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We encourage you to perform a real-time search of NLEBeta
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1

ITER --"INTERNATIONAL THERMONUCLEAR EXPERIMENTAL RESEARCH PROGRAM".  

E-Print Network [OSTI]

ITER -- "INTERNATIONAL THERMONUCLEAR EXPERIMENTAL RESEARCH PROGRAM". ORGANIZATION TO DIRECT WORLD plasmas and thermonuclear burn processes (cost -$1.5-36)2. (2) An expanded, more ambitious international Thermonuclear Experimental Research Program" by L. J. Perkins #12;NORMAL-CONDUCTING COPPER OPTIONS FOR THE ITER

2

TRANSP simulations of International Thermonuclear Experimental Reactor plasmas  

E-Print Network [OSTI]

TRANSP simulations of International Thermonuclear Experimental Reactor plasmas R. V. Budny, D. C-consistent models for plasmas within the separatrix surface in the International Thermonuclear Experimental Reactor. INTRODUCTION One of the goals for the International Thermonuclear Experimental Reactor ITER is the production

Budny, Robert

3

PUBLISHED VERSION Design, performance, and grounding aspects of the International Thermonuclear Experimental  

E-Print Network [OSTI]

PUBLISHED VERSION Design, performance, and grounding aspects of the International Thermonuclear, performance, and grounding aspects of the International Thermonuclear Experimental Reactor ion cyclotron range Thermonuclear Experimental Reactor ion cyclotron range of frequencies antenna F. Durodie,1,a) P. Dumortier,1 M

4

Economic Impacts on the United States of Siting Decisions for the International Thermonuclear Experimental Reactor  

Science Journals Connector (OSTI)

This paper presents the results of a study that examines and compares the probable short-term economic impacts of the International Thermonuclear Experimental Reactor (ITER) on the United States (U.S.) if (1) ...

J. P. Peerenboom; M. E. Hanson; J. R. Huddleston; T. D. Wolsko

1997-12-01T23:59:59.000Z

5

ITER: The International Thermonuclear Experimental Reactor and the Nuclear Weapons Proliferation  

E-Print Network [OSTI]

militarytechnical reasons and implications of the very probable siting of ITER (the International Thermonuclear

André Gsponer; Jean-pierre Hurni

2004-01-01T23:59:59.000Z

6

The Japan Times Printer Friendly Articles France has won the competition to host the International Thermonuclear Experimental Reactor (ITER), the world's first nuclear-  

E-Print Network [OSTI]

the International Thermonuclear Experimental Reactor (ITER), the world's first nuclear- fusion reactor. Japan fought wins by withdrawing ITER bid Thermonuclear fusion utilizes the same process that powers the sun

7

Management of waste from the International Thermonuclear Experimental Reactor and from future fusion power plants  

Science Journals Connector (OSTI)

An important inherent advantage of fusion would be the total absence of high-level radioactive spent fuel as produced in fission reactors. Fusion will, however, produce activated material containing both activation products and tritium. Part of the material may also contain chemically toxic substances. This paper describes methods that could be used to manage these materials and also methods to reduce or entirely eliminate the waste quantities. The results are based on studies for the International Thermonuclear Experimental Reactor (ITER) and also for future fusion power station designs currently under investigation within the European programme on the Safety and Environmental Assessment of fusion power, Long-term (SEAL).

Karin Brodén; Maria Lindberg; Simon Nisan; Paolo Rocco; Massimo Zucchetti; Neill Taylor; Cleve Forty

1997-01-01T23:59:59.000Z

8

Economic impacts on the United States of siting decisions for the international thermonuclear experimental reactor  

SciTech Connect (OSTI)

This report presents the results of a study that examines and compares the probable short-term economic impacts of the International Thermonuclear Experimental Reactor (ITER) on the United States (U.S.) if (1) ITER were to be sited in the U.S., or (2) ITER were to be sited in one of the other countries that, along with the U.S., is currently participating in the ITER program. Life-cycle costs associated with ITER construction, operation, and decommissioning are analyzed to assess their economic impact. A number of possible U.S. host and U.S. non-host technology and cost-sharing arrangements with the other ITER Parties are examined, although cost-sharing arrangements and the process by which the Parties will select a host country and an ITER site remain open issues. Both national and local/regional economic impacts, as measured by gross domestic product, regional output, employment, net exports, and income, are considered. These impacts represent a portion of the complex, interrelated set of economic considerations that characterize U.S. host and U.S. non-host participation in ITER. A number of other potentially important economic and noneconomic considerations are discussed qualitatively.

Peerenboom, J.P.; Hanson, M.E.; Huddleston, J.R. [and others

1996-08-01T23:59:59.000Z

9

Beryllium fabrication/cost assessment for ITER (International Thermonuclear Experimental Reactor)  

SciTech Connect (OSTI)

A fabrication and cost estimate of three possible beryllium shapes for the International Thermonuclear Experimental Reactor (ITER) blanket is presented. The fabrication method by hot pressing (HP), cold isostatic pressing plus sintering (CIP+S), cold isostatic pressing plus sintering plus hot isostatic pressing (CIP+S+HIP), and sphere production by atomization or rotary electrode will be discussed. Conventional hot pressing blocks of beryllium with subsequent machining to finished shapes can be more expensive than production of a net shape by cold isostatic pressing and sintering. The three beryllium shapes to be considered here and proposed for ITER are: (1) cubic blocks (3 to 17 cm on an edge), (2) tubular cylinders (33 to 50 mm i.d. by 62 mm o.d. by 8 m long), and (3) spheres (1--5 mm dia.). A rough cost estimate of the basic shape is presented which would need to be refined if the surface finish and tolerances required are better than the sintering process produces. The final cost of the beryllium in the blanket will depend largely on the machining and recycling of beryllium required to produce the finished product. The powder preparation will be discussed before shape fabrication. 10 refs., 6 figs.

Beeston, J.M. (Beeston (J.M.), Garrison, UT (USA)); Longhurst, G.R. (EG and G Idaho, Inc., Idaho Falls, ID (USA)); Parsonage, T. (Brush Wellman, Inc., Elmore, OH (USA))

1990-06-01T23:59:59.000Z

10

Toroidal field coil replacement study for the International Thermonuclear Experimental Reactor (ITER)  

SciTech Connect (OSTI)

The objective of this study is to develop an estimate of the time required to replace a failed toroidal field (TF) coil in the International Thermonuclear Experimental Reactor (ITER). This estimate is based on the current ITER design which resulted from the Conceptual Design Activities began in spring of 1988 and ending in December 1990. Although the TF Coils in ITER are designated permanent components and expected to last the life of the plant, the history of failures of large coils in fusion devices has prompted an assessment of the down time that might be required for replacement of a failed TF coil in ITER. The difficulty of replacement of a TF Coil in ITER is compounded by the large physical size of ITER, and the radiation fields which necessitate the use of remote handling equipment for most maintenance activities. Since 10 out of 16 TF coils are adjacent to either a Neutral Beam Injector (NBI) port or a remote handling (RH) port, it is probable that a failed TF Coil will be in one of these inconvenient locations. For this study, TF coil number 3 is assumed to fail and its replacement will be evaluated as a typical case. TF coil number 3 is located between a remote handling port ({number sign}3) and a port allocated to the lower hybrid ({number sign}4).

Not Available

1991-08-01T23:59:59.000Z

11

Toroidal field coil replacement study for the International Thermonuclear Experimental Reactor (ITER)  

SciTech Connect (OSTI)

The objective of this study is to develop an estimate of the time required to replace a failed toroidal field (TF) coil in the International Thermonuclear Experimental Reactor (ITER). This estimate is based on the current ITER design which resulted from the Conceptual Design Activities began in spring of 1988 and ending in December 1990. Although the TF Coils in ITER are designated permanent components and expected to last the life of the plant, the history of failures of large coils in fusion devices has prompted an assessment of the down time that might be required for replacement of a failed TF coil in ITER. The difficulty of replacement of a TF Coil in ITER is compounded by the large physical size of ITER, and the radiation fields which necessitate the use of remote handling equipment for most maintenance activities. Since 10 out of 16 TF coils are adjacent to either a Neutral Beam Injector (NBI) port or a remote handling (RH) port, it is probable that a failed TF Coil will be in one of these inconvenient locations. For this study, TF coil number 3 is assumed to fail and its replacement will be evaluated as a typical case. TF coil number 3 is located between a remote handling port ({number_sign}3) and a port allocated to the lower hybrid ({number_sign}4).

Not Available

1991-08-01T23:59:59.000Z

12

First operation with the JET International Thermonuclear Experimental Reactor-like wall  

SciTech Connect (OSTI)

To consolidate International Thermonuclear Experimental Reactor (ITER) design choices and prepare for its operation, Joint European Torus (JET) has implemented ITER's plasma facing materials, namely, Be for the main wall and W in the divertor. In addition, protection systems, diagnostics, and the vertical stability control were upgraded and the heating capability of the neutral beams was increased to over 30 MW. First results confirm the expected benefits and the limitations of all metal plasma facing components (PFCs) but also yield understanding of operational issues directly relating to ITER. H-retention is lower by at least a factor of 10 in all operational scenarios compared to that with C PFCs. The lower C content (? factor 10) has led to much lower radiation during the plasma burn-through phase eliminating breakdown failures. Similarly, the intrinsic radiation observed during disruptions is very low, leading to high power loads and to a slow current quench. Massive gas injection using a D{sub 2}/Ar mixture restores levels of radiation and vessel forces similar to those of mitigated disruptions with the C wall. Dedicated L-H transition experiments indicate a 30% power threshold reduction, a distinct minimum density, and a pronounced shape dependence. The L-mode density limit was found to be up to 30% higher than for C allowing stable detached divertor operation over a larger density range. Stable H-modes as well as the hybrid scenario could be re-established only when using gas puff levels of a few 10{sup 21} es{sup ?1}. On average, the confinement is lower with the new PFCs, but nevertheless, H factors up to 1 (H-Mode) and 1.3 (at ?{sub N}?3, hybrids) have been achieved with W concentrations well below the maximum acceptable level.

Neu, R. [EFDA-CSU, Boltzmannstr. 2, 85748 Garching (Germany) [EFDA-CSU, Boltzmannstr. 2, 85748 Garching (Germany); Max-Planck-Institut für Plasmaphysik, Euratom Association, Boltzmannstr. 2, 85748 Garching (Germany); Arnoux, G.; Beurskens, M.; Challis, C.; Giroud, C.; Lomas, P.; Maddison, G.; Matthews, G.; Mayoral, M.-L.; Meigs, A.; Rimini, F. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)] [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom); Bobkov, V.; Dux, R.; Hobirk, J.; Lang, P.; Maggi, C.; Pütterich, T.; Sertoli, M.; Sieglin, B. [Max-Planck-Institut für Plasmaphysik, Euratom Association, Boltzmannstr. 2, 85748 Garching (Germany)] [Max-Planck-Institut für Plasmaphysik, Euratom Association, Boltzmannstr. 2, 85748 Garching (Germany); Brezinsek, S. [IEK-4, Association EURATOM/Forschungszentrum Jülich GmbH, Jülich 52425 (Germany)] [IEK-4, Association EURATOM/Forschungszentrum Jülich GmbH, Jülich 52425 (Germany); and others

2013-05-15T23:59:59.000Z

13

Comparison of Nb/sub 3/Sn and NbTi superconductor magnet ITER (International Thermonuclear Experimental Reactor) devices  

SciTech Connect (OSTI)

The TETRA tokamak systems code is used to compare designs for the International Thermonuclear Experimental Reactor (ITER) that use Nb/sub 3/Sn and NbTi superconductor magnets. Similar minimum-cost devices are found with both types of conductors when superfluid helium (He-2) is used in conjunction with the NbTi. The cost of using NbTi with He-1 cooling is much higher than that of using Nb/sub 3/Sn or NbTi with He-2 cooling. Generally, the minimum-cost devices occur for peak fields at the toroidal field coil of about 11.5-13 T, depending on the physics requirements. Sensitivities to the allowable stress level indicate strong cost increases when the stress is reduced from the nominal 600-MPa level and weaker cost benefits when the stress is allowed to reach higher levels. 8 refs., 5 figs., 1 tab.

Galambos, J.D.; Peng, Y.K.M.; Reid, R.L.; Lubell, M.S.; Dresner, L.; Miller, J.R.

1988-01-01T23:59:59.000Z

14

Thermonuclear power—A major international innovative project  

Science Journals Connector (OSTI)

Current status review of a tokamak reactor-based research is intended for the average readers. Using the project of International Thermonuclear Experimental Reactor (ITER) as an example, physical and engineeri...

V. P. Smirnov

2009-11-01T23:59:59.000Z

15

Formation and sustainment of internal transport barriers in the International Thermonuclear Experimental Reactor with the baseline heating mix  

SciTech Connect (OSTI)

Plasmas with internal transport barriers (ITBs) are a potential and attractive route to steady-state operation in ITER. These plasmas exhibit radially localized regions of improved confinement with steep pressure gradients in the plasma core, which drive large bootstrap current and generate hollow current profiles and negative magnetic shear. This work examines the formation and sustainment of ITBs in ITER with electron cyclotron heating and current drive. The time-dependent transport simulations indicate that, with a trade-off of the power delivered to the equatorial and to the upper launcher, the sustainment of steady-state ITBs can be demonstrated in ITER with the baseline heating configuration.

Poli, Francesca M.; Kessel, Charles E. [Princeton Plasma Physics laboratory, Princeton, New Jersey 08543 (United States)] [Princeton Plasma Physics laboratory, Princeton, New Jersey 08543 (United States)

2013-05-15T23:59:59.000Z

16

ROLE OF FUSION ENERGY FOR THE 21 CENTURY ENERGY MARKET AND DEVELOPMENT STRATEGY WITH INTERNATIONAL THERMONUCLEAR EXPERIMENTAL REACTOR  

E-Print Network [OSTI]

Rôle de l’énergie de fusion dans la production énergétique du 21 e siècle et stratégie de développement avec le réacteur thermonucléaire international ITER

Kikuchi Mitsuru

17

03/01/2006 09:51 AMLoading "People's Daily Online --Chinese experimental thermonuclear reactor on discharge test in July" Page 1 of 1http://english.people.com.cn/200603/01/print20060301_247035.html  

E-Print Network [OSTI]

03/01/2006 09:51 AMLoading "People's Daily Online -- Chinese experimental thermonuclear reactor experimental thermonuclear reactor on discharge test in July China's new generation experimental Tokamak fusion and the former Soviet Union launched a 10 billion- euro ambitious plan, the International Thermonuclear

18

INTERNATIONAL THERMONUCLEAR EXPERIMENTAL REACTOR TECHNICAL BASIS  

E-Print Network [OSTI]

Analysis (FDR)1 (the 1998 ITER design), supported by a body of scientific and technological data which both - to demonstrate the scientific and technological feasibility of fusion energy for peaceful purposes - and complied and Thermal Shields II.4 Fuel Cycle II.5 Water Cooling System II.6 Plasma Diagnostic System II.7 Heating

19

Experimental evidence of thermonuclear neutrons in a modified plasma focus  

Science Journals Connector (OSTI)

The PF-1000 plasma focus was modified by adding the cathode disk 3 cm in front of the anode. This modification facilitated the evaluation of neutron energy spectra. Two neutron pulses were distinguishable. As regards the first neutron pulse it lasted 40 ns during the plasma stagnation and it demonstrated high isotropy of neutron emission. A peak neutronenergydetected upstream was 2.46 ± 0.02 ? MeV . The full width of neutron energy spectra of 90 ± 20 ? keV enabled to calculate an ion temperature of 1.2 keV. These parameters and a neutron yield of 10 9 corresponded to theoretical predictions for thermonuclear neutrons.

D. Klir; P. Kubes; M. Paduch; T. Pisarczyk; T. Chodukowski; M. Scholz; Z. Kalinowska; E. Zielinska; B. Bienkowska; J. Hitschfel; S. Jednorog; L. Karpinski; J. Kortanek; J. Kravarik; K. Rezac; I. Ivanova-Stanik; K. Tomaszewski

2011-01-01T23:59:59.000Z

20

Thermonuclear Fusion Energy : Assessment and Next Step Ren Pellat  

E-Print Network [OSTI]

Thermonuclear Fusion Energy : Assessment and Next Step René Pellat High Commissioner at the French 2000, Rome Abstract Fifty years of thermonuclear fusion work with no insurmountable road blocks have is well advanced through the International Thermonuclear Experimental Reactor (ITER) programme, which has

Note: This page contains sample records for the topic "international thermonuclear experimental" 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

Implications of Thermonuclear-Fusion Energy Systems  

E-Print Network [OSTI]

militarytechnical reasons and implications of the very probable siting of ITER (the International Thermonuclear

André Gsponer; Jean-pierre Hurni

2004-01-01T23:59:59.000Z

22

Astrophysical thermonuclear functions  

E-Print Network [OSTI]

As theoretical knowledge and experimental verification of nuclear cross sections increases it becomes possible to refine analytic representations for nuclear reaction rates. In this paper mathematical/statistical techniques for deriving closed-form representations of thermonuclear functions are summarized and numerical results for them are given.The purpose of the paper is also to compare numerical results for approximate and closed-form representations of thermonuclear functions.

W. J. Anderson; H. J. Haubold; A. M. Mathai

1994-02-08T23:59:59.000Z

23

Astrophysical thermonuclear functions  

E-Print Network [OSTI]

Stars are gravitationally stabilized fusion reactors changing their chemical composition while transforming light atomic nuclei into heavy ones. The atomic nuclei are supposed to be in thermal equilibrium with the ambient plasma. The majority of reactions among nuclei leading to a nuclear transformation are inhibited by the necessity for the charged participants to tunnel through their mutual Coulomb barrier. As theoretical knowledge and experimental verification of nuclear cross sections increases it becomes possible to refine analytic representations for nuclear reaction rates. Over the years various approaches have been made to derive closed-form representations of thermonuclear reaction rates (Critchfield 1972, Haubold and John 1978, Haubold, Mathai and Anderson 1987). They show that the reaction rate contains the astrophysical cross section factor and its derivatives which has to be determined experimentally, and an integral part of the thermonuclear reaction rate independent from experimental results which can be treated by closed-form representation techniques in terms of generalized hypergeometric functions. In this paper mathematical/statistical techniques for deriving closed-form representations of thermonuclear functions will be summarized and numerical results for them will be given. The separation of thermonuclear functions from thermonuclear reaction rates is our preferred result. The purpose of the paper is also to compare numerical results for approximate and closed-form representations of thermonuclear functions. This paper completes the work of Haubold, Mathai, and Anderson (1987).

William J. Anderson; Hans J. Haubold; Arak Mathai Mathai

1993-08-23T23:59:59.000Z

24

Finite element modeling and experimental study of brittle fracture in tempered martensitic steels for thermonuclear fusion applications.  

E-Print Network [OSTI]

??In this work we have studied brittle fracture in high-chromium reduced activation tempered martensitic steels foreseen as structural materials for thermonuclear fusion reactors. Developing the… (more)

Mueller, Pablo Federico

2009-01-01T23:59:59.000Z

25

Thermonuclear Supernovae  

E-Print Network [OSTI]

The application of Type Ia supernovae (SNe Ia) as distance indicators in cosmology calls for a sound understanding of these objects. Recent years have seen a brisk development of astrophysical models which explain SNe Ia as thermonuclear explosions of white dwarf stars. While the evolution of the progenitor is still uncertain, the explosion mechanism certainly involves the propagation of a thermonuclear flame through the white dwarf star. Three-dimensional hydrodynamical simulations allowed to study a wide variety of possibilities involving subsonic flame propagation (deflagrations), flames accelerated by turbulence, and supersonic detonations. These possibilities lead to a variety of scenarios. I review the currently discussed approaches and present some recent results from simulations of the turbulent deflagration model and the delayed detonation model.

F. K. Roepke

2008-04-14T23:59:59.000Z

26

New concept for internal heat production in hot Jupiter exo-planets, thermonuclear ignition of dark  

E-Print Network [OSTI]

Discovery of hot Jupiter exo-planets, those with anomalously inflated size and low density relative to Jupiter, has evoked much discussion as to possible sources of internal heat production. But to date, no explanations have come forth that are generally applicable. The explanations advanced typically involve presumed tidal dissipation and/or converted incident stellar radiation. The present, brief communication suggests a novel interfacial nuclear fission-fusion source of internal heat production for hot Jupiters that has been overlooked by theoreticians and which has potentially general applicability.

J. Marvin Herndon

2008-01-01T23:59:59.000Z

27

ASTROPHYSICAL THERMONUCLEAR FUNCTIONS  

E-Print Network [OSTI]

approaches have been made to derive closed-form representations of thermonuclear reaction rates (Critchfield

W. J. Anderson; H. J. Haubold; A. M. Mathai

1993-01-01T23:59:59.000Z

28

Iran cannot have claimed to be building a thermonuclear reactor -To build a thermonuclear reactor by its own efforts is a task absolutely beyond Iran's  

E-Print Network [OSTI]

Iran cannot have claimed to be building a thermonuclear reactor - expert To build a thermonuclear misunderstood." Work to create a thermonuclear reactor has been pursued in all leading countries for several experimental thermonuclear reactor ITER in France. The project involves the European Union, America, Russia

29

Experimental measurements of the O15(alpha,gamma)Ne19 reaction rate and the stability of thermonuclear burning on accreting neutron stars  

E-Print Network [OSTI]

Neutron stars in close binary star systems often accrete matter from their companion stars. Thermonuclear ignition of the accreted material in the atmosphere of the neutron star leads to a thermonuclear explosion which is observed as an X-ray burst occurring periodically between hours and days depending on the accretion rate. The ignition conditions are characterized by a sensitive interplay between the accretion rate of the fuel supply and its depletion rate by nuclear burning in the hot CNO cycle and the rp-process. For accretion rates close to stable burning the burst ignition therefore depends critically on the hot CNO breakout reaction, O15(alpha,gamma)Ne19, that regulates the flow between the hot CNO cycle and the rapid proton capture process. Until recently, the O15(alpha,gamma)Ne19-reaction rate was not known experimentally and the theoretical estimates carried significant uncertainties. In this paper we perform a parameter study of the uncertainty of this reaction rate and determine the astrophysical consequences of the first measurement of this reaction rate. Our results corroborate earlier predictions and show that theoretically burning remains unstable up to accretion rates near the Eddington limit, in contrast to astronomical observations.

Jacob Lund Fisker; Wanpeng Tan; Joachim Goerres; Michael Wiescher; Randall L. Cooper

2007-05-07T23:59:59.000Z

30

International Effort to Design Nuclear Fusion Reactor Launched  

Science Journals Connector (OSTI)

International Effort to Design Nuclear Fusion Reactor Launched ... Their mission is to draw up a design concept for a thermonuclear fusion reactor by December 1990. ... The work at Garching is a direct outgrowth of the recently signed International Thermonuclear Experimental Reactor (ITER) pact involving the European Community, Japan, the Soviet Union, and the U.S. (C&EN, April 25, page 19). ...

DERMOT A. O'SULLLVAN

1988-05-23T23:59:59.000Z

31

Opportunities in the Construction Phase of the International Thermonuclear Experimental Reactor  

Science Journals Connector (OSTI)

Since 1992, fusion researchers from the U.S., Japan, Europe, Russia, and other countries, have been engaged in a very successful collaboration on the engineering design activities (EDA) of the world's first fu...

S. O. Dean; W. R. Ellis; A. Favale; H. Forsen; C. Hamilton…

1999-06-01T23:59:59.000Z

32

IN TODAY'S PAPER International  

E-Print Network [OSTI]

India's participation in the multi-billion-dollar International Thermonuclear Reactor project which aims

33

Elastic-plastic analysis of the transition divertor joint for high performance divertor target plate  

E-Print Network [OSTI]

CER) 8. International Thermonuclear Experimental Reactor (to International Thermonuclear Experimental Reactor (International Thermonuclear Experimental Reactor (ITER) is a

Navaei, Dara

2011-01-01T23:59:59.000Z

34

Thermonuclear reactor may begin to be built 2004 21.02.2004, 00.55  

E-Print Network [OSTI]

Thermonuclear reactor may begin to be built 2004 21.02.2004, 00.55 MOSCOW, February 20 (Itar-Tass) -- Construction of what may become the world's first-ever thermonuclear experimental reactor (ITER) may begin Institute, which developed the thermonuclear reactor, Yevgeny Velikhov said. The Russian panel at the Vienna

35

Thermonuclear Ignition of Dark Galaxies  

E-Print Network [OSTI]

thermonuclear ignition of stars by nuclear fission, and the corollary, non-ignition of stars. The possibility of

J. Marvin Herndon

2006-01-01T23:59:59.000Z

36

Prediction of Thermonuclear Reaction Rates in Astrophysics  

E-Print Network [OSTI]

Recent improvements and remaining problems in the prediction of thermonuclear rates are reviewed. The main emphasis is on statistical model calculations, but the challenge to include direct reactions close to the driplines is also briefly addressed. Further theoretical as well as experimental investigations are motivated.

T. Rauscher

1998-10-15T23:59:59.000Z

37

Study of MHD Corrosion and Transport of Corrosion Products of Ferritic/Martensitic Steels in the Flowing PbLi and its Application to Fusion Blanket  

E-Print Network [OSTI]

Metal systems of thermonuclear reactors, energoatomizdat, inITER International Thermonuclear Experimental Reactor HCLLin ITER (International Thermonuclear Experimental Reactor) (

Saeidi, Sheida

2014-01-01T23:59:59.000Z

38

Macroscopic implications from phase space dynamics of tokamak turbulence : relaxation, transport, and flow generation  

E-Print Network [OSTI]

for the International Thermonuclear Experimental Reactor (for the International Thermonuclear Experimental Reactor (

Kosuga, Yusuke

2012-01-01T23:59:59.000Z

39

Design, performance, and grounding aspects of the International Thermonuclear Experimental Reactor ion cyclotron range of frequencies antenna  

SciTech Connect (OSTI)

ITER's Ion Cyclotron Range of Frequencies (ICRF) system [Lamalle et al., Fusion Eng. Des. 88, 517–520 (2013)] comprises two antenna launchers designed by CYCLE (a consortium of European associations listed in the author affiliations above) on behalf of ITER Organisation (IO), each inserted as a Port Plug (PP) into one of ITER's Vacuum Vessel (VV) ports. Each launcher is an array of 4 toroidal by 6 poloidal RF current straps specified to couple up to 20?MW in total to the plasma in the frequency range of 40 to 55 MHz but limited to a maximum system voltage of 45?kV and limits on RF electric fields depending on their location and direction with respect to, respectively, the torus vacuum and the toroidal magnetic field. A crucial aspect of coupling ICRF power to plasmas is the knowledge of the plasma density profiles in the Scrape-Off Layer (SOL) and the location of the RF current straps with respect to the SOL. The launcher layout and details were optimized and its performance estimated for a worst case SOL provided by the IO. The paper summarizes the estimated performance obtained within the operational parameter space specified by IO. Aspects of the RF grounding of the whole antenna PP to the VV port and the effect of the voids between the PP and the Blanket Shielding Modules (BSM) surrounding the antenna front are discussed. These blanket modules, whose dimensions are of the order of the ICRF wavelengths, together with the clearance gaps between them will constitute a corrugated structure which will interact with the electromagnetic waves launched by ICRF antennas. The conditions in which the grooves constituted by the clearance gaps between the blanket modules can become resonant are studied. Simple analytical models and numerical simulations show that mushroom type structures (with larger gaps at the back than at the front) can bring down the resonance frequencies, which could lead to large voltages in the gaps between the blanket modules and perturb the RF properties of the antenna if they are in the ICRF operating range. The effect on the wave propagation along the wall structure, which is acting as a spatially periodic (toroidally and poloidally) corrugated structure, and hence constitutes a slow wave structure modifying the wall boundary condition, is examined.

Durodié, F., E-mail: frederic.durodie@rma.ac.be; Dumortier, P.; Vrancken, M.; Messiaen, A.; Huygen, S.; Louche, F.; Van Schoor, M.; Vervier, M. [LPP-ERM/KMS, Association EURATOM-Belgian State, Brussels (Belgium); Bamber, R.; Hancock, D.; Lockley, D.; Nightingale, M. P. S.; Shannon, M.; Tigwell, P.; Wilson, D. [EURATOM/CCFE Assoc., Culham Science Centre, Abingdon OX14 3DB (United Kingdom); Maggiora, R.; Milanesio, D. [Associazione EURATOM-ENEA, Politechnico di Torino (Italy); Winkler, K. [IPP-MPI, EURATOM-Assoziation, Garching (Germany)

2014-06-15T23:59:59.000Z

40

Princeton Plasma Physics Laboratory NSTX Experimental Proposal  

E-Print Network [OSTI]

Princeton Plasma Physics Laboratory NSTX Experimental Proposal Title: Dependence of ELM size Projections1 of the energy loss from Type I ELMs for the International Thermonuclear Experimental Reactor perturbations2 or by access to small ELM regimes. Fig. 1 from reference1 , where extrapolation to ITER is done

Princeton Plasma Physics Laboratory

Note: This page contains sample records for the topic "international thermonuclear experimental" 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

Electron Screening Effect on Stellar Thermonuclear Fusion  

E-Print Network [OSTI]

thermonuclear fusions and show that these scenarios do not apply to stellar conditions. c ? 2013 WILEY

K. -h. Spatschek; M. Bonitz; T. Klinger; U. Ebert; C. Franck; A. V. Keudell; D. Naujoks; M. Dewitz; A. Y. Potekhin; G. Chabrier

2012-01-01T23:59:59.000Z

42

Experimental Highlights  

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

weapons as they age or are subjected to the immense pressures and temperatures of a thermonuclear explosion. By providing experimental data to compare to computer models of...

43

Thermonuclear Reflect AB-Reactor  

E-Print Network [OSTI]

The author offers a new kind of thermonuclear reflect reactor. The remarkable feature of this new reactor is a three net AB reflector, which confines the high temperature plasma. The plasma loses part of its energy when it contacts with the net but this loss can be compensated by an additional permanent plasma heating. When the plasma is rarefied (has a small density), the heat flow to the AB reflector is not large and the temperature in the triple reflector net is lower than 2000 - 3000 K. This offered AB-reactor has significantly less power then the currently contemplated power reactors with magnetic or inertial confinement (hundreds-thousands of kW, not millions of kW). But it is enough for many vehicles and ships and particularly valuable for tunnelers, subs and space apparatus, where air to burn chemical fuel is at a premium or simply not available. The author has made a number of innovations in this reactor, researched its theory, developed methods of computation, made a sample computation of typical project. The main point of preference for the offered reactor is its likely cheapness as a power source. Key words: Micro-thermonuclear reactor, Multi-reflex AB-thermonuclear reactor, Self-magnetic AB-thermonuclear reactor, aerospace thermonuclear engine.

Alexander Bolonkin

2008-03-26T23:59:59.000Z

44

President Truman Orders Development of Thermonuclear Weapon ...  

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

Orders Development of Thermonuclear Weapon | National Nuclear Security Administration Facebook Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing...

45

First Thermonuclear Device Successfully Tested | National Nuclear...  

National Nuclear Security Administration (NNSA)

Thermonuclear Device Successfully Tested | National Nuclear Security Administration Facebook Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing...

46

Merging white dwarfs and thermonuclear supernovae  

Science Journals Connector (OSTI)

...across the Universe . Thermonuclear supernovae result when...companion reignites nuclear fusion in a carbon-oxygen white dwarf, causing a thermonuclear runaway, a catastrophic...adiabatically, until carbon fusion becomes faster than...time scales and the thermonuclear runaway starts (along...

2013-01-01T23:59:59.000Z

47

New Views of Thermonuclear Bursts  

E-Print Network [OSTI]

Since the advent of powerful new X-ray observatories, NASA's Rossi X-ray Timing Explorer (RXTE), the Italian - Dutch BeppoSAX mission, XMM-Newton and Chandra, a number of entirely new phenomena associated with thermonuclear burning on neutron stars have been discovered. These include: (i) the discovery of millisecond (300 - 600 Hz) oscillations during bursts, so called ``burst oscillations'', (ii) a new regime of nuclear burning on neutron stars which manifests itself through the generation of hours long flares about once a decade, now referred to as ``superbursts'',(iii) discoveries of bursts from low accretion rate neutron stars, and (iv) new evidence for discrete spectral features from bursting neutron stars. In this article we review our current understanding of thermonuclear bursts on neutron stars, with a focus on these new phenomena.

Tod Strohmayer; Lars Bildsten

2003-05-06T23:59:59.000Z

48

Thermonuclear Ignition of Dark Galaxies  

E-Print Network [OSTI]

Dark matter is thought to be at least an order of magnitude more abundant than luminous matter in the Universe, but there has yet to be an unambiguous identification of a wholly dark, galactic-scale structure. There is, however, increasing evidence that VIRGOHI 21 may be a dark galaxy. If VIRGOHI 21 turns out to be composed of dark stars, having approximately the same mass of stars found in luminous galaxies, it will pose an enigma within the framework of current astrophysical models, but will provide strong support for my concept, published in 1994 in the Proceedings of the Royal Society of London, of the thermonuclear ignition of stars by nuclear fission, and the corollary, non-ignition of stars. The possibility of galactic thermonuclear ignition is discussed from that framework and leads to my suggestion that the distribution of luminous stars in a galaxy may simply be a reflection of the galactic distribution of the heavy elements.

J. Marvin Herndon

2006-04-13T23:59:59.000Z

49

Lower hybrid current drive at densities required for thermonuclear reactors R. Cesario 1), L. Amicucci 2), M. L. Apicella 1), G. Calabr 1), A. Cardinali 1), C. Castaldo 1),  

E-Print Network [OSTI]

EXW/P7-02 Lower hybrid current drive at densities required for thermonuclear reactors R@frascati.enea.it Abstract. For the progress of the thermonuclear fusion energy research based on the tokamak concept in ITER (International Thermonuclear Experiment Reactor) at relatively high plasma densities also

Vlad, Gregorio

50

Search for thermonuclear neutrons in a mega-ampere plasma focus  

Science Journals Connector (OSTI)

Plasma focus experiments were carried out at a modified PF-1000 where the cathode disc was added in front of the anode. Experimental results indicated a fraction of thermonuclear neutrons on the mega-ampere current level. In order to prove the thermonuclear mechanism, the time of neutron production and the neutron energy spectrum were measured by time-of-flight (TOF) diagnostics. Neutron TOF signals showed that the neutron production was a multiphase process and more than one mechanism occurred simultaneously. The occurrence of the thermonuclear mechanism was most evident during the plasma stagnation at low deuterium pressures. At low filling pressures, the narrow width of the neutron energy spectra demonstrated an ion temperature of about 1?keV. The possibility of thermonuclear neutrons was studied also after the stagnation, during the main neutron emission. In this case, the thermonuclear mechanism could be verified by calculating the number of deuterons that participate in the fusion process. For the bulk of thermonuclear plasmas, a significant fraction of plasma should participate in fusion. Finally, the basic consideration of the thermonuclear mechanism in Z-pinches showed the reasonableness of the MagLIF concept.

D Klir; P Kubes; M Paduch; T Pisarczyk; T Chodukowski; M Scholz; Z Kalinowska; B Bienkowska; L Karpinski; J Kortanek; J Kravarik; K Rezac; I Ivanova-Stanik; K Tomaszewski; E Zielinska

2012-01-01T23:59:59.000Z

51

Japan prepares to pitch for international fusion reactor  

Science Journals Connector (OSTI)

... Japan has taken another tentative step towards hosting the International Thermonuclear Experimental Reactor (ITER), ... 's Atomic Energy Commission approved a report supporting construction of the multibillion dollar project in Japan. But the commission also emphasized that hosting the facility must not harm existing Japanese ...

David Cyranoski

2001-04-19T23:59:59.000Z

52

Experimental Highlights - 2014  

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

weapons as they age or are subjected to the immense pressures and temperatures of a thermonuclear explosion. By providing experimental data to compare to computer models of...

53

Workshop on Thermonuclear Reaction Rates for Astrophysics Applications  

E-Print Network [OSTI]

Workshop on Thermonuclear Reaction Rates for Astrophysics Applications 24-25 November 2011, Athensrd and final circular for the Workshop on Thermonuclear Reaction Rates for Astrophysics Applications

54

Statistical Methods for Thermonuclear Reaction Rates and Nucleosynthesis Simulations  

E-Print Network [OSTI]

Rigorous statistical methods for estimating thermonuclear reaction rates and nucleosynthesis are becoming increasingly established in nuclear astrophysics. The main challenge being faced is that experimental reaction rates are highly complex quantities derived from a multitude of different measured nuclear parameters (e.g., astrophysical S-factors, resonance energies and strengths, particle and gamma-ray partial widths). We discuss the application of the Monte Carlo method to two distinct, but related, questions. First, given a set of measured nuclear parameters, how can one best estimate the resulting thermonuclear reaction rates and associated uncertainties? Second, given a set of appropriate reaction rates, how can one best estimate the abundances from nucleosynthesis (i.e., reaction network) calculations? The techniques described here provide probability density functions that can be used to derive statistically meaningful reaction rates and final abundances for any desired coverage probability. Examples ...

Iliadis, Christian; Coc, Alain; Timmes, F X; Champagne, Art E

2014-01-01T23:59:59.000Z

55

Thermonuclear burst physics with RXTE  

E-Print Network [OSTI]

Recently we have made measurements of thermonuclear burst energetics and recurrence times which are unprecedented in their precision, largely thanks to the sensitivity of the Rossi X-ray Timing Explorer. In the "Clocked Burster", GS 1826-24, hydrogen burns during the burst via the rapid-proton (rp) process, which has received particular attention in recent years through theoretical and modelling studies. The burst energies and the measured variation of alpha (the ratio of persistent to burst flux) with accretion rate strongly suggests solar metallicity in the neutron star atmosphere, although this is not consistent with the corresponding variation of the recurrence time. Possible explanations include extra heating between the bursts, or a change in the fraction of the neutron star over which accretion takes place. I also present results from 4U 1746-37, which exhibits regular burst trains which are interrupted by "out of phase" bursts.

D. K. Galloway; D. Chakrabarty; A. Cumming; E. Kuulkers; L. Bildsten; R. Rothschild

2004-04-22T23:59:59.000Z

56

Tidally-induced thermonuclear Supernovae  

E-Print Network [OSTI]

We discuss the results of 3D simulations of tidal disruptions of white dwarfs by moderate-mass black holes as they may exist in the cores of globular clusters or dwarf galaxies. Our simulations follow self-consistently the hydrodynamic and nuclear evolution from the initial parabolic orbit over the disruption to the build-up of an accretion disk around the black hole. For strong enough encounters (pericentre distances smaller than about 1/3 of the tidal radius) the tidal compression is reversed by a shock and finally results in a thermonuclear explosion. These explosions are not restricted to progenitor masses close to the Chandrasekhar limit, we find exploding examples throughout the whole white dwarf mass range. There is, however, a restriction on the masses of the involved black holes: black holes more massive than $2\\times 10^5$ M$_\\odot$ swallow a typical 0.6 M$_\\odot$ dwarf before their tidal forces can overwhelm the star's self-gravity. Therefore, this mechanism is characteristic for black holes of moderate masses. The material that remains bound to the black hole settles into an accretion disk and produces an X-ray flare close to the Eddington limit of $L_{\\rm Edd} \\simeq 10^{41} {\\rm erg/s} M_{\\rm bh}/1000 M$_\\odot$), typically lasting for a few months. The combination of a peculiar thermonuclear supernova together with an X-ray flare thus whistle-blows the existence of such moderate-mass black holes. The next generation of wide field space-based instruments should be able to detect such events.

S. Rosswog; E. Ramirez-Ruiz; W. R. Hix

2008-11-13T23:59:59.000Z

57

The physics of antimatter induced fusion and thermonuclear explosions  

E-Print Network [OSTI]

triggering large scale thermonuclear explosions is investigated. The number of antiproton annihilations

Andre Gsponer; Jean-pierre Hurni

58

Workshop on Thermonuclear Reaction Rates for Astrophysics Applications  

E-Print Network [OSTI]

Workshop on Thermonuclear Reaction Rates for Astrophysics Applications 24-25 November 2011, Athens circular for the Workshop on Thermonuclear Reaction Rates for Astrophysics Applications, to be held of thermonuclear reaction rates. The topics of the workshop, in relation with thermonuclear reaction rates

59

Laser-Induced Implosion and Thermonuclear Burn  

Science Journals Connector (OSTI)

In high density laser induced fusion, the key idea is laser implosion of ... times liquid density in order to initiate efficient thermonuclear burningl. Fusion yields 50–100 times larger than the...5–106...joules...

John H. Nuckolls

1974-01-01T23:59:59.000Z

60

UV Light Curves of Thermonuclear Supernovae  

E-Print Network [OSTI]

Ultraviolet light curves are calculated for several thermonuclear supernova models using a multifrequency radiation hydrodynamic code. It is found that Chandrasekhar-mass models produce very similar light curves both for detonation and deflagration. Sub-Chandrasekhar-mass models essentially differ from ``normal'' Chandrasekhar ones regarding behaviour of their UV fluxes. Differences in absolute brightness and in shape of light curves of thermonuclear supernovae could be detectable up to 300 Mpc with modern UV space telescopes.

