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1

The Potential of Elelcltric Exhaust Gas Turbocharging for HD...  

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

Elelcltric Exhaust Gas Turbocharging for HD DIesel Engines The Potential of Elelcltric Exhaust Gas Turbocharging for HD DIesel Engines 2005 Diesel Engine Emissions Reduction (DEER)...

2

Final Report on National NGV Infrastructure  

SciTech Connect (OSTI)

This report summarizes work fimded jointly by the U.S. Department of Energy (DOE) and by the Gas Research Institute (GRI) to (1) identi& barriers to establishing sustainable natural gas vehicle (NGV) infrastructure and (2) develop planning information that can help to promote a NGV infrastructure with self-sustaining critical maw. The need for this work is driven by the realization that demand for NGVS has not yet developed to a level that provides sufficient incentives for investment by the commercial sector in all necessary elements of a supportive infrastructure. The two major objectives of this project were: (1) to identifi and prioritize the technical barriers that may be impeding growth of a national NGV infrastructure and (2) to develop input that can assist industry in overcoming these barriers. The approach used in this project incorporated and built upon the accumulated insights of the NGV industry. The project was conducted in three basic phases: (1) review of the current situation, (2) prioritization of technical infrastructure btiiers, and (3) development of plans to overcome key barriers. An extensive and diverse list of barriers was obtained from direct meetings and telephone conferences with sixteen industry NGV leaders and seven Clean Cities/Clean Corridors coordinators. This information is filly documented in the appendix. A distillation of insights gained in the interview process suggests that persistent barriers to developing an NGV market and supporting infrastructure can be grouped into four major categories: 1. Fuel station economics 2. Value of NGVs from the owner/operator perspective 3. Cooperation necessary for critical mass 4. Commitment by investors. A principal conclusion is that an efficient and effective approach for overcoming technical barriers to developing an NGV infrastructure can be provided by building upon and consolidating the relevant efforts of the NGV industry and government. The major recommendation of this project is the establishment of an ad hoc NGV Infrastructure Working Group (NGV-I WG) to address the most critical technical barriers to NGV infrastructure development. This recommendation has been considered and approved by both the DOE and GRI and is the basis of continued collaboration in this area.

GM Sverdrup; JG DeSteese; ND Malcosky

1999-01-07T23:59:59.000Z

3

NGV and FCV Light Duty Transportation Perspective | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F S i DOEToward aInnovation |NEXT STEPS The next major step inNGV

4

Growth of the NGV Market:Growth of the NGV Market: Lessons LearnedLessons Learned  

E-Print Network [OSTI]

and LNG) by top niche sectors, by state and region, retail and "wholesale" #12;Data Collection Section · Investigates/evaluates potential approaches ­ State PUC filings, MVA records, excise tax records #12;Data and LNG infrastructure development to date, assess critical factors, define challenges and opportunities

5

Effects of the rotational excitation of D{sub 2} and of the potential energy surface on the H{sup +}+D{sub 2}{yields}HD+D{sup +} reaction  

SciTech Connect (OSTI)

The H{sup +}+D{sub 2}{yields}HD+D{sup +} reaction has been theoretically investigated by means of an exact quantum mechanical approach, a quasiclassical trajectory method, and two statistical methods based in the propagation of either wave functions or trajectories. The study addresses the possible changes on the overall dynamics of the title reaction when the D{sub 2} diatom is rotationally excited to its v=0, j=1 state. In addition, the reactivity for the ground rotational state on two different potential energy surfaces (PESs), namely, the surface by Aguado et al. [J. Chem. Phys. 112, 1240 (2000)] and the PES by Kamisaka et al. [J. Chem. Phys. 116, 654 (2002)], is examined. Reaction probabilities and cross sections at 0.524 and 0.1 eV collision energies are calculated. The major differences with respect to the reaction initiated with D{sub 2} in its ground rovibrational state are observed for the lowest collision energy E{sub c}=0.1 eV. Differential cross sections have been found to depend to some extend on the PES employed. In addition, at E{sub c}=0.1 eV further discrepancies in the total and rotational cross sections are noticeable.

Gonzalez-Lezana, T. [Instituto de Fisica Fundamental (CSIC), Serrano 123, 28006 Madrid (Spain); Honvault, P. [Institut UTINAM, UMR CNRS 6213 and University of Franche-Comte, Campus de la Bouloie, 25030 Besancon Cedex (France); Jambrina, P. G. [Departamento de Quimica Fisica, Facultad de Ciencias Quimicas, Universidad de Salamanca, 37008 Salamanca (Spain); Departamento de Quimica Fisica I, Facultad de Quimica, Universidad Complutense, 28040 Madrid (Spain); Aoiz, F. J. [Departamento de Quimica Fisica I, Facultad de Quimica, Universidad Complutense, 28040 Madrid (Spain); Launay, J.-M. [Institute de Physique de Rennes, UMR CNRS 6251, University of Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex (France)

2009-07-28T23:59:59.000Z

6

HD188112: Supernova Ia progenitor?  

E-Print Network [OSTI]

HD188112 is an extremely low mass white dwarf in a close binary system. According to a previous study, the mass of HD188112 is $\\sim$0.24 Msun and a lower limit of 0.73 Msun could be put for the mass of its unseen companion, a compact degenarate object. We used HST STIS spectra to measure the rotational broadening of UV metallic lines in HD188112, in order to put tighter constraints on the mass of its companion. By assuming that the system in is synchronous rotation, we derive a companion mass between 1.05 and 1.25 Msun. We also measure abundances for magnesium, silicon, and iron, respectively log $N$(X)/$N$(H) = $-$6.40, $-$7.25, and $-$5.81. The radial velocities measured from the UV spectra are found to be in very good agreement with the prediction based on the orbital parameters derived in the previous study made a decade ago.

Latour, M; Heber, U; Schaffenroth, V

2015-01-01T23:59:59.000Z

7

Discovery of pulsational line profile variations in the delta Scuti star HD21190 and in the Ap Sr star HD218994  

E-Print Network [OSTI]

Asteroseismology has the potential to provide new insights into the physics of stellar interiors. We have obtained UVES high time resolution observations of the delta Scuti star HD21190 and of the Ap Sr star HD218994 to search for pulsational line profile variations. We report the discovery of a new roAp star, HD218994, with a pulsation period of 14.2 min. This is one of the most evolved roAp stars. No rapid pulsations have been found in the spectra of the cool Ap star - delta Scuti star HD21190. However, we detect with unprecedented clarity for a delta Sct star moving peaks in the cores of spectral lines that indicate the presence of high degree non-radial pulsations in this star.

J. F. Gonzalez; S. Hubrig; D. W. Kurtz; V. Elkin; I. Savanov

2007-12-02T23:59:59.000Z

8

Fuel Efficiency of New European HD Vehicles  

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

* Realistic duty cycles, including road gradient simulation for HD trucks * Standardization of test conditions and elimination of variations * standardized test fuel (ultra...

9

Locating the planetesimals belts in the multiple-planet systems HD 128311, HD 202206, HD 82943 and HR 8799  

E-Print Network [OSTI]

In addition to the Sun, six other stars are known to harbor multiple planets and debris disks: HD 69830, HD 38529, HD 128311, HD 202206, HD 82943 and HR 8799. In this paper we set constraints on the location of the dust-producing planetesimals around the latter four systems. We use a radiative transfer model to analyze the spectral energy distributions of the dust disks (including two new Spitzer IRS spectra presented in this paper), and a dynamical model to assess the long-term stability of the planetesimals' orbits. As members of a small group of stars that show evidence of harboring a multiple planets and planetesimals, their study can help us learn about the diversity of planetary systems.

Moro-Martin, Amaya; Bryden, Geoffrey; Rieke, George H; Su, Kate Y L; Beichman, Charles A; Lawler, Samantha M

2010-01-01T23:59:59.000Z

10

Fuel economy and emissions reduction of HD hybrid truck over...  

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

economy and emissions reduction of HD hybrid truck over transient driving cycles and interstate roads Fuel economy and emissions reduction of HD hybrid truck over transient driving...

11

Advanced HD Engine Systems and Emissions Control Modeling and...  

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

HD Engine Systems and Emissions Control Modeling and Analysis Advanced HD Engine Systems and Emissions Control Modeling and Analysis 2012 DOE Hydrogen and Fuel Cells Program and...

12

Discovery of unusual pulsations in the cool, evolved Am stars HD 98851 and HD 102480  

E-Print Network [OSTI]

The chemically peculiar (CP) stars HD 98851 and HD 102480 have been discovered to be unusual pulsators during the ``Naini Tal Cape Survey'' programme to search for pulsational variability in CP stars. Time series photometric and spectroscopic observations of these newly discovered stars are reported here. Fourier analyses of the time series photometry reveal that HD 98851 is pulsating mainly with frequencies 0.208 mHz and 0.103 mHz, and HD 102480 is pulsating with frequencies 0.107 mHz, 0.156 mHz and 0.198 mHz. The frequency identifications are all subject to 1 d$^{-1}$ cycle count ambiguities. We have matched the observed low resolution spectra of HD 98851 and HD 102480 in the range 3500-7400 \\AA with theoretical synthetic spectra using Kurucz models with solar metallicity and a micro-turbulent velocity 2 km s$^{-1}$. These yield $T_{eff}=7000\\pm250$ K, log $g=3.5 \\pm 0.5$ for HD 98851 and $T_{eff} = 6750 \\pm 250$ K, log $g = 3.0 \\pm 0.5$ for HD 102480. We determined the equivalent H-line spectral class of these stars to be F1 IV and F3 III/IV, respectively. A comparison of the location of HD 98851 and HD 102480 in the HR diagram with theoretical stellar evolutionary tracks indicates that both stars are about 1-Gyr-old, 2-$M_{\\odot}$ stars that lie towards the red edge of the $\\delta$ Sct instability strip. We conclude that HD 98851 and HD 102480 are cool, evolved Am pulsators. The light curves of these pulsating stars have alternating high and low amplitudes, nearly harmonic (or sub-harmonic) period ratios, high pulsational overtones and Am spectral types. This is unusual for both Am and $\\delta$ Sct pulsators, making these stars interesting objects.

Santosh Joshi; V. Girish; R. Sagar; D. W. Kurtz; P. Martinez; B. Kumar; S. Seetha; B. N. Ashoka; A. Zhou

2003-05-20T23:59:59.000Z

13

Atmosphere, Interior, and Evolution of the Metal-Rich Transiting Planet HD 149026b  

E-Print Network [OSTI]

We investigate the atmosphere and interior of the new transiting planet HD 149026b, which appears to be very rich in heavy elements. We first compute model atmospheres at metallicities ranging from solar to ten times solar, and show how for cases with high metallicity or inefficient redistribution of energy from the day side, the planet may develop a hot stratosphere due to absorption of stellar flux by TiO and VO. The spectra predicted by these models are very different than cooler atmosphere models without stratospheres. The spectral effects are potentially detectable with the Spitzer Space Telescope. In addition the models with hot stratospheres lead to a large limb brightening, rather than darkening. We compare the atmosphere of HD 149026b to other well-known transiting planets, including the recently discovered HD 189733b, which we show have planet-to-star flux ratios twice that of HD 209458 and TrES-1. The methane abundance in the atmosphere of HD 189733b is a sensitive indicator of atmospheric temperature and metallicity and can be constrained with Spitzer IRAC observations. We then turn to interior studies of HD 149026b and use a grid of self-consistent model atmospheres and high-pressure equations of state for all components to compute thermal evolution models of the planet. We estimate that the mass of heavy elements within the planet is in the range of 60 to 93 M_earth. Finally, we discuss trends in the radii of transiting planets with metallicity in light of this new member of the class.

J. J. Fortney; D. Saumon; M. S. Marley; K. Lodders; R. S. Freedman

2006-01-03T23:59:59.000Z

14

NGV and FCV Light Duty Transportation Perspective  

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

transportation perspectives Matt Fronk, Matt Fronk & Associates, LLC 1 OctOber 2011 | ArgOnne nAtiOnAl lAbOrAtOry NG Workshop summary report - appeNDIX G 2 OctOber 2011 | ArgOnne...

15

Planetary Companions Around Two Solar Type Stars: HD 195019 and HD 217107  

E-Print Network [OSTI]

We have enlarged the sample of stars in the planet search at Lick Observatory. Doppler measurements of 82 new stars observed at Lick Observatory, with additional velocities from Keck Observatory, have revealed two new planet candidates. The G3V/IV star, HD 195019, exhibits Keplerian velocity variations with a period of 18.27 d, an orbital eccentricity of 0.03 +/- 0.03, and M sin i = 3.51 M_Jup. Based on a measurement of Ca II H&K emission, this star is chromospherically inactive. We estimate the metallicity of HD 195019 to be approximately solar from ubvy photometry. The second planet candidate was detected around HD 217107, a G7V star. This star exhibits a 7.12 d Keplerian period with eccentricity 0.14 +/- 0.05 and M sin i = 1.27 M_Jup. HD 217107 is also chromospherically inactive. The photometric metallicity is found to be [Fe/H] = +0.29 +/- 0.1 dex. Given the relatively short orbital period, the absence of tidal spin-up of HD 217107 provides a theoretical constraint on the upper limit of the companion mass of < 11 M_Jup.

D. A. Fischer; G. W. Marcy; R. P. Butler; S. S. Vogt; K. Apps

1998-10-26T23:59:59.000Z

16

Spectropolarimetric observations of the transiting planetary system of the K dwarf HD 189733  

E-Print Network [OSTI]

With a Jupiter-mass planet orbiting at a distance of only 0.031 AU, the active K2 dwarf HD 189733 is a potential candidate in which to study the magnetospheric interactions of a cool star with its recently-discovered close-orbiting giant planet. We decided to explore the strength and topology of the large-scale magnetosphere of HD 189733, as a future benchmark for quantitative studies for models of the star/planet magnetic interactions. To this end, we used ESPaDOnS, the new generation spectropolarimeter at the Canada-France-Hawaii 3.6m telescope, to look for Zeeman circular polarisation signatures in the line profiles of HD 189733 in 2006 June and August. Zeeman signatures in the line profiles of HD 189733 are clearly detected in all spectra, demonstrating that a field is indeed present at the surface of the star. The Zeeman signatures are not modulated with the planet's orbital period but apparently vary with the stellar rotation cycle. The reconstructed large-scale magnetic field, whose strength reaches a ...

Moutou, C; Savalle, R; Hussain, G; Alecian, E; Bouchy, F; Catala, C; Cameron, A Collier; Udry, S; Vidal-Madjar, A

2007-01-01T23:59:59.000Z

17

JPP-HdM p. 1/? Qu es el lgebra?  

