Sample records for amerada hess hess

  1. 38017,"AMERADA HESS CORP ",1,130,"MOTOR...

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

    017,"AMERADA HESS CORP ",1,130,"MOTOR GAS, CONVENTIONAL, OTHER",1803,"JACKSONVILLE, FL","FLORIDA",1,078,"VIRGIN ISLANDS, U.S.",23,0,0,,,,, 38017,"AMERADA HESS CORP...

  2. Construction Kathryn Hess

    E-Print Network [OSTI]

    Thévenaz, Jacques

    The Cobar Construction Kathryn Hess A (neo)classical approach Topological applications of DCSH structure On beyond chain complexes The Cobar Construction Kathryn Hess Institute of Geometry, Algebra 2006 #12;The Cobar Construction Kathryn Hess A (neo)classical approach Topological applications of DCSH

  3. Michael Hess | Department of Energy

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighand Retrievals fromprocess used in mining -MODERN GRID S T RMichaelHess

  4. Hydrology and Earth System Sciences, 10, 3148, 2006 www.copernicus.org/EGU/hess/hess/10/31/

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Hydrology and Earth System Sciences, 10, 31­48, 2006 www.copernicus.org/EGU/hess/hess/10/31/ SRef-ID: 1607-7938/hess/2006-10-31 European Geosciences Union Hydrology and Earth System Sciences Transport International Centre for Hydrology "Dino Tonini" and Dipartimento IMAGE, Universit`a di Padova, via Loredan 20

  5. Hydrology and Earth System Sciences, 9, 111126, 2005 www.copernicus.org/EGU/hess/hess/9/111/

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Hydrology and Earth System Sciences, 9, 111­126, 2005 www.copernicus.org/EGU/hess/hess/9/111/ SRef-ID: 1607-7938/hess/2005-9-111 European Geosciences Union Hydrology and Earth System Sciences Constraints of artificial neural networks for rainfall-runoff modelling: trade-offs in hydrological state representation

  6. Hydrology and Earth System Sciences, 10, 1929, 2006 www.copernicus.org/EGU/hess/hess/10/19/

    E-Print Network [OSTI]

    Boyer, Edmond

    Hydrology and Earth System Sciences, 10, 19­29, 2006 www.copernicus.org/EGU/hess/hess/10/19/ SRef-ID: 1607-7938/hess/2006-10-19 European Geosciences Union Hydrology and Earth System Sciences Transport. Marani International Centre for Hydrology "Dino Tonini" and Dipartimento IMAGE, Universit`a di Padova

  7. Hydrology and Earth System Sciences, 10, 127137, 2006 www.copernicus.org/EGU/hess/hess/10/127/

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Hydrology and Earth System Sciences, 10, 127­137, 2006 www.copernicus.org/EGU/hess/hess/10/127/ SRef-ID: 1607-7938/hess/2006-10-127 European Geosciences Union Hydrology and Earth System Sciences Centre, Maun, Botswana Received: 11 August 2005 ­ Published in Hydrology and Earth System Sciences

  8. Hydrology and Earth System Sciences, 9, 314, 2005 www.copernicus.org/EGU/hess/hess/9/3/

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Hydrology and Earth System Sciences, 9, 3­14, 2005 www.copernicus.org/EGU/hess/hess/9/3/ SRef-ID: 1607-7938/hess/2005-9-3 European Geosciences Union Hydrology and Earth System Sciences Bringing it all, Dublin, Ireland Received: 6 December 2004 ­ Published in Hydrology and Earth System Sciences Discussions

  9. Hydrology and Earth System Sciences, 9, 139155, 2005 www.copernicus.org/EGU/hess/hess/9/139/

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Hydrology and Earth System Sciences, 9, 139­155, 2005 www.copernicus.org/EGU/hess/hess/9/139/ SRef-ID: 1607-7938/hess/2005-9-139 European Geosciences Union Hydrology and Earth System Sciences Using stable isotope tracers to assess hydrological flow paths, residence times and landscape influences in a nested

  10. Hydrology and Earth System Sciences, 9, 95109, 2005 www.copernicus.org/EGU/hess/hess/9/95/

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Hydrology and Earth System Sciences, 9, 95­109, 2005 www.copernicus.org/EGU/hess/hess/9/95/ SRef-ID: 1607-7938/hess/2005-9-95 European Geosciences Union Hydrology and Earth System Sciences A conceptual glacio-hydrological model for high mountainous catchments B. Schaefli, B. Hingray, M. Niggli, and A. Musy

  11. Hydrology and Earth System Sciences, 10, 7991, 2006 www.copernicus.org/EGU/hess/hess/10/79/

    E-Print Network [OSTI]

    Boyer, Edmond

    Hydrology and Earth System Sciences, 10, 79­91, 2006 www.copernicus.org/EGU/hess/hess/10/79/ SRef-ID: 1607-7938/hess/2006-10-79 European Geosciences Union Hydrology and Earth System Sciences Scale, USA Received: 1 August 2005 ­ Published in Hydrology and Earth System Sciences Discussions: 30 August

  12. Systems of Hess-Appel'rot type

    E-Print Network [OSTI]

    Vladimir Dragovic; Borislav Gajic

    2006-02-09T23:59:59.000Z

    We construct higher-dimensional generalizations of the classical Hess-Appel'rot rigid body system. We give a Lax pair with a spectral parameter leading to an algebro-geometric integration of this new class of systems, which is closely related to the integration of the Lagrange bitop performed by us recently and uses Mumford relation for theta divisors of double unramified coverings. Based on the basic properties satisfied by such a class of systems related to bi-Poisson structure, quasi-homogeneity, and conditions on the Kowalevski exponents, we suggest an axiomatic approach leading to what we call the "class of systems of Hess-Appel'rot type".

  13. Aspects of Hess' Acquisition of American Oil & Gas

    Reports and Publications (EIA)

    2010-01-01T23:59:59.000Z

    On July 27, 2010, Hess Corporation announced that it had agreed to acquire American Oil & Gas, Inc. in a stock-only transaction worth as much as $488 million (based on Hess' closing price of $53.30/share, anticipated number of newly issued shares, and $30 million credit facility extended to American Oil & Gas prior to closing).

  14. In Retirement, Rex Hess Recalls the Pathway to Discovery IlliniStudio

    E-Print Network [OSTI]

    Gilbert, Matthew

    In Retirement, Rex Hess Recalls the Pathway to Discovery IlliniStudio Faculty Retirement By Lisa Chung After more than 20 years at the University of Illinois, Dr. Rex Hess retired in 2009 the prepared mind." An early interest in the arts followed by pre-law studies at the University of Missouri

  15. Hess Retail Natural Gas and Elec. Acctg. (Maine) | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open Energy InformationHebeiProgramEnergy Information HessHess

  16. Localising the H.E.S.S. Galactic Centre point source

    E-Print Network [OSTI]

    C. van Eldik; O. Bolz; I. Braun; G. Hermann; J. Hinton; W. Hofmann

    2007-09-24T23:59:59.000Z

    Observations by the H.E.S.S. system of imaging atmospheric Cherenkov telescopes provide the most sensitive measurements of the Galactic Centre region in the energy range 150 GeV - 30 TeV. The vicinity of the kinetic centre of our galaxy harbours numerous objects which could potentially accelerate particles to very high energies (VHE, > 100 GeV) and thus produce the Gamma-ray flux observed. Within statistical and systematic errors, the centroid of the point-like emission measured by H.E.S.S. was found to be in good agreement with the position of the supermassive black hole Sgr A* and the recently discovered PWN candidate G359.95-0.04. Given a systematic pointing error of about 30'', a possible association with the SNR Sgr A East could not be ruled out with the 2004 H.E.S.S. data. In this contribution an update is given on the position of the H.E.S.S. Galactic Centre source using 2005/2006 data. The systematic pointing error is reduced to 6'' per axis using guiding telescopes for pointing corrections, making it possible to exclude with high significance Sgr A East as the source of the VHE Gamma-Rays.

  17. H.E.S.S. observations of the supernova remnant RCW 86

    E-Print Network [OSTI]

    S. Hoppe; M. Lemoine-Goumard; for the H. E. S. S. Collaboration

    2007-10-10T23:59:59.000Z

    The shell-type supernova remnant (SNR) RCW 86 - possibly associated with the historical supernova SN 185 - was observed during the past three years with the High Energy Stereoscopic System (H.E.S.S.), an array of four atmospheric-Cherenkov telescopes located in Namibia. The multi-wavelength properties of RCW 86, e.g. weak radio emission and North-East X-ray emission almost entirely consisting of synchroton radiation, resemble those of two very-high energy (VHE; > 100 GeV) gamma-ray emitting SNRs RX J1713.7-3946 and RX J0852-4622. The H.E.S.S. observations reveal a new extended source of VHE gamma-ray emission.The morphological and spectral properties of this new source will be presented.

  18. VERITAS Observations of the Unidentified Point Source HESS J1943+213

    E-Print Network [OSTI]

    ,

    2015-01-01T23:59:59.000Z

    The H.E.S.S. Galactic plane scan has revealed a large population of Galactic very high energy (VHE; E > 100 GeV) emitters. The majority of the galactic sources are extended and can typically be associated with pulsar wind nebulae (35%) and supernova remnants (21%), while some of the sources remain unidentified (31%). A much smaller fraction of point-like sources (5 in total, corresponding to 4%) are identified as gamma-ray binaries. Active galactic nuclei located behind the Galactic plane are also a potential source class. An active galaxy could be identified in the VHE regime by a point like extension, a high variability amplitude (up to a factor of 100) and a typically soft spectrum (due to absorption by the extra-galactic background light). Here we report on VERITAS observations of HESS J1943+213, an unidentified point source discovered to emit above 470 GeV during the extended H.E.S.S. Galactic plane scan. This source is thought to be a distant BL Lac object behind the Galactic plane and, though it exhibi...

  19. Hess Retail Natural Gas and Elec. Acctg. (District of Columbia) | Open

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open Energy InformationHebeiProgramEnergy Information Hess

  20. Hess Retail Natural Gas and Elec. Acctg. (New Hampshire) | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open Energy InformationHebeiProgramEnergyInformation Hess

  1. Hess Retail Natural Gas and Elec. Acctg. (Rhode Island) | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural Gas and Elec. Acctg.

  2. Multi-Zone Modeling of the Pulsar Win Nebula HESS J1825-137

    SciTech Connect (OSTI)

    Van Etten, Adam; Romani, Roger W.; /Stanford U., Phys. Dept.

    2011-11-08T23:59:59.000Z

    The pulsar wind nebula associated with PSR J1826-1334, HESS J1825-137, is a bright very high energy source with an angular extent of {approx} 1{sup o} and spatially-resolved spectroscopic TeV measurements. The gamma-ray spectral index is observed to soften with increasing distance from the pulsar, likely the result of cooling losses as electrons traverse the nebula. We describe analysis of X-ray data of the extended nebula, as well as 3-D time-dependent spectral energy distribution modeling, with emphasis on the spatial variations within HESS J1825-137. The multi-wavelength data places significant constraints on electron injection, transport, and cooling within the nebula. The large size and high nebular energy budget imply a relatively rapid initial pulsar spin period of 13 {+-} 7 ms and an age of 40 {+-} 9 kyr. The relative fluxes of each VHE zone can be explained by advective particle transport with a radially decreasing velocity profile with v(r) {proportional_to} r{sup -0.5}. The evolution of the cooling break requires an evolving magnetic field which also decreases radially from the pulsar, B(r, t) {proportional_to} r{sup -0.7} E(t){sup 1/2}. Detection of 10 TeV flux {approx} 80 pc from the pulsar requires rapid diffusion of high energy particles with {tau}{sub esc} {approx} 90 (R/10 pc){sup 2}(E{sub e}/100TeV){sup -1} year, contrary to the common assumption of toroidal magnetic fields with strong magnetic confinement. The model predicts a rather uniform Fermi LAT surface brightness out to {approx} 1{sup o} from the pulsar, in good agreement with the recently discovered LAT source centered 0.5{sup o} southwest of PSR J1826-1334 with extension 0.6 {+-} 0.1{sup o}.

  3. Limits on Primordial Black Hole evaporation with the H.E.S.S. array of Cherenkov telescopes

    E-Print Network [OSTI]

    Glicenstein, J-F; Vivier, M; Herr, T

    2013-01-01T23:59:59.000Z

    Data collected by the H.E.S.S. array between 2004 and 2012 have been used to search for photon bursts from primordial black hole explosions. Bursts were searched for in a 30 second time-window. The duration of the search window has been optimized to increase the burst signal while keeping the statistical background low. No evidence for a burst signal was found. Preliminary upper limits on the local rate of PBH explosions of $1.4\\times 10^{4} {pc}^{-3} {yr}^{-1}$ have been obtained, which improve previously published limits by almost an order of magnitude

  4. Discovery of new X-ray sources near the unidentified gamma-ray source HESS J1841-055

    E-Print Network [OSTI]

    Nobukawa, K K; Tsuru, T G; Koyama, K

    2015-01-01T23:59:59.000Z

    HESS J1841$-$055 is a diffuse unidentified gamma-ray source with the size of $\\sim\\,1.3^{\\circ}\\times\\,1^{\\circ}$. No conclusive counterpart in other wavelengths has so far detected. To search for X-rays responsible for the TeV emission, the Suzaku observations were conducted, which covered a half region of the HESS source. In the soft band (0.5-2.0 keV), we discovered a diffuse emission, Suzaku J1840.2$-$0552, with the size of $\\sim10'$. Since its spectrum was fitted by an optically thin thermal plasma model, Suzaku J1840.2$-$0552 is likely to be a supernova remnant. We also discovered an extended source, Suzaku J1840.2$-$0544, in the hard band (2.0-8.0 keV) with an emission line at 6.1 keV. From the spectral feature and large interstellar absorption, this source is likely to be a cluster of galaxies behind the Galactic plane at the red-shift of $\\sim$0.09. The other diffuse source spatially overlaps with the SNR candidate G26.6$-$0.2, which shows a non-thermal dominant spectrum. Since no other candidate is ...

  5. Semi-Blind Cancellation of IQ-Imbalances Matthias Hesse, Student Member, IEEE, Marko Mailand, Student Member, IEEE, Hans-Joachim Jentschel,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Semi-Blind Cancellation of IQ-Imbalances Matthias Hesse, Student Member, IEEE, Marko Mailand iterative blind source separation (IBSS) as well as information about the modulation scheme used (hence the term semi-blind). The novelty of our approach lies in the fact that we match the nonlinearity involved

  6. Proceedings of ICRC 2001: 2896 c Copernicus Gesellschaft 2001 The central data acquisition system for the H.E.S.S. telescope system

    E-Print Network [OSTI]

    to the software design. 1 Introduction The High Energy Stereoscopic System, H.E.S.S. is a next generation imaging radiometers, cloud scanners, and op- tical telescopes for controlling the atmospheric properties. The Data. The signals of each pixel of a camera are read out via a high gain and a low gain path with 10 bits dynamic

  7. 29th International Cosmic Ray Conference Pune (2005) 00, 101104 Multi-resolution analysis of the H.E.S.S. Galactic Survey Sources and

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    2005-01-01T23:59:59.000Z

    radian of the Galactic Plane was scanned by the H.E.S.S. (High Energy Stereoscopic System) telescopes for the detection and mapping of extended VHE gamma-ray sources (e.g., SNR RXJ1713.7-3946 [2]). A survey, pulsars and pulsar wind nebulae (PWN), micro-quasars and also possible new classes of sources. Eight new

  8. XMM-Newton Observations Reveal the X-ray Counterpart of the Very-high-energy gamma-ray Source HESS J1640-465

    SciTech Connect (OSTI)

    Funk, S.; Hinton, J.A.; Puhlhofer, G.; Aharonian, F.A.; Hofmann, W.; Reimer, O.; Wagner, S.; /KIPAC, Menlo Park /Heidelberg, Max Planck Inst. /Leeds U. /Dublin Inst. /Stanford U., HEPL; Funk, S.; Hinton, J.A.; Puehlhofer, G.; Aharonian, F.A.; Hofmann, W.; Reimer, O.; Wagner, S.

    2007-03-05T23:59:59.000Z

    We present X-ray observations of the as of yet unidentified very high-energy (VHE) {gamma}-ray source HESS J1640-465 with the aim of establishing a counterpart of this source in the keV energy range, and identifying the mechanism responsible for the VHE emission. The 21.8 ksec XMM-Newton observation of HESS J1640-465 in September 2005 represents a significant improvement in sensitivity and angular resolution over previous ASCA studies in this region. These new data show a hard-spectrum X-ray emitting object at the centroid of the H.E.S.S. source, within the shell of the radio Supernova Remnant (SNR) G338.3-0.0. This object is consistent with the position and flux previously measured by both ASCA and Swift-XRT but is now shown to be significantly extended. We argue that this object is very likely the counterpart to HESS J1640-465 and that both objects may represent the Pulsar Wind Nebula of an as of yet undiscovered pulsar associated with G338.3-0.0.

  9. The properties of the putative pulsar associated with IGR J18135-1751/HESS J1813-178

    E-Print Network [OSTI]

    A. J. Dean; A. B. Hill

    2008-04-21T23:59:59.000Z

    Context: We investigate the possible theoretical properties of the putative pulsar associated with the pulsar wind nebula IGR J18135-1751/HESS J1813-178 based upon recent gamma-ray observations and archival multi-wavelength observations. Aims: We show that when using the standard equations for magnetic dipole radiation with recent soft gamma-ray observations leads to deriving an extreme set of parameters (magnetic field, period and spin down rate) for the putative pulsar. Alternative scenarios that generate more typical parameter values are explored. Methods: The properties of the putative pulsar are calculated assuming that the 20-100 keV luminosity corresponds to 1% of Edot, that the source is 4.5 kpc away, and that the pulsar age is 300 yrs. This gives P = 0.55 s, Pdot = 3E-11 s/s, and B = 1.28E14 G. This is a very extreme set compared to the population of known pulsars in PWN systems. Using the equations for magnetic dipole losses makes it possible to adjust the initial assumptions to see what is required for a more reasonable set of pulsar parameters. Results: The current measured properties for IGR J18135-1751/HESS J1813-178 (i.e. luminosity, distance, and age) result in extreme properties of the unseen pulsar within the PWN. The simplest method for achieving more reasonable properties for the pulsar is to decouple the spin-down age of the pulsar from the actual age for the system.

