energy storage power plants as an option for the grid integration of renewable energy sources. A comparison of the concepts; Druckluftspeicherkraftwerke als Option zur Netzintegration erneuerbarer Energiequellen. Ein Vergleich der Konzepte

    Energy Technology Data Exchange (ETDEWEB)

    Tuschy, Ilja [Fachhochschule Flensburg (Germany). Inst. fuer Energiesystemtechnik

    2008-07-01

    The integration of an increasing amount of power generation from renewable energy sources is a large challenge for the electricity supply. Apart from the compensation of varying production by supra-regional grids and apart from the further development of peak load power stations the energy storage is discussed as an option. Several power suppliers referred to compressed air energy storage plants as a possible solution. The authors of the contribution under consideration compare the different concepts for compressed air energy power stations systematically. A special emphasis is the thermodynamic evaluation of the different concepts. Also energy-technical aspects are addressed which decide on possibilities of application and perspectives of development for compressed air energy power stations.

  5. Puesta a prueba de un indicador sencillo de degradación en suelos histeréticos del Valle del Cauca, Colombia

    Directory of Open Access Journals (Sweden)

    Lozano Jaime

    2005-06-01

    Full Text Available En el 2001 se llevó a cabo el estudio en cinco suelos de los órdenes vertisol y molisol del CIAT, utilizando una malla anidada georreferenciada de 68 puntos de muestreo ubicados en esquema logarítmico a dos profundidades: en la superficie y en la zona de menor penetrabilidad. Esta fue la base para hacer la cartografía de un índice de compactación y de las principales propiedades físicas de los suelos. El índice de compactación se estimó combinando la densidad aparente y la humedad gravimétrica de muestreo utilizando una matriz de relación ideada para este fin. Se evaluaron cuatro categorías de características físicas: propiedades hídricas (conductividad hidráulica, tasa de infiltración, sortividad y tasa de redistribución de humedad volumétrica usando el método del “perfil instantáneoâ€?, capacidad de retención a través de la curva característica; condición estructural mediante el método de “Yoderâ€? modificado y condición física general (textura, densidades, materia orgánica, penetrabilidad y distribución de poros. Para validar el índice de compactación se siguieron tres vías: comportamiento de las categorías de propiedades físicas en cada unidad homogénea del mapa de compactación o consistencia (análisis de geoestadística y de correlación por componentes principales; estudio gráfico de la tendencia de las curvas de redistribución del agua en el suelo, y análisis multivariado discriminante con el fin de comprobar la viabilidad de convertir al índice de compactación en una docena de clases por consistencia. El índice propuesto probó ser buen indicador ya que en las unidades con compactación decrecieron las cualidades físicas evaluadas. Palabras claves: Ándice de compactación, propiedades hídricas del suelo, condición estructural, capacidad de retención de humedad, geoestadística, suelos histeréticos. ABSTRACT Testing a simple soil degradation indicator in

  6. INTRODUCCIÓN AL MÉTODO CIENTÍFICO EN NIÑOS DE CINCO AÑOS

    OpenAIRE

    Soler-López, Elena

    2013-01-01

    Este trabajo pretende introducir a los niños de cinco años en el método científico como proceso que favorece la adquisición y desarrollo de capacidades, habilidades y competencias en los alumnos, estimulando un desarrollo integral de la persona a nivel físico, cognitivo, emocional y social. Para ello, el diseño de la propuesta ha abarcado desde una fundamentación teórica hasta la puesta en práctica de la misma. Este diseño, realizado a través de las fases del método aplicadas al estudio de...

  7. Diseño de un programa de prácticas adaptadas al EEES para asignaturas del módulo de dirección de recursos humanos del Grado en Relaciones Laborales y Recursos Humanos de la Universidad de Salamanca

    OpenAIRE

    González Fernández, Luis; Elena y Peña, Joaquín de

    2011-01-01

    Este proyecto pretende aunar las nuevas fórmulas de enseñanza-aprendizaje con las TICs, para la optimización del entrenamiento práctico del alumnado del nuevo Grado en Relaciones Laborales y Recursos Humanos, en dos asignaturas correspondientes al Módulo de Dirección y Gestión de Recursos Humanos: "Introducción a la Dirección de Recursos Humanos" (1º) y "Psicología del Trabajo y las Organizaciones" (2º). Se trata del diseño, desarrollo y puesta en marcha de un pack modular de recursos, medios...

  8. Innovative conditioning of groundwater as a prerequisite for an efficient air-conditioning of buildings by means of near-surface geothermal energy; Innovative Grundwasseraufbereitung als Voraussetzung fuer eine effiziente Gebaeudeklimatisierung durch die Nutzung oberflaechennaher Geothermie

    Energy Technology Data Exchange (ETDEWEB)

    Meyer, C.; Krauss, M.; Steinmetz, H. [Stuttgart Univ. (Germany). Inst. fuer Siedlungswasserbau-, Wasserguete- und Abfallwirtschaft; Edel, H.G.; Kellner, C. [Zueblin Umwelttechnik GmbH (Germany)

    2012-10-16

    The air-conditioning of buildings increasingly requires alternatives to cover the energy demand from renewable energy sources. One possibility consists of the utilization of a heat pump fed with ground water. Due to the local hydrogeochemical realities, groundwater however contains large amounts of solved iron and manganese resulting in operational problems (depositions) in plant sections. Without a previous conditioning, such waters cannot be utilized. Under this aspect, the authors of the contribution under consideration report on the technology of an in-situ conditioning of groundwater as an innovative conditioning process to remove iron and manganese enabling an efficient air-conditioning of buildings by utilizing sub-surface geothermal energy (groundwater). The process is characterized by numerous advantages such as the absence of residues from processing residues compared with conventional conditioning procedures. Beside the description of the procedure, plant engineering as well as the planning fundamentals, the authors of the contribution under consideration present the in-situ-conditioning of groundwater for the air-conditioning of the buildings of the Berufsakademie Hohenheim (Baden-Wueerttemberg, Federal Republic of Germany) as a case study.

  9. Thin air

    OpenAIRE

    Jasanoff, Sheila

    2013-01-01

    Clearing the air How do we grasp the air? Without Michel Callon’s guidance, I might never have asked that question. Years ago, when I first entered environmental law practice, I took it for granted that problems such as air pollution exist “out there” in the real world for science to discover and law to fix. It is a measure of Callon’s influence that I understand the law today as a metaphysical instrument, no less powerful in its capacity to order nature than the tools of the ancient oracular...

  10. Effects of Oxidants on Combustion Performances of Al/H2O Based Fuels in Air%空气条件下氧化剂对铝/水基燃料燃烧特性的影响

    Institute of Scientific and Technical Information of China (English)

    林振坤; 韩咚林; 王天放; 赵凤起; 仪建华; 李疏芬

    2010-01-01

    利用多种实验技术研究了在空气气氛中添加剂奥克托今(HMX)和六硝基六氮杂异伍兹烷(CL-20)对Al/H2O基燃料燃烧特性的影响.实验发现添加HMX比CL-20更有利于铝粉的燃烧,对燃面温度的提高效果也更为显著,但是,添加CL-20能促进Al/H2O基燃料的热量传递,显著提高燃速.通过分析发现,实验结果与氧化剂CL-20和HMX本身的热分解和燃烧特性紧密相关.

  11. Air Traffic Flow Management

    CERN Document Server

    Ganu, Hrishikesh V

    2008-01-01

    Air Traffic Flow Management is the regulation of air traffic in order to avoid exceeding airport or flight sector capacity in handling traffic, and to ensure that available capacity is used efficiently. We have tried to explore the logic behind the claims by Bertsimas et.al about integral solutions to the LP relaxation of the Traffic Flow Management Problem(TFMP). Polyhedral theory only indicates that the stronger TFMP formulation of Bertsimas et.al might lead to integral solutions in some cases. Our computations indicate that the encouraging results reported by Bertsimas et.al are not merely fortuitous or due to their specific data set. Indeed, we found that the TFMP had integral solutions even in case of artificial data sets generated to include severe conflicts in the flight schedules. In our limited tests with 4-5 scenarios, we obtained non-integral solutions only once. This is of significant practical importance because, the LP relaxation can be solved even on small machines with low memory and processor...

  12. Air Pollution

    Science.gov (United States)

    ... to a close in June 2013 when the company, Conscious Clothing, was awarded the My Air grand ... Page Options: Request Translation Services Facebook Twitter LinkedIn Google+ Reddit Email Evernote More Increase Font Size Decrease ...

  13. 空调压缩机铝合金连杆的液态模锻%Hydraulic Forging of the Al Alloy Connection Rod of the Air-Conditioner Compressor

    Institute of Scientific and Technical Information of China (English)

    屈华昌

    2001-01-01

    分析了空调压缩机用铝合金连杆的工艺特点和技术要求,介绍了液态模锻的模具结构和工作过程,同时还介绍了铝合金连杆液态模锻的工艺参数。%The processing characteristics and the technical requirement of the aluminum alloy connection rod for the air-conditioner compressor were analyzed. The structure and working process of the hydraulic forging die were introduced. And the processing data for hydraulically forging the aluminum alloy connection rod were stated.

  14. Metal hydride air conditioner

    Institute of Scientific and Technical Information of China (English)

    YANG; Ke; DU; Ping; LU; Man-qi

    2005-01-01

    The relationship among the hydrogen storage properties, cycling characteristics and thermal parameters of the metal hydride air conditioning systems was investigated. Based on a new alloy selection model, three pairs of hydrogen storage alloys, LaNi4.4 Mn0.26 Al0.34 / La0.6 Nd0.4 Ni4.8 Mn0.2 Cu0. 1, LaNi4.61Mn0. 26 Al0.13/La0.6 Nd0.4 Ni4.8 Mn0.2 Cu0. 1 and LaNi4.61 Mn0.26 Al0.13/La0.6 Y0.4 Ni4.8 Mn0. 2, were selected as the working materials for the metal hydride air conditioning system. Studies on the factors affecting the COP of the system showed that higher COP and available hydrogen content need the proper operating temperature and cycling time,large hydrogen storage capacity, flat plateau and small hysterisis of hydrogen alloys, proper original input hydrogen content and mass ratio of the pair of alloys. It also needs small conditioning system was established by using LaNi4.61 Mn0.26 Al0. 13/La0.6 Y0.4 Ni4.8 Mn0.2 alloys as the working materials, which showed that under the operating temperature of 180℃/40℃, a low temperature of 13℃ was reached, with COP =0.38 and Wnet =0.09 kW/kg.

  15. Air surveillance

    Energy Technology Data Exchange (ETDEWEB)

    Patton, G.W.

    1995-06-01

    This section of the 1994 Hanford Site Environmental Report summarizes the air surveillance and monitoring programs currently in operation at that Hanford Site. Atmospheric releases of pollutants from Hanford to the surrounding region are a potential source of human exposure. For that reason, both radioactive and nonradioactive materials in air are monitored at a number of locations. The influence of Hanford emissions on local radionuclide concentrations was evaluated by comparing concentrations measured at distant locations within the region to concentrations measured at the Site perimeter. This section discusses sample collection, analytical methods, and the results of the Hanford air surveillance program. A complete listing of all analytical results summarized in this section is reported separately by Bisping (1995).

  16. Adaptaciones de la fiscalidad a la economía rural en los inicios del período independiente. Estacionalidad productiva e impuestos al comercio en la campaña de Buenos Aires (1810-1840

    Directory of Open Access Journals (Sweden)

    Antonio Galarza

    2015-05-01

    Full Text Available El artículo versa acerca de las reformas fiscales de 1822 en la provincia de Buenos Aires, las cuales establecieron un calendario de pagos para los comercios rurales. A partir de la hipótesis de que la fecha estipulada en dicho calendario se correspondía con los momentos más álgidos de la práctica comercial en la campaña porteña, se indaga en la estacionalidad de las actividades productivas y comerciales en la campaña sur. Sobre la base del estudio de caso del partido de Chascomús, se analizan además las características de la recaudación de estos impuestos en las décadas de 1810, 1820 y 1830, a fin de identificar su posible vinculación con la estacionalidad del comercio.   The article concerns the tax reforms of 1822 in the province of Buenos Aires, which established a payments calendar for rural trade. From the hypothesis that the date specified in the calendar corresponds with the most critical moments of commercial practice in Buenos Aires’s countryside, I examine the seasonality of production and commercial activities in the southern hinterland. Based on the case study of Chascomús, this article also examines the characteristics of this collection of taxes in the 1810s, 1820s and 1830s to identify their possible relationship with the seasonality of trade.

  17. Farklı Çalışma Ortamlarında Oluşabilecek Hava Kirliliğinin Çalışanların Sağlığı Üzerindeki Etkileri / The Effects of Air Pollution on Workers’ Health In Different Work Places

    OpenAIRE

    Simge Taner; Utkan Özdemir

    2012-01-01

    Endüstriyel ve endüstriyel olmayan (okul, ofis, fotokopi merkezleri, restoran vb.) çalışma alanlarındaki hava kalitesi, çalışma ortamında bulunan personelin sadece konforu için değil, sağlığı için de büyük önem taşımaktadır. İç ortam hava kalitesi değerlendirmesi yapılırken genellikle sıcaklık, nem oranı, hava akım hızı, kükürtdioksit (SO2), karbondioksit (CO2), solunabilinir asılı partikül madde (PM), hidrojen sülfür (H2S), uçucu organik bileşikler (VOC), azot oksitler (NOx), karbonmonoksit ...

  18. Synthesis of a novel Pd/Al2O3 catalyst for Ventilation Air Methane combustion with excellent catalytic activity in low temperatures%煤矿乏风甲烷氧化新型Pd/Al2O3催化剂的合成

    Institute of Scientific and Technical Information of China (English)

    刘文革; 郭德勇; 徐鑫

    2012-01-01

    运用溶胶-凝胶法合成了同时具有介孔和三维交联通透型微米级大孔的Al2O3多孔材料,并以其为载体采用浸渍法制备得到一种新型的Pd/Al2O3整体式催化剂,考察了不同助剂Ce,Zr,La及不同的助剂负载量对甲烷催化燃烧活性的影响.实验结果表明,所合成的新型Pd/Al2O3催化剂具有良好的低温活性,在CH4体积百分数为1%,反应气体空速为6 000 h-1的实验条件下,Pd/Al2O3的起燃温度只有227 ℃,认为这主要是采用的Al2O3载体材料中存在的三维交联通透型微米级大孔骨架可以提供快速的传质通道,在骨架中存在的纳米级介孔能提供较大的表面积和单位容量,从而有利于提高活性组分的分散性及有效利用效率,提高催化剂的活性.助剂Zr的加入能够降低催化剂的起燃温度,而助剂Ce对催化剂活性的影响与其添加量有关.%Bimodal A12O3 porous material with both mesopores and three-dimensional interconnected macropores in micrometer-scale was synthesized via sol-gel method. A kind of novel Pd/Al2O3 monolithic catalysts were prepared by impregnation using the as-synthesized A12O3 porous material as the support. Influence of different additives of Ce,Zr, La and different load amount of the additives on methane combustion activity were investigated. The experimental results show that the new synthesized Pd/Al2O3 catalyst has good low temperature activity. Under the experimental conditions of 1%CH4 with reaction gas space velocity of 6 000 h"1 ,the ignition temperature of Pd/Al2O3 is only 227 t. It is considered that the three-dimensional interconnected macropores of A12O3 support can provide fast mass transfer channel;while the nanoscale mesopores in the skeleton can provide large surface area and unit volume,and thus help to increase the catalytic activity by improving the dispersion of the active component and use efficiency. Additives of Zr can reduce the ignition temperature of the catalyst; the

  19. Healthy Air Outdoors

    Science.gov (United States)

    ... lung.org > Our Initiatives > Healthy Air > Outdoor Healthy Air Outdoors The quality of the air we breathe ... families and can even shorten their lives. Outdoor Air Pollution and Health Outdoor air pollution continues to ...

  20. Oxidation Behaviour of Sputtered Ni-3Cr-20Al Alloy

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    The oxidation behavior of sputtered Ni-3Cr-20Al coating at 900°C in air was investigated. A dense Al2O3 layer was formed on the sputtered Ni-3Cr-20Al coating after 200 h oxidation.However, owing to the segregation of Ni3Al during oxidation Focess at high temperature, the spinel NiAl2O4 was also formed in the Al2O3 layer. It was found that the formation of NiAl2O4had no detrimental effect on the oxidation resistance of the sputtered Ni-3Cr-20Al coating due to the excellent adhesion shown by the Al2O3 and NiAl2O4 complex oxide scale.

  1. Armaflex in Burj al Arab; Armaflex im Burj al Arab

    Energy Technology Data Exchange (ETDEWEB)

    Steiner, B.

    2003-07-01

    This article describes the Burj al Arab in Dubai, the unique seven-star high-rise hotel. The construction of the hotel, that is built on 250 piles driven into the sand of an artificial island in the Persian Gulf, is described. In particular, various special materials used in the building are described, as are the luxurious fittings and furnishings of the hotel. The cooling and air-conditioning installations that are necessary as a result of the desert climate of Dubai are described and the use of 'Armaflex' elastomer insulating material for the insulation of refrigeration machines and cold-water piping is discussed.

  2. EN EL AIRE / In the air

    Directory of Open Access Journals (Sweden)

    Andrés López Fernández

    2011-11-01

    Full Text Available RESUMEN En el aire es un viaje a la primera mitad del siglo XX que nos tratará de acercar la frescura y oportunidad de las calles corredor y los jardines en la ciudad vertical. Se inicia en 1909 en Nueva York, con la publicación por la revista Life de La Torre del Globo, se acerca al Inmueble-Villas y al Plan Obus para Argel de Le Corbusier, y finaliza en 1952 con el proyecto para el conjunto residencial de Golden Lane en Londres de A. y P. Smithson. Fragmentos para la ciudad vertical que se construía sobre papel, tras el espejo, paralela en el tiempo, pero muy distinta a la ciudad real, con el objetivo entre otros de integrar arquitectura y naturaleza. Esas propuestas siguen teniendo hoy un gran valor, en un panorama en que el espacio público ligado a la vivienda colectiva, prácticamente ha desaparecido, y el esfuerzo que se demanda al arquitecto se centra, en tejer a modo de encaje de bolillos, una fachada que envuelva un programa de vivienda, funcional y espacialmente obsoleto.SUMMARY In the air, is a journey to the first half of the twentieth century that will try to bring us to the freshness and opportunity of the corridor streets and gardens in the vertical city. It begins in 1909 in New York, with the publication in Life magazine of the Globe Tower, it approaches the Immeubles-Villas and Plan Obus for Algiers by Le Corbusier, and ends in 1952 with the project for the Golden Lane Estate residential complex in London, by A. and P. Smithson. Fragments for the vertical city that was constructed on paper, behind the mirror, parallel in time, but was very different from the real city, with the aim, inter alia, of integrating architecture and nature. These proposals continue to have great value today, in a scenario where the public space linked to the collective home has virtually disappeared, and the effort that is demanded of the architect focuses on weaving a facade like bobbin lace around a functionally and spatially obsolete housing

  3. Royal Danish Air Force. Air Operations Doctrine

    DEFF Research Database (Denmark)

    Nørby, Søren

    This brief examines the development of the first Danish Air Force Air Operations Doctrine, which was officially commissioned in October 1997 and remained in effect until 2010. The development of a Danish air power doctrine was heavily influenced by the work of Colonel John Warden (USAF), both...... through his book ”The Air Campaign” and his subsequent planning of the air campaign against Iraq in 1990-1991. Warden’s ideas came to Denmark and the Danish Air Force by way of Danish Air Force students attending the United States Air Force Air University in Alabama, USA. Back in Denmark, graduates from...... the Air University inspired a small number of passionate airmen, who then wrote the Danish Air Operations Doctrine. The process was supported by the Air Force Tactical Command, which found that the work dovetailed perfectly with the transformation process that the Danish Air Force was in the midst...

  4. AlN/IDT/AlN/Sapphire SAW Heterostructure for High-Temperature Applications.

    Science.gov (United States)

    Legrani, Ouarda; Aubert, Thierry; Elmazria, Omar; Bartasyte, Ausrine; Nicolay, Pascal; Talbi, Abdelkrim; Boulet, Pascal; Ghanbaja, Jaafar; Mangin, Denis

    2016-06-01

    Recent studies have evidenced that Pt/AlN/Sapphire surface acoustic wave (SAW) devices are promising for high-temperature high-frequency applications. However, they cannot be used above 700°C in air atmosphere as the Pt interdigital transducers (IDTs) agglomerate and the AlN layer oxidizes in such conditions. In this paper, we explore the possibility to use an AlN protective overlayer to concurrently hinder these phenomena. To do so, AlN/IDT/AlN/Sapphire heterostructures undergo successive annealing steps from 800°C to 1000°C in air atmosphere. The impact of each step on the morphology, microstructure, and phase composition of AlN and Pt films is evaluated using optical microscopy, scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction (XRD), and secondary ion mass spectroscopy (SIMS). Finally, acoustical performance at room temperature of both protected and unprotected SAW devices are compared, as well as the effects of annealing on these performance. These investigations show that the use of an overlayer is one possible solution to strongly hinder the Pt IDTs agglomeration up to 1000°C. Moreover, AlN/IDT/AlN/Sapphire SAW heterostructures show promising performances in terms of stability up to 800°C. At higher temperatures, the oxidation of AlN is more intense and makes it inappropriate to be used as a protective layer. PMID:27076407

  5. Description of Microvirga aerophila sp. nov. and Microvirga aerilata sp. nov., isolated from air, reclassification of Balneimonas flocculans Takeda et al. 2004 as Microvirga flocculans comb. nov. and emended description of the genus Microvirga.

    Science.gov (United States)

    Weon, Hang-Yeon; Kwon, Soon-Wo; Son, Jung-A; Jo, Eun-Hye; Kim, Soo-Jin; Kim, Yi-Seul; Kim, Byung-Yong; Ka, Jong-Ok

    2010-11-01

    Two bacterial strains, 5420S-12(T) and 5420S-16(T), isolated from air samples, were characterized using a polyphasic approach. 16S rRNA gene sequence analysis showed that strain 5420S-12(T) was related phylogenetically to Microvirga subterranea FaiI4(T) (97.4 % sequence similarity) and Microvirga guangxiensis 25B(T) (97.1 %) and that strain 5420S-16(T) was closely related to Balneimonas flocculans TFB(T) (98.0 %) and Microvirga guangxiensis 25B(T) (97.2 %). The G+C content of the genomic DNA was 62.2 mol% for strain 5420S-12(T) and 61.5 mol% for strain 5420S-16(T). The major fatty acid was C(18 : 1)ω7c. The results of DNA-DNA hybridization and the phenotypic data showed that strains 5420S-12(T) and 5420S-16(T) could be distinguished from phylogenetically related species and represent two novel species within the genus Microvirga, for which the names Microvirga aerophila sp. nov. (type strain 5420S-12(T) =KACC 12743(T) =NBRC 106136(T)) and Microvirga aerilata sp. nov. (type strain 5420S-16(T) =KACC 12744(T) =NBRC 106137(T)) are proposed. Furthermore, the reclassification of Balneimonas flocculans as Microvirga flocculans comb. nov. (type strain TFB(T) =JCM 11936(T) =KCTC 12101(T) =IAM 15034(T) =ATCC BAA-817(T)) is proposed and an emended description of the genus Microvirga is provided. PMID:20023055

  6. Summary Day 1: Second AirMonTech Workshop, Current and Future Air Quality Monitoring

    OpenAIRE

    Querol, Xavier

    2012-01-01

    Presentación resumen de las ponencias del primer día de las Second AirMonTech Workshop, Current and Future Air Quality Monitoring. Estas jornadas tuvieron lugar en Barcelona del 25 al 26 de abril de 2012.

  7. High temperature creep behaviour of Al-rich Ti-Al alloys

    Energy Technology Data Exchange (ETDEWEB)

    Sturm, D; Heilmaier, M; Saage, H [Otto von Guericke University Magdeburg, Institute for Materials and Joining Technology, PO Box 4120, D-39016 Magdeburg (Germany); Aguilar, J; Schmitz, G J; Drevermann, A [ACCESS e.V., Intzestrasse 5, D-52072 Aachen (Germany); Palm, M; Stein, F; Engberding, N [Max-Planck-Institut fuer Eisenforschung GmbH, Max-Planck-Str. 1, D-40237 Duesseldorf (Germany); Kelm, K; Irsen, S, E-mail: daniel.sturm@ovgu.d [Stiftung caesar, Electron Microscopy, Ludwig-Erhard-Allee 2, D-53175 Bonn (Germany)

    2010-07-01

    Compared to Ti-rich {gamma}-TiAl-based alloys Al-rich Ti-Al alloys offer an additional reduction of in density and a better oxidation resistance which are both due to the increased Al content. Polycrystalline material was manufactured by centrifugal casting. Microstructural characterization was carried out employing light-optical, scanning and transmission electron microscopy and XRD analyses. The high temperature creep of two binary alloys, namely Al{sub 60}Ti{sub 40} and Al{sub 62}Ti{sub 38} was comparatively assessed with compression tests at constant true stress in a temperature range between 1173 and 1323 K in air. The alloys were tested in the cast condition (containing various amounts of the metastable phases Al{sub 5}Ti{sub 3} and h-Al{sub 2}Ti) and after annealing at 1223 K for 200 h which produced (thermodynamically stable) lamellar {gamma}-TiAl + r-Al{sub 2}Ti microstructures. In general, already the as-cast alloys exhibit a reasonable creep resistance at 1173 K. Compared with Al{sub 60}Ti{sub 40}, both, the as-cast and the annealed Al{sub 62}Ti{sub 38} alloy exhibit better creep resistance up to 1323 K which can be rationalized by the reduced lamella spacing. The assessment of creep tests conducted at identical stress levels and varying temperatures yielded apparent activation energies for creep of Q = 430 kJ/mol for the annealed Al{sub 60}Ti{sub 40} alloy and of Q = 383 kJ/mol for the annealed Al{sub 62}Ti{sub 38} material. The latter coincides well with that of Al diffusion in {gamma}-TiAl, whereas the former can be rationalized by the instability of the microstructure containing metastable phases.

  8. Air filtration and indoor air quality

    DEFF Research Database (Denmark)

    Bekö, Gabriel

    2006-01-01

    Demands for better indoor air quality are increasing, since we spend most of our time indoors and we are more and more aware of indoor air pollution. Field studies in different parts of the world have documented that high percentage of occupants in many offices and buildings find the indoor air...... decent ventilation and air cleaning/air filtration, high indoor air quality cannot be accomplished. The need for effective air filtration has increased with increasing evidence on the hazardous effects of fine particles. Moreover, the air contains gaseous pollutants, removal of which requires various air...... cleaning techniques. Supply air filter is one of the key components in the ventilation system. Studies have shown that used ventilation filters themselves can be a significant source of indoor air pollution with consequent impact on perceived air quality, sick building syndrome symptoms and performance...

  9. Carmody, Patricio Mateo. Buscando consensos al fin del mundo: hacia una política exterior Argentina con consensos (2015-2027) : Buenos Aires, Consejo Argentino para las Relaciones Internacionales (CARI), Buenos Aires, 2015, 237 páginas

    OpenAIRE

    Riva, Macarena

    2015-01-01

    Esta publicación es una continuación del trabajo “Política exterior al fin del mundo. Argentina, Brasil y Chile en el tiempo democrático (1983-2010)”, en el cual el autor analiza los niveles de consenso en materia de política exterior de estos tres países latinoamericanos, concluyendo que, mientras en Brasil y en Chile existe cierto grado de consenso, en Argentina hay “desacuerdos básicos” en su política internacional. Ante tal panorama, Carmody se plantea si es posible diseñar una política e...

  10. Melting, Processing, and Properties of Disordered Fe-Al and Fe-Al-C Based Alloys

    Science.gov (United States)

    Satya Prasad, V. V.; Khaple, Shivkumar; Baligidad, R. G.

    2014-09-01

    This article presents a part of the research work conducted in our laboratory to develop lightweight steels based on Fe-Al alloys containing 7 wt.% and 9 wt.% aluminum for construction of advanced lightweight ground transportation systems, such as automotive vehicles and heavy-haul truck, and for civil engineering construction, such as bridges, tunnels, and buildings. The melting and casting of sound, porosity-free ingots of Fe-Al-based alloys was accomplished by a newly developed cost-effective technique. The technique consists of using a special flux cover and proprietary charging schedule during air induction melting. These alloys were also produced using a vacuum induction melting (VIM) process for comparison purposes. The effect of aluminum (7 wt.% and 9 wt.%) on melting, processing, and properties of disordered solid solution Fe-Al alloys has been studied in detail. Fe-7 wt.% Al alloy could be produced using air induction melting with a flux cover with the properties comparable to the alloy produced through the VIM route. This material could be further processed through hot and cold working to produce sheets and thin foils. The cold-rolled and annealed sheet exhibited excellent room-temperature ductility. The role of carbon in Fe-7 wt.% Al alloys has also been examined. The results indicate that Fe-Al and Fe-Al-C alloys containing about 7 wt.% Al are potential lightweight steels.

  11. AirData

    Data.gov (United States)

    U.S. Environmental Protection Agency — The AirData site provides access to yearly summaries of United States air pollution data, taken from EPA's air pollution databases. AirData has information about...

  12. R9 Air Districts

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Region 9 Air Districts layer is a compilation of polygons representing the California Air Pollution Control and Air Quality Management Districts, Arizona Air...

  13. Hazardous Air Pollutants

    Science.gov (United States)

    ... Facebook Twitter Google+ Pinterest Contact Us Hazardous Air Pollutants Hazardous air pollutants are those known to cause ... protect against adverse environmental effects. About Hazardous Air Pollutants What are hazardous air pollutants? Health and Environmental ...

  14. California Air Basins

    Data.gov (United States)

    California Department of Resources — Air ResourcesCalifornia Air Resources BoardThe following datasets are from the California Air Resources Board: * arb_california_airbasins - California Air BasinsThe...

  15. Armar y vestir al ejército de la Nación: los artefactos militares del Fuerte General Paz (Carlos Casares, Buenos Aires en el marco de la construcción del Estado nacional y la guerra de frontera WEAPONS AND UNIFORMS FOR THE ARMY OF THE NATION: THE MILITARY ARTIFACTS FROM FORT GENERAL PAZ, CARLOS CASARES, BUENOS AIRES, IN THE CONTEXT OF THE CONSTRUCTION OF THE NATION STATE AND THE FRONTIER WAR

    Directory of Open Access Journals (Sweden)

    Juan Bautista Leoni

    2009-12-01

    Full Text Available En este trabajo se aborda el análisis del conjunto de artefactos militares (elementos de armas y uniformes del sitio arqueológico Fuerte General Paz, Carlos Casares, Buenos Aires, comandancia de la Frontera Oeste entre 1869 y 1877. Se utiliza un enfoque amplio que comprende tanto el análisis tipológico y funcional de los artefactos como la investigación de documentos escritos, incluyendo relatos testimoniales de la época, registros oficiales del gobierno y reglamentos militares vigentes. Al tratarse de una guarnición militar significativa por su tamaño y su rol en la estructura de la línea de frontera, el conjunto permite evaluar el proceso de construcción de un ejército nacional efectivo, una aspiración principal de los primeros gobiernos del estado nacional liberal que surgió a partir de 1862. El análisis de los artefactos provenientes del sitio muestra una gran variedad de armas en servicio y una aplicación por lo menos laxa de los reglamentos vigentes para uniformes, mostrando que la estandarización y regularización deseada por las autoridades estaba lejos de lograrse, y que necesariamente deben combinarse distintas fuentes de información para obtener mejores interpretaciones de los diversos aspectos de la vida en los emplazamientos militares de frontera.This paper analyzes the assemblage of military artifacts from Fort General Paz, Carlos Casares, Buenos Aires, headquarters of the so-called Western Frontier between 1869 and 1877. A broad approach is employed, including both the typological and functional analysis of the artifacts and the examination of the documentary record, which comprises contemporary witnesses' accounts as well as official records and military regulations. Since it was a sizeable military garrison, the assemblage allows us to assess the intended process of construction of an efficient national army, a principal goal of the first liberal governments after 1862. The analysis shows a great degree of

  16. Eskişehir’de Hava Kirliliği ve Doğal Gazın Tarihçesi: Genel Değerlendirme / History of Air Pollution and Natural Gas Usage in Eskişehir: A General Review

    Directory of Open Access Journals (Sweden)

    Nazmi Oruç

    2012-12-01

    şehir temiz hava planı (2011-2014 hazırlanmıştır. Partikül Madde ve SO2 yanında NO2,O3 ve PAH gibi kirleticilerin ve ulaşım araçlarının neden olduğu kirliliğin de irdelendiği bu raporda, Eskişehir için ulusal yasal sınır değerleri zorlayan bir durum söz konusu olmasa da geniş ölçekte Avrupa Birliği ve Dünya Sağlık Örgütü (DSÖ gibi kuruluşların oluşturmuş olduğu standartların üzerinde değerlere rastlandığı kaydedilmektedir. Hava kirliliğinin önlenmesi amacıyla doğal gaz kullanımına ilk kez Eskişehir Organize Sanayi Bölgesinde (EOSB Botaş bünyesinde 1990 yılında başlanılmış daha sonra bu hizmet özelleştirme kapsamı içerisinde 2004 yılında Eskişehir Doğal Gaz Dağıtım A.Ş. (ESGAZ firmasına devredilmiştir. ESGAZ, Büyükşehir Belediyesi mücavir alanlarda yer alan imara açık tüm cadde ve sokaklara doğal gaz hizmeti vermekte olup 2004 yılında devir alınan 107.000 bağımsız birim sayısını 2011 yılı sonu itibariyle 300.000’e çıkartmıştır. EOSB bölgesi hariç evsel ve şehir içi sanayi tüketimi de 2005 yılında 211.756.888 m3 iken, 2011 yılında 348.974.147 m3’e çıkmıştır. Tüm bu olumlu gelişmelere karşın doğal gaz alt yapısı bulunan bazı semt ve apartmanlarda günümüzde de ithal ve yerli kömür kullanılması zaman zaman hava kirliliğine neden olmaktadır. İlk aşamada kent merkezinde özellikle kış aylarında kömür yerine tamamen doğal gaza geçilmesi ve ulaşım kaynaklı hava kirliğinin azaltılması için gereken önlemlerin alınması önerilmiştir. History of Air Pollution and Natural Gas Usage in Eskişehir: A General Review The aim of this study is to investigate the use of natural gas and air pollution levels in Eskişehir City Center in the last 30 years. Air pollution has been phenomena in Eskişehir since the beginning of 1980s, due to the use of low quality coal, unplanned and irregular urbanization and negative climate factors. First air

  17. Reflexiones entorno al concepto de empresa virtual

    Directory of Open Access Journals (Sweden)

    Daniel Peña Valenzuela

    2007-08-01

    Full Text Available La convergencia entre las telecomunicaciones y la informática produce un replanteamiento de la noción tradicional de empresa. La empresa virtual es el resultado de la aplicación de las tecnologías de la información al modelo y estructura tradicional de las compañías1. Este cambio proviene del papel fundamental que tiene la información como célula de las compañías. La empresa es la expresión de la autonomía privada mediante la cual se organiza la producción de bienes y servicios, su distribución y comercialización y se articula la generación de riqueza. La información junto al capital son los elementos fundamentales para que la empresa surja y para que su desarrollo redunde en la puesta en marcha de una organización formal que administra riesgos, limita la responsabilidad de los asociados y confluye en la personalidad jurídica propia e independiente. Con la aparición de internet y del comercio electrónico, aparecieron empresas puramente electrónicas: las "punto com", cuyo destino fue desastroso en la mayoría de los casos. Sin embargo, este período inicial produjo un resultado evidente: las empresas tradicionales actualmente incluyen a las tecnologías de la información como herramienta de cambio en su estructura y como posibilidad de lograr mejores procesos internos. Ese cambio interno, aún en proceso de construcción, no es la única consecuencia relacionada con la empresa, la relación con los consumidores-clientes también se modifica, por ejemplo, por la aparición de los esquemas peer-to-peer en los que el usuario es creador y productor de contenidos y reemplaza a los empleados como factores de producción por excelencia. Los sitios web son el escenario de presentación de las empresas virtuales donde estas logran un punto de interacción con los consumidores y en los cuales se expresan las distintas áreas tradicionales de una sociedad comercial. El comercio electrónico es por su parte el medio ambiente de la

  18. Las reformas del permiso de conducción puestas en marcha en Europa y las investigaciones internacionales en este campo: cómo formar al conductor y a la conductora, cómo educar al hombre y a la mujer

    OpenAIRE

    Assailly, Jean-Pascal

    2010-01-01

    En este trabajo se presentan algunos resultados de investigaciones europeas recientes en materia de seguridad vial, teniendo en cuenta dos ejes clave: — La formación del conductor: se mostrará como las nuevas conceptualizaciones sobre el comportamiento en la conducción producirán modificaciones en la educación vial, en la formación inicial de los conductores, en el examen para obtener el permiso de conducir, en las medidas post permiso y más ampliamente, en el aprendizaje a lo largo de la vid...