E-Print Network [OSTI]

JPP-HdM ­ p. 9/? #12;Francois Viete (1540-1603) Introduce tres tipos de análisis: JPP-HdM ­ p. 10/? #12;Francois Viete (1540-1603) Introduce tres tipos de análisis: · Zetético: transformación de un problema en una ecuación. JPP-HdM ­ p. 11/? #12;Francois Viete (1540-1603) Introduce tres tipos de análisis

Pinasco, Juan Pablo

18

Near-infrared spectroscopy of HD the barrier to linearity  

E-Print Network [OSTI]

Near-infrared spectroscopy of HD 3 above the barrier to linearity BY JENNIFER L. GOTTFRIED, transitions of HC 3 above the barrier to linearity have been observed. A highly sensitive near-infrared-adiabatic and radiative corrections is revealed. Keywords: HD 3 ; near-infrared spectroscopy; barrier to linearity 1

Oka, Takeshi

19

HD gas analysis with Gas Chromatography and Quadrupole Mass Spectrometer  

E-Print Network [OSTI]

A gas analyzer system has been developed to analyze Hydrogen-Deuteride (HD) gas for producing frozen-spin polarized HD targets, which are used for hadron photoproduction experiments at SPring-8. Small amounts of ortho-H$_{2}$ and para-D$_{2}$ gas mixtures ($\\sim$0.01%) in the purified HD gas are a key to realize a frozen-spin polarized target. In order to obtain reliable concentrations of these gas mixtures in the HD gas, we produced a new gas analyzer system combining two independent measurements with the gas chromatography and the QMS. The para-H$_{2}$, ortho-H$_{2}$, HD, and D$_{2}$ are separated using the retention time of the gas chromatography and the mass/charge. It is found that the new gas analyzer system can measure small concentrations of $\\sim$0.01% for the otho-H$_2$ and D$_2$ with good S/N ratios.

T. Ohta; S. Bouchigny; J. -P. Didelez; M. Fujiwara; K. Fukuda; H. Kohri; T. Kunimatsu; C. Morisaki; S. Ono; G. Rouille; M. Tanaka; K. Ueda; M. Uraki; M. Utsuro; S. Y. Wang; M. Yosoi

2011-01-28T23:59:59.000Z

20

HD 51106 and HD 50747: an ellipsoidal binary and a triple system observed with CoRoT  

E-Print Network [OSTI]

We present an analysis of the observations of HD 51106 and HD 50747 by the satellite CoRoT, obtained during its initial run, and of the spectroscopic preparatory observations. AIMS: We complete an analysis of the light curve, extract the main frequencies observed, and discuss some preliminary interpretations about the stars. Methods: We used standard Fourier transform and pre-whitening methods to extract information about the periodicities of the stars. Results: HD 51106 is an ellipsoidal binary, the light curve of which can be completely explained by the tidal deformation of the star and smaller secondary effects. HD 50747 is a triple system containing a variable star, which exhibits many modes of oscillation with periods in the range of a few hours. On the basis of this period range and the analysis of the physical parameters of the star, we conclude that HD 50747 is a Gamma-Doradus star.

Dolez, N; Michel, E; Hua, A Hui Bon; Vauclair, G; Contel, D Le; Mathias, P; Poretti, E; Amado, P J; Rainer, M; Samadi, R; Baglin, A; Catala, C; Auvergne, M; Uytterhoeven, K; Valtier, J C

2009-01-01T23:59:59.000Z

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


21

Capturing Video Using the SONY GV-HD700 Cassette Deck In the AV Production Room (Room 261), Mann Library has a SONY GV-HD700 Digital HD Video  

E-Print Network [OSTI]

Capturing Video Using the SONY GV-HD700 Cassette Deck In the AV Production Room (Room 261), Mann Library has a SONY GV-HD700 Digital HD Video Cassette Deck. It is attached to the left side Mac Pro

Angenent, Lars T.

22

A Flared, Orbiting, Dusty Disk Around HD 233517  

E-Print Network [OSTI]

We find that the infrared excess around HD 233517, a first ascent red giant, can be naturally explained if the star possesses an orbiting, flared dusty disk. We estimate that the outer radius of this disk is 45 AU and that the total mass within the disk is about 0.01 the mass of the Sun. We speculate that this disk is the result of the engulfment of a low mass companion star that occurred when HD 233517 became a red giant.

M. Jura

2002-09-13T23:59:59.000Z

23

Orbital configurations and dynamical stability of multi-planet systems around Sun-like stars HD 202206, 14 Her, HD 37124 and HD 108874  

E-Print Network [OSTI]

We perform a dynamical analysis of the recently published radial velocity (RV) measurements of a few solar type stars which host multiple Jupiter-like planets. In particular, we re-analyze the data for HD 202206, 14 Her, HD 37124 and HD 108874. We derive dynamically stable configurations which reproduce the observed RV signals using our method called GAMP (an acronym of the Genetic Algorithm with MEGNO Penalty). The GAMP relies on the N-body dynamics and makes use of genetic algorithms merged with a stability criterion. For this purpose, we use the maximal Lyapunov exponent computed with the dynamical fast indicator MEGNO. Through a dynamical analysis of the phase-space in a neighborhood of the obtained best-fit solutions, we derive meaningful limits on the parameters of the planets. We demonstrate that GAMP is especially well suited for the analysis of the RV data which only partially cover the longest orbital period and/or correspond to multi-planet configurations involved in low-order mean motion resonances (MMRs). In particular, our analysis reveals a presence of a second Jupiter-like planet in the 14 Her system (14 Her c) involved in a 3:1 or 6:1 MMR with the known companion b. We also show that the dynamics of the HD 202206 system may be qualitatively different when coplanar and mutually-inclined orbits of the companions are considered. We demonstrate that the two outer planets in the HD 37124 system may reside in a close neighborhood of the 5:2 MMR. Finally, we found a clear indication that the HD 108874 system may be very close to, or locked in an exact 4:1 MMR.

Krzysztof Gozdziewski; Maciej Konacki; Andrzej J. maciejewski

2005-11-15T23:59:59.000Z

24

Collision energy dependence of the HD,, 2... product rotational distribution of the HD2 reaction in the range 1.301.89 eV  

E-Print Network [OSTI]

Collision energy dependence of the HD,, ?2... product rotational distribution of the H¿D2 reaction of the collision energy dependence of the HD( 2,j ) rotational product state distribution for the H D2 reaction­26 to probe the products of the reaction. Recently, we measured the energy dependence of the HD( 3,j ) product

Zare, Richard N.

25

Contribution of HD molecules in cooling of the primordial gas  

E-Print Network [OSTI]

We study the effects of HD molecules on thermochemical evolution of the primordial gas behind shock waves, possibly arised in the process of galaxy formation. We find the critical shock velocity when deuterium transforms efficiently into HD molecules which then dominate gas cooling. Above this velocity the shocked gas is able to cool down to the temperature of the cosmic microwave background. Under these conditions the corresponding Jeans mass depends only on redshift and initial density of baryons $M_J \\propto \\delta_c^{-0.5} (1+z)^{0.5}$. At $z\\simgt 45$ HD molecules heat shocked gas, and at larger redshift their contribution to thermal evolution becomes negligible.

E. O. Vasiliev; Yu. A. Shchekinov

2005-07-26T23:59:59.000Z

26

On-Road Particle Matter Emissions from a MY 2010 Compliant HD...  

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

Particle Matter Emissions from a MY 2010 Compliant HD Diesel Vehicle Driving Across the U.S. On-Road Particle Matter Emissions from a MY 2010 Compliant HD Diesel Vehicle Driving...

27

Calibraton of a Directly Injected Natural Gas HD Engine for Class...  

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

Calibraton of a Directly Injected Natural Gas HD Engine for Class 8 Truck Applications Calibraton of a Directly Injected Natural Gas HD Engine for Class 8 Truck Applications This...

28

E-Print Network 3.0 - ae star hd Sample Search Results  

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

field measurements of the Herbig Ae stars HD 101412 (left panel) and HD 150193 (right panel) (FORS 2... cool stars and solar-like stars Instrumentation The most successful...

29

E-Print Network 3.0 - ae star hd101412 Sample Search Results  

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

field measurements of the Herbig Ae stars HD 101412 (left panel) and HD 150193 (right panel) (FORS 2... cool stars and solar-like stars Instrumentation The most successful...

30

Hydrogen Bonding, H-D Exchange, and Molecular Mobility in Thin...  

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

Bonding, H-D Exchange, and Molecular Mobility in Thin Water Films on TiO2(110). Hydrogen Bonding, H-D Exchange, and Molecular Mobility in Thin Water Films on TiO2(110). Abstract:...

31

Arabidopsis thaliana histone deacetylase 1 (AtHD1) and epigenetic regulation  

E-Print Network [OSTI]

deacetylase 1 (CASH) transgenic plants. AtHD1 is a homolog of RPD3 protein, a global transcriptional regulator in yeast. Expression of the antisense AtHD1 caused dramatic reduction in endogenous AtHD1 transcription, resulting in accumulation of acetylated...

Tian, Lu

2004-09-30T23:59:59.000Z

32

One solution for cloning and mutagenesis: In-Fusion HD Cloning Plus  

E-Print Network [OSTI]

One solution for cloning and mutagenesis: In-Fusion® HD Cloning Plus We describe in this editiona substitutions and base insertions. In-Fusion HD* Cloning Plus is sequence independent, seamless, directional can be carried out by combining the strength of the In-Fusion HD enzyme with inverse PCR. Introduction

Cai, Long

33

The Successful Prediction of the Extrasolar Planet HD 74156 d  

E-Print Network [OSTI]

Most of the first-discovered extrasolar multi-planet systems were found to lie close to dynamically unstable configurations. However a few observed multi-planet systems (e.g. HD 74156) did not show this trait. Those systems could share this property if they contain an additional planet in between those that are known. Previous investigations identified the properties of hypothetical planets that would place these systems near instability. The hypothetical planet in HD 74156 was expected to have a mass about equal to that of Saturn, a semi-major axis between 0.9 and 1.4 AU, and an eccentricity less than 0.2. HD 74156 d, a planet with a mass of 1.3 Saturn masses at 1.04 AU with an eccentricity of 0.25, was recently announced. We have reanalyzed all published data on this system in order to place tighter constraints on the properties of the new planet. We find two possible orbits for this planet, one close to that already identified and another (with a slightly better fit to the data) at ~0.89 AU. We also review the current status of other planet predictions, discuss the observed single planet systems, and suggest other systems which may contain planets in between those that are already known. The confirmation of the existence of HD 74156 d suggests that planet formation is an efficient process, and planetary systems should typically contain many planets.

Rory Barnes; Krzysztof Gozdziewski; Sean N. Raymond

2008-04-28T23:59:59.000Z

34

THE DISCOVERY OF HD 37605c AND A DISPOSITIVE NULL DETECTION OF TRANSITS OF HD 37605b  

SciTech Connect (OSTI)

We report the radial velocity discovery of a second planetary mass companion to the K0 V star HD 37605, which was already known to host an eccentric, P {approx} 55 days Jovian planet, HD 37605b. This second planet, HD 37605c, has a period of {approx}7.5 years with a low eccentricity and an Msin i of {approx}3.4 M{sub Jup}. Our discovery was made with the nearly 8 years of radial velocity follow-up at the Hobby-Eberly Telescope and Keck Observatory, including observations made as part of the Transit Ephemeris Refinement and Monitoring Survey effort to provide precise ephemerides to long-period planets for transit follow-up. With a total of 137 radial velocity observations covering almost 8 years, we provide a good orbital solution of the HD 37605 system, and a precise transit ephemeris for HD 37605b. Our dynamic analysis reveals very minimal planet-planet interaction and an insignificant transit time variation. Using the predicted ephemeris, we performed a transit search for HD 37605b with the photometric data taken by the T12 0.8 m Automatic Photoelectric Telescope (APT) and the MOST satellite. Though the APT photometry did not capture the transit window, it characterized the stellar activity of HD 37605, which is consistent of it being an old, inactive star, with a tentative rotation period of 57.67 days. The MOST photometry enabled us to report a dispositive null detection of a non-grazing transit for this planet. Within the predicted transit window, we exclude an edge-on predicted depth of 1.9% at the >>10{sigma} level, and exclude any transit with an impact parameter b > 0.951 at greater than 5{sigma}. We present the BOOTTRAN package for calculating Keplerian orbital parameter uncertainties via bootstrapping. We made a comparison and found consistency between our orbital fit parameters calculated by the RVLIN package and error bars by BOOTTRAN with those produced by a Bayesian analysis using MCMC.

Wang, Sharon Xuesong; Wright, Jason T.; Mahadevan, Suvrath [Department of Astronomy and Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA 16802 (United States); Cochran, William; Endl, Michael; MacQueen, Phillip J. [McDonald Observatory, University of Texas, Austin, TX 78712 (United States); Kane, Stephen R.; Von Braun, Kaspar [NASA Exoplanet Science Institute, Caltech, MS 100-22, 770 South Wilson Avenue, Pasadena, CA 91125 (United States); Henry, Gregory W. [Center of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Boulevard, Box 9501, Nashville, TN 37209 (United States); Payne, Matthew J.; Ford, Eric B. [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, P.O. Box 112055, Gainesville, FL 32611 (United States); Valenti, Jeff A. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Antoci, Victoria; Dragomir, Diana; Matthews, Jaymie M. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T1Z1 (Canada); Howard, Andrew W.; Marcy, Geoffrey W.; Isaacson, Howard, E-mail: xxw131@psu.edu, E-mail: jtwright@astro.psu.edu [Department of Astronomy, University of California, Berkeley, CA 94720 (United States)

2012-12-10T23:59:59.000Z

35

Developmentof the 15 T Nb3Sn dipole HD2  

SciTech Connect (OSTI)

The Superconducting Magnet Program at Lawrence Berkeley National Laboratory (LBNL) is continuing the development of HD2, a 1 m long Nb{sub 3}Sn dipole generating a dipole field of 15 T in a 36 mm clear bore. With tilted (flared) ends to avoid obstructing the beam path, HD2 represents a step towards the development of cost effective accelerator quality magnets. The design has been optimized to minimize geometric harmonics and to address iron saturation and conductor magnetization effects. The support structure is based on an external aluminum shell, pre-tensioned with pressurized bladders and interference keys. Aluminum axial rods and stainless steel end plates provide longitudinal support to the coil ends during magnet excitation. This paper reports on field quality optimization and magnet parameters. The design and fabrication of the coil and structure components, and results from coil winding, reaction, and potting are also presented.

Caspi, S.; Cheng, D.W.; Dietderich, D.R.; Hafalia, A.R.; Hannaford, C.R.; Higley, H.; Lietzke, A.F.; Lizarazo, J.; McInturff, A.D.; Sabbi, G.; Ferracin, P.

2008-06-01T23:59:59.000Z

36

The chemical abundances of the Ap star HD94660  

SciTech Connect (OSTI)

In this work I present the determination of chemical abundances of the Ap star HD94660, a possible rapid oscillating star. As all the magnetic chemically peculiar objects, it presents CNO underabundance and overabundance of iron peak elements of ?100 times and of rare earths up to 4 dex with respect to the Sun. The determination was based on the conversion of the observed equivalent widths into abundances simultaneously to the determination of effective temperature and gravity. Since the Balmer lines of early type stars are very sensitive to the surface gravity while the flux distribution is sensitive to the effective temperature, I have adopted an iterative procedure to match the H{sub ?} line profile and the observed UV-Vis-NIR magnitudes of HD94660 looking for a consistency between the metallicity of the atmosphere model and the derived abundances. From my spectroscopic analysis, this star belongs to the no-rapid oscillating class.