  10. Discovery of gamma-ray emission from the shell-type supernova remnant RCW 86 with H.E.S.S

    E-Print Network [OSTI]

    HESS Collaboration; F. Aharonian

    2008-10-15T23:59:59.000Z

    The shell-type supernova remnant (SNR) RCW 86, possibly associated with the historical supernova SN 185, with its relatively large size (about 40' in diameter) and the presence of non-thermal X-rays is a promising target for gamma-ray observations. The high sensitivity, good angular resolution of a few arc minutes and the large field of view of the High Energy Stereoscopic System (H.E.S.S.) make it ideally suited for the study of the gamma-ray morphology of such extended sources. H.E.S.S. observations have indeed led to the discovery of the SNR RCW 86 in very high energy (VHE; E > 100 GeV) gamma-rays. With 31 hours of observation time, the source is detected with a statistical significance of 8.5 sigma and is significantly more extended than the H.E.S.S. point spread function. Morphological studies have been performed and show that the gamma-ray flux does not correlate perfectly with the X-ray emission. The flux from the remnant is ~10% of the flux from the Crab nebula, with a similar photon index of about 2.5. Possible origins of the very high energy gamma-ray emission, via either Inverse Compton scattering by electrons or the decay of neutral pions produced by proton interactions, are discussed on the basis of spectral features obtained both in the X-ray and gamma-ray regimes.

  11. Detection of VHE gamma-ray emission from the distant blazar 1ES 1101-232 with H.E.S.S. and broadband characterisation

    E-Print Network [OSTI]

    Akhperjanian, A G; Beilicke, M; Benbow, W; Berge, D; Bernlöhr, K; Boisson, C; Bolz, O; Borrel, V; Braun, I; Brion, E; Brown, A M; Buhler, R; Büsching, I; Boutelier, T; Carrigan, S; Chadwick, P M; Chounet, L M; Coignet, G; Cornils, R; Costamante, L; Degrange, B; Dickinson, H J; Djannati-Atai, A; O'Connor-Drury, L; Dubus, G; Egberts, K; Emmanoulopoulos, D; Espigat, P; Farnier, C; Feinstein, F; Ferrero, E; Fiasson, A; Fontaine, G; Funk, Seb; Funk, S; Fussling, M; Gallant, Y A; Giebels, B; Glicenstein, J F; Glück, B; Goret, P; Hadjichristidis, C; Hauser, D; Hauser, M; Heinzelmann, G; Henri, G; Hermann, G; Hinton, J A; Hoffmann, A; Hofmann, W; Holleran, M; Hoppe, S; Horns, D; Jacholkowska, A; De Jager, O C; Kendziorra, E; Kerschhaggl, M; Khelifi, B; Komin, Nu; Kosack, K; Lamanna, G; Latham, I J; Le Gallou, R; Lemiere, A; Lemoine-Goumard, M; Lohse, T; Martin, J M; Martineau-Huynh, O; Marcowith, A; Masterson, C; Maurin, G; McComb, T J L; Moulin, E; De Naurois, Mathieu; Nedbal, D; Nolan, S J; Noutsos, A; Olive, J P; Orford, K J; Osborne, J L; Panter, M; Pelletier, G; Petrucci, P O; Pita, S; Pühlhofer, G; Punch, M; Ranchon, S; Raubenheimer, B C; Raue, M; Rayner, S M; Ripken, J; Rob, L; Rolland, L; Rosier-Lees, S; Rowell, G; Sahakian, V V; Santangelo, A; Sauge, L; Schlenker, S; Schlickeiser, R; Schroder, R; Schwanke, U; Schwarzburg, S; Schwemmer, S; Shalchi, A; Sol, H; Spangler, D; Spanier, F; Steenkamp, R; Stegmann, C; Superina, G; Tam, P H; Tavernet, J P; Terrier, R; Tluczykont, M; Van Eldik, C; Vasileiadis, G; Venter, C; Vialle, J P; Vincent, P; Völk, H J; Wagner, S J; Ward, M

    2007-01-01T23:59:59.000Z

    The blazar 1ES 1101-232 was observed with the High Energy Stereoscopic System (H.E.S.S.) of Atmospheric Cherenkov Telescopes (ACT) in 2004 and 2005, for a live time of 43 hours. VHE (E > 10^11 eV) gamma-rays were detected for the first time from this object. VHE observations of blazars are used to investigate the inner parts of the blazar jets, and also to study the extragalactic background light (EBL) in the near-infrared band. Observations in 2005 were conducted in a multiwavelength campaign, together with the RXTE satellite and optical observations. In 2004, simultaneous observations with XMM-Newton were obtained. 1ES 1101-232 was detected with H.E.S.S. with an excess of 722 photons, at a significance of 12 sigma. The measured VHE gamma-ray flux amounts to dN/dE = (5.63 +- 0.89) x 10^-13 (E/TeV)^-(2.94 +- 0.20) cm^-2 s^-1 TeV^-1, above a spectral energy threshold of 225 GeV. No significant variation of the VHE gamma-ray flux on any time scale was found. 1ES 1101-232 exhibits a very hard spectrum, and at a ...

  12. The INTEGRAL - HESS/MAGIC connection: a new class of cosmic high energy accelerators from keV to TeV

    E-Print Network [OSTI]

    Pietro Ubertini

    2006-05-09T23:59:59.000Z

    The recent completion and operation of the High Energy Stereoscopic System, an array of ground based imaging Cherenkov telescopes, has provided a survey with unprecedented sensitivity of the inner part of the Galaxy and revealed a new population of very high energy gamma-rays sources emitting at E$>$100 GeV. Most of them were reported to have no known radio or X-ray counterpart and hypothesised to be representative of a new class of dark nucleonic cosmic sources. In fact, very high energy gamma-rays with energies E $>$ 10$^{11}$ eV are the best proof of non-thermal processes in the universe and provide a direct in-site view of matter-radiation interaction at energies by far greater than producible in ground accelerators. At lower energy INTEGRAL has regularly observed the entire galactic plane during the first 1000 day in orbit providing a survey in the 20-100 keV range resulted in a soft gamma-ray sky populated with more than 200 sources, most of them being galactic binaries, either BHC or NS. Very recently, the INTEGRAL new source IGR J18135-1751 has been identified as the soft gamma-ray counterpart of HESS J1813-178 and AXJ1838.0-0655 as the X/gamma-ray counterpart of HESS J1837-069. Detection of non thermal radio, X and gamma-ray emission from these TeV sources is very important to discriminate between various emitting scenarios and, in turn, to fully understand their nature. The implications of these new findings in the high energy Galactic population will be addressed.

  13. RPT_PERIOD","R_S_NAME","LINE_NUM","PROD_CODE","PROD_NAME","PORT...

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

    HESS CORP ","SEWAREN","NJ","NEW JERSEY",1 38383,"AMERADA HESS CORP ",105,138,"MOTOR GAS BLENDING COMPONENTS, ALL OTHER",1004,"PERTH AMBOY, NJ","NEW JERSEY",1,670,"NIGERIA...

  14. RPT_PERIOD","R_S_NAME","LINE_NUM","PROD_CODE","PROD_NAME","PORT...

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

    MN","MINNESOTA",2,260,"CANADA",11,0,0,,,,, 37652,"AMERADA HESS CORP ",1,152,"MOTOR GAS, OTHER FINISHED",1601,"CHARLESTON, SC","SOUTH CAROLINA",1,150,"ARGENTINA",234,0,0,...

  15. RPT_PERIOD","R_S_NAME","LINE_NUM","PROD_CODE","PROD_NAME","PORT...

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

    PENNSYLVANIA",1,078,"VIRGIN ISLANDS, U.S.",51,0,0,,,,, 34365,"AMERADA HESS CORP",1,152,"MOTOR GAS, OTHER FINISHED",1801,"TAMPA, FL","FLORIDA",1,078,"VIRGIN ISLANDS,...

  16. 34730,"AGWAY PETRO CORP",1,231,"PROPANE/NGL",0712,"CHAMPL-RS...

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

    PT, NY","NEW YORK",1,260,"CANADA",3,0,0,,,,, 34730,"AMERADA HESS CORP",1,152,"MOTOR GAS, OTHER FINISHED",1703,"SAVANNAH,GA","GEORGIA",1,078,"VIRGIN ISLANDS,...

  17. 35095,"AGWAY PETRO CORP",1,231,"PROPANE/NGL",0712,"CHAMPL-RS...

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

    TX","TEXAS",3,595,"MEXICO",44,0,0,,,,, 35095,"AMERADA HESS CORP",1,152,"MOTOR GAS, OTHER FINISHED",1703,"SAVANNAH,GA","GEORGIA",1,078,"VIRGIN ISLANDS,...

  18. RPT_PERIOD","R_S_NAME","LINE_NUM","PROD_CODE","PROD_NAME","PORT...

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

    MI","MICHIGAN",2,260,"CANADA",34,0,0,,,,, 34000,"AMERADA HESS CORP",1,152,"MOTOR GAS, OTHER FINISHED",5203,"PT EVERGLADE, FL","FLORIDA",1,078,"VIRGIN ISLANDS,...

  19. Upgrading Amerada-type survey clocks for high-temperature geothermal service

    SciTech Connect (OSTI)

    Major, B.H.; Witten, C.L.

    1980-09-01T23:59:59.000Z

    The Amerada type subsurface recording gauges have been used by the oil and gas industry for many years. These mechanical logging instruments are currently used by the growing goethermal industry. As the gauges were designed for service in low-temperature oil and gas wells, a significant number of failures are occurring at elevated geothermal temperatures. The spring driven mechanical survey clocks appear to be the primary cause of the failures. The clock mechanisms tend to stop or lock-up when exposed to temperatures as high as 300/sup 0/C. This paper summarizes a project that was undertaken to upgrade the survey clocks to 300/sup 0/C capability. The major problems causing clock failure were indentified and corrected by straightforward design modifications together with special lubrication of the moving parts. Several clocks so modified performed reliably, both during laboratory oven tests and during field tests that were performed in actual geothermal wells at temperatures up to 330/sup 0/C.

  20. SUR LES DILECTRIQUES HTROGNES; PAR M. A. HESS.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ~'~,~ ... lenrs pouvoirs inducteurs et r, t,', r~ ... leurs résis- tances spécifiqu es : Dans le cas particulier

  1. Hybrid energy systems (HESs) using small modular reactors (SMRs)

    SciTech Connect (OSTI)

    S. Bragg-Sitton

    2014-10-01T23:59:59.000Z

    Large-scale nuclear reactors are traditionally operated for a singular purpose: steady-state production of dispatchable baseload electricity that is distributed broadly on the electric grid. While this implementation is key to a sustainable, reliable energy grid, small modular reactors (SMRs) offer new opportunities for increased use of clean nuclear energy for both electric and thermal ap plications in more locations – while still accommodating the desire to support renewable production sources.

  2. Hess to serve on editorial advisory board | EMSL

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

    for the reference book. The Encyclopedia of Soil Science is a comprehensive collection of academic articles covering all branches of soil science, including pedology, mineralogy,...

  3. PHILIPPE-JEAN HESSE JEAN-PIERRE LE CROM

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , Paris, IHTP et CRHMSS, 1992, pp. 335-342 ; Jean Bennet, « La mutualité pendant la Seconde Guerre

  4. Hess Retail Natural Gas and Elec. Acctg. (Connecticut) | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open Energy InformationHebeiProgram JumpHenneckeInformation

  5. Hess Retail Natural Gas and Elec. Acctg. (Delaware) | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open Energy InformationHebeiProgram

  6. Hess Retail Natural Gas and Elec. Acctg. (Maryland) | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open Energy InformationHebeiProgramEnergy Information

  7. Hess Retail Natural Gas and Elec. Acctg. (Massachusetts) | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open Energy InformationHebeiProgramEnergy

  8. Hess Retail Natural Gas and Elec. Acctg. (Pennsylvania) | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open Energy

  9. Hydrology and Earth System Sciences, 9, 173183, 2005 www.copernicus.org/EGU/hess/hess/9/173/

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    - fortunately, useful in-situ observations are rarely available as area representative measurements and scatterometers is of- ten considered to impede hydrological applications. Nev- ertheless, even if most hydrologic moisture products are compared to measured runoff of the Zambezi River in south-eastern Africa for several

  10. Hydrology and Earth System Sciences, 9, 535547, 2005 www.copernicus.org/EGU/hess/hess/9/535/

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    areas, irrigation serves to increase yields, to at- tenuate the effects of droughts or, in the case), Germany 2Food and Agriculture Organization of the United Nations, Rome, Italy Received: 16 June 2005 land cover inventories. 1 Introduction Agriculture is by far the largest water-use sector, accounting

  11. A dense gas survey of the gamma-ray sources HESS J1731-347 and HESS J1729-345

    E-Print Network [OSTI]

    Maxted, Nigel; de Wilt, Phoebe; Burton, Michael; Renaud, Matthieu; Fukui, Yasuo; Hawkes, Jarryd; Blackwell, Rebecca; Voisin, Fabien; Lowe, Vicki; Aharonian, Felix

    2015-01-01T23:59:59.000Z

    The results of Mopra molecular spectral line observations towards the supernova remnant HESSJ1731-347 (G353.6-0.7) and the unidentified gamma-ray source HESSJ1729-345 are presented. Dense molecular gas in three different velocity-bands (corresponding to three Galactic arms) are investigated using the CS(1-0) line. The CS-traced component provides information about the dense target material in a hadronic scenario for gamma-ray production (cosmic rays interacting with gas) and an understanding of the dynamics. Furthermore, the effects of cosmic ray diffusion into dense gas may alter the gamma-ray spectrum to cause a flattening of spectra towards such regions. Dense molecular gas mass at a level of ~10^5 Mo was revealed in this survey, with mass of the order of ~10^3 Mo towards HESSJ1729-345 in each coincident Galactic arm, but no significant detection of dense molecular gas towards HESSJ1731-347 at the currently-preferred distance of ~5.2-6.2 kpc was discovered.

  12. Jason Smesrud, Bill Mansour, Mario Hess, and John Selker November 1997 Department of Bioresource Engineering

    E-Print Network [OSTI]

    Selker, John

    -move, or solid set sprinkler irrigation. For those with linear move or center pivot systems, all information occurs and can be burnt-off, if surface temperatures are too high, irrigation during the pre, light irrigation. Conversely, deep, excessive irrigation during this period promotes problems

  13. 10 Questions for a Spectroscopy Expert: Nancy Hess | Department of Energy

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directed off Energy.gov. Are you sureReportsofDepartmentSeriesDepartmentSmall toMaterials

  14. 10 Questions for a Spectroscopy Expert: Nancy Hess | Department of Energy

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

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742Energy China 2015ofDepartment ofCBFO-13-3322 2013of Energy July 1, 2013Antonio CheccoNancy

  15. Hess Retail Natural Gas and Elec. Acctg. (New York) | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open Energy InformationHebeiProgramEnergyInformation

  16. eHealth Research from the User's Perspective Bradford W. Hesse, PhD, Ben Shneiderman, PhD

    E-Print Network [OSTI]

    Shneiderman, Ben

    people do?" How can eHealth take part in national goals for healthcare reform to empower relationships (IT) to issues of personal health and health care has had a long and surprisingly complex history of IT applied to health care reflect the lessons learned from computer science more generally. The field

  17. Organophosphates as Solvents for Electrolytes in Electrochemical Andrew Hess, Greg Barber, Chen Chen, Thomas E. Mallouk, and Harry R. Allcock*

    E-Print Network [OSTI]

    , electrolyte, dye-sensitized solar cell, lithium batteries, fire-retardant 1. INTRODUCTION Dye-sensitized solar-retardant oligoalkyleneoxy- phosphates was synthesized for evaluation as liquid or gel-type electrolyte media for dye-sensitized solar cells (DSSCs) and secondary lithium batteries. Unoptimized DSSC electrolyte formulations for DSSCs

  18. Salt dome discoveries mounting in Mississippi

    SciTech Connect (OSTI)

    Ericksen, R.L. [Mississippi Office of Geology, Jackson, MS (United States)

    1996-06-17T23:59:59.000Z

    Exploratory drilling around piercement salt domes in Mississippi has met with a string of successes in recent months. Exploration of these salt features is reported to have been initiated through the review of non-proprietary, 2D seismic data and subsurface control. This preliminary data and work were then selectively upgraded by the acquisition of additional, generally higher quality, conventional 2D seismic lines. This current flurry of successful exploration and ensuing development drilling by Amerada Hess Corp. on the flanks of salt domes in Mississippi has resulted in a number of significant Hosston discoveries/producers at: Carson salt dome in Jefferson Davis County; Dry Creek salt dome in Covington County, Midway salt dome in lamar County, Monticello salt dome in Lawrence County, and Prentiss salt dome in Jefferson Davis County. The resulting production from these fields is gas and condensate, with wells being completed on 640 acre production units.

  19. Operational experience of FPSO Uisge Gorm

    SciTech Connect (OSTI)

    Voorst, O. van

    1996-12-31T23:59:59.000Z

    Bluewater was awarded a contract by Amerada Hess Limited to provide production services for the Fife Field in the North Sea using an FPSO based on a converted tanker. The contract required Bluewater to provide the production services form the wellhead to the refinery. The construction period of less than 17 months resulted in first oil in August 1995. Preparing for the operational phase and actual operation of the installation after first oil were also part of the contract. This paper briefly describes the construction phase, the preparatory phase for operations and the first 4.5 months of operations up to December 1995. The paper concludes that a wellhead to refinery contract is a feasible and commercially attractive solution for both oil company and FPSO contractor. The Fife Field could not have been developed if this contracting strategy had not been used, as after depletion of the Fife Field the Uisge Gorm will be available to be utilized on other fields.

