Sample records for nas escalas espaciais

  1. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM COMBUSTÃO E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM COMBUSTÃO E PROPULSÃO Adaptação Obrigatórias para o mestrado PCP

  2. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM COMBUSTÃO E Mendonça do IAE/CTA, Univ. Pennsylvania, USA, 1997 #12;CURSO DE ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE

  3. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E GERENCIAMENTO Tecnologia de Satélites petronio.souza@lit.inpe.br CSE-201-4 Introdução à Engenharia de Sistemas Espaciais

  4. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E GERENCIAMENTO DE SISTEMAS ESPACIAIS 1º Período Obrigatória para o Mestrado e o Doutorado CSE-200-4 Introdução à Tecnologia de Satélites otavio

  5. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E GERENCIAMENTO DE SISTEMAS ESPACIAIS 1º Período Obrigatória para o Mestrado e o Doutorado CSE-200-4 Introdução à Tecnologia de Satélites petronio

  6. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E;2 CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E Tecnologia de Satélites petronio.souza@lit.inpe.br CSE-201-4 Introdução à Engenharia de Sistemas Espaciais

  7. MINISTRIO DA CINCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS

    E-print Network

    Domingues, Margarete Oliveira

    MINISTÉRIO DA CIÊNCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS CENTRO ESPACIAL DE;MINISTÉRIO DA CIÊNCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS CENTRO ESPACIAL DE CACHOEIRA/CP ÓRGÃO SUBORDINADO AO MINISTÉRIO DE CIÊNCIA E TECNOLOGIA UNIDADE GESTORA No 240108 FINALIDADE ESSENCIAL E

  8. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM ENGENHARIA E, ITA, Brasil, 1990 #12;2 CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE Doutorado CSE-200-4 Introdução à Tecnologia de Satélites CSE-201-4 Introdução à Engenharia de Sistemas

  9. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM MECÂNICA TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM MECÂNICA ESPACIAL E CONTROLE RELAÇÃO DAS DISCIPLINAS SEPARADAS Ciência, Engenharia e Tecnologia I CMC-325-3 Teoria de Visualização Gráfica Tridimensional I: Algoritmos

  10. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM CIÊNCIA E TECNOLOGIA DE MATERIAIS E SENSORES Coordenador Acadêmico do Curso Evandro Marconi Rocco Coordenador Acadêmico TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM CIÊNCIA E TECNOLOGIA DE MATERIAIS E SENSORES 1o Período Letivo

  11. MINISTRIO DA CINCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS

    E-print Network

    Domingues, Margarete Oliveira

    MINISTÉRIO DA CIÊNCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS CENTRO ESPACIAL DE;MINISTÉRIO DA CIÊNCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS CENTRO ESPACIAL DE CACHOEIRA SUBORDINADO AO MINISTÉRIO DE CIÊNCIA E TECNOLOGIA UNIDADE GESTORA No 240108 FINALIDADE ESSENCIAL E ATRIBUIÇÕES

  12. Ministrio da Cincia e Tecnologia Instituto Nacional de Pesquisas Espaciais

    E-print Network

    Ministério da Ciência e Tecnologia Instituto Nacional de Pesquisas Espaciais Plano Diretor 2011 Departamento de Ciência e Tecnologia Aeroespacial DEGRAD Sistema de monitoramento da degradação florestal na da exploração seletiva da floresta Amazônica ETE Coordenação Geral de Engenharia e Tecnologia

  13. Ministrio da Cincia e Tecnologia Instituto Nacional de Pesquisas Espaciais

    E-print Network

    Ministério da Ciência e Tecnologia Instituto Nacional de Pesquisas Espaciais Centro Regional Sul de atividades de geração e transferência de tecnologia e na formação de recursos humanos; 3.4 Manter vínculo

  14. REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, REA DE CONCENTRAO

    E-print Network

    REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, ÁREA DE CONCENTRAÇÂO EM Espacial e Controle (CMC) do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) objetiva Conselho de Pós-Graduação, pelo Regimento do Curso de Pós-Graduação em Engenharia e Tecnologia Espaciais e

  15. REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM e Tecnologia Espaciais (ETE) objetiva formar e aperfeiçoar pessoal nos níveis de Mestrado e de Curso de Pós- graduação em Engenharia e Tecnologia Espaciais e por este Regimento de Área de

  16. REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÃO EM e Tecnologia Espaciais (ETE) objetiva formar e aperfeiçoar pessoal nos níveis de Mestrado e de Curso de Pós-graduação em Engenharia e Tecnologia Espaciais e por este Regimento de Área de Concentração

  17. REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, REA DE CONCENTRAO EM

    E-print Network

    REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, ÁREA DE CONCENTRAÇÂO EM Propulsão (PCP) do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) objetiva formar e de Pós-Graduação, pelo Regimento do Curso de Pós- Graduação em Engenharia e Tecnologia Espaciais e

  18. REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, REA DE

    E-print Network

    REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, ÁREA DE CONCENTRAÇÃO EM Espacial e Controle (CMC) do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) objetiva de Pós-Graduação, pelo Regimento do Curso de Pós- Graduação em Engenharia e Tecnologia Espaciais e

  19. REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS ÁREA DE CONCENTRAÇÂO EM e Tecnologia Espaciais (ETE) objetiva formar e aperfeiçoar pessoal nos níveis de Mestrado e de Curso de Pós- graduação em Engenharia e Tecnologia Espaciais e por este Regimento de Área de

  20. REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, REA DE

    E-print Network

    REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS, ÁREA DE CONCENTRAÇÂO EM Espacial e Controle (CMC) do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) objetiva de Pós-Graduação, pelo Regimento do Curso de Pós- Graduação em Engenharia e Tecnologia Espaciais e

  1. MINISTRIO DA CINCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS

    E-print Network

    Domingues, Margarete Oliveira

    1 MINISTÉRIO DA CIÊNCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS RELATÓRIO DE GESTÃO DO INPE ANO 2002 Unidade Gestora São José dos Campos - SP #12;2 MINISTÉRIO DA CIÊNCIA E TECNOLOGIA Regimental do MCT (Ministério da Ciência e Tecnologia), em 09.12.2002, através do Decreto n°?3.568, o INPE

  2. MINISTRIO DA CINCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS

    E-print Network

    Domingues, Margarete Oliveira

    1 MINISTÉRIO DA CIÊNCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS RELATÓRIO DE GESTÃO DO INPE ANO 2001 Unidade Gestora São José dos Campos - SP #12;2 MINISTÉRIO DA CIÊNCIA E TECNOLOGIA e Tecnologia. Sua principal finalidade é "promover e executar estudos, pesquisas científicas

  3. REGIMENTO DO CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM ENGENHARIA E TECNOLOGIA ESPACIAIS TÍTULO I DOS OBJETIVOS DO CURSO Art. 1o ­ O Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) do INPE, com Tecnologia de Materiais e Sensores (CMS), doravante denominado Curso, objetiva formar e aperfeiçoar pessoal

  4. Instituto Nacional de Pesquisas Espaciais Av. dos Astronautas, 1758 So Jos dos Campos, SP.

    E-print Network

    Instituto Nacional de Pesquisas Espaciais Av. dos Astronautas, 1758 ­ São José dos Campos, SP? #12;8) Num experimento de espalhamento de partículas de altas energias, verifica- se que as partículas

  5. Interpoladores Espaciais para Gerao de Superfcies de Densidade Populacional na Amaznia Brasileira: problemas e perspectivas.

    E-print Network

    Camara, Gilberto

    Interpoladores Espaciais para Geração de Superfícies de Densidade Populacional na Amazônia de superfícies de densidade populacional na Amazônia Brasileira. Os principais problemas de mais utilizados para gerar superfícies de densidade populacional. Discute-se a aplicabilidade destes

  6. NATIONAL ALCOHOL SURVEY (NAS)

    EPA Science Inventory

    National Alcohol Survey (NAS) is designed to assess the trends in drinking practices and problems in the national population, including attitudes, norms, treatment and experiences and adverse consequences. It also studies the effects of public policy on drinking practices (i.e., ...

  7. NAS Parallel Benchmarks Results

    NASA Technical Reports Server (NTRS)

    Subhash, Saini; Bailey, David H.; Lasinski, T. A. (Technical Monitor)

    1995-01-01

    The NAS Parallel Benchmarks (NPB) were developed in 1991 at NASA Ames Research Center to study the performance of parallel supercomputers. The eight benchmark problems are specified in a pencil and paper fashion i.e. the complete details of the problem to be solved are given in a technical document, and except for a few restrictions, benchmarkers are free to select the language constructs and implementation techniques best suited for a particular system. In this paper, we present new NPB performance results for the following systems: (a) Parallel-Vector Processors: Cray C90, Cray T'90 and Fujitsu VPP500; (b) Highly Parallel Processors: Cray T3D, IBM SP2 and IBM SP-TN2 (Thin Nodes 2); (c) Symmetric Multiprocessing Processors: Convex Exemplar SPP1000, Cray J90, DEC Alpha Server 8400 5/300, and SGI Power Challenge XL. We also present sustained performance per dollar for Class B LU, SP and BT benchmarks. We also mention NAS future plans of NPB.

  8. Observações simultâneas no óptico e infravermelho próximo dos BL Lacs PKS 2005-489 e PKS 2155-304 em diversas escalas de tempo

    NASA Astrophysics Data System (ADS)

    Dominici, T. P.; Abraham, Z.; Galo, A. L.

    2003-08-01

    A existência de variações rápidas de brilho em alguns blazares é um fenômeno bem comprovado, mas até agora não sabemos ao certo quais são os mecanismos físicos envolvidos. A maior dificuldade é a ausência de observações multibanda simultâneas que poderiam fornecer vínculos aos modelos. Buscando colaborar com a discussão estudamos o comportamento de dois BL Lacs, PKS 2005-489 e PKS 2155-304, em relação à variabilidade em diversas escalas de tempo, de poucos minutos até vários meses, com observações simultâneas em seis bandas espectrais (óptico e infravermelho próximo). Para tanto dois telescópios do LNA foram utilizados em conjunto nas campanhas observacionais realizadas em 2001 e 2002, cujos resultados são apresentados aqui. As duas fontes apresentaram características bastante diferentes, inclusive em relação à existência de variabilidade nos índices espectrais. Particularmente, registramos a primeira detecção de variações em escalas de tempo da ordem de poucos minutos em PKS 2005-489, com evidências da presença de um atraso entre as curvas de luz nas bandas V e R e a variação em R ocorrendo antes (o contrário do esperado no modelo de shock-in-jet). Em PKS 2155-304 detectamos pela primeira vez variabilidade em escalas de tempo de poucos minutos no infravermelho em um AGN. As observações indicam que as variações de brilho em blazares são o resultado da ação de mais de um fenômeno, especialmente em escalas de tempo muito curtas. Alguns cenários físicos são sugeridos para explicar os resultados observacionais.

  9. NAS Applications and Advanced Algorithms

    NASA Technical Reports Server (NTRS)

    Bailey, David H.; Biswas, Rupak; VanDerWijngaart, Rob; Kutler, Paul (Technical Monitor)

    1997-01-01

    This paper examines the applications most commonly run on the supercomputers at the Numerical Aerospace Simulation (NAS) facility. It analyzes the extent to which such applications are fundamentally oriented to vector computers, and whether or not they can be efficiently implemented on hierarchical memory machines, such as systems with cache memories and highly parallel, distributed memory systems.

  10. NASA's UAS NAS Access Project

    NASA Technical Reports Server (NTRS)

    Johnson, Charles W.

    2011-01-01

    The vision of the Unmanned Aircraft System (UAS) Integration in the National Airspace System (NAS) Project is "A global transportation system which allows routine access for all classes of UAS." The goal of the UAS Integration in the NAS Project is to "contribute capabilities that reduce technical barriers related to the safety and operational challenges associated with enabling routine UAS access to the NAS." This goal will be accomplished through a two-phased approach based on development of system-level integration of key concepts, technologies and/or procedures, and demonstrations of integrated capabilities in an operationally relevant environment. Phase 1 will take place the first two years of the Project and Phase 2 will take place the following three years. The Phase 1 and 2 technical objectives are: Phase 1: Developing a gap analysis between current state of the art and the Next Generation Air Transportation System (NextGen) UAS Concept of Operations . Validating the key technical areas identified by this Project . Conducting initial modeling, simulation, and flight testing activities . Completing Sub-project Phase 1 deliverables (spectrum requirements, comparative analysis of certification methodologies, etc.) and continue Phase 2 preparation (infrastructure, tools, etc.) Phase 2: Providing regulators with a methodology for developing airworthiness requirements for UAS, and data to support development of certifications standards and regulatory guidance . Providing systems-level, integrated testing of concepts and/or capabilities that address barriers to routine access to the NAS. Through simulation and flight testing, address issues including separation assurance, communications requirements, and human systems integration in operationally relevant environments. The UAS in the NAS Project will demonstrate solutions in specific technology areas, which will address operational/safety issues related to UAS access to the NAS. Since the resource allocation for this Project is limited ($150M over the five years), the focus is on reducing the technical barriers where NASA has unique capabilities. As a result, technical areas, such as Sense and Avoid (SAA) and beyond line of sight command and control will not be addressed. While these are critical barriers to UAS access, currently, there is a great deal of global effort being exercised to address these challenge areas. Instead, specific technology development in areas where there is certainty that NASA can advance the research to high technology readiness levels will be the Project's focus. Specific sub-projects include Separation Assurance, Human Systems Integration, Communications, Certification, and Integrated Test and Evaluation. Each sub-project will transfer technologies to relevant key stakeholders and decision makers through research transition teams, technology forums, or through other analogous means.

  11. New NAS Parallel Benchmarks Results

    NASA Technical Reports Server (NTRS)

    Yarrow, Maurice; Saphir, William; VanderWijngaart, Rob; Woo, Alex; Kutler, Paul (Technical Monitor)

    1997-01-01

    NPB2 (NAS (NASA Advanced Supercomputing) Parallel Benchmarks 2) is an implementation, based on Fortran and the MPI (message passing interface) message passing standard, of the original NAS Parallel Benchmark specifications. NPB2 programs are run with little or no tuning, in contrast to NPB vendor implementations, which are highly optimized for specific architectures. NPB2 results complement, rather than replace, NPB results. Because they have not been optimized by vendors, NPB2 implementations approximate the performance a typical user can expect for a portable parallel program on distributed memory parallel computers. Together these results provide an insightful comparison of the real-world performance of high-performance computers. New NPB2 features: New implementation (CG), new workstation class problem sizes, new serial sample versions, more performance statistics.

  12. The NAS Computational Aerosciences Archive

    NASA Technical Reports Server (NTRS)

    Miceli, Kristina D.; Globus, Al; Lasinski, T. A. (Technical Monitor)

    1995-01-01

    In order to further the state-of-the-art in computational aerosciences (CAS) technology, researchers must be able to gather and understand existing work in the field. One aspect of this information gathering is studying published work available in scientific journals and conference proceedings. However, current scientific publications are very limited in the type and amount of information that they can disseminate. Information is typically restricted to text, a few images, and a bibliography list. Additional information that might be useful to the researcher, such as additional visual results, referenced papers, and datasets, are not available. New forms of electronic publication, such as the World Wide Web (WWW), limit publication size only by available disk space and data transmission bandwidth, both of which are improving rapidly. The Numerical Aerodynamic Simulation (NAS) Systems Division at NASA Ames Research Center is in the process of creating an archive of CAS information on the WWW. This archive will be based on the large amount of information produced by researchers associated with the NAS facility. The archive will contain technical summaries and reports of research performed on NAS supercomputers, visual results (images, animations, visualization system scripts), datasets, and any other supporting meta-information. This information will be available via the WWW through the NAS homepage, located at http://www.nas.nasa.gov/, fully indexed for searching. The main components of the archive are technical summaries and reports, visual results, and datasets. Technical summaries are gathered every year by researchers who have been allotted resources on NAS supercomputers. These summaries, together with supporting visual results and references, are browsable by interested researchers. Referenced papers made available by researchers can be accessed through hypertext links. Technical reports are in-depth accounts of tools and applications research projects performed by NAS staff members and collaborators. Visual results, which may be available in the form of images, animations, and/or visualization scripts, are generated by researchers with respect to a certain research project, depicting dataset features that were determined important by the investigating researcher. For example, script files for visualization systems (e.g. FAST, PLOT3D, AVS) are provided to create visualizations on the user's local workstation to elucidate the key points of the numerical study. Users can then interact with the data starting where the investigator left off. Datasets are intended to give researchers an opportunity to understand previous work, 'mine' solutions for new information (for example, have you ever read a paper thinking "I wonder what the helicity density looks like?"), compare new techniques with older results, collaborate with remote colleagues, and perform validation. Supporting meta-information associated with the research projects is also important to provide additional context for research projects. This may include information such as the software used in the simulation (e.g. grid generators, flow solvers, visualization). In addition to serving the CAS research community, the information archive will also be helpful to students, visualization system developers and researchers, and management. Students (of any age) can use the data to study fluid dynamics, compare results from different flow solvers, learn about meshing techniques, etc., leading to better informed individuals. For these users it is particularly important that visualization be integrated into dataset archives. Visualization researchers can use dataset archives to test algorithms and techniques, leading to better visualization systems, Management can use the data to figure what is really going on behind the viewgraphs. All users will benefit from fast, easy, and convenient access to CFD datasets. The CAS information archive hopes to serve as a useful resource to those interested in computational sciences. At present, only information that may be di

  13. NATIVE AMERICAN www.nas.pdx.edu

    E-print Network

    NATIVE AMERICAN STUDIES www.nas.pdx.edu PSU's Native American Studies (NAS) Program is program was inaugurated in 2004 and presently offers a Minor in Native American Studies. NAS is an interdisciplinary constituencies: Students who have a serious academic interest in Native Americans and who wish to combine

  14. Trazabilidad y Unificación de las escalas de Dureza en México

    Microsoft Academic Search

    Alfredo Esparza Ramírez

    Resumen. Las mediciones de dureza desempeñan un papel importante en la determinación de las características mecánicas de un material y, es frecuente que estos resultados se tomen como base para la aceptación o rechazo de piezas terminadas. Ante la diversidad de métodos, escalas, penetradores, fuerzas aplicadas y tiempos de prueba no se tiene una definición completa en la magnitud de

  15. NAS Panel faults export controls

    NASA Astrophysics Data System (ADS)

    Katzoff, Judith A.

    A study prepared by a top-level panel says that current export controls on militarily sensitive U.S. technology may be “overcorrecting” previous weaknesses in that system, resulting in “a complex and confusing control system” that makes it more difficult for U.S. businesses to compete in international markets. Moreover, this control system has “an increasingly corrosive effect” on U.S. relations with allies. The panel recommended that the United States concentrate more effort on bringing about uniformity in the export control policies of countries belonging to the Coordinating Committee on Multilateral Export Controls (CoCom), i.e., most of the member nations in NATO (the North Atlantic Treaty Organization) and Japan.The 21-member panel was appointed by the Committee on Science, Engineering, and Public Policy (COSEPUP), a joint unit of the National Academy of Sciences (NAS), the National Academy of Engineering (NAE), and the Institute of Medicine (IOM). The panel, composed of administrators, researchers, and former government officials, was chaired by AGU member Lew Allen, Jr., director of the Jet Propulsion Laboratory (Pasadena, Calif.) and former chief of staff of the U.S. Air Force. Their report was supported by NAS funds, by a number of private organizations (including AGU), by the U.S. Departments of Commerce, Defense, Energy, and State, by the National Science Foundation, and by the National Aeronautics and Space Administration.

  16. Supercomputing 2002: NAS Demo Abstracts

    NASA Technical Reports Server (NTRS)

    Parks, John (Technical Monitor)

    2002-01-01

    The hyperwall is a new concept in visual supercomputing, conceived and developed by the NAS Exploratory Computing Group. The hyperwall will allow simultaneous and coordinated visualization and interaction of an array of processes, such as a the computations of a parameter study or the parallel evolutions of a genetic algorithm population. Making over 65 million pixels available to the user, the hyperwall will enable and elicit qualitatively new ways of leveraging computers to accomplish science. It is currently still unclear whether we will be able to transport the hyperwall to SC02. The crucial display frame still has not been completed by the metal fabrication shop, although they promised an August delivery. Also, we are still working the fragile node issue, which may require transplantation of the compute nodes from the present 2U cases into 3U cases. This modification will increase the present 3-rack configuration to 5 racks.

  17. Mapa Geologico de Venezuela a Escala 1:750,000

    USGS Publications Warehouse

    Hackley, Paul C.; Urbani, Franco; Karlsen, Alex W.; Garrity, Christopher P.

    2006-01-01

    Se presenta un mapa geologico digital de Venezuela sobre un fondo de relieve sombreado. Los datos geologicos e hidrologicos del norte del rio Orinoco proceden de la digitalizacion de mapas geologicos en papel a escala 1:500.000. Estos datos fueron integrados con el mapa geologico digital del Escudo de Guayana Venezolano, a su vez derivado de hojas en papel a escala 1:500.000. La informacion sobre los tipos de fallas mostrados en el mapa es igual que en las fuentes originales. Los poligonos geologicos fueron atribuidos por edad, litologia y nombre de la unidad siguiendo el Codigo geologico de Venezuela. Se incorporaron revisiones significativas de la geologia de la Cordillera de la Costa a partir de las nuevas hojas integradas a escala 1:25.000. Toda esta informacion geologico-estructural se sobrepuso a una imagen de relieve sombreado, producida por el procesamiento de los datos de radar interferometrico con 90 m (3 arcosegundos) de resolucion espacial obtenidos por la mision topografica de radar del transbordador espacial (SRTM). Las areas de la base de datos del SRTM carentes de informacion fueron llenadas por medio de la interpolacion de los datos de las celdas adyacentes. Para producir la imagen de relieve sombreado se uso una direccion de iluminacion de 315 deg con un angulo de 65 deg sobre el horizonte. La proyeccion usada en el mapa es conica equidistante, con latitudes de 4 y 9 deg norte como paralelos estandar y una longitud de 66 deg al oeste como meridiano central. Los datos en el mapa proceden primordialment de hojas a escala 1:500.000 y el producto esta preparado para una impresion optima en escala 1:750.000. Los usuarios pueden obtener ampliaciones mayores, sin embargo no se garantiza la precision del mapa a escalas mas detalladas. Especialmente en la region de Guayana, al sobreponer los mapas geologicos sobre la reciente imagen SRTM, se notan grandes discrepancias no sistematicas tanto en contactos como en fallas. Esto es debido a que los mapas geologicos de Guayana tienen como base topografica las imagenes de radar de vision lateral (SLAR), con muy control de campo de los a?os 1970's. La correccion de estos desfases esta planificada para el futuro.

  18. Communication Characteristics in the NAS Parallel Benchmarks

    E-print Network

    Yuan, Xin

    Communication Characteristics in the NAS Parallel Benchmarks Ahmad Faraj Xin Yuan Department-- In this paper, we investigate the communication characteris- tics of the Message Passing Interface (MPI) implementation of the NAS parallel benchmarks and study the effectiveness of com- piled communication for MPI

  19. GaInNAs laser gain

    SciTech Connect

    CHOW,WENG W.; JONES,ERIC D.; MODINE,NORMAND A.; KURTZ,STEVEN R.; ALLERMAN,ANDREW A.

    2000-05-23

    The optical gain spectra for GaInNAs/GaAs quantum wells are computed using a microscopic laser theory. From these spectra, the peak gain and carrier radiative decay rate as functions of carrier density are determined. These dependences allow the study of the lasing threshold current density of GaInNAs/GaAs quantum well structures.

  20. NASA Advanced Supercomputing (NAS) User Services Group

    NASA Technical Reports Server (NTRS)

    Pandori, John; Hamilton, Chris; Niggley, C. E.; Parks, John W. (Technical Monitor)

    2002-01-01

    This viewgraph presentation provides an overview of NAS (NASA Advanced Supercomputing), its goals, and its mainframe computer assets. Also covered are its functions, including systems monitoring and technical support.

  1. Métodos de reducción de escala: aplicaciones al tiempo, clima, variabilidad climática y cambio climático

    Microsoft Academic Search

    Jorge A. Amador; Eric J. Alfaro

    2009-01-01

    Los Modelos de Circulación General Atmosféricos-Oceánicos Acoplados muestran buena habilidad para simular la evolución de las circulaciones de escala global. Sin embargo, esta bondad no es muy útil para el estudio de impactos locales debido a que la resolución espacial de esos modelos está por encima de la escala de los impactos locales que se desean analizar. Es importante tomar

  2. Economías de escala en agua y saneamiento: examen de la literatura

    Microsoft Academic Search

    Gustavo Ferro; Emilio J. Lentini; Augusto C. Mercadier

    2010-01-01

    Este estudio se ocupa de relevar la literatura internacional sobre economías de escala en el sector de agua y saneamiento, reseñarla y extraer hilos conductores. En todo el mundo está en discusión cómo lograr un acceso más equitativo y una prestación más eficiente. Un tema vinculado con la eficiencia es la posibilidad de aprovechar economías de escala al dimensionar la

  3. Status and projections of the NAS program

    NASA Technical Reports Server (NTRS)

    Bailey, Frank R.

    1986-01-01

    NASA's Numerical Aerodynamic Simulation (NAS) Program has completed development of the initial operating configuration of the NAS Processing System Network (NPSN). This is the first milestone in the continuing and pathfinding effort to provide state-of-the-art supercomputing for aeronautics research and development. The NPSN, available to a nation-wide community of remote users, provides a uniform UNIX environment over a network of host computers ranging from the Cray-2 supercomputer to advanced scientific workstations. This system, coupled with a vendor-independent base of common user interface and network software, presents a new paradigm for supercomputing environments. Background leading to the NAS program, its programmatic goals and strategies, technical goals and objectives, and the development activities leading to the current NPSN configuration are presented. Program status, near-term plans, and plans for the next major milestone, the extended operating configuration, are also discussed.

  4. Antimycobacterial Activity and Mechanism of Action of NAS-91.

    PubMed

    Gratraud, Paul; Surolia, Namita; Besra, Gurdyal S; Surolia, Avadhesha; Kremer, Laurent

    2008-03-01

    The antimalarial agents NAS-91 and NAS-21 were found to express potent antimycobacterial activity, NAS-91 being more active than NAS-21. They partially inhibited mycolic acid biosynthesis and profoundly altered oleic acid production. The development of a cell-free assay for Delta 9-desaturase activity allowed direct demonstration of the inhibition of oleic acid biosynthesis by these compounds. PMID:18086849

  5. Security Controls Hurt Research, NAS Warns.

    ERIC Educational Resources Information Center

    Kolata, Gina

    1982-01-01

    A National Academy of Sciences (NAS) report found no evidence that leaks of technical information from universities or other research centers have damaged national security. However, in areas where control is warranted, decisions should be based on criteria. These criteria and issues related to security control and technological transfer are…

  6. Optical Gain in GaInNAs and GaInNAsSb Quantum Wells

    Microsoft Academic Search

    James W. Ferguson; Peter Blood; Peter M. Smowton; Hopil Bae; Tomas Sarmiento; James S. Harris; Nelson Tansu; Luke J. Mawst

    2011-01-01

    We have measured the absorption, gain and spon- taneous emission spectra of GaInNAsSb (3.3%N), GaInNAs (0.5%N) and GaInAs quantum well structures to compare their merits as laser gain media. The parameters describing the rela- tions between peak gain and current provide only limited insight. From the analysis of absorption spectra we have determined the intrinsic properties of the structures, represented

  7. NAS Panel endorses science center concept

    NASA Astrophysics Data System (ADS)

    Science and technology centers, as proposed by President Ronald Reagan in his January 1987 State of the Union message, could make “significant contributions to science and to the nation's economic competitiveness,” according to a new report by a National Academy of Sciences (NAS) panel. What will be necessary to realize these contributions, the panel cautioned, are proper management, adequate resources, and, “above all, the selection of programs for which the centers are the most effective form of organization.”NSF plans to support science and technology centers, beginning October 1, 1988, which is the start of fiscal year 1988. NSF requested guidance from the NAS panel in implementing the program. Although other government agencies will participate in the program, NSF will play the primary role.

  8. NAS Parallel Benchmarks Results 3-95

    NASA Technical Reports Server (NTRS)

    Saini, Subhash; Bailey, David H.; Walter, Howard (Technical Monitor)

    1995-01-01

    The NAS Parallel Benchmarks (NPB) were developed in 1991 at NASA Ames Research Center to study the performance of parallel supercomputers. The eight benchmark problems are specified in a "pencil and paper" fashion, i.e., the complete details of the problem are given in a NAS technical document. Except for a few restrictions, benchmark implementors are free to select the language constructs and implementation techniques best suited for a particular system. In this paper, we present new NPB performance results for the following systems: (a) Parallel-Vector Processors: CRAY C90, CRAY T90 and Fujitsu VPP500; (b) Highly Parallel Processors: CRAY T3D, IBM SP2-WN (Wide Nodes), and IBM SP2-TN2 (Thin Nodes 2); and (c) Symmetric Multiprocessors: Convex Exemplar SPPIOOO, CRAY J90, DEC Alpha Server 8400 5/300, and SGI Power Challenge XL (75 MHz). We also present sustained performance per dollar for Class B LU, SP and BT benchmarks. We also mention future NAS plans for the NPB.

  9. UAS Integration in the NAS Project - Project Overview

    NASA Technical Reports Server (NTRS)

    Johnson, Chuck

    2011-01-01

    The goal of the UAS integration in the NAS Project is to contribute capabili1es that reduce technical barriers related to the safety and opera1onal challenges associated with enabling routine UAS access to the NAS.

  10. Carrier spin relaxation in GaInNAsSb/GaNAsSb/GaAs quantum well

    SciTech Connect

    Asami, T.; Nosho, H.; Tackeuchi, A. [Department of Applied Physics, Waseda University, Shinjuku, Tokyo 169-8555 (Japan); Li, L. H.; Harmand, J. C. [Laboratory for Photonics and Nanostructures-CNRS, Site Alcatel de Marcoussis, Route de Nozay, 91460 Marcoussis (France); Lu, S. L. [Suzhou Institute of Nano-tech and Nano-bionics, CAS, Dushu, Lake Higher Education Town, Ruoshui Road 398, Suzhou Industrial Park, Suzhou 215125 (China)

    2011-12-23

    We have investigated the carrier spin relaxation in GaInNAsSb/GaNAsSb/GaAs quantum well (QW) by time-resolved photoluminescence (PL) measurement. The sample consists of an 8-nm-thick GaIn{sub 0.36}N{sub 0.006}AsSb{sub 0.015} well, 5-nm-thick GaN{sub 0.01}AsSb{sub 0.11} intermediate barriers and 100-nm-thick GaAs barriers grown by molecular beam epitaxy on a GaAs(100) substrate. The spin relaxation time and recombination lifetime at 10 K are measured to be 228 ps and 151 ps, respectively. As a reference, we have also obtained a spin relaxation time of 125 ps and a recombination lifetime of 63 ps for GaInNAs/GaNAs/GaAs QW. This result shows that crystal quality is slightly improved by adding Sb, although these short carrier lifetimes mainly originate from a nonradiative recombination. These spin relaxation times are longer than the 36 ps spin relaxation time of InGaAs/InP QWs and shorter than the 2 ns spin relaxation time of GaInNAs/GaAs QW.

  11. DOE Radiation Research Program is floundering - NAS

    SciTech Connect

    Lobsenz, G.

    1994-04-20

    The Energy Department's radiation health effects research program is floundering in a morass of administrative confusion due to an ill-considered 1990 joint management agreement between DOE and the Health and Human Services Department, a National Academy of Sciences panel says. The NAS panel said the [open quotes]administrative difficulties[close quotes] created by the DOE-HHS agreement appear to be [open quotes]stifling creativity and efficiency within DOE's Epidemiology Research Program, delaying the completion and publication of research.[close quotes] The panel also expressed concern that DOE has failed to adequately fund or staff its health research office, and that the department had no master research plan to identify research needs or set forth uniform, scientifically rigorous data collection procedures. The panel said DOE's lack of commitment was particularly evident in its failure to set up an effective health surveillance program for its nuclear work force. In addition, the panel said DOE had fallen short on promises to create a comprehensive computer bank of health research data that would be continually updated with new information gleaned from an ongoing worker surveillance program. While recommending enhancements, the NAS panel emphasized that DOE's health research program would not be able to function effectively until the department revamped its joint management agreement with HHS.

  12. Dynamics of time-resolved photoluminescence in GaInNAs and GaNAsSb solar cells

    PubMed Central

    2014-01-01

    We report a time-resolved photoluminescence study for GaInNAs and GaNAsSb p-i-n bulk solar cells grown on GaAs(100). In particular, we studied the extent to which the carrier lifetime decreases with the increase of N content. Rapid thermal annealing proved to significantly increase the decay times by a factor of 10 to 12 times, for both GaInNAs and GaNAsSb heterostructures, while for the 1-eV bandgap GaNAsSb structure, grown at the same growth conditions as the GaInNAs, the photoluminescence decay time remained slightly below 100 ps after annealing; the approximately 1.15-eV GaInNAs p-i-n solar cell exhibited a lifetime as long as 900 ps. PACS 78.47.D; 78.55.Cr; 88.40.hj PMID:24533702

  13. NAS Parallel Benchmarks, Multi-Zone Versions

    NASA Technical Reports Server (NTRS)

    vanderWijngaart, Rob F.; Haopiang, Jin

    2003-01-01

    We describe an extension of the NAS Parallel Benchmarks (NPB) suite that involves solving the application benchmarks LU, BT and SP on collections of loosely coupled discretization meshes. The solutions on the meshes are updated independently, but after each time step they exchange boundary value information. This strategy, which is common among structured-mesh production flow solver codes in use at NASA Ames and elsewhere, provides relatively easily exploitable coarse-grain parallelism between meshes. Since the individual application benchmarks also allow fine-grain parallelism themselves, this NPB extension, named NPB Multi-Zone (NPB-MZ), is a good candidate for testing hybrid and multi-level parallelization tools and strategies.

  14. Remote access for NAS: Supercomputing in a university environment

    NASA Technical Reports Server (NTRS)

    Johnson, G.; Olson, B.; Swisshelm, J.; Pryor, D.; Ziebarth, J.

    1986-01-01

    The experiment was designed to assist the Numerical Aerodynamic Simulation (NAS) Project Office in the testing and evaluation of long haul communications for remote users. The objectives of this work were to: (1) use foreign workstations to remotely access the NAS system; (2) provide NAS with a link to a large university-based computing facility which can serve as a model for a regional node of the Long-Haul Communications Subsystem (LHCS); and (3) provide a tail circuit to the University of Colorado a Boulder thereby simulating the complete communications path from NAS through a regional node to an end-user.

  15. Factor Structure of the "Escala de Autoeficacia para la Depresion en Adolescentes" (EADA)

    ERIC Educational Resources Information Center

    Diaz-Santos, Mirella; Cumba-Aviles, Eduardo; Bernal, Guillermo; Rivera-Medina, Carmen

    2011-01-01

    The current concept and measures of self-efficacy for depression in adolescents do not consider developmental and cultural aspects essential to understand and assess this construct in Latino youth. We examined the factor structure of the "Escala de Autoeficacia para la Depresion en Adolescentes" (EADA), a Spanish instrument designed to assess this…

  16. Experimental studies on atmospheric Stirling engine NAS2

    Microsoft Academic Search

    H. Watanabe; N. Isshiki; M. Ohtomo

    1996-01-01

    Atmospheric hot air Stirling engines NAS-1 and 2 have a simple flat rubber sheet diaphragm as their power piston, and have been experimentally studied at Nihon University, Japan, for several years continuously, with the target of obtaining more than 100 watts shaft power by atmospheric air with simple construction and cheap materials. The first NAS-1 was intended to be a

  17. Data communication requirements for the advanced NAS network

    Microsoft Academic Search

    Eugene Levin; C. K. Eaton; Bruce Young

    1986-01-01

    The goal of the Numerical Aerodynamic Simulation (NAS) Program is to provide a powerful computational environment for advanced research and development in aeronautics and related disciplines. The present NAS system consists of a Cray 2 supercomputer connected by a data network to a large mass storage system, to sophisticated local graphics workstations, and by remote communications to researchers throughout the

  18. NAS Grid Benchmarks: A Tool for Grid Space Exploration

    Microsoft Academic Search

    Michael A. Frumkin; Rob F. Van Der Wijngaart

    2001-01-01

    We present a benchmark suite for computational grids in this paper. It is based on the NAS Parallel Benchmarks (NPB) and is called the NAS Grid Benchmark (NGB). We present NGB as a data flow graph encapsulating an instance of an NPB code in each graph node, which communicates with other nodes by sending\\/receiving initialization data. These nodes may be

  19. An Implementation Plan for NFS at NASA's NAS Facility

    NASA Technical Reports Server (NTRS)

    Lam, Terance L.; Kutler, Paul (Technical Monitor)

    1998-01-01

    This document discusses how NASA's NAS can benefit from the Sun Microsystems' Network File System (NFS). A case study is presented to demonstrate the effects of NFS on the NAS supercomputing environment. Potential problems are addressed and an implementation strategy is proposed.

  20. The Need for Vendor Source Code at NAS. Revised

    NASA Technical Reports Server (NTRS)

    Carter, Russell; Acheson, Steve; Blaylock, Bruce; Brock, David; Cardo, Nick; Ciotti, Bob; Poston, Alan; Wong, Parkson; Chancellor, Marisa K. (Technical Monitor)

    1997-01-01

    The Numerical Aerodynamic Simulation (NAS) Facility has a long standing practice of maintaining buildable source code for installed hardware. There are two reasons for this: NAS's designated pathfinding role, and the need to maintain a smoothly running operational capacity given the widely diversified nature of the vendor installations. NAS has a need to maintain support capabilities when vendors are not able; diagnose and remedy hardware or software problems where applicable; and to support ongoing system software development activities whether or not the relevant vendors feel support is justified. This note provides an informal history of these activities at NAS, and brings together the general principles that drive the requirement that systems integrated into the NAS environment run binaries built from source code, onsite.

  1. NAS Systems Division at NASA Ames Research Center

    NSDL National Science Digital Library

    The NASA Advanced Supercomputing (NAS) division is part of the Ames Research Center Information Sciences and Technology Directorate. The NAS home page describes "leading-edge high performance computing and its role in many of NASA's critical missions for the 21st century." The site provides news and feature stories of NAS projects, but most of the site's information is in the Research & Technology section. There, you will find descriptions of many research areas and their corresponding papers and reports. Several software packages are available for download; however, some are restricted. Sample datasets of research simulation results are also offered for scientific use.

  2. Estudo de não gaussianidade nas anisotropias da RCF medidas Wmap

    NASA Astrophysics Data System (ADS)

    Andrade, A. P. A.; Wuensche, C. A.; Ribeiro, A. L. B.

    2003-08-01

    A investigação do campo de flutuações da Radiação Cósmica de Fundo (RCF) pode oferecer um importante teste para os modelos cosmológicos que descrevem a origem e a evolução das flutuações primordiais. De um lado, apresenta-se o modelo inflacionário que prevê um espectro de flutuações adiabáticas distribuídas segundo uma gaussiana e, de outro, os modelos de defeitos topológicos (dentre outros) que descrevem um mecanismo para a geração de flutuações de isocurvatura que obedecem a uma distribuição não gaussiana. Este trabalho tem como objetivo caracterizar traços do modelo não gaussiano de campo misto (entre flutuações adiabáticas e de isocurvatura) nos mapas do Wilkinson Microwave Anisotropy Probe (WMAP). Simulações das anisotropias da RCF no contexto de mistura indicam traços marcantes na distribuição das flutuações de temperatura, mesmo quando consideradas pequenas contribuições do campo de isocurvatura (da ordem de 0.001). O efeito da mistura entre os campos resulta na transferência de potência de flutuações em escalas angulares intermediárias para flutuações em pequenas escalas angulares. Este efeito pode ser caracterizado pela relação entre as amplitudes dos primeiros picos acústicos no espectro de potência da RCF. Neste trabalho, investigamos a contribuição do campo de isocurvatura, no contexto de mistura, sobre as observações recentes da RCF realizadas pelo WMAP. As previsões do modelo de campo misto, uma vez confrontadas com as observações em pequenas escalas angulares, podem ajudar a revelar a natureza das flutuações primordiais.

  3. UAS Integration in the NAS Project - FY 14 Annual Review

    NASA Technical Reports Server (NTRS)

    Grindle, Laurie; Randall, Debra; Hackenberg, Davis

    2014-01-01

    This briefing gives insight into the research activities and efforts being executed in order to integrate unmanned aircraft systems into the national airspace system. This briefing is to inform others of the UAS-NAS Projects progress and future directions.

  4. New light on the twelve Nid?nas

    Microsoft Academic Search

    Dhivan Thomas Jones

    2009-01-01

    Paicca samupp?da (dependent arising) is the central philosophical principle of Buddhism, and is most commonly exemplified in the suttas in terms of the twelve nid?nas. The ubiquitous interpretation of the twelve nid?nas of paicca samupp?da as taking place over three lives, a religious doctrine explaining the rebirth process, is a commentarial development, not found in the suttas. Recent Therav?din exegetes

  5. Experimental studies on atmospheric Stirling engine NAS-2

    SciTech Connect

    Watanabe, Hiroichi [Nihon Univ., Koriyama (Japan). Dept. of Mechanical Engineering; Isshiki, Naotsugu [Nihon Univ., Tokyo (Japan); Ohtomo, Michihiro [Tohoku Electric Power Co., Inc., Sendai (Japan)

    1996-12-31

    Atmospheric hot air Stirling engine NAS-1 and 2 have a simple flat rubber sheet diaphragm as their power piston, and they have been experimentally studied at Nihon University for several years continuously, with the target of to get more than 100 watts shaft power by atmospheric air with simple construction and cheap material. The first NAS-1 was intended to be a solar heated engine using television glass and wood for cheap cost, but it failed by thermal break of glass, so the improved NAS-2 is changed to be heated by gas burner, using metallic materials in all parts except rubber power piston. Other than this rubber sheet diaphragm, NAS-2 has many features as using James Watt crank mechanism, high finny copper tube for conventional commercial heat exchanger, and two kinds of hot gas heaters, etc. About the rubber sheet for the power piston, the thickness of the sheet was changed from 2 mm to 6 mm gradually to known what thickness is best, and it is found that about 5 mm is best for this engine. After trying many improvements on this engine, NAS-2 has produced about 130 watt shaft power with indicated power of 350 watt at 1994. In this paper detail of many features, history, results and experiments of these NAS engines are reported.

  6. Natural attenuation software (NAS): Assessing remedial strategies and estimating timeframes

    USGS Publications Warehouse

    Mendez, E.; Widdowson, M.; Chapelle, F.; Casey, C.

    2005-01-01

    Natural Attenuation Software (NAS) is a screening tool to estimate remediation timeframes for monitored natural attenuation (MNA) and to assist in decision-making on the level of source zone treatment in conjunction with MNA using site-specific remediation objectives. Natural attenuation processes that NAS models include are advection, dispersion, sorption, non-aqueous phase liquid (NAPL) dissolution, and biodegradation of either petroleum hydrocarbons or chlorinated ethylenes. Newly-implemented enhancements to NAS designed to maximize the utility of NAS for site managers were observed. NAS has expanded source contaminant specification options to include chlorinated ethanes and chlorinated methanes, and to allow for the analysis of any other user-defined contaminants that may be subject to microbially-mediated transformations (heavy metals, radioisotopes, etc.). Included is the capability to model co-mingled plumes, with constituents from multiple contaminant categories. To enable comparison of remediation timeframe estimates between MNA and specific engineered remedial actions , NAS was modified to incorporate an estimation technique for timeframes associated with pump-and-treat remediation technology for comparison to MNA. This is an abstract of a paper presented at the 8th International In Situ and On-Site Bioremediation Symposium (Baltimore, MD 6/6-9/2005).

  7. NAS - Supercomputing master tool for aeronautics. [Numerical Aerodynamic Simulation

    NASA Technical Reports Server (NTRS)

    Bailey, F. R.

    1985-01-01

    Features, performance objectives and applications planned for the NASA National Aerodynamics Simulator (NAS) are outlined. NAS was conceived in the 1970s as a means to performing numerical aerodynamic simulations beyond the scope of wind tunnel testing for high-speed flight. Present supercomputers cannot deal with problems exhibiting strongly coupled viscous effects, which are being increasingly more accurately represented by approximations to the full Navier-Stokes equations. Located at the NASA-Ames Center, the NAS will by 1990 comprise a distributed computer network capable of a 4 Gflop computing rate and have a memory capacity of 1 billion 64-bit words. Remote access to the system through UNIX-based microcomputers will be available through land lines and satellite links. New supercomputers will be tested on the system without disturbing ongoing work. The core machine will be a Cray-2 with a 2 Gflop rate.

  8. Validation of a Spanish version of the Muscle Appearance Satisfaction Scale: escala de satisfacción muscular.

    PubMed

    González-Martí, Irene; Bustos, Juan Gregorio Fernández; Jordán, Onofre Ricardo Contreras; Mayville, Stephen B

    2012-09-01

    The psychometric properties of a Spanish version of the muscle appearance satisfaction scale (MASS; Mayville, Williamson, White, Netemeyer, & Drab, 2002) were examined using a sample of five hundred and sixty-one male weightlifters. Exploratory and confirmatory factor analyses suggested that the 19-item Spanish version of the MASS called the Escala de Satisfacción Muscular (ESM), was represented by five subscales similar to the original MASS. Internal consistency of the measure was good (? = .86-.95), and various measures of construct validity indicated that the ESM may be a useful measure of Muscle Dysmorphia symptoms among Spanish speaking populations. PMID:22682995

  9. Upgrades to the Probabilistic NAS Platform Air Traffic Simulation Software

    NASA Technical Reports Server (NTRS)

    Hunter, George; Boisvert, Benjamin

    2013-01-01

    This document is the final report for the project entitled "Upgrades to the Probabilistic NAS Platform Air Traffic Simulation Software." This report consists of 17 sections which document the results of the several subtasks of this effort. The Probabilistic NAS Platform (PNP) is an air operations simulation platform developed and maintained by the Saab Sensis Corporation. The improvements made to the PNP simulation include the following: an airborne distributed separation assurance capability, a required time of arrival assignment and conformance capability, and a tactical and strategic weather avoidance capability.

  10. Hydrogen and carbon incorporation in GaInNAs

    NASA Astrophysics Data System (ADS)

    Moto, A.; Takahashi, M.; Takagishi, S.

    2000-12-01

    We have investigated the dependence of impurity incorporation of GaInNAs on the In concentration, substrate orientation, and growth temperature by secondary ion mass spectroscopy (SIMS). GaInNAs films were grown by low-pressure metalorganic vapor-phase epitaxy (MOVPE) on GaAs substrates. It was found that H and C concentrations were strongly related to the N concentration in the solid and the dimethylhydrazine (DMHy) flux at the surface. Furthermore, intentional Si-doping study revealed that incorporated H was stable, which is most likely a consequence of neutral bonding N, although the activation energy of H was as large as 197 kcal/mol derived from the observed growth-temperature dependence.

  11. Effect of Substrate Orientation on Photoluminescence of GaNAs

    NASA Astrophysics Data System (ADS)

    Moto, Akihiro; Takahashi, Mitsuo; Takagishi, Shigenori

    2000-12-01

    The effect of substrate orientation on photoluminescence (PL) properties has been explored for GaNAs grown by metalorganic vapor phase epitaxy using dimethylhydrazine as a nitrogen precursor. The PL spectra show improvements in the emission intensity and linewidth, and a decrease in a deep level emission, with the surface tilted from (100) to (411)A towards (111)A@. For the peak position dependence on excitation intensity, a blueshift revealed by the increased excitation intensity is also depressed with higher-index substrates. These improvements could be obtained as a consequence of reductions in deep level defects, residual impurity incorporations, and spatial fluctuations in nitrogen concentration, with an increase in the A-type step density. In addition to the improved optical quality, (411)A shows a relatively large redshift in bandgap. Our results indicate that the use of high-index substrates is effective in GaNAs applications.

  12. NAS Grid Benchmarks: A Tool for Grid Space Exploration

    NASA Technical Reports Server (NTRS)

    Frumkin, Michael; VanderWijngaart, Rob F.; Biegel, Bryan (Technical Monitor)

    2001-01-01

    We present an approach for benchmarking services provided by computational Grids. It is based on the NAS Parallel Benchmarks (NPB) and is called NAS Grid Benchmark (NGB) in this paper. We present NGB as a data flow graph encapsulating an instance of an NPB code in each graph node, which communicates with other nodes by sending/receiving initialization data. These nodes may be mapped to the same or different Grid machines. Like NPB, NGB will specify several different classes (problem sizes). NGB also specifies the generic Grid services sufficient for running the bench-mark. The implementor has the freedom to choose any specific Grid environment. However, we describe a reference implementation in Java, and present some scenarios for using NGB.