  19. Amyotrophic Lateral Sclerosis (ALS)

    Science.gov (United States)

    ... benefit of 16 months before onset of severe respiratory failure. Other treatments are designed to relieve symptoms and ... of ALS. Most people with ALS die from respiratory failure, usually within 3 to 5 years from the ...

  20. Thermal Conductivity of Al-Salt Composites

    Science.gov (United States)

    Li, Peng; Zhang, Mei; Wang, Lijun; Seetharaman, Seshadri

    2015-11-01

    With a view to examine the possibility of estimating the content of entrapped metallic aluminium in the salt cake from aluminium remelting, the thermal diffusivity of reference composites of KCl-NaCl-Al was measured as a function of aluminium metal content at room temperature. The thermal conductivity of the reference composites was found to increase with the metallic Al content. The lumped parameter model approach was carried out to discuss the influence of different geometry arrangements of each phase, viz. air, salts and metallic aluminium on the thermal conductivity. Application of the present results to industrial samples indicates that factors such as the interfacial condition of metallic Al particles have to be considered in order to estimate the amount of entrapped Al in the salt cake.

  1. Air pollution in Copenhagen

    International Nuclear Information System (INIS)

    Aerosols were monitored in Greater Copenhagen in the period June 1973 to July 1974. Size-fractionated cascade impactor samples and unfractionated filter samples were regularly collected and analyzed be neutron activation analysis, spark emission spectroscopy or proton-induced X-ray emission spectroscopy. Concentrations were determined of the following elements: Al, Si, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Br, Mo, Cd, Sn, Sb, and Pb. All elements showed orders-of-magnitude fluctuationsthe mean concentrations were roughly the same as in other large cities. In relation to proposed air quality standards, Pb was the most critical component. Statistical analysis of variation patterns, size distributions and interelement correlations indicate that automotive exhaust is the source of Br and Pbfuel-oil combustion is the main source of V and Ni (and partly of S)soil dust raised by wind or by human activity (e.g. traffic) is the main source of Al, Si, Ca, Ti, and Fe. (author)

  2. Geoingeniería, apuesta incierta frente al cambio climático

    Directory of Open Access Journals (Sweden)

    Gian Carlo Delgado Ramos

    2012-01-01

    Full Text Available Ante el acelerado aumento de la concentración de gases de efecto invernadero, producto de un metabolismo social creciente (uso de energía y materiales, se ha propuesto, como potencial solución, la puesta en marcha de diversas tecnologías, entre ellas aquellas diseñadas para manipular y controlar el clima. El presente texto revisa el metabolismo social imperante y sus proyecciones para las próximas décadas, para desde ahí presentar la problemática y el reto del cambio climático, sus implicaciones y las soluciones tecnológicas de manipulación del clima propuestas desde un discurso político que aboga por una "economía verde". A partir de describir las geoingenierías propuestas, se revisa críticamente su complejidad, viabilidad, incertidumbres y potenciales implicaciones. Reconociendo que el uso de las geoingenierias es más un asunto económico-político que técnico, se concluye con un llamado a abrir el debate sobre las implicaciones y deseabilidad de tales o cuales geoingenierías, partiendo de la premisa de que la principal medida frente al cambio climático es la efectiva reducción del metabolismo social y por tanto de las emisiones.

  3. Ruedas cuadradas: Introducción al análisis de la falsa creatividad

    Directory of Open Access Journals (Sweden)

    Juan Martínez-Val

    2012-04-01

    Full Text Available El objetivo del artículo es analizar la denominada “falsa creatividad”. La creatividad es un valor social firmemente asentado. La falsa creatividad es aquella que se da en el proceso de creación, desarrollo o puesta a punto de un producto o servicio, destinado a un fin social. Es decir, una actividad que no tiene por qué estar ligada a las llamadas profesiones creativas ni a los conocidos como productos de diseño. El autor establece siete criterios diferenciales para analizar la “Falsa Creatividad”. Realiza una descripción exhaustiva de cada uno de ellos, identificando con ejemplos diversos los mismos. La falsa creatividad puede llevar al usuario o consumidor de un producto a rechazar este, o en todo caso, a obtener una imagen del mismo muy diferente a la que el creativo pensó, por lo que es indispensable garantizar que la creatividad en sí misma, no es un impedimento para el consumo de un producto concreto.

  4. Género, Desarrollo y Cooperación al Desarrollo

    Directory of Open Access Journals (Sweden)

    Teresa Rendón

    2003-02-01

    Full Text Available La diferenciación social existente entre hombres y mujeres -denominada "género"en la literatura de nuestros días- es considerada como una de las modalidades de desigualdad más generalizadas en el mundo contemporáneo. Por lo tanto, lograr la igualdad social entre los sexos constituye uno de los objetivos del desarrollo y de la cooperación al desarrollo. En un principio, a la luz de un enfoque denominado "Mujeres en el desarrollo", se buscaba una mayor y mejor integración femenina a la actividad económica para el mercado, mediante programas productivos y de capacitación dirigidos a grupos de mujeres. Más tarde, este enfoque centrado en las mujeres, se sustituyó por el de "Género en el Desarrollo", un enfoque más amplio e integrado que abarca los distintos ámbitos del desarrollo y de la cooperación, pues se reconoce que el problema de la inequidad entre los sexos no atañe sólo a las mujeres sino a la sociedad en su conjunto. No obstante, entre los planes y programas y su puesta en práctica hay todavía una enorme brecha.

  5. Air movement and perceived air quality

    DEFF Research Database (Denmark)

    Melikov, Arsen Krikor; Kaczmarczyk, J.

    2012-01-01

    The impact of air movement on perceived air quality (PAQ) and sick building syndrome (SBS) symptoms was studied. In total, 124 human subjects participated in four series of experiments performed in climate chambers at different combinations of room air temperature (20, 23, 26 and 28 °C), relative...... humidity (30, 40 and 70%) and pollution level (low and high). Most of the experiments were performed with and without facially applied airflow at elevated velocity. The importance of the use of recirculated room air and clean, cool and dry outdoor air was studied. The exposures ranged from 60. min to 235....... min. Acceptability of PAQ and freshness of the air improved when air movement was applied. The elevated air movement diminished the negative impact of increased air temperature, relative humidity and pollution level on PAQ. The degree of improvement depended on the pollution level, the temperature...

  6. Al4C3 Hydration Thermochemical Analysis for Burned Carbon-containing Refractories with Al

    Institute of Scientific and Technical Information of China (English)

    YANG Ding'ao; YU Zhiming; FAN Liuwu

    2003-01-01

    In this paper, X-ray diffractogram analysis and SEM observation of Al4 C3 formed at high temperature from carbon-containing refractories with Al have been carried out.Aluminum added to carbon-containing refractories reacts with C(s)to form Al4 C3(s) gradually during heating from 600 ℃ to 1200℃.It is considered that the interlocked structure of Al4 C3 plate crystals promotes the outstanding increase of hot modulus of rupture of carbon-containing refractories with Al. The HMOR of carbon-containing refractories added with Al additive from 0 to 5wt% increases by 2.8 times being from 6.5MPa to 18.2MPa.After a thermochemical calculation for hydration reaction processes of Al4 C3 and H2O(g), the equilibrium partial pressure chart of H2O(g)in H2O-Al4C3-Al(OH)3 system vs various temperatures has been attained . The H2O (g) partial pressure in the air needed for the Al4 C3 hydration reaction is no more than 10~18 atm at the temperature below 120℃.It is considered that the burned carbon-containing refractories with Al is extremely easy to hydrate and the cracking of burned carbon-containing refractories is generated because that the hydration expansion is 2.11 times during transforming from Al4 C3 to Al(OH)3.The fundamental measure against hydration of the refractories is to insulate the refractories from H2O(g)by various means such as pitch impregnation or other sealing materials.

  7. Nuevos tratamientos T6 para aleaciones de AlSi obtenidas por conformación en estado semisólido

    Directory of Open Access Journals (Sweden)

    Menargues, S.

    2013-08-01

    Full Text Available In this work the microstructural changes that occurs during the solution and aging steps of heat treated of AlSi alloys, conformed in semi-solid state, were analysed. The study allowed developing a new T6 heat treatment, with solution times down to 30 min. With this new short heat treatment, the alloy showed better mechanical properties in comparison with the same alloy heat treated in standard conditions (solution times between 6 h and 8 h. This new heat treatment, carried out at 540 ºC, allowed complete magnesium dissolution and, at the same time, minimizes the grain and eutectic silicon growth. Although this experimentation was carried out with A356 and A357 aluminum alloys, conformed by Sub-Liquidus-Casting process, these results may be applicable to components produced with other semi-solid technologies and with others AlSi hardenable alloys that form coherent magnesium precipitates. The characterization of samples was carried out by micrographic analysis, by hardness and ultramicrohardnes tests.Se estudian los cambios microestructurales que tienen lugar en los tratamientos térmicos de las aleaciones AlSi, conformadas en estado semisólido, durante las etapas de puesta en solución y envejecimiento. El estudio ha permitido proponer nuevos tratamientos T6, con tiempos de puesta en solución inferiores a los 30 min, manteniendo o mejorando las propiedades mecánicas que se obtienen con los actuales procesos de tratamiento de 6 a 8 h. Estos tratamientos de corta duración, realizados a 540 ºC, permiten una completa disolución del magnesio, minimizando al mismo tiempo el crecimiento de los granos y del silicio eutéctico. Si bien la experimentación se ha realizado con componentes producidos por Sub-Liquidus Casting (SLC con aleaciones A356 y A357, se considera que los resultados obtenidos pueden ser aplicables a los componentes producidos en estado semisólido por otras tecnologías, con diferentes aleaciones AlSi que se endurecen por

  8. Strain Rates and Grain Growth in Al 5754 and Al 6061 Friction Stir Spot Welds

    Science.gov (United States)

    Gerlich, A.; Yamamoto, M.; North, T. H.

    2007-06-01

    The stir zone temperature and microstructures are compared in friction stir spot welds produced in Al 5754 and Al 6061 alloys. Electron backscattered diffraction was used to determine the relationship between tool rotation speed during welding and final stir zone grain size. Comparison of the grain sizes in rapidly quenched welds with those in air-cooled joints confirmed that grain growth occurred only in Al 6061 spot welds. There was no evidence of abnormal grain growth in the stir zones of Al 6061 welds; the final grain size could be represented using an Arrhenius equation. The strain rates during welding were determined by incorporating the stir zone temperature and average subgrain sizes in quenched spot welds in the Zener-Hollomon relation. When the tool rotation speed increased from 750 to 3000 RPM, the strain rate values ranged from 180 to 497 s-1 in Al 5754 spot welds and from 55 to 395 s-1 in Al 6061 spot welds. It is suggested that a no-slip boundary condition may be appropriate during numerical modeling of Al 5754 and 6061 friction stir spot welding. This is not the case during Al 7075, Al 2024, and Mg-alloy AZ91 spot welding because spontaneous melting facilitates slippage at the tool contact interface.

  9. Consideraciones sobre el servicio de asesoramiento al regante para las condiciones de Cuba

    Directory of Open Access Journals (Sweden)

    Enrique Cisneros Zayas

    2011-01-01

    Full Text Available Los Servicios de Asesoramiento al Regante (SAR son sin duda una de las herramientas más interesantes para hacer del regadío una actividad sostenible, al tener como finalidad principal la mejora en la eficiencia en el uso y la gestión integral del agua de riego. En Cuba, el riego y el drenaje son imprescindibles para tener producciones de calidad, es por ello que no podemos renunciar a su ejecución. Por otra parte la mecanización masiva del riego, mediante la extensión de las máquinas de pivote central y otras, aunque logran elevadas productividades de áreas regadas por hombre, muestran signos de poca efectividad agrícola y baja eficiencia en el uso del agua, que están relacionada generalmente a su empleo incorrecto y al desconocimiento del modo de operar estas tecnologías, una de las vías para mejorar esta situación es a través de los SAR. En nuestro país se pretende poner en funcionamiento este servicio y ya se cuenta con algunas experiencias, las que están propiciando un flujo de información y conocimientos. El presente trabajo tiene como objetivo dar a conocer las experiencias adquiridas en Cuba durante su creación, se completa la información con los resultados obtenidos y se dan algunas consideraciones a tener en cuenta para su futura puesta en marcha.

  10. Astronom\\'ia al Aire: Media Convergence in Astronomy & Astrophysics

    CERN Document Server

    Núñez, Luis A

    2015-01-01

    We describe the experience of running an Astrophysics outreach initiative involving traditional mass media like radio broadcast and new digital media like blog, microblogging and internet video channel. Some very successful preliminary results are also presented. This unique experience is helping to create new science informal education environments for Spanish speaking people in Latin America.

  11. Evaluación de la recarga natural al acuífero de la cuenca superior del arroyo Napostá Grande, provincia de Buenos Aires Natural recharge evaluation of the aquifer in the upper Arroyo Napostá Grande basin, province of Buenos Aires

    Directory of Open Access Journals (Sweden)

    Jorge C. Carrica

    2004-06-01

    Full Text Available La cuenca superior del arroyo Napostá Grande constituye un área de interés para la explotación del recurso hídrico subterráneo como fuente alternativa de abastecimiento de agua a núcleos urbanos de la región entre los que se encuentra la ciudad de Bahía Blanca. El acuífero freático del sector recibe recarga directa de la lluvia a través de la zona no saturada, recarga localizada en el piedemonte serrano y, en mucha menor cuantía, la indirecta por almacenamiento de banco durante las crecidas del arroyo. El objetivo del estudio es determinar cuantitativamente el valor de la recarga y cuales de los mencionados mecanismos son los más importantes, mediante el empleo de distintos métodos: balances hidrológicos diarios a escala de cuenca (programa Visual Balan y de suelo (programa Balshort, balance de cloruros entre el agua de lluvia y el agua de la capa freática y análisis de la curva de recesión de hidrogramas fluviales. Se concluye que la recarga pluvial, localizada en el piedemonte serrano, es la principal fuente de alimentación del acuífero y que, según el método de estimación empleado, la recarga total al acuífero se cifra entre un 7 y un 9% de la precipitación anual media.The upper river basin of Napostá Grande creek constitutes an area of interest for ground water exploitation as an alternative source of water supply to Bahía Blanca city and other urban nuclei of the region. The phreatic aquifer in this area receives direct rain recharge through the unsaturated zone, recharge located in the piedmont area and indirect recharge from bank storage during the streamflow peak in smaller quantity. The objective of the study is to determine quantitatively the recharge and the ranking of the mentioned mechanisms through different methods: daily hydrologic balance both on basin scale (Visual Balan program and soil (Balshort program; chloride balance between rainwater and groundwater and analysis of the hydrograph recession

  12. Indoor Air Quality

    Science.gov (United States)

    ... protect yourself and your family. Learn more Air Quality at Work Workers should breathe easy while on the job, but worksites with poor air quality put employees at risk. Healthy air is essential ...

  13. Air protection. Ochrana ovzdusia

    Energy Technology Data Exchange (ETDEWEB)

    Siska, F.

    1980-01-01

    This paper discusses problems of air pollution control, air pollution abatement and effects of air pollution. Air pollution caused by black and brown coal combustion, by fossil-fuel power plants and by coking plants is evaluated. Air pollution by dusts, sulfur oxides, nitrogen oxides, carbon monoxide, ammonia as well arsenic, barium, beryllium, boron, chromium, gallium, cobalt, manganese, copper, nickel, lead, plutonium, titanium and vanadium, which sometimes accompany ashes in coal, is analyzed. Methods of air pollution abatement such as fluidized bed combustion, coal preparation, desulfurization or dry coke quenching are described. Systems for air pollution control are presented: air filtration, cyclones, electrostatic precipitators. Systems of air pollution measurement and recording are evaluated. Propagation of air pollutants in the atmosphere as well as the factors which influence pollutant propagation are characterized. Problems associated with site selection for fossil-fuel power plants are also discussed. An analysis of economic aspects of air pollution abatement and air pollution control is made. (55 refs.)

  14. HEPA air filter (image)

    Science.gov (United States)

    ... pet dander and other irritating allergens from the air. Along with other methods to reduce allergens, such ... controlling the amount of allergens circulating in the air. HEPA filters can be found in most air ...

  15. Bad Air Day

    Science.gov (United States)

    ... link, please review our exit disclaimer . Subscribe Bad Air Day Air Quality and Your Health In many parts of the country, summer has the worst air quality of any season. When the forecast says ...

  16. Volver al desarrollo

    Directory of Open Access Journals (Sweden)

    Jaime Ornelas Delgado

    2012-01-01

    Full Text Available El desarrollo, categoría empleada para expresar el crecimiento económico, surge durante la "guerra fría" y si bien fue propuesta por teóricos metropolitanos, se asumió en Latinoamérica como parte de los instrumentos disponibles para lograr el crecimiento y alternativa al socialismo. El desarrollo mantuvo su vigencia entre 1945 y 1975, cuando al advenimiento del neoliberalismo fue paulatinamente retirado de la agenda de las preocupaciones nacionales e internacionales. Al iniciarse el siglo xxi, el fracaso del mercado autorregulado trajo de nueva cuenta al debate los problemas del desarrollo, lo que obliga a revisarlo críticamente, tanto como al concepto mismo para mostrar su carácter colonial, si se quiere construir caminos ajenos al neoliberal y superar los problemas que han hecho de Latinoamérica una de las regiones más desiguales del mundo.

  17. Análisis de seguridad y salud ocupacional en el equipo de investigación a cargo del proyecto puesta en valor del patrimonio cultural del noreste de Santa Cruz a través del turismo

    Directory of Open Access Journals (Sweden)

    Ester Beatriz Bravo

    2014-06-01

    Full Text Available El equipo de investigación al que la becaria se incorpora, indaga el patrimonio cultural del noreste de Santa Cruz. Su plan de formación buscaba vincular el objeto de análisis con la Tecnicatura Universitaria en Seguridad e Higiene en el Trabajo que la alumna estudia. Resultó prioritario trabajar en el análisis de las condiciones propias de desempeño del equipo de investigación en relación a la seguridad, con el anhelo de contribuir al desarrollo de un sistema de gestión de Seguridad y Salud Ocupacional –recientemente iniciado- para posteriormente, adaptarlo a los diversos sitios y lugares de patrimonio cultural regionales.

  18. Jalta als Heterotopie

    OpenAIRE

    Schmid, Ulrich

    2013-01-01

    Jalta ist ein Ort, der sich im europäischen Kulturgedächtnis sowohl historisch als auch literarisch als "radikal anderer Ort" - als " Heterotopie" - festgesetzt hat. An der Konferenz von Jalta wurde 1945 eine neue Weltordnung geschaffen in der Hoffnung auf eine bessere Welt. Auch in den Werken von Anton ?echov, vor allem in denjenigen, die in Jalta entstanden sind, wird von einer anderen und besseren Welt geträumt.

  19. Pornographie als Metapher

    OpenAIRE

    Caroline Schubarth

    2010-01-01

    In diesem Artikel werden unterschiedliche metaphorische Verwendungen des Pornografiebegriffs und deren Implikationen untersucht. Während die Existenz von Pornografie der feministischen Anti-Porno-Bewegung als Erklärung für die anhaltende Diskriminierung von Frauen in westlichen Gesellschaften dient, nutzen rechtskonservative Kräfte den Pornografievorwurf als Rechtfertigung für die Zensur von als deviant empfundenen Identitäten und sexuellen Praktiken.This article...

  20. Pornographie als Metapher

    Directory of Open Access Journals (Sweden)

    Caroline Schubarth

    2010-02-01

    Full Text Available In diesem Artikel werden unterschiedliche metaphorische Verwendungen des Pornografiebegriffs und deren Implikationen untersucht. Während die Existenz von Pornografie der feministischen Anti-Porno-Bewegung als Erklärung für die anhaltende Diskriminierung von Frauen in westlichen Gesellschaften dient, nutzen rechtskonservative Kräfte den Pornografievorwurf als Rechtfertigung für die Zensur von als deviant empfundenen Identitäten und sexuellen Praktiken.

  1. Gezondheid als marketinginstrument

    NARCIS (Netherlands)

    Vijver, van de L.P.L.; Berg, van den I.

    2008-01-01

    Is biologisch voedsel beter dan gangbaar? Hoe hard zijn de bewijzen daarvoor? En hoe sterk moet het bewijs zijn voordat je het als claim op een product mag zetten? In dit Biokennis bericht een overzicht van de wetenschappelijke conclusies en de mogelijkheden om biologisch te promoten als beter, neer

  2. Al-Anon/Alateen

    Science.gov (United States)

    Find an Al-Anon meeting Español | Français 2018 Int'l Convention Home About Group Meetings What If I'm not ready ... a meeting? What can I expect at an Al-Anon meeting? What was my first meeting like? ...

  3. Indoor air: Contemporary sources, exposures and global implications

    Science.gov (United States)

    Morawska, Lidia; Salthammer, Tunga

    2015-04-01

    Recent 'Global Burden of Disease' studies have provided quantitative evidence of the significant role air pollution plays as a human health risk factor (Lim et al., The Lancet, 380: 2224-2260, 2012). Tobacco smoke, including second hand smoke, household air pollution from solid fuels and ambient particulate matter are among the top risks, leading to lower life expectancy around the world.

  4. Al - BASED CAST COMPOSITES

    Directory of Open Access Journals (Sweden)

    Rakesh Kumar Yadav

    2011-08-01

    Full Text Available The economy is very important feature nowadays in themarket. The researches are playing an important role inengineering field to increase the life of machine parts /components and decrease the cost. The compositematerials have the potential to replace widely used steeland aluminium due to their good characteristics withbetter performance. The Al-based composites have foundextensive applications in automobile industries andaerospace industries due to their increased stiffness,strength, thermal conductivity and wear resistanceproperties. A number of particulate phases have beenemployed in the Al-alloy matrix. The cast aluminiumceramicparticulate composites are finding applications inpistons, connecting rods, cylinder liner, engine cylinderblock, electrical contacts etc.The present investigation isbased on study of the effect of particulate phase on theSEM study, micro-hardness, elastic modulus, tensilestrength and the wear behaviour of Al-5 % SiC-7 % Fe,Al-10 % SiC-6 % Fe and Al-15 % SiC-5 % Fe composites.

  5. Investigación en innovación educativa, y puesta en marcha de iniciativas de mejora de la calidad en el ámbito de la docencia en estadística económica

    OpenAIRE

    Jano Salagre, María Dolores; González Martín, Ana Isabel; Marco Crespo, Rocío; Ortiz Serrano, Salvador; Soto Ortego, Francisco; Varela Merino, Begoña

    2005-01-01

    Ante el reto que supone el proceso de convergencia al Espacio Europeo en la Educación Superior (EEES), se pusieron en marcha varias iniciativas de mejora de la calidad en el ámbito de la docencia en estadística económica en la Universidad Autónoma de Madrid. Tales iniciativas se enmarcan dentro de un Proyecto de Innovación Docente (PID) realizado a lo largo del curso académico 2004-05 por un grupo de 6 profesores del Departamento de Economía Aplicada que impartieron docencia en la asignatura ...

  6. La puesta en juego de la interacción social: notas teóricas sobre el juego y apuntes etnográficos sobre las riñas de gallos

    Directory of Open Access Journals (Sweden)

    David E. Arias Marín

    2012-09-01

    Full Text Available El artículo se divide en dos partes: la primera, reseña los aportes conceptuales al estudio del juego como fenómeno social y cultural, así como los enfoques predominantes en las ciencias sociales que lo explican; la segunda parte, basada en un ejercicio de observación, presenta aspectos generales de lasriñas de gallos: su ambiente, las conductas de los jugadores, los momentos de interacción y los tipos de apuestas que se presentan en tal actividad.

  7. Evaluación de la puesta en marcha del enfoque metodológico por competencias comunicativas FOCAL SKILLS Evaluation of the Implementation of the FOCAL SKILLS Approach

    OpenAIRE

    Yasna Angélica Yilorm Barrientos; Andrea Bárbara Alicia Lizasoain Conejeros

    2012-01-01

    En este trabajo se describe el enfoque metodológico por competencias comunicativas FOCAL SKILLS propuesto por Hastings (2007 [1988]) -vinculado al modelo de comunicación de Jakobson (1960) y la teoría de la competencia comunicativa de Chomsky (1965)- y su posible aplicación en la Universidad Austral de Chile como estrategia para mejorar la adquisición del inglés como lengua extranjera por parte de los estudiantes. Además, se describen la metodología de implementación del enfoque y los obstácu...

  8. Adquisición y desarrollo de competencias a través de la elaboración y puesta en marcha de una campaña de marketing para la presentación de un monoplaza

    OpenAIRE

    Baena Graciá, Verónica; Padilla Valencia, Vicente

    2011-01-01

    Este artículo describe una actividad de innovación docente llevada a cabo en una universidad española durante el curso 2010/2011 que permitió acercar a los alumnos al mundo profesional a la vez que desarrollaban algunas de las competencias básicas requeridas en el entorno laboral. Esta actividad fue llevada a cabo entre alumnos de la Escuela Politécnica y la Facultad de Ciencias Sociales, coordinados por profesores de ambas Escuelas/Facultades de dicha Universidad. Los excelentes resultados o...

  9. REACH. Air Conditioning Units.

    Science.gov (United States)

    Garrison, Joe; And Others

    As a part of the REACH (Refrigeration, Electro-Mechanical, Air-Conditioning, Heating) electromechanical cluster, this student manual contains individualized instructional units in the area of air conditioning. The instructional units focus on air conditioning fundamentals, window air conditioning, system and installation, troubleshooting and…

  10. Macé, J. F. y Martínez Zauner, M. (Eds.. (2016. Pasado de violencia política. Memoria, discurso y puesta en escena. Madrid, MD: Anexo. 279 pp.

    Directory of Open Access Journals (Sweden)

    Maria P. Chiara Bianchini

    2016-06-01

    Full Text Available Pasado de violencia política es una obra colectiva, conformada por diez ensayos de jóvenes investigadores e investigadoras, procedentes de distintas disciplinas: historia, ciencias políticas, antropología, arqueología, filosofía, filología, historia del arte. Esta convergencia responde al carácter eminentemente interdisciplinario del ámbito al que adscribe el libro ―lo estudios de memoria― y de la Asociación que da vida a este proyecto, Memorias en Red. Sin embargo, en este caso, la recolección de ensayos no apunta a establecer comparaciones interdisciplinarias sobre algún objeto específico ―que es el enfoque más común de este tipo de obras― sino que su objetivo fundamental es discutir sobre la memoria en sí, sus dinámicas, funciones y manifestaciones. Persiguiendo este objetivo, el libro presenta un recorrido a través de objetos y contextos muy distintos: exhumaciones de fosas comunes, manifestaciones callejeras, ex centros de detención y tortura, prácticas de disidencia asociadas a la estética y la ética del cuerpo, procesamientos internacionales de derechos humanos y redes de activismo ciudadano. [...

  11. Indoor Air Pollution (Environmental Health Student Portal)

    Science.gov (United States)

    ... Students to Environmental Health Information Menu Home Air Pollution Air Pollution Home Indoor Air Pollution Outdoor Air Pollution ... Pollution Indoor Air Pollution Print this Page Air Pollution Air Pollution Home Indoor Air Pollution Outdoor Air Pollution ...

  12. EL ITINERARIO DIDÁCTICO INDUSTRIAL: EL PROBLEMA DE LA PUESTA EN PRÁCTICA DE LOS PRINCIPIOS TEÓRICOS EN EL “MOLINAR” DE ALCOY (ALICANTE.

    Directory of Open Access Journals (Sweden)

    Rafael Sebastia Alcaraz

    2010-12-01

    Full Text Available Resumen: Los itinerarios didácticos constituyen en apariencia un recurso muy innovador; sin embargo, conviene recordar la larga tradición pedagógica que los sustenta. Este recurso contribuye al desarrollo de capacidades del ser humano, genera aprendizajes significativos y motiva, tanto al docente con su preparación, como al alumno en su práctica. El itinerario industrial por la cuenca del río Molinar se desarrolla por un conjunto fabril en ruinas ubicado en las inmediaciones de Alcoy (Alicante. Este recurso ha sido concebido, particularmente, para explicar el origen de la industrialización, los factores de localización industrial y las relaciones entre el ser humano con su entorno. Palabras clave: Itinerarios didácticos, industrialización, unidad didáctica, Alcoy (Molinar, Alicante. Abstract: The didactic routes seem to be a very innovative resource, but it is convenient to remind their long teaching tradition. This resource contributes to the development of human capacities; it generates significant learning and motivates as much the teacher when preparing as the pupil when practicing. The industrial route along the river Molinar goes through factory ruins which are located in Alcoy and its surroundings (Alicante. The activity has been specially conceived to explain the origin of the industrialization, the industrial factors for choosing the site and the relations between the human being and his environment. Key words: Didactic routes, industrialization, didactic unit, Alcoy (Molinar, Alicante. RÉSUMÉ: Les itinéraires didactiques constituent apparemment un recours très innovateur; cependant il convient de rappeler leur longue tradition pédagogique. Ce recours contribue au développement de capacités de l´être humain et il engendre des apprentissages significatifs et motive, tant l’enseignant durant la préparation, comme l’élève durant la pratique. L’itinéraire industriel au long de la rivière Molinar parcourt l

  13. The cyclic oxidation resistance at 1200 C of Beta-NiAl, FeAl, and CoAl alloys with selected third element additions

    International Nuclear Information System (INIS)

    The intermetallic compounds Beta-NiAl, FeAl, and CoAl were tested in cyclic oxidation with selected third element alloy additions. Tests in static air for 200 1-hr cycles at 1200 C indicated by specific weight change/time data and x-ray diffraction analysis that the 5 at percent alloy additions did not significantly improve the oxidation resistance over the alumina forming baseline alloys without the additions. Many of the alloy additions were actually deleterious. Ta and Nb were the only alloy additions that actually altered the nature of the oxide(s) formed and still maintained the oxidation resistance of the protective alumina scale

  14. The cyclic oxidation resistance at 1200 C of beta-NiAl, FeAl, and CoAl alloys with selected third element additions

    Science.gov (United States)

    Barrett, C. A.; Titran, R. H.

    1992-01-01

    The intermetallic compounds Beta-NiAl, FeAl, and CoAl were tested in cyclic oxidation with selected third element alloy additions. Tests in static air for 200 1-hr cycles at 1200 C indicated by specific weight change/time data and x-ray diffraction analysis that the 5 at percent alloy additions did not significantly improve the oxidation resistance over the alumina forming baseline alloys without the additions. Many of the alloy additions were actually deleterious. Ta and Nb were the only alloy additions that actually altered the nature of the oxide(s) formed and still maintained the oxidation resistance of the protective alumina scale.

  15. [A.L. Lavoisier and the anesthetist].

    Science.gov (United States)

    Braun, U

    1988-11-01

    The activity of the anesthesiologist is centered upon the respiratory organ function; therefore, the question of how the fundamental knowledge of gas exchange was gained seems justified. During the 18th century, the elegant but incorrect phlogiston theory (G.E. Stahl, 1659-1734) dominated all theoretical conceptions about combustion and respiration. Chemistry at that time was a collection of observations without any sound hypothetical background. Our knowledge about oxidation, combustion, and respiration was developed mainly by the work of A.L. Lavoisier (1743-1794). He observed that metals gain weight during their calcination (oxidation) and concluded that air is taken up during this process. In these experiments he also proved that air consists of two elastic fluids (gases), one respirable and the other nonrespirable. After experiments with a sparrow breathing in a closed vessel until it expired, Lavoisier stated that during respiration respirable air (O2) is changed into fixed air (CO2) in the lungs with the mephitic portion of the air (N2) not taking part. These were the first investigations of respiration where accurate and reproduciable methods were applied. Respirable air is also transformed into fixed air by a burning candle. After investigations by which thermochemistry was founded, respiration could be defined as a slow form of combustion. In these and other biologically oriented experiments, Lavoisier developed direct and indirect calorimetry. He named respirable gas oxygen and explained the composition of water. In refuting the phlogiston theory, he established modern chemistry. His fate was sealed during the French revolution: in 1794 he was executed as a consequence of his activities as a farmer.(ABSTRACT TRUNCATED AT 250 WORDS)

  16. Sociale media als leermiddel

    NARCIS (Netherlands)

    Rubens, Wilfred

    2012-01-01

    Rubens, W. (2012, 5 juni). Sociale media als leermiddel. Presentatie over het gebruik van sociale media binnen het onderwijs, verzorgd tijdens een ouderraadbijeenkomst van de Katholieke Scholengemeenschap Etten-Leur, Etten-Leur, Nederland.

  17. MDA ALS Caregiver's Guide

    Science.gov (United States)

    ... R.D., C.N.S.D., L.D.N. Nutritionist MDA/ALS Center at Vanderbilt University Medical Center ... neurologists, physiatrists, therapists (physical, occupa- tional, speech, respiratory), nutritionists, social work- ers, pulmonologists, gastroenterologists and medical equipment ...

  18. Regionale Herkunft als Bonus

    OpenAIRE

    Kratochvil, Dr. Ruth

    2004-01-01

    Der Bio-Sektor durchlebt bewegte Zeiten. Die biologische Landwirtschaft hat sich aus der Nische herausbewegt und dafür an „Besonderheiten“ eingebüßt. Diese müssen als Zusatznutzen wiedergefunden werden.

  19. Partizipation als Ausnahmezustand

    OpenAIRE

    Korf, Benedikt

    2009-01-01

    In «Die Erfindung des Politischen» (1993) beschreibt Ulrich Beck Subpolitik als den Ort, an dem die Grenze zwischen Politik und Nichtpolitik verschwindet. Aus der zunehmenden Wirkkraft von Subpolitik erwächst die grundlegende Frage, mit welcher Legitimation diese Art von Subpolitik in die Sphäre der institutionalisierten Politik eindringt. Beck’s Subpolitik soll im Anschluss an theoretische Arbeiten von Chantal Mouffe und Giorgio Agamben als post-politische Aspiration bezeichnet werden, die e...

  20. Der Preis als Kaufbarriere?

    DEFF Research Database (Denmark)

    Mueller Loose, Simone

    2012-01-01

    Die Preispolitik hat eine herausragende Stellung im Marketing. Der Preis eines Produktes ist für Verbraucher ein direkter Kostenfaktor und für Unternehmen die Stellgröße im Mar-ketingmix, die den Umsatz am stärksten beeinflusst (vgl. Nieschlag et al. 2002). Wenn die Akzeptanz und der regelmäßige...... Verzehr gesunder Lebensmittel erhöht werden soll, ist es sowohl für die Verbraucherpolitik als auch für Lebensmittelproduzenten wichtig, den Ein-fluss des Preises auf die Kaufentscheidung zu verstehen. Aus Verbrauchersicht ist der Preis neben dem Geschmack die wichtigste Produkteigen-schaft beim Kauf von...... Lebensmitteln (vgl. Brunsø/Grunert 1998) und stellt eine Kaufbarrie-re für Lebensmittel mit gesundheitsfördernden Eigenschaften dar. Studien in den USA (vgl. Cassady et al. 2007), Frankreich (vgl. Drewnowski et al. 2004; Andrieu et al. 2005) und Deutschland (vgl. Karg et al. 2008) kommen übereinstimmend zu dem...

