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1

Periodo de Concentracin GEOMETRIA A GRAN ESCALA  

E-print Network

concentración Geometría a gran escala Aniceto Murillo, Universidad de Malaga. Cartel del curso Presentación concentración Geometría a gran escala Nigel Higson, Penn State University (EEUU). Cartel del curso Fotografias/Colloquium) Periodo de concentración Geometría a gran escala Jerzy Dydak, Universidad de Tennessee, EEUU Cartel del

Tradacete, Pedro

2

Columbia Project at NAS  

NASA Technical Reports Server (NTRS)

The Columbia Project at NAS is the construction and utilization of one of the world's most powerful compute resources. With 10,240 processors spread across 20512- processor nodes. this system provides NASA with an unparalleled capacity for capability processing. This demonstration will focus on describing the process of fielding this system while providing the NAS community with an ever-increasing capability during construction.

Thigpen, Bill

2004-01-01

3

Numerical Aerodynamic Simulation (NAS)  

NASA Technical Reports Server (NTRS)

The history of the Numerical Aerodynamic Simulation Program, which is designed to provide a leading-edge capability to computational aerodynamicists, is traced back to its origin in 1975. Factors motivating its development and examples of solutions to successively refined forms of the governing equations are presented. The NAS Processing System Network and each of its eight subsystems are described in terms of function and initial performance goals. A proposed usage allocation policy is discussed and some initial problems being readied for solution on the NAS system are identified.

Peterson, V. L.; Ballhaus, W. F., Jr.; Bailey, F. R.

1983-01-01

4

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., ...

5

UAS Integration in the NAS Project  

E-print Network

UAS Integration in the NAS Project Project Overview Presented by: Mr. Chuck Johnson Project Manager, UAS Integration in the NAS TAAC Albuquerque, NM December 7, 2010 1 #12;UAS Integration in the NAS (UAS) National Airspace System (NAS) access ­ Work with key stakeholders to define necessary

6

NASA's UAS NAS Access Project  

NASA Technical Reports Server (NTRS)

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.

Johnson, Charles W.

2011-01-01

7

Economas de escala en agua y saneamiento: examen de la literatura 1 Economas de escala en agua y saneamiento: examen de la literatura1  

E-print Network

Economías de escala en agua y saneamiento: examen de la literatura 1 Economías de escala en agua y relevar la literatura internacional sobre economías de escala en el sector de agua y saneamiento aprovechar economías de escala al dimensionar la prestación de agua potable y alcantarillado. La discusión

Boyer, Edmond

8

The NAS Computational Aerosciences Archive  

NASA Technical Reports Server (NTRS)

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

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

1995-01-01

9

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 of American Indians, Alaska Natives, and Native Hawaiians. e minor is meant to serve three primary

10

Greenhouse policy study from NAS  

NASA Astrophysics Data System (ADS)

The National Academy of Sciences will produce a study for the Environmental Protection Agency on policy responses to global warming. The report is due out before the end of 1990.Dan J. Evans, former U.S. Senator and former Governor of Washington, will chair a panel of the Commission on Science, Engineering, and Public Policy, a body of the councils of the NAS, National Academy of Engineering, and Institute of Medicine. Evans is a registered civil engineer and previously chaired the Pacific Northwest Electric Power and Conservation Planning Council.The 13-person panel includes AGU members Stephen Schneider of the National Center for Atmospheric Research and Robert Frosch, Vice President of Research Laboratores at General Motors Corp., Jessica Mathews, Vice President of the World Resources Institute, and Sir Crispin Tickell, the United Kingdom's Ambassador to the United Nations.

Maggs, William Ward

11

-NAS (Network Attached Storage) -Dateiserver mit eigenem (minimalem) Betriebssystem  

E-print Network

: File Transfer Protokoll Switch NASLAN Netzwerkschnittstelle: 100Mbit/s oder 1Gbit/s #12;NAS Vorteile/CIFS, FTP usw. NFS : Network File System SMB : Server Message Block CIFS : Common Internet File System FTP NAS I LAN NAS II (Backup) -zwei NAS mit je zwei Netzwerkinterfaces -ein dediziertes NAS für Backup

Ott, Albrecht

12

Status and projections of the NAS program  

NASA Technical Reports Server (NTRS)

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.

Bailey, Frank R.

1986-01-01

13

Communication Characteristics in the NAS Parallel Benchmarks  

E-print Network

) implementation of the NAS parallel benchmarks and study the effectiveness of com- piled communication for MPI, the effectiveness of compiled communication de- pends on whether the communication information can be ob- tained of MPI, it is important to study the communications in MPI programs and determine the effectiveness

Yuan, Xin

14

Implementation of NAS Parallel Benchmarks in Java.  

National Technical Information Service (NTIS)

A number of features make Java an attractive but a debatable choice for High Performance Computing (HPC). In order to gauge the applicability of Java to the Computational Fluid Dynamics (CFD) we have implemented NAS Parallel Benchmarks in Java. The perfor...

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

2000-01-01

15

Antimycobacterial Activity and Mechanism of Action of NAS-91?  

PubMed Central

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 ?9-desaturase activity allowed direct demonstration of the inhibition of oleic acid biosynthesis by these compounds. PMID:18086849

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

2008-01-01

16

Implementation of NAS Parallel Benchmarks in Java  

NASA Technical Reports Server (NTRS)

A number of features make Java an attractive but a debatable choice for High Performance Computing (HPC). In order to gauge the applicability of Java to the Computational Fluid Dynamics (CFD) we have implemented NAS Parallel Benchmarks in Java. The performance and scalability of the benchmarks point out the areas where improvement in Java compiler technology and in Java thread implementation would move Java closer to Fortran in the competition for CFD applications.

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

2000-01-01

17

Carrier spin relaxation in GaInNAsSb/GaNAsSb/GaAs quantum well  

SciTech Connect

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.

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

18

COMMUNICATION CHARACTERISTICS IN THE NAS PARALLEL Name: Ahmad A. Faraj  

E-print Network

COMMUNICATION CHARACTERISTICS IN THE NAS PARALLEL BENCHMARKS Name: Ahmad A. Faraj Department, 2002 In this research, we investigate the communication characteristics of the Message Passing Interface (MPI) implementation of the NAS parallel benchmarks and study the feasibility and effectiveness

Yuan, Xin

19

UAS Integration in the NAS Project - Project Overview  

NASA Technical Reports Server (NTRS)

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.

Johnson, Chuck

2011-01-01

20

HPC Symposium, NAS 2008R. L. Winslow Raimond L. Winslow  

E-print Network

HPC Symposium, NAS 2008R. L. Winslow Raimond L. Winslow The Institute for Computational Medicine and Integrative Modeling of Biological Systems #12;HPC Symposium, NAS 2008R. L. Winslow Molecule (Micro Physiology Domain ~ 10-3 Sec #12;HPC Symposium, NAS 2008R. L. Winslow Talk Outline Integrative Modeling

Winslow, Raimond

21

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

PubMed Central

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

2014-01-01

22

Remote access for NAS: Supercomputing in a university environment  

NASA Technical Reports Server (NTRS)

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.

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

1986-01-01

23

An Implementation Plan for NFS at NASA's NAS Facility  

NASA Technical Reports Server (NTRS)

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.

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

1998-01-01

24

NAS Grid Benchmarks: A Tool for Grid Space Exploration  

Microsoft Academic Search

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

Michael A. Frumkin; Rob F. Van Der Wijngaart

2001-01-01

25

The Need for Vendor Source Code at NAS. Revised  

NASA Technical Reports Server (NTRS)

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.

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

1997-01-01

26

Estudo de no gaussianidade nas anisotropias da RCF medidas Wmap  

NASA Astrophysics Data System (ADS)

A investigao do campo de flutuaes da Radiao Csmica de Fundo (RCF) pode oferecer um importante teste para os modelos cosmolgicos que descrevem a origem e a evoluo das flutuaes primordiais. De um lado, apresenta-se o modelo inflacionrio que prev um espectro de flutuaes adiabticas distribudas segundo uma gaussiana e, de outro, os modelos de defeitos topolgicos (dentre outros) que descrevem um mecanismo para a gerao de flutuaes de isocurvatura que obedecem a uma distribuio no gaussiana. Este trabalho tem como objetivo caracterizar traos do modelo no gaussiano de campo misto (entre flutuaes adiabticas e de isocurvatura) nos mapas do Wilkinson Microwave Anisotropy Probe (WMAP). Simulaes das anisotropias da RCF no contexto de mistura indicam traos marcantes na distribuio das flutuaes de temperatura, mesmo quando consideradas pequenas contribuies do campo de isocurvatura (da ordem de 0.001). O efeito da mistura entre os campos resulta na transferncia de potncia de flutuaes em escalas angulares intermedirias para flutuaes em pequenas escalas angulares. Este efeito pode ser caracterizado pela relao entre as amplitudes dos primeiros picos acsticos no espectro de potncia da RCF. Neste trabalho, investigamos a contribuio do campo de isocurvatura, no contexto de mistura, sobre as observaes recentes da RCF realizadas pelo WMAP. As previses do modelo de campo misto, uma vez confrontadas com as observaes em pequenas escalas angulares, podem ajudar a revelar a natureza das flutuaes primordiais.

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

2003-08-01

27

Implementation of the NAS Parallel Benchmarks in Java.  

National Technical Information Service (NTIS)

Several features make Java an attractive choice for High Performance Computing (HPC). In order to gauge the applicability of Java to Computational Fluid Dynamics (CFD), we have implemented the NAS (NASA Advanced Supercomputing) Parallel Benchmarks in Java...

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

2002-01-01

28

The NAS Parallel Benchmarks 2.1 Results  

NASA Technical Reports Server (NTRS)

We present performance results for version 2.1 of the NAS Parallel Benchmarks (NPB) on the following architectures: IBM SP2/66 MHz; SGI Power Challenge Array/90 MHz; Cray Research T3D; and Intel Paragon. The NAS Parallel Benchmarks are a widely-recognized suite of benchmarks originally designed to compare the performance of highly parallel computers with that of traditional supercomputers.

Saphir, William; Woo, Alex; Yarrow, Maurice

1996-01-01

29

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

USGS Publications Warehouse

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).

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

2005-01-01

30

Experimental studies on atmospheric Stirling engine NAS-2  

SciTech Connect

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.

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

31

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

Code of Federal Regulations, 2010 CFR

...contain a section entitled Network Analysis System (NAS). Payments...to meet schedules in Section Network Analysis System (NAS), or to process...the requirements of Section Network Analysis System (NAS) to the...

2010-10-01

32

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

PubMed

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 Satisfaccin 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

Gonzlez-Mart, Irene; Bustos, Juan Gregorio Fernndez; Jordn, Onofre Ricardo Contreras; Mayville, Stephen B

2012-09-01

33

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

NASA Technical Reports Server (NTRS)

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.

Bailey, F. R.

1985-01-01

34

Advanced Intermediate-Temperature Na-S Battery  

SciTech Connect

In this study, we reported an intermediate-temperature (~150C) sodium-sulfur (Na-S) battery. With a reduced operating temperature, this novel battery can potentially reduce the cost and safety issues associated with the conventional high-temperature (300~350C) Na-S battery. A dense ?"-Al2O3 solid membrane and tetraglyme were utilized as the electrolyte separator and catholyte solvent in this battery. Solubility tests indicated that cathode mixture of Na2S4 and S exhibited extremely high solubility in tetraglyme (e.g., > 4.1 M for Na2S4 + 4 S). CV scans of Na2S4 in tetraglyme revealed two pairs of redox couples with peaks at around 2.22 and 1.75 V, corresponding to the redox reactions of polysulfide species. The discharge/charge profiles of the Na-S battery showed a slope region and a plateau, indicating multiple steps and cell reactions. In-situ Raman measurements during battery operation suggested that polysulfide species were formed in the sequence of Na2S5 + S ? Na2S5 + Na2S4? Na2S4 + Na2S2 during discharge and in a reverse order during charge. This battery showed dramatic improvement in rate capacity and cycling stability over room-temperature Na-S batteries, which makes it attractive for renewable energy integration and other grid related applications.

Lu, Xiaochuan; Kirby, Brent W.; Xu, Wu; Li, Guosheng; Kim, Jin Yong; Lemmon, John P.; Sprenkle, Vincent L.; Yang, Zhenguo (Gary) [Gary

2013-01-01

35

Unstructured Adaptive (UA) NAS Parallel Benchmark. Version 1.0  

NASA Technical Reports Server (NTRS)

We present a complete specification of a new benchmark for measuring the performance of modern computer systems when solving scientific problems featuring irregular, dynamic memory accesses. It complements the existing NAS Parallel Benchmark suite. The benchmark involves the solution of a stylized heat transfer problem in a cubic domain, discretized on an adaptively refined, unstructured mesh.

Feng, Huiyu; VanderWijngaart, Rob; Biswas, Rupak; Mavriplis, Catherine

2004-01-01

36

NAS 301 Syllabus I. ASCRC General Education Form  

E-print Network

, and traditions; Enables a deeper understanding of Indigenous world views, religions, and ethics; Students, philosophy, ethics, and religion in Native American life, past and present, from the perspective of at leastNAS 301 Syllabus I. ASCRC General Education Form Group Group 10: Indigenous and Global and Ethics

Vonessen, Nikolaus

37

NAS Grid Benchmarks: A Tool for Grid Space Exploration  

NASA Technical Reports Server (NTRS)

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.

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

2001-01-01

38

Characterizations of GaInNAs/GaAs quantum wells  

NASA Astrophysics Data System (ADS)

Heterostructures of GaInNAs/GaAs multiple quantum wells were characterized by high resolution x-ray diffraction. Complexity and stress compensating effect of such quaternary alloys cause many characterization problems. One of the most important issue is determination of composition of the material, which cannot be performed utilizing only one characterization method. That is why structural analysis had to be related with optical measurements which give different information correlated with composition. A comparison of theoretical calculations of energy band gap with energy of transitions in GaInNAs QWs from photoluminescence or contactless electro-reflectance measurements supplement the results of HRXRD and gives complete information about the structure required as a feedback to develop technology of heterostructures epitaxial growth.

Bielak, Katarzyna; Pucicki, Damian; ?ciana, Beata; Radziewicz, Damian; Dawidowski, Wojciech; Badura, Mikolaj; Kudrawiec, Robert; Serafi?czuk, Jaros?aw; T?acza?a, Marek

2013-07-01

39

Implementation of the NAS Parallel Benchmarks in Java  

NASA Technical Reports Server (NTRS)

Several features make Java an attractive choice for High Performance Computing (HPC). In order to gauge the applicability of Java to Computational Fluid Dynamics (CFD), we have implemented the NAS (NASA Advanced Supercomputing) Parallel Benchmarks in Java. The performance and scalability of the benchmarks point out the areas where improvement in Java compiler technology and in Java thread implementation would position Java closer to Fortran in the competition for CFD applications.

Frumkin, Michael A.; Schultz, Matthew; Jin, Haoqiang; Yan, Jerry; Biegel, Bryan (Technical Monitor)

2002-01-01

40

Performance and Scalability of the NAS Parallel Benchmarks in Java  

NASA Technical Reports Server (NTRS)

Several features make Java an attractive choice for scientific applications. In order to gauge the applicability of Java to Computational Fluid Dynamics (CFD), we have implemented the NAS (NASA Advanced Supercomputing) Parallel Benchmarks in Java. The performance and scalability of the benchmarks point out the areas where improvement in Java compiler technology and in Java thread implementation would position Java closer to Fortran in the competition for scientific applications.

Frumkin, Michael A.; Schultz, Matthew; Jin, Haoqiang; Yan, Jerry; Biegel, Bryan A. (Technical Monitor)

2002-01-01

41

Hybrid Network Architectures for the Next Generation NAS  

NASA Technical Reports Server (NTRS)

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.

Madubata, Christian

2003-01-01

42

Factor Analysis of the Spanish Version of the WAIS: The Escala de Inteligencia Wechsler para Adultos (EIWA).  

ERIC Educational Resources Information Center

The standardization of the Escala de Inteligencia Wechsler para Adultos (EIWA) and the original Wechsler Adult Intelligence Scale (WAIS) were subjected to principal components analysis to examine their comparability for 616 EIWA subjects and 800 WAIS subjects. Similarity of factor structures of both scales is supported. (SLD)

Gomez, Francisco C., Jr.; And Others

1992-01-01

43

Comparison of WAIS and Escala de Inteligencia Wechsler para Adultos scores in an institutionalized Latin American psychiatric population  

Microsoft Academic Search

Vocabulary and Block Design subtests of the WAIS and its Puerto Rican counterpart, the Escala de Inteligencia Wechsler para Adultos (EIWA), were compared in a chronic population of 42 hospitalized Latins and Trans-Caribbean Blacks. A matched sample of 12 English and Spanish speakers was administered the WAIS and the EIWA subtests, respectively. A sample of bilingual Latins was administered the

Todd M. Davis; Vene L. Rodriguez

1979-01-01

44

Parallelization of NAS Benchmarks for Shared Memory Multiprocessors  

NASA Technical Reports Server (NTRS)

This paper presents our experiences of parallelizing the sequential implementation of NAS benchmarks using compiler directives on SGI Origin2000 distributed shared memory (DSM) system. Porting existing applications to new high performance parallel and distributed computing platforms is a challenging task. Ideally, a user develops a sequential version of the application, leaving the task of porting to new generations of high performance computing systems to parallelization tools and compilers. Due to the simplicity of programming shared-memory multiprocessors, compiler developers have provided various facilities to allow the users to exploit parallelism. Native compilers on SGI Origin2000 support multiprocessing directives to allow users to exploit loop-level parallelism in their programs. Additionally, supporting tools can accomplish this process automatically and present the results of parallelization to the users. We experimented with these compiler directives and supporting tools by parallelizing sequential implementation of NAS benchmarks. Results reported in this paper indicate that with minimal effort, the performance gain is comparable with the hand-parallelized, carefully optimized, message-passing implementations of the same benchmarks.

Waheed, Abdul; Yan, Jerry C.; Saini, Subhash (Technical Monitor)

1998-01-01

45

Concepts of Integration for UAS Operations in the NAS  

NASA Technical Reports Server (NTRS)

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.

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

2012-01-01

46

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

SciTech Connect

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.

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

47

Thermal management of GaInNAs/GaAs VECSELs  

NASA Astrophysics Data System (ADS)

Different methods used to reduce temperature increase within the active region of vertical-external-cavity surface-emitting lasers (VECSELs) are described and compared with the aid of the self-consistent thermal finite-element method. Simulations have been carried out for the GaInNAs/GaAs multiple-quantum-well (MQW) VECSEL operating at room temperature at 1.31 ?m. Main results are presented in form of `thermal maps' which can be simply used to determine maximal temperature of different structures at specified pumping conditions. It has been found that these maps are also appropriate for some other GaAs-based VECSELs and can be very helpful especially during structure designing. Moreover, convective and thermal radiation heat transfer from laser walls has been investigated.

Sok?, A. K.; Sarza?a, R. P.

2013-06-01

48

Validacin de la Escala de Conductas Indicadoras de Dolor para valorar el dolor en pacientes crticos, no comunicativos y sometidos a ventilacin mecnica: resultados del proyecto ESCID  

Microsoft Academic Search

ObjectiveTo determine the reliability and validity of the Scale of Behavior Indicators of Pain (Escala de Conductas Indicadoras de Dolor: ESCID) as a tool to assess pain in the critically ill, non-communicative patients with mechanical ventilation.

I. Latorre Marco; M. Sols Muoz; T. Falero Ruiz; A. Larrasquitu Snchez; A. B. Romay Prez; I. Milln Santos

2011-01-01

49

NAS Parallel Benchmark Results 11-96. 1.0  

NASA Technical Reports Server (NTRS)

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.

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

1997-01-01

50

Synthesis and biological evaluation of NAS-21 and NAS-91 analogues as potential inhibitors of the mycobacterial FAS-II dehydratase enzyme Rv0636  

PubMed Central

The identification of potential new anti-tubercular chemotherapeutics is paramount due to the recent emergence of extensively drug-resistant strains of Mycobacterium tuberculosis (XDR-TB). Libraries of NAS-21 and NAS-91 analogues were synthesized and evaluated for their whole-cell activity against Mycobacterium bovis BCG. NAS-21 analogues 1 and 2 demonstrated enhanced whole-cell activity in comparison to the parental compound, and an M. bovis BCG strain overexpressing the dehydratase enzyme Rv0636 was resistant to these analogues. NAS-91 analogues with ortho-modifications gave enhanced whole-cell activity. However, extension with biphenyl modifications compromised the whole-cell activities of both NAS-21 and NAS-91 analogues. Interestingly, both libraries demonstrated in vitro activity against fatty acid synthase II (FAS-II) but not FAS-I in cell-free extracts. In in vitro assays of FAS-II inhibition, NAS-21 analogues 4 and 5 had IC50 values of 28 and 19??g?ml?1, respectively, for the control M. bovis strain, and the M. bovis BCG strain overexpressing Rv0636 showed a marked increase in resistance. In contrast, NAS-91 analogues demonstrated moderate in vitro activity, although increased resistance was again observed in FAS-II activity assays with the Rv0636-overexpressing strain. Fatty acid methyl ester (FAME) and mycolic acid methyl ester (MAME) analysis of M. bovis BCG and the Rv0636-overexpressing strain revealed that the effect of the drug was relieved in the overexpressing strain, further implicating and potentially identifying Rv0636 as the target for these known FabZ dehydratase inhibitors. This study has identified candidates for further development as drug therapeutics against the mycobacterial FAS-II dehydratase enzyme. PMID:18599816

Bhowruth, Veemal; Brown, Alistair K.; Besra, Gurdyal S.

2008-01-01

51

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

PubMed Central

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

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

2010-01-01

52

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

USGS Publications Warehouse

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.

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

2004-01-01

53

Testing New Programming Paradigms with NAS Parallel Benchmarks  

NASA Technical Reports Server (NTRS)

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.

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

2000-01-01

54

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

E-print Network

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 ...

Weibel, Roland E.

2004-09-20

55

Performance assessment of multijunction solar cells incorporating GaInNAsSb  

PubMed Central

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

2014-01-01

56

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

NASA Astrophysics Data System (ADS)

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 107 ? 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.

Tan, K. H.; Yoon, S. F.; Wicaksono, S.; Loke, W. K.; Li, D. S.; Saadsaoud, N.; Tripon-Canseliet, C.; Lampin, J. F.; Decoster, D.; Chazelas, J.

2013-09-01

57

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

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 por Bonasa umbellus a Densidades Poblacionales bajas Abstract. Theory suggests habita

Gutiérrez, R.J.

58

Comparison of Scores on the WAIS and Its Puerto Rican Counterpart, Escala de Inteligencia Wechsler para Adultos, in an Institutionalized Latin American Psychiatric Population.  

ERIC Educational Resources Information Center

Compared vocabulary and block design subtests of the Wechsler Adult Intelligence Scale (WAIS) and its Puerto Rican counterpart, the Escala de Inteligencia Wechsler para Adultos (EIWA), in hospitalized Latins and Trans-Caribbean Blacks. EIWA scores were significantly higher than WAIS scores. Equivalence of EIWA and WAIS estimates is questioned.

Davis, Todd McLin; Rodriguez, Vene L.

1979-01-01

59

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

...Traffic Control Tower at Oceana NAS (Apollo Soucek Field) now operating on a part...geographic coordinates of Oceana NAS (Apollo Soucek Field) and NALF Fentress. DATES...Class D surface airspace at Oceana NAS (Apollo Soucek Field), VA, as the air...

2013-08-01

60

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

...Traffic Control Tower at Oceana NAS (Apollo Soucek Field) operating on a part time...upward from the surface at Oceana NAS (Apollo Soucek Field), VA. The Air Traffic...D and Class E airspace at Oceana NAS (Apollo Soucek Field), VA. This proposal...

2013-04-09

61

The nitrate-sensing NasST system regulates nitrous oxide reductase and periplasmic nitrate reductase in Bradyrhizobium japonicum.  

PubMed

The soybean endosymbiont Bradyrhizobium japonicum is able to scavenge the greenhouse gas N2 O through the N2 O reductase (Nos). In previous research, N2 O emission from soybean rhizosphere was mitigated by B.?japonicum?Nos(++) strains (mutants with increased Nos activity). Here, we report the mechanism underlying the Nos(++) phenotype. Comparative analysis of Nos(++) mutant genomes showed that mutation of bll4572 resulted in Nos(++) phenotype. bll4572 encodes NasS, the nitrate (NO3 (-) )-sensor of the two-component NasST regulatory system. Transcriptional analyses of nosZ (encoding Nos) and other genes from the denitrification process in nasS and nasST mutants showed that, in the absence of NO3 (-) , nasS mutation induces nosZ and nap (periplasmic nitrate reductase) via nasT. NO3 (-) addition dissociated the NasS-NasT complex in vitro, suggesting the release of the activator NasT. Disruption of nasT led to a marked decrease in nosZ and nap transcription in cells incubated in the presence of NO3 (-) . Thus, although NasST is known to regulate the NO3 (-) -mediated response of NO3 (-) assimilation genes in bacteria, our results show that NasST regulates the NO3 (-) -mediated response of nosZ and napE genes, from the dissimilatory denitrification pathway, in B.?japonicum. PMID:24947409

Snchez, Cristina; Itakura, Manabu; Okubo, Takashi; Matsumoto, Takashi; Yoshikawa, Hirofumi; Gotoh, Aina; Hidaka, Masafumi; Uchida, Takafumi; Minamisawa, Kiwamu

2014-10-01

62

All-GaInNAs ultrafast lasers: Material development for emitters and absorbers  

NASA Astrophysics Data System (ADS)

Defect engineering is a key feature in material development for active and passive laser devices. Active devices such as surface emitting lasers require excellent material quality with low defect concentration and good strain management. In contrast, passive devices such as saturable absorbers benefit from nonradiative recombination via defect states. Different molecular beam epitaxy (MBE) growth conditions and annealing parameters were developed to optimize GaInNAs for both active and passive devices. We have demonstrated for the first time an all-GaInNAs modelocked vertical external-cavity surface-emitting laser (VECSEL) at 1.3 ?m. We combined a GaInNAs VECSEL with a GaInNAs semiconductor saturable absorber mirror (SESAM) in a laser cavity. The VECSEL was optically pumped by an 808 nm semiconductor diode laser. The intracavity GaInNAs SESAM self-starts stable modelocking and generates a pulse duration of 18.7 ps with a pulse repetition rate of 6.1 GHz at 57 mW of average output power at a center wavelength of 1308 nm. In this paper, we briefly review the modelocking result and then focus on the MBE growth and fabrication of both active and passive GaInNAs devices.

Rutz, A.; Liverini, V.; Mller, E.; Schn, S.; Keller, U.

2007-04-01

63

Hydrazine N Source for Growth of GaInNAs for Solar Cells  

SciTech Connect

We evaluate hydrazine (Hy) as a nitrogen precursor source for the growth of GaNAs and GaInNAs for application in 1-eV solar cells lattice-matched to GaAs, and compare it to the more commonly used dimethylhydrazine (DMHy). The incorporation efficiency of N into the GaNAs alloy is found to be one to two orders of magnitude higher with Hy than with DMHy. This high N incorporation makes convenient the growth of GaNAs at higher growth temperatures, Tg=650 C, and arsine flows, AsH3/III=44, than are generally possible with the use of DMHy. GaInNAs and GaNAs solar cells are grown under these growth conditions and compared to a GaAs cell grown under the same conditions to determine the extent to which the poor minority-carrier properties routinely observed for the N-containing material can be attributed to the growth conditions. Finally, the background carrier concentrations for Hy- and DMHy-grown material are compared, and little difference is found between the two sources..

Friedman, D. J.; Geisz, G. F.; Kurtz, S. R.; Norman, A. G. (National Renewable Energy Laboratory); Yeh, Y. C. M. (TECSTAR, Inc.)

1999-05-25

64

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

NASA Technical Reports Server (NTRS)

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.

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

1994-01-01

65

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

NASA Technical Reports Server (NTRS)

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.

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

2014-01-01

66

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

SciTech Connect

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.

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

67

Status and projections of the NAS Program. [NASA Numerical Aerodynamic Simulation Program  

NASA Technical Reports Server (NTRS)

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 new 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. Presented here is the 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. Program status, near-term plans and plans for the next major milestone, the extended operating configuration, are also discussed.

Bailey, F. R.

1986-01-01

68

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

NASA Technical Reports Server (NTRS)

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.

Logan, Michael J.

2012-01-01

69

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

SciTech Connect

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 CAISOs 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 batterys physical characteristics are recommended, and modifications of the regulation signals sent to NaS batteries are proposed.

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

2011-03-23

70

Introduction of GaInNAs Gain Medium into Circularly Arranged Photonic Crystal Cavity  

NASA Astrophysics Data System (ADS)

We investigate the function of a circularly arranged submicron-scale optical cavity having a GaInNAs gain medium introduced into a two-dimensional photonic crystal slab. GaInNAs gain shows negligible optical degradations due to process damage, probably because of the small surface recombination velocity of the material. The preserved optical property realizes the observation of spectral peaks related to the cavity mode at wavelengths close to 1.3 m. Moreover, the cavity shows fine tunability of its characteristics via the deliberate adjustment of its structure.

Kukita, Kentaro; Nagatomo, Hiroshi; Goto, Hiroaki; Nakao, Ryo; Nakano, Katsunari; Mochizuki, Masaya; Kondow, Masahiko; Morifuji, Masato; Ishikawa, Fumitaro

2011-10-01

71

A 7-W 1178nm GaInNAs based disk laser for guide star applications  

NASA Astrophysics Data System (ADS)

We report a GaInNAs/GaAs-based disk laser producing 7 W output power at 1180 nm wavelength at a temperature of 15 C. The laser generated more than 5 W of output power when it was forced to operate with a narrow spectrum at 1178 nm. The gain mirror was grown using a molecular beam epitaxy reactor and it comprised 10 GaInNAs QWs and a 25.5- pair GaAs/AlAs distributed Bragg reflector.

Leinonen, T.; Korpijrvi, V.-M.; Puustinen, J.; Hrknen, A.; Guina, M.; Pessa, M.

2010-02-01

72

MBE grown GaInNAs-based multi-Watt disk lasers  

NASA Astrophysics Data System (ADS)

We report the fabrication and characterization of high-quality GaInNAs/GaAs gain mirror as an active media for semiconductor disk lasers emitting at the 12XX nm spectral range. The structure was fabricated by molecular beam epitaxy using a radio frequency plasma source for incorporating the nitrogen. The growth parameters have been optimized to reduce detrimental effects of nitrogen on the emission efficiency. Using the gain mirror, which comprised 10 GaInNAs quantum wells with a relatively low content of nitrogen, we demonstrated semiconductor disk laser with an output power of 5 W and a differential efficiency of 20%.

Korpijrvi, V.-M.; Guina, M.; Puustinen, J.; Tuomisto, P.; Rautiainen, J.; Hrknen, A.; Tukiainen, A.; Okhotnikov, O.; Pessa, M.

2009-03-01

73

GaInNAs: a novel material for long-wavelength semiconductor lasers  

Microsoft Academic Search

GaInNAs was proposed and created in 1995 by the authors. It can be grown pseudomorphically on a GaAs substrate and is a light-emitting material having a bandgap energy suitable for long-wavelength laser diodes (1.3-1.55 ?m and longer wavelengths). By combining GaInNAs with GaAs or other wide-gap materials that can be grown on a GaAs substrate, a type-I band lineup is

Masahiko Kondow; Takeshi Kitatani; S. Nakatsuka; M. C. Larson; K. Nakahara; Y. Yazawa; M. Okai; K. Uomi

1997-01-01

74

Nitrogen related vacancy formation in annealed GaInNAs quantum well superlattices  

NASA Astrophysics Data System (ADS)

We have used positrons annihilation spectroscopy to study vacancy type defects in GaAs based superlattices used for 1.3 ?m quantum well lasers. The samples were molecular beam epitaxy grown on p-type GaAs substrates. Three sets of samples were used for the experiment. For each set the superlattice structure consisted of 10 periods of the quantum well material separated by a GaAs buffer. As quantum well material we used GaInAs, GaNAs and GaInNAs. The growth temperature was 420C for each sample set and some of the samples were annealed. For annealed samples, it could be shown that vacancies were formed in the superlattice structure or at interface between the GaAs cap and the superlattice structure in the annealing process and that the formation was related to the nitrogen content. Annealed GaNAs and GaInNAs superlattice samples were found to contain vacancies, most likely in the Ga sublattice.

Slotte, J.; Saarinen, K.; Pavelescu, E.-M.; Hakkarainen, T.; Karirinne, S.; Jouhti, T.; Pessa, M.

2006-04-01

75

Curso 1 -Novos Avanos nas Tecnologias de Laser Scanner Aerotransportvel (New Advancements in Airborne Lidar Technology)  

E-print Network

Curso 1 - Novos Avanços nas Tecnologias de Laser Scanner Aerotransportável (New Advancements in Airborne Lidar Technology) Coordenadores: Edson Mitishita e Jorge Centeno (UFPR) Instrutores: Charles Toth important technology used to extract dense 3D geoinformation. The performance of lidar systems has increased

76

INFLUNCIA DAS CONDIES AMBIENTAIS NAS RELAES BSICAS N:P:K DAS FOLHAS DE RVORES URBANAS  

Microsoft Academic Search

3 RESUMO: Este trabalho investigou a influncia das condies ambientais das rvores nas relaes dos teores foliares de N, P e K. As espcies utilizadas foram: acer ( Acer negundo L.) e ip (Tabebuia chrysotricha ( Mart ex DC.) Standl). Foram selecionados locais com diferentes intensidades de trfego de veculos (trfego grande, mdio, residenciais e parques), condies ambientais ( com

D. Biondi; C. B. Reissmann

77

Comparison of Origin 2000 and Origin 3000 Using NAS Parallel Benchmarks  

NASA Technical Reports Server (NTRS)

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.

Turney, Raymond D.

2001-01-01

78

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

E-print Network

Introduction The symptoms of saturation that the Air Transportation System of the United States (NAS) shows [1 ] have motivated the proposal of investment to increase capacity. Previous research shows that adaption Equilibrium as defined by Game Theory: none of the agents voluntarily change their strategy without incentives

79

TRICARE; elimination of the non-availability statement (NAS) requirement for non-emergency inpatient mental health care. Final rule.  

PubMed

This final rule eliminates the requirement that states a NAS is needed for non-emergency inpatient mental health care in order for a TRICARE Standard beneficiary's claim to be paid. Currently, NAS are required for non-emergency inpatient mental health care for TRICARE Standard beneficiaries who live within a military treatment facility catchment area. At this time, the number of NASs issued is negligible as most mental health admissions are emergency admissions. Requiring a NAS for a relatively few non-emergency inpatient mental health admissions is disproportionate to the cost of maintaining the systems necessary to process and coordinate the NAS. PMID:23476989

2013-02-26

80

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

NASA Technical Reports Server (NTRS)

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.

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

2010-01-01

81

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

ERIC Educational Resources Information Center

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

Burgio, Louis D.; And Others

1990-01-01

82

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

SciTech Connect

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.

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

83

Photoreflectance Investigations of Temperature Dependence of the ``Different'' Energy Gaps in GaInNAs Compounds  

NASA Astrophysics Data System (ADS)

In this paper, we report photoreflectance investigations of GaInNAs layers almost lattice-matched to GaAs substrate and annealed at different temperatures. Our investigations done from 10 K to room temperature give evidence that these layers exhibit several distinct band gaps. These distinct band gaps, which were found to co-exist, are associated with different nitrogen bonding configurations (N-Ga4-mInm (0? m ?4) short-range-order clusters). The annealing-induced blueshift of GaInNAs band gap energy, which is usually observed in this system, is due to the change in the intensity of PR resonances related to different N-Ga4-mInm configurations.

Kudrawiec, R.; Misiewicz, J.; Pavelescu, E.-M.; Konttinen, J.; Pessa, M.

2005-06-01

84

Moth eye antireflection coated GaInP/GaAs/GaInNAs solar cell  

NASA Astrophysics Data System (ADS)

The performance of a GaInP/GaAs/GaInNAs solar cell incorporating AlInP moth eye antireflection coating is reported and compared with the performance of a similar cell comprising TiO2/SiO2 antireflection coating. The moth eye coating exhibits an average reflectance of only 2% within the spectral range from 400 nm to 1600 nm. EQE measurements revealed absorption-related losses in the AlInP moth eye coating at wavelengths below 510 nm. Short wavelength absorption decreases the current generation in the top GaInP junction by 10%. Despite the absorption losses, the moth eye patterned GaInP/GaAs/GaInNAs solar cell exhibited higher current generation under AM1.5G real sun illumination.