  20. The shape and size of crowding for moving targets Peter J. Bex *, Steven C. Dakin, Anita J. Simmers

    E-Print Network [OSTI]

    Bex, Peter

    (Bondarko & Danilova, 1997; Hess, Dakin, & Kapoor, 2000). How- ever, crowding also occurs between target

  1. XES Nanoprobe for Hard X-Ray Region: Mitigating Degradation in Ni-ZEBRA Batteries Research Team: Mark Bowden, Kyle Alvine, Nancy Hess, Guosheng Li, Tamas Varga

    E-Print Network [OSTI]

    XES Nanoprobe for Hard X-Ray Region: Mitigating Degradation in Ni-ZEBRA Batteries Research Team scientific understanding of link between Ni-NiCl2 ZEBRA battery cycle degradation and FeS additive Chemical battery performance by poisoning Ni surfaces ­ optimizing Ni/NiCl2 distributions and conductive pathways

  2. Gras Dowr joins world`s FPSO fleet

    SciTech Connect (OSTI)

    NONE

    1997-05-05T23:59:59.000Z

    The Gras Dowr, a floating production, storage, and offloading vessel (FPSD) for Amerada Hess Ltd.`s North Sea Durward and Dauntless fields, is one of the latest additions to the world`s growing FPSO fleet. The Gras Dowr, anchored in about 90 m of water, lies between the Durward (U.K. Block 21/16) and Dauntless (U.K. Block 21/11) fields, about 3.5 km from the subsea wellhead locations. The Gras Dowr`s main functions, according to Bluewater Offshore Production Systems Ltd., are to: receive fluids from well risers; process incoming fluids to separate the fluid into crude, water, and gas; store dry crude oil and maintain the required temperature; treat effluent to allow for water discharge to the sea; compress gas for gas lift as a future option; provide chemical injection skid for process chemical injection; use a part of the produced gas for fuel gas, and flare excess gas; inject treated seawater into the injection wells; house power generation for process and offloading operation and utilities; offload to a tandem moored shuttle tanker including receiving liquid fuel from the same tanker; provide accommodations for operating and maintenance crews; allow helicopters landings and takeoffs; allow handling and storage of goods transported by supply vessels; moor a shuttle tanker; and control the subsea wells.

  3. Murray Gell-Mann den ttafaldiga

    E-Print Network [OSTI]

    Thévenaz, Jacques

    Murray Gell-Mann och den åttafaldiga vägen Kathryn Hess Lite partikelteori Matriser och Lie-algebror Representationer av Lie-algebror Murray Gell-Mann och den åttafaldiga vägen Kathryn Hess Institute of Geometry november 2008 #12;Murray Gell-Mann och den åttafaldiga vägen Kathryn Hess Lite partikelteori Matriser och

  4. assessing landscape values: Topics by E-print Network

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

    Raleigh's Urban Forest 2008 Pilot Project June 30, 2008 Prepared Hess, George 19 Using Fractal Analysis To Assess How Species Perceive Landscape Structure CiteSeer Summary: To...

  5. Constraints on the TeV source population and its contribution to the galactic diffuse TeV emission

    E-Print Network [OSTI]

    Casanova, Sabrina

    2007-01-01T23:59:59.000Z

    The detection by the HESS atmospheric Cerenkov telescope of fourteen new sources from the Galactic plane makes it possible to estimate the contribution of unresolved sources like those detected by HESS to the diffuse Galactic emission measured by the Milagro Collaboration. The number-intensity relation and the luminosity function for the HESS source population are investigated. By evaluating the contribution of such a source population to the diffuse emission we conclude that a significant fraction of the TeV energy emission measured by the Milagro experiment could be due to unresolved sources like HESS sources. Predictions concerning the number of sources which Veritas, Milagro, and HAWC should detect are also given.

  6. Contacts For "H" | EMSL

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

    on the chemistry and photochemistry of small probe molecules on anatase and rutile titanium dioxide single crystal surfaces. Nancy J. Hess Science Theme Lead Send Email (509)...

  7. Constraints on the TeV source population and its contribution to the galactic diffuse TeV emission

    E-Print Network [OSTI]

    Sabrina Casanova; Brenda L. Dingus

    2007-11-19T23:59:59.000Z

    The detection by the HESS atmospheric Cerenkov telescope of fourteen new sources from the Galactic plane makes it possible to estimate the contribution of unresolved sources like those detected by HESS to the diffuse Galactic emission measured by the Milagro Collaboration. The number-intensity relation and the luminosity function for the HESS source population are investigated. By evaluating the contribution of such a source population to the diffuse emission we conclude that a significant fraction of the TeV energy emission measured by the Milagro experiment could be due to unresolved sources like HESS sources. Predictions concerning the number of sources which Veritas, Milagro, and HAWC should detect are also given.

  8. Approaches To Integrating A HIgh Penertration Of Solar PV and CPV Onto The Electrical Grid

    E-Print Network [OSTI]

    Hill, Steven Craig

    2013-01-01T23:59:59.000Z

    Happy Camp Sanitation District  Harwood Products, Inc.   Healdsburg City  Herlong PUD  Hess Collection Winery  Hidden Valley 

  9. Conversion of existing tanker to North Sea FPSO use

    SciTech Connect (OSTI)

    Voorst, O. van; Baan, J. de; Loenhout, A. van; Krekel, M.

    1995-12-01T23:59:59.000Z

    The use of existing tankers as a permanently moored floating storage off loading (FSO) or floating production storage and off loading (FPSO) has been wide spread in the oil industry ever since tankers were used for storage. However, the application of an existing tanker for North Sea FPSO use meeting the stringent demands of the regulatory bodies and the harsh environment of the North Sea has withheld operators from using existing tankers in the North Sea. The acceptance of FPSO technology in the North Sea and the proven ability to moor a tanker with a passive mooring system in a harsh environment has opened the avenue to use existing tankers for use as an FPSO in the North Sea. This is also driven by the search for cost effective solutions for field development plans in order to make marginal fields economically exploitable. The potential reuse of an FPSO on a different location also makes the depreciation period of the FPSO vessel life related instead of field life related. Many issues related to the use of an FPSO in the North Sea are currently subject of papers at various forums. This paper, however, only addresses three crucial areas: (1) the criteria for selection of an existing tanker; (2) the use of a passive mooring system; (3) the fatigue assessment and required modifications. The paper is based on experiences gained during the engineering, design and construction phase of the UISGE GORM, the FPSO, which Bluewater will initially use for Amerada Hess Limited`s Fife Field on the UK continental shelf and confirms that the conversion of a suitable tanker to North Sea FPSO use is a technically flexible and an economically attractive solution.

  10. Power Maps in Algebra and

    E-Print Network [OSTI]

    Thévenaz, Jacques

    Power Maps in Algebra and Topology Kathryn Hess Preface The case of commutative algebras The Hochschild complex of a twisting cochain Power maps on the Hochschild complex Topological relevance Power Compostela, 17 September 2008 #12;Power Maps in Algebra and Topology Kathryn Hess Preface The case

  11. Discovery of two candidate pulsar wind nebulae in very-high-energy gamma rays

    E-Print Network [OSTI]

    H. E. S. S. Collaboration; :; F. Aharonian

    2007-05-11T23:59:59.000Z

    We present the discovery of two very-high-energy gamma-ray sources in an ongoing systematic search for emission above 100 GeV from pulsar wind nebulae in survey data from the H.E.S.S. telescope array. Imaging Atmospheric Cherenkov Telescopes are ideal tools for searching for extended emission from pulsar wind nebulae in the very-high-energy regime. H.E.S.S., with its large field of view of 5 degrees and high sensitivity, gives new prospects for the search for these objects. An ongoing systematic search for very-high-energy emission from energetic pulsars over the region of the Galactic plane between -60 degrees wind nebulae, HESS J1718-385 and HESS J1809-193. H.E.S.S. has proven to be a suitable instrument for pulsar wind nebula searches.

  12. Fourth Annual Ethical Leadership Conference Panel Drivers, Challenges, and Strategies for Future of Corporate

    E-Print Network [OSTI]

    Lin, Xiaodong

    Fourth Annual Ethical Leadership Conference Panel Drivers, Challenges, and Strategies for Future, Academy of Management Review, Academy of Management Perspectives, Business & Society, Long Range Planning Social Responsibility for Hess Corporation, a global integrated energy company based in New York City

  13. Clin. Vision Sci. Vol. 2, No. 3, pp. 143-158, 1988 Printed in Great Britain. All rights reserved

    E-Print Network [OSTI]

    Kersten, Dan

    CLOUDY MEDIA D. KERSTEN Psychology Department, Brown University, Providence, RI 02912, U.S.A. R. F. HEss imposed by the receptor spacing (Campbell and Green, 1965). As Green points out, in practice it can

  14. HEADING FRONTMATTER

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

    5. Hess, J.R.; Wright, C.T.; and Kenney, K.L. (2007). Cellulosic Biomass Feedstocks and Logistics for Ethanol Production. Biofuels, Bioprod. Biorefin., 1(3),...

  15. Structural analysis of the perdido fold belt: timing, evolution, and structural style

    E-Print Network [OSTI]

    Waller, Troy Dale, II

    2007-09-17T23:59:59.000Z

    the upper portion consist of fine grained and muddy siliciclastics which are typical of turbidite and other typical deep water deposits. 2-D, prestacked, depth-migrated seismic data (TGS Phase 45) was interpreted in conjunction with Hess Corporation...

  16. Nutrient Management Advisory Board ~ Approved ~

    E-Print Network [OSTI]

    Guiltinan, Mark

    : Members: Jim Brubaker, Meat Poultry Representative Lamonte Garber, Environmental Representative Denton Hawthorne, Agriculture Lender Representative Katrine Parmley-Gates, Feed Industry Representative Dean Collamer, Fertilizer Industry Representative Gary Heim, Non-Framer Citizen Representative John Hess, Dairy

  17. DOE Announces Award of a Contract to Repurchase Heating Oil for...

    Energy Savers [EERE]

    (NEHHOR). The purchased oil is expected to be delivered to the Hess First Reserve terminal at Perth Amboy, NJ in New York Harbor later this week. The award resulted from a...

  18. Course Information --EE 531 Semiconductor Devices and Device Simulation

    E-Print Network [OSTI]

    Hochberg, Michael

    of Semiconductor Devices" by Hess "Si Processing for the VLSI Era: Vol. 3-- The Submicron MOSFET" by Wolf "Advanced: 20% Exam 1: 30% Exam 2: 30% Project: 20% Prerequisite: Semiconductor Devices (EE 482) or equivalent

  19. Contribution of unresolved point sources to the galactic diffuse emission

    E-Print Network [OSTI]

    Sabrina Casanova; Brenda L. Dingus

    2006-09-12T23:59:59.000Z

    The detection by the HESS atmospheric Cherenkov telescope of fifteen new sources from the Galactic plane makes it possible to estimate the contribution of unresolved point sources like those detected by HESS to the diffuse Galactic emission measured by EGRET and recently at higher energies by the Milagro Collaboration. Assuming that HESS sources have all the same intrinsic luminosity, the contribution of this new source population can account for most of the Milagro $\\gamma$-ray emission at TeV energies and between 10 and 20 per cent of EGRET diffuse Galactic $\\gamma$-ray emission for energies bigger than 10 GeV. Also, by combining the HESS and the Milagro results, constraints can be put on the distribution and the luminosities of gamma ray emitters in the Galaxy.

  20. Mechanisms of Sulfur Poisoning of NOx Adsorber (LNT) Materials

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

    Yezerets Cummins Inc. Hai-Ying Chen, Howard Hess Johnson Matthey 2 The project is a CRADA between PNNL and Cummins Inc. It involves a significant collaboration with catalyst...

  1. References and Notes 1. E. Roedder, Ed., Fluid Inclusions, vol. 12 of Reviews in

    E-Print Network [OSTI]

    Zhang, Guangyu

    . Mineral. Petrol. 102, 102 (1989). 8. D. B. Dingwell, K. U. Hess, C. Romano, Earth Planet. Sci. Lett. 158, D. Laporte, P. Schiano, Contrib. Mineral. Petrol. 148, 1 (2004). 31. P. Schiano et al., Earth Planet

  2. GEOPHYSICAL RESEARCH LETTERS, VOL. 28, NO. 24, PAGES 4631-4634, DECEMBER 15, 2001 Remote sensing of global wetland dynamics with

    E-Print Network [OSTI]

    Aires, Filipe

    and a linear mixture model with end-members calibrated with radar observations to account for vegetation cover-arid environments [Gumbricht et al., personal communication]. Synthetic aper- ture radar (SAR) studies [Hess et al

  3. UC Irvine Emergency Medicine Interest Group: Overcoming Barriers to Mentorship in Undergraduate Medical Education through Structured Mentorship Opportunities

    E-Print Network [OSTI]

    2011-01-01T23:59:59.000Z

    Journal of Emergency Medicine Zerzan J, Hess R, Schur E etfor Mentees. Academic Medicine 2009;84:140-4. Garahbaghianinterest in emergency medicine. JEM 2010;40:458-62. CAL/AAEM

  4. Contribution of unresolved point sources to the galactic diffuse emission

    E-Print Network [OSTI]

    Casanova, S; Casanova, Sabrina; Dingus, Brenda L.

    2006-01-01T23:59:59.000Z

    The detection by the HESS atmospheric Cherenkov telescope of fifteen new sources from the Galactic plane makes it possible to estimate the contribution of unresolved point sources like those detected by HESS to the diffuse Galactic emission measured by EGRET and recently at higher energies by the Milagro Collaboration. Assuming that HESS sources have all the same intrinsic luminosity, the contribution of this new source population can account for most of the Milagro $\\gamma$-ray emission at TeV energies and between 10 and 20 per cent of EGRET diffuse Galactic $\\gamma$-ray emission for energies bigger than 10 GeV. Also, by combining the HESS and the Milagro results, constraints can be put on the distribution and the luminosities of gamma ray emitters in the Galaxy.

  5. Microsoft Word - TM2012-003-0 35 dollar in TM format .docx

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

    Cellulose, 16:599-619. Hess, J.R., Wright C.T., Kenney K.L. 2007. Cellulosic Biomass Feedstocks and Logistics for Ethanol Production. Biofuels, Bioproducts and Biorefining,...

  6. BEE 5951 BEE 6970 1080 Ahner,Beth A. 1105 Ahner,Beth A.

    E-Print Network [OSTI]

    Walter, M.Todd

    BEE 5951 BEE 6970 1080 Ahner,Beth A. 1105 Ahner,Beth A. 1584 Albright,Louis D. 3104 Albright,Ashim K 3110 Gebremedhin,Kifle G. 1590 Gebremedhin,Kifle G. 4516 Geohring,Larry 1591 Haith,Douglas A. 3111 Haith,Douglas A. 1592 Hess,Peter 3112 Hess,Peter 1593 Hunter,Jean B. 3113 Hunter,Jean B. 1594 Luo

  7. Hanau licenses voided by German state court

    SciTech Connect (OSTI)

    Not Available

    1993-09-01T23:59:59.000Z

    On July 21, the Higher Administrative Court in the German state of Hesse declared illegal three of the first four partial construction licenses for the plutonium section of the Siemens fuel fabrication complex at Hanau. The licenses were issued in the late 1980s by the former Christian Democrat administration of Hesse, but final licensing of the plant - now 90 percent complete - has been held up by the Social Democrat/Green Party coalition government that is now in power. The court ruling came as a result of four cases, and a so-called urgent application, initiated by antinuclear groups in the area.

