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1

National Spherical Torus Experiment (NSTX) | Princeton Plasma...  

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2

Control System Development Plan for the National Spherical Torus Experiment  

SciTech Connect

The National Spherical Torus Experiment (NSTX) has as one of its primary goals the demonstration of the attractiveness of the spherical torus concept as a fusion power plant. Central to this goal is the achievement of high plasma {beta} ( = 2{micro}{sub 0}

/B{sup 2} a measure of the efficiency of a magnetic plasma confinement system). It has been demonstrated both theoretically and experimentally that the maximum achievable {beta} is a strong function of both local and global plasma parameters. It is therefore important to optimize control of the plasma. To this end a phased development plan for digital plasma control on NSTX is presented. The relative level of sophistication of the control system software and hardware will be increased according to the demands of the experimental program in a three phase plan. During Day 0 (first plasma), a simple coil current control algorithm will initiate plasma operations. During the second phase (Day 1) of plasma operations the control system will continue to use the preprogrammed algorithm to initiate plasma breakdown but will then change over to a rudimentary plasma control scheme based on linear combinations of measured plasma fields and fluxes. The third phase of NSTX plasma control system development will utilize the rtEFIT code, first used on DIII-D, to determine, in real-time, the full plasma equilibrium by inverting the Grad-Shafranov equation. The details of the development plan, including a description of the proposed hardware will be presented.

C. Neumeyer; D. Mueller; D.A. Gates; J.R. Ferron

1999-06-01T23:59:59.000Z

3

Physics results from the National Spherical Torus Experiment  

SciTech Connect

The National Spherical Torus Experiment (NSTX) at the Princeton Plasma Physics Laboratory is designed for studying toroidal plasma confinement at very low aspect-ratio, A=R/a = 0.85m/0.68m {approximately} 1.25, with cross-section elongation up to 2.2 and triangularity up to 0.5, for plasma currents up to 1 MA and vacuum toroidal magnetic fields up to 0.6 T on axis. Conducting plates are installed close to the plasma on the outboard side to stabilize kink modes. This should permit operation with toroidal-{beta} approaching 40%. The plasmas will be heated by up to 6 MW High-Harmonic Fast Waves (HHFW) at a frequency 30 MHz and by 5 MW of 80 keV deuterium Neutral Beam Injection. Inductive plasma startup can be supplemented by the process of Coaxial Helicity Injection (CHI).

M.G. Bell

2000-06-13T23:59:59.000Z

4

Electron Bernstein Wave Research on the National Spherical Torus Experiment  

SciTech Connect

Off-axis electron Bernstein wave current drive (EBWCD) may be critical for sustaining noninductive high-beta National Spherical Torus Experiment (NSTX) plasmas. Numerical modeling results predict that the {approx}100 kA of off-axis current needed to stabilize a solenoid-free high-beta NSTX plasma could be generated via Ohkawa current drive with 3 MW of 28 GHz EBW power. In addition, synergy between EBWCD and bootstrap current may result in a 10% enhancement in current-drive efficiency with 4 MW of EBW power. Recent dual-polarization EBW radiometry measurements on NSTX confirm that efficient coupling to EBWs can be readily accomplished by launching elliptically polarized electromagnetic waves oblique to the confining magnetic field, in agreement with numerical modeling. Plans are being developed for implementing a 1 MW, 28 GHz proof-of-principle EBWCD system on NSTX to test the EBW coupling, heating and current-drive physics at high radio-frequency power densities.

G. Taylor; A. Bers; T.S. Bigelow; M.D. Carter; J.B. Caughman; J. Decker; S. Diem; P.C. Efthimion; N.M. Ershov; E. Fredd; R.W. Harvey; J. Hosea; F. Jaeger; J. Preinhaelter; A.K. Ram; D.A. Rasmussen; A.P. Smirnov; J.B. Wilgen; J.R. Wilson

2005-04-21T23:59:59.000Z

5

Spherical Torus Center Stack Design  

SciTech Connect

The low aspect ratio spherical torus (ST) configuration requires that the center stack design be optimized within a limited available space, using materials within their established allowables. This paper presents center stack design methods developed by the National Spherical Torus Experiment (NSTX) Project Team during the initial design of NSTX, and more recently for studies of a possible next-step ST (NSST) device.

C. Neumeyer; P. Heitzenroeder; C. Kessel; M. Ono; M. Peng; J. Schmidt; R. Woolley; I. Zatz

2002-01-18T23:59:59.000Z

6

Overview of Results from the National Spherical Torus Experiment (NSTX)  

SciTech Connect

The mission of NSTX is the demonstration of the physics basis required to extrapolate to the next steps for the spherical torus (ST), such as a plasma facing component test facility (NHTX) or an ST based component test facility (ST-CTF), and to support ITER. Key issues for the ST are transport, and steady state high {beta} operation. To better understand electron transport, a new high-k scattering diagnostic was used extensively to investigate electron gyro-scale fluctuations with varying electron temperature gradient scale-length. Results from n = 3 braking studies confirm the flow shear dependence of ion transport. New results from electron Bernstein wave emission measurements from plasmas with lithium wall coating applied indicate transmission efficiencies near 70% in H-mode as a result of reduced collisionality. Improved coupling of High Harmonic Fast-Waves has been achieved by reducing the edge density relative to the critical density for surface wave coupling. In order to achieve high bootstrap fraction, future ST designs envision running at very high elongation. Plasmas have been maintained on NSTX at very low internal inductance l{sub i} {approx} 0.4 with strong shaping ({kappa} {approx} 2.7, {delta} {approx} 0.8) with {beta}{sub N} approaching the with-wall beta limit for several energy confinement times. By operating at lower collisionality in this regime, NSTX has achieved record non-inductive current drive fraction f{sub NI} {approx} 71%. Instabilities driven by super-Alfvenic ions are an important issue for all burning plasmas, including ITER. Fast ions from NBI on NSTX are super-Alfvenic. Linear TAE thresholds and appreciable fast-ion loss during multi-mode bursts are measured and these results are compared to theory. RWM/RFA feedback combined with n = 3 error field control was used on NSTX to maintain plasma rotation with {beta} above the no-wall limit. The impact of n > 1 error fields on stability is a important result for ITER. Other highlights are: results of lithium coating experiments, momentum confinement studies, scrape-off layer width scaling, demonstration of divertor heat load mitigation in strongly shaped plasmas, and coupling of CHI plasmas to OH ramp-up. These results advance the ST towards next step fusion energy devices such as NHTX and ST-CTF.

Gates, D; Ahn, J; Allain, J; Andre, R; Bastasz, R; Bell, M; Bell, R; Belova, E; Berkery, J; Betti, R; Bialek, J; Biewer, T; Bigelow, T; Bitter, M; Boedo, J; Bonoli, P; Bozzer, A; Brennan, D; Breslau, J; Brower, D; Bush, C; Canik, J; Caravelli, G; Carter, M; Caughman, J; Chang, C; Choe, W; Crocker, N; Darrow, D; Delgado-Aparicio, L; Diem, S; D'Ippolito, D; Domier, C; Dorland, W; Efthimion, P; Ejiri, A; Ershov, N; Evans, T; Feibush, E; Fenstermacher, M; Ferron, J; Finkenthal, M; Foley, J; Frazin, R; Fredrickson, E; Fu, G; Funaba, H; Gerhardt, S; Glasser, A; Gorelenkov, N; Grisham, L; Hahm, T; Harvey, R; Hassanein, A; Heidbrink, W; Hill, K; Hillesheim, J; Hillis, D; Hirooka, Y; Hosea, J; Hu, B; Humphreys, D; Idehara, T; Indireshkumar, K; Ishida, A; Jaeger, F; Jarboe, T; Jardin, S; Jaworski, M; Ji, H; Jung, H; Kaita, R; Kallman, J; Katsuro-Hopkins, O; Kawahata, K; Kawamori, E; Kaye, S; Kessel, C; Kim, J; Kimura, H; Kolemen, E; Krasheninnikov, S; Krstic, P; Ku, S; Kubota, S; Kugel, H; La Haye, R; Lao, L; LeBlanc, B; Lee, W; Lee, K; Leuer, J; Levinton, F; Liang, Y; Liu, D; Luhmann, N; Maingi, R; Majeski, R; Manickam, J; Mansfield, D; Maqueda, R; Mazzucato, E; McCune, D; McGeehan, B; McKee, G; Medley, S; Menard, J; Menon, M; Meyer, H; Mikkelsen, D; Miloshevsky, G; Mitarai, O; Mueller, D; Mueller, S; Munsat, T; Myra, J; Nagayama, Y; Nelson, B; Nguyen, X; Nishino, N; Nishiura, M; Nygren, R; Ono, M; Osborne, T; Pacella, D; Park, H; Park, J; Paul, S; Peebles, W; Penaflor, B; Peng, M; Phillips, C; Pigarov, A; Podesta, M; Preinhaelter, J; Ram, A; Raman, R; Rasmussen, D; Redd, A; Reimerdes, H; Rewoldt, G; Ross, P; Rowley, C; Ruskov, E; Russell, D; Ruzic, D; Ryan, P; Sabbagh, S; Schaffer, M; Schuster, E; Scott, S; Shaing, K; Sharpe, P; Shevchenko, V; Shinohara, K; Sizyuk, V; Skinner, C; Smirnov, A; Smith, D; Smith, S; Snyder, P; Soloman, W; Sontag, A; Soukhanovskii, V; Stoltzfus-Dueck, T; Stotler, D; Strait, T; Stratton, B; Stutman, D; Takahashi, R; Takase, Y; Tamura, N; Tang, X; Taylor, G; Taylor, C; Ticos, C; Tritz, K; Tsarouhas, D; Turrnbull, A; Tynan, G; Ulrickson, M; Umansky, M; Urban, J; Utergberg, E; Walker, M; Wampler, W; Wang, J; Wang, W; Weland, A

2009-01-05T23:59:59.000Z

7

Spherical torus fusion reactor  

DOE Patents (OSTI)

A fusion reactor is provided having a near spherical-shaped plasma with a modest central opening through which straight segments of toroidal field coils extend that carry electrical current for generating a toroidal magnet plasma confinement fields. By retaining only the indispensable components inboard of the plasma torus, principally the cooled toroidal field conductors and in some cases a vacuum containment vessel wall, the fusion reactor features an exceptionally small aspect ratio (typically about 1.5), a naturally elongated plasma cross section without extensive field shaping, requires low strength magnetic containment fields, small size and high beta. These features combine to produce a spherical torus plasma in a unique physics regime which permits compact fusion at low field and modest cost.

Peng, Yueng-Kay M. (Oak Ridge, TN)

1989-01-01T23:59:59.000Z

8

Exploration of High Harmonic Fast Wave Heating on the National Spherical Torus Experiment  

SciTech Connect

High Harmonic Fast Wave (HHFW) heating has been proposed as a particularly attractive means for plasma heating and current drive in the high-beta plasmas that are achievable in spherical torus (ST) devices. The National Spherical Torus Experiment (NSTX) [Ono, M., Kaye, S.M., Neumeyer, S., et al., Proceedings, 18th IEEE/NPSS Symposium on Fusion Engineering, Albuquerque, 1999, (IEEE, Piscataway, NJ (1999), p. 53.)] is such a device. An radio-frequency (rf) heating system has been installed on NSTX to explore the physics of HHFW heating, current drive via rf waves and for use as a tool to demonstrate the attractiveness of the ST concept as a fusion device. To date, experiments have demonstrated many of the theoretical predictions for HHFW. In particular, strong wave absorption on electrons over a wide range of plasma parameters and wave parallel phase velocities, wave acceleration of energetic ions, and indications of current drive for directed wave spectra have been observed. In addition HHFW heating has been used to explore the energy transport properties of NSTX plasmas, to create H-mode (high-confinement mode) discharges with a large fraction of bootstrap current and to control the plasma current profile during the early stages of the discharge.

J.R. Wilson; R.E. Bell; S. Bernabei; M. Bitter; P. Bonoli; D. Gates; J. Hosea; B. LeBlanc; T.K. Mau; S. Medley; J. Menard; D. Mueller; M. Ono; C.K. Phillips; R.I. Pinsker; R. Raman; A. Rosenberg; P. Ryan; S. Sabbagh; D. Stutman; D. Swain; Y. Takase; J. Wilgen; the NSTX Team

2003-02-11T23:59:59.000Z

9

Progress towards Steady State at Low Aspect Ratio on the National Spherical Torus Experiment (NSTX)  

SciTech Connect

Modifications to the plasma control capabilities and poloidal field coils of the National Spherical Torus Experiment (NSTX) have enabled a significant enhancement in shaping capability which has led to the transient achievement of a record shape factor (S ? q95 (I?? ???)) of ?41 (MA m?1 ??1) simultaneous with a record plasma elongation of ? ? ? ? ? ? 3. This result was obtained using isoflux control and real-time equilibrium reconstruction. Achieving high shape factor together with tolerable divertor loading is an important result for future ST burning plasma experiments as exemplified by studies for future ST reactor concepts, as well as neutron producing devices, which rely on achieving high shape factors in order to achieve steady state operation while maintaining MHD stability. Statistical evidence is presented which demonstrates the expected correlation between increased shaping and improved plasma performance.

D.A. Gates, J. Menard, R. Maingi, S. Kaye, S.A. Sabbagh, S. Diem, J.R.Wilson, M.G. Bell, R.E. Bell, J. Ferron, E.D. Fredrickson, C.E. Kessel, B.P. LeBlanc, F. Levinton, J. Manickam, D. Mueller, R. Raman, T. Stevenson, D. Stutman, G. Taylor, K. Tritz, H. Yu, and the NSTX Research Team

2007-11-08T23:59:59.000Z

10

Scintillator Based Energetic Ion Loss Diagnostic for the National Spherical Torus Experiment  

Science Conference Proceedings (OSTI)

A scintillator based energetic ion loss detector has been built and installed on the National Spherical Torus Experiment (NSTX) to measure the loss of neutral beam ions. The detector is able to resolve the pitch angle and gyroradius of the lost energetic ions. It has a wide acceptance range in pitch angle and energy, and is able to resolve the full, one-half, and one-third energy components of the 80 keV D neutral beams up to the maximum toroidal magnetic field of NSTX. Multiple Faraday cups have been embedded behind the scintillator to allow easy absolute calibration of the diagnostic and to measure the energetic ion loss to several ranges of pitch angle with good time resolution. Several small, vacuum compatible lamps allow simple calibration of the scintillator position within the field of view of the diagnostic's video camera.

D.S. Darrow

2007-07-02T23:59:59.000Z

11

Spherical torus fusion reactor  

DOE Patents (OSTI)

The object of this invention is to provide a compact torus fusion reactor with dramatic simplification of plasma confinement design. Another object of this invention is to provide a compact torus fusion reactor with low magnetic field and small aspect ratio stable plasma confinement. In accordance with the principles of this invention there is provided a compact toroidal-type plasma confinement fusion reactor in which only the indispensable components inboard of a tokamak type of plasma confinement region, mainly a current conducting medium which carries electrical current for producing a toroidal magnet confinement field about the toroidal plasma region, are retained.

Martin Peng, Y.K.M.

1985-10-03T23:59:59.000Z

12

Dynamical Evolution of Pedestal Parameters in ELMy H-mode in the National Spherical Torus Experiment  

SciTech Connect

Characterizations of the pedestal parameter dynamics throughout the edge localized modes(ELM) cycles are performed on the National Spherical Torus Experiment (NSTX, [M. Ono et al., Nucl. Fusion 40, 557 (2000)]). A clear buildup of the pedestal height is observed between ELMs for three di erent plasma currents, which tends to saturate prior to the onset of ELM at low and medium plasma current. Similarly, the pedestal width increases with no clear evidence of saturation during an ELM cycle. The maximum pedestal gradient increases as a function of plasma current, reaches a nominal value after the ELM crash, and remains constant until the end of the ELM cycle. The pedestal height just prior to the onset of ELM is shown to increase quadratically with plasma current. The pedestal width ? is proportional to the square-root of the poloidal ? at the top of the pedestal. Coherent density uctuations strongly increasing at the plasma edge are observed to be maximum after the ELM crash and to decay during the rest of the ELM cycle. Finally, the pedestal parameters evolution during the ELM cycle as well as the scaling with Ip of the pedestal pressure prior to the onset ELM are found to be qualitatively consistent with the peeling ballooning theory.

Diallo, A; Kubota, S; Sontag, A; Osborne, T; Podesta, M; Bell, R E; LeBlanc, B P; Menard, J

2011-07-27T23:59:59.000Z

13

Physics Design of a 28 GHz Electron Heating System for the National Spherical Torus Experiment Upgrade  

SciTech Connect

A megawatt-level, 28 GHz electron heating system is being designed to support non-inductive (NI) plasma current (I{sub p}) start-up and local heating and current drive (CD) in H-mode discharges in the National Spherical Torus Experiment Upgrade (NSTX-U). The development of fully NI I{sub p} start-up and ramp-up is an important goal of the NSTX-U research program. 28 GHz electron cyclotron (EC) heating is predicted to rapidly increase the central electron temperature (T{sub e}(0)) of low density NI plasmas generated by Coaxial Helicity Injection (CHI). The increased T{sub e}(0) will significantly reduce the Ip decay rate of CHI plasmas, allowing the coupling of fast wave heating and neutral beam injection. Also 28 GHz electron Bernstein wave (EBW) heating and CD can be used during the I{sub p} flat top in NSTX-U discharges when the plasma is overdense. Ray tracing and Fokker-Planck numerical simulation codes have been used to model EC and EBW heating and CD in NSTX-U. This paper presents a pre-conceptual design for the 28 GHz heating system and some of the results from the numerical simulations.

none,

2013-07-09T23:59:59.000Z

14

Characterization of the plasma current quench during disruptions in the National Spherical Torus Experiment  

SciTech Connect

A detailed analysis of the plasma current quench in the National Spherical Torus Experiment [M.Ono, et al Nuclear Fusion 40, 557 (2000)] is presented. The fastest current quenches are fit better by a linear waveform than an exponential one. Area-normalized current quench times down to .4 msec/m2 have been observed, compared to the minimum of 1.7 msec/m2 recommendation based on conventional aspect ratio tokamaks; as noted in previous ITPA studies, the difference can be explained by the reduced self-inductance at low aspect ratio and high-elongation. The maximum instantaneous dIp/dt is often many times larger than the mean quench rate, and the plasma current before the disruption is often substantially less than the flat-top value. The poloidal field time-derivative during the disruption, which is directly responsible for driving eddy currents, has been recorded at various locations around the vessel. The Ip quench rate, plasma motion, and magnetic geometry all play important roles in determining the rate of poloidal field change.

Gerhardt, S.P., Menard, J.E., and the NSTX Research Team

2008-12-17T23:59:59.000Z

15

Fast-ion Energy Loss During TAE Avalanches in the National Spherical Torus Experiment  

SciTech Connect

Strong TAE avalanches on NSTX, the National Spherical Torus Experiment [M. Ono, et al., Nucl. Fusion 40 (2000) 557] are typically correlated with drops in the neutron rate in the range of 5% - 15%. In previous studies of avalanches in L-mode plasmas, these neutron drops were found to be consistent with modeled losses of fast ions. Here we expand the study to TAE avalanches in NSTX H-mode plasmas with improved analysis techniques. At the measured TAE mode amplitudes, simulations with the ORBIT code predict that fast ion losses are negligible. However, the simulations predict that the TAE scatter the fast ions in energy, resulting in a small (? 6%) drop in fast ion ?. The net decrease in energy of the fast ions is sufficient to account for the bulk of the drop in neutron rate, even in the absence of fast ion losses. This loss of energy from the fast ion population is comparable to the estimated energy lost by damping from the Alfven wave during the burst. The previously studied TAE avalanches in L-mode are re-evaluated using an improved calculation of the potential fluctuations in the ORBIT code.

Fredrickson, E D; Darrow, D S; Gorelenkov, N N; Kramer, G J; Kubota, S; Podesta, M; White, R B; Bortolon, A; Gerhardt, S P; Bell, R E; Diallo, A; LeBlanc, B; Levinton, F M

2012-07-11T23:59:59.000Z

16

Status and Plans for the National Spherical Torus Experimental Research Facility  

SciTech Connect

An overview of the research capabilities and the future plans on the MA-class National Spherical Torus Experiment (NSTX) at Princeton is presented. NSTX research is exploring the scientific benefits of modifying the field line structure from that in more conventional aspect ratio devices, such as the tokamak. The relevant scientific issues pursued on NSTX include energy confinement, MHD stability at high beta, non-inductive sustainment, solenoid-free start-up, and power and particle handling. In support of the NSTX research goal, research tools are being developed by the NSTX team. In the context of the fusion energy development path being formulated in the US, an ST-based Component Test Facility (CTF) and, ultimately a high beta Demo device based on the ST, are being considered. For these, it is essential to develop high performance (high beta and high confinement), steady-state (non-inductively driven) ST operational scenarios and an efficient solenoid-free start-up concept. We will also briefly describe the Next-Step-ST (NSST) device being designed to address these issues in fusion-relevant plasma conditions.

M. Ono; M.G. Bell; R.E. Bell; J.M. Bialek; T. Bigelow; M. Bitter; plus 148 additional authors

2005-07-27T23:59:59.000Z

17

Plasma Response to Lithium-Coated Plasma-Facing Components in the National Spherical Torus Experiment  

Science Conference Proceedings (OSTI)

Experiments in the National Spherical Torus Experiment (NSTX) have shown beneficial effects on the performance of divertor plasmas as a result of applying lithium coatings on the graphite and carbonfiber- composite plasma-facing components. These coatings have mostly been applied by a pair of lithium evaporators mounted at the top of the vacuum vessel which inject collimated streams of lithium vapor towards the lower divertor. In NBI-heated, deuterium H-mode plasmas run immediately after the application of lithium, performance modifications included decreases in the plasma density, particularly in the edge, and inductive flux consumption, and increases in the electron and ion temperatures and the energy confinement time. Reductions in the number and amplitude of ELMs were observed, including complete ELM suppression for periods up to 1.2 s, apparently as a result of altering the stability of the edge. However, in the plasmas where ELMs were suppressed, there was a significant secular increase in the effective ion charge Zeff and the radiated power as a result of increases in the carbon and medium-Z metallic impurities, although not of lithium itself which remained at a very low level in the plasma core, lithium also inhibited parasitic losses through the scrape-off layer of ICRF power coupled to the plasma, enabling the waves to heat electrons in the core of H-mode plasmas produced by NBI. Lithium has also been introduced by injecting a stream of chemically stabilized, fine lithium powder directly into the scrape-off layer of NBI-heated plasmas. The lithium was ionized in the SOL and appeared to flow along the magnetic field to the divertor plates. This method of coating produced similar effects to the evaporated lithium but at lower amounts.

M.G. Bell, H.W. Kugel, R. Kaita, L.E. Zakharov, H. Schneider, B.P. LeBlanc, D. Mansfield, R.E. Bell, R. Maingi, S. Ding, S.M. Kaye, S.F. Paul, S.P. Gerhardt, J.M. Canik, J.C. Hosea, G. Taylor and the NSTX Research Team

2009-08-20T23:59:59.000Z

18

High Harmonic Fast Wave Heating Efficiency Enhancement and Current Drive at Longer Wavelength on the National Spherical Torus Experiment  

Science Conference Proceedings (OSTI)

High harmonic fast wave heating and current drive CD are being developed on the National Spherical Torus Experiment M. Ono et al., Nucl. Fusion 41, 1435 2001 for supporting startup and sustainment of the spherical torus plasma. Considerable enhancement of the core heating efficiency from 44% to 65% has been obtained for CD phasing of the antenna strap-to-strap = 90 , k= 8 m 1 by increasing the magnetic field from 4.5 to 5.5 kG. This increase in efficiency is strongly correlated to moving the location of the onset density for perpendicular fast wave propagation nonsetBk 2 / away from the antenna face and wall, and hence reducing the propagating surface wave fields. Radio frequency RF waves propagating close to the wall at lower B and k can enhance power losses from both the parametric decay instability PDI and wave dissipation in sheaths and structures around the machine. The improved efficiency found here is attributed to a reduction in the latter, as PDI losses are little changed at the higher magnetic field. Under these conditions of higher coupling efficiency, initial measurements of localized CD effects have been made and compared with advanced RF code simulations.

Hosea, J. [Princeton Plasma Physics Laboratory (PPPL); Bell, R. E. [Princeton Plasma Physics Laboratory (PPPL); LeBlanc, B [Princeton Plasma Physics Laboratory (PPPL); Phillips, Cynthia [Princeton Plasma Physics Laboratory (PPPL); Taylor, G. [Princeton Plasma Physics Laboratory (PPPL); Valeo, Dr Ernest [Princeton Plasma Physics Laboratory (PPPL); Wilson, J. R. [Princeton Plasma Physics Laboratory (PPPL); Jaeger, Erwin Frederick [ORNL; Ryan, Philip Michael [ORNL; Wilgen, John B [ORNL; Yuh, H. [Nova Photonics; Levinton, F. [Fusion Physics and Technology; Sabbagh, S. A. [Columbia University; Tritz, K. [Johns Hopkins University; Parker, J. [Cornell University; Bonoli, P. [Massachusetts Institute of Technology (MIT); Harvey, R. W. [CompX, Del Mar, CA

2008-01-01T23:59:59.000Z

19

High Harmonic Fast Wave Heating Efficiency Enhancemen and Current Drive at Longer Wavelength on the National Spherical Torus Experiment  

SciTech Connect

High harmonic fast wave heating and current drive (CD) are being developed on the National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 41, 1435 (2001)] for supporting startup and sustainment of the ST plasma. Considerable enhancement of the core heating efficiency (?) from 44% to 65% has been obtained for CD phasing of the antenna (strap-to-strap ? = -90o, k? = -8 m-1) by increasing the magnetic field from 4.5 kG to 5.5 kG. This increase in efficiency is strongly correlated to moving the location of the onset density for perpendicular fast wave propagation (nonset ? ??× k|| 2/w) away from the antenna face and wall, and hence reducing the propagating surface wave fields. RF waves propagating close to the wall at lower B? and k|| can enhance power losses from both the parametric decay instability (PDI) and wave dissipation in sheaths and structures around the machine. The improved efficiency found here is attributed to a reduction in the latter, as PDI losses are little changed at the higher magnetic field. Under these conditions of higher coupling efficiency, initial measurements of localized CD effects have been made and compared with advanced RF code simulations

J. Hosea, R. E. Bell, B.P. LeBlanc, C.K. Phillips, G. Taylor, E. Valeo, J.R. Wilson, E.F. Jaeger, P.M. Ryan, J. Wilgen, H. Yuh, F. Levinton, S. Sabbagh, K. Tritz, J. Parker, P.T. Bonoli, R. Harvey, and the NSTX Team

2008-01-14T23:59:59.000Z

20

Next-Step Spherical Torus Experiment and Spherical Torus Strategy in the Fusion Energy Development Path  

SciTech Connect

A spherical torus (ST) fusion energy development path which is complementary to proposed tokamak burning plasma experiments such as ITER is described. The ST strategy focuses on a compact Component Test Facility (CTF) and higher performance advanced regimes leading to more attractive DEMO and Power Plant scale reactors. To provide the physics basis for the CTF an intermediate step needs to be taken which we refer to as the ''Next Step Spherical Torus'' (NSST) device and examine in some detail herein. NSST is a ''performance extension'' (PE) stage ST with the plasma current of 5-10 MA, R = 1.5 m, and Beta(sub)T less than or equal to 2.7 T with flexible physics capability. The mission of NSST is to: (1) provide a sufficient physics basis for the design of CTF, (2) explore advanced operating scenarios with high bootstrap current fraction/high performance regimes, which can then be utilized by CTF, DEMO, and Power Plants, and (3) contribute to the general plasma/fusion science of high beta toroidal plasmas. The NSST facility is designed to utilize the Tokamak Fusion Test Reactor (or similar) site to minimize the cost and time required for the design and construction.

M. Ono; M. Peng; C. Kessel; C. Neumeyer; J. Schmidt; J. Chrzanowski; D. Darrow; L. Grisham; P. Heitzenroeder; T. Jarboe; C. Jun; S. Kaye; J. Menard; R. Raman; T. Stevenson; M. Viola; J. Wilson; R. Woolley; I. Zatz

2003-10-27T23:59:59.000Z

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21

Integration of Microsoft Windows Applications with MDSplus Data Acquisition on the National Spherical Torus Experiment at the Princeton Plasma Physics Laboratory  

SciTech Connect

Data acquisition on the National Spherical Torus Experiment (NSTX) at the Princeton Plasma Physics Laboratory (PPPL) has increasingly involved the use of Personal Computers (PC's) and specially developed ''turn-key'' hardware and software systems to control diagnostics. Interaction with these proprietary software packages is accomplished through use of Visual Basic, or Visual C++ and COM (Component Object Model) technology. COM is a software architecture that allows the components made by different software vendors to be combined into a variety of applications. This technology is particularly well suited to these systems because of its programming language independence, standards for function calling between components, and ability to transparently reference remote processes. COM objects make possible the creation of acquisition software that can control the experimental parameters of both the hardware and software. Synchronization of these applications for diagnostics, such as CCD camer as and residual gas analyzers, with the rest of the experiment event cycle at PPPL has been made possible by utilization of the MDSplus libraries for Windows. Instead of transferring large data files to remote disk space, Windows MDSplus events and I/O functions allow us to put raw data into MDSplus directly from IDL for Windows and Visual Basic. The combination of COM technology and the MDSplus libraries for Windows provide the tools for many new possibilities in versatile acquisition applications and future diagnostics.

Dana M. Mastrovito

2002-03-14T23:59:59.000Z

22

Progress Towards High Performance, Steady-state Spherical Torus  

SciTech Connect

Research on the Spherical Torus (or Spherical Tokamak) is being pursued to explore the scientific benefits of modifying the field line structure from that in more moderate aspect-ratio devices, such as the conventional tokamak. The Spherical Tours (ST) experiments are being conducted in various U.S. research facilities including the MA-class National Spherical Torus Experiment (NSTX) at Princeton, and three medium-size ST research facilities: Pegasus at University of Wisconsin, HIT-II at University of Washington, and CDX-U at Princeton. In the context of the fusion energy development path being formulated in the U.S., an ST-based Component Test Facility (CTF) and, ultimately a Demo device, are being discussed. For these, it is essential to develop high-performance, steady-state operational scenarios. The relevant scientific issues are energy confinement, MHD stability at high beta (B), noninductive sustainment, ohmic-solenoid-free start-up, and power and particle handling. In the confinement area, the NSTX experiments have shown that the confinement can be up to 50% better than the ITER-98-pby2 H-mode scaling, consistent with the requirements for an ST-based CTF and Demo. In NSTX, CTF-relevant average toroidal beta values bT of up to 35% with the near unity central betaT have been obtained. NSTX will be exploring advanced regimes where bT up to 40% can be sustained through active stabilization of resistive wall modes. To date, the most successful technique for noninductive sustainment in NSTX is the high beta-poloidal regime, where discharges with a high noninductive fraction ({approx}60% bootstrap current + neutral-beam-injected current drive) were sustained over the resistive skin time. Research on radio-frequency-based heating and current drive utilizing HHFW (High Harmonic Fast Wave) and EBW (Electron Bernstein Wave) is also pursued on NSTX, Pegasus, and CDX-U. For noninductive start-up, the Coaxial Helicity Injection (CHI), developed in HIT/HIT-II, has been adopted on NSTX to test the method up to Ip {approx} 500 kA. In parallel, start-up using radio-frequency current drive and only external poloidal field coils are being developed on NSTX. The area of power and particle handling is expected to be challenging because of the higher power density expected in the ST relative to that in conventional aspect-ratio tokamaks. Due to its promise for power and particle handling, liquid lithium is being studied in CDX-U as a potential plasma-facing surface for a fusion reactor.

M. Ono; M.G. Bell; R.E. Bell; T. Bigelow; M. Bitter; W. Blanchard; J. Boedo; C. Bourdelle; C. Bush; W. Choe; J. Chrzanowski; D.S. Darrow; S.J. Diem; R. Doerner; P.C. Efthimion; J.R. Ferron; R.J. Fonck; E.D. Fredrickson; G.D. Garstka; D.A. Gates; T. Gray; L.R. Grisham; W. Heidbrink; K.W. Hill; D. Hoffman; T.R. Jarboe; D.W. Johnson; R. Kaita; S.M. Kaye; C. Kessel; J.H. Kim; M.W. Kissick; S. Kubota; H.W. Kugel; B.P. LeBlanc; K. Lee; S.G. Lee; B.T. Lewicki; S. Luckhardt; R. Maingi; R. Majeski; J. Manickam; R. Maqueda; T.K. Mau; E. Mazzucato; S.S. Medley; J. Menard; D. Mueller; B.A. Nelson; C. Neumeyer; N. Nishino; C.N. Ostrander; D. Pacella; F. Paoletti; H.K. Park; W. Park; S.F. Paul; Y.-K. M. Peng; C.K. Phillips; R. Pinsker; P.H. Probert; S. Ramakrishnan; R. Raman; M. Redi; A.L. Roquemore; A. Rosenberg; P.M. Ryan; S.A. Sabbagh; M. Schaffer; R.J. Schooff; R. Seraydarian; C.H. Skinner; A.C. Sontag; V. Soukhanovskii; J. Spaleta; T. Stevenson; D. Stutman; D.W. Swain; E. Synakowski; Y. Takase; X. Tang; G. Taylor; J. Timberlake; K.L. Tritz; E.A. Unterberg; A. Von Halle; J. Wilgen; M. Williams; J.R. Wilson; X. Xu; S.J. Zweben; R. Akers; R.E. Barry; P. Beiersdorfer; J.M. Bialek; B. Blagojevic; P.T. Bonoli; M.D. Carter; W. Davis; B. Deng; L. Dudek; J. Egedal; R. Ellis; M. Finkenthal; J. Foley; E. Fredd; A. Glasser; T. Gibney; M. Gilmore; R.J. Goldston; R.E. Hatcher; R.J. Hawryluk; W. Houlberg; R. Harvey; S.C. Jardin; J.C. Hosea; H. Ji; M. Kalish; J. Lowrance; L.L. Lao; F.M. Levinton; N.C. Luhmann; R. Marsala; D. Mastravito; M.M. Menon; O. Mitarai; M. Nagata; G. Oliaro; R. Parsells; T. Peebles; B. Peneflor; D. Piglowski; G.D. Porter; A.K. Ram; M. Rensink; G. Rewoldt; P. Roney; K. Shaing; S. Shiraiwa; P. Sichta; D. Stotler; B.C. Stratton; R. Vero; W.R. Wampler; G.A. Wurden

2003-10-02T23:59:59.000Z

23

Mechanical design considerations of a spherical torus volumetric neutron source  

SciTech Connect

The mechanical design of a spherical torus based volumetric neutron source (ST VNS) is being studied under the support of a DOE-SBIR funding. A device capable of staged operation from a neutron wall loading of 0.5-5.0 MW/m(2) has been scoped out, as the physics and engineering design assumptions are raised from modest to aggressive levels. Margins in the design are ensured since operation of the VNS will be adequate st a wall loading of 2 MW/m(2). The device has a naturally diverted plasma with major radius of 1.07 m, a minor radius of 0.77 m for an aspect ratio of 1.4, an elongation of 3 and triangularity of 0,6. In the neutral beam driven version, the plasma current is 11.1 MA and the toroidal field at the plasma major radius is 2.13 T, The baseline fusion power is 151 MW giving an average neutron wall loading of 2 MV/m(2) on the outboard side over an accessible area of over 15 m(2) for blanket testing. The device utilizes a normal Cu conducting bell jar as the return leg of the toroidal field current, a concept developed at the Oak Ridge National Laboratory. The current is carried by an unshielded single-turn center post (CP) made of dispersion strengthened Cu which is cooled by water in a single pass from top to bottom. A special sliding electrical interface between the CP and the bell jar is provided on the upper end to allow for differential expansion and to isolate the CP from tensile and torsional forces from the bell jar. The ohmic heating in the CP is 153 MW at the start of operation and increases to 178 MW after 3 full power years of operation. Over this period the maximum Cu temperature does not exceed 160 C. This report primarily deals with the design of the CP, one of the most challenging Issues of a low aspect ratio spherical torus. Maintenance approaches for the Or and the divertor assemblies have been determined and are addressed in the paper.

Sviatoslavky, I. N. [University of Wisconsin, Madison; Peng, Yueng Kay Martin [ORNL

1998-01-01T23:59:59.000Z

24

Detection of Disruptions in the High-? Spherical Torus NSTX  

SciTech Connect

This paper describes the prediction of disruptions based on diagnostic data in the high-? spherical torus NSTX [M. Ono, et al., Nuclear Fusion 40 , 557 (2000)]. The disruptive threshold values on many signals are examined. In some cases, raw diagnostic data can be used as a signal for disruption prediction. In others, the deviations of the plasma data from simple models provides the signal used to determine the proximity to disruption. However, no single signal and threshold value can form the basis for disruption prediction in NSTX; thresholds that produce an acceptable false positive rate have too large a missed or late warning rate, while combinations that produce an acceptable rate of missed or late warnings have an unacceptable false positive rate. To solve this problem, a novel means of combining multiple threshold tests has been developed. After being properly tuned, this algorithm can produce a false positive rate of 2.8%, with a late warning rate of 3.7% when applied to a database of ~2000 disruptions collected from three run campaigns. Furthermore, many of these false positives are triggered by near-disruptive MHD events that might indeed be disruptive in larger plasmas with more stored energy. However, the algorithm is less efficient at detecting the MHD event that prompts the disruption process.

Gerhardt, S P; Bell, R E; LeBlanc, B P; Menard, J E; Mueller, D; Roquemore, A L; Sabbagh, S A

2013-01-16T23:59:59.000Z

25

(NATIONAL SPHERICAL TORUS EXPERIMENT) STRUCTURAL DESIGN CRITERIA  

E-Print Network (OSTI)

/or MIL-HDBK- 5). If a small database exists for a candidate material considered for a design component

Princeton Plasma Physics Laboratory

26

Investigation Of A Transient Energetic Charge Exchange Fux Enhancement (?spike-on-tail?) Observed In Neutral-beam-heated H-mode Discharges In The National Spherical Torus Experiment  

SciTech Connect

In the National Spherical Torus Experiment (NSTX), a large increase in the charge exchange neutral flux localized at the Neutral Beam (NB) injection full energy is measured by the E||B (superimposed parallel electric and magnetic fields) Neutral Particle Analyzer (NPA). Termed the High-Energy Feature (HEF), it appears on the NB-injected energetic ion spectrum only in discharges where tearing or kink-type modes (f < 50 kHz) are absent, Toroidal Alfvén Eigenmode (TAE) activity (f ~ 50 - 150 kHz) is weak and Global Alfvén Eigenmode (GAE) activity (f ~ 400 – 1000 kHz) is robust. Compressional Alfvén eigenmode (CAE) activity (f > 1000 kHz) is usually sporadic or absent during the HEF event. The HEF exhibits growth times of ?t ~ 20 - 80 ms, durations of ~ 100 – 600 ms and peak-to-base flux ratios up to H = Fmax /Fmin ~ 10. In infrequent cases, a slowing down distribution below the HEF energy can develop that continues to evolve over periods > 100 ms, a time scale long compared with the typical fast ion equilibration times. HEFs are Transient energetic charge exchange flux enhancement (?spike-on-tail?) 2 observed only in H-mode (not L-mode) discharges with injected power Pb ? 4 MW and in the pitch range ? = vll /v ~ 0.7 – 0.9; i.e. only for passing particles. Increases of ~ 10 - 30 % in the measured neutron yield and total stored energy that are observed to coincide with the feature appear to be driven by concomitant broadening of measured Te(r), Ti(r) and ne(r) profiles and not the HEF itself. While the HEF has minimal impact on plasma performance, it nevertheless poses a challenging wave-particle interaction phenomenon to understand. Candidate mechanisms for HEF formation are developed based on quasilinear theory of wave-particle interaction. The only mechanism found to lead to the large NPA flux ratios, H = Fmax /Fmin , observed in NSTX is the quasilinear evolution of the energetic ion distribution, Fb(E,?,r), in phase space and the concomitant loss of some particles, which occurs due to the cyclotron interaction of the particles with destabilized modes having sufficiently high frequencies, F ~ 700 - 1000 kHz, in the plasma frame that are tentatively identified as Global Alfvén Eigenmodes.

S.S. Medley et. al.

2011-08-04T23:59:59.000Z

27

Ohmic Flux Consumption During Initial Operation of the NSTX Spherical Torus  

E-Print Network (OSTI)

.5, vacuum toroidal field B T = 0.3 Tesla at R 0 , plasma current I P current and flat­top duration achievable with these fluxes. Two di#erent methods have been used previOhmic Flux Consumption During Initial Operation of the NSTX Spherical Torus J. Menard 1 , B. Le

28

Disruptions, Disruptivity, and Safer Operating Windows in the High-? Spherical Torus NSTX  

SciTech Connect

This paper discusses disruption rates, disruption causes, and disruptivity statistics in the high- ?N National Spherical Torus Experiment (NSTX) [M. Ono, et al. Nuclear Fusion 40, 557 (2000)]. While the overall disruption rate is rather high, configurations with high ?N , moderate q*, strong boundary shaping, sufficient rotation, and broad pressure and current profiles are found to have the lowest disruptivity; active n=1 control further reduces the disruptivity. The disruptivity increases rapidly for q*<2.7, which is substantially above the ideal MHD current limit. In quiescent conditions, qmin >1.25 is generally acceptable for avoiding the onset of core rotating n=1 kink/tearing modes; when EPM and ELM disturbances are present, the required qmin for avoiding those modes is raised to ~1.5. The current ramp and early flat-top phase of the discharges are prone to n=1 core rotating modes locking to the wall, leading to a disruption. Small changes to the discharge fueling during this phase can often mitigate the rotation damping associated with these modes and eliminate the disruption. The largest stored energy disruptions are those that occur at high current when a plasma current rampdown is initiated incorrectly.

Gerhardt, S P; Diallo, A; Gates, D; LeBlanc, B P; Menard, J E; Mueller, D; Sabbagh, S A; Soukhanovskii, V; Tritz, K

2012-09-27T23:59:59.000Z

29

EA-1108: The National Spherical Tokamah Experiment at the Princeton...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

8: The National Spherical Tokamah Experiment at the Princeton Plasma Physics Laboratory, Plainsboro Township, New Jersey EA-1108: The National Spherical Tokamah Experiment at the...

30

Electron Bernstein Wave Research on the National Spherical Torus Experiment  

Science Conference Proceedings (OSTI)

Off-axis electron Bernstein wave current drive (EBWCD) may be critical for sustaining non-inductive high ? NSTX plasmas. Numerical modeling results predict that the ~ 100 kA of offaxis current needed to stabilize a solenoid-free high ? NSTX plasma could be generated via Ohkawa CD with 3 MW of 28 GHz EBW power. In addition, synergy between EBWCD and bootstrap current may result in a 10% enhancement in CD efficiency with 4 MW of EBW power. Recent dualpolarization EBW radiometry measurements on NSTX confirm that efficient coupling to EBWs can be readily accomplished by launching elliptically polarized electromagnetic waves oblique to the confining magnetic field, in agreement with numerical modeling. Plans are being developed for implementing a 1 MW, 28 GHz proof-of-principle EBWCD system on NSTX to test the EBW coupling, heating and CD physics at high rf power densities.