Aho, Arto; Tommila, Juha; Tukiainen, Antti; Polojrvi, Ville; Niemi, Tapio; Guina, Mircea

2014-09-01

85

Al-enhanced N incorporation in GaNAs alloys grown by chemical beam epitaxy  

NASA Astrophysics Data System (ADS)

The N incorporation is studied in AlGaNAs with low Al content grown by chemical beam epitaxy at low temperature using dimethylhydrazine as the N precursor. The incorporation efficiency is significantly enhanced by introducing a relatively low Al concentration. The relation between the N incorporation and N/(N+As) flow ratio for Al concentrations of 0-15% is presented. The highest N incorporation and the best AlGaNAs crystal quality are obtained between 400 C and 440 C, where the growth mode starts to change from 2D to 3D. The activation energies for N incorporation in both the 2D and 3D growth mode regions are extracted.

Kolhatkar, Gitanjali; Boucherif, Abderraouf; Valdivia, Christopher E.; Wallace, Steven G.; Fafard, Simon; Aimez, Vincent; Ars, Richard

2013-10-01

86

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

PubMed Central

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

2014-01-01

87

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

NASA Technical Reports Server (NTRS)

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.

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

1989-01-01

88

Performance Analysis of a Hybrid MPI\\/CUDA Implementation of the NAS-LU Benchmark  

Microsoft Academic Search

We present the performance analysis of a port of the LU benchmark from the NAS Parallel Benchmark (NPB) suite to NVIDIA's Compute Unified Device Architecture (CUDA), and report on the optimisation efforts employed to take advantage of this platform. Execution times are reported for several different GPUs, ranging from low-end consumergrade products to high-end HPC-grade devices, including the Tesla C2050

S. J. Pennycook; Simon D. Hammond; Stephen A. Jarvis; Gihan R. Mudalige

2011-01-01

89

Temperature Dependence of Photoluminescence Peak Energy in Ga(In)NAs  

SciTech Connect

Introducing normal coordinate system, theoretical approach to band gap alteration with temperature is described. The derived expression is applied to a GaNAs system having the nitrogen composition of about 1.4%. It is found that the band gap narrowing in this system is originated in the inter-band mixing assisted by an LO phonon at a {Gamma} point through electron--phonon interaction.

Emura, Shuichi; Asahi, Hajime [ISIR, Osaka University, 8-1 Mihoga-oka, Ibaraki, Osaka 567-0047 (Japan); Nakamoto, Hiroki; Ishikawa, Fumitaro; Kondow, Masahiko [Graduate School of Engineering, Osaka University, 2-1 Yakadaoka, Suita, Osaka 565-0871 (Japan)

2011-12-23

90

Jet fuel release investigation at an abandoned tank farm at NAS Adak, Alaska  

SciTech Connect

An investigation was performed to evaluate petroleum hydrocarbon impacts to soil and groundwater in a former tank farm area located at Naval Air Station (NAS) Adak, Adak Island, Alaska. This mountainous volcanic island lies approximately midway down the Aleutian Island chain, off the west coast of mainland Alaska. A portion of the island has been used as a military installation since 1942. NAS Adak currently occupies the northern half of Adak island; the southern half of the island is a national wildlife refuge. EMCON Northwest, Inc. (EMCON), was contracted to perform a Release Investigation in the Tank Farm A area of NAS Adak. The investigation focused on abandoned tanks, pipelines, known or suspected leaks, and releases. The study area included the former Tank Farm A fuel storage area and an area near the southern end of Runway 18-36. For discussion purposes, the Tank Farm A area has been divided into upland and lowland regions. It formerly contained more than 40 large above ground fuel storage tanks and associated piping. The lowland region includes the area generally south of the runway. The south runway area is crossed by several large fuel distribution pipelines of varying ages, some dating back to the 1940s.

Sagstad, S.R.; Boehlke, C.M.; Lovely, A.W. [EMCON Northwest, Inc., Bothell, WA (United States); Horwitz, S. [Navy, Silverdale, WA (United States)

1994-12-31

91

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

NASA Technical Reports Server (NTRS)

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.

1992-01-01

92

The CAS-NAS forum for new leaders in space science  

NASA Astrophysics Data System (ADS)

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 Foundations 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.

Smith, David H.

93

Improved container electrode coatings for Na/S battery systems. Final report  

SciTech Connect

Current sodium sulfur (Na/S) battery systems utilize the fast ion conducting properties of sodium beta{double_prime}-alumina electrolyte (BASE) to create high energy density sodium-sulfur electrochemical cells which can be used as components of secondary batteries. Since the days when these cells were invented at the Ford Motor Company Scientific Laboratory by J.T. Kummer and N. Weber, problems with container electrode corrosion have troubled the Na/S systems that have been developed in the many laboratories. In an unpublished investigation carried out at the Ford Motor Company laboratory, it was shown that titanium nitride films sputter deposited onto aluminum substrates under the appropriate conditions can exhibit excellent resistance to corrosion by sodium polysulfide melts. In the work carried out here, the corrosion resistant properties of TiN coatings sputter deposited on Al substrates have been investigated. TiN sputter coated aluminum samples were tested under static conditions in sodium sulfide melts and in Na/S cells under the range of electrochemical conditions needed for battery operation. The sputter deposited coatings produced in these experiments exhibited satisfactory corrosion resistance in the static tests but degraded under full cell operation. Tests of TiN coatings deposited by reactive ion-plating (IP), a common commercial process, showed excellent corrosion and electrical performance in both static and complete cell testing. Charge/discharge testing of sulfur core cells with IP coatings for over 350 cycles to 70 % depth of discharge has shown only very minor changes in cell performance and the tests are continuing.

Hunt, T.K. [Environmental Research Institute of Michigan, Ann Arbor, MI (United States). Applications Development Dept.

1995-08-01

94

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

NASA Technical Reports Server (NTRS)

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.

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

2012-01-01

95

Communication Improvement for the LU NAS Parallel Benchmark: A Model for Efficient Parallel Relaxation Schemes  

NASA Technical Reports Server (NTRS)

The first release of the MPI version of the LU NAS Parallel Benchmark (NPB2.0) performed poorly compared to its companion NPB2.0 codes. The later LU release (NPB2.1 & 2.2) runs up to two and a half times faster, thanks to a revised point access scheme and related communications scheme. The new scheme sends substantially fewer messages. is cache "friendly", and has a better load balance. We detail the, observations and modifications that resulted in this efficiency improvement, and show that the poor behavior of the original code resulted from deriving a message passing scheme from an algorithm originally devised for a vector architecture.

Yarrow, Maurice; VanderWijngaart, Rob; Kutler, Paul (Technical Monitor)

1997-01-01

96

High power frequency doubled GaInNAs semiconductor disk laser emitting at 615 nm.  

PubMed

We report on an optically-pumped intracavity frequency doubled GaInNAs/GaAs -based semiconductor disk laser emitting around 615 nm. The laser operates at fundamental wavelength of 1230 nm and incorporates a BBO crystal for light conversion to the red wavelength. Maximum output power of 172 mW at 615 nm was achieved from a single output. Combined power from two outputs was 320 mW. The wavelength of visible emission could be tuned by 4.5 nm using a thin glass etalon inside the cavity. PMID:19532562

Hrknen, Antti; Rautiainen, Jussi; Guina, Mircea; Konttinen, Janne; Tuomisto, Pietari; Orsila, Lasse; Pessa, Markus; Okhotnikov, Oleg G

2007-03-19

97

High power frequency doubled GaInNAs semiconductor disk laser emitting at 615 nm  

NASA Astrophysics Data System (ADS)

We report on an optically-pumped intracavity frequency doubled GaInNAs/GaAs -based semiconductor disk laser emitting around 615 nm. The laser operates at fundamental wavelength of 1230 nm and incorporates a BBO crystal for light conversion to the red wavelength. Maximum output power of 172 mW at 615 nm was achieved from a single output. Combined power from two outputs was 320 mW. The wavelength of visible emission could be tuned by 4.5 nm using a thin glass etalon inside the cavity.

Hrknen, Antti; Rautiainen, Jussi; Guina, Mircea; Konttinen, Janne; Tuomisto, Pietari; Orsila, Lasse; Pessa, Markus; Okhotnikov, Oleg G.

2007-03-01

98

A Framework for Safe Integration of Small UAS Into the NAS  

NASA Technical Reports Server (NTRS)

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.

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

2011-01-01

99

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

NASA Technical Reports Server (NTRS)

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.

1990-01-01

100

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

NASA Astrophysics Data System (ADS)

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 (EC), 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.

Islam, Muhammad Monirul; Miyashita, Naoya; Ahsan, Nazmul; Sakurai, Takeaki; Akimoto, Katsuhiro; Okada, Yoshitaka

2014-09-01

101

NAS Benchmarks on the Tera MTA Jay Boisseau \\Lambda , Larry Carter \\Lambda y , Kang Su Gatlin y , Amit Majumdar \\Lambda ,  

E-print Network

, Amit Majumdar \\Lambda , and Allan Snavely \\Lambday Abstract The Tera MTA is new, revolutionary commercial computer based on a multithreaded processor architec­ ture. We have compiled and run the five NAS

Snavely, Allan

102

1.5-microm monolithic GaInNAs semiconductor saturable-absorber mode locking of an erbium fiber laser.  

PubMed

We present a new monolithic GaAs-based semiconductor saturable absorber operating at 1.55 microm. An epitaxially grown absorber mirror in a GaInNAs/GaAs material system was successfully used to mode lock an erbium-doped fiber laser. The GaInNAs material system possesses intriguing physical properties and provides great potential for lasers and nonlinear optical devices operating at the 1.3-1.55-microm wavelength range. PMID:12659445

Okhotnikov, O G; Jouhti, T; Konttinen, J; Karirinne, S; Pessa, M

2003-03-01

103

5'-coding sequence of the nasA gene of Azotobacter vinelandii is required for efficient expression.  

PubMed

The operon nasACBH in Azotobacter vinelandii encodes nitrate and nitrite reductases that sequentially reduce nitrate to nitrite and to ammonium for nitrogen assimilation into organic molecules. Our previous analyses showed that nasACBH expression is subject to antitermination regulation that occurs upstream of the nasA gene in response to the availability of nitrate and nitrite. In this study, we continued expression analyses of the nasA gene and observed that the nasA 5'-coding sequence plays an important role in gene expression, as demonstrated by the fact that deletions caused over sixfold reduction in the expression of the lacZ reporter gene. Further analysis suggests that the nasA 5'-coding sequence promotes gene expression in a way that is not associated with weakened transcript folding around the translational initiation region or codon usage bias. The findings from this study imply that there exists potential to improve gene expression in A.vinelandii by optimizing 5'-coding sequences. PMID:25110215

Wang, Baomin; Wang, Yumei; Kennedy, Christina

2014-10-01

104

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

NASA Technical Reports Server (NTRS)

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.

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

1996-01-01

105

Growth and characterisation of Ga(NAsBi) alloy by metal-organic vapour phase epitaxy  

NASA Astrophysics Data System (ADS)

This paper summarises results of the epitaxial growth of Ga(NAsBi) by metal-organic vapour phase epitaxy (MOVPE) and the subsequent optical and structural characterisations of the samples. Ga(NAsBi)/GaAs multi-quantum well (MQW) samples are grown at 400 C and single layers at 450 C on GaAs (001) substrates. Triethylgallium (TEGa), tertiarybutylarsine (TBAs), trimethylbismuth (TMBi) and unsymmetrical dimethylhydrazine (UDMHy) are used as precursors. Secondary ion mass spectrometry (SIMS) shows that the Bi content is independent of the N content in the alloy. It is found that the N content depends on both UDMHy and TMBi supply during growth. High resolution X-ray diffraction (HR-XRD), scanning transmission electron microscopy (STEM) and atomic force microscopy (AFM) measurements show that samples with good crystalline quality can be realised. For samples containing 1.8% Bi and up to 1.8% N grown at 450 C, photoreflectance spectroscopy (PR) shows a decrease in the band gap with increasing N content of 14122 meV/% N.

Bushell, Z. L.; Ludewig, P.; Knaub, N.; Batool, Z.; Hild, K.; Stolz, W.; Sweeney, S. J.; Volz, K.

2014-06-01

106

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

NASA Technical Reports Server (NTRS)

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.

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

1995-01-01

107

NasT-mediated antitermination plays an essential role in the regulation of the assimilatory nitrate reductase operon in Azotobacter vinelandii.  

PubMed

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, P(nasA), is under NtrC control. However, unlike NtrC-regulated promoters in enteric bacteria, P(nasA) shows high activity in the presence of ammonium; in addition, the P(nasA) 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

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

2012-09-01

108

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

NASA Technical Reports Server (NTRS)

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.

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

2006-01-01

109

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

NASA Technical Reports Server (NTRS)

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.

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

2006-01-01

110

Characterization of a Dominant Electron Trap in GaNAs Using Deep-Level Spectroscopy  

SciTech Connect

Dilute-nitrogen GaNAs epitaxial layers grown by metal-organic chemical vapor deposition were characterized by deep-level transient spectroscopy (DLTS). For all samples, the dominant DLTS signal corresponds to an electron trap having an activation energy of about 0.25 to 0.35 eV. The minority-carrier trap density in the p-type material is quantified based on computer simulation of the devices. The simulations show that only about 2% of the traps in the depleted layer are filled during the transient. The fraction of the traps that are filled depends strongly on the depth of the trap, but only weakly on the doping of the layers and on the conduction-band offset. The simulations provide a pathway to obtain semi-quantitative data for analysis of minority-carrier traps by DLTS.

Johnston, S. W.; Kurtz, S. R.

2006-08-01

111

1.22 ?m GaInNAs Saturable Absorber Mirrors with Tailored Recovery Time  

NASA Astrophysics Data System (ADS)

The effect of in-situ N-ion irradiation on the recombination dynamics of GaInNAs/GaAs semiconductor saturable absorber mirrors has been studied. The samples were fabricated by molecular beam epitaxy using a radio frequency plasma source for nitrogen incorporation in the absorber layers as well as for the irradiation. The recombination dynamics of irradiated samples were studied by pump-probe measurements. The recombination time of the absorbers could be reduced by increasing the irradiation time. The effect of the reduced recombination time on the pulse dynamics of a mode-locked laser setup was studied with a Bi-doped fibre laser. The pulse quality was found to improve with increased irradiation time and reduced recombination time, demonstrating the potential of the in-situ irradiation method for device applications.

Puustinen, Janne; Guina, Mircea; Korpijrvi, Ville-Markus; Marcinkevicius, Saulius; Tukiainen, Antti; Kivist, Samuli; Pessa, Markus

2010-11-01

112

Development of computer program NAS3D using Vector processing for geometric nonlinear analysis of structures  

NASA Technical Reports Server (NTRS)

An algorithm for vectorized computation of stiffness matrices of an 8 noded isoparametric hexahedron element for geometric nonlinear analysis was developed. This was used in conjunction with the earlier 2-D program GAMNAS to develop the new program NAS3D for geometric nonlinear analysis. A conventional, modified Newton-Raphson process is used for the nonlinear analysis. New schemes for the computation of stiffness and strain energy release rates is presented. The organization the program is explained and some results on four sample problems are given. The study of CPU times showed that savings by a factor of 11 to 13 were achieved when vectorized computation was used for the stiffness instead of the conventional scalar one. Finally, the scheme of inputting data is explained.

Mangalgiri, P. D.; Prabhakaran, R.

1986-01-01

113

Security Risk Assessment Process for UAS in the NAS CNPC Architecture  

NASA Technical Reports Server (NTRS)

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.

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

2013-01-01

114

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

NASA Technical Reports Server (NTRS)

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.

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

2001-01-01

115

Mid-infrared luminescence of an InNAsSb/InAs single quantum well grown by molecular beam epitaxy  

SciTech Connect

The authors report the growth and characterization of a dilute nitride, InNAsSb/InAs, by solid source molecular beam epitaxy. Optimizing growth conditions for nitrogen incorporation has resulted in high-quality InNAsSb epilayers without any structural degradation, as confirmed by high-resolution x-ray diffraction. Optical properties were investigated by temperature dependent and excitation power dependent photoluminescence. The authors obtained mid-infrared luminescence around 4 {mu}m at low temperature, which reveals strong carrier localization behavior at low temperature, induced by nitrogen and antimony interaction. The band alignment of InNAsSb/InAs can be type I instead of the conventional type II found for InAsSb/InAs. A conduction band offset, E{sub c}, of {approx}102 meV was obtained.

Yuen, Homan B.; Kim, Seongsin M.; Hatami, Fariba; Harris, James S.; Chin, Alan H. [Solid State and Photonics Laboratory, Department of Electrical Engineering, Stanford University, Stanford, California 94305-4075 (United States); Center for Nanotechnology, NASA Ames Research Center, Moffett Field, California 94035 (United States)

2006-09-18

116

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

PubMed Central

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

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

2012-01-01

117

Ion irradiation induced nitrogen mobility in a GaInNAs quantum well laser  

NASA Astrophysics Data System (ADS)

Changes in the optical properties in GaInNAs/GaAs quantum wells after alpha particle bombardment followed by low temperature annealing are reported. Both blue and red shifts of the lasing wavelength are observed under different annealing conditions. This differs from the usually observed blue shift which is found after high-temperature post-grown annealing. Competing processes that result in the lasing wavelength shifts are energetic considerations which act to increase the number of Ga-N and In-As bonds (maximize the cohesive energy), minimizing the strain of the system which increases the number of In-N and Ga-As bonds (large-ion-small-ion links), maximizing the number of N located at lattice sites effective at shrinking the band-gap and moving the N position within the quantum well. For the case of high-temperature post-grown annealing the increase of Ga-As and In-N bonding wins, resulting in the blue shift observed. The wavelength shifts are discussed in terms of these competing mechanisms.

Qiu, Y. N.; Papaioannou, G.; Pozo, J.; Rorison, J. M.; Saarinen, M.; Konttinen, J.; Viheril, J.; Leinonen, P.; Jouhti, T.; Pessa, M.

2008-07-01

118

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

NASA Technical Reports Server (NTRS)

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 this 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.

Jin, H.; Frumkin, M.; Hribar, M.; Waheed, A.; Yan, J.; Saini, Subhash (Technical Monitor)

1999-01-01

119

1-eV GaInNAs solar cells for ultrahigh-frequency multijunction devices  

SciTech Connect

The authors demonstrate working prototypes of a GaInNAs-based solar cell lattice-matched to GaAs with photoresponse down to 1 eV. This device is intended for use as the third junction of future-generation ultrahigh-efficiency three- and four-junction devices. Under the AM1.5 direct spectrum with all the light higher in energy than the GaAs band gap filtered out, the prototypes have open-circuit voltages ranging from 0.35 to 0.44 V, short-circuit currents of 1.8 mA/cm{sup 2}, and fill factors from 61--66%. The short-circuit currents are of principal concern: the internal quantum efficiencies rise only to about 0.2. The authors discuss the short diffusion lengths which are the reason for this low photocurrent. As a partial workaround for the poor diffusion lengths, they demonstrate a depletion-width-enhanced variation of one of the prototype devices that grades off decreased voltage for increased photocurrent, with a short-circuit current of 6.5 mA/cm{sup 2} and an open-circuit voltage of 0.29 V.

Friedman, D.J.; Geisz, J.F.; Kurtz, S.R.; Olson, J.M. [National Renewable Energy Lab., Golden, CO (United States)

1998-09-01

120

One-dimensional carbon-sulfur composite fibers for Na-S rechargeable batteries operating at room temperature.  

PubMed

Na-S batteries are one type of molten salt battery and have been used to support stationary energy storage systems for several decades. Despite their successful applications based on long cycle lives and low cost of raw materials, Na-S cells require high temperatures above 300 C for their operations, limiting their propagation into a wide range of applications. Herein, we demonstrate that Na-S cells with solid state active materials can perform well even at room temperature when sulfur-containing carbon composites generated from a simple thermal reaction were used as sulfur positive electrodes. Furthermore, this structure turned out to be robust during repeated (de)sodiation for ~500 cycles and enabled extraordinarily high rate performance when one-dimensional morphology is adopted using scalable electrospinning processes. The current study suggests that solid-state Na-S cells with appropriate atomic configurations of sulfur active materials could cover diverse battery applications where cost of raw materials is critical. PMID:23981085

Hwang, Tae Hoon; Jung, Dae Soo; Kim, Joo-Seong; Kim, Byung Gon; Choi, Jang Wook

2013-09-11

121

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...

122

GEOPROCESSAMENTO APLICADO A ECOLOGIA DE PAISAGEM: UMA ANLISE DA DINMICA ESPACIAL DA ILHA DO PAPAGAIO PA, AMAZNIA-BRASIL  

Microsoft Academic Search

O geoprocessamento uma importante ferramenta para se compreender a estrutura e a dinmica das paisagens em diversas escalas temporais e espaciais, quando aplicado ecologia de paisagem traz elementos tanto para o estudo das interaes do homem com o meio ambiente, quanto para compreender os processos ecolgicos. Dessa forma objetiva-se com este artigo, levantar as situaes ambientais associadas

Joyse Tatiane Souza dos Santos; Heriberto Wagner Amanajs Pena

2011-01-01

123

Fabrication and characterization of GaInNAs/GaAs semiconductor optical amplifiers  

NASA Astrophysics Data System (ADS)

The constraints on dilute-nitride Semiconductor Optical Amplifiers (SOAs) for multi-wavelength amplification have been evaluated. SOAs have been fabricated by angling the facets of a GaInNAs/GaAs edge emitting laser using gas enhanced focused ion beam etching. The original laser has been characterized in terms of its temperature dependence and net modal gain. A full width half maximum (FWHM) of 40nm has been found at 298K. Good temperature stability has also been found with a value of 0.35nm/K for the lasing wavelength. The good temperature stability of the device has been explained in terms of the role that the monomolecular recombination plays in the temperature dependence of the device. The monomolecular recombination has been reported temperature independent having two key effects; reduction of the temperature performance and reduction of the dynamic performance in terms of an increase in the threshold current and a decrease of the high speed potential. Iodine gas enhanced focused ion beam etching (GAE-FIB) has been used for the fabrication of the SOA, the iodine gas increasing the etching rate by a factor of 2.5. The fabrication has been completed in two steps; in the first one the facets have been angled and in the second step a cross-section procedure has been employed for smoothing of the facets. Once the SOA has been fabricated its potential for simultaneous multiple channel amplification has been studied. A flat gain spectrum over a range of 40nm has been obtained. This value and the wavelength range have good agreement with the net modal gain measured in the original laser device. In addition, minimum channel interspacing has been achieved with no wavelength degradation.

Pozo, J.; Vogiatzis, N.; Ansell, O.; Heard, P. J.; Rorison, J. M.; Tuomisto, P.; Konttinen, J.; Saarinen, M.; Peng, C.; Viheril, J.; Leinonen, T.; Pessa, M.

2008-04-01

124

Investigation on the high speed modulation in (GaIn)(NAs)/GaAs lasers  

NASA Astrophysics Data System (ADS)

The potential of 1.3um GaInNAs SQW laser diodes for high speed operation is experimentally investigated in this paper, computing the differential gain, dg/dn, at a temperature range suitable for most network applications (293K-348K) and the small signal modulation bandwidth. The investigation begins with a basic characterization calculating the T0, with a value of 56K in a range of temperatures of 293K-318K. The lasing wavelength at 293K is found to be 1250nm with a linear temperature dependence of 0.377nm/K. Secondly, the paper presents a detailed study of the modulation bandwidth of the device, obtaining a value of 6.06Ghz for the maximum modulation bandwidth at 293K. In a range of temperatures of 293K-318K, the modulation bandwidth is found to decrease only slightly with the temperature with a slope of 0.0088Ghz/K. Finally, the paper explains the temperature behaviour obtained for the modulation bandwidth studying the temperature dependence of the differential gain, dg/dn. For this evaluation, the value of the differential gain with the current (how the peak gain changes with the sub-threshold bias current applied to the sample), dg/dI, is obtained using the Hakki-Paoli method. Using impedance measurements, a relation between the carrier density, n, and the bias current applied to the laser, I, has been obtained. With this relation, we obtained the differential current with the carrier density, dI/dn. Then, we calculated the differential gain dg/dn = dg/dI * dI/dn. To conclude we saw how the differential gain, dg/dn, has been found to have similar temperature behaviour as the small signal modulation bandwidth.

Pozo, J.; Qiu, Y.; Ivanov, P.; Yu, P.; Rorison, J. M.; Saarinen, M. J.; Konttinen, J.; Jouhti, T.; Pessa, M.

2005-07-01

125

Abundncias de oxignio e enxofre nas estrelas de tipo solar da vizinhana solar  

NASA Astrophysics Data System (ADS)

Alguns resultados sugerem que o Sol seja 58% mais abundante em oxignio que o meio interestelar local. Esta anomalia parece estender-se para o carbono e o criptnio. Entre as possveis explicaes deste fenmeno esto: uma supernova de tipo II que tenha enriquecido a nebulosa protosolar, tornando-a superabundante em oxignio; um episdio de infall de material pobre em metais sobre o disco Galtico, diluindo o meio interestelar local ou uma migrao dinmica do Sol de uma rbita mais interna da Galxia para sua posio atual. A escolha entre estes cenrios exige o conhecimento preciso da abundncia solar em relao s ans G da vizinhana. Neste contexto, o oxignio e enxofre, so elementos-chave por serem ambos produzidos pelas supernovas de tipo II, devendo portanto possuir o mesmo padro de abundncia. Este projeto visa esclarecer qual a posio do Sol na distribuio local de abundncias de enxofre e oxignio para uma amostra de estrelas de tipo solar com idades e metalicidades bem conhecidas. Para tal, analisamos espectros de alta resoluo e alta relao sinal-rudo nas regies espectrais de ll 6300, 7774 (O) e l8695 (S). Para o enxofre encontramos que o Sol parece ser uma estrela tpica dentre as da vizinhana, e que este elemento no mostra a sobreabundncia para baixas metalicidades, j bem estabelecida para o oxignio. Discutimos as abundncias do enxofre no contexto da Evoluo Qumica da Galxia. Apresentamos resultados preliminares muito precisos para a linha proibida do oxignio l6300 e comparamos estes com os obtidos para o tripleto em l7774. Quantificamos os efeitos no-ETL presentes no tripleto em funo dos parmetros atmosfricos estelares.

Requeijo, F.; Porto de Mello, G. F.

2003-08-01

126

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

PubMed

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

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

2012-01-01

127

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

PubMed Central

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

2012-01-01

128

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

SciTech Connect

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.

Jantzen, C.; Pierce, E.

2010-11-01

129

Photoreflectance evidence of multiple band gaps in dilute GaInNAs layers lattice-matched to GaAs  

NASA Astrophysics Data System (ADS)

Dilute Ga1-xInxNyAs1-y/GaAs quantum wells with high In-content, which are under compressive strain, have been shown previously to exhibit multiple band gaps, likely due to the presence of different nitrogen nearest-neighbor environments, i.e., N-Ga4-mInm(0?m ?4) short-range-order clusters. Here, photoreflectance (PR) measurements on lattice-matched dilute GaInNAs-on-GaAs layers with low indium and nitrogen content are reported, which give evidence that these layers also exhibit several distinct band gaps. These distinct band gaps, which were found to coexist, are associated with different nitrogen bonding configurations, as revealed by Raman spectroscopy. Thus, the metastable nature of GaInNAs seems to be a persistent intrinsic property, irrespective of strain and indium content. The annealing-induced blueshift of GaInNAs band gap energy, which is usually observed in this system, has been associated with the change in the intensity of PR resonances related to different N-Ga4-mInm configurations.

Kudrawiec, R.; Pavelescu, E.-M.; Wagner, J.; Sek, G.; Misiewicz, J.; Dumitrescu, M.; Konttinen, J.; Gheorghiu, A.; Pessa, M.

2004-09-01

130

Improvements in GaInNAs/GaAs quantum-well lasers using focused ion beam post-processing  

NASA Astrophysics Data System (ADS)

At the present time, there is a considerable demand for long wavelength (1.3?m-1.5?m) laser diodes for low cost data-communication applications capable of operating at high speed and at high ambient temperatures without the need for thermoelectric coolers. First proposed in 1995 by M. Kondow, the GaInNAs/GaAs material system has attracted a great deal of interest as it promises good temperature performance. The broad gain observed in GaInNAs/GaAs QW samples suggests that wavelength tuning should be possible by the application of gratings to select an optical mode. In addition, splitting the contact has been shown to improve modulation speed in other materials. These two methods should be able to be used jointly and processed together. The use of split-contact lasers has the advantage of that no change is made in the processing steps, since there is only need for a new metal mask to define a new top p-contact. Despite the bandwidth enhancement of two-contact lasers compared to the single contact case is well known, to the authors' knowledge, so far it has not being applied to GaInNAs/GaAs lasers. The use of Bragg-gratings on the ridge waveguide of the laser will generate a periodic modulation inducing an interaction between the forward and backward travelling modes. The effect of this interaction is the one of a band pass filter on the gain shape of the laser, allowing filtering out the actual lasing wavelength, and tuning the lasing wavelength in the range of wavelengths with substantial optical gain. Therefore, this method can be used optimally in lasers with broad gain, as is the case of GaInNAs/GaAs. In this paper, we reveal experimental investigations in how to apply these two post-processing methods to 600m-long 1.25?m-Ga 0.66In 0.34N 0.01As0. 0.99/GaAs 6nm single quantum-well ridge waveguide lasers.

Pozo, J.; Hu, J.; Rorison, J. M.; Saarinen, M.; Konttinen, J.; Viheril, J.; Leinonen, P.; Jouhti, T.; Pessa, M.

2006-04-01

131

Room temperature electron spin relaxation in GaInNAs multiple quantum wells at 1.3 ?m  

NASA Astrophysics Data System (ADS)

The authors report a direct measurement of electron spin relaxation in GaInNAs semiconductor multiple quantum wells at room temperature. Multiple quantum wells of widths 5.8, 7, and 8nm exhibiting excitonic absorption around 1.3?m have been studied. Spin relaxation times were found to increase with well width in the range of 77-133ps. The spin relaxation time dependence on first electron confinement energy suggests the Elliot-Yafet mechanism [A. Tackeuchi et al., Physica B 272, 318 (1999)] as the dominant relaxation process.

Reith, C.; White, S. J.; Mazilu, M.; Miller, A.; Konttinen, J.; Guina, M.; Pessa, M.

2006-11-01

132

Electron-irradiation enhanced photoluminescence from GaInNAs /GaAs quantum wells subject to thermal annealing  

NASA Astrophysics Data System (ADS)

Electron irradiation of a 1.3-?m-GaInNAs/GaAs multi-quantum-well heterostructure, grown by molecular beam epitaxy and subsequently rapid-thermal annealed, is found to induce much stronger photoluminescence than what is observed for an identical as-grown sample upon annealing. Annealing of the irradiated sample also causes a small additional spectral blueshift and reduces alloy potential energy fluctuations at the conduction band minimum. These irradiation-related phenomena are accompanied by small but discernable changes in x-ray diffraction features upon annealing, which indicate compositional and/or structural changes in the quantum wells.

Pavelescu, E.-M.; Gheorghiu, A.; Dumitrescu, M.; Tukiainen, A.; Jouhti, T.; Hakkarainen, T.; Kudrawiec, R.; Andrzejewski, J.; Misiewicz, J.; Tkachenko, N.; Dhaka, V. D. S.; Lemmetyinen, H.; Pessa, M.

2004-12-01

133

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

NASA Technical Reports Server (NTRS)

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.

Gillian, Ronnie E.; Lotts, Christine G.

1988-01-01

134

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)

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.

2007-01-01

135

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

PubMed Central

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?=?6meV) for the QW annealed at 700C. In addition, the value of PL decay time at the peak energy was compared for all samples. The longest PL decay time (600ps) was observed for the sample annealed at 700C. It means that based on the PL dynamics, the optimal annealing temperature for this QW is approximately 700C. PMID:24533740

2014-01-01

136

High gain 1.3-?m GaInNAs SOA with fast gain dynamics and enhanced temperature stability  

NASA Astrophysics Data System (ADS)

Semiconductor optical amplifiers (SOAs) are a well-established solution of optical access networks. They could prove an enabling technology for DataCom by offering extended range of active optical functionalities. However, in such costand energy-critical applications, high-integration densities increase the operational temperatures and require powerhungry external cooling. Taking a step further towards improving the cost and energy effectiveness of active optical components, we report on the development of a GaInNAs/GaAs (dilute nitride) SOA operating at 1.3?m that exhibits a gain value of 28 dB and combined with excellent temperature stability owing to the large conduction band offset between GaInNAs quantum well and GaAs barrier. Moreover, the characterization results reveal almost no gain variation around the 1320 nm region for a temperature range from 20 to 50 C. The gain recovery time attained values as short as 100 ps, allowing implementation of various signal processing functionalities at 10 Gb/s. The combined parameters are very attractive for application in photonic integrated circuits requiring uncooled operation and thus minimizing power consumption. Moreover, as a result of the insensitivity to heating issues, a higher number of active elements can be integrated on chip-scale circuitry, allowing for higher integration densities and more complex optical on-chip functions. Such component could prove essential for next generation DataCom networks.

Fitsios, D.; Giannoulis, G.; Iliadis, N.; Korpijrvi, V.-M.; Viheril, J.; Laakso, A.; Dris, S.; Spyropoulou, M.; Avramopoulos, H.; Kanellos, G. T.; Pleros, N.; Guina, M.

2014-03-01

137

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)

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.

2005-01-01

138

Three of Four GlnR Binding Sites Are Essential for GlnR-Mediated Activation of Transcription of the Amycolatopsis mediterranei nas Operon  

PubMed Central

In Amycolatopsis mediterranei U32, genes responsible for nitrate assimilation formed one operon, nasACKBDEF, whose transcription is induced by the addition of nitrate. Here, we characterized GlnR as a direct transcriptional activator for the nas operon. The GlnR-protected DNA sequences in the promoter region of the nas operon were characterized by DNase I footprinting assay, the previously deduced Streptomyces coelicolor double 22-bp GlnR binding consensus sequences comprising a1, b1, a2, and b2 sites were identified, and the sites were then mutated individually to test their roles in both the binding of GlnR in vitro and the GlnR-mediated transcriptional activation in vivo. The results clearly showed that only three GlnR binding sites (a1, b1, and b2 sites) were required by GlnR for its specific binding to the nas promoter region and efficient activation of the transcription of the nas operon in U32, while the a2 site seemed unnecessary. PMID:23543714

Wang, Ying; Wang, Jing-Zhi; Shao, Zhi-Hui; Yuan, Hua; Lu, Yin-Hua; Jiang, Wei-Hong

2013-01-01

139

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

E-print Network

/min. Estime a velocidade da água no propulsor. 3. Ao demonstrar algebricamente a conservação da energia, a energia por unidade de tempo recebida pela antena de Arecibo devida a um sinal com essa potência? O

140

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

E-print Network

(quantidade de energia por unidade de tempo) emitida por uma lâmpada incandescente. Para isso, utiliza um calor de um sistema A, que está a uma temperatura T , e transfere essa energia para um sistema A que? #12;8) Num experimento de espalhamento de partículas de altas energias, verifica- se que as partículas

141

t*iiBe*fe-bufriq.fs * frtus INSTITUTO DE PESQUISAS ESPACIAIS  

E-print Network

�oes: MARCIO NOGUEIRA BARBOSA MUCIO ROBERTO DIAS ADAIL CARLOS PEREIRA VOLKER W.J.H. KIRCHHOFF CL�VIS SoLANO PEREIRA LUIZ GYLVAN MEIRA FILHO ROBER�O PEREIRA DA CUNHA MIGUEL DRAGOMIR ZANIC CUELLAR JOSE LUIZ DE BARROS-tBDF). ii #12;Roberto Pereira da Cunha Coordenador da Opera��o EQUIPE T�CNICA ANTONIO ROBERTO FORMAGGIO

142

INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS CONCURSO PBLICO PARA PROVIMENTO DE VAGAS EM CARGOS DE  

E-print Network

PAULO BONATTI (PRESIDENTE) - INPE SILVIO NILO FIGUEROA RIVERO - INPE ENIO PEREIRA DE SOUZA - UFCG MEMBROS SUPLENTES DA COMISS?O EXAMINADORA: ENIO BUENO PEREIRA - INPE FRANCISCO CARLOS PARQUET BIZARRIA TITULARES DA COMISS?O EXAMINADORA: MARCO ANTONIO CHAMON (PRESIDENTE) - INPE ANTONIO MACILIO PEREIRA DE

143

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

PubMed Central

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

2011-01-01

144

Theoretical study on the composition dependence of Ga 8-nAs n ( n=0-8) clusters  

NASA Astrophysics Data System (ADS)

Using full-potential linear-muffin-tin-orbital molecular-dynamics (FP-LMTO-MD) method, we have investigated the dependence of GaAs clusters with eight atoms on composition. It is found that the ground state structures for Ga-rich and As-rich clusters are cube structures. As the ratio between gallium atoms and arsenic atoms is close to one, structural distortion become increasingly severe, or even the clusters adopt other geometrical configurations as their ground state structures. The energy gap Eg between the highest-occupied molecular orbital (HOMO) and the lowest-unoccupied molecular orbital (LUMO), and the vertical electron affinity show a certain degree of even/odd alternation with cluster composition. Among nine Ga 8-nAs n ( n=0-8) clusters, only a few of clusters have different energy orders between the ionic and neutral isomers with large binding energy. Some ionic structures would change into other configurations due to severe structural distortion.

