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1

Obtencao de parametros dinamicos de um reator nuclear atraves da tecnica de malha adaptativa. (Obtainment of nuclear power plant dynamic parameters by adaptive mesh technique).  

National Technical Information Service (NTIS)

This thesis involves the problem in determination of the parameters of the Mathematical Model of a Nuclear Reactor, including non-linearity which is considered as a bi-linear system. Being a non-linear model, the determination of its parameters cannot be ...

W. Carvalho Miranda

1979-01-01

2

Seguranca radiologica no uso de tecnicas nucleares -atividades desenvolvidas pelo Centro de Desenvolvimento da Tecnologia Nuclear - CNEN. (Radiological safety in the use of nuclear technique-activities developed by Centro de Desenvolvimento da Tecnologia Nuclear - CNEN).  

National Technical Information Service (NTIS)

The activities developed by the Centro de Desenvolvimento da Tecnologia Nuclear - CDTN supporting the users of nuclear techniques are described. The methodology used and future plans for the group are shown. (E.G.). (Atomindex citation 22:055424)

T. Wakabayashi E. G. Pereira T. Hirayama

1991-01-01

3

Faculty Activity Analysis in the Universidad Tecnica Del Estado Campuses.  

ERIC Educational Resources Information Center

An analysis of academic activities of college faculty at the eight campuses of Chile's Universidad Tecnica del Estado was conducted. Activities were grouped into seven categories: direct teaching, indirect teaching, research, community services, faculty development, academic administration, and other activities. Following the narrative…

Karadima, Oscar

4

Constru»c~ao de codigos geometricamente uniformes utilizando tecnicas multin¶‡veis  

Microsoft Academic Search

Tecnicas convencionais de codiflca»c~ao de canal podem melhorar o desempenho de um sistema de comunica»c~ao sacriflcando a ocupa»c~ao de faixa es- pectral ou a taxa de transmiss~ao de informa»c~ao. Imai e Hirakawa sugeriram em (1) uma tecnica de codiflca»c~ao multin¶‡vel que utiliza varios codigos binarios de bloco para construir sistemas efl- cientes em largura de faixa. Recentemente, foi mostrado em

J. Portugheis; S. I. R. Costa; D. C. da Cunha; R. M. de Siqueira; J. Bali; B. S. Rajan; Block-coded PSK

5

El miedo a la amenaza nuclear y las obras de protección civil en Suiza  

Microsoft Academic Search

Las obras de protección civil en Suiza representan no sólo una forma de actuar en el ámbito de la protección de la población, sino también un enorme gasto financiero para el Estado y, en definitiva, para todos los ciudadanos que las financian a través de los impuestos o pagando directamente las nuevas obras. Las locuras cometidas en este ámbito a

Marc Kaenzig

2007-01-01

6

OSSERVAZIONE CON TECNICA E.S.P.I. DEL COMPORTAMENTO A COMPRESSIONE DI MATERIALI QUASI-FRAGILI  

Microsoft Academic Search

Oggetto di questo lavoro è il perfezionamento di una tecnica interferometrica a luce laser E.S.P.I. per lo studio del comportamento a compressione di materiali quasi-fragili. Per lo sviluppo del sistema E.S.P.I. sono state effettuate prove di compressione su campioni prismatici in gasbeton, un particolare conglomerato aerato. Per misurare gli spostamenti verticali della superficie dei campioni, il setup E.S.P.I. è stato

Eva Coïsson; Daniele Ferretti

7

Assessment of the impact of a nuclear waste repository at Yucca Mountain on the economic development potential of Las Vegas, Clark County, and the surrounding area  

SciTech Connect

Growth Strategies Organization has completed an assessment of the Las Vegas MSA`s competitiveness in the attraction of new business facilities to the area. That report found that under current business climate conditions and in the present economic development market place, the region is a competitive site for about one hundred of the six hundred types of primary businesses studied. It is almost competitive as a location for another 80 to 90 types of businesses and is a marginal choice for another 200 business groups. In other words, Clark County, as is, fully satisfies the basic requirements of almost a sixth of the businesses in this study. With minor improvements in areas such as the skill mix of its work force and the quality of its educational facilities and with an effective campaign to improve the area`s image, the Las Vegas area could become a competitive location for about two-thirds of all business groups -- a very large shift in marketability. The proposed nuclear waste repository that he Federal government has proposed for siting at Yucca Mountain more than a hundred miles from Las Vegas would become operational after the turn of the century, more than fifteen years from now. Its influence on business investment decisions would be felt in the mid- to late-1990s if the final decision were made and announced. To measure that impact it would be desirable to establish a baseline that reflects Clark County`s competitiveness as a business facility location in the middle of the next decade. In constructing that baseline, several variables could be considered -- changes in business climate conditions in the area other than the nuclear waste repository; and changes in the location decision process itself resulting from changes in technology and in market pressures.

Boyle, M.R. [Growth Strategies Organization, Reston, VA (USA)

1989-01-01

8

High-level nuclear waste transport and storage assessment of potential impacts on tourism in the Las Vegas area. Nevada Nuclear Waste Storage Investigations Project  

SciTech Connect

The literature review and empirical analyses presented in this report were undertaken, for the most part, between August and October 1983. They are not comprehensive. No primary data were gathered, nor were any formal surveys conducted. Additionally, because construction of a repository at Yucca Mountain, if that site is selected for a repository, is not scheduled to begin until 1993, engineering design and planned physical appearance of the repository are very preliminary. Therefore, specific design features or visual appearance were not addressed in the analyses. Finally, because actual transportation routes have not been designated, impacts on tourism generated specifically by transportation activities are not considered separately. Chapter 2 briefly discusses possible means by which a repository could impact tourism in the Las Vegas area. Chapter 3 presents a review of previous research on alternative methods for predicting the response of people to potential hazards. A review of several published studies where these methods have been applied to facilities and activities associated with radioactive materials is included in Chapter 3. Chapter 4 contains five case studies of tourism impacts associated with past events that were perceived by the public to represent safety hazards. These perceptions of safety hazards were evidenced by news media coverage. These case studies were conducted specifically for this report. Conclusions of this preliminary analysis regarding the potential impact on tourism in the Las Vegas area of a repository at Yucca Mountain are in Chapter 5. Recommendations for further research are contained in Chapter 6.

NONE

1985-12-01

9

Calculo de las dosis de radiacion debidas a las descargas rutinarias de desechos liquidos de la central nucleoelectrica de Laguna Verde. (Calculating radiation doses in routine unloadings of liquid wastes from Laguna Verde nuclear power plant).  

National Technical Information Service (NTIS)

Utilization of nuclear energy to generate electricity is increasingly being used to replace fossil fuels. During operation of nuclear power plants, radioactive materials are produced, a small fraction of which are released to environment as liquid or gase...

G. Molina

1985-01-01

10

Las Vegas  

NASA Technical Reports Server (NTRS)

This image of Las Vegas, NV was acquired on August, 2000 and covers an area 42 km (25 miles) wide and 30 km (18 miles) long. The image displays three bands of the reflected visible and infrared wavelength region, with a spatial resolution of 15 m. McCarran International Airport to the south and Nellis Air Force Base to the NE are the two major airports visible. Golf courses appear as bright red areas of worms. The first settlement in Las Vegas (which is Spanish for The Meadows) was recorded back in the early 1850s when the Mormon church, headed by Brigham Young, sent a mission of 30 men to construct a fort and teach agriculture to the Indians. Las Vegas became a city in 1905 when the railroad announced this city was to be a major division point. Prior to legalized gambling in 1931, Las Vegas was developing as an agricultural area. Las Vegas' fame as a resort area became prominent after World War II. The image is located at 36.1 degrees north latitude and 115.1 degrees west longitude.

The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

2001-01-01

11

Nuclear  

NSDL National Science Digital Library

What part does nuclear energy play in satisfying energy demands? This informational piece, part of a series about the future of energy, introduces students to the uranium atom as an energy source. Here students read about the history of nuclear energy, how energy is derived from uranium, and benefits of nuclear energy. Information is also provided about limitations, particularly disposal problems and radioactivity, and geographical considerations of nuclear power in the United States. Thought-provoking questions afford students chances to reflect on what they've read about the uses of nuclear power. Articles and information on new nuclear plant design and nuclear accidents are available from a sidebar. Five energy-related PBS NewsHour links are provided. A web link to the U.S. Nuclear Regulatory Commission is included. Copyright 2005 Eisenhower National Clearinghouse

Project, Iowa P.

2004-01-01

12

Assessment of the impact of a nuclear waste repository at Yucca Mountain on the economic development potential of Las Vegas, Clark County, and the surrounding area  

Microsoft Academic Search

Growth Strategies Organization has completed an assessment of the Las Vegas MSA`s competitiveness in the attraction of new business facilities to the area. That report found that under current business climate conditions and in the present economic development market place, the region is a competitive site for about one hundred of the six hundred types of primary businesses studied. It

Boyle

1989-01-01

13

Informacion sobre el estudio de factibilidad para el reracking en las instalaciones de piscinas de la Central Electronuclear de Juragua. (Information on the feasibility study for the reracking in the fuel storage pools of the Juragua Nuclear Power Plant).  

National Technical Information Service (NTIS)

During 1993, in the Juragua Nuclear Power Plants as engineering evaluation programme was initiated in the storage area of irradiated nuclear fuel, where work in order to determine the feasibility of capacity increase for storage of irradiated nuclear fuel...

J. M. Rodriguez I. Rodriguez D. Lopez R. Guerra M. Rodriguez

1995-01-01

14

Obtencion de deposiciones finas mediante la tecnica de evaporacion al vacio. (Obtention of thin depositions by the vacuum evaporation technique).  

National Technical Information Service (NTIS)

The vacuum evaporating technique used to prepare thin depositions, and the technical characteristics of the constructed installation are described. (sup 235)U y (sup 238)U nuclear target for the fission researches were obtained. Aluminium and gold self-su...

D. Gonzalez Mateu A. Labrada A. Voronin

1991-01-01

15

Las Vegas: An Unconventional History  

NSDL National Science Digital Library

As part of the PBS series American Experience, this well-designed siteexplores the history and idiosyncrasies of Las Vegas. The film, andaccompanying book, which the web site is based on will both be availablethis fall (the film airs in November on PBS), and the site certainlywhets viewers appetites for both. A nice range of information iscovered on the site which includes everything from information aboutNevada's nuclear testing in the fifties, to Rat Pack reminiscences and ofcourse, wedding photos. If you'd like to share your own Vegas weddingtale there is an interactive portion of the site dedicated to the topic.Packed with time lines, a teacher's guide, maps and much more this site(and film and book by the same name) are worthy of attention.

2005-01-01

16

Las Vegas Strip History  

NSDL National Science Digital Library

Created by amateur cultural historian Deanna DeMatteo, this site offers "the most detailed history of the Las Vegas Strip on the Internet today," showing in words and graphics the evolution of the properties on the Strip from its beginning to the present. Drawing on materials provided by publications, professional Las Vegas historians, and the Nevada State Museum and Historical Society, DeMatteo offers a detailed, noncommercial history with plenty of photographs (many archival) of the strip from the first night club in 1930 named Pair O Dice to the first true casino hotel, El Rancho with 63 rooms in 1941, to Hilton's giant Paris Las Vegas opening earlier this Fall with 2,914 rooms. There is also a special topics section, covering people significant in the strip's development, such as Warren "Doc" Bayley and Howard Hughes. Launched in August, the Website is continually updated with new material. Note: to reach table of contents, click on the photograph at end of the homepage.

Dematteo, Deanna.

17

Radioxenon Atmospheric Measurements in North Las Vegas  

SciTech Connect

Pacific Northwest National Laboratory (PNNL) deployed the Automated Radioxenon Sampler/Analyzer (ARSA) in North Las Vegas for two weeks in February and March 2006 for the purpose of measuring the radioxenon background at a level of sensitivity much higher than previously done in the vicinity of the Nevada Test Site (NTS). The measurements establish what might be expected if future measurements are taken at NTS itself and investigate improved methods of environmental monitoring of NTS for test site readiness. Also, such radioxenon measurements have not previously been performed in a United States location considered to be as remote from nuclear reactors. A second detector, the Portable Environmental Monitoring Station (PEMS), built and operated by the Desert Research Institute (DRI), was deployed in conjunction with the ARSA and contained a pressure ion chamber, aerosol collection filters, and meteorological sensors. Some of the radioxenon measurements detected 133Xe at levels up to 3 mBq/m3. This concentration of radioxenon is consistent with the observation of low levels of radioxenon emanating from distance nuclear reactors. Previous measurements in areas of high nuclear reactor concentration have shown similar results, but the western US, in general, does not have many nuclear reactors. Measurements of the wind direction indicate that the air carrying the radioxenon came from south of the detector and not from the NTS.

Milbrath, Brian D.; Cooper, Matthew W.; Lidey, Lance S.; Bowyer, Ted W.; Hayes, James C.; McIntyre, Justin I.; Karr, L.; Shafer, David S.; Tappen, J.

2007-09-25

18

EMPACT: THE LAS VEGAS INTERAGENCY PILOT PROGRAM  

EPA Science Inventory

ENPACT: The Las Vegas Interagency Pilot Project The Las Vegas Interagency Pilot Project of the EMPACT program has involved eleven efforts. These efforts are described in brief on the poster presentation. They include: Las Vegas Environmental Monitoring Inventory, the Qual...

19

Nuclear Medicine  

MedlinePLUS

Nuclear Medicine What is nuclear medicine? What are radioactive tracers? What is Single Photon Emission Computed Tomography (SPECT)? What ... funded researchers advancing nuclear medicine? What is nuclear medicine? Nuclear medicine is a medical specialty that uses ...

20

Seismic Data for Evaluation of Ground Motion Hazards in Las Vegas in Support of Test Site Readiness Ground Motion  

SciTech Connect

In this report we describe the data sets used to evaluate ground motion hazards in Las Vegas from nuclear tests at the Nevada Test Site. This analysis is presented in Rodgers et al. (2005, 2006) and includes 13 nuclear explosions recorded at the John Blume and Associates network, the Little Skull Mountain earthquake and a temporary deployment of broadband station in Las Vegas. The data are available in SAC format on CD-ROM as an appendix to this report.

Rodgers, A

2008-01-16

21

Nuclear Medicine.  

ERIC Educational Resources Information Center

Describes the use of nuclear medicine techniques in diagnosis and therapy. Describes instrumentation in diagnostic nuclear medicine and predicts future trends in nuclear medicine imaging technology. (Author/MM)

Badawi, Ramsey D.

2001-01-01

22

On the design of LAS spreading codes  

Microsoft Academic Search

A family of large area synchronised (LAS) codes is studied, which exhibits a so-called interference free window (IFW), where both the intersymbol interference (ISI) and the multiple user interference (MAI) are suppressed, provided that the relative time offset of the codes is within the IFW. Hence, LAS codes have the potential of increasing the capacity of CDMA networks. However, a

Byoung-Jo Choi; Lajos Hanzo

2002-01-01

23

Nuclear Power  

NSDL National Science Digital Library

An introduction to nuclear fission, its controlled release in power stations, problems of nuclear waste, and nuclear accidents. A linked web page discusses nuclear weapons, their effect, their ban, and "dirty bombs". This material supplements a previous section on fission in the Sun and the curve of binding energy in "From Stargazers to Starships". A French translation also exists.

Stern, David

2004-11-28

24

Nuclear Chemistry.  

ERIC Educational Resources Information Center

Provides a brief review of the latest developments in nuclear chemistry. Nuclear research today is directed toward increased activity in radiopharmaceuticals and formation of new isotopes by high-energy, heavy-ion collisions. (Author/BB)

Chemical and Engineering News, 1979

1979-01-01

25

Nuclear ventriculography  

MedlinePLUS

... Radionuclide ventriculography (RNV); Multiple gate acquisition scan (MUGA); Nuclear cardiology ... Nuclear imaging tests carry a very low risk of complications. Exposure to the radioisotope delivers a small amount of ...

26

Nuclear Scans  

MedlinePLUS

Nuclear scans use radioactive substances to see structures and functions inside your body. They use a special ... images. Most scans take 20 to 45 minutes. Nuclear scans can help doctors diagnose many conditions, including ...

27

Nuclear safety  

Microsoft Academic Search

The debate over nuclear power in the U.S. finds critics contending that the country should undertake a strict program of energy conservation coupled with an accelerated effort to develop new energy sources. Nuclear advocates would proceed rapidly with widespread construction of nuclear power plants to provide national electric power supplies. The debate is discussed under the following topics: new role

Hamer

1975-01-01

28

Nuclear Fuels.  

ERIC Educational Resources Information Center

Trends in and factors related to the nuclear industry and nuclear fuel production are discussed. Topics addressed include nuclear reactors, survival of the U.S. uranium industry, production costs, budget cuts by the Department of Energy and U.S. Geological survey for resource studies, mining, and research/development activities. (JN)

Nash, J. Thomas

1983-01-01

29

Nuclear weapons, nuclear effects, nuclear war  

SciTech Connect

This paper provides a brief and mostly non-technical description of the militarily important features of nuclear weapons, of the physical phenomena associated with individual explosions, and of the expected or possible results of the use of many weapons in a nuclear war. Most emphasis is on the effects of so-called ``strategic exchanges.``

Bing, G.F.

1991-08-20

30

Nuclear critics and nuclear economics  

Microsoft Academic Search

The ongoing nuclear debate is given to attacks on the economics of nuclear power that ignore the actual performance of operating plants. Today, almost every existing nuclear power plant has provided significant savings to the customers it supplies. (The exceptions to this, while important, are not being hidden. Instead, the problem plants, Palisades and Browns Ferry in the main, as

Rossin

1978-01-01

31

Las acciones preventivas y de mejora en el contexto de las organizaciones empresariales  

Microsoft Academic Search

Se presenta una herramienta que facilita el control de las acciones preventivas y de mejora en organizaciones que tienen implantado, o pretenden implantar, el sistema de dirección y gestión empresarial, y como parte de este los sistemas de seguridad y salud en el trabajo, calidad, competencia del laboratorio de calibración y ambiental. La mejora es un requisito establecido en las

Rossio Coya Cáceres; Martín Alberto Ayala López; Iosvani Segura Leyva

2011-01-01

32

Comprendiendo las Negociaciones Comerciales Agrícolas de EE.UU.: Un Breve Análisis de las Fuerzas Políticas y Económicas que Moldearán las Posiciones de EE.UU. ante la OMC y en el Área de Libre Comercio de las Américas  

Microsoft Academic Search

Este trabajo examina algunas de las fuerzas políticas y económicas, y las posibles interacciones entre ellas, que moldearán las posiciones de negociación actuales de EE.UU. en la OMC y el ALCA. La discusión se enfocará en tres temas: el papel de la política en el desarrollo de las políticas agrícolas domésticas, el enfoque concentrado del sector agrícola norteamericano ante la

Dale E. Hathaway

2002-01-01

33

LAS Language Arts Supplement, English. Revised Edition.  

ERIC Educational Resources Information Center

This collection of over 100 games and activities is intended to increase oral proficiency among Spanish-speaking children without requiring reading skills. The collection grew out of the desire to provide remedies for specific linguistic weaknesses in English as identified by the Language Assessment Scales (LAS). Because tongue twisters, riddles…

DeAvila, Edward A.; Duncan, Sharon E.

34

Las Políticas Neoliberales y la cuestión Territorial  

Microsoft Academic Search

La profunda crisis del capitalismo y las políticas creadas tendientes a contrarrestarla han colocado en primer plano y como elementos determinantes de ésta, a los procesos económicos en su relación dialéctica con la política y el Estado. La cuestión regional y urbana ha sido considerada secundaria dada la sobrevaloración otorgada a otros procesos políticos, sociales y culturales examinados sin considerar

Emilio Pradilla Cobos

1990-01-01

35

Nuclear astrophysics  

SciTech Connect

The problem of core-collapse supernovae is used to illustrate the many connections between nuclear astrophysics and the problems nuclear physicists study in terrestrial laboratories. Efforts to better understand the collapse and mantle ejection are also motivated by a variety of interdisciplinary issues in nuclear, particle, and astrophysics, including galactic chemical evolution, neutrino masses and mixing, and stellar cooling by the emission of new particles. The current status of theory and observations is summarized.

Haxton, W.C.

1992-01-01

36

Nuclear astrophysics  

SciTech Connect

The problem of core-collapse supernovae is used to illustrate the many connections between nuclear astrophysics and the problems nuclear physicists study in terrestrial laboratories. Efforts to better understand the collapse and mantle ejection are also motivated by a variety of interdisciplinary issues in nuclear, particle, and astrophysics, including galactic chemical evolution, neutrino masses and mixing, and stellar cooling by the emission of new particles. The current status of theory and observations is summarized.

Haxton, W.C.

1992-12-31

37

Nuclear Lamins  

PubMed Central

The nuclear lamins are type V intermediate filament proteins that are critically important for the structural properties of the nucleus. In addition, they are involved in the regulation of numerous nuclear processes, including DNA replication, transcription and chromatin organization. The developmentally regulated expression of lamins suggests that they are involved in cellular differentiation. Their assembly dynamic properties throughout the cell cycle, particularly in mitosis, are influenced by posttranslational modifications. Lamins may regulate nuclear functions by direct interactions with chromatin and determining the spatial organization of chromosomes within the nuclear space. They may also regulate chromatin functions by interacting with factors that epigenetically modify the chromatin or directly regulate replication or transcription.

Dechat, Thomas; Adam, Stephen A.; Taimen, Pekka; Shimi, Takeshi; Goldman, Robert D.

2010-01-01

38

New nuclear strategy: nuclear nonsense  

SciTech Connect

The strategy outlined in a New York Times article by L. Beilenan and Samuel Cohen confirms European fears of losing the US nuclear umbrella. The author points out that the idea of arming Europe with nuclear weapons and then withdrawing is based on inaccuracies and inconsistencies. He notes a pessimism and isolationism in the proposal that would inevitably escalate the arms race despite any minor economies. Destabilizing the present strategy by withdrawing North Atlantic Treaty Organization (NATO) forces is more likely to precipitate a conventional Soviet attack on Europe and a nuclear attack against the US. Only unilateral nuclear disarmanent would be more destabilizing. (DCK)

Carver, L.

1982-04-01

39

Nuclear safety  

NASA Technical Reports Server (NTRS)

Topics dealing with nuclear safety are addressed which include the following: general safety requirements; safety design requirements; terrestrial safety; SP-100 Flight System key safety requirements; potential mission accidents and hazards; key safety features; ground operations; launch operations; flight operations; disposal; safety concerns; licensing; the nuclear engine for rocket vehicle application (NERVA) design philosophy; the NERVA flight safety program; and the NERVA safety plan.

Buden, D.

1991-01-01

40

Nuclear power  

Microsoft Academic Search

It is stated that apart from inevitable waste heat, nuclear power ; stations discharge significant amounts of low-level radioactivity which are ; dangerous, though how dangerous is controversial. It is further stated that ; there are two still more important disadvantages of nuclear power: the danger of ; reactor accidents, which are grent enough to dissuade those experts in risk

1973-01-01

41

Nuclear Fusion.  

National Technical Information Service (NTIS)

Fusion of very light (with only a couple of nucleons) and of heavier nuclei is discussed, respectively, as a source of nuclear energy and towards the extension of the periodic table to include superheavy elements. In particular, laser-induced nuclear fusi...

R. K. Gupta K. V. Subbaram

1978-01-01

42

Criterios para establecer un metodo absoluto semicuantitativo por fluorescencia de rayos-x. Memoria Tecnica. (Criteria to establish an absolute semiquantitative analytic method by x-ray fluorescence. Technical Memory).  

National Technical Information Service (NTIS)

This work had been developed by fluorescence x-ray laboratory of Nuclear Studies Centre form Ecuador, it pretent to stablish an appropiate discernement of a FRX spectrum to know the concentration range form sample elements, minerals principaly, submit to ...

F. Echeverria

1990-01-01

43

Las formas circunscritas de histoplasmosis pulmonar (Histoplasmomas)  

Microsoft Academic Search

Resumen  Se refieren 12 casos de lesiones nodulares circunscritas del pulmón causados por elHistoplasma capsulatum (Histoplasmomas), obtenidos por resecciones pulmonares en personas de ambos sexos entre 10 y 72 años de edad. El diagnóstico\\u000a histo-patológico se realizó aplicando el método de coloración deGömöri modificado porGrocott.\\u000a \\u000a Las pruebas de sensibilidad cutáneas y serológicas resultaron positivas para histoplasmosis. Los cultivos de los especímenes

Alberto Angulo-Ortega

1961-01-01

44

Caracterización de las Diatomitas de Río Seco  

Microsoft Academic Search

Resumen: La existencia de diatomita en la zona de R'o Seco (Piura, Perœ), ha llevado a los autores a realizar un estudio de sus propiedades f'sicas, qu'micas y mineral—gicas, con el objeto de determinar sus principales usos y aplicaciones. Para ello se han utilizado las t?cnicas de an‡lisis convencional, as' como microscop'a —ptica y electr—nica, difracci—n de rayos X y

J. RODRÍGUEZ LICHTENHELDT; J. LOREDO; L. FELIPE VERDEJA; J. GARCÍA IGLESIAS; J. SANCHO MARTÍNEZ

45

Stratigraphic Units in Las Vegas Valley, Nevada  

NASA Astrophysics Data System (ADS)

Using 25 well logs, 15 of which also had accompanying geophysical and aquifer test data were used to describe and establish three alloformations including the Tule Spring and Paradise Valley Alloformations and four aquiformations, the most well defined being, the Las Vegas Springs Aquiformation, in the west central part of the bolson (Donovan, 1996), primarily in Township 20 South, Range 60 East, Mount Diablo Baseline and Meridian (MDBLM), with the stratotypes designated in T20S, R61E S31 MDBLM (36° 9'59.89"N 115°11'26.34"W). The allostratigraphic units were developed using the recommendations in the North American Code of Stratigraphic Nomenclature (NACSN, 1983 and 2005). The hydrostratigraphic units were developed following the recommendations of Seaber (1992). The units constitute the bulk of the upper 500 meter section. Twenty additional wells in the same geographic area, drilled and completed between 1995 and 2005 with detailed geologic and hydrologic information provided confirmation of these units. The proposed stratigraphic units are not part of either, and are located between, the two previously named and non-contiguous formations in the bolson (the Miocene Muddy Creek Formation and the late Pleistocene Las Vegas Formation) (Longwell et al 1965). Las Vegas Valley contains a metropolitan area of approximately two million people. The deeper part of the alluvial basin below 300 ft below ground surface is of interest for supply and storage. The shallower part is of interest for water quality and the interaction between the ground water system and engineered structures.

Donovan, D.

2013-12-01

46

Nuclear Renaissance Requires Nuclear Enlightenment  

Microsoft Academic Search

Nuclear energy was developed by technocratic elites during the Cold War and as a consequence is regarded by many as an authoritarian technology. This paper explores this history, but asks whether, as pressures grow for profound changes in energy use as a result of global anthropogenic climate change, nuclear power might actually represent a means to preserve our liberal society.

W J Nuttall

47

(Nuclear theory). [Research in nuclear physics  

SciTech Connect

This report discusses research in nuclear physics. Topics covered in this paper are: symmetry principles; nuclear astrophysics; nuclear structure; quark-gluon plasma; quantum chromodynamics; symmetry breaking; nuclear deformation; and cold fusion. (LSP)

Haxton, W.

1990-01-01

48

Nuclear Blast  

MedlinePLUS

... the materials - thick walls, concrete, bricks, books and earth - between you and the fallout particles, the better. ... a nuclear weapon detonated in or above the earth’s atmosphere can create an electromagnetic pulse (EMP), a ...

49

Nuclear forces  

SciTech Connect

These lectures present an introduction into the theory of nuclear forces. We focus mainly on the modern approach, in which the forces between nucleons emerge from low-energy QCD via chiral effective field theory.

Machleidt, R. [Department of Physics, University of Idaho, Moscow, Idaho 83844 (United States)

2013-06-10

50

Nuclear hadrodynamics  

SciTech Connect

The role of hadron dynamics in the nucleus is illustrated to show the importance of nuclear medium effects in hadron interactions. The low lying hadron spectrum is considered to provide the natural collective variable for nuclear systems. Recent studies of nucleon-nucleon and delta-nucleon interactions are reviewed, with emphasis on the type of experimental phenomena which signal the importance of the many-body dynamics.

Geesaman, D.F.

1984-11-15

51

Nuclear hadrodynamics  

SciTech Connect

The role of hadron dynamics in the nucleus is illustrated to show the importance of nuclear medium effects in hadron interactions. The low lying hadron spectrum is considered to provide the natural collective variables for nuclear systems. Recent studies of nucleon-nucleon and delta-nucleon interactions are reviewed, with emphasis on the type of experimental phenomena which signal the importance of the many-body dynamics. 28 references.

Geesaman, D.F.

1984-01-01

52

TOP 10 REASONS TO COME TO LAS VEGAS  

Microsoft Academic Search

This article highlights 10 local transportation-engineering innovations in Las Vegas, Nevada. The Las Vegas Area Computer Traffic System (LVACTS) has undergone a significant transformation in preparation for 21st century traffic control. The Tropicana Avenue and Las Vegas Boulevard intersection is a must see for any transportation engineer or planner with its opposing triple left turns and overhead pedestrian walkways. Road

R T Romer; G E Grayson; S K Patel

1999-01-01

53

LANDSCAPE CHANGE OF THE LAS VEGAS VALLEY, 1972 TO 1998  

EPA Science Inventory

Las Vegas has become one of the fastest growing metropolitan areas in the United States. The cities population has doubled from 1980 to 1994 and in 1995 Las Vegas has surpassed the one million mark. The population of Las Vegas is currently growing at a rate of 7 percent annually....

54

?Cuales son las amenazas o peligros volcanicos?  

USGS Publications Warehouse

Los volcanes son capaces de producir numerosos peligros geologicos e hidrologicos. Los cientificos del Servicio Geologico de los EE. UU. (USGS, por sus siglas en ingles) y de otras instituciones alrededor del mundo estan estudiando los peligros de muchos de los centenares de volcanes activos y potencialmente activos del mundo. Estos cientificos vigilan muy de cerca la actividad de algunos de los volcanes mas peligrosos, por lo que estan preparados para alertar a las autoridades y/o a la poblacion en caso de que aumente sustancialmente la probabilidad de que ocurra una erupcion u otro evento peligroso.

Myers, Bobbie; Brantley, Steven R.; Stauffer, Peter; Hendley, James W., II

2000-01-01

55

Advanced Airborne CO2 LAS System  

NASA Astrophysics Data System (ADS)

A unique airborne Laser Absorption Spectroscopy (LAS) system has been developed by ITT Space Systems, LLC to address the needs of the National Research Council Decadal Survey Tier 2 mission for Active Sensing of CO2 Emissions over Nights, Days and Seasons (ASCENDS). This instrument has undergone multiple airborne field tests in cooperation with our partners at NASA Langley Research Center (LaRC). The instrument was built largely with off-the-shelf components and uses high reliability telecom components, including lasers, modulators and fiber amplifiers as the transmitter. Multiple wavelengths are transmitted simultaneously from a single collimator and the return signal is collected by a simple 8” telescope that is fiber coupled to a HgCdTe APD. The analog signal is sampled with a high resolution scope card housed in a National Instruments PXI chassis and the digitized signal is then passed through our custom-built software-based lock-in processing system which allows separation of the signals from the individual wavelengths. The separated signals are then used in the standard Differential Absorption Lidar (DIAL) relations to determine the integrated column differential optical depth. This presentation will give a detailed overview of this multi-frequency, single-beam, synchronous lock-in LAS instrument including the basic methodology of the measurement. Recent improvements in the lock-in methodology designed to eliminate the effects of multi- path fading and frequency dependence of the electronic components will also be discussed.

Dobler, J. T.; Braun, M. G.; McGregor, D. P.; Erxleben, W. H.; Browell, E. V.; Harrison, F. W.

2009-12-01

56

Nuclear scales  

SciTech Connect

Nuclear scales are discussed from the nuclear physics viewpoint. The conventional nuclear potential is characterized as a black box that interpolates nucleon-nucleon (NN) data, while being constrained by the best possible theoretical input. The latter consists of the longer-range parts of the NN force (e.g., OPEP, TPEP, the {pi}-{gamma} force), which can be calculated using chiral perturbation theory and gauged using modern phase-shift analyses. The shorter-range parts of the force are effectively parameterized by moments of the interaction that are independent of the details of the force model, in analogy to chiral perturbation theory. Results of GFMC calculations in light nuclei are interpreted in terms of fundamental scales, which are in good agreement with expectations from chiral effective field theories. Problems with spin-orbit-type observables are noted.

Friar, J.L.

1998-12-01

57

Nuclear power: Fourth edition  

SciTech Connect

This book describes the basics of nuclear power generation, explaining both the benefits and the real and imagined risks of nuclear power. It includes a discussion of the Three Mile Island accident and its effects. Nuclear Power has been used in the public information programs of more than 100 utilities. The contents discussed are: Nuclear Power and People; Why Nuclear Power. Electricity produced by coal; Electricity produced by nuclear fuel; Nuclear plant sites in the United States; Short History of Commercial Nuclear Power; U.S. nuclear submarines, Regulation of Nuclear Power Plants; Licensing process, Nuclear Power Plant Operator Training; Nuclear power plant simulator, Are Nuclear Plants Safe.; Containment structure, Nuclear Power Plant Insurance; Is Radiation Dangerous.; Man-made radiation, What is Nuclear Fuel.; Fuel cycle for commercial nuclear power plants; Warm Water Discharge; Cooling tower; Protection of Radioactive Materials; Plutonium and Proliferation; Disposal of Radioactive Wastes; Are Alternate Energy Sources Available.; Nuclear Opposition; and Nuclear Power in the Future.

Deutsch, R.W.

1986-01-01

58

Nuclear Models  

NASA Astrophysics Data System (ADS)

The atomic nucleus is a typical example of a many-body problem. On the one hand, the number of nucleons (protons and neutrons) that constitute the nucleus is too large to allow for exact calculations. On the other hand, the number of constituent particles is too small for the individual nuclear excitation states to be explained by statistical methods. Another problem, particular for the atomic nucleus, is that the nucleon-nucleon (n-n) interaction is not one of the fundamental forces of Nature, and is hard to put in a single closed equation. The nucleon-nucleon interaction also behaves differently between two free nucleons (bare interaction) and between two nucleons in the nuclear medium (dressed interaction). Because of the above reasons, specific nuclear many-body models have been devised of which each one sheds light on some selected aspects of nuclear structure. Only combining the viewpoints of different models, a global insight of the atomic nucleus can be gained. In this chapter, we revise the the Nuclear Shell Model as an example of the microscopic approach, and the Collective Model as an example of the geometric approach. Finally, we study the statistical properties of nuclear spectra, basing on symmetry principles, to find out whether there is quantum chaos in the atomic nucleus. All three major approaches have been rewarded with the Nobel Prize of Physics. In the text, we will stress how each approach introduces its own series of approximations to reduce the prohibitingly large number of degrees of freedom of the full many-body problem to a smaller manageable number of effective degrees of freedom.

Fossión, Rubén

2010-09-01

59

Impacto de las regulaciones ambientales en las estrategias de comercialización del café costarricense  

Microsoft Academic Search

El uso de instrumentos de gestión ambiental se ha introducido paulatinamente en la forma de hacer negocios de las empresas. Sea por presión externa o por iniciativa local, la implementación de este tipo de prácticas ha venido en aumento y con ello más firmas han visualizado a través de estos esquemas importantes herramientas de apoyo y proyección de sus estrategias

Suyen Alonso Ubieta; Gerardo Jiménez

2009-01-01

60

Nuclear nonproliferation  

SciTech Connect

Foreign ownership, control, or influence (FOCI) over a U.S. company that performs classified work for the Department of Energy (DOE) presents a national security threat because of the potentially uncontrolled transfer of nuclear weapons-related technology or material to foreign entities. This book examines whether DOE and its Lawrence Livermore, Los Alamos, and Sandia weapons laboratories have complied with DOE's regulations and procedures designed to protect the United States against such a risk when they awarded classified contracts, contracts that require access to classified information or significant quantities of special nuclear materials as defined in 10 C.F.R. part 710.

Not Available

1991-03-01

61

Nuclear pursuits  

SciTech Connect

This table lists quantities of warheads (in stockpile, peak number per year, total number built, number of known test explosions), weapon development milestones (developers of the atomic bomb and hydrogen bomb, date of first operational ICBM, first nuclear-powered naval SSN in service, first MIRVed missile deployed), and testing milestones (first fission test, type of boosted fission weapon, multistage thermonuclear test, number of months from fission bomb to multistage thermonuclear bomb, etc.), and nuclear infrastructure (assembly plants, plutonium production reactors, uranium enrichment plants, etc.). Countries included in the tally are the United States, Soviet Union, Britain, France, and China.

Not Available

1993-05-01

62

Nuclear Positioning  

PubMed Central

SUMMARY The nucleus is the largest organelle and is commonly depicted in the center of the cell. Yet during cell division, migration and differentiation, it frequently moves to an asymmetric position aligned with cell function. We consider the toolbox of proteins that move and anchor the nucleus within the cell and how forces generated by the cytoskeleton are coupled to the nucleus to move it. The significance of proper nuclear positioning is underscored by numerous diseases resulting from genetic alterations in the toolbox proteins. Finally, we discuss how nuclear position may influence cellular organization and signaling pathways.

Gundersen, Gregg G.; Worman, Howard J.

2013-01-01

63

Nuclear accident  

Microsoft Academic Search

A malfunctioning valve at the Three Mile Island power plant in Pennsylvania was the prelude to the worst nuclear accident in U.S. history. Despite assurances that radiation leaked from the plant posed no immediate threat, the population around the plant dwindled as unforced weekend evacuations grew common. Radiation at the power plant site reached 30 mrem\\/hr on March 30. While

T. Mathews; S. Agrest; G. Borger; M. Lord; W. D. Marbach; W. J. Cook; M. Sheils

1979-01-01

64

Nuclear Misinformation  

ERIC Educational Resources Information Center

Many scientists feel that research into nuclear safety has been diverted or distorted, and the results of the research concealed or inaccurately reported on a large number of occasions. Of particular concern have been the emergency cooling systems which have not, as yet, been adequately tested. (Author/MA)

Ford, Daniel F.; Kendall, Henry W.

1975-01-01

65

Nuclear medicine  

SciTech Connect

In 1985 and 1986 nuclear medicine became more and more oriented toward in vov chemistry, chiefly as a result of advances in positron emission tomography (PET). The most important trend was the extension of PET technology into the care of patients with brain tumors, epilepsy, and heart disease. A second trend was the increasing use of single-photon emission computed tomography (SPECT).

Wagner, H.N. Jr.

1986-10-17

66

Nuclear energy.  

PubMed

The technical principles and practices of the civil nuclear industry are described with particular reference to fission and its products, natural and artificial radioactivity elements principally concerned and their relationships, main types of reactor, safety issues, the fuel cycle, waste management, issues related to weapon proliferation, environmental considerations and possible future developments. PMID:21180342

Wilson, Peter D

2010-01-01

67

Nuclear Induction  

Microsoft Academic Search

The magnetic moments of nuclei in normal matter will result in a nuclear paramagnetic polarization upon establishment of equilibrium in a constant magnetic field. It is shown that a radiofrequency field at right angles to the constant field causes a forced precession of the total polarization around the constant field with decreasing latitude as the Larmor frequency approaches adiabatically the

F. Bloch

1946-01-01

68

Nuclear reactor  

Microsoft Academic Search

A nuclear reactor of the type which uses liquid metal as primary and secondary coolants, and wherein the reactor vessel contains a core and a plurality of vertically extending cylindrical intermediate heat exchangers for carrying out heat exchange between the primary and secondary coolants; primary coolant circulation pumps disposed outside of the reactor vessel; a pipe for conducting to the

1984-01-01

69

Las Cumbres Observatory Global Telescope Network  

NSDL National Science Digital Library

Las Cumbres Observatory Global Telescope Network (LCOGTN) features a comprehensive science research program and an innovative astronomy-education program featuring state-of-the-art instructional materials appropriate for students at all levels, from elementary school through postsecondary. LCOGTN operates two research-class robotic telescopes, the Faulkes Telescope North, located in Maui, Hawaii, and the Faulkes Telescope South, located in Australia at Siding Spring Observatory. These telescopes are available to teachers to use as part of their curricular or extracurricular activities, and are supported by a range of educational materials and a team of educators and professional astronomers. Additional telescopes in Mississippi, Texas, California, and the United Kingdom will further broaden the Network's scope. Real-time observation and still images available.