  8. The Astrophysical Multimessenger Observatory Network (AMON) M.W.E. Smith a,b,

    E-Print Network [OSTI]

    Babu, G. Jogesh

    Gravitational radiation Neutrinos Cosmic rays Gamma-ray bursts Supernovae a b s t r a c t We summarize including the Swift [6] and Fermi [7] satellites, the HESS [8], VERITAS [9], and MAGIC [10] TeV gamma-ray telescopes, and the HAWC [11] TeV gamma-ray observatory. Collectively, these facilities promise the first

  9. GCCC Students Hit the Road for the Summer Summer is around the corner, and GCCC students are taking advantage of the

    E-Print Network [OSTI]

    Texas at Austin, University of

    -monitoring networks above CO2-EOR sites. Ph.D. student K-Won Chang is heading much farther east than Houston. He plans of the CO2 plume at Cranfield using seismic surveys. This summer she's off to Houston, where she Development Group. Also headed to Houston, Marlo Gawey will be working on an EOR project with Hess Corporation

  10. THE ECONOMIC SITUATION IN THE ECE REGION

    E-Print Network [OSTI]

    THE ECONOMIC SITUATION IN THE ECE REGION DIETER HESSE ECONOMIC ANALYSIS DIVISION UNECE #12;Major trends in the global economy so far in 2003 Global economic activity picked up ­ but uneven regional growth forces United States remains main engine of global economic growth Japan and Asian emerging

  11. JOURNAL DE PHYSIQUE Colloque C3, suppldment au no 8, Tome 38, Aoiit 1977,page C3-165 RF HEATING EXPERIMENTS IN THE WEGA TOKAMAK

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    EXPERIMENTS IN THE WEGA TOKAMAK P. BLANC, W. HESS, G. ICHTCHENKO, P. LALLIA, T. K. NGUYEN, G. TONON plasma du Tokamak WEGA a l'aide de boucles plackes a I'intk- rieur de la chambre a vide. Des profils de. Abstract. -To the WEGA Tokamak plasma, up to 90 kW RF power near the lower hybrid fre- quency (500 MHz

  12. A Fundamental Study of Convective Mixing of CO2 in Heterogeneous Geologic Media using Surrogate Fluids and Numerical Modeling

    E-Print Network [OSTI]

    of formation heterogeneity on convective mixing. Finite volume based numerical code was developed to capture of Canadian Petroleum Technology, 44(10). - Neufeld, J. A., Hesse M. A., Riaz, A., Hallworth M. A., Tchelepi, H. A., and Huppert H. E., 2010, Convective dissolution of carbon dioxide in saline aquifers, Geophys

  13. GraftonCountyConservationDistrict PortableSkidderBridgeDemonstrationWorkshop

    E-Print Network [OSTI]

    New Hampshire, University of

    conservation services to protect, improve and sustain our natural resources. GRAFTON COUNTY CONSERVATION Finlay, District Conservationist Donna Doel, Soil Conservationist Mitch Hess, Soil Conservationist Jack and are a Best Management Practice for controlling non-point source pollution associated with timber harvest

  14. Special Issue: "Thinking beyond the Box: Designing Interactive TV across Different Devices"

    E-Print Network [OSTI]

    provides new opportunities for using home-related services including online gaming, visualization of energy" Behavior & Information Technology (BIT) Guest Editors: Jan Hess, Hendrik Knoche, Volker Wulf Nowadays consumption, home security or support for healthy living. The TV set is thus becoming a high-tech platform

  15. IEEE Benelux EMBS Symposium December 6-7, 2007 ON THE DEVELOPMENT OF A BRAIN-COMPUTER INTERFACE

    E-Print Network [OSTI]

    Heskes, Tom

    SYSTEM USING HIGH-DENSITY MAGNETOENCEPHALOGRAM SIGNALS FOR REAL-TIME CONTROL OF A ROBOT ARM C.W. Hesse 1 and a robot arm in a motor imagery paradigm. Computationally efficient spatial filtering and time- frequency in order to control a computer game and a robot arm in real-time. The system uses a multi-channel signal

  16. Running head: STEREOTYPE THREAT IN OLDER ADULTS 1 Stereotype threat can enhance, as well as impair, older adults' memory

    E-Print Network [OSTI]

    Mather, Mara

    Running head: STEREOTYPE THREAT IN OLDER ADULTS 1 Stereotype threat can enhance, as well as impair, and Rico Velasco for research assistance and to Dr. Tom Hess for providing us with the stereotype threat for publication. #12;STEREOTYPE THREAT IN OLDER ADULTS 2 Abstract (150) Negative stereotypes about aging can

  17. Generalising the GHS Attack on the Elliptic Curve Discrete Logarithm Problem

    E-Print Network [OSTI]

    Hess, Florian

    Generalising the GHS Attack on the Elliptic Curve Discrete Logarithm Problem F. Hess Technical succumb to the basic GHS attack, thereby weakening curves over F2155 further. We also discuss other possible extensions or variations of the GHS attack and conclude that they are not likely to yield further

  18. The GHS Attack Revisited Computer Science Department,

    E-Print Network [OSTI]

    Hess, Florian

    The GHS Attack Revisited F. Hess Computer Science Department, Woodland Road, University of Bristol the number of elliptic curves which succumb to the basic GHS attack, thereby weakening curves over F2155 further. We also discuss other possible extensions or variations of the GHS attack and conclude

  19. Extending the GHS Weil Descent Attack No Author Given

    E-Print Network [OSTI]

    Hess, Florian

    Extending the GHS Weil Descent Attack No Author Given No Institute Given Abstract. In this paper we extend the Weil descent attack due to Gaudry, Hess and Smart (GHS) to a much larger class of elliptic curves. This extended attack applies to elds of composite degree over F2 . The principle behind

  20. Analysis of the GHS Weil Descent Attack on the ECDLP over Characteristic Two Finite Fields of Composite Degree

    E-Print Network [OSTI]

    Teske, Edlyn

    Analysis of the GHS Weil Descent Attack on the ECDLP over Characteristic Two Finite Fields, we analyze the Gaudry-Hess-Smart (GHS) Weil descent attack on the elliptic curve discrete logarithm with these parameters; and (ii) the GHS attack is more eÃ?cient for solving the ECDLP in E(F 2 N ) than for solving

  1. DOI: 10.1126/science.1175750 , 1658 (2009);325Science

    E-Print Network [OSTI]

    Schrag, Daniel

    2009-01-01T23:59:59.000Z

    nonfossil fuel sources, including renewable and nuclear energy; and investment in adaptation to reduce. Stamp, Environ. Geol. 54, 1667 (2008). 10. A. Riaz, M. Hesse, H. Tchelepi, F. M. Orr Jr., J. Fluid Mech% of the world's energy coming from fossil fuel, winning the battle also requires capturing CO2 from large

  2. PNC-CAT

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

    study of a model crumpled membrane G.T. Seidler, E. Behne, L.J. Atkins, and A. Rendahl X-ray probes of the uptake of metal ions by CaCO3 K.M. Beck, S.M. Heald, and W.P. Hess...

  3. Short Communication Effect of exogenous electron shuttles on growth and fermentative metabolism

    E-Print Network [OSTI]

    Johnson, Peter D.

    Research Centre, Kalpakkam 603102, Tamil Nadu, India c Division of Advanced Nuclear Engineering, POSTECH of ESs can cre- ate alternate electron flows, thereby affecting the fermentation pattern and biofuel are of special interest in biofuel production from lignocellu- losic biomass (Hess et al., 2011) due

  4. Original article Soil CO2 efflux in a beech forest: dependence on soil

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Original article Soil CO2 efflux in a beech forest: dependence on soil temperature and soil water 1998) Abstract - Our objective was to quantify the annual soil carbon efflux in a young beech forest in north-eastern France (Hesse Forest, Euroflux site FR02) from measurements of soil CO, efflux. Soil CO

  5. Your Career as Alumni Student Careers Forum

    E-Print Network [OSTI]

    Militzer, Burkhard

    Anode Plant Oak Ridge Reservation Bulgarian Wireless Network Khursaniyah Gas Plant Jamnagar Refinery Mountain Repository Refinery KG D6 Gas Development Thai Oil Paraxylene 4G Communications High Speed 1Hess Gas Development Motiva Refinery Yarwun 2 Refinery #12;10/23/2008 4 Rock Anchoring A di P j t Alumni

  6. Snake River Fall Chinook Salmon Productivity Nez Perce Tribe

    E-Print Network [OSTI]

    Snake River Fall Chinook Salmon Productivity Jay Hesse Nez Perce Tribe Department of Fisheries salmon abundance and productivity have been and continue to be influenced by construction and operation related to productivity; (1) adult abundance, (2) hatchery programs, (3) management actions, and (4

  7. No. 16 ISSN 10278389 March 2012 The Southern African Large Telescope (Courtesy: S.B. Potter)

    E-Print Network [OSTI]

    Jarrett, Thomas H.

    @aol.com P.M. Okouma Gabon okouma@hotmail.com A.I. Ibrahim Egypt alaa@milkyway.gsfc.nasa.gov L. Kebede-East and Africa. In partic- ular, the completion of HESS (the High Energy Stereoscopic System, in Namibia-class observational capability from ultra-high energy gamma-rays, through optical/near-IR to radio wave- lengths

  8. SEMINAR SERIES Towards a climate sensitive

    E-Print Network [OSTI]

    in an Earth System Model presented by Peter Hess Associate Professor, Biological and Environmental Engineering are crudely represented in Earth System Models and do not respond changes in climate. Here I present a first interactive parameterization of ammonia emissions in an Earth System Model based on model physics and discuss

  9. Particle Size Distribution of Gypseous Samples

    E-Print Network [OSTI]

    Arnett, Morgan P.

    2010-01-16T23:59:59.000Z

    to conditions in the field. In order to understand the true characterization of the soil and the gypsum particles, the entire soil sample should be analyzed. Four different approaches to the BaCl2 method presented in the literature (Hesse, 1976, Matar...

  10. The Status and Need for Plant Biotechnology Education in Texas Secondary Agricultural Curriculum

    E-Print Network [OSTI]

    Sprouse, Ian Richard

    2013-09-24T23:59:59.000Z

    of contention: world hunger and the global controversy over GM crops. Johns Hopkins University Press. Priest, S. H. (2000). US public opinion divided over biotechnology?. Nature biotechnology, 18(9), 939-942. Trexler, C. J., Hess, A. J., & Hayes, K. N...

  11. State of the Art of Artificial Intelligence and Predictive Analytics in the E&P Industry: A Technology Survey

    E-Print Network [OSTI]

    Mohaghegh, Shahab

    related to several E&P operations and service companies is presented. This survey captures the level of AI: A Technology Survey César Bravo, Halliburton; Luigi Saputelli, Hess Corporation; Francklin Rivas and Anna and pilot projects. In this work, an analysis of a survey conducted on a broad group of professionals

  12. ICRC 2007: Mrida, Mexico Highlights from the Pierre Auger Observatory

    E-Print Network [OSTI]

    and side-by- side." V.H.Hess, Nobel Lecture, December 1936 #12;2 Argentina Australia Brasil Bolivia* Mexico (stereo ­ low N) ~ 0.2° ~ 1 - 2° ~ 3 - 5° Flat with energy AND E, A, spectral mass and model (M) free slope and M dependent A and M free A and M A and M free dependent Angular Resolution Aperture Energy #12

  13. Very-High Energy Gamma-Ray Flux Limits for Nearby Active Galactic Nuclei

    E-Print Network [OSTI]

    T. Herr; W. Hofmann; for the H. E. S. S. Collaboration

    2008-11-18T23:59:59.000Z

    Combining the results of targeted observations, H.E.S.S. has accumulated a large amount of extra-galactic exposure at TeV energies. Due to its large field of view a considerable part of the sky (0.6 sr) has been observed with high sensitivity outside the targeted observation positions. Since this exposure region contains little inherent bias, it is well suited for studies of extra-galactic source populations. Given the correlation between ultra-high energy cosmic rays and nearby extra-galactic objects recently claimed by the Auger collaboration, this unbiased sky sample by H.E.S.S. is of interest since it includes (besides the targeted sources) 63 AGN within 100 Mpc, for which very-high energy gamma-ray flux limits are derived.

  14. Hybrid model of GeV-TeV gamma ray emission from Galactic Center

    E-Print Network [OSTI]

    Yi-Qing Guo; Qiang Yuan; Cheng Liu; Ai-Feng Li

    2014-09-14T23:59:59.000Z

    The observations of high energy $\\gamma$-ray emission from the Galactic center (GC) by HESS, and recently by Fermi, suggest the cosmic ray acceleration in the GC and possibly around the supermassive black hole. In this work we propose a lepton-hadron hybrid model to explain simultaneously the GeV-TeV $\\gamma$-ray emission. Both electrons and hadronic cosmic rays were accelerated during the past activity of the GC. Then these particles would diffuse outwards and interact with the interstellar gas and background radiation field. The collisions between hadronic cosmic rays with gas is responsible to the TeV $\\gamma$-ray emission detected by HESS. With fast cooling in the strong radiation field, the electrons would cool down and radiate GeV photons through inverse Compton scattering off the soft background photons. This scenario provides a natural explanation of the observed GeV-TeV spectral shape of $\\gamma$-rays.

  15. Electrographic correlates of sleep behavior in a primitive mammal, the armadillo Dasypus novemcinctus

    E-Print Network [OSTI]

    Prudom, Albert Edward

    1974-01-01T23:59:59.000Z

    of Sleep Modern Studies of Sleep Mechanisms Chemical Studies Electrical Stimulation Studies PS Induction Studies Biological Role of Sleep Sleep in General Paradoxical Sleep Phylogenetic Relations METHODS 1 3 3 4 5 8 9 9 12 15 21... it is acti- vated. For example, electric stimulation of the DTPS of a relaxed animal can induce sleep (Hess et al. , 19&3). Modern Studies Of Sleep Mechanisms Two basic approaches have been employed in attempting to map the particular brain areas...

  16. Von Ungarn nach Auschwitz: Die verschwiegene Warnung.

    E-Print Network [OSTI]

    Baron, Frank; Szenes, Sá ndor

    2010-10-19T23:59:59.000Z

    Works in “Von Ungarn nach Auschwitz: Die verschwiegene Warnung” at http://hdl.handle.net/1808/6817. An English translation of the Vrba-Wetzler report may be found at http://www.holocaustresearchproject.org/othercamps/auschproto.html See also: "The ‘Myth... s , Rilke, Hesse, Thomas Ma nn, Alber t Bloch und zur unga r i s c h e n Literatu rg esch ich te. Sándor Szenes und Frank Baron Von Ungarn nach Auschwitz Die verschwiegene Warnung...

  17. Crossdressing Cinema: An Analysis of Transgender Representation in Film

    E-Print Network [OSTI]

    Miller, Jeremy Russell

    2012-10-19T23:59:59.000Z

    Lozano-Whitten, Masha Sukovic, Vandy Ramadurai, Betsy McCann, Joëlle Cruz, Shelly Blair, Donathan Brown, Anirban Mukhopadhyay, Xi Cui, Trijya Singh, Marrisa Doshi, Lea Hernandez, Isaac Holyoak, Brynn Fitzpatrick, Dan De Leon, Zoe Hess Carney, Rachel... Rashe Reed, Rachel Romero, Jeremy Rogerson, Kevin Cosgriff-Hernandez, and Rachael Hernandez, and faculty members, Srivi Ramasubramanian, Patrick Burkart, Antonio La Pastina, J. Kevin Barge, Jennifer Mease, Rebecca Gill, Tom Frentz, Frank Scheide...

  18. The development and operational testing of an experimental reactor for gas-liquid-solid reaction systems at high temperatures and pressures

    E-Print Network [OSTI]

    Hess, Richard Kenneth

    1985-01-01T23:59:59.000Z

    THE DEVELOPMENT AND OPERATIONAL TESTING OF AN EXPERIMENTAL REACTOR FOR GAS-LIQUID-SOLID REACTION SYSTEMS AT HIGH TEMPERATURES AND PRESSURES A Thesis by RICHARD KENNETH HESS Submitted to the Graduate College of Texas A&M University in partial... fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1985 Major Subject: Chemical Engineering THE DEVELOPMENT AND OPERATIONAL TESTING OF AN EXPERIMENTAL REACTOR FOR GAS-LIQUID-SOLID REACTION SYSTEMS AT HIGH TEMPERATURES...

  19. 'R. S. Pound, M. A. Saifi, W. C. Hahn, Jr., Solid-State Electron. 17, 245 2S. Margalit, D. Fekete, D. M. Pepper, c.-P. Lee, and A. Yariv, Appl.

    E-Print Network [OSTI]

    Woodall, Jerry M.

    . Fekete, D. M. Pepper, c.-P. Lee, and A. Yariv, Appl. Phys. Lett. 33, 346 (1978). 'R. B. Gold, R. A'R. S. Pound, M. A. Saifi, W. C. Hahn, Jr., Solid-State Electron. 17, 245 (1974). 2S. Margalit, D. D. Hess, C. F. Krum, Ref. 3, p. 641. 5p. A. Barnes, H. J. Leamy, J. M. Poate, and G. K. Celler

  20. New developments in special geometry

    E-Print Network [OSTI]

    Thomas Mohaupt

    2006-02-17T23:59:59.000Z

    We review recent developments in special geometry, emphasizing the role of real coordinates. In the first part we discuss the para-complex geometry of vector and hypermultiplets in rigid Euclidean N=2 supersymmetry. In the second part we study the variational principle governing the near horizon limit of BPS black holes in matter-coupled N=2 supergravity and observe that the black hole entropy is the Legendre transform of the Hesse potential encoding the geometry of the scalar fields.

  1. Dark matter annihilation and the PAMELA, FERMI, and ATIC anomalies

    SciTech Connect (OSTI)

    El Zant, A. A.; Okada, H. [Centre for Theoretical Physics, British University in Egypt, El Sherouk City, Postal No, 11837, Post Office Box 43 (Egypt); Khalil, S. [Centre for Theoretical Physics, British University in Egypt, El Sherouk City, Postal No, 11837, Post Office Box 43 (Egypt); Department of Mathematics, Ain Shams University, Faculty of Science, Cairo, 11566 (Egypt)

    2010-06-15T23:59:59.000Z

    If dark matter annihilation accounts for the tantalizing excess of cosmic ray electron/positrons, as reported by the PAMELA, ATIC, HESS, and FERMI observatories, then the implied annihilation cross section must be relatively large. This results, in the context of standard cosmological models, in very small relic dark matter abundances that are incompatible with astrophysical observations. We explore possible resolutions to this apparent conflict in terms of nonstandard cosmological scenarios; plausibly allowing for large cross sections, while maintaining relic abundances in accord with current observations.