Yu, Jian; Li, Bao-xing; Chu, Qiao-yan; Zhan, Shi-chang

2008-01-01

145

Proceedings of Institute of Mathematics of NAS of Ukraine 2002, Vol. 43, Part 2, 688690 On Multi-Parameter Families of Hermitian  

E-print Network

call a second-order operator in one variable Lie-algebraic if the following requirements are met of Mathematics of NAS of Ukraine, 3 Tereshchenkivska Str., 01601 Kyiv-4, Ukraine E-mail: spichak@imath.kiev.ua Five multi-parameter families of Hermitian exactly solvable matrix Schr¨odinger operators in one

Popovych, Roman

146

VARIAO NAS CARACTERSTICAS FSICAS E QUMICAS DA GUA DO RIO TOCANTINS A JUSANTE DA USINA HIDRELTRICA SERRA DA MESA (GO), EM DIFERENTES POCAS DO ANO  

Microsoft Academic Search

RESUMO O presente trabalho objetivou estudar a avaliao das caractersticas fsicas e qumicas das guas do rio Tocantins (TO), a jusante da UHE Serra da Mesa, nas pocas seca e chuvosa. Os dados foram coletados junto ao Projeto de Monitoramento Limnolgico do rio Tocantins a jusante da UHE Serra da Mesa, como integrante de um convnio firmado entre Universidade do

Daniela Alves Oliveira; Ricardo H. P. B. Peixoto; Cleverland Carvalho de Arajo; Oliveira Barros; Ana Mrcia; Fernandes da Cruz

147

Proceedings of Institute of Mathematics of NAS of Ukraine 2000, Vol. 30, Part 1, 190195. Lie Submodels of Rank 1 for MHD Equations  

E-print Network

Submodels of Rank 1 for MHD Equations Victor O. POPOVYCH Institute of Mathematics of NAS of Ukraine, 3 Tereshchenkivska Street, Kyiv, Ukraine The MHD equations describing flows of a viscous homogeneous incompressible- tigated. 1. Introduction. The MHD equations (the MHDEs) describing flows of a viscous homogeneous

Popovych, Roman

148

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

E-print Network

-broad spontaneous emission and modal gain spectrum from a hybrid quantum well/quantum dot laser structure Appl. Phys. Lett. 100, 041118 (2012) Time-dynamics of the two-color emission from vertical-external-cavity surfaceSelf-consistent gain analysis of type-II `W' InGaN­GaNAs quantum well lasers Hongping Zhao, Ronald

Gilchrist, James F.

149

Molecular beam epitaxy of GaNAs alloys with high As content for potential photoanode applications in hydrogen production  

SciTech Connect

The authors have succeeded in growing GaN1?xAsx alloys over a large composition range (0 < x < 0.8) by plasma-assisted molecular beam epitaxy. The enhanced incorporation of As was achieved by growing the films with high As{sub 2} flux at low (as low as 100 C) growth temperatures, which is much below the normal GaN growth temperature range. Using x-ray and transmission electron microscopy, they found that the GaNAs alloys with high As content x > 0.17 are amorphous. Optical absorption measurements together with x-ray absorption and emission spectroscopy results reveal a continuous gradual decrease in band gap from -3.4 to < 1 eV with increasing As content. The energy gap reaches its minimum of -0.8 eV at x - 0.8. The composition dependence of the band gap of the crystalline GaN{sub 1?x}As{sub x} alloys follows the prediction of the band anticrossing model (BAC). However, our measured band gap of amorphous GaN{sub 1?x}As{sub x} with 0.3 < x < 0.8 are larger than that predicted by BAC. The results seem to indicate that for this composition range the amorphous GaN{sub 1?x}As{sub x} alloys have short-range ordering that resembles random crystalline GaN{sub 1?x}As{sub x} alloys. They have demonstrated the possibility of the growth of amorphous GaN{sub 1?x}As{sub x} layers with variable As content on glass substrates

Novikov, S. V.; Staddon, C. R.; Foxon, C. T.; Yu, K. M.; Broesler, R.; Hawkridge, M.; Liliental-Weber, Z.; Walukiewicz, W.; Denlinger, J.; Demchenko, I.

2009-10-06

150

The influence of As/III pressure ratio on nitrogen nearest-neighbor environments in as-grown GaInNAs quantum wells  

NASA Astrophysics Data System (ADS)

The energy fine structure, corresponding to different nitrogen nearest-neighbor environments, was observed in contactless electroreflectance (CER) spectra of as-grown GaInNAs quantum wells (QWs) obtained at various As/III pressure ratios. In the spectral range of the fundamental transition, two CER resonances were detected for samples grown at low As pressures whereas only one CER resonance was observed for samples obtained at higher As pressures. This resonance corresponds to the most favorable nitrogen nearest-neighbor environment in terms of the total crystal energy. It means that the nitrogen nearest-neighbor environment in GaInNAs QWs can be controlled in molecular beam epitaxy process by As/III pressure ratio.

Kudrawiec, R.; Korpijrvi, V.-M.; Poloczek, P.; Misiewicz, J.; Laukkanen, P.; Pakarinen, J.; Dumitrescu, M.; Guina, M.; Pessa, M.

2009-12-01

151

Contactless electroreflectance study of band bending in Be-doped GaInNAs/GaAs quantum wells: The origin of photoluminescence enhancement  

NASA Astrophysics Data System (ADS)

Contactless electroreflectance (CER) has been applied to study band bending in Be-doped GaInNAs/GaAs quantum wells (QWs). It has been shown that (i) the sign of GaAs-related CER signal changes from positive to negative due to Be-doping and (ii) QW-related CER resonances disappear for Be-doped QWs whereas they are clearly observed for un-doped QWs. The two observations indicate a Be-related shift in the Fermi level above the hole levels in the QW region, i.e., the change in band bending in this system. The results point out that the experimentally-observed enhancement in QW photoluminescence upon Be-doping is associated with a better collection/confinement of photogenerated carriers by the Be-doped GaInNAs QW.

Kudrawiec, R.; Gladysiewicz, M.; Misiewicz, J.; Korpijrvi, V.-M.; Pakarinen, J.; Puustinen, J.; Laukkanen, P.; Laakso, A.; Guina, M.; Dumitrescu, M.; Pessa, M.

2010-07-01

152

Temperature dependence of photoluminescence from InNAsSb layers: The role of localized and free carrier emission in determination of temperature dependence of energy gap  

NASA Astrophysics Data System (ADS)

The temperature dependence of energy gap-related emission from InNAsSb layers was studied by Fourier transform infrared photoluminescence (PL) spectroscopy. The shape of PL peak was analyzed using a theoretical expression, which takes into account both the localized and free carrier emission. Proper accounting for those two effects is very important for an accurate determination of the Varshni and Bose-Einstein parameters from PL data. It is shown that nitrogen incorporation has a very week effect on the temperature induced bandgap reduction in InNAsSb alloys and that the Varshni and Bose-Einstein parameters are very close to those observed in InAs and InSb.

Latkowska, M.; Kudrawiec, R.; Janiak, F.; Motyka, M.; Misiewicz, J.; Zhuang, Q.; Krier, A.; Walukiewicz, W.

2013-03-01

153

A estabilidade dos PAHS em funo da energia da radiao interestelar nas faixas UV e raios-X  

NASA Astrophysics Data System (ADS)

A nebulosa CRL 618, uma proto-nebulosa planetria cuja nuvem molecular espessa envolve uma estrela B0, contm uma grande quantidade de C2H2 e CH4. Estas molculas so consideradas os tijolos da criao de grandes molculas carbonadas como os Hidrocarbonetos Policclicos Aromticos (PAHs). Esta nebulosa, por estar exposta a intensos campos de UV e Raios-X, uma regio de fotodissociao molecular que propicia a formao de novas molculas, confirmada pela presena de C4H2 e C6H6 (Benzeno), que a unidade bsica dos PAHs. Atribui-se a esta famlia de molculas orgnicas duas propriedades fundamentais, a resistncia para sobreviver ao campo de radiao UV interestelar e a gerao das bandas de emisso no identificadas (UIR) observadas no infravermelho. No entanto, alguns autores questionam a resistncia dos PAHs ao campo de radiao UV interestelar. Empregando a tcnica de Espectrometria de Massas por Tempo de Vo, no modo de coincidncia fotoeltron-fotoon, estudamos a ionizao e fragmentao das seguintes molculas: Benzeno, Benzeno deuterado, Naftaleno, Antraceno e Fenantreno. Utilizamos uma fonte de Hlio monocromtica em 21,21 eV (584,5 ) e a radiao Sncroton do Laboratrio Nacional de Luz Sncroton (LNLS) em diferentes energias nas proximidades da borda do C 1s ( 290 eV). Comprovamos a estabilidade dos PAHs sob ao de UV (21,21 eV), onde eles apresentam um baixo nvel de fotodissociao, produzindo fragmentos ionizados com rendimento total na ordem de 5 por cento em relao ao on molecular pai. Entretanto, em altas energias, na faixa de Raios-X, a quebra destas molculas torna-se mais intensa, com a produo de muitos fragmentos. Como uma das rotas de fragmentao do Naftaleno [(C10H8) = > (C6H6+) + (C4H2) + (e-)], e como temos as evidncias observacionais da existncia do C4H2 e C6H6 na nebulosa CRL 618, sugerimos que este ambiente tambm possui o Naftaleno.

Pinotti, R.; Costa, R. K.; Boechat-Roberty, H. M.; Lago, A.; Souza, G. B.

2003-08-01

154

Optimal Blast Condition for the Inner Surface of Mass Produced NAS Battery Cylindrical Aluminum Cell Containers as Pretreatment of Thermal Spraying  

Microsoft Academic Search

The relationship between roughness caused by blasting and adhesion of spray coatings on aluminum container substrates was studied through various experiments as part of measures for improving the adhesion of the 75mass%Cr-Fe alloy plasma spray coating for sulfi dation corrosion resistance, which is applied on the inner surface of cylindrical Al containers of high-temperature type NAS batteries. Surface roughness of

Takashi Ando; Yoshio Harada

2007-01-01

155

AVALIAO DA CAPACIDADE DE Stomoxys calcitrans (LINNAEUS, 1758) EM CARREAR BACTRIAS ENVOLVIDAS NAS ETIOLOGIAS DAS MASTITES DE MUNICPIOS DO RIO DE JANEIRO  

Microsoft Academic Search

3 ABSTRACT:- MORAES, A.P.R.; BADINI, P.V.; SOUZA, M.M.S. DE; BITTENCOURT, A.J. (Evaluation of Stomoxys calcitrans (Linnaeus, 1758) ability to carry bacteria involved in the etiology of mastitis in counties of Rio de Janeiro.) Avaliao da capacidade de Stomoxys calcitrans (Linnaeus, 1758) em carrear bactrias envolvidas nas etiologias das mastites de municpios do Rio de Janeiro. Revista Brasileira de Parasitologia Veterinria

ANA PAULA R. MORAES; PABLO V. BADINI; AVELINO J. BITTENCOURT

2004-01-01

156

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

SciTech Connect

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.

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

2009-01-01

157

Low-loss 1.3-microm GaInNAs saturable Bragg reflector for high-power picosecond neodymium lasers.  

PubMed

A novel low-loss, single-step-growth 1.3-microm GaInNAs saturable Bragg reflector mode-locking element has been developed. Combined radial thickness and postgrowth annealing control have permitted a tuning range of 46 nm for passive mode locking to be demonstrated from one wafer. With this structure, stabilized mode locking was obtained from quasi-cw diode-pumped Nd:YLF and Nd:YALO lasers operating at 1314 and 1342 nm, respectively, with average on-time output powers of as much as 20 W and pulse durations as low as 22 ps. PMID:18033462

Sun, H D; Valentine, G J; Macaluso, R; Calvez, S; Burns, D; Dawson, M D; Jouhti, T; Pessa, M

2002-12-01

158

Optical properties of multi-stacked InGaAs/GaNAs quantum dot solar cell fabricated on GaAs (311)B substrate  

SciTech Connect

Quantum dot solar cells (QDSCs) comprised of 10 stacked pairs of strain-compensated InGaAs/GaNAs QD structure have been fabricated by atomic hydrogen-assisted molecular beam epitaxy. A homogeneous and high-density QD array structure with improved in-plane ordering and total density of {approx}10{sup 12} cm{sup -2} has been achieved on GaAs (311)B grown at 460 Degree-Sign C after stacking. The external quantum efficiency (EQE) of InGaAs/GaNAs QDSC increases in the longer wavelength range due to additive contribution from QD layers inserted in the intrinsic region. The short-circuit current density measured for QDSC is 17.2 mA/cm{sup 2} compared to 14.8 mA/cm{sup 2} of GaAs reference cell. Further, an increase in EQE due to photocurrent production by 2-step photon absorption has been observed at room temperature though it is still small at around 0.1%.

Shoji, Yasushi [Research Center for Advanced Science and Technology (RCAST), University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan); Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan); Akimoto, Katsuhiro [Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573 (Japan); Okada, Yoshitaka [Research Center for Advanced Science and Technology (RCAST), University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904 (Japan)

2012-09-15

159

A model for the bandgap energy of the dilute nitride InGaNAs alloys by modifying simplified coherent potential approximation  

NASA Astrophysics Data System (ADS)

In this paper, a model describing the bandgap energy of the dilute nitride alloy InxGa1-xNyAs1-y is developed based on the modification of simplified coherent potential approximation (MSCPA) and the band anti-crossing model (BAC). The parameters in the model are obtained by fitting the experimental bandgap energies of the ternary alloys InGaAs, InGaN, GaNAs and InNAs. It is found that the results agree well with the experimental data. We also find that although the bandgap energies of InxGa1-xNyAs1-y and InxGa1-xAs can be calculated by using MSCPA, the physical mechanisms for the bandgap evolution of InxGa1-xNyAs1-y and InxGa1-xAs are very different. In addition, it is found that the model in this work may be used in a larger composition range than the BAC model.

Zhao, Chuan-Zhen; Qu, You-Yang; Wei, Tong; Sun, Xiao-Dong; Wang, Sha-Sha; Lu, Ke-Qing

2014-03-01

160

Influence of arsenic pressure on photoluminescence and structural properties of GaInNAs/GaAs quantum wells grown by molecular beam epitaxy  

NASA Astrophysics Data System (ADS)

We have investigated the photoluminescence and structural properties of GaInNAs/GaAs quantum wells grown by molecular beam epitaxy under different arsenic pressures with all the other fluxes kept constant. The best optical properties are achieved when the V/III beam equivalent pressure ratio (V/III BEP) is equal to 10. The emission wavelength remains unchanged for the V/III BEP ratios between 8 and 12, suggesting that within this range neither the alloy composition nor the nitrogen sticking coefficient is changed. For V/III BEP<8, incorporation of nitrogen into the crystal is enhanced and for V/III BEP>12 incorporation is reduced. Post-growth thermal annealing induces a spectral blue-shift, which decreases as the V/III BEP ratio is increased above 12. This phenomenon is likely due to combined effects of Ga/In interdiffusion and a change in the nearest neighbourhood of nitrogen.

Pavelescu, E.-M.; Hakkarainen, T.; Dhaka, V. D. S.; Tkachenko, N. V.; Jouhti, T.; Lemmetyinen, H.; Pessa, M.

2005-08-01

161

The energy-fine structure of GaInNAs /GaAs multiple quantum wells grown at different temperatures and postgrown annealed  

NASA Astrophysics Data System (ADS)

We report photoreflectance investigations of the energy-fine structure of GaInNAs /GaAs multiple quantum wells (MQWs) grown at different temperatures and postgrown treated by rapid thermal annealing (RTA). A "splitting" of the ground and excited QW transitious due to the presence of different nitrogen nearest-neighbor environments, i.e., N-Ga4-mInm(0?m ?4) short-range-order clusters, has been observed. The RTA induces a nitrogen redistribution between the five possible N-Ga4-mInm configurations and thus leads to a blueshift of QW transitions. The magnitude of the blueshift and its dependence on the growth temperature and annealing temperature are investigated in this paper.

Kudrawiec, R.; Pavelescu, E.-M.; Andrzejewski, J.; Misiewicz, J.; Gheorghiu, A.; Jouhti, T.; Pessa, M.

2004-09-01

162

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

NASA Astrophysics Data System (ADS)

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.

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

2014-10-01

163

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

164

Purification, crystallization and preliminary X-ray diffraction analysis of the non-ATPase subunit Nas6 in complex with the ATPase subunit Rpt3 of the 26S proteasome from Saccharomyces cerevisiae  

PubMed Central

The non-ATPase subunit Nas6, which is the human orthologue of gankyrin, was co-expressed with the C-terminal domain of the ATPase subunit Rpt3 of the yeast 26S proteasome in Escherichia coli, purified to near-homogeneity and crystallized using the hanging-drop vapour-diffusion method. The protein crystallized in space group P21, with unit-cell parameters a = 60.38, b = 100.22, c=72.20?, ? = 94.70 and with three Nas6Rpt3C molecules per asymmetric unit. The crystal diffracted to beyond 2.2? resolution using synchrotron radiation. PMID:17329811

Nakamura, Yoshihiro; Umehara, Takashi; Tanaka, Akiko; Horikoshi, Masami; Padmanabhan, Balasundaram; Yokoyama, Shigeyuki

2007-01-01

165

Greenhouse policy study from NAS  

NASA Astrophysics Data System (ADS)

The National Aeronautics and Space Administration announces the research proposal deadline for the Origins of Solar Systems Research Program as October 31, 1989, and November 1, 1989, for the Magellan Guest Investigator Program.Goals of the Origins of Solar Systems Research Program are to complement and extend ongoing research efforts in this area and to foster effective communications among active researchers on this topic. Proposals are encouraged which involve joint research efforts by investigators from different scientific disciplines. All categories of organizations are encouraged to participate, including industry, educational institutions, other nonprofit organizations, and other government agencies. Proposals should be submitted to Origins of Solar System Review Panel, The Lunar and Planetary Institute, 3303 NASA Road 1, Houston, TX 77058; tel 713-486-2149.

166

Nitrogen incorporation into GaInNAs lattice-matched to GaAs: The effects of growth temperature and thermal annealing  

NASA Astrophysics Data System (ADS)

We have studied the effects of growth temperature and subsequent thermal annealing on nitrogen incorporation into lattice-matched dilute Ga0.942In0.058NAs-on-GaAs epilayers, which were grown by the molecular-beam epitaxy method. The samples were studied experimentally by means of x-ray diffraction and Raman spectroscopy and theoretically by calculations within the density-functional theory. Over the entire range of growth temperatures applied (410-470 C), nitrogen appeared to be mainly located on substitutional sites in ``short-range-order clusters'' as N-Ga4 and, to a lesser extent, as N-Ga3In. There were also indications of the presence of nitrogen dimers NN, as suggested by Raman spectroscopy, in qualitative agreement with the calculations. An increase in growth temperature reduced the amount of substitutional nitrogen and decreased the number of N-Ga4 clusters relative to N-Ga3In. Postgrowth thermal annealing promoted the formation of In-N bonds and caused a blueshift in the optical band gap, which increased as the growth temperature was lowered.

Pavelescu, E.-M.; Wagner, J.; Komsa, H.-P.; Rantala, T. T.; Dumitrescu, M.; Pessa, M.

2005-10-01

167

Influence of non-radiative recombination on photoluminescence decay time in GaInNAs quantum wells with Ga- and In-rich environments of nitrogen atoms  

NASA Astrophysics Data System (ADS)

The influence of non-radiative recombination on the photoluminescence decay time (?PL) has been studied for GaInNAs/GaAs quantum wells with Ga- and In-rich environments of N atoms. At low temperatures, this influence is suppressed, due to the carrier localization phenomenon, which leads to a spectral dispersion of ?PL. For investigated samples, this dispersion has been found to be in the range of ~0.2-2.0 ns. With the temperature increase, the free exciton emission starts to dominate instead of the localized exciton emission and the dispersion of ?PL disappears. The dynamic of free exciton recombination is strongly influenced by the non-radiative recombination, which varies between samples, due to different concentration of non-radiative centers. The study of influence of non-radiative recombination on ?PL has been performed at 180 K, since this temperature is high enough to eliminate the localized emission and activate non-radiative recombination and low enough to observe excitonic emission without strong contribution of free carrier recombination when the sample is excited with low power. It was observed that, for as-grown samples, the ?PL increases from 0.14 to 0.25 ns with the change in As/III beam equivalent pressure ratio from 3.8 to 12.1 (in this case, it corresponds to the change in nitrogen nearest-neighbor environment from Ga- to In-rich), whereas, after annealing (i.e., also the change from Ga-rich to In-rich environment of N atoms), this time increases 2-4 times, depending on the As/III ratio. It has been concluded that the ?PL is influenced by point defects rather than the nitrogen nearest-neighbor environment, but their concentration is correlated with the type of nitrogen environment.

Kudrawiec, R.; Syperek, M.; Latkowska, M.; Misiewicz, J.; Korpijrvi, V.-M.; Laukkanen, P.; Pakarinen, J.; Dumitrescu, M.; Guina, M.; Pessa, M.

2012-03-01

168

Optimization of GaInNAs quantum-well vertical-cavity surface-emitting laser emitting at 2.33 ?m  

NASA Astrophysics Data System (ADS)

In the present paper, a comprehensive computer simulation is used to determine optimal structure of the InP-based GaInNAs quantum-well (QW) active region and to investigate a possibility of reaching room-temperature (RT) continuous-wave (CW) single-fundamental-mode 2.33-?m operation of vertical-cavity surface-emitting laser (VCSEL) with such an active region. From among various considered InP-based active regions, the one with the Ga0.15In0.85N0.015As0.985/Al0.138Ga0.332In0.530As QW, i.e. with barriers lattice matched to InP, seems to be optimal for the 2.33-?m VCSEL performance. Its QW material is chosen for the required long-wavelength emission whereas its barrier is expected to ensure promising laser performance at room and higher temperatures. The latter is mostly connected with the QW conduction band offset equal in the above active region to as much as 413 meV, which is much larger than those of its possible lattice matched to InP competitors, e.g. 276 meV for the Ga0.47In0.53As barrier and 346 meV for the Ga0.327In0.673As0.71P0.29 one. Our simulation reveals that from among various considered structures, a VCSEL with a 4-?m-diameter tunnel junction and two 6-nm Ga0.15In0.85N0.015As0.985/Al0.138Ga0.332In0.530As QWs exhibits the lowest calculated threshold current of 0.88 mA. Its promising RT CW performance suggests that it may represent a very interesting alternative to GaSb-based VCSELs.

Sarza?a, Robert P.; Piskorski, ?ukasz; Kudrawiec, Robert; Nakwaski, W?odzmierz

2014-06-01

169

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 is at P0. The UAV is launched at the red cross position into the launch orbit, and is then moved to the H1 holding orbit. Once the EP has moved from P0 to P1, the UAV acquires imagery over the first flight area

170

Physicochemical properties of the modeled structure of astacin metalloprotease moulting enzyme NAS-36 and mapping the druggable allosteric space of Heamonchus contortus, Brugia malayi and Ceanorhabditis elegans via molecular dynamics simulation.  

PubMed

Nematodes represent the second largest phylum in the animal kingdom. It is the most abundant species (500,000) in the planet. It causes chronic, debilitating infections worldwide such as ascariasis, trichuriasis, hookworm, enterobiasis, strongyloidiasis, filariasis and trichinosis, among others. Molecular modeling tools can play an important role in the identification and structural investigation of molecular targets that can act as a vital candidate against filariasis. In this study, sequence analysis of NAS-36 from H. contortus (Heamonchus contortus), B. malayi (Brugia malayi) and C. elegans (Ceanorhabditis elegans) has been performed, in order to identify the conserved residues. Tertiary structure was developed for an insight into the molecular structure of the enzyme. Molecular Dynamics Simulation (MDS) studies have been carried out to analyze the stability and the physical properties of the proposed enzyme models in the H. contortus, B. malayi and C. elegans. Moreover, the drug binding sites have been mapped for inhibiting the function of NAS-36 enzyme. The molecular identity of this protease could eventually demonstrate how ex-sheathment is regulated, as well as provide a potential target of anthelmintics for the prevention of nematode infections. PMID:24402824

Sharma, Om Prakash; Agrawal, Sonali; Kumar, M Suresh

2013-12-01

171

Ciliados nas cavidades do estmago de bovinos  

Microsoft Academic Search

O presente trabalho teve como objetivo identificar e quantificar os gneros de ciliados do rmen, retculo, omaso e abomaso de bovinos abatidos em matadouro municipal. Foram coletados 45ml de contedo de cada cavidade de 30 animais. No momento da coleta foram medidos temperatura e pH e as amostras posteriormente analisadas em laboratrio. Os resultados mostraram que o ambiente do rmen

G. M. M. Salvio

2001-01-01

172

F/NAS/ Pressure Temperature Retrieval Techniques  

NASA Technical Reports Server (NTRS)

The purpose of this investigation is to study methods and ways for rapid inversion programs involving the correlated k-method, and to modify the existing programs so that the rapid analysis of data can be accomplished. This short paper presents the background regarding the research as well as accomplishments made during the contract period.

Poularikas, Alexander

1995-01-01

173

The NAS perchlorate review: Adverse effects?  

SciTech Connect

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.

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

2005-11-01

174

NAS outlines best options for plutonium disposal  

Microsoft Academic Search

The best options for disposition of excess weapons-grade plutonium are fabrication into mixed-oxide fuel for use in existing reactors or vitrification with high-level radioactive waste, a National Academy of Sciences panel has concluded. The academy's Committee on International Security and Arms Control said a third option was burial in deep boreholes, although it said more research was needed to determine

Lobsenz

1994-01-01

175

NAS Report Reveals Dangers From SST  

ERIC Educational Resources Information Center

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

Fowler, Jo Ann V.

1973-01-01

176

F/NAS/ Pressure Temperature Retrieval Techniques  

NASA Technical Reports Server (NTRS)

The purpose of this investigation is to study methods and ways for rapid inversion programs involving the correlated k-method, and to modify the existing programs so that the rapid analysis of data can be accomplished. The earth's atmosphere as well as those around the planets consist of gases which emit radiation in the infrared spectral region, providing wealth of information about chemical and physical processes in the atmosphere. The atmospheric molecular constituents absorb and radiate by vibrational and rotational transitions, and the observed spectra exhibit characteristic spectral features in the region of the electromagnetic spectrum. The observed absorption or thermal emission spectra may be obtained with space-borne high resolution infrared spectrometers the 50-1000 micrometers spectral region. A detailed analysis of the observed spectra leads to information about the atmospheric thermal structure, composition, and the physical and chemical processes. The analytic techniques involve the development of radiative transfer models for the calculation of the observed radiance and transmittances for realistic atmospheric conditions and observational geometries, and the development of inversion methods for retrieval of atmospheric parameters from the observations.

Poularikas, Alexander

1998-01-01

177

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)

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.

Schrijver, K.; Knoelker, M.

1999-05-01

178

Comparison of leading parallel NAS file systems on commodity hardware  

SciTech Connect

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.

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

2010-11-08

179

A cincia nas utopias de Campanella, Bacon, Comenius, e Glanvill  

Microsoft Academic Search

This article evaluates the role that science and technolo- gy plays in the societies described by early modern utopias, making a com- parative analysis of Tommasio Campanella's City of Sun, Francis Bacon's New Atlantis, Jan Ams Comenius' Panorthosia, and Joseph Glanvill's The summe of my lord Bacon's New Atlantis. Palavras-chave utopias, imaginrio social, progresso, cincia moder- na

Bernardo Jefferson de Oliveira

2002-01-01

180

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...

181

NAS/NAE Committee on the Prospects for IFE Systems  

E-print Network

-drive--with the potential of higher gains · TheOmegaLaserFacilityisbeingusedtodevelopdirect-driveIFE concepts--hot spot and shock ignition · Hot-spotcryogenicimplosionshaveachievedperformancecomparable to magnetic fusion 400 200 65-nm thick DT ice65-nm thick DT ice

182

Band Anticrossing in GaInNAs Alloys  

Microsoft Academic Search

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

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

183

UAS Integration in the NAS Project and Future Autonomy Research  

NASA Technical Reports Server (NTRS)

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.

Johnson, Charles W.

2014-01-01

184

NAS Albuquerque 3/20/11 National Academy of Science  

E-print Network

is conceived as a "2nd Generation Scheme" for ICE 3/30/2011 5 #12;ght ressure oresholein oronal asma ght 200 300 400 500 600 Full divergence cone angle 40o Fluor depth Imagewidth CCD Laserr K fluor Bragg

185

TRANSFORMING THE NAS: THE NEXT GENERATION AIR TRAFFIC CONTROL SYSTEM  

Microsoft Academic Search

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

Heinz Erzberger

186

O Conceito de Resilincia Aplicado ao Trabalho nas Organizaes  

Microsoft Academic Search

Resilience is a concept that has been used to explain psychosocial phenomena referred to individuals, groups or organizations that surpass or transcend adverse situations. In this study, the use of the concept of resilience as a theoretical referential in the field of Psychology of Work is discussed through: a) content analysis of two recent films - Frida and Life is

Lisete Barlach; Ana Cristina Limongi-Frana; Sigmar Malvezzi

2008-01-01

187

Facilitation and inhibition of male rat ejaculatory behaviour by the respective 5-HT1A and 5-HT1B receptor agonists 8-OH-DPAT and anpirtoline, as evidenced by use of the corresponding new and selective receptor antagonists NAD-299 and NAS-181  

PubMed Central

Ejaculatory problems and anorgasmia are well-known side-effects of the SSRI antidepressants, and a pharmacologically induced increase in serotonergic neurotransmission inhibits ejaculatory behaviour in the rat. In the present study the role of 5-HT1A and 5-HT1B receptors in the mediation of male rat ejaculatory behaviour was examined by use of selective agonists and antagonists acting at these 5-HT receptor subtypes.The 5-HT1A receptor agonist 8-OH-DPAT (0.254.00??mol?kg?1 s.c.) produced an expected facilitation of the male rat ejaculatory behaviour, and this effect was fully antagonized by pretreatment with the new selective 5-HT1A receptor antagonist (R)-3-N,N-dicyclobutylamino-8-fluoro-3,4-dihydro-2H-1-benzopyran-5-carboxamide hydrogen (2R,3R) tartrate monohydrate (NAD-299) (1.0??mol?kg?1 s.c.). NAD-299 by itself (0.753.00??mol?kg?1 s.c.) did not affect the male rat ejaculatory behaviour.The 5-HT1B receptor agonist anpirtoline (0.254.00??mol?kg?1 s.c.) produced a dose-dependent inhibition of the male rat ejaculatory behaviour, and this effect was fully antagonized by pretreatment with the 5-HT1B receptor antagonist isamoltane (16??mol?kg?1 s.c.) as well as by the new and selective antagonist (R)-(+)-2-(3-morpholinomethyl-2H-chromene-8-yl)oxymethylmorpholino methansulphonate (NAS-181) (16??mol?kg?1 s.c.). Isamoltane (1.016.0??mol?kg?1 s.c.) and NAD-181 (1.016.0??mol?kg?1 s.c.) had no, or weakly facilitatory effects on the male rat ejaculatory behaviour. The non-selective 5-HT1 receptor antagonist (?)-pindolol (8??mol?kg?1 s.c.), did not antagonize the inhibition produced by anpirtoline.The present results demonstrate opposite effects, facilitation and inhibition, of male rat ejaculatory behaviour by stimulation of 5-HT1A and 5-HT1B receptors, respectively, suggesting that the SSRI-induced inhibition of male ejaculatory dysfunction is due to 5-HT1B receptor stimulation. PMID:9886765

Hillegaart, Viveka; Ahlenius, Sven

1998-01-01

188

Astronomia Motivadora no Ensino Fundamental  

NASA Astrophysics Data System (ADS)

O objetivo principal deste trabalho procurar desenvolver o interesse dos alunos pelas cincias atravs da Astronomia. Uma pesquisa com perguntas sobre Astronomia foi realizada junto a 161 alunos do Ensino Fundamental, com o intuito de descobrir conhecimentos prvios dos alunos sobre o assunto. Constatou-se, por exemplo, que 29,3% da 6ª srie responderam corretamente o que eclipse, 30,0% da 8ª srie acertaram o que a Astronomia estuda, enquanto 42,3% dos alunos da 5ª srie souberam definir o Sol. Pretende-se ampliar as turmas participantes e trabalhar, principalmente de forma prtica com: dimenses e escalas no Sistema Solar, construo de luneta, questes como dia e noite, estaes do ano e eclipses. Busca-se abordar, tambm, outros contedos de Fsica tais como a ptica na construo da luneta, e a mecnica no trabalho com escalas e medidas, e ao utilizar uma luminria para representar o Sol na questo do eclipse, e de outras disciplinas como a Matemtica na transformao de unidades, regras de trs; Artes na modelagem ou desenho dos planetas; a prpria Histria com relao busca pela origem do universo, e a Informtica que possibilita a busca mais rpida por informaes, alm de permitir simulaes e visualizaes de imagens importantes. Acredita-se que a Astronomia importante no processo ensino aprendizagem, pois permite a discusso de temas curiosos como, por exemplo, a origem do universo, viagens espaciais a existncia ou no de vida em outros planetas, alm de temas atuais como as novas tecnologias.

Melo, J.; Voelzke, M. R.

2008-09-01

189

Comparison of Bilingual Children on the WISC-R and the Escala De Inteligencia Wechsler Para Ninos.  

ERIC Educational Resources Information Center

A comparison of bilingual Puerto Rican students' scores showed no significant differences between the Full Scale and the Verbal Scale scores on both tests, but significant differences between the Verbal and Performance Scale scores on both tests. Caution in testing bilingual children before determination of bilinguality is recommended. (Author)

Oplesch, Marie; Genshaft, Judy

1981-01-01

190

Valoracin del prejuicio racial en la infancia: adaptacin preliminar de la escala de prejuicio racial sutil y manifiesto  

Microsoft Academic Search

The study develops the Spanish adaptation for children of Pettigrew and Meertens (1995) Racial Prejudi- ce Scale. Our aim is: 1) to offer an instrument that can discriminate between this type of views during childho- od; 2) to search for data in this population confirming that children differentiate between two forms of racial prejudice that currently seem to have great

ANTONIO FERNNDEZ-CASTILLO; JOS-DIONISIO FERNNDEZ

191

EFICIENCIA TCNICA Y ESCALAS DE OPERACIN EN PESCA PELGICA: UN ANLISIS DE FRONTERAS ESTOCSTICAS (Pesquera Centro-Sur en Chile)  

Microsoft Academic Search

Este trabajo presenta estimaciones de eficiencia tcnica en labores de pesca de la flota industrial en la pesquera pelgica Centro-Sur de Chile (regiones V a la X), con datos para 204 barcos a lo largo de 11 aos (1985-95). Usamos un enfoque de fronteras estocsticas, segn un modelo de estimacin a la Battese-Coelli (1995). Los resultados de estimacin rechazan la

Julio Pea-Torres; Michael Basch; Sebastian Vergara

192

Structural and optical properties of GaInAs /GaAs and GaInNAs /GaNAs multiple quantum wells upon postgrowth annealing  

NASA Astrophysics Data System (ADS)

We have investigated structural and optical properties of Ga1-xInxAs/GaAs and Ga1-xInxNyAs1-y/GaNzAs1-z multiple quantum wells. The evolution of x-ray diffraction rocking curves during thermal treatment of the samples indicates that there is observable Ga /In interdiffusion across the heterointerfaces at high sample temperatures. X-ray diffraction also indicates that the diffusion length of the atoms decreases with an increase in nitrogen concentration, while the interface roughness, which exhibits remarkable changes for the two different quantum wells, only plays a minor role in diffusion. Structural stability of the Ga1-xInxNyAs1-y/GaNzAs1-z quantum wells against temperature variations is better than that of the Ga1-xInxAs/GaAs quantum wells. These observations can be accounted for by assuming that nitrogen has a tendency to suppress Ga /In interdiffusion across the heterojunctions.