Observatory, Las C.

2007-07-02

70

GMT Site Evaluation at Las Campanas Observatory  

NASA Astrophysics Data System (ADS)

The Giant Magellan Telescope project is in the fortunate position of having clear access to a developed site with a long history of excellent performance. Las Campanas Observatory has dark skies, little or no risk of future light pollution, excellent seeing, moderate winds and a high fraction of clear nights. Our site testing effort is concentrated on identifying the best peak within LCO in terms of seeing, turbulence profile, and wind speeds and on quantifying the potential impact of precipitable water vapor on GMT mid-infrared science goals by characterization in terms of both precision and time variability. Thus, we are measuring meteorological characteristics (pressure, temperature, humidity, wind, and cloud cover), seeing, the turbulence profile of the free atmosphere (above 500 m), precipitable water vapor, and light pollution at four sites within the LCO property.

Thomas-Osip, J. E.

2007-10-01

71

Sistema de tratamiento y disposicion final de los residuos urbanos en la Region Metropolitana de Salvador, Bahía  

Microsoft Academic Search

Este artículo trata de las innovaciones tecnicas en el tratamiento de los residuos industriales en la región metropolitana de Salvador y las principales medidas adoptadas para una gestión ambiental de la petroquímica en Bahia, Brasil. La adopción de procedimientos y criterios en conformidad con las normativas internacionales añade una nueva dimensión en la gestión del espacio regional.

Hilda Maria de Carvalho Braga

2007-01-01

72

Nuclear Physics  

Microsoft Academic Search

Nuclear Physics is the branch of physics that deals with the properties and\\u000astructure of matter on the hadronic level. In this article we review briefly\\u000athe history of this field, which has a major role in the development of our\\u000aunderstanding of nature. We then proceed to give an outline of a current\\u000aperspective of the field and of

E. M. Henley; J. P. Schiffer

1935-01-01

73

Nuclear reactor  

Microsoft Academic Search

A nuclear reactor is described including a core having fuel assemblies, upper internals, and neutron-flux adjusting rods and means for moving the neutron-flux adjusting rods between the fuel assemblies and the upper internals. The upper internals includes guide means for guiding the neutron-flux adjusting rods, including columnar guides for guiding certain of the neutron-flux adjusting rods. Each columnar guide coextensive

L. Veronesi; F. D. Obermeyer; J. R. Chrise

1987-01-01

74

Nuclear waste  

SciTech Connect

Radioactive waste is mounting at U.S. nuclear power plants at a rate of more than 2,000 metric tons a year. Pursuant to statute and anticipating that a geologic repository would be available in 1998, the Department of Energy (DOE) entered into disposal contracts with nuclear utilities. Now, however, DOE does not expect the repository to be ready before 2010. For this reason, DOE does not want to develop a facility for monitored retrievable storage (MRS) by 1998. This book is concerned about how best to store the waste until a repository is available, congressional requesters asked GAO to review the alternatives of continued storage at utilities' reactor sites or transferring waste to an MRS facility, GAO assessed the likelihood of an MRSA facility operating by 1998, legal implications if DOE is not able to take delivery of wastes in 1998, propriety of using the Nuclear Waste Fund-from which DOE's waste program costs are paid-to pay utilities for on-site storage capacity added after 1998, ability of utilities to store their waste on-site until a repository is operating, and relative costs and safety of the two storage alternatives.

Not Available

1991-09-01

75

The Nuclear Power/Nuclear Weapons Connection.  

ERIC Educational Resources Information Center

Once they have nuclear power, most countries will divert nuclear materials from commercial to military programs. In excerpts from the book "Facing the Danger" (by Totten, S. and M. W., Crossing Press, 1984), five anti-nuclear activists explain how and why they have been addressing the nuclear connection. (RM)

Totten, Sam; Totten, Martha Wescoat

1985-01-01

76

The Nuclear Power and Nuclear Weapons Connection.  

ERIC Educational Resources Information Center

Explains problems enforcing the Nuclear Non-Proliferation Treaty (NPT) of 1968. Provides factual charts and details concerning the production of nuclear energy and arms, the processing and disposal of waste products, and outlines the nuclear fuel cycle. Discusses safeguards, the risk of nuclear terrorism, and ways to deal with these problems. (NL)

Leventhal, Paul

1990-01-01

77

Las garantías constitucionales en el derecho público de América Latina  

Microsoft Academic Search

Este trabajo está dedicado al estudio de las garantías constitucionales que hoy caracterizan el derecho público latinoamericano y que siguiendo el orden de su consagración son: el habeas corpus, el amparo o tutela de los derechos constitucionales, el control de constitucionalidad y el habeas data, concluyendo con una parte donde se presentan las más recientes y novedosas garantías y los

Eduardo Rozo Acuña

78

Cambio tecnológico y productividad de las empresas industriales uruguayas  

Microsoft Academic Search

En este trabajo se presentan las estimaciones de una función de costos translogarítmica en base a un modelo de datos panel para la industria uruguaya para 541 empresas entre 1988-1994. Asimismo se presentan las estimaciones para distintos agrupamientos, por tipo de empresa, mercado y división. Para el promedio de la muestra, el efecto neto de la escala y el cambio

Ruben Tansini; Patricia Triunfo

1998-01-01

79

Association Meeting Planners' Perceived Performance of Las Vegas  

Microsoft Academic Search

The meeting planner of a particular association is often instrumental in influencing what city will best accommodate the needs of the organization. This study examined how Las Vegas as a convention city meets preferences of association meeting planners by applying Importance-Performance analysis (IPA). Qualitative (open-ended) evaluations were also sought to complement the analysis. The findings showed that Las Vegas effectively

Seyhmus Baloglu; Curtis Love

2003-01-01

80

COEFICIENTE DE RECURSOS PROPIOS Y FINANCIACIÓN DE LAS ENTIDADES BANCARIAS  

Microsoft Academic Search

El objetivo de este artículo es estudiar la fijación del cociente de capi- tal, esto es, el porcentaje que representan los recursos propios sobre el total de activos, por parte de las empresas bancarias. Para ello, se pro- pone un modelo teórico que analiza la existencia de un cociente de ca- pital objetivo distinguiendo dos regímenes: uno para las empresas

VÍCTOR E. BARRIOS; JUAN M. BLANCO

81

El impacto de las reformas estructurales en la agricultura colombiana  

Microsoft Academic Search

Colombia, como la mayor parte de los países latinoamericanos, emprendió un ambicioso proceso de liberalización y reformas al clarear la década de los años noventa, el cual cobijó al sector agropecuario. Las reformas en el agro tuvieron tres períodos: desde el segundo semestre de 1990 hasta finales de 1992 se pusieron en marcha la mayoría de las reformas iniciales, de

Santiago Perry

2000-01-01

82

Los sistemas y las auditorías de gestión integral  

Microsoft Academic Search

Las auditorías integrales (calidad, ambiental y seguridad, y salud ocupacional) son hoy por hoy una herramienta que se ha consolidado en la gestión empresarial de cualquier organización como un elemento evaluador y de cierre del ciclo planear-hacer-verificar-actuar; que les permite a las empresas medir su desempeño de forma integral y garantizar el cumplimiento legal y de estándares internacionales (ya sea

Clara Inés Pardo Martínez

2008-01-01

83

Nuclear dualism.  

PubMed

Nuclear dualism is a characteristic feature of the ciliated protozoa. Tetrahymena have two different nuclei in each cell. The larger, polyploid, somatic macronucleus (MAC) is the site of transcriptional activity in the vegetatively growing cell. The smaller, diploid micronucleus (MIC) is transcriptionally inactive in vegetative cells, but is transcriptionally active in mating cells and responsible for the genetic continuity during sexual reproduction. Although the MICs and MACs develop from mitotic products of a common progenitor and reside in a common cytoplasm, they are different from one another in almost every respect. PMID:22444142

Karrer, Kathleen M

2012-01-01

84

Nuclear security  

SciTech Connect

The Department of Energy's (DOE) Lawrence Livermore National Laboratory, located in Livermore, California, generates and controls large numbers of classified documents associated with the research and testing of nuclear weapons. Concern has been raised about the potential for espionage at the laboratory and the national security implications of classified documents being stolen. This paper determines the extent of missing classified documents at the laboratory and assesses the adequacy of accountability over classified documents in the laboratory's custody. Audit coverage was limited to the approximately 600,000 secret documents in the laboratory's custody. The adequacy of DOE's oversight of the laboratory's secret document control program was also assessed.

Dingell, J.D.

1991-02-01

85

Nuclear energy.  

PubMed

Nuclear energy can play a role in carbon free production of electrical energy, thus making it interesting for tomorrow's energy mix. However, several issues have to be addressed. In fission technology, the design of so-called fourth generation reactors show great promise, in particular in addressing materials efficiency and safety issues. If successfully developed, such reactors may have an important and sustainable part in future energy production. Working fusion reactors may be even more materials efficient and environmental friendly, but also need more development and research. The roadmap for development of fourth generation fission and fusion reactors, therefore, asks for attention and research in these fields must be strengthened. PMID:20873683

Grandin, Karl; Jagers, Peter; Kullander, Sven

2010-01-01

86

LAS - LAND ANALYSIS SYSTEM, VERSION 5.0  

NASA Technical Reports Server (NTRS)

The Land Analysis System (LAS) is an image analysis system designed to manipulate and analyze digital data in raster format and provide the user with a wide spectrum of functions and statistical tools for analysis. LAS offers these features under VMS with optional image display capabilities for IVAS and other display devices as well as the X-Windows environment. LAS provides a flexible framework for algorithm development as well as for the processing and analysis of image data. Users may choose between mouse-driven commands or the traditional command line input mode. LAS functions include supervised and unsupervised image classification, film product generation, geometric registration, image repair, radiometric correction and image statistical analysis. Data files accepted by LAS include formats such as Multi-Spectral Scanner (MSS), Thematic Mapper (TM) and Advanced Very High Resolution Radiometer (AVHRR). The enhanced geometric registration package now includes both image to image and map to map transformations. The over 200 LAS functions fall into image processing scenario categories which include: arithmetic and logical functions, data transformations, fourier transforms, geometric registration, hard copy output, image restoration, intensity transformation, multispectral and statistical analysis, file transfer, tape profiling and file management among others. Internal improvements to the LAS code have eliminated the VAX VMS dependencies and improved overall system performance. The maximum LAS image size has been increased to 20,000 lines by 20,000 samples with a maximum of 256 bands per image. The catalog management system used in earlier versions of LAS has been replaced by a more streamlined and maintenance-free method of file management. This system is not dependent on VAX/VMS and relies on file naming conventions alone to allow the use of identical LAS file names on different operating systems. While the LAS code has been improved, the original capabilities of the system have been preserved. These include maintaining associated image history, session logging, and batch, asynchronous and interactive mode of operation. The LAS application programs are integrated under version 4.1 of an interface called the Transportable Applications Executive (TAE). TAE 4.1 has four modes of user interaction: menu, direct command, tutor (or help), and dynamic tutor. In addition TAE 4.1 allows the operation of LAS functions using mouse-driven commands under the TAE-Facelift environment provided with TAE 4.1. These modes of operation allow users, from the beginner to the expert, to exercise specific application options. LAS is written in C-language and FORTRAN 77 for use with DEC VAX computers running VMS with approximately 16Mb of physical memory. This program runs under TAE 4.1. Since TAE 4.1 is not a current version of TAE, TAE 4.1 is included within the LAS distribution. Approximately 130,000 blocks (65Mb) of disk storage space are necessary to store the source code and files generated by the installation procedure for LAS and 44,000 blocks (22Mb) of disk storage space are necessary for TAE 4.1 installation. The only other dependencies for LAS are the subroutine libraries for the specific display device(s) that will be used with LAS/DMS (e.g. X-Windows and/or IVAS). The standard distribution medium for LAS is a set of two 9track 6250 BPI magnetic tapes in DEC VAX BACKUP format. It is also available on a set of two TK50 tape cartridges in DEC VAX BACKUP format. This program was developed in 1986 and last updated in 1992.

Pease, P. B.

1994-01-01

87

Prospects for Nuclear Power  

Microsoft Academic Search

The prospects for a revival of nuclear power were dim even before the partial reactor meltdowns at the Fukushima nuclear plant. Nuclear power has long been controversial because of concerns about nuclear accidents, proliferation risk, and the storage of spent fuel. These concerns are real and important. In addition, however, a key challenge for nuclear power has been the high

Lucas W. Davis

2011-01-01

88

Nuclear power: Fourth edition  

Microsoft Academic Search

This book describes the basics of nuclear power generation, explaining both the benefits and the real and imagined risks of nuclear power. It includes a discussion of the Three Mile Island accident and its effects. Nuclear Power has been used in the public information programs of more than 100 utilities. The contents discussed are: Nuclear Power and People; Why Nuclear

Deutsch

1986-01-01

89

Prospects for Nuclear Power  

Microsoft Academic Search

Nuclear power has long been controversial because of concerns about nuclear accidents, storage of spent fuel, and how the spread of nuclear power might raise risks of the proliferation of nuclear weapons. These concerns are real and important. However, emphasizing these concerns implicitly suggests that unless these issues are taken into account, nuclear power would otherwise be cost effective compared

Lucas W. Davis

2012-01-01

90

Airborne Validation of Active CO2 LAS Measurements  

NASA Astrophysics Data System (ADS)

A unique, multi-frequency, single-beam, laser absorption spectrometer (LAS) that operates at 1.57 ?m has been developed for a future space-based mission to determine the global distribution of sources and sinks of atmospheric carbon dioxide (CO2). A prototype of the space-based LAS system was developed by ITT, and it has been successfully flight tested in seven airborne campaigns conducted in different geographic regions over the last four years. Flight tests were conducted over Oklahoma, Michigan, New Hampshire, and Virginia under a wide range of atmospheric conditions. Remote LAS measurements were compared to high-quality in situ measurements obtained from instrumentation on the same aircraft on spirals under the ground track of the LAS. LAS flights were conducted over a wide range of land and water reflectances and in the presence of scattered clouds. An extensive data set of CO2 measurements has been obtained for evaluating the LAS performance. These LAS test flights resulted in the first demonstration of high-precision, high-accuracy, remote laser measurements of CO2 from an airborne platform. The LAS CO2 column measurements were found to have a precision for a 10-s horizontal average (~1 km) of better than 1 ppm of CO2 over land and 1.3 ppm over water. Absolute comparisons of CO2 remote and in situ measurements showed agreement on average to better than 0.5 ppm of CO2 with a standard deviation of the agreement to better than 2 ppm of CO2. In addition, results of recent coordinated aircraft flight tests of different CO2 LAS systems and different in situ CO2 measurement systems over Oklahoma and Virginia in July-August 2009 are also discussed in this paper.

Browell, E. V.; Dobler, J.; Kooi, S.; Choi, Y.; Harrison, F.; Moore, B.; Zaccheo, T.

2009-12-01

91

Fate of linear alkylbenzene sulfonate (LAS) in activated sludge plants.  

PubMed

Monitoring data were collected in a pilot-scale municipal activated sludge plant to assess the fate of the C12-homologue of linear alkyl benzene sulfonate (LAS-C12). The pilot-plant was operated at influent LAS-C12 concentrations between 2 and 12 mg l(-1) and at sludge retention times of 10 and 27 days. Effluent and waste sludge concentrations varied between 5 and 10 microg l(-1) and between 37 and 69 microg g(-1) VSS, respectively. In the sludge samples only 2-8% was present as dissolved LAS-C12, whereas the remaining 92-98% was found to be adsorbed to the sludge. In spite of this high degree of sorption, more than 99% of the LAS-C12 load was removed by biodegradation, showing that not only the soluble fraction but also the adsorbed fraction of LAS-C12 is readily available for biodegradation. Sorption and biodegradation of LAS-C12 were also investigated separately. Sorption was an extremely fast and reversible process and could be described by a linear isotherm with a partition coefficient of 3.2 l g(-1) volatile suspended solids. From the results of biodegradation kinetic tests it was concluded that primary biodegradation of LAS-C12 cannot be described by a (growth) Monod model, but a secondary utilisation model should be used instead. The apparent affinity of the sludge to biodegrade LAS-C12 increased when the sludge was loaded with higher influent concentrations of LAS-C12. PMID:14769410

Temmink, H; Klapwijk, Bram

2004-02-01

92

Basic Nuclear Science Information  

NSDL National Science Digital Library

This webpage from the Lawrence Berkeley National Laboratory contains an overview of the basic concepts in nuclear science. Nuclear structure, particle decay, nuclear reactions, and cosmic rays are briefly discussed. The page also contains helpful pictures to illustrate the concepts.

2009-10-30

93

Nuclear Medicine Imaging  

MedlinePLUS

Nuclear Medicine Imaging What you need to know about… A nuclear medicine procedure is sometimes described as an “inside-out” ... that is directed through the patient’s body. Nuclear medicine procedures use small amounts of radioactive materials, called ...

94

Nuclear Heart Scan  

MedlinePLUS

... from the NHLBI on Twitter. What Is a Nuclear Heart Scan? A nuclear heart scan is a test that provides important ... use it to create pictures of your heart. Nuclear heart scans are used for three main purposes: ...

95

Nuclear Scans (Cancer)  

MedlinePLUS

... more References Previous Topic Mammography Next Topic Ultrasound Nuclear scans Other names include nuclear imaging , radionuclide imaging , ... to more radiation. Use of monoclonal antibodies in nuclear scans: A special type of antibody produced in ...

96

Nuclear analytical chemistry  

SciTech Connect

This book covers the general theories and techniques of nuclear chemical analysis, directed at applications in analytical chemistry, nuclear medicine, radiophysics, agriculture, environmental sciences, geological exploration, industrial process control, etc. The main principles of nuclear physics and nuclear detection on which the analysis is based are briefly outlined. An attempt is made to emphasise the fundamentals of activation analysis, detection and activation methods, as well as their applications. The book provides guidance in analytical chemistry, agriculture, environmental and biomedical sciences, etc. The contents include: the nuclear periodic system; nuclear decay; nuclear reactions; nuclear radiation sources; interaction of radiation with matter; principles of radiation detectors; nuclear electronics; statistical methods and spectral analysis; methods of radiation detection; neutron activation analysis; charged particle activation analysis; photon activation analysis; sample preparation and chemical separation; nuclear chemical analysis in biological and medical research; the use of nuclear chemical analysis in the field of criminology; nuclear chemical analysis in environmental sciences, geology and mineral exploration; and radiation protection.

Brune, D.; Forkman, B.; Persson, B.

1984-01-01

97

Las corporaciones autonomas regionales del caribe colombiano: Un analisis de sus finanzas y gobierno corporativo  

Microsoft Academic Search

Las Corporaciones Autónomas Regionales (car) y las Corporaciones de Desarrollo Sostenible (cds) son las instituciones encargadas de la protección del medio ambiente en Colombia. Este trabajo estudia el desempeño de las corporaciones que tienen jurisdicción sobre la Costa Caribe. En particular, examina sus principales fortalezas y limitaciones administrativas, y analiza si en sus presupuestos se reproducen las desigualdades regionales que

Joaquin Viloria de la Hoz

2011-01-01

98

Las revistas internacionales de geografía física: análisis de las publicaciones reflejadas en el Science Citation Index del Journal of Citation Reports durante el período 1989-2004  

Microsoft Academic Search

El manejo de los índices de impacto de las revistas internacionales es capital para investigadores, profesores y estudiantes de tercer ciclo ya que permite seleccionar la publicación más adecuada para dirigir las investigaciones. Al margen, en la actualidad, las trayectorias curriculares se están midiendo a través de las publicaciones en revistas indexadas, por lo que el conocimiento de estos índices

Carles Barriocanal Lozano

2007-01-01

99

Nuclear Fuel Cycle & Vulnerabilities  

SciTech Connect

The objective of safeguards is the timely detection of diversion of significant quantities of nuclear material from peaceful nuclear activities to the manufacture of nuclear weapons or of other nuclear explosive devices or for purposes unknown, and deterrence of such diversion by the risk of early detection. The safeguards system should be designed to provide credible assurances that there has been no diversion of declared nuclear material and no undeclared nuclear material and activities.

Boyer, Brian D. [Los Alamos National Laboratory

2012-06-18

100

An Aerial Radiological Survey of Selected Areas of the City of North Las Vegas  

SciTech Connect

As part of the proficiency training for the Radiological Mapping mission of the Aerial Measuring System (AMS), a survey team from the Remote Sensing Laboratory-Nellis (RSL-Nellis) conducted an aerial radiological survey of selected areas of the city of North Las Vegas for the purpose of mapping natural radiation background and locating any man-made radioactive sources. Survey areas were selected in collaboration with the City Manager's office and included four separate areas: (1) Las Vegas Motor Speedway (10.6 square miles); (2) North Las Vegas Downtown Area (9.2 square miles); (3) I-15 Industrial Corridor (7.4 square miles); and (4) Future site of University of Nevada Las Vegas campus (17.4 square miles). The survey was conducted in three phases: Phase 1 on December 11-12, 2007 (Areas 1 and 2), Phase 2 on February 28, 2008 (Area 3), and Phase 3 on March 19, 2008 (Area 4). The total completed survey covered a total of 44.6 square miles. The flight lines (without the turns) over the surveyed areas are presented in Figures 1, 2, 3, and 4. A total of eight 2.5-hour-long flights were performed at an altitude of 150 ft above ground level (AGL) with 300 feet of flight-line spacing. Water line and test line flights were conducted over the Lake Mead and Government Wash areas to ensure quality control of the data. The data were collected by the AMS data acquisition system (REDAR V) using an array of twelve 2-inch x 4-inch x 16-inch sodium iodide (NaI) detectors flown on-board a twin-engine Bell 412 helicopter. Data, in the form of gamma energy spectra, were collected continually (every second) over the course of the survey and were geo-referenced using a differential Global Positioning System. Collection of spectral data allows the system to distinguish between ordinary fluctuations in natural background radiation levels and the signature produced by man-made radioisotopes. Spectral data can also be used to identify specific radioactive isotopes. As a courtesy service, with the approval of the U.S. Department of Energy, National Nuclear Security Administration, Nevada Site Office, RSL-Nellis is providing this summary to the office of the Mayor of the City of North Las Vegas along with the gross-count-based exposure rate and man-made count contour maps and GIS shape files in electronic format on a compact disk.

Piotr Wasiolek

2008-06-01

101

Focused technology: Nuclear propulsion  

NASA Technical Reports Server (NTRS)

Five viewgraphs are presented that outline the objectives and elements of the Nuclear Propulsion Program, mission considerations, propulsion technologies, and the logic flow path for nuclear propulsion development.

Miller, Thomas J.

1993-01-01

102

Nuclear weapons modernizations  

NASA Astrophysics Data System (ADS)

This article reviews the nuclear weapons modernization programs underway in the world's nine nuclear weapons states. It concludes that despite significant reductions in overall weapons inventories since the end of the Cold War, the pace of reductions is slowing - four of the nuclear weapons states are even increasing their arsenals, and all the nuclear weapons states are busy modernizing their remaining arsenals in what appears to be a dynamic and counterproductive nuclear competition. The author questions whether perpetual modernization combined with no specific plan for the elimination of nuclear weapons is consistent with the nuclear Non-Proliferation Treaty and concludes that new limits on nuclear modernizations are needed.

Kristensen, Hans M.

2014-05-01

103

Focused Technology: Nuclear Propulsion.  

National Technical Information Service (NTIS)

Five viewgraphs are presented that outline the objectives and elements of the Nuclear Propulsion Program, mission considerations, propulsion technologies, and the logic flow path for nuclear propulsion development.

T. J. Miller

1993-01-01

104

Flow cytometric analysis of a marine LAS-degrading consortia.  

PubMed

The specific nucleic acid fluorochrome SYTO-13 was used in flow cytometric analysis to assess changes in the density and heterogeneity of marine bacterial populations which biodegrade linear alkylbenzene sulphonate (LAS). Seawater samples with LAS and incubated in the laboratory (20 degrees C, 100 rpm, 30 days) were used to monitor LAS-degrading consortia. Flow cytometric studies and culture methods were used to characterize the LAS degrading bacterioplankton consortia. Fluorescence and scatter signals enabled us to define three regions (R1, R2 and R3) in the dual parameter cytograms. The distribution of the bacterial counts in these regions allowed us to monitor the formation and evolution of the consortia. PMID:10677841

López-Amorós, R; Comas, J; Garcia, M T; Vives-Rego, J

2000-01-01

105

Thermal expansion in metal\\/lithia-alumina-silica (LAS) composites  

Microsoft Academic Search

Lithia-alumina-silica (LAS) with metallic dispersions offers a new approach toward near-zero, isotropic, thermal expansion composites. The metallic phase contributes a positive coefficient of thermal expansion (CTE) to the negative CTE of the glass\\/ceramic matrix. In addition, the metal will increase the electrical and thermal conductivities over those of the matrix alone. The LAS system offers tailorable negative CTEs and light

E. G. Wolff

1988-01-01

106

Visualizing Large Datasets with LAS and Google Earth  

NASA Astrophysics Data System (ADS)

As experiments and simulations in Earth System Science grow larger and more complex, dataset volumes are growing explosively. Web-based visualization and analysis of these datasets is becoming a challenge due to large amount of data and the limit of network bandwidth. The Live Access Server (LAS) is a highly configurable Web server designed to provide flexible access to visualization and analysis products generated from geo- referenced scientific datasets. In this presentation, we introduce a new capability of LAS for interactively visualizing large datasets by utilizing the view-based refresh queries of Google Earth and the automatic decimation ("striding") capabilities of Ferret. When viewing a high resolution dataset on a global scale it is wasteful of bandwidth to handle the full resolution data. With the striding capability, Ferret selects every nth point along an axis, where n is the striding value. The striding values are dynamically computed based upon the size of the area of interest. The automatic striding approach minimizes the volume of data that need be touched to visualize a large geographic area. Higher resolutions are utilized for smaller areas to reveal the fine structures. The LAS provides this behavior using Google Earth as the user interface. As users zoom or pan on Google Earth, Google Earth interacts with LAS through a Network Link, which contains the URL of a LAS server. When the view inside Google Earth stops for a set number of seconds, it makes a request to a LAS server, sending the LAS server the latitude and longitude boundaries (bounding box) of the area currently in view. The LAS server uses that information to compute stride values, instruct Ferret to generate a visualization for that particular geographic area, and send the resulting image back to Google Earth.

Li, J.; Schweitzer, R.; Hankin, S.; Manke, A.; O'Brien, K.

2007-12-01

107

Radiological effluents released from nuclear rocket and ramjet engine tests at the Nevada Test Site 1959 through 1969: Fact Book  

SciTech Connect

Nuclear rocket and ramjet engine tests were conducted on the Nevada Test Site (NTS) in Area 25 and Area 26, about 80 miles northwest of Las Vegas, Nevada, from July 1959 through September 1969. This document presents a brief history of the nuclear rocket engine tests, information on the off-site radiological monitoring, and descriptions of the tests.

Friesen, H.N.

1995-06-01

108

The Arabidopsis nuclear pore and nuclear envelope.  

PubMed

The nuclear envelope is a double membrane structure that separates the eukaryotic cytoplasm from the nucleoplasm. The nuclear pores embedded in the nuclear envelope are the sole gateways for macromolecular trafficking in and out of the nucleus. The nuclear pore complexes assembled at the nuclear pores are large protein conglomerates composed of multiple units of about 30 different nucleoporins. Proteins and RNAs traffic through the nuclear pore complexes, enabled by the interacting activities of nuclear transport receptors, nucleoporins, and elements of the Ran GTPase cycle. In addition to directional and possibly selective protein and RNA nuclear import and export, the nuclear pore gains increasing prominence as a spatial organizer of cellular processes, such as sumoylation and desumoylation. Individual nucleoporins and whole nuclear pore subcomplexes traffic to specific mitotic locations and have mitotic functions, for example at the kinetochores, in spindle assembly, and in conjunction with the checkpoints. Mutants of nucleoporin genes and genes of nuclear transport components lead to a wide array of defects from human diseases to compromised plant defense responses. The nuclear envelope acts as a repository of calcium, and its inner membrane is populated by functionally unique proteins connected to both chromatin and-through the nuclear envelope lumen-the cytoplasmic cytoskeleton. Plant nuclear pore and nuclear envelope research-predominantly focusing on Arabidopsis as a model-is discovering both similarities and surprisingly unique aspects compared to the more mature model systems. This chapter gives an overview of our current knowledge in the field and of exciting areas awaiting further exploration. PMID:22303264

Meier, Iris; Brkljacic, Jelena

2010-01-01

109

Nuclear reactor  

DOEpatents

A nuclear reactor comprising a cylindrical pressure vessel, an elongated annular core centrally disposed within and spaced from the pressure vessel, and a plurality of ducts disposed longitudinally of the pressure vessel about the periphery thereof, said core comprising an annular active portion, an annular reflector just inside the active portion, and an annular reflector just outside the active a portion, said annular active portion comprising rectangular slab, porous fuel elements radially disposed around the inner reflector and extending the length of the active portion, wedge-shaped, porous moderator elements disposed adjacent one face of each fuel element and extending the length of the fuel element, the fuel and moderator elements being oriented so that the fuel elements face each other and the moderator elements do likewise, adjacent moderator elements being spaced to provide air inlet channels, and adjacent fuel elements being spaced to provide air outlet channels which communicate with the interior of the peripheral ducts, and means for introducing air into the air inlet channels which passes through the porous moderator elements and porous fuel elements to the outlet channel.

Thomson, Wallace B. (Severna Park, MD)

2004-03-16

110

Nuclear reactor  

SciTech Connect

A nuclear reactor is described including a core having fuel assemblies, upper internals, and neutron-flux adjusting rods and means for moving the neutron-flux adjusting rods between the fuel assemblies and the upper internals. The upper internals includes guide means for guiding the neutron-flux adjusting rods, including columnar guides for guiding certain of the neutron-flux adjusting rods. Each columnar guide coextensive generally vertical guide sections aligned to receive the certain neutron-flux adjusting rods, the guide means also including generally horizontal plate sections connected to the guide sections and positioned generally vertically along the upper internals. Each plate section nested in the manner of a ''jig-saw'' puzzle and secured to, adjacent plate sections at the generally vertical level of each plate section to form an integrated composite plate at each level. These extend laterally substantially throughout the upper internals, each plate section having perforations patterned to pass others of the neutron-flux adjusting rods, the plate sections being oriented each at its generally vertical level with their perforations for the others of the neutron-flux adjusting rods aligned so that the composite plates serve as guides for the others of the neutron-flux adjusting rods.

Veronesi, L.; Obermeyer, F.D.; Chrise, J.R.

1987-07-21

111

An Aerial Radiological Survey of the City of North Las Vegas (Downtown) and the Motor Speedway  

SciTech Connect

As part of the proficiency training for the Radiological Mapping mission of the Aerial Measuring System (AMS), a survey team from the Remote Sensing Laboratory-Nellis (RSL-Nellis) conducted an aerial radiological survey on December 11-12, 2007, with the purpose of mapping natural radiation background and locating any man-made radioactive sources. The survey covered 19.4 square miles (9.2 square miles over the downtown area of the City of North Las Vegas and 10.2 square miles over the Las Vegas Motor Speedway [LVMS]). The flight lines over the surveyed areas are presented in Figures 1 and 2. A total of four 2.5-hour-long flights were performed at an altitude of 150 ft above ground level (AGL) with 300 ft of flight line spacing. Water line and test line flights were conducted over the Lake Mead and Government Wash areas to ensure quality control of the data. The data were collected by the AMS data acquisition system-REDAR V using an array of twelve 2-inch x 4-inch x 16-inch sodium iodide (NaI) detectors flown on-board a twin-engine Bell 412 helicopter. Data in the form of gamma energy spectra were collected continually (every second) over the course of the survey and were geo-referenced using a differential Global Positioning System. Collection of spectral data allows the system to distinguish between ordinary fluctuations in natural background radiation levels and the signature produced by man-made radioisotopes sources. Spectral data can also be used to identify specific radioactive isotopes. As a courtesy service with the approval of the U.S. Department of Energy, National Nuclear Security Administration, Nevada Site Office, RSL-Nellis is providing this summary to the office of the Mayor of City of North Las Vegas and LVMS security along with the gross counts-based exposure rate and man-made counts maps.

Piotr Wasiolek

2007-12-01

112

INTRAVAL Phase 2: Modeling testing at the Las Cruces Trench Site  

SciTech Connect

Several field experiments have been performed by scientists from the University of Arizona and New Mexico State University at the Las Cruces Trench Site to provide data tc test deterministic and stochastic models for water flow and solute transport. These experiments were performed in collaboration with INTRAVAL, an international effort toward validation of geosphere models for the transport of radionuclides. During Phase I of INTRAVAL, qualitative comparisons between experimental data and model predictions were made using contour plots of water contents and solute concentrations. Detailed quantitative comparisons were not made. To provide data for more rigorous model testing, a third Las Cruces Trench experiment was designed by scientists from the University of Arizona and New Mexico State University. Modelers from the Center for Nuclear Waste Regulatory Analysis, Massachusetts Institute of Technology, New Mexico State University, Pacific Northwest Laboratory, and the University of Texas provided predictions of water flow and tritium transport to New Mexico State University for analysis. The corresponding models assumed soil characterizations ranging from uniform to deterministically heterogeneous to stochastic. This report presents detailed quantitative comparisons to field data.

Hills, R.G. [New Mexico State Univ., Las Cruces, NM (United States). Dept. of Mechanical Engineering; Wierenga, P.J. [Arizona Univ., Tucson, AZ (United States). Dept. of Soil and Water Science; Luis, S.; McLaughlin, D. [Massachusetts Inst. of Tech., Cambridge, MA (United States); Rockhold, M. [Pacific Northwest Lab., Richland, WA (United States); Xiang, J.; Scanlon, B. [Texas Univ., Austin, TX (United States). Bureau of Economic Geology; Wittmeyer, G. [Southwest Research Inst., San Antonio, TX (United States). Center for Nuclear Waste Regulatory Analyses

1994-01-01

113

Nuclear Dabases for Reactor Applications  

National Technical Information Service (NTIS)

The National Nuclear Data Center (NNDC): An overview of nuclear databases, related products, nuclear data Web services and publications. The NNDC collects, evaluates, and disseminates nuclear physics data for basic research and applied nuclear technologie...

B. Pritychenko R. Arcilla T. Burrows M. W. Mughabghab P. Oblozinsky D. Rochman A. A. Sonzogni J. Tuli D. F. Winchell

2006-01-01

114

Terrorists and Nuclear Technology  

ERIC Educational Resources Information Center

This essay explores the ways terrorist groups may gain possession of nuclear materials; the way in which they may use nuclear weapons and other nuclear technologies to their benefit; and various courses of action designed to minimize the possibilities of terrorists utilizing nuclear technology to their benefit and society's detriment. (BT)

Krieger, David

1975-01-01

115

Nuclear air cushion vehicles  

NASA Technical Reports Server (NTRS)

The state-of-the-art of the still-conceptual nuclear air cushion vehicle, particularly the nuclear powerplant is identified. Using mission studies and cost estimates, some of the advantages of nuclear power for large air cushion vehicles are described. The technology studies on mobile nuclear powerplants and conceptual ACV systems/missions studies are summarized.

Anderson, J. L.

1973-01-01

116

Nuclear Fuel Cycle & Vulnerabilities  

Microsoft Academic Search

The objective of safeguards is the timely detection of diversion of significant quantities of nuclear material from peaceful nuclear activities to the manufacture of nuclear weapons or of other nuclear explosive devices or for purposes unknown, and deterrence of such diversion by the risk of early detection. The safeguards system should be designed to provide credible assurances that there has

Brian D

2012-01-01

117

Nuclear energy and security  

SciTech Connect

Nuclear power is an important and, the authors believe, essential component of a secure nuclear future. Although nuclear fuel cycles create materials that have some potential for use in nuclear weapons, with appropriate fuel cycles, nuclear power could reduce rather than increase real proliferation risk worldwide. Future fuel cycles could be designed to avoid plutonium production, generate minimal amounts of plutonium in proliferation-resistant amounts or configurations, and/or transparently and efficiently consume plutonium already created. Furthermore, a strong and viable US nuclear infrastructure, of which nuclear power is a large element, is essential if the US is to maintain a leadership or even participatory role in defining the global nuclear infrastructure and controlling the proliferation of nuclear weapons. By focusing on new fuel cycles and new reactor technologies, it is possible to advantageously burn and reduce nuclear materials that could be used for nuclear weapons rather than increase and/or dispose of these materials. Thus, the authors suggest that planners for a secure nuclear future use technology to design an ideal future. In this future, nuclear power creates large amounts of virtually atmospherically clean energy while significantly lowering the threat of proliferation through the thoughtful use, physical security, and agreed-upon transparency of nuclear materials. The authors must develop options for policy makers that bring them as close as practical to this ideal. Just as Atoms for Peace became the ideal for the first nuclear century, they see a potential nuclear future that contributes significantly to power for peace and prosperity.

BLEJWAS,THOMAS E.; SANDERS,THOMAS L.; EAGAN,ROBERT J.; BAKER,ARNOLD B.

2000-01-01

118

Initial Results From the Las Vegas Valley Broadband Array Based on Differential Travel Time Residuals and Interstation Phase Velocities  

NASA Astrophysics Data System (ADS)

Eight broadband seismometers, collectively known as the Las Vegas Valley Broadband array (LVVBB), were deployed by Lawrence Livermore National Laboratory (LLNL) and the University of Nevada Las Vegas (UNLV) in September 2002. The LVVBB array recorded data continuously from local and regional earthquakes as well as global teleseisms through late January 2003. The coverage area extends throughout the northeastern regions of the Las Vegas Valley; the area estimated to be the deepest portion of the Las Vegas basin based on gravity data. Differential travel time residuals were calculated through the cross-correlation of P-wave arrivals from global teleseisims to better constrain basin geometry and depth to basement. The calculated delay times show variations up to 0.5 s over distances of 15 km or less. The residual pattern is consistent across the basin and is associated with zones of thicker basin fill. This supports earlier models of the basin. A number of regional earthquakes originating in southern California are linearly aligned with the LVVBB array. Interstation phase velocities of Rayleigh wave propagation from these events are being used to create surface wave dispersion curves to assist in modeling the shear wave velocity structure of the region. Given the current models, average shear velocities of 0.96 km/s and 1.25 km/s characterize the change from shallow to deep sediments. These new results will further constrain the shear wave velocity in the study area, and aid in evaluating the behavior of basin fill for building construction. These studies contribute to the modeling of ground-motions in Las Vegas Valley and can be used to assess the Valley's response in the event of an earthquake or future nuclear testing at the Nevada Test Site.

McEwan, D. J.; Snelson, C. M.; Tkalcic, H.; Rodgers, A.

2003-12-01

119

Vertical nuclear proliferation  

Microsoft Academic Search

All the nuclear-weapon states are working to develop new nuclear-weapon systems and upgrade their existing ones. Although the US Congress has recently blocked further development of small nuclear weapons and earth-penetrating nuclear weapons, the United States is planning a range of new warheads under the Reliable Replacement Warhead programme, and renewing its nuclear weapons infrastructure. The United Kingdom is spending

Victor W. Sidel

2007-01-01

120

Determining nuclear shape  

PubMed Central

Changes in nuclear morphology are observed in diverse developmental processes as well as in pathological conditions. Modification of nuclear membrane and nuclear lamina protein levels results in altered nuclear shapes, as it has been demonstrated in experimental systems ranging from yeast to human cells. The important role of nuclear membrane components in regulating nuclear morphology is additionally highlighted by the abnormally shaped nuclei observed in diseases where nuclear lamina proteins are mutated. Even though the effect of nuclear envelope components on nuclear shape has been thoroughly described, not much is known about the molecular mechanisms that govern these events. In addition to the known role of intermediate filament formation by lamins, here we discuss several mechanisms that might alone or in combination participate in the regulation of nuclear shape observed upon modification of the levels of nuclear membrane and lamina proteins. Based on recent work with the two farnesylated nuclear membrane Drosophila proteins, kugelkern and lamin Dm0, we propose that the direct interaction of farnesylated nuclear membrane proteins with the phospholipid bilayer leads to nuclear envelope deformation. In addition to this mechanism, we suggest that the interaction of nuclear membrane and lamina proteins with cytoskeletal elements and chromatin, and modifications in lipid biosynthesis might also be involved in the formation of abnormally shaped nuclei.