  1. Connectable solar air collectors

    Energy Technology Data Exchange (ETDEWEB)

    Oestergaard Jensen, S.; Bosanac, M.

    2002-02-01

    The project has proved that it is possible to manufacture solar air collector panels, which in an easy way can be connected into large collector arrays with integrated ducting without loss of efficiency. The developed connectable solar air collectors are based on the use of matrix absorbers in the form of perforated metal sheets. Three interconnected solar air collectors of the above type - each with an transparent area of approx. 3 m{sup 2} - was tested and compared with parallel tests on two single solar air collectors also with a transparent area of approx. 3 m{sup 2} One of the single solar air collectors has an identical absorber as the connectable solar air collectors while the absorber of the other single solar air collector was a fibre cloth. The efficiency of the three solar air collectors proved to be almost identical in the investigated range of mass flow rates and temperature differences. The solar air collectors further proved to be very efficient - as efficient as the second most efficient solar air collectors tested in the IEA task 19 project Solar Air Systems. Some problems remain although to be solved: the pressure drop across especially the connectable solar air collectors is too high - mainly across the inlets of the solar air collectors. It should, however, be possible to considerably reduce the pressure losses with a more aerodynamic design of the inlet and outlet of the solar air collectors; The connectable solar air collectors are easy connectable but the air tightness of the connections in the present form is not good enough. As leakage leads to lower efficiencies focus should be put on making the connections more air tight without loosing the easiness in connecting the solar air collectors. As a spin off of the project a simple and easy way to determine the efficiency of solar, air collectors for pre-heating of fresh air has been validated. The simple method of determining the efficiency has with success been compared with an advance method

  2. Desarrollo y aplicación del diagnóstico y pronóstico técnico al mantenimiento de los sistemas centralizados de aire acondicionado // Develop and application of the diagnosis and technical prediction to the maintenance of the centralized systems of conditi

    Directory of Open Access Journals (Sweden)

    J. L. Sánchez Ávila

    2000-10-01

    Full Text Available Se expone la aplicación del mantenimiento por diagnóstico y pronóstico técnico al sistema centralizado de aireacondicionado con recuperación del calor del hotel LTI Bella Costa; como solución a los graves problemas a que seenfrenta la dirección de servicios técnicos de las instalaciones turísticas para realizar un mantenimiento con calidad y a unmenor costo.El desarrollo de un plan experimental, en las instalaciones del hotel, permitió obtener las curvas que expresan elcomportamiento de la degradación de estos sistemas en el tiempo, así como determinar el momento más oportuno para larealización del mantenimiento.La aplicación de esta investigación permitió la implementación de un mantenimiento menos costoso y de más calidad,aumentando la rentabilidad de la labor del mantenimiento, y lo que es decisivo en este tipo de instalación: la seguridad en laexplotación como garantía de un servicio sin fallas.Palabras claves: mantenimiento, refrigeración, predictivo, diagnóstico, pronóstico.____________________________________________________________________Abstract:In this paper is exposed the application of the maintenance by diagnosis and technical prediction to the centralized systemof air conditioned with heat recovery of the hotel Beautiful LTI Costa; as a solution to the serious problems that thetechnical management services faces in the tourist facilities to carry out a maintenance with quality and whith smaller cost.The development of an experimental plan, in the hotel facilities, allowed to obtain the curves that express the behavior ofthe degradation of these systems in the time, as well as to determine the most opportune moment for the realization of themaintenance.The application of this investigation allowed the implementation of a less expensive maintenance and of more quality,increasing the profitability of the maintenance work, and what is decisive in this installation type: the security in theexploitation as a

  3. Effects of air humidity on ionization chamber response

    International Nuclear Information System (INIS)

    A study of the effect of air humidity on four different ionization chamber cap materials verified earlier studies (Kristensen and Sundbom, 1981; Mijnheer et al., 1983) and extended our understanding of the problem. We found nylon and A-150 plastic caps swell as they absorb water from the air. This accounts for as much as 2.5% increase in ionization response. Graphite chambers readily absorb and desorb water from the air. This creates a problem in maintaining dry air in a wet graphite chamber. Humid air has a different density and W value than dry air (Niatel, 1969, 1975). This decreases the charge collected in a wet graphite chamber. We observe a decrease in response of approximately 2%, a value greater than can be accounted for by these effects alone. Polyethylene chambers are unaffected by humid air. 4 refs., 9 figs

  4. Evaluación de la puesta en marcha del enfoque metodológico por competencias comunicativas FOCAL SKILLS Evaluation of the Implementation of the FOCAL SKILLS Approach

    Directory of Open Access Journals (Sweden)

    Yasna Angélica Yilorm Barrientos

    2012-01-01

    Full Text Available En este trabajo se describe el enfoque metodológico por competencias comunicativas FOCAL SKILLS propuesto por Hastings (2007 [1988] -vinculado al modelo de comunicación de Jakobson (1960 y la teoría de la competencia comunicativa de Chomsky (1965- y su posible aplicación en la Universidad Austral de Chile como estrategia para mejorar la adquisición del inglés como lengua extranjera por parte de los estudiantes. Además, se describen la metodología de implementación del enfoque y los obstáculos a los que los investigadores se han visto enfrentados, junto con posibles soluciones.This work describes the methodological approach to communicative competence FOCAL SKILLS as proposed by Hastings (2007 [1988] -an approach that is related to Jakobson's communication model (1960 and to Chomsky's theory of communicative competence (1965 - and considers its possible application within the Universidad Austral de Chile as a strategy for improving acquisition of English as a foreign language by students. This paper also examines the methodology for implementing this approach and the obstacles which the researchers have faced, along with possible solutions.

  5. Modification of residual stress in Al-[AlBO]w/Al compound plate

    Institute of Scientific and Technical Information of China (English)

    姜传海; 吴建生; 王德尊

    2001-01-01

    The application of compound parts of Al-[AlBO]w/Al not only reduces the cost of the parts but also improves its properties. However, there is a large thermal residual stress between Al and [AlBO]w/Al, and it is harmful for practical application. From the theoretical analyses and experimental results, it was found that by the compressive pre-plastic deformation perpendicular to the interface between Al and [AlBO]w/Al, the interlayer residual stress of compound parts can be reduced, while the mechanical properties of compound parts can be improved.

  6. Fortschritt als Fortschrittsdiskurs

    Directory of Open Access Journals (Sweden)

    Rainer Schmid-Zartner

    2014-12-01

    Full Text Available Zur Erzielung gesellschaftlichen Fortschritts in demokratisch verfassten Gesellschaften soll die Möglichkeit am Fortschrittsdiskurs teilnehmen zu können für alle Mitglieder der Gesellschaft als selbstverständliche Prämisse gelten. Fortschritt wird also als Bewusstseinsbildung dem Fortschritt selbst gegenüber und als Entscheidungs- und Handlungsfähigkeit auf individueller und gesellschaftlicher Ebene definiert. Dies setzt entsprechende Maßnahmen zur Befähigung dazu voraus, die alle Mitglieder der Gesellschaft erfassen. Dabei ist der Bildungsbereich angesprochen, insbesondere der Schulunterricht. Neben dem in der aktuellen blidungspolitischen Debatte forcierten Fokus auf den Aspekt der Kompetenzorientierung, der hier nicht infrage gestellt wird, ist als notwendige Ergänzung ein reflexionsorientierter Schulunterricht in allen Bildungsfächern einzufordern und umzusetzen. Im Weiteren beschreibt der Text den Weg von der Brauchbarkeit zur Bedeutsamkeit von schulischem Wissen durch Relevanzreflexionsprovokationen im Schulunterricht, um Sinn und Bedeutung der vermittelten Bildungsinhalte zu verhandeln. Am Beispiel von Mathematik als Bildungsfach wird der Inhalt von reflexionsorientertem Unterricht verdeutlicht. Darüber hinaus beschreibt der Text eine Reihe von konkreten Fallbeispielen aus der aktuell versuchsweise durchgeführten Unterrichtspraxis in Mathematik.

  7. Air Quality Facilities

    Data.gov (United States)

    Iowa State University GIS Support and Research Facility — Facilities with operating permits for Title V of the Federal Clean Air Act, as well as facilities required to submit an air emissions inventory, and other...

  8. Airing It Out.

    Science.gov (United States)

    Fitzemeyer, Ted

    2000-01-01

    Discusses how proper maintenance can help schools eliminate sources contributing to poor air quality. Maintaining heating and air conditioning units, investigating bacterial breeding grounds, fixing leaking boilers, and adhering to ventilation codes and standards are discussed. (GR)

  9. AirCompare

    Data.gov (United States)

    U.S. Environmental Protection Agency — AirCompare contains air quality information that allows a user to compare conditions in different localities over time and compare conditions in the same location...

  10. Allegheny County Air Quality

    Data.gov (United States)

    Allegheny County / City of Pittsburgh / Western PA Regional Data Center — Air quality data from Allegheny County Health Department monitors throughout the county. Air quality monitored data must be verified by qualified individuals...

  11. Air Quality System (AQS)

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Air Quality System (AQS) database contains measurements of air pollutant concentrations from throughout the United States and its territories. The measurements...

  12. Indoor air quality

    DEFF Research Database (Denmark)

    Jensen, Trine Susanne; Recevska, Ieva

     The objective of the 35th specific agreement is to provide support to the EEA activities in Environment and Health (E&H) on the topic of indoor air quality. The specific objectives have been to provide an overview of indoor air related projects in EU and indoor air related policies as well...... as idenfiying "good practices" to reduce health impact of indoor air exposure and suggest areas for future improvements....

  13. Una gran medida de ‘opinio juris’ y práctica estatal al gusto: ¿la receta de la costumbre internacional contemporánea?

    Directory of Open Access Journals (Sweden)

    Fabián Augusto Cárdenas Castañeda

    2015-01-01

    Full Text Available La práctica social internacional del derecho internacional contemporáneo no corresponde totalmente a la práctica que existía al momento del establecimiento de la CIJ. El mundo de 1945 definitivamente no es igual al del siglo XXI. Esta realidad ha transformado indudablemente el derecho internacional y cada uno de sus componentes vertebrales, incluyendo la teoría de las fuentes y sus diversos tipos. Desde tal perspectiva, la presente investigación busca revisar el concepto tradicional de la costumbre internacional mediante el estudio de sus dos ingredientes, en particular de la opinio juris, la cual será puesta a prueba a través del uso de literatura y jurisprudencia jurídicas contemporáneas. Luego de exponer algunas de las más grandes dificultades del concepto clásico de la opinio juris, se hará una presentación de novedosos y actualizados conceptos de ella. Lo anterior llevará a demostrar si de hecho se requiere un desarrollo de la definición clásica de la opinio juris y si se puede sugerir que esta es el único ingrediente requerido en la receta de la costumbre internacional contemporánea.

  14. Pornographie als Metapher

    Directory of Open Access Journals (Sweden)

    Caroline Schubarth

    2010-03-01

    Full Text Available In diesem Artikel werden unterschiedliche metaphorische Verwendungen des Pornografiebegriffs und deren Implikationen untersucht. Während die Existenz von Pornografie der feministischen Anti-Porno-Bewegung als Erklärung für die anhaltende Diskriminierung von Frauen in westlichen Gesellschaften dient, nutzen rechtskonservative Kräfte den Pornografievorwurf als Rechtfertigung für die Zensur von als deviant empfundenen Identitäten und sexuellen Praktiken.This article examines different metaphorical uses of the term pornography and the resulting implications. While the existence of pornography for the feminist anti-porno movement serves as factor in the continuing discrimination of women in western societies, conservative powers on the right use the allegation of pornography as a justification for censorship of those identities and sexual practices deemed deviant.

  15. Air Pollution Training Programs.

    Science.gov (United States)

    Public Health Service (DHEW), Rockville, MD.

    This catalog lists the universities, both supported and not supported by the Division of Air Pollution, which offer graduate programs in the field of air pollution. The catalog briefly describes the programs and their entrance requirements, the requirements, qualifications and terms of special fellowships offered by the Division of Air Pollution.…

  16. Indoor Air Pollution

    Science.gov (United States)

    We usually think of air pollution as being outdoors, but the air in your house or office could also be polluted. Sources of indoor pollution ... is known as sick building syndrome. Usually indoor air quality problems only cause discomfort. Most people feel ...

  17. Indoor Air Quality Manual.

    Science.gov (United States)

    Baldwin Union Free School District, NY.

    This manual identifies ways to improve a school's indoor air quality (IAQ) and discusses practical actions that can be carried out by school staff in managing air quality. The manual includes discussions of the many sources contributing to school indoor air pollution and the preventive planning for each including renovation and repair work,…

  18. We Pollute the Air

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    1.Clean air is important to good health.If the aircontains impurities,they may be absorbed by ourbodies and make us ill.We need clean air,butunfortunately,air pollution is generally present,especially in cities. 2.Our cities have many factories,which we need tomake food products,clothing and many other things.

  19. Air Travel Health Tips

    Science.gov (United States)

    MENU Return to Web version Air Travel Health Tips Air Travel Health Tips How can I improve plane travel? Most people don't have any problems when ... and dosages of all of your medicines. The air in airplanes is dry, so drink nonalcoholic, decaffeinated ...

  20. High Temperature Mechanical Characterization and Analysis of Al2O3 /Al2O3 Composition

    Science.gov (United States)

    Gyekenyesi, John Z.; Jaskowiak, Martha H.

    1999-01-01

    Sixteen ply unidirectional zirconia coated single crystal Al2O3 fiber reinforced polycrystalline Al2O3 was tested in uniaxial tension at temperatures to 1400 C in air. Fiber volume fractions ranged from 26 to 31%. The matrix has primarily open porosity of approximately 40%. Theories for predicting the Young's modulus, first matrix cracking stress, and ultimate strength were applied and evaluated for suitability in predicting the mechanical behavior of Al2O3/Al2O3 composites. The composite exhibited pseudo tough behavior (increased area under the stress/strain curve relative to monolithic alumina) from 22 to 1400 C. The rule-of-mixtures provides a good estimate of the Young's modulus of the composite using the constituent properties from room temperature to approximately 1200 C for short term static tensile tests in air. The ACK theory provides the best approximation of the first matrix cracking stress while accounting for residual stresses at room temperature. Difficulties in determining the fiber/matrix interfacial shear stress at high temperatures prevented the accurate prediction of the first matrix cracking stress above room temperature. The theory of Cao and Thouless, based on Weibull statistics, gave the best prediction for the composite ultimate tensile strength.

  1. Wikipedia als Referenzorgan

    OpenAIRE

    Voß, Jakob

    2006-01-01

    Wikipedia wird inzwischen von vielen Nutzern regelmäßig als Nachschlagewerk genutzt. Aufgrund des offenen Charakters der Online-Enzyklopädie, bei der sich jeder direkt beteiligen kann, ist jedoch zusätzliche Medienkompetenz notwendig, um die Qualität einzelner Wikipedia-Artikel einschätzen zu können. Im Vortrag sollen Methoden zur Beurteilung von Wikipedia-Artikeln dargestellt und die Frage beleuchtet werden, unter welchen Umständen Wikipedia als Referenzorgan geeignet ist.

  2. Carta al Editor

    Directory of Open Access Journals (Sweden)

    José Andrés Burgos Zuleta

    2010-06-01

    Full Text Available La medicina al basarse generalmente en la clínica, correlacionaexámenes complementarios y organiza un diagnóstico y tratamiento, es una disciplina donde es imprescindible saber recolectar, analizar, interpretar y concretar una respuesta adecuada, es así que la información que se recibe es esencial para el desempeño médico.La certeza es una realidad que se da en algunas situaciones y enotras las probabilidades establecen conclusiones. Lo normal muchas veces se define sobre la base de criterios estadísticos, basados en riesgos poblacionales que no necesariamente se aplican al caso boliviano.

  3. Air Conditioning Does Reduce Air Pollution Indoors

    Science.gov (United States)

    Healy, Bud

    1970-01-01

    Report of the winter meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers. Subjects covered are--(1) title subject, (2) predictions for the human habitat in 1994, (3) fans, and (4) fire safety in buildings. (JW)

  4. Forging of FeAl intermetallic compounds

    Energy Technology Data Exchange (ETDEWEB)

    Flores, O.; Juarez, J.; Campillo, B.; Martinez, L. [UNAM, Cuernavaca (Mexico). Lab. de Cuernavaca; Schneibel, J.H. [Oak Ridge National Lab., TN (United States)

    1994-09-01

    Much activity has been concentrated on the development of intermetallic compounds with the aim of improving tensile ductility, fracture toughness and high notch sensitivity in order to develop an attractive combination of properties for high and low temperature applications. This paper reports experience in processing and forging of FeAl intermetallic of B2 type. During the experiments two different temperatures were employed, and the specimens were forged after annealing in air, 10{sup {minus}2} torr vacuum and argon. From the results it was learned that annealing FeAl in argon atmosphere prior to forging resulted in better deformation behavior than for the other two environments. For the higher forging temperature used in the experiments (700C), the as-cast microstructure becomes partially recrystallized.

  5. Advanced air distribution

    DEFF Research Database (Denmark)

    Melikov, Arsen Krikor

    2011-01-01

    The aim of total volume air distribution (TVAD) involves achieving uniform temperature and velocity in the occupied zone and environment designed for an average occupant. The supply of large amounts of clean and cool air are needed to maintain temperature and pollution concentration at acceptable....... Ventilation in hospitals is essential to decrease the risk of airborne cross-infection. At present, mixing air distribution at a minimum of 12 ach is used in infection wards. Advanced air distribution has the potential to aid in achieving healthy, comfortable and productive indoor environments at levels...... higher than what can be achieved today with the commonly used total volume air distribution principles....

  6. Calculation of interaction of AlCl, AlCl2 and AlCl3 on Al4C3 (001) Al4CO4 (001) and Al2CO (001) planes

    Institute of Scientific and Technical Information of China (English)

    段少飞; 陈秀敏; 杨斌; 郁青春; 徐宝强; 刘大春

    2015-01-01

    To make sure the intermediate products of the carbothermic reduction of Al2O3 process, such as Al4CO4, Al2CO and Al4C3, and the interaction of AlCl, AlCl2, AlCl3 with Al4CO4, Al2CO and Al4C3, respectively, thermodynamic analyses were used to study the chloride reaction production of them under the vacuum situation. The stable structures and electronic properties of AlCl, AlCl2 and AlCl3 adsorbed on Al4CO4, Al2CO and Al4C3 were calculated by first-principles calculations by the CASTEP module in the Materials Studio program. The results show that the AlCl3 and AlCl2 molecules have decomposed on the plane of Al4C3 (001), while there are no obvious decomposition of AlCl3 and AlCl2 on Al4CO4 (001) and Al2CO (001) planes. The adsorption of AlCl on the Al4CO4 (001) and Al2CO (001) planes is stronger than that on the Al4C3(001) plane. The interaction strength of AlCl3, as well as AlCl2, with Al4CO4, Al2CO and Al4C3 is in the sequence of Al4CO4Al2CO>Al4C3.

  7. Interaction of hydrogen with an Mg-Al alloy (poster)

    DEFF Research Database (Denmark)

    Andreasen, A.; Andreasen, J.W.; Burkarl, R.;

    2004-01-01

    energy for dehydrogenation of the Mg-Al alloy is found to be approx. 160 kJ/mol. This is not significantly higher than for pure and fully activated Mg.Furthermore, it is found that Mg-Al is hydrogenated to MgH2 + Al and upon dehydrogenation a Mg-Al alloy is reformed. Pure Mg is not observed during...... dehydrogenation, suggesting that the formation of Mg-Al is fast compared to the liberation of hydrogen fromMgH2. From thermodynamical calculations using the semi-empirical Miedema model a slightly lower heat of hydride formation is found. Based on comparison with previous experiments on Mg exposed to air it is...

  8. Comentarios al Salto Social

    Directory of Open Access Journals (Sweden)

    Facultad de Ciencias Económicas

    1995-06-01

    Full Text Available 1. El Plan considera que la política social es un componente central de la estrategia macroeconómica. A diferencia de la administración Gaviria, lo social ha dejado de ser un asunto marginal, es consustancial al desarrollo y, por tanto, se le confiere una dimensión cualitativamente diferente.

  9. Slowenisch als fremdsprache

    Directory of Open Access Journals (Sweden)

    Jože Toporišič

    1981-12-01

    Full Text Available Nicht ganz zwei Millionen Menschen sprechen Slowenisch als Muttersprache. Wenige gibt es, die das Slowenische zwar spre­ chen oder zu sprechen versuchen, aber eine andere Muttersprache haben, vielleicht hunderttausend; für die ist Slowenisch also eine Fremdsprache.

  10. Released air during vapor and air cavitation

    Science.gov (United States)

    Jablonská, Jana; Kozubková, Milada

    2016-06-01

    Cavitation today is a very important problem that is solved by means of experimental and mathematical methods. The article deals with the generation of cavitation in convergent divergent nozzle of rectangular cross section. Measurement of pressure, flow rate, temperature, amount of dissolved air in the liquid and visualization of cavitation area using high-speed camera was performed for different flow rates. The measurement results were generalized by dimensionless analysis, which allows easy detection of cavitation in the nozzle. For numerical simulation the multiphase mathematical model of cavitation consisting of water and vapor was created. During verification the disagreement with the measurements for higher flow rates was proved, therefore the model was extended to multiphase mathematical model (water, vapor and air), due to release of dissolved air. For the mathematical modeling the multiphase turbulence RNG k-ɛ model for low Reynolds number flow with vapor and air cavitation was used. Subsequently the sizes of the cavitation area were verified. In article the inlet pressure and loss coefficient depending on the amount of air added to the mathematical model are evaluated. On the basis of the approach it may be create a methodology to estimate the amount of released air added at the inlet to the modeled area.

  11. Air Conditioner/Dehumidifier

    Science.gov (United States)

    1986-01-01

    An ordinary air conditioner in a very humid environment must overcool the room air, then reheat it. Mr. Dinh, a former STAC associate, devised a heat pipe based humidifier under a NASA Contract. The system used heat pipes to precool the air; the air conditioner's cooling coil removes heat and humidity, then the heat pipes restore the overcooled air to a comfortable temperature. The heat pipes use no energy, and typical savings are from 15-20%. The Dinh Company also manufactures a "Z" coil, a retrofit cooling coil which may be installed on an existing heater/air conditioner. It will also provide free hot water. The company has also developed a photovoltaic air conditioner and solar powered water pump.

  12. Manual for THOR-AirPAS - air pollution assessment system

    DEFF Research Database (Denmark)

    Jensen, Steen Solvang; Ketzel, Matthias; Brandt, Jørgen;

    The report provides an outline of the THOR-AirPAS - air pollution assessment system and a brief manual for getting started with the air quality models and input data included in THOR-AirPAS.......The report provides an outline of the THOR-AirPAS - air pollution assessment system and a brief manual for getting started with the air quality models and input data included in THOR-AirPAS....

  13. Influence of g-phase on the high- temperature oxidation of NiAl-Fe alloys

    Directory of Open Access Journals (Sweden)

    Maurício de Jesus Monteiro

    1999-07-01

    Full Text Available The oxidation of NiAl, NiAl-20at.%Fe and NiAl-30at.%Fe at 1000-1100 °C in air has been studied. Pure NiAl shows excellent oxidation resistance due to the formation of an Al2O3 layer. NiAl-20Fe also shows good oxidation resistance due to the formation of an Al2O3 scale on a b-phase substrate. Moreover, some nodules consisting of mixed oxides of Fe and Ni grow over the ductile g-phase surface incorporated to the b-phase substrate. NiAl-30Fe alloy undergoes a much faster oxidation due to the formation of a non-protective Fe and Ni-rich scale, which is extremely susceptible to spallation. The addition of Fe to NiAl is detrimental to its oxidation resistance.

  14. Effect of iodine on the corrosion of Au-Al wire bonds

    DEFF Research Database (Denmark)

    Verdingovas, Vadimas; Müller, Lutz; Jellesen, Morten Stendahl;

    2015-01-01

    Corrosion study was performed on Au-Al wire bonds, thin layers of sputter deposited Au and Al, and Au-Al intermetallic nuggets. The test environment was iodine-vapour in air (1. mg/L) at 85 °C with varying relative humidity, and 500 mg/L of KI in water. GDOES, XRD, SEM EDS, wire bond shear......, and electrochemical testing were used to characterize the samples. Failures of Au-Al wire bonds were found to be primarily attributed to the corrosion of Al via formation of Al iodides and consequent formation of Al oxides and/or hydroxides. Most susceptible to corrosion are Al metallization and Al rich intermetallic...

  15. Performance of commercial aluminium alloys as anodes in gelled electrolyte aluminium-air batteries

    Science.gov (United States)

    Pino, M.; Chacón, J.; Fatás, E.; Ocón, P.

    2015-12-01

    The evaluation of commercial aluminium alloys, namely, Al2024, Al7475 and Al1085, for Al-air batteries is performed. Pure Al cladded Al2024 and Al7475 are also evaluated. Current rates from 0.8 mA cm-2 to 8.6 mA cm-2 are measured in a gel Al-air cell composed of the commercial alloy sample, a commercial air-cathode and an easily synthesizable gelled alkaline electrolyte. The influence of the alloying elements and the addition to the electrolyte of ZnO and ZnCl2, as corrosion inhibitors is studied and analysed via EDX/SEM. Specific capacities of up to 426 mAh/g are obtained with notably flat potential discharges of 1.3-1.4 V. The competition between self-corrosion and oxidation reactions is also discussed, as well as the influence of the current applied on that process. Al7475 is determined to have the best behaviour as anode in Al-air primary batteries, and cladding process is found to be an extra protection against corrosion at low current discharges. Conversely, Al1085 provided worse results because of an unfavourable metallic composition.

  16. Air filtration in HVAC systems

    CERN Document Server

    Ginestet, Alain; Tronville, Paolo; Hyttinen, Marko

    2010-01-01

    Air filtration Guidebook will help the designer and user to understand the background and criteria for air filtration, how to select air filters and avoid problems associated with hygienic and other conditions at operation of air filters. The selection of air filters is based on external conditions such as levels of existing pollutants, indoor air quality and energy efficiency requirements.

  17. Health Effects of Air Pollution

    Science.gov (United States)

    ... air pollution How to protect yourself from air pollution Chemicals Noise Quizzes Links to more information girlshealth glossary girlshealth.gov home http://www.girlshealth.gov/ Home The environment and your health Air Health effects of air pollution ... Health effects of air pollution Breathing air that ...

  18. ALS insertion devices

    International Nuclear Information System (INIS)

    The Advanced Light Source (ALS), the first US third generation synchrotron radiation source, is currently under construction at the Lawrence Berkeley Laboratory. The low-emittance, 1.5 GeV electron storage ring and the insertion devices are specifically designed to produce high brightness beams in the UV to soft X-Ray range. The planned initial complement of insertion devices includes four 4.6 m long undulators, with period lengths of 3.9 cm, 5.0 cm (2) and 8.0 cm, and a 2.9 m long wiggler of 16 cm period length. Undulator design is well advanced and fabrication has begun on the 5.0 cm and 8.0 cm period length undulators. This paper discusses ALS insertion device requirements; general design philosophy; and design of the magnetic structure, support structure/drive systems, control system and vacuum system. 18 refs., 9 figs., 5 tabs

  19. De GPS al mapa

    Directory of Open Access Journals (Sweden)

    Esteban Dörries

    2016-03-01

    Full Text Available Las coordenadas Lambert obtenidas a partir de mediciones con equipos GPS de mano, llamados a veces navegadores, en ciertos casos confunden al usuario, por diferir claramente de su posición real al ser graficadas en un mapa del Instituto Geográfico Nacional (IGN: Esto puede resolverse con suficiente exactitud mediante una transformación de Molodensky, seguida de la correspondiente proyección cartográfica. Sin embargo, los tres parámetros necesarios para la transformación, supuestamente válidos para Costa Rica, se encuentran en muchas variantes y producen obviamente resultados diferentes. En este trabajo se analizan los fundamentos del problema y sus posibles soluciones, culminando con un estudio comparativo de ocho casos, que permite seleccionar los valores más adecuados para los parámetros.

  20. AL-IZDIWAJIYYAH AL-LUGHOWIYAH FII ISTIHDHAMI AL-LUGHOH AL-‘ARABIYAH

    OpenAIRE

    Imam Muslimin

    2011-01-01

    Al-Izdiwajiyyah (diglosia) is standardizing a specific language when there are two variants of language that live side by side in societal life and each variant has its own social function. Disglosia is related to the use of local languages variations of low language and high language in a community. In Arabic language, disglosia covers dialects among the speakers, for instance there are two variants of language that each has roles and functions. The use of the variant depends on the situatio...

  1. Carta al editor

    Directory of Open Access Journals (Sweden)

    Harry Pachajoa

    2012-02-01

    Full Text Available Recently, Valencia et al., published a very interesting article called «Lipid profile in a group of patients with Turner’s syndrome at Clínica Universitaria Bolivariana in the city of Medellín between 2000 and 2009". An article which evaluated lipid levels in patients withTurner syndrome in a Colombian clinic, the study associated results of lipid profile with karyotype and other risk factors for coronary heart disease.

  2. Carta al editor

    OpenAIRE

    Harry Pachajoa

    2012-01-01

    Recently, Valencia et al., published a very interesting article called «Lipid profile in a group of patients with Turner’s syndrome at Clínica Universitaria Bolivariana in the city of Medellín between 2000 and 2009". An article which evaluated lipid levels in patients withTurner syndrome in a Colombian clinic, the study associated results of lipid profile with karyotype and other risk factors for coronary heart disease.

  3. Creep strength of centrifugally cast Al-rich TiAl alloys

    Energy Technology Data Exchange (ETDEWEB)

    Sturm, D., E-mail: daniel.sturm@masch-bau.uni-magdeburg.de [Otto-von-Guericke-Universitaet Magdeburg, Institut fuer Werkstoff- und Fuegetechnik, Lehrstuhl Werkstoffprueftechnik, Postfach 4120, D-39016 Magdeburg (Germany); Heilmaier, M.; Saage, H. [Otto-von-Guericke-Universitaet Magdeburg, Institut fuer Werkstoff- und Fuegetechnik, Lehrstuhl Werkstoffprueftechnik, Postfach 4120, D-39016 Magdeburg (Germany); Paninski, M.; Schmitz, G.J.; Drevermann, A. [ACCESS e.V., Intzestrasse 5, D-52072 Aachen (Germany); Palm, M.; Stein, F.; Engberding, N. [Max-Planck-Institut fuer Eisenforschung GmbH, Max-Planck-Str. 1, D-40237 Duesseldorf (Germany); Kelm, K.; Irsen, S. [Stiftung Caesar, Electron Microscopy, Ludwig-Erhard-Allee 2, 53175 Bonn (Germany)

    2009-06-15

    High-temperature creep of a binary Al{sub 60}Ti{sub 40} (at.%) alloy in the as-cast state and after annealing at 1223 K for 200 h which produced nearly lamellar {gamma}-TiAl + r-Al{sub 2}Ti microstructure was studied utilizing creep compression tests in a temperature range between 1173 and 1323 K in air. The material was manufactured by centrifugal casting. Microstructural characterization was carried out employing light-optical scanning (SEM) and transmission electron microscopy (TEM) as well as X-ray diffraction (XRD) analyses. It is shown that the alloy exhibits reasonable creep resistance at 1173 K, especially in relation to its low density of around 3.8 g/cm{sup 3}. Stress exponents calculated as n = {Delta}log (strain rate)/{Delta}log (stress) = 4 were found to be relatively constant for the temperature and stress regime investigated. This indicates that dislocation climb may be the rate controlling creep mechanism. The assessment of creep tests conducted at identical stress levels and varying temperatures yielded activation energies for creep of around Q = 457 kJ/mol in the as-cast condition. This value is significantly higher than those found in literature for interdiffusion of Al or Ti in {gamma}-TiAl. It is concluded that the difference is a due to the instability of the microstructure of the as-cast multi-phase alloy.

  4. Indonesia's Clean Air Program

    OpenAIRE

    Budy P. Resosudarmo

    2002-01-01

    Unprecedented industrial development in Indonesia during the last two decades, accompanied by a growing population, has increased the amount of environmental damage. One of the most important environmental problems is that the level of air pollution in several large cities has become alarming, particularly in the last few years. This high pollution level has stimulated the government to develop a national clean air program designed to control the quantity of pollutants in the air. However, th...

  5. Air Quality in Lithuania

    Energy Technology Data Exchange (ETDEWEB)

    Pietilae, P. [Tampere University of Technology / ECAT-Lithuania (Lithuania); Kliucininkas, L. [Department for Environmental Engineering, Kaunas University of Technology (Lithuania)

    2000-07-01

    Sustainable monitoring of the ambient air is the major preventive measure of ensuring its proper quality. Only with a monitoring procedure going-on a continuous basis it is possible to make an objective evaluation of air pollution trends, of the efficiency of air protection measures and, partially, to a certain extent of the impact the pollution exerts on a human health. The information stemming from the monitoring procedure must be reliable, sustainable and efficient. (orig.)

  6. Olefin metathesis in air.

    Science.gov (United States)

    Piola, Lorenzo; Nahra, Fady; Nolan, Steven P

    2015-01-01

    Since the discovery and now widespread use of olefin metathesis, the evolution of metathesis catalysts towards air stability has become an area of significant interest. In this fascinating area of study, beginning with early systems making use of high oxidation state early transition metal centers that required strict exclusion of water and air, advances have been made to render catalysts more stable and yet more functional group tolerant. This review summarizes the major developments concerning catalytic systems directed towards water and air tolerance.

  7. Bad traffic, bad air

    OpenAIRE

    Duca, Edward

    2012-01-01

    Air pollution is one of Malta’s greatest concerns. Transportation is the principal source with over 300,000 vehicles belching out smoke, which damages our environment and health. Emissions from vehicles need to be monitored and controlled, and the information used to improve the current system and ensure an acceptable air quality. By using the pollution data set, Nicolette Formosa (supervised by Dr Kenneth Scerri) mapped the air pollution levels and major sources around Malta. http://www....

  8. 走近Air

    Institute of Scientific and Technical Information of China (English)

    马华

    2007-01-01

    @@ 大家对air这个单词并不陌生,它通常用作名词,表示"空气".例如: 1.Better let in fresh air. 最好让新鲜空气进来. 2.The air smells of paint. 空气里散发着油漆味. 3.The air was heavy with perfume of the flowers. 空气里弥漫着花朵的芳香.

  9. Applications Using AIRS Data

    Science.gov (United States)

    Ray, S. E.; Pagano, T. S.; Fetzer, E. J.; Lambrigtsen, B.; Olsen, E. T.; Teixeira, J.; Licata, S. J.; Hall, J. R.; Thompson, C. K.

    2015-12-01

    The Atmospheric Infrared Sounder (AIRS) on NASA's Aqua spacecraft has been returning daily global observations of Earth's atmospheric constituents and properties since 2002. With a 12-year data record and daily, global observations in near real-time, AIRS data can play a role in applications that fall under many of the NASA Applied Sciences focus areas. For vector-borne disease, research is underway using AIRS near surface retrievals to assess outbreak risk, mosquito incubation periods and epidemic potential for dengue fever, malaria, and West Nile virus. For drought applications, AIRS temperature and humidity data are being used in the development of new drought indicators and improvement in the understanding of drought development. For volcanic hazards, new algorithms using AIRS data are in development to improve the reporting of sulfur dioxide concentration, the burden and height of volcanic ash and dust, all of which pose a safety threat to aircraft. In addition, anomaly maps of many of AIRS standard products are being produced to help highlight "hot spots" and illustrate trends. To distribute it's applications imagery, AIRS is leveraging existing NASA data frameworks and organizations to facilitate archiving, distribution and participation in the BEDI. This poster will communicate the status of the applications effort for the AIRS Project and provide examples of new maps designed to best communicate the AIRS data.