Liu, H. F.; Xiang, N.; Chua, S. J.; Pessa, M.

2006-05-01

193

Genesis. Author manuscript Nas transgenic mouse line allows visualization of Notch pathway activity  

E-print Network

into the complex and various functions of the Notch signalling pathway. MESH Keywords Animals ; Arteries pathway in vertebrates. In particular,in vivo genetic studies in mice have pointed to many roles development and arterial identity acquisition (reviewed

Paris-Sud XI, Université de

194

Cultura de aula de matemtica presente nas narrativas de formao por professores do ensino fundamental  

Microsoft Academic Search

This text is about th e research is inserted in the scope of the Project of Improvement of Public Teaching Representations of infancy and youth in school culture , supported by Fapesp, developed next to a municipal public school (Itatiba-SP). From a work shared with the teachers of this school, narratives of formation were produced by the teachers, allowing to

Valria Galvo; Frana Cezari; Regina Clia Grando

195

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

NASA Technical Reports Server (NTRS)

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.

Glaab, Patricia C.

2011-01-01

196

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

SciTech Connect

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.

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

2006-03-01

197

A INFLUNCIA DE AGREGADOS GRADOS DE DIFERENTES MINERALOGIAS NAS PROPRIEDADES MECNICAS DO CONCRETO DE ALTO DESEMPENHO  

Microsoft Academic Search

Concrete in normal conditions is a versatile and strong construction material. However under certain environmental conditions it may deteriorate in a short period of time. This fact has led researchers in recent times to develop the high-performance concrete. In this scenario, the aim of this paper is to present the effects of the different types of coarse aggregate on the

A. G. Magalhes; E. P. de Frana; M. T. P. Aguilar; J. M. Calixto; W. L. Vasconcelos

198

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

E-print Network

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 ...

Weibel, Roland E

2005-09-26

199

A IMPORTNCIA DO ESTUDO DE VIABILIDADE ECONMICA DE PROJETOS NAS ORGANIZAES COMTEMPORNEAS  

Microsoft Academic Search

Organizations are faced with several challenges. Among them is the planning of investments in new projects given the uncertainties of the market. This study aims to discuss the importance of examining economic and financial viability of projects, based on the analysis of the acquisition of new equipment for the syrup to a soft drinks factory located in Rio Grande do

Camila Avozani Zago; Andreas Dittmar Weise; Ricardo Andr Hornburg

200

Empirical tight-binding model for the electronic structure of dilute GaNAs alloys  

NASA Astrophysics Data System (ADS)

We present an empirical tight-binding (TB) model for the electronic structure of GaNxAs1-x with nitrogen content x<5%, over the entire Brillouin zone. The model upgrades existing TB schemes, introducing an additional s orbital to account for the N-induced change of conduction-band states. The resulting band structure is analyzed using an sp3d5s* TB parametrization and compared to experimental and other theoretical data. The model reproduces the results of the band anticrossing model at the ? point of the Brillouin zone, and the dependence of the X and L band-edge states on the N concentration is in good agreement with experimental data. The model is readily applicable to electronic structure calculations of other III-N-V compounds and heterostructures.

Shtinkov, N.; Desjardins, P.; Masut, R. A.

2003-02-01

201

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

E-print Network

PDZ domain Chingakham R. Singh,a Scott Lovell,b Nurjahan Mehzabeen,b Wasimul Q. Chowdhury,a Eric S. Geanes,a Kevin P. Battailec and Jeroen Roelofsa* aDivision of Biology, Kansas State University, 338 Ackert Hall, Manhattan, KS 66506, USA, b...

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

2014-04-01

202

tica e justia nas pesquisas sediadas em comunidades: o caso de uma pesquisa  

E-print Network

,emuitoparticularmenteaquelesdebeneficênciaedejustiça.Essegênerodepráticacientífica implica um desdobramento da responsabilidade dos pesquisadores, entre a pesquisa e a ação. Palavras envolvidos. Segundo o caso, chama-se aos grupos concernidos de "comunidades", "sociedade civil" ou "público esclarecimento da esfera de responsabilidade dos pesquisadores. 1 As pesquisas participativas: qualidades e

Paris-Sud XI, Université de

203

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

NASA Technical Reports Server (NTRS)

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).

Buoni, Gregory P.; Howell, Kathleen M.

2008-01-01

204

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

SciTech Connect

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 agreements Statement of Work between DOE and NA and consistent with an Annual Work Plan developed by DOE and NA.

Douple, Evan B.

2006-05-31

205

QUESTES EPISTEMOLGICAS NAS ICONICIDADADES DE REPRESENTAES VISUAIS EM LIVROS DIDTICOS DE FSICA  

Microsoft Academic Search

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

Alexandre Medeiros; Cleide Medeiros

206

Selfish grid computing: game-theoretic modeling and NAS performance results  

Microsoft Academic Search

Selfish behaviors of individual machines in a Grid can potentially damage the performance of the system as a whole. However, scrutinizing the Grid by taking into account the non- cooperativeness of machines is a largely unexplored research prob- lem. In this paper, we first present a new hierarchical game- theoretic model of the Grid that matches well with the physical

Yu-kwong Kwok; Shanshan Song; Kai Hwang

2005-01-01

207

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

E-print Network

perceptions of systemic inequity and economic inefficiency. This paper describes the properties associated interests of all citizens"[7], the reality of equitable allocation of scarce resources is elusive [6, 5

208

ESTUDO DO IMPACTO DA VARIAO DOS MEIOS DE HOSPEDAGEM NAS DESTINAES TURSTICAS  

Microsoft Academic Search

O turismo, diferente de outras reas, constitui-se de um ramo de atividades executadas por pessoas que, em determinadas situaes, tornam-se turistas. Como a rea de estudo, o turismo recente e vem sendo matria de pesquisa em diversos campos com mais tradio como a sociologia, a economia, a geografia, a psicologia, dentre outras. Principalmente pelo fato de ser um campo

Jos Gustavo Ferreira Candelria

2008-01-01

209

AN INTELLIGENT CONTROL ARCHITECTURE FOR UNMANNED AERIAL SYSTEMS (UAS) IN THE NATIONAL AIRSPACE SYSTEM (NAS)  

Microsoft Academic Search

In recent times, Unmanned Aerial Systems (UAS) have been employed in an increasingly diverse range of applications. Numerous UAS market forecasts portray a burgeoning future, with many applications in both the military and civilian domains. Within the civilian realm, UAS are expected to be useful in performing a wide range of missions such as disaster monitoring (e.g. wildfires, earth-quakes, tsunamis

Pritesh Narayan; Paul Wu; Duncan Campbell; Rodney Walker

210

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

NASA Technical Reports Server (NTRS)

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.

Randall, Debra K.

2014-01-01

211

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

Code of Federal Regulations, 2012 CFR

...Adjusting Correcting, and Testing System System Percent Pneumatic Tube System 10 Incinerators (medical waste and trash...General supply conveyors 10 Food service conveyors 10 Pneumatic soiled linen and trash system 10 Elevators and...

2012-10-01

212

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

Code of Federal Regulations, 2010 CFR

...Adjusting Correcting, and Testing System System Percent Pneumatic Tube System 10 Incinerators (medical waste and trash...General supply conveyors 10 Food service conveyors 10 Pneumatic soiled linen and trash system 10 Elevators and...

2010-10-01

213

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

Code of Federal Regulations, 2011 CFR

...Adjusting, Correcting, and Testing System System Percent Pneumatic tube system 10 Incinerators (medical waste and trash...General supply conveyors 10 Food service conveyors 10 Pneumatic soiled linen and trash system 10 Elevators and...

2011-10-01

214

The good, the bad, the ugly: the NAS report on strengthening forensic science in America.  

PubMed

In the long run, the NRC report can only have a salutary effect on forensic science. Although the report is not exhaustive in its review of the relevant literature and the law, and although broad constituencies may never embrace its most radical proposals, the report exposes the soft underbelly of a range of technologies, the organizational problems with the institutions that generate forensic science evidence, and the timidity of the courts in pushing for better science. Even if the full promise of the report is not realized, its publication ultimately should strengthen the good in a system of law and science that has its fair share of the good, the bad, and the ugly. PMID:20408376

Kaye, David H

2010-03-01

215

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

NASA Technical Reports Server (NTRS)

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."

Shively, Jay; Fern, Lisa; Rorie, Conrad

2014-01-01

216

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

E-print Network

como o consumo #12;de tabaco ou de álcool, a obesidade, o espírito de cooperação, a solidão ou obesidade, co- mo também o facto de ter um amigo de amigo obeso e mesmo um amigo de amigo de amigo obeso (o social" entre as pes- soas aumentava, mas mesmo assim, a obesidade surgia como algo suscep- tível de ser

Instituto de Sistemas e Robotica

217

Quem so as crianas que esto nas ruas: vtimas ou vitimizadoras?  

Microsoft Academic Search

Who are the street children: victims or bullies? Life in the street is permeated by risk factors, such as violence, adult caregivers absence, drugs, dangers. These are constant challenges turning this population extremely vulnerable. The exposition to daily risky situations can have a negative impact on the population, specially on street children. Therefore the effect of street life on these

Santos Paludo; Silvia Helena Koller

218

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

NSDL National Science Digital Library

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.

Qaissaunee, Michael; Snyder, Gordon F.

2008-03-13

219

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

NASA Technical Reports Server (NTRS)

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).

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

2000-01-01

220

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

NASA Technical Reports Server (NTRS)

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.

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

2014-01-01

221

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

Code of Federal Regulations, 2013 CFR

...Pneumatic Tube System 10 Incinerators (medical waste and trash) 5 Sewage treatment plant equipment 5 Water treatment...10 Food service conveyors 10 Pneumatic soiled linen and trash system 10 Elevators and dumbwaiters 10 Materials...

2013-10-01

222

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

Code of Federal Regulations, 2013 CFR

...Pneumatic tube system 10 Incinerators (medical waste and trash) 5 Sewage treatment plant equipment 5 Water treatment...10 Food service conveyors 10 Pneumatic soiled linen and trash system 10 Elevators and dumbwaiters 10 Materials...

2013-10-01

223

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

Code of Federal Regulations, 2011 CFR

...Pneumatic Tube System 10 Incinerators (medical waste and trash) 5 Sewage treatment plant equipment 5 Water treatment...10 Food service conveyors 10 Pneumatic soiled linen and trash system 10 Elevators and dumbwaiters 10 Materials...

2011-10-01

224

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

Code of Federal Regulations, 2012 CFR

...Pneumatic tube system 10 Incinerators (medical waste and trash) 5 Sewage treatment plant equipment 5 Water treatment...10 Food service conveyors 10 Pneumatic soiled linen and trash system 10 Elevators and dumbwaiters 10 Materials...

2012-10-01

225

O JOGO DRAMTICO E O IMAGINRIO DE ALUNOS NAS AULAS DE TEATRO  

Microsoft Academic Search

The aim of this paper is to present how it was possible the apprehension of the students imaginary through the theater-education, using the methodological orientations of Jean Pierre Ryngaert about the dramatic games, under the epistemological view of the Imaginary Anthropology of Gilbert Durand. During the research the scenes were constructed without abandoning the necessary practices to the actor formation

Sueli Barbosa Thomaz

2007-01-01

226

Will They Blend?: Exploring Big Data Computation atop Traditional HPC NAS Storage  

E-print Network

is tailored to work on massively parallel file systems unlike the Hadoop Distributed File System (HDFS to avoid them. Last, we design and present a novel Hadoop File System, the Reliable Array of Independent], and BigTable [15] tools and their open source siblings, Hadoop [4], its distributed file system (HDFS) [11

227

United States and available alternative energy sources. [Summary of NAS\\/CONAES study  

Microsoft Academic Search

This article is a summary of the National Academy of Sciences' Committee on Nuclear and Alternative Energy systems (CONAES) study. The CONAES study emphasized the challenges facing the United States in the medium term, when the country will have to make a transition from major dependence on fossil hydrocarbons to utilization of other available or renewable energy sources. Energy conservation

Maalouf

1980-01-01

228

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

Microsoft Academic Search

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

McHenry

1990-01-01

229

NATIONAL AERONAUTICS AND SPACE ADMINI/STRATION CONTRACT NO. NAS 7-918 ~  

E-print Network

a Kuiper Belt object can be transported to become a Jupiter comet, eventually evolving into an asteroid to identify dangerous asteroids on collision courses with Earth, and low-ener- gy strategies for deflecting. Ll and L2 act as gate keepers for the approach and capture of comets and asteroids by a planet

Lo, Martin

230

NAS Parallel Conjugate Gradient Benchmark on the Cray T3D  

E-print Network

, the CG kernel. This kernel was implemented on one of the newest massively­parallel supercomputers­instruction/ multiple­data (MIMD) machine. It consists of a variable number of process­ ing elements (PE's) connected

Kolda, Tamara G.

231

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

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;

Gentry, Curtis

232

Validez y confiabilidad de una escala para evaluar la calidad de vida en adultos Validity and reliability of a scale to assess the quality of life in adults  

Microsoft Academic Search

Quality of life is a relevant term in the human sciences area and behaviour sciences, particularly in health psychology, and it allows to explain the conditions and ways of life of people by means of psychological instruments. In this case, an instrument for assess quality of life assessment was applied to 281 individuals. Results indicate a high validity and the

Julio Csar; Verdugo Lucero; Rosa Martha; Meda Lara; Jorge Guzmn Muiz; Norma Anglica; Moy Lpez; Carlos Eduardo; Monroy Galindo

2007-01-01

233

Sensores Fotograficos: Conceitos Basicos (Photographic Sensors: Basic Concepts).  

National Technical Information Service (NTIS)

This paper of photographic systems is prepared for the Postgraduate course on Remote Sensing of the Instituto de Pesquisas Espaciais (INPE) and is suitable both as teaching material or as reference. It provides almost all aspects of photography, taking an...

C. C. Liu, J. E. Rodrigues

1986-01-01

234

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

NASA Technical Reports Server (NTRS)

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.

Saini, Subhash

1995-01-01

235

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

NASA Technical Reports Server (NTRS)

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.

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

2005-01-01

236

Proceedings of Institute of Mathematics of NAS of Ukraine 2000, Vol. 30, Part 1, 231238. Modelling System for Relaxing Media.  

E-print Network

with unknown affinity A of the relaxing process. Connection between the "internal" and "external" variables) To describe the long nonlinear waves propagation in such media, the following system may be proposed [3]: ui) where M, and N are functions connected with internal energy E and affinity of the relaxing processes

Popovych, Roman

237

Carta aberta ao Inep quanto adoo do Exame Nacional do Ensino Mdio critrio de ingresso nas Universidades  

E-print Network

�dio (ENEM). Desde 2009 diversas medidas do governo estimularam a amplia��o de sua utiliza��o como�cadas. Muitas s�o as quest�es que poderiam ser levantadas sobre o ENEM, mas duas dizem respeito diretamente�ncias da Natureza. Das 15 quest�es de F�sica na edi��o de 2012 do ENEM ele encontrou quatro quest�es sem

Barbosa, Marcia C. B.

238

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

Federal Register 2010, 2011, 2012, 2013

...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...

2013-02-26

239

Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 1, 5254 On Equivariant Boundary Value Problems  

E-print Network

Luxemburg Str., 83114 Donetsk, Ukraine E-mail: burskii@iamm.ac.donetsk.ua We describe an investigation conditions V1), V2) for any solvable expansion LB the following decomposition of the domain D(L) is valid: D on boundary . The action of group G on domain ¯ generates a representation of the group G in function spaces

Popovych, Roman

240

Recent advances in the development of yellow-orange GaInNAs-based semiconductor disk lasers  

NASA Astrophysics Data System (ADS)

We review recent results concerning the development of dilute nitride based semiconductor disk lasers. We have demonstrated over 7.4 W of output power at the second harmonic wavelength (around 590 nm) using a ?-BBO crystal. Over 10 W has been demonstrated at ~1.2 ?m, and multi-watt output power has been achieved at 589 nm with narrow linewidth (?? < 20 MHz).

Leinonen, T.; Korpijrvi, V.-M.; Hrknen, A.; Guina, M.

2012-03-01

241

A Tale of Two Approaches The NAS Report and the Law Commission Consultation Paper on Forensic Science  

Microsoft Academic Search

Recent publications from the National Academy of Science (USA) and the Law Commission (UK) provide an interesting contrast in approach to well documented and historic problems with the use of scientific\\

Rhonda M Wheate; Allan Jamieson

2010-01-01

242

INFLUNCIA DE TRATAMENTOS TERMOMECNICOS NAS PROPRIEDADES MECNICAS E ELTRICAS DE LIGAS Cu-Ni-Pt e Cu-Ni-Sn  

Microsoft Academic Search

RESUMO O cobre e suas ligas tm diferentes aplicaes na sociedade moderna devido as excelentes propriedades eltricas, condutividade trmica, resistncia corroso e outras propriedades. Estas aplicaes podem ser em vlvulas, tubulaes, sistemas para absoro de energia solar, radiadores para automveis, condutor de corrente, condutor eletrnico, elementos de termostatos. Dentre estas ligas utilizadas podemos destacar Cu-Be, Cu-Sn e Cu-Pt. O

Elias da Silva; W. A. Monteiro; Lineu Prestes

243

Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 2, 617628 Complex Extension of Quantum Mechanics  

E-print Network

Extension of Quantum Mechanics Carl M. BENDER Department of Physics, Washington University, St. Louis, MO but do possess PT symmetry. For example, consider the one-parameter family of Hamiltonians H = p2 + x2 8 has a different spectrum from the Hamiltonian that is obtained by continuing #12;618 C.M. Bender 1

Popovych, Roman

244

A QUESTO DE GNERO NAS AULAS DE EDUCAO FSICA A QUESTION OF GENDER IN THE LESSONS OF PHYSICAL EDUCATION  

Microsoft Academic Search

Currently, we live in a society marked by exclusion, among them there is the question of gender. In the classes of physical education, witnessed this division so clear, when teachers reinforce discriminatory patterns of behaviors in his speech. The purpose of this study was to analyze the relationship of gender in the gym class and the actual performance of the

Anglica da Fonseca Campos; Maria Eunice de Paiva Freitas; Lcia Aparecida da Cruz

245

ELEMENTOS METODOLGICOS PARA ANLISE DINMICA DA ESTRUTURA PRODUTIVA NAS REGIES DE INTEGRAO DO TOCANTINS E CARAJS, PAR AMAZNIA - BRASIL  

Microsoft Academic Search

Este artigo tem a finalidade de analisar as atividades e estabelecimentos de duas Regies de Integrao do Estado do Par - Tocantins e Carajs - nos anos de 2000, 2005 e 2010 atravs da anlise de indicadores econmicos que definem as economias dos municpios de acordo com a Matriz Bidimensional do Dinamismo Econmico. O trabalho obteve resultados coerentes com a

Heriberto Wagner Amanajs Pena; Joo Alberto Feio Maynart Tenrio; Jlia Helena Maia do Nascimento; Nayara Alencar Moriconi; Pamela da Silva Coelho

2012-01-01

246

AN EDGE-PRESERVING ANATOMICAL-BASED REGULARIZATION TERM FOR THE NAS-RIF RESTORATION OF SPECT IMAGES  

E-print Network

for the assessment of neurological and cerebrovascular diseases. However, due to the scattering of the emitted anatomical and geometrical informa- tion extracted from a high resolution anatomical magnetic resonance (MR of an unsupervised Markovian segmentation obtained af- ter a preliminary registration step between the MR and SPECT

Mignotte, Max

247

EL DESARROLLO DE HABILIDADES EN LAS PERSO- NAS CON NECESIDADES EDUCATIVAS ESPECIALES A TRAVS DE LA EXPRESIN PLSTICA  

Microsoft Academic Search

SUMARIO: En todos los niveles de enseanza las asignaturas relacionadas con la Educacin Artstica estn perdiendo importancia frente a la relevancia de las materias instrumentales. Sin embargo resulta imprescindible la enseanza en la creatividad y el pensamiento divergente; aspectos que de inmediato nos hacen pensar en la Expresin Plstica. Ms all las enseanzas artsticas resultan una herramienta ideal para el

Jos Lobato Suero; Magdalena Martnez; Isabel Molinos Lara

248

Performance Evaluation of the Concurrent Execution of NAS Parallel Benchmarks with BYTE Sequential Benchmarks on a Cluster  

Microsoft Academic Search

Computers of a non-dedicated cluster are often idle (users attend meetings, have lunch or coffee breaks) or lightly loaded (users carry out simple computations). These underutilized computers can be employed to execute parallel applications not only during weekends and at nights but also during office hours. Thus, they have to be shared by parallel and sequential applications which could lead

Andrzej M. Goscinski; Adam K. L. Wong

2005-01-01

249

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

E-print Network

-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

Popovych, Roman

250

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

E-print Network

-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

Popovych, Roman

251

Observao do abrilhantamento de limbo solar e de estruturas filamentares em 48 ghz utilizando a tcnica de regularizao adaptativa  

NASA Astrophysics Data System (ADS)

O radiotelescpio do Itapetinga tem sido utilizado em campanhas de observaes de exploses solares gerando um grande nmero de mapas dirios em 48 GHz como sub-produto destas observaes. A resoluo espacial do telescpio de 14m do Itapetinga nesta freqncia de aproximadamente dois minutos de arco. Estruturas de interesse para anlise da atmosfera solar quiescente tais como os filamentos e o anel de abrilhantamento do limbo so de dimenso angular moderada da ordem ou ligeiramente menores que a resoluo do telescpio. conhecido que a convoluo da funo de espalhamento do telescpio, PSF (padro de ganho do feixe) borra as estruturas de dimenso angular abaixo do HPBW (largura a meia potncia do feixe) e portanto comum a busca por tcnicas de restaurao que eliminem pelo menos em parte este borramento. Estudamos a restaurao destas radioimagens usando a tcnica de regularizao adaptativa e os resultados ressaltam estas estruturas espaciais de pequeno contraste. O algoritmo da regularizao adaptativa faz uso de k imagens, chamadas prottipos, obtidas atravs da variao de parmetros de um filtro de regularizao. Para controle da qualidade da restaurao utilizamos uma imagem de alta resoluo espacial obtida na linha H-a e a PSF do Itapetinga para borr-la. Pequenos desvios, entre a PSF utilizada para o borramento e a PSF utilizada na restaurao, produziram alguns desvios notveis na imagem restaurada porm a adio de rudo nas simulaes de restaurao foram mais influentes no clculo da rugosidade da imagem e portanto mais limitante para a restaurao. Apresentamos como nosso primeiro resultado uma imagem em 48 GHz com a presena clara do abrilhantamento de limbo que no estava evidente na imagem original e traos de estruturas filamentares, porm ainda sem grande evidncia.

Machado, W. R. S.; Mascarenhas, N.; Costa, J. E. R.; Silva, A. V. R.

2003-08-01

252

Reconstruo tridimensional de arcos magnticos por tomografia  

NASA Astrophysics Data System (ADS)

Uma exploso solar uma variao sbita do brilho que ocorre nas regies ativas da atmosfera solar. Estas regies so constitudas por um plasma magnetizado com intensa induo magntica e em cenrios bem complexos como visto recentemente atravs de experimentos embarcados em satlites operando instrumentos em raios X moles e ultra-violeta distante. A energia magntica, que pode ser armazenada por um perodo de horas at dias em configuraes magnticas estressadas, subitamente lanada na atmosfera solar e transferida para partculas como eltrons, prtons e ncleos pesados, que so acelerados e/ou aquecidos, produzindo radiao eletromagntica. A proposta final deste projeto determinar as caractersticas espaciais de alta resoluo da emisso e polarizao girossincrotrnica de exploses solares em ambientes complexos de campos magnticos. Os recentes resultados da emisso difusa em EUV apresentado pelos satlites TRACE e SOHO dos arcos magnticos conectando as diferentes polaridades magnticas sobre as regies ativas possibilitam novas abordagens sobre o papel do campo magntico na emisso em rdio. Nesta etapa apresentamos os resultados da reconstruo da geometria tridimensional das linhas de fora destes arcos utilizando tcnicas tomogrficas, a partir de imagens de alta resoluo espacial obtidas pelo instrumento EIT (Extreme ultraviolet Imaging Telescope), alm da modelagem das indues magnticas por um campo dipolar e as densidades de partculas aceleradas. Utilizamos para a reconstruo geomtrica, imagens tomadas em vrios ngulos dos arcos devido rotaco solar. Com estes resultados, daremos continuidade ao projeto, com os clculos da transferncia radiativa nos modos ordinrio e extraordinrio de propagao da radiao girossincrotrnica de exploses solares.

Simes, P. J. A.; Costa, J. E. R.

2003-08-01

253

Brazilian version of the Burden Interview scale for the assessment of burden of care in carers of people with mental illnesses Verso brasileira da escala Burden Interview para avaliao de sobrecarga em cuidadores de indivduos com doenas mentais  

Microsoft Academic Search

Introduction: Burden on informal carers of people with mental or physical illnesses has been studied for a long time. Several standardized instruments for the assessment of carer's burden have been developed. The Burden Interview is one of the most frequently used instruments. The aim of the present study is to examine the internal consistency and validity of the Brazilian version

Marcia Scazufca

254

XXII CONGRESO LATINOAMERICANO DE HIDRULICA CIUDAD GUAYANA, VENEZUELA, OCTUBRE 2006 ESTIMACIN DEL COSTE MARGINAL DE OPORTUNIDAD DEL RECURSO MEDIANTE MODELOS HIDRO-ECONMICOS A ESCALA DE CUENCA. APLICACIN AL SISTEMA DEL RO MIJARES EN ESPAA  

Microsoft Academic Search

The European Water Framework Directive establishes a common water policy framework, emphasizing the aspects of water quality and economics. The WFD requires the recovery of the costs of water services, including environmental and resource costs. Resource cost is often related to the opportunity cost of an economically inefficient water allocation. This paper shows the application of a methodology and hydro-economic

Eduardo lvarez Mendiola; Manuel Pulido Velzquez; Joaqun Andreu

255

DESENVOLVIMENTO E OPERAO DE REATOR ANAERBIO DE MANTA DE LODO (UASB) NO TRATAMENTO DOS EFLUENTES DA SUINOCULTURA EM ESCALA LABORATORIAL Development and operation of an upflow anaerobic sludge blanket reactor (UASB) treating liquid effluent from swine manure in laboratory scale  

Microsoft Academic Search

The swine production, since 70 th , is one of the most pollutant agro-industrial activities in the Minas Gerais State, Brazil. The objective of this research was to develop an Upflow Anaerobic Sludge Blanket Reactor (UASB), aiming at treating the effluent generated within a maximum efficiency and minimum time and cost. Therefore, a lab-scale reactor was built up and monitored

Cludio Milton; Montenegro Campos; Fernanda Ribeiro do Carmo; Cludio Gouva Botelho; Claudionor Camilo da Costa

256

Variabilidade da frequncia cardaca, estresse, ansiedade e depresso em intensivistas : um estudo nas unidades de terapia intensiva da cidade de Dourados, MS.  

E-print Network

??Dissertao (mestrado)Universidade de Braslia, Faculdade de Cincias da Sade, 2009. Fundamento: Ansiedade, depresso e estresse tm sido associados baixa variabilidade da freqncia cardaca (VFC) (more)

Longhi, Allan

2009-01-01

257

Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 3, 10511052 On the Gauge Groups of Particle Physics  

E-print Network

­1052 On the Gauge Groups of Particle Physics and Their Quantum Deformations1 Jules BECKERS Institute of Physics unimodular and unitary SU(n, C)-Lie groups have already played very important roles in particle physics extensively studied so that their impact inside particle physics developments [5] is a natural inquiry

Popovych, Roman

258

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

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.

Archambeau, C.B.

1992-12-01

259

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

PubMed Central

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 3T and persist to temperatures as high as 20K, 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

2014-01-01

260

Plasma-Assisted MOCVD Growth of GaAs\\/GaN\\/GaAs Thin-Layer Structures by NAs Replacement Using N-Radicals  

Microsoft Academic Search

GaAs\\/GaN\\/GaAs thin-layer structures were grown by plasma-assisted low-pressure metalorganic chemical vapor deposition. GaN layers were formed by exposing the surfaces of GaAs epitaxial layers to nitrogen-radical fluxes. When the nitrogen amount exceeded that in one-monolayer-thick GaN, the GaN\\/GaAs interfaces deteriorated drastically. Low-temperature photoluminescence from the structures suggests that the two-dimensional growth of GaN is limited to one-monolayer thick and that

Michio Sato

1995-01-01

261

Influncia da substituio parcial de cimento por cinza ultrafina da casca de arroz com elevado teor de carbono nas propriedades do concreto  

Microsoft Academic Search

This paper describes the use of ultrafine rice husk ash with high-carbon content in ordinary and high-strength concretes. The influence of ultrafine ash (10, 15 and 20% of cement replacement, in mass) on rheology (yield stress and plastic viscosity), compressive strength (7, 28, 90, and 180 days) and rapid chloride-ion penetrability was investigated. In addition, two experiments were carried out

Guilherme Chagas Cordeiro; Eduardo de Moraes; Rego Fairbairn; Guilherme Chagas

262

INFLUNCIA DO DESCAROAMENTO NAS CARACTERSTICAS TECNOLGICAS DA FIBRA DO ALGODO ANALISADAS PELO HVI (HIGH VOLUME INSTRUMENTS) E PELO AFIS (ADVANCED FIBER INFORMATION SYSTEM)1  

Microsoft Academic Search

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

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

263

Proceedings of Institute of Mathematics of NAS of Ukraine 2000, Vol. 30, Part 2, 387391. PP-Test for Integrability of Some Evolution  

E-print Network

of analytical continuation to obtain general solutions. For this procedure to work a complete knowledge ordinary poles. This special analytical property now carries his name and in what follow will be referred (Riccati equations, elliptic functions, linear equations) and the other six in spite of having meromorphic

Popovych, Roman

264

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

PubMed Central

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 700C 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

2012-01-01

265

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

PubMed

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 700C 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

Sarcan, Fahrettin; Donmez, Omer; Gunes, Mustafa; Erol, Ayse; Arikan, Mehmet Cetin; Puustinen, Janne; Guina, Mircea

2012-01-01

266

COMPORTAMENTO PRODUTIV O E CARACTERSTICAS PS-COLHEIT A DE HBRIDOS COMERCIAIS DE MELO AMARELO, CUL TIVADOS NAS CONDIES DO LITORAL DO CEAR 1  

Microsoft Academic Search

In order to evaluate fruit yield and quality of yellow melon, an assay was carried out at EMBRAPA\\/ Tropical Agroindustry Research Station, in Pacajus-CE, in the period from September to December, 2000. Nine melon hybrids were screened under field conditions at the east coast of Cear State. The experimental layout was a randomized complete block design with nine treatments and

Aurlio Antas Miguel; Joo Licnio; Nunes de Pinho; Joo Ribeiro Crisstomo; Roseli Freire de Melo

267

Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 3, 13431347 Dynamics of Sharp Interfaces in One-, Two-Phase  

E-print Network

Equations Anvar KACIMOV and Sergio SERRANO Department of Soil and Water Sciences, Sultan Qaboos University, Al-Khod-123, PO Box 34, Muscat, Oman E-mail: anvar@squ.edu.om Department of Civil ones using the Adomian decomposition method and separation of variables. For a periodic water

Popovych, Roman

268

Influncia da aplicao de um programa de estiramentos estticos, aps contraces excntricas, nas manifestaes clnicas e bioqumicas de leso muscular esqueltica  

Microsoft Academic Search

Effects of a static stretching program on clinical and biochemical markers of muscle damage induced by eccentric exercise. The aims of this study were to determine if the quadriceps static stretching, (i) alone, induces aggression in the integral muscle, and if (ii) done after physical exercise, intensifies the muscular aggression clin- ical and biochemical manifestations. Twenty-seven young sedentary male subjects

R. Torres

269

Proceedings of Institute of Mathematics of NAS of Ukraine 2002, Vol. 43, Part 1, 314320 R-Matrix Approach to the KrallSheffer Problem  

E-print Network

]). They classified all possible normal forms of the operators satisfying the required properties. It was shown in [3 83114, Ukraine E-mail: zhedanov@kinetic.ac.donetsk.ua 3 Department of Mathematics and Statistics of finding all polynomial eigenfunctions of second order linear differential operators in two variables

Popovych, Roman

270

Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 3, 11921194 On Spectrum of Matrix-Valued Continuous Functions  

E-print Network

@imath.kiev.ua A spectrum of matrix-valued continuous functions of a family of self-adjoint commuting) is the characteristic function, i = 1, m. Then denote a decomposition m ? i=1 i = Supp E , where the common measure­1194 On Spectrum of Matrix-Valued Continuous Functions of a Family of Commuting Operators Yevgenii Ye. SAMOILENKO

Popovych, Roman

271

Proceedings of Institute of Mathematics of NAS of Ukraine 2002, Vol. 43, Part 2, 478485 Jacobson Generators of (Quantum) sl(n + 1|m).  

E-print Network

§ Institute for Nuclear Research and Nuclear Energy, Boul. Tsarigradsko Chaussee 72, 1784 Sofia, Bulgaria E in terms of Chevalley generators has the advantage that the comultiplication, co-unit and antipode are easy Generators of (Quantum) sl(n + 1|m). Related Statistics T.D. PALEV , N.I. STOILOVA and J. VAN der JEUGT

Popovych, Roman

272

jPET: an Automatic Test-Case Generator for Java Elvira Albert, Israel Caba~nas, Antonio Flores-Montoya, Miguel Gomez-Zamalloa, Sergio Gutierrez  

E-print Network

memory (or heap) which contain the conditions to execute the different paths (or branches) of the tree to estimate how well the program is exercised by a test suite. Examples of coverage criteria are statement coverage, which requires that each instruction of the code is exercised, path coverage which requires

Politécnica de Madrid, Universidad

273

Avaliação do programa “Circuito Sul-mineiro de Cafeicultura nas regiões Sul e Sudoeste do estado de Minas Gerais  

Microsoft Academic Search

Aiming at the maintenance of the prominence of the South Minas coffee culture in the national scenario, the state of Minas Gerais, by means of its public institutions, has created a regional development program to meet the main problems concerning regional coffee production. With that purpose, the Southern Minas Ambit of Coffee culture was established, in search of the following

Marcelo Marcio Romaniello; Marcos Affonso Ortiz Gomes; Luis Carlos Ferreira de Souza Oliveira; Paulo Tacito Gontijo Guimaraes; Gabriel Ferreira Bartholo

2004-01-01

274

An estimate of the enroute noise of an advanced turboprop airplane NASA-TM-87302 E-3020 NAS 1.15:87302 HC A02/MF A01  

NASA Technical Reports Server (NTRS)

The enroute noise of an Advanced Turboprop powered aircraft was estimated. The measured noise levels were roughly equivalent in annoyance to the noise 15.24 m from an automobile traveling at 80 km/h. It is felt that these levels would not illicit noise complaints from urban areas during the day but might be a slight annoyance in rural areas or in urban areas at night. Although it is not felt that the enroute noise is a major problem, it is indicated that a reduction in the enroute noise could improve the acceptability of advance turboprop airplanes.

Dittmar, J. H.

1986-01-01

275

Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 1, 204210 Symmetry Methods Applied to a Mathematical Model  

E-print Network

to reach the periphery of the tumour. This does affect how well a particular treatment works. We consider Methods Applied to a Mathematical Model of a Tumour of the Brain Sibusiso MOYO and P.G.L. LEACH Dept. of Math. and Centre Center for Research Systems, Durban Institute of Technology, PO Box 953, Steve Biko

Popovych, Roman

276

Proceedings of Institute of Mathematics of NAS of Ukraine 2004, Vol. 50, Part 3, 11011107 Classical Dynamical YangBaxter Equations  

E-print Network

Kharkiv, Ukraine § Department of Mathematics, University of G¨oteborg, SE-412 96 G¨oteborg, Sweden E such that the corresponding subalgebra u g is reductive in g (i.e., there exists an u-invariant subspace m g such that g = u-equivariant function r : D g g that satisfies the classical dynamical Yang­Baxter equation (CDYBE): Alt(dr) + CYB

Popovych, Roman

277

Atomic-scale compositional structure of InAsP/InP and InNAsP/InP heterostructures grown by molecular-beam epitaxy  

E-print Network

into the InAsxP1 x alloy layers has been shown to produce a substantial decrease in band gap,8 can partially gap,13 band-edge discontinuities, and transport properties.14­17 In addition, the InNxAsyP1 x y /In the atomic-scale structure of InAs0.35P0.65 /InP and InN0.01As0.35P0.64 /InP strained-layer multiple quantum

Yu, Edward T.