Polychronidou, Maria

2011-01-01

121

Nuclear Structure Aspects in Nuclear Astrophysics  

SciTech Connect

Nuclear Astrophysics as a broad and diverse field of study can be viewed as a magnifier of the impact of microscopic processes on the evolution of macroscopic events. One of the primary goals in Nuclear Astrophysics is the understanding of the nucleosynthesis processes that take place in the cosmos and the simulation of the correlated stellar and explosive burning scenarios. These simulations are strongly dependent on the input from Nuclear Physics which sets the time scale for all stellar dynamic processes--from giga-years of stellar evolution to milliseconds of stellar explosions--and provides the basis for most of the signatures that we have for the interpretation of these events--from stellar luminosities, elemental and isotopic abundances to neutrino flux from distant supernovae. The Nuclear Physics input comes through nuclear structure, low energy reaction rates, nuclear masses, and decay rates. There is a common perception that low energy reaction rates are the most important component of the required nuclear physics input; however, in this article we take a broader approach and present an overview of the close correlation between various nuclear structure aspects and their impact on nuclear astrophysics. We discuss the interplay between the weak and the strong forces on stellar time scales due to the limitations they provide for the evolution of slow and rapid burning processes. The effects of shell structure in nuclei on stellar burning processes as well as the impact of clustering in nuclei is outlined. Furthermore we illustrate the effects of the various nuclear structure aspects on the major nucleosynthesis processes that have been identified in the last few decades. We summarize and provide a coherent overview of the impact of all aspects of nuclear structure on nuclear astrophysics.

Smith, Michael Scott [ORNL

2006-12-01

122

Navajo minettes in the Cerros de las Mujeres, New Mexico  

NASA Astrophysics Data System (ADS)

The Cerros de las Mujeres in west-central New Mexico are three mafic minette plugs that should be considered part of the Navajo volcanic fields on the central Colorado Plateau. This newly recognized occurrence extends the Navajo volcanic fields to the southeastern margin of the Colorado Plateau, within 45 km of the extensional tectonic setting in which the Mogollon ash-flow tuff cauldrons occur. The Cerros de las Mujeres provide additional evidence for contemporaneous sodic and potassic volcanism within the Navajo volcanic fields.

Vaniman, D.; Laughlin, A. W.; Gladney, E. S.

1985-06-01

123

Iran's Nuclear Program: Status.  

National Technical Information Service (NTIS)

Although Iran claims that its nuclear programs are exclusively for peaceful purposes, they have generated considerable concern that Tehran is pursuing a nuclear weapons program. Indeed, the UN Security Council has responded to Iran's refusal to suspend wo...

P. K. Kerr

2008-01-01

124

Future of Nuclear Power.  

National Technical Information Service (NTIS)

Present conditions and future prospects for the nuclear power industry in the United States are discussed. The presentation includes a review of trends in electrical production, the safety of coal as compared to nuclear generating plants, the dangers of r...

H. J. Zeile

1987-01-01

125

Prospects for Nuclear Proliferation.  

National Technical Information Service (NTIS)

This study surveys and analyzes various problems relating to the proliferation of nuclear weapons and the future of the nonproliferation regime. Nuclear proliferation is the intersection of a number of important issues, none of which individually will dec...

D. W. Phillips

1983-01-01

126

Mathematics of Nuclear Engineering.  

National Technical Information Service (NTIS)

The mathematics of nuclear engineering is considered with especial reference to the problems of the representation of the transformation of matter at the nuclear level by radioactive decay and neutron transmutation, the problem of the distribution of neut...

J. D. Lewins

1982-01-01

127

Nuclear Terrorism Effects Study.  

National Technical Information Service (NTIS)

In this report we discuss the technical problems associated with predicting the consequences of a nuclear terrorism event, a summary of LLNL capabilities, and some suggested approaches to the problem. The normal method applied to evaluate the nuclear effe...

T. Donich

1983-01-01

128

Triangle Universities Nuclear Laboratory  

SciTech Connect

This report contains brief papers that discusses the following topics: Fundamental Symmetries in the Nucleus; Internucleon Interactions; Dynamics of Very Light Nuclei; Facets of the Nuclear Many-Body Problem; and Nuclear Instruments and Methods.

Not Available

1991-01-01

129

Teaching "The Nuclear Predicament."  

ERIC Educational Resources Information Center

Contends that courses on nuclear war must help students examine the political, social, religious, philosophical, economic, and moral assumptions which characterized the dilemma of nuclear armament/disarmament. Describes the upper level undergraduate course taught by the authors. (JDH)

Carman, Philip; Kneeshaw, Stephen

1987-01-01

130

Nuclear Stress Test  

MedlinePLUS

... rest (left) and during exercise (right) from a nuclear stress test. The dark area shows a location where blood flow is abnormal. A nuclear stress test lets doctors see pictures of your heart while ...

131

Nuclear energy in perspective  

NASA Astrophysics Data System (ADS)

The author offers personal comments on what he feels is the current state of nuclear energy, and forecasts nuclear's role in the future. Touched on are: Three Mile Island; proliferation; and breeder technology.

Trauger, D. B.

1981-09-01

132

Nuclear disarmament verification  

SciTech Connect

Arms control treaties, unilateral actions, and cooperative activities -- reflecting the defusing of East-West tensions -- are causing nuclear weapons to be disarmed and dismantled worldwide. In order to provide for future reductions and to build confidence in the permanency of this disarmament, verification procedures and technologies would play an important role. This paper outlines arms-control objectives, treaty organization, and actions that could be undertaken. For the purposes of this Workshop on Verification, nuclear disarmament has been divided into five topical subareas: Converting nuclear-weapons production complexes, Eliminating and monitoring nuclear-weapons delivery systems, Disabling and destroying nuclear warheads, Demilitarizing or non-military utilization of special nuclear materials, and Inhibiting nuclear arms in non-nuclear-weapons states. This paper concludes with an overview of potential methods for verification.

DeVolpi, A.

1993-12-31

133

Eliminating Nuclear Power.  

National Technical Information Service (NTIS)

A study, initiated by the Swedish Energy Commission, of the possibilities to discontinue the use of nuclear power by year 1985. The report deals with economical, technical and environmental consequences of converting nuclear power stations to coal firing....

T. Nyten R. Johansson

1977-01-01

134

Nuclear stress test  

MedlinePLUS

... Persantine stress test; Thallium stress test; Stress test - nuclear; Adenosine stress test; Regadenoson stress test ... Thallium stress test is a nuclear imaging method that shows how well blood flows into the heart muscle, both at rest and during activity.

135

RBC nuclear scan  

MedlinePLUS

An RBC nuclear scan uses small amounts of radioactive material to mark (tag) red blood cells (RBCs). Your body is then ... radiation -- it does not give off radiation. Most nuclear scans (including an RBC scan) are not recommended ...

136

Nuclear Medicine: Career Information  

MedlinePLUS

... Patients For Healthcare Providers Career Center Career Information Nuclear physicians are usually based in a university or ... and have limited involvement in direct patient care. Nuclear Medicine physicians participate in the intellectual challenge presented ...

137

Nuclear radiation actuated valve  

DOEpatents

A nuclear radiation actuated valve for a nuclear reactor. The valve has a valve first part (such as a valve rod with piston) and a valve second part (such as a valve tube surrounding the valve rod, with the valve tube having side slots surrounding the piston). Both valve parts have known nuclear radiation swelling characteristics. The valve's first part is positioned to receive nuclear radiation from the nuclear reactor's fuel region. The valve's second part is positioned so that its nuclear radiation induced swelling is different from that of the valve's first part. The valve's second part also is positioned so that the valve's first and second parts create a valve orifice which changes in size due to the different nuclear radiation caused swelling of the valve's first part compared to the valve's second part. The valve may be used in a nuclear reactor's core coolant system.

Christiansen, David W. (Kennewick, WA) [Kennewick, WA; Schively, Dixon P. (Richland, WA) [Richland, WA

1985-01-01

138

Russian Nuclear Forces, 2010  

Microsoft Academic Search

With or without a follow-on agreement to START, the number of warheads in the Russian nuclear arsenal continues to shrink. But that doesn't mean Moscow has given up modernizing its strategic nuclear forces.

Robert S. Norris; Hans M. Kristensen

2010-01-01

139

Linking Cooperation and Sustainable Development: The Las Nubes Coffee Partnership  

Microsoft Academic Search

York University, the Tropical Science Center (TSC), and COOPEAGRI, R.L. of Costa Rica and Timothy's World Coffee have formed a unique partnership to advance rural sustainable development in the Las Nubes region of southern Costa Rica. York's Faculty of Environmental Studies (FES) and TSC have promoted the creation of a biological corridor along the Río Peñas Blancas, between the montane

Howard E. Daugherty; Stefanie J. Hall; Paula Pelaez

140

A Community-Based Organization: The Las Mercedes Project  

Microsoft Academic Search

Using the Las Mercedes Project as an example, the aim of this article is to discuss the philosophy and practice of community-based projects. At the core of such projects is a shift in understanding the nature of community. A community, in this case, represents a reality that persons construct that determines the character of rules, norms, and the focus and

John W. Murphy

2012-01-01

141

EFICACIA EN LAS REUNIONES DE ACADEMIAS DE LOS INSTITUTOS TECNOLÓGICOS  

Microsoft Academic Search

La importancia que tienen los grupos de trabajo académicos para alcanzar objetivos que propicien la realización de investigación y desarrollo tecnológico en el Sistema Nacional de Institutos Tecnológicos hace imperativo su buen funcionamiento; de esto depende el poder alcanzar los objetivos o desviarse hacia actividades triviales. En ocasiones se realizan juntas pero no son productivas, con planeación defectuosa de las

Gloria Pérez Garmendia; Francisco Gerardo Barroso Tanoira; Concepción Mánica Zuccolotto

2007-01-01

142

Multiple output selection-LAS algorithm in large MIMO systems  

Microsoft Academic Search

We present a low-complexity algorithm for detection in large MIMO systems based on the likelihood ascent search (LAS) algorithm. The key idea in our work is to generate multiple possible solutions or outputs from which we select the best one. We propose two possible approaches to achieve this goal and both are investigated. Computer simulations demonstrate that the proposed algorithm,

Peng Li; Ross D. Murch

2010-01-01

143

Reading "Las Meninas": An Ekphrastic Approach to Teaching "Don Quijote"  

ERIC Educational Resources Information Center

Reading and teaching "Don Quijote" present multiple challenges to twenty-first century students and instructors who are culturally and historically distanced from the seventeenth century. With "Las Meninas" serving as a visual lexicon for cuing correlative themes and events in "Don Quijote", the instructor, through an ekphrastic, interdisciplinary…

Ortuno, Marian

2012-01-01

144

Thermal expansion in metal/lithia-alumina-silica (LAS) composites  

NASA Astrophysics Data System (ADS)

Lithia-alumina-silica (LAS) with metallic dispersions offers a new approach toward near-zero, isotropic, thermal expansion composites. The metallic phase contributes a positive coefficient of thermal expansion (CTE) to the negative CTE of the glass/ceramic matrix. In addition, the metal will increase the electrical and thermal conductivities over those of the matrix alone. The LAS system offers tailorable negative CTEs and light weight compared to other negative CTE ceramics. The most negative CTE phase is crystalline ?-eucryptite, whose proportion in an initially glassy matrix can be controlled by heat treatment. Dispersed metal powders were both hot-pressed and cold-pressed and sintered together with LAS matrices prepared by sol gel methods. Super Invar powder was studied for its minimal CTE mismatch, while titanium powders offered a compromise between light weight and low CTE. An ultralow-expansion (ULE) glass- and linear variable differential transducer (LVDT)-based differential dilatometer was developed for rapid screening of compositions, while a double-laser Michelson interferometer was used for precise near-zero CTE measurements. The reinforced ?-eucryptite glass/ceramic matrix exhibited both a U-shaped ?L/L curve with temperature and some thermal hysteresis, depending on the fabrication and heat treatment sequences. The temperature of the zero-CTE portion of this curve was found to change with increasing titanium powder content. Results are also given for mixtures of Super Invar powders in ULE glass and ?-eucryptite matrices. Negative CTEs in a LAS matrix above ambient temperatures were more difficult to obtain than below, although the use of petalite (high-silica LAS) appears promising.

Wolff, E. G.

1988-03-01

145

The Tokaimura Nuclear Accident  

NSDL National Science Digital Library

The 1999 accident at the Tokaimura nuclear fuel processing plant near Tokyo is the context for a student discussion on nuclear power and the consequences of a nuclear accident. The case covers issues ranging from chemical process safety to risk management

Ryan, Michael E.

2001-09-01

146

Europe's nuclear dominos  

Microsoft Academic Search

As long as the United States continues to play a leading role in NATO, the incentive for European powers to acquire independent nuclear weapons is virtually zero. Most European power, however, have relatively sophisticated nuclear establishments and could easily manufacture nuclear explosives if they judged that their security required an independent capability. They might judge so if the United States

Sharp

1993-01-01

147

Nuclear fuel lease accounting  

Microsoft Academic Search

The subject of nuclear fuel lease accounting is a controversial one that has received much attention over the years. This has occurred during a period when increasing numbers of utilities, seeking alternatives to traditional financing methods, have turned to leasing their nuclear fuel inventories. The purpose of this paper is to examine the current accounting treatment of nuclear fuel leases

Danielson

1986-01-01

148

Nuclear Merchant Ship Propulsion.  

National Technical Information Service (NTIS)

The operation of about 300 nuclear naval vessels has proven the feasibility of nuclear ship propulsion. Until now six non military ships have been built or are under construction. In the Soviet Union two nuclear icebreakers are in operation, and a third o...

E. Schroeder W. Jager H. G. Schafstall

1977-01-01

149

ABC's of Nuclear Science  

NSDL National Science Digital Library

Produced by the Lawrence Berkeley National Laboratory, the ABC's of Nuclear Science site gives high school students and perhaps even entry-level college students a good general overview of nuclear science. Through descriptions and illustrations, students get to explore nuclear structure; radioactivity; alpha, beta, and gamma decay; half-life; reactions; fusion; fission; cosmic rays; and antimatter.

Noto, Victor

2003-10-31

150

Nuclear energy technology  

NASA Technical Reports Server (NTRS)

An overview of space nuclear energy technologies is presented. The development and characteristics of radioisotope thermoelectric generators (RTG's) and space nuclear power reactors are discussed. In addition, the policy and issues related to public safety and the use of nuclear power sources in space are addressed.

Buden, David

1992-01-01

151

Chinese nuclear forces, 2011  

Microsoft Academic Search

Today, China is the only one of five original nuclear weapon states that is increasing its nuclear arsenal. According to some estimates, the country could “more than double” the number of warheads on missiles that could threaten the United States by the mid-2020s. Earlier this year, China published a defense white paper, which repeated its nuclear policies of maintaining a

Hans M. Kristensen; Robert S. Norris

2011-01-01

152

The plant nuclear envelope  

Microsoft Academic Search

This review summarizes our present knowledge about the composition and function of the plant nuclear envelope. Compared with animals or yeast, our molecular understanding of the nuclear envelope in higher plants is in its infancy. However, fundamental differences in the structure and function of the plant and animal nuclear envelope have already been found. Here, we compare and contrast these

Annkatrin Rose; Shalaka Patel; Iris Meier

2004-01-01

153

Nuclear economics: Issues and facts.  

National Technical Information Service (NTIS)

Nuclear economics has become on the more prominent topics related to nuclear power. Beyond the subjects of nuclear safety and waste disposal, questions and concerns of nuclear power economics have emerged with growing frequency in utility board rooms, in ...

C. R. Hudson

1993-01-01

154

On emerging nuclear order  

PubMed Central

Although the nonrandom nature of interphase chromosome arrangement is widely accepted, how nuclear organization relates to genomic function remains unclear. Nuclear subcompartments may play a role by offering rich microenvironments that regulate chromatin state and ensure optimal transcriptional efficiency. Technological advances now provide genome-wide and four-dimensional analyses, permitting global characterizations of nuclear order. These approaches will help uncover how seemingly separate nuclear processes may be coupled and aid in the effort to understand the role of nuclear organization in development and disease.

Rajapakse, Indika

2011-01-01

155

Nuclear data online  

SciTech Connect

The National Nuclear Data Center (NNDC) Online Data Service, available since 1986, is continually being upgraded and expanded. Most files are now available for access through the World Wide Web. Bibliographic, experimental, and evaluated data files are available containing information no neutron, charged-particle, and photon-induced nuclear reaction data, as well as nuclear decay and nuclear structure information. An effort is being made through the world-wide Nuclear Reaction Data Centers collaboration to make the charged-particle reaction data libraries as complete as possible. The data may be downloaded or viewed both as plots or as tabulated data. A variety of output formats are available for most files.

McLane, V.

1997-12-31

156

Offsite environmental monitoring report. Radiation monitoring around United States nuclear test areas, calendar year 1983  

Microsoft Academic Search

This report covers the routine radiation monitoring activities conducted by the Environmental Monitoring Systems Laboratory-Las Vegas in areas which may be affected by nuclear testing programs of the Department of Energy. This monitoring is conducted to document compliance with standards, to identify trends in environmental radiation, and to provide such information to the public. It summarizes these activities for calendar

R. G. Patzer; S. C. Black; R. F. Grossman; D. D. Smith

1984-01-01

157

Geophysical Studies of the Las Vegas Urban Corridor  

NSDL National Science Digital Library

The Geophysical Studies of the Las Vegas Urban Corridor Area are part of an integrated effort to "geologically characterize the seismic hazards, water resources, and crustal structure of this rapidly growing urban corridor" by the USGS. The informational Web site contains a gravity map of the Las Vegas region, an aeromagnetic map, and a publications link with a list of over a dozen references. Seven of these publications are freely available for download with titles such as "Aeromagnetic Survey of the Amargosa Desert," "Nevada and California: A Tool for Understanding Near-Surface Geology," and Hydrology and Principal Facts for Gravity Stations in the Vicinity of Coyote Spring Valley, Nevada, with Initial Gravity Modeling Results." An interesting collection of unique resources, the site should be of interest to professionals in a wide variety of fields.

2001-01-01

158

Las líneas de aluminio neutro como diagnóstico cromosférico  

NASA Astrophysics Data System (ADS)

Se presenta un modelo atómico para el cálculo de las lí neas del Aluminio neutro que se forman en la cromósfera solar. En particular, se estudia la línea ? 3961 Å, que, por estar muy próxima a la lí nea H del Ca II y a H? es muy frecuentemente observada. Observaciones en esta lí nea obtenidas con el espectrógrafo a instalarse en el CASLEO, serán utilizadas para el estudio de fulguraciones solares.

Fernández Borda, R.; Mauas, P. J. D.

159

Performance of LAS-CDMA system using smart antenna  

Microsoft Academic Search

The choice of CDMA spreading sequences predetermines the properties of the system. The properties of large area synchronous (LAS) CDMA system have been demonstrated an interference free window (IFW) compared to traditional CDMA systems. This IFW property, however, has a limited delay-offset range. It is not always possible that all the channel-induced multipath delay spread components arrives within IFW delay-offset

C. K. Ng; B. M. Ali; S. Khatun; S. S. Jamuar; M. Ismail

2005-01-01

160

Solar hot water system installed at Las Vegas, Nevada  

NASA Technical Reports Server (NTRS)

A solar energy hot water system installed in a motor inn at Las Vegas, Nevada is described. The inn is a three story building with a flat roof for installation of the solar panels. The system consists of 1,200 square feet of liquid flat plate collectors, a 2,500 gallon insulated vertical steel storage tank, two heat exchangers, and pumps and controls. The system was designed to supply approximately 74 percent of the total hot water load.

1981-01-01

161

British nuclear policymaking  

SciTech Connect

This study analyzes the domestic political, economic, and bureaucratic factors that affect the nuclear policymaking process in Great Britain. Its major conclusion is that, although there have been changes in that process in recent years (notably the current involvement of a segment of the British public in the debate about the deployment of intermediate-range nuclear forces), future British nuclear policymaking will remain much what it has been in the past. Three ideas are central to understanding British thinking on the subject: (1) Britain's long-standing resolve to have her own national nuclear force is largely traceable to her desire to maintain first-rank standing among the nations of the world in spite of loss of empire. (2) Financial considerations have always been important--so much so that they have usually dominated issues of nuclear policy. (3) The executive branch of government dominates the nuclear policymaking process but does not always present a united front. The United States heavily influences British nuclear policy through having supplied Britain since the late 1950s with nuclear data and components of nuclear weapon systems such as Polaris and Trident. The relationship works both ways since the U.S. depends on Britain as a base for deployment of both conventional and nuclear systems.

Bowie, C.J.; Platt, A.

1984-01-01

162

Source Water Assessment for the Las Vegas Valley Surface Waters  

NASA Astrophysics Data System (ADS)

The 1996 amendment to the Safe Drinking Water Act of 1974 created the Source Water Assessment Program (SWAP) with an objective to evaluate potential sources of contamination to drinking water intakes. The development of a Source Water Assessment Plan for Las Vegas Valley surface water runoff into Lake Mead is important since it will guide future work on source water protection of the main source of water. The first step was the identification of the watershed boundary and source water protection area. Two protection zones were delineated. Zone A extends 500 ft around water bodies, and Zone B extends 3000 ft from the boundaries of Zone A. These Zones extend upstream to the limits of dry weather flows in the storm channels within the Las Vegas Valley. After the protection areas were identified, the potential sources of contamination in the protection area were inventoried. Field work was conducted to identify possible sources of contamination. A GIS coverage obtained from local data sources was used to identify the septic tank locations. Finally, the National Pollutant Discharge Elimination System (NPDES) Permits were obtained from the State of Nevada, and included in the inventory. After the inventory was completed, a level of risk was assigned to each potential contaminating activity (PCA). The contaminants of concern were grouped into five categories: volatile organic compounds (VOCs), synthetic organic compounds (SOCs), inorganic compounds (IOCs), microbiological, and radionuclides. The vulnerability of the water intake to each of the PCAs was assigned based on these five categories, and also on three other factors: the physical barrier effectiveness, the risk potential, and the time of travel. The vulnerability analysis shows that the PCAs with the highest vulnerability rating include septic systems, golf courses/parks, storm channels, gas stations, auto repair shops, construction, and the wastewater treatment plant discharges. Based on the current water quality data (prior to treatment), the proximity of Las Vegas Wash to the intake, and the results of the vulnerability analysis of potential contaminating activities, it is determined that the drinking water intake is at a Moderate level of risk for VOC, SOC, and microbiological contaminants. The drinking water intake is at a High level of risk for IOC contaminants. Vulnerability to radiological contamination is Moderate. Source water protection in the Las Vegas Valley is strongly encouraged because of the documented influence of the Las Vegas Wash on the quality of the water at the intake.

Albuquerque, S. P.; Piechota, T. C.

2003-12-01

163

Nuclear Files Archive  

NSDL National Science Digital Library

A project of the Nuclear Age Peace Foundation, this site offers a wealth of materials concerning nuclear weapons and nuclear war, including links to the full text of numerous important documents and treaties. Site contents include a wide variety of articles on various nuclear issues, links to data and graphs, a photo gallery, links to images of nuclear sites, teacher resources, a glossary, and related links. Of special interest is a side-by-side comparison of the first and final drafts of the exhibit script for the National Air and Space Museum exhibit that was planned but cancelled: The Last Act: The Atomic Bomb and the End of World War II. Numerous links are provided throughout the site to related online and print publications and other resources. While not the most attractive site and downright cluttered in some areas, the Nuclear Files Archive offers a good deal of information for users who don't mind digging around a bit.

164

The Plant Nuclear Envelope  

Microsoft Academic Search

The nuclear envelope is an important but poorly studied dynamic membrane system in plants. In particular, surprisingly little\\u000a is known about the proteins of the higher plant nuclear envelope and their interactions. While structurally similar to the\\u000a nuclear envelope of other kingdoms, unique properties suggest significant differences. For instance, plants lack sequence\\u000a homologues of the lamins and instead of centrosomes

David E. Evans; Sarah L. Irons Katja Graumann; John Runions

165

Nuclear imaging in pediatrics  

SciTech Connect

The author's intent is to familiarize practicing radiologists with the technical aspects and interpretation of nuclear medicine procedures in children and to illustrate the indications for nuclear medicine procedures in pediatric problems. Pediatric doses, dosimetry, sedation, and injection techniques, organ systems, oncology and infection, testicular scanning and nuclear crystography, pediatric endocrine and skeletal systems, ventilation and perfusion imaging of both congenital and acquired pediatric disorders, cardiovascular problems, gastrointestinal, hepatobiliary, reticuloendothelial studies, and central nervous system are all topics which are included and discussed.

Siddiqui, A.R.

1985-01-01

166

Nuclear fuel management  

Microsoft Academic Search

Getting top value from nuclear fuel means combining the latest fuel-assembly technologies with the industry`s best practices in managing refueling outages. Prospects for the future viability of uranium as a source of electrical power continue to focus on the fuel source itself. Unlike fossil-fired powerplants, nuclear fuel economics are governed principally by two factors: design details of the nuclear fuel

Strauss

1996-01-01

167

Nuclear transport mechanisms  

Microsoft Academic Search

:   The term nuclear transport, refers to the movement of a large variety of macromolecules both into and out of the nucleus.\\u000a Transport must be extremely selective, yet also very efficient. A single type of channel, the nuclear pore complex, mediates\\u000a all movement across the nuclear envelope. Selectivity is achieved through the use of families of soluble factors that target

B. B. Quimby; A. H. Corbett

2001-01-01

168

Absolute nuclear material assay  

DOEpatents

A method of absolute nuclear material assay of an unknown source comprising counting neutrons from the unknown source and providing an absolute nuclear material assay utilizing a model to optimally compare to the measured count distributions. In one embodiment, the step of providing an absolute nuclear material assay comprises utilizing a random sampling of analytically computed fission chain distributions to generate a continuous time-evolving sequence of event-counts by spreading the fission chain distribution in time.

Prasad, Manoj K. (Pleasanton, CA); Snyderman, Neal J. (Berkeley, CA); Rowland, Mark S. (Alamo, CA)

2012-05-15

169

Absolute nuclear material assay  

DOEpatents

A method of absolute nuclear material assay of an unknown source comprising counting neutrons from the unknown source and providing an absolute nuclear material assay utilizing a model to optimally compare to the measured count distributions. In one embodiment, the step of providing an absolute nuclear material assay comprises utilizing a random sampling of analytically computed fission chain distributions to generate a continuous time-evolving sequence of event-counts by spreading the fission chain distribution in time.

Prasad, Manoj K. (Pleasanton, CA) [Pleasanton, CA; Snyderman, Neal J. (Berkeley, CA) [Berkeley, CA; Rowland, Mark S. (Alamo, CA) [Alamo, CA

2010-07-13

170

Ongoing Space Nuclear Activities  

NASA Technical Reports Server (NTRS)

Most ongoing US activities related to space nuclear power and propulsion are sponsored by NASA. NASA-spons0red space nuclear work is currently focused on evaluating potential fission surface power (FSP) systems and on radioisotope power systems (RPS). In addition, significant efforts related to nuclear thermal propulsion (NTP) systems have been completed and will provide a starting point for potential future NTP work.

Houts, Michael G.

2007-01-01

171

Chinese nuclear forces, 2010  

Microsoft Academic Search

The authors write about China’s nuclear arsenal, one known for its obscure and opaque nuclear delivery systems and even more inscrutable nuclear weapons storage and production. Despite the secrecy, the authors are able to present an inventory of the country’s land-based missiles, submarines and sea-based missiles, aircraft, cruise missiles, and provide information on the nation’s warhead storage and production.

Robert S. Norris; Hans M. Kristensen

2010-01-01

172

[Nuclear News -- Power  

SciTech Connect

The topics discussed in this section are: (1) NU(Northeast Utilities) receives largest court fine levied for false records. (2) ComEd nuclear fleet has best-ever performance. (3) Perry and Beaver Valley now run by First Energy Nuclear. (4) Slight reactor power increases may save dollars; (5) Nuclear plants shares to change hands. (6) Y2K nonsafety-related work scheduled for completion. (7) New NRC plan for reviewing plant license transfers with foreign ownership.

NONE

1999-11-01

173

Instantánea de los cánceres de hígado y de las vías biliares  

Cancer.gov

Información sobre las tendencias de incidencia, mortalidad y financiamiento del NCI sobre los cánceres de hígado y de las vías biliares; así como ejemplos de actividades del NCI y adelantos en la investigación de estos tipos de cáncer.

174

Landsat-D Assessment System Library Computer Compatible Tape (Laslib-Cct/Las-Cct).  

National Technical Information Service (NTIS)

The format for computer compatible tapes containing thematic mapper archival data and product data generated by the LANDSAT-D Assessment System (LAS). These data tapes are engineering products developed primarily for LAS internal use to assist in the earl...

1982-01-01

175

Nuclear criticality safety guide  

SciTech Connect

This technical reference document cites information related to nuclear criticality safety principles, experience, and practice. The document also provides general guidance for criticality safety personnel and regulators.

Pruvost, N.L.; Paxton, H.C. [eds.] [eds.

1996-09-01

176

The Nuclear Industry.  

National Technical Information Service (NTIS)

Content: Raw fuel materials; Materials processing and fabrication; Nuclear components and equipment; Reactors; Radioisotopes; Materials reprocessing; Plowshare; Services; Assistance for industry at AEC field offices. (Author)

1966-01-01

177

Percepción de las redes sociales en la escuela: colegio Felipe Palazon (Tarija – Bolivia)  

Microsoft Academic Search

No hay duda que desde hace mucho las tecnologías de la información y comunicación, asi como internet, tienen un crecimiento exponencial sin límites en todo el mundo, por las múltiples aplicaciones, y aporte en todos los ámbitos profesionales, lo mismo ocurre con el fenómeno de las redes sociales. En Bolivia y, específicamente en la ciudad de Tarija, siguen esta tendencia;

Carmelo Branimir España Villegas

2011-01-01

178

Los medios de comunicación y las violaciones de los derechos humanos en el área de conflicto  

Microsoft Academic Search

La autora, que actualmente es una refugiada política en Austria, relata su trabajo como periodista palestina en las áreas conflictivas de Israel. Sus experiencias revelan las violaciones de Derechos Humanos y el genocidio cometido por las fuerzas armadas israelíes. Este artículo no sólo condena al estado de Israel sino que también cuestiona la falta de compromiso de los Estados Unidos

Kawther Salam

2006-01-01

179

Language Assessment Scales, LAS I, for Grades K-5, English/Spanish. Second Edition.  

ERIC Educational Resources Information Center

Language Assessment Scales, LAS I, are designed for children in grades K-5. LAS I accommodates ethnic and linguistic differences and provides direct language activities taken from the popular culture of both English- and Spanish-speaking peoples. LAS I consists of two independent tests, one in English and the other in Spanish, presented largely on…

De Avila, Edward A.; Duncan, Sharon E.

180

La donación cadavérica y su repercusión en las familias donantes mexicanas  

Microsoft Academic Search

La muerte encefálica se asocia a donación de órganos. Sin embargo, las distintas repercusiones que este proceso tiene en las familias donantes no han sido bien estudiadas1. Por otro lado, tampoco sabemos hasta donde el diagnóstico de muerte encefálica es bien comprendido por los afectados. Por tal motivo desarrollamos este trabajo cuyo objetivo principal es censar las distintas afecciones que

Cruz Netza Cardoso; M. de la Luz Casas Martínez; Hugo Ramírez García

2010-01-01

181

Q DE TOBIN Y GOBIERNO CORPORATIVO DE LAS EMPRESAS LISTADAS EN BOLSA  

Microsoft Academic Search

El trabajo evalúa el estado de las prácticas de gobierno corporativo en las empresas que negocian acciones ordinarias en la Bolsa de Colombia. Esta tarea se lleva a cabo mediante la construcción de un Índice de Gobierno Corporativo construido con información pública. Por otra parte se mide el impacto que las buenas prácticas de gobierno corporativo tienen sobre la relación

Andrés Langebaek; Jaime Eduardo Ortíz

2007-01-01

182

Los hechos regionales, base para las estructuras de gobierno en la ciudad-región de Medellín  

Microsoft Academic Search

La fusión urbana de los municipios del Área Metropolitana de Medellín, asociada al mejoramiento de las infraestructuras que la conectan con el oriente y occidente cercanos, han cambiado la realidad urbana, regional, social y económica. Sin embargo, las respuestas públicas a los fenómenos de la conurbación y a las dinámicas campo-ciudad siguen siendo respuestas municipalistas y fuertemente determinadas por la

Luis Fernando Agudelo Henao

2006-01-01

183

Reflexiones sobre el buen gobierno corporativo en las empresas periodõ ´sticas  

Microsoft Academic Search

Resumen: El interes por el gobierno corporativo en las empresas informativas no es un tema nuevo, pero ha adquirido singular relevancia en los ultimos anos, como resultado de las transformaciones que se han vivido en los esquemas de propiedad y de gestion de las compan ˜õ ´as. En este artõ ´culo se trata de explicar por quela naturaleza de los

Angel Arrese

184

Linfadenomegalia superficial (LAS): Correlato clínico patológico en 154 pacientes del Hospital Nacional Cayetano Heredia, Lima, Perú  

Microsoft Academic Search

Introducción: la linfadenomegalia superficial (LAS) son hallazgos clínicos frecuentes en la práctica médica que pueden ser las primeras manifestaciones de una enfermedad de trascendencia o de un síndrome clínico específico. Objetivo: realizar un correlato clínico-patológico en pacientes con LAS que acudieron por primera vez a la consulta médica sin un diagnóstico conocido. Materiales y Métodos: estudio prospectivo transversal en el

Fernando Osores Plenge; Raúl Gutiérrez Rodríguez; Oscar Guerra Amaya; Juan Cortez-Escalante; Juan C. Ferrufino Lach; Leandro Huayanay; Isaias Rodríguez; Betty Bustamante; Ciro Maguiña Vargas

2007-01-01

185

William Stanley Jevons: el uso de las probabilidades y el cálculo  

Microsoft Academic Search

En el capítulo tercero de la TPE, Jevons recurre al uso de las probabilidades como un método alternativo para analizar el intercambio de las mercancías. Jevons, decide no continuar con el uso de las probabilidades en los capítulos siguientes; su teoría se bifurca imperando el uso del cálculo diferencial. La explicación de esta bifurcación radica en la existencia de dos

John James Mora

2000-01-01

186

Las certificaciones ISO 9001\\/2000 e ISO 14001\\/96 en Colombia  

Microsoft Academic Search

Las certificaciones en sistemas de gestión de la calidad NTC ISO 9001\\/2000 y sistemas de gestión ambiental NTC ISO 14001\\/96, se han convertido en una prioridad para muchas organizaciones por las exigencias del mercado. Se presentan los resultados de un análisis cuantitativo de las empresas públicas y privadas del país que han optado por la certificación en sistemas de gestión

Clara Inés Pardo Martínez

2006-01-01

187

Nuclear economics: Issues and facts  

Microsoft Academic Search

Nuclear economics has become on the more prominent topics related to nuclear power. Beyond the subjects of nuclear safety and waste disposal, questions and concerns of nuclear power economics have emerged with growing frequency in utility board rooms, in state and federal regulatory proceedings, and in the media. What has caused nuclear power economics to become such a popular topic?

1993-01-01

188

Nuclear Energy and the Environment.  

ERIC Educational Resources Information Center

"Nuclear Energy and the Environment" is a pocket folder of removable leaflets concerned with two major topics: Nuclear energy and Nuclear Techniques. Under Nuclear Energy, leaflets concerning the topics of "Radiation--A Fact of Life,""The Impact of a Fact: 1963 Test Ban Treaty,""Energy Needs and Nuclear Power,""Power Reactor Safety,""Transport,"…

International Atomic Energy Agency, Vienna (Austria).

189

Countering the Nuclear Terrorist Threat  

Microsoft Academic Search

The nuclear\\/radioactive threat to homeland security posed by terrorists can be broken into four categories. Of highest concern is the use of an improvised nuclear device (IND). An IND, as its name implies, is a nuclear explosive device. It produces nuclear yield, and this nuclear yield has catastrophic effects. An IND is the ultimate terrorist weapon, and terrorist groups are

Vantine

2002-01-01

190

Nuclear information services at the National Nuclear Data Center.  

National Technical Information Service (NTIS)

The numeric and bibliographic nuclear data bases maintained by the National Nuclear Data Center and access to these data bases will be described. The U.S. Nuclear Data and Reaction Data Networks will also be briefly described.

T. W. Burrows J. K. Tuli

1996-01-01

191

Nuclear cratering. Technical report  

Microsoft Academic Search

This report describes an investigation of crater formation by nuclear surface bursts; early time processes (radiation and hydrodynamics) and scaling laws are emphasized. We have not attempted a complete theoretical or experimental review of nuclear cratering. Rather this report is intended to be a simple presentation of the important physical processes involved in cratering along with their spatial and temporal

H. M. Foley; J. I. Katz; J. D. Sullivan

1980-01-01

192

Nuclear cratering. Technical report  

SciTech Connect

This report describes an investigation of crater formation by nuclear surface bursts; early time processes (radiation and hydrodynamics) and scaling laws are emphasized. We have not attempted a complete theoretical or experimental review of nuclear cratering. Rather this report is intended to be a simple presentation of the important physical processes involved in cratering along with their spatial and temporal scales.

Foley, H.M.; Katz, J.I.; Press, W.H.; Sullivan, J.D.

1980-06-01

193

Nuclear physics and cosmology  

NASA Astrophysics Data System (ADS)

There are important aspects of Cosmology, the scientific study of the large scale properties of the universe as a whole, for which nuclear physics can provide insights. Here, we will focus on Standard Big-Bang Nucleosynthesis and we refer to the previous edition of the School [1] for the aspects concerning the variations of constants in nuclear cosmo-physics.

Coc, Alain

2014-05-01

194

Clinical Nuclear Pharmacy Clerkship  

ERIC Educational Resources Information Center

The School of Pharmacy, University of the Pacific, and the Pharmacy Service, Letterman Army Medical Center, initiated a 15-week clinical nuclear pharmacy clerkship in 1975. It includes basic nuclear medical science, technical competency, professional competency, and special interest emphasis. (LBH)

Dunson, George L.; Christopherson, William J., Jr.

1977-01-01

195

Nuclear effects at HERA  

SciTech Connect

The development of a nuclear beam facility at HERA would allow the study of fundamental features of quark and gluon interactions in QCD. I briefly review the physics underlying nuclear shadowing and anti-shadowing as well as other diffractive and jet fragmentation processes that can be studies in high energy electron-nucleus collisions.

Brodsky, S.J.

1996-07-01

196

Nuclear Power in Brazil.  

National Technical Information Service (NTIS)

To the present time, only the United States, the Soviet Union, the United Kingdom, France, China, India, and possibly Israel have acquired nuclear weapons. But it is only a matter of time before additional countries join this nuclear club. The prospect of...