Giarrusso, M. [Universit di Catania, Dipartimento di Fisica e Astronomia, Sezione Astrofisica, Via S. Sofia 78, 95123 Catania (Italy); INAF - Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania (Italy); INFN - Laboratori Nazionali del Sud (Italy)

2014-05-09T23:59:59.000Z

37

The dust, planetesimals and planets of HD 38529  

E-Print Network [OSTI]

HD 38529 is a post-main sequence G8III/IV star (3.5 Gyr old) with a planetary system consisting of at least two planets having Msin(i) of 0.8 MJup and 12.2 MJup, semimajor axes of 0.13 AU and 3.74 AU, and eccentricities of 0.25 and 0.35, respectively. Spitzer observations show that HD 38529 has an excess emission above the stellar photosphere, with a signal-to-noise ratio (S/N) at 70 micron of 4.7, a small excess at 33 micron (S/N=2.6) and no excess model the spectral energy distribution of HD 38529 to find out which of these niches show signs of harboring dust-producing plantesimals. The secular analysis, together with the SED modeling resuls, suggest that the planetesimals responsible for most of the dust emission are likely located within 20-50 AU, a configuration that resembles that of the Jovian planets + Kuiper Belt in our Solar System. Finally, we place upper limits (8E-6 lunar masses of 10 micron particles) to the amount of dust that could be located in the dynamically stable region that exists between the two planets (0.25--0.75 AU).

Amaya Moro-Martin; Renu Malhotra; John M. Carpenter; Lynne A. Hillenbrand; Sebastian Wolf; Michael R. Meyer; David Hollenbach; Joan Najita; Thomas Henning

2007-06-22T23:59:59.000Z

38

Growth of the NGV Market: Lessons Learned Roadmap for Infrastructure  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeatMulti-Dimensional Subject:Ground Source Heat Pump SubprogramDepartmentDevelopment |

39

MD/HD Advanced Technology Evaluations | 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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector General Office0-72.pdfGeorgeDoesn't HappenLow-Cost Production ofModelingfor theMACCS2ofMD/HD

40

CFN | Hitachi HD2700C Scanning Transmission Electron Microscope  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed New Substation Sites Proposed Route SegmentsCleanNanofabricationHitachi HD2700C

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


41

Refined Properties of the HD 130322 Planetary System  

E-Print Network [OSTI]

Exoplanetary systems closest to the Sun, with the brightest host stars, provide the most favorable opportunities for characterization studies of the host star and their planet(s). The Transit Ephemeris Refinement and Monitoring Survey uses both new radial velocity measurements and photometry in order to greatly improve planetary orbit uncertainties and the fundamental properties of the star, in this case HD 130322. The only companion, HD 130322b, orbits in a relatively circular orbit, e = 0.029 every ~10.7 days. Radial velocity measurements from multiple sources, including 12 unpublished from the Keck I telescope, over the course of ~14 years have reduced the uncertainty in the transit midpoint to ~2 hours. The transit probability for the b-companion is 4.7%, where M_p sin i = 1.15 M_J and a = 0.0925 AU. In this paper, we compile photometric data from the T11 0.8m Automated Photoelectric Telescope at Fairborn Observatory taken over ~14 years, including the constrained transit window, which results in a dispos...

Hinkel, Natalie R; Henry, Gregory W; Feng, Y Katherina; Boyajian, Tabetha; Wright, Jason; Fischer, Debra A; Howard, Andrew W

2015-01-01T23:59:59.000Z

42

Helium stratification in HD 145792: a new Helium strong star  

E-Print Network [OSTI]

In this paper we report on the real nature of the star HD 145792, classified as He weak in {\\it ``The General Catalogue of Ap and Am stars''}. By means of FEROS@ESO1.52m high resolution spectroscopic data, we refined the atmospheric parameters of the star, obtaining: T$_{\\rm eff}$ = 14400 $\\pm$ 400 K, $\\log g$ = 4.06 $\\pm$ 0.08 and $\\xi$ = 0 $^{+0.6}$ km s$^{-1}$. These values resulted always lower than those derived by different authors with pure photometric approaches. Using our values we undertook an abundance analysis with the aim to derive, for the first time, the chemical pattern of the star's atmosphere. For metals a pure LTE synthesis (ATLAS9 and SYNTHE) has been used, while for helium a hybrid approach has been preferred (ATLAS9 and SYNSPEC). The principal result of our study is that HD 145792 belongs to He strong class contrary to the previous classification. Moreover, helium seems to be vertically stratified in the atmosphere, decreasing toward deepest layers. For what that concerns metals abundances, we found the following: overabundance of oxygen, neon, silicon, phosphorus, sulfur and calcium; carbon, nitrogen, magnesium, aluminum, titanium, chromium and nickel are normal, being the discrepancies from the solar values within the experimental errors; iron resulted to be slightly underabundant.

G. Catanzaro

2007-11-28T23:59:59.000Z

43

THE NEARBY, YOUNG, ISOLATED, DUSTY STAR HD 166191  

SciTech Connect (OSTI)

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

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

2013-11-01T23:59:59.000Z

44

Mid-InfraRed imaging of the circumstellar dust around three Herbig Ae stars : HD135344, CQTau, HD163296  

E-Print Network [OSTI]

Planet formation has been known for many years to be tied to the spatial distribution of gas and dust in disks around young stars. To constrain planet formation models, imaging observations of protoplanetary disks are required. In this framework, we have undertaken a mid-infrared imaging survey of Herbig Ae stars, which are pre-main sequence stars of intermediate mass still surrounded by a large amount of circumstellar material. The observations were made at a wavelength of 20.5 $\\mu$m with the CAMIRAS camera mounted at the Cassegrain focus of the Canada France Hawaii Telescope. We report the observations of three stars, HD135344, CQTau and HD163296. The circumstellar material around the three objects is spatially resolved. The extensions feature a disk like shape. The images provide direct information on two key parameters of the disk : its inclination and its outer radius. The outer radius is found to be quite different from the one deduced from disk models only constrained by fitting the Spectral Energy Distribution of the object. Other parameters of the disk, such as flaring, dust mass have been deduced from fitting both the observed extension and the spectral energy distribution with sophisticated disk models. Our results show how important imaging data are to tighten constraints on the disk model parameters.

C. Doucet; E. Pantin; P. O. Lagage; C. P. Dullemond

2006-08-29T23:59:59.000Z

45

Is the X-ray pulsating companion of HD 49798 a possible type Ia supernova progenitor?  

E-Print Network [OSTI]

HD 49798 (a hydrogen depleted subdwarf O6 star) with its massive white dwarf (WD) companion has been suggested to be a progenitor candidate of type Ia supernovae (SNe Ia). However, it is still uncertain whether the companion of HD 49798 is a carbon-oxygen (CO) WD or an oxygen-neon (ONe) WD. A CO WD will explode as an SN Ia when its mass grows approach to Chandrasekhar mass, while the outcome of an accreting ONe WD is likely to be a neutron star. We followed a series of Monte Carlo binary population synthesis approach to simulate the formation of ONe WD + He star systems. We found that there is almost no orbital period as large as HD 49798 with its WD companion in these ONe WD + He star systems based on our simulations, which means that the companion of HD 49798 might not be an ONe WD. We suggest that the companion of HD 49798 is most likely a CO WD, which can be expected to increase its mass to the Chandrasekhar mass limit by accreting He-rich material from HD 49798. Thus, HD 49798 with its companion may prod...

Liu, Dong-Dong; Wu, Cheng-Yuan; Wang, Bo

2015-01-01T23:59:59.000Z

46

E-Print Network 3.0 - ap star hd Sample Search Results  

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

search results for: ap star hd Page: << < 1 2 3 4 5 > >> 1 arXiv:astroph0405348 Astronomy & Astrophysics manuscript no. OstarsCat October 21, 2004 Summary: of the field O...

47

NEAR-INFRARED TRANSIT PHOTOMETRY OF THE EXOPLANET HD 149026b  

E-Print Network [OSTI]

The transiting exoplanet HD 149026b is an important case for theories of planet formation and planetary structure, for the planet's relatively small size has been interpreted as evidence for a highly metal-enriched ...

Carter, Joshua Adam

48

Optical Albedo Theory of Strongly-Irradiated Giant Planets: The Case of HD 209458b  

E-Print Network [OSTI]

We calculate a new suite of albedo models for close-in extrasolar giant planets and compare with the recent stringent upper limit for HD 209458b of Rowe et al. using MOST. We find that all models without scattering clouds are consistent with this optical limit. We explore the dependence on wavelength and waveband, metallicity, the degree of heat redistribution, and the possible presence of thermal inversions and find a rich diversity of behaviors. Measurements of transiting extrasolar giant planets (EGPs) at short wavelengths by MOST, Kepler, and CoRoT, as well as by proposed dedicated multi-band missions, can complement measurements in the near- and mid-IR using {\\it Spitzer} and JWST. Collectively, such measurements can help determine metallicity, compositions, atmospheric temperatures, and the cause of thermal inversions (when they arise) for EGPs with a broad range of radii, masses, degrees of stellar insolation, and ages. With this paper, we reappraise and highlight the diagnostic potential of albedo measurements of hot EGPs shortward of $\\sim$1.3 $\\mu$m.

A. Burrows; L. Ibgui; I. Hubeny

2008-05-04T23:59:59.000Z

49

Thermal H/D exchange in polar ice - deuteron scrambling in space  

E-Print Network [OSTI]

We have investigated the thermally induced proton/deuteron exchange in mixed amorphous H$_2$O:D$_2$O ices by monitoring the change in intensity of characteristic vibrational bending modes of H$_2$O, HDO, and D$_2$O with time and as function of temperature. The experiments have been performed using an ultra-high vacuum setup equipped with an infrared spectrometer that is used to investigate the spectral evolution of homogeneously mixed ice upon co-deposition in thin films, for temperatures in the 90 to 140 K domain. With this non-energetic detection method we find a significantly lower activation energy for H/D exchange -- $3840 \\pm 125$ K -- than previously reported. Very likely this is due to the amorphous nature of the interstellar ice analogues involved. This provides reactive timescales ($\\tau70$ K) fast enough for the process to be important in interstellar environments. Consequently, an astronomical detection of D$_2$O will be even more challenging because of its potential to react with H$_2$O to form H...

Lamberts, Thanja; Cuppen, Herma; Fedoseev, Gleb; Linnartz, Harold

2015-01-01T23:59:59.000Z

50

Ground-based NIR emission spectroscopy of HD189733b  

E-Print Network [OSTI]

Spectroscopic observations of transiting exoplanets are providing an unprecedented view of the atmospheres of planets around nearby stars. As we learn more about the atmospheres of these remote bodies, we begin to build up a clearer picture of their composition and thermal structure. Here we investigate the case of K and L band emissions of the hot-Jupiter HD 189733b. Using the SpeX instrument on the NASA IRTF, we obtained three nights of secondary eclipse data using equivalent settings for all nights. Our sample includes one night previously presented by Swain et al. (2010) which allows for comparability of results. In this publication we present and discuss in detail a greatly improved data-reduction and analysis routine. This, in conjunction with more data, allows us to increase the spectral resolution of our planetary spectrum (R ~ 170-180), leading to a better identifiability of the features present. We confirm the existence of a strong emission at ~3.3 microns which is inconsistent with LTE simulations ...

Waldmann, I P; Tinetti, G; Griffith, C A; Swain, M R; Deroo, P

2011-01-01T23:59:59.000Z

51

The Potential of Elelcltric Exhaust Gas Turbocharging for HD DIesel Engines  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage »of EnergyThe Energy Department Feeds11,IndustrialDepartmentThe Planet|

52

The CORALIE survey for southern extra-solar planets VII. Two short-period Saturnian companions to HD108147 and HD168746  

E-Print Network [OSTI]

We present the discovery of two Saturn-mass companions to HD108147 and HD168746. Both belong to the lightest ever discovered planets. The minimum mass of the companion to HD168746 is of only 0.77 the mass of Saturn and its orbital period is 6.4 days. The companion to HD108147 orbits its parent star in 10.9 days and its minimum mass is 1.34 that of Saturn. Its orbit is characterized by a high eccentricity, e=0.50, indicating possibly the presence of a second companion. The detection of Saturn-mass planets by means of the Doppler technique demands high radial-velocity measurement precision. The two new candidates were discovered by means of the CORALIE echelle spectrograph. The instrumental accuracy of CORALIE combined with the simultaneous ThAr-reference technique has reached a level better than 3m/s. On many observed objects the precision is now limited by photon noise. We present in this paper the weighted cross-correlation technique, which leads to an improvement in the photon noise of the computed radial velocity. We discuss as well a modification of the numerical cross-correlation mask which reduces significantly the residual perturbation effects produced by telluric absorption lines.

F. Pepe; M. Mayor; F. Galland; D. Naef; D. Queloz; N. C. Santos; S. Udry; M. Burnet

2002-02-25T23:59:59.000Z

53

Atomic and molecular interstellar absorption lines toward the high galactic latitude stars HD~141569 and HD~157841 at ultra-high resolution  

E-Print Network [OSTI]

We present ultra-high resolution (0.32 km/s) spectra obtained with the 3.9m Anglo-Australian Telescope (AAT) and Ultra-High-Resolution Facility (UHRF), of interstellar NaI D1, D2, Ca II K, K I and CH absorption toward two high galactic latitude stars HD141569 and HD157841. We have compared our data with 21-cm observations obtained from the Leiden/Dwingeloo HI survey. We derive the velocity structure, column densities of the clouds represented by the various components and identify the clouds with ISM structures seen in the region at other wavelengths. We further derive abundances, linear depletions and H2 fractional abundances for these clouds, wherever possible. Toward HD141569, we detect two components in our UHRF spectra : a weak, broad component at - 15 km/s, seen only in CaII K absorption and another component at 0 km/s, seen in NaI D1, D2, Ca II K, KI and CH absorption. In the case of the HD157841 sightline, a total of 6 components are seen on our UHRF spectra in NaI D1, D2 Ca II K, K I and CH absorption. 2 of these 6 components are seen only in a single species.

M. S. Sahu; J. C. Blades; L. He; D. Hartmann; M. J. Barlow; I. A. Crawford

1998-03-31T23:59:59.000Z

54

The CORALIE survey for southern extra-solar planets XV. Discovery of two eccentric planets orbiting HD4113 and HD156846  

E-Print Network [OSTI]

We report the detection of two very eccentric planets orbiting HD4113 and HD156846 with the CORALIE Echelle spectrograph mounted on the 1.2-m Euler Swiss telescope at La Silla. The first planet, HD4113b, has minimum mass of $m\\sin{i}=1.6\\pm0.2 M_{\\rm Jup}$, a period of $P=526.59\\pm0.21$ days and an eccentricity of $e=0.903\\pm0.02$. It orbits a metal rich G5V star at $a=1.28$ AU which displays an additional radial velocity drift of 28 m s$^{-1}$/yr observed during 8 years. The combination of the radial-velocity data and the non-detection of any main sequence stellar companion in our high contrast images taken at the VLT with NACO/SDI, characterizes the companion as a probable brown dwarf or as a faint white dwarf. The second planet, \\object{HD 156846 b}, has minimum mass of $m\\sin{i}=10.45\\pm0.05$ M$_{\\rm Jup}$, a period of $P=359.51\\pm0.09 $ days, an eccentricity of $e=0.847\\pm0.002$ and is located at $a=1.0$ AU from its parent star. HD156846 is a metal rich G0 dwarf and is also the primary of a wide binary system ($a>250$ AU, $P>4000$ years). Its stellar companion, \\object{IDS 17147-1914 B}, is a M4 dwarf. The very high eccentricities of both planets can be explained by Kozai oscillations induced by the presence of a third object.