278

Processamento de dados multiespectrais termais aplicado anlise espao-temporal dos padres de temperatura da superfcie nas Regies Metropolitanas de So Paulo e Rio de Janeiro  

Microsoft Academic Search

The heterogeneity of land use and land cover in urban areas causes great spatial variation of the thermal surfaces. The results of radiometric changes of five thermal channels of ASTER data, with 90 m spatial resolution, made it possible to obtain surface temperature images for two dates in each of So Paulo and Rio de Janeiro Metropolitan Regions. Despite the

Marcus Andre Fuckner

279

CERIMNIA DO 25 ANIVERSRIO DO LABORATRIO DE INTEGRAO E TESTES DO INPE  

E-print Network

órgão de execução para o desenvolvimento das pesquisas espaciais, no âmbito civil", no Brasil a responsabilidade pelo projeto, fabricação, integração e operação de 4 satélites, bem como a implantação da

280

Heterogeneity of Soils and Vegetation in an Eastern Amazonian  

E-print Network

Heterogeneity of Soils and Vegetation in an Eastern Amazonian Rain Forest: Implications for Scaling, Massachusetts 02543, USA; 2 Instituto Nacional de Pesquisas Espaciais, Sa~o Jose´ dos Campos, SP, Brazil; and 3 Institute of Ecology and Resource Management, University of Edinburgh, Edinburgh EH9 3JU, Scotland ABSTRACT

281

Surface and Coatings Technology 169170 (2003) 379383 0257-8972/03/$ -see front matter 2003 Elsevier Science B.V. All rights reserved.  

E-print Network

were implanted by plasma immersion ion implantation on Si wafers. The vacuum arc plasma gun has Elsevier Science B.V. All rights reserved. PII: S0257-8972Z03.00053-7 Magnesium plasma immersion ion, a a b b Instituto Nacional de Pesquisas Espaciais, Laboratorio Associado de Plasmas, Av. dos Astronautas

282

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

. Knyazikhin, and R. B. Myneni are with the Department of Geography, Boston University, Boston, MA 02215 USA (e of Geography and the Environment, University of Oxford, Oxford, OX1 3TB, U.K. and also with the Instituto Na.P. 515, Brazil. Y. E. Shimabukuro is with the Instituto Nacional de Pesquisas Espaciais, Di- visão de

Myneni, Ranga B.

283

Agricultural and Forest Meteorology 182183 (2013) 111127 Contents lists available at ScienceDirect  

E-print Network

, Brazil p School of Geography, University of Leeds, Leeds LS2 9JT, UK q Key Laboratory of Semi , Xubin Zenggg a Centro de Previsão do Tempo e Estudos Climáticos (CPTEC), Cachoeira Paulista, SP, Brazil b Instituto Nacional de Pesquisas Espaciais (INPE), Brazil c Earth System Science Interdisciplinary

Jain, Atul K.

284

Climatic shift in patterns of shallow clouds over the Amazon  

Microsoft Academic Search

The Amazon rain forest has experienced dramatic changes in the past 50 years due to active deforestation. As of 2001, 15% of the 4,000,000 km2 Brazilian Amazon has been deforested [Instituto Nacional de Pesquisas Espaciais (INPE), 2003]; each year, agricultural exploitation claims an estimated 13,000 km2 of tropical forest [Achard et al., 2002]. In this paper we investigate the climatic

F. J. F. Chagnon; R. L. Bras; J. Wang

2004-01-01

285

To appear in, Proc. of NAS Workshop on Assessing the Economic Impacts of Climate Change, April 2010, and special issue of, Energy Economics Uncertainties in Technology Experience Curves for  

E-print Network

technological learning in which the rate of technological improvement and/or cost reduction depends on other, and special issue of, Energy Economics Uncertainties in Technology Experience Curves for Energy curves) relating reductions in the unit cost of energy and environmental technologies to their cumulative

286

The National Academies | Science in the Headlines | New Research Mim... http://www.nas.edu/headlines/20060124.html 1 of 1 1/27/2006 8:03 AM  

E-print Network

-334-2138 Fax: 202-334-2158 Print this New Research Mimics Nuclear Matter By Lisa Pickoff-White January 24 in magnetized superconductors. Several National Research Council reports deal with nuclear and condensed-matter physics. Nuclear Physics: The Core of Matter, The Fuel of Stars examines research goals for physicists

287

Two Ohio State researchers elected to National Academy of Sciences Two Ohio State professors have been elected to the National Academy of Sciences (NAS), one of the most prestigious  

E-print Network

-borne diseases that infect food and fiber-producing animals, companion animals, and humans. Her research focuses of the scientific innovation that results from the nation's investment in clinical research that can benefit human Research Forum is an organization comprising the nation's most prestigious academic medical centers

288

Analysis of glucose-dependent insulinotropic peptide receptor (GIPR) and luteinizing hormone receptor (LHCGR) expression in human adrenocortical hyperplasia Anlise da expresso dos receptores do peptdeo insulinotrpico dependente de glicose (GIPR) e do hormnio luteinizante (LHCGR) nas hiperplasias adrenocorticais humanas  

Microsoft Academic Search

Objective: To analyze the aberrant expression of the GIPR and LHCGR in different forms of adrenocortical hyperplasia: ACTH-independent macronodular adrenal hyperplasia (AIMAH), primary pigmented nodular adrenocortical disease (PPNAD) and diffuse adrenal hyperplasia secondary to Cushing's disease (DAHCD). Methods: We quantified GIPR and LHCGR expres- sions using real time PCR in 20 patients with adrenocortical hyperplasia (seven with AIMAH, five with

Marcia Helena; Soares Costa; Sorahia Domenice; Ana Claudia Latronico; Regina Matsunaga Martin; Mirian Yumie Nishi; Antonio Marmo Lucon; Berenice Bilharinho Mendonca

2009-01-01

289

AS AREIAS COLORIDAS E O LABIRINTO DAS FALSIAS: O TURISMO COMO FATOR DE TRANSFORMAO DAS PAISAGENS NAS PRAIAS DE MORRO BRANCO E DAS FONTES NO MUNICPIO DE BEBERIBE-CEAR  

Microsoft Academic Search

RESUMO O litoral brasileiro atrai muitas pessoas para o cenrio de suas praias, a fim de se realizarem passeios e diferentes atividades tursticas. O turismo cearense se destaca por ser desenvolvido principalmente na costa cearense, em seus 573 Km de extenso. O municpio de Beberibe com um litoral de aproximadamente 52 km possui diferentes paisagens naturais favorveis ao desenvolvimento do

Juliana Maria Oliveira Silva

2004-01-01

290

Inexistncia de Diferenas de Sexo no Fator g (Inteligncia Geral) e nas Habilidades Especficas em Crianas de Duas Capitais Brasileiras There are no Sex Differences on g Factor and Specific Abilities in Children from Two Brazilian Capitals  

Microsoft Academic Search

Resumo O presente trabalho pretendeu examinar diferenas relacionadas ao sexo no fator g (inteligncia geral) e em habilidades especficas em crianas de duas cidades brasileiras: Belo Horizonte e Porto Alegre. No caso da amostra mineira (n=1,316), a idade compreendeu entre 5 e 11 anos de idade examinada atravs de uma bateria de testes a qual incluiu instrumentos de inteligncia (Raven,

Carmen E. Flores-Mendoza; Marcela Mansur-Alves; lvaro Jos Lel; Denise Ruschel Bandeira

291

Geoprocessamento aplicado ao mapeamento dos impactos socioambientais decorrentes das formas de uso da terra nas reas de Preservao Permanente (APPs) da Represa de Salto Grande no municpio de Americana (SP)  

Microsoft Academic Search

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 So Paulo. It takes care of, in the present time, to the inhabitants of the cities of Americana, Paulnia and Nova Odessa, that also use the source for activities

Joyce Rodrigues da Cruz

292

[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

Intelligence in the War with Japan, 190405: Secret Operations on Land and at Sea. Routledge Studies in the History of Russia and Eastern Europe. London: Routledge, 2007. xvii + 254 pp. $135.00. ISBN 0-415-41618-3. Modern conflicts are characterized... prowess. This was not always the case. Premodern wars were fought with the belligerents having little knowledge of their enemies or their capabilities. The significance of intelligence gathering began to grow in the nineteenth century...

Greenberg, Marc L.

2008-01-01

293

Realizacao domestica e escolar de foto e video 3D  

E-print Network

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.

Jose J. Lunazzi

2012-12-19

294

Realizacao domestica e escolar de foto e video 3D  

E-print Network

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 convenc...

Lunazzi, Jose J

2012-01-01

295

Galbahe C1 y C2 Tests de Lengua (Castellano. Escalas 1 y 2). Medida del nivel de Castellano para ninos de 7-8 y 10-11 anos. Manual de Aplicacion. Glotodidaktika-Lanak 27. (Galbahe Language Tests C1 and C2--Spanish, Scales 1 and 2. Measure of Level of Spanish for Children 7-8 and 10-11 years. Test administration Manual. Glotodidaktika-Lanak Series Number 27).  

ERIC Educational Resources Information Center

The Galbahe Language Tests C1 and C2 measure the Spanish language proficiency of children aged 7 to 8 years (C1) and those aged 10 to 11 years (C2). Equivalent tests E1 and E2 measure the Basque language achievement of the same age groups, respectively. Both tests were designed as part of a study of teaching of the Basque language in parts of

Sierra, Josu; Olaziregi, Ibon

296

VIII PREMI UPF DE TREBALL DE RECERCA EN ENGINYERIA I MATEMTICA APLICADA.  

E-print Network

'automobilisme Institut El Castell Esparreguera Energia solar. Sostenibilitat a l'Escala Institut El Pedró L'Escala Estudi Pujol i Bosch Premià de Dalt Contra el joc pervers de les elèctriques, moguem fitxa; estalvi d'energia

Geffner, Hector

297

Three Nicotianamine Synthase Genes Isolated from Maize Are Differentially Regulated by Iron Nutritional Status  

PubMed Central

Nicotianamine synthase (NAS) is an enzyme that is critical for the biosynthesis of the mugineic acid family of phytosiderophores in graminaceous plants, and for the homeostasis of metal ions in nongraminaceous plants. We isolated one genomic NAS clone, ZmNAS3, and two cDNA NAS clones, ZmNAS1 and ZmNAS2, from maize (Zea mays cv Alice). In agreement with the increased secretion of phytosiderophores with Fe deficiency, ZmNAS1 and ZmNAS2 were positively expressed only in Fe-deficient roots. In contrast, ZmNAS3 was expressed under Fe-sufficient conditions, and was negatively regulated by Fe deficiency. This is the first report describing down-regulation of NAS gene expression in response to Fe deficiency in plants, shedding light on the role of nicotianamine in graminaceous plants, other than as a precursor in phytosiderophore production. ZmNAS1-green fluorescent protein (sGFP) and ZmNAS2-sGFP were localized at spots in the cytoplasm of onion (Allium cepa) epidermal cells, whereas ZmNAS3-sGFP was distributed throughout the cytoplasm of these cells. ZmNAS1 and ZmNAS3 showed NAS activity in vitro, whereas ZmNAS2 showed none. Due to its duplicated structure, ZmNAS2 was much larger (65.8 kD) than ZmNAS1, ZmNAS3, and previously characterized NAS proteins (3038 kD) from other plant species. We reveal that maize has two types of NAS proteins based on their expression pattern and subcellular localization. PMID:12913155

Mizuno, Daichi; Higuchi, Kyoko; Sakamoto, Tatsuya; Nakanishi, Hiromi; Mori, Satoshi; Nishizawa, Naoko K.

2003-01-01

298

Deforestation and Biogenic Trace Emissions from Brazilian Cerrado  

NASA Technical Reports Server (NTRS)

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.

Sinha, Ravi; Geol, P.

1996-01-01

299

Instantnea de nanotecnologa  

Cancer.gov

Resumen bsico de la nanotecnologa, la cual consiste en el diseo y la creacin de dispositivos tan pequeos que solo pueden medirse a escala molecular. Tambin se incluye informacin sobre las investigaciones que realiza el NCI en este campo.

300

Efficient Species-Level Monitoring at the Landscape BARRY R. NOON  

E-print Network

tendencias poblacionales de m´ultiples especies animales en la escala de paisaje es prohibitivamente costoso cambios en la abundancia de animales y proporciona ideas de la probabilidad de persistencia de una especie

301

Parsec-scale radio structures in Quasars  

NASA Astrophysics Data System (ADS)

Very Long Baseline Interferometry (VLBI) con su nueva extensin para el radio telescopio orbital, VSOP/HALCA, ofrece una incomparable resolucin angular alcanzando escalas de milisegundos y submilisegundos de arco a longitudes de onda de centmetros. En este trabajo presentamos observaciones y anlisis de estructuras en radio, en escalas de parsec, para 3 radio fuentes extragalcticas de la muestra de VSOP Survey y 1 quasar, 1442+101, del proyecto `VSOP High Redshift'.

Coldwell, G.; Paragi, Z.; Gurvits, L.

302

Modelacin hidrogeolgica del contacto granito-bentonita en la galera FEBEX  

E-print Network

OF THE RIGHT PARAMENT Lamprophyre Dyke Fractures 50m 55m 60m 65m 70m LamprophyreFr-2 Fr-5 Estructuras a escala Lamprophyre Principales estructuras a escala FEBEX #12;0. 50.m W E Fr-1 Fr-2 Fr-3 Fr-4 Fr-6 Fr-7 Fr-8 Fr-S1-1 FUG-2 FUG-3 Estructuras que se identificaron como "de interés para el proyecto" #12;Pequeño dique

Politècnica de Catalunya, Universitat

303

As conferncias pan-americanas: identidades, unio aduaneira e arbitragem (1889-1928).  

E-print Network

??O presente trabalho analisa as manifestaes brasileiras nas Conferncias Pan-Americanas, entre 1889 e 1928. Busca-se compreender os discursos identitrios construdos pelos pases representados nas Conferncias, (more)

Tereza Maria Spyer Dulci

2008-01-01

304

Identification of Communication and Coordination Issues in the U. S. Air Traffic Control System  

E-print Network

Todays 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 ...

Davison, Hayley

305

Flying Unmanned Aircraft: A Pilot's Perspective.  

National Technical Information Service (NTIS)

The National Aeronautics and Space Administration (NASA) is pioneering various Unmanned Aircraft System (UAS) technologies and procedures which may enable routine access to the National Airspace System (NAS), with an aim for Next Gen NAS. These tools will...

M. E. Pestana

2011-01-01

306

NASA Altix 512P SSI  

NASA Technical Reports Server (NTRS)

This paper presents a general overview of NASA Advances Supercomputing (NAS). The topics include: 1) About NASA Advanced Supercomputing (NAS); 2) System Configuration; 3) Our Experience with the Altix; and 4) Future Plans.

Chan, Davin

2004-01-01

307

48 CFR 832.111 - Contract clauses for non-commercial purchases.  

Code of Federal Regulations, 2010 CFR

...or contract does not contain a section entitled Network Analysis System (NAS), the contracting officer must...solicitation or contract contains a section entitled Network Analysis System (NAS), the contracting officer...

2010-10-01

308

Long-term outcome following selective serotonin reuptake inhibitor induced neonatal abstinence syndrome  

Microsoft Academic Search

Objective:To assess the long-term neurodevelopment of children exposed in utero to selective serotonin reuptake inhibitors (SSRIs) that developed a neonatal abstinence syndrome (NAS).Study Design:Neurodevelopmental evaluation was performed at the age of 2 to 6 years. Children who developed NAS were compared with those who did not using univariate and logistic regression analyses.Result:Thirty children with NAS and 52 without NAS participated

G Klinger; D Frankenthal; P Merlob; G Diamond; L Sirota; R Levinson-Castiel; N Linder; B Stahl; D Inbar

2011-01-01

309

Study of unmanned aircraft systems procedures: Impact on air traffic control  

Microsoft Academic Search

The demand for unmanned aircraft systems (UAS) access to the National Airspace System (NAS) is increasing as agencies find more ways to use them to complete their missions. The Department of Defense (DoD) flies UASs in the NAS primarily for training and some operational missions, the National Aeronautics and Space Administration (NASA) flies UASs in the NAS for scientific missions,

Jill Kamienski; Elliott Simons; Steven Bell; Steven Estes

2010-01-01

310

Utopia e Fico Cientfica: a \\  

Microsoft Academic Search

Minha gerao, cuja infncia e adolescncia transcorreram nas dcadas de 1960 e 1970, assistiu na TV e no cinema muita fico cientfica. De certo modo, minhas expectativas sobre o futuro foram moldadas por sries como Jornada nas Estrelas e filmes como Guerra nas Estrelas. As narrativas de fico cientfica proliferaram ao nosso redor. E nelas, ingenuamente, eu procurei respostas para

Marcos Lobato Martins

311

Naphthenic acids inhibit root water transport, gas exchange and leaf growth in aspen (Populus tremuloides) seedlings.  

PubMed

Effects of sodium naphthenates (NAs) on root hydraulic conductivity (Lp) and gas exchange processes were examined in aspen (Populus tremuloides Michx.) seedlings grown in solution culture. Exposure of roots to NAs for 3-5 weeks significantly decreased Lp and stomatal conductance. Root-absorbed NAs also decreased leaf chlorophyll concentration, net photosynthesis and leaf growth. Short-term (< or = 2 h) exposure of excised roots to NAs significantly decreased root water flow (Qv) with a concomitant decline in root respiration. We conclude that NAs metabolically inhibited Lp, likely by affecting water channel activity, and that this inhibition could be responsible for the observed reductions in gas exchange and leaf growth. PMID:12464580

Kamaluddin, M; Zwiazek, Janusz J

2002-12-01

312

Review of the assessment and management of neonatal abstinence syndrome.  

PubMed

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

Bagley, Sarah Mary; Wachman, Elisha M; Holland, Erica; Brogly, Susan B

2014-01-01

313

N-Acetylserotonin: Neuroprotection, Neurogenesis, and the Sleepy Brain  

PubMed Central

N-Acetylserotonin (NAS) is a naturally occurring chemical intermediate in biosynthesis of melatonin. Previous studies have shown that NAS has different brain distribution patterns from those of serotonin and melatonin suggesting that NAS might have functions other than as a precursor or metabolite of melatonin. Indeed several studies have now shown that NAS may play an important role in mood regulation and may have antidepressant activity. Additional studies have shown that NAS stimulates proliferation of neuroprogenitor cells and prevents some of the negative effects of sleep deprivation. It is believed that the antidepressant and neurotrophic actions of NAS are due, at least in part, to the capability on this molecule to activate the TrkB receptor in a BDNF-independent manner. Emerging evidence also indicates that NAS and its derivatives have neuroprotective properties and protect retinal photoreceptor cells from light-induced degeneration. In this review we will discuss the literature about this exciting and underappreciated molecule. PMID:22585341

Tosini, Gianluca; Ye, Keqiang; Iuvone, P. Michael

2012-01-01

314

Validation of a Portuguese form of Templer's Death Anxiety Scale.  

PubMed

To translate Templer's Death Anxiety Scale into the Brazilian Portuguese Escala de Ansiedade de Morte, linguistic validity was first established by back-translation and calculating bilingual split-half reliability coefficients. Even-numbered items achieved a minimally adequate .59, while the odd-numbered items attained a satisfactory .91. The internal consistency of the Escala (.77) matches that found for the original scale. The construct validity was tested by replicating the interactions of the English form with (1) the State-Trait Anxiety Inventory, (2) the Purpose-in-Life Test, and (3) Levenson's measure of locus of control. The Escala performed as expected, save for some difficulty with the locus of control measure. PMID:8367559

Donovan, J M

1993-08-01

315

Neonatal abstinence syndrome.  

PubMed

Neonatal abstinence syndrome (NAS) is a result of the sudden discontinuation of fetal exposure to substances that were used or abused by the mother during pregnancy. Withdrawal from licit or illicit substances is becoming more common among neonates in both developed and developing countries. NAS continues to be an important clinical entity throughout much of the world. NAS leads to a constellation of signs and symptoms involving multiple systems. The pathophysiology of NAS is not completely understood. Urine or meconium confirmation may assist the diagnosis and management of NAS. The Finnegan scoring system is commonly used to assess the severity of NAS; scoring can be helpful for initiating, monitoring, and terminating treatment in neonates. Nonpharmacological care is the initial treatment option, and pharmacological treatment is required if an improvement is not observed after nonpharmacological measures or if the infant develops severe withdrawal. Morphine is the most commonly used drug in the treatment of NAS secondary to opioids. An algorithmic approach to the management of infants with NAS is suggested. Breastfeeding is not contraindicated in NAS, unless the mother is taking street drugs, is involved in polydrug abuse, or is infected with HIV. Future studies are required to assess the long-term effects of NAS on children after prenatal exposure. PMID:25070299

Kocherlakota, Prabhakar

2014-08-01

316

Artificial sweeteners induce glucose intolerance by altering the gut microbiota.  

PubMed

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

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

317

Genetic control of nitrate assimilation in Klebsiella oxytoca. Final technical report  

SciTech Connect

Some microorganisms can use nitrate as the sole source of nitrogen for biosynthesis. This project focused on the bacterium Klebsiella oxytoca, an enterobacterium found in soil and water. Mutagenesis and molecular cloning identified the nasFEDCBA operon encoding enzymes for the uptake and reduction of nitrate and nitrite to ammonium, and the adjacent nasR regulatory gene. Analysis of nasF operon expression revealed that transcription is activated by the Ntr (general nitrogen regulation ) system in response to nitrogen limitation. Transcription antitermination control in response to nitrate and nitrite is mediated by the NasR protein. Additional work established that the NasR protein is an RNA-binding protein that interacts with nasF operon leader RNA to control transcription readthrough.

Stewart, Valley J.

2001-04-01

318

Environmental, health, and safety issues of sodium-sulfur batteries for electric and hybrid vehicles  

Microsoft Academic Search

Recycling and disposal of spent sodium-sulfur (Na\\/S) batteries are important issues that must be addressed as part of the commercialization process of Na\\/S battery-powered electric vehicles. The use of Na\\/S batteries in electric vehicles will result in significant environmental benefits, and the disposal of spent batteries should not detract from those benefits. In the United States, waste disposal is regulated

Corbus

1992-01-01

319

Environmental, health, and safety issues of sodium-sulfur batteries for electric and hybrid vehicles. Volume 2, Battery recycling and disposal  

Microsoft Academic Search

Recycling and disposal of spent sodium-sulfur (Na\\/S) batteries are important issues that must be addressed as part of the commercialization process of Na\\/S battery-powered electric vehicles. The use of Na\\/S batteries in electric vehicles will result in significant environmental benefits, and the disposal of spent batteries should not detract from those benefits. In the United States, waste disposal is regulated

Corbus

1992-01-01

320

Management of neonatal abstinence syndrome in neonates born to opioid maintained women  

Microsoft Academic Search

Neonates born to opioid-maintained mothers are at risk of developing neonatal abstinence syndrome (NAS), which often requires pharmacological treatment. This study examined the effect of opioid maintenance treatment on the incidence and timing of NAS, and compared two different NAS treatments (phenobarbital versus morphine hydrochloride).Fifty-three neonates born to opioid-maintained mothers were included in this study. The mothers received methadone (n=22),

Nina Ebner; Klaudia Rohrmeister; Bernadette Winklbaur; Andjela Baewert; Reinhold Jagsch; Alexandra Peternell; Kenneth Thau; Gabriele Fischer

2007-01-01

321

Nonaudit Services and Earnings Conservatism: Is Auditor Independence Impaired?  

Microsoft Academic Search

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

CAITLIN RUDDOCK; SARAH J. TAYLOR; STEPHEN L. TAYLOR

2006-01-01

322

Measurement of naphthenic acids in the receiving waters around an offshore oil platform by passive sampling.  

PubMed

Polar organic chemical integrative samplers (POCIS) were deployed in the vicinity of an offshore oil installation and analyzed for naphthenic acids (NAs). The POCIS accumulated a range of mono- to tetracyclic NAs, with different degrees of alkylation, with monocyclic acids being the most abundant. Currently, POCIS or similar polar samplers may be the only way to measure exposure to NAs from offshore discharges in situ. In addition, they may be a valuable tool for monitoring similar organic acids in general. PMID:24889815

Harman, Christopher; Langford, Katherine; Sundt, Rolf C; Brooks, Steven

2014-09-01

323

Space science education and training in Brazil  

NASA Astrophysics Data System (ADS)

With the beginning of space research in Brazil in the early 60's a national commission for space activities was created. This commission took important steps, in parallel, to create a program of education and training activities that was forseen as of critical importance for the maintenance of a desirable to ambitious degree of space activity in the country. Early efforts were, as a first step, in favour of training of Brazilian students in foreign centers of excellence (mostly in the US and Europe), as a means for achieving the potential human resource necessary for eventual development of a national program. Today a large percentage of the needs in the area is met by programs developed inside the country at different institutions, the most notable being the ``Instituto Nacional de Pesquisas Espaciais'' - INPE (National Institute for Space Research) at Sa~o Jos dos Campos, where post graduate courses and training programs are well established. Under-graduate courses in selected areas are provided at some Universities, notably at the University of Sa~o Paulo. A brief description of the existing programs and an evaluation of the results being achieved are presented in this paper.

Abdu, M. A.; Batista, I. S.

324

A Study of the Spanish Translation of the Wechsler Intelligence Scale for Children-Revised with Puerto Rican Children and Adolescents.  

ERIC Educational Resources Information Center

Two studies were performed with Puerto Rican children and adolescents in Puerto Rico and Connecticut to determine the reliability and predictive validity of the Spanish translation of the Wechsler Intelligence Scale for Children-Revised, the Escala de Inteligencia Wechsler para Ninos-Revisada (EIWN-R). Results suggest that the EIWN-R is a reliable

Rodriguez, Maria D.; And Others

325

Optimal Short Forms of the Spanish WAIS (EIWA).  

ERIC Educational Resources Information Center

Investigated optimal two-, three-, four-, and five-test short forms of the Escala de Inteligencia Wechsler para Adultos (EIWA), the Spanish form of the Wechsler Adult Intelligence Scale (D. Wechsler, 1956). Results with 616 adults suggest that use of the EIWA should be limited to research and tracking cognitive changes over time. (SLD)

Demsky, Yvonne; Gass, Carlton; Edwards, William T.; Golden, Charles J.

1998-01-01

326

Estudio del NCI revela que la obesidad extrema puede acortar la esperanza de vida hasta en 14 aos  

Cancer.gov

Los adultos con obesidad extrema tienen un mayor riesgo de morir a una edad ms joven debido al cncer y a muchas otras causas entre ellas, enfermedades cardacas, accidentes cerebrovasculares, diabetes y enfermedades del hgado y los riones, segn los resultados de un anlisis de datos de 20 estudios a gran escala realizados en personas de tres pases.

327

Ministerio de Vivienda CIUDAD Y TERRITORIO Estudios Territoriales, XXXIX (154) 2007 689  

E-print Network

, un modo de vida concreto, la de los labradores y ganaderos de Saya- go, verdaderos artífices de este seleccionada sobre un aspecto muy concreto, como son las escalas urbana y arquitectónica, de mi tesis doctoral

Rey Benayas, José María

328

Perspectiva de los lodos descendiendo  

E-print Network

- yecto de ley de responsabilidad civil ambiental por parte del Ministerio de Medio Ambiente. No obstante RESPONSABILIDAD POR DA?OS AL MEDIO AMBIENTE #12;ambienta Marzo 2005 7 L a aprobación de una legislación sobre res Co- misión Europea viene trabajando en el establecimiento de un régimen de responsabilidad a escala

Espigares, Tíscar

329

Memorias del Cuarto Simposio Internacional Sobre Polticas, Planificacin y Economa de los Incendios Forestales: Cambio Climtico e Incendios Forestales  

E-print Network

Cifuentes Medina2 Resumen Los mega incendios forestales son eventos de alto grado de criticidad e impacto accesibilidad al lugar, las complicaciones que se tuvo que resolver, sus consecuencias sobre el turismo y la, impactos económicos, mega incendios, El fuego como agente perturbador a escala regional. En Chile, y todo

Standiford, Richard B.

330

Un modelo descriptivo del sistema reproductor hembra del coipo (Myocastor coypus) I: el ovario (A descriptive model of the female reproductive system of coypu (Myocastor coypus) I: the  

Microsoft Academic Search

El coipo (Myocastor coypus) es un roedor de amplia utilizacin como especie peletera a escala mundial. Los ambientes naturales ocupados por el coipo son los acutico-continentales, si bien la especie ha demostrado gran adaptabilidad a diferentes ambientes y regiones geogrficas. A partir de su liberacin accidental de granjas de cra, se localizan poblaciones naturalizadas en Inglaterra, EEUU, pases del Este

R. Argentina

331

Derechos humanos, universalismo, universalidad y particularismos culturales  

Microsoft Academic Search

La mundializacin factual como consecuencia de la revolucin de las tcnicas de comunicacin. Congruencia directa entre el sujeto humano individual y la humanidad global (los medias: instantaneidad mundial de la informacin perceptible por cada individuo miembro de la humanidad; internet: de individuo a individuo directamente a escala mundial). La globalizacin como respuesta a una percepcin planetaria de las amenazas contra

Jean-Luc Chabot

2012-01-01

332

Movilidad ocupacional de los inmigrantes en una economa de bajas cualificaciones. El caso de Espaa  

Microsoft Academic Search

Esta investigacin analiza la movilidad ocupacional de los inmigrantes entre sus pases de origen y Espaa, as como sus principales determinantes. La misma se basa en los microdatos de la Encuesta Nacional de Inmigrantes y el uso de una escala de estatus ocupacional de carcter internacional (ISEI). La evidencia muestra que, por lo general, los inmigrantes sufren una fuerte degradacin

Hiplito Simn; Raul Ramos; Esteban Sanrom

2010-01-01

333

MEDICIN DE LA TASA DE INFLACIN EN LA PROVINCIA DE SANTIAGO DE CUBA, PERIODO 2004-2010  

Microsoft Academic Search

El presente trabajo mide la tasa de inflacin en la provincia de Santiago de Cuba en el perodo 2004-2010, a travs del clculo del ndice de Precios al Consumidor calculado a travs del ndice de Precios de Laspeyres. La Investigacin se justifica porque en la actualidad a escala internacional se manifiesta con bastante regularidad un incremento acelerado en el nivel

Rosala Martnez Manrique; Carlos Manuel Hernndez Oro

2012-01-01

334

Desafios da integrao de fontes renovveis nos  

E-print Network

necessidade de deslocamentos Aproveitamento de energia solar , eólica e biomassa Setor de transporte Mudanças+ Desafios da integração de fontes renováveis nos sistemas de energia convencionais Gilberto De escala? Sistemas convencionais de energia Carvão, petróleo e gás natural Nuclear Hidroeletricidade

Ferreira, Márcia M. C.

335

ESPAC O TEMPO DE ROBERTSON-WALKER SINU^E DAYAN BARBERO LODOVICI  

E-print Network

apenas o sistema solar, escala onde a teoria Newtoniana se encontrava restrita. Evid^encias astron densidade de energia e por sua press~ao isotr´opica p. Evid^encias sugerem ser o espa¸co de nosso universo

Piccione, Paolo

336

Esto os Portugueses a ?votar com os ps?? Alguma evidncia emprica  

Microsoft Academic Search

Como sabido, os movimentos migratrios escala regional so fruto de uma diversidade de factores. Sendo entendidos como uma reaco, por parte da populao, a desvantagens (inaceitveis) de natureza econmica apresentadas pela regio de origem, estes movimentos demogrficos constituem um importante exemplo da chamada ?votao com os ps?. Claramente, a inexistncia (ou a mera ineficcia) de polticas regionais que

Antnio Caleiro

2005-01-01

337

Propiedades psicomtricas de la versin espaola del Inventario de Ansiedad Competitiva CSAI-2R en deportistas  

Microsoft Academic Search

El objetivo del presente trabajo consisti en obtener una versin adaptada al espaol del inventario de ansiedad competitiva CSAI-2, revisado recientemente. Se llev a cabo la traduccin de la escala y se estudiaron sus propiedades psicomtricas con una muestra de 149 deportistas. Los datos se sometieron a procedimientos de anlisis factorial exploratorio y confirmatorio. Como resultado se obtuvo una for-

Elena M. Andrade Fernndez; Graciela Lois Ro; Constantino Arce Fernndez

338

Relative abundance of amphibians in forest canopy gaps of natural origin vs. timber harvest origin  

Microsoft Academic Search

Los claros a pequea escala producidos en el dosel forestal por la industria maderera pueden conservar una estructura del hbitat apropiada para mantener la abundancia de anfibios. Utilizamos trampas con vallas de intercepcin para medir la abundancia relativa de anfibios en 44 claros en que la madera haba sido cortada, 19 claros naturales producidos por la cada de los rboles,

C. Stronjny; M. L. Hunter

2010-01-01

339

Workshop: Mtodos Avanados de Sensoriamento Remoto para Aplicaes em Solos (Advanced Remote Sensing Methods for Soil Applications)  

E-print Network

para o mapeamento global de solos em escala continental e dados de radar (Ground Penetrating Radar, and local to regional radar applications based on Ground Penetrating Radar data. Examples will be presented techniques applied at all scales from ground-based instruments to remote sensing scale for soil geochemical

340

Caracterizacin y seleccin del lugar de nidificacin de la grulla cubana (Grus canadensis nesiotes) en los herbazales del Refugio de Fauna El Venero, Cuba  

Microsoft Academic Search

Grus canadensis nesiotes es una subespecie endmica y amenazada de grulla cuyas poblaciones estn asociadas a humedales de agua dulce. En este trabajo se caracteriz su lugar de nidificacin y se determin su seleccin a tres escalas espaciales en los herbazales del Refugio de Fauna El Venero, Cuba, durante los aos 20052007. Se monitorizaron 26 nidos hasta la eclosin. Tambin

Y. Ferrer Snchez; D. Denis vila; I. Ruiz Companioni

2010-01-01

341

Customer-Company Identification: A Study of Relational Consequences in the Non-Profit Sector  

E-print Network

' identification with brands (Huffman, Ratneshwar & Mick, 2000; Escalas, 2004), or on members' identification movements or universities, the specific case we are looking at in this research. The concept of branding has; Turner, 1984) identity is composed of both a personal identity, which consists of idiosyncratic

Paris-Sud XI, Université de

342

Caracterizacin de tintas de titanio dopadas con xidos metlicos  

Microsoft Academic Search

Se prepararon tintas de Diisopropoxido de titanio bis(acetilacetonato) por el mtodo sol-gel para aplicar en la elaboracin de nanoestructuras mediante la tcnica de escritura directa. Esta tcnica permite estructurar materiales con alto ndice de refraccin a escala micro y nanomtrica en tres dimensiones mediante extrusin, para elaborar cristales fotnicos. El tratamiento de las nanoestructuras extruidas a temperaturas elevadas para transformarlas

C. R. TUBO; F. GUITIN; A. GIL

343

aquagym fitness salsa handball tennis de table rugby rock n'roll  

E-print Network

natation randonnées ski escala judo musculation ultimate gi- gong pilates step tennis capoeïra fesses abdos ultimate gi- gong pilates step tennis capoeïra fesses abdos cuisses yoga kung fu basket-ball futsal judo

Jeanjean, Louis

344

2011:InstitutodeAstronoma,UNAM-XIIILatinAmericanRegionalIAUMeeting Ed.W.J.Henney&S.Torres-Peimbert  

E-print Network

´amicas con el fin de estudiar la distribuci´on de masa en SL2S J02140-0535. Este grupo de galaxias a z = 0´on de lentes a escala de grupos de galaxias. Nuestro an´alisis de lente fuerte est´a basado en im

Paris-Sud XI, Université de

345

To appear in \\Galaxy Evolution: Theory and Observations (2002)" RevMexAA(SC) DEEP: NEW SURVEYS OF DISTANT FIELD GALAXIES  

E-print Network

dos fases (DEEP1, DEEP2) con el objectivo de caracterizar las propiedades de galaxias lejanas del la cinem#19;atica interna de galaxias, y imagenes HST. Con el DEEP, aspiramos caracterizar la formac#19;#16;on y evoluc#19;#16;on de galaxias, mapear las estructuras de larga escala lejanas, y imponer

346

Liderana, Coeso e Satisfao em Equipas Desportivas: Um Estudo com Atletas Portugueses de Futebol e Futsal Leadership, Cohesion and Satisfaction in Sporting Teams: A Study with Portuguese Football and Futsal Athletes  

Microsoft Academic Search

Resumo Este trabalho foi realizado com 200 atletas de duas modalidades (futebol e futsal) includos em vrios escales desportivos e analisa a liderana dos treinadores e a coeso e satisfao dos praticantes. Para tal, utilizmos um protocolo de avaliao, com instrumentos de avaliao da liderana (Escala Multidimensional de Liderana, que avalia seis dimenses), da coeso (Questionrio de Coeso em Equipas

A. Rui Gomes; Ana Patricia Pereira; Ana Raquel Pinheiro

347

EL MANEJO DE LAS PESQUERAS EN ROS TROPICALES DE SUDAMRICA  

E-print Network

flota artesanal que abastece los mercados urbanos, generando un ingreso sectorial de casi 400 millones pequeñaa escala como sobre la pesca de la flota comercial artesanal, la actividad ha sido estudiada, evaluar la pesca de la flota comercial de Santarém a través de un análisis multiagentes, y evaluar la

Lorenzen, Kai

348

Integration of traditional ecological knowledge and ecology of populations for turtle conservation (testudines: podocnemididae) in floodplain of Amazon.  