Taylor, G. [Princeton Plasma Physics Laboratory (PPPL); Bers, A. [Massachusetts Institute of Technology (MIT); Bigelow, Tim S [ORNL; Carter, Mark Dwain [ORNL; Caughman, John B [ORNL; Decker, J. [Massachusetts Institute of Technology (MIT); Diem, S. [Princeton Plasma Physics Laboratory (PPPL); Efthimion, P. C. [Princeton Plasma Physics Laboratory (PPPL); Ershov, N. M. [Moscow State University; Fredd, E. [Princeton Plasma Physics Laboratory (PPPL); Harvey, R. W. [CompX, Del Mar, CA; Hosea, J. [Princeton Plasma Physics Laboratory (PPPL); Jaeger, F. [Oak Ridge National Laboratory (ORNL); Preinhaelter, J. [Institute of Plasma Physics, Prague, Czech Republic; Ram, A. K. [Massachusetts Institute of Technology (MIT); Rasmussen, David A [ORNL; Smirnov, A. [Moscow State University; Wilgen, John B [ORNL; Wilson, J. R. [Princeton Plasma Physics Laboratory (PPPL)

2005-01-01T23:59:59.000Z

31

PPPL-3445 PPPL-3445 National Spherical Torus Experiment (NSTX)  

E-Print Network (OSTI)

such as the pilot and power plants. The NSTX device began the plasma operations in February 1999 and the plasma (Coaxial Helicity Injection) and HHFW (High Harmonic Fast Wave) experiments have also started. Stable CHI eight antennas connected to two transmitters, up to 2 MW of HHFW power was successfully coupled

32

Final Design Review (FDR) Committee Report National Spherical Torus Experiment  

E-Print Network (OSTI)

prepared as required by DOE 413.3B? · CD-3 checkpoint documentation per DOE 413.3B is currently being identified and currently being prepared as required by DOE 413.3B? 9. Outage planning and coordination - Has. Does the final design meet the requirements for the NSTX Upgrade Project as delineated in the General

Princeton Plasma Physics Laboratory

33

Disruptions, Disruptivity, and Safer Operating Windows in the High-? Spherical Torus NSTX  

Science Conference Proceedings (OSTI)

A fusion pilot plant study was initiated to clarify the development needs in moving from ITER to a first of a kind fusion power plant. The mission of the pilot plant was set to encompass component test and fusion nuclear science missions yet produce net electricity with high availability in a device designed to be prototypical of the commercial device. The objective of the study was to evaluate three different magnetic configuration options, the advanced tokamak (AT), spherical tokamak (ST) and compact stellarator (CS) in an effort to establish component characteristics, maintenance features and the general arrangement of each candidate device. With the move to look beyond ITER the fusion community is now beginning to embark on DEMO reactor studies with an emphasis on defining configuration arrangements that can meet a high availability goal. This paper reviews the AT pilot plant design, detailing the selected maintenance approach, the device arrangement and sizing of the in-vessel components. Details of interfacing auxiliary systems and services that impact the ability to achieve high availability operations will also be discussed.

Brown, T; Goldston, R J; El-Guebaly, L; Kessel, C; Neilson, G H; Malang, S; Menard, J E; Prager, S; Scott, S; Titus, P; Waganer, L

2012-09-26T23:59:59.000Z

34

R t f N l C t T ti Di i GReport of Nuclear Component Testing Discussion Group National Spherical Torus ProgramNational Spherical Torus Program  

E-Print Network (OSTI)

science, MFE and IFE UCSD Whyte, Dennis Boundary physics, BPO MIT Burgess Tom Remote handling ORNL Plasma Burgess, Tom Remote handling ORNL Cadwallader, Lee Fusion safety and environmental protection INL El and lifetime FNT-8: Full remote handling FNT-9: Public safety & SBP-8: Plasma diagnostics & control SBP-9

35

Properties of Alfven Eigenmodes in the TAE range on the National Spherical Torus Experiment-Upgrade  

SciTech Connect

A second Neutral Beam (NB) injection line is being installed on the NSTX Upgrade device, resulting in six NB sources with di erent tangency radii that will be available for heating and current drive. This work explores the properties of instabilities in the frequency range of the Toroidal Alfv#19;en Eigenmode (TAE) for NSTX-U scenarios with various NB injection geometries, from more perpendicular to more tangential, and with increased toroidal magnetic eld with respect to previous NSTX scenarios. Predictions are based on analysis through the ideal MHD code NOVA-K. For the scenarios considered in this work, modi cations of the Alfv#19;en continuum result in a frequency upshift and a broadening of the radial mode structure. The latter e ect may have consequences for fast ion transport and loss. Preliminary stability considerations indicate that TAEs are potentially unstable, with ion Landau damping representing the dominant damping mechanism

none,

2013-04-24T23:59:59.000Z

36

Closeout Report for theCloseout Report for the National Spherical Torus  

E-Print Network (OSTI)

independent project review? 4. Documentation: Is the documentation required by DOE Order 413.3B for CD-3 l by DOE Order 413.3B for CD-3 complete? Has the CD-2 documentation been updated to reflect any h lti f th: Is the documentation required by DOE Order 413 3B for CD 3 complete? Has the CD 2 documentation413.3B for CD-3 complete

Princeton Plasma Physics Laboratory

37

EBW-Bootstrap Current Synergy in the National Spherical Torus Experiment (NSTX)  

SciTech Connect

Current driven by electron Bernstein waves (EBW) and by the electron bootstrap effect are calculated separately and concurrently with a kinetic code, to determine the degree of synergy between them. A target {beta} = 40% NSTX plasma is examined. A simple bootstrap model in the CQL3D Fokker-Planck code is used in these studies: the transiting electron distributions are connected in velocity-space at the trapped-passing boundary to trapped-electron distributions which are displaced radially by a half-banana width outwards/inwards for the co-/counter-passing regions. This model agrees well with standard bootstrap current calculations, over the outer 60% of the plasma radius. Relatively small synergy net bootstrap current is obtained for EBW power up to 4 MW. Locally, bootstrap current density increases in proportion to increased plasma pressure, and this effect can significantly affect the radial profile of driven current.

R.W. Harvey; G. Taylor

2005-02-02T23:59:59.000Z

38

DOEIEA-1108 ENVIRONMENTAL ASSESSMENT THE NATIONAL SPHERICAL TOKAMAK EXPERIMENT  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

108 108 ENVIRONMENTAL ASSESSMENT THE NATIONAL SPHERICAL TOKAMAK EXPERIMENT AT THE PRINCETON PLASMA PHYSICS LABORATORY December 1995 DECLAIMER T h i s report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsi- bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Refer- ence herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recom-

39

EA-1108: The National Spherical Tokamah Experiment at the Princeton Plasma  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

8: The National Spherical Tokamah Experiment at the Princeton 8: The National Spherical Tokamah Experiment at the Princeton Plasma Physics Laboratory, Plainsboro Township, New Jersey EA-1108: The National Spherical Tokamah Experiment at the Princeton Plasma Physics Laboratory, Plainsboro Township, New Jersey SUMMARY This EA evaluates the environmental impacts of the proposal to support fusion physics development and technology, by providing an experimental device to investigate the confinement and performance of plasmas produced in a spherical shaped tokamak at the U.S. Department of Energy Princeton Plasma Physics Laboratory. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD December 1, 1995 EA-1108: Final Environmental Assessment The National Spherical Tokamah Experiment at the Princeton Plasma Physics

40

Liquid Lithium Divertor and Scrape-Off-Layer Interactions on the National Spherical Torus Experiment: 2010 ? 2013 Progress Report  

SciTech Connect

The implementation of the liquid Lithium Divertor (LLD) in NSTX presented a unique opportunity in plasma-material interactions studies. A high density Langmuir Probe (HDLP) array utilizing a dense pack of triple Langmuir probes was built at PPPL and the electronics designed and built by UIUC. It was shown that the HDLP array could be used to characterize the modification of the EEDF during lithium experiments on NSTX as well as characterize the transient particle loads during lithium experiments as a means to study ELMs. With NSTX being upgraded and a new divertor being installed, the HDLP array will not be used in NSTX-U. However UIUC is currently helping to develop two new systems for depositing lithium into NSTX-U, a Liquid Lithium Pellet Dripper (LLPD) for use with the granular injector for ELM mitigation and control studies as well as an Upward-Facing Lithium Evaporator (U-LITER) based on a flash evaporation system using an electron beam. Currently UIUC has Daniel Andruczyk Stationed at PPPL and is developing these systems as well as being involved in preparing the Materials Analysis Particle Probe (MAPP) for use in LTX and NSTX-U. To date the MAPP preparations have been completed. New sample holders were designed by UIUC?s Research Engineer at PPPL and manufactured at PPPL and installed. MAPP is currently being used on LTX to do calibration and initial studies. The LLPD has demonstrated that it can produce pellets. There is still some adjustments needed to control the frequency and particle size. Equipment for the U-LITER has arrived and initial test are being made of the electron beam and design of the U-LITER in progress. It is expected to have these ready for the first run campaign of NSTX-U.

None

2013-08-27T23:59:59.000Z

Note: This page contains sample records for the topic "national spherical torus" 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

Simulation of High-Harmonic Fast-Wave Heating on the National Spherical Tokamak Experiment  

SciTech Connect

Images associated with radio-frequency heating of low-confinement mode plasmas in the National Spherical Tokamak Experiment, as calculated by computer simulation, are presented. The AORSA code has been extended to simulate the whole antenna-to-plasma heating system by including both the kinetic physics of the well-confined core plasma and a poorly confined scrape-off plasma and vacuum vessel structure. The images presented show the 3-D electric wave field amplitude for various antenna phasings. Visualization of the simulation results in 3-D makes clear that -30 degrees phasing excites kilo-volt per meter coaxial standing modes in the scrape-off plasma and shows magnetic-field-aligned whispering-gallery type modes localized to the plasma edge.

Green, David L [ORNL; Jaeger, Erwin Frederick [ORNL; Chen, Guangye [ORNL; Berry, Lee A [ORNL; Pugmire, Dave [ORNL; Canik, John [ORNL; Ryan, Philip Michael [ORNL

2011-01-01T23:59:59.000Z

42

Spherical Torus (Spherical Tokamak) on the Path to Fusion Energy  

E-Print Network (OSTI)

USBPO-ITPA activities in preparation for burning plasma research in ITER using physics breadth provided and benefits from USBPO-ITPA in preparing for burning plasma research on ITER "Locked mode" threshold n

43

Mechanisms of Stochastic Diffusion of Energetic Ions in Spherical Tori  

Science Conference Proceedings (OSTI)

Stochastic diffusion of the energetic ions in spherical tori is considered. The following issues are addressed: (I) Goldston-White-Boozer diffusion in a rippled field; (ii) cyclotron-resonance-induced diffusion caused by the ripple; (iii) effects of non-conservation of the magnetic moment in an axisymmetric field. It is found that the stochastic diffusion in spherical tori with a weak magnetic field has a number of peculiarities in comparison with conventional tokamaks; in particular, it is characterized by an increased role of mechanisms associated with non-conservation of the particle magnetic moment. It is concluded that in current experiments on National Spherical Torus eXperiment (NSTX) the stochastic diffusion does not have a considerable influence on the confinement of energetic ions.

Ya.I. Kolesnichenko; R.B. White; Yu.V. Yakovenko

2001-01-18T23:59:59.000Z

44

3D TORUS V1.0  

Energy Science and Technology Software Center (OSTI)

002440MLTPL00 3D Torus Routing Engine Module for OFA OpenSM v. 1.0  http://www.openfabrics.org/git?p=sashak/management.git;a=sum 

45

Spherical splines and orientation interpolation  

Science Conference Proceedings (OSTI)

Keywords: interpolation, orientations, interpolation, spatial rotation, interpolation, spherical splines, quaternions

A. P. Pobegailo

1994-01-01T23:59:59.000Z

46

Magnetic surfaces in an axisymmetric torus  

SciTech Connect

A method is developed for specifying the boundary equilibrium magnetic surface in an axially symmetric torus by using the absolute values of the magnetic field B = B{sub s}({theta}) and the gradient of the poloidal flux vertical bar vertical bar {nabla}{Psi} vertical bar = vertical bar {nabla}{Psi} vertical bar {sub s}({theta}) in a special flux coordinate system. By setting two surface constants (e.g., the safety factor q and dp/d{Psi}) and matching the absolute values of the magnetic field and the flux gradient on a closed magnetic surface, it is possible to find all equilibrium magnetic functions (including n {center_dot} {nabla} ln B and the local shear s) and all constants (including the toroidal current J and the shear d{mu}/d{Psi}) on this surface. Such a non-traditional formulation of the boundary conditions in solving the stability problem in an axisymmetric torus allows one to impose intentional conditions on plasma confinement and MHD stability at the periphery of the system.

Skovoroda, A. A., E-mail: skovorod@nfi.kiae.ru [National Research Centre Kurchatov Institute (Russian Federation)

2013-04-15T23:59:59.000Z

47

High-beta tokamak research Torus I and Torus II. Quarterly status report, 1 April-30 June 1978  

SciTech Connect

Status of the high-beta tokamak research program at Columbia University is reported for the period 1 April through 30 June 1978. Activities on Torus I Belt Pinch and Torus II high beta tokamak are discussed. Engineering improvements, budget, schedule personnel and capital equipment considerations are also presented.

Gross, R.A.

1978-07-06T23:59:59.000Z

48

Dyonic BPS saturated black holes of heterotic string on a six-torus  

E-Print Network (OSTI)

Within effective heterotic superstring theory compactified on a six-torus we derive minimum energy (supersymmetric), static, spherically symmetric solutions, which are manifestly invariant under the target space O(6,22) and the strong-weak coupling SL(2,I\\!\\!R) duality symmetries with 28 electric and 28 magnetic charges subject to one constraint. The class of solutions with a constant axion corresponds to dyonic configurations subject to two charge constraints, with purely electric [or purely magnetic] and dyonic configurations preserving {1\\over 2} and {1\\over 4} of N=4 supersymmetry, respectively. General dyonic configurations in this class have a space-time of extreme Reissner-Nordstr\\" om black holes while configurations with more constrained charges have a null or a naked singularity.

Cvetic, M; Cveti, Mirjam; Youm, Donam

1995-01-01T23:59:59.000Z

49

Spherically Symmetric Gravitational Collapse  

E-Print Network (OSTI)

In this paper, we discuss gravitational collapse of spherically symmetric spacetimes. We derive a general formalism by taking two arbitrary spherically symmetric spacetimes with $g_{00}=1$. Israel's junction conditions are used to develop this formalism. The formulae for extrinsic curvature tensor are obtained. The general form of the surface energy-momentum tensor depending on extrinsic curvature tensor components is derived. This leads us to the surface energy density and the tangential pressure. The formalism is applied to two known spherically symmetric spacetimes. The results obtained show the regions for the collapse and expansion of the shell.

M. Sharif; Khadija Iqbal

2008-12-03T23:59:59.000Z

50

Large displacement spherical joint  

DOE Patents (OSTI)

A new class of spherical joints has a very large accessible full cone angle, a property which is beneficial for a wide range of applications. Despite the large cone angles, these joints move freely without singularities.

Bieg, Lothar F. (Albuquerque, NM); Benavides, Gilbert L. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

51

Maass Cusp Forms on Singly Punctured Two-Torus  

Science Conference Proceedings (OSTI)

Quantum mechanical systems on punctured surfaces modeled by hyperbolic spaces can play an interesting role in exploring quantum chaos and in studying behaviour of future quantum nano-devices. The case of singly-punctured two-torus, for example, has been well-studied in the literature particularly for its scattering states. However, the bound states on the punctured torus given by Maass cusp forms are lesser known. In this note, we report on the algorithm of numerically computing these functions and we present ten lower-lying eigenvalues for each odd and even Maass cusp forms.

Siddig, Abubaker Ahmed Mohamed [Laboratory of Computational Sciences and Informatics, Institute for Mathematical Research Universiti Putra Malaysia, 43400 UPM Serdang, Selangor (Malaysia); Shah, Nurisya Mohd [Theoretical Physics Group, Department of Physics, Faculty of Science Universiti Putra Malaysia, 43400 UPM Serdang, Selangor (Malaysia); Zainuddin, Hishamuddin [Laboratory of Computational Sciences and Informatics, Institute for Mathematical Research Universiti Putra Malaysia, 43400 UPM Serdang, Selangor (Malaysia); Theoretical Physics Group, Department of Physics, Faculty of Science Universiti Putra Malaysia, 43400 UPM Serdang, Selangor (Malaysia)

2009-07-07T23:59:59.000Z

52

From Large N Matrices to the Noncommutative Torus  

E-Print Network (OSTI)

We describe how and to what extent the noncommutative two-torus can be approximated by a tower of finite-dimensional matrix geometries. The approximation is carried out for both irrational and rational deformation parameters by embedding the algebra of the noncommutative torus into an approximately finite algebra. The construction is a rigorous derivation of the recent discretizations of noncommutative gauge theories using finite dimensional matrix models, and it shows precisely how the continuum limits of these models must be taken. We clarify various aspects of Morita equivalence using this formalism and describe some applications to noncommutative Yang-Mills theory.

G. Landi; F. Lizzi; R. J. Szabo

1999-12-15T23:59:59.000Z

53

Spherical neutron generator - Energy Innovation Portal  

A spherical neutron generator is formed with a small spherical target and a spherical shell RF-driven plasma ion source surrounding the target. A ...

54

Hollow spherical shell manufacture  

DOE Patents (OSTI)

A process for making a hollow spherical shell of silicate glass composition in which an aqueous suspension of silicate glass particles and an immiscible liquid blowing agent is placed within the hollow spherical cavity of a porous mold. The mold is spun to reduce effective gravity to zero and to center the blowing agent, while being heated so as to vaporize the immiscible liquid and urge the water carrier of the aqueous suspension to migrate into the body of the mold, leaving a green shell compact deposited around the mold cavity. The green shell compact is then removed from the cavity, and is sintered for a time and a temperature sufficient to form a silicate glass shell of substantially homogeneous composition and uniform geometry.

O' Holleran, Thomas P. (Belleville, MI)

1991-01-01T23:59:59.000Z

55

Hollow spherical shell manufacture  

DOE Patents (OSTI)

A process is disclosed for making a hollow spherical shell of silicate glass composition in which an aqueous suspension of silicate glass particles and an immiscible liquid blowing agent is placed within the hollow spherical cavity of a porous mold. The mold is spun to reduce effective gravity to zero and to center the blowing agent, while being heated so as to vaporize the immiscible liquid and urge the water carrier of the aqueous suspension to migrate into the body of the mold, leaving a green shell compact deposited around the mold cavity. The green shell compact is then removed from the cavity, and is sintered for a time and a temperature sufficient to form a silicate glass shell of substantially homogeneous composition and uniform geometry. 3 figures.

O' Holleran, T.P.

1991-11-26T23:59:59.000Z

56

Spherical nitroguanidine process  

DOE Patents (OSTI)

A process of preparing spherical high bulk density nitroguanidine by dissing low bulk density nitroguanidine in N-methyl pyrrolidone at elevated temperatures and then cooling the solution to lower temperatures as a liquid characterized as a nonsolvent for the nitroguanidine is provided. The process is enhanced by inclusion in the solution of from about 1 ppm up to about 250 ppm of a metal salt such as nickel nitrate, zinc nitrate or chromium nitrate, preferably from about 20 to about 50 ppm.

Sanchez, John A. (Los Alamos, NM); Roemer, Edward L. (Los Alamos, NM); Stretz, Lawrence A. (Los Alamos, NM)

1990-01-01T23:59:59.000Z

57

NGC 5548: The AGN Energy Budget Problem and the Geometry of the Broad-Line Region and Torus  

E-Print Network (OSTI)

We consider in detail the spectral energy distribution (SED) and multi-wavelength variability of NGC5548. Comparison with the SEDs of other AGNs implies that the internal reddening of NGC5548 is E(B-V) = 0.17 mag. The extinction curve is consistent with the mean curve of other AGNs found by Gaskell & Benker, but inconsistent with an SMC-type reddening curve. Because most IR emission originates exterior to the broad-line region (BLR), the SED seen by the inner BLR is different from that seen by the outer BLR and from the earth. The most likely BLR covering factor is ~ 40% and it is not possible to get an overall BLR covering factor of less than 20%. This requires that the BLR is not spherically symmetric and that we are viewing through a hole. Line-continuum variability transfer functions are consistent with this geometry. The covering factor and geometry imply that near the equatorial plane the BLR covering approaches 100%. The spectrum seen by the outer regions of the BLR and by the torus is thus modified by the absorption in the inner BLR. This shielding solves the problem of observed BLR ionization stratification being much greater than implied by photoionization models. The BLR obscuration also removes the problem of the torus covering factor being greater than the BLR covering factor, and gives consistency with the observed fraction of obscured AGNs. The flux reduction at the torus also reduces the problem of AGN dust-reverberation lags giving sizes smaller than the dust-sublimation radii.

C. Martin Gaskell; Elizabeth S. Klimek; Ludmila S. Nazarova

2007-11-07T23:59:59.000Z

58

Double slotted socket spherical joint  

DOE Patents (OSTI)

A new class of spherical joints is disclosed. These spherical joints are capable of extremely large angular displacements (full cone angles in excess of 270.degree.), while exhibiting no singularities or dead spots in their range of motion. These joints can improve or simplify a wide range of mechanical devices.

Bieg, Lothar F. (Albuquerque, NM); Benavides, Gilbert L. (Albuquerque, NM)

2001-05-22T23:59:59.000Z

59

Fermion Quasi-Spherical Harmonics  

E-Print Network (OSTI)

Spherical Harmonics, $Y_\\ell^m(\\theta,\\phi)$, are derived and presented (in a Table) for half-odd-integer values of $\\ell$ and $m$. These functions are eigenfunctions of $L^2$ and $L_z$ written as differential operators in the spherical-polar angles, $\\theta$ and $\\phi$. The Fermion Spherical Harmonics are a new, scalar and angular-coordinate-dependent representation of fermion spin angular momentum. They have $4\\pi$ symmetry in the angle $\\phi$, and hence are not single-valued functions on the Euclidean unit sphere; they are double-valued functions on the sphere, or alternatively are interpreted as having a double-sphere as their domain.

G. Hunter; P. Ecimovic; I. Schlifer; I. M. Walker; D. Beamish; S. Donev; M. Kowalski; S. Arslan; S. Heck

1998-10-02T23:59:59.000Z

60

A parallel implementation of Strassen's matrix multiplication algorithm for wormhole-routed all-port 2D torus networks  

Science Conference Proceedings (OSTI)

A new parallel implementation of Strassen's matrix multiplication algorithm is proposed for massively parallel supercomputers with 2D, all-port torus interconnection networks. The proposed algorithm employs a special conflict-free routing pattern for ... Keywords: 2D torus, Fast Matrix Multiplication, Parallel processing, Strassen's matrix multiplication, Torus interconnection networks

Cesur Baransel; Kayhan M. ?mre

2012-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "national spherical torus" 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

Major Milestone: PPPL completes first quadrant of the heart of...  

NLE Websites -- All DOE Office Websites (Extended Search)

Major Milestone: PPPL completes first quadrant of the heart of the National Spherical Torus Experiment Upgrade By John Greenwald March 18, 2013 Tweet Widget Facebook Like Google...

62

BayesCLUMPY: BAYESIAN INFERENCE WITH CLUMPY DUSTY TORUS MODELS  

SciTech Connect

Our aim is to present a fast and general Bayesian inference framework based on the synergy between machine learning techniques and standard sampling methods and apply it to infer the physical properties of clumpy dusty torus using infrared photometric high spatial resolution observations of active galactic nuclei. We make use of the Metropolis-Hastings Markov Chain Monte Carlo algorithm for sampling the posterior distribution function. Such distribution results from combining all a priori knowledge about the parameters of the model and the information introduced by the observations. The main difficulty resides in the fact that the model used to explain the observations is computationally demanding and the sampling is very time consuming. For this reason, we apply a set of artificial neural networks that are used to approximate and interpolate a database of models. As a consequence, models not present in the original database can be computed ensuring continuity. We focus on the application of this solution scheme to the recently developed public database of clumpy dusty torus models. The machine learning scheme used in this paper allows us to generate any model from the database using only a factor of 10{sup -4} of the original size of the database and a factor of 10{sup -3} in computing time. The posterior distribution obtained for each model parameter allows us to investigate how the observations constrain the parameters and which ones remain partially or completely undetermined, providing statistically relevant confidence intervals. As an example, the application to the nuclear region of Centaurus A shows that the optical depth of the clouds, the total number of clouds, and the radial extent of the cloud distribution zone are well constrained using only six filters. The code is freely available from the authors.

Asensio Ramos, A.; Ramos Almeida, C. [Instituto de AstrofIsica de Canarias, 38205, La Laguna, Tenerife (Spain)], E-mail: aasensio@iac.es

2009-05-10T23:59:59.000Z

63

Fabrication of the 320-CM-OD all-ceramic ZT-40 torus  

SciTech Connect

The fabrication of the ZT-40 torus, a large complex all-ceramic toroidal plasma containment vessel, is described. Several glass sealants covering the temperature range of 500 to 1300/sup 0/C, were developed and used to ''braze'' segments of the torus together, sapphire windows to the torus and the required pump-out and diagnostic parts to the ceramic vacuum vessel. Designs of window seals were developed that allowed sealing of the sapphire windows in a vertical position with minimum sealing glass flow.

Hauth, W.E.; Blake, R.D.; Rutz, H.L.; Dickinson, J.M.

1979-01-01T23:59:59.000Z

64

Innovative Confinement Concepts Workshop 2000 (Book of Abstracts)  

E-Print Network (OSTI)

A Spherical Torus Nuclear Fusion Reactor Space PropulsionA Spherical Torus Nuclear Fusion Reactor Space Propulsion

Celata, Christine; Accelerator and Fusion Research Staff

2000-01-01T23:59:59.000Z

65

How Spherical Plasma Crystals Form  

Science Conference Proceedings (OSTI)

The correlation buildup and the formation dynamics of the shell structure in a spherically confined one-component plasma are studied. Using Langevin dynamics simulations the relaxation processes and characteristic time scales and their dependence on the pair interaction and dissipation in the plasma are investigated. While in systems with Coulomb interaction (e.g., trapped ions) in a harmonic confinement shell formation starts at the plasma edge and proceeds inward, this trend is significantly weakened for dusty plasmas with Yukawa interaction. With a suitable change of the confinement conditions the crystallization scenario can be externally controlled.

Kaehlert, H.; Bonitz, M. [Institut fuer Theoretische Physik und Astrophysik, Christian-Albrechts Universitaet zu Kiel, 24098 Kiel (Germany)

2010-01-08T23:59:59.000Z

66

The alternative model of the spherical oscillator  

E-Print Network (OSTI)

The quasiradial wave functions and energy spectra of the alternative model of spherical oscillator on the $D$-dimensional sphere and two-sheeted hyperboloid are found.

Mardoyan, Levon

2007-01-01T23:59:59.000Z

67

The alternative model of the spherical oscillator  

E-Print Network (OSTI)

The quasiradial wave functions and energy spectra of the alternative model of spherical oscillator on the $D$-dimensional sphere and two-sheeted hyperboloid are found.

Levon Mardoyan

2007-08-14T23:59:59.000Z

68

Nonadiabatic charged spherical gravitational collapse  

Science Conference Proceedings (OSTI)

We present a complete set of the equations and matching conditions required for the description of physically meaningful charged, dissipative, spherically symmetric gravitational collapse with shear. Dissipation is described with both free-streaming and diffusion approximations. The effects of viscosity are also taken into account. The roles of different terms in the dynamical equation are analyzed in detail. The dynamical equation is coupled to a causal transport equation in the context of Israel-Stewart theory. The decrease of the inertial mass density of the fluid, by a factor which depends on its internal thermodynamic state, is reobtained, with the viscosity terms included. In accordance with the equivalence principle, the same decrease factor is obtained for the gravitational force term. The effect of the electric charge on the relation between the Weyl tensor and the inhomogeneity of the energy density is discussed.

Di Prisco, A.; Herrera, L. [Escuela de Fisica, Facultad de Ciencias, Universidad Central de Venezuela, Caracas (Venezuela); Le Denmat, G. [Universite Pierre et Marie Curie, CNRS/UMR 8112, LERMA/ERGA, Boite 142, 4 Place Jussieu, 75252 Paris Cedex 05 (France); Observatoire de Paris (France); MacCallum, M. A. H. [School of Mathematical Sciences, Queen Mary, University of London, London E1 4NS (United Kingdom); Santos, N. O. [School of Mathematical Sciences, Queen Mary, University of London, London E1 4NS (United Kingdom); Laboratorio Nacional de Computacao Cientifica, 25651-070 Petropolis, Rio de Janeiro (Brazil)

2007-09-15T23:59:59.000Z

69

The center conjecture for thick spherical buildings  

E-Print Network (OSTI)

We prove that a convex subcomplex of a spherical building of type E7 or E8 is a subbuilding or the group of building automorphisms preserving the subcomplex has a fixed point in it. Together with previous results of Muehlherr-Tits, and Leeb and the author, this completes the proof of Tits' Center Conjecture for thick spherical buildings.

Ramos-Cuevas, Carlos

2009-01-01T23:59:59.000Z

70

The deformations of flat affine structures on the two-torus  

E-Print Network (OSTI)

The group action which defines the moduli problem for the deformation space of flat affine structures on the two-torus is the action of the affine group $\\Aff(2)$ on $\\bbR^2$. Since this action has non-compact stabiliser $\\GL(2,\\bbR)$, the underlying locally homogeneous geometry is highly non-Riemannian. In this article, we describe the deformation space of all flat affine structures on the two-torus. In this context interesting phenomena arise in the topology of the deformation space, which, for example, is \\emph{not} a Hausdorff space. This contrasts with the case of constant curvature metrics, or conformal structures on surfaces, which are encountered in classical Teichm\\"uller theory. As our main result on the space of deformations of flat affine structures on the two-torus we prove that the holonomy map from the deformation space to the variety of conjugacy classes of homomorphisms from the fundamental group of the two-torus to the affine group is a local homeomorphism.

Baues, Oliver

2011-01-01T23:59:59.000Z

71

Equivalence of Two Approaches to Yang-Mills on Non-commutative Torus  

E-Print Network (OSTI)

There are two notions of Yang-Mills action functional in noncommutative geometry. We show that for noncommutative n-torus both these notions agree. We also prove a structure theorem on the Hermitian structure of a finitely generated projective modules over spectrally invariant subalgebras of $C^*$-algebras.

Partha Sarathi Chakraborty; Satyajit Guin

2013-04-29T23:59:59.000Z

72

Preliminary Physics Motivation and Engineering Design Assessment of the National High Power Torus  

Science Conference Proceedings (OSTI)

In April 2006, Dr. Ray Orbach, Director of the DOE Office of Science, challenged the fusion community to "propose a new facility... which will put the U.S. at the lead in world fusion science." Analysis of the gaps between expected ITER performance and the requirements of a demonstration power plant (Demo) pointed to the critical and urgent need to develop fusion-relvant plasma-material interface (PMI) solutions consistent with sustained high plasma performance. A survey of world fusion program indicated that present and planned experimental devices do not advance the PMI issue beyond ITER, and a major dedicated experimental facility is warranted. Such a facility should provide the flexibility and access needed to solve plasma boundary challenges related to divertor heat flux and particle exhaust while also developing methods to minimize hydrogenic isotope retention and remaining compatible with high plasma performance.

Robert D. Woolley

2009-06-11T23:59:59.000Z

73

Bounce-free spherical hydrodynamic implosion  

SciTech Connect

In a bounce-free spherical hydrodynamic implosion, the post-stagnation hot core plasma does not expand against the imploding flow. Such an implosion scheme has the advantage of improving the dwell time of the burning fuel, resulting in a higher fusion burn-up fraction. The existence of bounce-free spherical implosions is demonstrated by explicitly constructing a family of self-similar solutions to the spherically symmetric ideal hydrodynamic equations. When applied to a specific example of plasma liner driven magneto-inertial fusion, the bounce-free solution is found to produce at least a factor of four improvement in dwell time and fusion energy gain.

Kagan, Grigory; Tang Xianzhu; Hsu, Scott C.; Awe, Thomas J. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2011-12-15T23:59:59.000Z

74

FY 2007 Miniature Spherical Retroreflectors Final Report  

SciTech Connect

Miniature spherical retroreflectors, less than 8 millimeters in diameter, are currently being developed to enhance remote optical detection of nuclear proliferation activities. These retroreflecting spheres resemble small, sand-colored marbles that have the unique optical property of providing a strong reflection directly back to the source (i.e., retroreflecting) when illuminated with a laser. The addition of specific coatings, sensitive to specific chemicals or radioactive decay in the environment, can be applied to the surface of these retroreflectors to provide remote detection of nuclear proliferation activities. The presence of radioactive decay (e.g., alpha, gamma, neutron) or specific chemicals in the environment (e.g., TBP, acids) will change the optical properties of the spheres in a predictable fashion, thus indicating the presence or absence of the target materials. One possible scenario might employ an airborne infrared laser system (e.g., quantum-cascade lasers) to illuminate a section of ground littered with these retroreflective spheres. Depending on the coating and the presence of a specific chemical or radioisotope in the environment, the return signal would be modified in some predictable fashion because of fluorescence, frequency shifting, intensity attenuation/enhancement, or change in polarization. Research conducted in FY 2007 focused on developing novel optical fabrication processes and exploiting the unique material properties of chalcogenide infrared-transparent glass (germanium-arsenic-sulfur-tellurium compounds) to produce highly efficient retroreflectors. Pacific Northwest National Laboratory’s approach provides comparable performance to the ideal graded index sphere concept, developed by R. K. Luneburg in 1944 (Luneburg 1944), while greatly reducing the complexity in fabrication by utilizing chalcogenide glass materials and compression-molding processes.

Anheier, Norman C.; Bernacki, Bruce E.; Krishnaswami, Kannan

2008-02-20T23:59:59.000Z

75

On epimorphisms of spherical Moufang buildings  

E-Print Network (OSTI)

In this paper we classify the the epimorphisms of irreducible spherical Moufang buildings (of rank at least 2) defined over a field. As an application we characterize indecomposable epimorphisms of these buildings as those epimorphisms arising from R-buildings.

Struyve, Koen

2011-01-01T23:59:59.000Z

76

Resonant Planetary Waves in a Spherical Atmosphere  

Science Conference Proceedings (OSTI)

A global model of planetary wave propagation in a spherical atmosphere is used to examine the spectrum of free or resonant planetary waves of the solstitial stratosphere. These free modes are located by forcing the model with a weak periodic ...

Mark R. Schoeberl; John H. E. Clark

1980-01-01T23:59:59.000Z

77

Accretion powered spherical wind in general relativity  

E-Print Network (OSTI)

Using full general relativistic calculations, we investigate the possibility of generation of mass outflow from spherical accretion onto non-rotating black holes. Introducing a relativistic hadronic-pressure-supported steady, standing, spherically-symmetric shock surface around a Schwarzschild black hole as the effective physical barrier that may be responsible for the generation of spherical wind, we calculate the mass outflow rate $R_{\\dot m}$ in terms of three accretion parameters and one outflow parameter by simultaneously solving the set of general relativistic hydrodynamic equations describing spherically symmetric, transonic, polytropic accretion and wind around a Schwarzschild black hole. Not only do we provide a sufficiently plausible estimation of $R_{\\dot m}$, we also successfully study the dependence and variation of this rate on various physical parameters governing the flow. Our calculation indicates that independent of initial boundary conditions, the baryonic matter content of this shock-generated wind always correlates with post-shock flow temperature.

Tapas Kumar Das

2002-12-04T23:59:59.000Z

78

A fast directional continuous spherical wavelet transform  

E-Print Network (OSTI)

A fast algorithm for Antoine and Vandergheynst's (1998) directional continuous spherical wavelet transform (CSWT) is presented. Computational requirements are reduced by a factor of O(\\sqrt{N}), when N is the number of pixels on the sphere. The spherical Mexican hat wavelet Gaussianity analysis of the WMAP 1-year data performed by Vielva et al. (2003) is reproduced and confirmed using the fast CSWT. The proposed extension to directional analysis is inherently afforded by the fast CSWT algorithm.

J. D. McEwen; M. P. Hobson; A. N. Lasenby; D. J. Mortlock

2004-09-13T23:59:59.000Z

79

PREPARATION OF SPHERICAL URANIUM DIOXIDE PARTICLES  

DOE Patents (OSTI)

This patent relates to the preparation of high-density, spherical UO/sub 2/ particles 80 to 150 microns in diameter. Sinterable UO/sub 2/ powder is wetted with 3 to 5 weight per cent water and tumbled for at least 48 hours. The resulting spherical particles are then sintered. The sintered particles are useful in dispersion-type fuel elements for nuclear reactors. (AEC)

Levey, R.P. Jr.; Smith, A.E.

1963-04-30T23:59:59.000Z

80

Phases of a two-dimensional large-N gauge theory on a torus  

Science Conference Proceedings (OSTI)

We consider two-dimensional large N gauge theory with D adjoint scalars on a torus, which is obtained from a D+2-dimensional pure Yang-Mills theory on T{sup D+2} with D small radii. The two-dimensional model has various phases characterized by the holonomy of the gauge field around noncontractible cycles of the 2-torus. We determine the phase boundaries and derive the order of the phase transitions using a method developed in an earlier work (hep-th/0910.4526), which is nonperturbative in the 't Hooft coupling and uses a 1/D expansion. We embed our phase diagram in the more extensive phase structure of the D+2-dimensional Yang-Mills theory and match with the picture of a cascade of phase transitions found earlier in lattice calculations. We also propose a dual gravity system based on a Scherk-Schwarz compactification of a D2 brane wrapped on a 3-torus and find a phase structure which is similar to the phase diagram found in the gauge theory calculation.

Mandal, Gautam [Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai 400 005 (India); Morita, Takeshi [Crete Center for Theoretical Physics Department of Physics University of Crete, 71003 Heraklion (Greece)

2011-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "national spherical torus" 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

Brachistochrone of a Spherical Uniform Mass Distribution  

E-Print Network (OSTI)

We solve the brachistochrone problem for a particle travelling through a spherical mass distribution of uniform density. We examine the connection between this problem and the popular "gravity elevator" result. The solution is compared to the well known brachistochrone problem of a particle in a uniform gravitational field.

David R. Mitchell

2006-11-21T23:59:59.000Z

82

METHOD OF MAKING SPHERICAL ACTINIDE CARBIDE  

DOE Patents (OSTI)

This patent describes a method of making uniform, spherical, nonpyrophoric UC. UO/sub 2/ and carbon are mixed in stoichiometric proportions and passed through a plasma flame of inert gas at 10,000 to 13,000 deg C. (AEC)

White, G.D.; O' Rourke, D.C.

1962-12-25T23:59:59.000Z

83

Storage and Aging Effects on Spherical Resorcinol-Formaldehyde Resin Ion Exchange Performance  

SciTech Connect

Bechtel National, Inc. (BNI) is evaluating the alternate Cs ion exchanger, spherical resorcinol-formaldehyde (RF), for use in the River Protection Project-Waste Treatment Plant (RPP-WTP).( ) Previous test activities with spherical RF indicate that it has adequate capacity, selectivity, and kinetics to perform in the plant according to the flowsheet needs. It appears to have better elution and hydraulic properties than the existing alternatives: ground-gel RF and SuperLig® 644 (SL 644).( ) To date, the spherical RF performance testing has been conducted on freshly manufactured resin (within ~2 months of manufacture). The ion exchange resins will be manufactured and shipped to the WTP up to 1 year before being used in the plant. Changes in the resin properties during storage could reduce the capacity of the resin to remove Cs from low-activity waste solutions. Active sites on organic SL-644 resin have been shown to degrade during storage (Arm et al. 2004). Additional testing was needed to study the effects of storage conditions and aging on spherical RF ion exchange performance. Variables that could have a significant impact on ion exchange resins during storage include storage temperature, medium, and time. Battelle—Pacific Northwest Division (PNWD) was contracted to test the effects of various storage conditions on spherical RF resin. Data obtained from the testing will be used by the WTP operations to provide direction for suitable storage conditions and manage the spherical RF resin stock. Storage test conditions included wet and dry resin configurations under nitrogen at three temperatures. Work was initially conducted under contract number 24590-101-TSA-W000-00004 satisfying the needs defined in Appendix C of the Research and Technology Plan( ) TSS A-219 to evaluate the impact of storage conditions on RF resin performance. In February 2007, the contract mechanism was switched to Pacific Northwest National Laboratory (PNNL) Operating Contract DE-AC05-76RL01830.

Fiskum, Sandra K.; Arm, Stuart T.; Edwards, Matthew K.; Steele, Marilyn J.; Thomas, Kathie K.

2007-09-10T23:59:59.000Z

84

Initial Results from the Lost Alpha Diagnostics on Joint European Torus  

DOE Green Energy (OSTI)

Two devices have been installed in the Joint European Torus (JET) vacuum vessel near the plasma boundary to investigate the loss of energetic ions and fusion products in general and alpha particles in particular during the upcoming JET experiments. These devices are (i) a set of multichannel thin foil Faraday collectors, and (ii) a well collimated scintillator which is optically connected to a charge-coupled device. Initial results, including the radial energy and poloidal dependence of lost ions from hydrogen and deuterium plasmas during the 2005–06 JET restart campaign, will be presented.

Darrow, Doug; Cecil, Ed; Ellis, Bob; Fullard, Keith; Hill, Ken; Horton, Alan; Kiptily, Vasily; Pedrick, Les; Reich, Matthias

2007-07-25T23:59:59.000Z

85

Topological Invariants and Ground States Wavefunctions of Topological Insulators on a Torus  

E-Print Network (OSTI)

We define topological invariants in terms of the ground states wavefunctions on a torus. This approach leads to precisely defined formulas for the Hall conductance in four dimensions and the topological magneto-electric $\\theta$ term in three dimensions, and their generalizations in higher dimensions. They are valid in the presence of arbitrary many-body interaction and disorder. These topological invariants systematically generalize the two-dimensional Niu-Thouless-Wu formula, and will be useful in numerical calculations of disordered topological insulators and strongly correlated topological insulators including fractional topological insulators.

Zhong Wang; Shou-Cheng Zhang

2013-08-22T23:59:59.000Z

86

Edge Mode Combinations in the Entanglement Spectra of Non-Abelian Fractional Quantum Hall States on the Torus  

E-Print Network (OSTI)

We present a detailed analysis of bi-partite entanglement in the non-Abelian Moore-Read fractional quantum Hall state of bosons and fermions on the torus. In particular, we show that the entanglement spectra can be decomposed into intricate combinations of different sectors of the conformal field theory describing the edge physics, and that the edge level counting and tower structure can be microscopically understood by considering the vicinity of the thin-torus limit. We also find that the boundary entropy density of the Moore-Read state is markedly higher than in the Laughlin states investigated so far. Despite the torus geometry being somewhat more involved than in the sphere geometry, our analysis and insights may prove useful when adopting entanglement probes to other systems that are more easily studied with periodic boundary conditions, such as fractional Chern insulators and lattice problems in general.

Zhao Liu; Emil J. Bergholtz; Heng Fan; Andreas M. Laeuchli

2011-09-09T23:59:59.000Z

87

Shape fluctuations of a spherical surfactant shell in a ...  

Science Conference Proceedings (OSTI)

Page 1. 1 Shape fluctuations of a spherical surfactant shell in a microemulsion ... Micelles are closed shape structures where the ...

2013-04-02T23:59:59.000Z

88

TORUS: Theory of Reactions for Unstable iSotopes - Year 1 Continuation and Progress Report  

Science Conference Proceedings (OSTI)

The TORUS collaboration derives its name from the research it focuses on, namely the Theory of Reactions for Unstable iSotopes. It is a Topical Collaboration in Nuclear Theory, and funded by the Nuclear Theory Division of the Office of Nuclear Physics in the Office of Science of the Department of Energy. The funding started on June 1, 2010, it will have been running for nine months by the date of submission of this Annual Continuation and Progress Report on March 1, 2011. The extent of funding was reduced from the original application, and now supports one postdoctoral researcher for the years 1 through 3. The collaboration brings together as Principal Investigators a large fraction of the nuclear reaction theorists currently active within the USA. The mission of the TORUS Topical Collaboration is to develop new methods that will advance nuclear reaction theory for unstable isotopes by using three-body techniques to improve direct-reaction calculations, and, by using a new partial-fusion theory, to integrate descriptions of direct and compound-nucleus reactions. This multi-institution collaborative effort is directly relevant to three areas of interest: the properties of nuclei far from stability; microscopic studies of nuclear input parameters for astrophysics, and microscopic nuclear reaction theory.