  10. Asalto al poder en el porno. Apropiación y empoderamiento en las narraciones postpornográficas

    Directory of Open Access Journals (Sweden)

    Alberto García del Castillo

    2011-06-01

    Full Text Available Es labor de la postpornografía hacer que sexualidades otras y formas nuevas de follar salten al panorama público y, por tanto, político; su discurso crítico revisa la historia del porno desde el post-feminismo y las luchas homosexuales para ganar un espacio de representación y consumo de la sexualidad y permitir la visibilización de lo otro, antes ausente en la pornografía. El postporno, comprendido como representación propia del movimiento queer, alberga en su centro dinámicas de empoderamiento, en estrecha relación con estrategias de apropiación; es toma de poder en si mismo, pero también representación de apropiaciones posibles y creador por tanto de realidades disidentes del discurso normativo. El epoderamiento se juega tanto en el exterior como en el interior del postporno, siendo a la vez agente y documento de apropiaciones. Indagando en el interior de la narración postpornográfica descubrimos elementos que actúan apropiaciones de poder; la propia historia del postporno habla de la puesta en juego de estrategias de empoderamiento. Identificando estos elementos como actantes, se muestra atractiva la búsqueda de un modelo que permita sondar los mecanismos de empoderamiento jugados dentro de las narraciones postpornográficas; por ello, veremos de qué manera la semiótica se acerca a la propuesta contracultural de este asalto al poder en el porno.

  11. TiNおよびTi-Al-N系膜の酸化機構

    OpenAIRE

    井出, 幸夫; 中村, 崇; 川崎, 義幸

    1998-01-01

    Ti-Al-N films were deposited using an activated reactive evaporation (ARE) method with single vapor source of Ti-Al alloys. Oxidation behaviors of Ti-Al-N films were investigated in dry air in the temperature range from 673K to 1173K. Oxidation layers of the films were characterized by XRD, EPMA, XPS and TEM. The results are summarized as follows. (1) The oxidation characteristics of Ti-Al-N films improved more than 200 degrees camparing that of TiN film and the oxidation resistance of Ti-Al-...

  12. Restoran Buenos Aires = Restaurant Buenos Aires

    Index Scriptorium Estoniae

    2008-01-01

    Restorani Buenos Aires (Narva mnt. 5, Tallinn) sisekujundusest. Sisearhitektid: Janno Roos ja Andres Labi (Ruumilabor OÜ). Laudu eraldavad 400 vardasse aetud puukuuli. Sisearhitektidest, nende tähtsamad tööd. I-III korruse plaan, 12 värv. vaadet, fotod sisearhitektidest

  13. Over the air test

    DEFF Research Database (Denmark)

    2015-01-01

    [1] This invention relates to over-the-air testing of a device in an anechoic chamber. In particular, the invention is suitable for simulating both uplink and downlink over-the-air communication with a device under test even when the anechoic chamber has different numbers of uplink and downlink...

  14. Energy and air quality

    International Nuclear Information System (INIS)

    This is one of a series of handbooks designed to provide nontechnical readers with a general understanding of the interaction between energy development and environmental media and to provide a rudimentary data base from which estimates of potential future impacts can be made. This handbook describes the air quality impacts of energy development and summarizes the major federal legislation which regulates the potential air quality impacts of energy facilities and can thus influence the locations and timing of energy development. In addition, this report describes and presents the data which can be used as the basis for measurement, and in some cases, prediction of the potential conflicts between energy development and achieving and maintaining clean air. Energy utilization is the largest emission source of man-made air pollutants. Choices in energy resource development and utilization generate varying emissions or discharges into the atmosphere, the emissions are affected by the assimilative character of the atmosphere, and the resultant air pollutant concentrations have biological and aesthetic effects. This handbook describes the interrelationships of energy-related air emissions under various methods of pollution control, the assimilative character of the air medium, and the effects of air pollution. The media book is divided into three major sections: topics of concern relating to the media and energy development, descriptions of how to use available data to quantify and examine energy/environmental impacts, and the data

  15. Air Pollution, Teachers' Edition.

    Science.gov (United States)

    Lavaroni, Charles W.; O'Donnell, Patrick A.

    One of three in a series about pollution, this teacher's guide for a unit on air pollution is designed for use in junior high school grades. It offers suggestions for extending the information and activities contained in the textual material for students. Chapter 1 discusses the problem of air pollution and involves students in processes of…

  16. Air Pollution and Industry.

    Science.gov (United States)

    Ross, R. D., Ed.

    This book is an authoritative reference and practical guide designed to help the plant engineer identify and solve industrial air pollution problems in order to be able to meet current air pollution regulations. Prepared under the editorial supervision of an experienced chemical engineer, with each chapter contributed by an expert in his field,…

  17. AIR RADIOACTIVITY MONITOR

    Science.gov (United States)

    Bradshaw, R.L.; Thomas, J.W.

    1961-04-11

    The monitor is designed to minimize undesirable background buildup. It consists of an elongated column containing peripheral electrodes in a central portion of the column, and conduits directing an axial flow of radioactively contaminated air through the center of the column and pure air through the annular portion of the column about the electrodes. (AEC)

  18. Air-Conditioning Mechanic.

    Science.gov (United States)

    Marine Corps Inst., Washington, DC.

    This student guide, one of a series of correspondence training courses designed to improve the job performance of members of the Marine Corps, deals with the skills needed by air conditioning mechanics. Addressed in the four chapters, or lessons, of the manual are the following topics: principles of air conditioning, refrigeration components as…

  19. International Air Services

    OpenAIRE

    Productivity Commission

    2001-01-01

    On 12 December 1997 the Treasurer referred international air services arrangements to the Industry Commission for inquiry and report within nine months. The Commission was asked to report on the arrangements for negotiating entitlements under air services agreements and the process of allocating capacity entitlements to Australian carriers.

  20. Air pollution and air cleaning equipment in buildings

    OpenAIRE

    Evdokimova, Ekaterina

    2011-01-01

    The subject of this thesis work is air pollution and air cleaners in building. Clean air has big significance for human health because different pollutions can cause allergy and disease. The quality of indoor air affects health and effective working. The aim of this thesis is to present methods and devices for cleaning the air.

  1. Modeling neuronal vulnerability in ALS.

    Science.gov (United States)

    Roselli, Francesco; Caroni, Pico

    2014-08-20

    Using computational models of motor neuron ion fluxes, firing properties, and energy requirements, Le Masson et al. (2014) reveal how local imbalances in energy homeostasis may self-amplify and contribute to neurodegeneration in ALS.

  2. AL-USRCRN Station Information

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Documentation of United States Alabama Regional Climate Reference Network (AL-USRCRN) installations in 2006. Installations documented are for AL-USRCRN pilot...

  3. ICT als medicijn tegen onveiligheid

    OpenAIRE

    Linders, Lilian; Steyaert, Jan

    2002-01-01

    Hoe verhoudt ICT zich tot veiligheid? SQM zou niet 'ict oplossingen voor sociale kwesties' als ondertitel hebben, als we geen aandacht gaven aan deze vraag. In de eerste Rode Draad Notitie verkent SQM dit thema.

  4. AIRE-Linux

    Science.gov (United States)

    Zhou, Jianfeng; Xu, Benda; Peng, Chuan; Yang, Yang; Huo, Zhuoxi

    2015-08-01

    AIRE-Linux is a dedicated Linux system for astronomers. Modern astronomy faces two big challenges: massive observed raw data which covers the whole electromagnetic spectrum, and overmuch professional data processing skill which exceeds personal or even a small team's abilities. AIRE-Linux, which is a specially designed Linux and will be distributed to users by Virtual Machine (VM) images in Open Virtualization Format (OVF), is to help astronomers confront the challenges. Most astronomical software packages, such as IRAF, MIDAS, CASA, Heasoft etc., will be integrated into AIRE-Linux. It is easy for astronomers to configure and customize the system and use what they just need. When incorporated into cloud computing platforms, AIRE-Linux will be able to handle data intensive and computing consuming tasks for astronomers. Currently, a Beta version of AIRE-Linux is ready for download and testing.

  5. Transient oxidation of single-crystal beta-NiAl

    Science.gov (United States)

    Doychak, J.; Smialek, J. L.; Mitchell, T. E.

    1989-01-01

    The transient oxidation of beta-NiAl in air at 800 C and 1100 C has been studied using electron microscopy. The oxide scale consists predominantly of metastable Al2O3 phases. Theta-Al2O3 is the major oxide phase within 10.0 hr of oxidation at 800 C and 0.1 hr at 1100 C. The scales form epitaxially on (001) sub beta and (012) sub beta specimens throughout the transient stage, whereas the degree of preferred oxide orientation decreases with oxidation time on (011) sub beta and (111) sub beta specimens. The orientation relationships reflect the small mismatch between parallel close-packed directions in the metal and in the cation sublattice of the oxides. The correlation of distinctive oxide surface morphologies with internal structural defects indicates the strong tendency of the Al2O3 scale to grow via short-circuit diffusion paths.

  6. La integración al empleo de los condenados a una pena privativa de libertad

    OpenAIRE

    Ortega Bravo, María

    2016-01-01

    En este trabajo se pretende analizar la situación laboral que mantiene el preso durante su estancia en prisión y contemplar las distintas opciones de reinserción en la sociedad tras su puesta en libertad Grado en Relaciones Laborales y Recursos Humanos

  7. Gliricidia sepium al establecimiento

    Directory of Open Access Journals (Sweden)

    J. L. Valle

    2004-01-01

    Full Text Available Se asoció Cenchrus ciliaris (Cc y Gliricidia sepium (Gs para evaluar la producción de biomasa y la composición química de los forrajes en la fase de establecimiento, en el estado de Morelos, México, en condiciones de trópico seco. Se empleó un análisis de varianza con diseño en bloques al azar, en donde T1 fue pasto solo, T2 Cc más Gs con 5,000 plantas ha-1 y el T3 Cs más Gs con 14,285 plantas ha-1. Se midió la producción de forraje individual y asociado con materia seca (t MS/Ha, la altura (A en cm, la proteína cruda (PC%, las fracciones de fibra (FDN% y FDA% y la digestibilidad in vitro de la materia seca (DIVMS%. El T3 tuvo una mejor producción de biomasa (P0.05. La asociación de 14,285 plantas ha-1 de G. sepium con pasto Cenchrus ciliaris mejoró la producción de biomasa y la disponibilidad total de nutrientes por superficie cultivada al establecimiento

  8. Derivados vinculados al seguro.

    Directory of Open Access Journals (Sweden)

    De Paz Cobo, Sonia

    2003-01-01

    Full Text Available El presente trabajo tiene como objetivo la presentación de los derivados financieros como instrumentos de cobertura de los riesgos del seguro, así como de los principales proyectos que se desarrollan a través de los mismos, como por ejemplo los derivados sobre el clima. Hay que tener presente las pérdidas multimillonarias ocasionadas en casos como el de la banca Baring’s, o el de Orange County, por citar algunas, que si bien ciertos autores afirman que están en relación directa con el uso de estos productos, no podemos olvidar que los instrumentos derivados se desarrollaron con el objetivo principal de proteger al usuario de la posible volatilidad del activo subyacente. Ya en la industria aseguradora los derivados vinculados a tal actividad son instrumentos donde el pago se condiciona a la ocurrencia de su suceso de siniestro, o serie de sucesos múltiples que disparen las pérdidas. Tras el repaso efectuado y la descripción que este tipo de instrumentos puede tener en la gestión del riesgo por parte de la industria aseguradora, concluiremos con la exposición de las relaciones con el reaseguro tradicional así como una breve referencia al futuro de este tipo de instrumentos

  9. Air pollution holiday effect in metropolitan Kaohsiung

    Science.gov (United States)

    Tan, P.; Chen, P. Y.

    2014-12-01

    Different from Taipei, the metropolitan Kaohsiung which is a coastal and industrial city has the major pollution sources from stationary sources such as coal-fired power plants, petrochemical facilities and steel plants, rather than mobile sources. This study was an attempt to conduct a comprehensive and systematical examination of the holiday effect, defined as the difference in air pollutant concentrations between holiday and non-holiday periods, over the Kaohsiung metropolitan area. We documented evidence of a "holiday effect", where concentrations of NOx, CO, NMHC, SO2 and PM10 were significantly different between holidays and non-holidays, in the Kaohsiung metropolitan area from daily surface measurements of seven air quality monitoring stations of the Taiwan Environmental Protection Administration during the Chinese New Year (CNY) and non-Chinese New Year (NCNY) periods of 1994-2010. Concentrations of the five pollutants were lower in the CNY than in the NCNY period, however, that of O3 was higher in the CNY than in the NCNY period and had no holiday effect. The exclusion of the bad air quality day (PSI > 100) and the Lantern Festival Day showed no significant effects on the holiday effects of air pollutants. Ship transportation data of Kaohsiung Harbor Bureau showed a statistically significant difference in the CNY and NCNY period. This difference was consistent with those found in air pollutant concentrations of some industrial and general stations in coastal areas, implying the possible impact of traffic activity on the air quality of coastal areas. Holiday effects of air pollutants over the Taipei metropolitan area by Tan et al. (2009) are also compared.

  10. A posta principal da animação: pensar no atuar local e atuar no pensar global The locus of animation: thinking of local action and acting in global thinking La puesta principal de la animación: pensar en el actuar locar y en actuar local y actuar en el pensar global

    Directory of Open Access Journals (Sweden)

    2006-11-01

    Full Text Available Este artigo pesquisa a significação de um pensamento sistêmico, interacionista e dialético a propósito da animação dita “sociocultural” ou “social” em muitos países, mas que provém de uma animação profissional na França desde os anos sessenta (contudo não exclusivamente agora no mundo. Uma aproximação de tipo epistemológico, científico e teórico, junto a um descanso temático de pesquisa durante quase seis meses na América Latina, e depois na Europa, permite um olhar abrangente das postas da animação no contexto atual. PALAVRAS-CHAVE: animação – fenômeno da urbanização – hiper-especialização – novas tecnologias – o atuar e o pensar This article investigates the meaning of a sistemic, interactionist, and dialectic thought about animation, which is known in many countries as “sociocultural”, or “social”, but whihc originates from the professional animation developed in France from the 1960s. It is an epistemologic, scientific, and theoretical approach, based on an almost six-month long research internship in Latin America and then Europe, which allowed for the construction of a comprehensive analysis of the place of animation in the current context. KEYWORDS: coordination – urbanization phenomenon – hyper-specialization – new technologies – globalization Este artículo investiga la significación de un pensamiento sistémico, interaccionista y dialéctico a propósito de la animación dicha “sociocultural” o “social” en muchos países, pero que porviene de una animación profesional en Francia desde los años sesenta (sin embargo, no exclusivamente ahora en el mundo. Un acercamiento de tipo epistemológico, científico y teórico, junto a una vocación temática de investigación durante casi seis meses en América Latina, y después en Europa, que permite una vista alargada de las puestas de la animación en el contexto actual. PALABRAS-CLAVE: animación – fenómeno de

  11. LA ESCASA APLICACIÓN DE LA TEORÍA DE RESPUESTA AL ÍTEM EN TESTS DE EJECUCIÓN TÍPICA

    Directory of Open Access Journals (Sweden)

    Facundo Juan Pablo Abal

    2010-01-01

    Full Text Available El objetivo de este trabajo fue exponer los factores que explicanla escasa aplicación de la Teoría de Respuesta al Ítem(TRI en tests de ejecución típica. Una revisión exploratoriade la literatura psicométrica permitió identificar dos factores:el histórico, que remite a problemas en la difusión de la TRIpor fuera del campo educativo y a las demandas sociales queprivilegiaron su aplicación en el contexto educativo; y el factorasociado a la aplicación, que describe los obstáculos que enla actualidad dificultan la puesta en práctica de los modelosen tests de ejecución típica. Aunque ambos factores fueronrelativamente superados, el impacto de estos en la produccióncientífica del área es aún significativo.

  12. TRANSICIONES CURRICULARES EN EDUCACIÓN INTERCULTURAL: DESDE EL ROCK Y EL HIP-HOP, AL CANTO TRADICIONAL MAPUCHE (ÜL

    Directory of Open Access Journals (Sweden)

    Amilcar Forno Sparosvich

    2015-12-01

    Full Text Available En una aproximación cualitativa y una perspectiva analítica performativa relevamos la presencia de lenguajes musicales diversos en la educación intercultural, teniendo como caso de estudio a educadores tradicionales mapuches que incorporan dispositivos curriculares en escuelas con programas de educación intercultural bilingüe (EIB, localizadas en la ciudad de Puerto Montt (Chile. Nuestras reflexiones principales apuntan al relevamiento de estrategias etnomusicales descolonizadoras puestas en juego en el aula, en las que se evidencia la ampliación de repertorio musical en la noción tradicional del canto mapuche (ül que manifiestan los docentes. Para los y las docentes entrevistados, esta noción se abre para incluir, entre otros, algunos epewkantun, además de canciones con funciones didácticas (empleadas como recursos mnemotécnicos y canciones winka, estas últimas en la forma de re-mixtura de expresiones musicales urbanas. Estas nuevas prácticas musicales apuntan a favorecer la reafirmación étnica de sus estudiantes, desde un posicionamiento de identidad mapuche urbana, en ruptura con la noción esencialista de cultura. Estas transiciones curriculares estarían constituyendo un nuevo escenario en las prácticas musicales dentro del aula intercultural, caracterizadas de manera tradicional por la incorporación de canciones políticamente ingenuas.

  13. El hombre con su contradicción: del desflorador avergonzado al "hombre color mujer". // The man with his contradiction: from ashamed deflowered to "woman-colored man".

    Directory of Open Access Journals (Sweden)

    Fredy Ricardo Moreno Chía.

    2009-12-01

    Full Text Available The basis of this article is the idea that “the masculine” has an internal contradiction. This is supported by some freudian references, and brought out by Jacques Lacan’s formulations, particularly in his sexuation theory and his innovations on the borromean knot. We wonder how these statements explain the internal contradiction of masculinity, and we look for a possible answer in Lacan’s assertion that there is a “woman-colored man”, whose context corresponds to his theory of the sinthome. // El presente trabajo parte de la idea según la cual “lo masculino” posee una contradicción interna. Esta idea que es sustentada en algunas referencias freudianas es puesta a la luz de las formulaciones de Jacques Lacan, en particular su teoría de la sexuación y sus desarrollos en torno al nudo borromeo. Nos preguntamos cómo estas formulaciones dan cuenta de esa contradicción interna de la masculinidad, e intentamos una posible respuesta en la afirmación de Lacan, según la cual hay “hombre color mujer” y cuyo contexto corresponde a su teoría acerca del sinthome.

  14. Air Baltic: Estonian Air on nurka surutud / Teele Tammeorg

    Index Scriptorium Estoniae

    Tammeorg, Teele

    2010-01-01

    Air Balticu asepresidendi Janis Vanagsi hinnangul on Estonian Air aastaid jätnud tähelepanuta oma peamised turismiturud ning on praegu halvas seisus. Air Baltic on endiselt huvitatud Estonian Airi ostust. Majandus- ja kommunikatsiooniminister Juhan Partsi seisukoht

  15. Puesta en marcha del sensor inercial MTi de Xsens

    OpenAIRE

    Morales Tejero, Daniel

    2011-01-01

    El departamento de Ingeniería de Sistemas y Automática de la Universidad Carlos III de Madrid está desarrollando el robot humanoide TEO con fines de investigación en este campo. Una de las partes fundamentales es la estabilidad de dicho humanoide y para ello, se ha realizado este proyecto. El objetivo de éste es la integración del sensor inercial MTi de la marca Xsens, para que genere los datos adecuados de posición y orientación, que serán usados en el control del robot. Para llevar a cabo e...

  16. El teatro de guerra: una puesta en escena del sujeto

    Directory of Open Access Journals (Sweden)

    MARIA C. CASTRO

    2005-01-01

    Full Text Available El acercamiento a la guerra desde la perspectiva del picoanálisis permite indagar acerca del sujeto puesto en escena. Con Freud y Lacan hay la ocasión para descifrar el poder de la guerra y su comando mortífero, explorándola en su dimensión de discurso, un camino que posibilitan rastrear los tempranos aportes de Clausewitz. En la vía de dilucidar sobre el sujeto implicado en el acto de dar muerte y la vertiente del sacrificio, puede apelarse a las palabras de algunos que fueron combatientes de una organización paramilitar en el conflicto bélico que se vive en Colombia.

  17. A synthetic zero air standard

    Science.gov (United States)

    Pearce, Ruth

    2016-04-01

    A Synthetic Zero Air Standard R. E. Hill-Pearce, K. V. Resner, D. R. Worton, P. J. Brewer The National Physical Laboratory Teddington, Middlesex TW11 0LW UK We present work towards providing traceability for measurements of high impact greenhouse gases identified by the World Meteorological Organisation (WMO) as critical for global monitoring. Standards for these components are required with challengingly low uncertainties to improve the quality assurance and control processes used for the global networks to better assess climate trends. Currently the WMO compatibility goals require reference standards with uncertainties of < 100 nmolmol-1 for CO2 (northern hemisphere) and < 2 nmolmol-1 for CH4 and CO. High purity zero gas is required for both the balance gas in the preparation of reference standards and for baseline calibrations of instrumentation. Quantification of the amount fraction of the target components in the zero gas is a significant contributor to the uncertainty and is challenging due to limited availability of reference standard at the amount fraction of the measurand and limited analytical techniques with sufficient detection limits. A novel dilutor was used to blend NPL Primary Reference Gas Mixtures containing CO2, CH4 and CO at atmospheric amount fractions with a zero gas under test. Several mixtures were generated with nominal dilution ratios ranging from 2000:1 to 350:1. The baseline of two cavity ring down spectrometers was calibrated using the zero gas under test after purification by oxidative removal of CO and hydrocarbons to < 1 nmolmol-1 (SAES PS15-GC50) followed by the removal of CO2 and water vapour to < 100 pmolmol-1 (SAES MC190). Using the standard addition method.[1] we have quantified the amount fraction of CO, CO2, and CH4 in scrubbed whole air (Scott Marrin) and NPL synthetic zero air. This is the first synthetic zero air standard with a matrix of N2, O2 and Ar closely matching ambient composition with gravimetrically assigned

  18. Corrosion behaviour of Al/SiC and Al/Al2O3 nanocomposites

    Directory of Open Access Journals (Sweden)

    Tamer Samir Mahmoud

    2012-12-01

    Full Text Available In the present investigation, the static immersion corrosion behavior of Al/Al2O3 and Al/SiC nanocomposites in 1 M HCl acidic solution was evaluated. The nanocomposites were fabricated using conventional powder metallurgy (P/M route. The effect of nanoparticulates size and volume fraction on the corrosion behavior of nanocomposites was studied. The durations of the corrosion tests ranged from 24 to 120 hours and the temperatures of the solution ranged from ambient to 75 ºC. The corrosion rates of the nanocomposites were calculated using the weight loss method. The results showed that both Al/SiC and Al/Al2O3 MMNCs have lower corrosion rates than the pure Al matrix. Such behavior was noticed at both ambient and higher temperatures. Generally, the Al/Al2O3 nanocomposites exhibited lower corrosion rates than the Al/SiC nanocomposites. The Al/Al2O3 (60 nm nanocomposites exhibited the highest corrosion resistance among all the investigated nanocomposites. The corrosion rate was found to be reduced by increasing of the exposure time and the volume fraction of the nanoparticulates, while it was found to be increased by increasing of the nanoparticulates size and the solution temperature.

  19. Doppelthydrophile Blockcopolymere als Mineralisationstemplate

    Science.gov (United States)

    Kasparova, Pavla

    2002-07-01

    Die vorliegende Arbeit beschäftigt sich mit der Synthese und den Eigenschaften von doppelthydrophilen Blockcopolymeren und ihrer Anwendung in einem biomimetischen Mineralisationsprozeß von Calciumcarbonat und Bariumsulfat. Doppelthydrophile Blockcopolymere bestehen aus einem hydrophilen Block, der nicht mit Mineralien wechselwirkt und einem zweiten Polyelektrolyt-Block, der stark mit Mineraloberflächen wechselwirkt. Diese Blockcopolymere wurden durch ringöffnende Polymerisation von N-carboxyanhydriden (NCA's) und a-methoxy-ω-amino[poly(ethylene glycol)] PEG-NH2 als Initiator hergestellt. Die hergestellten Blockcopolymere wurden als effektive Wachstumsmodifikatoren für die Kristallisation von Calciumcarbonat und Bariumsulfat Mineralien eingesetzt. Die so erhaltenen Mineralpartikel (Kugeln, Hantel, eiförmige Partikel) wurden durch Lichtmikroskopie in Lösung, SEM und TEM charakterisiert. Röntgenweitwinkelstreuung (WAXS) wurde verwendet, um die Modifikation von Calciumcarbonat zu ermitteln und die Größe der Calciumcarbonat- und Bariumsulfat-Nanopartikel zu ermitteln. This work describes the synthesis and characterization of double hydrophilic block copolymers and their use in a biomimetic mineralization process of Calcium Carbonate and Barium Sulfate. Double hydrophilic block copolymers consist of a hydrophilic block that does not interact with minerals and another hydrophilic polyelectrolyte block that strongly interacts with mineral surfaces. These polymers were synthesised via ring opening polymerisation of N-carboxyanhydride (NCA), and the first hydrophilic block a-methoxy-ω-amino[poly(ethylene glycol)] PEG-NH2 was used as an initiator. The prepared block copolymers were used as effective crystal growth modifiers to control the crystallization of Calcium Carbonate and Barium Sulfate minerals. The resulting mineral particles (spheres, dumbbells, egg-like particles) were characterised by light microscopy in solution, by SEM, and by TEM. X-Ray scattering

  20. COMENTARIO AL CASO PINOCHET

    Directory of Open Access Journals (Sweden)

    Alberto Contreras Clunes

    2002-01-01

    Full Text Available El fallo en el caso Pinochet tiene distintas formas de ser analizado. De partida, desde un punto de vista político, también constitucional, del derecho penal. Sin embargo, nos abocaremos al estudio desde el punto de vista procesal, en especial a lo referido al Debido Proceso. Para ello se analizará los presupuestos, la solución dada por la Excma. Corte Suprema y las consecuencias del mismo. Además, se criticará la solución dada, desde la óptica de las garantías procesales del imputado, contenidas en el nuevo proceso penal y lo dispuesto en la Constitución y la Convención Americana de Derechos Humanos. Finalmente, se argumentará en favor de una interpretación finalista y armónica de la Constitución y los tratados internacionales de derechos humanos.The verdict of the Pinochet Case has different ways of being analyzed: from the political, the constitutional, and the penal law points of view. However, we will approach this study from the legal point of view, especially to that referred to as the Proper Process. To do this, the budgets, the solution given by the Most Excellent Supreme Court, and its consequences will be analyzed. Furthermore, the given solution will be criticized from the point of view of the legal guarantees of the accused contained in the new penal process and what is contained in the Constitution and in the American Convention of Human Rights. In conclusion, we will argue in favor of a final and harmonious interpretation of the Constitution and the international agreement of human rights.

  1. Olefin metathesis in air.

    Science.gov (United States)

    Piola, Lorenzo; Nahra, Fady; Nolan, Steven P

    2015-01-01

    Since the discovery and now widespread use of olefin metathesis, the evolution of metathesis catalysts towards air stability has become an area of significant interest. In this fascinating area of study, beginning with early systems making use of high oxidation state early transition metal centers that required strict exclusion of water and air, advances have been made to render catalysts more stable and yet more functional group tolerant. This review summarizes the major developments concerning catalytic systems directed towards water and air tolerance. PMID:26664625

  2. Clean Air and Water

    Centers for Disease Control (CDC) Podcasts

    2007-04-10

    The air we breathe and the water we drink are both vital components of our health. Nevertheless, bacteria, pollutants, and other contaminates can alter life-giving air and water into health-threatening hazards. Learn about how scientists at the Centers for Disease Control and Prevention work to protect the public from air and water-related health risks.  Created: 4/10/2007 by CDC National Center for Environmental Health.   Date Released: 4/13/2007.

  3. Air/liquid collectors

    DEFF Research Database (Denmark)

    Jensen, Søren Østergaard; Olesen, Ole; Kristiansen, Finn Harken

    1997-01-01

    This report determine efficiency equations for combined air/liquid solar collectors by measurements on to different air/liquid collectors. Equations which contain all relevant informations on the solar collectors. A simulation program (Kviksol) has been modified in order to be able to handle...... this kind of collectors. The modified simulation program has been used for the determination of the surplus in performance which solar heating systems with this type of solar collectors for combined preheating of ventilation air and domestic hot water will have. The simulation program and the efficiency...

  4. Olefin metathesis in air

    Directory of Open Access Journals (Sweden)

    Lorenzo Piola

    2015-10-01

    Full Text Available Since the discovery and now widespread use of olefin metathesis, the evolution of metathesis catalysts towards air stability has become an area of significant interest. In this fascinating area of study, beginning with early systems making use of high oxidation state early transition metal centers that required strict exclusion of water and air, advances have been made to render catalysts more stable and yet more functional group tolerant. This review summarizes the major developments concerning catalytic systems directed towards water and air tolerance.

  5. Olefin metathesis in air

    Science.gov (United States)

    Piola, Lorenzo; Nahra, Fady

    2015-01-01

    Summary Since the discovery and now widespread use of olefin metathesis, the evolution of metathesis catalysts towards air stability has become an area of significant interest. In this fascinating area of study, beginning with early systems making use of high oxidation state early transition metal centers that required strict exclusion of water and air, advances have been made to render catalysts more stable and yet more functional group tolerant. This review summarizes the major developments concerning catalytic systems directed towards water and air tolerance. PMID:26664625

  6. Indoor Air Quality

    Science.gov (United States)

    Miyazaki, Takeji

    The reduction of intake of outdoor air volume in air conditioned buildings, adopted as the strategy for saving energy, has caused sick building syndrome abroad. Such symptoms of sick building as headache, stimuli of eye and nose and lethargy, appears to result from cigarette smoke, folmaldehyde and volatile organic carbons. On the other hand, in airtight residences not only carbon monoxide and nitrogen oxides from domestic burning appliances but also allergens of mite, fungi, pollen and house dust, have become a subject of discussion. Moreover, asbestos and radon of carcinogen now attract a great deal of attention. Those indoor air pollutants are discussed.

  7. Air Quality Monitoring Programme

    DEFF Research Database (Denmark)

    Kemp, K.; Palmgren, F.

    The air quality in Danish cities has been monitored continuously since 1982 within the Danish Air Quality (LMP) network. The aim has been to follow the concentration levels of toxic pollutants in the urban atmosphere and to provide the necessary knowledge to assess the trends, to perform source...... apportionment, and to evaluate the chemical reactions and the dispersion of the pollutants in the atmosphere. In 2002 the air quality was measured in four Danish cities and at two background sites. NO2 and PM10 were at several stations found in concentrations above the new EU limit values, which the Member...

  8. Mid-air Acrobatics

    Institute of Scientific and Technical Information of China (English)

    LlU FENG'AN

    2011-01-01

    On September 1 two new aerobatic demonstration teams,theSky Wing and the Red Falcon,debuted at an air show held in Changchun,capital of northeast China's Jilin Province.The show was staged at a ceremony held by the Aviation University of the People's Liberation Army (PLA) Air Force.Also performing at the show was the 50-year-old Bayi aerobatic demonstration team.The teams demonstrated their superlative flying skills,which showcase the quality of the air force's rigorous pilot training.

  9. Epitaxial growth of Al/Al2O3 multilayer structures

    International Nuclear Information System (INIS)

    In order to obtain Al-Al2O3 quantum effect devices, it is necessary to deposit epitaxially Al on Al2O3 and Al2O3 on Al. We have already obtained an epitaxial Al/Al2O3/Al structures on Si(111). In this paper, we have deposit Al/Al2O3/Al structures on Si(111), and investigated the crystallinity by using RBS. (author)

  10. Ambient Air Quality Data Inventory

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Office of Air and Radiation's (OAR) Ambient Air Quality Data (Current) contains ambient air pollution data collected by EPA, other federal agencies, as well as...

  11. Ambient Air Quality Data Inventory

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Office of Air and Radiation??s (OAR) Ambient Air Quality Data (Current) contains ambient air pollution data collected by EPA, other federal agencies, as well as...

  12. Introduction to Indoor Air Quality

    Science.gov (United States)

    ... US Environmental Protection Agency Search Search Indoor Air Quality (IAQ) Share Facebook Twitter Google+ Pinterest Contact Us ... Indoor Air Quality An Introduction to Indoor Air Quality IAQ & Health Causes of IAQ Problems Identifying IAQ ...

  13. Emission Facilities - Air Emission Plants

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — Represents the Primary Facility type Air Emission Plant (AEP) point features. Air Emissions Plant is a DEP primary facility type related to the Air Quality Program....

  14. Air Quality Guide for Ozone

    Science.gov (United States)

    Local Air Quality Conditions Zip Code: State : My Current Location Air Quality Guide for Ozone Ground-level ozone is one of our nation’s most common air pollutants. Use the chart below to help reduce ...

  15. Effect of AlN Particulate Size on Superplasticity of AlNp/6061 Al Composites

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Superplastic tensile tests of AlNp/606l Al Composites, fabricated by powder metallurgy techniques, were performed at strain rates ranging from 10-1-10-3S-1 and at temperatures from 833 to 893 K. Hot rolling after extrusion was employed to obtain a fine grained structure before \\superplastic testing. The superplastic behavior of AlNp/6061 Al Composites was compared with that of AlN particulate size. Differential scanning calorimeter was used to ascertain the possibility of any partial melting in the vicinity of optimum superplastic temperatures.

  16. Comment on Japanese Detection of Air Fluorescence Light from a Cosmic Ray Shower in 1969

    CERN Document Server

    Dawson, Bruce R

    2011-01-01

    We examine the claim made by Hara et al. in 1969 of the observation of a 10^19 eV cosmic ray extensive air shower using the air fluorescence technique. We find that it is likely that fluorescence light was observed, confirming this as the first such observation. The work of Hara et al. and their friendly competitors at Cornell University paved the way for modern experiments like the Pierre Auger Observatory and the Telescope Array.

  17. Transportation and Air Quality

    Science.gov (United States)

    ... factors research. - Modeling & Inventories - Testing & Measuring Emissions - Clean Automotive Technologies - Emission Factors Research This page is maintained by EPA's Office of Transportation and Air Quality (OTAQ) . For more: About Us | Get E-mail ...

  18. Air transportation energy efficiency

    Science.gov (United States)

    Williams, L. J.

    1977-01-01

    The energy efficiency of air transportation, results of the recently completed RECAT studies on improvement alternatives, and the NASA Aircraft Energy Efficiency Research Program to develop the technology for significant improvements in future aircraft were reviewed.

  19. Criteria Air Emissions Trends

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Air Emissions Trends site provides national trends of criteria pollutant and precursor emissions data based on the the National Emissions Inventory (NEI) from...

  20. Upswing for hot air

    Energy Technology Data Exchange (ETDEWEB)

    Banse, Stephanie

    2010-07-01

    Optimism reigns in the air collector sector. The market is characterised by high growth rates and numerous new entrants: reason enough to present the sector on its own world map for the first time. (orig.)

  1. Regional Air Quality Data

    Data.gov (United States)

    U.S. Environmental Protection Agency — This asset provides data on regional air quality, including trace level SO2, nitric acid, ozone, carbon monoxide, and NOy; and particulate sulfate, nitrate, and...

  2. Radioactive air sampling methods

    CERN Document Server

    Maiello, Mark L

    2010-01-01

    Although the field of radioactive air sampling has matured and evolved over decades, it has lacked a single resource that assimilates technical and background information on its many facets. Edited by experts and with contributions from top practitioners and researchers, Radioactive Air Sampling Methods provides authoritative guidance on measuring airborne radioactivity from industrial, research, and nuclear power operations, as well as naturally occuring radioactivity in the environment. Designed for industrial hygienists, air quality experts, and heath physicists, the book delves into the applied research advancing and transforming practice with improvements to measurement equipment, human dose modeling of inhaled radioactivity, and radiation safety regulations. To present a wide picture of the field, it covers the international and national standards that guide the quality of air sampling measurements and equipment. It discusses emergency response issues, including radioactive fallout and the assets used ...

