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1

Russia - Nato. The military balance.  

E-Print Network [OSTI]

??This project aims to explain how the military balancing of Russia against NATO can be explained from a neoclassical realist framework. The project consists in… (more)

Skarequist, Anne

2010-01-01T23:59:59.000Z

2

The NATO-Russia Council - a Success?.  

E-Print Network [OSTI]

??After the end of the Cold War and the dissolution of the Soviet Union in 1991, NATO and Russia concluded that «they no longer regarded… (more)

Tresselt, Line

2010-01-01T23:59:59.000Z

3

Nuclear weapons and NATO-Russia relations  

SciTech Connect (OSTI)

Despite the development of positive institutional arrangements such as Russian participation in the NATO-led peacekeeping force in Bosnia and the NATO- Russia Permanent Joint Council, the strategic culture of Russia has not changed in any fundamental sense. Russian strategic culture has not evolved in ways that would make Russian policies compatible with those of NATO countries in the necessary economic, social, technological, and military spheres. On the domestic side, Russia has yet to establish a stable democracy and the necessary legal, judicial, and regulatory institutions for a free-market economy. Russia evidently lacks the necessary cultural traditions, including concepts of accountability and transparency, to make these adaptations in the short-term. Owing in part to its institutional shortcomings, severe socioeconomic setbacks have afflicted Russia. Russian conventional military strength has been weakened, and a concomitant reliance by the Russians on nuclear weapons as their ultimate line of defense has increased. The breakdown in the infrastructure that supports Russian early warning and surveillance systems and nuclear weapons stewardship defense, coupled with a tendency towards has exacerbated Russian anxiety and distrust toward NATO. Russia`s reliance on nuclear weapons as the ultimate line of defense, coupled with a tendency toward suspicion and distrust toward NATO, could lead to dangerous strategic miscalculation and nuclear catastrophe.

Cornwell, G.C.

1998-12-01T23:59:59.000Z

4

Friend and foe? : Russia in NATO's strategy 1991-2011.  

E-Print Network [OSTI]

??The thesis investigates how NATO has managed its relations with Russia during the 1991-2011 periods. The analysis is on two levels – a strategic level… (more)

Nygaard, Ida

2012-01-01T23:59:59.000Z

5

NATO : Network Architecture Tensile Organization : mending Berlin through public interface  

E-Print Network [OSTI]

NATO: Network Architecture; Tensile Organization is a project that seeks to create a lighter public forum where architecture mediates a space of metaphor, yet looks towards a hopeful future, in a place laden with the ...

Vassilev, Vasilena (Vasilena R.)

2009-01-01T23:59:59.000Z

6

The Fish Barcode of Life (FISH-BOL) special issue ROBERT HANNER1  

E-Print Network [OSTI]

sexes, and perhaps more subtle shifts across geographic ranges. Meanwhile, more efficient harvest methods, increas- ing consumer demand and globalization of trade, combined with other anthropogenic to those involved in the construction and expansion of large-scale databases such as FISH-BOL, and see

DeSalle, Rob

7

E-Print Network 3.0 - affect nato expansion Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Han et al, Nato Science Series 2. Nato-Series 2003 93 Kluwer... Academic Publishers Netherland. 8 P. G. Kik et al, in Towards the First Silicon ... Source: Park, Namkyoo -...

8

Menace of Power: Russia-NATO Relations in the Post-Cold War Era.  

E-Print Network [OSTI]

??This thesis explores Russia-NATO relations after the Cold War. It focuses on how state power and perceived threat affect balance of power in Europe. The… (more)

Chen, Ping-Kuei

2008-01-01T23:59:59.000Z

9

Why Russia and NATO fail to reach a normative partnership : An analysis of the post-Cold War period.  

E-Print Network [OSTI]

??After the dissolution of the Soviet Union in 1991, The North Atlantic Treaty Organization (NATO) and the Russian Federation both stated that ‘we no longer… (more)

Sletmoen, Signe Lill

2011-01-01T23:59:59.000Z

10

Zeolite-catalyzed ring-shift isomerization of sym-Octahydrophenanthrene into sym-Octahydroanthracene. Experimental results and calculated equilibrium compositions  

SciTech Connect (OSTI)

Phenanthrene and its derivatives are abundant in coal-derived liquids from coal carbonization, pyrolysis, and liquefaction; however, they are used in industries only to a limited extent despite of considerable efforts. On the other hand, their isomers, anthracene and its derivatives such as sym-octahydroanthracene (sym-OHA), are more useful materials for industrial applications. Anthracene and its derivatives may be used as the starting materials for the manufacturing of anthraquinone (an effective pulping accelerator), pyromellitic dianhydride (PMDA, the monomer for polyimides such as Du Pont`s Kapton), and dyestuffs. Thus, it is desirable to convert phenanthrenes to anthracenes. This paper discusses the isomerization of sym-octahydrophenanthrene into sym-OHA.

Lai, Wei-Chuan; Song, Chunshan [Pennsylvania State Univ., University Park, PA (United States); Duin Adri van; Leeuw, J.W. de [Netherlands Institute of Sea Research, Den Burg (Netherlands)

1995-12-31T23:59:59.000Z

11

Synthesis, characterization and performance of single-component CO2-binding organic liquids (CO2BOL) for post combustion CO2 capture  

SciTech Connect (OSTI)

Carbon dioxide (CO2) emission to the atmosphere will increase significantly with the shift to coal powered plants for energy generation. This increase in CO2 emission will contribute to climate change. There is need to capture and sequester large amounts of CO2 emitted from these coal power plants in order to mitigate the environmental effects. Here we report the synthesis, characterization and system performance of multiple third generation CO2 binding organic liquids (CO2BOLs) as a solvent system for post combustion gas capture. Alkanolguanidines and alkanolamidines are single component CO2BOLs that reversibly bind CO2 chemically as liquid zwitterionic amidinium / guanidinium alkylcarbonates. Three different alkanolguanidines and alkanolamidines were synthesized and studied for CO2 capacity and binding energetics. Solvent performance of these three CO2BOLs was evaluated by batch-wise CO2 uptake and release over multiple cycles. Synthesis of CO2BOLs, characterization, CO2 uptake, selectivity towards CO2 as well as solvent tolerance to water will be discussed.

Koech, Phillip K.; Heldebrant, David J.; Rainbolt, James E.; Zheng, Feng; Smurthwaite, Tricia D.

2010-03-31T23:59:59.000Z

12

Conformal invariance of the planar beta-deformed N=4 SYM theory requires beta real  

E-Print Network [OSTI]

We study the \\cal{N}=1 SU(N) SYM theory which is a marginal deformation of the \\cal{N}=4 theory, with a complex deformation parameter \\beta. We consider the large N limit and study perturbatively the conformal invariance condition. We find that finiteness requires reality of the deformation parameter \\beta.

Federico Elmetti; Andrea Mauri; Silvia Penati; Alberto Santambrogio; Daniela Zanon

2006-06-14T23:59:59.000Z

13

Dropped in Tripoli; Exploded in New York: Assessing the Collateral Consequences of NATO's [Mis]leading Intervention in Libya  

E-Print Network [OSTI]

]leading Intervention in Libya Eberechi Ifeonu* "The strong do what they have the power to do and the weak accept what, Justin Bieber ­ NATO announced the end of its "humanitarian mission" in Libya. While the mood, with the media curiously predicting that "after Gadhafi, Libya's oil will flow ­ slowly." This paper interrogates

Volesky, Bohumil

14

Survival probability of large rapidity gaps in QCD and N=4 SYM motivated model  

E-Print Network [OSTI]

In this paper we present a self consistent theoretical approach for the calculation of the Survival Probability for central dijet production . These calculations are performed in a model of high energy soft interactions based on two ingredients:(i) the results of N=4 SYM, which at the moment is the only theory that is able to deal with a large coupling constant; and (ii) the required matching with high energy QCD. Assuming, in accordance with these prerequisites, that soft Pomeron intercept is rather large and the slope of the Pomeron trajectory is equal to zero, we derive analytical formulae that sum both enhanced and semi-enhanced diagrams for elastic and diffractive amplitudes. Using parameters obtained from a fit to the available experimental data, we calculate the Survival Probability for central dijet production at energies accessible at the LHC. The results presented here which include the contribution of semi-enhanced and net diagrams, are considerably larger than our previous estimates.

Gotsman, E; Maor, U

2011-01-01T23:59:59.000Z

15

Survival probability of large rapidity gaps in QCD and N=4 SYM motivated model  

E-Print Network [OSTI]

In this paper we present a self consistent theoretical approach for the calculation of the Survival Probability for central dijet production . These calculations are performed in a model of high energy soft interactions based on two ingredients:(i) the results of N=4 SYM, which at the moment is the only theory that is able to deal with a large coupling constant; and (ii) the required matching with high energy QCD. Assuming, in accordance with these prerequisites, that soft Pomeron intercept is rather large and the slope of the Pomeron trajectory is equal to zero, we derive analytical formulae that sum both enhanced and semi-enhanced diagrams for elastic and diffractive amplitudes. Using parameters obtained from a fit to the available experimental data, we calculate the Survival Probability for central dijet production at energies accessible at the LHC. The results presented here which include the contribution of semi-enhanced and net diagrams, are considerably larger than our previous estimates.

E. Gotsman; E. Levin; U. Maor

2011-03-04T23:59:59.000Z

16

Gauge/Gravity Duality, Green Functions of N=2 SYM and Radial/Energy-Scale Relation  

E-Print Network [OSTI]

We consider supergravity configuration of D5 branes wrapped on supersymmetric 2-cycles and use it to calculate one-point and two-point Green functions of some special operators in N=2 super Yang-Mills theory. We show that Green functions obtained from supergravity include two very different parts. One of them corresponds to perturbative results of quantum field theory, and another is a non-perturbative effect which corresponds to contribution from instantons with fractional charge. Comparing Green functions obtained from supergravity and gauge theory, we obtain radial/energy-scale relation for this gauge/gravity correspondence with N=2 supersymmetry. This relation leads right beta-function of N=2 SYM from supergravity configuration.

Xiao-Jun Wang; Seng Hu

2002-07-19T23:59:59.000Z

17

Quantum Spectral Curve at Work: From Small Spin to Strong Coupling in N=4 SYM  

E-Print Network [OSTI]

We apply the recently proposed quantum spectral curve technique to the study of twist operators in planar N=4 SYM theory. We focus on the small spin expansion of anomalous dimensions in the sl(2) sector and compute its first two orders exactly for any value of the 't Hooft coupling. At leading order in the spin S we reproduced Basso's slope function. The next term of order S^2 structurally resembles the Beisert-Eden-Staudacher dressing phase and takes into account wrapping contributions. This expansion contains rich information about the spectrum of local operators at strong coupling. In particular, we found a new coefficient in the strong coupling expansion of the Konishi operator dimension and confirmed several previously known terms. We also obtained several new orders of the strong coupling expansion of the BFKL pomeron intercept. As a by-product we formulated a prescription for the correct analytical continuation in S which opens a way for deriving the BFKL regime of twist two anomalous dimensions from AdS/CFT integrability.

Nikolay Gromov; Fedor Levkovich-Maslyuk; Grigory Sizov; Saulius Valatka

2014-03-27T23:59:59.000Z

18

Chiral low-energy physics from squashed branes in deformed ${\\cal N}=4$ SYM  

E-Print Network [OSTI]

We discuss the low-energy physics which arises on stacks of squashed brane solutions of $SU(N)$ ${\\cal N}=4$ SYM, deformed by a cubic soft SUSY breaking potential. A brane configuration is found which leads to a low-energy physics similar to the standard model in the broken phase, assuming suitable VEV's of the scalar zero modes. Due to the triple self-intersection of the branes, the matter content includes that of the MSSM with precisely 3 generations and right-handed neutrinos. No exotic quantum numbers arise, however there are extra chiral superfields with the quantum numbers of the Higgs doublets, the $W,Z$, $e_R$ and $u_R$, whose fate depends on the details of the rich Higgs sector. The chiral low-energy sector is complemented by a heavy mirror sector with the opposite chiralities, as well as super-massive Kaluza-Klein towers completing the ${\\cal N}=4$ multiplets. The sectors are protected by two gauged global $U(1)$ symmetries.

Steinacker, Harold C

2015-01-01T23:59:59.000Z

19

The history of NATO TNF policy: The role of studies, analysis and exercises conference proceedings. Volume 2: Papers and presentations  

SciTech Connect (OSTI)

This conference was organized to study and analyze the role of simulation, analysis, modeling, and exercises in the history of NATO policy. The premise was not that the results of past studies will apply to future policy, but rather that understanding what influenced the decision process -- and how -- would be of value. The structure of the conference was built around discussion panels. The panels were augmented by a series of papers and presentations focusing on particular TNF events, issues, studies, or exercises. The conference proceedings consist of three volumes. Volume 1 contains the conference introduction, agenda, biographical sketches of principal participants, and analytical summary of the presentations and panels. This volume contains a short introduction and the papers and presentations from the conference. Volume 3 contains selected papers by Brig. Gen. Robert C. Richardson III (Ret.). Individual papers in this volume were abstracted and indexed for the database.

Rinne, R.L.

1994-02-01T23:59:59.000Z

20

The history of NATO TNF policy: The role of studies, analysis and exercises conference proceedings. Volume 1, Introduction and summary  

SciTech Connect (OSTI)

This conference was organized to study and analyze the role of simulation, analysis, modeling, and exercises in the history of NATO policy. The premise was not that the results of past studies will apply to future policy, but rather that understanding what influenced the decision process -- and how -- would be of value. The structure of the conference was built around discussion panels. The panels were augmented by a series of papers and presentations focusing on particular TNF events, issues, studies or exercise. The conference proceedings consist of three volumes. This volume, Volume 1, contains the conference introduction, agenda, biographical sketches of principal participants, and analytical summary of the presentations and discussion panels. Volume 2 contains a short introduction and the papers and presentations from the conference. Volume 3 contains selected papers by Brig. Gen. Robert C. Richardson III (Ret.).

Rinne, R.L. [ed.

1994-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "nato sym bol" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

On the internal space dependence of the static quark-antiquark potential in ${\\cal N}=4$ SYM plasma wind  

E-Print Network [OSTI]

We study the effect of the relative S^5-angle of a quark and an antiquark on their static potential and the related screening length in a strongly coupled moving ${\\cal N}=4$ SYM plasma. The large velocity scaling law for the screening length holds for any relative S^5-angle $\\theta$. However, the velocity independent prefactor Z strongly depends on $\\theta$. For comparison with QCD we propose to average Z over all relative orientations on S^5. This generates a suppression factor relative to the case $\\theta =0$.

Harald Dorn; Thanh Hai Ngo

2007-07-26T23:59:59.000Z

22

Hazen, T. C., A. J. Tien, A. Worsztynowicz, D. J. Altman, K. Ulfig, and T. Manko. 2003. Biopiles for Remediation of Petroleum-Contaminated Soils: A Polish Case Study. NATO Advanced Research  

E-Print Network [OSTI]

(a)pyrene and BTEX compounds were identified as the contaminants of concern. Approximately 3,300 m3 of contaminated for Remediation of Petroleum-Contaminated Soils: A Polish Case Study. NATO Advanced Research Workshop Volume on The Utilization of Bioremediation to Reduce Soil Contamination: Problems and Solutions. V. Sasek, J. Glaser, and P

Hazen, Terry

23

The history of NATO TNF policy: The role of studies, analysis and exercises conference proceedings. Volume 3: Papers by Gen. Robert C. Richardson III (Ret.)  

SciTech Connect (OSTI)

This conference was organized to study and analyze the role of simulation, analysis, modeling, and exercises in the history of NATO policy. The premise was not that the results of past studies will apply to future policy, but rather that understanding what influenced the decision process-and how-would be of value. The structure of the conference was built around discussion panels. The panels were augmented by a series of papers and presentations focusing on particular TNF events, issues, studies, or exercises. The conference proceedings consist of three volumes. Volume 1 contains the conference introduction, agenda, biographical sketches of principal participants, and analytical summary of the presentations and discussion panels. Volume 2 contains a short introduction and the papers and presentations from the conference. This volume contains selected papers by Brig. Gen. Robert C. Richardson III (Ret.).

Rinne, R.L. [ed.

1994-02-01T23:59:59.000Z

24

Politics of NATO short-range nuclear modernization 1983-1990: The follow-on-to-Lance missile decisions. Doctoral thesis  

SciTech Connect (OSTI)

The follow-on to Lance (FOTL) missile was born in 1983 with a consensual decision by NATO, in the face of a worsening strategic situation, to pursue short-range nuclear force (SNF) modernization. The program continued despite increasing popular and political opposition in Europe. It ended with a May 1990 cancellation decision by the American bureaucracy that reflected converging pressures from the international system, from America's allies, and from the domestic arena. The thesis attempts to answer each question through the use of one of three analytical perspectives: systemic theory, alliance politics, or domestic politics. It concludes that during this time of diminishing threat at the systemic level, domestic-level factors within the German and American milieu became more important. While certain perspectives are better at explaining particular aspects or temporal periods of modernization cases, analysts should not focus on one perspective to the exclusion of others. Unexplained residual variables fall through the filter of each perspective, calling for further study by other approaches.

Larsen, J.A.

1991-06-01T23:59:59.000Z

25

NATO-Russia Security Council and NATO Summit 2009.  

E-Print Network [OSTI]

??Die M?ster ?rbeit unter den Titel „N?T?-Russl?nd R?t und N?T?-Gipfel 2009“ verf?lgt ein Ziel um ?merik?nische-Russische Beziehung in R?mmen der N?rd?tl?ntikp?kt-?rg?nis?ti?n ?n?lysieren. Der Mittelpunkt der… (more)

Podobinska, Tetyana

2009-01-01T23:59:59.000Z

26

Bol. Soc. Esp. Mat. Apl. no 0 (0000), 126  

E-Print Network [OSTI]

, los efectos de la rotaci´on terrestre, la tensi´on superficial debida al viento y la fricci´on con el de extra~nar, por tanto, que exista en la actualidad una gran cantidad y diversidad de modelos

Politècnica de Catalunya, Universitat

27

Bol. Soc. Esp. Mat. Apl. no 0 (0000), 133  

E-Print Network [OSTI]

coupling, new applications of layered magnetic structures are being considered [5, 6, 7]. Multilayers have good permanent magnet properties, and in particular, a high coercive field and approximately spontaneous magnetization. The magnetization in ferromagnetic materials can exhibit intricate domain

Bigelow, Stephen

28

Iceland is a small democratic state of nearly 300,000 inhabitants that sits in the North Atlantic between the continents of Europe, America, and the Arctic.1  

E-Print Network [OSTI]

CODE, with the Health Sector Database relegated to the dustbin of history, it is more important than ever to probe remains: the country's Health Sector Database, an international sym- bol of the new state-led genomics. Eight years ago, Iceland passed the Health Sector Database (HSD) Act, which authorized the construction

Silver, Whendee

29

Heidelberg University Institute of Environmental Physics  

E-Print Network [OSTI]

geothermal gradient (red line) is 0.014 K m-1 . The deviation from the mean temperature (green sym- bols, the fluctuations become negligible and the tem- perature profile is dominated by the geothermal heat flux which results from the cooling of the Earth's core and from radioactive decay. It amounts to some 0.05 W m-2

Roth, Kurt

30

Critical phenomena in N=4 SYM plasma  

E-Print Network [OSTI]

Strongly coupled N=4 supersymmetric Yang-Mills plasma at finite temperature and chemical potential for an R-symmetry charge undergoes a second order phase transition. We demonstrate that this phase transition is of the mean field theory type. We explicitly show that the model is in the dynamical universality class of 'model B' according to the classification of Hohenberg and Halperine, with dynamical critical exponent z=4. We study bulk viscosity in the mass deformed version of this theory in the vicinity of the phase transition. We point out that all available models of bulk viscosity at continuous phase transition are in conflict with our explicit holographic computations.

Alex Buchel

2010-05-05T23:59:59.000Z

31

Bol. Asoc. Herpetol. Esp. (2008) 192 El Mediterrneo Occidental constituye uno  

E-Print Network [OSTI]

y reptiles en el Mediterráneo Occidental Juan M. Pleguezuelos1 , Soumía Fahd2 & Salvador Carranza3 1-UPF). Paseo Marítimo de la Barceloneta, 37-49. 08003 Barcelona. España. C.e.: salvador

Carranza, Salvador

32

Universidad Sim'on Bol'ivar Departamento de Computaci'on y  

E-Print Network [OSTI]

Algoritmos y Estructuras II TAD Libro Especificaci'on Formal TAD Libro Sintaxis Crear : String \\Theta String

Meza, Oscar J.

33

Derk Bol, Materials Innovation Institute M2i (Netherlands) M2i, Material  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector General Office of Audit Services AuditTransatlantic Relations & the196-2011 April 2011

34

NATO Science for Peaceand Security Series This Series presents the results of scientific meetings supported under the NATO  

E-Print Network [OSTI]

'universities incl'ude curricular enhancement through projects related to topics such as energy, food systems, waste an intense but informal exchange of views at the frontiers of a subject aims at identifying directionsfor future action Following a transformationof the programme in 2006 the Series has been re-namedand re

35

Progress in study of N=4 SYM effective action  

E-Print Network [OSTI]

We review the basic results concerning the structure of effective action in N=4 supersymmetric Yang-Mills theory in Coulomb phase. Various classical formulations of this theory are considered. We show that the low-energy effective action depending on all fileds of N=4 vector multiplet can be exactly found. This result is discussed on the base of algebraic analysis exploring the general harmonic superspace techniques and on the base of straightforward quantum field theory calculations using the N=2 supersymmetric background field method. We study the one-loop effective action beyond leading low-energy approximation and construct supersymmetric generalization of Heisenberg-Euler-Schwinger effective action depending on all fields of N=4 vector multiplet. We also consider the derivation of leading low-enrgy effective action at two loops.

I. L. Buchbinder

2004-02-12T23:59:59.000Z

36

Progress in study of N=4 SYM effective action  

E-Print Network [OSTI]

We review the basic results concerning the structure of effective action in N=4 supersymmetric Yang-Mills theory in Coulomb phase. Various classical formulations of this theory are considered. We show that the low-energy effective action depending on all fileds of N=4 vector multiplet can be exactly found. This result is discussed on the base of algebraic analysis exploring the general harmonic superspace techniques and on the base of straightforward quantum field theory calculations using the N=2 supersymmetric background field method. We study the one-loop effective action beyond leading low-energy approximation and construct supersymmetric generalization of Heisenberg-Euler-Schwinger effective action depending on all fields of N=4 vector multiplet. We also consider the derivation of leading low-enrgy effective action at two loops.

Buchbinder, I L

2004-01-01T23:59:59.000Z

37

Parton picture for the strongly coupled SYM plasma  

E-Print Network [OSTI]

Deep inelastic scattering off the strongly coupled N=4 supersymmetric Yang-Mills plasma at finite temperature can be computed within the AdS/CFT correspondence, with results which are suggestive of a parton picture for the plasma. Via successive branchings, essentially all partons cascade down to very small values of the longitudinal momentum fraction x and to transverse momenta smaller than the saturation momentum Q_s\\sim T/x. This scale Q_s controls the plasma interactions with a hard probe, in particular, the jet energy loss and its transverse momentum broadening.

E. Iancu

2008-05-27T23:59:59.000Z

38

Film-Flam: How MPAA/NATO movie labels hide the biggest media risk to kids  

E-Print Network [OSTI]

News Corp. News Corp. News Corp. News Corp. News Corp. SonySonySony Sony Sony Sony Sony Sony Sony Sony Sony Sony Sony Sony

Polansky, Jonathan R.; Mitchell, Shelley; Glantz, Stanton A.

2010-01-01T23:59:59.000Z

39

NATO Simulation Pressures Students to Forge a Response to Threatening International Incidents  

E-Print Network [OSTI]

an attempt by Kurdish militants to damage an oil pipeline that runs from Baku on the Caspian Sea infrastructure. Other reports follow just minutes apart. Turkish offi- cials announce that they have thwarted Russia may be intent on disrupting the flow of oil through the Baku-Tblisi-Ceyhan pipe- line. Turkey

40

NATO CCMS Pilot Study on Clean Products and Processes 2003 Annual Meeting, May 11 -15, 2003  

E-Print Network [OSTI]

.edu, knopf@che.lsu.edu c Lamar University, Beaumont, TX 77710, hopperjr@hal.lamar.edu, yawscl@hal.lamar

Pike, Ralph W.

Note: This page contains sample records for the topic "nato sym bol" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Chromidio: an interface for color tracking with key frames in Max and Nato  

E-Print Network [OSTI]

11 QuickTime Movie Input 11 Interactive Color Picking 12 Key Frames 12 Useful Output 14 File Management 16 C.play I 6 IV I M P L E M E N T A T I O N A N D RESULTS 17 Chromidio User Interface 17 QuickTime Movie Display and Playback 22 vi i... CHAPTER Page Interactive Color Picking 26 Key Frame Management 27 Data Analysis and Output 32 Project File Management 36 C.play 39 User Interface 39 Mathematical Functions and F ilters 41 MIDI Implementations 44 Output : 46 Results Using C...

Tucker, Amy Rebecca

2002-01-01T23:59:59.000Z

42

Nato Workshop: Embedded Security August 2005 1 Challenges In Deeply Networked  

E-Print Network [OSTI]

of internal combustion to battery power in the car's engine, based on data from the internal vehicle sensors the servers and commands all hybrid vehicles to perform 100% internal combustion on a smoggy day? What happens

Koopman, Philip

43

Instituto de Investigaciones Marinas y Costeras -INVEMAR 191 Bol. Invest. Mar. Cost. 39 (1) ISSN 0122-9761 Santa Marta, Colombia, 2010  

E-Print Network [OSTI]

0122-9761 Santa Marta, Colombia, 2010 NOTA: FAUNA NOCTURNA ASOCIADA A LOS MANGLARES Y OTROS HUMEDALES, ProCAT Colombia/Internacional. sabalaguera@procat-conservation.org, jfgonzalez@procat-conservation.org 2Universidad Nacional de Colombia sede Caribe, CECIMAR/INVEMAR, Cerro Punta Betín, Santa Marta

Nacional Autónoma de México, Universidad

44

Universidad Sim#n Bol#var Departamento de Computaci#n y Tecnolog#a de la Informaci#n  

E-Print Network [OSTI]

pseudo­lenguaje con una sola guardia. Por ello, contamos con el siguiente esquema de traducci#n: i do una iteraci#n equivalente de una sola guardia. Veamos los casos de 2 y 3 guardias, dejando al lector#n unitaria (esto es, con una sola guardia), que es entonces traducible a un while de Java. 2 Otras

Meza, Oscar J.

45

Universidad Sim#n Bol#var Departamento de Computaci#n y Tecnolog#a de la Informaci#n  

E-Print Network [OSTI]

[] :B ! I 1 ø j . El segundo corresponde a construir un condicional con una sola rama i if (B) I j , que esta #ltima instrucci#n que, aunque haya una sola instrucci#n simple dentro del cuerpo del condicional programador requiere inicialmente una sola ins­ trucci#n simple dentro de una rama de un condicional, la cual

Meza, Oscar J.

46

Universidad Sim'on Bol'ivar Dpto. de Computaci'on y Tecnolog'ia de la Informaci'on  

E-Print Network [OSTI]

Investigaci'on en Sistemas Paralelos y Distribuidos Evaluaci'on de Arquitecturas de Multihilos para (Multithreads) en ORBs ffl Permiten ejecutar varias operaciones en forma simult'anea. ffl Simplifican el dise

Cardinale Villarreal, Yudith C.

47

Born--Oppenheimer corrections to the effective zero-mode Hamiltonian in SYM theory  

E-Print Network [OSTI]

We calculate the subleading terms in the Born--Oppenheimer expansion for the effective zero-mode Hamiltonian of N = 1, d=4 supersymmetric Yang--Mills theory with any gauge group. The Hamiltonian depends on 3r abelian gauge potentials A_i, lying in the Cartan subalgebra, and their superpartners (r being the rank of the group). The Hamiltonian belongs to the class of N = 2 supersymmetric QM Hamiltonia constructed earlier by Ivanov and I. Its bosonic part describes the motion over the 3r--dimensional manifold with a special metric. The corrections explode when the root forms \\alpha_j(A_i) vanish and the Born--Oppenheimer approximation breaks down.

A. V. Smilga

2002-09-18T23:59:59.000Z

48

Radiation by a heavy quark in N=4 SYM at strong coupling  

E-Print Network [OSTI]

Using the AdS/CFT correspondence in the supergravity approximation, we compute the energy density radiated by a heavy quark undergoing some arbitrary motion in the vacuum of the strongly coupled N=4 supersymmetric Yang-Mills theory. We find that this energy is fully generated via backreaction from the near-boundary endpoint of the dual string attached to the heavy quark. Because of that, the energy distribution shows the same space-time localization as the classical radiation that would be produced by the heavy quark at weak coupling. We believe that this and some other unnatural features of our result (like its anisotropy and the presence of regions with negative energy density) are artifacts of the supergravity approximation, which will be corrected after including string fluctuations. For the case where the quark trajectory is bounded, we also compute the radiated power, by integrating the energy density over the surface of a sphere at infinity. For sufficiently large times, we find agreement with a previous calculation by Mikhailov [hep-th/0305196].

Y. Hatta; E. Iancu; A. H. Mueller; D. N. Triantafyllopoulos

2011-02-01T23:59:59.000Z

49

The Higgs boson mass and SUSY spectra in 10D SYM theory with magnetized extra dimensions  

E-Print Network [OSTI]

We study the Higgs boson mass and the spectrum of supersymmetric (SUSY) particles in the well-motivated particle physics model derived from a ten-dimensional supersymmetric Yang-Mills theory compactified on three factorizable tori with magnetic fluxes. This model was proposed in a previous work, where the flavor structures of the standard model including the realistic Yukawa hierarchies are obtained from non-hierarchical input parameters on the magnetized background. Assuming moduli- and anomaly-mediated contributions dominate the soft SUSY breaking terms, we study the precise SUSY spectra and analyze the Higgs boson mass in this mode, which are compared with the latest experimental data.

Hiroyuki Abe; Junichiro Kawamura; Keigo Sumita

2014-05-27T23:59:59.000Z

50

Thermal N = 4 SYM theory as a 2D Coulomb gas  

E-Print Network [OSTI]

We consider N = 4 supersymmetric Yang-Mills theory with SU(N) gauge group at large N and at finite temperature on a spatial S^3. We show that, at finite weak 't Hooft coupling, the theory is naturally described as a two dimensional Coulomb gas of complex eigenvalues of the Polyakov-Maldacena loop, valued on the cylinder. In the low temperature confined phase the eigenvalues condense onto a strip encircling the cylinder, while the high temperature deconfined phase is characterised by an ellipsoidal droplet of eigenvalues.

Sean A. Hartnoll; S. Prem Kumar

2006-10-10T23:59:59.000Z

51

Energy Loss of Gluons, Baryons and k-Quarks in an N=4 SYM Plasma  

E-Print Network [OSTI]

We consider different types of external color sources that move through a strongly-coupled thermal N=4 super-Yang-Mills plasma, and calculate, via the AdS/CFT correspondence, the dissipative force (or equivalently, the rate of energy loss) they experience. A bound state of k quarks in the totally antisymmetric representation is found to feel a force with a nontrivial k-dependence. Our result for k=1 (or k=N-1) agrees at large N with the one obtained recently by Herzog et al. and Gubser, but contains in addition an infinite series of 1/N corrections. The baryon (k=N) is seen to experience no drag. Finally, a heavy gluon is found to be subject to a force which at large N is twice as large as the one experienced by a heavy quark, in accordance with gauge theory expectations.

Mariano Chernicoff; Alberto Guijosa

2007-02-08T23:59:59.000Z

52

U.S.-Russian experts NATO collaborative research grant exchange visit meeting on excess Pu ceramics formulations and characterizations  

SciTech Connect (OSTI)

This document contains the agenda and meeting notes. Topics of discussion included US Pu disposition ceramics activities, Russian experience and proposals in Pu ceramics, and development of possible Russian ceramic proposals or collaborations.

Jardine, L.J., LLNL

1998-11-24T23:59:59.000Z

53

ANDREA BRANZI curriculum Andrea Branzi, Architetto e Designer, nato a Firenze dove si laureato; vive e lavora a  

E-Print Network [OSTI]

della Comunicazione dell'Università di Parma, al Centro Georges Pompidou di Parigi e al FRAC di Orléans

54

Tsunami Information Sources: Part 4 (With a section on impulsively generated waves by a rapid mass movement, either submerged, or into a body of water)  

E-Print Network [OSTI]

Generation, Modeling, Risk and Mitigation, NATO Science Series, IV,Generation, Modeling, Risk and Mitigation, NATO Science Series, IV,Generation, Modeling, Risk and Mitigation, Istanbul, Turkey, May 23-26, 2001, NATO Science Series, IV,

Wiegel, Robert L.