Arbanas, G; Elster, C; Escher, J; Mukhamedzhanov, A; Nunes, F; Thompson, I J

2011-02-24T23:59:59.000Z

89

Quantum corrected spherical collapse: A phenomenological framework  

SciTech Connect

A phenomenological framework is presented for incorporating quantum gravity motivated corrections into the dynamics of spherically symmetric collapse. The effective equations are derived from a variational principle that guarantees energy conservation and the existence of a Birkhoff theorem. The gravitational potential can be chosen as a function of the areal radius to yield specific nonsingular static spherically symmetric solutions that generically have two horizons. For a specific choice of potential, the effective stress energy tensor violates only the dominant energy condition. The violations are maximum near the inner horizon and die off rapidly. A numerical study of the quantum corrected collapse of a spherically symmetric scalar field in this case reveals that the modified gravitational potential prevents the formation of a central singularity and ultimately yields a static, mostly vacuum, spacetime with two horizons. The matter 'piles up' on the inner horizon giving rise to mass inflation at late times. The Cauchy horizon is transformed into a null, weak singularity, but in contrast to Einstein gravity, the absence of a central singularity renders this null singularity stable.

Ziprick, Jonathan; Kunstatter, Gabor [Perimeter Institute and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, N2L 3G1 (Canada); Department of Physics and Winnipeg Institute of Theoretical Physics, University of Winnipeg, Winnipeg, Manitoba, R3B 2E9 (Canada)

2010-08-15T23:59:59.000Z

90

An Engineering Evaluation of Spherical Resorcinol Formaldehyde Resin  

DOE Green Energy (OSTI)

A small column ion exchange (SCIX) system has been proposed for removal of cesium from caustic, supernatant, and dissolved salt solutions stored or generated from high-level tank wastes at the US Department of Energy (DOE) Hanford Site and Savannah River Sites. In both instances, deployment of SCIX systems, either in-tank or near-tank, is a means of expediting waste pretreatment and dispositioning with minimal or no new infrastructure requirements. Conceptually, the treatment approach can utilize a range of ion exchange media. Previously, both crystalline silicotitanate (CST), an inorganic, nonelutable sorbent, and resorcinol-formaldehyde (RF), an organic, elutable resin, have been considered for cesium removal from tank waste. More recently, Pacific Northwest National Laboratory (PNNL) evaluated use of SuperLig{reg_sign} 644, an elutable ion exchange medium, for the subject application. Results of testing indicate hydraulic limitations of the SuperLig{reg_sign} resin, specifically a high pressure drop through packed ion exchange columns. This limitation is likely the result of swelling and shrinkage of the irregularly shaped (granular) resin during repeated conversions between sodium and hydrogen forms as the resin is first loaded then eluted. It is anticipated that a similar flow limitation would exist in columns packed with conventional, granular RF resin. However, use of spherical RF resin is a likely means of mitigating processing limitations due to excessive pressure drop. Although size changes occur as the spherical resin is cycled through loading and elution operations, the geometry of the resin is expected to effectively mitigate the close packing that leads to high pressure drops across ion exchange columns. Multiple evaluations have been performed to determine the feasibility of using spherical RF resin and to obtain data necessary for design of an SCIX process. The work performed consisted of examination of radiation effects on resin performance, quantification of cesium adsorption performance as a function of operating temperature and pH, and evaluation of sodium uptake (titration) as function of pH and counteranion concentration. The results of these efforts are presented in this report. Hydraulic performance of the resin and the use of eluant alternatives to nitric acid have also been evaluated and have been reported elsewhere (Taylor 2009, Taylor and Johnson 2009).

Birdwell Jr, Joseph F [ORNL; Lee, Denise L [ORNL; Taylor, Paul Allen [ORNL; Collins, Robert T [ORNL; Hunt, Rodney Dale [ORNL

2010-09-01T23:59:59.000Z

91

Quantum exchange interaction of spherically symmetric plasmoids  

E-Print Network (OSTI)

We study nano-sized spherically symmetric plasma structures which are radial nonlinear oscillations of electrons in plasma. The effective interaction of these plasmoids via quantum exchange forces between ions is described. We calculate the energy of this interaction for the case of a dense plasma. The conditions when the exchange interaction is attractive are examined and it is shown that separate plasmoids can form a single object. The application of our results to the theoretical description of stable atmospheric plasma structures is considered.

Maxim Dvornikov

2011-12-01T23:59:59.000Z

92

Spherical gravitating condensers in general relativity  

Science Conference Proceedings (OSTI)

By a spherical gravitating condenser we mean two concentric charged shells made of perfect fluids restricted by the condition that the electric field is nonvanishing only between the shells. Flat space is assumed inside the inner shell. By using Israel's formalism we first analyze the general system of N shells and then concentrate on the two-shell condensers. Energy conditions are taken into account; physically interesting cases are summarized in two tables, but also more exotic situations in which, for example, the inner shell may occur below the inner horizon of the corresponding Reissner-Nordstroem geometry or the spacetime is curved only inside the condenser are considered. Classical limits are mentioned.

Bicak, J.; Guerlebeck, N. [Institute of Theoretical Physics, Charles University, V Holesovickach 2, 180 00 Praha 8-Holesovice (Czech Republic); Max Planck Institute for Gravitational Physics, Albert Einstein Institute, Am Muehlenberg 1, D-14476 Golm (Germany)

2010-05-15T23:59:59.000Z

93

Quantitative perturbative study of convergence to equilibrium for collisional kinetic models in the torus  

E-Print Network (OSTI)

For a general class of linear collisional kinetic models in the torus, including in particular the linearized Boltzmann equation for hard spheres, the linearized Landau equation with hard and moderately soft potentials and the semi-classical linearized fermionic and bosonic relaxation models, we prove explicit coercivity estimates on the associated integro-differential operator for some modified Sobolev norms. We deduce existence of classical solutions near equilibrium for the full non-linear models associated, with explicit regularity bounds, and we obtain explicit estimates on the rate of exponential convergence towards equilibrium in this perturbative setting. The proof are based on a linear energy method which combines the coercivity property of the collision operator in the velocity space with transport effects, in order to deduce coercivity estimates in the whole phase space.

Clément Mouhot; Lukas Neumann

2006-07-21T23:59:59.000Z

94

Results from the RACE (Ring ACceleration Experiment) Compact Torus Acceleration Experiment  

DOE Green Energy (OSTI)

RACE (Ring ACceleration Experiment) is a proof-of-principle experiment aimed at demonstrating acceleration of magnetically confined compact torus plasma rings to directed kinetic energies well in excess of their magnetic and thermal energies. In the course of the first year of operation the following have been observed: successful formation of rings in the RACE geometry; acceleration of rings with large forces, F/sub accelerate/ approx.F/sub equilibrium/ without apparent degradation of the ring structure; peak velocities of approx. =2.5 x 10/sup 8/ cm/sec; acceleration efficiency of >30% at speeds of 1.5 x 10/sup 8/ cm/sec inferred from trajectory and capacitor bank data; kinetic to magnetic energy ratios approx.10 were observed. Experiments in the near future will be aimed at confirmation of the mass/energy measurements by calorimetry and direct density measurements.

Hammer, J.H.; Hartman, C.W.; Eddleman, J.L.; Kusse, B.

1987-06-01T23:59:59.000Z

95

Dose rates from induced activity in the ELMO Bumpy Torus proof-of-principle device  

DOE Green Energy (OSTI)

Calculated results of the dose rates from induced activity in the enclosure of the ELMO Bumpy Torus proof-of-principle device (EBT-P) are presented. A cylindrical model of EBT-P is used. EBT-P will have a hydrogen plasma and thus the plasma will not produce neutrons, but substantial numbers of photoneutrons will be produced and it is the induced activity from these photoneutrons that is considered. The activation dose rates are presented for a variety of operating times and times after shutdown. Dose rates about 5 to 10 mrem/h at 1 h after shutdown are obtained and the major contributor to the dose rate at 1 h after shutdown is found to be /sup 24/Na (half-life=15.0 h).

Alsmiller, R.G.; Barish, J.; Barnes, J.M.; Santoro, R.T.

1983-11-01T23:59:59.000Z

96

Torus equivariant spectral triples for odd dimensional quantum spheres coming from $C^*$-extensions.  

E-Print Network (OSTI)

The torus group $(S^1)^{\\ell+1}$ has a canonical action on the odd dimensional sphere $S_q^{2\\ell+1}$. We take the natural Hilbert space representation where this action is implemented and characterize all odd spectral triples acting on that space and equivariant with respect to that action. This characterization gives a construction of an optimum family of equivariant spectral triples having nontrivial $K$-homology class thus generalizing our earlier results for $SU_q(2)$. We also relate the triple we construct with the $C^*$-extension \\[ 0\\longrightarrow \\clk\\otimes C(S^1)\\longrightarrow C(S_q^{2\\ell+3}) \\longrightarrow C(S_q^{2\\ell+1}) \\longrightarrow 0. \\

Partha Sarathi Chakraborty; Arupkumar Pal

97

Gas and Dark Matter Spherical Dynamics  

E-Print Network (OSTI)

We investigate the formation of spherical cosmological structures following both dark matter and gas components. We focus on the dynamical aspect of the collapse assuming an adiabatic, $\\gamma = 5/3$, fully ionized primordial plasma. We use for that purpose a fully Lagrangian hydrodynamical code designed to describe highly compressible flows in spherical geometry. We investigate also a "fluid approach" to describe the mean physical quantities of the dark matter flow. We test its validity for a wide range of initial density contrast. We show that an homogeneous isentropic core forms in the gas distribution, surrounded by a self-similar hydrostatic halo, with much higher entropy generated by shock dissipation. We derive analytical expressions for the size, density and temperature of the core, as well as for the surrounding halo. We show that, unless very efficient heating processes occur in the intergalactic medium, we are unable to reproduce within adiabatic models the typical core sizes in X-ray clusters. We also show that, for dynamical reasons only, the gas distribution is naturally antibiased relative to the total mass distribution, without invoking any reheating processes. This could explain why the gas fraction increases with radius in very large X-ray clusters. As a preparation for the next study devoted to the thermodynamical aspect of the collapse, we investigate the initial entropy level required to solve the core problem in X-ray clusters.

Jean-Pierre CHIEZE; Romain Teyssier; Jean-Michel Alimi

1997-04-03T23:59:59.000Z

98

Time-dependent quasi-spherical accretion  

E-Print Network (OSTI)

Differentially rotating, "advection-dominated" accretion flows are considered in which the heat generated by viscous dissipation is retained in the fluid. The equations of time-dependent quasi-spherical accretion are solved in a simplified one-dimensional model that neglects the latitudinal dependence of the flow. A self-similar solution is presented that has finite size, mass, angular momentum and energy. This may be expected to be an attractor for the initial-value problem in which a cool and narrow ring of fluid orbiting around a central mass heats up, spreads radially and is accreted. The solution provides some insight into the dynamics of quasi-spherical accretion and avoids many of the strictures of the steady self-similar solution of Narayan & Yi. Special attention is given to the astrophysically important case in which the adiabatic exponent gamma=5/3; even in this case, the flow is found to be differentially rotating and bound to the central object, and accretion can occur without the need for powerful outflows.

G. I. Ogilvie

1999-05-07T23:59:59.000Z

99

Quasi-spherical direct drive fusion.  

SciTech Connect

The authors present designs of quasi-spherical direction drive z-pinch loads for machines such as ZR at 28 MA load current with a 150 ns implosion time (QSDDI). A double shell system for ZR has produced a 2D simulated yield of 12 MJ, but the drive for this system on ZR has essentially no margin. A double shell system for a 56 MA driver at 150 ns implosion has produced a simulated yield of 130 MJ with considerable margin in attaining the necessary temperature and density-radius product for ignition. They also represent designs for a magnetically insulated current amplifier, (MICA), that modify the attainable ZR load current to 36 MA with a 28 ns rise time. The faster pulse provided by a MICA makes it possible to drive quasi-spherical single shell implosions (QSDD2). They present results from 1D LASNEX and 2D MACH2 simulations of promising low-adiabat cryogenic QSDD2 capsules and 1D LASNEX results of high-adiabat cryogenic QSDD2 capsules.

VanDevender, J. Pace; Abbott, Lucas M.; Langston, William L.; McDaniel, Dillon Heirman; Nash, Thomas J.; Roderick, Norman Frederick; Silva, M.

2007-01-01T23:59:59.000Z

100

Spherical Harmonic Solutions to the 3D Kobayashi Benchmark Suite  

SciTech Connect

Spherical harmonic solutions of order 5, 9 and 21 on spatial grids containing up to 3.3 million cells are presented for the Kobayashi benchmark suite. This suite of three problems with simple geometry of pure absorber with large void region was proposed by Professor Kobayashi at an OECD/NEA meeting in 1996. Each of the three problems contains a source, a void and a shield region. Problem 1 can best be described as a box in a box problem, where a source region is surrounded by a square void region which itself is embedded in a square shield region. Problems 2 and 3 represent a shield with a void duct. Problem 2 having a straight and problem 3 a dog leg shaped duct. A pure absorber and a 50% scattering case are considered for each of the three problems. The solutions have been obtained with Ardra, a scalable, parallel neutron transport code developed at Lawrence Livermore National Laboratory (LLNL). The Ardra code takes advantage of a two-level parallelization strategy, which combines message passing between processing nodes and thread based parallelism amongst processors on each node. All calculations were performed on the IBM ASCI Blue-Pacific computer at LLNL.

Brown, P.N.; Chang, B.; Hanebutte, U.R.

1999-12-29T23:59:59.000Z

Note: This page contains sample records for the topic "national spherical torus" 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

Theory for growth of spherical precipitates with capillarity effects  

E-Print Network (OSTI)

precipitation in power plant steels,1,2 there is no analytical solution for the growth of a sphereTheory for growth of spherical precipitates with capillarity effects P. E. J. Rivera-Dõ�az-del-Castillo and H. K. D. H. Bhadeshia Analytical solutions are presented for the growth of spherical precipitates

Cambridge, University of

102

Sphere: multi-touch interactions on a spherical display  

Science Conference Proceedings (OSTI)

Sphere is a multi-user, multi-touch-sensitive spherical display in which an infrared camera used for touch sensing shares the same optical path with the projector used for the display. This novel configuration permits: (1) the enclosure of both the projection ... Keywords: collaboration, multi-touch, single-display groupware, spherical display, surface computing

Hrvoje Benko; Andrew D. Wilson; Ravin Balakrishnan

2008-10-01T23:59:59.000Z

103

Method for preparing spherical thermoplastic particles of uniform size  

DOE Patents (OSTI)

Spherical particles of thermoplastic material of virtually uniform roundness and diameter are prepared by cutting monofilaments of a selected diameter into rod-like segments of a selected uniform length which are then heated in a viscous liquid to effect the formation of the spherical particles.

Day, J.R.

1975-11-17T23:59:59.000Z

104

Study of trajectories around a non-spherical body  

Science Conference Proceedings (OSTI)

In the present work we show the expressions of the gravitational potential of homogeneous bodies with non-spherical three-dimensional shapes in order to study the trajectories around these bodies. The potentials of prolate and oblate ellipsoids with ... Keywords: gravitational potential, non-spherical bodies, oblate ellipsoid, polyhedral model, prolate ellipsoid, tetrahedra

A. A. Silva; A. F. B. A Prado; O. C. Winter

2011-10-01T23:59:59.000Z

105

Hydrogen atom in crossed electric and magnetic fields: Phase space topology and torus quantization via periodic orbits  

E-Print Network (OSTI)

A hierarchical ordering is demonstrated for the periodic orbits in a strongly coupled multidimensional Hamiltonian system, namely the hydrogen atom in crossed electric and magnetic fields. It mirrors the hierarchy of broken resonant tori and thereby allows one to characterize the periodic orbits by a set of winding numbers. With this knowledge, we construct the action variables as functions of the frequency ratios and carry out a semiclassical torus quantization. The semiclassical energy levels thus obtained agree well with exact quantum calculations.

Stephan Gekle; Jörg Main; Thomas Bartsch; T. Uzer

2006-10-02T23:59:59.000Z

106

Applications of fast wave in spherical tokamaks  

SciTech Connect

In spherical tokamaks (ST), the magnetic field strength varies over a wide range across the plasma, and at high betas it deviates significantly from the 1/R dependence of conventional tokamaks. This, together with the high density expected in ST, poses challenging problems for RF heating and current drive. In this paper, the authors investigate the various possible applications of fast waves (FW) in ST. The adjoint technique of calculating current drive is implemented in the raytracing code CURRAY. The applicability of high harmonic and subharmonic FW to steady state ST is considered. They find that high harmonic FW tends to be totally absorbed before reaching the core and may be considered a candidate for off axis current drive while the subharmonic FW tends to be absorbed mainly in the core region and may be considered for central current drive. A difficult problem is the maintenance of current at the startup stage. In the bootstrap ramp-up scenario, the current ramp-up is mainly provided by the bootstrap current. Under this condition, the role of rf becomes mainly the sustainment of plasma through electron heating. Using a slab full-wave code SEMAL, the authors find that the ion-ion-hybrid mode conversion scheme is a promising candidate. The effect of possible existence of edge Alfven resonance and high harmonic cyclotron resonance is investigated and regimes of minimization of edge heating identified.

Chiu, S.C.; Chan, V.S.; Lin-Liu, Y.R.; Miller, R.L.; Prater, R.; Politzer, P.

1997-04-01T23:59:59.000Z

107

focusing of an infinite scalar spherical wave-field  

E-Print Network (OSTI)

This communication discusses the exact analytic solutions to three well-known scalar diffraction theories- the Kirchhoff and first and second Rayleigh-Sommerfeld theories- for the focusing of a monochromatic spherical incident wave in an infiniteaperture system. 1.

On The Exact Kirchhoff; D. C. Bertilone

1991-01-01T23:59:59.000Z

108

Spectral Viscosity for Shallow Water Equations in Spherical Geometry  

Science Conference Proceedings (OSTI)

A spherical spectral viscosity operator is proposed as an alternative to standard horizontal diffusion terms in global atmospheric models. Implementation in NCAR's Spectral Transform Shallow Water Model and application to a suite of standard test ...

Anne Gelb; James P. Gleeson

2001-09-01T23:59:59.000Z

109

Casimir interactions of an object inside a spherical metal shell  

E-Print Network (OSTI)

We investigate the electromagnetic Casimir interactions of an object contained within an otherwise empty, perfectly conducting spherical shell. For a small object we present analytical calculations of the force, which is ...

Zaheer, Saad

110

Trapped Ion Imaging with a High Numerical Aperture Spherical Mirror  

E-Print Network (OSTI)

Efficient collection and analysis of trapped ion qubit fluorescence is essential for robust qubit state detection in trapped ion quantum computing schemes. We discuss simple techniques of improving photon collection efficiency using high numerical aperture (N.A.) reflective optics. To test these techniques we placed a spherical mirror with an effective N.A. of about 0.9 inside a vacuum chamber in the vicinity of a linear Paul trap. We demonstrate stable and reliable trapping of single barium ions, in excellent agreement with our simulations of the electric field in this setup. While a large N.A. spherical mirror introduces significant spherical aberration, the ion image quality can be greatly improved by a specially designed aspheric corrector lens located outside the vacuum system. Our simulations show that the spherical mirror/corrector design is an easy and cost-effective way to achieve high photon collection rates when compared to a more sophisticated parabolic mirror setup.

G Shu; M R Dietrich; N Kurz; B B Blinov

2009-01-29T23:59:59.000Z

111

Trapped Ion Imaging with a High Numerical Aperture Spherical Mirror  

E-Print Network (OSTI)

Efficient collection and analysis of trapped ion qubit fluorescence is essential for robust qubit state detection in trapped ion quantum computing schemes. We discuss simple techniques of improving photon collection efficiency using high numerical aperture (N.A.) reflective optics. To test these techniques we placed a spherical mirror with an effective N.A. of about 0.9 inside a vacuum chamber in the vicinity of a linear Paul trap. We demonstrate stable and reliable trapping of single barium ions, in excellent agreement with our simulations of the electric field in this setup. While a large N.A. spherical mirror introduces significant spherical aberration, the ion image quality can be greatly improved by a specially designed aspheric corrector lens located outside the vacuum system. Our simulations show that the spherical mirror/corrector design is an easy and cost-effective way to achieve high photon collection rates when compared to a more sophisticated parabolic mirror setup.

Shu, G; Kurz, N; Blinov, B B

2009-01-01T23:59:59.000Z

112

Trajectory Calculations for Spherical Geodesic Grids in Cartesian Space  

Science Conference Proceedings (OSTI)

This paper shows how to obtain accurate and efficient trajectory calculations for spherical geodesic grids in Cartesian space. Determination of the departure points is essential to characteristic-based methods that trace the value of a function ...

Francis X. Giraldo

1999-07-01T23:59:59.000Z

113

Global Transport on a Spherical Multiple-Cell Grid  

Science Conference Proceedings (OSTI)

Second- and third-order upstream nonoscillatory (UNO) advection schemes are applied on a spherical multiple-cell (SMC) grid for global transport. Similar to the reduced grid, the SMC grid relaxes the Courant–Friedrichs–Lewy (CFL) restriction of ...

Jian-Guo Li

2011-05-01T23:59:59.000Z

114

Thermally Driven Flow in a Rotating Spherical Shell: Axisymmetric States  

Science Conference Proceedings (OSTI)

Numerical models are utilized to study a spherical analogue of the rotating annulus experiments modeling atmospheric motion. Motivation for this work is partially provided by NASA's proposal to conduct such an experiment on Spacelab (the ...

Timothy L. Miller; Robert L. Gall

1983-04-01T23:59:59.000Z

115

Application of second generation wavelets to blind spherical deconvolution  

Science Conference Proceedings (OSTI)

We address the problem of spherical deconvolution in a non-parametric statistical framework, where both the signal and the operator kernel are subject to measurement errors. After a preliminary treatment of the kernel, we apply a thresholding procedure ... Keywords: 62G05, 62G99, 65J20, 65J22, Blind deconvolution, Blockwise SVD, Linear inverse problems, Nonparametric adaptive estimation, Second generation wavelets, Spherical deconvolution

T. Vareschi

2014-02-01T23:59:59.000Z

116

Water adsorption on aggregates of spherical aerosol nano particles  

E-Print Network (OSTI)

A three dimensional integral equation is developed in order to compute water adsorption onto aggregates of spherical aerosol nano particles. The integral equation is derived from molecular density functional theory, with a weighted density approximation and a direct correlation function interpolation rule. Only required inputs are the direct correlation functions of the uniform fluid or gas at both high-density and low-density limits. The equation has been tested on argon adsorption onto a graphite planer substrate; the result corresponds well with previous simulation work. Adsorption of both noble gas and water onto a single spherical nano particle and aggregates of spherical nano particles has been computed with the developed equation. For the adsorption of a single spherical substrate, layer structure has been found, the adsorption shows a transition property when substrate size increases and when the substrate size is over 100?? the adsorption is nearly the same as that of a planer substrate. For adsorption of aggregates of spherical nano particles, not only much strong adsorption appears but also adsorption property changes with different configurations of spherical nano particles.

Nie, Chu

2005-08-01T23:59:59.000Z

117

Embedding global barrier and collective in torus network with each node combining input from receivers according to class map for output to senders  

DOE Patents (OSTI)

Embodiments of the invention provide a method, system and computer program product for embedding a global barrier and global interrupt network in a parallel computer system organized as a torus network. The computer system includes a multitude of nodes. In one embodiment, the method comprises taking inputs from a set of receivers of the nodes, dividing the inputs from the receivers into a plurality of classes, combining the inputs of each of the classes to obtain a result, and sending said result to a set of senders of the nodes. Embodiments of the invention provide a method, system and computer program product for embedding a collective network in a parallel computer system organized as a torus network. In one embodiment, the method comprises adding to a torus network a central collective logic to route messages among at least a group of nodes in a tree structure.

Chen, Dong; Coteus, Paul W; Eisley, Noel A; Gara, Alan; Heidelberger, Philip; Senger, Robert M; Salapura, Valentina; Steinmacher-Burow, Burkhard; Sugawara, Yutaka; Takken, Todd E

2013-08-27T23:59:59.000Z

118

Collective neutrino oscillations in non-spherical geometry  

E-Print Network (OSTI)

The rich phenomenology of collective neutrino oscillations has been studied only in one-dimensional or spherically symmetric systems. Motivated by the non-spherical example of coalescing neutron stars, presumably the central engines of short gamma-ray bursts, we use the Liouville equation to formulate the problem for general source geometries. Assuming the neutrino ensemble displays self-maintained coherence, the problem once more becomes effectively one-dimensional along the streamlines of the overall neutrino flux. This approach for the first time provides a formal definition of the ``single-angle approximation'' frequently used for supernova neutrinos and allows for a natural generalization to non-spherical geometries. We study the explicit example of a disk-shaped source as a proxy for coalescing neutron stars.

Basudeb Dasgupta; Amol Dighe; Alessandro Mirizzi; Georg G. Raffelt

2008-05-21T23:59:59.000Z

119

CHARACTERIZATION OF CYCLED SPHERICAL RESORCINOL-FORMALDEHYDE ION EXCHANGE RESIN  

Science Conference Proceedings (OSTI)

This report presents characterization data for two spherical resorcinol-formaldehyde (sRF) resin beds that had processed cesium in non-radioactive and radioactive cycles. All column cycle operations for the resin beds including loading, displacements, elution, regeneration, breakthroughs, and solution analyses are reported in Nash and Duignan, 2009a. That report covered four ion exchange (IX) campaigns using the two {approx}11 mL beds in columns in a lead-lag arrangement. The first two campaigns used Savannah River Site (SRS) Tank 2F nonradioactive simulant while the latter two were fed with actual dissolved salt in the Savannah River National Laboratory (SRNL) Shielded Cells. Both radioactive cycles ran to cesium breakthrough of the lead column. The resin beds saw in excess of 400 bed volumes of feed in each cycle. Resin disposal plans in tank farm processing depend on characterizations of resin used with actual tank feed. Following a final 30 bed volume (BV) elution with nitric acid, the resin beds were found to contain detectable chromium, barium, boron, aluminum, iron, sodium, sulfur, plutonium, cesium, and mercury. Resin affinity for plutonium is important in criticality safety considerations. Cesium-137 was found to be less than 10E+7 dpm/g of resin, similar to past work with sRF resin. Sulfur levels are reasonably consistent with other work and are expected to represent sulfur chemistry used in the resin manufacture. There were low but detectable levels of technetium, americium, and curium. Toxicity Characteristic Leaching Procedure (TCLP) work on the used (eluted) resin samples showed significant contents of mercury, barium, and chromium. One resin sample exceeded the TCLP level for mercury while the other metals were below TCLP levels. TCLP organics measurements indicated measurable benzene in one case, though the source was unknown. Results of this work were compared with other work on similar sRF resin characterizations in this report. This is the first work to quantify mercury on sRF resin. Resin mercury content is important in plans for the disposition of used sRF resin. Mercury speciation in high level waste (HLW) is unknown. It may be partly organic, one example being methyl mercury cation. Further study of the resin's affinity for mercury is recommended.

Nash, C.; Duignan, M.

2010-02-23T23:59:59.000Z

120

Orientational order in concentrated suspensions of spherical microswimmers  

E-Print Network (OSTI)

We use numerical simulations to probe the dynamics of concentrated suspensions of spherical microswimmers interacting hydrodynamically. Previous work in the dilute limit predicted orientational instabilities of aligned suspensions for both pusher and puller swimmers, which we confirm computationally. Unlike previous work, we show that isotropic suspensions of spherical swimmers are also always unstable. Both types of initial conditions develop long-time polar order, of a nature which depends on the hydrodynamic signature of the swimmer but very weakly on the volume fraction up to very high volume fractions.

Arthur A. Evans; Takuji Ishikawa; Takami Yamaguchi; Eric Lauga

2013-02-10T23:59:59.000Z

Note: This page contains sample records for the topic "national spherical torus" 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

Casimir energy of a spherical shell in $?-$Minkowski spacetime  

E-Print Network (OSTI)

We study the Casimir energy of a spherical shell of radius $a$ in $\\kappa$-Minkowski spacetime for a complex field with an asymmetric ordering and obtain the energy up to $O(1/\\kappa^2)$. We show that the vacuum breaks particle and anti-particle symmetry if one requires the spectra to be consistent with the blackbody radiation at the commutative limit.

Hyeong-Chan Kim; Chaiho Rim; Jae Hyung Yee

2007-10-30T23:59:59.000Z

122

Shortcuts to Spherically Symmetric Solutions: A Cautionary Note  

E-Print Network (OSTI)

Spherically symmetric solutions of generic gravitational models are optimally, and legitimately, obtained by expressing the action in terms of the two surviving metric components. This shortcut is not to be overdone, however: a one-function ansatz invalidates it, as illustrated by the incorrect solutions of [1].

S. Deser; J. Franklin; B. Tekin

2004-04-28T23:59:59.000Z

123

All static spherically symmetric anisotropic solutions of Einstein's equations  

Science Conference Proceedings (OSTI)

An algorithm recently presented by Lake to obtain all static spherically symmetric perfect fluid solutions is extended to the case of locally anisotropic fluids (principal stresses unequal). As expected, the new formalism requires the knowledge of two functions (instead of one) to generate all possible solutions. To illustrate the method some known cases are recovered.

Herrera, L.; Di Prisco, A. [Escuela de Fisica, Facultad de Ciencias, Universidad Central de Venezuela, Caracas (Venezuela); Ospino, J. [Area de Fisica Teorica. Facultad de Ciencias, Universidad de Salamanca, Salamanca (Spain)

2008-01-15T23:59:59.000Z

124

Composite spherically symmetric configurations in Jordan-Brans-Dicke theory  

E-Print Network (OSTI)

In this article, a study of the scalar field shells in relativistic spherically symmetric configurations has been performed. We construct the composite solution of Jordan-Brans-Dicke field equation by matching the conformal Brans solutions at each junction surfaces. This approach allows us to associate rigorously with all solutions as a single glued "space", which is a unique differentiable manifold M^4.

S. Kozyrev

2010-09-23T23:59:59.000Z

125

Development of spherical-trailer-type cable reel mechanism  

Science Conference Proceedings (OSTI)

Cabled communication is considered to be more useful than wireless communication for rescue robots used in post-disaster environments. The cable can not only provide good signal communication but also contribute to assist to retrieve the robot. However, ... Keywords: cable oscillating movement, cable reel mechanism, rescue-robot, spatial cam, spherical trailer

Masayuki Arai; Shigeo Hirose

2007-08-01T23:59:59.000Z

126

Two-Component Dust in Spherically Symmetric Motion  

E-Print Network (OSTI)

Two components of spherically symmetric, inhomogeneous dust penetrating each other are introduced as a generalization of the well-known Tolman-Bondi dust solution. The field equations of this model are formulated and general properties are discussed. inhomogeneous Special solutions with additional symmetries - an extra Killing- or homothetic vector - and their matching to the corresponding Tolman-Bondi solution are investigated.

Haager, G

1997-01-01T23:59:59.000Z

127

Two-Component Dust in Spherically Symmetric Motion  

E-Print Network (OSTI)

Two components of spherically symmetric, inhomogeneous dust penetrating each other are introduced as a generalization of the well-known Tolman-Bondi dust solution. The field equations of this model are formulated and general properties are discussed. inhomogeneous Special solutions with additional symmetries - an extra Killing- or homothetic vector - and their matching to the corresponding Tolman-Bondi solution are investigated.

Gernot Haager

1997-05-02T23:59:59.000Z

128

Light Scattering by Quasi-Spherical Ice Crystals  

Science Conference Proceedings (OSTI)

The shapes and single-scattering properties of small, irregular, quasi-spherical ice crystals, with equivalent radii between approximately 8 and 90 ?m and size parameters from about 90 to 1000, are studied using two-dimensional images measured by ...

Timo Nousiainen; Greg M. McFarquhar

2004-09-01T23:59:59.000Z

129

Decay Rates for Spherical Scalar Waves in the Schwarzschild Geometry  

E-Print Network (OSTI)

The Cauchy problem is considered for the scalar wave equation in the Schwarzschild geometry. Using an integral spectral representation we derive the exact decay rate for solutions of the Cauchy problem with spherical symmetric initial data, which is smooth and compactly supported outside the event horizon.

Johann Kronthaler

2007-09-24T23:59:59.000Z

130

ABAREX: A neutron spherical optical-statistical model code  

SciTech Connect

The spherical optical-statistical model is briefly reviewed and the capabilities of the neutron scattering code, ABAREX, are presented. Input files for ten examples, in which neutrons are scattered by various nuclei, are given and the output of each run is discussed in detail.

Lawson, R.D.

1992-06-01T23:59:59.000Z

131

Design, construction and implementation of spherical tissue equivalent proportional counter  

E-Print Network (OSTI)

Tissue equivalent proportional counters (TEPC) are used for medical and space activities whenever a combination of high and low LET (lineal energy transfer) radiations are present. With the frequency and duration of space activities increasing, exposure to fast heavy ions from galactic cosmic radiation and solar events is a major concern. The optimum detector geometry is spherical; to obtain an isotropic response, but simple spherical detectors have the disadvantage of a non-uniform electric field. In order to achieve a uniform electric field along the detector axis, spherical tissue equivalent proportional counters have been designed with different structures to modify the electric field. Some detectors use a cylindrical coil that is coaxial with the anode, but they are not reliable because of their sensitivity to microphonic noise and insufficient mechanical strength. In this work a new spherical TEPC was developed. The approach used was to divide the cathode in several rings with different thicknesses, and adjust the potential difference between each ring and the anode to produce an electric field that is nearly constant along the length of the anode. A-150 tissue equivalent plastic is used for the detector walls, the insulator material between the cathode rings is low density polyethylene, and the gas inside the detector is propane. The detector, along with the charge sensitive preamplifier, is encased in a stainless steel vacuum chamber. The gas gain was found to be 497.5 at 782 volts and the response to neutrons as a function of angle was constant ±7%. This spherical tissue equivalent proportional counter detector system will improve the accuracy of dosimetry in space, and as a result improve radiation safety for astronauts.

Perez Nunez, Delia Josefina

2008-05-01T23:59:59.000Z

132

Making of the NSTX Facility  

SciTech Connect

The NSTX (National Spherical Torus Experiment) facility located at Princeton Plasma Physics Laboratory is the newest national fusion science experimental facility for the restructured US Fusion Energy Science Program. The NSTX project was approved in Fy 97 as the first proof-of-principle national fusion facility dedicated to the spherical torus research. On Feb. 15, 1999, the first plasma was achieved 10 weeks ahead of schedule. The project was completed on budget and with an outstanding safety record. This paper gives an overview of the NSTX facility construction and the initial plasma operations.

Ono, M. [Princeton Plasma Physics Laboratory (PPPL); Peng, Yueng Kay Martin [ORNL

1999-01-01T23:59:59.000Z

133

Thermal Performance of Poly Alpha Olefin Nanofluid with Spherical and Non-spherical Nanoparticles  

E-Print Network (OSTI)

Research on nanofluids has been undertaken for several years because of the reported enhancements of thermal properties such as thermal conductivity and enhanced heat transfer performance in laminar flow. Nanofluid is the fluid where nanoparticles are dispersed in a base fluid. Thermal conductivity and viscosity are considered to be the most prominent factors in the efficient use of nanofluids. A change in thermal conductivity and viscosity also changes the convective heat transfer coefficient. Nanoparticles can be metallic or non-metallic and also can have different shapes. In this study, Poly-Alpha-Olefin (PAO) has been used as a base fluid with Alumina (Al2O3) nanoparticles. Poly-Alpha-Olefin is commonly used for engine lubrication in military applications and cooling in electronic and industrial devices. Several nanofluid samples were made by METSS Corp. in Ohio, USA using different dispersants, different base fluids and different morphology of alumina nanoparticles. The mass fraction of nanoparticles is from 2.5 to 20 percent. The thermal properties of each sample such as thermal conductivity and viscosity have been measured. Thermal conductivity of nanofluids and pure base fluids were both measured and the thermal conductivity enhancement has been calculated. Also, the heat transfer coefficient has been determined for laminar flow under constant heat flux conditions. Results indicate that all the tested nanofluids and base fluid samples show a Newtonian behavior. Among the nanofluid samples, NF-048, which contains non-spherical Alumina nanoparticles exhibits the greatest thermal conductivity enhancement when compared to pure PAO. Heat transfer tests were conducted with pure PAO and NF-048, and an enhancement in convective heat transfer coefficient was observed. The thermal conductivity of NF-048 increases with temperature, which is consistent with heat transfer results. Furthermore, the percentage enhancement in convective heat transfer coefficient was shown to increase non-linearly with the axial distance in the heat transfer section. NF-048 exhibits a lower Re (Reynolds number)*Ra (Rayleigh number) than pure PAO under laminar flow constant heat flux conditions indicating that nanoparticle morphology and composition are the two main factors responsible for convective heat transfer enhancement at low Reynolds number.

Park, Chan Hyun

2011-05-01T23:59:59.000Z

134

The Spherical Harmonics Discrete Ordinate Method for Three-Dimensional Atmospheric Radiative Transfer  

Science Conference Proceedings (OSTI)

A new algorithm for modeling radiative transfer in inhomogeneous three-dimensional media is described. The spherical harmonics discrete ordinate method uses a spherical harmonic angular representation to reduce memory use and time computing the ...

K. Franklin Evans

1998-02-01T23:59:59.000Z

135

Four-Stream Spherical Harmonic Expansion Approximation for Solar Radiative Transfer  

Science Conference Proceedings (OSTI)

This paper presents a four-stream extension of the ?-Eddington approximation by considering the higher-order spherical harmonic expansion in radiative intensity. By using the orthogonality relation of the spherical harmonic functions, the ...

J. Li; V. Ramaswamy

1996-04-01T23:59:59.000Z

136

The Vector Harmonic Transform Method for Solving Partial Differential Equations in Spherical Geometry  

Science Conference Proceedings (OSTI)

The development of computational methods for solving partial differential equations in spherical geometry is complicated by problems induced by the spherical coordinate system itself. Even though the solution is smooth in Cartesian coordinates, ...

Paul N. Swarztrauber

1993-12-01T23:59:59.000Z

137

High-sensitive sensor of dopamine based on photoluminescence quenching of hierarchical CdS spherical aggregates  

Science Conference Proceedings (OSTI)

Hierarchical CdS spherical aggregates have been fabricated by an assembling strategy starting from nanoparticles, which opens a general way to obtain hierarchical spherical aggregates of different types of materials. The hierarchical CdS spherical aggregates ...

Binjie Sun, Changzheng Wang

2012-01-01T23:59:59.000Z

138

Multiple spherically converging shock waves in liquid deuterium  

Science Conference Proceedings (OSTI)

To achieve ignition, inertial confinement fusion target designs use a sequence of shocks to compress the target before it implodes. To minimize the entropy acquired by the fuel, the strength and timing of these shocks will be precisely set during a series of tuning experiments that adjust the laser pulse to achieve optimal conditions. We report measurements of the velocity and timing of multiple, converging shock waves inside spherical targets filled with liquid (cryogenic) deuterium. These experiments produced the highest reported shock velocity observed in liquid deuterium (U{sub s} = 135 km/s at {approx}25 Mb) and observed an increase in shock velocity due to spherical convergence. These direct-drive experiments are best simulated when hydrodynamic codes use a nonlocal model for the transport of absorbed laser energy from the coronal plasma to the ablation surface.

Boehly, T. R.; Goncharov, V. N.; Seka, W.; Hu, S. X.; Marozas, J. A. [Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14423-1299 (United States); Meyerhofer, D. D. [Laboratory for Laser Energetics and Departments of Mechanical Engineering and Physics, University of Rochester, Rochester, New York 14627 (United States); Celliers, P. M.; Hicks, D. G.; Barrios, M. A.; Fratanduono, D.; Collins, G. W. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

2011-09-15T23:59:59.000Z

139

Equilibrium spherically curved 2D Lennard-Jones systems  

E-Print Network (OSTI)

To learn about basic aspects of nano-scale spherical molecular shells during their formation, spherically curved two-dimensional N-particle Lennard-Jones systems are simulated, studying curvature evolution paths at zero-temperature. For many N-values (N<800) equilibrium configurations are traced as a function of the curvature radius R. Sharp jumps for tiny changes in R between trajectories with major differences in topological structure correspond to avalanche-like transitions. For a typical case, N=25, equilibrium configurations fall on smooth trajectories in state space which can be traced in the E-R plane. The trajectories show-up with local energy minima, from which growth in N at steady curvature can develop.

J. M. Voogd; P. M. A. Sloot; R. van Dantzig

2005-07-06T23:59:59.000Z

140

Self-similar spherical shock solution with sustained energy injection  

E-Print Network (OSTI)

We present the generalization of the Sedov-Taylor self-similar strong spherical shock solution for the case of a central energy source varying in time, $E=A t^k$, where $A$ and $k$ are constants. The known Sedov-Taylor solution corresponds to a particular adiabatic case of $k=0$ or \\emph{instant shock} with an instant energy source of the shock, $E=A$. The self-similar hydrodynamic flow in the nonadiabatic $k\

V. I. Dokuchaev

2002-09-17T23:59:59.000Z

Note: This page contains sample records for the topic "national spherical torus" 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

Spherical Resorcinol-Formaldehyde Synthesis by Inverse Suspension Polymerization  

SciTech Connect

Base catalyzed sol-gel polycondensation of resorcinol (1,3-dihydroxybenzene) with formaldehyde by inverse suspension polymerization leads to the formation of uniform, highly cross-linked, translucent, spherical gels, which have increased selectivity and capacity for cesium ion removal from high alkaline solutions. Because of its high selectivity for cesium ion, resorcinol-formaldehyde (R-F) resins are being considered for process scale column radioactive cesium removal by ion-exchange at the Waste Treatment and Immobilization Plant (WTP), which is now under construction at the Hanford site. Other specialty resins such as Superlig{reg_sign} 644 have been ground and sieved and column tested for process scale radioactive cesium removal but show high pressure drops across the resin bed during transition from column regeneration to loading and elution. Furthermore, van Deemter considerations indicate better displacement column chromatography by the use of spherical particle beads rather than irregularly shaped ground or granular particles. In our studies batch contact equilibrium experiments using a high alkaline simulant show a definite increase in cesium loading onto spherical R-F resin. Distribution coefficient (Kd) values ranged from 777 to 429 mL/g in the presence of 0.1M and 0.7M potassium ions, respectively. Though other techniques for making R-F resins have been employed, to our knowledge no one has made spherical R-F resins by inverse suspension polymerization. Moreover, in this study we discuss the data comparisons to known algebraic isotherms used to evaluate ion-exchange resins for WTP plant scale cesium removal operations.

Ray, Robert J.; Scrivens, Walter A.; Nash, Charles

2005-10-21T23:59:59.000Z

142

Revised spherically symmetric solutions of $R+\\varepsilon/R$ gravity  

E-Print Network (OSTI)

We study spherically symmetric static empty space solutions in $R+\\varepsilon/R$ model of $f(R)$ gravity. We show that the Schwarzschild metric is an exact solution of the resulted field equations and consequently there are general solutions which {are perturbed Schwarzschild metric and viable for solar system. Our results for large scale contains a logarithmic term with a coefficient producing a repulsive gravity force which is in agreement with the positive acceleration of the universe.

Kh. Saaidi; S. W. Rabiei; A. Aghamohammadi

2011-12-31T23:59:59.000Z

143

Dust Static Spherically Symmetric Solution in $f(R)$ Gravity  

E-Print Network (OSTI)

In this paper, we take dust matter and investigate static spherically symmetric solution of the field equations in metric f(R) gravity. The solution is found with constant Ricci scalar curvature and its energy distribution is evaluated by using Landau-Lifshitz energy-momentum complex. We also discuss the stability condition and constant scalar curvature condition for some specific popular choices of f(R) models in addition to their energy distribution.

Muhammad Sharif; Hafiza Rizwana Kausar

2011-02-21T23:59:59.000Z

144

The gravitation energy for a cylindrically and spherically symmetrical system  

E-Print Network (OSTI)

It has been shown that t00 component of the energy-momentum pseudotensor in the case of cylindrically symmetrical static gravitational field cannot be interpreted as energy density of the gravitation field. An approach has been suggested allows one to express the energy density of the cylindrically or spherically symmetrical static gravitation field in terms of the metric tensor components. The approach based on the consideration of the process of isothermal compression of a cylinder consisted of incoherent matter.

