Powered by Deep Web Technologies
Note: This page contains sample records for the topic "milliseconds proton emission" 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.


1

Radio Profile Instability in the Millisecond Pulsar PSR J0437-4715 due to Spiky Emission  

E-Print Network [OSTI]

The instability in one of the components of the radio integrated profile (IP) of the millisecond pulsar PSr J0437-4715 is correlated with the occurrence of the spiky emission in that component. It is speculated that the instability in other components is also due to the spiky emission. This might have important implications for interpreting the individual components of the IP as independent beams or regions of emission.

M. Vivekanand

2002-05-13T23:59:59.000Z

2

Implications of Low Energy X-ray Emission from Millisecond Radio Pulsars  

E-Print Network [OSTI]

Low energy X-ray emission (0.1-10 keV) from all six millisecond radio pulsars (MSPs) for which such emission has been reported support a proposed pulsar magnetic field evolution previously compared only to radiopulse data: old, very strongly spun-up neutron stars become mainly orthogonal rotators (magnetic dipole moment perpendicular to stellar spin) or aligned rotators. The neutron star properties which lead to such evolution are reviewed. Special consideration is given to agreement between predictions and observed X-ray emission for the aligned MSP candidate PSR J0437-4715.

M. Ruderman

2003-11-13T23:59:59.000Z

3

-delayed proton emission branches in 43Cr  

SciTech Connect (OSTI)

The + decay of very neutron-deficient 43Cr was studied by means of an imaging time projection chamber that allowed recording tracks of charged particles. Events of -delayed emission of one, two, and three protons were clearly identified. The absolute branching ratios for these channels were determined to be (81 4)%, (7.1 0.4)%, and (0.08 0.03)%, respectively. 43Cr is thus established as the second case in which the -3p decay occurs. Although the feeding to the proton-bound states in 43V is expected to be negligible, the large branching ratio of (12 4)% for decays without proton emission is found.

Pomorski, M. [University of Warsaw; Miernik, K. [University of Warsaw; Dominik, W. [University of Warsaw; Janas, Z. [University of Warsaw; Pfutzner, M. [University of Warsaw; Bingham, C. R. [University of Tennessee, Knoxville (UTK); Czyrkowski, H. [University of Warsaw; Cwiok, Mikolaj [Warsaw University; Darby, Iain [University of Tennessee, Knoxville (UTK); Dabrowski, Ryszard [Warsaw University; Ginter, T. N. [Michigan State University, East Lansing; Grzywacz, Robert Kazimierz [ORNL; Karny, M. [University of Warsaw; Korgul, A. [University of Warsaw; Kusmierz, W. [University of Warsaw; Liddick, Sean [University of Tennessee, Knoxville (UTK); Rajabali, M. M. [University of Tennessee, Knoxville (UTK); Rykaczewski, Krzysztof Piotr [ORNL; Stolz, A. [Michigan State University, East Lansing

2011-01-01T23:59:59.000Z

4

Proton emission induced by polarized photons  

E-Print Network [OSTI]

The proton emission induced by polarized photons is studied in the energy range above the giant resonance region and below the pion emission threshold. Results for the 12C, 16O and 40Ca nuclei are presented. The sensitivity of various observables to final state interaction, meson exchange currents and short range correlations is analyzed. We found relevant effects due to the virtual excitation of the $\\Delta$ resonance.

M. Anguiano; G. Co'; A. M. Lallena

2006-08-29T23:59:59.000Z

5

PULSED GAMMA RAYS FROM THE ORIGINAL MILLISECOND AND BLACK WIDOW PULSARS: A CASE FOR CAUSTIC RADIO EMISSION?  

SciTech Connect (OSTI)

We report the detection of pulsed gamma-ray emission from the fast millisecond pulsars (MSPs) B1937+21 (also known as J1939+2134) and B1957+20 (J1959+2048) using 18 months of survey data recorded by the Fermi Large Area Telescope and timing solutions based on radio observations conducted at the Westerbork and Nancay radio telescopes. In addition, we analyzed archival Rossi X-ray Timing Explorer and XMM-Newton X-ray data for the two MSPs, confirming the X-ray emission properties of PSR B1937+21 and finding evidence ({approx}4{sigma}) for pulsed emission from PSR B1957+20 for the first time. In both cases the gamma-ray emission profile is characterized by two peaks separated by half a rotation and are in close alignment with components observed in radio and X-rays. These two pulsars join PSRs J0034-0534 and J2214+3000 to form an emerging class of gamma-ray MSPs with phase-aligned peaks in different energy bands. The modeling of the radio and gamma-ray emission profiles suggests co-located emission regions in the outer magnetosphere.

Guillemot, L.; Kramer, M.; Freire, P. C. C.; Noutsos, A. [Max-Planck-Institut fuer Radioastronomie, 53121 Bonn (Germany); Johnson, T. J.; Harding, A. K. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Venter, C. [Centre for Space Research, North-West University, Potchefstroom Campus, 2520 Potchefstroom (South Africa); Kerr, M.; Michelson, P. F. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Pancrazi, B. [CNRS, IRAP, F-31028 Toulouse Cedex 4 (France); Livingstone, M. [Department of Physics, McGill University, Montreal, PQ H3A 2T8 (Canada); Janssen, G. H.; Jaroenjittichai, P.; Stappers, B. W.; Espinoza, C. M. [Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, M13 9PL (United Kingdom); Cognard, I. [Laboratoire de Physique et Chimie de l'Environnement, LPCE UMR 6115 CNRS, F-45071 Orleans Cedex 02 (France); Camilo, F. [Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States); Gargano, F. [Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari (Italy); Grove, J. E. [Space Science Division, Naval Research Laboratory, Washington, DC 20375-5352 (United States); Johnston, S., E-mail: guillemo@mpifr-bonn.mpg.de, E-mail: tyrel.j.johnson@gmail.com, E-mail: Christo.Venter@nwu.ac.za, E-mail: kerrm@stanford.edu [CSIRO Astronomy and Space Science, Australia Telescope National Facility, Epping NSW 1710 (Australia); and others

2012-01-01T23:59:59.000Z

6

Reverse Shock Emission and Ionization Break Out Powered by Post-merger Millisecond Magnetars  

E-Print Network [OSTI]

There is accumulating evidence that at least a fraction of binary neutron star mergers result in rapidly spinning magnetars, with subrelativistic neutron-rich ejecta as massive as a small fraction of solar mass. The ejecta could be heated continuously by the Poynting flux emanated from the central magnetars. Such Poynting flux could become lepton-dominated so that a reverse shock develops. It was demonstrated that such a picture is capable of accounting for the optical transient PTF11agg (Wang & Dai 2013b). In this paper we investigate the X-ray and ultraviolet (UV) radiation as well as the optical and radio radiation studied by Wang & Dai (2013b). UV emission is particularly important because it has the right energy to ionize the hot ejecta at times $t\\lesssim 600$ s. It is thought that the ejecta of binary neutron star mergers are a remarkably pure sample of r-process material, about which our understanding is still incomplete. In this paper we evaluate the possibility of observationally determining...

Wang, Ling-Jun; Yu, Yun-Wei

2015-01-01T23:59:59.000Z

7

Light meson emission in (anti)proton induced reactions  

E-Print Network [OSTI]

Reactions induced by high energy antiprotons on proton on nuclei are accompanied with large probability by the emission of a few mesons. Interesting phenomena can be observed and QCD tests can be performed, through the detection of one or more mesons. The collinear emission from high energy (anti)proton beams of a hard pion or vector meson, can be calculated similarly to the emission of a hard photon from an electron \\cite{Kuraev:2013izz}. This is a well known process in QED, and it is called the "Quasi-Real Electron method", where the incident particle is an electron and a hard photon is emitted leaving an 'almost on shell' electron impinging on the target \\cite{Baier:1973ms}. Such process is well known as Initial State Emission (ISR) method of scanning over incident energy, and can be used, in the hadron case, to produce different kind of particles in similar kinematical conditions. In case of emission of a charged light meson, $\\pi$ or $\\rho$-meson, in proton-proton(anti-proton) collisions, the meson can b...

Kuraev, E A; Tomasi-Gustafsson, E

2015-01-01T23:59:59.000Z

8

Proc. of Atmospheric Studies by Optical Methods (2001) :16 Optical Emissions from Proton Aurora  

E-Print Network [OSTI]

Proc. of Atmospheric Studies by Optical Methods (2001) :1­6 Optical Emissions from Proton Aurora D, Tokyo, Japan Received: x.x.2001 ­ Accepted: x.x.2002 Abstract. Hydrogen emissions are the signature of proton aurora. The Doppler-shifted hydrogen emission lines can be inter- preted in terms of the mean

Lummerzheim, Dirk

9

Beta-delayed proton emission in the 100Sn region  

E-Print Network [OSTI]

Beta-delayed proton emission from nuclides in the neighborhood of 100Sn was studied at the National Superconducting Cyclotron Laboratory. The nuclei were produced by fragmentation of a 120 MeV/nucleon 112Sn primary beam on a Be target. Beam purification was provided by the A1900 Fragment Separator and the Radio Frequency Fragment Separator. The fragments of interest were identified and their decay was studied with the NSCL Beta Counting System (BCS) in conjunction with the Segmented Germanium Array (SeGA). The nuclei 96Cd, 98Ing, 98Inm and 99In were identified as beta-delayed proton emitters, with branching ratios bp = 5.5(40)%, 5.5+3 -2%, 19(2)% and 0.9(4)%, respectively. The bp for 89Ru, 91,92Rh, 93Pd and 95Ag were deduced for the first time with bp = 3+1.9 -1.7%, 1.3(5)%, 1.9(1)%, 7.5(5)% and 2.5(3)%, respectively. The bp = 22(1)% for 101Sn was deduced with higher precision than previously reported. The impact of the newly measured bp values on the composition of the type-I X-ray burst ashes was studied.

Lorusso, G; Amthor, A; Baumann, T; Bazin, D; Berryman, J S; Brown, B A; Cyburt, R H; Crawford, H L; Estrade, A; Gade, A; Ginter, T; Guess, C J; Hausmann, M; Hitt, G W; Mantica, P F; Matos, M; Meharchand, R; Minamisono, K; Montes, F; Perdikakis, G; Pereira, J; Portillo, M; Schatz, H; Smith, K; Stoker, J; Stolz, A; Zegers, R G T

2012-01-01T23:59:59.000Z

10

First Observation of Beta-Delayed Three-Proton Emission in 45Fe  

SciTech Connect (OSTI)

The decay of extremely neutron deficient 45Fe has been studied by means of a new type of a gaseous detector in which a technique of digital imaging was used to record tracks of charged particles. The + decay channels accompanied by proton emission were clearly identified. In addition to -delayed one-proton and -delayed two-proton decays, -delayed three-proton emission was recorded which represents the first direct and unambiguous observation of this decay channel. The branching ratio for the decay of 45Fe and the corresponding partial half-life are found to be 0.30 0.04 and T1/2( ) = 8.7 1.3 ms, respectively.

Miernik, K. [University of Warsaw; Dominik, Wojciech [Warsaw University; Janas, Z. [University of Warsaw; Pfutzner, M. [University of Warsaw; Bingham, C. R. [University of Tennessee, Knoxville (UTK); Czyrkowski, Henryk [Warsaw University; Cwiok, Mikolaj [Warsaw University; Darby, Iain [University of Tennessee, Knoxville (UTK); Djbrowski, R. [University of Warsaw; Ginter, T. N. [Michigan State University, East Lansing; Grzywacz, R. [University of Tennessee, Knoxville (UTK); Karny, M. [University of Warsaw; Korgul, A. [University of Warsaw; Kusmierz, W. [University of Warsaw; Liddick, Sean [University of Tennessee, Knoxville (UTK); Rajabali, Mustafa [University of Tennessee, Knoxville (UTK); Rykaczewski, Krzysztof Piotr [ORNL; Stolz, A. [Michigan State University, East Lansing

2007-01-01T23:59:59.000Z

11

First observation of {beta}-delayed three-proton emission in {sup 45}Fe  

SciTech Connect (OSTI)

The decay of extremely neutron deficient {sup 45}Fe has been studied by means of a new type of a gaseous detector in which a technique of digital imaging was used to record tracks of charged particles. The {beta}{sup +} decay channels accompanied by proton emission were clearly identified. In addition to {beta}-delayed one-proton and {beta}-delayed two-proton decays, {beta}-delayed three-proton emission was recorded which represents the first direct and unambiguous observation of this decay channel. The branching ratio for the {beta} decay of {sup 45}Fe and the corresponding partial half-life are found to be 0.30{+-}0.04 and T{sub 1/2}({beta})=8.7{+-}1.3 ms, respectively.

Miernik, K.; Dominik, W.; Janas, Z.; Pfuetzner, M.; Czyrkowski, H.; Cwiok, M.; DaPbrowski, R.; Karny, M.; Korgul, A.; Kusmierz, W. [Institute of Experimental Physics, Warsaw University, PL-00-681 Warsaw (Poland); Bingham, C. R.; Darby, I. G.; Liddick, S. N.; Rajabali, M. [Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States); Ginter, T.; Stolz, A. [National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States); Grzywacz, R. [Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States); Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Rykaczewski, K. [Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

2007-10-15T23:59:59.000Z

12

One proton, two proton, and alpha emission from 14o+alpha resonance interactions  

E-Print Network [OSTI]

) reactions occurring at different places in the helium gas target were identified. With this information, we were able to measure a spectrum of protons corresponding to the population of 17F particle stable states in the 14O(a, p)17F reaction. This method...

Fu, Changbo

2009-05-15T23:59:59.000Z

13

Beta-delayed proton emission in neutron-deficient lanthanide isotopes  

SciTech Connect (OSTI)

Forty-two ..beta..-delayed proton precursors with 56less than or equal toZless than or equal to71 and 63less than or equal toNless than or equal to83 were produced in heavy-ion reactions at the Lawrence Berkeley Laboratory SuperHILAC and their radioactive decay properties studied at the on-line mass separation facility OASIS. Twenty-five isotopes and eight delayed proton branches were identified for the first time. Delayed proton energy spectra and proton coincident ..gamma..-ray and x-ray spectra were measured for all precursors. In a few cases, proton branching ratios were also determined. The precursor mass numbers were determined by the separator, while the proton coincident x-ray energies provided unambiguous Z identifications. The proton coincident ..gamma..-ray intensities were used to extract final state branching ratios. Proton emission from ground and isomeric states was observed in many cases. The majority of the delayed proton spectra exhibited the smooth bell-shaped distribution expected for heavy mass precursors. The experimental results were compared to statistical model calculations using standard parameter sets. Calculations using Nilsson model/RPA ..beta..-strength functions were found to reproduce the spectral shapes and branching ratios better than calculations using either constant or gross theory ..beta..-strength functions. Precursor half-life predictions from the Nilsson model/RPA ..beta..-strength functions were also in better agreement with the measured half-lives than were gross theory predictions. The ratios of positron coincident proton intensities to total proton intensities were used to determine Q/sub EC/-B/sub p/ values for several precursors near N=82. The statistical model calculations were not able to reproduce the experimental results for N=81 precursors. 154 refs., 82 figs., 19 tabs.

Wilmarth, P.A.

1988-09-30T23:59:59.000Z

14

Millisecond Oxidation of Alkanes  

SciTech Connect (OSTI)

This project was undertaken in response to the Department of Energy's call to research and develop technologies 'that will reduce energy consumption, enhance economic competitiveness, and reduce environmental impacts of the domestic chemical industry.' The current technology at the time for producing 140 billion pounds per year of propylene from naphtha and Liquified Petroleum Gas (LPG) relied on energy- and capital-intensive steam crackers and Fluidized Catalytic Cracking (FCC) units. The propylene is isolated from the product stream in a costly separation step and subsequently converted to acrylic acid and other derivatives in separate production facilities. This project proposed a Short Contact Time Reactor (SCTR)-based catalytic oxydehydrogenation process that could convert propane to propylene and acrylic acid in a cost-effective and energy-efficient fashion. Full implementation of this technology could lead to sizeable energy, economic and environmental benefits for the U. S. chemical industry by providing up to 45 trillion BTUs/year, cost savings of $1.8 billion/year and a combined 35 million pounds/year reduction in environmental pollutants such as COx, NOx, and SOx. Midway through the project term, the program directive changed, which approval from the DOE and its review panel, from direct propane oxidation to acrylic acid at millisecond contact times to a two-step process for making acrylic acid from propane. The first step was the primary focus, namely the conversion of propane to propylene in high yields assisted by the presence of CO2. The product stream from step one was then to be fed directly into a commercially practiced propylene-to-acrylic acid tandem reactor system.

Scott Han

2011-09-30T23:59:59.000Z

15

{sup 12}O resonant structure evaluated by the two-proton emission process  

SciTech Connect (OSTI)

The characteristics of the {sup 12}O resonant ground state are investigated through the analysis of the experimental data for the two-proton decay process. The sequential and simultaneous two-proton emission decay modes have been considered in a statistical calculation of the decay energy distribution. The resonant structures of {sup 11}N have been employed as intermediate states for the sequential mode, having their parameters determined by considering the structure of single particle resonance in quantum scattering problem. The width of the {sup 12}O resonant ground state has been extracted from a best fit to the experimental data. The contributions from the different channels to the decay energy distribution have been evaluated, and width and peak location parameters of the {sup 12}O resonant ground state are compared with results of other works for the sequential and simultaneous two-proton decay modes.

Leite, T. N. [Colegiado de Engenharia Civil, Fundacao Universidade Federal do Vale do Sao Francisco, UNIVASF, C. Postal 309, 48900-000, Juazeiro, BA (Brazil); Teruya, N. [Departamento de Fisica, Universidade Federal da Paraiba, UFPB, Campus de Joao Pessoa, Caixa Postal 5008, 58051-970, Joao Pessoa, PB (Brazil); Dimarco, A. [Departamento de Ciencias Exatas e Tecnologicas, DCET, Universidade Estadual de Santa Cruz, UESC, Rodovia Ilheus-Itabuna, Km 16, 45650-000, Ilheus, BA (Brazil); Duarte, S. B.; Tavares, O. A. P. [Centro Brasileiro de Pesquisas Fisicas, CBPF/MCT, Rua Dr. Xavier Sigaud 150, 22290-180, Rio de Janeiro, RJ (Brazil); Goncalves, M. [Instituto de Radioprotecao e Dosimetria, IRD/CNEN, Av. Salvador Allende s/n, 22780-160, Rio de Janeiro, RJ (Brazil)

2009-07-15T23:59:59.000Z

16

Millisecond Oxidation of Alkanes  

Broader source: Energy.gov [DOE]

This factsheet describes a project whose goal is to commercialize a production process for propylene and acrylic acid from propane using a catalytic auto-thermal oxydehydrogenation process operating at short contact times. Auto-thermal oxidation for conversion of propane to propylene and acrylic acid promises energy savings of 20 trillion Btu per year by 2020. In addition to reducing energy consumption, this technology can reduce manufacturing costs by up to 25 percent, and reduce a variety of greenhouse gas emissions.

17

Proton-  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - SeptemberMicroneedlesAdvanced Photon SourceProtonWeak Charge DeterminedProton-

18

The Effects of {beta}-Delayed Proton Emission on the Path of the rp-Process  

SciTech Connect (OSTI)

The rp-process occurs in a hot hydrogen-rich stellar environment. Its trajectory passes through the most proton-rich nuclides in the periodic table. It has long been thought to be responsible for synthesizing at least the light p-process nuclides. Thus these nuclides can provide signatures for rp-process nucleosynthesis. Difficulties with various rp-process scenarios often focus on {sup 92,94}Mo and {sup 96,98}Ru p-nuclides, as their anomalously large abundances are difficult to produce in any model of nucleosynthesis. However, it now appears that they might be produced in the rp-process resulting from accretion onto a neutron star. If the rp-process does synthesize these nuclides, {beta}-delayed proton emission might well resolve some of the difficulties made evident by the model calculations.

Boyd, R.N.

2000-12-31T23:59:59.000Z

19

The influence of cluster emission and the symmetry energy on neutron-proton spectral double ratios  

E-Print Network [OSTI]

Emissions of free neutrons and protons from the central collisions of 124Sn+124Sn and 112Sn+112Sn reactions are simulated using the Improved Quantum Molecular Dynamics model with two different density dependence of the symmetry energy in the nuclear equation of state. The constructed double ratios of the neutron to proton ratios of the two reaction systems are found to be sensitive to the symmetry terms in the EOS. The effect of cluster formation is examined and found to affect the double ratios mainly in the low energy region. In order to extract better information on symmetry energy with transport models, it is therefore important to have accurate data in the high energy region which also is affected minimally by sequential decays.

Y. X. Zhang; P. Danielewicz; M. Famiano; Z. Li; W. G. Lynch; M. B. Tsang

2007-08-27T23:59:59.000Z

20

Single and double proton emissions from the O-14+He-4 interaction  

E-Print Network [OSTI]

RAPID COMMUNICATIONS PHYSICAL REVIEW C 76, 021603(R) (2007) Single and double proton emissions from the 14O+ 4He interaction Changbo Fu,1 V. Z. Goldberg,1,* A. M. Mukhamedzhanov,1 G. G. Chubarian,1 G. V. Rogachev,2 B. Skorodumov,3 M. McCleskey,1..., the energy of the incident ion at the moment of the interaction is not fixed *Corresponding author: goldberg@comp.tamu.edu by the experimental conditions. Therefore it is impossible to interpret the spectra (i.e., to reconstruct the kinematics) without...

Fu, Changbo; Goldberg, V. Z.; Mukhamedzhanov, A. M.; Chubarian, G. G.; Rogachev, G. V.; Skorodumov, B.; McCleskey, M.; Zhai, Y.; Al-Abdullah, T.; Tabacaru, G.; Trache, L.; Tribble, Robert E.

2007-01-01T23:59:59.000Z

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


21

Investigating fusion plasma instabilities in the Mega Amp Spherical Tokamak using mega electron volt proton emissions (invited)  

SciTech Connect (OSTI)

The proton detector (PD) measures 3 MeV proton yield distributions from deuterium-deuterium fusion reactions within the Mega Amp Spherical Tokamak (MAST). The PDs compact four-channel system of collimated and individually oriented silicon detectors probes different regions of the plasma, detecting protons (with gyro radii large enough to be unconfined) leaving the plasma on curved trajectories during neutral beam injection. From first PD data obtained during plasma operation in 2013, proton production rates (up to several hundred kHz and 1 ms time resolution) during sawtooth events were compared to the corresponding MAST neutron camera data. Fitted proton emission profiles in the poloidal plane demonstrate the capabilities of this new system.

Perez, R. V., E-mail: rvale006@fiu.edu; Boeglin, W. U.; Angulo, A.; Avila, P.; Leon, O.; Lopez, C. [Department of Physics, Florida International University, 11200 SW 8 ST, CP204, Miami, Florida 33199 (United States); Darrow, D. S. [Princeton Plasma Physics Laboratory, James Forrestal Campus, P.O. Box 451, Princeton, New Jersey 08543 (United States); Cecconello, M.; Klimek, I. [Department of Physics and Astronomy, Uppsala University, Uppsala SE-751 20 (Sweden); Allan, S. Y.; Akers, R. J.; Keeling, D. L.; McClements, K. G.; Scannell, R.; Conway, N. J. [CCFE, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB (United Kingdom); Turnyanskiy, M. [ITER Physics Department, EFDA CSU Garching, Boltzmannstrasse 2, D-85748, Garching (Germany); Jones, O. M. [CCFE, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB (United Kingdom); Department of Physics, Durham University, Durham DH1 3LE (United Kingdom); Michael, C. A. [Australian National University, Canberra ACT 0200 (Australia)

2014-11-15T23:59:59.000Z

22

Green Bank Telescope Studies of Giant Pulses from Millisecond Pulsars  

E-Print Network [OSTI]

We have conducted a search for giant pulses from four millisecond pulsars using the 100m Green Bank Telescope. Coherently dedispersed time-series from PSR J0218+4232 were found to contain giant pulses of very short intrinsic duration whose energies follow power-law statistics. The giant pulses are in phase with the two minima of the radio integrated pulse profile but are phase aligned with the peaks of the X-ray profile. Historically, individual pulses more than 10-20 times the mean pulse energy have been deemed to be ``giant pulses''. As only 4 of the 155 pulses had energies greater than 10 times the mean pulse-energy, we argue the emission mechanism responsible for giant pulses should instead be defined through: (a) intrinsic timescales of microsecond or nanosecond duration; (b) power-law energy statistics; and (c) emission occurring in narrow phase-windows coincident with the phase windows of non-thermal X-ray emission. Four short-duration pulses with giant-pulse characteristics were also observed from PSR B1957+20. As the inferred magnetic fields at the light cylinders of the millisecond pulsars that emit giant pulses are all very high, this parameter has previously been considered to be an indicator of giant pulse emissivity. However, the frequency of giant pulse emission from PSR~B1957+20 is significantly lower than for other millisecond pulsars that have similar magnetic fields at their light cylinders. This suggests that the inferred magnetic field at the light cylinder is a poor indicator of the rate of emission of giant pulses.

H. S. Knight; M. Bailes; R. N. Manchester; S. M. Ord; B. A. Jacoby

2005-12-13T23:59:59.000Z

23

Assessment of the use of prompt gamma emission for proton therapy range verification  

E-Print Network [OSTI]

PURPOSE: Prompt gamma rays emitted from proton-nucleus interactions in tissue present a promising non-invasive, in situ means of monitoring proton beam based radiotherapy. This study investigates the fluence and energy ...

Styczynski, John R

2009-01-01T23:59:59.000Z

24

Decay of C-10 excited states above the 2p+2 alpha threshold and the contribution from "democratic" two-proton emission  

E-Print Network [OSTI]

. These include states at 5.18 and 6.54 MeV which decay by sequential two-proton emission through the long-lived ground state of B-9. In addition, states at 5.3 and 6.57 MeV were found in which there is no long-lived intermediate state between the two proton...

Charity, R. J.; Mercurio, K.; Sobotka, L. G.; Elson, J. M.; Famiano, M.; Banu, A.; Fu, C.; Trache, L.; Tribble, Robert E.

2007-01-01T23:59:59.000Z

25

DETECTION AND FLUX DENSITY MEASUREMENTS OF THE MILLISECOND PULSAR J21450750 BELOW 100 MHz  

SciTech Connect (OSTI)

We present flux density measurements and pulse profiles for the millisecond pulsar PSR J21450750 spanning 37 to 81 MHz using data obtained from the first station of the Long Wavelength Array. These measurements represent the lowest frequency detection of pulsed emission from a millisecond pulsar to date. We find that the pulse profile is similar to that observed at 102 MHz. We also find that the flux density spectrum between ?40 MHz to 5 GHz is suggestive of a break and may be better fit by a model that includes spectral curvature with a rollover around 730 MHz rather than a single power law.

Dowell, J.; Taylor, G. B.; Craig, J.; Henning, P. A.; Schinzel, F. [Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131 (United States)] [Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131 (United States); Ray, P. S. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)] [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); Blythe, J. N. [School of Physics, Georgia Institute of Technology, Atlanta, GA 3033 (United States)] [School of Physics, Georgia Institute of Technology, Atlanta, GA 3033 (United States); Clarke, T.; Helmboldt, J. F. [U.S. Naval Research Laboratory, Washington, DC 20375 (United States)] [U.S. Naval Research Laboratory, Washington, DC 20375 (United States); Ellingson, S. W.; Wolfe, C. N. [Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061 (United States)] [Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061 (United States); Lazio, T. J. W. [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States)] [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States); Stovall, K., E-mail: jdowell@unm.edu [Center for Gravitational Wave Astronomy and Department of Physics and Astronomy, University of Texas at Brownsville, Brownsville, TX 78520 (United States)

2013-09-20T23:59:59.000Z

26

Origins of PM10 determined by the micro-proton induced X-ray emission spectra of single aerosol particles  

SciTech Connect (OSTI)

The micro-proton induced X-ray emission (micro-PIXE) spectrum of a single aerosol particle (SAP) was considered as its fingerprint for tracing its origin. A proton microprobe was used to extract fingerprints of SAPs. Environmental monitoring samples of PM10 were collected from a heavy industrial area of Shanghai and were analyzed by proton microprobe for finding their pollution sources. In order to find the sources of SAPs collected from environmental monitoring sites, a fingerprint database of SAPS collected from various pollution Sources was established. The origins of samples collected through environmental monitoring were identified by comparison of the micro-PIXE spectra of SAPs with those of SAPs in the fingerprint database using a pattern recognition technique. The results of this study show that most of the measured PM10 is derived from metallurgic industry, soil dust, coal combustion, automobile exhaust, and motorcycle exhaust. The study also shows that the proton microprobe is an ideal tool for the analysis of SAPs. The unidentified particles of PM10 are classified into seven classes by hierarchical cluster analysis based on the element peak intensity in the spectra.

Yue, W.S.; Li, X.L.; Wan, T.M.; Liu, J.F.; Zhang, G.L.; Li, Y. [Chinese Academy of Science, Shanghai (China). Shanghai Institute of Applied Physics

2006-06-15T23:59:59.000Z

27

Energy deposition spectra of simultaneous electron emissions from low energy protons  

E-Print Network [OSTI]

track is more complicated than the normal LET/RBE relationship. Recent measurements of atomic cross-section indicate that interactions of low energy protons with target atoms sometimes produce two or more electrons simultaneously. However, these cross...

DePriest, Kendall Russell

1998-01-01T23:59:59.000Z

28

BETA-DELAYED PROTON EMISSION IN NEUTRON-DEFICIENT LRNTHANIDE ISOTOPES  

E-Print Network [OSTI]

J.C. Hardy and E. Hubert. "Beta-delayed Proton astd Alphahalf-lives from (a) the grou theory of beta decay and (b)from Nilsson/RPA beta-strength function calculations for the

Witmarth, P.A.

2010-01-01T23:59:59.000Z

29

Proton emission imaging of the nuclear burn in inertial confinement fusion experiments  

E-Print Network [OSTI]

A proton core imaging system has been developed and extensively used for measuring the nuclear burn regions of inertial confinement fusion implosions. These imaging cameras, mounted to the 60-beam OMEGA laser facility, use ...

DeCiantis, Joseph Loreto

2005-01-01T23:59:59.000Z

30

Beta delayed emission of a proton by a one-neutron halo nucleus  

E-Print Network [OSTI]

Some one-neutron halo nuclei can emit a proton in a beta decay of the halo neutron. The branching ratio towards this rare decay mode is calculated within a two-body potential model of the initial core+neutron bound state and final core+proton scattering states. The decay probability per second is evaluated for the $^{11}$Be, $^{19}$C and $^{31}$Ne one-neutron halo nuclei. It is very sensitive to the neutron separation energy.

D. Baye; E. M. Tursunov

2010-12-28T23:59:59.000Z

31

Beta delayed emission of a proton by a one-neutron halo nucleus  

E-Print Network [OSTI]

Some one-neutron halo nuclei can emit a proton in a beta decay of the halo neutron. The branching ratio towards this rare decay mode is calculated within a two-body potential model of the initial core+neutron bound state and final core+proton scattering states. The decay probability per second is evaluated for the $^{11}$Be, $^{19}$C and $^{31}$Ne one-neutron halo nuclei. It is very sensitive to the neutron separation energy.

Baye, D

2010-01-01T23:59:59.000Z

32

Quark cluster contribution to cumulative proton emission in fragmentation of carbon ions  

E-Print Network [OSTI]

In the FRAGM experiment at heavy ion accelerator complex TWAC-ITEP, the proton yields at an angle 3.5$^\\circ$ have been measured at fragmentation of carbon ions at $T_0 = $ 0.6, 0.95 and 2.0 GeV/nucleon on beryllium target. The data are presented as invariant proton yields on cumulative variable $x$ in the range 0.9 carbon nuclei are estimated to be 8--12% for six-quark clusters and 0.2--0.6% for nine-quark clusters.

B. M. Abramov; P. N. Alekseev; Yu. A. Borodin; S. A. Bulychjov; I. A. Dukhovskoy; A. I. Khanov; A. P. Krutenkova; V. V. Kulikov; M. A. Martemyanov; M. A. Matsyuk; E. N. Turdakina

2013-10-23T23:59:59.000Z

33

Possible Proton Synchrotron Origin of X-Ray & Gamma Ray Emission in Large Scale Jet of 3C 273  

E-Print Network [OSTI]

The large scale jet of quasar 3C 273 has been observed in radio to $\\gamma$ ray frequencies. Earlier the X-ray emission from knot A of this jet has been explained with inverse Compton scattering of the cosmic microwave background radiations by the shock accelerated relativistic electrons in the jet. More recently it has been shown that this mechanism overproduces the gamma ray flux at GeV energy and violates the observational results from Fermi LAT. We have considered the synchrotron emission from a broken power law spectrum of accelerated protons in the jet to explain the observed X-ray to $\\gamma$ ray flux from knot A. The two scenarios discussed in our work are (i) magnetic field is high, synchrotron energy loss time of the protons is shorter than their escape time from the knot region and the age of the jet (ii) their escape time is shorter than their synchrotron energy loss time and the age of the jet. These scenarios can explain the observed photon spectrum well for moderate values of Doppler factor. The required jet luminosity is high $\\sim 10^{46}$ erg/sec in the first scenario and moderate $\\sim 10^{45}$ erg/sec in the second, which makes the second scenario more favorable.

Esha Kundu; Nayantara Gupta

2014-06-23T23:59:59.000Z

34

NEUTRAL PION EMISSION FROM ACCELERATED PROTONS IN THE SUPERNOVA REMNANT W44  

SciTech Connect (OSTI)

We present the AGILE gamma-ray observations in the energy range 50 MeV-10 GeV of the supernova remnant (SNR) W44, one of the most interesting systems for studying cosmic-ray production. W44 is an intermediate-age SNR ({approx}20, 000 years) and its ejecta expand in a dense medium as shown by a prominent radio shell, nearby molecular clouds, and bright [S II] emitting regions. We extend our gamma-ray analysis to energies substantially lower than previous measurements which could not conclusively establish the nature of the radiation. We find that gamma-ray emission matches remarkably well both the position and shape of the inner SNR shocked plasma. Furthermore, the gamma-ray spectrum shows a prominent peak near 1 GeV with a clear decrement at energies below a few hundreds of MeV as expected from neutral pion decay. Here we demonstrate that (1) hadron-dominated models are consistent with all W44 multiwavelength constraints derived from radio, optical, X-ray, and gamma-ray observations; (2) ad hoc lepton-dominated models fail to explain simultaneously the well-constrained gamma-ray and radio spectra, and require a circumstellar density much larger than the value derived from observations; and (3) the hadron energy spectrum is well described by a power law (with index s = 3.0 {+-} 0.1) and a low-energy cut-off at E{sub c} = 6 {+-} 1 GeV. Direct evidence for pion emission is then established in an SNR for the first time.

Giuliani, A.; Caraveo, P.; Chen, A.; Contessi, T. [INAF-IASF Milano, via E. Bassini 15, 20133 Milano (Italy); Cardillo, M.; Tavani, M.; Costa, E.; Monte, E. Del; Donnarumma, I.; Evangelista, Y.; Feroci, M. [INAF/IASF-Roma,via Del Fosso del Cavaliere 100, 00133 Roma (Italy); Fukui, Y.; Yoshiike, S.; Torii, K. [Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464-8602 (Japan); Dubner, G.; Castelletti, G. [Instituto de Astronomia y Fisica del Espacio (IAFE, CONICET-UBA), 1428 Buenos Aires (Argentina); Barbiellini, G. [Dipartimento di Fisica and INFN, Via Valerio 2, I-34127 Trieste (Italy); Bulgarelli, A.; Gianotti, F. [INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna (Italy); Cattaneo, P. W. [INFN-Pavia, Via Bassi 6, I-27100 Pavia (Italy); and others

2011-12-15T23:59:59.000Z

35

E-Print Network 3.0 - accretion-powered millisecond x-ray Sample...  

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

accretion- powered millisecond pulsars and oscillations from thermonuclear X-ray... bursts. 2.1 Accretion-powered millisecond pulsars Although as early as 1996 the discovery of...

36

Semiclassical Distorted Wave Model Analysis of Backward Proton Emission from $(p,p^{\\prime}x)$ Reactions at Intermediate Energies  

E-Print Network [OSTI]

A semiclassical distorted wave (SCDW) model with Wigner transform of one-body density matrix is presented for multistep direct $(p,p^{\\prime}x)$ reactions to the continuum. The model uses Wigner distribution functions obtained in methods which include nucleon-nucleon correlations to a different extent, as well as Woods-Saxon (WS) single-particle wave function. The higher momentum components of target nucleons that play a crucial role in reproducing the high-energy part of the backward proton spectra are properly taken into account. This SCDW model is applied to analyses of multistep direct processes in $^{12}$C$(p,p^{\\prime}x)$, $^{40}$Ca$(p,p^{\\prime}x)$ and $^{90}$Zr$(p,p^{\\prime}x)$ in the incident energy range of 150--392 MeV. The double differential cross sections are calculated up to three-step processes. The calculated angular distributions are in good agreement with the experimental data, in particular at backward angles where the previous SCDW calculations with the WS single-particle wave function showed large underestimation. It is found that the result with the Wigner distribution function based on the coherent density fluctuation model provides overall better agreement with the experimental data over the whole emission energies.

M. K. Gaidarov; Y. Watanabe; K. Ogata; M. Kohno; M. Kawai; A. N. Antonov

2003-07-28T23:59:59.000Z

37

Light curves and polarization of accretion- and nuclear-powered millisecond pulsars  

E-Print Network [OSTI]

We study theoretical X-ray light curves and polarization properties of accretion-powered millisecond pulsars. We assume that the radiation is produced in two antipodal spots at the neutron star surface which are associated with the magnetic poles. We compute the angle-dependent intensity and polarization produced in an electron-scattering dominated plane-parallel accretion shock in the frame of the shock. The observed flux, polarization degree and polarization angle are calculated accounting for special and general relativistic effects. The calculations also extended to the case of nuclear-powered millisecond pulsars -- X-ray bursts. In this case, we consider one spot and the radiation is assumed to be produced in the atmosphere of the infinite Thomson optical depth. The light curves and polarization profiles show a large diversity depending on the model parameters. Presented results can be used as a first step to understand the observed pulse profiles of accretion- and nuclear-powered millisecond pulsars. Future observations of the X-ray polarization will provide a valuable tool to test the geometry of the emission region and its physical characteristics.

Kerttu Viironen; Juri Poutanen

2004-08-13T23:59:59.000Z

38

The Millisecond Magnetar Central Engine in short GRBs  

E-Print Network [OSTI]

One favored progenitor model for short duration gamma-ray bursts (SGRBs) is the coalescence of two neutron stars (NS-NS). One possible outcome of such a merger would be a rapidly spinning, strongly magnetized neutron star (known as a millisecond magnetar). These magnetars may be "supra-massive", implying they would collapse to black holes after losing centrifugal support due to magnetic dipole spindown. By systematically analyzing the BAT-XRT light curves of all short GRBs detected by {\\em swift}, we test how well the data are consistent with this central engine model of short GRBs. We find that the so-called "extended emission" observed with BAT in some short GRBs are fundamentally the same component as the "internal X-ray plateau" as observed in many short GRBs, which is defined as a plateau in the lightcurve followed by a very rapid drop. Based on how likely a short GRB hosts a magnetar, we characterize the entire {\\em Swift} short GRB sample into three categories: the "internal plateau" sample, the "exter...

L, Hou-Jun; Lei, Wei-Hua; Li, Ye; Lasky, Paul D

2015-01-01T23:59:59.000Z

39

E-Print Network 3.0 - accreting milli-second x-ray Sample Search...  

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

milli-second x-ray Search Powered by Explorit Topic List Advanced Search Sample search results for: accreting milli-second x-ray Page: << < 1 2 3 4 5 > >> 1 X-rays from classical T...

40

Unique decay process: {beta}-delayed emission of a proton and a neutron by the {sup 11}Li halo nucleus  

SciTech Connect (OSTI)

The neutron-rich {sup 11}Li halo nucleus is unique among nuclei with known separation energies in its ability to emit a proton and a neutron in a {beta}-decay process. The branching ratio toward this rare decay mode is evaluated within a three-body model for the initial bound state and with Coulomb three-body final scattering states. The branching ratio should be comprised between two extreme cases, i.e., a lower bound 6x10{sup -12} obtained with a pure Coulomb wave and an upper bound 5x10{sup -10} obtained with a plane wave. A simple model with modified Coulomb waves provides plausible values between 0.8x10{sup -10} and 2.2x10{sup -10}, with most probable total energies of the proton and neutron between 0.15 and 0.3 MeV.

Baye, D.; Descouvemont, P.; Tursunov, E. M. [Physique Quantique, CP 165/82, and Physique Nucleaire Theorique et Physique Mathematique, CP 229, Universite Libre de Bruxelles (ULB), B-1050 Brussels (Belgium); Institute of Nuclear Physics, Uzbekistan Academy of Sciences, 100214, Ulugbek, Tashkent (Uzbekistan)

2010-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

A unique decay process: beta delayed emission of a proton and a neutron by the $^{11}$Li halo nucleus  

E-Print Network [OSTI]

The neutron-rich $^{11}$Li halo nucleus is unique among nuclei with known separation energies by its ability to emit a proton and a neutron in a $\\beta$ decay process. The branching ratio towards this rare decay mode is evaluated within a three-body model for the initial bound state and with Coulomb three-body final scattering states. The branching ratio should be comprised between two extreme cases, i.e.\\ a lower bound $6 \\times 10^{-12}$ obtained with a pure Coulomb wave and an upper bound $5 \\times 10^{-10}$ obtained with a plane wave. A simple model with modified Coulomb waves provides plausible values between between $0.8 \\times 10^{-10}$ and $2.2 \\times 10^{-10}$ with most probable total energies of the proton and neutron between 0.15 and 0.3 MeV.

Baye, D; Tursunov, E M

2010-01-01T23:59:59.000Z

42

A unique decay process: beta delayed emission of a proton and a neutron by the $^{11}$Li halo nucleus  

E-Print Network [OSTI]

The neutron-rich $^{11}$Li halo nucleus is unique among nuclei with known separation energies by its ability to emit a proton and a neutron in a $\\beta$ decay process. The branching ratio towards this rare decay mode is evaluated within a three-body model for the initial bound state and with Coulomb three-body final scattering states. The branching ratio should be comprised between two extreme cases, i.e.\\ a lower bound $6 \\times 10^{-12}$ obtained with a pure Coulomb wave and an upper bound $5 \\times 10^{-10}$ obtained with a plane wave. A simple model with modified Coulomb waves provides plausible values between between $0.8 \\times 10^{-10}$ and $2.2 \\times 10^{-10}$ with most probable total energies of the proton and neutron between 0.15 and 0.3 MeV.

D. Baye; P. Descouvemont; E. M. Tursunov

2010-12-28T23:59:59.000Z

43

Assessing Millisecond Proto-Magnetars as GRB Central Engines  

E-Print Network [OSTI]

Magnetars are a sizable subclass of the neutron star census. Their very high magnetic field strengths are thought to be a consequence of rapid (millisecond) rotation at birth in a successful core-collapse supernova. In their first tens of seconds of existence, magnetars transition from hot, extended ``proto-''magnetars to the cooled and magnetically-dominated objects we identify $\\sim10^4$ years later as Soft Gamma-ray Repeaters (SGRs) and Anamolous X-ray Pulsars (AXPs). Millisecond proto-magnetar winds during this cooling phase likewise transition from non-relativistic and thermally-driven to magneto-centrifugally-driven, and finally to relativistic and Poynting-flux dominated. Here we review the basic considerations associated with that transition. In particular, we discuss the spindown of millisecond proto-magnetars throughout the Kelvin-Helmholtz cooling epoch. Because of their large reservoir of rotational energy, their association with supernovae, and the fact that their winds are expected to become highly relativistic in the seconds after their birth, proto-magnetars have been suggested as the central engine of long-duration gamma ray bursts. We discuss some of the issues and outstanding questions in assessing them as such.

Todd A. Thompson

2006-11-12T23:59:59.000Z

44

Proton emission from cone-in-shell fast-ignition experiments at Omega N. Sinenian, W. Theobald, J. A. Frenje, C. Stoeckl, F. H. Sguin et al.  

E-Print Network [OSTI]

for Laser Energetics, Rochester, New York 14623, USA 3 General Atomics, San Diego, California 92186, USA of energetic protons from cone-in-shell fast-igniton implosions at Omega have been conducted ) of energetic protons (7.5 MeV max.), indicating the presence of strong electric fields. These energetic protons

45

Extension of the T{sub z} = {minus}3/2, A = 4n + 1 series of beta-delayed proton emitters to {sup 65}Se and {sup 73}Sr, and low energy beta-delayed proton emission from the T{sub z} = {minus}3/2, A = 4n + 3 nucleus {sup 23}Al  

SciTech Connect (OSTI)

The series of known Tz = {minus}3/2, A = 4n + 1 nuclei has been extended to include the previously undiscovered isotopes {sup 65}Se and {sup 73}Sr, through the observation of beta-delayed proton emission via the isobaric analog state (IAS) of the beta-daughter (emitter). Due to the relatively large proton energies involved, these experiments were conducted using standard Si-Si {Delta}E-E telescopes. Beta-delayed protons arising from {sup 65}Se have been observed at an energy (laboratory) of 3.55 {plus_minus} 0.03 MeV, corresponding to the decay of the T = 3/2 isobaric analog state in {sup 65}As to the ground state of {sup 64}Ge. Similarly, beta-delayed protons from {sup 73}Sr at an energy of 3.75 {plus_minus} 0.04 MeV have been observed, corresponding to decay of the T = 3/2 isobaric analog state in {sup 73}Rb to the ground state of {sup 72}Kr. From the energies of these proton transitions, an improved prediction of the mass excesses of the two parent nuclei ({sup 65}Se and {sup 73}Sr) is made through the use of a Coulomb displacement formula. These predictions are {minus}33.41 {plus_minus} 0.26 and {minus}31.87 {plus_minus} 0.24 MeV for {sup 65}Se and {sup 73}Sr, respectively. Studies of low energy (down to {approximately}200 keV) beta-delayed protons from {sup 23}Al necessitated that a particle identification telescope with a low energy threshold for observation and identification of protons be developed. {sup 23}Al is of interest because of its role in the breakout of the hot CNO cycle leading to the astrophysical rp process.

Batchelder, J.C.

1993-12-01T23:59:59.000Z

46

Far-Infrared ISO Limits on Dust Disks around Millisecond Pulsars  

E-Print Network [OSTI]

We report 60 and 90 micron observations of 7 millisecond pulsars with the ISOPHOT instrument and describe our analysis procedures. No pulsars were detected, and typical (3\\sigma) upper limits are 150 mJy. We combine our results with others in the literature and use them to place constraints on the existence of protoplanetary or dust disks around millisecond pulsars.

T. J. W. Lazio; J. Fischer; R. S. Foster

2001-09-26T23:59:59.000Z

47

Pulsed Gamma-Rays From the Millisecond Pulsar J0030+0451 with the Fermi Large Area Telescope  

SciTech Connect (OSTI)

We report the discovery of gamma-ray pulsations from the nearby isolated millisecond pulsar PSR J0030+0451 with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). This discovery makes PSR J0030+0451 the second millisecond pulsar to be detected in gamma-rays after PSR J0218+4232, observed by the EGRET instrument on the Compton Gamma Ray Observatory. The spin-down power {dot E} = 3.5 x 10{sup 33} ergs s{sup -1} is an order of magnitude lower than the empirical lower bound of previously known gamma-ray pulsars. The emission profile is characterized by two narrow peaks, respectively 0.07 {+-} 0.01 and 0.08 {+-} 0.02 wide, separated by 0.44 {+-} 0.02 in phase. The first gamma-ray peak falls 0.15 {+-} 0.01 after the main radio peak. The pulse shape is similar to that of the 'normal' gamma-ray pulsars. An exponentially cut-off power-law fit of the emission spectrum leads to an integral photon flux above 100 MeV of (6.76 {+-} 1.05 {+-} 1.35) x 10{sup -8} cm{sup -2} s{sup -1} with cut-off energy (1.7 {+-} 0.4 {+-} 0.5) GeV. Based on its parallax distance of (300 {+-} 90) pc, we obtain a gamma-ray efficiency L{sub {gamma}}/{dot E} {approx_equal} 15% for the conversion of spin-down energy rate into gamma-ray radiation, assuming isotropic emission.

Abdo, Aous A.; /Naval Research Lab, Wash., D.C.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M. /Stockholm U., OKC /Stockholm U.; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, Guido; /INFN, Trieste /Trieste U.; Bastieri, Denis; /INFN, Padua /Padua U.; Battelino, M.; /Stockholm U., OKC /Royal Inst. Tech., Stockholm; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, Elliott D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari; Bruel, P.; /Ecole Polytechnique; Burnett, Thompson H.; /Washington U., Seattle /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /IASF, Milan /DAPNIA, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /George Mason U. /Naval Research Lab, Wash., D.C. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /LPCE, Orleans /Montpellier U. /Sonoma State U. /Stockholm U., OKC /Royal Inst. Tech., Stockholm /Stockholm U. /ASDC, Frascati /Naval Research Lab, Wash., D.C. /INFN, Trieste /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /UC, Santa Cruz /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /CENBG, Gradignan /CENBG, Gradignan /Montpellier U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Trieste /Hiroshima U.; /more authors..

2011-11-17T23:59:59.000Z

48

Exploring the intrabinary shock from the redback millisecond pulsar PSR J2129-0429  

E-Print Network [OSTI]

We have investigated the intrabinary shock emission from the redback millisecond pulsar PSR J2129-0429 with XMM-Newton and Fermi. Orbital modulation in X-ray and UV can be clearly seen. Its X-ray modulation has a double-peak structure with a dip in between. The observed X-rays are non-thermal dominant which can be modeled by a power-law with a photon index of ~1.2. Intrabinary shock can be the origin of the observed X-rays. The UV light curve is resulted from the ellipsoidal modulation of the companion. Modeling the UV light curve prefers a large viewing angle. The heating effect of the UV light curve is found to be negligible which suggests the high energy radiation beam of PSR J2129-0429 does not direct toward its companion. On the other hand, no significant orbital modulation can be found in gamma-ray which suggests the majority of the gamma-rays come from the pulsar.