2008-01-01T23:59:59.000Z

55

Self-intersecting fuzzy extra dimensions from squashed coadjoint orbits in ${\\cal N}=4$ SYM and matrix models  

E-Print Network [OSTI]

We find new vacuum solutions of ${\\cal N}=4$ super-Yang-Mills with totally anti-symmetric cubic soft SUSY breaking terms, or equivalently solutions of the IKKT matrix model of type $\\mathbb{R}^4_\\theta \\times {\\cal K}_N$ with flux terms. The solutions can be understood in terms of 4- and 6- dimensional fuzzy branes ${\\cal K}_N$ in extra dimensions, describing self-intersecting projections of compact flag manifolds of $SU(3)$. The 6-dimensional solutions provide a 6-fold covering of the internal space near the origin, while the 4-dimensional branes have a triple self-intersections spanning all 6 internal directions. The solutions have lower energy than the trivial vacuum, and we prove that there are no negative modes. The massless modes are identified explicitly. In particular there are chiral fermionic zero modes, linking the coincident sheets with opposite flux at the origin. They have a $\\mathbb{Z}_3$ family symmetry, originating from the Weyl group rotations.

Harold C. Steinacker; Jochen Zahn

2014-09-04T23:59:59.000Z

56

Bol. Mus. Para. Emlio Goeldi. Cincias Humanas, Belm, v. 3, n. 2, p. 195-211, maio-ago. 2008 A cidade, um foco de diversidade agrcola no Rio Negro (Amazonas, Brasil)?  

E-Print Network [OSTI]

A cidade, um foco de diversidade agrícola no Rio Negro (Amazonas, Brasil)? The urban area, a center pour le Développement. Unité de Recherche 200, Brasília, Brasil (laura.emperaire@uol.com.br). II;A cidade, um foco de diversidade agrícola no Rio Negro (Amazonas, Brasil)? 196 INTRODU��O O

Paris-Sud XI, Université de

57

U.N. Security Council Issues Condemnation of Syria Attack  

E-Print Network [OSTI]

that might repeat the NATO military intervention in Libya, and despite strong statements, the West has

58

SPACEWAR WIRE MILITARY SPACE  

E-Print Network [OSTI]

arrest officer from Azerbaijan over brutal murder NATO chief hopes Putin will attend bloc's June summit

59

Arguing for Decisions: A Qualitative Model of Decision Making  

E-Print Network [OSTI]

Universidad Simon Bol var Aptdo. 89000, Caracas 1080-A Venezuela Hector Ge ner Dpto. de Computacion Universidad Simon Bol var Aptdo. 89000, Caracas 1080-A Venezuela Abstract We develop a qualitative model

Bonet, Blai

60

Learning sorting and decision trees with POMDPs Departamento de Computacion  

E-Print Network [OSTI]

Simon Bol var Aptdo. 89000, Caracas 1080-A Venezuela bonet@usb.ve Hector Ge ner Departamento de Computacion Universidad Simon Bol var Aptdo. 89000, Caracas 1080-A Venezuela hector@usb.ve Abstract pomdps

Bonet, Blai

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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

153M.F. Pereira and O. Shulika (eds.), Terahertz and Mid Infrared Radiation: Detection of Explosives and CBRN (Using Terahertz), NATO Science for Peace  

E-Print Network [OSTI]

), thermoelectrically cooled (TEC) and room temperature operated quantum cascade lasers (QCLs) for the detection process analysis will be reported. These sensors employ a 2f wavelength modulation (WM) technique based and sub ppbv concentration levels. The merits of QEPAS include an ultra-compact, rugged sensing module

62

Curriculum vitae et studiorum di Alessandro LANGUASCO Dati anagrafici: nome: LANGUASCO ALESSANDRO, nato il 23/12/1966 ad Imperia (IM), Italia,  

E-Print Network [OSTI]

) organizzato dalle Universit`a di Bordeaux (Francia), Parigi Sud (Parigi 11, Francia), Leiden (Paesi Bassi

Languasco, Alessandro

63

Enhancing Pilot Performance with a SymBodic Walter Karlen*, Member, IEEE, Sylvain Cardin, Daniel Thalmann, Dario Floreano, Senior Member, IEEE  

E-Print Network [OSTI]

]. The project aims to prove the concept of flying over long distances with renewable energies only. Until now, BC V6T 1Z4, Canada; *Corresponding author, e-mail: walter.karlen@ieee.org D. Floreano

Floreano, Dario

64

Infinite calculus and Types ? Alessandro Berarducci  

E-Print Network [OSTI]

and functional programming'' held in Torino, ? Partly supported by ESPRIT BRA 7232 GENTZEN and by NATO Grant

Torino, Università di

65

Automatic Reductions from PH into STRIPS or How to Generate Short Problems with Very Long Solutions  

E-Print Network [OSTI]

Aldo Porco Departamento de Computaci´on Universidad Sim´on Bol´ivar Caracas, Venezuela aldo@gia.usb.ve Alejandro Machado Departamento de Computaci´on Universidad Sim´on Bol´ivar Caracas, Venezuela alejandro@gia.usb.ve Blai Bonet Departamento de Computaci´on Universidad Sim´on Bol´ivar Caracas, Venezuela bonet

Bonet, Blai

66

Automatic Polytime Reductions of NP Problems into a Fragment of STRIPS  

E-Print Network [OSTI]

Computaci´on Universidad Sim´on Bol´ivar Caracas, Venezuela aldo@gia.usb.ve Alejandro Machado Departamento de Computaci´on Universidad Sim´on Bol´ivar Caracas, Venezuela alejandro@gia.usb.ve Blai Bonet Departamento de Computaci´on Universidad Sim´on Bol´ivar Caracas, Venezuela bonet@ldc.usb.ve Abstract We

Bonet, Blai

67

Depto. Computacin y T. I. Universidad Simn Bolvar  

E-Print Network [OSTI]

Depto. Computación y T. I. Universidad Simón Bolívar Caracas, Venezuela Prof. Yudith Cardinale, Ph Yudith Cardinale, PhD Universidad Simón Bolívar Caracas, Venezuela Octobre 2009 #12;Depto. Computación y T. I. Universidad Simón Bolívar Caracas, Venezuela Prof. Yudith Cardinale, PhD Université de Paris

Cardinale Villarreal, Yudith C.

68

alimentos na universidade: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

M. C. 9 PANTONE 201 PANTONE black tiro Universidad Physics Websites Summary: en Ciencia de los Alimentos y Nutricin Valle de Sartenejas, Universidad Simn Bol-var...

69

Improved AST's Based on Real World FCV Data  

Broader source: Energy.gov (indexed) [DOE]

DEGRADATION MODES Components @ BOL Bus field operation Existing AST's Stack testing Cell testing Microscopy Ex-situ techniques Mechanical decay Chemical decay Carbon corrosion...

70

Late Quaternary climate change from delta 13 O records of multiple species of planktonic foraminifera: High-resolution records from the Anoxic Cariaco Basin, Venezuela  

E-Print Network [OSTI]

the Lake Valencia Basin, Venezuela, Ecology, 66, 1279-1295,1954. waters of eastern Venezuela, Bol. Inst. Oceanogr.Los foraminiferos de Venezuela (resumen), Acta Geol. Hisp. ,

Lin, Hui-Ling; Peterson, Larry C; Overpeck, Jonathan T; Trumbore, Susan E; Murray, David W

1997-01-01T23:59:59.000Z

71

514 ... Nomenclature *Printed with permission from Taxon, the International Journal of Taxonomy,  

E-Print Network [OSTI]

, Universidad Simón Bolívar Apartado 89000 Sartenejas, Baruta, Edo. Miranda, Venezuela 6 CABI­Europe, CAB

72

Principe de Curie et application  

E-Print Network [OSTI]

symétries · Flambage /mm ? · Hydrodynamique · Double ballon RRc Figures de Chladni Métastabilité

Paris-Sud 11, Université de

73

Field demonstration of aviation turbine fuel MIL-T-83133C, grade JP-8 (NATO code F-34) at Fort Bliss, TX. Interim report 1 Feb 89-31 Jul 90  

SciTech Connect (OSTI)

A JP-8 fuel demonstration was initiated at Ft. Bliss, TX, to demonstrate the impact of using aviation turbine fuel MIL-T-83133C, grade JP-8 in all military diesel fuel-consuming ground vehicles and equipment. Three major organizations, one ordnance battalion and two activities with a total of 2807 vehicles/equipment (V/E), were identified as participants in the demonstration program, which is authorized to continue through 30 September 1991. No fuel storage tank or V/E fuel cells were drained and flushed prior to introduction of JP-8 fuel. This procedure resulted in a commingling of JP-8 fuel with existing diesel fuel. As of 31 July 1990 approximately 4,700,000 gallons of JP-8 fuel had been dispensed to user units at Ft. Bliss and at Ft. Irwin National Training Center (NTC) in California. Three areas of concern arose from the beginning of the program: (1) plugging of fuel filters, (2) loss of power, and (3) overheating. The use of JP-8 fuel did not cause or exacerbate any V/E fuel filter plugging. Where power loss was apparent, generally it was commensurate with the difference in heating values between JP-8 and diesel fuel. The V/E at Ft. Bliss operated satisfactorily with the JP-8 fuel with no alterations, mechanical or otherwise, having to be made to any engines or fuel systems. There were no major differences in fuel procurement costs, V/E fuel consumption, AOAP-directed oil changes, and fuel-wetted component replacements.

Butler, W.E.; Alvarez, R.A.; Yost, D.M.; Westbrook, S.R.; Buckingham, J.P.

1990-12-01T23:59:59.000Z

74

Automatic Derivation of Memoryless Policies and Finite-State Controllers Using Classical Planners  

E-Print Network [OSTI]

Blai Bonet Universidad Sim´on Bol´ivar Caracas, Venezuela bonet@ldc.usb.ve H´ector Palacios Universidad Sim´on Bol´ivar Caracas, Venezuela hlp@ldc.usb.ve H´ector Geffner ICREA & Univ. Pompeu Fabra Barcelona

Geffner, Hector

75

Automatic Derivation of Finite-State Machines for Behavior Control Universidad Simon Bolivar  

E-Print Network [OSTI]

´on Bol´ivar Caracas, Venezuela bonet@ldc.usb.ve H´ector Palacios Universidad Sim´on Bol´ivar Caracas, Venezuela hlp@ldc.usb.ve H´ector Geffner ICREA & Universitat Pompeu Fabra Barcelona, SPAIN hector

Bonet, Blai

76

Learning sorting and decision trees with POMDPs Departamento de Computaci'on  

E-Print Network [OSTI]

Sim'on Bol'ivar Aptdo. 89000, Caracas 1080­A Venezuela bonet@usb.ve H'ector Geffner Departamento de Computaci'on Universidad Sim'on Bol'ivar Aptdo. 89000, Caracas 1080­A Venezuela hector@usb.ve Abstract

Geffner, Hector

77

A Complete Algorithm for Generating Landmarks Departamento de Computacion  

E-Print Network [OSTI]

Sim´on Bol´ivar Caracas, Venezuela bonet@ldc.usb.ve Julio Castillo Departamento de Computaci´on Universidad Sim´on Bol´ivar Caracas, Venezuela juliocc@gmail.com Abstract A collection of landmarks

Bonet, Blai

78

Strade, Muri, Terra, Città, Mare. Sud Italia e mediterraneità postmoderna nel cinema inizio secolo  

E-Print Network [OSTI]

alcune riflessioni di Albert Camus, Cassano sottolinea anchedi cui parla Albert Camus – citato da Cassano – riferendosidel soggetto. Albert Camus ricorda: “Io sono nato povero

Ciccotti, Eusebio

2010-01-01T23:59:59.000Z

79

Updated 3-12 Michael R. Gutermuth  

E-Print Network [OSTI]

shipbuilding and weapon systems programs. He has developed innovative acquisition strategies for Program Executive Offices, ensuring effective and efficient program execution, and has directed NATO programs

80

TwitInfo: Aggregating and Visualizing Microblogs  

E-Print Network [OSTI]

traveled to the ASEAN conference and to NATO to work on issues in those parts of the world. He then spent

Pratt, Vaughan

Note: This page contains sample records for the topic "nato sym bol" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Four Papers by the Supernova Cosmology Project  

E-Print Network [OSTI]

Study Institute Thermonuclear Supernovae Conference,STUDY INSTITUTE THERMONUCLEAR SUPERNOVAE Aiguablava, SPAIN20-30, 1995 To appear-in Thermonuclear Supernovae (NATO ASI)

Perlmutter, S.; Deustua, S.; Gabi, S.; Goldhaber, G.

2008-01-01T23:59:59.000Z

82

Rapid Development of Realistic UAV Simulations; Snabb utveckling av realistisk UAV simulering.  

E-Print Network [OSTI]

?? Instrument Control Sweden (ICS) is a software company that develops NATO STANAG 4586 compatible ground station software for control of unmanned systems such as… (more)

Rugarn, Jonatan

2009-01-01T23:59:59.000Z

83

abb robots form: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

range of possible loads and configurations. NATO AS Series. bl. Fll Robotics and Artificial lntelhgence Edited by Sprmger-rlag Berlin Heidelberg 1984 In the future, new...

84

Sandia National Laboratories: Careers: Special Programs: Nonlinear...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

attending the institute may be available from NATO. Eligibility and requirements All - An interest in working with other researchers from around the world to explore major...

85

Sparse optimization for inverse problems in atmospheric modelling  

E-Print Network [OSTI]

Apr 13, 2015 ... In S.-E. Gryning and F. Schiermeier, editors, Air Pollution Modeling and Its Application. XI, volume 21 of NATO Challenges of Modern Society, ...

2015-04-13T23:59:59.000Z

86

François Antoine Valentin Riccoboni (1707-1772): Vita, attività teatrale, poetica di un attore-autore nell’Europa dei Lumi.  

E-Print Network [OSTI]

??François Antoine Valentin Riccoboni, attore nato a Mantova nel 1707, all’alba del nuovo secolo, debuttò a Parigi nel 1726. La sua attività artistica si sviluppò… (more)

DE LUCA, EMANUELE

2013-01-01T23:59:59.000Z

87

E-Print Network 3.0 - approach protezione di Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sciences 93 Il Gruppo Altran nato in Francia nel 1982 ed quotato alla borsa di Parigi. Offre consulenza alle principali imprese mondiali su: innovazione tecnologica e di...

88

Air Resources Laboratory Publications -FY 06  

E-Print Network [OSTI]

Meeting on Air Pollution Modelling and its Application, May 15-19, Leipzig, Germany. NATO/CCMS, 58 in continental air masses. Chapter 14 in: Dynamics of Mercury Pollution on Regional and Global Scales. N. Pirrone Pollution Modelling and its Application, May 15-19, Leipzig, Germany. NATO/CCMS, 60-61 (2006). Bullock, O

89

JOURNAL DE PHYSIQUEIV Colloque C4, suppl6ment au Journal de Physique III,Volume 5, mai 1995  

E-Print Network [OSTI]

Makes a Useable New Energetic Material? A.J. Sanderson NATO Insensitive Munitions Znfomtion Centre,HQ NATO, 1110 Bruxelles, Belgique ABSTRACT. In the last 50 years, very many new energetic compounds have NIMTC member nations, to study what it is that makes a new energetic material useable. Issues that were

Paris-Sud XI, Université de

90

Supplement 12, Authors: A To Z  

E-Print Network [OSTI]

Book of Fur Farming. Every Day Reference Guide for All Ranchers. Milwaukee, Wisconsin. Bol. Funda??o Gon?alo Moniz, Bahia.?Boletim da Funda??o Gon?alo Moniz. Bahia, Brasil. Bol. Mus. Paraense Emilio Goeldi.?Boletim do Museu Paraense Emilio Goeldi... Pu- bli?e avec le Concours du Centre National de la Recherche Scientifique. Paris. Manadsblad Tidskr. Skand. Kreatursfors?rings- bol.?Manadsblad. Tidskrift f?r Skandinaviska Kreaturesf?rs?kringsbolaget. Och F?rs?krings- bolaget f?r Smittsamma...

Doss, Mildred A.; Humphrey, Judith M.; Segal, Dorothy B.

1962-01-01T23:59:59.000Z

91

Conic approach to quantum graph parameters using linear ...  

E-Print Network [OSTI]

Jul 10, 2014 ... that are invariant under action of the permutation group Sym(t) (consisting of all permutations of [t] = {1,...,t}). ...... Private Communications, 2013.

2014-07-10T23:59:59.000Z

92

Exploiting non-traditional parallelization for application performance and energy efficiency in parallel systems /  

E-Print Network [OSTI]

Symposium on Computer Architecture, July 2001. [ZTC07] W.Sym- posium on Computer Architecture, June 2006. [CSK + 99]symposium on Computer Architecture, May 1999. [CSP04] Kihwan

Kamruzzaman, Md

2013-01-01T23:59:59.000Z

93

In Defense of Translating and Computing: From the Tang Code to Biographical Databases  

E-Print Network [OSTI]

Peter K. Bol (Charles H. Carswell Professor of East Asian Languages & Civilizations, and Director, Center for Geographic Analysis, Harvard University) delivered the inaugural lecture in honor of the late KU East Asian ...

Bol, Peter

2009-05-13T23:59:59.000Z

94

Late Quaternary climate change from delta 13 O records of multiple species of planktonic foraminifera: High-resolution records from the Anoxic Cariaco Basin, Venezuela  

E-Print Network [OSTI]

252, 149-158. , 1954. waters of eastern Venezuela, Bol.C. Urey, Revised carbonate-water isotopic temperature scale,Atlantic-Mediterranean water H. -L. Lin, Institute of Marine

Lin, Hui-Ling; Peterson, Larry C; Overpeck, Jonathan T; Trumbore, Susan E; Murray, David W

1997-01-01T23:59:59.000Z

95

Joint sets that enhance production from Middle and  

E-Print Network [OSTI]

Bolívar, Caracas, Venezuela; present address: Intevep, S.A., Apar- tado Postal 76343, Caracas 1070A, Venezuela Redescal Uzcátegui is a professor of structural geology at the Universidad Simón Bolívar and an I Venezuela, S.A. (PDVSA)-Intevep. He received his B.A. degree in geology at the Universidad Central de

Engelder, Terry

96

BIVARIATE KNOP-SAHI AND MACDONALD POLYNOMIALS RELATED TO q-ULTRASPHERICAL FUNCTIONS  

E-Print Network [OSTI]

BIVARIATE KNOP-SAHI AND MACDONALD POLYNOMIALS RELATED TO q-ULTRASPHERICAL FUNCTIONS Jennifer Morse-ultraspherical polynomials of Askey and Ismail, the two variable symmetric and non-symmetric Macdonald polynomials^omes en deux variables de Macdonald non-sym´etriques et sym´etriques, et les polyn^omes en deux variables

Morse, Jennifer

97

Safe havens in Syria : missions and requirements for an air campaign  

E-Print Network [OSTI]

What if the United States had led its NATO allies to intervene in Syria's civil war in the midst of calls for humanitarian intervention in mid-2012? Despite the importance of this question for the study and evaluation of ...

Haggerty, Brian Thomas

2014-01-01T23:59:59.000Z

98

Supernovae. Part I: The events  

E-Print Network [OSTI]

Barkat, Z. , 1977, in Supernovae, edited by D. N. Schramm {Sci. Rev. 27, Canal, Supernovae. R. A. , 1981f, in NATO81.C. B. , Ed. , 1974, Supernovae and Their Remnants,

Trimble, V

1982-01-01T23:59:59.000Z

99

Sciences and society  

ScienceCinema (OSTI)

J.Luns des Pays-Bas, ancien sécétaire général de NATO (OTAN=Organisation du traité de l'Atlantique Nord) parle du passé, présent et future de la défense européenne et des relations est et ouest

None

2011-04-25T23:59:59.000Z

100

Development and Integration Issues about Software Engineering, Systems  

E-Print Network [OSTI]

met 8 of the 17 Level 3 Goals Peer Review Software Product Engineering ISO 9001 since 1993 NATO Secret Implementation of Action Plan (Process Def.) Winter 94 Pilot Projects 1995 SoftwareSoftware Process

Laporte, Claude Y.

Note: This page contains sample records for the topic "nato sym bol" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

30 January 2012 China puts space-age seal on African role  

E-Print Network [OSTI]

and Libya. But Europeans, who contribute the largest part of AU project finance, appeared comprehensively in Ivory Coast and the Nato-backed rebellion in Libya split the continent, neither the South African

102

UNIVERSIT DEGLI STUDI DI PADOVA Ufficio Stampa  

E-Print Network [OSTI]

internazionale di studiosi di robotica, è nato nel 1986 come maggior evento che si occupa di questo argomento: da nella maggior misura possibile. L'incontro è organizzato dallo IAS-Lab (laboratorio di robotica) del

Cesare, Bernardo

103

acceptance workshop proceedings: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

by N. Nickel and E. Terukov, NATO Science Series II, Vol. 194, p. 125-32 (2005). HYDROGEN DONORS IN ZINC OXIDE M.D. McCluskey and S.J. Jokela Department of Physics, Washington...

104

Vacancy no. 1//2014 Page 1 of 5 VACANCY ANNOUNCEMENT  

E-Print Network [OSTI]

Vacancy no. 1//2014 Page 1 of 5 VACANCY ANNOUNCEMENT Vacancy Number 1/2014 Post Title: Scientist toward systems, physical processes, and modelling. The present http://www.CMRE.nato.in t #12;Vacancy no

Kurapov, Alexander

105

Un aspetto di Alfieri politico tra Francia e Italia. Dalla Tirannide al Parigi sbastigliato.  

E-Print Network [OSTI]

??Il presente studio è nato dall’interesse ad approfondire la comprensione dell’ideologia politica di Alfieri affrontata precedentemente in una relazione seminariale sul rapporto dell’autore con la… (more)

BIAGIONI, RICCARDO

2013-01-01T23:59:59.000Z

106

Design Sensitivity Analysis: Overview and Review Daniel A. Tortorelli  

E-Print Network [OSTI]

mechanic and [2] for nuclear reactor design applications). Thus, the sensitivities offer an efficient means to structural optimization. For example see the books [3, 4, 5, 6, 7, 8, 9], the journal [10] and the NATO ASI

Michaleris, Panagiotis

107

Factors Affecting the Feasibility of a Warsaw Pact Invasion of Western Europe  

E-Print Network [OSTI]

and termination of such a conflict in Central Europe. The argument will be made that NATO would have been able to hold onto most of West Germany in the event of such an attack....

Williamson, Corbin

2008-05-16T23:59:59.000Z

108

CO2-Binding Organic Liquids Gas Capture with Polarity-Swing-Assisted Regeneration Full Technology Feasibility Study B1 - Solvent-based Systems  

SciTech Connect (OSTI)

PNNL, Fluor Corporation and Queens University (Kingston, ON) successfully completed a three year comprehensive study of the CO2BOL water-lean solvent platform with Polarity Swing Assisted Regeneration (PSAR). This study encompassed solvent synthesis, characterization, environmental toxicology, physical, thermodynamic and kinetic property measurements, Aspen Plus™ modeling and bench-scale testing of a candidate CO2BOL solvent molecule. Key Program Findings The key program findings are summarized as follows: • PSAR favorably reduced stripper duties and reboiler temperatures with little/no impact to absorption column • >90% CO2 capture was achievable at reasonable liquid-gas ratios in the absorber • High rich solvent viscosities (up to 600 cP) were successfully demonstrated in the bench-scale system. However, the projected impacts of high viscosity to capital cost and operational limits compromised the other levelized cost of electricity benefits. • Low thermal conductivity of organics significantly increased the required cross exchanger surface area, and potentially other heat exchange surfaces. • CO2BOL had low evaporative losses during bench-scale testing • There was no evidence of foaming during bench scale testing • Current CO2BOL formulation costs project to be $35/kg • Ecotoxicity (Water Daphnia) was comparable between CO2BOL and MEA (169.47 versus 103.63 mg/L) • Full dehydration of the flue gas was determined to not be economically feasible. However, modest refrigeration (13 MW for the 550 MW reference system) was determined to be potentially economically feasible, and still produce a water-lean condition for the CO2BOLs (5 wt% steady-state water loading). • CO2BOLs testing with 5 wt% water loading did not compromise anhydrous performance behavior, and showed actual enhancement of CO2 capture performance. • Mass transfer of CO2BOLs was not greatly impeded by viscosity • Facile separation of antisolvent from lean CO2BOL was demonstrated on the bench cart • No measurable solvent degradation was observed over 4 months of testing – even with 5 wt% water present

Heldebrant, David J

2014-08-31T23:59:59.000Z

109

The ChaMP Extended Stellar Survey (ChESS): Photometric and Spectroscopic Properties of Serendipitously Detected Stellar X-ray Sources  

E-Print Network [OSTI]

We present 348 X-ray emitting stars identified from correlating the Extended Chandra Multiwavelength Project (ChaMP), a serendipitous wide-area X-ray survey, with the Sloan Digital Sky Survey (SDSS). We use morphological star/galaxy separation, an SDSS quasar catalog, an optical color-magnitude cut, and X-ray data quality tests to create our catalog, the ChaMP Extended Stellar Survey (ChESS), from a sample of 2121 matched ChaMP/SDSS sources. Our cuts retain 92% of the spectroscopically confirmed stars while excluding 99.6% of the 684 spectoscopically confirmed extragalactic sources. Fewer than 3% of the sources in our final catalog are previously identified stellar X-ray emitters; we expect ~10% of the catalog is composed by giants, and identify seven giant stars and three cataclysmic variables. We derive distances, X-ray and bolometric luminosities for these stars, revealing that this catalog fills the gap between the nearby stars identified by the ROSAT All-Sky Survey and the more distant stars detected in deep Chandra and XMM-Newton surveys. For 36 newly identified X-ray emitting M stars we calculate L_(Halpha)/L_(bol). L_(H\\alpha)/L_(bol) and L_(X)/L_(bol) are linearly related below L_(X)/L_(bol) ~ 3 x 10^(-4), while L_(Halpha)/L_(bol) appears to turn over at larger L_(X)/L_(bol) values. Stars with reliable SDSS photometry have an ~0.1 mag blue excess in (u-g), likely due to increased chromospheric continuum emission. Photometric metallicity estimates suggest the sample is split between the young and old disk populations of the Galaxy; the lowest activity sources belong to the old disk population, a clear signature of the decay of magnetic activity with age. Future papers will present analyses of source variability and comparisons of this catalog to models of stellar activity in the Galactic disk.

K. R. Covey; M. A. Agueros; P. J. Green; D. Haggard; W. A. Barkhouse; J. Drake; N. Evans; V. Kashyap; D. -W. Kim; A. Mossman; D. O. Pease; J. D. Silverman

2008-05-16T23:59:59.000Z

110

The effect of a finite mass reservoir on the collapse of spherical isothermal clouds and the evolution of protostellar accretion  

E-Print Network [OSTI]

Motivated by recent observations which detect an outer boundary for starless cores, and evidence for time-dependent mass accretion in the Class 0 and Class I protostellar phases, we reexamine the case of spherical isothermal collapse in the case of a finite mass reservoir. The presence of a core boundary results in the generation of an inward propagating rarefaction wave. This steepens the gas density profile from r^{-2} to r^{-3} or steeper. After a protostar forms, the mass accretion rate \\dot{M} evolves through three distinct phases: (1) an early phase of decline in \\dot{M}, which is a non-self-similar effect due to spatially nonuniform infall in the prestellar phase; (2) for large cores, an intermediate phase of near-constant \\dot{M} from the infall of the outer part of the self-similar density profile; (3) a late phase of rapid decline in \\dot{M} when accretion occurs from the region affected by the inward propagating rarefaction wave. Our model clouds of small to intermediate size make a direct transition from phase (1) to phase (3) above. Both the first and second phase are characterized by a temporally increasing bolometric luminosity L_bol, while L_bol is decreasing in the third (final) phase. We identify the period of temporally increasing L_bol with the Class 0 phase, and the later period of terminal accretion and decreasing L_bol with the Class I phase. The peak in L_bol corresponds to the evolutionary time when 50% \\pm 10% of the cloud mass has been accreted by the protostar. This is in agreement with the classification scheme proposed by Andre et al. (1993). We show how our results can be used to explain tracks of envelope mass M_env versus L_bol for protostars in Taurus and Ophiuchus. We also develop an analytic formalism which reproduces the protostellar accretion rate.

E. I. Vorobyov; Shantanu Basu

2005-04-03T23:59:59.000Z

111

Supplement 18, Part 1, Authors: A To Z  

E-Print Network [OSTI]

-verpiensia. [Wa.(410.9 Sol93)j Advances Chemotherapy.? Advances in Chemotherapy. New York; London. [Wa.(RM 260 .A3)] African Wild Life.? African Wild Life. Johannesburg. [W*.] Aktual. Voprosy Gigien. i Epidemiol. Donbass.-- Aktual'nye Voprosy Gigieny i... la Real Sociedad Espa?ola de Historia Natural, Sec- ci?n Biologica. Madrid. [W3?. (4/2.9 Sol8)] Bol. Soc. Cearense Agron., Fortaleza.? Boletim da Soc-iedade Cearense de Agronomia. Fortaleza, Cear?, Brasil. [W .(9.2 S0I4B)] Bol. Soc. Estud...

Segal, Dorothy B.; Humphrey, Judith M.; Edwards, Shirley J.; Kirby, Margie D.

1970-01-01T23:59:59.000Z

112

Radiation of a circulating quark in strongly coupled N = 4 super Yang-Mills theory  

E-Print Network [OSTI]

The energy density and angular distribution of power radiated by a quark undergoing circular motion in strongly coupled N? = ?4 supersymmetric Yang?Mills (SYM) theory is computed using gauge?gravity duality. The results ...

Athanasiou, Christiana

113

Toward an analog neural substrate for production systems Patrick Simen (psimen@princeton.edu), Marieke Van Vugt (mkvan@princeton.edu)  

E-Print Network [OSTI]

Toward an analog neural substrate for production systems Patrick Simen (psimen existing work showing that critical features of sym- bolic production systems can be implemented oscillators. Keywords: Production system; neural network; diffusion model; random walk; reinforcement learning

van Vugt, Marieke

114

SYLLABUS--GEOGRAPHY (GEOG)-455 APPLIED CLIMATOLOGY  

E-Print Network [OSTI]

SYLLABUS--GEOGRAPHY (GEOG)-455 APPLIED CLIMATOLOGY Spring 2006 Time: T-R 12:30-1:45 p.m. (BOL B95-455-001-lec@uwm.edu Textbooks: Thompson-Perry, Applied Climatology: principles and practice, (1997, graduate students will prepare a 10 page (2500 word minimum) paper on a project using applied climatology

Saldin, Dilano

115

SYLLABUS--GEOGRAPHY 310 GENERAL CLIMATOLOGY  

E-Print Network [OSTI]

SYLLABUS--GEOGRAPHY 310 GENERAL CLIMATOLOGY Fall 2009 Time: T-R 11:00-12:15 p.m. (BOL B95 and SAB only Class Reflector: geog-310@uwm.edu Textbooks: Rohli & Vega, Climatology (1 edition, 2008)st Map Climatology 2 TENTATIVE LECTURE SCHEDULE AND READINGS Rohli & Vega Chapters Sept. 3-R--Introduction and course

Saldin, Dilano

116

Application of burnable absorbers in an accelerator driven system Jan Wallenius, Kamil Tucek, Johan Carlsson, Waclaw Gudowski  

E-Print Network [OSTI]

Carlsson, Waclaw Gudowski Department of Nuclear & Reactor Physics Royal Institute of Technology 100 44 to achieve smallest possible power peakings at a BOL sub-criticality level of 0.97. Detailed Monte Carlo to corresponding values in BA free cores, BA introduction diminishes reactivity losses in TRU fuelled sub-critical

117

Conselho de Ministros abre porta das salas de aulas aos bolseiros  

E-Print Network [OSTI]

permite que os bolseiros de investigação lecionem, ape- sar de diversas limitações impostas pelo Governo O Governo aprovou a alteração ao Estatuto do Bolseiro de Investiga- ção que permite que todos os bol- seiros mesmo a pedir "diversos pareceres jurídicos" sobre os ajus- tes promovidos pelo Governo. Um dos

Instituto de Sistemas e Robotica

118

What is 4-H? (Spanish)  

E-Print Network [OSTI]

Nutrici?n y Alimentaci?n para J?venes. En este programa, los grupos juveniles reciben instrucci?n sobre los alimentos y las buenas pr?cticas de nutrici?n usando recursos especiales de educaci?n. Los Ni?os Tr?bol de 4-H Este programa est? afiliado al...