O. Tamuz; D. Sgransan; S. Udry; M. Mayor; A. Eggenberger; D. Naef; F. Pepe; D. Queloz; N. C. Santos; B. -O. Demory; P. Figuera; M. Marmier; G. Montagnier

2007-10-26T23:59:59.000Z

55

A portable cryostat for the cold transfer of polarized solid HD targets: HDice-I  

SciTech Connect (OSTI)

A device has been developed with moveable liquid nitrogen and liquid helium volumes that is capable of reaching over two meters into the coldest regions of a cryostat or dilution refrigerator and reliably extracting or installing a target of solid, polarized hydrogen deuteride (HD). This Transfer Cryostat incorporates a cylindrical neodymium rare-earth magnet that is configured as a Halbach dipole, which is maintained at 77 K and produces a 0.1 T field around the HD target. Multiple layers provide a hermetic 77 K-shield as the device is used to maintain a target at 2 K during a transfer between cryostats. Tests with frozen-spin HD show negligible polarization loss for either H or D over typical transfer periods. Multiple target transfers with this apparatus have shown an overall reliability of about 95% per transfer, which is a significant improvement over earlier versions of the device.

Bass, Christopher D. [JLAB, Newport News, VA (United States); Sandorfi, Andy M. [JLAB, Newport News, VA (United States); Bade, C.; Blecher, M.; Caracappa, A.; D'Angelo, A.; Deur, A.; Dezern, G.; Glueckler, H.; Hanretty, C.; Ho, D.; Kageya, T.; Khandaker, M.; Laine, V.; Lincoln, F.; Lowry, M. M.; Mahon, J. C.; Connell, T. O.; Peng, P.; Preedom, B.; Seyfarth, H.; Stroeher, H.; Thorn, C. E.; Wei, X.; Whisnant, C. S.

2014-02-01T23:59:59.000Z

56

First optical images of circumstellar dust surrounding the debris disk candidate HD 32297  

E-Print Network [OSTI]

Near-infrared imaging with the Hubble Space Telescope recently revealed a circumstellar dust disk around the A star HD 32297. Dust scattered light is detected as far as 400 AU radius and the linear morphology is consistent with a disk ~10 degrees away from an edge-on orientation. Here we present the first optical images that show the dust scattered light morphology from 560 to 1680 AU radius. The position angle of the putative disk midplane diverges by 31 degrees and the color of dust scattering is most likely blue. We associate HD 32297 with a wall of interstellar gas and the enigmatic region south of the Taurus molecular cloud. We propose that the extreme asymmetries and blue disk color originate from a collision with a clump of interstellar material as HD 32297 moves southward, and discuss evidence consistent with an age of 30 Myr or younger.

P. Kalas

2005-11-08T23:59:59.000Z

57

Temperature Dependence of Scott Thermomagnetic Torque in N2, Ch4, and Hd  

E-Print Network [OSTI]

10 '&D&2x10 ', B. Gosse (private communica- tion). PHYSIC AL REVIEW A VO LUME 6, NUMBER 1 JULY 1972 Temperature Dependence of the Scott Thermomagnetic Torque in N, , CH4, and HD T. W. Adair, III Department of Physics, Texas A@M University..., College Station, Texas 77843 (Received 20 December 1971) The temperature dependence of the Scott thermomagnetic torque has been measured in N2, CH4, and HD. Measurements were made from a temperature of 75 up to 300'K, from a pres- sure of 0.003 up to 1...

Adair, Thomas W.

1972-01-01T23:59:59.000Z

58

FURTHER EVIDENCE OF THE PLANETARY NATURE OF HD 95086 b FROM GEMINI/NICI H-BAND DATA  

SciTech Connect (OSTI)

We present our analysis of the Gemini/NICI H-band data of HD 95086, following the discovery of the planet HD 95086 b in L'. The H-band data reach a contrast of 12.7 mag relative to the host star at 5? levels in the location of HD 95086 b, and no point source is found. Our non-detection and H L' color limit rules out the possibility that the object is a foreground L/T dwarf and that, if it is bound to HD 95086, it is a genuine planetary mass object. We estimate a new pre-main-sequence isochronal age for HD 95086 of 17 4 Myr, which is commensurate with previous mean age estimates for the Lower Cen-Crux subgroup. Adopting an age of 17 Myr, the color limit is inconsistent with the COND model, marginally consistent with the BT-SETTL model, and consistent with the DUSTY model.

Meshkat, T.; Kenworthy, M. [Sterrewacht Leiden, P.O. Box 9513, Niels Bohrweg 2, 2300 RA Leiden (Netherlands)] [Sterrewacht Leiden, P.O. Box 9513, Niels Bohrweg 2, 2300 RA Leiden (Netherlands); Bailey, V.; Su, K. Y. L. [Steward Observatory, Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065 (United States)] [Steward Observatory, Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065 (United States); Rameau, J.; Chauvin, G.; Lagrange, A.-M. [UJF-Grenoble 1/CNRS-INSU, Institut de Plantologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble, F-38041 (France)] [UJF-Grenoble 1/CNRS-INSU, Institut de Plantologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble, F-38041 (France); Bonnefoy, M. [Max Planck Institute fr Astronomy, Knigsthul 17, D-69117 Heidelberg (Germany)] [Max Planck Institute fr Astronomy, Knigsthul 17, D-69117 Heidelberg (Germany); Boccaletti, A. [LESIA, Observatoire de Paris, CNRS, University Pierre et Marie Curie Paris 6 and University Denis Diderot Paris 7, 5 place Jules Janssen, F-92195 Meudon (France)] [LESIA, Observatoire de Paris, CNRS, University Pierre et Marie Curie Paris 6 and University Denis Diderot Paris 7, 5 place Jules Janssen, F-92195 Meudon (France); Mamajek, E. E. [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171 (United States)] [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171 (United States); Currie, T. [Department of Astronomy and Astrophysics, University of Toronto, 50 St. George St., Toronto, Ontario, M5S 1A1 (Canada)] [Department of Astronomy and Astrophysics, University of Toronto, 50 St. George St., Toronto, Ontario, M5S 1A1 (Canada)

2013-10-01T23:59:59.000Z

59

CONSTRAINTS ON THE FORMATION OF THE PLANET IN HD 188753 Hannah Jang-Condell  

E-Print Network [OSTI]

for planet formation. In this paper we attempt to model a protoplanetary disk around HD 188753A using around an iso- lated star, these models provide good fits to observed spectral energy distributions (SEDs that planet formation cannot occur in the more quiescent -disk model puts a strong constraint on planet

60

THE TRANSIT INGRESS AND THE TILTED ORBIT OF THE EXTRAORDINARILY ECCENTRIC EXOPLANET HD 80606b  

E-Print Network [OSTI]

We present the results of a transcontinental campaign to observe the 2009 June 5 transit of the exoplanet HD 80606b. We report the first detection of the transit ingress, revealing the transit duration to be 11.64 0.25 ...

Adams, Elisabeth Rose

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


61

THE TRENDS HIGH-CONTRAST IMAGING SURVEY. III. A FAINT WHITE DWARF COMPANION ORBITING HD 114174  

SciTech Connect (OSTI)

The nearby Sun-like star HD 114174 exhibits a strong and persistent Doppler acceleration indicating the presence of an unseen distant companion. We have acquired high-contrast imaging observations of this star using NIRC2 at Keck and report the direct detection of the body responsible for causing the ''trend''. HD 114174 B has a projected separation of 692 {+-} 9 mas (18.1 AU) and is 10.75 {+-} 0.12 mag (contrast of 5 Multiplication-Sign 10{sup -5}) fainter than its host in the K-band, requiring aggressive point-spread function subtraction to identify. Our astrometric time baseline of 1.4 yr demonstrates physical association through common proper motion. We find that the companion has absolute magnitude, M{sub J} = 13.97 {+-} 0.11, and colors, J - K = 0.12 {+-} 0.16 mag. These characteristics are consistent with an Almost-Equal-To T3 dwarf, initially leading us to believe that HD 114174 B was a substellar object. However, a dynamical analysis that combines radial velocity measurements with available imaging data indicates a minimum mass of 0.260 {+-} 0.010 M{sub Sun }. We conclude that HD 114174 B must be a white dwarf. Assuming a hydrogen-rich composition, atmospheric and evolutionary model fits yield an effective temperature T{sub eff} = 8200 {+-} 4000 K, surface gravity log g = 8.90 {+-} 0.02, and cooling age of t{sub c} Almost-Equal-To 3.4 Gyr, which is consistent with the 4.7{sup +2.3}{sub -2.6} Gyr host star isochronal age estimate. HD 114174 B is a benchmark object located only 26.14 {+-} 0.37 pc from the Sun. It may be studied at a level of detail comparable to Sirius and Procyon, and used to understand the link between the mass of white dwarf remnants with that of their progenitors.

Crepp, Justin R. [Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556 (United States); Johnson, John Asher [Department of Planetary Science, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (United States); Howard, Andrew W. [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); Marcy, Geoffrey W. [Department of Astronomy, University of California, Berkeley, CA 94720 (United States); Gianninas, Alexandros; Kilic, Mukremin [Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 (United States); Wright, Jason T., E-mail: jcrepp@nd.edu [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)

2013-09-01T23:59:59.000Z

62

HD gas purification for polarized HDice targets production at Jefferson Lab  

SciTech Connect (OSTI)

Solid, frozen-spin targets of molecular HD were #12;rst developed for nuclear physics by a collaboration between Syracuse University and Brookhaven National Lab. They have been successfully used in measurements with photon beams, #12;rst at the Laser-Electron-Gamma-Source [1] and most recently at Je#11;erson Lab during the running of the E06-101 (g14) experiment [2]. Preparations are underway to utilize the targets in future electron experiments after the completion of the 12 GeV JLab upgrade [3]. HD is an attractive target since all of the material is polarizable, of low Z, and requires only modest holding #12;elds. At the same time, the small contributions from the target cell can be subtracted from direct measurements. Reaching the frozen-spin state with both high polarization and a signi#12;cant spin relaxation time requires careful control of H2 and D2 impurities. Commercially available HD contains 0.5 - 2% concentrations of H2 and D2. Low-temperature distillation is required to reduce these concentrations to the 10􀀀4 level to enable useful target production. This distillation is done using a column #12;lled with heli-pack C [4] to give good separation e#14;ciency. Approximately 12 moles of commercial HD is condensed into the mechanically refrigerated system at the base temperature of 11K. The system is then isolated and the temperature stabilized at 18K producing liquid HD, which is boiled by a resistive heater. The circulation established by the boil-o#11; condensing throughout the column then #12;ltering back down produces a steady-state isotopic separation permitting the extraction of HD gas with very low H2 and D2 content. A residual gas analyzer initially monitors distillation. Once the H2 concentration falls below its useful operating range, samples are periodically collected for analysis using gas chromatography [5] and Raman scattering. Where the measurement techniques overlap, good agreement is obtained. The operation of the distillery and results of gas analysis will be discussed. References [1] Phy. Rev. Lett. 101 (2009) 172002. [2] www.jlab.org/exp_prog/proposals/06/PR-06-101.pdf [3] www.jlab.org/exp_prog/proposals/12/PR12-12-009.pdf, www.jlab.org/exp_prog/proposals/12/PR12-12-010.pdf, and www.jlab.org/exp_prog/proposals/11/PR12-11-111.pdf [4] Nucl. Inst. Meth. 664 (2012) 347, www.wilmad-labglass.com/Products/LG-6730-104/ [5] Rev. Sci. Instrum. 82, 024101 (2011).

Whisnant, Charles; D'Angelo, Annalisa; Colaneri, Luca; Devilbiss, J.; Kageya, Tsuneo; Loving, D.A.; Lowry, Michael; Rizzo, Alessandro; Sandorfi, Andrew; Schaerf, Carlo; Storey, J.D.; Wallace, C.M.; Wei, Xiangdong; Zonta, Irene

2014-06-01T23:59:59.000Z

63

Determination of the binding energies of the np Rydberg states of H{sub 2}, HD, and D{sub 2} from high-resolution spectroscopic data by multichannel quantum-defect theory  

SciTech Connect (OSTI)

Multichannel quantum-defect theory (MQDT) is used to calculate the electron binding energies of np Rydberg states of H{sub 2}, HD, and D{sub 2} around n = 60 at an accuracy of better than 0.5?MHz. The theory includes the effects of rovibronic channel interactions and the hyperfine structure, and has been extended to the calculation of the asymmetric hyperfine structure of Rydberg states of a heteronuclear diatomic molecule (HD). Starting values for the eigenquantum-defect parameters of MQDT were extracted from ab initio potential-energy functions for the low-lying p Rydberg states of molecular hydrogen and subsequently refined in a global weighted fit to available experimental data on the singlet and triplet Rydberg states of H{sub 2} and D{sub 2}. The electron binding energies of high-np Rydberg states derived in this work represent important quantities for future determinations of the adiabatic ionization energies of H{sub 2}, HD, and D{sub 2} at sub-MHz accuracy.

Sprecher, Daniel; Merkt, Frdric, E-mail: frederic.merkt@phys.chem.ethz.ch [Laboratorium fr Physikalische Chemie, ETH-Zrich, 8093 Zrich (Switzerland)] [Laboratorium fr Physikalische Chemie, ETH-Zrich, 8093 Zrich (Switzerland); Jungen, Christian [Laboratoire Aim Cotton du CNRS, Universit de Paris-Sud, 91405 Orsay (France)] [Laboratoire Aim Cotton du CNRS, Universit de Paris-Sud, 91405 Orsay (France)

2014-03-14T23:59:59.000Z

64

Measurements of spin observables in pseudo-scalar meson photo-production using polarized neutrons in solid HD  

SciTech Connect (OSTI)

A measurement of psuedo-scalar meson photo production from longitudinally polarized solid HD has been carried out with the CLAS at Thomas Jefferson National Accelerator Facility (Jlab) with circularly and linearly polarized photon beams. Its aim is to measure a complete set of spin observables for the neutron simultaneously from the same experiment. As a polarized neutron, deutron in HD was used. Preliminary asymmetries are shown for the {pi}{sup -} channel.

Kageya, Tsuneo [JLAB, Newport News, VA (United States)

2014-01-01T23:59:59.000Z

65

!"! #$%$#&'&()*+,-#-.*&/&012$034#$&56!!756!5& Sep 19 PVC 1 COG 1 PVC 2 PS1 --HD 1  

E-Print Network [OSTI]

-1 Wed 1-2 Thu 12-1 Fri 12-1 Jan 9 Stats Class Exam CHIP 1 CHIP 2 PHYS 1 - SOC 1 - Jan 16 ID 1 CHIP 3 Development Soc = Social ID = Individual Differences Stat = Statistics Mini = Mini 12-1 Fri 12-1 Sep 19 PVC 1 COG 1 PVC 2 PS1 - - HD 1 Sep 26 PVC 3 COG 2 PVC 4 HD 2 MINI 1 STAT 1

Williamson, John

66

HOST STAR PROPERTIES AND TRANSIT EXCLUSION FOR THE HD 38529 PLANETARY SYSTEM  

SciTech Connect (OSTI)

The transit signature of exoplanets provides an avenue through which characterization of exoplanetary properties may be undertaken, such as studies of mean density, structure, and atmospheric composition. The Transit Ephemeris Refinement and Monitoring Survey is a program to expand the catalog of transiting planets around bright host stars by refining the orbits of known planets discovered with the radial velocity technique. Here we present results for the HD 38529 system. We determine fundamental properties of the host star through direct interferometric measurements of the radius and through spectroscopic analysis. We provide new radial velocity measurements that are used to improve the Keplerian solution for the two known planets, and we find no evidence for a previously postulated third planet. We also present 12 years of precision robotic photometry of HD 38529 that demonstrate the inner planet does not transit and the host star exhibits cyclic variations in seasonal mean brightness with a timescale of approximately six years.