  2. Hestiun Limited | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural Gas and Elec.

  3. Hex Brasil Industrias Eletronicas Ltda | Open Energy Information

    Open Energy Info (EERE)

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  4. Hi Bond Tapes Ltd | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural Gas and Elec.Hex

  5. Hi FRED Team! Welcome to our community area | OpenEI Community

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural Gas and Elec.HexHi FRED

  6. Hi Spec Research Developments Ltd | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural Gas and Elec.HexHi

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    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural Gas and

  8. Hickman-Fulton Counties RECC | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural Gas andHickman-Fulton

  9. Hidrelectrica Cachoeirao S A | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural Gas

  10. Hidrelectrica Pipoca S A | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural GasHidrelectrica Pipoca

  11. Hidroelectrica Chupinguaia Ltda | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural GasHidrelectrica

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    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail Natural

  13. Hiflux Ltd | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail NaturalHiflux Ltd Jump to:

  14. High Energy Batteries India Ltd | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail NaturalHiflux Ltd Jump to:High

  15. High Performance Commercial Buildings Technology Roadmap | Open Energy

    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail NaturalHiflux Ltd Jump

  16. High Plains Bioenergy | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail NaturalHiflux Ltd JumpPlains

  17. High Plains Power Inc | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail NaturalHiflux Ltd

  18. High Techno Crates Private Limited | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail NaturalHiflux LtdTechno Crates

  19. High West Energy, Inc (Wyoming) | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail NaturalHiflux LtdTechno

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  1. Highlight Tech Corp HTC | Open Energy Information

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    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail NaturalHiflux

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    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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual SiteofEvaluatingGroup | Open EnergyInformation Hess Retail NaturalHifluxHighline Electric

  3. Hightex | Open Energy Information

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  7. Hilti Corporation | Open Energy Information

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  8. Him Kailash Hydro Power P Ltd | Open Energy Information

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  9. Himachal Pradesh State Electricity Board HPSEB | Open Energy Information

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  10. Himachal Sorang Power Pvt Ltd HSPPL | Open Energy Information

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  11. Himalayan Crest Power Pvt Ltd | Open Energy Information

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  12. Himalayan Hydro P Ltd | Open Energy Information

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  13. Himpower Associates Pvt Ltd | Open Energy Information

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  14. Hind High Vacuum Company Private Ltd | Open Energy Information

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  15. Hindustan Petroleum Shree Renuka Sugars JV | Open Energy Information

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  16. Hinesburg, Vermont: Energy Resources | Open Energy Information

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  17. Hinson Power Company LLC | Open Energy Information

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  18. Hiolle Energies | Open Energy Information

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  19. Hirano Tecseed Co Ltd | Open Energy Information

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  20. Hiraoka Co Ltd | Open Energy Information

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  1. Hirschmann Automation and Control GmbH | Open Energy Information

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  2. Historic utility retail rate information | OpenEI Community

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  3. Hitec Power Protection | Open Energy Information

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  4. Hochtief | Open Energy Information

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  5. Hocking College Energy Institute | Open Energy Information

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  6. Hoku Scientific Inc | Open Energy Information

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  7. Holland, Michigan: Energy Resources | Open Energy Information

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  8. Holmes-Wayne Electric Coop Inc | Open Energy Information

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  9. Holy Technology Corporation | Open Energy Information

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  10. Home Energy Saver | Open Energy Information

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  11. Home Energy Scoring Tool | Open Energy Information

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  12. Home | OpenEI Community

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  13. Homer Electric Assn Inc | Open Energy Information

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  14. Homestead Inc | Open Energy Information

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  15. Honduras-Low-Carbon Energy for Central America: Building a Regional Model |

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  16. Honduras: Energy Resources | Open Energy Information

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  17. Hong Kong Highpower Technology Inc | Open Energy Information

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  18. Hong Kong: Energy Resources | Open Energy Information

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  19. Hongsheng Optoelections | Open Energy Information

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  20. Hongyuan Hydropower Development Co Ltd | Open Energy Information

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  1. Hood River Electric Coop | Open Energy Information

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  2. Hoogen Bioenergie GmbH Co KG | Open Energy Information

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  3. Hoosier Energy R E C, Inc | Open Energy Information

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  4. A Gamma-Ray Burst/Pulsar for Cosmic-Ray Positrons with a Dark Matter-like Spectrum

    E-Print Network [OSTI]

    Kunihito Ioka

    2010-06-15T23:59:59.000Z

    We propose that a nearby gamma-ray burst (GRB) or GRB-like (old, single and short-lived) pulsar/supernova remnant/microquasar about 10^{5-6} years ago may be responsible for the excesses of cosmic-ray positrons and electrons recently observed by the PAMELA, ATIC/PPB-BETS, Fermi and HESS experiments. We can reproduce the smooth Fermi/HESS spectra as well as the spiky ATIC/PPB-BETS spectra. The spectra have a sharp cutoff that is similar to the dark matter predictions, sometimes together with a line (not similar), since higher energy cosmic-rays cool faster where the cutoff/line energy marks the source age. A GRB-like astrophysical source is expected to have a small but finite spread in the cutoff/line as well as anisotropy in the cosmic-ray and diffuse gamma-ray flux, providing a method for the Fermi and future CALET experiments to discriminate between dark matter and astrophysical origins.

  5. The exceptionally powerful TeV gamma-ray emitters in the Large Magellanic Cloud

    E-Print Network [OSTI]

    :,; Aharonian, F; Benkhali, F Ait; Akhperjanian, A G; Angüner, E O; Backes, M; Balenderan, S; Balzer, A; Barnacka, A; Becherini, Y; Becker-Tjus, J; Berge, D; Bernhard, S; Bernlöhr, K; Birsin, E; Biteau, J; Böttcher, M; Boisson, C; Bolmont, J; Bordas, P; Bregeon, J; Brun, F; Brun, P; Bryan, M; Bulik, T; Carrigan, S; Casanova, S; Chadwick, P M; Chakraborty, N; Chalme-Calvet, R; Chaves, R C G; Chrétien, M; Colafrancesco, S; Cologna, G; Conrad, J; Couturier, C; Cui, Y; Dalton, M; Davids, I D; Degrange, B; Deil, C; de Wilt, P; Djannati-Ataï, A; Domainko, W; Donath, A; Drury, L O'C; Dubus, G; Dutson, K; Dyks, J; Dyrda, M; Edwards, T; Egberts, K; Eger, P; Espigat, P; Farnier, C; Fegan, S; Feinstein, F; Fernandes, M V; Fernandez, D; Fiasson, A; Fontaine, G; Förster, A; ling, M Füß; Gabici, S; Gajdus, M; Gallant, Y A; Garrigoux, T; Giavitto, G; Giebels, B; Glicenstein, J F; Gottschall, D; Grondin, M -H; Grudzi?ska, M; Hadasch, D; Häffner, S; Hahn, J; Harris, J; Heinzelmann, G; Henri, G; Hermann, G; Hervet, O; Hillert, A; Hinton, J A; Hofmann, W; Hofverberg, P; Holler, M; Horns, D; Ivascenko, A; Jacholkowska, A; Jahn, C; Jamrozy, M; Janiak, M; Jankowsky, F; Jung, I; Kastendieck, M A; Katarzy?ski, K; Katz, U; Kaufmann, S; Khélifi, B; Kieffer, M; Klepser, S; Klochkov, D; Klu?niak, W; Kolitzus, D; Komin, Nu; Kosack, K; Krakau, S; Krayzel, F; Krüger, P P; Laffon, H; Lamanna, G; Lefaucheur, J; Lefranc, V; Lemière, A; Lemoine-Goumard, M; Lenain, J -P; Lohse, T; Lopatin, A; Lu, C -C; Marandon, V; Marcowith, A; Marx, R; Maurin, G; Maxted, N; Mayer, M; McComb, T J L; Méhault, J; Meintjes, P J; Menzler, U; Meyer, M; Mitchell, A M W; Moderski, R; Mohamed, M; Morå, K; Moulin, E; Murach, T; de Naurois, M; Niemiec, J; Nolan, S J; Oakes, L; Odaka, H; Ohm, S; Opitz, B; Ostrowski, M; Oya, I; Panter, M; Parsons, R D; Arribas, M Paz; Pekeur, N W; Pelletier, G; Perez, J; Petrucci, P -O; Peyaud, B; Pita, S; Poon, H; Pühlhofer, G; Punch, M; Quirrenbach, A; Raab, S; Reichardt, I; Reimer, A; Reimer, O; Renaud, M; Reyes, R de los; Rieger, F; Rob, L; Romoli, C; Rosier-Lees, S; Rowell, G; Rudak, B; Sahakian, C B Rulten V; Salek, D; Sanchez, D A; Santangelo, A; Schlickeiser, R; Schüssler, F; Schulz, A; Schwanke, U; Schwarzburg, S; Schwemmer, S; Sol, H; Spanier, F; Spengler, G; Spies, F; Stawarz, ?; Steenkamp, R; Stegmann, C; Stinzing, F; Stycz, K; Sushch, I; Tavernet, J -P; Tavernier, T; Taylor, A M; Terrier, R; Tluczykont, M; Trichard, C; Valerius, K; van Eldik, C; van Soelen, B; Vasileiadis, G; Veh, J; Venter, C; Viana, A; Vincent, P; Vink, J; Völk, H J; Volpe, F; Vorster, M; Vuillaume, T; Wagner, S J; Wagner, P; Wagner, R M; Ward, M; Weidinger, M; Weitzel, Q; White, R; Wierzcholska, A; Willmann, P; Wörnlein, A; Wouters, D; Yang, R; Zabalza, V; Zaborov, D; Zacharias, M; Zdziarski, A A; Zech, A; Zechlin, H -S

    2015-01-01T23:59:59.000Z

    The Large Magellanic Cloud, a satellite galaxy of the Milky Way, has been observed with the High Energy Stereoscopic System (H.E.S.S.) above an energy of 100 billion electron volts for a deep exposure of 210 hours. Three sources of different types were detected: the pulsar wind nebula of the most energetic pulsar known N 157B, the radio-loud supernova remnant N 132D and the largest non-thermal X-ray shell - the superbubble 30 Dor C. The unique object SN 1987A is, surprisingly, not detected, which constrains the theoretical framework of particle acceleration in very young supernova remnants. These detections reveal the most energetic tip of a gamma-ray source population in an external galaxy, and provide via 30 Dor C the unambiguous detection of gamma-ray emission from a superbubble.

  6. Collective effects of stellar winds and unidentified gamma-ray sources

    E-Print Network [OSTI]

    Diego F. Torres; Eva Domingo-Santamaria

    2006-11-11T23:59:59.000Z

    We study collective wind configurations produced by a number of massive stars, and obtain densities and expansion velocities of the stellar wind gas that is to be target, in this model, of hadronic interactions. We study the expected $\\gamma$-ray emission from these regions, considering in an approximate way the effect of cosmic ray modulation. We compute secondary particle production (electrons from knock-on interactions and electrons and positrons from charged pion decay), and solve the loss equation with ionization, synchrotron, bremsstrahlung, inverse Compton, and expansion losses. We provide examples where configurations can produce sources for GLAST satellite, and the MAGIC, HESS, or VERITAS telescopes in non-uniform ways, i.e., with or without the corresponding counterparts. We show that in all cases we studied no EGRET source is expected.

  7. Very-High-Energy Gamma-Ray Signal from Nuclear Photodisintegration as a Probe of Extragalactic Sources of Ultrahigh-Energy Nuclei

    E-Print Network [OSTI]

    Kohta Murase; John F. Beacom

    2010-07-29T23:59:59.000Z

    It is crucial to identify the ultrahigh-energy cosmic-ray (UHECR) sources and probe their unknown properties. Recent results from the Pierre Auger Observatory favor a heavy nuclear composition for the UHECRs. Under the requirement that heavy nuclei survive in these sources, using gamma-ray bursts as an example, we predict a diagnostic gamma-ray signal, unique to nuclei - the emission of de-excitation gamma rays following photodisintegration. These gamma rays, boosted from MeV to TeV-PeV energies, may be detectable by gamma-ray telescopes such as VERITAS, HESS, and MAGIC, and especially the next-generation CTA and AGIS. They are a promising messenger to identify and study individual UHE nuclei accelerators.

  8. VHE gamma-rays from Westerlund 2 and implications for the inferred energetics

    E-Print Network [OSTI]

    O. Reimer; F. Aharonian; J. Hinton; W. Hofmann; S. Hoppe; M. Raue; A. Reimer

    2007-10-18T23:59:59.000Z

    The H.E.S.S. collaboration recently reported the discovery of VHE gamma-ray emission coincident with the young stellar cluster Westerlund 2. This system is known to host a population of hot, massive stars, and, most particularly, the WR binary WR20a. Particle acceleration to TeV energies in Westerlund 2 can be accomplished in several alternative scenarios, therefore we only discuss energetic constraints based on the total available kinetic energy in the system, the actual mass loss rates of respective cluster members, and implied gamma-ray production from processes such as inverse Compton scattering or neutral pion decay. From the inferred gamma-ray luminosity of the order of 10^35 erg/s, implications for the efficiency of converting available kinetic energy into non-thermal radiation associated with stellar winds in the Westerlund 2 cluster are discussed under consideration of either the presence or absence of wind clumping.

  9. Millisecond pulsar population in the Galactic center and high energy contributions

    E-Print Network [OSTI]

    W. Wang

    2005-10-15T23:59:59.000Z

    We propose that there possibly exists a population of millisecond pulsars in the Galactic center region. Millisecond pulsars (MSPs) could emit GeV gamma-rays through synchrotron-curvature radiation as predicted by outer gap models. In the same time, the compact wind nebulae around millisecond pulsars can emit X-rays though synchrotron radiation and TeV photons through inverse Compton processes. Besides, millisecond pulsar winds provide good candidates for the electron-positrons sources in the Galactic center. Therefore, we suggest that the millisecond pulsar population could contribute to the weak unidentified Chandra X-ray sources, the diffuse gamma-rays detected by EGRET, electron-positron annihilation lines and TeV photons detected by HESS toward the Galactic center.

  10. Belowground Carbon Cycling Processes at the Molecular Scale: An EMSL Science Theme Advisory Panel Workshop

    SciTech Connect (OSTI)

    Hess, Nancy J.; Brown, Gordon E.; Plata, Charity

    2014-02-21T23:59:59.000Z

    As part of the Belowground Carbon Cycling Processes at the Molecular Scale workshop, an EMSL Science Theme Advisory Panel meeting held in February 2013, attendees discussed critical biogeochemical processes that regulate carbon cycling in soil. The meeting attendees determined that as a national scientific user facility, EMSL can provide the tools and expertise needed to elucidate the molecular foundation that underlies mechanistic descriptions of biogeochemical processes that control carbon allocation and fluxes at the terrestrial/atmospheric interface in landscape and regional climate models. Consequently, the workshop's goal was to identify the science gaps that hinder either development of mechanistic description of critical processes or their accurate representation in climate models. In part, this report offers recommendations for future EMSL activities in this research area. The workshop was co-chaired by Dr. Nancy Hess (EMSL) and Dr. Gordon Brown (Stanford University).

  11. An economic study of the grain sorghum industry

    E-Print Network [OSTI]

    Williamson, Marion Newton

    1939-01-01T23:59:59.000Z

    ~ This 51?sp is has?a os haelillge xa these sea?trios they aro kskportaat articles of hosea 41st, as& fee4s fer it@est?eh as4 pealtryo Ivory portico ef tho pl?lit ie ?sod is e~ %aye 5 The first pmsaseat iaire4?otiose of 5saia s?r&hess is tho Celt?4 St.... Dicdcsoa& Oraia ~aalu&uae Versus ~ra pbr ctteaicN Lambs ~ 884, ~ ~oxXse~ae 4Ioxas ~~eu terai Sapor i~en Statiou, Bullotia No. 599, p. 8, April, 1988. Naa. & pp. 8-9. 0 %. Sarburtoa, ~ Soa-~~her 8e ~ger n~as Uaited States De~i o! Agriculture, Parasrs Bu...

  12. TenTen: A New Array of Multi-TeV Imaging Cherenkov Telescopes

    E-Print Network [OSTI]

    G. Rowell; V. Stamatescu; R. Clay; B. Dawson; J. Denman; R. Protheroe; A. G. K. Smith; G. Thornton; N. Wild

    2007-10-10T23:59:59.000Z

    The exciting results from H.E.S.S. point to a new population of gamma-ray sources at energies E > 10 TeV, paving the way for future studies and new discoveries in the multi-TeV energy range. Connected with these energies is the search for sources of PeV cosmic-rays (CRs) and the study of multi-TeV gamma-ray production in a growing number of astrophysical environments. TenTen is a proposed stereoscopic array (with a suggested site in Australia) of modest-sized (10 to 30m^2) Cherenkov imaging telescopes with a wide field of view (8 to 10deg diameter) optimised for the E~10 to 100 TeV range. TenTen will achieve an effective area of ~10 km^2 at energies above 10 TeV. We outline here the motivation for TenTen and summarise key performance parameters.

  13. Simulation of Imaging Atmospheric Cherenkov Telescopes with CORSIKA and sim_telarray

    E-Print Network [OSTI]

    Konrad Bernlohr

    2008-08-16T23:59:59.000Z

    Imaging Atmospheric Cherenkov Telescopes (IACTs) have resulted in a breakthrough in very-high energy (VHE) gamma-ray astrophysics. While early IACT installations faced the problem of detecting any sources at all, current instruments are able to see many sources, often over more than two orders of magnitude in energy. As instruments and analysis methods have matured, the requirements for calibration and modelling of physical and instrumental effects have increased. In this article, a set of Monte Carlo simulation tools is described that attempts to include all relevant effects for IACTs in great detail but aims to achieve this in an efficient and flexible way. These tools were originally developed for the HEGRA IACT system and later adapted for the H.E.S.S. experiment. Their inherent flexibility to describe quite arbitrary IACT systems makes them also an ideal tool for evaluating the potential of future installations. It is in use for design studies of CTA and other projects.

  14. Q-branch Raman scattering and modern kinetic thoery

    SciTech Connect (OSTI)

    Monchick, L. [The Johns Hopkins Univ., Laurel, MD (United States)

    1993-12-01T23:59:59.000Z

    The program is an extension of previous APL work whose general aim was to calculate line shapes of nearly resonant isolated line transitions with solutions of a popular quantum kinetic equation-the Waldmann-Snider equation-using well known advanced solution techniques developed for the classical Boltzmann equation. The advanced techniques explored have been a BGK type approximation, which is termed the Generalized Hess Method (GHM), and conversion of the collision operator to a block diagonal matrix of symmetric collision kernels which then can be approximated by discrete ordinate methods. The latter method, which is termed the Collision Kernel method (CC), is capable of the highest accuracy and has been used quite successfully for Q-branch Raman scattering. The GHM method, not quite as accurate, is applicable over a wider range of pressures and has proven quite useful.