Howard, Jeff W.

2005-05-10T23:59:59.000Z

119

Water skin anomalies: density, elasticity, hydrophobicity, thermal stability, interface repulsivity, etc  

E-Print Network [OSTI]

Molecular undercoordination induced O:H-O bond relaxation and dual polarization dictates the supersolid behavior of water skins interacting with other substances such as flowing in nanochannels, dancing of water droplets, floating of insects. The BOLS-NEP notion unifies the Wenzel-Cassie-Baxter models and explains controllable transition between hydrophobicity and hydrophilicity.

Chang Q. Sun

2015-02-26T23:59:59.000Z

120

Reanudaci'on de Ejecuci'on de Procesos en Metasistemas \\Lambda Yudith Cardinale and Emilio Hern'andez  

E-Print Network [OSTI]

Sim'on Bol'ivar (como apoyo al grupo de investigaci'on GID­25) #12; 1 INTRODUCCI ' ON El acceso operaci'on distribuido es el hecho de que un metasistema est'a conformado por sistemas de computaci

Cardinale Villarreal, Yudith C.

Note: This page contains sample records for the topic "nato sym bol" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Universidad Simn Bolvar, Edif. Energtica, Planta Baja. Valle de Sartenejas, Baruta, Caracas, Edo. Miranda, Venezuela, 89000 Telef.: 58 212 906-3708 / 3709 / 3710 / 3711 Fax: 58 212 906-3712 www.ulab.usb.ve  

E-Print Network [OSTI]

. Miranda, Venezuela, 89000 Telef.: 58 212 906-3708 / 3709 / 3710 / 3711 Fax: 58 212 906-3712 www siguiente: Universidad Simón Bolívar Valle de Sartenejas Baruta; Edo. Miranda, 1080 Venezuela Cód. Doc.: UL

Vásquez, Carlos

122

UNIVERSIDAD SIMON BOLIVAR VICERRECTORADO ADMINISTRATIVO  

E-Print Network [OSTI]

emergencia, arquitectura y obras civiles Coordinadora Prof. Myriam Araujo Sartenejas, Mayo 2012 #12 emergencia, arquitectura y obras civiles N°CD/2012-046-2-2 Objeto del Concurso Cerrado: El objeto del, Sistema contra incendios y emergencia, arquitectura y obras civiles, de la Universidad Simón Bolívar, Sede

Vásquez, Carlos

123

On the Rural Postman Problem: Tight Bounds and Efficient Heuristics Based on a New Formulation  

E-Print Network [OSTI]

Bolívar University Apartado 89000, Baruta, Venezuela e-mail: meza@ldc.usb.ve Robert Garfinkel School University Apartado 89000, Baruta, Venezuela e-mail: meza@ldc.usb.ve Abstract In this work we focus on a new

Meza, Oscar J.

124

Future peace operations: Lessons from Bosnia. Final report  

SciTech Connect (OSTI)

The end of the Bi-polar world has increased the requirement for and scope of UN peace operations. This paper examines the current situation in Bosnia from an Operational Command and Control perspective. It points out the shortfalls of force structure, clear direction on both the strategic/operational level and the UN`s inability to coordinate their and NATO`s efforts. It will also discuss the need and framework for `robust` peace operations. It concludes with an examination of options for a command and control structure for future UN peace operations.

Godlewski, J.S.

1995-05-16T23:59:59.000Z

125

Jean Cermakian, Professeur associ (gographie), Universit du Qubec Trois-Rivires (UQTR)  

E-Print Network [OSTI]

://www.un.org/fr/ : portail de l'Organisation des Nations Unies · https://www.cia.gov/library/publications/the-world-factbook/index.html : Annuaire mondial de la CIA · http://www.nato.int/cps/fr/natolive/index.htm: site de l'OTAN · http

Huber, Patrick

126

INSTITUTE OF PHYSICS PUBLISHING JOURNAL OF OPTICS A: PURE AND APPLIED OPTICS The plurality of optical singularities  

E-Print Network [OSTI]

INSTITUTE OF PHYSICS PUBLISHING JOURNAL OF OPTICS A: PURE AND APPLIED OPTICS EDITORIAL The plurality of optical singularities Guest Editors Michael Berry (Co-Director of NATO ARW) H H Wills Physics, Kiev, Ukraine This collection of papers arose from an Advanced Research Workshop on Singular Optics

Berry, Michael Victor

127

L'opration Althea en Bosnie-Herzgovine et la gestion europenne du post-conflit  

E-Print Network [OSTI]

Operation Althea in Bosnia-and-Herzegovina: Post-conflict Management the EU Way Abstract On December 2, 2004, the European Union took over from NATO the main peacekeeping forces that had been deployed in Bosnia of post-conflict management in Bosnia. Against this background, Althea provides a fruitful locus to assess

Boyer, Edmond

128

26 Casa Futura gennaio/febbraio 2008 La "Casa Futura"  

E-Print Network [OSTI]

architetture di computer, le reti mobili ad hoc, la progettazione di interfacce; · le aree della robotica e robotica (AIRLab) ­ www.airlab.elet.polimi.it ­ che svolge le sue attività negli ambiti dell'intelligenza artificiale, della robotica e della visione artificiale. Il laboratorio è nato nel 1971 su iniziativa del prof

Gatti, Nicola

129

Home -Yahoo! -My Yahoo! -News Alerts -Help FREE Web-enabled Cell Phone  

E-Print Network [OSTI]

radioactivity over that period. Traces of plutonium in depleted uranium (DU) weapons used by NATO (news - web req'd) (Mar 30, 2001) · Ill Uranium Miners Left Waiting as Payments for Exposure Lapse - NY Times synthetically from uranium. Plutonium has a half- life of 24,000 years, which means it loses only half its

Savrasov, Sergej Y.

130

Cornelis Zwaan (1928 1999) All Publications Zwaan, C.: 1959, "Curves of growth for a large sunspot", Bull. Astronom. Institutes Netherlands  

E-Print Network [OSTI]

sunspot", Bull. Astronom. Institutes Netherlands 14, 288­298 Zwaan, C.: 1960, "Note on partition functions and ultraviolet region", Bull. Astronom. Institutes Netherlands 16, 225­233 Zwaan, C.: 1965a, "On the influence Physics, Pro- ceedings NATO Advanced Study Institute Lagonissi, Interscience Publishers, Page Bros

Rutten, Rob

131

Front 11.06.12 / Nr. 133 / Seite 1 / Teil 01 BRSEN UND MRKTE  

E-Print Network [OSTI]

Menschenmögliche getan, um Russland zu einem stabilen Staat zu machen. Von Stephan Bierling Der Westen hat Putin Sowjetunion systematisch überging. Der Westen sei selber schuld, dass es ihm Putin nun mit gleicher Münze Putin wohl nicht auf der Krim eingefallen. Parallel bot die Nato Russland Sonderbeziehungen an, die sich

Schubart, Christoph

132

Isobaric incompressibility of the isospin asymmetric nuclear matter  

E-Print Network [OSTI]

The isospin dependence of the saturation properties of asymmetric nuclear matter, particularly the incompressibility $K_\\infty (X) = K_\\infty + K_\\tau X^2 + O(X^4)$ at saturation density is systematically studied using density dependent M3Y interaction. The $K_\\tau$ characterizes the isospin dependence of the incompressibility at saturation density $\\rho_0$. The approximate expression $K_{asy} \\approx K_{sym}-6L$ is often used for $K_\\tau$ where $L$ and $K_{sym}$ represent, respectively, the slope and curvature parameters of the symmetry energy at $\\rho_0$. It can be expressed accurately as $K_\\tau=K_{sym}-6L-\\frac{Q_0}{K_\\infty}L$ where $Q_0$ is the third-order derivative parameter of symmetric nuclear matter at $\\rho_0$. The results of this addendum to Phys. Rev. C 80, 011305(R) (2009) indicate that the $Q_0$ contribution to $K_\\tau$ is not insignificant.

D. N. Basu; P. Roy Chowdhury; C. Samanta

2009-11-09T23:59:59.000Z

133

Constraining the symmetry energy from the neutron skin thickness of Tin isotopes  

E-Print Network [OSTI]

We show in the Skyrme-Hartree-Fock approach that unambiguous correlations exist between observables of finite nuclei and nuclear matter properties. Using this correlation analysis to existing data on the neutron skin thickness of Sn isotopes, we find important constraints on the value E_{sym}(rho_0) and density slope L of the nuclear symmetry energy at saturation density. Combining these constraints with those from recent analyses of isospin diffusion and double neutron/proton ratio in heavy ion collisions leads to a value of L=58\\pm 18 MeV approximately independent of E_{sym}(\\rho_0).

Lie-Wen Chen; Che Ming Ko; Jun Xu; Bao-An Li

2011-03-24T23:59:59.000Z

134

The White Dwarf Luminosity Function from SDSS Imaging Data  

E-Print Network [OSTI]

A sample of white dwarfs is selected from SDSS DR3 imaging data using their reduced proper motions, based on improved proper motions from SDSS plus USNO-B combined data. Numerous SDSS and followup spectra (Kilic et al. 2005) are used to quantify completeness and contamination of the sample; kinematic models are used to understand and correct for velocity-dependent selection biases. A luminosity function is constructed covering the range 7 < M_bol < 16, and its sensitivity to various assumptions and selection limits is discussed. The white dwarf luminosity function based on 6000 stars is remarkably smooth, and rises nearly monotonically to M_bol = 15.3. It then drops abruptly, although the small number of low-luminosity stars in the sample and their unknown atmospheric composition prevent quantitative conclusions about this decline. Stars are identified that may have high tangential velocities, and a preliminary luminosity function is constructed for them.

Hugh C. Harris; Jeffrey A. Munn; Mukremin Kilic; James Liebert; Kurtis A. Williams; Ted von Hippel; Stephen E. Levine; David G. Monet; Daniel J. Eisenstein; S. J. Kleinman; T. S. Metcalfe; Atsuko Nitta; D. E. Winget; J. Brinkmann; Masataka Fukugita; G. R. Knapp; Robert H. Lupton; J. Allyn Smith; Donald P. Schneider

2005-10-29T23:59:59.000Z

135

PANTONE 295 PANTONE black tiro Universidad  

E-Print Network [OSTI]

Mecánica y civil Valle de Sartenejas, Universidad Simón Bolívar Edificio de MEU, 3er. Piso, Ofic. 332 Teléfono: (0212) 906 4056 Fax: (0212) 906 4057 Correo electrónico: post-mec@usb.ve http://www.postgrado.usb.ve/programas/ingenieria/ mecanica_civil/index.html Apartado 89000. Caracas 1080 - Venezuela Requisitos de egreso El estudiante

Vásquez, Carlos

136

Housing Diversity and Consolidation in Low-Income Colonias: Patterns of House Form and Household Arrangements in Colonias of the US-Mexico Border  

E-Print Network [OSTI]

Housing Diversity and Consolidation in Low-Income Colonias: Patterns of House Form and Household Arrangements in Colonias of the US-Mexico Border. (August 2009) Carlos Alberto Reimers-Arias, B.Arch., Universidad Sim?n Bol?var; M.Arch., Mc... of DOCTOR OF PHILOSOPHY Approved by: Co-Chairs of Committee, Andrew D. Seidel Robin F. Abrams Committee Members, Marlynn L. May Robert B. Warden Head of Department, Glen T. Mills August 2009 Major Subject: Architecture iii ABSTRACT...

Reimers-Arias, Carlos Alberto

2010-10-12T23:59:59.000Z

137

The toxicity of different emulsions of toxaphene to cotton insects  

E-Print Network [OSTI]

. Summary of the cotton boll weevil toxicity tests ~ . LS 5. Analysis of cotton bolL weevil control data ob- tained in the laboratory and field teste ~ ~ ~ ~ ~ 20 4 ~ Summary of the cotton boll weevil toxicity test in the Laboratorye ~ ~ ~ ~ ~ ~ ~ ~ e... ~ ~ ~ ~ ~ ~ ~ ~ o ~ ~ e ~ ~ ~ ~ ~ ~ ~ ~ 21 6 Summary of the saltish caterpillar toxicity tests ~ ~ ~ eo ~ ~ ~ ~ ~ e( ~ ~ ~ ~ ~ ~ ee ~ ~ ~ ~ ~ ~ o ~ ~ ~ ~ ~ ~ ~ e ~ a ~ ~ ~ ~ ~ 22 6 ~ Vedian lethal dosage {KID) of the test materials as obtained fran the Laboratory...

Selby, James Winford

1952-01-01T23:59:59.000Z

138

Assessment of dynamic energy conversion systems for radioisotope heat sources  

SciTech Connect (OSTI)

The use of dynamic conversion systems to convert the heat generated in a 7500 W(t) 90 Sr radioisotopic heat source to electricity is examined. The systems studies were Stirling; Brayton Cycle; three organic Rankines (ORCs) (Barber-Nichols/ORMAT, Sundstrand, and TRW); and an organic Rankine plus thermoelectrics. The systems were ranked for a North Warning System mission using a Los Alamos Multiattribute Decision Theory code. Three different heat source designs were used: case I with a beginning of life (BOL) source temperature of 640 C, case II with a BOL source temperature of 745/sup 0/C, and case III with a BOL source temperature of 945/sup 0/C. The Stirling engine system was the top-ranked system of cases I and II, closely followed by the ORC systems in case I and ORC plus thermoelectrics in case II. The Brayton cycle system was top-ranked for case III, with the Stirling engine system a close second. The use of /sup 238/Pu in heat source sizes of 7500 W(t) was examined and found to be questionable because of cost and material availability and because of additional requirements for analysis of safeguards and critical mass.

Thayer, G.R.; Mangeng, C.A.

1985-06-01T23:59:59.000Z

139

CHANDRA X-RAY DETECTION OF THE ENIGMATIC FIELD STAR BP Psc  

SciTech Connect (OSTI)

BP Psc is a remarkable emission-line field star that is orbited by a dusty disk and drives a parsec-scale system of jets. We report the detection by the Chandra X-ray Observatory of a weak X-ray point source coincident with the centroids of optical/IR and submillimeter continuum emission at BP Psc. As the star's photosphere is obscured throughout the visible and near-infrared, the Chandra X-ray source likely represents the first detection of BP Psc itself. The X-rays most likely originate with magnetic activity at BP Psc and hence can be attributed either to a stellar corona or to star-disk interactions. The log of the ratio of X-ray to bolometric luminosity, log(L{sub X} /L{sub bol}), lies in the range -5.8 to -4.2. This is smaller than log(L{sub X} /L{sub bol}) ratios typical of low-mass, pre-main sequence stars, but is well within the log(L{sub X} /L{sub bol}) range observed for rapidly rotating (FK Com-type) G giant stars. Hence, the Chandra results favor an exotic model wherein the disk/jet system of BP Psc is the result of its very recently engulfing a companion star or a giant planet, as the primary star ascended the giant branch.

Kastner, Joel H.; Montez, Rodolfo [Center for Imaging Science, Rochester Institute of Technology, 54 Lomb Memorial Drive, Rochester, NY 14623 (United States); Rodriguez, David; Zuckerman, B.; Perrin, Marshall D. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Grosso, Nicolas [Observatoire astronomique de Strasbourg, Universite de Strasbourg, CNRS, UMR 7550, 11 rue de l'Universit, F-67000 Strasbourg (France); Forveille, Thierry [Laboratoire d'Astrophysique de Grenoble, Universite Joseph Fourier-CNRS, BP 53, 38041 Grenoble Cedex (France); Graham, James R., E-mail: jhk@cis.rit.ed [Astronomy Department, 601 Campbell Hall, University of California, Berkeley, CA 94720 (United States)

2010-08-10T23:59:59.000Z

140

Submm-bright X-ray absorbed QSOs at z~2: insights into the co-evolution of AGN and star-formation  

E-Print Network [OSTI]

We have assembled a sample of 5 X-ray-absorbed and submm-luminous type 1 QSOs at $z \\sim 2$ which are simultaneously growing their central black holes through accretion and forming stars copiously. We present here the analysis of their rest-frame UV to submm Spectral Energy Distributions (SEDs), including new Herschel data. Both AGN (direct and reprocessed) and Star Formation (SF) emission are needed to model their SEDs. From the SEDs and their UV-optical spectra we have estimated the masses of their black holes $M_{BH}\\sim 10^{9}-10^{10}\\,M_{\\odot}$, their intrinsic AGN bolometric luminosities $L_{BOL}\\sim(0.8 - 20)\\times 10^{13} L_{\\odot}$, Eddington ratios $L_{BOL}/L_{Edd}\\sim 0.1 - 1.1$ and bolometric corrections $L_{BOL}/L_{X,2-10}\\sim 30 - 500$. These values are common among optically and X-ray-selected type 1 QSOs (except for RX~J1249), except for the bolometric corrections, which are higher. These objects show very high far-infrared luminosities $L_{FIR}\\sim$ (2 - 8)$\\times10^{12}\\,M_{\\odot}$ and Star...

Khan-Ali, A; Page, M J; Stevens, J A; Mateos, S; Symeonidis, M; Orjales, J M Cao

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nato sym bol" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

EMBEDDED PROTOSTARS IN THE DUST, ICE, AND GAS IN TIME (DIGIT) HERSCHEL KEY PROGRAM: CONTINUUM SEDs, AND AN INVENTORY OF CHARACTERISTIC FAR-INFRARED LINES FROM PACS SPECTROSCOPY  

SciTech Connect (OSTI)

We present 50-210 {mu}m spectral scans of 30 Class 0/I protostellar sources, obtained with Herschel-PACS, and 0.5-1000 {mu}m spectral energy distributions, as part of the Dust, Ice, and Gas in Time Key Program. Some sources exhibit up to 75 H{sub 2}O lines ranging in excitation energy from 100 to 2000 K, 12 transitions of OH, and CO rotational lines ranging from J = 14 {yields} 13 up to J = 40 {yields} 39. [O I] is detected in all but one source in the entire sample; among the sources with detectable [O I] are two very low luminosity objects. The mean 63/145 {mu}m [O I] flux ratio is 17.2 {+-} 9.2. The [O I] 63 {mu}m line correlates with L{sub bol}, but not with the time-averaged outflow rate derived from low-J CO maps. [C II] emission is in general not local to the source. The sample L{sub bol} increased by 1.25 (1.06) and T{sub bol} decreased to 0.96 (0.96) of mean (median) values with the inclusion of the Herschel data. Most CO rotational diagrams are characterized by two optically thin components ( = (0.70 {+-} 1.12) x 10{sup 49} total particles). N{sub CO} correlates strongly with L{sub bol}, but neither T{sub rot} nor N{sub CO}(warm)/N{sub CO}(hot) correlates with L{sub bol}, suggesting that the total excited gas is related to the current source luminosity, but that the excitation is primarily determined by the physics of the interaction (e.g., UV-heating/shocks). Rotational temperatures for H{sub 2}O ( = 194 +/- 85 K) and OH ( = 183 +/- 117 K) are generally lower than for CO, and much of the scatter in the observations about the best fit is attributed to differences in excitation conditions and optical depths among the detected lines.

Green, Joel D.; Evans, Neal J. II; Rascati, Michelle R. [Department of Astronomy, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712-1205 (United States); Jorgensen, Jes K.; Dionatos, Odysseas; Lindberg, Johan E. [Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen (Denmark); Herczeg, Gregory J. [Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871 (China); Kristensen, Lars E.; Yildiz, Umut A.; Van Kempen, Tim A. [Leiden Observatory, Leiden University, P.O. Box 9513, 2300-RA Leiden (Netherlands); Lee, Jeong-Eun [Department of Astronomy and Space Science, Kyung Hee University, Gyeonggi 446-701 (Korea, Republic of); Salyk, Colette [National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Meeus, Gwendolyn [Dpt. Fisica Teorica, Universidad Autonoma de Madrid, Campus Cantoblanco, E-28049 Madrid (Spain); Bouwman, Jeroen [Max Planck Institute for Astronomy, D-69117 Heidelberg (Germany); Visser, Ruud; Bergin, Edwin A. [Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109-1042 (United States); Van Dishoeck, Ewine F.; Karska, Agata; Fedele, Davide [Max-Planck Institute for Extraterrestrial Physics, Postfach 1312, D-85741 Garching (Germany); Dunham, Michael M., E-mail: joel@astro.as.utexas.edu [Department of Astronomy, Yale University, New Haven, CT 06511 (United States); Collaboration: DIGIT Team1

2013-06-20T23:59:59.000Z

142

Managing Space for Finite-State Verification Jianbin Tan, George S. Avrunin, Lori A. Clarke  

E-Print Network [OSTI]

(ZDDs), in two FSV tools, LTSA and FLAVERS. We describe an experiment showing that these two sym- bolic. Copyright 2006 ACM 1-59593-085-X/06/0005 ...$5.00. Keywords Finite-state verification, BDD, ZDD, LTSA, LTSA [14] and FLAVERS [12]. We describe how the systems to be verified are encoded as Boolean functions

Avrunin, George S.

143

sparse optimization with least-squares constraints  

E-Print Network [OSTI]

Jan 30, 2010 ... Many signal- and image-processing applications aim to approx- imate an object as a ...... used to identify the chemical composition of a material sample. There exist ... with additive noise. The results of these simulations are ...... [57] J. F. Sturm, Using SeDuMi 1.02, a Matlab toolbox for optimization over sym-.

E. van den Berg and M. P. Friedlander

2010-02-02T23:59:59.000Z

144

NORTHEASTERN NATURALIST2004 11(1):3340 THE DEMI-LICHENIZATION OF TRAMETES  

E-Print Network [OSTI]

to the mycobiont is glucose (Ahmadjian 1993). Algal sym- bionts secrete a variety of polyols. Two commonly of the basidiocarp. The results suggest that the epiphytic algae secrete the fixed carbon in a form that Trametes a casual relationship between T. versicolor and its epiphytic algal flora. INTRODUCTION The wood decaying

Toth, Charles

145

BGSU ASIAN POPULAR CULTURE SYMPOSIUM by Esther Clinton, Jeremy Wallach, and Kristen Rudisill  

E-Print Network [OSTI]

ethnomusicologist Paul D. Greene from Penn State. Dis- Bowling Green State University P O P U L A R C U LT U R E N E Scholars from around the country converged on Bowling Green's campus for the BGSU Asian Popular Culture Sym by the hospitality they encoun- tered and by the undeniable usefulness of the Bowling Green approach, with its

Moore, Paul A.

146

Constraints on neutron skin thickness in 208Pb and density-dependent symmetry energy  

E-Print Network [OSTI]

Accurate knowledge about the neutron skin thickness $\\Delta R_{np}$ in $^{208}$Pb has far-reaching implications for different communities of nuclear physics and astrophysics. Yet, the novel Lead Radius Experiment (PREX) did not yield stringent constraint on the $\\Delta R_{np}$ recently. We employ a more practicable strategy currently to probe the neutron skin thickness of $^{208}$Pb based on a high linear correlation between the $\\Delta R_{np}$ and $J-a_{\\text{sym}}$, where $J$ and $a_{\\text{sym}}$ are the symmetry energy (coefficient) of nuclear matter at saturation density and of $^{208}$Pb. An accurate $J-a_{\\text{sym}}$ thus places a strong constraint on the $\\Delta R_{np}$. Compared with the parity-violating asymmetry $A_{\\text{PV}}$ in the PREX, the reliably experimental information on the $J-a_{\\text{sym}}$ is much more easily available attributed to a wealth of measured data on nuclear masses and on decay energies. The density dependence of the symmetry energy is also well constrained with the $J-a_{\\...

Dong, Jianmin; Gu, Jianzhong

2015-01-01T23:59:59.000Z

147

Pyrosequencing analysis of endosymbiont population structure: co-occurrence of divergent symbiont  

E-Print Network [OSTI]

A and symB (93.5% nt identity), in 8 of 118 Vesicomya sp. clams from 3 of 7 hydrothermal vent sites and evolutionary unique adaptations to life in sulfidic, marine habitats (e.g. hydrothermal vents, reducing sedi the cells of an invertebrate host oxidize reduced chemicals to fuel carbon fixation, which in turn supports

Stewart, Frank

148

Stirring Strongly Coupled Plasma  

E-Print Network [OSTI]

We determine the energy it takes to move a test quark along a circle of radius L with angular frequency ? through the strongly coupled plasma of $\\mathcal{N}=4$ supersymmetric Yang–Mills (SYM) theory. We find that for most ...

Fadafan, Kazem Bitaghsir

149

Chemosynthetic endosymbioses: adaptations to oxicanoxic interfaces  

E-Print Network [OSTI]

, hydrothermal vent ecosystems rely on chemosynthesis, a process by which prokaryotic organisms synthesize C3 to those of their host. In habitats such as deep-sea hydrothermal vents, chemosynthetic sym- bioses-sea hydrothermal vents [2]. Unlike all other major ecosystems on Earth, which are driven by photosynthesis

Stewart, Frank

150

Electric Dipole Polarizability in $^{208}$Pb as a Probe of the Symmetry Energy and Neutron Matter around $\\rho_0/3$  

E-Print Network [OSTI]

It is currently a big challenge to accurately determine the symmetry energy $E_{\\text{sym}}(\\rho)$ and pure neutron matter equation of state $E_{\\text{PNM}}(\\rho)$, even their values around saturation density $\\rho_0 $. We find that the electric dipole polarizability $\\alpha _ {\\text{D}}$ in $^{208}$Pb can be determined uniquely by the magnitude of the $E_{\\text{sym}}(\\rho)$ or almost equivalently the $E_{\\text{PNM}}(\\rho)$ at subsaturation densities around $\\rho_0/3 $, shedding a light upon the genuine correlation between the $\\alpha _ {\\text{D}}$ and the $E_{\\text{sym}}(\\rho)$. By analyzing the experimental data of $\\alpha _ {\\text{D}}$ in $^{208}$Pb from RCNP using a number of non-relativistic and relativistic mean-field models, we obtain very stringent constraints on $E_{\\text{sym}}(\\rho)$ and $E_{\\text{PNM}}(\\rho)$ around $\\rho_0/3 $. The obtained constraints are found to be in good agreement with the results extracted in other analyses. In particular, our results provides for the first time the experime...

Zhang, Zhen

2015-01-01T23:59:59.000Z

151

Forces between aqueous nonuniformly charged colloids from molecular simulation  

E-Print Network [OSTI]

to obtain the colloid­colloid potential. In the second model, the pair potential is obtained, clays, or proteins.1­4 Such colloidal solutions ap- pear in many industrial processes, in particular,5­8 This approximation is satisfactory for describing highly sym- metric colloids such as synthetic latex or silica

Wu, Jianzhong

152

VOLUME 86, NUMBER 6 P H Y S I C A L R E V I E W L E T T E R S 5 FEBRUARY 2001 Multiple Andreev Reflections Revealed by the Energy Distribution of Quasiparticles  

E-Print Network [OSTI]

recently has been shown to describe in great detail the current-voltage characteristics [7], the noise [8 are sym- metrical with regard to the electrochemical potential of the superconductor. When two and quasiholes at symmetrical energies about the electrochemical potential m of the superconduc- tor is equal

Devoret, Michel H.

153

Symetrie et theorie des groupes `a travers la physique Jacques Villain  

E-Print Network [OSTI]

de la lumi`ere visible venant du soleil. 1 cea-00396043,version1-16Jun2009 #12;O2 H2O CO2 a b H4C Fig ou mol´ecules de haute sym´etrie. Quelques th´eor`emes (Noether, Goldstone...) ´etablissent des

Boyer, Edmond

154

ISodotY of PetroIeumEr@nwrsI Petroleum Reservoir Simulation in a Virtual Environment  

E-Print Network [OSTI]

a'4P w ._ m I I ISodotY of PetroIeumEr@nwrsI SPE 29118 Petroleum Reservoir Simulation in a VirtualSPE Member TM paperwas preperedfor presentationat the 13fh SPE Sym~ium on ReservoirSimulationheld in San, 1S2245SPEUT. ABSTRACT In this paper, we describe an approach to combining a reservoir simulation

155

Screening of quark-monopole in N=4 plasma  

E-Print Network [OSTI]

We study a quark-monopole bound system moving in N=4 SYM plasma with a constant velocity by the AdS/CFT correspondence. The screening length of this system is calculated, and is smaller than that of the quark-antiquark bound state.

Wei-shui Xu; Ding-fang Zeng

2014-12-11T23:59:59.000Z

156

30TH INTERNATIONAL COSMIC RAY CONFERENCE The High Energy Telescopes for the STEREO Mission  

E-Print Network [OSTI]

sym- metric about the central (vertical) axis. It consists of a passive aluminum housing which holds 9-class solar events in December, 2006 are pre- sented to illustrate the capabilities of the HETs. The HET the sun to 1 AU together with a variety of in situ instruments which include the Solar Energetic Particle

Reames, Donald V.

157

Acceleration of Preconditioned Krylov Solvers for Bubbly Flow Problems  

E-Print Network [OSTI]

eigen- values in the spectrum of M-1 A, see also [13]. This phenomenon also holds if we use other, preconditioning, sym- metric positive semi-definite matrices, bubbly flow problems. 1 Introduction Recently of this method is solving the symmetric and positive semi-definite (SPSD) linear system on each time step, which

Vuik, Kees

158

ON QUANTUM UNIQUE ERGODICITY FOR LOCALLY SYMMETRIC SPACES I  

E-Print Network [OSTI]

for an eigenfunction with a large eigen- value , |(x)| is approximately constant on Y . This can be approached demonstrate how to lift, in a "semi- canonical" fashion, limits of eigenfunction measures on locally sym symmetric spaces. 1. INTRODUCTION 1.1. General starting point: the semi-classical limit on Riemannian

Silberman, Lior

159

Acceleration of Preconditioned Krylov Solvers for Bubbly Flow Problems  

E-Print Network [OSTI]

and the computational time. Keywords: deflation, conjugate gradient method, preconditioning, sym- metric positive semi correction method [7]. The most time-consuming part of this method is solving the symmetric and positive semi with large jumps in the density, this method shows slow convergence, due to the presence of small eigen

Vuik, Kees

160

THE INVERSE OF A SEMI-INFINITE SYMMETRIC BANDED MATRIX  

E-Print Network [OSTI]

algorithm 3]. The eigen- values and eigen-vectors for the nite symmetric tridiagonal case were obtainedTHE INVERSE OF A SEMI-INFINITE SYMMETRIC BANDED MATRIX D. A. LAVISy , B. W. SOUTHERNz and I. F a method for obtaining an analytic form for a class of sym- metric semi-in nite banded matrices, which are

Lavis, David

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161

Reactor physics input to the safety analysis report for the High Flux Isotope Reactor  

SciTech Connect (OSTI)

HFIR specific, few group neutron and coupled neutron-gamma libraries have been prepared. These are based on data from ENDF/B-V and beginning-of-life (BOL) conditions. The neutron library includes actinide data for curium target rods. Six critical experiments, collectively designated HFIR critical experiment 4, were analyzed. Calculated k-effective was 2% high at BOL-typical conditions but was 1.0 at end-of-life-typical conditions. The local power density distributions were calculated for each of the critical experiments. The axially averaged values at a given radius were frequently within experimental error. However at individual points, the calculated local power densities were significantly different from the experimentally derived values (several times greater than experimental uncertainty). A reassessment of the foil activation data with transport theory techniques seems desirable. Using the results of the critical experiments study, a model of current HFIR configuration was prepared. As with the critical experiments, BOL k-effective was high (3%). However, end-of-life k-effective was high (2%). The end-of-life concentrations of fission products were compared to those generated using the ORIGEN code. Agreement was generally good through differences in the inventories of some important nuclides, Xe and I, need to be understood. End-of-cycle curium target isotopics based on measured, discharged target rods were compared to calculated values and agreement was good. Axial flux plots at various irradiation positions were generated. Time-dependent power distributions based on two-dimensional calculations were provided.

Primm, R.T. III.