S. I. Blinnikov; E. I. Sorokina

2000-03-17T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


61

ITER: an integrated approcah to ignited plasmas  

Science Journals Connector (OSTI)

...International Thermonuclear Experimental...demonstrate essential fusion reactor technologies...poten- tial of thermonuclear fusion as a practical...International Thermonuclear Experimental...world's leading fusion programmes...

1999-01-01T23:59:59.000Z

62

White dwarf mergers,White dwarf mergers, thermonuclear supernovae,thermonuclear supernovae,  

E-Print Network [OSTI]

White dwarf mergers,White dwarf mergers, thermonuclear supernovae,thermonuclear supernovae fusion is ignited. Degenerate, hence runaway. #12;CO white dwarf accretes, either from companion, or from disk after merger. As it approaches maximum mass, C fusion is ignited. Degenerate, hence runaway. SN Ia

Hinton, Jim

63

A E Costley, US/ITER Town meeting, San Diego, 22 April 2004 N 55 IP 57 04-04-30 F 1 International Thermonuclear Experimental Reactor  

E-Print Network [OSTI]

for the integration have been developed and the interfaces with the re to their anticipated operational role (machine protection, control and physics studies). About 45 parameters in total). These are included in the highest level ITER design requirement document (DRG 1). · For each parameter

64

Electron Screening Effect on Stellar Thermonuclear Fusion  

E-Print Network [OSTI]

Key words Dense matter, stellar nucleosynthesis. We study the impact of plasma correlation effects on nonresonant thermonuclear reactions for various stellar objects, namely in the liquid envelopes of neutron stars, and the interiors of white dwarfs, low-mass stars, and substellar objects. We examine in particular the effect of electron screening on the enhancement of thermonuclear reactions in dense plasmas within and beyond the linear mixing rule approximation as well as the corrections due to quantum effects at high density. In addition, we examine some recent unconventional theoretical results on stellar thermonuclear fusions and show that these scenarios do not apply to stellar conditions. c ? 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 1

K. -h. Spatschek; M. Bonitz; T. Klinger; U. Ebert; C. Franck; A. V. Keudell; D. Naujoks; M. Dewitz; A. Y. Potekhin; G. Chabrier

2012-01-01T23:59:59.000Z

65

Antimatter induced fusion and thermonuclear explosions  

E-Print Network [OSTI]

The feasibility of using antihydrogen for igniting inertial confinement fusion pellets or triggering large scale thermonuclear explosions is investigated. The number of antiproton annihilations required to start a thermonuclear burn wave in either DT or Li_2DT is found to be about 10^{21}/k^2, where k is the compression factor of the fuel to be ignited. In the second part, the technologies for producing antiprotons with high energy accelerator systems and the means for manipulating and storing microgram amounts of antihydrogen are examined. While there seems to be no theoretical obstacles to the production of 10^{18} antiprotons per day (the amount required for triggering one thermonuclear bomb), the construction of such a plant involves several techniques which are between 3 and 4 orders of magnitude away from present day technology.

Gsponer, A; Gsponer, Andre; Hurni, Jean-Pierre

1987-01-01T23:59:59.000Z

66

International Collaborations on Engineered Barrier Systems: Experimental and Modeling Investigations  

Broader source: Energy.gov [DOE]

International research collaborations on deep geological disposition of nuclear waste are a key aspect of the nation’s strategy to investigate disposal design concepts in geologic settings...

67

E-Print Network 3.0 - ab-thermonuclear space propulsion Sample...  

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

thermonuclear space propulsion Search Powered by Explorit Topic List Advanced Search Sample search results for: ab-thermonuclear...

68

THE POSSIBILITY OF PRODUCING THERMONUCLEAR REACTIONS IN A GASEOUS DISCHARGE*  

E-Print Network [OSTI]

THE POSSIBILITY OF PRODUCING THERMONUCLEAR REACTIONS IN A GASEOUS DISCHARGE* I.V. Kurchatov of the energy of thermonuclear reactions. Physicists the world over are attracted by the extraordinarily interest- ing and very difficult task of controlling thermonuclear reactiom. Investigations in this field

69

New AB-Thermonuclear Reactor for Aerospace  

E-Print Network [OSTI]

There are two main methods of nulcear fusion: inertial confinement fusion (ICF) and magnetic confinement fusion (MCF). Existing thermonuclear reactors are very complex, expensive, large, and heavy. They cannot achieve the Lawson creterion. The author offers an innovation. ICF has on the inside surface of the shell-shaped combustion chamber a covering of small Prism Reflectors (PR) and plasma reflector. These prism reflectors have a noteworthy advantage, in comparison with conventional mirror and especially with conventional shell: they multi-reflect the heat and laser radiation exactly back into collision with the fuel target capsule (pellet). The plasma reflector reflects the Bremsstrahlung radiation. The offered innovation decreases radiation losses, creates significant radiation pressure and increases the reaction time. The Lawson criterion increases by hundreds of times. The size, cost, and weight of a typical installation will decrease by tens of times. The author is researching the efficiency of these innovations. Keywords: Thermonuclear reactor, Multi-reflex AB-thermonuclear reactor, aerospace thermonuclear engine. This work is presented as paper AIAA-2006-7225 to Space-2006 Conference, 19-21 September, 2006, San Jose, CA, USA.

Alexander Bolonkin

2007-06-14T23:59:59.000Z

70

Micro -Thermonuclear AB-Reactors for Aerospace  

E-Print Network [OSTI]

The author offers several innovations that he first suggested publicly early in 1983 for the AB multi-reflex engine, space propulsion, getting energy from plasma, etc. (see: A. Bolonkin, Non-Rocket Space Launch and Flight, Elsevier, London, 2006, Chapters 12, 3A). It is the micro-thermonuclear AB-Reactors. That is new micro-thermonuclear reactor with very small fuel pellet that uses plasma confinement generated by multi-reflection of laser beam or its own magnetic field. The Lawson criterion increases by hundreds of times. The author also suggests a new method of heating the power-making fuel pellet by outer electric current as well as new direct method of transformation of ion kinetic energy into harvestable electricity. These offered innovations dramatically decrease the size, weight and cost of thermonuclear reactor, installation, propulsion system and electric generator. Non-industrial countries can produce these researches and constructions. Currently, the author is researching the efficiency of these innovations for two types of the micro-thermonuclear reactors: multi-reflection reactor (ICF) and self-magnetic reactor (MCF).

Alexander Bolonkin

2007-01-08T23:59:59.000Z

71

Resonances and the thermonuclear reaction rate  

E-Print Network [OSTI]

We present an approximate analytic expression for thermonuclear reaction rate of charged particles when the cross section contains a single narrow or wide resonance described by a Breit-Wigner shape. The resulting expression is uniformly valid as the effective energy and resonance energy coalesce. We use our expressions to calculate the reaction rate for $^{12}$C(p,$\\gamma$)$^{13}$N.

M. S. Hussein; M. Ueda; A. J. Sargeant; M. P. Pato

2003-07-21T23:59:59.000Z

72

First Thermonuclear Device Successfully Tested | National Nuclear Security  

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

Thermonuclear Device Successfully Tested | National Nuclear Security Thermonuclear Device Successfully Tested | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > First Thermonuclear Device Successfully Tested First Thermonuclear Device Successfully Tested December 31, 1952 Enewetak Atoll First Thermonuclear Device Successfully Tested

73

Licensing sentence-internal readings in english: an experimental study  

Science Journals Connector (OSTI)

Adjectives of comparison (AOCs) like same, different and similar can compare two elements sentence-internally, i.e., without referring to any previously introduced element. This reading is licensed only if a semantically plural NP ... Keywords: Bayesian statistics, acceptability judgments, adjectives of comparison, distributivity, pluralities

Adrian Brasoveanu; Jakub Dotla?il

2011-12-01T23:59:59.000Z

74

Neutron capture of 26Mg at thermonuclear energies  

E-Print Network [OSTI]

The neutron capture cross section of 26Mg was measured relative to the known gold cross section at thermonuclear energies using the fast cyclic activation technique. The experiment was performed at the 3.75 MV Van-de-Graaff accelerator, Forschungszentrum Karlsruhe. The experimental capture cross section is the sum of resonant and direct contributions. For the resonance at E(n,lab) = 220 keV our new results are in disagreement with the data from Weigmann et al. An improved Maxwellian averaged capture cross section is derived from the new experimental data taking into account s- and p-wave capture and resonant contributions. The properties of so-called potential resonances which influence the p-wave neutron capture of 26}Mg are discussed in detail.

P. Mohr; H. Beer; H. Oberhummer; G. Staudt

1998-05-20T23:59:59.000Z

75

Statistical Methods for Thermonuclear Reaction Rates and Nucleosynthesis Simulations  

E-Print Network [OSTI]

Rigorous statistical methods for estimating thermonuclear reaction rates and nucleosynthesis are becoming increasingly established in nuclear astrophysics. The main challenge being faced is that experimental reaction rates are highly complex quantities derived from a multitude of different measured nuclear parameters (e.g., astrophysical S-factors, resonance energies and strengths, particle and gamma-ray partial widths). We discuss the application of the Monte Carlo method to two distinct, but related, questions. First, given a set of measured nuclear parameters, how can one best estimate the resulting thermonuclear reaction rates and associated uncertainties? Second, given a set of appropriate reaction rates, how can one best estimate the abundances from nucleosynthesis (i.e., reaction network) calculations? The techniques described here provide probability density functions that can be used to derive statistically meaningful reaction rates and final abundances for any desired coverage probability. Examples are given for applications to s-process neutron sources, core-collapse supernovae, classical novae, and big bang nucleosynthesis.

Christian Iliadis; Richard Longland; Alain Coc; F. X. Timmes; Art E. Champagne

2014-09-19T23:59:59.000Z

76

Experimental assessment of the internal flow behavior of supercritical carbon dioxide  

E-Print Network [OSTI]

This thesis presents an experimental assessment of the internal flow behavior of supercritical carbon dioxide. The investigation focused mainly on assessing condensation onset during rapid expansion of CO? into the two-phase ...

Yang, David, S.M. Massachusetts Institute of Technology

2014-01-01T23:59:59.000Z

77

Experimental determination of radiated internal wave power without pressure field Frank M. Lee,1  

E-Print Network [OSTI]

in global ocean mixing, it is important to understand the power present in the internal wave fieldExperimental determination of radiated internal wave power without pressure field data Frank M. Lee to determine, using only velocity field data, the time-averaged energy flux J and total radiated power P

Morrison, Philip J.,

78

Merging White Dwarfs and Thermonuclear Supernovae  

E-Print Network [OSTI]

Thermonuclear supernovae result when interaction with a companion reignites nuclear fusion in a carbon-oxygen white dwarf, causing a thermonuclear runaway, a catastrophic gain in pressure, and the disintegration of the whole white dwarf. It is usually thought that fusion is reignited in near-pycnonuclear conditions when the white dwarf approaches the Chandrasekhar mass. I briefly describe two long-standing problems faced by this scenario, and our suggestion that these supernovae instead result from mergers of carbon-oxygen white dwarfs, including those that produce sub-Chandrasekhar mass remnants. I then turn to possible observational tests, in particular those that test the absence or presence of electron captures during the burning.

van Kerkwijk, Marten H

2012-01-01T23:59:59.000Z

79

Solar Models and NACRE thermonuclear reaction rates  

E-Print Network [OSTI]

Using the most recent updated physics, calibrated solar models have been computed with the new thermonuclear reaction rates of NACRE, the recently available European compilation. Comparisons with models computed with the reaction rates of Caughlan & Fowler (\\cite{cf88}) and of Adelberger et al. (\\cite{a98}) are made for global structure, expected neutrinos fluxes, chemical composition and sound speed profiles, helioseismological properties of p-modes and g-modes.

P. Morel; B. Pichon; J. Provost; G. Berthomieu

1999-07-27T23:59:59.000Z

80

Thermonuclear processes of the Universe  

E-Print Network [OSTI]

The book considers some theoretical questions of nuclear astro-physics thermal energies and light atomic nuclei. For the analysis of re-actions is used potential two cluster model of light nuclei with classifica-tion of states by orbital schemes. On its basis photonuclear processes in p2H, p3H, p6Li, p7Li, p9Be and p12C, and also 2H4He, 3H4He, 3He4He and 4He12C channels are considered and astrophysical S - factors corre-sponding to them are calculated. It is shown, that used methods allow to describe well available experimental data in the field of astrophysical energies. This Book is written in Russian, but will perhaps present certain interest.

Sergey B. Dubovichenko

2011-08-12T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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

Stars as thermonuclear reactors: their fuels and ashes  

E-Print Network [OSTI]

Atomic nuclei are transformed into each other in the cosmos by nuclear reactions inside stars: -- the process of nucleosynthesis. The basic concepts of determining nuclear reaction rates inside stars and how they manage to burn their fuel so slowly most of the time are discussed. Thermonuclear reactions involving protons in the hydrostatic burning of hydrogen in stars are discussed first. This is followed by triple alpha reactions in the helium burning stage and the issues of survival of carbon and oxygen in red giant stars connected with nuclear structure of oxygen and neon. Advanced stages of nuclear burning in quiescent reactions involving carbon, neon, oxygen and silicon are discussed. The role of neutron induced reactions in nucleosynthesis beyond iron is discussed briefly, as also the experimental detection of neutrinos from SN 1987A which confirmed broadly the ideas concerning gravitational collapse leading to a supernova.

A. Ray

2004-05-28T23:59:59.000Z

82

Convective heating analysis of an IFE target in a high temperature, low Reynolds number xenon environment  

E-Print Network [OSTI]

conditions required for thermonuclear burn lies on the edgeThe International Thermonuclear Experimental Reactor (ITER)is successful in achieving thermonuclear burn. While NIF is

Holdener, Dain Steffen

2011-01-01T23:59:59.000Z

83

Probing thermonuclear supernova explosions with neutrinos  

E-Print Network [OSTI]

Aims: We present neutrino light curves and energy spectra for two representative type Ia supernova explosion models: a pure deflagration and a delayed detonation. Methods: We calculate the neutrino flux from $\\beta$ processes using nuclear statistical equilibrium abundances convoluted with approximate neutrino spectra of the individual nuclei and the thermal neutrino spectrum (pair+plasma). Results: Although the two considered thermonuclear supernova explosion scenarios are expected to produce almost identical electromagnetic output, their neutrino signatures appear vastly different, which allow an unambiguous identification of the explosion mechanism: a pure deflagration produces a single peak in the neutrino light curve, while the addition of the second maximum characterizes a delayed-detonation. We identified the following main contributors to the neutrino signal: (1) weak electron neutrino emission from electron captures (in particular on the protons Co55 and Ni56) and numerous beta-active nuclei produced by the thermonuclear flame and/or detonation front, (2) electron antineutrinos from positron captures on neutrons, and (3) the thermal emission from pair annihilation. We estimate that a pure deflagration supernova explosion at a distance of 1 kpc would trigger about 14 events in the future 50 kt liquid scintillator detector and some 19 events in a 0.5 Mt water Cherenkov-type detector. Conclusions: While in contrast to core-collapse supernovae neutrinos carry only a very small fraction of the energy produced in the thermonuclear supernova explosion, the SN Ia neutrino signal provides information that allows us to unambiguously distinguish between different possible explosion scenarios. These studies will become feasible with the next generation of proposed neutrino observatories.

A. Odrzywolek; T. Plewa

2011-03-27T23:59:59.000Z

84

Error analysis for resonant thermonuclear reaction rates  

Science Journals Connector (OSTI)

A detailed presentation is given of estimating uncertainties in thermonuclear reaction rates for stellar nucleosynthesis involving narrow resonances, starting from random errors in measured or calculated resonance and nuclear level properties. Special attention is given to statistical matters such as probability distributions, error propagation, and correlations between errors. Interpretation of resulting uncertainties in reaction rates and the distinction between symmetric and asymmetric errors are also discussed. Computing reaction rate uncertainties is described. We give examples from explosive nucleosynthesis by hydrogen burning on light nuclei.

William J. Thompson; C. Iliadis

1999-01-01T23:59:59.000Z

85

Atomic Physics and Thermonuclear Fusion Research  

Science Journals Connector (OSTI)

Presently thermonuclear fusion research is faced with a number of atomic and molecular physics problems depending on the type of high-temperature plasma investigated. The present article discusses some particular atomic physics aspects in connection with magnetically confined plasmas (Tokamaks, Stellarators): (1) rate equations for density, momentum and energy with application to plasmas; (2) initial phase of Tokamak plasmas; (3) influence of impurity radiation on operating conditions of fusion plasmas in general and on Tokamak plasmas in particular; (4) influence of atomic elementary reactions on thermodynamic plasma properties; (5) level structures of highly ionized atoms; (6) spectroscopic diagnostic problems.

H W Drawin

1981-01-01T23:59:59.000Z

86

The Fractional Kinetic Equation and Thermonuclear Functions  

E-Print Network [OSTI]

The paper discusses the solution of a simple kinetic equation of the type used for the computation of the change of the chemical composition in stars like the Sun. Starting from the standard form of the kinetic equation it is generalized to a fractional kinetic equation and its solutions in terms of H-functions are obtained. The role of thermonuclear functions, which are also represented in terms of G- and H-functions, in such a fractional kinetic equation is emphasized. Results contained in this paper are related to recent investigations of possible astrophysical solutions of the solar neutrino problem.

H. J. Haubold; A. M. Mathai

2000-01-16T23:59:59.000Z

87

Oscillations During Thermonuclear X-ray Bursts  

E-Print Network [OSTI]

High amplitude, nearly coherent X-ray brightness oscillations during thermonuclear X-ray bursts were discovered with the Rossi X-ray Timing Explorer (RXTE) in early 1996. Spectral and timing evidence strongly supports the conclusion that these oscillations are caused by rotational modulation of the burst emission and that they reveal the spin frequency of neutron stars in low mass X-ray binaries, a long sought goal of X-ray astronomy. Studies carried out over the past year have led to the discovery of burst oscillations in four new sources, bringing to ten the number with confirmed burst oscillations. I review the status of our knowledge of these oscillations and indicate how they can be used to probe the physics of neutron stars. For a few burst oscillation sources it has been proposed that the strongest and most ubiquitous frequency is actually the first overtone of the spin frequency and hence that two nearly antipodal hot spots are present on the neutron star. This inference has important implications for both the physics of thermonuclear burning as well as the mass - radius relation for neutron stars, so its confirmation is crucial. I discuss recent attempts to confirm this hypothesis for 4U 1636-53, the source for which a signal at the putative fundamental (290 Hz) has been claimed.

Tod E. Strohmayer

2001-01-12T23:59:59.000Z

88

On the Stability of Thermonuclear Burning Fronts in Type Ia Supernovae  

Science Journals Connector (OSTI)

The propagation of cellularly stabilized thermonuclear flames is investigated by means of numerical ... fuel flows. Our simulations indicate that in thermonuclear supernova explosions stable cellular flames devel...

F.K. Röpke; W. Hillebrandt

2005-01-01T23:59:59.000Z

89

E-Print Network 3.0 - astrophysical thermonuclear reactions Sample...  

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

thermonuclear reactions Search Powered by Explorit Topic List Advanced Search Sample search results for: astrophysical thermonuclear reactions Page: << < 1 2 3 4 5 > >> 1 Workshop...

90

E-Print Network 3.0 - alamos thermonuclear weapon Sample Search...  

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

thermonuclear weapon Search Powered by Explorit Topic List Advanced Search Sample search results for: alamos thermonuclear weapon Page: << < 1 2 3 4 5 > >> 1 Dr. Lodwick's research...

91

E-Print Network 3.0 - atypical thermonuclear supernovae Sample...  

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

thermonuclear supernovae Search Powered by Explorit Topic List Advanced Search Sample search results for: atypical thermonuclear supernovae Page: << < 1 2 3 4 5 > >> 1 Supernova...

92

Simplest AB-Thermonuclear Space Propulsion and Electric Generator  

E-Print Network [OSTI]

The author applies, develops and researches mini-sized Micro- AB Thermonuclear Reactors for space propulsion and space power systems. These small engines directly convert the high speed charged particles produced in the thermonuclear reactor into vehicle thrust or vehicle electricity with maximum efficiency. The simplest AB-thermonuclear propulsion offered allows spaceships to reach speeds of 20,000 50,000 km/s (1/6 of light speed) for fuel ratio 0.1 and produces a huge amount of useful electric energy. Offered propulsion system permits flight to any planet of our Solar system in short time and to the nearest non-Sun stars by E-being or intellectual robots during a single human life period. Key words: AB-propulsion, thermonuclear propulsion, space propulsion, thermonuclear power system.

Alexander Bolonkin

2007-01-19T23:59:59.000Z

93

Three-dimensional equilibria in axially symmetric tokamaks  

Science Journals Connector (OSTI)

...General Atomic and the International Thermonuclear Experimental Reactor. When bifurcated...advanced tokamaks like the International Thermonuclear Experimental Reactor (ITER). We have computed...General Atomic and the International Thermonuclear Experimental Reactor. When bifurcated...

Paul R. Garabedian

2006-01-01T23:59:59.000Z

94

Three-dimensional analysis of tokamaks and stellarators  

Science Journals Connector (OSTI)

...are encountered in the International Thermonuclear Experimental Reactor (ITER) project...symmetry for a model of the International Thermonuclear Experimental Reactor (ITER) tokamak, and we discuss...are encountered in the International Thermonuclear Experimental Reactor (ITER) project...

Paul R. Garabedian

2008-01-01T23:59:59.000Z

95

The physics of antimatter induced fusion and thermonuclear explosions  

E-Print Network [OSTI]

The possibility of using antihydrogen for igniting inertial confinement fusion pellets or triggering large scale thermonuclear explosions is investigated. The number of antiproton annihilations required to start a thermonuclear burn wave in either D or Li_2DT is found to be about 10^{21}/k^2, where k is the compression factor of the fuel to be ignited. We conclude that the financial and energy investments needed to produce such amounts of antiprotons would confine applications of antimatter triggered thermonuclear devices to the military domain.

Gsponer, A; Gsponer, Andre; Hurni, Jean-Pierre

1987-01-01T23:59:59.000Z

96

explosion: Role of hydrogen thermonuclear explosion in support of cometary hypothesis  

E-Print Network [OSTI]

deuteron fusion rates and that a thermonuclear explosion may compete with a thermo-chemical explosion

Y. E. Kim

2008-01-01T23:59:59.000Z

97

EXTENSION OF THERMONUCLEAR FUNCTIONS THROUGH THE PATHWAY MODEL INCLUDING MAXWELL-BOLTZMANN AND  

E-Print Network [OSTI]

of respective thermonuclear functions is being conducted with the help of statistical techniques. The

H. J. Haubold

98

Numerical simulations of welds of thick steel pieces of interest for the thermonuclear fusion ITER machine  

E-Print Network [OSTI]

Numerical simulations of welds of thick steel pieces of interest for the thermonuclear fusion ITER machine

Carmignani, B

2005-01-01T23:59:59.000Z

99

Numerical and experimental investigation of melting with internal heat generation within cylindrical enclosures  

SciTech Connect (OSTI)

There have been significant efforts by the heat transfer community to investigate the melting phenomenon of materials. These efforts have included the analytical development of equations to represent melting, numerical development of computer codes to assist in modeling the phenomena, and collection of experimental data. The understanding of the melting phenomenon has application in several areas of interest, for example, the melting of a Phase Change Material (PCM) used as a thermal storage medium as well as the melting of the fuel bundle in a nuclear power plant during an accident scenario. The objective of this research is two-fold. First a numerical investigation, using computational fluid dynamics (CFD), of melting with internal heat generation for a vertical cylindrical geometry is presented. Second, to the best of authors knowledge, there are very limited number of engineering experimental results available for the case of melting with Internal Heat Generation (IHG). An experiment was performed to produce such data using resistive, or Joule, heating as the IHG mechanism. The numerical results are compared against the experimental results and showed favorable correlation. Uncertainties in the numerical and experimental analysis are discussed. Based on the numerical and experimental analysis, recommendations are made for future work.

Amber Shrivastava; Brian Williams; Ali S. Siahpush; Bruce Savage; John Crepeau

2014-06-01T23:59:59.000Z

100

Thermonuclear 42Ti(p,gamma)43V rate in type I X-ray bursts  

E-Print Network [OSTI]

The thermonuclear rate of the $^{42}$Ti($p$,$\\gamma$)$^{43}$V reaction has been reevaluated based on a recent precise proton separation energy measurement of $S_p$($^{43}$V)=83$\\pm$43 keV. The astrophysical impact of our new rates has been investigated through one-zone postprocessing type I x-ray burst calculations. It shows that the new experimental value of $S_p$ significantly affects the yields of species between A$\\approx$40--45. As well, the precision of the recent experimental $S_p$ value constrains these yields to better than a factor of three.

He, J J; Brown, B A; Rauscher, T; Hou, S Q; Zhang, Y H; Zhou, X H; Xu, H S

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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

Thermonuclear Reaction Rate of 23Mg(p,gamma)24$Al  

E-Print Network [OSTI]

Updated stellar rates for the reaction 23Mg(p,gamma)24Al are calculated by using all available experimental information on 24Al excitation energies. Proton and gamma-ray partial widths for astrophysically important resonances are derived from shell model calculations. Correspondences of experimentally observed 24Al levels with shell model states are based on application of the isobaric multiplet mass equation. Our new rates suggest that the 23Mg(p,gamma)24Al reaction influences the nucleosynthesis in the mass A>20 region during thermonuclear runaways on massive white dwarfs.

H. Herndl; M. Fantini; C. Iliades; P. M. Endt; H. Oberhummer

1998-06-05T23:59:59.000Z

102

Thermonuclear 42Ti(p,gamma)43V rate in type I X-ray bursts  

E-Print Network [OSTI]

The thermonuclear rate of the $^{42}$Ti($p$,$\\gamma$)$^{43}$V reaction has been reevaluated based on a recent precise proton separation energy measurement of $S_p$($^{43}$V)=83$\\pm$43 keV. The astrophysical impact of our new rates has been investigated through one-zone postprocessing type I x-ray burst calculations. It shows that the new experimental value of $S_p$ significantly affects the yields of species between A$\\approx$40--45. As well, the precision of the recent experimental $S_p$ value constrains these yields to better than a factor of three.

J. J. He; A. Parikh; B. A. Brown; T. Rauscher; S. Q. Hou; Y. H. Zhang; X. H. Zhou; H. S. Xu

2014-03-10T23:59:59.000Z

103

Atomic Collision Processes in Magnetic Confinement Controlled Thermonuclear Fusion Research  

Science Journals Connector (OSTI)

This NATO Advanced Study Institute is concerned with atomic and molecular processes in controlled thermonuclear fusion research. Most of our attention will be ... and planned tokamaks, since this approach to fusion

M. R. C. McDowell

1980-01-01T23:59:59.000Z

104

AEC Policy and Action Paper on Controlled Thermonuclear Research  

Science Journals Connector (OSTI)

This report was prepared in late 1965 at the request of the U.S. House-Senate Joint Committee on Atomic Energy (JCAE) to review its program on controlled thermonuclear research (CTR), now called just “fusion ener...

Amasa S. Bishop; Stephen O. Dean; Richard F. Post

2011-06-01T23:59:59.000Z

105

Generation of thermonuclear energy by fusing hydrogen and lithium atoms  

Science Journals Connector (OSTI)

A method of designing a thermonuclear reactor based on the modified Cockroft-Walton accelerator, where the lithium-proton fusion was first observed, is considered. It...15 W/cm2...to the cathode are determined. T...

V. E. Tyrsa; L. P. Burtseva

2003-07-01T23:59:59.000Z

106

Are Cataclysmic Variables the Progenitors of Thermonuclear Supernovae?  

Science Journals Connector (OSTI)

In 1973, Whelan and Iben suggested that binary stars, similar in structure to Cataclysmic Variables but not called that by them, were the progenitors of SN Ia’s. Their evidence included the fact that thermonuclear

Sumner Starrfield

2003-01-01T23:59:59.000Z

107

Experimental and numerical correlation of a scaled containment vessel subjected to an internal blast load  

SciTech Connect (OSTI)

Los Alamos National Laboratory is currently in the design phase of a large Containment System that will be used to contain hydrodynamic experiments. The system in question is being designed to elastically withstand a 50 kg internal high explosive (PBX-9501) detonation. A one-tenth scaled model of the containment system was fabricated and used to obtain experimental results of both pressure loading and strain response. The experimental data are compared with numerical predictions of pressure loading and strain response obtained from an Eulerian hydrodynamic code (MESA-2D) and an explicit, non-linear finite element code (LLNL DYNA3D). The two-dimensional pressure predictions from multiple hydrodynamic simulations are used as loading in the structural simulation. The predicted pressure histories and strain response compare well with experimental results at several locations.

Romero, C.; Benner, J.C.; Berkbigler, L.W.

1997-02-01T23:59:59.000Z

108

IAEA-CN-SO/F-I-4 ITER: CONCEPT DEFINITION*  

E-Print Network [OSTI]

way. 1. INTRODUCTION The activity of the International Thermonuclear Experimental Reactor (ITER. * The activity of the International Thermonuclear Experimental Reactor (ITER) is conducted under the auspices

109

France, June 28 Environmental  

E-Print Network [OSTI]

the International Thermonuclear Experimental Reactor was a hazard because scientists did not yet know how | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Google It: International Thermonuclear Experimental Reactor Sortir Du Nucleaire Masatoshi Koshiba

110

Thermonuclear supernova simulations with stochastic ignition  

E-Print Network [OSTI]

We apply an ad hoc model for dynamical ignition in three-dimensional numerical simulations of thermonuclear supernovae assuming pure deflagrations. The model makes use of the statistical description of temperature fluctuations in the pre-supernova core proposed by Wunsch & Woosley (2004). Randomness in time is implemented by means of a Poisson process. We are able to vary the explosion energy and nucleosynthesis depending on the free parameter of the model which controls the rapidity of the ignition process. However, beyond a certain threshold, the strength of the explosion saturates and the outcome appears to be robust with respect to number of ignitions. In the most energetic explosions, we find about 0.75 solar masses of iron group elements. Other than in simulations with simultaneous multi-spot ignition, the amount of unburned carbon and oxygen at radial velocities of a few 1000 km/s tends to be reduced for an ever increasing number of ignition events and, accordingly, more pronounced layering results.

W. Schmidt; J. C. Niemeyer

2005-10-14T23:59:59.000Z

111

If a dispute with the United States,  

E-Print Network [OSTI]

proposed by France for the 10-billion-euro (12-billion-dollar) International Thermonuclear Experimental Research Minister Francois D Aubert International Iter Framework International Thermonuclear Site

112

Thermonuclear reaction rate of $^{18}$Ne($?$,$p$)$^{21}$Na from Monte-Carlo calculations  

E-Print Network [OSTI]

The $^{18}$Ne($\\alpha$,$p$)$^{21}$Na reaction impacts the break-out from the hot CNO-cycles to the $rp$-process in type I X-ray bursts. We present a revised thermonuclear reaction rate, which is based on the latest experimental data. The new rate is derived from Monte-Carlo calculations, taking into account the uncertainties of all nuclear physics input quantities. In addition, we present the reaction rate uncertainty and probability density versus temperature. Our results are also consistent with estimates obtained using different indirect approaches.

P. Mohr; R. Longland; C. Iliadis

2014-12-09T23:59:59.000Z

113

Thermonuclear reaction rate of $^{18}$Ne($?$,$p$)$^{21}$Na from Monte-Carlo calculations  

E-Print Network [OSTI]

The $^{18}$Ne($\\alpha$,$p$)$^{21}$Na reaction impacts the break-out from the hot CNO-cycles to the $rp$-process in type I X-ray bursts. We present a revised thermonuclear reaction rate, which is based on the latest experimental data. The new rate is derived from Monte-Carlo calculations, taking into account the uncertainties of all nuclear physics input quantities. In addition, we present the reaction rate uncertainty and probability density versus temperature. Our results are also consistent with estimates obtained using different indirect approaches.

P. Mohr; R. Longland; C. Iliadis

2014-12-14T23:59:59.000Z

114

Thermonuclear reaction rate of $^{18}$Ne($\\alpha$,$p$)$^{21}$Na from Monte-Carlo calculations  

E-Print Network [OSTI]

The $^{18}$Ne($\\alpha$,$p$)$^{21}$Na reaction impacts the break-out from the hot CNO-cycles to the $rp$-process in type I X-ray bursts. We present a revised thermonuclear reaction rate, which is based on the latest experimental data. The new rate is derived from Monte-Carlo calculations, taking into account the uncertainties of all nuclear physics input quantities. In addition, we present the reaction rate uncertainty and probability density versus temperature. Our results are also consistent with estimates obtained using different indirect approaches.

Mohr, P; Iliadis, C

2014-01-01T23:59:59.000Z

115

Progress and prospect of laser thermonuclear fusion  

Science Journals Connector (OSTI)

Report presented at the International Seminar on Present Status and Future Plan of Inertial Confinement Fusion, Tokyo, Japan, 26 November 1992.

N G Basov

1993-01-01T23:59:59.000Z

116

Measurement of neutron capture on $^{48}$Ca at thermal and thermonuclear energies  

E-Print Network [OSTI]

At the Karlsruhe pulsed 3.75\\,MV Van de Graaff accelerator the thermonuclear $^{48}$Ca(n,$\\gamma$)$^{49}$Ca(8.72\\,min) cross section was measured by the fast cyclic activation technique via the 3084.5\\,keV $\\gamma$-ray line of the $^{49}$Ca-decay. Samples of CaCO$_3$ enriched in $^{48}$Ca by 77.87\\,\\% were irradiated between two gold foils which served as capture standards. The capture cross-section was measured at the neutron energies 25, 151, 176, and 218\\,keV, respectively. Additionally, the thermal capture cross-section was measured at the reactor BR1 in Mol, Belgium, via the prompt and decay $\\gamma$-ray lines using the same target material. The $^{48}$Ca(n,$\\gamma$)$^{49}$Ca cross-section in the thermonuclear and thermal energy range has been calculated using the direct-capture model combined with folding potentials. The potential strengths are adjusted to the scattering length and the binding energies of the final states in $^{49}$Ca. The small coherent elastic cross section of $^{48}$Ca+n is explained through the nuclear Ramsauer effect. Spectroscopic factors of $^{49}$Ca have been extracted from the thermal capture cross-section with better accuracy than from a recent (d,p) experiment. Within the uncertainties both results are in agreement. The non-resonant thermal and thermonuclear experimental data for this reaction can be reproduced using the direct-capture model. A possible interference with a resonant contribution is discussed. The neutron spectroscopic factors of $^{49}$Ca determined from shell-model calculations are compared with the values extracted from the experimental cross sections for $^{48}$Ca(d,p)$^{49}$Ca and $^{48}$Ca(n,$\\gamma$)$^{49}$Ca.

H. Beer; C. Coceva; P. V. Sedyshev; Yu. P. Popov; H. Herndl; R. Hofinger; P. Mohr; H. Oberhummer

1996-08-07T23:59:59.000Z

117

Study of Thermonuclear Alfven Instabilities in Next Step Burning Plasma Experiments  

SciTech Connect (OSTI)

A study is presented for the stability of alpha-particle driven shear Alfven Eigenmodes (AE) for the normal parameters of the three major burning plasma proposals, ITER (International Thermonuclear Experimental Reactor), FIRE (Fusion Ignition Research Experiment), and IGNITOR (Ignited Torus). A study of the JET (Joint European Torus) plasma, where fusion alphas were generated in tritium experiments, is also included to attempt experimental validation of the numerical predictions. An analytic assessment of Toroidal AE (TAE) stability is first presented, where the alpha particle beta due to the fusion reaction rate and electron drag is simply and accurately estimated in 7-20 keV plasma temperature regime. In this assessment the hot particle drive is balanced against ion-Landau damping of the background deuterons and electron collision effects and stability boundaries are determined. Then two numerical studies of AE instability are presented. In one the High-n stability code HINST is used . This code is capable of predicting instabilities of low and moderately high frequency Alfven modes. HINST computes the non-perturbative solution of the Alfven eigenmodes including effects of ion finite Larmor radius, orbit width, trapped electrons etc. The stability calculations are repeated using the global code NOVAK. We show that for these tokamaks the spectrum of the least stable AE modes are TAE that appear at medium-/high-n numbers. In HINST TAEs are locally unstable due to the alphas pressure gradient in all the devices under the consideration except IGNITOR. However, NOVAK calculations show that the global mode structure enhances the damping mechanisms and produces stability in all configurations considered here. A serious question remains whether the perturbation theory used in NOVAK overestimates the stability predictions, so that it is premature to conclude that the nominal operation of all three proposals are stable to AEs. In addition NBI ions produce a strong stabilizing effect for JET. However, in ITER the beam energies needed to penetrate to the core must be high so that a diamagnetic drift frequency comparable to that of the alpha particles is produced by the beam ions which induces a destabilizing effect.

N.N. Gorelenkov; H.L. Berk; R. Budny; C.Z. Cheng; G.-Y. Fu; W.W. Heidbrink; G. Kramer; D. Meade; and R. Nazikian

2002-07-02T23:59:59.000Z

118

Thermonuclear Fusion with the Sheared Flow Stabilized Z-Pinch  

E-Print Network [OSTI]

Two basic approaches to producing thermonuclear fusion with a sheared flow stabilized z-pinch are considered. One consists of heating the entire length of the z-pinch column to the required temperatures. The other basic approach considered here involves the concept of fast ignition. A localized "hot-spot" is produced under the proper conditions to ignite a thermonuclear burn wave in the z-pinch plasma. Here we demonstrate that sheared flow stabilization is more efficient in the fast-ignition method with isentropic compression then in a z-pinch where the entire plasma column is heated.

Winterberg, F

2008-01-01T23:59:59.000Z

119

Thermonuclear Supernovae: Simulations of the Deflagration Stage and Their Implications  

E-Print Network [OSTI]

Large-scale three-dimensional numerical simulations of the deflagration stage of a thermonuclear supernova explosion show the formation and evolution of a highly convoluted turbulent flame in a gravitational field of an expanding carbon-oxygen white dwarf. The flame dynamics is dominated by the gravity-induced Rayleigh-Taylor instability that controls the burning rate. The thermonuclear deflagration releases enough energy to produce a healthy explosion. The turbulent flame, however, leaves large amounts of unburnt and partially burnt material near the star center, whereas observations imply these materials only in outer layers. This disagreement could be resolved if the deflagration triggers a detonation.

V. N. Gamezo; A. M. Khokhlov; E. S. Oran; A. Y. Chtchelkanova; R. O. Rosenberg

2002-12-03T23:59:59.000Z

120

A time-delay approach for the modeling and control of plasma instabilities in thermonuclear fusion  

E-Print Network [OSTI]

1 A time-delay approach for the modeling and control of plasma instabilities in thermonuclear for thermonuclear fusion plasmas. Indeed, advanced plasma confinement scenarios, such as the ones considered

Sipahi, Rifat

Note: This page contains sample records for the topic "international thermonuclear experimental" 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

Thermonuclear explosions of Chandrasekhar-mass C+O white dwarfs  

E-Print Network [OSTI]

thermonuclear burning, by means of a new two-dimensional numerical code. Since in the interior of such a massive

M. Reinecke; W. Hillebrandt

1998-01-01T23:59:59.000Z

122

Treating Unresolvable Flame Physics in Simulations of Thermonuclear Supernovae  

Science Journals Connector (OSTI)

Due to the small width of the subsonic burning front (flame) in thermonuclear supernovae, micrometers to centimeters, and the influence of turbulence, which adds structure to this front on a broad range of scales, it won't be possible in the foreseeable ... Keywords: Computational astrophysics, combustion, turbulence

Dean M. Townsley

2009-03-01T23:59:59.000Z

123

The LOFT perspective on neutron star thermonuclear bursts  

E-Print Network [OSTI]

This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT for the study of thermonuclear X-ray bursts on accreting neutron stars. For a summary, we refer to the paper.

Zand, J J M in 't; Ballantyne, D R; Bhattacharyya, S; Brown, E F; Cavecchi, Y; Chakrabarty, D; Chenevez, J; Cumming, A; Degenaar, N; Falanga, M; Galloway, D K; Heger, A; José, J; Keek, L; Linares, M; Mahmoodifar, S; Malone, C M; Méndez, M; Miller, M C; Paerels, F B S; Poutanen, J; Rózanska, A; Schatz, H; Serino, M; Strohmayer, T E; Suleimanov, V F; Thielemann, F -K; Watts, A L; Weinberg, N N; Woosley, S E; Yu, W; Zhang, S; Zingale, M

2015-01-01T23:59:59.000Z

124

Millisecond oscillations during thermonuclear X-ray bursts  

E-Print Network [OSTI]

I analyze 68 oscillation trains detected in a search of 159 thermonuclear bursts from eight neutron star X-ray binaries observed with the Rossi X-ray Timing Explorer. I use all data that were public as of September 2001. ...