M. G. Manwaring

1984-01-01

197

Nuclear politics in Sweden  

Microsoft Academic Search

Political problems have plagued nuclear development in Sweden, which imports 75% of its energy and all of its uranium even though it has 12% of the world's known U reserves. Communities have consistently vetoed mining projects, and a 1973 moratorium on nuclear power was passed pending a thorough study and creating an atmosphere that has been directly responsible for the

Abrams

1979-01-01

198

Nuclear power economics  

Microsoft Academic Search

Since nuclear units have a lower fuel cost than other thermal units, they will be operated on base load at their first stage of development. In this simple but current case, an approximate economic evaluation may consist in comparing total generation costs (including capital, operation and fuel costs) between different power plants (nuclear, coal-fired or oil fired) providing a same

Moynet

1988-01-01

199

NUCLEAR TANKER ECONOMICS  

Microsoft Academic Search

Useful information relative to nuclear tanker costs is presented. The ; estimation of probable upper and lower limits for the various operating costs ; such as crew wages, presented in detail, show methods by which the data can be ; put to use in nuclear tanker cost studies. (M.H.R.);

1957-01-01

200

Nuclear Fuel Accounting.  

National Technical Information Service (NTIS)

After a nuclear power plant has started commercial operation the actual nuclear fuel costs have to be demonstrated in the rate making procedure. For this purpose an accounting system has to be developed which comprises the following features: 1) All costs...

D. E. Aisch

1977-01-01

201

Reducing the nuclear danger  

SciTech Connect

The proliferation of weapons of mass destruction represents a major challenge to our national security. Reducing the nuclear danger is one of the primary goals of the United States national security strategy and it is a cornerstone of the Department`s vision of the future. To meet this challenge, our Nation draws upon the same foundation of scientific and technological skills that helped bring a successful end to the Gold War. The Department, drawing upon many of the Nation`s best and most innovative scientists, provides essential support for the changing global political climate that has guided the Department`s adaptation to the new era. Reducing the global nuclear danger, responding with programs that build upon and enhance the strengths of the Department`s complex and the National Laboratories, and emphasizing commitments to environment, safety, and health, are the essence of the Department`s national security strategy. The nuclear danger is now defined differently than it was just five years ago. Initiatives to prevent nuclear weapons proliferation, improve nuclear reactor safety, safeguard and dispose of nuclear materials and maintain confidence in our nuclear weapons deterrent without nuclear testing have surged to the forefront.

NONE

1995-10-01

202

Nuclear Molecular Structure  

NASA Astrophysics Data System (ADS)

The concept of a nuclear molecule or a dinuclear system assumes two touching nuclei which carry out motion in the internuclear distance and exchange nucleons by transfer. The dinuclear model can be applied to nuclear structure, to fusion reactions leading to superheavy nuclei and to multi-nucleon transfer reactions.

Adamian, G. G.; Antonenko, N. V.; Gagyi-Palffy, Z.; Ivanova, S. P.; Jolos, R. V.; Palchikov, Yu. V.; Scheid, W.; Shneidman, T. M.; Zubov, A. S.

2007-04-01

203

Technocrats and nuclear politics  

Microsoft Academic Search

This book arrives in an age of growing unease and dissatisfaction with the reassurances, by the nuclear power industry, of the safety of its power stations. The book's central purpose is to examine the motivations and varied perceptions which have laid the foundation for Britain's contemporary civil nuclear industry. The author pays particular attention to the role and influence of

Massey

1988-01-01

204

The British nuclear deterrent  

SciTech Connect

A detailed analysis is given of the development of British nuclear weapons and defense policy since 1940. Malone traces the British commitment to an independent nuclear deterrent from the decisions of the Atlee and Macmillan governments regarding the hydrogen bomb and Polaris program through to the recent Trident decision, stressing throughout the background of British domestic politics and Anglo-American relations.

Malone, P.

1984-01-01

205

Nuclear Waste Land  

Microsoft Academic Search

The nuclear power industry needs a coherent plan for dealing with its reactors' radioactive and toxic leftovers. Burying the waste is a slow, politically painful process that leaves much to be desired. Lately, nuclear advocates, particularly in the United States, say they've found a better solution, or at least a path to one. It's based on the recycling and reuse

Peter Fairley

2007-01-01

206

Nuclear Science References (NSR)  

NSDL National Science Digital Library

This database contains references to low and intermediate energy physics research publications listed in the Nuclear Science Reference (NSR) Data File at the National Nuclear Data Center, Brookhaven National Laboratory. Users can search via nuclide, target, incident particle, outgoing particle, reaction, author, keynumber list, subject or quantity. Links to abstracts from the American Physical Society are provided.

2004-04-16

207

Gaseous Nuclear Rocket.  

National Technical Information Service (NTIS)

The nuclear rocket for extraterrestrial flight is in the form of a gaseous nuclear reactor. One or more streams of a working fluid are introduced concentrically adjacent to a gaseous fissile material in a heating chamber or cell. Introduction of a working...

F. E. Rom

1965-01-01

208

Nuclear Pulse Propulsion  

Microsoft Academic Search

A general technical description and programmatic review of nuclear pulse propulsion activities over the last decade is presented. Major problem areas are reviewed together with the status of current research efforts. Sufficient technical information is now available to predict achievable propulsion systems performance with a rather high degree of confidence based on current materials and nuclear technology. Expected performance is

J. C. Nance

1965-01-01

209

Korean Nuclear Fuel Program  

Microsoft Academic Search

In Korea, ten PWR and two CANDU reactors are in operation, six PWRs and two CANDUs are under construction, and eight more nuclear power plants are scheduled to be built by 2010. Two PWRs will also be built in North Korea. Ten operating PWRs comprise of eight Westinghouse type reactors and two ABB CE type reactors. Korea Nuclear Fuel Company

Chang Saeng RIM

1998-01-01

210

Radionuclides and Nuclear Waste  

NSDL National Science Digital Library

This resource is a 9-page PDF document that is part of an environmental geochemistry course taught by Dr. David Sherman at the University of Bristol. Topics covered include uranium, strontium, radon, and cesium geochemistry, radioactive decay, sources and uses of nuclear fuel, actinide geochemistry, and the composition of and problems associated with nuclear waste. Informative diagrams accompany the text.

Sherman, David M.; Bristol, University O.

211

Safety of Nuclear Power  

Microsoft Academic Search

The main questions related to nuclear power development concern effects of small radiation doses typical for the operation of nuclear power plants (NPPs) and hazards of NPP accidents. The last decade has brought many results of large scale epidemiological studies indicating that there are no detrimental effects of low radiation doses. On the contrary, many results indicate that among the

J M Hendrie

1976-01-01

212

Nuclear energy related research  

NASA Astrophysics Data System (ADS)

The annual Research Program Plan describes publicly funded nuclear energy related research to be carried out mainly at the Technical Research Center of Finland (VTT) in 1992. The research is financed primarily by the Ministry of Trade and Industry (KTM), the Finnish Center for Radiation and Nuclear Safety (STUK), and VTT itself. Other research institutes, utilities, and industry also contribute to many projects.

Rintamaa, R.

1992-05-01

213

Vertical nuclear proliferation.  

PubMed

All the nuclear-weapon states are working to develop new nuclear-weapon systems and upgrade their existing ones. Although the US Congress has recently blocked further development of small nuclear weapons and earth-penetrating nuclear weapons, the United States is planning a range of new warheads under the Reliable Replacement Warhead programme, and renewing its nuclear weapons infrastructure. The United Kingdom is spending 1 billion pounds sterling on updating the Atomic Weapons Establishment at Aldermaston, and about 20 billion pounds sterling on replacing its Vanguard submarines and maintaining its Trident warhead stockpile. The US has withdrawn from the Anti-Ballistic Missile Treaty and plans to install missile defence systems in Poland and the Czech Republic; Russia threatens to upgrade its nuclear countermeasures. The nuclear-weapon states should comply with their obligations under Article VI of the Non-Proliferation Treaty, as summarised in the 13-point plan agreed at the 2000 NPT Review Conference, and they should negotiate a Nuclear Weapons Convention. PMID:17987977

Sidel, Victor W

2007-01-01

214

Russian nuclear forces, 2011  

Microsoft Academic Search

With Russia’s ratification of New START in January 2011 comes a commitment to bilateral nuclear reductions. With a 2018 deadline as the goal, the treaty sets out to limit the number of deployed strategic nuclear warheads and the number of deployed ballistic missiles and heavy bombers. But, the authors write, there are other numbers to watch—those that are not limited

Hans M. Kristensen; Robert S. Norris

2011-01-01

215

Fissionable nuclear fuel composition  

Microsoft Academic Search

This patent describes a fissionable nuclear composition for service in a nuclear reactor fuel core consisting essentially of a ceramic body of fissionable oxide fuel material selected from the group. It consists of uranium oxides, plutonium oxide and thorium oxides, and mixtures thereof, and containing dispersed throughout the ceramic body of fissionable oxide fuel material at least one boron depletable

R. A. Proebstle; M. O. Marlowe; A. P. Reese

1991-01-01

216

Nuclear physics: Macroscopic aspects  

SciTech Connect

A systematic macroscopic, leptodermous approach to nuclear statics and dynamics is described, based formally on the assumptions {h_bar} {yields} 0 and b/R << 1, where b is the surface diffuseness and R the nuclear radius. The resulting static model of shell-corrected nuclear binding energies and deformabilities is accurate to better than 1 part in a thousand and yields a firm determination of the principal properties of the nuclear fluid. As regards dynamics, the above approach suggests that nuclear shape evolutions will often be dominated by dissipation, but quantitative comparisons with experimental data are more difficult than in the case of statics. In its simplest liquid drop version the model exhibits interesting formal connections to the classic astronomical problem of rotating gravitating masses.

Swiatecki, W.J.

1993-12-01

217

Nuclear illusion and reality  

SciTech Connect

Lord Zuckerman describes how we can extricate ourselves from nuclear dread. Reviewing the history, technology, the strategies and threats of nuclear weaponry, he argues that the inability to unlearn how to split the atom does not mean there is either sanity or safety in further stockpiling or refining of nuclear weapons. He challenges our beliefs that the use of tactical nuclear weapons in Europe cannot be kept from excalating, our fear of sudden superweapons and defenses, and the premise that scientists, technologists, and arms makers should keep the race going rather than the military because of their vested interests. Given the political will, he contends, a comprehensive ban should not be a difficult treaty to agree to, although efforts to slow down the nuclear arms race have been admittedly disappointing. 92 references.

Zuckerman, S.

1982-01-01

218

Destination: inner nuclear membrane.  

PubMed

The inner nuclear membrane (INM) of eukaryotic cells is enriched in proteins that are required for nuclear structure, chromosome organization, DNA repair, and transcriptional control. Mislocalization of INM proteins is observed in a wide spectrum of human diseases; however, the mechanism by which INM proteins reach their final destination is poorly understood. In this review we discuss how investigating INM composition, dissecting targeting pathways of conserved INM proteins in multiple systems and analyzing the nuclear transport of viruses and signaling complexes have broadened our knowledge of INM transport to include both nuclear pore complex-dependent and -independent pathways. The study of these INM targeting pathways is important to understanding nuclear organization and in both normal and diseased cells. PMID:24268652

Katta, Santharam S; Smoyer, Christine J; Jaspersen, Sue L

2014-04-01

219

US nuclear weapons policy  

SciTech Connect

We are closing chapter one'' of the nuclear age. Whatever happens to the Soviet Union and to Europe, some of the major determinants of nuclear policy will not be what they have been for the last forty-five years. Part of the task for US nuclear weapons policy is to adapt its nuclear forces and the oganizations managing them to the present, highly uncertain, but not urgently competitive situation between the US and the Soviet Union. Containment is no longer the appropriate watchword. Stabilization in the face of uncertainty, a more complicated and politically less readily communicable goal, may come closer. A second and more difficult part of the task is to deal with what may be the greatest potential source of danger to come out of the end of the cold war: the breakup of some of the cooperative institutions that managed the nuclear threat and were created by the cold war. These cooperative institutions, principally the North Atlantic Treaty Organization (NATO), the Warsaw Pact, the US-Japan alliance, were not created specifically to manage the nuclear threat, but manage it they did. A third task for nuclear weapons policy is that of dealing with nuclear proliferation under modern conditions when the technologies needed to field effective nuclear weapons systems and their command and control apparatus are ever more widely available, and the leverage over some potential proliferators, which stemmed from superpower military support, is likely to be on the wane. This paper will make some suggestions regarding these tasks, bearing in mind that the unsettled nature of that part of the world most likely to become involved in nuclear weapons decisions today must make any suggestions tentative and the allowance for surprise more than usually important.

May, M.

1990-12-05

220

The Nuclear Pore Complex and Nuclear Transport  

PubMed Central

Internal membrane bound structures sequester all genetic material in eukaryotic cells. The most prominent of these structures is the nucleus, which is bounded by a double membrane termed the nuclear envelope (NE). Though this NE separates the nucleoplasm and genetic material within the nucleus from the surrounding cytoplasm, it is studded throughout with portals called nuclear pore complexes (NPCs). The NPC is a highly selective, bidirectional transporter for a tremendous range of protein and ribonucleoprotein cargoes. All the while the NPC must prevent the passage of nonspecific macromolecules, yet allow the free diffusion of water, sugars, and ions. These many types of nuclear transport are regulated at multiple stages, and the NPC carries binding sites for many of the proteins that modulate and modify the cargoes as they pass across the NE. Assembly, maintenance, and repair of the NPC must somehow occur while maintaining the integrity of the NE. Finally, the NPC appears to be an anchor for localization of many nuclear processes, including gene activation and cell cycle regulation. All these requirements demonstrate the complex design of the NPC and the integral role it plays in key cellular processes.

Wente, Susan R.; Rout, Michael P.

2010-01-01

221

Student Reactions to Nuclear Education.  

ERIC Educational Resources Information Center

Reports on a study that focused on the psychological impact of nuclear education curriculum on middle school students. Concluded that instruction about nuclear issues rarely increases students' fear or worry about nuclear war. (RT)

Christie, Daniel J.; Nelson, Linden

1988-01-01

222

Evaluated nuclear structure data file.  

National Technical Information Service (NTIS)

The Evaluated Nuclear Structure Data File (ENSDF) contains the evaluated nuclear properties of all known nuclides. These properties are derived both from nuclear reaction and radioactive decay measurements. All experimental data are evaluated to create th...

J. K. Tuli

1995-01-01

223

Supporting Our Nation's Nuclear Industry  

ScienceCinema

On the 60th anniversary of the world's first nuclear power plant to produce electricity, Assistant Secretary for Nuclear Energy Peter Lyons discusses the Energy Department's and the Administration's commitment to promoting a nuclear renaissance in the United States.

224

Economic Future of Nuclear Power.  

National Technical Information Service (NTIS)

Developments in the U.S. economy that will affect the nuclear power industry in coming years include the emergence of new nuclear technologies, waste disposal issues, proliferation concerns, the streamlining of nuclear regulation, a possible transition to...

D. W. Jones G. S. Tolley

2004-01-01

225

Supporting Our Nation's Nuclear Industry  

ScienceCinema

On the 60th anniversary of the world's first nuclear power plant to produce electricity, Assistant Secretary for Nuclear Energy Peter Lyons discusses the Energy Department's and the Administration's commitment to promoting a nuclear renaissance in the United States.

Lyons, Peter

2013-05-29

226

Precisión de las velocidades radiales obtenidas con el REOSC  

NASA Astrophysics Data System (ADS)

Complementando una línea de trabajo iniciada con anterioridad discutimos la estabilidad del espectrógrafo REOSC de CASLEO en DC para la medición de velocidades radiales en base al análisis de observaciones realizadas en enero y abril de 1997. En esas oportunidades obtuvimos 26 espectros de estrellas patrones y 27 espectros de 3 estrellas usadas como estrellas de referencia en nuestro programa de cúmulos abiertos. Además tomamos 26 espectros de crepúsculo con el telescopio en posiciones cubriendo el rango H=-4,+4 y ? =-90,+30. Mediante correlaciones cruzadas derivamos la velocidad de 19 órdenes en cada uno de estos espectros. En base a un análisis estadístico de los datos obtenidos discutimos la contribución de los distintos factores que afectan a la dispersión de lectura observada. En particular, la flexión del instrumento no introduciría errores significativos cuando se observa con masas de aire menores que 2.0. La dispersión de los valores de velocidad medidos para espectros de alta relación S/N de una misma estrella resultó del orden de 0.5 km/s. La comparación con los valores de velocidad publicados por distintos autores para las estrellas patrones no permite distinguir ninguna diferencia sistemática apreciable de las velocidades de CASLEO, siendo la media cuadrática de los residuos del orden de 1.0 km/s.

González, J. F.; Lapasset, E.

227

Neutrino Nuclear Responses for Neutrino Studies in Nuclear Femto Laboratories  

SciTech Connect

Fundamental properties of neutrinos and neutrino nuclear interactions are of great interest from particle and astro-nuclear physics view points. They are well studied in nuclear femto laboratories, where neutrino nuclear responses are crucial. Neutrino masses and neutrino natures are studied by neutrino-less double beta decays (0{nu}{beta}{beta}) in nuclei. Here neutrino nuclear responses are required to extract neutrino properties from 0{nu}{beta}{beta} rates. Neutrino nuclear responses are sensitive to nuclear spin isospin correlations and nuclear structures. They are experimentally studied by nuclear probes for charge exchange nuclear reactions, photon EM probes for photo-nuclear reactions, and lepton probes for muon and neutrino capture reactions.

Ejiri, Hiroyasu [Research Center for Nuclear Physics, Osaka University, Osaka 567-0047 (Japan); Nuclear Science, Czech Technical University, Brehova, Prague (Czech Republic)

2010-11-24

228

El Gobierno de las Entidades no Lucrativas. Evidencia emp¡rica para las Organizaciones no Gubernamentales de Cooperaci¢n al Desarrollo Espa¤olas  

Microsoft Academic Search

La ausencia de derechos residuales en las entidades no lucrativas (non profit) singulariza el problema de gobierno tradicionalmente estudiado. En este contexto, el objetivo de este trabajo es verificar la existencia y relevancia de los mecanismos de control para evitar la expropiaci¢n de recursos por parte de los directivos e incrementar la eficiencia en una muestra representativa de las Organizaciones

2003-01-01

229

Evaluated Nuclear Data  

SciTech Connect

This chapter describes the current status of evaluated nuclear data for nuclear technology applications. We start with evaluation procedures for neutron-induced reactions focusing on incident energies from the thermal energy up to 20 MeV, though higher energies are also mentioned. This is followed by examining the status of evaluated neutron data for actinides that play dominant role in most of the applications, followed by coolants/moderators, structural materials and fission products. We then discuss neutron covariance data that characterize uncertainties and correlations. We explain how modern nuclear evaluated data libraries are validated against an extensive set of integral benchmark experiments. Afterwards, we briefly examine other data of importance for nuclear technology, including fission yields, thermal neutron scattering and decay data. A description of three major evaluated nuclear data libraries is provided, including the latest version of the US library ENDF/B-VII.0, European JEFF-3.1 and Japanese JENDL-3.3. A brief introduction is made to current web retrieval systems that allow easy access to a vast amount of up-to-date evaluated nuclear data for nuclear technology applications.

Oblozinsky, P.; Oblozinsky,P.; Herman,M.; Mughabghab,S.F.

2010-10-01

230

Nuclear (multi-)fragmentation  

NASA Astrophysics Data System (ADS)

Nuclear (multi-)fragmentation, defined as the nuclear decay mechanism in which at least three intermediate mass fragments (Z >= 3) are produced, is the disassembly phenomenon specific to hot nuclear matter produced in nuclear collisions at beam energies of 20-100 MeV/nucleon. Considered as the manifestation of the liquid-gas phase transition predicted by nuclear matter mean-field models or an instrument to address the nuclear equation of state, it enjoys for thirty years a vivid scientific interest and motivates the construction of more and more high-performance 4?-detectors allowing for almost complete reaction characterisation on an event-by-event basis. Over the years, many experimental signatures of first- and second-order phase transitions have been proposed and identified in both central and peripheral collisions. Despite their seemingly puzzling messages, coherent understanding of multifragmentation is possible accounting for statistical ensemble inequivalence and finite size effects. Two particular situations will be discussed in detail. The first one corresponds to a multifragmenting medium size nucleus where the expected first-order phase transition is blurred by surface effects. The second one corresponds to an infinitely large system, the clusterized nuclear matter thought to constitute the main sector of baryonic matter in (proto-)neutron stars, where the first-order phase transition is quenched by Coulomb effects. In both cases statistical models with cluster degrees of freedom have been employed.

Raduta, Adriana R.

2013-04-01

231

Virtual nuclear weapons  

SciTech Connect

The term virtual nuclear weapons proliferation and arsenals, as opposed to actual weapons and arsenals, has entered in recent years the American lexicon of nuclear strategy, arms control, and nonproliferation. While the term seems to have an intuitive appeal, largely due to its cyberspace imagery, its current use is still vague and loose. The author believes, however, that if the term is clearly delineated, it might offer a promising approach to conceptualizing certain current problems of proliferation. The first use is in a reference to an old problem that has resurfaced recently: the problem of growing availability of weapon-usable nuclear materials in civilian nuclear programs along with materials made `excess` to defense needs by current arms reduction and dismantlement. It is argued that the availability of these vast materials, either by declared nuclear-weapon states or by technologically advanced nonweapon states, makes it possible for those states to rapidly assemble and deploy nuclear weapons. The second use has quite a different set of connotations. It is derived conceptually from the imagery of computer-generated reality. In this use, one thinks of virtual proliferation and arsenals not in terms of the physical hardware required to make the bomb but rather in terms of the knowledge/experience required to design, assemble, and deploy the arsenal. Virtual weapons are a physics reality and cannot be ignored in a world where knowledge, experience, materials, and other requirements to make nuclear weapons are widespread, and where dramatic army reductions and, in some cases, disarmament are realities. These concepts are useful in defining a continuum of virtual capabilities, ranging from those at the low end that derive from general technology diffusion and the existence of nuclear energy programs to those at the high end that involve conscious decisions to develop or maintain militarily significant nuclear-weapon capabilities.

Pilat, J.F.

1997-08-01

232

Mobile nuclear power systems  

NASA Astrophysics Data System (ADS)

Nuclear reactors where the energy comes from nuclear fission and isotopic generators utilizing the energy of the decay of suitable isotopes are discussed. The reactors are used as power sources on board nuclear submarines and other warships, as well as in space and in remote places. Their thermal power ranges from 30 KWth in a satellite to 175 MWth on board an aircraft carrier. Isotopic generators are suitable only for small power demands and are used on board satellites and spaceprobes, automatic weather stations, lighthouses, and marine installations for navigation and observation.

Andersson, Bengt

1988-11-01

233

Theoretical nuclear physics  

SciTech Connect

This report summarizes progress during the past year in the following areas of research: Pion double charge exchange and the role of meson exchange currents, including vector mesons, deltas, and nuclear correlations. K{sup +}-nucleus scattering and the role of meson exchange currents in supplying missing cross section.'' Pion excess distributions in nuclei, and the role of nuclear correlations. Interactions of two hyperons and the possibility of an H dibaryon. Shell model spectra and the NN tensor interaction. Statistical nuclear spectroscopy, including state densities and expectation values evaluated in terms of one-point and two-point (correlation) functions.

French, J.B.; Koltun, D.S.

1992-06-01

234

Fictions of nuclear disaster  

SciTech Connect

This work is critical study of literary interpretations of the nuclear holocaust. The author examines more than 250 stories and novels dealing with the theme of nuclear power and its devastating potential implications. Addressing such topics as the scientist and Armageddon, the role of religion, future evolution and mutation, and the postnuclear society, the author assesses the response of Bradbury, Lessing, Malamud, Shute, Huxley, Vonnegut, Heinlein, and others to the threat of nuclear apocalypse, with in-depth analyses of Alter Miller's A canticle for Leibowitz and Russell Hoban's Riddley Walker.

Dowling, D.

1987-01-01

235

Nuclear power after Chernobyl  

SciTech Connect

The causes and progress of the accident at Chernobyl are described, and a comparison between the Chernobyl accident and the 1979 accident at the Three Mile Island nuclear power station is made. Significant similarities between Chernobyl and Three Mile Island include complacency of operators and industry, deliberate negation of safety systems, and a lack of understanding of their plant on the part of the operators, which shows the critical importance of the human element. The Chernobyl accident has implications for nuclear power in the United States; it will affect the research program of the Nuclear Regulatory Commission, regulation of Department of Energy reactors, new reactor designs, and public attitudes.

Ahearne, J.F.

1987-05-08

236

Nuclear Cryogenic Propulsion Stage  

NASA Technical Reports Server (NTRS)

The fundamental capability of Nuclear Thermal Propulsion (NTP) is game changing for space exploration. A first generation Nuclear Cryogenic Propulsion Stage (NCPS) based on NTP could provide high thrust at a specific impulse above 900 s, roughly double that of state of the art chemical engines. Characteristics of fission and NTP indicate that useful first generation systems will provide a foundation for future systems with extremely high performance. The role of the NCPS in the development of advanced nuclear propulsion systems could be analogous to the role of the DC-3 in the development of advanced aviation. Progress made under the NCPS project could help enable both advanced NTP and advanced NEP.

Houts, Michael G.; Borowski, S. K.; George, J. A.; Kim, T.; Emrich, W. J.; Hickman, R. R.; Broadway, J. W.; Gerrish, H. P.; Adams, R. B.

2012-01-01

237

Nuclear Regulatory Commission issuances  

SciTech Connect

This document is the March 1996 listing of NRC issuances. Included are: (1) NRC orders granting Cleveland Electric Illuminating Company`s petition for review of the ASLB order LBP-95-17, (2) NRC orders relating to the potential disqualification of two commissioners in the matter of the decommissioning of Yankee Nuclear Power Station, (3) ASLB orders pertaining to the Oncology Services Corporation, (4) ASLB orders pertaining to the Radiation Oncology Center, (5) ASLB orders pertaining to the Yankee Nuclear Power Station, and (6) Director`s decision pertaining to the Yankee Nuclear Power Station.

NONE

1996-03-01

238

Revision curricular a partir de un analisis comparativo de las discrepancias en los curriculos de una escuela de optometria en Puerto Rico con las competencias requeridas para las agencias de revalida y acreditacion 2004  

NASA Astrophysics Data System (ADS)

El proposito de esta investigacion, un estudio cualitativo de caso, fue comparar y contrastar el curriculo vigente de la Escuela de Optometria de la UIAPR con las competencias y estandares requeridos por las agencias de acreditacion y de revalida. Con este proposito, decidimos realizar una revision y un analisis de documentos: el prontuario de cada uno de los cursos de los curriculos implantados en el 1993 y en el 2001; las competencias y estandares establecidos por las agencias de revalida y de acreditacion; y las estadisticas en las que se analiza el porcentaje de estudiantes que aprueban cada una de las partes de los examenes de revalida entre el 1998 al 2003. Se realizaron entrevistas dirigidas para dar apoyo y complementar la revision y el analisis de estos documentos. Los participantes de las entrevistas fueron tres estudiantes de la clase de optometria del 2004 (ultima clase del curriculo del 1993); tres estudiantes de la clase de optometria del 2005 (primera clase graduanda del curriculo vigente) y tres profesores y/o directores de los Departamentos de Ciencias Basicas, Ciencias Clinicas y Cuidado al Paciente. Esta investigacion se enmarco en el modelo de evaluacion curricular de discrepancia de Malcolm Provus y en el modelo de desarrollo basado en competencias. Uno de los hallazgos mas importantes del estudio es que los cambios que se implantaron al curriculo del 2001 no han logrado que los estudiantes mejoren su ejecucion en los examenes de revalida. Por otro lado, se encontro que el curriculo vigente atiende completamente los estandares de la practica de Optometria, pero no las competencias. Esta informacion fue validada mediante el uso de una tabla de cotejo para el analisis de los cursos y de la informacion obtenida de las entrevistas. El estudio determina y concluye que existen discrepancias entre los prontuarios de los cursos del curriculo y las competencias requeridas por la agencia de revalida. Segundo, que el Departamento de Ciencias Basicas es el que presenta mas deficiencias en el desarrollo de las competencias. El investigador recomienda disenar e implantar un curriculo basado en competencias y proveer formacion en didactica y procesos de aprendizaje a los profesores.

Rivera Pacheco, Andres

239

Nuclear Technology Series. Course 24: Nuclear Systems and Safety.  

ERIC Educational Resources Information Center

This technical specialty course is one of thirty-five courses designed for use by two-year postsecondary institutions in five nuclear technician curriculum areas: (1) radiation protection technician, (2) nuclear instrumentation and control technician, (3) nuclear materials processing technician, (4) nuclear quality-assurance/quality-control…

Center for Occupational Research and Development, Inc., Waco, TX.

240

Use of cermet fueled nuclear reactors for direct nuclear propulsion  

Microsoft Academic Search

There has been a renewal of interest in Direct Nuclear Propulsion (DNP) because of the Air Force Forecast II recommendation for the development of the technology. Several nuclear concepts have been proposed to meet the Direct Nuclear Propulsion challenge. In this paper we will present results of an initial study of the potential of a cermet fueled nuclear system in

S. K. Bhattacharyya; L. W. Carlson; K. D. Kuczen; N. A. Hanan; R. G. Palmer; J. Von Hoomissen; W. Chiu; R. Haaland

1988-01-01

241

Off-site environmental monitoring report: radiation monitoring around United States nuclear test areas, calendar year 1984  

Microsoft Academic Search

This report covers the routine radiation monitoring activities conducted by the Environmental Monitoring Systems Laboratory-Las Vegas in areas which may be affected by nuclear testing programs of the Department of Energy. This monitoring is conducted to document compliance with standards, to identify trends in environmental radiation, and to provide such information to the public. It summarizes these activities for calendar

G. D. Potter; S. C. Black; R. F. Grossman; R. G. Patzer; D. D. Smith

1985-01-01

242

Perceived Risk, Stigma, and Potential Economic Impacts of a High-Level Nuclear Waste Repository in Nevada.  

National Technical Information Service (NTIS)

This paper describes a program of research designed to assess the potential impacts of a high-level nuclear waste repository at Yucca Mountain, Nevada, upon tourism, retirement and job-related migration, and business development in Las Vegas and the state...

P. Slovic M. Layman N. N. Kraus J. Chalmers G. Gesel

1989-01-01

243

Going nuclear: The spread of nuclear weapons 1986-1987  

SciTech Connect

In the third annual report of the Carnegie Endowment for International Peace on the spread of nuclear weapons, Spector provides a critical survey of the status of nuclear proliferation throughout the world and examines the nuclear potential of nations in the Middle East, Asia, Africa, and Latin America. Drawing on both historical documents and up-to-date reports, the author addresses such specific topics as Israel's nuclear arsenal, nuclear terrorism and its global security implications, arms control and nuclear safeguards, international treaties, weapons buildup, and political radicalism and unrest in nuclear-threshold nations.

Spector, L.S.

1987-01-01

244

Next Generation Nuclear Plant.  

National Technical Information Service (NTIS)

The Next Generation Nuclear Plant will be a demonstration of the technical, licensing, operational, and commercial viability of high temperature gas-cooled reactor (HTGR) technology for the production of process heat, electricity, and hydrogen. This nucle...

2009-01-01

245

Nuclear Scattering Radiography  

SciTech Connect

Nuclear Scattering Radiography (N.S.R.) is based on the nuclear strong interaction of protons incident on atomic nuclei and allows a direct three dimensional reconstruction of objects. The dependence of nuclear interactions on the atomic mass is very different from the electromagnetic one which directs X-ray absorption techniques. So the delivered information is different and furthermore N.S.R. may be applied to thicker and heavier materials. Nuclear scattering of protons also allows separate scattering on hydrogen atoms from scattering on all other atoms. So one may obtain 3-D radiographs of the hydrogen content in objects. On the other hand to get the incident proton beam one needs a big particle accelerator. This limits the practical use of N.S.R. but its specific properties are so interesting that a precise study is justified.

Saudinos, J. (CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. de Physique Nucleaire)

1984-12-01

246

Nuclear Magnetic Resonance Spectroscopy  

NSDL National Science Digital Library

This website serves as a primer for understanding the fundamentals of NMR spectroscopy. Plenty of useful figures and animations that enhance the understanding of nuclear spin, shielding, and how these phenomena serve as the basis for NMR.

2011-05-18

247

Atomic Alchemy: Nuclear Processes  

NSDL National Science Digital Library

ThinkQuest is an online program that challenges students, educators at all levels to develop educational Web sites for curriculum and staff development. This specific site concentrates on Nuclear reactions and power.

2003-10-31

248

[Nuclear News -- Operations  

SciTech Connect

This section covers the interview with Peter Polfleit, corporate nuclear emergency planner for Rochester Gas and Electric Corporation, on the issues and events that affect emergency planning at Ginna.

Michal, R.A.

1999-11-01

249

[Nuclear News -- Operations  

Microsoft Academic Search

This section covers the interview with Peter Polfleit, corporate nuclear emergency planner for Rochester Gas and Electric Corporation, on the issues and events that affect emergency planning at Ginna.

Michal

1999-01-01

250

Nuclear material operations manual  

SciTech Connect

This manual provides a concise and comprehensive documentation of the operating procedures currently practiced at Sandia National Laboratories with regard to the management, control, and accountability of nuclear materials. The manual is divided into chapters which are devoted to the separate functions performed in nuclear material operations-management, control, accountability, and safeguards, and the final two chapters comprise a document which is also issued separately to provide a summary of the information and operating procedures relevant to custodians and users of radioactive and nuclear materials. The manual also contains samples of the forms utilized in carrying out nuclear material activities. To enhance the clarity of presentation, operating procedures are presented in the form of playscripts in which the responsible organizations and necessary actions are clearly delineated in a chronological fashion from the initiation of a transaction to its completion.

Tyler, R.P.

1981-02-01

251

Cancer near nuclear installations  

Microsoft Academic Search

There has been no general increase in cancer mortality near nuclear installations in England and Wales during the period 1959-1980. Leukaemia in young people may be an exception, though the reason remains unclear.

David Forman; Paula Cook-Mozaffari; Sarah Darby; Gwyneth Davey; Irene Stratton; Richard Doll; Malcolm Pike

1987-01-01

252

JPRS report, nuclear developments  

SciTech Connect

This report contains articles concerning the nuclear developments of the following countries: (1) China; (2) Japan, North Korea, South Korea; (3) Bulgaria; (4) Argentina, Brazil, Honduras; (5) India, Iran, Pakistan, Syria; (6) Soviet Union; and (7) France, Germany, Turkey.

NONE

1991-03-28

253

Superconducting Nuclear Particle Detector.  

National Technical Information Service (NTIS)

Work was undertaken to determine the feasibility of using thin superconducting films as nuclear particle detectors. The results of experiments show conclusively that such devices can be used to detect such radiation. The diffusion of energy from electrons...

D. E. Spiel R. W. Boom E. C. Crittenden

1967-01-01

254

Nuclear Engine Clustering Considerations.  

National Technical Information Service (NTIS)

Some considerations involved in the clustering of solid-core nuclear engines are examined parametrically in order to determine their importance and to indicate the effect of system tradeoffs on vehicle performance. These include neutronic coupling effects...

R. W. Langley J. S. Woyski

1965-01-01

255

Nuclear data interface retrospective  

SciTech Connect

The Nuclear Data Interface (NDI) code library and data formats are the standards for multigroup nuclear data at Los Alamos National Laboratory. NDI's analysis, design, implementation, testing, integration, and maintenance required a ten person-year and ongoing effort by the Nuclear Data Team. Their efforts provide a unique, contemporary experience in producing a standard component library. In reflection upon that experience at NDI's decennial, we have identified several factors critical to NDI's success: it addressed real problems with appropriate simplicity, it fully supported all users, it added extra value through the code to the raw nuclear data, and its team went the distance from analysis through maintenance. In this report we review these critical success factors and discuss their implications for future standardization projects.

Gray, Mark G [Los Alamos National Laboratory

2008-01-01

256

Western Nuclear Science Alliance  

SciTech Connect

The primary objective of the INIE program is to strengthen nuclear science and engineering programs at the member institutions and to address the long term goal of the University Reactor Infrastructure and Education Assistance Program.

Steve Reese; George Miller; Stephen Frantz; Denis Beller; Denis Beller; Ed Morse; Melinda Krahenbuhl; Bob Flocchini; Jim Elliston

2010-12-07

257

Desalting and Nuclear Energy  

ERIC Educational Resources Information Center

Future use of nuclear energy to produce electricity and desalted water is outlined. Possible desalting processes are analyzed to show economic feasibility and the place in planning in world's economic growth. (DS)

Burwell, Calvin C.

1971-01-01

258

International Nuclear Security  

SciTech Connect

This presentation discusses: (1) Definitions of international nuclear security; (2) What degree of security do we have now; (3) Limitations of a nuclear security strategy focused on national lock-downs of fissile materials and weapons; (4) What do current trends say about the future; and (5) How can nuclear security be strengthened? Nuclear security can be strengthened by: (1) More accurate baseline inventories; (2) Better physical protection, control and accounting; (3) Effective personnel reliability programs; (4) Minimize weapons-usable materials and consolidate to fewer locations; (5) Consider local threat environment when siting facilities; (6) Implement pledges made in the NSS process; and (7) More robust interdiction, emergency response and special operations capabilities. International cooperation is desirable, but not always possible.

Doyle, James E. [Los Alamos National Laboratory

2012-08-14

259

Society of Nuclear Medicine  

Cancer.gov

June 14, 2008 12:00 AM - June 18, 2008 12:00 AM Ernest N Morial Convention Center, Booth 419 New Orleans, LA + Add to Outlook Calendar 2008 Annual Meeting Print This Page Society of Nuclear Medicine News & Events

260

Nuclear Fuel Reprocessing  

SciTech Connect

This is an a submission for the Encyclopedia of Sustainable Technology on the subject of Reprocessing Spent Nuclear Fuel. No formal abstract was required for the article. The full article will be attached.

Michael F. Simpson; Jack D. Law

2010-02-01

261

After nuclear war - a nuclear winter  

SciTech Connect

The environmental and biological consequences of nuclear war were discussed by more than 100 eminent biologists, physicists and atmospheric scientists at the recent World after Nuclear War conference. The long-term effects were determined to be worse than the well-known immediate effects. They predicted that 225 million tons of smoke would be generated within a few days in their baseline scenario. As a result, the amount of sunlight reaching the earth would be reduced to a few percent of normal and temperatures would fall to -23/sup 0/C. About 30% of the northern middle latitudes would receive more than 250 rads radiation dose for several months and about 50% of the land area would receive more than 100 rads. Dangerous levels of solar ultraviolet light would burn through the atmosphere. It was also determined that these effects would be felt in the southern hemisphere. Those who survived the blast, fire and prompt radiation would face starvation from shutdown of plant photosynthesis and inhibition of phytoplankton photosynthesis. Huge wildfires and acid rains would stress any surviving plants and animals. Conference participants agreed that scientists had taken a new and significant step toward understanding the full consequences of nuclear war.

Tangley, L.

1984-01-01

262

Sloan Digital Sky Survey Infrastructure Preparations at Las Campanas Observatory  

NASA Astrophysics Data System (ADS)

The Sloan Digital Sky Survey, conducted on the Sloan Foundation Telescope at Apache Point Observatory for the last 15 years, is embarking on a dual hemisphere survey. This next iteration of the survey, termed SDSS-IV, will conduct a portion of the galactic evolution experiment APOGEE in Chile on the du Pont Telescope at the Las Campanas Observatory; critical portions of the Galaxy are best or only accessible in southern skies. The infrastructure for the southern survey will be derived from the mature and productive systems at APO, while the concept of operations will significantly depart from the established SDSS model. Presented herein are the elements that comprise the LCO infrastructure and the rationale for the envisioned survey operations.

Hearty, Frederick R.; Wilson, J. C.; Majewski, S. R.; Leger, F.; Harding, P.; Parejko, J. K.; Roman, A.; Ebelke, G.; SDSS-IV; APOGEE-1/2

2014-01-01

263

Proteus aircraft low-level flyby at Las Cruces Airport.  

NASA Technical Reports Server (NTRS)

The unique Proteus aircraft served as a test bed for NASA-sponsored flight tests designed to validate collision-avoidance technologies proposed for uninhabited aircraft. The tests, flown over southern New Mexico in March, 2002, used the Proteus as a surrogate uninhabited aerial vehicle (UAV) while three other aircraft flew toward the Proteus from various angles on simulated collision courses. Radio-based 'detect, see and avoid' equipment on the Proteus successfully detected the other aircraft and relayed that information to a remote pilot on the ground at Las Cruces Airport. The pilot then transmitted commands to the Proteus to maneuver it away from the potential collisions. The flight demonstration, sponsored by NASA Dryden Flight Research Center, New Mexico State University, Scaled Composites, the U.S. Navy and Modern Technology Solutions, Inc., were intended to demonstrate that UAVs can be flown safely and compatibly in the same skies as piloted aircraft.