Hui, C Y; Park, S M; Takata, J; Li, K L; Tam, P H T; Lin, L C C; Kong, A K H; Cheng, K S; Kim, Chunglee

2015-01-01T23:59:59.000Z

49

RADIO DETECTION OF THE FERMI-LAT BLIND SEARCH MILLISECOND PULSAR J1311-3430  

SciTech Connect (OSTI)

We report the detection of radio emission from PSR J1311-3430, the first millisecond pulsar (MSP) discovered in a blind search of Fermi Large Area Telescope (LAT) gamma-ray data. We detected radio pulsations at 2 GHz, visible for <10% of {approx}4.5 hr of observations using the Green Bank Telescope (GBT). Observations at 5 GHz with the GBT and at several lower frequencies with Parkes, Nancay, and the Giant Metrewave Radio Telescope resulted in non-detections. We also report the faint detection of a steep spectrum continuum radio source (0.1 mJy at 5 GHz) in interferometric imaging observations with the Jansky Very Large Array. These detections demonstrate that PSR J1311-3430 is not radio quiet and provide additional evidence that radio-quiet MSPs are rare. The radio dispersion measure of 37.8 pc cm{sup -3} provides a distance estimate of 1.4 kpc for the system, yielding a gamma-ray efficiency of 30%, typical of LAT-detected MSPs. We see apparent excess delay in the radio pulses as the pulsar appears from eclipse and we speculate on possible mechanisms for the non-detections of the pulse at other orbital phases and observing frequencies.

Ray, P. S.; Wood, K. S. [Space Science Division, Naval Research Laboratory, Washington, DC 20375-5352 (United States); Ransom, S. M. [National Radio Astronomy Observatory (NRAO), Charlottesville, VA 22903 (United States); Cheung, C. C. [National Academy of Sciences, Washington, DC 20001 (United States); Giroletti, M. [INAF Istituto di Radioastronomia, I-40129 Bologna (Italy); Cognard, I. [Laboratoire de Physique et Chimie de l'Environnement, LPCE UMR 6115 CNRS, F-45071 Orleans Cedex 02 (France); Camilo, F. [Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States); Bhattacharyya, B. [Inter-University Centre for Astronomy and Astrophysics, Pune 411 007 (India); Roy, J. [National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411 007 (India); Romani, R. W.; Kerr, M. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Ferrara, E. C. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Guillemot, L.; Kramer, M. [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, D-53121 Bonn (Germany); Johnston, S.; Keith, M. [CSIRO Astronomy and Space Science, Australia Telescope National Facility, Epping NSW 1710 (Australia); Pletsch, H. J. [Max-Planck-Institut fuer Gravitationsphysik, Albert-Einstein-Institut, D-30167 Hannover (Germany); Saz Parkinson, P. M., E-mail: Paul.Ray@nrl.navy.mil [Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)

2013-01-20T23:59:59.000Z

50

E-Print Network 3.0 - accreting millisecond x-ray Sample Search...  

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

of Technology (MIT) Collection: Physics 16 SEARCHING FOR MILLISECOND PULSARS IN GAMMA-RAY DATA USING THE FERMI LAT Summary: production is less limited (Lyne and Graham-Smith...

51

No Evidence for Coherent Diffractive Radiation Patterns in the Millisecond Pulsar PSR J0437-4715  

E-Print Network [OSTI]

An independent analysis of the 326.5 MHz data obtained by Ooty Radio Telescope reveals no evidence for coherent diffractive radiation patterns in the millisecond pulsar PSR J0437-4715.

M. Vivekanand

2001-05-28T23:59:59.000Z

52

MODELING PHASE-ALIGNED GAMMA-RAY AND RADIO MILLISECOND PULSAR LIGHT CURVES  

SciTech Connect (OSTI)

Since the discovery of the first eight gamma-ray millisecond pulsars (MSPs) by the Fermi Large Area Telescope, this population has been steadily expanding. Four of the more recent detections, PSR J0034-0534, PSR J1939+2134 (B1937+21; the first MSP ever discovered), PSR J1959+2048 (B1957+20; the first discovery of a black widow system), and PSR J2214+3000, exhibit a phenomenon not present in the original discoveries: nearly phase-aligned radio and gamma-ray light curves (LCs). To account for the phase alignment, we explore models where both the radio and gamma-ray emission originate either in the outer magnetosphere near the light cylinder or near the polar caps. Using a Markov Chain Monte Carlo technique to search for best-fit model parameters, we obtain reasonable LC fits for the first three of these MSPs in the context of 'altitude-limited' outer gap (alOG) and two-pole caustic (alTPC) geometries (for both gamma-ray and radio emission). These models differ from the standard outer gap (OG)/two-pole caustic (TPC) models in two respects: the radio emission originates in caustics at relatively high altitudes compared to the usual conal radio beams, and we allow both the minimum and maximum altitudes of the gamma-ray and radio emission regions to vary within a limited range (excluding the minimum gamma-ray altitude of the alTPC model, which is kept constant at the stellar radius, and that of the alOG model, which is set to the position-dependent null charge surface altitude). Alternatively, phase-aligned solutions also exist for emission originating near the stellar surface in a slot gap scenario ('low-altitude slot gap' (laSG) models). We find that the alTPC models provide slightly better LC fits than the alOG models, and both of these give better fits than the laSG models (for the limited range of parameters considered in the case of the laSG models). Thus, our fits imply that the phase-aligned LCs are likely of caustic origin, produced in the outer magnetosphere, and that the radio emission for these pulsars may come from close to the light cylinder. In addition, we were able to constrain the minimum and maximum emission altitudes with typical uncertainties of {approx}30% of the light cylinder radius. Our results therefore describe a third gamma-ray MSP subclass, in addition to the two previously found by Venter et al.: those with LCs fit by standard OG/TPC models and those with LCs fit by pair-starved polar cap models.

Venter, C. [Centre for Space Research, North-West University, Potchefstroom Campus, Potchefstroom 2520 (South Africa); Johnson, T. J.; Harding, A. K. [Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

2012-01-01T23:59:59.000Z

53

BRIGHT 'MERGER-NOVA' FROM THE REMNANT OF A NEUTRON STAR BINARY MERGER: A SIGNATURE OF A NEWLY BORN, MASSIVE, MILLISECOND MAGNETAR  

SciTech Connect (OSTI)

A massive millisecond magnetar may survive the merger of a neutron star (NS) binary, which would continuously power the merger ejecta. We develop a generic dynamic model for the merger ejecta with energy injection from the central magnetar. The ejecta emission (the {sup m}erger-nova{sup )} powered by the magnetar peaks in the UV band and the peak of the light curve, progressively shifts to an earlier epoch with increasing frequency. A magnetar-powered merger-nova could have an optical peak brightness comparable to a supernova, which is a few tens or hundreds times brighter than the radioactive-powered merger-novae (the so-called macro-nova or kilo-nova). On the other hand, such a merger-nova would peak earlier and have a significantly shorter duration than that of a supernova. An early collapse of the magnetar could suppress the brightness of the optical emission and shorten its duration. Such millisecond-magnetar-powered merger-novae may be detected from NS-NS merger events without an observed short gamma-ray burst, and could be a bright electromagnetic counterpart for gravitational wave bursts due to NS-NS mergers. If detected, it suggests that the merger leaves behind a massive NS, which has important implications for the equation-of-state of nuclear matter.

Yu, Yun-Wei [Institute of Astrophysics, Central China Normal University, Wuhan 430079 (China)] [Institute of Astrophysics, Central China Normal University, Wuhan 430079 (China); Zhang, Bing; Gao, He, E-mail: yuyw@mail.ccnu.edu.cn, E-mail: zhang@physics.unlv.edu [Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154 (United States)] [Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154 (United States)

2013-10-20T23:59:59.000Z

54

accreting millisecond pulsars: Topics by E-print Network  

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

pulsars formed by accretion induced collapse can be a source of cosmological gamma-ray bursts. We find that relativistic beaming of gamma-ray emission and precession of...

55

accreting millisecond pulsar: Topics by E-print Network  

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

pulsars formed by accretion induced collapse can be a source of cosmological gamma-ray bursts. We find that relativistic beaming of gamma-ray emission and precession of...

56

Evolution from Canonical to Millisecond Pulsar through the X-ray Accretion Stage  

E-Print Network [OSTI]

We model the evolution of canonical pulsars from the death line to millisecond pulsars through the X-ray neutron star stage of accretion from a low-mass companion. We trace this evolution in magnetic field strength starting at $B=10^{12}$ to $10^8$ G and in period of about 1 s to milliseconds. Important factors are accretion rate and the decay rate of the magnetic field. A broad swathe is traced in the $B-P$ plane according to the value of these factors, which represent different conditions of the binary pair. An important ingredient is the dependence of the stellar moment of inertia on rotation frequency (time).

Norman K. Glendenning; Fridolin Weber

2000-10-17T23:59:59.000Z

57

XMM-Newton Data Processing for Faint Diffuse Emission: Proton Flares, Exposure Maps and Report on EPIC MOS1 Bright CCDs Contamination  

E-Print Network [OSTI]

We present a study of the in-flight performance of the XMM-Newton EPIC MOS and pn detectors, with focus on the influence of proton flares and vignetting on the data. The very wide range in the conditions of our sample of observations, in terms of exposure length and background intensities, allows the detection of a wide range in the spectra of the proton flares, in contrast to the hard-spectrum flares proposed by Lumb et al.(2002) or Read et al.(2003) We also find an up to now unreported contamination in the low energy regime (E<0.5 keV) of the MOS1 observations, consisting of a significant increase in the measured intensities in two CCDs at the edges of the detector. This contamination yields in "bright CCDs" in the observations. Its effect must be taken into account for the study of sources detected in the affected CCDs. With respect to vignetting, we present in-flight exposure maps and we propose a method to repeat this calculation for user-definable energy bands. All the results presented here, have the goal to enable the study of very faint extended sources with XMM-Newton, like nearby galactic X-ray halos or the soft X-ray background.

J. Pradas; J. Kerp

2005-08-04T23:59:59.000Z

58

Proton radioactivity half lives with Skyrme interactions  

E-Print Network [OSTI]

The potential barrier impeding the spontaneous emission of protons in the proton radioactive nuclei is calculated as the sum of nuclear, Coulomb and centrifugal contributions. The nuclear part of the proton-nucleus interaction potential is obtained in the energy density formalism using Skyrme effective interaction that results into a simple algebraic expression. The half-lives of the proton emitters are calculated for the different Skyrme sets within the improved WKB framework. The results are found to be in reasonable agreement with the earlier results obtained for more complicated calculations involving finite range interactions.

T. R. Routray; Abhishek Mishra; S. K. Tripathy; B. Behera; D. N. Basu

2012-05-31T23:59:59.000Z

59

Millisecond switching in solid state electrochromic polymer devices fabricated from ionic self-assembled multilayers  

E-Print Network [OSTI]

Millisecond switching in solid state electrochromic polymer devices fabricated from ionic self The electrochromic switching times of solid state conducting polymer devices fabricated by the ionic self shown to decrease with the active area of the electrochromic device suggesting that even faster

Heflin, Randy

60

Nuclear-Powered Millisecond Pulsars and the Maximum Spin Frequency of Neutron Stars  

E-Print Network [OSTI]

Millisecond pulsars are neutron stars (NSs) that are thought to have been spun-up by mass accretion from a stellar companion. It is unknown whether there is a natural brake for this process, or if it continues until the centrifugal breakup limit is reached at submillisecond periods. Many NSs that are accreting from a companion exhibit thermonuclear X-ray bursts that last tens of seconds, caused by unstable nuclear burning on their surfaces. Millisecond brightness oscillations during bursts from ten NSs (as distinct from other rapid X-ray variability that is also observed) are thought to measure the stellar spin, but direct proof of a rotational origin has been lacking. Here, we report the detection of burst oscillations at the known spin frequency of an accreting millisecond pulsar, and we show that these oscillations always have the same rotational phase. This firmly establishes burst oscillations as nuclear-powered pulsations tracing the spin of accreting NSs, corroborating earlier evidence. The distribution of spin frequencies of the 11 nuclear-powered pulsars cuts off well below the breakup frequency for most NS models, supporting theoretical predictions that gravitational radiation losses can limit accretion torques in spinning up millisecond pulsars.

Deepto Chakrabarty; Edward H. Morgan; Michael P. Muno; Duncan K. Galloway; Rudy Wijnands; Michiel van der Klis; Craig B. Markwardt

2003-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Swinging between rotation and accretion power in a millisecond binary pulsar  

E-Print Network [OSTI]

Radio pulsars are neutron stars that emit radiation modulated and powered by the rotation of their magnetic field, and which consequently decelerate (Pacini, 1967). The very fast millisecond spin periods measured in old radio pulsars (Backer et al. 1982) are thought to be the outcome of an earlier X-ray bright phase, during which the neutron star accretes matter and angular momentum from a low mass companion star in a binary system (Alpar et al. 1982; Radhakrishnan & Srinivasan 1982). This evolutionary scenario has been supported by the detection of X-ray millisecond pulsations from several accreting neutron stars in the past fifteen years (Wijnands & van der Klis 1998), as well as by the indirect evidence for the presence of a disk in the past around a millisecond radio pulsar now powered by rotation (Archibald et al. 2009). However, a transition between a rotation-powered and an accretion-powered state was never observed. Here we present the detection of millisecond X-ray pulsations from an accretin...

Papitto, A; Bozzo, E; Rea, N; Pavan, L; Campana, S; Romano, P; Burderi, L; Di Salvo, T; Riggio, A; Torres, D F; Falanga, M; Hessels, J W T; Burgay, M; Sarkissian, J M; Wieringa, M H; Filipovi?, M D; Wong, G F

2013-01-01T23:59:59.000Z

62

Testing the millisecond pulsar scenario of the Galactic center gamma-ray excess with very high energy gamma-rays  

E-Print Network [OSTI]

The recent analyses of the Fermi Large Area Telescope data show an extended GeV $\\gamma$-ray excess on top of the expected diffuse background in the Galactic center region, which can be explained with annihilating dark matter or a population of millisecond pulsars (MSPs). We propose to observe the very high energy $\\gamma$-rays for distinguishing the MSP scenario from the dark matter scenario. The GeV $\\gamma$-ray MSPs should release most energy to the relativistic $e^{\\pm}$ wind, which will diffuse in the Galaxy and radiate TeV $\\gamma$-rays through inverse Compton scattering and bremsstrahlung processes. By calculating the spectrum and spatial distribution, we show that such emission is detectable with the next generation very high energy $\\gamma$-ray observatory, the Cherenkov Telescope Array (CTA), under reasonable model parameters. It is essential to search for the multi-wavelength counterparts to the GeV $\\gamma$-ray excess for solving this mystery in the high energy universe.

Qiang Yuan; Kunihito Ioka

2015-02-09T23:59:59.000Z

63

FIVE NEW MILLISECOND PULSARS FROM A RADIO SURVEY OF 14 UNIDENTIFIED FERMI-LAT GAMMA-RAY SOURCES  

SciTech Connect (OSTI)

We have discovered five millisecond pulsars (MSPs) in a survey of 14 unidentified Fermi Large Area Telescope sources in the southern sky using the Parkes radio telescope. PSRs J0101-6422, J1514-4946, and J1902-5105 reside in binaries, while PSRs J1658-5324 and J1747-4036 are isolated. Using an ephemeris derived from timing observations of PSR J0101-6422 (P = 2.57 ms, DM = 12 pc cm{sup -3}), we have detected {gamma}-ray pulsations and measured its proper motion. Its {gamma}-ray spectrum (a power law of {Gamma} = 0.9 with a cutoff at 1.6 GeV) and efficiency are typical of other MSPs, but its radio and {gamma}-ray light curves challenge simple geometric models of emission. The high success rate of this survey-enabled by selecting {gamma}-ray sources based on their detailed spectral characteristics-and other similarly successful searches indicate that a substantial fraction of the local population of MSPs may soon be known.

Kerr, M. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Camilo, F. [Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States); Johnson, T. J. [National Academy of Sciences, Washington, DC 20001 (United States); Ferrara, E. C.; Harding, A. K. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Guillemot, L.; Kramer, M. [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, 53121 Bonn (Germany); Hessels, J. [Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA Dwingeloo (Netherlands); Johnston, S.; Keith, M.; Reynolds, J. E. [CSIRO Astronomy and Space Science, Australia Telescope National Facility, Epping, NSW 1710 (Australia); Ransom, S. M. [National Radio Astronomy Observatory (NRAO), Charlottesville, VA 22903 (United States); Ray, P. S.; Wood, K. S. [Space Science Division, Naval Research Laboratory, Washington, DC 20375-5352 (United States); Sarkissian, J., E-mail: kerrm@stanford.edu, E-mail: fernando@astro.columbia.edu, E-mail: tyrel.j.johnson@gmail.com [CSIRO Parkes Observatory, Parkes, NSW 2870 (Australia)

2012-03-20T23:59:59.000Z

64

Copper CMP Modeling: Millisecond Scale Adsorption Kinetics of BTA in Glycine-Containing Solutions at pH 4  

E-Print Network [OSTI]

Society H1153 Copper CMP Modeling: Millisecond Scaleon the surface of a micro-copper electrode in pH 4 aqueousa Cu?I?BTA monolayer on the copper surface. Based on these

Choi, Seungchoun; Tripathi, Shantanu; Dornfeld, David; Doyle, F M

2010-01-01T23:59:59.000Z

65

Time-resolved temperature measurement and numerical simulation of millisecond laser irradiated silicon  

SciTech Connect (OSTI)

Thermal process of 1064 nm millisecond pulsed Nd:YAG laser irradiated silicon was time-resolved temperature measured by an infrared radiation pyrometer, temperature evolutions of the spot center for wide range of laser energy densities were presented. The waveforms of temperature evolution curves contained much information about phase change, melting, solidification and vaporization. An axisymmetric numerical model was established for millisecond laser heating silicon. The transient temperature fields were obtained by using the finite element method. The numerical results of temperature evolutions of the spot center are in good agreement with the experimental results. Furthermore, the axial temperature distributions of the numerical results give a better understanding of the waveforms in the experimental results. The melting threshold, vaporizing threshold, melting duration, and melting depth were better identified by analyzing two kinds of results.

Li Zewen; Zhang Hongchao; Shen Zhonghua; Ni Xiaowu [School of Science, Nanjing University of Science and Technology, Nanjing 210094 (China)

2013-07-21T23:59:59.000Z

66

The Parkes multibeam pulsar survey: VII. Timing of four millisecond pulsars and the underlying spin period distribution of the Galactic millisecond pulsar population  

E-Print Network [OSTI]

We present timing observations of four millisecond pulsars discovered in the Parkes 20-cm multibeam pulsar survey of the Galactic plane. PSRs J1552-4937 and J1843-1448 are isolated objects with spin periods of 6.28 and 5.47 ms respectively. PSR J1727-2946 is in a 40-day binary orbit and has a spin period of 27 ms. The 4.43-ms pulsar J1813-2621 is in a circular 8.16-day binary orbit around a low-mass companion star with a minimum companion mass of 0.2 solar masses. Combining these results with detections from five other Parkes multibeam surveys, gives a well-defined sample of 56 pulsars with spin periods below 20 ms. We develop a likelihood analysis to constrain the functional form which best describes the underlying distribution of spin periods for millisecond pulsars. The best results were obtained with a log-normal distribution. A gamma distribution is less favoured, but still compatible with the observations. Uniform, power-law and Gaussian distributions are found to be inconsistent with the data. Galactic...

Lorimer, D R; Manchester, R N; Possenti, A; Lyne, A G; McLaughlin, M A; Kramer, M; Hobbs, G; Stairs, I H; Burgay, M; Eatough, R P; Keith, M J; Faulkner, A J; D'Amico, N; Camilo, F; Corongiu, A; Crawford, F

2015-01-01T23:59:59.000Z

67

A Tighter Constraint on post-Newtonian Gravity using Millisecond Pulsars  

E-Print Network [OSTI]

Some theories of gravity predict the existence of preferred-frame effects and violations of conservation of energy and momentum. General relativity predicts no such effects. In the parameterised post-Newtonian (PPN) formalism, the parameter, \\al3 $\\equiv 0$ if these effects do not exist. The period derivatives ($\\dot{P}$) of millisecond pulsars (MSPs) are used to more tightly constrain these effects by showing that $|$\\al3$|$ $< 5 \\times 10^{-16}$.

J. F. Bell

1995-08-08T23:59:59.000Z

68

Temporal variations in space-time and progenitors of gamma ray burst and millisecond pulsars  

E-Print Network [OSTI]

A time varying space-time metric is shown to be a source of electromagnetic radiation. The post-Newtonian approximation is used as a realistic model of the connection between the space-time metric and a time varying gravitational potential. Large temporal variations in the metric from the coalescence of colliding black holes and neutron stars are shown to be possible progenitors of gamma ray burst and millisecond pulsars.

Preston Jones

2007-08-31T23:59:59.000Z

69

Millisecond Kinetics of Nanocrystal Cation Exchange UsingMicrofluidic X-ray Absorption Spectroscopy  

SciTech Connect (OSTI)

We describe the use of a flow-focusing microfluidic reactorto measure the kinetics of theCdSe-to-Ag2Se nanocrystal cation exchangereaction using micro-X-ray absorption spectroscopy (mu XAS). The smallmicroreactor dimensions facilitate the millisecond mixing of CdSenanocrystal and Ag+ reactant solutions, and the transposition of thereaction time onto spatial coordinates enables the in situ observation ofthe millisecond reaction with mu XAS. XAS spectra show the progression ofCdSe nanocrystals to Ag2Se over the course of 100 ms without the presenceof long-lived intermediates. These results, along with supporting stoppedflow absorption experiments, suggest that this nanocrystal cationexchange reaction is highly efficient and provide insight into how thereaction progresses in individual particles. This experiment illustratesthe value and potential of in situ microfluidic X-ray synchrotrontechniques for detailed studies of the millisecond structuraltransformations of nanoparticles and other solution-phase reactions inwhich diffusive mixing initiates changes in local bond structures oroxidation states.

Chan, Emory M.; Marcus, Matthew A.; Fakra, Sirine; Elnaggar,Mariam S.; Mathies, Richard A.; Alivisatos, A. Paul

2007-05-07T23:59:59.000Z

70

Proton structure and tensor gluons  

E-Print Network [OSTI]

We consider a possibility that inside the proton and, more generally, inside the hadrons there are additional partons - tensor-gluons, which can carry a part of the proton momentum. The tensor-gluons have zero electric charge, like gluons, but have a larger spin. Inside the proton a nonzero density of the tensor-gluons can be generated by the emission of tensor-gluons by gluons. The last mechanism is typical for non-Abelian tensor gauge theories, in which there exists a gluon-tensor-tensor vertex of order g. Therefore the number of gluons changes not only because a quark may radiate a gluon or because a gluon may split into a quark-antiquark pair or into two gluons, but also because a gluon can split into two tensor-gluons. The process of gluon splitting suggests that part of the proton momentum which was carried by neutral partons is shared between vector and tensor gluons. We derive evolution equations for the parton distribution functions which take into account these new processes. The momentum sum rule allows to find the tensor-gluons contribution to the Callan-Simanzik beta function and to calculate the corresponding anomalous dimensions. This contribution changes the behavior of the structure functions, and the logarithmic correction to the Bjorken scaling becomes more mild. This also influences the unification scale at which the coupling constants of the Standard Model merge, shifting its value to lower energies of order of 40 TeV.

George Savvidy

2014-07-31T23:59:59.000Z

71

Giant Radio Pulses from the Millisecond Pulsar PSR B1937+21 at 327 MHz  

E-Print Network [OSTI]

Seven giant radio pulses were recorded from the millisecond pulsar PSR B1937+21 during $\\approx$ 8.1 minutes observation by the Ooty Radio Telescope (ORT) at 326.5 MHz. Although sparse, these observations support most of the giant pulse behavior reported at higher radio frequencies (430 to 2380 MHz). Within the main componentof the integrated profile, they are emitted only in a narrow ($\\la$ 47 $\\mu$s) window of pulse phase, close to its peak. This has important implications for doing super-high precision timing of PSR B1937+21 at low radio frequencies.

M. Vivekanand

2002-05-13T23:59:59.000Z

72

Proton Angular Distribution for 90 Mev Neutron-proton Scattering  

E-Print Network [OSTI]

recoil protons in neutron -proton scattering at 90 Mev hasFOR 90 lWEV NEUTRON-PROTON SCATTERING James Hadley, Cecil E.

Hadley, James

2010-01-01T23:59:59.000Z

73

Trends in the study of light proton rich nuclei  

SciTech Connect (OSTI)

Recent work in light proton-rich nuclei is reviewed. Evidence for the first T/sub z/ = -5/2 nuclide, /sup 35/Ca, is presented. The mechanisms of two-proton emission following beta-decay is investigated. Future directions in this field are discussed. 23 refs., 5 figs. (WRF)

Moltz, D.M.; Aysto, J.; Hotchkis, M.A.C.; Cerny, J.

1985-09-01T23:59:59.000Z

74

Fine Structure Studies in Proton Emission  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsing ZirconiaPolicyFeasibilityField Office FinalFinancing

75

Numerical and experimental study of the thermal stress of silicon induced by a millisecond laser  

SciTech Connect (OSTI)

A spatial axisymmetric finite element model of single-crystal silicon irradiated by a 1064 nm millisecond laser is used to investigate the thermal stress damage induced by a millisecond laser. The transient temperature field and the thermal stress field for 2 ms laser irradiation with a laser fluence of 254 J/cm{sup 2} are obtained. The numerical simulation results indicate that the hoop stresses along the r axis on the front surface are compressive stress within the laser spot and convert to tensile stress outside the laser spot, while the radial stresses along the r axis on the front surface and on the z axis are compressive stress. The temperature of the irradiated center is the highest temperature obtained, yet the stress is not always highest during laser irradiation. At the end of the laser irradiation, the maximal hoop stress is located at r=0.5 mm and the maximal radial stress is located at r=0.76 mm. The temperature measurement experiments are performed by IR pyrometer. The numerical result of the temperature field is consistent with the experimental result. The damage morphologies of silicon under the action of a 254 J/cm{sup 2} laser are inspected by optical microscope. The cracks are observed initiating at r=0.5 mm and extending along the radial direction.

Wang Xi; Qin Yuan; Wang Bin; Zhang Liang; Shen Zhonghua; Lu Jian; Ni Xiaowu

2011-07-20T23:59:59.000Z

76

A PARALLAX DISTANCE AND MASS ESTIMATE FOR THE TRANSITIONAL MILLISECOND PULSAR SYSTEM J1023+0038  

SciTech Connect (OSTI)

The recently discovered transitional millisecond pulsar system J1023+0038 exposes a crucial evolutionary phase of recycled neutron stars for multiwavelength study. The system, comprising the neutron star itself, its stellar companion, and the surrounding medium, is visible across the electromagnetic spectrum from the radio to X-ray/gamma-ray regimes and offers insight into the recycling phase of millisecond pulsar evolution. Here, we report on multiple-epoch astrometric observations with the Very Long Baseline Array (VLBA) which give a system parallax of 0.731 {+-} 0.022 milliarcseconds (mas) and a proper motion of 17.98 {+-} 0.05 mas yr{sup -1}. By combining our results with previous optical observations, we are able to use the parallax distance of 1368{sup +42}{sub -{sub 39}} pc to estimate the mass of the pulsar to be 1.71 {+-} 0.16 M{sub Sun }, and we are also able to measure the three-dimensional space velocity of the system to be 126 {+-} 5 km s{sup -1}. Despite the precise nature of the VLBA measurements, the remaining {approx}3% distance uncertainty dominates the 0.16 M{sub Sun} error on our mass estimate.

Deller, A. T. [Netherlands Institute for Radio Astronomy (ASTRON), 7990-AA Dwingeloo (Netherlands); Archibald, A. M.; Kaspi, V. M. [Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8 (Canada); Brisken, W. F. [National Radio Astronomy Observatory, Socorro, NM 87801 (United States); Chatterjee, S. [Astronomy Department, Cornell University, Ithaca, NY 14853 (United States); Janssen, G. H.; Lyne, A. G.; Stappers, B. [Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom); Lorimer, D.; McLaughlin, M. A. [Department of Physics, West Virginia University, Morgantown, WV 26506 (United States); Ransom, S. [National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States); Stairs, I. H. [Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1 (Canada)

2012-09-10T23:59:59.000Z

77

The X-ray afterglow flat segment in short GRB 051221A: Energy injection from a millisecond magnetar?  

E-Print Network [OSTI]

The flat segment lasting $\\sim 10^4$ seconds in the X-ray afterglow of GRB051221A represents the first clear case of strong energy injection in the external shock of a short GRB afterglow. In this work, we show that a millisecond pulsar with dipole magnetic field $\\sim 10^{14}$ Gauss could well account for that energy injection. The good quality X-ray flat segment thus suggests that the central engine of this short burst may be a millisecond magnetar.

Yizhong Fan; Dong Xu

2006-07-12T23:59:59.000Z

78

Modeling the observed proton aurora and ionospheric convection responses to changes in the IMF clock angle  

E-Print Network [OSTI]

Modeling the observed proton aurora and ionospheric convection responses to changes in the IMF clock angle: 1. Persistence of cusp proton aurora K. Throp, M. Lockwood,1 B. S. Lanchester, and S. K employ a numerical model of cusp ion precipitation and proton aurora emission to fit variations

Lockwood, Mike

79

What's In a Proton?  

ScienceCinema (OSTI)

Physicist Peter Steinberg explains that fundamental particles like protons are themselves made up of still smaller particles called quarks. He discusses how new particles are produced when quarks are liberated from protons...a process that can be observed

Brookhaven Lab

2010-01-08T23:59:59.000Z

80

Quick extended x-ray absorption fine structure instrument with millisecond time scale, optimized for in situ applications  

E-Print Network [OSTI]

Quick extended x-ray absorption fine structure instrument with millisecond time scale, optimized of quick extended x-ray absorption fine structure QEXAFS and quick x-ray absorption near edge structure- tion spectroscopy XAS was developed in energy dispersive and quick extended x-ray absorption fine

Sparks, Donald L.

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Deformed proton emitters.  

SciTech Connect (OSTI)

The mechanisms of proton radioactivity from deformed rare earth nuclei are discussed and preliminary results on the fine structure decay of {sup 131}Eu are presented.

Carpenter, M. P.; Cizewski, J. A.; Davids, C. N.; Davinson, T.; Fotiades, N.; Henderson, D. J.; Janssens, R. V. F.; Lauritsen, T.; Reiter, P.; Ressler, J. J.; Schwartz, J.; Seweryniak, D.; Sonzogni, A. A.; Uusitalok, J.; Walters, W. B.; Wiedenhover, I. L.; Woods, P. J.

1999-02-17T23:59:59.000Z

82

Proton-Antiproton  

ScienceCinema (OSTI)

Dernire session du cours sur proton-antiproton du Cern Accelarator School. John Peoples, directeur de Fermilab fait un expos suivi de questions.

None

2011-04-25T23:59:59.000Z

83

INFRARED OBSERVATIONS OF THE MILLISECOND PULSAR BINARY J1023+0038: EVIDENCE FOR THE SHORT-TERM NATURE OF ITS INTERACTING PHASE IN 2000-2001  

SciTech Connect (OSTI)

We report our multi-band infrared (IR) imaging of the transitional millisecond pulsar system J1023+0038, a rare pulsar binary known to have an accretion disk in 2000-2001. The observations were carried out with ground-based and space telescopes from near-IR to far-IR wavelengths. We detected the source in near-IR JH bands and Spitzer 3.6 and 4.5 {mu}m mid-IR channels. Combined with the previously reported optical spectrum of the source, the IR emission is found to arise from the companion star, with no excess emission detected in the wavelength range. Because our near-IR fluxes are nearly equal to those obtained by the 2MASS all-sky survey in 2000 February, the result indicates that the binary did not contain the accretion disk at the time, whose existence would have raised the near-IR fluxes to twice larger values. Our observations have thus established the short-term nature of the interacting phase seen in 2000-2001: the accretion disk existed for at most 2.5 yr. The binary was not detected by the WISE all-sky survey carried out in 2010 at its 12 and 22 {mu}m bands and our Herschel far-IR imaging at 70 and 160 {mu}m. Depending on the assumed properties of the dust, the resulting flux upper limits provide a constraint of <3 Multiplication-Sign 10{sup 22}-3 Multiplication-Sign 10{sup 25} g on the mass of the dust grains that possibly exist as the remnants of the previously seen accretion disk.

Wang, Xuebing; Wang, Zhongxiang [Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030 (China)] [Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030 (China); Morrell, Nidia [Las Campanas Observatory, Observatories of the Carnegie Institution of Washington, La Serena (Chile)] [Las Campanas Observatory, Observatories of the Carnegie Institution of Washington, La Serena (Chile)

2013-02-20T23:59:59.000Z

84

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

E-Print Network [OSTI]

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

D. J. B. Payne; A. Melatos

2006-07-11T23:59:59.000Z

85

Proton radioactivity within a generalized liquid drop model  

E-Print Network [OSTI]

The proton radioactivity half-lives of spherical proton emitters are investigated theoretically. The potential barriers preventing the emission of protons are determined in the quasimolecular shape path within a generalized liquid drop model (GLDM) including the proximity effects between nuclei in a neck and the mass and charge asymmetry. The penetrability is calculated with the WKB approximation. The spectroscopic factor has been taken into account in half-life calculation, which is obtained by employing the relativistic mean field (RMF) theory combined with the BCS method with the force NL3. The half-lives within the GLDM are compared with the experimental data and other theoretical values. The GLDM works quite well for spherical proton emitters when the spectroscopic factors are considered, indicating the necessity of introducing the spectroscopic factor and the success of the GLDM for proton emission. Finally, we present two formulas for proton emission half-life calculation similar to the Viola-Seaborg formulas and Royer's formulas of alpha decay.

J. M. Dong; H. F. Zhang; G. Royer

2009-06-02T23:59:59.000Z

86

PSR J17232837: AN ECLIPSING BINARY RADIO MILLISECOND PULSAR  

SciTech Connect (OSTI)

We present a study of PSR J17232837, an eclipsing, 1.86 ms millisecond binary radio pulsar discovered in the Parkes Multibeam survey. Radio timing indicates that the pulsar has a circular orbit with a 15 hr orbital period, a low-mass companion, and a measurable orbital period derivative. The eclipse fraction of ?15% during the pulsar's orbit is twice the Roche lobe size inferred for the companion. The timing behavior is significantly affected by unmodeled systematics of astrophysical origin, and higher-order orbital period derivatives are needed in the timing solution to account for these variations. We have identified the pulsar's (non-degenerate) companion using archival ultraviolet, optical, and infrared survey data and new optical photometry. Doppler shifts from optical spectroscopy confirm the star's association with the pulsar and indicate a pulsar-to-companion mass ratio of 3.3 0.5, corresponding to a companion mass range of 0.4 to 0.7 M{sub ?} and an orbital inclination angle range of between 30 and 41, assuming a pulsar mass range of 1.4-2.0 M{sub ?}. Spectroscopy indicates a spectral type of G for the companion and an inferred Roche-lobe-filling distance that is consistent with the distance estimated from radio dispersion. The features of PSR J17232837 indicate that it is likely a 'redback' system. Unlike the five other Galactic redbacks discovered to date, PSR J17232837 has not been detected as a ?-ray source with Fermi. This may be due to an intrinsic spin-down luminosity that is much smaller than the measured value if the unmeasured contribution from proper motion is large.

Crawford, Fronefield [Department of Physics and Astronomy, Franklin and Marshall College, P.O. Box 3003, Lancaster, PA 17604 (United States); Lyne, Andrew G. [Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL (United Kingdom); Stairs, Ingrid H. [Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1 (Canada); Kaplan, David L. [Physics Department, University of Wisconsin - Milwaukee, Milwaukee, WI 53211 (United States); McLaughlin, Maura A.; Lorimer, Duncan R. [Department of Physics, West Virginia University, Morgantown, WV 26506 (United States); Freire, Paulo C. C.; Kramer, Michael [Max-Planck-Institut fr Radioastronomie, auf dem Huegel 69, D-53121 Bonn (Germany); Burgay, Marta; D'Amico, Nichi; Possenti, Andrea [INAF - Osservatorio Astronomico di Cagliari, Poggio dei Pini, I-09012 Capoterra (Italy); Camilo, Fernando [Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States); Faulkner, Andrew [Cavendish Laboratory, University of Cambridge, J. J. Thompson Avenue, Cambridge, CB3 0HE (United Kingdom); Manchester, Richard N. [CSIRO Astronomy and Space Science, Australia Telescope National Facility, P.O. Box 76, Epping, NSW 1710 (Australia); Steeghs, Danny, E-mail: fcrawfor@fandm.edu [Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)

2013-10-10T23:59:59.000Z

87

Proton Exchange Membrane Fuel Cells for Electrical Power Generation On-Board Commercial Airplanes  

Fuel Cell Technologies Publication and Product Library (EERE)

Deployed on a commercial airplane, proton exchange membrane fuel cells may offer emissions reductions, thermal efficiency gains, and enable locating the power near the point of use. This work seeks to

88

Radiative proton-antiproton annihilation to a lepton pair  

SciTech Connect (OSTI)

The annihilation of proton and antiproton to an electron-positron pair, including radiative corrections due to the emission of virtual and real photons is considered. The results are generalized to leading and next-to leading approximations. The relevant distributions are derived and numerical applications are given in the kinematical range accessible to the PANDA experiment at the FAIR facility.

Ahmadov, A. I. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Institute of Physics, Azerbaijan National Academy of Sciences, Baku (Azerbaijan); Bytev, V. V.; Kuraev, E. A. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Tomasi-Gustafsson, E. [CEA, IRFU, SPhN, Saclay, 91191 Gif-sur-Yvette Cedex, France, and CNRS/IN2P3, Institut de Physique Nucleaire, UMR 8608, 91405 Orsay (France)

2010-11-01T23:59:59.000Z

89

A Model of Proton  

E-Print Network [OSTI]

I suggest to consider a proton as a body in a state of free precession. Such approach allows to define a proton as periodic system with two rotary degrees of freedom with corresponding frequency ratio and resonances. In result on a power scale the points corresponding to a birth of leptons are designated. The interrelation between masses of leptons is established through a fine structure constant. The given approach is distributed to a nucleus. Other representation is given on the nature of X-rays which connect with a charge of a nucleus and its mass.

Vladislav Shchegolev

2005-06-14T23:59:59.000Z

90

Self-sustained asymmetry of lepton-number emission: A new phenomenon during the supernova shock-accretion phase in three dimensions  

E-Print Network [OSTI]

During the stalled-shock phase of our 3D hydrodynamical core-collapse simulations with energy-dependent, 3-flavor neutrino transport, the lepton-number flux (nue minus antinue) emerges predominantly in one hemisphere. This novel, spherical-symmetry breaking neutrino-hydrodynamical instability is termed LESA for "Lepton-number Emission Self-sustained Asymmetry." While the individual nue and antinue fluxes show a pronounced dipole pattern, the heavy-flavor neutrino fluxes and the overall luminosity are almost spherically symmetric. Initially, LESA seems to develop stochastically from convective fluctuations, it exists for hundreds of milliseconds or more, and it persists during violent shock sloshing associated with the standing accretion shock instability. The nue minus antinue flux asymmetry originates mainly below the neutrinosphere in a region of pronounced proto-neutron star (PNS) convection, which is stronger in the hemisphere of enhanced lepton-number flux. On this side of the PNS, the mass-accretion rate of lepton-rich matter is larger, amplifying the lepton-emission asymmetry, because the spherical stellar infall deflects on a dipolar deformation of the stalled shock. The increased shock radius in the hemisphere of less mass accretion and minimal lepton-number flux (antinue flux maximum) is sustained by stronger convection on this side, which is boosted by stronger neutrino heating because the average antinue energy is higher than the average nue energy. Asymmetric heating thus supports the global deformation despite extremely nonstationary convective overturn behind the shock. While these different elements of LESA form a consistent picture, a full understanding remains elusive at present. There may be important implications for neutrino-flavor oscillations, the neutron-to-proton ratio in the neutrino-heated supernova ejecta, and neutron-star kicks, which remain to be explored.

Irene Tamborra; Florian Hanke; Hans-Thomas Janka; Bernhard Mueller; Georg G. Raffelt; Andreas Marek

2014-07-31T23:59:59.000Z

91

SPIN EVOLUTION OF MILLISECOND MAGNETARS WITH HYPERACCRETING FALLBACK DISKS: IMPLICATIONS FOR EARLY AFTERGLOWS OF GAMMA-RAY BURSTS  

SciTech Connect (OSTI)

The shallow decay phase or plateau phase of early afterglows of gamma-ray bursts (GRBs), discovered by Swift, is currently understood as being due to energy injection to a relativistic blast wave. One natural scenario for energy injection invokes a millisecond magnetar as the central engine of GRBs because the conventional model of a pulsar predicts a nearly constant magnetic-dipole-radiation luminosity within the spin-down timescale. However, we note that significant brightening occurs in some early afterglows, which apparently conflicts with the above scenario. Here we propose a new model to explain this significant brightening phenomena by considering a hyperaccreting fallback disk around a newborn millisecond magnetar. We show that for typical values of the model parameters, sufficient angular momentum of the accreted matter is transferred to the magnetar and spins it up. It is this spin-up that leads to a dramatic increase of the magnetic-dipole-radiation luminosity with time and thus significant brightening of an early afterglow. Based on this model, we carry out numerical calculations and fit well early afterglows of 12 GRBs assuming sufficiently strong fallback accretion. If the accretion is very weak, our model turns out to be the conventional energy-injection scenario of a pulsar. Therefore, our model can provide a unified explanation for the shallow decay phase, plateaus, and significant brightening of early afterglows.

Dai, Z. G.; Liu Ruoyu, E-mail: dzg@nju.edu.cn, E-mail: ryliu@nju.edu.cn [School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China)

2012-11-01T23:59:59.000Z

92

Smashing Protons to Smithereens  

ScienceCinema (OSTI)

Pleier discusses the extraordinary research taking place at the Large Hadron Collider (LHC) ? the world?s newest, biggest, and highest energy particle accelerator located at CERN. Pleier is one of hundreds of researchers from around the world working on ATLAS, a seven-story particle detector positioned at a point where the LHC?s oppositely circulating beams of protons slam into one another head-on.

Marc-Andr Pleier

2010-09-01T23:59:59.000Z

93

Chandra X-ray and Gemini near-infrared observations of the eclipsing millisecond pulsar SWIFT J1749.4-2807 in quiescence  

E-Print Network [OSTI]

We report on Chandra X-ray and Gemini-North near-infrared K-band observations of the eclipsing accretion-powered millisecond X-ray pulsar SWIFT J1749.4?2807 in quiescence. Using the Chandra observation we derive a source ...

Chakrabarty, Deepto

94

Proton Transfer and Proton Concentrations in Protonated Nafion Fuel Cell Membranes D. B. Spry and M. D. Fayer*  

E-Print Network [OSTI]

Proton Transfer and Proton Concentrations in Protonated Nafion Fuel Cell Membranes D. B. Spry and M 21, 2009; ReVised Manuscript ReceiVed: June 3, 2009 Proton transfer in protonated Nafion fuel cell electrolyte fuel cells (PEFCs).1 In a PEFC, hydrogen is oxidized at the anode to generate a supply

Fayer, Michael D.

95

Cataractogenic effects of proton radiation  

E-Print Network [OSTI]

vulnerable organs, created an urgent need for investigation of proton radiation cataracto- genesis. In a statistical analysis of collected data on solar proton events taking into consideration possible shield- ing and mission duration, an investigator... energy group to a high of 74 for the 20 Mev proton energy group. As previously stated, the maximum possible numerical value was 400. The mean values for degree of lens opacities for the controls and the five dosage subgroups within the 10 Mev, 20 Mev...

Kyzar, James Ronald

1972-01-01T23:59:59.000Z

96

Beta-Delayed Two-Particle Emission  

SciTech Connect (OSTI)

A panorama of beta-delayed nuclear decay is sketched. Beginning with beta-delayed two-neutron emission, the author moves on to beta-delayed two-proton emission and beta-delayed multiparticle emission. After touching briefly on the theoretical approach to understanding these phenomena, he reports on two experiments done at ISOLDE (CERN) on the decay of {sup 31}Ar with the goal of studying the mechanisms of {beta}-delayed two proton emission. This example shows the potentiality of the new technology that allows design setups with high efficiency for multiparticle detection. In combination with high-purity sources and the use of low-energy beams to produce point-like sources, information at the drip line can be extracted that is of comparable quality to that obtained near stability.

Borge, M.J.G.

2000-12-31T23:59:59.000Z

97

Protons - 88-Inch Cyclotron  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinanInformation Desert Southwest RegionatSearch Welcome to theNewsCenter for Gas SeparationsRelevant toProtons

98

PROTON RESONANCE SPECTROSCOPY  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - September 2006 TheSteven Ashby Dr. Steven Para buscar unaPROHIBITEDPROSIG,PROTON

99

Proton Resonance Spectroscopy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - SeptemberMicroneedlesAdvanced Photon SourceProton ChannelResonance

100

History of Proton Linear Accelerators  

E-Print Network [OSTI]

much. References 1. Linear Accelerators, edited by P. M .at the 1986 Linear Accelerator Conference, SLAC, Stanford,HISTORY OF PROTON LINEAR ACCELERATORS Luis W. Alvarez TWO-

Alvarez, Luis W.

1987-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Scientists examine proton radiography of brain mockup  

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

Scientists examine proton radiography of brain mockup The use of such a high-energy proton beam is ideal for imaging small tumors within patients for targeted proton therapy. March...

102

Advanced Materials for Proton Exchange Membranes | Department...  

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

Advanced Materials for Proton Exchange Membranes Advanced Materials for Proton Exchange Membranes A presentation to the High Temperature Membranes Working Group meeting, May 19,...

103

The Connection Between Low-Mass X-ray Binaries and (Millisecond) Pulsars: A Binary Evolution Perspective  

E-Print Network [OSTI]

I review the evolutionary connection between low-mass X-ray binaries (LMXBs) and pulsars with binary companions (bPSRs) from a stellar binary evolution perspective. I focus on the evolution of stellar binaries with end-states consisting of a pulsar with a low-mass (<1.0 solar mass) companion, starting at the point the companion's progenitor first initiates mass transfer onto the neutron star. Whether this mass transfer is stable and the physics driving ongoing mass transfer partitions the phase space of the companions's initial mass and initial orbital period into five regions. The qualitative nature of the mass-transfer process and the binary's final end-state differ between systems in each region; four of these regions each produce a particular class of LMXBs. I compare the theoretical expectations to the populations of galactic field LMXBs with companion-mass constraints and field bPSRs. I show that the population of accreting millisecond pulsars are all identified with only two of the four LMXB classes and that these systems do not have readily identifiable progeny in the bPSR population. I discuss which sub-populations of bPSRs can be explained by binary evolution theory and those that currently are not. Finally I discuss some outstanding questions in this field.

Christopher J. Deloye

2007-10-01T23:59:59.000Z

104

Proton-Coupled Electron Transfer  

SciTech Connect (OSTI)

Proton-Coupled Electron Transfer (PCET) describes reactions in which there is a change in both electron and proton content between reactants and products. It originates from the influence of changes in electron content on acid?base properties and provides a molecular-level basis for energy transduction between proton transfer and electron transfer. Coupled electron?proton transfer or EPT is defined as an elementary step in which electrons and protons transfer from different orbitals on the donor to different orbitals on the acceptor. There is (usually) a clear distinction between EPT and H-atom transfer (HAT) or hydride transfer, in which the transferring electrons and proton come from the same bond. Hybrid mechanisms exist in which the elementary steps are different for the reaction partners. EPT pathways such as PhO/PhOH exchange have much in common with HAT pathways in that electronic coupling is significant, comparable to the reorganization energy with H{sub DA} ~ ?. Multiple-Site Electron?Proton Transfer (MS-EPT) is an elementary step in which an electron?proton donor transfers electrons and protons to different acceptors, or an electron?proton acceptor accepts electrons and protons from different donors. It exploits the long-range nature of electron transfer while providing for the short-range nature of proton transfer. A variety of EPT pathways exist, creating a taxonomy based on what is transferred, e.g., 1e{sup -}/2H{sup +} MS-EPT. PCET achieves redox potential leveling between sequential couples and the buildup of multiple redox equivalents, which is of importance in multielectron catalysis. There are many examples of PCET and pH-dependent redox behavior in metal complexes, in organic and biological molecules, in excited states, and on surfaces. Changes in pH can be used to induce electron transfer through films and over long distances in molecules. Changes in pH, induced by local electron transfer, create pH gradients and a driving force for long-range proton transfer in Photosysem II and through other biological membranes. In EPT, simultaneous transfer of electrons and protons occurs on time scales short compared to the periods of coupled vibrations and solvent modes. A theory for EPT has been developed which rationalizes rate constants and activation barriers, includes temperature- and driving force (?G)-dependences implicitly, and explains kinetic isotope effects. The distance-dependence of EPT is dominated by the short-range nature of proton transfer, with electron transfer being far less demanding.Changes in external pH do not affect an EPT elementary step. Solvent molecules or buffer components can act as proton donor acceptors, but individual H2O molecules are neither good bases (pK{sub a}(H{sub 3}O{sup +}) = ?1.74) nor good acids (pK{sub a}(H{sub 2}O) = 15.7). There are many examples of mechanisms in chemistry, in biology, on surfaces, and in the gas phase which utilize EPT. PCET and EPT play critical roles in the oxygen evolving complex (OEC) of Photosystem II and other biological reactions by decreasing driving force and avoiding high-energy intermediates.