Roald Sosnovskiy

2005-07-04T23:59:59.000Z

145

TDHF fusion calculations for spherical+deformed systems  

E-Print Network (OSTI)

We outline a formalism to carry out TDHF calculations of fusion cross sections for spherical + deformed nuclei. The procedure incorporates the dynamic alignment of the deformed nucleus into the calculation of the fusion cross section. The alignment results from multiple E2/E4 Coulomb excitation of the ground state rotational band. Implications for TDHF fusion calculations are discussed. TDHF calculations are done in an unrestricted three-dimensional geometry using modern Skyrme force parametrizations.

A. S. Umar; V. E. Oberacker

2006-04-04T23:59:59.000Z

146

Events trigger generator for resonant spherical detectors of gravitational waves  

E-Print Network (OSTI)

We have set up and tested a pipeline for processing the data from a spherical gravitational wave detector with six transducers. The algorithm exploits the multichannel capability of the system and provides a list of candidate events with their arrival direction. The analysis starts with the conversion of the six detector outputs into the scalar and the five quadrupolar modes of the sphere, which are proportional to the corresponding gravitational wave spherical components. Event triggers are then generated by an adaptation of the WaveBurst algorithm. Event validation and direction reconstruction are made by cross-checking two methods of different inspiration: geometrical (lowest eigenvalue) and probabilistic (maximum likelihood). The combination of the two methods is able to keep substantially unaltered the efficiency and can reduce drastically the detections of fake events (to less than ten per cent). We show a quantitative test of these ideas by simulating the operation of the resonant spherical detector miniGRAIL, whose planned sensitivity in its frequency band (few hundred Hertz's around 3 kHz) is comparable with the present LIGO one.

Stefano Foffa; Riccardo Sturani

2008-05-06T23:59:59.000Z

147

A Compact Torus Fusion Reactor Utilizing a Continuously Generated Strings of CT's. The CT String Reactor, CTSR.  

Science Conference Proceedings (OSTI)

A fusion reactor is described in which a moving string of mutually repelling compact toruses (alternating helicity, unidirectional Btheta) is generated by repetitive injection using a magnetized coaxial gun driven by continuous gun current with alternating poloidal field. An injected CT relaxes to a minimum magnetic energy equilibrium, moves into a compression cone, and enters a conducting cylinder where the plasma is heated to fusion-producing temperature. The CT then passes into a blanketed region where fusion energy is produced and, on emergence from the fusion region, the CT undergoes controlled expansion in an exit cone where an alternating poloidal field opens the flux surfaces to directly recover the CT magnetic energy as current which is returned to the formation gun. The CT String Reactor (CTSTR) reactor satisfies all the necessary MHD stability requirements and is based on extrapolation of experimentally achieved formation, stability, and plasma confinement. It is supported by extensive 2D, MHD calculations. CTSTR employs minimal external fields supplied by normal conductors, and can produce high fusion power density with uniform wall loading. The geometric simplicity of CTSTR acts to minimize initial and maintenance costs, including periodic replacement of the reactor first wall.

Hartman, C W; Reisman, D B; McLean, H S; Thomas, J

2007-05-30T23:59:59.000Z

148

Simulation of blasting induced rock motion using spherical element models  

SciTech Connect

Control of the rock motion associated with blasting can have significant economic benefits. For example, surface coal mining can be made more efficient if the overburden material can be cast further with explosives, leaving less work for mechanical equipment. The final muck pile shape in very type of surface and underground blasting is controlled by the blasting induced motion of the rock. A theoretically sound method of predicting rock motion will be beneficial to understanding the blasting process. Discrete element methods have been used for some time to predict rock motion resulting from blasting. What all of these approaches had in common was the use of polygonal elements with corners and sides as well as aspect ratio. Reasonably good results were obtained but treatment of the interactions of the corners and sides of elements was a computationally intensive process that made long simulations with many elements expensive to perform. The use of spherical elements showed increased efficiency but lacked the mechanisms for treating the bulking of the rock mass. The computer program developed was converted from an explicit code to an event-driven code and some bulking mechanisms were added that allowed spherical elements to exert a torque on other spherical elements with which contact was made. The architecture of this program and its event-driven nature made it difficult to vectorize for efficient execution on vector processing machines. A new code called DMC (Distinct Motion Code) has been developed this past year. DMC was designed and written especially to take advantage of super computer vector processing capabilities. This paper will discuss the use of DMC to perform accurate rock motion calculations with very reasonable computation times. 9 refs., 7 figs., 3 tabs.

Taylor, L.M.; Preece, D.S. (Hibbitt, Karlsson and Sorensen, Providence, RI (USA); Sandia National Labs., Albuquerque, NM (USA))

1989-01-01T23:59:59.000Z

149

Spherical Thin-Shell Wormholes and Modified Chaplygin Gas  

E-Print Network (OSTI)

The purpose of this paper is to construct spherical thin-shell wormhole solutions through cut and paste technique and investigate the stability of these solutions in the vicinity of modified Chaplygin gas. The Darmois-Israel formalism is used to formulate the stresses of the surface concentrating the exotic matter. We explore the stability of the wormhole solutions by using the standard potential method. We conclude that there exist more stable as well as unstable solutions than the previous study with generalized Chaplygin gas \\cite{15}.

M. Sharif; M. Azam

2013-09-28T23:59:59.000Z

150

Remark on: the neutron spherical optical-model absorption.  

SciTech Connect

The energy-dependent behavior of the absorption term of the spherical neutron optical potential for doubly magic {sup 208}Pb and the neighboring {sup 209}Bi is examined. These considerations suggest a phenomenological model that results in an intuitively attractive energy dependence of the imaginary potential that provides a good description of the observed neutron cross sections and that is qualitatively consistent with theoretical concepts. At the same time it provides an alternative to some of the arbitrary assumptions involved in many conventional optical-model interpretations reported in the literature and reduces the number of the parameters of the model.

Smith, A. B.; Nuclear Engineering Division

2007-06-30T23:59:59.000Z

151

A non-conforming 3D spherical harmonic transport solver  

Science Conference Proceedings (OSTI)

A new 3D transport solver for the time-independent Boltzmann transport equation has been developed. This solver is based on the second-order even-parity form of the transport equation. The angular discretization is performed through the expansion of the angular neutron flux in spherical harmonics (PN method). The novelty of this solver is the use of non-conforming finite elements for the spatial discretization. Such elements lead to a discontinuous flux approximation. This interface continuity requirement relaxation property is shared with mixed-dual formulations such as the ones based on Raviart-Thomas finite elements. Encouraging numerical results are presented. (authors)

Van Criekingen, S. [Commissariat a l'Energie Atomique CEA-Saclay, DEN/DM2S/SERMA/LENR Bat 470, 91191 Gif-sur-Yvette, Cedex (France)

2006-07-01T23:59:59.000Z

152

Shearing expansion-free spherical anisotropic fluid evolution  

Science Conference Proceedings (OSTI)

Spherically symmetric expansion-free distributions are systematically studied. The entire set of field equations and junction conditions are presented for a general distribution of dissipative anisotropic fluid (principal stresses unequal), and the expansion-free condition is integrated. In order to understand the physical meaning of expansion-free motion, two different definitions for the radial velocity of a fluid element are discussed. It is shown that the appearance of a cavity is inevitable in the expansion-free evolution. The nondissipative case is considered in detail, and the Skripkin model is recovered.

Herrera, L. [Escuela de Fisica, Facultad de Ciencias, Universidad Central de Venezuela, Caracas (Venezuela, Bolivarian Republic of); Santos, N. O. [School of Mathematical Sciences, Queen Mary, University of London, London E1 4NS (United Kingdom); Laboratorio Nacional de Computacao Cientifica, 25651-070 Petropolis RJ (Brazil); Wang Anzhong [GCAP-CASPER, Department of Physics, Baylor University, Waco, Texas 76798-7316 (United States); Department of Theoretical Physics, State University of Rio de Janeiro, RJ (Brazil)

2008-10-15T23:59:59.000Z

153

ECCENTRIC ROLLING OF POWDER AND BONDING AGENT INTO SPHERICAL PELLETS  

DOE Patents (OSTI)

A machine is described for pelletizing powder and bonding agent into spherical pellets of high density and uniform size. In this device, the material to be compacted is added to a flat circular pan which is moved in a circular orbit in a horizontal plane about an axis displaced from that of the pan's central axis without rotating the pan about its central axis. This movement causes the material contained therein to roll around the outside wall of the container and build up pellets of uniform shape, size, and density.

Patton, G. Jr.; Zirinsky, S.

1961-06-01T23:59:59.000Z

154

Photoionization of hydrogenlike ions surrounded by a charged spherical shell  

Science Conference Proceedings (OSTI)

Within the framework of a model of a hollow atom as a hydrogenlike multicharged ion located at the center of a spherical shell formed by highly excited electrons, the photoionization cross sections of the inner 1s level of the ion have been calculated. The results show that the existence of the outer electronic shell of the hollow atom results in oscillations in the energy dependence of the photoionization cross section. It has been demonstrated also that the photoionization cross section as a function of photon energy is extremely sensitive to the magnitude of the discontinuity of the electric field at the surface of the outer electronic shell.

Baltenkov, A. S. [Arifov Institute of Electronics, 100125, Tashkent (Uzbekistan); Manson, S. T. [Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303 (United States); Msezane, A. Z. [Center for Theoretical Studies of Physical Systems, Clark Atlanta University, Atlanta, Georgia 30314 (United States)

2007-10-15T23:59:59.000Z

155

Optimal strategy for controlling linewidth on spherical focal surface arrays  

Science Conference Proceedings (OSTI)

We present a method for patterning concave spherical substrates based on ion beam proximity lithography. The approach overcomes both the distortion and radial dose variation that are inherent to projecting a flat mask pattern onto a sphere. We use a self-complementary mask (SCM) concept where an array of discrete ion beamlets is scanned across the substrate to expose the circuit pattern. This scanning is implemented by varying the inclination of the incident ion beam with respect to the mask. Pincushion distortion is corrected by applying a global transformation to the centers of the SCM openings while a local transformation

P. Ruchhoeft; J. C. Wolfe

2000-01-01T23:59:59.000Z

156

National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Laboratories Los Alamos National Laboratory (the Laboratory) is one of 17 National Laboratories in the United States and is one of the two located in New Mexico. The Laboratory has...

157

NATIONAL CONFERENCE  

Science Conference Proceedings (OSTI)

... Oak Room ... of the Secretariats, the US National Work Groups ... the continued cooperation with the International Laboratory Accreditation Cooperation ...

2010-12-17T23:59:59.000Z

158

The quantum free particle on spherical and hyperbolic spaces: A curvature dependent approach. II  

Science Conference Proceedings (OSTI)

This paper is the second part of a study of the quantum free particle on spherical and hyperbolic spaces by making use of a curvature-dependent formalism. Here we study the analogues, on the three-dimensional spherical and hyperbolic spaces, S{sub {kappa}}{sup 3} ({kappa} > 0) and H{sub k}{sup 3} ({kappa} < 0), to the standard spherical waves in E{sup 3}. The curvature {kappa} is considered as a parameter and for any {kappa} we show how the radial Schroedinger equation can be transformed into a {kappa}-dependent Gauss hypergeometric equation that can be considered as a {kappa}-deformation of the (spherical) Bessel equation. The specific properties of the spherical waves in the spherical case are studied with great detail. These have a discrete spectrum and their wave functions, which are related with families of orthogonal polynomials (both {kappa}-dependent and {kappa}-independent), and are explicitly obtained.

Carinena, Jose F.; Ranada, Manuel F. [Departamento de Fisica Teorica and IUMA, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza (Spain); Santander, Mariano [Departamento de Fisica Teorica, Facultad de Ciencias, Universidad de Valladolid, 47011 Valladolid (Spain)

2012-10-15T23:59:59.000Z

159

Application Of A Spherical-Radial Heat Transfer Model To Calculate...  

Open Energy Info (EERE)

Application Of A Spherical-Radial Heat Transfer Model To Calculate Geothermal Gradients From Measurements In Deep Boreholes Jump to: navigation, search GEOTHERMAL ENERGYGeothermal...

160

A Comparison of Grid Quality of Optimized Spherical Hexagonal–Pentagonal Geodesic Grids  

Science Conference Proceedings (OSTI)

Construction and optimization methods of spherical hexagonal–pentagonal geodesic grids are investigated. The objective is to compare grid structures on common ground.

Hiroaki Miura; Masahide Kimoto

2005-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "national spherical torus" 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

Hamiltonian spacetime dynamics with a spherical null-dust shell  

E-Print Network (OSTI)

We consider the Hamiltonian dynamics of spherically symmetric Einstein gravity with a thin null-dust shell, under boundary conditions that fix the evolution of the spatial hypersurfaces at the two asymptotically flat infinities of a Kruskal-like manifold. The constraints are eliminated via a Kuchar-type canonical transformation and Hamiltonian reduction. The reduced phase space $\\tilde\\Gamma$ consists of two disconnected copies of $R^4$, each associated with one direction of the shell motion. The right-moving and left-moving test shell limits can be attached to the respective components of right-hand-side and left-hand-side masses as configuration variables provides a global canonical chart on each component of $\\tilde\\Gamma$, and renders the Hamiltonian simple, but encodes the shell dynamics in the momenta in a convoluted way. Choosing the shell curvature radius and the "interior" mass as configuration variables renders the shell dynamics transparent in an arbitrarily specifiable stationary gauge "exterior" ...

Louko, J; Friedman, J L; Louko, Jorma; Whiting, Bernard F.; Friedman, John L.

1998-01-01T23:59:59.000Z

162

Coherent scattering by a spherical medium of resonant atoms  

Science Conference Proceedings (OSTI)

We consider the problem of coherent resonant scattering of electromagnetic waves by a spherical medium of two-level atoms. The frequency dependence of the scattering amplitudes and cross sections reveals a complex structure of narrow peaks and dips. We relate these scattering resonances to the cooperative emission resonances characteristic of a sphere. We find the scattering to show considerable interference between the electric and magnetic multipole contributions, particularly in the lower multipole orders. This interference tends to enhance anisotropies in the differential scattering cross section even for small spheres. For such spheres, the peak values of the resonant contributions of the low-order multipoles to the total scattering cross section can increase with multipole order, in contrast to the usual decrease seen in nonresonant scattering.

Prasad, Sudhakar; Glauber, Roy J. [Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States); Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States)

2011-06-15T23:59:59.000Z

163

Reactive self-heating model of aluminum spherical nanoparticles  

E-Print Network (OSTI)

Aluminum-oxygen reaction is important in many highly energetic, high pressure generating systems. Recent experiments with nanostructured thermites suggest that oxidation of aluminum nanoparticles occurs in a few microseconds. Such rapid reaction cannot be explained by a conventional diffusion-based mechanism. We present a rapid oxidation model of a spherical aluminum nanoparticle, using Cabrera-Mott moving boundary mechanism, and taking self-heating into account. In our model, electric potential solves the nonlinear Poisson equation. In contrast with the Coulomb potential, a "double-layer" type solution for the potential and self-heating leads to enhanced oxidation rates. At maximal reaction temperature of 2000 C, our model predicts overall oxidation time scale in microseconds range, in agreement with experimental evidence.

Karen S. Martirosyan; Maxim Zyskin

2012-12-17T23:59:59.000Z

164

Improved first order mean spherical approximation for simple fluids  

E-Print Network (OSTI)

A perturbation approach based on the first-order mean spherical approximation (FMSA) is proposed. It consists in adopting a hard-sphere plus short-range attractive Yukawa fluid as the novel reference system, over which the perturbative solution of the Ornstein-Zernike equation is performed. A choice of the optimal range of the reference attraction is discussed. The results are compared against conventional FMSA/HS theory and Monte-Carlo simulation data for compressibility factor and vapor-liquid phase diagrams of the medium-ranged Yukawa fluid. Proposed theory keeps the same level of simplicity and transparency, as the conventional FMSA/HS approach does, but shows to be more accurate.

S. Hlushak; A. Trokhymchuk; I. Nezbeda

2012-02-20T23:59:59.000Z

165

National Report  

Science Conference Proceedings (OSTI)

... A methodology for grade calculation and a glossary of terms can be found at the back, along with the 2013 National Scorecard. ... Category Glossary ...

2013-07-29T23:59:59.000Z

166

Observation of lines above 2000 A in O VIII and C VI in the Princeton Large Torus due to charge-exchange processes: Diagnostic applications  

DOE Green Energy (OSTI)

Hydrogenlike oxygen and carbon lines from transitions (..delta..n = 1) between levels of high principal quantum number n, with wavelengths above 2000 A have been observed. Observations of such transitions were possible due to charge-exchange processes during neutral beam injection of hydrogen atoms into the Princeton Large Torus tokamak. The lines are O VIII 2976 A (8--7 transitions), C VI 3434 A (7--6), and C VI 5291 A (8--7). Application of these lines for ion temperature measurements and initial observations of neutral beam vertical distributions in the plasma are presented.

Suckewer, S.; Skinner, C.H.; Stratton, B.; Bell, R.; Cavallo, A.; Hosea, J.; Hwang, D.; Schilling, G.

1984-08-01T23:59:59.000Z

167

Fire Safety Tests for Spherical Resorcinol Formaldehyde Resin: Data Summary Report  

SciTech Connect

A draft safety evaluation of the scenario for spherical resorcinol-formaldehyde (SRF) resin fire inside the ion exchange column was performed by the Hanford Tank Waste Treatment and Immobilization Plant (WTP) Fire Safety organization. The result of this draft evaluation suggested a potential change of the fire safety classification for the Cesium Ion Exchange Process System (CXP) emergency elution vessels, equipment, and piping, which may be overly bounding based on the fire performance data from the manufacturer of the ion exchange resin selected for use at the WTP. To resolve this question, the fire properties of the SRF resin were measured by Southwest Research Institute (SwRI), following the American Society for Testing and Materials (ASTM) standard procedures, through a subcontract managed by Pacific Northwest National Laboratory (PNNL). For some tests, the ASTM standard procedures were not entirely appropriate or practical for the SRF resin material, so the procedures were modified and deviations from the ASTM standard procedures were noted. This report summarizes the results of fire safety tests performed and reported by SwRI. The efforts by PNNL were limited to summarizing the test results provided by SwRI into one consolidated data report. All as-received SwRI reports are attached to this report in the Appendix. Where applicable, the precision and bias of each test method, as given by each ASTM standard procedure, are included and compared with the SwRI test results of the SRF resin.

Kim, Dong-Sang; Peterson, Reid A.; Schweiger, Michael J.

2012-07-30T23:59:59.000Z

168

Fire Safety Tests for Cesium-Loaded Spherical Resorcinol Formaldehyde Resin: Data Summary Report  

SciTech Connect

A draft safety evaluation of the scenario for spherical resorcinol formaldehyde (SRF) resin fire inside the ion exchange column was performed by the Hanford Tank Waste Treatment and Immobilization Plant (WTP) Fire Safety organization. The result of this draft evaluation suggested a potential change of the fire safety classification for the Cesium Ion Exchange Process System (CXP) emergency elution vessels, equipment, and piping. To resolve this question, the fire properties of the SRF resin were measured by Southwest Research Institute (SwRI) through a subcontract managed by Pacific Northwest National Laboratory (PNNL). The results of initial fire safety tests on the SRF resin were documented in a previous report (WTP-RPT-218). The present report summarizes the results of additional tests performed by SwRI on the cesium-loaded SRF resin. The efforts by PNNL were limited to summarizing the test results provided by SwRI into one consolidated data report. The as-received SwRI report is attached to this report in the Appendix A. Where applicable, the precision and bias of each test method, as given by each American Society for Testing and Materials (ASTM) standard procedure, are included and compared with the SwRI test results of the cesium-loaded SRF resin.

Kim, Dong-Sang; Schweiger, Michael J.; Peterson, Reid A.

2012-09-01T23:59:59.000Z

169

A comparison of high-order time integrators for thermal convection in rotating spherical shells  

Science Conference Proceedings (OSTI)

A numerical study of several time integration methods for solving the three-dimensional Boussinesq thermal convection equations in rotating spherical shells is presented. Implicit and semi-implicit time integration techniques based on backward differentiation ... Keywords: Backward differentiation-extrapolation formulae, Krylov methods, Spectral methods, Spherical shells, Thermal convection, Time integration methods

F. Garcia; M. Net; B. García-Archilla; J. Sánchez

2010-10-01T23:59:59.000Z

170

Electron correlation in a hard spherical external potential: Wigner molecule formation and hybridization  

E-Print Network (OSTI)

Electron correlation in a hard spherical external potential: Wigner molecule formation; published 12 May 2004 We study a model of N electrons confined to a hard spherical box of radius R, for N 3, and is a generalization of recent work on the corresponding two-electron system.1­3 The box acts as a hard wall to confine

Alavi, Ali

171

An efficient numerical method for the onset of blast waves generated by spherical detonation  

Science Conference Proceedings (OSTI)

Blast wave, generated by a high detonating spherical charge, is modeled using the Euler equations. The problem is split into two parts. The first part makes use of the isotropy to solve the problem in spherical radial coordinate. Overpressure distribution ... Keywords: Cartesian methods, blast wave, remapping techniques

Adel M. Benselama; Mame J. P. William-Louis; François Monnoyer

2008-11-01T23:59:59.000Z

172

A modified Tikhonov regularization method for a spherically symmetric three-dimensional inverse heat conduction problem  

Science Conference Proceedings (OSTI)

This paper deals with a spherically symmetric three-dimensional inverse heat conduction problem of determining the internal surface temperature distribution of a hollow sphere from the measured data at a fixed location inside it. This is an ill-posed ... Keywords: Error estimate, Ill-posed problem, Regularization, Spherically symmetric inverse heat conduction problem

Wei Cheng; Chu-Li Fu; Zhi Qian

2007-07-01T23:59:59.000Z

173

Dynamics of quasi-spherical Z-pinch implosions with mass redistribution and displacement modification  

Science Conference Proceedings (OSTI)

Implosions of (quasi-)spherical loads with mass redistribution and displacement modification are investigated numerically. Both methods can theoretically counterbalance the nonuniformity of magnetic pressure along the load surface and realize quasi-spherical Z-pinch implosions. Mass redistribution is feasible for spherical loads with large radius and weight, while the displacement modification is more suitable for light loads, such as those composed of wire arrays. Simulation results suggest that, for mass redistributed spherical loads, wall instabilities induced by polar mass flows will deform the imploding shell. For prolate spherical loads, in which the wall instability cannot develop, the kinetic energy distribution is disturbed at high latitude. These passive behaviors and their possible mitigation methods, such as reshaping the electrode, are investigated numerically in this paper.

Zhang Yang [Institute of Applied Physics and Computational Mathematics, P. O. Box 8009-09, Beijing 100094 (China); Institute of Nuclear Physics and Chemistry, P. O. Box 919-212, Mianyang 621900 (China); Ding Ning; Sun Shunkai; Xue Chuang; Ning Cheng; Xiao Delong; Huang Jun [Institute of Applied Physics and Computational Mathematics, P. O. Box 8009-09, Beijing 100094 (China); Li Zhenghong [Institute of Nuclear Physics and Chemistry, P. O. Box 919-212, Mianyang 621900 (China)

2012-12-15T23:59:59.000Z

174

TORUS: Theory of Reactions for Unstable iSotopes Annual Continuation and Progress Report Year-2: March 1, 2011 - February 29, 2012  

SciTech Connect

The TORUS collaboration derives its name from the research it focuses on, namely the Theory of Reactions for Unstable iSotopes. It is a Topical Collaboration in Nuclear Theory, and funded by the Nuclear Theory Division of the Office of Nuclear Physics in the Office of Science of the Department of Energy. The funding supports one postdoctoral researcher for the years 1 through 3. The collaboration brings together as Principal Investigators a large fraction of the nuclear reaction theorists currently active within the USA. The mission of the TORUS Topical Collaboration is to develop new methods that will advance nuclear reaction theory for unstable isotopes by using three-body techniques to improve direct-reaction calculations, and, by using a new partial-fusion theory, to integrate descriptions of direct and compound-nucleus reactions. This multi-institution collaborative effort is directly relevant to three areas of interest: the properties of nuclei far from stability; microscopic studies of nuclear input parameters for astrophysics, and microscopic nuclear reaction theory.

Arbanas, G; Elster, C; Escher, J; Mukhamedzanov, A; Nunes, F; Thompson, I J

2012-02-24T23:59:59.000Z

175

Ramp-up of CHI Initiated Plasmas on NSTX  

SciTech Connect

Experiments on the National Spherical Torus (NSTX) have now demonstrated flux savings using transient coaxial helicity injection (CHI). In these discharges, the discharges initiated by CHI are ramped up with an inductive transformer and exhibit higher plasma current than discharges without the benefit of CHI initiation.

Mueller, D; Bell, R E; LeBlanc, B; Roquemore, A L; Raman, R; Jarboe, T R; Nelson, B A

2009-10-29T23:59:59.000Z

176

Local Casimir energies for a thin spherical shell  

SciTech Connect

The local Casimir energy density for a massless scalar field associated with step-function potentials in a 3+1 dimensional spherical geometry is considered. The potential is chosen to be zero except in a shell of thickness {delta}, where it has height h, with the constraint h{delta}=1. In the limit of zero thickness, an ideal {delta}-function shell is recovered. In this limit, the behavior of the energy density as the surface of the shell is approached is studied in both the strong and weak coupling regimes. The former case corresponds to the well-known Dirichlet shell limit. New results, which shed light on the nature of surface divergences and on the energy contained within the shell, are obtained in the weak coupling limit, and for a shell of finite thickness. In the case of zero thickness, the energy has a contribution not only from the local energy density, but from an energy term residing entirely on the surface. It is shown that the latter coincides with the integrated local energy density within the shell. We also study the dependence of local and global quantities on the conformal parameter. In particular new insight is provided on the reason for the divergence in the global Casimir energy in third order in the coupling.

Cavero-Pelaez, Ines; Milton, Kimball A.; Wagner, Jeffrey [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019-2061 (United States)

2006-04-15T23:59:59.000Z

177

Nonadiabatic charged spherical evolution in the postquasistatic approximation  

Science Conference Proceedings (OSTI)

We apply the postquasistatic approximation, an iterative method for the evolution of self-gravitating spheres of matter, to study the evolution of dissipative and electrically charged distributions in general relativity. The numerical implementation of our approach leads to a solver which is globally second-order convergent. We evolve nonadiabatic distributions assuming an equation of state that accounts for the anisotropy induced by the electric charge. Dissipation is described by streaming-out or diffusion approximations. We match the interior solution, in noncomoving coordinates, with the Vaidya-Reissner-Nordstroem exterior solution. Two models are considered: (i) a Schwarzschild-like shell in the diffusion limit; and (ii) a Schwarzschild-like interior in the free-streaming limit. These toy models tell us something about the nature of the dissipative and electrically charged collapse. Diffusion stabilizes the gravitational collapse producing a spherical shell whose contraction is halted in a short characteristic hydrodynamic time. The streaming-out radiation provides a more efficient mechanism for emission of energy, redistributing the electric charge on the whole sphere, while the distribution collapses indefinitely with a longer hydrodynamic time scale.

Rosales, L. [Laboratorio de Fisica Computacional, Universidad Experimental Politecnica 'Antonio Jose de Sucre', Puerto Ordaz (Venezuela, Bolivarian Republic of); Barreto, W. [Centro de Fisica Fundamental, Facultad de Ciencias, Universidad de Los Andes, Merida (Venezuela, Bolivarian Republic of); Peralta, C. [Deutscher Wetterdienst, Frankfurter Str. 135, 63067 Offenbach (Germany); School of Physics, University of Melbourne, Parkville, VIC 3010 (Australia); Rodriguez-Mueller, B. [Computational Science Research Center, College of Sciences, San Diego State University, San Diego, California (United States)

2010-10-15T23:59:59.000Z

178

Coherent detection method of gravitational wave bursts for spherical antennas  

E-Print Network (OSTI)

We provide a comprehensive theoretical framework and a quantitative test of the method we recently proposed for processing data from a spherical detector with five or six transducers. Our algorithm is a trigger event generator performing a coherent analysis of the sphere channels. In order to test our pipeline we first built a detailed numerical model of the detector, including deviations from the ideal case such as quadrupole modes splitting, and non-identical transducer readout chains. This model, coupled with a Gaussian noise generator, has then been used to produce six time series, corresponding to the outputs of the six transducers attached to the sphere. We finally injected gravitational wave burst signals into the data stream, as well as bursts of non-gravitational origin in order to mimic the presence of non-Gaussian noise, and then processed the mock data. We report quantitative results for the detection efficiency versus false alarm rate and for the affordability of the reconstruction of the direction of arrival. In particular, the combination of the two direction reconstruction methods can reduce by a factor of 10 the number false alarms due to the non-Gaussian noise.

S. Foffa; R. Sturani

2008-12-22T23:59:59.000Z

179

Polymorphic-Torus Network  

E-Print Network (OSTI)

The memo specifies the Hot Standby Router Protocol (HSRP). The goal of the protocol is to allow hosts to appear to use a single router and to maintain connectivity even if the actual first hop router they are using fails. Multiple routers participate in this protocol and in concert create the illusion of a single virtual router. The protocol insures that one and only one of the routers is forwarding packets on behalf of the virtual router. End hosts forward their packets to the virtual router.

Status Of This; P. Morton; D. Li; Cisco Systems; Cisco Systems

1989-01-01T23:59:59.000Z

180

Market response to external events and interventions in spherical minority games  

E-Print Network (OSTI)

We solve the dynamics of large spherical Minority Games (MG) in the presence of non-negligible time dependent external contributions to the overall market bid. The latter represent the actions of market regulators, or other major natural or political events that impact on the market. In contrast to non-spherical MGs, the spherical formulation allows one to derive closed dynamical order parameter equations in explicit form and work out the market's response to such events fully analytically. We focus on a comparison between the response to stationary versus oscillating market interventions, and reveal profound and partially unexpected differences in terms of transition lines and the volatility.

Papadopoulos, P

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "national spherical torus" 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

Energy-momentum Prescriptions in General Spherically Symmetric Space-times  

E-Print Network (OSTI)

Einstein, Landau-Lifshitz, Papapetrou, Weinberg, and M{\\o}ller energy-momentum prescriptions in general spherically symmetric space-times are investigated. It is shown that for two special but not unusual classes of general spherically symmetric space-times several energy-momentum prescriptions in Schwarzschild Cartesian coordinates lead to some coincidences in energy distribution. It is also obtained that for a special class of spherically symmetric metrics M{\\o}ller and Einstein energy-momentum prescriptions give the same result for energy distribution if and only if it has a specific dependence on radial coordinate.

Saeed Mirshekari; Amir M. Abbassi

2008-08-01T23:59:59.000Z

182

New framework for studying spherically symmetric static solutions in f(R) gravity  

Science Conference Proceedings (OSTI)

We develop a new covariant formalism to treat spherically symmetric spacetimes in metric f(R) theories of gravity. Using this formalism we derive the general equations for a static and spherically symmetric metric in a general f(R) gravity. These equations are used to determine the conditions for which the Schwarzschild metric is the only vacuum solution with vanishing Ricci scalar. We also show that our general framework provides a clear way of showing that the Schwarzschild solution is not a unique static spherically symmetric solution, providing some insight into how the current form of Birkhoff's theorem breaks down for these theories.

Nzioki, Anne Marie; Goswami, Rituparno [Astrophysics, Cosmology and Gravity Centre (ACGC), University of Cape Town, Rondebosch, 7701 (South Africa); Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch, 7701 (South Africa); Carloni, Sante [Institut d'Estudis Espacials de Catalunya (IEEC), Campus UAB, Facultat Ciencies, Torre C5-Par-2a pl, E-08193 Bellaterra (Barcelona) (Spain); Dunsby, Peter K. S. [Astrophysics, Cosmology and Gravity Centre (ACGC), University of Cape Town, Rondebosch, 7701 (South Africa); Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch, 7701 (South Africa); South African Astronomical Observatory, Observatory, Cape Town (South Africa)

2010-04-15T23:59:59.000Z

183

National System Templates: Building Sustainable National Inventory...  

Open Energy Info (EERE)

National System Templates: Building Sustainable National Inventory Management Systems Jump to: navigation, search Tool Summary Name: National System Templates: Building Sustainable...

184

National Security Initiatives | ORNL  

NLE Websites -- All DOE Office Websites (Extended Search)

Bioinformatics Facilities Events and Conferences Supporting Organizations National Security Home | Science & Discovery | National Security | Initiatives SHARE National...

185

National Preparedness Goal  

Science Conference Proceedings (OSTI)

... impact on security, national economic security, national public health or ... technology; national monuments and icons; nuclear reactors, material, and ...

2011-10-20T23:59:59.000Z

186

A classification of spherically symmetric self-similar dust models  

E-Print Network (OSTI)

We classify all spherically symmetric dust solutions of Einstein's equations which are self-similar in the sense that all dimensionless variables depend only upon $z\\equiv r/t$. We show that the equations can be reduced to a special case of the general perfect fluid models with equation of state $p=\\alpha \\mu$. The most general dust solution can be written down explicitly and is described by two parameters. The first one (E) corresponds to the asymptotic energy at large $|z|$, while the second one (D) specifies the value of z at the singularity which characterizes such models. The E=D=0 solution is just the flat Friedmann model. The 1-parameter family of solutions with z>0 and D=0 are inhomogeneous cosmological models which expand from a Big Bang singularity at t=0 and are asymptotically Friedmann at large z; models with E>0 are everywhere underdense relative to Friedmann and expand forever, while those with E0 ones. The 2-parameter solutions with D>0 again represent inhomogeneous cosmological models but the Big Bang singularity is at $z=-1/D$, the Big Crunch singularity is at $z=+1/D$, and any particular solution necessarily spans both z0. While there is no static model in the dust case, all these solutions are asymptotically ``quasi-static'' at large $|z|$. As in the D=0 case, the ones with $E \\ge 0$ expand or contract monotonically but the latter may now contain a naked singularity. The ones with E<0 expand from or recollapse to a second singularity, the latter containing a black hole.

B. J. Carr

2000-03-02T23:59:59.000Z

187

National Ignition Facility Target Chamber  

DOE Green Energy (OSTI)

On June 11, 1999 the Department of Energy dedicated the single largest piece of the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL) in Livermore, California. The ten (10) meter diameter aluminum target high vacuum chamber will serve as the working end of the largest laser in the world. The output of 192 laser beams will converge at the precise center of the chamber. The laser beams will enter the chamber in two by two arrays to illuminate 10 millimeter long gold cylinders called hohlraums enclosing 2 millimeter capsule containing deuterium, tritium and isotopes of hydrogen. The two isotopes will fuse, thereby creating temperatures and pressures resembling those found only inside stars and in detonated nuclear weapons, but on a minute scale. The NIF Project will serve as an essential facility to insure safety and reliability of our nation's nuclear arsenal as well as demonstrating inertial fusion's contribution to creating electrical power. The paper will discuss the requirements that had to be addressed during the design, fabrication and testing of the target chamber. A team from Sandia National Laboratories (SNL) and LLNL with input from industry performed the configuration and basic design of the target chamber. The method of fabrication and construction of the aluminum target chamber was devised by Pitt-Des Moines, Inc. (PDM). PDM also participated in the design of the chamber in areas such as the Target Chamber Realignment and Adjustment System, which would allow realignment of the sphere laser beams in the event of earth settlement or movement from a seismic event. During the fabrication of the target chamber the sphericity tolerances had to be addressed for the individual plates. Procedures were developed for forming, edge preparation and welding of individual plates. Construction plans were developed to allow the field construction of the target chamber to occur parallel to other NIF construction activities. This was necessary to achieve the overall schedule. Plans had to be developed for the precise location and alignment of laser beam ports. Upon completion of the fabrication of the aluminum target chamber in a temporary structure the 130 ton sphere was moved from the temporary construction enclosure to its final location in the target building. Prior to the installation of a concrete shield and after completion of the welding of the chamber penetrations vacuum leak checking was performed to insure the vacuum integrity of target chamber. The entire spherical chamber external surface supports a 40 cm thick reinforced concrete shield after installation in the target building. The final task is a total survey of the laser ports and the contour machining of spacer plates so that laser devices attached to these ports meet the alignment criteria.

Wavrik, R W; Cox, J R; Fleming, P J

2000-10-05T23:59:59.000Z

188

Application of the Spectral Method to Solve the Meridional Circulation Equation in Spherical-Sigma Coordinates  

Science Conference Proceedings (OSTI)

The equation governing the zonally averaged meridional circulation (W?, v? in spherical-sigma coordinates is formulated including the semigeostrophic terms. This equation and the mass continuity equation are spectrally transformed in terms of ...

H-I. Lu; R. L. Pfeffer

1985-11-01T23:59:59.000Z

189

Optimal Estimation of Spherical Harmonic Components from a Sample with Spatially Nonuniform Covariance Statistics  

Science Conference Proceedings (OSTI)

An optimal estimation technique is presented to estimate spherical harmonic coefficients. This technique is based on the minimization of the mean square error. This optimal estimation technique consists of computing optimal weights for a given ...

Kwang-Y. Kim; Gerald R. North; Samuel S. Shen

1996-03-01T23:59:59.000Z

190

Transitions from Hadley to Rossby Flows in Internally Forced Rotating Spherical Systems  

Science Conference Proceedings (OSTI)

The possibility of global-scale transitions between atmospheric Hadley and Rossby regimes is investigated with a highly idealized, nonlinear, vertically continuous, rotating, spherical system. Low-order spectral versions of the model are used ...

R. Wayne Higgins; Hampton N. Shirer

1990-05-01T23:59:59.000Z

191

Spherical Nonparametric Estimators Applied to the UGAMP Model Integration for AMIP  

Science Conference Proceedings (OSTI)

The aim of this paper is essentially twofold: first, to describe the use of spherical nonparametric estimators for determining statistical diagnostic fields from ensembles of feature tracks on a global domain, and second, to report the ...

K. I. Hodges

1996-12-01T23:59:59.000Z

192

The Granular Sea Ice Model in Spherical Coordinates and Its Application to a Global Climate Model  

Science Conference Proceedings (OSTI)

The granular sea ice model (GRAN) from Tremblay and Mysak is converted from Cartesian to spherical coordinates. In this conversion, the metric terms in the divergence of the deviatoric stress and in the strain rates are included. As an ...

Jan Sedlacek; Jean-François Lemieux; Lawrence A. Mysak; L. Bruno Tremblay; David M. Holland

2007-12-01T23:59:59.000Z

193

A two-phase spherical electric machine for generating rotating uniform magnetic fields  

E-Print Network (OSTI)

This thesis describes the design and construction of a novel two-phase spherical electric machine that generates rotating uniform magnetic fields, known as a fluxball machine. Alternative methods for producing uniform ...

Lawler, Clinton T. (Clinton Thomas)

2007-01-01T23:59:59.000Z

194

An Upwind-Biased Transport Scheme Using a Quadratic Reconstruction on Spherical Icosahedral Grids  

Science Conference Proceedings (OSTI)

Several transport schemes developed for spherical icosahedral grids are based on the piecewise linear approximation. The simplest one among them uses an algorithm where the tracer distribution in the upwind side of a cell face is reconstructed ...

Hiroaki Miura; William C. Skamarock

2013-02-01T23:59:59.000Z

195

Conservation and Linear Rossby-Mode Dispersion on the Spherical C Grid  

Science Conference Proceedings (OSTI)

Discretizations of the linearized shallow-water equations on a spherical C grid are considered. Constraints on the schemes' coefficients that ensure conservation of mass, angular momentum, and energy are derived. These results generalize ...

John Thuburn; Andrew Staniforth

2004-02-01T23:59:59.000Z

196

Fast Spherical Harmonic Transform Routine FLTSS Applied to the Shallow Water Test Set  

Science Conference Proceedings (OSTI)

The fast spherical harmonic transform algorithm proposed by Suda and Takami is evaluated in the solutions of the shallow water equation test set defined by Williamson et al. through replacing the Legendre transforms of the NCAR spectral transform ...

Reiji Suda

2005-03-01T23:59:59.000Z

197

Long Atmospheric Waves and the Polar-Plane Approximation to the Earth’s Spherical Geometry  

Science Conference Proceedings (OSTI)

The spherical geometry of the earth is replaced by polar cylindrical geometry, with a plane tangential to the earth at the pole. The resulting frequency and structure of free motions in an isothermal, adiabatic atmosphere with a resting basic ...

Alison F. C. Bridger; Duane E. Stevens

1980-03-01T23:59:59.000Z

198

The Steady Linear Response of a Spherical Atmosphere to Thermal and Orographic Forcing  

Science Conference Proceedings (OSTI)

Motivated by some results from barotropic models, a linearized steady-state five-layer baroclinic model is used to study the response of a spherical atmosphere to thermal and orographic forcing. At low levels the significant perturbations are ...

Brian J. Hoskins; David J. Karoly

1981-06-01T23:59:59.000Z

199

Extension of Spherical Nonparametric Estimators to Nonisotropic Kernels: An Oceanographic Application  

Science Conference Proceedings (OSTI)

In a recently published paper, spherical nonparametric estimators were applied to feature-track ensembles to determine a range of statistics for the atmospheric features considered. This approach obviates the types of bias normally introduced ...

K. I. Hodges

1999-02-01T23:59:59.000Z

200

Manager, Sandia National Laboratories | National Nuclear Security...  

National Nuclear Security Administration (NNSA)

Sandia National Laboratories | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response...

Note: This page contains sample records for the topic "national spherical torus" 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

Remark on:- The Neutron Spherical Optical-Model Absorption  

NLE Websites -- All DOE Office Websites (Extended Search)

Argonne National Laboratory Argonne National Laboratory Argonne is a U.S. Department of Energy laboratory managed by UChicago Argonne, LLC under contract DE-AC02-06CH11357. The Laboratory's main facility is outside Chicago, at 9700 South Cass Avenue, Argonne, Illinois 60439. For information about Argonne, see www.anl.gov. Availability of This Report This report is available, at no cost, at http://www.osti.gov/bridge. It is also available on paper to the U.S. Department of Energy and its contractors, for a processing fee, from: U.S. Department of Energy Office of Scientific and Technical Information P.O. Box 62 Oak Ridge, TN 37831-0062 phone (865) 576-8401 fax (865) 576-5728 reports@adonis.osti.gov Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States

202

National System Templates: Building Sustainable National Inventory  

Open Energy Info (EERE)

National System Templates: Building Sustainable National Inventory National System Templates: Building Sustainable National Inventory Management Systems Jump to: navigation, search Tool Summary LAUNCH TOOL Name: National System Templates: Building Sustainable National Inventory Management Systems Agency/Company /Organization: United States Environmental Protection Agency, United States Agency for International Development Sector: Energy, Land Focus Area: Non-renewable Energy, Forestry, Agriculture Topics: GHG inventory Resource Type: Guide/manual, Training materials Website: www.epa.gov/climatechange/emissions/ghginventorycapacitybuilding/templ National System Templates: Building Sustainable National Inventory Management Systems Screenshot References: National System Templates: Building Sustainable National Inventory Management Systems[1]

203

National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Homesteading on the Pajarito Plateau Homesteading on the Pajarito Plateau topic of inaugural lecture at Los Alamos National Laboratory January 4, 2013 Lecture series begins yearlong commemoration of 70th anniversary LOS ALAMOS, NEW MEXICO, Jan. 3, 2013-In commemoration of its 70th anniversary, Los Alamos National Laboratory kicks off a yearlong lecture series on Wednesday, Jan. 9, at 5:30 p.m. with a presentation about homesteading on the Pajarito Plateau at the Bradbury Science Museum, 1350 Central Avenue, Los Alamos. - 2 - The inaugural lecture is based on a book by local writers Dorothy Hoard, Judy Machen and Ellen McGehee about the area's settlement between 1887 and 1942. On hikes across the Pajarito Plateau, Hoard envisioned the Los Alamos area before modern roads and bridges made transportation much easier. The trails she walked

204

NATIONAL NEWS  

NLE Websites -- All DOE Office Websites (Extended Search)

March 5, 2010 National News......................................................................3 Schumer Proposal to Halt ARRA Funds for Renewable Projects Would Cause Immediate Job Loss in U.S., DOE Officials Tell Congress .................................................................................................................................. 3 Geothermal Energy Holds Strong Presence at Renewable Energy World Conference; Applications with Oil and Gas Coproduction Gain Attention .......................................................................................................................... 4 House Subcommittee on Energy and Mineral Resources Hold Legislative Hearing on the Geothermal Production and Expansion Act, HR 3709 ..............................................................................................................