  13. Evaluating the Information Power Grid using the NAS Grid Benchmarks

    NASA Technical Reports Server (NTRS)

    VanderWijngaartm Rob F.; Frumkin, Michael A.

    2004-01-01

    The NAS Grid Benchmarks (NGB) are a collection of synthetic distributed applications designed to rate the performance and functionality of computational grids. We compare several implementations of the NGB to determine programmability and efficiency of NASA's Information Power Grid (IPG), whose services are mostly based on the Globus Toolkit. We report on the overheads involved in porting existing NGB reference implementations to the IPG. No changes were made to the component tasks of the NGB can still be improved.

  14. Hybrid Network Architectures for the Next Generation NAS

    NASA Technical Reports Server (NTRS)

    Madubata, Christian

    2003-01-01

    To meet the needs of the 21st Century NAS, an integrated, network-centric infrastructure is essential that is characterized by secure, high bandwidth, digital communication systems that support precision navigation capable of reducing position errors for all aircraft to within a few meters. This system will also require precision surveillance systems capable of accurately locating all aircraft, and automatically detecting any deviations from an approved path within seconds and be able to deliver high resolution weather forecasts - critical to create 4- dimensional (space and time) profiles for up to 6 hours for all atmospheric conditions affecting aviation, including wake vortices. The 21st Century NAS will be characterized by highly accurate digital data bases depicting terrain, obstacle, and airport information no matter what visibility conditions exist. This research task will be to perform a high-level requirements analysis of the applications, information and services required by the next generation National Airspace System. The investigation and analysis is expected to lead to the development and design of several national network-centric communications architectures that would be capable of supporting the Next Generation NAS.

  15. Autotasked Performance in the NAS Workload: A Statistical Analysis

    NASA Technical Reports Server (NTRS)

    Carter, R. L.; Stockdale, I. E.; Kutler, Paul (Technical Monitor)

    1998-01-01

    A statistical analysis of the workload performance of a production quality FORTRAN code for five different Cray Y-MP hardware and system software configurations is performed. The analysis was based on an experimental procedure that was designed to minimize correlations between the number of requested CPUs and the time of day the runs were initiated. Observed autotasking over heads were significantly larger for the set of jobs that requested the maximum number of CPUs. Speedups for UNICOS 6 releases show consistent wall clock speedups in the workload of around 2. which is quite good. The observed speed ups were very similar for the set of jobs that requested 8 CPUs and the set that requested 4 CPUs. The original NAS algorithm for determining charges to the user discourages autotasking in the workload. A new charging algorithm to be applied to jobs run in the NQS multitasking queues also discourages NAS users from using auto tasking. The new algorithm favors jobs requesting 8 CPUs over those that request less, although the jobs requesting 8 CPUs experienced significantly higher over head and presumably degraded system throughput. A charging algorithm is presented that has the following desirable characteristics when applied to the data: higher overhead jobs requesting 8 CPUs are penalized when compared to moderate overhead jobs requesting 4 CPUs, thereby providing a charging incentive to NAS users to use autotasking in a manner that provides them with significantly improved turnaround while also maintaining system throughput.

  16. Análisis factorial exploratorio y propiedades psicométricas de la Escala de Creencias y Actitudes hacia la hipnosis-cliente

    Microsoft Academic Search

    Antonio Capafons; Ana Alarcón; Sonia Cabañas; Begoña Espejo

    Las actitudes inadecuadas y las creencias erróneas hacia la hipnosis influyen en las respuestas a las su- gestiones hipnóticas. Especialmente afectan al resultado que se obtiene en intervenciones que adjun- ten hipnosis. La escala evalúa las creencias erróneas más frecuentes hacia la hipnosis y las actitudes negativas derivadas de ellas. Los análisis factoriales exploratorios (N= 761), han generado seis facto-

  17. NAS Applications and Advanced Architectures David H. Bailey, Rupak Biswas and Rob Van Der Wijngaart

    E-print Network

    Bailey, David H.

    Solutions. This work was performed under contract NAS2-14303. Van Der Wijngaart: NASA Ames Research Center of MRJ. This work was performed under contract NAS2-14303. 1 #12;1. Introduction The usefulness

  18. Nas redes sociais, a influncia de cada um vai muito alm do que se pensava

    E-print Network

    Instituto de Sistemas e Robotica

    Nas redes sociais, a influência de cada um vai muito além do que se pensava Uma equipa de cientistas portugueses mostrou que, nas redes online como o Facebook ou o Twitter, a influência das opiniões Tóquio, as opiniões que estamos constantemente a proclamar perante os nossos amigos nas redes sociais

  19. NAS Requirements Checklist for Job Queuing/Scheduling Software

    NASA Technical Reports Server (NTRS)

    Jones, James Patton

    1996-01-01

    The increasing reliability of parallel systems and clusters of computers has resulted in these systems becoming more attractive for true production workloads. Today, the primary obstacle to production use of clusters of computers is the lack of a functional and robust Job Management System for parallel applications. This document provides a checklist of NAS requirements for job queuing and scheduling in order to make most efficient use of parallel systems and clusters for parallel applications. Future requirements are also identified to assist software vendors with design planning.

  20. Navigation in Grid Space with the NAS Grid Benchmarks

    NASA Technical Reports Server (NTRS)

    Frumkin, Michael; Hood, Robert; Biegel, Bryan A. (Technical Monitor)

    2002-01-01

    We present a navigational tool for computational grids. The navigational process is based on measuring the grid characteristics with the NAS Grid Benchmarks (NGB) and using the measurements to assign tasks of a grid application to the grid machines. The tool allows the user to explore the grid space and to navigate the execution at a grid application to minimize its turnaround time. We introduce the notion of gridscape as a user view of the grid and show how it can be me assured by NGB, Then we demonstrate how the gridscape can be used with two different schedulers to navigate a grid application through a rudimentary grid.

  1. Data communication requirements for the advanced NAS network

    NASA Technical Reports Server (NTRS)

    Levin, Eugene; Eaton, C. K.; Young, Bruce

    1986-01-01

    The goal of the Numerical Aerodynamic Simulation (NAS) Program is to provide a powerful computational environment for advanced research and development in aeronautics and related disciplines. The present NAS system consists of a Cray 2 supercomputer connected by a data network to a large mass storage system, to sophisticated local graphics workstations, and by remote communications to researchers throughout the United States. The program plan is to continue acquiring the most powerful supercomputers as they become available. In the 1987/1988 time period it is anticipated that a computer with 4 times the processing speed of a Cray 2 will be obtained and by 1990 an additional supercomputer with 16 times the speed of the Cray 2. The implications of this 20-fold increase in processing power on the data communications requirements are described. The analysis was based on models of the projected workload and system architecture. The results are presented together with the estimates of their sensitivity to assumptions inherent in the models.

  2. Concepts of Integration for UAS Operations in the NAS

    NASA Technical Reports Server (NTRS)

    Consiglio, Maria C.; Chamberlain, James P.; Munoz, Cesar A.; Hoffler, Keith D.

    2012-01-01

    One of the major challenges facing the integration of Unmanned Aircraft Systems (UAS) in the National Airspace System (NAS) is the lack of an onboard pilot that can comply with the legal requirement identified in the US Code of Federal Regulations (CFR) that pilots see and avoid other aircraft. UAS will be expected to demonstrate the means to perform the function of see and avoid while preserving the safety level of the airspace and the efficiency of the air traffic system. This paper introduces a Sense and Avoid (SAA) concept for integration of UAS into the NAS that is currently being developed by the National Aeronautics and Space Administration (NASA) and identifies areas that require additional experimental evaluation to further inform various elements of the concept. The concept design rests on interoperability principles that take into account both the Air Traffic Control (ATC) environment as well as existing systems such as the Traffic Alert and Collision Avoidance System (TCAS). Specifically, the concept addresses the determination of well clear values that are large enough to avoid issuance of TCAS corrective Resolution Advisories, undue concern by pilots of proximate aircraft and issuance of controller traffic alerts. The concept also addresses appropriate declaration times for projected losses of well clear conditions and maneuvers to regain well clear separation.

  3. Statistical Analysis of NAS Parallel Benchmarks and LINPACK Results

    NASA Technical Reports Server (NTRS)

    Meuer, Hans-Werner; Simon, Horst D.; Strohmeier, Erich; Lasinski, T. A. (Technical Monitor)

    1994-01-01

    In the last three years extensive performance data have been reported for parallel machines both based on the NAS Parallel Benchmarks, and on LINPACK. In this study we have used the reported benchmark results and performed a number of statistical experiments using factor, cluster, and regression analyses. In addition to the performance results of LINPACK and the eight NAS parallel benchmarks, we have also included peak performance of the machine, and the LINPACK n and n(sub 1/2) values. Some of the results and observations can be summarized as follows: 1) All benchmarks are strongly correlated with peak performance. 2) LINPACK and EP have each a unique signature. 3) The remaining NPB can grouped into three groups as follows: (CG and IS), (LU and SP), and (MG, FT, and BT). Hence three (or four with EP) benchmarks are sufficient to characterize the overall NPB performance. Our poster presentation will follow a standard poster format, and will present the data of our statistical analysis in detail.

  4. High electron mobility in Ga(In)NAs films grown by molecular beam epitaxy

    SciTech Connect

    Miyashita, Naoya; Ahsan, Nazmul; Monirul Islam, Muhammad; Okada, Yoshitaka [Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan); Inagaki, Makoto [Toyota Technological Institute, 2-12-1 Hisakata, Tempaku-ku, Nagoya 468-8511, Aichi (Japan); Yamaguchi, Masafumi [Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan); Toyota Technological Institute, 2-12-1 Hisakata, Tempaku-ku, Nagoya 468-8511, Aichi (Japan)

    2012-11-26

    We report the highest mobility values above 2000 cm{sup 2}/Vs in Si doped GaNAs film grown by molecular beam epitaxy. To understand the feature of the origin which limits the electron mobility in GaNAs, temperature dependences of mobility were measured for high mobility GaNAs and referential low mobility GaInNAs. Temperature dependent mobility for high mobility GaNAs is similar to the GaAs case, while that for low mobility GaInNAs shows large decrease in lower temperature region. The electron mobility of high quality GaNAs can be explained by intrinsic limiting factor of random alloy scattering and extrinsic factor of ionized impurity scattering.

  5. Una aplicación de la escala de fobia a los alimentos nuevos. El caso de los alimentos étnicos

    Microsoft Academic Search

    Dena M. Camarena; Ana I. Sanjuán

    RESUMEN: El artículo investiga las actitudes de los consumidores hacia los alimentos nuevos mediante la escala FNS (Food Neo-phobia Scale). A partir de ella se obtiene el perfil de los individuos más y menos proclives a la introducción de nuevos alimentos en sus dietas, denominados respectivamente, «neo-fíli- cos» y «neo-fóbicos». Entre estos alimentos nuevos, los étnicos o propios de un

  6. NAS Miramar Molten Carbonate Fuel Cell demonstration status

    SciTech Connect

    Scroppo, J.A.

    1996-12-31

    Part of M-C Power`s Technology Development Program, this MCFC power plant is designed to supply 250 kW of electricity to Naval Air Station (NAS) Miramar. It also cogenerates steam for the district heating system. The power plant is a fully integrated unit incorporating an advanced design fuel cell based on years of laboratory tests and a prior field test. This demonstration incorporates many innovative features, one of which is the plate type reformer which processes the natural gas fuel for use in the fuel cell. M-C Power Corp. has completed the design, fabrication, and conditioning of a 250-cell fuel cell stack, which was shipped to the site where it will be installed, tested, and evaluated as a 250 kW Proof-of-Concept MCFC Power Plant. (Originally going to Kaiser Permanente`s Sand Diego Medical Center, it was relocated to Miramar.)

  7. DyNAs: constitutional dynamic nucleic acid analogues.

    PubMed

    Sreenivasachary, Nampally; Hickman, David T; Sarazin, Dominique; Lehn, Jean-Marie

    2006-11-15

    Dynamic cationic polymers were generated in aqueous media from functionally complementary monomers bearing nucleobase groups. (1)H NMR spectroscopy was used to follow the polycondensation reaction of the nucleobase-appended dihydrazides 1 and 2 with the dialdehydes B and C. The reversibility of these polymers was established by proton NMR spectroscopy through exchange of the dihydrazide 2 with polymer 1 B. The polymers 1 B, 2 B, 1 C, and 2 C represent dynamic biopolymers of nucleic acid type, DyNAs. Electrostatic interaction of these polymers with polyanionic entities, such as polyphosphates, polynucleotides, and polyaspartic acid, was shown to take place. It induces a change in size of the dynamic polymer, as it responds by an increase in degree of polymerization to an increase of the overall anionic charge introduced, that is, to the total electrostatic interaction. PMID:16969774

  8. Remotely Operated Aircraft (ROA) Impact on the National Airspace System (NAS) Work Package: Automation Impacts of ROA's in the NAS

    NASA Technical Reports Server (NTRS)

    2005-01-01

    The purpose of this document is to analyze the impact of Remotely Operated Aircraft (ROA) operations on current and planned Air Traffic Control (ATC) automation systems in the En Route, Terminal, and Traffic Flow Management domains. The operational aspects of ROA flight, while similar, are not entirely identical to their manned counterparts and may not have been considered within the time-horizons of the automation tools. This analysis was performed to determine if flight characteristics of ROAs would be compatible with current and future NAS automation tools. Improvements to existing systems / processes are recommended that would give Air Traffic Controllers an indication that a particular aircraft is an ROA and modifications to IFR flight plan processing algorithms and / or designation of airspace where an ROA will be operating for long periods of time.

  9. Consistency of TTO-NAS inorganic carbon data with modern measurements

    Microsoft Academic Search

    Toste Tanhua; Douglas W. R. Wallace

    2005-01-01

    We compare alkalinity and total dissolved inorganic carbon (DIC) measurements made during the Transient Tracers in the Ocean, North Atlantic Study (TTO-NAS) in 1981 with modern measurements from a TTO reoccupation cruise in 2004 (M60\\/5). We find that the TTO-NAS alkalinity values are 3.6 ± 2.3 ?mol kg?1 higher than modern alkalinity data tied to Certified Reference Materials. The TTO-NAS

  10. Performance Characteristics of the Multi-Zone NAS Parallel Benchmarks

    NASA Technical Reports Server (NTRS)

    Jin, Haoqiang; VanderWijngaart, Rob F.

    2003-01-01

    We describe a new suite of computational benchmarks that models applications featuring multiple levels of parallelism. Such parallelism is often available in realistic flow computations on systems of grids, but had not previously been captured in bench-marks. The new suite, named NPB Multi-Zone, is extended from the NAS Parallel Benchmarks suite, and involves solving the application benchmarks LU, BT and SP on collections of loosely coupled discretization meshes. The solutions on the meshes are updated independently, but after each time step they exchange boundary value information. This strategy provides relatively easily exploitable coarse-grain parallelism between meshes. Three reference implementations are available: one serial, one hybrid using the Message Passing Interface (MPI) and OpenMP, and another hybrid using a shared memory multi-level programming model (SMP+OpenMP). We examine the effectiveness of hybrid parallelization paradigms in these implementations on three different parallel computers. We also use an empirical formula to investigate the performance characteristics of the multi-zone benchmarks.

  11. NAS Parallel Benchmark Results 11-96. 1.0

    NASA Technical Reports Server (NTRS)

    Bailey, David H.; Bailey, David; Chancellor, Marisa K. (Technical Monitor)

    1997-01-01

    The NAS Parallel Benchmarks have been developed at NASA Ames Research Center to study the performance of parallel supercomputers. The eight benchmark problems are specified in a "pencil and paper" fashion. In other words, the complete details of the problem to be solved are given in a technical document, and except for a few restrictions, benchmarkers are free to select the language constructs and implementation techniques best suited for a particular system. These results represent the best results that have been reported to us by the vendors for the specific 3 systems listed. In this report, we present new NPB (Version 1.0) performance results for the following systems: DEC Alpha Server 8400 5/440, Fujitsu VPP Series (VX, VPP300, and VPP700), HP/Convex Exemplar SPP2000, IBM RS/6000 SP P2SC node (120 MHz), NEC SX-4/32, SGI/CRAY T3E, SGI Origin200, and SGI Origin2000. We also report High Performance Fortran (HPF) based NPB results for IBM SP2 Wide Nodes, HP/Convex Exemplar SPP2000, and SGI/CRAY T3D. These results have been submitted by Applied Parallel Research (APR) and Portland Group Inc. (PGI). We also present sustained performance per dollar for Class B LU, SP and BT benchmarks.

  12. Performance Comparison of HPF and MPI Based NAS Parallel Benchmarks

    NASA Technical Reports Server (NTRS)

    Saini, Subhash

    1997-01-01

    Compilers supporting High Performance Form (HPF) features first appeared in late 1994 and early 1995 from Applied Parallel Research (APR), Digital Equipment Corporation, and The Portland Group (PGI). IBM introduced an HPF compiler for the IBM RS/6000 SP2 in April of 1996. Over the past two years, these implementations have shown steady improvement in terms of both features and performance. The performance of various hardware/ programming model (HPF and MPI) combinations will be compared, based on latest NAS Parallel Benchmark results, thus providing a cross-machine and cross-model comparison. Specifically, HPF based NPB results will be compared with MPI based NPB results to provide perspective on performance currently obtainable using HPF versus MPI or versus hand-tuned implementations such as those supplied by the hardware vendors. In addition, we would also present NPB, (Version 1.0) performance results for the following systems: DEC Alpha Server 8400 5/440, Fujitsu CAPP Series (VX, VPP300, and VPP700), HP/Convex Exemplar SPP2000, IBM RS/6000 SP P2SC node (120 MHz), NEC SX-4/32, SGI/CRAY T3E, and SGI Origin2000. We would also present sustained performance per dollar for Class B LU, SP and BT benchmarks.

  13. Production technology of an electrolyte for Na/S batteries

    NASA Astrophysics Data System (ADS)

    Heimke, G.; Mayer, H.; Reckziegel, A.

    1982-05-01

    The trend to develop a cheap electrochemical electric battery and the development of the Na/S system are discussed. The main element in this type of battery is the beta Al2O3 solid electrolyte. Characteristics for this material of first importance are: specific surface, density of green and of sintered material, absence of cracks, gas permeability, resistance to flexion, purity, electrical conductivity, crystal structure and dimensions. Influence of production method on all these characteristics were investigated, e.g., method of compacting powder, tunnel kiln sintering versus static chamber furnace sintering, sintering inside a container or not, and type of kiln material when sintering in a container. In the stationary chamber furnace, beta alumina ceramics were produced with a density of 3.2 g/cm3, a mechanical strength higher than 160 MPa, and an electrical conductivity of about 0.125 Ohm-1cm-1 at 300 C. The best kiln material proved to be MgO and MgAl2O3.MgO ceramics.

  14. Performance Analysis of the NAS Y-MP Workload

    NASA Technical Reports Server (NTRS)

    Bergeron, Robert J.; Kutler, Paul (Technical Monitor)

    1997-01-01

    This paper describes the performance characteristics of the computational workloads on the NAS Cray Y-MP machines, a Y-MP 832 and later a Y-MP 8128. Hardware measurements indicated that the Y-MP workload performance matured over time, ultimately sustaining an average throughput of 0.8 GFLOPS and a vector operation fraction of 87%. The measurements also revealed an operation rate exceeding 1 per clock period, a well-balanced architecture featuring a strong utilization of vector functional units, and an efficient memory organization. Introduction of the larger memory 8128 increased throughput by allowing a more efficient utilization of CPUs. Throughput also depended on the metering of the batch queues; low-idle Saturday workloads required a buffer of small jobs to prevent memory starvation of the CPU. UNICOS required about 7% of total CPU time to service the 832 workloads; this overhead decreased to 5% for the 8128 workloads. While most of the system time went to service I/O requests, efficient scheduling prevented excessive idle due to I/O wait. System measurements disclosed no obvious bottlenecks in the response of the machine and UNICOS to the workloads. In most cases, Cray-provided software tools were- quite sufficient for measuring the performance of both the machine and operating, system.

  15. The NAS and The Histopathologic Diagnosis in NAFLD: Distinct Clinicopathologic Meanings

    PubMed Central

    Brunt, Elizabeth M.; Kleiner, David E.; Wilson, Laura A.; Belt, Patricia; Neuschwander-Tetri, Brent A.

    2010-01-01

    The diagnosis of nonalcoholic steatohepatitis (NASH) is defined by the presence and pattern of specific histological abnormalities on liver biopsy. A separate system of scoring the features of nonalcoholic fatty liver disease (NA) called the NAFLD Activity Score (NAS) was developed as a tool to measure changes in NAFLD during therapeutic trials. However, some studies have used threshold values of the NAS, specifically NAS ? 5, as a surrogate for the histologic diagnosis of NASH. To evaluate whether this unintended use of the NAS is valid, biopsy and clinical data from the 976 adults in NASH CRN studies were reviewed. Biopsies were evaluated centrally by the NASH CRN Pathology Committee. Definite steatohepatitis (SH) was diagnosed in 58.1%, borderline SH in 19.5% and “not SH” in 22%. The NAS was ? 5 in 50% and ? 4 in 49%; in this cohort only 75% of biopsies with definite SH had a NAS ? 5, while 28% of borderline SH and 7% of "not SH" biopsies had NAS ? 5. Of biopsies with a NAS ? 5, 86% had SH and 3% "not SH". NAS ? 4 did not indicate benign histology; 29% had SH and only 42% had "not SH". Higher values of the NAS were associated with higher levels of ALT and AST, while the diagnosis of SH was associated with features of the metabolic syndrome. Conclusions The diagnosis of definite SH or the absence of SH based on evaluation of patterns as well as individual lesions on liver biopsies does not always correlate with threshold values of the semiquantitative NAS. Clinical trials and observational studies should take these different performance characteristics into account. PMID:21319198

  16. Net analyte signal based two-dimensional (NAS 2D) correlation near infrared spectroscopy

    Microsoft Academic Search

    Ying Geng; Bingren Xiang

    2010-01-01

    A new method of analysis, based on the net analyte signal presented by Lorber is proposed for the two-dimensional correlation near infrared spectroscopy. A spectra data set under the static perturbation of concentration was collected. NAS is manipulated for removing the information that was unrelated to a certain analyte. To demonstrate the potential of NAS 2D correlation spectroscopy, a set

  17. 1.15?Å resolution structure of the proteasome-assembly chaperone Nas2 PDZ domain

    E-print Network

    Singh, Chingakham R.; Lovell, Scott; Mehzabeen, Nurjahan; Chowdhury, Wasimul Q.; Geanes, Eric S.; Battaile, Kevin P.; Roelofs, Jeroen

    2014-04-01

    , binds to the proteasomal AAA-ATPase subunit Rpt5. The PDZ domain of Nas2 binds to the C-terminal tail of Rpt5; however, it does not require the C-terminus of Rpt5 for binding. Here, the 1.15 Å resolution structure of the PDZ domain of Nas2 is reported...

  18. Genome-wide identification, classification and expression profiling of nicotianamine synthase (NAS) gene family in maize

    PubMed Central

    2013-01-01

    Background Nicotianamine (NA), a ubiquitous molecule in plants, is an important metal ion chelator and the main precursor for phytosiderophores biosynthesis. Considerable progress has been achieved in cloning and characterizing the functions of nicotianamine synthase (NAS) in plants including barley, Arabidopsis and rice. Maize is not only an important cereal crop, but also a model plant for genetics and evolutionary study. The genome sequencing of maize was completed, and many gene families were identified. Although three NAS genes have been characterized in maize, there is still no systematic identification of maize NAS family by genomic mining. Results In this study, nine NAS genes in maize were identified and their expression patterns in different organs including developing seeds were determined. According to the evolutionary relationship and tissue specific expression profiles of ZmNAS genes, they can be subgrouped into two classes. Moreover, the expression patterns of ZmNAS genes in response to fluctuating metal status were analysed. The class I ZmNAS genes were induced under Fe deficiency and were suppressed under Fe excessive conditions, while the expression pattern of class II genes were opposite to class I. The complementary expression patterns of class I and class II ZmNAS genes confirmed the classification of this family. Furthermore, the histochemical localization of ZmNAS1;1/1;2 and ZmNAS3 were determined using in situ hybridization. It was revealed that ZmNAS1;1/1;2, representing the class I genes, mainly expressed in cortex and stele of roots with sufficient Fe, and its expression can expanded in epidermis, as well as shoot apices under Fe deficient conditions. On the contrary, ZmNAS3, one of the class II genes, was accumulated in axillary meristems, leaf primordia and mesophyll cells. These results suggest that the two classes of ZmNAS genes may be regulated on transcriptional level when responds to various demands for iron uptake, translocation and homeostasis. Conclusion These results provide significant insights into the molecular bases of ZmNAS in balancing iron uptake, translocation and homeostasis in response to fluctuating environmental Fe status. PMID:23575343

  19. Natural Attenuation Software (NAS): A computer program for estimating remediation times of contaminated groundwater

    USGS Publications Warehouse

    Mendez, E.; Widdowson, M.; Brauner, S.; Chapelle, F.; Casey, C.

    2004-01-01

    This paper describes the development and application of a modeling system called Natural Attenuation Software (NAS). NAS was designed as a screening tool to estimate times of remediation (TORs), associated with monitored natural attenuation (MNA), to lower groundwater contaminant concentrations to regulatory limits. Natural attenuation processes that NAS models include advection, dispersion, sorption, biodegradation, and non-aqueous phase liquid (NAPL) dissolution. This paper discusses the three main interactive components of NAS: 1) estimation of the target source concentration required for a plume extent to contract to regulatory limits, 2) estimation of the time required for NAFL contaminants in the source area to attenuate to a predetermined target source concentration, and 3) estimation of the time required for a plume extent to contract to regulatory limits after source reduction. The model's capability is illustrated by results from a case study at a MNA site, where NAS time of remediation estimates compared well with observed monitoring data over multiple years.

  20. Net analyte signal based two-dimensional (NAS 2D) correlation near infrared spectroscopy

    NASA Astrophysics Data System (ADS)

    Geng, Ying; Xiang, Bingren

    2010-06-01

    A new method of analysis, based on the net analyte signal presented by Lorber is proposed for the two-dimensional correlation near infrared spectroscopy. A spectra data set under the static perturbation of concentration was collected. NAS is manipulated for removing the information that was unrelated to a certain analyte. To demonstrate the potential of NAS 2D correlation spectroscopy, a set of concentration-dependent near infrared spectra of Sinomenine Hydrochloride in methanol was used as an example. The results show that NAS 2D, reconstructed from a series of principal factors can extract more subtle and useful spectra features, and make the band assignment explicable for structure analysis.

  1. Computational Aeroscience at NAS and Future Trends in High Performance Computing

    NASA Technical Reports Server (NTRS)

    Cooper, David M.

    1994-01-01

    NASA's Numerical Aerodynamic Simulation (NAS) program provides a unique world class supercomputing capability which is readily accessed by the U.S. aeronautics community and offers them the opportunity to perform high speed computations and simulations for a broad range of aerospace research applications. In addition, the NAS program performs on-going research and advanced technology development to ensure the innovative application of newly emerging technologies to computational fluid dynamics and other important aeroscience disciplines. The NAS system and its interaction with industry are described. Furthermore, the results of an analysis of current and future technologies and their potential impact on high performance computing are also presented.

  2. Testing New Programming Paradigms with NAS Parallel Benchmarks

    NASA Technical Reports Server (NTRS)

    Jin, H.; Frumkin, M.; Schultz, M.; Yan, J.

    2000-01-01

    Over the past decade, high performance computing has evolved rapidly, not only in hardware architectures but also with increasing complexity of real applications. Technologies have been developing to aim at scaling up to thousands of processors on both distributed and shared memory systems. Development of parallel programs on these computers is always a challenging task. Today, writing parallel programs with message passing (e.g. MPI) is the most popular way of achieving scalability and high performance. However, writing message passing programs is difficult and error prone. Recent years new effort has been made in defining new parallel programming paradigms. The best examples are: HPF (based on data parallelism) and OpenMP (based on shared memory parallelism). Both provide simple and clear extensions to sequential programs, thus greatly simplify the tedious tasks encountered in writing message passing programs. HPF is independent of memory hierarchy, however, due to the immaturity of compiler technology its performance is still questionable. Although use of parallel compiler directives is not new, OpenMP offers a portable solution in the shared-memory domain. Another important development involves the tremendous progress in the internet and its associated technology. Although still in its infancy, Java promisses portability in a heterogeneous environment and offers possibility to "compile once and run anywhere." In light of testing these new technologies, we implemented new parallel versions of the NAS Parallel Benchmarks (NPBs) with HPF and OpenMP directives, and extended the work with Java and Java-threads. The purpose of this study is to examine the effectiveness of alternative programming paradigms. NPBs consist of five kernels and three simulated applications that mimic the computation and data movement of large scale computational fluid dynamics (CFD) applications. We started with the serial version included in NPB2.3. Optimization of memory and cache usage was applied to several benchmarks, noticeably BT and SP, resulting in better sequential performance. In order to overcome the lack of an HPF performance model and guide the development of the HPF codes, we employed an empirical performance model for several primitives found in the benchmarks. We encountered a few limitations of HPF, such as lack of supporting the "REDISTRIBUTION" directive and no easy way to handle irregular computation. The parallelization with OpenMP directives was done at the outer-most loop level to achieve the largest granularity. The performance of six HPF and OpenMP benchmarks is compared with their MPI counterparts for the Class-A problem size in the figure in next page. These results were obtained on an SGI Origin2000 (195MHz) with MIPSpro-f77 compiler 7.2.1 for OpenMP and MPI codes and PGI pghpf-2.4.3 compiler with MPI interface for HPF programs.

  3. 78 FR 46497 - Amendment of Class D and E Airspace, and Establishment of Class E Airspace; Oceana NAS, VA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-01

    ...VA [New] Oceana NAS (Apollo Soucek Field), VA...long. 76[deg]02'13'' W) NALF Fentress...radius of Oceana NAS (Apollo Soucek Field), and within...Amended] Oceana NAS (Apollo Soucek Field) (Lat...long. 76[deg]02'13'' W.) NALF...

  4. 78 FR 21084 - Proposed Amendment of Class D and E Airspace, and Establishment of Class E Airspace; Oceana NAS, VA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-09

    ...VA [New] Oceana NAS (Apollo Soucek Field), VA...long. 76[deg]02'13'' W) NALF Fentress...radius of Oceana NAS (Apollo Soucek Field), and within...Amended] Oceana NAS (Apollo Soucek Field) (lat...long. 76[deg]02'13'' W.) NALF...

  5. Performance assessment of multijunction solar cells incorporating GaInNAsSb

    NASA Astrophysics Data System (ADS)

    Aho, Arto; Tukiainen, Antti; Polojärvi, Ville; Guina, Mircea

    2014-02-01

    We have measured the characteristics of molecular beam epitaxy grown GaInNAsSb solar cells with different bandgaps using AM1.5G real sun illumination. Based on the solar cell diode characteristics and known parameters for state-of-the-art GaInP/GaAs and GaInP/GaAs/Ge cells, we have calculated the realistic potential efficiency increase for GaInP/GaAs/GaInNAsSb and GaInP/GaAs/GaInNAsSb/Ge multijunction solar cells for different current matching conditions. The analyses reveal that realistic GaInNAsSb solar cell parameters, render possible an extraction efficiency of over 36% at 1-sun AM1.5D illumination.

  6. Performance assessment of multijunction solar cells incorporating GaInNAsSb.

    PubMed

    Aho, Arto; Tukiainen, Antti; Polojärvi, Ville; Guina, Mircea

    2014-01-01

    We have measured the characteristics of molecular beam epitaxy grown GaInNAsSb solar cells with different bandgaps using AM1.5G real sun illumination. Based on the solar cell diode characteristics and known parameters for state-of-the-art GaInP/GaAs and GaInP/GaAs/Ge cells, we have calculated the realistic potential efficiency increase for GaInP/GaAs/GaInNAsSb and GaInP/GaAs/GaInNAsSb/Ge multijunction solar cells for different current matching conditions. The analyses reveal that realistic GaInNAsSb solar cell parameters, render possible an extraction efficiency of over 36% at 1-sun AM1.5D illumination. PACS: 88.40.hj; 88.40.jm; 88.40.jp; 81.15.Hi. PMID:24498981

  7. Performance assessment of multijunction solar cells incorporating GaInNAsSb

    PubMed Central

    2014-01-01

    We have measured the characteristics of molecular beam epitaxy grown GaInNAsSb solar cells with different bandgaps using AM1.5G real sun illumination. Based on the solar cell diode characteristics and known parameters for state-of-the-art GaInP/GaAs and GaInP/GaAs/Ge cells, we have calculated the realistic potential efficiency increase for GaInP/GaAs/GaInNAsSb and GaInP/GaAs/GaInNAsSb/Ge multijunction solar cells for different current matching conditions. The analyses reveal that realistic GaInNAsSb solar cell parameters, render possible an extraction efficiency of over 36% at 1-sun AM1.5D illumination. PACS 88.40.hj; 88.40.jm; 88.40.jp; 81.15.Hi PMID:24498981

  8. 1.15?Å resolution structure of the proteasome-assembly chaperone Nas2 PDZ domain

    PubMed Central

    Singh, Chingakham R.; Lovell, Scott; Mehzabeen, Nurjahan; Chowdhury, Wasimul Q.; Geanes, Eric S.; Battaile, Kevin P.; Roelofs, Jeroen

    2014-01-01

    The 26S proteasome is a 2.5?MDa protease dedicated to the degradation of ubiquitinated proteins in eukaryotes. The assembly of this complex containing 66 polypeptides is assisted by at least nine proteasome-specific chaperones. One of these, Nas2, binds to the proteasomal AAA-ATPase subunit Rpt5. The PDZ domain of Nas2 binds to the C-terminal tail of Rpt5; however, it does not require the C-terminus of Rpt5 for binding. Here, the 1.15?Å resolution structure of the PDZ domain of Nas2 is reported. This structure will provide a basis for further insights regarding the structure and function of Nas2 in proteasome assembly. PMID:24699731

  9. 1.15?Å resolution structure of the proteasome-assembly chaperone Nas2 PDZ domain.

    PubMed

    Singh, Chingakham R; Lovell, Scott; Mehzabeen, Nurjahan; Chowdhury, Wasimul Q; Geanes, Eric S; Battaile, Kevin P; Roelofs, Jeroen

    2014-04-01

    The 26S proteasome is a 2.5?MDa protease dedicated to the degradation of ubiquitinated proteins in eukaryotes. The assembly of this complex containing 66 polypeptides is assisted by at least nine proteasome-specific chaperones. One of these, Nas2, binds to the proteasomal AAA-ATPase subunit Rpt5. The PDZ domain of Nas2 binds to the C-terminal tail of Rpt5; however, it does not require the C-terminus of Rpt5 for binding. Here, the 1.15?Å resolution structure of the PDZ domain of Nas2 is reported. This structure will provide a basis for further insights regarding the structure and function of Nas2 in proteasome assembly. PMID:24699731

  10. Structural basis for proteasome formation controlled by an assembly chaperone nas2.

    PubMed

    Satoh, Tadashi; Saeki, Yasushi; Hiromoto, Takeshi; Wang, Ying-Hui; Uekusa, Yoshinori; Yagi, Hirokazu; Yoshihara, Hidehito; Yagi-Utsumi, Maho; Mizushima, Tsunehiro; Tanaka, Keiji; Kato, Koichi

    2014-05-01

    Proteasome formation does not occur due to spontaneous self-organization but results from a highly ordered process assisted by several assembly chaperones. The assembly of the proteasome ATPase subunits is assisted by four client-specific chaperones, of which three have been structurally resolved. Here, we provide the structural basis for the working mechanisms of the last, hereto structurally uncharacterized assembly chaperone, Nas2. We revealed that Nas2 binds to the Rpt5 subunit in a bivalent mode: the N-terminal helical domain of Nas2 masks the Rpt1-interacting surface of Rpt5, whereas its C-terminal PDZ domain caps the C-terminal proteasome-activating motif. Thus, Nas2 operates as a proteasome activation blocker, offering a checkpoint during the formation of the 19S ATPase prior to its docking onto the proteolytic 20S core particle. PMID:24685148

  11. Safety Considerations for Operation of Different Classes of UAVs in the NAS

    E-print Network

    Weibel, Roland E.

    2004-09-20

    Recognizing the significant effort underway to integrate UAV operations in the NAS, a preliminary hazard analysis was conducted for two critical hazards of UAV operation. Models were developed to describe UAV ground impact ...

  12. Unmanned Aircraft Systems (UAS) Integration in the National Airspace System (NAS) Project Subcommittee Final

    NASA Technical Reports Server (NTRS)

    Johnson, Chuck; Griner, James H.; Hayhurst, Kelly J.; Shively, Robert J.; Consiglio, Maria; Muller, Eric; Murphy, James; Kim, Sam

    2012-01-01

    UAS Integration in the NAS Project overview with details from each of the subprojects. Subprojects include: Communications, Certification, Integrated Test and Evaluation, Human Systems Integration, and Separation Assurance/Sense and Avoid Interoperability.

  13. Low temperature grown GaNAsSb: A promising material for photoconductive switch application

    SciTech Connect

    Tan, K. H.; Yoon, S. F.; Wicaksono, S.; Loke, W. K.; Li, D. S. [School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore)] [School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore); Saadsaoud, N.; Tripon-Canseliet, C. [Laboratoire d'Electronique et Electromagnétisme, Pierre and Marie Curie University, 4 Place Jussieu, 75005 Paris (France)] [Laboratoire d'Electronique et Electromagnétisme, Pierre and Marie Curie University, 4 Place Jussieu, 75005 Paris (France); Lampin, J. F.; Decoster, D. [Institute of Electronics, Microelectronics and Nanotechnology (IEMN), UMR CNRS 8520, Universite des Sciences et Technologies de Lille, BP 60069, 59652 Villeneuve d'Ascq Cedex (France)] [Institute of Electronics, Microelectronics and Nanotechnology (IEMN), UMR CNRS 8520, Universite des Sciences et Technologies de Lille, BP 60069, 59652 Villeneuve d'Ascq Cedex (France); Chazelas, J. [Thales Airborne Systems, 2 Avenue Gay Lussac, 78852 Elancourt (France)] [Thales Airborne Systems, 2 Avenue Gay Lussac, 78852 Elancourt (France)

    2013-09-09

    We report a photoconductive switch using low temperature grown GaNAsSb as the active material. The GaNAsSb layer was grown at 200 °C by molecular beam epitaxy in conjunction with a radio frequency plasma-assisted nitrogen source and a valved antimony cracker source. The low temperature growth of the GaNAsSb layer increased the dark resistivity of the switch and shortened the carrier lifetime. The switch exhibited a dark resistivity of 10{sup 7} ? cm, a photo-absorption of up to 2.1 ?m, and a carrier lifetime of ?1.3 ps. These results strongly support the suitability of low temperature grown GaNAsSb in the photoconductive switch application.

  14. GaInNAs Junctions for Next-Generation Concentrators: Progress and Prospects

    SciTech Connect

    Friedman, D. J.; Ptak, A. J.; Kurtz, S. R.; Geisz, J. F.; Kiehl, J.

    2005-08-01

    We discuss progress in the development of GaInNAs junctions for application in next-generation multijunction concentrator cells. A significant development is the demonstration of near-100% internal quantum efficiencies in junctions grown by molecular-beam epitaxy. Testing at high currents validates the compatibility of these devices with concentrator operation. The efficiencies of several next-generation multijunction structures incorporating these state-of-the-art GaInNAs junctions are projected.

  15. The NAS Alert System: a look at the first eight years

    USGS Publications Warehouse

    Fuller, Pam; Neilson, Matt; Huge, Dane H.

    2013-01-01

    The U.S. Geological Survey's Nonindigenous Aquatic Species (NAS) database program (http://nas.er.usgs.gov) tracks the distribution of introduced aquatic organisms across the United States. Awareness of, and timely response to, novel species introductions by those involved in nonindigenous aquatic species management and research requires a framework for rapid dissemination of occurrence data as it is incorporated into the NAS database. In May 2004, the NAS program developed an alert system to notify registered users of new introductions as part of a national early detection/rapid response system. This article summarizes information on system users and dispatched alerts from the system's inception through the end of 2011. The NAS alert system has registered over 1,700 users, with approximately 800 current subscribers. A total of 1,189 alerts had been transmitted through 2011. More alerts were sent for Florida (134 alerts) than for any other state. Fishes comprise the largest taxonomic group of alerts (440), with mollusks, plants, and crustaceans each containing over 100 alerts. Most alerts were for organisms that were intentionally released (414 alerts), with shipping, escape from captivity, and hitchhiking also representing major vectors. To explore the archive of sent alerts and to register, the search and signup page for the alert system can be found online at http://nas.er.usgs.gov/AlertSystem/default.aspx.

  16. Multiscale Habitat Selection by Ruffed Grouse at Low Population Densities (Seleccin de Hbitat a Varias Escalas por Bonasa umbellus a Densidades Poblacionales Bajas)

    E-print Network

    Gutiérrez, R.J.

    a Varias Escalas por Bonasa umbellus a Densidades Poblacionales Bajas) Author(s): Guthrie S. Zimmerman, R óptimo para Bonasa umbellus. Usamos la fase de densidad poblacional pequeña del ciclo de una población de evitar otros tipos de bosque al encontrarse en densidades bajas debido a los beneficios presumibles del

  17. Six Years of Parallel Computing at NAS (1987 - 1993): What Have we Learned?

    NASA Technical Reports Server (NTRS)

    Simon, Horst D.; Cooper, D. M. (Technical Monitor)

    1994-01-01

    In the fall of 1987 the age of parallelism at NAS began with the installation of a 32K processor CM-2 from Thinking Machines. In 1987 this was described as an "experiment" in parallel processing. In the six years since, NAS acquired a series of parallel machines, and conducted an active research and development effort focused on the use of highly parallel machines for applications in the computational aerosciences. In this time period parallel processing for scientific applications evolved from a fringe research topic into the one of main activities at NAS. In this presentation I will review the history of parallel computing at NAS in the context of the major progress, which has been made in the field in general. I will attempt to summarize the lessons we have learned so far, and the contributions NAS has made to the state of the art. Based on these insights I will comment on the current state of parallel computing (including the HPCC effort) and try to predict some trends for the next six years.

  18. UAS in the NAS: Survey Responses by ATC, Manned Aircraft Pilots, and UAS Pilots

    NASA Technical Reports Server (NTRS)

    Comstock, James R., Jr.; McAdaragh, Raymon; Ghatas, Rania W.; Burdette, Daniel W.; Trujillo, Anna C.

    2013-01-01

    NASA currently is working with industry and the Federal Aviation Administration (FAA) to establish future requirements for Unmanned Aircraft Systems (UAS) flying in the National Airspace System (NAS). To work these issues NASA has established a multi-center UAS Integration in the NAS project. In order to establish Ground Control Station requirements for UAS, the perspective of each of the major players in NAS operations was desired. Three on-line surveys were administered that focused on Air Traffic Controllers (ATC), pilots of manned aircraft, and pilots of UAS. Follow-up telephone interviews were conducted with some survey respondents. The survey questions addressed UAS control, navigation, and communications from the perspective of small and large unmanned aircraft. Questions also addressed issues of UAS equipage, especially with regard to sense and avoid capabilities. From the ATC and military ATC perspective, of particular interest is how mixed-operations (manned/UAS) have worked in the past and the role of aircraft equipage. Knowledge gained from this information is expected to assist the NASA UAS in the NAS project in directing research foci thus assisting the FAA in the development of rules, regulations, and policies related to UAS in the NAS.

  19. UAS in the NAS: Survey Responses by ATC, Manned Aircraft Pilots, and UAS Pilots

    NASA Technical Reports Server (NTRS)

    Comstock, James R., Jr.; McAdaragh, Raymon; Ghatas, Rania W.; Burdette, Daniel W.; Trujillo, Anna C.

    2014-01-01

    NASA currently is working with industry and the Federal Aviation Administration (FAA) to establish future requirements for Unmanned Aircraft Systems (UAS) flying in the National Airspace System (NAS). To work these issues NASA has established a multi-center "UAS Integration in the NAS" project. In order to establish Ground Control Station requirements for UAS, the perspective of each of the major players in NAS operations was desired. Three on-line surveys were administered that focused on Air Traffic Controllers (ATC), pilots of manned aircraft, and pilots of UAS. Follow-up telephone interviews were conducted with some survey respondents. The survey questions addressed UAS control, navigation, and communications from the perspective of small and large unmanned aircraft. Questions also addressed issues of UAS equipage, especially with regard to sense and avoid capabilities. From the civilian ATC and military ATC perspectives, of particular interest are how mixed operations (manned / UAS) have worked in the past and the role of aircraft equipage. Knowledge gained from this information is expected to assist the NASA UAS Integration in the NAS project in directing research foci thus assisting the FAA in the development of rules, regulations, and policies related to UAS in the NAS.

  20. Examination of Frameworks for Safe Integration of Intelligent Small UAS into the NAS

    NASA Technical Reports Server (NTRS)

    Logan, Michael J.

    2012-01-01

    This paper discusses a proposed framework for the safe integration of small unmanned aerial systems (sUAS) into the National Airspace System (NAS). The paper briefly examines the potential uses of sUAS to build an understanding of the location and frequency of potential future flight operations based on the future applications of the sUAS systems. The paper then examines the types of systems that would be required to meet the application-level demand to determine "classes" of platforms and operations. A framework for categorization of the "intelligence" level of the UAS is postulated for purposes of NAS integration. Finally, constraints on the intelligent systems are postulated to ensure their ease of integration into the NAS.

  1. Epitaxial growth and picosecond carrier dynamics of GaInAs/GaInNAs superlattices

    SciTech Connect

    Martin, M.; Mangeney, J. [Institut d'Electronique Fondamentale, Universite Paris-Sud XI, UMR 8622 CNRS, 91405 Orsay (France); Travers, L.; Harmand, J. C.; Mauguin, O.; Patriarche, G. [CNRS/LPN, Laboratoire de Photonique et de Nanostructures, 91 460 Marcoussis (France); Minot, C. [CNRS/LPN, Laboratoire de Photonique et de Nanostructures, 91 460 Marcoussis (France); Institut Telecom/Telecom ParisTech, 46 rue Barrault, 75 634 Paris Cedex 13 (France)

    2009-10-05

    We study GaInAs/GaInNAs superlattice structures grown on InP substrate as potential candidates for photoconductive terahertz devices or saturable absorbers working at 1.55 {mu}m wavelength. The N-rich GaInNAs layers are flat, with no three-dimensional islanding, and act as trapping layers where carriers can recombine rapidly. The carrier lifetime in GaInAs/GaInNAs superlattice was measured for various growth parameters using time-resolved differential transmission experiments at 1.55 {mu}m wavelength. The carrier lifetime is found to depend strongly on N content and can be reduced down to 3.8 ps for samples with 14% of N. The mechanisms involved in the capture process of photocarriers are discussed.

  2. GaNAsP: An intermediate band semiconductor grown by gas-source molecular beam epitaxy

    SciTech Connect

    Kuang, Y. J. [Department of Physics, University of California, San Diego, La Jolla, California 92093 (United States)] [Department of Physics, University of California, San Diego, La Jolla, California 92093 (United States); Yu, K. M.; Walukiewicz, W. [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)] [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Kudrawiec, R. [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States) [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Institute of Physics, Wroclaw University of Technology, Wybrzeze, Wyspianskiego 27, 50-370 Wroclaw (Poland); Luce, A. V. [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States) [Electronic Materials Program, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Department of Materials Science and Engineering, University of California, Berkeley, California 94720 (United States); Ting, M. [Department of Mechanical Engineering, University of California, Berkeley, California 94720 (United States)] [Department of Mechanical Engineering, University of California, Berkeley, California 94720 (United States); Tu, C. W. [Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093 (United States)] [Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093 (United States)

    2013-03-18

    Dilute nitride GaNAsP thin films were grown via a GaAsP metamorphic buffer on GaP(100) substrate with gas-source molecular beam epitaxy. The compositions of this III-V-V-V compound were determined by channeling Rutherford backscattering spectroscopy and nuclear reaction analysis. Photoreflectance shows two distinctive transitions from the valence band to the split conduction bands due to N incorporation. Photoluminescence and optical absorption show the fundamental bandgap of Ga(N)AsP is largely tailored by the small amount of N. The observed multiband characteristics and the bandgap tunability of GaNAsP are two merits that fit into the intermediate-band solar cell roadmap, and GaNAsP of high crystal quality provides a strong candidate for intermediate band solar cell materials.