Muno, Michael Patrick, 1975-

2002-01-01T23:59:59.000Z

125

The Effects of Thermonuclear Reaction Rate Variations on Nova Nucleosynthesis: A Sensitivity Study  

E-Print Network [OSTI]

We investigate the effects of thermonuclear reaction rate uncertainties on nova nucleosynthesis. One-zone nucleosynthesis calculations have been performed by adopting temperature-density-time profiles of the hottest hydrogen-burning zone (i.e., the region in which most of the nucleosynthesis takes place). We obtain our profiles from 7 different, recently published, hydrodynamic nova simulations covering peak temperatures in the range from Tpeak=0.145-0.418 GK. For each of these profiles, we individually varied the rates of 175 reactions within their associated errors and analyzed the resulting abundance changes of 142 isotopes in the mass range below A=40. In total, we performed 7350 nuclear reaction network calculations. We use the most recent thermonuclear reaction rate evaluations for the mass ranges A=1-20 and A=20-40. For the theoretical astrophysicist, our results indicate the extent to which nova nucleosynthesis calculations depend on presently uncertain nuclear physics input, while for the experimental nuclear physicist our results represent at least a qualitative guide for future measurements at stable and radioactive ion beam facilities. We find that present reaction rate estimates are reliable for predictions of Li, Be, C and N abundances in nova nucleosynthesis. However, rate uncertainties of several reactions have to be reduced significantly in order to predict more reliable O, F, Ne, Na, Mg, Al, Si, S, Cl and Ar abundances. Results are presented in tabular form for each adopted nova simulation.

Christian Iliadis; Art Champagne; Jordi Jose; Sumner Starrfield; Paul Tupper

2002-06-03T23:59:59.000Z

126

Hydrogen crossover and internal short-circuit currents experimental characterization and modelling in a proton exchange membrane fuel cell  

Science Journals Connector (OSTI)

Abstract Open circuit losses encompass a set of phenomena that reduce PEM fuel cell (PEMFC) efficiency, especially at low current densities. Properly modelling these losses is crucial for obtaining PEMFC models that reproduce accurately the experimental behaviour of \\{PEMFCs\\} operating at low current densities. The open circuit losses can be disaggregated into three distinct contributions: mixed potential, hydrogen crossovers and internal short-circuits. The aim of this work is to obtain a model for the anodic and the cathodic pressure effects on the hydrogen crossovers and the internal short-circuits in a commercial PEMFC. In order to achieve this goal, the hydrogen crossovers and the internal short-circuit were measured experimentally on a commercial PEMFC by linear voltammetry. The measurements were performed at a given temperature and gas inlet humidification level, for different anodic and cathodic pressures.

J.J. Giner-Sanz; E.M. Ortega; V. Pérez-Herranz

2014-01-01T23:59:59.000Z

127

Strong plasma screening in thermonuclear reactions: Electron drop model  

Science Journals Connector (OSTI)

We analyze enhancement of thermonuclear fusion reactions due to strong plasma screening in dense matter using a simple electron drop model. In the model we assume fusion in a potential that is screened by an effective electron cloud around colliding nuclei (extended Salpeter ion-sphere model). We calculate the mean-field screened Coulomb potentials for atomic nuclei with equal and nonequal charges, appropriate astrophysical S factors, and enhancement factors of reaction rates. As a byproduct, we study the analytic behavior of the screening potential at small separations between the reactants. In this model, astrophysical S factors depend not only on nuclear physics but on plasma screening as well. The enhancement factors are in good agreement with calculations by other methods. This allows us to formulate a combined, pure analytic model of strong plasma screening in thermonuclear reactions. The results can be useful for simulating nuclear burning in white dwarfs and neutron stars.

P. A. Kravchuk and D. G. Yakovlev

2014-01-09T23:59:59.000Z

128

Strong plasma screening in thermonuclear reactions: Electron drop model  

E-Print Network [OSTI]

We analyze enhancement of thermonuclear fusion reactions due to strong plasma screening in dense matter using a simple electron drop model. The model assumes fusion in a potential that is screened by an effective electron cloud around colliding nuclei (extended Salpeter ion-sphere model). We calculate the mean field screened Coulomb potentials for atomic nuclei with equal and nonequal charges, appropriate astrophysical S factors, and enhancement factors of reaction rates. As a byproduct, we study analytic behavior of the screening potential at small separations between the reactants. In this model, astrophysical S factors depend not only on nuclear physics but on plasma screening as well. The enhancement factors are in good agreement with calculations by other methods. This allows us to formulate the combined, pure analytic model of strong plasma screening in thermonuclear reactions. The results can be useful for simulating nuclear burning in white dwarfs and neutron stars.

Kravchuk, P A

2014-01-01T23:59:59.000Z

129

Strong plasma screening in thermonuclear reactions: Electron drop model  

E-Print Network [OSTI]

We analyze enhancement of thermonuclear fusion reactions due to strong plasma screening in dense matter using a simple electron drop model. The model assumes fusion in a potential that is screened by an effective electron cloud around colliding nuclei (extended Salpeter ion-sphere model). We calculate the mean field screened Coulomb potentials for atomic nuclei with equal and nonequal charges, appropriate astrophysical S factors, and enhancement factors of reaction rates. As a byproduct, we study analytic behavior of the screening potential at small separations between the reactants. In this model, astrophysical S factors depend not only on nuclear physics but on plasma screening as well. The enhancement factors are in good agreement with calculations by other methods. This allows us to formulate the combined, pure analytic model of strong plasma screening in thermonuclear reactions. The results can be useful for simulating nuclear burning in white dwarfs and neutron stars.

P. A. Kravchuk; D. G. Yakovlev

2014-01-11T23:59:59.000Z

130

Relativistic outflow from two thermonuclear shell flashes on neutron stars  

E-Print Network [OSTI]

We study the exceptionally short (32-41 ms) precursors of two intermediate-duration thermonuclear X-ray bursts observed with RXTE from the neutron stars in 4U 0614+09 and 2S 0918-549. They exhibit photon fluxes that surpass those at the Eddington limit later in the burst by factors of 2.6 to 3.1. We are able to explain both the short duration and the super-Eddington flux by mildly relativistic outflow velocities of 0.1$c$ to 0.3$c$ subsequent to the thermonuclear shell flashes on the neutron stars. These are the highest velocities ever measured from any thermonuclear flash. The precursor rise times are also exceptionally short: about 1 ms. This is inconsistent with predictions for nuclear flames spreading laterally as deflagrations and suggests detonations instead. This is the first time that a detonation is suggested for such a shallow ignition column depth ($y_{\\rm ign}$ = 10$^{10}$ g cm$^{-2}$). The detonation would possibly require a faster nuclear reaction chain, such as bypassing the alpha-capture on $^...

Zand, Jean in 't; Cavecchi, Yuri

2014-01-01T23:59:59.000Z

131

Method of achieving the controlled release of thermonuclear energy  

DOE Patents [OSTI]

A method of achieving the controlled release of thermonuclear energy by illuminating a minute, solid density, hollow shell of a mixture of material such as deuterium and tritium with a high intensity, uniformly converging laser wave to effect an extremely rapid build-up of energy in inwardly traveling shock waves to implode the shell creating thermonuclear conditions causing a reaction of deuterons and tritons and a resultant high energy thermonuclear burn. Utilizing the resulting energy as a thermal source and to breed tritium or plutonium. The invention also contemplates a laser source wherein the flux level is increased with time to reduce the initial shock heating of fuel and provide maximum compression after implosion; and, in addition, computations and an equation are provided to enable the selection of a design having a high degree of stability and a dependable fusion performance by establishing a proper relationship between the laser energy input and the size and character of the selected material for the fusion capsule.

Brueckner, Keith A. (Ann Arbor, MI)

1986-01-01T23:59:59.000Z

132

Closed-form evaluation and approximation considerations of the non-resonant thermonuclear reaction rate  

Science Journals Connector (OSTI)

By use of a highly efficient theory of generalized hypergeometric functions, we show that the non-resonant thermonuclear reaction rate can be evaluated in closed...

H. J. Haubold; R. W. John

1981-04-01T23:59:59.000Z

133

Extension of thermonuclear functions through the pathway model including Maxwell-Boltzmann and Tsallis distributions  

E-Print Network [OSTI]

The Maxwell-Boltzmannian approach to nuclear reaction rate theory is extended to cover Tsallis statistics (Tsallis, 1988) and more general cases of distribution functions. An analytical study of respective thermonuclear functions is being conducted with the help of statistical techniques. The pathway model, recently introduced by Mathai (2005), is utilized for thermonuclear functions and closed-form representations are obtained in terms of H-functions and G-functions. Maxwell-Boltzmannian thermonuclear functions become particular cases of the extended thermonuclear functions. A brief review on the development of the theory of analytic representations of nuclear reaction rates is given.

H. J. Haubold; D. Kumar

2007-08-16T23:59:59.000Z

134

MASSACHUSETTS INSTITUTE OF TECHNOLOGY PLASMA FUSI0.N CENTER  

E-Print Network [OSTI]

. The International Thermonuclear Experimental Reactor (ITER), a superconducting device, is being designed to achieve transport processes and alpha heating effectiveness,[2] at the re- quired thermonuclear conditions

135

Thermonuclear Explosions of Chandrasekhar-Mass White Dwarfs  

E-Print Network [OSTI]

We present a new way of modeling turbulent thermonuclear deflagration fronts in Chandrasekhar-mass white dwarfs, consisting of carbon and oxygen, undergoing a type Ia supernova explosion. Our approach is a front capturing/tracking hybrid scheme, based on a level set method, which treats the front as a mathematical discontinuity and allows for full coupling between the front geometry and the flow field. First results of the method applied to the problem of type Ia supernovae are discussed. It will be shown that even in 2-D and even with a physically motivated sub-grid model numerically ``converged'' results are difficult to obtain.

W. Hillebrandt; M. Reinecke; J. C. Niemeyer

2000-05-16T23:59:59.000Z

136

Faint Thermonuclear Supernovae from AM Canum Venaticorum Binaries  

Science Journals Connector (OSTI)

Helium that accretes onto a carbon/oxygen white dwarf in double white dwarf AM Canum Venaticorum (AM CVn) binaries undergoes unstable thermonuclear flashes when the orbital period is in the 3.5-25 minute range. At the shortest orbital periods (and highest accretion rates, > 10-7 M? yr-1), the flashes are weak and likely lead to the helium equivalent of classical nova outbursts. However, as the orbit widens and drops, the mass required for the unstable ignition increases, leading to progressively more violent flashes up to a final flash with helium shell mass ?0.02-0.1 M?. The high pressures of these last flashes allow the burning to produce the radioactive elements 48Cr, 52Fe, and 56Ni that power a faint (MV = -15 to -18) and rapidly rising (few days) thermonuclear supernova. Current galactic AM CVn space densities imply one such explosion every 5,000-15,000 years in 1011 M? of old stars (?2%-6% of the Type Ia rate in E/SO galaxies). These ".Ia" supernovae (one-tenth as bright for one-tenth the time as a Type Ia supernovae) are excellent targets for deep (e.g., V = 24) searches with nightly cadences, potentially yielding an all-sky rate of 1000 per year.

Lars Bildsten; Ken J. Shen; Nevin N. Weinberg; Gijs Nelemans

2007-01-01T23:59:59.000Z

137

Simulations of Turbulent Thermonuclear Burning in Type Ia Supernovae  

E-Print Network [OSTI]

Type Ia supernovae have recently received considerable attention because it appears that they can be used as "standard candles" to measure cosmic distances out to billions of light years away from us. Observations of type Ia supernovae seem to indicate that we are living in a universe that started to accelerate its expansion when it was about half its present age. These conclusions rest primarily on phenomenological models which, however, lack proper theoretical understanding, mainly because the explosion process, initiated by thermonuclear fusion of carbon and oxygen into heavier elements, is difficult to simulate even on supercomputers. Here, we investigate a new way of modeling turbulent thermonuclear deflagration fronts in white dwarfs undergoing a type Ia supernova explosion. Our approach is based on a level set method which treats the front as a mathematical discontinuity and allows for full coupling between the front geometry and the flow field. New results of the method applied to the problem of type Ia supernovae are obtained. It is shown that in 2-D with high spatial resolution and a physically motivated subgrid scale model for the nuclear flames numerically "converged" results can be obtained, but for most initial conditions the stars do not explode. In contrast, simulations in 3-D, do give the desired explosions and many of their properties, such as the explosion energies, lightcurves and nucleosynthesis products, are in very good agreement with observed type Ia supernovae.

W. Hillebrandt; M. Reinecke; W. Schmidt; F. K. Roepke; C. Travaglio; J. C. Niemeyer

2004-05-11T23:59:59.000Z

138

Cosmic and Galactic Neutrino Backgrounds from Thermonuclear Sources  

E-Print Network [OSTI]

We estimate energy spectra and fluxes at the Earth's surface of the cosmic and Galactic neutrino backgrounds produced by thermonuclear reactions in stars. The extra-galactic component is obtained by combining the most recent estimates of the cosmic star formation history and the stellar initial mass function with accurate theoretical predictions of the neutrino yields all over the thermonuclear lifetime of stars of different masses. Models of the structure and evolution of the Milky Way are used to derive maps of the expected flux generated by Galactic sources as a function of sky direction. The predicted neutrino backgrounds depend only slightly on model parameters. In the relevant 50 keV-10 MeV window, the total flux of cosmic neutrinos ranges between 20 and 65 particles per square cm per s. Neutrinos reaching the Earth today have been typically emitted at redshift z~2. Their energy spectrum peaks at E~0.1-0.3 MeV. The energy and entropy densities of the cosmic background are negligible with respect to the thermal contribution of relic neutrinos originated in the early universe. In every sky direction, the cosmic background is outnumbered by the Galactic one, whose integrated flux amounts to 300-1000 particles per square cm per s. The emission from stars in the Galactic disk contributes more than 95 per cent of the signal.

Cristiano Porciani; Silvia Petroni; Giovanni Fiorentini

2003-11-20T23:59:59.000Z

139

Faint Thermonuclear Supernovae from AM Canum Venaticorum Binaries  

E-Print Network [OSTI]

Helium that accretes onto a Carbon/Oxygen white dwarf in the double white dwarf AM Canum Venaticorum (AM CVn) binaries undergoes unstable thermonuclear flashes when the orbital period is in the 3.5-25 minute range. At the shortest orbital periods (and highest accretion rates, Mdot > 10^-7 Msol/yr), the flashes are weak and likely lead to the Helium equivalent of classical nova outbursts. However, as the orbit widens and Mdot drops, the mass required for the unstable ignition increases, leading to progressively more violent flashes up to a final flash with Helium shell mass ~ 0.02-0.1 Msol. The high pressures of these last flashes allow the burning to produce the radioactive elements 48Cr, 52Fe, and 56Ni that power a faint (M_V in the range of -15 to -18) and rapidly rising (few days) thermonuclear supernova. Current galactic AM CVn space densities imply one such explosion every 5,000-15,000 years in 10^11 Msol of old stars (~ 2-6% of the Type Ia rate in E/SO galaxies). These ".Ia" supernovae (one-tenth as bright for one-tenth the time as a Type Ia supernovae) are excellent targets for deep (e.g. V=24) searches with nightly cadences, potentially yielding an all-sky rate of 1,000 per year.

Lars Bildsten; Ken J. Shen; Nevin N. Weinberg; Gijs Nelemans

2007-05-06T23:59:59.000Z

140

Thermonuclear supernova models, and observations of Type Ia supernovae  

E-Print Network [OSTI]

In this paper, we review the present state of theoretical models of thermonuclear supernovae, and compare their predicitions with the constraints derived from observations of Type Ia supernovae. The diversity of explosion mechanisms usually found in one-dimensional simulations is a direct consequence of the impossibility to resolve the flame structure under the assumption of spherical symmetry. Spherically symmetric models have been successful in explaining many of the observational features of Type Ia supernovae, but they rely on two kinds of empirical models: one that describes the behaviour of the flame on the scales unresolved by the code, and another that takes account of the evolution of the flame shape. In contrast, three-dimensional simulations are able to compute the flame shape in a self-consistent way, but they still need a model for the propagation of the flame in the scales unresolved by the code. Furthermore, in three dimensions the number of degrees of freedom of the initial configuration of the white dwarf at runaway is much larger than in one dimension. Recent simulations have shown that the sensitivity of the explosion output to the initial conditions can be extremely large. New paradigms of thermonuclear supernovae have emerged from this situation, as the Pulsating Reverse Detonation. The resolution of all these issues must rely on the predictions of observational properties of the models, and their comparison with current Type Ia supernova data, including X-ray spectra of Type Ia supernova remnants.

E. Bravo; C. Badenes; D. Garcia-Senz

2004-12-07T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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

On the Evolution of Thermonuclear Flames on Large Scales  

E-Print Network [OSTI]

The thermonuclear explosion of a massive white dwarf in a Type Ia supernova explosion is characterized by vastly disparate spatial and temporal scales. The extreme dynamic range inherent to the problem prevents the use of direct numerical simulation and forces modelers to resort to subgrid models to describe physical processes taking place on unresolved scales. We consider the evolution of a model thermonuclear flame in a constant gravitational field on a periodic domain. The gravitational acceleration is aligned with the overall direction of the flame propagation, making the flame surface subject to the Rayleigh-Taylor instability. The flame evolution is followed through an extended initial transient phase well into the steady-state regime. The properties of the evolution of flame surface are examined. We confirm the form of the governing equation of the evolution suggested by Khokhlov (1995). The mechanism of vorticity production and the interaction between vortices and the flame surface are discussed. The results of our investigation provide the bases for revising and extending previous subgrid-scale model.

Ju Zhang; O. E. Bronson Messer; Alexei M. Khokhlov; Tomasz Plewa

2006-10-05T23:59:59.000Z

142

Astrophysical Thermonuclear Functions for Boltzmann-Gibbs Statistics and Tsallis Statistics  

E-Print Network [OSTI]

We present an analytic proof of the integrals for astrophysical thermonuclear functions which are derived on the basis of Boltzmann-Gibbs statistical mechanics. Among the four different cases of astrophysical thermonuclear functions, those with a depleted high-energy tail and a cut-off at high energies find a natural interpretation in q-statistics.

R. K. Saxena; A. M. Mathai; H. J. Haubold

2004-06-22T23:59:59.000Z

143

Current state, problems, and prospects of thermonuclear facilities based on the magneto-inertial confinement of hot plasma  

Science Journals Connector (OSTI)

Magneto-inertial fusion (MIF) is an original technique of inertial thermonuclear fusion, where spherical and cylindrical gas or plasma...

S. V. Ryzhkov

2014-05-01T23:59:59.000Z

144

Maintaining funding in large-scale international science projects  

Science Journals Connector (OSTI)

International partnerships have become increasingly necessary to achieve scientific breakthroughs. They have been used in the human genome project, space exploration, the development of fusion energy as a source of power, and most recently to identify the SARS virus. In these projects, partners contribute funds, equipment and staff in the pursuit of a common goal. But in recent years the sustainability of funding for some of these projects has become an issue of concern. Two examples include the termination of the Super Conducting Super Collider in 1993 and the withdrawal of the USA from the International Thermonuclear Experimental Reactor (ITER) in 1998. Both suggest the need for better management of the funding process. This paper explores the management of this funding process, supported by a case study, and concludes with several lessons that should prove useful to those who manage these projects.

Barry Shore; Benjamin J. Cross

2004-01-01T23:59:59.000Z

145

Tidally-induced thermonuclear Supernovae Stephan Rosswog1, Enrico Ramirez-Ruiz2, W. Raphael Hix3  

E-Print Network [OSTI]

Tidally-induced thermonuclear Supernovae Stephan Rosswog1, Enrico Ramirez-Ruiz2, W. Raphael Hix3 1 in a thermonuclear explosion. These explosions are not restricted to progenitor masses close to the Chandrasekhar thermonuclear supernova together with an X-ray flare thus whistle-blows the existence of such moderate

Rosswog, Stephan

146

Thermonuclear rates of the 28Si(p, y) reaction M. Kicinska-Habior and T. Matulewicz  

E-Print Network [OSTI]

1881 Thermonuclear rates of the 28Si(p, y) reaction M. Kicinska-Habior and T. Matulewicz Institute Thermonuclear reaction rates NA av > are the quan- tities of essential importance for models of stellar in a much more extended energy range. The thermonuclear rates of the 28Si(p, y) reaction, although it does

Paris-Sud XI, Université de

147

On the Evolution of Thermonuclear Flames on Large Scales  

Science Journals Connector (OSTI)

The thermonuclear explosion of a massive white dwarf in a Type Ia supernova explosion is characterized by vastly disparate spatial and temporal scales. The extreme dynamic range inherent to the problem prevents the use of direct numerical simulation and forces modelers to resort to subgrid models to describe physical processes taking place on unresolved scales. We consider the evolution of a model thermonuclear flame in a constant gravitational field on a periodic domain. The gravitational acceleration is aligned with the overall direction of the flame propagation, making the flame surface subject to the Rayleigh-Taylor instability. The flame evolution is followed through an extended initial transient phase well into the steady state regime. The properties of the evolution of flame surface are examined. We confirm the form of the governing equation of the evolution suggested by Khokhlov in 1995. The mechanism of vorticity production and the interaction between vortices and the flame surface are discussed. Previously observed periodic behavior of the flame evolution is reproduced and is found to be caused by the turnover of the largest eddies. The characteristic timescales are found to be similar to the turnover time of these eddies. Relations between flame surface creation and destruction processes and basic characteristics of the flow are discussed. We find that the flame surface creation strength is associated with the Rayleigh-Taylor timescale. Also, in fully developed turbulence, the flame surface destruction strength scales as 1/L3, where L is the turbulent driving scale. The results of our investigation provide support for Khokhlov's self-regulating model of turbulent thermonuclear flames. Based on these results, one can revise and extend the original model. The revision uses a local description of the flame surface enhancement and the evolution of the flame surface since the onset of turbulence, rendering it free from the assumption of an instantaneous steady state of turbulence. This new model can be applied to the initial transient phase of the flame evolution, where the self-regulation mechanism yet to be fully established. Details of this new model will be presented in a forthcoming paper.

Ju Zhang; O. E. Bronson Messer; Alexei M. Khokhlov; Tomasz Plewa

2007-01-01T23:59:59.000Z

148

JET deuterium: tritium results and their implications  

Science Journals Connector (OSTI)

...ignition and thermonuclear burn will occur in ITER and a fusion reactor. magnetic...state) and fusion duration...International Thermonuclear Experimental...ignition and thermonuclear burn will occur in ITER and a fusion reactor. Keywords...

1999-01-01T23:59:59.000Z

149

History of the approach to ignition  

Science Journals Connector (OSTI)

...International Thermonuclear Experimental Reactor...recommended. plasma|fusion|tokamak|ignition...density plasma to thermonuclear temperatures...in the quest for fusion power. Such an...temperatures of thermonuclear interest, this...for an acceptable fusion reactor. By a...

1999-01-01T23:59:59.000Z

150

Screening in Thermonuclear Reaction Rates in the Sun  

E-Print Network [OSTI]

We evaluate the effect of electrostatic screening by ions and electrons on low-Z thermonuclear reactions in the sun. We use a mean field formalism and calculate the electron density of the screening cloud using the appropriate density matrix equation of quantum statistical mechanics. Because of well understood physical effects that are included for the first time in our treatment, the calculated enhancement of reaction rates does not agree with the frequently used interpolation formulae. Our result does agree, within small uncertainties, with Salpeter's weak screening formula. If weak screening is used instead of the commonly employed screening prescription of Graboske et al., the predicted $^8$B neutrino flux is increased by 7% and the predicted chlorine rate is increased by 0.4 SNU.

Andrei V. Gruzinov; John N. Bahcall

1998-01-20T23:59:59.000Z

151

The Periods Discovered by RXTE in Thermonuclear Flash Bursts  

E-Print Network [OSTI]

Oscillations in the X-ray flux of thermonuclear X-ray bursts have been observed with RXTE from at least 6 low-mass binaries, at frequencies from 330 Hz to 589 Hz. There appear to be preferred relations between the frequencies present during the bursts and those seen in the persistent flux. The amplitude of the oscillations can exceed 50 % near burst onset. Except for a systematic increase in oscillation frequency as the burst progresses, the frequency is stable. Time resolved spectra track increases in the X-ray emitting area due to propagation of the burning front over the neutron star surface, as well as radiation driven expansion of the photosphere. The neutron star mass, radius, and distance can be inferred when spectra are compared to theoretical expectations.

T. E. Strohmayer; J. H. Swank; W. Zhang

1998-01-23T23:59:59.000Z

152

On the stability of thermonuclear shell sources in stars  

E-Print Network [OSTI]

We present a quantitative criterion for the thermal stability of thermonuclear shell sources. We find the thermal stability of shell sources to depend on exactly three factors: they are more stable when they are geometrically thicker, less degenerate and hotter. This confirms and unifies previously obtained results in terms of the geometry, temperature and density of the shell source, by a simplified but quantitative approach to the physics of shell nuclear burning. We present instability diagrams in the temperature-density plane for hydrogen and helium shell burning, which allow a simple evaluation of the stability conditions of such shell sources in stellar models. The performance of our stability criterion is demonstrated in various numerical models: in a 3 Msun AGB star, in helium accreting CO white dwarfs, in a helium white dwarf which is covered by a thin hydrogen envelope, and in a 1.0 Msun giant.

S. -C. Yoon; N. Langer; M. van der Sluys

2004-06-07T23:59:59.000Z

153

Measurement of neutron capture on 50Ti at thermonuclear energies  

E-Print Network [OSTI]

At the Karlsruhe and Tuebingen 3.75 MV Van de Graaff accelerators the thermonuclear 50Ti(n,gamma)51Ti(5.8 min) cross section was measured by the fast cyclic activation technique via the 320.852 and 928.65 keV gamma-ray lines of the 51Ti-decay. Metallic Ti samples of natural isotopic composition and samples of TiO2 enriched in 50Ti by 67.53 % were irradiated between two gold foils which served as capture standards. The capture cross-section was measured at the neutron energies 25, 30, 52, and 145 keV, respectively. The direct capture cross section was determined to be 0.387 +/- 0.011 mbarn at 30 keV. We found evidence for a bound state s-wave resonance with an estimated radiative width of 0.34 eV which destructively interfers with direct capture. The strength of a suggested s-wave resonance at 146.8 keV was determined. The present data served to calculate, in addition to the directly measured Maxwellian averaged capture cross sections at 25 and 52 keV, an improved stellar 50Ti(n,gamma)51Ti rate in the thermonuclear energy region from 1 to 250 keV. The new stellar rate leads at low temperatures to much higher values than the previously recommended rate, e.g., at kT=8 keV the increase amounts to about 50 %. The new reaction rate therefore reduces the abundance of 50Ti due to s-processing in AGB stars.

P. V. Sedyshev; P. Mohr; H. Beer; H. Oberhummer; Yu. P. Popov; W. Rochow

1999-07-28T23:59:59.000Z

154

Detonating Failed Deflagration Model of Thermonuclear Supernovae I. Explosion Dynamics  

E-Print Network [OSTI]

We present a detonating failed deflagration model of Type Ia supernovae. In this model, the thermonuclear explosion of a massive white dwarf follows an off-center deflagration. We conduct a survey of asymmetric ignition configurations initiated at various distances from the stellar center. In all cases studied, we find that only a small amount of stellar fuel is consumed during deflagration phase, no explosion is obtained, and the released energy is mostly wasted on expanding the progenitor. Products of the failed deflagration quickly reach the stellar surface, polluting and strongly disturbing it. These disturbances eventually evolve into small and isolated shock-dominated regions which are rich in fuel. We consider these regions as seeds capable of forming self-sustained detonations that, ultimately, result in the thermonuclear supernova explosion. Preliminary nucleosynthesis results indicate the model supernova ejecta are typically composed of about 0.1-0.25 Msun of silicon group elements, 0.9-1.2 Msun of iron group elements, and are essentially carbon-free. The ejecta have a composite morphology, are chemically stratified, and display a modest amount of intrinsic asymmetry. The innermost layers are slightly egg-shaped with the axis ratio ~1.2-1.3 and dominated by the products of silicon burning. This central region is surrounded by a shell of silicon-group elements. The outermost layers of ejecta are highly inhomogeneous and contain products of incomplete oxygen burning with only small admixture of unburned stellar material. The explosion energies are ~1.3-1.5 10^51 erg.

Tomasz Plewa

2006-11-24T23:59:59.000Z

155

Princeton Plasma Physics Laboratory NSTX Experimental Proposal  

E-Print Network [OSTI]

Princeton Plasma Physics Laboratory NSTX Experimental Proposal Title: Dependence of ELM size Thermonuclear Experimental Reactor (ITER) have yielded a pedestal energy loss fraction between 5% and 20 with resonant magnetic perturbations2 or by access to small ELM regimes. Fig. 1 from reference1 , where

Princeton Plasma Physics Laboratory

156

Experimental determination of radiated internal wave power without pressure field data  

SciTech Connect (OSTI)

We present a method to determine, using only velocity field data, the time-averaged energy flux (J) and total radiated power P for two-dimensional internal gravity waves. Both (J) and P are determined from expressions involving only a scalar function, the stream function ?. We test the method using data from a direct numerical simulation for tidal flow of a stratified fluid past a knife edge. The results for the radiated internal wave power given by the stream function method agree to within 0.5% with results obtained using pressure and velocity data from the numerical simulation. The results for the radiated power computed from the stream function agree well with power computed from the velocity and pressure if the starting point for the stream function computation is on a solid boundary, but if a boundary point is not available, care must be taken to choose an appropriate starting point. We also test the stream function method by applying it to laboratory data for tidal flow past a knife edge, and the results are found to agree with the direct numerical simulation. The supplementary material includes a Matlab code with a graphical user interface that can be used to compute the energy flux and power from two-dimensional velocity field data.

Lee, Frank M.; Morrison, P. J. [Physics Department and Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712–1192 (United States)] [Physics Department and Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712–1192 (United States); Paoletti, M. S.; Swinney, Harry L. [Physics Department, The University of Texas at Austin, Austin, Texas 78712–1192 (United States)] [Physics Department, The University of Texas at Austin, Austin, Texas 78712–1192 (United States)

2014-04-15T23:59:59.000Z

157

Thermalization and Exhaust of Helium in a Future Thermonuclear Reactor: Partly an Atomic Physics Problem  

Science Journals Connector (OSTI)

The magnetically confined plasma of a continuously or quasi-continuously working thermonuclear fusion reactor must satisfy several severe conditions in ... the a-particles born in the D-T fusion process, the othe...

H. W. Drawin

1980-01-01T23:59:59.000Z

158

Plasma-materials interactions and impurity control in magnetically confined thermonuclear fusion machines  

Science Journals Connector (OSTI)

Progress achieved in plasma heating and magnetic confinement during the past decade has brought to the fore a number of problems which have to be solved if controlled thermonuclear fusion is to become an economic...

Dieter M. Gruen; Stanislav Vep?ek; Randy B. Wright

1980-01-01T23:59:59.000Z

159

A low-radioactive D-3He thermonuclear fuel cycle with 3He self-supply  

Science Journals Connector (OSTI)

The possibility of implementing a highly efficient low-radioactive thermonuclear fuel cycle using deuterium as the raw...3He reaction, with 3He obtained in the course of the reactor operation. It is shown that, u...

V. I. Khvesyuk; A. Yu. Chirkov

2001-08-01T23:59:59.000Z

160

A bright thermonuclear X-ray burst simultaneously observed with Chandra and RXTE  

E-Print Network [OSTI]

The prototypical accretion-powered millisecond pulsar SAX J1808.4?3658 was observed simultaneously with Chandra-LETGS and RXTE-PCA near the peak of a transient outburst in November 2011. A single thermonuclear (type-I) ...

in ’t Zand, J. J. M.

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


161

Application of variational techniques for parametric studies of steady-state controlled thermonuclear reactor blankets  

E-Print Network [OSTI]

APPLICATION OF VARIATIONAL TECHNIQUES FOR PARAMETRIC STUDIES OF STEADY-STATE CONTROLLED THERMONUCLEAR REACTOR BLANKETS A Thesis JAMES DAVID PEARCE Submitted to the Graduate College of Texas A6M University in partial fulfillment... of the requirement for the degree of MASTER OP SCIENCE May 1975 Ma)or Subject: Nuclear Engineering APPLICATION OF VARIATIONAL TECHNIQUES FOR PARAMETRIC STUDIES OF STEADY-STATE CONTROLLED THERMONUCLEAR REACTOR BLANKETS A Thesis by JAMES DAVID PEARCE Approved...

Pearce, James David

1975-01-01T23:59:59.000Z

162

Reaction Rate and Composition Dependence of the Stability of Thermonuclear Burning on Accreting Neutron Stars  

E-Print Network [OSTI]

The stability of thermonuclear burning of hydrogen and helium accreted onto neutron stars is strongly dependent on the mass accretion rate. The burning behavior is observed to change from Type I X-ray bursts to stable burning, with oscillatory burning occurring at the transition. Simulations predict the transition at a ten times higher mass accretion rate than observed. Using numerical models we investigate how the transition depends on the hydrogen, helium, and CNO mass fractions of the accreted material, as well as on the nuclear reaction rates of triple alpha and the hot-CNO breakout reactions 15O(a,g)19Ne and 18Ne(a,p)21Na. For a lower hydrogen content the transition is at higher accretion rates. Furthermore, most experimentally allowed reaction rate variations change the transition accretion rate by at most 10%. A factor ten decrease of the 15O(a,g)19Ne rate, however, produces an increase of the transition accretion rate of 35%. None of our models reproduce the transition at the observed rate, and depend...

Keek, L; Heger, A

2014-01-01T23:59:59.000Z

163

Thermonuclear X-ray Bursts: Theory vs. Observations  

E-Print Network [OSTI]

I review our theoretical understanding of thermonuclear flashes on accreting neutron stars, concentrating on comparisons to observations. Sequences of regular Type I X-ray bursts from GS 1826-24 and 4U 1820-30 are very well described by the theory. I discuss recent work which attempts to use the observed burst properties in these sources to constrain the composition of the accreted material. For GS 1826-24, variations in the burst energetics with accretion rate indicate that the accreted material has solar metallicity; for 4U 1820-30, future observations should constrain the hydrogen fraction, testing evolutionary models. I briefly discuss the global bursting behavior of burst sources, which continues to be a major puzzle. Finally, I turn to superbursts, which naturally fit into the picture as unstable carbon ignition in a thick layer of heavy elements. I present new time-dependent models of the cooling tails of superbursts, and discuss the various interactions between superbursts and normal Type I bursts, and what can be learned from them.

Andrew Cumming

2003-11-18T23:59:59.000Z

164

The NACRE Thermonuclear Reaction Compilation and Big Bang Nucleosynthesis  

E-Print Network [OSTI]

The theoretical predictions of big bang nucleosynthesis (BBN) are dominated by uncertainties in the input nuclear reaction cross sections. In this paper, we examine the impact on BBN of the recent compilation of nuclear data and thermonuclear reactions rates by the NACRE collaboration. We confirm that the adopted rates do not make large overall changes in central values of predictions, but do affect the magnitude of the uncertainties in these predictions. Therefore, we then examine in detail the uncertainties in the individual reaction rates considered by NACRE. When the error estimates by NACRE are treated as 1\\sigma limits, the resulting BBN error budget is similar to those of previous tabulations. We propose two new procedures for deriving reaction rate uncertainties from the nuclear data: one which sets lower limits to the error, and one which we believe is a reasonable description of the present error budget. We propagate these uncertainty estimates through the BBN code, and find that when the nuclear data errors are described most accurately, the resulting light element uncertainties are notably smaller than in some previous tabulations, but larger than others. Using these results, we derive limits on the cosmic baryon-to-photon ratio $\\eta$, and compare this to independent limits on $\\eta$ from recent balloon-borne measurements of the cosmic microwave background radiation (CMB). We discuss means to improve the BBN results via key nuclear reaction measurements and light element observations.

Richard H. Cyburt; Brian D. Fields; Keith A. Olive

2001-05-17T23:59:59.000Z

165

The cooling rate of neutron stars after thermonuclear shell flashes  

E-Print Network [OSTI]

Thermonuclear shell flashes on neutron stars are detected as bright X-ray bursts. Traditionally, their decay is modeled with an exponential function. However, this is not what theory predicts. The expected functional form for luminosities below the Eddington limit, at times when there is no significant nuclear burning, is a power law. We tested the exponential and power-law functional forms against the best data available: bursts measured with the high-throughput Proportional Counter Array (PCA) on board the Rossi X-ray Timing Explorer. We selected a sample of 35 'clean' and ordinary (i.e., shorter than a few minutes) bursts from 14 different neutron stars that 1) show a large dynamic range in luminosity, 2) are the least affected by disturbances by the accretion disk and 3) lack prolonged nuclear burning through the rp-process. We find indeed that for every burst a power law is a better description than an exponential function. We also find that the decay index is steep, 1.8 on average, and different for eve...

Zand, J J M in 't; Triemstra, T L; Mateijsen, R A D A; Bagnoli, T

2013-01-01T23:59:59.000Z

166

Study of internal magnetic field via polarimetry in fusion plasmas  

E-Print Network [OSTI]

Motivation Controlled thermonuclear fusion is a promising2007]. Controlled thermonuclear fusion is based on the

Zhang, Jie

2013-01-01T23:59:59.000Z

167

The Sensitivity of Nucleosynthesis in Type I X-ray Bursts to Thermonuclear Reaction-Rate Variations  

E-Print Network [OSTI]

We examine the sensitivity of nucleosynthesis in Type I X-ray bursts to variations in nuclear rates. As a large number of nuclear processes are involved in these phenomena -with the vast majority of reaction rates only determined theoretically due to the lack of any experimental information- our results can provide a means for determining which rates play significant roles in the thermonuclear runaway. These results may then motivate new experiments. For our studies, we have performed a comprehensive series of one-zone post-processing calculations in conjunction with various representative X-ray burst thermodynamic histories. We present those reactions whose rate variations have the largest effects on yields in our studies.

Anuj Parikh; Jordi Jose; Fermin Moreno; Christian Iliadis

2008-06-18T23:59:59.000Z

168

Astrophysical S-factors of proton radiative capture for thermonuclear reactions  

E-Print Network [OSTI]

In this review we have considered the possibility to describe the astrophysical S-factors of radiative capture reactions with light atomic nuclei on the basis of the potential two-cluster model by taking into account the splitting the orbital states according to Young's schemes. Within this model, interaction of the nucleon clusters is described by local two-particle potential determined by fit to the scattering data and properties of bound states of these clusters. Many-body character of the problem is taken into account under some approximation, in terms of the allowed or forbidden by the Pauli principle states in intercluster potentials. An important feature of the approach is accounting for a dependence of interaction potential between clusters on the orbital Young scheme, which determines the permutation symmetry of the nucleon system. The astrophysical S-factors of the radiative capture processes in the p2H, p7Li and p12C systems are analyzed on the basis of this approach. It is shown that the approach allows one to describe quite reasonably experimental data available at low energies, when the phase shifts of cluster-cluster scattering are extracted from the data with minimal errors. In this connection the problem of experimental error decrease is exclusively urgent for the differential cross-sections of elastic scattering of light atomic nuclei at astrophysical energies and to perform a more accurate phase shift analysis. The increase in the accuracy will allow, in future, making more definite conclusions regarding the mechanisms and conditions of thermonuclear reactions, as well as understanding better their nature in general.

S. B. Dubovichenko; A. V. Dzhazairov-Kakhramanov

2011-12-09T23:59:59.000Z

169

Super-Eddington Fluxes During Thermonuclear X-ray Bursts  

Science Journals Connector (OSTI)

It has been known for nearly three decades that the energy spectra of thermonuclear X-ray bursts are often well fit by Planck functions with temperatures so high that they imply a super-Eddington radiative flux at the emitting surface, even during portions of bursts when there is no evidence of photospheric radius expansion. This apparent inconsistency is usually set aside by assuming that the flux is actually sub-Eddington and that the fitted temperature is so high because the spectrum has been distorted by the energy-dependent opacity of the atmosphere. Here we show that the spectra predicted by currently available conventional atmosphere models appear incompatible with the highest precision measurements of burst spectra made using the Rossi X-ray Timing Explorer, such as during the 4U 1820–30 superburst and a long burst from GX 17+2. In contrast, these measurements are well fit by Bose-Einstein spectra with high temperatures and modest chemical potentials. Such spectra are very similar to Planck spectra. They imply surface radiative fluxes more than a factor of 3 larger than the Eddington flux. We find that segments of many other bursts from many sources are well fit by similar Bose-Einstein spectra, suggesting that the radiative flux at the emitting surface also exceeds the Eddington flux during these segments. We suggest that burst spectra can closely approximate Bose-Einstein spectra and have fluxes that exceed the Eddington flux because they are formed by Comptonization in an extended, low-density radiating gas supported by the outward radiation force and confined by a tangled magnetic field.

Stratos Boutloukos; M. Coleman Miller; Frederick K. Lamb

2010-01-01T23:59:59.000Z

170

Choice of coils for a fusion reactor  

Science Journals Connector (OSTI)

...configurations. The most ambitious is the International Thermonuclear Experimental Reactor, a large tokamak planned for construction...configuration has features in common with the International Thermonuclear Experimental Reactor experiment. Mathematical Model We...

Romeo Alexander; Paul R. Garabedian

2007-01-01T23:59:59.000Z

171

E-Print Network 3.0 - advanced passive reactor Sample Search...  

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

... Source: Fusiongnition Research Experiment (FIRE) Collection: Plasma Physics and Fusion 37 ITER --"INTERNATIONAL THERMONUCLEAR EXPERIMENTAL RESEARCH PROGRAM". Summary:...

172

E-Print Network 3.0 - advanced fusion material Sample Search...  

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

Physics and Fusion 5 Fusion Energy Program Presentation to Summary: International Thermonuclear Experimental Reactor Plasma Technologies Fusion Technologies Advanced Materials......

173

U.S. Department of Energy Office of Inspector General Annual...  

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

Carbon Fiber Technology Center The Department of Energy's International Thermonuclear Experimental Reactor (ITER) Responsibilities Depleted Uranium Operations at...