1992-03-01T23:59:59.000Z

162

THE LUMINOSITIES OF PROTOSTARS IN THE SPITZER c2d AND GOULD BELT LEGACY CLOUDS  

SciTech Connect (OSTI)

Motivated by the long-standing 'luminosity problem' in low-mass star formation whereby protostars are underluminous compared to theoretical expectations, we identify 230 protostars in 18 molecular clouds observed by two Spitzer Space Telescope Legacy surveys of nearby star-forming regions. We compile complete spectral energy distributions, calculate L{sub bol} for each source, and study the protostellar luminosity distribution. This distribution extends over three orders of magnitude, from 0.01 L{sub Sun} to 69 L{sub Sun }, and has a mean and median of 4.3 L{sub Sun} and 1.3 L{sub Sun }, respectively. The distributions are very similar for Class 0 and Class I sources except for an excess of low luminosity (L{sub bol} {approx}< 0.5 L{sub Sun }) Class I sources compared to Class 0. 100 out of the 230 protostars (43%) lack any available data in the far-infrared and submillimeter (70 {mu}m <{lambda} < 850 {mu}m) and have L{sub bol} underestimated by factors of 2.5 on average, and up to factors of 8-10 in extreme cases. Correcting these underestimates for each source individually once additional data becomes available will likely increase both the mean and median of the sample by 35%-40%. We discuss and compare our results to several recent theoretical studies of protostellar luminosities and show that our new results do not invalidate the conclusions of any of these studies. As these studies demonstrate that there is more than one plausible accretion scenario that can match observations, future attention is clearly needed. The better statistics provided by our increased data set should aid such future work.

Dunham, Michael M.; Arce, Hector G. [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520 (United States); Allen, Lori E. [National Optical Astronomy Observatories, Tucson, AZ (United States); Evans II, Neal J.; Harvey, Paul M. [Department of Astronomy, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712-1205 (United States); Broekhoven-Fiene, Hannah; Matthews, Brenda C. [Herzberg Institute, National Research Council of Canada, 5071 W. Saanich Road, Victoria, BC V9E 2E7 (Canada); Chapman, Nicholas L. [Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Department of Physics and Astronomy, 2145 Sheridan Road, Evanston, IL 60208 (United States); Cieza, Lucas A. [Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822 (United States); Gutermuth, Robert A. [Department of Astronomy, University of Massachusetts, Amherst, MA (United States); Hatchell, Jennifer [Astrophysics Group, Physics, University of Exeter, Exeter EX4 4QL (United Kingdom); Huard, Tracy L.; Miller, Jennifer F. [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Kirk, Jason M. [School of Physics and Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff CF24 3AA (United Kingdom); Merin, Bruno [Herschel Science Centre, ESAC-ESA, P.O. Box 78, E-28691 Villanueva de la Canada, Madrid (Spain); Peterson, Dawn E. [Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301 (United States); Spezzi, Loredana, E-mail: michael.dunham@yale.edu [European Southern Observatory (ESO), Karl-Schwarzschild-Strasse 2, D-85748 Garching bei Muenchen (Germany)

2013-04-15T23:59:59.000Z

163

THE SPITZER MID-INFRARED ACTIVE GALACTIC NUCLEUS SURVEY. I. OPTICAL AND NEAR-INFRARED SPECTROSCOPY OF OBSCURED CANDIDATES AND NORMAL ACTIVE GALACTIC NUCLEI SELECTED IN THE MID-INFRARED  

SciTech Connect (OSTI)

We present the results of a program of optical and near-infrared spectroscopic follow-up of candidate active galactic nuclei (AGNs) selected in the mid-infrared. This survey selects both normal and obscured AGNs closely matched in luminosity across a wide range, from Seyfert galaxies with bolometric luminosities L {sub bol} ? 10{sup 10} L {sub ?} to highly luminous quasars (L {sub bol} ? 10{sup 14} L {sub ?}), all with redshifts ranging from 0 to 4.3. Samples of candidate AGNs were selected with mid-infrared color cuts at several different 24 ?m flux density limits to ensure a range of luminosities at a given redshift. The survey consists of 786 candidate AGNs and quasars, of which 672 have spectroscopic redshifts and classifications. Of these, 137 (20%) are type 1 AGNs with blue continua, 294 (44%) are type 2 objects with extinctions A{sub V} ?> 5 toward their AGNs, 96 (14%) are AGNs with lower extinctions (A{sub V} ? 1), and 145 (22%) have redshifts, but no clear signs of AGN activity in their spectra. Of the survey objects 50% have L {sub bol} > 10{sup 12} L {sub ?}, in the quasar regime. We present composite spectra for type 2 quasars and objects with no signs of AGN activity in their spectra. We also discuss the mid-infrared—emission-line luminosity correlation and present the results of cross correlations with serendipitous X-ray and radio sources. The results show that: (1) obscured objects dominate the overall AGN population, (2) mid-infrared selected AGN candidates exist which lack AGN signatures in their optical spectra but have AGN-like X-ray or radio counterparts, and (3) X-ray and optical classifications of obscured and unobscured AGNs often differ.

Lacy, M. [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Ridgway, S. E. [National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Gates, E. L. [UCO/Lick Observatory, P.O. Box 85, Mount Hamilton, CA 95140 (United States); Nielsen, D. M. [Department of Astronomy, University of Wisconsin, 475 N. Charter Street, Madison, WI 53706 (United States); Petric, A. O. [Department of Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States); Sajina, A. [Department of Physics and Astronomy, Tuffs University, 212 College Avenue, Medford, MA 02155 (United States); Urrutia, T. [Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam (Germany); Cox Drews, S. [946 Mangrove Avenue 102, Sunnyvale, CA 94086 (United States); Harrison, C. [Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 (United States); Seymour, N. [CSIRO, P.O. Box 76, Epping, NSW 1710 (Australia); Storrie-Lombardi, L. J. [Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125 (United States)

2013-10-01T23:59:59.000Z

164

RADIATION MECHANISM AND JET COMPOSITION OF GAMMA-RAY BURSTS AND GeV-TeV-SELECTED RADIO-LOUD ACTIVE GALACTIC NUCLEI  

SciTech Connect (OSTI)

Gamma-ray bursts (GRBs) and GeV-TeV-selected radio-loud active galactic nuclei (AGNs) are compared based on our systematic modeling of the observed spectral energy distributions of a sample of AGNs with a single-zone leptonic model. We show that the correlation between the jet power (P{sub jet}) and the prompt gamma-ray luminosity (L{sub jet}) of GRBs is consistent, within the uncertainties, with the correlation between jet power and the synchrotron peak luminosity (L{sub s,jet}) of flat spectrum radio quasars (FSRQs). Their radiation efficiencies ({epsilon}) are also comparable (>10% for most sources), which increase with the bolometric jet luminosity (L{sub bol,jet}) for FSRQs and with the L{sub jet} for GRBs with similar power-law indices. BL Lac objects (BL Lacs) do not follow the P{sub jet}-L{sub s,jet} relation of FSRQs. They have lower {epsilon} and L{sub bol,jet} values than FSRQs, and a tentative L{sub bol,jet}-{epsilon} relation is also found, with a power-law index different from that of the FSRQs. The magnetization parameters ({sigma}) of FSRQs are on average larger than that of BL Lacs. They are anti-correlated with {epsilon} for the FSRQs, but positively correlated with {epsilon} for the BL Lacs. GeV narrow-line Seyfert 1 galaxies potentially share similar properties with FSRQs. Based on the analogy between GRBs and FSRQs, we suggest that the prompt gamma-ray emission of GRBs is likely produced by the synchrotron process in a magnetized jet with high radiation efficiency, similar to FSRQs. The jets of BL Lacs, on the other hand, are less efficient and are likely more matter-dominated.

Zhang Jin; Lu Ye; Zhang Shuangnan [National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Liang Enwei; Sun Xiaona [Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004 (China); Zhang Bing, E-mail: lew@gxu.edu.cn [Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154 (United States)

2013-09-01T23:59:59.000Z

165

The Theoretical Mass--Magnitude Relation of Low-Mass Stars and its Metallicity Dependence  

E-Print Network [OSTI]

We investigate the dependence of theoretically generated mass - (absolute magnitude) relations on stellar models. Using up to date physics we compute models in the mass range 0.1 [Fe/H] > -2.3) shows a maximum in -dm/dM_bol, which moves to brighter bolometric magnitudes with decreasing metallicity. The change in location of the maximum, as a function of [Fe/H], follows the location of structure in luminosity functions for stellar populations with different metal abundances. This structure seen in all observed stellar populations can be accounted for by the mass--luminosity relation.

Pavel Kroupa; Christopher A. Tout

1997-01-28T23:59:59.000Z

166

Verbal Aspect and Negation in Russian and Czech  

E-Print Network [OSTI]

napisal novoe pis'mo, serde?no poblagodaril otca, skrupulezno pere?islil svoi minimal'nye rasxody i pokazal, kak èto malo. Otec s prokljatijami dobavil desjat' rublej. Bol'še iz nego Alik ne vyžal pf . (Rus; Meril 1985: 132–33) ‘Alik wrote a new... not spoil it.’ Aspect and Negation in Russian and Czech 24 (13) a. Otec ne razrešal ipf emu privodit' v dom devušek, no do?' narodnogo komisara — šutka skazat'! Takoj u Jurija ne bylo. (Rus; DA: 40) b. Otec Jurovi nedovoloval ipf , aby si...

Dickey, Stephen M.; Kresin, Susan C.

2009-01-01T23:59:59.000Z

167

A cost-benefit approach to youth vocational training schemes in Africa  

E-Print Network [OSTI]

) December 1974 ABSTRACT A COST-BENEFIT APPROACH TO YOUTH VOCATIONAL TRAINING SCHENES IN AFRICA. (December 1974) Emmanuel Bol Kuanyin, B. Sc. (Honours). Un1- verity of Khartoum, Sudan. Directed by: Dr. Alan Rufus Waters The objective of this thesis... is the construct1on of an analytical framework for the evaluation of benef1ts and costs of youth vocational train1ng schemes in Africa. After the discussion of the role of human capital in economic development and the problems of its accumu lat1on in Africa...

Kuanyin, Emmanuel Bol

1974-01-01T23:59:59.000Z

168

INFRARED CLASSIFICATION AND LUMINOSITIES FOR DUSTY ACTIVE GALACTIC NUCLEI AND THE MOST LUMINOUS QUASARS  

SciTech Connect (OSTI)

Mid-infrared spectroscopic measurements from the Infrared Spectrometer (IRS) on Spitzer are given for 125 hard X-ray active galactic nuclei (AGNs; 14-195 keV) from the Swift Burst Alert Telescope (BAT) sample and for 32 AGNs with black hole masses (BHMs) from reverberation mapping. The 9.7 {mu}m silicate feature in emission or absorption defines an infrared AGN classification describing whether AGNs are observed through dust clouds, indicating that 55% of the BAT AGNs are observed through dust. The mid-infrared dust continuum luminosity is shown to be an excellent indicator of intrinsic AGN luminosity, scaling closely with the hard X-ray luminosity, log {nu}L{sub {nu}}(7.8 {mu}m)/L(X) = -0.31 {+-} 0.35, and independent of classification determined from silicate emission or absorption. Dust luminosity scales closely with BHM, log {nu}L{sub {nu}}(7.8 {mu}m) = (37.2 {+-} 0.5) + 0.87 log BHM for luminosity in erg s{sup -1} and BHM in M{sub Sun }. The 100 most luminous type 1 quasars as measured in {nu}L{sub {nu}}(7.8 {mu}m) are found by comparing Sloan Digital Sky Survey (SDSS) optically discovered quasars with photometry at 22 {mu}m from the Wide-Field Infrared Survey Explorer (WISE), scaled to rest frame 7.8 {mu}m using an empirical template determined from IRS spectra. The most luminous SDSS/WISE quasars have the same maximum infrared luminosities for all 1.5 < z < 5, reaching total infrared luminosity L{sub IR} = 10{sup 14.4} L{sub Sun }. Comparing with dust-obscured galaxies from Spitzer and WISE surveys, we find no evidence of hyperluminous obscured quasars whose maximum infrared luminosities exceed the maximum infrared luminosities of optically discovered quasars. Bolometric luminosities L{sub bol} estimated from rest-frame optical or ultraviolet luminosities are compared to L{sub IR}. For the local AGN, the median log L{sub IR}/L{sub bol} = -0.35, consistent with a covering factor of 45% for the absorbing dust clouds. For the SDSS/WISE quasars, the median log L{sub IR}/L{sub bol} = 0.1, with extremes indicating that ultraviolet-derived L{sub bol} can be seriously underestimated even for type 1 quasars.

Weedman, Daniel; Sargsyan, Lusine; Houck, James; Barry, Donald [Astronomy Department, Cornell University, Ithaca, NY 14853 (United States); Lebouteiller, Vianney, E-mail: dweedman@isc.astro.cornell.edu [Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot, DAPNIA/Service d'Astrophysique, Saclay, F-91191 Gif-sur-Yvette Cedex (France)

2012-12-20T23:59:59.000Z

169

Geomorphic Equations and Methods for Natural Channel Design  

E-Print Network [OSTI]

significant predictors of the Q1.2. This led to Equation 2.2: 1.26 3.17 1.101.2Q 0.00258 CDA MAP L?? (2.2) Sy bol Watershed Characteristic Units DA Contributing Drainage Area mi 2 Sh Basin Shape Factor -- Sl Average Slope of Main Channel ft/mi SP........................................................................................... 97 6.4 BSCR by Grain Size .............................................................................................................. 98 vi List of Figures 1.1 A restored chute on the Missouri River in Saline, MO...

Shelley, John Edwin

2012-05-31T23:59:59.000Z

170

Aspects of glycine metabolism in juvenile white shrimp (Penaeus setiferus, L.) acutely exposed to hypersaline conditions  

E-Print Network [OSTI]

Penaeus set1ferus. D1stribution of tr1t1um label (adminis- te ed a~sll-gtycfne and gh-p oline) hetwe the FAA and macromolecular pools of abdom1nal muscle. . . . . . . . . . . . . . . . . . . . . 27 Penaeus set1ferus. Di str1but1on of C label (admin 1s... th1s an1mal is exposed to a hypersaline environment. Two meta- bol1c pathways by which the glycine levels might be increased have been investigated. The poss1b1lity that catabolism of a specif1c protein may contribute to the increased glyc1ne...

Koenig, Michael L

1981-01-01T23:59:59.000Z

171

On beta-deformations and Noncommutativity  

E-Print Network [OSTI]

We elucidate the connection between the N=1 beta-deformed SYM theory and noncommutativity. Our starting point is the T-duality generating transformation involved in constructing the gravity duals of both beta-deformed and noncommutative gauge theories. We show that the two methods can be identified provided that a particular submatrix of the O(3,3,R) group element employed in the former case, is interpreted as the noncommutativity parameter associated with the deformation of the transverse space. It is then explained how to construct the matrix in question, relying solely on information extracted from the gauge theory Lagrangian and basic notions of AdS/CFT. This result may provide an additional tool in exploring deformations of the N=4 SYM theory. Finally we use the uncovered relationship between beta-deformations and noncommutativity to find the gravity background dual to a noncommutative gauge theory with beta-type noncommutativity parameter.

Manuela Kulaxizi

2006-10-30T23:59:59.000Z

172

From AdS/CFT correspondence to hydrodynamics. II. Sound waves  

E-Print Network [OSTI]

As a non-trivial check of the non-supersymmetric gauge/gravity duality, we use a near-extremal black brane background to compute the retarded Green's functions of the stress-energy tensor in N=4 super-Yang-Mills (SYM) theory at finite temperature. For the long-distance, low-frequency modes of the diagonal components of the stress-energy tensor, hydrodynamics predicts the existence of a pole in the correlators corresponding to propagation of sound waves in the N=4 SYM plasma. The retarded Green's functions obtained from gravity do indeed exhibit this pole, with the correct values for the sound speed and the rate of attenuation.

G. Policastro; D. T. Son; A. O. Starinets

2005-07-26T23:59:59.000Z

173

Symmetry Energy Effects on the Nuclear Landscape  

E-Print Network [OSTI]

While various mean-field models predict similar two-proton drip line in the nuclear landscape, their predictions for the two-neutron drip line involve extreme extrapolations and exhibit a significant variation. We demonstrate that this variation is mainly due to the different values of the symmetry energy $E_{\\rm{sym}}(\\rho_{\\rm{c}})$ at the subsaturation cross density $\\rho_{\\rm{c}}\\approx 0.11$ fm$^{-3}$ for different interactions. Based on the recent accurate constraint on $E_{\\rm{sym}}(\\rho_{\\rm{c}})$, we obtain a quite precise prediction for the location of the two-neutron drip line and thus a very precise estimate of $1981 \\pm 76$ for the number of bound even-even nuclei with proton number between $2$ and $120$ among which only $799$ have so far been discovered experimentally.

Rui Wang; Lie-Wen Chen

2014-10-09T23:59:59.000Z

174

Correlations between the nuclear matter symmetry energy, its slope, and curvature from a nonrelativistic solvable approach and beyond  

E-Print Network [OSTI]

By using point-coupling versions of finite range nuclear relativistic mean field models containing cubic and quartic self interactions in the scalar field $\\sigma$, a nonrelativistic limit is achieved. This approach allows an analytical expression for the symmetry energy ($J$) as a function of its slope ($L$) in a unified form, namely, $\\,L\\,=\\,3J\\,+f(m^{*},\\rho_{o},B_{o},K_{o})$, where the quantities $m^{*}$, $\\rho_{o}$, $B_{o}$ and $K_{o}$ are bulk parameters at the nuclear matter saturation density $\\rho_{o}$. This result establishes a linear correlation between $L$ and $J$ which is reinforced by exact relativistic calculations. An analogous analytical correlation is also found for $J$, $L$ and the symmetry energy curvature ($K_{sym}$). Based on these results, we propose graphic constraints in $L\\times J$ and $K_{sym}\\times L$ planes which finite range models must satisfy.

B. M. Santos; M. Dutra; O. Lourenço; A. Delfino

2014-09-17T23:59:59.000Z

175

ELECTROABSORPTION BY IMPURITIES AND DEFECTS IN SEMI-INSULATING CdTe  

E-Print Network [OSTI]

263 ELECTROABSORPTION BY IMPURITIES AND DEFECTS IN SEMI-INSULATING CdTe G. NEU, Y. MARFAING, R des défauts dans CdTe compensé non dopé et dopé au chlore de 1,2 à 1,6 eV. Trois groupes de symétrie. Abstract. 2014 Electroabsorption experiments have been conducted on semi-insulating CdTe prepared

Paris-Sud XI, Université de

176

Experimental reconstruction of primary hot isotopes and characteristic properties of the fragmenting source in the heavy ion reactions near the Fermi energy  

E-Print Network [OSTI]

The characteristic properties of the hot nuclear matter existing at the time of fragment formation in the multifragmentation events produced in the reaction $^{64}$Zn + $^{112}$Sn at 40 MeV/nucleon are studied. A kinematical focusing method is employed to determine the multiplicities of evaporated light particles, associated with isotopically identified detected fragments. From these data the primary isotopic yield distributions are reconstructed using a Monte Carlo method. The reconstructed yield distributions are in good agreement with the primary isotope distributions obtained from AMD transport model simulations. Utilizing the reconstructed yields, power distribution, Landau free energy, characteristic properties of the emitting source are examined. The primary mass distributions exhibit a power law distribution with the critical exponent, $A^{-2.3}$, for $A \\geq 15$ isotopes, but significantly deviates from that for the lighter isotopes. Landau free energy plots show no strong signature of the first order phase transition. Based on the Modified Fisher Model, the ratios of the Coulomb and symmetry energy coefficients relative to the temperature, $a_{c}/T$ and $a_{sym}/T$, are extracted as a function of A. The extracted $a_{sym}/T$ values are compared with results of the AMD simulations using Gogny interactions with different density dependencies of the symmetry energy term. The calculated $a_{sym}/T$ values show a close relation to the symmetry energy at the density at the time of the fragment formation. From this relation the density of the fragmenting source is determined to be $\\rho /\\rho_{0} = (0.63 \\pm 0.03 )$. Using this density, the symmetry energy coefficient and the temperature of fragmenting source are determined in a self-consistent manner as $a_{sym} = (24.7 \\pm 3.4) MeV$ and $T=(4.9 \\pm 0.2)$ MeV.

W. Lin; X. Liu; M. R. D. Rodrigues; S. Kowalski; R. Wada; M. Huang; S. Zhang; Z. Chen; J. Wang; G. Q. Xiao; R. Han; Z. Jin; J. Liu; P. Ren; F. Shi; T. Keutgen; K. Hagel; M. Barbui; C. Bottosso; A. Bonasera; J. B. Natowitz; T. Materna; L. Qin; P. K. Sahu; H. Zheng

2014-09-14T23:59:59.000Z

177

Espaces de Hilbert J.Ch. Gilbert, Inria  

E-Print Network [OSTI]

2 K: Th'eor`eme de repr'esentation de Riesz­Fr'echet ffl Soit f 2 H 0 , alors il existe un unique 'el'ement x f 2 H tel que hf; xi = (x f ; x); 8x 2 H; de plus jx f j = kfk. G'en'eralisation du th'eor . Lorsque a est sym'etrique, on peut voir le th'eor`eme de Stampacchia ci­dessous comme une g

178

SPE/DOE 27789 Mechanistic Prediction of Foam Displacement in  

E-Print Network [OSTI]

vilal c.omponem of dle eagineerit:g"- and economic evaluation of tiIIy EOR project, efticiem apphcat ion, society of Petroleum Englnee,,, 1".. TM PaPm was PrePa,fl ~or PP?$e"MO" at the SPE/DOE NIn,h Sym@um 0" lm of the SoCiaWof Petroleum Engineers. IF of+ic.m, or members. Pa?ere presented a! % mee!lngs ? wblect

Patzek, Tadeusz W.

179

A guided mode in the range of the radiation modes for a rib Exemple d'un mode guid'e plong'e parmi les modes de radiation  

E-Print Network [OSTI]

Journal of Optics 28 (1997) 41­43 Abstract The stratified cladding of integrated optical waveguides is dis''etude s'epar'ee des modes sym'etriques et antisym'etriques. In integrated optics the cross: \\Gamma 4u \\Gamma k 2 n 2 = \\Gammafi 2 u; in R 2 ; (1) where k is the wave number, fi the propaga­ tion

Mahé, Fabrice

180

Table 3: Results of the Probability Based Heuristic Method for DD Reordering  

E-Print Network [OSTI]

1908:isc 13934 8762 78 c3540:isc 72858 43564 727 5xp1:pla 74 42 ! 1 9sym:pla 25 25 ! 1 alu4:pla 1197 567 3 bw:pla 108 101 ! 1 con1:pla 18 16 ! 1 duke2:pla 973 361 1 misex1:pla 41 37 ! 1 misex2:pla 136 96 ! 1 misex3:pla 1301 504 3 symmetry detection and decision diagram variable re­ ordering. Although some

Thornton, Mitchell

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181

Higher rank Wilson loops from a matrix model  

E-Print Network [OSTI]

We compute the circular Wilson loop of N=4 SYM theory at large N in the rank k symmetric and antisymmetric tensor representations. Using a quadratic Hermitian matrix model we obtain expressions for all values of the 't Hooft coupling. At large and small couplings we give explicit formulae and reproduce supergravity results from both D3 and D5 branes within a systematic framework.

Sean A. Hartnoll; S. Prem Kumar

2006-05-16T23:59:59.000Z

182

Bulletin of Tibetology: Volume 18 Number 4 : Full issue  

E-Print Network [OSTI]

. Vinnana is a link between one existence to another. It is also conditioned, and, therefore, is not permanent; con­ sciousness comes into being and passes away yielding place to new consciousness. Thus the stream of consciousness goes on until existence... of Dharma. The two Golden Fishes sym­ bolise resurrection, eternal life, rebirth, etc. They may also be taken to symbolise the eye of perception, as fishes can see throught muddy water. The Lucky Net symbolises Brahmajala representing all the theories...

Namgyal Institute of Tibetology

1982-01-01T23:59:59.000Z

183

Architectural space in the Gothic and Renaissance periods  

E-Print Network [OSTI]

in the preference for pure forms which articulate and link the whole together according to a simple, elementary law. In the ideal domed centralized scheme, no forward or upward drive dominates, but the rhythm from the west door to the dome of the crossing...-contained, perfectly sym- metrical, domed centralized structure ? illustrates the classical simplicity, tranquility of design, and harmonious and even distribution of masses which was the ideal of the Renaissance. The centric and proportional aspirations...

Lamb, Nellie Maie

1967-01-01T23:59:59.000Z

184

Revisit of the neutron/proton ratio puzzle in intermediate-energy heavy-ion collisions  

E-Print Network [OSTI]

Incorporating a newly improved isospin- and momentum-dependent interaction in the isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model IBUU11, we have investigated relative effects of the density dependence of nuclear symmetry energy $E_{sym}(\\rho)$ and the neutron-proton effective mass splitting $m^*_n-m^*_p$ on the neutron/proton ratio of free nucleons and those in light clusters. It is found that the $m^*_n-m^*_p$ has a relatively stronger effect than the $E_{sym}(\\rho)$ and the assumption of $m^*_n\\leq m^*_p$ leads to a higher neutron/proton ratio. Moreover, this finding is independent of the in-medium nucleon-nucleon cross sections used. However, results of our calculations using the $E_{sym}(\\rho)$ and $m^*_n-m^*_p$ both within their current uncertainty ranges are all too low compared to the recent NSCL/MSU double neutron/proton ratio data from central $^{124}$Sn+$^{124}$Sn and $^{112}$Sn+$^{112}$Sn collisions at 50 and 120 MeV/u, thus calling for new mechanisms to explain the puzzlingly high neutron/proton ratio observed in the experiments.

Hai-Yun Kong; Yin Xia; Jun Xu; Lie-Wen Chen; Bao-An Li; Yu-Gang Ma

2015-02-03T23:59:59.000Z

185

Revisit of the neutron/proton ratio puzzle in intermediate-energy heavy-ion collisions  

E-Print Network [OSTI]

Incorporating a newly improved isospin- and momentum-dependent interaction in the isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model IBUU11, we have investigated relative effects of the density dependence of nuclear symmetry energy $E_{sym}(\\rho)$ and the neutron-proton effective mass splitting $m^*_n-m^*_p$ on the neutron/proton ratio of free nucleons and those in light clusters. It is found that the $m^*_n-m^*_p$ has a relatively stronger effect than the $E_{sym}(\\rho)$ and the assumption of $m^*_n\\leq m^*_p$ leads to a higher neutron/proton ratio. Moreover, this finding is independent of the in-medium nucleon-nucleon cross sections used. However, results of our calculations using the $E_{sym}(\\rho)$ and $m^*_n-m^*_p$ both within their current uncertainty ranges are all too low compared to the recent NSCL/MSU double neutron/proton ratio data from central $^{124}$Sn+$^{124}$Sn and $^{112}$Sn+$^{112}$Sn collisions at 50 and 120 MeV/u, thus calling for new mechanisms to explain the puzzlingly high n...

Kong, Hai-Yun; Xu, Jun; Chen, Lie-Wen; Li, Bao-An; Ma, Yu-Gang

2015-01-01T23:59:59.000Z

186

Isobaric incompressibility of isospin asymmetric nuclear matter  

SciTech Connect (OSTI)

The isospin dependence of the saturation properties of asymmetric nuclear matter, particularly the incompressibility K{sub {infinity}}(X)=K{sub {infinity}}+K{sub {tau}}X{sup 2}+O(X{sup 4}) at saturation density, is systematically studied using density-dependent M3Y interaction. K{sub {tau}} characterizes the isospin dependence of the incompressibility at saturation density {rho}{sub 0}. The approximate expression K{sub asy}{approx_equal}K{sub sym}-6L is often used for K{sub {tau}} where L and K{sub sym} represent the slope and curvature parameters of the symmetry energy at {rho}{sub 0}, respectively. It can be expressed accurately as K{sub {tau}}=K{sub sym}-6L-(Q{sub 0}/K{sub {infinity}})L, where Q{sub 0} is the third-order-derivative parameter of symmetric nuclear matter at {rho}{sub 0}. The results of this addendum to [Phys. Rev. C 80, 011305(R) (2009)] indicate that the Q{sub 0} contribution to K{sub {tau}} is not insignificant.

Basu, D. N. [Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata 700 064 (India); Chowdhury, P. Roy [Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700 064 (India); Samanta, C. [Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700 064 (India); Physics Department, Virginia Commonwealth University, Richmond, Virginia 23284-2000 (United States); Physics Department, University of Richmond, Richmond, Virginia 23173 (United States)

2009-11-15T23:59:59.000Z

187

Self-consistent Determination of Temperature and Fluctuation Thermometer in Heavy-ion Reactions near the Fermi Energies  

E-Print Network [OSTI]

The density and temperature of a fragmenting system in a multifragmentation process are evaluated in a self-consistent manner using ratios between the ratio of the symmetry energy coefficient relative to the temperature, a_{sym}/T, extracted from the fragment yields generated by antisymmetrized molecular dynamics (AMD) simulations for central collisions of ^{40}Ca + ^{40}Ca at 35 MeV/nucleon. The a_{sym}/T values are extracted from all isotope yields by an improved method based on the Modified Fisher Model (MFM). The ratios of a_{sym}/T obtained, using interactions with different density dependencies of the symmetry energy term, reflect the ratios of the symmetry energy at the density of fragment formation. Using this correlation, the density is found to be \\rho/\\rho_0 = 0.66 \\pm 0.02. The symmetry energy values for each interaction are determined at this density. With these values, temperature values are extracted as a function of isotope mass A. The extracted temperature values are compared with those evalu...

Liu, X; Wada, R; Huang, M; Chen, Z; Xiao, G Q; Zhang, S; Jin, X; Liu, J; Shi, F; Ren, P; Zheng, H; Natowitz, J B; Bonasera, A

2014-01-01T23:59:59.000Z

188

Primary Isotope Yields and Characteristic Properties of the Fragmenting Source in Heavy-ion Reactions near the Fermi Energies  

E-Print Network [OSTI]

For central collisions of $^{40}$Ca $+ ^{40}$Ca at 35 MeV/nucleon, the density and temperature of a fragmenting source have been evaluated in a self-consistent manner using the ratio of the symmetry energy coefficient relative to the temperature, $a_{sym}/T$, extracted from the yields of primary isotopes produced in antisymmetrized molecular dynamics (AMD) simulations. The $a_{sym}/T$ values are extracted from all isotope yields using an improved method based on the Modified Fisher Model (MFM). The values of $a_{sym}/T$ obtained, using different interactions with different density dependencies of the symmetry energy term, are correlated with the values of the symmetry energies at the density of fragment formation. Using this correlation, the fragment formation density is found to be $\\rho/\\rho_0 = 0.67 \\pm 0.02$. Using the input symmetry energy value for each interaction temperature values are extracted as a function of isotope mass $A$. The extracted temperature values are compared with those evaluated from the fluctuation thermometer with a radial flow correction.

X. Liu; W. Lin; R. Wada; M. Huang; Z. Chen; G. Q. Xiao; S. Zhang; X. Jin; J. Liu; F. Shi; P. Ren; H. Zheng; J. B. Natowitz; A. Bonasera

2014-06-13T23:59:59.000Z

189

The distance scale and Eddington efficiency of luminous quasars  

E-Print Network [OSTI]

The relation between the central mass and quasar luminosity (M_BH \\propto L^{\\alpha}FHWM^2) links a given Eddington ratio with a value of H_0, within a cosmology with fixed (\\Omega_m,\\Omega_{\\Lambda}). We point out that because the relation is calibrated at low z using distance independent reverberation mapping to get the BLR size, the derived M_BH interestingly does not depend on H_0, while L/L_Edd is sensitive to H_0, but rather robust to changes of \\Omega_{\\Lambda} in the standard flat model. This means, e.g., that enough of extragalactic objects radiating at the Eddington limit could be used to study the global Hubble constant in a new way, bypassing the local distance ladder. The method could become practical when systematic errors in derived M_BH are understood and objects with L /leq L_Edd can be independently identified. As an illustration, if we take a sample of tranquil very luminous quasars in the redshift range 0.5 < z < 1.6, and assume that they are radiating with L_bol \\leq L_Edd, then the usual numeric factors used for calculating M_BH and L_bol would lead to the result that the Hubble constant must be larger than 45 km/s/Mpc.

P. Teerikorpi

2005-10-13T23:59:59.000Z

190

Improved Accelerated Stress Tests Based on Fuel Cell Vehicle Data  

SciTech Connect (OSTI)

UTC will led a top-tier team of industry and national laboratory participants to update and improve DOE’s Accelerated Stress Tests (AST’s) for hydrogen fuel cells. This in-depth investigation will focused on critical fuel cell components (e.g. membrane electrode assemblies - MEA) whose durability represented barriers for widespread commercialization of hydrogen fuel cell technology. UTC had access to MEA materials that had accrued significant load time under real-world conditions in PureMotion® 120 power plant used in transit buses. These materials are referred to as end-of-life (EOL) components in the rest of this document. Advanced characterization techniques were used to evaluate degradation mode progress using these critical cell components extracted from both bus power plants and corresponding materials tested using the DOE AST’s. These techniques were applied to samples at beginning-of-life (BOL) to serve as a baseline. These comparisons advised the progress of the various failure modes that these critical components were subjected to, such as membrane degradation, catalyst support corrosion, platinum group metal dissolution, and others. Gaps in the existing ASTs predicted the degradation observed in the field in terms of these modes were outlined. Using the gaps, new AST’s were recommended and tested to better reflect the degradation modes seen in field operation. Also, BOL components were degraded in a test vehicle at UTC designed to accelerate the bus field operation.