Henry, Gregory W. [Center of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Blvd., Box 9501, Nashville, TN 37209 (United States); Kane, Stephen R.; Von Braun, Kaspar; Ciardi, David R.; Hinkel, Natalie R. [NASA Exoplanet Science Institute, Caltech, MS 100-22, 770 South Wilson Avenue, Pasadena, CA 91125 (United States); Wang, Sharon X.; Wright, Jason T.; Mahadevan, Suvrath; Pilyavsky, Genady [Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802 (United States); Boyajian, Tabetha S.; Fischer, Debra A. [Department of Astronomy, Yale University, New Haven, CT 06511 (United States); Dragomir, Diana [Las Cumbres Observatory Global Telescope Network, 6740B Cortona Dr., Suite 102, Goleta, CA 93117 (United States); Farrington, Chris [The CHARA Array, Mount Wilson Observatory, Mount Wilson, CA 91023 (United States); Howard, Andrew W. [Institute for Astronomy, University of Hawaii, Honolulu, HI 96822 (United States); Jensen, Eric [Department of Physics and Astronomy, Swarthmore College, Swarthmore, PA 19081 (United States); Laughlin, Gregory, E-mail: gregory.w.henry@gmail.com [UCO/Lick Observatory, University of California, Santa Cruz, CA 95064 (United States)

2013-05-10T23:59:59.000Z

67

Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945  

E-Print Network [OSTI]

We present evolutionary models for cool brown dwarfs and extra-solar giant planets. The models reproduce the main trends of observed methane dwarfs in near-IR color-magnitude diagrams. We also present evolutionary models for irradiated planets, coupling for the first time irradiated atmosphere profiles and inner structures. We focus on HD 209458-like systems and show that irradiation effects can substantially affect the radius of sub-jovian mass giant planets. Irradiation effects, however, cannot alone explain the large observed radius of HD 209458b. Adopting assumptions which optimise irradiation effects and taking into account the extension of the outer atmospheric layers, we still find $\\sim$ 20% discrepancy between observed and theoretical radii. An extra source of energy seems to be required to explain the observed value of the first transit planet.

I. Baraffe; G. Chabrier; T. Barman; F. Allard; P. H. Hauschildt

2003-02-14T23:59:59.000Z

68

HD 51844: An Am delta Scuti in a binary showing periastron brightening  

E-Print Network [OSTI]

Pulsating stars in binary systems are ideal laboratories to test stellar evolution and pulsation theory, since a direct, model-independent determination of component masses is possible. The high-precision CoRoT photometry allows a detailed view of the frequency content of pulsating stars, enabling detection of patterns in their distribution. The object HD 51844 is such a case showing periastron brightening instead of eclipses. We present a comprehensive study of the HD 51844 system, where we derive physical parameters of both components, the pulsation content and frequency patterns. Additionally, we obtain the orbital elements, including masses, and the chemical composition of the stars. Time series analysis using standard tools was mployed to extract the pulsation frequencies. Photospheric abundances of 21 chemical elements were derived by means of spectrum synthesis. We derived orbital elements both by fitting the observed radial velocities and the light curves, and we did asteroseismic modelling as well. W...

Hareter, M; Weiss, W W; Hernndez, A Garca; Borkovits, T; Lampens, P; Rainer, M; De Cat, P; Marcos-Arenal, P; Vos, J; Poretti, E; Baglin, A; Michel, E; Baudin, F; Catala, C

2014-01-01T23:59:59.000Z

69

Investigating the pre-main sequence magnetic chemically peculiar system HD 72106  

E-Print Network [OSTI]

The origin of the strong magnetic fields observed in chemically peculiar Ap and Bp stars stars has long been debated. The recent discovery of magnetic fields in the intermediate mass pre-main sequence Herbig Ae and Be stars links them to Ap and Bp stars, providing vital clues about Ap and Bp stars and the origin and evolution of magnetic fields in intermediate and high mass stars. A detailed study of one young magnetic B star, HD 72106A, is presented. This star appears to be in a binary system with an apparently normal Herbig Ae star. A maximum longitudinal magnetic field strength of +391 +/- 65 G is found in HD 72106A, as are strong chemical peculiarities, with photospheric abundances of some elements ranging up to 100x above solar.

Folsom, C P; Hanes, D A; Catala, C; Alecian, E; Bagnulo, S; Bhm, T; Bouret, J C; Donati, J F; Landstreet, J D

2006-01-01T23:59:59.000Z

70

Study of HD 169392A observed by CoRoT and HARPS  

E-Print Network [OSTI]

The numerous results obtained with asteroseismology thanks to space missions such as CoRoT and Kepler are providing a new insight on stellar evolution. After five years of observations, CoRoT is going on providing high-quality data. We present here the analysis of the double star HD169392 complemented by ground-based spectroscopic observations. This work aims at characterizing the fundamental parameters of the two stars, their chemical composition, the acoustic-mode global parameters including their individual frequencies, and their dynamics. We have analysed HARPS observations of the two stars to retrieve their chemical compositions. Several methods have been used and compared to measure the global properties of acoustic modes and their individual frequencies from the photometric data of CoRoT. The new spectroscopic observations and archival astrometric values suggest that HD169392 is a wide binary system weakly bounded. We have obtained the spectroscopic parameters for both components, suggesting the origin...

Mathur, S; Catala, C; Benomar, O; Davies, G R; Garcia, R A; Salabert, D; Ballot, J; Mosser, B; Regulo, C; Chaplin, W J; Elsworth, Y; Handberg, R; Hekker, S; Mantegazza, L; Michel, E; Poretti, E; Rainer, M; Roxburgh, I W; Samadi, R; Steslicki, M; Uytterhoeven, K; Verner, G A; Auvergne, M; Baglin, A; Forteza, S Barcelo; Baudin, F; Cortes, T Roca

2012-01-01T23:59:59.000Z

71

Asteroseismic analysis of the CoRoT target HD 169392  

E-Print Network [OSTI]

The satellite CoRoT (Convection, Rotation, and planetary Transits) has provided high-quality data for almost six years. We show here the asteroseismic analysis and modeling of HD169392A, which belongs to a binary system weakly gravitationally bound as the distance between the two components is of 4250 AU. The main component, HD169392A, is a G0IV star with a magnitude of 7.50 while the second component is a G0V-G2IV star with a magnitude of 8.98. This analysis focuses on the main component, as the secondary one is too faint to measure any seismic parameters. A complete modeling has been possible thanks to the complementary spectroscopic observations from HARPS, providing Teff=5985+/-60K, log g=3.96+/-0.07, and [Fe/H]=- 0.04+/-0.10.

Mathur, S; Catala, C; Benomar, O; Davies, G R; Garcia, R A; Salabert, D; Ballot, J; Mosser, B; Regulo, C; Chaplin, W J; Elsworth, Y; Handberg, R; Hekker, S; Mantegazza, L; Michel, E; Poretti, E; Rainer, M; Roxburgh, I W; Samadi, R; Steslicki, M; Uytterhoeven, K; Verner, G A; Auvergne, M; Baglin, A; Forteza, S Barcelo; Baudin, F; Cortes, T Roca

2013-01-01T23:59:59.000Z

72

A Comprehensive Analysis of the Magnetic Standard Star HD 94660: Host of a Massive Compact Companion?  

E-Print Network [OSTI]

Detailed information about the magnetic geometry, atmospheric abundances and radial velocity variations has been obtained for the magnetic standard star HD 94660 based on high-dispersion spectroscopic and spectropolarimetric observations from the UVES, HARPSpol and ESPaDOnS instruments. We perform a detailed chemical abundance analysis using the spectrum synthesis code zeeman for a total of 17 elements. Using both line-of-sight and surface magnetic field measurements, we derive a simple magnetic field model that consists of dipole, quadrupole and octupole components. The observed magnetic field variations of HD 94660 are complex and suggest an inhomogeneous distribution of chemical elements over the stellar surface. This inhomogeneity is not reflected in the abundance analysis, from which all available spectra are modelled, but only a mean abundance is reported for each element. The derived abundances are mostly non-solar, with striking overabundances of Fe-peak and rare-earth elements. Of note are the clear ...

Bailey, J D; Landstreet, J D

2015-01-01T23:59:59.000Z

73

Nuclear interference in dissociating of HD{sup +} in ultrashort laser fields  

SciTech Connect (OSTI)

The dissociation dynamics of HD{sup +} molecules is studied theoretically by numerically solving the time-dependent Schroedinger equation in which the molecular vibrational and rotational degrees of freedom are included. Based on the Born-Oppenheimer approximation, the ground 1s{sigma}{sub g} state and the excited 2p{sigma}{sub u} state are taken into account, corresponding to two dissociative channels HD{sup +}{yields}D + H{sup +} and HD{sup +}{yields}H + D{sup +}, respectively. Two dissociative nuclear wave packets overlap and interfere after excited by two ultrashort laser pulses. The interference patterns can be controlled by varying the laser parameters and the dissociation probabilities are demonstrated for different laser fields. The kinetic energy-dependent distributions of the fragments are calculated using an asymptotic-flow expression in the momentum space. The branching ratio D{sup +}/(H{sup +} + D{sup +}), as a function of the delay time and the relative phase between two laser pulses, is also discussed.

Yang Di [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China); State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China); Cong Shulin [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)

2011-07-15T23:59:59.000Z

74

The Abundance Distribution in the Extrasolar-Planet Host Star HD19994  

E-Print Network [OSTI]

Abundances of 22 elements have been determined from a high-resolution, high signal-to-noise spectrum of HD19994, a star recently announced as harboring an extrasolar planet. A detailed spectroscopic analysis of this stars finds it to have a mass of 1.2+/-0.1Msun. HD19994 is found to be slightly enriched in "metals" relative to the Sun 9[Fe/H]=+0.09+/-0.05 and an average of all metals of [m/H]=+0.13), as are most stars known with extrasolar planets. In a search for possible signatures of accretion of metal-rich gas onto the parent stars (using HD19994 and published abundances for other stars), it is found that a small subset of stars with planets exhibit a trend of increasing [X/H] with increasing condensation temperature for a given element X. This trend may point to the accretion of chemically fractionated solid material into the outer (thin) convection zones of these solar-type stars. It is also found that this small group of stars exhibiting an accretion signature all have large planets orbiting much closer than is found, in general, for stars with planets not showing this peculiar abundance trend, suggesting a physical link between accretion and orbital separation. In addition, the stars showing evidence of fractionated accretion are, on average, of larger mass (1.2Msun) than stars not showing measurable evidence of accretion (1.0Msun).

Verne V. Smith; Katia Cunha; Daniela Lazzaro

2001-03-04T23:59:59.000Z

75

Photometric study of HD 155555 C in the $\\beta$ Pictoris Association  

E-Print Network [OSTI]

We are carrying out a series of photometric monitoring to measure the rotation periods of members in the young $\\beta$ Pictoris Association, as part of the RACE-OC project (Rotation and ACtivity Evolution in Open Clusters). In this paper, we present the results for HD 155555C which is believed to be physically associated to the spectroscopic binary V824 Ara (HD155555) and thus constituting a triple system. We collected B, V, and R-band photometric data timeseries and discovered from periodogram analysis the rotation period P = 4.43d. Combined with stellar radius and projected rotational velocity, we find this star almost equator-on with an inclination $i$ $\\simeq$ 90$^{\\circ}$. The rotational properties of HD155555C fit well into the period distribution of other $\\beta$ Pic members, giving further support to the suggested membership to the association and to its physical association to V824 Ara. A comparison with Pre-Main-Sequence isochrones from various models allows us to estimate an age of 20$\\pm$15 Myr fo...

Messina, Sergio; Bradstreet, David H

2015-01-01T23:59:59.000Z

76

Seismic analysis of HD43587Aa, a solar-like oscillator in a multiple system  

E-Print Network [OSTI]

Context. The object HD 43587Aa is a G0V star observed during the 145-day LRa03 run of the COnvection, ROtation and planetary Transits space mission (CoRoT), for which complementary High Accuracy Radial velocity Planet Searcher (HARPS) spectra with S/N>300 were also obtained. Its visual magnitude is 5.71, and its effective temperature is close to 5950 K. It has a known companion in a highly eccentric orbit and is also coupled with two more distant companions. Aims. We undertake a preliminary investigation of the internal structure of HD 43587Aa. Methods. We carried out a seismic analysis of the star, using maximum likelihood estimators and Markov Chain Monte Carlo methods. Results. We established the first table of the eigenmode frequencies, widths, and heights for HD 43587Aa. The star appears to have a mass and a radius slightly larger than the Sun, and is slightly older (5.6 Gyr). Two scenarios are suggested for the geometry of the star: either its inclination angle is very low, or the rotation velocity of t...

Boumier, P; Baudin, F; Verner, G; Appourchaux, T; Lebreton, Y; Gaulme, P; Chaplin, W; Garcia, R A; Hekker, S; Regulo, C; Salabert, D; Stahn, T; Elsworth, Y; Gizon, L; Hall, M; Mathur, S; Michel, E; Morel, T; Mosser, B; Poretti, E; Rainer, M; Roxburgh, I; Nascimento, J -D do; Samadi, R; Auvergne, M; Chaintreuil, S; Baglin, A; Catala, C

2014-01-01T23:59:59.000Z

77

HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet  

E-Print Network [OSTI]

HD 46375 is known to host a Saturn-like exoplanet orbiting at 0.04 AU from its host star. Stellar light reflected by the planet was tentatively identified in the 34-day CoRoT run acquired in October-November 2008. We constrain the properties of the magnetic field of HD 46375 based on spectropolarimetric observations with the NARVAL spectrograph at the Pic du Midi observatory. In addition, we use a high-resolution NARVAL flux spectrum to contrain the atmospheric parameters. With these constraints, we perform an asteroseismic analysis and modelling of HD 46375 using the frequencies extracted from the CoRoT light curve. We used Zeeman Doppler imaging to reconstruct the magnetic map of the stellar surface. In the spectroscopic analysis we fitted isolated lines using 1D LTE atmosphere models. This analysis was used to constrain the effective temperature, surface gravity, and chemical composition of the star. To extract information about the p-mode oscillations, we used a technique based on the envelope autocorrela...

Gaulme, P; Weiss, W W; Mosser, B; Moutou, C; Bruntt, H; Donati, J -F; Vannier, M; Guillot, T; Appourchaux, T; Michel, E; Auvergne, M; Samadi, R; Baudin, F; Catala, C; Baglin, A; 10.1051/0004-6361/201014142

2010-01-01T23:59:59.000Z

78

On the spectroscopic nature of the cool evolved Am star HD151878  

E-Print Network [OSTI]

Recently, Tiwari, Chaubey, & Pandey (2007) detected the bright component of the visual binary HD151878 to exhibit rapid photometric oscillations through a Johnson B filter with a period of 6 min (2.78 mHz) and a high, modulated amplitude up to 22 mmag peak-to-peak, making this star by far the highest amplitude roAp star known. As a new roAp star, HD151878 is of additional particular interest as a scarce example of the class in the northern sky, and only the second known case of an evolved roAp star - the other being HD 116114. We used the FIES spectrograph at the Nordic Optical Telescope to obtain high time resolution spectra at high dispersion to attempt to verify the rapid oscillations. We show here that the star at this epoch is spectroscopically stable to rapid oscillations of no more than a few tens of m/s. The high-resolution spectra furthermore show the star to be of type Am rather than Ap and we show the star lacks most of the known characteristics for rapidly oscillating Ap stars. We conclude that this is an Am star that does not pulsate with a 6-min period. The original discovery of pulsation is likely to be an instrumental artefact.