174

E-Print Network 3.0 - advanced fission reactors Sample Search...  

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

fission reactors, which release energy by splitting atoms... ) International Thermonuclear Experimental Reactor (ITER), which will be ... Source: Fusiongnition Research...

175

E-Print Network 3.0 - advanced tokamak plasmas Sample Search...  

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

Physics and Fusion 15 Fusion Energy Program Presentation to Summary: International Thermonuclear Experimental Reactor Plasma Technologies Fusion Technologies Advanced Materials......

176

Annual Performance Report and Plan FY12 FY13 FY14  

Energy Savers [EERE]

Carbon Fiber Technology Center The Department of Energy's International Thermonuclear Experimental Reactor (ITER) Responsibilities Depleted Uranium Operations at...

177

E-Print Network 3.0 - advanced deuterium fusion Sample Search...  

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

Physics and Fusion 2 Fusion Energy Program Presentation to Summary: International Thermonuclear Experimental Reactor Plasma Technologies Fusion Technologies Advanced Materials......

178

Laser-driven acceleration of a dense matter up to 'thermonuclear' velocities  

Science Journals Connector (OSTI)

The results of theoretical studies and numerical simulations of laser-driven acceleration of a flat foil up to ultrahigh velocity of the order of 1000?km?s?1, which corresponds to the achievement of thermonuclear temperatures due to kinetic energy transition into thermal energy at an inelastic impact, are reported. The behavior of a foil accelerated to such high velocities, in particular, the distribution of foil density, which defines thermonuclear reaction intensity, has been studied. The calculation results are compared with the results of the experiments performed on the Gekko/HIPER laser, where a laser-driven projectile achieved record-breaking velocity. The laser pulse and foil parameters responsible for acceleration of the projectile up to 'thermonuclear' velocities in a dense state have been determined.

S Yu Gus'kov; H Azechi; N N Demchenko; V V Demchenko; I Ya Doskoch; M Murakami; H Nagatomo; V B Rozanov; S Sakaiya; R V Stepanov; N V Zmitrenko

2007-01-01T23:59:59.000Z

179

INTERNATIONAL AGREEMENTS  

Office of Environmental Management (EM)

for cooperation in the peaceful uses of nuclear energy, including controlled thermonuclear fusion, and, in particular, contributions towards multilateral projects; Desiring...

180

On the Stability of Thermonuclear Burning Fronts in Type Ia Supernovae  

E-Print Network [OSTI]

The propagation of cellularly stabilized thermonuclear flames is investigated by means of numerical simulations. In Type Ia supernova explosions the corresponding burning regime establishes at scales below the Gibson length. The cellular flame stabilization - which is a result of an interplay between the Landau-Darrieus instability and a nonlinear stabilization mechanism - is studied for the case of propagation into quiescent fuel as well as interaction with vortical fuel flows. Our simulations indicate that in thermonuclear supernova explosions stable cellular flames develop around the Gibson scale and that deflagration-to-detonation transition is unlikely to be triggered from flame evolution effects here.

F. K. Roepke; W. Hillebrandt

2004-04-26T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


181

Puzzling thermonuclear burst behaviour from the transient low-mass X-ray binary IGR J17473–2721  

Science Journals Connector (OSTI)

......hereafter G08]. Only a few observations of thermonuclear flashes occurring before the start of...bursts with the energy released by the thermonuclear bursts. Their ratio is the alpha parameter...superburst or the onset of a stable He fusion process. Again, it is interesting......

J. Chenevez; D. Altamirano; D. K. Galloway; J. J. M. in 't Zand; E. Kuulkers; N. Degenaar; M. Falanga; E. Del Monte; Y. Evangelista; M. Feroci; E. Costa

2011-01-01T23:59:59.000Z

182

Contrib. Plasma Phys. 53, No. 45, 397 405 (2013) / DOI 10.1002/ctpp.201200094 Electron screening effect on stellar thermonuclear fusion  

E-Print Network [OSTI]

effect on stellar thermonuclear fusion Alexander Y. Potekhin1,2 and Gilles Chabrier2,3 1 Ioffe Physical thermonuclear reactions for various stellar objects, namely in the liquid envelopes of neutron stars. In addition, we examine some recent unconventional theo- retical results on stellar thermonuclear fusions

183

PHYS 390 Lecture 20 -Reactions III -Thermonuclear processes 20 -1 2001 by David Boal, Simon Fraser University. All rights reserved; further resale or copying is strictly prohibited.  

E-Print Network [OSTI]

PHYS 390 Lecture 20 - Reactions III - Thermonuclear processes 20 - 1 © 2001 by David Boal, Simon - Reactions III - Thermonuclear processes What's Important: · energy-dependent cross sections · complete rate 20 - Reactions III - Thermonuclear processes 20 - 2 © 2001 by David Boal, Simon Fraser University

Boal, David

184

Mon. Not. R. Astron. Soc. 401, 26 (2010) doi:10.1111/j.1365-2966.2009.15632.x Systematic variation in the apparent burning area of thermonuclear  

E-Print Network [OSTI]

in the apparent burning area of thermonuclear bursts and its implication for neutron star radius measurement Sudip area during the decay portions of thermonuclear (type I) X-ray bursts. However, this apparent area are challenging. Thermonuclear bursts provide one of the very few promising methods to measure the neutron star

Miller, Cole

185

Complex workplace radiation fields at European high-energy accelerators and thermonuclear fusion facilities  

E-Print Network [OSTI]

This report outlines the research needs and research activities within Europe to develop new and improved methods and techniques for the characterization of complex radiation fields at workplaces around high-energy accelerators and the next generation of thermonuclear fusion facilities under the auspices of the COordinated Network for RAdiation Dosimetry (CONRAD) project funded by the European Commission.

Bilski, P; D'Errico, F; Esposito, A; Fehrenbacher, G; Fernàndez, F; Fuchs, A; Golnik, N; Lacoste, V; Leuschner, A; Sandri, S; Silari, M; Spurny, F; Wiegel, B; Wright, P

2006-01-01T23:59:59.000Z

186

Millihertz quasi-periodic oscillations and thermonuclear bursts from Terzan 5: A showcase of burning regimes  

E-Print Network [OSTI]

We present a comprehensive study of the thermonuclear bursts and millihertz quasi-periodic oscillations (mHz QPOs) from the neutron star (NS) transient and 11 Hz X-ray pulsar IGR J17480–2446, located in the globular cluster ...

Linares, M.

187

Experimental study on heat transfer characteristics of internal heat exchangers for CO2 system under cooling condition  

Science Journals Connector (OSTI)

This paper presents the heat transfer characteristics of the internal heat exchanger (IHX) for CO2 heat pump system. The influence on the IHX length, the mass flow rate, the shape of IHX, the operating condition,...

Young Chul Kwon; Dae Hoon Kim; Jae Heon Lee…

2009-03-01T23:59:59.000Z

188

Also on the agenda would be  

E-Print Network [OSTI]

the multi- billion dollar International Thermonuclear Experimental Reactor (ITER), one of the most exciting the multi-billion dollar International Thermonuclear Experimental Reactor (ITER), one of the most exciting International Thermonuclear French President Jacques Chirac Six Month World Exposition Beijing Tiananmen Square

189

Experimental Capabilities  

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

laser system. A major focus of NIF is a national effort to demonstrate ignition and thermonuclear burn in the laboratory. NIF also conducts a variety of experiments to study matter...

190

CONDENSATION IN EJECTA FROM DENSE THERMONUCLEAR SUPERNOVAE. T. Yu1, B. S. Meyer1, A. V. Fedkin2, and L. Grossman2,3, 1Department of Physics and Astronomy, Clemson University, Clemson, SC  

E-Print Network [OSTI]

CONDENSATION IN EJECTA FROM DENSE THERMONUCLEAR SUPERNOVAE. T. Yu1, B. S. Meyer1, A. V. Fedkin2 Thermonuclear Supernova Model: Thermonuclear (Type Ia) supernovae are explosions of white dwarf stars. Our model and then oxy- gen burning proceed under degenerate conditions, a thermonuclear runaway occurs, which leads

Grossman, Lawrence

191

Govt may concede ITER site to France The Yomiuri Shimbun  

E-Print Network [OSTI]

the building of the planned International Thermonuclear Experimental Reactor in another country providing Japan is an experimental facility of thermonuclear fusion, at which nuclear fusion reactions that occur on the sun

192

A meeting is planned Tuesday  

E-Print Network [OSTI]

Thermonuclear Experimental Reactor (ITER) -- a test bed for what is being billed as a safe and inexhaustible | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Google It: International Thermonuclear Spokesman Fabio Fabbi Questions Eu Optimism Experimental Reactor

193

Charged-Particle Thermonuclear Reaction Rates: III. Nuclear Physics Input  

E-Print Network [OSTI]

The nuclear physics input used to compute the Monte Carlo reaction rates and probability density functions that are tabulated in the second paper of this series (Paper II) is presented. Specifically, we publish the input files to the Monte Carlo reaction rate code RatesMC, which is based on the formalism presented in the first paper of this series (Paper I). This data base contains overwhelmingly experimental nuclear physics information. The survey of literature for this review was concluded in November 2009.

Christian Iliadis; Richard Longland; Art Champagne; Alain Coc

2010-04-23T23:59:59.000Z

194

THE FERMI-GBM X-RAY BURST MONITOR: THERMONUCLEAR BURSTS FROM 4U 0614+09  

E-Print Network [OSTI]

Thermonuclear bursts from slowly accreting neutron stars (NSs) have proven difficult to detect, yet they are potential probes of the thermal properties of the NS interior. During the first year of a systematic all-sky ...

Connaughton, V.

195

Thermonuclear fusion in dense stars: Electron screening, conductive cooling, and magnetic field effects  

E-Print Network [OSTI]

We study the plasma correlation effects on nonresonant thermonuclear reactions of carbon and oxygen in the interiors of white dwarfs and liquid envelopes of neutron stars. We examine the effects of electron screening on thermodynamic enhancement of thermonuclear reactions in dense plasmas beyond the linear mixing rule. Using these improved enhancement factors, we calculate carbon and oxygen ignition curves in white dwarfs and neutron stars. The energy balance and ignition conditions in neutron star envelopes are evaluated, taking their detailed thermal structure into account. The result is compared to the simplified "one-zone model," which is routinely used in the literature. We also consider the effect of strong magnetic fields on the ignition curves in the ocean of magnetars.

Potekhin, A Y

2012-01-01T23:59:59.000Z

196

Compression and combustion of non-cryogenic targets with a solid thermonuclear fuel for inertial fusion  

SciTech Connect (OSTI)

Variants of a target with a solid thermonuclear fuel in the form of deuterium-tritium hydrides of light metals for an inertial fusion have been proposed. The laser-pulse-induced compression of non-cryogenic targets, as well as ignition and combustion of such targets, has been examined. The numerical calculations show that, despite a decrease in the caloric content of the fuel and an increase in the energy losses on intrinsic radiation in the target containing deuterium-tritium hydrides of light metals as compared to the target containing deuterium-tritium ice, the non-cryogenic target can ensure the fusion gain sufficient for its use in the energy cycle of a thermonuclear power plant based on the inertial plasma confinement method.

Gus'kov, S. Yu., E-mail: guskov@sci.lebedev.ru [Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation); Zmitrenko, N. V. [Russian Academy of Sciences, Keldysh Institute of Applied Mathematics (Russian Federation); Sherman, V. E. [St. Petersburg State Polytechnic University (Russian Federation)

2013-04-15T23:59:59.000Z

197

Oscillations During Thermonuclear X-ray Bursts: A New Probe of Neutron Stars  

E-Print Network [OSTI]

Observations of thermonuclear (Type I) X-ray bursts from neutron stars in low mass X-ray binaries (LMXB) with the Rossi X-ray Timing Explorer (RXTE) have revealed large amplitude, high coherence X-ray brightness oscillations with frequencies in the 300 - 600 Hz range. Substantial spectral and timing evidence point to rotational modulation of the X-ray burst flux as the cause of these oscillations, and it is likely that they reveal the spin frequencies of neutron stars in LMXB from which they are detected. Here I review the status of our knowledge of these oscillations and describe how they can be used to constrain the masses and radii of neutron stars as well as the physics of thermonuclear burning on accreting neutron stars.

Tod E. Strohmayer

1999-11-19T23:59:59.000Z

198

The variation of the fine structure constant: testing the dipole model with thermonuclear supernovae  

E-Print Network [OSTI]

The large-number hypothesis conjectures that fundamental constants may vary. Accordingly, the spacetime variation of fundamental constants has been an active subject of research for decades. Recently, using data obtained with large telescopes a phenomenological model in which the fine structure constant might vary spatially has been proposed. We test whether this hypothetical spatial variation of {\\alpha}, which follows a dipole law, is compatible with the data of distant thermonuclear supernovae. Unlike previous works, in our calculations we consider not only the variation of the luminosity distance when a varying {\\alpha} is adopted, but we also take into account the variation of the peak luminosity of Type Ia supernovae resulting from a variation of {\\alpha}. This is done using an empirical relation for the peak bolometric magnitude of thermonuclear supernovae that correctly reproduces the results of detailed numerical simulations. We find that there is no significant difference between the several phenome...

Kraiselburd, Lucila; Negrelli, Carolina; Berro, Enrique García

2014-01-01T23:59:59.000Z

199

The 63Cu(?, p)66Zn cross section and the corresponding thermonuclear reaction rate  

Science Journals Connector (OSTI)

Differential cross sections and excitation functions for the reaction 63Cu(?, p)66Zn have been measured over the energy range E? = 6–10 MeV. Results of statistical model calculations are compared to the excitation functions for individual proton groups and are found to give good representations to within about a factor of two. The data and the calculated cross sections are used to determine the thermonuclear reaction rates for temperatures of astrophysical interest.

M.S. Islam; R.N. Boyd; P.B. Corn; D.P. Rath; X. Gu; G.W. Kolnicki

1989-01-01T23:59:59.000Z

200

Lightcurves of thermonuclear supernovae as a probe of the explosion mechanism and their use in cosmology  

E-Print Network [OSTI]

Thermonuclear supernovae are valuable for cosmology but their physics is not yet fully understood. Modeling the development and propagation of nuclear flame is complicated by numerous instabilities. The predictions of supernova light curves still involve some simplifying assumptions, but one can use the comparison of the computed fluxes with observations to constrain the explosion mechanism. In spite of great progress in recent years, a number of issues remains unsolved both in flame physics and light curve modeling.

S. Blinnikov; E. Sorokina

2002-12-30T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


201

Thermonuclear Runaways on Accreting White Dwarfs: Models of Classical Novae Explosions  

E-Print Network [OSTI]

The mechanism of classical novae explosions is explained, together with some of their observational properties. The scarce but not null impact of novae in the chemical evolution of the Milky Way is analyzed, as well as their relevance for the radioactivity in the Galaxy. A special emphasis is given to the predicted gamma-ray emission from novae and its relationship with the thermonuclear model itself and its related nucleosynthesis.

Margarita Hernanz; Jordi Jose

2000-01-11T23:59:59.000Z

202

Application of a new screening model to thermonuclear reactions of the rp process  

E-Print Network [OSTI]

A new screening model for astrophysical thermonuclear reactions was derived recently which improved Salpeter's weak-screening one. In the present work we prove that the new model can also give very reliable screening enhancement factors (SEFs) when applied to the rp process. According to the results of the new model, which agree well with Mitler's SEFs, the screened rp reaction rates can be, at most, twice as fast as the unscreened ones.

Theodore Liolios

2003-05-09T23:59:59.000Z

203

A revised thermonuclear rate of $^{7}$Be($n$,$\\alpha$)$^{4}$He relevant to Big-Bang nucleosynthesis  

E-Print Network [OSTI]

In the standard Big-Bang nucleosynthesis (BBN) model, the primordial $^7$Li abundance is overestimated by about a factor of 2--3 comparing to the astronomical observations, so called the pending cosmological lithium problem. The $^7$Be($n$,$\\alpha$)$^4$He reaction, which may affect the $^7$Li abundance, was regarded as the secondary important reaction in destructing the $^7$Be nucleus in BBN. However, the thermonuclear rate of $^7$Be($n$,$\\alpha$)$^4$He has not been well studied so far. This reaction rate was firstly estimated by Wagoner in 1969, which has been generally adopted in the current BBN simulations and the reaction rate library. This simple estimation involved only a direct-capture reaction mechanism, but the resonant contribution should be also considered according to the later experimental results. In this work, we have revised this rate based on the indirect cross-section data available for the $^4$He($\\alpha$,$n$)$^7$Be and $^4$He($\\alpha$,$p$)$^7$Li reactions, with the charge symmetry and deta...

Hou, S Q; Kubono, S; Chen, Y S

2015-01-01T23:59:59.000Z

204

Thermonuclear explosion of rotating massive stars could explain core-collapse supernovae  

E-Print Network [OSTI]

It is widely thought that core-collapse supernovae (CCSNe), the explosions of massive stars following the collapse of the stars' iron cores, is obtained due to energy deposition by neutrinos. So far, this scenario was not demonstrated from first principles. Kushnir and Katz (2014) have recently shown, by using one-dimensional simulations, that if the neutrinos failed to explode the star, a thermonuclear explosion of the outer shells is possible for some (tuned) initial profiles. However, the energy released was small and negligible amounts of ejected $^{56}$Ni were obtained, implying that these one-dimensional collapse induced thermonuclear explosions (CITE) are unlikely to represent typical CCSNe. Here I provide evidence supporting a scenario in which the majority of CCSNe are the result of CITE. I use two-dimensional simulations to show that collapse of stars that include slowly (few percent of breakup) rotating $\\sim0.1-10\\,M_{\\odot}$ shells of mixed helium-oxygen, leads to an ignition of a thermonuclear d...

Kushnir, Doron

2015-01-01T23:59:59.000Z

205

Vegetation and Ecological Characteristics of Mixed-Conifer and Red Fir Forests at the Teakettle Experimental Forest Anonymous. 1970. Recommendations for an international standard for a mapping method in bird  

E-Print Network [OSTI]

Vegetation and Ecological Characteristics of Mixed-Conifer and Red Fir Forests at the Teakettle-1192. Fiegener, Rob. 2002. A fire history of mixed conifer at the Teakettle Experimental Forest. Unpublished Experimental Forest References Anonymous. 1970. Recommendations for an international standard for a mapping

Standiford, Richard B.

206

Contribution of different mechanisms of energy transfer in the development of the thermonuclear combustion wave upon fast ignition of ICF-targets  

Science Journals Connector (OSTI)

Temporal characteristics of the thermonuclear combustion wave, critical parameters of the igniter ... fast ignition of the spherically symmetric inertial confinement fusion (ICF) target of the reactor type ... co...

N. B. Gubinskaya; S. Yu. Gus’kov; D. V. Il’in…

2008-01-01T23:59:59.000Z

207

DOE LAUNCHES R&D BLUEPRINT  

Science Journals Connector (OSTI)

The highest priority item is the International Thermonuclear Experimental Reactor (ITER), a $5 billion fusion reactor being developed by an international consortium of countries. ...

JEFF JOHNSON

2003-11-17T23:59:59.000Z

208

U.S. and China Announce Cooperation on FutureGen and Sign Energy...  

Energy Savers [EERE]

a Hydrogen Economy; the Carbon Sequestration Leadership Forum; the International Thermonuclear Experimental Reactor; and the Generation IV International Forum. Secretary Bodman...

209

E-Print Network 3.0 - athene reactor Sample Search Results  

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

which country... will host a nuclear fusion reactor for the International Thermonuclear Experimental Reactor (ITER) project... . The candidate sites for the international...

210

On the Thermonuclear Runaway in Type Ia Supernovae: How to Run Away?  

Science Journals Connector (OSTI)

Type Ia supernovae (SNe Ia) are thought to be thermonuclear explosions of massive white dwarfs (WDs). We present the first study of multidimensional effects during the final hours prior to the thermonuclear runaway that leads to the explosion. The calculations utilize an implicit, two-dimensional hydrodynamic code. Mixing and the ignition process are studied in detail. We find that the initial chemical structure of the WD is changed, but the material is not fully homogenized. In particular, the exploding WD sustains a central region with a low C/O ratio. This implies that the explosive nuclear burning will begin in a partially carbon-depleted environment. The thermonuclear runaway happens in a well-defined region close to the center. It is induced by compressional heat when matter is brought inward by convective flows. We find no evidence for multiple spot or strong off-center ignition. Convective velocities in the WD are on the order of 100 km s-1, which is well above the effective burning speeds in SNe Ia previously expected right after the runaway. In our calculations, the ignition occurs near the center. Then, for ? 0.5-1 s, the speed of the burning front will neither be determined by the laminar speed nor the Rayleigh-Taylor instabilities but by convective flows produced prior to the runaway. The consequences are discussed for our understanding of the detailed physics of the flame propagation, the deflagration to detonation transition, and the nucleosynthesis in the central layers. Our results strongly suggest the preconditioning of the progenitor as a key factor for our understanding of the diversity in SNe Ia.

P. Höflich; J. Stein

2002-01-01T23:59:59.000Z

211

A Characterization of the Brightness Oscillations During Thermonuclear Bursts From 4U 1636-536  

E-Print Network [OSTI]

The discovery of nearly coherent brightness oscillations during thermonuclear X-ray bursts from six neutron-star low-mass X-ray binaries has opened up a new way to study the propagation of thermonuclear burning, and may ultimately lead to greater understanding of thermonuclear propagation in other astrophysical contexts, such as in Type Ia supernovae. Here we report detailed analyses of the ~580 Hz brightness oscillations during bursts from 4U 1636-536. We investigate the bursts as a whole and, in more detail, the initial portions of the bursts. We analyze the ~580 Hz oscillations in the initial 0.75 seconds of the five bursts that were used in a previous search for a brightness oscillation at the expected ~290 Hz spin frequency, and find that if the same frequency model describes all five bursts there is insufficient data to require more than a constant frequency or, possibly, a frequency plus a frequency derivative. Therefore, although it is appropriate to use an arbitrarily complicated model of the ~580 Hz oscillations to generate a candidate waveform for the ~290 Hz oscillations, models with more than two parameters are not required by the data. For the bursts as a whole we show that the characteristics of the brightness oscillations vary greatly from burst to burst. We find, however, that in at least one of the bursts, and possibly in three of the four that have strong brightness oscillations throughout the burst, the oscillation frequency reaches a maximum several seconds into the burst and then decreases. This behavior has not been reported previously for burst brightness oscillations, and it poses a challenge to the standard burning layer expansion explanation for the frequency changes.

M. Coleman Miller

1999-04-08T23:59:59.000Z

212

On the Thermonuclear Runaway in Type Ia Supernovae: How to run away?  

E-Print Network [OSTI]

Type Ia Supernovae are thought to be thermonuclear explosions of massive white dwarfs (WD). We present the first study of multi-dimensional effects during the final hours prior to the thermonuclear runaway which leads to the explosion. The calculations utilize an implicit, 2-D hydro code.Mixing and the ignition process are studied in detail. We find that the initial chemical structure of the WD is changed but the material is not fully homogenized. The exploding WD sustains a central region with a low C/O ratio. This implies that the explosive nuclear burning will begin in a partially C-depleted environment. The thermonuclear runaway happens in a well defined region close to the center. It is induced by compressional heat when matter is brought inwards by convective flows. We find no evidence for multiple spot or strong off-center ignition. Convective velocities are of the order of 100 km/sec which is well above the effective burning speeds in SNe Ia previously expected right after the runaway. For about 0.5 to 1 sec, the speed of the burning front will neither be determined by the laminar speed nor the Rayleigh-Taylor instabilities but by convective flows produced prior to the runaway. The consequences are discussed for our under- standing of the detailed physics of the flame propagation, the deflagration detonation transition, and the nucleosynthesis in the central layers. Our results strongly suggest the pre-conditioning of the progenitor as a key-factor for our understanding of the diversity in SNeIa.

P. Hoeflich; J. Stein

2001-12-07T23:59:59.000Z

213

Enhancement of Resonant Thermonuclear Reaction Rates in Extremely Dense Stellar Plasmas  

E-Print Network [OSTI]

The enhancement factor of the resonant thermonuclear reaction rates is calculated for the extremely dense stellar plasmas in the liquid phase. In order to calculate the enhancement factor we use the screening potential which is deduced from the numerical experiment of the classical one-component plasma. It is found that the enhancement is tremendous for white dwarf densities if the ^{12}C + ^{12}C fusion cross sections show resonant behavior in the astrophysical energy range. We summarize our numerical results by accurate analytic fitting formulae.

Naoki Itoh; Nami Tomizawa; Shinya Wanajo; Satoshi Nozawa

2002-12-06T23:59:59.000Z

214

Charged-Particle Thermonuclear Reaction Rates: IV. Comparison to Previous Work  

E-Print Network [OSTI]

We compare our Monte Carlo reaction rates (see Paper II of this series) to previous results that were obtained by using the classical method of computing thermonuclear reaction rates. For each reaction, the comparison is presented using two types of graphs: the first shows the change in reaction rate uncertainties, while the second displays our new results normalized to the previously recommended reaction rate. We find that the rates have changed significantly for almost all reactions considered here. The changes are caused by (i) our new Monte Carlo method of computing reaction rates (see Paper I of this series), and (ii) newly available nuclear physics information (see Paper III of this series).

Christian Iliadis; Richard Longland; Art Champagne; Alain Coc

2010-04-23T23:59:59.000Z

215

Results from D—T experiments on TFTR and implications for achieving an ignited plasma  

Science Journals Connector (OSTI)

...significant bursts of fusion energy per pulse. This...of the International Thermonuclear Experimental Reactor...Texas, Institute for Fusion Studies, Austin, Texas...Institute of Innovative and Thermonuclear Research, Moscow...National Institute for Fusion Science, Nagoya, Japan...

1999-01-01T23:59:59.000Z

216

Profile of Keith Moffatt  

Science Journals Connector (OSTI)

...before a major experiment carried out at the International Thermonuclear Experimental Reactor site in Cadarache, France confirmed...work on magnetic relaxation, which has implications for thermonuclear fusion devices. Similar research describes the evolution...

Farooq Ahmed

2014-01-01T23:59:59.000Z

217

A revised thermonuclear rate of $^{7}$Be($n$,$?$)$^{4}$He relevant to Big-Bang nucleosynthesis  

E-Print Network [OSTI]

In the standard Big-Bang nucleosynthesis (BBN) model, the primordial $^7$Li abundance is overestimated by about a factor of 2--3 comparing to the astronomical observations, so called the pending cosmological lithium problem. The $^7$Be($n$,$\\alpha$)$^4$He reaction, which may affect the $^7$Li abundance, was regarded as the secondary important reaction in destructing the $^7$Be nucleus in BBN. However, the thermonuclear rate of $^7$Be($n$,$\\alpha$)$^4$He has not been well studied so far. This reaction rate was firstly estimated by Wagoner in 1969, which has been generally adopted in the current BBN simulations and the reaction rate library. This simple estimation involved only a direct-capture reaction mechanism, but the resonant contribution should be also considered according to the later experimental results. In this work, we have revised this rate based on the indirect cross-section data available for the $^4$He($\\alpha$,$n$)$^7$Be and $^4$He($\\alpha$,$p$)$^7$Li reactions, with the charge symmetry and detailed-balance principle. Our new result shows that the previous rate (acting as an upper limit) is overestimated by about a factor of ten. The BBN simulation shows that the present rate leads to a 1.2\\% increase in the final $^7$Li abundance compared to the result using the Wagoner rate, and hence the present rate even worsens the $^7$Li problem. By the present estimation, the role of $^7$Be($n$,$\\alpha$)$^4$He in destroying $^7$Be is weakened from the secondary importance to the third, and the $^7$Be($d$,$p$)2$^4$He reaction becomes of secondary importance in destructing $^7$Be.

S. Q. Hou; J. J. He; S. Kubono; Y. S. Chen

2015-02-13T23:59:59.000Z

218

thermonuclear functions  

E-Print Network [OSTI]

Two representations of the extended gamma functions ? 2,0 0,2 [(b,x)] are proved. These representations are exploited to find a transformation relation between two Fox’s H-functions. These results are used to solve Fox’s H-function in terms of Meijer’s G-function for certain values of the parameters. A closed form representation of the kernel of the Bessel type integral transform is also proved. 1.

M. Aslam Chaudhry

1999-01-01T23:59:59.000Z

219

Relativistic Collapse and Explosion of Rotating Supermassive Stars with Thermonuclear Effects  

Science Journals Connector (OSTI)

We present results of general relativistic simulations of collapsing supermassive stars with and without rotation using the two-dimensional general relativistic numerical code Nada, which solves the Einstein equations written in the BSSN formalism and the general relativistic hydrodynamic equations with high-resolution shock-capturing schemes. These numerical simulations use an equation of state that includes the effects of gas pressure and, in a tabulated form, those associated with radiation and the electron-positron pairs. We also take into account the effect of thermonuclear energy released by hydrogen and helium burning. We find that objects with a mass of ?5 ? 105 M ? and an initial metallicity greater than Z CNO ? 0.007 do explode if non-rotating, while the threshold metallicity for an explosion is reduced to Z CNO ? 0.001 for objects uniformly rotating. The critical initial metallicity for a thermonuclear explosion increases for stars with a mass ?106 M ?. For those stars that do not explode, we follow the evolution beyond the phase of black hole (BH) formation. We compute the neutrino energy loss rates due to several processes that may be relevant during the gravitational collapse of these objects. The peak luminosities of neutrinos and antineutrinos of all flavors for models collapsing to a BH are L ? ~ 1055 erg s–1. The total radiated energy in neutrinos varies between E ? ~ 1056 erg for models collapsing to a BH and E ? ~ 1045-1046 erg for models exploding.

Pedro J. Montero; Hans-Thomas Janka; Ewald Müller

2012-01-01T23:59:59.000Z

220

Thermonuclear .Ia Supernovae from Helium Shell Detonations: Explosion Models and Observables  

Science Journals Connector (OSTI)

During the early evolution of an AM Canum Venaticorum system, helium is accreted onto the surface of a white dwarf under conditions suitable for unstable thermonuclear ignition. The turbulent motions induced by the convective burning phase in the He envelope become strong enough to influence the propagation of burning fronts and may result in the onset of a detonation. Such an outcome would yield radioactive isotopes and a faint rapidly rising thermonuclear ".Ia" supernova. In this paper, we present hydrodynamic explosion models and observable outcomes of these He shell detonations for a range of initial core and envelope masses. The peak UVOIR bolometric luminosities range by a factor of 10 (from 5 ? 1041 to 5 ? 1042 erg s–1), and the R-band peak varies from M R,peak = –15 to –18. The rise times in all bands are very rapid (40Ca through 56Ni) and unburnt He. Thus, the spectra around peak light lack signs of intermediate-mass elements and are dominated by Ca II and Ti II features, with the caveat that our radiative transfer code does not include the nonthermal effects necessary to produce He features.

Ken J. Shen; Dan Kasen; Nevin N. Weinberg; Lars Bildsten; Evan Scannapieco

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" from the National Library of EnergyBeta (NLEBeta).
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221

Relativistic collapse and explosion of rotating supermassive stars with thermonuclear effects  

E-Print Network [OSTI]

We present results of general relativistic simulations of collapsing supermassive stars with and without rotation using the two-dimensional general relativistic numerical code Nada, which solves the Einstein equations written in the BSSN formalism and the general relativistic hydrodynamics equations with high resolution shock capturing schemes. These numerical simulations use an equation of state which includes effects of gas pressure, and in a tabulated form those associated with radiation and the electron-positron pairs. We also take into account the effect of thermonuclear energy released by hydrogen and helium burning. We find that objects with a mass of 5x10^{5} solar mass and an initial metallicity greater than Z_{CNO}~0.007 do explode if non-rotating, while the threshold metallicity for an explosion is reduced to Z_{CNO}~0.001 for objects uniformly rotating. The critical initial metallicity for a thermonuclear explosion increases for stars with mass ~10^{6} solar mass. For those stars that do not explode we follow the evolution beyond the phase of black hole formation. We compute the neutrino energy loss rates due to several processes that may be relevant during the gravitational collapse of these objects. The peak luminosities of neutrinos and antineutrinos of all flavors for models collapsing to a BH are ~10^{55} erg/s. The total radiated energy in neutrinos varies between ~10^{56} ergs for models collapsing to a BH, and ~10^{45}-10^{46} ergs for models exploding.

Pedro J. Montero; Hans-Thomas Janka; Ewald Mueller

2012-02-01T23:59:59.000Z

222

Relics of metal-free low mass stars exploding as thermonuclear supernovae  

E-Print Network [OSTI]

Renewed interest in the first stars that were formed in the universe has led to the discovery of extremely iron-poor stars. Since several competing scenarios exist, our understanding of the mass range that determines the observed elemental abundances remains unclear. In this study, we consider three well-studied metal-poor stars in terms of the theoretical supernovae (SNe) model. Our results suggest that the observed abundance patterns in the metal-poor star BD +80 245 and the pair of stars HD 134439/40 agree strongly with the theoretical possibility that these stars inherited their heavy element abundance patterns from SNe initiated by thermonuclear runaways in the degenerate carbon-oxygen cores of primordial asymptotic giant branch stars with \\~3.5-5 solar masses. Recent theoretical calculations have predicted that such SNe could be originated from metal-free stars in the intermediate mass range. On the other hand, intermediate mass stars containing some metals would end their lives as white dwarfs after expelling their envelopes in the wind due to intense momentum transport from outgoing photons to heavy elements. This new pathway for the formation of SNe requires that stars are formed from the primordial gas. Thus, we suggest that stars of a few solar masses were formed from the primordial gas and that some of them caused thermonuclear explosions when the mass of their degenerate carbon-oxygen cores increased to the Chandrasekhar limit without experiencing efficient mass loss.

Takuji Tsujimoto; Toshikazu Shigeyama

2006-01-16T23:59:59.000Z

223

Level set simulations of turbulent thermonuclear deflagration in degenerate carbon and oxygen  

E-Print Network [OSTI]

We study the dynamics of thermonuclear flames propagating in fuel stirred by stochastic forcing. The fuel consists of carbon and oxygen in a state which is encountered in white dwarfs close to the Chandrasekhar limit. The level set method is applied to represent the flame fronts numerically. The computational domain for the numerical simulations is cubic, and periodic boundary conditions are imposed. The goal is the development of a suitable flame speed model for the small-scale dynamics of turbulent deflagration in thermonuclear supernovae. Because the burning process in a supernova explosion is transient and spatially inhomogeneous, the localised determination of subgrid scale closure parameters is essential. We formulate a semi-localised model based on the dynamical equation for the subgrid scale turbulence energy $k_{\\mathrm{sgs}}$. The turbulent flame speed $s_{\\mathrm{t}}$ is of the order $\\sqrt{2k_{\\mathrm{sgs}}}$. In particular, the subgrid scale model features a dynamic procedure for the calculation of the turbulent energy transfer from resolved toward subgrid scales, which has been successfully applied to combustion problems in engineering. The options of either including or suppressing inverse energy transfer in the turbulence production term are compared. In combination with the piece-wise parabolic method for the hydrodynamics, our results favour the latter option. Moreover, different choices for the constant of proportionality in the asymptotic flame speed relation, $s_{\\mathrm{t}}\\propto\\sqrt{2k_{\\mathrm{sgs}}}$, are investigated.

W. Schmidt; W. Hillebrandt; J. C. Niemeyer

2005-08-02T23:59:59.000Z

224

Thermonuclear Burning on the Accreting X-Ray Pulsar GRO J1744-28  

E-Print Network [OSTI]

We investigate the thermal stability of nuclear burning on the accreting X-ray pulsar GRO J1744-28. The neutron star's dipolar magnetic field is thermonuclear instabilities are unlikely causes of the hourly bursts seen at very high accretion rates. We then discuss how the stability of the thermonuclear burning depends on both the global accretion rate and the neutron star's magnetic field strength. We emphasize that the appearance of the instability (i.e., whether it looks like a Type I X-ray burst or a flare lasting a few minutes) will yield crucial information on the neutron star's surface magnetic field and the role of magnetic fields in convection. We suggest that a thermal instability in the accretion disk is the origin of the long (~300 days) outburst and that the recurrence time of these outbursts is >50 years. We also discuss the nature of the binary and point out that a velocity measurement of the stellar companion (most likely a Roche-lobe filling giant with m_K>17) will constrain the neutron star mass.

Lars Bildsten; Edward F. Brown

1996-09-23T23:59:59.000Z

225

Magnetic burial and the harmonic content of millisecond oscillations in thermonuclear X-ray bursts  

E-Print Network [OSTI]

Matter accreting onto the magnetic poles of a neutron star spreads under gravity towards the magnetic equator, burying the polar magnetic field and compressing it into a narrow equatorial belt. Steady-state, Grad-Shafranov calculations with a self-consistent mass-flux distribution (and a semi-quantitative treatment of Ohmic diffusion) show that, for $\\Ma \\gtrsim 10^{-5}\\Msun$, the maximum field strength and latitudinal half-width of the equatorial magnetic belt are $B_{\\rm max} = 5.6\\times 10^{15} (\\Ma/10^{-4}\\Msun)^{0.32}$ G and $\\Delta\\theta = \\max[3^{\\circ} (\\Ma/10^{-4}\\Msun)^{-1.5},3^{\\circ} (\\Ma/10^{-4}\\Msun)^{0.5}(\\dot{M}_{\\rm a}/10^{-8}\\Msun {\\rm yr}^{-1})^{-0.5}]$ respectively, where $\\Ma$ is the total accreted mass and $\\dot{M}_{\\rm a}$ is the accretion rate. It is shown that the belt prevents north-south heat transport by conduction, convection, radiation, and ageostrophic shear. This may explain why millisecond oscillations observed in the tails of thermonuclear (type I) X-ray bursts in low-mass X-ray binaries are highly sinusoidal: the thermonuclear flame is sequestered in the magnetic hemisphere which ignites first. The model is also consistent with the occasional occurrence of closely spaced pairs of bursts. Time-dependent, ideal-magnetohydrodynamic simulations confirm that the equatorial belt is not disrupted by Parker and interchange instabilities.

D. J. B. Payne; A. Melatos

2006-07-11T23:59:59.000Z

226

Thermonuclear Flame Spreading on Rapidly Spinning Neutron Stars: Indications of the Coriolis Force?  

E-Print Network [OSTI]

Millisecond period brightness oscillations during the intensity rise of thermonuclear X-ray bursts are likely caused by an azimuthally asymmetric, expanding burning region on the stellar surface. The time evolution of the oscillation amplitude during the intensity rise encodes information on how the thermonuclear flames spread across the stellar surface. This process depends on properties of the accreted burning layer, surface fluid motions, and the surface magnetic field structure, and thus can provide insight into these stellar properties. We present two examples of bursts from different sources that show a decrease in oscillation amplitude during the intensity rise. Using theoretical modeling, we demonstrate that the observed amplitude evolution of these bursts is not well described by a uniformly expanding circular burning region. We further show that by including in our model the salient aspects of the Coriolis force (as described by Spitkovsky, Levin, and Ushomirsky) we can qualitatively reproduce the observed evolution curves. Our modeling shows that the evolutionary structure of burst oscillation amplitude is sensitive to the nature of flame spreading, while the actual amplitude values can be very useful to constrain some source parameters.

Sudip Bhattacharyya; Tod E. Strohmayer

2007-08-27T23:59:59.000Z

227

Plasma Barodiffusion in Inertial-Confinement-Fusion Implosions: Application to Observed Yield Anomalies in Thermonuclear Fuel Mixtures  

E-Print Network [OSTI]

Anomalies in Thermonuclear Fuel Mixtures Peter Amendt, O. L. Landen, and H. F. Robey Lawrence Livermore National Laboratory, Livermore, California 94551, USA C. K. Li and R. D. Petrasso Plasma Science and Fusion performance in general, and upcoming igni- tion tuning campaigns on the National Ignition Facility (NIF) [4

228

Spreading of Thermonuclear Flames on the Neutron Star in SAX J1808.4-3658: An Observational Tool  

Science Journals Connector (OSTI)

We analyze archival Rossi X-Ray Timing Explorer (RXTE) proportional counter array (PCA) data of thermonuclear X-ray bursts from the 2002 outburst of the accreting millisecond pulsar SAX J1808.4-3658. We present evidence of nonmonotonic variations of oscillation frequency during burst rise, and correlations among the time evolution of the oscillation frequency, amplitude, and the inferred burning region area. We also find that the amplitude and burning region area evolutions are consistent with thermonuclear flames spreading on the neutron star surface. Based on this discussion, we infer that for the 2002 October 15 thermonuclear burst, the ignition likely occurred in the midlatitudes, the burning region took ~0.2 s to nearly encircle the equatorial region of the neutron star, and after that the lower amplitude oscillation originated from the remaining asymmetry of the burning front in the same hemisphere where the burst ignited. Our observational findings and theoretical discussion indicate that studies of the evolution of burst oscillation properties during burst rise can provide a powerful tool to understand thermonuclear flame spreading on neutron star surfaces under extreme physical conditions.