  3. Indoor air pollution

    International Nuclear Information System (INIS)

    Although official efforts to control air pollution have traditionally focused on outdoor air, it is now apparent that elevated contaminant concentrations are common inside some private and public buildings. Concerns about potential public health problems due to indoor air pollution are based on evidence that urban residents typically spend more than 90 percent of their time indoors, concentrations of some contaminants are higher indoors than outdoors, and for some pollutants personal exposures are not characterized adequately by outdoor measurements. Among the more important indoor contaminants associated with health or irritation effects are passive tobacco smoke, radon decay products, carbon monoxide, nitrogen dioxide, formaldehyde, asbestos fibers, microorganisms and aeroallergens. Efforts to assess health risks associated with indoor air pollution are limited by insufficient information about the number of people exposed, the pattern and severity of exposures, and the health consequences of exposures. An overall strategy should be developed to investigate indoor exposures, health effects, control options, and public policy alternatives

  4. Indoor air quality

    International Nuclear Information System (INIS)

    Rising energy prices, among other factors, have generated an incentive to reduce ventilation rates and thereby reduce the cost of heating and cooling buildings. Reduced ventilation in buildings may significantly increase exposure to indoor air pollution and perhaps have adverse effects on occupant health and comfort. Preliminary findings suggest that reduced ventilation may adversely affect indoor air quality unless appropriate control strategies are undertaken. The strategies used to control indoor air pollution depend on the specific pollutant or class of pollutants encountered, and differ somewhat depending on whether the application is to an existing building or a new building under design and construction. Whenever possible, the first course of action is prevention or reduction of pollutant emissions at the source. In most buildings, control measures involve a combination of prevention, removal, and suppression. Common sources of indoor air pollution in buildings, the specific pollutants emitted by each source, the potential health effects, and possible control techniques are discussed

  5. Air Data Calibration Facility

    Data.gov (United States)

    Federal Laboratory Consortium — This facility is for low altitude subsonic altimeter system calibrations of air vehicles. Mission is a direct support of the AFFTC mission. Postflight data merge is...

  6. Hot Air Engines

    OpenAIRE

    P. Stouffs

    2011-01-01

    Invented in 1816, the hot-air engines have known significant commercial success in the nineteenth century, before falling into disuse. Nowadays they enjoy a renewed interest for some specific applications. The "hot-air engines" family is made up of two groups: Stirling engines and Ericsson engines. The operating principle of Stirling and Ericsson engines, their troubled history, their advantages and their niche applications are briefly presented, especially in the field of...

  7. Air Distribution in Rooms

    DEFF Research Database (Denmark)

    Nielsen, Peter V.

    The research on air distribution in rooms is often done as full-size investigations, scale-model investigations or by Computational Fluid Dynamics (CFD). New activities have taken place within all three areas and this paper draws comparisons between the different methods. The outcome of the l......EA sponsored research "Air Flow Pattern within Buildings" is used for comparisons in some parts of the paper because various types of experiments and many countries are involved....

  8. Nuclear air cushion vehicles.

    Science.gov (United States)

    Anderson, J. L.

    1973-01-01

    This paper serves several functions. It identifies the 'state-of-the-art' of the still-conceptual nuclear air cushion vehicle, particularly the nuclear powerplant. Using mission studies and cost estimates, the report describes some of the advantages of nuclear power for large air cushion vehicles. The paper also summarizes the technology studies on mobile nuclear powerplants and conceptual ACV systems/missions studies that have been performed at NASA Lewis Research Center.

  9. Air gun test facility

    International Nuclear Information System (INIS)

    This paper describes a facility that is potentially useful in providing data for models to predict the effects of nuclear explosions on cities. IIT Research Institute has a large air gun facility capable of launching heavy items of a wide variety of geometries to velocities ranging from about 80 fps to 1100 fps. The facility and its capabilities are described, and city model problem areas capable of investigation using the air gun are presented

  10. Editorial: Cartas al Editor

    Directory of Open Access Journals (Sweden)

    Guillermo Llanos

    2006-06-01

    Full Text Available En todas las revistas biomédicas del mundo existe una sección habitual denominada como el título de este editorial y que en Colombia Médica la llamamos correspondencia. Este espacio tiene como objetivo fundamental que los lectores escriban a los autores (investigadores comentando los artículos que se han publicado en números anteriores de la revista. Las cartas son, entonces, breves comentarios de desacuerdo o acuerdo (conceptual, metodológico, interpretativo sobre falencias ubicadas por un lector alerta al tema debatido en cualquiera de las secciones como en los artículos originales, editoriales, revisiones, presentación de casos, etc. publicados previamente en la revista. Las cartas deben permitir el intercambio de opiniones y formas de pensar y analizar los problemas planteados entre los autores y los lectores. En ocasiones una serie de cartas motivadas por un artículo original puede ser tan o más interesante como el artículo que generó la correspondencia. Las cartas son también un formato adecuado para comunicar un hecho novedoso de una observación clínica juiciosa no descrita antes. Un ejemplo de ello es la carta de un gineco-obstetra australiano cuando informó a Lancet los primeros efectos adversos informados de la talidomida. Colombia Médica, a pesar de mantener vigente esta sección, no ha sido muy afortunada en establecer una buena cultura del envío de cartas al editor. Pero últimamente han llegado juiciosas observaciones a las cuales se les ha dado prioridad en su publicación. Toda carta que comenta los hallazgos de un artículo es enviada a los autores para su respuesta, porque ello genera el debate académico buscado, y luego se publican, tanto la carta como su respuesta. El Estilo Vancouver recomienda que la carta y su respuesta deban ser breve, no pasar de dos o tres párrafos y contener sólo cuatro o cinco referencias. En lo posible (a menos que sea indispensable no presentar ni cuadros ni gráficos. El t

  11. Malamih al-Ashwat al-'Arabiyyah wa Makharijaha

    Directory of Open Access Journals (Sweden)

    Amrah Muhammad Kasim

    2015-12-01

    Full Text Available This writing discusses on al-ashwat al-‘arabiyyah that is known with “phonetic” term. It talks and interprets makharij al-huruf or place for producing sounds and also processing production of sounds by parts of mouth in Arabic language. The problems of sounds and its systems in Arabic language have been conducted by the scholars of al-ashwat al-‘arabiyyah attractively, neatly, and detail and gotten ahead the phonetic western scholars. Part of their analysis results formulate the study about al-ashwat al-sakinah (al-Shamit is known with vocal and consonant sounds in research questions shawait – shawamit. Ibnu Jinni has formulated “harakat”(wowel in Arabic language and dimension of letter  mad and liyn on alif  letter - waw - ya’ (ا و ي, from these letters create  harakat fathah, dammah, and kasrah. Moreover, in this writing also exist the description of hija’i letters and its makhraj that are correct from parts of mouth and the unity of coordinative sounds that produce sounds in morphemes arrangement, in one word that produces meaning. The result of phonological study has divided al-ashwat to be kinds of sound like the pronounced sounds, produced sounds from mouth, and heard sound.

  12. Canada's Clean Air Act

    International Nuclear Information System (INIS)

    This paper provided an outline of Canada's Clean Air Act and examined some of the regulatory changes that will occur as a result of its implementation. The Act is being introduced to strengthen the legislative basis for taking action on reducing air pollution and GHGs, and will allow the government to regulate both indoor and outdoor air pollutants and GHGs. The Act will require the Ministers of the Environment and Health to establish national air quality objectives, as well as to monitor and report on their attainment. The Canadian Environmental Protection Act will be amended to enable the government to regulate the blending of fuels and their components. The Motor Vehicle Fuel Consumption Standards Act will also be amended to enhance the government's authority to regulate vehicle fuel efficiency. The Energy Efficiency Act will also be expanded to allow the government to set energy efficiency standards and labelling requirements for a wider range of consumer and commercial products. The Act will commit to short, medium and long-term industrial air pollution targets. Regulations will be proposed for emissions from industry; on-road and off-road vehicles and engines; and consumer and commercial products. It was concluded that the Government of Canada will continue to consult with provinces, territories, industries and Canadians to set and reach targets for the reduction of both indoor and outdoor air pollutants and GHG emissions. 6 figs

  13. La responsabilidad cívica frente al ambiente

    OpenAIRE

    Velásquez Barrero, Luz Stella

    1990-01-01

    Dos puntos de vista opuestos caracterizaron por mucho tiempo la concepción de la relación HOMBRE-MEDIO AMBIENTE. Por un lado, la concepción Antropocéntrica según el HOMBRE es AMO y REY de la Naturaleza, ella , esta puesta a su servicio y le pertenece por derecho propio para mantenimiento de la civilización. Por otro lado, la concepción Conservacionista respondiendo a una óptica fundamentalmente Biológica que punta hacia la supervivencia de la vida orgánica y por tanto de la humanidad, argum...

  14. Moisture correspondence between lower and upper troposphere over oceans using AIRS observations

    Science.gov (United States)

    Ye, Hengchun; Fetzer, E. J.; Granger, S.; Lee, S. -Y.; Olsen, E. T.; Lambridgtsen, B. H.; Chen, L.

    2006-01-01

    The Atmospheric Infrared Sounder (AIRS) mounted on Aqua space craft measures vertical profiles of air temperature and humidity using both microwaves and infrared irradiance. The AIRS' level III data that provide gridded values of 1(sup o) latitude by 1(sup o) longitude for the highest temporal resolution of twice per day became available recently (Granger et al. 2005). This level III data were derived from the level II Version 4.0 AIRS retrieval algorithm. This study uses this level III AIRS moisture profile data to reveal geographical correspondences of atmospheric moisture content between the lower and upper troposphere.

  15. Si-Al-Ir Oxidation Resistant Coating for Carbon/Carbon Composites by Slurry Dipping

    Institute of Scientific and Technical Information of China (English)

    Min Huang; Kezhi Li; Hejun Li; Qiangang Fu; Yu Wang

    2009-01-01

    A Si-Al-Ir oxidation resistant coating was prepared for SiC coated carbon/carbon composites by slurry dipping.The phase composition, microstructure and oxidation resistance of the as-prepared Si-Al-Ir coating were studied by XRD (X-ray diffraction), SEM (scanning electron microscopy), and isothermal oxidation test at 1773 K in air, respectively.The surface of the as-prepared Si-Al-Ir coating was dense and the thickness was approximately 100/μm.Its anti-oxidation property was superior to that of the inner SiC coating.The weight loss of SiC/Si-Al-Ir coated carbon/carbon composites was less than 5 wt.pct after oxidation at 1773 K in air for 79 h.The local oxidation defects in the coating may result in the failure of the SiC/Si-Al-Ir coating.

  16. AL-IZDIWAJIYYAH AL-LUGHOWIYAH FII ISTIHDHAMI AL-LUGHOH AL-‘ARABIYAH

    Directory of Open Access Journals (Sweden)

    Imam Muslimin

    2011-10-01

    Full Text Available Al-Izdiwajiyyah (diglosia is standardizing a specific language when there are two variants of language that live side by side in societal life and each variant has its own social function. Disglosia is related to the use of local languages variations of low language and high language in a community. In Arabic language, disglosia covers dialects among the speakers, for instance there are two variants of language that each has roles and functions. The use of the variant depends on the situation. The most important characteristic of diglosia is specifying the functions of wach language variant. For high level language variant is aimed for formal situations such as religious ceremony, lectures, news, or editorials of newspaper. On the contrary, the low level language variant is commonly used in less formal situation such as daily communication in the family, chat with friends, stories in radion, and folk literature. In Arabic language, diglosia can be identified when the speaker of the language use diction commonly used for daily communication (amiyah in a formal expression (fusha, and vice versa.

  17. Microstructure of MCMgAl12Zn1 magnesium alloy

    OpenAIRE

    Dobrzański L.A.; Tański T.; Čížek L.

    2007-01-01

    In this paper is presented the structure of the cast magnesium alloys as cast state and after heat treatment cooled with different cooling rate, depending on the cooling medium (furnace, water, air). For investigations samples in shape of 250x150x25 mm plates were used. The structure have been study in the light microscope, scanning electron microscope equipped with an electron back scattering facility. The effects of the addition of Al on the microstructure were also studied. In the analysed...

  18. Clean air Hamilton

    Energy Technology Data Exchange (ETDEWEB)

    McCarry, B.E. [McMaster Univ., Hamilton, ON (Canada)

    2002-07-01

    The industrial City of Hamilton is located on Lake Ontario, downwind from the Ohio Valley. The Hamilton Air Quality Initiative (HAQI) was divided in several phases, one of which is Clean Air Hamilton. This most recent phase was described in this presentation. Two major goals of this phase were: to ensure that the City of Hamilton has the best air quality of any major urban area in Ontario, and to reduce the emissions of greenhouse gases by 20 per cent compared to the levels in 1990. There were five main objectives to this initiative, namely: (1) the identification of priority air quality issues, (2) achieving an understanding of air quality issues, (3) the identification of sources, the evaluation of impacts and the recommendation of solutions, (4) the assessment of human health, and (5) the identification of further research. The reduction of air quality impacts is progressing through the support provided to the Drive Clean Program, the discouragement of vehicle idling, the support to car pooling initiatives, and the promotion of green vehicles. The implementation of pollution control technologies is taking place on the industrial side, as well as the development of plans to reduce steel industry emissions, the development of energy conservation measures and the promotion of green building practices. Efforts are being deployed over fleet greening partnerships, community tree planting program, an international air conference, an electronic information network linking the United States and the communities of Southern Ontario, a road dust study, a truck emissions research project, the assessment of human health impacts, and finally methods for the monitoring of local improvements. figs.

  19. 76 FR 5609 - Notice of Proposed Consent Decree Under the Clean Air Act

    Science.gov (United States)

    2011-02-01

    ... of Proposed Consent Decree Under the Clean Air Act Notice is hereby given that on January 26, 2011, a... United States et al. v. HOVENSA L.L.C., Civil Action No. 1:11-cv-6. The Consent Decree in this Clean Air... Agency, asserted in a complaint filed together with the Consent Decree, under section 113(b) of the...

  20. 75 FR 18239 - Notice of Proposed Consent Decree Under the Clean Air Act

    Science.gov (United States)

    2010-04-09

    ... of Proposed Consent Decree Under the Clean Air Act Notice is hereby given that on March 31, 2010, two proposed Consent Decrees were lodged. United States et al. v. Shell Chemical LP, Civil Action No. 4:10-cv... District Court for the District of Puerto Rico. The Consent Decrees in these Clean Air Act...

  1. Al versus Si competition in FeSiAl alloys

    Energy Technology Data Exchange (ETDEWEB)

    Legarra, E. [Dpto. Electricidad y Electronica, Facultad de Ciencia y Tecnologia, Universidad del Pais Vasco (UPV/EHU), CP 644, 48080 Bilbao (Spain)], E-mail: estibaliz.legarra@ehu.es; Apinaniz, E. [Dpto. Fisica Aplicada I, Escuela de Ingenieria Tecnica Superior, Universidad del Pais Vasco, Alameda de Urquijo s/n 48013 Bilbao (Spain); Plazaola, F. [Dpto. Electricidad y Electronica, Facultad de Ciencia y Tecnologia, Universidad del Pais Vasco (UPV/EHU), CP 644, 48080 Bilbao (Spain); Jimenez, J.A. [Centro Nacional de Investigaciones Metalurgicas (CENIM), Avda. Gregorio del amo 8, 28040 Madrid (Spain); Pierna, A.R. [Chemical Engineering and Environmental Department, UPV/EHU, Box 1379, 20008 San Sebastian (Spain)

    2008-10-15

    In FeSiAl alloys, when Si substitutes for Al, important changes take place in the magnetism as well as in the structural properties. Alloys in the two composition series Fe{sub 75}Al{sub 25-x}Si{sub x} (x=0, 7.5, 12.5, 17.5, 25) and Fe{sub 70}Al{sub 30-x}Si{sub x} (x=0, 9, 15, 21, 30) were prepared by induction melting; afterwards they were crushed and then annealed in order to recover the DO{sub 3} stable phase. The deformed FeAl samples show larger lattice parameters than the ordered ones; however, this difference ({delta}a) decreases when Si substitutes for Al until it becomes zero (i.e. until the ordered samples and the deformed ones have the same lattice parameters). This trend is the same for both sample series and does not depend on the Fe content of the alloy. However, the magnetization has a different behaviour depending on the Fe content. For deformed Fe{sub 75}Al{sub 25-x}Si{sub x} alloys the saturation magnetization decreases with increasing Si content while for Fe{sub 70}Al{sub 30-x}Si{sub x} deformed alloys the saturation magnetization has a plateau in which the saturation magnetization values do not vary.

  2. Políticas urbanas en Buenos Aires: una mirada etnográfica sobre la producción de complejos habitacionales

    Directory of Open Access Journals (Sweden)

    Ana Gretel Thomasz

    2014-07-01

    Full Text Available En este artículo se exploran las características y particularidades de las políticas urbanas puestas en práctica en la ciudad de Buenos Aires en distintos momentos específicos de su evolución sociohistórica, a fin de concretar el acceso a la vivienda de diversos sectores sociales. Para ello, se examinarán los rasgos principales de los planes y programas habitacionales que dieron origen a dos viviendas de interés social situadas en el sur porteño: el Conjunto Soldati —un gran complejo habitacional edificado en la década del setenta— y el Conjunto Nueva Pompeya —un emprendimiento de menor tamaño construido recientemente—. El artículo se nutre de un trabajo de campo de raíz etnográfica que contempla las prácticas, experiencias y construcciones de sentido de los habitantes de ambos conjuntos.

  3. Identificaciones sexuales politizadas y modos de vida lésbicos: un análisis sobre Cuadernos de Existencia Lesbiana (Buenos Aires, 1987-1996

    Directory of Open Access Journals (Sweden)

    Guido Vespucci

    2015-09-01

    Full Text Available El presente artículo busca analizar el marco interpretativo que produce un grupo de mujeres a través de los Cuadernos de Existencia Lesbiana (Buenos Aires, 1987-1996, una de las primeras publicaciones periódicas destinadas a reflexionar sobre las relaciones sexo-afectivas entre mujeres. Por un lado, se intentará mostrar cómo se construye el lesbianismo como una identidad sexual politizada, mediante la apuesta por comunicar experiencias sexo-afectivas entre mujeres, generar autoconciencia y visibilizarse como mujeres lesbianas. Por otro lado, se exploran los dilemas teóricos y prácticos que emergen en torno a la construcción de un modo de vida lésbico, donde las nociones de amistad, pareja, monogamia, fidelidad, maternidad y familia son puestas en revisión. En ambos ejes se podrá advertir la influencia capital que tuvo la teoría feminista para el cuestionamiento de un orden social-patriarcal que afectaría particularmente las relaciones sexuales, de género y familiares. Así, las críticas a la “heterosexualidad obligatoria” y el “patriarcado” constituyeron claves interpretativas indisociables para intentar construir una identidad y modo de vida lésbico-feminista.

  4. {gamma}-Al{sub 2}O{sub 3} thin film formation via oxidation of {beta}-NiAl(1 1 0)

    Energy Technology Data Exchange (ETDEWEB)

    Zhang Zhongfan, E-mail: zhangzhongfan@gmail.com [Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Li Long; Yang, Judith C. [Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261 (United States); Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA 15261 (United States)

    2011-09-15

    {beta}-NiAl(1 1 0) was oxidized in air for 1-2 h in the temperature range of 650-950 deg. C. The structure and morphology of the oxide films were characterized using a cross-sectional transmission electron microscopy (TEM) method. Only a thin film of aluminum oxide, {gamma}-Al{sub 2}O{sub 3}, was formed. The epitaxial relationship between NiAl and {gamma}-Al{sub 2}O{sub 3} as well as the surface roughness depends on the oxidation temperature. The Nishiyama-Wassermann (NW) orientation relation (OR) between {beta}-NiAl and {gamma}-Al{sub 2}O{sub 3} was noted at an oxidation temperature of 850 deg. C while the Kurdjumov-Sachs (KS) OR was observed at 650 deg. C. The changes in the epitaxial relationship between the {gamma}-Al{sub 2}O{sub 3} film and the NiAl substrate were caused by lattice mismatch-induced strain energy during oxide growth. It was also noted that short time oxidation at T = 750 deg. C created {gamma}' phase precipitates between the NiAl substrate and the {gamma}-Al{sub 2}O{sub 3} film, while oxidation at the higher temperature of 950 deg. C resulted in textured polycrystalline {gamma}-Al{sub 2}O{sub 3} films. The smoothest single crystal epitaxial {gamma}-Al{sub 2}O{sub 3} film formed at an oxidation temperature of 850 deg. C in air.

  5. Air-sea interactions and exchanges

    Digital Repository Service at National Institute of Oceanography (India)

    Naqvi, S.W.A.

    stream_size 29870 stream_content_type text/plain stream_name JGOFS_Rep_35_13.pdf.txt stream_source_info JGOFS_Rep_35_13.pdf.txt Content-Encoding UTF-8 Content-Type text/plain; charset=UTF-8 13 2.3 Air-Sea Interactions...-99) study. This study was conducted as part of the Indian LOICZ (Land-Ocean Interactions in the Coastal Zone) programme (Naqvi et al., 2000). These extreme concentrations are higher than those observed (62.5 nM or 953% saturation) during a more limited...

  6. Undulators at the ALS

    International Nuclear Information System (INIS)

    At Lawrence Berkeley Laboratory's (LBL) Advanced Light Source (ALS), three 4.6 m long undulators have been completed, tested and installed. A fourth is under construction. The completed undulators include two 5.0 cm period length, 89 period devices (U5.0s) which achieve a 0.85 T effective field at a 14 mm minimum gap and a 8.0 cm period length, 55 period device (U8.0) that reaches a 1.2 T effective field at a 14 mm minimum gap. The undulator under construction is a 10.0 cm period length, 43 period device (U10.0) that is designed to achieve 0.98 T at a 23 mm gap. Undulator magnetic gap variation (rms) is within 25 microns over the periodic structure length. Reproducibility of the adjustable magnetic gap has been measured to be within +/- 5 microns. Gap adjusting range is from 14 mm to 210 mm, which can be scanned in one minute. The 5.1 m long vacuum chambers are flat in the vertical direction to within 0.74 mm and straight in the horizontal direction to within 0.08 mm over the 4.6 m magnetic structure sections. Vacuum chamber base pressures after UHV beam conditioning are. in the mid 10-11 Torr range and storage ring operating pressures with full current are in the low 10-10 Torr range. Measurements show that the uncorrelated magnetic field errors are 0.23%, and 0.20% for the two U5.Os and the U8.0 respectively and that the field integrals are small over the 1 cm by 6 cm beam aperture. Device description, fabrication, and measurements are presented

  7. Alexandria (Al Iskandariya), Egypt

    Science.gov (United States)

    2002-01-01

    This image of Alexandria was taken by astronauts on board the International Space Station in December 2000 using an Electronic Still Camera. A wider-angle view (STS088-739-90) taken from the Space Shuttle in December 1998 is available for context. Alexandria (Al Iskandariya) occupies a T-shaped peninsula and strip of land separating the Mediterranean from Lake Mariout. Originally the town was built upon a mole (stone breakwater) called Heptastadium, which joined the island of Pharos (see referenced website, below) to the mainland. Since then sedimentary deposits have widened the mole. Since 1905, when the 370,000 Alexandrians lived in an area of about 4 sq km between the two harbors, the city (population 4 million; see referenced website, below) has grown beyond its medieval walls and now occupies an area of about 300 sq km. The Mahmudiya Canal, connecting Alexandria with the Nile, runs to the south of the city and, by a series of locks, enters the harbor of the principal port of Egypt (note ships). The reddish and ochre polygons west of Lake Mariout are salt-evaporation, chemical-storage, and water-treatment ponds within the coastal lagoon. Reference Youssef Halim and Fatma Abou Shouk, 2000, Human impacts on Alexandria's marine environment: UNESCO, Coastal Regions and Small Islands Unit (CSI), Coastal Management Sourcebooks 2 (accessed December 20, 2000) Additional photographs taken by astronauts can be viewed at NASA-JSC's Gateway to Astronaut Photography of Earth. Image ISS001-ESC-5025 provided by the Earth Sciences and Image Analysis Laboratory, Johnson Space Center.

  8. Model Research On Synthesis Of Al2O3-C Layers By MOCVD

    Directory of Open Access Journals (Sweden)

    Sawka A.

    2015-06-01

    Full Text Available These are model studies whose aim is to obtain information that would allow development of new technology for synthesizing monolayers of Al2O3-C with adjusted microstructure on cemented carbides. The Al2O3-C layer will constitute an intermediate layer on which the outer layer of Al2O3 without carbon is synthesized. The purpose of the intermediate layer is to block the cobalt diffusion to the synthesized outer layer of Al2O3 and to stop the diffusion of air oxygen to the substrate during the synthesis of the outer layer. This layer should be thin, continuous, dense and uniform in thickness.

  9. Computers in Air Defence

    Directory of Open Access Journals (Sweden)

    P. V.S. Rao

    1987-10-01

    Full Text Available With man's mastery over the third dimension - the near atmosphere and space- it has become increasingly necessary to protect oneself not merely from attacks from land and the sea but, more importantly, from attacks from the air. This was recognised even during the World War II and a rudimentary air defence capability was sought to be established; by the manul (visual surveillance and the anti-aircraft guns. The advent of radar signified a major advance in air defence technology and techniques. Rather than depend on visual observation and the hazards and limitations thereof, it became possible with radar to detect the presence of flying objects at much great distances. The PPI display of a conventional air-surveillance radar permits an operator to scan the sky for several hundreds of kilometers all around. Early radar-based air defence systems were dependent on human observation and decision making for detecting targets, identifying them, deciding on interception strategy and for recovering the interceptor after completion of his mission. This was feasible because, with a radar of between 200 to 400 kilometers and aircraft speeds in the range of 500 kilometers per hour, upto 30 minutes warning was available before the target was overhead.

  10. Indoor air pollution

    International Nuclear Information System (INIS)

    Indoor air pollution after being a neglected subject for a number of years, is attracting attention recently because it is a side effect of energy crisis. About 50% of world's 6 billion population, mostly in developing countries, depend on biomass and coal in the form of wood, dung and crop residues for domestic energy because of poverty. These materials are burnt in simple stoves with incomplete combustion and infants, children and women are exposed to high levels of indoor air pollution for a considerable period, approximately between 2-4 hours daily. Current worldwide trade in wood fuel is over US $7 billion and about 2 million people are employed full time in production and marketing it. One of the most annoying and common indoor pollutant in both, developing and developed countries, is cigarette smoke. Children in gas-equipped homes had higher incidences of respiratory disease. Babies' DNA can be damaged even before they are born if their mothers breathe polluted air. Exposure to indoor air pollution may be responsible for nearly 2 million excess deaths in developing countries and for 4% of the global burden of the disease. Only a few indoor pollutants have been studied in detail. Indoor air pollution is a major health threat on which further research is needed to define the extent of the problem more precisely and to determine solutions by the policy-makers instead of neglecting it because sufferers mostly belong to Third World countries. (author)

  11. Infants Can Study Air Science.

    Science.gov (United States)

    Ward, Alan

    1983-01-01

    Provided are activities and demonstrations which can be used to teach infants about the nature of air, uses of air, and objects that fly in the air. The latter include airships, hot-air balloons, kites, parachutes, airplanes, and Hovercraft. (JN)

  12. Selection of Air Terminal Device

    DEFF Research Database (Denmark)

    Nielsen, Peter V.

    This paper discusses the selection of the air terminal device for the experiments and numerical prediction in the International Energy Agency Annex 20 work: Air Flow Pattern within Buildings,......This paper discusses the selection of the air terminal device for the experiments and numerical prediction in the International Energy Agency Annex 20 work: Air Flow Pattern within Buildings,...

  13. El sistema de áreas naturales protegidas y su rol para la conservación del agua : Aproximación al conocimiento de la presencia de diferentes cuerpos de aguas en el Sistema Provincial de Áreas Naturales Protegidas de la provincia de Buenos Aires

    OpenAIRE

    Romero, María Cristina

    2013-01-01

    El Sistema de Áreas Naturales Protegidas de la Provincia de Buenos Aires (SANP) está regulado por la ley 10907 (B.O. 6/6/90) reglamentada por el decreto 218/94 y modificada por la ley 12.459 (B.O. 26/7/2000). El mismo permite la protección de la biodiversidad de los diferentes ecosistemas de la provincia, a través de la conformación de unidades de conservación funcionales (Reservas Naturales), las que nos brindan servicios ambientales para la sociedad, como protección de sectores de cuencas h...

  14. Ocupantes espontáneos y derechos por la tierra en la formación de “pueblos de españoles” (Rincón de San Pedro, Buenos Aires, 1740-1860

    Directory of Open Access Journals (Sweden)

    Mariana Canedo

    2015-01-01

    Full Text Available Durante el siglo XVIII, se multiplicó la presencia de “pueblos de espa-ñoles” y villas en la frontera sur hispanoamericana. El protagonismo de ocupantes rurales en la formación de “pueblos de españoles” fue más frecuente en la campaña de Buenos Aires que en otras jurisdicciones, aunque poco se conoce sobre su proceder. El objetivo del artículo fue analizar las características de los ocupantes rurales y el rango de acción que tuvieron para solicitar el reconocimiento legal de terrenos para la formación de un pueblo en la campaña de Buenos Aires durante el siglo XVIII y parte del XIX. El análisis del caso del pueblo de San Pedro nos permitió profundizar la situación de los “ocupantes” y abrir varios inte-rrogantes sobre la regulación de los derechos por la tierra, particularmen-te sobre los pueblos y villas, en un período que suele estar vinculado a transformaciones en los derechos y en las relaciones de poder ejercidas en su puesta en práctica.

  15. Improvement of the Oxidation Resistance of the Single-Crystal Ni-Based TMS-82+ Superalloy by Ni–Al Coatings with/without the Diffusion Barrier

    NARCIS (Netherlands)

    Wu, Y.; Li, X.W.; Song, G.M.; Wang, Y.M.; Narita, T.

    2010-01-01

    Oxidation behavior of the uncoated base, Ni–Al coated and Re–Cr-Ni plus Ni–Al coated single-crystal (SC) Ni-based TMS-82+ superalloy is studied under cyclic air at 900ºC for 200 h to assess the oxidation resistance. Regardless of the coating processing, Ni–Al coating is effective in improving the ox

  16. Thermal Modeling of Al-Al and Al-Steel Friction Stir Spot Welding

    Science.gov (United States)

    Jedrasiak, P.; Shercliff, H. R.; Reilly, A.; McShane, G. J.; Chen, Y. C.; Wang, L.; Robson, J.; Prangnell, P.

    2016-09-01

    This paper presents a finite element thermal model for similar and dissimilar alloy friction stir spot welding (FSSW). The model is calibrated and validated using instrumented lap joints in Al-Al and Al-Fe automotive sheet alloys. The model successfully predicts the thermal histories for a range of process conditions. The resulting temperature histories are used to predict the growth of intermetallic phases at the interface in Al-Fe welds. Temperature predictions were used to study the evolution of hardness of a precipitation-hardened aluminum alloy during post-weld aging after FSSW.

  17. AirPort Extreme

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    AirPort Extreme是基于IEEE802.11g无线通讯协议的54Mbps的无线路由机站,它提供了比802.11b标准几乎快5倍以上的连接速率。AirPort Extreme基站可以同时为50台Mac和PC机用户服务。它支持从无线打印至带有USB接口或以太网接口的打印机,支持无线桥接技术,并同时提供了一整套强大的管理工具。除此之外,AirPort Extreme基站还配有一个内建防火墙,

  18. Del ideal del ciudadano al ciudadano en-situación: un estudio sobre los modelos de ciudadanía y los posicionamientos subjetivos de jóvenes ciudadanos en la Argentina actual (Buenos Aires y Conurbano, 2011-13

    Directory of Open Access Journals (Sweden)

    Miriam Kriger

    2015-01-01

    Full Text Available El presente trabajo se inserta en el campo de estudios sobre juventud y política, entendida esta última como aspecto clave del vínculo con el "proyecto común" al que los jóvenes se suman formalmente como nuevos ciudadanos. Desde una perspectiva psicosocial y con foco en el contexto contemporáneo argentino, el artículo problematiza la relación entre cómo conciben los jóvenes a "la ciudadanía" en un plano ideal y cómo son sus actitudes como ciudadanos en-situación, con especial interés en las tensiones y articulaciones entre la moral y la política, lo individual y lo social. En esta línea, se presentan y analizan resultados de un estudio realizado en Argentina entre el 2011-3 con jóvenes estudiantes (N=275 en el cual se indaga, por una parte, sus modelos de ciudadanía y, por otra, sus propuestas para abordar la llamada "inseguridad", una problemática percibida por ellos como central y actual, enfrentándolos a una alta conflictividad social. Como resultado, se establecen tres ideal/es de ciudadano (individual, social y político y tres tipos de posicionamiento subjetivo (punitivo, disciplinar y político, que se infieren a partir de sus propuestas para abordar "la inseguridad". Se concluye problematizando y reflexionando sobre la correlación hallada en la mayoría de los participantes entre el ideal individual del ciudadano, con fuerte impronta moral, y el posicionamiento punitivo frente al conflicto, y remarcando la necesidad de trabajar en pos de la incorporación de la dimensión social y política al pensamiento de los jóvenes.

  19. KWIN nu ook als app

    NARCIS (Netherlands)

    Rotgers, G.; Vermeij, I.

    2014-01-01

    KWIN, Kwantitatieve Informatie Veehouderij, verscheen de afgelopen 25 jaar als lijvig handboek, zowel op papier als digitaal. Dit najaar is daar een serie apps bij gekomen, waarmee adviseurs en veehouders zelf saldo- en kostprijsberekeningen kunnen maken. De apps zijn beschikbaar voor de pluimvee-,

  20. Philosophieren als Unterrichtsprinzip im Mathematikunterricht

    Science.gov (United States)

    Meerwaldt, Diana

    Philosophieren und Mathematik scheinen zunächst gegensätzliche Bereiche zu sein, die sich kaum vereinbaren lassen. Dies trifft für eine Auffassung zu, die Philosophieren als "Gerede" disqualifiziert und Mathematik als eine reine "Formelwissenschaft" begreift. Beide Auffassungen werden den Gegenständen nicht gerecht.

  1. The effect of silicon on the oxidation behavior of NiAlHf coating system

    Science.gov (United States)

    Dai, Pengchao; Wu, Qiong; Ma, Yue; Li, Shusuo; Gong, Shengkai

    2013-04-01

    Two types of NiAlHf coatings doped with different content of Si (1 at.% and 2 at.%) were deposited on a Ni3Al based single crystal superalloy IC32 by electron beam physical vapor deposition (EB-PVD) method, respectively. For comparison, NiAlHf coating with 0 at.% Si was also prepared. The oxidation tests were carried out at 1423 K in air. At the initial stage of oxidation, large amount of flake-like θ-Al2O3 was found on NiAlHf coating surface. However, no θ-Al2O3 was observed in 2 at.% Si doped NiAlHf coating except α-Al2O3. It revealed that the Si additions could contribute to the transformation from θ-Al2O3 to α-Al2O3. When oxidation time prolonged to 100 h, it was found that the degradation of NiAlHf coating was very severe with no residual β-phase, which was due to the serious inter-diffusion between the coating and substrate. In contrast, the inter-diffusion in Si-doped coating was reduced with some residual β-phase and R-Ni(Mo, Re) precipitates. The presence of Si could retard the inter-diffusion of elements between coating and substrate, indicating a barrier diffusion effect. As a result, the oxidation resistance of NiAlHf coating was improved significantly.