  15. X-RAY OBSERVATIONS OF THE NEW UNUSUAL MAGNETAR SWIFT J1834.9-0846

    SciTech Connect (OSTI)

    Kargaltsev, Oleg [Department of Astronomy, Bryant Space Science Center, University of Florida, Gainesville, FL 32611 (United States); Kouveliotou, Chryssa; Younes, George [Science and Technology Office, ZP12, NASA/Marshall Space Flight Center, Huntsville, AL 35812 (United States); Pavlov, George G. [Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802 (United States); Goegues, Ersin; Lin, Lin; Kaneko, Yuki [Faculty of Engineering and Natural Sciences, Sabanc Latin-Small-Letter-Dotless-I University, Orhanl Latin-Small-Letter-Dotless-I -Tuzla, Istanbul 34956 (Turkey); Wachter, Stefanie; Griffith, Roger L., E-mail: oyk100@astro.ufl.edu [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States)

    2012-03-20T23:59:59.000Z

    We present X-ray observations of the new transient magnetar Swift J1834.9-0846, discovered with the Swift Burst Alert Telescope on 2011 August 7. The data were obtained with Swift, Rossi X-ray Timing Explorer (RXTE), CXO, and XMM-Newton both before and after the outburst. Timing analysis reveals single peak pulsations with a period of 2.4823 s and an unusually high pulsed fraction, 85% {+-} 10%. Using the RXTE and CXO data, we estimated the period derivative, P-dot =8 Multiplication-Sign 10{sup -12} s s{sup -1}, and confirmed the high magnetic field of the source, B = 1.4 Multiplication-Sign 10{sup 14} G. The decay of the persistent X-ray flux, spanning 48 days, is consistent with a power law, F{proportional_to}t{sup -0.5}. In the CXO/Advanced CCD Imaging Spectrometer image, we find that the highly absorbed point source is surrounded by extended emission, which most likely is a dust scattering halo. Swift J1834.9-0846 is located near the center of the radio supernova remnant W41 and TeV source HESS J1834-087. An association with W41 would imply a source distance of about 4 kpc; however, any relation to the HESS source remains unclear, given the presence of several other candidate counterparts for the latter source in the field. Our search for an IR counterpart of Swift J1834.9-0846 revealed no source down to K{sub s} {approx} 19.5 within the 0.''6 CXO error circle.

  16. Gamma-ray boxes from axion-mediated dark matter

    SciTech Connect (OSTI)

    Ibarra, Alejandro; Gehler, Sergio López; Pato, Miguel [Physik-Department T30d, Technische Universität München, James-Franck-Strasse, 85748 Garching (Germany); Lee, Hyun Min; Park, Wan-Il, E-mail: ibarra@tum.de, E-mail: hyun.min.lee@cern.ch, E-mail: sergio.lopez@ph.tum.de, E-mail: wipark@kias.re.kr, E-mail: miguel.pato@tum.de [School of Physics, KIAS, Seoul 130-722 (Korea, Republic of)

    2013-05-01T23:59:59.000Z

    We compute the gamma-ray output of axion-mediated dark matter and derive the corresponding constraints set by recent data. In such scenarios the dark matter candidate is a Dirac fermion that pair-annihilates into axions and/or scalars. Provided that the axion decays (at least partly) into photons, these models naturally give rise to a box-shaped gamma-ray spectrum that may present two distinct phenomenological behaviours: a narrow box, resembling a line at half the dark matter mass, or a wide box, spanning an extensive energy range up to the dark matter mass. Remarkably, we find that in both cases a sizable gamma-ray flux is predicted for a thermal relic without fine-tuning the model parameters nor invoking boost factors. This large output is in line with recent Fermi-LAT observations towards the galactic centre region and is on the verge of being excluded. We then make use of the Fermi-LAT and H.E.S.S. data to derive robust, model-independent upper limits on the dark matter annihilation cross section for the narrow and wide box scenarios. H.E.S.S. constraints, in particular, turn out to match the ones from Fermi-LAT at hundreds of GeV and extend to multi-TeV masses. Future ?erenkov telescopes will likely probe gamma-ray boxes from thermal dark matter relics in the whole multi-TeV range, a region hardly accessible to direct detection, collider searches and other indirect detection strategies.

  17. ARRA-Multi-Level Energy Storage and Controls for Large-Scale Wind Energy Integration

    SciTech Connect (OSTI)

    David Wenzhong Gao

    2012-09-30T23:59:59.000Z

    The Project Objective is to design innovative energy storage architecture and associated controls for high wind penetration to increase reliability and market acceptance of wind power. The project goals are to facilitate wind energy integration at different levels by design and control of suitable energy storage systems. The three levels of wind power system are: Balancing Control Center level, Wind Power Plant level, and Wind Power Generator level. Our scopes are to smooth the wind power fluctuation and also ensure adequate battery life. In the new hybrid energy storage system (HESS) design for wind power generation application, the boundary levels of the state of charge of the battery and that of the supercapacitor are used in the control strategy. In the controller, some logic gates are also used to control the operating time durations of the battery. The sizing method is based on the average fluctuation of wind profiles of a specific wind station. The calculated battery size is dependent on the size of the supercapacitor, state of charge of the supercapacitor and battery wear. To accommodate the wind power fluctuation, a hybrid energy storage system (HESS) consisting of battery energy system (BESS) and super-capacitor is adopted in this project. A probability-based power capacity specification approach for the BESS and super-capacitors is proposed. Through this method the capacities of BESS and super-capacitor are properly designed to combine the characteristics of high energy density of BESS and the characteristics of high power density of super-capacitor. It turns out that the super-capacitor within HESS deals with the high power fluctuations, which contributes to the extension of BESS lifetime, and the super-capacitor can handle the peaks in wind power fluctuations without the severe penalty of round trip losses associated with a BESS. The proposed approach has been verified based on the real wind data from an existing wind power plant in Iowa. An intelligent controller that increases battery life within hybrid energy storage systems for wind application was developed. Comprehensive studies have been conducted and simulation results are analyzed. A permanent magnet synchronous generator, coupled with a variable speed wind turbine, is connected to a power grid (14-bus system). A rectifier, a DC-DC converter and an inverter are used to provide a complete model of the wind system. An Energy Storage System (ESS) is connected to a DC-link through a DC-DC converter. An intelligent controller is applied to the DC-DC converter to help the Voltage Source Inverter (VSI) to regulate output power and also to control the operation of the battery and supercapacitor. This ensures a longer life time for the batteries. The detailed model is simulated in PSCAD/EMTP. Additionally, economic analysis has been done for different methods that can reduce the wind power output fluctuation. These methods are, wind power curtailment, dumping loads, battery energy storage system and hybrid energy storage system. From the results, application of single advanced HESS can save more money for wind turbines owners. Generally the income would be the same for most of methods because the wind does not change and maximum power point tracking can be applied to most systems. On the other hand, the cost is the key point. For short term and small wind turbine, the BESS is the cheapest and applicable method while for large scale wind turbines and wind farms the application of advanced HESS would be the best method to reduce the power fluctuation. The key outcomes of this project include a new intelligent controller that can reduce energy exchanged between the battery and DC-link, reduce charging/discharging cycles, reduce depth of discharge and increase time interval between charge/discharge, and lower battery temperature. This improves the overall lifetime of battery energy storages. Additionally, a new design method based on probability help optimize the power capacity specification for BESS and super-capacitors. Recommendations include experimental imp

  18. Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1

    SciTech Connect (OSTI)

    Ajello, M.; Allafort, A.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Baldini, L.; /INFN, Pisa; Ballet, J.; /AIM, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Bellazzini, R.; /INFN, Pisa; Berenji, B.; Blandford, R.D.; Bloom, E.D.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Bregeon, J.; /INFN, Pisa; Brigida, M.; /Bari Polytechnic /INFN, Bari; Bruel, P.; /Ecole Polytechnique; Buehler, R.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Buson, S.; /INFN, Padua /Padua U.; Caliandro, G.A.; /CSIC, Catalunya; Cameron, R.A.; /Stanford U., HEPL /KIPAC, Menlo Park /SLAC; Caraveo, P.A.; /IASF, Milan /AIM, Saclay /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Unlisted, US /Naval Research Lab, Wash., D.C. /Perugia U. /ASDC, Frascati /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Montpellier U. /ASDC, Frascati /Udine U. /INFN, Trieste /Bari Polytechnic /INFN, Bari /Naval Research Lab, Wash., D.C. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Bari Polytechnic /INFN, Bari /Ecole Polytechnique /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Udine U. /INFN, Trieste /Trieste Observ. /Hiroshima U. /Nagoya U. /Bari Polytechnic /INFN, Bari /INFN, Bari /ASDC, Frascati /INFN, Perugia /Perugia U. /Bari Polytechnic /INFN, Bari /ASDC, Frascati /Bari Polytechnic /INFN, Bari /Bologna Observ. /Stanford U., HEPL /KIPAC, Menlo Park /SLAC /Naval Research Lab, Wash., D.C. /Alabama U., Huntsville /CSIC, Catalunya /Hiroshima U. /NASA, Goddard /Hiroshima U.; /more authors..

    2012-09-14T23:59:59.000Z

    We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. The GeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200 MeV-100 GeV can be described by a broken power-law function with a break of 2.4 {+-} 0.6 (stat) {+-} 1.2 (sys) GeV, and photon indices of 2.10 {+-} 0.06 (stat) {+-} 0.10 (sys) below the break and 2.70 {+-} 0.12 (stat) {+-} 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of p0s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains the GeV gamma-ray spectrum. We also find that the GeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in the GeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.

  19. Fermi Large Area Telescope Observations of the Supernova Remnant G8.7-0.1

    E-Print Network [OSTI]

    ,

    2011-01-01T23:59:59.000Z

    We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) onboard the \\emph{Fermi} Gamma-ray Space Telescope. An investigation of the relationship among G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. The GeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially-connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200 MeV--100 GeV can be described by a broken power-law function with a break of 2.4 $\\pm$ 0.6 (stat) $\\pm$ 1.2 (sys) GeV, and photon indices of 2.10 $\\pm$ 0.06 (stat) $\\pm$ 0.10 (sys) below the break and 2.70 $\\pm$ 0.12 (stat) $\\pm$ 0.14...

  20. VERITAS Observations of the Galactic Center Ridge

    E-Print Network [OSTI]

    ,

    2015-01-01T23:59:59.000Z

    Due to its extraordinarily high concentration of known relativistic particle accelerators such as pulsar wind nebula, supernova remnants, dense molecular cloud regions, and the supermassive black hole (Sgr A*); the center of the Milky Way galaxy has long been an ideal target for high energy (HE, 0.1-100 GeV) and very high energy ( VHE, 50 GeV-50 TeV) gamma-ray emission. Indeed, detections of Sgr A* and other nearby regions of gamma-ray emission have been reported by EGRET and Fermi-LAT in the HE band, as well as CANGAROO, Whipple, HESS, VERITAS, and MAGIC in the VHE band. Here we report on the results of extended observations of the region with VERITAS between 2010-2014. Due to the visibility of the source for VERITAS in the Northern Hemisphere, these observations provide the most sensitive probe of gamma-ray emission above 2 TeV in one of the most complicated and interesting regions of our home galaxy.

  1. A search for optical counterparts of the complex Vela X system

    E-Print Network [OSTI]

    Marubini, T E; Venter, C; de Jager, O C

    2015-01-01T23:59:59.000Z

    The pulsar wind nebula (PWN) associated with the Vela pulsar is a bright source in the radio, X-ray and gamma-ray bands, but not in the optical. This source is very near, lying at a distance of 290 pc, as inferred from the radio and optical parallax measurements of the pulsar. Knowledge of the brightness and structure of the Vela PWN in optical is important in order to constrain the underlying particle spectrum (and possibly the B-field properties and particle losses) associated with this extended source. We use results from the Digital Sky Survey, as well as results obtained using the SAAO 1.0 m telescope equipped with an imaging CCD (STE4) and BV filters, in an attempt to measure optical radiation from Vela X. To enlarge our field of view, we constructed a mosaic consisting of 3 x 3 frames around the pulsar position. We present spectral measurements from the High Energy Stereoscopic System (H.E.S.S.), Fermi Large Area Telescope (LAT), ASCA, Hubble Space Telescope (HST), Very Large Telescope (VLT), New Techn...

  2. MODELING PHOTODISINTEGRATION-INDUCED TeV PHOTON EMISSION FROM LOW-LUMINOSITY GAMMA-RAY BURSTS

    SciTech Connect (OSTI)

    Liu Xuewen [Physics Department, Sichuan University, Chengdu 610065 (China); Wu Xuefeng; Lu Tan, E-mail: astrolxw@gmail.com, E-mail: xfwu@pmo.ac.cn, E-mail: t.lu@pmo.ac.cn [Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)

    2012-05-15T23:59:59.000Z

    Ultra-high-energy cosmic-ray heavy nuclei have recently been considered as originating from nearby low-luminosity gamma-ray bursts that are associated with Type Ibc supernovae. Unlike the power-law decay in long duration gamma-ray bursts, the light curve of these bursts exhibits complex UV/optical behavior: shock breakout dominated thermal radiation peaks at about 1 day, and, after that, nearly constant emission sustained by radioactive materials for tens of days. We show that the highly boosted heavy nuclei at PeV energy interacting with the UV/optical photon field will produce considerable TeV photons via the photodisintegration/photo-de-excitation process. It was later predicted that a thermal-like {gamma}-ray spectrum peaks at about a few TeV, which may serve as evidence of nucleus acceleration. The future observations by the space telescope Fermi and by the ground atmospheric Cherenkov telescopes such as H.E.S.S., VERITAS, and MAGIC will shed light on this prediction.

  3. Towards SiPM camera for current and future generations of Cherenkov telescopes

    E-Print Network [OSTI]

    Mazin, Daniel; Sitarek, Julian; Cortina, Juan; Fink, David; Hose, Jürgen; Illa, Jose Maria; Lorenz, Eckart; Martínez, Manel; Menzel, Uta; Mirzoyan, Razmik; Teshima, Masahiro

    2014-01-01T23:59:59.000Z

    So far the current ground-based Imaging Atmospheric Cherenkov Telescopes (IACTs) have energy thresholds in the best case in the range of ~30 to 50 GeV (H.E.S.S. II and MAGIC telescopes). Lowest energy gamma-ray showers produce low light intensity images and cannot be efficiently separated from dominating images from hadronic background. A cost effective way of improving the telescope performance at lower energies is to use novel photosensors with superior photon detection efficiency (PDE). Currently the best commercially available superbialkali photomultipliers (PMTs) have a PDE of about 30-33%, whereas the silicon photomultipliers (SiPMs, also known as MPPC, GAPD) from some manufacturers show a photon detection efficiency of about 40-45%. Using these devices can lower the energy threshold of the instrument and may improve the background rejection due to intrinsic properties of SiPMs such as a superb single photoelectron resolution. Compared to PMTs, SiPMs are more compact, fast in response, operate at low vo...

  4. Linking radio and gamma ray emission in Ap Librae

    E-Print Network [OSTI]

    Hervet, O; Sol, H

    2015-01-01T23:59:59.000Z

    Ap Lib is one of the rare Low Synchrotron Peaked blazars detected so far at TeV energies. This type of source is not properly modelled by standard one-zone leptonic Synchrotron-self-Compton (SSC) emission scenarios. The aim of this paper is to study the relevance of additional components which should naturally occur in a SSC scenario for a better understanding of the emission mechanisms, especially at very high energies (VHE). Methods. We use simultaneous data from a multi-wavelength campaign of Planck, Swift-UVOT and Swift-XRT telescopes carried out in February 2010, as well as quasi-simultaneous data of WISE, Fermi and H.E.S.S. taken in 2010. The multi-lambda emission of Ap Lib is modelled by a blob-in-jet SSC scenario including the contribution of the base of the VLBI extended jet, the radiative blob-jet interaction, the accretion disk and its associated external photon field. We show that signatures of a strong parsec-scale jet and of an accretion disk emission are present in the SED. We can link the obse...

  5. How precisely neutrino emission from supernova remnants can be constrained by gamma ray observations?

    E-Print Network [OSTI]

    F. L. Villante; F. Vissani

    2008-07-25T23:59:59.000Z

    We propose a conceptually and computationally simple method to evaluate the neutrinos emitted by supernova remnants using the observed gamma-ray spectrum. The proposed method does not require any preliminary parametrization of the gamma ray flux; the gamma ray data can be used as an input. In this way, we are able to propagate easily the observational errors and to understand how well the neutrino flux and the signal in neutrino telescopes can be constrained by gamma-ray data. We discuss the various possible sources of theoretical and systematical uncertainties (e.g., neutrino oscillation parameters, hadronic modeling, etc.), obtaining an estimate of the accuracy of our calculation. Furthermore, we apply our approach to the supernova remnant RX J1713.7-3946, showing that neutrino emission is very-well constrained by the H.E.S.S. gamma-ray data: indeed, the accuracy of our prediction is limited by theoretical uncertainties. Neutrinos from RX J1713.7-3946 can be detected with an exposure of the order km^2 year, provided that the detection threshold in future neutrino telescopes will be equal to about 1 TeV.

  6. Method to extract the primary cosmic ray spectrum from very high energy gamma-ray data and its application to SNR RX J1713.7-3946

    E-Print Network [OSTI]

    F. L. Villante; F. Vissani

    2008-01-04T23:59:59.000Z

    Supernova remnants are likely to be the accelerators of the galactic cosmic rays. Assuming the correctness of this hypothesis, we develop a method to extract the parent cosmic ray spectrum from the VHE gamma ray flux emitted by supernova remnants (and other gamma transparent sources). Namely, we calculate semi-analytically the (inverse) operator which relates an arbitrary gamma ray flux to the parent cosmic ray spectrum, without relying on any theoretical assumption about the shape of the cosmic ray and/or photon spectrum. We illustrate the use of this technique by applying it to the young SNR RX J1713.7-3946 which has been observed by H.E.S.S. experiment during the last three years. Specific implementations of the method permit to use as an input either the parameterized VHE gamma ray flux or directly the raw data. The possibility to detect features in the cosmic rays spectrum and the error in the determination of the parent cosmic ray spectrum are also discussed.