Sudip Bhattacharyya; Tod E. Strohmayer

2006-01-01T23:59:59.000Z

229

Spreading of thermonuclear flames on the neutron star in SAX J1808.4-3658: an observational tool  

E-Print Network [OSTI]

We analyse archival Rossi X-Ray Timing Explorer (RXTE) proportional counter array (PCA) data of thermonuclear X-ray bursts from the 2002 outburst of the accreting millisecond pulsar SAX J1808.4-3658. We present evidence of nonmonotonic variations of oscillation frequency during burst rise, and correlations among the time evolution of the oscillation frequency, amplitude, and the inferred burning region area. We also discuss that the amplitude and burning region area evolutions are consistent with thermonuclear flame spreading on the neutron star surface. Based on this discussion, we infer that for the 2002 Oct. 15 thermonuclear burst, the ignition likely occured in the mid-latitudes, the burning region took ~ 0.2 s to nearly encircle the equatorial region of the neutron star, and after that the lower amplitude oscillation originated from the remaining asymmetry of the burning front in the same hemisphere where the burst ignited. Our observational findings and theoretical discussion indicate that studies of the evolution of burst oscillation properties during burst rise can provide a powerful tool to understand thermonuclear flame spreading on neutron star surfaces under extreme physical conditions.

Sudip Bhattacharyya; Tod E. Strohmayer

2006-04-03T23:59:59.000Z

230

Analysis of the Thermonuclear Instability including Low-Power ICRH Minority Heating in IGNITOR  

E-Print Network [OSTI]

The nonlinear thermal balance equation for classical plasma in a toroidal geometry is analytically and numerically investigated including ICRH power. The determination of the equilibrium temperature and the analysis of the stability of the solution are performed by solving the energy balance equation that includes the transport relations obtained by the kinetic theory. An estimation of the confinement time is also provided. We show that the ICRH heating in the IGNITOR experiment, among other applications, is expected to stabilize the power of the thermonuclear burning by automatic regulation of the RF coupled power. Here a scenario is considered where IGNITOR is led to operate in a slightly sub-critical regime by adding a small fraction of ${}^3He$ to the nominal 50-50 Deuterium-Tritium mixture. The difference between power lost and alpha heating is compensated by additional ICRH heating, which should be able to increase the global plasma temperature via collisions between ${}^3He$ minority and the background...

Cardinali, Alessandro

2014-01-01T23:59:59.000Z

231

Spiral Disk Instability Can Drive Thermonuclear Explosions in Binary White Dwarf Mergers  

E-Print Network [OSTI]

Thermonuclear, or Type Ia supernovae (SNe Ia), originate from the explosion of carbon-oxygen white dwarfs, and serve as standardizable cosmological candles. However, despite their importance, the nature of the progenitor systems which give rise to SNe Ia has not been hitherto elucidated. Observational evidence favors the double-degenerate channel, in which merging white dwarf binaries lead to SNe Ia. Furthermore, significant discrepancies exist between observations and theory, and to date, there has been no self-consistent merger model which yields a SNe Ia. Here we show that a spiral mode instability in the accretion disk formed during a binary white dwarf merger leads to a detonation on a dynamical timescale. This mechanism sheds light on how white dwarf mergers may frequently yield SNe Ia.

Kashyap, Rahul; García-Berro, Enrique; Aznar-Siguán, Gabriela; Ji, Suoqing; Lorén-Aguilar, Pablo

2015-01-01T23:59:59.000Z

232

Astrophysics Simulations from the ASC/Alliances Center for Astrophysical Thermonuclear Flashes  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The "Flash Center" works to solve the long-standing problem of thermonuclear flashes on the surfaces of compact stars such as neutron stars and white dwarfs, and in the interior of white dwarfs (i.e., Type I supernovae). The physical conditions, and many of the physical phenomena, are similar to those confronted by the Department of Energy Stockpile Stewardship program. The (fully ionized) plasmas are at very high temperatures and densities; and the physical problems of nuclear ignition, deflagration or detonation, turbulent mixing, and interface dynamics for complex multicomponent fluids are common to the weapons program. Because virtually every aspect of this problem represents a computational Grand Challenge, large-scale numerical simulations are at the heart of its resolution (Taken from Executive Summary page). More than 35 simulations and computer animations developed through research at the "Flash Center" are available here. Each .avi or .mov file also references the related research paper or presentation and provides a link.

233

Thermonuclear Burning Regimes and the Use of SNe Ia in Cosmology  

E-Print Network [OSTI]

The calculations of the light curves of thermonuclear supernovae are carried out by a method of multi-group radiation hydrodynamics. The effects of spectral lines and expansion opacity are taken into account. The predictions for UBVI fluxes are given. The values of rise time for B and V bands found in our calculations are in good agreement with the observed values. We explain why our results for the rise time have more solid physical justification than those obtained by other authors. It is shown that small variations in the chemical composition of the ejecta, produced in the explosions with different regimes of nuclear burning, can influence drastically the light curve decline in the B band and, to a lesser extent, in the V band. We argue that recent results on positive cosmological constant Lambda, found from the high redshift supernova observations, could be wrong in the case of possible variations of the preferred mode of nuclear burning in the earlier Universe.

E. I. Sorokina; S. I. Blinnikov; O. S. Bartunov

1999-10-02T23:59:59.000Z

234

Oxygen emission in remnants of thermonuclear supernovae as a probe for their progenitor system  

E-Print Network [OSTI]

Recent progress in numerical simulations of thermonuclear supernova explosions brings up a unique opportunity in studying the progenitors of Type Ia supernovae. Coupling state-of-the-art explosion models with detailed hydrodynamical simulations of the supernova remnant evolution and the most up-to-date atomic data for X-ray emission calculations makes it possible to create realistic synthetic X-ray spectra for the supernova remnant phase. Comparing such spectra with high quality observations of supernova remnants could allow to constrain the explosion mechanism and the progenitor of the supernova. The present study focuses in particular on the oxygen emission line properties in young supernova remnants, since different explosion scenarios predict a different amount and distribution of this element. Analysis of the soft X-ray spectra from supernova remnants in the Large Magellanic Cloud and confrontation with remnant models for different explosion scenarios suggests that SNR 0509-67.5 could originate from a de...

Kosenko, D; Kromer, M; Blinnikov, S I; Pakmor, R; Kaastra, J S

2014-01-01T23:59:59.000Z

235

Registration of the First Thermonuclear X-ray Burst from AX J1754.2-2754  

E-Print Network [OSTI]

During the analysis of the INTEGRAL observatory archival data we found a powerful X-ray burst, registered by JEM-X and IBIS/ISGRI telescopes on April 16, 2005 from a weak and poorly known source AX J1754.2-2754. Analysis of the burst profiles and spectrum shows, that it was a type I burst, which result from thermonuclear explosion on the surface of nutron star. It means that we can consider AX J1754.2-2754 as an X-ray burster. Certain features of burst profile at its initial stage witness of a radiation presure driven strong expansion and a corresponding cooling of the nutron star photosphere. Assuming, that the luminosity of the source at this phase was close to the Eddington limit, we estimated the distance to the burst source d=6.6+/-0.3 kpc (for hidrogen atmosphere of the neutron star) and d=9.2+/-0.4 kpc (for helium atmosphere).

I. V. Chelovekov; S. A. Grebenev

2007-10-30T23:59:59.000Z

236

Small-scale Interaction of Turbulence with Thermonuclear Flames in Type Ia Supernovae  

E-Print Network [OSTI]

Microscopic turbulence-flame interactions of thermonuclear fusion flames occuring in Type Ia Supernovae were studied by means of incompressible direct numerical simulations with a highly simplified flame description. The flame is treated as a single diffusive scalar field with a nonlinear source term. It is characterized by its Prandtl number, Pr << 1, and laminar flame speed, S_L. We find that if S_L ~ u', where u' is the rms amplitude of turbulent velocity fluctuations, the local flame propagation speed does not significantly deviate from S_L even in the presence of velocity fluctuations on scales below the laminar flame thickness. This result is interpreted in the context of subgrid-scale modeling of supernova explosions and the mechanism for deflagration-detonation-transitions.

J. C. Niemeyer; W. K. Bushe; G. R. Ruetsch

1999-05-07T23:59:59.000Z

237

Physics design of a 100 keV acceleration grid system for the diagnostic neutral beam for international tokamak experimental reactor  

SciTech Connect (OSTI)

This paper describes the physics design of a 100 keV, 60 A H{sup -} accelerator for the diagnostic neutral beam (DNB) for international tokamak experimental reactor (ITER). The accelerator is a three grid system comprising of 1280 apertures, grouped in 16 groups with 80 apertures per beam group. Several computer codes have been used to optimize the design which follows the same philosophy as the ITER Design Description Document (DDD) 5.3 and the 1 MeV heating and current drive beam line [R. Hemsworth, H. Decamps, J. Graceffa, B. Schunke, M. Tanaka, M. Dremel, A. Tanga, H. P. L. De Esch, F. Geli, J. Milnes, T. Inoue, D. Marcuzzi, P. Sonato, and P. Zaccaria, Nucl. Fusion 49, 045006 (2009)]. The aperture shapes, intergrid distances, and the extractor voltage have been optimized to minimize the beamlet divergence. To suppress the acceleration of coextracted electrons, permanent magnets have been incorporated in the extraction grid, downstream of the cooling water channels. The electron power loads on the extractor and the grounded grids have been calculated assuming 1 coextracted electron per ion. The beamlet divergence is calculated to be 4 mrad. At present the design for the filter field of the RF based ion sources for ITER is not fixed, therefore a few configurations of the same have been considered. Their effect on the transmission of the electrons and beams through the accelerator has been studied. The OPERA-3D code has been used to estimate the aperture offset steering constant of the grounded grid and the extraction grid, the space charge interaction between the beamlets and the kerb design required to compensate for this interaction. All beamlets in the DNB must be focused to a single point in the duct, 20.665 m from the grounded grid, and the required geometrical aimings and aperture offsets have been calculated.

Singh, M. J. [ITER-India, Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428 (India); De Esch, H. P. L. [CEA-Cadarache, IRFM, F-13108 Saint-Paul-lez-Durance (France)

2010-01-15T23:59:59.000Z

238

Development of high-speed and wide-angle visible observation diagnostics on Experimental Advanced Superconducting Tokamak using catadioptric optics  

SciTech Connect (OSTI)

A new wide-angle endoscope for visible light observation on the Experimental Advanced Superconducting Tokamak (EAST) has been recently developed. The head section of the optical system is based on a mirror reflection design that is similar to the International Thermonuclear Experimental Reactor-like wide-angle observation diagnostic on the Joint European Torus. However, the optical system design has been simplified and improved. As a result, the global transmittance of the system is as high as 79.6% in the wavelength range from 380 to 780 nm, and the spatial resolution is <5 mm for the full depth of field (4000 mm). The optical system also has a large relative aperture (1:2.4) and can be applied in high-speed camera diagnostics. As an important diagnostic tool, the optical system has been installed on the HT-7 (Hefei Tokamak-7) for its final experimental campaign, and the experiments confirmed that it can be applied to the investigation of transient processes in plasma, such as ELMy eruptions in H-mode, on EAST.

Yang, J. H.; Hu, L. Q.; Zang, Q.; Han, X. F.; Shao, C. Q.; Sun, T. F.; Chen, H.; Wang, T. F.; Li, F. J.; Hu, A. L. [Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031 (China)] [Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031 (China); Yang, X. F. [Jiangsu Province Key Laboratory of Modern Optical Technology, Soochow University, Suzhou, Jiangsu 215006 (China)] [Jiangsu Province Key Laboratory of Modern Optical Technology, Soochow University, Suzhou, Jiangsu 215006 (China)

2013-08-15T23:59:59.000Z

239

Vertical compact torus injection into the STOR-M Tokamak.  

E-Print Network [OSTI]

??Central fuelling is a fundamental issue in the neat generation tokamak – ITER (International Thermonuclear Experimental Reactor). It is essential for optimization of the bootstrap… (more)

Liu, Dazhi

2006-01-01T23:59:59.000Z

240

Etude du comportement du tungstène sous irradiation : applications aux réacteurs de fusion.  

E-Print Network [OSTI]

??La fusion thermonucléaire est envisagée comme nouvelle source énergétique pratiquement inépuisable. Le projet ITER " International Thermonuclear Experimental Reactor " doit démontrer la faisabilité scientifique… (more)

Sidibe, Moussa

2014-01-01T23:59:59.000Z

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While these samples are representative of the content of NLEBeta,
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241

US stays in global fusion deal — for a year  

Science Journals Connector (OSTI)

... intent last week that will allow the United States to continue work on the International Thermonuclear Experimental Reactor (ITER) design until next July. ...

Colin Macilwain

1998-10-01T23:59:59.000Z

242

Etude du comportement du tungstène sous irradiation : applications aux réacteurs de fusion.  

E-Print Network [OSTI]

??La fusion thermonucléaire est envisagée comme nouvelle source énergétique pratiquement inépuisable. Le projet ITER « International Thermonuclear Experimental Reactor » doit démontrer la faisabilité scientifique… (more)

Sidibe, Moussa

2014-01-01T23:59:59.000Z

243

E-Print Network 3.0 - aged reactor pressure Sample Search Results  

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

effort Summary: plan to build a 5 billion fusion reactor, called the International Thermonuclear Experimental Reactor... could be achieved in 35 years. "By the time our young...

244

E-Print Network 3.0 - advanced reactor study Sample Search Results  

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

Hotel bargains... to iron out their differences over the site of the International Thermonuclear Experimental Reactor Source: Fusiongnition Research Experiment (FIRE) Collection:...

245

E-Print Network 3.0 - advanced fusion reactors Sample Search...  

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

fusion plant deal 1 hour, 28 minutes ago Representatives of more... ) International Thermonuclear Experimental Reactor (ITER), which will be built at ... Source: Fusiongnition...

246

Timeline of Events: 1991 to 2000 | Department of Energy  

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

European Union, and Japan that will end U. S. participation in the International Thermonuclear Experimental Reactor (ITER) project by July 1999. October 19, 1998 The Department...

247

E-Print Network 3.0 - advanced reactor research Sample Search...  

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

to build the world's most advanced nuclear fusion reactor... ) International Thermonuclear Experimental Reactor (ITER), which will be built at Cadarache, near the...

248

E-Print Network 3.0 - advanced research reactor Sample Search...  

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

to build the world's most advanced nuclear fusion reactor... ) International Thermonuclear Experimental Reactor (ITER), which will be built at Cadarache, near the...

249

E-Print Network 3.0 - advanced marine reactor Sample Search Results  

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

to build the world's most advanced nuclear fusion reactor... ) International Thermonuclear Experimental Reactor (ITER), which will be built at Cadarache, near the...

250

Oak Ridge Centers for Manufacturing Technology - Partnership...  

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

lead for the heating, fueling and vacuum portions of the U.S.- ITER (International Thermonuclear Experimental Reactor). These testimonials cite the ORCMT as their launching pad...

251

E-Print Network 3.0 - australian moata reactor Sample Search...  

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

was expected on breaking... the deadlock over where to base the International Thermonuclear Experimental Reactor (ITER), the officials... for 20 years. The six parties failed...

252

Sandra Brereton  

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

analysis, and she contributed to the early stages of design of the International Thermonuclear Experimental Reactor (ITER). She received a Bachelor's degree in chemical...

253

--No Title--  

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

from national laboratories and universities. Leading the list was the International Thermonuclear Experimental Reactor, a facility capable of producing a "burning plasma" fusion...

254

E-Print Network 3.0 - almaty wwr-k reactor Sample Search Results  

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

High Flux Isotope Reactor Center for Nanophase Materials Sciences... International Thermonuclear Experimental Reactor Center for Computational Sciences National Security 0 0 61 1...

255

E-Print Network 3.0 - advanced fusion concepts Sample Search...  

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

10.3 Alternate Concepts Fusion Technology FY 1995 -- 372.6 12;... International Thermonuclear Experimental Reactor Plasma Technologies Fusion Technologies Advanced Materials......

256

--No Title--  

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

joined Martin Marietta Energy Systems as project coordinator for the International Thermonuclear Experimental Reactor (ITER) engineering design activities. He became the U.S. ITER...

257

E-Print Network 3.0 - austrian research reactor Sample Search...  

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

to build the world's most advanced nuclear fusion reactor... ) International Thermonuclear Experimental Reactor (ITER), which will be built at Cadarache, near the...

258

E-Print Network 3.0 - anuclear research reactor Sample Search...  

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

to build the world's most advanced nuclear fusion reactor... ) International Thermonuclear Experimental Reactor (ITER), which will be built at Cadarache, near the...

259

E-Print Network 3.0 - advanced hanaro reactor Sample Search Results  

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

to build the world's most advanced nuclear fusion reactor... ) International Thermonuclear Experimental Reactor (ITER), which will be built at Cadarache, near the...

260

E-Print Network 3.0 - armoured actively cooled Sample Search...  

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

on the actively cooled plasma facing components (PFCs) of the International Thermonuclear Experimental Reactor... of the actively cooled component itself. These have...

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


261

E-Print Network 3.0 - atomic reactors nouvelles Sample Search...  

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

to build the world's most advanced nuclear fusion reactor... ) International Thermonuclear Experimental Reactor (ITER), which will be built at Cadarache, ... Source:...

262

Our Mission  

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

Collider (LHC), Coupled Model Intercomparison Project (CMIP), and International Thermonuclear Experimental Reactor (ITER), generate and exchange massive amounts of data. ESnet...

263

Failure of a neutrino-driven explosion after core-collapse may lead to a thermonuclear supernova  

E-Print Network [OSTI]

We demonstrate that $\\sim10$ seconds after core-collapse of a massive star, a thermonuclear explosion of the outer shells is possible for some (tuned) initial density and composition profiles, assuming the neutrinos failed to explode the star. The explosion may lead to a successful supernova, as first suggested by Burbidge, Burbidge, Fowler and Hoyle (1957). We perform a series of one-dimensional (1D) calculations of collapsing massive stars with simplified initial density profiles (similar to the results of stellar evolution calculations) and various compositions (not similar to 1D stellar evolution calculations). We assume that the neutrinos escaped with negligible effect on the outer layers, which inevitably collapse. As the shells collapse, they compress and heat up adiabatically, enhancing the rate of thermonuclear burning. In some cases, where significant shells of mixed helium and oxygen are present with pre-collapsed burning times of $\\lesssim100\\,\\textrm{s}$ ($\\approx10$ times the free-fall time), a ...

Kushnir, Doron

2014-01-01T23:59:59.000Z

264

Total cross sections and thermonuclear reaction rates for C13(d,n) and C14(d,n)  

Science Journals Connector (OSTI)

The C13(d,n) and C14(d,n) cross sections have been measured for 0.2?Ec.m.?2.1 MeV and 0.2?Ec.m.?1.3 MeV, respectively, using a 4? neutron detector. The cross sections are used to calculate the thermonuclear reaction rates for temperatures below 10 GK. The implications of these and other new nuclear-physics results for inhomogeneous primordial nucleosynthesis are discussed.

C. R. Brune and R. W. Kavanagh

1992-03-01T23:59:59.000Z

265

NACRE II: an update of the NACRE compilation of charged-particle-induced thermonuclear reaction rates for nuclei with mass number $A < 16$  

E-Print Network [OSTI]

An update of the NACRE compilation [Angulo et al., Nucl. Phys. A 656 (1999) 3] is presented. This new compilation, referred to as NACRE II, reports thermonuclear reaction rates for 34 charged-particle induced, two-body exoergic reactions on nuclides with mass number $A<16$, of which fifteen are particle-transfer reactions and the rest radiative capture reactions. When compared with NACRE, NACRE II features in particular (1) the addition to the experimental data collected in NACRE of those reported later, preferentially in the major journals of the field by early 2013, and (2) the adoption of potential models as the primary tool for extrapolation to very low energies of astrophysical $S$-factors, with a systematic evaluation of uncertainties. As in NACRE, the rates are presented in tabular form for temperatures in the $10^{6}$ $\\simeq\\leq$ T $\\leq$ $10^{10}$ K range. Along with the 'adopted' rates, their low and high limits are provided. The new rates are available in electronic form as part of the Brussels Library (BRUSLIB) of nuclear data. The NACRE II rates also supersede the previous NACRE rates in the Nuclear Network Generator (NETGEN) for astrophysics. [http://www.astro.ulb.ac.be/databases.html.

Yi Xu; Kohji Takahashi; Stephane Goriely; Marcel Arnould; Masahisa Ohta; Hiroaki Utsunomiya

2013-10-26T23:59:59.000Z

266

On the Cooling Tails of Thermonuclear X-ray Bursts: The IGR J17480–2446 Link  

Science Journals Connector (OSTI)

The neutron star transient and 11 Hz X-ray pulsar IGR J17480–2446, recently discovered in the globular cluster Terzan 5, showed unprecedented bursting activity during its 2010 October-November outburst. We analyzed all X-ray bursts detected with the Rossi X-ray Timing Explorer and find strong evidence that they all have a thermonuclear origin, despite the fact that many do not show the canonical spectral softening along the decay imprinted on type I X-ray bursts by the cooling of the neutron star photosphere. We show that the persistent-to-burst power ratio is fully consistent with the accretion-to-thermonuclear efficiency ratio along the whole outburst, as is typical for type I X-ray bursts. The burst energy, peak luminosity, and daily-averaged spectral profiles all evolve smoothly throughout the outburst, in parallel with the persistent (non-burst) luminosity. We also find that the peak-burst to persistent luminosity ratio determines whether or not cooling is present in the bursts from IGR J17480–2446, and argue that the apparent lack of cooling is due to the "non-cooling" bursts having both a lower peak temperature and a higher non-burst (persistent) emission. We conclude that the detection of cooling along the decay is a sufficient, but not a necessary condition to identify an X-ray burst as thermonuclear. Finally, we compare these findings with X-ray bursts from other rapidly accreting neutron stars.

M. Linares; D. Chakrabarty; M. van der Klis

2011-01-01T23:59:59.000Z

267

Thermonuclear (Type I) X-Ray Bursts Observed by the Rossi X-Ray Timing Explorer  

Science Journals Connector (OSTI)

We have assembled a sample of 1187 thermonuclear (type I) X-ray bursts from observations of 48 accreting neutron stars by the Rossi X-ray Timing Explorer, spanning more than 10 years. The sample contains examples of two of the three theoretical ignition regimes (confirmed via comparisons with numerical models) and likely examples of the third. We present a detailed analysis of the variation of the burst profiles, energetics, recurrence times, presence of photospheric radius expansion, and presence of burst oscillations, as a function of accretion rate. We estimated the distance for 35 sources exhibiting radius-expansion bursts, and found that the peak flux of such bursts varies typically by 13%. We classified sources into two main groups based on the burst properties: (1) both long and short bursts (indicating mixed H/He accretion), and (2) consistently short bursts (primarily He accretion), and we calculated the mean burst rate as a function of accretion rate for the two groups. The decrease in burst rate observed at > 0.06Edd$0.06˙{M}Edd$ --> ( -->2 ? 1037 ergs s?1) is associated with a transition in the persistent spectral state and (as has been suggested previously) may be related to the increasing role of steady He burning. We found many examples of bursts with recurrence times

Duncan K. Galloway; Michael P. Muno; Jacob M. Hartman; Dimitrios Psaltis; Deepto Chakrabarty

2008-01-01T23:59:59.000Z

268

Evidence for enhanced persistent emission during sub-Eddington thermonuclear bursts  

E-Print Network [OSTI]

The standard approach for time-resolved X-ray spectral analysis of thermonuclear bursts involves subtraction of the pre-burst emission as background. This approach implicitly assumes that the persistent flux remains constant throughout the burst. We reanalyzed 332 photospheric radius expansion bursts observed from 40 sources by the Rossi X-ray Timing Explorer, introducing a multiplicative factor $f_a$ to the persistent emission contribution in our spectral fits. We found that for the majority of spectra the best-fit value of $f_a$ is significantly greater than 1, suggesting that the persistent emission typically increases during a burst. Elevated $f_a$ values were not found solely during the radius expansion interval of the burst, but were also measured in the cooling tail. The modified model results in a lower average value of the $\\chi^2$ fit statistic, indicating superior spectral fits, but not yet to the level of formal statistical consistency for all the spectra. We interpret the elevated $f_a$ values as...

Worpel, Hauke; Price, Daniel J

2015-01-01T23:59:59.000Z

269

Thermonuclear reaction rate of 18O(p,gamma)19F  

E-Print Network [OSTI]

For stars between 0.8-8.0 solar masses, nucleosynthesis enters its final phase during the asymptotic giant branch (AGB) stage. During this evolutionary period, grain condensation occurs in the stellar atmosphere, and the star experiences significant mass loss. The production of presolar grains can often be attributed to this unique stellar environment. A subset of presolar oxide grains features dramatic 18O depletion that cannot be explained by the standard AGB star burning stages and dredge-up models. An extra mixing process, referred to as "cool bottom processing" (CBP), was proposed for low-mass AGB stars. The 18O depletion observed within certain stellar environments and within presolar grain samples may result from the 18O+p processes during CBP. We report here on a study of the 18O(p,gamma)19F reaction at low energies. Based on our new results, we found that the resonance at Er = 95 keV (lab) has a negligible affect on the reaction rate at the temperatures associated with CBP. We also determined that the direct capture S-factor is almost a factor of 2 lower than the previously recommended value at low energies. An improved thermonuclear reaction rate for 18O(p,gamma)19F is presented.

M. Q. Buckner; C. Iliadis; J. M. Cesaratto; C. Howard; T. B. Clegg; A. E. Champagne; S. Daigle

2012-12-05T23:59:59.000Z

270

Screened thermonuclear reactions and predictive stellar evolution of detached double-lined eclipsing binaries  

E-Print Network [OSTI]

The low energy fusion cross sections of charged-particle nuclear reactions (and the respective reaction rates) in stellar plasmas are enhanced due to plasma screening effects. We study the impact of those effects on predictive stellar evolution simulations for detached double-lined eclipsing binaries. We follow the evolution of binary systems (pre-main sequence or main sequence stars) with precisely determined radii and masses from 1.1Mo to 23Mo (from their birth until their present state). The results indicate that all the discrepancies between the screened and unscreened models (in terms of luminosity, stellar radius, and effective temperature) are within the observational uncertainties. Moreover, no nucleosynthetic or compositional variation was found due to screening corrections. Therefore all thermonuclear screening effects on the charged-particle nuclear reactions that occur in the binary stars considered in this work (from their birth until their present state) can be totally disregarded. In other words, all relevant charged-particle nuclear reactions can be safely assumed to take place in a vacuum, thus simplifying and accelerating the simulation processes.

Theodore Liolios; Theocharis Kosmas

2005-07-06T23:59:59.000Z

271

Evidence of thermonuclear flame spreading on neutron stars from burst rise oscillations  

E-Print Network [OSTI]

Burst oscillations during the rising phases of thermonuclear X-ray bursts are usually believed to originate from flame spreading on the neutron star surface. However, the decrease of fractional oscillation amplitude with rise time, which provides a main observational support for the flame spreading model, have so far been reported from only a few bursts. Moreover, the non-detection and intermittent detections of rise oscillations from many bursts are not yet understood considering the flame spreading scenario. Here, we report the decreasing trend of fractional oscillation amplitude from an extensive analysis of a large sample of Rossi X-ray Timing Explorer Proportional Counter Array bursts from ten neutron star low-mass X-ray binaries. This trend is 99.99% significant for the best case, which provides, to the best of our knowledge, by far the strongest evidence of such trend. Moreover, it is important to note that an opposite trend is not found from any of the bursts. The concave shape of the fractional ampli...

Chakraborty, Manoneeta

2014-01-01T23:59:59.000Z

272

Rotational effects in thermonuclear Type I Bursts: equatorial crossing and directionality of flame spreading  

E-Print Network [OSTI]

In a previous study on thermonuclear (Type I) Bursts on accreting neutron stars we addressed and demonstrated the importance of the effects of rotation, through the Coriolis force, on the propagation of the burning flame. However, that study only analysed cases of longitudinal propagation, where the Coriolis force coefficient $2\\Omega\\cos\\theta$ was constant. In this paper, we study the effects of rotation on propagation in the meridional (latitudinal) direction, where the Coriolis force changes from its maximum at the poles to zero at the equator. We find that the zero Coriolis force at the equator, while affecting the structure of the flame, does not prevent its propagation from one hemisphere to another. We also observe structural differences between the flame propagating towards the equator and that propagating towards the pole, the second being faster. In the light of the recent discovery of the low spin frequency of burster IGR~J17480-2446 rotating at 11 Hz (for which Coriolis effects should be negligib...

Cavecchi, Yuri; Levin, Yuri; Braithwaite, Jonathan

2014-01-01T23:59:59.000Z

273

On the applicability of the level set method beyond the flamelet regime in thermonuclear supernova simulations  

E-Print Network [OSTI]

In thermonuclear supernovae, intermediate mass elements are mostly produced by distributed burning provided that a deflagration to detonation transition does not set in. Apart from the two-dimensional study by Roepke & Hillebrandt (2005), very little attention has been payed so far to the correct treatment of this burning regime in numerical simulations. In this article, the physics of distributed burning is reviewed from the literature on terrestrial combustion and differences which arise from the very small Prandtl numbers encountered in degenerate matter are pointed out. Then it is shown that the level set method continues to be applicable beyond the flamelet regime as long as the width of the flame brush does not become smaller than the numerical cutoff length. Implementing this constraint with a simple parameterisation of the effect of turbulence onto the energy generation rate, the production of intermediate mass elements increases substantially compared to previous simulations, in which the burning process was stopped once the mass density dropped below 10^7 g/cm^3. Although these results depend on the chosen numerical resolution, an improvement of the constraints on the the total mass of burning products in the pure deflagration scenario can be achieved.

W. Schmidt

2007-01-15T23:59:59.000Z

274

Sensitivity study of explosive nucleosynthesis in type Ia supernovae: Modification of individual thermonuclear reaction rates  

Science Journals Connector (OSTI)

Background: Type Ia supernovae contribute significantly to the nucleosynthesis of many Fe-group and intermediate-mass elements. However, the robustness of nucleosynthesis obtained via models of this class of explosions has not been studied in depth until now.Purpose: We explore the sensitivity of the nucleosynthesis resulting from thermonuclear explosions of massive white dwarfs with respect to uncertainties in nuclear reaction rates. We put particular emphasis on indentifying the individual reactions rates that most strongly affect the isotopic products of these supernovae.Method: We have adopted a standard one-dimensional delayed detonation model of the explosion of a Chandrasekhar-mass white dwarf and have postprocessed the thermodynamic trajectories of every mass shell with a nucleosynthetic code to obtain the chemical composition of the ejected matter. We have considered increases (decreases) by a factor of 10 on the rates of 1196 nuclear reactions (simultaneously with their inverse reactions), repeating the nucleosynthesis calculations after modification of each reaction rate pair. We have computed as well hydrodynamic models for different rates of the fusion reactions of 12C and of 16O. From the calculations we have selected the reactions that have the largest impact on the supernova yields, and we have computed again the nucleosynthesis using two or three alternative prescriptions for their rates, taken from the JINA REACLIB database. For the three reactions with the largest sensitivity we have analyzed as well the temperature ranges where a modification of their rates has the strongest effect on nucleosynthesis.Results: The nucleosynthesis resulting from the type Ia supernova models is quite robust with respect to variations of nuclear reaction rates, with the exception of the reaction of fusion of two 12C nuclei. The energy of the explosion changes by less than ?4% when the rates of the reactions 12C+12C or 16O+16O are multiplied by a factor of ×10 or ×0.1. The changes in the nucleosynthesis owing to the modification of the rates of these fusion reactions are also quite modest; for instance, no species with a mass fraction larger than 0.02 experiences a variation of its yield larger than a factor of 2. We provide the sensitivity of the yields of the most abundant species with respect to the rates of the most intense reactions with protons, neutrons, and ?. In general, the yields of Fe-group nuclei are more robust than the yields of intermediate-mass elements. Among the species with yields larger than 10?8M?, 35S has the largest sensitivity to the nuclear reaction rates. It is remarkable that the reactions involving elements with Z>22 have a tiny influence on the supernova nucleosynthesis. Among the charged-particle reactions, the most influential on supernova nucleosynthesis are 30Si+p?31P+?, 20Ne+??24Mg+?, and 24Mg+??27Al+p. The temperatures at which a modification of their rate has a larger impact are in the range 2?T?4 GK.Conclusions: The explosion model (i.e., the assumed conditions and propagation of the flame) chiefly determines the element production of type Ia supernovae and derived quantities such as their luminosity, while the nuclear reaction rates used in the simulations have a small influence on the kinetic energy and final chemical composition of the ejecta. Our results show that the uncertainty in individual thermonuclear reaction rates cannot account for discrepancies of a factor of 2 between isotopic ratios in type Ia supernovae and those in the solar system, especially within the Fe group.

Eduardo Bravo and Gabriel Martínez-Pinedo

2012-05-18T23:59:59.000Z

275

Charged-Particle Thermonuclear Reaction Rates: I. Monte Carlo Method and Statistical Distributions  

E-Print Network [OSTI]

A method based on Monte Carlo techniques is presented for evaluating thermonuclear reaction rates. We begin by reviewing commonly applied procedures and point out that reaction rates that have been reported up to now in the literature have no rigorous statistical meaning. Subsequently, we associate each nuclear physics quantity entering in the calculation of reaction rates with a specific probability density function, including Gaussian, lognormal and chi-squared distributions. Based on these probability density functions the total reaction rate is randomly sampled many times until the required statistical precision is achieved. This procedure results in a median (Monte Carlo) rate which agrees under certain conditions with the commonly reported recommended "classical" rate. In addition, we present at each temperature a low rate and a high rate, corresponding to the 0.16 and 0.84 quantiles of the cumulative reaction rate distribution. These quantities are in general different from the statistically meaningless "minimum" (or "lower limit") and "maximum" (or "upper limit") reaction rates which are commonly reported. Furthermore, we approximate the output reaction rate probability density function by a lognormal distribution and present, at each temperature, the lognormal parameters miu and sigma. The values of these quantities will be crucial for future Monte Carlo nucleosynthesis studies. Our new reaction rates, appropriate for bare nuclei in the laboratory, are tabulated in the second paper of this series (Paper II). The nuclear physics input used to derive our reaction rates is presented in the third paper of this series (Paper III). In the fourth paper of this series (Paper IV) we compare our new reaction rates to previous results.

Richard Longland; Christian Iliadis; Art Champagne; Joe Newton; Claudio Ugalde; Alain Coc; Ryan Fitzgerald

2010-04-23T23:59:59.000Z

276

Experimental and numerical analysis of transport phenomena in an internal indirect fuel reforming type Solid Oxide Fuel Cells using Ni/SDC as a catalyst  

Science Journals Connector (OSTI)

This paper presents experimental and numerical studies on the fuel reforming process on an Ni/SDC catalyst. To optimize the reforming reactors, detailed data about the entire reforming process is required. In the present paper kinetics of methane/steam reforming on the Ni/SDC catalyst was experimentally investigated. Measurements including different thermal boundary conditions, the fuel flow rate and the steam-to-methane ratios were performed. The reforming rate equation derived from experimental data was implemented in into numerical model which was numerically solved in order to discuss this process in details.

G Brus; S Kimijima; J S Szmyd

2012-01-01T23:59:59.000Z

277

THE FERMI-GBM X-RAY BURST MONITOR: THERMONUCLEAR BURSTS FROM 4U 0614+09  

SciTech Connect (OSTI)

Thermonuclear bursts from slowly accreting neutron stars (NSs) have proven difficult to detect, yet they are potential probes of the thermal properties of the NS interior. During the first year of a systematic all-sky search for X-ray bursts using the Gamma-ray Burst Monitor aboard the Fermi Gamma-ray Space Telescope we have detected 15 thermonuclear bursts from the NS low-mass X-ray binary 4U 0614+09 when it was accreting at nearly 1% of the Eddington limit. We measured an average burst recurrence time of 12 {+-} 3 days (68% confidence interval) between 2010 March and 2011 March, classified all bursts as normal duration bursts and placed a lower limit on the recurrence time of long/intermediate bursts of 62 days (95% confidence level). We discuss how observations of thermonuclear bursts in the hard X-ray band compare to pointed soft X-ray observations and quantify such bandpass effects on measurements of burst radiated energy and duration. We put our results for 4U 0614+09 in the context of other bursters and briefly discuss the constraints on ignition models. Interestingly, we find that the burst energies in 4U 0614+09 are on average between those of normal duration bursts and those measured in long/intermediate bursts. Such a continuous distribution in burst energy provides a new observational link between normal and long/intermediate bursts. We suggest that the apparent bimodal distribution that defined normal and long/intermediate duration bursts during the last decade could be due to an observational bias toward detecting only the longest and most energetic bursts from slowly accreting NSs.

Linares, M.; Chakrabarty, D. [Massachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research, Cambridge, MA 02139 (United States); Connaughton, V.; Bhat, P. N.; Briggs, M. S.; Preece, R. [CSPAR and Physics Department, University of Alabama in Huntsville, Huntsville, AL 35899 (United States); Jenke, P.; Kouveliotou, C.; Wilson-Hodge, C. A. [Space Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL 35812 (United States); Van der Horst, A. J. [Astronomical Institute 'Anton Pannekoek', University of Amsterdam, NL-1090-GE Amsterdam (Netherlands); Camero-Arranz, A.; Finger, M.; Paciesas, W. S. [Universities Space Research Association, Huntsville, AL 35805 (United States); Beklen, E. [Physics Department, Suleyman Demirel University, 32260 Isparta (Turkey); Von Kienlin, A. [Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, Postfach 1312, D-85748 Garching (Germany)

2012-12-01T23:59:59.000Z

278

Laser-Beam-Scattering Measurement of Ion Temperature in a ?-Pinch Plasma and Evidence for Thermonuclear Reactions  

Science Journals Connector (OSTI)

Results are reported on an experiment to measure the ion temperature in a 100-kJ ?-pinch deuterium plasma. A ruby laser was used for scattering observations at 5° and 90° using multichannel spectrum analyzers and gave n=1.05×1017 cm-3 and Ti=300 eV. An independent measurement of the density was made by means of Rayleigh scattering. The neutron yield from the plasma was measured to be 8×108 sec-1. The observed neutron emission was compared with that expected from a plasma with an ion temperature of 300 eV and was found to be of thermonuclear origin.

P. K. John

1972-08-01T23:59:59.000Z

279

Evidence for a new path to the self-sustainment of thermonuclear fusion in magnetically confined plasmas  

Science Journals Connector (OSTI)

In this work we provide the first explanation for observations made in 1997 on the Joint European Torus of unexpected ion heating with fusion-born alpha particles occurring over time scales much shorter than those theoretically foreseen. We demonstrate that non-thermal alpha particles above a critical concentration stabilize ion-drift-wave turbulence, therefore significantly reducing one of the main energy loss channels for thermal ions. As such ion heating occurs over times scales much shorter than those classically predicted, this mechanism opens new prospects on additional paths for the self-sustainment of thermonuclear fusion reactions in magnetically confined plasmas.

D. Testa; M. Albergante

2012-01-01T23:59:59.000Z

280

Preprint version 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems, Tokyo, Japan Experimental validation of a new adaptive control scheme for  

E-Print Network [OSTI]

is to control its 3D position and yaw angle, i.e., quantities know to be flat outputs for the system [17Preprint version 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems, Tokyo- hicles (MAVs) field. Among the numerous tasks attainable with MAV systems, one can list aerial mapping

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


281

The Effects of Variations in Nuclear Interactions on Nucleosynthesis in Thermonuclear Supernovae  

E-Print Network [OSTI]

The impact of nuclear physics uncertainties on nucleosynthesis in thermonuclear supernovae has not been fully explored using comprehensive and systematic studies with multiple models. To better constrain predictions of yields from these phenomena, we have performed a sensitivity study by post-processing thermodynamic histories from two different hydrodynamic, Chandrasekhar-mass explosion models. We have individually varied all input reaction and, for the first time, weak interaction rates by a factor of ten and compared the yields in each case to yields using standard rates. Of the 2305 nuclear reactions in our network, we find that the rates of only 53 reactions affect the yield of any species with an abundance of at least 10^-8 M_sun by at least a factor of two, in either model. The rates of the 12C(a,g), 12C+12C, 20Ne(a,p), 20Ne(a,g) and 30Si(p,g) reactions are among those that modify the most yields when varied by a factor of ten. From the individual variation of 658 weak interaction rates in our network by a factor of ten, only the stellar 28Si(b+)28Al, 32S(b+)32P and 36Ar(b+)36Cl rates significantly affect the yields of species in a model. Additional tests reveal that reaction rate changes over temperatures T > 1.5 GK have the greatest impact, and that ratios of radionuclides that may be used as explosion diagnostics change by a factor of less than two from the variation of individual rates by a factor of 10. Nucleosynthesis in the two adopted models is relatively robust to variations in individual nuclear reaction and weak interaction rates. Laboratory measurements of a limited number of reactions would help to further constrain predictions. As well, we confirm the need for a consistent treatment for relevant stellar weak interaction rates since simultaneous variation of these rates (as opposed to individual variation) has a significant effect on yields in our models.