Weinberg, Dave; Gagliardi, Christopher J.; Hull, Jonathan F; Murphy, Christine Fecenko; Kent, Caleb A.; Westlake, Brittany C.; Paul, Amit; Ess, Daniel H; McCafferty, Dewey Granville; Meyer, Thomas J

2012-01-01T23:59:59.000Z

105

Parametric Model for Astrophysical Proton-Proton Interactions and Applications  

SciTech Connect (OSTI)

Observations of gamma-rays have been made from celestial sources such as active galaxies, gamma-ray bursts and supernova remnants as well as the Galactic ridge. The study of gamma rays can provide information about production mechanisms and cosmic-ray acceleration. In the high-energy regime, one of the dominant mechanisms for gamma-ray production is the decay of neutral pions produced in interactions of ultra-relativistic cosmic-ray nuclei and interstellar matter. Presented here is a parametric model for calculations of inclusive cross sections and transverse momentum distributions for secondary particles--gamma rays, e{sup {+-}}, {nu}{sub e}, {bar {nu}}{sub e}, {nu}{sub {mu}} and {bar {nu}}{sub {mu}}--produced in proton-proton interactions. This parametric model is derived on the proton-proton interaction model proposed by Kamae et al.; it includes the diffraction dissociation process, Feynman-scaling violation and the logarithmically rising inelastic proton-proton cross section. To improve fidelity to experimental data for lower energies, two baryon resonance excitation processes were added; one representing the {Delta}(1232) and the other multiple resonances with masses around 1600 MeV/c{sup 2}. The model predicts the power-law spectral index for all secondary particle to be about 0.05 lower in absolute value than that of the incident proton and their inclusive cross sections to be larger than those predicted by previous models based on the Feynman-scaling hypothesis. The applications of the presented model in astrophysics are plentiful. It has been implemented into the Galprop code to calculate the contribution due to pion decays in the Galactic plane. The model has also been used to estimate the cosmic-ray flux in the Large Magellanic Cloud based on HI, CO and gamma-ray observations. The transverse momentum distributions enable calculations when the proton distribution is anisotropic. It is shown that the gamma-ray spectrum and flux due to a pencil beam of protons varies drastically with viewing angle. A fanned proton jet with a Gaussian intensity profile impinging on surrounding material is given as a more realistic example. As the observer is moved off the jet axis, the peak of the spectrum is moved to lower energies.

Karlsson, Niklas; /Royal Inst. Tech., Stockholm; ,

2008-01-29T23:59:59.000Z

106

Proton-proton Scattering Above 3 GeV/c  

SciTech Connect (OSTI)

A large set of data on proton-proton differential cross sections, analyzing powers and the double-polarization parameter A{sub NN} is analyzed employing the Regge formalism. We find that the data available at proton beam momenta from 3 GeV/c to 50 GeV/c exhibit features that are very well in line with the general characteristics of Regge phenomenology and can be described with a model that includes the {rho}, {omega}, f{sub 2}, and a{sub 2} trajectories and single-Pomeron exchange. Additional data, specifically for spin-dependent observables at forward angles, would be very helpful for testing and refining our Regge model.

A. Sibirtsev, J. Haidenbauer, H.-W. Hammer S. Krewald ,Ulf-G. Meissner

2010-01-01T23:59:59.000Z

107

Measurement of the Wolfenstein parameters for proton-proton and proton-neutron scattering at 500 MeV  

SciTech Connect (OSTI)

Using liquid hydrogen and liquid deuterium targets respectively, forward angle (ten degrees to sixty degrees in the center of Mass) free proton-proton and quasielastic proton-proton and proton-neutron triple scattering data at 500 MeV have been obtained using the high resolution spectrometer at the Los Alamos Meson Physics Facility. The data are in reasonable agreement with recent predictions from phase shift analyses, indicating that the proton-nucleon scattering amplitudes are fairly well determined at 500 MeV. 32 references.

Marshall, J.A.

1984-07-01T23:59:59.000Z

108

Proton irradiation effect on SCDs  

E-Print Network [OSTI]

The Low Energy X-ray Telescope is a main payload on the Hard X-ray Modulation Telescope satellite. The swept charge device is selected for the Low Energy X-ray Telescope. As swept charge devices are sensitive to proton irradiation, irradiation test was carried out on the HI-13 accelerator at the China Institute of Atomic Energy. The beam energy was measured to be 10 MeV at the SCD. The proton fluence delivered to the SCD was $3\\times10^{8}\\mathrm{protons}/\\mathrm{cm}^{2}$ over two hours. It is concluded that the proton irradiation affects both the dark current and the charge transfer inefficiency of the SCD through comparing the performance both before and after the irradiation. The energy resolution of the proton-irradiated SCD is 212 eV@5.9 keV at $-60\\,^{\\circ}\\mathrm{C}$, while it before irradiated is 134 eV. Moreover, better performance can be reached by lowering the operating temperature of the SCD on orbit.

Yan-Ji Yang; Jing-Bin Lu; Yu-Sa Wang; Yong Chen; Yu-Peng Xu; Wei-Wei Cui; Wei Li; Zheng-Wei Li; Mao-Shun Li; Xiao-Yan Liu; Juan Wang; Da-Wei Han; Tian-Xiang Chen; Cheng-Kui Li; Jia Huo; Wei Hu; Yi Zhang; Bo Lu; Yue Zhu; Ke-Yan Ma; Di Wu; Yan Liu; Zi-Liang Zhang; Guo-He Yin; Yu Wang

2014-04-19T23:59:59.000Z

109

Proton-proton fusion in lattice effective field theory  

E-Print Network [OSTI]

The proton-proton fusion rate is calculated at low energy in a lattice effective field theory (EFT) formulation. The strong and the Coulomb interactions are treated non-perturbatively at leading order in the EFT. The lattice results are shown to accurately describe the low energy cross section within the validity of the theory at energies relevant to solar physics. In prior work in the literature, Coulomb effects were generally not included in non-perturbative lattice calculations. Work presented here is of general interest in nuclear lattice EFT calculations that involve Coulomb effects at low energy. It complements recent developments of the adiabatic projection method for lattice calculations of nuclear reactions.

Gautam Rupak; Pranaam Ravi

2014-11-10T23:59:59.000Z

110

Proton Radioactivity Measurements at HRIBF: Ho, Lu, and Tm Isotopes  

SciTech Connect (OSTI)

Two new isotopes, {sup 145}Tm and {sup 140}Ho and three isomers in previously known isotopes, {sup 141m}Ho, {sup 150m}Lu and {sup 151m}Lu have been discovered and studied via their decay by proton emission. These proton emitters were produced at the Holifield Radioactive Ion Beam Facility (HRIBF) by heavy-ion fusion-evaporation reactions, separated in A/Q with a recoil mass spectrometer (RMS), and detected in a double-sided silicon strip detector (DSSD). The decay energy and half-life was measured for each new emitter. An analysis in terms of a spherical shell model is applied to the Tm and Lu nuclei, but Ho is considerably deformed and requires a collective model interpretation.

Akovali, Y.; Batchelder, J.C.; Bingham, C.R.; Davinson, T.; Ginter, T.N.; Gross, C.J.; Grzywacz, R.; Hamilton, J.H.; Janas, Z.; Karny, M.; Kim, S.H.; MacDonald, B.D.; Mas, J.F.; McConnell, J.W.; Piechaczek, A.; Ressler, J.J.; Rykaczewski, K.; Slinger, R.C.; Szerypo, J.; Toth, K.S.; Weintraub, W.; Woods, P.J.; Yu, C.-H.; Zganjar, E.F.

1998-11-13T23:59:59.000Z

111

Proton Mass Shift in Muonic Hydrogen Atom  

E-Print Network [OSTI]

We show that the value of the proton mass depends on each bound state of muonic or electronic hydrogen atom. The charged particle bound to the proton produces magnetic field inside the proton. This makes a change to the amount of chiral condensate inside the proton. The change gives rise to the shift in the value of the proton mass. Numerically, the shift in the $2S$ state of the muonic hydrogen atom can be of the order of $0.1$ meV. The effect may solve the puzzle of the proton radius.

Aiichi Iwazaki

2014-08-11T23:59:59.000Z

112

Saving Fuel, Reducing Emissions  

E-Print Network [OSTI]

lower greenhouse gas emissions from electricity productionAssessment of Greenhouse Gas Emissions from Plug-in Hybridof national greenhouse gas emissions. Both motor vehicle

Kammen, Daniel M.; Arons, Samuel M.; Lemoine, Derek M.; Hummel, Holmes

2009-01-01T23:59:59.000Z

113

Soft Pion Emission in Hard Exclusive Pion Production  

E-Print Network [OSTI]

We investigate hard exclusive reactions on the nucleon with soft pion emission. A parametrization of corresponding hadronic matrix elements in terms of parton distributions for final pion-nucleon state is provided. These distributions are calculated in terms of nucleon and pion GPDs and the pion distribution amplitude via soft-pion theorems. Some observables for the process of hard charged pion production on the proton with soft pion emission are computed.

Maxim V. Polyakov; Simone Stratmann

2006-09-05T23:59:59.000Z

114

Transport-theoretic model for the electron-proton-hydrogen atom auroa. II. Model results  

SciTech Connect (OSTI)

In a companion paper, a self-consistent transport-theoretic model for the combined electron-proton-hydrogen atom aurora was described. In this paper, numberical results based on the model are presented. This is done for the pure electron aurora, the pure proton-hydrogen atom aurora, and finally for the combined aurora. Adopting commonly used types of energy distributions for the incident particle (electron and proton) fluxes, the authors give numerical solutions for the precipitating electron, proton, and hydrogen atom differential number fluxes. Results are also given for ionization yields and emission yields of the following features: N{sub 2}{sup +} first negative group (3914 {Angstrom}), N{sub 2} second positive group (3371 {Angstrom}), selected N{sub 2} Lyman-Birge-Hopfields bands (1325, 1354, 1383, 1493, and all bands between 1700 and 1800 {Angstrom}), O I (1356 {Angstrom}), L{sub {alpha}} (1216 {Angstrom}), H{sub {beta}} (4861 {Angstrom}), and H{sub {alpha}} (6563 {Angstrom}). The yield at 1493 {Angstrom} also contains a contribution from N I (1493 {Angstrom}), which in fact dominates LBH emission. A major new result of this study is that the secondary electron flux produced by the proton-hydrogen atom aurora is much softer than that produced by the electron aurora. This increased softness is due to the fact that (for energies of aurora interest) cross sections for secondary electron flux produced by the proton-hydrogen atom aurora is much softer than that produced by the electron aurora. This increased softness is due to the fact that (for energies of auroral interest) cross sections for secondary electron production by proton and hydrogen atom impact decrease exponentially with increasing secondary electron energy, whereas the cross sections for electron impact decrease as an inverse power law with increasing secondary energy.

Strickland, D.J. [Computational Physics, Inc., Fairfax, VA (United States); Daniell, R.E. Jr. [Computational Physics, Inc., Newton, MA (United States); Basu, B. [Hanscom Air Force Base, MA (United States)] [and others

1993-12-01T23:59:59.000Z

115

Proton Resonance Spectroscopy -- Final Report  

SciTech Connect (OSTI)

This report summarizes work supported by the DOE Grant DE-FG02-96ER40990 during its duration from June 1996 to May 2009. Topics studied include (1) statistical descriptions of nuclear levels and measurements of proton resonances relevant to such descriptions, including measurements toward a complete level scheme for 30P, (2) the development of methods to estimate the missing fraction of levels in a given measurement, and (3) measurements at HRIBF relevant to nuclear astrophysics.

Shriner, Jr, J F

2009-07-27T23:59:59.000Z

116

Saving Fuel, Reducing Emissions  

E-Print Network [OSTI]

COMPACT EMISSIONS HEV PHEV marginal power plant is a coalpower uses relatively little coal, but in other cases emissions

Kammen, Daniel M.; Arons, Samuel M.; Lemoine, Derek M.; Hummel, Holmes

2009-01-01T23:59:59.000Z

117

Proton-proton bremsstrahlung: Consequences of different on-shell-point conditions  

SciTech Connect (OSTI)

Background: Proton-proton bremsstrahlung (pp{gamma}) is investigated both theoretically and experimentally. The pp{gamma} amplitudes can be classified according to the number and location of on-shell points at which they are evaluated. Quantitative understanding of the effect on the pp{gamma} cross section of using different on-shell-point conditions is lacking, but it is essential to identifying the photon emission mechanism governing the pp{gamma} process. Method: Four different pp{gamma} amplitudes, which include four-on-shell-point amplitudes and one-on-shell-point amplitude, are generated from a realistic one-boson-exchange (ROBE) model for pp scattering. These ROBE amplitudes are used to investigate the consequence of using different on-shell-point conditions in calculating the pp{gamma} cross sections. Purpose: We verify the validity of the ROBE pp{gamma} amplitudes. We explore similarities between the four-on-shell-point ROBE and two-u-two-t special (TuTts) soft-photon pp{gamma} amplitudes and important differences with the one-on-shell-point ROBE and Low pp{gamma} amplitudes. We demonstrate that the precision Kernfysisch Versneller Instituut (KVI) data can only be described by the four-on-shell-point (ROBE or TuTts) amplitude. We use the ROBE four-on-shell-point amplitude and one-on-shell-point amplitude to investigate systematically the effect of using different on-shell-point conditions to calculate the pp{gamma} cross section. Furthermore, we identify a general principle that governs the process. This general principle is also applicable to other bremsstrahlung processes involving the scattering of two identical nucleons. Results: (i) The four-on-shell-point ROBE (or TuTts) amplitude describes the high-precision KVI data much better than does the one-on-shell-point ROBE (or Low) amplitude. Although the contribution from the anomalous magnetic moment of the proton is very significant, it does not completely dominate the KVI pp{gamma} cross sections. (ii) The four-on-shell-point ROBE (or TuTts) amplitude describes the TRIUMF data better than does the one-on-shell-point ROBE (or Low) amplitude. (iii) The effect on the pp{gamma} cross section of using different on-shell-point conditions is significant in the hard-photon region, i.e., for small proton scattering angles {theta} (={theta}{sub 3}={theta}{sub 4}, symmetric scattering angles) far from the elastic limit ({theta}{yields}45 deg.); in contrast, the effect becomes insignificant in the vicinity of the elastic limit. Near the limit as {theta} tends to 45 deg. (or as the photon energy K approaches zero), the four-on-shell-point and one-on-shell-point amplitudes approach one another, a general principle applicable to all bremsstrahlung processes because only kinematics is involved. Conclusion: The four-on-shell-point ROBE amplitude provides a quantitative description of pp{gamma} cross sections. The anomalous magnetic moment is an important component of the photon emission mechanism. The four-on-shell-point property of the full ROBE amplitude is essential to properly describing the complete range of the precision KVI data and the TRIUMF data, although the one-on-shell-point ROBE amplitude is adequate in the region near the elastic limit.

Li, Yi; Liou, M. K.; Schreiber, W. M.; Gibson, B. F. [College of Physics and Technology, Guangxi University, Nanning, Guangxi 530004 (China); Department of Physics and Institute for Nuclear Theory, Brooklyn College of the City University of New York, Brooklyn, New York 11210 (United States); Department of Physics, College of Staten Island of the City University of New York, Staten Island, New York 10314 (United States); Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2011-09-15T23:59:59.000Z

118

Long-range azimuthal correlations in proton-proton and proton-nucleus collisions from the incoherent scattering of partons  

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

We show that the incoherent elastic scattering of partons, as present in a multi-phase transport model (AMPT), with a modest partonparton cross-section of ?=1.53 mb?=1.53 mb, naturally explains the long-range two-particle azimuthal correlation as observed in protonproton and protonnucleus collisions at the Large Hadron Collider.

Ma, Guo -Liang [Chinese Academy of Sciences, Shanghai (China).Shanghai Institute of Applied Physics; Bzdak, Adam [Brookhaven National Laboratory (BNL), Upton, NY (United States).Riken BNL Research Center

2014-12-01T23:59:59.000Z

119

Beta-delayed particle emission from neutron-deficient isotopes in the Z approximately 50 region  

E-Print Network [OSTI]

Experimental studies of beta-delayed proton and alpha-particle emission from precursors in the region close to the double shell closure at N=Z=50 are described. The results range from identification of new precursors like /sup 96/Ag and /sup 103,105/Sn, to determination of branching ratios, feeding of excited levels after particle emission and the energy available for proton emission. Comparison of the results with statistical-model calculations points to a resonance in the beta-strength function in the decay of /sup 110,112/I, /sup 113/Xe, /sup 114,116/Cs and /sup 117/Ba. (39 refs).

Tidemand-Petersson, P; Klepper, O; Plochocki, A; Roeckl, E; Schardt, D; Zylicz, J

1981-01-01T23:59:59.000Z

120

Molecular Mechanism of Biological Proton Transport  

SciTech Connect (OSTI)

Proton transport across lipid membranes is a fundamental aspect of biological energy transduction (metabolism). This function is mediated by a Grotthuss mechanism involving proton hopping along hydrogen-bonded networks embedded in membrane-spanning proteins. Using molecular simulations, the authors have explored the structural, dynamic, and thermodynamic properties giving rise to long-range proton translocation in hydrogen-bonded networks involving water molecules, or water wires, which are emerging as ubiquitous H{sup +}-transport devices in biological systems.

Pomes, R.

1998-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Mean transverse mass of hadrons in proton-proton reactions  

E-Print Network [OSTI]

An energy dependence of the mean transverse mass $\\langle m_T\\rangle$ at mid-rapidity in proton-proton ($p+p$) reactions is studied within the ultra-relativistic quantum molecular dynamics (UrQMD). The UrQMD model predicts a nonmonotonous dependence of $\\langle m_T\\rangle$ on collision energy for several hadron species: for $\\pi^+$, $p$, $K^+$, and $\\Lambda$ the mean transverse mass has a maximum at the center of mass energy region $5\\le \\sqrt{s}\\le 8$ GeV. These results are a consequence of an interplay of two contributions: 1) excitations and decays of the baryonic resonances $N^*$ and $\\Delta$; 2) excitations and decays of the baryonic strings. The UrQMD results do not show any nonmonotonous dependence of $\\langle m_T\\rangle$ on $\\sqrt{s}$ for $\\pi^-$, $K^{-}$, and antiprotons. Whether a nonmonotonous dependence of $\\langle m_T\\rangle$ at mid-rapidity on the collision energy for $\\pi^+$, $p$, $K^+$, and $\\Lambda$ is relevant for real $p+p$ interactions will be soon checked experimentally by the NA61/SHINE Collaboration.

V. Yu. Vovchenko; D. V. Anchishkin; M. I. Gorenstein

2015-01-23T23:59:59.000Z

122

Open charm production in high multiplicity proton-proton events at the LHC  

E-Print Network [OSTI]

We present the dependence of $D$ production on the charged particle multiplicity in proton-proton collisions at LHC energies. We show that, in a framework of source coherence, the open charm production exhibits a growth with the multiplicity which is stronger than linear in the high density domain. This departure from linearity was previously observed in the $J/\\psi$ inclusive data from proton-proton collisions at 7 TeV and was successfully described in our approach. Our assumption, the existence of coherence effects present in proton-proton collisions at high energy, applies for high multiplicity proton-proton collisions in the central rapidity region and should affect any hard observable.

Ferreiro, E G

2015-01-01T23:59:59.000Z

123

Proton beam therapy control system  

DOE Patents [OSTI]

A tiered communications architecture for managing network traffic in a distributed system. Communication between client or control computers and a plurality of hardware devices is administered by agent and monitor devices whose activities are coordinated to reduce the number of open channels or sockets. The communications architecture also improves the transparency and scalability of the distributed system by reducing network mapping dependence. The architecture is desirably implemented in a proton beam therapy system to provide flexible security policies which improve patent safety and facilitate system maintenance and development.

Baumann, Michael A; Beloussov, Alexandre V; Bakir, Julide; Armon, Deganit; Olsen, Howard B; Salem, Dana

2013-06-25T23:59:59.000Z

124

Proton beam therapy control system  

DOE Patents [OSTI]

A tiered communications architecture for managing network traffic in a distributed system. Communication between client or control computers and a plurality of hardware devices is administered by agent and monitor devices whose activities are coordinated to reduce the number of open channels or sockets. The communications architecture also improves the transparency and scalability of the distributed system by reducing network mapping dependence. The architecture is desirably implemented in a proton beam therapy system to provide flexible security policies which improve patent safety and facilitate system maintenance and development.

Baumann, Michael A; Beloussov, Alexandre V; Bakir, Julide; Armon, Deganit; Olsen, Howard B; Salem, Dana

2013-12-03T23:59:59.000Z

125

Proton beam therapy control system  

DOE Patents [OSTI]

A tiered communications architecture for managing network traffic in a distributed system. Communication between client or control computers and a plurality of hardware devices is administered by agent and monitor devices whose activities are coordinated to reduce the number of open channels or sockets. The communications architecture also improves the transparency and scalability of the distributed system by reducing network mapping dependence. The architecture is desirably implemented in a proton beam therapy system to provide flexible security policies which improve patent safety and facilitate system maintenance and development.

Baumann, Michael A. (Riverside, CA); Beloussov, Alexandre V. (Bernardino, CA); Bakir, Julide (Alta Loma, CA); Armon, Deganit (Redlands, CA); Olsen, Howard B. (Colton, CA); Salem, Dana (Riverside, CA)

2008-07-08T23:59:59.000Z

126

Proton beam therapy control system  

DOE Patents [OSTI]

A tiered communications architecture for managing network traffic in a distributed system. Communication between client or control computers and a plurality of hardware devices is administered by agent and monitor devices whose activities are coordinated to reduce the number of open channels or sockets. The communications architecture also improves the transparency and scalability of the distributed system by reducing network mapping dependence. The architecture is desirably implemented in a proton beam therapy system to provide flexible security policies which improve patent safety and facilitate system maintenance and development.

Baumann, Michael A. (Riverside, CA); Beloussov, Alexandre V. (San Bernardino, CA); Bakir, Julide (Alta Loma, CA); Armon, Deganit (Longmeadow, MA); Olsen, Howard B. (Irvine, CA); Salem, Dana (Riverside, CA)

2010-09-21T23:59:59.000Z

127

Oorja Protonics | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth'sOklahoma/Geothermal < Oklahoma Jump to: navigation,OleneOffOorja Protonics

128

Scientists examine proton radiography of brain mockup  

E-Print Network [OSTI]

the proton radiography team in this effort funded in part by the NNSA. Additional researchers include Fesseha Alamos National Security, LLC for the Department of Energy's NNSA #12;

129

Low temperature proton conducting oxide devices  

DOE Patents [OSTI]

A device for conducting protons at a temperature below 550.degree. C. includes a LAMOX ceramic body characterized by an alpha crystalline structure.

Armstrong, Timothy R. (Clinton, TN); Payzant, Edward A. (Oak Ridge, TN); Speakman, Scott A. (Oak Ridge, TN); Greenblatt, Martha (Highland Park, NJ)

2008-08-19T23:59:59.000Z

130

Call issued for Proton Radiography Facility proposals  

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

into FY17. January 5, 2015 Amy Clarke and Seth Imhoff of Materials Technology-Metallurgy (MST-6) align a copper density calibration object for a proton radiography...

131

Physics at a Fermilab Proton Driver  

E-Print Network [OSTI]

This report documents the physics case for building a 2 MW, 8 GeV superconducting linac proton driver at Fermilab.

M. G. Albrow; S. Antusch; K. S. Babu; T. Barnes; A. O. Bazarko; R. H. Bernstein; T. J. Bowles; S. J. Brice; A. Ceccucci; F. Cei; H. W. KCheung; D. C. Christian; J. I. Collar; J. Cooper; P. S. Cooper; A. Curioni; A. deGouvea; F. DeJongh; P. F. Derwent; M. V. Diwan; B. A. Dobrescu; G. J. Feldman; D. A. Finley; B. T. Fleming; S. Geer; G. L. Greene; Y. Grossman; D. A. Harris; C. J. Horowitz; D. W. Hertzog; P. Huber; J. Imazato; A. Jansson; K. P. Jungmann; P. A. Kasper; J. Kersten; S. H. Kettell; Y. Kuno; M. Lindner; M. Mandelkern; W. J. Marciano; W. Melnitchouk; O. Mena; D. G. Michael; J. P. Miller; G. B. Mills; J. G. Morfin; H. Nguyen

2005-09-16T23:59:59.000Z

132

Proton aurora related to intervals of pulsations of diminishing periods  

E-Print Network [OSTI]

Proton aurora related to intervals of pulsations of diminishing periods A. G. Yahnin,1 T. A precipitation produced by the cyclotron instability can be responsible for proton aurora. Indeed, the relationship between some types of proton aurora (proton spots and proton flashes) and pulsations in the Pc1

California at Berkeley, University of

133

Neutron emission and fragment yield in high-energy fission  

SciTech Connect (OSTI)

The KRIS special library of spectra and emission probabilities in the decays of 1500 nuclei excited up to energies between 150 and 250 MeV was developed for correctly taking into account the decay of highly excited nuclei appearing as fission fragments. The emission of neutrons, protons, and photons was taken into account. Neutron emission fromprimary fragments was found to have a substantial effect on the formation of yields of postneutron nuclei. The library was tested by comparing the calculated and measured yields of products originating from the fission of nuclei that was induced by high-energy protons. The method for calculating these yields was tested on the basis of experimental data on the thermal-neutroninduced fission of {sup 235}U nuclei.

Grudzevich, O. T., E-mail: ogrudzevich@ippe.ru; Klinov, D. A. [Institute for Physics and Power Engineering (Russian Federation)] [Institute for Physics and Power Engineering (Russian Federation)

2013-07-15T23:59:59.000Z

134

Measurement of proton and anti-proton intensities in the Tevatron Collider  

SciTech Connect (OSTI)

This paper describes the techniques used to measure the intensities of the proton (p) and anti-proton ({bar p}) beams in the Tevatron collider. The systems provide simultaneous measurements of the intensity of the 36 proton and 36 antiproton bunches and their longitudinal profiles.

Stephen Pordes et al.

2003-06-04T23:59:59.000Z

135

Diffuse TeV Emission at the Galactic Centre  

E-Print Network [OSTI]

The High-Energy Stereoscopic System (HESS) has detected intense diffuse TeV emission correlated with the distribution of molecular gas along the galactic ridge at the centre of our Galaxy. Earlier HESS observations of this region had already revealed the presence of several point sources at these energies, one of them (HESS J1745-290) coincident with the supermassive black hole Sagittarius A*. It is still not entirely clear what the origin of the TeV emission is, nor even whether it is due to hadronic or leptonic interactions. It is reasonable to suppose, however, that at least for the diffuse emission, the tight correlation of the intensity distribution with the molecular gas indicates a pionic-decay process involving relativistic protons. In this paper, we explore the possible source(s) of energetic hadrons at the galactic centre, and their propagation through a turbulent medium. We conclude that though Sagittarius A* itself may be the source of cosmic rays producing the emission in HESS J1745-290, it cannot be responsible for the diffuse emission farther out. A distribution of point sources, such as pulsar wind nebulae dispersed along the galactic plane, similarly do not produce a TeV emission profile consistent with the HESS map. We conclude that only a relativistic proton distribution accelerated throughout the inter-cloud medium can account for the TeV emission profile measured with HESS.

Elizabeth Wommer; Fulvio Melia; Marco Fatuzzo

2008-04-18T23:59:59.000Z

136

Cadmium Biosorption Rate in Protonated Sargassum Biomass  

E-Print Network [OSTI]

Cadmium Biosorption Rate in Protonated Sargassum Biomass J I N B A I Y A N G A N D B O H U M I L V Sargassum fluitans biomass was accompanied by the release of hydrogen protons from the biomass. The uptake the overall biosorption rate of cadmium ions in flat seaweed biomass particles. The overall biosorption

Volesky, Bohumil

137

Physics at an Upgraded Fermilab Proton Driver  

E-Print Network [OSTI]

In 2004 the Fermilab Long Range Planning Committee identified a new high intensity Proton Driver as an attractive option for the future, primarily motivated by the recent exciting developments in neutrino physics. Over the last few months a physics study has developed the physics case for the Fermilab Proton Driver. The potential physics opportunities are discussed.

S. Geer

2005-07-19T23:59:59.000Z

138

Simulation of proton radiography terminal at IMP  

E-Print Network [OSTI]

Proton radiography is used for advanced hydrotesting as a new type radiography technology due to its powerful penetration capability and high detection efficiency. A new proton radiography terminal will be developed to radiograph static samples at Institute of Modern Physics of Chinese Academy of Science (IMP-CAS). The proton beam with the maximum energy of 2.6 GeV will be produced by Heavy Ion Research Facility in Lanzhou-Cooling Storage Ring (HIRFL-CSR). The proton radiography terminal consists of the matching magnetic lens and the Zumbro lens system. In this paper, the design scheme and all optic parameters of this beam terminal for 2.6GeV proton energy are presented by simulating the beam optics using WINAGILE code. My-BOC code is used to test the particle tracking of proton radiography beam line. Geant4 code and G4beamline code are used for simulating the proton radiography system. The results show that the transmission efficiency of proton without target is 100%, and the effect of secondary particles ca...

Yan, Yan; Huang, Zhi-Wu; Wang, Jie; Yao, Ze-En; Wang, Jun-Run; Wei, Zheng; Yang, Jian-Cheng; Yuan, You-Jin

2015-01-01T23:59:59.000Z

139

Proton conducting ceramic membranes for hydrogen separation  

DOE Patents [OSTI]

A multi-phase proton conducting material comprising a proton-conducting ceramic phase and a stabilizing ceramic phase. Under the presence of a partial pressure gradient of hydrogen across the membrane or under the influence of an electrical potential, a membrane fabricated with this material selectively transports hydrogen ions through the proton conducting phase, which results in ultrahigh purity hydrogen permeation through the membrane. The stabilizing ceramic phase may be substantially structurally and chemically identical to at least one product of a reaction between the proton conducting phase and at least one expected gas under operating conditions of a membrane fabricated using the material. In a barium cerate-based proton conducting membrane, one stabilizing phase is ceria.

Elangovan, S. (South Jordan, UT); Nair, Balakrishnan G. (Sandy, UT); Small, Troy (Midvale, UT); Heck, Brian (Salt Lake City, UT)

2011-09-06T23:59:59.000Z

140

Proton Storage Ring control system  

SciTech Connect (OSTI)

When designing a control system for a new facility, one is faced with a bewildering array of electronic devices to use in the solution. There is, of course, no single correct solution because the constraints are Laboratory- and project-dependent. The major constraint applicable to the hardware choice for the Proton Storage Ring (PSR) control system was the limited manpower available for the design, development, and documentation of custom hardware. As a result, wherever possible, commercial components have been used that are based on recognized standards. The array of choice on the hardware side contrasts markedly with the absence of suitable commercial software products, and it is unfortunate that here there seems to be little prospect of change. The analysis of the overall system that follows will lead to a suitable hardware choice and a description of the software's structure. This paper is an overview, but more information is available.

Clout, P.; Bair, S.; Conley, A.; Ford, R.; Fuka, M.; Greene, N.

1983-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Muon Capture on the Proton  

E-Print Network [OSTI]

The MuCap experiment measures the singlet rate Lambda_S of muon capture on the proton. A negative muon beam is stopped in a time projection chamber filled with ultra-pure hydrogen gas at 10 bar and room temperature. In combination with the surrounding decay electron detectors, the lifetime of muons in hydrogen can be measured to determine LS to a final precision of 1%. The capture rate is then used to derive the nucleon's pseudoscalar form factor gP. Our first-stage result, gP= 7.3\\pm1., will soon be updated with the final analysis of the full statistics reducing the error by a factor of ~2.

P. Winter

2011-10-23T23:59:59.000Z

142

Atomistic Simulation of Water Percolation and Proton Hopping...  

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

Water Percolation and Proton Hopping in Nafion Fuel Cell Membrane. Atomistic Simulation of Water Percolation and Proton Hopping in Nafion Fuel Cell Membrane. Abstract: We have...

143

Computation of the Redox and Protonation Properties of Quinones...  

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

Computation of the Redox and Protonation Properties of Quinones: Towards the Prediction of Redox Cycling Natural Products. Computation of the Redox and Protonation Properties of...

144

Proton Exchange Membrane Fuel Cells for Electrical Power Generation...  

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

Proton Exchange Membrane Fuel Cells for Electrical Power Generation On-Board Commercial Airplanes Proton Exchange Membrane Fuel Cells for Electrical Power Generation On-Board...

145

Conformational Dynamics and Proton Relay Positioning in Nickel...  

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

Dynamics and Proton Relay Positioning in Nickel Catalysts for Hydrogen Production and Oxidation. Conformational Dynamics and Proton Relay Positioning in Nickel Catalysts for...

146

Molecular Dynamics Study of the Proposed Proton Transport Pathways...  

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

Dynamics Study of the Proposed Proton Transport Pathways in FeFe-Hydrogenase. Molecular Dynamics Study of the Proposed Proton Transport Pathways in FeFe-Hydrogenase. Abstract:...

147

Energetics and Dynamics of the Fragmentation Reactions of Protonated...  

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

Protonated Peptides Containing Methionine Sulfoxide or Aspartic Acid Energetics and Dynamics of the Fragmentation Reactions of Protonated Peptides Containing Methionine Sulfoxide...

148

Vehicle Emissions Review - 2011  

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

Emissions Review - 2011 (so far) Tim Johnson October 4, 2011 DOE DEER Conference, Detroit JohnsonTV@Corning.com 2 Summary * California LD criteria emission regs are tightening....

149

NEUTRON EMISSION IN RELATIVISTIC NUCLEAR COLLISIONS  

E-Print Network [OSTI]

Figure Captions Figure l. Neutron-to-proton ratio at 30 labapparent anomalies in the neutron-to-proton fragment ratio.3 proton data. Figure 2. Neutron-to-proton ratio R 1 , Solid

Stevenson, J.D.

2013-01-01T23:59:59.000Z

150

Attosecond neutron Compton scattering from protons  

E-Print Network [OSTI]

The effect of "anomalous" scattering of neutrons and electrons from protons in the electron-volt energy-transfer range is considered, and related experimental results are mentioned. A recent independent confirmation of this effect with a new data analysis procedure is presented. Due to the very short characteristic scattering time, there is no well defined separation of time scales of electronic and protonic motions. An outline of a proposed theoretical interpretation is presented, which is based on the fact that scattering protons represent \\textit{open} quantum systems, thus being subject to decoherence.

C. Aris Chatzidimitriou-Dreismann

2007-02-01T23:59:59.000Z

151

Multiwavelength Thermal Emission  

E-Print Network [OSTI]

Multiwavelength Astronomy NASA #12;Thermal Emission #12;Thermal Emission Non-thermal p-p collisions Optical IR Radio/ Microwave sources of emission massive stars, WHIM, Ly many dust, cool objects-ray ~GeV Gamma-ray ~TeV sources of emission AGN, clusters, SNR, binaries, stars AGN (obscured), shocks

California at Santa Cruz, University of

152

Beta delayed alpha emission from the neutron deficient rare earth isotopes {sup 152}Tm and {sup 150}Ho  

SciTech Connect (OSTI)

The study of beta-delayed proton emission is a well known method to aid the determination of the beta strength distribution in nuclei far from the stability line. At the neutron deficient side of the nuclear chart the process of proton or alpha emission from excited states is energetically allowed when one goes far enough from stability. However, beta-delayed alphas have seldom been measured for nuclei heavier than A = 20. Here we present a study of the beta-delayed alpha-particle emission from {sup 152}Tm and {sup 150}Ho and their importance in the full B(GT) distribution.

Nacher, E. [Instituto de Fisica Corpuscular, CSIC - Univ. de Valencia (Spain); Instituto de Estructura de la Materia, CSIC, Madrid (Spain); Tain, J. L.; Rubio, B.; Algora, A.; Estevez Aguado, M. E.; Gadea, A. [Instituto de Fisica Corpuscular, CSIC - Univ. de Valencia (Spain); Batist, L. [PNPI, Gatchina (Russian Federation); Briz, J. A. [Instituto de Estructura de la Materia, CSIC, Madrid (Spain); Cano-Ott, D. [CIEMAT, Madrid (Spain); Doering, J.; Mukha, I.; Plettner, C.; Roeckl, E. [GSI, Darmstadt (Germany); Gierlik, M.; Janas, Z. [University of Warsaw (Poland)

2011-11-30T23:59:59.000Z

153

Exclusive 0 electroproduction on transversely polarized protons  

E-Print Network [OSTI]

Exclusive 0 electroproduction on transversely polarized protons A. Airapetian,12, 15 N. Akopov,26 Z. Akopov,26 E.C. Aschenauer,6 W. Augustyniak,25 A. Avetissian,26 E. Avetisyan,5 B. Ball,15 N. Bianchi,10 H

154

Resolution of the Proton Spin Problem  

SciTech Connect (OSTI)

A number of lines of investigation into the structure of the nucleon have converged to the point where we believe that one has a consistent explanation of the well known proton spin crisis.

F. Myhrer; A. W. Thomas

2007-09-24T23:59:59.000Z

155

Memory device using movement of protons  

DOE Patents [OSTI]

An enhancement of an electrically written memory element utilizing the motion of protons within a dielectric layer surrounded by layers on either side to confine the protons within the dielectric layer with electrode means attached to the surrounding layers to change the spatial position of the protons within the dielectric layer. The device is preferably constructed as a silicon-silicon dioxide-silicon layered structure with the protons being introduced to the structure during an anneal in an atmosphere containing hydrogen gas. Device operation is enhanced by concluding this anneal step with a sudden cooling. The device operates at low power, is preferably nonvolatile, is radiation tolerant, and is compatible with convention silicon MOS processing for integration with other microelectronics elements on the same silicon substrate.

Warren, William L. (900 N. Randolph St., Arlington, VA 22203); Vanheusden, Karel J. R. (8401 Spain Rd., Albuquerque, NM 87111); Fleetwood, Daniel M. (5513 Estrellita del Norte, NE., Albuquerque, NM 87111); Devine, Roderick A. B. (12 Impasse de la Liberation, 38950 St. Martin le Vinoux, FR); Archer, Leo B. (3108 Vicky Ct., Garland, TX 75044); Brown, George A. (1512 Ridgeview Dr., Arlington, TX 76012-1940); Wallace, Robert M. (428 Park Bend Dr., Richardson, TX 75081)

2000-01-01T23:59:59.000Z

156

Physics at a New Fermilab Proton Driver  

E-Print Network [OSTI]

In 2004, motivated by the recent exciting developments in neutrino physics, the Fermilab Long Range Planning Committee identified a new high intensity Proton Driver as an attractive option for the future. At the end of 2004 the APS ``Study on the Physics of Neutrinos'' concluded that the future U.S. neutrino program should have, as one of its components, ``A proton driver in the megawatt class or above and neutrino superbeam with an appropriate very large detector capable of observing CP violation and measuring the neutrino mass-squared differences and mixing parameters with high precision''. The presently proposed Fermilab Proton Driver is designed to accomplish these goals, and is based on, and would help develop, Linear Collider technology. In this paper the Proton Driver parameters are summarized, and the potential physics program is described.

S. Geer

2006-04-03T23:59:59.000Z

157

Memory device using movement of protons  

DOE Patents [OSTI]

An electrically written memory element is disclosed utilizing the motion of protons within a dielectric layer surrounded by layers on either side to confine the protons within the dielectric layer with electrode means attached to the surrounding layers to change the spatial position of the protons within the dielectric layer. The device is preferably constructed as a silicon-silicon dioxide-silicon layered structure with the protons being introduced to the structure laterally through the exposed edges of the silicon dioxide layer during a high temperature anneal in an atmosphere containing hydrogen gas. The device operates at low power, is preferably nonvolatile, is radiation tolerant, and is compatible with convention silicon MOS processing for integration with other microelectronic elements on the same silicon substrate. With the addition of an optically active layer, the memory element becomes an electrically written, optically read optical memory element. 19 figs.

Warren, W.L.; Vanheusden, K.J.R.; Fleetwood, D.M.; Devine, R.A.B.

1998-11-03T23:59:59.000Z

158

Physics at a new Fermilab proton driver  

SciTech Connect (OSTI)

In 2004, motivated by the recent exciting developments in neutrino physics, the Fermilab Long Range Planning Committee identified a new high intensity Proton Driver as an attractive option for the future. At the end of 2004 the APS ''Study on the Physics of Neutrinos'' concluded that the future US neutrino program should have, as one of its components, ''A proton driver in the megawatt class or above and neutrino superbeam with an appropriate very large detector capable of observing Cp violation and measuring the neutrino mass-squared differences and mixing parameters with high precision''. The presently proposed Fermilab Proton Driver is designed to accomplish these goals, and is based on, and would help develop, Linear Collider technology. In this paper the Proton Driver parameters are summarized, and the potential physics program is described.

Geer, Steve; /Fermilab

2006-04-01T23:59:59.000Z

159

Low energy neutron-proton interactions  

E-Print Network [OSTI]

There have been few measurements of cross sections for neutron-proton scattering and radiative capture below 1 MeV. Those measurements which do exist are at a small number of energies and are often inconsistent with ...

Daub, Brian (Brian Hollenberg)

2012-01-01T23:59:59.000Z

160

Memory device using movement of protons  

DOE Patents [OSTI]

An electrically written memory element utilizing the motion of protons within a dielectric layer surrounded by layers on either side to confine the protons within the dielectric layer with electrode means attached to the surrounding layers to change the spatial position of the protons within the dielectric layer. The device is preferably constructed as a silicon-silicon dioxide-silicon layered structure with the protons being introduced to the structure laterally through the exposed edges of the silicon dioxide layer during a high temperature anneal in an atmosphere containing hydrogen gas. The device operates at low power, is preferably nonvolatile, is radiation tolerant, and is compatible with convention silicon MOS processing for integration with other microelectronic elements on the same silicon substrate. With the addition of an optically active layer, the memory element becomes an electrically written, optically read optical memory element.

Warren, William L. (Albuquerque, NM); Vanheusden, Karel J. R. (Albuquerque, NM); Fleetwood, Daniel M. (Albuquerque, NM); Devine, Roderick A. B. (St. Martin le Vinoux, FR)

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Measurement of the inelastic proton-proton cross section with the ATLAS detector  

SciTech Connect (OSTI)

A measurement of the inelastic proton-proton cross-section at centre-of-mass energy of Central diffraction in proton-proton collisions at {radical}(s) = 7TeV using the ATLAS detector at the Large Hadron Collider is presented. Events are selected by requiring hits in scintillator counters mounted in the forward region of the ATLAS detector and the dataset corresponding to an integrated luminosity of 20{mu}b{sup -1}. In addition, the total cross-section is studied as a function of the rapidity gap size measured with the inner detector and calorimetry.

Zenis, Tibor [Comenius University Bratislava (Slovakia); Collaboration: ATLAS Collaboration

2013-04-15T23:59:59.000Z

162

Investigation of proton focusing and conversion efficiency for proton fast ignition  

E-Print Network [OSTI]

After ignition, a thermonuclear burn wave spreads radiallythe shell to create the thermonuclear burn wave. At 10 keV,heating the plasma to thermonuclear temperatures. Protons

Bartal, Teresa Jean

2012-01-01T23:59:59.000Z

163

Published online 3 October 2002 Electrostatics and proton transfer in photosynthetic  

E-Print Network [OSTI]

where YZ acts as a hydro- gen acceptor for bound water. Only in manganese (Mn) depleted PSII by Mn4/2H2O in micro- to milliseconds. By sequential absorption of four quanta, causing one electron

Steinhoff, Heinz-Jürgen

164

Direct Refinement against ProtonProton Dipolar Couplings in NMR Structure Determination of Macromolecules  

E-Print Network [OSTI]

Direct Refinement against Proton­Proton Dipolar Couplings in NMR Structure Determination in macromolecular structure refinement are pre- sented. Potentials are described for direct refinement against 1 H­1 dipolar coupling refinement is illustrated using the small protein ubiquitin. It is shown that direct 1 H

Clore, G. Marius

165

$?$ and $?$ Production in Proton-Proton Collisions at E=13 TeV  

E-Print Network [OSTI]

This article is an extension of our recent studies of $\\Psi$ and $\\Upsilon$ production cross sections in proton-proton collisions at the LHC with E=$\\sqrt{s}$=8.0 TeV to E=13 TeV

Leonard S. Kisslinger; Debasish Das

2015-02-02T23:59:59.000Z

166

Clustering phenomena from two-particle angular correlations in proton-proton and heavy ion collisions  

E-Print Network [OSTI]

Results on two-particle angular correlations in proton-proton (/-s = 200 and 410 GeV) ,Cu+Cu and Au+Au collisions (js = 200 GeV) are presented over a broad range of pseudorapidity ([eta]) and azimuthal angle ([phi]). The ...

Li, Wei, Ph. D. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

167

BP's Perspective on Emissions Purdue Emissions Trading Workshop  

E-Print Network [OSTI]

BP's Perspective on Emissions Trading Purdue Emissions Trading Workshop April 30, 2010 Mark - Government policies can create a carbon price via three primary mechanisms: - Emissions trading (BP's strong

168

Excess Emissions (New Mexico)  

Broader source: Energy.gov [DOE]

This regulation establishes requirements for a source whose operation results in an excess emission and to establish criteria for a source whose operation results in an excess emission to claim an...

169

A Detector for Proton Computed Tomography  

SciTech Connect (OSTI)

Radiation therapy is a widely recognized treatment for cancer. Energetic protons have distinct features that set them apart from photons and make them desirable for cancer therapy as well as medical imaging. The clinical interest in heavy ion therapy is due to the fact that ions deposit almost all of their energy in a sharp peak the Bragg peak- at the very end of their path. Proton beams can be used to precisely localize a tumor and deliver an exact dose to the tumor with small doses to the surrounding tissue. Proton computed tomography (pCT) provides direct information on the location on the target tumor, and avoids position uncertainty caused by treatment planning based on imaging with X-ray CT. The pCT project goal is to measure and reconstruct the proton relative stopping power distribution directly in situ. To ensure the full advantage of cancer treatment with 200 MeV proton beams, pCT must be realized.

Blazey, G.; et al.,

2013-12-06T23:59:59.000Z

170

Energy Production Demonstrator for Megawatt Proton Beams  

E-Print Network [OSTI]

A preliminary study of the Energy Production Demonstrator (EPD) concept - a solid heavy metal target irradiated by GeV-range intense proton beams and producing more energy than consuming - is carried out. Neutron production, fission, energy deposition, energy gain, testing volume and helium production are simulated with the MARS15 code for tungsten, thorium, and natural uranium targets in the proton energy range 0.5 to 120 GeV. This study shows that the proton energy range of 2 to 4 GeV is optimal for both a natU EPD and the tungsten-based testing station that would be the most suitable for proton accelerator facilities. Conservative estimates, not including breeding and fission of plutonium, based on the simulations suggest that the proton beam current of 1 mA will be sufficient to produce 1 GW of thermal output power with the natU EPD while supplying < 8% of that power to operate the accelerator. The thermal analysis shows that the concept considered has a problem due to a possible core meltdown; however...

Pronskikh, Vitaly S; Novitski, Igor; Tyutyunnikov, Sergey I

2014-01-01T23:59:59.000Z

171

Energy Production Demonstrator for Megawatt Proton Beams  

E-Print Network [OSTI]

A preliminary study of the Energy Production Demonstrator (EPD) concept - a solid heavy metal target irradiated by GeV-range intense proton beams and producing more energy than consuming - is carried out. Neutron production, fission, energy deposition, energy gain, testing volume and helium production are simulated with the MARS15 code for tungsten, thorium, and natural uranium targets in the proton energy range 0.5 to 120 GeV. This study shows that the proton energy range of 2 to 4 GeV is optimal for both a natU EPD and the tungsten-based testing station that would be the most suitable for proton accelerator facilities. Conservative estimates, not including breeding and fission of plutonium, based on the simulations suggest that the proton beam current of 1 mA will be sufficient to produce 1 GW of thermal output power with the natU EPD while supplying < 8% of that power to operate the accelerator. The thermal analysis shows that the concept considered has a problem due to a possible core meltdown; however, a number of approaches (a beam rastering, in first place) are suggested to mitigate the issue. The efficiency of the considered EPD as a Materials Test Station (MTS) is also evaluated in this study.

Vitaly S. Pronskikh; Nikolai Mokhov; Igor Novitski; Sergey I. Tyutyunnikov

2014-07-16T23:59:59.000Z

172

Emissions Trading and Social Justice  

E-Print Network [OSTI]

David M. Driesen, Does Emissions Trading Encourage Jason Coburn, Emissions Trading and Environmental Szambelan, U.S. Emissions Trading Markets for SO 2

Farber, Daniel A

2011-01-01T23:59:59.000Z

173

Binary Pulsar Shock Emissions as Galactic Gamma-Ray Sources  

E-Print Network [OSTI]

We address several issues regarding the interpretation of galactic \\ggg-ray sources. We consider powerful pulsars in binaries producing X-ray and gamma-ray {\\it unpulsed} emission from the shock interaction of relativistic pulsar winds with circumbinary material. Nebular mass outflows from companion stars of binary pulsars can provide the right {\\it calorimeters} to transform a fraction of the electromagnetic and kinetic energy of pulsar winds into high energy radiation. We discuss the physics of interaction of relativistic pulsar winds with gaseous material and show that the conditions in pulsar binary systems might be ideal to constrain shock acceleration mechanisms and pulsar wind composition and structure. We briefly discuss the example of the 47~ms pulsar PSR~1259-63 orbiting around a massive Be~star companion and monitored by X-ray and gamma-ray instruments during its recent periastron passage. In addition to young pulsars in massive binaries, also a class of recycled millisecond pulsars in low-mass binaries can be interesting high energy emitters.

M. Tavani

1995-02-13T23:59:59.000Z

174

Multiparticle interactions in backward proton production, subthreshold antiproton production, and inclusive electron scattering from nuclei  

SciTech Connect (OSTI)

The phenomena of backward proton emission and subthreshold antiproton production in the proton-nucleus interactions, and findings from the inclusive scattering of electrons from nuclei, are interpreted in terms of multiparticle interactions. Rates for multiparticle collisions are calculated using the results from many-body theory, with the products of the squared interaction amplitudes and Wigner functions. The rates for the processes with different number of particles are proportional to the different powers of spatial density. The many-body amplitudes are expanded in terms of propagators and elementary amplitudes with only two particles in the initial state. The leading processes are isolated on a tree level. They correspond to the expansion of a ground-state nuclear wave function. Reasonable agreement with data is obtained.