  3. Metalorganic chemical vapor deposition of GaNAs alloys using different Ga precursors

    NASA Astrophysics Data System (ADS)

    Wei, X.; Wang, G. H.; Zhang, G. Z.; Zhu, X. P.; Ma, X. Y.; Chen, L. H.

    2002-03-01

    The GaNAs alloys have been grown by metalorganic chemical vapor deposition (MOCVD) using dimethylhydrazine (DMHy) as the nitrogen precursor, triethylgallium (TEGa) and trimethylgallium (TMGa) as the gallium precursors, respectively. Both symmetric (0 0 4) and asymmetric (1 1 5) high-resolution X-ray diffraction (HRXRD) were used to determine the nitrogen content in GaNAs layers. Secondary ion mass spectrometry (SIMS) was used to obtain the impurity content. The influence of different Ga precursors on GaNAs quality has been investigated. Phase separation is observed in the <1 1 5> direction when using TMGa as the Ga precursor but not observed when using TEGa. This phenomenon should originate from the parasitic reaction between the Ga and N precursors. Furthermore, samples grown with TEGa have better quality and less impurity contamination than those with TMGa. Nitrogen content of 5.742% has been achieved using TEGa and no phase separation observed in the sample.

  4. An Evaluation of the NaS Battery Storage Potential for Providing Regulation Service in California

    SciTech Connect

    Lu, Ning; Weimar, Mark R.; Makarov, Yuri V.; Loutan, Clyde

    2011-03-23

    Sodium sulfur (NaS) batteries can provide energy storage, real-time dispatch, regulation, frequency response, and other essential services to the power grids. This study presents the technical characteristics, modeling approach, methodologies, and results for providing regulation services in the California Independent System Operator (CAISO) market. Two different scenarios were studied and compared: a scenario without intermittent renewable-energy resource penetration (base case) and a scenario with significant renewable-energy resource penetration (including wind) reaching 20% of CAISO’s energy supply. In addition, breakeven cost analyses were developed for four cases. Based on the results of the technical and cost analyses, the opportunities for the NaS battery providing the regulation services are discussed, design improvements for the battery’s physical characteristics are recommended, and modifications of the regulation signals sent to NaS batteries are proposed.

  5. The formation of cubic GaNAs phase during the growth of thin GaNAs epilayers on GaN at low temperatures by metalorganic chemical vapor deposition

    Microsoft Academic Search

    Hyunseok Na; Hyun Jin Kim; Soon-Yong Kwon; Cheolsoo Sone; Euijoon Yoon

    2004-01-01

    20 nm GaNAs epilayers were grown on GaN\\/sapphire by metalorganic chemical vapor deposition. As growth temperature decreased from 720 to 565 °C, it was found that As concentration was increased from 1.3 × 1020 and saturated at about 5-6 × 1020 cm-3. GaAs-like GaNAs islands were formed on GaN at 530 °C. In case of GaNAs epilayers grown at 565

  6. The role of specialized processors in the NAS program - Retrospective/prospective

    NASA Technical Reports Server (NTRS)

    Levin, Eugene; Preston, Frank

    1988-01-01

    The Numerical Aerodynamic Simulation (NAS) Program was initiated by NASA to establish a national resource for scientific research and engineering applications of computational fluid dynamics. This paper examines the changing views of the roles of general purpose and special purpose processors in this program in response to changes in technology as well as changes in perceived needs. The time period covered extends from more than 10 years ago, through the present, and concludes with some speculative concepts for the future roles of specialized processors in the advanced NAS system.

  7. Heavy Metals Need Assistance: The Contribution of Nicotianamine to Metal Circulation Throughout the Plant and the Arabidopsis NAS Gene Family

    PubMed Central

    Schuler, Mara; Bauer, Petra

    2011-01-01

    Understanding the regulated inter- and intra-cellular metal circulation is one of the challenges in the field of metal homeostasis. Inside organisms metal ions are bound to organic ligands to prevent their uncontrolled reactivity and to increase their solubility. Nicotianamine (NA) is one of the important ligands. This non-proteinogenic amino acid is synthesized by nicotianamine synthase (NAS). NA is involved in mobilization, uptake, transport, storage, and detoxification of metals. Much of the progress in understanding NA function has been achieved by studying mutants with altered nicotianamine levels. Mild and strong Arabidopsis mutants impaired in nicotianamine synthesis have been identified and characterized, namely nas4x-1 and nas4x-2. Arabidopsis thaliana has four NAS genes. In this review, we summarize the structure and evolution of the NAS genes in the Arabidopsis genome. We summarize previous results and present novel evidence that the four NAS genes have partially overlapping functions when plants are exposed to Fe deficiency and nickel supply. We compare the phenotypes of nas4x-1 and nas4x-2 and summarize the functions of NAS genes and NA as deduced from the studies of mutant phenotypes. PMID:22639605

  8. Desarrollo de la Escala sobre el Estigma Relacionado con el VIH/SIDA para Profesionales de la Salud mediante el uso de métodos mixtos123

    PubMed Central

    Varas-Díaz, Nelson; Neilands, Torsten B.; Guilamo-Ramos, Vincent; Cintrón Bou, Francheska N.

    2009-01-01

    El estigma relacionado con el VIH/SIDA continúa siendo un obstáculo para la prevención primaria y secundaria del VIH. Las consecuencias para las personas que viven con la enfermedad han sido muy documentadas y continúan siendo una gran preocupación para las personas que proveen servicios de salud y para aquellas que investigan el tema. Estas consecuencias son preocupantes cuando el estigma emana de profesionales de la salud porque se puede limitar el acceso a los servicios. Uno de los principales obstáculos para la investigación del estigma relacionado con el VIH en Puerto Rico es la falta de instrumentos cuantitativos para evaluar las manifestaciones del estigma entre profesionales de la salud. El objetivo principal de este estudio fue desarrollar y probar las propiedades psicométricas de una escala sobre el estigma relacionado con el VIH/SIDA culturalmente apropiada para personas que proveen servicios de salud puertorriqueñas y desarrollar una versión corta de la escala que pudiera usarse en escenarios clínicos con tiempo limitado. El instrumento desarrollado estuvo basado en evidencia cualitativa recopilada entre profesionales y estudiantes de profesiones de la salud puertorriqueños/as (n=80) y administrado a una muestra de 421 profesionales de la salud en adiestramiento. La escala contenía 12 dimensiones del estigma relacionado con el VIH/SIDA. El análisis cuantitativo corroboró 11 de ellas, teniendo como resultado un instrumento con validez y confiabilidad satisfactoria. Estas dimensiones, a su vez, fueron subcomponentes de un factor de estigma general superior. PMID:20333258

  9. Propuesta de autorizacin para entornos Grid basada en la arquitectura NAS-SAML

    E-print Network

    Sánchez Cuenca, Manuel

    Propuesta de autorización para entornos Grid basada en la arquitectura NAS-SAML Manuel Sánchez1 que acceden a sus recursos. Se han propuesto varias arquitecturas de autorización para este tipo de como un recurso más. La arquitectura AAA fue diseñada para resolver este problema usando diferentes

  10. First-Principles Study on Structural and Electronic Properties of ?-S and Na-S Crystals

    NASA Astrophysics Data System (ADS)

    Momida, Hiroyoshi; Yamashita, Tomoki; Oguchi, Tamio

    2014-12-01

    Several Na-S solid phases have been considered to be produced in low-temperature Na/S batteries during charge-discharge reactions. We study structural and electronic properties of ?-S and Na2Sx (x = 1, 2, 4, and 5) crystals using first-principles calculations. Calculated structural properties are in good agreement with experiments, and the van der Waals interactions have an essential role on the cohesive properties in ?-S. The results of energetics and electronic structures show that all the calculated Na-S crystal phases are insulating and are stable relative to the elemental Na and S phases. We estimate voltage curves as a function of the Na concentration in the S-cathode of all-solid Na/S batteries, showing mainly three voltage regions at 2.09-2.11, 1.79, and 1.68 V corresponding to the formations of Na2S5 and Na2S4, Na2S2, and Na2S, respectively, for the assumed four-step reactions on the basis of the phase diagram.

  11. Consistency of TTO-NAS inorganic carbon data with modern measurements

    NASA Astrophysics Data System (ADS)

    Tanhua, Toste; Wallace, Douglas W. R.

    2005-07-01

    We compare alkalinity and total dissolved inorganic carbon (DIC) measurements made during the Transient Tracers in the Ocean, North Atlantic Study (TTO-NAS) in 1981 with modern measurements from a TTO reoccupation cruise in 2004 (M60/5). We find that the TTO-NAS alkalinity values are 3.6 +/- 2.3 ?mol kg-1 higher than modern alkalinity data tied to Certified Reference Materials. The TTO-NAS DIC values re-calculated from original alkalinity and discrete-pCO2 data using currently accepted constants are 3.8 ?mol kg-1 higher than those reported in the revised TTO data set. This difference is reduced to 0.7 ?mol kg-1 when our suggested correction to the TTO-NAS alkalinity is applied. These re-calculated DIC values are 2.4 ?mol kg-1 too low relative to contemporaneous measurements made by the vacuum extraction/manometric Certified method. Application of this correction brings the TTO data into almost perfect agreement with modern measurements for slowly-ventilated deep water of the eastern Atlantic.

  12. Comparison of Origin 2000 and Origin 3000 Using NAS Parallel Benchmarks

    NASA Technical Reports Server (NTRS)

    Turney, Raymond D.

    2001-01-01

    This report describes results of benchmark tests on the Origin 3000 system currently being installed at the NASA Ames National Advanced Supercomputing facility. This machine will ultimately contain 1024 R14K processors. The first part of the system, installed in November, 2000 and named mendel, is an Origin 3000 with 128 R12K processors. For comparison purposes, the tests were also run on lomax, an Origin 2000 with R12K processors. The BT, LU, and SP application benchmarks in the NAS Parallel Benchmark Suite and the kernel benchmark FT were chosen to determine system performance and measure the impact of changes on the machine as it evolves. Having been written to measure performance on Computational Fluid Dynamics applications, these benchmarks are assumed appropriate to represent the NAS workload. Since the NAS runs both message passing (MPI) and shared-memory, compiler directive type codes, both MPI and OpenMP versions of the benchmarks were used. The MPI versions used were the latest official release of the NAS Parallel Benchmarks, version 2.3. The OpenMP versiqns used were PBN3b2, a beta version that is in the process of being released. NPB 2.3 and PBN 3b2 are technically different benchmarks, and NPB results are not directly comparable to PBN results.

  13. A Scalable Implementation of the NAS Parallel Benchmark BT on Distributed Memory Systems

    Microsoft Academic Search

    Vijay K. Naik

    1995-01-01

    In this paper, we describe an efficient and scalable implementation of the NAS Parallel Benchmark BT suitable for distributed memory systems such as the IBM Scalable POWERparallel Systems@. After describing the parallelization and data partitioning methods used, we outline some of the optimization steps used to realize good performance on individual processors and to reduce the communication overheads on the

  14. NAS: the NAIST user authorization management system for network accesses in consideration of system administration volunteers

    Microsoft Academic Search

    Motohiro Ichikawa; Yutaka Nakamura; Eiji Kawai; Kazutoshi Fujikawa; Hideki Sunahara

    2005-01-01

    The Nara Institute of Science and Technology (NAIST) user Authorization management System for network accesses (NAS) was designed and developed as a campus-network management system for administrators who are not information and communications technology (ICT) experts. Student residents have successfully operated the system in the dormitory network since November 2002, in the staff accommodation network by residents since June 2003,

  15. A Descriptive Analysis of Nursing Staff Behaviors in a Teaching Nursing Home: Differences among NAs, LPNs, and RNs.

    ERIC Educational Resources Information Center

    Burgio, Louis D.; And Others

    1990-01-01

    Various staff behaviors in nursing home were sampled 7 times a day, 5 days a week over 37 months and were coded separately for registered nurses (RNs), licensed practical nurses (LPNs), and nurses' aides (NAs). Found LPNs displayed significantly more patient care behaviors and NAs significantly more nonwork behaviors than other nursing staff. RNs…

  16. THE NAS PARALLEL BENCHMARKS D. Bailey, E. Barszcz, J. Barton, D. Browning, R. Carter, L. Dagum, R.

    E-print Network

    Bailey, David H.

    , California. This work is supported through NASA Contract NAS 2-12961. 2 #12;the performance evaluation, Fineberg, Simon and Weer- atunga are with Computer Sciences Corp. (work supported through NASA Contract NAS 2-12961). Schreiber is with RIACS (work funded via NASA cooperative agreement NCC 2-387). Browning

  17. Meeting of Experts on NASA's Unmanned Aircraft System (UAS) Integration in the National Airspace Systems (NAS) Project

    NASA Technical Reports Server (NTRS)

    Wolfe, Jean; Bauer, Jeff; Bixby, C.J.; Lauderdale, Todd; Shively, Jay; Griner, James; Hayhurst, Kelly

    2010-01-01

    Topics discussed include: Aeronautics Research Mission Directorate Integrated Systems Research Program (ISRP) and UAS Integration in the NAS Project; UAS Integration into the NAS Project; Separation Assurance and Collision Avoidance; Pilot Aircraft Interface Objectives/Rationale; Communication; Certification; and Integrated Tests and Evaluations.

  18. Defect study of molecular beam epitaxy grown undoped GaInNAsSb thin film using junction-capacitance spectroscopy

    SciTech Connect

    Monirul Islam, Muhammad; Miyashita, Naoya; Ahsan, Nazmul; Okada, Yoshitaka [Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8904 (Japan)] [Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8904 (Japan)

    2013-02-18

    Defects in undoped GaInNAsSb thin film (i-GaInNAsSb) were investigated by junction-capacitance technique using admittance and transient photocapacitance (TPC) spectroscopy. An electron trap D2 was identified at 0.34 eV below the conduction band (E{sub C}) of i-GaInNAsSb using admittance spectroscopy. Optical transition of valance band (E{sub V}) electrons to a localized state OH1 (E{sub V} + 0.75 eV) was manifested in negative TPC signal. Combined activation energy of OH1 and D2 defect corresponds to the band-gap of i-GaInNAsSb, suggesting that OH1/D2 acts as an efficient recombination center. TPC signal at {approx}1.59 eV above E{sub V} was attributed to the nitrogen-induced localized state in GaInNAsSb.

  19. Ubiquity and Diversity of Heterotrophic Bacterial nasA Genes in Diverse Marine Environments

    PubMed Central

    Jiang, Xuexia; Dang, Hongyue; Jiao, Nianzhi

    2015-01-01

    Nitrate uptake by heterotrophic bacteria plays an important role in marine N cycling. However, few studies have investigated the diversity of environmental nitrate assimilating bacteria (NAB). In this study, the diversity and biogeographical distribution of NAB in several global oceans and particularly in the western Pacific marginal seas were investigated using both cultivation and culture-independent molecular approaches. Phylogenetic analyses based on 16S rRNA and nasA (encoding the large subunit of the assimilatory nitrate reductase) gene sequences indicated that the cultivable NAB in South China Sea belonged to the ?-Proteobacteria, ?-Proteobacteria and CFB (Cytophaga-Flavobacteria-Bacteroides) bacterial groups. In all the environmental samples of the present study, ?-Proteobacteria, ?-Proteobacteria and Bacteroidetes were found to be the dominant nasA-harboring bacteria. Almost all of the ?-Proteobacteria OTUs were classified into three Roseobacter-like groups (I to III). Clone library analysis revealed previously underestimated nasA diversity; e.g. the nasA gene sequences affiliated with ?-Proteobacteria, ?-Proteobacteria and Lentisphaerae were observed in the field investigation for the first time, to the best of our knowledge. The geographical and vertical distributions of seawater nasA-harboring bacteria indicated that NAB were highly diverse and ubiquitously distributed in the studied marginal seas and world oceans. Niche adaptation and separation and/or limited dispersal might mediate the NAB composition and community structure in different water bodies. In the shallow-water Kueishantao hydrothermal vent environment, chemolithoautotrophic sulfur-oxidizing bacteria were the primary NAB, indicating a unique nitrate-assimilating community in this extreme environment. In the coastal water of the East China Sea, the relative abundance of Alteromonas and Roseobacter-like nasA gene sequences responded closely to algal blooms, indicating that NAB may be active participants contributing to the bloom dynamics. Our statistical results suggested that salinity, temperature and nitrate may be some of the key environmental factors controlling the composition and dynamics of the marine NAB communities. PMID:25647610

  20. Ubiquity and Diversity of Heterotrophic Bacterial nasA Genes in Diverse Marine Environments.

    PubMed

    Jiang, Xuexia; Dang, Hongyue; Jiao, Nianzhi

    2015-01-01

    Nitrate uptake by heterotrophic bacteria plays an important role in marine N cycling. However, few studies have investigated the diversity of environmental nitrate assimilating bacteria (NAB). In this study, the diversity and biogeographical distribution of NAB in several global oceans and particularly in the western Pacific marginal seas were investigated using both cultivation and culture-independent molecular approaches. Phylogenetic analyses based on 16S rRNA and nasA (encoding the large subunit of the assimilatory nitrate reductase) gene sequences indicated that the cultivable NAB in South China Sea belonged to the ?-Proteobacteria, ?-Proteobacteria and CFB (Cytophaga-Flavobacteria-Bacteroides) bacterial groups. In all the environmental samples of the present study, ?-Proteobacteria, ?-Proteobacteria and Bacteroidetes were found to be the dominant nasA-harboring bacteria. Almost all of the ?-Proteobacteria OTUs were classified into three Roseobacter-like groups (I to III). Clone library analysis revealed previously underestimated nasA diversity; e.g. the nasA gene sequences affiliated with ?-Proteobacteria, ?-Proteobacteria and Lentisphaerae were observed in the field investigation for the first time, to the best of our knowledge. The geographical and vertical distributions of seawater nasA-harboring bacteria indicated that NAB were highly diverse and ubiquitously distributed in the studied marginal seas and world oceans. Niche adaptation and separation and/or limited dispersal might mediate the NAB composition and community structure in different water bodies. In the shallow-water Kueishantao hydrothermal vent environment, chemolithoautotrophic sulfur-oxidizing bacteria were the primary NAB, indicating a unique nitrate-assimilating community in this extreme environment. In the coastal water of the East China Sea, the relative abundance of Alteromonas and Roseobacter-like nasA gene sequences responded closely to algal blooms, indicating that NAB may be active participants contributing to the bloom dynamics. Our statistical results suggested that salinity, temperature and nitrate may be some of the key environmental factors controlling the composition and dynamics of the marine NAB communities. PMID:25647610

  1. The temperature dependence of atomic incorporation characteristics in growing GaInNAs films

    NASA Astrophysics Data System (ADS)

    Li, Jingling; Zhang, Shuguang; Gao, Fangliang; Wen, Lei; Zhou, Shizhong; Li, Guoqiang

    2015-02-01

    We have systematically studied the temperature dependence of incorporation characteristics of nitrogen (N) and indium (In) in growing GaInNAs films. With the implementation of Monte-Carlo simulation, the low N adsorption energy (-0.10 eV) is demonstrated. To understand the atomic incorporation mechanism, temperature dependence of interactions between Group-III and V elements are subsequently discussed. We find that the In incorporation behaviors rather than that of N are more sensitive to the Tg, which can be experimentally verified by exploring the compositional modulation and structural changes of the GaInNAs films by means of high-resolution X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, and secondary ion mass spectroscopy.

  2. NAS technical summaries. Numerical aerodynamic simulation program, March 1992 - February 1993

    NASA Technical Reports Server (NTRS)

    1994-01-01

    NASA created the Numerical Aerodynamic Simulation (NAS) Program in 1987 to focus resources on solving critical problems in aeroscience and related disciplines by utilizing the power of the most advanced supercomputers available. The NAS Program provides scientists with the necessary computing power to solve today's most demanding computational fluid dynamics problems and serves as a pathfinder in integrating leading-edge supercomputing technologies, thus benefitting other supercomputer centers in government and industry. The 1992-93 operational year concluded with 399 high-speed processor projects and 91 parallel projects representing NASA, the Department of Defense, other government agencies, private industry, and universities. This document provides a glimpse at some of the significant scientific results for the year.

  3. MBE grown GaInNAs solar cells for multijunction applications

    Microsoft Academic Search

    David Jackrel; Homan Yuen; Junxian Fu; Seth Bank; Xiaojun Yu; Zhilong Rao; James S. Harris

    2005-01-01

    Triple-junction cells composed of III-V materials currently hold the world record for photovoltaic efficiency. In order to further increase cell efficiency in the future 4- and 5-junction cells incorporating a sub-cell with a bandgap of roughly 1.0 eV will be required. In this study 1.0 eV bandgap GaInNAs devices grown by solid source molecular beam epitaxy are investigated in terms

  4. Carrier trapping and escape times in p-i-n GaInNAs MQW structures

    PubMed Central

    2014-01-01

    We used a semi-classical model to describe carrier capture into and thermionic escape from GaInNAs/GaAs multiple quantum wells (MQWs) situated within the intrinsic region of a GaAs p-i-n junction. The results are used to explain photocurrent oscillations with applied bias observed in these structures, in terms of charge accumulation and resonance tunnelling. PMID:24417767

  5. Functional Requirements Document for HALE UAS Operations in the NAS: Step 1. Version 3

    NASA Technical Reports Server (NTRS)

    2006-01-01

    The purpose of this Functional Requirements Document (FRD) is to compile the functional requirements needed to achieve the Access 5 Vision of "operating High Altitude, Long Endurance (HALE) Unmanned Aircraft Systems (UAS) routinely, safely, and reliably in the national airspace system (NAS)" for Step 1. These functional requirements could support the development of a minimum set of policies, procedures and standards by the Federal Aviation Administration (FAA) and various standards organizations. It is envisioned that this comprehensive body of work will enable the FAA to establish and approve regulations to govern safe operation of UAS in the NAS on a routine or daily "file and fly" basis. The approach used to derive the functional requirements found within this FRD was to decompose the operational requirements and objectives identified within the Access 5 Concept of Operations (CONOPS) into the functions needed to routinely and safely operate a HALE UAS in the NAS. As a result, four major functional areas evolved to enable routine and safe UAS operations for an on-demand basis in the NAS. These four major functions are: Aviate, Navigate, Communicate, and Avoid Hazards. All of the functional requirements within this document can be directly traceable to one of these four major functions. Some functions, however, are traceable to several, or even all, of these four major functions. These cross-cutting functional requirements support the "Command / Control: function as well as the "Manage Contingencies" function. The requirements associated to these high-level functions and all of their supporting low-level functions are addressed in subsequent sections of this document.

  6. Large-scale structural analysis: The structural analyst, the CSM Testbed and the NAS System

    NASA Technical Reports Server (NTRS)

    Knight, Norman F., Jr.; Mccleary, Susan L.; Macy, Steven C.; Aminpour, Mohammad A.

    1989-01-01

    The Computational Structural Mechanics (CSM) activity is developing advanced structural analysis and computational methods that exploit high-performance computers. Methods are developed in the framework of the CSM testbed software system and applied to representative complex structural analysis problems from the aerospace industry. An overview of the CSM testbed methods development environment is presented and some numerical methods developed on a CRAY-2 are described. Selected application studies performed on the NAS CRAY-2 are also summarized.

  7. NAS Parallel Benchmarks I/O Version 2.4. 2.4

    NASA Technical Reports Server (NTRS)

    Wong, Parkson; VanderWijngaart, Rob F.; Biegel, Bryan A. (Technical Monitor)

    2002-01-01

    We describe a benchmark problem, based on the Block-Tridiagonal (BT) problem of the NAS Parallel Benchmarks (NPB), which is used to test the output capabilities of high-performance computing systems, especially parallel systems. We also present a source code implementation of the benchmark, called NPBIO2.4-MPI, based on the MPI implementation of NPB, using a variety of ways to write the computed solutions to file.

  8. NAS technical summaries: Numerical aerodynamic simulation program, March 1991 - February 1992

    NASA Technical Reports Server (NTRS)

    1992-01-01

    NASA created the Numerical Aerodynamic Simulation (NAS) Program in 1987 to focus resources on solving critical problems in aeroscience and related disciplines by utilizing the power of the most advanced supercomputers available. The NAS Program provides scientists with the necessary computing power to solve today's most demanding computational fluid dynamics problems and serves as a pathfinder in integrating leading-edge supercomputing technologies, thus benefiting other supercomputer centers in Government and industry. This report contains selected scientific results from the 1991-92 NAS Operational Year, March 4, 1991 to March 3, 1992, which is the fifth year of operation. During this year, the scientific community was given access to a Cray-2 and a Cray Y-MP. The Cray-2, the first generation supercomputer, has four processors, 256 megawords of central memory, and a total sustained speed of 250 million floating point operations per second. The Cray Y-MP, the second generation supercomputer, has eight processors and a total sustained speed of one billion floating point operations per second. Additional memory was installed this year, doubling capacity from 128 to 256 megawords of solid-state storage-device memory. Because of its higher performance, the Cray Y-MP delivered approximately 77 percent of the total number of supercomputer hours used during this year.

  9. First-principle natural band alignment of GaN / dilute-As GaNAs alloy

    NASA Astrophysics Data System (ADS)

    Tan, Chee-Keong; Tansu, Nelson

    2015-01-01

    Density functional theory (DFT) calculations with the local density approximation (LDA) functional are employed to investigate the band alignment of dilute-As GaNAs alloys with respect to the GaN alloy. Conduction and valence band positions of dilute-As GaNAs alloy with respect to the GaN alloy on an absolute energy scale are determined from the combination of bulk and surface DFT calculations. The resulting GaN / GaNAs conduction to valence band offset ratio is found as approximately 5:95. Our theoretical finding is in good agreement with experimental observation, indicating the upward movements of valence band at low-As content dilute-As GaNAs are mainly responsible for the drastic reduction of the GaN energy band gap. In addition, type-I band alignment of GaN / GaNAs is suggested as a reasonable approach for future device implementation with dilute-As GaNAs quantum well, and possible type-II quantum well active region can be formed by using InGaN / dilute-As GaNAs heterostructure.

  10. Improved performance of MOVPE-grown GaInNAs quantum wells by control of interfacial strain

    NASA Astrophysics Data System (ADS)

    Kim, Ki-Sung; Yoo, Jae-Ryung; Lim, Sung-Jin; Kim, Ki-Hong; Kim, Taek; Park, Yong-Jo

    2004-12-01

    A comprehensive study to achieve optically efficient GaInNAs quantum wells (QWs) grown by low-pressure metalorganic vapor phase epitaxy (MOVPE) has been accomplished. In order to extend emission wavelength over 1.3 ?m effectively, GaInNAs QW structures with multiple barriers of GaNAs/InGaAs were proposed. Significant improvement of photoluminescence efficiencies and easy controllability of emission wavelengths over the 1.3 ?m range were demonstrated with the proposed structure. It is believed that the wavelengths emitted from our employed QW structures are correlated to the amount of strain, determined by the strain competition between InGaAs (compressive) and GaNAs (tensile) layers. As N contents increased in the QWs, the emission wavelength was able to extend up to 1.38 ?m without deteriorating spectral width.

  11. Effect of antimony on the deep-level traps in GaInNAsSb thin films

    SciTech Connect

    Islam, Muhammad Monirul, E-mail: islam.monir.ke@u.tsukuba.ac.jp; Miyashita, Naoya; Ahsan, Nazmul; Okada, Yoshitaka [Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro ku, Tokyo 153-8904 (Japan); Sakurai, Takeaki; Akimoto, Katsuhiro [Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan)

    2014-09-15

    Admittance spectroscopy has been performed to investigate the effect of antimony (Sb) on GaInNAs material in relation to the deep-level defects in this material. Two electron traps, E1 and E2 at an energy level 0.12 and 0.41?eV below the conduction band (E{sub C}), respectively, were found in undoped GaInNAs. Bias-voltage dependent admittance confirmed that E1 is an interface-type defect being spatially localized at the GaInNAs/GaAs interface, while E2 is a bulk-type defect located around mid-gap of GaInNAs layer. Introduction of Sb improved the material quality which was evident from the reduction of both the interface and bulk-type defects.

  12. Unmanned Aircraft Systems (UAS) Integration in the National Airspace System (NAS) Project. NASA Contributions to the SARP WC Definition

    NASA Technical Reports Server (NTRS)

    Randall, Debra K.; Consiglio, Maria Cristina; Santiago, Confesor

    2014-01-01

    To better inform sense and avoid research needs and to understand ongoing investigation of potential solutions that ultimately lead to the assisting the FAA with their Congressional mandate to fly UAS in the NAS.

  13. The CAS-NAS forum for new leaders in space science

    NASA Astrophysics Data System (ADS)

    Smith, David H.

    The space science community is thoroughly international, with numerous nations now capable of launching scientific payloads into space either independently or in concert with others. As such, it is important for national space-science advisory groups to engage with like-minded groups in other spacefaring nations. The Space Studies Board of the US National Academy of Sciences' (NAS') National Research Council has provided scientific and technical advice to NASA for more than 50 years. Over this period, the Board has developed important multilateral and bilateral partnerships with space scientists around the world. The primary multilateral partner is COSPAR, for which the Board serves as the US national committee. The Board's primary bilateral relationship is with the European Science Foundation’s European Space Science Committee. Burgeoning Chinese space activities have resulted in several attempts in the past decade to open a dialogue between the Board and space scientists in China. On each occasion, the external political environment was not conducive to success. The most recent efforts to engage the Chinese space researchers began in 2011 and have proved particularly successful. Although NASA is currently prohibited from engaging in bilateral activities with China, the Board has established a fruitful dialogue with its counterpart in the Chinese Academy of Sciences (CAS). A joint NAS-CAS activity, the Forum for New Leaders in Space Science, has been established to provide opportunities for a highly select group of young space scientists from China and the United States to discuss their research activities in an intimate and collegial environment at meetings to be held in both nations. The presentation will describe the current state of US-China space relations, discuss the goals of the joint NAS-CAS undertaking and report on the activities at the May, 2014, Forum in Beijing and the planning for the November, 2014, Forum in Irvine, California.

  14. UAS Integration Into the NAS: An Examination of Baseline Compliance in the Current Airspace System

    NASA Technical Reports Server (NTRS)

    Fern, Lisa; Kenny, Caitlin A.; Shively, Robert J.; Johnson, Walter

    2012-01-01

    As a result of the FAA Modernization and Reform Act of 2012, Unmanned Aerial Systems (UAS) are expected to be integrated into the National Airspace System (NAS) by 2015. Several human factors challenges need to be addressed before UAS can safely and routinely fly in the NAS with manned aircraft. Perhaps the most significant challenge is for the UAS to be non-disruptive to the air traffic management system. Another human factors challenge is how to provide UAS pilots with intuitive traffic information in order to support situation awareness (SA) of their airspace environment as well as a see-and-avoid capability comparable to manned aircraft so that a UAS pilot could safely maneuver the aircraft to maintain separation and collision avoidance if necessary. A simulation experiment was conducted to examine baseline compliance of UAS operations in the current airspace system. Researchers also examined the effects of introducing a Cockpit Situation Display (CSD) into a UAS Ground Control Station (GCS) on UAS pilot performance, workload and situation awareness while flying in a positively controlled sector. Pilots were tasked with conducting a highway patrol police mission with a Medium Altitude Long Endurance (MALE) UAS in L.A. Center airspace with two mission objectives: 1) to reroute the UAS when issued new instructions from their commander, and 2) to communicate with Air Traffic Control (ATC) to negotiate flight plan changes and respond to vectoring and altitude change instructions. Objective aircraft separation data, workload ratings, SA data, and subjective ratings regarding UAS operations in the NAS were collected. Results indicate that UAS pilots were able to comply appropriately with ATC instructions. In addition, the introduction of the CSD improved pilot SA and reduced workload associated with UAS and ATC interactions.

  15. A Framework for Safe Integration of Small UAS Into the NAS

    NASA Technical Reports Server (NTRS)

    Logan, Michael J.; Bland, Geoffrey; Murray, Jennifer

    2011-01-01

    This paper discusses a proposed framework for the safe integration of small unmanned aerial systems (sUAS) into the National Airspace System (NAS). The paper examines the potential uses of sUAS to build an understanding of the location and frequency of potential future flight operations based on the future applications of the sUAS systems. The paper then examines the types of systems that would be required to meet the application-level demand to determine classes of platforms and operations. Finally, a framework is proposed for both airworthiness and operations that attempts to balance safety with utility for these important systems.

  16. NAS (Numerical Aerodynamic Simulation Program) technical summaries, March 1989 - February 1990

    NASA Technical Reports Server (NTRS)

    1990-01-01

    Given here are selected scientific results from the Numerical Aerodynamic Simulation (NAS) Program's third year of operation. During this year, the scientific community was given access to a Cray-2 and a Cray Y-MP supercomputer. Topics covered include flow field analysis of fighter wing configurations, large-scale ocean modeling, the Space Shuttle flow field, advanced computational fluid dynamics (CFD) codes for rotary-wing airloads and performance prediction, turbulence modeling of separated flows, airloads and acoustics of rotorcraft, vortex-induced nonlinearities on submarines, and standing oblique detonation waves.

  17. Web Prep: How to Prepare NAS Reports For Publication on the Web

    NASA Technical Reports Server (NTRS)

    Walatka, Pamela; Balakrishnan, Prithika; Clucas, Jean; McCabe, R. Kevin; Felchle, Gail; Brickell, Cristy

    1996-01-01

    This document contains specific advice and requirements for NASA Ames Code IN authors of NAS reports. Much of the information may be of interest to other authors writing for the Web. WebPrep has a graphic Table of Contents in the form of a WebToon, which simulates a discussion between a scientist and a Web publishing consultant. In the WebToon, Frequently Asked Questions about preparing reports for the Web are linked to relevant text in the body of this document. We also provide a text-only Table of Contents. The text for this document is divided into chapters: each chapter corresponds to one frame of the WebToons. The chapter topics are: converting text to HTML, converting 2D graphic images to gif, creating imagemaps and tables, converting movie and audio files to Web formats, supplying 3D interactive data, and (briefly) JAVA capabilities. The last chapter is specifically for NAS staff authors. The Glossary-Index lists web related words and links to topics covered in the main text.

  18. The Performance of the NAS HSPs in 1st Half of 1994

    NASA Technical Reports Server (NTRS)

    Bergeron, Robert J.; Walter, Howard (Technical Monitor)

    1995-01-01

    During the first six months of 1994, the NAS (National Airspace System) 16-CPU Y-MP C90 Von Neumann (VN) delivered an average throughput of 4.045 GFLOPS while the ACSF (Aeronautics Consolidated Supercomputer Facility) 8-CPU Y-MP C90 Eagle averaged 1.658 GFLOPS. The VN rate represents a machine efficiency of 26.3% whereas the Eagle rate corresponds to a machine efficiency of 21.6%. VN displayed a greater efficiency than Eagle primarily because the stronger workload demand for its CPU cycles allowed it to devote more time to user programs and less time to idle. An additional factor increasing VN efficiency was the ability of the UNICOS 8.0 Operating System to deliver a larger fraction of CPU time to user programs. Although measurements indicate increasing vector length for both workloads, insufficient vector lengths continue to hinder HSP (High Speed Processor) performance. To improve HSP performance, NAS should continue to encourage the HSP users to modify their codes to increase program vector length.

  19. Utilizing Traveler Demand Modeling to Predict Future Commercial Flight Schedules in the NAS

    NASA Technical Reports Server (NTRS)

    Viken, Jeff; Dollyhigh, Samuel; Smith, Jeremy; Trani, Antonio; Baik, Hojong; Hinze, Nicholas; Ashiabor, Senanu

    2006-01-01

    The current work incorporates the Transportation Systems Analysis Model (TSAM) to predict the future demand for airline travel. TSAM is a multi-mode, national model that predicts the demand for all long distance travel at a county level based upon population and demographics. The model conducts a mode choice analysis to compute the demand for commercial airline travel based upon the traveler s purpose of the trip, value of time, cost and time of the trip,. The county demand for airline travel is then aggregated (or distributed) to the airport level, and the enplanement demand at commercial airports is modeled. With the growth in flight demand, and utilizing current airline flight schedules, the Fratar algorithm is used to develop future flight schedules in the NAS. The projected flights can then be flown through air transportation simulators to quantify the ability of the NAS to meet future demand. A major strength of the TSAM analysis is that scenario planning can be conducted to quantify capacity requirements at individual airports, based upon different future scenarios. Different demographic scenarios can be analyzed to model the demand sensitivity to them. Also, it is fairly well know, but not well modeled at the airport level, that the demand for travel is highly dependent on the cost of travel, or the fare yield of the airline industry. The FAA projects the fare yield (in constant year dollars) to keep decreasing into the future. The magnitude and/or direction of these projections can be suspect in light of the general lack of airline profits and the large rises in airline fuel cost. Also, changes in travel time and convenience have an influence on the demand for air travel, especially for business travel. Future planners cannot easily conduct sensitivity studies of future demand with the FAA TAF data, nor with the Boeing or Airbus projections. In TSAM many factors can be parameterized and various demand sensitivities can be predicted for future travel. These resulting demand scenarios can be incorporated into future flight schedules, therefore providing a quantifiable demand for flights in the NAS for a range of futures. In addition, new future airline business scenarios are investigated that illustrate when direct flights can replace connecting flights and larger aircraft can be substituted, only when justified by demand.

  20. NAS Demand Predictions, Transportation Systems Analysis Model (TSAM) Compared with Other Forecasts

    NASA Technical Reports Server (NTRS)

    Viken, Jeff; Dollyhigh, Samuel; Smith, Jeremy; Trani, Antonio; Baik, Hojong; Hinze, Nicholas; Ashiabor, Senanu

    2006-01-01

    The current work incorporates the Transportation Systems Analysis Model (TSAM) to predict the future demand for airline travel. TSAM is a multi-mode, national model that predicts the demand for all long distance travel at a county level based upon population and demographics. The model conducts a mode choice analysis to compute the demand for commercial airline travel based upon the traveler s purpose of the trip, value of time, cost and time of the trip,. The county demand for airline travel is then aggregated (or distributed) to the airport level, and the enplanement demand at commercial airports is modeled. With the growth in flight demand, and utilizing current airline flight schedules, the Fratar algorithm is used to develop future flight schedules in the NAS. The projected flights can then be flown through air transportation simulators to quantify the ability of the NAS to meet future demand. A major strength of the TSAM analysis is that scenario planning can be conducted to quantify capacity requirements at individual airports, based upon different future scenarios. Different demographic scenarios can be analyzed to model the demand sensitivity to them. Also, it is fairly well know, but not well modeled at the airport level, that the demand for travel is highly dependent on the cost of travel, or the fare yield of the airline industry. The FAA projects the fare yield (in constant year dollars) to keep decreasing into the future. The magnitude and/or direction of these projections can be suspect in light of the general lack of airline profits and the large rises in airline fuel cost. Also, changes in travel time and convenience have an influence on the demand for air travel, especially for business travel. Future planners cannot easily conduct sensitivity studies of future demand with the FAA TAF data, nor with the Boeing or Airbus projections. In TSAM many factors can be parameterized and various demand sensitivities can be predicted for future travel. These resulting demand scenarios can be incorporated into future flight schedules, therefore providing a quantifiable demand for flights in the NAS for a range of futures. In addition, new future airline business scenarios are investigated that illustrate when direct flights can replace connecting flights and larger aircraft can be substituted, only when justified by demand.

  1. Comparison of 250 MHz R10K Origin 2000 and 400 MHz Origin 2000 Using NAS Parallel Benchmarks

    NASA Technical Reports Server (NTRS)

    Turney, Raymond D.; Thigpen, William W. (Technical Monitor)

    2001-01-01

    This report describes results of benchmark tests on Steger, a 250 MHz Origin 2000 system with R10K processors, currently installed at the NASA Ames National Advanced Supercomputing (NAS) facility. For comparison purposes, the tests were also run on Lomax, a 400 MHz Origin 2000 with R12K processors. The BT, LU, and SP application benchmarks in the NAS Parallel Benchmark Suite and the kernel benchmark FT were chosen to measure system performance. Having been written to measure performance on Computational Fluid Dynamics applications, these benchmarks are assumed appropriate to represent the NAS workload. Since the NAS runs both message passing (MPI) and shared-memory, compiler directive type codes, both MPI and OpenMP versions of the benchmarks were used. The MPI versions used were the latest official release of the NAS Parallel Benchmarks, version 2.3. The OpenMP versions used were PBN3b2, a beta version that is in the process of being released. NPB 2.3 and PBN3b2 are technically different benchmarks, and NPB results are not directly comparable to PBN results.

  2. Security Risk Assessment Process for UAS in the NAS CNPC Architecture

    NASA Technical Reports Server (NTRS)

    Iannicca, Dennis C.; Young, Dennis P.; Thadani, Suresh K.; Winter, Gilbert A.

    2013-01-01

    This informational paper discusses the risk assessment process conducted to analyze Control and Non-Payload Communications (CNPC) architectures for integrating civil Unmanned Aircraft Systems (UAS) into the National Airspace System (NAS). The assessment employs the National Institute of Standards and Technology (NIST) Risk Management framework to identify threats, vulnerabilities, and risks to these architectures and recommends corresponding mitigating security controls. This process builds upon earlier work performed by RTCA Special Committee (SC) 203 and the Federal Aviation Administration (FAA) to roadmap the risk assessment methodology and to identify categories of information security risks that pose a significant impact to aeronautical communications systems. A description of the deviations from the typical process is described in regards to this aeronautical communications system. Due to the sensitive nature of the information, data resulting from the risk assessment pertaining to threats, vulnerabilities, and risks is beyond the scope of this paper.

  3. Security Risk Assessment Process for UAS in the NAS CNPC Architecture

    NASA Technical Reports Server (NTRS)

    Iannicca, Dennis Christopher; Young, Daniel Paul; Suresh, Thadhani; Winter, Gilbert A.

    2013-01-01

    This informational paper discusses the risk assessment process conducted to analyze Control and Non-Payload Communications (CNPC) architectures for integrating civil Unmanned Aircraft Systems (UAS) into the National Airspace System (NAS). The assessment employs the National Institute of Standards and Technology (NIST) Risk Management framework to identify threats, vulnerabilities, and risks to these architectures and recommends corresponding mitigating security controls. This process builds upon earlier work performed by RTCA Special Committee (SC) 203 and the Federal Aviation Administration (FAA) to roadmap the risk assessment methodology and to identify categories of information security risks that pose a significant impact to aeronautical communications systems. A description of the deviations from the typical process is described in regards to this aeronautical communications system. Due to the sensitive nature of the information, data resulting from the risk assessment pertaining to threats, vulnerabilities, and risks is beyond the scope of this paper

  4. Benefits of a Unified LaSRS++ Simulation for NAS-Wide and High-Fidelity Modeling

    NASA Technical Reports Server (NTRS)

    Glaab, Patricia; Madden, Michael

    2014-01-01

    The LaSRS++ high-fidelity vehicle simulation was extended in 2012 to support a NAS-wide simulation mode. Since the initial proof-of-concept, the LaSRS++ NAS-wide simulation is maturing into a research-ready tool. A primary benefit of this new capability is the consolidation of the two modeling paradigms under a single framework to save cost, facilitate iterative concept testing between the two tools, and to promote communication and model sharing between user communities at Langley. Specific benefits of each type of modeling are discussed along with the expected benefits of the unified framework. Current capability details of the LaSRS++ NAS-wide simulations are provided, including the visualization tool, live data interface, trajectory generators, terminal routing for arrivals and departures, maneuvering, re-routing, navigation, winds, and turbulence. The plan for future development is also described.

  5. NasT-Mediated Antitermination Plays an Essential Role in the Regulation of the Assimilatory Nitrate Reductase Operon in Azotobacter vinelandii

    PubMed Central

    Pierson, Leland S.; Rensing, Christopher; Gunatilaka, Malkanthi K.; Kennedy, Christina

    2012-01-01

    Azotobacter vinelandii is a well-studied model system for nitrogen fixation in bacteria. Regulation of nitrogen fixation in A. vinelandii is independent of NtrB/NtrC, a conserved nitrogen regulatory system in proteobacteria. Previous work showed that an ntrC mutation in A. vinelandii resulted in a loss of induction of assimilatory nitrate and nitrite reductases encoded by the nasAB operon. In addition to NtrC, several other proteins, including NasT, a protein containing a potential RNA-binding domain ANTAR (AmiR and NasR transcription antitermination regulators), have been implicated in nasAB regulation. In this work, we characterize the sequence upstream of nasA and identify several DNA sequence elements, including two potential NtrC binding sites and a putative intrinsic transcriptional terminator upstream of nasA that are potentially involved in nasAB regulation. Our analyses confirm that the nasAB promoter, PnasA, is under NtrC control. However, unlike NtrC-regulated promoters in enteric bacteria, PnasA shows high activity in the presence of ammonium; in addition, the PnasA activity is altered in the nifA gene mutation background. We discuss the implication of these results on NtrC-mediated regulation in A. vinelandii. Our study provides direct evidence that induction of nasAB is regulated by NasT-mediated antitermination, which occurs within the leader region of the operon. The results also support the hypothesis that NasT binds the promoter proximal hairpin of nasAB for its regulatory function, which contributes to the understanding of the regulatory mechanism of ANTAR-containing antiterminators. PMID:22773651

  6. National Academy of Sciences (NAS) Study entitled The Effect of Climate Change on Indoor Air Quality and Public Health.

    EPA Science Inventory

    The Institute of Medicine of the NAS is conducting a study to evaluate the state of scientific understanding of the effects of climate change on indoor air quality and public health. General topics may include the likely impacts of climate change in the U.S. on the indoor environ...

  7. Right and Wrong and Cultural Diversity: Replication of the 2002 NAS/Zogby Poll on Business Ethics

    ERIC Educational Resources Information Center

    Ludlum, Marty; Mascaloinov, Sergei

    2004-01-01

    In April 2002, a NAS/Zogby poll found that only a quarter of sampled students perceived uniform standards of "right and wrong" and that most students felt that ethical behavior depends on cultural diversity. In this effort to replicate those findings in a larger sample of American college students, the authors obtained results that contradict the…

  8. Theoretical studies of optical gain tuning by hydrostatic pressure in GaInNAs/GaAs quantum wells

    SciTech Connect

    Gladysiewicz, M.; Wartak, M. S. [Institute of Physics, Wroclaw University of Technology, 50-370 Wroclaw, Wybrzeze Wyspianskiego 27 (Poland); Department of Physics and Computer Science, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5 (Canada); Kudrawiec, R. [Institute of Physics, Wroclaw University of Technology, 50-370 Wroclaw, Wybrzeze Wyspianskiego 27 (Poland)

    2014-01-21

    In order to describe theoretically the tuning of the optical gain by hydrostatic pressure in GaInNAs/GaAs quantum wells (QWs), the optical gain calculations within kp approach were developed and applied for N-containing and N-free QWs. The electronic band structure and the optical gain for GaInNAs/GaAs QW were calculated within the 10-band kp model which takes into account the interaction of electron levels in the QW with the nitrogen resonant level in GaInNAs. It has been shown that this interaction increases with the hydrostatic pressure and as a result the optical gain for GaInNAs/GaAs QW decreases by about 40% and 80% for transverse electric and transverse magnetic modes, respectively, for the hydrostatic pressure change from 0 to 40 kilobars. Such an effect is not observed for N-free QWs where the dispersion of electron and hole energies remains unchanged with the hydrostatic pressure. This is due to the fact that the conduction and valence band potentials in GaInAs/GaAs QW scale linearly with the hydrostatic pressure.

  9. EPA'S REANALYSIS OF KEY ISSUES RELATED TO DIOXIN TOXICITY AND RESPONSE TO NAS COMMENTS (VOLUME 1) (INTERAGENCY SCIENCE DISCUSSION DRAFT)

    EPA Science Inventory

    EPA is releasing the draft report, EPA's Reanalysis of Key Issues Related to Dioxin Toxicity and Response to NAS Comments (Volume 1) , that was distributed to Federal agencies and White House Offices for comment during the Science Discussion step of the ...