205

MODELING ION-EXCHANGE PROCESSING WITH SPHERICAL RESINS FOR CESIUM REMOVAL  

SciTech Connect

The spherical Resorcinol-Formaldehyde and hypothetical spherical SuperLig? 644 ion-exchange resins are evaluated for cesium removal from radioactive waste solutions. Modeling results show that spherical SuperLig? 644 reduces column cycling by 50% for highpotassium solutions. Spherical Resorcinol Formaldehyde performs equally well for the lowestpotassium wastes. Less cycling reduces nitric acid usage during resin elution and sodium addition during resin regeneration, therefore, significantly decreasing life-cycle operational costs. A model assessment of the mechanism behind ?cesium bleed? is also conducted. When a resin bed is eluted, a relatively small amount of cesium remains within resin particles. Cesium can bleed into otherwise decontaminated product in the next loading cycle. The bleed mechanism is shown to be fully isotherm-controlled vs. mass transfer controlled. Knowledge of residual postelution cesium level and resin isotherm can be utilized to predict rate of cesium bleed in a mostly non-loaded column. Overall, this work demonstrates the versatility of the ion-exchange modeling to study the effects of resin characteristics on processing cycles, rates, and cold chemical consumption. This evaluation justifies further development of a spherical form of the SL644 resin.

Hang, T.; Nash, C.; Aleman, S.

2012-09-19T23:59:59.000Z

206

Numerical Relativity in Spherical Polar Coordinates: Evolution Calculations with the BSSN Formulation  

E-Print Network (OSTI)

In the absence of symmetry assumptions most numerical relativity simulations adopt Cartesian coordinates. While Cartesian coordinates have some desirable properties, spherical polar coordinates appear better suited for certain applications, including gravitational collapse and supernova simulations. Development of numerical relativity codes in spherical polar coordinates has been hampered by the need to handle the coordinate singularities at the origin and on the axis, for example by careful regularization of the appropriate variables. Assuming spherical symmetry and adopting a covariant version of the BSSN equations, Montero and Cordero-Carri\\'on recently demonstrated that such a regularization is not necessary when a partially implicit Runge-Kutta (PIRK) method is used for the time evolution of the gravitational fields. Here we report on an implementation of the BSSN equations in spherical polar coordinates without any symmetry assumptions. Using a PIRK method we obtain stable simulations in three spatial dimensions without the need to regularize the origin or the axis. We perform and discuss a number of tests to assess the stability, accuracy and convergence of the code, namely weak gravitational waves, "hydro-without-hydro" evolutions of spherical and rotating relativistic stars in equilibrium, and single black holes.

Thomas W. Baumgarte; Pedro J. Montero; Isabel Cordero-Carrión; Ewald Müller

2012-11-28T23:59:59.000Z

207

Lawrence Livermore National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Lawrence Livermore National Laboratory Lawrence Livermore National Laboratorys (LLNL) primary mission is research and development in support of national security. As a...

208

National Hydrogen Energy Roadmap  

NLE Websites -- All DOE Office Websites (Extended Search)

NATIONAL HYDROGEN ENERGY ROADMAP NATIONAL HYDROGEN ENERGY ROADMAP . . Toward a More Secure and Cleaner Energy Future for America Based on the results of the National Hydrogen...

209

Lawrence Livermore National Laboratory Lawrence Livermore National...  

National Nuclear Security Administration (NNSA)

racks "Green" supercomputer reduces energy footprint by 75% "Green" supercomputer reduces energy footprint by 75% Lawrence Livermore National Laboratory Lawrence Livermore National...

210

Researcher, Sandia National Laboratories | National Nuclear Security...  

National Nuclear Security Administration (NNSA)

Paul Dodd Researcher, Sandia National Laboratories Paul Dodd Paul Dodd Role: Researcher, Sandia National Laboratories Award: Fellow of the Institute of Electrical & Electronics...

211

Engineer, Sandia National Laboratories | National Nuclear Security...  

National Nuclear Security Administration (NNSA)

Clifford Ho Engineer, Sandia National Laboratories Clifford Ho Clifford Ho Role: Engineer, Sandia National Laboratories Award: Asian American Engineer of the Year Profile: Clifford...

212

Sandia National Laboratories | National Nuclear Security Administratio...  

NLE Websites -- All DOE Office Websites (Extended Search)

Allison Davis Sandia National Laboratories Allison Davis Allison Davis Role: Sandia National Laboratories Award: NNSA Defense Programs Award of Excellence Profile: Two individuals...

213

Sandia National Laboratories Albuquerque | National Nuclear Security...  

NLE Websites -- All DOE Office Websites (Extended Search)

Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our Locations > Sandia National Laboratories Albuquerque Sandia National Laboratories Albuquerque http:...

214

Sandia National Laboratories | National Nuclear Security Administratio...  

NLE Websites -- All DOE Office Websites (Extended Search)

Kevin Eklund Sandia National Laboratories Kevin Eklund Kevin Eklund Role: Sandia National Laboratories Profile: Two individuals and nine teams received the NNSA Defense Programs...

215

National National Strategy for Pandemic Influenza, Implementation...  

NLE Websites -- All DOE Office Websites (Extended Search)

to renew a declaration of national emergency to prevent its automatic expiration. The Presidential declaration of a national emergency under the act is a prerequisite to...

216

National Supplemental Screening Program | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

National Supplemental Screening Program The National Supplemental Screening Program (NSSP) offers medical screenings at no charge for former U.S. Department of Energy (DOE) site...

217

A test of Einstein's theory of gravitation: Velocity distribution of low-energy particles in a spherically symmetric gravitational field  

E-Print Network (OSTI)

We propose a new test of Einstein's theory of gravitation. It concerns the velocity distribution of low-energy particles in a spherically symmetric gravitational field.

Jian-Miin Liu

2002-06-17T23:59:59.000Z

218

Experimental Study of Parametric Dependence of Electron-scale Turbulence in a Spherical Tokamak  

Science Conference Proceedings (OSTI)

Electron-scale turbulence is predicted to drive anomalous electron thermal transport. However, experimental study of its relation with transport is still in its early stage. On the National Spherical Tokamak eXperiment (NSTX), electron-scale density ?uctuations are studied with a novel tangen- tial microwave scattering system with high radial resolution of ±2 cm. Here, we report a study of parametric dependence of electron-scale turbulence in NSTX H-mode plasmas. The dependence on density gradient is studied through the observation of a large density gradient variation in the core induced by an ELM event, where we found the ?rst clear experimental evidence of density gradient stabilization of electron-gyro scale turbulence in a fusion plasma. This observation, cou- pled with linear gyro-kinetic calculations, leads to the identi?cation of the observed instability as toroidal Electron Temperature Gradient (ETG) modes. It is observed that longer wavelength ETG modes, k??s electron temperature and k? is the wavenumber perpendicular to local equilibrium magnetic ?eld), are most stabilized by density gradient, and the stabilization is accompanied by about a factor of two decrease in electron thermal di?usivity. Comparisons with nonlinear ETG gyrokinetic simulations shows ETG turbulence may be able to explain the experimental electron heat ?ux observed before the ELM event. The collisionality dependence of electron-scale turbulence is also studied by systematically varying plasma current and toroidal ?eld, so that electron gyroradius (?e ), electron beta (?e ) and safety factor (q95 ) are kept approximately constant. More than a factor of two change in electron collisionality, ? ?e, was achieved, and we found that the spectral power of electron-scale turbulence appears to increase as ? ?e is decreased in this collisonality scan. However, both linear and nonlinear simulations show no or weak dependence with the electron-ion collision frequency, ? e/i . Instead, other equilibrium parameters (safety factor, electron density gradient, for example) a?ect ETG linear growth rate and electron thermal transport more than ? e/i does. Furthermore, electron heat ?ux predicted by the simulations is found to have an order-of-magnitude spatial variation in the experimental mea- surement region and is also found to be much smaller than experimental levels except at one radial location we evaluated. The predicted electron heat ?ux is shown to be strongly anti-correlated with density gradient which varies for a factor of three in the measurement region, which is in agreement with the density gradient dependence study reported in this paper.

Ren, Y; Kaye, S M; Mazzucato, E; Bell, R E; Diallo, A; Domier, C W; LeBlanc, B P; Lee, K C; Smith, D R

2012-05-23T23:59:59.000Z

219

Experimental Study of Parametric Dependence of Electron-scale Turbulence in a Spherical Tokamak  

SciTech Connect

Electron-scale turbulence is predicted to drive anomalous electron thermal transport. However, experimental study of its relation with transport is still in its early stage. On the National Spherical Tokamak eXperiment (NSTX), electron-scale density ?uctuations are studied with a novel tangen- tial microwave scattering system with high radial resolution of ±2 cm. Here, we report a study of parametric dependence of electron-scale turbulence in NSTX H-mode plasmas. The dependence on density gradient is studied through the observation of a large density gradient variation in the core induced by an ELM event, where we found the ?rst clear experimental evidence of density gradient stabilization of electron-gyro scale turbulence in a fusion plasma. This observation, cou- pled with linear gyro-kinetic calculations, leads to the identi?cation of the observed instability as toroidal Electron Temperature Gradient (ETG) modes. It is observed that longer wavelength ETG modes, k??s < 10 (?s is the ion gyroradius at electron temperature and k? is the wavenumber perpendicular to local equilibrium magnetic ?eld), are most stabilized by density gradient, and the stabilization is accompanied by about a factor of two decrease in electron thermal di?usivity. Comparisons with nonlinear ETG gyrokinetic simulations shows ETG turbulence may be able to explain the experimental electron heat ?ux observed before the ELM event. The collisionality dependence of electron-scale turbulence is also studied by systematically varying plasma current and toroidal ?eld, so that electron gyroradius (?e ), electron beta (?e ) and safety factor (q95 ) are kept approximately constant. More than a factor of two change in electron collisionality, ? ?e, was achieved, and we found that the spectral power of electron-scale turbulence appears to increase as ? ?e is decreased in this collisonality scan. However, both linear and nonlinear simulations show no or weak dependence with the electron-ion collision frequency, ? e/i . Instead, other equilibrium parameters (safety factor, electron density gradient, for example) a?ect ETG linear growth rate and electron thermal transport more than ? e/i does. Furthermore, electron heat ?ux predicted by the simulations is found to have an order-of-magnitude spatial variation in the experimental mea- surement region and is also found to be much smaller than experimental levels except at one radial location we evaluated. The predicted electron heat ?ux is shown to be strongly anti-correlated with density gradient which varies for a factor of three in the measurement region, which is in agreement with the density gradient dependence study reported in this paper.

Ren, Y; Kaye, S M; Mazzucato, E; Bell, R E; Diallo, A; Domier, C W; LeBlanc, B P; Lee, K C; Smith, D R

2012-05-23T23:59:59.000Z

220

Approximation method for a spherical bound system in the quantum plasma  

Science Conference Proceedings (OSTI)

A system of quantum hydrodynamic equations has been used for investigating the dielectric tensor and dispersion equation of a semiconductor as a quantum magnetized plasma. Dispersion relations and their modifications due to quantum effects are derived for both longitudinal and transverse waves. The number of states and energy levels are analytically estimated for a spherical bound system embedded in a semiconductor quantum plasma. The results show that longitudinal waves decay rapidly and do not interact with the spherical bound system. The energy shifts caused by the spin-orbit interaction and the Zeeman effect are calculated.

Mehramiz, A.; Sobhanian, S. [Department of Atomic and Molecular Physics, Faculty of Physics, University of Tabriz, East Azerbaijan 51664 (Iran, Islamic Republic of); Mahmoodi, J. [Department of Physics, Faculty of Science, University of Qom, P.O. Box 3716146611, Qom (Iran, Islamic Republic of)

2010-08-15T23:59:59.000Z

Note: This page contains sample records for the topic "national spherical torus" 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.


221

Dedicated Supernova Detection by a Network of Neutral Current Spherical TPC's  

E-Print Network (OSTI)

Supernova neutrinos can easily be detected by a spherical gaseous TPC detector measuring very low energy nuclear recoils. The expected rates are quite large for a neutron rich target since the neutrino nucleus neutral current interaction yields a coherent contribution of all neutrons. As a matter of fact for a typical supernova at 10 kpc, about 1000 events are expected using a spherical detector of radius 4 m with Xe gas at a pressure of 10 Atm. A world wide network of several such simple, stable and low cost supernova detectors with a running time of a few centuries is quite feasible.

J. D. Vergados; Y. Giomataris

2005-11-16T23:59:59.000Z

222

Dedicated Supernova Detection by a Network of Neutral Current Spherical TPC's  

E-Print Network (OSTI)

Supernova neutrinos can easily be detected by a spherical gaseous TPC detector measuring very low energy nuclear recoils. The expected rates are quite large for a neutron rich target since the neutrino nucleus neutral current interaction yields a coherent contribution of all neutrons. As a matter of fact for a typical supernova at 10 kpc, about 1000 events are expected using a spherical detector of radius 4 m with Xe gas at a pressure of 10 Atm. A world wide network of several such simple, stable and low cost supernova detectors with a running time of a few centuries is quite feasible.

Vergados, J D

2005-01-01T23:59:59.000Z

223

First experiment on fission transients in highly fissile spherical nuclei produced by fragmentation of radioactive beams  

E-Print Network (OSTI)

We report on a novel experimental approach for studying the dissipative spreading of collective motion in a meta-stable nuclear system, using, for the first time, highly fissile nuclei with spherical shape. This was achieved by fragmentation of 45 radioactive heavy-ion beams at GSI, Darmstadt. The use of inverse kinematics and a dedicated experimental set-up allowed for the identification in atomic number of both fission fragments. From the width of their charge distributions, a transient time of (3.3 +/- 0.7) 10-21 s is deduced for initially spherical nuclei.

C. Schmitt; P. N. Nadtochy; A. Heinz; B. Jurado; A. Kelic; K. -H. Schmidt

2007-02-12T23:59:59.000Z

224

Department of Energy National Laboratories  

Idaho National Laboratory SLAC National Accelerator Laboratory Department of Energy National Laboratories. Laboratory or Facility Website ...

225

Implications for National Policy  

Science Conference Proceedings (OSTI)

The World Is Flat: Making Materials Matter. National Policy Implications. Toni Marechaux. Board on Manufacturing and Engineering Design. National Research ...

226

Mechanism of Radial Redistribution of Energetic Trapped Ions Due to m=2/n=1 Internal Reconnection in Joint European Torus Shear Optimized Plasmas  

DOE Green Energy (OSTI)

Internal radial redistribution of MeV energy ICRF-driven hydrogen minority ions was inferred from neutral particle analyzer measurements during large amplitude MHD activity leading to internal reconnection in Shear Optimized plasmas in the Joint European Torus (JET). A theory is developed for energetic ion redistribution during a reconnection driven by an m=2/n=1 internal kink mode. Plasma motion during reconnection generates an electric field which can change the energy and radial position of the energetic ions. The magnitude of ion energy change depends on the value of the safety factor at the plasma core from which the energetic ions are redistributed. A relation is found for corresponding change in canonical momentum. P(subscript phi), which leads to radial displacement of the ions. The model yields distinctive new features of energetic ion redistribution under such conditions. Predicted characteristics of ion redistribution are compared with the NPA measurements, and good correlation is found. Sometimes fast ions were transported to the plasma edge due to interaction with a long-lived magnetic island which developed after the reconnection and had chirping frequency in the laboratory frame. Convection of resonant ions trapped in a radially moving phase-space island is modeled to understand the physics of such events.

N.N. Gorelenkov; A. Gondhalekar; A.A. Korotkov; S.E. Sharapov; D. Testa; and Contributors to the EFDA-JET Workprogramme

2002-01-18T23:59:59.000Z

227

A new spherical harmonics scheme for multi-dimensional radiation transport I. Static matter configurations  

Science Conference Proceedings (OSTI)

Recent work by McClarren and Hauck (2010) [31] suggests that the filtered spherical harmonics method represents an efficient, robust, and accurate method for radiation transport, at least in the two-dimensional (2D) case. We extend their work to the ... Keywords: Asymptotic diffusion limit, Discontinuous Galerkin, PN-method, Radiation transport

David Radice, Ernazar Abdikamalov, Luciano Rezzolla, Christian D. Ott

2013-06-01T23:59:59.000Z

228

Spherical Resorcinol-Formaldehyde Resin Testing for Cesium Removal from Hanford Tank Waste Simulant  

SciTech Connect

A new spherical form of resorcinol-formaldehyde (RF) resin was tested for efficacy of cesium removal from Hanford tank waste. Two spherical RF formulations, prepared by varying curing temperature, were tested. Both resins had a tight particle size distribution and a high degree of sphericity. Small-scale column testing (on {approx}20-mL resin beds) was conducted evaluating the cesium load profile with AZ-102 simulated tank waste and the cesium elution profile using 0.5 M HNO3 eluant. The load and elution profiles were compared in side-by-side testing with ground-gel RF resin and SuperLig? 644, the Waste Treatment Plant baseline ion exchanger. Although capacity was not as high at the other resins tested, the spherical RF resin met plant cesium loading requirements with the AZ-102 simulant matrix. Excellent reproducibility of cesium load and elution was demonstrated over three process cycles with no evidence of degraded performance. Residual cesium on the resin beds after elution was nearly a factor of 10 lower than that of the ground-gel RF and SuperLig? 644.

Fiskum, Sandra K.; Blanchard, David L.; Steele, Marilyn J.; Thomas, Kathie K.; Trang-Le, Truc LT; Thorson, Murray R.

2006-08-01T23:59:59.000Z

229

Optical forces due to spherical microresonators and their manifestation in optically induced orbital motion of nanoparticles  

SciTech Connect

By considering the interaction between whispering-gallery modes of a spherical resonator and a subwavelength polarizable particle, we demonstrate that spatial confinement of the electromagnetic field dramatically changes the character of the optical forces exerted. We show that this phenomenon can be experimentally observed in the optically induced orbital motion of the particle.

Rubin, J. T.; Deych, L. I. [Department of Physics, Queens College of the City University of New York, Flushing, New York 11367 (United States) and Graduate School and University Center, The City University of New York, 365 Fifth Avenue, New York, New York 10016 (United States)

2011-08-15T23:59:59.000Z

230

Binding energy calculation of excitonic trions in spherical quantum dots with the quantum adiabatic theorem  

Science Conference Proceedings (OSTI)

The stability of the charged excitons X+ and X- as a function of the spherical quantum dot radius R and also as a function of the effective mass ratio ? is studied with a formulation of the Hartree Fock approximation ... Keywords: bound excitons, excitons, quantum dots

S. Baskoutas; A. F. Terzis

2005-08-01T23:59:59.000Z

231

An Upwind-Biased Conservative Advection Scheme for Spherical Hexagonal–Pentagonal Grids  

Science Conference Proceedings (OSTI)

A discrete form of the flux-divergence operator is developed to compute advection of tracers on spherical hexagonal–pentagonal grids. An upwind-biased advection scheme based on a piecewise linear approximation for one-dimensional regular grids is ...

Hiroaki Miura

2007-12-01T23:59:59.000Z

232

SMI 2011: Full Paper: Parallel computation of spherical parameterizations for mesh analysis  

Science Conference Proceedings (OSTI)

Mesh parameterization is central to a broad spectrum of applications. In this paper, we present a novel approach to spherical mesh parameterization based on an iterative quadratic solver that is efficiently parallelizable on modern massively parallel ... Keywords: Feature detection, GPU, Mesh parameterization, Mesh segmentation, Parallel algorithms, Shape similarity object retrieval

Theodoros Athanasiadis; Ioannis Fudos

2011-06-01T23:59:59.000Z

233

Physical interpretation of gauge invariant perturbations of spherically symmetric space-times  

E-Print Network (OSTI)

By calculating the Newman-Penrose Weyl tensor components of a perturbed spherically symmetric space-time with respect to invariantly defined classes of null tetrads, we give a physical interpretation, in terms of gravitational radiation, of odd parity gauge invariant metric perturbations. We point out how these gauge invariants may be used in setting boundary and/or initial conditions in perturbation theory.

Brien C. Nolan

2004-06-11T23:59:59.000Z

234

Experimental study of layer mixing, relative ionic escape velocity, and electron temperature gradients in spherical multilayered targets by XUV spectroscopy  

SciTech Connect

This past year we have undertaken experiments at the University of Rochester's Laboratory for Laser Energetics investigating layer mixing and expansion velocities of spherical targets uniformly irradiated by high intensity laser light. We performed high resolution spectroscopic measurements of spherical plasmas, produced using the Omega laser, and have observed enhanced broadening of XUV emission lines due to the expansion velocities.

Griem, H.R.

1990-07-01T23:59:59.000Z

235

Previous Sandia National Laboratories | National Nuclear Security  

National Nuclear Security Administration (NNSA)

Previous Sandia National Laboratories | National Nuclear Security Previous Sandia National Laboratories | 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 Previous Sandia National Laboratories Home > About Us > Our Operations > Acquisition and Project Management > M & O Support Department > Sandia National Laboratories > Previous Sandia

236

National Energy Technology Laboratory National Energy Technology...  

NLE Websites -- All DOE Office Websites (Extended Search)

4U.S. Department of Energy U.S. Department of Energy National Energy Technology Laboratory National Energy Technology Laboratory Office of Public Affairs Office of Public Affairs...

237

Sandia National Laboratories: National Security Missions: Defense...  

NLE Websites -- All DOE Office Websites (Extended Search)

Cybersecurity Delivering experience & expertise Training the next generation of cyber defenders Cybersecurity computing Defending national security Applying science and engineering...

238

Sandia National Laboratories Albuquerque | National Nuclear Security...  

National Nuclear Security Administration (NNSA)

Laboratories, the laboratories responsible for the development, testing, and production of specialized nonnuclear components. Laboratories: The NNSA Sandia National...

239

Office of National Infrastructure & Sustainability | National...  

National Nuclear Security Administration (NNSA)

of National Infrastructure & Sustainability Home > About Us > Our Programs > Nonproliferation > Nuclear Nonproliferation Program Offices > Office of International Material...

240

ARGONNE NATIONAL LABORATORY is....  

NLE Websites -- All DOE Office Websites (Extended Search)

Scattering June 12-18, 2010 - Argonne National Laboratory June 19-26, 2010 - Oak Ridge National Laboratory Argonne National Laboratory is a U.S. Department of Energy laboratory...

Note: This page contains sample records for the topic "national spherical torus" 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.


241

Argonne's National Security Information Systems National  

NLE Websites -- All DOE Office Websites (Extended Search)

National Security National Security Information Systems National Security The NSIS team has worked with various government agencies and programs over the past 15 years to create customized technological solutions that meet specific needs, while also fulfilling national security objectives, improving efficiency and reducing costs. Applying a broad range of expertise and experience, the Argonne team develops both unclassified and classified information technology (IT) systems for national security and nonproliferation programs, with a focus on security operations, international treaty implementation, export control and law enforcement support. Some examples of NSIS-developed systems include:  Electronic Facility Clearance (e-FCL) System for the U.S. Department of Defense (DOD)

242

Experimental study of parametric dependence of electron-scale turbulence in a spherical tokamak  

Science Conference Proceedings (OSTI)

Electron-scale turbulence is predicted to drive anomalous electron thermal transport. However, experimental study of its relation with transport is still in its early stage. On the National Spherical Tokamak Experiment (NSTX), electron-scale density fluctuations are studied with a novel tangential microwave scattering system with high radial resolution of {+-}2 cm. Here, we report a study of parametric dependence of electron-scale turbulence in NSTX H-mode plasmas. The dependence on density gradient is studied through the observation of a large density gradient variation in the core induced by an edge localized mode (ELM) event, where we found the first clear experimental evidence of density gradient stabilization of electron-gyro scale turbulence in a fusion plasma. This observation, coupled with linear gyro-kinetic calculations, leads to the identification of the observed instability as toroidal electron temperature gradient (ETG) modes. It is observed that longer wavelength ETG modes, k{sub Up-Tack }{rho}{sub s} Less-Than-Or-Equivalent-To 10 ({rho}{sub s} is the ion gyroradius at electron temperature and k{sub Up-Tack} is the wavenumber perpendicular to local equilibrium magnetic field), are most stabilized by density gradient, and the stabilization is accompanied by about a factor of two decrease in electron thermal diffusivity. Comparisons with nonlinear ETG gyrokinetic simulations show ETG turbulence may be able to explain the experimental electron heat flux observed before the ELM event. The collisionality dependence of electron-scale turbulence is also studied by systematically varying plasma current and toroidal field, so that electron gyroradius ({rho}{sub e}), electron beta ({beta}{sub e}), and safety factor (q{sub 95}) are kept approximately constant. More than a factor of two change in electron collisionality, {nu}{sub e}{sup *}, was achieved, and we found that the spectral power of electron-scale turbulence appears to increase as {nu}{sub e}{sup *} is decreased in this collisonality scan. However, both linear and nonlinear simulations show no or weak dependence with the electron-ion collision frequency, {nu}{sup e/i}. Instead, other equilibrium parameters (safety factor, electron density gradient, for example) affect ETG linear growth rate and electron thermal transport more than {nu}{sup e/i} does. Furthermore, electron heat flux predicted by the simulations is found to have an order-of-magnitude spatial variation in the experimental measurement region and is also found to be much smaller than experimental levels except at one radial location we evaluated. The predicted electron heat flux is shown to be strongly anti-correlated with density gradient, which varies for a factor of three in the measurement region, which is in agreement with the density gradient dependence study reported in this paper.

Ren, Y.; Guttenfelder, W.; Kaye, S. M.; Mazzucato, E.; Bell, R. E.; Diallo, A.; LeBlanc, B. P. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Domier, C. W.; Lee, K. C. [University of California at Davis, Davis, California 95616 (United States); Smith, D. R. [University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States); Yuh, H. [Nova Photonics, Inc., Princeton, New Jersey 08540 (United States)

2012-05-15T23:59:59.000Z

243

Chemist, Sandia National Laboratories | National Nuclear Security  

National Nuclear Security Administration (NNSA)

Chemist, Sandia National Laboratories | National Nuclear Security Chemist, Sandia National Laboratories | 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 > Who We Are > In The Spotlight > Jerilyn Timlin Chemist, Sandia National Laboratories Jerilyn Timlin Jerilyn Timlin Role: Chemist, Sandia National Laboratories Award: National Institutes of Health (NIH) New Innovator Award

244

2012 National Electricity Forum  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

1 U.S. Department of Energy U.S. Department of Energy National Electric Transmission Congestion Study Workshop - December 8, 2011 National Electric Transmission Congestion Study...

245

Documents for Foreign Nationals  

NLE Websites -- All DOE Office Websites (Extended Search)

Turkmenistan, Ukraine, and Uzbekistan. **Terrorist-sponsoring countries include: Cuba, Iran, Sudan, and Syria. Requirements for Foreign Nationals (excluding nationals of sensitive...

246

Lawrence Livermore National Laboratory  

LLNL Home. Latest News Headlines. ... Operated by Lawrence Livermore National Security, LLC, for the Department of Energy's National Nuclear Security Administration

247

National Research Council Homepage  

Science Conference Proceedings (OSTI)

... with permission from the National Academy of Sciences, courtesy of the National Academies Press, Washington, DC This report is presented in .pdf ...

2013-06-27T23:59:59.000Z

248

National Hydrogen Energy Roadmap  

NLE Websites -- All DOE Office Websites (Extended Search)

HYDROGEN ENERGY ROADMAP NATIONAL HYDROGEN ENERGY ROADMAP . . Toward a More Secure and Cleaner Energy Future for America Based on the results of the National Hydrogen Energy Roadmap...

249

Procurement | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Procurement "Doing business with Argonne and Fermi national labs" - Aug. 21, 2013 Read more about "Doing business with Argonne and Fermi national labs" - Aug. 21, 2013 Argonne and...

250

Nationalism in Modern Greece.  

E-Print Network (OSTI)

??The focus of this project is the nature of nationalism viewed from different approaches and Greek nationalism in particular manifested in the support for the… (more)

Flethøj, Marie

2013-01-01T23:59:59.000Z

251

First National Technology Center  

NLE Websites -- All DOE Office Websites (Extended Search)

9 10 First National Technology First National Technology Center Center The Nature of the Grid - Industrial Age Power - Normal Course Voltage Interruptions: 2-3 seconds Lights and...

252

VII Hotine-Marussi Symposium on Theoretical Geodesy, 6-10 July 2009, Rome, Italy. Performance analysis of isotropic spherical harmonic spectral windows  

E-Print Network (OSTI)

analysis of isotropic spherical harmonic spectral windows B. Devaraju and N. Sneeuw Institute of Geodesy isotropic spherical harmonic spectral windows in the spa- tial domain. The parameters are devised in order to answer the following question: If an isotropic spherical harmonic window is applied in the spectral

Stuttgart, Universität

253

Three-dimensional Fourier transforms, integrals of spherical Bessel functions, and novel delta function identities  

E-Print Network (OSTI)

We present a general approach for evaluating a large variety of three-dimensional Fourier transforms. The transforms considered include the useful cases of the Coulomb and dipole potentials, and include situations where the transforms are singular and involve terms proportional to the Dirac delta function. Our approach makes use of the Rayleigh expansion of exp(i p.r) in terms of spherical Bessel functions, and we study a number of integrals, including singular integrals, involving a power of the independent variable times a spherical Bessel function. We work through several examples of three-dimensional Fourier transforms using our approach and show how to derive a number of identities involving multiple derivatives of 1/r, 1/r^2, and delta(\\vec r).

Gregory S. Adkins

2013-02-07T23:59:59.000Z

254

Application Of A Spherical-Radial Heat Transfer Model To Calculate  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Application Of A Spherical-Radial Heat Transfer Model To Calculate Geothermal Gradients From Measurements In Deep Boreholes Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Application Of A Spherical-Radial Heat Transfer Model To Calculate Geothermal Gradients From Measurements In Deep Boreholes Details Activities (0) Areas (0) Regions (0) Abstract: This paper presents estimates of the undisturbed formation temperatures in a geothermal exploration well drilled in the Ceboruco area in the western part of the Mexican Volcanic Belt. The method used assumes

255

Kinetics of phase-separation in the critical spherical model and local scale-invariance  

E-Print Network (OSTI)

The scaling forms of the space- and time-dependent two-time correlation and response functions are calculated for the kinetic spherical model with a conserved order-parameter and quenched to its critical point from a completely disordered initial state. The stochastic Langevin equation can be split into a noise part and into a deterministic part which has local scale-transformations with a dynamical exponent z=4 as a dynamical symmetry. An exact reduction formula allows to express any physical average in terms of averages calculable from the deterministic part alone. The exact spherical model results are shown to agree with these predictions of local scale-invariance. The results also include kinetic growth with mass conservation as described by the Mullins-Herring equation.

Florian Baumann; Malte Henkel

2006-11-26T23:59:59.000Z

256

The temperature field around a spherical ridge or trough in a plane  

SciTech Connect

An analytical solution, which describes the temperature field around a single spherical particle partly embedded in a plane or around a trough making an arbitrary contact angle with a plane, is presented here. The temperature distributions for three cases are studied: the temperature distribution around a conducting bowl or trough, the temperature distribution around a non-conducting bowl or trough present in a conducting plane, and the temperature profile around a conducting bowl or trough conducting heat toward a sink at infinity. The normalized heat flux distribution on the plane and particle is presented. The various incremental resistances caused by a single and a dilute planar random array of truncated spherical particles are also derived.

Fransaer, J.; Roos, J.R. (Katholieke Univ. Leuven, Heverlee (Belgium))

1992-05-01T23:59:59.000Z

257

Light-emitting diode spherical packages: an equation for the light transmission efficiency  

E-Print Network (OSTI)

Virtually all light-emitting diodes (LEDs) are encapsulated with a transparent epoxy or silicone-gel. In this paper we analyze the optical efficiency of spherical encapsulants. We develop a quasi-radiometric equation for the light transmission efficiency, which incorporates some ideas of Monte-Carlo ray tracing into the context of radiometry. The approach includes the extended source nature of the LED chip, and the chip radiance distribution. The equation is an explicit function of the size and the refractive index of the package, and also of several chip parameters such as shape, size, radiance, and location inside the package. To illustrate the use of this equation, we analyze several packaging configurations of practical interest; for example, a hemispherical dome with multiple chips, a flat encapsulation as a special case of the spherical package, and approximate calculations of an encapsulant with a photonic crystal LED or with a photonic quasi crystal LED. These calculations are compared with Monte-Carl...

Moreno, Ivan; Avendano-Alejo, Maximino; 10.1364/AO.49.000012

2011-01-01T23:59:59.000Z

258

The collision and snapping of cosmic strings generating spherical impulsive gravitational waves  

E-Print Network (OSTI)

The Penrose method for constructing spherical impulsive gravitational waves is investigated in detail, including alternative spatial sections and an arbitrary cosmological constant. The resulting waves include those that are generated by a snapping cosmic string. The method is used to construct an explicit exact solution of Einstein's equations describing the collision of two nonaligned cosmic strings in a Minkowski background which snap at their point of collision.

J. Podolsky; J. B. Griffiths

2000-01-17T23:59:59.000Z

259

Calculation of the Solar UV/EUV Spectrum in Spherical Symmetry  

E-Print Network (OSTI)

We present work in progress concerning spectral synthesis calculations of the solar UV/EUV in spherical symmetry carried out with the Solar Radiation Physical Modeling (SRPM) project. We compare the synthetic irradiance spectrum for the quiet Sun with the recent solar minimum spectrum taken with the EVE rocket instrument. The good agreement of the synthetic spectrum with the observation shows that the employed atmosphere structures are suitable for irradiance calculations.

Haberreiter, Margit

2009-01-01T23:59:59.000Z

260

The Energy Distribution in a Static Spherically Symmetric Nonsingular Black Hole Space-Time  

E-Print Network (OSTI)

We calculate the energy distribution in a static spherically symmetric nonsingular black hole space-time by using the Tolman's energy-momentum complex. All the calculations are performed in quasi-Cartesian coordinates. The energy distribution is positive everywhere and be equal to zero at origin. We get the same result as obtained by Y-Ching Yang by using the Einstein's and Weinberg's prescriptions.

I. Radinschi

2000-08-14T23:59:59.000Z

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261

Static spherically symmetric perfect fluid solutions in $f(R)$ theories of gravity  

E-Print Network (OSTI)

Static spherically symmetric perfect fluid solutions are studied in metric $f(R)$ theories of gravity. We show that pressure and density do not uniquely determine $f(R)$ ie. given a matter distribution and an equation state, one cannot determine the functional form of $f(R)$. However, we also show that matching the outside Schwarzschild-de Sitter-metric to the metric inside the mass distribution leads to additional constraints that severely limit the allowed fluid configurations.

T. Multamaki; I. Vilja

2006-12-29T23:59:59.000Z

262

Role of Modified Chaplygin Gas as a Dark Energy Model in Collapsing Spherically Symmetric Cloud  

E-Print Network (OSTI)

In this work, gravitational collapse of a spherical cloud, consists of both dark matter and dark energy in the form of modified Chaplygin gas is studied. It is found that dark energy alone in the form of modified Chaplygin gas forms black hole. Also when both components of the fluid are present then the collapse favors the formation of black hole in cases the dark energy dominates over dark matter. The conclusion is totally opposite to the usually known results.

Ujjal Debnath; Subenoy Chakraborty

2006-01-12T23:59:59.000Z

263

Second Blows in the Head-on Collisions of the Spherical Nano Polymer Droplets  

E-Print Network (OSTI)

We report observations of weird but interesting phenomenon from the molecular dynamics simulations, occurrence of second blows in the head-on collisions of two equal-sized spherical nano polymer droplets. In the head-on collisions, we usually expect a single peak of impact forces between two colliding droplets. But, in the simulations, the second peak of the impact forces is actually observed. Its underlying mechanisms at the molecular scale are also proposed.

Sangrak Kim

2013-10-21T23:59:59.000Z

264

Spherically symmetric self-similar solutions and their astrophysical and cosmological applications  

E-Print Network (OSTI)

We discuss spherically symmetric perfect fluid solutions of Einstein's equations which have equation of state ($p=\\alpha \\mu$) and which are self-similar in the sense that all dimensionless variables depend only upon $z\\equiv r/t$. For each value of $\\alpha$, such solutions are described by two parameters and have now been completely classified. There is a 1-parameter family of solutions asymptotic to the flat Friedmann model at large values of z. These represent either black holes or density perturbations which grow as fast as the particle horizon; the underdense solutions may be relevant to the existence of large-scale cosmic voids. There is also a 1-parameter family of solutions asymptotic to a self-similar Kantowski-Sachs model at large z. These are probably only physically realistic for $-11/5$, there is a family of solutions which are asymptotically Minkowski. These asymptote either to infinite z, in which case they are described by one parameter, or to a finite value of z, in which case they are described by two parameters and this includes the ``critical'' solution for $\\alpha >0.28$. We discuss the stability of spherically symmetric similarity solutions to more general (non-self-similar) spherically symmetric perturbations.

B. J. Carr

2000-03-02T23:59:59.000Z

265

SPHERICAL DIE  

DOE Patents (OSTI)

A die is presented for pressing powdered materials into a hemispherical shape of uniforin density and wall thickness comprising a fcmale and male die element held in a stationary spaced relation with the space being equivalent to the wall thickness and defining the hemispherical shape, a pressing ring linearly moveable along the male die element, an inlet to fill the space with powdered materials, a guiding system for moving the pressing ring along the male die element so as to press the powdered material and a heating system for heating the male element so that the powdered material is heated while being pressed.

Livingston, J.P.

1959-01-27T23:59:59.000Z

266

Lawrence Livermore National Laboratory | National Nuclear Security  

National Nuclear Security Administration (NNSA)

Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory Home > About Us > Our Operations > Acquisition and Project Management > M & O Support Department > Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory DE-AC52-07NA27344 Operated by Lawrence Livermore National Security, LLC BASIC Contract (Official) Modifications (Official) Funding Mods Available Upon Request Conformed Contract (Unofficial) LLNL Sec A (SF33) (pdf, 91KB) See Modifications Section under Conformed Contract Link LLNS Conformed Contract (weblink) LLNL Sec B-H (pdf, 306KB) LLNL Sec I pdf 687KB LLNL Sec J Appx A (pdf, 67KB) LLNL Sec J Appx B (pdf, 191KB) LLNL Sec J Appx C (pdf, 11KB) LLNL Sec J Appx D (pdf, 18KB)

267

Cognitive Informatics, Pacific Northwest National Laboratory | National  

National Nuclear Security Administration (NNSA)

Cognitive Informatics, Pacific Northwest National Laboratory | National Cognitive Informatics, Pacific Northwest National Laboratory | 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 > Who We Are > In The Spotlight > Frank Greitzer Cognitive Informatics, Pacific Northwest National Laboratory Frank Greitzer Frank Greitzer Role: Cognitive Informatics, Pacific Northwest National Laboratory

268

National Renewable Energy Laboratory  

E-Print Network (OSTI)

National Renewable Energy Laboratory Innovation for Our Energy Future ponsorship Format Reversed Color:White rtical Format Reversed-A ertical Format Reversed-B National Renewable Energy Laboratory National Renewable Energy Laboratory Innovation for Our Energy Future National Renewable Energy Laboratory

269

Monotone and Conservative Cascade Remapping between Spherical Grids (CaRS): Regular Latitude–Longitude and Cubed-Sphere Grids  

Science Conference Proceedings (OSTI)

A high-order monotone and conservative cascade remapping algorithm between spherical grids (CaRS) is developed. This algorithm is specifically designed to remap between the cubed-sphere and regular latitude–longitude grids. The remapping approach ...

Peter H. Lauritzen; Ramachandran D. Nair

2008-04-01T23:59:59.000Z

270

Doubling–Adding Method for Delta-Four-Stream Spherical Harmonic Expansion Approximation in Radiative Transfer Parameterization  

Science Conference Proceedings (OSTI)

Though the single-layer solutions have been found for the ?-four-stream spherical harmonic expansion method (SHM) in radiative transfer, there is lack of a corresponding doubling–adding method (4SDA), which enables the calculation of radiative ...

Feng Zhang; Jiangnan Li

2013-10-01T23:59:59.000Z

271

Backscattering Gain Measurements of Spherical Ice Hydrometeors at 35.8 GHz and Comparison to Numerical Computations  

Science Conference Proceedings (OSTI)

A 35.8-GHz scatterometer was tested and used for backscattering gain measurements of spherically shaped artificial hydrometeors varying in composition and size: homogeneous ice with 1.7 ? r ? 15 mm, different volume fractions of air bubbles ...

Franco Prodi; Alvise Moretti; Orazio Sturniolo

1996-04-01T23:59:59.000Z

272

Analytic Solutions for Evolving Size Distributions of Spherical Crystals or Droplets Undergoing Diffusional Growth in Different Regimes  

Science Conference Proceedings (OSTI)

Motivated by simulations of slow-growing contrail cirrus, the solution of the diffusional growth equations for a population of spherical ice crystals or water droplets is reexamined. For forcing specified by the evolution of the total water ...

D. C. Lewellen

2012-02-01T23:59:59.000Z

273

Sandia National Laboratories: National Security Missions: Defense...  

NLE Websites -- All DOE Office Websites (Extended Search)

that help protect U.S. government, military, and civilian computer networks from cyber threats; conduct threat assessments; and work nationally to increase public...

274

Lawrence Livermore National Laboratory | National Nuclear Security...  

National Nuclear Security Administration (NNSA)

contract, which oversees the lab. Additionally, the field office promotes national nuclear safety, executes assigned NNSA and Department of Energy programs and conducts...

275

SLAC National Accelerator Laboratory - SLAC National Accelerator...  

NLE Websites -- All DOE Office Websites (Extended Search)

Security Notice and Terms of Use Updated January 3, 2005 PRIVACY NOTICE Welcome to the SLAC National Accelerator Laboratory website. We collect no personal information about you...

276

Brookhaven National Laboratory The National Synchrotron Light...  

NLE Websites -- All DOE Office Websites (Extended Search)

is one of five nanoscale science research centers (NSRCs) that DOE's Office of Basic Energy Sciences is operating at national laboratories around the country. These centers...

277

Sandia National Laboratories: National Security Missions: Internationa...  

NLE Websites -- All DOE Office Websites (Extended Search)

national security through global technical engagement. Enhance security of vulnerable nuclear weapons stockpiles and weapons-usable nuclear material in countries of concern and...

278

Sandia National Laboratories: National Security Missions: Nuclear...  

NLE Websites -- All DOE Office Websites (Extended Search)

Weapons Science & Technology National labs provide the science and technology to maintain and certify the nuclear stockpile in the absence of full-scale weapons testing. The...

279

Sandia National Laboratories: National Security Missions: Nuclear...  

NLE Websites -- All DOE Office Websites (Extended Search)

Missions Nuclear Weapons Stockpile Stewardship Ensuring the nation's nuclear weapons stockpile is safe, secure, and reliable. About Nuclear Weapons Since 1949, Sandia's scientists...

280

Groundbreaking at National Ignition Facility | National Nuclear...  

National Nuclear Security Administration (NNSA)

NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog Home > About Us > Our History > NNSA Timeline > Groundbreaking at National Ignition Facility...

Note: This page contains sample records for the topic "national spherical torus" 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

A Snowflake-Shaped Magnetic Field Holds Promise for Taming Harsh Fusion  

NLE Websites -- All DOE Office Websites (Extended Search)

A Snowflake-Shaped Magnetic Field Holds Promise for Taming Harsh Fusion A Snowflake-Shaped Magnetic Field Holds Promise for Taming Harsh Fusion Plasmas Recent experiments have confirmed the great potential of a novel plasma-material interface concept. By U.S Department of Energy Office of Science October 31, 2012 Tweet Widget Facebook Like Google Plus One National Spherical Torus Experiment (Photo by Elle Starkman, Office of Communications, PPPL) National Spherical Torus Experiment The Science Heat escaping from the core of a twelve-million degree nuclear fusion plasma device was successfully contained by a snowflake-shaped magnetic field to mitigate its impact on device walls. The Impact One of the grand challenges of the magnetic fusion research is to "tame the plasma-material interface"-to develop an interface between the hot

282

Current Projects | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Current Current Projects Princeton Site Office (PSO) PSO Home About Current Projects Contract Management Environment, Safety and Health (ES&H) Contact Information Princeton Site Office U.S. Department of Energy P.O. Box 102 Princeton, NJ 08543 P: (609) 243-3700 F: (609) 243-2032 Current Projects Print Text Size: A A A RSS Feeds FeedbackShare Page National Spherical Torus Experiment (NSTX) The National Spherical Torus Experiment (NSTX) at the U.S. Department of Energy's Princeton Plasma Physics Laboratory (PPPL) is yielding research results that may open an attractive path towards developing fusion energy as an abundant, safe, affordable and environmentally sound means of generating electricity. The NSTX device is exploring a novel structure for the magnetic field used to contain the hot ionized gas, called

283

Responding to National Needs : The National Bureau of ...  