Danielewicz, P. (National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI (USA) Department of Physics Astronomy, Michigan State University, East Lansing, MI (USA))

1990-10-01T23:59:59.000Z

175

Polarization measurement of laser-accelerated protons  

SciTech Connect (OSTI)

We report on the successful use of a laser-driven few-MeV proton source to measure the differential cross section of a hadronic scattering reaction as well as on the measurement and simulation study of polarization observables of the laser-accelerated charged particle beams. These investigations were carried out with thin foil targets, illuminated by 100 TW laser pulses at the Arcturus laser facility; the polarization measurement is based on the spin dependence of hadronic proton scattering off nuclei in a Silicon target. We find proton beam polarizations consistent with zero magnitude which indicates that for these particular laser-target parameters the particle spins are not aligned by the strong magnetic fields inside the laser-generated plasmas.

Raab, Natascha; Engels, Ralf; Engin, Ilhan; Greven, Patrick; Holler, Astrid; Lehrach, Andreas; Maier, Rudolf [Institut fr Kernphysik and Jlich Center for Hadron Physics, Forschungszentrum Jlich, 52425 Jlich (Germany)] [Institut fr Kernphysik and Jlich Center for Hadron Physics, Forschungszentrum Jlich, 52425 Jlich (Germany); Bscher, Markus, E-mail: m.buescher@fz-juelich.de [Institut fr Kernphysik and Jlich Center for Hadron Physics, Forschungszentrum Jlich, 52425 Jlich (Germany) [Institut fr Kernphysik and Jlich Center for Hadron Physics, Forschungszentrum Jlich, 52425 Jlich (Germany); Peter Grnberg Institut (PGI-6), Forschungszentrum Jlich, 52425 Jlich (Germany); Institute for Laser- and Plasma Physics, Heinrich-Heine Universitt Dsseldorf, Universittsstr. 1, 40225 Dsseldorf (Germany); Cerchez, Mirela; Swantusch, Marco; Toncian, Monika; Toncian, Toma; Willi, Oswald [Institute for Laser- and Plasma Physics, Heinrich-Heine Universitt Dsseldorf, Universittsstr. 1, 40225 Dsseldorf (Germany)] [Institute for Laser- and Plasma Physics, Heinrich-Heine Universitt Dsseldorf, Universittsstr. 1, 40225 Dsseldorf (Germany); Gibbon, Paul; Karmakar, Anupam [Institute for Advanced Simulation, Jlich Supercomputing Centre, Forschungszentrum Jlich, 52425 Jlich (Germany)] [Institute for Advanced Simulation, Jlich Supercomputing Centre, Forschungszentrum Jlich, 52425 Jlich (Germany)

2014-02-15T23:59:59.000Z

176

Regulation of GHG emissions from transportation fuels: Emission quota versus emission intensity standard  

E-Print Network [OSTI]

Derivation of average cost of emission reduction by blending?) and ? respectively. GHG emissions per unit of blend is, ?+ ?? i Reduction in GHG emissions with respect to unblended

Rajagopal, Deepak

2010-01-01T23:59:59.000Z

177

Lorentz Coherence and the Proton Form Factor  

E-Print Network [OSTI]

The dipole cutoff behavior for the proton form factor has been and still is one of the major issues in high-energy physics. It is shown that this dipole behavior comes from the coherence between the Lorentz contraction of the proton size and the decreasing wavelength of the incoming photon signal. The contraction rates are the same for both cases. This form of coherence is studied also in the momentum-energy space. The coherence effect in this space can be explained in terms of two overlapping wave functions.

Kim, Young S

2015-01-01T23:59:59.000Z

178

Single Spin Asymmetries in Proton-Proton and Proton-Neutron Scattering at 820 GeV  

E-Print Network [OSTI]

The physics case is summarised for the investigation of high energy spin phenomena by placing an internal polarised target into HERA's unpolarised proton beam. The luminosity and experimental sensitivity are discussed. Estimating the physics reach of single spin asymmetries in different final states reveals a considerable physics potential in testing the spin sector of perturbative QCD.

Wolf-Dieter Nowak

1995-01-11T23:59:59.000Z

179

Non-thermal emission from Galaxy Clusters and future observations with the FERMI gamma-ray telescope and LOFAR  

E-Print Network [OSTI]

FERMI (formely GLAST) and LOFAR will shortly provide crucial information on the non-thermal components (relativistic particles and magnetic field) in galaxy clusters. After discussing observational facts that already put constraints on the properties and origin of non-thermal components, I will report on the emission spectrum from galaxy clusters as expected in the context of general calculations in which relativistic particles (protons and secondary electrons due to proton-proton collisions) interact with MHD turbulence generated in the cluster volume during cluster-cluster mergers. In this scenario (known as re-acceleration scenario) diffuse cluster-scale radio emission is produced in massive clusters during merging events, while gamma ray emission, at some level, is expected to be common in clusters. Expectations of interest for LOFAR and FERMI are also briefly discussed.

G. Brunetti

2008-10-03T23:59:59.000Z

180

Fan-beam intensity modulated proton therapy  

SciTech Connect (OSTI)

Purpose: This paper presents a concept for a proton therapy system capable of delivering intensity modulated proton therapy using a fan beam of protons. This system would allow present and future gantry-based facilities to deliver state-of-the-art proton therapy with the greater normal tissue sparing made possible by intensity modulation techniques.Methods: A method for producing a divergent fan beam of protons using a pair of electromagnetic quadrupoles is described and particle transport through the quadrupole doublet is simulated using a commercially available software package. To manipulate the fan beam of protons, a modulation device is developed. This modulator inserts or retracts acrylic leaves of varying thickness from subsections of the fan beam. Each subsection, or beam channel, creates what effectively becomes a beam spot within the fan area. Each channel is able to provide 0255 mm of range shift for its associated beam spot, or stop the beam and act as an intensity modulator. Results of particle transport simulations through the quadrupole system are incorporated into the MCNPX Monte Carlo transport code along with a model of the range and intensity modulation device. Several design parameters were investigated and optimized, culminating in the ability to create topotherapy treatment plans using distal-edge tracking on both phantom and patient datasets.Results: Beam transport calculations show that a pair of electromagnetic quadrupoles can be used to create a divergent fan beam of 200 MeV protons over a distance of 2.1 m. The quadrupole lengths were 30 and 48 cm, respectively, with transverse field gradients less than 20 T/m, which is within the range of water-cooled magnets for the quadrupole radii used. MCNPX simulations of topotherapy treatment plans suggest that, when using the distal edge tracking delivery method, many delivery angles are more important than insisting on narrow beam channel widths in order to obtain conformal target coverage. Overall, the sharp distal falloff of a proton depth-dose distribution was found to provide sufficient control over the dose distribution to meet objectives, even with coarse lateral resolution and channel widths as large as 2 cm. Treatment plans on both phantom and patient data show that dose conformity suffers when treatments are delivered from less than approximately ten angles. Treatment time for a sample prostate delivery is estimated to be on the order of 10 min, and neutron production is estimated to be comparable to that found for existing collimated systems.Conclusions: Fan beam proton therapy is a method of delivering intensity modulated proton therapy which may be employed as an alternative to magnetic scanning systems. A fan beam of protons can be created by a set of quadrupole magnets and modified by a dual-purpose range and intensity modulator. This can be used to deliver inversely planned treatments, with spot intensities optimized to meet user defined dose objectives. Additionally, the ability of a fan beam delivery system to effectively treat multiple beam spots simultaneously may provide advantages as compared to spot scanning deliveries.

Hill, Patrick [Department of Radiation Oncology, University of Iowa Hospitals and Clinics, Iowa City, Iowa 52242 (United States)] [Department of Radiation Oncology, University of Iowa Hospitals and Clinics, Iowa City, Iowa 52242 (United States); Westerly, David [Department of Radiation Oncology, University of Colorado School of Medicine, Aurora, Colorado 80045 (United States)] [Department of Radiation Oncology, University of Colorado School of Medicine, Aurora, Colorado 80045 (United States); Mackie, Thomas [Medical Devices, Morgridge Institute for Research, University of Wisconsin, Madison, Wisconsin 53715 (United States)] [Medical Devices, Morgridge Institute for Research, University of Wisconsin, Madison, Wisconsin 53715 (United States)

2013-11-15T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Comparison of Source Images for protons, $?^-$'s and $?$'s in 6 AGeV Au+Au collisions  

E-Print Network [OSTI]

Source images are extracted from two-particle correlations constructed from strange and non-strange hadrons produced in 6 AGeV Au + Au collisions. Very different source images result from pp vs p$\\Lambda$ vs $\\pi^-\\pi^-$ correlations. These observations suggest important differences in the space-time emission histories for protons, pions and neutral strange baryons produced in the same events.

P. Chung; N. N. Ajitanand; J. M. Alexander; M. Anderson; D. Best; F. P. Brady; T. Case; W. Caskey; D. Cebra; J. L. Chance; B. Cole; K. Crowe; A. C. Das; J. E. Draper; M. L. Gilkes; S. Gushue; M. Heffner; A. S. Hirsch; E. L. Hjort; L. Huo; M. Justice; M. Kaplan; D. Keane; J. C. Kintner; J. Klay; D. Krofcheck; R. A. Lacey; J. Lauret; M. A. Lisa; H. Liu; Y. M. Liu; R. McGrath; Z. Milosevich; G. Odyniec; D. L. Olson; S. Panitkin; N. T. Porile; G. Rai; H. G. Ritter; J. L. Romero; R. Scharenberg; B. Srivastava; N. T. B Stone; T. J. M. Symons; J. Whitfield; R. Witt; L. Wood; W. N. Zhang; D. Brown; S. Pratt; F. Wang; P. Danielewicz

2003-07-16T23:59:59.000Z

182

The Path a Proton Takes Through a Fuel Cell Membrane  

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

Path a Proton Takes Through a Fuel Cell Membrane The Path a Proton Takes Through a Fuel Cell Membrane October 11, 2012 | Tags: Basic Energy Sciences (BES), Chemistry, Franklin,...

183

amide proton resonances: Topics by E-print Network  

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

(IHRP funded by NHMFL) Citation: Da Wang, Kerim Gulyuz, Corey N 8 Exclusive ? production in proton-proton collisions in the resonance model Nuclear Theory (arXiv) Summary:...

184

Small Business Innovation Research Award Success Story: Proton Energy Systems  

Fuel Cell Technologies Publication and Product Library (EERE)

This success story describes Proton Energy Systems, a small business that designs and manufactures proton exchange membrane (PEM) electrolysis sytems to produce hydrogen from water. The U.S. Departmen

185

Anomalous Microwave Emission  

E-Print Network [OSTI]

Improved knowledge of diffuse Galactic emission is important to maximize the scientific return from scheduled CMB anisotropy missions. Cross-correlation of microwave maps with maps of the far-IR dust continuum show a ubiquitous microwave emission component whose spatial distribution is traced by far-IR dust emission. The spectral index of this emission, beta_{radio} = -2.2 (+0.5 -0.7) is suggestive of free-free emission but does not preclude other candidates. Comparison of H-alpha and microwave results show that both data sets have positive correlations with the far-IR dust emission. Microwave data, however, are consistently brighter than can be explained solely from free-free emission traced by H-alpha. This ``anomalous'' microwave emission can be explained as electric dipole radiation from small spinning dust grains. The anomalous component at 53 GHz is 2.5 times as bright as the free-free emission traced by H-alpha, providing an approximate normalization for models with significant spinning dust emission.

A. Kogut

1999-02-22T23:59:59.000Z

186

Proton recoil scintillator neutron rem meter  

DOE Patents [OSTI]

A neutron rem meter utilizing proton recoil and thermal neutron scintillators to provide neutron detection and dose measurement. In using both fast scintillators and a thermal neutron scintillator the meter provides a wide range of sensitivity, uniform directional response, and uniform dose response. The scintillators output light to a photomultiplier tube that produces an electrical signal to an external neutron counter.

Olsher, Richard H. (Los Alamos, NM); Seagraves, David T. (Los Alamos, NM)

2003-01-01T23:59:59.000Z

187

High Power Proton Accelerators: Capabilities and  

E-Print Network [OSTI]

;Charge neutral deeply penetrating Li motion in fuel cells Help build electric cars Nuclear scattering-Battelle for the U.S. Department of Energy "Rough" Outline · Why high power proton accelerators? · Brief introduction energy to probe for smaller and smaller particles. The SNS is part of class of accelerators called

Tennessee, University of

188

DYNAMIC MODELING PROTON EXCHANGE MEMBRANE FUEL CELL  

E-Print Network [OSTI]

DYNAMIC MODELING PROTON EXCHANGE MEMBRANE FUEL CELL OVERVIEW Current/Completed Plug Power reformer from GE Use of GenCore to investigate effects of fuel quality and dynamic changes in fuel to garner SCAQMD funding for fuel cell testing GenCore system is sensitive to diluents As built design

Mease, Kenneth D.

189

PROTON RADIOGRAPHY FOR AN ADVANCED HYDROTEST FACILITY  

SciTech Connect (OSTI)

Analysis of data from BNL experiment 933 is presented. Results demonstrate that proton radiography can meet many of the requirements for an Advanced Hydrotest Facility (AHF). Results for background, position resolution, metrology, quantitative radiography, material identification, and edge resolution are presented.

C. MORRIS

2000-11-01T23:59:59.000Z

190

anti-proton proton annihilation: Topics by E-print Network  

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

24 25 Next Page Last Page Topic Index 1 Anti-proton and positron Cosmic Rays from Dark Matter annihilation around Intermediate Mass Black Holes Astrophysics (arXiv) Summary:...

191

Measurement of the analysing power in proton-proton elastic scattering at small angles  

E-Print Network [OSTI]

The proton analysing power in $\\vec{p}p$ elastic scattering has been measured at small angles at COSY-ANKE at 796 MeV and five other beam energies between 1.6 and 2.4 GeV using a polarised proton beam. The asymmetries obtained by detecting the fast proton in the ANKE forward detector or the slow recoil proton in a silicon tracking telescope are completely consistent. Although the analysing power results agree well with the many published data at 796 MeV, and also with the most recent partial wave solution at this energy, the ANKE data at the higher energies lie well above the predictions of this solution at small angles. An updated phase shift analysis that uses the ANKE results together with the World data leads to a much better description of these new measurements.

Z. Bagdasarian; D. Chiladze; S. Dymov; A. Kacharava; G. Macharashvili; S. Barsov; R. Gebel; B. Gou; M. Hartmann; I. Keshelashvili; A. Khoukaz; P. Kulessa; A. Kulikov; A. Lehrach; N. Lomidze; B. Lorentz; R. Maier; D. Mchedlishvili; S. Merzliakov; S. Mikirtychyants; M. Nioradze; H. Ohm; M. Papenbrock; D. Prasuhn; F. Rathmann; V. Serdyuk; V. Shmakova; R. Stassen; H. Stockhorst; I. I. Strakovsky; H. Strher; M. Tabidze; A. Tschner; S. Trusov; D. Tsirkov; Yu. Uzikov; Yu. Valdau; C. Wilkin; R. L. Workman

2014-10-28T23:59:59.000Z

192

Investigation of Transient Phenomena of Proton Exchange Membrane Fuel Cells  

E-Print Network [OSTI]

Investigation of Transient Phenomena of Proton Exchange Membrane Fuel Cells by Roongrojana of Proton Exchange Membrane Fuel Cells by Roongrojana Songprakorp BSc, Prince of Songkhla University to the modeling and under- standing of the dynamic behavior of proton exchange membrane fuel cells (PEMFCs

Victoria, University of

193

Development of Reversible Fuel Cell Systems at Proton Energy  

E-Print Network [OSTI]

/DOE Reversible Fuel Cell Workshop 5 Proton OnSite · Manufacturer of Proton Exchange Membrane (PEM) hydrogen Fuel Cell Workshop PEM Cell Stacks Complete Systems 6 Proton Capabilities · Complete product/DOE Reversible Fuel Cell Workshop 9 PEM Fuel Cell & Electrolysis · Humidified gas streams vs. liquid water

194

Observation of O++++ 4 lines in proton aurora over Svalbard  

E-Print Network [OSTI]

Observation of O++++ 4 P-4 D0 lines in proton aurora over Svalbard N. Ivchenko,1,2 M. Galand,3 B. S March 2004; accepted 26 March 2004; published 29 May 2004. [1] Spectra of a proton aurora event show electron aurora. Conjugate satellite particle measurements are used as input to electron and proton

Lummerzheim, Dirk

195

Spectral imaging of proton aurora and twilight at Troms, Norway  

E-Print Network [OSTI]

Spectral imaging of proton aurora and twilight at Troms, Norway M. Galand,1 J. Baumgardner,1 D, which offers a unique opportunity to investigate the Ha to Hb Balmer decrement in proton aurora locations (Troms, Poker Flat, Svalbard) in proton aurora is presented. Lummerzheim and Galand [2001] find

Lummerzheim, Dirk

196

Electron and proton aurora observed spectroscopically in the far ultraviolet  

E-Print Network [OSTI]

Electron and proton aurora observed spectroscopically in the far ultraviolet M. Galand,1 D the location of the electron and proton aurorae is discussed. The estimation of the particle characteristics aurora. Because protons and electrons do not interact in the same way with the atmosphere, our study

Lummerzheim, Dirk

197

Exclusive photoproduction of J/psi and psi(2S) states in proton-proton collisions at the CERN LHC  

E-Print Network [OSTI]

In this work we investigate the exclusive photoproduction of J/psi and the radially excited psi(2S) state off nucleon in proton-proton collisions. The theoretical framework considered in the analysis is the light-cone dipole formalism and predictions are done for proton-proton collisions at the CERN-LHC energy of 7 TeV. The theoretical uncertainties are investigated and comparison is done to the recent LHCb Collaboration data for the exclusive charmonium production.

M. B. Gay Ducati; M. T. Griep; M. V. T. Machado

2014-06-18T23:59:59.000Z

198

Saving Fuel, Reducing Emissions  

E-Print Network [OSTI]

would in turn lower PHEV fuel costs and make them morestretches from fossil-fuel- powered conventional vehiclesbraking, as do Saving Fuel, Reducing Emissions Making Plug-

Kammen, Daniel M.; Arons, Samuel M.; Lemoine, Derek M.; Hummel, Holmes

2009-01-01T23:59:59.000Z

199

Vehicle Emissions Review - 2012  

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

Vehicle Emissions Review - 2012 Tim Johnson October 16, 2012 2 Environmental Technologies Summary * Regulations - LEVIII finalized, Tier 3? RDE in Europe developing and very...

200

Observation of solar high energy gamma and X-ray emission and solar energetic particles  

E-Print Network [OSTI]

We considered 18 solar flares observed between June 2010 and July 2012, in which high energy >100 MeV {\\gamma}-emission was registered by the Large Area Telescope (LAT) aboard FermiGRO. We examined for these {\\gamma}-events soft X-ray observations by GOES, hard X-ray observations by the Anti-Coincidence Shield of the SPectrometer aboard INTEGRAL (ACS SPI) and the Gamma-Ray burst Monitor (GBM) aboard FermiGRO. Hard X-ray and {\\pi}0-decay {\\gamma}-ray emissions are used as tracers of electron and proton acceleration, respectively. Bursts of hard X-ray were observed by ACS SPI during impulsive phase of 13 events. Bursts of hard X-ray >100 keV were not found during time intervals, when prolonged hard {\\gamma}-emission was registered by LAT/FermiGRO. Those events showing prolonged high-energy gamma-ray emission not accompanied by >100 keV hard X-ray emission are interpreted as an indication of either different acceleration processes for protons and electrons or as the presence of a proton population accelerated du...

Struminsky, Alexei

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Kinetics of proton pumping in cytochrome c oxidase  

E-Print Network [OSTI]

We propose a simple model of cytochrome c oxidase, including four redox centers and four protonable sites, to study the time evolution of electrostatically coupled electron and proton transfers initiated by the injection of a single electron into the enzyme. We derive a system of master equations for electron and proton state probabilities and show that an efficient pumping of protons across the membrane can be obtained for a reasonable set of parameters. All four experimentally observed kinetic phases appear naturally from our model. We also calculate the dependence of the pumping efficiency on the transmembrane voltage at different temperatures and discuss a possible mechanism of the redox-driven proton translocation.

Anatoly Yu. Smirnov; Lev G. Mourokh; Franco Nori

2009-12-04T23:59:59.000Z

202

Production of $K^-$-mesons in proton-proton and proton-nucleus interactions at various energies  

E-Print Network [OSTI]

The experimental data on the production of $K^-$-mesons in pp-collisions are analyzed and a method of the unified description of these data in a broad energy range for primary protons is proposed. The $K^-$-mesons production in pA-collisions is considered. The simple formulas for inclusive cross sections of the $K^-$ production in these collisions are given. The results of the calculations by these formulas are compared with the available experimental data.

S. V. Efremov; E. Ya. Paryev

1995-07-17T23:59:59.000Z

203

Air Emission Inventory for the INEEL -- 1999 Emission Report  

SciTech Connect (OSTI)

This report presents the 1999 calendar year update of the Air Emission Inventory for the Idaho National Engineering and Environmental Laboratory (INEEL). The INEEL Air Emission Inventory documents sources and emissions of nonradionuclide pollutants from operations at the INEEL. The report describes the emission inventory process and all of the sources at the INEEL, and provides nonradionuclide emissions estimates for stationary sources.

Zohner, Steven K

2000-05-01T23:59:59.000Z

204

Forster mechanism of electron-driven proton pump  

E-Print Network [OSTI]

We examine a simple model of proton pumping through the inner membrane of mitochondria in the living cell. We demonstrate that the pumping process can be described using approaches of condensed matter physics. In the framework of this model, we show that the resonant F\\"orster-type energy exchange due to electron-proton Coulomb interaction can provide an unidirectional flow of protons against an electrochemical proton gradient, thereby accomplishing proton pumping. The dependence of this effect on temperature as well as electron and proton voltage build-ups are obtained taking into account electrostatic forces and noise in the environment. We find that the proton pump works with maximum efficiency in the range of temperatures and transmembrane electrochemical potentials which correspond to the parameters of living cells.

Anatoly Yu. Smirnov; Lev G. Mourokh; Franco Nori

2007-11-08T23:59:59.000Z

205

Shuttle-mediated proton pumping across the inner mitochondrial membrane  

E-Print Network [OSTI]

Shuttle-assisted charge transfer is pivotal for the efficient energy transduction from the food-stuff electrons to protons in the respiratory chain of animal cells and bacteria. The respiratory chain consists of four metalloprotein Complexes (I-IV) embedded in the inner membrane of a mitochondrion. Three of these complexes pump protons across the membrane, fuelled by the energy of food-stuff electrons. Despite extensive biochemical and biophysical studies, the physical mechanism of this proton pumping is still not well understood. Here we present a nanoelectromechanical model of the electron-driven proton pump related to the second loop of the respiratory chain, where a lipid-soluble ubiquinone molecule shuttles between the Complex I and Complex III, carrying two electrons and two protons. We show that the energy of electrons can be converted to the transmembrane proton potential gradient via the electrostatic interaction between electrons and protons on the shuttle. We find that the system can operate either...

Smirnov, Anatoly Yu; Nori, Franco

2008-01-01T23:59:59.000Z

206

Radio Synchrotron Emission from Secondary Leptons in the Vicinity of Sgr A*  

E-Print Network [OSTI]

A point-like source of ~TeV gamma-rays has recently been seen towards the Galactic center by HESS and other air Cerenkov telescopes. In recent work (Ballantyne et al. 2007), we demonstrated that these gamma-rays can be attributed to high-energy protons that (i) are accelerated close to the event horizon of the central black hole, Sgr A*, (ii) diffuse out to ~pc scales, and (iii) finally interact to produce gamma-rays. The same hadronic collision processes will necessarily lead to the creation of electrons and positrons. Here we calculate the synchrotron emissivity of these secondary leptons in the same magnetic field configuration through which the initiating protons have been propagated in our model. We compare this emission with the observed ~GHz radio spectrum of the inner few pc region which we have assembled from archival data and new measurements we have made with the Australia Telescope Compact Array. We find that our model predicts secondary synchrotron emission with a steep slope consistent with the observations but with an overall normalization that is too large by a factor of ~ 2. If we further constrain our theoretical gamma-ray curve to obey the implicit EGRET upper limit on emission from this region we predict radio emission that is consistent with observations, i.e., the hadronic model of gamma ray emission can, simultaneously and without fine-tuning, also explain essentially all the diffuse radio emission detected from the inner few pc of the Galaxy.

Roland M. Crocker; David Jones; David R. Ballantyne; Fulvio Melia

2007-08-07T23:59:59.000Z

207

Optimization parameter design for proton irradiation accelerator  

E-Print Network [OSTI]

The proton irradiation accelerator is widely founded for industry application, and should be designed as compact, reliable, and easy operate. A 10 MeV proton beam is designed to be injected into the slow circulation ring with the repetition rate of 0.5 Hz for accumulation and acceleration, and then the beam with the energy of 300MeV will be slowly extracted by third order resonance method. For getting a higher intensity and more uniform beam, the height of the injection bump is carefully optimised during the injection period. Besides, in order to make the extracted beam with a more uniform distribution, a RF Knock-out method is adopted, and the RF kicker's amplitude is well optimised.

Yu-Wen An; Hong-Fei Ji; Sheng Wang; Shou-Yan Xu

2014-11-20T23:59:59.000Z

208

Future High-Intensity Proton Accelerators  

E-Print Network [OSTI]

This paper provides an overview of currently planned high-intensity proton accelerators. While for high energies (>10GeV) synchrotrons remain the preferred tools to produce high-intensity beams, recent years have seen an impressive development of linac-based lower-energy (intensity proton drivers for spallation sources, accelerator driven systems (ADS), production of Radioactive Ion Beams (RIB) and various neutrino applications (beta-beam, superbeam, neutrino factory). This paper discusses the optimum machine types for the various beam requirements and uses a range of projects, which are likely to be realised within the coming decade, to illustrate the different approaches to reach high average beam power with the application-specific time structure. Only machines with a beam power above 100kW are considered.

Gerigk, F

2007-01-01T23:59:59.000Z

209

Semiclassical study on Proton and Neutron  

E-Print Network [OSTI]

Starting from the existing semiclassical studies on hydrogenoid atoms, we propose a similar intuitive exercise for the three-body quark systems corresponding to protons and neutrons. In the frame of this toy model we try to explain both the stabilities of proton and neutron with respect to the nuclear interaction, and the spectrum of nucleonic resonances with J=1/2. Our choice is motivated also by a good agreement obtained for the up and down quark rest masses report. Taking into account the deterministic chaotic behavior of many-body systems, the discussed exercise could be understood as an interesting particular case of a quantum three-body problem which admits a semiclassical treatment.

I. V. Grossu; C. Besliu; Al. Jipa; D. Felea; C. C. Bordeianu

2007-02-16T23:59:59.000Z

210

Spontaneous Emission Rate Enhancement Using Optical Antennas  

E-Print Network [OSTI]

of Spontaneous Emission in a Semiconductor nanoLED, emission rate enhancement using the Fluorescent Emission by Lattice Resonances in

Kumar, Nikhil

2013-01-01T23:59:59.000Z

211

Contraction & Convergence: UK carbon emissions and the  

E-Print Network [OSTI]

the EU's emissions trading scheme will do little to mitigate carbon emissions 4) Aviation growth must emissions. Keywords Contraction & Convergence; aviation; emissions trading; passengers; carbon dioxide #12

Watson, Andrew

212

Emission Abatement System  

DOE Patents [OSTI]

Emission abatement system. The system includes a source of emissions and a catalyst for receiving the emissions. Suitable catalysts are absorber catalysts and selective catalytic reduction catalysts. A plasma fuel converter generates a reducing gas from a fuel source and is connected to deliver the reducing gas into contact with the absorber catalyst for regenerating the catalyst. A preferred reducing gas is a hydrogen rich gas and a preferred plasma fuel converter is a plasmatron. It is also preferred that the absorber catalyst be adapted for absorbing NO.sub.x.

Bromberg, Leslie (Sharon, MA); Cohn, Daniel R. (Chestnut Hill, MA); Rabinovich, Alexander (Swampscott, MA)

2003-05-13T23:59:59.000Z

213

Nuclear like effects in proton-proton collisions at high energy  

E-Print Network [OSTI]

We show that several effects considered nuclear effects are not nuclear in the sense that they do not only occur in nucleus-nucleus and hadron-nucleus collisions but, as well, they are present in hadron-hadron (proton-proton) collisions. The matter creation mechanism in hh, hA and AA collisions is always the same. The pT suppression of particles produced in large multiplicity events compared to low multiplicity events, the elliptic flow and the Cronin effect are predicted to occur in pp collisions at LHC energies as a consequence of the obtained high density partonic medium.

L. Cunqueiro; J. Dias de Deus; C. Pajares

2009-09-17T23:59:59.000Z

214

Emission Standards for Contaminants (Iowa)  

Broader source: Energy.gov [DOE]

These regulations list emissions standards for various contaminants, and contain special requirements for anaerobic lagoons. These regulations also describe alternative emissions limits, which may...

215

The Dependence of the Proton-Triton Nuclear Reaction Rate on the Temperature and Energy Content of the High-Energy Proton Distribution Function  

E-Print Network [OSTI]

The Dependence of the Proton-Triton Nuclear Reaction Rate on the Temperature and Energy Content of the High-Energy Proton Distribution Function

216

Intelligent field emission arrays  

E-Print Network [OSTI]

Field emission arrays (FEAs) have been studied extensively as potential electron sources for a number of vacuum microelectronic device applications. For most applications, temporal current stability and spatial current ...

Hong, Ching-yin, 1973-

2003-01-01T23:59:59.000Z

217

Photon enhanced thermionic emission  

DOE Patents [OSTI]

Photon Enhanced Thermionic Emission (PETE) is exploited to provide improved efficiency for radiant energy conversion. A hot (greater than 200.degree. C.) semiconductor cathode is illuminated such that it emits electrons. Because the cathode is hot, significantly more electrons are emitted than would be emitted from a room temperature (or colder) cathode under the same illumination conditions. As a result of this increased electron emission, the energy conversion efficiency can be significantly increased relative to a conventional photovoltaic device. In PETE, the cathode electrons can be (and typically are) thermalized with respect to the cathode. As a result, PETE does not rely on emission of non-thermalized electrons, and is significantly easier to implement than hot-carrier emission approaches.

Schwede, Jared; Melosh, Nicholas; Shen, Zhixun

2014-10-07T23:59:59.000Z

218

Greenhouse Gas Emissions (Minnesota)  

Broader source: Energy.gov [DOE]

This statute sets goals for the reduction of statewide greenhouse gas emissions by at least 15 percent by 2015, 30 percent by 2025, and 80 percent by 2050, calculated relative to 2005 levels. These...

219

Field emission electron source  

DOE Patents [OSTI]

A novel field emitter material, field emission electron source, and commercially feasible fabrication method is described. The inventive field emission electron source produces reliable electron currents of up to 400 mA/cm.sup.2 at 200 volts. The emitter is robust and the current it produces is not sensitive to variability of vacuum or the distance between the emitter tip and the cathode. The novel emitter has a sharp turn-on near 100 volts.

Zettl, Alexander Karlwalter (Kensington, CA); Cohen, Marvin Lou (Berkeley, CA)

2000-01-01T23:59:59.000Z

220

Green Fluorescent Protein Variants as Ratiometric Dual Emission pH Sensors. 2. Excited-State Dynamics  

E-Print Network [OSTI]

of the high-energy absorption band centered at 398 nm and assigned to the neutral form of the chromophore-resolved emission dynamics and isotope effect appear to be very different from those of wild-type GFP [Chattoraj, M energy neutral chromophore to the lower energy intermediate anionic chromophore is achieved by proton

Boxer, Steven G.

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Wildland fire emissions, carbon, and climate: Emission factors Shawn Urbanski  

E-Print Network [OSTI]

Wildland fire emissions, carbon, and climate: Emission factors Shawn Urbanski Missoula Fire burning Greenhouse gases Emission factors a b s t r a c t While the vast majority of carbon emitted wildland fire greenhouse gas and aerosol (organic aerosol (OA) and black carbon (BC)) emission inventories

222

Dielectron Production in Proton-Nucleus Reactions  

E-Print Network [OSTI]

PHYSICAL REVIEW C VOLUME 41, NUMBER 4 Dielectron production in proton-nucleus reactions APRIL 1990 L. Xiong, J. Q. Wu, Z. G. Wu, C. M. Ko, and J. H. Shi Cyclotron Institute, Center for Theoretical Physics and Physics Department, Texas Act...-nucleon inelastic scatterings with their masses be- ing determined according to the following probability dis- tribution R1355 1990 The American Physical Society R1356 L. XIONG, J. Q. WU, Z. G. WU, C. M. KO, AND J. H. SHI with invariant mass M can be evaluated...

Xiong, L.; Wu, J. Q.; Wu, Z. G.; Ko, Che Ming; Shi, J. H.

1990-01-01T23:59:59.000Z

223

Scientists examine proton radiography of brain mockup  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassiveSubmitted forHighlights Nuclear Physics (NP)DataScientistScientists atProton

224

Protons Pair Up With Neutrons | Jefferson Lab  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - SeptemberMicroneedlesAdvanced Photon SourceProtonWeak ChargeEmbargoed: Not for

225

Fast timing detectors for forward protons at the LHC  

SciTech Connect (OSTI)

The author discusses the development of high precision timing detectors for high momentum protons at the LHC, and their application in studying exclusive Higgs boson production.

Albrow, Michael; /Fermilab

2011-04-01T23:59:59.000Z

226

The contribution of strange quarks to the proton magnetic moment  

E-Print Network [OSTI]

This paper deals with how to extract the s-s(bar) contribution to the proton magnetic moment from the experiments

G. Dillon; G. Morpurgo

2006-02-20T23:59:59.000Z

227

The proton gyromagnetic g-factor: an electromagnetic model  

E-Print Network [OSTI]

So far, the Standard Model of Elementary Particles has not succeeded getting a trustworthy account of the proton spin, which remains an enigma. This hindrance is known as the proton spin crisis, owing to the experimental evidence already from 1988 suggesting that little or none of the proton spin would come from the spin of the quarks. This prompted theorists to a flood of guessworks about the proton spin. Since it remains unsolved, in the framework of new physics an exploratory approach based on a novel paradigm is proposed, which brings a renewed access to this challenge, through its reciprocal relationship with the g-factor.

G. Sardin

2009-12-25T23:59:59.000Z

228

Shuttle-mediated proton pumping across the inner mitochondrial membrane  

E-Print Network [OSTI]

Shuttle-assisted charge transfer is pivotal for the efficient energy transduction from the food-stuff electrons to protons in the respiratory chain of animal cells and bacteria. The respiratory chain consists of four metalloprotein Complexes (I-IV) embedded in the inner membrane of a mitochondrion. Three of these complexes pump protons across the membrane, fuelled by the energy of food-stuff electrons. Despite extensive biochemical and biophysical studies, the physical mechanism of this proton pumping is still not well understood. Here we present a nanoelectromechanical model of the electron-driven proton pump related to the second loop of the respiratory chain, where a lipid-soluble ubiquinone molecule shuttles between the Complex I and Complex III, carrying two electrons and two protons. We show that the energy of electrons can be converted to the transmembrane proton potential gradient via the electrostatic interaction between electrons and protons on the shuttle. We find that the system can operate either as a proton pump, or, in the reverse regime, as an electron pump. For membranes with various viscosities, we demonstrate that the uphill proton current peaks near the body temperature $T \\approx 37 ^{\\circ}$C.

Anatoly Yu. Smirnov; Sergey E. Savel'ev; Franco Nori

2008-06-19T23:59:59.000Z

229

affecting proton exchange: Topics by E-print Network  

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

stress applied to the electrode area of a Proton Exchange Membrane (PEM) fuel cell is known to significantly affect power output. In practice, electrode stress arises...

230

annealed proton exchanged: Topics by E-print Network  

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

characterized and integrated in Membrane-Electrodes Assembly to be tested in fuel cell operating conditions, mobile or stationary), Proton Exchange Membrane Fuel Cells...

231

Neutrino oscillation physics with a FNAL proton driver  

E-Print Network [OSTI]

We discuss the need of a proton driver for the Fermilab neutrino oscillation program, as well as its role in the global context.

Walter Winter

2005-10-03T23:59:59.000Z

232

Computational modeling and optimization of proton exchange membrane fuel cells.  

E-Print Network [OSTI]

??Improvements in performance, reliability and durability as well as reductions in production costs, remain critical prerequisites for the commercialization of proton exchange membrane fuel cells. (more)

Secanell Gallart, Marc

2007-01-01T23:59:59.000Z

233

Dynamical effects in proton breakup from exotic nuclei  

SciTech Connect (OSTI)

This contribution discusses dynamical effects in proton breakup from a weakly bound state in an exotic nucleus on a heavy target. The Coulomb interactions between the proton and the core and the proton and the target are treated to all orders, including also the full multipole expansion of the Coulomb potential. The dynamics of proton Coulomb breakup is compared to that of an equivalent neutron of larger binding energy in order to elucidate the differences with the well understood neutron breakup mechanism. A number of experimentally measurable observables such as parallel momentum distributions, proton angular distributions and total breakup cross sections can be calculated. With respect to nuclear breakup it is found that a proton behaves exactly as a neutron of larger binding energy. The extra 'effective energy' is due to the combined core-target Coulomb barrier. In Coulomb breakup we distinguish the effect of the core-target Coulomb potential (called recoil effect), with respect to which the proton behaves again as a more bound neutron, from the direct proton-target Coulomb potential. The latter gives cross sections about an order of magnitude larger than the recoil term. The two effects give rise to complicated interferences in the parallel momentum distributions. They are instead easily separable in the proton angular distributions which are therefore suggested as a very useful observable for future experimental studies.

Bonaccorso, Angela; Kumar, Ravinder [INFN, Sez. di Pisa, Largo B. Pontecorvo 3, 56127 Pisa (Italy); INFN, Sez. di Pisa, Largo B. Pontecorvo 3, 56127 Pisa and Department of Physics, Deenbandhu Chhoturam University of Science and Technology, Murthal, Sonepat, Haryana, 131039 (India)

2012-10-20T23:59:59.000Z

234

Energetics and Dynamics of Fragmentation of Protonated Leucine...  

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

Leucine Enkephalin from Time-and Energy-Resolved Surface-Induced Energetics and Dynamics of Fragmentation of Protonated Leucine Enkephalin from Time-and Energy-Resolved...

235

Proton form factors and two-photon exchange contribution to elastic electron-proton scattering  

E-Print Network [OSTI]

and unpolarized data! R. C. Walker, et al. PRD 49 (1994) 5671. I. A. Qattan, et al. PRL 94 (2005) 142301. M. K. Jones, et al. PRL 84 (2000) 1398. V. Punjabi, et al. PRC 71 (2005) 055202. O. Gayou, et al. PRL 88 (2002) 092301. A. J. R. Puckett, et al. PRL 104 (2010) 242301. Alexander Gramolin (Budker INP) Proton

236

BETA-DELAYED PROTON EMISSION IN NEUTRON-DEFICIENT LRNTHANIDE ISOTOPES  

E-Print Network [OSTI]

and 6 first generated on a Vax mainframe, then capturedspectra were analyzed with a Vax version of SAMFO [Rou69], afloppies were sent to the Vax via the file transfer program

Witmarth, P.A.

2010-01-01T23:59:59.000Z

237

Return current and proton emission from short pulse laser interactions with wire targetsa...  

E-Print Network [OSTI]

of the primary wire target. The observations agree with simulations using the three-dimensional tree code PEPC which result from the very efficient conversion of laser energy into hot electrons. Since the electrons in the electric field of the laser have relativistic quiver motions, the temperature of the hot electron

Strathclyde, University of

238

Ion/proton-conducting apparatus and method  

DOE Patents [OSTI]

A c-axis-oriented HAP thin film synthesized by seeded growth on a palladium hydrogen membrane substrate. An exemplary synthetic process includes electrochemical seeding on the substrate, and secondary and tertiary hydrothermal treatments under conditions that favor growth along c-axes and a-axes in sequence. By adjusting corresponding synthetic conditions, an HAP this film can be grown to a controllable thickness with a dense coverage on the underlying substrate. The thin films have relatively high proton conductivity under hydrogen atmosphere and high temperature conditions. The c-axis oriented films may be integrated into fuel cells for application in the intermediate temperature range of 200-600.degree. C. The electrochemical-hydrothermal deposition technique may be applied to create other oriented crystal materials having optimized properties, useful for separations and catalysis as well as electronic and electrochemical applications, electrochemical membrane reactors, and in chemical sensors. Additional high-density and gas-tight HAP film compositions may be deposited using a two-step deposition method that includes an electrochemical deposition method followed by a hydrothermal deposition method. The two-step method uses a single hydrothermal deposition solution composition. The method may be used to deposit HAP films including but not limited to at least doped HAP films, and more particularly including carbonated HAP films. In addition, the high-density and gas-tight HAP films may be used in proton exchange membrane fuel cells.

Yates, Matthew; Xue, Wei

2014-12-23T23:59:59.000Z

239

Optimal irreversible stimulated emission  

E-Print Network [OSTI]

We studied the dynamics of an initially inverted atom in a semi-infinite waveguide, in the presence of a single propagating photon. We show that atomic relaxation is enhanced by a factor of 2, leading to maximal bunching in the output field. This optimal irreversible stimulated emission is a novel phenomenon that can be observed with state-of-the-art solid-state atoms and waveguides. When the atom interacts with two one-dimensional electromagnetic environments, the preferential emission in the stimulated field can be exploited to efficiently amplify a classical or a quantum state.

D Valente; Y Li; J P Poizat; J M Gerard; L C Kwek; M F Santos; A Auffeves

2012-08-28T23:59:59.000Z

240

Controlled spontaneous emission  

E-Print Network [OSTI]

The problem of spontaneous emission is studied by a direct computer simulation of the dynamics of a combined system: atom + radiation field. The parameters of the discrete finite model, including up to 20k field oscillators, have been optimized by a comparison with the exact solution for the case when the oscillators have equidistant frequencies and equal coupling constants. Simulation of the effect of multi-pulse sequence of phase kicks and emission by a pair of atoms shows that both the frequency and the linewidth of the emitted spectrum could be controlled.

Jae-Seung Lee; Mary A. Rohrdanz; A. K. Khitrin

2007-07-03T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Computational Modeling and Optimization of Proton Exchange Membrane Fuel Cells  

E-Print Network [OSTI]

Computational Modeling and Optimization of Proton Exchange Membrane Fuel Cells by Marc Secanell and Optimization of Proton Exchange Membrane Fuel Cells by Marc Secanell Gallart Bachelor in Engineering cells. In this thesis, a computational framework for fuel cell analysis and optimization is presented

Victoria, University of

242

Low energy proton storage ring with longitudinal magnetic  

E-Print Network [OSTI]

Low energy proton storage ring with longitudinal magnetic field and electron cooling M.I. Bryzgunov energy protons. In this particular case it is reaction for production of resonant gamma-quant (9.17 Me Electron cooling: compensates heating effects on internal target compensates energy losses on target

243

Method and apparatus for laser-controlled proton beam radiology  

DOE Patents [OSTI]

A proton beam radiology system provides cancer treatment and proton radiography. The system includes an accelerator for producing an H.sup.- beam and a laser source for generating a laser beam. A photodetachment module is located proximate the periphery of the accelerator. The photodetachment module combines the H.sup.- beam and laser beam to produce a neutral beam therefrom within a subsection of the H.sup.- beam. The photodetachment module emits the neutral beam along a trajectory defined by the laser beam. The photodetachment module includes a stripping foil which forms a proton beam from the neutral beam. The proton beam is delivered to a conveyance segment which transports the proton beam to a patient treatment station. The photodetachment module further includes a laser scanner which moves the laser beam along a path transverse to the cross-section of the H.sup.- beam in order to form the neutral beam in subsections of the H.sup.- beam. As the scanning laser moves across the H.sup.- beam, it similarly varies the trajectory of the proton beam emitted from the photodetachment module and in turn varies the target location of the proton beam upon the patient. Intensity modulation of the proton beam can also be achieved by controlling the output of the laser.

Johnstone, Carol J. (Warrenville, IL)

1998-01-01T23:59:59.000Z

244

Epoxy-crosslinked sulfonated poly (phenylene) copolymer proton exchange membranes  

DOE Patents [OSTI]

An epoxy-crosslinked sulfonated poly(phenylene) copolymer composition used as proton exchange membranes, methods of making the same, and their use as proton exchange membranes (PEM) in hydrogen fuel cells, direct methanol fuel cell, in electrode casting solutions and electrodes, and in sulfur dioxide electrolyzers. These improved membranes are tougher, have higher temperature capability, and lower SO.sub.2 crossover rates.

Hibbs, Michael (Albuquerque, NM); Fujimoto, Cy H. (Albuquerque, NM); Norman, Kirsten (Albuquerque, NM); Hickner, Michael A. (State College, PA)

2010-10-19T23:59:59.000Z

245

DPA and Gas Production from Protons on W and Be  

E-Print Network [OSTI]

Production in Tungsten Ran the Mu2e target in MARS15 using the following parameters: 8 GeV protonsDPA and Gas Production from Protons on W and Be Brian Hartsell FNAL March 20, 2013 #12;DPA and Gas on Tungsten target Gaussian distribution with 1mm X and Y sigma 6mm diameter, 160mm length target 3 bins

McDonald, Kirk

246

Method and apparatus for laser-controlled proton beam radiology  

DOE Patents [OSTI]

A proton beam radiology system provides cancer treatment and proton radiography. The system includes an accelerator for producing an H{sup {minus}} beam and a laser source for generating a laser beam. A photodetachment module is located proximate the periphery of the accelerator. The photodetachment module combines the H{sup {minus}} beam and laser beam to produce a neutral beam therefrom within a subsection of the H{sup {minus}} beam. The photodetachment module emits the neutral beam along a trajectory defined by the laser beam. The photodetachment module includes a stripping foil which forms a proton beam from the neutral beam. The proton beam is delivered to a conveyance segment which transports the proton beam to a patient treatment station. The photodetachment module further includes a laser scanner which moves the laser beam along a path transverse to the cross-section of the H{sup {minus}} beam in order to form the neutral beam in subsections of the H{sup {minus}} beam. As the scanning laser moves across the H{sup {minus}} beam, it similarly varies the trajectory of the proton beam emitted from the photodetachment module and in turn varies the target location of the proton beam upon the patient. Intensity modulation of the proton beam can also be achieved by controlling the output of the laser. 9 figs.

Johnstone, C.J.

1998-06-02T23:59:59.000Z

247

Measurements of neutron dose equivalent for a proton therapy center using uniform scanning proton beams  

SciTech Connect (OSTI)

Purpose: Neutron exposure is of concern in proton therapy, and varies with beam delivery technique, nozzle design, and treatment conditions. Uniform scanning is an emerging treatment technique in proton therapy, but neutron exposure for this technique has not been fully studied. The purpose of this study is to investigate the neutron dose equivalent per therapeutic dose, H/D, under various treatment conditions for uniform scanning beams employed at our proton therapy center. Methods: Using a wide energy neutron dose equivalent detector (SWENDI-II, ThermoScientific, MA), the authors measured H/D at 50 cm lateral to the isocenter as a function of proton range, modulation width, beam scanning area, collimated field size, and snout position. They also studied the influence of other factors on neutron dose equivalent, such as aperture material, the presence of a compensator, and measurement locations. They measured H/D for various treatment sites using patient-specific treatment parameters. Finally, they compared H/D values for various beam delivery techniques at various facilities under similar conditions. Results: H/D increased rapidly with proton range and modulation width, varying from about 0.2 mSv/Gy for a 5 cm range and 2 cm modulation width beam to 2.7 mSv/Gy for a 30 cm range and 30 cm modulation width beam when 18 Multiplication-Sign 18 cm{sup 2} uniform scanning beams were used. H/D increased linearly with the beam scanning area, and decreased slowly with aperture size and snout retraction. The presence of a compensator reduced the H/D slightly compared with that without a compensator present. Aperture material and compensator material also have an influence on neutron dose equivalent, but the influence is relatively small. H/D varied from about 0.5 mSv/Gy for a brain tumor treatment to about 3.5 mSv/Gy for a pelvic case. Conclusions: This study presents H/D as a function of various treatment parameters for uniform scanning proton beams. For similar treatment conditions, the H/D value per uncollimated beam size for uniform scanning beams was slightly lower than that from a passive scattering beam and higher than that from a pencil beam scanning beam, within a factor of 2. Minimizing beam scanning area could effectively reduce neutron dose equivalent for uniform scanning beams, down to the level close to pencil beam scanning.

Zheng Yuanshui; Liu Yaxi; Zeidan, Omar; Schreuder, Andries Niek; Keole, Sameer [ProCure Proton Therapy Center, 5901 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States); INTEGRIS Cancer Insititute, 5911 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States); ProCure Proton Therapy Center, 5901 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States); ProCure Treatment Centers, 420 North Walnut Street, Bloomington, Indiana 47404 (United States); ProCure Proton Therapy Center, 5901 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States)

2012-06-15T23:59:59.000Z

248

Proton Therapy Coverage for Prostate Cancer Treatment  

SciTech Connect (OSTI)

Purpose: To determine the impact of prostate motion on dose coverage in proton therapy. Methods and Materials: A total of 120 prostate positions were analyzed on 10 treatment plans for 10 prostate patients treated using our low-risk proton therapy prostate protocol (University of Florida Proton Therapy Institute 001). Computed tomography and magnetic resonance imaging T{sub 2}-weighted turbo spin-echo scans were registered for all cases. The planning target volume included the prostate with a 5-mm axial and 8-mm superoinferior expansion. The prostate was repositioned using 5- and 10-mm one-dimensional vectors and 10-mm multidimensional vectors (Points A-D). The beam was realigned for the 5- and 10-mm displacements. The prescription dose was 78 Gy equivalent (GE). Results: The mean percentage of rectum receiving 70 Gy (V{sub 70}) was 7.9%, the bladder V{sub 70} was 14.0%, and the femoral head/neck V{sub 50} was 0.1%, and the mean pelvic dose was 4.6 GE. The percentage of prostate receiving 78 Gy (V{sub 78}) with the 5-mm movements changed by -0.2% (range, 0.006-0.5%, p > 0.7). However, the prostate V{sub 78} after a 10-mm displacement changed significantly (p < 0.003) with different movements: 3.4% (superior), -5.6% (inferior), and -10.2% (posterior). The corresponding minimal doses were also reduced: 4.5 GE, -4.7 GE, and -11.7 GE (p {<=} 0.003). For displacement points A-D, the clinical target volume V{sub 78} coverage had a large and significant reduction of 17.4% (range, 13.5-17.4%, p < 0.001) in V{sub 78} coverage of the clinical target volume. The minimal prostate dose was reduced 33% (25.8 GE), on average, for Points A-D. The prostate minimal dose improved from 69.3 GE to 78.2 GE (p < 0.001) with realignment for 10-mm movements. Conclusion: The good dose coverage and low normal doses achieved for the initial plan was maintained with movements of {<=}5 mm. Beam realignment improved coverage for 10-mm displacements.