  10. Air Traffic Controller Performance and Acceptability of Multiple UAS in a Simulated NAS Environment

    NASA Technical Reports Server (NTRS)

    Vu, Kim-Phuong L.; Strybel, Thomas; Chiappe, Dan; Morales, Greg; Battiste, Vernol; Shively, Robert Jay

    2014-01-01

    Previously, we showed that air traffic controllers (ATCos) rated UAS pilot verbal response latencies as acceptable when a 1.5 s delay was added to the UAS pilot responses, but a 5 s delay was rated as mostly unacceptable. In the present study we determined whether a 1.5 s added delay in the UAS pilots' verbal communications would affect ATCos interactions with UAS and other conventional aircraft when the number and speed of the UAS were manipulated. Eight radar-certified ATCos participated in this simulation. The ATCos managed a medium altitude sector containing arrival aircraft, en route aircraft, and one to four UAS. The UAS were conducting a surveillance mission and flew at either a "slow" or "fast" speed. We measured both UAS and conventional pilots' verbal communication latencies, and obtained ATCos' acceptability ratings for these latencies. Although the UAS pilot response latencies were longer than those of conventional pilots, the ATCos rated UAS pilot verbal communication latencies to be as acceptable as those of conventional pilots. Because the overall traffic load within the sector was held constant, ATCos only performed slightly worse when multiple UAS were in their sector compared to when only one UAS was in the sector. Implications of these findings for UAS integration in the NAS are discussed.

  11. UAS Integration into the NAS: Unmanned Aircraft System (UAS) Delegation of Separation

    NASA Technical Reports Server (NTRS)

    Fern, Lisa Carolynn; Kenny, Caitlin Ailis

    2012-01-01

    FAA Modernization and Reform Act of 2012 mandates UAS integration in the NAS by 2015. Operators must be able to safely maneuver UAS to maintain separation and collision avoidance. Delegated Separation is defined as the transfer of responsibility for maintaining separation between aircraft or vehicles from the air navigation service provider to the relevant flight operator, and will likely begin in sparsely trafficked areas before moving to more heavily populated airspace. As UAS operate primarily in areas with lower traffic density and perform maneuvers routinely that are currently managed through special handling, they have the advantage of becoming an early adopter of delegated separation. This experiment will examine if UAS are capable of performing delegated separation in 5 nm horizontal and 1000 ft vertical distances under two delegation conditions. In Extended Delegation, ATC are in charge of identifying problems and delegating to pilot identification and implementation of the solution and monitoring. In Full Delegation, the pilots are responsible for all tasks related to separation assurance: identification of problems and solutions, implementation and monitoring.

  12. Improvement of Sealing Performance for Nas Battery by a Surface Modification Process

    NASA Astrophysics Data System (ADS)

    Zhang, Gaoxiao; Wen, Zhaoyin; Wu, Xiangwei; Ma, Guoqiang

    2013-07-01

    A gradient film of Na-beta-Al2O3 has been fabricated by a gas-solid reaction method to improve the sealing performance for the Na/S battery. The effect of the substrate surface pre-treatment methods on the thickness of the gradient films and the thermophysical characteristics of the gradient films have been systematically studied. It shows that the pre-treatment method on the surface of the alpha-Al2O3 has a great influence on the thickness of the film. The substrate pre-treated by MgCO3 could react with alpha-Al2O3, accompanied by the generation of spinel MgAl2O4, which could promote the formation of the Na-beta-Al2O3 film, resulting in the thickness of the Na-beta-Al2O3 film as thick as 100?m. The thermal shock resistance and thermal stability of the films were also satisfactory. The constituent of the gradient film was unchanged after thermal shock for 100 times. No micro-crack was observed on the film after heating the sample at 350 °C for 100h. The interfaces between the glass and substrates have also been analyzed.

  13. MPI, HPF or OpenMP: A Study with the NAS Benchmarks

    NASA Technical Reports Server (NTRS)

    Jin, Hao-Qiang; Frumkin, Michael; Hribar, Michelle; Waheed, Abdul; Yan, Jerry; Saini, Subhash (Technical Monitor)

    1999-01-01

    Porting applications to new high performance parallel and distributed platforms is a challenging task. Writing parallel code by hand is time consuming and costly, but the task can be simplified by high level languages and would even better be automated by parallelizing tools and compilers. The definition of HPF (High Performance Fortran, based on data parallel model) and OpenMP (based on shared memory parallel model) standards has offered great opportunity in this respect. Both provide simple and clear interfaces to language like FORTRAN and simplify many tedious tasks encountered in writing message passing programs. In our study we implemented the parallel versions of the NAS Benchmarks with HPF and OpenMP directives. Comparison of their performance with the MPI implementation and pros and cons of different approaches will be discussed along with experience of using computer-aided tools to help parallelize these benchmarks. Based on the study,potentials of applying some of the techniques to realistic aerospace applications will be presented

  14. Laser Gain and Threshold Properties in Compressive-Strained and Lattice-Matched GaInNAs/GaAs Quantum Wells

    SciTech Connect

    Chow, W.W.; Jones, E.D.; Modine, N.A.; Allerman, A.A.; Kurtz, S.R.

    1999-08-04

    The optical gain spectra for compressive-strained and lattice-matched GaInNAs/GaAs quantum wells are computed using a microscopic laser theory. From these spectra, the peak gain and carrier radiative decay rate as functions of carrier density are determined. These dependences allow the study of lasing threshold current density for different GAInNAs/GaAs laser structures.

  15. CURSO DE PS-GRADUAO EM ENGENHARIA E TECNOLOGIA ESPACIAIS

    E-print Network

    , EPUSP, Brasil, 1989 Chen Ying An, Doutor, ITA, Brasil, 1998 Eduardo Abramof, Doutor, Univ. Johannes Kepler, Áustria, 1993 Enzo Granato, Ph.D., Brown University, E.U.A., 1986 Erasmo Assumpção de Andrade e

  16. Performance of BLAS 3, FFTs and NAS Parallel Benchmarks on Cray T3D

    NASA Technical Reports Server (NTRS)

    Saini, Subhash; Simon, Horst D.; Cooper, D. M. (Technical Monitor)

    1994-01-01

    Recently, a Cray T3D Emulator has been made available on the Cray Y-MP and C90 computers. The Pittsburgh Supercomputer Center has acquired a CRAY T3D system and many other centers like Jet Propulsion Laboratory (JPL) will have it by the end of 1994. The Cray T3D system is the firstphase system in Cray Research, Inc.'s (CRI) three-phase massively parallel processing (MPP) program. This system features a heterogeneous architecture that closely couples DEC's ALPHA microprocessors and CRI's parallel-vector technology, i.e. the Cray Y-MP and Cray C90. The Cray T3D Emulator will give prospective users a valuable experience in developing high performance applications on the MPP system. This emulator runs programs written in CRI's MPP Fortran programming model (data sharing and work sharing) or Parallel Virtual Machine (PVM) programming model. It will help the users to study data layout, data locality, and data reference patterns thereby providing feedback which will enable one to write more efficient parallel codes. An overview of the Cray T3D hardware, software, and three of its available programming models is presented.The Cray Fortran Programming Model comprising (a) Data Sharing, (b) Worksharing and (c) Message Passing, will be discussed with examples. We have also implemented distributed BLAS 3 (matrix-matrix multiplication) in data parallel model (using only CSHIFT); worksharing model using block distribution and collapsed distribution; and message passing model using PVM. We have also implemented 2D and 3D FFTs for radix-2 using PVM. The performance of NAS Parallel 'Benchmarks (NPB) on CRAY T3D will be compared with other highly parallel systems such as CM-5, Paragon, C90 etc.

  17. Fluidized Bed Steam Reformer (FBSR) Na-AI-SI (NAS) Waste Form for Hanford LAW and Secondary Waste

    SciTech Connect

    Jantzen, C.; Pierce, E.

    2010-11-01

    FBSR sodium-aluminosilicate (NAS) waste form has been identified as a promising supplemental treatment technology for Hanford LAW and/or Waste Treatment Plant Secondary Waste (WTP-SW). Objectives of the project: 1) Prove the robustness of FBSR as a waste form for either LAW and/or WTP-SW; 2) Reduce the risk associated with implementing the FBSR NAS waste form as a supplemental treatment technology for Hanford LAW and/or WTP-SW; 3) Conduct two treatability studies with SRS radioactive wastes that have been shimmed to look like Hanford WTP-SW and LAW; 4) Conduct three treatability studies with actual Hanford tank wastes; 5) Fill key data gaps; 6) Link previous and new results together.

  18. Photoconductivity and photoluminescence under bias in GaInNAs/GaAs MQW p-i-n structures

    NASA Astrophysics Data System (ADS)

    Khalil, Hagir M.; Royall, Ben; Mazzucato, Simone; Balkan, Naci

    2012-09-01

    The low temperature photoluminescence under bias (PLb) and the photoconductivity (PC) of a p-i-n GaInNAs/GaAs multiple quantum well sample have been investigated. Under optical excitation with photons of energy greater than the GaAs bandgap, PC and PLb results show a number of step-like increases when the sample is reverse biased. The nature of these steps, which depends upon the temperature, exciting wavelength and intensity and the number of quantum wells (QWs) in the device, is explained in terms of thermionic emission and negative charge accumulation due to the low confinement of holes in GaInNAs QWs. At high temperature, thermal escape from the wells becomes much more dominant and the steps smear out.

  19. Photoconductivity and photoluminescence under bias in GaInNAs/GaAs MQW p-i-n structures

    PubMed Central

    2012-01-01

    The low temperature photoluminescence under bias (PLb) and the photoconductivity (PC) of a p-i-n GaInNAs/GaAs multiple quantum well sample have been investigated. Under optical excitation with photons of energy greater than the GaAs bandgap, PC and PLb results show a number of step-like increases when the sample is reverse biased. The nature of these steps, which depends upon the temperature, exciting wavelength and intensity and the number of quantum wells (QWs) in the device, is explained in terms of thermionic emission and negative charge accumulation due to the low confinement of holes in GaInNAs QWs. At high temperature, thermal escape from the wells becomes much more dominant and the steps smear out. PMID:23021540

  20. Nitrogen-concentration control in GaNAs/AlGaAs quantum wells using nitrogen ?-doping technique

    SciTech Connect

    Mano, Takaaki; Jo, Masafumi; Kuroda, Takashi; Noda, Takeshi; Sugimoto, Yoshimasa; Sakuma, Yoshiki [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan); Elborg, Martin; Sakoda, Kazuaki [National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan and Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan)

    2014-05-15

    GaNAs/Al{sub 0.35}Ga{sub 0.65}As multiple quantum wells (MQWs) with nitrogen ?-doping were fabricated on GaAs (100) substrates by plasma-assisted molecular beam epitaxy. High controllability of nitrogen-concentrations in the MQWs was achieved by tuning nitrogen ?-doping time. The maximum nitrogen concentration in the MQWs was 2.8%. The MQWs exhibit intense, narrow photoluminescence emission.

  1. NASA's UAS Integration into the NAS: A Report on the Human Systems Integration Phase 1 Simulation Activities

    NASA Technical Reports Server (NTRS)

    Fern, Lisa; Rorie, R. Conrad; Shively, R. Jay

    2014-01-01

    In 2011 the National Aeronautics and Space Administration (NASA) began a five-year Project to address the technical barriers related to routine access of Unmanned Aerial Systems (UAS) in the National Airspace System (NAS). Planned in two phases, the goal of the first phase was to lay the foundations for the Project by identifying those barriers and key issues to be addressed to achieve integration. Phase 1 activities were completed two years into the five-year Project. The purpose of this paper is to review activities within the Human Systems Integration (HSI) subproject in Phase 1 toward its two objectives: 1) develop GCS guidelines for routine UAS access to the NAS, and 2) develop a prototype display suite within an existing Ground Control Station (GCS). The first objective directly addresses a critical barrier for UAS integration into the NAS - a lack of GCS design standards or requirements. First, the paper describes the initial development of a prototype GCS display suite and supporting simulation software capabilities. Then, three simulation experiments utilizing this simulation architecture are summarized. The first experiment sought to determine a baseline performance of UAS pilots operating in civil airspace under current instrument flight rules for manned aircraft. The second experiment examined the effect of currently employed UAS contingency procedures on Air Traffic Control (ATC) participants. The third experiment compared three GCS command and control interfaces on UAS pilot response times in compliance with ATC clearances. The authors discuss how the results of these and future simulation and flight-testing activities contribute to the development of GCS guidelines to support the safe integration of UAS into the NAS. Finally, the planned activities for Phase 2, including an integrated human-in-the-loop simulation and two flight tests are briefly described.

  2. Unmanned Aircraft Systems (UAS) Integration in the National Airspace System (NAS) Project - Gen-4 and Gen-5 Radio Plans

    NASA Technical Reports Server (NTRS)

    Griner, James H.

    2014-01-01

    NASA's UAS Integration in the NAS project, has partnered with Rockwell Collins to develop a concept Control and Non-Payload Communication (CNPC) system prototype radio, operating on recently allocated UAS frequency spectrum bands. This prototype radio is being used to validate initial proposed performance requirements for UAS control communications. This presentation will give an overview of the current plans for the prototype radio development.

  3. Interdiffused GaInNAsSb Quantum Well on GaAs for 1,300–1,550 nm Diode Lasers

    Microsoft Academic Search

    R. A. Arif; N. Tansu

    Current state-of-the-art GaInNAsSb quantum well lasers emitting in the 1,550 nm regime can only be realized by molecular beam\\u000a epitaxy due to the ease and efficient incorporation of Sb-species into the GaInNAs material system. The pursuit of GaInNAsSb\\u000a materials systems by metalorganic chemical vapor deposition is still immature due to the challenges in incorporating Sb- and\\u000a dilute-N-species into GaInAs layer

  4. My Documents\\Presentations\\IFE\\NAS\\JCF_IFE_NAS_LANL_V4Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA U N C L A S S I F I E D Slide 1

    E-print Network

    significant benefits in power plant development, operations and evolution. · Taking advantage of significant development is funded by the Office of Fusion Energy Sciencewhile High Average PowerLasers (HAPL) are funded\\Presentations\\IFE\\NAS\\JCF_IFE_NAS_LANL_V4Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA U N C L

  5. THE NAS PARALLEL BENCHMARKS D. H. Bailey1, E. Barszcz1, J. T. Barton1, D. S. Browning2, R. L. Carter, L.

    E-print Network

    Bailey, David H.

    author is an employee of Computer Sciences Corporation. This work is supported through NASA Contract NAS 2-12961. 3This author is an employee of the Research Institute for Advanced Computer Science (RIACS

  6. ECR-MBE growth and patterning of GaInNAs/GaAs quantum wells for 1st order DFB lasers

    NASA Astrophysics Data System (ADS)

    Reinhardt, M.; Fischer, M.; Forchel, A.

    2000-05-01

    We report on the growth, fabrication and characterization of 1st order DFB lasers on GaInNAs. A good quaternary GaInNAs layer quality could be achieved by using solid source molecular beam epitaxy and an electron cyclotron resonance source for nitrogen generation. GaInNAs QW's with nitrogen contents of about 0.5% embedded in separate confinement heterostructure lasers were pumped optically and electrically. The evanescent field of the laser mode couples strongly to the effective refractive index modulation of a DFB grating. Monomode emission peaks depending on the grating period are obtained at room temperature emitting in the 1.1 ?m range. In addition, pulsed room-temperature operation of 1.28 ?m GaInNAs broad area laserdiodes is achieved. This could be realized by increasing the nitrogen content of the active layer to about 1%.

  7. 1.55 {mu}m GaAs/GaNAsSb/GaAs optical waveguides grown by radio frequency nitrogen plasma-assisted molecular beam epitaxy

    SciTech Connect

    Tan, K. H.; Yoon, S. F.; Loke, W. K.; Wicaksono, S.; Xu, Z.; Ng, T. K.; Lew, K. L. [School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore); Saadsaoud, N.; Zegaoui, M.; Decoster, D. [Institute of Electronics, Microelectronics and Nanotechnology (IEMN), UMR CNRS 8520, Universite des Sciences et Technologies de Lille BP 60069, 59652 Villeneuve d'Ascq Cedex (France); Chazelas, J. [Thales Airborne Systems, 2 Avenue Gay Lussac, 78852 Elancourt (France)

    2008-03-17

    We demonstrate a 1.55 {mu}m GaAs/GaNAsSb/GaAs optical waveguide grown by molecular beam epitaxy as an alternative to the AlGaAs/GaAs system. The 0.4-{mu}m-thick GaNAsSb guiding layer contains {approx}3.5% of N and 9% of Sb, resulting in optical band gap of 0.88 eV. The refractive index of the GaNAsSb layer was measured from 800 to 1700 nm. The GaNAsSb layer has a refractive index value of 3.42 at 1.55 {mu}m wavelength. The propagation loss measured using the Fabry-Perot resonance method was found to be affected by nitrogen-related defect absorption.

  8. Workshop: Novos Avanos nas Tecnologias de Laser Scanner Aerotransportvel (New Advancements in Airborne Lidar Technology) Coordenadores: Jorge Centeno (UFPR) e Edson Mitishita (UFPR)

    E-print Network

    Workshop: Novos Avanços nas Tecnologias de Laser Scanner Aerotransportável (New Advancements tecnologia para a extração de densa informação tridimensional georreferenciada. O desempenho dos sistemas lidar tem aumentado consideravelmente nos últimos 5 a 6 anos. Os sistemas atuais possuem tecnologias que

  9. Remotely Operated Aircraft (ROA) Impact on the National Airspace System (NAS) Work Package: Data Modeling and Sharing Perspective for Development of a Common Operating Picture

    NASA Technical Reports Server (NTRS)

    2007-01-01

    This report documents analyses that were performed in support of Task #3 of Work Package #3 (WP3), ROA Impact on the NAS. The purpose of the overall work package was to determine if there are any serious issues that would prevent or prohibit ROA's flying in the NAS on a routine basis, and if so, what actions should be taken to address them. The purpose of Task #3 was to look at this problem from the perspective of data modeling and sharing.

  10. Functional characteristics of NaS2, a placenta-specific Na+-coupled transporter for sulfate and oxyanions of the micronutrients selenium and chromium.

    PubMed

    Miyauchi, S; Srinivas, S R; Fei, Y-J; Gopal, E; Umapathy, N S; Wang, H; Conway, S J; Ganapathy, V; Prasad, P D

    2006-01-01

    NaS2 is a Na+-coupled transporter for sulfate that belongs to the SLC13 gene family. This transporter was originally cloned from high endothelial venule endothelial cells, but nothing is known about the functional characteristics of this transporter except that it transports sulfate in a Na+-coupled manner. Northern blot analysis indicates that NaS2 is expressed most robustly in placenta. In the present study, we cloned NaS2 from rat placenta and characterized its transport function in detail using the Xenopus laevis oocyte expression system. Rat NaS2 consists of 629 amino acids and is highly similar to human NaS2. In situ hybridization studies with mouse placental sections show that NaS2 transcripts are expressed primarily in trophoblasts of the labyrinth zone. The expression of the transporter is confirmed in primary cultures of trophoblasts isolated from human placenta. When expressed in X. laevis oocytes, rat NaS2 mediates Na+-coupled transport of sulfate. The transport of sulfate is inhibited by oxyanions of selenium, chromium, arsenic, molybdenum, and phosphorous, suggesting that the transporter may mediate the transport of these oxyanions in addition to sulfate. The Kt for sulfate is 153+/-30 microM and the Na+:sulfate stoichiometry is 3:1. The transport process is electrogenic as evidenced from the inhibition of the uptake process by K+-induced depolarization. We conclude that NaS2 is a placenta-specific Na+-coupled, electrogenic, transporter for sulfate expressed in trophoblasts and that it is also responsible for the transport of oxyanions of the micronutrients selenium and chromium. PMID:16129486

  11. The CSM testbed software system: A development environment for structural analysis methods on the NAS CRAY-2

    NASA Technical Reports Server (NTRS)

    Gillian, Ronnie E.; Lotts, Christine G.

    1988-01-01

    The Computational Structural Mechanics (CSM) Activity at Langley Research Center is developing methods for structural analysis on modern computers. To facilitate that research effort, an applications development environment has been constructed to insulate the researcher from the many computer operating systems of a widely distributed computer network. The CSM Testbed development system was ported to the Numerical Aerodynamic Simulator (NAS) Cray-2, at the Ames Research Center, to provide a high end computational capability. This paper describes the implementation experiences, the resulting capability, and the future directions for the Testbed on supercomputers.

  12. Minimum Capacity of NaS Battery according to Capacity of PV System in a Microgrid under 30 min Power Balancing Control

    NASA Astrophysics Data System (ADS)

    Shimakage, Toyonari; Sone, Akihito; Sumita, Jiro; Kato, Takeyoshi; Suzuoki, Yasuo

    On constructing a microgrid, it is essential to design capacity of photovoltaic power generation (PV) systems and storage batteries in accordance with a control target. In this study, we constructed a simulation model of energy control system in the microgrid used in the demonstration project. By using this model, we investigated the minimum capacity of NaS battery for different PV system capacities for keeping the target power imbalance within ±3% over 30 min. The main results are as follows. The microgrid involving 330-kW PV systems (corresponding to the actual system) needs a NaS battery capacity of at least approximately ±20kW, and PV systems with a capacity up to about 890kW can be integrated in the microgrid with a NaS battery capacity of ±500kW (corresponding to the actual system). We estimated the minimum capacity of NaS battery for different PV system capacities and clarified that the output behavior of the NaS battery and PAFC when supply and demand power imbalance over 30 min. exceeds the ±3% limit. We suggested the improved control model and showed that it is effective in decreasing the minimum capacity of NaS battery, although it has negative effects on the reduction of short-period power flow fluctuation at the grid-connection point.

  13. Time-resolved photoluminescence studies of annealed 1.3-?m GaInNAsSb quantum wells

    PubMed Central

    2014-01-01

    Time-resolved photoluminescence (PL) was applied to study the dynamics of carrier recombination in GaInNAsSb quantum wells (QWs) emitting near 1.3 ?m and annealed at various temperatures. It was observed that the annealing temperature has a strong influence on the PL decay time, and hence, it influences the optical quality of GaInNAsSb QWs. At low temperatures, the PL decay time exhibits energy dependence (i.e., the decay times change for different energies of emitted photons), which can be explained by the presence of localized states. This energy dependence of PL decay times was fitted by a phenomenological formula, and the average value of E0, which describes the energy distribution of localized states, was extracted from this fit and found to be smallest (E0?=?6 meV) for the QW annealed at 700°C. In addition, the value of PL decay time at the peak energy was compared for all samples. The longest PL decay time (600 ps) was observed for the sample annealed at 700°C. It means that based on the PL dynamics, the optimal annealing temperature for this QW is approximately 700°C. PMID:24533740

  14. Remotely Operated Aircraft (ROA) Impact on the National Airspace System (NAS) Work Package, 2005: Composite Report on FAA Flight Plan and Operational Evaluation Plan. Version 7.0

    NASA Technical Reports Server (NTRS)

    2005-01-01

    The purpose of this document is to present the findings that resulted from a high-level analysis and evaluation of the following documents: (1) The OEP (Operational Evolution Plan) Version 7 -- a 10-year plan for operational improvements to increase capacity and efficiency in U.S. air travel and transport and other use of domestic airspace. The OEP is the FAA commitment to operational improvements. It is outcome driven, with clear lines of accountability within FAA organizations. The OEP concentrates on operational solutions and integrates safety, certification, procedures, staffing, equipment, avionics and research; (2) The Draft Flight Plan 2006 through 2010 -- a multi-year strategic effort, setting a course for the FAA through 2001, to provide the safest and most efficient air transportation system in the world; (3) The NAS System Architecture Version 5 -- a blueprint for modernizing the NAS and improving NAS services and capabilities through the year 2015; and (4) The NAS-SR-1000 System Requirements Specification (NASSRS) -- a compilation of requirements which describe the operational capabilities for the NAS. The analysis is particularly focused on examining the documents for relevance to existing and/or planned future UAV operations. The evaluation specifically focuses on potential factors that could materially affect the development of a commercial ROA industry, such as: (1) Design limitations of the CNS/ATM system, (2) Human limitations, The information presented was taken from program specifications or program office lead personnel.

  15. Transmission electron microscopy study of GaInNAs(Sb) thin films grown by atomic hydrogen-assisted molecular beam epitaxy

    SciTech Connect

    Oshima, R. [Research Center for Advanced Science and Technology (RCAST), University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan); National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan); Huang, J. Y.; Ponce, F. A. [Department of Physics, Arizona State University, Tempe, Arizona 85287-1504 (United States); Miyashita, N.; Okada, Y. [Research Center for Advanced Science and Technology (RCAST), University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan); Matsubara, K. [National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan)

    2011-11-07

    The quaternary GaInNAs is a promising material system for use in next generation multijunction photovoltaic devices. We have investigated the effect of introducing antimony on the growth by using transmission electron microscopy and energy dispersive x-ray (EDX) spectroscopy. Two-dimensional growth was observed in GaInNAs films with striation features associated with compositional fluctuation and nanometer scale elemental segregation on the growth front. On the contrary, GaInNAsSb films exhibit uniform contrast throughout. EDX profile indicates uniform compositional distribution, as antimony atoms suppress the surface mobilites of adatoms resulting in a lower probability to generate the favored bonds, such as Ga-N and In-As.

  16. High-speed picosecond pulse response GaNAsSb p-i-n photodetectors grown by rf plasma-assisted nitrogen molecular beam epitaxy

    NASA Astrophysics Data System (ADS)

    Tan, K. H.; Yoon, S. F.; Loke, W. K.; Wicaksono, S.; Lew, K. L.; Stöhr, A.; Ecin, O.; Poloczek, A.; Malcoci, A.; Jäger, D.

    2007-04-01

    The authors report on picosecond pulse response GaNAsSb /GaAs p-i-n photodetectors grown by molecular beam epitaxy in conjunction with a rf plasma-assisted nitrogen source. The 2?m thick GaNAsSb photoabsorption layer contains 3.3% of N and 8% of Sb resulting in a dc photoresponse up to 1380nm wavelength. Dark current densities at 0 and -5V are 1.6×10-5 and 13A /cm2, respectively. The GaNAsSb photodiodes exhibit a record pulse response width of only 40.5ps (full width at half maximum) corresponding to a 4.5GHz bandwidth.

  17. Loss of Rpt5 protein interactions with the core particle and Nas2 protein causes the formation of faulty proteasomes that are inhibited by Ecm29 protein.

    PubMed

    Lee, Stella Yu-Chien; De la Mota-Peynado, Alina; Roelofs, Jeroen

    2011-10-21

    The proteasome is a large and complex protease formed by 66 polypeptides. The assembly of the proteasome is assisted by at least nine chaperones. One of these chaperones, Nas2/p27, binds to the C-terminal region of the AAA-ATPase Rpt5. We report here that the tail of Rpt5 provides two functions. First, it facilitates the previously reported interaction with the proteasome core particle (CP). Second, it is essential for the interaction with Nas2. Deletion of the C-terminal amino acid of Rpt5 disrupts the CP interaction, but not the binding to Nas2. The latter is surprising considering Nas2 contains a PDZ domain, which is often involved in binding to C termini. Interestingly, deletion of the last three amino acids interferes with both functions. The disruption of the Rpt5-CP interactions gave distinct phenotypes different from disruption of the Nas2-Rpt5 interaction. Additionally, proteasomes purified from a Saccharomyces cerevisiae rpt5-?3 strain show a strong enrichment of Ecm29. The function of Ecm29, a proteasome-associated protein, is not well understood. Our data show that Ecm29 can inhibit proteasomes, because our Ecm29-containing proteasomes have reduced suc-LLVY-AMC hydrolytic activity. Consistent with this apparent role as negative regulator, the deletion of ECM29 rescues the phenotypes of rpt5-?3 and nas2? in an hsm3? background. In sum, the interactions facilitated by the tail of Rpt5 act synergistically to minimize the formation of faulty proteasomes, thereby preventing recognition and inhibition by Ecm29. PMID:21878651

  18. Loss of Rpt5 Protein Interactions with the Core Particle and Nas2 Protein Causes the Formation of Faulty Proteasomes That Are Inhibited by Ecm29 Protein*

    PubMed Central

    Lee, Stella Yu-Chien; De La Mota-Peynado, Alina; Roelofs, Jeroen

    2011-01-01

    The proteasome is a large and complex protease formed by 66 polypeptides. The assembly of the proteasome is assisted by at least nine chaperones. One of these chaperones, Nas2/p27, binds to the C-terminal region of the AAA-ATPase Rpt5. We report here that the tail of Rpt5 provides two functions. First, it facilitates the previously reported interaction with the proteasome core particle (CP). Second, it is essential for the interaction with Nas2. Deletion of the C-terminal amino acid of Rpt5 disrupts the CP interaction, but not the binding to Nas2. The latter is surprising considering Nas2 contains a PDZ domain, which is often involved in binding to C termini. Interestingly, deletion of the last three amino acids interferes with both functions. The disruption of the Rpt5-CP interactions gave distinct phenotypes different from disruption of the Nas2-Rpt5 interaction. Additionally, proteasomes purified from a Saccharomyces cerevisiae rpt5-?3 strain show a strong enrichment of Ecm29. The function of Ecm29, a proteasome-associated protein, is not well understood. Our data show that Ecm29 can inhibit proteasomes, because our Ecm29-containing proteasomes have reduced suc-LLVY-AMC hydrolytic activity. Consistent with this apparent role as negative regulator, the deletion of ECM29 rescues the phenotypes of rpt5-?3 and nas2? in an hsm3? background. In sum, the interactions facilitated by the tail of Rpt5 act synergistically to minimize the formation of faulty proteasomes, thereby preventing recognition and inhibition by Ecm29. PMID:21878651

  19. "Na orgem da ideia de fronteiras mveis: limites polticos e migraes nas geografias de Friedrich Ratzel e Elise Reclus", Continentes, Revista de Geografia UFRRJ, n. 4, 2014

    E-print Network

    Boyer, Edmond

    .br/revistaconti/index.php/continentes/article/view/38 [Texte] [Texte] AS ORIGENS DA NOÇÃO DE "FRONTEIRAS MÓVEIS" Limites Políticos e Migrações nas of the idea of "mobile borders" : political limits and migrations in Friedrich Ratzel's and Élisée Reclus in the historical process. Keywords: Élisée Reclus; Friedrich Ratzel; borders; politics; History of Geographical

  20. On the Fermi level pinning in as-grown GaInNAs(Sb)/GaAs quantum wells with indium content of 8%-32%

    NASA Astrophysics Data System (ADS)

    Kudrawiec, R.; Yuen, H. B.; Bank, S. R.; Bae, H. P.; Wistey, M. A.; Harris, James S.; Motyka, M.; Misiewicz, J.

    2008-08-01

    Modified van Hoof structures containing GaInNAs(Sb) quantum wells (QWs) with indium content varying from 8% to 32% have been investigated using contactless electroreflectance (CER) spectroscopy. In CER spectra, both the QW transitions and GaAs-related Franz-Keldysh oscillations (FKOs) have been clearly observed. The band gap discontinuity at the GaInNAs(Sb)/GaAs interface has been determined by analyzing the QW transitions. The built-in electric field in the GaAs cap layer has been extracted from the FKO periodicity. The Fermi level position in the GaInNAs(Sb) QW has been determined through knowledge of the electric field in the GaAs cap layer and band gap discontinuity in the GaInNAs(Sb)/GaAs QW. It has been found that the Fermi level is pinned for all samples at the same energy, ˜4.7 eV below the vacuum level. The Fermi level is located very close to the Fermi level stabilization energy, ˜4.9 eV below the vacuum level. A high concentration of native point defects in the as-grown material is the reason for the Fermi level pinning at this energy.

  1. Podemos considerar que os nossos eventos comearam em 1979, quando foi realizado o primeiro encontro de qumicos tericos nas dependncias do CBPF, no Rio de Janeiro, que

    E-print Network

    Ferreira, Márcia M. C.

    primeiro encontro de químicos teóricos nas dependências do CBPF, no Rio de Janeiro, que deu origem ao I um caráter interdisciplinar, com presença constante de químicos e físicos, mas também de biofísicos, bioquímicos, cientistas de materiais, etc. Também merece ser destacado o crescimento do número de

  2. do Rio de JaneiRo e So Paulo: PaRa PRefeito e PReSidente naS cidadeS

    E-print Network

    do Rio de JaneiRo e São Paulo: PaRa PRefeito e PReSidente naS cidadeS a geogRafia do voto na Janeiro e São Paulo: 1996-2010 Cesar Romero Jacob Pontifícia Universidade Católica do Rio de Janeiro Rio de Janeiro, Brasil Dora Rodrigues Hees Pontifícia Universidade Católica do Rio de Janeiro Rio de

  3. Self-consistent gain analysis of type-II `W' InGaNGaNAs quantum well Hongping Zhao, Ronald A. Arif, and Nelson Tansu

    E-print Network

    Gilchrist, James F.

    A. Arif, and Nelson Tansu Citation: J. Appl. Phys. 104, 043104 (2008); doi: 10.1063/1.2970107 View-consistent gain analysis of type-II `W' InGaN­GaNAs quantum well lasers Hongping Zhao,a Ronald A. Arif, and Nelson

  4. GaInNAs-based Hellish-vertical cavity semiconductor optical amplifier for 1.3 ?m operation.

    PubMed

    Chaqmaqchee, Faten Adel Ismail; Mazzucato, Simone; Oduncuoglu, Murat; Balkan, Naci; Sun, Yun; Gunes, Mustafa; Hugues, Maxime; Hopkinson, Mark

    2011-01-01

    Hot electron light emission and lasing in semiconductor heterostructure (Hellish) devices are surface emitters the operation of which is based on the longitudinal injection of electrons and holes in the active region. These devices can be designed to be used as vertical cavity surface emitting laser or, as in this study, as a vertical cavity semiconductor optical amplifier (VCSOA). This study investigates the prospects for a Hellish VCSOA based on GaInNAs/GaAs material for operation in the 1.3-?m wavelength range. Hellish VCSOAs have increased functionality, and use undoped distributed Bragg reflectors; and this coupled with direct injection into the active region is expected to yield improvements in the gain and bandwidth. The design of the Hellish VCSOA is based on the transfer matrix method and the optical field distribution within the structure, where the determination of the position of quantum wells is crucial. A full assessment of Hellish VCSOAs has been performed in a device with eleven layers of Ga0.35In0.65N0.02As0.08/GaAs quantum wells (QWs) in the active region. It was characterised through I-V, L-V and by spectral photoluminescence, electroluminescence and electro-photoluminescence as a function of temperature and applied bias. Cavity resonance and gain peak curves have been calculated at different temperatures. Good agreement between experimental and theoretical results has been obtained. PMID:21711630

  5. GaInNAs-based Hellish-vertical cavity semiconductor optical amplifier for 1.3 ?m operation

    PubMed Central

    2011-01-01

    Hot electron light emission and lasing in semiconductor heterostructure (Hellish) devices are surface emitters the operation of which is based on the longitudinal injection of electrons and holes in the active region. These devices can be designed to be used as vertical cavity surface emitting laser or, as in this study, as a vertical cavity semiconductor optical amplifier (VCSOA). This study investigates the prospects for a Hellish VCSOA based on GaInNAs/GaAs material for operation in the 1.3-?m wavelength range. Hellish VCSOAs have increased functionality, and use undoped distributed Bragg reflectors; and this coupled with direct injection into the active region is expected to yield improvements in the gain and bandwidth. The design of the Hellish VCSOA is based on the transfer matrix method and the optical field distribution within the structure, where the determination of the position of quantum wells is crucial. A full assessment of Hellish VCSOAs has been performed in a device with eleven layers of Ga0.35In0.65N0.02As0.08/GaAs quantum wells (QWs) in the active region. It was characterised through I-V, L-V and by spectral photoluminescence, electroluminescence and electro-photoluminescence as a function of temperature and applied bias. Cavity resonance and gain peak curves have been calculated at different temperatures. Good agreement between experimental and theoretical results has been obtained. PMID:21711630

  6. Utility experience with a 250-kW molten carbonate fuel cell cogeneration power plant at NAS Miramar, San Diego

    NASA Astrophysics Data System (ADS)

    Figueroa, R. A.; Otahal, J.

    This paper focuses on the strategy and experience of San Diego Gas and Electric with the development and demonstration of a proof of concept 250-kW internally manifolded heat exchanger (IMHEX®) carbonate fuel cell power plant. The plant was installed, commissioned, and operated by San Diego Gas and Electric (SDG&E) in a cogeneration mode at the Naval Air Station (NAS) at Miramar in San Diego. These activities were part of a collaborative effort between SDG&E and M-C Power's Program team (IMHEX® Team). The IMHEX® Team consists of M-C Power, Bechtel Engineering, Stewart and Stevenson, and the Institute of Gas Technology (IGT). The technical aspects of the plant's commissioning and operation were addressed by my colleague, J. Otahal, in a poster presentation. Our activities in carbonate fuel cell development are unique because of the level of involvement by an investor-owned utility in the development, engineering, installation, operation and maintenance of a fuel cell demonstration plant. The following topics are discussed in this paper: (i) SDG&E's involvement in the development of molten carbonate fuel cell (MCFC) technology; (ii) the active role in engineering and specification of the IMHEX® MCFC demonstration plant; (iii) responsibility for installation, commissioning, and operation; (iv) utility role in technology development and application of MCFC in a restructured and competitive environment; (v) summary.

  7. Study of a 1?eV GaNAsSb photovoltaic cell grown on a silicon substrate

    SciTech Connect

    Tan, K. H.; Loke, W. K.; Wicaksono, S.; Li, D.; Leong, Y. R.; Yoon, S. F. [School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore)] [School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 (Singapore); Sharma, P.; Milakovich, T.; Bulsara, M. T.; Fitzgerald, E. A. [Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139 (United States)] [Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139 (United States)

    2014-03-10

    We report the performance of a 1?eV GaNAsSb photovoltaic cell grown on a Si substrate with a SiGe graded buffer grown using molecular beam epitaxy. For comparison, the performance of a similar 1?eV GaN{sub 0.018}As{sub 0.897}Sb{sub 0.085} photovoltaic cell grown on a GaAs substrate was also reported. Both devices were in situ annealed at 700?°C for 5?min, and a significant performance improvement over our previous result was observed. The device on the GaAs substrate showed a low open circuit voltage (V{sub OC}) of 0.42?V and a short circuit current density (J{sub SC}) of 23.4?mA/cm{sup 2} while the device on the Si substrate showed a V{sub OC} of 0.39?V and a J{sub SC} of 21.3?mA/cm{sup 2}. Both devices delivered a quantum efficiency of 50%–55% without any anti-reflection coating.

  8. Accelerations experienced during low-G flight of Black Brant VC (NAS 21.015) on 4 October 1974

    NASA Technical Reports Server (NTRS)

    Kissel, R.

    1975-01-01

    This investigation was to determine whether a Black Brant VC (BBVC) sounding rocket equipped with the Goddard Space Flight Center (GSFC) rate control system (RCS) would produce g-levels which are satisfactory for space processing. Accelerations measured by the Marshall Space Flight Center (MSFC) low-g accelerometer system (LGAS) were compared with accelerations calculated from measured payload RCS gyro data during a low-g flight of BBVC NAS 21.015 at White Sands Missile Range, N.M., on October 4, 1974. Accelerations of up to 0.0002 g existed at the LGAS accelerometers from 70 through 420 sec (5.8 min), with the exception of a spike at 101 sec of 0.0004 g which occurred when the RCS was activated the second time. Accelerations of 0.0001 g existed from 140 through 400 sec (4.3 min). Accelerations of 0.0002 g along the roll axis up to 150 sec and of 0.0015 g in the lateral plane at about 135 sec are being investigated by GSFC. They may be associated with leaking thruster valves or a leak in one of the heat pipe experiments. The vehicle rate buildup each time after the RCS nulls out are also being investigated by GSFC. This rate caused most of the 0.0001 g acceleration experienced after 150 sec into the flight. Aerodynamic drag produced no significant accelerations after about 80 sec. The principal conclusion was that the BBVC with the GSFC RCS produces g-levels satisfactory for space processing.

  9. Nonlinear dynamics of non-equilibrium holes in p-type modulation-doped GaInNAs/GaAs quantum wells

    PubMed Central

    2011-01-01

    Nonlinear charge transport parallel to the layers of p-modulation-doped GaInNAs/GaAs quantum wells (QWs) is studied both theoretically and experimentally. Experimental results show that at low temperature, T = 13 K, the presence of an applied electric field of about 6 kV/cm leads to the heating of the high mobility holes in the GaInNAs QWs, and their real-space transfer (RST) into the low-mobility GaAs barriers. This results in a negative differential mobility and self-generated oscillatory instabilities in the RST regime. We developed an analytical model based upon the coupled nonlinear dynamics of the real-space hole transfer and of the interface potential barrier controlled by space-charge in the doped GaAs layer. Our simulation results predict dc bias-dependent self-generated current oscillations with frequencies in the high microwave range. PMID:21711766

  10. Weather Requirements and Procedures for Step 1: High Altitude Long Endurance (HALE) Unmanned Aircraft System (UAS) Flight Operations in the National Air Space (NAS)

    NASA Technical Reports Server (NTRS)

    2007-01-01

    This cover sheet is for version 2 of the weather requirements document along with Appendix A. The purpose of the requirements document was to identify and to list the weather functional requirements needed to achieve the Access 5 vision of "operating High Altitude, Long Endurance (HALE) Unmanned Aircraft Systems (UAS) routinely, safely, and reliably in the National Airspace System (NAS) for Step 1." A discussion of the Federal Aviation Administration (FAA) references and related policies, procedures, and standards is provided as basis for the recommendations supported within this document. Additional procedures and reference documentation related to weather functional requirements is also provided for background. The functional requirements and related information are to be proposed to the FAA and various standards organizations for consideration and approval. The appendix was designed to show that sources of flight weather information are readily available to UAS pilots conducting missions in the NAS. All weather information for this presentation was obtained from the public internet.

  11. Unmanned Aircraft Systems (UAS) Integration in the National Airspace System (NAS) Project, UAS Control and Non-Payload Communication System Phase-1 Flight Test Results

    NASA Technical Reports Server (NTRS)

    Griner, James H.

    2014-01-01

    NASA's UAS Integration in the NAS project, has partnered with Rockwell Collins to develop a concept Control and Non-Payload Communication (CNPC) system prototype radio, operating on recently allocated UAS frequency spectrum bands. This prototype radio is being used to validate initial proposed performance requirements for UAS control communications. This presentation will give an overview of the current status of the prototype radio development, and results from phase 1 flight tests conducted during 2013.

  12. Room temperature performance of low threshold 1.34-1.44-?m GaInNAs-GaAs quantum-well lasers grown by molecular beam epitaxy

    Microsoft Academic Search

    A. Hierro; J. M. Ulloa; E. Calleja; B. Damilano; J. Barjon; J.-Y. Duboz; J. Massies

    2005-01-01

    Room temperature lasing emission at 1.338 and 1.435 ?m with threshold current densities of 1518 and 1755 A\\/cm2, respectively, is obtained in broad area GaInNAs-GaAs laser diodes (LDs) grown by molecular beam epitaxy. The 1.338-?m LDs show a power output per facet up to 0.20 W\\/A, a characteristic temperature (T0) of 78 K, and an external transparency current density (Jtr)

  13. Improved Performance of GaInNAs Solar Cells Grown by Molecular-Beam Epitaxy Using Increased Growth Rate Instead of Surfactants

    SciTech Connect

    Ptak, A. J.; France, R.; Jiang, C. S.; Romero, M. J.

    2009-01-01

    GaInNAs is potentially useful for increasing the conversion efficiency of multijunction solar cells if low photocurrents and photovoltages can be increased. Wide-depletion width devices generate significant photocurrents using an n-i-p structure grown by molecular-beam epitaxy, but these wide depletion widths are only realized in a region of parameter space that leads to rough surface morphologies. Surfactants are effective at reducing the surface roughness, but lead to increased defect densities and changes in the net acceptor or donor concentration. Here, we show that increasing the growth rate of GaInNAs solar cells leads to smooth surfaces without the use of a surfactant, even at high In compositions and substrate temperatures. No degradation in material quality is observed when increasing the growth rate from 1.5 to 3.0 {micro}m/h, but a shunt resistance does appear for the high-growth-rate samples. This shunt is attributed to increased spitting of the Ga cell, leading to an increase in the oval defect density, at the higher effusion cell temperatures used to achieve high growth rates. As with the case of Bi in GaInNAs, increased growth rates also appear to increase the net donor concentration, but it is not clear if these effects have the same cause.

  14. Identification of nitrogen- and host-related deep-level traps in n-type GaNAs and their evolution upon annealing

    SciTech Connect

    Gelczuk, ?., E-mail: lukasz.gelczuk@pwr.edu.pl [Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Janiszewskiego 11/17, 50-372 Wroclaw (Poland); Kudrawiec, R., E-mail: robert.kudrawiec@pwr.edu.pl [Institute of Physics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw (Poland); Henini, M. [School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD (United Kingdom)

    2014-07-07

    Deep level traps in as-grown and annealed n-GaNAs layers (doped with Si) of various nitrogen concentrations (N?=?0.2%, 0.4%, 0.8%, and 1.2%) were investigated by deep level transient spectroscopy. In addition, optical properties of GaNAs layers were studied by photoluminescence and contactless electroreflectance. The identification of N- and host-related traps has been performed on the basis of band gap diagram [Kudrawiec, Appl. Phys. Lett. 101, 082109 (2012)], which assumes that the activation energy of electron traps of the same microscopic nature decreases with the rise of nitrogen concentration in accordance with the N-related shift of the conduction band towards trap levels. The application of this diagram has allowed to investigate the evolution of donor traps in GaNAs upon annealing. In general, it was observed that the concentration of N- and host-related traps decreases after annealing and PL improves very significantly. However, it was also observed that some traps are generated due to annealing. It explains why the annealing conditions have to be carefully optimized for this material system.

  15. USO DE MICROCONTROLADORES E REALIDADE VIRTUAL NA AGRICULTURA

    Microsoft Academic Search

    André Torre Neto; Paulo Estevão Cruvinel

    Os sistemas de aquisição automática de dados evoluíram consideravelmente nas últimas duas décadas, principalmente, devido aos avanços tecnológicos da eletrônica digital e ao advento dos microprocessadores. A tecnologia atual possibilita a construção de sistemas microcontrolados bastante eficientes e a baixos custos. Inúmeras são as áreas que se beneficiam com esses sistemas, tais como: as indústrias, a medicina, as pesquisas espaciais,

  16. InAsN /GaAs(N) quantum-dot and InGaNAs /GaAs quantum-well emitters: A comparison

    NASA Astrophysics Data System (ADS)

    Bais, G.; Cristofoli, A.; Jabeen, F.; Piccin, M.; Carlino, E.; Rubini, S.; Martelli, F.; Franciosi, A.

    2005-06-01

    We compare the luminescence from InAsN /GaAs and InAsN /GaAsN quantum dots with that obtained from InGaNAsN /GaAs quantum wells grown in the same experimental system. All structures were engineered to emit near 1.3?m at room temperature. Quantum-dot emitters were found to exhibit higher thermal stability and did not require postgrowth annealing. The use of GaAsN barriers as opposed to GaAs barriers provided for narrower and more intense quantum-dot luminescence.

  17. p- to n-type conductivity transition in 1.0 eV GaInNAs solar cells controlled by the V/III ratio

    NASA Astrophysics Data System (ADS)

    Langer, Fabian; Perl, Svenja; Höfling, Sven; Kamp, Martin

    2015-02-01

    In this work, we report a p- to n-type conductivity transition of GaInNAs (1.0 eV bandgap) layers in p-i-n dilute nitride solar cells continuously controlled by the V/III ratio during growth. Near the transition region, we were able to produce GaInNAs layers with very low effective electrically active doping concentrations resulting in wide depleted areas. We obtained internal quantum efficiencies (IQEs) up to 85% at 0.2 eV above the bandgap. However, the high IQE comes along with an increased dark current density resulting in a decreased open circuit voltage of about 0.2 V. This indicates the formation of non-radiant defect centers related to the p-type to n-type transition. Rapid-thermal annealing of the solar cells on the one hand helps to anneal some of these defects but on the other hand increases the effective doping concentrations.

  18. Nitrogen-related changes in exciton localization and dynamics in GaInNAs/GaAs quantum wells grown by metalorganic vapor phase epitaxy

    NASA Astrophysics Data System (ADS)

    Baranowski, M.; Kudrawiec, R.; Misiewicz, J.; Hammar, M.