Science Conference Proceedings (OSTI)

Page 1. THE NATIONAL INSTITUTE OF STANDARDS AND F. TECHNOLOGY NIST National Institute of NIST Standards ...

284

Biology Department - Brookhaven National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Physics of STEM A. Probe Size The probe size in a properly aligned STEM (with a field emission source) is limited by spherical aberration of the final objective lens and by...

285

Sandia National Laboratories | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Sandia National Laboratories Sandia National Laboratories Home > About Us > Our Operations > Acquisition and Project Management > M & O Support Department > Sandia National Laboratories Sandia National Laboratories Sandia National Laboratories DE-AC04-94AL85000 Operated by Sandia Corporation a Subsidiary of Lockheed Martin Corporation Contract Updated to Modification 515 dated 09/09/2013 View previous Sandia Contract and Mods (M081-A201). BASIC Contract (Official) Modifications (Official) Funding Mods Available Upon Request Conformed Contract (Updated to Mod 515 dated 09/09/2013) (Unofficial) SNL M202 Section A (Supersedes Basic and all Mods) (pdf, 397KB) SNL M216 (9/15/04) (pdf, 439KB) SNL M202 SecA (Supersedes Basic and all Mods) (pdf, 397KB) SNL Sec B-H (doc, 314KB) SNL M218

286

Nonproliferation and National Security Multimedia - Argonne National  

NLE Websites -- All DOE Office Websites (Extended Search)

Nonproliferation and National Security Nonproliferation and National Security > Multimedia Multimedia Nuclear Systems Analysis Engineering Analysis Nonproliferation and National Security Detection & Diagnostic Systems Engineering Development & Applications Argonne's Nuclear Science & Technology Legacy Other Multimedia Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Bookmark and Share Nonproliferation and National Security: Multimedia Related Resources Nonproliferation and National Security Vulnerability Assessment Team (VAT) Click on the "Date" header to sort the videos/podcasts in chronological order (ascending or descending). You may also search for a specific keyword; click on the reset button refresh to remove the keyword filter and show again all the Videos/Podcasts.

287

NSTX Diagnostics and Operation: Status and Plans  

SciTech Connect

The low aspect ratio and low magnetic field of the National Spherical Torus Experiment (NSTX) create many challenges for plasma diagnostics and control, as well as opportunities for studying new plasma phenomena. This paper describes the diagnostics now installed for studies of confinement, stability and edge plasma phenomena, and some of the diagnostic developments planned for the near future. The design of the plasma control system and plans for its development are also presented.

M.G. Bell; R.E. Bell; B.P. LeBlanc; S.S. Medley; and the NSTX Research Team

2001-08-30T23:59:59.000Z

288

Neutral Particle Analyzer Diagnostic on NSTX  

DOE Green Energy (OSTI)

The Neutral Particle Analyzer (NPA) diagnostic on the National Spherical Torus Experiment (NSTX) utilizes a PPPL-designed E||B spectrometer that measures the energy spectra of minority hydrogen and bulk deuterium species simultaneously with 39 energy channels per mass specie and a time resolution of 1 ms. The calibrated energy range is E = 0.5-150 keV and the energy resolution varies from AE/E = 3-7% over the surface of the microchannel plate detector.

S.S. Medley; A.L. Roquemore

2004-03-16T23:59:59.000Z

289

Fragmentation of spherical radioactive heavy nuclei as a novel probe of transient effects in fission  

E-Print Network (OSTI)

Peripheral collisions with radioactive heavy-ion beams at relativistic energies are discussed as an innovative approach for probing the transient regime experienced by fissile systems evolving towards quasi-equilibrium. A dedicated experiment using the advanced technical installations of GSI, Darmstadt, permitted to realize ideal conditions for the investigation of relaxation effects in the meta-stable well. Combined with a highly sensitive experimental signature, it provides a measure of the transient effects with respect to the flux over the fission barrier. Within a two-step reaction process, 45 proton-rich unstable spherical isotopes produced by projectile-fragmentation of a stable 238U beam have been used as secondary projectiles. The fragmentation of the radioactive projectiles on lead results in nearly spherical compound nuclei which span a wide range in excitation energy and fissility. The decay of these excited systems by fission is studied with a dedicated set-up which permits the detection of both fission products in coincidence and the determination of their atomic numbers with high resolution. The width of the fission-fragment nuclear charge distribution is shown to be specifically sensitive to pre-saddle transient effects and is used to establish a clock for the passage of the saddle point. The comparison of the experimental results with model calculations points to a fission delay of (3.3+/-0.7).10-21s for initially spherical compound nuclei, independent of excitation energy and fissility. This value suggests a nuclear dissipation strength at small deformation of (4.5+/-0.5).1021s-1. The very specific combination of the physics and technical equipment exploited in this work sheds light on previous controversial conclusions.

C. Schmitt; K. -H. Schmidt; A. Keli?; A. Heinz; B. Jurado; P. N. Nadtochy

2010-04-07T23:59:59.000Z

290

Complete model of a spherical gravitational wave detector with capacitive transducers. Calibration and sensitivity optimization  

E-Print Network (OSTI)

We report the results of a detailed numerical analysis of a real resonant spherical gravitational wave antenna operating with six resonant two-mode capacitive transducers read out by superconducting quantum interference devices (SQUID) amplifiers. We derive a set of equations to describe the electro-mechanical dynamics of the detector. The model takes into account the effect of all the noise sources present in each transducer chain: the thermal noise associated with the mechanical resonators, the thermal noise from the superconducting impedance matching transformer, the back-action noise and the additive current noise of the SQUID amplifier. Asymmetries in the detector signal-to-noise ratio and bandwidth, coming from considering the transducers not as point-like objects but as sensor with physically defined geometry and dimension, are also investigated. We calculate the sensitivity for an ultracryogenic, 30 ton, 2 meter in diameter, spherical detector with optimal and non-optimal impedance matching of the electrical read-out scheme to the mechanical modes. The results of the analysis is useful not only to optimize existing smaller mass spherical detector like MiniGrail, in Leiden, but also as a technological guideline for future massive detectors. Furthermore we calculate the antenna patterns when the sphere operates with one, three and six resonators. The sky coverage for two detectors based in The Netherlands and Brasil and operating in coincidence is also estimated. Finally, we describe and numerically verify a calibration and filtering procedure useful for diagnostic and detection purposes in analogy with existing resonant bar detectors.

Luciano Gottardi

2006-08-20T23:59:59.000Z

291

Spacetime structure of self-similar spherically symmetric perfect fluid solutions  

E-Print Network (OSTI)

We classify all spherically symmetric and homothetic spacetimes that are allowed kinematically by constructing them from a small number of building blocks. We then restrict attention to a particular dynamics, namely perfect fluid matter with the scale-free barotropic equation of state p = alpha mu where 0

B. J. Carr; Carsten Gundlach

2002-09-24T23:59:59.000Z

292

Velocity and Timing of Multiple Spherically Converging Shock Waves in Liquid Deuterium  

Science Conference Proceedings (OSTI)

The fuel entropy and required drive energy for an inertial confinement fusion implosion are set by a sequence of shocks that must be precisely timed to achieve ignition. This Letter reports measurements of multiple spherical shock waves in liquid deuterium that facilitate timing inertial confinement fusion shocks to the required precision. These experiments produced the highest shock velocity observed in liquid deuterium (U{sub s}=135 km/s at {approx}2500 GPa) and also the first observation of convergence effects on the shock velocity. Simulations model the shock-timing results well when a nonlocal transport model is used in the coronal plasma.

Boehly, T. R.; Goncharov, V. N.; Seka, W.; Hu, S. X.; Marozas, J. A. [Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299 (United States); Barrios, M. A.; Celliers, P. M.; Hicks, D. G.; Collins, G. W. [Lawrence Livermore National Laboratory, Livermore, California 94551 (United States); Meyerhofer, D. D. [Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299 (United States); Departments of Mechanical Engineering and Physics, University of Rochester, Rochester, New York 14623 (United States)

2011-05-13T23:59:59.000Z

293

ABAREX -- A neutron spherical optical-statistical-model code -- A user`s manual  

SciTech Connect

The contemporary version of the neutron spherical optical-statistical-model code ABAREX is summarized with the objective of providing detailed operational guidance for the user. The physical concepts involved are very briefly outlined. The code is described in some detail and a number of explicit examples are given. With this document one should very quickly become fluent with the use of ABAREX. While the code has operated on a number of computing systems, this version is specifically tailored for the VAX/VMS work station and/or the IBM-compatible personal computer.

Smith, A.B. [ed.; Lawson, R.D.

1998-06-01T23:59:59.000Z

294

Spherically symmetric solutions of modified field equations in f(R) theories of gravity  

E-Print Network (OSTI)

Spherically symmetric static empty space solutions are studied in f(R) theories of gravity. We reduce the set of modified Einstein's equations to a single equation and show how one can construct exact solutions in different f(R) models. In particular, we show that for a large class models, including e.g. the f(R)=R-\\mu^4/R model, the Schwarzschild-de Sitter metric is an exact solution of the field equations. The significance of these solutions is discussed in light of solar system constraints on $f(R)$ theories of gravity.

Tuomas Multamaki; Iiro Vilja

2006-06-15T23:59:59.000Z

295

Spherical Symmetric Solution in f(R) Model Around Charged Black Hole  

E-Print Network (OSTI)

A static, asymptotically flat, spherically symmetric solutions is investigated in f(R) theories of gravity for a charged black hole. We have studied the weak field limit of f(R) gravity for the some f(R) model such as f(R) = R + epsilon h(R). In particular, weconsider the case lim_{R =0} {h(R)/ dh(R)/dR}=0 and find the space time metric for f(R) = R + {mu}^{4} /R and f(R) = R^{1-epsilon} theories of gravity far away a charged mass point.

A. Aghamohammadi; Kh. Saaidi; M. R. Abolhasani; A. Vajdi

2010-01-23T23:59:59.000Z

296

Formation of sheet plumes, current coils, and helical magnetic fields in a spherical magnetohydrodynamic dynamo  

Science Conference Proceedings (OSTI)

Aiming at understanding of magnetic field generation process in rapidly rotating stars and planets represented by the Earth, computer simulations of magnetohydrodynamic (MHD) dynamo were performed in a rotating spherical shell geometry. Thermal convection and dynamo process with Ekman number of the order of 10{sup -7} were studied. New structures of convection motion, dynamo-generated electrical current, and magnetic field are found. The flow is organized as a set of thin, sheet-like plumes. The current is made of small-scale coil structure with magnetic flux tubes within each of the coil. These flux tubes are connected each other to form a large scale helical magnetic field structure.

Miyagoshi, Takehiro [Japan Agency for Marine-Earth Science and Technology, Yokohama 236-0001 (Japan); Kageyama, Akira [Graduate School of System Informatics, Kobe University, Kobe 657-8501 (Japan); Sato, Tetsuya [Graduate School of Simulation Studies, University of Hyogo, Kobe 650-0047 (Japan)

2011-07-15T23:59:59.000Z

297

SANDIA NATIONAL LABORATORIES  

NLE Websites -- All DOE Office Websites (Extended Search)

Impacts on Sandia and the Nation Impacts on Sandia and the Nation 2 SANDIA NATIONAL LABORATORIES 3 LDRD Impacts on Sandia and the Nation For further information, contact: Wendy R. Cieslak Senior Manager, Science, Technology, and Engineering Strategic Initiatives wrciesl@sandia.gov (505) 844-8633 or Henry R. Westrich LDRD Program Manager hrwestr@sandia.gov 505-844-9092 LDRD Impacts on Sandia and the Nation ABOUT THE COVER: Images from some of the case studies in this brochure: a near-UV light- emitting diode (LED), a cell membrane, a NISAC model, synthetic aperture radar (SAR) image of Washington, D.C. LABORATORY DIRECTED RESEARCH AND DEVELOPMENT 4 SANDIA NATIONAL LABORATORIES 5 LDRD Impacts on Sandia and the Nation Sandia National Laboratories' Laboratory Directed Research and Development (LDRD) Program:

298

National Vulnerability Database (NVD)  

Science Conference Proceedings (OSTI)

... Technology (NIST) Computer Security Division and is sponsored by the Department of Homeland Security's (DHS) National Cyber Security Division ...

2013-03-06T23:59:59.000Z

299

Savannah River National Laboratory  

At a glance Remote Electrical Throw Device Engineers at the Savannah River National Laboratory ... sufficient manufacturing capacity, established dist ...

300

National Renewable Energy Laboratory  

National Renewable Energy Laboratory Technology Transfer Marine Corps Taps NREL to Help Replace Aging Steam Plant with Efficient Biomass Cogeneration

Note: This page contains sample records for the topic "national spherical torus" 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

Engineer, Sandia National Laboratories | National Nuclear Security  

National Nuclear Security Administration (NNSA)

Sandra Begay-Campbell Sandra Begay-Campbell Engineer, Sandia National Laboratories Sandra Begay-Campbell Sandra Begay-Campbell Role: Engineer, Sandia National Laboratories Award: Ely S. Parker Award Profile: Sandra Begay-Campbell, a Sandia National Laboratories engineer and a member of the Navajo Nation, was selected for the prestigious Ely S. Parker Award by the American Indian Science and Engineering Society at an honors banquet Oct. 31 in Portland, Ore. Begay-Campbell, who has worked at Sandia for 17 years and is a principal member of the technical staff, received the Lifetime Achievement Award, AISES's highest honor, which recognizes American Indians who have "made significant long-term contributions in the sciences, mathematics, engineering, technology, health, or related fields."

302

Sandia National Laboratories | National Nuclear Security Administratio...  

National Nuclear Security Administration (NNSA)

Excellence at ceremonies this year at Sandia National Laboratories in New Mexico and California. The NNSA Defense Programs Awards of Excellence were created in the early 1980s to...

303

COHERENT BACKSCATTERING VERIFIED NUMERICALLY FOR A FINITE VOLUME OF SPHERICAL PARTICLES  

Science Conference Proceedings (OSTI)

We consider electromagnetic scattering by a spherical volume sparsely and randomly populated by spherical particles of equal size and optical properties. The far-field scattering matrix of the entire volume is computed using an exact method and an approximate method. The former is a direct computer solver of the Maxwell equations called the superposition T-matrix method (STMM). The latter is a solver based on numerical Monte Carlo integration of the ladder and cyclical diagrams appearing in the microphysical theory of radiative transfer and coherent backscattering (RT-CB). The quantitative agreement between the STMM and RT-CB computations provides verification of the RT-CB theory. Prominent backscattering features exhibited by the STMM data cannot be reproduced by keeping only the ladder diagrams of RT. Our results strongly support the CB explanation of opposition brightness and polarization phenomena observed for a class of atmosphereless solar-system objects. Further research is necessary to determine the range of quantitative applicability of the RT-CB theory to densely packed particulate media.

Muinonen, K.; Zubko, E.; Penttilae, A. [Department of Physics, University of Helsinki, Gustaf Haellstroemin katu 2a, FI-00014 U. Helsinki (Finland); Mishchenko, M. I. [NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025 (United States); Dlugach, J. M. [Main Astronomical Observatory, National Academy of Sciences of Ukraine, 27 Zabolotny Street, 03680 Kyiv (Ukraine); Videen, G., E-mail: karri.muinonen@helsinki.fi, E-mail: evgenij.zubko@helsinki.fi, E-mail: antti.i.penttila@helsinki.fi, E-mail: michael.i.mishchenko@nasa.gov, E-mail: dl@mao.kiev.ua, E-mail: gorden.videen@gmail.com [Army Research Laboratory, Adelphi, MD 20783 (United States)

2012-12-01T23:59:59.000Z

304

Polar studies of the sphericity degree of V/HTR nuclear fuel particles  

SciTech Connect

Advanced nuclear power reactor designs such as (Very) High Temperature Reactors (V/HTR) employ TRISO fuel particles that typically have a sub-millimetre U-based fuel kernel coated with three isotropic ceramic layers-a layer of silicon carbide sandwiched between pyrocarbon layers of different density. Evaluation of the ceramic layer thickness and of the degree of sphericity of these typical nuclear fuel particles is required at each step of the fabrication, in order to estimate future fuel performance under irradiation conditions. This study is based on the image processing of polished cross-sections, realized near the equatorial plane. From these 2D images, some measurements are carried out, giving an estimation of the diameter values for a sample of particles at each step of the coating process. These values are then statistically extended to the third dimension in order to obtain the thickness of each layer and the degree of sphericity of each particle. A representation of diameter and layer thickness in polar coordinates enables one to identify steps for which the coating process is defective or deviating from nominal objectives.

Robert-Inacio, F. [Institut Superieur de l'Electronique et du Numerique de Toulon, L2MP UMR CNRS 6137, place Pompidou, F-83000 Toulon (France)]. E-mail: frederique.robert@isen.fr; Boschet, C. [Institut Superieur de l'Electronique et du Numerique de Toulon, L2MP UMR CNRS 6137, place Pompidou, F-83000 Toulon (France); Charollais, F. [CEA Cadarache, DEN/CAD/DEC/SPUA, Bat. 315, BP1, 13108 Saint Paul lez Durance (France)]. E-mail: francois.charollais@cea.fr; Cellier, F. [Framatome ANP, an AREVA and Siemens Company, Plants Sector, 10, rue Juliette Recamier, 69456 Lyon Cedex 06 (France)

2006-06-15T23:59:59.000Z

305

Electric potential profile of a spherical soft particle with a charged core  

E-Print Network (OSTI)

The electrostatic potential profile of a spherical soft particle is derived by solving the Poisson-Boltzmann equations on a spherical system both numerically and analytically. The soft particle is assumed to consist of an ion-permeable charged outer layer and a non-permeable charged core with constant charged density. The contribution of the core to the potential profile is calculated for different charges and dielectric constants. Our results show that the charged core heavily influences the local potential within the soft particle. In contrast, the potential distribution outside the particle in the salt solution is found to be weakly dependent on the core features. These findings are consistent with previous experiments showing the minor impact of the core of the MS2 virus on its overall electrical properties. Our studies also indicate that while a change in temperature from 290 K to 310 K only slightly varies the potential, the ionic strength in the range of 1-600 mM has a significant effect on the potential profile. Our studies would provide good understanding for experimental research in the field of biophysics and nanomedicine.

Anh D. Phan; Dustin A. Tracy; T. L. Hoai Nguyen; N. A. Viet; The-Long Phan; Thanh H. Nguyen

2013-12-05T23:59:59.000Z

306

Nonlinear effects in the extraction of laminar flame speeds from expanding spherical flames  

Science Conference Proceedings (OSTI)

Various factors affecting the determination of laminar flames speeds from outwardly propagating spherical flames in a constant-pressure combustion chamber were considered, with emphasis on the nonlinear variation of the stretched flame speed to the flame stretch rate, and the associated need to nonlinearly extrapolate the stretched flame speed to yield an accurate determination of the laminar flame speed and Markstein length. Experiments were conducted for lean and rich n-butane/air flames at 1atm initial pressure, demonstrating the complex and nonlinear nature of the dynamics of flame evolution, and the strong influences of the ignition transient and chamber confinement during the initial and final periods of the flame propagation, respectively. These experimental data were analyzed using the nonlinear relation between the stretched flame speed and stretch rate, yielding laminar flame speeds that agree well with data determined from alternate flame configurations. It is further suggested that the fidelity in the extraction of the laminar flame speed from expanding spherical flames can be facilitated by using small ignition energy and a large combustion chamber. (author)

Kelley, A.P.; Law, C.K. [Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544 (United States)

2009-09-15T23:59:59.000Z

307

Leadership | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Message from the Director Board of Governors Organization Chart Argonne Distinguished Fellows Emeritus Scientists & Engineers History Discoveries Prime Contract Contact Us Leadership Argonne integrates world-class science, engineering, and user facilities to deliver innovative research and technologies. We create new knowledge that addresses the scientific and societal needs of our nation. Eric D. Isaacs Eric D. Isaacs, Director, Argonne National Laboratory Director, Argonne National Laboratory Argonne National Laboratory Eric D. Isaacs, a prominent University of Chicago physicist, is President of UChicago Argonne, LLC, and Director of Argonne National Laboratory. Mark Peters Mark Peters, Deputy Lab Director for Programs Deputy Laboratory Director for Programs

308

Linear stability of spherically symmetric and wormhole solutions supported by the sine-Gordon ghost scalar field  

Science Conference Proceedings (OSTI)

In this paper we investigate wormhole and spherically symmetric solutions in four-dimensional gravity plus a matter source consisting of a ghost scalar field with a sine-Gordon potential. For the wormhole solutions we also include the possibility of electric and/or magnetic charges. For both types of solutions we perform a linear stability analysis and show that the wormhole solutions are stable and that when one turns on the electric and/or magnetic field the solution remains stable. The linear stability analysis of the spherically symmetric solutions indicates that they can be stable or unstable depending on one of the parameters of the system. This result for the spherically symmetric solution is nontrivial since a previous investigation of four-dimensional gravity plus a ghost scalar field with a {lambda}{phi}{sup 4} interaction found only unstable spherically symmetric solutions. Both the wormhole and spherically symmetric solutions presented here asymptotically go to anti-de Sitter space-time.

Dzhunushaliev, Vladimir [Institute for Basic Research, Eurasian National University, Astana, 010008 (Kazakhstan); Institute of Physicotechnical Problems and Material Science of the NAS of the Kyrgyz Republic, 265 a, Chui Street, Bishkek, 720071 (Kyrgyzstan); Institut fuer Physik, Universitaet Oldenburg, Postfach 2503 D-26111 Oldenburg (Germany); Folomeev, Vladimir [Institute of Physicotechnical Problems and Material Science of the NAS of the Kyrgyz Republic, 265 a, Chui Street, Bishkek, 720071 (Kyrgyzstan); Institut fuer Physik, Universitaet Oldenburg, Postfach 2503 D-26111 Oldenburg (Germany); Singleton, Douglas [Physics Department, CSU Fresno, Fresno, California 93740-8031 (United States); Myrzakulov, Ratbay [Eurasian International Center for Theoretical Physics and Department of General and Theoretical Physics, Eurasian National University, Astana, 010008 (Kazakhstan)

2010-08-15T23:59:59.000Z

309

Argonne National Laboratory - Reports  

NLE Websites -- All DOE Office Websites (Extended Search)

Reports Reports Argonne National Laboratory Activity Reports 2012 Operational Awareness Oversight of the Argonne National Laboratory Alpha-Gamma Hot Cell Facility, July 2012 Review Reports 2011 Review of the Argonne National Laboratory Alpha-Gamma Hot Cell Facility Readiness Assessment (Implementation Verification Review Sections), November 2011 Nuclear Safety Enforcement Regulatory Assistance Review of UChicago Argonne, LLC at the Argonne National Laboratory, October 3, 2011 Activity Reports 2011 Orientation Visit to the Argonne National Laboratory, August 2011 Review Reports 2005 Independent Oversight Inspection of Environment, Safety and Health Programs at Argonne National Laboratory, Summary Report, Vol. 1, May, 2005 Independent Oversight Inspection of Environment, Safety, and Health Programs at the Argonne National Laboratory, Technical Appendices, Volume II, May 2005

310

National Transmission Grid Study  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Grid Study Grid Study U.S. Department of Energy The Honorable Spencer Abraham Secretary of Energy May 2002 ii National Transmission Grid Study National Transmission Grid Study i ii National Transmission Grid Study National Transmission Grid Study iii How This Study Was Conducted The National Energy Policy Plan directed the U.S. Department of Energy (DOE) to conduct a study to examine the benefits of establishing a national electricity transmission grid and to identify transmission bottlenecks and measures to address them. DOE began by conducting an independent analysis of U.S. electricity markets and identifying transmission system bottlenecks using DOE's Policy Office Electricity Modeling System (POEMS). DOE's analysis, presented in Section 2, confirms the central role of the nation's transmission

311

Vehicle Technologies Office: National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

National Laboratories to someone by E-mail Share Vehicle Technologies Office: National Laboratories on Facebook Tweet about Vehicle Technologies Office: National Laboratories on...

312

Laser induced thermal-wave fields in multi-layered spherical solids based on Green function method  

Science Conference Proceedings (OSTI)

In this paper, we establish a Green-function based theoretical model for evaluating solid multi-layered spherical samples which are illuminated by a frequency modulated incident beam. The specific Green function for the multi-layered spherical structure is derived and an analytical expression for the thermal-wave field in such a spherical sample is presented. The characteristics of the thermal-wave field with respect to the thermophysical, geometrical, and measurement parameters are presented. Unlike the quadruple method, the Green function method is capable of evaluating thermal-wave fields at any point of multi-layered structures with arbitrary intensity distributions of incident laser beams. Furthermore, experimental validation is also presented in the form of experimental results with steel spheres of various diameters.

Zhang Jie; Wang Chinhua [Key Lab of Modern Optical Technologies of Jiangsu Province, Institute of Modern Optical Technologies, Soochow University, Suzhou, Jiangsu 215006 (China); Xie Guangxi [Key Lab of Modern Optical Technologies of Jiangsu Province, Institute of Modern Optical Technologies, Soochow University, Suzhou, Jiangsu 215006 (China); Department of Physics, Jiangnan University, Wuxi, Jiangsu 214122 (China); Mandelis, Andreas [Center for Advanced Diffusion-Wave Technologies (CADIFT), Department of Mechanical and Industrial Engineering, University of Toronto, M5S 3G8 Ontario (Canada)

2012-08-01T23:59:59.000Z

313

NNSA interns visit Sandia National Laboratories | National Nuclear...  

National Nuclear Security Administration (NNSA)

interns visit Sandia National Laboratories | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy...

314

Sandia National Laboratories | National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

Kevin Eklund Kevin Eklund Sandia National Laboratories Kevin Eklund Kevin Eklund Role: Sandia National Laboratories Profile: Two individuals and nine teams received the NNSA Defense Programs Awards of Excellence at ceremonies this year at Sandia National Laboratories in New Mexico and California. The NNSA Defense Programs Awards of Excellence were created in the early 1980s to give special recognition to those at the laboratories and plants directly associated with the stockpile modernization program. Today, the awards honor exceptional contributions to the stewardship and management of the stockpile. Kevin Eklund is recognized for outstanding technical leadership of Sandia's responsibilities in successfully achieving the B61 ALT 357 Life Extension Program (LEP). Kevin led the majority of the qualification testing for the

315

Researcher, Lawrence Livermore National Laboratory | National Nuclear  

National Nuclear Security Administration (NNSA)

Bruce Macintosh Bruce Macintosh Researcher, Lawrence Livermore National Laboratory Bruce Macintosh Bruce Macintosh Role: Researcher, Lawrence Livermore National Laboratory Award: AAAS Newcomb Cleveland Prize Profile: A Lawrence Livermore National Laboratory researcher's paper published in November 2008 is co-winner of this year's American Association for the Advancement of Science (AAAS) Newcomb Cleveland Prize. The Paper is one of two outstanding papers published in Science from June 1, 2008 through May 31, 2009. Bruce Macintosh of the Physics and Life Science Directorate was one of the lead authors of the paper titled, "Direct Imaging of Multiple Planets orbiting the Star HR 8799," which appeared in the Nov. 28, 2008 edition of Science. Christian Marois, a former LLNL postdoc now at NRC Herzberg

316

Investigation of Ion Absorption of the High Harmonic Fast Wave in NSTX using HPRT  

DOE Green Energy (OSTI)

Understanding high harmonic fast wave (HHFW) power absorption by ions in a spherical torus (ST) is of critical importance to assessing the wave's viability as a means of heating and especially driving current. In this work, the HPRT code is used to calculate absorption for helium and deuterium, with and without minority hydrogen in National Spherical Torus Experiment (NSTX) plasmas using experimental EFIT code equilibria and kinetic profiles. HPRT is a two-dimensional ray-tracing code which uses the full hot plasma dielectric to compute the perpendicular wave number along the hot electron and cold ion plasma ray path. Ion and electron absorption dependence on antenna phasing, ion temperature, beta (subscript t), and minority temperature and concentration is analyzed. These results form the basis for comparisons with other codes, such as CURRAY, METS, TORIC, and AORSA.

Rosenberg, A.; Menard, J.E.; and LeBlanc, B.P.

2001-05-18T23:59:59.000Z

317

National Security Science Archive  

NLE Websites -- All DOE Office Websites (Extended Search)

National Security Science » National Security Science » NSS Archive National Security Science magazine Latest Issue:April 2013 All Issues » submit National Security Science Archive Using its broad and unique scientific and engineering capabilities, the Laboratory solves a diverse set of challenges to national and global security and the weapons programs. National Security Science magazine showcases the breadth and depth of the Laboratory's scientific and technical work to policy makers, the general public, academia, and scientific and technical experts. past issues cover Issue 2 2012 interactive | web | pdf past issues cover Issue 1 2012 interactive | web | pdf past issues cover Issue 3 2011 web | pdf past issues cover Issue 2 2011 web | pdf past issues cover Issue 1 2011 web | pdf past issues cover

318

National Nuclear Security Administration  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

National Nuclear Security Administration Finding of No Significant Impact for the Construction and Operation of a New Office Building and Related Structures within TA-3 at Los Alamos National Laboratory, Los Alamos, New Mexico U. S. Department of Energy National Nuclear Security Administration Los Alamos Area Office 528 35th Street Los Alamos, N M 8 7 5 4 4 DEPARTMENT OF ENERGY. NATIONAL NUCLEAR SECUIRTY ADMINISTRATION FINDING OF NO SIGNIFICANT INIPACT Construction and Operation of a New Office Building and Related Structures withinTA-3 at Los Alarnos National Laboratory, Los Alamos. New Mexico FINAL ENVIRONMENTAL ASSESSMENT: The Environmental Assessment (EA) for Construction and Operation of a New Office Building and Related Structures within TA-3 at L os Alamos National Laboratory, Los Alamos, New Mexico (DOE/EA- 7 375)

319

National Nuclear Security Administration  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

AI~W~~l AI~W~~l 11Vl'~~4 National Nuclear Security Administration Department of Energy National Nuclear Security Administration Nevada Site Office P.O. Box 98518 Las Vegas, NV 89193-8518 JAN! 8 2013 Gregory H. Woods, General Counsel, DOE/HQ (GC-1) FORS NATIONAL NUCLEAR SECURITY ADMINISTRATION NEVADA SITE OFFICE (NNSA/NSO) NATIONAL ENVIRONMENTAL POLICY ACT (NEPA) ANNUAL SUMMARY In accordance with DOE Order 451.1B, National Environmental Policy Act Compliance Program, NNSA/NSO is submitting the enclosed Annual NEP A Planning Summary. The document provides a brief description of ongoing and planned NEP A actions for calendar year 2013. This summary provides information for completion of the Site- Wide Environmental Impact Statement for the Nevada National Security Site and Off-Site Locations in the State of Nevada.

320

National Energy Policy  

NLE Websites -- All DOE Office Websites (Extended Search)

National Energy Policy National Energy Policy Reliable, Affordable, and Environmentally Sound Energy for America's Future Report of the National Energy Policy Development Group "The National Energy Policy released today by President Bush marks an historic first step to addressing long-neglected energy challenges. Given our growing economy and rising standard of living we are faced with an energy crisis. The President's National Energy Plan balances America's supply needs through technology, diversity of supply and conservation and paves the way for America's energy future." -- Secretary of Energy, Spencer Abraham Complete Report of the National Energy Policy Development Group [PDF-2500KB] By individual chapter: Foreword [PDF-224KB] Overview [PDF-142KB] Chapter 1 - Taking Stock [PDF-1070KB]

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321

National Nuclear Security Administration  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

National Nuclear Security Administration National Nuclear Security Administration Ofice of Secure Transportation mKlK= Box RQMM= ^luquerqueI= kj= UTNUR= ;JAN 03 213 MEMORANDUM FOR GREGORY eK= WOODS GENERAL COUNSEL DEPARTMENT OF ENERGY FROM: SUBJECT: JEFFREY P. HARREL ASSIST ANT DEPU FOR SECURE 2013 ANNUAL PLANNING SUMMARY In response to your memorandum of December TI= 2012, the following information is provided for the National Nuclear Security Administration Ofice of Secure

322

In-Flight Measurements of Capsule Adiabats in Laser Driven Spherical Implosions  

SciTech Connect

We present the first x-ray Thomson scattering measurements of temperature and density from spherically imploding matter. The shape of the Compton downscattered spectrum provides a first-principles measurement of the electron velocity distribution function, dependent on T{sub e} and the Fermi temperature T{sub F} {approx} n{sub e}{sup 2/3}. In flight compressions of Be and CH targets reach 6-13 times solid density, with T{sub e}/T{sub F} {approx} 0.4-0.7, resulting in minimum adiabats of {approx}1.6-2. These measurements are consistent with low-entropy implosions and predictions by simulations using radiation-hydrodynamic modeling.

Kritcher, A L; Doppner, T; Fortman, C; Ma, T; Landen, O L; Wallace, R; Glenzer, S H

2011-03-07T23:59:59.000Z

323

Spherically symmetric Jordan-Brans-Dicke quantum gravity with de Broglie Bohm pilot wave perspective  

E-Print Network (OSTI)

We obtain two dimensional analogue of the Jordan-Brans-Dicke (JBD) gravity action described in four dimensional spherically symmetric curved space time metric. There will be two scalar fields, namely, the Brans Dicke (BD) $\\phi$ and scale factor of 2-sphere part of the space time $\\psi.$ There is obtained a suitable duality transformation between $(\\psi,\\phi)$ and $(\\rho,S)$ where $\\rho$ and $S$ are respectively amplitude and phase part of the corresponding de Broglie pilot wave function $\\Psi(\\rho,S)=\\sqrt{\\rho}e^{iS}.$ There is established covariant conservation of mass-energy current density of particles ensemble $J_a=\\rho\\partial_aS,$ in a particular dynamical conformal frame described by $(\\rho,S).$

Hossein Ghaffarnejad

2013-09-23T23:59:59.000Z

324

Spherical shock-ignition experiments with the 40 + 20-beam configuration on OMEGA  

Science Conference Proceedings (OSTI)

Spherical shock-ignition experiments on OMEGA used a novel beam configuration that separates low-intensity compression beams and high-intensity spike beams. Significant improvements in the performance of plastic-shell, D{sub 2} implosions were observed with repointed beams. The analysis of the coupling of the high-intensity spike beam energy into the imploding capsule indicates that absorbed hot-electron energy contributes to the coupling. The backscattering of laser energy was measured to reach up to 36% at single-beam intensities of {approx}8 Multiplication-Sign 10{sup 15} W/cm{sup 2}. Hard x-ray measurements revealed a relatively low hot-electron temperature of {approx}30 keV independent of intensity and timing. At the highest intensity, stimulated Brillouin scattering occurs near and above the quarter-critical density and the two-plasmon-decay instability is suppressed.

Theobald, W.; Anderson, K. S.; Delettrez, J. A.; Glebov, V. Yu.; Gotchev, O. V.; Hohenberger, M.; Hu, S. X.; Marshall, F. J.; Sangster, T. C.; Seka, W.; Stoeckl, C.; Yaakobi, B. [Laboratory for Laser Energetics and Fusion Science Center, University of Rochester, Rochester, New York 14623 (United States); Nora, R.; Betti, R.; Meyerhofer, D. D. [Laboratory for Laser Energetics and Fusion Science Center, University of Rochester, Rochester, New York 14623 (United States); Department of Mechanical Engineering and Physics at the University of Rochester, Rochester, New York 14623 (United States); Lafon, M. [Laboratory for Laser Energetics and Fusion Science Center, University of Rochester, Rochester, New York 14623 (United States); University of Bordeaux, CEA, CNRS, CELIA (Centre Lasers Intenses et Applications), F-33400 Talence (France); Casner, A. [CEA, DAM, DIF, F-91297 Arpajon (France); Ribeyre, X.; Schurtz, G. [University of Bordeaux, CEA, CNRS, CELIA (Centre Lasers Intenses et Applications), F-33400 Talence (France); Frenje, J. A. [Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); and others

2012-10-15T23:59:59.000Z

325

A homogenization approach to the yield strength of spherical powder compacts  

SciTech Connect

Optimal external estimates of the macroscopic strength criteria of a hexagonal array of identical spherical grains, under isostatic and closed die compaction, have been obtained through the use of the kinematic approach of the yield design homogenization method. Two appropriate unit cells, one for each stage compaction (I and II), and eight relevant failure mechanisms are considered. For comparison purposes, numerical simulations based on FEA similar to those of Ogbana and Fleck [1] have also been carried out. The shapes and sizes of the macroscopic yield surfaces are determined at various stages of compaction and it has been found in particular that they depend upon the loading history as well as the relative density of the compact.

Benabbes, A.; Siad, L. [URCA/GRESPI, Universite de Reims, UFR SEN, B.P. 1039, 51687 Reims cedex 2 (France); Dormieux, L. [LMSGC, Ponts ParisTech, cite Descartes, Champs-sur-Marne, F-77455 (France); Liu, W. K. [Northwestern University, DME, Evanston (United States) and SKKU (Korea, Republic of)

2010-06-15T23:59:59.000Z

326

Critical radius for sustained propagation of spark-ignited spherical flames  

Science Conference Proceedings (OSTI)

An experimental study was performed to determine the requirements for sustained propagation of spark-ignited hydrogen-air and butane-air flames at atmospheric and elevated pressures. Results show that sustained propagation is always possible for mixtures whose Lewis number is less than unity, as long as a flame can be initially established. However, for mixtures whose Lewis number is greater than unity, sustained propagation depends on whether the initially ignited flame can attain a minimum radius. This minimum radius was determined for mixtures of different equivalence ratios and pressures, and was found to agree moderately well with the theoretically predicted critical radius beyond which there is no solution for the adiabatic, quasi-steady propagation of the spherical flame. The essential roles of pressure, detailed chemistry, and the need to use local values in the quantitative evaluation of the flame response parameters are emphasized. (author)

Kelley, Andrew P.; Jomaas, Grunde; Law, Chung K. [Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544 (United States)

2009-05-15T23:59:59.000Z

327

All the four dimensional static, spherically symmetric solutions of abelian Kaluza-Klein theory  

E-Print Network (OSTI)

The explicit form for all the four dimensional, static, spherically symmetric solutions in (4+n)-d Abelian Kaluza-Klein (KK) theory is presented by performing two SO(1,1) boosts on the non-extreme U(1)_M \\times U(1)_E KK black hole (BH) and supplementing it by SO(n)/SO(n-2) transformations. The solutions are parameterized by the mass M, Taub-Nut charge a, n electric \\vec{\\cal Q} and n magnetic \\vec{\\cal P} charges. Non-extreme BH's (with zero Taub-NUT charge) have either the Reissner-Nordstr\\" om or Schwarzschild global space-time, nonzero entropy and temperature. Extreme (supersymmetric) BH's satisfy \\vec{\\cal P} \\cdot \\vec{\\cal Q} = 0 and have a null or naked singularity, with S [T_H] reaching the zero lower [finite or infinite upper] bound.

Cvetic, M; Cveti, Mirjam; Youm, Donam

1995-01-01T23:59:59.000Z

328

Method of simulating spherical voids for use as a radiographic standard  

DOE Patents (OSTI)

A method of simulating small spherical voids in metal is provided. The method entails drilling or etching a hemispherical depression of the desired diameter in each of two sections of metal, the sections being flat plates or different diameter cylinders. A carbon bead is placed in one of the hemispherical voids and is used as a guide to align the second hemispherical void with that in the other plate. The plates are then bonded together with epoxy, tape or similar material and the two aligned hemispheres form a sphere within the material; thus a void of a known size has been created. This type of void can be used to simulate a pore in the development of radiographic techniques of actual voids (porosity) in welds and serve as a radiographic standard.

Foster, Billy E. (Oak Ridge, TN)

1977-01-01T23:59:59.000Z

329

PT-Rotations, PT-Spherical Harmonics and the PT-Hydrogen Atom  

E-Print Network (OSTI)

We have constructed a set of non-Hermitian operators that satisfy the commutation relations of the SO(3)-Lie algebra. It is shown that this operators generate rotations in the configuration space and not in the momentum space but in a modified non-Hermitian momentum space. This generators are related with a new type of spherical harmonics that result to be PT-orthonormal. Additionally, we have shown that this operators represent conserved quantities for a non-Hermitian Hamiltonian with an additional complex term. As a particular case, the solutions of the corresponding PT-Hydrogen atom that includes a complex term are obtained, and it is found that a non-Hermitian Runge-Lenz vector is a conserved quantity. In this way, we obtain a set of non-Hermitian operators that satisfy the SO(4)-Lie algebra.

Juan M. Romero; R. Bernal-Jaquez; O. Gonzalez-Gaxiola

2010-01-11T23:59:59.000Z

330

Range conditions for a spherical mean transform and global extension of solutions of Darboux equation  

E-Print Network (OSTI)

The transform under study is defined by integration of functions over spheres centered on a sphere. Such transform is of interest due to its applications in analysis and (thermoacoustic) tomography. The range of this transform has been described recently. Besides natural smoothness and support conditions, two type of conditions were involved: orthogonality condition and, in even dimension, moment condition. However, the moment condition was later derived from the other ones, which implies that orthogonality condition completely characterizes the range. We present a direct proof of this fact by proving existence of global extension for solutions of a certain boundary value problem for Darboux equation, associated with the spherical means. This extendibility phenomenon seems to be of independent interest.

Mark Agranovsky; Linh V. Nguyen

2009-04-27T23:59:59.000Z

331

Technologies - Lawrence Livermore National Laboratory  

Nuclear & Radiological. ... Operated by Lawrence Livermore National Security, LLC, for the Department of Energy's National Nuclear Security Administration

332

RFI Comments - Idaho National Laboratory  

Science Conference Proceedings (OSTI)

... These vulnerabilities are analyzed the common vulnerability reports produced the by National SCADA Test Bed at the Idaho National Laboratory ...

2013-04-12T23:59:59.000Z

333

Bioinformatics Systems | National Security | ORNL  

NLE Websites -- All DOE Office Websites (Extended Search)

Initiatives Cyber Security Nuclear Forensics Bioinformatics Videos Workshops National Security Home | Science & Discovery | National Security | Initiatives | Bioinformatics SHARE...

334

Program Areas | National Security | ORNL  

NLE Websites -- All DOE Office Websites (Extended Search)

Programs Initiatives Facilities Events and Conferences Supporting Organizations National Security Home | Science & Discovery | National Security | Program Areas SHARE Program...

335

Supporting Organizations | National Security | ORNL  

NLE Websites -- All DOE Office Websites (Extended Search)

Initiatives Facilities Events and Conferences Supporting Organizations National Security Home | Science & Discovery | National Security | Supporting Organizations SHARE Supporting...

336

National Nuclear Security Administration  

NLE Websites -- All DOE Office Websites (Extended Search)

i. i. Message from the Administrator President Obama has reshaped our national security priorities making enterprise infrastructure modernization with integrated Information Technology (IT) capabilities a key strategic initiative. Our IT infrastructure must ensure that our workforce can access appropriate information in a secure, reliable, and cost-effective manner. Effective information sharing throughout the government enhances the national security of the United States (US). For the National Nuclear Security Administration (NNSA), effective information sharing helps strengthen our nuclear security mission; builds collaborative networks within NNSA as well as with the Department of Energy (DOE), Department of Defense (DoD), and other national security

337

Level: National Data;  

U.S. Energy Information Administration (EIA) Indexed Site

.5 First Use of Energy for All Purposes (Fuel and Nonfuel), 2006; Level: National Data; Row: Energy Sources and Shipments, including Further Classification of 'Other' Energy...

338

2012 National Electricity Forum  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

National Electric Transmission Congestion Study Workshop - December 15, 2011 Sheraton San Diego Hotel & Marina, 1380 Harbor Island Drive, San Diego, California 92101 Agenda 8:00 am...