Vargas, Carlos [University of Florida Proton Therapy Institute, Jacksonville, FL (United States); Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, FL (United States)], E-mail: c2002@ufl.edu; Wagner, Marcus; Mahajan, Chaitali [University of Florida Proton Therapy Institute, Jacksonville, FL (United States); Indelicato, Daniel [Department of Radiation Oncology, University of Florida College of Medicine, Gainesville, FL (United States); Fryer, Amber; Falchook, Aaron; Horne, David C.; Chellini, Angela; McKenzie, Craig C.; Lawlor, Paula C.; Li Zuofeng; Lin Liyong; Keole, Sameer [University of Florida Proton Therapy Institute, Jacksonville, FL (United States)

2008-04-01T23:59:59.000Z

249

Designer proton-channel transgenic algae for photobiological hydrogen production  

DOE Patents [OSTI]

A designer proton-channel transgenic alga for photobiological hydrogen production that is specifically designed for production of molecular hydrogen (H.sub.2) through photosynthetic water splitting. The designer transgenic alga includes proton-conductive channels that are expressed to produce such uncoupler proteins in an amount sufficient to increase the algal H.sub.2 productivity. In one embodiment the designer proton-channel transgene is a nucleic acid construct (300) including a PCR forward primer (302), an externally inducible promoter (304), a transit targeting sequence (306), a designer proton-channel encoding sequence (308), a transcription and translation terminator (310), and a PCR reverse primer (312). In various embodiments, the designer proton-channel transgenic algae are used with a gas-separation system (500) and a gas-products-separation and utilization system (600) for photobiological H.sub.2 production.

Lee, James Weifu (Knoxville, TN)

2011-04-26T23:59:59.000Z

250

Emissions Trading and Air Toxics Emissions: RECLAIM and Toxics Regulation in the South Coast Air Basin  

E-Print Network [OSTI]

fugitive emissions in an emissions trading program, as theexists between an emissions trading program that allows aircreation of other ROC emissions trading programs. JOURNAL OF

Cohen, Nancy J.

1993-01-01T23:59:59.000Z

251

Nanostructured polymer membranes for proton conduction  

DOE Patents [OSTI]

Polymers having an improved ability to entrain water are characterized, in some embodiments, by unusual humidity-induced phase transitions. The described polymers (e.g., hydrophilically functionalized block copolymers) have a disordered state and one or more ordered states (e.g., a lamellar state, a gyroid state, etc.). In one aspect, the polymers are capable of undergoing a disorder-to-order transition while the polymer is exposed to an increasing temperature at a constant relative humidity. In some aspects the polymer includes a plurality of portions, wherein a first portion forms proton-conductive channels within the membrane and wherein the channels have a width of less than about 6 nm. The described polymers are capable of entraining and preserving water at high temperature and low humidity. Surprisingly, in some embodiments, the polymers are capable of entraining greater amounts of water with the increase of temperature. The polymers can be used in Polymer Electrolyte Membranes in fuel cells.

Balsara, Nitash Pervez; Park, Moon Jeong

2013-06-18T23:59:59.000Z

252

Strange Electric Form Factor of the Proton  

E-Print Network [OSTI]

By combining the constraints of charge symmetry with new chiral extrapolation techniques and recent low-mass quenched lattice QCD simulations of the individual quark contributions to the electric charge radii of the baryon octet, we obtain an accurate determination of the strange electric charge radius of the proton. While this analysis provides a value for G_E^s(Q^2=0.1 GeV^2) in agreement with the best current data, the theoretical error is comparable with that expected from future HAPPEx results from JLab. Together with the earlier determination of G_M^s, this result considerably constrains the role of hidden flavor in the structure of the nucleon.

D. B. Leinweber; S. Boinepalli; A. W. Thomas; P. Wang; A. G. Williams; R. D. Young; J. M. Zanotti; J. B. Zhang

2006-07-18T23:59:59.000Z

253

Causality bounds for neutron-proton scattering  

E-Print Network [OSTI]

We consider the constraints of causality and unitarity for the low-energy interactions of protons and neutrons. We derive a general theorem that non-vanishing partial-wave mixing cannot be reproduced with zero-range interactions without violating causality or unitarity. We define and calculate interaction length scales which we call the causal range and the Cauchy-Schwarz range for all spin channels up to J = 3. For some channels we find that these length scales are as large as 5 fm. We investigate the origin of these large lengths and discuss their significance for the choice of momentum cutoff scales in effective field theory and universality in many-body Fermi systems.

Serdar Elhatisari; Dean Lee

2012-07-25T23:59:59.000Z

254

Ion-/proton-conducting apparatus and method  

DOE Patents [OSTI]

A c-axis-oriented HAP thin film synthesized by seeded growth on a palladium hydrogen membrane substrate. An exemplary synthetic process includes electrochemical seeding on the substrate, and secondary and tertiary hydrothermal treatments under conditions that favor growth along c-axes and a-axes in sequence. By adjusting corresponding synthetic conditions, an HAP this film can be grown to a controllable thickness with a dense coverage on the underlying substrate. The thin films have relatively high proton conductivity under hydrogen atmosphere and high temperature conditions. The c-axis oriented films may be integrated into fuel cells for application in the intermediate temperature range of 200-600.degree. C. The electrochemical-hydrothermal deposition technique may be applied to create other oriented crystal materials having optimized properties, useful for separations and catalysis as well as electronic and electrochemical applications, electrochemical membrane reactors, and in chemical sensors.

Yates, Matthew (Penfield, NY); Liu, Dongxia (Rochester, NY)

2011-05-17T23:59:59.000Z

255

Secondary emission gas chamber  

E-Print Network [OSTI]

For a hadron calorimeter active element there is considered a gaseous secondary emis-sion detector (150 micron gap, 50 kV/cm). Such one-stage parallel plate chamber must be a radiation hard, fast and simple. A model of such detector has been produced, tested and some characteristics are presented.

V. In'shakov; V. Kryshkin; V. Skvortsov

2014-12-10T23:59:59.000Z

256

CARBON DIOXIDE EMISSION REDUCTION  

E-Print Network [OSTI]

.5 Primary Energy Use and Carbon Dioxide Emissions for Selected US Chemical Subsectors in 1994 ...............................................................................................................16 Table 2.7 1999 Energy Consumption and Specific Energy Consumption (SEC) in the U.S. Cement Efficiency Technologies and Measures in Cement Industry.................22 Table 2.9 Energy Consumption

Delaware, University of

257

Graphene Coating Coupled Emission  

E-Print Network [OSTI]

Graphene Coating Coupled Emission A COMSET, A single sheet of sp2-hybridized carbon atoms, called of graphene and its unique properties, I will present amplification of surface graphene-Ag hybrid films which when graphene is used as the spacer layer in a conventional Ag- harnessed the nonlinear properties

Shyamasundar, R.K.

258

A CR-hydro-NEI Model of the Structure and Broadband Emission from Tycho's SNR  

E-Print Network [OSTI]

Tycho's supernova remnant (SNR) is well-established as a source of particle acceleration to very high energies. Constraints from numerous studies indicate that the observed gamma-ray emission results primarily from hadronic processes, providing direct evidence of highly relativistic ions that have been accelerated by the SNR. Here we present an investigation of the dynamical and spectral evolution of Tycho's SNR by carrying out hydrodynamical simulations that include diffusive shock acceleration of particles in the amplified magnetic field at the forward shock of the SNR. Our simulations provide a consistent view of the shock positions, the nonthermal emission, the thermal X-ray emission from the forward shock, and the brightness profiles of the radio and X-ray emission. We compare these with the observed properties of Tycho to determine the density of the ambient material, the particle acceleration efficiency and maximum energy, the accelerated electron to-proton ratio, and the properties of the shocked gas ...

Slane, P; Ellison, D C; Patnaude, D J; Hughes, J P; Eriksen, K A; Castro, D; Nagataki, S

2014-01-01T23:59:59.000Z

259

E-Print Network 3.0 - amide proton transfer Sample Search Results  

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

their amide proton exchange rates in water and sodium dodecyl sulfate (SDS) micelles... . Hydrogen exchange was measured using steady-state saturation-transfer proton nuclear...

260

E-Print Network 3.0 - annular-radiator proton-recoil spectrometer...  

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

Cris W. Barnes, S. S... -sensitivity proton recoil telescope consisting of a polyethylene radiator and a low-energy-proton Teflon filter... as a triton burnup monitor. The...

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


261

E-Print Network 3.0 - accelerating monoenergetic protons Sample...  

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

26 proposed an acceleration scheme for the generation of monoenergetic proton beams, where all... in the charge density, which accelerates those protons close to the...

262

E-Print Network 3.0 - adding proton therapy Sample Search Results  

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

results for: adding proton therapy Page: << < 1 2 3 4 5 > >> 1 Proton and Particle Beams in Cancer Management Sponsored by the Program in Radiation Biology Summary: on...

263

Generalized z-scaling in proton-proton collisions at high energies  

E-Print Network [OSTI]

New generalization of z-scaling in inclusive particle production is proposed. The scaling variable z is fractal measure which depends on kinematical characteristics of the underlying sub-process expressed in terms of the momentum fractions x1 and x2 of the incoming protons. In the generalized approach, the x1 and x2 are functions of the momentum fractions ya and yb of the scattered and recoil constituents carried out by the inclusive particle and recoil object, respectively. The scaling function psi(z) for charged and identified hadrons produced in proton-proton collisions is constructed. The fractal dimensions and heat capacity of the produced medium entering definition of the z are established to obtain energy, angular and multiplicity independence of the psi(z). The scheme allows unique description of data on inclusive cross sections of charged particles, pions, kaons, antiprotons and lambdas at high energies. The obtained results are of interest to use z-scaling as a tool for searching for new physics phe...

Zborovsk, I

2006-01-01T23:59:59.000Z

264

Low-Energy Nuclear Reactions of Protons in Host Metals at Picometre Distance  

SciTech Connect (OSTI)

A review is given for the explanation of the measurements of Miley et al. of a fully reproducible generation of nuclei of the whole periodic table by protons in host metals during a several-weeks reaction. Similar low-energy nuclear reactions (LENR) were observed by other groups. The fact that the heavy nuclides are not due to pollution can be seen from the fact that such very rare elements as thulium and terbium were detected by unique K-shell X-ray spectra. The nuclear reaction energy goes into the heavy nuclei as measured from much bigger traces in CR39 than from alphas. The fact that any reaction of the protons results in stable daughter nuclei is confirmed by the fact that the highest energy gain is resulting with stable reaction products. This has been explained in Ref. 2, and the energy gain for the heavy element generation by a compound reaction was discussed. The explanation is based on the model of the authors from 1989 to assume free motion of the protons contrary to localized crystalline states. A relation of the reaction time U on distance d of the reacting nuclei by a power law with an exponent 34.8 was derived. Based on few reproducible D-D reactions, a reaction time near the range of megaseconds and a reaction distance of nanometers was concluded. A splendid confirmation of the picometre-megasecond reactions was achieved by Li et al. from his direct quantum mechanical calculations of the hot fusion D-T reactions based on a one-step selective resonance tunneling model. Li et al. were able for the first time to derive the cross sections of the hot fusion. Li's application to picometre distance showed megasecond reaction times with no neutron or gamma emission. Because of the imaginary part in the Schroedinger potential, the problem of the level width is reduced by damping.

Heinrich Hora; George H. Miley; Jak C. Kelly

2000-11-12T23:59:59.000Z

265

Allocation of emission rights Economic incentives for emission  

E-Print Network [OSTI]

for all countries High cost effectiviness:High cost effectiviness: International Emission trading Fairness NAM Department of Physical Resource Theory #12;Financial flows from emissions trading 450 ppmGDP SAS CPA WEU NAM Department of Physical Resource Theory #12;Financial flows from emissions trading 450

266

Proton exchange membrane fuel cells for electrical power generation on-board commercial airplanes.  

SciTech Connect (OSTI)

Deployed on a commercial airplane, proton exchange membrane fuel cells may offer emissions reductions, thermal efficiency gains, and enable locating the power near the point of use. This work seeks to understand whether on-board fuel cell systems are technically feasible, and, if so, if they offer a performance advantage for the airplane as a whole. Through hardware analysis and thermodynamic and electrical simulation, we found that while adding a fuel cell system using today's technology for the PEM fuel cell and hydrogen storage is technically feasible, it will not likely give the airplane a performance benefit. However, when we re-did the analysis using DOE-target technology for the PEM fuel cell and hydrogen storage, we found that the fuel cell system would provide a performance benefit to the airplane (i.e., it can save the airplane some fuel), depending on the way it is configured.

Curgus, Dita Brigitte; Munoz-Ramos, Karina (Sandia National Laboratories, Albuquerque, NM); Pratt, Joseph William; Akhil, Abbas Ali (Sandia National Laboratories, Albuquerque, NM); Klebanoff, Leonard E.; Schenkman, Benjamin L. (Sandia National Laboratories, Albuquerque, NM)

2011-05-01T23:59:59.000Z

267

Field emission from organic materials  

E-Print Network [OSTI]

Field emission displays (FEDs) show great promise as high performance flat panel displays. The light emission process is efficient, long lifetimes are possible with high brightness, and bright passive matrix displays can ...

Kymissis, Ioannis, 1977-

2003-01-01T23:59:59.000Z

268

Commissioning of output factors for uniform scanning proton beams  

SciTech Connect (OSTI)

Purpose: Current commercial treatment planning systems are not able to accurately predict output factors and calculate monitor units for proton fields. Patient-specific field output factors are thus determined by either measurements or empirical modeling based on commissioning data. The objective of this study is to commission output factors for uniform scanning beams utilized at the ProCure proton therapy centers. Methods: Using water phantoms and a plane parallel ionization chamber, the authors first measured output factors with a fixed 10 cm diameter aperture as a function of proton range and modulation width for clinically available proton beams with ranges between 4 and 31.5 cm and modulation widths between 2 and 15 cm. The authors then measured the output factor as a function of collimated field size at various calibration depths for proton beams of various ranges and modulation widths. The authors further examined the dependence of the output factor on the scanning area (i.e., uncollimated proton field), snout position, and phantom material. An empirical model was developed to calculate the output factor for patient-specific fields and the model-predicted output factors were compared to measurements. Results: The output factor increased with proton range and field size, and decreased with modulation width. The scanning area and snout position have a small but non-negligible effect on the output factors. The predicted output factors based on the empirical modeling agreed within 2% of measurements for all prostate treatment fields and within 3% for 98.5% of all treatment fields. Conclusions: Comprehensive measurements at a large subset of available beam conditions are needed to commission output factors for proton therapy beams. The empirical modeling agrees well with the measured output factor data. This investigation indicates that it is possible to accurately predict output factors and thus eliminate or reduce time-consuming patient-specific output measurements for proton treatments.

Zheng Yuanshui; Ramirez, Eric; Mascia, Anthony; Ding Xiaoning; Okoth, Benny; Zeidan, Omar; Hsi Wen; Harris, Ben; Schreuder, Andries N.; Keole, Sameer [ProCure Proton Therapy Center, 5901 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States); ProCure Treatment Centers, 420 North Walnut Street, Bloomington, Indiana 47404 (United States); ProCure Proton Therapy Center, 5901 West Memorial Road, Oklahoma City, Oklahoma 73142 (United States)

2011-04-15T23:59:59.000Z

269

Emission altitude in radio pulsars  

E-Print Network [OSTI]

This paper presents a method of estimation of emission altitudes using observational data - precise measurements of pulse profile widths at low intensity level. The analysis of emission altitudes obtained using this method for a large number of pulsars gives constraints that should be useful for theory of coherent pulsar emission. It seems that radio emission originates at altitudes of about few percent of the light cylinder and that they depend on frequency, pulsar period and period derivative.

J. Kijak

2002-08-30T23:59:59.000Z

270

6, 57735796, 2006 Vehicular emissions  

E-Print Network [OSTI]

be partly responsible for lower CO2 and higher CO and NO emission factors. Also, a fast reduction the emission (in g/km) of key and non-regulated pollutants, such as CO2, CO, NO, SO2, NH3, HCHO, NMHC, dur-10 of pollutants, even from a super ultra-low emission vehicle (SULEV). The emissions of HC's, NOx, CO20 and CO2

Paris-Sud XI, Université de

271

Emission Controls for Heavy-Duty Trucks  

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

DEER Conference Emission Controls for Heavy-Duty Trucks Overview Emission Standards - US and Worldwide Technology Options for Meeting Emissions System Integration ...

272

Radionuclide Air Emission Report for 2011  

E-Print Network [OSTI]

470E-201 Radionuclide Air Emission Report for Prepared by:Environmental Protection Agency, National Emission Standardsfor Emissions of Radionuclides Other Than Radon From

Wahl, Linnea

2012-01-01T23:59:59.000Z

273

Greenhouse gas emissions in biogas production systems  

E-Print Network [OSTI]

Cameron KC. Nitrous oxide emissions from two dairy pastureand land use on N 2 O emissions from an imperfectly drainedoptions for N 2 O emissions from differently managed

Dittert, Klaus; Senbayram, Mehmet; Wienforth, Babette; Kage, Henning; Muehling, Karl H

2009-01-01T23:59:59.000Z

274

Distributed Energy Resources for Carbon Emissions Mitigation  

E-Print Network [OSTI]

Energy Resources for Carbon Emissions Mitigation RyanEnergy Resources for Carbon Emissions Mitigation Ryanand/or site-attributable carbon emissions at commercial and

Firestone, Ryan; Marnay, Chris

2008-01-01T23:59:59.000Z

275

Self-Excitation and Feedback Cooling of an Isolated Proton  

SciTech Connect (OSTI)

The first one-proton self-excited oscillator (SEO) and one-proton feedback cooling are demonstrated. In a Penning trap with a large magnetic gradient, the SEO frequency is resolved to the high precision needed to detect a one-proton spin flip. This is after undamped magnetron motion is sideband cooled to a 14 mK theoretical limit, and despite random frequency shifts (typically larger than those from a spin flip) that take place every time sideband cooling is applied. The observations open a possible path towards a million-fold improved comparison of the p and p magnetic moments.

Guise, N.; DiSciacca, J.; Gabrielse, G. [Department of Physics, Harvard University, Cambridge, Massachusetts 02138 (United States)

2010-04-09T23:59:59.000Z

276

Direct mass measurements beyond the proton drip-line  

E-Print Network [OSTI]

First on-line mass measurements were performed at the SHIPTRAP Penning trap mass spectrometer. The masses of 18 neutron-deficient isotopes in the terbium-to-thulium region produced in fusion-evaporation reactions were determined with relative uncertainties of about $7\\cdot 10^{-8}$, nine of them for the first time. Four nuclides ($^{144, 145}$Ho and $^{147, 148}$Tm) were found to be proton-unbound. The implication of the results on the location of the proton drip-line is discussed by analyzing the one-proton separation energies.

C. Rauth; D. Ackermann; K. Blaum; M. Block; A. Chaudhuri; S. Eliseev; R. Ferrer; D. Habs; F. Herfurth; F. P. Hessberger; S. Hofmann; H. -J. Kluge; G. Maero; A. Martin; G. Marx; M. Mukherjee; J. B. Neumayr; W. R. Plass; W. Quint; S. Rahaman; D. Rodriguez; C. Scheidenberger; L. Schweikhard; P. G. Thirolf; G. Vorobjev; C. Weber; Z. Di

2007-01-22T23:59:59.000Z

277

Improved proton computed tomography by dual modality image reconstruction  

SciTech Connect (OSTI)

Purpose: Proton computed tomography (CT) is a promising image modality for improving the stopping power estimates and dose calculations for particle therapy. However, the finite range of about 33 cm of water of most commercial proton therapy systems limits the sites that can be scanned from a full 360 rotation. In this paper the authors propose a method to overcome the problem using a dual modality reconstruction (DMR) combining the proton data with a cone-beam x-ray prior. Methods: A Catphan 600 phantom was scanned using a cone beam x-ray CT scanner. A digital replica of the phantom was created in the Monte Carlo code Geant4 and a 360 proton CT scan was simulated, storing the entrance and exit position and momentum vector of every proton. Proton CT images were reconstructed using a varying number of angles from the scan. The proton CT images were reconstructed using a constrained nonlinear conjugate gradient algorithm, minimizing total variation and the x-ray CT prior while remaining consistent with the proton projection data. The proton histories were reconstructed along curved cubic-spline paths. Results: The spatial resolution of the cone beam CT prior was retained for the fully sampled case and the 90 interval case, with the MTF = 0.5 (modulation transfer function) ranging from 5.22 to 5.65?linepairs/cm. In the 45 interval case, the MTF = 0.5 dropped to 3.91?linepairs/cm For the fully sampled DMR, the maximal root mean square (RMS) error was 0.006 in units of relative stopping power. For the limited angle cases the maximal RMS error was 0.18, an almost five-fold improvement over the cone beam CT estimate. Conclusions: Dual modality reconstruction yields the high spatial resolution of cone beam x-ray CT while maintaining the improved stopping power estimation of proton CT. In the case of limited angles, the use of prior image proton CT greatly improves the resolution and stopping power estimate, but does not fully achieve the quality of a 360 proton CT scan.

Hansen, David C., E-mail: dch@ki.au.dk; Bassler, Niels [Experimental Clinical Oncology, Aarhus University, 8000 Aarhus C (Denmark)] [Experimental Clinical Oncology, Aarhus University, 8000 Aarhus C (Denmark); Petersen, Jrgen Breede Baltzer [Medical Physics, Aarhus University Hospital, 8000 Aarhus C (Denmark)] [Medical Physics, Aarhus University Hospital, 8000 Aarhus C (Denmark); Srensen, Thomas Sangild [Computer Science, Aarhus University, 8000 Aarhus C, Denmark and Clinical Medicine, Aarhus University, 8200 Aarhus N (Denmark)] [Computer Science, Aarhus University, 8000 Aarhus C, Denmark and Clinical Medicine, Aarhus University, 8200 Aarhus N (Denmark)

2014-03-15T23:59:59.000Z

278

Gluonic Spin Contribution to Proton Spin at NLO  

SciTech Connect (OSTI)

In 1988, when the EMC results showed that the quarks had a much smaller contribution to the spin of the proton than previously thought, the 'Proton Spin Crisis' began. Since then, considerable effort has been directed into discovering the main contributors to proton spin and how much each contributes. One such contributor is the gluonic spin component. QCD NLO evolution equations are combined with boundary conditions obtained from heavy quark decoupling expressions to evolve the equations from infinity to the mass of the charm quark in order to determine the gluonic spin contribution.

Casey, Andrew [CSSM, School of Chemistry and Physics, University of Adelaide, Adelaide SA 5005 (Australia)

2011-05-24T23:59:59.000Z

279

Measurement of the Proton's Neutral Weak Magnetic Form Factor  

E-Print Network [OSTI]

We report the first measurement of the parity-violating asymmetry in elastic electron scattering from the proton. The asymmetry depends on the neutral weak magnetic form factor of the proton which contains new information on the contribution of strange quark-antiquark pairs to the magnetic moment of the proton. We obtain the value $G_M^Z= 0.34 \\pm 0.09 \\pm 0.04 \\pm 0.05$ n.m. at $Q^2=0.1$ (GeV/c)${}^2$.

B. Mueller; D. H. Beck; E. J. Beise; E. Candell; L. Cardman; R. Carr; R. C. DiBari; G. Dodson; K. Dow; F. Duncan; M. Farkhondeh; B. W. Filippone; T. Forest; H. Gao; W. Korsch; S. Kowalski; A. Lung; R. D. McKeown; R. Mohring; J. Napolitano; D. Nilsson; M. Pitt; N. Simicevic; B. Terburg; S. P. Wells

1997-02-26T23:59:59.000Z

280

Low emissions diesel fuel  

DOE Patents [OSTI]

A method and matter of composition for controlling NO.sub.x emissions from existing diesel engines. The method is achieved by adding a small amount of material to the diesel fuel to decrease the amount of NO.sub.x produced during combustion. Specifically, small amounts, less than about 1%, of urea or a triazine compound (methylol melamines) are added to diesel fuel. Because urea and triazine compounds are generally insoluble in diesel fuel, microemulsion technology is used to suspend or dissolve the urea or triazine compound in the diesel fuel. A typical fuel formulation includes 5% t-butyl alcohol, 4.5% water, 0.5% urea or triazine compound, 9% oleic acid, and 1% ethanolamine. The subject invention provides improved emissions in heavy diesel engines without the need for major modifications.

Compere, Alicia L. (Knoxville, TN); Griffith, William L. (Oak Ridge, TN); Dorsey, George F. (Farragut, TN); West, Brian H. (Kingston, TN)

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Low emissions diesel fuel  

DOE Patents [OSTI]

A method and matter of composition for controlling NO{sub x} emissions from existing diesel engines. The method is achieved by adding a small amount of material to the diesel fuel to decrease the amount of NO{sub x} produced during combustion. Specifically, small amounts, less than about 1%, of urea or a triazine compound (methylol melamines) are added to diesel fuel. Because urea and triazine compounds are generally insoluble in diesel fuel, microemulsion technology is used to suspend or dissolve the urea or triazine compound in the diesel fuel. A typical fuel formulation includes 5% t-butyl alcohol, 4.5% water, 0.5% urea or triazine compound, 9% oleic acid, and 1% ethanolamine. The subject invention provides improved emissions in heavy diesel engines without the need for major modifications.

Compere, A.L.; Griffith, W.L.; Dorsey, G.F.; West, B.H.

1998-05-05T23:59:59.000Z

282

4, 507532, 2004 Emission uncertainty  

E-Print Network [OSTI]

and Physics Discussions Impact of different emission inventories on simulated tropospheric ozone over China The importance of emission inventory uncertainty on the simulation of summertime tro- pospheric Ozone over China has been analyzed using a regional chemical transport model. Three independent emissions inventories

Boyer, Edmond

283

5, 94059445, 2005 Methane emissions  

E-Print Network [OSTI]

ACPD 5, 9405­9445, 2005 Methane emissions from SCIAMACHY observations J. F. Meirink et al. Title and Physics Discussions Sensitivity analysis of methane emissions derived from SCIAMACHY observations through, 9405­9445, 2005 Methane emissions from SCIAMACHY observations J. F. Meirink et al. Title Page Abstract

Paris-Sud XI, Université de

284

5, 243270, 2008 Methane emissions  

E-Print Network [OSTI]

BGD 5, 243­270, 2008 Methane emissions from plant biomass I. Vigano et al. Title Page Abstract and temperature on the emission of methane from plant biomass and structural components I. Vigano 1 , H. van.roeckmann@phys.uu.nl) 243 #12;BGD 5, 243­270, 2008 Methane emissions from plant biomass I. Vigano et al. Title Page Abstract

Paris-Sud XI, Université de

285

6, 68416852, 2006 Methane emission  

E-Print Network [OSTI]

ACPD 6, 6841­6852, 2006 Methane emission from savanna grasses E. Sanhueza and L. Donoso Title Page Chemistry and Physics Discussions Methane emission from tropical savanna Trachypogon sp. grasses E. Sanhueza;ACPD 6, 6841­6852, 2006 Methane emission from savanna grasses E. Sanhueza and L. Donoso Title Page

Boyer, Edmond

286

Coronal emission lines as thermometers  

E-Print Network [OSTI]

Coronal emission line intensities are commonly used to measure electron temperatures using emission measure and/or line ratio methods. In the presence of systematic errors in atomic excitation calculations and data noise, the information on underlying temperature distributions is fundamentally limited. Increasing the number of emission lines used does not necessarily improve the ability to discriminate between different kinds of temperature distributions.

Judge, Philip G

2009-01-01T23:59:59.000Z

287

Gas Turbine Emissions  

E-Print Network [OSTI]

technology developers and electric utilities will share emissions reductions in the coming era of pollution allowance trading is becoming prominent on the agendas of strategic planners at technology vendors and the electric power industry ??? ? (1...., "Authority to Construct for Badger Creek Limited," Kern County Air Pollution Control District, Bakersfield.. Ca., June 20, 1989. 3) Wark, K. and Warner, C. F., Air Pollution - Its Origin and Control, Harper and Row, New York, New York, 1976, pp. 453...

Frederick, J. D.

288

Analysis of Emission Shapes  

E-Print Network [OSTI]

Shapes of relative emission sources can be accessed by expanding shapes of correlations at low relative velocities in pair center of mass in Cartesian harmonics. Coefficients of expansion for correlations are related to the respective coefficients of expansion for the sources through one dimensional integral transforms involving properties of pair relative wavefunctions. The methodology is illustrated with analyses of NA49 and PHENIX correlation data.

P. Danielewicz

2007-07-03T23:59:59.000Z

289

Analysis of Emission Shapes  

E-Print Network [OSTI]

Shapes of relative emission sources can be accessed by expanding shapes of correlations at low relative velocities in pair center of mass in Cartesian harmonics. Coefficients of expansion for correlations are related to the respective coefficients of expansion for the sources through one dimensional integral transforms involving properties of pair relative wavefunctions. The methodology is illustrated with analyses of NA49 and PHENIX correlation data.

Danielewicz, P

2007-01-01T23:59:59.000Z

290

SYNTHESIS AND CHARACTERIZATION OF PROTON CONDUCTORS  

SciTech Connect (OSTI)

The morphological and electrical properties of yttrium (Y) and indium (In) doped barium cerate perovskites of the form BaIn{sub 0.3-x}Y{sub x}Ce{sub 0.7}O{sub 3-{delta}} (with x=0-0.3) prepared by a modified Pechini method were investigated as potential high temperature proton conductors with improved chemical stability. The sinterability increased with the increase of In-doping, and the perovskite phase was found in the BaIn{sub 0.3-x}Y{sub x}Ce{sub 0.7}O{sub 3-{delta}} solid solutions over the range 0 {le} x {le} 0.3. The conductivities decreased (from x to x, insert quantitative values) while the tolerance to wet CO{sub 2} improved for BaIn{sub 0.3-x}Y{sub x}Ce{sub 0.7}O{sub 3-{delta}} samples with an increase of In-doping.

Brinkman, K.

2010-02-18T23:59:59.000Z

291

RADIATION DAMAGE TO BSCCO-2223 FROM 50 MEV PROTONS  

E-Print Network [OSTI]

B. and Gupta, R. , Radiation Resistant Magnets for the RIARADIATION DAMAGE TO BSCCO-2223 FROM 50 MEV PROTONS A. F.HTS materials in high radiation environments requires that

Zeller, A.F.; Ronningen, R.M.; Godeke, A.; Heilbronn, L.H.; McMahan-Norris, P.; Gupta, R.

2007-01-01T23:59:59.000Z

292

Fabrication of Annealed Proton-Exchanged Waveguides for Vertical Integration  

E-Print Network [OSTI]

There is a drive for improving the surface uniformity of optical waveguide devices in the photonics lab. This report focuses on the exploration of annealed proton exchange (APE) waveguide fabrication on lithium niobate crystal as a method...

Webb, Jacob Douglas

2011-08-08T23:59:59.000Z

293

Predicted Impacts of Proton Temperature Anisotropy on Solar Wind Turbulence  

E-Print Network [OSTI]

Particle velocity distributions measured in the weakly collisional solar wind are frequently found to be non-Maxwellian, but how these non-Maxwellian distributions impact the physics of plasma turbulence in the solar wind remains unanswered. Using numerical solutions of the linear dispersion relation for a collisionless plasma with a bi-Maxwellian proton velocity distribution, we present a unified framework for the four proton temperature anisotropy instabilities, identifying the associated stable eigenmodes, highlighting the unstable region of wavevector space, and presenting the properties of the growing eigenfunctions. Based on physical intuition gained from this framework, we address how the proton temperature anisotropy impacts the nonlinear dynamics of the \\Alfvenic fluctuations underlying the dominant cascade of energy from large to small scales and how the fluctuations driven by proton temperature anisotropy instabilities interact nonlinearly with each other and with the fluctuations of the large-scal...

Klein, Kristopher G

2015-01-01T23:59:59.000Z

294

Comparison of proton and neutron carrier removal rates  

SciTech Connect (OSTI)

Displacement damage induced carrier removal rates for proton irradiations in the energy range 10-175 MeV were compared to 1 MeV equivalent neutrons using power MOSFETs as a test vehicle. The results showed that, within experimental error, the degradation mechanisms were qualitatively similar and the ratio of proton to neutron carrier removal rates as a function of proton energy correlate with a calculation based on nonionization energy loss in silicon. For exposures under junction bias, p-type silicon was found to have a smaller carrier removal rate for both proton and neutron irradiations, whereas, for n-type silicon, junction bias had little effect on the carrier removal rate.

Pease, R.L.; Enlow, E.W.; Dinger, G.L.; Marshall, P.

1987-12-01T23:59:59.000Z

295

Energetics and Dynamics of Electron Transfer and Proton Transfer...  

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

Transfer in Dissociation of Metal III (salen)-Peptide Complexes in the Energetics and Dynamics of Electron Transfer and Proton Transfer in Dissociation of Metal III (salen)-Peptide...

296

Charge Symmetry Breaking and Parity Violating Electron-Proton Scattering  

E-Print Network [OSTI]

Charge symmetry breaking contributions to the proton's neutral weak form factors must be understood in order for future measurements of parity violating electron-proton scattering to be definitively interpreted as evidence of proton strangeness. We calculate these charge symmetry breaking form factor contributions using chiral perturbation theory with resonance saturation estimates for unknown low-energy constants. The uncertainty of the leading-order resonance saturation estimates is reduced by incorporating nuclear physics constraints. Higher-order contributions are investigated through phenomenological vertex form factors. We predict that charge symmetry breaking form factor contributions are an order of magnitude larger than expected from naive dimensional analysis but are still an order of magnitude smaller than current experimental bounds on proton strangeness. This is consistent with previous calculations using chiral perturbation theory with resonance saturation.

Michael Wagman; Gerald A. Miller

2014-12-16T23:59:59.000Z

297

Nuclear binding energies and empirical proton-neutron interactions  

SciTech Connect (OSTI)

By using an exponential function to simulate the residual proton-neutron interaction between valence nucleons, we derive a new set of local mass formulas that are competitive with the Garvey-Kelson mass relations for relating neighboring nuclear masses.

Fu, G. J. [Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China); Jiang Hui [Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China); School of Arts and Science, Shanghai Maritime University, Shanghai 200135 (China); Zhao, Y. M. [Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China); Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000 (China); CCAST, World Laboratory, Post Office Box 8730, Beijing 100080 (China); Pittel, S. [Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States); Arima, A. [Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China); Science Museum, Japan Science Foundation, 2-1 Kitanomaru-koen, Chiyoda-ku, Tokyo 102-0091 (Japan)

2010-09-15T23:59:59.000Z

298

Frster mechanism of electron-driven proton pumps Anatoly Yu. Smirnov,1,2  

E-Print Network [OSTI]

-proton Coulomb interaction can provide a unidirectional flow of protons against an electrochemical proton as electron and proton voltage buildups are obtained taking into account electrostatic forces and noise and transmembrane electrochemical potentials which correspond to the parameters of living cells. DOI: 10.1103/Phys

Nori, Franco

299

Reverse convection and cusp proton aurora: Cluster, polar and image observation  

E-Print Network [OSTI]

Reverse convection and cusp proton aurora: Cluster, polar and image observation Q.-G. Zong a,b,*, TT) at Earth. Cusp proton aurora was caused by the leading phase of the CME. Cusp proton aurora generally of the cusp proton aurora shifted about 30 from dawnside to duskside when IMF By changed from 10 to 5 n

California at Berkeley, University of

300

CERN 6 Tesla superconducting persistent dipole/Filming an experiment/Synchrotron radiation from protons  

E-Print Network [OSTI]

CERN 6 Tesla superconducting persistent dipole/Filming an experiment/Synchrotron radiation from protons

1979-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

On the electron to proton mass ratio and the proton structure  

E-Print Network [OSTI]

We derive an expression for the electron to nucleon mass ratio from a reinterpreted lattice gauge theory Hamiltonian to describe interior baryon dynamics. We use the classical electron radius as our fundamental length scale. Based on expansions on trigonometric Slater determinants for a neutral state a specific numerical result is found to be less than three percent off the experimental value for the neutron. Via the exterior derivative on the Lie group configuration space u(3) we derive approximate parameter free parton distribution functions that compare rather well with those for the u and d valence quarks of the proton.

Ole L. Trinhammer

2014-04-22T23:59:59.000Z

302

Measurement of the Lambda(1405) in proton proton reactions with HADES  

E-Print Network [OSTI]

We present an analysis of the Lambda(1405) resonance in p+p reactions at a kinetic beam energy of 3.5 GeV, measured by the High Acceptance Di-Electron Spectrometer (HADES). The resonance is reconstructed in the two charged decay channels Sigma^(+/-) pi^(-/+), with help of a kinematic refit, which improves the mass resolution. The high misidentification of pions and protons as kaons required the development of a sophisticated sideband analysis, which can describe the misidentification background quite well.

Johannes Siebenson; Laura Fabbietti; Alexander Schmah; Eliane Epple; for the HADES Collaboration

2010-09-05T23:59:59.000Z

303

Measurement of the Lambda(1405) in proton proton reactions with HADES  

E-Print Network [OSTI]

We present an analysis of the Lambda(1405) resonance in p+p reactions at a kinetic beam energy of 3.5 GeV, measured by the High Acceptance Di-Electron Spectrometer (HADES). The resonance is reconstructed in the two charged decay channels Sigma^(+/-) pi^(-/+), with help of a kinematic refit, which improves the mass resolution. The high misidentification of pions and protons as kaons required the development of a sophisticated sideband analysis, which can describe the misidentification background quite well.

Siebenson, Johannes; Schmah, Alexander; Epple, Eliane

2010-01-01T23:59:59.000Z

304

Partnerships to continue moving toward zero emissions  

E-Print Network [OSTI]

Partnerships to continue moving toward zero emissions Zero Emission transportation goals Zero Emission MAP makes available technical assistance to states and cities to support the growth of zero emission mobility markets. 1 Research shows

California at Davis, University of

305

Implementation of SB 1368 Emission Performance  

E-Print Network [OSTI]

........................................................................................................ 18 Calculation of Biomass, Biogas or Landfill Net Emissions ..................................... 19

306

Nanoparticle Emissions from Internal Combustion Engines  

E-Print Network [OSTI]

Nanoparticle Emissions from Internal Combustion Engines Professor David B. Kittelson Department Meeting Ultra Fine Particles in the Atmosphere 15 March 2000 Engine Exhaust Particle Emissions: Some Perkins Engine Company #12;Emissions of Ultrafine and Nanoparticles from Engines Current emission

Minnesota, University of

307

Proton induced fission of 181-Ta at relativistic energies  

E-Print Network [OSTI]

Total fission cross sections of 181-Ta induced by protons at different relativistic energies have been measured at GSI, Darmstadt. The inverse kinematics technique used together with a dedicated set-up, made it possible to determine these cross sections with high accuracy. The new data obtained in this experiment will contribute to the understanding of the fission process at high excitation energies. The results are compared with data from previous experiments and systematics for proton-induced fission cross sections.

Y. Ayyad; J. Benlliure; E. Casarejos; H. lvarez-Pol; A. Bacquias; A. Boudard; M. Caamao; T. Enqvist; V. Fhr; A. Keli?-Heil; K. Kezzar; S. Leray; C. Paradela; D. Prez-Loureiro; R. Pleska?; D. Tarro

2012-03-07T23:59:59.000Z

308

Proton inventory investigations of acyl transfer reactions: transition state structures  

E-Print Network [OSTI]

for Exchangeable Protons (L) in Aqueous Solutions. Calculated Values of kn Based on the Transition State Model Structures of Figures 11, 1Z, and 13 . Pseudo-First Order Rate Constants for the Buffer- Catalyzed Hydrolysis of N-acetyl-1, 2, 4-triazole at pH 4. 7...-acetylimidazole. 18 19 10 Proposed transition state structure for the hydrolysis of N-acetylimidazolium ion. . . . . . . . . . , . . . . . 26 One proton model for the imidazole-catalyzed hydrolysis of N-acetylimidazole . . . . . . . . . . . . . . . . . . 29 LIST...

Patterson, Jacob Floyd

1978-01-01T23:59:59.000Z

309

Single shot cell irradiations with laser-driven protons  

SciTech Connect (OSTI)

Ion beams are relevant for radiobiological studies in basic research and for application in tumor therapy. Here we present a method to generate nanosecond proton bunches with single shot doses of up to 7 Gray by a tabletop high-power laser. Although in their infancy, laser-ion accelerators allow studying fast radiobiological processes at small-scale laboratories as exemplarily demonstrated by measurements of the relative biological effectiveness of protons in human tumor cells.

Humble, N.; Schmid, T. E.; Zlobinskaya, O.; Wilkens, J. J. [Department of Radiation Oncology, Klinikum rechts der Isar, Technische Universitt Mnchen (Germany)] [Department of Radiation Oncology, Klinikum rechts der Isar, Technische Universitt Mnchen (Germany); Allinger, K.; Hilz, P.; Ma, W.; Reinhardt, S. [Physics Department, Ludwig-Maximilians-Universitt Mnchen (Germany)] [Physics Department, Ludwig-Maximilians-Universitt Mnchen (Germany); Bin, J.; Kiefer, D.; Schreiber, J. [Max Planck Institute of Quantum Optics, Garching (Germany)] [Max Planck Institute of Quantum Optics, Garching (Germany); Drexler, G. A.; Friedl, A. [Department of Radiation Oncology, Ludwig-Maximilians-Universitt Mnchen (Germany)] [Department of Radiation Oncology, Ludwig-Maximilians-Universitt Mnchen (Germany)

2013-07-26T23:59:59.000Z

310

Physical and biological factors determining the effective proton range  

SciTech Connect (OSTI)

Purpose: Proton radiotherapy is rapidly becoming a standard treatment option for cancer. However, even though experimental data show an increase of the relative biological effectiveness (RBE) with depth, particularly at the distal end of the treatment field, a generic RBE of 1.1 is currently used in proton radiotherapy. This discrepancy might affect the effective penetration depth of the proton beam and thus the dose to the surrounding tissue and organs at risk. The purpose of this study was thus to analyze the impact of a tissue and dose dependent RBE of protons on the effective range of the proton beam in comparison to the range based on a generic RBE of 1.1.Methods: Factors influencing the biologically effective proton range were systematically analyzed by means of treatment planning studies using the Local Effect Model (LEM IV) and the treatment planning software TRiP98. Special emphasis was put on the comparison of passive and active range modulation techniques.Results: Beam energy, tissue type, and dose level significantly affected the biological extension of the treatment field at the distal edge. Up to 4 mm increased penetration depth as compared to the depth based on a constant RBE of 1.1. The extension of the biologically effective range strongly depends on the initial proton energy used for the most distal layer of the field and correlates with the width of the distal penumbra. Thus, the range extension, in general, was more pronounced for passive as compared to active range modulation systems, whereas the maximum RBE was higher for active systems.Conclusions: The analysis showed that the physical characteristics of the proton beam in terms of the width of the distal penumbra have a great impact on the RBE gradient and thus also the biologically effective penetration depth of the beam.

Grn, Rebecca [Department of Biophysics, GSI Helmholtzzentrum fr Schwerionenforschung, Darmstadt 64291 (Germany) [Department of Biophysics, GSI Helmholtzzentrum fr Schwerionenforschung, Darmstadt 64291 (Germany); Institute of Medical Physics and Radiation Protection, University of Applied Sciences Gieen, Gieen 35390 (Germany); Medical Faculty of Philipps-University Marburg, Marburg 35032 (Germany); Friedrich, Thomas; Krmer, Michael; Scholz, Michael [Department of Biophysics, GSI Helmholtzzentrum fr Schwerionenforschung, Darmstadt 64291 (Germany)] [Department of Biophysics, GSI Helmholtzzentrum fr Schwerionenforschung, Darmstadt 64291 (Germany); Zink, Klemens [Institute of Medical Physics and Radiation Protection, University of Applied Sciences Gieen, Gieen 35390, Germany and Department of Radiotherapy and Radiation Oncology, University Medical Center Giessen and Marburg, Marburg 35043 (Germany)] [Institute of Medical Physics and Radiation Protection, University of Applied Sciences Gieen, Gieen 35390, Germany and Department of Radiotherapy and Radiation Oncology, University Medical Center Giessen and Marburg, Marburg 35043 (Germany); Durante, Marco [Department of Biophysics, GSI Helmholtzzentrum fr Schwerionenforschung, Darmstadt 64291, Germany and Department of Condensed Matter Physics, Darmstadt University of Technology, Darmstadt 64289 (Germany)] [Department of Biophysics, GSI Helmholtzzentrum fr Schwerionenforschung, Darmstadt 64291, Germany and Department of Condensed Matter Physics, Darmstadt University of Technology, Darmstadt 64289 (Germany); Engenhart-Cabillic, Rita [Medical Faculty of Philipps-University Marburg, Marburg 35032, Germany and Department of Radiotherapy and Radiation Oncology, University Medical Center Giessen and Marburg, Marburg 35043 (Germany)] [Medical Faculty of Philipps-University Marburg, Marburg 35032, Germany and Department of Radiotherapy and Radiation Oncology, University Medical Center Giessen and Marburg, Marburg 35043 (Germany)

2013-11-15T23:59:59.000Z

311

Spin structure functions: Proton / deuteron measurements in the resonance region  

SciTech Connect (OSTI)

The RSS experiment ran in Hall C at Jefferson Lab and measured the proton and deuteron beam-target asymmetries for parallel and perpendicular target fields over a W range from pion threshold to 1.9 GeV at Q{sup 2} {approx} 1.3 GeV{sup 2}. Preliminary results for the proton spin structure functions g{sub 1} and g{sub 2} are presented.

Mark Jones; RSS Collaboration

2006-02-01T23:59:59.000Z

312

The Spin of The Proton: Looking Back and Looking Forward  

SciTech Connect (OSTI)

The physics of the spin structure of the proton is reviewed. The EMC experiment and the follow-up ones have shown that the quark spin carries about 1/4 of the spin of the proton. The suspected large gluon polarization is under intense studies with various experimental tools. Generalized parton distributions probed in deeply-virtual Compton scattering allows reconstruction of quark orbital angular momentum.

Ji Xiangdong [Department of Physics, University of Maryland, College Park, MD 20742 (United States)

2006-11-17T23:59:59.000Z

313

Microscopic Optical Potentials for Helium-6 Scattering off Protons  

E-Print Network [OSTI]

The differential cross section and the analyzing power are calculated for elastic scattering of $^6$He from a proton target using a microscopic folding optical potential, in which the $^6$He nucleus is described in terms of a $^4$He-core with two additional neutrons in the valence p-shell. In contrast to previous work of that nature, all contributions from the interaction of the valence neutrons with the target protons are taken into account.

Ch. Elster; A. Orazbayev; S. P. Weppner

2012-09-28T23:59:59.000Z

314

Proton-neutron pairing correlations in the nuclear shell model  

E-Print Network [OSTI]

A shell-model study of proton-neutron pairing in f - p shell nuclei using a parametrized hamiltonian that includes deformation and spin-orbit effects as well as isoscalar and isovector pairing is reported. By working in a shell-model framework we are able to assess the role of the various modes of proton-neutron pairing in the presence of nuclear deformation without violating symmetries. Results are presented for $^{44}$Ti, $^{46}$Ti and $^{48}$Cr.

Lei Yang; S. Pittel; B. Thakur; N. Sandulescu; A. Poves; Yu-Min Zhao

2010-06-16T23:59:59.000Z

315

Introduction to Photoelectron Emission Microscopy: Principles...  

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

Introduction to Photoelectron Emission Microscopy: Principles and Applications. Introduction to Photoelectron Emission Microscopy: Principles and Applications. Abstract: In the...

316

Measurement and Characterization of Unregulated Emissions from...  

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

Measurement and Characterization of Unregulated Emissions from Advanced Technologies Measurement and Characterization of Unregulated Emissions from Advanced Technologies 2011 DOE...

317

Network analysis of proton transfer in liquid water  

SciTech Connect (OSTI)

Proton transfer in macromolecular systems is a fascinating yet elusive process. In the last ten years, molecular simulations have shown to be a useful tool to unveil the atomistic mechanism. Notwithstanding, the large number of degrees of freedom involved make the accurate description of the process very hard even for the case of proton diffusion in bulk water. Here, multi-state empirical valence bond molecular dynamics simulations in conjunction with complex network analysis are applied to study proton transfer in liquid water. Making use of a transition network formalism, this approach takes into account the time evolution of several coordinates simultaneously. Our results provide evidence for a strong dependence of proton transfer on the length of the hydrogen bond solvating the Zundel complex, with proton transfer enhancement as shorter bonds are formed at the acceptor site. We identify six major states (nodes) on the network leading from the special pair to a more symmetric Zundel complex required for transferring the proton. Moreover, the second solvation shell specifically rearranges to promote the transfer, reiterating the idea that solvation beyond the first shell of the Zundel complex plays a crucial role in the process.