    2015-02-01

    In this work, we show the results of low-temperature photoluminescence (PL), time-resolved photoluminescence, and photoreflectance (PR) investigations, performed on a series of three Ga0.64In0.34As1- x N x /GaAs single quantum wells (SQW) grown by metalorganic vapor phase epitaxy with the nitrogen content of 0, 0.5, and 0.8 %. Comparing the PL and PR data, we show that at low excitation intensity and temperature, the radiative recombination occurs via localizing centers (LCs) in all samples. The excitation intensity-dependent PL measurements combined with theoretical modeling of hopping excitons in this system allow us to provide quantitative information on the disorder parameters describing population of LCs. It has been found that the average energy of LCs increases about two times and simultaneously the number of LCs increases about 10 and 20 times after the incorporation of 0.5 and 0.8 % of nitrogen, respectively. The value of average localization energy ? 0 determined for N-containing samples (~6-7 meV) is in the range typical for dilute nitride QWs grown by molecular beam epitaxy (MBE). On the other hand, the "effective" concentration of LCs seems to be higher than for GaInNAs/GaAs QW grown by MBE. The dramatic increase in localizing centers also affects the PL dynamics. Observed PL decay time dispersion is much stronger in GaInNAs SQW than in nitrogen-free SQW. The change in PL dynamic is very well reproduced by model of hopping excitons.

  19. População estelar jovem em galáxias irregulares próximas

    NASA Astrophysics Data System (ADS)

    Guimarães, T. A.; Telles, E.

    2003-08-01

    A análise do conteúdo estelar de galáxias próximas através da fotometria das suas estrelas resolvidas nos fornece informações importantes sobre a história de formação estelar e os processos de formação estelar em galáxias, que estão diretamente ligados ao estudo de evolução de galáxias. Quando nenhuma estrela puder ser resolvida o método mais poderoso consiste na análise do conteúdo estelar integrado das galáxias através das suas cores integradas em conjunto com informação espectroscópica que combinados com modelos de síntese evolutiva podem restringir simultaneamente a função de massa inicial (IMF) e a taxa de formação estelar (SFR). Nesse contexto, galáxias do tipo tardio, em particular, irregulares, são relevantes por várias razões: elas são objetos relativamente simples, com alta atividade de formação estelar e são objetos relativamente jovens (geralmente apresentam baixas abundâncias de elementos pesados e grande quantidade de gás). Apresentamos uma análise fotométrica de uma amostra de 7 galáxias do tipo tardio do universo local (NGC 2366, NGC 4395, NGC 4656, NGC 4214, NGC 4236, HOII, IC2574) que foram observadas com uma boa resolução espacial nas bandas B, V e R no telescópio Isaac Newton de 2.5m de Roque de los Muchachos nas Ilhas Canárias, Espanha. A distribuição espacial da população estelar jovem dessas galáxias é discutida sobre os pontos de vista dos íindices de cor integrados e dos seus diagramas cor magnitude, que comparados com isócronas teóricas, nos fornecem informações sobre os eventos de formação estelar, como por exemplo, indicações sobre a idade dos mesmos. As principais conclusões do trabalho podem ser resumidas em: (i) As galáxias irregulares possuem formação estelar recente (FE) espalhada ocorrendo nos últimos 50 Manos; (ii) A formação estelar em galáxias irregulares não é auto-propagante em escalas globais ( > 100 pc) ; (iii) A FE pode ser auto-regulável em escalas espaciais de poucas dezenas de parsec; (iv) As galáxias irregulares sofreram um evento principal de FE há 1010 anos atrás, o que implica que houve um momento na evolução do universo onde a maior parte das estrelas se formaram em galáxias.

  20. Recent results of plasma research activities at the Instituto de Pesquisas Espaciais

    Microsoft Academic Search

    J. J. Barroso; J. A. Bittencourt; R. S. Dallaqua; E. Delbosco; A. Ferreira; J. L. Ferreira; G. P. Galvao; R. M. O. Galvao; G. O. Ludwig; A. Montes

    1987-01-01

    Results of experiments performed at the Institute for Space Research (INPE) are reported. An enrichment of 390 percent of carbon isotopes was achieved in the plasma centrifuge. The role of ion-acoustic turbulence in the formation of double layers was experimentally investigated. The turbulent spectrum was measured and agrees quite well with the prediction of the modified Kadomtsev renormalized theory. The

  1. INPE Ministrio da Cincia e Tecnologia Instituto Nacional de Pesquisas Espaciais

    E-print Network

    PLASMA S�O JOS� DOS CAMPOS, SP ABRIL 2003 #12;1 ÍNDICE RESUMO adquiridos no atual projeto da FAPESP. Os primeiros experimentos do monotron revelaram um bom desempenho do investigados teórica e experimentalmente; a teoria é comparada com os experimentos em cavidades com 4 e 8

  2. MINISTRIO DA CINCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS INPE

    E-print Network

    Cadastro de Downloads (NCD)................................................... 14 3.7. Receita própria.4. Revistas Nacionais ­ QUALIS C OU SEM QUALIS (7)................................... 24 7. LIVROS............................................................................................................ 25 7.1. Livros Internacionais C/ ISBN (4

  3. INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS Edital n 6 de 10 de Setembro de 2012

    E-print Network

    Espacial LOCAL DAS PROVAS: Sala de reuniões C - 1o andar - Torre A - LIT - INPE/São José dos Campos/SP Nome: Eletricidade Atmosférica LOCAL DAS PROVAS: Sala de reuniões C - 1o andar - Torre A - LIT - INPE/São José dos: Sensoriamento Remoto LOCALIDADE: Sala de Video-Conferência - INPE/Belém/PA Nome do Candidato Data Horário MARCOS

  4. Instituto Nacional de Pesquisas Espaciais Exame para o curso de ps-graduao em Astrofsica

    E-print Network

    for Extraterrestrial Intelligence), afirmava que o grande radiotelescópio de Arecibo, em Porto Rico, "pode detectar um magnético? b) A que aceleração ele é submetido? #12;6. Frank Drake, um dos criadores do projeto SETI (Search

  5. Map of a UAV flight operation in the NAS at the JER. The initial external pilot (EP) position is at P0. The UAV is launched at the red cross position into the

    E-print Network

    Map of a UAV flight operation in the NAS at the JER. The initial external pilot (EP) position holding orbit. Once the EP has moved from P0 to P1, the UAV acquires imagery over the first flight area to study area, go into photo flight pattern, return to landing site, all autonomously. Reason we can't do

  6. IOV&T OTM MrOYtXt^CLl Nas universidades portuguesas nasceram ou esto a surgir tecnologias capazes de conquistar o interesse de todo o mundo. Das criaes que salvam vidas,

    E-print Network

    Instituto de Sistemas e Robotica

    ÍÍIOV&T OTM MrOYtXt^CLl Nas universidades portuguesas nasceram ou estão a surgir tecnologias capazes de conquistar o interesse de todo o mundo. Das criações que salvam vidas, como tecnologias de Crohn. Entretanto, Pedro Andrade desenvolveu uma nova tecnologia para a empresa, a Cordsafe, que

  7. Corte nas bolsas de doutoramento

    E-print Network

    Instituto de Sistemas e Robotica

    . Anualmente, a FCT, a fundação es- tatal que gere uma parte importante do financiamento que vai para a ciên, no auge do financiamento para a ciência em Portugal, chegaram a ser atribu- ídas 2031 bolsas de Portugal subiu para o nível europeu. No en- tanto, desde 2010 que as bolsas atri- buídas têm vindo

  8. Investigation of the seasonal and local time variations of the high-altitude sporadic Na layer (Nas) formation and the associated midlatitude descending E layer (Es) in lower E region

    NASA Astrophysics Data System (ADS)

    Yuan, T.; Wang, Jihong; Cai, Xuguang; Sojka, J.; Rice, D.; Oberheide, J.; Criddle, N.

    2014-07-01

    Recent studies have suggested that the major reservoir for the sporadic sodium layer (Nas) above 95 km in altitude is likely the sodium ion (Na+) within the sporadic E layer (Es) in the lower E region. However, theoretical and laboratory works have demonstrated that the metal ion's neutralization process is quite difficult above 100 km, while intensive neutral metal layers are consistently observed in the lower E region between 100 km and 125 km. In this paper, the multiyear observations of a Na lidar and an ionosonde at Utah State University (41.7°N, 111.8°W) and the nearby Bear Lake Observatory (41.9°N, 111.4°W) are utilized to understand their seasonal and local time variations. The comparison study between this set of the Nas and the nocturnal Nas observations in Beijing China (40.2°N, 116.1°E) reveals similar variations, but major differences are also noticed. To investigate the mechanism of these variations, the Hamburg Model of the Neutral and Ionized Atmosphere and the Climatological Tidal Model of the Thermosphere are utilized to simulate the ion vertical drift in the lower E region. The simulation shows that the lower E region is dominated by convergence of metal ions in summer, and ion diffusion prevails during winter. The tidal wind modulates the ion vertical drift speed and increases the likelihood of Es evolution at certain local times during the summer, while the tidal components of atmospheric density facilitate Nas formation by neutralizing the Na+ within the Es.

  9. Evaluation of HRI facilities at NS Mayport and NAS Jacksonville, Florida - lessons learned report (heat recovery facility). Final report. [Waste disposal and energy recovery from Heat Recovery Incinerator (HRI)

    SciTech Connect

    Frounfelker, R.; Belencan, H.

    1984-07-01

    The Naval Station (NS) Mayport and Naval Air Station (NAS), Jacksonville, Florida, heat recovery incinerator (HRI) facilities employ two different technological approaches to perform the twofold task of base-generated waste disposal and energy recovery. The NS Mayport HRI utilizes a single 50-ton per day (TPD) field-erected, excess-air, grate incinerator to mass burn the as-received waste. A pit/crane is used to store and retrieve the waste. The NAS Jacksonville HRI utilizes three 24-TPD modular starved-air, refractory hearth incinerators to burn a refuse-derived fuel (RDF) waste. The RDF processing system is located on site, and a live-bottom bin is employed for storage and retrieval of the RDF. The NS Mayport HRI is operational and burns an average of 1.25 tons/hr (TPH) of solid waste 4 to 5 days/wk. The NAS Jacksonville HRI is not operational and has been closed since June 1983. The objective of this report is to evaluate and compare the performance of these two concepts and to make recommendations concerning future applications within the Navy Shore establishment. In addition, the report defines the lessons learned from the design, construction, and operation of these two facilities. To meet these objectives, the feasibility studies, design documents, and operational data from the two HRI facilities were reviewed. Additional information was obtained from site visits and discussions with facility operators and personnel associated with the various phases of these two projects. 25 refs., 28 figs., 16 tabs.

  10. Electric Machines with Non-Radially Mounted Rectangular Permanent Magnets / Elektrisk?s Maš?nas Ar Prizmatiskiem Neradi?li Novietotiem Past?v?gajiem Magn?tiem

    NASA Astrophysics Data System (ADS)

    Levin, N.; Pugachev, V.; Dirba, J.; Lavrinovicha, L.

    2013-04-01

    The authors analyze the advantages and disadvantages of brushless synchronous electric machines with radially and non-radially mounted rectangular permanent magnets. The results show that the proposed nonradial mounting of permanent magnets considered in the paper, in several cases (e.g. multi-pole brushless generators with tooth windings of the armature) allows achievement of the following advantages: better technology of manufacturing the electric machine owing to simple packing of the stator winding in the stator open slots, which also increases the copper slot fillfactor; reduction in the mass-and-size of permanent magnets at least twice; significantly lower cost of the electric machine; and, finally, its greater specific power. Darb? tiek analiz?tas priekšroc?bas un tr?kumi sinhron?m bezkontaktu maš?n?m ar radi?li un neradi?li novietotiem prizmatiskiem past?v?gajiem magn?tiem. Par?d?ts, ka vair?kos gad?jumos, piem?ram, daudzpolu bezkontaktu sinhronajos ?eneratoros ar zobu tinumiem, neradi?ls past?v?go magn?tu izvietojums nodrošina vair?kas priekšroc?bas: uzlabojas maš?nas izgatavošanas tehnolo?ija, jo statora atv?rtaj?s riev?s viegl?k novietot tinumus un iesp?jams sasniegt augst?ku rievas aizpild?juma koeficientu; samazin?s past?v?go magn?tu masa un izmaksas; palielin?s maš?nas ?patn?ja jauda.

  11. Cancer risk assessment foundation unraveling: New historical evidence reveals that the US National Academy of Sciences (US NAS), Biological Effects of Atomic Radiation (BEAR) Committee Genetics Panel falsified the research record to promote acceptance of the LNT.

    PubMed

    Calabrese, Edward J

    2015-04-01

    The NAS Genetics Panel (1956) recommended a switch from a threshold to a linear dose response for radiation risk assessment. To support this recommendation, geneticists on the panel provided individual estimates of the number of children in subsequent generations (one to ten) that would be adversely affected due to transgenerational reproductive cell mutations. It was hoped that there would be close agreement among the individual risk estimates. However, extremely large ranges of variability and uncertainty characterized the wildly divergent expert estimates. The panel members believed that sharing these estimates with the scientific community and general public would strongly undercut their linearity recommendation, as it would have only highlighted their own substantial uncertainties. Essentially, their technical report in the journal Science omitted and misrepresented key adverse reproductive findings in an effort to ensure support for their linearity recommendation. These omissions and misrepresentations not only belie the notion of an impartial and independent appraisal by the NAS Panel, but also amount to falsification and fabrication of the research record at the highest possible level, leading ultimately to the adoption of LNT by governments worldwide. Based on previously unexamined correspondence among panel members and Genetics Panel meeting transcripts, this paper provides the first documentation of these historical developments. PMID:25600588

  12. Uma viagem pelo mundo nanoUma viagem pelo mundo nano Naira Maria Balzaretti

    E-print Network

    dos Santos, C.A.

    Nanotecnologia ­ CNANO UFRGS fonte: seminfonte: semináário de João Schmidtrio de João Schmidt #12 biológicas diferenciadas NANOTECNOLOGIA #12;"Desenvolvimento de pesquisa e tecnologia nas escalas atômica nanotecnologia incluem a manipulação sob controle das estruturas na nanoescala e sua integração em componentes

  13. The Genetics Panel of the NAS BEAR I Committee (1956): epistolary evidence suggests self-interest may have prompted an exaggeration of radiation risks that led to the adoption of the LNT cancer risk assessment model.

    PubMed

    Calabrese, Edward J

    2014-09-01

    This paper extends a series of historical papers which demonstrated that the linear-no-threshold (LNT) model for cancer risk assessment was founded on ideological-based scientific deceptions by key radiation genetics leaders. Based on an assessment of recently uncovered personal correspondence, it is shown that some members of the United States (US) National Academy of Sciences (NAS) Biological Effects of Atomic Radiation I (BEAR I) Genetics Panel were motivated by self-interest to exaggerate risks to promote their science and personal/professional agenda. Such activities have profound implications for public policy and may have had a significant impact on the adoption of the LNT model for cancer risk assessment. PMID:24993953

  14. Instituto Nacional de Pesquisas Espaciais Exame de admisso para o programa de ps-graduao em Astrofsica

    E-print Network

    - Divisão de Astrofísica Av. dos Astronautas 1758 - Prédio CEA Novo Jardim da Granja - São José dos Campos conseguiria saltar na Lua? #12;2. A taxa de contagem média em um experimento é de 2x103 contagens por segundo positivas e r é a distância ao centro da distribuição. Obtenha o módulo do campo elétrico em função de r

  15. LAPMinistrio da Cincia e Tecnologia -Instituto Nacional de Pesquisas Espaciais -Laboratrio Associado de Plasma Macroscopic instabilities in lightning

    E-print Network

    Associado de Plasma Macroscopic instabilities in lightning 1 2 G.O. Ludwig , M.M.F. Saba 1 2 Laboratório Characteristics of lightning discharges Typically, a lightning stroke lowers negative charge to earth from over a distance of 5km. The first return stroke in a lightning discharge is preceded by a stepped

  16. Escala de Locus de controle ELCO\\/TELEBRÁS

    Microsoft Academic Search

    Luiz Pasquali; Amélia Regina Alves; Maria A. de Mello Pereira

    1998-01-01

    A scale with 28 items, the Organizational Locus of Control (ELCO), was built based on Rotter's theory and Levenson's scale. ELCO was validated on a sample of 350 employees of Telebrás, a governmental firm in Brazil. As foreseen from the theory, a principal-axis factoring showed the presence of the expected two factors, namely internal and external locus of control. The

  17. Adaptação brasileira da Escala de Atitudes Disfuncionais (DAS)

    Microsoft Academic Search

    Mara Rúbia de Camargo; Alves Orsini; Marcelo Tavares; Bartholomeu Tôrres Tróccoli

    2006-01-01

    The Dysfunctional Attitude Scale (DAS) evaluate beliefs and assumptions that may create some cognitive vulnerability to depression. This study examined the consistency; internal structure of the DAS-A and DAS-B and their correlations with the Beck Depression Inventory (BDI). These questionnaires were applied to a sample of two hundred seventy three university students, with ages between 19 and 25 years old

  18. Multiband GaNAsP Quaternary Alloys

    SciTech Connect

    Yu, K.M.; Walukiewicz, W.; Ager III, J.W.; Bour, D.; Farshchi,R.; Dubon, O.D.; Li, S.X.; Sharp, I.D.; Haller, E.E.

    2005-12-08

    We have synthesized GaN{sub x}As{sub 1-y}P{sub y} alloys (x {approx} 0.3-1% and y = 0-0.4) using nitrogen N ion implantation into GaAsP epilayers followed by pulsed laser melting and rapid thermal annealing techniques. As predicted by the band anticrossing model, the incorporation of N splits the conduction band (E{sub M}) of the GaAs{sub 1-y}P{sub y} substrate, and strong optical transitions from the valence band to the lower (E{sub -}) and upper (E{sub +}) conduction subbands are observed. The relative strengths of the E{sub -} and E{sub +} transition change as the localized N level E{sub N} emerges from the conduction band forming narrow intermediate band for y > 0.3. The results show that GaN{sub x}As{sub 1-x-y}P{sub y} alloys with y > 0.3 is a three band semiconductor alloy with potential applications for high-efficiency intermediate band solar cells.

  19. The NAS perchlorate review: Adverse effects?

    SciTech Connect

    Johnston, Richard B.; Corley, Rick A.; Cowan, Linda; Utiger, Robert D.

    2005-11-01

    To the editor: Drs. Ginsberg and Rice argue that the reference dose for perchlorate of 0.0007 mg/kg per day recommended by the National Academies’ Committee to Assess the Health Implications of Perchlorate Ingestion is not adequately protective. As members of the committee, we disagree. Ginsberg and Rice base their conclusion on three points. The first involves the designation of the point of departure as a NOEL (no-observed-effect level) versus a LOAEL (lowest-observed-adverse- effect level). The committee chose as its point of departure a dose of perchlorate (0.007 mg/kg per day) that when given for 14 days to 7 normal subjects did not cause a significant decrease in the group mean thyroid iodide uptake (Greer et al. 2002). Accordingly, the committee considered it a NOEL. Ginsberg and Rice focus on the fact that only 7 subjects were given that dose, and they 1seem to say that attention should be paid only to the results in those subjects in whom there was a 1fall in thyroid iodide uptake, and that the results in those in whom there was no fall or an increase should be ignored. They consider the dose to be a LOAEL because of the fall in uptake in those few subjects. It is important to note that a statistically significant decrease of, for example, 5% or even 10%, would not be biologically important and, more important, would not be sustained. For example, in another study (Braverman et al. 2004), administration of 0.04 mg/kg per day to normal subjects for 6 months had no effect on thyroid iodide uptake when measured at 3 and 6 months, and no effect on serum thyroid hormone or thyrotropin concentrations measured monthly (inspection of Figure 5A in the paper by Greer et al. suggests that this dose would inhibit thyroid iodide uptake by about 25% if measured at 2 weeks). The second issue involves database uncertainty. In clinical studies, perchlorate has been administered prospectively to 68 normal subjects for 2 weeks to 6 months. In one study (Brabant et al. 1992), a dose of 9.2 mg/kg per day for 4 weeks had no effect on thyroid function. In occupational studies, doses as high as 0.5 mg/kg per day were not associated with adverse effects on thyroid function in workers. In epidemiologic studies, there were no abnormalities in growth or thyroid function in children exposed life-long to 100 to 120 mg of perchlorate per liter of drinking water, or in pregnant women and newborn infants similarly exposed. Given the choice of a non-adverse effect (inhibition of iodide uptake by the thyroid) as the point of departure and the multiple studies in which doses of perchlorate much larger than 0.007 mg/kg per day had no effect on any aspect of thyroid function, the committee did not apply a database uncertainty factor. Finally, Ginsberg and Rice argue that inhibition of thyroid iodide uptake is adverse. That conclusion assumes that any acute inhibition would be sustained, so that thyroid hormone production would fall. That is not the case. There is remarkable compensation for even substantial reductions in thyroid iodide uptake – and thyroid hormone production. As noted above, subjects given 0.04 mg/kg per day for 6 months and 9.2 mg/kg per day for 4 weeks?doses that certainly would inhibit thyroid iodide uptake for a few weeks?had no fall in serum thyroid hormone or rise in serum thyrotropin concentrations (the hallmark of even minor systemic thyroid deficiency). Short-term inhibition of thyroid iodide uptake is not an adverse effect; it has no adverse consequences, because there is rapid compensation mediated by several independent processes. One is upregulation of the thyroid sodium-iodide transport system, as a result of intrathyroidal iodide deficiency. The second, should there be even a very small fall in thyroid hormone production, is an increase in thyrotropin secretion, resulting in overall stimulation of the thyroid gland.

  20. Biologia molecular nas doenças do neurônio motor

    Microsoft Academic Search

    Edmar Zanoteli; Ana Beatriz; Alvarêz Peres; Acary Souza; Bulle Oliveira; Alberto Alain Gabbai

    SUMMARY The motor neuron diseases are a group of diseases characterized by upper motor neuron, lower motor neuron or both involvement. The most common form of motor neuron disease in the infancy is the spinal muscular atrophy associated with mutations on SMN gene in more than 90% of cases. In adult patients less than 15% of cases are familial. In

  1. Ecological risk assessment framework -- the NAS perspective

    SciTech Connect

    Barnthouse, L.W.

    1993-06-01

    A Workshop on Ecological Risk Assessment was held on February 26--March 1, 1991, at Airlie House, Warrenton, Virginia. In addition to presentation and discussion of the case study papers, the workshop included breakout sessions to discuss conceptual and technical aspects of ecological risk assessment. A general consensus emerged that an ecological version of the 1983 framework is desirable and feasible. The committee concluded that the 1983 human health framework could be expanded to accomodate both human health and ecological risk assessment. For general applicability to ecological assessments, the 1983 scheme requires augmentation to address some of the interfaces between science and management, primarily because of the need to focus on appropriate questions relevant to applicable environmental law and policy under different circumstances. Specifically, the scheme needs modification to address (1) the influence of legal and regulatory considerations on the initial stages of ecological risk assessment and (2) the importance of characterizing ecological risks in terms that are intelligible to risk managers. The committee`s opinion is that these augmentations are as important for human health risk assessment as they are for ecological risk assessment. This paper briefly describes the framework recommended by the Committee and compares it to EPA`s recently-published Framework for Ecological Risk Assessment.

  2. Response to Questions on Presentation to NAS

    SciTech Connect

    Meier, W R

    2011-03-17

    Response to questions on the presentation 'Overview to Chamber and Power Plant Designs for IFE' made at the 1/29-31 meeting of the National Academies Committee on the Prospects for Inertial Confinement Fusion Energy Systems.

  3. NAS Report Reveals Dangers From SST

    ERIC Educational Resources Information Center

    Fowler, Jo Ann V.

    1973-01-01

    Reported are some harmful effects of supersonic travel on humans and other living organisms. Slight decreases in ozone concentration as a result of emissions from the SST aircrafts reduce absorption of ultraviolet radiation. Effects of this may include skin cancer, distort balance of activity in cells and have a deleterious effect on insects and…

  4. Strategic Plans for the Future of Solar Physics: a community discussion of the NASA Sun-Earth Connection Program Roadmap and the NAS Decadal Survey of Astronomy and Astrophysics (Solar Astronomy section)

    NASA Astrophysics Data System (ADS)

    Schrijver, K.; Knoelker, M.

    1999-05-01

    The NASA Sun-Earth Connections Program is currently revising its Roadmap, the long-range plan for science goals, technology development, and missions between 2000 and 2040. From the interior dynamics of the Sun, to the interactions of plasma, fields, and radiation in the photosphere and solar atmosphere, to the heating and structure of the corona, to the acceleration, structure, and evolution of the solar wind, to the interactions of the heliosphere with the interstellar medium, to the processes of solar, stellar, and solar system evolution - progress in each of these domains will help us understand how the Sun impacts our home in space. The Roadmap Committee is seeking to refine and extend the SEC's vision and identify the milestone missions for the future. During this session, an outline of the current draft Roadmap will be presented, and further community involvement will be solicited to ensure the strongest possible concensus on the revised Roadmap. The National Academy of Sciences' Space Science Board has appointed a committee to perform a Decadal Survey of Astronomy and Astrophysics, which is surveying the field of space- and ground-based astronomy and astrophysics, recommending priorities for the most important new initiatives of the decade 2000-2010. The prioritization delivered by the earlier Decadal Surveys has played an important role in guiding the funding agencies in setting their priorities for astronomy and astrophysics. Therefore it will be of crucial importance for solar physics to contribute a strong case for its own set of future projects to be incorpoprated into the survey. The solar physics of the next decade will be characterized by its increasing societal relevance in the context of the National Space Weather Program and related issues, as well as its classical importance as a ``base" for many astrophysical questions. The presentation and subsequent discussion at the Chicago meeting is intended to solicit further community input, to achieve optimal representation for solar physics in the Decadal Survey. The Roadmap Committee and the Decadal Survey's solar panel encourage the whole solar physics community to contact them prior to the meeting. The list of the committee/panel members and their e-mail addresses, as well as related information, can be accessed via their websites at http://www.lmsal.com/sec/ and http://www.nas.edu/bpa/projects/astrosurvey/solar/ , respectively.

  5. Comparison of leading parallel NAS file systems on commodity hardware

    SciTech Connect

    Hedges, R; Fitzgerald, K; Gary, M; Stearman, D M

    2010-11-08

    High performance computing has experienced tremendous gains in system performance over the past 20 years. Unfortunately other system capabilities, such as file I/O, have not grown commensurately. In this activity, we present the results of our tests of two leading file systems (GPFS and Lustre) on the same physical hardware. This hardware is the standard commodity storage solution in use at LLNL and, while much smaller in size, is intended to enable us to learn about differences between the two systems in terms of performance, ease of use and resilience. This work represents the first hardware consistent study of the two leading file systems that the authors are aware of.

  6. UAS Integration in the NAS Project and Future Autonomy Research

    NASA Technical Reports Server (NTRS)

    Johnson, Charles W.

    2014-01-01

    This presentation highlights NASA use of unmanned aircraft systems (UAS) and related technologies for civil purposes. This briefing will give more insight into the UAS projects progress and future goals.

  7. Band Anticrossing in GaInNAs Alloys

    Microsoft Academic Search

    W. Shan; W. Walukiewicz; J. W. Ager III; E. E. Haller; J. F. Geisz; D. J. Friedman; J. M. Olson; S. R. Kurtz

    1999-01-01

    We present evidence for a strong interaction between the conduction band and a narrow resonant band formed by nitrogen states in Ga 1-xIn xN yAs 1-y alloys. The interaction leads to a splitting of the conduction band into two subbands and a reduction of the fundamental band gap. An anticrossing of the extended states of the conduction band of the

  8. Science Policy: Former NAS Official Reviews World Science.

    ERIC Educational Resources Information Center

    Malone, Thomas F.

    1982-01-01

    Issues discussed with Thomas F. Malone (former Foreign Secretary-National Academy of Sciences) include: scientists role in dealing with such global problems as nuclear war and needs in developing countries; scientific relations with China/Soviet Union; scientific enterprise/human rights; science/technology role in foreign policy; and political…

  9. PM - EMISSION CHARACTERIZATION, FACTORS AND CONTROLS (NAS 12)

    EPA Science Inventory

    The program will focus on diesel trucks, prescribed and open burning, construction sites and residential wood combustion. Differences in emission rates due to changes in operating conditions and fuel type will be included in the revised factors. Ammonia research will produce i...

  10. PM HAZARDOUS COMPONENTS, MECHANISMS, & DOSIMETRY (NAS 5,6, & 9)

    EPA Science Inventory

    The goals of this research are to evaluate the physical and chemical characteristics of fine PM from combustion sources and, most importantly, to understand the characteristics and formation mechanisms which influence particle toxicity. EPA will determine how chemical and physi...

  11. Job Management Requirements for NAS Parallel Systems and Clusters

    NASA Technical Reports Server (NTRS)

    Saphir, William; Tanner, Leigh Ann; Traversat, Bernard

    1995-01-01

    A job management system is a critical component of a production supercomputing environment, permitting oversubscribed resources to be shared fairly and efficiently. Job management systems that were originally designed for traditional vector supercomputers are not appropriate for the distributed-memory parallel supercomputers that are becoming increasingly important in the high performance computing industry. Newer job management systems offer new functionality but do not solve fundamental problems. We address some of the main issues in resource allocation and job scheduling we have encountered on two parallel computers - a 160-node IBM SP2 and a cluster of 20 high performance workstations located at the Numerical Aerodynamic Simulation facility. We describe the requirements for resource allocation and job management that are necessary to provide a production supercomputing environment on these machines, prioritizing according to difficulty and importance, and advocating a return to fundamental issues.

  12. NAS 301 Syllabus I. ASCRC General Education Form

    E-print Network

    Vonessen, Nikolaus

    Dept/Program Native American Studies Course # 301 Course Title Native American Religion and Philosophy to understand ways in which world view and spirituality shape (and have shaped) the Native American world of Indigenous religious practice and the impact of Western cultures on Native American religions, philosophies

  13. SITE TECHNOLOGY CAPSULE: NOVOCS EVALUATION AT NAS NORTH ISLAND

    EPA Science Inventory

    This is a SITE Technology Capsule. The MACTEC, Inc. (MACTEC), NoVOCs(TM) in-well volatile organic compounds (VOC) stripping technology is an in-situ groundwater remediation technology designed for the cleanup of groundwater contaminated with VOCs. The NoVOCs(TM) technology was ev...

  14. Science and Decisions: Advancing Risk Assessment (NAS Final Report)

    EPA Science Inventory

    In August 2009, the Committee on Improving Risk Analysis Approaches Used by the U.S. EPA, National Research Council released a final report, requested and sponsored by the EPA, entitled Science and Decisions: Advancing Risk Assessment 2009....

  15. NAS Associate Works on Environmental Implications of Nanoparticles

    EPA Science Inventory

    Dr. Manomita Patra joined the EPA's, Human Exposure and Atmospheric Sciences Division at the Las Vegas, NV location in June 2007. Her research project parallels her previous interests in the genotoxicity of mercury in plants. She is working with Dr. Kim Rogers and Tammy Jones-Lep...

  16. Feasibility study for a secondary Na/S battery

    NASA Technical Reports Server (NTRS)

    Abraham, K. M.; Schiff, R.; Brummer, S. B.

    1979-01-01

    The feasibility of a moderate temperature Na battery was studied. This battery is to operate at a temperature in the range of 100-150 C. Two kinds of cathode were investigated: (1) a soluble S cathode consisting of a solution of Na2Sn in an organic solvent and (2) an insoluble S cathode consisting of a transition metal dichalcogenide in contact with a Na(+)ion conducting electrolyte. Four amide solvents, dimethyl acetamide, diethyl acetamide, N-methyl acetamide and acetamide, were investigated as possible solvents for the soluble S cathode. Results of stability and electrochemical studies using these solvents are presented. The dialkyl substituted amides were found to be superior. Although the alcohol 1,3-cyclohexanediol was found to be stable in the presence of Na2Sn at 130 C, its Na2Sn solutions did not appear to have suitable electrochemical properties.

  17. Os encontros A Matemtica nas CinciasA Matemtica nas CinciasA Matemtica nas CinciasA Matemtica nas Cincias BiolgicasBiolgicasBiolgicasBiolgicas tm por objectivo divulgar o

    E-print Network

    Lisboa, Universidade Técnica de

    rega Graça Gonçalves Faculdade de Ciências e Tecnologia Gestão da paisagem florestal: modelos de na investigação médica Luzia Gonçalves Instituto de Higiene e Medicina Tropical DiscussãoGraça Gonçalves|Faculdade de Ciências e Tecnologia Sendo a escassez dos recursos hídricos cada vez mais uma

  18. TRANSFORMING THE NAS: THE NEXT GENERATION AIR TRAFFIC CONTROL SYSTEM

    Microsoft Academic Search

    Heinz Erzberger

    The next-generation air-traffic control system will have to be able to handle, safely and efficiently, a traffic density that will be two or three times that accommodated by the present system. Capacity of the en route and transition (arrival\\/departure) airspace of the present system is principally limited by the controller workload associated with monitoring and controlling aircraft separation. Therefore, the

  19. MINISTRIO DA CINCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS

    E-print Network

    Domingues, Margarete Oliveira

    i MINISTÉRIO DA CIÊNCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS RELATÓRIO DE GESTÃO DO INPE ANO 2001 Unidade Gestora NATAL - RN #12;ii MINISTÉRIO DA CIÊNCIA E TECNOLOGIA INSTITUTO E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS CENTRO REGIONAL

  20. Presentación de una Escala de Satisfacción con los Servicios Sanitarios de Atención Primaria

    Microsoft Academic Search

    Jesús Varela Mallou; Antonio Rial Boubeta; Eduardo García Cueto

    Presentation of a satisfaction scale with Primary Health Care Services. To obtain a reliable and valid measure of the users satisfaction with a service is one of the main concerns to the mangers. In the ca- se of health services is proved that patient satisfaction affects to treatment adherence and clinical out- comes. In this study, from a survey of

  1. Validación de escala de la seguridad alimentaria doméstica en Antioquia, Colombia

    Microsoft Academic Search

    Marta Cecilia Álvarez; Alejandro Estrada; Elizabeth Cristina Montoya; Hugo Melgar-Quiñónez

    2006-01-01

    Objective. To adapt and validate in households of Antio- quia, Colombia, a food security scale previously applied in households of Caracas, Venezuela. Material and Methods. The study was carried out in 44 municipalities in the depar- tment of Antioquia, Colombia, in 2003 and 2004, with a ran- domly selected sample of 1 624 rural and urban households with children under

  2. I. H. Tan1, M. Ueda1, R. S. Dallaqua1, J. O. Rossi1, A. F. Beloto2 Instituto Nacional de Pesquisas Espaciais 1Laboratrio Associado de Plasma

    E-print Network

    implantation 200 � aluminum film deposited by electron beam on a Kapton sample (8.5cm�12cm) wound around sample, inflatable mirrors & lenses, solar sails... International Space Station orbiting LEO region (450 km in 60µs In metal plasmas generated by vacuum arcs: Magnetic field increases plasma density by two orders

  3. Astronomia Motivadora no Ensino Fundamental

    NASA Astrophysics Data System (ADS)

    Melo, J.; Voelzke, M. R.

    2008-09-01

    O objetivo principal deste trabalho é procurar desenvolver o interesse dos alunos pelas ciências através da Astronomia. Uma pesquisa com perguntas sobre Astronomia foi realizada junto a 161 alunos do Ensino Fundamental, com o intuito de descobrir conhecimentos prévios dos alunos sobre o assunto. Constatou-se, por exemplo, que 29,3% da 6ª série responderam corretamente o que é eclipse, 30,0% da 8ª série acertaram o que a Astronomia estuda, enquanto 42,3% dos alunos da 5ª série souberam definir o Sol. Pretende-se ampliar as turmas participantes e trabalhar, principalmente de forma prática com: dimensões e escalas no Sistema Solar, construção de luneta, questões como dia e noite, estações do ano e eclipses. Busca-se abordar, também, outros conteúdos de Física tais como a óptica na construção da luneta, e a mecânica no trabalho com escalas e medidas, e ao utilizar uma luminária para representar o Sol na questão do eclipse, e de outras disciplinas como a Matemática na transformação de unidades, regras de três; Artes na modelagem ou desenho dos planetas; a própria História com relação à busca pela origem do universo, e a Informática que possibilita a busca mais rápida por informações, além de permitir simulações e visualizações de imagens importantes. Acredita-se que a Astronomia é importante no processo ensino aprendizagem, pois permite a discussão de temas curiosos como, por exemplo, a origem do universo, viagens espaciais a existência ou não de vida em outros planetas, além de temas atuais como as novas tecnologias.

  4. PROPUESTA DE UNA ESCALA DE MEDIDA DE LA GESTIÓN DEL CONOCIMIENTO EN LAS INDUSTRIAS DE BIOTECNOLOGÍA Y TELECOMUNICACIONES

    Microsoft Academic Search

    Palacios Marqués; D. Garrigós Simón

    2006-01-01

    This research specifies how to build and validate a Knowledge Management measurement scale. The process is based on Churchill (1979) and Devellis (1991) methodologies. The empirical study carried out in 222 Spanish firms from the Biotechnology and Telecommunications industries. As a result we obtain a KM measurement scale with all the sociometric properties which demand the development of measurement scales

  5. Análisis factorial exploratorio y propiedades psicométricas de la escala de valencia de actitudes y creencias hacia la hipnosis, versión terapeuta

    Microsoft Academic Search

    Antonio Capafons; Claudia Morales; Begoña Espejo; Sonia Cabañas

    2006-01-01

    Exploratory factor analysis and psychometric properties of the valencia scale on attitudes and beliefs toward hypnosis. Therapist version. This investigation examines the psychometric properties and fac - tor structure of the Valencia Scale on Attitudes and Beliefs toward Hypnosis-Therapist version. Data from 775 professional psychologists belonging to the Spanish Association of Psychologists were used for the exploratory factor analysis (EFA).

  6. Análisis de las economías de escala y alcance en los servicios de acueducto y alcantarillado en Colombia

    Microsoft Academic Search

    Daniel Revollo; Giovanna Londoño

    2010-01-01

    Una de las principales características del sector de acueducto y alcantarillado en Colombia es el alto nivel de atomización en la prestación de tales servicios. Este nivel es el resultado de los procesos de descentralización de fines de la década de los ochenta y los cambios implementados en los noventa, que modificaron el esquema de prestación al pasar de un

  7. S2 | JUly 2012 STATE OF THE CLIMATE

    E-print Network

    Camargo, Suzana J.

    ), Instituto Nacional de Pesquisas Espaciais (INPE), Cachoeira Paulista, Sao Paulo, Brazil Amador, Jorge A, United Kingdom Berry, David I., National Oceanography Centre, Southampton, United Kingdom Beszc

  8. J. Blunden, D. S. Arndt, and M. O. Baringer, Eds. Associate Eds. H. J. Diamond, A. J. Dolman, R. L. Fogt, B. D. Hall, M. Jeffries, J. M. Levy,

    E-print Network

    Howat, Ian M.

    , Lincoln, CPTEC/Instituto Nacional de Pesquisas Espaciais (INPE), São Paulo, Brazil Amador, Jorge A, Reading, United Kingdom Berry, David I., National Oceanography Centre, Southampton, United Kingdom

  9. Today's National Airspace System (NAS) consists of a complex collection of facilities, systems, equipment,

    E-print Network

    Sun, Dengfeng

    . · More than 18,000 airports capable of accommo- dating an array of aircraft operations, many of which, field maintenance, certification, systems acquisi- tions, and a variety of other services are air carrier, 27 percent air taxi, 33 percent general aviation, and 4 percent military. · Approximately

  10. Analysis of Well-Clear Boundary Models for the Integration of UAS in the NAS

    NASA Technical Reports Server (NTRS)

    Upchurch, Jason M.; Munoz, Cesar A.; Narkawicz, Anthony J.; Chamberlain, James P.; Consiglio, Maria C.

    2014-01-01

    The FAA-sponsored Sense and Avoid Workshop for Unmanned Aircraft Systems (UAS) defnes the concept of sense and avoid for remote pilots as "the capability of a UAS to remain well clear from and avoid collisions with other airborne traffic." Hence, a rigorous definition of well clear is fundamental to any separation assurance concept for the integration of UAS into civil airspace. This paper presents a family of well-clear boundary models based on the TCAS II Resolution Advisory logic. Analytical techniques are used to study the properties and relationships satisfied by the models. Some of these properties are numerically quantifed using statistical methods.

  11. BOREAS TE-9 In Situ Diurnal Gas Exchange of NAS Boreal Forest Stands

    NASA Technical Reports Server (NTRS)

    Hall, Forrest G. (Editor); Curd, Shelaine (Editor); Margolis, Hank; Coyea, Marie; Dang, Qinglai

    2000-01-01

    The BOREAS TE-9 team collected several data sets related to chemical and photosynthetic properties of leaves in boreal forest tree species. The purpose of the BOREAS TE-09 study was threefold: 1) to provide in situ gas exchange data that will be used to validate models of photosynthetic responses to light, temperature, and carbon dioxide (CO2); 2) to compare the photosynthetic responses of different tree crown levels (upper and lower); and 3) to characterize the diurnal water potential curves for these sites to get an indication of the extent to which soil moisture supply to leaves might be limiting photosynthesis. The gas exchange data of the BOREAS NSA were collected to characterize diurnal gas exchange and water potential of two canopy levels of five boreal canopy cover types: young jack pine, old jack pine, old aspen, lowland old black spruce, and upland black spruce. These data were collected between 27-May-1994 and 17-Sep-1994. The data are provided in tabular ASCII files. The data files are available on a CD-ROM (see document number 20010000884), or from the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).

  12. Sense and avoid modeling and simulation for UAS operations in the NAS

    Microsoft Academic Search

    Shawn Hanegan; Kyle Noth

    2012-01-01

    Presents a collection of slides from the author's conference presentation is given. Topics covered include: Sense and Avoid Overview; Research Objectives; Modeling and Simulation (made up of sections on Radar and Tracking System Modeling, Simulation Approach, Results (Edwards AFB), and Conclusions); and finally Next Steps.

  13. An Integrated Approach to Evaluating Risk Mitigation Measures for UAV Operational Concepts in the NAS

    E-print Network

    Weibel, Roland E

    2005-09-26

    An integrated approach is outlined in this paper to evaluate risks posed by operating Unmanned Aerial Vehicles in the National Airspace System. The approach supports the systematic evaluation of potential risk mitigation ...

  14. A Validation Study of Merging and Spacing Techniques in a NAS-Wide Simulation

    NASA Technical Reports Server (NTRS)

    Glaab, Patricia C.

    2011-01-01

    In November 2010, Intelligent Automation, Inc. (IAI) delivered an M&S software tool to that allows system level studies of the complex terminal airspace with the ACES simulation. The software was evaluated against current day arrivals in the Atlanta TRACON using Atlanta's Hartsfield-Jackson International Airport (KATL) arrival schedules. Results of this validation effort are presented describing data sets, traffic flow assumptions and techniques, and arrival rate comparisons between reported landings at Atlanta versus simulated arrivals using the same traffic sets in ACES equipped with M&S. Initial results showed the simulated system capacity to be significantly below arrival capacity seen at KATL. Data was gathered for Atlanta using commercial airport and flight tracking websites (like FlightAware.com), and analyzed to insure compatible techniques were used for result reporting and comparison. TFM operators for Atlanta were consulted for tuning final simulation parameters and for guidance in flow management techniques during high volume operations. Using these modified parameters and incorporating TFM guidance for efficiencies in flowing aircraft, arrival capacity for KATL was matched for the simulation. Following this validation effort, a sensitivity study was conducted to measure the impact of variations in system parameters on the Atlanta airport arrival capacity.

  15. Picosecond carrier lifetimes in dilute GaInNAs grown on InP substrate

    SciTech Connect

    Mangeney, J.; Laurent, T.; Martin, M. [Institut d'Electronique Fondamentale, Univ. Paris-Sud, UMR 8622 CNRS, Orsay 91405 (France); Harmand, J. C.; Travers, L.; Mauguin, O. [CNRS/LPN, Laboratoire de Photonique et de Nanostructures, Marcoussis 91460 (France)

    2011-10-03

    We study the carrier relaxation dynamics in Ga{sub 1-y}In{sub y} N{sub 0.03}As{sub 0.97} layers grown on InP substrate by molecular beam epitaxy. This dilute nitride semiconductor is a potential candidate for ultrafast components such as photoconductive terahertz devices driven at 1.55 {mu}m wavelength. Carrier lifetimes are measured by pump-probe experiments at 1550 nm wavelength and the shortest carrier lifetime is 2.6 ps under photoexcitation with {approx}4.2 {mu}J/cm{sup 2}. We observe two contributions in the differential transmittance decay. These contributions are discussed in terms of photocarrier recombination processes.

  16. Materials reliability. Technical activities, 1990. (NAS-NRC Assessment Panel, January 31February 1, 1991)

    Microsoft Academic Search

    McHenry

    1990-01-01

    Selected Highlights of the Materials Reliability Division are as follows: Composites NDE: A high resolution ultrasonic system has been developed for inspecting thick polymer-matrix composites; NDE Instruments: Field trials were conducted on two prototype ultrasonic NDE instruments. A formability sensor system was delivered to the Ford Motor Company for evaluation at their Dearborn stamping plant. An ultrasonic system for roll-by

  17. Cdigo de tica nas empresas pode evitar o assdio Por Claudia Brum Moth

    E-print Network

    Floeter, Sergio Ricardo

    , a partir da Revolução Industrial. Posteriormente, com o início da 1ª Guerra Mundial, as medidas protetivas -- Organização Mundial de Saúde, no ano 2.000, revela que as perspectivas para os próximos vinte anos são muito a instabilidade da economia mundial, enquanto que a competição da sociedade capitalista em que vivemos torna

  18. Kommentare NAS 1: 35 830 American Youth Culture in the 20th and 21st Centuries

    E-print Network

    Schubart, Christoph

    interpretations of youth culture as naïve/advanced, violent/passive, emotional, outofcontrolRoll, Grudge and Dance music of the 1990s, the incidents at Columbine and Virginia Tech, and the Duke Flist. Course methodology will include an examination of films, articles, music, social interface media, etc

  19. Why Equity is a Pipedream: Analysis of the Dynamics of Overscheduled NAS Resources

    E-print Network

    , Congressional policies, and modernization plans call for equitable allocation of publicly held resources with the dynamic allocation of an overscheduled resource. The mathematical model demonstrates that (i) a natural increase the capacity and productivity of the air transportation system through a process of modernization

  20. Minority carrier transport properties of GaInNAs heterojunction bipolar transistors with 2% nitrogen

    E-print Network

    Asbeck, Peter M.

    % nitrogen Rebecca J. Welty,a) Huoping Xin, Charles W. Tu, and Peter M. Asbeck University of California) of 0.98 eV; this is achieved with a nitrogen composition of 2%. These devices have a turn-on voltage HFE is 8. The current gain of nitrogen containing HBTs is degraded due to the complex change

  1. Preliminary C3 Loading Analysis for Future High-Altitude Unmanned Aircraft in the NAS

    NASA Technical Reports Server (NTRS)

    Ho, Yan-Shek; Gheorghisor, Izabela; Box, Frank

    2006-01-01

    This document provides a preliminary assessment and summary of the command, control, and communications (C(sup 3)) loading requirements of a generic future high-altitude, long-endurance unmanned aircraft (UA) operating at in the National Airspace System. Two principal types of C(sup 3) traffic are considered in our analysis: communications links providing air traffic services (ATS) to the UA and its human pilot, and the command and control data links enabling the pilot to operate the UA remotely. we have quantified the loading requirements of both types of traffic for two different assumed levels of UA autonomy. Our results indicate that the potential use of UA-borne relays for the ATS links, and the degree of autonomy exercised by the UA during the departure and arrival phases of its flight, will be among the key drivers of C(sup 3) loading and bandwidth requirements.

  2. UAS Integration into the NAS: HSI Full Mission Simulation Preliminary Results

    NASA Technical Reports Server (NTRS)

    Shively, Jay; Fern, Lisa; Rorie, Conrad

    2014-01-01

    The goal of the Full Mission Sim was to examine the effects of different command and control interfaces on UAS pilots' ability to respond to ATC commands and traffic advisories. Results suggest that higher levels of automation (i.e., waypoint-to-waypoint control interfaces) lead to longer initial response times and longer edit times. The findings demonstrate the importance of providing pilots with interfaces that facilitate their ability to get back "in the loop."

  3. A Family of Well-Clear Boundary Models for the Integration of UAS in the NAS

    NASA Technical Reports Server (NTRS)

    Munoz, Cesar A.; Narkawicz, Anthony; Chamberlain, James; Consiglio, Maria; Upchurch, Jason

    2014-01-01

    The FAA-sponsored Sense and Avoid Workshop for Unmanned Aircraft Systems (UAS) defines the concept of sense and avoid for remote pilots as "the capability of a UAS to remain well clear from and avoid collisions with other airborne traffic." Hence, a rigorous definition of well clear is fundamental to any separation assurance concept for the integration of UAS into civil airspace. This paper presents a family of well-clear boundary models based on the TCAS II Resolution Advisory logic. For these models, algorithms that predict well-clear violations along aircraft current trajectories are provided. These algorithms are analogous to conflict detection algorithms but instead of predicting loss of separation, they predict whether well-clear violations will occur during a given lookahead time interval. Analytical techniques are used to study the properties and relationships satisfied by the models.