  2. Elementos facilitadores en la implantación de servicios de telemedicina: Perspectiva de los profesionales implicados en su diseño y puesta en marcha Facilitators in the implantation of telemedicine services: Perspective of professionals involved in its design and implementation

    Directory of Open Access Journals (Sweden)

    F. Roig

    2011-08-01

    Full Text Available Fundamento. Ante las dificultades que encuentra la Telemedicina para su incorporación definitiva a la práctica clínica y ante la falta de evidencia sobre las estrategias de implementación más adecuadas, resulta necesario recoger y difundir el aprendizaje obtenido a partir de la experiencia en su introducción en nuestro sistema de salud. El objetivo del estudio es identificar los elementos facilitadores percibidos por los profesionales que participan en el diseño y puesta en marcha de proyectos de Telemedicina. Métodos. Estudio cualitativo realizado a partir de los datos obtenidos a través de entrevistas semi-estructuradas a 17 informantes clave de diferentes organizaciones del ámbito de la salud en Cataluña. Resultados. Los facilitadores identificados son que el servicio de Telemedicina responda a una necesidad claramente percibida por los profesionales; que el núcleo del liderazgo incorpore a clínicos en un modelo abierto, participativo y flexible que tenga en cuenta las necesidades de los profesionales; que sea capaz de establecer relaciones de colaboración con los diferentes participantes más allá de la del cliente-proveedor; y que incorpore desde el diseño inicial una estrategia para su sostenibilidad y normalización. Conclusiones. Conocer los facilitadores y las barreras que aparecen en el proceso de implantación de TM en las organizaciones sanitarias se convierte en un elemento de alto valor para su introducción definitiva. Un enfoque que combine evidencia sobre eficacia clínica y coste-beneficio con lecciones aprendidas sobre las dinámicas de implementación y normalización permitirá obtener una comprensión global de la adopción de la TM y mejorar su gestión organizativa.Background. Given the difficulties encountered by Telemedicine for final incorporation into clinical practice and given the lack of scientific evidence regarding the most appropriate implementation strategies, it is necessary to collect and

  3. Air the excellent canopy

    CERN Document Server

    Fahy, F

    2013-01-01

    We take it for granted, but without it we perish and if we continue to abuse it, it may kill us in the end. This fascinating text provides an understanding and appreciation of the role that air plays in our environment and its importance in relation to human life and technology. Aimed at those who are scientifically curious but who have no specialist training, it contains no mathematical equations and relies upon the qualitative descriptions and analogies to explain the more technical parts of the text together with simple home experiments to illustrate a range of air-based phenomena. Liberall

  4. 33 CFR 334.1280 - Bristol Bay, Alaska; air-to-air weapon range, Alaskan Air Command, U.S. Air Force.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Bristol Bay, Alaska; air-to-air weapon range, Alaskan Air Command, U.S. Air Force. 334.1280 Section 334.1280 Navigation and Navigable... REGULATIONS § 334.1280 Bristol Bay, Alaska; air-to-air weapon range, Alaskan Air Command, U.S. Air Force....

  5. Nitrogen-doped carbonaceous catalysts for gas-diffusion cathodes for alkaline aluminum-air batteries

    Science.gov (United States)

    Davydova, E. S.; Atamanyuk, I. N.; Ilyukhin, A. S.; Shkolnikov, E. I.; Zhuk, A. Z.

    2016-02-01

    Cobalt tetramethoxyphenyl porphyrin and polyacrylonitrile - based catalysts for oxygen reduction reaction were synthesized and characterized by means of SEM, TEM, XPS, BET, limited evaporation method, rotating disc and rotating ring-disc electrode methods. Half-cell and Al-air cell tests were carried out to determine the characteristics of gas-diffusion cathodes. Effect of active layer thickness and its composition on the characteristics of the gas-diffusion cathodes was investigated. Power density of 300 mW cm-2 was achieved for alkaline Al-air cell with an air-breathing polyacrylonitrile-based cathode.

  6. Exposure to hazardous air pollutants and the risk of amyotrophic lateral sclerosis

    International Nuclear Information System (INIS)

    Background: Amyotrophic lateral sclerosis (ALS) is a serious and rapidly fatal neurodegenerative disorder with an annual incidence of 1–2.6/100,000 persons. Few known risk factors exist although gene–environment interaction is suspected. We investigated the relationship between suspected neurotoxicant hazardous air pollutants (HAPs) exposure and ALS. Methods: A case–control study involving sporadic ALS cases (n = 51) and matched controls (n = 51) was conducted from 2008 to 2011. Geocoded residential addresses were linked to U.S. EPA NATA data (1999, 2002, and 2005) by census tract. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated using conditional logistic regression. Results: Residential exposure to aromatic solvents significantly elevated the risk of ALS among cases compared to controls in 2002 (OR = 5.03, 95% CI: 1.29, 19.53) and 1999 (OR = 4.27, 95% CI: 1.09, 16.79) following adjustment for education, smoking, and other exposure groups. Metals, pesticides, and other HAPs were not associated with ALS. Conclusions: A potential relationship is suggested between residential ambient air aromatic solvent exposure and risk of ALS in this study. - Highlights: • The effects of ambient air pollutants and risk of ALS was assessed. • EPA NATA data linked to geocoded addresses for 1999, 2002, and 2005. • Residential exposure to aromatic solvents was associated with an increased risk of ALS. - Residential exposure to aromatic solvents was associated with an increased risk of ALS

  7. Quantum dots formed in InSb/AlAs and AlSb/AlAs heterostructures

    Science.gov (United States)

    Abramkin, D. S.; Rumynin, K. M.; Bakarov, A. K.; Kolotovkina, D. A.; Gutakovskii, A. K.; Shamirzaev, T. S.

    2016-06-01

    The crystal structure of new self-assembled InSb/AlAs and AlSb/AlAs quantum dots grown by molecularbeam epitaxy has been investigated by transmission electron microscopy. The theoretical calculations of the energy spectrum of the quantum dots have been supplemented by the experimental data on the steady-state and time-resolved photoluminescence spectroscopy. Deposition of 1.5 ML of InSb or AlSb on the AlAs surface carried out in the regime of atomic-layer epitaxy leads to the formation of pseudomorphically strained quantum dots composed of InAlSbAs and AlSbAs alloys, respectively. The quantum dots can have the type-I and type-II energy spectra depending on the composition of the alloy. The ground hole state in the quantum dot belongs to the heavy-hole band and the localization energy of holes is much higher than that of electrons. The ground electron state in the type-I quantum dots belongs to the indirect X XY valley of the conduction band of the alloy. The ground electron state in the type-II quantum dots belongs to the indirect X valley of the conduction band of the AlAs matrix.

  8. El Bienestar Animal aplicado al transporte y la faena para consumo humano. (The animal welfare applied to the transport and the slaughter for consumption.

    Directory of Open Access Journals (Sweden)

    Barros Restano, Alvaro.

    2007-12-01

    Full Text Available ResumenNumerosos trabajos de investigación han demostrado la incidencia sobre la calidad final de la carne del inadecuado manejo de los animales tanto en el transporte omo en la etapa previa a la faena. Personalmente consideramos que es necesario considerar también el trato dado al ganado durante toda su vida y en especial dentro de los 15 a 30 días antes del embarque. Los perjuicios económicos han sidocuantificados ascendiendo a varios millones de dólares en donde interviene el nivel de machucamiento y las pérdidas por carnes con pHu elevado generalmente puestas en evidencia por el color oscuro de las mismas. Los problemas citados son el reflejo de una irresponsable falta de atención al bienestar de los animales. En el presente trabajo se brindan recomendaciones para optimizar la presente situación concretamente en las etapas del transporte y el manejo antemortem en el establecimiento de faena.AbstractVarious research works have demonstrated the effect on the final quality of the meat of the inadequate management of the animals both during the transport and previous to the slaughter. Personally we think that it is necessary to also consider the treatment given to the cattle during all its life and especially during the 15 to 30 days before the shipment. The economic prejudices have been quantified to be several million dollars, where the main causes are the level of bruising and the meats with high pHu generally put in evidence by their dark color. The mentioned problems are the evidence of an irresponsible lack of attention to animal welfare. In the present work recommendations are made in order to optimize the presentsituation particularly in the stages of transportation and antemortem management at the slaughterhouse.

  9. Geografía(s feminista(s: itinerarios y debates por las reflexiones en torno al estudio cultural de las espacialidades

    Directory of Open Access Journals (Sweden)

    Gonzalo Federico Zubia

    2015-06-01

    Full Text Available El hiato cuerpos y espacialidades pone en tensión no solo las coordenadas geográficas, sino también las teóricas que, al fin y al cabo, se constituyen coetáneamente en un mismo proceso epistémico. Este es el punto de intersección en el que convergen dos trayectos de investigación: el estudio de experiencias de mujeres bagayeras en la frontera argentino-boliviana y la erosión de los paisajes culturales tras los desarrollismos contemporáneos. Estos recorridos de investigación no devuelven sino una mirada fractal acerca de las espacialidades que deshacen la cartografía oficial consagrada en el mapa de la nación, para interrogarse por los lugares obliterados en la enunciación del espacio geométrico cuya “neutralidad” es puesta en cuestión. En este contexto, el trabajo se propone (reconstruir una genealogía crítica de los debates acerca de las intersecciones entre geografías y feminismos, tras los giros teóricos de las últimas décadas, para organizar una arquitectura analítica con la que estudiar las excentricidades de los espacios dislocados en su faz cultural. En este recorrido, se repasarán las discusiones que impugnaron y deconstruyeron la especialidad hegemónica de la res extensa del espacio geométrico dando paso a un proyecto político que habilitara modos disidentes de habitar el lugar, a la vez que asumirá la precariedad como forma alegórica de la teoría social.

  10. Hydrolysis of aluminum nitride powders in moist air

    International Nuclear Information System (INIS)

    High thermal conductivity is required for successful application of aluminum nitride (AlN) as a substrate material in electronic devices. AlN powders of low oxygen content are needed since oxygen contamination greatly reduces the thermal conductivity of AlN ceramics. High-purity AlN powders are commercially available, but can be contaminated by oxygen when contacting water/oxygen in powder processing after manufacturing. The present study investigates the hydrolysis properties of AlN powders in moist air at room temperature, so as to understand the degradation phenomena during powder handling in the normal atmospheric environment. The powders investigated were produced via three major commercial processes, namely, chemical vapor deposition from triethyl aluminum, carbothermal reduction and nitridation of alumina, and direct nitridation of aluminum. At the beginning of hydrolysis, an induction period is observed for each powder, which is attributed to slow hydrolysis of the surface oxide/oxyhydroxide layer. The length of this period is thus dependent on the composition and thickness of the surface layer, which is in turn affected by the manufacturing method. The AlN powder produced by the carbothermal process shows the longest induction period. The hydrolysis reaction produces initially amorphous AlOOH, which is further hydrolyzed to mixtures of bayerite, nordstrandite, and gibbsite, forming agglomerates around the unreacted AlN. Copyright (2003) AD-TECH - International Foundation for the Advancement of Technology Ltd

  11. Air Structures: Inflatable Alternatives

    Science.gov (United States)

    Valerio, Joseph M.; And Others

    1973-01-01

    Describes and evaluates several avant garde'' examples of air structures. Included are a soft'' child's playpen, a pneudome that employs a water ballast for anchoring, a one-acre enclosed campus, an instant city'' constructed for an industrial design conference, and the Fuji Pavilion, at Expo '70 in Osaka, Japan, that was large enough to cover…

  12. The cold air machine

    Energy Technology Data Exchange (ETDEWEB)

    Bagcl, Barls [TUV Rheinland Hong Kong Ltd., Emperor International Square, 10/F, 7 Wang Tai Road, Kowloon Bay (Hong Kong)

    2010-07-01

    This study focuses on the human behaviour in regards of air-conditioning usage in indoor environment. A mid-sized, carpet floored office (600 sqm) with 120 employees in Hong Kong was chosen as the experiment field due to two reasons. The first reason is that the office buildings in Hong Kong are the coldest office buildings worldwide. And the building where the office is located doesn't provide a central air-conditioning system, which means that the human behaviour is very crucial to save energy in such offices. The second reason is that the largest portion of electricity consumption in Hong Kong belongs to the air-conditioning systems in buildings (25% of total electricity consumption in Hong Kong). Development and usage of energy efficient technologies are no doubt very crucial in emission reduction and environmental protection. But, the best energy efficient equipment is not much worth and waste of money if the behaviour of the persons using that equipment does not change. In this study we searched for the reasons behind the persistent behaviour of wrongly using the air conditioning systems and making Hong Kong probably the city with the largest energy consumption for cooling per square meter.

  13. The cold air machine

    Directory of Open Access Journals (Sweden)

    Barış Bağcı

    2010-03-01

    Full Text Available This study focuses on the human behaviour in regards of air-conditioning usage in indoor environment. A mid-sized, carpet floored office (600 sqm with 120 employees in Hong Kong was chosen as the experiment field due to two reasons. The first reason is that the office buildings in Hong Kong are the coldest office buildings worldwide. And the building where the office is located doesn’t provide a central air-conditioning system, which means that the human behaviour is very crucial to save energy in such offices. The second reason is that the largest portion of electricity consumption in Hong Kong belongs to the air-conditioning systems in buildings (25% of total electricity consumption in Hong Kong. Development and usage of energy efficient technologies are no doubt very crucial in emission reduction and environmental protection. But, the best energy efficient equipment is not much worth and waste of money if the behaviour of the persons using that equipment does not change. In this study we searched for the reasons behind the persistent behaviour of wrongly using the air conditioning systems and making Hong Kong probably the city with the largest energy consumption for cooling per square meter.

  14. Images in the Air

    Science.gov (United States)

    Riveros, H. G.; Rosenberger, Franz

    2012-01-01

    This article discusses two "magic tricks" in terms of underlying optical principles. The first trick is new and produces a "ghost" in the air, and the second is the classical real image produced with two parabolic mirrors. (Contains 2 figure and 6 photos.)

  15. Air Quality Monitoring Programme

    DEFF Research Database (Denmark)

    Kemp, K.; Palmgren, F.

    The Danish Air Quality Monitoring Programme (LMP IV) has been revised in accordance with the Framework Directive and the first three daughter directives of SO2, NOx/NO2, PM10, lead, benzene, CO and ozone. PM10 samplers are under installation and the installation will be completed during 2002...

  16. Indoor Air Quality

    DEFF Research Database (Denmark)

    Selman, Ayser Dawod; Heiselberg, Per

    Overall purpose of the research is to provide an overview of the relevance and importance of various defined Indoor Air Quality (IAQ) parameters in a European perspective. Based on the report it should be possible to prioritize which countries to target for further activities as well as it should...

  17. Fast Air Temperature Sensors

    DEFF Research Database (Denmark)

    Hendricks, Elbert

    1998-01-01

    The note documents briefly work done on a newly developed sensor for making fast temperature measurements on the air flow in the intake ports of an SI engine and in the EGR input line. The work reviewed has been carried out in close cooperation with Civ. Ing. Michael Føns, the author (IAU...

  18. Mid-air Acrobatics

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Two new aerobatic demonstration teams take to the skies On September 1,two new aerobatic demonstration teams,the Sky Wing and the Red Falcon,debuted at an air show held in Changchun,capital of northeast China’s Jilin Province.

  19. Hexane Air Combustion

    CERN Document Server

    Boettcher, Philipp A; Shepherd, Joseph E

    2010-01-01

    Hot surface ignition and subsequent flame propagation of premixed n-hexane air mixtures are shown in this fluid dynamics video. High speed schlieren photography revealed 3 distinct behaviors of ignition and propagation as a function of mixture composition and initial pressure.

  20. Russia air management program

    Energy Technology Data Exchange (ETDEWEB)

    Pace, T.G. [U.S. Environmental Protection Agency, NC (United States); Markin, S. [Ministry of Environmental Protection and Natural Resources, Moscow (Sweden); Kosenkova, S.V. [Volgograd Environmental Services Administration, Volgograd (Russian Federation)

    1995-12-31

    The Russia Air Management Program is in the second year of a four-year cooperative program between the Russian Ministry of Environmental Protection and Natural Resources (MEPNR) and the U.S. Environmental Protection Agency (EPA) to improve national institutions, policies, and practices for air quality management in Russia. This program is part of the Environmental Policy and Technology project being conducted by the U.S. Agency for International Development. The Russia Air Management Program will pilot the application of potential air program improvements in the important industrial City of Volgograd which will enable the development, practical demonstration and evaluation of alternative approaches for improving AQM policies and practices in Russia. Volgograd has a progressive and environmentally enlightened local government, a diverse industrial base and a relatively healthy economy. It is located south of Moscow on the Volga River and was proposed by the Ministry of Environmental Protection and Natural Resources. It was selected after a site visit and a series of discussions with the Ministry, Volgograd officials, the World Bank and the EPA. Following the pilot, RAMP will work to facilitate implementation of selected parts of the pilot in other areas of Russia using training, technology transfer, and public awareness. (author)

  1. Learning AirWatch

    CERN Document Server

    Dunkerley, Mark

    2015-01-01

    If you are a technical professional who wants to dive deeper into the functionality offered by AirWatch or manage the solution, then this book will help you choose the best set of configuration, device management, and monitoring options that you can use to effectively manage your EMM implementation.

  2. Air movement - good or bad?

    DEFF Research Database (Denmark)

    Toftum, Jørn

    2004-01-01

    Air movement - good or bad? The question can only be answered by those who are exposed when they are exposed. Human perception of air movement depends on environmental factors including air velocity, air velocity fluctuations, air temperature, and personal factors such as overall thermal sensation...... and activity level. Even for the same individual, sensitivity to air movement may change from day to day as a result of e.g. different levels of fatigue. Based on existing literature, the current paper summarizes factors influencing the human perception of air movement and attempts to specify in general terms...... influences the subjective perception of air movement. With occupants feeling warmer than neutral, at temperatures above 23oC or at raised activity levels, humans generally do not feel draught at air velocities typical for indoor environments (up to around 0.4 m/s). In the higher temperature range, very high...

  3. The battery as a thermal storage. Impacts on the air conditioning of interior spaces, the thermal architecture and the operation strategy of electric-powered vehicles; Die Batterie als thermischer Speicher. Auswirkungen auf die Innenraumklimatisierung, die thermische Architektur und die Betriebsstrategie von Elektrofahrzeugen

    Energy Technology Data Exchange (ETDEWEB)

    Bouvy, Claude [Forschungsgesellschaft Kraftfahrwesen mbH, Aachen (Germany); Jeck, Peter; Gissing, Joerg; Lichius, Thomas; Baltzer, Sidney; Eckstein, Lutz [RWTH Aachen Univ. (Germany). Inst. fuer Kraftfahrzeuge

    2012-11-01

    In this paper the use of the electric traction battery as a thermal storage unit is analysed by means of simulations. The stored thermal energy is exclusively used in this work to heat the passenger cabin. For this scenario two alternative concepts are being compared to a conventional operational mode, without the use of the battery as a thermal storage. On the one hand the stored heat is directly used for cabin heating with an liquid/air heat exchanger. On the other hand a heat pump raises the temperature level. First the holistic modeling approach and the detailed architectures are presented. Then these models are simulated for a winter scenario and the results are discussed. (orig.)

  4. A study of Cu/ZnO/Al2O3 methanol catalysts prepared by flame combustion synthesis

    DEFF Research Database (Denmark)

    Jensen, Joakim Reimer; Johannessen, Tue; Wedel, Stig;

    2003-01-01

    The flame combustion synthesis of Cu/ZnO/Al2O3 catalysts for the synthesis of methanol from CO, CO2 and H2 is investigated. The oxides are generated in a premixed flame from the acetyl-acetonate vapours of Cu, Zn and Al mixed with the fuel and air prior to combustion. The flame-generated powder...

  5. Air-Coupled Vibrometry

    Science.gov (United States)

    Döring, D.; Solodov, I.; Busse, G.

    Sound and ultrasound in air are the products of a multitude of different processes and thus can be favorable or undesirable phenomena. Development of experimental tools for non-invasive measurements and imaging of airborne sound fields is of importance for linear and nonlinear nondestructive material testing as well as noise control in industrial or civil engineering applications. One possible solution is based on acousto-optic interaction, like light diffraction imaging. The diffraction approach usually requires a sophisticated setup with fine optical alignment barely applicable in industrial environment. This paper focuses on the application of the robust experimental tool of scanning laser vibrometry, which utilizes commercial off-the-shelf equipment. The imaging technique of air-coupled vibrometry (ACV) is based on the modulation of the optical path length by the acoustic pressure of the sound wave. The theoretical considerations focus on the analysis of acousto-optical phase modulation. The sensitivity of the ACV in detecting vibration velocity was estimated as ~1 mm/s. The ACV applications to imaging of linear airborne fields are demonstrated for leaky wave propagation and measurements of ultrasonic air-coupled transducers. For higher-intensity ultrasound, the classical nonlinear effect of the second harmonic generation was measured in air. Another nonlinear application includes a direct observation of the nonlinear air-coupled emission (NACE) from the damaged areas in solid materials. The source of the NACE is shown to be strongly localized around the damage and proposed as a nonlinear "tag" to discern and image the defects.

  6. Stress Development and Relaxation in Al2O3 during Early Stage Oxidation of β-NiAl

    International Nuclear Information System (INIS)

    Using a glancing synchrotron X-ray beam (Advanced Photon Source, Beamline 12BM, Argonne National Laboratory), Debye-Scherrer diffraction patterns from thermally grown oxides on NiAl samples were recorded during oxidation at 1000 or 1100 C in air. The diffraction patterns were analyzed to determine strain and phase changes in the oxide scale as it developed and evolved. Strain was obtained from measurements of the elliptical distortion of the Debye-Scherrer rings, where data from several rings of a single phase were used. Results were obtained from α-Al2O3 as well as from the transition alumina, in this case θ-Al2O3, which formed during the early stage. Compressive stress was found in the first-formed transition alumina, but the initial stress in α-Al2O3 was tensile, with a magnitude high enough to cause Al2O3 fracture. New α-Al2O3 patches nucleated at the scale/alloy interface and spread laterally and upward. This transformation not only puts the alpha alumina in tension, but can also cause the transition alumina to be in tension. After a complete α-Al2O3 layer formed at the interface, the strain level in α-Al2O3 became compressive, reaching a steady state level around -75 MPa at 1100 C. To study a specimen's response to stress perturbation, samples with different thickness, after several hours of oxidation at 1100 C, were quickly cooled to 950 C to impose a compressive thermal stress in the scale. The rate of stress relaxation was the same for 1 and 3.5 mm thick samples, having a strain rate of ∼ 1 x 10-8/s. This behavior indicates that oxide creep is the major stress relaxation mechanism

  7. Molecular Air Data Clear Air Turbulence Sensor: MADCAT Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Clear air turbulence (CAT), often referred to as "air pockets," is attributed to Kelvin-Helmholtz instabilities at altitudes generally above 18,000ft, often in the...

  8. Molecular Air Data Clear Air Turbulence Sensor: MADCAT Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Clear air turbulence (CAT), often referred to as "air pockets," is attributed to Kelvin-Helmholtz instabilities at altitudes usually above 18,000ft, often without...

  9. Consoer et al PFOS dataset

    Data.gov (United States)

    U.S. Environmental Protection Agency — This ScienceHub entry was developed for the published paper: Consoer et al., 2016, Toxicokinetics of perfluorooctane sulfonate in rainow trout (Oncorhynchus...

  10. EKSKURSO AL CANGYAN-MONTO

    Institute of Scientific and Technical Information of China (English)

    Verkita; de; Li; Shijun

    1999-01-01

    La Pekina Esperanto-Asocio preskaǚ sta-rigis tradicion organizi ekskurson printempe kajaǚtune. En la pasinta jaro, ni ekskursis al In-terna Mongolio kaj habis agrablajn renkontiojnkun geesperantistoj en Huhehot kaj Baotou. i-

  11. DESAFÍOS AL ORDEN

    Directory of Open Access Journals (Sweden)

    Evangelina De los Rios

    2012-03-01

    Full Text Available Fradkin, Raúl y Gelman, Jorge (Compiladores, Desafíos al Orden. Política y sociedades rurales durante la Revolución de Independencia, Prohistoria ediciones, Rosario, 2008, 157 pp.

  12. Information als Gegenstand von Informationskompetenz

    OpenAIRE

    Ingold, Marianne

    2011-01-01

    Der Informationsbegriff als zentraler Gegenstand von Informationskompetenz wird in der bibliothekarischen Diskussion in der Regel nicht explizit thematisiert, sondern lässt sich aus Fachliteratur und Bibliothekspraxis nur implizit erschließen. Eine theoretische Beschäftigung mit dem Informationsbegriff ist jedoch unabdingbar, soll das Konzept "Informationskompetenz" auch außerhalb des bibliothekarischen Kontextes verständlich und nutzbar gemacht werden. Im vorliegenden Text, der sich als Beit...

  13. Properties of air and combustion products of fuel with air

    Science.gov (United States)

    Poferl, D. J.; Svehla, R. A.

    1975-01-01

    Thermodynamic and transport properties have been calculated for air, the combustion products of natural gas and air, and combustion products of ASTM-A-1 jet fuel and air. Properties calculated include: ratio of specific heats, molecular weight, viscosity, specific heat, thermal conductivity, Prandtl number, and enthalpy.

  14. A Breath of Fresh Air: Addressing Indoor Air Quality

    Science.gov (United States)

    Palliser, Janna

    2011-01-01

    Indoor air pollution refers to "chemical, biological, and physical contamination of indoor air," which may result in adverse health effects (OECD 2003). The causes, sources, and types of indoor air pollutants will be addressed in this article, as well as health effects and how to reduce exposure. Learning more about potential pollutants in home…

  15. Oxidation behavior of arc evaporated Al-Cr-Si-N thin films

    Energy Technology Data Exchange (ETDEWEB)

    Tritremmel, Christian; Daniel, Rostislav; Mitterer, Christian; Mayrhofer, Paul H.; Lechthaler, Markus; Polcik, Peter [Christian Doppler Laboratory for Advanced Hard Coatings, Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Franz-Josef-Strasse 18, A-8700 Leoben (Austria); Christian Doppler Laboratory for Application Oriented Coating Development, Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Franz-Josef-Strasse 18, A-8700 Leoben (Austria); OC Oerlikon Balzers AG, Iramali 18, LI-9496 Balzers (Liechtenstein); PLANSEE Composite Materials GmbH, Siebenbuergerstrasse 23, D-86983 Lechbruck am See (Germany)

    2012-11-15

    The impact of Al and Si on the oxidation behavior of Al-Cr-(Si)-N thin films synthesized by arc evaporation of powder metallurgically prepared Al{sub x}Cr{sub 1-x} targets with x = Al/(Al + Cr) of 0.5, 0.6, and 0.7 and (Al{sub 0.5}Cr{sub 0.5}){sub 1-z}Si{sub z} targets with Si contents of z = 0.05, 0.1, and 0.2 in N{sub 2} atmosphere was studied in detail by means of differential scanning calorimetry, thermogravimetric analysis (TGA), x-ray diffraction, and Raman spectroscopy. Dynamical measurements in synthetic air (up to 1440 Degree-Sign C) revealed the highest onset temperature of pronounced oxidation for nitride coatings prepared from the Al{sub 0.4}Cr{sub 0.4}Si{sub 0.2} target. Isothermal TGA at 1100, 1200, 1250, and 1300 Degree-Sign C highlight the pronounced improvement of the oxidation resistance of Al{sub x}Cr{sub 1-x}N coatings by the addition of Si. The results show that Si promotes the formation of a dense coating morphology as well as a dense oxide scale when exposed to air.

  16. Aeromicrobiology/air quality

    Science.gov (United States)

    Andersen, Gary L.; Frisch, A.S.; Kellogg, Christina A.; Levetin, E.; Lighthart, Bruce; Paterno, D.

    2009-01-01

    The most prevalent microorganisms, viruses, bacteria, and fungi, are introduced into the atmosphere from many anthropogenic sources such as agricultural, industrial and urban activities, termed microbial air pollution (MAP), and natural sources. These include soil, vegetation, and ocean surfaces that have been disturbed by atmospheric turbulence. The airborne concentrations range from nil to great numbers and change as functions of time of day, season, location, and upwind sources. While airborne, they may settle out immediately or be transported great distances. Further, most viable airborne cells can be rendered nonviable due to temperature effects, dehydration or rehydration, UV radiation, and/or air pollution effects. Mathematical microbial survival models that simulate these effects have been developed.

  17. Air transport system

    CERN Document Server

    Schmitt, Dieter

    2016-01-01

    The book addresses all major aspects to be considered for the design and operation of aircrafts within the entire transportation chain. It provides the basic information about the legal environment, which defines the basic requirements for aircraft design and aircraft operation. The interactions between  airport, air traffic management and the airlines are described. The market forecast methods and the aircraft development process are explained to understand the very complex and risky business of an aircraft manufacturer. The principles of flight physics as basis for aircraft design are presented and linked to the operational and legal aspects of air transport including all environmental impacts. The book is written for graduate students as well as for engineers and experts, who are working in aerospace industry, at airports or in the domain of transport and logistics.

  18. Hot Air Engines

    Directory of Open Access Journals (Sweden)

    P. Stouffs

    2011-01-01

    Full Text Available Invented in 1816, the hot-air engines have known significant commercial success in the nineteenth century, before falling into disuse. Nowadays they enjoy a renewed interest for some specific applications. The "hot-air engines" family is made up of two groups: Stirling engines and Ericsson engines. The operating principle of Stirling and Ericsson engines, their troubled history, their advantages and their niche applications are briefly presented, especially in the field of micro-combined heat and power, solar energy conversion and biomass energy conversion. The design of an open cycle Ericsson engine for solar application is proposed. A first prototype of the hot part of the engine has been built and tested. Experimental results are presented.

  19. Air Compliance Complaint Database (ACCD)

    Data.gov (United States)

    U.S. Environmental Protection Agency — THIS DATA ASSET NO LONGER ACTIVE: This is metadata documentation for the Region 7 Air Compliance Complaint Database (ACCD) which logs all air pollution complaints...

  20. Ozone - Current Air Quality Index

    Science.gov (United States)

    ... more announcements Air Quality Basics Air Quality Index | Ozone | Particle Pollution | Smoke from fires | What You Can ... Partners Kids Movies NAQ Conferences NOAA Older Adults Ozone Particle Pollution (PM2.5, PM10) Publications Publicaciones (En ...

  1. Air Markets Program Data (AMPD)

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Air Markets Program Data tool allows users to search EPA data to answer scientific, general, policy, and regulatory questions about industry emissions. Air...

  2. Air Facility System (AFS) Widget

    Data.gov (United States)

    U.S. Environmental Protection Agency — The Air Facility System (AFS) widget allows users to enter a specific location and retrieve facilities in the area of interest for stationary sources of air...

  3. State of the Air 2015

    Science.gov (United States)

    ... Banners Social Media What's the State of Your Air ? Home > 2015 > States States State List FAQ Understanding ... Environment: Act Locally What You Can Do Healthy Air News Facebook Twitter Google Plus Instagram © American Lung ...

  4. Clearing the Air

    Institute of Scientific and Technical Information of China (English)

    YIN PUMIN

    2011-01-01

    On November 8,seven Beijing residents,including a representative from a local environmental organization,were invited by the Beijing Municipal Environmental Protection Bureau (BMEPB)to visit its air-quality monitoring center,The visit was the first of a regular program of visits that will take 40 visitors to the center every Tuesday in hopes of giving them a betttr understanding of how airquality data are collected and analyzed.

  5. Urban air quality

    Science.gov (United States)

    Fenger, Jes

    Since 1950 the world population has more than doubled, and the global number of cars has increased by a factor of 10. In the same period the fraction of people living in urban areas has increased by a factor of 4. In year 2000 this will amount to nearly half of the world population. About 20 urban regions will each have populations above 10 million people. Seen over longer periods, pollution in major cities tends to increase during the built up phase, they pass through a maximum and are then again reduced, as abatement strategies are developed. In the industrialised western world urban air pollution is in some respects in the last stage with effectively reduced levels of sulphur dioxide and soot. In recent decades however, the increasing traffic has switched the attention to nitrogen oxides, organic compounds and small particles. In some cities photochemical air pollution is an important urban problem, but in the northern part of Europe it is a large-scale phenomenon, with ozone levels in urban streets being normally lower than in rural areas. Cities in Eastern Europe have been (and in many cases still are) heavily polluted. After the recent political upheaval, followed by a temporary recession and a subsequent introduction of new technologies, the situation appears to improve. However, the rising number of private cars is an emerging problem. In most developing countries the rapid urbanisation has so far resulted in uncontrolled growth and deteriorating environment. Air pollution levels are here still rising on many fronts. Apart from being sources of local air pollution, urban activities are significant contributors to transboundary pollution and to the rising global concentrations of greenhouse gasses. Attempts to solve urban problems by introducing cleaner, more energy-efficient technologies will generally have a beneficial impact on these large-scale problems. Attempts based on city planning with a spreading of the activities, on the other hand, may generate

  6. Air transparent soundproof window

    Directory of Open Access Journals (Sweden)

    Sang-Hoon Kim

    2014-11-01

    Full Text Available A soundproof window or wall which is transparent to airflow is presented. The design is based on two wave theories: the theory of diffraction and the theory of acoustic metamaterials. It consists of a three-dimensional array of strong diffraction-type resonators with many holes centered on each individual resonator. The negative effective bulk modulus of the resonators produces evanescent wave, and at the same time the air holes with subwavelength diameter existed on the surfaces of the window for macroscopic air ventilation. The acoustic performance levels of two soundproof windows with air holes of 20mm and 50mm diameters were measured. The sound level was reduced by about 30 - 35dB in the frequency range of 400 - 5,000Hz with the 20mm window, and by about 20 - 35dB in the frequency range of 700 - 2,200Hz with the 50mm window. Multi stop-band was created by the multi-layers of the window. The attenuation length or the thickness of the window was limited by background noise. The effectiveness of the soundproof window with airflow was demonstrated by a real installation.

  7. Air System Information Management

    Science.gov (United States)

    Filman, Robert E.

    2004-01-01

    I flew to Washington last week, a trip rich in distributed information management. Buying tickets, at the gate, in flight, landing and at the baggage claim, myriad messages about my reservation, the weather, our flight plans, gates, bags and so forth flew among a variety of travel agency, airline and Federal Aviation Administration (FAA) computers and personnel. By and large, each kind of information ran on a particular application, often specialized to own data formats and communications network. I went to Washington to attend an FAA meeting on System-Wide Information Management (SWIM) for the National Airspace System (NAS) (http://www.nasarchitecture.faa.gov/Tutorials/NAS101.cfm). NAS (and its information infrastructure, SWIM) is an attempt to bring greater regularity, efficiency and uniformity to the collection of stovepipe applications now used to manage air traffic. Current systems hold information about flight plans, flight trajectories, weather, air turbulence, current and forecast weather, radar summaries, hazardous condition warnings, airport and airspace capacity constraints, temporary flight restrictions, and so forth. Information moving among these stovepipe systems is usually mediated by people (for example, air traffic controllers) or single-purpose applications. People, whose intelligence is critical for difficult tasks and unusual circumstances, are not as efficient as computers for tasks that can be automated. Better information sharing can lead to higher system capacity, more efficient utilization and safer operations. Better information sharing through greater automation is possible though not necessarily easy.

  8. Oxytocin, trust and corruption: a systemic theory of the road to authoritarism Oxitocina, confianza y corrupción: una teoría sistémica del camino al autoritarismo

    Directory of Open Access Journals (Sweden)

    Esteban Laso

    2012-07-01

    Full Text Available In this text I propose a systemic theory about the process through which societies become authoritarian. I postulate, at the micro or individual level, a triadic structure of tendencies towards others (trust, suspicion and hostility; and I link it, at the macro or social level, to a group of structural factors (inequity and distrust, triggers (social, economical or political crisis and catalysts (presence of a caudillo with a populist discourse and authoritarian leaning.  Finally, I present some guidelines for the empirical testing of this theory.