Patterson, Timothy [Research Engineer] [Research Engineer; Motupally, Sathya [Research Engineer] [Research Engineer

2012-06-01T23:59:59.000Z

191

The progenitor of the FUor-type young eruptive star 2MASS J06593158-0405277  

E-Print Network [OSTI]

Only a dozen confirmed FU Orionis-type young outbursting stars (FUors) are known today; this explains the interest in the recent FUor eruption of 2MASS J06593158-0405277. Its outburst and expected decline will be subject to numerous studies in the future. Almost equally important for the understanding of the eruption mechanism, however, is the physical characterization of the FUor's precursor. Here we analyze unpublished archival data and summarize - and partly revise - all relevant photometry from optical to submillimeter wavelengths. Our analysis implies that the FUor is possibly associated with eight T Tauri star candidates and a strong Class 0 source. Adopting a distance of 450 pc for the FUor, we derive a quiescent bolometric luminosity and temperature of L_bol = 4.8 L_Sun and T_bol = 1190 K, typical for young Class II sources. The central star has a temperature of T_eff = 4000 K, a mass of 0.75 M_Sun, and an age of about 6 x 10^5 yr. The SED implies a circumstellar mass of 0.01 - 0.06 M_Sun, and the sys...

Kóspál, Á; Moór, A; Haas, M; Chini, R; Hackstein, M

2015-01-01T23:59:59.000Z

192

Plus c`est la meme chose: The future of nuclear weapons in Europe  

SciTech Connect (OSTI)

Since the end of the Cold War, the United States perhaps more than any other nuclear weapon state has deeply questioned the future role of nuclear weapons, both in a strategic sense and in Europe. It is probably the United States that has raised the most questions about the continuing need for and efficacy of nuclear weapons, and has expressed the greatest concerns about the negative consequences of continuing nuclear weapons deployment. In the US, this period of questioning has now come to a pause, if not a conclusion. In late 1994 the United States decided to continue to pursue reductions in numbers of nuclear weapons as well as other changes designed to reduce the dangers associated with the possession of nuclear weapons. But at the same time the US concluded that some number of nuclear forces would continue to be needed for national security for the foreseeable future. These necessary nuclear forces include a continuing but greatly reduced stockpile of nuclear bombs deployed in Europe under NATO`s New Strategic Concept. If further changes to the US position on nuclear weapons in Europe are to occur, it is likely to be after many years, and only in the context of dramatic additional improvements in the political and geo-political climate in and around Europe. The future role of nuclear weapons in Europe, as discussed in this report, depends in part on past and future decisions by the United States. but it must also be noted that other states that deploy nuclear weapons in Europe--Britain, France, and Russia, as well as the NATO alliance--have shown little inclination to discontinue their deployment of such weapons, whatever the United States might choose to do in the future.

Maaranen, S.A.

1996-07-01T23:59:59.000Z

193

Assessing the risk from the depleted uranium weapons used in Operation Allied Force  

E-Print Network [OSTI]

The conflict in Yugoslavia has been a source of great concern for the neighboring countries, about the radiological and toxic hazard posed by the alleged presence of depleted uranium in NATO weapons. In the present study a worst-case scenario is assumed mainly to assess the risk for Greece and other neighboring countries of Yugoslavia at similar distances . The risk of the weapons currently in use is proved to be negligible at distances greater than 100 Km. For shorter distances classified data of weapons composition are needed to obtain a reliable assessment.

Liolios, T E

1999-01-01T23:59:59.000Z

194

Nevada STEP Training  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the Contributions andDataNational Library of1, 2007TransmissiontoSystem | Department|NAto

195

Nevada Waste Leaves Idaho Facility  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the Contributions andDataNational Library of1, 2007TransmissiontoSystem | Department|NAto

196

Twisted 3D N=4 supersymmetric YM on deformed A{sub 3}{sup *} lattice  

SciTech Connect (OSTI)

We study a class of twisted 3D N=4 supersymmetric Yang-Mills (SYM) theory on particular 3-dimensional lattice L{sub 3D} formally denoted as L{sub 3D}{sup su{sub 3}×u{sub 1}} and given by non-trivial fibration L{sub 1D}{sup u{sub 1}}×L{sub 2D}{sup su{sub 3}} with base L{sub 2D}{sup su{sub 3}}=A{sub 2}{sup *}, the weight lattice of SU(3). We first, develop the twisted 3D N=4 SYM in continuum by using superspace method where the scalar supercharge Q is manifestly exhibited. Then, we show how to engineer the 3D lattice L{sub 3D}{sup su{sub 3}×u{sub 1}} that host this theory. After that we build the lattice action S{sub latt} invariant under the following three points: (i) U(N) gauge invariance, (ii) BRST symmetry, (iii) the S{sub 3} point group symmetry of L{sub 3D}{sup su{sub 3}×u{sub 1}}. Other features such as reduction to twisted 2D supersymmetry with 8 supercharges living on L{sub 2D}?L{sub 2D}{sup su{sub 2}×u{sub 1}}, the extension to twisted maximal 5D SYM with 16 supercharges on lattice L{sub 5D}?L{sub 5D}{sup su{sub 4}×u{sub 1}} as well as the relation with known results are also given.

Saidi, El Hassan [Lab of High Energy Physics, Modeling and Simulations, Faculty of Science, University Mohamed V-Agdal, Morocco and Centre of Physics and Mathematics, CPM, Rabat (Morocco)] [Lab of High Energy Physics, Modeling and Simulations, Faculty of Science, University Mohamed V-Agdal, Morocco and Centre of Physics and Mathematics, CPM, Rabat (Morocco)

2014-01-15T23:59:59.000Z

197

(A)symtrie et convergence des chocs macroconomiques en Asie de l'Est : une analyse dynamique  

E-Print Network [OSTI]

macroéconomiques et d'examiner leur évolution au fil du temps pour les pays de l'Asean+3 afin de mieux comprendre économies de l'Asean+3. Pour cela, nous utilisons une méthodologie dynamique basée sur le filtre de Kalman effets sur les pays de l'Asean+3 et qu'il y a un avant et un après crise. Mots-clefs : (a)symétrie des

Paris-Sud XI, Université de

198

Exact Lattice Supersymmetry  

SciTech Connect (OSTI)

We provide an introduction to recent lattice formulations of supersymmetric theories which are invariant under one or more real supersymmetries at nonzero lattice spacing. These include the especially interesting case of N = 4 SYM in four dimensions. We discuss approaches based both on twisted supersymmetry and orbifold-deconstruction techniques and show their equivalence in the case of gauge theories. The presence of an exact supersymmetry reduces and in some cases eliminates the need for fine tuning to achieve a continuum limit invariant under the full supersymmetry of the target theory. We discuss open problems.

Catterall, Simon; Kaplan, David B.; Unsal, Mithat

2009-03-31T23:59:59.000Z

199

Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient  

E-Print Network [OSTI]

A quantitative spectral analysis of 24 A supergiants in the Sculptor Group spiral galaxy NGC 300 at a distance of 1.9 Mpc is presented. A new method is introduced to analyze low resolution (~5 AE) spectra, which yields metallicities accurate to 0.2 dex including the uncertainties arising from the errors in Teff (5%) and log g (0.2 dex). For the first time the stellar metallicity gradient based on elements such as titanium and iron in a galaxy beyond the Local Group is investigated. Solar metallicity is measured in the center and 0.3 solar in the outskirts and a logarithmic gradient of -0.08 dex/kpc. An average reddening of E(B-V)~0.12 mag is obtained, however with a large variation from 0.07 to 0.24 mag. We also determine stellar radii, luminosities and masses and discuss the evolutionary status. Finally, the observed relationship between absolute bolometric magnitudes M_{bol} and flux weighted gravities g_{F} = g/Teff^4 is investigated. At high temperatures the strengths of the Balmer lines depends solely on the flux-weighted gravity, which allows a precise direct determination of log g_{F} with an accuracy of 0.05 to 0.1 dex. We find a tight relationship between M_{bol} and log g_{F} in agreement with stellar evolution theory. Combining these new results with previous work on Local Group galaxies we obtain a new flux weighted gravity luminosity relationship (FGLR), which is very well defined and appears to be an excellent alternative tool to determine distances to galaxies.

R. -P. Kudritzki; M. A. Urbaneja; F. Bresolin; N. Przybilla; W. Gieren; G. Pietrzynski

2008-03-26T23:59:59.000Z

200

IMPLICATIONS OF MASS AND ENERGY LOSS DUE TO CORONAL MASS EJECTIONS ON MAGNETICALLY ACTIVE STARS  

SciTech Connect (OSTI)

Analysis of a database of solar coronal mass ejections (CMEs) and associated flares over the period 1996-2007 finds well-behaved power-law relationships between the 1-8 A flare X-ray fluence and CME mass and kinetic energy. We extrapolate these relationships to lower and higher flare energies to estimate the mass and energy loss due to CMEs from stellar coronae, assuming that the observed X-ray emission of the latter is dominated by flares with a frequency as a function of energy dn/dE = kE {sup -{alpha}}. For solar-like stars at saturated levels of X-ray activity, the implied losses depend fairly weakly on the assumed value of {alpha} and are very large: M-dot {approx}5 Multiplication-Sign 10{sup -10} M{sub sun} yr{sup -1} and E-dot {approx}0.1 L{sub sun}. In order to avoid such large energy requirements, either the relationships between CME mass and speed and flare energy must flatten for X-ray fluence {approx}> 10{sup 31} erg, or the flare-CME association must drop significantly below 1 for more energetic events. If active coronae are dominated by flares, then the total coronal energy budget is likely to be up to an order of magnitude larger than the canonical 10{sup -3} L {sub bol} X-ray saturation threshold. This raises the question of what is the maximum energy a magnetic dynamo can extract from a star? For an energy budget of 1% of L {sub bol}, the CME mass loss rate is about 5 Multiplication-Sign 10{sup -11} M {sub Sun} yr{sup -1}.

Drake, Jeremy J.; Cohen, Ofer [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)] [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Yashiro, Seiji [Interferometrics Inc., Herndon, VA 20171 (United States)] [Interferometrics Inc., Herndon, VA 20171 (United States); Gopalswamy, Nat, E-mail: jdrake@cfa.harvard.edu [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)] [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

2013-02-20T23:59:59.000Z

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201

Extraction of the symmetry energy coefficients from the masses differences of isobaric nuclei  

E-Print Network [OSTI]

The nuclear symmetry energy coefficients of finite nuclei are extracted by using the differences between the masses of isobaric nuclei. Based on the masses of more than 2400 nuclei with $A=9-270$, we investigate the model dependence in the extraction of symmetry energy coefficient. We find that the extraction of the symmetry energy coefficients is strongly correlated with the forms of the Coulomb energy and the mass dependence of the symmetry energy coefficient adopted. The values of the extracted symmetry energy coefficients increase by about 2 MeV for heavy nuclei when the Coulomb correction term is involved. We obtain the bulk symmetry energy coefficient $S_0=28.26\\pm1.3$ MeV and the surface-to-volume ratio $\\kappa=1.26\\pm 0.25 $ MeV if assuming the mass dependence of symmetry energy coefficient $a_{\\rm sym}(A)=S_0(1-\\kappa/A^{1/3})$, and $S_0=32.80\\pm1.7$ MeV, $\\kappa=2.82\\pm0.57$ MeV when $a_{\\rm sym}(A)=S_0 (1+\\kappa/A^{1/3})^{-1}$ is adopted.

Junlong Tian; Haitao Cui; Kuankuan Zheng; Ning Wang

2014-03-28T23:59:59.000Z

202

Low-momentum interactions with Brown-Rho-Ericson scalings, and the density dependence of the nuclear symmetry energy  

SciTech Connect (OSTI)

We have calculated the nuclear symmetry energy E{sub sym}({rho}) up to densities of 4-5{rho}{sub 0} with the effects from the Brown-Rho (BR) and Ericson scalings with the in-medium mesons included. Using the V{sub lowk} low-momentum interaction with and without such scalings, the equations of state (EOSs) of symmetric and asymmetric nuclear matter have been calculated using a ring-diagram formalism where the particle-particle-hole-hole ring diagrams are included to all orders. The EOSs for symmetric nuclear matter and neutron matter obtained with linear BR scaling are both overly stiff compared with the empirical constraints of Danielewicz et al. [Science 298, 1592 (2002)]. In contrast, satisfactory results are obtained by either using the nonlinear Ericson scaling or by adding a Skyrme-type three-nucleon force (TNF) to the unscaled V{sub lowk} interaction. Our results for E{sub sym}({rho}) obtained with the nonlinear Ericson scaling are in good agreement with the empirical values of Tsang et al. [Phys. Rev. Lett. 102, 122701 (2009)] and Li et al. [Phys. Rev. C 72, 064611 (2005)], while those with the TNF are slightly below these values. For densities below the nuclear saturation density {rho}{sub 0}, the results of the above calculations are nearly equivalent to each other and all are in satisfactory agreement with the empirical values.

Dong Huan; Kuo, T. T. S.; Machleidt, R. [Department of Physics and Astronomy, Stony Brook University, New York 11794-3800 (United States); Department of Physics, University of Idaho, Moscow, Idaho 83844 (United States)

2011-05-15T23:59:59.000Z

203

Low-momentum interactions with Brown-Rho-Ericson scalings and the density dependence of the nuclear symmetry energy  

E-Print Network [OSTI]

We have calculated the nuclear symmetry energy $E_{sym}(\\rho)$ up to densities of $4 \\sim 5 \\rho_0$ with the effects from the Brown-Rho (BR) and Ericson scalings for the in-medium mesons included. Using the $V_{low-k}$ low-momentum interaction with and without such scalings, the equations of state (EOS) of symmetric and asymmetric nuclear matter have been calculated using a ring-diagarm formalism where the particle-particle-hole-hole ring diagrams are included to all orders. The EOS for symmetric nuclear matter and neutron matter obtained with linear BR scaling are both overly stiff compared with the empirical constraints of Danielewicz {\\it et al.} \\cite{daniel02}. In contrast, satisfactory results are obtained by either using the nonlinear Ericson scaling or by adding a Skyrme-type three-nucleon force (TNF) to the unscaled $V_{low-k}$ interaction. Our results for $E_{sym}(\\rho)$ obtained with the nonlinear Ericson scaling are in good agreement with the empirical values of Tsang {\\it et al.} \\cite{tsang09} a...

Dong, Huan; Machleidt, R

2011-01-01T23:59:59.000Z

204

Low-momentum interactions with Brown-Rho-Ericson scalings and the density dependence of the nuclear symmetry energy  

E-Print Network [OSTI]

We have calculated the nuclear symmetry energy $E_{sym}(\\rho)$ up to densities of $4 \\sim 5 \\rho_0$ with the effects from the Brown-Rho (BR) and Ericson scalings for the in-medium mesons included. Using the $V_{low-k}$ low-momentum interaction with and without such scalings, the equations of state (EOS) of symmetric and asymmetric nuclear matter have been calculated using a ring-diagarm formalism where the particle-particle-hole-hole ring diagrams are included to all orders. The EOS for symmetric nuclear matter and neutron matter obtained with linear BR scaling are both overly stiff compared with the empirical constraints of Danielewicz {\\it et al.} \\cite{daniel02}. In contrast, satisfactory results are obtained by either using the nonlinear Ericson scaling or by adding a Skyrme-type three-nucleon force (TNF) to the unscaled $V_{low-k}$ interaction. Our results for $E_{sym}(\\rho)$ obtained with the nonlinear Ericson scaling are in good agreement with the empirical values of Tsang {\\it et al.} \\cite{tsang09} and Li {\\it et al.} \\cite{li05}, while those with TNF are slightly below these values. For densities below the nuclear saturation density $\\rho_0$, the results of the above calculations are nearly equivalent to each other and all in satisfactory agreement with the empirical values.

Huan Dong; T. T. S. Kuo; R. Machleidt

2011-01-10T23:59:59.000Z

205

Deformed Matrix Models, Supersymmetric Lattice Twists and N=1/4 Supersymmetry  

SciTech Connect (OSTI)

A manifestly supersymmetric nonperturbative matrix regularization for a twisted version of N = (8, 8) theory on a curved background (a two-sphere) is constructed. Both continuum and the matrix regularization respect four exact scalar supersymmetries under a twisted version of the supersymmetry algebra. We then discuss a succinct Q = 1 deformed matrix model regularization of N = 4 SYM in d = 4, which is equivalent to a non-commutative A*{sub 4} orbifold lattice formulation. Motivated by recent progress in supersymmetric lattices, we also propose a N = 1/4 supersymmetry preserving deformation of N = 4 SYM theory on R{sup 4}. In this class of N = 1/4 theories, both the regularized and continuum theory respect the same set of (scalar) supersymmetry. By using the equivalence of the deformed matrix models with the lattice formulations, we give a very simple physical argument on why the exact lattice supersymmetry must be a subset of scalar subalgebra. This argument disagrees with the recent claims of the link approach, for which we give a new interpretation.

Unsal, Mithat

2008-09-24T23:59:59.000Z

206

Electronic structure of the dioxygen to transition metal bond: generalized molecular orbital calculations on models of manganese, iron, and cobalt porphyrins  

E-Print Network [OSTI]

are reported for FeP where P = porphinato(2-) ~ (NH2)4 , (NHCH2)4 , (N4C2H10) , (N4CBH6) and for Fe(02)PL where P = porphi nato(2-), (NH2)4 , (N4C2H6) and L = imidazole, NH3. The MO calculations indicate that (N4C2H6) is a better model for the porphyri n... ring in metal-dioxygen porphyrin complexes than the model (NH ) . This model was employed in generalized molecular orbital-confi guration interaction calculations of Fe(02)P(NH3), Co(02)P(NH3), and Mn(02)P where P = (N4C2H6) The ozone...

Newton, James Edward

1982-01-01T23:59:59.000Z

207

THE NUCLEAR INFRARED EMISSION OF LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI  

SciTech Connect (OSTI)

We present high-resolution mid-infrared (MIR) imaging, nuclear spectral energy distributions (SEDs), and archival Spitzer spectra for 22 low-luminosity active galactic nuclei (LLAGNs; L{sub bol} {approx}< 10{sup 42} erg s{sup -1}). Infrared (IR) observations may advance our understanding of the accretion flows in LLAGNs, the fate of the obscuring torus at low accretion rates, and, perhaps, the star formation histories of these objects. However, while comprehensively studied in higher-luminosity Seyferts and quasars, the nuclear IR properties of LLAGNs have not yet been well determined. We separate the present LLAGN sample into three categories depending on their Eddington ratio and radio emission, finding different IR characteristics for each class. (1) At the low-luminosity, low-Eddington-ratio (log L{sub bol}/L{sub Edd} < -4.6) end of the sample, we identify 'host-dominated' galaxies with strong polycyclic aromatic hydrocarbon bands that may indicate active (circum-)nuclear star formation. (2) Some very radio-loud objects are also present at these low Eddington ratios. The IR emission in these nuclei is dominated by synchrotron radiation, and some are likely to be unobscured type 2 AGNs that genuinely lack a broad-line region. (3) At higher Eddington ratios, strong, compact nuclear sources are visible in the MIR images. The nuclear SEDs of these galaxies are diverse; some resemble typical Seyfert nuclei, while others lack a well-defined MIR 'dust bump'. Strong silicate emission is present in many of these objects. We speculate that this, together with high ratios of silicate strength to hydrogen column density, could suggest optically thin dust and low dust-to-gas ratios, in accordance with model predictions that LLAGNs do not host a Seyfert-like obscuring torus. We anticipate that detailed modeling of the new data and SEDs in terms of accretion disk, jet, radiatively inefficient accretion flow, and torus components will provide further insights into the nuclear structures and processes of LLAGNs.

Mason, R. E. [Gemini Observatory, Northern Operations Center, 670 N. A'ohoku Place, Hilo, HI 96720 (United States); Lopez-Rodriguez, E.; Packham, C. [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, P.O. Box 112055, Gainesville, FL 32611 (United States); Alonso-Herrero, A. [Instituto de Fisica de Cantabria, CSIC-UC, Avenida de los Castros s/n, 39005 Santander (Spain); Levenson, N. A.; Radomski, J. [Gemini Observatory, Southern Operations Center, c/o AURA, Casilla 603, La Serena (Chile); Ramos Almeida, C. [Instituto de Astrofisica de Canarias, C/Via Lactea, s/n, E-38205, La Laguna, Tenerife (Spain); Colina, L. [Departamento de Astrofisica, Centro de Astrobiologia (CSIC/INTA), Instituto Nacional de Tecnica Aeroespacial, Crta de Torrejon a Ajalvir, km 4, 28850 Torrejon de Ardoz, Madrid (Spain); Elitzur, M. [Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506 (United States); Aretxaga, I. [Instituto Nacional de Astrofisica, Optica y Electronica (INAOE), Aptdo. Postal 51 y 216, 72000 Puebla (Mexico); Roche, P. F. [Astrophysics, Department of Physics, University of Oxford, DWB, Keble Road, Oxford OX1 3RH (United Kingdom); Oi, N. [Department of Astronomy, School of Science, Graduate University for Advanced Studies (SOKENDAI), Mitaka, Tokyo 181-8588 (Japan)

2012-07-15T23:59:59.000Z

208

Development of a Low-Cost, Durable Membrane and MEA for Stationary and Mobile Fuel Cell Applications  

SciTech Connect (OSTI)

The development of low cost, durable membranes and membranes electrode assemblies (MEAs) remain a critical challenge for the successful introduction of fuel cells into mass markets. It was the goal of the team lead by Arkema, Inc. (formerly Atofina, Inc.) to address these shortages. Thus, this project addresses the following technical barriers from the Fuel Cells section of the Hydrogen Fuel Cells and Infrastructure Technologies Program Multi-Year Research, Development and Demonstration Plan: (A) Durability (B) Cost Arkema’s approach consisted in using blends of polyvinylidenefluoride (PVDF) and proprietary sulfonated polyelectrolytes. The strength and originality of Arkema’s approach lies in the decoupling of ion conductivity from the other requirements. Kynar® (Arkema trade name for PVDF) provides an exceptional combination of properties that make it ideally suited for a membrane matrix. In a first phase, Arkema demonstrated the feasibility of the concept with the M31 membrane generation. After MEA optimization, it was shown that the beginning-of-life (BOL) performance of M31 MEAs was essentially on a par with that of PFSA MEAs at 60ºC under fully humidified conditions. On the other hand, long-term durability studies showed a high decay rate of 45µV/h over a 2100 hr. test. Arkema then designed several families of polyelectrolyte candidates, which – in principle – could not undergo the same failure mechanisms. A new membrane candidate was developed: M41. It offered the same generally good mechanical, ex-situ conductivity and gas barrier properties as M31. In addition, ex-situ accelerated testing suggested a several orders of magnitude improvement in chemical stability. M41 based MEAs showed comparable BOL performance with that of PFSA (80ºC, 100% RH). M41 MEAs were further shown to be able to withstand several hours temperature excursions at 120ºC without apparent damage. Accelerated studies were carried out using the DOE and/or US Fuel Cell Council protocols. M41 MEAs shown sizeable advantages over PFSA MEAs in the Open Circuit Voltage Hold test, Relative Humidity Cycling test and the Voltage Cycling test. The main known limitation of the M41 family is its ability to function well at low RH.

Michel Foure, Scott Gaboury, Jim Goldbach, David Mountz and Jung Yi (no longer with company)

2008-01-31T23:59:59.000Z

209

Chandra Observations of Associates of $?$ Car: I. Luminosities  

E-Print Network [OSTI]

The region around the $\\eta$ Car nebula has three OB associations, which contain a Wolf-Rayet star and several massive O3 stars. An early Chandra ACIS-I image was centered on $\\eta$ Car and includes Trumpler 16 and part of Trumpler 14. The Chandra image confirms the well-known result that O and very early B stars are X-ray sources with L$_X$ $\\simeq$ 10$^{-7} \\times$ L$_{bol}$ over an X-ray luminosity range of about 100. Two new anomalously strong X-ray sources have been found among the hot star population, Tr 16-244, a heavily-reddened O3 I star, and Tr 16-22, a heavily-reddened O8.5 V star. Two stars have an unusually large L$_X$/L$_{bol}$: HD 93162, a Wolf-Rayet star (and possible binary), and Tr 16-22, a possible colliding wind binary In addition, a population of sources associated with cool stars is detected. In the color-magnitude diagram, these X-ray sources sit above the sequence of field stars in the Carina arm. The OB stars are on average more X-ray luminous than the cool star X-ray sources. X-ray sources among A stars have similar X-ray luminosities to cooler stars, and may be due to cooler companions. Upper limits are presented for B stars which are not detected in X-rays. These upper limits are also the upper limits for any cool companions which the hot stars may have. Hardness ratios are presented for the most luminous sources in bands 0.5 to 0.9 keV, 0.9 to 1.5 keV, and 1.5 to 2.04 kev. The available information on the binary nature of the hot stars is discussed, but binarity does not correlate with X-ray strength in a simple way.

Nancy Remage Evans; Frederick D. Seward; Miriam I. Krauss; Takashi Isobe; Joy Nichols; Eric M. Schlegel; Scott J. Wolk

2003-01-24T23:59:59.000Z

210

Flavoured Large N Gauge Theory on a Compact Space with an External Magnetic Field  

E-Print Network [OSTI]

The phase structure of flavoured N=2 SYM on a three sphere in an external magnetic field is studied. The pairing effect of the magnetic field competes with the dissociating effect of the Casimir free energy, leading to an interesting phase structure of confined and deconfined phases separated by a critical curve of a first order quantum phase transition. At vanishing magnetic field the phase transition is of a third order. For sufficiently strong magnetic field, the only stable phase is the confined phase and magnetic catalysis of chiral symmetry breaking is realized. The meson spectra of the theory exhibit Zeeman splitting and level crossing and feature a finite jump at the phase transition between the confined and deconfined phases. At strong magnetic field the ground state has a massless mode corresponding to the Goldstone boson associated with the spontaneously broken U(1) R-symmetry analogous to the eta' meson in QCD.

Veselin G. Filev; Matthias Ihl

2014-06-22T23:59:59.000Z

211

On convergence of an iterative technique for solution of the implicit relationship between variables in the equations for moist convection  

E-Print Network [OSTI]

N)+M+ Sa (37) (3) a a (O) e a (O) and D) (3S~ R~ R~ ) Ds + (Ss 38~ R~ ) D) + (Ry M + Sr N)+N+ Sa (38) Ifn=3 Dq ? (Sg -6S R +Rq) Dq ? (4S~R~ - 4Sa R') D) + ~(Sj R~)M (2SyR~)N] + (SyM RyN) + M + Sa (39) and 12 D~ = (4SI3RI - I R ) Dk + (Sl ? 6SIRj... CONTINUE )rR I TE ( 6 r 9) I rRR ~ R ( rFC( I ) 9 FORFAT (Tier 'DR( ' r IZr ) r T3lrEl ~ 6 r(R ( TE (6 ~ I I ) I r IF, ( I, IC ( ( ) ll FOR& AT(Tle, rn I(' l2, ') ', T31, El4. 6, T6l, f14. 6, T9[, E14. 6) 200 CONTINUE 119o CONT(NUE RETURN ENO FUNCT...

Perry, Richard Allan

2012-06-07T23:59:59.000Z

212

Testing the AdS/CFT Correspondence  

SciTech Connect (OSTI)

This lecture begins with some history and basic facts about string theory and its connections with strong interactions. Comparisons of stacks of Dirichlet branes with curved backgrounds produced by them are used to motivate the AdS/CFT correspondence between superconformal gauge theory and string theory on a product of Anti-de Sitter space and a compact manifold. The ensuing duality between semi-classical spinning strings and long gauge theory operators is briefly reviewed. We go on to describe a recent test of the AdS/CFT correspondence using the Wilson loop cusp anomaly as a function of the coupling, which also enters dimensions of high-spin operators. Finally, strongly coupled thermal SYM theory is explored via a black hole in 5-dimensional AdS space, which leads to explicit results for its entropy and shear viscosity.

Klebanov, Igor R. [Joseph Henry Laboratories and Princeton Center for Theoretical Science, Princeton University, Princeton, NJ 08544 (United States)

2008-07-28T23:59:59.000Z

213

Multiple jet interactions  

E-Print Network [OSTI]

Type Designation Key Direction of Traverse: A - Axial R ? Radial A CON1 N (1) (3) (2) (2) Probe Type: N - Straight, a=O' S - Slant, a=45' (3) Configuration: CON1 CON2 CON3 CON4 CONS CON6 Jets h/D X/h 8 5. 0 16 2. 5 5. 33 7. 5 8 5. 0..., h/D=8. 0 and 2 Jets, h/D=8. 0. 0. 30 SYM INFORMATION: 8 RUN 24 RCON4N X/0 40 0. 25 oo 0. 20 0. 10 0. 05 0. 00 -0 4 -0 3 -0 2 -0. 1 0 0 0. 1 0 2 0 3 0 4 TyX Fig. 24 Distribution of Turbulence Intensity for 2 Jets, b/D=16. 0. 0. 30 BYN...

Hehr, Roger James

2012-06-07T23:59:59.000Z

214

Symmetry Energy as a Function of Density and Mass  

E-Print Network [OSTI]

Energy in nuclear matter is, in practice, completely characterized at different densities and asymmetries, when the density dependencies of symmetry energy and of energy of symmetric matter are specified. The density dependence of the symmetry energy at subnormal densities produces mass dependence of nuclear symmetry coefficient and, thus, can be constrained by that latter dependence. We deduce values of the mass dependent symmetry coefficients, by using excitation energies to isobaric analog states. The coefficient systematic, for intermediate and high masses, is well described in terms of the symmetry coefficient values of a_a^V=(31.5-33.5) MeV for the volume coefficient and a_a^S=(9-12) MeV for the surface coefficient. These two further correspond to the parameter values describing density dependence of symmetry energy, of L~95 MeV and K_{sym}~25 MeV.

Pawel Danielewicz; Jenny Lee

2007-08-21T23:59:59.000Z

215

Symmetry Energy as a Function of Density and Mass  

SciTech Connect (OSTI)

Energy in nuclear matter is, in practice, completely characterized at different densities and asymmetries, when the density dependencies of symmetry energy and of energy of symmetric matter are specified. The density dependence of the symmetry energy at subnormal densities produces mass dependence of nuclear symmetry coefficient and, thus, can be constrained by that latter dependence. We deduce values of the mass dependent symmetry coefficients, by using excitation energies to isobaric analog states. The coefficient systematic, for intermediate and high masses, is well described in terms of the symmetry coefficient values of a{sub a}{sup V} = (31.5-33.5) MeV for the volume coefficient and a{sub a}{sup S} = (9-12) MeV for the surface coefficient. These two further correspond to the parameter values describing density dependence of symmetry energy, of L{approx}95 MeV and K{sub sym}{approx}25 MeV.

Danielewicz, Pawel; Lee, Jenny [National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)

2007-10-26T23:59:59.000Z

216

Symmetry Energy as a Function of Density and Mass  

E-Print Network [OSTI]

Energy in nuclear matter is, in practice, completely characterized at different densities and asymmetries, when the density dependencies of symmetry energy and of energy of symmetric matter are specified. The density dependence of the symmetry energy at subnormal densities produces mass dependence of nuclear symmetry coefficient and, thus, can be constrained by that latter dependence. We deduce values of the mass dependent symmetry coefficients, by using excitation energies to isobaric analog states. The coefficient systematic, for intermediate and high masses, is well described in terms of the symmetry coefficient values of a_a^V=(31.5-33.5) MeV for the volume coefficient and a_a^S=(9-12) MeV for the surface coefficient. These two further correspond to the parameter values describing density dependence of symmetry energy, of L~95 MeV and K_{sym}~25 MeV.

Danielewicz, Pawel

2007-01-01T23:59:59.000Z

217

Traka yon kretyen pandan vwayaj li : adaptasyon liv “Pilgrim’s Progress" / John Bunyan  

E-Print Network [OSTI]

nan syM la. »4 Li fe lekti yon I6t pasaj nan Bib la: «Moun mwen fe gras la ap viv, paske li gen konfyans nan mwen. Men, si 1 vire do 1 tounen fe bak, li p ap fe ke m kontan. »5 Levanjil esplike Kretyen paw6l la konsa: «Men sa ki rive, ou te kite... rekonpans li nan lemonn ki ap vini an.» 27 Entepret: «Ougenrezon. Bagay nou wb ak je p ap dire non. Se sa je pa we ki eten£l.»4 Le sa a nan rev la, mwen wb Ent£pr£t pran men Kretyen epi 1 mennen 1 devan yon mi, kote ki te gen yon gwo dife k ap boule...