L. M. Freyhammer; V. G. Elkin; D. W. Kurtz

2008-07-17T23:59:59.000Z

79

Energetic neutral atoms as the explanation for the high velocity hydrogen around HD 209458b  

E-Print Network [OSTI]

Absorption in the stellar Lyman-$\\alpha$ (Ly-$\\alpha$) line observed during the transit of the extrasolar planet HD 209458b reveals high velocity atomic hydrogen at great distances from the planet. This has been interpreted as hydrogen atoms escaping from the exosphere of the planet, possibly undergoing hydrodynamic blow-off, being accelerated by stellar radiation pressure. However, around solar system planets the production of energetic neutral atoms from charge exchange between solar wind protons and neutral hydrogen from the exospheres has been observed, and should also occur at extrasolar planets. Here we show that the measured transit-associated Ly-$\\alpha$ absorption can be explained by the interaction between the exosphere of HD 209458b and the stellar wind, and that radiation pressure alone cannot explain the observation. This is the first observation of energetic neutral atoms outside the solar system. Since the stellar wind protons are the source of the observed energetic neutral atoms, this provides a completely new method of probing stellar wind conditions, and our model suggests a slow and hot stellar wind near HD 209458b at the time of the observation.

M. Holmstrm; A. Ekenbck; F. Selsis; T. Penz; H. Lammer; P. Wurz

2008-02-20T23:59:59.000Z

80

Multiperiodicity in the large-amplitude rapidly-rotating $?$Ceph ei star HD 203664  

E-Print Network [OSTI]

We perform a seismic study of the young massive $\\beta $Cephei star HD 203664 with the goal to constrain its interior structure. Our study is based on a time series of 328 new Geneva 7-colour photometric data of the star spread over 496.8 days. The data confirm the frequency of the dominant mode of the star which we refine to $f_1=6.02885 $c d$^{-1}$. The mode has a large amplitude of 37 mmag in V and is unambiguously identified as a dipole mode ($\\ell=2$) from its amplitude ratios and non-adiabatic computations. Besides $f_1$, we discover two additional new frequencies in the star with amplitudes above $4\\sigma$: $f_2=6.82902 $c d$^{-1}$ and $f_3=4.81543 $c d$^{-1}$ or one of their daily aliases. The amplitudes of these two modes are only between 3 and 4 mmag which explains why they were not detected before. Their amplitude ratios are too uncertain for mode identification. We show that the observed oscillation spectrum of HD 203664 is compatible with standard stellar models but that we have insufficient information for asteroseismic inferences. Among the large-amplitude $\\beta $Cephei stars, HD 203664 stands out as the only one rotating at a significant fraction of its critical rotation velocity ($\\sim 40%$).

C. Aerts; P. De Cat; J. De Ridder; H. Van Winckel; G. Raskin; G. Davignon; K. Uytterhoeven

2005-11-10T23:59:59.000Z

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81

Grant Title: INTELLECTUAL AND DEVELOPMENTAL DISABILITIES RESEARCH CENTERS (P30) Funding Opportunity Number: RFA-HD-13-002. CFDA Number(s): 93.865.  

E-Print Network [OSTI]

Number: RFA-HD-13-002. CFDA Number(s): 93.865. Agency/Department: Department of Health and Human Services

Farritor, Shane

82

A RESOLVED DEBRIS DISK AROUND THE CANDIDATE PLANET-HOSTING STAR HD 95086  

SciTech Connect (OSTI)

Recently, a new planet candidate was discovered on direct images around the young (10-17 Myr) A-type star HD 95086. The strong infrared excess of the system indicates that, similar to HR8799, ? Pic, and Fomalhaut, the star harbors a circumstellar disk. Aiming to study the structure and gas content of the HD 95086 disk, and to investigate its possible interaction with the newly discovered planet, here we present new optical, infrared, and millimeter observations. We detected no CO emission, excluding the possibility of an evolved gaseous primordial disk. Simple blackbody modeling of the spectral energy distribution suggests the presence of two spatially separate dust belts at radial distances of 6 and 64 AU. Our resolved images obtained with the Herschel Space Observatory reveal a characteristic disk size of ?6.''0 5.''4 (540 490 AU) and disk inclination of ?25. Assuming the same inclination for the planet candidate's orbit, its reprojected radial distance from the star is 62 AU, very close to the blackbody radius of the outer cold dust ring. The structure of the planetary system at HD 95086 resembles the one around HR8799. Both systems harbor a warm inner dust belt and a broad colder outer disk and giant planet(s) between the two dusty regions. Modeling implies that the candidate planet can dynamically excite the motion of planetesimals even out to 270 AU via their secular perturbation if its orbital eccentricity is larger than about 0.4. Our analysis adds a new example to the three known systems where directly imaged planet(s) and debris disks coexist.

Mor, A.; brahm, P.; Szab, Gy. M.; Kiss, Cs. [Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest (Hungary)] [Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest (Hungary); Kspl, . [European Space Agency (ESA/ESTEC, SRE-SA), P.O. Box 299, 2200 AG, Noordwijk (Netherlands)] [European Space Agency (ESA/ESTEC, SRE-SA), P.O. Box 299, 2200 AG, Noordwijk (Netherlands); Apai, D.; Pascucci, I. [Department of Astronomy and Department of Planetary Sciences, The University of Arizona, Tucson, AZ 85721 (United States)] [Department of Astronomy and Department of Planetary Sciences, The University of Arizona, Tucson, AZ 85721 (United States); Balog, Z.; Henning, Th. [Max-Planck-Institut fr Astronomie, Knigstuhl 17, D-69117 Heidelberg (Germany)] [Max-Planck-Institut fr Astronomie, Knigstuhl 17, D-69117 Heidelberg (Germany); Csengeri, T. [Max-Planck-Institut fr Radioastronomie, Auf dem Hgel 69, D-53121 Bonn (Germany)] [Max-Planck-Institut fr Radioastronomie, Auf dem Hgel 69, D-53121 Bonn (Germany); Grady, C. [NASA Goddard Space Flight Center, Code 667, Greenbelt, MD 20771 (United States)] [NASA Goddard Space Flight Center, Code 667, Greenbelt, MD 20771 (United States); Juhsz, A. [Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden (Netherlands)] [Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden (Netherlands); Szulgyi, J. [Universit de Nice Sophia-Antipolis, Observatoire de la Cte d'Azur, CNRS UMR 7293, F-06108 Nice Cedex 2 (France)] [Universit de Nice Sophia-Antipolis, Observatoire de la Cte d'Azur, CNRS UMR 7293, F-06108 Nice Cedex 2 (France); Vavrek, R., E-mail: moor@konkoly.hu [Herschel Science Centre, ESA/ESAC, P.O. Box 78, Villanueva de la Caada, E-28691 Madrid (Spain)

2013-10-01T23:59:59.000Z

83

The CoRoT primary target HD 52265: models and seismic tests  

E-Print Network [OSTI]

HD 52265 is the only known exoplanet-host star selected as a main target for the seismology programme of the CoRoT satellite. As such, it will be observed continuously during five months, which is of particular interest in the framework of planetary systems studies. This star was misclassified as a giant in the Bright Star Catalog, while it is more probably on the main-sequence or at the beginning of the subgiant branch. We performed an extensive analysis of this star, showing how asteroseismology may lead to a precise determination of its external parameters and internal structure. We first reviewed the observational constraints on the metallicity, the gravity and the effective temperature derived from the spectroscopic observations of HD 52265. We also derived its luminosity using the Hipparcos parallax. We computed the evolutionary tracks for models of various metallicities which cross the relevant observational error boxes in the gravity-effective temperature plane. We selected eight different stellar models which satisfy the observational constraints, computed their p-modes frequencies and analysed specific seismic tests. The possible models for HD 52265, which satisfy the constraints derived from the spectroscopic observations, are different in both their external and internal parameters. They lie either on the main sequence or at the beginning of the subgiant branch. The differences in the models lead to quite different properties of their oscillation frequencies. We give evidences of an interesting specific behaviour of these frequencies in case of helium-rich cores: the ``small separations'' may become negative and give constraints on the size of the core. We expect that the observations of this star by the CoRoT satellite wi ll allow choosing between these possible models.

M. Soriano; S. Vauclair; C. Vauclair; M. Laymand

2007-05-17T23:59:59.000Z

84

New observations of the extended hydrogen exosphere of the extrasolar planet HD209458b  

E-Print Network [OSTI]

Atomic hydrogen escaping from the planet HD209458b provides the largest observational signature ever detected for an extrasolar planet atmosphere. However, the Space Telescope Imaging Spectrograph (STIS) used in previous observational studies is no longer available, whereas additional observations are still needed to better constrain the mechanisms subtending the evaporation process, and determine the evaporation state of other `hot Jupiters'. Here, we aim to detect the extended hydrogen exosphere of HD209458b with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST) and to find evidence for a hydrogen comet-like tail trailing the planet, which size would depend on the escape rate and the amount of ionizing radiation emitted by the star. These observations also provide a benchmark for other transiting planets, in the frame of a comparative study of the evaporation state of close-in giant planets. Eight HST orbits are used to observe two transits of HD209458b. Transit light curves are obtained by performing photometry of the unresolved stellar Lyman-alpha emission line during both transits. Absorption signatures of exospheric hydrogen during the transit are compared to light curve models predicting a hydrogen tail. Transit depths of (9.6 +/- 7.0)% and (5.3 +/- 10.0)% are measured on the whole Lyman-alpha line in visits 1 and 2, respectively. Averaging data from both visits, we find an absorption depth of (8.0 +/- 5.7)%, in good agreement with previous studies. The extended size of the exosphere confirms that the planet is likely loosing hydrogen to space. Yet, the photometric precision achieved does not allow us to better constrain the hydrogen mass loss rate.

David Ehrenreich; Alain Lecavelier des Etangs; Guillaume Hbrard; Jean-Michel Dsert; Alfred Vidal-Madjar; John C. McConnell; Christopher D. Parkinson; Gilda E. Ballester

2008-03-12T23:59:59.000Z

85

Non-LTE metal abundances in V652 Her and HD144941  

E-Print Network [OSTI]

Two evolutionary scenarios are proposed for the formation of extreme helium stars: a post-AGB star suffering from a late thermal pulse, or the merger of two white dwarfs. An identification of the evolutionary channel for individual objects has to rely on surface abundances. We present preliminary results from a non-LTE analysis of CNO, Mg and S for two unique objects, V652 Her and HD144941. Non-LTE abundance corrections for these elements range from negligible values to ~0.7 dex. Non-LTE effects typically lead to systematic shifts in the abundances relative to LTE and reduce the uncertainties.

N. Przybilla; M. F. Nieva; U. Heber; C. S. Jeffery

2005-12-06T23:59:59.000Z

86

"!#$%'&()$021436587 9A@BC5D9EBGFH@7I@P$Q1SRTUV WYX`$a'14RTbcRTde1SfGgihqprs%412tvuuw xyy Hd$yefygyTxheiHd$yecjqkl#mn$xhopyqn  

E-Print Network [OSTI]

Ggihqprs%412tvuuw xyy Hd$yefygyTxheiHd$yecjqkl#mn$xhopyqn ersqrtTuTvw)w)xTy{z|tuf}r~rSxTw)xTyv yvC'nvYD8Sv chromospheric conditions is plotted in Fig. 1. "!Tvw : # E$%$YC'CcA}{8|'YSi ( & 2 ' ( For instance, in regions of sufficiently strong vertical mag- netic field, a series of shocks may lift

Kosovichev, Alexander G.

87

A resolved debris disk around the candidate planet-hosting star HD95086  

E-Print Network [OSTI]

Recently, a new planet candidate was discovered on direct images around the young (10-17 Myr) A-type star HD95086. The strong infrared excess of the system indicates that, similarly to HR8799, {\\ss} Pic, and Fomalhaut, the star harbors a circumstellar disk. Aiming to study the structure and gas content of the HD95086 disk, and to investigate its possible interaction with the newly discovered planet, here we present new optical, infrared and millimeter observations. We detected no CO emission, excluding the possibility of an evolved gaseous primordial disk. Simple blackbody modeling of the spectral energy distribution suggests the presence of two spatially separate dust belts at radial distances of 6 and 64 AU. Our resolved images obtained with the Herschel Space Observatory reveal a characteristic disk size of ~6.0x5.4 arcsec (540x490 AU) and disk inclination of ~25 degree. Assuming the same inclination for the planet candidate's orbit, its re-projected radial distance from the star is 62 AU, very close to th...

Mor, A; Kspl, ; Szab, Gy M; Apai, D; Balog, Z; Csengeri, T; Grady, C; Henning, Th; Juhsz, A; Kiss, Cs; Pascucci, I; Szulgyi, J; Vavrek, R

2013-01-01T23:59:59.000Z

88

The Massive Progenitor of the Possible Type II-Linear Supernova 2009hd in Messier 66  

E-Print Network [OSTI]

We present observations of SN2009hd in the nearby galaxy M66. This SN is one of the closest to us in recent years but heavily obscured by dust, rendering it unusually faint in the optical, given its proximity. We find that the observed properties of SN2009hd support its classification as a possible Type II-L SN, a relatively rare subclass of CC-SNe. High-precision relative astrometry has been employed to attempt to identify a SN progenitor candidate, based on a pixel-by-pixel comparison between HST F555W and F814W images of the SN site prior to explosion and at late times. A progenitor candidate is identified in the F814W images only; this object is undetected in F555W. Significant uncertainty exists in the astrometry, such that we cannot definitively identify this object as the SN progenitor. Via insertion of artificial stars into the pre-SN HST images, we are able to constrain the progenitor's properties to those of a possible supergiant, with M(F555W)0>-7.6 mag and (V-I) 0>0.99 mag. The magnitude and color...

Elias-Rosa, Nancy; Li, Weidong; Silverman, Jeffrey M; Foley, Ryan J; Ganeshalingam, Mohan; Mauerhan, Jon C; Kankare, Erkki; Jha, Saurabh; Filippenko, Alexei V; Beckman, John E; Berger, Edo; Cuillandre, Jean-Charles; Smith, Nathan

2011-01-01T23:59:59.000Z

89

The solar-like CoRoT target HD 170987: spectroscopic and seismic observations  

E-Print Network [OSTI]

The CoRoT mission is in its third year of observation and the data from the second long run in the galactic centre direction are being analysed. The solar-like oscillating stars that have been observed up to now have given some interesting results, specially concerning the amplitudes that are lower than predicted. We present here the results from the analysis of the star HD 170987.The goal of this research work is to characterise the global parameters of HD 170987. We look for global seismic parameters such as the mean large separation, maximum amplitude of the modes, and surface rotation because the signal-to-noise ratio in the observations do not allow us to measure individual modes. We also want to retrieve the stellar parameters of the star and its chemical composition.We have studied the chemical composition of the star using ground-based observations performed with the NARVAL spectrograph. We have used several methods to calculate the global parameters from the acoustic oscillations based on CoRoT data....