Shevchuk, Roman; Rao, Francesco, E-mail: francesco.rao@frias.uni-freiburg.de [Freiburg Institute for Advanced Studies, School of Soft Matter Research, Freiburg im Breisgau (Germany); Agmon, Noam [Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem (Israel)

2014-06-28T23:59:59.000Z

318

JOURNAL OF MAGNETIC RESONANCE 87,620-627 ( 1990) Practical Aspectsof Proton-Carbon-Carbon-Proton Three-  

E-Print Network [OSTI]

JOURNAL OF MAGNETIC RESONANCE 87,620-627 ( 1990) Practical Aspectsof Proton-Carbon-Carbon and demonstrate improvements that greatly reduce their intensity. 0022-2364190 $3.00 Copyright 0 1990 by Academic

Clore, G. Marius

319

Positron Emission Tomography (PET)  

DOE R&D Accomplishments [OSTI]

Positron emission tomography (PET) assesses biochemical processes in the living subject, producing images of function rather than form. Using PET, physicians are able to obtain not the anatomical information provided by other medical imaging techniques, but pictures of physiological activity. In metaphoric terms, traditional imaging methods supply a map of the body's roadways, its, anatomy; PET shows the traffic along those paths, its biochemistry. This document discusses the principles of PET, the radiopharmaceuticals in PET, PET research, clinical applications of PET, the cost of PET, training of individuals for PET, the role of the United States Department of Energy in PET, and the futures of PET.

Welch, M. J.

1990-01-00T23:59:59.000Z

320

Emission control technology  

SciTech Connect (OSTI)

Environmental protection is indispensable for preserving the earth for later generations. Indeed, industrial development has made our life rich; however, it also accelerates environmental pollution. Above all, such global problems as acid rain caused by SOx and NOx emissions and air pollution caused by particulates have become serious in recent years. Countermeasures currently in service or under development for these problems include: upgrading of fuel-burning systems; conversion of energy sources to clean fuels; pretreatment of fuels; and flue gas treatment. This chapter focuses on technologies that treat flue gases including the circumstances of the development of the technologies.

Yamaguchi, Fumihiko

1993-12-31T23:59:59.000Z

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


321

Proton cloud and the possibility of direct perceiving of a Hydrogen nucleon  

E-Print Network [OSTI]

We introduce a concept of proton cloud and calculate the radius of the proton cloud of the Hydrogen atom. Then, we estimate the radius of the proton cloud of a Hydrogen atom on highly excited Rydberg states. Based on the size of proton cloud, the stability of the atom and technical level, we guess that the direct perceiving of the Hydrogen nucleon cloud, or proton cloud, is possible in near future.

Li Yang; Ya-Qi Song

2014-03-30T23:59:59.000Z

322

Measurement of the Strange Quark Contribution to Proton Structure through Parity Violating Electron-Proton Scattering  

SciTech Connect (OSTI)

The G0 (G-Zero) forward angle experiment completed in Hall C of the Thomas Jefferson National Accelerator Facility (TJNAF) has measured the parity violating asymmetries in elastic electron-proton scattering over a Q2 range of 0.12 < Q2 < 1.0 (GeV/c)2. A linear combination of the strange electric (GsE) and magnetic (GsM) form factors calculated from these asymmetries indicate a non-zero contribution of the strange quark to the charge and magnetization structure of the proton in the above kinematic range at a 89% confidence level. The results show a previously unmeasured Q2 dependence of the strange form factors. Combining the G0 results with previous parity violating experiments show that at Q2 = 0.1 (GeV/c)2 GsM = 0.62+-0.31 GsE = -0.013+-0.028 At intermediate Q2 of about 0.23 (GeV/c)2, a consistent value of GsM is seen compared to previous experiments, together with a measurement that may imply a negative value of GsE. For Q2 above 0.5 (GeV/c)2 a consistently positive value for the linear combination of the strange form factors is seen.

Kazutaka Nakahara

2006-05-01T23:59:59.000Z

323

Long-Range Near-Side Angular Correlations in Proton-Proton Interactions in CMS.  

ScienceCinema (OSTI)

The CMS Collaboration Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center of mass energies of 0.9, 2.36 and 7TeV over a broad range of pseudorapidity (?) and azimuthal angle (f) are presented using data collected with the CMS detector at the LHC. Short-range correlations in ??, which are studied in minimum bias events, are characterized using a simple independent cluster parameterization in order to quantify their strength (cluster size) and their extent in ? (cluster decay width). Long-range azimuthal correlations are studied more differentially as a function of charged particle multiplicity and particle transverse momentum using a 980nb-1 data set at 7TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particles in intermediate pT?s of 1-3GeV/c, 2.0< |??|<4.8 and ?f?0. This is the ?rst observation of such a ridge-like feature in two-particle correlation functions in pp or p-pbar collisions. EVO Universe, password "seminar"; Phone Bridge ID: 2330444 Password: 5142

None

2011-10-06T23:59:59.000Z

324

Infrared renormalons and single meson production in proton-proton collisions  

SciTech Connect (OSTI)

In this article, we investigate the contribution of the higher-twist Feynman diagrams to the large-p{sub T} inclusive pion production cross section in proton-proton collisions and present the general formulas for the higher-twist differential cross sections in the case of the running coupling and frozen coupling approaches. The structure of infrared renormalon singularities of the higher-twist subprocess cross section and the resummed expression (the Borel sum) for it are found. We compared the resummed higher-twist cross sections with the ones obtained in the framework of the frozen coupling approach and leading-twist cross section. We obtain, that ratio R=({sigma}{sub {pi}{sup +}}{sup HT}){sup res}/({sigma}{sub {pi}{sup +}}{sup HT}){sup 0}, for all values of the transverse momentum p{sub T} of the pion identically equivalent to ratio r=({delta}{sub {pi}}{sup HT}){sup res}/({delta}{sub {pi}}{sup HT}){sup 0}. It is shown that the resummed result depends on the choice of the meson wave functions used in calculation. Phenomenological effects of the obtained results are discussed.

Ahmadov, A. I. [Institute for Physical Problems, Baku State University, Z. Khalilov Street 23, AZ-1148, Baku (Azerbaijan); Aydin, Coskun; Hakan, Yilmaz A. [Department of Physics, Karadeniz Technical University, Trabzon (Turkey); Nagiyev, Sh. M.; Dadashov, E. A. [Institute of Physics of Azerbaijan National Academy of Sciences, H. Javid Avenue, 33, AZ-1143, Baku (Azerbaijan)

2009-07-01T23:59:59.000Z

325

Search for diphoton events with large missing transverse momentum in 7 TeV protonproton collision data with the ATLAS detector  

E-Print Network [OSTI]

A search for diphoton events with large missing transverse momentum has been performed using protonproton collision data at ?s = 7 TeV recorded with the ATLAS detector, corresponding to an integrated luminosity of 4.8 ...

Taylor, Frank E.

326

Elastic emission polishing  

SciTech Connect (OSTI)

Elastic emission polishing, also called elastic emission machining (EEM), is a process where a stream of abrasive slurry is used to remove material from a substrate and produce damage free surfaces with controlled surface form. It is a noncontacting method utilizing a thick elasto-hydrodynamic film formed between a soft rotating ball and the workpiece to control the flow of the abrasive. An apparatus was built in the Center, which consists of a stationary spindle, a two-axis table for the workpiece, and a pump to circulate the working fluid. The process is controlled by a programmable computer numerical controller (CNC), which presently can operate the spindle speed and movement of the workpiece in one axis only. This apparatus has been used to determine material removal rates on different material samples as a function of time, utilizing zirconium oxide (ZrO{sub 2}) particles suspended in distilled water as the working fluid. By continuing a study of removal rates the process should become predictable, and thus create a new, effective, yet simple tool for ultra-precision mechanical machining of surfaces.

Loewenthal, M.; Loseke, K.; Dow, T.A.; Scattergood, R.O.

1988-12-01T23:59:59.000Z

327

Zero emission coal  

SciTech Connect (OSTI)

We discuss a novel, emission-free process for producing hydrogen or electricity from coal. Even though we focus on coal, the basic design is compatible with any carbonaceous fuel. The process uses cyclical carbonation of calcium oxide to promote the production of hydrogen from carbon and water. The carbonation of the calcium oxide removes carbon dioxide from the reaction products and provides the additional energy necessary to complete hydrogen production without additional combustion of carbon. The calcination of the resulting calcium carbonate is accomplished using the high temperature waste heat from solid oxide fuel cells (SOFC), which generate electricity from hydrogen fuel. Converting waste heat back to useful chemical energy allows the process to achieve very high conversion efficiency from fuel energy to electrical energy. As the process is essentially closed-loop, the process is able to achieve zero emissions if the concentrated exhaust stream of CO{sub 2} is sequestered. Carbon dioxide disposal is accomplished by the production of magnesium carbonate from ultramafic rock. The end products of the sequestration process are stable naturally occurring minerals. Sufficient rich ultramafic deposits exist to easily handle all the world's coal.

Ziock, H.; Lackner, K.

2000-08-01T23:59:59.000Z

328

Surface-electronic-state effects in electron emission from the Be(0001) surface  

SciTech Connect (OSTI)

We study the electron emission produced by swift protons impinging grazingly on a Be(0001) surface. The process is described within a collisional formalism using the band-structure-based (BSB) approximation to represent the electron-surface interaction. The BSB model provides an accurate description of the electronic band structure of the solid and the surface-induced potential. Within this approach we derive both bulk and surface electronic states, with these latter characterized by a strong localization at the crystal surface. We found that such surface electronic states play an important role in double-differential energy- and angle-resolved electron emission probabilities, producing noticeable structures in the electron emission spectra.

Archubi, C. D. [Instituto de Astronomia y Fisica del Espacio, casilla de correo 67, sucursal 28, C1428EGA, Buenos Aires (Argentina); Gravielle, M. S. [Instituto de Astronomia y Fisica del Espacio, casilla de correo 67, sucursal 28, C1428EGA, Buenos Aires (Argentina); Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires (Argentina); Silkin, V. M. [Donostia International Physics Center, E-20018 San Sebastian (Spain); Departamento de Fisica de Materiales, Facultad de Ciencias Quimicas, Universidad del Pais Vasco, Apartado 1072, E-20080 San Sebastian (Spain); IKERBASQUE, Basque Foundation for Science, E-48011 Bilbao (Spain)

2011-07-15T23:59:59.000Z

329

field emission electron microprobe | EMSL  

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

field emission electron microprobe Leads No leads are available at this time. Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. Abstract: As a...

330

EMSL - field emission electron microprobe  

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

field-emission-electron-microprobe en Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. http:www.emsl.pnl.govemslwebpublications...

331

Biodiesel and Pollutant Emissions (Presentation)  

SciTech Connect (OSTI)

Presents the results from three methods of testing--engine, chassis, and PEM--for testing nitrogen oxide (NOx) emissions from B20.

McCormick, R.; Williams, A.; Ireland, J.; Hayes, B.

2006-09-28T23:59:59.000Z

332

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

As part of the state's 1997 electric utility restructuring legislation, Illinois established provisions for the disclosure of fuel mix and emissions data. All electric utilities and alternative...

333

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Virginias 1999 electric industry restructuring law requires the state's electricity providers to disclose -- "to the extent feasible" -- fuel mix and emissions data regarding electric generation....

334

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Ohio's 1999 electric industry restructuring law requires the state's electricity suppliers to disclose details regarding their fuel mix and emissions to customers. Electric utilities and...

335

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Marylands 1999 electric utility restructuring legislation requires all electric companies and electricity suppliers to provide customers with details regarding the fuel mix and emissions of...

336

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Oregon's 1999 electric utility restructuring legislation requires electricity companies and electric service suppliers to disclose details regarding their fuel mix and emissions of electric...

337

Emissions trading under market imperfections.  

E-Print Network [OSTI]

??In this thesis we consider emissions trading under various market imperfections such as uncertainty over permit price, imperfect competition and noncompliance. First, we study the (more)

Lappi, Pauli

2013-01-01T23:59:59.000Z

338

Emissions trading and technological change.  

E-Print Network [OSTI]

??Emissions trading programmes have grown in number and scope over the last forty years, and in the last decade they have become a centrepiece of (more)

Calel, Raphael

2013-01-01T23:59:59.000Z

339

Silicate emission in Orion  

E-Print Network [OSTI]

We present mid-infrared spectro-imagery and high-resolution spectroscopy of the Orion bar and of a region in the Orion nebula. These observations have been obtained in the Guaranteed Time with the Circular Variable Filters of the ISO camera (CAM-CVF) and with the Short Wavelength Spectrometer (SWS), on board the European Infrared Space Observatory (ISO). Our data shows emission from amorphous silicate grains from the entire HII region and around the isolated O9.5V star Theta2 Ori A. The observed spectra can be reproduced by a mixture of interstellar silicate and carbon grains heated by the radiation of the hot stars present in the region. Crystalline silicates are also observed in the Orion nebula and suspected around Theta2 Ori A. They are probably of interstellar origin. The ionization structure and the distribution of the carriers of the Aromatic Infrared Bands (AIBs) are briefly discussed on the basis of the ISO observations.

D. Cesarsky; A. P. Jones; J. Lequeux; L. Verstraete

2000-02-14T23:59:59.000Z

340

Robust optimization of intensity modulated proton therapy  

SciTech Connect (OSTI)

Purpose: Intensity modulated proton therapy (IMPT) is highly sensitive to range uncertainties and uncertainties caused by setup variation. The conventional inverse treatment planning of IMPT optimized based on the planning target volume (PTV) is not often sufficient to ensure robustness of treatment plans. In this paper, a method that takes the uncertainties into account during plan optimization is used to mitigate the influence of uncertainties in IMPT. Methods: The authors use the so-called ''worst-case robust optimization'' to render IMPT plans robust in the face of uncertainties. For each iteration, nine different dose distributions are computed--one each for {+-} setup uncertainties along anteroposterior (A-P), lateral (R-L) and superior-inferior (S-I) directions, for {+-} range uncertainty, and the nominal dose distribution. The worst-case dose distribution is obtained by assigning the lowest dose among the nine doses to each voxel in the clinical target volume (CTV) and the highest dose to each voxel outside the CTV. Conceptually, the use of worst-case dose distribution is similar to the dose distribution achieved based on the use of PTV in traditional planning. The objective function value for a given iteration is computed using this worst-case dose distribution. The objective function used has been extended to further constrain the target dose inhomogeneity. Results: The worst-case robust optimization method is applied to a lung case, a skull base case, and a prostate case. Compared with IMPT plans optimized using conventional methods based on the PTV, our method yields plans that are considerably less sensitive to range and setup uncertainties. An interesting finding of the work presented here is that, in addition to reducing sensitivity to uncertainties, robust optimization also leads to improved optimality of treatment plans compared to the PTV-based optimization. This is reflected in reduction in plan scores and in the lower normal tissue doses for the same coverage of the target volume when subjected to uncertainties. Conclusions: The authors find that the worst-case robust optimization provides robust target coverage without sacrificing, and possibly even improving, the sparing of normal tissues. Our results demonstrate the importance of robust optimization. The authors assert that all IMPT plans should be robustly optimized.

Liu Wei; Zhang Xiaodong; Li Yupeng; Mohan, Radhe [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States)

2012-02-15T23:59:59.000Z

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


341

PROTON-CONDUCTING DENSE CERAMIC MEMBRANES FOR HYDROGEN SEPARATION  

SciTech Connect (OSTI)

This project is aimed at preparation of thin (1-10? m) membranes of a modified strontium ceramic material with improved hydrogen permeance on mesoporous substrates. The research work conducted in this reporting period was focused on the following three aspects: (1) preparation of thick proton-conducting ceramic membranes and synthesis of porous substrates as support for thin proton-conducting ceramic film, (2) setting up RF sputter deposition unit for deposition of thin ceramic films and performing deposition experiments with the sputter deposition unit, and (3) modeling hydrogen permeation through the proton-conducting ceramic membranes. Proton-conducting thulium doped strontium cerate membranes were reproducibly prepared by the citrate method. Mesoporous ceria membranes were fabricated by a sol-gel method. The membranes will be used as the substrate for coating thin strontium cerate films. A magnetron sputter deposition unit was set up and good quality thin metal alloy films were formed on the mesoporous substrates by an alternative deposition method with the sputter deposition unit. A theoretical model has been developed for hydrogen permeation through proton conducting ceramic membranes. This model can be used to quantitatively describe the hydrogen permeation data.

Jerry Y.S. Lin

2001-11-30T23:59:59.000Z

342

Proton ordering in tetragonal and monoclinic H2O ice  

E-Print Network [OSTI]

H2O ice remains one of the most enigmatic materials as its phase diagram reveals up to sixteen solid phases. While the crystal structure of these phases has been determined, the phase boundaries and mechanisms of formation of the proton-ordered phases remain unclear. From high precision measurements of the complex dielectric constant, we probe directly the degree of ordering of the protons in H2O tetragonal ice III and monoclinic ice V down to 80 K. A broadened first-order phase transition is found to occur near 202 K we attribute to a quenched disorder of the protons which causes a continuous disordering of the protons during cooling and metastable behavior. At 126 K the protons in ice III become fully ordered, and for the case of ice V becoming fully ordered at 113 K forming ice XIII. Two triple points are proposed to exist: one at 0.35 GPa and 126 K where ices III, IX and V coexist; and another at 0.35 GPa and 113 K where ices V, IX and XIII coexist. Our findings unravel the underlying mechanism driving th...

Yen, Fei; Berlie, Adam; Liu, Xiaodi; Goncharov, Alexander F

2015-01-01T23:59:59.000Z

343

Energy dependence of W values for protons in hydrogen  

E-Print Network [OSTI]

The mean energy $W$ required to produce an ion pair in molecular hydrogen has been obtained for protons in the energy range between 1 MeV and 4.5 MeV. The W values were derived from the existing experimental data on elastic {\\it $\\pi^-$p} scattering at the beam energy of 40 GeV. In the experiment, the ionization chamber IKAR filled with hydrogen at a pressure of 10 at served simultaneously as a gas target and a detector for recoil protons. For selected events of elastic scattering, the ionization yield produced by recoil protons was measured in IKAR, while the energy was determined kinematically through the scattering angles of the incident particles measured with a system of multi-wire proportional chambers. The ionization produced by $\\alpha$-particles from $\\alpha$-sources of $^{234}$U deposited on the chamber electrodes was used for absolute normalization of the W values. The energy dependence of $W$ for protons in H$_2$ shows an anomalous increase of $W$ with increasing energy in the measured energy range. At the energy of 4.76 MeV, the ionization yield for alpha particles is by 2\\% larger than that for protons.

G. A. Korolev; G. D. Alkhazov; A. V. Dobrovolsky; A. V. Khanzadeev; A. A. Vorobyov

2014-05-22T23:59:59.000Z

344

Going Mobile: Emissions Trading Gets a Boost from Mobile Source Emission Reduction Credits  

E-Print Network [OSTI]

Going Mobile: Emissions Trading Gets a Boost From Mobilehave tested various emissions trading policies to supplementAn Analysis of EPA's Emissions Trading Program, 6 YALE J. ON

Goldschein, Perry S.

1995-01-01T23:59:59.000Z

345

Prediction of average. beta. and. gamma. energies and probabilities of. beta. -delayed neutron emission in the region of fission products  

SciTech Connect (OSTI)

Mean {beta} and {gamma} energies and probabilities of {beta}-delayed neutron emission (P{sub n}) in the region of fission products are calculated using a proton-neutron quasiparticle random-phase approximation nuclear model. {beta}-decay properties of these nuclides are essential input parameters for decay heat calculations for nuclear reactors. The results are compared with recent measurements. Mean energies and the P{sub n} values of {approximately}150 experimentally unknown short-lived isotopes are predicted.

Hirsch, M.; Staudt, A.; Klapdor-Kleingrothaus, H.V. (Max-Planck-Inst. fuer Kernphysik, Heidelberg (Germany))

1992-07-01T23:59:59.000Z

346

Proton Pump Inhibitors and Lower Serum Ferritin Levels in 171 HFEC282Y Homozygotes in the Hemochromatosis and Iron OverloadScreening Study  

E-Print Network [OSTI]

antagonist, than by the proton pump inhibitor lansoprazole.Bomford A (2007) Proton pump inhibitors suppress absorptionPatient compliance with proton pump inhibitor therapy in an

2013-01-01T23:59:59.000Z

347

X-ray Emission from Massive StarsX-ray Emission from Massive Stars David CohenDavid Cohen  

E-Print Network [OSTI]

X-ray Emission from Massive StarsX-ray Emission from Massive Stars David CohenDavid Cohen/s)Velocity (km/s) #12;absorption emission emission occulted emission emission UV telescope side side front back #12;absorption emission emission occulted emission emission UV telescope side side front back #12;The

Cohen, David

348

EMISSIONS TO AIR OPERATIONAL PROCEDURE  

E-Print Network [OSTI]

EMISSIONS TO AIR OPERATIONAL PROCEDURE Swansea University Estates Services Singleton Park Swansea to Air Department: Estates and Facilities Site: All Author: Ambreen Jahangir Approved by: Mark Durdin PURPOSE: To minimise emissions and discharges to air from boilers, fume cupboards, air conditioning

Harman, Neal.A.

349

Hard Excluseive $?$ and $J/?$ Photoproduction off a Proton  

E-Print Network [OSTI]

We study the photoproduction of the vector mesons $\\Phi$ and $J/\\Psi$ off a proton in the kinematical regime of large energies and scattering angles within the framework of perturbative QCD. Our investigations are based on the hard scattering approach. This means that the hadrons are replaced by their valence Fock states and scattering on the partonic level is described by tree graphs in which the large transferred momentum is redistributed between the valence partons via the exchange of hard gluons. We find that the unpolarized photoproduction cross sections are dominated by Compton-scattering-like graphs in which the photon couples to the proton, whereas vector-meson-dominance-like graphs, in which the photon fluctuates into the heavy quark-antiquark pair which then exchanges two gluons with the proton, play a minor role. We give explicit predictions for unpolarized scattering cross sections and compare them with experimental data where possible.

A. T. Goritschnig; B. Melic; K. Passek-Kumericki; W. Schweiger

2014-11-04T23:59:59.000Z

350

Primary Cosmic Ray Proton Flux Measured by AMS-02  

E-Print Network [OSTI]

The Alpha Magnetic Spectrometer (AMS-02) is a high energy particle detector designed to study origin and nature of cosmic rays up to a few TV from space. It was installed on the International Space Station (ISS) on May 19, 2011. During the first two years of operation AMS-02 performed precise measurements of the proton flux. In the low rigidity range, from 1 GV to 20 GV, the proton flux was daily measured with a statistical error less than 1%. In the same rigidity range a gradual decrease due to Solar modulation effect and transit variations due to Solar Flares and Coronal Mass Ejection were also observed. In the rigidity range from 20 GV up to 100 GV instead, AMS-02 data show no drastic variation and the results are consistent with other experiments. Above 100 GV, AMS-02 proton flux exhibits a single power low behavior with no fine structures nor brakes.

C. Consolandi; on Behalf of the AMS-02 Collaboration

2014-02-06T23:59:59.000Z

351

The State of Water in Proton Conducting Membranes  

SciTech Connect (OSTI)

The research carried out under grant No. DE-FG02-07ER46371, "The State of Water in Proton Conducting Membranes", during the period June 1, 2008 -May 31, 2010 was comprised of three related parts. These are: 1. An examination of the state of water in classical proton conduction membranes with the use of deuterium T1 NMR spectroscopy (Allcock and Benesi groups). 2. A dielectric relaxation examination of the behavior of water in classical ionomer membranes (Macdonald program). 3. Attempts to synthesize new proton-conduction polymers and membranes derived from the polyphosphazene system. (Allcock program) All three are closely related, crucial aspects of the design and development of new and improved polymer electrolyte fuel cell membranes on which the future of fuel cell technology for portable applications depends.

Allcock, Harry R., Benesi, Alan, Macdonald, Digby, D.

2010-08-27T23:59:59.000Z

352

Laser photon merging in proton-laser collisions  

E-Print Network [OSTI]

The quantum electrodynamical vacuum polarization effects arising in the collision of a high-energy proton beam and a strong, linearly polarized laser field are investigated. The probability that laser photons merge into one photon by interacting with the proton`s electromagnetic field is calculated taking into account the laser field exactly. Asymptotics of the probability are then derived according to different experimental setups suitable for detecting perturbative and nonperturbative vacuum polarization effects. The experimentally most feasible setup involves the use of a strong optical laser field. It is shown that in this case measurements of the polarization of the outgoing photon and and of its angular distribution provide promising tools to detect these effects for the first time.

A. Di Piazza; K. Z. Hatsagortsyan; C. H. Keitel

2009-06-30T23:59:59.000Z

353

Experimental nanocalorimetry of protonated and deprotonated water clusters  

SciTech Connect (OSTI)

An experimental nanocalorimetric study of mass selected protonated (H{sub 2}O){sub n}H{sup +} and deprotonated (H{sub 2}O){sub n?1}OH{sup ?} water clusters is reported in the size range n = 20118. Water cluster's heat capacities exhibit a change of slope at size dependent temperatures varying from 90 to 140 K, which is ascribed to phase or structural transition. For both anionic and cationic species, these transition temperatures strongly vary at small sizes, with higher amplitude for protonated than for deprotonated clusters, and change more smoothly above roughly n ? 35. There is a correlation between bonding energies and transition temperatures, which is split in two components for protonated clusters while only one component is observed for deprotonated clusters. These features are tentatively interpreted in terms of structural properties of water clusters.

Boulon, Julien; Braud, Isabelle; Zamith, Sbastien; Labastie, Pierre; LHermite, Jean-Marc [Universit de Toulouse, UPS, Laboratoire Collisions Agrgats Ractivit, IRSAMC, F-31062 Toulouse (France) [Universit de Toulouse, UPS, Laboratoire Collisions Agrgats Ractivit, IRSAMC, F-31062 Toulouse (France); CNRS, UMR 5589, F-31062 Toulouse (France)

2014-04-28T23:59:59.000Z

354

The Proton Form Factor Ratio Measurements at Jefferson Lab  

SciTech Connect (OSTI)

The ratio of the proton form factors, G{sub Ep}/G{sub Mp}, has been measured from Q{sup 2} of 0.5 GeV{sup 2} to 8.5 GeV{sup 2}, at the Jefferson Laboratory, using the polarization transfer method. This ratio is extracted directly from the measured ratio of the transverse and longitudinal polarization components of the recoiling proton in elastic electron-proton scattering. The discovery that the proton form factor ratio measured in these experiments decreases approximately linearly with four-momentum transfer, Q{sup 2}, for values above #25;~1 GeV{sup 2}, is one of the most significant results to come out of JLab. These results have had a large impact on progress in hadronic physics; and have required a significant rethinking of nucleon structure. The increasingly common use of the double-polarization technique to measure the nucleon form factors, in the last 15 years, has resulted in a dramatic improvement of the quality of all four nucleon electromagnetic form factors, G{sub Ep}, G{sub Mp}, G{sub En} and G{sub Mn}. There is an approved experiment at JLab, GEP(V), to continue the ratio measurements to 12 GeV{sup 2}. A dedicated experimental setup, the Super Bigbite Spectrometer (SBS), will be built for this purpose. It will be equipped with a focal plane polarimeter to measure the polarization of the recoil protons. The scattered electrons will be detected in an electromagnetic calorimeter. In this presentation, I will review the status of the proton elastic electromagnetic form factors and discuss a number of theoretical approaches to describe nucleon form factors.

Punjabi, Vina A. [Norfolk State University, Norfolk, VA (United States); Perdrisat, Charles F. [William and Mary College, Williamsburg, VA (United States)

2014-03-01T23:59:59.000Z

355

COMPARATIVE STUDIES OF PROTON ACCELERATORS FOR HIGH POWER APPLICATIONS.  

SciTech Connect (OSTI)

There are many applications requiring high power proton accelerators of various kinds. However, each type of proton accelerator can only provide beam with certain characteristics, hence the match of accelerators and their applications need careful evaluation. In this talk, the beam parameters and performance limitations of linac, cyclotron, synchrotron, and FFAG accelerators are studied and their relative merits for application in neutron, muon, neutrino, and ADS will be assessed in terms of beam energy, intensity, bunch length, repetition rate, and beam power requirements. A possible match between the applications and the accelerator of choice is presented in a matrix form. The accelerator physics and technology issues and challenges involved will also be discussed.

WENG, W.T.

2006-05-29T23:59:59.000Z

356

Neutron-proton mass difference in isospin asymmetric nuclear matter  

E-Print Network [OSTI]

Isospin-breaking effects in the baryonic sector are studied in the framework of a medium-modified Skyrme model. The neutron-proton mass difference in infinite, asymmetric nuclear matter is discussed. In order to describe the influence of the nuclear environment on the skyrmions, we include energy-dependent charged and neutral pion optical potentials in the s- and p-wave channels. The present approach predicts that the neutron-proton mass difference is mainly dictated by its strong part and that it strongly decreases in neutron matter.

Ulf-G. Meiner; A. M. Rakhimov; A. Wirzba; U. T. Yakhshiev

2007-05-24T23:59:59.000Z

357

Polarisation Transfer in Proton Compton Scattering at High Momentum Transfer  

SciTech Connect (OSTI)

The Jefferson Lab Hall A experiment E99-114 comprised a series of measurements to explore proton Compton scattering at high momentum transfer. For the first time, the polarisation transfer observables in the p (~ 0 ~ p) reaction were measured in the GeV energy range, where it is believed that quark-gluon degrees of freedom begin to dominate. The experiment utilised a circularly polarised photon beam incident on a liquid hydrogen target, with the scattered photon and recoil proton detected in a lead-glass calorimeter and a magnetic spectrometer, respectively.

David Hamilton

2004-12-31T23:59:59.000Z

358

All-solid-state proton battery using gel polymer electrolyte  

SciTech Connect (OSTI)

A proton conducting gel polymer electrolyte system; PMMA+NH{sub 4}SCN+EC/PC, has been prepared. The highest ionic conductivity obtained from the system is 2.5 10?4 S cm{sup ?1}. The optimized composition of the gel electrolyte has been used to fabricate a proton battery with Zn/ZnSO{sub 4}?7H{sub 2}O anode and MnO{sub 2} cathode. The open circuit voltage of the battery is 1.4 V and the highest energy density is 5.7 W h kg?1 for low current drain.

Mishra, Kuldeep, E-mail: mishkuldeep@gmail.com [Department of Applied Science and Humanities, ABES Engineering College, Ghaziabad-201009, India and Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida-201307 (India); Pundir, S. S.; Rai, D. K. [Department of Physics and Materials Science and Engineering, Jaypee Institute of Information Technology, Noida-201307 (India)

2014-04-24T23:59:59.000Z

359

Near-threshold photoproduction of $?(1520)$ from protons and deuterons  

E-Print Network [OSTI]

Photoproduction of $\\Lambda$(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8 LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K$^{+/0}$ angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge invariance. This interpretation was compatible with the differential cross sections, decay asymmetry, and photon beam asymmetry measured in the production from protons at forward K$^+$ angles.

LEPS Collaboration; N. Muramatsu; J. Y. Chen; W. C. Chang; D. S. Ahn; J. K. Ahn; H. Akimune; Y. Asano; S. Dat; H. Ejiri; H. Fujimura; M. Fujiwara; S. Fukui; S. Hasegawa; K. Hicks; K. Horie; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; Y. Kato; H. Kawai; K. Kino; H. Kohri; N. Kumagai; S. Makino; T. Matsuda; T. Matsumura; N. Matsuoka; T. Mibe; M. Miyabe; M. Miyachi; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; H. Ohkuma; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; P. M. Shagin; Y. Shiino; H. Shimizu; Y. Sugaya; M. Sumihama; Y. Toi; H. Toyokawa; A. Wakai; C. W. Wang; S. C. Wang; K. Yonehara; T. Yorita; M. Yoshimura; M. Yosoi; R. G. T. Zegers

2009-04-14T23:59:59.000Z

360

Laser assisted proton collision on light nuclei at moderate energies  

E-Print Network [OSTI]

We present analytic angular differential cross section model for laser assisted proton nucleon scattering on a Woods-Saxon optical potential where the nth-order photon absorption is taken into account simultaneously. As a physical example we calculate cross sections for proton - $^{12}$C collision at 49 MeV in the laboratory frame where the laser intensity is in the range of $ 10^{7} - 10^{21}$ W/cm$^2$ at optical frequencies. The upper intensity limit is slightly below the relativistic regime.

I. F Barna; S. Varro

2014-06-24T23:59:59.000Z

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


361

Exotic modes of excitation in proton rich nuclei  

SciTech Connect (OSTI)

The framework of relativistic energy density functional has been applied in description of excitation phenomena in nuclei close to the proton drip line. In particular, low-lying dipole excitations have been studied using relativistic quasiparticle random phase approximation, based on effective Lagrangians with density dependent meson nucleon couplings. In the isovector dipole channel, the occurrence of pronounced low-lying dipole peaks is predicted, corresponding to the proton pygmy dipole resonance. Since this exotic mode still awaits its experimental confirmation, systematic calculations have been conducted within a pool of neutron deficient nuclei, in order to identify the best possible candidates for measurements.

Paar, N. [Physics Department, Faculty of Science, University of Zagreb (Croatia)

2011-11-30T23:59:59.000Z

362

Present Status of the TAC Proton Accelerator Proposal  

SciTech Connect (OSTI)

Recently, conceptual design of the Turkic Accelerator Center (TAC) proposal was completed. The main goal of this proposal is a charm factory that consist of a linac-ring type electron-positron collider. In addition, synchrotron radiation from the positron ring, free electron laser from the electron linac and a GeV energy proton accelerator are proposed. The Project related with this proposal has been accepted by the Turkish State Planning Committee. It is planned that the Tecnical Design Repotr of the TAC will have been written in the next three years. In this study we consider main parameters of the TAC proton accelerator, secondary beams and their applications.

Akkus, B. [Istanbul Ueniversitesi, Istanbul (Turkey); Bilgin, P. S.; Caliskan, A.; Yilmaz, M. [Gazi Ueniversitesi, Ankara (Turkey); Sultansoy, S. [Gazi Ueniversitesi, Ankara (Turkey); Institute of Physics, Baku (Azerbaijan)

2007-04-23T23:59:59.000Z

363

Proton Channel Orientation in Block-Copolymer Electrolyte Membranes  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassive Solar HomePromising Science for PlutoniumAbout Us / OurBioscience:ProtonProton

364

Separable Representation of Proton-Nucleus Optical Potentials  

E-Print Network [OSTI]

Recently, a new approach for solving the three-body problem for (d,p) reactions in the Coulomb-distorted basis in momentum space was proposed. Important input quantities for such calculations are the scattering matrix elements for proton- and neutron-nucleus scattering. We present a generalization of the Ernst-Shakin-Thaler scheme in which a momentum space separable representation of proton-nucleus scattering matrix elements can be calculated in the Coulomb basis. The viability of this method is demonstrated by comparing S-matrix elements obtained for p$+^{48}$Ca and p$+^{208}$Pb for a phenomenological optical potential with corresponding coordinate space calculations.

L. Hlophe; V. Eremenko; Ch. Elster; F. M. Nunes; G. Arbanas; J. E. Escher; I. J. Thompson

2014-09-14T23:59:59.000Z

365

Proton Channel Orientation in Block-Copolymer Electrolyte Membranes  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - SeptemberMicroneedlesAdvanced Photon Source ThecharacterizationofProtonProton

366

Proton Channel Orientation in Block-Copolymer Electrolyte Membranes  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - SeptemberMicroneedlesAdvanced Photon SourceProton Channel Orientation inProton

367

Proton Dripping Tests a Fundamental Force of Nature  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - SeptemberMicroneedlesAdvanced Photon SourceProton Channel OrientationProton

368

Rapid Proton Transfer Mediated by a Strong Laser Field  

SciTech Connect (OSTI)

Kinetic energy distributions of H{sup +} ejected from a polyatomic molecule, anthraquinone, subjected to 60 fs, 800 nm laser pulses of intensity between 0.2 and 4.0x10{sup 14} W{center_dot}cm{sup -2}, reveal field-driven restructuring of the molecule prior to Coulomb explosion. Calculations demonstrate fast intramolecular proton migration into a field-dressed metastable potential energy minimum. The proton migration occurs in the direction perpendicular to the polarization of the laser field. Rapid field-mediated isomerization is an important new phenomenon in coupling of polyatomic molecules with intense lasers.

Markevitch, Alexei N.; Levis, Robert J. [Department of Chemistry, Center for Advanced Photonics Research, Temple University, Philadelphia, Pennsylvania 19122 (United States); Romanov, Dmitri A. [Department of Physics, Center for Advanced Photonics Research, Temple University, Philadelphia, Pennsylvania 19122 (United States); Smith, Stanley M. [Department of Chemistry, Wayne State University, Detroit, Michigan 48202 (United States)

2006-04-28T23:59:59.000Z

369

Emission Inventories and Projections  

SciTech Connect (OSTI)

When the Executive Body to the Convention on Long-range Transboundary Air Pollution took the decision to establish the Task Force on Hemispheric Transport of Air Pollution (TF HTAP) in December 2004, it was on the basis of a growing understanding of the issues surrounding the hemispheric and intercontinental transport of air pollutants. It was recognised that whilst current regional emissions on their own created pollution levels that exceeded internationally-agreed air quality objectives, hemispheric transport could exacerbate local and regional air quality problems.Two particular pollutants of concern, and the focus of this report, are ozone and particulate matter (PM), known for their detrimental impacts on human health (these impacts and others are described in Chapter 5). There was well-documented evidence for the intercontinental transport of ozone and PM but, at that time, the significance of this intercontinental influence on the design of air pollution control policies was not well understood. The European Union, in drawing up its Thematic Strategy on Clean Air for Europe during 2004, became aware of the significance of intercontinental transport and the importance of sources of pollution beyond its borders and sphere of influence, in meeting its air quality goals.

Streets, D. G.; van Aardenne, John; Battye, Bill; Garivait, Savitri; Grano, D.; Guenther, Alex; Klimont, Z.; Lamarque, Jean-Francois; Lu, Zifeng; Maenhout, Greet; Ohara, Toshimasa; Parrish, David J.; Smith, Steven J.; Vallack, Harry

2011-04-21T23:59:59.000Z

370

Generalized local emission tomography  

DOE Patents [OSTI]

Emission tomography enables locations and values of internal isotope density distributions to be determined from radiation emitted from the whole object. In the method for locating the values of discontinuities, the intensities of radiation emitted from either the whole object or a region of the object containing the discontinuities are inputted to a local tomography function .function..sub..LAMBDA..sup.(.PHI.) to define the location S of the isotope density discontinuity. The asymptotic behavior of .function..sub..LAMBDA..sup.(.PHI.) is determined in a neighborhood of S, and the value for the discontinuity is estimated from the asymptotic behavior of .function..sub..LAMBDA..sup.(.PHI.) knowing pointwise values of the attenuation coefficient within the object. In the method for determining the location of the discontinuity, the intensities of radiation emitted from an object are inputted to a local tomography function .function..sub..LAMBDA..sup.(.PHI.) to define the location S of the density discontinuity and the location .GAMMA. of the attenuation coefficient discontinuity. Pointwise values of the attenuation coefficient within the object need not be known in this case.

Katsevich, Alexander J. (Los Alamos, NM)

1998-01-01T23:59:59.000Z

371

Observation of a diffractive contribution to dijet production in proton-proton collisions at ?s=7??TeV  

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

The cross section for dijet production in proton-proton collisions at ?s =7??TeV is presented as a function of of ?, a variable that approximates the fractional momentum loss of the scattered proton in single-diffractive events. The analysis is based on an integrated luminosity of 2.7??nb?1 collected with the CMS detector at the LHC at low instantaneous luminosities, and uses events with jet transverse momentum of at least 20 GeV. The dijet cross section results are compared to the predictions of diffractive and nondiffractive models. The low-of ? data show a significant contribution from diffractive dijet production, observed for the first time at the LHC. The associated rapidity gap survival probability is estimated.

Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Aguilo, E.; Bergauer, T.; Dragicevic, M.; Er, J.; Fabjan, C.; Friedl, M.; Frhwirth, R.; Ghete, V. M.; Hammer, J.; Hrmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knnz, V.; Krammer, M.; Krtschmer, I.; Liko, D.; Mikulec, I.; Pernicka, M.; Rahbaran, B.; Rohringer, C.; Rohringer, H.; Schfbeck, R.; Strauss, J.; Taurok, A.; Waltenberger, W.; Walzel, G.; Widl, E.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Luyckx, S.; Mucibello, L.; Ochesanu, S.; Roland, B.; Rougny, R.; Selvaggi, M.; Staykova, Z.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Blekman, F.; Blyweert, S.; DHondt, J.; Gonzalez Suarez, R.; Kalogeropoulos, A.; Maes, M.; Olbrechts, A.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Clerbaux, B.; De Lentdecker, G.; Dero, V.; Gay, A. P. R.; Hreus, T.; Lonard, A.; Marage, P. E.; Mohammadi, A.; Reis, T.; Thomas, L.; Vander Marcken, G.; Vander Velde, C.; Vanlaer, P.; Wang, J.; Adler, V.; Beernaert, K.; Cimmino, A.; Costantini, S.; Garcia, G.; Grunewald, M.; Klein, B.; Lellouch, J.; Marinov, A.; Mccartin, J.; Ocampo Rios, A. A.; Ryckbosch, D.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Verwilligen, P.; Walsh, S.; Yazgan, E.; Zaganidis, N.; Basegmez, S.; Bruno, G.; Castello, R.; Ceard, L.; Delaere, C.; du Pree, T.; Favart, D.; Forthomme, L.; Giammanco, A.; Hollar, J.; Lemaitre, V.; Liao, J.; Militaru, O.; Nuttens, C.; Pagano, D.; Pin, A.; Piotrzkowski, K.; Schul, N.; Vizan Garcia, J. M.; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Alves, G. A.; Correa Martins Junior, M.; De Jesus Damiao, D.; Martins, T.; Pol, M. E.; Souza, M. H. G.; Ald Jnior, W. L.; Carvalho, W.; Custdio, A.; Da Costa, E. M.; De Oliveira Martins, C.; Fonseca De Souza, S.; Matos Figueiredo, D.; Mundim, L.; Nogima, H.; Oguri, V.; Prado Da Silva, W. L.; Santoro, A.; Soares Jorge, L.; Sznajder, A.; Anjos, T. S.; Bernardes, C. A.; Dias, F. A.; Fernandez Perez Tomei, T. R.; Gregores, E. M.; Lagana, C.; Marinho, F.; Mercadante, P. G.; Novaes, S. F.; Padula, Sandra S.; Genchev, V.; Iaydjiev, P.; Piperov, S.; Rodozov, M.; Stoykova, S.; Sultanov, G.; Tcholakov, V.; Trayanov, R.; Vutova, M.; Dimitrov, A.; Hadjiiska, R.; Kozhuharov, V.; Litov, L.; Pavlov, B.; Petkov, P.; Bian, J. G.; Chen, G. M.; Chen, H. S.; Jiang, C. H.; Liang, D.; Liang, S.; Meng, X.; Tao, J.; Wang, J.; Wang, X.; Wang, Z.; Xiao, H.; Xu, M.; Zang, J.; Zhang, Z.; Asawatangtrakuldee, C.; Ban, Y.; Guo, S.; Guo, Y.; Li, W.; Liu, S.; Mao, Y.; Qian, S. J.; Teng, H.; Wang, D.; Zhang, L.; Zhu, B.; Zou, W.; Avila, C.; Gomez, J. P.; Gomez Moreno, B.; Osorio Oliveros, A. F.; Sanabria, J. C.; Godinovic, N.; Lelas, D.; Plestina, R.; Polic, D.; Puljak, I.; Antunovic, Z.; Kovac, M.; Brigljevic, V.; Duric, S.; Kadija, K.; Luetic, J.; Morovic, S.; Attikis, A.; Galanti, M.; Mavromanolakis, G.; Mousa, J.; Nicolaou, C.; Ptochos, F.; Razis, P. A.; Finger, M.; Finger, M.; Assran, Y.; Elgammal, S.; Ellithi Kamel, A.; Khalil, S.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Mntel, M.; Raidal, M.; Rebane, L.; Tiko, A.; Eerola, P.; Fedi, G.; Voutilainen, M.; Hrknen, J.; Heikkinen, A.; Karimki, V.; Kinnunen, R.; Kortelainen, M. J.; Lampn, T.; Lassila-Perini, K.; Lehti, S.; Lindn, T.; Luukka, P.; Menp, T.; Peltola, T.; Tuominen, E.; Tuominiemi, J.; Tuovinen, E.; Ungaro, D.; Wendland, L.; Banzuzi, K.; Karjalainen, A.; Korpela, A.; Tuuva, T.; Besancon, M.; Choudhury, S.; Dejardin, M.; Denegri, D.; Fabbro, B.; Faure, J. L.; Ferri, F.; Ganjour, S.; Givernaud, A.; Gras, P.; Hamel de Monchenault, G.; Jarry, P.; Locci, E.; Malcles, J.; Millischer, L.; Nayak, A.; Rander, J.; Rosowsky, A.; Shreyber, I.; Titov, M.; Baffioni, S.; Beaudette, F.; Benhabib, L.; Bianchini, L.; Bluj, M.; Broutin, C.; Busson, P.; Charlot, C.; Daci, N.; Dahms, T.; Dobrzynski, L.; Granier de Cassagnac, R.; Haguenauer, M.; Min, P.; Mironov, C.; Naranjo, I. N.; Nguyen, M.; Ochando, C.; Paganini, P.; Sabes, D.; Salerno, R.; Sirois, Y.; Veelken, C.; Zabi, A.; Agram, J.-L.; Andrea, J.; Bloch, D.; Bodin, D.; Brom, J.-M.; Cardaci, M.; Chabert, E. C.; Collard, C.; Conte, E.; Drouhin, F.; Ferro, C.; Fontaine, J.-C.; Gel, D.; Goerlach, U.; Juillot, P.; Le Bihan, A.-C.; Van Hove, P.; Fassi, F.; Mercier, D.; Beauceron, S.; Beaupere, N.; Bondu, O.; Boudoul, G.; Chasserat, J.; Chierici, R.; Contardo, D.; Depasse, P.; El Mamouni, H.; Fay, J.; Gascon, S.; Gouzevitch, M.; Ille, B.; Kurca, T.; Lethuillier, M.; Mirabito, L.; Perries, S.; Sordini, V.; Tschudi, Y.; Verdier, P.; Viret, S.; Tsamalaidze, Z.; Anagnostou, G.; Beranek, S.; Edelhoff, M.; Feld, L.; Heracleous, N.; Hindrichs, O.; Jussen, R.; Klein, K.; Merz, J.

2013-01-01T23:59:59.000Z

372

Relationship Between Composition and Toxicity of Engine Emissions...  

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

Emissions Relationship Between Composition and Toxicity of Engine Emissions 2004 Diesel Engine Emissions Reduction (DEER) Conference Presentation: Lovelace Respiratory Research...

373

The supply chain of CO2 emissions  

E-Print Network [OSTI]

In almost all cases, the emissions related to traded fuelsextraction (F Er ) and production (F Pr ) emissions (i.e. ,the net effect of emissions from traded fossil fuels; Top),

Davis, S. J; Peters, G. P; Caldeira, K.

2011-01-01T23:59:59.000Z

374

Recent increases in global HFC-23 emissions  

E-Print Network [OSTI]

of U.S. greenhouse gas emissions and sinks: 1990-2007, Rep.A. Lindley (2007), Global emissions of HFC-23 estimated to2009), Greenhouse Gas Emissions Data, http://unfccc.int/ghg_

2010-01-01T23:59:59.000Z

375

Reducing Greenhouse Emissions and Fuel Consumption  

E-Print Network [OSTI]

that energy use and CO2 emissions in developed countries w icap-and-trade program for CO2 emissions from the electricalout and "sequester" the CO2 emissions, though the cost and

Shaheen, Susan; Lipman, Timothy

2007-01-01T23:59:59.000Z

376

Reducing Greenhouse Emissions and Fuel Consumption  

E-Print Network [OSTI]

estimated to produce CO2 emission reductions ranging frombetween low CO2 emissions and the reductions in the auto usea 16 percent reduction in CO2 traffic emissions within the

Shaheen, Susan; Lipman, Timothy

2007-01-01T23:59:59.000Z

377

China Energy and Emissions Paths to 2030  

E-Print Network [OSTI]

Electricity Saving and CO2 Emission Reduction in the Cementfor Fuel Saving and CO2 Emission Reduction in the Iron andElectricity Saving and CO2 Emission Reduction in the Iron

Fridley, David

2012-01-01T23:59:59.000Z

378

Appendix: Mercury Emissions used in CAM-Chem/Hg model. 1. Anthropogenic emissions  

E-Print Network [OSTI]

Appendix: Mercury Emissions used in CAM-Chem/Hg model. 1. Anthropogenic emissions The anthropogenic emission of mercury is directly adopted from global mercury emission inventory [Pacyna et al., 2005]. The anthropogenic emissions are shown in annual averaged total mercury emissions. (Unit: µg/m2 /day) 2. Land

Meskhidze, Nicholas

379

Wildland fire emissions, carbon, and climate: U.S. emissions inventories Narasimhan K. Larkin a,  

E-Print Network [OSTI]

Wildland fire emissions, carbon, and climate: U.S. emissions inventories Narasimhan K. Larkin a: Fire emissions Emissions inventories Greenhouse gases a b s t r a c t Emissions from wildland fire fire emissions change considerably due to fluctuations from year to year with overall fire season

380

Origin of the high energy proton component below the geomagnetic cutoff in near earth orbit  

E-Print Network [OSTI]

The high flux proton component observed by AMS below the geomagnetic cutoff can be well accounted for by assuming these particles to be secondaries originating from the interaction of Cosmic Ray protons with the atmosphere. Simulation results are reported

L. Derome; M. Buenerd; A. Barrau; A. Bouchet; A. Menchaca-Rocha; T. Thuillier

2000-07-24T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

New Polymeric Proton Conductors for Water-free and High-temperature...  

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

New Polymeric Proton Conductors for Water-free and High-temperature Fuel Cells New Polymeric Proton Conductors for Water-free and High-temperature Fuel Cells Presentation on New...

382

Proton dose assessment to the human eye using Monte Carlo n-particle transport code (MCNPX)  

E-Print Network [OSTI]

The objective of this project was to develop a simple MCNPX model of the human eye to approximate dose delivered from proton therapy. The calculated dose included that due to proton interactions and secondary interactions, which included multiple...