E-print Network

??Quelnios so recursos historicamente explorados por populaes humanas nos ecossistemas aquticos amaznicos. Naturalistas relatam que indgenas mantinham grande quantidade de animais em currais nas aldeias (more)

Jackson Pantoja Lima

2012-01-01

349

Allied health services: avoiding crisis. Institute of Medicine, National Academy of Sciences.  

PubMed

The National Academy of Science/Institute of Medicine (NAS/IOM) recently completed an eighteen-month, congressionally mandated study of the role of allied health personnel in the nation's health care system. In this landmark study, NAS/IOM signals the growing importance of the allied health professions. Underscoring that the allied health professions have come of age, the report represents the first study of allied health by a major branch of the NAS. Thus, the study in itself is a major event, one which sets precedent. The Executive Summary of the report is reprinted for readers of JAH by permission of NAS/IOM. PMID:2504689

1989-01-01

350

Estimating naphthenic acids concentrations in laboratory-exposed fish and in fish from the wild.  

PubMed

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

Young, Rozlyn F; Wismer, Wendy V; Fedorak, Phillip M

2008-09-01

351

Genotoxic potential of several naphthenic acids and a synthetic oil sands process-affected water in rainbow trout (Oncorhynchus mykiss).  

PubMed

The exploitation of oil sands has raised major environmental concerns, particularly regarding the presence of high concentration in contaminants such as polycyclic aromatic hydrocarbons (PAHs) and naphthenic acids (NAs) in oil sands process-affected water (OSPW). The purpose of this study was, first to evaluate the genotoxic impact of OSPW-related compounds such as NAs and PAHs in a salmonid species and secondly to assess if OSPW exposure leads to genotoxicity. For this purpose, rainbow trout hepatocytes were exposed in vitro to environmentally relevant concentrations of synthetic NAs, naphtalene, benzo(a)pyrene, and extracts of synthetic OSPW (generated by a laboratory bitumen extraction) and of oil sands leaching water (OSLW, mimicking leaching of oil sands in river water). Primary DNA damage was assessed by the formamidopyrimidine-DNA glycolyase (Fpg)-modified comet assay. Genotoxicity was observed in hepatocytes exposed to several NAs, mixture of them, OSPW and OSLW extracts. The chemical structure of NAs influences the genotoxicity potential: among the NAs tested, the most cyclic NA was the most genotoxic. It also appears that genotoxicity was more marked for OSPW than for OSLW. Because exposure to OSPW led to oxidative DNA damage, while after exposure to several NAs, these types of DNA damage were limited, the NAs tested in this study could not be qualified as the only major contaminants responsible for OSPW genotoxicity. Notwithstanding, it should be noteworthy that exposure to NAs resulted in genotoxic impact at concentrations lower than those documented by literature for fresh OSPW. Further research is needed to explore the relationships between the chemical structure of NAs and their genotoxicity in the light of the distribution of NAs in fresh OSPW samples as well as in surface waters. PMID:24799193

Lacaze, E; Devaux, A; Bruneau, A; Bony, S; Sherry, J; Gagn, F

2014-07-01

352

Differences in phytotoxicity and dissipation between ionized and nonionized oil sands naphthenic acids in wetland plants.  

PubMed

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

Armstrong, Sarah A; Headley, John V; Peru, Kerry M; Germida, James J

2009-10-01

353

Wake turbulence avoidance automation: Evaluation of feasibility and impact  

Microsoft Academic Search

Wake turbulence encounters are a significant concern to pilots flying in the National Airspace System (NAS). The MITRE Corporation's Center for Advanced Aviation System Development (CAASD) has worked with the Federal Aviation Administration (FAA) to increase efficiency and capacity in the NAS that will come with the FAA's Next Generation Air Transportation System (NextGen). By increasing efficiency and capacity, there

Steven L. Estes; Marshall E. Koch; Clark R. Lunsford; Andrew S. Mendolia

2011-01-01

354

Infant autonomic functioning and neonatal abstinence syndrome  

PubMed Central

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

Jansson, Lauren M.; DiPietro, Janet A.; Elko, Andrea; Velez, Martha

2010-01-01

355

An Analysis of the Effects of Net-Centric Operations Using Multi-Agent Adaptive Behavior  

ERIC Educational Resources Information Center

The National Airspace System (NAS) is a resource managed in the public good. Equity in NAS access, and use for private, commercial and government purposes is coordinated by regulations and made possible by procedures, and technology. Researchers have documented scenarios in which the introduction of new concepts-of-operations and technologies has

Calderon-Meza, Guillermo

2011-01-01

356

Effects of exposure to naphthenic acids in tree swallows (Tachycineta bicolor) on the Athabasca oil sands, Alberta, Canada.  

PubMed

Naphthenic acids (NAs) are a group of carboxylic acids that are of particular concern to the steadily growing oil sands mining industry of Alberta, Canada, because they become highly concentrated in the water used for oil sands extraction and are toxic to aquatic biota and mammals. Upon mine closure, vast amounts of process-affected water will need to be reclaimed and proven safe for wildlife colonizing reclaimed areas. The effects of exposure to NAs have not been investigated in avian species. To address this void, tree swallow (Tachycineta bicolor) nestlings were dosed with NAs while being reared normally by their free-ranging parents on a site in the vicinity of the oil sands. Nestlings received 1.5 mg NAs/day (approximately 0.075 g/kg body mass) from d 7 to d 13 of age, which represented a 10-fold "worst exposure" scenario. Nestling growth, hematocrit, blood biochemistry, organ weights, and ethoxyresorufin O-deethylase (EROD) activity were unaffected by NAs. The only change detected on histopathological evaluation of major organs was an increase in extramedullary erythropoiesis in the liver. These findings indicate that nestling tree swallows can successfully tolerate short-term exposures to environmentally realistic concentrations of NAs. However, this study did not investigate the chronic or reproductive toxicity of NAs. More research needs to be conducted to complete this initial assessment, to determine environmental risks on reclaimed areas where birds will be breeding and where their exposure to NAs could extend for several weeks. PMID:17573632

Gentes, Marie-Line; Waldner, Cheryl; Papp, Zsuzsanna; Smits, Judit E G

2007-07-01

357

Relationship between Weather, Traffic and Delay Based on Empirical Methods  

NASA Technical Reports Server (NTRS)

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.

Sridhar, Banavar; Swei, Sean S. M.

2006-01-01

358

Shifts in Root-Associated Microbial Communities of Typha Latifolia Growing in Naphthenic Acids and Relationship to Plant Health  

Microsoft Academic Search

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,

Lori A. Phillips; Sarah A. Armstrong; John V. Headley; Charles W. Greer; James J. Germida

2010-01-01

359

Current Management of the Neonatal Abstinence Syndrome: A Critical Analysis of the Evidence  

Microsoft Academic Search

Objective: To systematically and critically analyse and summarise the published evidence for the rational choice of pharmacologic treatment of the neonatal abstinence syndrome (NAS), a frequently observed condition in neonates born to mothers who are dependent on physically addicting drugs. Design: Studies comparing different pharmacological agents for the treatment of NAS were identified utilising MEDLINE and additionally the references cited

Jochen G. W. Theis; Peter Selby; Yazemir Ikizler; Gideon Koren

1997-01-01

360

Neonatal abstinence syndrome in methadone-exposed infants is altered by level of prenatal tobacco exposure  

Microsoft Academic Search

Maternal tobacco consumption during pregnancy has been associated with lower birth weight infants, preterm births, intrauterine growth retardation, smaller head circumference and increase in morbidity, yet few studies have examined the role tobacco has on the opiate neonatal abstinence syndrome (NAS). This study examined the effect of prenatal tobacco exposure on NAS for infants born to mothers maintained on methadone

Robin E Choo; Marilyn A Huestis; Jennifer R Schroeder; Angela S Shin; Hendre E Jones

2004-01-01

361

Infant autonomic functioning and neonatal abstinence syndrome  

Microsoft Academic Search

BackgroundNeonatal 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,

Lauren M. Jansson; Janet A. DiPietro; Andrea Elko; Martha Velez

2010-01-01

362

Treatment of neonatal abstinence syndrome  

Microsoft Academic Search

Neonatal abstinence syndrome (NAS) is suffered by infants withdrawing from substances on which they have become physically dependent after in utero exposure. They may require prolonged treatment and spend weeks or even months in hospital. A wide range of drugs have been used to treat NAS. The efficacy of few, however, have been adequately investigated. Evidence suggests that opioids are

K Johnson; C Gerada; A Greenough

2003-01-01

363

A randomised controlled trial of morphine versus phenobarbitone for neonatal abstinence syndrome  

Microsoft Academic Search

Background: The incidence of neonatal abstinence syndrome (NAS) has increased 10-fold over the last decade in Glasgow. In the Princess Royal Maternity Hospital, it now accounts for 17% of special care baby unit (SCBU) admissions. Objective: To compare opiate replacement therapy (morphine sulphate) with the present standard treatment (phenobarbitone) for management of NAS. The primary study end point was duration

L Jackson; A Ting; S Mckay; P Galea; C Skeoch

2005-01-01

364

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)

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.

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

2014-01-01

365

Weapons-grade plutonium dispositioning. Volume 2: Comparison of plutonium disposition options  

Microsoft Academic Search

The Secretary of Energy requested the National Academy of Sciences (NAS) Committee on International Security and Arms Control to evaluate disposition options for weapons-grade plutonium. The Idaho National Engineering Laboratory (INEL) offered to assist the NAS in this evaluation by investigating the technical aspects of the disposition options and their capability for achieving plutonium annihilation levels greater than 90%. This

D. A. Brownson; D. J. Hanson; H. S. Blackman

1993-01-01

366

75 FR 8485 - Revocation of Class D and E Airspace; Brunswick, ME  

Federal Register 2010, 2011, 2012, 2013

...of Class D and E Airspace; Brunswick, ME AGENCY: Federal Aviation Administration...Airspace at Brunswick NAS Airport, Brunswick, ME, as the airport has closed and the associated...The Brunswick NAS Airport in Brunswick, ME has closed in compliance with the 2005...

2010-02-25

367

78 FR 69653 - Cancellation of the Notice of Intent To Prepare an Environmental Impact Statement for...  

Federal Register 2010, 2011, 2012, 2013

...stationed at and transient to Naval Air Station (NAS) Oceana and Naval...FCLP) training for all fixed-wing, carrier-based air wing aircraft operating from NAS Oceana...Office, Commander, U.S. Fleet Forces Command, 1562 Mitcher...

2013-11-20

368

A probabilistic airport capacity model for improved ground delay program planning  

Microsoft Academic Search

Weather uncertainty is a major cause of unnecessary delays within the National Airspace System (NAS). In particular, the high uncertainty in terminal area weather forecasts combined with the uncertain correlation between weather and airport capacity makes the task of planning strategic traffic management initiatives such as ground delay programs (GDPs) very difficult. At the twelve airports in the NAS with

Christopher A Provan; Lara Cook; Jon Cunningham

2011-01-01

369

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...

370

L-Band Commercial Communications Service for Unmanned Aircraft Systems  

Microsoft Academic Search

Significant effort is being expended defining the requirements for unmanned aircraft to fly in the National Airspace System (NAS). The goal is for an unmanned aircraft to be able to file a flight plan and fly in the NAS with no more restrictions than those imposed on a manned aircraft. The result would be unmanned and manned aircraft flying together

T. P. Mulkerin

2007-01-01

371

Opioid neonatal abstinence syndrome: controversies and implications for practice.  

PubMed

The Opioid Neonatal Abstinence Syndrome (NAS) is a term used to describe a cluster of signs and symptoms seen in infants experiencing withdrawal from opioid drugs. Despite a substantial literature the relationship between maternal methadone dose, NAS and the method of assessment of NAS symptoms has not been agreed. The following review will address current and historical controversies surrounding these issues and will examine the evidence concerned with the evaluation of neonates exposed to methadone in utero. The key findings are as follows: A variety of NAS scales are used to assess the severity of neonatal withdrawal symptoms including locally adapted validated tools. Inconsistencies in the use of NAS scales have included the timing, duration and frequency of administration; the degree to which observers were trained to reliability; the use of NAS scales designed for term neonates to assess pre-term neonates who may have a qualitatively different expression of abstinence symptoms and; the research setting in which the tool was administered. There is a lack of research investigating the observant bias' effect upon scoring NAS, the basis for treatment decisions and the influence of concomitant maternal use of non-opioid drugs late in pregnancy. We also discuss the implications of the lack of recognition of NAS symptoms leading to possible under reporting and inappropriate, early neonatal discharge from hospital. In addition, this paper also discusses the merits and problems of conducting research in this area and highlights gaps in our knowledge and areas for further research. PMID:25323126

Wolff, Kim; Perez-Montejano, Raul

2014-01-01

372

The Military and Air Traffic Control  

Microsoft Academic Search

The Department of Defense currently operates about 30 000 aircraft, the largest most varied single fleet of aircraft of those using the National Aviation System (NAS). For this and other important reasons discussed herein, military participation in evolving an efficient and effective NAS forces consideration of a number of important issues by the developers and operators of any future Air

D. McColl

1973-01-01

373

GUIDANCE ON IDENTIFYING THE APPROPRIATE AGE GROUPS FOR ASSESSING CHILDHOOD EXPOSURE AND RISK  

EPA Science Inventory

The 1993 National Academy of Sciences (NAS) report "Pesticides in the Diets of Infants and Children" highlights important differences between children and adults with respect to risks posed by pesticides. Some of the principles in the NAS report provided the foundation for the Fo...

374

1EV GaN[subscript x]As[subscript 1-x-y]Sb[subscript y] material for lattice-matched III-V solar cell implementation on GaAs and Ge  

E-print Network

The effect of different arsenic species (As[subscript 2] or As[subscript 4]) on the quality of molecular beam epitaxy (MBE) grown GaNAsSb materials (samples A and B) and GaAs/ GaNAsSb/GaAs p+n-n+ devices (samples C and D) ...

Yoon, Soon Fatt

375

Toxicity assessment of collected fractions from an extracted naphthenic acid mixture  

Microsoft Academic Search

Recent expansion within the oil sands industry of the Athabasca Basin of Alberta, Canada has led to increased concern regarding process-affected wastewaters produced during bitumen extraction. Naphthenic acids (NAs) have been identified as the primary toxic constituents of oil sands process-affected waters (OSPW) and studies have shown that with time, microbial degradation of lower molecular weight NAs has led to

Richard A. Frank; Richard Kavanagh; B. Kent Burnison; Gilles Arsenault; John V. Headley; Kerry M. Peru; Glen Van Der Kraak; Keith R. Solomon

2008-01-01

376

LIFE Economics and Delivery Pathway Presentation to  

E-print Network

LIFE Economics and Delivery Pathway Presentation to National Research Council's review gain may outweigh benefits LIFE Point Design Anklam--NAS/NAE, January 29, 2011NIF-0111-20828s2.ppt 3--NAS/NAE, January 29, 2011NIF-0111-20828s2.ppt 5 #12;At the top level, LIFE plant can be grouped into 8 functional

377

Bold Plans for School Restructuring: The New American Schools Designs.  

ERIC Educational Resources Information Center

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

Stringfield, Sam, Ed.; Ross, Steven, M., Ed.; Smith, Lana, Ed.

378

Assimilation, and the Definite Nominal Particle in Balti Tibetan  

E-print Network

,. and palatalization and retroflexion abbreviated as follows: lab., uvul., vel., dent. alveoI., pal., pal., voicelsns . QCC.,nas., fric., lat., palzn., retro.): i. lab. +voicelsns. +occ. (ppo] ii. + (vO'ice)6 +nas. (mpo] iii. uvu!. + voicelsns. +occ. [qpo] iv...

Sprigg, R. K.

1972-07-14

379

Nerve Agent Attacks on Children: Diagnosis and Management  

Microsoft Academic Search

Nerve agents (NAs) are the most lethal chemical weapons. We review the pathophysiology and management of NA poisoning of children. NAs cause cholinergic crisis. Children may manifest signs of cho- linergic poisoning differently than adults. Children may be less likely to manifest miosis and glandular secre- tions. They may present with neurologic derangements alone. The goals of treatment should be

Joshua S. Rotenberg; Jonathan Newmark

380

The Benefit of Alternative Position, Navigation, and Timing (APNT) to Aviation and Other User Communities for  

E-print Network

/go to source of P and N and T is a Global Navigation Satellites System (GNSS). While the transition of various-DME alternative is currently used by aircraft in the NAS to fly area navigation (RNAV) routes in the NAS per FAAThe Benefit of Alternative Position, Navigation, and Timing (APNT) to Aviation and Other User

Stanford University

381

Neonatal Animal Models of Opiate Withdrawal  

Microsoft Academic Search

The symptoms of opiate withdrawal in infants are defined as neonatal abstinence syndrome (NAS). NAS is a significant cause of morbidity in term and preterm infants. Factors, such as polysubstance abuse, inadequate prenatal care, nu- tritional deprivation, and the biology of the developing cen- tral nervous system contribute to the challenge of evaluating and treating opiate-induced alterations in the newborn.

Kimberlei A. Richardson; Anne-Lise J. Yohay; Estelle B. Gauda; Gabrielle L. McLemore

2006-01-01

382

Odor detection thresholds of naphthenic acids from commercial sources and oil sands process-affected water.  

PubMed

Naphthenic acids (NAs) occur naturally in various petroleums and in oil sands tailings waters and have been implicated as potential fish tainting compounds. In this study, trained sensory panels and the general population from a university were used to determine the odor detection thresholds of two commercial NAs preparations (Acros and Merichem) and of NAs extracted from an oil sands experimental reclamation pond (Pond 9). Using the three-alternative forced choice method, a concentration series of NAs were presented to the sensory panels in phosphate buffer (pH 8) and in steamed fish (Sander vitreus). In buffer, the odor detection thresholds of Acros, Merichem and Pond 9 NAs, as evaluated by the trained panelists, were 1.5, 0.04, and 1.0 mg L(-1), respectively. Only the detection threshold for the Merichem NAs was significantly different (p<0.01) than the other two sources. Based on the general population assessments, all three odor detection thresholds were significantly different from one another; 4.8, 0.2, and 2.5 mg L(-1) for Acros, Merichem, and Pond 9 NAs, respectively (p<0.01). The odor detection thresholds of Merichem and Pond 9 NAs in steamed fish were 0.6 and 12 mg kg(-1), respectively and were significantly different from each other (p<0.01). The detection threshold of Acros NAs was estimated to be >21 mg kg(-1). For the steamed fish evaluations, the odor descriptors of all three of the NAs preparations was given as chemical in nature (Acros: oil, plastic; Merichem: gasoline; Pond 9: gasoline, tar). Exposure of live rainbow trout to a non-lethal concentration of Merichem NAs (3 mg L(-1) for 10 d) imparted an odor to the fish flesh. Analyses of the three NAs preparations by gas chromatography-mass spectrometry showed that each had a unique distribution of acids. We conclude that the source of the NAs is important when interpreting odor threshold data and that the two commercial preparations of NAs that were tested do not represent oil sands waters' tainting potential. PMID:20801486

Edge, Kristyn; Barona, Brenda; Young, Rozlyn F; Fedorak, Phillip M; Wismer, Wendy V

2010-11-01

383

Diversity and abundance of nitrate assimilation genes in the northern South china sea.  

PubMed

Marine heterotrophic microorganisms that assimilate nitrate play an important role in nitrogen and carbon cycling in the water column. The nasA gene, encoding the nitrate assimilation enzyme, was selected as a functional marker to examine the nitrate assimilation community in the South China Sea (SCS). PCR amplification, restriction fragment length polymorphism (RFLP) screening, and phylogenetic analysis of nasA gene sequences were performed to characterize in situ nitrate assimilatory bacteria. Furthermore, the effects of nutrients and other environmental factors on the genetic heterogeneity of nasA fragments from the SCS were evaluated at the surface in three stations, and at two other depths in one of these stations. The diversity indices and rarefaction curves indicated that the nasA gene was more diverse in offshore waters than in the Pearl River estuary. The phylotype rank abundance curve showed an abundant and unique RFLP pattern in all five libraries, indicating that a high diversity but low abundance of nasA existed in the study areas. Phylogenetic analysis of environmental nasA gene sequences further revealed that the nasA gene fragments came from several common aquatic microbial groups, including the Proteobacteria, Cytophaga-Flavobacteria (CF), and Cyanobacteria. In addition to the direct PCR/sequence analysis of environmental samples, we also cultured a number of nitrate assimilatory bacteria isolated from the field. Comparison of nasA genes from these isolates and from the field samples indicated the existence of horizontal nasA gene transfer. Application of real-time quantitative PCR to these nasA genes revealed a great variation in their abundance at different investigation sites and water depths. PMID:18481138

Cai, Haiyuan; Jiao, Nianzhi

2008-11-01

384

Naphthenic acids in coastal sediments after the hebei spirit oil spill: a potential indicator for oil contamination.  

PubMed

Naphthenic acids (NAs) as toxic components in most petroleum sources are suspected to be one of the major pollutants in the aquatic environment following oil spills, and the polarity and persistence of NAs make it a potential indicator for oil contamination. However, the contamination and potential effects of pollutants in oil spill affected areas remain unknown. To investigate NAs in oil spill affected areas, a sensitive method was first established for analysis of NAs, together with oxy-NAs in sediment samples by UPLC-QTOF-MS. Then the method was applied to determine the NA mixtures in crude oil, weathered oil, and sediments from the spilled sites after the Hebei Spirit oil spill, Taean, South Korea (Dec. 2007). Concentrations of NAs, O3-NAs, and O4-NAs were found to be 7.8-130, 3.6-44, and 0.8-20 mg kg(-1) dw in sediments from the Taean area, respectively, which were much greater than those measured in the reference sites of Manlipo and Anmyundo beaches. Concentrations of NAs were 50-100 times greater than those (0.077-2.5 mg kg(-1) dw) of PAHs in the same sediment samples, thus the ecological risk of NAs in oil spill affected areas deserves more attention. The sedimentary profiles of oil-derived NAs and background NAs centered around compounds with 21-35 and 12-21 carbons, respectively, indicating that the crude-derived NA mixtures originating from the 2007 oil spill were persistent. Acyclic NAsn=5-20 were easily degraded compared to cyclic NAsn=21-41 during the oil weathering processes, and the ratio of oxy-NAsn=21-41 relative to NAsn=21-41 could be a novel index to estimate the degree of oil weathering in sediments. Altogether, the persistent oil-derived NAsn=21-41 could be used as a potential indicator for oil-specific contamination, as such compounds would not be much affected by the properties of coastal sediments possibly due to the high sorption of the negatively charged compounds (NAs) in sediment. PMID:24579908

Wan, Yi; Wang, Beili; Khim, Jong Seong; Hong, Seongjin; Shim, Won Joon; Hu, Jianying

2014-04-01

385

Enhanced accumulation of secreted human growth hormone by transgenic tobacco cells correlates with the introduction of an N-glycosylation site.  

PubMed

Extracellular secretion of recombinant proteins from plant cell suspension culture will simplify the protein purification procedure and greatly reduce the production cost. Our early work indicated that presence of hydroxyproline-O-glycosylation at the C- or N-terminus of the target protein boosted the secreted yields in the culture medium. Inspired by early successes, we tested the possibility of introducing an N-glycosylation site to facilitate the secretion of human growth hormone (hGH) from cultured tobacco cells. Three N-glycosylated hGH fusion proteins, designated NAS-EK-hGH, NAS-Kex2-hGH and hGH-NAS, were expressed in tobacco BY-2 cells. Where NAS denotes the "Asn-Ala-Ser" consensus sequence for N-glycosylation; EK denotes an enterokinase cleavage site and Kex2 a sequence to be cleaved by a Golgi-localized Kex2p-like protease. Our results indicated that a single N-glycan attached either at the N-terminus or C-terminus of hGH correlated with enhanced extracellular accumulation of the transgenic proteins; the secreted yield of NAS-EK-hGH and hGH-NAS was 70-90 fold greater than the control targeted, non-glycosylated hGH. NAS-Kex2-hGH was subject to partial cleavage of the N-glycan tag at the Kex2 site in Golgi apparatus, and therefore gave lower yields than the other two constructs. PMID:21507336

Xu, Jianfeng; Kieliszewski, Marcia

2011-06-10

386

Amelioration of binge eating by nucleus accumbens shell deep brain stimulation in mice involves D2 receptor modulation  

PubMed Central

Hedonic over-consumption contributing to obesity involves altered activation within the mesolimbic dopamine system. Dysregulation of dopamine signaling in the nucleus accumbens shell (NAS) has been implicated in reward-seeking behaviors, such as binge eating, which contributes to treatment resistance in obesity (Wise, 2012). Direct modulation of the NAS with deep brain stimulation (DBS), a surgical procedure currently under investigation in humans for the treatment of major depression, obsessive-compulsive disorder, and addiction, may also be effective in ameliorating binge eating. Therefore, we examined the ability of DBS of the NAS to block this behavior in mice. c-Fos immunoreactivity was assessed as a marker of DBS-mediated neuronal activation. NAS DBS was found to reduce binge eating, and increased c-Fos levels in this region. DBS of the dorsal striatum had no influence on this behavior, demonstrating anatomical specificity for this effect. The dopamine D2 receptor antagonist, raclopride, attenuated the action of DBS, while the D1 receptor antagonist, SCH-23390, was ineffective, suggesting that dopamine signaling involving D2 receptors underlies the effect of NAS DBS. To determine the potential translational relevance to the obese state, chronic NAS DBS was also examined in diet-induced obese mice, and was found to acutely reduce caloric intake and induce weight loss. Taken together, these findings support the involvement of the mesolimbic dopamine pathways in the hedonic mechanisms contributing to obesity, and the efficacy of NAS DBS to modulate this system. PMID:23616522

Halpern, Casey H.; Tekriwal, Anand; Santollo, Jessica; Keating, Jeffrey G.; Wolf, John A.; Daniels, Derek; Bale, Tracy L.

2013-01-01

387

N-acetylserotonin: neuroprotection, neurogenesis, and the sleepy brain.  

PubMed

N-Acetylserotonin (NAS) is a naturally occurring chemical intermediate in biosynthesis of melatonin. Previous studies have shown that NAS has different brain distribution patterns from those of serotonin and melatonin, suggesting that NAS might have functions other than as a precursor or metabolite of melatonin. Indeed, several studies have now shown that NAS may play an important role in mood regulation and may have antidepressant activity. Additional studies have shown that NAS stimulates proliferation of neuroprogenitor cells and prevents some of the negative effects of sleep deprivation. It is believed that the antidepressant and neurotrophic actions of NAS are due at least in part to the capability on this molecule to activate the TrkB receptor in a brain-derived neurotrophic factor-independent manner. Emerging evidence also indicates that NAS and its derivatives have neuroprotective properties and protect retinal photoreceptor cells from light-induced degeneration. In this review, the authors discuss the literature about this exciting and underappreciated molecule. PMID:22585341

Tosini, Gianluca; Ye, Keqiang; Iuvone, P Michael

2012-12-01

388

Microwave treatment of naphthenic acids in water.  

PubMed

Naphthenic acids (NAs) are natural constituents of bitumen and crude oil. These compounds are concentrated as part of the oil sands process water (OSPW) during petroleum refining and separation from oil sands. NAs are considered among the major water contaminants in OSPW due to their toxicity and environmental recalcitrance. A laboratory scale microwave system was developed and experiments were conducted to determine the efficiency of NA degradation during microwave treatment. The effects of water source and quality (deionized lab water and river water) and of TiO(2) catalyst in the degradation process were also investigated. Degradation kinetic parameters for both total NAs and individual z-family were calculated. The microwave system degraded OSPW NAs and commercial Fluka NAs in river water in the presence of TiO(2) rapidly, producing half-life values of 3.32 and 3.61 hours, respectively. Toxicity assessments of the NA samples pre-and post-treatment indicated that the microwave system reduced overall toxicity of water containing Fluka NAs from high (5 min. IC(50) v/v = 15.85%) to moderate (5 min. IC(50) v/v = 36.45%) toxicity levels. However, a slight increase in toxicity was noted post-treatment in OSPW NAs. PMID:20623403

Mishra, Sabyasachi; Meda, Venkatesh; Dalai, Ajay K; Headley, John V; Peru, Kerry M; McMartin, Dena W

2010-08-01

389

Making Each Other's Daily Life: Nurse Assistants' Experiences and Knowledge on Developing a Meaningful Daily Life in Nursing Homes  

PubMed Central

Background: In a larger action research project, guidelines were generated for how a meaningful daily life could be developed for older persons. In this study, we focused on the nurse assistants (NAs) perspectives, as their knowledge is essential for a well-functioning team and quality of care. The aim was to learn from NAs experiences and knowledge about how to develop a meaningful daily life for older persons in nursing homes and the meaning NAs ascribe to their work. Methods: The project is based on Participatory and Appreciative Action and Reflection. Data were generated through interviews, participating observations and informal conversations with 27 NAs working in nursing homes in Sweden, and a thematic analysis was used. Result: NAs developed a meaningful daily life by sensing and finding the right way of being (Theme 1). They sense and read the older person in order to judge how the person was feeling (Theme 2). They adapt to the older person (Theme 3) and share their daily life (Theme 4). NAs use emotional involvement to develop a meaningful daily life for the older person and meaning in their own work (Theme 5), ultimately making each others daily lives meaningful. Conclusion: It was obvious that NAs based the development of a meaningful daily life on different forms of knowledge: the oreticaland practical knowledge, and practical wisdom, all of which are intertwined. These results could be used within the team to constitute a meaningful daily life for older persons in nursing homes.

James, Inger; Fredriksson, Carin; Wahlstrom, Catrin; Kihlgren, Annica; Blomberg, Karin

2014-01-01

390

Microbial naphthenic Acid degradation.  

PubMed

Naphthenic acids (NAs) are an important group of trace organic pollutants predominantly comprising saturated aliphatic and alicyclic carboxylic acids. NAs are ubiquitous; occurring naturally in hydrocarbon deposits (petroleum, oil sands, bitumen, and crude oils) and also have widespread industrial uses. Consequently, NAs can enter the environment from both natural and anthropogenic processes. NAs are highly toxic, recalcitrant compounds that persist in the environment for many years, and it is important to develop efficient bioremediation strategies to decrease both their abundance and toxicity in the environment. However, the diversity of microbial communities involved in NA-degradation, and the mechanisms by which NAs are biodegraded, are poorly understood. This lack of knowledge is mainly due to the difficulties in identifying and purifying individual carboxylic acid compounds from complex NA mixtures found in the environment, for microbial biodegradation studies. This paper will present an overview of NAs, their origin and fate in the environment, and their toxicity to the biota. The review describes the microbial degradation of both naturally occurring and chemically synthesized NAs. Proposed pathways for aerobic NA biodegradation, factors affecting NA biodegradation rates, and possible bioremediation strategies are also discussed. PMID:20359455

Whitby, Corinne

2010-01-01

391

When to stop nucleos(t)ide analogues treatment for chronic hepatitis B? Durability of antiviral response  

PubMed Central

Introduction of nucleos(t)ide analogues (NAs) for oral antiviral therapy has dramatically improved the clinical outcome in patients with chronic hepatitis B (CHB). Although current international guidelines for the management of CHB provide information regarding when to begin the antiviral therapy with NAs, there is no clear consensus on when to stop the treatment, especially for those who respond to the therapy. Hepatitis B surface antigen loss has been regarded as an ideal endpoint of oral antiviral therapy with NAs, however since this is rarely achieved, practical endpoints have been suggested by the international guidelines. Despite the stopping rules recommended by the international guidelines, whether oral antiviral therapy with NAs can be safely discontinued is of major concern. While attention has been drawn to whether antiviral treatment with NAs can be a finite therapy, there is lack of sufficient data on off-treatment durability of highly potent NAs. Based on the available evidences, current guidelines for stopping NA therapy seems to be inadequate in terms of off-treatment durability, with relapse rates of more than 40% for both hepatitis Be antigen (HBeAg)-positive and HBeAg-negative patients. Therefore, further studies are required to accumulate data on off-treatment durability of highly potent NAs, and future studies are warranted to identify adequate predictive markers that could provide supplementary information to guide the timing of stopping NA therapy. PMID:24966590

Kang, Wonseok; Park, Jun Yong

2014-01-01

392

LISA 8 Science Organizing Committee and Local Organizing Committee LISA 8 Science Organizing Committee and Local Organizing Committee  

NASA Astrophysics Data System (ADS)

Science Organising Committee (SOC) Tom Abel, Stanford University Odylio Aguiar, Instituto Nacional de Pesquisas Espaciais Tal Alexander, Wizemann Institute Peter Bender, University of Colorado Pierre Binetruy, APC - College de France Sasha Buchman, Stanford University Robert Byer, Stanford University Manuela Campanelli, University of Texas Joan Centrella, NASA/Goddard Massimo Cerdonio, University of Padova Eugenio Coccia, University of Roma-2 Neil Cornish, Montana State University Michael Cruise, University of Birmingham Curt Cutler, NASA/JPL Karsten Danzmann, University of Hannover Sam Finn, Penn State University Jens Gundlach, NPL Gerhard Heinzel, Max-Planck-Institut fuer Gravitationsphysik Craig Hogan, University of Washington Jim Hough, University of Glasgow Scott Hughes, MIT Oliver Jennrich, ESTEC Philippe Jetzer, University Zurich Seiji Kawamura, National Observatory, Japan Alberto Lobo, ICE-CSIC and IEEC Avi Loeb, Harvard University Piero Madau, Lick Observatory Yannick Mellier, IAP, Paris Peter Michelson, Stanford University Guido Mueller, University of Florida Sterl Phinney, Caltech Tom Prince, NASA/JPL Doug Richstone, University of Michigan Bernard Schutz, AEI Potsdam Tuck Stebbins, NASA/Goddard Tim Sumner, Imperial College, London Ke-Xun Sun, Stanford University Kip Thorne, Caltech Michele Vallisneri, NASA/JPL Alberto Vecchio, University of Birmingham Jean-Yves Vinet, OCA, Nice Stefano Vitale, University of Trento Rai Weiss, MIT Nick White, NASA/Goddard Local Organising Committee (LOC) Sasha Buchman (Stanford University) Robert Byer (Stanford University) Sara Charbonneau-Lefort (Stanford University) Nancy Christianson (Stanford University) John Conklin (Stanford University) Dan DeBra (Stanford University) Jan Goebel (Stanford University) Vivian Drew (Stanford University) Ke-Xun Sun (Stanford University) Lucy Zhou (Stanford University) Andrea Zoellner (Stanford University)

2011-05-01

393

Jpcam: a 1.2 Gpixel Camera for the J-Pas Survey  

NASA Astrophysics Data System (ADS)

JPCam is a 14-CCD mosaic camera, using the new e2v 9k-by-9k 10 ?m-pixel 16-channel detectors, to be deployed on a dedicated 2.55 m wide-field telescope at the OAJ (Observatorio Astrofsico de Javalambre) in Aragon, Spain. The camera is designed to perform a Baryon Acoustic Oscillations (BAO) survey of the northern sky. The J-PAS survey strategy will use 54 relatively narrow-band ( 13.8 nm) filters equi-spaced between 370 and 920 nm plus 3 broad-band filters to achieve unprecedented photometric red-shift accuracies for faint galaxies over 8000 square degrees of sky. The cryostat, detector mosaic and read electronics, is being supplied by e2v under contract to J-PAS while the mechanical structure, housing the shutter and filter assembly, is being designed and constructed by a Brazilian consortium led by INPE (Instituto Nacional de Pesquisas Espaciais). The cryostat is bridged to the telescope via a hexapod actuator system to maintain image quality across the field. Four sets of 14 filters are placed in the ambient environment, just above the dewar window but directly in line with the detectors, leading to a mosaic having 10 mm gaps between each CCD. The massive 500 mm aperture shutter is expected to be supplied by the Bonn-Shutter UG. We will present an overview of JPCam, from the filter configuration through to the CCD mosaic camera. A brief outline of the main J-PAS science projects will be included.