    En este texto propongo una teoría sistémica del proceso por el que las sociedades llegan al autoritarismo populista. Postulo, en el nivel individual o micro, una estructura triádica de disposiciones hacia el otro (confianza, suspicacia y hostilidad; y la vinculo, en el nivel social o macro, con un conjunto de factores estructurales (inequidad y desconfianza, sucesos precipitantes (crisis social, económica o política y catalizadores (presencia de un líder caudillista de discurso populista e inclinación autoritaria. Finalmente, expongo algunos lineamientos para la puesta a prueba empírica de esta teoría.

  9. Iron-Air Rechargeable Battery

    Science.gov (United States)

    Narayan, Sri R. (Inventor); Prakash, G.K. Surya (Inventor); Kindler, Andrew (Inventor)

    2014-01-01

    Embodiments include an iron-air rechargeable battery having a composite electrode including an iron electrode and a hydrogen electrode integrated therewith. An air electrode is spaced from the iron electrode and an electrolyte is provided in contact with the air electrode and the iron electrodes. Various additives and catalysts are disclosed with respect to the iron electrode, air electrode, and electrolyte for increasing battery efficiency and cycle life.

  10. Human preference for air movement

    DEFF Research Database (Denmark)

    Toftum, Jørn; Melikov, Arsen Krikor; Tynel, A.;

    2002-01-01

    Human preference for air movement was studied at slightly cool, neutral, and slightly warm overall thermal sensations and at temperatures ranging from 18 deg.C to 28 deg.C. Air movement preference depended on both thermal sensation and temperature, but large inter-individual differences existed...... between subjects. Preference for less air movement was linearly correlated with draught discomfort, but the percentage of subjects who felt draught was lower than the percentage who preferred less air movement....

  11. Project of energy saving in compressed air; Proyecto de ahorro de energia en aire comprimido

    Energy Technology Data Exchange (ETDEWEB)

    Automatizacion, Productividad y Calidad S.A. de C.V. Puebla, (Mexico)

    2005-07-01

    The objective of this project is to reduce the operation costs by means of the energy saving through the use of the compressed air system. For this purpose the solenoid valves controlled per time and the manually acted valves of sphere must be replaced by pneumatic purges that remove from the system the condensed humidity without discharging air and which act automatically when the water reaches the level of unloading in its deposit. The pressure level is the reduction of the operation rank of pressure in the compressors, satisfying the operation requirements of the process equipment. [Spanish] El objetivo de este proyecto es reducir el costo de operacion mediante el ahorro de energia en la utilizacion del sistema de aire comprimido. Para ello se tienen que remplazar las valvulas solenoides controladas por tiempo y valvulas de esfera actuadas manualmente por purgas neumaticas que remueven del sistema la humedad condensada sin descargar aire y que actuan en forma automatica al alcanzar el agua el nivel de descarga en su deposito. El nivel de presion es la reduccion del rango de operacion de presion de los compresores, satisfaciendo los requerimientos de operacion de los equipos de proceso.

  12. Pretreatment of apramycin wastewater by catalytic wet air oxidation

    Institute of Scientific and Technical Information of China (English)

    YANG Shao-xia; FENG Yu-jie; WAN Jia-feng; LIN Qing-ying; ZHU Wan-peng; JIANG Zhan-peng

    2005-01-01

    The pretreatment technology of wet air oxidation(WAO) and coagulation and acidic hydrolysis for apramycin wastewater was investigated in this paper. The COD, apramycin, NH4+ concentration, and the ratio of BOD5/COD were analyzed, and the color and odor of the effluent were observed. WAO of apramycin wastewater, without catalyst and with RuO2/Al2 O3 and RuO2-CeO2/Al2 O3 catalysts, was carried out at degradation temperature of 200℃ and the total pressure of 4 MPa in a 1 L batch reactor. The result showed that the apramycin removals were respectively 50.2% and 55.0%, COD removals were 40.0% and 46.0%, and the ratio of BOD5/COD was increased to 0.49 and 0.54 with RuO2/Al2 O3 and RuO2-CeO2/Al2 O3 catalysts in catylytic wet air oxidation(CWAO) after the reaction of 150 min. With the pretreatment of coagulation and acidic hydrolysis, COD and apramycin removals were slight decreased, and the ratio of BOD5/COD was increased to 0.45, and the effluents was not suitable to biological treatment. The color and odor of the wastewater were the apramycin wastewater. The addition of CeO2 could promote the activity and stability of RuO2/Al2 O3 in WAO of apramycin wastewater.

  13. Overview of Emerging Air Sensors

    Science.gov (United States)

    These slides will be presented at the 2014 National Ambient Air Monitoring Conference in Atlanta, GA during August 11-15, 2014. The goal is to provide an overview of air sensor technology and the audience will be primarily state air monitoring agencies and EPA Regions.

  14. Pupils' Understanding of Air Pollution

    Science.gov (United States)

    Dimitriou, Anastasia; Christidou, Vasilia

    2007-01-01

    This paper reports on a study of pupils' knowledge and understanding of atmospheric pollution. Specifically, the study is aimed at identifying: 1) the extent to which pupils conceptualise the term "air pollution" in a scientifically appropriate way; 2) pupils' knowledge of air pollution sources and air pollutants; and 3) pupils' knowledge of air…

  15. Shock-swallowing air sensor

    Science.gov (United States)

    Nugent, J.; Sakamoto, G. M.; Webb, L. D.; Couch, L. M.

    1979-01-01

    An air-data probe allows air to flow through it so that supersonic and hypersonic shock waves form behind pressure measuring orifices and tube instead of directly on them. Measured pressures are close to those in free-flowing air and are used to determine mach numbers of flying aircraft.

  16. Strain sensing with sub-micron sized Al-AlOx-Al tunnel junctions

    OpenAIRE

    Koppinen, P. J.; Lievonen, J. T.; Ahlskog, M.; Maasilta, I. J.

    2009-01-01

    We demonstrate a local strain sensing method for nanostructures based on metallic Al tunnel junctions with AlOx barriers. The junctions were fabricated on top of a thin silicon nitride membrane, which was actuated with an AFM tip attached to a stiff cantilever. A large relative change in the tunneling resistance in response to the applied strain (gauge factor) was observed, up to a value 37. This facilitates local static strain variation measurements down to ~10^{-7}.

  17. Air Consumption Analysis of Air-Jet Weaving

    Directory of Open Access Journals (Sweden)

    RAJ KUMAR KHIANI

    2016-07-01

    Full Text Available In Textile industry, production is mostly key concern for Industry owner. This always has attracted researchers and machines manufacturers to make new developments in process and machines. Air-jet is one of the leading and successful highest productive weaving machines. However, it is now well established that due to add of charges of compressed air, manufacturing cost of air-jet weaving machine is higher as compared with rapier and projectile weaving machines. This is why countries having energy issues do not prefer air-jet weaving machines comparing projectile weaving machines. In this regard, several researchers and machine manufacturers have continuously been working to improve the efficiency of air-jet weft insertion. However, industry practice is as important as design made by researchers. The aim of this research is to investigate the air consumption of air-jet weaving on industrial scale practice. In this study, five weaving machine of same manufacturer and model were selected. It was observed that despite of manufacturing same quality of fabric, air consumption was varying almost in all weaving machines. Conventionally, mill workers adopt hit and trial practice in weaving industry including airpressure setting which leads to variation of nozzle pressure. Main reason of disparity of air consumption in air-jet weaving machines may be variation of distance from compressor to weaving machines, number of joints, un-necessary valve opening and pipes leakages cause an increase of compressed air consumption.

  18. En la infancia los diagnósticos se escriben con lápiz. La patologización de las diferencias en la clínica y la educación. Untoiglich, Gisela, et al. /266 p. Buenos Aires: Noveduc. 2013.

    Directory of Open Access Journals (Sweden)

    Adriana Cristóforo

    2013-11-01

    Full Text Available El libro está organizado en cuatro partes, en función del eje temático que tienen los trabajos que integra cada una de ellas: Procesos de Patologización; Procesos diagnósticos en la infancia; Patologías psíquicas graves en la primera infancia; y Acerca de inclusiones y exclusiones. Sin embargo más allá de esta organización, el libro tiene una armonía que, a través de la diversidad, otorga coherencia al abordaje de un problema complejo como lo es el de los diagnósticos en la infancia. Precisamente es esa manera compleja de abordar el problema la que aporta uno de los valores del texto: las múltiples miradas, significaciones y expresiones que surgen del entrecruzamiento entre las distintas profesiones de los autores y las diversas inscripciones geográficas (Argentina, Brasil, Portugal. Asimismo tal diversidad geográfica muestra lo extendido del fenómeno de la patologización de la infancia y de los recursos que el mismo aplicapara perpetuarse, por ejemplo, las regulaciones de distinto estatuto legal que los Estados van estableciendo en relación a las instituciones de salud y educación.

  19. Accuracy of Prediction Equations to Assess Percentage of Body Fat in Children and Adolescents with Down Syndrome Compared to Air Displacement Plethysmography

    Science.gov (United States)

    Gonzalez-Aguero, A.; Vicente-Rodriguez, G.; Ara, I.; Moreno, L. A.; Casajus, J. A.

    2011-01-01

    To determine the accuracy of the published percentage body fat (%BF) prediction equations (Durnin et al., Johnston et al., Brook and Slaughter et al.) from skinfold thickness compared to air displacement plethysmography (ADP) in children and adolescents with Down syndrome (DS). Twenty-eight children and adolescents with DS (10-20 years old; 12…

  20. Al clamor de les vuvuzeles

    Directory of Open Access Journals (Sweden)

    Javier Olivera Betrán

    2010-09-01

    Full Text Available El Mundial de Futbol de Sud-àfrica ha situat l’Àfrica al mapa mundial i ha mostrat al món el triomf de l’estil de futbol d’Espanya basat en la col·lectivitat, l’esperit d’equip, la humilitat, la cohesió interna i el joc bonic. L’organització africana, seriosa i eficaç, ha sabut mobilitzar i il·lusionar la població del país que ha participat en el mundial des de l’orgull de ser africà, amb l’esperit alegre, festiu i també reivindicatiu de la gent de l’Àfrica. Aquest esdeveniment suposa el llançament de la marca “Sud-àfrica” al món amb un avís clar d’optar a l’organització d’uns primers Jocs Olímpics a Àfrica (potser els de 2020. S’obre una finestra d’esperança al segle xxi per al continent perdut de la mà de l’esport espectacle tan universal, massiu, emocional i mercantil que també es juga a la canxa de la política i de l’economia.

  1. Air Risk Information Support Center

    Energy Technology Data Exchange (ETDEWEB)

    Shoaf, C.R.; Guth, D.J. [Environmental Protection Agency, Washington, DC (United States)

    1990-12-31

    The Air Risk Information Support Center (Air RISC) was initiated in early 1988 by the US Environmental Protection Agency`s (EPA) Office of Health and Environmental Assessment (OHEA) and the Office of Air Quality Planning and Standards (OAQPS) as a technology transfer effort that would focus on providing information to state and local environmental agencies and to EPA Regional Offices in the areas of health, risk, and exposure assessment for toxic air pollutants. Technical information is fostered and disseminated by Air RISCs three primary activities: (1) a {open_quotes}hotline{close_quotes}, (2) quick turn-around technical assistance projects, and (3) general technical guidance projects. 1 ref., 2 figs.

  2. Adobe AIR for Android -sovelluskehitys

    OpenAIRE

    Palovuori, Jani

    2011-01-01

    Tässä opinnäytetyössä käsitellään sovelluskehitystä Android-laitteille Adoben AIR for Android -tekniikkaa hyväksi käyttäen. Tavoitteena on esitellä sovelluskehityksen periaatteita Adoben Flash-tekniikkaan pohjautuvan AIR for Android -teknologian kannalta. Työ on tehty Yleisradio Oy:n toimeksiantona ja toimii johdatuksena AIR-sovelluksen kehittämiseen AIR for Android -teknologialla. Työssä esitellään yleisesti rikkaat internet-sovellukset ja käydään tarkemmin läpi Adoben AIR-teknologia sek...

  3. Positive effect of hydrogen-induced vacancies on mechanical alloying of Fe and Al

    Energy Technology Data Exchange (ETDEWEB)

    Čížek, J., E-mail: jakub.cizek@mff.cuni.cz [Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Prague 8 CZ-18000 (Czech Republic); Lukáč, F.; Procházka, I.; Vlček, M. [Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Prague 8 CZ-18000 (Czech Republic); Jirásková, Y. [Institute of Physics of Materials, AS CR, Žižkova 22, CZ-616 62 Brno (Czech Republic); Švec, P.; Janičkovič, D. [Institute of Physics, Slovak Academy of Science, Dúbravská cesta 9, 84511 Bratislava (Slovakia)

    2015-04-25

    Highlights: • Fe{sub 82}Al{sub 18} nano-powders were prepared by ball milling and mechanical alloying. • Full mechanical alloying of Fe–Al was achieved using hydrogen atmosphere. • Hydrogen segregating at vacancies enhances vacancy concentration in Fe–Al. • Hydrogen-induced vacancies facilitate diffusion of Al atoms into Fe grains. • Nitrogen inhibits Fe–Al alloying by formation of a nitride layer on Fe grains. - Abstract: Nanocrystalline Fe{sub 82}Al{sub 18} powders were prepared by high energy ball milling in various atmospheres. Two preparation techniques were compared: (i) mechanical milling of pre-alloyed Fe{sub 82}Al{sub 18} pieces and (ii) mechanical alloying of pure Fe and Al powders. Single phase Fe{sub 82}Al{sub 18} nano-powder was formed by mechanical alloying in H{sub 2} atmosphere while milling in N{sub 2} or air environment suppressed mechanical alloying due to passivation of Fe surfaces. Positron annihilation spectroscopy revealed that mechanical alloying of Fe and Al in H{sub 2} atmosphere is mediated by hydrogen-induced vacancies.

  4. A united refinement technology for commercial pure Al by Al-10Ti and Al-Ti-C master alloys

    International Nuclear Information System (INIS)

    Because flake-like TiAl3 particles in Al-Ti-C master alloys prepared in a melt reaction method dissolve slowly when they are added into Al melt at 720 deg. C, Ti atoms cannot be released rapidly to play the assistant role of grain refinement, leading to a poor refinement efficiency of Al-Ti-C master alloys. A united refinement technology by Al-10Ti and Al-Ti-C master alloys was put forward in this paper. The rational combination of fine blocky TiAl3 particles in Al-10Ti and TiC particles in Al-Ti-C can improve the nucleation rate of α-Al. It not only improves the grain refinement efficiency of Al-Ti-C master alloys, but also reduces the consumption

  5. Conjuntivitis alérgica

    Directory of Open Access Journals (Sweden)

    Alejandro Tello Hernández

    2008-07-01

    Full Text Available La conjuntivitis alérgica es una de las causas más comunesde consulta externa en oftalmología y tiene una muy altarelación con las reacciones alérgicas sistémicas. Lafisiopatología de las reacciones de hipersensibilidad noshace entender los cuadros clínicos característicos de estapatología y sus diferentes grados de severidad. Eldiagnostico diferencial es amplio, sin embargo hay clavesdiagnosticas que nos orientan rápidamente al diagnosticocorrecto. El tratamiento se enfoca en las medidasfarmacológicas y no farmacológicas, utilizándolas enconjunto para disminuir la recurrencia del cuadro y prevenirsecuelas visuales.

  6. Electrowinning Al from Al2S3 in Molten Salt

    NARCIS (Netherlands)

    Xiao, Y.; Van der Plas, D.W.; Bohte, J.; Lans, S.C.; Van Sandwijk, A.; Reuter, M.A.

    2007-01-01

    In order to investigate an alternative process for the production of primary aluminum via a sulfide intermediate, the electrochemical behavior of Al2S3 in molten salt has been studied on a laboratory scale. The effects of electrolyte composition, temperature, and cell design on the cell performance

  7. Oxidation of O'-SiAlON-ZrO2 Composite Ceramics

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The oxidation kinetics of O'-SiAlON-ZrO2 composite ceramics in the temperature range of 1373-1773K has been studied. The oxidation experiments with powder and plates of O'-SiAlON-ZrO2 composite ceramics in air have been carried out. The overall activation energy of oxidation reaction is 263.69 kJ / mol. The products and structures of O'-SiAlON-ZrO2 oxidation layer have been analysed by XRD (X-ray diffraction), SEM (scanning electron microscope) and AFM (atomic force microscope).

  8. Influence of the microstructure of plasma deposited MCrAlY coatings on their tribological behaviour

    Energy Technology Data Exchange (ETDEWEB)

    Li, S.; Langlade, C.; Fayeulle, S.; Treheux, D. [Ecole Centrale de Lyon, Ecully (France). Lab. Ingenierie et Fonctionnalisation des Surfaces

    1998-03-01

    MCrAlY coatings (CoNiCrAlY) were thermal sprayed under various atmospheres (air, argon, vacuum) on a nickel-based superalloy (Hastelloy X). Their microstructures (porosity, presence of oxides and phase composition) and mechanical properties (hardness and Young modulus) were characterized. The friction behaviour of these coatings sliding against a low-pressure plasma sprayed NiCoCrAlYTa coating was evaluated under fretting conditions. The study focused mainly on the different degradation mechanisms that may occur. Depending on the coating microstructure, two kinds of damage were observed: particle detachment and microstructural transformation (tribologically transformed structure). Adhesion and oxidation wear were also studied. (orig.) 9 refs.

  9. A search for microwave emission from cosmic ray air showers

    Science.gov (United States)

    Williams, Christopher Lee

    At the highest energies, the sources of cosmic rays should be among the most powerful extragalactic accelerators. Large observatories have revealed a flux suppression above a few 1019 eV, similar to the expected effect of the interaction of ultrahigh energy cosmic rays (UHECR) with the cosmic microwave background. The Pierre Auger Observatory has measured the largest sample of cosmic ray induced extensive air showers (EAS) at the highest energies leading to a precise measurement of the energy spectrum, hints of spatial anisotropy, and a surprising change in the chemical composition at the highest energies. To answer the question of the origin of UHECRs a larger sample of high quality data will be required to reach a statistically significant result. One of the possible techniques suggested to achieve this much larger data sample, in a cost effective way, is ultra-wide field of view microwave telescopes which would operate in an analogous way to the already successful fluorescence detection (FD) technique. Detecting EAS in microwaves could be done with 100% duty cycle and essentially no atmospheric effects. This presents many advantages over the FD which has a 10% duty cycle and requires extensive atmospheric monitoring for calibration. We have pursued both prototype detector designs and improved laboratory measurements, the results of which are reported herein, and published in (Alvarez-Muniz et al., 2013; Alvarez-Muniz et al., 2012a; Williams et al., 2013; Alvarez-Muniz et al., 2013). The Microwave Detection of Air Showers (MIDAS) experiment is the first ultra-wide field of view imaging telescope deployed to detect isotropic microwave emission from EAS. With 61 days of livetime data operating on the University of Chicago campus we were able to set new limits on isotropic microwave emission from extensive air showers. The new limits rule out current laboratory air plasma measurements (Gorham et al., 2008) by more than five sigma. The MIDAS experiment continues to

  10. AIR VELOCITY SENSOR

    Institute of Scientific and Technical Information of China (English)

    潘本琛

    1992-01-01

    During the last twenty years there has been rapid progress in the use of automation in a wide range of industries,as well as in military, scientific application. However, the progress in the application of automatic control is often hindered by the lack of accurate, reliable measuring apparatus. An economic thermal couple air flow sensor with better linearity (accuracy is ±5% of full scale) has been successfully made at Trolex Ltd. Many other existing sensors fail in the application of industries because of non-linearity.

  11. Ag-Air Service

    Science.gov (United States)

    1981-01-01

    Econ, Inc.'s agricultural aerial application, "ag-air," involves more than 10,000 aircraft spreading insecticides, herbicides, fertilizer, seed and other materials over millions of acres of farmland. Difficult for an operator to estimate costs accurately and decide what to charge or which airplane can handle which assignment most efficiently. Computerized service was designed to improve business efficiency in choice of aircraft and determination of charge rates based on realistic operating cost data. Each subscriber fills out a detailed form which pertains to his needs and then receives a custom-tailored computer printout best suited to his particular business mix.

  12. Microbial Bioreactor Development in the ALS NSCORT

    Science.gov (United States)

    Mitchell, Cary; Whitaker, Dawn; Banks, M. Katherine; Heber, Albert J.; Turco, Ronald F.; Nies, Loring F.; Alleman, James E.; Sharvelle, Sybil E.; Li, Congna; Heller, Megan

    The NASA Specialized Center of Research and Training in Advanced Life Support (the ALS NSCORT), a partnership of Alabama A & M, Howard, and Purdue Universities, was established by NASA in 2002 to develop technologies that will reduce the Equivalent System Mass (ESM) of regenerative processes within future space life-support systems. A key focus area of NSCORT research has been the development of efficient microbial bioreactors for treatment of human, crop, and food-process wastes while enabling resource recovery. The approach emphasizes optimizing the energy-saving advantages of hydrolytic enzymes for biomass degradation, with focus on treatment of solid wastes including crop residue, paper, food, and human metabolic wastes, treatment of greywater, cabin air, off-gases from other treatment systems, and habitat condensate. This summary includes important findings from those projects, status of technology development, and recommendations for next steps. The Plant-based Anaerobic-Aerobic Bioreactor-Linked Operation (PAABLO) system was developed to reduce crop residue while generating energy and/or food. Plant residues initially were added directly to the bioreactor, and recalcitrant residue was used as a substrate for growing plants or mushrooms. Subsequently, crop residue was first pretreated with fungi to hydrolyze polymers recalcitrant to bacteria, and leachate from the fungal beds was directed to the anaerobic digester. Exoenzymes from the fungi pre-soften fibrous plant materials, improving recovery of materials that are more easily biodegraded to methane that can be used for energy reclamation. An Autothermal Thermophilic Aerobic Digestion (ATAD) system was developed for biodegradable solid wastes. Objectives were to increase water and nutrient recovery, reduce waste volume, and inactivate pathogens. Operational parameters of the reactor were optimized for degradation and resource recovery while minimizing system requirements and footprint. The start-up behavior

  13. ALS:A SAIRASTAVAN TOIMINTATERAPIA

    OpenAIRE

    Vuorinen, Johanna

    2013-01-01

    Amyotrofinen lateraali skleroosi on harvinainen, etenevä sairaus. Sairaus surkastuttaa edetessään potilaan tahdonalaisen lihaksiston. Sairauden oireet näkyvät yleensä ensin raajoissa, mutta myös nielun lihaksista alkava bulbaarinen taudinmuoto on mahdollinen. ALS voi myös aiheuttaa frontotemporaalista dementiaa. Sairaus etenee yksilöllisesti, mutta sen kesto on yleensä noin 3-5 vuotta. Keski-Suomen keskussairaalassa ALS:n sairastuneen kuntoutukseen osallistuu moniammatillinen työryhmä, j...

  14. Al-Qaeda Since 911

    OpenAIRE

    Brahimi, Alia

    2012-01-01

    Seconds after smiling at her local MP and shaking his hand, Roshonara Choudhry plunged a knife into his stomach. The attack on Stephen Timms in May 2010 was not the most high profile assault inspired by al- Qaeda, nor was it fatal. It did, however, offer a commentary on the changing nature of the terrorist threat since 9/11, al-Qaeda’s major impact on international relations as well as its major failure, and the intimate, perhaps inevitable, connection between the two.

  15. Development and Analysis of Desiccant Enhanced Evaporative Air Conditioner Prototype

    Energy Technology Data Exchange (ETDEWEB)

    Kozubal, E.; Woods, J.; Judkoff, R.

    2012-04-01

    This report documents the design of a desiccant enhanced evaporative air conditioner (DEVAP AC) prototype and the testing to prove its performance. Previous numerical modeling and building energy simulations indicate a DEVAP AC can save significant energy compared to a conventional vapor compression AC (Kozubal et al. 2011). The purposes of this research were to build DEVAP prototypes, test them to validate the numerical model, and identify potential commercialization barriers.

  16. Effect of the aggregate grading on the concrete air permeability

    Directory of Open Access Journals (Sweden)

    Argiz, C.

    2014-09-01

    Full Text Available Great durability problems are being found in concrete structures related to the penetrability of aggressive agents through the concrete (ie. chloride penetration, sulphate attack, carbonation, freezing and thawing, and so on. Air permeability coefficient is used as an effective tool to estimate the potential durability of concrete structures due to its direct relation with the microstructure and the moisture content. This paper discusses the effect of the aggregate grading and water/cement ratio on the air permeability coefficient. An aggregate grading with more sand than coarse aggregates has resulted more beneficial from the point of view of concrete air permeability. This fact can be attributed to a denser skeleton formed by the finer aggregates. With fine aggregates, the higher water/cement ratio, the lower air permeability. However, the contrary was found with coarse aggregates. Overall, a temperature increase from 20 °C to 60 °C during preconditioning led to a Dair increase of 40–80%.Se han encontrado una gran cantidad de problemas de durabilidad de estructuras de hormigón relacionados con la penetración de agentes agresivos externos (es decir, penetración de cloruros, ataque por sulfatos, carbonatación, hielo-deshielo, etc.. El coeficiente de permeabilidad al aire se utiliza como una herramienta eficaz para estimar la durabilidad potencial de las estructuras de hormigón debido a su relación directa con su microestructura y contenido de humedad. Se discute el efecto de la gradación de los áridos y relación agua/cemento en el coeficiente de permeabilidad al aire. Con áridos más finos que gruesos, el resultado es más beneficioso, lo que se atribuye a que la arena forma un esqueleto más denso. Con áridos más finos, al aumentar la relación agua/cemento, disminuye la permeabilidad al aire; pero con áridos más gruesos se ha observado lo contrario. Cuando se pre-acondiciona de 20 °C a 60 °C, se produce un aumento del Dair

  17. Microstructure and oxidation behaviour of TiAl(Nb)/Ti$_2$AlC composites fabricated by mechanical alloying and hot pressing

    Indian Academy of Sciences (India)

    HADI KARIMI; ALI GHASEMI; MORTEZA HADI

    2016-09-01

    TiAl-based intermetallic matrix composites with dispersed Ti$_2$AlC particles and different amounts of Nb were successfully synthesized by mechanical alloying and hot pressing. The phase evolution of Ti–48 at%. Al elemental powder mixture milled for different times with hexane as a process control agent was investigated. It was found that after milling for 25 h, a Ti(Al) solid solution was formed; also with increase in the milling time to 50 h, an amorphous phase was detected. Formation of a supersaturated Ti(Al) solid solution after 75 h milling was achieved by crystallization of amorphous phase. Addition of Nb to system also exhibited a supersaturated Ti(Al,Nb) solid solution after milling for 75 h, implying that the Al and Nb elements were dissolved in the Ti lattice in a nonequilibrium state. Annealing of 75 h milled powders resulted in the formation of equilibrium TiAl intermetallic with Ti$_2$AlC phases that showed the carbon that originates from hexane, participated in the reaction to form Ti$_2$AlCduring heating. Consolidation of milled powder with different amounts of Nb was performed by hot pressing at 1000$^{\\circ}$C for 1 h. Only the presence of $\\gamma$-TiAl and Ti$_2$AlC was detected and no secondary phases were observed on the base of Nb. Displacement of $\\gamma$-TiAl peaks with Nb addition implied that the Nb element was dissolved into TiAl matrix in the form of solid solution, causing the lattice tetragonality of TiAl to increase slightly. The values for density and porosity of samples indicated that condition of hot pressing process with temperature and pressure was adequate to consolidate almost fully densified samples. The isothermal oxidation test was carried out at 1000$^{\\circ}$C in air to assess the effect of Nb addition on the oxidation behaviour of TiAl/Ti$_2$AlC composites. The oxidation resistance of composites was improved with the increase in the Nb content due to the suppression of TiO$_2$ growth, the formation and stabilization

  18. Microstructure of MCMgAl12Zn1 magnesium alloy

    Directory of Open Access Journals (Sweden)

    Dobrzański L. A.

    2007-01-01

    Full Text Available In this paper is presented the structure of the cast magnesium alloys as cast state and after heat treatment cooled with different cooling rate, depending on the cooling medium (furnace, water, air. For investigations samples in shape of 250x150x25 mm plates were used. The structure have been study in the light microscope, scanning electron microscope equipped with an electron back scattering facility. The effects of the addition of Al on the microstructure were also studied. In the analysed alloys a structure of α solid solution and fragile phase β(Mg17Al12 occurred mainly on grain borders as well as eutectic and phase with Mn, Fe and Si. Investigation are carried out for the reason of chemical composition influence and precipitation processes influence to the structure and mechanical properties of the magnesium cast alloys with different chemical composition in as cast alloys and after heat treatment.

  19. Welding of Very Dissimilar Materials (Fe-Al)

    Science.gov (United States)

    Schneider, Judy; Radzilowski, Ron

    2014-10-01

    Designers of transportation vehicles (air, land, or sea) continually seek ways to reduce vehicle weight in response to increasing fuel economy mandates, mission requirements, or other competitive pressures. One way to do this is by the selection of material types and their properties based on functional and structural requirements. While these material changes can help meet performance mandates, their implementation in a production environment relies on retaining economic competitiveness. This article traces the history of the various joining processes relevant to the current challenge in joining the very dissimilar families of steel (Fe) and aluminum (Al) alloys.

  20. Baltimore Air Toxics Study (BATS)

    Energy Technology Data Exchange (ETDEWEB)

    Sullivan, D.A. [Sullivan Environmental Consulting, Inc., Alexandria, VA (United States)

    1996-12-31

    The Baltimore Air Toxics Study is one of the three urban air toxics initiatives funded by EPA to support the development of the national air toxics strategy. As part of this project, the Air Quality Integrated Management System (AIMS) is under development. AIMS is designed to bring together the key components of urban air quality management into an integrated system, including emissions assessment, air quality modeling, and air quality monitoring. Urban area source emissions are computed for a wide range of pollutants and source categories, and are joined with existing point source emissions data. Measured air quality data are used to evaluate the adequacy of the emissions data and model treatments as a function of season, meteorological parameters, and daytime/nighttime conditions. Based on tested model performance, AIMS provides the potential to improve the ability to predict air quality benefits of alternative control options for criteria and toxic air pollutants. This paper describes the methods used to develop AIMS, and provides examples from its application in the Baltimore metropolitan area. The use of AIMS in the future to enhance environmental management of major industrial facilities also will be addressed in the paper.

  1. Andalusian astronomy: al-Zij al-Muqtabis of Ibn al-Kammâd.

    Science.gov (United States)

    Chabás, J.; Goldstein, B. R.

    1994-12-01

    In the twelfth century the Arabic astronomer Ibn al-Kammâd, living in Islamic Spain, composed three sets of astronomical tables, called "zijes". The zijes were largely based on the work of predecessors, going back to Ptolemy on the one hand, and Hindu astronomers on the other. None of his zijes survived in the original Arabic, but a Latin manuscript contains a translation of an apparently complete zij, the "al-Zij al-Muqtabis". This paper examines the body of astronomical knowledge contained in this zij. Specifically, it is shown that one can gain valuable information on the solar theory of the Islamic astronomers from this translation. Furthermore, the theory of lunar and solar eclipses in the work is analyzed, and tables of mean planetary and solar motions are discussed. In addition, tables for the motion of the vernal equinox, star tables, and several topics of Islamic spherical astronomy are examined.

  2. ¿COLOMBIA DEBE APOSTARLE AL SOFTWARE LIBRE, AL DE FUENTE ABIERTA O AL PROPIETARIO?

    Directory of Open Access Journals (Sweden)

    Luis Alberto Girón Murillo

    2014-06-01

    Full Text Available Es complejo para gestores y administradores conocer las implicaciones que la adopción de modelos de desarrollo de software tendría para una región. Este artículo ofrece una evaluación de las implicaciones dinámicas que para el desarrollo de software de una región tendría el apostar de forma excluyente al software libre, al software de fuente abierta y al software propietario. Se desarrolló un modelo de simulación en Vensim de la dinámica de sistemas en donde se evaluaron 3 escenarios: uno en donde se adopta de forma excluyente el software libre, uno en donde se adopta el software propietario y uno en donde se adopta el software de fuente abierta. Se ofrecen descripciones y explicaciones de los resultados que sugieren las potencialidades de cada uno de los modelos de desarrollo evaluados.

  3. Comparison of indoor air and outdoor air contaminant concentrations

    OpenAIRE

    Pykhova, Ekaterina

    2014-01-01

    Since most people spend their time indoors, there has been increased interest in air pollution concen-trations. Number of very small liquid and solid particles suspended in the air is depending on different factors. But how should be decreased particle number? The field of this work is particulate matter concentration in the indoor and outdoor air. Measurements were carried out in number concentration. The Indoor-Outdoor correlation was de-termined in order to investigate normative parti...

  4. Effect of Cr on high temperature oxidation of TiAl

    Institute of Scientific and Technical Information of China (English)

    DONG Zi-qiang; JIANG Hui-ren; FENG Xiao-ran; WANG Zhong-lei

    2006-01-01

    The oxidation behavior of TiAl-Cr(mole fraction of Cr-0-20%) was investigated at 1 173 K in air. The microstructure and composition of the oxide scale were studied by X-ray diffractometry(XRD), scanning electron microscopy(SEM) and electro-probe micro-analyses(EPMA). The results show that with the addition of Cr content from 0 to 8%, the oxidation resistance decreases, especially at 3%, which is mainly attributed to the doping effect of Cr3+. TiAl-Cr(mole fraction of Cr-15%-20%) has good oxidation resistance, and the protective alumina layer is preferentially formed on the surface of TiAl alloy, which is due to an increase of mole ratio of Al to Ti in TiAl-Cr alloys.

  5. Development of NbTiN-Al direct antenna coupled kinetic inductance detectors

    NARCIS (Netherlands)

    Lankwarden, Y.J.Y.; Endo, A.; Baselmans, J.J.A.; Bruijn, M.P.

    2012-01-01

    We have developed a coplanar waveguide (CPW) Kinetic Inductance Detector consisting of Al and NbTiN, coupled at its shorted end to a planar antenna. To suppress the odd mode due to direct coupling to sky radiation by the KID we have also developed freestanding metal air bridges

  6. Oxidation-induced crack healing in Ti3AlC2 ceramics

    NARCIS (Netherlands)

    Song, G.M.; Pei, Y.T.; Sloof, W.G.; Li, S.B.; Hosson, J.Th.M. De; Zwaag, S. van der

    2008-01-01

    Crack healing of Ti3AlC2 was investigated by oxidizing a partially pre-cracked sample. A crack near a notch was introduced into the sample by tensile deformation. After oxidation at 1100 degrees C in air for 2 h, the crack was completely healed, with oxidation products consisting primarily of alpha-

  7. Dynamic Modeling of ALS Systems

    Science.gov (United States)

    Jones, Harry

    2002-01-01

    The purpose of dynamic modeling and simulation of Advanced Life Support (ALS) systems is to help design them. Static steady state systems analysis provides basic information and is necessary to guide dynamic modeling, but static analysis is not sufficient to design and compare systems. ALS systems must respond to external input variations and internal off-nominal behavior. Buffer sizing, resupply scheduling, failure response, and control system design are aspects of dynamic system design. We develop two dynamic mass flow models and use them in simulations to evaluate systems issues, optimize designs, and make system design trades. One model is of nitrogen leakage in the space station, the other is of a waste processor failure in a regenerative life support system. Most systems analyses are concerned with optimizing the cost/benefit of a system at its nominal steady-state operating point. ALS analysis must go beyond the static steady state to include dynamic system design. All life support systems exhibit behavior that varies over time. ALS systems must respond to equipment operating cycles, repair schedules, and occasional off-nominal behavior or malfunctions. Biological components, such as bioreactors, composters, and food plant growth chambers, usually have operating cycles or other complex time behavior. Buffer sizes, material stocks, and resupply rates determine dynamic system behavior and directly affect system mass and cost. Dynamic simulation is needed to avoid the extremes of costly over-design of buffers and material reserves or system failure due to insufficient buffers and lack of stored material.