Mathur, S; Catala, C; Bruntt, H; Mosser, B; Appourchaux, T; Ballot, J; Creevey, O L; Gaulme, P; Hekker, S; Huber, D; Karoff, C; Piau, L; Regulo, C; Roxburgh, I W; Salabert, D; Verner, G A; Auvergne, M; Baglin, A; Chaplin, W J; Elsworth, Y; Michel, E; Samadi, R; Sato, K; Stello, D

2010-01-01T23:59:59.000Z

90

Characterisation of the magnetic field of the Herbig Be star HD 200775  

E-Print Network [OSTI]

After our recent discovery of four magnetic Herbig stars, we have decided to study in detail one of them, HD 200775, to determine if its magnetic topology is similar to that of the main sequence magnetic stars. With this aim, we monitored this star in Stokes I and V over more than two years, using the new spectropolarimeters ESPaDOnS at CFHT, and Narval at TBL. Using our data, we find that HD 200775 is a double-lined spectroscopic binary system, whose secondary seems similar, in temperature, to the primary. We determine the luminosity ratio of the system, and using the luminosity of the system found in literature, we derive the luminosity of both stars. From our measurements of the radial velocities of both stars we determine the ephemeris and the orbital parameters of the system. We have fitted 30 Stokes V profiles simultaneously, using a chi2 minimisation method, with a decentered-dipole model. The best-fit model provides a rotation period of 4.3281 d an inclination angle of 60 degrees, and a magnetic obliq...

Alecian, E; Wade, G A; Donati, J -F; Petit, P; Landstreet, J D; Bagnulo, S; Bhm, T; Bouret, J -C; Folsom, C; Grunhut, J; Silvester, J

2007-01-01T23:59:59.000Z

91

Searching for Star-Planet interactions within the magnetosphere of HD 189733  

E-Print Network [OSTI]

HD 189733 is a K2 dwarf, orbited by a giant planet at 8.8 stellar radii. In order to study magnetospheric interactions between the star and the planet, we explore the large-scale magnetic field and activity of the host star. We collected spectra using the ESPaDOnS and the NARVAL spectropolarimeters, installed at the 3.6-m Canada-France-Hawaii telescope and the 2-m Telescope Bernard Lyot at Pic du Midi, during two monitoring campaigns (June 2007 and July 2008). HD 189733 has a mainly toroidal surface magnetic field, having a strength that reaches up to 40 G. The star is differentially rotating, with latitudinal angular velocity shear of domega = 0.146 +- 0.049 rad/d, corresponding to equatorial and polar periods of 11.94 +- 0.16 d and 16.53 +- 2.43 d respectively. The study of the stellar activity shows that it is modulated mainly by the stellar rotation (rather than by the orbital period or the beat period between the stellar rotation and the orbital periods). We report no clear evidence of magnetospheric int...

Fares, R; Moutou, C; Jardine, M M; Griessmeier, J -M; Zarka, P; Shkolnik, E L; Bohlender, D; Catala, C; Cameron, A C

2010-01-01T23:59:59.000Z

92

Pulsations in the late-type Be star HD 50209 detected by CoRoT  

E-Print Network [OSTI]

The presence of pulsations in late-type Be stars is still a matter of controversy. It constitutes an important issue to establish the relationship between non-radial pulsations and the mass-loss mechanism in Be stars. To contribute to this discussion, we analyse the photometric time series of the B8IVe star HD 50209 observed by the CoRoT mission in the seismology field. We use standard Fourier techniques and linear and non-linear least squares fitting methods to analyse the CoRoT light curve. In addition, we applied detailed modelling of high-resolution spectra to obtain the fundamental physical parameters of the star. We have found four frequencies which correspond to gravity modes with azimuthal order m=0,-1,-2,-3 with the same pulsational frequency in the co-rotating frame. We also found a rotational period with a frequency of 0.679 \\cd (7.754 $\\mu$Hz). HD 50209 is a pulsating Be star as expected from its position in the HR diagram, close to the SPB instability strip.

Diago, P D; Auvergne, M; Fabregat, J; Hubert, A -M; Floquet, M; Frmat, Y; Garrido, R; Andrade, L; De Batz, B; Emilio, M; Espinosa-Lara, F; Huat, A -L; Janot-Pacheco, E; Leroy, B; Martayan, C; Neiner, C; Semaan, T; Suso, J; Catala, C; Poretti, E; Rainer, M; Uytterhoeven, K; Michel, E; Samadi, R

2009-01-01T23:59:59.000Z

93

Long-term spectroscopic monitoring of the Luminous Blue Variable HD160529  

E-Print Network [OSTI]

We have spectroscopically monitored the galactic Luminous Blue Variable HD 160529 and obtained an extensive high-resolution data set that covers the years 1991 to 2002. During this period, the star evolved from an extended photometric minimum phase towards a new visual maximum. In several observing seasons, we covered up to four months with almost daily spectra. Our spectra typically cover most of the visual spectral range with a high spectral resolution (about 20,000 or more). This allows us to investigate the variability in many lines and on many time scales from days to years. We find a correlation between the photospheric HeI lines and the brightness of the star, both on a time scale of months and on a time scale of years. The short-term variations are smaller and do not follow the long-term trend, strongly suggesting different physical mechanisms. Metal lines also show both short-term and long-term variations in strength and also a long-term trend in radial velocity. Most of the line-profile variations can be attributed to changing strengths of lines. Propagating features in the line profiles are rarely observed. We find that the mass-loss rate of HD 160529 is almost independent of temperature, i.e. visual brightness.

Otmar Stahl; Thomas Gaeng; Chris Sterken; Andreas Kaufer; Thomas Rivinius; Thomas Szeifert; Bernhard Wolf

2002-12-20T23:59:59.000Z

94

A search for rapid pulsations in the magnetic cool chemically peculiar star HD3980  

E-Print Network [OSTI]

The Ap star HD3980 appears to be a promising roAp candidate based on its fundamental parameters, leading us to search for rapid pulsations with the VLT UV-Visual Echelle Spectrograph (UVES). A precise Hipparcos parallax and estimated temperature of 8100K place HD3980 in the middle of the theoretical instability strip for rapidly oscillating Ap stars, about halfway through its main sequence evolution stage. The star has a strong, variable magnetic field, as is typical of the cool magnetic Ap stars. Dipole model parameters were determined from VLT observations using FORS1. From Doppler shift measurements for individual spectral lines of rare earth elements and the H-alpha line core, we find no pulsations above 20-30 m/s. This result is corroborated by inspection of lines of several other chemical elements, as well as with crosscorrelation for long spectral regions with the average spectrum as a template. Abundances of chemical elements were determined and show larger than solar abundances of rare earth elements. Further, ionisation disequilibria for the first two ionised states of Nd and Pr are detected. We also find that the star has a strong overabundance of manganese, which is typical for much hotter HgMn and other Bp stars. Line profile variability with the rotation period was detected for the majority of chemical species.

V. G. Elkin; D. W. Kurtz; L. M. Freyhammer; S. Hubrig; G. Mathys

2008-08-20T23:59:59.000Z

95

Discovery and application of Frequency Ratio Method to the new multiperiodic gamma Dor star HD 218427  

E-Print Network [OSTI]

gamma Dor-type oscillations have been discovered in the star HD218427 through simultaneous uvby photometric observations carried out in the year 2003. A few Hbeta-Crawford measurements were also collected for calibration purposes which place this star well-located inside the gamma Dor instability region. Deficiency in metal content, similar to other well-defined gamma Dor stars, is found in HD218427 and the possibility of a lambda Boo nature is discussed. Frequency analysis was carried out for different filters, the combined "vby" filter was also used and five frequencies were found as significant with periods ranging between 0.3 and 0.8 days. The recently developed Frequency Ratio Method is used in order to perform an identification of the excited modes. The results are consistent with an l=2 identification for all the modes and high radial quantum numbers (n~40) for the three main observed periodicities. The possibility of multiplet structures is also discussed. However, no consistency is found when the Tim...

Rodrguez, E; Surez, J C; Moya, A; Dupret, M A; Poretti, E; Grigahcene, A; Costa, V; Lopez-Gonzalez, M J

2006-01-01T23:59:59.000Z

96

HD172189: another step in furnishing one of the best laboratories known for asteroseismic studies  

E-Print Network [OSTI]

HD172189 is a spectroscopic eclipsing binary system with a rapidly-rotating pulsating delta Scuti component. It is also a member of the open cluster IC4756. These combined characteristics make it an excellent laboratory for asteroseismic studies. To date, HD172189 has been analysed in detail photometrically but not spectroscopically. For this reason we have compiled a set of spectroscopic data to determine the absolute and atmospheric parameters of the components. We determined the radial velocities (RV) of both components using four different techniques. We disentangled the binary spectra using KOREL, and performed the first abundance analysis on both disentangled spectra. By combining the spectroscopic results and the photometric data, we obtained the component masses, 1.8 and 1.7 solar masses, and radii, 4.0 and 2.4 solar radii, for inclination i = 73.2 degrees, eccentricity e = 0.28, and orbital period 5.70198 days. Effective temperatures of 7600 K and 8100 K were also determined. The measured vsini are 7...

Creevey, O L; Martn-Ruiz, S; Amado, P J; Niemczura, E; VanWinckel, H; Surez, J C; Rolland, A; Rodler, F; Rodrguez-Lpez, C; Rodrguez, E; Raskin, G; Rainer, M; Poretti, E; Pall, P; Molina, R; Moya, A; Mathias, P; Guillou, L Le; Hadrava, P; Fabbian, D; Garrido, R; Decin, L; Cutispoto, G; Casanova, V; Broeders, E; Ferro, A Arellano; Aceituno, F

2009-01-01T23:59:59.000Z

97

Near-Infrared Detection and Characterization of the Exoplanet HD 95086 b with the Gemini Planet Imager  

E-Print Network [OSTI]

HD 95086 is an intermediate-mass debris-disk-bearing star. VLT/NaCo $3.8 \\mu m$ observations revealed it hosts a $5\\pm2 \\mathrm{M}_{Jup}$ companion (HD 95086 b) at $\\simeq 56$ AU. Follow-up observations at 1.66 and 2.18 $\\mu m$ yielded a null detection, suggesting extremely red colors for the planet and the need for deeper direct-imaging data. In this Letter, we report H- ($1.7 \\mu m$) and $\\mathrm{K}_1$- ($2.05 \\mu m$) band detections of HD 95086 b from Gemini Planet Imager (GPI) commissioning observations taken by the GPI team. The planet position in both spectral channels is consistent with the NaCo measurements and we confirm it to be comoving. Our photometry yields colors of H-L'= $3.6\\pm 1.0$ mag and K$_1$-L'=$2.4\\pm 0.7$ mag, consistent with previously reported 5-$\\sigma$ upper limits in H and Ks. The photometry of HD 95086 b best matches that of 2M 1207 b and HR 8799 cde. Comparing its spectral energy distribution with the BT-SETTL and LESIA planet atmospheric models yields T$_{\\mathrm{eff}}\\sim$600-1...

Galicher, Raphael; Bonnefoy, Mickael; Baudino, Jean-Loup; Currie, Thayne; Boccaletti, Anthony; Chauvin, Gael; Lagrange, Anne-Marie; Marois, Christian

2014-01-01T23:59:59.000Z

98

Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265  

E-Print Network [OSTI]

The star HD 52265 is a G0V metal-rich exoplanet-host star observed in the seismology field of the CoRoT space telescope from November 2008 to March 2009. The satellite collected 117 days of high-precision photometric data on this star, showing that it presents solar-like oscillations. HD 52265 was also observed in spectroscopy with the Narval spectrograph at the same epoch. We characterise HD 52265 using both spectroscopic and seismic data. The fundamental stellar parameters of HD 52265 were derived with the semi-automatic software VWA, and the projected rotational velocity was estimated by fitting synthetic profiles to isolated lines in the observed spectrum. The parameters of the observed p modes were determined with a maximum-likelihood estimation. We performed a global fit of the oscillation spectrum, over about ten radial orders, for degrees l=0 to 2. We also derived the properties of the granulation, and analysed a signature of the rotation induced by the photospheric magnetic activity. Precise determin...

Ballot, J; Samadi, R; Vauclair, G; Benomar, O; Bruntt, H; Mosser, B; Stahn, T; Verner, G A; Campante, T L; Garca, R A; Mathur, S; Salabert, D; Gaulme, P; Rgulo, C; Roxburgh, I W; Appourchaux, T; Baudin, F; Catala, C; Chaplin, W J; Deheuvels, S; Michel, E; Bazot, M; Creevey, O; Dolez, N; Elsworth, Y; Sato, K H; Vauclair, S; Auvergne, M; Baglin, A; 10.1051/0004-6361/201116547

2011-01-01T23:59:59.000Z

99

Macintosh HD:Users:z095994:Desktop:Exits:2013_LAHotel_Info.docx Hotel Info in Los Alamos  

E-Print Network [OSTI]

, NM 87544 505-672-3838 Holiday Inn Express at Entrada Park 60 Entrada Dr. Los Alamos, NM 87544 505Macintosh HD:Users:z095994:Desktop:Exits:2013_LAHotel_Info.docx Hotel Info in Los Alamos of hotels in Los Alamos: Adobe Pines Bed & Breakfast 2101 Loma Linda Dr. Los Alamos, NM 87544 505

100

ISO-LWS detection of the 112 micron HD J=1-0 line toward the Orion Bar  

E-Print Network [OSTI]

We report the first detection outside of the solar system of the lowest pure rotational J=1-0 transition of the HD molecule at 112 microns. The detection was made toward the Orion Bar using the Fabry-Perot of the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). The line appears in emission with an integrated flux of (0.93+/-0.17)e-19 Watts per cm squared in the LWS beam, implying a beam-averaged column density in the v=0, J=1 state of (1.2+/-0.2)e17 molecules per cm squared. Assuming LTE excitation, the total HD column density is (2.9+/-0.8)e17 molecules per cm squared for temperatures between 85 and 300 K. Combined with the total warm molecular hydrogen (H2) column density of about (1.5-3.0)e22 molecules per cm squared derived from either the H2 pure rotational lines, C18O observations or dust continuum emission, the implied HD abundance, HD/H2, ranges from 0.7e-5 to 2.6e-5, with a preferred value of (2.0+/-0.6)e-5. The corresponding deuterium abundance of [D]/[H]=(1.0+/-0.3)e-5 is compared with recent values derived from ultraviolet absorption line observations of atomic HI and DI in interstellar clouds in the solar neighborhood and in Orion.

Christopher M. Wright; Ewine F. van Dishoeck; Pierre Cox; Sunil D. Sidher; Martin F. Kessler

1999-01-28T23:59:59.000Z

Note: This page contains sample records for the topic "hd ngv potential" from the National Library of EnergyBeta (NLEBeta).
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101

Chemical accelerator studies of isotope effects on collision dynamics of ionmolecule reactions: Kr++HD  

E-Print Network [OSTI]

The reaction of Kr+ with HD has been studied as a function of relative collision energy over the range 0.083.1 eV (c.m.) by measuring integral reaction cross sections and the velocity vector distributions of product ions ...

Chivalak, S.; Hierl, Peter M.

1977-01-01T23:59:59.000Z

102

On the Presence of Water and Global Circulation in the Transiting Planet HD 189733b  

E-Print Network [OSTI]

Detailed models are compared to recent infrared observations of the nearby extrasolar planet, HD 189733b. It is demonstrated that atmospheric water is present and that the planet's day side has a non-isothermal structure down to gas pressures of ~ 0.1 bars. Furthermore, model spectra with different amounts of CO are compared to the observations and an atmosphere absent of CO is excluded at roughly 2-sigma. Constraining the CO concentration beyond that is unfortunately not possible with the current Spitzer photometry. However, radically enhanced (or depleted) metal abundances are unlikely and the basic composition of this planet is probably similar to that of its host star. When combined with Spitzer observations, a recent ground-based upper limit for the K-band day side flux allows one to estimate the day-to-night energy redistribution efficiency to be ~ 43%.