2002-01-01

264

Principles of nuclear geology  

SciTech Connect

This book treats the basic principles of nuclear physics and the mineralogy, geochemistry, distribution and ore deposits of uranium and thorium. The application of nuclear methodology in radiogenic heat and thermal regime of the earth, radiometric prospecting, isotopic age dating, stable isotopes and cosmic-ray produced isotopes is covered. Geological processes, such as metamorphic chronology, petrogenesis, groundwater movement, and sedimentation rate are focussed on.

Aswathanarayana, U.

1985-01-01

265

Internet - a nuclear update  

SciTech Connect

Although the connection rate is slow, new nuclear utility Internet connections are being made. However, the rate of information exchange has not grown. To expedite connections, individuals are obtaining their own Internet accounts to support job-related and personal needs. The nuclear industry should increase its use of Internet to share information and access information from on-line servers. A coordinated industry effort should be made to expedite additional utility connections and provide a server system for information exchange.

Slone, B.J. III; Richardson, C.E.; Buck, B.L.

1994-12-31

266

Supersymmetry in nuclear physics  

NASA Astrophysics Data System (ADS)

I discuss several new developments in nuclear supersymmetry, in particular the identification of a new supersymmetric quartet of nuclei in the A ~ 190 region of the nuclear mass table consisting of the 192,193Os and 193,194Ir nuclei, and a study of correlations between different transfer reactions by means of generalized F-spin and SU(3) isoscalar factors. The relevant SU(3) isoscalar factors are derived in explicit form.

Bijker, Roelof

2010-06-01

267

Nuclear propulsion systems  

Microsoft Academic Search

The main results of the work done at the Research and Design Institute of Electrical Technology on the development of designs\\u000a and the creation of nuclear steam-producing systems (SPS) for propulsion are presented: the SPS VM-A for the first Soviet\\u000a nuclear powered submarine, the SPS V-5 for the most powerful and fastest submarine with design 661 in the world team,

A. N. Achkasov; G. I. Grechko; V. A. Shishkin

2007-01-01

268

Nuclear safety after Chernobyl  

SciTech Connect

This paper discussed the safety of nuclear reactors. The authors examined some of the safety problems associated with the accidents at Chernobyl and Three Mile Island. He stressed the need to reduce the frequency of accidents and the need for greater preparation for the consequences of inevitable failures. He stated that future accidents would be unlikely to replicate the past, that nuclear safety issues need to be addressed broadly and that reforms need to be introduced quickly.

Flavin, C.

1987-07-01

269

Russian nuclear forces, 2012  

Microsoft Academic Search

Despite the promise of a more transparent future after Russia's ratification of New START in January 2011, the international community’s ability to monitor developments in Russia’s nuclear forces has become more difficult because the Kremlin does not release full aggregate treaty numbers of the country’s strategic nuclear forces and the United States has agreed not to make the information available

Hans M. Kristensen; Robert S. Norris

2012-01-01

270

Nuclear and radiochemical analysis  

SciTech Connect

In this, their second fundamental review under the present authorship and title, they have chosen to continue their emphasis on topics representing the use of nuclear properties for chemical analysis. Excluded are topics in the areas of health physics, nuclear spectroscopy (unless directly related to analysis), nuclear engineering, fusion, radioactive waste disposal, fallout, and nuclear and particle physics. Other topics such as particle-induced X-ray emission (PIXE), plasma desorption mass spectrometry, radioimmunoassay, Moessbauer spectroscopy, nuclear dating methods, and radiotracer applications are treated briefly here, since they are adequately covered in other current reviews in this or other major journals. Only a brief mention is made of well logging, since many of the advances in this field do not currently appear in the open literature. As in their previous review, they finish with short comments on some interesting developments in nuclear and radiochemistry that are not strictly analytical in nature. This review is based largely on a computerized keyword search of Chemical Abstracts (CA) for the period from mid-November 1985 through December 31, 1987.

Ehmann, W.D.; Yates, S.W.

1988-06-15

271

Superpower nuclear minimalism  

SciTech Connect

During the Cold War, the United States and the Soviet Union competed in building weapons -- now it seems like America and Russia are competing to get rid of them the fastest. The lengthy process of formal arms control has been replaced by exchanges of unilateral force reductions and proposals for reciprocal reductions not necessarily codified by treaty. Should superpower nuclear strategies change along with force postures President Bush has yet to make a formal pronouncement on post-Cold War American nuclear strategy, and it is uncertain if the Soviet/Russian doctrine of reasonable sufficiency formulated in the Gorbachev era actually heralds a change in strategy. Some of the provisions in the most recent round of unilateral proposals put forth by Presidents Bush and Yeltsin in January 1992 are compatible with a change in strategy. Whether such a change has actually occurred remains to be seen. With the end of the Cold War and the breakup of the Soviet Union, the strategic environment has fundamentally changed, so it would seem logical to reexamine strategy as well. There are two main schools of nuclear strategic thought: a maximalist school, mutual assured destruction (MAD) which emphasizes counterforce superiority and nuclear war- fighting capability, and a MAD-plus school, which emphasizes survivability of an assured destruction capability along with the ability to deliver small, limited nuclear attacks in the event that conflict occurs. The MAD-plus strategy is based on an attempt to conventionalize nuclear weapons which is unrealistic.

Graben, E.K.

1992-01-01

272

JTEC Panel on Nuclear Power in Japan.  

National Technical Information Service (NTIS)

The report examines the status and direction of nuclear power-related research and development in Japan in six areas: the nuclear fuel cycle, nuclear materials, instrumentation and control technology, CAD/CAM, nuclear safety research, and nuclear plant co...

K. F. Hansen W. B. Behnke S. B. Cousin E. A. Evans D. R. Olander

1990-01-01

273

The future of nuclear power  

Microsoft Academic Search

Present conditions and future prospects for the nuclear power industry in the United States are discussed. The presentation includes a review of trends in electrical production, the safety of coal as compared to nuclear generating plants, the dangers of radiation, the economics of nuclear power, the high cost of nuclear power in the United States, and the public fear of

Zeile

1987-01-01

274

Nuclear fuel and energy policy  

Microsoft Academic Search

This book examines the uranium resource situation in relation to the future needs of the nuclear economy. Currently the United States is the world's leading producer and consumer of nuclear fuels. In the future US nuclear choices will be highly interdependent with the rest of the world as other countries begin to develop their own nuclear programs. Therefore the world's

Ahmed

1979-01-01

275

Nuclear War and Science Teaching.  

ERIC Educational Resources Information Center

Suggests that science-related material on nuclear war be included in introductory courses. Lists nuclear war topics for physics, psychology, sociology, biology/ecology, chemistry, geography, geology/meteorology, mathematics, and medical science. Also lists 11 lectures on nuclear physics which include nuclear war topics. (JN)

Hobson, Art

1983-01-01

276

Thinking About Preventing Nuclear War.  

ERIC Educational Resources Information Center

Potential paths to nuclear war and the available means of prevention of nuclear war are discussed. Presented is a detailed description of six nuclear war scenarios, and brief examples of types of potential deterrents to nuclear war (firebreaks) which are relevant for each. To be effective, the right combination of firebreaks must be used, the…

Ground Zero, Washington, DC.

277

The North Korean nuclear dilemma  

Microsoft Academic Search

The current nuclear crisis, the second one in ten years, erupted when North Korea expelled international nuclear inspectors in December 2002, then withdrew from the Nuclear Nonproliferation Treaty (NPT), and claimed to be building more nuclear weapons with the plutonium extracted from the spent fuel rods heretofore stored under international inspection. These actions were triggered by a disagreement over U.S.

Hecker; Siegfried S

2004-01-01

278

Nuclear reactor safety heat transfer  

Microsoft Academic Search

Nuclear Reactor Safety Heat Transfer is presented in five major sections.The first section presents the background material placing nuclear power in perspective. Starting with a historical overview, followed by fundamental concepts of nuclear energy and the philosphy of risk, the first three chapters: give the reader a brief but thorough introduction to nuclear power generation; describe the different types of

O. C. Jr

1981-01-01

279

Nuclear power plant life extension  

Microsoft Academic Search

Nuclear plant life extension represents an opportunity to achieve additional productive years of operation from existing nuclear power facilities. This is particularly important since operating licenses for over 50 GW of nuclear capacity will expire by the year 2010. By the year 2015, 85% of the total planned nuclear electric capacity will face retirement due to license expirations. Achieving additional

D. D. Carlson; L. D. Bustard; D. L. Harrison

1986-01-01

280

Nuclear powerplants for mobile applications.  

NASA Technical Reports Server (NTRS)

Mobile nuclear powerplants for applications other than large ships and submarines will require compact, lightweight reactors with especially stringent impact-safety design. This paper examines the technical and economic feasibility that the broadening role of civilian nuclear power, in general, (land-based nuclear electric generating plants and nuclear ships) can extend to lightweight, safe mobile nuclear powerplants. The paper discusses technical experience, identifies potential sources of technology for advanced concepts, cites the results of economic studies of mobile nuclear powerplants, and surveys future technical capabilities needed by examining the current use and projected needs for vehicles, machines, and habitats that could effectively use mobile nuclear reactor powerplants.

Anderson, J. L.

1972-01-01

281

Modern developments in nuclear physics  

SciTech Connect

These proceedings discuss the following topics: Experiments with an internal target in electron storage ring; electromagnetic coincidence experiments; tunneling in many-fermion systems; fragment flow in medium effects and the nuclear equation of state; quark-gluon plasma - theory and experiments; nucleus-nucleus collisions; new data on cumulative particles, quasielectric proton scattering; interacting boson method and quasiparticles - phonon nuclear model; nuclear structure and lepton scattering and prospects of nuclear physics with electromagnetic probes; and unified theory of nuclear structure and fission.

Sushkov, O.P

1988-01-01

282

Gobierno y eficiencia de las cajas de ahorro espa¤olas  

Microsoft Academic Search

El presente trabajo analiza la relaci¢n existente entre la composici¢n y estructura de los ¢rganos de gobierno de las cajas de ahorros espa¤olas y su eficiencia en el a¤o 1999. Utilizando ecuaciones tobit los resultados del estudio constatan la existencia de una relaci¢n negativa entre la participaci¢n de las administraciones p£blicas en el consejo de administraci¢n de las cajas y

2002-01-01

283

City of Las Vegas Plug-in Hybrid Electric Vehicle Demonstration Program  

SciTech Connect

The City of Las Vegas was awarded Department of Energy (DOE) project funding in 2009, for the City of Las Vegas Plug-in Hybrid Electric Vehicle Demonstration Program. This project allowed the City of Las Vegas to purchase electric and plug-in hybrid electric vehicles and associated electric vehicle charging infrastructure. The City anticipated the electric vehicles having lower overall operating costs and emissions similar to traditional and hybrid vehicles.

None

2013-12-31

284

Nuclear tests mean new weapons  

SciTech Connect

Stockpile maintenance does not require nuclear testing. With the consensus that there is not technical substitute for developmental nuclear weapons testing, there appears to be an unambiguous opportunity for a secure and meaningful comprehensive test ban. From a national security standpoint, nuclear innovations and nuclear tests are entirely dispensable. The prospects of nuclear retaliation are severe enough that no country could assume the ability to conduct a nuclear strike with impunity. The precise combination of yield, accuracy, and radiation effects from a nuclear weapon is insignificant, compared to the overall consequences of a nuclear attack. Deterrence, independent as it is of the details of nuclear warhead design, will persist whether or not nuclear tests are conducted. An abrupt adoption of a comprehensive test ban would interrupt the US nuclear weapons development program without harming the nation's ability to maintain a safe and reliable deterrent. But the nuclear weapons design laboratories have a long history of influential opposition to a test ban. In part, this is because the large-scale nuclear weapons research and development program gives the weapons laboratories not only a license but a mandate to continue introducing new weapons into the stockpile. A comprehensive test ban, accompanied by restructuring of the nuclear weapons program as a maintenance operation, would safeguard the nuclear deterrent while bringing the qualitative arms race to a halt. 5 references, 3 figures.

Stein, J.A.

1986-11-01

285

La Transpiración - Movimiento del Agua a Través de las Plantas  

NSDL National Science Digital Library

La transpiración es la pérdida de agua en forma de vapor por las plantas. El agua es absorbida del suelo por las raíces y transportada en forma líquida por el xilema hacia las hojas. En las hojas, unos pequeños poros permiten que el agua (H2O) escape a la atmósfera en forma de vapor, al tiempo que se permite la entrada de bióxido de carbono (CO2) para la fotosíntesis. De toda el agua absorbida por las plantas, menos del 5% es retenida y utilizada para crecimiento y almacenamiento. En esta lección se explicará porque las plantas pierden tanta agua, la ruta que ésta sigue dentro de la planta, como pudieran las plantas controlar la pérdida excesiva de agua y como las condiciones ambientales influyen en la pérdida de agua por las plantas.

286

QsIA disrupts LasR dimerization in antiactivation of bacterial quorum sensing  

PubMed Central

The human pathogen Pseudomonas aeruginosa coordinates the expression of virulence factors by using quorum sensing (QS), a signaling cascade triggered by the QS signal molecule and its receptor, a member of the LuxR family of QS transcriptional factors (LasR). The QS threshold and response in P. aeruginosa is defined by a QS LasR-specific antiactivator (QslA), which binds to LasR and prevents it from binding to its target promoter. However, how QslA binds to LasR and regulates its DNA binding activity in QS remains elusive. Here we report the crystal structure of QslA in complex with the N-terminal ligand binding domain of LasR. QsIA exists as a functional dimer to interact with the LasR ligand binding domain. Further analysis shows that QsIA binding occupies the LasR dimerization interface and consequently disrupts LasR dimerization, thereby preventing LasR from binding to its target DNA and disturbing normal QS. Our findings provide a structural model for understanding the QslA-mediated antiactivation mechanism in QS through protein–protein interaction.

Fan, Hui; Dong, Yihu; Wu, Donghui; Bowler, Matthew W.; Zhang, Lianhui; Song, Haiwei

2013-01-01

287

Seismic Wave Amplification in Las Vegas: Site Characterization Measurements and Response Models  

NASA Astrophysics Data System (ADS)

As part of a multidisciplinary effort to understand seismic wave amplification in Las Vegas Valley, we conducted geotechnical and seismic refraction field studies, geologic and lithologic interpretation, and geophysical model building. Frequency-dependent amplifications (site response) and peak ground motions strongly correlate with site conditions as characterized by the models. The models include basin depths and velocities, which also correlate against ground motions. Preliminary geologic models were constructed from detailed geologic and fault mapping, logs of over 500 wells penetrating greater than 200 m depth, gravity-inversion results from the USGS, and USDA soil maps. Valley-wide refraction studies we conducted in 2002 and 2003 were inverted for constraints on basin geometry, and deep basin and basement P velocities with some 3-d control to depths of 5 km. Surface-wave studies during 2002-2004 characterized more than 75 sites within the Valley for shear velocity to depths exceeding 100 m, including all the legacy sites where nuclear-blast ground motions were recorded. The SASW and refraction-microtremor surface-surveying techniques proved to provide complementary, and coordinating Rayleigh dispersion-curve data at a dozen sites. Borehole geotechnical studies at a half-dozen sites confirmed the shear-velocity profiles that we derived from surface-wave studies. We then correlated all the geotechnical data against a detailed stratigraphic model, derived from drilling logs, to create a Valley-wide model for shallow site conditions. This well-log-based model predicts site measurements better than do models based solely on geologic or soil mapping.

Louie, J. N.; Anderson, J. G.; Luke, B.; Snelson, C.; Taylor, W.; Rodgers, A.; McCallen, D.; Tkalcic, H.; Wagoner, J.

2004-12-01

288

Comet Nuclear Magnitudes  

NASA Astrophysics Data System (ADS)

The size distribution of comets, although crucial for assessing theories of their origin, remains largely uncertain. Measurements of cometary nuclear magnitudes have been made for a few comets when their activity level was low. Estimates for their corresponding nuclear diameters can then be made if their albedos are known. While albedos have been determined for only about 5 short period comets, those albedos have been consistently very low averaging about 3--4%. Attempts to directly measure nuclear magnitudes have been made for only a small handful of objects. An alternate method which uses total magnitude measurements of comets, assumming that the measured total magnitudes approach their nuclear magnitudes when the object is far from the Sun has yielded measurements for about 60 short period comets. The 0.91-m Spacewatch Telescope on Kitt Peak has been used since 1985 to make astrometric observations of a large number of comets. A Tektronix 2048times 2048 pixel CCD is used unfiltered at the f/5 Newtonian focus. The data include a large and relatively consistent set of measurements of faint, nearly quiescent comets. We have extracted nuclear magnitudes from these data by estimating and removing the contribution of any coma which may be present. Given the geometry at the moment of observation, the nuclear absolute magnitudes can then be calculated, and then, given an assummed albedo of 3%, the nuclear sizes can be estimated. We find that the sizes of most short period comet nuclei are in the 2-10 kilometer range. While a trend of larger comets at larger perihelion distance is noted, this trend is most likely due to detection biases in the discovery of the comets. We find no short period comets with nuclear magnitudes fainter than 18.0 (diameter 2 kilometers assumming an albedo of 3%) in our sample of 56 well observed short period comets. This may also be due to detection biases in the discoveries of comets, or it may be due to intrinsic properties of smaller short period comet nuclei. Detailed analysis of the nuclear magnitude measurements for P/Encke has resulted in a determination of the phase coefficient for that comet of 0.08 magnitudes/degree.

Scotti, James V.

1994-12-01

289

Nuclear data for astrophysics  

NASA Astrophysics Data System (ADS)

In order to address important astrophysics problems such as the origin of the chemical elements, the inner workings of our Sun, and the evolution of stars, crucial nuclear datasets are needed. Recent evaluation and dissemination efforts have produced a number of such datasets, many of which are online and readily available to the research community. Current international efforts in this field are, unfortunately, insufficient to keep pace with the latest nuclear physics measurements and model calculations. A dedicated effort is required to update and expand existing datasets. I discuss several strategies and new initiatives that would ensure a more effective utilization of nuclear data in astrophysics. These include launching a new web site www.nucastrodata.org to aid in locating available nuclear data sets, and an interactive online plotting program with an easy-to-use graphical user interface to over 8000 reaction rates. An enhanced effort in this field could be maintained by formalizing the position of a Nuclear Astrophysics Data Coordinator.

Smith, Michael S.

2003-05-01

290

Nuclear pumped laser II  

NASA Technical Reports Server (NTRS)

The first direct nuclear pumped laser using the He-2-(n,p) H-3 reaction is reported. Lasing took place on the 1.79 microns Ar I transition in a mixture of He-3-Ar at approximately 600 Torr total pressure. It was found that the electrically pulsed afterglow He-Ar laser had the same concentration profile as the nuclear pumped laser. As a result, nuclear lasing was also achieved in He-3-Xe (2.027 micron) and He-3-Kr (2.52 micron). Scaling of laser output with both thermal flux and total pressure as well as minority concentration has been completed. A peak output (He-3-Ar) of 3.7 watts has been achieved at a total pressure of 4 atm. Direct nuclear pumping of He-3-Ne has also been achieved. Nuclear pumping of a He-3-NF3 mixture was attempted, lasing in FI at approximately 7000 A, without success, although the potential lasing transitions appeared in spontaneous emission. Both NF3 and 238UF6 appear to quench spontaneous emission when they constitute more than 1% of the gas mixture.

Deyoung, R. J.; Lee, J. H.; Pinkston, W. T.

1977-01-01

291

Nuclear concepts/propulsion  

NASA Technical Reports Server (NTRS)

Nuclear thermal and nuclear electric propulsion systems will enable and/or enhance important space exploration missions to the moon and Mars. Current efforts are addressing certain research areas, although NASA and DOE still have much work yet to do. Relative to chemical systems, nuclear thermal propulsion offers the potential of reduced vehicle weight, wider launch windows. and shorter transit times, even without aerobrakes. This would improve crew safety by reducing their exposure to cosmic radiation. Advanced materials and structures will be an important resource in responding to the challenges posed by safety and test facility requirements, environmental concerns, high temperature fuels and the high radiation, hot hydrogen environment within nuclear thermal propulsion systems. Nuclear electric propulsion (NEP) has its own distinct set of advantages relative to chemical systems. These include low resupply mass, the availability of large amounts of onboard electric power for other uses besides propulsion, improved launch windows, and the ability to share technology with surface power systems. Development efforts for NEP reactors will emphasize long life operation of compact designs. This will require designs that provide high fuel burnup and high temperature operation along with personnel and environmental safety.

Miller, Thomas J.

1993-01-01

292

Nuclear age thinking  

SciTech Connect

According to the practicalist school, thinking emerges from activity and each human practice is giving food to its own distinctive kinds of perception, conduct, and perspective of the world. The author, while studying and describing developments after the commencement of the nuclear age in many fields of human behavior and knowledge, including the social sciences, particularly psychology and international politics, became an adherent to the practicalist philosophy when he perceived new relevant thoughts coming to his mind at the same time. Indeed writing is a learning experience. He has, therefore, systematically included these thoughts in the following pages and synoptically characterized them in the title: Nuclear Age Thinking. He considers this kind of thinking as automatic, conscious activity which is gradually influencing our choices and decisions. The author has reservations as regards Albert Einstein's saying that the unleashed power of the atom changed everything save our modes of thinking, because the uncontrollability of nuclear energy is apparently in the subconscious of mankind nowadays, influencing the development of a new mode of thinking, and that is the nuclear age thinking which is the subject of this book. Nuclear age thinking drives from the collective fear of extinction of life on earth due to this new power at man's disposal, and it is not only limited to the change in the conventional meaning of the words war and peace.

Depastas, A.N.

1990-01-01

293

Nuclear Neighborhoods and Gene Expression  

PubMed Central

Summary The eukaryotic nucleus is a highly compartmentalized and dynamic environment. Chromosome territories are arranged non-randomly within the nucleus and numerous studies have indicated that a gene’s position in the nucleus can impact its transcriptional activity. Here, we focus on recent advances in our understanding of the influence of specific nuclear neighborhoods on gene expression or repression. Nuclear neighborhoods associated with transcriptional repression include the inner nuclear membrane/nuclear lamina and peri-nucleolar chromatin, whereas neighborhoods surrounding the nuclear pore complex, PML nuclear bodies, and nuclear speckles seem to be transcriptionally permissive. While nuclear position appears to play an important role in gene expression, it is likely to be only one piece of a flexible puzzle that incorporates numerous parameters. We are still at a very early, yet exciting stage in our journey toward deciphering the mechanism(s) that govern the permissiveness of gene expression/repression within different nuclear neighborhoods.

Zhao, Rui; Bodnar, Megan S.; Spector, David L.

2009-01-01

294

Nuclear explosive safety study process  

SciTech Connect

Nuclear explosives by their design and intended use require collocation of high explosives and fissile material. The design agencies are responsible for designing safety into the nuclear explosive and processes involving the nuclear explosive. The methodology for ensuring safety consists of independent review processes that include the national laboratories, Operations Offices, Headquarters, and responsible Area Offices and operating contractors with expertise in nuclear explosive safety. A NES Study is an evaluation of the adequacy of positive measures to minimize the possibility of an inadvertent or deliberate unauthorized nuclear detonation, high explosive detonation or deflagration, fire, or fissile material dispersal from the pit. The Nuclear Explosive Safety Study Group (NESSG) evaluates nuclear explosive operations against the Nuclear Explosive Safety Standards specified in DOE O 452.2 using systematic evaluation techniques. These Safety Standards must be satisfied for nuclear explosive operations.

NONE

1997-01-01

295

Pediatric nuclear medicine  

SciTech Connect

This symposium presented the latest techniques and approaches to the proper medical application of radionuclides in pediatrics. An expert faculty, comprised of specialists in the field of pediatric nuclear medicine, discussed the major indications as well as the advantages and potential hazards of nuclear medicine procedures compared to other diagnostic modalities. In recent years, newer radiopharmaceuticals labeled with technetium-99m and other short-lived radionuclides with relatively favorable radiation characteristics have permitted a variety of diagnostic studies that are very useful clinically and carry a substantially lower radiation burden then many comparable X-ray studies. This new battery of nuclear medicine procedures is now widely available for diagnosis and management of pediatric patients. Many recent research studies in children have yielded data concerning the effacacy of these procedures, and current recommendations will be presented by those involved in conducting such studies. Individual papers are processed separately for the Energy Data Base.

Not Available

1986-01-01

296

Optimization of linear alkylbenzene sulfonate (LAS) degradation in UASB reactors by varying bioavailability of LAS, hydraulic retention time and specific organic load rate.  

PubMed

Degradation of linear alkylbenzene sulfonate (LAS) in UASB reactors was optimized by varying the bioavailability of LAS based on the concentration of biomass in the system (1.3-16 g TS/L), the hydraulic retention time (HRT), which was operated at 6, 35 or 80 h, and the concentration of co-substrates as specific organic loading rates (SOLR) ranging from 0.03-0.18 g COD/g TVS.d. The highest degradation rate of LAS (76%) was related to the lowest SOLR (0.03 g COD/g TVS.d). Variation of the HRT between 6 and 80 h resulted in degradation rates of LAS ranging from 18% to 55%. Variation in the bioavailability of LAS resulted in discrete changes in the degradation rates (ranging from 37-53%). According to the DGGE profiles, the archaeal communities exhibited greater changes than the bacterial communities, especially in biomass samples that were obtained from the phase separator. The parameters that exhibited more influence on LAS degradation were the SOLR followed by the HRT. PMID:23196232

Okada, Dagoberto Y; Delforno, Tiago P; Esteves, Andressa S; Sakamoto, Isabel K; Duarte, Iolanda C S; Varesche, Maria B A

2013-01-01

297

Shoreham Nuclear Power Plant  

SciTech Connect

The United States Supreme Court, with PG&E and Silkwood, and in the eight years since, has expanded the acceptable extent of state regulation of commercial nuclear power plants. In PG&E, the Court established the acceptability of state regulation that purports to be concerned with the non-radiological aspects of nuclear plant operations but that, as a practical matter, is concerned with their radiological hazards. In Silkwood, the Court established the acceptability of state regulation of radiological hazards when its impact on federal regulation of radiological hazards is indirect and incidental. Finally, in Goodyear and English, the Court confirmed and elaborated on such state regulation. Subject to political demands either for additional involvement in commercial nuclear power plant regulation or from political interests opposed altogether to nuclear power, some states, in the 1980s, sought to expand even further the involvement of state and local governments in nuclear plant regulation. Indeed, some states sought and in some instances acquired, through innovative and extraordinary means, a degree of involvement in the regulation of radiological hazards that seriously erodes and undermines the role of the federal government in such regulation. In particular, the State of New York concluded with the Long Island Lighting Company (LILCO), in February 1989, an agreement for the purchase of New York of the Shoreham nuclear power plant on Long Island. A response to failed efforts by New York to prevent the issuance by the NRC of a license to LILCO to operate the plant, the agreement was concluded to allow New York to close the plant either altogether or to convert it to a fossil fuel facility. The opposition to the sale of Shoreham is discussed.

NONE

1992-12-31

298

Evidence for Filamentarity in the Las Campanas Redshift Survey  

NASA Astrophysics Data System (ADS)

We apply Shapefinders, statistical measures of ``shape'' constructed from two-dimensional partial Minkowski functionals, to study the degree of filamentarity in the Las Campanas Redshift Survey (LCRS). In two dimensions, three Minkowski functionals characterize the morphology of an object; these are its perimeter (L), area (S), and genus. Out of L and S a single dimensionless Shapefinder statistic, \\Fscr, can be constructed (0<=\\Fscr<=1). The statistic \\Fscr acquires extreme values on a circle (\\Fscr=0) and a filament (\\Fscr=1). Using \\Fscr, we quantify the extent of filamentarity in the LCRS by comparing our results with a Poisson distribution having similar geometrical properties and the same selection function as the survey. Our results unambiguously demonstrate that the LCRS displays a high degree of filamentarity in both the northern and southern Galactic sections, in general agreement with the visual appearance of the catalog. It is well known that gravitational clustering from Gaussian initial conditions gives rise to the development of non-Gaussianity, reflected in the formation of a network-like filamentary structure on supercluster scales. Consequently, the fact that the smoothed LCRS catalog shows properties consistent with those of a Gaussian random field,whereas the unsmoothed catalog demonstrates the presence of filamentarity, lends strong support to the conjecture that the large-scale clustering of galaxies is driven by gravitational instability.

Bharadwaj, Somnath; Sahni, Varun; Sathyaprakash, B. S.; Shandarin, Sergei F.; Yess, Capp

2000-01-01

299

The T dwarf population in the UKIDSS LAS .  

NASA Astrophysics Data System (ADS)

We present the most recent results from the UKIDSS Large Area Survey (LAS) census and follow up of new T brown dwarfs in the local field. The new brown dwarf candidates are identified using optical and infrared survey photometry (UKIDSS and SDSS) and followed up with narrow band methane photometry (TNG) and spectroscopy (Gemini and Subaru) to confirm their brown dwarf nature. Employing this procedure we have discovered several dozens of new T brown dwarfs in the field. Using methane differential photometry as a proxy for spectral type for T brown dwarfs has proved to be a very efficient technique. This method can be useful in the future to reliably identify brown dwarfs in deep surveys that produce large samples of faint targets where spectroscopy is not feasible for all candidates. With this statistical robust sample of the mid and late T brown dwarf field population we were also able to address the discrepancies between the observed field space density and the expected values given the most accepted forms of the IMF of young clusters.

Cardoso, C. V.; Burningham, B.; Smith, L.; Smart, R.; Pinfield, D.; Magazzù, A.; Ghinassi, F.; Lattanzi, M.

300

Nuclear-bound quarkonium  

SciTech Connect

We show that the QCD van der Waals interaction due to multiple gluon exchange provides a new kind of attractive nuclear force capable of binding heavy quarkonia to nuclei. The parameters of the potential are estimated by identifying multigluon exchange with the Pomeron contributions to elastic meson-nucleon scattering. The gluonic potential is then used to study the properties of {ital c{bar c}} nuclear-bound states. In particular, we predict bound states of the {eta}{sub {ital c}} with {sup 3}He and heavier nuclei. Production modes and rates are also discussed.

Brodsky, S.J.; Schmidt, I. (Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (USA)); de Teramond, G.F. (Escuela de Fisica, Universidad de Costa Rica, San Jose, Costa Rica (CR))

1990-02-26

301

Focused technology: Nuclear propulsion  

NASA Technical Reports Server (NTRS)

The topics presented are covered in viewgraph form and include: nuclear thermal propulsion (NTP), which challenges (1) high temperature fuel and materials, (2) hot hydrogen environment, (3) test facilities, (4) safety, (5) environmental impact compliance, and (6) concept development, and nuclear electric propulsion (NEP), which challenges (1) long operational lifetime, (2) high temperature reactors, turbines, and radiators, (3) high fuel burn-up reactor fuels, and designs, (4) efficient, high temperature power conditioning, (5) high efficiency, and long life thrusters, (6) safety, (7) environmental impact compliance, and (8) concept development.

Miller, Thomas J.

1991-01-01

302

Costs of nuclear medicine.  

PubMed

The cost of nuclear medicine procedures in a small department run as part of a general imaging service in the financial year 1984/5, using standard commercial nomenclature and concepts (variable, semi-variable and fixed costs), are reported. The necessity for a standard costing system and the use of overhead absorption rates for all three types of cost are emphasized, and the value is shown of doing enough work to make economic use of the equipment and staff time. Nuclear medicine procedures appear to be comparable in cost to imaging procedures involving fluoroscopy. PMID:3386968

Bretland, P M

1988-01-01

303

STRUCTURAL BIOLOGY: Nuclear Trafficking  

NSDL National Science Digital Library

Access to the article is free, however registration and sign-in are required. The transcription factor SREBP-2 is a crucial component in cholesterol metabolism, switching on genes that regulate the synthesis and uptake of cholesterol. To activate these genes, SREBP-2 must be transported from the cytoplasm into the nucleus. In his Perspective, Stewart discusses an analysis of the crystal structure of SREBP-2 bound to its nuclear transport protein, importin-beta, which sheds new light on SREBP-2 nuclear transport (Lee et al.).

Murray Stewart (MRC Laboratory of Molecular Biology;)

2003-11-28

304

Europe's nuclear power experiment  

SciTech Connect

The OECD (Dragon) Project was a joint venture of 12 European countries set up to study the development of high temperature reactor technology and whose programme included the construction of a demonstration high temperature helium cooled reactor and its eventual operation. The Project, which spanned 17 years, was widely regarded as an extremely successful excercise in international collaboration in nuclear technology. This specially commissioned work describes the international background to the launching of the Project, providing an unbiased appraisal of the industrial, technical, administrative and political aspects of the Project's development and the problems encountered, and an evaluation of the Project's significance in the general, context of nuclear power development.

Shaw, E.N.

1983-01-01

305

Friction in nuclear dynamics  

SciTech Connect

The problem of dissipation in nuclear dynamics is related to the breaking down of nuclear symmetries and the transition from ordered to chaotic nucleonic motions. In the two extreme idealizations of the perfectly Ordered Regime and the fully Chaotic Regime, the nucleus should behave as an elastic solid or an overdamped fluid, respectively. In the intermediate regime a complicated visco-elastic behaviour is expected. The discussion is illustrated by a simple estimate of the frequency of the giant quadrupole resonance in the Ordered Regime and by applications of the wall and window dissipation formulae in the Chaotic Regime. 51 refs.

Swiatecki, W.J.

1985-03-01

306

Nuclear War Survival Skills  

SciTech Connect

The purpose of this book is to provide Americans with information and instructions that will significantly increase their chances of surviving a possible nuclear attack. It brings together field-tested instructions that, if followed by a large fraction of Americans during a crisis that preceded an attack, could save millions of lives. The author is convinced that the vulnerability of our country to nuclear threat or attack must be reduced and that the wide dissemination of the information contained in this book would help achieve that objective of our overall defense strategy.

Kearny, C.H.

2002-06-24

307

Nuclear medicine imaging system  

DOEpatents

It is an object of this invention to provide a nuclear imaging system having the versatility to do positron annihilation studies, rotating single or opposed camera gamma emission studies, and orthogonal gamma emission studies. It is a further object of this invention to provide an imaging system having the capability for orthogonal dual multipinhole tomography. It is another object of this invention to provide a nuclear imaging system in which all available energy data, as well as patient physiological data, are acquired simultaneously in list mode.

Bennett, G.W.; Brill, A.B.; Bizais, Y.J.C.; Rowe, R.W.; Zubal, I.G.

1983-03-11

308

Nuclear waste's last stand  

SciTech Connect

It's hard to imagine a more unwelcome neighbor than nuclear waste. But something has to be done with the spent fuel now piling up at nuclear plants in the United States. While a handful of Indian tribes and other communities have shown interest in hosting a temporary storage site, the outcry from their neighbors and politicians may squash their plans. Now, a decade after the federal government began the search for a permanent repository, it still can't find even a temporary destination. Here's look at the problem and its consequences.

Not Available

1992-12-01

309

Surgimiento de irreversibilidad dinámica en sistemas cuánticos de muchos cuerpos: Una prueba usando resonancia magnética nuclear  

Microsoft Academic Search

La técnica de resonancia magnética nuclear permite crear una polarización local de no-equilibrio y posteriormente detectar su evolución. También es posible invenir el signo del hamihoniano dipolar efectivo y así revertir una dinámica aparentememe difusiva. generando un eco de polarización. Las mediciones en policrislales de (C~Hs)Mn(COh y de (CsHshFe mostraron ecos que se atenúan como función del tiempo tR transcurrido

Horacio M. Paslawski; Gonzalo Usaj; Rodrigo A. Iglesias

310

Nuclear Energy: Challenges and Directions  

NASA Astrophysics Data System (ADS)

There are many myths regarding nuclear energy. Nuclear energy provides many advantages but like all other power generation methods it has some drawbacks. There have been some serious accidents involving nuclear power generation with the most recent occurring at Fukushima Daiichi. What role will nuclear energy play in the future? What are the challenges of the nuclear landscape as we move forward? Are there changes in policy or technology that should be considered? A vision of nuclear energy will be provided in an attempt to address these upcoming opportunities and challenges.

Pierson, Mark

2011-10-01

311

High-Level Nuclear Waste Transport and Storage Assessment of Potential Impacts on Tourism in the Las Vegas Area. Nevada Nuclear Waste Storage Investigations Project.  

National Technical Information Service (NTIS)

The literature review and empirical analyses presented in this report were undertaken, for the most part, between August and October 1983. They are not comprehensive. No primary data were gathered, nor were any formal surveys conducted. Additionally, beca...

1985-01-01

312

Effects of Nuclear Electromagnetic Pulse (EMP) on Nuclear Power Plants.  

National Technical Information Service (NTIS)

The electromagnetic pulse (EMP) from a high-altitude nuclear detonation consists of a transient pulse of high intensity electromagnetic fields. These intense fields induce current and voltage transients in electrical conductors. Although most nuclear powe...

P. R. Barnes R. R. Davis R. W. Manweiler

1977-01-01

313

From the secrets of nuclear shapes into quantum nuclear phyics  

SciTech Connect

After a few 'historical remarks' related to the evolution of our knowledge on nuclear shape effects, recent events in super-deformation studies are commented from the point of view of their general importance for nuclear physics. 12 refs.

Dudek, J.

1988-01-01

314

76 FR 3837 - Nuclear Decommissioning Funds; Correction  

Federal Register 2010, 2011, 2012, 2013

...RIN 1545-BF08 Nuclear Decommissioning Funds; Correction AGENCY...to trusts maintained for decommissioning nuclear power plants. DATES: This correction...interest in a nuclear power plant. * * * * *...

2011-01-21

315

Nuclear chromodynamics: Novel nuclear phenomena predicted by QCD  

NASA Astrophysics Data System (ADS)

With the acceptance of QCD as the fundamental theory of strong interactions, one of the basic problems in the analysis of nuclear phenomena became how to consistently account for the effects of the underlying quark/gluon structure of nucleons and nuclei. Besides providing more detailed understanding of conventional nuclear physics, QCD may also point to novel phenomena accessible by new or upgraded nuclear experimental facilities. We review several interesting applications of QCD to nuclear physics.

Bakker, Bernard L. G.; Ji, Chueng-Ryong

2014-01-01

316

Las clases medias republicanas en el franquismo: represión y control social  

Microsoft Academic Search

En este artículo se realiza una aproximación a las fases y diferentes formas de represión que sufrieron las personas de militancia republicana en los anos de la Guerra Civil. El trabajo se divide en tres partes. En la primera se trata de explicar, desde una perspectiva histórica, la vinculación entre clases medias y republicanismo. La segunda se centra especialmente en

Alicia Alted Vigil

2001-01-01

317

Mejoramiento de la gestión logística de las empresas afi liadas a Acoplásticos: diagnóstico y recomendaciones  

Microsoft Academic Search

El artículo presenta los resultados, diagnóstico, conclusiones y recomendaciones correspondientes a la investigación sobre las principales actividades logísticas de las empresas afi liadas a Acoplásticos, con énfasis en el sector de empaques y envases. Se realizó un estudio durante cerca de 10 meses, aprobado por la Asociación Colombiana de Industrias Plásticas (Acoplásticos) y con el apoyo fi nanciero de la

Fabio Novoa Rojas; Pilar Sepúlveda Calderón

2008-01-01

318

Aspectos macroeconómicos de las utilidades por compraventa de divisas de la cuenta especial de cambios  

Microsoft Academic Search

Este trabajo persigue dos objetivos. En primer lugar, se discute el origen de las utilidades por compraventa de divisas (UCVD) de la Cuenta Especial de Cambios (CEC) y la naturaleza de su trabajo al gobierno. En segundo término, se analizan los efectos macroeconómicos de la utilización de los recursos de las UCVD para la financiación del déficit del gobierno, haciendo

Armando Montenegro

1983-01-01

319

La regulación de los órganos de gobierno de las cajas de ahorros: consideraciones electorales  

Microsoft Academic Search

El presente trabajo supone un avance en la resolución de los problemas de elección social y reparto proporcional de las cajas de ahorros españolas. La regulación estatal y regional relativa a estas instituciones no resuelve adecuadamente los problemas en las elecciones a representantes a los órganos rectores de dichas entidades financieras. La elección de un método para un problema de

Santiago Carbó Valverde; Antonio Palomares Bautista; Victoriano Ramírez González

2004-01-01

320

Analysis of Large Area Synchronous Code-Division Multiple Access (LAS- CDMA).  