  7. On the formation of TeV radiation in LS 5039

    E-Print Network [OSTI]

    Dmitry Khangulyan; Felix Aharonian; Valenti Bosch-Ramon

    2007-10-10T23:59:59.000Z

    The recent detections of TeV gamma-rays from compact binary systems show that relativistic outflows (jets or winds) are sites of effective acceleration of particles up to multi-TeV energies. In this paper, we discuss the conditions of acceleration and radiation of ultra-relativistic electrons in LS 5039, the gamma-ray emitting binary system for which the highest quality TeV data are available. Assuming that the gamma-ray emitter is a jet-like structure, we performed detailed numerical calculations of the energy spectrum and lightcurves accounting for the acceleration efficiency, the location of the accelerator, the speed of the emitting flow, the inclination angle of the system, as well as specific features related to anisotropic inverse Compton scattering and pair production. We conclude that the accelerator should not be deep inside the binary system unless we assume a very efficient acceleration rate. We show that within the IC scenario both the gamma-ray spectrum and flux are strongly orbital phase dependent. Formally, our model can reproduce, for specific sets of parameter values, the energy spectrum of gamma-rays reported by HESS for wide orbital phase intervals. However, the physical properties of the source can be constrained only by observations capable of providing detailed energy spectra for narrow orbital phase intervals ($\\Delta\\phi\\ll 0.1$).

  8. Prospects for GeV-TeV detection of short gamma-ray bursts with extended emission

    SciTech Connect (OSTI)

    Veres, P.; Mészáros, P., E-mail: veres@gwu.edu [Department of Astronomy and Astrophysics Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802 (United States)

    2014-06-01T23:59:59.000Z

    We discuss the GeV to TeV photon emission of gamma-ray bursts (GRBs) within the refreshed shock and the continuous injection scenarios, motivated by the observation of extended emission in a substantial fraction of short GRBs. In the first model we assume that the central engine promptly emits material with a range of Lorentz factors. When the fastest shell starts to decelerate, it drives a forward shock into the ambient medium and a reverse shock into the ejecta. These shocks are reenergized by the slower and later arriving material. In the second model we assume that there is a continued ejection of material over an extended time, and the continuously arriving new material keeps reenergizing the shocks formed by the preceding shells of ejecta. We calculate the synchrotron and synchrotron self-Compton radiation components for the forward and reverse shocks and find that prospective and current GeV-TeV range instruments such as CTA, HAWC, VERITAS, MAGIC, and HESS have a good chance of detecting afterglows of short bursts with extended emission, assuming a reasonable response time.

  9. High Energy Processes in Pulsar Wind Nebulae

    E-Print Network [OSTI]

    W. Bednarek

    2006-10-11T23:59:59.000Z

    Young pulsars produce relativistic winds which interact with matter ejected during the supernova explosion and the surrounding interstellar gas. Particles are accelerated to very high energies somewhere in the pulsar winds or at the shocks produced in collisions of the winds with the surrounding medium. As a result of interactions of relativistic leptons with the magnetic field and low energy radiation (of synchrotron origin, thermal, or microwave background), the non-thermal radiation is produced with the lowest possible energies up to $\\sim$100 TeV. The high energy (TeV) gamma-ray emission has been originally observed from the Crab Nebula and recently from several other objects. Recent observations by the HESS Cherenkov telescopes allow to study for the first time morphology of the sources of high energy emission, showing unexpected spectral features. They might be also interpreted as due to acceleration of hadrons. However, theory of particle acceleration in the PWNe and models for production of radiation are still at their early stage of development since it becomes clear that realistic modeling of these objects should include their time evolution and three-dimensional geometry. In this paper we concentrate on the attempts to create a model for the high energy processes inside the PWNe which includes existence not only relativistic leptons but also hadrons inside the nebula. Such model should also take into account evolution of the nebula in time. Possible high energy expectations based on such a model are discussed in the context of new observations.

  10. A KINEMATIC DISTANCE STUDY OF THE PLANETARY NEBULAE-SUPERNOVA REMNANT-H II REGION COMPLEX AT G35.6–0.5

    SciTech Connect (OSTI)

    Zhu, H.; Tian, W. W.; Su, H. Q. [Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Torres, D. F.; Pedaletti, G., E-mail: zhuhui@bao.ac.cn, E-mail: tww@bao.ac.cn [Institute of Space Sciences (IEEC-CSIC), Campus UAB, Torre C5, 2a planta, E-08193 Barcelona (Spain)

    2013-10-01T23:59:59.000Z

    Two possible planetary nebulae (PN G035.5–00.4 and IRAS 18551+0159), one newly re-identified supernova remnant (SNR G35.6–0.4), and one H II region (G35.6–0.5) form a line-of-sight-overlapping complex known as G35.6–0.5. We analyze 21 cm H I absorption spectra toward the complex to constrain the kinematic distances of these objects. PN G035.5–00.4 has a distance from 3.8 ± 0.4 kpc to 5.4 ± 0.7 kpc. IRAS 18551+0159 is at 4.3 ± 0.5 kpc. We discuss the distance for SNR 35.6–0.4, for which the previous estimate was 10.5 kpc, and find a plausible distance of 3.6 ± 0.4 kpc. The new distance of SNR G35.6–0.4 and the derived mass for the ?55 km s{sup –1} CO molecular cloud can accommodate an association with HESS J1858+020. We also conclude that SNR G35.6–0.4 is unlikely to be associated with PSR J1857+0210 or PSR J1857+0212, which are projected onto the SNR area.

  11. Development of a mid-sized Schwarzschild-Couder Telescope for the Cherenkov Telescope Array

    SciTech Connect (OSTI)

    Cameron, Robert A.

    2012-06-28T23:59:59.000Z

    The Cherenkov Telescope Array (CTA) is a ground-based observatory for very high-energy (10 GeV to 100 TeV) gamma rays, planned for operation starting in 2018. It will be an array of dozens of optical telescopes, known as Atmospheric Cherenkov Telescopes (ACTs), of 8 m to 24 m diameter, deployed over an area of more than 1 square km, to detect flashes of Cherenkov light from showers initiated in the Earth's atmosphere by gamma rays. CTA will have improved angular resolution, a wider energy range, larger fields of view and an order of magnitude improvement in sensitivity over current ACT arrays such as H.E.S.S., MAGIC and VERITAS. Several institutions have proposed a research and development program to eventually contribute 36 medium-sized telescopes (9 m to 12 m diameter) to CTA to enhance and optimize its science performance. The program aims to construct a prototype of an innovative, Schwarzschild-Couder telescope (SCT) design that will allow much smaller and less expensive cameras and much larger fields of view than conventional Davies-Cotton designs, and will also include design and testing of camera electronics for the necessary advances in performance, reliability and cost. We report on the progress of the mid-sized SCT development program.

  12. The proton microquasar

    E-Print Network [OSTI]

    Gabriela S. Vila; Gustavo E. Romero

    2008-10-06T23:59:59.000Z

    We present a model for high-energy emission in microquasars where the energy content of the jets is dominated by relativistic protons. We also include a primary leptonic component. Particles are accelerated up to relativistic energies in a compact region located near the base of the jet, where most of the emission is produced. We calculate the production spectrum due to proton and electron synchrotron radiation and photohadronic interactions. The target field for proton-photon collisions is provided by the synchrotron radiation in the acceleration region. In models with a significant leptonic component, strong internal photon-photon absorption can attenuate the emission spectrum at high energies. Depending on the values of the parameters, our model predicts luminosities in the range 10^34-10^37 erg s^-1 up to GeV energies, with a high-energy tail that can extend up to 10^16 eV. In some cases, however, absorption effects can completely suppress the emission above 10 GeV, giving rise to different spectral shapes. These results can be tested in the near future by observations with instruments like GLAST-Fermi, HESS II and MAGIC II.

  13. Axion-like particles explain the unphysical redshift-dependence of AGN gamma-ray spectra

    E-Print Network [OSTI]

    Galanti, Giorgio; De Angelis, Alessandro; Bignami, Giovanni F

    2015-01-01T23:59:59.000Z

    Blazars are a class of AGN known to be powerful very-high-energy (VHE, 100 GeV - 100 TeV) celestial gamma-ray emitters. At the time of writing, 41 blazars, spread all over the sky and with known redshift in the range $0.0215 \\leq z \\leq 0.635$ have been observed in the VHE band by the Imaging Atmospheric Cherenkov Telescopes H.E.S.S., MAGIC and VERITAS. Thus, they represent an isotropic and relatively local extragalactic sample, unaffected by significant cosmological evolution. The blazar emitted spectra are well fitted by a power law with index $\\Gamma_{\\rm em}$. We show that the $\\Gamma_{\\rm em}$ distribution exhibits an unexpected and previously unnoticed unphysical redshift-dependence. We demonstrate that this result is not due to any selection effect. It is difficult to imagine an intrinsic mechanism which could lead to such a spectral variation, and so this result seriously challenges the conventional view. We propose that such a behaviour is explained by oscillations between the VHE gamma-rays and Axio...

  14. Advanced Microturbine Systems

    SciTech Connect (OSTI)

    None

    2005-12-31T23:59:59.000Z

    Dept. of Energy (DOE) Cooperative Agreement DE-FC02-00-CH11061 was originally awarded to Honeywell International, Inc. â?? Honeywell Power Systems Inc. (HPSI) division located in Albuquerque, NM in October 2000 to conduct a program titled Advanced Microturbine Systems (AMS). The DOE Advanced Microturbines Systems Program was originally proposed as a five-year program to design and develop a high efficiency, low emissions, durable microturbine system. The period of performance was to be October 2000 through September 2005. Program efforts were underway, when one year into the program Honeywell sold the intellectual property of Honeywell Power Systems Inc. and HPSI ceased business operations. Honeywell made an internal decision to restructure the existing program due to the HPSI shutdown and submitted a formal request to DOE on September 24, 2001 to transfer the Cooperative Agreement to Honeywell Engines, Systems and Services (HES&S) in Phoenix, AZ in order to continue to offer support for DOE's Advanced Microturbine Program. Work continued on the descoped program under Cooperative Agreement No. DE-FC26-00-CH11061 and has been completed.

  15. Cosmic-ray induced gamma-ray emission from the starburst galaxy NGC 253

    SciTech Connect (OSTI)

    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

    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.

  16. Study of TeV shell supernova remnants at gamma-ray energies

    E-Print Network [OSTI]

    Acero, F; Renaud, M; Ballet, J; Hewitt, J W; Rousseau, R; Tanaka, T

    2015-01-01T23:59:59.000Z

    The breakthrough developments of Cherenkov telescopes in the last decade have led to angular resolution of 0.1{\\deg} and an unprecedented sensitivity. This has allowed the current generation of Cherenkov telescopes to discover a population of supernova remnants (SNRs) radiating in very-high-energy (VHE, E>100 GeV) gamma-rays. A number of those VHE SNRs exhibit a shell-type morphology spatially coincident with the shock front of the SNR. The members of this VHE shell SNR club are RX J1713.7-3946, Vela Jr, RCW 86, SN 1006, and HESS J1731-347. The latter two objects have been poorly studied in high-energy (HE, 0.1 5 sigma. With this Fermi analysis, we now have a complete view of the HE to VHE gamma-ray emission of TeV shell SNRs. All five sources have a hard HE photon index (<1.8) suggesting a common scenario where the bulk of the emission is produced by accelerated electrons radiating from radio to VHE gamma-rays through synchrotron and inverse Compton processes. In addition when correcting for the distance,...

  17. Transmission integral analysis of Mössbauer spectra displaying hyperfine parameter distributions with arbitrary profile

    SciTech Connect (OSTI)

    Klencsár, Zoltán, E-mail: z.klencsar@mosswinn.hu [Pitvar u. 11., Budapest 1141 (Hungary)

    2014-10-27T23:59:59.000Z

    Accurate quantitative analysis of Mössbauer spectra displaying thickness effects requires the consideration of the so-called transmission integral when modeling the spectral shape. Whereas this is straightforward when the correct model for the decomposition of the absorber's nuclear resonance absorption cross-section into individual components is a priori known, in the absence of such knowledge and notably in the presence of hyperfine parameter distributions with an unknown profile, the so-called model-independent evaluation methods could be used to fit the spectra. However, the methods available for this purpose were developed for the analysis of spectra for which the thin absorber approximation is valid, and thus they do not take the sample thickness and related effects into account. Consequently, in order to use them for spectra displaying thickness effects, their usage needs to be generalized by combining them with transmission integral fitting. A new algorithm realizing such a generalized version of the Hesse-Rübartsch model-independent evaluation method was developed recently as an integral part of the MossWinn program. In the present work, the working principle of the newly developed algorithm is described in details along with examples illustrating the capabilities of the method for the case of {sup 57}Fe Mössbauer spectroscopy.

  18. Towards a Flexible Array Control and Operation Framework for CTA

    E-Print Network [OSTI]

    E. Birsin; J. Colomé; D. Hoffmann; H. Koeppel; G. Lamanna; T. Le Flour; A. Lopatin; E. Lyard; D. Melkumyan; I. Oya; J-L. Panazol; S. Schlenstedt; T. Schmidt; U. Schwanke; R. Walter; P. Wegner for the CTA Consortium

    2012-11-23T23:59:59.000Z

    The Cherenkov Telescope Array (CTA) \\cite{CTA:2010} will be the successor to current Imaging Atmospheric Cherenkov Telescopes (IACT) like H.E.S.S., MAGIC and VERITAS. CTA will improve in sensitivity by about an order of magnitude compared to the current generation of IACTs. The energy range will extend from well below 100 GeV to above 100 TeV. To accomplish these goals, CTA will consist of two arrays, one in each hemisphere, consisting of 50-80 telescopes and composed of three different telescope types with different mirror sizes. It will be the first open observatory for very high energy $\\gamma$-ray astronomy. The Array Control working group of CTA is currently evaluating existing technologies which are best suited for a project like CTA. The considered solutions comprise the ALMA Common Software (ACS), the OPC Unified Architecture (OPC UA) and the Data Distribution Service (DDS) for bulk data transfer. The first applications, like an automatic observation scheduler and the control software for some prototype instrumentation have been developed.

  19. Depositional and diagenetic characteristics of a phylloid algal mound, upper Palo Pinto Formation, Conley field, Hardeman County, Texas

    E-Print Network [OSTI]

    Lovell, Stephen Edd

    1988-01-01T23:59:59.000Z

    the discovery of Conley field in 1959, only one successful well and 40 dry holes had been drilled in the basin (Oil and Gas Journal, 1961) . Initial exploration at Conley field was conducted by the Amerada Petroleum Company prior to 1939 (Freeman, 1964.... Lithofacies patterns are defined in Figure 5. The cored interval from this well is indicated by the cross hatched section. GAMMA RAY API units 75 SHELL OIL COMPANY CONLEY 7 depth (ft. ) 70 SONIC p. sec/ft. Top Palo Pinto 5154 rrrrrrrrrrrrrrr...

  20. VARIABLE TeV EMISSION AS A MANIFESTATION OF JET FORMATION IN M87?

    SciTech Connect (OSTI)

    Levinson, Amir [School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978 (Israel); Rieger, Frank [Max-Planck-Institut fuer Kernphysik, P.O. Box 103980, 69029 Heidelberg (Germany)

    2011-04-01T23:59:59.000Z

    It is proposed that the variable TeV emission observed in M87 may be produced in a starved magnetospheric region, above which the outflow associated with the VLBA jet is established. It is shown that annihilation of MeV photons emitted by the radiative inefficient flow in the vicinity of the black hole can lead to injection of seed charges on open magnetic field lines, with a density that depends sensitively on accretion rate, n{sub {+-}}{proportional_to} m-dot {sup 4}. For an accretion rate that corresponds to the inferred jet power, and to a fit of the observed spectral energy distribution by an ADAF model, the density of injected pairs is found to be smaller than the Goldreich-Julian (GJ) density by a factor of a few. It is also shown that inverse Compton scattering of ambient photons by electrons (positrons) accelerating in the gap can lead to a large multiplicity, {approx}10{sup 3}, while still allowing photons at energies of up to a few TeV to freely escape the system. The estimated gap width is not smaller than 0.01r{sub s} if the density of seed charges is below the GJ value. The very high energy power radiated by the gap can easily account for the luminosity of the TeV source detected by H.E.S.S. The strong dependence of injected pair density on accretion rate should render the gap emission highly intermittent. We also discuss briefly the application of this mechanism to Sgr A{sup *}.

  1. In Wino Veritas? Indirect Searches Shed Light on Neutralino Dark Matter

    E-Print Network [OSTI]

    JiJi Fan; Matthew Reece

    2013-07-16T23:59:59.000Z

    Indirect detection constraints on gamma rays (both continuum and lines) have set strong constraints on wino dark matter. By combining results from Fermi-LAT and HESS, we show that: light nonthermal wino dark matter is strongly excluded; thermal wino dark matter is allowed only if the Milky Way dark matter distribution has a significant (>~0.4 kpc) core; and for plausible NFW and Einasto distributions the entire range of wino masses from 100 GeV up to 3 TeV can be excluded. The case of light, nonthermal wino dark matter is particularly interesting in scenarios with decaying moduli that reheat the universe to a low temperature. Typically such models have been discussed for low reheating temperatures, not far above the BBN bound of a few MeV. We show that constraints on the allowed wino relic density push such models to higher reheating temperatures and hence heavier moduli. Even for a flattened halo model consisting of an NFW profile with constant-density core inside 1 kpc and a density near the sun of 0.3 GeV/cm^3, for 150 GeV winos current data constrains the reheat temperature to be above 1.4 GeV. As a result, for models in which the wino mass is a loop factor below the gravitino mass, the data favor moduli that are more than an order of magnitude heavier than the gravitino. We discuss some of the sobering implications of this result for the status of supersymmetry. We also comment on other neutralino dark matter scenarios, in particular the case of mixed bino/higgsino dark matter. We show that in this case, direct and indirect searches are complementary to each other and could potentially cover most of the parameter space.