  8. Un controesempio al Modus Ponens

    Directory of Open Access Journals (Sweden)

    Vann McGee

    2011-11-01

    Full Text Available La traduzione dell’articolo è stata resa possibile grazie al consenso dell’autore e del Journal of Philosophy. Riferimenti originali: Vann McGee (1985: “A Counterexample to Modus Ponens”, Journal of Philosophy, Vol. 82, No. 9 (Sep. 1985, pp. 462-47. [N.d.T.

  9. Thermal Gradient Behavior of TBCs Subjected to a Laser Gradient Test Rig: Simulating an Air-to-Air Combat Flight

    Science.gov (United States)

    Lima, Rogerio S.; Marple, Basil R.; Marcoux, P.

    2016-01-01

    A computer-controlled laser test rig (using a CO2 laser) offers an interesting alternative to traditional flame-based thermal gradient rigs in evaluating thermal barrier coatings (TBCs). The temperature gradient between the top and back surfaces of a TBC system can be controlled based on the laser power and a forced air back-face cooling system, enabling the temperature history of complete aircraft missions to be simulated. An air plasma spray-deposited TBC was tested and, based on experimental data available in the literature, the temperature gradients across the TBC system (ZrO2-Y2O3 YSZ top coat/CoNiCrAlY bond coat/Inconel 625 substrate) and their respective frequencies during air-to-air combat missions of fighter jets were replicated. The missions included (i) idle/taxi on the runway, (ii) take-off and climbing, (iii) cruise trajectory to rendezvous zone, (iv) air-to-air combat maneuvering, (v) cruise trajectory back to runway, and (vi) idle/taxi after landing. The results show that the TBC thermal gradient experimental data in turbine engines can be replicated in the laser gradient rig, leading to an important tool to better engineer TBCs.

  10. AIR SEPARATION BY PRESSURE SWING ADSORPTION USING SUPERIOR ADSORBENTS

    Energy Technology Data Exchange (ETDEWEB)

    Ralph T. Yang

    2001-08-31

    Li-X zeolite (Si/Al = 1.0) is currently the best sorbent for use in the separation of air by adsorption processes. In particular, pressure swing adsorption (PSA) using zeolite sorbents is being increasingly used for air separation. Silver is also known to strongly affect the adsorptive properties of zeolites; and it is known that thermal vacuum dehydration of silver zeolites leads to the formation of silver clusters within the zeolite. In this work we have synthesized type X zeolites containing Ag and also varying mixtures of Li and Ag. In this project, we developed the Ag-containing zeolite as the best sorbent for air separation. We have also studied Co-ligand compounds as oxygen-selective sorbents. Syntheses, structural characterization and adsorption properties have been performed on all sorbents. The results are described in detail in 5 chapters.

  11. Industrial concessions, fires and air pollution in Equatorial Asia

    Science.gov (United States)

    Spracklen, D. V.; Reddington, C. L.; Gaveau, D. L. A.

    2015-09-01

    Forest and peatland fires in Indonesia emit large quantities of smoke leading to poor air quality across Equatorial Asia. Marlier et al (2015 Environ. Res. Lett. 10 085005) explore the contribution of fires occurring on oil palm, timber (wood pulp and paper) and natural forest logging concessions to smoke emissions and exposure of human populations to the resulting air pollution. They find that one third of the population exposure to smoke across Equatorial Asia is caused by fires in oil palm and timber concessions in Sumatra and Kalimantan. Logging concessions have substantially lower fire emissions, and contribute less to air quality degradation. This represents a compelling justification to prevent reclassification of logging concessions into oil palm or timber concessions after logging. This can be achieved by including logged forests in the Indonesian moratorium on new plantations in forested areas.

  12. Derecho humano al agua y al saneamiento: derechos estrechamente vinculados al derecho a la vida

    OpenAIRE

    Fernández Aller, Maria Celia; Luis Romero, Elena de; Guzmán Acha, Cristina

    2013-01-01

    Los derechos humanos al agua y al saneamiento están íntimamente relacionados con otros derechos esenciales para la vida, como la alimentación o la salud. Su reconocimiento como derechos humanos en 2010 marca un hito importante en el respeto, protección y realización de estos derechos, que se encuentran seriamente vulnerados para una mayoría de población más vulnerable y empobrecida, sobre todo en el ámbito rural. Mucho camino queda aún para conseguir no sólo la disponibilidad de agua y saneam...

  13. First principles calculation of ac conductance for Al-BDT-Al and Al-Cn-Al systems

    Directory of Open Access Journals (Sweden)

    Jia-Ning Zhuang

    2011-12-01

    Full Text Available We perform first-principles calculation to investigate the dynamic conductance of atomic wires of the benzenedithiol (BDT as well as carbon chains with different length in contact with two Al(100 electrodes (Al-Cn-Al. Our calculation is based on the combination of the non-equilibrium Green's function and the density functional theory. For ac conductance, there are two theories that ensures the current conservation: (1. the global formula which is a phenomenological theory that partitions the total displacement current into each leads so that the current is conserved.(2. the local formula which is a microscopic theory that includes Coulomb interaction explicitly so that the current is conserved automatically. In this work, we use the local formula to calculate the dynamic conductance, especially the emittance. We give a detailed comparison and analysis for the results obtained from two theories. Our numerical results show that the global formula overestimates the emittance by two orders of magnitude. We also obtain an inequality showing that the emittance from global formula is greater than that from local formula for real atomic structures. For Al-Cn-Al structures, the oscillatory behavior as the number of carbon chain N varies from even to odd remains unchanged when local formula is used. However, the prediction of local formula gives rise to opposite response when N is odd (inductive-like as compared with that of global formula. Therefore, one should use the local formula for an accurate description of ac transport in nanoscale structures. In addition, the ‘size effect’ of the ac emittance is analyzed and can be understood by the kinetic inductance. Since numerical calculation using the global formula can be performed in orbital space while the local formula can only be used in real space, our numerical results indicate that the calculation using the local formula is extremely computational demanding.

  14. Personalidad y tolerancia al dolor

    Directory of Open Access Journals (Sweden)

    JESÚS M.ª CARRILLO

    2005-01-01

    Full Text Available Se examina la relación de algunas variables de personalidad -EPQ-A (Eysenck y Eysenck, 1975, NEO-PI (McCrae y Costa, 1988 y STA -personalidad esquizotípica- y STB -personalidad límite-, de Claridge y Broks (1984, con la tolerancia al dolor experimental inducido mediante agua fría (cold pressor test, según el procedimiento de Staats, Heckmat y Staats (1998 en una muestra filtrada mediante un cuestionario sobre dolor crónico, dolores de cabeza, de espalda, artritis, síndrome de Raynaud, y personas bajo medicación. La tolerancia al dolor experimental se evaluó mediante el Umbral del dolor (tiempo en segundos desde la introducción de la mano en el agua hasta el primer informe de dolor, Mantenimiento del dolor (duración en segundos de la inmersión de la mano desde la aparición del umbral hasta su retirada y Tolerancia al dolor (duración total en segundos de la inmersión de la mano desde su introducción hasta su retirada. Un análisis correlacional, factorial y de regresión por pasos mostraron un efecto cruzado entre medidas de ansiedad (tolerancia negativa al dolor y psicoticismo, siendo psicoticismo junto con control emocional predictores de tolerancia positiva al dolor. En cuanto a psicoticismo, parece que son sus elementos de naturaleza paranoide y de "dureza" los que afectan a una percepción atenuada del dolor.

  15. Del genio al ángel caído: Ecos de Hölderlin en la poesía de Leopoldo María Panero

    Directory of Open Access Journals (Sweden)

    Ruano, Joaquín

    2015-12-01

    Full Text Available The works of Spanish poet Leopoldo María Panero (Madrid, 1948 are a part of the current of Modernity that questions the hegemonic —literary and moral— discourse of its time by reflecting on the meaning of Evil in this discourse. One of the key references in this questioning are the works of German Romantic Friedrich Hölderlin, from which Panero recovers the notion of a lost Golden Age, as well as an inevitably head toward failure quest of the Absolute. But, beyond intertextual references, Hölderin becomes a recurrent topic in Panero’s poetry, as an alter ego of the poet wasted away with madness.La obra del autor español Leopoldo María Panero (Madrid, 1948 se inserta en una de las vertientes de la modernidad que pone en cuestión el discurso hegemónico —literario y moral— de su tiempo reflexionando sobre el significado del mal en dicho discurso. Una de las referencias clave en esa puesta en cuestión paneriana es la obra del romántico alemán Friedrich Hölderlin, de la cual Panero recuperará la noción de una Edad de Oro perdida, así como una búsqueda del absoluto abocada irremediablemente al fracaso. Pero, más allá de las referencias intertextuales, Hölderlin se convertirá en una figura recurrente en la poesía de Panero, como alter ego del poeta consumido por la locura.

  16. Influence of heat treatment on microstructure of slurry aluminide coatings type TiAlSi obtained on TiAlCrNb alloy

    Directory of Open Access Journals (Sweden)

    G. Moskal

    2009-04-01

    Full Text Available Purpose: Influence of heat treatment on microstructural changes in slurry TiAlSi coating deposited with 12.5% Si concentration on Ti48Al2Cr2Nb intermetallic alloy and investigation of the influence of Si addition on the structure of obtained coatings is a purpose of this paper.Design/methodology/approach: The research allowed identifying microstructural changes that took place during annealing at 950°C of the TiAlSi coating for 2 to 10h exposure in air. A scope of the research encompassed a microstructural analysis with the use of macro and micro investigation - LM, SEM microscopy, XRD phase analysis and EDS analysis.Findings: The investigation has shown that the thickness of the TiAlSi coatings in initial conditions and after a test was in a range from 30 to 40 μm. The structure of the silicon-modified aluminide coatings is as following: the outer zone consisting of the TiAl3 phase and titanium silicides / the middle zone consisting of columnar titanium silicides in phase TiAl3 matrix / the inner zone consisting of TiAl2 phase. Basic changes were related to differences in thickness in sublayers.Research limitations/implications: The discussed research proves that main reason of much better protection of TiAlSi coated base alloy is related to high microstructure stability of Si modified in TiAl3 phases. In addition silicon decreases activity of titanium, and in consequence the susceptibility of Al to selective oxidation is much stronger. The presence of Si due to Ti-Si phase generation with high oxidation resistance is presented.Practical implications: The slurry method can be applied in aerospace and automotive industry as low-cost technology in production of aluminide coatings on intermetallics.Originality/value: New method of aluminide coatings deposition on TiAl alloys.

  17. Effect of Al2O3 mole fraction and cooling method on vitrification of an artificial hazardous material. Part 1: variation of crystalline phases and slag structures.

    Science.gov (United States)

    Kuo, Yi-Ming; Huang, Kuo-Lin; Wang, Chih-Ta; Wang, Jian-Wen

    2009-09-30

    This study investigated how Al ions affect slag structure. During vitrification, pure Al(2)O(3), CaO, and SiO(2) served as the encapsulation phases with the use of Al mol% as an operating parameter. All specimens with the same basicity (mass ratio of CaO to SiO(2)) of 2/3 were vitrified at 1400 degrees C and cooled by air cooling or water quenching. XRD was used to measure the volume fractions of crystalline and amorphous phases. In a non-Al environment, CaSiO(3) was formed in air-cooled and water-quenched slags. With the addition of Al(2)O(3), no crystalline phases were observed in water-quenched slags. With the increase of Al mol% in specimens, the Al ions in air-cooled slags initially acted as an intermediate linking one tetrahedron chain to another and reducing the amount of crystalline phase, then behaved as a network former making the slags amorphous, and finally replaced Si ions in silicate frames to generate a large amount of CaAl(2)Si(2)O(8). Air cooling improved the formation of crystallize structures with more leachable metal ions. A highly crystallized Al-framed structure is not suitable for encapsulating hazardous metals in vitrified slags. PMID:19428182

  18. Madres y médicos en torno a la cuna: Ideas y prácticas sobre el cuidado infantil (Buenos Aires, 1930-1945 Mothers and doctors around the cradle: Practices and ideas about the child care. (Buenos Aires, 1930-1945

    Directory of Open Access Journals (Sweden)

    María José Billorou

    2007-12-01

    Full Text Available En la ciudad de Buenos Aires, desde mediados de la década de 1930 con la creación de la Sociedad de Puericultura, se intensificó la acción desarrollada por la Dirección de Protección a la Primera Infancia en el seno de la Asistencia Pública desde 1908. La disminución de la mortalidad infantil, objetivo central de la labor de ambas instituciones, se había logrado a través de la puesta en práctica de un programa de protección infantil. Los Dispensarios e Institutos de Puericultura se convirtieron en los espacios de encuentro diario entre puericultores y madres e hijos, en los cuales irrumpió una realidad compleja y cambiante que excedió la asistencia médica-educativa, consolidó la acción social y resquebrajó el ideal maternal vigente.In Buenos Aires, in the middle of the decade de 1930 with the creation of the Sociedad de Puericultura, the action developed by the Dirección de Protección a la Primera Infancia from 1908 inside the Asistencia Pública, was intensified. The decrease of infant mortality, principal objective of the both institution's work, it was achieved through perfomance a children's protection program. The dispensaries and the Institutes of Puericultura, turned in the spaces of everyday meeting between puericultores, mothers and sons, where penetrated a complex and fickle reality which exceeded the medical and educative attendance, consolidated welfare and splited the valid maternal ideal.

  19. Sights from the air

    Science.gov (United States)

    Tartara, P.

    2009-04-01

    The first aerial shots were taken by aerostat balloon during the second half of the nineteen century for military purpose and subsequently utilized for civilian, archaeological and town planning uses (Roman Forum 1900, Pompei 1910, Venezia 1913, etc.). Sights from the air have given the most objective representation of the landscape and traces progressively left by human activities. After the First World War the use of airplanes for photogrammetric shots suitable to create cartography (territorial map making) has permitted to realize a good basic documentation; successively it has been increased by aerial reconnaissance during the Second World War. Aerial shots by RAF, USAF and Luftwaffe brought to the establishment of rich aerial photograph Archives, particularly in Europe, which have had a very low utilization for the historical restoration of landscape. From the fifties, aerial documentation becomes systematic for different scale analysis and territorial planning. The use of satellite imagery and multispectral bands integrates the historical and recent aerial photographs; the former is particularly helpful for cartography updating, for large scale environmental analysis, for study and research of territories with not available air photographs or lacking in aerial shots. The amount and density of archaeological buried evidences, unknown at the most, is very substantial in Italy and in the whole Mediterranean area; here air-photo interpretation is being applied at advanced levels, but not systematically, since several decades. Some archaeological research teams, working for the knowledge of territorial cultural heritage, utilize historical and recent aerial photographs intensively (aerial photographs previous the II WW, just before the intensive and extensive use of mechanical means to till the land, preserve a large amount of traces or cropmarks of buried evidences; recent shots taken on different conditions of climate and crops, allow to see and read important

  20. Air climate health

    International Nuclear Information System (INIS)

    'France Nature Environnement Ile de France' publishes, on occasion of the COP 21, a special paper about the air pollution in the Paris region, greenhouse gases and their influence on the environment. This document has been written in close cooperation with professionals and civil associations. Elected representatives from local and regional authorities also speak about their experiences. The first part emphasizes the urgency to accelerate preventive and corrective measures since the air pollution, after slightly decreasing in the 2000's, remains stable. Our work is a science based analysis of essential parameters and details the impact of local pollution and greenhouse gases on the climate. It is based on the GIEC 2013 and 2015 reports, as well as the work of National meteorology in association with the Climate agency of Paris. The threshold of not exceeding an average temperature of +2 deg. C in 2100 is almost reached. If consumption of fossil energies does not heavily decline in the next 10 years, the earth's thermal machine will enter, for several centuries, into an uncontrollable cycle which could endanger life on earth with average temperatures exceeding 4 to 6 deg. C above the current level. The second part reveals the impact of air pollution on the health of the Paris region's population, especially on women who are the most affected by respiratory diseases: obstructive pulmonary bronchitis and asthma. Four departments are particularly affected: Paris, Seine-et-Marne, Seine-Saint-Denis and Val-d'Oise. Even though we do not have the formal causal proof between gas concentration and disease, analysis of similar situations worldwide eliminate any doubts about the reality of the relationship. The third part proposes solutions which can be implemented by local government, companies, but also civil associations and citizens in order to quickly decrease greenhouse gas production. Solutions range from energy sobriety to change in travel

  1. Friction and wear properties of Ti6Al4V/WC-Co in cold atmospheric plasma jet

    Science.gov (United States)

    Xu, Wenji; Liu, Xin; Song, Jinlong; Wu, Libo; Sun, Jing

    2012-10-01

    The friction and wear properties of Ti6Al4V/WC-Co friction pair were studied using an autonomous atmospheric pressure bare electrode cold plasma jet generating device and block-on-ring friction/wear tester, respectively. The study was conducted under air, air jet, nitrogen jet, air cold plasma jet, and nitrogen cold plasma jet atmospheres. Both nitrogen cold and air cold plasma jets effectively reduced the friction coefficients of the friction pairs and decreased friction temperature. The friction coefficient in the nitrogen cold plasma jet decreased to almost 60% compared with that in the air. The scanning electron microscope, energy-dispersive X-ray spectroscope, and X-ray diffraction analyses illustrated that adhesive wear was relieved and the friction surfaces of Ti6Al4V were smoother, both in the nitrogen cold and air cold plasma jets. The roughness value Ra of the Ti6Al4V friction surfaces can reach 1.107 μm. A large number of nitrogen particles in the ionic and excited states contained by cold plasma jets reacts easily on the friction surface to produce a large amount of nitrides, which can excellently reduce the wear of Ti6Al4V/WC-Co friction pairs in real-time.

  2. 76 FR 38700 - United States, et al.

    Science.gov (United States)

    2011-07-01

    ... Antitrust Division United States, et al. v. American Express Company, et al.; Public Comments and Response...), the United States hereby publishes below its Response to public comments received on the proposed Final Judgment in United States, et al. v. American Express Company, et al., Civil Action No....

  3. Large rectification magnetoresistance in nonmagnetic Al/Ge/Al heterojunctions.

    Science.gov (United States)

    Zhang, Kun; Li, Huan-Huan; Grünberg, Peter; Li, Qiang; Ye, Sheng-Tao; Tian, Yu-Feng; Yan, Shi-Shen; Lin, Zhao-Jun; Kang, Shi-Shou; Chen, Yan-Xue; Liu, Guo-Lei; Mei, Liang-Mo

    2015-09-21

    Magnetoresistance and rectification are two fundamental physical properties of heterojunctions and respectively have wide applications in spintronics devices. Being different from the well known various magnetoresistance effects, here we report a brand new large magnetoresistance that can be regarded as rectification magnetoresistance: the application of a pure small sinusoidal alternating-current to the nonmagnetic Al/Ge Schottky heterojunctions can generate a significant direct-current voltage, and this rectification voltage strongly varies with the external magnetic field. We find that the rectification magnetoresistance in Al/Ge Schottky heterojunctions is as large as 250% at room temperature, which is greatly enhanced as compared with the conventional magnetoresistance of 70%. The findings of rectification magnetoresistance open the way to the new nonmagnetic Ge-based spintronics devices of large rectification magnetoresistance at ambient temperature under the alternating-current due to the simultaneous implementation of the rectification and magnetoresistance in the same devices.

  4. Al/Au/n-Si/Al surface barrier detector

    International Nuclear Information System (INIS)

    Charged-particle detectors are required to be operated sometimes in ambient light for applications like alpha counting and range finding. Detectors like Al/p-Si surface barrier with aluminium on the front side are found quite suitable. Gold/n-Si surface barrier detectors are not usable because of their excessive background photo current. These detectors, we fabricate for use in nuclear experiments, were given an aluminium coating on their gold side for use in room light. The Au/n-Si/Al surface barrier diodes were characterized for their electrical properties and performance as alpha detectors. Detectors showing good energy resolution (∼ 50 KeV) were selected and provided with another thin reflecting coat of aluminium on their front sides

  5. ASPECTOS AMBIENTALES EN LA EXPERIMENTACIÓN QUÍMICA PARA PREVENIR RIESGOS A LA SALUD Y AL AMBIENTE

    OpenAIRE

    María O. Peña O.; Esperanza González Q.; Walter Ramírez M.; Sergio A. Franco Ch.

    2011-01-01

    Un aspecto ambiental se considera como cualquier material o elemento físico o químico que el hombre arroja al agua, al aire y al suelo o que interactúe con el ambiente y propicie un riesgo para la salud y para el medio ambiente. Los residuos originados durante el desarrollo de actividades relacionadas con la experimentación química, aunque en una proporción menor que en un proceso industrial, ellos pueden ser residuos peligrosos al medio ambiente. Los aspectos ambientales se asocian con las a...

  6. Air ions and aerosol science

    Science.gov (United States)

    Tammet, Hannes

    1996-03-01

    Collaboration between Gas Discharge and Plasma Physics, Atmospheric Electricity, and Aerosol Science is a factor of success in the research of air ions. The concept of air ion as of any carrier of electrical current through the air is inherent to Atmospheric Electricity under which a considerable statistical information about the air ion mobility spectrum is collected. A new model of air ion size-mobility correlation has been developed proceeding from Aerosol Science and joining the methods of neighboring research fields. The predicted temperature variation of the mobility disagrees with the commonly used Langevin rule for the reduction of air ion mobilities to the standard conditions. Concurrent errors are too big to be neglected in applications. The critical diameter distinguishing cluster ions and charged aerosol particles has been estimated to be 1.4-1.8 nm.

  7. Air ions and aerosol science

    Energy Technology Data Exchange (ETDEWEB)

    Tammet, H. [Department of Environmental Physics, Tartu University, Tartu, Estonia (Estonia) 2400

    1996-03-01

    Collaboration between Gas Discharge and Plasma Physics, Atmospheric Electricity, and Aerosol Science is a factor of success in the research of air ions. The concept of air ion as of any carrier of electrical current through the air is inherent to Atmospheric Electricity under which a considerable statistical information about the air ion mobility spectrum is collected. A new model of air ion size-mobility correlation has been developed proceeding from Aerosol Science and joining the methods of neighboring research fields. The predicted temperature variation of the mobility disagrees with the commonly used Langevin rule for the reduction of air ion mobilities to the standard conditions. Concurrent errors are too big to be neglected in applications. The critical diameter distinguishing cluster ions and charged aerosol particles has been estimated to be 1.4{endash}1.8 nm. {copyright} {ital 1996 American Institute of Physics.}

  8. Femtosecond laser ablation and nanoparticle formation in intermetallic NiAl

    Science.gov (United States)

    Jorgensen, David J.; Titus, Michael S.; Pollock, Tresa M.

    2015-10-01

    The ablation behavior of a stoichiometric intermetallic compound β-NiAl subjected to femtosecond laser pulsing in air has been investigated. The single-pulse ablation threshold for NiAl was determined to be 83 ± 4 mJ/cm2 and the transition to the high-fluence ablation regime occurred at 2.8 ± 0.3 J/cm2. Two sizes of nanoparticles consisting of Al, NiAl, Ni3Al and NiO were formed and ejected from the target during high-fluence ablation. Chemical analysis revealed that smaller nanoparticles (1-30 nm) tended to be rich in Al while larger nanoparticles (>100 nm) were lean in Al. Ablation in the low-fluence regime maintained this trend. Redeposited material and nanoparticles remaining on the surface after a single 3.7 J/cm2 pulse, one hundred 1.7 J/cm2 pulses, or one thousand 250 mJ/cm2 pulses were enriched in Al relative to the bulk target composition. Further, the surface of the irradiated high-fluence region was depleted in Al indicating that the fs laser ablation removal rate of the intermetallic constituents in this regime does not scale with the individual pure element ablation thresholds.

  9. Bulk Synthesis and Characterization of Ti3Al Nanoparticles by Flow-Levitation Method

    Directory of Open Access Journals (Sweden)

    Shanjun Chen

    2013-01-01

    Full Text Available A novel bulk synthesis method for preparing high pure Ti3Al nanoparticles was developed by flow-levitation method (FL. The Ti and Al vapours ascending from the high temperature levitated droplet were condensed by cryogenic Ar gas under atmospheric pressure. The morphology, crystalline structure, and chemical composition of Ti3Al nanoparticles were, respectively, investigated by transmission electron microscopy, X-ray diffraction, and inductively coupled plasma atomic emission spectrometry. The results indicated that the Ti3Al powders are nearly spherical-shaped, and the particle size ranges from several nanometers to 100 nm in diameter. Measurements of the d-spacing from X-ray (XRD and electron diffraction studies confirmed that the Ti3Al nanoparticles have a hexagonal structure. A thin oxidation coating of 2-3 nm in thickness was formed around the particles after exposure to air. Based on the XPS measurements, the surface coating of the Ti3Al nanoparticles is a mixture of Al2O3 and TiO2. The production rate of Ti3Al nanoparticles was estimated to be about 3 g/h. This method has a great potential in mass production of Ti3Al nanoparticles.

  10. Electrochemical performance of solid-state lithium-air batteries using carbon nanotube catalyst in the air electrode

    Energy Technology Data Exchange (ETDEWEB)

    Kitaura, Hirokazu; Zhou, Haoshen [Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology, Umezono, Tsukuba (Japan)

    2012-07-15

    Solid-state lithium-air cells using lithium anode, a polymer electrolyte, Li{sub 1+x+y}Al{sub x}(Ti, Ge){sub 2-x}Si{sub y}P{sub 3-y}O{sub 12} inorganic solid electrolyte, and an air electrode composed of carbon nanotubes and an inorganic solid electrolyte are constructed and their electrochemical properties investigated. The cells show a reversible capacity of about 400 mA h g{sup -1} during the first few cycles. The rate performance and impedance measurements are also examined. The large cell resistance, which mainly comes from the interfacial resistance between Li and the polymer electrolyte, limits the rate performance. The results indicate that such all-solid-state lithium-air batteries without polymer electrolytes have good potential for development. (Copyright copyright 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

  11. The Cost of Air Pollution

    OpenAIRE

    World Bank; Institute for Health Metrics and Evaluation

    2016-01-01

    The Cost of Air Pollution: Strengthening the economic case for action, a joint study of the World Bank and the Institute for Health Metrics and Evaluation (IHME), seeks to estimate the costs of premature deaths related to air pollution, to strengthen the case for action and facilitate decision making in the context of scarce resources. An estimated 5.5 million lives were lost in 2013 to diseases associated with outdoor and household air pollution, causing human suffering and reducing economic...

  12. Atmospheric Chemistry and Air Pollution

    OpenAIRE

    Gaffney, Jeffrey S.; Marley, Nancy A.

    2003-01-01

    Atmospheric chemistry is an important discipline for understanding air pollution and its impacts. This mini-review gives a brief history of air pollution and presents an overview of some of the basic photochemistry involved in the production of ozone and other oxidants in the atmosphere. Urban air quality issues are reviewed with a specific focus on ozone and other oxidants, primary and secondary aerosols, alternative fuels, and the potential for chlorine releases to amplify oxidant chemistry...

  13. Natural Flow Air Cooled Photovoltaics

    Science.gov (United States)

    Tanagnostopoulos, Y.; Themelis, P.

    2010-01-01

    Our experimental study aims to investigate the improvement in the electrical performance of a photovoltaic installation on buildings through cooling of the photovoltaic panels with natural air flow. Our experimental study aims to investigate the improvement in the electrical performance of a photovoltaic installation on buildings through cooling of the photovoltaic panels with natural air flow. We performed experiments using a prototype based on three silicon photovoltaic modules placed in series to simulate a typical sloping building roof with photovoltaic installation. In this system the air flows through a channel on the rear side of PV panels. The potential for increasing the heat exchange from the photovoltaic panel to the circulating air by the addition of a thin metal sheet (TMS) in the middle of air channel or metal fins (FIN) along the air duct was examined. The operation of the device was studied with the air duct closed tightly to avoid air circulation (CLOSED) and the air duct open (REF), with the thin metal sheet (TMS) and with metal fins (FIN). In each case the experiments were performed under sunlight and the operating parameters of the experimental device determining the electrical and thermal performance of the system were observed and recorded during a whole day and for several days. We collected the data and form PV panels from the comparative diagrams of the experimental results regarding the temperature of solar cells, the electrical efficiency of the installation, the temperature of the back wall of the air duct and the temperature difference in the entrance and exit of the air duct. The comparative results from the measurements determine the improvement in electrical performance of the photovoltaic cells because of the reduction of their temperature, which is achieved by the naturally circulating air.

  14. Managing Air in Olympic Cities

    Directory of Open Access Journals (Sweden)

    Qing W. Tian

    2008-01-01

    Full Text Available The 21st century Olympic Agenda aims to align itself with the concept of sustainable development and has driven improved environmental quality in host cities, such as the Green Games in Sydney 2000 and the planned Beijing 2008 Games and in London 2012 as the Low Carbon Games. Air quality has long been a concern of Olympic mega-cities, although the air quality plans and strategies have often seemed short-lived and unsustainable in the long term. We have explored air quality data and air pollution control from seven Olympic cities: Mexico City, Los Angeles, Atlanta, Sydney and Athens and also Beijing and London which will host Olympic Games in near future. The study shows that despite a high altitude and air pollution problems, Mexico City had no clear environmental policy in place for the 1968 games. The characteristic smog of Los Angeles raised concerns about athletic performance at the Olympic Games of 1984, but there were limited efforts to tackle the ozone concentration during these games. The 1996 Atlanta Games represents a case where temporary public transport changes were used as a tactic to reduce air pollution. In Sydney a well planned sustainable strategy reduced air pollutants and CO2 emissions in 2000, but Athens' long efforts to improve air quality for the 2004 games were not wholly effective. Even where strategies proved successful the improvements in air quality seem short-lived. Current host cities Beijing and London are developing emission reduction plans. These have clear air quality objectives and are well intentioned. However, the improvements may be too narrow and may not be sustainable in the long term. Our analysis looks at the origins of success and failure and how more coherent improvements might be achieved and what would promote sustainable plans for air quality management at future games. The study illustrates the feedback between air pollution science and policy awareness.

  15. Air and metal hydride battery

    Energy Technology Data Exchange (ETDEWEB)

    Lampinen, M.; Noponen, T. [Helsinki Univ. of Technology, Otaniemi (Finland). Lab. of Applied Thermodynamics

    1998-12-31

    The main goal of the air and metal hydride battery project was to enhance the performance and manufacturing technology of both electrodes to such a degree that an air-metal hydride battery could become a commercially and technically competitive power source for electric vehicles. By the end of the project it was possible to demonstrate the very first prototype of the air-metal hydride battery at EV scale, achieving all the required design parameters. (orig.)

  16. Photochemical air pollution syndrome

    Energy Technology Data Exchange (ETDEWEB)

    Hamming, W.J.; MacBeth, W.C.; Chass, R.L.

    1967-01-01

    There are two distinct pollution problems in the Los Angeles Basin - one in winter, the other most frequently in summer and fall. In winter the concentrations of carbon monoxide, nitrogen oxides, sulfur dioxide and black filterable aerosols are higher than in summer, but the secondary pollutants such as ozone and photochemical oxidants are not as high. The photochemical air pollution syndrome is due to a pattern set by previous smog attacks. This pattern is due to low wind speeds, low inversion heights, a trajectory to carry the pollution and sufficient sunlight to photodissociate the nitrogen dioxide formed and to form nitric oxide and atomic oxygen. The results are high levels of oxidant or ozone and large quantities of particles. 5 references, 9 figures, 7 tables.

  17. de Buenos Aires

    Directory of Open Access Journals (Sweden)

    Joaquín Linne

    2014-01-01

    Full Text Available Esta investigación explora la situación de los cibercafés en la Ciudad de Buenos Aires y de su principalpoblación, los adolescentes de sectores populares. Aunque en los últimos años millones de adolescentes abandonaronestos espacios como consecuencia de la ampliación de la Internet hogareña, en sectores popularesmuchos adolescentes aún continúan asistiendo en busca de recreación lúdico-comunicativa, información eintegración social. La metodología utilizada consiste en 40 entrevistas en profundidad, observaciones participantesy análisis de contenido de perfiles de Facebook (n: 200. Entre los resultados, se destaca que lasprincipales prácticas de estos adolescentes son comunicativas y que estos espacios funcionan para ellos comoherramientas de alfabetización digital, sociabilidad entre pares e inclusión ciudadana.

  18. metropolitana en Buenos Aires

    Directory of Open Access Journals (Sweden)

    Pedro Pírez

    2006-01-01

    Full Text Available In this paper, we present a description of some concrete processes that made up the transformations in the metropolitan configuration and functioning in Buenos Aires in the 1990s during the 20th Century. We are referring to components related to the impact of processes at the macro level (national and international pertaining to restructuring and globalisation. We aim to understand the “forces” that mediate between the global and the local arenas, identifying the actors and the relationships behind metropolitan changes as well as searching for the meaning that the city acquires and which is understood as “privatisation”. In the first section of the paper, this concept is made explicit.

  19. Air Composition and Chemistry

    Science.gov (United States)

    Brimblecombe, Peter

    1996-01-01

    This book is about the atmosphere and humanity's influence on it. For this new edition, Brimblecombe has rewritten and updated much of the book. In the early chapters, he discusses the geochemical, biological and maritime sources of the trace gases. Next, he examines the chemistry of atmospheric gases, suspended particles, and rainfall. After dealing with the natural atmosphere, he examines the sources of air pollution and its effects, with all scenarios updated from the last edition. Scenarios include decline in health, damage to plants and animals, indoor pollution, and acid rain. The final chapters, also revised, are concerned with the chemistry and evolution of the atmospheres of the planets of the solar system. Students with an interest in chemistry and the environmental sciences will find this book highly valuable.

  20. Heavy ion elastic recoil detection analysis of Al{sub x}O{sub y}/Pt/Al{sub x}O{sub y} multilayer selective solar absorber

    Energy Technology Data Exchange (ETDEWEB)

    Nuru, Z.Y., E-mail: zebibnate@yahoo.com [Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Old Faure Road, 7129 Somerset West (South Africa); Dept. of Physics, University of Western Cape, Private Bag X 17, Bellville 7535 (South Africa); UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk ridge, PO Box 392, Pretoria South Africa (South Africa); Msimanga, M. [iThemba LABS Gauteng, Private Bag 11, WITS, 2050 Johannesburg (South Africa); Arendse, C.J. [Dept. of Physics, University of Western Cape, Private Bag X 17, Bellville 7535 (South Africa); Maaza, M. [Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Old Faure Road, 7129 Somerset West (South Africa); Council for Scientific and Industrial Research, P O Box 395, Pretoria 0001 (South Africa); UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk ridge, PO Box 392, Pretoria South Africa (South Africa)

    2014-04-01

    Highlights: • Al{sub x}O{sub y}/Pt/Al{sub x}O{sub y} solar absorber was thermally stable in air up to 500 °C for 2 h. • Al{sub x}O{sub y}/Pt/Al{sub x}O{sub y} solar absorber was investigated using HI-ERDA. • The cause of degradation of the coatings above 500 °C was identified. • An outward diffusion of Cu substrate towards the coating was observed at 600 °C. • At 700 °C, formation of CuO and Cu{sub 2}O phases were confirmed. - Abstract: An Al{sub x}O{sub y}/Pt/Al{sub x}O{sub y} multilayer solar absorber for use in solar-thermal applications has been deposited onto copper substrate by electron beam (e-beam) vacuum evaporation at room temperature. Different samples were annealed at different temperatures in air and characterized by spectrophotometry, emissometry, heavy ion elastic recoil detection analysis (HI-ERDA), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDS). The Al{sub x}O{sub y}/Pt/Al{sub x}O{sub y} multilayer solar absorbers heated up to 500 °C were found to exhibit good spectral selectivity (α/ε) of 0.951/0.08. However, beyond 500 °C the spectral selectivity decreased to 0.846/0.11, possibly due to thermally activated atomic interdiffusion profiles. HI-ERDA has been used to study depth-dependent atomic concentration profiles. These measurements revealed outward diffusion of the copper substrate towards the surface and therefore, the decrease in the constituents of the coating. The decrease in the intensity of Pt grains and formation of CuO and Cu{sub 2}O phases at 700 °C were confirmed by XRD and EDS.