Oertli, David Bernhardt

2009-05-15T23:59:59.000Z

383

E-Print Network 3.0 - astrophysical rapid proton-capture Sample...  

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

Neutron and proton capture reactions... explosions 3, as well ass type I X-ray bursts (rapid proton capture process, rp-process) 4, and might... iron 2. Meanwhile...

384

E-Print Network 3.0 - advanced protonic conductor Sample Search...  

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

tions as a light-driven proton pump 2. The results... described below refer to bacte- ria in circumstances such that the light- driven proton pump is their ... Source:...

385

MATERIAL STUDIES FOR PULSED HIGH-INTENSITY PROTON BEAM TARGETS  

E-Print Network [OSTI]

/mechanical property changes experiment for baseline materials Carbon-Carbon composite This low-Z composite gives;PHASE I: Graphite & Carbon-Carbon Targets #12;E951 Results: ATJ Graphite vs. Carbon-Carbon CompositePLAN MATERIAL STUDIES FOR PULSED HIGH-INTENSITY PROTON BEAM TARGETS Nicholas Simos, Harold Kirk

McDonald, Kirk

386

Proton spectroscopy of 48Ni, 46Fe, and 44Cr  

E-Print Network [OSTI]

Results of decay spectroscopy on nuclei in vicinity of the doubly magic 48Ni are presented. The measurements were performed with a Time Projection Chamber with optical readout which records tracks of ions and protons in the gaseous volume. Six decays of 48Ni including four events of two-proton ground-state radioactivity were recorded. An advanced reconstruction procedure yielded the 2p decay energy for 48Ni of Q2p = 1.29(4) MeV. In addition, the energy spectra of \\b{eta}-delayed protons emitted in the decays of 44Cr and 46Fe, as well as half-lives and branching ratios were determined. The results were found to be consistent with the previous measurements made with Si detectors. A new proton line in the decay of 44Cr corresponding to the decay energy of 760 keV is reported. The first evidence for the \\b{eta}2p decay of 46 Fe, based on one clear event, is shown.

M. Pomorski; M. Pftzner; W. Dominik; R. Grzywacz; A. Stolz; T. Baumann; J. S. Berryman; H. Czyrkowski; R. D?browski; A. Fija?kowska; T. Ginter; J. Johnson; G. Kami?ski; N. Larson; S. N. Liddick; M. Madurga; C. Mazzocchi; S. Mianowski; K. Miernik; D. Miller; S. Paulauskas; J. Pereira; K. P. Rykaczewski; S. Suchyta

2014-07-06T23:59:59.000Z

387

Nature and Quantization of the Proton Mass: An Electromagnetic Model  

E-Print Network [OSTI]

A method for quantization of the proton mass is here addressed, which provides a plausible explanation for the origin of mass and leads to the unification of mass and electric charge through their coupling. By means of an electromagnetic approach, the calculated mass of the proton closely approximates its experimental value and does so with dependence on a single parameter. That is to say, the proposed fundamental system provides a way to comprehend the source of mass as a property of the structure of elementary particles. It brings a new tool to the task of gaining insight into the proton mass and to unravelling the enigma of proton stability. The inner energy of elementary particles, or equivalently their mass, is surmised here to have electrodynamic roots, deriving from the dynamics of a single or pair of electric charge(s) shaping out their structure. Mass appears as the quantized balance of two inner energies which conform collapsing action and retentive reaction. Charge and mass are not taken as independent entities as in the traditional mode, instead mass appears as a by-product of the charge structural dynamics, as does the magnetic moment. The proposed model clearly requires a degree of willingness to consider possibilities not accounted for within the framework of the Standard Model. So, this proposal is addressed to those who are open to inspect a different look at the structure of elementary particles and disposed to compare the two approaches, standing out of doctrinal captivity.

G. Sardin

2005-12-14T23:59:59.000Z

388

Fast neutron production from lithium converters and laser driven protons  

SciTech Connect (OSTI)

Experiments to generate neutrons from the {sup 7}Li(p,n){sup 7}Be reaction with 60 J, 180 fs laser pulses have been performed at the Texas Petawatt Laser Facility at the University of Texas at Austin. The protons were accelerated from the rear surface of a thin target membrane using the target-normal-sheath-acceleration mechanism. The neutrons were generated in nuclear reactions caused by the subsequent proton bombardment of a pure lithium foil of natural isotopic abundance. The neutron energy ranged up to 2.9 MeV. The total yield was estimated to be 1.6 10{sup 7} neutrons per steradian. An extreme ultra-violet light camera, used to image the target rear surface, correlated variations in the proton yield and peak energy to target rear surface ablation. Calculations using the hydrodynamics code FLASH indicated that the ablation resulted from a laser pre-pulse of prolonged intensity. The ablation severely limited the proton acceleration and neutron yield.

Storm, M.; Jiang, S.; Wertepny, D.; Orban, C.; Morrison, J.; Willis, C.; McCary, E.; Balencourt, P.; Snyder, J.; Chowdhury, E.; Freeman, R. R.; Akli, K. [Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210 (United States)] [Department of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210 (United States); Bang, W.; Gaul, E.; Dyer, G.; Ditmire, T. [Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin, Austin, Texas 78712 (United States)] [Department of Physics, Center for High Energy Density Science, C1510, University of Texas at Austin, Austin, Texas 78712 (United States)

2013-05-15T23:59:59.000Z

389

Neutron-Proton High-Energy Charge Exchange Scattering  

E-Print Network [OSTI]

The high energy proton-neutron charge exchange scattering reaction is studied in an effective hadron model for the energy range of s from 45.9 to 414.61 GeV*GeV. The main features of the observed differential cross section, the forward peak and the scaling behavior over a large energy region, are well reproduced.

Y. Yan; R. Tegen; T. Gutsche; V. E. Lyubovitskij; Amand Faessler

2002-04-18T23:59:59.000Z

390

Heavy Triplets: Electric Dipole Moments vs Proton Decay  

E-Print Network [OSTI]

The experimental limit on the electron electric dipole moment constraints the pattern of supersymmetric grand-unified theories with right-handed neutrinos. We show that such contraints are already competing with the well known ones derived by the limit on proton lifetime.

Isabella Masina; Carlos A. Savoy

2003-10-30T23:59:59.000Z

391

Heavy Triplets: Electric Dipole Moments vs Proton Decay  

E-Print Network [OSTI]

The experimental limit on the electron electric dipole moment constraints the pattern of supersymmetric grand-unified theories with right-handed neutrinos. We show that such contraints are already competing with the well known ones derived by the limit on proton lifetime.

Masina, I; Masina, Isabella; Savoy, Carlos

2004-01-01T23:59:59.000Z

392

Transient accumulation of elastic energy in proton translocating ATP synthase  

E-Print Network [OSTI]

Hypothesis Transient accumulation of elastic energy in proton translocating ATP synthase Dmitry A 12 March 1999 Abstract ATP synthase is conceived as a rotatory engine with two reversible drives that the hydrolysis of three molecules of ATP in FI drives the shaft over a full circle in three steps of 120³ each

Steinhoff, Heinz-Jürgen

393

Proton Hole States of Nb,95,97,99  

E-Print Network [OSTI]

-lying proton hole states in the Nb isotopes is from the study of Ohnuma and Yntema. ' Our recent study of hole state analogs of Nb levels in the Mo iso- topes' revealed a dramatic drop in analog state strength, particularly for / =1 states as one pro...

Bindal, P. K.; Youngblood, David H.; Kozub, R. L.

1974-01-01T23:59:59.000Z

394

CW high intensity non-scaling FFAG proton drivers  

SciTech Connect (OSTI)

Accelerators are playing increasingly important roles in basic science, technology, and medicine including nuclear power, industrial irradiation, material science, and neutrino production. Proton and light-ion accelerators in particular have many research, energy and medical applications, providing one of the most effective treatments for many types of cancer. Ultra high-intensity and high-energy (GeV) proton drivers are a critical technology for accelerator-driven sub-critical reactors (ADS) and many HEP programs (Muon Collider). These high-intensity GeV-range proton drivers are particularly challenging, encountering duty cycle and space-charge limits in the synchrotron and machine size concerns in the weaker-focusing cyclotrons; a 10-20 MW proton driver is not presently considered technically achievable with conventional re-circulating accelerators. One, as-yet, unexplored re-circulating accelerator, the Fixed-field Alternating Gradient, or FFAG, is an attractive alternative to the cyclotron. Its strong focusing optics are expected to mitigate space charge effects, and a recent innovation in design has coupled stable tunes with isochronous orbits, making the FFAG capable of fixed-frequency, CW acceleration, as in the classical cyclotron. This paper reports on these new advances in FFAG accelerator technology and references advanced modeling tools for fixed-field accelerators developed for and unique to the code COSY INFINITY.

Johnstone, C.; /Fermilab; Berz, M.; Makino, K.; /Michigan State U.; Snopok, P.; /IIT, Chicago

2011-04-01T23:59:59.000Z

395

Proton Ordering of Cubic Ice Ic: Spectroscopy and Computer Simulations  

E-Print Network [OSTI]

by producing rotational Bjerrum L-defects.1 Ambient-pressure hexagonal ice, ice Ih, shows the lowest produced from ice Ih using hydroxide doping, for example, by freezing a 0.1 M KOH solution. Because ice IhProton Ordering of Cubic Ice Ic: Spectroscopy and Computer Simulations Philipp Geiger, Christoph

Dellago, Christoph

396

Spin Structure Moments of the Proton and Deuteron  

SciTech Connect (OSTI)

Moments of the spin structure functions g1 and g2 of the proton and deuteron have been measured in the resonance region at intermediate four momentum transfer. We perform a Nachtmann moment analysis of this data, along with isovector and isoscalar combinations, in order to rigorously account for target mass effects. This analysis provides the first definitive evidence for dynamic higher twists.

Slifer, Karl; Rondon-Aramayo, Oscar; Aghalaryan, Aram; Ahmidouch, Abdellah; Asaturyan, Razmik; Bloch, Frederic; Boeglin, Werner; Bosted, Peter; Carasco, Cedric; Carlini, Roger; Cha, Jinseok; Chen, Jian-Ping; Christy, Michael; Cole, Leon; Coman, Luminita; Crabb, Donald; Danagoulian, Samuel; Day, Donal; Dunne, James; Elaasar, Mostafa; Ent, Rolf; Fenker, Howard; Frlez, Emil; Gaskell, David; Gan, Liping; Gomez, Javier; Hu, Bitao; Jourdan, Juerg; Jones, Mark; Keith, Christopher; Keppel, Cynthia; Khandaker, Mahbubul; Klein, Andreas; Kramer, Laird; Liang, Yongguang; Lichtenstadt, Jechiel; Lindgren, Richard; Mack, David; McKee, Paul; McNulty, Dustin; Meekins, David; Mkrtchyan, Hamlet; Nasseripour, Rakhsha; Niculescu, Maria-Ioana; Normand, Kristoff; Norum, Blaine; Pocanic, Dinko; Prok, Yelena; Raue, Brian; Reinhold, Joerg; Roche, Julie; Rohe, Daniela; Savvinov, Nikolai; Sawatzky, Bradley; Seely, Mikell; Sick, Ingo; Smith, C.; Smith, G.; Stepanyan, Samuel; Tang, Liguang; Tajima, Shigeyuki; Testa, Giuseppe; Vulcan, William; Wang, Kebin; Warren, G.; Wesselmann, Frank; Wood, Stephen; Yan, Chen; Yuan, Lulin; Yun, Junho; Zeier, Markus; Guo Zhu, Hong

2009-01-01T23:59:59.000Z

397

Proton Irradiation Damage Assessment of Carbon Reinforced Composites  

E-Print Network [OSTI]

Proton Irradiation Damage Assessment of Carbon Reinforced Composites: 2-D & 3-D Weaved Structures carbon-carbon composite ATJ Graphite 3D CC composite AGS Beam-on-Target tests show clearly that carbon composites are better absorbers of thermo- mechanical shock. This is attributed to the very low coeff

McDonald, Kirk

398

Nuclear activation technique for analysis of laser induced energetic protons  

E-Print Network [OSTI]

. For that purpose, we have developed a method in which the particles induce nuclear reactions in a stack of copper for medical applications [6]). In addition, nuclear reaction yields and nuclear decay rates might be studied radioactive nuclei. In a stack of samples, each foil acts as a low energy proton filter for the following ones

Paris-Sud XI, Université de

399

Quasifree photoproduction of $?$ mesons off protons and neutrons  

E-Print Network [OSTI]

Differential and total cross sections for the quasifree reactions $\\gamma p\\rightarrow\\eta p$ and $\\gamma n\\rightarrow\\eta n$ have been determined at the MAMI-C electron accelerator using a liquid deuterium target. Photons were produced via bremsstrahlung from the 1.5 GeV incident electron beam and energy-tagged with the Glasgow photon tagger. Decay photons of the neutral decay modes $\\eta\\rightarrow 2\\gamma$ and $\\eta\\rightarrow 3\\pi^0 \\rightarrow 6\\gamma$ and coincident recoil nucleons were detected in a combined setup of the Crystal Ball and the TAPS calorimeters. The $\\eta$-production cross sections were measured in coincidence with recoil protons, recoil neutrons, and in an inclusive mode without a condition on recoil nucleons, which allowed a check of the internal consistency of the data. The effects from nuclear Fermi motion were removed by a kinematic reconstruction of the final-state invariant mass and possible nuclear effects on the quasifree cross section were investigated by a comparison of free and quasifree proton data. The results, which represent a significant improvement in statistical quality compared to previous measurements, agree with the known neutron-to-proton cross-section ratio in the peak of the $S_{11}(1535)$ resonance and confirm a peak in the neutron cross section, which is absent for the proton, at a center-of-mass energy $W = (1670\\pm 5)$ MeV with an intrinsic width of $\\Gamma\\approx 30$ MeV.

A2 Collaboration; D. Werthmller; L. Witthauer; I. Keshelashvili; P. Aguar-Bartolom; J. Ahrens; J. R. M. Annand; H. J. Arends; K. Bantawa; R. Beck; V. Bekrenev; A. Braghieri; D. Branford; W. J. Briscoe; J. Brudvik; S. Cherepnya; S. Costanza; B. Demissie; M. Dieterle; E. J. Downie; P. Drexler; L. V. Fil'kov; A. Fix; D. I. Glazier; D. Hamilton; E. Heid; D. Hornidge; D. Howdle; G. M. Huber; I. Jaegle; O. Jahn; T. C. Jude; A. Kser; V. L. Kashevarov; R. Kondratiev; M. Korolija; S. P. Kruglov; B. Krusche; A. Kulbardis; V. Lisin; K. Livingston; I. J. D. MacGregor; Y. Maghrbi; J. Mancell; D. M. Manley; Z. Marinides; M. Martinez; J. C. McGeorge; E. F. McNicoll; V. Metag; D. G. Middleton; A. Mushkarenkov; B. M. K. Nefkens; A. Nikolaev; R. Novotny; M. Oberle; M. Ostrick; P. B. Otte; B. Oussena; P. Pedroni; F. Pheron; A. Polonski; S. N. Prakhov; J. Robinson; G. Rosner; T. Rostomyan; S. Schumann; M. H. Sikora; D. Sober; A. Starostin; I. Supek; M. Thiel; A. Thomas; M. Unverzagt; D. P. Watts

2014-07-25T23:59:59.000Z

400

Collaborative Emissions Research at EMSL | EMSL  

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

Collaborative Emissions Research at EMSL Collaborative Emissions Research at EMSL EMSL produced this video for the annual congressional science expo organized by the National User...

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


401

Particle Number & Particulate Mass Emissions Measurements on...  

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

Number & Particulate Mass Emissions Measurements on a 'Euro VI' Heavy-duty Engine using the PMP Methodologies Particle Number & Particulate Mass Emissions Measurements on a 'Euro...

402

Measurement and Characterization of Unregulated Emissions from...  

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

More Documents & Publications Ethanol Effects on Lean-Burn and Stoichiometric GDI Emissions Measurement and Characterization of Unregulated Emissions from Advanced Technologies...

403

The supply chain of CO2 emissions  

E-Print Network [OSTI]

emissions from traded fossil fuels; Top), production (F Pr )Regional, and National Fossil-Fuel CO 2 Emissions (Carbonfrom the burning of fossil fuels are conventionally

Davis, S. J; Peters, G. P; Caldeira, K.

2011-01-01T23:59:59.000Z

404

Radionuclide Air Emission Report for 2011  

E-Print Network [OSTI]

LBNL-470E-201 Radionuclide Air Emission Report for Preparedfor Estimating Fugitive Air Emissions of Radionuclides fromStandards for Hazardous Air Pollutants (Radionuclides),

Wahl, Linnea

2012-01-01T23:59:59.000Z

405

Energy-Related Carbon Emissions in Manufacturing  

Reports and Publications (EIA)

Energy-related carbon emissions in manufacturing analysis and issues related to the energy use, energy efficiency, and carbon emission indicators.

2000-01-01T23:59:59.000Z

406

Materials Applications of Photoelectron Emission Microscopy....  

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

a variety of photoexcitation sources including synchrotron emission, femtosecond laser pulses and conventional UV lamp emission. Each source has advantages, for example, fs...

407

Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling...  

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

Spray, Combustion, & Emission Modeling using KH-ACT Primary Breakup Model & Detailed Chemistry Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling using KH-ACT Primary...

408

Particulate Emissions Control by Advanced Filtration Systems...  

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

Particulate Emissions Control by Advanced Filtration Systems or GDI Engines Particulate Emissions Control by Advanced Filtration Systems or GDI Engines 2013 DOE Hydrogen and Fuel...

409

Characterizing Test Methods and Emissions Reduction Performance...  

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

Test Methods and Emissions Reduction Performance of In-Use Diesel Retrofit Technologies from the National Clean Diesel Campaign Characterizing Test Methods and Emissions Reduction...

410

International Emissions Trading: Design and Political Acceptability.  

E-Print Network [OSTI]

??This thesis discusses the design and political acceptability of international emissions trading. It is shown that there are several designs options for emissions trading at (more)

Boom, Jan Tjeerd

2006-01-01T23:59:59.000Z

411

Demonstrating Fuel Consumption and Emissions Reductions with...  

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

Fuel Consumption and Emissions Reductions with Next Generation Model-Based Diesel Engine Control Demonstrating Fuel Consumption and Emissions Reductions with Next Generation...

412

Pion-pion cross section from proton-proton collisions at the LHC  

E-Print Network [OSTI]

The zero-degree calorimeters (ZDC) installed in the ALICE, ATLAS and CMS experiments at the LHC, make possible simultaneous detection of forward-backward leading neutrons, pp=>nXn. Such data with sufficiently high statistics could be a source of information about the pion-pion total cross section at high energies, provided that the absorption corrections, which are expected to be strong, are well understood. Otherwise, making a plausible assumption about the magnitude of the pion-pion cross section, one can consider such measurements as a way to study the absorption effects, which is the main focus of the present paper. These effects introduced at the amplitude level, are found to be different for the pion fluxes, which either conserve or flip the nucleon helicity. The pion fluxes from both colliding protons are essentially reduced by absorption, moreover, there is a common absorption suppression factor, which breaks down the factorized form of the cross section. We also evaluate the feed-down corrections related to the initial/final state inelastic processes possessing a rapidity gap, and found them to be small in the kinematic range under consideration. The contribution of other iso-vector Reggeons, spin-flip natural parity rho and a2, and spin non-flip unnatural parity a1 are also evaluated and found to be rather small.

B. Z. Kopeliovich; H. -J. Pirner; I. K. Potashnikova; K. Reygers; Ivan Schmidt

2015-02-25T23:59:59.000Z

413

Assessment of Proton Deflectometry for Exploding Wire Experiments  

SciTech Connect (OSTI)

This project provides the first demonstration of the application of proton deflectometry for the diagnosis of electromagnetic field topology and current-carrying regions in Z-pinch plasma experiments. Over the course of this project several milestones were achieved. High-energy proton beam generation was demonstrated on the short-pulse high-intensity Leopard laser, (10 Joules in ~350 femtoseconds, and the proton beam generation was shown to be reproducible. Next, protons were used to probe the electromagnetic field structure of short circuit loads in order to benchmark the two numerical codes, the resistive-magnetohydrodynamics (MHD) code, Gorgon, and the hybrid particle-in-cell code, LSP for the interpretation of results. Lastly, the proton deflectometry technique was used to map the magnetic field structure of pulsed-power-driven plasma loads including wires and supersonic jets formed with metallic foils. Good agreement between the modeling and experiments has been obtained. The demonstrated technique holds great promise to significantly improve the understanding of current flow and electromagnetic field topology in pulsed power driven high energy density plasmas. Proton probing with a high intensity laser was for the first time implemented in the presence of the harsh debris and x-ray producing z-pinch environment driven by a mega-ampere-scale pulsed-power machine. The intellectual merit of the program was that it investigated strongly driven MHD systems and the influence of magnetic field topology on plasma evolution in pulsed power driven plasmas. The experimental program involved intense field-matter interaction in the generation of the proton probe, as well as the generation of plasma subjected to 1 MegaGauss scale magnetic fields. The computational aspect included two well-documented codes, in combination for the first time to provide accurate interpretation of the experimental results. The broader impact included the support of 2 graduate students, one at UCSD and one at NTF, who were exposed to both the experimental physics work, the MHD and PIC modeling of the system. A first generation college undergraduate student was employed to assist in experiments and data analysis throughout the project. Data resulting from the research program were broadly disseminated by publication in scientific journals, and presentation at international and national conferences and workshops.

Beg, Farhat Nadeem [University of California San Diego] [University of California San Diego

2013-09-25T23:59:59.000Z

414

Design and Simulation of a Passive-Scattering Nozzle in Proton Beam Radiotherapy  

E-Print Network [OSTI]

Proton beam radiotherapy is an emerging treatment tool for cancer. Its basic principle is to use a high-energy proton beam to deposit energy in a tumor to kill the cancer cells while sparing the surrounding healthy tissues. The therapeutic proton...

Guan, Fada

2010-07-14T23:59:59.000Z

415

A Combined Molecular Dynamics and Diffusion Model of Single Proton Conduction through Gramicidin  

E-Print Network [OSTI]

A Combined Molecular Dynamics and Diffusion Model of Single Proton Conduction through Gramicidin through the gramicidin pore is described by a potential of mean force and diffusion coefficient obtained in the hydrogen bonding structure of pore waters without an excess proton. Proton entrance and exit were

Schumaker, Mark

416

Plasma diagnostics by means of the scattering of electrons and proton beams  

E-Print Network [OSTI]

Plasma diagnostics by means of the scattering of electrons and proton beams E. NARDI,1 Y. MARON,1; ACCEPTED 23 May 2007) Abstract Scattering of energetic electron and proton beams by cold matter this effect as a plasma diagnostic tool, utilizing monoenergetic, well-collimated electron or proton beams

417

Proton aurora dynamics in response to the IMF and solar wind variations  

E-Print Network [OSTI]

Proton aurora dynamics in response to the IMF and solar wind variations S.-W. Chang,1,2 S. B. Mende; accepted 24 April 2002; published 13 July 2002. [1] On May 23, 2000, proton auroras observed by IMAGE FUV wind parameters. A proton aurora brightened at high latitude poleward from the dayside oval after solar

California at Berkeley, University of

418

Persistent global proton aurora caused by high solar wind dynamic pressure  

E-Print Network [OSTI]

Persistent global proton aurora caused by high solar wind dynamic pressure K. M. Laundal1 and N] Global images of the proton aurora taken with the SI-12 camera onboard the IMAGE satellite reveal a very direct relationship between the solar wind dynamic pressure and the intensity of the global proton aurora

Bergen, Universitetet i

419

Observation of the proton aurora with IMAGE FUV imager and simultaneous ion flux in situ measurements  

E-Print Network [OSTI]

Observation of the proton aurora with IMAGE FUV imager and simultaneous ion flux in situ satellite images the aurora in three different spectral regions. One of the channels of the spectrographic to spectrally discriminate between the proton and electron FUV aurora and to globally map the energetic protons

California at Berkeley, University of

420

Fabrication of Annealed Proton-Exchanged Waveguides Vertically Integrated with Chalcogenide Waveguides  

E-Print Network [OSTI]

...................................................... 25 B.1. Soft Proton Exchange .................................................... 25 B.2. Proton Exchange in Benzoic Acid Vapor ...................... 25 B.3. Annealed Proton Exchange ........................................... 26 B... Page C.2. Anneal Depth Model ..................................................... 30 C.3. Bidimensional Hydrogen Concentration Model ............ 32 C.4. Mode Profile Simulations .............................................. 35...

Macik, Dwayne

2012-10-19T23:59:59.000Z

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


421

Proton Transport and the Water Environment in Nafion Fuel Cell Membranes and AOT Reverse Micelles  

E-Print Network [OSTI]

Proton Transport and the Water Environment in Nafion Fuel Cell Membranes and AOT Reverse Micelles D channels of Nafion fuel cell membranes at various hydration levels are compared to water in a series by its use as a proton conducting membrane in fuel cells. Nafion membranes in fuel cells allow protons

Fayer, Michael D.

422

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Rhode Island requires all entities that sell electricity in the state to disclose details regarding the fuel mix and emissions of their electric generation to end-use customers. This information...

423

Anomalous Emission from HII regions  

E-Print Network [OSTI]

Spinning dust appears to be the best explanation for the anomalous emission that has been observed at $\\sim 10-60$ GHz. One of the best examples of spinning dust comes from a HII region in the Perseus molecular cloud. Observations of other HII regions also show tentative evidence for excess emission at frequencies $\\sim 30$ GHz, although at lower emissivity levels. A new detection of excess emission at 31 GHz in the HII region RCW175 has been made. The most plausible explanation again comes from spinning dust. HII regions are a good place to look for spinning dust as long as accurate radio data spanning the $\\sim 5-100$ GHz range is available.

C. Dickinson

2008-08-04T23:59:59.000Z

424

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

In September 2002, the Minnesota Public Utilities Commission (PUC) issued an order requiring the state's regulated electric utilities to disclose to customers details on the fuel mix and emissions...

425

Mobile fiber optic emission spectrograph  

SciTech Connect (OSTI)

Technical Assistance Request HLW/DWPF-TAR-970064 asked SRTC to evaluate the use of a fiber optic coupled emission spectrometer. The spectrometer would provide additional ICP analyses in the DWPF laboratory.

Spencer, W.A.; Coleman, C.J.; McCarty, J.E.; Beck, R.S.

1997-05-01T23:59:59.000Z

426

Trading quasi-emission permits  

E-Print Network [OSTI]

I study the design of environmental policies for a regulator that has incomplete information on firms' emissions and costs of production and abatement (e.g., air pollution in cities with numerous small polluting sources). ...

Montero, Juan-Pablo

2002-01-01T23:59:59.000Z

427

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Iowa adopted regulations in 2003 that generally require rate-regulated electric utilities to disclose to customers the fuel mix and estimated emissions, in pounds per megawatt-hour (MWh), of...

428

The Value of Emissions Trading  

E-Print Network [OSTI]

This paper estimates the value of international emissions trading, focusing attention on a here-to-fore neglected component: its value as a hedge against uncertainty. Much analysis has been done of the Kyoto Protocol and ...

Webster, Mort David.

429

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Michigan's Customer Choice and Electric Reliability Act of 2000 (P.A. 141) requires electric suppliers to disclose to customers details related to the fuel mix and emissions, in pounds per megawatt...

430

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

In 2001, Nevada enacted legislation requiring the states electric utilities to provide details regarding the fuel mix and emissions of electric generation to their customers. Utilities must...

431

Integrating proton coupled electron transfer (PCET) and excited states  

SciTech Connect (OSTI)

In many of the chemical steps in photosynthesis and artificial photosynthesis, proton coupled electron transfer (PCET) plays an essential role. An important issue is how excited state reactivity can be integrated with PCET to carry out solar fuel reactions such as water splitting into hydrogen and oxygen or water reduction of CO{sub 2} to methanol or hydrocarbons. The principles behind PCET and concerted electronproton transfer (EPT) pathways are reasonably well understood. In Photosystem II antenna light absorption is followed by sensitization of chlorophyll P{sub 680} and electron transfer quenching to give P{sub 680}{sup +}. The oxidized chlorophyll activates the oxygen evolving complex (OEC), a CaMn4 cluster, through an intervening tyrosinehistidine pair, Y{sub Z}. EPT plays a major role in a series of four activation steps that ultimately result in loss of 4e{sup ?}/4H{sup +} from the OEC with oxygen evolution. The key elements in photosynthesis and artificial photosynthesis light absorption, excited state energy and electron transfer, electron transfer activation of multiple-electron, multiple-proton catalysis can also be assembled in dye sensitized photoelectrochemical synthesis cells (DS-PEC). In this approach, molecular or nanoscale assemblies are incorporated at separate electrodes for coupled, light driven oxidation and reduction. Separate excited state electron transfer followed by proton transfer can be combined in single semi-concerted steps (photo-EPT) by photolysis of organic charge transfer excited states with H-bonded bases or in metal-to-ligand charge transfer (MLCT) excited states in pre-associated assemblies with H-bonded electron transfer donors or acceptors. In these assemblies, photochemically induced electron and proton transfer occur in a single, semi-concerted event to give high-energy, redox active intermediates.

Gagliardi, Christopher J.; Westlake, Brittany C.; Kent, Caleb A.; Paul, Jared J.; Papanikolas, John M.; Meyer, Thomas J.

2010-01-01T23:59:59.000Z

432

Supine proton beam craniospinal radiotherapy using a novel tabletop adapter  

SciTech Connect (OSTI)

To develop a device that allows supine craniospinal proton and photon therapy to the vast majority of proton and photon facilities currently experiencing limitations as a result of couch design issues. Plywood and carbon fiber were used for the development of a prototype unit. Once this was found to be satisfactory after all design issues were addressed, computer-assisted design (CAD) was used and carbon fiber tables were built to our specifications at a local manufacturer of military and racing car carbon fiber parts. Clinic-driven design was done using real-time team discussion for a prototype design. A local machinist was able to construct a prototype unit for us in <2 weeks after the start of our project. Once the prototype had been used successfully for several months and all development issues were addressed, a custom carbon fiber design was developed in coordination with a carbon fiber manufacturer in partnership. CAD methods were used to design the units to allow oblique fields from head to thigh on patients up to 200 cm in height. Two custom-designed carbon fiber craniospinal tabletop designs now exist: one long and one short. Four are in successful use in our facility. Their weight tolerance is greater than that of our robot table joint (164 kg). The long unit allows for working with taller patients and can be converted into a short unit as needed. An affordable, practical means of doing supine craniospinal therapy with protons or photons can be used in most locations via the use of these devices. This is important because proton therapy provides a much lower integral dose than all other therapy methods for these patients and the supine position is easier for patients to tolerate and for anesthesia delivery. These units have been successfully used for adult and pediatric supine craniospinal therapy, proton therapy using oblique beams to the low pelvis, treatment of various spine tumors, and breast-sparing Hodgkin's therapy.

Buchsbaum, Jeffrey C., E-mail: jbuchsba@iupui.edu [IU Health Proton Therapy Center, Bloomington, IN (United States); Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN (United States); Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN (United States); Department of Neurological Surgery, Indiana University School of Medicine, Indianapolis, IN (United States); Besemer, Abby; Simmons, Joseph; Hoene, Ted; Simoneaux, Victor; Sandefur, Amy [IU Health Proton Therapy Center, Bloomington, IN (United States); Wolanski, Mark; Li, Zhao; Cheng, Chee-Wei [IU Health Proton Therapy Center, Bloomington, IN (United States); Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, IN (United States)

2013-04-01T23:59:59.000Z

433

Incident-Energy Dependent Quenching of the Analyzing Power in Pre-Equilibrium Composite Particle Emission  

SciTech Connect (OSTI)

The proton-induced pre-equilibrium process in the energy range of 100 to 160 MeV, which leads to emission of composite ejectiles such as {sup 3}He and {alpha}-particles, is discussed. New cross section and analyzing power measurements for the (p,{sup 3}He) reaction on {sup 93}Nb at an incident energy of 160 MeV are presented, and these are found to be in agreement with the prediction of a statistical multistep theoretical formulation. The observed quenching of the analyzing power is also reproduced well by the theory. The results are consistent with earlier work at lower incident energies and other nuclear species.

Cowley, A. A. [Physics Department, Stellenbosch University, Private Bag X1, Matieland 7602 (South Africa); iThemba LABS, PO Box 722, Somerset West 7129 (South Africa); Dimitrova, S. S. [Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784 Sofia (Bulgaria); Zyl, J. J. van [Physics Department, Stellenbosch University, Private Bag X1, Matieland 7602 (South Africa)

2011-10-28T23:59:59.000Z

434

Search for Supersymmetry Using Weak Boson Fusion Processes in Proton-Proton Collisions at the Large Hadron Collider  

E-Print Network [OSTI]

In 2012, the Large Hadron Collider at CERN (LHC) collided protons at an unprecedented center-of-mass energy of 8 TeV. With data corresponding to a total integrated luminosity of 19.7 fb^(?1), the Compact Muon Solenoid (CMS) collaboration is studying...

Flanagan, Will

2014-08-08T23:59:59.000Z

435

Rapidity and centrality dependence of proton and anti-proton production from 197Au+197Au collisions at {radical}(s{sub NN}) = 130 GeV  

SciTech Connect (OSTI)

We report on the rapidity and centrality dependence of proton and anti-proton transverse mass distributions from {sup 197}Au + {sup 197}Au collisions at {radical}s{sub NN} = 130 GeV as measured by the STAR experiment at RHIC. Our results are from the rapidity and transverse momentum range of |y| < 0.5 and 0.35 < p{sub t} < 1.00 GeV/c. For both protons and anti-protons, transverse mass distributions become more convex from peripheral to central collisions demonstrating characteristics of collective expansion. The measured rapidity distributions and the mean transverse momenta versus rapidity are flat within |y| < 0.5. Comparisons of our data with results from model calculations indicate that in order to obtain a consistent picture of the proton(anti-proton) yields and transverse mass distributions the possibility of pre-hadronic collective expansion may have to be taken into account.

Adams, J.; Adler, C.; Aggarwal, M.M.; Ahammed, Z.; Amonett, J.; Anderson, B.D.; Anderson, M.; Arkhipkin, D.; Averichev, G.S.; Badyal, S.K.; Balewski, J.; Barannikova, O.; Barnby, L.S.; Baudot, J.; Bekele, S.; Belaga, V.V.; Bellwied, R.; Berger, J.; Bezverkhny, B.I.; Bhardwaj, S.; Bhaskar, P.; Bhati, A.K.; Bichsel, H.; Billmeier, A.; Bland, L.C.; Blyth, C.O.; Bonner, B.E.; Botje, M.; Boucham, A.; Brandin, A.; Bravar, A.; Cadman, R.V.; Cai, X.Z.; Caines, H.; Calderon de la Barca Sanchez, M.; Cardenas, A.; Carroll, J.; Castillo, J.; Castro, M.; Cebra, D.; Chaloupka, P.; Chattopadhyay, S.; Chen, H.F.; Chen, Y.; Chernenko, S.P.; Cherney, M.; Chikanian, A.; Choi, B.; Christie, W.; Coffin, J.P.; Cormier, T.M.; Corral, M.M.; Cramer, J.G.; Crawford, H.J.; Das, D.; Das, S.; Derevschikov, A.A.; Didenko, L.; Dietel, T.; Dong, X.; Draper, J.E.; Du, F.; Dubey, A.K.; Dunin, V.B.; Dunlop, J.C.; Dutta Mazumdar, M.R.; Eckardt, V.; Efimov, L.G.; Emelianov, V.; Engelage, J.; Eppley, G.; Erazmus, B.; Fachini, P.; Faine, V.; Faivre, J.; Fatemi, R.; Filimonov, K.; Filip, P.; Finch, E.; Fisyak, Y.; Flierl, D.; Foley, K.J.; Fu, J.; Gagliardi, C.A.; Ganti, M.S.; Gutierrez, T.D.; Gagunashvili, N.; Gans, J.; Gaudichet, L.; Germain, M.; Geurts, F.; Ghazikhanian, V.; Ghosh, P.; Gonzalez, J.E.; Grachov, O.; Grigoriev, V.; Grosnick, D.; Guedon, M.; Guertin, S.M.; Gupta, A.; Gushin, E.; Hallman, T.J.; Hardtke, D.; Harris, J.W.; Heinz, M.; Henry, T.W.; Heppelmann, S.; Herston, T.; Hippolyte, B.; Hirsch, A.; Hjort, E.; Hoffmann, G.W.; Horsley, M.; Huang, H.Z.; Huang, S.L.; Humanic, T.J.; Igo, G.; Ishihara, A.; Jacobs, P.; Jacobs, W.W.; Janik, M.; Johnson, I.; Jones, P.G.; Judd, E.G.; Kabana, S.; Kaneta, M.; Kaplan, M.; Keane, D.; Kiryluk, J.; Kisiel, A.; Klay, J.; Klein, S.R.; Klyachko, A.; Koetke, D.D.; Kollegger, T.; Konstantinov, A.S.; Kopytine, M.; Kotchenda, L.; Kovalenko, A.D.; Kramer, M.; Kravtsov, P.; Krueger, K.; Kuhn, C.; Kulikov, A.I.; Kumar, A.; et al.

2003-06-20T23:59:59.000Z

436

Developing the Galactic Diffuse Emission Model for the GLAST Large Area Telescope  

SciTech Connect (OSTI)

Diffuse emission is produced in energetic cosmic ray (CR) interactions, mainly protons and electrons, with the interstellar gas and radiation field and contains the information about particle spectra in distant regions of the Galaxy. It may also contain information about exotic processes such as dark matter annihilation, black hole evaporation etc. A model of the diffuse emission is important for determination of the source positions and spectra. Calculation of the Galactic diffuse continuum g-ray emission requires a model for CR propagation as the first step. Such a model is based on theory of particle transport in the interstellar medium as well as on many kinds of data provided by different experiments in Astrophysics and Particle and Nuclear Physics. Such data include: secondary particle and isotopic production cross sections, total interaction nuclear cross sections and lifetimes of radioactive species, gas mass calibrations and gas distribution in the Galaxy (H{sub 2}, H I, H II), interstellar radiation field, CR source distribution and particle spectra at the sources, magnetic field, energy losses, g-ray and synchrotron production mechanisms, and many other issues. We are continuously improving the GALPROP model and the code to keep up with a flow of new data. Improvement in any field may affect the Galactic diffuse continuum g-ray emission model used as a background model by the GLAST LAT instrument. Here we report about the latest improvements of the GALPROP and the diffuse emission model.

Moskalenko, Igor V.; Strong, Andrew W.; Digel, Seth W.; Porter, Troy A.

2007-04-30T23:59:59.000Z

437

arXiv:0910.1428v1[hep-ex]8Oct2009 Longitudinal Spin Transfer to and Hyperons in Polarized Proton-Proton  

E-Print Network [OSTI]

-Proton Collisions at s = 200 GeV B. I. Abelev,8 M. M. Aggarwal,30 Z. Ahammed,47 A. V. Alakhverdyants,17 B. D

Llope, William J.

438

Energy enhancement of proton acceleration in combinational radiation pressure and bubble by optimizing plasma density  

SciTech Connect (OSTI)

The combinational laser radiation pressure and plasma bubble fields to accelerate protons are researched through theoretical analysis and numerical simulations. The dephasing length of the accelerated protons bunch in the front of the bubble and the density gradient effect of background plasma on the accelerating phase are analyzed in detail theoretically. The radiation damping effect on the accelerated protons energy is also considered. And it is demonstrated by two-dimensional particle-in-cell simulations that the protons bunch energy can be increased by using the background plasma with negative density gradient. However, radiation damping makes the maximal energy of the accelerated protons a little reduction.

Bake, Muhammad Ali; Xie Baisong [Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education, Beijing Normal University, Beijing 100875 (China); College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 (China); Shan Zhang [Department of Mathematics and Physics, Shijiazhuang Tiedao University, Shijiazhuang 050043 (China); Hong Xueren [College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 (China); College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070 (China); Wang Hongyu [Department of Physics, Anshan Normal University, Anshan 114005 (China); Shanghai Bright-Tech Information Technology Co. Ltd, Shanghai 200136 (China)

2012-08-15T23:59:59.000Z

439

7, 68436902, 2007 An Asian emission  

E-Print Network [OSTI]

ACPD 7, 6843­6902, 2007 An Asian emission inventory for the period 1980­2020 T. Ohara et al. Title Chemistry and Physics Discussions An Asian emission inventory of anthropogenic emission sources 7, 6843­6902, 2007 An Asian emission inventory for the period 1980­2020 T. Ohara et al. Title Page

Paris-Sud XI, Université de

440

Atmospheric Mercury: Emissions, Transport/Fate,  

E-Print Network [OSTI]

, global...) Is "emissions trading" workable and ethical? Is the recently promulgated Clean Air Mercury

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


441

Emissions Trading: A Feasible Analysis for UBC  

E-Print Network [OSTI]

Emissions Trading: A Feasible Analysis for UBC Vivian Hoffman, J Chisholm I. Introduction The GVRD environmental objectives are achieved. Emissions reduction credit trading (or emissions trading) is an example Valley (LFV). Section III describes the market-based instruments of emissions trading and facility

442

Spectroscopy of 26F to Probe Proton-Neutron Forces Close to the Drip Line  

SciTech Connect (OSTI)

A long-lived J 4 1 isomer, T1=2 2:2 1 ms, has been discovered at 643.4(1) keV in the weakly bound 26 9 F nucleus. It was populated at Grand Acce le rateur National d Ions Lourds in the fragmentation of a 36S beam. It decays by an internal transition to the J 1 1 ground state [82(14)%], by decay to 26Ne, or -delayed neutron emission to 25Ne. From the -decay studies of the J 1 1 and J 4 1 states, new excited states have been discovered in 25;26Ne. Gathering the measured binding energies of the J 1 1 4 1 multiplet in 26 9 F, we find that the proton-neutron 0d5=20d3=2 effective force used in shell-model calculations should be reduced to properly account for the weak binding of 26 9 F. Microscopic coupled cluster theory calculations using interactions derived from chiral effective field theory are in very good agreement with the energy of the low-lying 1 1 , 2 1 , 4 1 states in 26F. Including three-body forces and coupling to the continuum effects improve the agreement between experiment and theory as compared to the use of two-body forces only.

Hagen, Gaute [ORNL; Sorlin, O. [Grand Accelerateur National d'Ions Lourds (GANIL); Borcea, C. [IFIN, Bucharest-Magurele, Romania; Brown, B. A. [Michigan State University, East Lansing; Grevy, S. [Grand Accelerateur National d'Ions Lourds (GANIL); Grinyer, G. F. [Michigan State University, East Lansing; Hjorth-Jensen, Morten [ORNL; Jansen, G. R. [UTK/ORNL; Negoita, F. [IFIN, Bucharest-Magurele, Romania; Thomas, J.-C. [CEN Bordeaux-Gradignan/CNRS, France

2013-01-01T23:59:59.000Z

443

Rationale for and Preliminary Results of Proton Beam Therapy for Mediastinal Lymphoma  

SciTech Connect (OSTI)

Purpose: To evaluate the potential of three-dimensional proton beam therapy (3D-PBT) for reducing doses to normal structures in patients with mediastinal lymphomas compared with conventional photon radiation therapy (RT). Methods and Materials: We treated 10 consecutive patients with mediastinal masses from lymphomas with 3D-PBT between July 2007 and February 2009 to 30.6-50.4 cobalt-Gray equivalents (CGE). Of those patients, 7 had primary refractory or recurrent disease, and 8 had Hodgkin lymphoma. Dosimetric endpoints were compared with those from conventional RT plans. Results: PBT delivered lower mean doses to the lung (6.2 vs. 9.5 Gy), esophagus (9.5 vs. 22.3 Gy), and heart (8.8 vs. 17.7 Gy) but not the breasts (5.9 vs. 6.1 Gy) than did conventional RT. Percentages of lung, esophagus, heart, and coronary artery (particularly the left anterior descending artery) volumes receiving radiation were consistently lower in the 3D-PBT plans over a wide range of radiation doses. Of the 7 patients who had residual disease on positron emission tomography before PBT, 6 (86%) showed a complete metabolic response. Conclusions: In patients with mediastinal lymphomas, 3D-PBT produced significantly lower doses to the lung, esophagus, heart, and coronary arteries than did the current conventional RT. These lower doses would be expected to reduce the risk of late toxicities in these major organs.

Li Jing; Dabaja, Bouthaina; Reed, Valerie; Allen, Pamela K.; Cai, Haihong; Amin, Mayankkumar V.; Garcia, John A. [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas (United States); Cox, James D., E-mail: jcox@mdanderson.org [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas (United States)

2011-09-01T23:59:59.000Z

444

Advanced Emissions Control Development Program  

SciTech Connect (OSTI)

Babcock & Wilcox (B&W) is conducting a five-year project aimed at the development of practical, cost-effective strategies for reducing the emissions of hazardous air pollutants (commonly called air toxics) from coal-fired electric utility plants. The need for air toxic emissions controls may arise as the U. S. Environmental Protection Agency proceeds with implementation of Title III of the Clean Air Act Amendment (CAAA) of 1990. Data generated during the program will provide utilities with the technical and economic information necessary to reliably evaluate various air toxics emissions compliance options such as fuel switching, coal cleaning, and flue gas treatment. The development work is being carried out using B&W?s new Clean Environment Development Facility (CEDF) wherein air toxics emissions control strategies can be developed under controlled conditions, and with proven predictability to commercial systems. Tests conducted in the CEDF provide high quality, repeatable, comparable data over a wide range of coal properties, operating conditions, and emissions control systems. Development work to date has concentrated on the capture of mercury, other trace metals, fine particulate, and the inorganic species hydrogen chloride and hydrogen fluoride.

A. P. Evans

1998-12-03T23:59:59.000Z

445

Advanced Emission Control Development Program.  

SciTech Connect (OSTI)

Babcock & Wilcox (B&W) is conducting a five-year project aimed at the development of practical, cost-effective strategies for reducing the emissions of hazardous air pollutants (commonly called air toxics) from coal-fired electric utility plants. The need for air toxic emissions controls may arise as the U. S. Environmental Protection Agency proceeds with implementation of Title III of the Clean Air Act Amendment (CAAA) of 1990. Data generated during the program will provide utilities with the technical and economic information necessary to reliably evaluate various air toxics emissions compliance options such as fuel switching, coal cleaning, and flue gas treatment. The development work is being carried out using B&W`s new Clean Environment Development Facility (CEDF) wherein air toxics emissions control strategies can be developed under controlled conditions, and with proven predictability to commercial systems. Tests conducted in the CEDF provide high quality, repeatable, comparable data over a wide range of coal properties, operating conditions, and emissions control systems. Development work to date has concentrated on the capture of mercury, other trace metals, fine particulate, and the inorganic species hydrogen chloride and hydrogen fluoride.

Evans, A.P.

1997-12-31T23:59:59.000Z

446

Advanced Emissions Control Development Program  

SciTech Connect (OSTI)

McDermott Technology, Inc. (MTI) is conducting a five-year project aimed at the development of practical, cost-effective strategies for reducing the emissions of hazardous air pollutants (commonly called air toxics) from coal-fired electric utility plants. The need for air toxic emissions controls may arise as the U. S. Environmental Protection Agency proceeds with implementation of Title III of the Clean Air Act Amendment (CAAA) of 1990. Data generated during the program will provide utilities with the technical and economic information necessary to reliably evaluate various air toxics emissions compliance options such as fuel switching, coal cleaning, and flue gas treatment. The development work is being carried out using the Clean Environment Development Facility (CEDF) wherein air toxics emissions control strategies can be developed under controlled conditions, and with proven predictability to commercial systems. Tests conducted in the CEDF provide high quality, repeatable, comparable data over a wide range of coal properties, operating conditions, and emissions control systems. Development work to date has concentrated on the capture of mercury, other trace metals, fine particulate, and the inorganic species, hydrogen chloride and hydrogen fluoride.

A. P. Evans

1998-12-03T23:59:59.000Z

447

Advanced Emissions Control Development Program  

SciTech Connect (OSTI)

McDermott Technology, Inc. (MTI) is conducting a five-year project aimed at the development of practical, cost-effective strategies for reducing the emissions of hazardous air pollutants (commonly called air toxics) from coal-fired electric utility plants. The need for air toxic emissions controls may arise as the U. S. Environmental Protection Agency proceeds with implementation of Title III of the Clean Air Act Amendment (CAAA) of 1990. Data generated during the program will provide utilities with the technical and economic information necessary to reliably evaluate various air toxics emissions compliance options such as fuel switching, coal cleaning, and flue gas treatment. The development work is being carried out using the Clean Environment Development Facility (CEDF) wherein air toxics emissions control strategies can be developed under controlled conditions, and with proven predictability to commercial systems. Tests conducted in the CEDF provide high quality, repeatable, comparable data over a wide range of coal properties, operating conditions, and emissions control systems. Development work to date has concentrated on the capture of mercury, other trace metals, fine particulate, and hydrogen chloride and hydrogen fluoride.

M. J. Holmes

1998-12-03T23:59:59.000Z

448

MeV-GeV emission from neutron-loaded short gamma-ray burst jets  

E-Print Network [OSTI]

Recent discovery of the afterglow emission from short gamma-ray bursts suggests that binary neutron star or black hole-neutron star binary mergers are the likely progenitors of these short bursts. The accretion of neutron star material and its subsequent ejection by the central engine implies a neutron-rich outflow. We consider here a neutron-rich relativistic jet model of short bursts, and investigate the high energy neutrino and photon emission as neutrons and protons decouple from each other. We find that upcoming neutrino telescopes are unlikley to detect the 50 GeV neutrinos expected in this model. For bursts at z~0.1, we find that GLAST and ground-based Cherenkov telescopes should be able to detect prompt 100 MeV and 100 GeV photon signatures, respectively, which may help test the neutron star merger progenitor identification.