  2. High-Energy Cosmology: gamma rays and neutrinos from beyond the galaxy

    E-Print Network [OSTI]

    Charles D. Dermer

    2006-11-06T23:59:59.000Z

    Our knowledge of the high-energy universe is undergoing a period of rapid change as new astronomical detectors of high-energy radiation start to operate at their design sensitivities. Now is a boomtime for high-energy astrophysics, with new discoveries from Swift and HESS, results from MAGIC and VERITAS starting to be reported, the upcoming launches of the gamma-ray space telescopes GLAST and AGILE, and anticipated data releases from IceCube and Auger. A formalism for calculating statistical properties of cosmological gamma-ray sources is presented. Application is made to model calculations of the statistical distributions of gamma-ray and neutrino emission from (i) beamed sources, specifically, long-duration GRBs, blazars, and extagalactic microquasars, and (ii) unbeamed sources, including normal galaxies, starburst galaxies and clusters. Expressions for the integrated intensities of faint beamed and unbeamed high-energy radiation sources are also derived. A toy model for the background intensity of radiation from dark-matter annihilation taking place in the early universe is constructed. Estimates for the gamma-ray fluxes of local group galaxies, starburst, and infrared luminous galaxies are briefly reviewed. Because the brightest extragalactic gamma-ray sources are flaring sources, and these are the best targets for sources of PeV -- EeV neutrinos and ultra-high energy cosmic rays, rapidly slewing all-sky telescopes like MAGIC and an all-sky gamma-ray observatory beyond Milagro will be crucial for optimal science return in the multi-messenger age.

  3. Extragalactic background light absorption signal in the TeV gamma-ray spectra of blazars

    E-Print Network [OSTI]

    V. V. Vassiliev

    1999-08-09T23:59:59.000Z

    Recent observations of the TeV gamma-ray spectra of the two closest active galactic nuclei (AGNs), Markarian 501 (Mrk 501) and Markarian 421 (Mrk 421), by the Whipple and HEGRA collaborations have stimulated efforts to estimate or limit the spectral energy density (SED) of extragalactic background light (EBL) which causes attenuation of TeV photons via pair-production when they travel cosmological distances. In spite of the lack of any distinct cutoff-like feature in the spectra of Mrk 501 and Mrk 421 (in the interval 0.26-10 TeV) which could clearly indicate the presence of such a photon absorption mechanism, we demonstrate that strong EBL attenuation signal (survival probability of 10 TeV photon <10^{-2}) may still be present in the spectra of these AGNs. By estimating the minimal and maximal opacity of the universe to TeV gamma-ray photons, we calculate the visibility range for current and future gamma-ray observatories. Finally, we show that the proposed experiments, VERITAS, HESS, and MAGIC, may even be able to actually measure the EBL SED because their observations extend to the critical 75-150 GeV regime. In this transition region a distinct ``knee-like'' feature should exist in the spectra of blazars, which is invariant with respect to their intrinsic properties. The change of the spectral index and flux amplitude across this knee, if observed for several blazars, will provide missing pieces of information needed to measure EBL in the wavelength range 0.1-30 $\\mu$m.

  4. Propagation of very high energy gamma-rays inside massive binaries LS 5039 and LSI +61 303

    E-Print Network [OSTI]

    W. Bednarek

    2006-01-28T23:59:59.000Z

    It is expected that high energy gamma-rays, if injected relatively close to the massive stars in binary systems LS 5039 and LSI 61 3003, should be strongly absorbed, initiating inverse Compton $e^\\pm$ pair cascades in the anisotropic radiation from stellar surfaces. We investigate influence of the propagation effects on the spectral and angular features of the gamma-ray spectra emerging from these two binary systems by applying the Monte Carlo method. Two different hypothesis are considered: isotropic injection of primary gamma-rays with the power law spectrum and electrons. It is concluded that propagation effects of gamma-rays can be responsible for the spectral features observed from LS 5039. The cascade processes occurring inside these binary systems significantly reduce the gamma-ray opacity obtained in other works by simple calculations of the escape of gamma-rays from the radiation fields of the massive stars. Both systems provide very similar conditions for the TeV gamma-ray production at the periastron passage. Any TeV gamma-ray flux at the apastron passage in LSI +61 303 will be relatively stronger with respect to its GeV flux than in LS 5039. If gamma-rays are produced inside these binaries not far from the massive stars, i.e. within a few stellar radii, then clear anticorrelation between the GeV and TeV emission should be observed, provided that primary gamma-rays at GeV and TeV energies are produced in the same process by the same population of relativistic particles. These gamma-ray propagation features can be tested in the near future by the multi-wavelength campaigns engaging the AGILE and GLAST telescopes and the Cherenkov telescopes (e.g. MAGIC, HESS, VERITAS and CANGAROO).

  5. GeV-TeV gamma-ray light curves expected in the IC electron-positron pair cascade model for massive binaries: Application to LS 5039

    E-Print Network [OSTI]

    W. Bednarek

    2006-11-09T23:59:59.000Z

    TeV gamma-ray emission from two massive binaries of the microquasar type, LS 5039 and LS I +61$^{\\rm o}$ 303, show clear variability with their orbital periods. Our purpose is to calculate the GeV and TeV $\\gamma$-ray light curves from the massive binary LS 5039 which are expected in the specific Inverse Compton $e^\\pm$ pair cascade model. This model successfully predicted the basic features of the high energy $\\gamma$-ray emission from LS 5039 and LS I +61 303. In the calculations we apply the Monte Carlo code which follows the IC $e^\\pm$ pair cascade in the anisotropic radiation of the massive star. The $\\gamma$-ray light curves and spectra are obtained for different parameters of the acceleration scenario and the inclination angles of the binary system. It is found that the GeV and TeV $\\gamma$-ray light curves should be anti-correlated. This feature can be tested in the near future by the simultaneous observations of LS 5039 with the AGILE and GLAST telescopes in GeV energies and the Cherenkov telescopes in the TeV energies. Considered model also predicts a broad maximum in the TeV $\\gamma$-ray light curve between the phases $\\sim 0.4-0.8$ consistently with the observations of LS 5039 by the HESS telescopes. Moreover, we predict additional dip in the TeV light curve for large inclination angles $\\sim 60^{\\rm o}$. This feature could serve as a diagnostic for independent measuring of the inclination angle of this binary system indicating also on the presence of a neutron star in LS 5039.

  6. Radio and gamma-ray constraints on dark matter annihilation in the Galactic center

    E-Print Network [OSTI]

    Roland M. Crocker; Nicole F. Bell; Csaba Balázs; David I. Jones

    2010-03-15T23:59:59.000Z

    We determine upper limits on the dark matter (DM) self-annihilation cross section for scenarios in which annihilation leads to the production of electron--positron pairs. In the Galactic centre (GC), relativistic electrons and positrons produce a radio flux via synchroton emission, and a gamma ray flux via bremsstrahlung and inverse Compton scattering. On the basis of archival, interferometric and single-dish radio data, we have determined the radio spectrum of an elliptical region around the Galactic centre of extent 3 degrees semi-major axis (along the Galactic plane) and 1 degree semi-minor axis and a second, rectangular region, also centered on the GC, of extent 1.6 degrees x 0.6 degrees. The radio spectra of both regions are non-thermal over the range of frequencies for which we have data: 74 MHz -- 10 GHz. We also consider gamma-ray data covering the same region from the EGRET instrument (about GeV) and from HESS (around TeV). We show how the combination of these data can be used to place robust constraints on DM annihilation scenarios, in a way which is relatively insensitive to assumptions about the magnetic field amplitude in this region. Our results are approximately an order of magnitude more constraining than existing Galactic centre radio and gamma ray limits. For a DM mass of m_\\chi =10 GeV, and an NFW profile, we find that the velocity-averaged cross-section must be less than a few times 10^-25 cm^3 s^-1.

  7. PRE-MAIN-SEQUENCE STELLAR POPULATIONS ACROSS SHAPLEY CONSTELLATION III. I. PHOTOMETRIC ANALYSIS AND IDENTIFICATION ,

    SciTech Connect (OSTI)

    Gouliermis, Dimitrios A.; Gennaro, Mario; Henning, Thomas; Da Rio, Nicola; Brandner, Wolfgang [Max Planck Institute for Astronomy, Koenigstuhl 17, 69117 Heidelberg (Germany); Dolphin, Andrew E. [Raytheon Company, P.O. Box 11337, Tucson, AZ 85734 (United States); Robberto, Massimo; Panagia, Nino [Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218 (United States); Gruendl, Robert A.; Chu, You-Hua [Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801 (United States); Rosa, Michael; Romaniello, Martino [ESO, Karl-Schwarzschild-Str. 2, 85748 Garching (Germany); De Marchi, Guido [ESA, Space Science Department, Keplerlaan 1, 2200 AG Noordwijk (Netherlands); Zinnecker, Hans [Institut fuer Raumfahrtsyteme, Universitaet Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart (Germany)

    2011-09-10T23:59:59.000Z

    We present our investigation of pre-main-sequence (PMS) stellar populations in the Large Magellanic Cloud (LMC) from imaging with Hubble Space Telescope Wide-Field Planetary Camera 2. Our targets of interest are four star-forming regions located at the periphery of the super-giant shell LMC 4 (Shapley Constellation III). The PMS stellar content of the regions is revealed through the differential Hess diagrams and the observed color-magnitude diagrams (CMDs). Further statistical analysis of stellar distributions along cross sections of the faint part of the CMDs allowed the quantitative assessment of the PMS stars census, and the isolation of faint PMS stars as the true low-mass stellar members of the regions. These distributions are found to be well represented by a double-Gaussian function, the first component of which represents the main-sequence field stars and the second the native PMS stars of each region. Based on this result, a cluster membership probability was assigned to each PMS star according to its CMD position. The higher extinction in the region LH 88 did not allow the unambiguous identification of its native stellar population. The CMD distributions of the PMS stars with the highest membership probability in the regions LH 60, LH 63, and LH 72 exhibit an extraordinary similarity among the regions, suggesting that these stars share common characteristics, as well as common recent star formation history. Considering that the regions are located at different areas of the edge of LMC 4, this finding suggests that star formation along the super-giant shell may have occurred almost simultaneously.

  8. Hints of the Existence of Axion-Like-Particles From the Gamma-Ray Spectra of Cosmological Sources

    SciTech Connect (OSTI)

    Sanchez-Conde, M.A.; /IAA, Granada /SLAC; Paneque, D.; Bloom, E.; /KIPAC, Menlo Park; Prada, F.; /IAA, Granada /UC, Santa Cruz; Dominguez, A.; /IAA, Granada /Seville U.; ,

    2009-06-23T23:59:59.000Z

    Axion Like Particles (ALPs) are predicted to couple with photons in the presence of magnetic fields. This effect may lead to a significant change in the observed spectra of gamma-ray sources such as AGNs. Here we carry out a detailed study that for the first time simultaneously considers in the same framework both the photon/axion mixing that takes place in the gamma-ray source and that one expected to occur in the intergalactic magnetic fields. An efficient photon/axion mixing in the source always means an attenuation in the photon flux, whereas the mixing in the intergalactic medium may result in a decrement and/or enhancement of the photon flux, depending on the distance of the source and the energy considered. Interestingly, we find that decreasing the value of the intergalactic magnetic field strength, which decreases the probability for photon/axion mixing, could result in an increase of the expected photon flux at Earth if the source is far enough. We also find a 30% attenuation in the intensity spectrum of distant sources, which occurs at an energy that only depends on the properties of the ALPs and the intensity of the intergalactic magnetic field, and thus independent of the AGN source being observed. Moreover, we show that this mechanism can easily explain recent puzzles in the spectra of distant gamma-ray sources, like the possible detection of TeV photons from 3C 66A (a source located at z=0.444) by MAGIC and VERITAS, which should not happen according to conventional models of photon propagation over cosmological distances. Another puzzle is the recent published lower limit to the EBL intensity at 3.6 {micro}m (which is almost twice larger as the previous one), which implies very hard spectra for some detected TeV gamma-ray sources located at z=0.1-0.2. The consequences that come from this work are testable with the current generation of gamma-ray instruments, namely Fermi (formerly known as GLAST) and imaging atmospheric Cherenkov telescopes like CANGAROO, HESS, MAGIC and VERITAS.

  9. Synthesis and Evaluation of Cu/SAPO-34 Catalysts for NH3-SCR 2: Solid-state Ion Exchange and One-pot Synthesis

    SciTech Connect (OSTI)

    Gao, Feng; Walter, Eric D.; Washton, Nancy M.; Szanyi, Janos; Peden, Charles HF

    2015-01-01T23:59:59.000Z

    Cu-SAPO-34 catalysts are synthesized using two methods: solid-state ion exchange (SSIE) and one-pot synthesis. SSIE is conducted by calcining SAPO-34/CuO mixtures at elevated temperatures. For the one-pot synthesis method, Cu-containing chemicals (CuO and CuSO4) are added during gel preparation. A high-temperature calcination step is also needed for this method. Catalysts are characterized with surface area/pore volume measurements, temperature programmed reduction (TPR), electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) spectroscopies, and scanning electron microscopy (SEM). Catalytic properties are examined using standard ammonia selective catalytic reduction (NH3-SCR) and ammonia oxidation reactions. In Cu-SAPO-34 samples formed using SSIE, Cu presents both as isolated Cu2+ ions and unreacted CuO. The former is highly active and selective in NH3-SCR, while the latter catalyzes a side reaction; notably, the non-selective oxidation of NH3 above 350 ºC. Using the one-pot method followed by a high-temperature aging treatment, it is possible to form Cu SAPO-34 samples with predominately isolated Cu2+ ions at low Cu loadings. However at much higher Cu loadings, isolated Cu2+ ions that bind weakly with the CHA framework and CuO clusters also form. These Cu moieties are very active in catalyzing non-selective NH3 oxidation above 350 ºC. Low-temperature reaction kinetics indicate that Cu-SAPO-34 samples formed using SSIE have core-shell structures where Cu is enriched in the shell layers; while Cu is more evenly distributed within the one-pot samples. Reaction kinetics also suggest that at low temperatures, the local environment next to Cu2+ ion centers plays little role on the overall catalytic properties. The authors gratefully acknowledge the US Department of Energy (DOE), Energy Efficiency and Renewable Energy, Vehicle Technologies Office for the support of this work. The research described in this paper was performed at the Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility sponsored by the DOE’s Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory (PNNL). PNNL is operated for the US DOE by Battelle under contract number DE-AC05-76RL01830. The authors also thank Shari Li (PNNL) for surface area/pore volume measurements, and Bruce W. Arey (PNNL) for SEM measurements. Discussions with Drs. A. Yezerets, K. Kamasamudram, J.H. Li, N. Currier and J.Y. Luo from Cummins, Inc. and H.Y. Chen and H. Hess from Johnson-Matthey are greatly appreciated.

  10. Final Report: Assessment of Combined Heat and Power Premium Power Applications in California

    SciTech Connect (OSTI)

    Norwood, Zack; Lipman, Tim; Marnay, Chris; Kammen, Dan

    2008-09-30T23:59:59.000Z

    This report analyzes the current economic and environmental performance of combined heat and power (CHP) systems in power interruption intolerant commercial facilities. Through a series of three case studies, key trade-offs are analyzed with regard to the provision of black-out ridethrough capability with the CHP systems and the resutling ability to avoid the need for at least some diesel backup generator capacity located at the case study sites. Each of the selected sites currently have a CHP or combined heating, cooling, and power (CCHP) system in addition to diesel backup generators. In all cases the CHP/CCHP system have a small fraction of the electrical capacity of the diesel generators. Although none of the selected sites currently have the ability to run the CHP systems as emergency backup power, all could be retrofitted to provide this blackout ride-through capability, and new CHP systems can be installed with this capability. The following three sites/systems were used for this analysis: (1) Sierra Nevada Brewery - Using 1MW of installed Molten Carbonate Fuel Cells operating on a combination of digestor gas (from the beer brewing process) and natural gas, this facility can produce electricty and heat for the brewery and attached bottling plant. The major thermal load on-site is to keep the brewing tanks at appropriate temperatures. (2) NetApp Data Center - Using 1.125 MW of Hess Microgen natural gas fired reciprocating engine-generators, with exhaust gas and jacket water heat recovery attached to over 300 tons of of adsorption chillers, this combined cooling and power system provides electricity and cooling to a data center with a 1,200 kW peak electrical load. (3) Kaiser Permanente Hayward Hospital - With 180kW of Tecogen natural gas fired reciprocating engine-generators this CHP system generates steam for space heating, and hot water for a city hospital. For all sites, similar assumptions are made about the economic and technological constraints of the power generation system. Using the Distributed Energy Resource Customer Adoption Model (DER-CAM) developed at the Lawrence Berkeley National Laboratory, we model three representative scenarios and find the optimal operation scheduling, yearly energy cost, and energy technology investments for each scenario below: Scenario 1 - Diesel generators and CHP/CCHP equipment as installed in the current facility. Scenario 1 represents a baseline forced investment in currently installed energy equipment. Scenario 2 - Existing CHP equipment installed with blackout ride-through capability to replace approximately the same capacity of diesel generators. In Scenario 2 the cost of the replaced diesel units is saved, however additional capital cost for the controls and switchgear for blackout ride-through capability is necessary. Scenario 3 - Fully optimized site analysis, allowing DER-CAM to specify the number of diesel and CHP/CCHP units (with blackout ride-through capability) that should be installed ignoring any constraints on backup generation. Scenario 3 allows DER-CAM to optimize scheduling and number of generation units from the currently available technologies at a particular site. The results of this analysis, using real data to model the optimal schedulding of hypothetical and actual CHP systems for a brewery, data center, and hospital, lead to some interesting conclusions. First, facilities with high heating loads will typically prove to be the most appropriate for CHP installation from a purely economic standpoint. Second, absorption/adsorption cooling systems may only be economically feasible if the technology for these chillers can increase above current best system efficiency. At a coefficient of performance (COP) of 0.8, for instance, an adsorption chiller paired with a natural gas generator with waste heat recovery at a facility with large cooling loads, like a data center, will cost no less on a yearly basis than purchasing electricity and natural gas directly from a utility. Third, at marginal additional cost, if the reliability of CHP systems proves to be at