339

National Nanotechnology Initiative  

Office of Science (SC) Website

National National Nanotechnology Initiative (NNI) Basic Energy Sciences (BES) BES Home About Research Materials Sciences & Engineering (MSE) Chemical Sciences, Geosciences, and Biosciences (CSGB) Accelerator and Detector Research Research Conduct Policies DOE Energy Innovation Hubs Energy Frontier Research Centers National Nanotechnology Initiative (NNI) Nanomaterials ES&H Facilities Science Highlights Benefits of BES Funding Opportunities Basic Energy Sciences Advisory Committee (BESAC) News & Resources Contact Information Basic Energy Sciences U.S. Department of Energy SC-22/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3081 F: (301) 903-6594 E: sc.bes@science.doe.gov More Information » Research National Nanotechnology Initiative (NNI)

340

A National Resource  

NLE Websites -- All DOE Office Websites (Extended Search)

National Resource National Resource for Industry Manufacturing DeMonstration facility As the nation's premier research laboratory, Oak Ridge National Laboratory is one of the world's most capable resources for transforming the next generation of scientific discovery into solutions for rebuilding and revitalizing America's manufacturing industries. These industries call upon ORNL's expertise in materials synthesis, characterization, and process technology to reduce risk and accelerate the development and deployment of innovative energy-efficient manufacturing processes and materials targeting products of the future. The Department of Energy's first Manufacturing Demonstration Facility (MDF), established at ORNL, helps industry adopt new manufacturing technologies to reduce life-cycle energy and

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341

Quantifying National Energy Savings  

NLE Websites -- All DOE Office Websites (Extended Search)

Quantifying National Energy Savings Potential of Lighting Controls in Commercial Buildings Alison Williams, Barbara Atkinson, Karina Garbesi and Francis Rubinstein Energy Analysis...

342

Brookhaven National Laboratory  

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checking the document effective date on the PS Training website. Brookhaven National Laboratory Photon Sciences Directorate Subject: Photon Sciences TECH PROC LN2 Manual Fill...

343

Brookhaven National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

reminder to persons whose area will be inspected (i.e. Cognizant Space Managers) Brookhaven National Laboratory Photon Sciences Directorate Subject: ENVIRONMENTAL, SAFETY AND...

344

Brookhaven National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

current version by checking the document effective date on the PS Training website. Brookhaven National Laboratory Photon Sciences Directorate Subject: Photon Sciences ELEC PPE -...

345

National Hydrogen Learning Demonstration  

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Project Wrap-up National Renewable Energy Laboratory 3 Innovation for Our Energy Future Fuel Cell Electric Vehicle Learning Demo Project Objectives, Relevance, and Targets *...

346

Pacific Northwest National Laboratory  

NLE Websites -- All DOE Office Websites

Pacific Northwest National Laboratory Skip to Main Content U.S. Department of Energy Search PNNL Search PNNL Home About Research Publications Jobs News Contacts Featured Research...

347

NATIONAL ENERGY TECHNOLOGY LABORATORY  

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NATIONAL ENERGY TECHNOLOGY LABORATORY In 2011, the Office of Fossil Energy evaluated the realized and estimated benefits provided by its programs. Implemented by NETL, these...

348

News | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

News Argo exascale architecture Click on image to enlarge. Designing a new operating system for exascale architectures Full Story Argonne National Laboratory has been awarded a...

349

BROOKHAVEN NATIONAL LABORATORY - Energy  

Laboratory Plan FY 2010-2019 June2,2010 BROOKHAVEN NATIONAL LABORATORY Accelerating Innovation Alane for Hydrogen Storage and Delivery June 2012

350

Lawrence Livermore National Laboratory  

LLNL Home. Latest News Headlines. LLNL, Intel, Cray produce big data machine. November 4, 2013. ... Operated by Lawrence Livermore National Security, LLC, ...

351

" Level: National Data;" " ...  

U.S. Energy Information Administration (EIA) Indexed Site

3 Number of Establishments with Capability to Switch Natural Gas to Alternative Energy Sources, 2002;" " Level: National Data;" " Row: NAICS Codes;" " Column: Energy Sources;" "...

352

" Level: National Data;" " ...  

U.S. Energy Information Administration (EIA) Indexed Site

7 Number of Establishments with Capability to Switch Electricity to Alternative Energy Sources, 2002; " " Level: National Data;" " Row: NAICS Codes;" " Column: Energy Sources;" "...

353

Sandia National Laboratories - Reports  

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Reports Sandia National Laboratories Review Reports 2013 Review of the Sandia Site Office Quality Assurance Assessment of the Manzano Nuclear Operations, January 2013 Activity...

354

Los Alamos National Laboratory  

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2013 - Hours after a disaster declaration by Los Alamos County, Los Alamos National Laboratory officials on Friday described "millions" of dollars in damage to environmental...

355

Los Alamos National Laboratory  

National Nuclear Security Administration (NNSA)

support for national defense and homeland security programs; and U.S. Department of Energy (DOE) waste management activities. The Plutonium Facility at Technical Area 55...

356

Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Jurisdiction ANSI. American National Standards Institute ASTM. American Society for Testing and Materials BOE. Bureau of Explosives I-29 CIS. Chemical Inventory System CPIA....

357

Nevada National Security Site  

NLE Websites -- All DOE Office Websites (Extended Search)

of nuclear weapons and storing special nuclear materials. Other activities include environmental management, national security response, and defense and civil technologies....

358

2012 National Electricity Forum  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2011 National Electric Transmission Congestion Study Workshop - December 6, 2011 Hilton Philadelphia Airport, 4509 Island Avenue, Philadelphia, PA 19153 Hilton Philadelphia...

359

ARGONNE NATIONAL LABORATORY  

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National Laboratory wild@mcs.anl.gov ABSTRACT Code optimization in the high-performance computing realm has traditionally focused on reducing execution time. The problem, in...

360

Oak Ridge National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Oak Ridge National Laboratory Search Go Find People Contact Site Index Comments Home News News Releases Story Tips Features Contacts ORNL Review Magazine ORNL in the News...

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they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


361

2012 National Electricity Forum  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

1 U.S. Department of Energy 2012 National Electric Transmission Congestion Study Western Regional Workshops December 13, 2011 - Portland, Oregon Sheraton Portland Airport Hotel...

362

Procurement | Argonne National Laboratory  

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Video "Doing business with Argonne and Fermi national labs" - Aug. 21, 2013 Procurement Argonne spends approximately 300,000,000 annually through procurements to a diverse group...

363

Non-minimal $R^\\beta F^2$-Coupled Electromagnetic Fields to Gravity and Static, Spherically Symmetric Solutions  

E-Print Network (OSTI)

We investigate non-minimal $R^\\beta F^2$-type couplings of electromagnetic fields to gravity. We derive the field equations by a first order variational principle using the method of Lagrange multipliers. Then we present various static, spherically symmetric solutions describing the exterior fields in the vicinity of electrically charged massive bodies.

Dereli, Tekin

2011-01-01T23:59:59.000Z

364

Effects of radiation and compression on propagating spherical flames of methane/air mixtures near the lean flammability limit  

SciTech Connect

Large discrepancies between the laminar flame speeds and Markstein lengths measured in experiments and those predicted by simulations for ultra-lean methane/air mixtures bring a great concern for kinetic mechanism validation. In order to quantitatively explain these discrepancies, a computational study is performed for propagating spherical flames of lean methane/air mixtures in different spherical chambers using different radiation models. The emphasis is focused on the effects of radiation and compression. It is found that the spherical flame propagation speed is greatly reduced by the coupling between thermal effect (change of flame temperature or unburned gas temperature) and flow effect (inward flow of burned gas) induced by radiation and/or compression. As a result, for methane/air mixtures near the lean flammability limit, the radiation and compression cause large amounts of under-prediction of the laminar flame speeds and Markstein lengths extracted from propagating spherical flames. Since radiation and compression both exist in the experiments on ultra-lean methane/air mixtures reported in the literature, the measured laminar flame speeds and Markstein lengths are much lower than results from simulation and thus cannot be used for kinetic mechanism validation. (author)

Chen, Zheng [State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Aerospace Engineering, College of Engineering, Peking University, Beijing 100871 (China)

2010-12-15T23:59:59.000Z

365

A Multimoment Finite-Volume Shallow-Water Model on the Yin–Yang Overset Spherical Grid  

Science Conference Proceedings (OSTI)

A numerical model for shallow-water equations has been built and tested on the Yin–Yang overset spherical grid. A high-order multimoment finite-volume method is used for the spatial discretization in which two kinds of so-called moments of the ...

Xingliang Li; Dehui Chen; Xindong Peng; Keiko Takahashi; Feng Xiao

2008-08-01T23:59:59.000Z

366

An Upwind-Biased Conservative Transport Scheme for Multi-stage Temporal Integrations on Spherical Icosahedral Grids  

Science Conference Proceedings (OSTI)

A standard nominally third-order upwind-biased spatial discretization of the flux-divergence operator was extended to a spherical icosahedral grid. The method can be used with multi-stage time-stepping schemes such as the Runge-Kutta method to ...

Hiroaki Miura

367

Energy distribution of the Einstein-Klein-Gordon system for a static spherically symmetric spacetime in (2+1)-dimensions  

E-Print Network (OSTI)

We use Moeller's energy-momentum complex in order to explicitly compute the energy and momentum density distributions for an exact solution of Einstein's field equations with a negative cosmological constant minimally coupled to a static massless scalar field in a static, spherically symmetric background in (2+1)-dimensions.

I. Radinschi; Th. Grammenos

2005-08-01T23:59:59.000Z

368

NREL: Foreign Nationals  

NLE Websites -- All DOE Office Websites (Extended Search)

Foreign Nationals Foreign Nationals At the National Renewable Energy Laboratory (NREL), collaboration is key to conducting scientific research at our institution in Golden, Colorado. Because an international scope is essential to our development program, we invite outstanding scholars from other countries to become an integral part of our organization through the Foreign National Assignment Program. This program enables people with new ideas and talents from around the world to contribute to research of mutual interest at the Laboratory while also contributing to the transfer of the technology resulting from that research. As a foreign national, you'll need information about immigration and the various types of visas. You can also find numerous helpful links to the State Department, U.S. Citizenship and Immigration Services, the Social

369

MOTORWEEK YELLOWSTONE NATIONAL PARK  

NLE Websites -- All DOE Office Websites (Extended Search)

MOTORWEEK MOTORWEEK YELLOWSTONE NATIONAL PARK JOHN DAVIS: Some of America's most precious treasures are our national parks. And the U.S. park service understands that keeping the parks pristine, while also allowing easy access by vacationers is a huge challenge. So, setting the pace on making the drive through the parks greener is not just a goal, it's a passion. JOHN DAVIS: The National Parks Service is entrusted with preserving and showcasing America's natural wonders and historical landmarks, maintaining 392 national parks covering million acres of land and water in all parts of the country, and plays host to more than 275 million visitors every year. No other place on earth has as much natural diversity and spectacular scenery in one accessible place than America's first national park, Yellowstone, so it's no surprise this

370

Los Alamos National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

remembers former director Harold remembers former director Harold Agnew September 30, 2013 Manhattan Project pioneer was LANL director from 1970-1979 LOS ALAMOS, N.M., Sept. 30, 2013-Los Alamos National Laboratory Director Charlie McMillan today remembered Harold Agnew as a national treasure who transformed the Laboratory into what it is in the 21st century. "His contributions to the Laboratory made us the institution we are today," McMillan said. "It was his vision - decades ago - that recognized that national security science - 2 - brings value to a broad spectrum of breakthroughs. Los Alamos and the nation will be forever in Harold's debt." Agnew died at home on Sunday, Sept. 29, his family announced. He was the third director of Los Alamos National Laboratory, succeeding Robert

371

National Teacher Enhancement Project  

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funded by the National Science Foundation and the funded by the National Science Foundation and the U.S. Department of Energy Office of Science and offered at 10 DOE National Laboratories NTEP Projects Learning to Live in a Risky World Lewis and Clark in Washington The Seed Connection SIMply Prairie Home Energy Audit Weather Watchers Project Background . . . but where's the class? Doing Research - Publishing Results Created for the NTEP II Fermilab LInC program sponsored by Fermi National Accelerator Laboratory Education Office and Friends of Fermilab, and funded by United States Department of Energy, Illinois State Board of Education, North Central Regional Technology in Education Consortium which is operated by North Central Regional Educational Laboratory (NCREL), and the National Science Foundation. Web Maintainer: ed-webmaster@fnal.gov

372

National Security, Weapons Science  

NLE Websites -- All DOE Office Websites (Extended Search)

National Security, Weapons Science National Security, Weapons Science /science-innovation/_assets/images/icon-science.jpg National Security, Weapons Science National security depends on science and technology. The United States relies on Los Alamos National Laboratory for the best of both. No place on Earth pursues a broader array of world-class scientific endeavors. Dual-Axis Radiographic Hydrodynamic Test Facility (DARHT) The Dual-Axis Radiographic Hydrodynamic Test Facility at LANL is part of the DOE's stockpile stewardship program. It uses two large X-ray machines to record three-dimensional interior images of materials. In most experiments, materials (including plutonium) undergo hydrodynamic shock to simulate the implosion process in nuclear bombs and/or the effects of severe hydrodynamic stress. The tests are described as "full-scale mockups

373

A new uniform parameterization and invariant 3D spherical harmonic shape descriptors for shape analysis of the heart's left ventricle - A pilot study  

Science Conference Proceedings (OSTI)

A new approach for uniform parameterization and rotation invariant global description of 3D triangular surface meshes of objects with a spherical topology is presented. It consists of two steps. First, an initial mapping based on a heat conduction model ... Keywords: Left ventricle, Myocardial scintigraphy, Rotation invariant 3D shape descriptors, Spherical harmonic model, Uniform parameterization

A. Ben Abdallah; F. Ghorbel; K. Chatti; H. Essabbah; M. H. Bedoui

2010-10-01T23:59:59.000Z

374

Sandia National Laboratories: Sandia National Laboratories: Missions:  

NLE Websites -- All DOE Office Websites (Extended Search)

Accomplishments Accomplishments About Defense Systems & Assessments Program Areas Accomplishments Archives Cybersecurity Missions Accomplishments Protecting the nation Sandia lasers test and calibrate sensors on U.S. satellites Sandia's scientists and engineers have a significant impact on national security and continually deliver results, including these noteworthy successes from fiscal year 2012: AHW Launch Advanced Hypersonic Weapon test flight Sandia conducted a highly successful first test flight of the Advanced Hypersonic Weapon (AHW) concept for the U.S. Army Space and Missile Defense Command. Designed to fly within the earth's atmosphere at hypersonic speed and long range, the first-of-its-kind glide vehicle launched from Sandia's Kauai Test Facility in Kauai, Hawaii, using a three-stage

375

NATIONAL INSTITUTES OF HEALTH | National Cancer Institute LABORATORY OF PATHOLOGY  

E-Print Network (OSTI)

NATIONAL INSTITUTES OF HEALTH | National Cancer Institute LABORATORY OF PATHOLOGY National Cancer Institute (NCI) The Laboratory of Pathology, based in the NCI, provides clinical service in anatomic-scientists DEPARTMENT OF HEALTH AND HUMAN SERVICES National Institutes of Health National Cancer Institute, Center

376

National Security Science  

NLE Websites -- All DOE Office Websites (Extended Search)

NSS cover - april NSS cover - april Read the April 2013 issue: web | interactive| pdf Skip to Content Skip to Search Skip to Utility Navigation Skip to Top Navigation Skip to Content Navigation Los Alamos National Laboratory submit About | Mission | Business | Newsroom | Phonebook Los Alamos National Laboratory links to site home page Science & Innovation Collaboration Careers, Jobs Community, Environment Science & Innovation Home » Science & Engineering Capabilities Accelerators, Electrodynamics Bioscience, Biosecurity, Health Chemical Science Earth, Space Sciences Energy Engineering High Energy Density Plasmas, Fluids Information Science, Computing, Applied Math Materials Science National Security, Weapons Science Nuclear & Particle Physics, Astrophysics, Cosmology

377

National Clean Fuels Inc National Wind Solutions Inc | Open Energy  

Open Energy Info (EERE)

Clean Fuels Inc National Wind Solutions Inc Clean Fuels Inc National Wind Solutions Inc Jump to: navigation, search Name National Clean Fuels Inc (National Wind Solutions Inc) Place San Antonio, Texas Zip 78230 Product Texas-based consultancy that works with clean technology developers, or with public utilities in their strategic and procurement plans for alternative energy contracts. References National Clean Fuels Inc (National Wind Solutions Inc)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. National Clean Fuels Inc (National Wind Solutions Inc) is a company located in San Antonio, Texas . References ↑ "National Clean Fuels Inc (National Wind Solutions Inc)" Retrieved from "http://en.openei.org/w/index.php?title=National_Clean_Fuels_Inc_National_Wind_Solutions_Inc&oldid=349061"

378

Savannah River National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Savannah River National Laboratory Savannah River National Laboratory srnl.doe.gov SRNL is a DOE National Laboratory operated by Savannah River Nuclear Solutions. At a glance Additive Manufacturing (3D Printing): Selectively Printed Conductive Pathways Researchers at the Savannah River National Laboratory (SRNL) have developed a rapid prototype conductive material that can be used for electrical shielding or circuit fabrication. Background Several rapid prototype technologies currently exist. A few of the technologies produce metallic parts, but the majority produce nonconductive parts made from various grades of plastic. In all of these technologies however, only conductive material or nonconductive material can be used within one part created. There is no known option for 3D printing conductive material for

379

National Transportation Stakeholders Forum  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

N N ti l T t ti National Transportation Stakeholders Forum Chicago, IL, May 26, 2010 Ahmad Al-Daouk Date and page number - 1 Director, National Security Department National Nuclear Security Administration Service Center - Albuquerque, NM National Transportation Stakeholders Forum OSRP * NNSA Contractors transporting in commerce, are required law to comply with applicable regulations required law to comply with applicable regulations (e.g. federal, local, tribal) * Great majority of NNSA shipments are non-secured * Off-Site Source Recovery Program (OSRP) - OSRP is a U.S. Government activity sponsored and overseen by NNSA Office of Global Threat Reduction and the program is managed by LANL Mi i i t t d b d d Date and page number - 2 - Mission is to remove excess, unwanted, abandoned, or

380

IDAHO NATIONAL LABORATORY  

NLE Websites -- All DOE Office Websites (Extended Search)

History of the Idaho National Laboratory (INL) History of the Idaho National Laboratory (INL) You are here: DOE-ID Home > Inside ID > Brief History Site History The Idaho National Laboratory (INL), an 890-square-mile section of desert in southeast Idaho, was established in 1949 as the National Reactor Testing Station. Initially, the missions at the INL were the development of civilian and defense nuclear reactor technologies and management of spent nuclear fuel. Fifty-two reactors—most of them first-of-a-kind—were built, including the Navy’s first prototype nuclear propulsion plant. Of the 52 reactors, three remain in operation at the site. In 1951, the INL achieved one of the most significant scientific accomplishments of the century—the first use of nuclear fission to produce a usable quantity of electricity at the Experimental Breeder Reactor No.

Note: This page contains sample records for the topic "national spherical torus" 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

AMERICA'S NATIONAL LABS  

NLE Websites -- All DOE Office Websites (Extended Search)

AMERICA'S AMERICA'S NATIONAL LABS by 50 50 M A D E IN U S A B r e a k t h r o u g h s America's National Laboratory system has been changing and improving the lives of millions for more than 80 years. Born at a time of great societal need, this network of Department of Energy Laboratories has now grown into 17 facilities, working together as engines of prosperity and invention. As this list of 50 Break- throughs attests, National Laboratory discoveries have spawned industries, saved lives, generated new products, fired the imagination, and helped to reveal the secrets of the universe. Rooted in the need to be the best and bring the best, America's National Laboratories have put an American stamp on the past century of science. With equal ingenuity and tenacity, they are now engaged in

382

national | OpenEI  

Open Energy Info (EERE)

national national Dataset Summary Description Gate to gate life cycle inventory (LCI) data for the US national grid. Includes generation and transmission of electricity for US electricity grid. Representative of year 2008 mix of fuels used for utility electricity generation in US. Fuels include biomass, coal, petroleum, geothermal, natural gas, nuclear, solar, hydroelectric and wind energy sources.This data was developed by:- Alberta Carpenter, NREL- Chris Goemans, Athena Institute Source NREL Date Released Unknown Date Updated Unknown Keywords 2008 Electricity LCI national US Data application/vnd.ms-excel icon SS_Electricity_at_Grid_US_2008.xls (xls, 176.6 KiB) Quality Metrics Level of Review Some Review Comment Temporal and Spatial Coverage Frequency Time Period 2008

383

National Synchrotron Light Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Environmental Assessment Environmental Assessment Proposed Upgrade and Improvement of the National Synchrotron Light Source Complex at Brookhaven National Laboratory, Upton, New York This Environmental Assessment addresses the proposed action by the U.S. Department of Energy to upgrade the facilities of the National Synchrotron Light Source Complex, namely the National Synchrotron Light Source (NSLS), the Accelerator Test Facility and the Source Development Laboratory. The environmental effects of a No-Action Alternative as well as a Proposed Action are evaluated in the Environmental Assessment. The “NSLS Environmental Assessment Fact Sheet” link below leads to a one-page summary of the Environmental Assessment. The “NSLS Environmental Assessment” link below leads to the whole 41-page

384

National Climate Assessment: Overview  

NLE Websites -- All DOE Office Websites (Extended Search)

Production Team Production Team Indicators System Coastal Resilience Resources Make Our Science Accessible Link Climate Change & Health Provide Data and Tools Coordinate Internationally National Climate Assessment: Overview Print E-mail What is the National Climate Assessment (NCA)? The NCA is an important resource for understanding and communicating climate change science and impacts in the United States. It informs the nation about already observed changes, the current status of the climate, and anticipated trends for the future. The NCA report process integrates scientific information from multiple sources and sectors to highlight key findings and significant gaps in our knowledge. The NCA also establishes consistent methods for evaluating climate impacts in the U.S. in the context of broader global change. Finally, findings from the NCA provide input to Federal science priorities and are used by U.S. citizens, communities, and businesses as they create more sustainable and environmentally sound plans for the nation's future.

385

Brookhaven National Laboratory, Office  

NLE Websites -- All DOE Office Websites (Extended Search)

of 2006 the Office of Educational Programs (OEP) at the U.S. Department of Energy's Brookhaven National Laboratory launched the Open Space Stewardship Program as part of its Green...

386

Diesel prices increase nationally  

U.S. Energy Information Administration (EIA) Indexed Site

Diesel prices increase nationally The U.S. average retail price for on-highway diesel fuel rose to 3.91 a gallon on Monday. That's up 1.3 cents from a week ago, based on the...

387

Diesel prices flat nationally  

U.S. Energy Information Administration (EIA) Indexed Site

Diesel prices flat nationally The U.S. average retail price for on-highway diesel fuel remained the same from a week ago at 3.98 a gallon on Monday, based on the weekly price...

388

National Environmental Policy Act  

NLE Websites -- All DOE Office Websites (Extended Search)

National Laboratory (ORNL) CX-ORR-13-007 SC 9172013 Timber Salvage from Pine Ridge Storm Damage CX-ORR-13-008 SC 9252013 Office of Secure Transportation Multiple Actions...

389

Los Alamos National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

to 150 million over five years LOS ALAMOS, N.M., May 14, 2013-Los Alamos National Laboratory has awarded a master task order agreement in which three small businesses will...

390

Los Alamos National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

to 400 million over five years LOS ALAMOS, N.M., Sept. 23, 2013-Los Alamos National Laboratory has awarded master task order agreements to three small businesses for environmental...

391

Students | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Apply for a Job Connect with Argonne LinkedIn Facebook Twitter YouTube Google+ More Social Media Students Interested in exploring what it would be like to work at a national...

392

Washington National Records Center  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Washington National Records Center Washington D.C. 20404 Annette Black, IM-23, 301-903-3842 Annette.Black@hq.doe.gov John E. Davenport, Director Records Management Div. IM23270CC...

393

National Renewable Energy Laboratory  

E-Print Network (OSTI)

Wh kilowatt-hour LED light emitting diode MECO Maui Electric Company MWh megawatt-hour NAECA National-generation technologies, such as seawater air-conditioning (SWAC) and Light-emitting diodes (LEDs), as an addendum

394

Alamos National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Economic development in Northern New Mexico focus of new podcast from Los Alamos National Laboratory November 25, 2013 Podcast part of Lab's new multi-channel effort to better...

395

Simulation of current-filament dynamics and relaxation in the Pegasus Spherical Tokamak  

Science Conference Proceedings (OSTI)

Nonlinear numerical computation is used to investigate the relaxation of non-axisymmetric current-channels from washer-gun plasma sources into 'tokamak-like' plasmas in the Pegasus toroidal experiment [Eidietis et al. J. Fusion Energy 26, 43 (2007)]. Resistive MHD simulations with the NIMROD code [Sovinec et al. Phys. Plasmas 10(5), 1727-1732 (2003)] utilize ohmic heating, temperature-dependent resistivity, and anisotropic, temperature-dependent thermal conduction corrected for regions of low magnetization to reproduce critical transport effects. Adjacent passes of the simulated current-channel attract and generate strong reversed current sheets that suggest magnetic reconnection. With sufficient injected current, adjacent passes merge periodically, releasing axisymmetric current rings from the driven channel. The current rings have not been previously observed in helicity injection for spherical tokamaks, and as such, provide a new phenomenological understanding for filament relaxation in Pegasus. After large-scale poloidal-field reversal, a hollow current profile and significant poloidal flux amplification accumulate over many reconnection cycles.

O'Bryan, J. B.; Sovinec, C. R.; Bird, T. M. [Department of Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)

2012-08-15T23:59:59.000Z

396

Variable order spherical harmonic expansion scheme for the radiative transport equation using finite elements  

SciTech Connect

Highlights: {yields} We developed a variable order global basis scheme to solve light transport in 3D. {yields} Based on finite elements, the method can be applied to a wide class of geometries. {yields} It is computationally cheap when compared to the fixed order scheme. {yields} Comparisons with local basis method and other models demonstrate its accuracy. {yields} Addresses problems encountered n modeling of light transport in human brain. - Abstract: We propose the P{sub N} approximation based on a finite element framework for solving the radiative transport equation with optical tomography as the primary application area. The key idea is to employ a variable order spherical harmonic expansion for angular discretization based on the proximity to the source and the local scattering coefficient. The proposed scheme is shown to be computationally efficient compared to employing homogeneously high orders of expansion everywhere in the domain. In addition the numerical method is shown to accurately describe the void regions encountered in the forward modeling of real-life specimens such as infant brains. The accuracy of the method is demonstrated over three model problems where the P{sub N} approximation is compared against Monte Carlo simulations and other state-of-the-art methods.

Surya Mohan, P., E-mail: sprerapa@cs.ucl.ac.uk [Department of Computer Science, University College London, Gower Street, London WC1E 6BT (United Kingdom); Tarvainen, Tanja, E-mail: tanja.tarvainen@uef.fi [Department of Computer Science, University College London, Gower Street, London WC1E 6BT (United Kingdom); Department of Applied Physics, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio (Finland); Schweiger, Martin, E-mail: martins@medphys.ucl.ac.uk [Department of Computer Science, University College London, Gower Street, London WC1E 6BT (United Kingdom); Pulkkinen, Aki, E-mail: pulkkine@sten.sunnybrook.utoronto.ca [Department of Applied Physics, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio (Finland); Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, 2075 Bayview Ave., Toronto, M4N 3M5 (Canada); Arridge, Simon R., E-mail: S.Arridge@cs.ucl.ac.uk [Department of Computer Science, University College London, Gower Street, London WC1E 6BT (United Kingdom)

2011-08-10T23:59:59.000Z

397

Propagation of transient signals from a spherical source in a half-space with surface layers  

SciTech Connect

The title problem is of particular interest for the analysis of seismic signals arising from underground nuclear explosions. Previous attempts at the solution have indicated that, although cylindrical symmetry exists, conventional methods cannot be applied because of the existence of plane and spherical boundaries. The present paper develops a ray-grouping technique for finding the solution to the title problem. This technique allows the separation of the problem into a series of canonical problems. Each such problem deals with a given boundary condition (e.g., continuity conditions at a material interface). Using this technique, one may follow waves along ray paths. It is easy to identify, after n reflections, (a) rays which arrive simultaneously at a given point and (b) the terms in the solution which need to be included at a given time. It is important to note that a cylindrical coordinate system is not employed, even though the problem is axially symmetric. Instead, the equations are carefully transformed making it possible to use a Cartesian coordinate system. This results in a spectral representation of the solution in terms of algebraic expressions in lieu of Bessel functions.

Norwood, F.R.

1993-01-01T23:59:59.000Z

398

Propagation of transient signals from a spherical source in a half-space with surface layers  

Science Conference Proceedings (OSTI)

The title problem is of particular interest for the analysis of seismic signals arising from underground nuclear explosions. Previous attempts at the solution have indicated that, although cylindrical symmetry exists, conventional methods cannot be applied because of the existence of plane and spherical boundaries. The present paper develops a ray-grouping technique for finding the solution to the title problem. This technique allows the separation of the problem into a series of canonical problems. Each such problem deals with a given boundary condition (e.g., continuity conditions at a material interface). Using this technique, one may follow waves along ray paths. It is easy to identify, after n reflections, (a) rays which arrive simultaneously at a given point and (b) the terms in the solution which need to be included at a given time. It is important to note that a cylindrical coordinate system is not employed, even though the problem is axially symmetric. Instead, the equations are carefully transformed making it possible to use a Cartesian coordinate system. This results in a spectral representation of the solution in terms of algebraic expressions in lieu of Bessel functions.

Norwood, F.R.

1993-06-01T23:59:59.000Z

399

Biofabrication of discrete spherical gold nanoparticles using the metal-reducing bacterium, Shewanella oneidensis  

Science Conference Proceedings (OSTI)

Nanocrystallites have garnered substantial interest due to their varying applications including catalysis. Consequently important aspects related to control of shape/size and syntheses through economical and non-hazardous means are desirable. Highly efficient bioreduction based natural fabrication approaches that utilize microbes and or -plant extracts are poised to meet these needs. Here we show that the gamma- proteobacterium, Shewanella oneidensis MR-1, can reduce tetrachloro aurate (III) ions, producing discrete extracellular spherical gold nanocrystallites. The particles were homogeneous with multiple size distributions and produced under ambient conditions at high yield, 88% of theoretical maximum. Further characterization revealed that the particles consist of spheres in the size range of 2-50 nm, with an average of 12 5 nm. The nanoparticles were hydrophilic, biocompatible, and resisted aggregation even after several months. The particles are likely capped by a detachable protein/peptide coat. UV-vis and Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectra and transmission electron microscopy measurements confirmed the formation as well the crystalline nature of the nanoparticles. The antibacterial activity of these gold nanoparticles was assessed using Gram-negative (E. coli and S. oneidensis) and Gram-positive (B. subtilis) bacteria. Toxicity assessments divulged that the particles were neither toxic nor inhibitory to any of these bacteria.

Suresh, Anil K [ORNL; Pelletier, Dale A [ORNL; Wang, Wei [ORNL; Broich, Michael L [ORNL; Moon, Ji Won [ORNL; Gu, Baohua [ORNL; Allison, David P [ORNL; Joy, David Charles [ORNL; Phelps, Tommy Joe [ORNL; Doktycz, Mitchel John [ORNL

2011-01-01T23:59:59.000Z

400

Final State of Spherical Gravitational Collapse and Likely Source of Gamma Ray Bursts  

E-Print Network (OSTI)

Following our result that for the final state of continued spherical gravitational collapse, the gravitational mass of the fluid, $M_f\\to 0$, we show that for a physical fluid the eventual value of $2GM_f/R_f\\to 1$ rather than $2GM_f/R_f <1$, indicating approach to a zero-mass black hole. We also indicate that as the final state would be approached, the curvature components tend to blow up, and the proper radial distance $l$ and the proper time $\\tau \\to \\infty$. This indicates that actually the singularity is never attained for the collapse of an isolated body. We also identify that, the final state may correspond to the local 3-speed $v\\to c$, eventhough the circumference speed $U\\to 0$. However, at a finite observation epoch, such Eternally Collapsing Objects (ECOs) may have a modest local speed of collapse $v \\ll c$, and the lab frame speed of collapse should practically be zero because of their extremely high surface gravitational red-shifts.

Abhas Mitra

1998-03-03T23:59:59.000Z

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401

Towards the Final State of Spherical Gravitational Collapse and Likely Source of Gamma Ray Bursts  

E-Print Network (OSTI)

We invoke the global properties of the actual GTR field equations for spherical collapse to directly show that the condition for formation of trapped surfaces, 2GM/R >1 is not allowed by GTR. And therefore all singularity theorems based on the assumption of formation of trapped surfaces are invalidated! Our conclusion is in perfect agreement with Einstein's intuitive idea that a Sch. like surface can not occur in reality. Further as singularity is approached R ->0, in order that 2GM/R 0! Harrison, et al. had also pointed out that collapse should come to a decisive end with M=0. This is possible in GTR if the fluid radiates its entire original mass-energy during the relentless graviatational contraction process, Q->M c^2! Since the actual efficiency for gamma ray production by the relevant blast wave may hardly exceed 10-20% and there could be a stronger (undetected) nu-anti-nu burst precding GRBs, the actual energy released for GRB 990123, even accounting for probable weak beaming, or for GRB 971214 (unbeamed) could be ~10^{54-55} erg. And such energy release may not be properly accountable without realizing that trapped surfaces are indeed not formed. All authors concerned with this subject, and particularly those, who would like to differ with our derivation are requested to send their criticism either directly or express the same openly for a healthy scientific discussion.

Abhas Mitra

1998-03-03T23:59:59.000Z

402

Toroidal ripple transport of beam ions in the mega-ampere spherical tokamak  

Science Conference Proceedings (OSTI)

The transport of injected beam ions due to toroidal magnetic field ripple in the mega-ampere spherical tokamak (MAST) is quantified using a full orbit particle tracking code, with collisional slowing-down and pitch-angle scattering by electrons and bulk ions taken into account. It is shown that the level of ripple losses is generally rather low, although it depends sensitively on the major radius of the outer midplane plasma edge; for typical values of this parameter in MAST plasmas, the reduction in beam heating power due specifically to ripple transport is less than 1%, and the ripple contribution to beam ion diffusivity is of the order of 0.1 m{sup 2} s{sup -1} or less. It is concluded that ripple effects make only a small contribution to anomalous transport rates that have been invoked to account for measured neutron rates and plasma stored energies in some MAST discharges. Delayed (non-prompt) losses are shown to occur close to the outer midplane, suggesting that banana-drift diffusion is the most likely cause of the ripple-induced losses.

McClements, K. G. [EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB (United Kingdom); Hole, M. J. [Plasma Research Laboratory, Research School of Physical Science and Engineering, Australian National University, Canberra, ACT 0200 (Australia)

2012-07-15T23:59:59.000Z

403

Optimal choices of reference for a quasilocal energy: Spherically symmetric spacetimes  

SciTech Connect

For a given timelike displacement vector, the covariant Hamiltonian quasilocal energy expression requires a proper choice of reference spacetime. We propose a program for determining the reference by embedding a neighborhood of the two-sphere boundary in the dynamic spacetime into a Minkowski reference, so that the two-sphere is embedded isometrically, and then extremizing the energy to determine the embedding variables. Applying this idea to Schwarzschild spacetime, we found that for each given future timelike displacement vector our program gives a unique energy value. The static observer measures the maximal energy. Applied to the Friedmann-Lemaitre-Robertson-Walker spacetime, we find that the maximum energy value is non-negative; the associated displacement vector is the unit dual mean curvature vector; and the expansion of the two-sphere boundary matches that of its reference image. For these spherically symmetric cases the reference determined by our program is equivalent to isometrically matching the geometry at the two-sphere boundary and taking the displacement vector to be orthogonal to the spacelike constant coordinate time hypersurface, like the timelike Killing vector of the Minkowski reference.

Wu, Ming-Fan; Chen, Chiang-Mei; Liu, Jian-Liang [Department of Physics Center for Mathematics and Theoretical Physics, National Central University, Chungli 320, Taiwan (China); Nester, James M. [Department of Physics Center for Mathematics and Theoretical Physics, National Central University, Chungli 320, Taiwan (China); Graduate Institute of Astronomy, National Central University, Chungli 320, Taiwan (China)

2011-10-15T23:59:59.000Z

404

The jump-off velocity of an impulsively loaded spherical shell  

SciTech Connect

We consider a constant temperature spherical shell of isotropic, homogeneous, linearly elastic material with density {rho} and Lame coefficients {lambda} and {mu}. The inner and outer radii of the shell are r{sub i} and r{sub o}, respectively. We assume that the inside of the shell is a void. On the outside of the shell, we apply a uniform, time-varying pressure p(t). We also assume that the shell is initially at rest. We want to compute the jump-off time and velocity of the pressure wave, which are the first time after t = 0 at which the pressure wave from the outer surface reaches the inner surface. This analysis computes the jump-off velocity and time for both compressible and incompressible materials. This differs substantially from [3], where only incompressible materials are considered. We will consider the behavior of an impulsively loaded, exponentially decaying pressure wave p(t) = P{sub 0{sup e}}{sup -{alpha}t}, where {alpha} {ge} 0. We notice that a constant pressure wave P(t) = P{sub 0} is a special case ({alpha} = 0) of a decaying pressure wave. Both of these boundary conditions are considered in [3].

Chabaud, Brandon M. [Los Alamos National Laboratory; Brock, Jerry S. [Los Alamos National Laboratory

2012-04-13T23:59:59.000Z

405

Microwave measurements of electron density in a spherical inertial- electrostatic confinement system using six ion guns  

SciTech Connect

The electron density in a spherical inertial-electrostatic confinement device using six ion beams was studied with microwave techniques involving the fundamental and higher order cavity resonances. Thermal expansion problems were circumvented by switched operation of the device. The deuterium background pressure was found to be a dominant factor in determining n/sub e/ throughout the entire range of 0.4 to 10 milliTorr. With 1 m Torr pressure and 10 mA total ion current (at 20 to 40 keV) central electron densities of the order of 10$sup 9$ electrons/ cm$sup 3$ were estimated, with total population of approximately 10$sup 10$ electrons. No evidence of shell structure of the electron density was found, although the use of higher order modes to obtain better spatial resolution was precluded by the low magnitude of n/sub e/. Indirect indication of weak ion trapping was obtained by measurement of the enhancement of neutron flux that resulted when the guns were operated simultaneously. (auth)

Chan, A.I.Y.

1975-08-01T23:59:59.000Z

406

Convergence, electrostatic potential, and density measurements in a spherically convergent ion focus  

SciTech Connect

Unique measurements of the basic plasma-flow characteristics in a low pressure ({le}53 mPa H{sub 2}) spherically convergent ion focus are obtained using high-voltage ({le}5 kV) emissive and double probes. The radial plasma potential distribution agrees with a collisionless, recirculating, space-charge-limited current model. Flow convergence increases with voltage and neutral pressure and decreases with cathode grid wire spacing and current. Core radii within 4{endash}5 times the ideal geometric limit are measured, and the observed core sizes are consistent with predictions from a multipass orbit model which includes asymmetries in the accelerating potential well. A virtual anode is observed in the converged core region, and no evidence for multiple potential well structures in the core is found. Measurements of the core ion density (n{sub ic}{approximately}10{sup 15} m{sup {minus}3}) are consistent with simple flow convergence models. {copyright} {ital 1997 American Institute of Physics.}

Thorson, T.A.; Durst, R.D.; Fonck, R.J.; Wainwright, L.P. [University of Wisconsin---Madison, 1500 Engineering Drive, Madison, Wisconsin 53706 (United States)] [University of Wisconsin---Madison, 1500 Engineering Drive, Madison, Wisconsin 53706 (United States)

1997-01-01T23:59:59.000Z

407

On the motion of the center of mass of a spherical turbulent premixed flame  

DOE Green Energy (OSTI)

The movement of the center of mass of a premixed statistically spherical flame in the wrinkled-laminar flame regime has been examined. When the flame is small (or comparable) to the integral scale of the turbulence, the flame ball is convected as a whole by the turbulent eddy. When the flame grows to a size large compared to the integral scale, the flame center of motion is not affected by the turbulence. This phenomenon has been explained in terms of the phase coherence of the local turbulent convection velocity at the flame front. When the flame is small, the turbulent velocity is coherent over the entire flame surface; as a result, the flame is convected as a whole by the turbulent eddy. When the flame is large, the velocity at the different area elements of the flame front is independent of each other. The center of mass velocity, which is an aggregate of the velocities at the different elements, therefore, tends to the mean velocity and is independent of the turbulence. A theory for predicting the variance of the flame center velocity has been developed. The prediction is in good agreement with the experimental results. 12 refs., 5 figs.

Cheng, W. K.; Hainsworth, E.

1988-01-01T23:59:59.000Z

408

Generation of extreme state of water by spherical wire array underwater electrical explosion  

SciTech Connect

The results of the first experiments on the underwater electrical explosion of a spherical wire array generating a converging strong shock wave are reported. Using a moderate pulse power generator with a stored energy of {<=}6 kJ and discharge current of {<=}500 kA with a rise-time of {approx}300 ns, explosions of Cu and Al wire arrays of different diameters and with a different number and diameter of wires were tested. Electrical, optical, and destruction diagnostics were used to determine the energy deposited into the array, the time-of-flight of the shock wave to the origin of the implosion, and the parameters of water at that location. The experimental and numerical simulation results indicate that the convergence of the shock wave leads to the formation of an extreme state of water in the vicinity of the implosion origin that is characterized by pressure, temperature, and compression factors of (2 {+-} 0.2) Multiplication-Sign 10{sup 12} Pa, 8 {+-} 0.5 eV, and 7 {+-} 0.5, respectively.

Antonov, O.; Gilburd, L.; Efimov, S.; Bazalitski, G.; Gurovich, V. Tz.; Krasik, Ya. E. [Physics Department, Technion, Haifa 3200 (Israel)

2012-10-15T23:59:59.000Z

409

A spherical Monte-Carlo model of aerosols: Validation and first applications to Mars and Titan  

E-Print Network (OSTI)

The atmospheres of Mars and Titan are loaded with aerosols that impact remote sensing observations of their surface. Here we present the algorithm and the first applications of a radiative transfer model in spherical geometry designed for planetary data analysis. We first describe a fast Monte-Carlo code that takes advantage of symmetries and geometric redundancies. We then apply this model to observations of the surface of Mars and Titan at the terminator as acquired by OMEGA/Mars Express and VIMS/Cassini. These observations are used to probe the vertical distribution of aerosols down to the surface. On Mars, we find the scale height of dust particles to vary between 6 km and 12 km depending on season. Temporal variations in the vertical size distribution of aerosols are also highlighted. On Titan, an aerosols scale height of 80 \\pm 10 km is inferred, and the total optical depth is found to decrease with wavelength as a power-law with an exponent of -2.0 \\pm 0.4 from a value of 2.3 \\pm 0.5 at 1.08 {\\mu}m. On...

Vincendon, Mathieu; 10.1016/j.icarus.2009.12.018

2011-01-01T23:59:59.000Z

410

ITER movie created by Oak Ridge National Laboratory, National...  

NLE Websites -- All DOE Office Websites (Extended Search)

ITER movie created by Oak Ridge National Laboratory, National Center for Computational Sciences American Fusion News Category: U.S. ITER Link: ITER movie created by Oak Ridge...

411

Secretary Chu visits Sandia National Labs | National Nuclear...  

NLE Websites -- All DOE Office Websites (Extended Search)

Mayor Richard Berry on a tour of Sandia National Laboratories' National Solar Thermal Test Facility, which is working to advance industry collaboration on clean energy...

412

Bruce Held visits Y-12 National Security Complex | National Nuclear...  

NLE Websites -- All DOE Office Websites (Extended Search)

Held visits Y-12 National Security Complex | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy...

413

LANL | TT | License | Software - Los Alamos National Lab: National ...  

Los Alamos National Laboratory • Est 1943 . Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA

414

LANL | TT | Awards - Los Alamos National Lab: National Security ...  

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA. Inside | © Copyright 2010-11 Los Alamos National Security, ...