National Technical Information Service (NTIS)

Large area synchronous code-division multiple access (LAS-CDMA) is a proposed fourth generation cellular standard. Similar to cdma2000, the distinguishing feature of LAS-CDMA is the new set of spreading codes used to separate users in the wireless channel...

S. A. Brooks

2002-01-01

321

La Noche de las Brujas Module. Nivel Primario. [The Night of the Witches Module. Primary Level.  

ERIC Educational Resources Information Center

La Noche de las Brujas (Halloween) is the topic of this primary level unit. The objectives are to enable the child to: (1) draw scenery, using his imagination, about witches, castles, and devils; (2) write compositions on witches, devils, and Halloween; (3) explain the story "La Noche de las Brujas"; (4) tell about any adventures or incidents he…

Espinoza, Delia

322

Problem-Solving in Las Vegas: Students Are Building Skills and a Global Network.  

ERIC Educational Resources Information Center

Describes a project initiated at Silverado High School in Las Vegas, where students from Las Vegas and schools across the United States monitor the levels of radon in the atmosphere. Enables students to learn first hand about the collection, analysis, and interpretation of scientific data and to network with other students from the United States…

Budd, Gregory; Curry, Don

1995-01-01

323

La historia de los servicios públicos en las ciudades gallegas: un programa de investigación  

Microsoft Academic Search

El trabajo expone los objetivos y los resultados de un programa de investigación desarrollado desde hace una década en el seno de la Universidade da Coruña, en el que se analiza la implantación y desarrollo de los principales servicios públicos en las ciudades gallegas, desde una perspectiva histórica. Se parte de la constatación de la creciente importancia atribuida a las

Alberte Martínez López; Jesús Mirás Araujo

2007-01-01

324

Reflexiones sobre el sistema y las políticas de innovación del País Vasco  

Microsoft Academic Search

El primer capítulo de este documento compara el sistema de innovación vasco con el de otros países avanzados, basándose para ello en las estadísticas de I+D y en el indicador europeo de innovación (EIS). En segundo lugar, el sistema vasco se compara con el de otras regiones, basándose en las tipologías de regiones europeas y españolas elaboradas por el autor,

Mikel Navarro

325

Formación de clases de equivalencia aplicadas al aprendizaje de las notas musicales  

Microsoft Academic Search

Se llevaron a cabo tres experimentos de formación y ampliación de clases de equivalencia. En el pri- mero de ellos, con niños de 4-6 años de media como participantes, y aplicando la lógica de las clases de equivalencia al aprendizaje de los símbolos y sonidos musicales, se adquirieron las relaciones ne- cesarias para formar tres clases de equivalencia (do, mi,

Andrés García García; Cristóbal Bohórquez Zayas; Teresa Gutiérrez Domínguez

326

EFFECT OF SECONDARY EFFLUENTS ON EUTROPHICATION IN LAS VEGAS BAY, LAKE MEAD, NEVADA  

EPA Science Inventory

The eutrophication potential of Lake Mead, with primary emphasis on Las Vegas Bay, was determined with Selenastrum capricornutum. Nutrient limitation profiles were determined for three sampling stations in Las Vegas Bay and one in Boulder Basin. After heavy metals were chelated w...

327

Robots in Las Vegas: Demos and International Agency Panel Highlight NSF Robotics Workshop  

NSF Publications Database

... Oct. 26, 12:00 p.m. - 1:30 p.m. International panel: Oct. 26, 1:30 p.m. - 3:00 p.m. IROS 2003 ... 9:00 a.m. - 5:00 p.m. Where: Pacific Ballroom and Las Vegas Ballroom Bally's Hotel 3645 Las Vegas ...

328

REMOTE SENSING OF PERCHLORATE EFFECTS ON SALT CEDAR PRELIMINARY RESULTS FROM THE LAS VEGAS WASH  

EPA Science Inventory

Sodium Perchlorate and ammonium Perchlorate, major components of solid rocket fuel, have been manufactured in the Las Vegas Valley immediately up gradient from the Las Vegas Wash, since 1945 and 1956, respectively. Measurements of emerging ground water quality in the vici...

329

Nuclear Structure Studies with Exotic Nuclear Beams  

NASA Astrophysics Data System (ADS)

Secondary beams of unstable nuclei with kinetic energies of several hundred MeV/u are produced at GSI in fragmentation and fission reactions followed by in-flight isotope separation. The LAND detector setup is designed for studies of projectile breakup in peripheral collisions induced, e.g., by nucleon knockout or Coulomb dissociation. At present, the experiments focus on deriving spectroscopic information for neutron-rich isotopes ranging from light nuclei at the drip line to medium-heavy nuclei; selected aspects and results are discussed. The exotic nuclear beam facility planned as an integral part of the FAIR (Facility for Antiproton and Ion research) project at GSI promises much improved conditions and allows for novel techniques in experimental investigations of nuclei far away from stability. The perspectives are briefly addressed.

Emling, H.

2005-11-01

330

Nuclear Structure Studies with Exotic Nuclear Beams  

SciTech Connect

Secondary beams of unstable nuclei with kinetic energies of several hundred MeV/u are produced at GSI in fragmentation and fission reactions followed by in-flight isotope separation. The LAND detector setup is designed for studies of projectile breakup in peripheral collisions induced, e.g., by nucleon knockout or Coulomb dissociation. At present, the experiments focus on deriving spectroscopic information for neutron-rich isotopes ranging from light nuclei at the drip line to medium-heavy nuclei; selected aspects and results are discussed.The exotic nuclear beam facility planned as an integral part of the FAIR (Facility for Antiproton and Ion research) project at GSI promises much improved conditions and allows for novel techniques in experimental investigations of nuclei far away from stability. The perspectives are briefly addressed.

Emling, H. [Gesellschaft fuer Schwerionenforschung (GSI), Darmstadt (Germany)

2005-11-21

331

Nuclear power and nuclear weapons: the connection is dangerous  

Microsoft Academic Search

Part one of a two-part article points out that responsible nuclear advocates recognized the proliferation risks associated with the benefits of nuclear power and that the weapons connection should be included in the evaluation of energy-strategy choices. Analysts who emphasize only political motivations for acquiring nuclear weapons ignore the technical and economic barriers that can slow their spread, as well

Holdren

1983-01-01

332

United Campuses to Prevent Nuclear War: Nuclear War Course Summaries.  

ERIC Educational Resources Information Center

Briefly describes 46 courses on nuclear war available from United Campuses to Prevent Nuclear War (UCAM). These courses are currently being or have been taught at colleges/universities, addressing effects of nuclear war, arms race history, new weapons, and past arms control efforts. Syllabi (with assignments/reading lists) are available from UCAM.…

Journal of College Science Teaching, 1983

1983-01-01

333

Weak Nuclear Forces cause the Strong Nuclear Force  

SciTech Connect

We determine the strength of the weak nuclear force which holds the lattices of the elementary particles together. We also determine the strength of the strong nuclear force which emanates from the sides of the nuclear lattices. The strong force is the sum of the unsaturated weak forces at the surface of the lattices.

Koschmieder, E. L. [Center for Statistical Mechanics, University of Texas at Austin, Austin TX 78712 (United States)

2008-05-29

334

Nuclear Reactor Safety.  

National Technical Information Service (NTIS)

This report presents blind pretest predictions of the nuclear LOFT test L2-3 performed with the TRA code, and SIMMER-II analysis of the transition phase behavior of a single LMFBR subassembly. In the gas-cooled reactor area, work continued in support of t...

J. F. Jackson M. G. Stevenson

1979-01-01

335

Nuclear and radiochemical analysis  

SciTech Connect

This is the fourth in a series of periodic reviews on the subject of nuclear and radiochemical analysis. The review covers material found in books and journals concerning radiochemical, neutron activation, charged-particle activation, ion beam, isotope dilution, direct counting, transmission, attenuation, scattering, tracer, and isotopic dating methods.

Ehmann, W.D.; Robertson, J.D.; Yates, S.W. [Univ. of Kentucky, Lexington, KY (United States)

1992-06-15

336

Restructuring nuclear regulations.  

PubMed Central

Nuclear regulations are a subset of social regulations (laws to control activities that may negatively impact the environment, health, and safety) that concern control of ionizing radiation from radiation-producing equipment and from radioactive materials. The impressive safety record among nuclear technologies is due, in no small part, to the work of radiation safety professionals and to a protection system that has kept pace with the rapid technologic advancements in electric power generation, engineering, and medicine. The price of success, however, has led to a regulatory organization and philosophy characterized by complexity, confusion, public fear, and increasing economic costs. Over the past 20 years, regulatory costs in the nuclear sector have increased more than 250% in constant 1995 U.S. dollars. Costs of regulatory compliance can be reduced sharply, particularly when health and environmental benefits of risk reduction are questionable. Three key regulatory areas should be closely examined and modified to improve regulatory effectiveness and efficiency: a) radiation protection should be changed from a risk-based to dose-based system; b) the U.S. government should adopt the modern metric system (International System of Units), and radiation quantities and units should be simplified to facilitate international communication and public understanding; and c) a single, independent office is needed to coordinate nuclear regulations established by U.S. federal agencies and departments.

Mossman, Kenneth L

2003-01-01

337

Nuclear MHD Converter.  

National Technical Information Service (NTIS)

This work originates from the proposal MHD Compressor-Expander Conversion System Integrated with a GCR Inside a Deployable Reflector submitted by ANSALDO under PRDA RA-22-87PC90271, January 1987. The proposal concerned an innovative concept of nuclear, cl...

G. Tuninetti E. Botta C. Criscuolo P. Riscossa F. Giammanco

1989-01-01

338

Nuclear Power in Japan.  

ERIC Educational Resources Information Center

Energy consumption in Japan has grown at a faster rate than in any other major industrial country. To maintain continued prosperity, the government has embarked on a crash program for nuclear power. Current progress and issues/reactions to the plan are discussed. (JN)

Powell, John W.

1983-01-01

339

Nuclear spin circular dichroism  

NASA Astrophysics Data System (ADS)

Recent years have witnessed a growing interest in magneto-optic spectroscopy techniques that use nuclear magnetization as the source of the magnetic field. Here we present a formulation of magnetic circular dichroism (CD) due to magnetically polarized nuclei, nuclear spin-induced CD (NSCD), in molecules. The NSCD ellipticity and nuclear spin-induced optical rotation (NSOR) angle correspond to the real and imaginary parts, respectively, of (complex) quadratic response functions involving the dynamic second-order interaction of the electron system with the linearly polarized light beam, as well as the static magnetic hyperfine interaction. Using the complex polarization propagator framework, NSCD and NSOR signals are obtained at frequencies in the vicinity of optical excitations. Hartree-Fock and density-functional theory calculations on relatively small model systems, ethene, benzene, and 1,4-benzoquinone, demonstrate the feasibility of the method for obtaining relatively strong nuclear spin-induced ellipticity and optical rotation signals. Comparison of the proton and carbon-13 signals of ethanol reveals that these resonant phenomena facilitate chemical resolution between non-equivalent nuclei in magneto-optic spectra.

Vaara, Juha; Rizzo, Antonio; Kauczor, Joanna; Norman, Patrick; Coriani, Sonia

2014-04-01

340

Nuclear spin circular dichroism.  

PubMed

Recent years have witnessed a growing interest in magneto-optic spectroscopy techniques that use nuclear magnetization as the source of the magnetic field. Here we present a formulation of magnetic circular dichroism (CD) due to magnetically polarized nuclei, nuclear spin-induced CD (NSCD), in molecules. The NSCD ellipticity and nuclear spin-induced optical rotation (NSOR) angle correspond to the real and imaginary parts, respectively, of (complex) quadratic response functions involving the dynamic second-order interaction of the electron system with the linearly polarized light beam, as well as the static magnetic hyperfine interaction. Using the complex polarization propagator framework, NSCD and NSOR signals are obtained at frequencies in the vicinity of optical excitations. Hartree-Fock and density-functional theory calculations on relatively small model systems, ethene, benzene, and 1,4-benzoquinone, demonstrate the feasibility of the method for obtaining relatively strong nuclear spin-induced ellipticity and optical rotation signals. Comparison of the proton and carbon-13 signals of ethanol reveals that these resonant phenomena facilitate chemical resolution between non-equivalent nuclei in magneto-optic spectra. PMID:24712776

Vaara, Juha; Rizzo, Antonio; Kauczor, Joanna; Norman, Patrick; Coriani, Sonia

2014-04-01

341

Nuclear Melatonin Receptors  

Microsoft Academic Search

Current opinions on the potential role of orphan nuclear retinoid receptors of the ROR\\/RZR subfamily in regulatory activities of the pineal gland hormone melatonin are reviewed. The mechanisms of receptor–DNA interactions and known coactivators, tissue peculiarities of the expression of different receptor isoforms, and its regulation are described. The spectrum of probable targets for regulation by the receptors, the most

A. N. Smirnov

2001-01-01

342

Viewpoints on Nuclear Education.  

ERIC Educational Resources Information Center

The Committee on the Present Danger, Inc., the Committee of Atomic Bomb Survivors in the United States, the World Friendship Center in Hiroshima, two authors, physics and education professors, an English and history teacher, and a high school student comment on nuclear education. (RM)

Social Education, 1983

1983-01-01

343

Nuclear Medicine Imaging System.  

National Technical Information Service (NTIS)

It is an object of this invention to provide a nuclear imaging system having the versatility to do positron annihilation studies, rotating single or opposed camera gamma emission studies, and orthogonal gamma emission studies. It is a further object of th...

G. W. Bennett A. B. Brill Y. J. C. Bizais R. W. Rowe I. G. Zubal

1983-01-01

344

Evaluated nuclear data library  

SciTech Connect

The Lawrence Livermore National Laboratory (LLNL) collection of evaluated data for neutron-, photon-, and charged-particle-induced reactions is maintained in a computer-oriented system. In this report we recount the history of Evaluated Nuclear Data Library, describe the methods of evaluation, and give examples of input and output representation of the data.

Howerton, R.J.; Dye, R.E.; Perkins, S.T.

1981-10-08

345

Nuclear pumped laser modeling  

Microsoft Academic Search

A model for an indirectly nuclear pumped laser experiment was developed. The apparatus consists of the usual cylindrical neutron moderator enclosing a gas filled quartz cell. The quartz cell in this case has two concentric compartments; the larger output compartment is filled with He-3 and fluorescent gases which are coupled radiatively to the inner compartment which is filled with a

J. W. Wilson; A. Shapiro

1979-01-01

346

Nuclear criticality accidents  

Microsoft Academic Search

Criticality occurs when a sufficient quantity of fissionable material is accumulated, and it results in the liberation of nuclear energy. All process accidents have involved plutonium or highly enriched uranium, as have most of the critical experiment accidents. Slightly enriched uranium systems require much larger quantities of material to achieve criticality. An appreciation of criticality accidents should be based on

1991-01-01

347

Nuclear Waste Education Project  

SciTech Connect

In summary, both the Atlanta and Albuquerque pilot seminars achieved the Nuclear Waste Education Project's goal of informing citizens on both the substance and the process of nuclear waste policy so that they can better participate in future nuclear waste decisions. Nuclear waste issues are controversial, and the seminars exposed the nature of the controversy, and utilized the policy debates to create lively and provocative sessions. The format and content of any citizen education curriculum must be made to fit the particular goal that has been chosen. If the Department of Energy and the LWVEF decide to continue to foster an informed dialogue among presenters and participants, the principles of controversial issues education would serve this goal well. If, however, the Department of Energy and/or the LWVEF decide to go beyond imparting information and promoting a lively discussion of the issues, towards some kind of consensus-building process, it would be appropriate to integrate more interactive sessions into the format. As one evaluator wrote, In-depth participation in finding solutions or establishing policy -- small group discussion'' would have been preferable to the plenary sessions that mostly were in the form of lectures and expert panel discussion. The evaluator continued by saying, Since these (small group discussions) would require more time commitment, they might be part of follow-up workshops focused on particular topics.''

Not Available

1989-01-01

348

Correlations in Nuclear Masses  

SciTech Connect

It was recently suggested that the error with respect to experimental data in nuclear mass calculations is due to the presence of chaotic motion. The theory was tested by analyzing the typical error size. A more sensitive quantity, the correlations of the mass error between neighboring nuclei, is studied here. The results provide further support to this physical interpretation.

Olofsson, H.; Aaberg, S. [Division of Mathematical Physics, LTH, Lund University, P.O. Box 118, S-221 00 Lund (Sweden); Bohigas, O.; Leboeuf, P. [Laboratoire de Physique Theorique et Modeles Statistiques, Batiment 100, Universite de Paris-Sud, 91405 Orsay Cedex (France)

2006-02-03

349

Nuclear reactor dip seal  

Microsoft Academic Search

Arrangements are provided for sealing cover gas from the clearance spaces among primary vessel head structure components in a liquid metal cooled fast breeder nuclear reactor. These include a dip seal having a trough and blade respectively suspended from adjacent head structure components, such as rotatable plugs, the trough and blade extending downward to an elevation below the operating level

J. M. Kazan; J. E. Sharbaugh

1982-01-01

350

Nuclear arms for Iraq  

Microsoft Academic Search

This paper discusses documentary evidence that the UK government was aware that some of the components sold to Iraq by Matrix Churchill were likely to be used in the manufacture of nuclear weapons, and in permitting the sales were in breach of Article I of the Non?Proliferation Treaty. The reasons for permitting the sales and the possibility of the issue

Richard Lawson

1995-01-01

351

NUCLEAR POWER ECONOMICS  

Microsoft Academic Search

The cost of the fuel consumed in a nuclear power reactor is lower than ; that which is required in conventional power stations for the generation of the ; same amount of energy: this premise points to the conditions under which atomic ; energy becomes competitive with conventional thermal power. From the initial ; \\/lb ( .4\\/kg), the incentive price

Cassuto

1962-01-01

352

Nuclear Fuel Cycle Costs.  

National Technical Information Service (NTIS)

The costs for the back-end of the nuclear fuel cycle, which were developed as part of the Nonproliferation Alternative Systems Assessment Program (NASAP), are presented. Total fuel cycle costs are given for the pressurized water reactor once-through and f...

W. D. Burch M. J. Haire R. H. Rainey

1982-01-01

353

Nuclear fuel reprocessing  

Microsoft Academic Search

Reprocessing of spent nuclear fuel is a relatively simple, well-developed, and successful technology. Large, expensive reprocessing facilities are in use, principally in the UK and France, and are under construction in Japan and the CIS. As in most industrial processes, the viability of the process depends on the usefulness of its function and products, operational costs, and the economics of

Foreman

1992-01-01

354

Nuclear Reactors and Technology  

SciTech Connect

This publication Nuclear Reactors and Technology (NRT) announces on a monthly basis the current worldwide information available from the open literature on nuclear reactors and technology, including all aspects of power reactors, components and accessories, fuel elements, control systems, and materials. This publication contains the abstracts of DOE reports, journal articles, conference papers, patents, theses, and monographs added to the Energy Science and Technology Database during the past month. Also included are US information obtained through acquisition programs or interagency agreements and international information obtained through the International Energy Agency`s Energy Technology Data Exchange or government-to-government agreements. The digests in NRT and other citations to information on nuclear reactors back to 1948 are available for online searching and retrieval on the Energy Science and Technology Database and Nuclear Science Abstracts (NSA) database. Current information, added daily to the Energy Science and Technology Database, is available to DOE and its contractors through the DOE Integrated Technical Information System. Customized profiles can be developed to provide current information to meet each user`s needs.

Cason, D.L.; Hicks, S.C. [eds.

1992-01-01

355

Preserving Nuclear Grade Knowledge  

SciTech Connect

When people think of the government they think of the President, or Congress, or the Internal Revenue Service (IRS), but there are thousands of people in government-related jobs doing things most don’t really notice everyday. You can find them everywhere, from the space science folks at NASA, to the Federal Bureau of Investigations (FBI) watching out for the bad guys. There are Rangers, and Social Workers, Nurses and Agricultural Managers. They are people working to keep the many facets of the USA rolling. One very diverse bunch is The Department of Energy (DOE) , a group who is expanding the ways we make and save energy to power our cars, homes, and businesses. Tucked away under the DOE is the National Nuclear Security Administration, the NNSA is an agency that maintains the safety, security, and reliability of the U.S. nuclear weapons stockpile. It works to reduce global danger from weapons of mass destruction. It provides the U.S. Navy with safe nuclear propulsion, and it responds to nuclear and radiological emergencies in the United States and abroad, and it supports efforts in science and technology*. (* DOE/NNSA/KCP website info)

Lange, Bob

2008-02-05

356

Nuclear Electromagnetic Pulse Review  

Microsoft Academic Search

Electromagnetic Pulse (EMP) from nuclear detonations have been observed for well over half a century. Beginning in the mid-to-late 1950s, the physics and modeling of EMP has been researched and will continue into the foreseeable future. The EMP environment propagates hundreds of miles from its origins and causes interference for all types of electronic instrumentation. This includes military, municipal and

Michael Dinallo

2011-01-01

357

Nuclear Power in Space.  

ERIC Educational Resources Information Center

Research has shown that nuclear radioisotope power generators can supply compact, reliable, and efficient sources of energy for a broad range of space missions. These missions range from televising views of planetary surfaces to communicating scientific data to Earth. This publication presents many applications of the advancing technology and…

Department of Energy, Washington, DC. Nuclear Energy Office.

358

Controlled Nuclear Fusion.  

ERIC Educational Resources Information Center

This publication is one of a series of information booklets for the general public published by The United States Atomic Energy Commission. Among the topics discussed are: Importance of Fusion Energy; Conditions for Nuclear Fusion; Thermonuclear Reactions in Plasmas; Plasma Confinement by Magnetic Fields; Experiments With Plasmas; High-Temperature…

Glasstone, Samuel

359

A nuclear magnetometer  

Microsoft Academic Search

The basic principles of the nuclear free precession magnetometer are briefly described, and full details given of the coils, switching circuits and transistorized amplifying equipment of such a magnetometer. Accuracy of absolute measurement of the earth's total field is ±10 ?G, and even better when only relative measurements are required. Setting-up of the instrument, which requires no calibration, and taking

G. S. Waters; P. D. Francis

1958-01-01

360

Nuclear Magnetic Resonance Gyroscope  

NASA Astrophysics Data System (ADS)

The navigation grade micro Nuclear Magnetic Resonance Gyroscope (micro-NMRG) being developed by the Northrop Grumman Corporation is concluding the fourth and final phase of the DARPA Navigation Grade Integrated Micro Gyro (NGIMG) program. Traditional MEMS gyros utilize springs as an inherent part of the sensing mechanism, leading to bias and scale factor sensitivity to acceleration and vibration. As a result, they have not met performance expectations in real world environments and to date have been limited to tactical grade applications. The Nuclear Magnetic Resonance Gyroscope (NMRG) utilizes the fixed precession rate of a nuclear spin in a constant magnetic field as an inertial reference for determining rotation. The nuclear spin precession rate sensitivity to acceleration and vibration is negligible for most applications. Therefore, the application of new micro and batch fabrication methods to NMRG technology holds great promise for navigation grade performance in a low cost and compact gyro. This poster will describe the history, operational principles, and design basics of the NMRG including an overview of the NSD designs developed and demonstrated in the DARPA gyro development program. General performance results from phases 3 and 4 will also be presented.

Bulatowicz, Michael; Clark, Philip; Griffith, Robert; Larsen, Michael; Mirijanian, James

2012-06-01

361

Radiocarbon from Nuclear Tests  

Microsoft Academic Search

As a result of the generation of neutrons in nuclear tests and their ; subsequent reaction with nitrogen in the atmosphere, considerable man-made C\\/sup ; 14\\/ has been added to the earth's dynamic carbon reservoir. On the basis of the ; measured neutron yield per unit energy release and on the assumption that about ; two-thirds of the C¹⁴ produced

Wallace S. Broecker; Alan Walton

1959-01-01

362

JPRS report, nuclear developments  

SciTech Connect

This report contains articles concerning the nuclear developments of the following countries: (1) China; (2) Japan, North Korea, South Korea; (3) Bulgaria, Czechoslovakia, Rumania; (4) Argentina, Brazil, Peru; (5) India, Iraq, Syria, Israel, Egypt, Mauritania, Pakistan; (6) Soviet Union; (7) France, Germany, Austria, Canada, Italy, Spain; and (8) South Africa.

NONE

1991-01-04

363

Highlights in Nuclear Physics  

NASA Astrophysics Data System (ADS)

According to a short and interrupted tradition, the outgoing chair of the DNP is invited to present a sage perspective on recent exciting developments in the field. It is easy to find examples of such progress. I will select just a few, and try to describe them in a manner that does justice to the creativity and hard work of the nuclear physicists involved.

Glashausser, Charles

2004-05-01

364

Nuclear fuel assembly spacer  

SciTech Connect

In a fuel assembly for a nuclear reactor a fuel element spacer formed of an array of laterally positioned cojoined tubular ferrules each providing a passage for one of the fuel elements, the elements being laterally supported in the ferrules between slender spring members and laterally oriented rigid stops.

Matzner, B.; Curulla, M. V.; Horn, V. M.; Price, J. F.

1985-04-02

365

Nuclear reactor spacer grid  

Microsoft Academic Search

A nuclear fuel assembly is described containing cylindrical fuel rods having an outside radius and comprising: a top nozzle; a bottom nozzle; a control rod guide thimble extending between the top and bottom nozzles; fuel rod spacer grid assemblies axially disposed along the control rod guide thimble for maintaining the fuel rods in a space lateral array. Each of the

L. E. Weiland; B. H. Parks

1987-01-01

366

Washington: Hanford Nuclear Reservation  

... "before and after" views of the area around the Hanford Nuclear Reservation near Richland, Washington. On June 27, 2000, a fire in the ... since 1996. MISR was built and is managed by NASA's Jet Propulsion Laboratory, Pasadena, CA, for NASA's Science Mission Directorate, ...

2013-04-18

367

Nuclear cardiograph and scintigraphy  

NASA Technical Reports Server (NTRS)

Extensive advances in the technology of detectors, data analysis systems, and tracers used have resulted in greatly expanded applications of radioisotopes to the assessment of cardiac function and disease. The development of nuclear cardiology has proceeded along four lines: (1) radionuclide angiography, (2) myocardial perfusion imaging, (3) intracoronary microsphere imaging, and (4) regional myocardial blood flow determination using inert gases.

Mclaughlin, P.

1975-01-01

368

JPRS report, nuclear developments  

SciTech Connect

This report contains articles concerning the nuclear developments of the following countries: (1) China; (2) Japan, North Korea, South Korea, Taiwan; (3) Bulgaria, Czechoslovakia, Yugoslavia; (4) Argentina, Brazil, Panama; (5) India, Iran, Pakistan, Israel, Afghanistan; (6) Soviet Union; (7) France, Germany, Turkey, Belgium, Canada, Netherlands, Switzerland, United Kingdom; and (8) South Africa.

NONE

1991-03-19

369

Beloyarsk Nuclear Power Plant  

SciTech Connect

The Beloyarsk Nuclear Power Plant (BNPP) is located in Zarechny, approximately 60 km east of Ekaterinberg along the Trans-Siberian Highway. Zarechny, a small city of approximately 30,000 residents, was built to support BNPP operations. It is a closed city to unescorted visitors. Residents must show identification for entry. BNPP is one of the first and oldest commercial nuclear power plants in Russia and began operations in 1964. As for most nuclear power plants in the Russian Federation, BNPP is operated by Rosenergoatom, which is subordinated to the Ministry of Atomic Energy of the Russian Federation (Minatom). BNPP is the site of three nuclear reactors, Units 1, 2, and 3. Units 1 and 2, which have been shut-down and defueled, were graphite moderated reactors. The units were shut-down in 1981 and 1989. Unit 3, a BN-600 reactor, is a 600 MW(electric) sodium-cooled fast breeder reactor. Unit 3 went on-line in April 1980 and produces electric power which is fed into a distribution grid and thermal power which provides heat to Zarechny. The paper also discusses the SF NIKIET, the Sverdiovsk Branch of NIKIET, Moscow, which is the research and development branch of the parent NIKEIT and is primarily a design institute responsible for reactor design. Central to its operations is a 15 megawatt IVV research reactor. The paper discusses general security and fissile material control and accountability at these two facilities.

NONE

1997-08-01

370

Nuclear waste solutions  

DOEpatents

High efficiency removal of technetium values from a nuclear waste stream is achieved by addition to the waste stream of a precipitant contributing tetraphenylphosphonium cation, such that a substantial portion of the technetium values are precipitated as an insoluble pertechnetate salt.

Walker, Darrel D. (1684 Partridge Dr., Aiken, SC 29801); Ebra, Martha A. (129 Hasty Rd., Aiken, SC 29801)

1987-01-01

371

Nuclear Reactor Safety  

Microsoft Academic Search

Nuclear Reactor Safety (NRS), published monthly, is a collection of abstracts of worldwide information available on all safety-related aspects of reactors, including accident analysis, safety systems, radiation protection, decommissioning and dismantling, and security measures. This publication contains the abstracts of DOE reports, journal articles, conference papers, patents, theses, and monographs added to the Energy Science and Technology Database during the

J. D. Bales; R. Boshears

1996-01-01

372

Nuclear reactor safety device  

Microsoft Academic Search

A safety device is described for use in a nuclear reactor for axially repositioning a control rod with respect to the reactor core in the event of a thermal excursion. It comprises a laminated strip helically configured to form a tube, said tube being in operative relation to said control rod. The laminated strip is formed of at least two

Hutter

1983-01-01

373

Nuclear reactor safety  

Microsoft Academic Search

It has been remarked that all technology is a Faustian bargain. Man obtains conveniences and sometimes luxuries, but in exchange he sets an increased potential for catastrophe. The more successful a techology is, the more man depends on it, and the higher the stakes become. Nowhere does this cautious view of technology apply better than to nuclear energy. There is

J. Primack; F. Von Hippel

1984-01-01

374

NUCLEAR REACTOR SAFETY SYSTEMS  

Microsoft Academic Search

A nuclear reactor safety system is designed to provide an automatic ; safeguard for the reactor under fault conditions. It is also important that the ; safety system does not generate faults of its own. The basic layout of a safety ; system is described, and it is shown that application of the principles of ; coincidence and redundancy to

Jervis

1962-01-01

375

Nuclear reactor safety  

Microsoft Academic Search

An account is given of the basic physics and engineering underlying the design of nuclear reactors, descriptions of the types of reactor currently operating, the principles of reactor fault detection and control, safety analysis and hazards assessment. The more serious hypothetical accidents are reviewed for water cooled and gas cooled reactors and for the liquid metal cooled fast breeder reactor.

J. L. Head; A. J. H. Goddard; P. J. Grant

1979-01-01

376

Nuclear reactor safety device  

Microsoft Academic Search

In a nuclear reactor having a core, a coolant for contacting and cooling the core, at least one control rod movable axially relative to the core for varying the power output of the reactor, and control means for moving the control rod to regulate the power output, a safety device is described to afford additional protection against an upward thermal

Hutter

1986-01-01

377

Nuclear reactor safety device  

Microsoft Academic Search

A safety device is disclosed for use in a nuclear reactor for axially repositioning a control rod with respect to the reactor core in the event of an upward thermal excursion. Such safety device comprises a laminated helical ribbon configured as a tube-like helical coil having contiguous helical turns with slidably abutting edges. The helical coil is disclosed as a

Hutter; Ernest

1986-01-01

378

Producing Nuclear Power  

ERIC Educational Resources Information Center

There is a potential crisis looming related to the world's need for energy. On the one hand, energy demands are growing every day, and could double by 2050. On the other hand, burning of traditional fossil fuels to generate electricity is contributing to the increase in greenhouse gases. Would it be advisable to increase the number of nuclear…

Childress, Vincent W.

2010-01-01

379

Chiral nuclear thermodynamics  

NASA Astrophysics Data System (ADS)

We calculate the equation of state of nuclear matter for arbitrary isospin-asymmetry up to three loop order in the free energy density in the framework of in-medium chiral perturbation theory. In our approach 1?- and 2?-exchange dynamics with the inclusion of the ?-isobar excitation as an explicit degree of freedom, corresponding to the long- and intermediate-range correlations, are treated explicitly. Few contact terms fixed to reproduce selected known properties of nuclear matter encode the short-distance physics. Two-body as well as three-body forces are systematically included. We find a critical temperature of about 15 MeV for symmetric nuclear matter. We investigate the dependence of the liquid-gas first-order phase transition on isospin-asymmetry. In the same chiral framework we calculate the chiral condensate of isospin-symmetric nuclear matter at finite temperatures. The contribution of the ?-isobar excitation is essential for stabilizing the condensate. As a result, we find no indication of a chiral phase transition for densities ??2?0 and at temperatures T?100 MeV.

Fiorilla, S.; Kaiser, N.; Weise, W.

2012-04-01

380

Nuclear proliferation: who's next  

SciTech Connect

Unsettling developments in the past 18 months could lead to nuclear competition and terrorism in the world's least-stable regions. US efforts to stop the proliferation of nuclear weapons seem ineffective in view of such unsettling developments, especially among the states whose programs are most advanced. The task is more difficult than it was a decade ago. Then the policy of export restraint on the part of nuclear supplier countries formed the basis for a unified strategy that helped retard proliferation across the board. Today each country on the nuclear threshold must be addressed individually, taking into account its unique regional concerns and its particular relations with the US. If there is a unifying thread to US efforts to stop proliferation, it is that these have become increasingly political and diplomatic. In such a setting it is all the more important to make nonproliferation a top priority on the US foreign policy agenda. Unfortunately, other concerns have eclipsed nonproliferation in the recent past. The effect of that neglect is increasingly evident. 9 references, 1 figure, 1 table.

Spector, L.S.

1987-05-01

381

Nuclear thermal propulsion  

NASA Technical Reports Server (NTRS)

This document is presented in viewgraph form, and the topics covered include the following: (1) the direct fission-thermal propulsion process; (2) mission applications of direct fission-thermal propulsion; (3) nuclear engines for rocket vehicles; (4) manned mars landers; and (5) particle bed reactor design.

Bennett, Gary L.

1991-01-01

382

Nuclear fuel element  

Microsoft Academic Search

A nuclear fuel element is provided which comprises a cladding tube having end plugs for sealing ends of the cladding tube and a multiplicity of fuel pellets stacked within the cladding tube. Each of the fuel pellets has a substantially cylindrical external lateral surface and a plurality of longitudinal recesses having rounded root portions on the external lateral surface, and

K. Domoto; K. Hayashi

1981-01-01

383

Nuclear testing: Executive summary  

SciTech Connect

The authors have examined the experimental and analytic bases for understanding the performance of each of the weapon types that are currently planned to remain in the US enduring nuclear stockpile. They have also examined whether continued underground tests at various nuclear yield thresholds would add significantly to the confidence in this stockpile in the years ahead. The starting point for this examination was a detailed review of past experience in developing and testing modern nuclear weapons, their certification and recertification processes, their performance margins, and evidence of aging or other trends over time for each weapon type in the enduring stockpile. The findings, as summarized in Conclusions 1 through 6, are consistent with US agreement to enter into a Comprehensive Test Ban Treaty (CTBT) of unending duration, that includes a standard ``supreme national interest`` clause. Recognizing that the challenge of maintaining an effective nuclear stockpile for an indefinite period without benefit of underground tests is an important and also a new one, the US should affirm its readiness to invoke the supreme national interest clause should the need arise as a result of unanticipated technical problems in the enduring stockpile.

Drell, S.; Cornwall, J.; Dyson, F. [and others

1995-08-01

384

Nuclear Fuel Reprocessing  

SciTech Connect

Reprocessing is essential to closing nuclear fuel cycle. Natural uranium contains only 0.7 percent 235U, the fissile (see glossary for technical terms) isotope that produces most of the fission energy in a nuclear power plant. Prior to being used in commercial nuclear fuel, uranium is typically enriched to 3–5% in 235U. If the enrichment process discards depleted uranium at 0.2 percent 235U, it takes more than seven tonnes of uranium feed to produce one tonne of 4%-enriched uranium. Nuclear fuel discharged at the end of its economic lifetime contains less one percent 235U, but still more than the natural ore. Less than one percent of the uranium that enters the fuel cycle is actually used in a single pass through the reactor. The other naturally occurring isotope, 238U, directly contributes in a minor way to power generation. However, its main role is to transmute into plutoniumby neutron capture and subsequent radioactive decay of unstable uraniumand neptuniumisotopes. 239Pu and 241Pu are fissile isotopes that produce more than 40% of the fission energy in commercially deployed reactors. It is recovery of the plutonium (and to a lesser extent the uranium) for use in recycled nuclear fuel that has been the primary focus of commercial reprocessing. Uraniumtargets irradiated in special purpose reactors are also reprocessed to obtain the fission product 99Mo, the parent isotope of technetium, which is widely used inmedical procedures. Among the fission products, recovery of such expensive metals as platinum and rhodium is technically achievable, but not economically viable in current market and regulatory conditions. During the past 60 years, many different techniques for reprocessing used nuclear fuel have been proposed and tested in the laboratory. However, commercial reprocessing has been implemented along a single line of aqueous solvent extraction technology called plutonium uranium reduction extraction process (PUREX). Similarly, hundreds of types of reactor fuels have been irradiated for different purposes, but the vast majority of commercial fuel is uranium oxide clad in zirconium alloy tubing. As a result, commercial reprocessing plants have relatively narrow technical requirements for used nuclear that is accepted for processing.

Harold F. McFarlane; Terry Todd

2013-11-01

385

Psychoanalysis and the nuclear threat  

SciTech Connect

{ital Psychoanalysis and the Nuclear Threat} provides coverage of the dynamic and clinical considerations that follow from life in the nuclear age. Of special clinical interest are chapters dealing with the developmental consequences of the nuclear threat in childhood, adolescence, and adulthood, and those exploring the technical issues raised by the occurrence in analytic and psychotherapeutic hours of material related to the nuclear threat. Additional chapters bring a psychoanalytic perspective to bear on such issues as the need to have enemies, silence as the real crime, love, work, and survival in the nuclear age, the relationship of the nuclear threat to issues of mourning and melancholia, apocalyptic fantasies, the paranoid process, considerations of the possible impact of gender on the nuclear threat, and the application of psychoanalytic thinking to nuclear arms strategy. Finally, the volume includes the first case report in the English language---albeit a brief psychotherapy---involving the treatment of a Hiroshima survivor.

Levine, H.B.; Jacobs, D.; Rubin, L.J.

1988-01-01

386

A Career in Nuclear Energy  

SciTech Connect

Nuclear chemist Dr. Marsha Lambregts talks about the Center for Advanced Energy Studies and the benefits of a nuclear energy career. For more information about careers at INL, visit http://www.facebook.com/idahonationallaboratory.

Lambregts, Marsha

2009-01-01

387

Modulating Nuclear Receptor Coactivator Binding.  

National Technical Information Service (NTIS)

The present invention comprises cocrystal of a nuclear receptor comprising a molecule bound to the coactivator binding site of said nuclear receptor. The present invention further comprises a machine-readable data storage medium encoded with machine reada...

B. Darimont J. D. Baxter P. J. Kushner R. J. Fletterick W. Feng

2005-01-01

388

Nuclear Proliferation and Grand Challenges  

SciTech Connect

Nuclear engineer Dr. Kathy McCarthy leads systems analysis. She talks about proliferation and the grand challenges of nuclear R&D. For more information about INL energy research, visit http://www.facebook.com/idahonationallaboratory.