  4. 48 CFR 852.236-83 - Payments under fixed-price construction contracts (including NAS).

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Regulations System DEPARTMENT OF VETERANS AFFAIRS CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Texts of Provisions...title, nondiscrimination compliance reports, or any other things required by this contract, have been submitted to the...

  5. 48 CFR 852.236-83 - Payments under fixed-price construction contracts (including NAS).

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Regulations System DEPARTMENT OF VETERANS AFFAIRS CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Texts of Provisions...title, nondiscrimination compliance reports, or any other things required by this contract, have been submitted to the...

  6. 48 CFR 852.236-83 - Payments under fixed-price construction contracts (including NAS).

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Regulations System DEPARTMENT OF VETERANS AFFAIRS CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Texts of Provisions...title, nondiscrimination compliance reports, or any other things required by this contract, have been submitted to the...

  7. 48 CFR 852.236-83 - Payments under fixed-price construction contracts (including NAS).

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Regulations System DEPARTMENT OF VETERANS AFFAIRS CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Texts of Provisions...title, nondiscrimination compliance reports, or any other things required by this contract, have been submitted to the...

  8. 48 CFR 852.236-82 - Payments under fixed-price construction contracts (without NAS).

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Regulations System DEPARTMENT OF VETERANS AFFAIRS CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Texts of Provisions...title, nondiscrimination compliance reports, or any other things required by this contract, have been submitted to the...

  9. 48 CFR 852.236-82 - Payments under fixed-price construction contracts (without NAS).

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Regulations System DEPARTMENT OF VETERANS AFFAIRS CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Texts of Provisions...title, nondiscrimination compliance reports, or any other things required by this contract, have been submitted to the...

  10. 48 CFR 852.236-82 - Payments under fixed-price construction contracts (without NAS).

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Regulations System DEPARTMENT OF VETERANS AFFAIRS CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Texts of Provisions...title, nondiscrimination compliance reports, or any other things required by this contract, have been submitted to the...

  11. 48 CFR 852.236-82 - Payments under fixed-price construction contracts (without NAS).

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Regulations System DEPARTMENT OF VETERANS AFFAIRS CLAUSES AND FORMS SOLICITATION PROVISIONS AND CONTRACT CLAUSES Texts of Provisions...title, nondiscrimination compliance reports, or any other things required by this contract, have been submitted to the...

  12. The Washington Alphabet Circa 1895-1905: NAS, USGS, SI, WAS, CC, GWMA, WMI, CIW

    Microsoft Academic Search

    E. L. Yochelson

    2002-01-01

    Pursuit of science as part of the Federal responsibility to the American public was vigorously defended by John Wesley Powell in the 1880s, but received serious financial setback during the next decade. The following decade saw the gradual laying of foundations for the present-day non-academic component of \\

  13. The Washington Alphabet Circa 1895-1905: NAS, USGS, SI, WAS, CC, GWMA, WMI, CIW

    NASA Astrophysics Data System (ADS)

    Yochelson, E. L.

    2002-05-01

    Pursuit of science as part of the Federal responsibility to the American public was vigorously defended by John Wesley Powell in the 1880s, but received serious financial setback during the next decade. The following decade saw the gradual laying of foundations for the present-day non-academic component of "big science" through the development of a series of Federal and private organizations, some which were ephemeral. A key person in this alphabet soup has the initials CDW (Charles Doolittle Walcott). His influence will be discussed and if time permits, BM, NACA and NRC will be used to demonstrate methodology.

  14. Razão e emoção: uma leitura analítico-comportamental de avanços recentes nas neurociências

    Microsoft Academic Search

    Rosângela Araújo Darwich

    2005-01-01

    Reason and emotion: a behavior-analytic interpretation of recent advances in neurosciences. Recent findings of the neurosciences present an integrated view of the human functioning, one that encompasses the relationships among the great organic systems, between physiological and cognitive states and between reason and emotion. The aim of this paper is to contrast such studies with central aspects of the Skinnerian

  15. Evaluation of the Terminal Precision Scheduling and Spacing System for Near-Term NAS Application

    NASA Technical Reports Server (NTRS)

    Thipphavong, Jane; Martin, Lynne Hazel; Swenson, Harry N.; Lin, Paul; Nguyen, Jimmy

    2012-01-01

    NASA has developed a capability for terminal area precision scheduling and spacing (TAPSS) to provide higher capacity and more efficiently manage arrivals during peak demand periods. This advanced technology is NASA's vision for the NextGen terminal metering capability. A set of human-in-the-loop experiments was conducted to evaluate the performance of the TAPSS system for near-term implementation. The experiments evaluated the TAPSS system under the current terminal routing infrastructure to validate operational feasibility. A second goal of the study was to measure the benefit of the Center and TRACON advisory tools to help prioritize the requirements for controller radar display enhancements. Simulation results indicate that using the TAPSS system provides benefits under current operations, supporting a 10% increase in airport throughput. Enhancements to Center decision support tools had limited impact on improving the efficiency of terminal operations, but did provide more fuel-efficient advisories to achieve scheduling conformance within 20 seconds. The TRACON controller decision support tools were found to provide the most benefit, by improving the precision in schedule conformance to within 20 seconds, reducing the number of arrivals having lateral path deviations by 50% and lowering subjective controller workload. Overall, the TAPSS system was found to successfully develop an achievable terminal arrival metering plan that was sustainable under heavy traffic demand levels and reduce the complexity of terminal operations when coupled with the use of the terminal controller advisory tools.

  16. QUESTÕES EPISTEMOLÓGICAS NAS ICONICIDADADES DE REPRESENTAÇÕES VISUAIS EM LIVROS DIDÁTICOS DE FÍSICA

    Microsoft Academic Search

    Alexandre Medeiros; Cleide Medeiros

    Abstract This article analyses a certain kind of philosophical message about the nature of science, tacitally conveyed by some visual represention presented by textbooks of physics. However, our purpose is not ,strictly to analyse ,all the existing visual representation in textbooks ,in all their characteristics, but only to point out a certain kind of usage of those representation which conveys

  17. Support of Activities of the NAS in Relation to the Radiation Effects Research Foundation

    SciTech Connect

    Douple, Evan B.

    2006-05-31

    The National Academies (NA) provides support for the activities related to the long-term follow up of the health of the survivors of the atomic bombings of Hiroshima and Nagasaki being conducted by the Radiation Effects Research Foundation (RERF) laboratories in Hiroshima and Nagasaki, Japan. The NA serves as scientific and administrative liaison between the U.S. Department of Energy (DOE) and RERF, and performs tasks in the areas of scientific oversight, information/public interface, fiscal oversight, and personnel management. The project includes recruitment and support of approximately 10 NA employees who work at RERF in Japan. Specific activities are performed consistent with the cooperative agreement’s Statement of Work between DOE and NA and consistent with an Annual Work Plan developed by DOE and NA.

  18. Gordon and Mike's ICT Podcast: NSF, NAS, etc and the SMET Pipeline

    NSDL National Science Digital Library

    Qaissaunee, Michael

    Gordon and Mike's ICT Podcast offers perspectives on the information and communication technologies (ICT) industries from Gordon Snyder and Mike Qaissaunee. In this podcast, Mike and Gordon discuss "Science, Math, Engineering and Technology (SMET) pipeline and work being done by the National Academy of Science and the National Science Foundation." Running time for the show is 16:57.This podcast is available for direct download in mp3 format from the Libsyn site, or click here to subscribe to the whole series in iTunes.

  19. REGRAS E ORDEM DO MERCADO NAS VISÕES DE ADAM SMITH E F. A. HAYEK

    Microsoft Academic Search

    Angela Ganem

    2005-01-01

    The main objective of this article is to recover, from a critical-philosophical point of view, the central importance of the rules to construct an explanation of the market social order in Adam Smith's and F.A. Hayek's perspectives. We start from a point of view that considers a unifying approach of Adam Smith's work giving to the moral rules the status

  20. UAS Integration in the NAS Project Overview: RTCA SC-228 Plenary DAA Working Group 5

    NASA Technical Reports Server (NTRS)

    Randall, Debra K.

    2014-01-01

    The presentation is intended to allow the public to know and understand NASA's plans for integrated test to allow them the opportunity to provide feedback and suggestions. The integrated testing will support verification and validation of the RTCA SC-228 UAS minimum operation performance standard requirements.

  1. Proceedings of Institute of Mathematics of NAS of Ukraine 2001, Vol. ??, Part ?, 1?? Finitely many symmetries

    E-print Network

    Kamp, Peter H. van der

    symmetries The use of p-adic numbers in calculating symme- tries of evolution equations Peter H. van der Kamp and the Fr´echet derivative is given by the operator DK(v) = i=0 vi K(v)Di #12;Peter H. van der Kamp 3 We

  2. VARIAÇÕES NAS CONCENTRAÇÕES DE MERCÚRIO EM SOLOS DA RESERVA GARIMPEIRA DO ALTO RIO MADEIRA

    Microsoft Academic Search

    M. D. Almeida; L. D. Lacerda; G. C. Saldanha; W. R. Bastos

    2009-01-01

    Mercury use in the gold mining in the Amazon suffered considerable reduction when compared with the decades of 80 and 90. However, Hg levels in fish, and for consequence, in the local human population, continue to be high. One of the possible mechanisms responsible for these high Hg concentrations in fish and humans is the remobilization of Hg due to

  3. Large UAS Operations in the NAS - The NASA 2007 Western States Fire Missions (WSFM)

    NASA Technical Reports Server (NTRS)

    Buoni, Gregory P.; Howell, Kathleen M.

    2008-01-01

    Objectives: Demonstrate capabilities of UAS to overfly and collect sensor data on wildfires throughout Western US. Demonstrate long-endurance mission capabilities (20+ hours). Image multiple fires (greater than 4 fires per mission), to showcase extendable mission configuration and ability to either linger over key fires or station over disparate regional fires. Deliver real-time imagery to (within 10-minutes of acquisition).

  4. Implementation of BT, SP, LU, and FT of NAS Parallel Benchmarks in Java

    NASA Technical Reports Server (NTRS)

    Schultz, Matthew; Frumkin, Michael; Jin, Hao-Qiang; Yan, Jerry

    2000-01-01

    A number of Java features make it an attractive but a debatable choice for High Performance Computing. We have implemented benchmarks working on single structured grid BT,SP,LU and FT in Java. The performance and scalability of the Java code shows that a significant improvement in Java compiler technology and in Java thread implementation are necessary for Java to compete with Fortran in HPC applications.

  5. 48 CFR 852.236-82 - Payments under fixed-price construction contracts (without NAS).

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...236-82 Payments under fixed-price construction contracts (without... Payments Under Fixed-Price Construction Contracts (APR...entitled “Payments Under Fixed-Price Construction Contracts” in...contract requirements. (3) Any level of retention shall...

  6. 48 CFR 852.236-83 - Payments under fixed-price construction contracts (including NAS).

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Payments Under Fixed-Price Construction Contracts (JUL...entitled “Payments Under Fixed-Price Construction Contracts” in...contract requirements. (3) Any level of retention shall not...activities shall equal the contract price. (3) Insurance and...

  7. Impactos do necrochorume nas águas subterrâneas do cemitério de Santa Inês, Espírito Santo, Brasil.8

    Microsoft Academic Search

    Dérika F Neira; Vilma R Terra; Rodrigo Pratte-Santos; Roberto S Barbiéri

    To evaluate the impact of leachate components from aquifer sheets in Santa Inês cemetery by means of analyses of its physical parameters, chemical and microbiological properties of the water from monitoring wells. Proposing adequate methods and standards presented by conservationist measures and laws. Two campaigns were realized in five monitoring wells, in the area of Santa Inês cemetery. These points

  8. Efeito da homeopatia Arnica montana, nas potências centesimais, sobre plantas de artemísia

    Microsoft Academic Search

    L. M. Carvalho; S. P. Lisboa; M. A. Souza

    Effect of homeopathy Arnica montana, centesimal potencies, on plants of artemísia. Forty five days after the transplant to pots, plants of Tanacetum parthenium (L.) Schultz- Bip. gotten from seeds, received homeopathics solutions of Arnica montana, centesimal potencies (CH1, CH2, CH3, CH4 and CH5). The applications, weekly, were done in the same schedule, in the soil, after dilutions in deionized water.

  9. PROCESSO DE TRABALHO DE GERÊNCIA: INSTRUMENTO POTENTE PARA OPERAR MUDANÇAS NAS PRÁTICAS DE SAÚDE?

    Microsoft Academic Search

    Lislaine Aparecida Fracolli; Emiko Yoshikawa Egry

    2001-01-01

    This study analyzes how the management of healthcare services is articulated with the production organization in Basic Health Units by taking as a context the process of implementation of the SILOS technical care model. There is an attempt at operating with analytical instruments which enable the understanding of management work processes in their \\

  10. Multi-agent Simulation of NAS Infrastructure Utilization in the Presence of Airline Policies

    E-print Network

    the safety rules (separation distances). Usually, aircraft wait on the ground until the controllers allow ]. This paper uses a multi-agent-based simulation to model aircraft operations and infrastructure utilization in the presence of airline policies and aircraft route selection strategies. The main hypothesis of the paper

  11. NATIONAL ACADEMY OF SCIENCES (NAS) REVIEW OF THE HEALTH IMPLICATIONS OF PERCHLORATE INGESTION (2005)

    EPA Science Inventory

    In the interest of resolving scientific questions, the EPA, the Department of Defense, the Department of Energy, and the National Aeronautics and Space Administration - members of a broader Interagency Working Group on Perchlorate led by the Office of Science and Technology Polic...

  12. A ROTINA NAS PEDAGOGIAS DA EDUCAÇÃO INFANTIL: dos binarismos à complexidade

    Microsoft Academic Search

    Maria Carmen Silveira Barbosa

    This paper presents a discussion about routines in Early Childhood Education pedagogies. This article was elaborated through bibliographic revision of Early Childhood Education pedagogies and empirical work in nurseries and preschools. The main argument of the article is to replace a discussion of routine that emphasizes an antinomic conception - positivity or negativity - for an understanding of routine within

  13. Transformations of citrate and Tween coated silver nanoparticles reacted with Na?S.

    PubMed

    Baalousha, M; Arkill, K P; Romer, I; Palmer, R E; Lead, J R

    2015-01-01

    Silver nanoparticles (Ag NPs) are susceptible to transformations in environmental and biological media such as aggregation, oxidation, dissolution, chlorination, sulfidation, formation/replacement of surface coatings following interaction with natural organic matter (NOM). This paper investigates the impact of surface coating and Suwannee River fulvic acid (SRFA) on the transformations and behavior of Ag NPs (citrate coated and Tween coated; cit-Ag NPs and Tween-Ag NPs, respectively), following reaction with different concentrations of Na2S solution (as a source of sulfide species, H2S and HS(-)). These transformations and the dominant mechanisms of transformations were investigated using UV-vis and scanning transmission electron microscopy coupled with electron energy loss spectroscopy. Here, we have shown that Ag NP surface coating impacts their dissolution following dilution in ultrahigh purity water, with higher extent of dissolution of Tween-Ag NPs compared with cit-Ag NPs. Tween-Ag NPs are susceptible to dissolution following their sulfidation at low S/Ag molar ratio. Suwannee River fulvic acid (SRFA) slows down the dissolution of Tween-Ag NPs at low sulfide concentrations and reduces the aggregation of cit-Ag NP in the presence of sodium sulfide. Sulfidation appears to occur by direct interaction of sulfide species with Ag NPs rather than by indirect reaction of sulfide with dissolved Ag species subsequent to dissolution. Furthermore, the sulfidation process results in the formation of partially sulfidized Ag NPs containing unreacted (metallic) subgrains at the edge of the NPs for Tween-Ag NPs in the presence of high sulfide concentration (2000nM Na2S), which occurred to less extent at lower Na2S concentration for Tween-Ag NPs and at all concentrations of Na2S for cit-Ag NPs. Thus, sulfidized Ag NPs may preserve some of the properties of the Ag NPs such as their potential to shed Ag(+) ions and their toxic potential of Ag NPs. PMID:25262296

  14. Novo modelo matemtico melhora eficcia nas urgncias 31-10-2006 14:45:00

    E-print Network

    Soares, João Luís Cardoso

    Departamento de Matemática da Faculdade de Ciências e Tecnologia da Universidade de Coimbra, foi publicado este ano na revista científica americana de medicina, "Annals of Emergency Medicine". Trata-se de um modelo

  15. INFLUÊNCIA DOS PROPRIETÁRIOS E\\/OU GESTORES NAS DECISÕES DE FINANCIAMENTO DAS PM E

    Microsoft Academic Search

    Zélia Serrasqueiro

    Recent entrepreneurship research has moved away from perfect capital market assumptions about firm's financing decisions toward recognition of the role of individuals and their interactions in investment decisions. The Small and Medium-Sized Enterpr ises (SMEs) owners' preferences for capital sources may provide a useful basis for understanding the financing practices of small firms. This paper aims to understand the influence

  16. NAS battery demonstration at American Electric Power:a study for the DOE energy storage program.

    SciTech Connect

    Newmiller, Jeff (Endecon Engineering, San Ramon, CA); Norris, Benjamin L. (Norris Energy Consulting Company, Martinez, CA); Peek, Georgianne Huff

    2006-03-01

    The first U.S. demonstration of the NGK sodium/sulfur battery technology was launched in August 2002 when a prototype system was installed at a commercial office building in Gahanna, Ohio. American Electric Power served as the host utility that provided the office space and technical support throughout the project. The system was used to both reduce demand peaks (peak-shaving operation) and to mitigate grid power disturbances (power quality operation) at the demonstration site. This report documents the results of the demonstration, provides an economic analysis of a commercial sodium/sulfur battery energy storage system at a typical site, and describes a side-by-side demonstration of the capabilities of the sodium/sulfur battery system, a lead-acid battery system, and a flywheel-based energy storage system in a power quality application.

  17. Observacoes do Cometa de Halley no Continuo de 22 GHz E 44 GHz, E NA Raia Maser de Vapor de H20 EM 22.2 GHz

    NASA Astrophysics Data System (ADS)

    Abraham, Z.; Scalise, E., Jr.; Botti, L. C. L.; Cancoro, A. C. O.; Monteiro Do Vale, J. L.; del Ciampo, L. F.; Tateyama, C. E.; Vilas Boas, J. W. S.; Homor, J. L.; Kaufmann, P.

    1987-05-01

    0 cometa de Halley foi observado no contínuo nas frequencias de 22 GHz e 44 GHz no Observatório de Itapetinga, Brasil, no período Fevereiro-Abril de 1986. 0 cometa foi detetado em ambas frequ?ncias, apresentando variabilidade corn escalas de tempo de horas. Cálculos teóricos mostram que a radicão não pode ser devida a transicões livre-livre na região ionizada resultante da interacão do cometa corn 0 vento solar. A emissão seria então devida à radiacão térmica dos gráos da coma do cometa, cuja densidade também foi variável em intervalo de horas. Não foi detetada emissão maser de H2O maior que 4 Jy.

  18. VALORES DE LOS ESTUDIANTES DE LA UNIVERSIDAD DE CONCEPCION (CHILE). APLlCACION DE LA ESCALA DE COMPORTAMIENTOS MORALES CONTROVERTlDOSl

    Microsoft Academic Search

    ELENA MATHIESEN; OLGA MORA; MANUEL CASTRO

    1998-01-01

    The Morally Debatable Behaviors Scales (Harding and Phillips, 1986) was applied to a sarnple of 512 University students from Concepcion (Chile). The Scale evaluares three dimensions: sexuality, legality and honorability. The Scale functioning was investigated and high reliability and adequate intemal consistency were found. For tbe case of validity, significant correlations were detected between morality, and religion and gender: male

  19. La Apaicultura de Pequena Escala (Small Scale Beekeeping). Appropriate Technologies for Development. Peace Corps Information Collection & Exchange Manual Series No. M-25.

    ERIC Educational Resources Information Center

    Gentry, Curtis

    This Spanish-language manual is designed to assist Peace Corps volunteers in Spanish-speaking countries in the implementation of small-scale beekeeping programs as a tool for development. Addressed in the individual chapters are bees and humans; project planning; the types and habits of bees; the essence of beekeeping; bee space and beehives;…

  20. El diseño de las redes de riego y las escalas sociales de la producción agrícola en el 1er milenio DC (Tebenquiche Chico, Puna de Atacama)

    Microsoft Academic Search

    MARCOS N. QUESADA

    2006-01-01

    Extensive agricultural fields are frequently linked with processes of political centralization. The assumption is that the expansion of agricultural fields is related to the emergence of an authority with the capacity to mobilize the labor force that is needed for the construction of infrastructure and its management. However, the use of such an indicator can lead us to misunderstand the

  1. Sesso Temtica: Sensoriamento remoto multi-sensor para o estudo de processos oceanogrficos multi-escala (Multi-sensor remote sensing for studying multi-scale oceanographic processes)

    E-print Network

    of the planetary waves field at the global scale in the ocean. Finally, the third talk will focus on the application of ocean remote sensing data, especially the SST, to the study of the ocean-atmosphere interaction processes at the meteorological weather time scale off the coast of Brazil and in the South Atlantic Ocean

  2. ACTUALIZACIÓN DE LA ESCALA DE DEPRESIÓN DEL CENTRO DE ESTUDIOS EPIDEMIOLÓGICOS (CES-D). ESTUDIO PILOTO EN UNA MUESTRA GERIÁTRICA MEXICANA

    Microsoft Academic Search

    Mónica Reyes-Ortega; Ana Laura Soto-Hernández; Jessyka G. Milla-Kegel; Adriana García-Ramírez; Lucía Hubard-Vignau; Lydia A. Mejía-Garza; Ma Carmen García-Peña; Fernando A. Wagner-Echeagaray

    2003-01-01

    SUMMARY Introduction. Depression is one of the leading causes of disease and disability in the world. Yet, most cases of depression are ignored by the community or even at certain levels of the health care system. Thus, medical care is delayed, a fact that has a negative impact on public health and on socioeconomical conditions. In this context, screening instruments

  3. 558: Calculation of Eddy Currents in the ETE Spherical Torus G.O. Ludwig

    E-print Network

    Pesquisas Espaciais, 12227-010 S. J. Campos, SP, Brazil Abstract. The currents induced during startup in the vacuum vessel of the ETE spherical torus (Experimento Tokamak Esférico) are evaluated using a circuit

  4. EDITAL N. 05/2012 EM 17 DE AGOSTO DE 2012

    E-print Network

    TECNOLOGIA O DIRETOR DO INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS - INPE, no uso de suas atribuições, torna ­ Pesquisador Adjunto I ­ Tecnologia de Plasmas 27/08 14:00 INPE/São José dos Campos Prédio SGC Cargo PQ13

  5. Special Supplement to the Bulletin of the American Meteorological Society

    E-print Network

    Howat, Ian M.

    ), S5­S49. Citing a section (example): Willett, K. M., A. Simmons, and D. Berry, 2014: [Global climate Espaciais (INPE), Cachoeira Paulista, Sao Paulo, Brazil Amador, Jorge A., Center for Geophysical Research

  6. Considerations in the Integration of Small Aircraft Transportation System Higher Volume Operations (SATSHVO) in the National Airspace System (NAS)

    NASA Technical Reports Server (NTRS)

    Lohr, Gary W.; Williams, Dan; Abbott, Terence; Baxley, Brian; Greco, Adam; Ridgway, Richard

    2005-01-01

    The Small Aircraft Transportation System Higher Volume Operations (SATS HVO) concept holds the promise for increased efficiency and throughput at many of the nations under-used airports. This concept allows for concurrent operations at uncontrolled airports that under today s procedures are restricted to one arrival or one departure operation at a time, when current-day IFR separation standards are applied. To allow for concurrent operations, SATS HVO proposes several fundamental changes to today's system. These changes include: creation of dedicated airspace, development of new procedures and communications (phraseologies), and assignment of roles and responsibilities for pilots and controllers, among others. These changes would affect operations on the airborne side (pilot) as well as the groundside (controller and air traffic flow process). The focus of this paper is to discuss some of the issues and potential problems that have been considered in the development of the SATS HVO concept, in particular from the ground side perspective. Reasonable solutions to the issues raised here have been proposed by the SATS HVO team, and are discussed in this paper.

  7. NAS Experiences of Porting CM Fortran Codes to HPF on IBM SP2 and SGI Power Challenge

    NASA Technical Reports Server (NTRS)

    Saini, Subhash

    1995-01-01

    Current Connection Machine (CM) Fortran codes developed for the CM-2 and the CM-5 represent an important class of parallel applications. Several users have employed CM Fortran codes in production mode on the CM-2 and the CM-5 for the last five to six years, constituting a heavy investment in terms of cost and time. With Thinking Machines Corporation's decision to withdraw from the hardware business and with the decommissioning of many CM-2 and CM-5 machines, the best way to protect the substantial investment in CM Fortran codes is to port the codes to High Performance Fortran (HPF) on highly parallel systems. HPF is very similar to CM Fortran and thus represents a natural transition. Conversion issues involved in porting CM Fortran codes on the CM-5 to HPF are presented. In particular, the differences between data distribution directives and the CM Fortran Utility Routines Library, as well as the equivalent functionality in the HPF Library are discussed. Several CM Fortran codes (Cannon algorithm for matrix-matrix multiplication, Linear solver Ax=b, 1-D convolution for 2-D datasets, Laplace's Equation solver, and Direct Simulation Monte Carlo (DSMC) codes have been ported to Subset HPF on the IBM SP2 and the SGI Power Challenge. Speedup ratios versus number of processors for the Linear solver and DSMC code are presented.

  8. GaInNAs-based Hellish-vertical cavity semiconductor optical amplifier for 1.3 ?m operation

    Microsoft Academic Search

    Faten Adel Ismail Chaqmaqchee; Simone Mazzucato; Murat Oduncuoglu; Naci Balkan; Yun Sun; Mustafa Gunes; Maxime Hugues; Mark Hopkinson

    2011-01-01

    Hot electron light emission and lasing in semiconductor heterostructure (Hellish) devices are surface emitters the operation of which is based on the longitudinal injection of electrons and holes in the active region. These devices can be designed to be used as vertical cavity surface emitting laser or, as in this study, as a vertical cavity semiconductor optical amplifier (VCSOA). This

  9. USO DA INFORMÁTICA NAS AULAS DE MATEMÁTICA: OBSTÁCULO QUE PRECISA SER SUPERADO PELO PROFESSOR, O ALUNO E A ESCOLA

    Microsoft Academic Search

    Elizabeth M. Rocha; Lívia M. L. Santiago; Josilane O. Lopes; Dina M. P. Dantas; Hermínio B. Neto

    This article discusses the use of the educational computer science in the classes of Mathematics starting from some obstacles that need to be overcome by the school, because it announces that one of the difficulties of this question is directly linked to the teachers formation. For that it was made a research with teachers and students a public school of

  10. Atomistic calculations of Ga(NAsP)/GaP(N) quantum wells on silicon substrate: Band structure and optical gain

    E-print Network

    Paris-Sud XI, Université de

    - ciency multijunction solar cells. Recently, the epitaxial growth on Si substrate of the quasi lattice pseudopotentials method9 (EPM) or super- cell tight-binding (TB) calculations,10 predicted the energetic position

  11. Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 3, 12741281 Separation of Variables

    E-print Network

    Popovych, Roman

    ­1281 Separation of Variables in the Null Hamilton­Jacobi Equation Claudia CHANU Dipartimento di Matematica the theory of the separation of variables in the Hamilton­Jacobi equation with a fixed value of the energy Introduction The study of the Hamilton­Jacobi equation with a fixed value of the energy is a classical topic

  12. Excitation energy-dependent nature of Raman scattering spectrum in GaInNAs/GaAs quantum well structures

    PubMed Central

    2012-01-01

    The excitation energy-dependent nature of Raman scattering spectrum, vibration, electronic or both, has been studied using different excitation sources on as-grown and annealed n- and p-type modulation-doped Ga1???xInxNyAs1???y/GaAs quantum well structures. The samples were grown by molecular beam technique with different N concentrations (y = 0%, 0.9%, 1.2%, 1.7%) at the same In concentration of 32%. Micro-Raman measurements have been carried out using 532 and 758 nm lines of diode lasers, and the 1064 nm line of the Nd-YAG laser has been used for Fourier transform-Raman scattering measurements. Raman scattering measurements with different excitation sources have revealed that the excitation energy is the decisive mechanism on the nature of the Raman scattering spectrum. When the excitation energy is close to the electronic band gap energy of any constituent semiconductor materials in the sample, electronic transition dominates the spectrum, leading to a very broad peak. In the condition that the excitation energy is much higher than the band gap energy, only vibrational modes contribute to the Raman scattering spectrum of the samples. Line shapes of the Raman scattering spectrum with the 785 and 1064 nm lines of lasers have been observed to be very broad peaks, whose absolute peak energy values are in good agreement with the ones obtained from photoluminescence measurements. On the other hand, Raman scattering spectrum with the 532 nm line has exhibited only vibrational modes. As a complementary tool of Raman scattering measurements with the excitation source of 532 nm, which shows weak vibrational transitions, attenuated total reflectance infrared spectroscopy has been also carried out. The results exhibited that the nature of the Raman scattering spectrum is strongly excitation energy-dependent, and with suitable excitation energy, electronic and/or vibrational transitions can be investigated. PMID:23190628

  13. 75 FR 28610 - Draft EPA's Reanalysis of Key Issues Related to Dioxin Toxicity and Response to NAS Comments

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-21

    ...EPA-HQ-ORD-2010-0395] Draft EPA's Reanalysis of Key Issues Related to Dioxin Toxicity and...entitled, ``EPA's Reanalysis of Key Issues Related to Dioxin Toxicity and...document, ``EPA's Reanalysis of Key Issues Related to Dioxin Toxicity...

  14. 76 FR 57690 - TRICARE; Elimination of the Non-Availability Statement (NAS) Requirement for Non-Emergency...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-16

    ...for Non-Emergency Inpatient Mental Health Care AGENCY: Office of the Secretary...for non-emergency inpatient mental health care in order for a TRICARE Standard...for non-emergency inpatient mental health care. Currently, the...

  15. 75 FR 35800 - Draft EPA's Reanalysis of Key Issues Related to Dioxin Toxicity and Response to NAS Comments

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-23

    ...038A) for independent external review, and public...Step 4--independent external peer review and public...within the EPA Office of Research and Development (ORD). The draft...Act, for independent external peer review. The...

  16. 78 FR 12951 - TRICARE; Elimination of the Non-Availability Statement (NAS) Requirement for Non-Emergency...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-26

    ...Non-Emergency Inpatient Mental Health Care AGENCY: Office of the Secretary...non-emergency inpatient mental health care in order for a TRICARE Standard...non-emergency inpatient mental health care for TRICARE Standard...

  17. Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 1, 266270 Symmetry Reduction

    E-print Network

    Popovych, Roman

    of linear ordinary differential equations (see also [5]). It is the symmetry explanation of "nonlinear Reduction of Nonlinear Differential Equations Ivan TSYFRA Institute of Mathematics, University of Bialystok=f(x) (3) is a solution of equation (2). #12;Symmetry Reduction of Nonlinear Differential Equations 267

  18. Proceedings of Institute of Mathematics of NAS of Ukraine 2002, Vol. 43, Part 1, 252255 Transformation of Scientific System

    E-print Network

    Popovych, Roman

    of scientific knowledge are not identical. The scientific system of knowledge is based on research process directly, and learning system is based on research only indirectly. In this respect the following questions, decomposition into Fourier series, inverse problem and others. All these methods are based on the ideas

  19. Proceedings of Institute of Mathematics of NAS of Ukraine 2000, Vol. 30, Part 1, 223230. Symmetry Groups and Conservation Laws

    E-print Network

    Popovych, Roman

    @bgcict.acad.bg and padjon@bgcict.acad.bg Recent results concerning the application of Lie transformation group methods subjected to an external transverse load and a nonuniform heating. Once the invariance properties of a given (acceleration waves, shock waves, etc.) or in the numerical analysis (when constructing finite difference

  20. Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 2, 850861 The Renormalization Group Symmetry

    E-print Network

    Popovych, Roman

    ­861 The Renormalization Group Symmetry for Solution of Integral Equations Vladimir F. KOVALEV and Dmitriy V. SHIRKOV Institute for Mathematical Modelling, Russian Academy of Science, Moscow, Russia E-mail: kovalev

  1. A COBRANÇA PELO USO DA ÁGUA NAS BACIAS DOS RIOS PARAÍBA DO SUL E PCJ EM 2006: avaliação e evolução

    Microsoft Academic Search

    Giordano Bruno; Moema Versiani Acselrad; Patrick Thadeu Thomas

    RESUMO --- A Lei federal 9.433\\/97 instituiu a Política Nacional de Recursos Hídricos, com fundamentos na gestão descentralizada e participativa, tendo como unidade territorial de planejamento a bacia hidrográfica. A cobrança pelo uso da água é um dos instrumentos previstos para execução da política, cabendo ao Comitê da Bacia estabelecer os mecanismos de cobrança e sugerir os valores. O artigo

  2. Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 2, 759766 Quantum Groups and Cabibbo Mixing

    E-print Network

    Popovych, Roman

    -Mann­Okubo (GMO) mass relation for the SU(3) octet baryons 1 2 + derived in a particular version [5] of `diquark. The alternative improved version of GMO for octet baryons is the extremely precise mass sum rule (MSR) obtained-analog (1) yields the familiar [7] Gell-Mann­Okubo (GMO) mass relation MN +M = 3 2M + 1 2M in the `classical

  3. Proceedings of Institute of Mathematics of NAS of Ukraine 2002, Vol. 43, Part 2, 540547 Quantum Algebras, Particle Phenomenology,

    E-print Network

    Popovych, Roman

    -Mann­Okubo (GMO) one, that is, mN +m = 3 2 m + 1 2m. On the contrary, the spectrum generating (or dynamical between isomultilplets (breaking of SU(3) to SU(2)), instead of the standard GMO mass relation

  4. A influência da ocupação profissional na flexibilidade global e nas amplitudes angulares dos membros inferiores e da lombar

    Microsoft Academic Search

    Sandra Aliberti; Bergson Weber; Cabral Queiroz; Denise Pripas; Isadora Kieling; Adriana Elisa Sellmer; Amaro Malvestio; Marcel Tomonori Sera

    Resumo - O desenvolvimento tecnológico no ambiente de trabalho gerou um au- mento no tempo em que os indivíduos permanecem sentados enquanto trabalham em escritórios. Isto pode estar influenciando negativamente capacidades físicas inatas como a flexibilidade da cadeia posterior do corpo, porém poucos são os estudos que avaliaram a influência do trabalho nesta capacidade física. Esta avaliação pode contribuir para

  5. Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 1, 142148 Invariants for Evolution Equations

    E-print Network

    Popovych, Roman

    (x)usux, etc. It can be shown that equations (1) admit equivalence transformation x = P(x), t = c1t + c2, u = R Karlskrona, Sweden E-mail: nib@bth.se Department of Mathematics and Statistics, University of Cyprus, CY 1678 Nicosia, Cyprus E-mail: christod@ucy.ac.cy In the spirit of the recent work of Ibragimov [1] who

  6. 75 FR 33615 - Draft EPA's Reanalysis of Key Issues Related to Dioxin Toxicity and Response to NAS Comments (EPA...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-14

    ...revises the draft assessment in response to the independent external peer...steps (hazard identification and dose-response evaluation) of the risk assessment...IRIS provides oral reference doses (RfDs) and inhalation...

  7. Sociedade & Natureza, Uberlndia, 21 (1): 39-49, ABR. 2009 Making species distribution models available on the web for reuse in biodiversity experiments: euterpe edulis species case study

    E-print Network

    Camara, Gilberto

    experimentos de biodiversidade: Estudo de caso com a espécie Euterpe edulis Karla Donato Fook Instituto Instituto Nacional de Pesquisas Espaciais ­ INPE São José dos Campos/SP ­ Brasil silvana@dpi.inpe.br Antônio Miguel Vieira Monteiro Instituto Nacional de Pesquisas Espaciais ­ INPE São José dos Campos/SP ­ Brasil

  8. Reconstrução tridimensional de arcos magnéticos por tomografia

    NASA Astrophysics Data System (ADS)

    Simões, P. J. A.; Costa, J. E. R.

    2003-08-01

    Uma explosão solar é uma variação súbita do brilho que ocorre nas regiões ativas da atmosfera solar. Estas regiões são constituídas por um plasma magnetizado com intensa indução magnética e em cenários bem complexos como visto recentemente através de experimentos embarcados em satélites operando instrumentos em raios X moles e ultra-violeta distante. A energia magnética, que pode ser armazenada por um período de horas até dias em configurações magnéticas estressadas, é subitamente lançada na atmosfera solar e transferida para partículas como elétrons, prótons e núcleos pesados, que são acelerados e/ou aquecidos, produzindo radiação eletromagnética. A proposta final deste projeto é determinar as características espaciais de alta resolução da emissão e polarização girossincrotrônica de explosões solares em ambientes complexos de campos magnéticos. Os recentes resultados da emissão difusa em EUV apresentado pelos satélites TRACE e SOHO dos arcos magnéticos conectando as diferentes polaridades magnéticas sobre as regiões ativas possibilitam novas abordagens sobre o papel do campo magnético na emissão em rádio. Nesta etapa apresentamos os resultados da reconstrução da geometria tridimensional das linhas de força destes arcos utilizando técnicas tomográficas, a partir de imagens de alta resolução espacial obtidas pelo instrumento EIT (Extreme ultraviolet Imaging Telescope), além da modelagem das induções magnéticas por um campo dipolar e as densidades de partículas aceleradas. Utilizamos para a reconstrução geométrica, imagens tomadas em vários ângulos dos arcos devido à rotacão solar. Com estes resultados, daremos continuidade ao projeto, com os cálculos da transferência radiativa nos modos ordinário e extraordinário de propagação da radiação girossincrotrônica de explosões solares.

  9. CARACTERÍSTICAS PSICOMÉTRICAS DE LA ESCALA DE ADHERENCIA AL TRATAMIENTO DE LA DIABETES MELLITUS TIPO II-VERSIÓN III (EATDM-III ©) EN UNA MUESTRA DE PACIENTES DIABÉTICOS DE COSTA RICA1

    Microsoft Academic Search

    ALFONSO VILLALOBOS-PÉREZ; JUAN C. BRENES-SÁENZ; DIEGO QUIRÓS-MORALES

    The Scale for Treatment Adherence in Type 2 Diabetes Mellitus - version III (EATDM-III©) was tested. It was compounded by the following factors: Family Support, Organization and Community Support, Physical Exercise, Medical Control, Hygiene and Self-Care, Diet and Assessment of Physical Condition. The research was developed at Dr. Rafael Ángel Calderón Guardia Hospital, Costa Rica, n=104 subjects, both genders, during

  10. Cloning of Nicotianamine Synthase Genes, Novel Genes Involved in the Biosynthesis of Phytosiderophores

    Microsoft Academic Search

    Kyoko Higuchi; Kazuya Suzuki; Hiromi Nakanishi; Hirotaka Yamaguchi; Naoko-Kishi Nishizawa; Satoshi Mori

    1999-01-01

    Nicotianamine synthase (NAS), the key enzyme in the biosyn- thetic pathway for the mugineic acid family of phytosiderophores, catalyzes the trimerization of S-adenosylmethionine to form one molecule of nicotianamine. We purified NAS protein and isolated the genes nas1, nas2, nas3, nas4, nas5-1, nas5-2, and nas6, which encode NAS and NAS-like proteins from Fe-deficient barley (Horde- um vulgare L. cv Ehimehadaka

  11. A description of work accomplished under Contract NAS 7-100 between the California Institute of Technology and the National Aeronautics and Space Administration

    E-print Network

    Waliser, Duane E.

    and the extended phase of the Mariner V Venus flyby mis- sion. Pioneering pulsar observations at S-band, radar observation of the asteroid Icarus, and detailed map- ping of the planet Venus are typical of the radio phases of en- gineering and development of the Mariner spacecraft scheduled for Mars flyby flights early

  12. An analysis of Hall mobility in as-grown and annealed n- and p-type modulation-doped GaInNAs/GaAs quantum wells

    PubMed Central

    2012-01-01

    In this study, we investigate the effect of annealing and nitrogen amount on electronic transport properties in n- and p-type-doped Ga0.68In0.32NyAs1 ? y/GaAs quantum well (QW) structures with y?=?0%, 0.9%, 1.2%, 1.7%. The samples are thermal annealed at 700°C for 60 and 600 s, and Hall effect measurements have been performed between 10 and 300 K. Drastic decrease is observed in the electron mobility of n-type N-containing samples due to the possible N-induced scattering mechanisms and increasing effect mass of the alloy. The temperature dependence of electron mobility has an almost temperature insensitive characteristic, whereas for p-type samples hole mobility is decreased drastically at T?>?120 K. As N concentration is increased, the hole mobility also increased as a reason of decreasing lattice mismatch. Screening effect of N-related alloy scattering over phonon scattering in n-type samples may be the reason of the temperature-insensitive electron mobility. At low temperature regime, hole mobility is higher than electron mobility by a factor of 3 to 4. However, at high temperatures (T?>?120 K), the mobility of p-type samples is restricted by the scattering of the optical phonons. Because the valance band discontinuity is smaller compared to the conduction band, thermionic transport of holes from QW to the barrier material, GaAs, also contributes to the mobility at high temperatures that results in a decrease in mobility. The hole mobility results of as-grown samples do not show a systematic behavior, while annealed samples do, depending on N concentration. Thermal annealing does not show a significant improvement of electron mobility. PMID:23009196

  13. Magnetotransport study on as-grown and annealed n- and p-type modulation-doped GaInNAs/GaAs strained quantum well structures

    PubMed Central

    2014-01-01

    We report the observation of thermal annealing- and nitrogen-induced effects on electronic transport properties of as-grown and annealed n- and p-type modulation-doped Ga1 - xInxNyAs1 - y (x?=?0.32, y?=?0, 0.009, and 0.012) strained quantum well (QW) structures using magnetotransport measurements. Strong and well-resolved Shubnikov de Haas (SdH) oscillations are observed at magnetic fields as low as 3 T and persist to temperatures as high as 20 K, which are used to determine effective mass, 2D carrier density, and Fermi energy. The analysis of temperature dependence of SdH oscillations revealed that the electron mass enhances with increasing nitrogen content. Furthermore, even the current theory of dilute nitrides does not predict a change in hole effective mass; nitrogen dependency of hole effective mass is found and attributed to both strain- and confinement-induced effects on the valence band. Both electron and hole effective masses are changed after thermal annealing process. Although all samples were doped with the same density, the presence of nitrogen in n-type material gives rise to an enhancement in the 2D electron density compared to the 2D hole density as a result of enhanced effective mass due to the effect of nitrogen on conduction band. Our results reveal that effective mass and 2D carrier density can be tailored by nitrogen composition and thermal annealing-induced effects. PACS 72.00.00; 72.15.Gd; 72.80.Ey PMID:24661541

  14. INFLUÊNCIA DO DESCAROÇAMENTO NAS CARACTERÍSTICAS TECNOLÓGICAS DA FIBRA DO ALGODÃO ANALISADAS PELO HVI (HIGH VOLUME INSTRUMENTS) E PELO AFIS (ADVANCED FIBER INFORMATION SYSTEM)1

    Microsoft Academic Search

    ODILON RENY; RIBEIRO FERREIRA DA SILVA; MARIA JOSÉ DA SILVA

    This work had the objective to evaluate the effect of three cotton ginning methods on intrinsic and extrinsic cotton fiber characteristics analized by the HVI (High Volume Instrumentes) and AFIS (Advanced Fiber Information System) equipaments. The following treatments were studied: 1) roller gin machine; 2) 50 saw-brush gin smal works prototype; 3) stand 90 saw-brush gin machine. Seed cotton samples

  15. LA gEsTIONE DEL CARCINOMA MAMMARIO IN gRAvIDANzA: CuRARE LA MAMMA TuTELANDO IL NAsCITuRO

    Microsoft Academic Search

    Saverio Cinieri; Fedro Peccatori; Stefano Burlizzi; Laura Orlando; Palma Fedele

    Breast cancer disease in pregnancy is a rare disease. the strategy of treatment and the choices of timing (chemotherapy, surgery of the breast and radio - therapy) are dipendent by the presence of the fetus. in this work is discussed the management of thi extremely rare clinical situation and are reported the experiences of the authors.

  16. Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 2, 677684 Some Applications of a Lorentz-Like Formulation

    E-print Network

    Popovych, Roman

    Applications of a Lorentz-Like Formulation of Galilean Invariance Marc DE MONTIGNY , Faqir KHANNA and Ademir@phys.ualberta.ca Department of Physics, University of Alberta, Edmonton, Alberta, T6J 2J1, Canada E-mail: khanna-invariant; (2) as a term added to the classical #12;678 M. de Montigny, F.C. Khanna and A.E. Santana free

  17. Proceedings of Institute of Mathematics of NAS of Ukraine 2000, Vol. 30, Part 2, 481488. Crystal Basis Model of the Genetic Code

    E-print Network

    Popovych, Roman

    features of a model of genetic code based on the crystal basis of Uq0(sl(2)sl(2)) is presented by one of the four elementary bases: adenine (A) and guanine (G) deriving from purine, and cytosine (C of the genetic information in the cytoplasm is achieved , schematically speaking, by the ribonucleic acid or RNA

  18. ANÁLISE POR CROMATOGRAFIA GASOSA DE BTEX NAS EMISSÕES DE MOTOR DE COMBUSTÃO INTER NA ALIMENTADO COM DIESEL E MISTURA DIESEL-BIODIESEL (B10)

    Microsoft Academic Search

    Sérgio L. Ferreira; Antônio M. dos Santos; Gustavo R. de Souza; Wagner L. Polito; Délson L. Módolo; Fundação Hermínio Ometto; Maximiliano Baruto

    2008-01-01

    ANALYSIS OF BTEX IN THE EMISSIONS FROM AN INTERNAL COMBUSTION ENGINE BURNING DIESEL OIL AND DIESEL-BIODIESEL MIXTURE (B10) BY GAS CHROMATOGRAPHY. This paper describes the procedures for analysing pollutant gases emitted by engines, such as volatile organic compounds (benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene) by using high resolution gas chromatography (HRGC). For IC engine burning, in a broad sense,

  19. Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 2, 881885 Generation of Glauber Coherent State Superpositions

    E-print Network

    Popovych, Roman

    of realizing interesting experiments able to bring to the light peculiarities of quantum mechanics a microscopic quantum object (an atom) with a macroscopic one (a cat) has been realized. No unfortunate feline the possibility of testing fundamental quantum physics aspects giving at experimentalist's disposal compound

  20. Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 1, 356367 Aspects of Quantum Groups and Integrable Systems

    E-print Network

    Popovych, Roman

    is often expressed via a q-hierarchy picture akin to the standard Hirota­Lax­Sato formulation and this has by more or less ad hoc manipulation of noncommutative differential calculi or by variations of classical Lie group methods applied to quantum groups. We examine first the hierarchy picture briefly and notice

  1. Os efeitos de um programa de atividade física de carga progressiva nas propriedades físicas e na força óssea de ratas osteopênicas

    Microsoft Academic Search

    Ana Claudia Muniz Renno; Flavia Roberta Faganello; Fernanda Mendes de Moura; Nádia Slemer Andrade dos Santos; Renata Passarelli Tirico; Paulo Sérgio Bossini; Jose Antonio Zuanon; Carlos Benatti Neto; Nivaldo Antonio Parizotto

    2007-01-01

    SUMMARY Background: Many studies have shown that physical exercises are able to stimulate bone formation and increase bone mass, constituting a therapeutic modality for the treatment of bone loss due to osteoporosis. However, some points about the intensity, duration and frequency of the exercises remain confusing and contradictory. Thus, the aim of this study was to determine the effects of

  2. Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 1, 382387 New Lumps of VeselovNovikov Integrable Nonlinear

    E-print Network

    Popovych, Roman

    of Veselov­Novikov Integrable Nonlinear Equation and New Exact Rational Potentials of Two) evolution equation and exact rational potentials of two- dimensional stationary Schr¨odinger (2DSchr evolution equations. · To construct explicitly broad classes of exactly solvable variable coefficients

  3. Review of the NAS/NRC report: {open_quotes}Groundwater at Yucca Mountain: How high can it rise?{close_quotes}. Special report No. 1

    SciTech Connect

    Archambeau, C.B.