Paultre, Carrie?; Bunyan, John; Ross, Jim D.; Freeman, Bryant C.

2000-01-01T23:59:59.000Z

218

The Low Lying Zeros of a GL(4) and a GL(6) family of L-functions  

E-Print Network [OSTI]

We investigate the large weight (k --> oo) limiting statistics for the low lying zeros of a GL(4) and a GL(6) family of L-functions, {L(s,phi x f): f in H_k(1)} and {L(s,phi times sym^2 f): f in H_k(1)}; here phi is a fixed even Hecke-Maass cusp form and H_k(1) is a Hecke eigenbasis for the space H_k(1) of holomorphic cusp forms of weight k for the full modular group. Katz and Sarnak conjecture that the behavior of zeros near the central point should be well modeled by the behavior of eigenvalues near 1 of a classical compact group. By studying the 1- and 2-level densities, we find evidence of underlying symplectic and SO(even) symmetry, respectively. This should be contrasted with previous results of Iwaniec-Luo-Sarnak for the families {L(s,f): f in H_k(1)} and {L(s,sym^2f): f in H_k(1)}, where they find evidence of orthogonal and symplectic symmetry, respectively. The present examples suggest a relation between the symmetry type of a family and that of its twistings, which will be further studied in a subsequent paper. Both the GL(4) and the GL(6) families above have all even functional equations, and neither is naturally split from an orthogonal family. A folklore conjecture states that such families must be symplectic, which is true for the first family but false for the second. Thus the theory of low lying zeros is more than just a theory of signs of functional equations. An analysis of these families suggest that it is the second moment of the Satake parameters that determines the symmetry group.

Eduardo Duenez; Steven J. Miller

2006-03-20T23:59:59.000Z

219

Comparison of SERPENT and CASMO-5M for pressurized water reactors models  

SciTech Connect (OSTI)

The objective of this work is to perform a preliminary assessment of the capability of SERPENT to generate cross sections for a PWR Beginning-of-Life (BOL) isothermal mini-core by comparing a SERPENT/PARCS solution with the results obtained using a CASMO-5M/PARCS approach. The PARCS code is used instead of the usual SIMULATE-3 to analyze the Swiss Reactors, because interfaces with PARCS already exist to obtain neutronic data from SERPENT. For the PWR configurations, the differences between CASMO-5M and SERPENT solutions are within 200 pcm at the assembly level and thus rather small when considering the deterministic transport method (energy/angular/space discretization) in CASMO-5M versus the stochastic treatment of SERPENT, the statistical uncertainties in the Monte-Carlo approach as well as the eventual differences in nuclear data used by both codes. At the 2D mini-core level, no major difference is observed when comparing PARCS run with CASMO-5M versus SERPENT cross sections. For the generation of kinetic parameters, non trivial differences are observed due both to the methods and the data used. For the relatively limited number of configurations considered, it is hard to make any definitive statement on the benefits of using Monte Carlo codes in terms of nuclear data generation. (authors)

Hursin, M.; Vasiliev, A.; Ferroukhi, H.; Pautz, A. [Paul Scherrer Institut, Nukleare Energie und Sicherheit PSI, Villigen, 5232 (Switzerland)

2013-07-01T23:59:59.000Z

220

A rich bounty of AGN in the 9 square degree Bootes survey: high-z obscured AGN and large-scale structure  

E-Print Network [OSTI]

We use observations from the 9 square degree multiwavelength survey in Bootes to identify hundreds of obscured active galactic nuclei (AGN) with high redshifts (z > 0.7), luminosities (L_bol > 10^45 ergs/s), and moderate obscuring columns (N_H > 10^22 cm^-2), and to measure the clustering properties of X-ray AGN at z > 1. In the Bootes region, shallow (5 ks) Chandra X-ray observations have detected ~4,000 X-ray sources, and the same region has been mapped with deep optical imaging and by Spitzer IRAC, which detects ~300,000 point sources, of which ~30,000 have detections in all four IRAC bands, for which we can select AGN on the basis of their mid-IR colors. With the MMT/Hectospec we have obtained modest resolution optical spectra for about half the X-ray sources (out to z > 3) and ~20,000 galaxies (out to z = 0.7). With this multiwavelength data we select >400 AGN per square degree (compared to 12 per square degree from SDSS). Among a sample of IRAC-selected AGN we identify 641 candidate obscured objects based on their R band and IRAC luminosities. We use X-ray stacking techniques to verify that they are obscured AGN and measure their absorbing column densities. We also measure the three-dimensional two-point correlation function for X-ray selected AGN.

R. C. Hickox; C. Jones; W. R. Forman; S. S. Murray; A. Kenter; M. Brodwin; the Chandra XBootes; NOAO Deep Wide-Field Survey; Spitzer IRAC Shallow Survey; AGES Teams

2006-11-21T23:59:59.000Z

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221

Microstructural evolution of U(Mo)–Al(Si) dispersion fuel under irradiation – Destructive analyses of the LEONIDAS E-FUTURE plates  

SciTech Connect (OSTI)

Several irradiation experiments have confirmed the positive effect of adding Si to the matrix of an U(Mo) dispersion fuel plate on its in-pile irradiation behavior. E-FUTURE, the first experiment of the LEONIDAS program, was performed to select an optimum Si concentration and fuel plate heat treatment parameters for further qualification. It consisted of the irradiation of 4 distinct (regarding Si content and heat treatments), full size flat fuel plates in the BR2 reactor under bounding conditions (470 W/cm2 peak BOL power, approximately 70% peak burn-up). After the irradiation, the E-FUTURE plates were examined non-destructively and found to have pillowed in the highest burn-up positions. The destructive post-irradiation examination confirmed that the fuel evolves in a stable way up to a burn-up of 60%235U. Even in the deformed area (pillow) the U(Mo) fuel itself shows stable behavior and remaining matrix material was present. From the calculation of the volume fractions, the positive effect of a higher Si amount added to the matrix and the higher annealing temperature can be derived.

A. Leenaers; S. Van den Berghe; J. Van Eyken; E. Koonen; F. Charollais; P. Lemoine; Y. Calzavara; H. Guyon; C. Jarousse; D. Geslin; D. Wachs; D. Keiser; A. Robinson; G. Hofman; Y. S. Kim

2013-10-01T23:59:59.000Z

222

Comparison of Reactivity Control Systems for the Submersion Subcritical Safe Space (S and 4) Reactor  

SciTech Connect (OSTI)

This paper compares the effectiveness of two control mechanisms for the S and 4 reactor, namely: (a) rotating BeO drums with 120 deg. thin segments of enriched B{sub 4}C in the radial reflector; and (b) sliding windows in the radial reflector. Investigated are the effects of using these control mechanisms on the differential reactor control worth, power generation profiles, and spatial neutrons flux distributions is the S and 4 reactor. For both control mechanism, the radial reflector has the same dimensions and volume. Results show that the difference in reactor performance with the two control mechanisms is small. The sliding reflector configuration features slightly lower mass and power peaking, and relatively more even fission power profiles in the core. The differential control worth for the sliding reflector segments is almost constant compared to that using rotating control drums, potentially simplifying the reactor control operation. The presence of a strong neutron absorber in the rotating drums slightly decreases the amount of excess reactivity at BOL compared with the sliding reflector configuration. However, the higher rate of reactivity depletion in the S and 4 reactor with the latter may negate this advantage.

Schriener, Timothy M.; El-Genk, Mohamed S. [Institute for Space and Nuclear Power Studies and Chemical and Nuclear Engineering Dept., University of New Mexico, Albuquerque, NM 87131 (United States)

2008-01-21T23:59:59.000Z

223

The Herschel first look at protostars in the Aquila Rift  

E-Print Network [OSTI]

As part of the science demonstration phase of the Herschel mission of the Gould Belt Key Program, the Aquila Rift molecular complex has been observed. The complete ~ 3.3deg x 3.3deg imaging with SPIRE 250/350/500 micron and PACS 70/160 micron allows a deep investigation of embedded protostellar phases, probing of the dust emission from warm inner regions at 70 and 160 micron to the bulk of the cold envelopes between 250 and 500 micron. We used a systematic detection technique operating simultaneously on all Herschel bands to build a sample of protostars. Spectral energy distributions are derived to measure luminosities and envelope masses, and to place the protostars in an M_env - L_bol evolutionary diagram. The spatial distribution of protostars indicates three star-forming sites in Aquila, with W40/Sh2-64 HII region by far the richest. Most of the detected protostars are newly discovered. For a reduced area around the Serpens South cluster, we could compare the Herschel census of protostars with Spitzer res...

Bontemps, S; Konyves, V; Men'shchikov, A; Schneider, N; Maury, A; Peretto, N; Arzoumanian, D; Attard, M; Motte, F; Minier, V; Didelon, P; Saraceno, P; Abergel, A; Baluteau, J -P; Bernard, J -Ph; Cambresy, L; Cox, P; Di Francesco, J; Di Giorgo, A M; Griffin, M; Hargrave, P; Huang, M; Kirk, J; Li, J; Martin, P; Merin, B; Molinari, S; Olofsson, G; Pezzuto, S; Prusti, T; Roussel, H; Russeil, D; Sauvage, M; Sibthorpe, B; Spinoglio, L; Testi, L; Vavrek, R; Ward-Thompson, D; White, G; Wilson, C; Woodcraft, A; Zavagno, A

2010-01-01T23:59:59.000Z

224

Observational constraints on growth of massive black holes  

E-Print Network [OSTI]

We study the observational constraints on the growth of massive black holes (BHs) in galactic nuclei. We use the velocity dispersions of early-type galaxies obtained by the SDSS and the relation between BH mass and velocity dispersion to estimate the local BH mass density to be 2.5x10^5 Msun/Mpc^3. We also use the QSO luminosity function from the 2dF Redshift Survey to estimate the BH mass density accreted during optically bright QSO phases. The local BH mass density is consistent with the density accreted during optically bright QSO phases if QSOs have an efficiency 0.1. By studying the continuity equation for the BH mass distribution, including the effect of BH mergers, we find relations between the local BH mass function and the QSO luminosity function. If the BH mass is assumed to be conserved during BH mergers, comparison of the predicted relations with the observations suggests that luminous QSOs (L_{bol}>10^{46} erg/s) have a high efficiency (e.g. 0.2), and the growth of high-mass BHs (>10^8 Msun) comes mainly from accretion during optically bright QSO phases, or that luminous QSOs have a super-Eddington luminosity. If luminous QSOs are not accreting with super-Eddington luminosities and the growth of low-mass BHs also occurs mainly during optically bright QSO phases, less luminous QSOs must accrete with a low efficiency 0.1.

Qingjuan Yu; Scott Tremaine

2002-05-16T23:59:59.000Z

225

X-ray Emission from the Weak-lined T Tauri Binary System KH 15D  

E-Print Network [OSTI]

The unique eclipsing, weak-lined T Tauri star KH 15D has been detected as an X-ray source in a 95.7 ks exposure from the Chandra X-ray Observatory archives. A maximum X-ray luminosity of 1.5 x 10^{29} erg s$^{-1}$ is derived in the 0.5--8 keV band, corresponding to L_{X}/L_bol = 7.5 x 10^{-5}. Comparison with samples of stars of similar effective temperature in NGC 2264 and in the Orion Nebula Cluster shows that this is about an order of magnitude low for a typical star of its mass and age. We argue that the relatively low luminosity cannot be attributed to absorption along the line of sight but implies a real deficiency in X-ray production. Possible causes for this are considered in the context of a recently proposed eccentric binary model for KH 15D. In particular, we note that the visible component rotates rather slowly for a weak-lined T Tauri star and has possibly been pseudosynchronized by tidal interaction with the primary near periastron.

William Herbst; Edward C. Moran

2005-06-08T23:59:59.000Z

226

THE NEARBY, YOUNG, ISOLATED, DUSTY STAR HD 166191  

SciTech Connect (OSTI)

We report an in-depth study of the F8-type star HD 166191, identified in an ongoing survey for stars exhibiting infrared emission above their expected photospheres in the Wide-field Infrared Survey Explorer all-sky catalog. The fractional IR luminosity measured from 3.5 to 70 ?m is exceptionally high (L{sub IR}/L{sub bol} ? 10%). Near-diffraction-limited imaging observations with the T-ReCS Si filter set on the Gemini South telescope and adaptive optics imaging with the NIRC2 Lp filter on the Keck II telescope confirmed that the excess emission coincides with the star. Si-band images show a strong solid-state emission feature at ?10 ?m. Theoretical evolutionary isochrones and optical spectroscopic observations indicate a stellar age in the range 10-100 Myr. The large dust mass seen in HD 166191's terrestrial planet zone is indicative of a recent collision between planetary embryos or massive ongoing collisional grinding associated with planet building.

Schneider, Adam; Song, Inseok; Hufford, Tara [Department of Physics and Astronomy, University of Georgia, Athens, GA 30602 (United States); Melis, Carl [Center for Astrophysics and Space Sciences, University of California, San Diego, CA 92093 (United States); Zuckerman, B. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Bessell, Mike [Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611 (Australia); Hinkley, Sasha, E-mail: aschneid@physast.uga.edu, E-mail: song@physast.uga.edu, E-mail: tara@physast.uga.edu, E-mail: cmelis@ucsd.edu, E-mail: ben@astro.ucla.edu, E-mail: bessell@mso.anu.edu.au, E-mail: shinkley@astro.caltech.edu [Department of Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States)

2013-11-01T23:59:59.000Z

227

Near-Infrared Adaptive Optics Imaging of the Central Regions of Nearby Sc Galaxies: I. M33  

E-Print Network [OSTI]

Near-infrared images obtained with the Canada-France-Hawaii Telescope (CFHT) Adaptive Optics Bonnette (AOB) are used to investigate the stellar content within 18 arcsec of the center of the Local Group spiral galaxy M33. AGB stars with near-infrared spectral-energy distributions similar to those of giants in the solar neighborhood and Baade's Window are detected over most of the field. The bolometric luminosity function (LF) of these stars has a discontinuity near M_{bol} = -5.25, and comparisons with evolutionary tracks suggest that most of the AGB stars formed in a burst of star formation 1 - 3 Gyr in the past. The images are also used to investigate the integrated near-infrared photometric properties of the nucleus and the central light concentration. The nucleus is bluer than the central light concentration, in agreement with previous studies at visible wavelengths. The CO index of the central light concentration 0.5 arcsec from the galaxy center is 0.05, which corresponds to [Fe/H] = -1.2 for simple stellar systems. Hence, the central light concentration could not have formed from the chemically-enriched material that dominates the present-day inner disk of M33.

T. J. Davidge

1999-10-18T23:59:59.000Z

228

V and I Photometry of Bright Giants in the Central Regions of NGC 147  

E-Print Network [OSTI]

Deep V and I CCD images with sub-arcsec spatial resolution are used to investigate the stellar content of the central regions of the Local Group dwarf elliptical galaxy NGC147. Red giant branch (RGB) stars are resolved over the entire field, and the RGB-tip occurs at I ~ 20.5, suggesting that the distance modulus is 24.3. A comparison with globular cluster sequences indicates that the center of NGC147 is moderately metal-poor, with [Fe/H] ~ -1. This is not significantly different from what was found in the outer regions of the galaxy by Mould, Kristian & Da Costa (1983, ApJ, 270, 471). Moreover, the width of the V-I color distribution at I = 21.0 indicates that a spread in metallicity is present, with sigma[Fe/H] ~ +/- 0.3. There is no evidence of a component more metal-poor than [Fe/H] ~ -1.3. A small population of moderately bright asymptotic giant branch (AGB) stars has also been detected, and the AGB-tip occurs near M{bol} ~ -5.0, indicating that an intermediate-age population is present. It is estimated that the intermediate-age population contributes ~ 2-3% of the V light from NGC147.

T. J. Davidge

1994-10-13T23:59:59.000Z

229

Spitzer Detection of PAH and Silicate Dust Features in the Mid-Infrared Spectra of z~2 Ultraluminous Infrared Galaxies  

E-Print Network [OSTI]

We report the initial results from a Spitzer GO-1 program to obtain low resolution, mid-infrared spectra of infrared luminous galaxies at z~1-2. This paper presents the spectra of eight sources observed with the Spitzer InfraRed Spectrograph (IRS). Of the eight spectra, six have mid-IR spectral features, either emission from Polycyclic Aromatic Hydrocarbon (PAH) or silicate absorption. Based on these mid-IR features, the inferred six redshifts are in the range of 1.8-2.6. The remaining two spectra detect only strong continua, thus do not yield redshift information. Strong, multiple PAH emission features are detected in two sources, and weak PAH emission in another two. These data provide direct evidence that PAH molecules are present and directly observable in ULIRGs at z~2. The six sources with measured redshifts are dusty, infrared luminous galaxies at z~2 with estimated $L_{bol} \\sim 10^{13}L_\\odot$. Of the eight sources, two appear starburst dominated; two with only power law continua are probably type I QSOs; and the remaining four are likely composite systems containing a buried AGN and a starburst component. Since half of our sample are optically faint sources with R>25.5mag (Vega), our results demonstrate the potential of using mid-infrared spectroscopy, especially the Aromatic and silicate features produced by dust grains to directly probe optically faint and infrared luminous populations at high redshift.

Lin Yan; R. Chary; L. Armus; H. Teplitz; G. Helou; D. Frayer; D. Fadda; J. Surace; P. Choi

2005-04-14T23:59:59.000Z

230

First 450-micron dust continuum mapping of the massive star-forming region NGC 3576 with the P-ArTeMiS bolometer camera  

E-Print Network [OSTI]

Context: The earliest phases of massive star formation are currently much debated. Aims. In an effort to make progress, we took a census of Class0-like protostellar dense cores in the NGC 3576 region, one of the nearest and most luminous embedded sites of high-mass star formation in the Galaxy. Methods: We used the P-ArTeMiS bolometer camera on the APEX telescope to produce the first 450-micron dust continuum map of the filamentary dense clump associated with NGC 3576. Results: Combining our 450-micron observations with existing data at other wavelengths, we have identified seven massive protostellar sources along the NGC 3576 filament and placed them in the M_env - L_bol evolutionary diagram for protostars. Conclusions: Comparison with theoretical evolutionary tracks suggests that these seven protostellar sources will evolve into massive stars with masses M* ~ 15-50 Msun. Four sources are classified as candidate high-mass Class 0 objects, two sources as massive Class I objects, and one source appears to be at an intermediate stage.

P. André; V. Minier; P. Gallais; V. Reveret; J. Le Pennec; L. Rodriguez; O. Boulade; E. Doumayrou; D. Dubreuil; M. Lortholary; J. Martignac; M. Talvard; C. De Breuck; G. Hamon; N. Schneider; S. Bontemps; P. O. Lagage; E. Pantin; H. Roussel; M. Miller; C. R. Purcell; T. Hill; J. Stutzki

2008-09-23T23:59:59.000Z

231

SMA and Spitzer Observations of Bok Glouble CB17: A Candidate First Hydrostatic Core?  

E-Print Network [OSTI]

We present high angular resolution SMA and Spitzer observations toward the Bok globule CB17. SMA 1.3mm dust continuum images reveal within CB17 two sources with an angular separation of about 21" (about 5250 AU at a distance of 250 pc). The northwestern continuum source, referred to as CB17 IRS, dominates the infrared emission in the Spitzer images, drives a bipolar outflow extending in the northwest-southeast direction, and is classified as a low luminosity Class0/I transition object (L_bol ~ 0.5 L_sun). The southeastern continuum source, referred to as CB17 MMS, has faint dust continuum emission in the SMA 1.3mm observations (about 6 sigma detection; ~3.8 mJy), but is not detected in the deep Spitzer infrared images at wavelengths from 3.6 to 70 micron. Its bolometric luminosity and temperature, estimated from its spectral energy distribution, are less than 0.04 L_sun and 16 K, respectively. The SMA CO(2-1) observations suggest that CB17 MMS may drive a low-velocity molecular outflow (about 2.5 km/s), exten...

Chen, Xuepeng; Dunham, Michael M; Zhang, Qizhou; Bourke, Tyler L; Launhardt, Ralf; Schmalzl, Markus; Henning, Thomas

2012-01-01T23:59:59.000Z

232

The identification of z-dropouts in Pan-STARRS1: three quasars at 6.5  

E-Print Network [OSTI]

Luminous distant quasars are unique probes of the high redshift intergalactic medium (IGM) and of the growth of massive galaxies and black holes in the early universe. Absorption due to neutral Hydrogen in the IGM makes quasars beyond a redshift of z~6.5 very faint in the optical $z$-band, thus locating quasars at higher redshifts require large surveys that are sensitive above 1 micron. We report the discovery of three new z>6.5 quasars, corresponding to an age of the universe of 6.5 quasars from 4 to 7. The quasars have redshifts of z=6.50, 6.52, and 6.66, and include the brightest z-dropout quasar reported to date, PSO J036.5078+03.0498 with M_1450=-27.4. We obtained near-infrared spectroscopy for the quasars and from the MgII line we estimate that the central black holes have masses between 5x10^8 and 4x10^9 M_sun, and are accreting close to the Eddington limit (L_Bol/L_Edd=0.13-1.2). We investigate the ionized regions around the quasars and find near zone radii of R_NZ=1.5-5.2 proper Mpc, confirming the t...

Venemans, B P; Decarli, R; Farina, E P; Walter, F; Chambers, K C; Fan, X; Rix, H-W; Schlafly, E; McMahon, R G; Simcoe, R; Stern, D; Burgett, W S; Draper, P W; Flewelling, H; Hodapp, K W; Kaiser, N; Magnier, E A; Metcalfe, N; Morgan, J S; Price, P A; Tonry, J L; Waters, C; AlSayyad, Y; Banerji, M; Chen, S S; González-Solares, E A; Greiner, J; Mazzucchelli, C; McGreer, I; Miller, D R; Reed, S; Sullivan, P W

2015-01-01T23:59:59.000Z

233

Strategic forces: Future requirements and options  

SciTech Connect (OSTI)

In the wake of the collapse of the Warsaw Pact and the apparent ending of the Cold War, there have been renewed calls for radical cuts in US strategic forces to levels far below the 10,000 or so warheads allowed each side under the current START proposal. Since it now appears that NATO for the first time will have the capability to defeat a Soviet conventional attack without the necessity of threatening to resort to nuclear weapons, this should pave the way for the rethinking of US strategy and the reduction of US strategic weapons requirements. In this new environment, it seems plausible that, with a modification of the Flexible Response doctrine to forego attempts to disarm the Soviet Union, deterrence could be maintained with 1500 or so survivable strategic weapons. With a new strategy that confined US strategic weapons to the role of deterring the use of nuclear weapons by other countries, a survivable force of about 500 weapons would seem sufficient. With this premise, the implications for the US strategic force structure are examined for two cases: a treaty that allows each side 3000 warheads and one that allows each side 1000 warheads. In Part 1 of this paper, the weapons requirements for deterrence are examined in light of recent changes in the geopolitical environment. In Part 2, it is assumed that the President and Congress have decided that deep cuts in strategic forces are acceptable. 128 refs., 12 figs., 12 tabs. (JF)

Speed, R.D.

1990-11-01T23:59:59.000Z

234

Committee on the Challenges of Modern Society solar energy pilot study. First follow-up report, October 1979, pilot country: United States; co-pilot countries: Denmark and France. CCMS report No. 110  

SciTech Connect (OSTI)

During 1973 to 1978, over twenty nations participated in the NATO/CCMS Solar Energy Pilot Study, whose objective was to promote and accelerate the use of solar heating and cooling of buildings. The activities in this information exchange included (1) the regular reporting of national solar heating and cooling programs, (2) the development of a format for reporting the performance of solar heating and cooling systems, (3) the exchange of system performance reports, (4) the establishment of two specialized working groups for solar-assisted low energy dwellings and passive solar applications. At the conclusion of the pilot study in 1978, the participants formulated recommendations for continued action at the international level, as well as for action at the national level. This report describes the progress made in implementing those recommendations. In addition to detailing the steps taken to continue collaboration in various efforts initiated within the Solar Energy Pilot Study, the report contains papers on the 1979 status of the solar heating and cooling programs in seventeen CCMS countries.

None

1980-01-01T23:59:59.000Z

235

Design and implementation of a Synthetic Aperture Radar for Open Skies (SAROS) aboard a C-135 aircraft  

SciTech Connect (OSTI)

NATO and former Warsaw Pact nations have agreed to allow overflights of their countries in the interest of easing world tension. The United States has decided to implement two C-135 aircraft with a Synthetic Aperture Radar (SAR) that has a 3-meter resolution. This work is being sponsored by the Defense Nuclear Agency (DNA) and will be operational in Fall 1995. Since the SAR equipment must be exportable to foreign nations, a 20-year-old UPD-8 analog SAR system was selected as the front-end and refurbished for this application by Loral Defense Systems. Data processing is being upgraded to a currently exportable digital design by Sandia National Laboratories. Amplitude and phase histories will be collected during these overflights and digitized on VHS cassettes. Ground stations will use reduction algorithms to process the data and convert it to magnitude-detected images for member nations. System Planning Corporation is presently developing a portable ground station for use on the demonstration flights. Aircraft integration into the C-135 aircraft is being done by the Air Force at Wright-Patterson AFB, Ohio.

Cooper, D.W.; Murphy, M. [Sandia National Labs., Albuquerque, NM (United States); Rimmel, G. [Loral Defense Systems, Litchfield, AZ (United States)

1994-08-01T23:59:59.000Z

236

A look behind the arms control agenda at the US-Russian and Sino-US summits  

SciTech Connect (OSTI)

When President Bill Clinton met in New York with Russian President Boris Yeltsin on October 23 and Chinese President Jiang Zemin the following day, the leaders discussed a broad spectrum of arms control issues-including START II ratification, limits on Russian conventional weapons in the Caucasus, the nuclear test ban treaty, nuclear exports to Iran and NATO expansion. The crisis in Bosnia, however, dominated the administration`s pre- and post-summit briefings as well as the media`s coverage of the meetings. On October 20, the Arms Control Association (ACA) held a news conference to highlight the key arms control issues involved in the two sets of talks. Because these vital national security issues were virtually ignored by the press, the ACA press briefing remains the most comprehensive coverage of the full range of issues that were, in fact, addressed at the mini-summits. Panel speakers included Spurgeon M. Keeny, Jr., ACA president and executive director and former deputy director of the Arms Control and Disarmament Agency; Jack Mendelsohn, ACA deputy director and a former member of the US SALT II and START I delegations; Stanley Resor, ACA board chairman and former chief US delegate to the Mutual and Balanced Force Reduction talks, former defense undersecretary for policy and former secretary of the Army; and William Dircks, director of the Atlantic Council`s Program on Nuclear Policy and former deputy director general of the International Atomic Energy Agency. Extended excerpts from their remarks follow.

NONE

1995-11-01T23:59:59.000Z

237

Studies of fluctuation processes in nuclear collisions. Progress report, March 1, 1993--April 30, 1994  

SciTech Connect (OSTI)

This report summarizes the progress on grant No.FG05-89ER40530 during the period March 1, 1993 to April 30, 1994. By extending our previous work on the fluid dynamical treatment of the nuclear collective motion, we deduced from the Boltzmann-Langevin (BL) model a set of transport equations for N collective variables and calculated the associated transport coefficients. Work has also continued on investigating the relation between the BUU model and the BL model for the average evolution. The principle investigator spent a fruitful summer (1993) at LBL, where in collaboration with J. Raindrop, we developed a numerical method for simulating the stochastic evolution of the phase-space density near local equilibrium. Two papers have appeared in Phys. Rev. C and Nucl. Phys. A, two papers have been accepted for publication, both in Nucl. Phys. A, and two manuscripts have been submitted to Z. Phys. A for publication. Several seminars/contributed talks were given at various meetings and an invited talk was presented at the NATO Advanced Study Institution Hot and Dense Matter, Bodrum/Turkey.

Ayik, S.

1994-05-01T23:59:59.000Z

238

IEA Energy conservation in the iron and steel industry. [US and Western Europe  

SciTech Connect (OSTI)

The NATO Committee on the Challenges of Modern Society research program, under the auspices of the IEA, had the objectives of collecting data on material requirements and energy-consumption patterns in selected energy-intensive industries in the US and Western Europe, of identifying technologies and operating practices with the potential for energy conservation in those industries, and of recommending research projects that could lead to improved energy efficiency. The steel industry was selected for analysis and ideas for an international cooperative program were developed. Representatives from various countries conducted meetings and the form of an implementing agreement for a research and development program was finalized in December, 1980. The program includes three technical areas: hot-surface inspection, heat recovery, and coal gasification. Hot-surface inspection methods to be demonstrated are: optical, induction, electromagnetic ultrasonic, electromagnetic ultrasonic surface testing methods, and eddy current method for hot surface inspection and an infrared system (possibly). Three heat-recovery projects are: ceramic heat wheel development; demonstration of granular bed/heat pipe system for heat recovery; and demonstration of tubular ceramic recuperators. Processes in coal gasification are: converter process, gas treatment, and iron treatment. Each project is described in detail. (MCW)

Tunnah, B.G.

1981-01-01T23:59:59.000Z

239

Recovery Act: Web-based CO{sub 2} Subsurface Modeling  

SciTech Connect (OSTI)

The Web-based CO{sub 2} Subsurface Modeling project focused primarily on extending an existing text-only, command-line driven, isothermal and isobaric, geochemical reaction-transport simulation code, developed and donated by Sienna Geodynamics, into an easier-to-use Web-based application for simulating long-term storage of CO{sub 2} in geologic reservoirs. The Web-based interface developed through this project, publically accessible via URL http://symc.sdsu.edu/, enables rapid prototyping of CO{sub 2} injection scenarios and allows students without advanced knowledge of geochemistry to setup a typical sequestration scenario, invoke a simulation, analyze results, and then vary one or more problem parameters and quickly re-run a simulation to answer what-if questions. symc.sdsu.edu has 2x12 core AMD Opteron™ 6174 2.20GHz processors and 16GB RAM. The Web-based application was used to develop a new computational science course at San Diego State University, COMP 670: Numerical Simulation of CO{sub 2} Sequestration, which was taught during the fall semester of 2012. The purpose of the class was to introduce graduate students to Carbon Capture, Use and Storage (CCUS) through numerical modeling and simulation, and to teach students how to interpret simulation results to make predictions about long-term CO{sub 2} storage capacity in deep brine reservoirs. In addition to the training and education component of the project, significant software development efforts took place. Two computational science doctoral and one geological science masters student, under the direction of the PIs, extended the original code developed by Sienna Geodynamics, named Sym.8. New capabilities were added to Sym.8 to simulate non-isothermal and non-isobaric flows of charged aqueous solutes in porous media, in addition to incorporating HPC support into the code for execution on many-core XSEDE clusters. A successful outcome of this project was the funding and training of three new computational science students and one geological science student in technologies relevant to carbon sequestration and problems involving flow in subsurface media. The three computational science students are currently finishing their doctorial studies on different aspects of modeling CO{sub 2} sequestration, while the geological science student completed his master’s thesis in modeling the thermal response of CO{sub 2} injection in brine and, as a direct result of participation in this project, is now employed at ExxonMobil as a full-time staff geologist.

Paolini, Christopher; Castillo, Jose

2012-11-30T23:59:59.000Z

240

PS1-10bzj: A FAST, HYDROGEN-POOR SUPERLUMINOUS SUPERNOVA IN A METAL-POOR HOST GALAXY  

SciTech Connect (OSTI)

We present observations and analysis of PS1-10bzj, a superluminous supernova (SLSN) discovered in the Pan-STARRS Medium Deep Survey at a redshift z = 0.650. Spectroscopically, PS1-10bzj is similar to the hydrogen-poor SLSNe 2005ap and SCP 06F6, though with a steeper rise and lower peak luminosity (M{sub bol} {approx_equal} -21.4 mag) than previous events. We construct a bolometric light curve, and show that while PS1-10bzj's energetics were less extreme than previous events, its luminosity still cannot be explained by radioactive nickel decay alone. We explore both a magnetar spin-down and circumstellar interaction scenario and find that either can fit the data. PS1-10bzj is located in the Extended Chandra Deep Field South and the host galaxy is imaged in a number of surveys, including with the Hubble Space Telescope. The host is a compact dwarf galaxy (M{sub B} Almost-Equal-To -18 mag, diameter {approx}< 800 pc), with a low stellar mass (M{sub *} Almost-Equal-To 2.4 Multiplication-Sign 10{sup 7} M{sub Sun }), young stellar population ({tau}{sub *} Almost-Equal-To 5 Myr), and a star formation rate of {approx}2-3 M{sub Sun} yr{sup -1}. The specific star formation rate is the highest seen in an SLSN host so far ({approx}100 Gyr{sup -1}). We detect the [O III] {lambda}4363 line, and find a low metallicity: 12 + (O/H) = 7.8 {+-} 0.2 ({approx_equal} 0.1 Z{sub Sun }). Together, this indicates that at least some of the progenitors of SLSNe come from young, low-metallicity populations.