Anuj Parikh; Jordi Jose; Ivo R. Seitenzahl; Friedrich K. Roepke

2013-06-25T23:59:59.000Z

282

On the Frequency Evolution of X-ray Brightness Oscillations During Thermonuclear X-ray Bursts: Evidence for Coherent Oscillations  

E-Print Network [OSTI]

We investigate the time dependence of the frequency of X-ray brightness oscillations during thermonuclear bursts from several neutron star low mass X-ray binaries. We find that the oscillation frequencies in the cooling tails of X-ray bursts from 4U 1702-429 and 4U 1728-34 are well described by an exponential "chirp" model. With this model we demonstrate that the pulse trains in the cooling tails of many bursts are highly phase coherent, having oscillation quality factors as high as Q ~ 4000. We use this model of the frequency evolution to search sensitively for significant power at the harmonics and first sub-harmonic of the 330 and 363 Hz signals in bursts from 4U 1702-429 and 4U 1728-34, respectively, but find not evidence for significant power at any harmonic or the sub-harmonic. We argue that the high coherence favors stellar rotation as the source of the oscillations. We briefly discuss the frequency evolution in terms of rotational motion of an angular momentum conserving thermonuclear shell. we discuss how the limits on harmonic content can be used to infer properties of the neutron star.

Tod E. Strohmayer; Craig B. Markwardt

1999-03-03T23:59:59.000Z

283

Concept of a thermonuclear reactor based on gravity retention of high-temperature plasma  

E-Print Network [OSTI]

In the present paper the realization of the obtained results in relation to the dense high- temperature plasma of multivalent ions including experimental data interpretation is discussed.

S. I. Fisenko; I. S. Fisenko

2007-05-27T23:59:59.000Z

284

Experimental results and numerical modeling of a high-performance large-scale cryopump. I. Test particle Monte Carlo simulation  

Science Journals Connector (OSTI)

For the torus of the nuclear fusion project ITER (originally the International Thermonuclear Experimental Reactor but also Latin: the way) eight high-performance large-scale customized cryopumps must be designed and manufactured to accommodate the very high pumping speeds and throughputs of the fusion exhaust gas needed to maintain the plasma under stable vacuum conditions and comply with other criteria which cannot be met by standard commercial vacuum pumps. Under an earlier research and development program a model pump of reduced scale based on active cryosorption on charcoal-coated panels at 4.5 K was manufactured and tested systematically. The present article focuses on the simulation of the true three-dimensional complex geometry of the model pump by the newly developed PROVAC3D Monte Carlo code. It is shown for gas throughputs of up to 1000 sccm (?1.69 Pa m3/s at T?=?0° C) in the free molecular regime that the numerical simulation results are in good agreement with the pumping speeds measured. Meanwhile the capture coefficient associated with the virtual region around the cryogenic panels and shields which holds for higher throughputs is calculated using this generic approach. This means that the test particle Monte Carlo simulations in free molecular flow can be used not only for the optimization of the pumping system but also for the supply of the input parameters necessary for the future direct simulation Monte Carlo in the full flow regime.

Xueli Luo; Christian Day; Horst Haas; Stylianos Varoutis

2011-01-01T23:59:59.000Z

285

Experimental results and numerical modeling of a high-performance large-scale cryopump. I. Test particle Monte Carlo simulation  

SciTech Connect (OSTI)

For the torus of the nuclear fusion project ITER (originally the International Thermonuclear Experimental Reactor, but also Latin: the way), eight high-performance large-scale customized cryopumps must be designed and manufactured to accommodate the very high pumping speeds and throughputs of the fusion exhaust gas needed to maintain the plasma under stable vacuum conditions and comply with other criteria which cannot be met by standard commercial vacuum pumps. Under an earlier research and development program, a model pump of reduced scale based on active cryosorption on charcoal-coated panels at 4.5 K was manufactured and tested systematically. The present article focuses on the simulation of the true three-dimensional complex geometry of the model pump by the newly developed ProVac3D Monte Carlo code. It is shown for gas throughputs of up to 1000 sccm ({approx}1.69 Pa m{sup 3}/s at T = 0 deg. C) in the free molecular regime that the numerical simulation results are in good agreement with the pumping speeds measured. Meanwhile, the capture coefficient associated with the virtual region around the cryogenic panels and shields which holds for higher throughputs is calculated using this generic approach. This means that the test particle Monte Carlo simulations in free molecular flow can be used not only for the optimization of the pumping system but also for the supply of the input parameters necessary for the future direct simulation Monte Carlo in the full flow regime.

Luo Xueli; Day, Christian; Haas, Horst; Varoutis, Stylianos [Karlsruhe Institute of Technology, Institute for Technical Physics, 76021 Karlsruhe (Germany)

2011-07-15T23:59:59.000Z

286

On the Effect of Explosive Thermonuclear Burning on the Accreted Envelopes of White Dwarfs in Cataclysmic Variables  

Science Journals Connector (OSTI)

The detection of heavy elements at suprasolar abundances in the atmospheres of some accreting white dwarfs in cataclysmic variables (CVs), coupled with the high temperatures needed to produce these elements, requires explosive thermonuclear burning. The central temperatures of any formerly more massive secondary stars in CVs undergoing hydrostatic CNO burning are far too low to produce these elements. Evidence is presented that at least some CVs contain donor secondaries that have been contaminated by white dwarf remnant burning during the common envelope phase and are transferring this material back to the white dwarf. This scenario does not exclude the channel in which formerly more massive donor stars underwent CNO processing in systems with thermal timescale mass transfer. Implications for the progenitors of CVs are discussed and a new scenario for the white dwarf's accretion-nova-outburst is given.

Edward M. Sion; Warren Sparks

2014-01-01T23:59:59.000Z

287

On the Effect of Explosive Thermonuclear Burning on the Accreted Envelopes of White Dwarfs in Cataclysmic Variables  

E-Print Network [OSTI]

The detection of heavy elements at suprasolar abundances in the atmospheres of some accreting white dwarfs in cataclysmic variables, coupled with the high temperatures needed to produce these elements requires explosive thermonuclear burning. The central temperatures of any formerly more massive secondary stars in CVs undergoing hydrostatic CNO burning are far too low to produce these elements. Evidence is presented that at least some cataclysmic variables contain donor secondaries that have been contaminated by repeated novae ejecta and are transferring this material back to the white dwarf. This scenario does not exclude the channel in which formerly more massive donor stars underwent CNO processing in ystems that underwent thermal timescale mass transfer. Implications for the progenitors of CVs are discussed.

Sion, Edward M

2014-01-01T23:59:59.000Z

288

E-Print Network 3.0 - annual international workshop Sample Search...  

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

(Zrich). Workshops: WZB... -682. 2003 Entry and Experimentation in Oligopolistic Markets for Experience Goods, International Journal... Behavior, International Economic...

289

Model based multivariable controller for large scale compression stations. Design and experimental validation on the LHC 18KW cryorefrigerator  

SciTech Connect (OSTI)

In this paper, a multivariable model-based non-linear controller for Warm Compression Stations (WCS) is proposed. The strategy is to replace all the PID loops controlling the WCS with an optimally designed model-based multivariable loop. This new strategy leads to high stability and fast disturbance rejection such as those induced by a turbine or a compressor stop, a key-aspect in the case of large scale cryogenic refrigeration. The proposed control scheme can be used to have precise control of every pressure in normal operation or to stabilize and control the cryoplant under high variation of thermal loads (such as a pulsed heat load expected to take place in future fusion reactors such as those expected in the cryogenic cooling systems of the International Thermonuclear Experimental Reactor ITER or the Japan Torus-60 Super Advanced fusion experiment JT-60SA). The paper details how to set the WCS model up to synthesize the Linear Quadratic Optimal feedback gain and how to use it. After preliminary tuning at CEA-Grenoble on the 400W@1.8K helium test facility, the controller has been implemented on a Schneider PLC and fully tested first on the CERN's real-time simulator. Then, it was experimentally validated on a real CERN cryoplant. The efficiency of the solution is experimentally assessed using a reasonable operating scenario of start and stop of compressors and cryogenic turbines. This work is partially supported through the European Fusion Development Agreement (EFDA) Goal Oriented Training Program, task agreement WP10-GOT-GIRO.

Bonne, François; Bonnay, Patrick [INAC, SBT, UMR-E 9004 CEA/UJF-Grenoble, 17 rue des Martyrs, 38054 Grenoble (France); Alamir, Mazen [Gipsa-Lab, Control Systems Department, CNRS-University of Grenoble, 11, rue des Mathématiques, BP 46, 38402 Saint Martin d'Hères (France); Bradu, Benjamin [CERN, CH-1211 Genève 23 (Switzerland)

2014-01-29T23:59:59.000Z

290

The thermonuclear rate for the 19F(a,p)22Ne reaction at stellar temperatures  

E-Print Network [OSTI]

The $^{19}$F($\\alpha$,p)$^{22}$Ne reaction is considered to be one of the main sources of fluorine depletion in AGB and Wolf-Rayet stars. The reaction rate still retains large uncertainties due to the lack of experimental studies available. In this work the yields for both exit channels to the ground state and first excited state of $^{22}$Ne have been measured and several previously unobserved resonances have been found in the energy range E$_{lab}$=792-1993 keV. The level parameters have been determined through a detailed R-matrix analysis of the reaction data and a new reaction rate is provided on the basis of the available experimental information.

Claudio Ugalde; Richard Azuma; Aaron Couture; Joachim Görres; Hye-Young Lee; Edward Stech; Elizabeth Strandberg; Wanpeng Tan; Michael Wiescher

2008-03-04T23:59:59.000Z

291

The longest thermonuclear X-ray burst ever observed? (A BeppoSAX Wide Field Camera observation of 4U 1735-44)  

E-Print Network [OSTI]

A long flux enhancement, with an exponential decay time of 86 min, is detected in 4U 1735-44 with the BeppoSAX Wide Field Cameras. We argue that this is a type-I X-ray burst, making it the longest such burst ever observed. Current theories for thermonuclear bursts predict shorter and more frequent bursts for the observed persistent accretion rate.

R. Cornelisse; J. Heise; E. Kuulkers; F. Verbunt; J. J. M. in 't Zand

2000-03-30T23:59:59.000Z

292

Systematic variation in the apparent burning area of thermonuclear bursts and its implication for neutron star radius measurement  

E-Print Network [OSTI]

Precision measurements of neutron star radii can provide a powerful probe of the properties of cold matter beyond nuclear density. Beginning in the late 1970s it was proposed that the radius could be obtained from the apparent or inferred emitting area during the decay portions of thermonuclear (type I) X-ray bursts. However, this apparent area is generally not constant, preventing reliable measurement of the source radius. Here we report for the first time a correlation between the variation of the inferred area and the burst properties, measured in a sample of almost 900 bursts from 43 sources. We found that the rate of change of the inferred area during decay is anticorrelated with the burst decay duration. A Spearman rank correlation test shows that this relation is significant at the <10^{-45} level for our entire sample, and at the 7x10^{-37} level for the 625 bursts without photospheric radius expansion. This anticorrelation is also highly significant for individual sources exhibiting a wide range of burst durations, such as 4U 1636-536 and Aql X-1. We suggest that variations in the colour factor, which relates the colour temperature resulted from the scattering in the neutron star atmosphere to the effective temperature of the burning layer, may explain the correlation. This in turn implies significant variations in the composition of the atmosphere between bursts with long and short durations.

Sudip Bhattacharyya; M. Coleman Miller; Duncan K. Galloway

2009-08-28T23:59:59.000Z

293

The Long Term Stability of Oscillations During Thermonuclear X-ray Bursts: Constraining the Binary X-ray Mass Function  

E-Print Network [OSTI]

We report on the long term stability of the millisecond oscillations observed with the Rossi X-ray Timing Explorer (RXTE) during thermonuclear X-ray bursts from the low mass X-ray binaries (LMXB) 4U 1728-34 and 4U 1636-53. We show that bursts from 4U 1728-34 spanning more than 1.5 years have observed asymptotic oscillation periods which are within 0.2 microsec. of each other, well within the magnitude which could be produced by the orbital motion of the neutron star in a typical LMXB. This stability implies a timescale to change the oscillation period of > 23,000 years, suggesting a highly stable process such as stellar rotation as the oscillation mechanism. We show that period offsets in three distinct bursts from 4U 1636-53 can be plausibly interpreted as due to orbital motion of the neutron star in this 3.8 hour binary system. We discuss the constraints on the mass function which can in principle be derived using this technique.

Tod E. Strohmayer; William Zhang; Jean H. Swank; Iosif Lapidus

1998-06-18T23:59:59.000Z

294

Charged-Particle Thermonuclear Reaction Rates: II. Tables and Graphs of Reaction Rates and Probability Density Functions  

E-Print Network [OSTI]

Numerical values of charged-particle thermonuclear reaction rates for nuclei in the A=14 to 40 region are tabulated. The results are obtained using a method, based on Monte Carlo techniques, that has been described in the preceding paper of this series (Paper I). We present a low rate, median rate and high rate which correspond to the 0.16, 0.50 and 0.84 quantiles, respectively, of the cumulative reaction rate distribution. The meaning of these quantities is in general different from the commonly reported, but statistically meaningless expressions, "lower limit", "nominal value" and "upper limit" of the total reaction rate. In addition, we approximate the Monte Carlo probability density function of the total reaction rate by a lognormal distribution and tabulate the lognormal parameters {\\mu} and {\\sigma} at each temperature. We also provide a quantitative measure (Anderson-Darling test statistic) for the reliability of the lognormal approximation. The user can implement the approximate lognormal reaction rate probability density functions directly in a stellar model code for studies of stellar energy generation and nucleosynthesis. For each reaction, the Monte Carlo reaction rate probability density functions, together with their lognormal approximations, are displayed graphically for selected temperatures in order to provide a visual impression. Our new reaction rates are appropriate for bare nuclei in the laboratory. The nuclear physics input used to derive our reaction rates is presented in the subsequent paper of this series (Paper III). In the fourth paper of this series (Paper IV) we compare our new reaction rates to previous results.

Christian Iliadis; Richard Longland; Art Champagne; Alain Coc; Ryan Fitzgerald

2010-04-23T23:59:59.000Z

295

Investigation of thermonuclear $^{18}$Ne($?$,$p$)$^{21}$Na rate via resonant elastic scattering of $^{21}$Na+$p$  

E-Print Network [OSTI]

The $^{18}$Ne($\\alpha$,$p$)$^{21}$Na reaction is thought to be one of the key breakout reactions from the hot CNO cycles to the rp-process in type I x-ray bursts. In this work, the resonant properties of the compound nucleus $^{22}$Mg have been investigated by measuring the resonant elastic scattering of $^{21}$Na+$p$. An 89 MeV $^{21}$Na radioactive beam delivered from the CNS Radioactive Ion Beam Separator bombarded an 8.8 mg/cm$^2$ thick polyethylene (CH$_{2}$)$_{n}$ target. The $^{21}$Na beam intensity was about 2$\\times$10$^{5}$ pps, with a purity of about 70% on target. The recoiled protons were measured at the center-of-mass scattering angles of $\\theta_{c.m.}$$\\approx$175.2${^\\circ}$, 152.2${^\\circ}$, and 150.5${^\\circ}$ by three sets of $\\Delta E$-$E$ telescopes, respectively. The excitation function was obtained with the thick-target method over energies $E_x$($^{22}$Mg)=5.5--9.2 MeV. In total, 23 states above the proton-threshold in $^{22}$Mg were observed, and their resonant parameters were determined via an $R$-matrix analysis of the excitation functions. We have made several new $J^{\\pi}$ assignments and confirmed some tentative assignments made in previous work. The thermonuclear $^{18}$Ne($\\alpha$,$p$)$^{21}$Na rate has been recalculated based on our recommended spin-parity assignments. The astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the $^{18}$Ne($\\alpha$,$p$)$^{21}$Na rate significantly affects the peak nuclear energy generation rate, reaction fluxes, as well as the onset temperature of this breakout reaction in these astrophysical phenomena.

L. Y. Zhang; J. J. He; A. Parikh; S. W. Xu; H. Yamaguchi; D. Kahl; S. Kubono; P. Mohr; J. Hu; P. Ma; S. Z. Chen; Y. Wakabayashi; H. W. Wang; W. D. Tian; R. F. Chen; B. Guo; T. Hashimoto; Y. Togano; S. Hayakawa; T. Teranishi; N. Iwasa; T. Yamada; T. Komatsubara; Y. H. Zhang; X. H. Zhou

2014-03-19T23:59:59.000Z

296

Internal Tides  

Science Journals Connector (OSTI)

Abstract Internal tides are internal waves at tidal frequencies and are generated by interaction of the barotropic surface tide with bottom topography. Being dependent on ocean stratification and background currents, internal tides tend to be highly variable in time, sometimes almost erratic, yet in the open ocean the lowest mode can travel great distances across ocean basins while remaining phase-locked with the astronomical potential. Internal tides are an important energy source for ocean mixing.

R.D. Ray

2013-01-01T23:59:59.000Z

297

international programs  

National Nuclear Security Administration (NNSA)

9%2A en International Programs http:nnsa.energy.govaboutusourprogramsemergencyoperationscounterterrorisminternationalprograms

298

Method and system to directly produce electrical power within the lithium blanket region of a magnetically confined, deuterium-tritium (DT) fueled, thermonuclear fusion reactor  

DOE Patents [OSTI]

A method for integrating liquid metal magnetohydrodynamic power generation with fusion blanket technology to produce electrical power from a thermonuclear fusion reactor located within a confining magnetic field and within a toroidal structure. A hot liquid metal flows from a liquid metal blanket region into a pump duct of an electromagnetic pump which moves the liquid metal to a mixer where a gas of predetermined pressure is mixed with the pressurized liquid metal to form a Froth mixture. Electrical power is generated by flowing the Froth mixture between electrodes in a generator duct. When the Froth mixture exits the generator the gas is separated from the liquid metal and both are recycled.

Woolley, Robert D. (Belle Mead, NJ)

1999-01-01T23:59:59.000Z

299

Ion beam fusion  

Science Journals Connector (OSTI)

...that converts the fusion and blanket energy into...target gain G is the thermonuclear energy produced by the...Most concep- tual fusion power plants have a...and the International Thermonuclear Experimental Reactor...situation, the inertial fusion com- munity in the...

1999-01-01T23:59:59.000Z

300

Theoretical and experimental study of space charge in intense ion beams  

Science Journals Connector (OSTI)

The highly collimated beams of energetic neutral atoms used in controlled thermonuclear fusion research (CTR) require the virtual elimination of space-charge forces in the primary ion beam in order to minimize the angular divergence. A model is presented which describes the behavior of an intense ion beam passing through a gas cell. This theory is used to derive the space-charge field produced by such a beam and shows how its effect can be minimized. This model agrees well with experimental measurements and enables emittance-dominated beams of very high brightness to be obtained which could find applications in fields other than CTR.

A. J. T. Holmes

1979-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


301

Experimental Psychology  

Science Journals Connector (OSTI)

... of the British Medical Bulletin, an 80-page issue has been published concentrating on experimental psychology*. This is introduced and edited by Prof. Summerfield and contains fifteen short, but ... the question of just whom the work is intended for. Medical people unacquainted with experimental psychology will find the going very hard; because of the limited space available to each ...

H. J. EYSENCK

1964-04-18T23:59:59.000Z

302

Experimental Psychology  

Science Journals Connector (OSTI)

... French publishers, Presses Universitaires de France, have produced a nine-volume work on experimental psychology, broadly conceived, under the joint editorship of Professors Fraisse and Piaget. Volume 1, ... Professors Fraisse and Piaget. Volume 1, concerned with the history and method of experimental psychology, first appeared in 1963 in French. It consists of the following four chapters: ...

W. SLUCKIN

1968-06-15T23:59:59.000Z

303

Experimental Psychology  

Science Journals Connector (OSTI)

... Expérimental is the first JL treatise of its kind since the Harvard Handbook of Experimental Psychology, edited by S. S. Stevens and published in 1951. In a way, ... come from France, for although there has been a distinguished French psychological tradition, experimental psychology has never held a central place in it. Nor has the output of the ...

O. L. ZANGWILL

1964-07-11T23:59:59.000Z

304

On Thermonuclear Reaction Rates  

E-Print Network [OSTI]

Nuclear reactions govern major aspects of the chemical evolution od galaxies and stars. Analytic study of the reaction rates and reaction probability integrals is attempted here. Exact expressions for the reaction rates and reaction probability integrals for nuclear reactions in the case of nonresonant, modified nonresonant, screened nonresonant and resonant cases are given. These are expressed in terms of H-functions, G-functions and in computable series forms. Computational aspects are also discussed.

H. J. Haubold; A. M. Mathai

1996-12-02T23:59:59.000Z

305

INTERNAL REPAIR OF PIPELINES  

SciTech Connect (OSTI)

The two broad categories of deposited weld metal repair and fiber-reinforced composite repair technologies were reviewed for potential application for internal repair of gas transmission pipelines. Both are used to some extent for other applications and could be further developed for internal, local, structural repair of gas transmission pipelines. Preliminary test programs were developed for both deposited weld metal repairs and for fiber-reinforced composite repair. To date, all of the experimental work pertaining to the evaluation of potential repair methods has focused on fiber-reinforced composite repairs. Hydrostatic testing was also conducted on four pipeline sections with simulated corrosion damage: two with composite liners and two without.

Robin Gordon; Bill Bruce; Nancy Porter; Mike Sullivan; Chris Neary

2003-05-01T23:59:59.000Z

306

An Improved Reaction Rate Formulation for Charged-Particle Induced Thermonuclear Reaction of {sup 2}H(d,{gamma}){sup 4}He  

SciTech Connect (OSTI)

The reaction rate formula utilized in compilations such as the Nuclear Astrophysics Compilation of Reaction Rates (NACRE) uses low energy approximation due to temperatures in stars are in the region of a few keVs. Most nuclear reaction experiments were done in MeV range and the interior temperatures of massive stars are {approx}10{sup 9} K. Hence an improved formulation for calculating the nuclear reaction rate that is applicable to high temperatures is discussed in this work. The exact tunneling probability that is applicable for all energies is obtained by solving the Schroedinger equation. This yields an enhanced expression for the astrophysical S-factor for calculating the thermonuclear reaction rate at high temperature. The thermonuclear reaction rate from this work is applied to the {sup 2}H(d,{gamma}){sup 4}He reaction and is compared with the NACRE compilation. This improved reaction rate can be included in the nuclear reaction network in a Big Bang nucleosynthesis (BBN) code or a stellar nuclear network code.

Aziz, Azni Abdul; Yusof, Norhasliza; Idris, Mahirah; Kassim, Hasan Abu [Department of Physics, University of Malaya, 50603 Kuala Lumpur (Malaysia)

2011-03-30T23:59:59.000Z

307

The development of structural materials for fusion reactors  

Science Journals Connector (OSTI)

...severely exposed parts of future fusion reactors and pose key problems...successful implementation of fusion reactors as an efficient source...conditions in the International Thermonuclear Experimental Reactor (ITER...environmental attractiveness of fusion reactors. In this paper...

1999-01-01T23:59:59.000Z

308

Development of an experiment to study the effects of transverse stress on the critical current of a niobium-tin superconducting cable  

E-Print Network [OSTI]

Superconducting magnets will play a central role for the success of the International Thermonuclear Experimental Reactor (ITER). ITER is a current driven plasma experiment that could set a milestone towards the demonstration ...

Chiesa, Luisa

2006-01-01T23:59:59.000Z

309

Panel Report to FESAC: Review of the 1996 ITER Detailed Design Report  

Science Journals Connector (OSTI)

This report presents the results of a U.S. review of the 1996 Detailed Design Report (DDR) of the International Thermonuclear Experimental Reactor (ITER) project. It was prepared by a panel established by the ...

R. W. Conn; D. E. Baldwin; R. J. Briggs; J. D. Callen…

1999-12-01T23:59:59.000Z

310

Plasma-Sprayed Beryllium on Macro-Roughened Substrates for Fusion Reactor High Heat Flux Applications  

Science Journals Connector (OSTI)

The development of beryllium first wall (FW) plasma facing components for future magnetic confinement fusion experiments, such as the International Thermonuclear Experimental Reactor (ITER), is a topic of great.....

Kendall J. Hollis; Brian D. Bartram; Manfred Roedig…

2007-03-01T23:59:59.000Z

311

International telecommunications  

Science Journals Connector (OSTI)

... A NEW Japanese telecommunications company established by Cable and Wireless of the United Kingdom began international services last week ... company an operating licence (see Nature 326, 319; 1987). The costs of international telecommunications in Japan are expected to drop significantly as a result of the new competition. ...

David Swinbanks

1989-05-11T23:59:59.000Z

312

ENGINEERING INTERNATIONAL  

E-Print Network [OSTI]

Sydney is Australia's largest city and its centre of finance and commerce. The Harbour Bridge, Opera House and Sydney Tower are internationally recognised icons, which represent both Sydney and its rich developed close links with many international institutions, particularly in Asia. ENGINEERING IN SYDNEY

University of Technology, Sydney

313

Internal Communication  

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

9 Internal Communication Process 11_0303 Page 1 of 6 9 Internal Communication Process 11_0303 Page 1 of 6 EOTA - Business Process Document Title: Internal Communication Process Document Number: P-009 Rev 11_0303 Document Owner: Elizabeth Sousa Backup Owner: Melissa Otero Approver(s): Melissa Otero Parent Document: Q-001 Quality Manual Notify of Changes: EOTA Employees Referenced Document(s): N/A P-009 Internal Communication Process 11_0303 Page 2 of 6 Revision History: Rev. Description of Change A Initial Release 09_0902 Modified process to better fit current practice. 10_0831 Added verbiage to clarify process. Added initiation phrase to process steps. 11_0303 Added QAM to the last step and made minor editorial updates. P-009 Internal Communication Process 11_0303 Page 3 of 6 I. Purpose

314

Stress Management as an Enabling Technology for High-Field Superconducting Dipole Magnets  

E-Print Network [OSTI]

-Pounds HD High field Dipole HGQ High Gradient Quadrupole HQ High field Quadrupole HT Heat Treatment IC Critical Current IFCC Inter-Filament Coupling Currents ITER International Thermonuclear Experimental Reactor vi LARP LHC Accelerator... pressure impregnation (VPI) vessel using NbTi conductor [1, 2]. TAMU2 verified the heat treatment equipment and tested the stress management technology at low field using low Jc Nb3Sn conductor from the International Thermonuclear Experimental Reactor...

Holik, Eddie Frank

2014-06-03T23:59:59.000Z

315

Experimental Conclusions  

E-Print Network [OSTI]

temperature and high pressure pyrolysis of biomass performed at industrially relevant heating rates. (2-Pressure Biomass Pyrolysis in an Entrained-Flow Reactor 1Gautami Newalkar, 2Kristiina Iisa, 1Carsten Sievers and 1) Objective Results Experimental Conclusions 1000°C 600°C 4s 30s A major advantage of Biomass

Das, Suman

316

International Portfolio  

Broader source: Energy.gov [DOE]

The U.S.-China Clean Energy Research Center (CERC) is a multi-year international effort focused on developing and implementing energy efficiency technologies in both the USA and in China. The...

317

MU INTERNATIONAL DIRECTORY International Directory  

E-Print Network [OSTI]

of Ag., Food & Natural Resources International Programs http://students.missouri.edu/~asa Association of Malaysian Students http://www.missouri.edu/~ctl2m5/index.html Bangladesh Student Association

Taylor, Jerry

318

Direct-Drive Inerital Confinement Fusion Research at the Laboratory for Laser Energetics: Charting the Path to Thermonuclear Ignition  

SciTech Connect (OSTI)

Significant theoretical and experimental progress continues to be made at the University of Rocheter's Laboratory for Laser Energetics (LLE), charting the path to direct-drive inertial confinement fusion (ICF) ignition. Direct drive offers the potential for higher-gain implosions than x-ray drive and is a leading candidate for an inertial fusion enery power plant.

McCrory, R.L.; Regan, S.P.; Loucks, S.J.; Meyerhofer, D.D.; Skupsky, S.; Betti, R.; Boehly, T.R.; Craxton, R.S.; Collins, T.J.B.; Delettrez, J.A.; Edgell, D.; Epstein, R.; Fletcher, K.A.; Freeman, C.; Frenje, J.A.; Glebov, V.Yu.; Goncharov, V.N.; Harding, D.R.; Igumenshchev, I.V.; Keck, R.L.; Kilkenny, J.D.; Knauer, J.P.; Li, C.K.; Marciante, J.; Marozas, J.A.; Marshall, F.J.; Maximov, A.V.; McKenty, P.W.; Myatt, J.; Padalino, S.; Petrasso, R.D.; Radha, P.B.; Sangster, T.C.; Seguin, F.H.; Seka, W.; Smalyuk, V.A.; Soures, J.M.; Stoeckl, C.; Yaakobi, B.; Zuegel, J.D.

2005-10-07T23:59:59.000Z

319

The ITER budget is projected to be  

E-Print Network [OSTI]

's executive arm warned Tuesday that Europe would go ahead and build the International Thermonuclear | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Google It: Foreign Minister Michel Barnier Counterpart Mobutaka Machimura International Thermonuclear

320

Internal Dosimetry  

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

MEASUREMENT MEASUREMENT SENSITIVE DOE-STD-1121-2008 Change Notice No.1 October 2013 DOE STANDARD INTERNAL DOSIMETRY U.S. Department of Energy AREA SAFT Washington, D.C. 20585 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. This document is available on the Department of Energy Technical Standards Program Web Site at http://energy.gov/hss/information-center/department-energy- technical-standards-program ii Change Notice 1. Internal Dosimetry DOE-STD-1121-2008 Page/Section Change Throughout Change: airborne contamination To: airborne radioactivity Section 1.5, p. 4 Change: HPS N 13.1-1999 To: HPS N 13.1-2011 Section 1.5, p. 4 Change: HPS N 13.6-1999 To: HPS N 13,.6-2010 Section 1.5, p. 4 Delete: HPS N 13.14-1994, Internal Dosimetry Programs for

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


321

Late-time supernova light curves: the effect of internal conversion and Auger electrons  

Science Journals Connector (OSTI)

......of both core collapse and thermonuclear supernovae. We point out...the light curves of both thermonuclear (Type Ia) and, at least...expansion so that nuclear fusion ceases and radioactive decay...1 SNe Ia To date, the thermonuclear SNe with data coverage beyond......

I. R. Seitenzahl; S. Taubenberger; S. A. Sim

2009-11-21T23:59:59.000Z

322

Coal fuel slurry for internal combustion engines  

Science Journals Connector (OSTI)

A technoeconomic study of the production of coal-water fuel slurry for internal combustion engines and thermal power plants was performed. Based on the accumulated experimental data, it was found that, in the ...

N. I. Red’kina; G. S. Khodakov; E. G. Gorlov

2013-09-01T23:59:59.000Z

323

INTERNATIONAL COURSEGUIDE  

E-Print Network [OSTI]

, Applied Science, Arts and Design, Information Sciences and Engineering. INTERNATIONAL COURSE GUIDE01 #00212K, University of Canberra College #01893E. Information in this guide was correct at time in a competitive global market. This can involve work integrated learning, and in many courses students have

Canberra, University of

324

International Educational  

E-Print Network [OSTI]

International Journal of Educational Technology Opportunities and options for Web-enabled databases.D., Arizona State University The landscape of Web-based instruction is changing due to the convergence of the Web and database servers. Web-based database (WBD) servers enhance Web-based instruction by providing

Yu, Alex

325

INTERNATIONAL STUDYCENTRE  

E-Print Network [OSTI]

;6 Experiential Learning 8 21st Century Education 9 Supporting your Success 18 Financing your Castle Education is located in a 15th century castle, but our focus is the 21st century, an age of networks and processes escaping the Nazis, Dr. Alfred Bader fled to England in 1938, from where he was sent to an internment camp

Abolmaesumi, Purang

326

INTERNATIONAL STUDYCENTRE  

E-Print Network [OSTI]

;6 Experiential Learning 8 21st Century Education 9 Supporting your Success 18 Financing your Castle Education in a 15th century castle, but our focus is the 21st, a century of networks and processes.Where people escaping the Nazis, Dr. Alfred Bader fled to England in 1938, from where he was sent to an internment camp

Graham, Nick

327

Determination of astrophysical thermonuclear rates with a bubble chamber: The {sup 12}C(??){sup 16}O reaction case  

SciTech Connect (OSTI)

The {sup 12}C(??){sup 16}O reaction rate is considered one of the most important unknown parameters in the physics of structure and evolution of massive stars. While extensive experimental campaigns have been performed trying to improve the quality of the measurements, the rate still holds very large uncertainties. Here we discuss a new experimantal scheme to measure the cross section of this reaction with a bubble chamber and a bremsstrahlung beam. The main advantage of the technique is a gain in the luminosity of several orders of magnitude when compared to other ongoing experiments.

DiGiovine, B.; Henderson, D.; Holt, R. J.; Rehm, K. E. [Argonne National Laboratory, Argonne IL 60439 (United States); Grames, J.; Meekins, D.; Poelker, M.; Suleiman, R. [Jefferson Lab, Newport News, VA 23606 (United States); Robinson, A.; Ugalde, C., E-mail: cugalde@uchicago.edu [University of Chicago, Chicago, IL 60637 (United States); Sonnenschein, A. [Fermilab, Batavia, IL 60510 (United States)

2013-11-07T23:59:59.000Z

328

INTERNATIONAL AGREEMENTS  

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

INTERNATIONAL INTERNATIONAL AGREEMENTS Signed by Secretary Spencer Abraham January 2001-December 2004 TABLE OF CONTENTS Joint Statement of ntent between the Department of Energy of the United States ofAmerica and The Ministry of Energy and Mines of the Republic ofPeru on Cooperation in the Field of Energy -Tab 1 Fifth Hemispheric Energy Ministers Meeting Mexico City, Mexico - March 9, 2001. Mexico Declaration - Energy: A Crucial Factor for Integration and Sustainable Development in the Hemisphere - Tab 2 Extension of the Agreement for Energy Cooperation between the Department of Energy of the United States ofAmerica and the Secretariat ofEnergy of the United Mexican States, and its Four Annexes - Tab3 Implementing Agreement between the Department ofEnergy of the United States ofAmerica and the

329

Reaction Na23(?,p)Mg26 from E?=2.3-3.7 MeV and the corresponding thermonuclear reaction rate  

Science Journals Connector (OSTI)

Integrated excitation functions for the reactions Na23(?,p0)Mg26 and Na23(?,p1)Mg*26 were measured over the energy range E?=2.3-3.7 MeV. Absolute resonance strengths were determined for 30 new p1 resonances and 9 new p0 resonances. The corresponding stellar reaction rate NA is recalculated and found to be enhanced by a factor of 3 at T9=2 and by a factor of 4 at T9=3. A multiparameter analytic fit to the new NA as a function of temperature over the range T9=0.3-5.0 is given. The enhanced rate was incorporated in a nucleosynthesis code and the resulting change in Na23 and Mg26 abundances at selected temperatures is discussed.[NUCLEAR REACTIONS Na23(?,p), E=2.3-3.7 MeV; measured excitation function and deduced resonant strengths for p0 and p1 proton groups; NaCl target. Calculated new thermonuclear reaction rate.

Daniel P. Whitmire and Cary N. Davids

1974-03-01T23:59:59.000Z

330

Two-dimensional simulations of thermonuclear burn in ignition-scale inertial confinement fusion targets under compressed axial magnetic fields  

SciTech Connect (OSTI)

We report for the first time on full 2-D radiation-hydrodynamic implosion simulations that explore the impact of highly compressed imposed magnetic fields on the ignition and burn of perturbed spherical implosions of ignition-scale cryogenic capsules. Using perturbations that highly convolute the cold fuel boundary of the hotspot and prevent ignition without applied fields, we impose initial axial seed fields of 20–100 T (potentially attainable using present experimental methods) that compress to greater than 4 × 10{sup 4} T (400 MG) under implosion, thereby relaxing hotspot areal densities and pressures required for ignition and propagating burn by ?50%. The compressed field is high enough to suppress transverse electron heat conduction, and to allow alphas to couple energy into the hotspot even when highly deformed by large low-mode amplitudes. This might permit the recovery of ignition, or at least significant alpha particle heating, in submarginal capsules that would otherwise fail because of adverse hydrodynamic instabilities.

Perkins, L. J.; Logan, B. G.; Zimmerman, G. B.; Werner, C. J. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)] [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

2013-07-15T23:59:59.000Z

331

Internal Dosimetry  

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

21-2008 21-2008 October 2008 DOE STANDARD INTERNAL DOSIMETRY U.S. Department of Energy AREA SAFT Washington, D.C. 20585 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. NOT MEASUREMENT SENSITIVE ii This document is available on the Department of Energy Technical Standards Program Web Site at http://www.hss.energy.gov/nuclearsafety/techstds/ DOE-STD-1121-2008 iii FOREWORD 1. This Department of Energy (DOE) standard is approved for use by all DOE Components and their contractors. 2. Constructive comments (recommendations, additions, deletions) and any pertinent data that may improve this document should be sent to Office of Worker Safety and Health Policy (HS-11) U.S. Department of Energy Washington, DC 20585

332

Experimental comparison between markets on dynamic permit trading and investment in  

E-Print Network [OSTI]

Experimental comparison between markets on dynamic permit trading and investment in irreversible international expertise on economics, finance, geography, the environment, international development change and the environment. The Institute is funded by the Grantham Foundation for the Protection

333

Non-diffusive cross field transport in scrape-off-layer in Tokamak  

E-Print Network [OSTI]

tide energy etc. , thermonuclear fusion energy is the mostfusion are still under research, and will surely carry on in the International Thermonuclear

Yu, Guanghui

2006-01-01T23:59:59.000Z

334

21 11 13 INTERNATIONAL  

E-Print Network [OSTI]

31 E 32 F 32 #12; iv INTERNATIONAL ERGONOMICS ASSOCIATION #12; 3 INTERNATIONAL ERGONOMICS ASSOCIATION CODE OF CONDUCT ERGONOMICS ASSOCIATION (2006) http://www.iea.cc/browse.php?contID=international_ergonomics_association A6

Yamamoto, Hirosuke

335

International Student and  

E-Print Network [OSTI]

Admissions Disability Services International Student and Scholar Services International Student of Continuing Education Theresa Ganglghassemlouei and Beth Isensee, International Student and Scholar Services Colleges & Programs Student Outcomes: · Process improvements · Enhance orientation content based

Amin, S. Massoud

336

Experimental Datasets - Optimization Online  

E-Print Network [OSTI]

Mar 29, 2005 ... Content r Problem r Experimental Datasets s File Format ... is done at the level of the master function (the Gibbs energy) yet experimentally.

2005-03-29T23:59:59.000Z

337

Condensed hydrogen for thermonuclear fusion  

SciTech Connect (OSTI)

Inertial confinement fusion (ICF) power, in either pure fusion or fission-fusion hybrid reactors, is a possible solution for future world's energy demands. Formation of uniform layers of a condensed hydrogen fuel in ICF targets has been a long standing materials physics challenge. Here, we review the progress in this field. After a brief discussion of the major ICF target designs and the basic properties of condensed hydrogens, we review both liquid and solid layering methods, physical mechanisms causing layer nonuniformity, growth of hydrogen single crystals, attempts to prepare amorphous and nanostructured hydrogens, and mechanical deformation behavior. Emphasis is given to current challenges defining future research areas in the field of condensed hydrogens for fusion energy applications.

Kucheyev, S. O.; Hamza, A. V. [Nanoscale Synthesis and Characterization Laboratory, Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

2010-11-15T23:59:59.000Z

338

STEP Intern Job Description  

Broader source: Energy.gov [DOE]

STEP Intern Job Description, from the Tool Kit Framework: Small Town University Energy Program (STEP).

339

Assessor Training International  

E-Print Network [OSTI]

NVLAP Assessor Training International Arrangements #12;Assessor Training 2009: International;Assessor Training 2009: International Arrangements 3 2009 is the 10th anniversary of the signing granted by a signatory to the ILAC Arrangement #12;Assessor Training 2009: International Arrangements 4

340

Conference Proceedings International Conference  

E-Print Network [OSTI]

Conference Proceedings 10th International Conference on Hand-Arm Vibration 7-11 June 2004 Flamingo, the entertainment capital of the world: The 10th International Hand-Arm Vibration Conference will be the second time this international conference has been hosted in the US. The first was the 2nd International Hand-Arm Vibration

Hemmers, Oliver

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


341

Internal Audit Services  

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

Internal Audit Services Internal Audit Services Berkeley Lab Internal Audit Services Internal Audit Services Berkeley Lab Contacts Organizational Chart IAS Search Staff Only Lab Search Phone Book A-Z Index Privacy and Security Notice "Internal Auditing is an independent, objective assurance and consulting activity designed to add value and improve an organization's operations. It helps an organization accomplish its objectives by bringing a systematic, disciplined approach to evaluate and improve the effectiveness of risk management, control and governance processes." The Institute of Internal Auditors Standards for the Professional Practice of Internal Auditing About IAS | Audit Committee | Audit Planning | Ethics & Investigations | External Audit Coordination Advisory Services | Other Relevant Audit Links | Contacts | Organizational

342

Experimental studies of radiation damage of silicon detectors. Internal report  

SciTech Connect (OSTI)

New particle physics experiments are correlated with high luminosity and/or high energy. The new generation of colliding beam machines which will be constructed will make an extrapolation of a factor of 100 in the center of mass energy and of 1000 in luminosity beyond present accelerators. The scientific community hopes that very exciting physics results could be achieved this way, from the solution to the problem of electroweak symmetry breaking to the possible discovery of new, unpredicted phenomena. The particles which compose the radiation field are: electrons, pions, neutrons, protons and photons. It has become evident that the problem of the radiation resistance of detectors in this severe environment is a crucial one. This situation is complicated more by the fact that detectors must work all the run time of the machine, and better all the time of the experiment, without replacement (part or whole). So, studies related to the investigation of the radiation hardness of all detector parts, are developing. The studies are in part material and device characterization after irradiation, and in part technological developments, made in order to find harder, cheaper technologies, for larger surfaces. Semiconductor detectors have proven to be a good choice for vertex and calorimeter. Both fixed target machines and colliders had utilized in the past silicon junction detectors as the whole or part of the detection system. Precision beam hodoscopes and sophisticated trigger devices with silicon are equally used. The associated electronics in located near the detectors, and is subjected to the same radiation fields. Studies of material and device radiation hardness are developing in parallel. Here the authors present results on the radiation hardness of silicon, both as a bulk material and as detectors, to neutron irradiation at high fluences.