    1992-12-01

    There are three basic and serious problems that produce disagreement with the conclusions and recommendations of the Academy report entitled {open_quotes}Groundwater at Yucca Mountain: How high can it rise?{close_quotes}. These are: First, the report ignores a considerable body of critical data relating to the ages and nature of hydrothermal alterations at the site; second, many of the strong conclusions expressed in the report are not reasonably supported by the evidence presented and, in some cases, are inconsistent with data and results available to the committee but which are not cited or used by them; and finally, there are statements describing field relationships and data that are not consistent with the facts or are made in such a way as to be misleading.

  4. Proceedings of Institute of Mathematics of NAS of Ukraine 2002, Vol. 43, Part 2, 768773 Towards Classification of Separable Pauli Equations

    E-print Network

    Popovych, Roman

    field, H = rot A is the magnetic field, = (1, 2, 3) are the Pauli matrices 1 = 0 1 1 0 , 2 = 0 -i i 0 particle interacting with the electro- magnetic field. As a result, we get eleven classes of the vector-potentials of the electro- magnetic field providing separability of the corresponding Pauli equations. It is shown

  5. Performance Characteristics of Hybrid MPI/OpenMP Implementations of NAS Parallel Benchmarks SP and BT on Large-scale Multicore Clusters

    E-print Network

    Benchmarks SP and BT on Large-scale Multicore Clusters Xingfu Wu and Valerie Taylor Department of Computer be used with the communication between nodes. In this paper, we use SP and BT benchmarks of MPI NPB 3.3 as a basis for a comparative approach to implement hybrid MPI/OpenMP versions of SP and BT. In particular, we

  6. Caracterização de risco de déficit hídrico nas regiões produtoras de soja no Brasil Characterization of the water deficit for brazilian soybean producing regions

    Microsoft Academic Search

    José Renato Bouças Farias; Eduardo Delgado Assad; Ivan Rodrigues de Almeida; Balbino Antônio; Cláudio Lazzarotto; Norman Neumaier; Alexandre Lima Nepomuceno

    2001-01-01

    In the current globalized agro-scenario, increments in yield and reductions in costs and in risks of failure became basic requirements to the competitiveness. Increased efficiency in the use of resources and inputs, improved quality of farm products and preserved environments are challenges of the modern agriculture. Tools for helping the decision making process are essential to tackle these challenges and

  7. Evaluations of HRI (heat recovery incinerators) at NS (Naval Station) Mayport and NAS (Naval Air Station) Jacksonville, Florida lessons-learned report. Final report, January-June 1984

    SciTech Connect

    Frounfelker, R.; Belencan, H.

    1984-07-01

    The heat recovery incinerators (HRI) at Naval Station Mayport and Naval Air Station Jacksonville, Fla., were studied to determine any lessons that could be learned from the planning, design, construction, operation, and maintenance of these HRIs. The study examined the various problems in these areas, including description of each problem, an analysis of why the problem occurred, and a description of how the problem was alleviated, if it was corrected.

  8. DINMICA DE GASES RAREFEITOS E SUAS APLICAES Felix Sharipov

    E-print Network

    Sharipov, Felix

    . A aplicação da teoria a microdispositivos, ao experimento KATRIN e na aerotermodinâmica de veículos espaciais Navier-Stokes, as quais formam um conjunto de equações diferenciais parciais acopladas para o campo de

  9. Heterogeneity of Soils and Vegetation in an Eastern Amazonian

    E-print Network

    , Massachusetts 02543, USA; 2 Instituto Nacional de Pesquisas Espaciais, Sa~o Jose´ dos Campos, SP, Brazil; and 3, biomass, stem density). We found some evidence for increased drought stress on the sandier sites indicated full or nearly full rehydration, suggest- ing significant interspecific variability in drought

  10. REGIMENTO DO CURSO DE PS-GRADUAO EM CINCIA E TECNOLOGIA DE MATERIAIS E SENSORES

    E-print Network

    REGIMENTO DO CURSO DE PÓS-GRADUAÇÃO EM CIÊNCIA E TECNOLOGIA DE MATERIAIS E SENSORES TÍTULO I DOS OBJETIVOS DA ÁREA DE CONCENTRAÇÃO Art. 1 ­ A Área de Concentração em Ciência e Tecnologia de Materiais e Sensores (CMS), do Curso de Pós-graduação em Engenharia e Tecnologia Espaciais (ETE) do INPE, tem como

  11. INPE-Sustentvel PLANO DE GESTO

    E-print Network

    PESQUISAS ESPACIAIS (INPE) MNISTÉRIO DE CIÊNCIA, TECNOLOGIA E INOVAÇÃO (MCTI) AGOSTO/2013 #12;INPE GESTÃO INTERNA - CGI Ciro Hernandes COORDENADOR DE TECNOLOGIA DA INFORMAÇÃO - CTI Antônio Ésio Marcondes Pedro Machado C. de Castro Neil Ferreira Gonçalves Maria Cristina Luiz Simões Serviço de Tecnologia da

  12. Yet Another Map Algebra Joo Pedro Cerveira Cordeiro & Gilberto Cmara &

    E-print Network

    Camara, Gilberto

    maps came from the works of Tomlin and Berry at Yale University in the 1980's (see Tomlin José dos Campos, São Paulo, Brazil e-mail: jpedro@dpi.inpe.br G. Câmara e-mail: gilberto@dpi.inpe.br U Espaciais (FUNCATE), São José dos Campos, São Paulo, Brazil e-mail: bira@funcate.org.br F. Almeida Instituto

  13. Ann. Geophys., 25, 24972502, 2007 www.ann-geophys.net/25/2497/2007/

    E-print Network

    Paris-Sud XI, Université de

    Ann. Geophys., 25, 2497­2502, 2007 www.ann-geophys.net/25/2497/2007/ © European Geosciences Union), Sao Jose dos Campos, SP, Brazil 2Centro Universitario Luterano de Palmas (CEULP/ULBRA), Palmas, TO, Brazil 3Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP, Brazil Received: 25

  14. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, VOL. 43, NO. 8, AUGUST 2005 1855 Analysis and Optimization of the MODIS Leaf Area

    E-print Network

    Myneni, Ranga B.

    IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, VOL. 43, NO. 8, AUGUST 2005 1855 Analysis.P. 515, Brazil. Y. E. Shimabukuro is with the Instituto Nacional de Pesquisas Espaciais, Di- visão de Sensoriamento Remoto, São José dos Campos, CEP 12227-010, C.P. 515, Brazil. Digital Object Identifier 10

  15. Ann. Geophys., 25, 23712392, 2007 www.ann-geophys.net/25/2371/2007/

    E-print Network

    Boyer, Edmond

    Ann. Geophys., 25, 2371­2392, 2007 www.ann-geophys.net/25/2371/2007/ © European Geosciences Union Espaciais (INPE), C. P. 515, S~ao Jos´e dos Campos, SP, Brazil 2Universidade do Vale do Para´iba (UNIVAP), Av. Shishima Hifumi, 2911, Urbanova, S~ao Jos´e dos Campos, SP, Brazil Received: 25 April 2007

  16. Ann. Geophys., 25, 399406, 2007 www.ann-geophys.net/25/399/2007/

    E-print Network

    Paris-Sud XI, Université de

    Ann. Geophys., 25, 399­406, 2007 www.ann-geophys.net/25/399/2007/ © European Geosciences Union 2007.109­170, Brazil 2Instituto Nacional de Pesquisas Espaciais (INPE), Av dos Astronautas 1758, C. Postal: 515 S~ao Jos´e dos Campos, S~ao Paulo, 12.201­970, Brazil Received: 4 April 2006 ­ Revised: 10 November 2006

  17. Cloning of nicotianamine synthase genes, novel genes involved in the biosynthesis of phytosiderophores.

    PubMed

    Higuchi, K; Suzuki, K; Nakanishi, H; Yamaguchi, H; Nishizawa, N K; Mori, S

    1999-02-01

    Nicotianamine synthase (NAS), the key enzyme in the biosynthetic pathway for the mugineic acid family of phytosiderophores, catalyzes the trimerization of S-adenosylmethionine to form one molecule of nicotianamine. We purified NAS protein and isolated the genes nas1, nas2, nas3, nas4, nas5-1, nas5-2, and nas6, which encode NAS and NAS-like proteins from Fe-deficient barley (Hordeum vulgare L. cv Ehimehadaka no. 1) roots. Escherichia coli expressing nas1 showed NAS activity, confirming that this gene encodes a functional NAS. Expression of nas genes as determined by northern-blot analysis was induced by Fe deficiency and was root specific. The NAS genes form a multigene family in the barley and rice genomes. PMID:9952442

  18. Realizacao domestica e escolar de foto e video 3D

    E-print Network

    Jose J. Lunazzi

    2012-12-19

    English: Industry does not give attention to the small domestic or professional market of digital technologies for 3D images. What was done on the XX century by using photographic film is not know available to the common people, though the facilities are even better. Some technique developed in Brasil twenty years ago and the use of conventional domestic photo or video cameras allows fot making pictures and films at home by using digital conversions for editing, and two-color goggles. The anaglyphic technique, the same NASA employs to show Mars images to the public, is not employed in Brazil yet. We must analize the reasons for that. Portugues: A industria nao tem dado atencao ao mercado domestico ou profissional de pequena escala nas novas tecnologias digitais para imagem 3D. O que foi feito ao longo do seculo XX usando filme fotografico nao esta hoje ao alcance das pessoas, sendo que a facilidade de uso e muito maior. Tecnicas desenvolvidas no Brasil ha mais de vinte anos, e o uso de simples cameras convencionais de fotografia e video permitem realizar fotos e filmes caseiros por meio de conversoes digitais na edicao e o uso de oculos bicolor. A tecnica anagifica, a mesma que a NASA usa para mostrar ao publico as imagens de Marte, por exemplo, nao teve espaco no Brasil ainda. Devemos analisar os motivos que podem estar influenciando e os caminhos para mudar isso.

  19. Variabilidade óptica de longo período e precessão de jato: o caso de BL Lacertae

    NASA Astrophysics Data System (ADS)

    Caproni, A.; Abraham, Z.

    2003-08-01

    Variabilidade é tipicamente uma característica de AGNs, sendo observada em toda a faixa eletromagnética. Em relação às escalas de tempo, variações desde horas até de algumas décadas foram encontradas por vários autores. Em alguns casos, análises temporais de curvas de luz mostram a existência de periodicidade nas variações observadas. Um exemplo de objeto que preenche as características mencionadas acima é BL Lacertae, o protótipo da classe BL Lac dos AGNs. Neste trabalho, nós interpretamos a variabilidade periódica de longo período detectada na curva de luz na banda B (~7,5 anos) como o resultado da periodicidade na amplificação da radiação oriunda do jato relativístico. Neste cenário, a amplificação periódica seria induzida pela precessão, que muda o ângulo entre o jato e a linha de visada. Com esta abordagem e vínculos adicionais fornecidos por observações em altas energias, nós podemos impor limites para os parâmetros do modelo de precessão, tais como o fator de Lorentz associado ao movimento global do jato, o ângulo de abertura do cone de precessão e o ângulo entre o eixo do cone e a linha de visada.

  20. Avaliação do índice de temperatura de globo negro e umidade e desempenho de suínos nas fases de crescimento e terminação criados em sistemas em camas sobrepostas em condições de verão

    Microsoft Academic Search

    Ilda de Fátima Ferreira Tinôco; Cecília de Fátima Souza; Paulo Armando Victoria de Oliveira; Robson Mendes de Paulo; Josiane Aparecida Campos; Cinara da Cunha Siqueira Carvalho; Marcelo Bastos Cordeiro

    2007-01-01

    RESUMO - Um estudo foi realizado com o objetivo de avaliar o sistema de criação em camas sobrepostas de maravalha e de casca de arroz, em comparação ao piso tradicional de concreto e sua influência no desempenho dos animais com base no ITGU (Índice de Temperatura de Globo negro e Umidade), no ganho de peso, no consumo de ração, na

  1. Influência de defeitos e diferentes processos de fabricação nas propriedades mecânicas finais de cerâmicas (Influence of defects and different processes of manufacture on the final mechanical properties of ceramics)

    Microsoft Academic Search

    D. Schuller; E. C. Bianchi; P. R. Aguiar

    Resumo Os materiais cerâmicos são atualmente cada vez utilizados como opção na engenharia mundial. Por se tratar de materiais com alta resistência mecânica, possuem muitas aplicações em diversas áreas, como por exemplo a de mancais, a automotiva (sensores, isoladores, catalisadores, pistões, válvulas, revestimentos), a de implantes biocompatíveis (dentário, substituição óssea, válvulas cardíacas), a de produtos sujeitos ao desgaste (guias), a

  2. Ground Software Maintenance Facility (GSMF) user's manual. Appendices NASA-CR-178806 NAS 1.26:178806 Rept-41849-G159-026-App HC A05/MF A01

    NASA Technical Reports Server (NTRS)

    Aquila, V.; Derrig, D.; Griffith, G.

    1986-01-01

    Procedures are presented that allow the user to assemble tasks, link, compile, backup the system, generate/establish/print display pages, cancel tasks in memory, and to TET an assembly task without having to enter the commands every time. A list of acronyms is provided. Software identification, payload checkout unit operating system services, data base generation, and MITRA operating procedures are also discussed.

  3. Geoprocessamento aplicado ao mapeamento dos impactos socioambientais decorrentes das formas de uso da terra nas Áreas de Preservação Permanente (APPs) da Represa de Salto Grande no município de Americana (SP)

    Microsoft Academic Search

    Joyce Rodrigues da Cruz

    The Dam of Salto Grande, occupying an area of 10.5 km2, is located in the hydrographical basin of the Atibaia River, important tributary of the Piracicaba River, in the State of São Paulo. It takes care of, in the present time, to the inhabitants of the cities of Americana, Paulínia and Nova Odessa, that also use the source for activities

  4. [Review of] Stali?nas, Darius. Making Russians: Meaning and Practice of Russification in Lithuania and Belarus after 1863. On the Boundary of Two Worlds: Identity, Freedom, and Moral Imagination in the Baltics, 11.

    E-print Network

    Greenberg, Marc L.

    2008-01-01

    Jordania, East Hampton, New York Staliûnas, Darius. Making Russians: Meaning and Practice of Russification in Lithuania and Belarus after 1863. On the Boundary of Two Worlds: Identity, Freedom, and Moral Imagination in the Baltics, 11. New York: Rodopi... fully the process of integrating the heterogeneously populated northwestern provinces (NWP)—today’s Lithuania and Belarus—into the Russian Empire following the January Uprising of 1863. He provides the necessary context for understanding the period...

  5. Strategic Plans for the Future of Solar Physics: a community discussion of the NASA Sun-Earth Connection Program Roadmap and the NAS Decadal Survey of Astronomy and Astrophysics (Solar Astronomy section)

    Microsoft Academic Search

    K. Schrijver; M. Knoelker

    1999-01-01

    The NASA Sun-Earth Connections Program is currently revising its Roadmap, the long-range plan for science goals, technology development, and missions between 2000 and 2040. From the interior dynamics of the Sun, to the interactions of plasma, fields, and radiation in the photosphere and solar atmosphere, to the heating and structure of the corona, to the acceleration, structure, and evolution of

  6. A Pos-Graduacao Nas Ciencias Humanas e o Paradigma da Medicina: A Era da Especializacao. (Post-Graduation in the Human Sciences and the Paradigm of Medicine: The Era of Specialization.)

    ERIC Educational Resources Information Center

    Costa, Celio Juvenal

    2000-01-01

    Reflects on the current tendency in Brazilian higher education for greater and greater specialization, particularly in human sciences and in medicine. Calls for less specialization and a more historic and general preparation, especially in teacher education. (BT)

  7. Estimación de la Validez de Constructo y Consistencia Interna de la Escala de Impacto de las Imágenes Femeninas Presentadas por los Medios de Comunicación sobre Adolescentes Mujeres. * Construct Validity and Reliability of an Instrument to Assess the Impact of Female Images Presented by the Mass Media on Female Adolescents

    Microsoft Academic Search

    M. Elena; Larraín Sundt

    This paper aimed to estimate reliability and construct validity of an instrument to assess the impact of female images presented by the mass media on body image of female adolescents (IMAMIF) of Larraín, Camus, Orellana and Arrieta, in a sample of 662 female adolescents. It is a questionnaire of 45 statements that evaluates the impact that female images presented by

  8. A11. CARACTERIZACIÓN DE SISTEMAS DE PRODUCCIÓN AGROPECUA RIA ANDINA Y PROPUESTA DE GUIA DE PRODUCCIÓN TÉCNICA PA RA UPAS A PEQUEÑA ESCALA ECUADOR 2007 * CHARACTERIZATION OF ANDEAN AGRICULTURAL PRODUCTION SYSTEMS AND PROPOSAL OF A THECHNICAL PRODUCTION GUI DE AT SMALL SCALE. ECUADOR 2007

    Microsoft Academic Search

    María Isabel Borja; Ernesto Erazo

    SUMMARY This investigation aims to evaluate the results the agricultural production systems of the Andean highland communities of the Northern Central region of the Ecuadorian Sierra, based on results obtained in 10 communities. The ef ficiency indexes for each of the localities studied, did not reach a value 1 which i ndicates that the human, economic, and natural resources in

  9. A comparison of PETSc library and HPF implementations of an archetypal PDS computation 1 This work was supported by the National Aeronautics and Space Administration under NASA Contract Nos NAS1-97046 and NAS1-19480, whilst the authors were in residence at ICASE MS 403, NASA Langley Research Center, Hampton, VA 23681-0001. Access to the NASA SP2s was provided under the NASA High Performance Computing and Communication Program. 1

    Microsoft Academic Search

    M. Ethesham Hayder; David E. Keyes; Piyush Mehrotra

    1998-01-01

    Two paradigms for distributed-memory parallel computation that free the application programmer from the details of message passing are compared for an archetypal structured scientific computation—a nonlinear, structured-grid partial differential equation boundary value problem—using the same algorithm on the same hardware. Both paradigms, parallel libraries represented by Argonne's PETSc, and parallel languages represented by the Portland Group's HPF, are found to

  10. 27-28 de outubro de 2004 21h30min -0h30min

    E-print Network

    Geral de Ciências Espaciais e Atmosféricas & Coordenação de Relações Institucionais ECLIPSES DA LUA (e Eclipses da Lua: tipos e durações O eclipse de hoje Eclipses do Sol: tipos e durações Frequência dos eclipses Próximos eclipses #12;Outubro/2004 Dr. André Milone (DAS-INPE) 3 A Terra e o seu satélite natural

  11. Registro do documento original:

    E-print Network

    Domingues, Margarete Oliveira

    @80/2008/04.28.13.43> MINIST�RIO DA CI�NCIA E TECNOLOGIA INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS ­ INPE Ministro de Estado da Ciência e TecnologiaMinistro de Estado da Ciência e TecnologiaMinistro de Estado da Ciência e TecnologiaMinistro de Estado da Ciência e Tecnologia Sérgio Machado Rezende Secretário Executivo do Ministério da

  12. Ann. Geophys., 24, 16171623, 2006 www.ann-geophys.net/24/1617/2006/

    E-print Network

    Paris-Sud XI, Université de

    Ann. Geophys., 24, 1617­1623, 2006 www.ann-geophys.net/24/1617/2006/ © European Geosciences Union Nacional de Pesquisas Espaciais ­ P.O. Box 515 ­ S. J. Campos, SP, Brazil Received: 17 August 2005 MHz backscatter radar (2.33 S, 44.2 W, DIP: ­0.5), at S~ao Lu´is, Brazil, we ob- tained Range Time

  13. Determination of N-acetylserotonin and Melatonin Activities in the Pineal Gland, Retina, Harderian Gland, Brain and Serum of Rats and Chickens

    Microsoft Academic Search

    S. F. Pang; G. M. Brown; L. J. Grota; J. W. Chambers; R. L. Rodman

    1977-01-01

    An N-acetylserotonin\\/melatonin radioimmunoassay (NAS\\/Mel RIA) and a Mel RIA were developed to measure NAS and Mel contents in tissues of rats and chickens. Anti-NAS and anti-Mel sera were produced by immunization of rabbits with NAS-M-bovine serum albumin (BSA) and Mel-M-BSA, respectively. Anti-NAS serum used in the NAS\\/Mel RIA reacts equally well with NAS and Mel, while anti-Mel serum used in

  14. Nitrogen oxyanion-dependent dissociation of a two-component complex that regulates bacterial nitrate assimilation.

    PubMed

    Luque-Almagro, Victor M; Lyall, Verity J; Ferguson, Stuart J; Roldán, M Dolores; Richardson, David J; Gates, Andrew J

    2013-10-11

    Nitrogen is an essential nutrient for growth and is readily available to microbes in many environments in the form of ammonium and nitrate. Both ions are of environmental significance due to sustained use of inorganic fertilizers on agricultural soils. Diverse species of bacteria that have an assimilatory nitrate/nitrite reductase system (NAS) can use nitrate or nitrite as the sole nitrogen source for growth when ammonium is limited. In Paracoccus denitrificans, the pathway-specific two-component regulator for NAS expression is encoded by the nasT and nasS genes. Here, we show that the putative RNA-binding protein NasT is a positive regulator essential for expression of the nas gene cluster (i.e. nasABGHC). By contrast, a nitrogen oxyanion-binding sensor (NasS) is required for nitrate/nitrite-responsive control of nas gene expression. The NasS and NasT proteins co-purify as a stable heterotetrameric regulatory complex, NasS-NasT. This protein-protein interaction is sensitive to nitrate and nitrite, which cause dissociation of the NasS-NasT complex into monomeric NasS and an oligomeric form of NasT. NasT has been shown to bind the leader RNA for nasA. Thus, upon liberation from the complex, the positive regulator NasT is free to up-regulate nas gene expression. PMID:24005668

  15. Estudo em microondas do aprisionamento e precipitação de elétrons em explosões solares

    NASA Astrophysics Data System (ADS)

    Rosal, A. C.; Costa, J. E. R.

    2003-08-01

    Uma explosão solar é uma variação rápida e intensa do brilho que ocorre nas chamadas regiões ativas da atmosfera, constituídas por um plasma magnetizado com intensa indução magnética. Os modelos de explosões solares atuais, discutidos na literatura, apresentam características de aprisionamento e precipitação de elétrons em ambientes magnéticos simplificados. Neste trabalho, nos propusemos a separar a emissão dos elétrons aprisionados da emissão dos elétrons em precipitação apenas a partir da emissão em microondas, melhorando portanto o controle sobre o conjunto de parâmetros inferidos. A emissão em microondas da população em precipitação é bastante fraca e portanto da nossa base de dados de 130 explosões observadas pelo Rádio Polarímetro de Nobeyama, em sete freqüências, apenas para 32 foi possível separar as duas componentes de emissão com uma boa razão sinal/ruído. A partir de estudos das escalas de tempo das emissões devidas à variação gradual da emissão no aprisionamento e da variação rápida da emissão dos elétrons em precipitação foi possível obter a separação utilizando um filtro temporal nas emissões resultantes. Em nossa análise destas explosões estudamos os espectros girossincrotrônicos da emissão gradual, a qual associamos provir do topo dos arcos magnéticos e da emissão de variação rápida associada aos elétrons em precipitação. Estes espectros foram calculados e dos quais inferimos que a indução magnética efetiva do topo e dos pés foi em média, Btopo = 236 G e Bpés = 577 G, inferidas das freqüências de pico dos espectros em ntopo = 11,8 GHz e npés = 14,6 GHz com leve anisotropia (pequeno alargamento espectral). O índice espectral da distribuição não-térmica de elétrons d, inferido do índice espectral de fótons da emissão em regime opticamente fino, foi de dtopo = 3,3 e dpés = 3,9. Estes parâmetros são típicos da maioria das análises realizadas em ambiente único de emissão e a relação dos índices espectrais, dpés > dtopo prioriza as interpretações com difusão em ângulo de passo devida a colisões Coulombianas. Nesta difusão o déficit de elétrons energéticos na precipitação seria uma conseqüência natural da dependência em e-3/2 das colisões elétron-próton (onde e é a energia dos elétrons).

  16. População nuclear e extranuclear em rádio-galáxias

    NASA Astrophysics Data System (ADS)

    Raimann, D. I.; Storchi-Bergmann, T.; Quintana, H.; Alloin, D.; Hunstead, R.; Wisotzki, L.

    2003-08-01

    A natureza do contínuo UV/ótico em rádio-galáxias é muito importante para o seu entendimento. Em baixos redshifts existem evidências de que muitas delas são dominadas no ótico por luz de estrelas velhas, características de galáxias early-type e em altos redshifts a característica dominante é um excesso de luz no UV, freqüentemente associado com estruturas que estão alinhadas aos eixos das estruturas rádio em grande escala. Inicialmente esse excesso foi interpretado como devido a episódios intensos de formação estelar nas galáxias hospedeiras. Entretanto, as descobertas dos alinhamentos entre as estruturas UV e rádio modificaram essa idéia. Foi proposto que a formação estelar é iniciada pela passagem do jato rádio através do meio interestelar das galáxias hospedeiras. A natureza do excesso UV começou a ser compreendida em um estudo detalhado do continuo ótico da 3C321, onde se concluiu que o contínuo desta galáxia tem origem multicomponente, com contribuições de populações velhas e intermediárias, de luz espalhada oriunda de um quasar obscurecido e do contínuo nebular. No presente trabalho estudamos a população nuclear e extranuclear de uma amostra de 24 rádio-galáxias, utilizando espectros óticos de fenda longa, com alta razão sinal/ruído. Através do método de síntese espectral de populações estelares, foram estimadas as contribuições de populações estelares de diferentes idades (e de um contínuo tipo lei de potência devido a um AGN, FC) para a luz integrada das galáxias, em 4020Å. As principais conclusões deste trabalho são: apenas quatro dos objetos estudados têm contribuições significativas (maiores do que 10%) das populações de 100 milhões de anos ou mais jovens (ou de FC) ao longo da região espacial estudada (6 kpc centrais); nenhuma das rádio-galáxias de tipo FRI estudadas tem contribuição significativa destas populações ao longo desta região; duas (de oito) de tipo FRII tem contribuições significativas da luz que vem do AGN, na região nuclear; uma tem contribuição significativa das populações de 100 milhões de anos e mais jovens ao longo dos 4 kpc centrais, indicando claramente a presença de formação estelar recente. Comparando estes resultados com aqueles obtidos para uma amostra de galáxias não ativas de mesmo tipo de Hubble das rádio, encontramos que a principal diferença entre as duas amostras está na contribuição da população de 1 bilhão de anos, geralmente maior nas rádio-galáxias.

  17. Determination and characterization of oxy-naphthenic acids in oilfield wastewater.

    PubMed

    Wang, Beili; Wan, Yi; Gao, Yingxin; Yang, Min; Hu, Jianying

    2013-08-20

    Oxy-naphthenic acids (oxy-NAs) are one of the major components of NA mixtures in wastewaters from petroleum industries. The limited available data indicated that oxy-NAs were considered as a potential marker for the degradation of NAs, and some oxy-NAs exhibited endocrine disrupting activities. However, the lack of information on the structures and occurrences of oxy-NAs in oilfield wastewaters limited the interpretations of the biotransformation pathways of NAs and structure-specific toxicity. A sensitive method for simultaneous determination of oxy-NAs together with NAs was developed by combining MAX extraction column and UPLC-ESI(-)-QTOF-MS. The 2000-fold SPE preconcentration step was highly specific for acids and the prewash solvent greatly reduced matrix effects in the UPLC-ESI(-)-QTOF-MS analysis, resulting in an increase in sensitivity down to detection limits in the ng/L range. To provide structural information within each oxy-NA isomer class, a new method was developed by derivatizing oxy-NAs with dansyl chloride by UPLC-ESI(+)-QTOF-MS. The molecular ion dansyl derivatives from the corresponding oxy-NAs and characteristic fragmentation ions, not detected before derivatization, were observed in the extracts of oilfield wastewater, providing evidence that O3-NAs and O4-NAs were mainly composed of OH-NAs and (OH)2-NAs, respectively. Semiquantification of oxy-NAs and NAs in various oilfield wastewaters revealed NAs, O3-NAs, and O4-NAs present at concentrations of 187-397, 44-146, and 40-108 ?g/L, respectively. Significantly different profiles of NA mixtures were observed in petroleum refinery wastewater and oil sands extraction water, but the profile of oxy-NAs was similar to NAs in different wastewaters suggesting the existence of biotransformation between NAs and oxy-NAs in the environment, and hydroxylation could be one of the major biotransformation pathways of NAs. PMID:23859600

  18. Suporte `a computac~ao orientada aos grupos em sistemas distribuidos tolerantes a faltas

    E-print Network

    Rodrigues, Luís E.T.

    redes de grande escala geogr´afica. Estas redes destinguem-se das redes locais principalmente pelas suas desempenho aceit´avel sobre este tipo de redes. A grande maioria das redes de grande-escala hoje existentes s~ao constitu´idas por aglomerados de redes locais interligados por redes ponto-a-ponto. Para oferecer comunicac

  19. N-Acetylserotonin and Aging-Associated Cognitive Impairment and Depression

    PubMed Central

    Oxenkrug, Gregory; Ratner, Rebbie

    2012-01-01

    Normal brain aging is associated with depression and cognitive decline. One of the mechanisms of aging-associated emotional and cognitive impairment might be the down-regulation of biosynthesis of N-acetylserotonin (NAS), one of the methoxyindole derivatives of tryptophan (TRP). Aging is associated with decreased NAS production, largely resulting from the down-regulation of beta 1 adrenoreceptors that activate serotonin N-acetyltransferase, the enzyme catalyzing formation of NAS from serotonin. NAS exerts antidepressant-like and cognition-enhancing effects. The NAS role in cognition supported by the discovery that scotophobin, decapeptide extracted from brain and associated with cognition improvement, inhibits NAS conversion into melatonin. Furthermore, NAS (and its derivatives) attenuated cognitive impairment induced by cholinergic neurotoxin and protected against beta-amyloid neurotoxicity. Considering that NAS (but not serotonin or melatonin) is a potent agonist to high-affinity BDNF tyrosine kinase (TrkB) receptors, antidepressant and cognition-enhancing effect of NAS might be mediated by activation of TrkB receptors. NAS and TRkB gradually decreased from 1 postnatal week becoming undetectable in the brains of old rats. Additional mechanisms might include non-receptor mediated anti-inflammatory and anti-oxidative effects of NAS. Therapeutic antidepressant and cognition-improving interventions might include administration of NAS and its analogs; inhibition of tryptophan - kynurenine metabolism to increase serotonin availability as a substrate for NAS biosynthesis; up-regulation of NAS formation from serotonin and down-regulation of NAS conversion into melatonin. PMID:23185714

  20. MELLO, M. P.; PETERNELLI, L. A.; LEITE, M. S. O. Anlise com e sem uso de funes polinomiais no ajuste espacial de dados nas etapas iniciais de programas de seleo comparao via simulao. In: Reunio Anual da Regio Brasileira da Sociedade

    E-print Network

    Hammerton, James

    ou não o uso de funções polinomiais para ajuste da variabilidade espacial em experimentos de campo necessário para a realização do experimento (DUARTE, 2000; MATSUOKA et al., 1999). Nesse contexto, é repetição de cada novo genótipo em experimentos segundo o Delineamento Aumentado (FEDERER, 1956

  1. A Aplicação e o Conceito de Raça em Saúde Pública: Definições, Controvérsias e Sugestões para Uniformizar sua Utilização nas Pesquisas Biomédicas e na Prática Clínica The Concept of Race in Public Health: Definitions, Controversies and Recommendations to Improve Its Use in Biomedical Research and Clinical Practice

    Microsoft Academic Search

    Crésio Alves; Cristina M. M. Fortuna; Maria Betânia; P. Toralles

    2005-01-01

    A categorização dos seres humanos em raça e etnia é um dos temas mais controversos e discutidos em medicina. antropologistas e geneticistas acreditam que, do ponto de vista biológico, raças humanas não existem. Para eles, raça é um construto social (baseado em características físicas) que se modifica com o tempo; e etnia um conceito que incorpora na sua definição variáveis

  2. AVALIAÇÃO DIAGNÓSTICA DA LAPAROSCOPIA ASSOCIADA À ANÁLISE DO LÍQUIDO INTRAPERITONEAL NAS LESÕES INTRA-ABDOMINAIS PROVOCADAS POR ARMA DE AR COMPRIMIDO: ESTUDO EXPERIMENTAL EM CÃES EVALUATION OF DIAGNOSTIC LAPAROSCOPY COMBINED WITH THE ANALYSIS OF INTRAPERITONEAL LIQUID IN PENETRAITING ABDOMINAL TRAUMA INJURIES CAUSED BY SHOTGUN: AN EXPERIMENTAL STUDY IN DOGS

    Microsoft Academic Search

    Cássio Renato; Montenegro de Lima

    RESUMO: Avaliação de eficácia da laparoscopia, associada à análise bacteriológica do líquido intraperitoneal pela coloração de Gram., no diagnóstico de lesões intra-abdominais provocadas em cães com arma de ar comprimido. A alta incidência de óbitos como resultado de ferimentos por arma de fogo tem contribuído para implantação de novas técnicas diagnósticas. O uso crescente de laparoscopia diagnóstica em urgências torna

  3. Long-time numerical computation of wave-type solutions driven by moving sources ? ? This work was supported by the National Aeronautics and Space Administration under NASA Contract No. NAS1-97046, and by Director's Discretionary Fund, while the first and second authors were in residence at ICASE, NASA Langley Research Center, Hampton, VA, USA

    Microsoft Academic Search

    V. S. Ryaben'kii; S. V. Tsynkov; V. I. Turchaninov

    2001-01-01

    We propose a methodology for calculating the solution of an initial-value problem for the three-dimensional wave equation over arbitrarily long time intervals. The solution is driven by moving sources that are compactly supported in space for any particular moment of time; the extent of the support is assumed bounded for all times. By a simple change of variables the aforementioned

  4. Fotometria diferencial de estrelas T Tauri

    NASA Astrophysics Data System (ADS)

    Pereira, P. C. R.; Santos-Júnior, J. M.; Cruz, W. S.

    2003-08-01

    Neste trabalho apresentamos os resultados preliminares de um monitoramento de estrelas jovens, que pretende ser de longa duração. As estrelas estão em sua maioria localizadas no complexo Lupus-Scorpius. Nosso objetivo principal é o estudo da variabilidade em escalas de tempo de minutos até vários dias para estrelas cujos períodos não estão determinados ou apresentam discrepâncias entre diferentes publicações. A técnica utilizada foi a fotometria diferencial, com exposições de 60s e 90s, com as câmaras CCD SBIG ST7E e ST8E acopladas aos telescópios Schmidt-Cassegrain LX200 (10 e 12 polegadas), instalados na Fundação Planetário da Cidade do Rio de Janeiro. Os primeiros resultados indicam que a técnica é bastante sólida com relação à instabilidade na transparência do céu, mesmo com o uso de telescópios de pequeno porte. Objetos de magnitude 14, no telescópio de 10 polegadas, apresentam dispersões na diferença de magnitudes das comparações, em torno de 0,008mag nas exposições de 60s. Note-se, ainda, que a dispersão pode ser melhorada utilizando-se a técnica de soma de imagens. Destacamos AK Sco, GW Lup, GQ Lup e TW Hya. AK Sco é uma binária que, apesar de ter a sua órbita e período cobertos espectroscopicamente (13,6dias), nunca teve seus eclipses estudados por meio de fotometria. GW Lup não tem período determinado na literatura. Temos acompanhado este objeto há alguns anos, e sugestões de períodos entre 5 e 6 dias têm sido encontradas. O objeto que mereceu maior atenção foi TW Hya por apresentar vários trabalhos fotométricos e espectroscópicos com resultados discrepantes quanto ao período rotacional, que varia de 1,8 a 4,4 dias (Rucinsky & Krautter 1983, A&A 121, 217; Herbst & Koret 1988, AJ 96, 1949; Mekkaden 1988, A&A 340, 135; Batalha et al. 2002, ApJ 580, 343). Dedicamos 13 noites para essa estrela, totalizando cerca de 2.000 pontos na curva de luz. Nossos dados indicam a presença de uma modulação com dois períodos possíveis: 2,2 ou 3,8 dias, além de variações irregulares superpostas. Foram observados, também, dois eventos súbitos, espaçados de uma hora, com amplitudes de 0,05mag e duração de aproximadamente 30 minutos. Admitindo-se que tal modulação seja originada por acréscimo sobre a superfície estelar, dois cenários são possíveis. No caso do menor período, apenas uma mancha quente seria visível. No outro caso, duas manchas seriam necessárias, explicando assim a presença de dois picos ao se colocar os pontos em fase.

  5. CIGACENTRO DE INVESTIGACIONES EN GEOGRAFA AMBIENTAL

    E-print Network

    Islas, León

    CIGACENTRO DE INVESTIGACIONES EN GEOGRAFÍA AMBIENTAL U N A M PONENCIAS MAGISTRALES: "La información (Assessment soil functions Centro de Investigaciones en Geografía Ambiental UNAM Campus Morelia Antigua Ambiental "Evaluación del territorio para objetivos y escalas múltiples" Centro de Investigaciones en

  6. Synthesis Paper Interactions Between Soil Erosion Processes and Fires: Implications for the Dynamics

    E-print Network

    D'Odorico, Paolo

    . Se ha demostrado con un nu´mero de estudios en tu´neles de viento, experimentos manipulados a nivel escala-campo, con quemas controladas, y mediciones micro topogra´ficas; y estudios con trazadores de

  7. Estudio de Exámenes de Detección de Cáncer de Próstata, Pulmón, Colorrectal y Ovarios (PLCO): preguntas y respuestas

    Cancer.gov

    El estudio de exámenes de detección PLCO es un estudio a gran escala, aleatorizado, para determinar si el uso de ciertos exámenes selectivos de detección disminuirá el riesgo de morir por esos cuatro tipos de cáncer.

  8. Nanotecnología - Duration: 30 seconds.

    NASA Video Gallery

    Piensa en pequeño. No, más pequeño -- piensa en nano. Achícate a la "nano escala", podrías ver los átomos que forman todo Y poder moverlos. Los científicos especialistas en nanotecnología crean nue...

  9. UNIVERSIDAD SIMON BOLIVAR Divisin de Fsica y Matemticas

    E-print Network

    Vásquez, Carlos

    aplicaciones que se derivan de todos estos conceptos como por ejemplo la física de los diferentes instrumentos musicales, el tono de un instrumento, las escalas, las ondas estacionarias en los instrumentos de cuerda, de

  10. Parlamento de Martn Haro Berois, graduado del Mster en Tecnologas de la informacin, la comunicacin y los medios

    E-print Network

    Geffner, Hector

    regalo ideal para mí). En Uruguay, mi país de origen, aprendí a tocar algunos instrumentos musicales funcionamiento de los instrumentos o el porqué de la teoría musical que pasar horas y horas ejecutando escalas o

  11. Instantánea de nanotecnología

    Cancer.gov

    Resumen básico de la nanotecnología, la cual consiste en el diseño y la creación de dispositivos tan pequeños que solo pueden medirse a escala molecular. También se incluye información sobre las investigaciones que realiza el NCI en este campo.

  12. Volumen LXX N 266 enero-junio 2009 Madrid (Espaa) ISSN:0014-1496 Geogrficos

    E-print Network

    Borsdorf, Axel

    Fondecyt 1030472 y 1060759 y de Cooperación Internacional 7080114. #12;comunicación y la promesa del centrales (comercio en gran escala y minorista, servicios e instituciones de en- señanza) se establecen en

  13. Ames Director William 'Bill' Ballhaus (center left) joins visitor Sir Jeffrey Pope from Royla

    NASA Technical Reports Server (NTRS)

    1986-01-01

    Ames Director William 'Bill' Ballhaus (center left) joins visitor Sir Jeffrey Pope from Royla Aircraft Industry, England (center right) at the NAS Facility Cray 2 computer with Ron Deiss, NAS Deputy Manager (L) and Vic Peterson, Ames Deputy Director (R).

  14. Copyright notice: this article has been accepted to the PowerTech 2013 conference (http://powertech2 13. grenoble-inp.fr). Copyright may be transferred without notice to IEEE.

    E-print Network

    Paris-Sud XI, Université de

    ://powertech2 13. grenoble-inp.fr). Copyright may be transferred without notice to IEEE. Aging-aware NaS battery. A thermo- electrical model for Sodium Sulfur (NaS) batter- ies reproduces key characteristics

  15. Gene Variants Reduce Opioid Risks

    MedlinePLUS

    ... reduced severity of neonatal abstinence syndrome (NAS) in newborns who were prenatally exposed to methadone or buprenorphine. ... gene to reduced severity of NAS. Among 86 newborns who were prenatally exposed to buprenorphine or methadone, ...

  16. 36 CFR 1234.30 - How does an agency request authority to establish or relocate records storage facilities?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Forests, and Public Property NATIONAL ARCHIVES AND RECORDS ADMINISTRATION RECORDS...Management Division (NAS), National Archives and Records Administration, 8601 Adelphi...Management Division (NAS), National Archives and Records Administration, 8601...

  17. 36 CFR 1234.10 - What are the facility requirements for all records storage facilities?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...Forests, and Public Property NATIONAL ARCHIVES AND RECORDS ADMINISTRATION RECORDS...Management Division (NAS), National Archives and Records Administration, 8601 Adelphi...Management Division (NAS), National Archives and Records Administration, 8601...

  18. Identification of Communication and Coordination Issues in the U. S. Air Traffic Control System

    E-print Network

    Davison, Hayley

    Today’s air traffic control system is approaching the point of saturation, as evidenced by increasing delays across the National Airspace System (NAS). There exists an opportunity to enhance NAS efficiency and reduce ...

  19. Data Multiplexing Network (DMN), phase 3: Equipment Operational Test and Evaluation (OT&E)\\/Integration test plan

    Microsoft Academic Search

    Wayne Bell

    1991-01-01

    The presented plan addresses the Operational Test and Evaluation (OT&E)\\/Integration testing of the Data Multiplexing Network (DMN) equipment in the current NAS environment. The approach and concept is to conduct integration tests with appropriate National Airspace System (NAS) systems to verify that NAS requirements and DMN specifications and Statistical Multiplexer requirements were satisfied. This will be accomplished by conducting unit

  20. 76 FR 26290 - Science Advisory Board Staff Office; Notification of a Public Teleconference of the Chartered...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-06

    ...Reanalysis of Key Issues Related to Dioxin Toxicity and Response to NAS Comments.'' DATES...Reanalysis of Key Issues Related to Dioxin Toxicity and Response to NAS Comments.'' The...Reanalysis of Key Issues Related to Dioxin Toxicity and Response to NAS Comments.''...

  1. Intrinsic Job Satisfaction, Overall Satisfaction, and Intention to Leave the Job among Nursing Assistants in Nursing Homes

    ERIC Educational Resources Information Center

    Decker, Frederic H.; Harris-Kojetin, Lauren D.; Bercovitz, Anita

    2009-01-01

    Purpose: We examined predictors of intrinsic job satisfaction, overall satisfaction, and intention to leave the job among nursing assistants (NAs). Design and Methods: The study focused on NAs who worked 30 or more hours per week in a nursing home. Data on 2,146 NAs meeting this criterion came from the 2004 National Nursing Assistant Survey, the…

  2. Pluralizing the Monoculture

    ERIC Educational Resources Information Center

    Balch, Stephen H.

    2007-01-01

    The National Association of Scholars (NAS) is now entering its twentieth year. The organization has grown over ten-fold since their national launch. When NAS made its debut, today's extensive infrastructure for higher education reform did not yet exist. In this article, the author discusses the contributions of NAS to the academe. The author also…

  3. Fractionation of oil sands-process affected water using pH-dependent extractions: A study of dissociation constants for naphthenic acids species.

    PubMed

    Huang, Rongfu; Sun, Nian; Chelme-Ayala, Pamela; McPhedran, Kerry N; Changalov, Mohamed; Gamal El-Din, Mohamed

    2015-05-01

    The fractionation of oil sands process-affected water (OSPW) via pH-dependent extractions was performed to quantitatively investigate naphthenic acids (NAs, CnH2n+ZO2) and oxidized NAs (Ox-NAs) species (CnH2n+ZO3 and CnH2n+ZO4) using ultra-performance liquid chromatography time-of-flight mass spectrometry (UPLC-TOFMS). A mathematical model was also developed to estimate the dissociation constant pKa for NAs species, considering the liquid-liquid extraction process and the aqueous layer acid-base equilibrium. This model provides estimated dissociation constants for compounds in water samples based on fractionation extraction and relative quantification. Overall, the sum of O2-, O3-, and O4-NAs species accounted for 33.6% of total extracted organic matter. Accumulative extracted masses at different pHs revealed that every oxygen atom added to NAs increases the pKa (i.e., O2-NAsNAsNAs), indicating that the additional O atoms exist as -OH in O3- and O4-NAs. Molecule electron-withdrawing groups such as double bonds and aromatic groups, as indicated by higher carbon and -Z number, may be responsible for the lower pKa of O2-, O3-, and O4-NAs. The model obtained estimated pKa values of 3.5 for O2-NAs, 4.8 for O3-NAs, and 6.8 for O4-NAs via nonlinear regression curve fittings. These pKa values are valuable physicochemical parameters for environmental engineering applications targeting OSPW NAs treatment. PMID:25782756

  4. Deforestation and Biogenic Trace Emissions from Brazilian Cerrado

    NASA Technical Reports Server (NTRS)

    Sinha, Ravi; Geol, P.

    1996-01-01

    The overall goal of NASA's SCAR (Smoke, Cloud and Radiation) Program is to obtain physical and chemical properties of the smoke produced by biomass burning and the effects of the smoke on the earth's radiation balance and climate. It is a joint project with the Brazilian government and their organizations, including INPE (Instituto Nacional Pesquisas Espaciais) who actively participate in all activities. Appropriate estimates of the biomass buming in the tropics is therefore essential to determine its effect on the atmosphere and on climate. The SCAR series of experiments is designed with that purpose. The present study of evaluating the burnt-out areas is to augment the data collected to date to help evaluate the effect of biomass burning.

  5. Determinação de regiões de órbitas diretas estáveis ao redor da Lua

    NASA Astrophysics Data System (ADS)

    de Melo, C. F.; Winter, O. C.; Vieira Neto, E.

    2003-08-01

    Neste Trabalho estamos investigando regiões do sistema Terra-Lua que contêm órbitas diretas estáveis ao redor da Lua visando a utilização destas órbitas em futuras missões de veículos espaciais como alternativas de trajetórias com baixo custo de manutenção. Adotando-se o problema restrito de três corpos, Terra-Lua-partícula, a localização e a extensão destas regiões de estabilidade foram investigadas numericamente considerando como estável toda órbita que permanece ao redor a Lua por, no mínimo, 1000 dias com energia de dois corpos da partícula em relação à Lua negativa. A estabilidade de tais regiões está associada a duas famílias de órbitas periódicas simples H1 e H2 e a órbitas quase-periódicas associadas a elas. Uma vez identificadas as regiões de estabilidade passamos a analisá-las introduzindo, paulatinamente, outras interações relevantes ao sistema como as perturbações do Sol (via problema restrito de quatro corpos), das marés, da pressão de radiação e do achatamento terrestre. Os resultados encontrados até o momento mostram que a perturbação do Sol é a única que reduz significativamente o tamanho das regiões de estabilidade. Também estamos investigando o comportamento de tais regiões quando características intrínsecas do sistema como as excentricidades das órbitas da Terra e da Lua e a inclinação da órbita Lua são consideradas. Com este estudo estamos reunindo informações que nos permitirão compreender a evolução das regiões de estabilidade no sistema Terra-Lua, bem como estabelecer parâmetros adequados para a utilização das trajetórias estáveis em futuras missões espaciais. Agradecimentos: Este projeto conta com o apoio do CNPq, da Capes e da Fapesp.