Lunnan, R.; Chornock, R.; Berger, E.; Milisavljevic, D.; Drout, M.; Sanders, N. E.; Challis, P. M.; Czekala, I.; Foley, R. J.; Fong, W.; Kirshner, R. P.; Leibler, C.; Marion, G. H.; Narayan, G. [Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States); Huber, M. E. [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); McCrum, M.; Smartt, S. J. [Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN (United Kingdom); Rest, A. [Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218 (United States); Roth, K. C. [Gemini Observatory, 670 N. Aohoku Place, Hilo, HI 96720 (United States); Scolnic, D., E-mail: rlunnan@cfa.harvard.edu [Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218 (United States); and others

2013-07-10T23:59:59.000Z

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241

X-RAY NUCLEAR ACTIVITY IN S{sup 4}G BARRED GALAXIES: NO LINK BETWEEN BAR STRENGTH AND CO-OCCURRENT SUPERMASSIVE BLACK HOLE FUELING  

SciTech Connect (OSTI)

Stellar bars can lead to gas inflow toward the center of a galaxy and stimulate nuclear star formation. However, there is no compelling evidence on whether they also feed a central supermassive black hole: by measuring the fractions of barred active and inactive galaxies, previous studies have yielded conflicting results. In this paper, we aim to understand the lack of observational evidence for bar-driven active galactic nucleus (AGN) activity by studying a sample of 41 nearby (d < 35 Mpc) barred galaxies from the Spitzer Survey for Stellar Structure in Galaxies. We use Chandra observations to measure nuclear 2-10 keV X-ray luminosities and estimate Eddington ratios, together with Spitzer 3.6 ?m imaging to quantify the strength of the stellar bar in two independent ways: (1) from its structure, as traced by its ellipticity and boxiness, and (2) from its gravitational torque Q{sub b} , taken as the maximum ratio of the tangential force to the mean background radial force. In this way, rather than discretizing the presence of both stellar bars and nuclear activity, we are able to account for the continuum of bar strengths and degrees of AGN activity. We find nuclear X-ray sources in 31 out of 41 galaxies with median X-ray luminosity and Eddington ratio of L{sub X} = 4.3 × 10{sup 38} erg s{sup –1} and L{sub bol}/L{sub Edd} = 6.9 × 10{sup –6}, respectively, consistent with low-luminosity AGN activity. Including upper limits for those galaxies without nuclear detections, we find no significant correlation between any of the bar strength indicators and the degree of nuclear activity, irrespective of galaxy luminosity, stellar mass, Hubble type, or bulge size. Strong bars do not favor brighter or more efficient nuclear activity, implying that at least for the low-luminosity regime, supermassive black hole fueling is not closely connected to large-scale features.

Cisternas, Mauricio; Knapen, Johan H.; González-Martín, Omaira; Erroz-Ferrer, Santiago [Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife (Spain); Gadotti, Dimitri A.; Kim, Taehyun [European Southern Observatory, Casilla 19001, Santiago 19 (Chile); Díaz-García, Simón; Laurikainen, Eija; Salo, Heikki; Comerón, Sébastien; Laine, Jarkko [Division of Astronomy, Department of Physical Sciences, University of Oulu, Oulu FI-90014 (Finland); Ho, Luis C. [The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Elmegreen, Bruce G. [IBM T. J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, NY 10598 (United States); Zaritsky, Dennis; Hinz, Joannah L. [Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States); Sheth, Kartik [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Athanassoula, E.; Bosma, Albert [Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, F-13388 Marseille (France); Gil de Paz, Armando [Departamento de Astrofísica, Universidad Complutense de Madrid, E-28040 Madrid (Spain); Holwerda, Benne W., E-mail: mauricio@iac.es [European Space Agency, ESTEC, Keplerlaan 1, 2200 AG Noordwijk (Netherlands); and others

2013-10-10T23:59:59.000Z

242

Revisiting the axion bounds from the Galactic white dwarf luminosity function  

E-Print Network [OSTI]

It has been shown that the shape of the luminosity function of white dwarfs (WDLF) is a powerful tool to check for the possible existence of DFSZ-axions, a proposed but not yet detected type of weakly interacting particles. With the aim of deriving new constraints on the axion mass, we compute in this paper new theoretical WDLFs on the basis of WD evolving models that incorporate for the feedback of axions on the thermal structure of the white dwarf. We find that the impact of the axion emission into the neutrino emission can not be neglected at high luminosities ($M_{\\rm Bol}\\lesssim 8$) and that the axion emission needs to be incorporated self-consistently into the evolution of the white dwarfs when dealing with axion masses larger than $m_a\\cos^2\\beta\\gtrsim 5$ meV (i.e. axion-electron coupling constant $g_{ae}\\gtrsim 1.4\\times 10^{-13}$). We went beyond previous works by including 5 different derivations of the WDLF in our analysis. Then we have performed $\\chi^2$-tests to have a quantitative measure of the assessment between the theoretical WDLFs ---computed under the assumptions of different axion masses and normalization methods--- and the observed WDLFs of the Galactic disk. While all the WDLF studied in this work disfavour axion masses in the range suggested by asteroseismology ($m_a\\cos^2\\beta\\gtrsim 10$ meV; $g_{ae}\\gtrsim 2.8\\times 10^{-13}$) lower axion masses can not be discarded from our current knowledge of the WDLF of the Galactic Disk. A larger set of completely independent derivations of the WDLF of the galactic disk as well as a detailed study of the uncertainties of the theoretical WDLFs is needed before quantitative constraints on the axion-electron coupling constant can be made.

Marcelo M. Miller Bertolami; Brenda E. Melendez; Leandro G. Althaus; Jordi Isern

2014-10-07T23:59:59.000Z

243

X-ray emission from the planet pulsar B1257+12  

E-Print Network [OSTI]

We report the detection of the millisecond pulsar B1257+12 with the Chandra X-ray Observatory. In a 20 ks exposure we detected 25 photons from the pulsar, with energies between 0.4 and 2.0 keV, corresponding to the flux F_X=(4.4+/- 0.9)*10^{-15} ergs s^{-1} cm^{-2} in this energy range. The X-ray spectrum can be described by a power-law model with photon index Gamma = 2.8 and luminosity L_X \\approx 2.5*10^{29} ergs s^{-1} in the 0.3--8 keV band, for a plausible distance of 500 pc and hydrogen column density N_H=3*10^{20} cm^{-2}. Alternatively, the spectrum can be fitted by a blackbody model with kT ~ 0.22 keV and projected emitting area ~2000 m^2. If the thermal X-rays are emitted from two symmetric polar caps, the bolometric luminosity of the two caps is 2 L_bol ~ 3*10^{29} ergs s^{-1}. We compared our results with the data on other 30 millisecond pulsars observed in X-rays and found that the apparent X-ray efficiency of PSR B1257+12, L_X/Edot ~ 3*10^{-5} for d=500 pc, is lower than those of most of millisecond pulsars. This might be explained by an unfavorable orientation of the X-ray pulsar beam if the radiation is magnetospheric, or by strong asymmetry of polar caps if the radiation is thermal (e.g., one of the polar caps is much brighter than the other and remains invisible for most part of the pulsar period). Alternatively, it could be attributed to absorption of X-rays in circumpulsar matter, such as a flaring debris disk left over after formation of the planetary system around the pulsar.

G. G. Pavlov; O. Kargaltsev; G. P. Garmire; A. Wolszczan

2007-04-17T23:59:59.000Z

244

What Can We Learn from the Smallest AGN?  

E-Print Network [OSTI]

Quite a few things. In particular, reverberation mapping of NGC 4395, the lowest luminosity type 1 Active Galactic Nucleus (AGN, L_bol~10^40 erg/s) revealed a size of only ~1 light hour for the C IV broad line region (BLR), which is by far the smallest BLR. This, together with a similar determination of a size of ~200 light days in a luminous quasar (Kaspi et al. 2007), suggests that the R_BLR\\propto L^1/2 relation holds over a range of 10^7 in L. This relation was suggested to result from dust sublimation, which sets R_BLR. This suggestion was beautifully confirmed recently by the dust reverberation results of Suganuma et al. (2006). The R_BLR\\propto L^1/2 relation implies that the broad lines width increases with decreasing luminosity according to v\\propto L^-1/4. But, there is an observational cutoff at v~25,000 km/s, and thus below a certain threshold L the BLR would not be detectable. Such objects constitute the so-called "true type 2" AGN (e.g. most FR I radio galaxies). The physical origin of the BLR gas is not established yet, but high quality Keck spectra of the Halpha profile in NGC 4395 rule out a clumped distribution, and indicate that the gas resides in a smooth flow, most likely in a thick rotationally supported configuration. The Halpha line also reveals extended exponential wings, which are well modeled by electron scattering within the BLR emitting gas. Such wings can be used as a direct probe of the BLR temperature and optical depth.

Ari Laor

2007-02-21T23:59:59.000Z

245

High-resolution X-ray spectroscopy of Theta Car  

E-Print Network [OSTI]

Context : The peculiar hot star Theta Car in the open cluster IC2602 is a blue straggler as well as a single-line binary of short period (2.2d). Aims : Its high-energy properties are not well known, though X-rays can provide useful constraints on the energetic processes at work in binaries as well as in peculiar, single objects. Methods : We present the analysis of a 50ks exposure taken with the XMM-Newton observatory. It provides medium as well as high-resolution spectroscopy. Results : Our high-resolution spectroscopy analysis reveals a very soft spectrum with multiple temperature components (1--6MK) and an X-ray flux slightly below the `canonical' value (log[L_X(0.1-10.)/L_{BOL}] ~ -7). The X-ray lines appear surprisingly narrow and unshifted, reminiscent of those of beta Cru and tau Sco. Their relative intensities confirm the anomalous abundances detected in the optical domain (C strongly depleted, N strongly enriched, O slightly depleted). In addition, the X-ray data favor a slight depletion in neon and iron, but they are less conclusive for the magnesium abundance (solar-like?). While no significant changes occur during the XMM-Newton observation, variability in the X-ray domain is detected on the long-term range. The formation radius of the X-ray emission is loosely constrained to <5 R_sol, which allows for a range of models (wind-shock, corona, magnetic confinement,...) though not all of them can be reconciled with the softness of the spectrum and the narrowness of the lines.

Yael Naze; Gregor Rauw

2008-08-25T23:59:59.000Z

246

SELF-REGULATED SHOCKS IN MASSIVE STAR BINARY SYSTEMS  

SciTech Connect (OSTI)

In an early-type, massive star binary system, X-ray bright shocks result from the powerful collision of stellar winds driven by radiation pressure on spectral line transitions. We examine the influence of the X-rays from the wind-wind collision shocks on the radiative driving of the stellar winds using steady-state models that include a parameterized line force with X-ray ionization dependence. Our primary result is that X-ray radiation from the shocks inhibits wind acceleration and can lead to a lower pre-shock velocity, and a correspondingly lower shocked plasma temperature, yet the intrinsic X-ray luminosity of the shocks, L{sub X}, remains largely unaltered, with the exception of a modest increase at small binary separations. Due to the feedback loop between the ionizing X-rays from the shocks and the wind driving, we term this scenario as self-regulated shocks. This effect is found to greatly increase the range of binary separations at which a wind-photosphere collision is likely to occur in systems where the momenta of the two winds are significantly different. Furthermore, the excessive levels of X-ray ionization close to the shocks completely suppress the line force, and we suggest that this may render radiative braking less effective. Comparisons of model results against observations reveal reasonable agreement in terms of log (L{sub X}/L{sub bol}). The inclusion of self-regulated shocks improves the match for kT values in roughly equal wind momenta systems, but there is a systematic offset for systems with unequal wind momenta (if considered to be a wind-photosphere collision).

Parkin, E. R.; Sim, S. A., E-mail: parkin@mso.anu.edu.au, E-mail: s.sim@qub.ac.uk [Research School of Astronomy and Astrophysics, Australian National University, ACT 2611 (Australia)

2013-04-20T23:59:59.000Z

247

THE ATTRACTIVENESS OF MATERIAS ASSOCIATED WITH THORIUM-BASED NUCLEAR FUEL CYCLES FOR PHWRS  

SciTech Connect (OSTI)

This paper reports the continued evaluation of the attractiveness of materials mixtures containing special nuclear materials (SNM) associated with thorium based nuclear fuel cycles. Specifically, this paper examines a thorium fuel cycle in which a pressurized heavy water reactor (PHWR) is fueled with mixtures of natural uranium/233U/thorium. This paper uses a PHWR fueled with natural uranium as a base fuel cycle, and then compares material attractiveness of fuel cycles that use 233U/thorium salted with natural uranium. The results include the material attractiveness of fuel at beginning of life (BoL), end of life (EoL), and the number of fuel assemblies required to collect a bare critical mass of plutonium or uranium. This study indicates what is required to render the uranium as having low utility for use in nuclear weapons; in addition, this study estimates the increased number of assemblies required to accumulate a bare critical mass of plutonium that has a higher utility for use in nuclear weapons. This approach identifies that some fuel cycles may be easier to implement the International Atomic Energy Agency (IAEA) safeguards approach and have a more effective safeguards by design outcome. For this study, approximately one year of fuel is required to be reprocessed to obtain one bare critical mass of plutonium. Nevertheless, the result of this paper suggests that all spent fuel needs to be rigorously safeguarded and provided with high levels of physical protection. This study was performed at the request of the United States Department of Energy /National Nuclear Security Administration (DOE/NNSA). The methodology and key findings will be presented.

Prichard, Andrew W.; Niehus, Mark T.; Collins, Brian A.; Bathke, Charles G.; Ebbinghaus, Bartley B.; Hase, Kevin R.; Sleaford, Brad W.; Robel, Martin; Smith, Brian W.

2011-07-17T23:59:59.000Z

248

An X-ray Census of Young Stars in the Massive Southern Star-Forming Complex NGC 6357  

E-Print Network [OSTI]

We present the first high spatial resolution X-ray study of the massive star forming region NGC 6357, obtained in a 38 ks Chandra/ACIS observation. Inside the brightest constituent of this large HII region complex is the massive open cluster Pismis 24. It contains two of the brightest and bluest stars known, yet remains poorly studied; only a handful of optically bright stellar members have been identified. We investigate the cluster extent and Initial Mass Function and detect ~800 X-ray sources with a limiting sensitivity of 10^{30} ergs s^{-1}; this provides the first reliable probe of the rich intermediate-mass and low-mass population of this massive cluster, increasing the number of known members from optical study by a factor of ~50. The high luminosity end (log L_h[2-8 keV]\\ge 30.3 ergs s^{-1}) of the observed X-ray luminosity function in NGC 6357 is clearly consistent with a power law relation as seen in the Orion Nebula Cluster and Cepheus B, yielding the first estimate of NGC 6357's total cluster population, a few times the known Orion population. We investigate the structure of the cluster, finding small-scale substructures superposed on a spherical cluster with 6 pc extent, and discuss its relationship to the nebular morphology. The long-standing Lx - 10^{-7}L_{bol} correlation for O stars is confirmed. Twenty-four candidate O stars and one possible new obscured massive YSO or Wolf-Rayet star are presented. Many cluster members are estimated to be intermediate-mass stars from available infrared photometry (assuming an age of 1 Myr), but only a few exhibit K-band excess. We report the first detection of X-ray emission from an Evaporating Gaseous Globule at the tip of a molecular pillar; this source is likely a B0-B2 protostar.

Junfeng Wang; Leisa K. Townsley; Eric D. Feigelson; Konstantin V. Getman; Patrick S. Broos; Gordon P. Garmire; Masahiro Tsujimoto

2006-09-11T23:59:59.000Z

249

DETECTION OF RADIO EMISSION FROM THE HYPERACTIVE L DWARF 2MASS J13153094-2649513AB  

SciTech Connect (OSTI)

We report the detection of radio emission from the unusually active L5e + T7 binary 2MASS J13153094-2649513AB made with the Australian Telescope Compact Array. Observations at 5.5 GHz reveal an unresolved source with a continuum flux of 370 {+-} 50 {mu}Jy, corresponding to a radio luminosity of L{sub rad} = {nu}L{sub {nu}} = (9 {+-} 3) Multiplication-Sign 10{sup 23} erg s{sup -1} and log{sub 10} L{sub rad}/L{sub bol} = -5.44 {+-} 0.22. No detection is made at 9.0 GHz to a 5{sigma} limit of 290 {mu}Jy, consistent with a power-law spectrum S{sub {nu}}{proportional_to}{nu}{sup -{alpha}} with {alpha} {approx}> 0.5. The emission is quiescent, with no evidence of variability or bursts over three hours of observation, and no measurable polarization (V/I < 34%). 2MASS J1315-2649AB is one of the most radio-luminous ultracool dwarfs detected in quiescent emission to date, comparable in strength to other cool sources detected in outburst. Its detection indicates no decline in radio flux through the mid-L dwarfs. It is unique among L dwarfs in having strong and persistent H{alpha} and radio emission, indicating the coexistence of a cool, neutral photosphere (low electron density) and a highly active chromosphere (high electron density and active heating). These traits, coupled with the system's mature age and substellar secondary, make 2MASS J1315-2649AB an important test for proposed radio emission mechanisms in ultracool dwarfs.

Burgasser, Adam J.; Melis, Carl [Center for Astrophysics and Space Science, University of California San Diego, La Jolla, CA 92093 (United States); Zauderer, B. Ashley; Berger, Edo, E-mail: aburgasser@ucsd.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2013-01-01T23:59:59.000Z

250

The Resolved Stellar Populations of a Dwarf Spheroidal Galaxy in the Virgo Cluster  

E-Print Network [OSTI]

We report on the discovery of a faint (M_V ~ -10.6 +/- 0.2) dwarf spheroidal galaxy on deep F606W and F814W Hubble Space Telescope images of a Virgo intracluster field. The galaxy is easily resolved in our images, as our color magnitude diagram (CMD) extends > 1 magnitude beyond the tip of the red giant branch (RGB). Thus, it is the deepest CMD for a small dwarf galaxy inside a cluster environment. Using the colors of the RGB stars, we derive a metal abundance for the dwarf of [M/H]= -2.3 +/- 0.3, and show that the metallicity dispersion is less than 0.6 dex at 95% confidence. We also use the galaxy's lack of AGB stars and the absence of objects brighter than M_bol ~ -4.1 +/- 0.2 to show that the system is old (t >~10 Gyr). Finally, we derive the object's structural parameters, and show that the galaxy displays no obvious evidence of tidal threshing. Since the tip of the red giant branch distance ((m-M)_0 = 31.23 +/- 0.17 or D = 17.6 +/- 1.4 Mpc) puts the galaxy near the core of the Virgo cluster, one might expect the object to have undergone some tidal processing. Yet the chemical and morphological similarity between the dwarf and the dSph galaxies of the Local and M81 Group demonstrates that the object is indeed pristine, and not the shredded remains of a much larger galaxy. We discuss the possible origins of this galaxy, and suggest that it is just now falling into Virgo for the first time.

Patrick R. Durrell; Benjamin F. Williams; Robin Ciardullo; John J. Feldmeier; Ted von Hippel; Steinn Sigurdsson; George H. Jacoby; Henry C. Ferguson; Nial R. Tanvir; Magda Arnaboldi; Ortwin Gerhard; J. Alfonso L. Aguerri; Ken Freeman; Matt Vinciguerra

2006-11-06T23:59:59.000Z

251

Technicolor and Beyond: Unification in Theory Space  

E-Print Network [OSTI]

The salient features of models of dynamical electroweak symmetry breaking are reviewed. The ideal walking idea is introduced according to which one should carefully take into account the effects of the extended technicolor dynamics on the technicolor dynamics itself. The effects amount at the enhancement of the anomalous dimension of the mass of the techniquarks allowing to decouple the Flavor Changing Neutral Currents problem from the one of the generation of the top mass. Precision data constraints are reviewed focussing on the latest crucial observation that the S-parameter can be computed exactly near the upper end of the conformal window (Conformal S-parameter) with relevant consequences on the selection of nature's next strong force. We will then introduce the Minimal Walking Technicolor (MWT) models. In the second part of this review we consider the interesting possibility to marry supersymmetry and technicolor. The reason is to provide a unification of different extensions of the standard model. For example, this means that one can recover, according to the parameters and spectrum of the theory distinct extensions of the standard model, from supersymmetry to technicolor and unparticle physiscs. A surprising result is that a minimal (in terms of the smallest number of fields) supersymmetrization of the MWT model leads to the maximal supersymmetry in four dimensions, i.e. N=4 SYM.

Francesco Sannino

2010-10-18T23:59:59.000Z

252

Gravity Dual Corrections to the Heavy Quark Potential at Finite-Temperature  

E-Print Network [OSTI]

We apply gauge/gravity duality to compute $1/N^2_c$ corrections to the heavy quark potentials of a quark--anti-quark pair ($Q\\bar Q$) and of a quark--quark pair ($QQ$) immersed into the strongly coupled N = 4 SYM plasma. On the gravity side these corrections come from the exchanges of supergravity modes between two string worldsheets stretching from the UV boundary of AdS space to the black hole horizon in the bulk and smeared over $S^5$. We find that the contributions to the $Q\\bar Q$ potential coming from the exchanges of all of the relevant modes (such as dilaton, massive scalar, 2-form field, and graviton) are all attractive, leading to an attractive net $Q\\bar Q$ potential. We show that at large separations $r$ and/or high-temperature $T$ the potential is of Yukawa-type, dominated by the graviton exchange, in agreement with earlier findings. On the other hand, at small-$r T$ the $Q\\bar Q$ potential scales as $\\sim (1/r) \\ln (1/rT)$. In the case of $QQ$ potential the 2-form contribution changes sign and becomes repulsive: however, the net $QQ$ potential remains attractive. At large-$r T$ it is dominated by the graviton exchange, while at small-$r T$ the $QQ$ potential becomes Coulomb-like.

Hovhannes R. Grigoryan; Yuri V. Kovchegov

2011-06-23T23:59:59.000Z

253

Core-crust transition properties of neutron stars within systematically varied extended relativistic mean-field model  

E-Print Network [OSTI]

The model dependence and the symmetry energy dependence of the core-crust transition properties for the neutron stars are studied using three different families of systematically varied extended relativistic mean field model. Several forces within each of the families are so considered that they yield wide variations in the values of the nuclear symmetry energy $a_{\\rm sym}$ and its slope parameter $L$ at the saturation density. The core-crust transition density is calculated using a method based on random-phase-approximation. The core-crust transition density is strongly correlated, in a model independent manner, with the symmetry energy slope parameter evaluated at the saturation density. The pressure at the transition point dose not show any meaningful correlations with the symmetry energy parameters at the saturation density. At best, pressure at the transition point is correlated with the symmetry energy parameters and their linear combination evaluated at the some sub-saturation density. Yet, such correlations might not be model independent. The correlations of core-crust transition properties with the symmetry energy parameter are also studied by varying the symmetry energy within a single model. The pressure at the transition point is correlated once again with the symmetry energy parameter at the sub-saturation density.

A. Sulaksono; Naosad Alam; B. K. Agrawal

2014-11-03T23:59:59.000Z

254

Symmetry energy from nuclear multifragmentation  

E-Print Network [OSTI]

The ratio of symmetry energy coefficient to temperature $C_{sym}/T$ is extracted from different prescriptions using the isotopic as well as the isobaric yield distributions obtained in different projectile fragmentation reactions. It is found that the values extracted from our theoretical calculation agree with those extracted from the experimental data but they differ very much from the input value of the symmetry energy used. The best possible way to deduce the value of the symmetry energy coefficient is to use the fragment yield at the breakup stage of the reaction and it is better to use the grand canonical model for the fragmentation analysis. This is because the formulas that are used for the deduction of the symmetry energy coefficient are all derived in the framework of the grand canonical ensemble which is valid only at the break-up (equilibrium) condition. The yield of "cold" fragments either from the theoretical models or from experiments when used for extraction of the symmetry energy coefficient using these prescriptions might lead to the wrong conclusion.

Swagata Mallik; Gargi Chaudhuri

2013-01-23T23:59:59.000Z

255

Dissolved deconfinement: Phase Structure of large N gauge theories with fundamental matter  

E-Print Network [OSTI]

A class of large N SU(N) gauge theories on a compact manifold S^3 X R (with possible inclusion of adjoint matter) is known to show first order deconfinement transition at the deconfinement temperature. This includes the familiar example of pure YM theory and N=4 SYM theory. Here we study the effect of introduction of N_f fundamental matter fields in the phase diagram of the above mentioned gauge theories at small coupling and in the limit of large N and finite N_f/N. We find some interesting features like the termination of the line of first order deconfinement phase transition at a critical point as the ratio N_f/N is increased and absence of deconfinement transition thereafter (there is only a smooth crossover). This result may have some implication for QCD, which unlike a pure gauge theory does not show a first order deconfinement transition and only displays a smooth crossover at the transition temperature.

Pallab Basu; Anindya Mukherjee

2008-03-14T23:59:59.000Z

256

Nuclear Symmetry Energy in Relativistic Mean Field Theory  

E-Print Network [OSTI]

The Physical origin of the nuclear symmetry energy is studied within the relativistic mean field (RMF) theory. Based on the nuclear binding energies calculated with and without mean isovector potential for several isobaric chains we conform earlier Skyrme-Hartree-Fock result that the nuclear symmetry energy strength depends on the mean level spacing $\\epsilon (A)$ and an effective mean isovector potential strength $\\kappa (A)$. A detaied analysis of isospin dependence of the two components contributing to the nuclear symmetry energy reveals a quadratic dependence due to the mean-isoscalar potential, $\\sim\\epsilon T^2$, and, completely unexpectedly, the presence of a strong linear component $\\sim\\kappa T(T+1+\\epsilon/\\kappa)$ in the isovector potential. The latter generates a nuclear symmetry energy in RMF theory that is proportional to $E_{sym}\\sim T(T+1)$ at variance to the non-relativistic calculation. The origin of the linear term in RMF theory needs to be further explored.

Shufang Ban; Jie Meng; Wojciech Satula; Ramon A. Wyss

2005-09-12T23:59:59.000Z

257

Is there a tower of charges to be discovered?  

E-Print Network [OSTI]

We investigate higher loop integrability for a q-deformation of the su(2)-sector of N=4 SYM theory. First we construct a generalisation of the long range spin chain, which for the lowest orders describes the non-deformed dilatation operator. This generalised model is built up from Temperley-Lieb algebra generators and describes the deformed theory to at least two loops. When constructing the model we have demanded the existence of one commuting charge, which puts strong constraints on the parameters to three loop orders. We also write down the five first charges for this model at two loops order. Our main goal is to obtain an explicit expression for an infinite number of commuting charges, all commuting with the dilatation operator. This would imply integrability. As a step towards this goal we present in this paper an expression for a generic local charge of the one-loop dilatation operator, which happens to be a generator of the Temperley-Lieb algebra.

T. Mansson

2008-02-20T23:59:59.000Z

258

Nesting and Dressing  

E-Print Network [OSTI]

We compute the anomalous dimensions of field strength operators Tr F^L in N=4 SYM from an asymptotic nested Bethe ansatz to all-loop order. Starting from the exact solution of the one-loop problem at arbitrary L, we derive a single effective integral equation for the thermodynamic limit of these dimensions. We also include the recently proposed phase factor for the S-matrix of the planar AdS/CFT system. The terms in the effective equation corresponding to, respectively, the nesting and the dressing are structurally very similar. This hints at the physical origin of the dressing phase, which we conjecture to arise from the hidden presence of infinitely many auxiliary Bethe roots describing a non-trivial "filled" structure of the theory's BPS vacuum. We finally show that the mechanism for creating effective nesting/dressing kernels is quite generic by also deriving the integral equation for the all-loop dimension of a certain one-loop so(6) singlet state.

Adam Rej; Matthias Staudacher; Stefan Zieme

2007-03-26T23:59:59.000Z

259

Non-Planar On-Shell Diagrams  

E-Print Network [OSTI]

We initiate a systematic study of non-planar on-shell diagrams in N=4 SYM and develop powerful technology for doing so. We introduce canonical variables generalizing face variables, which make the dlog form of the on-shell form explicit. We make significant progress towards a general classification of arbitrary on-shell diagrams by means of two classes of combinatorial objects: generalized matching and matroid polytopes. We propose a boundary measurement that connects general on-shell diagrams to the Grassmannian. Our proposal exhibits two important and non-trivial properties: positivity in the planar case and it matches the combinatorial description of the diagrams in terms of generalized matroid polytopes. Interestingly, non-planar diagrams exhibit novel phenomena, such as the emergence of constraints on Plucker coordinates beyond Plucker relations when deleting edges, which are neatly captured by the generalized matching and matroid polytopes. This behavior is tied to the existence of a new type of poles in the on-shell form at which combinations of Plucker coordinates vanish. Finally, we introduce a prescription, applicable beyond the MHV case, for writing the on-shell form as a function of minors directly from the graph.

Sebastian Franco; Daniele Galloni; Brenda Penante; Congkao Wen

2015-03-17T23:59:59.000Z

260

Dynamical aspects of the plane-wave matrix model at finite temperature  

E-Print Network [OSTI]

We study dynamical aspects of the plane-wave matrix model at finite temperature. One-loop calculation around general classical vacua is performed using the background field method, and the integration over the gauge field moduli is carried out both analytically and numerically. In addition to the trivial vacuum, which corresponds to a single M5-brane at zero temperature, we consider general static fuzzy-sphere type configurations. They are all 1/2 BPS, and hence degenerate at zero temperature due to supersymmetry. This degeneracy is resolved, however, at finite temperature, and we identify the configuration that gives the smallest free energy at each temperature. The Hagedorn transition in each vacuum is studied by using the eigenvalue density method for the gauge field moduli, and the free energy as well as the Polyakov line is obtained analytically near the critical point. This reveals the existence of fuzzy sphere phases, which may correspond to the plasma-ball phases in N=4 SU(\\infty) SYM on S^1 X S^3. We also perform Monte Carlo simulation to integrate over the gauge field moduli. While this confirms the validity of the analytic results near the critical point, it also shows that the trivial vacuum gives the smallest free energy throughout the high temperature regime.

Naoyuki Kawahara; Jun Nishimura; Kentaroh Yoshida

2006-04-25T23:59:59.000Z

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261

Non-Planar On-Shell Diagrams  

E-Print Network [OSTI]

We initiate a systematic study of non-planar on-shell diagrams in N=4 SYM and develop powerful technology for doing so. We introduce canonical variables generalizing face variables, which make the dlog form of the on-shell form explicit. We present a general classification of arbitrary on-shell diagrams in terms of two classes of combinatorial objects: generalized matching and matroid polytopes. We propose a boundary measurement that connects general on-shell diagrams to the Grassmannian. Our proposal exhibits two important and non-trivial properties: positivity in the planar case and its generalization for non-planar diagrams, and it matches the combinatorial description of the diagrams in terms of matroid polytopes. We present a comprehensive discussion of equivalence and reductions for non-planar diagrams and explain how they are captured by the generalized matching and matroid polytopes. Interestingly, non-planar diagrams exhibit novel phenomena, such as the emergence of constraints on Pl\\"ucker coordinat...

Franco, Sebastian; Penante, Brenda; Wen, Congkao

2015-01-01T23:59:59.000Z

262

Modeling Three-Dimensional Shock Initiation of PBX 9501 in ALE3D  

SciTech Connect (OSTI)

A recent SMIS (Specific Munitions Impact Scenario) experimental series performed at Los Alamos National Laboratory has provided 3-dimensional shock initiation behavior of the HMX-based heterogeneous high explosive, PBX 9501. A series of finite element impact calculations have been performed in the ALE3D [1] hydrodynamic code and compared to the SMIS results to validate and study code predictions. These SMIS tests used a powder gun to shoot scaled NATO standard fragments into a cylinder of PBX 9501, which has a PMMA case and a steel impact cover. This SMIS real-world shot scenario creates a unique test-bed because (1) SMIS tests facilitate the investigation of 3D Shock to Detonation Transition (SDT) within the context of a considerable suite of diagnostics, and (2) many of the fragments arrive at the impact plate off-center and at an angle of impact. A particular goal of these model validation experiments is to demonstrate the predictive capability of the ALE3D implementation of the Tarver-Lee Ignition and Growth reactive flow model [2] within a fully 3-dimensional regime of SDT. The 3-dimensional Arbitrary Lagrange Eulerian (ALE) hydrodynamic model in ALE3D applies the Ignition and Growth (I&G) reactive flow model with PBX 9501 parameters derived from historical 1-dimensional experimental data. The model includes the off-center and angle of impact variations seen in the experiments. Qualitatively, the ALE3D I&G calculations reproduce observed 'Go/No-Go' 3D Shock to Detonation Transition (SDT) reaction in the explosive, as well as the case expansion recorded by a high-speed optical camera. Quantitatively, the calculations show good agreement with the shock time of arrival at internal and external diagnostic pins. This exercise demonstrates the utility of the Ignition and Growth model applied for the response of heterogeneous high explosives in the SDT regime.