Angelescu, T.; Ghete, V.M.; Ghiordanescu, N.; Lazanu, I.; Mihul, A. [Univ. of Bucharest (Romania); Golutvin, I.; Lazanu, S.; Savin, I.; Vasilescu, A. [JINR, Dubna (Russian Federation); Biggeri, U.; Borchi, E.; Bruzzi, M. [Univ. of Florence (Italy)]|[INFN, Florence (Italy); Li, Z.; Kraner, H.W. [Brookhaven National Lab., Upton, NY (United States)

1994-02-01T23:59:59.000Z

343

Physica Scripta An International Journal for Experimental and Theoretical Physics  

E-Print Network [OSTI]

are considered instead of graphite or Carbon Fiber Composites (CFCs) [6,7]. There exist some very good semi times, tritium co-deposition and recovery is so serious an issue that other plasma facing materials

Nordlund, Kai

344

Numerical and Experimental Investigation of Internal Short Circuit...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Merit Review and Peer Evaluation es109kim2011p.pdf More Documents & Publications Battery Thermal Modeling and Testing Implantation, Activation, Characterization and...

345

Internal Audit Preparation Worksheet  

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

2 Internal Audit Preparation Job Aid 11_0304 Page 1 of 5 2 Internal Audit Preparation Job Aid 11_0304 Page 1 of 5 EOTA - Business Form Document Title: Internal Audit Preparation Job Aid Document Number: F-012 Rev. 11_0304 Document Owner: Elizabeth Sousa Backup Owner: Melissa Otero Approver(s): Melissa Otero Parent Document: P-007, Internal Audit Process Notify of Changes: Internal Auditors Referenced Document(s): F-011 Internal Audit Report F-012 Internal Audit Preparation Job Aid 11_0304 Page 2 of 5 Revision History: Rev. Description of Change A Initial Release 11_0304 Change title from Worksheet to Job Aid and changed revision from alpha to numeric for consistency. F-012 Internal Audit Preparation Job Aid 11_0304 Page 3 of 5 Internal Audit Preparation Worksheet F-012 Internal Audit Preparation Job Aid 11_0304 Page 4 of 5

346

Ris-R-1007(EN) Influence of Composition, Heat  

E-Print Network [OSTI]

Thermonuclear Experimental Reactor). The alloys have undergone different pre-irradiation heat treatments which- eration for their applications in the structural components of ITER (Inter- national Thermonuclear

347

Magnetic Braids Anthony Yeates  

E-Print Network [OSTI]

flux function Main result Conclusion 2. Thermonuclear confinement devices. ITER (Internat'l Thermonuclear Experimental Reactor). Inside the KSTAR tokamak. Correspond to periodic magnetic braids. 4 / 22

Dundee, University of

348

INERTIAL FUSION DRIVEN BY INTENSE HEAVY-ION BEAMS  

E-Print Network [OSTI]

Thermonuclear Experimental Reactor), now being constructed in Caderache, France [5]. In contrast, inertial fusion

Sharp, W. M.

2011-01-01T23:59:59.000Z

349

Coking theory: Internal stress in the coal batch  

Science Journals Connector (OSTI)

The development of local internal stress in the coal batch is analyzed on the basis of ... theoretical and experimental data. Its influence on coke quality is demonstrated. The influence of mineralized ... large ...

V. I. Sukhorukov

2011-09-01T23:59:59.000Z

350

International Standards for Telecommunications  

Science Journals Connector (OSTI)

...research-article International Standards for Telecommunications M. B. Williams As soon as telegraph...surprising that the International Telecommunications Union, the forum for world-wide...and evolution of all branches of telecommunications. Increasingly, the distinction...

M. B. Williams

1978-01-01T23:59:59.000Z

351

Essays in international trade  

E-Print Network [OSTI]

This thesis is a collection of essays on the effect of trade costs on international trade. Chapter 1 derives and empirically examines how factor proportions determine the structure of commodity trade when international ...

Romalis, John

2001-01-01T23:59:59.000Z

352

International aeronautical user charges  

E-Print Network [OSTI]

Introduction: 1.1 BACKGROUND AND MOTIVATION Very few issues relating to the international air transportation industry are today as divisive as those pertaining to user charges imposed at international airports and enroute ...

Odoni, Amedeo R.

1985-01-01T23:59:59.000Z

353

International Freshwater Agreements  

E-Print Network [OSTI]

Population Distribution ..................................................... 16 Population Density per, circa 1995............................................... 20 Dam Density per International River Basin ............................ 25 Africa ................................................................

Wolf, Aaron

354

International Commitments Primer | Department of Energy  

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

International Commitments International Commitments Primer International Commitments Primer Overview of International Commitment Process DOE pursues a variety of science and...

355

International Student Guide Mathematics  

E-Print Network [OSTI]

International Student Guide Mathematics www.swansea.ac.uk/maths www.swansea.ac.uk/science/international #12;Reasons to study at Swansea University Mathematics at Swansea University Established in 1920, 36th and more Over 15,000 students / Over 2,000 International students Strongest in Wales for Mathematics

Harman, Neal.A.

356

Wood Resources International  

E-Print Network [OSTI]

Wood Resources International Wood Raw Material Consumption on the Rise Despite Weak Global Economy UNECE Timber Committee Meeting October 7-8, 2003 Geneva, Switzerland Håkan Ekström Wood Resources International #12;Wood Resources International Outline · Roundwood Removals · Roundwood Consumption · Raw

357

Experimental Highlights - 2014  

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

NIF & Photon Science News Press Releases Experimental Highlights Efficiency Improvements Science & Technology Meetings and Workshops Papers and Presentations NIF&PS People In the...

358

THE INTERNATIONAL GEOLOGICAL CONGRESS  

Science Journals Connector (OSTI)

... , sections, plans, models in relief, c., to be found in the Exposition Universelle, will realise the expectations expressed in the circular of the International Committee, of an ...

T. STERRY HUNT

1878-06-06T23:59:59.000Z

359

HydroVision International  

Broader source: Energy.gov [DOE]

The HydroVision International Conference and Exhibition offers attendees countless opportunities to network, share best practices, meet with product and service providers, and more.  Held over five...

360

International petroleum statistics report  

SciTech Connect (OSTI)

This report provides information on current international petroleum production, demand, imports, and stocks. World oil demand and OECD demand data are presented for the years 1970 thru 1995.

NONE

1996-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


361

Internal Controls Evaluations  

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

assurance reviews need to be completed prior to the submission of quarterly and annual reports. Page | 6 Table 1: DOE Internal Controls Assessment Process Important Dates Date...

362

Parametric internal waves in a compressible fluid  

E-Print Network [OSTI]

We describe the effect of vibration on a confined volume of fluid which is density stratified due to its compressibility. We show that internal gravity-acoustic waves can be parametrically destabilized by the vibration. The resulting instability is similar to the classic Faraday instability of surface waves, albeit modified by the compressible nature of the fluid. It may be possible to observe experimentally near a gas-liquid critical point.

Kausik S. Das; Stephen W. Morris; A. Bhattacharyay

2007-10-11T23:59:59.000Z

363

Parametric internal waves in a compressible fluid  

E-Print Network [OSTI]

We describe the effect of vibration on a confined volume of fluid which is density stratified due to its compressibility. We show that internal gravity-acoustic waves can be parametrically destabilized by the vibration. The resulting instability is similar to the classic Faraday instability of surface waves, albeit modified by the compressible nature of the fluid. It may be possible to observe experimentally near a gas-liquid critical point.

Das, Kausik S; Bhattacharyay, A

2007-01-01T23:59:59.000Z

364

International Programs in Agriculture  

E-Print Network [OSTI]

International Programs in Agriculture MessagefromtheDirector­ Staying Ahead of Globalization and more prosperous place for all. Fortunately, Purdue International Programs in Agriculture (IPIA) has natural disasters caution us to remember the power of nature. The United Nations Food and Agriculture

365

International for Advanced Studies  

E-Print Network [OSTI]

and Technology at the University of Ulm ICAS-Affiliations The International Center for Advanced Studies in Health in medical technology and pharma- ceutical industry. The International Advisory Panel of ICAS consists, transfer of state-of-the-art clinical technologies, and utilization of methodologies appropriate

Pfeifer, Holger

366

International Conference Water Efficiency  

E-Print Network [OSTI]

International Conference Water Efficiency in Urban Areas Concepts, Technologies, Socio Economics for PostersRegistration via Fax: +49 941 29688-17 Yes, I will participate International Conference Water of the invoice. Payment must be received no later than 14 days before the conference begins (it has to be sett

Wehrli, Bernhard

367

STUDENT HANDBOOK INTERNATIONAL  

E-Print Network [OSTI]

STUDENT HANDBOOK INTERNATIONAL 2011-12 #12;2 International Student Handbook 2011-12 Contents Volunteering 30 Sport and physical activity 31 Local transport 32 Exploring Leeds and the UK 36 Families to start a new period in your life. We hope this handbook will help you to make the most of your time

Haase, Markus

368

International Energy Module  

Gasoline and Diesel Fuel Update (EIA)

he International Energy Module determines changes in the world oil price and the supply prices of crude he International Energy Module determines changes in the world oil price and the supply prices of crude oils and petroleum products for import to the United States in response to changes in U.S. import requirements. A market clearing method is used to determine the price at which worldwide demand for oil is equal to the worldwide supply. The module determines new values for oil production and demand for regions outside the United States, along with a new world oil price that balances supply and demand in the international oil market. A detailed description of the International Energy Module is provided in the EIA publication, Model Documentation Report: The International Energy Module of the National Energy Modeling System, DOE/EIA-M071(06), (Washington, DC, February 2006).

369

SSRL- Experimental Run Schedule  

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

FY2008 Experimental Run Schedules 2008 Run Ends August 11, 2008. User Operations will resume November 2008. Operating Maintenance Beam Line Schedule FY2009 FY2008 X-ray (1-4,...

370

Experimental Theatre in Venezuela  

E-Print Network [OSTI]

4 LATIN AMERICAN THEATRE REVIEW Experimental Theatre in Venezuela The I Jornadas de Búsqueda y Experimentación Teatral took place March 21-May 19, 1985 in Caracas. Organized by the Centro Latinoamericano de Creación e Investigación Teatral... of the festival was to give an opportunity for experimental theatre groups to present their work and thus to show the current tendencies of unconventional theatre in Venezuela. The participating groups (among them Shock Teatral, Contradanza, Taller...

Editors

1985-10-01T23:59:59.000Z

371

Renewable Energy Resources Inc formerly Internal Hydro International Inc |  

Open Energy Info (EERE)

Internal Hydro International Inc Internal Hydro International Inc Jump to: navigation, search Name Renewable Energy Resources Inc (formerly Internal Hydro International Inc) Place Tampa, Florida Zip 33603 Sector Hydro Product Internal Hydro's technology takes waste, pumped pressures of fluids, gases or the constantly available natural flows of water and extracts power from them via a turbine. References Renewable Energy Resources Inc (formerly Internal Hydro International Inc)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Renewable Energy Resources Inc (formerly Internal Hydro International Inc) is a company located in Tampa, Florida . References ↑ "Renewable Energy Resources Inc (formerly Internal Hydro

372

International Energy Statistics  

Gasoline and Diesel Fuel Update (EIA)

> Countries > International Energy Statistics > Countries > International Energy Statistics International Energy Statistics Petroleum Production| Annual Monthly/Quarterly Consumption | Annual Monthly/Quarterly Capacity | Bunker Fuels | Stocks | Annual Monthly/Quarterly Reserves | Imports | Annual Monthly/Quarterly Exports | CO2 Emissions | Heat Content Natural Gas All Flows | Production | Consumption | Reserves | Imports | Exports | Carbon Dioxide Emissions | Heat Content Coal All Flows | Production | Consumption | Reserves | Imports | Exports | Carbon Dioxide Emissions | Heat Content Electricity Generation | Consumption | Capacity | Imports | Net Imports | Exports | Distribution Losses | Heat Content Renewables Electricity Generation| Electricity Consumption | Biofuels Production | Biofuels Consumption | Heat Content Total Energy

373

International petroleum statistics report  

SciTech Connect (OSTI)

The International Petroleum Statistics Report is a monthly publication that provides current international oil data. This report presents data on international oil production, demand, imports, exports and stocks. The report has four sections. Section 1 contains time series data on world oil production, and on oil demand and stocks in the Organization for Economic Cooperation and Development (OECD). Section 2 presents an oil supply/demand balance for the world, in quarterly intervals for the most recent two years. Section 3 presents data on oil imports by OECD countries. Section 4 presents annual time series data on world oil production and oil stocks, demand, and trade in OECD countries.

NONE

1995-10-01T23:59:59.000Z

374

Comparison of the recently proposed super-Marx generator approach to thermonuclear ignition with the deuterium-tritium laser fusion-fission hybrid concept by the Lawrence Livermore National Laboratory  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

The recently proposed super-Marx generator pure deuterium microdetonation ignition concept is compared to the Lawrence Livermore National Ignition Facility (NIF) Laser deuterium-tritium fusion-fission hybrid concept (LIFE). In a super-Marx generator, a large number of ordinary Marx generators charge up a much larger second stage ultrahigh voltage Marx generator from which for the ignition of a pure deuterium microexplosion an intense GeV ion beam can be extracted. Typical examples of the LIFE concept are a fusion gain of 30 and a fission gain of 10, making up a total gain of 300, with about ten times more energy released into fission as compared to fusion. This means the substantial release of fission products, as in fissionless pure fission reactors. In the super-Marx approach for the ignition of pure deuterium microdetonation, a gain of the same magnitude can, in theory, be reached. If feasible, the super-Marx generator deuterium ignition approach would make lasers obsolete as a means for the ignition of thermonuclear microexplosions.

Winterberg, F.

2009-10-29T23:59:59.000Z

375

NUCLEAR ISLANDS International Leasing  

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

ISLANDS ISLANDS International Leasing of Nuclear Fuel Cycle Sites to Provide Enduring Assurance of Peaceful Use Christopher E. Paine and Thomas B. Cochran Current International Atomic Energy Agency safeguards do not provide adequate protection against the diversion to military use of materials or technology from certain types of sensitive nuclear fuel cycle facilities. In view of highly enriched uranium's relatively greater ease of use as a nuclear explosive material than plutonium and the significant diseconomies of commercial spent fuel reprocessing, this article focuses on the need for improved international controls over uranium enrichment facilities as the proximate justification for creation of an International Nuclear Fuel Cycle Association (INFCA). In principle, the proposal is equally applicable to alleviating the proliferation concerns provoked by nuclear fuel

376

admission guide International  

E-Print Network [OSTI]

2015/ 2016 admission guide International First-Year Students #12;2 3 WORLDWIDE RECOGNITION (2008 and Digital Media Critical Studies* Integrated Critical Practice* Production* German Studies Global Economics Networks Computer Science Computer Science: Computer Game Design Electrical Engineering Communications

California at Santa Cruz, University of

377

International Summer School2014  

E-Print Network [OSTI]

International Summer Camp 11 Session 3 Intensive Training on Chinese Language 15 About Dalian 19 #12;#12;About a century, and having gone through the persistent efforts of several generations, DUT has developed

Haviland, David

378

International Energy Agency  

Broader source: Energy.gov [DOE]

The International Energy Agency (IEA) provides a mechanism for member countries to task- and cost-share research activities through two agreements—one supporting hydrogen activities and another...

379

International petroleum statistics report  

SciTech Connect (OSTI)

This report presents data on international oil production, demand, imports, exports, and stocks. World oil production and OECD demand data are for the years 1970 through 1994; OECD stocks from 1973 through 1994; and OECD trade from 1984 through 1994.

NONE

1996-03-01T23:59:59.000Z

380

International petroleum statistics report  

SciTech Connect (OSTI)

This report presents data on international oil production, demand, imports, and stocks. World oil production and OECD demand data are for the years 1970 through 1995; stocks from 1973 through 1995, and trade from 1985 through 1995.

NONE

1996-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


381

CCPPolicyBriefing International  

E-Print Network [OSTI]

: +44 (0)1603 593715 A: UEA, Norwich, NR4 7TJ Modelling international wind energy diffusion: www.uea.ac.uk/ccp T: +44 (0)1603 593715 A: UEA, Norwich, NR4 7TJ

Feigon, Brooke

382

Internal Dose Estimates from  

E-Print Network [OSTI]

Appendix F Internal Dose Estimates from NTS Fallout F-1 #12;Radiation Dose to the Population;TABLE OF CONTENTS Page F- Part I. Estimates of Dose...........................................................................................40 Comparison to dose estimates from global fallout

383

INTERNATIONAL PACIFIC RESEARCH CENTER  

E-Print Network [OSTI]

INTERNATIONAL PACIFIC RESEARCH CENTER APRIL 2004­MARCH 2005 REPORT SCHOOL OF OCEAN AND EARTH RESEARCH HIGHLIGHTS Indo-Pacific Ocean Climate Pacific Research Center Design by: Susan Yamamoto Printed by: Hagadone Printing Company Photo: Waikiki

Wang, Yuqing

384

INTERNATIONAL ENERGY AND ENVIRONMENT  

E-Print Network [OSTI]

in a heat pump cooling system, thereby alleviating peak electricity consumption and associated emissions substituting for banned fluorocarbon refrigerants, coping with carbon costing and reducing water consumptionINTERNATIONAL ENERGY AND ENVIRONMENT FOUNDATION Computational Fluid Dynamics Modeling

385

international | netl.doe.gov  

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

International Activity in Gasification and Coal to Liquids Development News Gasifipedia Coal-Biomass Feed Advanced Fuels Synthesis Systems Analyses International Activity Project...

386

SRI International | Open Energy Information  

Open Energy Info (EERE)

SRI International Jump to: navigation, search Name: SRI International Region: United States Sector: Marine and Hydrokinetic Website: http:www.sri.com This company is listed in...

387

Greenlife International | Open Energy Information  

Open Energy Info (EERE)

Francisco, California Zip: 94111 Product: GreenLife International is a biodiesel manufacturer and equipment saler References: Greenlife International1 This article is a stub....

388

Experimental Path End  

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

Fin de la ruta experimental Fin de la ruta experimental Volver Principal ESTOY PERDIDO!!! Usted ha conocido las técnicas usadas para registrar las evidencias experimentales que sustentan el Modelo Standard. En resumen, podemos decir que los físicos usan los aceleradores para "espiar" dentro de la estructura de las partículas. Los detectores recogen datos, que son analnizados primero por computadoras y luego por personas. Usted ha llegado al final de la ruta de la evidencia experimental. A pesar que las evidencias experimentales han dado un amplio sustento al Modelo Standard, es necesario reconocer que aún queda mucho por aprender. En particular, los físicos están plagados de problemas relacionados con los neutrinos, la materia oscura, y la imposibilidad de incluir la gravedad en

389

SWAT Goes International  

E-Print Network [OSTI]

#1; tx H2O | pg. 18 International researchers and program managers in 90 countries around the world use the Soil and Water Assessment Tool (SWAT) model. Germany, the first country interested in SWAT, uses it to model its large watersheds, said... Laboratory. To answer this expanding interest worldwide, the research team organized the first international SWAT conference in 2001 in Germany with 35 participants from 16 countries and five continents presenting 20 papers. ?This conference gave us a...

Wythe, Kathy

2007-01-01T23:59:59.000Z

390

International petroleum statistics report  

SciTech Connect (OSTI)

This monthly publication provides current international oil data. The Report presents data on international oil production, demand, imports, exports, and stocks. Section 1 contains time series data on world oil production, and on oil demand and stocks in the OECD. Section 2 presents an oil supply/demand balance for the world. Section 3 presents data on oil imports by OECD countries. Section 4 presents annual time series data on world oil production and oil stocks, demand, and trade in OECD countries.

Not Available

1994-05-01T23:59:59.000Z

391

International Energy Agency  

Broader source: Energy.gov [DOE]

DOE's market transformation efforts have reached to European and other countries who are part of the international distributed and decentralized energy community. Through its partnership with DOE, the combined heat and power (CHP) program of the International Energy Agency (IEA) conducts research and analysis of CHP markets and deployment efforts around the world and has used lessons learned from U.S. research, development, and deployment efforts to recommend market transformation activities and policies that will lead to new CHP installations worldwide.

392

International Energy Agency  

SciTech Connect (OSTI)

The growing need for international cooperation in energy led to the establishment of the International Energy Agency (IEA) in 1974 as a forum for the 21 participating countries to coordinate their energy planning. The IEA provides a framework within the cooperating efforts of its participating countries which reinforce one another and improve the overall energy situation. This brief report reviews the objectives of the IEA and the activities of the Advisory Council.

Taylor, N.R.

1983-01-01T23:59:59.000Z

393

Detailed search US supports Japanese bid to host ITER as France urges Europe to go it alone  

E-Print Network [OSTI]

support of his country for the Japanese bid to host the international thermonuclear site (ITER thermonuclear site if the French candidate is not selected for the international project. However

394

CONCENTRATES  

Science Journals Connector (OSTI)

Cadarache, France, was selected last week to be the site for the International Thermonuclear Experimental Reactor (ITER) project. ... ITER's goal is to demonstrate a self-sustaining fusion reaction in a power-plant-like environment that could lead to commercial nuclear fusion power plants by the turn of the century, said Raymond L. Orbach, head of the Department of Energy's Office of Science. ...

2005-07-04T23:59:59.000Z

395

Prospects for attractive fusion power systems  

Science Journals Connector (OSTI)

...Robinson Prospects for attractive fusion power systems Farrokh Najmabadi...commercial product. Today's fusion experiments, by their charter...power plant; the International Thermonuclear Experimental Reac- tor (ITER...for rapid maintenance of the fusion core (the so-called mean...

1999-01-01T23:59:59.000Z

396

Funding for nuclear fusion Expensive Iteration  

E-Print Network [OSTI]

producing more energy than is put in. The International Thermonuclear Experimental Reactor became plain ITER aims to produce energy by fusing together the nuclei of hydrogen atoms, confined in a magnetic field. The proposal also needs approval from the European Parliament. Some Green MEPs have called for ITER

397

Hydrogen recycling with multistep and resonance line absorption effects  

SciTech Connect (OSTI)

Recycling of hydrogen at a neutralizer plate in a tokamak divertor is considered, with particular emphasis on the effects of multistep atomic processes and photoexcitation by the resonant Lyman {alpha} line. These effects are shown to be significant for parameters relevant to International Thermonuclear Experimental Reactor (ITER) (S. A. Cohen {ital et} {ital al}., J. Nucl. Mater. {bold 176} {bold 177}, 909 (1990)).

Marchand, R.; Lauzon, J. (INRS-Energie, C. P. 1020, Varennes, Quebec J3X 1S2 (Canada))

1992-04-01T23:59:59.000Z

398

Sir --Your Editorial "Time for Japan to shine?" (Nature 427, 763; 2004) clearly  

E-Print Network [OSTI]

that the United States and Japan refuse a direct and objective comparison of the technical assets of the European the necessity of building ITER, formerly the International Thermonuclear Experimental Reactor. But I must say of the JT-60 tokamak to achieve critical science on the way to Demo, the engineering prototype reactor

399

Margaret Thatcher's influence on British science  

Science Journals Connector (OSTI)

...long-term: in 1990 a commercial fusion reactor was promised by the...built. The most productive fusion reaction for energy generation...and the economic case for a fusion reactor, as for a fast breeder...Russia (the International Thermonuclear Experimental Reactor). Agriculture...

2014-01-01T23:59:59.000Z

400

Japan's tokamak success boosts its bid for reactor  

Science Journals Connector (OSTI)

... Tokyo. Japan's upgraded tokamak fusion reactor, JT-60U, has achieved a long sought-after goal ... conditions 'equivalent' to breakeven, where energy output equals energy input. This will strengthen Japan's bid to host the International Thermonuclear Experimental Reactor (ITER), if the machine, ...

David Swinbanks

1996-11-14T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


401

Experimental Neutrino Physics  

ScienceCinema (OSTI)

In this talk, I will review how a set of experiments in the last decade has given us our current understanding of neutrino properties.  I will show how experiments in the last year or two have clarified this picture, and will discuss how new experiments about to start will address remaining questions.  I will particularly emphasize the relationship between various experimental techniques.

Chris Walter

2010-01-08T23:59:59.000Z

402

ScienceTheoretical Experimental  

E-Print Network [OSTI]

Graphics · Operating Systems Design · Computer Networks · Computer architecture · Parallel processors and processing · Multiprocessor architecture · Interconnection networks in parallel computers · Numerical Linear#12;· · · ScienceTheoretical Experimental Computational #12;Discipline Specific Knowledge

403

The effect of internal magnetic structure on the fishbone instability  

SciTech Connect (OSTI)

Plasmas exhibiting the ``fishbone`` instability studied on the PBX-M tokamak show a distinct relationship between the plasma shape, the internal magnetic structure, and the presence or absence of fast ion losses associated with the fishbone mode. We have, for the first time, carried out measurements of the magnetic safety factor profile in fishbone-unstable plasmas, and used the knowledge of the associated experimental equilibria to compare the stability and fast ion loss properties of these plasmas with experimental observations.

Roberts, D.W.; Powell, E. [Lawrence Livermore National Lab., CA (United States); Kaita, R.; Bell, R.; Chance, M.; Hatcher, R.; Holland, A.; Kaye, S.; Kessel, C.; Kugel, H.; LeBlanc, B.; Manickam, J.; Okabayashi, M.; Paul, S.; Pomphrey, N.; Sauthoff, N.; Sesnic, S.; Takahashi, H.; White, R. [Princeton Univ., NJ (United States). Plasma Physics Lab.; Levinton, F. [Fusion Physics and Technologies, Torrance, CA (United States); Asakura, N. [Tokyo Univ. (Japan); Duperrex, P. [Ecole Polytechnique Federale, Lausanne (Switzerland); Gammel, G. [Grumman Corp., Bethpage, NY (United States)

1992-01-01T23:59:59.000Z

404

The effect of internal magnetic structure on the fishbone instability  

SciTech Connect (OSTI)

Plasmas exhibiting the fishbone'' instability studied on the PBX-M tokamak show a distinct relationship between the plasma shape, the internal magnetic structure, and the presence or absence of fast ion losses associated with the fishbone mode. We have, for the first time, carried out measurements of the magnetic safety factor profile in fishbone-unstable plasmas, and used the knowledge of the associated experimental equilibria to compare the stability and fast ion loss properties of these plasmas with experimental observations.

Roberts, D.W.; Powell, E. (Lawrence Livermore National Lab., CA (United States)); Kaita, R.; Bell, R.; Chance, M.; Hatcher, R.; Holland, A.; Kaye, S.; Kessel, C.; Kugel, H.; LeBlanc, B.; Manickam, J.; Okabayashi, M.; Paul, S.; Pomphrey, N.; Sauthoff, N.; Sesnic, S.; Takahashi, H.; White, R. (Princeton Univ., NJ (United States). Plasma Physics Lab.); Levinton, F. (Fusion Physics and Technologies, Torrance, CA (Uni

1992-01-01T23:59:59.000Z

405

SCIENCE/TECHNOLOGY CONCENTRATE  

Science Journals Connector (OSTI)

International pact on fusion studies signed ... Europe, Japan, and the U.S. are to collaborate on thermonuclear fusion. ...

1986-02-03T23:59:59.000Z

406

E-Print Network 3.0 - ambitious nuclear power Sample Search Results  

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

powers like China and India". The French president said the International Thermonuclear ... Source: Fusiongnition Research Experiment (FIRE) Collection: Plasma Physics...

407

Assessor Training Internal Audits and  

E-Print Network [OSTI]

NVLAP Assessor Training Internal Audits and Management Reviews #12;Assessor Training 2009, quarterly, etc., schedule throughout the year #12;Assessor Training 2009: Internal Audits and Management a copy of the full internal audit schedule. #12;Assessor Training 2009: Internal Audits and Management

408

Charles Darwin University 1 INTERNATIONAL  

E-Print Network [OSTI]

in Australia; to safeguard Australia's international reputation as a provider of high quality education

409

Experimental Criticality Benchmarks for SNAP 10A/2 Reactor Cores  

SciTech Connect (OSTI)

This report describes computational benchmark models for nuclear criticality derived from descriptions of the Systems for Nuclear Auxiliary Power (SNAP) Critical Assembly (SCA)-4B experimental criticality program conducted by Atomics International during the early 1960's. The selected experimental configurations consist of fueled SNAP 10A/2-type reactor cores subject to varied conditions of water immersion and reflection under experimental control to measure neutron multiplication. SNAP 10A/2-type reactor cores are compact volumes fueled and moderated with the hydride of highly enriched uranium-zirconium alloy. Specifications for the materials and geometry needed to describe a given experimental configuration for a model using MCNP5 are provided. The material and geometry specifications are adequate to permit user development of input for alternative nuclear safety codes, such as KENO. A total of 73 distinct experimental configurations are described.

Krass, A.W.

2005-12-19T23:59:59.000Z

410

International Energy Outlook - Preface  

Gasoline and Diesel Fuel Update (EIA)

Preface Preface International Energy Outlook 2004 Preface This report presents international energy projections through 2025, prepared by the Energy Information Administration, including outlooks for major energy fuels and issues related to electricity and the environment. The International Energy Outlook 2004 (IEO2004) presents an assessment by the Energy Information Administration (EIA) of the outlook for international energy markets through 2025. U.S. projections appearing in IEO2004 are consistent with those published in EIAÂ’s Annual Energy Outlook 2004 (AEO2004), which was prepared using the National Energy Modeling System (NEMS). IEO2004 is provided as a service to energy managers and analysts, both in government and in the private sector. The projections are used by international agencies, Federal and State governments, trade associations, and other planners and decisionmakers. They are published pursuant to the Department of Energy Organization Act of 1977 (Public Law 95-91), Section 205(c). The IEO2004 projections are based on U.S. and foreign government laws in effect on October 1, 2003.

411

International Activities | Department of Energy  

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

International Activities International Activities International Activities International Activities The International Program assists the DOE Office of Environmental Management (EM) in identifying technologies and strategies for waste processing, groundwater and soil remediation, spent nuclear fuel and surplus nuclear material disposition, and facility deactivation and decommissioning. The International Program seeks to transform advances in science and engineering into practical solutions for environmental remediation. Collaboration with governmental, academic, and industrial organizations in other countries expands the technical depth of the EM program. Working with the international community offers the opportunity to develop consensus on approaches to science, technology and policy for environmental

412

International Energy Outlook 2000  

Gasoline and Diesel Fuel Update (EIA)

0 0 Notes: Today, the Energy Information Administration (EIA) releases its mid-term projections of international energy use and carbon emissions, published in the International Energy Outlook 2000 (IEO2000). The IEO2000 report provides an assessment of world energy markets with projections of regional energy consumption, energy consumption by primary fuel, electricity consumption, carbon emissions, nuclear generating capacity, international coal trade flows, and energy use in the transportation sector. World oil production projections are also included in the report. The report is an extension of EIA's Annual Energy Outlook (AEO), and the U.S. projections that appear in the IEO are consistent with those published in the AEO. World energy consumption in this year's IEO2000 is projected to

413

International Energy Outlook 1999  

Gasoline and Diesel Fuel Update (EIA)

ieo99cvr.gif (8385 bytes) ieo99cvr.gif (8385 bytes) Preface This report presents international energy projections through 2020, prepared by the Energy Information Administration. The outlooks for major energy fuels are discussed, along with electricity, transportation, and environmental issues. The International Energy Outlook 1999 (IEO99) presents an assessment by the Energy Information Administration (EIA) of the outlook for international energy markets through 2020. The report is an extension of EIAÂ’s Annual Energy Outlook 1999 (AEO99), which was prepared using the National Energy Modeling System (NEMS). U.S. projections appearing in IEO99 are consistent with those published in AEO99. IEO99 is provided as a statistical service to energy managers and analysts, both in government and in the private

414

International Energy Outlook 2000  

Gasoline and Diesel Fuel Update (EIA)

2000 2000 with projections to 2020 March 16, 2000 Jay E. Hakes Energy Information Administration Next slide Back to first slide View graphic version Notes: Today, the Energy Information Administration (EIA) releases its mid-term projections of international energy use and carbon emissions, published in the International Energy Outlook 2000 (IEO2000). The IEO2000 report provides an assessment of world energy markets with projections of regional energy consumption, energy consumption by primary fuel, electricity consumption, carbon emissions, nuclear generating capacity, international coal trade flows, and energy use in the transportation sector. World oil production projections are also included in the report. The report is an extension of EIA's Annual Energy Outlook (AEO),

415

International Energy Module  

Gasoline and Diesel Fuel Update (EIA)

This page intentionally left blank This page intentionally left blank 23 U.S. Energy Information Administration | Assumptions to the Annual Energy Outlook 2011 International Energy Module The NEMS International Energy Module (IEM) simulates the interaction between U.S. and global petroleum markets. It uses assumptions of economic growth and expectations of future U.S. and world crude-like liquids production and consumption to estimate the effects of changes in U.S. liquid fuels markets on the international petroleum market. For each year of the forecast, the NEMS IEM computes world oil prices, provides a supply curve of world crude-like liquids, generates a worldwide oil supply- demand balance with regional detail, and computes quantities of crude oil and light and heavy petroleum products imported into

416

international | OpenEI  

Open Energy Info (EERE)

international international Dataset Summary Description These estimates are derived from the best available solar resource datasets available to NREL by country. These vary in spatial resolution from 1 km to 1 degree (approximately 100 km) depending on the data source. High spatial resolution datasets (1 km to 40 km cells) were modeled to support country or regional projects. Where high resolution datasets were not available, data from NASA's Surface Meteorology and Solar Energy (SSE) version 6 database were used. The data represents total potential solar energy per year as a function of land area per solar class (KWh/m²/day). Source National Renewable Energy Laboratory Date Released Unknown Date Updated Unknown Keywords capacity clean energy energy international

417

International Energy Module  

Gasoline and Diesel Fuel Update (EIA)

2 2 International Energy Module The NEMS International Energy Module (IEM) simulates the interaction between U.S. and global petroleum markets. It uses assumptions of economic growth and expectations of future U.S. and world crude-like liquids production and consumption to estimate the effects of changes in U.S. liquid fuels markets on the international petroleum market. For each year of the forecast, the NEMS IEM computes oil prices, provides a supply curve of world crude-like liquids, generates a worldwide oil supply- demand balance with regional detail, and computes quantities of crude oil and light and heavy petroleum products imported into the United States by export region. Changes in the oil price (WTI), which is defined as the price of light, low-sulfur crude oil delivered to Cushing, Oklahoma in

418

International energy outlook 1994  

SciTech Connect (OSTI)

The International Energy Outlook 1994 (IEO94) presents an assessment by the Energy Information Administration (EIA) of the outlook for international energy markets between 1990 and 2010. The report is provided as a statistical service to assist energy managers and analysts, both in government and in the private sector. These forecasts are used by international agencies, Federal and State governments, trade associations, and other planners and decisionmakers. They are published pursuant to the Depart. of Energy Organization Act of 1977 (Public Law 95-91), Section 205(c). The IEO94 projections are based on US and foreign government policies in effect on October 1, 1993-which means that provisions of the Climate Change Action Plan unveiled by the Administration in mid-October are not reflected by the US projections.

Not Available

1994-07-01T23:59:59.000Z

419

International petroleum statistics report  

SciTech Connect (OSTI)

This document is a monthly publication that provides current international oil data. The Report presents data on international oil production, demand, imports, exports, and stocks. Section 1 contains time series data on world oil production, and on oil demand and stocks in the OECD. Section 2 presents an oil supply/demand balance for the world. This balance is presented in quarterly intervals for the most recent two years. Section 3 presents data on oil imports by OECD countries. Section 4 presents annual time series data on world oil production and oil stocks, demand and trade in OECD countries.

Not Available

1994-12-01T23:59:59.000Z

420

The 33st International Electric Propulsion Conference, The George Washington University, USA October 6 10, 2013  

E-Print Network [OSTI]

obtained using an experimental setup for SEE measurements at PPPL [3]. One of the main concerns Research Physicist, Plasma Science and Technology, yraitses@pppl.gov. M #12;The 33st International Electric

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


421

Disilane Internal Rotation  

Science Journals Connector (OSTI)

Disilane Internal Rotation ... Energetics of hindered rotation in disilane are analyzed and compared to ethane. ... In disilane weakened (rotationally governed) hyperconjugative interactions, paramount in controlling the ethane barrier, leave the nonrotational part of the torsional coordinate as the primary contribution to disilane barrier energetics. ...

Vojislava Pophristic; Lionel Goodman; Cheryl T. Wu

2001-07-17T23:59:59.000Z

422

Telecommunications International Cell Phone  

E-Print Network [OSTI]

Telecommunications International Cell Phone 1. Fax completed form to 979.847.1111. 2. If you do will be charged. Date Cell Phone Needed Cell Phone Pick-Up Date Cell Phone User Travel Destination(s) United States Number Destination Country Number Cell Phone Type Digital Satellite Cell Phone Return Date Notes

423

International petroleum statistics report  

SciTech Connect (OSTI)

The International Petroleum Statistics Report is a monthly publication that provides current international oil data. This report is published for the use of Members of Congress, Federal agencies, State agencies, industry, and the general public. Publication of this report is in keeping with responsibilities given the Energy Information Administration in Public Law 95-91. The International Petroleum Statistics Report presents data on international oil production, demand, imports, and stocks. The report has four sections. Section 1 contains time series data on world oil production, and on oil demand and stocks in the Organization for Economic Cooperation and Development (OECD). This section contains annual data beginning in 1985, and monthly data for the most recent two years. Section 2 presents an oil supply/demand balance for the world. This balance is presented in quarterly intervals for the most recent two years. Section 3 presents data on oil imports by OECD countries. This section contains annual data for the most recent year, quarterly data for the most recent two quarters, and monthly data for the most recent twelve months. Section 4 presents annual time series data on world oil production and oil stocks, demand, and trade in OECD countries. World oil production and OECD demand data are for the years 1970 through 1995; OECD stocks from 1973 through 1995; and OECD trade from 1985 through 1995.

NONE

1997-05-01T23:59:59.000Z

424

International energy outlook 1996  

SciTech Connect (OSTI)

This International Energy Outlook presents historical data from 1970 to 1993 and EIA`s projections of energy consumption and carbon emissions through 2015 for 6 country groups. Prospects for individual fuels are discussed. Summary tables of the IEO96 world energy consumption, oil production, and carbon emissions projections are provided in Appendix A. The reference case projections of total foreign energy consumption and of natural gas, coal, and renewable energy were prepared using EIA`s World Energy Projection System (WEPS) model. Reference case projections of foreign oil production and consumption were prepared using the International Energy Module of the National Energy Modeling System (NEMS). Nuclear consumption projections were derived from the International Nuclear Model, PC Version (PC-INM). Alternatively, nuclear capacity projections were developed using two methods: the lower reference case projections were based on analysts` knowledge of the nuclear programs in different countries; the upper reference case was generated by the World Integrated Nuclear Evaluation System (WINES)--a demand-driven model. In addition, the NEMS Coal Export Submodule (CES) was used to derive flows in international coal trade. As noted above, foreign projections of electricity demand are now projected as part of the WEPS. 64 figs., 62 tabs.

NONE

1996-05-01T23:59:59.000Z

425

Internal Control Program  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

To ensure sound internal controls and overall consistency in exercising the statutory authorities that vest in the Secretary, the Administrator, National Nuclear Security Administration (NNSA), and Department's Chief Financial Officer (CFO), and to implement the Federal Managers' Financial Integrity Act of 1982 and related central agency guidance. Cancels DOE O 413.1A.

2008-10-28T23:59:59.000Z

426

Internal Dose Estimates from  

E-Print Network [OSTI]

Appendix H Internal Dose Estimates from Global Fallout H-1 #12;Radiation Dose to the Population. 263-MQ-008090 September 30, 2000 H-2 #12;Radiation Dose to the Population of the Continental United Site Part I. Estimates of Dose Lynn R. Anspaugh Lynn R. Anspaugh, Consulting Salt Lake City, UT Report

427

INTERNATIONAL COUNCIL FOR SCIENCE  

E-Print Network [OSTI]

of the African Climate System (VACS) Panel 13 and15 July 2006 Tanzanian Meteorology Agency, Dar es Salaam Workshop (see workshop report no. XXXXX). The first day was held jointly with the workshop at the Dar es Salaam International Conference Centre. The rest of the meeting was kindly hosted at the Tanzania

Quartly, Graham

428

International Studies Degree  

E-Print Network [OSTI]

Business Administration Foreign Affairs Specialist US Department of Energy Lead Case Advocate Houston AreaBGSU® n n n What I did with my International Studies Degree Bowing Green State University 103 Shatzel Hall Bowling Green, OH 43403-0001 n n n isp@bgsu.edu http://www.bgsu.edu/departments/isp n n n

Moore, Paul A.