Taylor, K.; Marn-Franch, A.; Laporte, R.; Santoro, F. G.; Marrara, L.; Cepa, J.; Cenarro, A. J.; Chueca, S.; Cristobal-Hornillos, D.; Ederoclite, A.; Gruel, N.; Moles, M.; Rueda, F.; Rueda, S.; Varela, J.; Yanes, A.; Benitez, N.; Dupke, R.; Fernndez-Soto, A.; Jorden, P.; Lousberg, G.; Molino Benito, A.; Palmer, I.; Mendes de Oliveira, C.; Sodr, L.

394

Anlisi descriptiva de les variables: nivell d'activitat fsica, depressi i riscos cardiovasculars en treballadors i docents d'una instituci universitria a Medelln (Colmbia)  

Microsoft Academic Search

Objectiu: Identificar els nivells d'activitat fsica, depressi i riscos cardiovasculars dels empleats i docents d'una Instituci Universitria a Medelln, Colmbia (Politcnico Colombiano Jaime Isaza Cadavid). Mtode: De la poblaci de docents i treballadors nascuts a partir del 1955, es va seleccionar una mostra aleatria estratificada segons escala d'edat de Framingham, a la qual es van fer: exmens de laboratori per

Elkin Eduardo Roldn Aguilar; Mara Helena Lopera Zapata; Francisco Javier Londoo Giraldo; Jos Luis Cardeo Tejada; Santiago Alberto Zapata Vidales

2008-01-01

395

ENERGIES RENOVABLES Assignatura de lliure eleccio 51411  

E-print Network

· Energia al m´on · Principis f´isics de conversi´o d'energia · Energia Solar t`ermics · Energia Solar dels recursos (negawatts) i desenvolupar les fonts d'energia renovables. Aquest canvi de model a d potencial de les diferents fonts d'energia renovable, tant a nivell global (escala planet`aria), com

Batiste, Oriol

396

ENERGIA DE L'OCE`A Energia de les ones  

E-print Network

. #12;ENERGIA T`ERMICA OCE`ANICA El mar acumula energia solar a gran escala (1/4 de l'energia que arrivaENERGIA DE L'OCE`A · Energia de les ones · Energia de les marees · Energia t`ermica oce`anic · Energia de les corrents oce`aniques #12;ENERGIA DE LES ONES En algunes zones 40-70 kW/m Aig¨ues profundes

Batiste, Oriol

397

Desenvolvimento mental e motor aos 24 meses de crianas nascidas a termo com baixo peso  

Microsoft Academic Search

RESUMO - Este estudo teve como objetivo comparar o desenvolvimento aos 24 meses de 152 crianas nascidas a termo, com baixo peso (< 2500g) e peso adequado (3000 a 3499g), pareadas numa proporo de 1:1 por sexo e idade. O desenvolviment o mental e motor foram avaliados pela escala de Bayley. Estudaram-se ainda algumas variveis ambientais, como as condies scio-econmicas

Sophie Helena Eickmann; Pedro Israel Cabral de Lira; Marilia de Carvalho Lima

2002-01-01

398

Astrofsica Extragalctica y Cosmologa II Mayo-Julio 2007  

E-print Network

galaxias y estructura a gran escala 1.1 Cúmulos cercanos: Virgo y Coma 1.2 Criterios de selección 1 las galaxias en el cúmulo: relación morfología- densidad, función de luminosidad, evolución II. Materia oscura 2.1 Materia oscura en galaxias 2.2 Materia oscura en cúmulos de galaxias 2.3 Propiedades y

Aretxaga, Itziar

399

Astrofsica Extragalctica y Cosmologa. Problemas y preguntas clave I.  

E-print Network

relación liga al corrimiento al rojo con el factor de escala del universo. 7. Dadas 3 galaxias A=1, en promedio, su altura se habría incrementado un factor 2 d. La galaxia Andrómeda está un factor 2 más alejada e. La galaxia Andrómeda está un factor ½ menos alejada f. La distancia Vía Láctea

Aretxaga, Itziar

400

Astrofsica Extragalctica y Cosmologa. Problemas y preguntas clave I.  

E-print Network

relación liga al corrimiento al rojo con el factor de escala del universo. 7. Dadas 3 galaxias A factor 2 d. La galaxia Andrómeda está un factor 2 más alejada e. La galaxia Andrómeda está un factor distancia Vía Láctea ­ Andrómeda es constante a lo largo del tiempo h. Las distancias entre las galaxias en

Aretxaga, Itziar

401

INFLUENCIA DE LA ARIDEZ CLIMTICA, LA ALTITUD Y LA DISTANCIA AL MAR SOBRE EL CONTENIDO EN CLORURO Y EN  

E-print Network

EN 18 O DEL AGUA DE RECARGA Y DEL AGUA SUBTERRÁNEA EN MACIZOS CARBONATADOS COSTEROS DEL SE PENINSULAR es un buen ejemplo de acuífero carbonatado libre a escala regional con posibilidad de mezcla del agua de entre 0.5 y 1 g m-2 a-1 km-1 . El contenido en Cl del agua de recarga con escasa interacción agua

Nacional de San Luis, Universidad

402

TEMARIO PARA EL EXAMEN DE QUIMICA Los nmeros en negritas corresponden a la bibliografa recomendada.  

E-print Network

-159, Cap. 13, págs. 342-365, 2, Cap. 1, págs. 27-28]. 9. pH. Ionización del agua. Constante de ionización del agua. Producto iónico del agua. Expresión de las concentraciones de iones hidrógeno: pH. Escala de agua, solvente principal de los sistemas biológicos Estructura de la molécula de agua. Estructura

403

Desarrollo y Aplicacin de un ndice de Calidad de Agua para ros en Puerto Rico  

E-print Network

Desarrollo y Aplicación de un Índice de Calidad de Agua para ríos en Puerto Rico por Francisco J trabajo presenta la elaboración de un Índice de Calidad de Agua (ICA) para los ríos en Puerto Rico. Dicho índice pretende clasificar en una escala de 0 a 100 la calidad representativa del agua, según los

Gilbes, Fernando

404

Environmental, health, and safety issues of sodium-sulfur batteries for electric and hybrid vehicles  

SciTech Connect

Recycling and disposal of spent sodium-sulfur (Na/S) batteries are important issues that must be addressed as part of the commercialization process of Na/S battery-powered electric vehicles. The use of Na/S batteries in electric vehicles will result in significant environmental benefits, and the disposal of spent batteries should not detract from those benefits. In the United States, waste disposal is regulated under the Resource Conservation and Recovery Act (RCRA). Understanding these regulations will help in selecting recycling and disposal processes for Na/S batteries that are environmentally acceptable and cost effective. Treatment processes for spent Na/S battery wastes are in the beginning stages of development, so a final evaluation of the impact of RCRA regulations on these treatment processes is not possible. The objectives of tills report on battery recycling and disposal are as follows: Provide an overview of RCRA regulations and requirements as they apply to Na/S battery recycling and disposal so that battery developers can understand what is required of them to comply with these regulations; Analyze existing RCRA regulations for recycling and disposal and anticipated trends in these regulations and perform a preliminary regulatory analysis for potential battery disposal and recycling processes. This report assumes that long-term Na/S battery disposal processes will be capable of handling large quantities of spent batteries. The term disposal includes treatment processes that may incorporate recycling of battery constituents. The environmental regulations analyzed in this report are limited to US regulations. This report gives an overview of RCRA and discusses RCRA regulations governing Na/S battery disposal and a preliminary regulatory analysis for Na/S battery disposal.

Corbus, D.

1992-09-01

405

Expression and characterization of the assimilatory NADH-nitrite reductase from the phototrophic bacterium Rhodobacter capsulatus E1F1  

Microsoft Academic Search

A nas gene region from Rhodobacter capsulatus E1F1 containing the putative nasB gene for nitrite reductase was previously cloned. The recombinant His6-NasB protein overproduced in E. coli showed nitrite reductase activity in vitro with both reduced methyl viologen and NADH as electron donors. The apparent K\\u000a \\u000a m\\u000a values for nitrite and NADH were 0.5mM and 20?M, respectively, at the pH

M. Francisca Olmo-Mira; Purificacin Cabello; Carmen Pino; Manuel Martnez-Luque; David J. Richardson; Francisco Castillo; M. Dolores Roldn; Conrado Moreno-Vivin

2006-01-01

406

Alternative Architectures for Distributed Work in the National Airspace System  

NASA Technical Reports Server (NTRS)

The architecture for the National Airspace System (NAS) in the United States has evolved over time to rely heavily on the distribution of tasks and control authority in order to keep cognitive complexity manageable for any one individual. This paper characterizes a number of different subsystems that have been recently incorporated in the NAS. The goal of this discussion is to begin to identify the critical parameters defining the differences among alternative architectures in terms of the locus of control and in terms of access to relevant data and knowledge. At an abstract level, this analysis can be described as an effort to describe alternative "rules of the game" for the NAS.

Smith, Philip J.; Billings, Charles E.; Chapman, Roger; Obradovich, Heintz; McCoy, C. Elaine; Orasanu, Judith

2000-01-01

407

Review and evaluation of national airspace system models  

E-print Network

Abstract from Technical Report Documentation Page: This report is intended to serve as a guide to the availability and capability of state-of-the-art analytical and simulation models of the National Airspace System (NAS). ...

Odoni, Amedeo R.

1979-01-01

408

In our assessment of the services below, one thing was clear: no recommendation service is perfect. While you would expect different systems to come up with different suggestions, we were struck by the blind spots or totally off-the-wall suggestions  

E-print Network

by the blind spots or totally off-the-wall suggestions that bedevilled each one. (A truly intelligent-On, NAAM Brigade, Freddie Foxxx, Nas, Notorious BIG, Shyne The Sundays 9/10 Dressy Bessy, Helium, Tsunami

Mántaras, Ramon López de

409

78 FR 78302 - Proposed Modification and Establishment of Air Traffic Service (ATS) Routes in the Vicinity of...  

Federal Register 2010, 2011, 2012, 2013

...to the scheduled decommissioning of the Huntingburg...aeronautical, economic, environmental, and energy-related...actions to propose decommissioning the facility. As...T-325. The scheduled decommissioning of the HNB VOR...within the NAS. Environmental Review This...

2013-12-26

410

Maria Adelaide Amaral ou a Crise da Classe Mdia Brasileira  

E-print Network

guerrilha, ditadura introduzida pela personagem Paulo, evocada nas lembranas de Sergio e Lusa. Esta personagem vista como uma espcie de patrimnio da classe mdia alta, uma reserva de heroicidade, de aventura, de encanto. Mas, finalmente, ...

Ravetti, Graciela; Rojo, Sara

1996-10-01

411

Geothermal resource evaluation at Naval Air Station Fallon, Nevada. Final report, June 1985-August 1986  

SciTech Connect

During the summer of 1986, Fallon Observation Hole 2 (FOH-2) was drilled in the southeast corner of Naval Air Station (NAS) Fallon, Nevada, to provide additional information on the geothermal resource at that installation.

Katzenstein, A.M.; Bjornstad, S.C.

1987-08-01

412

76 FR 81834 - Extension of Statutory Period for Compensation for Certain Disabilities Due to Undiagnosed...  

Federal Register 2010, 2011, 2012, 2013

...undiagnosed illnesses, the Secretary...undiagnosed illness must become...scope of those health outcomes the...Gulf War and Health, Volume 8: Update of Health Effects of...multi-symptom illnesses in Gulf War...multi-symptom illness. NAS...

2011-12-29

413

Competition and congestion in the National Aviation System : multi-agent, multi-stakeholder approaches for evaluation and mitigation  

E-print Network

The US National Aviation System (NAS) is a complex system with multiple, interacting agents including airlines, passengers, and system operators, each with somewhat different objectives and incentives. These interactions ...

Vaze, Vikrant (Vikrant Suhas)

2011-01-01

414

75 FR 54942 - Agency Information Collection Activities: Requests for Comments; Clearance of a New Approval of...  

Federal Register 2010, 2011, 2012, 2013

...System (NAS). Essential to the assessment is a survey of airline and corporate pilots and dispatchers as well as airport operators...externally to general aviation pilots, airport operations staff and airline pilots and dispatchers. This Paperwork Reduction Act...

2010-09-09

415

76 FR 9400 - Agency Information Collection Activities: Requests for Comments; Clearance of Renewed Approval of...  

Federal Register 2010, 2011, 2012, 2013

...determine if unacceptable hazards exist within the National Airspace System (NAS). Essential to the assessment is a survey of airline and corporate pilots and dispatchers as well as airport operators and general aviation pilots. DATES: Written comments...

2011-02-17

416

21 CFR 524.1580e - Nitrofurazone ointment with butacaine sulfate.  

Code of Federal Regulations, 2010 CFR

...Indications for use. For prevention or treatment of surface bacterial infections of ears, wounds, burns, and cutaneous ulcers of dogs, cats, and horses.1 1 These conditions are NAS/NRC reviewed and deemed effective. Applications for...

2010-04-01

417

21 CFR 524.1580e - Nitrofurazone ointment with butacaine sulfate.  

Code of Federal Regulations, 2011 CFR

...Indications for use. For prevention or treatment of surface bacterial infections of ears, wounds, burns, and cutaneous ulcers of dogs, cats, and horses.1 1 These conditions are NAS/NRC reviewed and deemed effective. Applications for...

2011-04-01

418

21 CFR 524.1580e - Nitrofurazone ointment with butacaine sulfate.  

Code of Federal Regulations, 2012 CFR

...Indications for use. For prevention or treatment of surface bacterial infections of ears, wounds, burns, and cutaneous ulcers of dogs, cats, and horses.1 1 These conditions are NAS/NRC reviewed and deemed effective. Applications for...

2012-04-01

419

21 CFR 524.1580e - Nitrofurazone ointment with butacaine sulfate.  

Code of Federal Regulations, 2013 CFR

...Indications for use. For prevention or treatment of surface bacterial infections of ears, wounds, burns, and cutaneous ulcers of dogs, cats, and horses.1 1 These conditions are NAS/NRC reviewed and deemed effective. Applications for...

2013-04-01

420

Development of remedial process options: Phase II, Feasibility study: Installation Restoration Program, Naval Air Station Fallon, Fallon, Nevada  

SciTech Connect

This technical memorandum develops process options which are appropriate for environmental restoration activities at Naval Air Station Fallon (NAS Fallon), Nevada. Introduction of contaminants to the environment has resulted from deliberate disposal activities (both through dumping and landfilling) and accidental spills and leaks associated with normal activities at NAS Fallon over its lifetime of operation. Environmental sampling results indicate that the vast majority of contaminants of concern are petroleum hydrocarbon related. These contaminants include JP-4, JP-5, leaded and unleaded gasoline, waste oils and lubricants, hydraulic fluids, and numerous solvents and cleaners. The principal exposure pathways of concern associated with NAS Fallon contaminants appear to be the surface flows and shallow drainage systems to which the base contributes. Available data indicate NAS Fallon IR Program sites are not contributing excessive contamination to surface flows emanating from the base. Contaminants appear to be contained in a relatively immobile state in the shallow subsurface with little or no contaminant migration off site.

Cronk, T.A.; Smuin, D.R. [Oak Ridge National Lab., TN (United States); Schlosser, R.M. [Oak Ridge Associated Universities, Inc., TN (United States)

1991-11-01

421

Morphological and Molecular Characterization of Hematodinium perezi (Dinophyceae: Syndiniales), a Dinoflagellate Parasite of the Harbour Crab,  

E-print Network

two portunid crab species, Carcinus mae- nas Linnaeus, 1758, and Liocarcinus depurator Linnaeus, 1758, was described from the Australian sand crab, Portunus pelagicus Linnaeus, 1758. It was determined to be distinct

422

ONTOGENY OF PROTEINS FOR USE AS BIOMARKERS OF DEVELOPMENTAL NEUROTOXICITY.  

EPA Science Inventory

The developing nervous system can be uniquely susceptible to adverse effects following exposure to environmental chemicals, and several advisory panels (e.g. ILSI, NRC, NAS) have highlighted the need for rapid and sensitive developmental neurotoxicity testing methods. Measurement...

423

JWST Secondary Mirror Deploy Timelapse  

NASA Video Gallery

Setting up NASA's James Webb Space Telescope's secondary mirror in space will require special arms that resemble a tripod that was recently demonstrated in a NASA cleanroom. TRT: 1:25 / Credit: NAS...

424

Higher maternal doses of methadone does not increase neonatal abstinence syndrome  

Microsoft Academic Search

ObjectiveThe purpose of this study is to assess the incidence of clinically significant neonatal abstinence syndrome (NAS) based on maternal antenatal methadone dosing in women with a history of narcotic dependence.

David Pizarro; Mounira Habli; Marquia Grier; Annette Bombrys; Baha Sibai; Jeffrey Livingston

2011-01-01

425

Reliability and validity assessment of the job attitude scale.  

PubMed

Job satisfaction among nursing assistants (NAs) is associated with NA retention, resident satisfaction, and residents' quality of care. The purpose of this study was to provide psychometric support for a measure of job satisfaction, the Job Attitude Scale (JAS), used with NAs that work in long-term care facilities. We performed a secondary data analysis and used traditional test theory and Rasch analysis to assess the reliability and validity of the JAS. The sample consisted of 508 NAs from 12 nursing homes and 96 NAs from 4 assisted living communities. We found evidence of reliability, validity, and generalizability when the measure was used in both settings and evidence that the JAS has the ability to assess variability in job satisfaction. PMID:22695249

Flannery, Kelly; Resnick, Barbara; Galik, Elizabeth; Lipscomb, Jane; McPhaul, Kathleen

2012-01-01

426

Predicting pilot intent and aircraft trajectory in uncontrolled airspace  

E-print Network

The ability to predict the likely trajectory is a key element of safely integrating Unmanned Aerial Systems (UAS) in the National Airspace System (NAS). A particularly challenging environment is in the vicinity of uncontrolled ...

Lowe, Christopher D., S.M. (Christopher David). Massachusetts Institute of Technology

2014-01-01

427

41 CFR Appendix A to Subpart E of... - 3-Key Points and Principles  

...Recommendations Provided to Agencies by the National Academy of Sciences or the National Academy of Public Administration? Pt. 102-3... I. Section 15 of the Act allows the National Academy of Sciences (NAS) and the National Academy of Public...

2014-01-01

428

41 CFR 102-3.185 - What does this subpart require agencies to do?  

...Recommendations Provided to Agencies by the National Academy of Sciences or the National Academy of Public Administration? 102-3...recommendation provided to an agency by the National Academy of Sciences (NAS) or the National Academy of Public...

2014-01-01

429

41 CFR 102-3.180 - What does this subpart cover and how does it apply?  

...Recommendations Provided to Agencies by the National Academy of Sciences or the National Academy of Public Administration? 102-3...recommendations provided to the agency by the National Academy of Sciences (NAS) or the National Academy of Public Administration...

2014-01-01

430

76 FR 36447 - Safety Zone; Patuxent River, Patuxent River, MD  

Federal Register 2010, 2011, 2012, 2013

...USCG-2011-0426] RIN 1625-AA00 Safety Zone; Patuxent River, Patuxent River, MD AGENCY: Coast Guard, DHS. ACTION: Notice of...a temporary safety zone during the ``NAS Patuxent River Air Expo '11'', which consists of aerial...

2011-06-22

431

76 FR 51887 - Safety Zone; Patuxent River, Patuxent River, MD  

Federal Register 2010, 2011, 2012, 2013

...USCG-2011-0426] RIN 1625-AA00 Safety Zone; Patuxent River, Patuxent River, MD AGENCY: Coast Guard, DHS. ACTION: Temporary...a temporary safety zone during the ``NAS Patuxent River Air Expo '11,'' which consists of aerial...

2011-08-19

432

75 FR 47736 - Amendment of Class D and E Airspace, Establishment of Class E Airspace; Patuxent River, MD  

Federal Register 2010, 2011, 2012, 2013

...Establishment of Class E Airspace; Patuxent River, MD AGENCY: Federal Aviation Administration...amend the Class D and E airspace at Patuxent River Naval Air Station (NAS), Patuxent River, MD, to reflect the part-time operating...

2010-08-09

433

75 FR 59608 - Amendment of Class D and E Airspace; Establishment of Class E Airspace; Patuxent River, MD  

Federal Register 2010, 2011, 2012, 2013

...Establishment of Class E Airspace; Patuxent River, MD AGENCY: Federal Aviation Administration...action amends Class D and E Airspace at Patuxent River Naval Air Station (NAS), Patuxent River, MD, to reflect the part-time operating...

2010-09-28

434

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, VOL. 37, NO. 2, MARCH 1999 987 An Analytical Hybrid GORT Model for Bidirectional  

E-print Network

Hybrid GORT Model for Bidirectional Reflectance Over Discontinuous Plant Canopies Wenge Ni, Member, IEEE in part by U.S. Army Corps of Engineering under Contract DACA89-93-k-00012; by NASA under Contract NAS5

Ni-Meister, Wenge

435

75 FR 57848 - Revocation of Class E Airspace, Brunswick, ME; and Establishment of Class E Airspace, Wiscasset, ME  

Federal Register 2010, 2011, 2012, 2013

...Revocation of Class E Airspace, Brunswick, ME; and Establishment of Class E Airspace, Wiscasset, ME AGENCY: Federal Aviation Administration (FAA...Class E Airspace at Brunswick NAS, Brunswick, ME, as the airport has closed and the...

2010-09-23

436

Identification of Robust Routes using Convective Weather Forcasts  

E-print Network

Convective weather is responsible for large delays and widespread disruptions in the U.S. National Airspace System (NAS), especially during summer months when travel demand is high. This has been the motivation for Air ...

Michalek, Diana

437

75 FR 17645 - Polychlorinated Biphenyls (PCBs); Reassessment of Use Authorizations  

Federal Register 2010, 2011, 2012, 2013

...much does it cost to identify and test (sample collection, extraction, chemical analysis, and recordkeeping) liquid filled...Reassessment of 2,3,7,8- Tetrachlorodibenzo-p-Dioxin (TCDD) and Related Compounds National Academy Sciences (NAS)...

2010-04-07

438

Neonatal abstinence syndrome: essentials for the practitioner.  

PubMed

The incidence of neonatal abstinence syndrome (NAS) has increased dramatically during the past 15 years, likely due to an increase in antepartum maternal opiate use. Optimal care of these patients is still controversial because of the available published literature lacking sufficient sample size, placebo control, and comparative pharmacologic trials. Primary treatment for NAS consists of opioid replacement therapy with either morphine or methadone. Paregoric and tincture of opium have been abandoned because of relative safety concerns. Buprenorphine is emerging as a treatment option with promising initial experience. Adjunctive agents should be considered for infants failing treatment with opioid monotherapy. Traditionally, phenobarbital has been used as adjunctive therapy; however, results of clonidine as adjunctive therapy for NAS appear to be beneficial. Future directions for research in NAS should include validating a simplified scoring tool, conducting comparative studies, exploring home management options, and optimizing management through pharmacogenomics. PMID:25309144

Siu, Anita; Robinson, Christine A

2014-07-01

439

64 FR 59232 - Diseases Not Associated With Exposure to Certain Herbicide Agents  

Federal Register 2010, 2011, 2012, 2013

...Nasal/Nasopharyngeal Cancer NAS noted that exposure to nickel, chromates, wood dust and formaldehyde are risk factors for...spontaneous abortion, spina bifida and other birth defects, neonatal/infant deaths and stillbirths, low birth weights, and...

1999-11-02

440

Concept development and evaluation of airborne traffic displays  

E-print Network

A system concept for a cockpit traffic situation display (TSD) was developed and a preliminary evaluation was undertaken to investigate the effect of a TSD on safety, efficiency, and capacity in the 3rd generation NAS/ARTS ...

Imrich, Thomas

1971-01-01

441

List of Participants 1. Dmitry L. ABRAROV (Computing Center of Academy of Science, Moscow, RUSSIA)  

E-print Network

of Continuing Special Education, Pridniprovsk State University of Civil Engineering, Dnipropetrovsk, UKRAINE) e BELOKOLOS (Institute of Magnetism of NAS of Ukraine, Kyiv, UKRAINE) e-mail: bel@imag.kiev.ua 17. Carl M

Popovych, Roman

442

21 CFR 202.1 - Prescription-drug advertisements.  

Code of Federal Regulations, 2010 CFR

...advertisements which are intended to provide consumers with information concerning the price...National Academy of Sciences/National Research Council (NAS/NRC), Drug Efficacy Study...act include advertisements in published journals, magazines, other periodicals,...

2010-04-01

443

Evaluating passenger delays in the US domestic air transportation system  

E-print Network

A fundamental component of any National Airspace System (NAS) performance evaluation is the cost impact of air traffic delays, and more generally capacity limitations, on the traveling passengers. In previous research it ...

Umang, Nitish

2010-01-01

444

core-collapse SNe played an important role in the production of dust in the early universe.  

E-print Network

, Astrophys. J. 499, 267 (1998). 3. E. Dwek, Astrophys. J. 501, 643 (1998). 4. F. Cernuschi, F. R. Marsicano), under NASA contract NAS 5-26555; and on observations obtained during the program GN-2004B-C-3

Boxer, Steven G.

445

Using tactical flight level resource allocation to alleviate congested en-route airspace  

E-print Network

A motivation exists to formulate and implement new tools and methodologies to address the problem of congestion in the National Airspace System (NAS). This thesis presents a novel methodology for allocating aircraft among ...

Abad, Antonio Manuel, 1976-

2004-01-01

446

75 FR 32540 - Health Effects Not Associated With Exposure to Certain Herbicide Agents  

Federal Register 2010, 2011, 2012, 2013

...basal cell and squamous cell); breast cancer; cancers of reproductive organs...basal cell and squamous cell); breast cancer; cancers of reproductive organs...basal-cell or squamous-cell cancer. Breast Cancer NAS reviewed several...

2010-06-08

447

Degradation of Sodium beta''-Alumina Electrolyte in Contact with Sulfur/Sodium Polysulfide Melts.  

National Technical Information Service (NTIS)

Immersion of sodium beta '' alumina electrolyte in sodium polysulfide and pure sulfur melts, at Na/S battery operation temperatures, showed that the electrolyte was chemically attacked by the melts. The corrosion reactions mostly initiated and concentrate...

M. Liu

1986-01-01

448

Sodium-sulfur battery flight experiment definition study  

NASA Technical Reports Server (NTRS)

Sodium-sulfur batteries are considered to be one of the most likely battery systems for space applications. Compared with the Ni-H2 or Ni-Co battery systems, Na-S batteries offer a mass reduction by a factor of 2 to 4, representing significant launch cost savings or increased payload mass capabilities. The Na-S battery operates at between 300 and 400 C, using liquid sodium and sulfur/polysulfide electrodes and solid ceramic electrolyte; the transport of the electrode materials to the surface of the electrolyte is through wicking/capillary forces. This paper describes five tests identified for the Na-S battery flight experiment definition study, which include the cell characterization test, the reactant distribution test, the current/temperature distribution test, the freeze/thaw test, and the multicell LEO test. A schematic diagram of Na-S cell is included.

Chang, Rebecca; Minck, Robert

1990-01-01

449

Evidence-based nurse-driven interventions for the care of newborns with neonatal abstinence syndrome.  

PubMed

Neonatal abstinence syndrome (NAS) is a growing problem in the United States, related to increased maternal substance use and abuse, and a set of drug withdrawal symptoms that can affect the central nervous system and gastrointestinal and respiratory systems in the newborn when separated from the placenta at birth. Infants with NAS often require a significant length of stay in the neonatal intensive care unit (NICU). Pharmacologic treatments and physician-directed interventions are well researched, but nursing-specific interventions and recommendations are lacking. A thorough review and analysis of the literature and interviews with neonatal experts guided the development of a nursing clinical practice guideline for infants with NAS in a level IV NICU. Recommended nursing-specific interventions include methods for maternal drug-use identification, initiation and timing of the Finnegan Scoring System to monitor withdrawal symptoms, and bedside interventions to lessen the drug-withdrawal symptoms in the newborn with NAS. PMID:25068529

Casper, Tammy; Arbour, Megan

2014-12-01

450

A stochastic and dynamic model of delay propagation within an airport network for policy analysis  

E-print Network

As demand for air travel increases over the years and many busy airports operate close to their capacity limits, congestion at some airports on any given day can quickly spread throughout the National Aviation System (NAS). ...

Pyrgiotis, Nikolaos

2012-01-01

451

Neonatal Abstinence Syndrome: Essentials for the Practitioner  

PubMed Central

The incidence of neonatal abstinence syndrome (NAS) has increased dramatically during the past 15 years, likely due to an increase in antepartum maternal opiate use. Optimal care of these patients is still controversial because of the available published literature lacking sufficient sample size, placebo control, and comparative pharmacologic trials. Primary treatment for NAS consists of opioid replacement therapy with either morphine or methadone. Paregoric and tincture of opium have been abandoned because of relative safety concerns. Buprenorphine is emerging as a treatment option with promising initial experience. Adjunctive agents should be considered for infants failing treatment with opioid monotherapy. Traditionally, phenobarbital has been used as adjunctive therapy; however, results of clonidine as adjunctive therapy for NAS appear to be beneficial. Future directions for research in NAS should include validating a simplified scoring tool, conducting comparative studies, exploring home management options, and optimizing management through pharmacogenomics. PMID:25309144

Robinson, Christine A.

2014-01-01

452

David Cahen, Weizmann Institute of Science 11/2009 THANKS TO MANY COLLEAGUES, ESP.  

E-print Network

Acid Batteries Flow Batteries (Vanadium) Na-S Batteries Compressed Air Pumped Hydro System Power Rating High Power supercapacitors Ni-Cd Batteries Li-ion Batteries High-Speed Flywheels Metal Air Batteries

Martin, Jan M.L.

453

Safety considerations for operation of different classes of unmanned aerial vehicles in the National Airspace System  

E-print Network

There is currently a broad effort underway in the United States and internationally by several organizations to craft regulations enabling the safe operation of UAVs in the NAS. Current federal regulations governing unmanned ...

Weibel, Roland E. (Roland Everett)

2005-01-01

454

Safety Considerations for Operation of Unmanned Aerial Vehicles in the National Airspace System  

E-print Network

There is currently a broad effort underway in the United States and internationally by several organizations to craft regulations enabling the safe operation of UAVs in the NAS. Current federal regulations governing unmanned ...

Weibel, Roland E

2006-11-21

455

EDITAL DE BOLSAS CULTURA 2013 MUSEU DE ARQUEOLOGIA E ETNOLOGIA DA UFPR  

E-print Network

EDITAL DE BOLSAS CULTURA 2013 MUSEU DE ARQUEOLOGIA E ETNOLOGIA DA UFPR O MAE UFPR abre Edital de seleção de Bolsas Cultura para o desenvolvimento de atividades culturais e educativas nas Unidades do

Paraná, Universidade Federal do

456

Krypton Fluoride Laser Driven Inertial Fusion Energy  

E-print Network

1 Krypton Fluoride Laser Driven Inertial Fusion Energy Presented to NAS Committee on the Prospects Fluoride (KrF) Laser? · Gas Laser--Excimer (Excited Dimer) · Fundamental wavelength is 248 nm · Energy

457

ADVISORY ON UPDATED METHODOLOGY FOR ESTIMATING CANCER RISKS FROM EXPOSURE TO IONIZING RADIATION  

EPA Science Inventory

The National Academy of Sciences (NAS) published the Biological Effects of Ionizing Radiation (BEIR) committee's report (BEIR VII) on risks from ionizing radiation exposures in 2006. The Committee analyzed the most recent epidemiology from the important exposed cohorts and factor...

458

77 FR 70140 - Emerging Technology and Research Advisory Committee; Notice of Partially Closed Meeting  

Federal Register 2010, 2011, 2012, 2013

...Provision 5. 3D Bio-printing 6. NAS study on Nanotech Initiative ``tentative'' 7. Rare Earths Study 8. Additive Manufacturing ``tentative'' The open sessions will be accessible via teleconference to 40 participants on a first...

2012-11-23

459

Shuttle Replica On The Way To Space Center Houston  

NASA Video Gallery

Atop a barge, the space shuttle full-scale replica nears the completion of its eight-day journey from the Kennedy Space Center destined for permanent retention at Space Center Houston, near the NAS...

460

Exercise habits of licensed nurses and nursing assistants: are they meeting national guidelines?  

PubMed

Research shows licensed practical nurses and nursing assistants (NAs) have high rates of obesity and hypertension, potentially from limited engagement in physical activity (PA). Therefore, the purpose of this paper was to describe the self-reported exercise engagement, of licensed nurses (i.e., registered and licensed practical nurses) and NAs. We performed a secondary data analysis of two studies that used the Behavioral Risk Factor Surveillance System - PA questionnaire to assess PA levels. The sample consisted of 31 NAs and 40 licensed nurses. Our findings show 50 (56.9%) NAs and licensed nurses report they engage in enough exercise to meet national guidelines. Our sample reported engaging in more exercise than the general population. We suspect measurement biases as over half of our sample reported engaging in at least 300 min of exercise each week. The potential over-reporting could be due to the perception of their work since they do not have sedentary jobs. PMID:24702714

Flannery, Kelly; Burket, Tamara L; Resnick, Barbara

2014-01-01

461

IRIS Toxicological Review of Formaldehyde (Inhalation) (External Review Draft 2010)  

EPA Science Inventory

UPDATE EPA is currently revising its Integrated Risk Information System (IRIS) assessment of formaldehyde to address the 2011 NAS peer review recommendations. This assessment addresses both noncancer and cancer human health effects that are relevant to assessing ...

462

Dynamic reconfiguration of terminal airspace during convective weather  

E-print Network

Dynamic airspace configuration (DAC) algorithms strive to restructure the U.S. National Airspace System (NAS) in ways that allow air traffic control to better manage aircraft flows. Although past research has largely focused ...

Michalek, Diana

463

CONTRIBUTION OF SEMI-VOLATILE PARTICULATE MATTER TO AMBIENT SUSPENDED FINE PARTICLE MASS  

EPA Science Inventory

Scope: The periodic (5 years) review of the National Ambient Air Quality Standard (NAAQS) for particulate matter (PM) and the subsequent determination by EPA and NAS of particulate matter research needs have identified areas of uncertainty including exposure measurement th...

464

VOLUME 17, NUMBER 2, 2008 n LINCOLN LABORATORY JOURNAL 41 A Comprehensive Aircraft  

E-print Network

of the economy and the freedom to travel. Use of this resource is stressed, however, by demands placed to introduce unmanned aircraft safely into the NAS. In each of these cases, new sensor and automation system

Reuter, Martin

465

48 CFR 836.501 - Performance of work by the contractor.  

Code of Federal Regulations, 2010 CFR

...236-1, Performance of Work by the Contractor. When the solicitations or contracts include a section entitled Network Analysis System (NAS), the contracting officer must use the clause with its Alternate...

2010-10-01

466

48 CFR 852.236-72 - Performance of work by the contractor.  

Code of Federal Regulations, 2010 CFR

...For requirements which include Network Analysis System (NAS), substitute the...required by Section 01310 or 01311, NETWORK ANALYSIS SYSTEM, a responsibility code for all activities of the network for which the...

2010-10-01

467

Experience and lessons learnt from running high availability databases on network attached storage  

NASA Astrophysics Data System (ADS)

The Database and Engineering Services Group of CERN's Information Technology Department supplies the Oracle Central Database services used in many activities at CERN. In order to provide High Availability and ease management for those services, a NAS (Network Attached Storage) based infrastructure has been setup. It runs several instances of the Oracle RAC (Real Application Cluster) using NFS (Network File System) as shared disk space for RAC purposes and Data hosting. It is composed of two private LANs (Local Area Network), one to provide access to the NAS filers and a second to implement the Oracle RAC private interconnect, both using Network Bonding. NAS filers are configured in partnership to prevent having single points of failure and to provide automatic NAS filer fail-over.

Guijarro, M.; Gaspar, R.

2008-07-01

468

Evaluating the depiction of complex RNAV/RNP procedures and analyzing a potential de-cluttering technique  

E-print Network

Performance Based Navigation (PBN) is a key element of the Federal Aviation Administration's (FAA) NextGen Program. In order to increase National Airspace System (NAS) capacity and efficiency, PBN routes and procedures are ...

Butchibabu, Abhizna

2012-01-01

469

Evidence for sugar signalling in the regulation of asparagine synthetase gene expressed in Phaseolus vulgaris roots and nodules  

Microsoft Academic Search

A cDNA clone, designated as PvNAS2, encoding asparagine amidotransferase (asparagine synthetase) was isolated from nodule tissue of common bean (Phaseolus vulgaris cv. Negro Jamapa). Southern blot analysis indicated that asparagine synthetase in bean is encoded by a small gene family. Northern analysis of RNAs from various plant organs demonstrated that PvNAS2 is highly expressed in roots, followed by nodules in

Sonia Silvente; Pallavolu M. Reddy; Sanghamitra Khandual; Lourdes Blanco; Xochitl Alvarado; Federico Sanchez; Miguel Lara-Flores

2010-01-01

470

Oral clonidine in the management of acquired opioid dependency.  