Soebur Razzaque; Peter Meszaros

2006-06-28T23:59:59.000Z

449

Materials for use as proton conducting membranes for fuel cells  

DOE Patents [OSTI]

A family of polymers having pendent sulfonate moieties connected to polymeric main chain phenyl groups are described. These polymers are prepared by the steps of polymerization (using a monomer with a phenyl with an alkoxy substitution), deportation by converting the alkoxy to a hydroxyl, and functionalization of the polymer with a pendant sulfonate group. As an example, sulfonated poly(arylene ether sulfone) copolymers with pendent sulfonic acid groups are synthesized by the direct copolymerization of methoxy-containing poly(arylene ether sulfone)s, then converting the methoxy groups to the reactive hydroxyl form, and finally functionalizing the hydroxyl form with proton-conducting sites through nucleophilic substitution. The family of polymers may have application in proton exchange membranes and in other applications.

Einsla, Brian R. (Blacksburg, VA); McGrath, James E. (Blacksburg, VA)

2009-01-06T23:59:59.000Z

450

Net-proton probability distribution in heavy ion collisions  

E-Print Network [OSTI]

We compute net-proton probability distributions in heavy ion collisions within the hadron resonance gas model. The model results are compared with data taken by the STAR Collaboration in Au-Au collisions at sqrt(s_{NN})= 200 GeV for different centralities. We show that in peripheral Au-Au collisions the measured distributions, and the resulting first four moments of net-proton fluctuations, are consistent with results obtained from the hadron resonance gas model. However, data taken in central Au-Au collisions differ from the predictions of the model. The observed deviations can not be attributed to uncertainties in model parameters. We discuss possible interpretations of the observed deviations.

P. Braun-Munzinger; B. Friman; F. Karsch; K. Redlich; V. Skokov

2011-07-21T23:59:59.000Z

451

Design study of a medical proton linac for neutron therapy  

SciTech Connect (OSTI)

This paper describes a design study which establishes the physical parameters of the low energy beam transport, radiofrequency quadrupole, and linac, using computer programs available at Fermilab. Beam dynamics studies verify that the desired beam parameters can be achieved. The machine described here meets the aforementioned requirements and can be built using existing technology. Also discussed are other technically feasible options which could be attractive to clinicians, though they would complicate the design of the machine and increase construction costs. One of these options would allow the machine to deliver 2.3 MeV protons to produce epithermal neutrons for treating brain tumors. A second option would provide 15 MeV protons for isotope production. 21 refs., 33 figs.

Machida, S.; Raparia, D.

1988-08-26T23:59:59.000Z

452

Proton radiography of a shock-compressed target  

SciTech Connect (OSTI)

In this paper we report on the radiography of a shock-compressed target using laser produced proton beams. A low-density carbon foam target was shock compressed by long pulse high-energy laser beams. The shock front was transversally probed with a proton beam produced in the interaction of a high intensity laser beam with a gold foil. We show that from radiography data, the density profile in the shocked target can be deduced using Monte Carlo simulations. By changing the delay between long and short pulse beams, we could probe different plasma conditions and structures, demonstrating that the details of the steep density gradient can be resolved. This technique is validated as a diagnostic for the investigation of warm dense plasmas, allowing an in situ characterization of high-density contrasted plasmas.

Ravasio, A.; Benuzzi-Mounaix, A.; Loupias, B.; Ozaki, N.; Vinci, T.; Koenig, M. [Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605, CNRS-CEA-Universite Paris VI-Ecole Polytechnique, 91128 Palaiseau Cedex (France); Romagnani, L.; Cecchetti, C.; Borghesi, M. [School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 INN (United Kingdom); Le Pape, S.; Hicks, D.; MacKinnon, A.; Park, H. S.; Patel, P. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Batani, D.; Dezulian, R. [Dipartimento di Fisica G. Occhialini, Universita di Milano-Bicocca, Piazza Della Scienze 3, 20126 Milano (Italy); Boehly, T. [Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States); Gremillet, L.; Henry, E. [CEA, DAM, DIF, F-91297 Arpajon Cedex (France); Schiavi, A. [Department of Energetics, University of Rome 'La Sapienza' Rome (Italy)

2010-07-15T23:59:59.000Z

453

Linac-Based Proton Driver for a Neutrino Factory  

E-Print Network [OSTI]

A Neutrino Factory Proton Driver based on a superconducting proton linac has been designed in the CERN context. The 5 GeV/4 MW H- beam from the linac is accumulated using charge exchange injection in a fixed-energy synchrotron and afterwards transferred to a compressor ring, where bunch rotation takes place. The lattices of the accumulator and compressor are described, as well as magnet technology and RF manipulations. Critical issues related to charge-exchange injection, space-charge effects in the compressor and beam stability in the accumulator, are addressed. The analysis is focused on the baseline scenario, which provides 6 bunches on the target. Results of preliminary analysis of options with less bunches (three and one) are also presented.

Garoby, R; Aiba, M; Meddahi, M

2009-01-01T23:59:59.000Z

454

Production of sodium-22 from proton irradiated aluminum  

DOE Patents [OSTI]

A process for selective separation of sodium-22 from a proton irradiated minum target including dissolving a proton irradiated aluminum target in hydrochloric acid to form a first solution including aluminum ions and sodium ions, separating a portion of the aluminum ions from the first solution by crystallization of an aluminum salt, contacting the remaining first solution with an anion exchange resin whereby ions selected from the group consisting of iron and copper are selectively absorbed by the anion exchange resin while aluminum ions and sodium ions remain in solution, contacting the solution with an cation exchange resin whereby aluminum ions and sodium ions are adsorbed by the cation exchange resin, and, contacting the cation exchange resin with an acid solution capable of selectively separating the adsorbed sodium ions from the cation exchange resin while aluminum ions remain adsorbed on the cation exchange resin is disclosed.

Taylor, Wayne A. (Los Alamos, NM); Heaton, Richard C. (Los Alamos, NM); Jamriska, David J. (Los Alamos, NM)

1996-01-01T23:59:59.000Z

455

First fusion proton measurements in TEXTOR plasmas using activation technique  

SciTech Connect (OSTI)

MeV particle loss measurements from fusion plasmas, in particular alpha particles, remain difficult in large fusion devices and further R and D is needed for ITER. This paper describes the first attempt to measure 3 MeV escaping fusion protons emitted from TEXTOR tokamak plasmas using activation technique. This technique was successfully demonstrated, initially, in 2006 on the JET tokamak. An ion camera equipped with a collimator and several types of activation detectors was installed inside the TEXTOR vacuum vessel to perform these measurements. After irradiation, the detectors were analyzed using ultra low level gamma-ray spectrometry at the HADES underground laboratory. 3 MeV escaping fusion protons were detected in larger number -{approx}6 times more - compared to earlier measurements using this technique on JET. Another major progress was the reduction of the cooling time by a factor of 50, which made possible to detect radionuclides with half-life of less than 90 min.

Bonheure, G.; Wassenhove, G. Van [ERM-KMS, Trilateral Euregio Cluster, B-1000 Brussels (Belgium); Mlynar, J. [Association Euratom-IPP.CR, Institute of Plasma Physics AS CR, v.v.i., Za Slovankou 3, CZ-182 00 Praha 8 (Czech Republic); Hult, M.; Gonzalez de Orduna, R.; Lutter, G. [Institute for Reference Materials and Measurements (IRMM), Retieseweg 111, B-2440 Geel (Belgium); Vermaercke, P. [SCK-CEN, Boeretang, B-2400 Mol (Belgium); Huber, A.; Schweer, B.; Esser, G.; Biel, W. [Forschungszentrum Juelich GmbH, Institut fuer Plasmaphysik, EURATOM-Assoziation, Trilateral Euregio Cluster, D-52425 Juelich (Germany)

2012-10-15T23:59:59.000Z

456

Ratio of Pion Kaon Production in Proton Carbon Interactions  

SciTech Connect (OSTI)

The ratio of pion-kaon production by 120 GeV/c protons incident on carbon target is presented. The data was recorded with the Main Injector Particle Production experiment at Fermi National Accelerator Laboratory. Production ratios of K{sup +}/{pi}{sup +}, K{sup -}/{pi}{sup -}, K{sup -}/K{sup +}, and {pi}{sup -}/{pi}{sup +} are measured in 24 bins in longitudinal momentum from 20 to 90 GeV/c and transverse momentum up to 2 GeV/c. The measurement is compared to existing data sets, particle production Monte Carlo results from FLUKA-06, parametrization of proton-beryllium data at 400/450 GeV/c, and ratios measured by the MINOS experiment on the NuMI target.

Lebedev, Andrey V.; /Harvard U.

2007-05-01T23:59:59.000Z

457

Nuclear spin response studies in inelastic polarized proton scattering  

SciTech Connect (OSTI)

Spin-flip probabilities S/sub nn/ have been measured for inelastic proton scattering at incident proton energies around 300 MeV from a number of nuclei. At low excitation energies S/sub nn/ is below the free value. For excitation energies above about 30 MeV for momentum transfers between about 0.35 fm/sup /minus/1/ and 0.65 fm/sup / minus/1/ S/sub nn/ exceeds free values significantly. These results suggest that the relative ..delta..S = 1(..delta..S = 0 + ..delta..S = 1) nuclear spin response approaches about 90% in the region of the enhancement. Comparison of the data with slab response calculations are presented. Decomposition of the measured cross sections into sigma(..delta..S = 0) and sigma(..delta..S = 1) permit extraction of nonspin-flip and spin-flip dipole and quadrupole strengths. 29 refs., 11 figs.

Jones, K.W.

1988-01-01T23:59:59.000Z

458

Spin Exchange Rates in Proton-Hydrogen Collisions  

E-Print Network [OSTI]

The spin temperature of neutral hydrogen, which determines the optical depth and brightness of the 21 cm line, is determined by the competition between radiative and collisional processes. Here we examine the role of proton-hydrogen collisions in setting the spin temperature. We use recent fully quantum mechanical calculations of the relevant cross sections, which allow us to present accurate results over the entire physically relevant temperature range 1-10,000 K. For kinetic temperatures T_K>100 K, the proton-hydrogen rate coefficient exceeds that for hydrogen-hydrogen collisions by about a factor of two. However, at low temperatures (T_K < 5 K) H-p collisions become several thousand times more efficient than H-H and even more important than H-e^- collisions.

Steven Furlanetto; Michael Furlanetto

2007-02-22T23:59:59.000Z

459

Air Emission Inventory for the Idaho National Engineering and Environmental Laboratory - Calendar Year 1999 Emission Report  

SciTech Connect (OSTI)

This report presents the 1999 calendar year update of the Air Emission Inventory for the Idaho National Engineering and Environmental Laboratory (INEEL). The INEEL Air Emission Inventory documents sources and emissions of nonradionuclide pollutants from operations at the INEEL. The report describes the emission inventory process and all of the sources at the INEEL, and provides nonradionuclide emissions estimates for stationary sources.

Zohner, S.K.

2000-05-30T23:59:59.000Z

460

Air Emission Inventory for the Idaho National Engineering and Environmental Laboratory - Calendar Year 1998 Emissions Report  

SciTech Connect (OSTI)

This report presents the 1998 calendar year update of the Air Emission Inventory for the Idaho National Engineering and Environmental Laboratory (INEEL). The INEEL Air Emission Inventory documents sources and emissions of nonradionuclide pollutants from operations at the INEEL. The report describes the emission inventory process and all of the sources at the INEEL, and provides nonradiological emissions estimates for stationary sources.

S. K. Zohner

1999-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Air emission inventory for the Idaho National Engineering Laboratory: 1994 emissions report  

SciTech Connect (OSTI)

This report Presents the 1994 update of the Air Emission inventory for the Idaho National Engineering Laboratory (INEL). The INEL Air Emission Inventory documents sources and emissions of non-radionuclide pollutants from operations at the INEL. The report describes the emission inventory process and all of the sources at the INEL, and provides non-radionuclide emissions estimates for stationary sources.

NONE

1995-07-01T23:59:59.000Z

462

Half-lives and delayed neutron emission probabilities of neutron-rich Li--Al nuclides (US)  

SciTech Connect (OSTI)

Beta-decay half-lives and delayed neutron emission probabilities of very neutron-rich nuclides from Li to Al have been measured by a delayed coincidence technique. Neutron-rich nuclides were produced by reaction of 800-MeV protons on a {sup 232}Th target and were individually identified by use of the time-of-flight isochronous spectrometer. For 16 previously measured nucides, the half-lives determined here agree with literature values within the uncertainties. The previously unmeasured half-lives for {sup 25}F (59{plus minus}40 ms) and {sup 28}Ne (14{plus minus}10 ms) have been determined. Delayed neutron emission has been measured for {sup 12}Be, {sup 14}B, {sup 17}C, {sup 18}N, {sup 25}F, and {sup 28}Ne. Emission probabilities are reported for 19 precursors and upper limits are reported for 12 other nuclides. These data are compared with predictions of several beta-decay models.

Reeder, P.L.; Warner, R.A.; Hensley, W.K. (Pacific Northwest Laboratory, Richland, Washington (USA)); Vieira, D.J.; Wouters, J.M. (Los Alamos National Laboratory, Los Alamos, New Mexico (USA))

1991-10-01T23:59:59.000Z

463

New formula for proton-neutron mass difference  

SciTech Connect (OSTI)

A new formula is presented, allowing the computation of the proton-neutron mass difference without the knowledge of the subtraction function in the dispersion integral. The Born terms contribute with the correct sign. The integral over the deep-inelastic region is finite whenever the Weinberg--'t Hooft mechanism is operative, and gives a small value. The net result is in very good agreement with the experimental value.

Kimel, I.

1983-05-01T23:59:59.000Z

464

Diffraction: a different window on QCD and the proton structure  

E-Print Network [OSTI]

) M. Arneodo University of Eastern Piedmont, Novara, INFN Torino, Italy Wine & Cheese Seminar particles emerge intact or dissociated into low-mass states. Energy beam energy (within a few %) o by struck quark Q2/W2 W = photon-proton centre of mass energy y = W2/s F2=i[ei 2 x fi(x,Q2)] R=L/T DIS

465

Polarization effects in elastic proton-electron scattering  

SciTech Connect (OSTI)

The experimental observables for the elastic reaction induced by protons scattering from electrons are calculated in the Born approximation. The differential cross section and polarization observables have been derived assuming one-photon exchange. Numerical estimates are given for spin correlation coefficients, polarization transfer coefficients, and depolarization coefficients in a wide kinematical range. Specific attention is given to the kinematical conditions; that is, to the specific range of incident energy and transferred momentum.

Gakh, G. I. [National Science Centre 'Kharkov Institute of Physics and Technology,' 61108 Akademicheskaya 1, Kharkov (Ukraine); Dbeyssi, A.; Marchand, D.; Tomasi-Gustafsson, E. [CNRS/IN2P3, Institut de Physique Nucleaire, UMR 8608, F-91405 Orsay (France); Bytev, V. V. [Joint Institute for Nuclear Research, Dubna (Russian Federation)

2011-07-15T23:59:59.000Z

466

Advanced proton-exchange materials for energy efficient fuel cells.  

SciTech Connect (OSTI)

The ''Advanced Proton-Exchange Materials for Energy Efficient Fuel Cells'' Laboratory Directed Research and Development (LDRD) project began in October 2002 and ended in September 2005. This LDRD was funded by the Energy Efficiency and Renewable Energy strategic business unit. The purpose of this LDRD was to initiate the fundamental research necessary for the development of a novel proton-exchange membranes (PEM) to overcome the material and performance limitations of the ''state of the art'' Nafion that is used in both hydrogen and methanol fuel cells. An atomistic modeling effort was added to this LDRD in order to establish a frame work between predicted morphology and observed PEM morphology in order to relate it to fuel cell performance. Significant progress was made in the area of PEM material design, development, and demonstration during this LDRD. A fundamental understanding involving the role of the structure of the PEM material as a function of sulfonic acid content, polymer topology, chemical composition, molecular weight, and electrode electrolyte ink development was demonstrated during this LDRD. PEM materials based upon random and block polyimides, polybenzimidazoles, and polyphenylenes were created and evaluated for improvements in proton conductivity, reduced swelling, reduced O{sub 2} and H{sub 2} permeability, and increased thermal stability. Results from this work reveal that the family of polyphenylenes potentially solves several technical challenges associated with obtaining a high temperature PEM membrane. Fuel cell relevant properties such as high proton conductivity (>120 mS/cm), good thermal stability, and mechanical robustness were demonstrated during this LDRD. This report summarizes the technical accomplishments and results of this LDRD.

Fujimoto, Cy H.; Grest, Gary Stephen; Hickner, Michael A.; Cornelius, Christopher James; Staiger, Chad Lynn; Hibbs, Michael R.

2005-12-01T23:59:59.000Z

467

Cosmic-ray induced gamma-ray emission from the starburst galaxy NGC 253  

SciTech Connect (OSTI)

Cosmic rays in galaxies interact with the interstellar medium and give us a direct view of nuclear and particle interactions in the cosmos. For example, cosmic-ray proton interactions with interstellar hydrogen produce gamma rays via PcrPism??{sup 0}???. For a 'normal' star-forming galaxy like the Milky Way, most cosmic rays escape the Galaxy before such collisions, but in starburst galaxies with dense gas and huge star formation rate, most cosmic rays do suffer these interactions [1,2]. We construct a 'thick-target' model for starburst galaxies, in which cosmic rays are accelerated by supernovae, and escape is neglected. This model gives an upper limit to the gamma-ray emission. Only two free parameters are involved in the model: cosmic-ray proton acceleration energy rate from supernova and the proton injection spectral index. The pionic gamma-radiation is calculated from 10 MeV to 10 TeV for the starburst galaxy NGC 253, and compared to Fermi and HESS data. Our model fits NGC 253 well, suggesting that cosmic rays in this starburst are in the thick target limit, and that this galaxy is a gamma-ray calorimeter.

Wang, Xilu; Fields, Brian D. [Department of Astronomy, MC-221, 1002 W. Green Street, University of Illinois at Urbana-Champaign, Urbana, IL 61801 (United States)

2014-05-09T23:59:59.000Z

468

Linac4 45 keV Proton Beam Measurements  

E-Print Network [OSTI]

Linac4 is a 160 MeV normal-conducting H- linear accelerator, which will replace the 50 MeV proton Linac2 as injector for the CERN proton complex. Commissioning of the low energy part - comprising the H - source, a 45 keV Low Energy Beam Transport line (LEBT), a 3 MeV Radiofrequency Quadrupole (RFQ) and a Medium Energy Beam Transport (MEBT) - will start in fall 2012 on a dedicated test stand installation. In preparation to this, preliminary measurements were taken using a 45 keV proton source and a temporary LEBT setup, with the aim of characterising the output beam by comparison with the predictions of simulations. At the same time this allowed a first verification of the functionalities of diagnostics instrumentation and acquisition software tools. Measurements of beam profile, emittance and intensity were taken in three different setups: right after the source, after the first and after the second LEBT solenoids respectively. Particle distributions were reconstructed from emittance scan...

Bellodi, G; Hein, L M; Lallement, J-B; Lombardi, A M; Midttun, O; Scrivens, R; Posocco, P A

2013-01-01T23:59:59.000Z

469

Examining exotic structure of proton-rich nucleus $^{23}$Al  

E-Print Network [OSTI]

The longitudinal momentum distribution (P_{//}) of fragments after one-proton removal from ^{23} Al and reaction cross sections (\\sigma_R) for ^{23,24} Al on carbon target at 74A MeV have been measured. The ^{23,24} Al ions were produced through projectile fragmentation of 135 A MeV ^{28} Si primary beam using RIPS fragment separator at RIKEN. P_{//} is measured by a direct time-of-flight (TOF) technique, while \\sigma_R is determined using a transmission method. An enhancement in \\sigma_R is observed for ^{23} Al compared with ^{24} Al. The P_{//} for ^{22} Mg fragments from ^{23} Al breakup has been obtained for the first time. FWHM of the distributions has been determined to be 232 \\pm 28 MeV/c. The experimental data are discussed by using Few-Body Glauber model. Analysis of P_{//} demonstrates a dominant d-wave configuration for the valence proton in ground state of ^{23} Al, indicating that ^{23} Al is not a proton halo nucleus.

D. Q. Fang; W. Guo; C. W. Ma; K. Wang; T. Z. Yan; Y. G. Ma; X. Z. Cai; W. Q. Shen; Z. Z. Ren; Z. Y. Sun; J. G. Chen; W. D. Tian; C. Zhong; M. Hosoi; T. Izumikawa; R. Kanungo; S. Nakajima; T. Ohnishi; T. Ohtsubo; A. Ozawa; T. Suda; K. Sugawara; T. Suzuki; A. Takisawa; K. Tanaka; T. Yamaguchi; I. Tanihata

2007-09-07T23:59:59.000Z

470

Propagation of UHE Protons through Magnetized Cosmic Web  

E-Print Network [OSTI]

If ultra-high-energy cosmic rays (UHECRs) originate from extragalactic sources, understanding the propagation of charged particles through the magnetized large scale structure (LSS) of the universe is crucial in the search for the astrophysical accelerators. Based on a novel model of the turbulence dynamo, we estimate the intergalactic magnetic fields (IGMFs) in cosmological simulations of the formation of the LSS. Under the premise that the sources of UHECRs are strongly associated with the LSS, we consider a model in which protons with E >10^{19} eV are injected by sources that represent active galactic nuclei located inside clusters of galaxies. With the model IGMFs, we then follow the trajectories of the protons, while taking into account the energy losses due to interactions with the cosmic background radiation. For observers located inside groups of galaxies like ours, about 70% and 35% of UHECR events above 60 EeV arrive within ~15 degree and ~5 degree, respectively, of the source position with time delays of less than ~10^7 yr. This implies that the arrival direction of super-GZK protons might exhibit a correlation with the distribution of cosmological sources on the sky. In this model, nearby sources (within 10 - 20 Mpc) should contribute significantly to the particle flux above ~10^{20} eV.

Santabrata Das; Hyesung Kang; Dongsu Ryu; Jungyeon Cho

2008-05-16T23:59:59.000Z

471

Locomotive emission study. Final report  

SciTech Connect (OSTI)

The work for the report involved the estimation of the air pollution emissions arising from the operation of railroad locomotives in six non-attainment air management basins within California. The six air basins are the Bay Area, the Central Coast (which includes the North Central Coast and the South Central Coast basins), the South Coast, San Diego, San Joaquin, and the Sacramento Valley basins. In addition, the effort involved the development of information about the efficacy and cost of feasible control strategies for locomotive-generated air pollution emissions, for both long and short term implementation.

NONE

1991-01-01T23:59:59.000Z

472

Femtoscopy and energy-momentum conservation effects in proton-proton collisions at 900 GeV in ALICE  

E-Print Network [OSTI]

Two particle correlations are used to extract information about the characteristic size of the system for proton-proton collisions at 900 GeV measured by the ALICE (A Large Ion Collider experiment) detector at CERN. The correlation functions obtained show the expected Bose-Einstein effect for identical particles, but there are also long range correlations present that shift the baseline from the expected flat behavior. A possible source of these correlations is the conservation of energy and momentum, especially for small systems, where the energy available for particle production is limited. A new technique, first introduced by the STAR collaboration, of quantifying these long range correlations using energy-momentum conservation considerations is presented here. It is shown that the baseline of the two particle correlation function can be described using this technique.

Nicolas Bock

2010-09-16T23:59:59.000Z

473

Angular Dependence in Proton-Proton Correlation Functions in Central $^{40}Ca+^{40}Ca$ and $^{48}Ca+^{48}Ca$ Reactions  

E-Print Network [OSTI]

The angular dependence of proton-proton correlation functions is studied in central $^{40}Ca+^{40}Ca$ and $^{48}Ca+^{48}Ca$ nuclear reactions at E=80 MeV/A. Measurements were performed with the HiRA detector complemented by the 4$\\pi$ Array at NSCL. A striking angular dependence in the laboratory frame is found within p-p correlation functions for both systems that greatly exceeds the measured and expected isospin dependent difference between the neutron-rich and neutron-deficient systems. Sources measured at backward angles reflect the participant zone of the reaction, while much larger sources observed at forward angles reflect the expanding, fragmenting and evaporating projectile remnants. The decrease of the size of the source with increasing momentum is observed at backward angles while a weaker trend in the opposite direction is observed at forward angles. The results are compared to the theoretical calculations using the BUU transport model.

V. Henzl; M. A. Kilburn; Z. Chajecki; D. Henzlova; W. G. Lynch; D. Brown; A. Chbihi; D. Coupland; P. Danielewicz; R. deSouza; M. Famiano; C. Herlitzius; S. Hudan; Jenny Lee; S. Lukyanov; A. M. Rogers; A. Sanetullaev; L. Sobotka; Z. Y. Sun; M. B. Tsang; A. Vander Molen; G. Verde; M. Wallace; M. Youngs

2011-08-12T23:59:59.000Z

474

Angular Dependence in Proton-Proton Correlation Functions in Central $^{40}Ca+^{40}Ca$ and $^{48}Ca+^{48}Ca$ Reactions  

E-Print Network [OSTI]

The angular dependence of proton-proton correlation functions is studied in central $^{40}Ca+^{40}Ca$ and $^{48}Ca+^{48}Ca$ nuclear reactions at E=80 MeV/A. Measurements were performed with the HiRA detector complemented by the 4$\\pi$ Array at NSCL. A striking angular dependence in the laboratory frame is found within p-p correlation functions for both systems that greatly exceeds the measured and expected isospin dependent difference between the neutron-rich and neutron-deficient systems. Sources measured at backward angles reflect the participant zone of the reaction, while much larger sources observed at forward angles reflect the expanding, fragmenting and evaporating projectile remnants. The decrease of the size of the source with increasing momentum is observed at backward angles while a weaker trend in the opposite direction is observed at forward angles. The results are compared to the theoretical calculations using the BUU transport model.

Henzl, V; Chajecki, Z; Henzlova, D; Lynch, W G; Brown, D; Chbihi, A; Coupland, D; Danielewicz, P; deSouza, R; Famiano, M; Herlitzius, C; Hudan, S; Lee, Jenny; Lukyanov, S; Rogers, A M; Sanetullaev, A; Sobotka, L; Sun, Z Y; Tsang, M B; Molen, A Vander; Verde, G; Wallace, M; Youngs, M

2012-01-01T23:59:59.000Z

475

Study of double parton scattering using W + 2-jet events in proton-proton collisions at ?s = 7 TeV  

E-Print Network [OSTI]

Double parton scattering is investigated in proton-proton collisions at ?s = 7 TeV where the final state includes a W boson, which decays into a muon and a neutrino, and two jets. The data sample corresponds to an integrated ...

Apyan, Aram

476

Measurement of Top Quark Polarization in Top-Antitop Events from Proton-Proton Collisions at ?s = 7 TeV Using the ATLAS Detector  

E-Print Network [OSTI]

This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7??fb[superscript ?1] of proton-proton collision data recorded with the ATLAS detector at the Large Hadron ...

Taylor, Frank E.

477

Search for new phenomena in photon+jet events collected in protonproton collisions at ?s = 8 TeV with the ATLAS detector  

E-Print Network [OSTI]

This Letter describes a model-independent search for the production of new resonances in photon + jet (?+jet) events using 20 fb[superscript ?1] of protonproton LHC data recorded with the ATLAS detector at a centre-of-mass ...

Taylor, Frank E.

478

Search for s-channel single top-quark production in protonproton collisions at ?s = 8 TeV with the ATLAS detector  

E-Print Network [OSTI]

This Letter presents a search at the LHC for s-channel single top-quark production in protonproton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds ...

Taylor, Frank E.

479

Particle-number fluctuations and neutron-proton pairing effects on proton and neutron radii of even-even N Almost-Equal-To Z nuclei  

SciTech Connect (OSTI)

The particle-number fluctuation effect on the root-mean-square (rms) proton and neutron radii of even-even N Almost-Equal-To Z nuclei is studied in the isovector neutron-proton (np) pairing case using an exact particle-number projection method and the Woods-Saxon model.

Douici, M.; Allal, N. H.; Fellah, M.; Benhamouda, N.; Oudih, M. R. [Laboratoire de Physique Theorique, Faculte de Physique, USTHB BP 32 El-Alia, 16111 Bab-Ezzouar, Alger (Algeria) and Institut des Sciences et Technologie, Centre Universitaire de Khemis Miliana, Route de Theniet-El-Had, 44225 Khemis-Milia (Algeria); Laboratoire de Physique Theorique, Faculte de Physique, USTHB BP 32 El-Alia, 16111 Bab-Ezzouar, Alger (Algeria) and Centre de Recherche Nucleaire d'Alger, COMENA, BP399 Alger-Gare, Alger (Algeria); Laboratoire de Physique Theorique, Faculte de Physique, USTHB BP 32 El-Alia, 16111 Bab-Ezzouar, Alger (Algeria)

2012-10-20T23:59:59.000Z

480

Search for New Particles in Two-Jet Final States in 7 TeV Proton-Proton Collisions with the ATLAS Detector at the LHC  

E-Print Network [OSTI]

A search for new heavy particles manifested as resonances in two-jet final states is presented. The data were produced in 7 TeV proton-proton collisions by the LHC and correspond to an integrated luminosity of 315??nb[superscript ...

Taylor, Frank E.

Note: This page contains sample records for the topic "milliseconds proton emission" 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

Physics at an upgraded proton driver at Fermilab  

SciTech Connect (OSTI)

The accelerator-based particle physics program in the US is entering a period of transition. This is particularly true at Fermilab which for more than two decades has been the home of the Tevatron Proton-Antiproton Collider, the World's highest energy hadron collider. In a few years time the energy frontier will move to the LHC at CERN. Hence, if an accelerator-based program is to survive at Fermilab, it must evolve. Fermilab is fortunate in that, in addition to hosting the Tevatron Collider, the laboratory also hosts the US accelerator-based neutrino program. The recent discovery that neutrino flavors oscillate has opened a new exciting world for us to explore, and has created an opportunity for the Fermilab accelerator complex to continue to address the cutting-edge questions of particle physics beyond the Tevatron Collider era. The presently foreseen neutrino oscillation experiments at Fermilab (MiniBooNE [1] and MINOS [2]) will enable the laboratory to begin contributing to the Global oscillation physics program in the near future, and will help us better understand the basic parameters describing the oscillations. However, this is only a first step. To be able to pin down all of the oscillation parameters, and hopefully make new discoveries along the way, we will need high statistics experiments, which will require a very intense neutrino beam, and one or more very massive detectors. In particular we will require new MW-scale primary proton beams and perhaps ultimately a Neutrino Factory [3]. Plans to upgrade the Fermilab Proton Driver are presently being developed [4]. The upgrade project would replace the Fermilab Booster with a new 8 GeV accelerator with 0.5-2 MW beam power, a factor of 15-60 more than the current Booster. It would also make the modifications needed to the Fermilab Main Injector (MI) to upgrade it to simultaneously provide 120 GeV beams of 2 MW. This would enable a factor of 5-10 increase in neutrino beam intensities at the MI, while also supporting a vigorous 8 GeV fixed-target program. In addition, a Proton Driver might also serve as a stepping-stone to future accelerators, both as an R&D test bed and as an injector, with connections to the Linear Collider, Neutrino Factories, and a VLHC. Hence, although neutrino physics would provide the main thrust for the science program at an upgraded Fermilab proton source, the new facility would also offer exciting opportunities for other fixed-target particle physics (kaons, muons, neutrons, antiprotons, etc.) and a path towards new accelerators in the future.

Steve Geer

2004-07-28T23:59:59.000Z

482

Measurement of parity nonconservation in the proton-proton total cross section at 800 MeV  

SciTech Connect (OSTI)

A report is made of a measurement of parity nonconservation in the transmission of 800-MeV longitudinally polarized protons through an unpolarized, 1-m liquid-hydrogen target. The dependence of transmission on beam properties was studied to measure and to correct for systematic errors. The measured longitudinal asymmetry in the total cross section is A/sub L/ = (+2.4 +- 1.1 (statistical) +- 0.1 (systematic)) x 10/sup -7/. 25 refs., 2 figs.

Bowman, J.D.

1986-01-01T23:59:59.000Z

483

Charmonium production in proton-proton collisions and in collisions of lead nuclei at CERN and comparison with Brookhaven data  

SciTech Connect (OSTI)

A review of experimental data on charmoniumproduction that were obtained in fixed-target experiments at the SPS synchrotron and in proton-proton collisions and in collisions of lead nuclei in beams of the Large Hadron Collider (LHC) at CERN (Switzerland) is presented. A comparison with data obtained at the Brookhaven National Laboratory (USA) from experiments at the Relativistic Heavy Ion Collider (RHIC) is performed. Measurement of the suppression of J/{psi}-meson production as a possible signal of the production of quark-gluon plasmawas proposed back in 1986 by T. Matsui and H. Satz. An anomalous suppression of J/{psi}-meson production was discovered by the NA50 Collaboration at SPS (CERN) in central collisions of lead nuclei at the c.m. collision energy of 158 GeV per nucleon. Data obtained at the c.m. energy of 200 GeV per nucleon in the PHENIX experiment at RHIC indicate that, depending on multiplicity, the suppression of J/{psi}-meson production at this energy approximately corresponds to the suppression of J/{psi}-meson production in collisions of lead nuclei at the SPS accelerator. Theoretical models that take into account the regeneration of J/{psi} mesons describe better RHIC experimental data. The measurement of charmonium production in proton-proton collisions and in collisions of lead nuclei in LHC beams revealed the importance of taking into account the regeneration process. At the LHC energies, it is also necessary to take into account the contribution of B-meson decays. Future measurements of charmonium production at the LHC to a higher statistical precision and over an extended energy region would be of importance for obtaining deeper insight into the mechanism of charmonium production and for studying the properties of matter at high energy density and temperature.

Topilskaya, N. S., E-mail: topilska@inr.ru [Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation)

2013-10-15T23:59:59.000Z

484

Emission of polycyclic aromatic hydrocarbons in China  

SciTech Connect (OSTI)

Emission of 16 polycyclic aromatic hydrocarbons (PAHs) listed as U.S. Environmental Protection Agency (U.S. EPA) priority pollutants from major sources in China were compiled. Geographical distribution and temporal change of the PAH emission, as well as emission profiles, are discussed. It was estimated that the total PAH emission in China was 25,300 tons in 2003. The emission profile featured a relatively higher portion of high molecular weight (HMW) species with carcinogenic potential due to large contributions of domestic coal and coking industry. Among various sources, biomass burning, domestic coal combustion, and the coking industry contributed 60%, 20%, and 16% of the total emission, respectively. Total emission, emission density, emission intensity, and emission per capita showed geographical variations. In general, the southeastern provinces were characterized by higher emission density, while those in western and northern China featured higher emission intensity and population-normalized emission. Although energy consumption in China went up continuously during the past two decades, annual emission of PAHs fluctuated depending on the amount of domestic coal consumption, coke production, and the efficiency of energy utilization. 47 refs., 6 figs.

Shanshan Xu; Wenxin Liu; Shu Tao [Peking University, Beijing (China). Laboratory for Earth Surface Processes, College of Environmental Sciences

2006-02-01T23:59:59.000Z

485

A compact proton spectrometer for measurement of the absolute DD proton spectrum from which yield and ?R are determined in thin-shell inertial-confinement-fusion implosions  

SciTech Connect (OSTI)

A compact, step range filter proton spectrometer has been developed for the measurement of the absolute DD proton spectrum, from which yield and areal density (?R) are inferred for deuterium-filled thin-shell inertial confinement fusion implosions. This spectrometer, which is based on tantalum step-range filters, is sensitive to protons in the energy range 1-9 MeV and can be used to measure proton spectra at mean energies of ?1-3 MeV. It has been developed and implemented using a linear accelerator and applied to experiments at the OMEGA laser facility and the National Ignition Facility (NIF). Modeling of the proton slowing in the filters is necessary to construct the spectrum, and the yield and energy uncertainties are <10% in yield and 120?keV, respectively. This spectrometer can be used for in situ calibration of DD-neutron yield diagnostics at the NIF.

Rosenberg, M. J., E-mail: mrosenbe@mit.edu; Zylstra, A. B.; Frenje, J. A.; Rinderknecht, H. G.; Gatu Johnson, M.; Waugh, C. J.; Sguin, F. H.; Sio, H.; Sinenian, N.; Li, C. K.; Petrasso, R. D. [Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Glebov, V. Yu.; Hohenberger, M.; Stoeckl, C.; Sangster, T. C. [Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States); Yeamans, C. B.; LePape, S.; Mackinnon, A. J.; Bionta, R. M.; Talison, B. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); and others

2014-10-15T23:59:59.000Z

486

Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC  

SciTech Connect (OSTI)

A multivariate likelihood method to measure electroweak couplings with the Drell-Yan process at the LHC is presented. The process is described by the dilepton rapidity, invariant mass, and decay angle distributions. The decay angle ambiguity due to the unknown assignment of the scattered constituent quark and antiquark to the two protons in a collision is resolved statistically using correlations between the observables. The method is applied to a sample of dimuon events from proton-proton collisions at sqrt(s) = 7 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 1.1 inverse femtobarns. From the dominant u-ubar, d-dbar to gamma*/Z to opposite sign dimuons process, the effective weak mixing angle parameter is measured to be sin^2(theta[eff]) = 0.2287 +/- 0.0020 (stat.) +/- 0.0025 (syst.). This result is consistent with measurements from other processes, as expected within the standard model.

Chatrchyan, S. [Yerevan Physics Institute (Armenia); et al.,

2011-12-01T23:59:59.000Z

487

Enhanced Power Stability for Proton Conducting Solid Oxides Fuel Cells  

SciTech Connect (OSTI)

In order to provide the basis for a rational approach to improving the performance of Y-doped BaZrO{sub 3} electrolytes for proton conducting ceramic fuel cells, we carried out a series of coupled computational and experimental studies to arrive at a consensus view of the characteristics affecting the proton conductivity of these systems. The computational part of the project developed a practical first principles approach to predicting the proton mobility as a function of temperature and doping for polycrystalline systems. This is a significant breakthrough representing the first time that first principles methods have been used to study diffusion across grain boundaries in such systems. The basis for this breakthrough was the development of the ReaxFF reactive force field that accurately describes the structure and energetics of Y-doped BaZrO{sub 3} as the proton hops from site to site. The ReaxFF parameters are all derived from an extensive set of quantum mechanics calculations on various clusters, two dimensionally infinite slabs, and three dimensionally infinite periodic systems for combinations of metals, metal alloys, metal oxides, pure and Y-doped BaZrO{sub 3}, including chemical reaction pathways and proton transport pathways, structures. The ReaxFF force field enables molecular dynamics simulations to be carried out quickly for systems with {approx} 10,000 atoms rather than the {approx}100 or so practical for QM. The first 2.5 years were spent on developing and validating the ReaxFF and we have only had an opportunity to apply these methods to only a few test cases. However these simulations lead to transport properties (diffusion coefficients and activation energy) for multi-granular systems in good agreement with current experimental results. Now that we have validated the ReaxFF for diffusion across grain boundaries, we are in the position of being able to use computation to explore strategies to improve the diffusion of protons across grain boundaries, which both theory and experiment agree is the cause of the low conductivity of multi-granular systems. Our plan for a future project is to use the theory to optimize the additives and processing conditions and following this with experiment on the most promising systems. The experimental part of this project focused on improving the synthetic techniques for controlling the grain size and making measurements on the properties of these systems as a function of doping of impurities and of process conditions. A significant attention was paid to screening potential cathode materials (transition metal perovskites) and anode electrocatalysts (metals) for reactivity with Y-doped BaZrO{sub 3}, fabrication compatibility, and chemical stability in fuel cell environment. A robust method for fabricating crack-free thin membranes, as well as methods for sealing anode and cathode chambers, have been successfully developed. Our Pt|BYZ|Pt fuel cell, with a 100 {micro}m thick Y-doped BaZrO{sub 3} electrolyte layer, demonstrates the peak power density and short circuit current density of 28 mW/cm{sup 2} and 130mA/cm{sup 2}, respectively. These are the highest values of this type of fuel cell. All of these provide the basis for a future project in which theory and computation are combined to develop modified ceramic electrolytes capable of both high proton conductivity and excellent mechanical and chemical stability.

Boris Merinov; William A. Goddard III; Sossina Haile; Adri van Duin; Peter Babilo; Sang Soo Han

2005-12-29T23:59:59.000Z

488

Fiber optics spectrochemical emission sensors  

DOE Patents [OSTI]

A method is described of in situ monitoring of a body of a fluid stored in a tank or groundwater or vadose zone gases in a well for the presence of selected chemical species. The method uses a probe insertable into the well or tank via a cable and having an electrical apparatus for exciting selected chemical species in the body of fluid. The probe can have a pair of electrodes for initiating a spark or a plasma cell for maintaining a plasma to excite the selected chemical species. The probe also has an optical apparatus for receiving optical emissions emitted by the excited species and optically transmitting the emissions via the cable to an analysis location outside the well. The analysis includes detecting a selected wavelength in the emissions indicative of the presence of the selected chemical species. A plurality of probes can be suspended at an end of a respective cable, with the transmitting and analyzing steps for each probe being synchronized sequentially for one set of support equipment and instrumentation to monitor at multiple test points. The optical apparatus is arranged about the light guide axis so that the selected chemical species are excited in the fluid in alignment with the light guide axis. Optical emissions are received from the excited chemical species along such axis. 18 figs.

Griffin, J.W.; Olsen, K.B.

1992-02-04T23:59:59.000Z

489

Gas Emissions FLOODING THE LAND,  

E-Print Network [OSTI]

signif- icant sources of emissions of the greenhouse gases carbon dioxide and, in particular, methane to bacteria breaking down organic matter in the water. Methane, a much more powerful greenhouse gas than coal plants generating the same amounts of power. Dams and their associated reservoirs are globally

Batiste, Oriol

490

Continuum Radio Emission and Diagnostics  

E-Print Network [OSTI]

and inversely proportional to the square of frequency and to temperature to the power 1.5. It is therefore discusses incoher­ ent emission from thermal plasma in the non­flaring so­ lar atmosphere; other relevant. The opacity of this mecha­ nism is proportional to the product of the electron and ion charge densities

White, Stephen

491

Educational Multiwavelength Atomic Emission Spectrometer  

E-Print Network [OSTI]

atomic absorption is the capability for simultaneous multielement analysis. It can be used colleges had acquired atomic absorption instruments by the year 1990.[2] In contrast, atomic emission with the acetylene-air flame source taken from an existing atomic absorption instrument. Two spectrometer units

Nazarenko, Alexander

492

HYPERPARAMETER ESTIMATION FOR EMISSION COMPUTED  

E-Print Network [OSTI]

HYPERPARAMETER ESTIMATION FOR EMISSION COMPUTED TOMOGRAPHY DATA A. López (a) , R. Molina (b) (a limited due to several factors. These factors include the need of greater computational time than to the projection data to obtain two-dimensional slices or cross sections (images) of activity distribution. #12

Granada, Universidad de

493

Predicting Reactor Antineutrino Emissions Using New Precision Beta Spectroscopy  

SciTech Connect (OSTI)

Neutrino experiments at nuclear reactors are currently vital to the study of neutrino oscillations. The observed antineutrino rates at reactors are typically lower than model expectations. This observed deficit is called the reactor neutrino anomaly. A new understanding of neutrino physics may be required to explain this deficit, though model estimation uncertainties may also play a role in the apparent discrepancy. PNNL is currently investigating an experimental technique that promises reduced uncertainties for measured data to support these hypotheses and interpret reactor antineutrino measurements. The experimental approach is to 1) direct a proton accelerator beam on a metal target to produce a source of neutrons, 2) use spectral tailoring to modify the neutron spectrum to closely simulate the energy distribution of a power reactor neutron spectrum, 3) irradiate isotopic fission foils (235U, 238U, 239Pu, 241Pu) in this neutron spectrum so that fissions occur at energies representative of a reactor, 4) transport the beta particles released by the fission products in the foils to a beta spectrometer, 5) measure the beta energy spectrum, and 6) invert the measured beta energy spectrum to an antineutrino energy spectrum. A similar technique using a beta spectrometer and isotopic fission foils was pioneered in the 1980s at the ILL thermal reactor. Those measurements have been the basis for interpreting all subsequent antineutrino measurements at reactors. A basic constraint in efforts to reduce uncertainties in predicting the antineutrino emission from reactor cores is any underlying limitation of the original measurements. This may include beta spectrum energy resolution, the absolute normalization of beta emission to number of fission, statistical counting uncertainties, lack of 238U data, the purely thermal nature of the IIL reactor neutrons used, etc. An accelerator-based neutron source that can be tailored to match various reactor neutron spectra provides an advantage for control in studying how changes in the neutron spectra (i.e. "in the reactor core") affects the resulting fission product beta spectrum. Furthermore, the 238U antineutrino spectrum, which has not been measured, can be studied directly because of the enhanced 1 MeV fast neutron flux available at the accelerator source. A facility such as the Project X Injector Experiment (PXIE) 30 MeV proton linear accelerator at Fermilab is being considered for this experiment. The hypothesis is that a new approach utilizing the flexibility of an accelerator neutron source with spectral tailoring coupled with a careful design of an isotopic fission target and beta spectrometer and the inversion of the beta spectrum to the neutrino spectrum will allow further reduction in the uncertainties associated with prediction of the reactor antineutrino spectrum.

Asner, David M.; Burns, Kimberly A.; Greenfield, Bryce A.; Kos, Marek S.; Orrell, John L.; Schram, Malachi; VanDevender, Brent A.; Wootan, David W.

2013-05-01T23:59:59.000Z

494

Copper K-shell emission cross sections for lasersolid experiments  

SciTech Connect (OSTI)

Published measurements and models of the cross section for electrons causing K-shell emission from copper are reviewed to find a suitable expression to use when analyzing K{sub ?}-emission measurements in lasersolid experiments at peak intensities above 10{sup 18} W/cm{sup 2}. Few measurements exist in the 0.1- to 10-MeV electron energy range currently of interest, leaving a number of possible suitable models that are summarized here with a number of typing errors corrected. Two different limiting forms for the cross section at relativistic energies are used, and existing measurements do not give a clear indication as to which is correct. Comparison with the limiting form of electron stopping power indicates an alternative relativistic form and also that the density-effect correction will be important in copper above 10 MeV. For data analysis relying on relative K{sub ?} emission caused by electrons with energy much greater than the K-shell binding energy, the existing uncertainty in cross sections is unimportant, but it will be a source of uncertainty when using absolute values and for electron energies up to ?6 the binding energy. K-shell emission caused by photons and protons is also briefly reviewed.

Davies, J. R.; Betti, R.; Nilson, P. M.; Solodov, A. A. [Fusion Science Center for Extreme States of Matter, Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)] [Fusion Science Center for Extreme States of Matter, Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)

2013-08-15T23:59:59.000Z

495

On the origin of \\gamma-ray emission in \\eta\\ Carina  

E-Print Network [OSTI]

\\eta\\ Car is the only colliding-wind binary for which high-energy \\gamma\\ rays are detected. Although the physical conditions in the shock region change on timescales of hours to days, the variability seen at GeV energies is weak and on significantly longer timescales. The \\gamma-ray spectrum exhibits two features that can be interpreted as emission from the shocks on either side of the contact discontinuity. Here we report on the first time-dependent modelling of the non-thermal emission in \\eta\\ Car. We find that emission from primary electrons is likely not responsible for the \\gamma-ray emission, but accelerated protons interacting with the dense wind material can explain the observations. In our model, efficient acceleration is required at both shocks, with the primary side acting as a hadron calorimeter, whilst on the companion side acceleration is limited by the flow time out of the system, resulting in changing acceleration conditions. The system therefore represents a unique laboratory for the explor...

Ohm, S; Hinton, J A; Parkin, E R

2015-01-01T23:59:59.000Z

496

Evidence for an anomalous quantum state of protons in nanoconfined water  

SciTech Connect (OSTI)

Deep inelastic neutron scattering provides a means of directly and accurately measuring the momentum distribution of protons in water, which is determined primarily by the proton ground-state wave function.We find that in water confined on scales of 20 A, this wave function responds to the details of the confinement, corresponds to a strongly anharmonic local potential, shows evidence in some cases of coherent delocalization in double wells, and involves changes in zero-point kinetic energy of the protons from 40 to +120 meV difference from that of bulk water at room temperature. This behavior appears to be a generic feature of nanoscale confinement. It is exhibited here in 16 A inner diameter carbon nanotubes, two different hydrated proton exchange membranes (PEMs), Nafion 1120 and Dow 858, and has been seen earlier in xerogel and 14 A diameter carbon nanotubes. The proton conductivity in the PEM samples correlates with the degree of coherent delocalization of the proton.

Reiter, George F [ORNL; Kolesnikov, Alexander I [ORNL; Paddison, Stephen J [ORNL; Platzman, P. M. [480 Addison Road, Short Hills, New Jersey, 07078, USA; Moravsky, Alexander P. [5MER Corporation, Tucson, Arizona; Adams, Mark A. [ISIS Facility, Rutherford Appleton Laboratory; Mayers, Dr. Jerry [ISIS Facility, Rutherford Appleton Laboratory

2012-01-01T23:59:59.000Z

497

Laser-seeded modulation instability in a proton driver plasma wakefield accelerator  

SciTech Connect (OSTI)

A new method for initiating the modulation instability (MI) of a proton beam in a proton driver plasma wakefield accelerator using a short laser pulse preceding the beam is presented. A diffracting laser pulse is used to produce a plasma wave that provides a seeding modulation of the proton bunch with the period equal to that of the plasma wave. Using the envelope description of the proton beam, this method of seeding the MI is analytically compared with the earlier suggested seeding technique that involves an abrupt truncation of the proton bunch. The full kinetic simulation of a realistic proton bunch is used to validate the analytic results. It is further used to demonstrate that a plasma density ramp placed in the early stages of the laser-seeded MI leads to its stabilization, resulting in sustained accelerating electric fields (of order several hundred MV/m) over long propagation distances (?1001000 m)

Siemon, Carl; Khudik, Vladimir; Austin Yi, S.; Shvets, Gennady [Department of Physics and Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States)] [Department of Physics and Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States); Pukhov, Alexander [Institut fr Theoretische Physik I, Universitt Dsseldorf, Dsseldorf 40225 (Germany)] [Institut fr Theoretische Physik I, Universitt Dsseldorf, Dsseldorf 40225 (Germany)

2013-10-15T23:59:59.000Z