McCarthy, Kathy

2009-01-01

389

Nuclear Proliferation and Grand Challenges  

ScienceCinema

Nuclear engineer Dr. Kathy McCarthy leads systems analysis. She talks about proliferation and the grand challenges of nuclear R&D. For more information about INL energy research, visit http://www.facebook.com/idahonationallaboratory.

McCarthy, Kathy

2013-05-28

390

Research in theoretical nuclear physics  

SciTech Connect

The work done during the past year covers three separate areas, low energy nuclear reactions intermediate energy physics, and nuclear structure studies. This manuscript summarizes our achievements made in these three areas.

Udagawa, T.

1991-10-01

391

Adventures in scientific nuclear diplomacy  

NASA Astrophysics Data System (ADS)

A former director of Los Alamos National Laboratory offers a first-person perspective on the important contributions scientists can make toward improving the safety and security of nuclear materials and reducing the global nuclear dangers in an evolving world.

Hecker, Siegfried S.

2014-05-01

392

The Nuclear Debate in Film  

ERIC Educational Resources Information Center

Provides a nuclear film bibliography grouped into the areas of: building and using the bomb; living with the bomb; and living with nuclear power. These films are for mature high school students and older. (MLH)

Dowling, John

1977-01-01

393

A Career in Nuclear Energy  

ScienceCinema

Nuclear chemist Dr. Marsha Lambregts talks about the Center for Advanced Energy Studies and the benefits of a nuclear energy career. For more information about careers at INL, visit http://www.facebook.com/idahonationallaboratory.

Lambregts, Marsha

2013-05-28

394

Nuclear thermal propulsion program overview  

NASA Technical Reports Server (NTRS)

Nuclear thermal propulsion program is described. The following subject areas are covered: lunar and Mars missions; national space policy; international cooperation in space exploration; propulsion technology; nuclear rocket program; and budgeting.

Bennett, Gary L.

1991-01-01

395

Nuclear thermal propulsion technology overview  

NASA Technical Reports Server (NTRS)

Viewgraphs on nuclear thermal propulsion technology overview are presented. Topics covered include non-nuclear material; instrumentation, controls, and health monitoring; turbopumps; nozzle and extension; and exhaust plume characteristics.

Stone, James R.

1993-01-01

396

Childhood leukemia around nuclear facilities.  

National Technical Information Service (NTIS)

This Information Bulletin highlights the conclusion made from an Atomic Energy Control Board of Canada (AECB) study on the incidence of childhood leukemia near nuclear facilities. All of the locations with the nuclear facilities are located in Ontario, th...

1991-01-01

397

Nuclear Radiation and the Thyroid  

MedlinePLUS

... and other organs working as they should. Most nuclear accidents release radioactive iodine into the atmosphere which ... works? After the 1986 Chornobyl (formerly called “Chernobyl”) nuclear accident, shifting winds blew a radioactive cloud over ...

398

American Society of Nuclear Cardiology  

MedlinePLUS

... Now! About ASNC About the Foundation Governance About Nuclear Cardiology Staff Contact ASNC Membership Join ASNC Renew ... Fellows Designation (FASNC) Leadership Development Program Member Directory Nuclear Cardiology Working Groups Technologist Month News & Publications Press ...

399

Managing Floods and Resources at the Arroyo Las Positas  

SciTech Connect

Engineers and water resource professionals are challenged with protecting facilities from flood events within environmental resource protection, regulatory, and economic constraints. One case in point is the Arroyo Las Positas (ALP), an intermittent stream that traverses the Lawrence Livermore National Laboratory (LLNL) in Livermore, California. Increased runoff from post-drought rainfall, upstream development, and new perennial discharges from LLNL activities have resulted in increased dry weather flows and wetland vegetation. These new conditions have recently begun to provide improved habitat for the federally threatened California red-legged frog (Rana aurora draytonii; CRLF), but the additional vegetation diminishes the channel's drainage capacity and increases flood risk. When LLNL proposed to re-grade the channel to reestablish the 100-year flood capacity, traditional dredging practices were no longer being advocated by environmental regulatory agencies. LLNL therefore designed a desilting maintenance plan to protect LLNL facility areas from flooding, while minimizing impacts to wetland resources and habitat. The result was a combination of structural upland improvements and the ALP Five Year Maintenance Plan (Maintenance Plan), which includes phased desilting in segments so that the entire ALP is desilted after five years. A unique feature of the Maintenance Plan is the variable length of the segments designed to minimize LLNL's impact on CRLF movement. State and federal permits also added monitoring requirements and additional constraints on desilting activities. Two years into the Maintenance Plan, LLNL is examining the lessons learned on the cost-effectiveness of these maintenance measures and restrictions and reevaluating the direction of future maintenance activities.

Sanchez, L; Van Hattem, M; Mathews, S

2002-03-05

400

Nuclear weapon detection categorization analysis  

SciTech Connect

This statement of work is for the Proof of Concept for nuclear weapon categories utility in Arms control. The focus of the project will be to collect, analyze and correlate Intrinsic Radiation (INRAD) calculation results for the purpose of defining measurable signatures that differentiate categories of nuclear weapons. The project will support START III negotiations by identifying categories of nuclear weapons. The categories could be used to clarify sub-limits on the total number of nuclear weapons.

NONE

1997-12-01

401

Direct nuclear-powered lasers  

NASA Technical Reports Server (NTRS)

The development of direct nuclear pumped lasers is reviewed. Theoretical and experimental investigations of various methods of converting the energy of nuclear fission fragments to laser power are summarized. The development of direct nuclear pumped lasers was achieved. The basic processes involved in the production of a plasma by nuclear radiation were studied. Significant progress was accomplished in this area and a large amount of basic data on plasma formation and atomic and molecular processes leading to population inversions is available.

Jalufka, N. W.

1983-01-01

402

Nuclear Propulsion in Space (1968)  

ScienceCinema

Project NERVA was an acronym for Nuclear Engine for Rocket Vehicle Application, a joint program of the U.S. Atomic Energy Commission and NASA managed by the Space Nuclear Propulsion Office (SNPO) at the Nuclear Rocket Development Station in Jackass Flats, Nevada U.S.A. Between 1959 and 1972, the Space Nuclear Propulsion Office oversaw 23 reactor tests, both the program and the office ended at the end of 1972.

None

2014-06-17

403

Nuclear Propulsion in Space (1968)  

SciTech Connect

Project NERVA was an acronym for Nuclear Engine for Rocket Vehicle Application, a joint program of the U.S. Atomic Energy Commission and NASA managed by the Space Nuclear Propulsion Office (SNPO) at the Nuclear Rocket Development Station in Jackass Flats, Nevada U.S.A. Between 1959 and 1972, the Space Nuclear Propulsion Office oversaw 23 reactor tests, both the program and the office ended at the end of 1972.

None

2012-06-23

404

75 FR 73135 - Southern Nuclear Operating Company, Inc. Joseph M. Farley Nuclear Plant, Environmental Assessment...  

Federal Register 2010, 2011, 2012, 2013

...Nuclear Operating Company, Inc. Joseph M. Farley Nuclear Plant, Environmental Assessment...licensee), for operation of the Joseph M. Farley Nuclear Plant, Units 1 and 2 (FNP...Renewal of Nuclear Plants: Joseph M. Farley Nuclear Plant, Units 1 and...

2010-11-29

405

Neutrino Nuclear Responses For Neutrino Studies In Nuclear Femto Laboratories  

SciTech Connect

Neutrinos are key particles for particle and astro-nuclear physics. Majorana neutrino masses and phases, solar and supernova neutrino productions and oscillations, and neutrino nuclear synthesis and fundamental weak interactions are well studied in nuclei as femto laboratories. Here neutrino nuclear responses are crucial for the neutrino studies. This reports briefly experimental studies of neutrino nuclear responses, charge exchange reactions on Ga to study nuclear responses for solar and {sup 51}Cr neutrinos, and {beta}{sup +} neutrino responses for {beta}{beta}-{nu} matrix elements and astro {nu} interactions by photon and muon probes.

Ejiri, H. [Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan and Nuclear Science, Czech Technical University, Brehova, Prague (Czech Republic)

2011-12-16

406

Nuclear Wallet Cards from the National Nuclear Data Center (NNDC)  

DOE Data Explorer

Nuclear Wallet Cards present properties for ground and isomeric states of all known nuclides. Properties given are: spin and parity assignments, nuclear mass excesses, half-life, isotopic abundances, and decay modes. Appendices contain properties of elements, fundamental constants and other useful information. Nuclear Wallet Cards booklet is published by the National Nuclear Data Center and its electronic (current) version is periodically updated. The Nuclear Wallet Cards by Dr. Jagdish K. Tuli, presently in its 8th edition, is distributed in print as well as in PDA-adaptable Palm Pilot format; the data table as an ASCII file is available upon request. [Taken from http://www.nndc.bnl.gov/wallet/

Tuli, Jagdish K.

407

Educators and the Nuclear Threat.  

ERIC Educational Resources Information Center

Discusses education's long-term role in preventing nuclear war and reports on a three-state survey of 118 high school seniors on their knowledge of nuclear war issues. Describes educational groups' activities around the issues and recounts the author's personal experiences at Hiroshima (Japan) and growing awareness of nuclear problems. (RW)

Elam, Stanley M.

1983-01-01

408

Overview paper on nuclear power  

SciTech Connect

This paper was prepared as an input to ORNL's Strategic Planning Activity, ORNL National Energy Perspective (ONEP). It is intended to provide historical background on nuclear power, an analysis of the mission of nuclear power, a discussion of the issues, the technology choices, and the suggestion of a strategy for encouraging further growth of nuclear power.

Spiewak, I.; Cope, D.F.

1980-09-01

409

Job Prospects for Nuclear Engineers.  

ERIC Educational Resources Information Center

As the debate over nuclear safety continues, the job market remains healthy for nuclear engineers. The average salary offered to new nuclear engineers with bachelor's degrees is $27,400. Salary averages and increases compare favorably with other engineering disciplines. Various job sources in the field are noted. (JN)

Basta, Nicholas

1985-01-01

410

Nuclear power: An economic geography  

Microsoft Academic Search

This book presents a major study of the economic and social geography of nuclear power. Starting with descriptions of the distribution of nuclear power on a national and international level using maps and graphs, the book goes on to discuss a whole range of topics ranging from reactor design to the socio-economic impact of nuclear power stations. The book discuses

Mounfield

1988-01-01

411

Is nuclear energy economically viable  

Microsoft Academic Search

An attempt is made to estimate the cost of electric energy generated both from coal- and nuclear-fired capacity in 1990. Regression equations are used to estimate capital costs for coal and nuclear capacity from 1980 to 1990. Estimated costs in 1990 of energy from the nuclear and coal plants under alternative SO2 control scenarios and at alternative capacity factors are

L. J. Perl

1976-01-01

412

Nuclear fuel stress corrosion prevention  

Microsoft Academic Search

Nuclear fuel for use in nuclear reactors is provided in the form of a nuclear fuel element with an interior barrier layer interposed between the sheath and the fuel. The barrier layer incorporates particles of copper in finely divided form to provide by combination with cadmium, which is released during irradiation of the fuel, a stabilized copper-cadmium compound localized intermediate

1982-01-01

413

The evolving nuclear fuel cycle  

Microsoft Academic Search

Various economics and political pressures have shaped the evolution of nuclear fuel cycles over the past 10 to 15 yr. Future trends will no doubt be similarly driven. This paper discusses the influences that long cycles, high discharge burnups, fuel reliability, and costs will have on the future nuclear cycle. Maintaining the economic viability of nuclear generation is a key

J. D. Gale; G. E. Hanson; T. A. Coleman

1993-01-01

414

Scientists debate nuclear source terms  

Microsoft Academic Search

The nuclear source term, defined as the quantity, timing, and characteristic of the release of radioactive material to the environment following a core-melt accident, was thoroughly debated in 1985. This debate, summarized here, turns on the Nuclear Regulatory Commission's (NRC) source term for radioactive iodine, which is postulated as potentially the most life-threatening radionuclide that might escape in a nuclear

2009-01-01

415

Nuclear Technology: Making Informed Decisions.  

ERIC Educational Resources Information Center

Discusses a unit on nuclear technology which is taught in a physics class. Explains the unit design, implementation process, demonstrations used, and topics of discussion that include light and optics, naturally and artificially produced sources of radioactivity, nuclear equations, isotopes and half-lives, and power-generating nuclear reactors.…

Altshuler, Kenneth

1989-01-01

416

Nuclear effects in atomic transitions  

Microsoft Academic Search

Atomic electrons are sensitive to the properties of the nucleus they are bound to, such as nuclear mass, charge distribution, spin, magnetization distribution, or even excited level scheme. These nuclear parameters are reflected in the atomic transition energies. A very precise determination of atomic spectra may thus reveal information about the nucleus, otherwise hardly accessible via nuclear physics experiments. This

Adriana Palffy

2010-01-01

417

Investor perceptions of nuclear power  

Microsoft Academic Search

Evidence is provided that investor concerns about nuclear power have recently been reflected in the common stock returns of all utilities with such facilities and have resulted in a risk premium. In particular, over the 1978-1982 period, three nuclear-related events occurred at the same time as, and therefore appear to have caused, significant drops in the market values of nuclear

Hewlett

1984-01-01

418

Nuclear Matters. A Practical Guide.  

National Technical Information Service (NTIS)

Nuclear Matters: A Practical Guide provides an introduction to the U.S. Nuclear Weapons Program. It is designed for individuals who have a need to understand these matters and is intended to explain the various elements that constitute the Nuclear Weapons...

2008-01-01

419

Windscale Report: a nuclear apologia  

Microsoft Academic Search

Government representatives have pointed repeatedly with pride to Britain's longest nuclear planning inquiry, The Windscale Inquiry, as a model of open examination of a sensitive nuclear proposal. The official Report of the Windscale Inquiry, published in March 1978, bears little relationship to the proceedings of the Inquiry, according to the author. Instead, the Report is a heavy-handed nuclear apologia, he

1978-01-01

420

Nuclear eclectic power.  

PubMed

The uranium and thorium resources, the technology, and the social impacts all seem to presage an even sharper increase in nuclear power for electric generation than had hitherto been predicted. There are more future consequences. The "hydrogen economy." Nuclear power plants operate best at constant power and full load. Thus, a largely nuclear electric economy has the problem of utilizing substantial off-peak capacity; the additional energy generation can typically be half the normal daily demand. Thus, the option of generating hydrogen as a nonpolluting fuel receives two boosts: excess nuclear capacity to produce it, plus much higher future costs for oil and natural gas. However, the so-called "hydrogen economy" must await the excess capacity, which will not occur until the end of the century. Nonelectric uses. By analyses similar to those performed here, raw nuclear heat can be shown to be cheaper than heat from many other fuel sources, especially nonpolluting ones. This will be particularly true as domestic natural gas supplies become more scarce. Nuclear heat becomes attractive for industrial purposes, and even for urban district heating, provided (i) the temperature is high enough (this is no problem for district heating, but could be for industry; the HTGR's and breeders, with 600 degrees C or more available, have the advantage); (ii) there is a market for large quantities (a heat rate of 3800 Mw thermal, the reactor size permitted today, will heat Boston, with some to spare); and (iii) the social costs become more definitely resolved in favor of nuclear power. Capital requirements. Nuclear-electric installations are very capital-intensive. One trillion dollars for the plants, backup industry, and so forth is only 2 percent of the total gross national product (GNP) between 1974 and 2000, at a growth rate of 4 percent per year. But capital accumulation tends to run at about 10 percent of the GNP, so the nuclear requirements make a sizable perturbation. Also increasing the electric share of energy provision means increasing electric power utilization, which has a high technological content and demands yet more capital. Thus, provision of capital is a major problem ahead, especially for electric utilities. The need for people. The supply of available trained technologists, environmental engineers, and so on, especially in the architect-engineer profession, is insufficient for the task ahead, especially since the same categories of people will be in demand to build up a synthetic fuels industry and do other new things. Beyond these specific items and beyond the technological discussion, one can feel deeper currents running in this debate. Issues that started out seeming technological ended up being mainly societal: prevention of clandestine use, either by vigilance or by public spirit; a determination to maintain quality and to safeguard wastes that transcends narrow interests; a perception of social benefits and damage much more holistic than before; the need to manage programs more openly and better than before. Questions and doubts become more acute, answers and methods less sure. Here is a final question. We have never before been given a virtually infinite resource of something we craved. So far, increasingly large amounts of energy have been used to turn resources into junk, from which activity we derive ephemeral benefit and pleasure; the track record is not too good. What will we do now? PMID:17792564

Rose, D J

1974-04-19

421

The ``Nuclear Renaissance'' and the Spread of Nuclear Weapons  

NASA Astrophysics Data System (ADS)

As interest grows around the world in nuclear power as an energy source that could help control greenhouse gas emissions, some have proclaimed the arrival of a ``nuclear renaissance.'' But can the increased risks of more nuclear power be managed? The political crisis surrounding Iran's pursuit of uranium enrichment has exposed weaknesses in the nuclear nonproliferation regime. Also, al Qaeda's declared interest in weapons of mass destruction raises the concern that terrorists could acquire nuclear weapons by stealing materials from poorly secured facilities. Growth of nuclear energy would require the construction of many additional uranium enrichment plants. And the generation of more spent nuclear fuel without a credible waste disposal strategy would increase political support for reprocessing, which separates large quantities of weapon-usable plutonium from spent fuel. There is little evidence that the various institutional arrangements and technical schemes proposed to mitigate the security risks of a major nuclear expansion would be effective. This talk will focus on the measures necessary to allow large-scale global growth of nuclear power without resulting in an unacceptably high risk of nuclear proliferation and nuclear terrorism, and will discuss the feasibility of such measures. To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.OSS07.E1.2

Lyman, Edwin S.

2007-05-01

422

Nuclear chemistry. Annual report, 1974  

SciTech Connect

The 1974 Nuclear Chemistry Annual Report contains information on research in the following areas: nuclear science (nuclear spectroscopy and radioactivity, nuclear reactions and scattering, nuclear theory); chemical and atomic physics (heavy ion-induced atomic reactions, atomic and molecular spectroscopy, photoelectron spectroscopy and hyperfine interactions); physical, inorganic, and analytical chemistry (x-ray crystallography, physical and inorganic chemistry, geochemistry); and instrumentation. Thesis abstracts, 1974 publication titles, and an author index are also included. Papers having a significant amount of information are listed separately by title. (RWR)

Conzett, H.E.; Edelstein, N.M.; Tsang, C.F. (eds.)

1975-07-01

423

Kinetic Model for Signal Binding to the Quorum Sensing Regulator LasR  

PubMed Central

We propose a kinetic model for the activation of the las regulon in the opportunistic pathogen Pseudomonas aeruginosa. The model is based on in vitro data and accounts for the LasR dimerization and consecutive activation by binding of two OdDHL signal molecules. Experimentally, the production of the active LasR quorum-sensing regulator was studied in an Escherichia coli background as a function of signal molecule concentration. The functional activity of the regulator was monitored via a GFP reporter fusion to lasB expressed from the native lasB promoter. The new data shows that the active form of the LasR dimer binds two signal molecules cooperatively and that the timescale for reaching saturation is independent of the signal molecule concentration. This favors a picture where the dimerized regulator is protected against proteases and remains protected as it is activated through binding of two successive signal molecules. In absence of signal molecules, the dimerized regulator can dissociate and degrade through proteolytic turnover of the monomer. This resolves the apparent contradiction between our data and recent reports that the fully protected dimer is able to “degrade” when the induction of LasR ceases.

Claussen, Anetta; Jakobsen, Tim Holm; Bjarnsholt, Thomas; Givskov, Michael; Welch, Martin; Ferkinghoff-Borg, Jesper; Sams, Thomas

2013-01-01

424

[Effect of LAS on physico-chemical properties and microorganism activity in soil environment].  

PubMed

Using a well drained paddy soil and the derived soil under vegetables in the Taihu Lake region, China, experiments of soil capillary rise, colloid dispersion and adsorption of toxic organics and heavy metals by soil under various degrees of LAS addition were conducted. Also incubation experiments of microorganism activity in soil with added LAS in different concentrations were carried out in laboratory. LAS addition resulted in lower capillary rise of soil solution, higher dispersion of soil colloids and lower capacity of soil for organic pollutants but no significant influence on adsorption of heavy metal cations. The nitrification and amonification in soil were very sensitive to LAS stress while denitrification turned to be stimulated. LAS addition gave stronger growth of soil bacteria while decreased growth of fungus. Meanwhile, soil respiration was stimulated in the first week of incubation and compressed afterwards by LAS at concentration over 5 mg/kg. It seemed that some species of microorganisms were tolerant of LAS in the studied soils. PMID:11382044

Pan, G; Han, Y

2001-01-01

425

The La 2S 3-LaS 2 system: Thermodynamic and kinetic study  

NASA Astrophysics Data System (ADS)

A detailed thermodynamic study of the LaS 2-La 2S 3 system in the temperature range 350-1000 °C was performed, starting from high quality crystals LaS 2 as the highest polysulfide in the system, and using a sensitive static tensimetric method with a quartz Bourdon gauge and a membrane as a null-point instrument. The pS- T- x diagram obtained has shown that the phase region covering the composition between LaS 2 and La 2S 3, which was previously described as a single grossly nonstoichiometric phase, consists of three discrete stoichiometric phases, LaS 2.00, LaS 1.91, and LaS 1.76, where compositions could be determined with an accuracy of ±0.01 f.u. The thermodynamic characteristics of evaporation of the polysulfides as well as standard heat of LaS 2 formation were calculated. The role of kinetics in the formation of ordered superstructures of sulfur-poorer polysulfides with different formal concentration of vacancies is considered.

Vasilyeva, I. G.; Nikolaev, R. E.

2010-08-01

426

Correlations in nuclear matter  

NASA Astrophysics Data System (ADS)

We analyze the nuclear matter correlation properties in terms of the pair correlation function. To this aim we systematically compare the results for the variational method in the lowest-order constrained variational (LOCV) approximation and for the Bruekner-Hartree-Fock (BHF) scheme. A formal link between the Jastrow correlation factor of LOCV and the defect function (DF) of BHF is established and it is shown under which conditions and approximations the two approaches are equivalent. From the numerical comparison it turns out that the two correlation functions are quite close, which indicates in particular that the DF is approximately local and momentum independent. The equations of state (EOS) of nuclear matter in the two approaches are also compared. It is found that once the three-body forces (TBF) are introduced, the two EOS are fairly close, while the agreement between the correlation functions holds with or without TBF.

Baldo, M.; Moshfegh, H. R.

2012-08-01

427

The nuclear battery  

NASA Astrophysics Data System (ADS)

The evolution and present status of an Atomic Energy of Canada Limited program to develop a small, solid-state, passively cooled reactor power supply known as the Nuclear Battery is reviewed. Key technical features of the Nuclear Battery reactor core include a heat-pipe primary heat transport system, graphite neutron moderator, low-enriched uranium TRISO coated-particle fuel and the use of burnable poisons for long-term reactivity control. An external secondary heat transport system extracts useful heat energy, which may be converted into electricity in an organic Rankine cycle engine or used to produce high-pressure steam. The present reference design is capable of producing about 2400 kW(t) (about 600 kW(e) net) for 15 full-power years. Technical and safety features are described along with recent progress in component hardware development programs and market assessment work.

Kozier, K. S.; Rosinger, H. E.

428

Topics in Nuclear Power  

NASA Astrophysics Data System (ADS)

The 104 nuclear plants operating in the US today are far safer than they were 20-30 years ago. For example, there's been about a 100-fold reduction in the occurrence of ``significant events'' since the late 1970s. Although the youngest of currently operating US plants was designed in the 1970s, all have been significantly modified over the years. Key contributors to the safety gains are a vigilant culture, much improved equipment reliability, greatly improved training of operators and maintenance workers, worldwide sharing of experience, and the effective use of probabilistic risk assessment. Several manufacturers have submitted high quality new designs for large reactors to the U.S. Nuclear Regulatory Commission (NRC) for design approval, and some designers are taking a second look at the economies of smaller, modular reactors.

Budnitz, Robert J.

2011-11-01

429

Nuclear energy in space  

NASA Astrophysics Data System (ADS)

The electric onboard power requirements of spacecraft have steadily increased since the launching of the first spacecraft, and power requirements of Earth satellites as high as 10 kW are currently observed. Since the early 1960s, nuclear power installations in space have been used by the U.S. and the Soviet Union in connection with electric power requirements which cannot be satisfied by solar cells. Such requirements are related to flights to the outer planets and the operation of spacecraft in the lunar or planetary shadow (including the shadow of the Earth). Possibilities for the use of nuclear energy in space are discussed, and the employment of radioisotope batteries is considered.

Loeb, H.

1983-04-01

430

Nuclear electric propulsion  

NASA Technical Reports Server (NTRS)

The feasibility is investigated of using nuclear electric propulsion (NEP) for slow freighter ships traveling from a 500 km low Earth orbit (LEO) to the Moon's orbit about the Earth, and on to Mars. NEP is also shown to be feasible for transporting people to Mars on long conjunction-class missions lasting about nine months one way, and on short sprint missions lasting four months one way. Generally, it was not attempted to optimize ion exhaust velocities, but rather suitable parameters to demonstrate NEP feasibility were chosen. Various combinations of missions are compared with chemical and nuclear thermal propulsion (NTR) systems. Typically, NEP and NTR can accomplish the same lifting task with similar mass in LEO. When compared to chemical propulsion, NEP was found to accomplish the same missions with 40% less mass in LEO. These findings are sufficiently encouraging as to merit further studies with optimum systems.

Keaton, Paul W.; Tubb, David J.

1986-01-01

431

Nuclear electric propulsion  

NASA Astrophysics Data System (ADS)

The feasibility is investigated of using nuclear electric propulsion (NEP) for slow freighter ships traveling from a 500 km low Earth orbit (LEO) to the Moon's orbit about the Earth, and on to Mars. NEP is also shown to be feasible for transporting people to Mars on long conjunction-class missions lasting about nine months one way, and on short sprint missions lasting four months one way. Generally, it was not attempted to optimize ion exhaust velocities, but rather suitable parameters to demonstrate NEP feasibility were chosen. Various combinations of missions are compared with chemical and nuclear thermal propulsion (NTR) systems. Typically, NEP and NTR can accomplish the same lifting task with similar mass in LEO. When compared to chemical propulsion, NEP was found to accomplish the same missions with 40% less mass in LEO. These findings are sufficiently encouraging as to merit further studies with optimum systems.

Keaton, Paul W.; Tubb, David J.

1986-05-01

432

Teaching Activities on Horizontal Nuclear Proliferation.  

ERIC Educational Resources Information Center

Provides learning activities concerning the horizontal proliferation of nuclear weapons. Includes step-by-step directions for four activities: (1) the life cycle of nuclear weapons; (2) nuclear nonproliferation: pros and cons; (3) the nuclear power/nuclear weapons connection; and (4) managing nuclear proliferation. (NL)

Zola, John

1990-01-01

433

Pediatric nuclear medicine  

SciTech Connect

This book discusses the diagnostic techniques of nuclear medicine as applied in pediatric patients. Particular emphasis is placed on the subject of scintigraphy of organ systems for diagnostic purposes. The topics covered are: scintigraphy of skeleton, bone marrow spleen, liver, thyroid, lungs, urinary tract, brain, heart and cerebrospinal fluid. The pathology and scintigraphy of lacrimal glands is also covered. Other diagnostic techniques of radiology in pediatrics are also briefly discussed for comparative evaluation.

Treves, S.T.

1985-01-01

434

Underground nuclear waste containments  

Microsoft Academic Search

In the United States, about a hundred million gallons of high-level nuclear waste are stored in underground containments. Basically, these containments are of two different designs: single-shell and double-shell structures. The single-shell structures consist of reinforced concrete cylindrical walls seated on circular mats and enclosed on top with torispherical domes or circular flat roofs. The walls and the basemats are

Bandyopadhyay

1995-01-01

435

Nuclear criticality accidents.  

PubMed

Criticality occurs when a sufficient quantity of fissionable material is accumulated, and it results in the liberation of nuclear energy. All process accidents have involved plutonium or highly enriched uranium, as have most of the critical experiment accidents. Slightly enriched uranium systems require much larger quantities of material to achieve criticality. An appreciation of criticality accidents should be based on an understanding of factors that influence criticality, which are discussed in this article. PMID:1962246

Smith, D R

1991-01-01

436

Cold nuclear fusion  

NASA Astrophysics Data System (ADS)

Recent accelerator experiments on fusion of various elements have clearly demonstrated that the effective cross-sections of these reactions depend on what material the target particle is placed in. In these experiments, there was a significant increase in the probability of interaction when target nuclei are imbedded in a conducting crystal or are a part of it. These experiments open a new perspective on the problem of so-called cold nuclear fusion.

Tsyganov, E. N.

2012-02-01

437

Cold nuclear fusion  

Microsoft Academic Search

The possibility that negative muons could catalyze nuclear fusion was suggested on theoretical grounds by F.C. Frank and A.D. Sakharov in the late 1940s; the first experimental observations of the process followed serendipitously a decade later, in experiments at Berkeley by L.W. Alvarez. The fastest mechanism for muon-catalyzed, or 'cold' fusion, was suggested by Vesman (1967); it depends on a

Johann Rafelski; Steven E. Jones

1987-01-01

438

Laser induced nuclear reactions  

Microsoft Academic Search

Dramatic improvements in laser technology since 1984 have revolutionised high power laser technology. Application of chirped-pulse amplification techniques has resulted in laser intensities in excess of 1019 W\\/cm2. In the mid to late eighties, C. K. Rhodes and K. Boyer discussed the possibility of shining laser light of this intensity onto solid surfaces and to cause nuclear transitions. In particular,

Ken Ledingham; Tom McCanny; Paul Graham; Xiao Fang; Ravi Singhal; Joe Magill; Alan Creswell; David Sanderson; Ric Allott; David Neely; Peter Norreys; Marko Santala; Matthew Zepf; Ian Watts; Eugene Clark; Karl Krushelnick; Michael Tatarakis; Bucker Dangor; Antonin Machecek; Justin Wark

1998-01-01

439

Nuclear Energy Economical Viability  

Microsoft Academic Search

Recent construction technique developments and technology evolution have made the nuclear option a cost competitive option\\u000a with other load base technologies such as coal and combined cycle facilities based on natural gas. Construction period, from\\u000a first concrete to commercial operation, is around five years, as it has been confirmed by the most recent reactors built in\\u000a Asia (e.g. Japan and

Gustavo Alonso; Jose R. Ramirez; Javier C. Palacios

440

Nuclear fuel cycle costs  

Microsoft Academic Search

The costs for the back-end of the nuclear fuel cycle, which were developed as part of the Nonproliferation Alternative Systems Assessment Program (NASAP), are presented. Total fuel cycle costs are given for the pressurized water reactor once-through and fuel recycle systems, and for the liquid-metal fast breeder reactor system. These calculations show that fuel cycle costs are a small part

W. D. Burch; M. J. Haire; R. H. Rainey

1982-01-01

441

Post detonation nuclear forensics  

NASA Astrophysics Data System (ADS)

The problem of working backwards from the debris of a nuclear explosion to attempt to attribute the event to a particular actor is singularly difficult technically. However, moving from physical information of any certainty through the political steps that would lead to national action presents daunting policy questions as well. This monograph will outline the operational and physical components of this problem and suggest the difficulty of the policy questions that remain.

Davis, Jay

2014-05-01

442

(Supercomputing in nuclear applications)  

SciTech Connect

The traveler attended the first international conference on supercomputing in nuclear applications. The traveler presented a paper on parallel processing of the nodal diffusion method. The traveler visited JAERI, NEDAC, Hitachi Works, CRC and CTCC. At JAERI and NEDAC, the traveler made a presentation on RSIC activities. The traveler then proceeded to the Philippines where she visited PNRI, made an RSIC orientation visit and presented the SNA 90 paper and had several discussions with PNRI staff.

Kirk, B.L.

1990-04-09

443

Nuclear fuel assembly spacer  

SciTech Connect

A spacer for use in a fuel assembly of a nuclear reactor having thin, full-height divider members, slender spring members and laterally oriented rigid stops and wherein the total amount of spacer material, the amount of high neutron cross section material, the projected area of the spacer structure and changes in cross section area of the spacer structure are minimized whereby neutron absorption by the spacer and coolant flow resistance through the spacer are minimized.

Curulla, M. V.; Brayman, K. W.; Matzner, B.; Price, T. F.; Qurnell, F. D.

1985-10-01

444

Nuclear reactor safety system  

Microsoft Academic Search

A safety system (10) for shutting down a nuclear reactor under overload conditions is provided using a series of parallelconnected computing modules (14a, 14b, 14c, 14d, 14e) each of which receives data on a particular reactor parameter (P, t, phi t, phi b, w) and each of which produces a function (F(P), f(T), f( Phi t), f( Phi b), f(W))

Ball

1981-01-01

445

Nuclear reactor safety system  

Microsoft Academic Search

A safety system for shutting down a nuclear reactor under overload conditions is provided using a series of parallelconnected computer memory type look-up tables each of which receives data on a particular reactor parameter (P, t, phi t, phi b, w) and each of which has stored therein a precalculated functional value (F(P); f(T); f( Phi t); f( Phi b);

R. M. Ball; R. C. Roberts

1981-01-01

446

Polarized nuclear targets  

SciTech Connect

The static and dynamic methods for producing polarized targets are briefly discussed and compared. Nuclei that have been polarized by these methods are summarized. The equipment necessary for producing a working target is described, as are the capabilities presently available at LAMPF. A short description is presented of a polarized /sup 13/C target proposed for use at the LAMPF HRS spectrometer, as an example of a polarized target for use in nuclear physics research.

Jarmer, J.J.

1986-01-01

447

US nuclear forces, 2011  

Microsoft Academic Search

The Obama administration’s disclosure of its stockpiled and dismantled warhead numbers through September 2009 was, apparently, a “one-time release”; thus, the question remains as to how quickly—or slowly—the country’s arsenal will decline. Turning to the Nuclear Posture Review and New START, the authors assess what can be expected in terms of force levels and counting rules, and they provide clear

Hans M. Kristensen; Robert S. Norris

2011-01-01

448

El fenotipo de las mucinas en el es?fago de Barrett  

PubMed Central

Antecedentes El esófago de Barrett es una reconocida lesión precursora de adenocarcinoma esofágico. Aunque generalmente asociada al reflujo gastroesofágico, los mecanismos patogénicos de la enfermedad no son bien conocidos. El objetivo del presente estudio es explorar la historia natural e identificar marcadores de progreso del proceso precanceroso. Material y métodos Se utilizaron cortes histológicos de 67 especímenes de esófago correspondientes a 14 pacientes con esófago de Barrett, a los que se siguió entre 1 – 9 años. Se clasificaron las lesiones en: esófago de Barrett sin displasia, indefinido para displasia o con displasia. Se evaluó la expresión de diferentes mucinas en las células caliciformes y en las columnares usando técnicas de histoquímica e inmunohistoquímica. Resultados En todos los casos se comprobó la presencia de metaplasia intestinal incompleta. Las células columnares dentro del epitelio metaplásico contenían mucinas neutras. A mayor severidad de la lesión se encontró significativamente menor expresión de sialomucinas en las células columnares (p de tendencia igual a 0,03). En sujetos con lesiones indefinidas para displasia se observó un mayor contenido de sulfomucinas en las células caliciformes (p=0,034) y de MUC2 en las células columnares (p=0,029) que en sujetos con esófago de Barrett sin displasia. Se observó expresión de la mucina intestinal MUC2 y de la mucina gástrica MUC5AC en todas las muestras. MUC6, una mucina de las glándulas profundas gástricas, se presentó ocasionalmente. Conclusión La evaluación de los perfiles de mucinas en el esófago de Barrett sugiere una transición gradual del fenotipo del epitelio metaplásico a medida que la lesión avanza en el tiempo.

Torrado, Julio; Piazuelo, Maria Blanca; Ruiz, Irune; Izarzugaza, Maria Isabel; Camargo, Maria Constanza; Delgado, Alberto; Abdirad, Afshin; Correa, Pelayo

2011-01-01

449

Nuclear War. The moral dimension  

SciTech Connect

U.S. nuclear policy has become the target of increasing criticism during the past decade. Critics often argue that the use of nuclear weapons would be irrational, would destroy humankind, and thus could not serve any rational policy goal. Other critics point to the immortality of the use of nuclear weapons. Both groups condemn U.S. military policy. In Nuclear War, James Child considers and rejects both these lines of criticism. He argues that a policy of deterrence can be both rational and moral; that U.S. nuclear policy is, on balance, based on rational and moral foundations. Child examines near-term consequences of a nuclear war and finds them ghastly but not unthinkable or incomparable to the havoc produced by previous wars. He also analyzes long-term consequences, such as those proposed by the ''nuclear winter'' theory, and finds the fear of total annihilation of humankind to be unfounded.

Child, J.W.

1985-01-01

450

Nuclear Polarization of Nanodiamond  

NASA Astrophysics Data System (ADS)

Nanoparticles with long nuclear spin relaxation times are candidates for use in the context of targeted therapeutic delivery [1] and magnetic resonance imaging [1,2]. We report progress towards the development of contrast agents [3] based on 13C in nanodiamond. Nuclear relaxation and electron spin resonance data is presented for particles produced using detonation and the high-pressure high temperature technique. We describe the development of a milli-Kelvin nuclear polarization setup that makes use of a dilution refrigerator and X-band microwave resonator with fast sample exchange. [1] Huang H., Pierstorff E., Osawa E., Ho D., ``Active Nanodiamond Hydrogels for Chemotherapeutic Delivery'', Nano Lett, 7, 3305-3314 (2007). [2] Aptekar J.W., Cassidy M. C., Johnson A. C., Barton R. A., Lee M. Y., Ogier A. C., Vo C., Anahtar M. N., Ren Y., Bhatia S. N., Ramanathan C., Cory D. G., Hill A. L., Mair R. W., Rosen M. S., Walsworth R. L., Marcus C. M., ``Silicon nanoparticles as hyperpolarized magnetic resonance imaging agents'', ACS Nano, 3, 4003-4008 (2009). [3] Manus L. M., Mastarone D. J., Waters E. A., Zhang X., Schultz-Sikma E. A., MacRenaris K. W., Ho D., Meade T. J., ``Gd(III)-nanodiamond conjugates for MRI contrast enhancement'', Nano Lett, 10, 484-489 (2010).

Rej, Ewa; Reilly, David

2012-02-01

451

Prevention of nuclear war  

SciTech Connect

Physicians are exercising their responsibility as healers in their efforts to prevent nuclear war. Death for Hiroshima survivors was experienced in four stages: the immediate impact of destruction, the acute impact of radiation, delayed radiation effects, and later identification as an atomic bomb survivor. Each phase had its physical and psychological impacts and negates Hiroshima as a model for rational behavior despite those who claim survival is possible for those who are prepared. The psychic effects of modern nuclear, chemical, and germ warfare need to be challenged with a symbolization of life and immortality. Studies of psychological reactions to the terror children felt during practice air-raid drills indicate that the fears can be surpressed and re-emerge in adult life as a linking of death with collective annihilation. Other themes which emerge are feelings of impermanence, craziness, identification with the bomb, and a double existence. Psychic numbing and the religion of nuclearism cause dangerous conflicts with the anxieties caused by increasing awareness of death. (DCK)

Lifton, R.J.

1980-10-01

452

Nuclear and particle astrophysics  

SciTech Connect

We discuss the physics of matter that is relevant to the structure of compact stars. This includes nuclear, neutron star matter and quark matter and phase transitions between them. Many aspects of neutron star structure and its dependance on a number of physical assumptions about nuclear matter properties and hyperon couplings are investigated. We also discuss the prospects for obtaining constraints on the equation of state from astrophysical sources. Neuron star masses although few are known at present, provide a very direct constraint in as much as the connection to the equation of state involves only the assumption that Einstein's general of theory of relativity is correct at the macroscopic scale. Supernovae simulations involve such a plethora of physical processes including those involved in the evolution of the precollapse configuration, not all of them known or understood, that they provide no constraint at the present time. Indeed the prompt explosion, from which a constraint had been thought to follow, is now believed not to be mechanism by which most, if any stars, explode. In any case the nuclear equation of state is but one of a multitude on uncertain factors, and possibly one of the least important. The rapid rotation of pulsars is also discussed. It is shown that for periods below a certain limit it becomes increasingly difficult to reconcile them with neutron stars. Strange stars are possible if strange matter is the absolute ground state. We discuss such stars and their compatibility with observation. 112 refs., 37 figs., 6 tabs.