PubMed

Clonidine is a nonnarcotic analgesic historically used as a nasal decongestant and more recently established as an antihypertensive agent in adults. Because of its sedative properties with few adverse effects, clonidine has also been reported to be an effective pharmacologic agent for the treatment of neonatal abstinence syndrome (NAS). The use of oral clonidine as a primary or secondary agent in the treatment of NAS has been found to reduce hospitalization and duration of treatment in this population. PMID:24195803

Beaulieu, Michele J

2013-01-01

471

CTAS and NASA Air Traffic Management Fact Sheets for En Route Descent Advisor and Surface Management System  

NASA Technical Reports Server (NTRS)

The Surface Management System (SMS) is a decision support tool that will help controllers, traffic managers, and NAS users manage the movements of aircraft on the surface of busy airports, improving capacity, efficiency, and flexibility. The Advanced Air Transportation Technologies (AATT) Project at NASA is developing SMS in cooperation with the FAA's Free Flight Phase 2 (FFP2) pro5ram. SMS consists of three parts: a traffic management tool, a controller tool, and a National Airspace System (NAS) information tool.

Lee, Katharine

2004-01-01

472

Scan for Author Video Interview  

E-print Network

indicated that illicit drug use is 16.2 % among pregnant teens and 7.4 % among pregnant women aged 18 to 25 years. 1 Neonatal abstinence syndrome (NAS) is a drug withdrawal syndrome in newborns following birth. The syndrome most commonly occurs in the context of antepartum opiate use, although other drugs have also been implicated. 2-5 In addition to NAS, illicit drug use (specifically opioid dependence) during pregnancy is associated with a significantly increased risk of adverse neonatal outcomes

Stephen W. Patrick; Robert E. Schumacher; Brian D. Benneyworth; Jennifer M. Mcallister; Matthew M. Davis

473

WORKSHOP ON APPLICATION OF REMOTE SENSING TECHNOLOGIES FOR DISASTER RESPONSE  

E-print Network

. Geological Survey #12;2 NAS - Irvine The San Andreas FaultThe San Andreas Fault #12;3 NAS - Irvine San Andreas faultSan Andreas fault ·· 35 mm/yr slip rate;35 mm/yr slip rate; ·· >70% of total plate>70) Measures buildup of strain on faults due to accumulatingMeasures buildup of strain on faults due

Shinozuka, Masanobu

474

A high-energy room-temperature sodium-sulfur battery.  

PubMed

Employing small sulfur molecules as the active cathode component for room-temperature Na-S batteries, reveals a novel mechanism that is verified for the batteries' electrochemistry. The sulfur cathode enables a complete two-electron reaction to form Na2 S, bringing a tripled specific capacity and an increased specific energy compared with traditional high-temperature Na-S batteries. At the same time, it offers better cycling stability endowing the batteries with a longer lifespan. PMID:24338949

Xin, Sen; Yin, Ya-Xia; Guo, Yu-Guo; Wan, Li-Jun

2014-02-26

475

Fate and effect of naphthenic acids on oil refinery activated sludge wastewater treatment systems.  

PubMed

Naphthenic acids (NAs) are a complex group of alkyl-substituted acyclic, monocyclic and polycyclic carboxylic acids present in oil sands process waters, crude oil, refinery wastewater and petroleum products. Crude oil, desalter brine, influent, activated sludge mixed liquor and effluent refinery samples were received from six United States refineries. The total acid number (TAN) of the six crudes tested ranged from 0.12 to 1.5 mg KOH/g crude oil and correlated to the total NA concentration in the crudes. The total NA concentration in the desalter brine, influent, activated sludge mixed liquor and effluent samples ranged from 4.2 to 40.4, 4.5 to 16.6, 9.6 to 140.3 and 2.8 to 11.6 mg NA/L, respectively. The NAs in all wastewater streams accounted for less than 16% of the total COD, indicating that many other organic compounds are present and that NAs are a minor component in refinery wastewaters. Susceptibility tests showed that none of the activated sludge heterotrophic microcosms was completely inhibited by NAs up to 400 mg/L. Growth inhibition ranging from 10 to 59% was observed in all microcosms at and above 100 mg NA/L. NAs chronically-sorbed to activated sludge mixed liquor biomass and powdered activated carbon (PAC) were recalcitrant and persistent. More than 80% of the total NAs remained in the solid phase at the end of the 10-day desorption period (five successive desorption steps). Throughout a 90-day incubation period, the total NA concentration decreased by 33 and 51% in PAC-free and PAC-containing mixed liquor microcosms, respectively. The lower molecular weight fraction of NAs was preferentially degraded in both mixed liquors. The persistence of the residual, higher molecular weight NAs is likely a combination of molecular recalcitrance and decreased bioavailability when chronically-sorbed to the biomass and/or PAC. PMID:23141768

Misiti, Teresa; Tezel, Ulas; Pavlostathis, Spyros G

2013-01-01

476

A heritable glucosinolate polymorphism within natural populations of Barbarea vulgaris  

Microsoft Academic Search

In natural populations of Barbarea vulgaris we found two distinctly different glucosinolate profiles. The most common glucosinolate profile is dominated (94%) by the hydroxylated form, (S)-2-hydroxy-2-phenylethyl-glucosinolate (glucobarbarin, BAR-type), whereas in the other type 2-phenylethyl-glucosinolate (gluconasturtiin, NAS-type) was most prominent (82%). NAS-type plants have a 108-fold increase of gluconasturtiin concentration in rosette leaves compared to BAR-type plants. The glucosinolate composition of

Hanneke van Leur; Ciska E. Raaijmakers; Nicole M. van Dam

2006-01-01

477

USGS Nonindigenous Aquatic Species database with a focus on the introduced fishes of the lower Tennessee and Cumberland drainages  

USGS Publications Warehouse

The Nonindigenous Aquatic Species (NAS) database (http://nas.er.usgs.gov) functions as a national repository and clearinghouse for occurrence data for introduced species within the United States. Included is locality information on over 1,100 species of vertebrates, invertebrates, and vascular plants introduced as early as 1850. Taxa include foreign (exotic) species and species native to North America that have been transported outside of their natural range. Locality data are obtained from published and unpublished literature, state, federal and local monitoring programs, museum accessions, on-line databases, websites, professional communications and on-line reporting forms. The NAS web site provides immediate access to new occurrence records through a real-time interface with the NAS database. Visitors to the web site are presented with a set of pre-defined queries that generate lists of species according to state or hydrologic basin of interest. Fact sheets, distribution maps, and information on new occurrences are updated as new records and information become available. The NAS database allows resource managers to learn of new introductions reported in their region or nearby regions, improving response time. Conversely, managers are encouraged to report their observations of new occurrences to the NAS database so information can be disseminated to other managers, researchers, and the public. In May 2004, the NAS database incorporated an Alert System to notify registered users of new introductions as part of a national early detection/rapid response system. Users can register to receive alerts based on geographic or taxonomic criteria. The NAS database was used to identify 23 fish species introduced into the lower Tennessee and Cumberland drainages. Most of these are sport fish stocked to support fisheries, but the list also includes accidental and illegal introductions such as Asian Carps, clupeids, various species popular in the aquarium trade, and Atlantic Needlefish (Strongylura marina) that was introduced via the newly-constructed Tennessee-Tombigbee Canal.

Fuller, Pam; Cannister, Matthew

2013-01-01

478

Revitalizing HEC at NASA  

NASA Technical Reports Server (NTRS)

This talk will review the focus on NASA advances in SSI supercomputing technology over the last 4 years, the development of the worlds largest Origins. the development of the cooperative program that developed the CRAY and SGI system in FY03 and the efforts that led to the formulation and approval of the NAS program and Columbia Project. Finally a projection of the RBD and operations focus in HEC for the next 3-5 years will be described. (use NAS url)

Brooks, Walt

2005-01-01

479

Naphthenic acids affect plant water conductance but do not alter shoot Na + and Cl ? concentrations in jack pine ( Pinus banksiana ) seedlings  

Microsoft Academic Search

Solution culture-grown, six-month old jack pine (Pinus banksiana Lamb.) seedlings were treated with naphthenic acids (NAs) (150mgl-1) and sodium chloride (45mM NaCl) which were applied together or separately to roots for four weeks. NAs aggravated the effects of NaCl in inhibiting stomatal conductance (gs) and root hydraulic conductance (Kr). Naphthenic acids did not affect needle and root electrolyte leakage in

Kent G. Apostol; Janusz J. Zwiazek; Michael D. MacKinnon

2004-01-01

480

GUA DE BIOQUMICA PARTE I. ESTRUCTURA BIOLGICA Y QUMICA DE LAS PROTENAS  

E-print Network

GUÍA DE BIOQUÍMICA PARTE I. ESTRUCTURA BIOL?GICA Y QUÍMICA DE LAS PROTEÍNAS 1. CARACTERÍSTICAS elementos Químicos, 2. Los enlaces no covalentes son importantes en la estructura biológica, 3. Los estructuras mayores, 6. Las proteínas desempeñan una función central en los sistemas vivos. 2. AMINOÁCIDOS 1

481

TEMARIO PARA EL EXAMEN DE BIOQUMICA PARTE I. ESTRUCTURA BIOLGICA Y QUMICA DE LAS PROTENAS  

E-print Network

TEMARIO PARA EL EXAMEN DE BIOQUÍMICA PARTE I. ESTRUCTURA BIOL?GICA Y QUÍMICA DE LAS PROTEÍNAS 1 dieciséis elementos Químicos 2. Los enlaces no covalentes son importantes en la estructura biológica 3. Los estructuras mayores 6. Las proteínas desempeñan una función central en los sistemas vivos. 2. AMINOÁCIDOS 1

482

Investigation of Advanced Counterrotation Blade Configuration Concepts for High Speed Turboprop Systems. Task 8: Cooling Flow/heat Transfer Analysis User's Manual  

NASA Technical Reports Server (NTRS)

The focus of this task was to validate the ADPAC code for heat transfer calculations. To accomplish this goal, the ADPAC code was modified to allow for a Cartesian coordinate system capability and to add boundary conditions to handle spanwise periodicity and transpiration boundaries. This user's manual describes how to use the ADPAC code as developed in Task 5, NAS3-25270, including the modifications made to date in Tasks 7 and 8, NAS3-25270.

Hall, Edward J.; Topp, David A.; Heidegger, Nathan J.; Delaney, Robert A.

1994-01-01

483

Effects of 6-hydroxydopamine lesions of the nucleus accumbens septi and olfactory tubercle on feeding, locomotor activity, and amphetamine anorexia in the rat  

Microsoft Academic Search

In Exp I with 24 male albino Wistar rats, bilateral 6-hydroxydopamine lesions of the nucleus accumbens septi (NAS) and olfactory tubercle (OT) caused enhanced intake of wet mash in 23-hr-food-deprived Ss tested in photocell activity cages during restricted 30-min sessions. This mild hyperphagia was accompanied by a significant hypoactivity in the group with NAS\\/OT lesions. No hyperphagia was observed during

George F. Koob; Susan J. Riley; S. Christine Smith; Trevor W. Robbins

1978-01-01

484

Systems integration of Unmanned Aircraft into the National Airspace: Part of the Federal Aviation Administration Next Generation Air Transportation System  

Microsoft Academic Search

The United States Federal Aviation Administration (FAA) Next Generation Air Transportation System (NextGen) is a comprehensive, ongoing transformation of the U.S. National Airspace System (NAS). NextGen will fundamentally change NAS operations by implementing advanced technologies to monitor and operate aircraft. NextGen poses substantial systems integration challenges due to numerous technical, organizational, political, and social perspectives and their complex interdependencies. Specifically,

Ryan N. Van Dyk; Daniel H. Pariseau; Richard E. Dodson; Brendan T. Martin; Alexander T. Radcliffe; Eni A. Austin; Yacov Y. Haimes; Eva Andrijcic; Zhenyu Guo; Jin H. Werner

2012-01-01

485

Impact of polymeric membrane filtration of oil sands process water on organic compounds quantification.  

PubMed

The interaction between organic fractions in oil sands process-affected water (OSPW) and three polymeric membranes with varying hydrophilicity (nylon, polyvinylidene fluoride and polytetrafluoroethylene) at different pHs was studied to evaluate the impact of filtration on the quantification of acid-extractable fraction (AEF) and naphthenic acids (NAs). Four functional groups predominated in OSPW (amine, phosphoryl, carboxyl and hydroxyl) as indicated by the linear programming method. The nylon membranes were the most hydrophilic and exhibited the lowest AEF removal at pH of 8.7. However, the adsorption of AEF on the membranes increased as the pH of OSPW decreased due to hydrophobic interactions between the membrane surfaces and the protonated molecules. The use of ultra pressure liquid chromatography-high resolution mass spectrometry (UPLC/HRMS) showed insignificant adsorption of NAs on the tested membranes at pH 8.7. However, 26 2.4% adsorption of NAs was observed at pH 5.3 following the protonation of NAs species. For the nylon membrane, excessive carboxylic acids in the commercial NAs caused the formation of negatively charged assisted hydrogen bonds, resulting in increased adsorption at pH 8.2 (25%) as compared to OSPW (0%). The use of membranes for filtration of soluble compounds from complex oily wastewaters before quantification analysis of AEF and NAs should be examined prior to application. PMID:25225922

Moustafa, Ahmed M A; Kim, Eun-Sik; Alpatova, Alla; Sun, Nian; Smith, Scott; Kang, Seoktae; Gamal El-Din, Mohamed

2014-01-01

486

Advanced analytical mass spectrometric techniques and bioassays to characterize untreated and ozonated oil sands process-affected water.  

PubMed

Oil sands process-affected water (OSPW) is a toxic and poorly biodegradable mixture of sand, silt, heavy metals, and organics. In this study, qualitative and quantitative comparisons of naphthenic acids (NAs) were done using ultraperformance liquid chromatography time-of-flight mass spectrometry (UPLC TOF-MS), Fourier transform ion cyclotron resonance (FT-ICR) MS, and ion mobility spectrometry (IMS). The unique combination of these analyses allowed for the determination and correlation of NAs, oxidized NAs, and heteroatom (sulfur or nitrogen) NAs. Despite its lower resolution, UPLC-TOF MS was shown to offer a comparable level of reliability and precision as the high resolution FT-ICR MS. Additionally, the impacts of ozonation (35 mg/L utilized ozone dose) and subsequent NAs degradation on OSPW toxicity were assessed via a collection of organisms and toxicity end points using Vibrio fischeri (nonspecific), specific fish macrophage antimicrobial responses, and fish olfactory responses. Fish macrophages exposed to ozonated OSPW for 1 week showed higher production of reactive oxygen and nitrogen intermediates; however, after 12 weeks the responses were reduced significantly. Fish olfactory tests suggested that OSPW interfered with their perception of odorants. Current results indicate that the quantification of NAs species, using novel analytical methods, can be combined with various toxicity methods to assess the efficiency of OSPW treatment processes. PMID:25211339

Sun, Nian; Chelme-Ayala, Pamela; Klamerth, Nikolaus; McPhedran, Kerry N; Islam, Md Shahinoor; Perez-Estrada, Leonidas; Drzewicz, Przemys?aw; Blunt, Brian J; Reichert, Megan; Hagen, Mariel; Tierney, Keith B; Belosevic, Miodrag; Gamal El-Din, Mohamed

2014-10-01

487

Sequestration of naphthenic acids from aqueous solution using ?-cyclodextrin-based polyurethanes.  

PubMed

The sorption characteristics of naphthenic acids (NAs) in their anion form with ?-cyclodextrin (?-CD) based polyurethanes, as sorbents, from aqueous solutions that simulate the conditions of oil sands process water (OSPW) are presented. The copolymer sorbents were synthesized at various ?-CD:diisocyanate monomer mole ratios (e.g., 1:1, 1:2, and 1:3) with diisocyanates of variable molecular size and degree of unsaturation. The equilibrium sorption properties of the copolymer sorbents were characterized using sorption isotherms in aqueous solution at pH 9.00 with electrospray ionization mass spectrometry to monitor the equilibrium unbound fraction of anionic NAs in the aqueous phase. The copolymer sorbents were characterized in the solid state using (13)C CP-MAS NMR spectroscopy, IR spectroscopy and elemental analysis. The sorption results of the copolymer sorbents with anion forms of NAs in solution were compared with a commercially available carbonaceous standard: granular activated carbon (GAC). The monolayer sorption capacities of the sorbents (Q(m)) were obtained from either the Langmuir or the Sips isotherm model used to characterize the sorption characteristics of each copolymer sorbent. The estimated sorption capacity for GAC was 142 mg NAs per g sorbent whereas the polymeric materials ranged from 0-75 mg NAs per g sorbent over the experimental conditions investigated. In general, significant differences in the sorption capacities between GAC and the copolymer sorbents were related to the differences in the accessible surface areas and pore structure characteristics of the sorbents. The Sips parameter (K(eq)) for GAC and the copolymer materials reveal differences in the relative binding affinity of NAs to the sorbent framework in accordance with the synthetic ratios and the value of Q(m). The diisocyanate linker plays a secondary role in the sorption mechanism, whereas the ?-CD macrocycle in the copolymer framework is the main sorption site for NAs because of the formation of inclusion complexes with ?-CD. PMID:21076742

Mohamed, Mohamed H; Wilson, Lee D; Headley, John V; Peru, Kerry M

2011-01-21

488

Sodium-sulfur battery flight experiment definition study  

NASA Astrophysics Data System (ADS)

The need for high power space systems in anticipated within the next 10 to 20 years. Examples are the Space Station, co-orbiting platforms, geostationary orbit (GEO) platforms, and space-based radar satellites and some classified high power missions. Sodium-sulfur (Na?S) batteries have been identified as the most likely successor to nickel-hydrogen (Ni?H 2) batteries for space applications. One advantage of the Na?S battery system is that the useable specific energy is two to three times that of Ni?H 2 batteries. This represents significant launch cost savings or increased payload mass capabilities. Na?S batteries support NASA OAST's proposed Civil Space Technology Initiative goal of a factor of two improvement in spacecraft power system performance, as well as the proposed Spacecraft 2000 initiative. The Na?S battery operates at between 300 and 400 C, using liquid sodium and sulfur/polysulfide electrodes and solid ceramic electrolyte [1 - 3]. The transport of the electrode materials to the surface of the electrolyte is through wicking/capillary forces. These critical transport functions must be demonstrated under actual microgravity conditions before Na?S batteries can be confidently utilized in space. For Aerospace Corporation, under contract to NASA Lewis Research Center, is currently working on the Na?S battery space flight experiment definition study. The objective is to design the experiment that will demonstrate operation of the Na?S battery/cell in the space environment, with particular emphasis on evaluation of microgravity effects. Experimental payload definitions have been completed and preliminary designs of the experiment have been defined.

Chang, Rebecca; Minck, Robert

489

The effect of oil sands process-affected water and naphthenic acids on the germination and development of Arabidopsis.  

PubMed

Oil sands mining in the Athabasca region of northern Alberta results in the production of large volumes of oil sands process-affected water (OSPW). We have evaluated the effects of OSPW, the acid extractable organic (AEO) fraction of OSPW, and individual naphthenic acids (NAs) on the germination and development of the model plant, Arabidopsis thaliana (Arabidopsis). The surrogate NAs that were selected for this study were petroleum NAs that have been used in previous toxicology studies and may not represent OSPW NAs. A tricyclic diamondoid NA that was recently identified as a component of OSPW served as a model NA in this study. Germination of Arabidopsis seeds was not inhibited when grown on medium containing up to 75% OSPW or by 50mgL(-1) AEO. However, simultaneous exposure to three simple, single-ringed surrogate NAs or a double-ringed surrogate NA had an inhibitory effect on germination at a concentration of 10mgL(-1), whereas inhibition of germination by the diamondoid model NA was observed only at 50mgL(-1). Seedling root growth was impaired by treatment with low concentrations of OSPW, and exposure to higher concentrations of OSPW resulted in increased growth inhibition of roots and primary leaves, and caused bleaching of cotyledons. Treatment with single- or double-ringed surrogate NAs at 10mgL(-1) severely impaired seedling growth. AEO or diamondoid NA treatment was less toxic, but resulted in severely impaired growth at 50mgL(-1). At low NA concentrations there was occasionally a stimulatory effect on root and shoot growth, possibly owing to the broad structural similarity of some NAs to known plant growth regulators such as auxins. This report provides a foundation for future studies aimed at using Arabidopsis as a biosensor for toxicity and to identify genes with possible roles in NA phytoremediation. PMID:23746390

Leishman, Chelsea; Widdup, Ellen E; Quesnel, Dean M; Chua, Gordon; Gieg, Lisa M; Samuel, Marcus A; Muench, Douglas G

2013-09-01

490

Colonization of wheat roots by an exopolysaccharide-producing pantoea agglomerans strain and its effect on rhizosphere soil aggregation  

PubMed

The effect of bacterial secretion of an exopolysaccharide (EPS) on rhizosphere soil physical properties was investigated by inoculating strain NAS206, which was isolated from the rhizosphere of wheat (Triticum durum L.) growing in a Moroccan vertisol and was identified as Pantoea aglomerans. Phenotypic identification of this strain with the Biotype-100 system was confirmed by amplified ribosomal DNA restriction analysis. After inoculation of wheat seedlings with strain NAS206, colonization increased at the rhizoplane and in root-adhering soil (RAS) but not in bulk soil. Colonization further increased under relatively dry conditions (20% soil water content; matric potential, -0.55 MPa). By means of genetic fingerprinting using enterobacterial repetitive intergenic consensus PCR, we were able to verify that colonies counted as strain NAS206 on agar plates descended from inoculated strain NAS206. The intense colonization of the wheat rhizosphere by these EPS-producing bacteria was associated with significant soil aggregation, as shown by increased ratios of RAS dry mass to root tissue (RT) dry mass (RAS/RT) and the improved water stability of adhering soil aggregates. The maximum effect of strain NAS206 on both the RAS/RT ratio and aggregate stability was measured at 24% average soil water content (matric potential, -0.20 MPa). Inoculated strain NAS206 improved RAS macroporosity (pore diameter, 10 to 30 &mgr;m) compared to the noninoculated control, particularly when the soil was nearly water saturated (matric potential, -0.05 MPa). Our results suggest that P. agglomerans NAS206 can play an important role in the regulation of the water content (excess or deficit) of the rhizosphere of wheat by improving soil aggregation. PMID:9758793

Amellal; Burtin; Bartoli; Heulin

1998-10-01

491

cDNA cloning and functional analysis of the p97 subunit of the 26S proteasome, a polypeptide identical to the type-1 tumor-necrosis-factor-receptor-associated protein-2/55.11.  

PubMed

Molecular cloning of cDNA for a new regulatory subunit, designated p97, of the human 26S proteasome showed that the polypeptide consists of 908 amino acid residues with a calculated molecular mass of 100184 Da and an isoelectric point of 4.94. Computer analysis showed that p97 is very similar to type-1 tumor-necrosis-factor (TNF)-receptor-associated protein (TRAP)-2 and 55.11, both of which were identified recently as binding proteins of the cytoplasmic domain of type-1 TNF receptor by yeast two-hybrid screening. This finding suggests that the 26S proteasome might serve as a mediator molecule in the TNF signaling pathway in cells. Computer-assisted similarity analysis also revealed the high sequence similarity of p97 with a yeast protein whose function is yet unknown, the gene for which is here termed NAS1 (non-ATPase subunit 1). Disruption of NAS1 resulted in several phenotypes, including lethality and temperature-sensitive growth, depending on the genetic background of the cells used. The human p97 cDNA suppressed the growth defect of nas1 disruptant cells, when expressed from single-copy or multi-copy vectors, indicating that p97 is functionally equivalent to yeast Nas1p. Culturing of the temperature-sensitive nas1 cells at the restrictive temperature promoted the accumulation polyubiquitinated cellular proteins, implying that the 26S proteasome requires a functional Nas1p subunit for ubiquitin-dependent proteolysis. These results indicate that p97/Nas1p plays an important regulatory role in the function of the 26S proteasome. PMID:8774743

Tsurumi, C; Shimizu, Y; Saeki, M; Kato, S; Demartino, G N; Slaughter, C A; Fujimuro, M; Yokosawa, H; Yamasaki, M; Hendil, K B; Toh-e, A; Tanahashi, N; Tanaka, K

1996-08-01

492

Conocimientos y autoeficacia asociados a la prevenci?n del VIH y SIDA en mujeres chilenas  

PubMed Central

Resumen Objetivo Evaluar la relacin existente entre conocimientos y autoeficacia asociados al VIH/SIDA en mujeres chilenas en desventaja social. Metodologa Estudio correlacional, que utiliza la medicin basal del estudio Testeando una intervencin en VIH y SIDA en mujeres chilenas, realizada entre 2006 y 2008, que tiene una muestra de 496 mujeres entre 18 y 49 aos residentes en dos comunas de Santiago de Chile. Las participantes respondieron un cuestionario estructurado aplicado por entrevistadoras entrenadas. Este cuestionario incluy preguntas sobre datos sociodemogrficos, escala de conocimientos de conductas de riesgo y autoeficacia, entre otros. Resultados Edad promedio de 32.39.1 aos, 72.2% vive con su pareja y 42.7% poseen educacin media completa. La puntuacin media de los conocimientos de la infeccin por el VIH fue de 8.92.5, mientras que para las tres escalas empleadas para medir autoeficacia fueron: Normas de los pares =9.83.6, Intencin de reducir conductas de riesgo =12.23.6 y Self Efficacy Form=20.24.7. Los conocimientos tuvieron una correlacin positiva dbil con la intencin de reducir conductas de riesgo (r=0.19; p<0.0001) y con la escala Self Efficacy Form (r=0.34; p<0.0001), pero no se relacionaron con las normas de los pares en cuanto a relaciones sexuales seguras (r=0.13; p=0.78). Conclusin Existe una dbil correlacin positiva entre el nivel de conocimientos sobre el VIH/SIDA y la autoeficacia en mujeres chilenas en desventaja social.

Villegas Rodriguez, Natalia; Ferrer Lagunas, Lilian Marcela; Cianelli Acosta, Rosina; Miner, Sarah; Lara Campos, Loreto; Peragallo, Nilda

2014-01-01

493

Network of Environmental Sensors in Tropical Rain Forests  

NASA Astrophysics Data System (ADS)

The interaction between the Earths atmosphere and the terrestrial biosphere plays a fundamental role in the climate system and in biogeochemical and hydrological cycles, through the exchange of energy and mass (for example, water and carbon), between the vegetation and the atmospheric boundary layer, and the main focus of many environmental studies is to quantify this exchange over several terrestrial biomes. Over natural surfaces like the tropical forests, factors like spatial variations in topography or in the vegetation cover can significantly affect the air flow and pose big challenges for the monitoring of the regional carbon budget of terrestrial biomes. It is hardly possible to understand the air flow and reduce the uncertainties of flux measurements in complex terrains like tropical forests without an approach that recognizes the complexity of the spatial variability of the environmental variables. With this motivation, a partnership involving Microsoft Research, Johns Hopkins University, University of So Paulo and Instituto Nacional de Pesquisas Espaciais (INPE, the Brazilian national institute for space research) has been developing research activities to test the use of prototypes of environmental sensors (geosensors) in the Atlantic coastal and in the Amazonian rain forests in Brazil, forming sensor networks with high spatial and temporal resolution, and to develop software tools for data quality control and integration. The main premise is that the geosensors should have relatively low cost, what enables the formation of monitoring networks with a large number of sensors spatially distributed. A pilot study deployed 200+ sensors over the Atlantic coastal forest in Sao Paulo state, Brazil. Here we present the results from this study, highlighting the current discussions on applications of this type of measurements in studies of biosphere-atmosphere interaction in the tropics. Envisioning a possible wide deployment of geosensors in Amazonia in the future, the team is currently working on three main components: 1) assembly and calibration of prototypes of geosensors of air temperature and humidity, with reproductive and reliable ceramic sensor elements that will adequately operate under the environmental conditions observed in the tropics; 2) development of software tools for management, quality control, visualization and integration of data collected in geosensor networks; and 3) planning of the Amazon experimental campaign, with the installation of the first tens to hundreds of sensors within and above the rainforest canopy, aiming at a test of the system to study the spatial variability of temperature and humidity.

von Randow, C.; Dos Santos, R. D.; Da Rocha, H.

2010-12-01

494

Annotations on Mexico's WISC-IV: a validity study.  

PubMed

This project seeks to provide evidence on the internal structure of the Escala Wechsler de Inteligencia para Nios-IV (EWIN-IV; Wechsler, 2007a ) through a confirmatory factor analysis and intercorrelational study. Also provided is information on the adaptation process and other sources of validity evidence in support of the EWIN-IV norms. The standardization data for the EWIN-IV were used for all analyses. The factor loadings and correlational patterns found on the EWIN-IV are comparable to those seen in the American versions of the test. The proposed factor and scoring structure of the EWIN-IV was supported. PMID:23428273

Fina, Anthony D; Snchez-Escobedo, Pedro; Hollingworth, Liz

2012-01-01

495

El teatro indgena y campesino  

E-print Network

. Los das de la espera Desde Bolvar, una poblacin rural y lejana del Departamento de Santander del Sur, con escasos 30 mil habitantes, surgi a escala nacional el grupo Horizontes de Juventud. La obra presentada fue Los das de la espera o la... espera de los das y plantea el modo de vida de los campesinos de aquellas lejanas regiones. Pero tambin es la vida del campesino colombiano en general. Lo ms significativo del grupo es que sus integrantes son los propios campesinos que cuentan sus...

Jaraba, Enisberto

1977-10-01

496

Spirituality and Cultural Identification Among Latino and Non-Latino College Students  

PubMed Central

The purposes of this study were to examine (a) differences in spiritual perspectives and practices of Latino and non-Latino young adults and (b) the cultural relevance of the Latino Spiritual Perspective Scale (LSPS). Studies indicate that spiritual perspectives are embedded within cultural group norms and vary significantly across ethnic groups. A cross-sectional survey design was used with a convenience sample of 223 Latino and non-Latino university students in the Southwestern United States. The Spiritual Perspective Scale (SPS), the LSPS, the Orthogonal Cultural Identification Scale, and a demographic questionnaire were used. Latinos scored significantly higher than non-Latinos in both measures of spiritual perspectives. Self-reported behavioral measures, such as frequency of personal prayer, were also higher among the Latino group. Latino cultural identification was the only significant predictor of LSPS scores. Findings from this study indicate that spirituality among Latinos has meanings specific to the cultural group context. These findings have implications for nursing research involving the conceptualization and measurement of spirituality among multiethnic groups. Los propsitos de este estudio eran examinar: (a) diferencias en perspectivas espirituales y prcticas de jvenes Latinos y no Latinos; y (b) la relevancia cultural de la Escala de la Perspectiva Espiritual Latina. Estudios indican que perspectivas espirituales estn incrustadas entre normas culturales del grupo y varan considerablemente entre grupos tnicos. Un diseo transversal y de encuesta fue utilizado con una muestra de conveniencia de 233 estudiantes universitarios Latinos y no Latinos en el Suroeste de los Estados Unidos. La Escala de la Perspectiva Espiritual (EPE), la Escala de la Perspectiva Espiritual Latina (EPEL), la Escala Ortogonal de Identificacin Cultural, y un cuestionario demogrfico fueron utilizados. Los Latinos calificaron considerablemente ms alto que los no Latinos en ambas medidas de perspectivas espirituales. Medidas de comportamiento auto-reportadas, como la frecuencia de oracin, tambin estuvieron ms altas en el grupo Latino. La identificacin con la cultura Latina fue el nico vaticinador de las calificaciones de la EPEL. Los resultados de este estudio indican que la espiritualidad entre Latinos tiene significados especficos al contexto del grupo cultural. Estas conclusiones tienen implicaciones para las investigaciones de enfermera que involucran la conceptualizacin y medida de la espiritualidad entre grupos multitnicos. PMID:20165566

Campesino, Maureen; Belyea, Michael; Schwartz, Gary

2010-01-01

497

Elevated Nicotianamine Levels in Arabidopsis halleri Roots Play a Key Role in Zinc Hyperaccumulation[W  

PubMed Central

Zn deficiency is among the leading health risk factors in developing countries. Breeding of Zn-enriched crops is expected to be facilitated by molecular dissection of plant Zn hyperaccumulation (i.e., the ability of certain plants to accumulate Zn to levels >100-fold higher than normal plants). The model hyperaccumulators Arabidopsis halleri and Noccaea caerulescens share elevated nicotianamine synthase (NAS) expression relative to nonaccumulators among a core of alterations in metal homeostasis. Suppression of Ah-NAS2 by RNA interference (RNAi) resulted in strongly reduced root nicotianamine (NA) accumulation and a concomitant decrease in root-to-shoot translocation of Zn. Speciation analysis by size-exclusion chromatography coupled to inductively coupled plasma mass spectrometry showed that the dominating Zn ligands in roots were NA and thiols. In NAS2-RNAi plants, a marked increase in Zn-thiol species was observed. Wild-type A. halleri plants cultivated on their native soil showed elemental profiles very similar to those found in field samples. Leaf Zn concentrations in NAS2-RNAi lines, however, did not reach the Zn hyperaccumulation threshold. Leaf Cd accumulation was also significantly reduced. These results demonstrate a role for NAS2 in Zn hyperaccumulation also under near-natural conditions. We propose that NA forms complexes with Zn(II) in root cells and facilitates symplastic passage of Zn(II) toward the xylem. PMID:22374395

Deinlein, Ulrich; Weber, Michael; Schmidt, Holger; Rensch, Stefan; Trampczynska, Aleksandra; Hansen, Thomas H.; Husted, S?ren; Schjoerring, Jan K.; Talke, Ina N.; Kramer, Ute; Clemens, Stephan

2012-01-01

498

Emergence of opiate-induced neonatal abstinence syndrome.  

PubMed

Neonatal abstinence syndrome (NAS) is the clinical picture of infants withdrawing from in-utero substance exposure. The incidence of NAS rose in Dublin maternity hospitals in the 1970's and '80's in parallel with increasing in opiate abuse in that city. The purpose of this study was to determine if a similar pattern was emerging in Cork University Maternity Hospital. Data from the Erinville Hospital (2000-2007) and CUMH (2008-2011) were compared. Sixteen cases of NAS were identified, two at Erinville Hospital (22,987 deliveries; incidence = 0.09/1000 deliveries) and 14 at CUMH (37,414 deliveries; incidence = 0.38/1000 deliveries; p < 0.01). Five of the 16 mothers were using heroin, while ten were on methadone maintenance. All were multi-drug abusers. Newborns requiring pharmacotherapy for NAS (5/16) had prolonged hospitalisations compared to those requiring supportive care. NAS in Cork is increasing. Primary, secondary and tertiary preventative measures are warranted to prevent further escalation. PMID:24654482

Healy, D; English, F; Daniels, A; Ryan, C A

2014-02-01

499

Physiological effects and tissue residues from exposure of leopard frogs to commercial naphthenic acids.  

PubMed

Naphthenic acids (NAs) have been cited as one of the main causes of the toxicity related to oil sands process-affected materials and have recently been measured in biological tissues (fish). However, adverse effects have not been a consistent finding in toxicology studies on vertebrates. This study set out to determine two factors: 1) whether exposure to commercial NAs (Refined Merichem) resulted in detectable tissue residues in native amphibians (northern leopard frogs, Lithobates pipiens), and 2) whether such exposure would produce clinical or subclinical toxicity. Frogs were kept in NA solutions (0, 20, or 40 mg/L) under saline conditions comparable to that on reclaimed wetlands in the Athabasca oil sands for 28 days. These exposures resulted in proportional NA concentrations in muscle tissue of the frogs, estimated by gas chromatography-mass spectrometry analyses. Detailed studies determined if the increasing concentrations of NAs, and subsequently increased tissue NA levels, caused a proportional compromise in the health of the experimental animals. Physiological investigations included innate immune function, thyroid hormone levels, and hepatic detoxification enzyme induction, none of which differed in response to increased exposures or tissue concentrations of NAs. Body mass did increase in both the salt- and NA-exposed animals, likely related to osmotic pressure and uptake of water through the skin. Our results demonstrate that commercial NAs are absorbed and deposited in muscle tissue, yet they show few negative physiological or toxicological effects on the frogs. PMID:22903002

Smits, Judit E G; Hersikorn, Blair D; Young, Rozlyn F; Fedorak, Phillip M

2012-10-15