  6. Review of the assessment and management of neonatal abstinence syndrome

    PubMed Central

    2014-01-01

    Neonatal abstinence syndrome (NAS) secondary to in-utero opioid exposure is an increasing problem. Variability in assessment and treatment of NAS has been attributed to the lack of high-quality evidence to guide management of exposed neonates. This systematic review examines available evidence for NAS assessment tools, nonpharmacologic interventions, and pharmacologic management of opioid-exposed infants. There is limited data on the inter-observer reliability of NAS assessment tools due to lack of a standardized approach. In addition, most scales were developed prior to the prevalent use of prescribed prenatal concomitant medications, which can complicate NAS assessment. Nonpharmacologic interventions, particularly breastfeeding, may decrease NAS severity. Opioid medications such as morphine or methadone are recommended as first-line therapy, with phenobarbital or clonidine as second-line adjunctive therapy. Further research is needed to determine best practices for assessment, nonpharmacologic intervention, and pharmacologic management of infants with NAS in order to improve outcomes. PMID:25199822

  7. Artificial sweeteners induce glucose intolerance by altering the gut microbiota.

    PubMed

    Suez, Jotham; Korem, Tal; Zeevi, David; Zilberman-Schapira, Gili; Thaiss, Christoph A; Maza, Ori; Israeli, David; Zmora, Niv; Gilad, Shlomit; Weinberger, Adina; Kuperman, Yael; Harmelin, Alon; Kolodkin-Gal, Ilana; Shapiro, Hagit; Halpern, Zamir; Segal, Eran; Elinav, Eran

    2014-10-01

    Non-caloric artificial sweeteners (NAS) are among the most widely used food additives worldwide, regularly consumed by lean and obese individuals alike. NAS consumption is considered safe and beneficial owing to their low caloric content, yet supporting scientific data remain sparse and controversial. Here we demonstrate that consumption of commonly used NAS formulations drives the development of glucose intolerance through induction of compositional and functional alterations to the intestinal microbiota. These NAS-mediated deleterious metabolic effects are abrogated by antibiotic treatment, and are fully transferrable to germ-free mice upon faecal transplantation of microbiota configurations from NAS-consuming mice, or of microbiota anaerobically incubated in the presence of NAS. We identify NAS-altered microbial metabolic pathways that are linked to host susceptibility to metabolic disease, and demonstrate similar NAS-induced dysbiosis and glucose intolerance in healthy human subjects. Collectively, our results link NAS consumption, dysbiosis and metabolic abnormalities, thereby calling for a reassessment of massive NAS usage. PMID:25231862

  8. Astrofsica Extragalctica y Cosmologa. Problemas y preguntas clave I.

    E-print Network

    Aretxaga, Itziar

    densidad crítica del universo? 17. ¿Qué es un universo Einstein-de Sitter? 18. Dada la ecuación de parámetros cosmológicos favorecidos en la actualidad? 21. ¿Cómo se escala la densidad de materia con la expansión del universo? ¿por qué? 22. ¿Cómo se escala la densidad de radiación con la expansión del universo

  9. Newly graduated nurse anesthetists' experiences and views on anesthesia nursing--a phenomenographic study.

    PubMed

    Mauleon, Annika Larsson; Ekman, Sirkka-Liisa

    2002-08-01

    This qualitative study identifies and describes different ways in which newly graduated nurse anesthetists (NAs) experience and perceive nurse anesthesia. It explains different approaches to nurse anesthesia care and, thus, to clinical nursing care (in an anesthesia and surgical context), provided by new NAs. One month after graduation, all NAs who had completed an anesthesia nursing program responded to 4 open-ended questions. A phenomenographic method was used to analyze their responses. The results were divided into 3 categories, which describe nurse anesthesia from the perspectives of (1) maintaining physical well-being; (2) being protectors and advocates; and (3) ability to perform good nurse anesthesia given all the demands placed on the NAs. The results indicate that, for the new NAs, the nurse anesthesia care situation was largely influenced by context and generated feelings of inadequacy because the NAs could not provide the emotional support that they believed their patients required. PMID:12242926

  10. A derivatisation and liquid chromatography/electrospray ionisation multistage mass spectrometry method for the characterisation of naphthenic acids.

    PubMed

    Smith, B E; Rowland, S J

    2008-12-01

    Naphthenic acids (NAs) are partially uncharacterised complex mixtures of carboxylic acids, resulting from the microbial oxidation of petroleum hydrocarbons. They are associated with the fouling of pipelines and process equipment in oil production and with corrosion in oil refineries. As by-products of the rapidly expanding oil (tar) sands industries, NAs are also pollutants and have proved to be toxic to a range of organisms. They also have important beneficial uses as fungicides, tyre additives and, paradoxically, also in the manufacture of corrosion inhibitors. These features make the characterisation of NAs an important goal for analytical chemists. Here we describe the synthesis of amide derivatives of NAs for characterisation by liquid chromatography/electrospray ionisation multistage mass spectrometry (LC/ESI-MS(n)). The method was applied to commercially available carboxylic acids, novel synthetic NAs, commercial NAs refined from crude oils, crude oil NAs and Athabasca oil sands NAs. In addition to confirming the number of alicyclic rings and length of alkyl side chain substituents (confirming information from existing methods), the MS(n) results provided further structural information. Most important of these was the finding that bi- to polycyclic acids containing ethanoate side chains, in addition to alkyl substituents, were widespread amongst the oil and oil sands NAs. The latter NAs are known end members of the beta-oxidation of NAs with even carbon number alkanoate chains. Since such NA mixtures are toxic, they should be targets for bioremediation. Bioremediation of NAs can also be monitored better by application of the methods described herein. PMID:18988206

  11. The Native American Studies Program at the University of Oklahoma

    E-print Network

    Kidwell, Clara Sue

    2001-03-01

    The Native American Studies Program at The University of Oklahoma Clara Sue Kidwell The Native American Studies (NAS) program at the University of Okla homa was approved by the State Regents for Higher Education in January of 1994..., and Music departments together with a group of courses offered under the NAS program rubric. The NAS courses include Tribal Sovereignty, Tribal Educational Policy, and Tribal Economic Development. The program has three full-time staff members: Dr. Clara...

  12. Nonaudit Services and Earnings Conservatism: Is Auditor Independence Impaired?

    Microsoft Academic Search

    CAITLIN RUDDOCK; SARAH J. TAYLOR; STEPHEN L. TAYLOR

    2006-01-01

    We examine whether the provision of nonaudit services (NAS) by incumbent auditors is associated with a reduction in the extent to which earnings reflect bad news on a timely basis (that is, news-based conservatism). Reduced conservatism is expected to occur if relatively high levels of NAS result in reduced auditor independence and, ultimately, lower-quality auditing. Because client-specific demand for NAS

  13. 2001 The Paleontological Society. All rights reserved. 0094-8373/01/2701-0003/$1.00 Paleobiology, 27(1), 2001, pp. 1438

    E-print Network

    Blob, Richard W.

    specimens and experimental data from force platform experiments on igua- nas and alligators. Experimental in sprawling locomotion can reduce peak bending stresses. Therefore, as experimental data from alligators

  14. School of Science Quick Facts

    E-print Network

    Linhardt, Robert J.

    and Accelerator Spectrometry Peter Fox Professor and tetherless World Constellation Chair Solar and solar-terrestrial, tectonics Bruce Watson nas, institute Professor Transport properties, numerical modeling

  15. Feeding Modalities and the Onset of the Neonatal Abstinence Syndrome

    PubMed Central

    Liu, Anthony; Juarez, Jaime; Nair, Ajitha; Nanan, Ralph

    2015-01-01

    Breast milk has been reported to ameliorate the severity and outcome of neonatal abstinence syndrome (NAS). The mechanism of this beneficial effect of breast milk on NAS remains unclear, as the negligible amount of methadone transmitted via breast milk is unlikely to have an impact on NAS. The aim of this study was to compare the impact of different feeding modalities on the onset of NAS. A retrospective medical record review was conducted on 194 methadone-maintained mother/infant dyads. Infants were categorized on the first 2?days of life as predominantly breastfed, fed expressed human breast milk (EBM), or formula fed. The feeding categories were then analyzed using the onset of NAS as the outcome measure. After adjusting for confounders, there was no significant effect of the modality of feeding on the rates of NAS requiring treatment (p?=?0.11). Breastfeeding significantly delayed the onset of NAS (p?=?0.04). The act of breastfeeding in the first 2?days of life had no effect on whether an infant required treatment for NAS when compared to those fed EBM or formula. This only suggests that the advantages of breastfeeding on NAS cannot be substantiated in a small cohort and should not discourage breastfeeding.

  16. UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL INSTITUTO DE FSICA

    E-print Network

    dos Santos, C.A.

    refração. Estudo de espelhos e lentes delgadas. Instrumentos ópticos. Unidade III 1. Interferência fazem parte do Conteúdo Programático e serão exigidos nas verificações (veja Instrumentos de Avaliação

  17. (12) United States Patent Crain et al.

    E-print Network

    Chen, Chuan-Hua

    identification, packaging flexible electronic devices (such as those that can be rolled or bent), photovoltaic devices, medical and diagnostic devices, anten- nas (including RFID antennas), displays, sensors, thin

  18. Toward nanoanalytical chemistry: case of nanomaterial integration into [bio]sensing systems

    Microsoft Academic Search

    Arben Merkoçi; Salvador Alegret i Sanromà

    2005-01-01

    La nanotecnologia orientada al camp de la química analítica, o química nanoanalítica, ja sigui a escala nanomètrica o a macroescala, s'està convertint en una matèria de gran potencial. Els conceptes associats a aquesta química nanoanalítica són acceptats ràpidament, entre d'altres, pel camp de la biologia molecular. El disseny de noves estructures amb propietats òptiques i electroquímiques especials i la seva

  19. SciMulator: Um Ambiente de Simulao de Workflows Cientficos em Redes P2P*

    E-print Network

    Paris-Sud XI, Université de

    SciMulator: Um Ambiente de Simulação de Workflows Científicos em Redes P2P* Jonas Dias1 , Carla networks. Resumo. O crescimento dos experimentos científicos em larga escala motiva a busca por ambientes paradigma Many Task Computing (MTC). Ambientes Peer-to-Peer (P2P) podem atender esta demanda, pelo fácil

  20. Reconocimiento robusto de marcadores artificiales para la navegacion de robots

    E-print Network

    Escolano, Francisco

    cambios de escala. Los experimentos demuestran que nuestra soluci´on es r´apida y muy robusta incluso en Introducci´on Dentro del campo de investigaci´on dedicado a la navegaci´on de robots, son mu- chos los experimentos. 2 Histogramas polares Los histogramas polares son definidos como un medio para comparar s

  1. Estudio del NCI revela que la obesidad extrema puede acortar la esperanza de vida hasta en 14 años

    Cancer.gov

    Los adultos con obesidad extrema tienen un mayor riesgo de morir a una edad más joven debido al cáncer y a muchas otras causas entre ellas, enfermedades cardíacas, accidentes cerebrovasculares, diabetes y enfermedades del hígado y los riñones, según los resultados de un análisis de datos de 20 estudios a gran escala realizados en personas de tres países.

  2. Caracterización y selección del lugar de nidificación de la grulla cubana (Grus canadensis nesiotes) en los herbazales del Refugio de Fauna El Venero, Cuba

    Microsoft Academic Search

    Y. Ferrer Sánchez; D. Denis Ávila; I. Ruiz Companioni

    2010-01-01

    Grus canadensis nesiotes es una subespecie endémica y amenazada de grulla cuyas poblaciones están asociadas a humedales de agua dulce. En este trabajo se caracterizó su lugar de nidificación y se determinó su selección a tres escalas espaciales en los herbazales del Refugio de Fauna El Venero, Cuba, durante los años 2005–2007. Se monitorizaron 26 nidos hasta la eclosión. También

  3. Sesso Especial: Novas Tendncias em Modelagem do Sistema Terrestre (New Trends on Land System Modelling) Coordenadores: Gilberto Cmara (INPE) e Giovana Espindola (IPO-GLP/INPE)

    E-print Network

    Sessão Especial: Novas Tendências em Modelagem do Sistema Terrestre (New Trends on Land System múltipla escala, obteremos novas informações sobre os processos que comandam as mudanças do sistema

  4. UNA PROPUESTA METODOLÓGICA PARA ANALIZAR PROYECTOS FORESTALES DE CAPTURA DE CARBONO EN CUANTO AL APORTE AL DESARROLLO SOSTENIBLE

    Microsoft Academic Search

    Edgar Moreno Castillo

    2011-01-01

    El presente artículo tuvo como objetivo comparar metodologías de análisis desde los sistemas complejos que involucraran elementos sociales y naturales en interacción entre sí y a diferentes escalas, para ser aplicadas en el estudio de proyectos forestales de captura de carbono. Este tipo de proyectos se denominan mecanismos de mitigación al cambio climático, clasificados dentro del Mecanismo de Desarrollo Limpio

  5. Relative abundance of amphibians in forest canopy gaps of natural origin vs. timber harvest origin

    Microsoft Academic Search

    C. Stronjny; M. L. Hunter

    2010-01-01

    Los claros a pequeña escala producidos en el dosel forestal por la industria maderera pueden conservar una estructura del hábitat apropiada para mantener la abundancia de anfibios. Utilizamos trampas con vallas de intercepción para medir la abundancia relativa de anfibios en 44 claros en que la madera había sido cortada, 19 claros naturales producidos por la caída de los árboles,

  6. Caracterización de tintas de titanio dopadas con óxidos metálicos

    Microsoft Academic Search

    C. R. TUBÍO; F. GUITIÁN; A. GIL

    Se prepararon tintas de Diisopropoxido de titanio bis(acetilacetonato) por el método sol-gel para aplicar en la elaboración de nanoestructuras mediante la técnica de escritura directa. Esta técnica permite estructurar materiales con alto índice de refracción a escala micro y nanométrica en tres dimensiones mediante extrusión, para elaborar cristales fotónicos. El tratamiento de las nanoestructuras extruidas a temperaturas elevadas para transformarlas

  7. Disposal: Science and Theory UNIVERSIDAD

    E-print Network

    Benson, Eric R.

    despoblaron masivamente. ­ Se utilizaron dos sistemas de espuma de aire comprimido (CAFS, por sus siglas en comparación a gran escala · Se usaron dos tecnologías de espuma: ­ Expansión intermedia ­ Generador de espuma · 2.500 pollos de engorde / tratamiento · Generador de espuma ­ Agua: 3.463 litros ­ Espuma: 34 litros

  8. ALGUNAS HERRAMIENTAS PARA LA PREVENCIÓN, CONTROL Y MITIGACIÓN DE LA CONTAMINACIÓN AMBIENTAL

    Microsoft Academic Search

    Galván Rico; Reyes Gil

    2009-01-01

    Resumen: Desde los principios de la revolución industrial se han desarrollado técnicas de producción intensivas con el empleo de sustancias peligrosas, sin considerarse el impacto de estas actividades sobre la salud del ser humano y de los ecosistemas. La humanidad se ve ahora forzada a investigar las consecuencias ambientales de sus acciones de producción a escala local, nacional y global

  9. SOMI XVIII Congreso de Instrumentación ELECTRONICA JMS1831

    Microsoft Academic Search

    J. G. Mateos; J. R. Rodríguez; J. S. Fregoso; L. Hernández

    RESUMEN: En la automatización de procesos industriales es común encontrar la medición de variables con comportamiento no lineal. Para la visualización de una variable no lineal se utilizan escalas logarítmicas. En el caso del flujo, al realizar la medición con un instrumento transmisor de presión diferencial, acoplado a una placa de orificio, el transmisor responde en forma cuadrática a la

  10. Graellsia, 62(nmero extraordinario): 523-538 (2006) * Depto. de Biodiversidad y Biologa Evolutiva, Museo Nacional de Ciencias Naturales (CSIC), Jos Gutirrez Abascal, 2; E-

    E-print Network

    Carrascal, Luis M.

    2006-01-01

    trabajo se efectúa una revisión crítica sobre la rareza ecológica, las categorí- as de amenaza de las para establecer categorías de amenaza existen numerosos problemas lógicos asociados con la conservación cate- gorías que definan el estatus de amenaza a escalas nacional o regional cuando los datos

  11. The Condor 111(2):314325 The Cooper Ornithological Society 2009

    E-print Network

    Shutler, Dave

    migratorias (Zonotrichia albicollis, Dendroica coronata y Dendroica striata) en paisajes que variaron en el (Zonotrichia albicollis), yellow-rumped warbler (Dendroica coronata), and Blackpoll warbler (Dendroica striata significativamente relacionadas con la proporción de cosecha a las tres escalas para Z. albicollis; para todas las

  12. Utilidad diagnóstica del Cuestionario TDAH y del Perfil de Atención para discriminar entre niños con tratorno por déficit de atención con hiperactividad, trastornos del aprendizaje y controles

    Microsoft Academic Search

    Juan Antonio Amador; Maria Forns; Joan Guàrdia Olmos; Maribel Peró

    2005-01-01

    Se analiza la convergencia entre la información recogida de padres y profesores, mediante escalas de valoración, y el diagnóstico clínico en una muestra de 126 niños: 42 con Trastorno por déficit de atención con hiperactividad (TDAH) tipo combinado, 21 con Trastornos del aprendizaje (TA) y 63 controles, con edades comprendidas entre los 4 y los 12 años. El grupo de

  13. aquagym fitness salsa handball tennis de table rugby rock n'roll

    E-print Network

    Jeanjean, Louis

    aquagym fitness salsa handball tennis de table rugby rock n'roll badminton volley-ball salsa zumb cuisses yoga kung fu basket-ball futsal judo aikid arts du cirque aquagym fitness salsa handball tennis de table rugby rock n'roll badminton volley-ball salsa zumb natation randonnées ski escala judo musculation

  14. Curriculum vitae -Montserrat Alonso Garca 1 / 8 CURRICULUM VITAE

    E-print Network

    South Florida, University of

    of Salamanca, Spain (January 2011). Dissertation: "Cambios climáticos a escala orbital y milenaria en el Atlántico norte entre 800.000 y 400.000 años" (Orbital and millennial-scale climate changes in the North stable isotopes, ice-rafted debris records, planktic foraminifer assemblages, and planktic foraminifer

  15. A Rede Interartística Música-Cinema-Arte Seqüencial- Literatura em The Adventures of Lucky Pierre

    Microsoft Academic Search

    Isabella Vieira de Bem

    RESUMO : Este trabalho examina o romance hiperficcional The Adven- tures of Lucky Pierre, de Robert Coover, como território interartístico no qual a escala musical serve de ponto de partida\\/fuga para o entrecruza- mento de linguagens, convenções e materialidades de outros campos ar- tísticos. Entre eles, o cinema, a arte seqüencial dos quadrinhos e a lite- ratura. A série de

  16. Iron fortification of rice seeds through activation of the nicotianamine synthase gene

    PubMed Central

    Lee, Sichul; Jeon, Un Sil; Lee, Seung Jin; Kim, Yoon-Keun; Persson, Daniel Pergament; Husted, Søren; Schjørring, Jan K.; Kakei, Yusuke; Masuda, Hiroshi; Nishizawa, Naoko K.; An, Gynheung

    2009-01-01

    The most widespread dietary problem in the world is mineral deficiency. We used the nicotianamine synthase (NAS) gene to increase mineral contents in rice grains. Nicotianamine (NA) is a chelator of metals and a key component of metal homeostasis. We isolated activation-tagged mutant lines in which expression of a rice NAS gene, OsNAS3, was increased by introducing 35S enhancer elements. Shoots and roots of the OsNAS3 activation-tagged plants (OsNAS3-D1) accumulated more Fe and Zn. Seeds from our OsNAS3-D1 plants grown on a paddy field contained elevated amounts of Fe (2.9-fold), Zn (2.2-fold), and Cu (1.7-fold). The NA level was increased 9.6-fold in OsNAS3-D1 seeds. Analysis by size exclusion chromatography coupled with inductively coupled plasma mass spectroscopy showed that WT and OsNAS3-D1 seeds contained equal amounts of Fe bound to IP6, whereas OsNAS3-D1 had 7-fold more Fe bound to a low molecular mass, which was likely NA. Furthermore, this activation led to increased tolerance to Fe and Zn deficiencies and to excess metal (Zn, Cu, and Ni) toxicities. In contrast, disruption of OsNAS3 caused an opposite phenotype. To test the bioavailability of Fe, we fed anemic mice with either engineered or WT seeds for 4 weeks and measured their concentrations of hemoglobin and hematocrit. Mice fed with engineered seeds recovered to normal levels of hemoglobin and hematocrit within 2 weeks, whereas those that ate WT seeds remained anemic. Our results suggest that an increase in bioavailable mineral content in rice grains can be achieved by enhancing NAS expression. PMID:20080803

  17. Naphthenic acids degradation and toxicity mitigation in tailings wastewater systems and aquatic environments: a review.

    PubMed

    Kannel, Prakash R; Gan, Thian Y

    2012-01-01

    Naphthenic acids, NAs (classical formula C(n)H(2n+z)O(2), where n is the carbon numbers, z represents zero or negative even integers), found in oil sands process waters (OSPWs), are toxic to aquatic environments depending upon several factors such as pH, salinity, molecular size and chemical structure of NAs. Among various available methods, biodegradation seems to be generally the most cost-effective method for decreasing concentrations of NAs (n ? 21) and reducing their associated toxicity in OSPW, however the mechanism by which the biodegradation of NAs occurs are poorly understood. Ozonation is superior over biodegradation in decreasing higher molecular weight alkyl branched NAs (preferentially, n ? 22, -6 ? z ? -12) as well as enabling accelerated biodegradation and reducing toxicity. Photolysis (UV at 254 nm) is effective in cleaving higher molecular weight NAs into smaller fragments that will be easier for microorganisms to degrade, whereas photocatalysis can metabolize selective NAs (0 ? z ? -6) efficiently and minimize their associated toxicity. Phytoremediation is applicable for metabolizing specific NAs (O(2), O(3), O(4), and O(5) species) and minimizing their associated toxicities. Petroleum coke (PC) adsorption is effective in reducing the more structurally complex NAs (preferentially 12 ? n ? 18 and z = -10, -12) and their toxicity in OSPWs, depending upon the PC content, pH and temperature. Several factors have influence on the degradation of NAs in OSPWs and aquatic environments, which include molecular mass and chemical structure of NAs, sediment structure, temperature, pH, dissolved oxygen, nutrients, and bacteria types. PMID:22217078

  18. Estimating naphthenic acids concentrations in laboratory-exposed fish and in fish from the wild.

    PubMed

    Young, Rozlyn F; Wismer, Wendy V; Fedorak, Phillip M

    2008-09-01

    Naphthenic acids (NAs) are the most water-soluble organic components found in the Athabasca oil sands in Alberta, Canada, and these acids are released into aqueous tailing waters as a result of bitumen extraction. Although the toxicity of NAs to fish is well known, there has been no method available to estimate NAs concentrations in fish. This paper describes a newly developed analytical method using single ion monitoring gas chromatography-mass spectrometry (GC-MS) to measure NAs in fish, down to concentrations of approximately 0.1mgkg(-1) of fish flesh. This method was used to measure the uptake and depuration of commercial NAs in laboratory experiments. Exposure of rainbow trout (Oncorhynchus mykiss) to 3mg NAsl(-1) for 9d gave a bioconcentration factor of approximately 2 at pH 8.2. Within 1d after the fish were transferred to NAs-free water, about 95% of the NAs were depurated. In addition, the analytical method was used to determine if NAs were present in four species of wild fish - northern pike (Esox lucius), lake whitefish (Coregonus clupeaformis), white sucker (Catostomus commersoni), walleye (Sander vitreus) - collected from near the oil sands. Flesh samples from 23 wild fish were analyzed, and 18 of these had no detectable NAs. Four fish (one of each species) contained NAs at concentrations from 0.2 to 2.8mgkg(-1). The GC-MS results from one wild fish presented a unique problem. However, with additional work it was concluded that the NAs concentration in this fish was <0.1mgkg(-1). PMID:18667226

  19. Differences in phytotoxicity and dissipation between ionized and nonionized oil sands naphthenic acids in wetland plants.

    PubMed

    Armstrong, Sarah A; Headley, John V; Peru, Kerry M; Germida, James J

    2009-10-01

    Naphthenic acids (NAs) are composed of alkyl-substituted acyclic and cycloaliphatic carboxylic acids and, because they are acutely toxic to fish, are of toxicological concern. During the caustic hot-water extraction of oil from the bitumen in oil sands deposits, NAs become concentrated in the resulting tailings pond water. The present study investigated if dissipation of NAs occurs in the presence of hydroponically grown emergent macrophytes (Typha latifolia, Phragmites australis, and Scirpus acutus) to determine the potential for phytoremediation of these compounds. Plants were grown with oil sands NAs (pKa approximately 5-6) in medium at pH 7.8 (predominantly ionized NAs) and pH 5.0 (predominantly nonionized NAs) to determine if, by altering their chemical form, NAs may be more accessible to plants and, thus, undergo increased dissipation. Whereas the oil sands NA mixture in its nonionized form was more toxic to wetland plants than its ionized form, neither form appeared to be sequestered by wetland plants. The present study demonstrated that plants may selectively enhance the dissipation of individual nonionized NA compounds, which contributes to toxicity reduction but does not translate into detectable total NA dissipation within experimental error and natural variation. Plants were able to reduce the toxicity of a NA system over 30 d, increasing the median lethal concentration (LC50; % of hydroponic solution) of the medium for Daphnia magna by 23.3% +/- 8.1% (mean +/- standard error; nonionized NAs) and 37.0% +/- 2.7% (ionized NAs) as determined by acute toxicity bioassays. This reduction in toxicity was 7.3% +/- 2.6% (nonionized NAs) and 45.0% +/- 6.8% (ionized NAs) greater than that in unplanted systems. PMID:19469588

  20. 21 CFR 520.1408 - Methylprednisolone tablets.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...2-milligram tablets. (c) NAS/NRC status. The conditions of use have been NAS/NRC reviewed and found effective. NADA's for approval of drugs for these conditions of use need not include effectiveness data specified by § 514.111 of this...

  1. 21 CFR 520.2087 - Roxarsone soluble powder.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...556.60 of this chapter. (d) NAS/NRC status . These conditions of use are NAS/NRC reviewed and found effective. NADA's for these uses need not include effectiveness data as specified by § 514.111 of this chapter, but may require...

  2. 21 CFR 520.1720b - Phenylbutazone granules.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...for 1-gram package. (c) NAS/NRC status. The conditions of use have been NAS/NRC reviewed and found effective. NADA's for approval of drugs for these conditions of use need not include effectiveness data specified by § 514.111 of this...

  3. 21 CFR 520.2088 - Roxarsone tablets.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...pigmentation claims are NAS/NRC reviewed and found effective. NADA's for these uses need not include effectiveness data as specified...These conditions are NAS/NRC reviewed and found effective. NADA's for these uses need not include effectiveness data as...

  4. ISSN n 1676-7748 REVISTA MAGIS

    E-print Network

    . A raiz do pecado social na América Latina está nas desigualdades De Medelin saiu aquela idéia forte do pecado social. A América Latina tem um pecado social e a raiz dele está nas desigualdades. João Paulo II

  5. All weather sense and avoid system (AWSAS) for all UAS and manned platforms

    Microsoft Academic Search

    V. M. Contarino; R. Healing; R. Contarino; M. R. Contarino; P. Molchanov; T. Curran; T. Keck; J. Keck; S. Allen; S. Shubert; R. Wienmann

    2011-01-01

    Military and other national security agencies have been denied unfettered access to the National Air Space (NAS) because their unmanned aircraft lack a reliable and effective collision avoidance capability. To overcome the constraints imposed on UASs use of the NAS, a new, conformable collision avoidance system has been developed - one that will be effective in all flyable weather conditions,

  6. Anlisis de textos sobre interacciones entre protenas1 Protein-Protein Interaction text analysis

    E-print Network

    Pla, Ferran

    entre proteínas (PPI) es una de las áreas de investigación más importantes en el campo de las celular, conocida la aparición de determinadas proteínas. La descripción de experimentos sobre PPI es el

  7. PERFORMANCE STUDIES DEGREE REQUIREMENTS Revised: 2005; December 2008

    E-print Network

    Ullrich, Paul

    Performance and Culture Among Native Americans NAS188 Native American Literature in Performance NAS224 American Dance and Culture in the United States, Brazil, Caribbean AHI251 Seminar in Tribal Arts AHI254 in Italian Renaissance Art AHI283 Seminar in Visual Culture and Gender AHI288 Seminar in European

  8. Adoption Practice in Canada: Emerging Trends and Challenges.

    ERIC Educational Resources Information Center

    Sobol, Michael P.; Daly, Kerry

    1995-01-01

    Reports the results of the National Adoption Study of Canada (NAS), which is based on demographic adoption statistics and a survey of adoption agencies and practitioners. The NAS found that between 1981 and 1990 the number of adoptions decreased by 47% and that private adoptions are accounting for an ever-increasing proportion of infant…

  9. Angiotensin-receptor blockers as therapy for mild- to-moderate hypertension-associated non-alcoholic steatohepatitis

    Microsoft Academic Search

    Eugen Florin Georgescu; Reanina Ionescu; Liliana Vancica; Mihaela Niculescu; Laurentiu Mogoanta

    AIM: To evaluate insulin resistance, cytolysis and non- alcoholic steatohepatitis (NASH) score (NAS) using the Kleiner and Brunt criteria in 54 patients with NASH and mild-to-moderate hypertension, treated with telmisar- tan vs valsartan for 20 mo. METHODS: All patients met the NCEP-ATP ? criteria for metabolic syndrome. Histology confirmed steato- hepatitis, defined as a NAS greater than five up to

  10. UM PROJETO ALTERNATIVO PARA INICIAÇÃO EM TECNOLOGIAS DIFITAIS NA FORMAÇÃO INICIAL DE PROFESSORES DE CIÊNCIAS E BIOLOGIA

    Microsoft Academic Search

    Simão Marinho

    Uma discussão sobre a formação de professores que sejam capazes de incorporar as tecnologias digitais na educação como recurso no processo de ensino -aprendizagem nas escolas da educação básica no Brasil passa necessariamente por um questionament o da prática atual das nossas licenciaturas em plena Era da Informação... De uma maneira geral, nas licenciaturas brasileiras ainda não se usam os

  11. The USAF Phillips Laboratory sodium-sulfur battery technology program: Results and status

    NASA Technical Reports Server (NTRS)

    Rainbow, Marc E.; Somerville, Andrew

    1996-01-01

    Tests performed on NaS batteries are reported. The results of safety and abuse testing, shock and vibration tests, cell failure on warm-up, freeze thaw, overtemperature conditions, electrolyte fracture, overdischarge, and short circuit tests are presented along with GEO and LEO cycle tests and the status of the NaS cell flight tests.

  12. RISK ANALYSIS OF HUMAN PERFORMANCE IN AVIATION MAINTENANCE

    Microsoft Academic Search

    James T. Luxhøj

    The National Airspace System (NAS) in the United States is a complex system involving many interrelated factors and actors. There are a plethora of diverse human, technical, environmental, and organizational factors that affect the performance of the NAS. While numerous methodologies exist for Probabilistic Risk Assessment in complex engineering systems, these specialized tools are somewhat limited in their use for

  13. DRAFT Not for Distribution American Institute of Aeronautics and Astronautics

    E-print Network

    , users of state-of-the-art NAS-wide simulators must encode decision-making in fixed sets of rules before-wide historic performance information. The results show the effectiveness of adaptive route selection, users of state-of-the-art NAS-wide simulators must encode decision-making in fixed sets of rules before

  14. "What Does Bowdoin Teach"? A Dialogue between Wood and Klingenstein

    ERIC Educational Resources Information Center

    Wood, Peter; Klingenstein, Tom

    2013-01-01

    This article is an exchange of ideas between Peter Wood, President of the National Association of Scholars (NAS), and Tom Klingerstein, Chairman of the Claremont Institute and NAS Board Director, on the study "What Does Bowdoin Teach? How a Contemporary Liberal Arts College Shapes Students" (by Peter Wood and Michael Toscano). This…

  15. A Tool for Integrating Commercial Space Operations Into The National Airspace System

    Microsoft Academic Search

    Daniel P. Murray

    Potential growth in the commercial space transportation industry, coupled with an expected doubling of air traffic operations over the next 10 years, could place additional safety and capacity demands on the National Airspace System (NAS). The Space and Air Traffic Management System (SATMS) is a proposed framework of operations designed to accommodate future commercial space operations within the NAS and

  16. Bold Plans for School Restructuring: The New American Schools Designs.

    ERIC Educational Resources Information Center

    Stringfield, Sam, Ed.; Ross, Steven, M., Ed.; Smith, Lana, Ed.

    In 1991, the New American Schools (NAS) Development Corporation was founded by a group of business and foundation leaders interested in investing in innovative designs for school transformation. This book describes the first 3 years of development and evaluation of 9 NAS whole-school restructuring designs. The designs were very diverse, as were…

  17. The Future of the National Association of Scholars

    ERIC Educational Resources Information Center

    Wood, Peter

    2012-01-01

    The National Association of Scholars (NAS) today is focused more than ever on public controversies and on public tools of communication. Where once NAS members were primarily concerned with debates within the academy, now they are equally concerned with debates about the academy. If the topics they address have changed, so too have the means by…

  18. Shifts in root-associated microbial communities of Typha latifolia growing in naphthenic acids and relationship to plant health.

    PubMed

    Phillips, Lori A; Armstrong, Sarah A; Headley, John V; Greer, Charles W; Germida, James J

    2010-01-01

    Naphthenic acids (NAs) are a complex mixture of organic acid compounds released during the extraction of crude oil from oil sands operations. The accumulation of toxic NAs in tailings pond water (TPW) is of significant environmental concern, and phytoremediation using constructed wetlands is one remediation option being assessed. Since root-associated microorganisms are an important factor during phytoremediation of organic compounds, this study investigated the impact of NAs on the microbial communities associated with the macrophyte Typha latifolia (cattail). Denaturing gradient gel electrophoresis revealed that the impact of NAs on microbial communities was niche dependent, with endophytic communities being the most stable and bulk water communities being the least stable. The type of NA used was significant to microbial response, with commercial NAs causing greater adverse changes than TPW NAs. In general, plant beneficial bacteria such as diazotrophs were favoured in cattails grown in TPW NAs, while potentially deleterious bacteria such as denitrifying Dechlorospirillum species increased in commercial NA treatments. These findings suggest that NAs may affect plant health by impacting root-associated microbial communities. A better understanding of these impacts may allow researchers to optimize those microbial communities that support plant health, and thus further optimize wetland treatment systems. PMID:21166345

  19. Relationship between Weather, Traffic and Delay Based on Empirical Methods

    NASA Technical Reports Server (NTRS)

    Sridhar, Banavar; Swei, Sean S. M.

    2006-01-01

    The steady rise in demand for air transportation over the years has put much emphasis on the need for sophisticated air traffic flow management (TFM) within the National Airspace System (NAS). The NAS refers to hardware, software and people, including runways, radars, networks, FAA, airlines, etc., involved in air traffic management (ATM) in the US. One of the metrics that has been used to assess the performance of NAS is the actual delays provided through FAA's Air Traffic Operations Network (OPSNET). The OPSNET delay data includes those reportable delays, i.e. delays of 15 minutes or more experienced by Instrument Flight Rule (IFR) flights, submitted by the FAA facilities. These OPSNET delays are caused by the application of TFM initiatives in response to, for instance, weather conditions, increased traffic volume, equipment outages, airline operations, and runway conditions. TFM initiatives such as, ground stops, ground delay programs, rerouting, airborne holding, and miles-in-trail restrictions, are actions which are needed to control the air traffic demand to mitigate the demand-capacity imbalance due to the reduction in capacity. Consequently, TFM initiatives result in NAS delays. Of all the causes, weather has been identified as the most important causal factor for NAS delays. Therefore, in order to accurately assess the NAS performance, it has become necessary to create a baseline for NAS performance and establish a model which characterizes the relation between weather and NAS delays.

  20. Coordination between carbon and nitrogen metabolism in nitrogen fixing bean nodules

    Technology Transfer Automated Retrieval System (TEKTRAN)

    A cDNA clone of asparagine synthetase (AS) called PvNAS2 and two different cDNA clones of PvNADH-GOGAT were isolated from bean nodules. Southern blot analysis indicated that a small gene family encodes AS. Northern analysis demonstrated that PvNAS2 expression is induced in nodules during the early d...

  1. A Situated View of Representation and Control Stanley J. Rosenschein \\Lambda

    E-print Network

    Kaelbling, Leslie Pack

    Administration under contract NAS2­13326 and by the Defense Advanced Research Projects Agency under NASA contract NAS2­ 13229 and under TEC contract DATA76­93­C­0017. y Work on this paper was supported in part

  2. Wavelet Sparse Approximate Inverse Preconditioners Tony F. Chan 1 \\Lambda and W. P. Tang 2 y and W. L. Wan 3 \\Lambda

    E-print Network

    Chan, Tony F.

    author also acknowledge support from RIACS/NASA Ames NAS 2­96027 and the Alfred P. Sloan Foundation by the Province of Ontario), and RIACS/NASA Ames NAS 2­96027. #12; 2 Tony F. Chan and W. P. Tang and W. L. Wan

  3. ARTICLE doi:10.1038/nature13793 Artificial sweeteners induce glucose

    E-print Network

    Gleeson, Joseph G.

    of NAS on glucose homeostasis, we added commercial formulations of saccharin, sucralose or aspartameARTICLE doi:10.1038/nature13793 Artificial sweeteners induce glucose intolerance by altering we demonstrate that consumption of commonly used NAS formulations drives the development of glucose

  4. Engine Design for LIFE Presentation to

    E-print Network

    -0111-20839s2.ppt 3 12 m ID Target injector Low-pressure gas vessel Beam port #12;The chamber system can be transported for maintenance or replacement Unsealed chamber, separate from the vacuum and optical systems connections are made with hydraulic couplers from industry Latkowski -- NAS/NAE, January 2011Latkowski -- NAS

  5. Cinco Ws e um H para o jornalismo na web

    Microsoft Academic Search

    João Canavilhas

    2008-01-01

    A influência da Internet nas mais diversas áreas de intervenção humana provocou alterações profundas nas rotinas profissionais e lúdicas dos cidadãos. No campo do jornalismo, a Internet influenciou fortemente a actividade profissional, permitindo ainda o aparecimento de um novo tipo de jornalismo comummente chamado ciberjornalismo, webjornalismo ou jornalismo digital. Embora as características deste novo tipo de jornalismo estejam perfeitamente identificadas

  6. N-Acetyl-Serotonin Offers Neuroprotection through Inhibiting Mitochondrial Death Pathways and Autophagic Activation in Experimental Models of Ischemic Injury

    PubMed Central

    Zhou, Hua; Wang, Jian; Jiang, Jiying; Stavrovskaya, Irina G.; Li, Mingchang; Li, Wei; Wu, Qiaofeng; Zhang, Xinmu; Luo, Chengliang; Zhou, Shuanhu; Sirianni, Ana C.; Sarkar, Sovan; Kristal, Bruce S.; Friedlander, Robert M.

    2014-01-01

    N-acetylserotonin (NAS) is an immediate precursor of melatonin, which we have reported is neuroprotective against ischemic injury. Here we test whether NAS is a potential neuroprotective agent in experimental models of ischemic injury. We demonstrate that NAS inhibits cell death induced by oxygen–glucose deprivation or H2O2 in primary cerebrocortical neurons and primary hippocampal neurons in vitro, and organotypic hippocampal slice cultures ex vivo and reduces hypoxia/ischemia injury in the middle cerebral artery occlusion mouse model of cerebral ischemia in vivo. We find that NAS is neuroprotective by inhibiting the mitochondrial cell death pathway and the autophagic cell death pathway. The neuroprotective effects of NAS may result from the influence of mitochondrial permeability transition pore opening, mitochondrial fragmentation, and inhibition of the subsequent release of apoptogenic factors cytochrome c, Smac, and apoptosis-inducing factor from mitochondria to cytoplasm, and activation of caspase-3, -9, as well as the suppression of the activation of autophagy under stress conditions by increasing LC3-II and Beclin-1 levels and decreasing p62 level. However, NAS, unlike melatonin, does not provide neuroprotection through the activation of melatonin receptor 1A. We demonstrate that NAS reaches the brain subsequent to intraperitoneal injection using liquid chromatography/mass spectrometry analysis. Given that it occurs naturally and has low toxicity, NAS, like melatonin, has potential as a novel therapy for ischemic injury. PMID:24553937

  7. Decisionmaking, Transitions, and Resilient Futures

    SciTech Connect

    Moss, Richard H.; Lane, Meredith A.

    2012-08-01

    The article describes the focus of research in the social sciences on environmental change, describing studies on adaptation and mitigation. It is the first of 5 articles in the NAS quarterly journal IS&T on the occasion of the launch of a new Board at the NAS chaired by the author.

  8. 78 FR 54635 - Notice of Intent To Prepare an Environmental Impact Statement for EA-18G Growler Airfield...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-05

    ...Growler airfield operations at Naval Air Station...Growler airfield operations, at NAS Whidbey...Coupeville High School Commons Area, 501...Anacortes Middle School Cafeteria, 2202...Whidbey Island is the home of all Navy tactical...existing VAQ airfield operations at NAS Whidbey...

  9. I. ASCRC General Education Form Group VIII: Ethics and Human Values X: Indigenous and Global Perspectives

    E-print Network

    Vonessen, Nikolaus

    Perspectives Dept/Program NAS Course # 303 Course Title Ecological Persepectives of Native Americans in NAS that focuses exclusively on Native American environmental views and, even though they are taken Indigenous and Global Perspectives in that the focus is on the many indigenous peoples of North America

  10. National Aeronautics and Space Administration

    E-print Network

    Lüttgen, Gerald

    National Aeronautics and Space Administration Langley Research Center Hampton, Virginia 23681 by the National Aeronautics and Space Administration under NASA Contract No. NAS1 97046 while the rst author by Universities Space Research Association March 2000 Prepared for Langley Research Center under Contract NAS1

  11. National Aeronautics and Space Administration

    E-print Network

    Guattery, Steve

    National Aeronautics and Space Administration Langley Research Center Hampton, Virginia 23681, Hampton, VA 23681­0001 (email: smg@icase.edu). This research was supported by the National Aeronautics and Space Administration under NASA Contract Nos. NAS1­97046 and NAS1­19480 while the author

  12. National Aeronautics and Space Administration

    E-print Network

    Lüttgen, Gerald

    National Aeronautics and Space Administration Langley Research Center Hampton, Virginia 23681- This research was supported by the National Aeronautics and Space Administration under NASA Contract No. NAS1 by Universities Space Research Association July 2000 Prepared for Langley Research Center under Contract NAS1

  13. National Aeronautics and Space Administration

    E-print Network

    Guattery, Steve

    National Aeronautics and Space Administration Langley Research Center Hampton, Virginia 23681, Hampton, VA 23681-0001 (email: smg@icase.edu). This research was supported by the National Aeronautics and Space Administration under NASA Contract Nos. NAS1-97046 and NAS1-19480 while the author

  14. Impacts of new agents for multiple myeloma on development of secondary myelodysplastic syndrome and acute myeloid leukemia.

    PubMed

    Hamano, Airi; Shingaki, Sumito; Abe, Yu; Miyazaki, Kanji; Sekine, Rieko; Nakagawa, Yasunori; Tsukada, Nobuhiro; Hattori, Yutaka; Suzuki, Kenshi

    2014-04-01

    The use of new agents (NAs) such as bortezomib, thalidomide, and lenalidomide has extended the survival of patients with multiple myeloma (MM). However, whether long-term treatment using NAs may increase the risk of second primary malignancies is a concern. Three hundred and thirty-three patients with MM were treated at our hospital from 1998 to 2013. Additional chromosomal abnormalities (CAs), associated with secondary myelodysplastic syndrome/acute myeloid leukemia, were observed in 13 of 152 users of NAs, but in 38 of 181 non-users of NAs. The cumulative CA incidence was higher in non-users of NAs. The CAs frequently observed were 13q-, 20q-, +8 in users of NAs, while -5/5q- and -7/7q- were detected in non-users of NAs. The total dose and treatment period of NAs did not differ between CAs-positive and -negative patients. However, a higher dose of melphalan was observed to have been used in patients who had CAs. Longer follow-up periods are necessary for an accurate risk assessment. PMID:24850453

  15. MODEL SIMULATION STUDIES OF SCALE-DEPENDENT GAIN IN STREAM NUTRIENT ASSIMILATIVE CAPACITY RESULTING FROM IMPROVING NUTRIENT RETENTION METRICS

    EPA Science Inventory

    Considering the difficulty in measuring restoration success for nonpoint source pollutants, nutrient assimilative capacity (NAS) offers an attractive systems-based metric. Here NAS was defined using an impulse-response model of nitrate fate and transport. Eleven parameters were e...

  16. AVS `95 LBL #36693 April 24, 1996 10 6.0 Acknowledgment

    E-print Network

    ://www.nas.nasa.gov/NAS/reports/nasreports.html [4] Lorensen, William E., and Cline, H. E., ``Marching Cubes: A High Resolution 3D Surface­Dimensional Unsteady Flows,'' Visualization 91, pp17­24, October 1991. [3] Meyer, Tom and Globus, Al, Direct

  17. Radon in Drinking Water

    MedlinePLUS

    ... pages, 1999.) The listed hardcover price for the book is $37.46 U.S. The NAS Executive Summary of the report and initial EPA perspectives are available online at http://water.epa.gov/lawsregs/rulesregs/sdwa/radon/nas.cfm Test Your Home for Radon — It's Easy and Inexpensive ...

  18. Infant autonomic functioning and neonatal abstinence syndrome

    PubMed Central

    Jansson, Lauren M.; DiPietro, Janet A.; Elko, Andrea; Velez, Martha

    2010-01-01

    Background Neonatal abstinence syndrome (NAS) expression is widely variable among affected infants and the reasons for this variability are largely unknown; mechanisms that predispose infants to NAS expression are not understood. It has been postulated that the regulatory problems of prenatally drug exposed infants are manifested in dysfunctional vagal regulation of autonomic processes. The current study examines whether cardiac vagal tone, an indicator of parasympathetic neuroregulation, provides a marker for autonomic dysregulation subsequently expressed as NAS in prenatally opioid-exposed newborns. Methods Heart period (HP) and cardiac vagal tone (V) were derived from electrocardiogram data collected from 64 methadone-exposed infants on postnatal days 1 and 3. The postpartum NAS course was assessed serially. Results Infants with lower V on day 1 had significantly higher NAS symptomatology on day 3. Boys had more severe NAS symptoms than girls through the first 4 days of life and, among infants receiving pharmacologic treatment for NAS, boys required longer treatment course and hospitalizations. Greater poly-drug exposure, detected through toxicology screening throughout pregnancy, and cocaine use in particular, were associated with lower V and shorter HP (faster heart rate) in newborns. Multiple regression models accounted for 25 to 35% of the variance in NAS symptoms and duration of hospitalization in methadone-exposed infants. Significant predictors included infant sex, SSRI/SNRI use, and cigarette smoking. Conclusions Results support the hypothesis of a biologic vulnerability of autonomic regulatory functioning in methadone-exposed infants and greater male infant vulnerability to maternal methadone use. PMID:20189732

  19. Sodium sulfur battery cell space flight experiment

    SciTech Connect

    Garner, J.C.; Baker, W.E.; Braun, W.; Kim, J. [Naval Research Lab., Washington, DC (United States). Naval Center for Space Technology

    1995-12-31

    A Sodium Sulfur (NaS) battery cell for space applications has been in development, with Air Force sponsorship, since the early 1980`s. At 100 Wh/kg, NaS batteries have twice the energy density of advanced nickel hydrogen (NiH{sub 2}) battery designs. Yet, the NaS battery cell is radically different from either nickel cadmium (NiCd) or NiH{sub 2} battery cells in two ways. First, NaS cells have a solid ceramic versus a liquid aqueous electrolyte. Second, NaS operates at 350 C versus 20 C for NiH{sub 2} and NiCd. How this unique battery cell operates in the zero-g environment of space is the purpose of the flight experiment described herein. The US Air Force Phillips Lab has tasked the US Naval Research Laboratory (NRL) to design, fabricate and integrate a NaS battery cell flight experiment. The experiment will fly with the Wake Shield Facility Cross Bay Carrier on a NASA Space Shuttle launch in November 1996. The experiment will heat-up, cool-down and operate four series connected NaS cells through three different charge/discharge profiles. After the experiment is complete, the NaS battery cells will be returned to the PL for destructive physical analysis. This paper will describe the NRL experiment implementation and design.

  20. Making the Case for New Research to Support the Integration of Small Unmanned Aircraft Systems into the National Airspace System

    NASA Technical Reports Server (NTRS)

    McAdaragh, Raymon M.; Comstock, James R., Jr.; Ghatas, Rania W.; Burdette, Daniel W.; Trujillo, Anna C.

    2014-01-01

    This paper describes the current state of sUAS regulation, their technical capabilities and the latest technologies that will allow for sUAS NAS integration. The research that is needed to demonstrate sUAS NAS integration capability is identified, and recommendations for conducting this necessary research are suggested.