415

LANL | Partnering | Agreements - Los Alamos National Lab: National ...  

Operated by Los Alamos National Security, LLC for the U.S. Department of Energy's NNSA. Inside | © Copyright 2010-11 Los Alamos National Security, ...

416

Secretary Chu visits Sandia National Labs | National Nuclear...  

National Nuclear Security Administration (NNSA)

and Albuquerque Mayor Richard Berry on a tour of Sandia National Laboratories' National Solar Thermal Test Facility, which is working to advance industry collaboration on clean...

417

FY 2011 National Security Technologies, LLC, PER Summary | National...  

National Nuclear Security Administration (NNSA)

National Security Technologies, LLC, PER Summary | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy...

418

Director at Sandia National Laboratories | National Nuclear Security...  

NLE Websites -- All DOE Office Websites (Extended Search)

at Sandia National Laboratories | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response...

419

National Security Technology Center | Y-12 National Security...  

NLE Websites -- All DOE Office Websites (Extended Search)

Global Security Security and Training National Security ... National Security Technology Center What kinds of security technologies are we talking about? See our capabilities...

420

Sandia National Laboratories: National Security Missions: International  

NLE Websites -- All DOE Office Websites (Extended Search)

WMD Counterterrorism & Response WMD Counterterrorism & Response Airworthiness Weapons of Mass Destruction (WMD) Counterterrorism & Response provides operational planning assistance and training to counter domestic and international nuclear and radiological terrorism, including: Specialized training for nuclear and explosive threats for warfighters and law enforcement Technologies for evaluating airframe integrity and other critical structural integrity Our partners include National Nuclear Security Administration (NNSA), Department of Defense (DoD), and Federal Aviation Administration (FAA). Program Areas include: Airworthiness and Infrastructure Assurance Nuclear Incident Response Nuclear Counterterrorism Chemical, Biological, Radiological, Nuclear and Explosives Technology Development

Note: This page contains sample records for the topic "national spherical torus" 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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421

THE NATIONAL BASIN DELINEATION PROJECT  

Science Conference Proceedings (OSTI)

The National Basin Delineation Project (NBDP) was undertaken by the National Severe Storms Laboratory to define flash-flood-scale basin boundaries for the country in support of the National Weather Service (NWS) Flash Flood Monitoring and ...

Ami T. Arthur; Gina M. Cox; Nathan R. Kuhnert; David L. Slayter; Kenneth W. Howard

2005-10-01T23:59:59.000Z

422

National Climate Assessment: Production Team  

NLE Websites -- All DOE Office Websites (Extended Search)

NCA & Development Advisory Committee NCA & Development Advisory Committee Production Team Indicators System Coastal Resilience Resources Make Our Science Accessible Link Climate Change & Health Provide Data and Tools Coordinate Internationally National Climate Assessment: Production Team Print E-mail National Climate Assessment Staff (USGCRP National Coordination Office) Current NCA Staff Dr. Fabien Laurier, Director, Third National Climate Assessment Dr. Glynis Lough, Chief of Staff for the National Climate Assessment Emily Therese Cloyd, Engagement Coordinator for the National Climate Assessment Bryce Golden-Chen, Program Coordinator for the National Climate Assessment Alison Delgado, Scientist Dr. Ilya Fischhoffkri, Scientist Melissa Kenney, Indicators Coordinator Dr. Fred Lipschultz, Regional Coordinator for the National Climate Assessment

423

Historical Photographs: Brookhaven National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Brookhaven National Laboratory 1. Positron emitter detector (circa 1962) used to detect brain tumors at Brookhaven National Laboratory (252Kbytes) 2. Medical activities at...

424

National Laboratories - EERE Commercialization Office  

National Laboratories. The U.S. Department of Energy's (DOE) national laboratories play an important role in the development and commercialization of ...

425

Clean Cities National Parks Initiative  

Energy.gov (U.S. Department of Energy (DOE))

Clean Cities partners with the National Park Service (NPS) through the Clean Cities National Parks Initiative to support transportation projects that educate park visitors on the benefits of...

426

Environmental Protection | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

electricity use, water consumption and environmental emissions. Environment and Sustainability Argonne National Laboratory is helping our nation build an economy based on...

427

Technologies - Lawrence Livermore National Laboratory  

LLNL Home. Latest News Headlines. ... Operated by Lawrence Livermore National Security, LLC, for the Department of Energy's National Nuclear Security Administration

428

Print - Lawrence Livermore National Laboratory  

... or in home healthcare settings. ... Operated by Lawrence Livermore National Security, LLC, for the Department of Energy's National Nuclear Security Administration

429

Berkeley Lab National User Facilities  

NLE Websites -- All DOE Office Websites (Extended Search)

(Energy Sciences Network) Joint Genome Institute The Molecular Foundry National Center for Electron Microscopy (NCEM) National Energy Research Scientific Computing Center (NERSC)...

430

Second National Climate Assessment (2009)  

NLE Websites -- All DOE Office Websites (Extended Search)

Print E-mail alt What is the Second National Climate Assessment? The Second National Climate Assessment, entitled Global Change Impacts in the United States, was published in...

431

Community Relations, Brookhaven National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Tour group Tour Program Meet the scientists who make the research at Brookhaven National Laboratory happen Brookhaven National Laboratory offers the unique opportunity for...

432

National Competition - EERE Commercialization Office  

2013 National Competition. On June 12, 2013, SiNode Systems from Northwestern University was announced as the winner of the second annual DOE National ...

433

National Laboratories - EERE Commercialization Office  

National Laboratories. The U.S. Department of Energy's (DOE) national laboratories play an important role in the development and commercialization of new energy ...

434

Print - Lawrence Livermore National Laboratory  

Improving security at U.S. seaports is one of the nation’s most difficult technical and practical challenges. Detection of contraband such as special ...

435

Vehicle Technologies Office: National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

National Laboratories Several of the U.S. Department of Energy (DOE) national laboratories host multidisciplinary transportation research centers. A wide-range of cutting-edge...

436

about Savannah River National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Tritium Effects on Materials In an effort to ensure the safety of the nation's nuclear weapons stockpile, the Savannah River National Laboratory (SRNL) maintains an active role in...

437

with Oak Ridge National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

2 Mechanisms for Partnering with Oak Ridge National Laboratory Partnerships-It's our name, but it also represents our driving philosophy and commitment. Oak Ridge National...

438

National Laboratories - Energy Innovation Portal  

Name Address City, State; Ames Laboratory: Ames Laboratory: Ames, IA: Argonne National Laboratory: 9700 S. Cass Avenue: Argonne, IL: Brookhaven National Laboratory

439

Lawrence Livermore National Laboratory (LLNL):  

NLE Websites -- All DOE Office Websites (Extended Search)

IPO Fact Sheet Strategic Diversity Program Lawrence Livermore National Laboratory (LLNL) works with other national laboratories to coordinate and integrate programmatic...

440

National Competition - EERE Commercialization Office  

2013 National Competition. On June 12, 2013, SiNode Systems from Northwestern University was announced as the winner of the second annual DOE National Clean Energy ...

Note: This page contains sample records for the topic "national spherical torus" from the National Library of EnergyBeta (NLEBeta).
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441

Gravitational collapse of a spherical star with heat flow as a possible energy mechanism of gamma-ray bursts  

E-Print Network (OSTI)

We investigate the gravitational collapse of a spherically symmetric, inhomogeneous star, which is described by a perfect fluid with heat flow and satisfies the equation of state $p=\\rho/3$ at its center. In the process of the gravitational collapsing, the energy of the whole star is emitted into space. And the remaining spacetime is a Minkowski one without a remnant at the end of the process. For a star with a solar mass and solar radius, the total energy emitted is at the order of $10^{54}$ {\\rm erg}, and the time-scale of the process is about $8s$. These are in the typical values for a gamma-ray burst. Thus, we suggest the gravitational collapse of a spherical star with heat flow as a possible energy mechanism of gamma-ray bursts.

Zhe Chang; Cheng-Bo Guan; Chao-Guang Huang; Xin Li

2008-03-26T23:59:59.000Z

442

Modified theory of secondary electron emission from spherical particles and its effect on dust charging in complex plasma  

SciTech Connect

The authors have modified Chow's theory of secondary electron emission (SEE) to take account of the fact that the path length of a primary electron in a spherical particle varies between zero to the diameter or x{sub m} the penetration depth depending on the distance of the path from the centre of the particle. Further by including this modified expression for SEE efficiency, the charging kinetics of spherical grains in a Maxwellian plasma has been developed; it is based on charge balance over dust particles and number balance of electrons and ionic species. It is seen that this effect is more pronounced for smaller particles and higher plasma temperatures. Desirable experimental work has also been discussed.

Misra, Shikha [Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi-110016 (India); Mishra, S. K. [Institute for Plasma Research, Gandhinagar-382428 (India); Sodha, M. S. [Department of Education Building, University of Lucknow, Lucknow-226007 (India)

2013-01-15T23:59:59.000Z

443

Spherical spin-orientation degeneracy of basic antiferromagnetic configurations due to the dipolar interaction in cubic lattices  

E-Print Network (OSTI)

Based on a simple general relation for the Lorentz field, the precise values are obtained for the energies of ferromagnetic and basic antiferromagnetic states in sc, bcc, fcc, and diamond cubic lattices. Within both the 'nearest-neighbor' and group-theoretic approaches, a large variety of antiferromagnetic states revealed as corresponding to the lowest energies is addressed, with recognizing their spherical spin-orientation degeneracy, which turns out to be rather special in fcc lattices.

Eugene V. Kholopov

2004-05-19T23:59:59.000Z

444

National Labs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

National Labs National Labs Special Feature: National Security & Public Safety at the National Labs This month on energy.gov, learn how the National Labs are advancing the national security and public safety interests of the United States. Read more Top 10 Things You Didn't Know About Los Alamos National Laboratory From national security science to supercomputing, Los Alamos National Lab is leading the way in protecting the American public, countering global threats and solving emerging energy challenges. Read more Energetic Science and Piranha-Proof Armor Learn how Berkeley Lab's Advanced Light Source is revealing the unique structure of incredible, adaptable fish armor. Read more Top 10 Things You Didn't Know About Lawrence Livermore National Laboratory From nuclear security to supercomputing, Lawrence Livermore National Lab is

445

National Labs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

National Labs National Labs Special Feature: National Security & Public Safety at the National Labs This month on energy.gov, learn how the National Labs are advancing the national security and public safety interests of the United States. Read more Top 10 Things You Didn't Know About Los Alamos National Laboratory From national security science to supercomputing, Los Alamos National Lab is leading the way in protecting the American public, countering global threats and solving emerging energy challenges. Read more Energetic Science and Piranha-Proof Armor Learn how Berkeley Lab's Advanced Light Source is revealing the unique structure of incredible, adaptable fish armor. Read more Top 10 Things You Didn't Know About Lawrence Livermore National Laboratory From nuclear security to supercomputing, Lawrence Livermore National Lab is

446

DOE Affirms National Interest Electric Transmission Corridor...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

DOE Affirms National Interest Electric Transmission Corridor Designations DOE Affirms National Interest Electric Transmission Corridor Designations DOE Affirms National Interest...

447

National Nuclear Security Administration Overview | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Nuclear Security Administration Overview National Nuclear Security Administration Overview National Nuclear Security Administration Overview More Documents & Publications National...

448

Spring 2013 National Transportation Stakeholders Forum Meeting...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

National Transportation Stakeholders Forum Spring 2013 National Transportation Stakeholders Forum Meeting, New York Spring 2013 National Transportation Stakeholders Forum...

449

Los Alamos National Lab: National Security Science  

NLE Websites -- All DOE Office Websites (Extended Search)

Content stc logo Content stc logo Best of Show Winner of STC's International Summit Awards Competition, 2013 Top Innovations of the Year Science and technology for a safe, secure nation Impenetrable encryption defends data from cyberterrorism keyboard with atrack button A hacker could crack a code, steal private information or shut down systems we rely on daily. Small enough to fit in a smart phone, our QkarD technology ("kee-u-kard") provides virtually impenetrable defense, using quantum cryptography to secure computers. This novel encryption generates security at the subatomic particle level. If someone tries to hack in, that particle is altered, and the owner quietly alerted. And it works-even against super-powerful quantum computers. Multipronged HIV vaccine shows promise in monkeys

450

Sandia National Laboratories: Sandia National Laboratories: Missions:  

NLE Websites -- All DOE Office Websites (Extended Search)

About Nuclear Weapons at Sandia About Nuclear Weapons at Sandia Weapons Researcher World-class scientists and engineers come to Sandia to conduct breakthrough research in nuclear weapons. Sandia designs more than 6,300 parts of a modern nuclear weapon's 6,500 components. Our state-of-the-art laboratories facilitate large-scale testing and computer simulation. Sandia's work is of the highest consequence and those doing the work face awesome responsibilities. Unlike other national labs, which focus on the physics package, Sandia's work is to weaponize the physics package. Sandia must ensure that the other 95% of the weapon's parts work perfectly at every point of contact with the delivery systems. This requires the broadest competencies in engineering, with a deep science foundation. At the core of Sandia's nuclear weapons program is warhead systems

451

Sandia National Laboratories: Sandia National Laboratories: Missions:  

NLE Websites -- All DOE Office Websites (Extended Search)

results. Our areas of accomplishment for results. Our areas of accomplishment for 2010 include: Nuclear Weapons Engineering People photo 90-day Feasibility Study: Sandia researchers conducted a 90-day feasibility study for the Office of the Secretary of Defense in a common arming, fuzing, and firing (AF&F) system for the W78/Mk12A and W88/Mk5 warheads, with excursions of the AF&F for high-surety warheads and the W87/Mk21 systems. The study found that significant levels of AF&F commonality are possible with existing system architectures that support use in the Mk5, Mk12A, and Mk21 re-entry systems and enable modernization goals for the future stockpile. People photo Arming & Fuzing Subsystem Inspection: On July 23, 2010, the 500th Arming & Fuzing Subsystem (AFS) was accepted by the National Nuclear

452

National Security Information Systems (NSIS) -National Security Systems &  

NLE Websites -- All DOE Office Websites (Extended Search)

NSSA: National Security Information Systems NSSA: National Security Information Systems Nonproliferation & National Security (NPNS) Overview Technical Nonproliferation Policy Support Strategic Trade Control Review of export license applications Multilateral Export Control Arrangements Interdiction Engagement & Training INECP INSEP GIPP Safeguards Concepts and Approaches Human Capital Development Additional Protocol Technical Assistance National Security Systems & Assessments National Security Information Systems Vulnerability Assessment Team (VAT) Radiation Detection & Response (RDR) Contact NPNS Other Major Programs Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE Division on Flickr Nonproliferation and National Security Program National Security Systems & Assessments

453

Director of the National Ignition Facility, Lawrence Livermore National  

NLE Websites -- All DOE Office Websites (Extended Search)

Director of the National Ignition Facility, Lawrence Livermore National Director of the National Ignition Facility, Lawrence Livermore National Laboratory | 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 > Who We Are > In The Spotlight > Edward Moses Director of the National Ignition Facility, Lawrence Livermore National Laboratory

454

Groundbreaking at National Ignition Facility | National Nuclear Security  

NLE Websites -- All DOE Office Websites (Extended Search)

Groundbreaking at National Ignition Facility | National Nuclear Security Groundbreaking at National Ignition Facility | 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 > Groundbreaking at National Ignition Facility Groundbreaking at National Ignition Facility May 29, 1997 Livermore, CA Groundbreaking at National Ignition Facility

455

SANDIA NATIONAL LABORATORIES  

NLE Websites -- All DOE Office Websites (Extended Search)

NATIONAL LABORATORIES NATIONAL LABORATORIES SF 6432-CS (10-98) SECTION II STANDARD TERMS & CONDITIONS FOR COMMERCIAL SERVICES PROCURED ON A FIRM FIXED PRICE OR FIXED RATE BASIS THE FOLLOWING CLAUSES APPLY TO THIS CONTRACT AS INDICATED UNLESS SPECIFICALLY DELETED, OR EXCEPT TO THE EXTENT THEY ARE SPECIFICALLY SUPPLEMENTED OR AMENDED IN WRITING IN THE SIGNATURE PAGE OR SECTION I. CS10 - DEFINITIONS The following terms shall have the meanings set forth below for all purposes of this contract. (a) GOVERNMENT means the United States of America and includes the U.S. Department of Energy (DOE) or any duly authorized representative thereof. (b) SANDIA means Sandia National Laboratories, operated by Sandia Corporation under Contract No. DE-ACO4-94AL-85000 with the U.S. Department of Energy.

456

NATIONAL POLICY ASSURANCES  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

TO BE INCLUDED AS AWARD TERMS 1. Nondiscrimination - By signing or accepting funds under the agreement, the recipient agrees that it will comply with applicable provisions of the following national policies prohibiting discrimination: Applies to: Required by: Additional Requirements: Discrimination on the basis of race, color, or national origin Grants, cooperative agreements, and subawards (10 C.F.R. § 600.3) 10 C.F.R. Part 600, App. A; 10 C.F.R. Part 1040; Title VI of the Civil Rights Act of 1964, 42 U.S.C. § 2000d et seq. Requirements flow down to subawards (10 C.F.R. §§ 1040.83 & 89-2) Discrimination on the basis of race, color, religion, sex, or national origin against any person employed by or seeking employment with Government

457

National Land Cover Data  

NLE Websites -- All DOE Office Websites (Extended Search)

National Land Cover Data National Land Cover Data Metadata also available as Metadata: q Identification_Information q Data_Quality_Information q Spatial_Data_Organization_Information q Spatial_Reference_Information q Entity_and_Attribute_Information q Distribution_Information q Metadata_Reference_Information Identification_Information: Citation: Citation_Information: Originator: United States Geological Survey Publication_Date: Unpublished Material Title: National Land Cover Data Edition: 01 Geospatial_Data_Presentation_Form: raster digital data Other_Citation_Details: Classification and processing of the orginal remote sensing products was done by the Multi-Resolution Land Characterization Consortium and EROS Data Center (U.S. Geological Survey). The Consortium includes the

458

Alamos National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

record neutron beam at Los record neutron beam at Los Alamos National Laboratory July 10, 2012 New method has potential to advance materials measurement LOS ALAMOS, New Mexico, July 10, 2012-Using a one-of-a-kind laser system at Los Alamos National Laboratory, scientists have created the largest neutron beam ever made by a short-pulse laser, breaking a world record. Neutron beams are usually made with particle accelerators or nuclear reactors and are commonly used in a wide variety of scientific research, particularly in advanced materials science. Using the TRIDENT laser, a unique and powerful 200 trillion-watt short-pulse laser, scientists from Los Alamos, the Technical University of Darmstadt, Germany, and Sandia National Laboratories focus high-intensity light on an ultra-thin plastic sheet

459

National Energy Policy  

NLE Websites -- All DOE Office Websites (Extended Search)

Energy Energy Policy May 2001 Report of the National Energy Policy Development Group Reliable, Affordable, and Environmentally Sound Energy for America's Future Report of the National Energy Policy Development Group "America must have an energy policy that plans for the future, but meets the needs of today. I believe we can develop our natural resources and protect our environment." - President George W. Bush For Sale by the Superintendent of Documents, U.S Government Printing Office Internet: bookstore.gpo.gov Phone: (202) 512-1800 Fax: (202) 512-2250 Mail: Stop SSOP, Washington, DC 20402-0001 ISBN 0-16-050814-2 Members of the National Energy Policy Development Group DICK CHENEY The Vice President COLIN L. POWELL The Secretary of State PAUL O'NEILL The Secretary of the Treasury

460

National Nuclear Security Administration  

NLE Websites -- All DOE Office Websites

National Nuclear Security Administration 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 US, UK, France Discuss Stockpile Stewardship, Arms Control and Nonproliferation and Visit the Nevada National Security Site Learn More NNSA DOE removes all remaining HEU from Hungary Learn More DOE removes all remaining HEU from Hungary Tiffany A. Blanchard-Case receives 2013 Linton Brooks Medal

Note: This page contains sample records for the topic "national spherical torus" 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

National Synchrotron Light Source  

NLE Websites -- All DOE Office Websites (Extended Search)

Report 2001 Report 2001 National Synchrotron Light Source For the period October 1, 2000 through September 30, 2001 Introduction Science Highlights Year in Review Operations Publications Abstracts Nancye Wright & Lydia Rogers The National Synchrotron Light Source Department is supported by the Office of Basic Energy Sciences United States Department of Energy Washington, D.C. Brookhaven National Laboratory Brookhaven Science Associates, Inc. Upton, New York 11973 Under Contract No. DE-AC02-98CH10886 Mary Anne Corwin Steven N. Ehrlich & Lisa M. Miller Managing Editor Science Editors Production Assistants Cover images (clockwise from top left) 1. from Science Highlight by K.R. Rajashankar, M.R. Chance, S.K. Burley, J. Jiang, S.C. Almo, A. Bresnick, T. Dodatko, R. Huang, G. He,

462

Idaho National Laboratory - Reports  

NLE Websites -- All DOE Office Websites (Extended Search)

Reports Reports Idaho National Laboratory Review Reports 2013 Review of Radiation Protection Program Implementation at the Advanced Mixed Waste Treatment Project of the Idaho Site, April 2013 Review of the Facility Representative Program at the Idaho Site, March 2013 Activity Reports 2013 Accident Investigation at the Idaho National Laboratory Engineering Demonstration Facility, February 2013 Review Reports 2012 Review of Radiation Protection Program Implementation at the Idaho Site, November 2012 Assessment of Nuclear Safety Culture at the Idaho Cleanup Project Sodium Bearing Waste Treatment Project, November 2012 Review of Site Preparedness for Severe Natural Phenomena Events at the Idaho National Laboratory, July 2012 Review of the Sodium Bearing Waste Treatment Project - Integrated Waste Treatment Unit Federal Operational Readiness Review, June 2012

463

Consent Order, Lawrence Livermore National National Security, LLC -  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Lawrence Livermore National National Security, LLC - Lawrence Livermore National National Security, LLC - WCO-2010-01 Consent Order, Lawrence Livermore National National Security, LLC - WCO-2010-01 October 29, 2010 Consent Order issued to Lawrence Livermore National Security, LLC for deficiencies associated with the Lawrence Livermore National Laboratory Chronic Beryllium Disease Prevention Program This letter refers to the Office of Health, Safety and Security, Office of Enforcement investigation into deficiencies associated with the Lawrence Livermore National Laboratory (LLNL) Chronic Beryllium Disease Prevention Program (CBDPP) and related work planning and control processes. The results of the investigation were provided to Lawrence Livermore National Security, LLC (LLNS) in an Investigation Report dated July 7, 2009. An

464

Congratulations, 2013 National Science Bowl Winners | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Congratulations, 2013 National Science Bowl Winners Congratulations, 2013 National Science Bowl Winners April 29, 2013 - 6:31pm Addthis National Science Bowl 2013 1 of 16 National...

465

Nevada National Security Site | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Nevada National Security Site Nevada National Security Site Nevada National Security Site | October 2011 Control Point Nevada National Security Site | October 2011 Control Point...

466

National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

U.S. Department of Energy National Nuclear Security Administration Federal Equal Opportunity Recruitment Program Plan Certification - Fiscal Year 2009 Please type or print clearly and return this sheet with original signature to: Ms. Carmen Andujar, Manager Recruiting, Examining and Assessment Group Center for Talent and Capacity Policy Strategic Human Resources Policy Attn: FY 2009 FEORP Report U.S. Office of Personnel Management 1900 E Street, NW, Room 6547 Washington, D.C. 20415-9800 A. Name and Address of Agency National Nuclear Security Administration Office of Diversity and Outreach 1000 Independence Avenue, SW Washington, DC 20585 B. Name and Title of Designated FEORP Official (include address, if different from above,

467

Security | Argonne National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

Security Security Nonproliferation and Nuclear Forensics Decision Science Sensors and Materials Security Enhancing national and homeland security requires technological advancements in everything from biosensors to risk assessments. Game-changing scientific discovery is required for the development of sensors, detectors and other technological advancements used to protect and defend our country. At Argonne, our highly collaborative community of scientists and engineers discover and develop critical security and defense technologies to prevent and mitigate events with the potential for mass disruption or destruction, thereby protecting our citizens and our national interests. Our goal is to make America a safer place through innovations in threat decision science, sensors and materials, infrastructure assurance,

468

Brookhaven National Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

National Synchrotron Light Source National Synchrotron Light Source Subject: NSLS Conduct of Operations Manual Number: LS-CO-0001 Revision: B Effective: 10/22/2007 Page 1 of 38 M. Buckley E. Zivogel A. Ackerman S. Dierker Prepared By: Approved By: J. Murphy C-C. Kao Revision Log *Approval signatures on file with master copy. TABLE OF CONTENTS Page INTRODUCTION ........DOE Order 5480.19...........................................................................................2 CHAPTER I ..................OPERATIONS ORGANIZATION AND ADMINISTRATION ......................3 CHAPTER II.................SHIFT ROUTINES & OPERATING PRACTICES .........................................6 CHAPTER III ...............CONTROL AREA ACTIVITIES......................................................................9

469

National Energy Technology Laboratory  

NLE Websites -- All DOE Office Websites (Extended Search)

CRTD-80 CRTD-80 National Energy Technology Laboratory Final Report Carbon Sequestration Project Review Meeting Greater Pittsburgh International Airport Hyatt Hotel September 26-29, 2005 Volume I: Meeting Summary and Recommendations José D. Figueroa NETL Project Manager and Meeting Coordinator D:\Project Files\EPD\RDS Sequestration Project Review Task\Volume 1\ASME Final Version Nov 28 2005\2005 Carbon Sequestration Project Review Meeting Final 11292005.doc National Energy Technology Laboratory Final Report Carbon Sequestration Project Review Meeting Greater Pittsburgh International Airport Hyatt Hotel September 26-29, 2005 Volume I: Meeting Summary and Recommendations José D. Figueroa NETL Project Manager and Meeting Coordinator

470

Implementing the National Broadband  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Type text] Type text] Response to Request for Information from the Department of Energy: Implementing the National Broadband Plan by Empowering Consumers and the Smart Grid: Data Access, Third Party Use, and Privacy [FR Doc. 2010-11127] July 12, 2010 EnerNOC Page 2 of 8 EnerNOC, Inc. ("EnerNOC") is pleased to provide these comments to the Department of Energy in response to the Request for Information "Implementing the National Broadband Plan by Empowering Consumers and the Smart Grid: Data Access, Third Party Use, and Privacy." EnerNOC is a provider of demand response and energy efficiency solutions to utilities, Independent

471

2012 National Electricity Forum  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

U.S. Department of Energy U.S. Department of Energy National Electric Transmission Congestion Study Workshop - December 6, 2011 National Electric Transmission Congestion Study Workshop - December 6, 2011 Hilton Philadelphia Airport, 4509 Island Avenue, Philadelphia, PA 19153 Hilton Philadelphia Airport, 4509 Island Avenue, Philadelphia, PA 19153 Agenda Agenda 8:00 am - 9:00 am Registration 9:00 am - 9:20 am DOE Welcome and Presentation David Meyer, US Department of Energy, Session Moderator 9:20 am - 10:30 am Panel I - Regulators * Garry Brown, Chairman, New York Public Service Commission * Edward S. Finley, Jr., Chairman, North Carolina Utilities Commission

472

Sandia National Laboratories (SNL)  

National Nuclear Security Administration (NNSA)

Sandia National Laboratories (SNL) Sandia National Laboratories (SNL) Current Projects with the Russian Federation Project Title: Development of Models of Energy Transfer in Nanostructured Materials. Russian Institute: Institute for Problems in Mechanical Engineering, Russian Academy of Sciences (IPME RAS), St. Petersburg. Brief Description: To develop modeling approaches and simulations to examine energy transport and transfer in materials with structural features at the nanoscale. Tasks include developing such a model for thin crystal structures subjected to short duration laser excitation, and using atomic-scale simulations to evaluate microscopic expressions for stress and heat flux in crystals containing defects such as vacancies, dislocations and bi-material interfaces.

473

National Nuclear Security Administration  

National Nuclear Security Administration (NNSA)

U.S. Department of Energy National Nuclear Security Administration Federal Equal Opportunity Recruitment Program Plan Certification - Fiscal Year 2011 Please type or print clearly and return this sheet with original signature to: Ms. Carmen Andujar, Manager Recruiting, Examining and Assessment Group Center for Talent and Capacity Policy Strategic Human Resources Policy Attn: FY 2011 FEORP Report U.S. Office of Personnel Management 1900 E Street, NW, Room 6547 Washington, D.C. 20415-9800 A. Name and Address of Agency National Nuclear Security Administration 1000 Independence Avenue, SW Washington, DC 20585 B. Name and Title of Designated FEORP Official (include address, if different from above,

474

SUBJECT: National Nuclear Security Administration  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

National Nuclear Security Administration Sandia Site Ofce P. 0. Box 5400 Albuquerque, NM 87185 JAN O=P= ONP= Annual National Environmental Policy Act Planning Sumary 2013 Attached is: the Annual National Environmental Policy Act (NEPA) Planning Summary for the National Nuclear Security Administation, Sandia Site Ofce (SSO). Currently, there are two environmental assessments planned and one environmental impact statement in progess for the

475

from Savannah River National Laboratory  

Issue: Depleted uranium present in shallow soils and sediments at Lawrence Livermore National Laboratory Site 300.

476

Lawrence Livermore National Laboratory - Reports  

NLE Websites -- All DOE Office Websites (Extended Search)

Lawrence Livermore National Laboratory Lawrence Livermore National Laboratory Review Reports 2013 Independent Oversight Review of the Fire Protection Program at Lawrence Livermore National Laboratory, September 2013 Independent Oversight Review of Preparedness for Severe Natural Phenomena Events at the Lawrence Livermore National Laboratory, July 2013 Activity Reports 2013 Lawrence Livermore National Laboratory Operational Drill at the B332 Plutonium Facility, February 2013 Activity Reports 2012 Lawrence Livermore National Laboratory Site Lead Planning Activities, October 2012 Review Reports 2011 Review of Integrated Safety Management System Effectiveness at the Livermore Site Office, October 2011 Review of Integrated Safety Management System Effectiveness at Lawrence Livermore National Laboratory, September 2011

477

Nevada National Security Site - Reports  

NLE Websites -- All DOE Office Websites (Extended Search)

Reports Reports Nevada National Security Site Review Reports 2013 Independent Oversight Targeted Review of the Safety Significant Blast Door and Special Door Interlock Systems and Review of Federal Assurance Capability at the Nevada National Security Site, December 2013 Review of the Nevada National Security Site Criticality Safety Program Corrective Action Plan Closure, May 2013 Review Reports 2012 Review of the Nevada National Security Site Implementation Verification Review Processes, March 2012 Activity Reports 2012 Nevada National Security Site Operational Awareness Visit, December 2012 Operational Awareness Oversight of the Nevada National Security Site, August 2012 Review Reports 2011 Review of Nevada Site Office and National Security Technologies, LLC, Line Oversight and Contractor Assurance Systems

478

A Mass-Conservative, Positive-Definite, and Efficient Eulerian Advection Scheme in Spherical Geometry and on a Nonuniform Grid System  

Science Conference Proceedings (OSTI)

The flux-form advection scheme of Bott is modified for the spherical coordinates, combined with the expanded-polar-zone (EPZ) technique to improve the overall performance of the advection calculations. With the EPZ technique, this Eulerian scheme ...

Yonghong Li; Julius S. Chang

1996-10-01T23:59:59.000Z

479

National Account Customer Needs  

Science Conference Proceedings (OSTI)

A survey conducted in the mid-1990s explored the communications-based services national account customers desired to support their energy procurement and utilization needs. The new study reported here re-interviewed many participants from the original survey to identify changes in their thinking and practices in the light of their experience over the last 5 to 7 years.

2002-05-17T23:59:59.000Z

480

National Infrastructure Protection Plan  

E-Print Network (OSTI)

this context, our critical infrastructure and key resources (CIKR) may be directly exposed to the event themselves or indirectly exposed as a result of the dependencies and interde- pendencies among CIKR. Within the CIKR protection mission area, national priorities must include preventing catastrophic loss of life

Sen, Pradeep

Note: This page contains sample records for the topic "national spherical torus" 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.


481

ARGONNE NATIONAL LABORATORY  

NLE Websites -- All DOE Office Websites (Extended Search)

L e m o n t , I l l i n o i s ENVIRONMENTAL RADIOACTIVITY AT ARGONNE NATIONAL LABORATORY R e p o r t f o r t h e Y e a r 1954 W r i t t e n by J. Sedlet E x p e r i m e n t a l w...

482

National Renewable Energy Laboratory  

E-Print Network (OSTI)

how scientists evaluate solar cells Spring 2009 National Wind Technology Center prepares to install the optimal design and construction for the hot and dry Sacramento climate. The home is made solar cell efficiency--is improving how the scientific community evaluates solar cell performance

483

National Magnetic Anomaly Map  

DOE Green Energy (OSTI)

A record of the conclusions of a three-day meeting and workshop of the Committee for a National Magnetic Anomaly Map held in February 1976 is presented. The purpose of he workshop was to prepare a statement of the benefits, objectives, specifications, and requirements of a NMAM and establish a working plan for producing the map. (ACR)

Not Available

1976-01-01T23:59:59.000Z

484

Pacific Northwest National Laboratory  

E-Print Network (OSTI)

Science. Technology. Innovation. PNNL-SA-34741 Pacific Northwest National Laboratory (PNNL) is addressing cognition and learning to the development of student- centered, scenario-based training. PNNL's Pachelbel (PNNL) has developed a cognitive-based, student-centered approach to training that is being applied

485

The National Ignition Facility (NIF) and the National Ignition Campaign (NIC)  

SciTech Connect

The National Ignition Facility (NIF), the world's largest and most powerful laser system for inertial confinement fusion (ICF) and experiments studying high-energy-density (HED) science, is now operational at Lawrence Livermore National Laboratory (LLNL). NIF construction was certified by the Department of Energy as complete on March 27, 2009. NIF, a 192-beam Nd:glass laser facility, will ultimately produce 1.8-MJ, 500-TW of 351-nm third-harmonic, ultraviolet light. On March 10, 2009, total 192-beam energy of 1.1 MJ was demonstrated; this is approximately 30 times more energy than ever produced in an ICF laser system. The principal goal of NIF is to achieve ignition of a deuterium-tritium (DT) fuel capsule and provide access to HED physics regimes needed for experiments related to national security, fusion energy and broader frontier scientific exploration. NIF experiments in support of indirect-drive ignition began in August 2009. These first experiments represent the next phase of the National Ignition Campaign (NIC). The NIC is a national effort to achieve fusion ignition and is coordinated through a detailed execution plan that includes the science, technology, and equipment. Equipment required for ignition experiments includes diagnostics, a cryogenic target manipulator, and user optics. Participants in this effort include LLNL, General Atomics (GA), Los Alamos National Laboratory (LANL), Sandia National Laboratory (SNL), and the University of Rochester Laboratory for Energetics (LLE). The primary goal for NIC is to have all of the equipment operational, integrated into the facility, and ready to begin a credible ignition campaign in 2010. With NIF now operational, the long-sought goal of achieving self-sustained nuclear fusion and energy gain in the laboratory is much closer to realization. Successful demonstration of ignition and net energy gain on NIF will be a major step towards demonstrating the feasibility of Inertial Fusion Energy (IFE) and will likely focus the world's attention on the possibility of an ICF energy option. NIF experiments to demonstrate ignition and gain will use central-hot-spot (CHS) ignition, where a spherical fuel capsule is simultaneously compressed and ignited. The scientific basis for CHS has been intensively developed. Achieving ignition with CHS will open the door for other advanced concepts, such as the use of high-yield pulses of visible wavelength rather than ultraviolet and Fast Ignition concepts. Moreover, NIF will have important scientific applications in such diverse fields as astrophysics, nuclear physics and materials science. The NIC will develop the full set of capabilities required to operate NIF as a major national and international user facility. A solicitation for NIF frontier science experiments is planned for summer 2009. This paper summarizes the design, performance, and status of NIF and plans for the NIF ignition experimental program. A brief summary of the overall NIF experimental program is also presented.

Moses, E

2009-09-17T23:59:59.000Z

486

848 Brazilian Journal of Physics, vol. 33, no. 4, December, 2003 Spherical Tokamak Development in Brazil  

E-Print Network (OSTI)

in Brazil G.O. Ludwig, E. Del Bosco, J.G. Ferreira, L.A. Berni, R.M. Oliveira, M.C.R. Andrade, C.S. Shibata 12227-010, S~ao Jos´e dos Campos, SP, Brazil Received on 18 March, 2003. Revised version received on 19 Plasma Laboratory (LAP) of the National Space Research Institute (INPE) in Brazil. Figure 1. An overall

487

FY 2009 National Security Technologies, LLC, PER Summary | National Nuclear  

National Nuclear Security Administration (NNSA)

National Security Technologies, LLC, PER Summary | National Nuclear National Security Technologies, LLC, PER Summary | 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 FY 2009 National Security Technologies, LLC, PER Summary Home > About Us > Our Operations > Acquisition and Project Management > Performance Evaluations > FY 2009 National Security Technologies, LLC, PER

488

FY 2011 National Security Technologies, LLC, PER Summary | National Nuclear  

National Nuclear Security Administration (NNSA)

National Security Technologies, LLC, PER Summary | National Nuclear National Security Technologies, LLC, PER Summary | 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 FY 2011 National Security Technologies, LLC, PER Summary Home > About Us > Our Operations > Acquisition and Project Management > Performance Evaluations > FY 2011 National Security Technologies, LLC, PER

489

FY 2007 National Security Technologies, LLC, PER Summary | National Nuclear  

National Nuclear Security Administration (NNSA)

National Security Technologies, LLC, PER Summary | National Nuclear National Security Technologies, LLC, PER Summary | 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 FY 2007 National Security Technologies, LLC, PER Summary Home > About Us > Our Operations > Acquisition and Project Management > Performance Evaluations > FY 2007 National Security Technologies, LLC, PER

490

David W Johnson | Princeton Plasma Physics Lab  

NLE Websites -- All DOE Office Websites (Extended Search)

W Johnson W Johnson Principal Research Physicist, Head, ITER Fabrication David Johnson is a principal research physicist with broad experience in techniques and instrumentation for measuring the characteristics of magnetic fusion plasmas. He has specific expertise in laser Thomson scattering systems, and has installed and operated such systems on many fusion devices around the world. He managed a division of plasma diagnostic experts for the Tokamak Fusion Test Reactor (TFTR) and National Spherical Torus Experiment (NSTX) projects, more recently becoming the Work Breakdown Structure Team Leader for US ITER Diagnostics. He has served on numerous national and international committees related to diagnostic development. Interests Plasma diagnostics techniques and instrumentation

491

The National Initiative for Cybersecurity Education (NICE)  

Science Conference Proceedings (OSTI)

... The National Cyber Security Division outlines the Department of Homeland Security's strategic national cybersecurity objectives. ...

2013-07-09T23:59:59.000Z

492

S ARGONNE NATIONAL LABORATORY  

NLE Websites -- All DOE Office Websites (Extended Search)

ARGONNE NATIONAL LABORATORY ARGONNE NATIONAL LABORATORY 19 ON CLOSED SHEIIS IN NUCLEI. II Maria G. Mayer April., 1949 Feenberg (1) ' (2) and Nordlkeim (3) have used the spins and magnetic moments of the even-odd nuclei to determine the angular momentum of the eigenfunction of the odd particle. The tabulations given by them indi- cate that spin orbit coupling favors the state of higher total angular momentum, If - strong spin.orbit coupling' increasing with angular mom- entum is assumed, a level assignment encounters a very few contradictions. with experimental facts and requires no major crossing of the levels from those of a square well potential. The magic numbers O, 82, and 126 occur at the' place of the spin-orbit splitting of levels of high angular momen- tum, Table 1 contains in column two in order

493

NATIONAL ENERGY POLICY  

NLE Websites -- All DOE Office Websites (Extended Search)

viii viii Over the next 20 years, growth in U.S. energy consumption will increasingly outpace U.S. energy production, if production only grows at the rate of the last 10 years. ________ Sources: Sandia National Laboratories and U.S. Department of Energy, Energy Information Administration. (Quadrillion Btus) 2000 2005 2010 2015 2020 Energy Production at 1990-2000 Growth Rates 140 120 100 80 60 40 20 0 Overview Reliable, Affordable, and Environmentally Sound Energy for America's Future I n his second week in office, President George W. Bush established the Na- tional Energy Policy Development Group, directing it to "develop a national energy policy designed to help the private sector, and, as necessary

494

ARGONNE NATIONAL LABORATORY  

NLE Websites -- All DOE Office Websites (Extended Search)

IL IL 60439 ANL/MCS-TM-234 Users Guide for ROMIO: A High-Performance, Portable MPI-IO Implementation by Rajeev Thakur, Robert Ross, Ewing Lusk, William Gropp, Robert Latham Mathematics and Computer Science Division Technical Memorandum No. 234 Revised May 2004, November 2007, April 2010 This work was supported by the Mathematical, Information, and Computational Sciences Division subpro- gram of the Office of Advanced Scientific Computing Research, U.S. Department of Energy, under Contract W-31-109-Eng-38; and by the Scalable I/O Initiative, a multiagency project funded by the Defense Ad- vanced Research Projects Agency (Contract DABT63-94-C-0049), the Department of Energy, the National Aeronautics and Space Administration, and the National Science Foundation. Contents Abstract 1 1 Introduction 1 2 Major Changes in This Version 1 3 General Information 1 3.1 ROMIO Optimizations

495

Implementing the National Broadband  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Before the Before the Department of Energy Washington, D.C. 20585 In the Matter of Implementing the National Broadband Plan by Studying the Communications Requirements of Electric Utilities To Inform Federal Smart Grid Policy NBP RFI: Communications Requirements COMMENTS OF BALTIMORE GAS & ELECTRIC COMPANY I. Introduction BGE is the nation's oldest and most experienced utility company. It has met the energy needs of central Maryland for nearly 200 years. Today, it serves more than 1.2 million business and residential electric customers, and approximately 650,000 gas customers in an economically diverse, 2,300-square-mile area encompassing Baltimore City and all or part of ten central Maryland counties.

496

ARGONNE NATIONAL LABORATORY  

NLE Websites -- All DOE Office Websites (Extended Search)

Empirical Empirical performance modeling of GPU kernels using active learning 1 Prasanna Balaprakash 2 , Karl Rupp 2 , Azamat Mametjanov 2 , Robert B. Gramacy 3 , Paul D. Hovland 2 , Stefan M. Wild 2 Mathematics and Computer Science Division Preprint ANL/MCS-P4097-0713 July 2013 1 Support for this work was provided through the SciDAC program funded by U.S. Department of Energy, Office of Science, Advanced Scientific Computing Research, under Contract No. DE-AC02-06CH11357. 2 Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, IL 60439, USA 3 Booth School of Business, University of Chicago Empirical performance modeling of GPU kernels using active learning Prasanna Balaprakash 1 , Karl Rupp 1 , Azamat Mametjanov 1 Robert B. Gramacy 2 , Paul D. Hovland 1 , Stefan M. Wild 1 Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, IL 60439

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Northwest National Labo-  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Northwest National Labo- Northwest National Labo- ratory. Daniel Poneman, Deputy Secretary of Energy, dis- cussed the importance of having the Federal and contractor staffs working closely together and using peer reviews and the DOE core management princi- ples to provide excellence in project management. Mel Williams, Jr., Associate Deputy Secretary of En- ergy, discussed the leader- ship principles of align- ment, accountability and execution. A special thanks to all who made the workshop a suc- cess. These presenta- tions, and others provided at the event, are posted at the link below. By Steven H. Rossi, P.E., PMP, LEED AP, CCE OECM On March 15-16, the Office of Engineering and Con- struction Management (OECM) hosted the 2011 DOE Project Management Workshop at the Holiday

498

The National Renewable  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

National Renewable National Renewable Energy Laboratory's (NREL) Alternative Fuels Utilization Program, which is widely known for its alternative fuel vehicle (AFV) emissions information, is also doing much to bring better alternative fuel vehicles to the field. Many of the AFVs of tomor- row will include components developed through NREL's research, which is sponsored by the U.S. Department of Energy (DOE). Most of NREL's projects involve ethanol