429

International Jordan Expedition 1966  

Science Journals Connector (OSTI)

... IN 1963 and 1965 British expeditions visited the Azraq oasis and surrounding desert in Jordan arid reported on the favour-ability of the area as a ... in Jordan arid reported on the favour-ability of the area as a Desert National Park and site for an International Biological Station dealing with oasis and ...

J. MORTON BOYD

1966-11-12T23:59:59.000Z

430

INTERNATIONAL PACIFIC RESEARCH CENTER  

E-Print Network [OSTI]

INTERNATIONAL PACIFIC RESEARCH CENTER APRIL 2005­MARCH 2006 REPORT SCHOOL OF OCEAN AND EARTH Center 1 The Year's Highlights 3 Indo-Pacific Ocean Climate 4 Regional-Ocean Influences 10 Asian Ocean Climate: To understand climate variations in the Pacific and Indian oceans on interannual

Wang, Yuqing

431

International Pacific Research Center  

E-Print Network [OSTI]

International Pacific Research Center APRIL 2007­MARCH 2008 REPORT School of Ocean and Earth Center i Foreword ii iv Indo-Pacific Ocean Climate 1 Regional-Ocean Influences 13 Asian by the following broad research themes and goals of the IPRC Science Plan. Indo-Pacific Ocean Climate

Wang, Yuqing

432

INTERNATIONAL PACIFIC RESEARCH CENTER  

E-Print Network [OSTI]

INTERNATIONAL PACIFIC RESEARCH CENTER Annual Report April 2006 ­ March 2007 School of Ocean Research Center 1 2 The Year's Highlights 3 Research Accomplishments Indo-Pacific Ocean Climate 4 Regional-Ocean Ocean Climate: To understand climate variations in the Pacific and Indian oceans on inter- annual

Wang, Yuqing

433

Equity in international agreements  

SciTech Connect (OSTI)

Approaches to establishing equitable greenhouse gas emission policies among different nations are briefly discussed. The impact of energy efficiency is proposed as an aid to equitable resource distribution. A comprehensive approach which would account for changes in net greenhouse gases is discussed. In addition, international trading of net greenhouse gas emissions reduction credits is proposed.

Stewart, R. [Georgetown Univ. Law Center, Washington, DC (United States)

1992-12-31T23:59:59.000Z

434

13th International Conference on Chlamydomonas  

SciTech Connect (OSTI)

The 13th International Conference on Chlamydomonas (EMBO Workshop on the Cell and Molecular Biology of Chlamydomonas) was held May 27 to June 1, 2008 in Hyeres, France. The conference was the biennial meeting for all researchers studying the green algal systems Chlamydomonas and Volvox. The conference brought together approximately 200 investigators from around the world (North America, Asia, Europe and Australia) representing different fields and disciplines (cell biology, genetics, biochemistry, biophysics, plant physiology, genomics). It provided an opportunity for investigators from different countries to share methodologies and to discuss recent results with a focus on the Chlamydomonas experimental system.

Silflow, Carolyn D. [University of Minnesota

2014-03-11T23:59:59.000Z

435

International Student Guide www.swansea.ac.uk/international  

E-Print Network [OSTI]

Nanotechnology l MSc Petroleum Engineering (subject to validation) l Product Design l Sports Science Environment Business l International Trade l International Commercial l Law and Globalisation Medicine Biochemistry l million Institute of Life Science, Multidisciplinary Nanotechnology Centre, Institute of Environmental

Martin, Ralph R.

436

Incorporating field wind data into FIRETEC simulations of the International Crown Fire  

E-Print Network [OSTI]

Incorporating field wind data into FIRETEC simulations of the International Crown Fire Modeling frequency of the measured data, and the changes to local winds that might be caused by the experimental configuration. Twenty FIRETEC simulations of International Crown Fire Modeling Experiment (ICFME) plot 1

437

Dependence of effective internal field of congruent lithium niobate on its domain configuration and stability  

SciTech Connect (OSTI)

Congruent lithium niobate is characterized by its internal field, which arises due to defect clusters within the crystal. Here, it is shown experimentally that this internal field is a function of the molecular configuration in a particular domain and also on the stability of that particular configuration. The measurements of internal field are done using interferometric technique, while the variation of domain configuration is brought about by room temperature high voltage electric field poling.

Das, Ranjit, E-mail: ranjitdas.in@gmail.com, E-mail: souvik2cat@gmail.com, E-mail: srirajib@yahoo.com; Ghosh, Souvik, E-mail: ranjitdas.in@gmail.com, E-mail: souvik2cat@gmail.com, E-mail: srirajib@yahoo.com; Chakraborty, Rajib, E-mail: ranjitdas.in@gmail.com, E-mail: souvik2cat@gmail.com, E-mail: srirajib@yahoo.com [Department of Applied Optics and Photonics, University of Calcutta, JD-2, Sector III, Salt Lake, Kolkata 700098 (India)

2014-06-28T23:59:59.000Z

438

Quasi-experimental and experimental approaches to environmental economics  

E-Print Network [OSTI]

This paper argues that an increased application of quasi-experimental and experimental techniques will improve understanding about core environmental economics questions. This argument is supported by a review of the ...

Greenstone, Michael

439

Quasi-experimental and experimental approaches to environmental economics  

E-Print Network [OSTI]

This paper argues that an increased application of quasi-experimental and experimental techniques will improve understanding about core environmental economics questions. This argument is supported by a review of the ...

Greenstone, Michael

2007-01-01T23:59:59.000Z

440

f(?) curves: Experimental results  

Science Journals Connector (OSTI)

We study the transition to chaos at the golden and silver means for forced Rayleigh-Bénard (RB) convection in mercury. We present f(?) curves below, at, and above the transition, and provide comparisons to the curves calculated for the one-dimensional circle map. We find good agreement at both the golden and silver means. This confirms our earlier observation that for low amplitude forcing, forced RB convection is well described by the one-dimensional circle map and indicates that the f(?) curve is a good measure of the approach to criticality. For selected subcritical experimental data sets we calculate the degree of subcriticality. We also present both experimental and calculated results for f(?) in the presence of a third frequency. Again we obtain agreement: The presence of random noise or a third frequency narrows the right-hand (negative q) side of the f(?) curve. Subcriticality results in symmetrically narrowed curves. We can also distinguish these cases by examining the power spectra and Poincaré sections of the time series.

James A. Glazier; Gemunu Gunaratne; Albert Libchaber

1988-01-15T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


441

International Health Global Health Policy--------------------------------------------------------------------------------------  

E-Print Network [OSTI]

50 International Health Global Health Policy-------------------------------------------------------------------------------------- http://www.ghp.m.u-tokyo.ac.jp Our mission is to improve population health by enhancing accountability and improving evidence base of global (both domestic and international) health programmes through the provision

Miyashita, Yasushi

442

International Relations and Development Studies  

E-Print Network [OSTI]

& Anthropology and Languages (choice of French, Arabic, German, Italian or Spanish) The International Relations Economy, Languages (French, Spanish, Arabic, German, Italian), International Trade, Middle East Politics experience a broad range of opportunities outside the classroom: - Explore exchange opportunities with dozens

443

International migration within Latin America  

E-Print Network [OSTI]

International migration within Latin America ·Mostly labor circulation flows ·Industrial and urban;Example of International migration: Mexicans to US ·1920s revolution and post- revolution chaos in Mexico

Lopez-Carr, David

444

Internal structure, hygroscopic and reactive properties of mixed sodium  

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

Internal structure, hygroscopic and Internal structure, hygroscopic and reactive properties of mixed sodium methanesulfonate-sodium chloride particles Internal structure, hygroscopic and reactive properties of mixed sodium methanesulfonate-sodium chloride particles Print Friday, 13 May 2011 00:00 Scientists recently combined experimental approaches and molecular dynamics modeling to gain new insights into the internal structure of sea salt particles and relate it to their fundamental chemical reactivity in the atmosphere. This research shows that surface enhancement or depletion of chemical components in marine particles can occur because of the difference in the chemical nature of the species. Because the atmospheric chemistry of the salt particles takes place at the gas-particle interface, understanding their complex surfaces provides new insights about their effect on the environment and climate change. Article Link.

445

Brussels advocates a lone rider for ITER 09/22/2004 Edition  

E-Print Network [OSTI]

can advance alone to establish the thermonuclear reactor experimental ITER in Cadarache. France in the construction of the future experimental thermonuclear reactor ITER, if Brussels does not manage to convince

446

International Energy Outlook 2007  

Gasoline and Diesel Fuel Update (EIA)

7 7 (IEO2007) presents an assessment by the Energy Information Admin- istration (EIA) of the outlook for international energy markets through 2030. U.S. projections appearing in IEO2007 are consistent with those published in EIA's Annual Energy Outlook 2007 (AEO2007), which was pre- pared using the National Energy Modeling System (NEMS). IEO2007 is provided as a service to energy managers and analysts, both in government and in the private sector. The projections are used by international agencies, Federal and State governments, trade associa- tions, and other planners and decisionmakers. They are published pursuant to the Department of Energy Orga- nization Act of 1977 (Public Law 95-91), Section 205(c). Projections in IEO2007 are divided according to Organi- zation for Economic Cooperation and Development members (OECD) and non-members (non-OECD). There are

447

International Energy Outlook 1997  

Gasoline and Diesel Fuel Update (EIA)

7) 7) Distribution Category UC-950 International Energy Outlook 1997 April 1997 Energy Information Administration Office of Integrated Analysis and Forecasting U.S. Department of Energy Washington, DC 20585 This report was prepared by the Energy Information Administration, the independent statistical and analytical agency within the Department of Energy. The information contained herein should not be construed as advocating or reflecting any policy position of the Department of Energy or of any other organization. Contacts The International Energy Outlook is prepared by the Energy Information Administration (EIA). General questions concerning the contents of the report should be referred to Mary J. Hutzler (202/586-2222), Director, Office of Integrated Analysis and Forecasting; Arthur T. Andersen (202/586-1441), Director, Energy Demand and Integration Division;

448

International Energy Outlook 2006  

Gasoline and Diesel Fuel Update (EIA)

6 6 (IEO2006) presents an assessment by the Energy Information Administra- tion (EIA) of the outlook for international energy mar- kets through 2030. U.S. projections appearing in IEO2006 are consistent with those published in EIA's Annual Energy Outlook 2006 (AEO2006), which was pre- pared using the National Energy Modeling System (NEMS). IEO2006 is provided as a service to energy managers and analysts, both in government and in the private sector. The projections are used by international agencies, Federal and State governments, trade associa- tions, and other planners and decisionmakers. They are published pursuant to the Department of Energy Orga- nization Act of 1977 (Public Law 95-91), Section 205(c). IEO2006 focuses exclusively on marketed energy. Non- marketed energy sources, which continue to play an important role in some developing countries, are not included

449

International Energy Outlook 1995  

Gasoline and Diesel Fuel Update (EIA)

5) 5) Distribution Category UC-950 International Energy Outlook 1995 May 1995 Energy Information Administration Office of Integrated Analysis and Forecasting U.S. Department of Energy Washington, DC 20585 This report was prepared by the Energy Information Administration, the independent statistical and analytical agency within the Department of Energy. The information contained herein should not be construed as advocating or reflecting any policy position of the Department of Energy or of any other organization. Contacts The International Energy Outlook is prepared by the Energy Information Administration (EIA). General questions concerning the contents of the report should be referred to Mary J. Hutzler (202/586-2222), Director, Office of Integrated Analysis and Forecasting; Arthur T. Andersen (202/586-1441), Director, Energy Demand and Integration Division;

450

International Energy Outlook - Electicity  

Gasoline and Diesel Fuel Update (EIA)

Electricity Electricity International Energy Outlook 2004 Electricity Electricity consumption nearly doubles in the IEO2004 projections. Developing nations in Asia are expected to lead the increase in world electricity use. Figure 60. World Net Electricity Consumptin, 2001-2025. Need help, call the National Energy Information Center at 202-586-8800. Figure Data Figure 61. World Net Electricity Consumptin by Region, 2001-2025. Need help, call the National Energy Information Center at 202-586-8800. Figure Data World net electricity consumption is expected nearly double to over the next two decades, according to the International Energy Outlook 2004 (IEO2004) reference case forecast. Total demand for electricity is projected to increase on average by 2.3 percent per year, from 13,290

451

International Energy Outlook 1999  

Gasoline and Diesel Fuel Update (EIA)

contacts.gif (2957 bytes) contacts.gif (2957 bytes) The International Energy Outlook is prepared by the Energy Information Administration (EIA). General questions concerning the contents of the report should be referred to Mary J. Hutzler (202/586-2222), Director, Office of Integrated Analysis and Forecasting, or Arthur T. Andersen, Director, International, Economic, and Greenhouse Gases Division. Specific questions about the report should be referred to Linda E. Doman (202/586-1041) or the following analysts: Report Contact World Energy Consumption Linda E. Doman - 202/586-1041 linda.doman@eia.doe.gov World Oil Markets G. Daniel Butler - 202/586-9503 gbutler@eia.doe.gov Stacy MacIntyre - 202/586-9795- (Consumption) stacy.macintyre@eia.doe.gov Natural Gas Linda E. Doman - 202/586-1041

452

Internal Resources Home  

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

Budget Budget Proposals Human Resources Administration Internal Resources Administration--Includes an Administrative Services Directory and an A-Z index. Budget - Contacts Employee Talent Profile System--A system, launched by Jay Keasling in late 2012, populated with profiles of both scientists and non-scientists, meant to be a resource for the creation of teams across the Biosciences Area and the persue of collective funding opportunities both internal and external to the Laboratory. Complete your profile and look for more system enhancements in the coming year. Equipment List (viewable by Berkeley Lab staff only) -- A list of equipment used in the Life Sciences Division. Several equipment needs training prior to use, therefore, please always contact the person responsible if interested in using the equipment. If listed as a contact on

453

International Energy Outlook  

Gasoline and Diesel Fuel Update (EIA)

Contacts Contacts Contacts The International Energy Outlook is prepared by the Office of Integrated Analysis and Forecasting (OIAF). General questions concerning the contents of the report should be referred to John Conti, Director, International, Economic and Greenhouse Gases Division (202/586-4430). Specific questions about the report should be referred to Linda E. Doman (202/586-1041 or linda.doman@eia.doe.gov) or the following analysts: Macroeconomic Assumptions Nasir Khilji (nasir.khilji@eia.doe.gov, 202/586-1294) World Oil Markets G. Daniel Butler (george.butler@eia.doe.gov, 202/586-9503) Natural Gas Phyllis Martin (phyllis.martin@eia.doe.gov, 202/586-9592) Justine Bardin (justine.baren@eia.doe.gov 202/586-3508) Coal Michael Mellish (michael.mellish@eia.doe.gov,

454

International Energy Outlook 1998  

Gasoline and Diesel Fuel Update (EIA)

Contacts Contacts The International Energy Outlook is prepared by the Energy Information Administration (EIA). General questions concerning the contents of the report should be referred to Mary J. Hutzler (202/586-2222), Director, Office of Integrated Analysis and Forecasting, or Arthur T. Andersen (202/586-1441), Director, International, Economic, and Greenhouse Gases Division. Specific questions about the report should be referred toLinda E. Doman (202/586-1041) or the following analysts: World Energy Consumption Arthur Andersen (art.andersen@eia.doe.gov, 202/586-1441) Linda E. Doman (linda.doman@eia.doe.gov, 202/586-1041) World Oil Markets G. Daniel Butler (george.butler@eia.doe.gov, 202/586-9503) Perry Lindstrom (perry.lindstrom@eia.doe.gov, 202/586-0934) Reformulated Gasoline

455

International Nuclear Security  

SciTech Connect (OSTI)

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

Doyle, James E. [Los Alamos National Laboratory

2012-08-14T23:59:59.000Z

456

International energy outlook 2006  

SciTech Connect (OSTI)

This report presents international energy projections through 2030, prepared by the Energy Information Administration. After a chapter entitled 'Highlights', the report begins with a review of world energy and economic outlook, followed by energy consumption by end-use sector. The next chapter is on world oil markets. Natural gas, world coal market and electricity consumption and supply are then discussed. The final chapter covers energy-related carbon dioxide emissions.

NONE

2006-06-15T23:59:59.000Z

457

Polarized internal target apparatus  

DOE Patents [OSTI]

A polarized internal target apparatus with a polarized gas target of improved polarization and density (achieved by mixing target gas atoms with a small amount of alkali metal gas atoms, and passing a high intensity polarized light source into the mixture to cause the alkali metal gas atoms to become polarized which interact in spin exchange collisions with target gas atoms yielding polarized target gas atoms) is described.

Holt, R.J.

1984-10-10T23:59:59.000Z

458

International petroleum statistics report  

SciTech Connect (OSTI)

This report presents data on international oil production, demand, imports, exports, and stocks. Section 1 contains time series data on world oil production, and on oil demand and stocks in the OECD. Section 2 presents an oil supply/demand balance for the world, presented in quarterly intervals for the most recent two years. Section 3 presents data on oil imports by OECD countries. Section 4 presents annual time series data on world oil production, oil stocks, demand, and trade in OECD countries.

Not Available

1994-06-01T23:59:59.000Z

459

International petroleum statistics report  

SciTech Connect (OSTI)

This document is a monthly publication which provides current data on international oil production,demand,imports and stocks. This report has four sections which contain time series data on world oil production and oil demand and stocks in the Organization for Economic Cooperation and Development (OECD). Also included is oil supply/demand balance information for the world, and data on oil imports and trade by OECD countries.

NONE

1997-11-01T23:59:59.000Z

460

Polarized internal target apparatus  

DOE Patents [OSTI]

A polarized internal target apparatus with a polarized gas target of improved polarization and density achieved by mixing target gas atoms with a small amount of alkali metal gas atoms, and passing a high intensity polarized light source into the mixture to cause the alkali metal gas atoms to become polarized which interact in spin exchange collisions with target gas atoms yielding polarized target gas atoms.

Holt, Roy J. (Downers Grove, IL)

1986-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" 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.


461

International markets for CCTs  

SciTech Connect (OSTI)

The paper begins by describing the role of the International Energy Agency, the importance of coal, what the IEA is doing in the area of clean coal technology, and the role of the IEA Coal Industry Advisory Board. The paper then discusses which coal technologies will be chosen, what the problem areas are, and what can be done to accelerate the take-up of clean coal technologies.

Ferriter, J.P. [International Energy Agency, Paris (France)

1997-12-31T23:59:59.000Z

462

Hanford internal dosimetry program manual  

SciTech Connect (OSTI)

This document describes the Hanford Internal Dosimetry program. Program Services include administrating the bioassay monitoring program, evaluating and documenting assessments of internal exposure and dose, ensuring that analytical laboratories conform to requirements, selecting and applying appropriate models and procedures for evaluating internal radionuclide deposition and the resulting dose, and technically guiding and supporting Hanford contractors in matters regarding internal dosimetry. 13 refs., 16 figs., 42 tabs.

Carbaugh, E.H.; Sula, M.J.; Bihl, D.E.; Aldridge, T.L.

1989-10-01T23:59:59.000Z

463

Future Experimental Programs  

E-Print Network [OSTI]

I was asked to discuss future experimental programs even though I'm a theorist. As a result, I present my own personal views on where the field is, and where it is going, based on what I myself have been working on. In particular, I discuss why we need expeditions into high energies to find clues to where the relevant energy scale is for dark matter, baryon asymmetry, and neutrino mass. I also argue that the next energy frontier machine should be justified on the basis of what we know, namely the mass of the Higgs boson, so that we will learn what energy we should aim at once we nail the Higgs sector. Finally I make remarks on dark energy.

Hitoshi Murayama

2014-01-06T23:59:59.000Z

464

International petroleum statistics report  

SciTech Connect (OSTI)

The International Petroleum Statistics Report is a monthly publication that provides current international data. The report presents data on international oil production, demand, imports, and stocks. The report has four sections. Section 1 contains time series data on world oil production, and on oil demand and stocks in the Organization for Economic Cooperation and Development (OECD). This section contains annual data beginning in 1985, and monthly data for the most recent two years. Section 2 presents an oil supply/demand balance for the world. This balance is presented in quarterly intervals for the most recent two years. Section 3 presents data on oil imports by OECD countries. This section contains annual data for the most recent year, quarterly data for the most recent two quarters, and monthly data for the most recent 12 months. Section 4 presents annual time series data on world oil production and oil stocks, demand, and trade in OECD countries. World oil production and OECD demand data are for the years 1970 through 1996; OECD stocks from 1973 through 1996; and OECD trade from 1986 through 1996.

NONE

1997-07-01T23:59:59.000Z

465

International Finance and Climate Change  

E-Print Network [OSTI]

International Finance and Climate Change Thursday, October 17, 2013 Breakfast ­ 8:30 a Principal Climate Change Specialist, Climate Business Group at International Finance Corporation, World Bank Group Vladimir Stenek Senior Climate Change Specialist, Climate Business Department of the International

Zhang, Junshan

466

MENTAL HEALTH and INTERNATIONAL STUDENTS  

E-Print Network [OSTI]

MENTAL HEALTH and INTERNATIONAL STUDENTS: What Educators Need to Know Ingle International cares not adequately researched, it is well accepted by health care professionals that early intervention could about you and your students www.studyinsured.com #12;www.studyinsured.comMental Health and International

467

Third International Congress on Glass  

Science Journals Connector (OSTI)

... THE Third International Congress on Glass was held in Venice during June 29-July 2, associated with the International Commission ... was held in Venice during June 29-July 2, associated with the International Commission on Glass, the annual meeting of which was held on July 3. 179 delegates attended from ...

1953-08-15T23:59:59.000Z

468

International Phenomenological Society On Nominalism  

E-Print Network [OSTI]

International Phenomenological Society On Nominalism Author(s): Geoffrey Hellman Source: Philosophy and Phenomenological Research, Vol. 62, No. 3 (May, 2001), pp. 691-705 Published by: International Phenomenological contact support@jstor.org. . International Phenomenological Society is collaborating with JSTOR

Hellman, Geoffrey

469

International Electricity Trade - Open Access | Department of...  

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

International Electricity Trade - Open Access International Electricity Trade - Open Access DOE has consistently expressed its policy that international electricity trade should be...

470

International Fuel Services and Commercial Engagement | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

International Fuel Services and Commercial Engagement International Fuel Services and Commercial Engagement The Office of International Nuclear Energy Policy and Cooperation...

471

LETTERS  

Science Journals Connector (OSTI)

The experimental results with the toroidal octupole constitute a significant advance in the problem of Controlled Thermonuclear Fusion. ...

1967-07-03T23:59:59.000Z

472

Office of International Health Studies  

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

International Health Studies International Health Studies Home Mission and Functions Japan Radiation Effects Research Foundation (RERF) Studies Marshall Islands Program Russian Health Studies Program Russian Radiobiology Human Tissue Repository Spain (Palomares) Program Health and Safety HSS Logo Office of International Health Studies Reports to the Office of Health and Safety Mission and Functions Mission The Office of International Health Studies engages in the conduct of international scientific studies that may provide new knowledge and information about the human response to ionizing radiation in the workplace or people exposed in communities as a result of nuclear accidents. The mission includes providing health and environmental monitoring services to populations specified by law.

473

International Truck | Open Energy Information  

Open Energy Info (EERE)

Truck Truck Jump to: navigation, search Name International Truck Place Atlanta, GA Website http://www.internationaltruck. References International Truck[1] Information About Partnership with NREL Partnership with NREL Yes Partnership Type Other Relationship Partnering Center within NREL Transportation Technologies and Systems Partnership Year 2007 LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! International Truck is a company located in Atlanta, GA. References ↑ "International Truck" Retrieved from "http://en.openei.org/w/index.php?title=International_Truck&oldid=381698" Categories: Clean Energy Organizations Companies Organizations What links here Related changes Special pages Printable version Permanent link

474

International | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

International | National Nuclear Security Administration International | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog International Home > About Us > Our Programs > Nuclear Security > Nuclear Materials Management & Safeguards System > International International U.S. Department of Energy / U.S. Nuclear Regulatory Commission

475

Experimental Particle Physics  

SciTech Connect (OSTI)

The high energy physics group at the University of South Carolina, under the leadership of Profs. S.R. Mishra, R. Petti, M.V. Purohit, J.R. Wilson (co-PI's), and C. Rosenfeld (PI), engaged in studies in "Experimental Particle Physics." The group collaborated with similar groups at other universities and at national laboratories to conduct experimental studies of elementary particle properties. We utilized the particle accelerators at the Fermi National Accelerator Laboratory (Fermilab) in Illinois, the Stanford Linear Accelerator Center (SLAC) in California, and the European Center for Nuclear Research (CERN) in Switzerland. Mishra, Rosenfeld, and Petti worked predominantly on neutrino experiments. Experiments conducted in the last fifteen years that used cosmic rays and the core of the sun as a source of neutrinos showed conclusively that, contrary to the former conventional wisdom, the "flavor" of a neutrino is not immutable. A neutrino of flavor "e," "mu," or "tau," as determined from its provenance, may swap its identity with one of the other flavors -- in our jargon, they "oscillate." The oscillation phenomenon is extraordinarily difficult to study because neutrino interactions with our instruments are exceedingly rare -- they travel through the earth mostly unimpeded -- and because they must travel great distances before a substantial proportion have made the identity swap. Three of the experiments that we worked on, MINOS, NOvA, and LBNE utilize a beam of neutrinos from an accelerator at Fermilab to determine the parameters governing the oscillation. Two other experiments that we worked on, NOMAD and MIPP, provide measurements supportive of the oscillation experiments. Good measurements of the neutrino oscillation parameters may constitute a "low energy window" on related phenomena that are otherwise unobservable because they would occur only at energies way above the reach of conceivable accelerators. Purohit and Wilson participated in the BaBar experiment, which collected data at SLAC until 2008. They continued to analyze the voluminous BaBar data with an emphasis on precision tests of Quantum Chromodynamics and on properties of the "eta_B," a bottom quark paired in a meson with a strange quark. The ATLAS experiment became the principal research focus for Purohit. One of the world's largest pieces of scientific equipment, ATLAS observes particle collisions at the highest-energy particle accelerator ever built, the Large Hadron Collider (LHC) at CERN. Our efforts on ATLAS included participation in the commissioning, calibration, and installation of components called "CSCs". The unprecedented energy of 14 TeV enabled the ATLAS and CMS collaborations to declare discovery of the famous Higgs particle in 2012.

Rosenfeld, Carl [Univ of South Carolina] (ORCID:0000000338571223); Mishra, Sanjib R. [Univ of South Carolina; Petti, Roberto [Univ of South Carolina; Purohit, Milind V. [Univ of South Carolina

2014-08-31T23:59:59.000Z

476

Experimental and theoretical research in applied plasma physics  

SciTech Connect (OSTI)

This report discusses research in the following areas: fusion theory and computations; theory of thermonuclear plasmas; user service center; high poloidal beta studies on PBX-M; fast ECE fluctuation diagnostic for balloning mode studies; x-ray imaging diagnostic; millimeter/submillimeter-wave fusion ion diagnostics; small scale turbulence and nonlinear dynamics in plasmas; plasma turbulence and transport; phase contrast interferometer diagnostic for long wavelength fluctuations in DIII-D; and charged and neutral fusion production for fusio plasmas.

Porkolab, M.

1992-01-01T23:59:59.000Z

477

Electron fishbones: Theory and experimental evidence  

E-Print Network [OSTI]

We discuss the processes underlying the excitation of fishbone-like internal kink instabilities driven by supra-thermal electrons generated experimentally by different means: Electron Cyclotron Resonance Heating (ECRH) and by Lower Hybrid (LH) power injection. The peculiarity and interest of exciting these electron fishbones by ECRH only or by LH only is also analyzed. Not only the mode stability is explained, but also the transition between steady state nonlinear oscillations to bursting (almost regular) pulsations, as observed in FTU, is interpreted in terms of the LH power input. These results are directly relevant to the investigation of trapped alpha particle interactions with low-frequency MHD modes in burning plasmas: in fact, alpha particles in reactor relevant conditions are characterized by small dimensionless orbits, similarly to electrons; the trapped particle bounce averaged dynamics, meanwhile, depends on energy and not mass.

Zonca, F; Cardinali, A; Chen, L; Dong, J -Q; Long, Y -X; Milovanov, A V; Romanelli, F; Smeulders, P; Wang, L; Wang, Z -T; Castaldo, C; Cesario, R; Giovannozzi, E; Marinucci, M; Ridolfini, V Pericoli

2007-01-01T23:59:59.000Z

478

International Team | Department of Energy  

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

International Team International Team International Team The Office of Energy Efficiency and Renewable Energy's (EERE's) International Team advances the progress of EERE's domestic programs and accelerates global deployment of U.S. clean energy products and services through international collaboration. To realize the benefits of international collaboration, we coordinate with other offices in the U.S. Department of Energy and U.S. government agencies to identify, negotiate and actively manage targeted partnerships and projects that help advance our strategic goals. The collaborative research we support is either in the "pre-competitive" space or includes intellectual property issues that have been agreed upon in advance. All funds support U.S.-based project performers or international organizations

479

International Programs | Department of Energy  

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

International Programs International Programs International Programs The Office of Environmental Management (EM) International Program seeks out international technical experts to support EM's mission of accelerated risk reduction and cleanup of the environmental legacy of the nation's nuclear weapons program and government-sponsored nuclear energy research. To achieve this, EM pursues collaborations with foreign government organizations, educational institutions, and private industry to identify technologies that can address the site cleanup needs of the U.S. Department of Energy. The EM International Program currently works with the Russian Federation and Ukraine through cooperative bilateral arrangements to support EM's accelerated cleanup and closure mission. The EM International Program is also currently evaluating the potential benefits

480

INTERNAL REPAIR OF PIPELINES  

SciTech Connect (OSTI)

The two broad categories of deposited weld metal repair and fiber-reinforced composite liner repair technologies were reviewed for potential application for internal repair of gas transmission pipelines. Both are used to some extent for other applications and could be further developed for internal, local, structural repair of gas transmission pipelines. Preliminary test programs were developed for both deposited weld metal repair and for fiber-reinforced composite liner repair. Evaluation trials have been conducted using a modified fiber-reinforced composite liner provided by RolaTube and pipe sections without liners. All pipe section specimens failed in areas of simulated damage. Pipe sections containing fiber-reinforced composite liners failed at pressures marginally greater than the pipe sections without liners. The next step is to evaluate a liner material with a modulus of elasticity approximately 95% of the modulus of elasticity for steel. Preliminary welding parameters were developed for deposited weld metal repair in preparation of the receipt of Pacific Gas & Electric's internal pipeline welding repair system (that was designed specifically for 559 mm (22 in.) diameter pipe) and the receipt of 559 mm (22 in.) pipe sections from Panhandle Eastern. The next steps are to transfer welding parameters to the PG&E system and to pressure test repaired pipe sections to failure. A survey of pipeline operators was conducted to better understand the needs and performance requirements of the natural gas transmission industry regarding internal repair. Completed surveys contained the following principal conclusions: (1) Use of internal weld repair is most attractive for river crossings, under other bodies of water, in difficult soil conditions, under highways, under congested intersections, and under railway crossings. (2) Internal pipe repair offers a strong potential advantage to the high cost of horizontal direct drilling (HDD) when a new bore must be created to solve a leak or other problem. (3) Typical travel distances can be divided into three distinct groups: up to 305 m (1,000 ft.); between 305 m and 610 m (1,000 ft. and 2,000 ft.); and beyond 914 m (3,000 ft.). All three groups require pig-based systems. A despooled umbilical system would suffice for the first two groups which represents 81% of survey respondents. The third group would require an onboard self-contained power unit for propulsion and welding/liner repair energy needs. (4) Pipe diameter sizes range from 50.8 mm (2 in.) through 1,219.2 mm (48 in.). The most common size range for 80% to 90% of operators surveyed is 508 mm to 762 mm (20 in. to 30 in.), with 95% using 558.8 mm (22 in.) pipe. An evaluation of potential repair methods clearly indicates that the project should continue to focus on the development of a repair process involving the use of GMAW welding and on the development of a repair process involving the use of fiber-reinforced composite liners.

Robin Gordon; Bill Bruce; Ian Harris; Dennis Harwig; Nancy Porter; Mike Sullivan; Chris Neary

2004-04-12T23:59:59.000Z

Note: This page contains sample records for the topic "international thermonuclear experimental" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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481

Internal absorber solar collector  

DOE Patents [OSTI]

Thin solar collecting panels are described made from arrays of small rod collectors consisting of a refracting dielectric rod lens with an absorber imbedded within it and a reflecting mirror coated on the back side of the dielectric rod. Non-tracking collector panels on vertical walls or roof tops receive approximately 90% of solar radiation within an acceptance zone 60.degree. in elevation angle by 120.degree. or more in the azimuth sectors with a collector concentration ratio of approximately 3.0. Miniaturized construction of the circular dielectric rods with internal absorbers reduces the weight per area of glass, plastic and metal used in the collector panels. No external parts or insulation are needed as heat losses are low due to partial vacuum or low conductivity gas surrounding heated portions of the collector. The miniature internal absorbers are generally made of solid copper with black selective surface and the collected solar heat is extracted at the collector ends by thermal conductivity along the absorber rods. Heat is removed from end fittings by use of liquid circulants. Several alternate constructions are provided for simplifying collector panel fabrication and for preventing the thermal expansion and contraction of the heated absorber or circulant tubes from damaging vacuum seals. In a modified version of the internal absorber collector, oil with temperature dependent viscosity is pumped through a segmented absorber which is now composed of closely spaced insulated metal tubes. In this way the circulant is automatically diverted through heated portions of the absorber giving higher collector concentration ratios than theoretically possible for an unsegmented absorber.

Sletten, Carlyle J. (106 Nagog Hill Rd., Acton, MA 01720); Herskovitz, Sheldon B. (88 Hammond St., Acton, MA 01720); Holt, F. S. (46 Emerson Rd., Winchester, MA 01890); Sletten, E. J. (Chestnut Hill Rd. R.F.D. Rte. #4, Amherst, NH 03031)

1981-01-01T23:59:59.000Z

482

Plasma and the Controlled Thermonuclear Reaction  

Science Journals Connector (OSTI)

...The gas heated by the neutrons passes through a gas turbine (5) where it adiabatically ex-pands. Next it...connecting the container of the reactor with the gas turbine; 5, gas turbine; 6, isothermal compressor; 7, cooling water...

P. L. Kapitza

1979-09-07T23:59:59.000Z

483

Spectropolarimetric diagnostics of thermonuclear supernova explosions  

E-Print Network [OSTI]

Even at extragalactic distances, the shape of supernova ejecta can be effectively diagnosed by spectropolarimetry. We present here results for 17 Type Ia supernovae that allow a statistical study of the correlation among the geometric structures and other observable parameters of Type Ia supernovae. These observations suggest that their ejecta typically consist of a smooth, central iron rich core and an outer layer with chemical asymmetries. The degree of this peripheral asphericity is correlated with the light-curve decline rate of Type Ia supernovae. These observations lend strong support to delayed-detonation models of Type Ia supernovae.

Lifan Wang; Dietrich Baade; Ferdinando Patat

2006-11-29T23:59:59.000Z

484

Thermonuclear Fusion in a Staged Pinch  

Science Journals Connector (OSTI)

Staged pinch implosions provide means to couple energy to a small-diameter fibre on an extremely fast time scale, circumventing the limitations of conventional pinches. In this scheme the generator current initia...

F. J. Wessel; Norman Rostoker; H. U. Rahman…

1997-01-01T23:59:59.000Z

485

Do spherical tokamaks have a thermonuclear future?  

Science Journals Connector (OSTI)

This work has been initiated by the publication of a review by B.V.Kuteev et al., “Intense Fusion Neutron Sources” [Plasma Physics Reports 36..., 281 (2010)]. It is stated that the key thesis of the above review ...

S. V. Mirnov

2012-12-01T23:59:59.000Z

486

Analytical study of thermonuclear reaction probability integrals  

Science Journals Connector (OSTI)

An analytic study of the reaction probability integralscorresponding to the various forms of the slowly varyingcross-section factor S(E) is attempted. Exact expressions forreaction probability integrals are expre...

M.Aslam Chaudhry; H.J. Haubold; A.M. Mathai

2000-09-01T23:59:59.000Z

487

Deflagrations and Detonations in Thermonuclear Supernovae  

E-Print Network [OSTI]

We study a type Ia supernova explosion using three-dimensional numerical simulations based on reactive fluid dynamics. We consider a delayed-detonation model that assumes a deflagration-to-detonation transition. In contrast to the pure deflagration model, the delayed-detonation model releases enough energy to account for a healthy explosion, and does not leave carbon, oxygen, and intermediate-mass elements in central parts of a white dwarf. This removes the key disagreement between simulations and observations, and makes a delayed detonation the mostly likely mechanism for type Ia supernovae.

Vadim N. Gamezo; Alexei M. Khokhlov; Elaine S. Oran

2004-06-03T23:59:59.000Z

488

Dynamic Screening and Thermonuclear Reaction Rates  

E-Print Network [OSTI]

We show that there are no dynamic screening corrections to the Salpeter's enhancement factor in the weak-screening limit.

Andrei V. Gruzinov

1997-02-06T23:59:59.000Z

489

Analytical Study of Thermonuclear Reaction Probability Integrals  

E-Print Network [OSTI]

An analytic study of the reaction probability integrals corresponding to the various forms of the slowly varying cross-section factor $S(E)$ is attempted. Exact expressions for reaction probability integrals are expressed in terms of the extended gamma functions.

M. A. Chaudhry; H. J. Haubold; A. M. Mathai

2000-01-16T23:59:59.000Z

490

The late emission of thermonuclear supernovae  

E-Print Network [OSTI]

The subject of late-time emission of Type Ia supernovae and its implications for the understanding of the explosions of C+O WDs is reviewed.

Pilar Ruiz-Lapuente

1996-04-16T23:59:59.000Z

491

International Energy Outlook 1998  

Gasoline and Diesel Fuel Update (EIA)

B B World Energy Projection System The projections of world energy consumption published annually by the Energy Information Administration (EIA) in the International Energy Outlook (IEO) are derived from the World Energy Projection System (WEPS). WEPS is an integrated set of personal-computer-based spreadsheets containing data compilations, assumption specifications, descriptive analysis procedures, and projection models. The WEPS accounting framework incorporates projections from independently documented models and assumptions about the future energy intensity of economic activity (ratios of total energy consumption divided by gross domestic product [GDP]) and about the rate of incremental energy requirements met by natural gas, coal, and renewable energy sources (hydroelectricity, geothermal, solar, wind, biomass, and

492

International petroleum statistics report  

SciTech Connect (OSTI)

This monthly publication provides international oil data for January 1998. The report presents data on oil production, demand, imports, and stocks in four sections. Section 1 containes time series data on world oil production, and on oil demand and stocks in the Organization for Economic Cooperation and Development (OECD). Section 2 presents an oil supply/demand balance for the world. This balance is presented in quarterly intervals for the most recent two years. section 3 presents data on oil imports by OECD countries. Section 4 containes annual time series data on world oil production and oil stocks, demand, and trade in OECD countries.

NONE

1998-01-01T23:59:59.000Z

493

International energy annual, 1993  

SciTech Connect (OSTI)

This document presents an overview of key international energy trends for production, consumption, imports, and exports of primary energy commodities in over 200 countries, dependencies, and areas of special sovereignty. Also included are population and gross domestic product data, as well as prices for crude oil and petroleum products in selected countries. Renewable energy includes hydroelectric, geothermal, solar and wind electric power and alcohol for fuel. The data were largely derived from published sources and reports from US Embassy personnel in foreign posts. EIA also used data from reputable secondary sources, industry reports, etc.

NONE

1995-05-08T23:59:59.000Z

494

Metered Mail Form International Mail Only  

E-Print Network [OSTI]

Metered Mail Form International Mail Only Charge to Department USPS First Class Mail International International Metered Mail Form and must be kept separate from all other domestic mail. · International mail

Palmeri, Thomas

495

2010 International SWAT Conference Proceedings Conference Proceedings  

E-Print Network [OSTI]

2010 International SWAT Conference Proceedings Conference Proceedings #12;#12;Conference ProceedingsConference Proceedings #12;#12;2010 International SWAT Conference Proceedings Contents Conference-490 #12;2010 International SWAT Conference Proceedings 2010 International SWAT Conference Proceedings

496

Nanoparticle Emissions from Internal Combustion Engines | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Nanoparticle Emissions from Internal Combustion Engines Nanoparticle Emissions from Internal Combustion Engines 2004 Diesel Engine Emissions Reduction (DEER) Conference...

497

Upcoming Webinar December 16: International Hydrogen Infrastructure...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Upcoming Webinar December 16: International Hydrogen Infrastructure Challenges NOW, DOE, and NEDO Upcoming Webinar December 16: International Hydrogen Infrastructure Challenges...

498

Florida International University Science and Technology Workforce...  

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

About Us Jobs & Internships Florida International University Science and Technology Workforce Development Program Florida International University Science and Technology...

499

Interested Parties - Organization for International Investment...  

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

Organization for International Investment Interested Parties - Organization for International Investment PI.pdf More Documents & Publications Interested Parties - Morgan Wright...

500

International Hydrogen Infrastructure Challenges Workshop Summary...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

International Hydrogen Infrastructure Challenges Workshop Summary - NOW, NEDO, and DOE International Hydrogen Infrastructure Challenges Workshop Summary - NOW, NEDO, and DOE...