Leininger, L; Springer, H K; Mace, J; Mas, E

2008-07-08T23:59:59.000Z

263

Modeling The Shock Initiation of PBX-9501 in ALE3D  

SciTech Connect (OSTI)

The SMIS (Specific Munitions Impact Scenario) experimental series performed at Los Alamos National Laboratory has determined the 3-dimensional shock initiation behavior of the HMX-based heterogeneous high explosive, PBX 9501. A series of finite element impact calculations have been performed in the ALE3D [1] hydrodynamic code and compared to the SMIS results to validate the code predictions. The SMIS tests use a powder gun to shoot scaled NATO standard fragments at a cylinder of PBX 9501, which has a PMMA case and a steel impact cover. The SMIS real-world shot scenario creates a unique test-bed because many of the fragments arrive at the impact plate off-center and at an angle of impact. The goal of this model validation experiments is to demonstrate the predictive capability of the Tarver-Lee Ignition and Growth (I&G) reactive flow model [2] in this fully 3-dimensional regime of Shock to Detonation Transition (SDT). The 3-dimensional Arbitrary Lagrange Eulerian hydrodynamic model in ALE3D applies the Ignition and Growth (I&G) reactive flow model with PBX 9501 parameters derived from historical 1-dimensional experimental data. The model includes the off-center and angle of impact variations seen in the experiments. Qualitatively, the ALE3D I&G calculations accurately reproduce the 'Go/No-Go' threshold of the Shock to Detonation Transition (SDT) reaction in the explosive, as well as the case expansion recorded by a high-speed optical camera. Quantitatively, the calculations show good agreement with the shock time of arrival at internal and external diagnostic pins. This exercise demonstrates the utility of the Ignition and Growth model applied in a predictive fashion for the response of heterogeneous high explosives in the SDT regime.

Leininger, L; Springer, H K; Mace, J; Mas, E

2008-07-01T23:59:59.000Z

264

Fe Emission And Ionized Excess Absorption in the Luminous Quasar 3C109 With XMM-Newton  

SciTech Connect (OSTI)

We report results from an XMM-Newton observation of the broad-line radio galaxy 3C 109 (z=0.3056). Previous ASCA data revealed the presence of a broad iron line from the accretion disc with which the XMM-Newton spectrum is fully consistent. However, although improving the ASCA constraints on the line parameters, the quality of the data is not high enough to distinguish between an untruncated accretion disc extending down to small radii close to the black hole and a scenario in which the innermost 20-30 gravitational radii are missing. For this reason, our results are model-dependent and the hard data can be modeled equally well by considering an absorption scenario in which a large column of neutral gas partially covers the X-ray continuum source. However, the absorber would have to comprise hundreds/thousands very compact clouds close to the X-ray source, which seems rather extreme a requirement. The 2-10 keV intrinsic luminosity of 3C 109 is of the order of 2-3 x 10{sup 45} erg s{sup -1} regardless of the adopted model. A recent black hole mass estimate of {approx} 2 x 10{sup 8} M{sub {circle_dot}} implies that L{sub bol}/L{sub Edd} > 1. If partial covering is excluded, the observed reflection fraction (of the order of unity), steep photon index (1.86), and Fe line equivalent width (about 100 eV) all suggest to exclude that the X-ray continuum is strongly beamed indicating that the large Eddington ratio is associated with a radiatively efficient accretion process and making it unlikely that the innermost accretion disc is replaced by a thick radiatively inefficient medium such as in advection-dominated accretion models. We also confirm previous findings on the detection of low energy absorption in excess of the Galactic value, where we find excellent agreement with previous results obtained in X-rays and at other wavelengths (optical and infrared). The better quality of the XMM-Newton data enables us to attribute the excess absorption to slightly ionized gas in the line of sight, located at the redshift of 3C 109. The most likely interpretation for the excess absorption is that the line-of-sight is grazing the obscuring torus of unified models, which is consistent with the inclination inferred from the Fe line profile (about 40{sup o}) and with the hybrid radio-galaxy/quasar nature of 3C 109.

Miniutti, Giovanni; /Cambridge U., Inst. of Astron.; Ballantyne, D.R.; /Arizona U.; Allen, S.W.; /KIPAC, Menlo Park; Fabian, A.C.; /Cambridge U., Inst. of Astron.; Ross,; /Holy Cross Coll.

2006-06-09T23:59:59.000Z

265

Improved Miscible Nitrogen Flood Performance Utilizing Advanced Reservoir Characterization and Horizontal Laterals in a Class I Reservoir - East Binger (Marchand) Unit  

SciTech Connect (OSTI)

The DOE-sponsored project at the East Binger Unit is an investigation into the benefits of reservoir characterization and horizontal wells in this particular setting of geologic and recovery method. The geologic setting is a tight (average porosity of 7% and average permeability of less than 1 millidarcy) Pennsylvanian-age sandstone at about 10,000 feet, and the recovery method is a miscible nitrogen flood. The projected oil recovery of the East Binger Unit, prior to the initiation of this project, was about 25%. Gravity segregation of nitrogen and crude oil was believed to be the principal cause of the poor sweep efficiency, and it was envisioned that with horizontal producing wells in the lower portion of the reservoir and horizontal injection wells near the top, the process could be converted from a lateral displacement process to a vertical displacement/gravity assisted process. Through the characterization and field development work completed in Budget Periods 1 and 2, Binger Operations, LLC (BOL) has developed a different interpretation of the sweep problem as well as a different approach to improving recovery. The sweep problem is now believed to be one of an areal nature, due to a combination of natural and hydraulic fracturing. Vertical wells have provided a much better economic return than have the horizontal wells. The natural and hydraulic fracturing manifests itself as a direction of higher permeability, and the flood is being converted to a line drive flood aligned with this orientation. Consistent with this concept, horizontal wells have been drilled along the line of the fracture orientation, such that hydraulic fracturing leads to 'longitudinal' fractures, in line with the wellbore. As such, the hydraulically fractured horizontal wells are not significantly different than hydraulically fractured vertical wells - save for the potential for a much longer fracture face. This Topical Report contains data from new wells, plus new and updated production, pressure, and gas analysis data that was not included in the Topical Report provided at the end of Budget Period 1. The analysis and interpretation of these data are provided in the many technical reports submitted throughout this project.

Joe Sinner

2004-06-30T23:59:59.000Z

266

SUPERNOVA 2008bk AND ITS RED SUPERGIANT PROGENITOR  

SciTech Connect (OSTI)

We have obtained limited photometric and spectroscopic data for supernova (SN) 2008bk in NGC 7793, primarily at {approx}> 150 days after explosion. We find that it is a Type II-Plateau (II-P) SN that most closely resembles the low-luminosity SN 1999br in NGC 4900. Given the overall similarity between the observed light curves and colors of SNe 2008bk and 1999br, we infer that the total visual extinction to SN 2008bk (A{sub V} = 0.065 mag) must be almost entirely due to the Galactic foreground, similar to what has been assumed for SN 1999br. We confirm the identification of the putative red supergiant (RSG) progenitor star of the SN in high-quality g'r'i' images we had obtained in 2007 at the Gemini-South 8 m telescope. Little ambiguity exists in this progenitor identification, qualifying it as the best example to date, next to the identification of the star Sk -69 Degree-Sign 202 as the progenitor of SN 1987A. From a combination of photometry of the Gemini images with that of archival, pre-SN, Very Large Telescope JHK{sub s} images, we derive an accurate observed spectral energy distribution (SED) for the progenitor. We find from nebular strong-intensity emission-line indices for several H II regions near the SN that the metallicity in the environment is likely subsolar (Z Almost-Equal-To 0.6 Z{sub Sun }). The observed SED of the star agrees quite well with synthetic SEDs obtained from model RSG atmospheres with effective temperature T{sub eff} = 3600 {+-} 50 K. We find, therefore, that the star had a bolometric luminosity with respect to the Sun of log (L{sub bol}/L{sub Sun} ) = 4.57 {+-} 0.06 and radius R{sub *} = 496 {+-} 34 R{sub Sun} at {approx}6 months prior to explosion. Comparing the progenitor's properties with theoretical massive-star evolutionary models, we conclude that the RSG progenitor had an initial mass in the range of 8-8.5 M{sub Sun }. This mass is consistent with, albeit at the low end of, the inferred range of initial masses for SN II-P progenitors. It is also consistent with the estimated upper limit on the initial mass of the progenitor of SN 1999br, and it agrees with the low initial masses found for the RSG progenitors of other low-luminosity SNe II-P.

Van Dyk, Schuyler D.; Elias-Rosa, Nancy [Spitzer Science Center/Caltech, Mailcode 220-6, Pasadena, CA 91125 (United States); Davidge, Tim J., E-mail: vandyk@ipac.caltech.edu, E-mail: tim.davidge@nrc.ca [Herzberg Institute of Astrophysics, National Research Council of Canada, Victoria, B.C., V9E 2E7 (Canada); and others

2012-01-15T23:59:59.000Z

267

Deconfinement in N=1 super Yang-Mills theory on R^3 x S^1 via dual-Coulomb gas and "affine" XY-model  

E-Print Network [OSTI]

We study finite-temperature N=1 SU(2) super Yang-Mills theory, compactified on a spatial circle of size L with supersymmetric boundary conditions. In the semiclassical small-L regime, a deconfinement transition occurs at T_c <<1/L. The transition is due to a competition between non-perturbative topological "molecules"---magnetic and neutral bion-instantons---and electrically charged W-bosons and superpartners. Compared to deconfinement in non-supersymmetric QCD(adj) arXiv:1112.6389, the novelty is the relevance of the light modulus scalar field. It mediates interactions between neutral bions (and W-bosons), serves as an order parameter for the Z_2^{L} center symmetry associated with the non-thermal circle, and explicitly breaks the electric-magnetic (Kramers-Wannier) duality enjoyed by non-supersymmetric QCD(adj) near T_c. We show that deconfinement can be studied using an effective two-dimensional gas of electric and magnetic charges with (dual) Coulomb and Aharonov-Bohm interactions, or, equivalently, via an XY-spin model with a symmetry-breaking perturbation, where each system couples to the scalar field. To study the realization of the discrete R-symmetry and the Z_2^{beta} thermal and Z_2^{L} non-thermal center symmetries, we perform Monte Carlo simulations of both systems. The dual-Coulomb gas simulations are a novel way to analyze deconfinement and provide a new venue to study the phase structure of a class of two-dimensional condensed matter models that can be mapped into dual-Coulomb gases. Our results indicate a continuous deconfinement transition, with Z_2^{L} remaining unbroken at the transition. Thus, the SYM transition appears similar to the one in SU(2) QCD(adj) arXiv:1112.6389 and is also likely to be characterized by continuously varying critical exponents.

Mohamed M. Anber; Scott Collier; Erich Poppitz; Seth Strimas-Mackey; Brett Teeple

2013-10-13T23:59:59.000Z

268

Magnetic Bion Condensation: A New Mechanism ofConfinement and Mass Gap in Four Dimensions  

SciTech Connect (OSTI)

In recent work, we derived the long distance confining dynamics of certain QCD-like gauge theories formulated on small S{sup 1} x R{sup 3} based on symmetries, an index theorem and abelian duality. Here, we give the microscopic derivation. The solution reveals a new mechanism of confinement in QCD(adj) in the regime where we have control over both perturbative and nonperturbative aspects. In particular, consider SU(2) QCD(adj) theory with 1 {le} n{sub f} {le} 4 Majorana fermions, a theory which undergoes gauge symmetry breaking at small S{sup 1}. If the magnetic charge of the BPS monopole is normalized to unity, we show that confinement occurs due to condensation of objects with magnetic charge 2, not 1. Due to index theorems, we know that such an object cannot be a two identical monopole configuration. Its net topological charge must vanish, and hence it must be topologically indistinguishable from the perturbative vacuum. We construct such objects, the magnetically charged, topologically null molecules of a BPS monopole and {bar K}{bar K} antimonopole, which we refer as magnetic bions. An immediate puzzle with this proposal is the apparent Coulomb repulsion between BPS-{bar K}{bar K} pair. An attraction which overcomes the Coulomb repulsion between the two is induced by 2n{sub f} -fermion exchange. Bion condensation is also the mechanism of confinement in N = 1 SYM on the same four-manifold. The SU(N) generalization hints a possible hidden integrability behind nonsupersymmetric QCD of affine Toda type, and allows us to analytically compute the string tensions and thicknesses. We currently do not know the extension to R{sup 4}.

Unsal, Mithat; /SLAC /Stanford U., Phys. Dept.

2007-09-25T23:59:59.000Z

269

REDUCTIONS WITHOUT REGRET: HISTORICAL PERSPECTIVES  

SciTech Connect (OSTI)

This is the first of three papers (in addition to an introductory summary) aimed at providing a framework for evaluating future reductions or modifications of the U.S. nuclear force, first by considering previous instances in which nuclear-force capabilities were eliminated; second by looking forward into at least the foreseeable future at the features of global and regional deterrence (recognizing that new weapon systems currently projected will have expected lifetimes stretching beyond our ability to predict the future); and third by providing examples of past or possible undesirable outcomes in the shaping of the future nuclear force, as well as some closing thoughts for the future. This paper examines the circumstances and consequences of the elimination of ? The INF-range Pershing II ballistic missile and Gryphon Ground-Launched Cruise Missile (GLCM), deployed by NATO under a dual-track strategy to counter Soviet intermediate-range missiles while pursuing negotiations to limit or eliminate all of these missiles. ? The Short-Range Attack Missile (SRAM), which was actually a family of missiles including SRAM A, SRAM B (never deployed), and SRAM II and SRAM T, these last two cancelled during an over-budget/behind-schedule development phase as part of the Presidential Nuclear Initiatives of 1991 and 1992. ? The nuclear-armed version of the Tomahawk Land-Attack Cruise Missile (TLAM/N), first limited to shore-based storage by the PNIs, and finally eliminated in deliberations surrounding the 2010 Nuclear Posture Review Report. ? The Missile-X (MX), or Peacekeeper, a heavy MIRVed ICBM, deployed in fixed silos, rather than in an originally proposed mobile mode. Peacekeeper was likely intended as a bargaining chip to facilitate elimination of Russian heavy missiles. The plan failed when START II did not enter into force, and the missiles were eliminated at the end of their intended service life. ? The Small ICBM (SICBM), or Midgetman, a road-mobile, single-warhead missile for which per-unit costs were climbing when it was eliminated under the PNIs. Although there were liabilities associated with each of these systems, there were also unique capabilities; this paper lays out the pros and cons for each. Further, we articulate the capabilities that were eliminated with these systems.

Swegle, J.; Tincher, D.

2013-09-09T23:59:59.000Z

270

STUDYING THE PHYSICAL DIVERSITY OF LATE-M DWARFS WITH DYNAMICAL MASSES  

SciTech Connect (OSTI)

We present a systematic study of the physical properties of late-M dwarfs based on high-quality dynamical mass measurements and near-infrared (NIR) spectroscopy. We use astrometry from Keck natural and laser guide star adaptive optics imaging to determine orbits for the late-M binaries LP 349 - 25AB (M7.5+M8), LHS 1901AB (M6.5+M6.5), and Gl 569Bab (M8.5+M9). We find that LP 349 - 25AB (M{sub tot} = 0.120{sup +0.008}{sub -0.007} M{sub sun}) is a pair of young brown dwarfs for which Lyon and Tucson evolutionary models jointly predict an age of 140 {+-} 30 Myr, consistent with the age of the Pleiades. However, at least the primary component seems to defy the empirical Pleiades lithium depletion boundary, implying that the system is in fact older (if the parallax is correct) and that evolutionary models under-predict the component luminosities for this magnetically active binary. We find that LHS 1901AB is a pair of very low-mass stars (M{sub tot} = 0.194{sup +0.025}{sub -0.021} M{sub sun}) with evolutionary model-derived ages consistent with the old age (>6 Gyr) implied by its lack of activity. Our improved orbit for Gl 569Bab results in a higher mass for this binary (M{sub tot} = 0.140{sup +0.009}{sub -0.008} M{sub sun}) compared to previous work (0.125 {+-} 0.007 M{sub sun}). We use these mass measurements along with our published results for 2MASS J2206 - 2047AB (M8+M8) to test four sets of ultracool model atmospheres currently in use. Fitting these models to our NIR integrated-light spectra provides temperature estimates warmer by {approx}250 K than those derived independently from Dusty evolutionary models given the measured masses and luminosities. We propose that model atmospheres are more likely to be the source of this discrepancy, as it would be difficult to explain a uniform temperature offset over such a wide range of masses, ages, and activity levels in the context of evolutionary models. This contrasts with the conclusion of Konopacky et al. that model-predicted masses (given input T{sub eff} and L{sub bol}) are at fault for differences between theory and observations. In addition, we find an opposite (and smaller) mass discrepancy from what they report when we adopt their model-testing approach: masses are too high rather than too low because our T{sub eff} estimates derived from fitting NIR spectra are {approx}650 K higher than their values from fitting broadband photometry alone.

Dupuy, Trent J.; Liu, Michael C.; Bowler, Brendan P. [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); Cushing, Michael C. [NASA Jet Propulsion Laboratory, 4800 Oak Grove Drive, Mail Stop 264-723, Pasadena, CA 91109 (United States); Helling, Christiane [SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS (United Kingdom); Witte, Soeren; Hauschildt, Peter [Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg (Germany)

2010-10-01T23:59:59.000Z

271

Non-nuclear power sources for deep space  

SciTech Connect (OSTI)

Electric propulsion and non-nuclear power can be used in tandem as a replacement for the current chemical booster and radioisotope thermoelectric generators now in use for deep space applications (i.e., to the asteroid belt and beyond). In current generation systems, electric propulsion is usually considered to be impractical because of the lack of high power for deep space, and non-nuclear power is thought to be impractical partly due to its high mass. However, when taken in combination, a solar powered electric upper stage can provide ample power and propulsion capability for use in deep space. Radioisotope thermoelectric generator (RTG) systems have generally been selected for missions only when other systems are absolutely unavailable. The disadvantages of radioisotopes include the need for nuclear safety as another dimension of concern in payload integration; the lack of assured availability of plutonium in the post-cold-war world; the enormous cost of plutonium-238; and the system complexity introduced by the need to continuously cool the system during the pre-launch phase. A conservative estimate for the total power for the solar array at beginning of life (BOL) may be in the range of 25 kW in order to provide 500 W continuous power at Jupiter. The availability of {approximately} 25 kW(e) in earth orbit raises the interesting possibility of coupling electric propulsion units to this free electric power. If electric propulsion is used to raise the probe from low-earth-orbit to an earth-escape trajectory, the system could actually save on low-earth orbit mass. Electric propulsion could be used by itself in a spiral trajectory orbit raising maneuver to earth escape velocity, or it could be used in conjunction with a chemical upper stage (either solid rocket or liquid), which would boost the payload to an elliptical orbit. The concept is to begin the Earth-Jupiter trip with a swing-by near the Sun close to the orbit of Venus and perhaps even closer if thermal loads can be tolerated. During the solar swing-by, much more power will be produced by the solar panels, allowing the spacecraft's velocity to be increased significantly. The outbound leg of the journey can, therefore, be made much more quickly than with the classical trajectory. For the purposes of a Jupiter mission, it is assumed that 20 km/sec total delta-v would be required. For a payload envelope of 17,304 kg, a 1,900 sec Isp capability means that 11,386 kg of propellant would have to be consumed, leaving 5,917 kg for the mass of the probe plus dry mass of the upper stage. The thruster subsystem would require 765 kg of thruster subsystem mass, and probably less. Assuming tanks, regulators and valves amount to 10% of the propellant mass (very likely a pessimistic assumption), it is possible to assign a mass of 1,150 kg for the tankage subsystem. This results in a mass allowance of at least 4,000 kg for the probe. This compares favorably with the dry mass of 1,637 kg for Galileo, for example, and suggests that more than adequate margin exists. If the payload margin is used for battery storage, flyby missions to the outer planets may be possible.

Kennel, E.B.; Tang, C.; Santarius, J.F.

1998-07-01T23:59:59.000Z

272

Nonproliferation, arms control and disarmament and extended deterrence in the new security environment  

SciTech Connect (OSTI)

With the end of the Cold War, in a dramatically changed security environment, the advances in nonnuclear strategic capabilities along with reduced numbers and roles for nuclear forces has altered the calculus of deterrence and defense, at least for the United States. For many, this opened up a realistic possibility of a nuclear-free world. It soon became clear that the initial post-Cold War hopes were exaggerated. The world did change fundamentally, but it did not become more secure and stable. In place of the old Soviet threat, there has been growing concern about proliferation and terrorism involving nuclear and other weapons of mass destruction (WMD), regional conflicts, global instability and increasingly serious new and emerging threats, including cyber attacks and attacks on satellites. For the United States at least, in this emerging environment, the political rationales for nuclear weapons, from deterrence to reassurance to alliance management, are changing and less central than during the Cold War to the security of the United States, its friends and allies. Nuclear weapons remain important for the US, but for a far more limited set of roles and missions. As the Perry-Schlesinger Commission report reveals, there is a domestic US consensus on nuclear policy and posture at the highest level and for the near term, including the continued role of nuclear arms in deterring WMD use and in reassuring allies. Although the value of nuclear weapons has declined for the United States, the value of these weapons for Russia, China and so-called 'rogue' states is seen to be rising. The nuclear logic of NATO during Cold War - the need for nuclear weapons to counter vastly superior conventional capabilities of the Soviet Union and the Warsaw Pact - is today heard from Russians and even some proliferants. Moreover, these weapons present a way for rogues to achieve regional hegemony and possibly to deter interventions by the United States or others. While the vision of a nuclear-free world is powerful, both existing nuclear powers and proliferators are unlikely to forego nuclear weapons entirely in a world that is dangerous and uncertain. And the emerging world would not necessarily be more secure and stable without nuclear weapons. Even if nuclear weapons were given up by the United States and other nuclear-weapon states, there would continue to be concerns about the proliferation of nuclear, chemical and biological weapons, which would not disappear and could worsen. WMD terrorism would remain a concern that was largely unaffected by US and other nuclear-weapon decisions. Conventional capabilities would not disappear and the prospects for warfare could rise. In addition, new problems could arise if rogue states or other non-status-quo powers attempted to take advantage of moves toward disarmament, while friends and allies who are not reassured as in the past could reconsider their options if deterrence declined. To address these challenges, non- and counter-proliferation and counterterrorismincluding defenses and consequence management-are priorities, especially in light of an anticipated 'renaissance' in civil nuclear power. The current agenda of the United States and others includes efforts to: (1) Strengthen International Atomic Energy Agency (IAEA) and its safeguards system; (2) Strengthen export controls, especially for sensitive technologies, by limiting the development of reprocessing and enrichment technologies and by requiring the Additional Protocol as a condition of supply; (3) Establish a reliable supply regime, including the possibility of multilateral or multinational ownership of fuel cycle facilities, as a means to promote nuclear energy without increasing the risks of proliferation or terrorism; (4) Implement effectively UN Security Council Resolution 1540; and (5) Strengthen and institutionalize the Proliferation Security Initiative and the Global Initiative to Combat Nuclear Terrorism. These and other activities are important in themselves, and are essential to maintaining and strengthening the Nonproliferati

Pilat, Joseph F [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

273

Advanced Gas Turbine Systems Research, Technical Quarterly Progress Report. October 1, 1998--December 31, 1998  

SciTech Connect (OSTI)

Major accomplishments during this reporting period by the Advanced Gas Turbine Systems Research (AGTSR) are: AGTSR submitted FY99 program continuation request to DOE-FETC for $4M; AGTSR submitted program and workshop Formation to the Collaborative Advanced Gas Turbine (CAGT) initiative; AGTSR distributed research accomplishment summaries to DOE-FETC in the areas of combustion, aero-heat transfer, and materials; AGTSR reviewed and cleared research papers with the IRB from Arizona State, Cornell, Wisconsin, Minnesota, Pittsburgh, Clemson, Texas and Georgia Tech; AGTSR prepared background material for DOE-FETC on three technology workshops for distribution at the DOE-ATS conference in Washington, DC; AGTSR coordinated two recommendations for reputable firms to conduct an economic impact analysis in support of new DOE gas turbine initiatives; AGTSR released letters announcing the short-list winners/non-winners from the 98RFP solicitation AGTSR updated fact sheet for 1999 and announced four upcoming workshops via the SCIES web page AGTSR distributed formation to EPRI on research successes, active university projects, and workshop offerings in 1999 AGTSR continued to conduct telephone debriefings to non-winning PI's born the 98RFP solicitation AGTSR distributed completed quarterly progress report assessments to the IRB experts in the various technology areas AGTSR provided Formation to GE-Evandale on the active combustion control research at Georgia Tech AGTSR provided information to AlliedSignal and Wright-Pat Air Force Base on Connecticut's latest short-listed proposal pertaining to NDE of thermal barrier coatings AGTSR submitted final technical reports from Georgia Tech - one on coatings and the other on active combustion control - to the HU3 for review and evaluation AGTSR coordinated the format, presentation and review of 28 university research posters for the ATS Annual Review Meeting in November, 1998 AGTSR published a research summary paper at the ATS Annual Review pertaining to the university consortium's activities AGTSR published and presented a paper on the status of ATS catalytic combustion R&D at the RTA/NATO Gas Turbine Combustion Symposium, October 12-16,1998 in Lisbon, Portugal IRE approved a 12-month add-on request from Penn State University to conduct an added research task in their multistage unsteady aerodynamics project AGTSR reviewed a research extension white paper from Clemson University with the IRB to conduct an added task pertaining to their mist/steam cooling research project AGTSR coordinated new research topics with the IR.Band select universities to facilitate R&D roadmapping needs at the Aero-Heat Transfer III workshop in Austin, TX AGTSR distributed FY97 research progress reports to DOE and the XRB; and AGTSR solicited new R&D topics from the IRB experts for the 1999 RFP.

NONE

1999-01-19T23:59:59.000Z

274

Storage and turnover of organic matter in soil  

SciTech Connect (OSTI)

Historically, attention on soil organic matter (SOM) has focused on the central role that it plays in ecosystem fertility and soil properties, but in the past two decades the role of soil organic carbon in moderating atmospheric CO{sub 2} concentrations has emerged as a critical research area. This chapter will focus on the storage and turnover of natural organic matter in soil (SOM), in the context of the global carbon cycle. Organic matter in soils is the largest carbon reservoir in rapid exchange with atmospheric CO{sub 2}, and is thus important as a potential source and sink of greenhouse gases over time scales of human concern (Fischlin and Gyalistras 1997). SOM is also an important human resource under active management in agricultural and range lands worldwide. Questions driving present research on the soil C cycle include: Are soils now acting as a net source or sink of carbon to the atmosphere? What role will soils play as a natural modulator or amplifier of climatic warming? How is C stabilized and sequestered, and what are effective management techniques to foster these processes? Answering these questions will require a mechanistic understanding of how and where C is stored in soils. The quantity and composition of organic matter in soil reflect the long-term balance between plant carbon inputs and microbial decomposition, as well as other loss processes such as fire, erosion, and leaching. The processes driving soil carbon storage and turnover are complex and involve influences at molecular to global scales. Moreover, the relative importance of these processes varies according to the temporal and spatial scales being considered; a process that is important at the regional scale may not be critical at the pedon scale. At the regional scale, SOM cycling is influenced by factors such as climate and parent material, which affect plant productivity and soil development. More locally, factors such as plant tissue quality and soil mineralogy affect decomposition pathways and stabilization. These factors influence the stability of SOM in part by shaping its molecular characteristics, which play a fundamental role in nearly all processes governing SOM stability but are not the focus of this chapter. We review here the most important controls on the distribution and dynamics of SOM at plot to global scales, and methods used to study them. We also explore the concepts of controls, processes, and mechanisms, and how they operate across scales. The concept of SOM turnover, or mean residence time, is central to this chapter and so it is described in some detail. The Appendix details the use of radiocarbon ({sup 14}C), a powerful isotopic tool for studying SOM dynamics. Much of the material here was originally presented at a NATO Advanced Study Institute on 'Soils and Global Change: Carbon Cycle, Trace Gas Exchange and Hydrology', held June 16-27, 1997, at the Chateau de Bonas, France.

Torn, M.S.; Swanston, C.W.; Castanha, C.; Trumbore, S.E.

2008-07-15T23:59:59.000Z

275

Changes in Russia's Military and Nuclear Doctrine  

SciTech Connect (OSTI)

In 1993, the Russian Federation set out a new military doctrine that would determine the direction of its armed forces until President Putin set out the next doctrine in 2000. The Russian Federation creating the doctrine was new; the USSR had recently collapsed, Gorbachev - the creator of the predecessor to this doctrine in 1987 - was out of office, and the new Russian military had only been formed in May, 1992.1 The analysis of the 1993 doctrine is as follows: a definition of how doctrine is defined; a short history of Russian military doctrine leading up to the 1993 doctrine (officially the Basic Provisions of the Military Doctrine of the Russian Federation); and finally, what the doctrine established. An overview of the 1993 doctrine is: (1) Russia's 1993 doctrine was a return to older, more aggressive doctrine as a result of stability concerns surrounding the recent collapse of the USSR; (2) Russia turned from Gorbachev's 'defensive defense' in the 1987 doctrine to aggressive defense with the option of preempting or striking back against an aggressor; (3) Russia was deeply concerned about how nationalism would affect the former Soviet Republics, particularly in respect to the ethnic Russians still living abroad; and (4) Nuclear doctrine pledged to not be the first to use nuclear weapons but provided for the potential for escalation from a conventional to a nuclear war. The 2000 doctrine (officially the Russian Federation Military Doctrine) was created in a more stable world than the 1993 doctrine was. The Russian Federation had survived independence and the 'threat of direct military aggression against the Russian Federation and its allies' had diminished. It had secured all of the nuclear weapons from its neighbors Ukraine, Belarus, and Kazakhstan, and had elected a new president, Vladimir Putin, to replace Boris Yeltsin. Yet, even as the doctrine took more defensive tones than the 1993 doctrine, it expanded its nuclear options. Below are a new definition of what doctrine meant in 2000 and an outline of the 2000 doctrine. An overview of the 2000 doctrine is: (1) The 2000 doctrine was a return to a more defensive posture; the threat of nuclear retaliation, rather than that of preemptive force, would be its deterrence; (2) In order to strengthen its nuclear deterrence, Russia extended and redefined the cases in which nuclear weapons could be used to include a wider range of conflict types and a larger spectrum of attackers; and (3) Russia's threats changed to reflect its latest fear of engaging in a limited conflict with no prospect of the use of nuclear deterrence. In 2006, the defense minister and deputy prime minister Sergei Ivanov announced that the government was starting on a draft of a future doctrine. Four years later, in 2010, the Military Doctrine of the Russian Federation was put into effect with the intent of determining Russian doctrine until 2020. The 2010 doctrine, like all previous doctrines, was a product of the times in which it was written. Gone were many of the fears that had followed Russia for the past two decades. Below are an examination of the 2010 definition of doctrine as well as a brief analysis of the 2010 doctrine and its deviations from past doctrines. An overview of the 2010 doctrine is: (1) The new doctrine emphasizes the political centralization of command both in military policy and the use of nuclear weapons; (2) Nuclear doctrine remains the same in many aspects including the retention of first-use; (3) At the same time, doctrine was narrowed to using nuclear weapons only when the Russian state's existence is in danger; to continue strong deterrence, Russia also opted to follow the United States by introducing precision conventional weapons; (4) NATO is defined as Russia's primary external threat because of its increased global presence and its attempt to recruit states that are part of the Russian 'bloc'; and (5) The 2000 doctrine's defensive stance was left out of the doctrine; rumored options for use of nuclear weapons in local wars and in preemptive strikes were also left out.

Wolkov, Benjamin M. [Los Alamos National Laboratory; Balatsky, Galya I. [Los Alamos National Laboratory

2012-07-26T23:59:59.000Z