Glendenning, N.K.

1990-10-31

453

Suspected Chinese Nuclear Espionage  

NSDL National Science Digital Library

This week's In the News examines serious allegations of security breaches at the US nuclear weapons laboratory in Los Alamos, New Mexico and the possible transfer of secret data to China. In what is quickly devolving into a worst case scenario, it now appears that China has secured thousands of lines of invaluable computer code from the top-level nuclear weapons lab at the Los Alamos, New Mexico. The codes were allegedly transferred by scientist Wen Ho Lee from a secure system to an unclassified computer network at the lab in 1994 and 1995, where they were apparently accessed by someone who improperly used a password. The theft of these codes, in the opinion of some officials, compromises "virtually every nuclear weapon in the United States arsenal." Domestic politics have further clouded the situation, as many critics of the Clinton administration claim that earlier reports of possible security breaches were ignored by a government focused on normalizing US-China relations and promoting trade ties. The House Select Committee on US National Security and Military/ Commercial Concerns with the People's Republic of China, chaired by Representative Christopher Cox (R-CA), completed an extensive report on the transfer of military technology in December 1998. However, the administration has delayed security clearance, attempting to keep large portions of the report classified. A sanitized version, along with a separate report by the Senate Intelligence Committee, are expected to be released in mid-May.

De Nie, Michael W.

1999-01-01

454

Nuclear Tests in India  

NSDL National Science Digital Library

This Week's In the News discusses the recent nuclear tests in India and the world's reaction to those tests. The ten resources discussed offer analysis, commentary, and background information from a variety of perspectives. On May 11, 1998, India confirmed what the world already knew by conducting three underground nuclear tests in the Pokhran Mountain Range in the Rajasthan Province. On May 13 two more sub-kiloton devices were exploded and the government announced that the planned series of tests was complete. Although India has indicated it may now be ready to sign on to the Comprehensive Test Ban Treaty (CTBT), reaction from the world community has been extremely negative. In the vanguard of this chorus of dissaproval has been the US, which announced over $20 billion in economic sanctions against India on May 13. The strongest critic of the tests, however, has been India's neighbor and rival Pakistan, which has fought three wars with India since 1947. Domestic pressure on Pakistani Prime Minister Nawaz Sharif to respond has been enormous and many commentators believe a Pakistani nuclear test is imminent. In India, however, the BJP-dominated government has been widely lauded. Many Indians have expressed pride and dismiss foreign criticism as a hypocritical holdover of colonial mentalities. While US sanctions are unlikely to have any large-scale effect on India, the end results of these tests on Indo-Pakistani relations and their ongoing missile race is yet to be seen.

De Nie, Michael W.

1998-01-01

455

Synopsis of nuclear medicine.  

PubMed

The application of radionuclides to medical diagnosis and treatment has a relatively short history. The phenomenon of radioactivity was originally discovered by Henri Bacquerel in 1896, whereas Pierre and Marie Curie isolated the naturally occurring element radium in 1899. The use of radium in the treatment of malignant disease was first introduced at the turn of this century, and was established by 1920. It was not until 1938, however, that the discovery of nuclear fission made possible the subsequent development of the nuclear reactor, and the large-scale production of artificial radioactive nuclides. It was immediately realised that the latter opened up great possibilities in the medical field. The radioactive isotope was chemically indistinguishable from the stable isotopes of the element, and minute quantities of it in the body could be detected externally by virtue of the radiation they emitted; it could be used as a "tracer" to follow the metabolism of a substance throughout the body. The following synopsis is a brief attempt to introduce the Kenyan medical personnel into the scope of nuclear energy in medicine. PMID:2612403

Waweru, F N; Othieno, J O

1989-10-01

456

Nuclear Physics Underground  

SciTech Connect

Precisely known nuclear cross sections are an essential ingredient for the modeling of nuclear processes in our Sun, in stars, and in the Big Bang. Uncertainties due to theoretical extrapolations can be avoided if experimental data are available directly at astrophysically relevant energies. Since such energies are typically far below the Coulomb barrier, this entails cross section measurements in the picobarn range.The Laboratory for Underground Nuclear Astrophysics (LUNA) inside the Gran Sasso mountain in Italy takes up this challenge by combining accelerator-based experiments with low-background measurement techniques. Using this approach, in recent years several reactions relevant to hydrogen burning have been studied, e.g. {sup 3}He({alpha},{gamma}){sup 7}Be and {sup 14}N(p,{gamma}){sup 15}O. The implications of the data range from an independent lower limit on the age of the universe to a precise solar thermometer.Based on this progress, currently there are efforts in several countries to construct new underground accelerators. The exciting science that can be probed with these new facilities will be highlighted.

Bemmerer, Daniel

2010-08-04

457

Nuclear Technology Programs  

SciTech Connect

This document reports on the work done by the Nuclear Technology Programs of the Chemical Technology Division, Argonne National Laboratory, in the period April--September 1988. These programs involve R D in three areas: applied physical chemistry, separation science and technology, and nuclear waste management. The work in applied physical chemistry includes investigations into the processes that control the release and transport of fission products under accident-like conditions, the thermophysical properties of selected materials in environments simulating those of fusion energy systems. In the area of separation science and technology, the bulk of the effort is concerned with developing and implementing processes for the removal and concentration of actinides from waste streams contaminated by transuranic elements. Another effort is concerned with examining the feasibility of substituting low-enriched for high-enriched uranium in the production of fission-product {sup 99}Mo. In the area of waste management, investigations are underway on the performance of materials in projected nuclear repository conditions to provide input to the licensing of the nation's high-level waste repositories.

Harmon, J.E. (ed.)

1990-10-01

458

Progress in Nuclear Detection  

NASA Astrophysics Data System (ADS)

The Transformational and Applied Research Directorate (TAR) was established within the Department of Homeland Security's Domestic Nuclear Detection Office (DNDO) to conduct, support, coordinate, and encourage near- and long-term Research and Development (R&D) programs for break-through technologies designed to dramatically improve capabilities to detect and report illicit trafficking of nuclear and radiological materials. These programs cover a wide range of technologies and high-level technical challenges associated with the DNDO mission and the Global Nuclear Detection Architecture (GNDA). They encompass a range of technology levels, ranging from feasibility and proof of concept studies to technology demonstrations of systems. Even though the focus is on high level challenges, the direction of some topic areas can change from year to year. This presentation will provide an overview of the TAR mission and discuss the current status of transformational R&D efforts in three major program areas: Advanced Technology Demonstrations (ATD), Exploratory Research (ER) and Academic Research Initiative (ARI). )

Vojtech, Richard

2010-02-01

459

Inner/Outer Nuclear Membrane Fusion in Nuclear Pore Assembly  

PubMed Central

Nuclear pore complexes (NPCs) are large proteinaceous channels embedded in double nuclear membranes, which carry out nucleocytoplasmic exchange. The mechanism of nuclear pore assembly involves a unique challenge, as it requires creation of a long-lived membrane-lined channel connecting the inner and outer nuclear membranes. This stabilized membrane channel has little evolutionary precedent. Here we mapped inner/outer nuclear membrane fusion in NPC assembly biochemically by using novel assembly intermediates and membrane fusion inhibitors. Incubation of a Xenopus in vitro nuclear assembly system at 14°C revealed an early pore intermediate where nucleoporin subunits POM121 and the Nup107-160 complex were organized in a punctate pattern on the inner nuclear membrane. With time, this intermediate progressed to diffusion channel formation and finally to complete nuclear pore assembly. Correct channel formation was blocked by the hemifusion inhibitor lysophosphatidylcholine (LPC), but not if a complementary-shaped lipid, oleic acid (OA), was simultaneously added, as determined with a novel fluorescent dextran-quenching assay. Importantly, recruitment of the bulk of FG nucleoporins, characteristic of mature nuclear pores, was not observed before diffusion channel formation and was prevented by LPC or OA, but not by LPC+OA. These results map the crucial inner/outer nuclear membrane fusion event of NPC assembly downstream of POM121/Nup107-160 complex interaction and upstream or at the time of FG nucleoporin recruitment.

Fichtman, Boris; Ramos, Corinne; Rasala, Beth; Harel, Amnon

2010-01-01

460

Nuclear data needs for application in nuclear criticality safety programs  

SciTech Connect

In nuclear criticality safety applications, a number of important uncertainties have to be addressed to establish the required criticality safety margin of a nuclear system. One source of these uncertainties is the basic nuclear data used to calculate the effective multiplication factor of the system. Before criticality safety calculations are performed, the bias and uncertainties of the codes and cross sections that are used must be determined. Cross-section data are measured, evaluated, and tested prior to their inclusion in nuclear data libraries. Traditionally, nuclear data evaluations are performed to support the analysis and design of thermal and fast reactors. The neutron spectra characteristic of the thermal and fast systems used for data testing are predominantly in the low- and high-energy ranges, with a relatively minor influence from the intermediate-energy range. In the area of nuclear criticality safety, nuclear systems involving spent fuel elements from reactors can lead to situations very different from those most commonly found in reactor analysis and design. These systems are not limited to thermal or fast neutron spectra and may have their most significant influence from the intermediate energy range. This requires extending the range of applicability of the nuclear data evaluation beyond thermal and fast systems. The aim here is to focus on the evaluated nuclear data pertaining to applications in nuclear criticality safety.

Leal, L.C.; Westfall, R.M.; Jordan, W.C.; Wright, R.Q. [Oak Ridge National Lab., TN (United States). Computational Physics and Engineering Div.

1995-09-01

461

Language Assessment Scales, Level 2, LAS II, for Grades 6 and Up, English/Spanish. Examiner's Manual.  

ERIC Educational Resources Information Center

Language Assessment Scales, Level 2 (LAS II) are used to assess the linguistic proficiency of limited-English-speaking or non-English-speaking adolescents. LAS II, like its predecessor, LAS I, provides a picture of oral linguistic proficiency based on a student's performance across four linguistic subsystems: phonemic, lexical, syntactic and…

Duncan, Sharon E.; De Avila, Edward A.

462

El efecto de las prácticas de gobierno corporativo sobre la valuación de mercado y políticas de pago de compañías chilenas  

Microsoft Academic Search

(Disponible en idioma inglés únicamente) En este trabajo nos preguntamos si las prácticas de conducción empresarial al nivel de compañía en un país dado inciden o no en la valuación de mercado de esas compañías. Esta cuestión es esencial para poder evaluar los beneficios potenciales que puede reportar a las empresas un cambio de sus prácticas, aún cuando las mismas

Fernando Lefort; Eduardo Walker

2005-01-01

463

La incidencia de las transferencias del gobierno en la distribucion de la renta en Estados Unidos: 1981-2000  

Microsoft Academic Search

El trabajo trata de evaluar la influencia redistributiva que han ejercido las transferencias públicas realizadas bajo las cinco administraciones que han gobernado en EE.UU. en el periodo 1980-2000. Tras repasar la literatura reciente sobre el tema, se definen dos conceptos de Renta Doméstica que permiten distinguir entre los Ingresos Propios y las transferencias aportadas por el gobierno. A continuación, se

E. Palazuelos

2004-01-01

464

Aircraft Accident Report - Las Vegas Airlines Flight 88, Piper PA-31-350, Grand Canyon, Arizona, August 17, 1983.  

National Technical Information Service (NTIS)

On August 17, 1983, Las Vegas Airlines Flight 88, a Piper PA-31-350, N88LV, was being operated as a scheduled Grand Canyon sightseeing flight from Las Vegas, Nevada, to Tusayan, Arizona. Weather conditions precluded the pilot of Las Vegas 88 from flying o...

1984-01-01

465

A role for nuclear lamins in nuclear envelope assembly  

Microsoft Academic Search

he molecular interactions responsible for nuclear en- velope assembly after mitosis are not well under- stood. In this study, we demonstrate that a peptide consisting of the COOH-terminal domain of Xenopus lamin B3 (LB3T) prevents nuclear envelope assembly in Xe- nopus interphase extracts. Specifically, LB3T inhibits chro- matin decondensation and blocks the formation of both the nuclear lamina-pore complex and

Reynold I. Lopez-Soler; Robert D. Moir; Timothy P. Spann; Reimer Stick; Robert D. Goldman

2001-01-01

466

Routine Diagnostic Venous Ultrasound and LAS for Leg Edema of Unknown Cause  

PubMed Central

Objective: To verify the diagnostic efficiency of venous duplex ultrasound and lymphangioscintigraphy (LAS) in establishing the cause of leg edema and to clarify the pathology of these leg edemas. Materials and Methods: Between April 2009, and March 2010, 62 patients with leg edema of unknown origin were referred to the Edema Clinic of the Yamaguchi University Graduate School of Medicine. All patients underwent a venous duplex ultrasound scan and LAS. Results: Of 62 patients, lymphatic insufficiency, venous insufficiency or both was diagnosed in 42 (68%), and lymphedema, in 29 (47%). Venous duplex ultrasound detected obvious venous disorders in only 13 (21%), and for 20 patients, the ultrasound and LAS did not reveal any abnormalities; however, for 15 of the 20 (24% of all patients), venous edema was attributed to functional causes. Conclusion: Venous duplex ultrasound and LAS assisted in the diagnosis of leg edema of unknown origin and also proved useful in establishing treatment strategies.

2010-01-01

467

Terrestrial risk assessment for linear alkyl benzene sulfonate (LAS) in sludge-amended soils.  

PubMed

A comparison of the estimated environmental concentration and the effect concentrations (in the laboratory or field) in the receiving compartment form the basis of environmental risk assessments. This paper reviews processes that critically influence the fate of LAS in the terrestrial environment. Concentrations of LAS in sludge are quite high due to sorption to primary sludge, precipitation of Ca and Mg-salts of LAS, and lack of biodegradation under anaerobic digestion. This implies that when sludge is applied to soil e.g. as a fertilizer, considerable amounts of this important surfactant may enter the terrestrial environment. Influence of aerobic situations on LAS concentrations during sludge storage needs further research to allow incorporation into the risk assessment. Aerobic biodegradation in soil is considered the most important removal mechanism of LAS loading to the terrestrial environment through sludge-amendment. Sorption plays a role in determining the residence time of a chemical in the soil, hereby enabling more time for biodegradation to occur. In addition, sorption may affect the expression of effects of surfactants towards benthic and soil dwelling organisms and plants. Another factor that needs further attention is the form of LAS in the environment, which is not similar to the commercial material applied in detergents. The differential sorption and biodegradation of the LAS components lead to a shift in the alkyl chain length (homologue), and phenylisomer distribution towards increased hydrophobicity. Also, occurrence of Ca/Mg-salts in the environment versus the Na-salt for the commercial material critically impacts the extrapolation of effects data obtained in lab studies (mostly performed with the commercial material) to the field. The literature data were used in combination with strategies and methods provided by the European Union Technical Guidance Document in support of risk assessment of new and notified substances (1996) for the prediction of environmental concentrations of LAS entering the soil system through sludge applications. Soil biodegradation is an essential, necessary element for the PEC-calculations of LAS. The initial realistic worst case assessment presented indicates no human health risks exists with indirect exposure to LAS through either food or drinking water. Also, current LAS use does not pose a risk to terrestrial organisms such as plants and invertebrates. PMID:9493328

de Wolf, W; Feijtel, T

1998-03-01

468

Nuclear obligations: Nuremberg law, nuclear weapons, and protest  

SciTech Connect

Nuclear weapons use and deployment and nonviolent anti-nuclear protests are evaluated. Use of nuclear weapons would constitute war crimes and crimes against humanity as defined in both the Nuremberg Charter and Allied Control Council Law No. 10 and applied by the International Military Tribunal and other Nuremberg courts. Strategic and atomic bombing during World War 2 did not set a precedent for use of nuclear weapons. The consequentialist argument for World War 2 bombing fails and the bombing has also been repudiated by codification of the law of war in Protocol 1 to the 1949 Geneva Conventions. The legality of deploying nuclear weapons as instruments of geopolitical policy is questionable when measured against the Nuremberg proscription of planning and preparation of aggressive war, war crimes, and crimes against humanity and the United Nations Charter's proscription of aggressive threat of force. While states' practice of deploying the weapons and the arms-control treaties that regulate but do not prohibit mere possession provide some support for legality, those treaties recognize the imperative of preventing nuclear war, and the Nuclear Non-Proliferation Treaty commits nuclear-armed states to good-faith negotiation of nuclear disarmament.

Burroughs, J.R.

1991-01-01

469

Fresh nuclear fuel measurements at Ukrainian nuclear power plants  

SciTech Connect

In 2005, the Provisions on Nuclear Material Measurement System was enacted in Ukraine as an important regulatory driver to support international obligations in nuclear safeguards and nonproliferation. It defines key provisions and requirements for material measurement and measurement control programs to ensure the quality and reliability of measurement data within the framework of the State MC&A System. Implementing the Provisions requires establishing a number of measurement techniques for both fresh and spent nuclear fuel for various types of Ukrainian reactors. Our first efforts focused on measurements of fresh nuclear fuel from a WWR-1000 power reactor.

Kuzminski, Jozef [Los Alamos National Laboratory; Ewing, Tom [ANL; Dickman, Debbie [PNNL; Gavrilyuk, Victor [UKRAINE; Drapey, Sergey [UKRAINE; Kirischuk, Vladimir [UKRAINE; Strilchuk, Nikolay [UKRAINE

2009-01-01

470

Benitez Rojo and Las Casas's Plague of Ants: The Libidinal Versus the Ideological Unconscious  

Microsoft Academic Search

In a recent work, La isla que se repite, Cuban critic Antonio Benítez Rojo rereads one of the digressive “fictions” within Las Casas’s Historia de las Indias, concerning a plague of ants that occurred in the Caribbean islands in 1519–21, and, through the deployment of the key Freudian notion of the uncanny, argues that it rehearses the Spaniard’s deeply entrenched

2002-01-01

471

Neutrons and Nuclear Engineering  

SciTech Connect

Oak Ridge National Laboratory hosted two workshops in April 2007 relevant to nuclear engineering education. In the Neutron Stress, Texture, and Phase Transformation for Industry workshop [http://neutrons.ornl.gov/workshops/nst2/], several invited speakers gave examples of neutron stress mapping for nuclear engineering applications. These included John Root of National Research Council of Canada, Mike Fitzpatrick of the UK's Open University, and Yan Gao of GE Global Research on their experiences with industrial and academic uses of neutron diffraction. Xun-Li Wang and Camden Hubbard described the new instruments at ORNL that can be used for such studies. This was preceded by the Neutrons for Materials Science and Engineering educational symposium [http://neutrons.ornl.gov/workshops/edsym2007]. It was directed to the broad materials science and engineering community based in universities, industry and laboratories who wish to learn what the neutron sources in the US can provide for enhancing the understanding of materials behavior, processing and joining. Of particular interest was the presentation of Donald Brown of Los Alamos about using 'Neutron diffraction measurements of strain and texture to study mechanical behavior of structural materials.' At both workshops, the ORNL neutron scattering instruments relevant to nuclear engineering studies were described. The Neutron Residual Stress Mapping Facility (NRSF2) is currently in operation at the High Flux Isotope Reactor; the VULCAN Engineering Materials Diffractometer will begin commissioning in 2008 at the Spallation Neutron Source. For characteristics of these instruments, as well as details of other workshops, meetings, capabilities, and research proposal submissions, please visit http://neutrons.ornl.gov. To submit user proposals for time on NRSF2 contact Hubbard at hubbardcr@ornl.gov.

Ekkebus, Allen E [ORNL

2007-01-01

472

Nuclear physics and astrophysics  

SciTech Connect

We have investigated a variety of research topics on the interface of nuclear physics and astrophysics during the past year. We have continued our study of dihyperon states in dense matter and have started to make a connection between their properties in the core of neutron stars with the ongoing experimental searches at Brookhaven National Laboratory. We started to build a scenario for the origin of gamma-ray bursts using the conversion of neutron stars to strange stars close to an active galactic nucleous. We have been reconsidering the constraints due to neutron star cooling rates on the equation of state for high density matter in the light, of recent findings which show that the faster direct Urca cooling process is possible for a range of nuclear compositions. We have developed a model for the formation of primordial magnetic fields due to the dynamics of the quark-hadron phase transition. Encouraged by the most recent observational developments, we have investigated the possible origin of the boron and beryllium abundances. We have greatly improved the calculations of the primordial abundances of these elements I>y augmenting the reaction networks and by updating the most recent experimental nuclear reaction rates. Our calculations have shown that the primordial abundances are much higher than previously thought but that the observed abundances cannot be explained by primordial sources alone. We have also studied the origin of the boron and beryllium abundances due to cosmic ray spallation. Finally, we have continued to address the solar neutrino problem by investigating the impact of astrophysical uncertainties on the MSW solution for a full three-family treatment of MSW mixing.

Schramm, D.N.; Olinto, A.V.

1992-09-01

473

EFECTO DE LAS NIIF EN EL VALOR BURSÁTIL DE LAS EMPRESAS ESPAÑOLAS \\/ THE IMPACT OF THE IFRS ON THE MARKET VALUE OF SPANISH FIRMS  

Microsoft Academic Search

El objeto de la presente investigación es comprobar la influencia de la aplicación de las Normas Internacionales de Información Financiera (NIIF) en la valoración de empresas cuando se aplican metodologías basadas en la información suministrada por la contabilidad. A partir de esta información se han obtenido modelos econométricos de valoración utilizando el análisis factorial y se ha procedido a un

F. García García; I. Moya Clemente

2009-01-01

474

Las elecciones presidenciales y legislativas en México de 2006: Lecciones para la estabilidad democrática y el futuro de las relaciones Chile-México  

Microsoft Academic Search

Este artículo analiza las elecciones presidenciales y parlamentarias realizadas en México en julio de 2006, centrándose en cuatro aspectos principales. Primero, abordamos los aspectos centrales del proceso político mexicano de la última década y la campaña presidencial. Segundo, discutimos los efectos del resultado electoral. Tercero, analizamos el difícil proceso político postelectoral, destacándose como causa explicativa de ellos la actuación del

Ricardo Gamboa Valenzuela; Eduardo Bustos Nájera

2007-01-01

475

Nuclear fuel cycle costs  

SciTech Connect

The costs for the back-end of the nuclear fuel cycle, which were developed as part of the Nonproliferation Alternative Systems Assessment Program (NASAP), are presented. Total fuel cycle costs are given for the pressurized water reactor once-through and fuel recycle systems, and for the liquid-metal fast breeder reactor system. These calculations show that fuel cycle costs are a small part of the total power costs. For breeder reactors, fuel cycle costs are about half that of the present once-through system. The total power cost of the breeder reactor system is greater than that of light-water reactor at today's prices for uranium and enrichment.

Burch, W.D.; Haire, M.J.; Rainey, R.H.

1982-02-01

476

Nuclear electric power sources  

NASA Technical Reports Server (NTRS)

Measurements on radioactive commercial p-n junction silicon cells show that these units are capable of delivering several hundred microwatts per curie of Am-241 alpha source, indicating their usefulness in such electronic devices as hearing aids, heart pacemakers, electronic watches, delay timers and nuclear dosimeter chargers. It is concluded that the Am-241 sources are superior to the beta sources used previously, because of higher alpha specific ionization and simultaneous production of low energy photons which are easily converted into photoelectrons for additional power.

Singh, J. J.

1978-01-01

477

Laser induced nuclear reactions  

NASA Astrophysics Data System (ADS)

Dramatic improvements in laser technology since 1984 have revolutionised high power laser technology. Application of chirped-pulse amplification techniques has resulted in laser intensities in excess of 1019 W/cm2. In the mid to late eighties, C. K. Rhodes and K. Boyer discussed the possibility of shining laser light of this intensity onto solid surfaces and to cause nuclear transitions. In particular, irradiation of a uranium target could induce electro- and photofission in the focal region of the laser. In this paper it is shown that ?Ci of 62Cu can be generated via the (?,n) reaction by a laser with an intensity of about 1019 Wcm-2.

Ledingham, Ken; McCanny, Tom; Graham, Paul; Fang, Xiao; Singhal, Ravi; Magill, Joe; Creswell, Alan; Sanderson, David; Allott, Ric; Neely, David; Norreys, Peter; Santala, Marko; Zepf, Matthew; Watts, Ian; Clark, Eugene; Krushelnick, Karl; Tatarakis, Michael; Dangor, Bucker; Machecek, Antonin; Wark, Justin

1998-12-01

478

Upholding California's nuclear moratorium  

SciTech Connect

Case notes on the Pacific Gas and Electric Co. and Southern California Edison Co. suits involving a 1976 amendment to the Warren-Alquist State Energy Resources Conservation and Development Act that banned nuclear power certification until the state approves a demonstrated high-level waste disposal system explain the background of the litigation and the legal precedents used by both sides. The author explains the supremacy clause and the court's search for preemption, either express or implied, when a state regulation conflicts with national objectives. 169 references.

Barrash, M.

1984-01-01

479

Nuclear medicine annual  

SciTech Connect

This book features a state-of-the-art report on single photon emission computed tomography (SPECT) in abdominal imaging, which highlights the emergency of /sup 99m/Tc-red cell imaging as the procedure of choice for diagnosing heptatic hemangioma. In addition, the use of captropril scinitigraphy in the study of suspected renovascular hypertension is reviewed. Articles survey research on radiolabeled monoclonal antibodies and assess the clinical experience with bone scanning for osseous metastases from breast carcinoma. An article on the role of nuclear medicine in the management of osteoporosis examines the problems that must be overcome before the bone mineral analysis with dual photon absorptiometry gains widespread clinical acceptance.

Freeman, L.M.

1988-01-01

480

Nuclear reactor reflector  

DOEpatents

A nuclear reactor reflector is disclosed that comprises a stack of reflector blocks with vertical water flow passages to cool the reflector. The interface between blocks is opposite support points for reactor fuel rods. Water flows between the reflector and the reactor barrel from passages in a bottom block. The top block contains a flange to limit this flow and the flange has a slot to receive an alignment pin that is welded to the barrel. The pin is held in the slot by two removable shims. Alignment bars extend the length of the stack in slots machined in each block when the stack is assembled.

Hopkins, Ronald J. (Pensacola, FL); Land, John T. (Pensacola, FL); Misvel, Michael C. (Pensacola, FL)

1994-01-01

481

Nuclear reactor reflector  

DOEpatents

A nuclear reactor reflector is disclosed that comprises a stack of reflector blocks with vertical water flow passages to cool the reflector. The interface between blocks is opposite support points for reactor fuel rods. Water flows between the reflector and the reactor barrel from passages in a bottom block. The top block contains a flange to limit this flow and the flange has a slot to receive an alignment pin that is welded to the barrel. The pin is held in the slot by two removable shims. Alignment bars extend the length of the stack in slots machined in each block when the stack is assembled. 12 figs.

Hopkins, R.J.; Land, J.T.; Misvel, M.C.

1994-06-07

482

Nuclear waste management  

NASA Astrophysics Data System (ADS)

Progress and activities are reported on the following: highlevel waste immobilization; alternative waste forms; nuclear waste materials characterization; TRU waste immobilization programs; TRU waste decontamination krypton solidification, thermal outgassing, and iodine-129 fixation along with monitoring of unsaturated zone transport, well-logging instrumentation development, and mobile organic complexes of fission products, waste management system and safety studies, assessment of effectiveness of geologic isolation systems, waste/rock interactions technology, spent fuel and fuel pool integrity program, and engineered barriers which are also discussed.

Platt, A. M.; Powell, J. A.

1980-04-01

483

[Nuclear News -- International  

SciTech Connect

Topics discussed in this section are: (1) Tokaimura criticality accident results from improper procedures. (2) IAEA general conference energized by two issues. (3) IAEA Scientific Forum focuses on nuclear's future. (4) TopFuel '99 participants address increased burnup. (5) Russia's Adamov expresses optimism at Uranium Institute annual meeting. (6) Fourth Swiss referendum may be forced by antinukes. (7) India's Kaiga-2 PHWR achieves initial criticality. (8) Heavy-water spill at South Korea's Wolsong-3 ranked as anomaly. (9) Pressure from EU spurs early plant closings.

NONE

1999-11-01

484

Nuclear Magnetic Resonance Gyroscope  

NASA Astrophysics Data System (ADS)

The navigation grade micro Nuclear Magnetic Resonance Gyroscope (micro-NMRG) being developed by the Northrop Grumman Corporation is currently in phase 4 of the DARPA Navigation Grade Integrated Micro Gyro (NGIMG) program. The micro-NMRG technology is pushing the boundaries of size, weight, power, and performance allowing new small platform applications of navigation grade Inertial Navigation System (INS) technology. Information on the historical development of the technology, basics of operation, task performance goals, application opportunities, and a phase 2 sample of earth rate measurement data will be presented.

Larsen, Michael

2011-06-01

485

Nuclear fuel spacer grid  

SciTech Connect

A typical embodiment of the invention provides structural support for the grids in a nuclear reactor fuel assembly. Illustratively, the external surfaces of water rods or instrument tubes in a fuel assembly are provided with annular recesses. A spacer grid retainer is engaged within the recesses by means of spring loaded fingers on the retainer, in which the spring loading forces are greater than anticipated vibration forces to reduce fretting corrosion. Notches formed in the retainer secure the grid to the retainer, all in a manner that simplifies fuel assembly construction and restricts grid movement at lower cost.

Christiansen, D.W.

1980-12-16

486

Nuclear fuel spacer grid  

SciTech Connect

A nuclear reactor fuel assembly spacer grid. The grid straps form an egg crate configuration creating standard cells to enclose the fuel rods. The standard cells have at least one of their straps with an integral spring portion extending into the standard cell and pushing against the fuel rod. A distinct backup spring is positioned transverse to and behind each of the spring portions of the straps and is positioned so as not to touch the fuel rods. The straps are made of a material having a low neutron capture cross-section while the backup spring is made of a material having good radiation stress relaxation properties.

Hellman, J. M.; DeMario, E. E.

1984-10-02

487

Nuclear fuel element  

SciTech Connect

A nuclear fuel element is provided which comprises a cladding tube having end plugs for sealing ends of the cladding tube and a multiplicity of fuel pellets stacked within the cladding tube. Each of the fuel pellets has a substantially cylindrical external lateral surface and a plurality of longitudinal recesses having rounded root portions on the external lateral surface, and has a height within the range from 1/2 to 1/3 of the outer diameter thereof. These fuel pellets with the floral petal shape are stacked in such a manner that the recesses of one pellet are not aligned with the recesses of adjacent upper and/or lower pellets.

Domoto, K.; Hayashi, K.

1981-08-04

488

Adsorption/desorption of linear alkylbenzenesulfonate (LAS) and azoproteins by/from activated sludge flocs.  

PubMed

Our study investigated the adsorption/desorption by/from activated sludge flocs, dispersed in river water or in diluted wastewater, of organic compounds (C(11)-LAS, azoalbumin and azocasein) at concentrations relevant to environmental conditions. Activated sludge flocs, used as a model of biological aggregates, are characterized by a very heterogeneous matrix able to sorb the three organic compounds tested at 4 degrees C. The adsorbed amount of C(11)-LAS by activated sludge flocs was higher than that of azocasein or azoalbumin, as shown by the Freundlich parameters (K(ads)=8.6+/-1.7, 1.6+/-0.3 and 0.3+/-0.1 micromol(1-1/n)g(-1)l(1/n) for C(11)-LAS, azocasein and azoalbumin, respectively; n=3 sludges). C(11)-LAS sorption from activated sludge appeared to be partially reversible in river water, while a marked hysteresis phenomenon was observed for azocasein and azoalbumin, implying a low degree of reversibility in their exchange between activated sludge and river water. It has also been displayed that the conductivity variation of bulk water (comprised between 214 and 838 microS cm(-1)) exerted no dramatic effect on the C(11)-LAS desorption from activated sludge flocs, while a little effect of it on azocasein desorption was observed. Thus, biological aggregates as activated sludge flocs can serve as an intermediate carrier for C(11)-LAS, while it represents a sink for proteins. PMID:15950257

Conrad, A; Cadoret, A; Corteel, P; Leroy, P; Block, J-C

2006-01-01

489

Global position analysis of the Pseudomonas aeruginosa quorum-sensing transcription factor LasR  

PubMed Central

Summary In Pseudomonas aeruginosa quorum sensing (QS), the transcriptional regulator LasR controls the expression of more than 300 genes. Several of these genes are activated indirectly via a second, subordinate QS regulator, RhlR. Conserved sequence elements upstream of individual other genes have been shown to bind LasR in vitro. To comprehensively identify all regions that are bound by LasR in vivo, we employed chromatin immunoprecipitation in conjunction with microarray analysis. We identified 35 putative promoter regions that direct the expression of up to 74 genes. In vitro DNA binding studies allowed us to distinguish between cooperative and non-cooperative LasR binding sites, and allowed us to build consensus sequences according to the mode of binding. Five promoter regions were not previously recognized as QS-controlled. Two of the associated transcript units encode proteins involved in the cold-shock response and in Psl exopolysaccharide synthesis, respectively. The LasR regulon includes seven genes encoding transcriptional regulators, while secreted factors and secretion machinery are the most overrepresented functional categories overall. This supports the notion that the core function of LasR is to coordinate the production of extracellular factors, although many of its effects on global gene expression are likely mediated indirectly by regulatory genes under its control.

Gilbert, Kerrigan B.; Kim, Tae Hoon; Gupta, Rashmi; Greenberg, E. P.; Schuster, Martin

2009-01-01

490

Global nuclear material control model  

SciTech Connect

The nuclear danger can be reduced by a system for global management, protection, control, and accounting as part of a disposition program for special nuclear materials. The development of an international fissile material management and control regime requires conceptual research supported by an analytical and modeling tool that treats the nuclear fuel cycle as a complete system. Such a tool must represent the fundamental data, information, and capabilities of the fuel cycle including an assessment of the global distribution of military and civilian fissile material inventories, a representation of the proliferation pertinent physical processes, and a framework supportive of national or international perspective. They have developed a prototype global nuclear material management and control systems analysis capability, the Global Nuclear Material Control (GNMC) model. The GNMC model establishes the framework for evaluating the global production, disposition, and safeguards and security requirements for fissile nuclear material.

Dreicer, J.S.; Rutherford, D.A.

1996-05-01

491

Common sense in nuclear energy  

SciTech Connect

Public concern about energy resource exhaustion is noted to have developed only after the means (nuclear power) for avoiding this disaster became available and the negative implications of a nuclear society became a focus for anxiety. Ironically, collapse of conventional energy supplies could lead to the nuclear confrontation which anti-nuclear forces claim as the inevitable outcome of nuclear power. A review of the risks, environmental impacts, and political implications of the major energy sources concludes that emotion, not common sense, has made nuclear energy an unpopular option. While the problems of proliferation, radiation protection, waste management, and accident prevention are far from trivial, they will respond to technological improvements and responsible control policies. An historical tradition of fearing new, poorly understood technologies is seen in the reaction to railroads during the early 19th Century. (DCK)

Hoyle, F.; Hoyle, G.

1980-01-01

492

Regional conflicts and nuclear fears  

SciTech Connect

The real danger of nuclear weapons in the Third World is not that developing countries will acquire them, but that advanced countries will intervene in Third World affairs with them. Nuclear weapons can play a part in Third World conflicts in two ways: a recognized nuclear weapon power can threaten to use the weapon in the conflict situation or a clandestine nuclear power may do so. In noting that most conflicts in the Third World can be sustained only through support from the developing countries, the author complains that the Non-Proliferation Treaty is pernicious because it legitimizes the use of nuclear weapons by a few weapon powers. He urges a two-step effort to pressure the North Atlantic Treaty Organization and the United Nations to make nuclear weapons illegal. 17 references.

Subrahmanyam, K.

1984-05-01

493

Ethics and nuclear weapons research  

SciTech Connect

Nuclear weapons are the ultimate weapons. Hence, many believe that in the realm of military research and development, research on nuclear weapons represents the ultimate. Those of us involved in nuclear weapon research are frequently asked why we do what we do, rather than get involved in the more ''peaceful'' endeavors open to scientists and engineers. There is a variety of answers to this question. 15 refs.

Brown, P.S.

1989-01-20

494

Nuclear Physics Laboratory annual report  

SciTech Connect

Progress is reported in these areas: nuclear physics relevant to astrophysics and cosmology; nuclear structure of /sup 14/N; the Cabibbo angle in Fermi matrix elements of high j states; giant resonances; heavy ion reactions; 0/sup +/ - 0/sup -/ isoscalar parity mixing in /sup 14/N; parity mixing in hydrogen and deuterium; medium energy physics; and accelerator mass spectrometry. Accelerators and ion sources, nuclear instrumentation, and computer systems at the university are discussed, including the booster linac project. (LEW)

Trainor, T.A.; Weitkamp, W.G. (eds.)

1985-04-01

495

Swelling-resistant nuclear fuel  

DOEpatents

A nuclear fuel according to one embodiment includes an assembly of nuclear fuel particles; and continuous open channels defined between at least some of the nuclear fuel particles, wherein the channels are characterized as allowing fission gasses produced in an interior of the assembly to escape from the interior of the assembly to an exterior thereof without causing significant swelling of the assembly. Additional embodiments, including methods, are also presented.

Arsenlis, Athanasios (Hayward, CA); Satcher, Jr., Joe (Patterson, CA); Kucheyev, Sergei O. (Oakland, CA)

2011-12-27

496

Solid-State Nuclear Power  

NASA Technical Reports Server (NTRS)

A strategy for "Solid-State" Nuclear Power is proposed to guide development of technologies and systems into the second 50 years of nuclear spaceflight. The strategy emphasizes a simple and highly integrated system architecture with few moving parts or fluid loops; the leverage of modern advances in materials, manufacturing, semiconductors, microelectromechanical and nanotechnology devices; and the targeted advancement of high temperature nuclear fuels, materials and static power conversion to enable high performance from simple system topologies.

George, Jeffrey A.

2012-01-01

497

Psychological aspects of nuclear war  

SciTech Connect

Exploring the nature of nuclear war, this treatise examines human reaction to nuclear disaster and accidental explosions. The discussion is based on evidence of human fallibility that has emerged from the psychology of accidents and from research into decision-making in military and political contexts. The book draws on the psychology of negotiation and conflict resolution to suggest ways in which the threat of nuclear war might be reduced.

Thompson, J.

1985-01-01

498

Sustainable futures using nuclear energy  

Microsoft Academic Search

We present the role of nuclear energy in a sustainable future. This addresses the social, economic and environmental concerns of us all. Nuclear energy today avoids the emission of nearly two billion tonnes of greenhouse gases (GHGs) each year, thanks to over 400 reactors operating worldwide.Nevertheless, there is no real recognition of real incentives for large-scale non-emitters like nuclear energy

Romney B. Duffey

2005-01-01

499

Hands-On Nuclear Physics  

NASA Astrophysics Data System (ADS)

Nuclear science is an important topic in terms of its application to power generation, medical diagnostics and treatment, and national defense. Unfortunately, the subatomic domain is far removed from daily experience, and few learning aids are available to teachers. What follows describes a low-tech, hands-on method to teach important concepts in nuclear physics, including the quark model, anti-matter, nuclear binding energy, stability, the nuclear shell model, and the importance of symmetry, by making use of neodymium disc magnets.

Whittaker, Jeff

2013-03-01

500

Evaluated nuclear structure data file  

NASA Astrophysics Data System (ADS)

The Evaluated Nuclear Structure Data File (ENSDF) contains the evaluated nuclear properties of all known nuclides. These properties are derived both from nuclear reaction and radioactive decay measurements. All experimental data are evaluated to create the adopted properties for each nuclide. ENSDF, together with other numeric and biographic files, can be accessed on-line through the INTERNET or modem. Some of the databases are also available on the World Wide Web. The structure and the scope of ENSDF are presented along with the on-line access system of the National Nuclear Data Center at Brookhaven National Laboratory.

Tuli, J. K.