Barman, Travis S

2008-01-01T23:59:59.000Z

103

On the Presence of Water and Global Circulation in the Transiting Planet HD 189733b  

E-Print Network [OSTI]

Detailed models are compared to recent infrared observations of the nearby extrasolar planet, HD 189733b. It is demonstrated that atmospheric water is present and that the planet's day side has a non-isothermal structure down to gas pressures of ~ 0.1 bars. Furthermore, model spectra with different amounts of CO are compared to the observations and an atmosphere absent of CO is excluded at roughly 2-sigma. Constraining the CO concentration beyond that is unfortunately not possible with the current Spitzer photometry. However, radically enhanced (or depleted) metal abundances are unlikely and the basic composition of this planet is probably similar to that of its host star. When combined with Spitzer observations, a recent ground-based upper limit for the K-band day side flux allows one to estimate the day-to-night energy redistribution efficiency to be ~ 43%.

Travis S. Barman

2008-02-06T23:59:59.000Z

104

Magnetic, Chemical and Rotational Properties of the Herbig Ae/Be Binary System HD 72106  

E-Print Network [OSTI]

Recently, strong, globally-ordered magnetic fields have been detected in some Herbig Ae and Be (HAeBe) stars, suggesting a possible evolutionary connection to main sequence magnetic chemically peculiar Ap and Bp stars. We have undertaken a detailed study of the binary system HD 72106, which contains a B9 magnetic primary and a HAeBe secondary, using the ESPaDOnS spectropolarimeter mounted on the CFHT. A careful analysis of the very young primary reveals that it has an approximately dipolar magnetic field geometry, strong chemical peculiarities, and strong surface chemical abundance inhomogeneities. Thus the primary is very similar to an Ap/Bp star despite having completed less then 1.5% of its main sequence life, and possibly still being on the pre-main sequence. In contrast, a similar analysis of the secondary reveals solar chemical abundances and no magnetic field.

Folsom, C P; Kochukhov, O; Alecian, E; Catala, C; Bagnulo, S; Landstreet, J D; Hanes, D A

2007-01-01T23:59:59.000Z

105

Asteroseismic analysis of the CoRoT \\delta-Scuti star HD174936  

E-Print Network [OSTI]

We present an analysis of the \\delta-Scuti star object HD 174936 (ID 7613) observed by CoRoT during the first short run SRc01 (27 days). A total number of 422 frequencies we are extracted from the light curve using standard prewhitening techniques. This number of frequencies was obtained by considering a spectral significance limit of sig = 10 using the software package SigSpec. Our analysis of the oscillation frequency spectrum reveals a spacing periodicity of around 52 \\muHz. Although modes considered here are not in the asymptotic regime, a comparison with stellar models confirms that this signature may stem from a quasi-periodic pattern similar to the so-called large separation in solar-like stars.

Hernndez, A Garca; Michel, E; Garrido, R; Surez, J C; Rodrguez, E; Amado, P J; Martn-Ruz, S; Rolland, A; Poretti, E; Samadi, R; Baglin, A; Auvergne, M; Catala, C; Lefvre, L; Baudin, F

2009-01-01T23:59:59.000Z

106

The Spitzer search for the transits of HARPS low-mass planets I. No transit for the super-Earth HD 40307b  

E-Print Network [OSTI]

We used Spitzer and its IRAC camera to search for the transit of the super-Earth HD 40307b. The hypothesis that the planet transits could not be firmly discarded from our first photometric monitoring of a transit window ...

Gillon, M.

107

Test Results of HD2, A High Field Nb3Sn Dipole with A 36 MM Bore  

SciTech Connect (OSTI)

The Superconducting Magnet Program at Lawrence Berkeley National Laboratory (LBNL) has developed the 1 m long Nb{sub 3}Sn dipole magnet HD2. With tilted (flared) ends to avoid obstructing a 36 mm clear bore, HD2 represents a step towards the use of block-type coils in high-field accelerator magnets. The coil design has been optimized to minimize geometric harmonics and reduce the conductor peak field in the end region, resulting in an expected short sample dipole field of 15 T. The support structure is composed by an external aluminum shell pre-tensioned with pressurized bladders and interference keys, and by two stainless steel end plates compressing the coil ends through four aluminum axial rods. We report on magnet design, assembly, and test results, including training performance, quench locations, and strain gauge measurements.

Ferracin, Paolo

2008-05-19T23:59:59.000Z

108

IMPROVED Ti II log(gf) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937  

SciTech Connect (OSTI)

Atomic transition probability measurements for 364 lines of Ti II in the UV through near-IR are reported. Branching fractions from data recorded using a Fourier transform spectrometer (FTS) and a new echelle spectrometer are combined with published radiative lifetimes to determine these transition probabilities. The new results are in generally good agreement with previously reported FTS measurements. Use of the new echelle spectrometer, independent radiometric calibration methods, and independent data analysis routines enables a reduction of systematic errors and overall improvement in transition probability accuracy over previous measurements. The new Ti II data are applied to high-resolution visible and UV spectra of the Sun and metal-poor star HD 84937 to derive new, more accurate Ti abundances. Lines covering a range of wavelength and excitation potential are used to search for non-LTE effects. The Ti abundances derived using Ti II for these two stars match those derived using Ti I and support the relative Ti/Fe abundance ratio versus metallicity seen in previous studies.

Wood, M. P.; Lawler, J. E. [Department of Physics, University of Wisconsin, Madison, WI 53706 (United States); Sneden, C. [Department of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712 (United States); Cowan, J. J., E-mail: mpwood@wisc.edu, E-mail: jelawler@wisc.edu, E-mail: chris@verdi.as.utexas.edu, E-mail: cowan@nhn.ou.edu [Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019 (United States)

2013-10-01T23:59:59.000Z

109

Determination of deuteron quadrupole moment from calculations of the electric field gradient in D{sub 2} and HD  

SciTech Connect (OSTI)

We have carried out an accurate determination of the quadrupole moment of the deuteron nucleus. The evaluation of the constant is achieved by combining high accuracy Born-Oppenheimer calculations of the electric field gradient at the nucleus in the H{sub 2} molecule with spectroscopic measurements of the quadrupolar splitting in D{sub 2} and HD. The derived value is Q=0.285783(30) fm{sup 2}.

Pavanello, Michele; Tung Weicheng; Adamowicz, Ludwik [Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721 (United States)

2010-04-15T23:59:59.000Z

110

Warm H2O and OH in the disk around the Herbig star HD 163296  

E-Print Network [OSTI]

We present observations of far-infrared (50-200 micron) OH and H2O emission of the disk around the Herbig Ae star HD 163296 obtained with Herschel/PACS in the context of the DIGIT key program. In addition to strong [OI] emission, a number of OH doublets and a few weak highly excited lines of H2O are detected. The presence of warm H2O in this Herbig disk is confirmed by a line stacking analysis, enabled by the full PACS spectral scan, and by lines seen in Spitzer data. The line fluxes are analyzed using an LTE slab model including line opacity. The water column density is 10^14 - 10^15 cm^-2, and the excitation temperature is 200-300 K implying warm gas with a density n > 10^5 cm^-3. For OH we find a column density of 10^14 - 2x10^15 cm^-2 and T_ex ~ 300-500 K. For both species we find an emitting region of r ~ 15-20 AU from the star. We argue that the molecular emission arises from the protoplanetary disk rather than from an outflow. This far-infrared detection of both H2O and OH contrasts with near- and mid-...

Fedele, D; van Dishoeck, E F; Herczeg, G J; Evans, N J; Bouwman, J; Henning, Th; Green, J

2012-01-01T23:59:59.000Z

111

Comparative Study of Hybrid Powertrains on Fuel Saving, Emissions, and Component Energy Loss in HD Trucks  

SciTech Connect (OSTI)

We compared parallel and series hybrid powertrains on fuel economy, component energy loss, and emissions control in Class 8 trucks over both city and highway driving. A comprehensive set of component models describing battery energy, engine fuel efficiency, emissions control, and power demand interactions for heavy duty (HD) hybrids has been integrated with parallel and series hybrid Class 8 trucks in order to identify the technical barriers of these hybrid powertrain technologies. The results show that series hybrid is absolutely negative for fuel economy benefit of long-haul trucks due to an efficiency penalty associated with the dual-step conversions of energy (i.e. mechanical to electric to mechanical). The current parallel hybrid technology combined with 50% auxiliary load reduction could elevate 5-7% fuel economy of long-haul trucks, but a profound improvement of long-haul truck fuel economy requires additional innovative technologies for reducing aerodynamic drag and rolling resistance losses. The simulated emissions control indicates that hybrid trucks reduce more CO and HC emissions than conventional trucks. The simulated results further indicate that the catalyzed DPF played an important role in CO oxidations. Limited NH3 emissions could be slipped from the Urea SCR, but the average NH3 emissions are below 20 ppm. Meanwhile our estimations show 1.5-1.9% of equivalent fuel-cost penalty due to urea consumption in the simulated SCR cases.

Gao, Zhiming [ORNL; FINNEY, Charles E A [ORNL; Daw, C Stuart [ORNL; LaClair, Tim J [ORNL; Smith, David E [ORNL

2014-01-01T23:59:59.000Z

112

Neutron-capture elements in the very metal-poor star HD122563  

E-Print Network [OSTI]

We obtained high resolution, high S/N spectroscopy for the very metal-poor star HD122563 with the Subaru Telescope High Dispersion Spectrograph. Previous studies have shown that this object has excesses of light neutron-capture elements, while its abundances of heavy ones are very low. In our spectrum covering 3070 - 4780 A of this object, 19 neutron-capture elements have been detected, including seven for the first time in this star (Nb, Mo, Ru, Pd, Ag, Pr, and Sm). Upper limits are given for five other elements including Th. The abundance pattern shows a gradually decreasing trend, as a function of atomic number, from Sr to Yb, which is quite different from those in stars with excesses of r-process elements. This abundance pattern of neutron-capture elements provides new strong constraints on the models of nucleosynthesis responsible for the very metal-poor stars with excesses of light neutron-capture elements but without enhancement of heavy ones.

S. Honda; W. Aoki; Y. Ishimaru; S. Wanajo; S. G. Ryan

2006-02-06T23:59:59.000Z

113

Surface structure of the CoRoT CP2 target star HD 50773  

E-Print Network [OSTI]

We compare surface maps of the chemically peculiar star HD 50773 produced with a Bayesian technique and based on high quality CoRoT photometry with those derived from rotation phase resolved spectropolarimetry. The goal is to investigate the correlation of surface brightness with surface chemical abundance distribution and the stellar magnetic field. The rotational period of the star was determined from a nearly 60 day long continuous light curve obtained during the initial run of CoRoT. Using a Bayesian approach to star-spot modelling, which in this work is applied for the first time for the photometric mapping of a CP star, we derived longitudes, latitudes and radii of four different spot areas. Additional parameters like stellar inclination and the spot's intensities were also determined. The CoRoT observations triggered an extensive ground-based spectroscopic and spectropolarimetric observing campaign and enabled us to obtain 19 different high resolution spectra in Stokes parameters I and V with NARVAL, E...

Lftinger, T; Weiss, W; Petit, P; Aurire, M; Nesvacil, N; Gruberbauer, M; Shulyak, D; Alecian, E; Baglin, A; Baudin, F; Catala, C; Donati, J -F; Kochukhov, O; Michel, E; Piskunov, N; Roudier, T; Samadi, R

2009-01-01T23:59:59.000Z

114

Solar-like oscillations with low amplitude in the CoRoT target HD 181906  

E-Print Network [OSTI]

Context: The F8 star HD 181906 (effective temperature ~6300K) was observed for 156 days by the CoRoT satellite during the first long run in the centre direction. Analysis of the data reveals a spectrum of solar-like acoustic oscillations. However, the faintness of the target (m_v=7.65) means the signal-to-noise (S/N) in the acoustic modes is quite low, and this low S/N leads to complications in the analysis. Aims: To extract global variables of the star as well as key parameters of the p modes observed in the power spectrum of the lightcurve. Methods: The power spectrum of the lightcurve, a wavelet transform and spot fitting have been used to obtain the average rotation rate of the star and its inclination angle. Then, the autocorrelation of the power spectrum and the power spectrum of the power spectrum were used to properly determine the large separation. Finally, estimations of the mode parameters have been done by maximizing the likelihood of a global fit, where several modes were fit simultaneously. Resu...

Garca, R A; Samadi, R; Ballot, J; Barban, C; Benomar, O; Chaplin, W J; Gaulme, P; Appourchaux, T; Mathur, S; Mosser, B; Toutain, T; Verner, G A; Auvergne, M; Baglin, A; Baudin, F; Boumier, P; Bruntt, H; Catala, C; Deheuvels, S; Elsworth, Y; Jimnez-Reyes, S J; Michel, E; Hernandez, F Perez; Roxburgh, I W; Salabert, D

2009-01-01T23:59:59.000Z

115

The magnetic field of the pre-main sequence Herbig Ae star HD 190073  

E-Print Network [OSTI]

The general context of this paper is the study of magnetic fields in the pre-main sequence intermediate mass Herbig Ae/Be stars. Magnetic fields are likely to play an important role in pre-main sequence evolution at these masses, in particular in controlling the gains and losses of stellar angular momentum. The particular aim of this paper is to announce the detection of a structured magnetic field in the Herbig Ae star HD 190073, and to discuss various scenarii for the geometry of the star, its environment and its magnetic field. We have used the ESPaDOnS spectropolarimeter at CFHT in 2005 and 2006 to obtain high-resolution and signal-to-noise circular polarization spectra which demonstrate unambiguously the presence of a magnetic field in the photosphere of this star. Nine circular polarization spectra were obtained, each one showing a clear Zeeman signature. This signature is suggestive of a magnetic field structured on large scales. The signature, which corresponds to a longitudinal magnetic field of 74+-...

Catala, C; Donati, J F; Wade, G A; Landstreet, J D; Bhm, T; Bouret, J C; Bagnulo, S; Folsom, C; Silvester, J

2006-01-01T23:59:59.000Z

116

Modeling the gas-phase chemistry of the transitional disk around HD 141569A  

E-Print Network [OSTI]

Aims: The chemistry, distribution and mass of the gas in the transitional disk around the 5 Myr old B9.5 V star HD 141569A are constrained. Methods: A quasi 2-dimensional (2D) chemistry code for photon dominated regions (PDR) is used to calculate the chemistry and gas temperatures in the disk. The calculations are performed for several gas distributions, PAH abundances and values of the total gas mass. The resulting CO J=2-1 and J=3-2 emission lines are computed with a 2D radiative transfer code and are compared to observations. Results: The CO abundance is very sensitive to the total disk mass because the disk is in a regime where self-shielding just sets in. The observed CO emission lines are best fit by a power-law gas distribution of 80 M_earth starting at 80 AU from the central star, indicating that there is some gas in the inner hole. Predictions are made for intensities of atomic fine-structure lines. [C I], which is the dominant form of carbon in large parts of the disk, is found to be a good alternative tracer of the gas mass.

B. Jonkheid; I. Kamp; J. -C. Augereau; E. F. van Dishoeck

2006-03-19T23:59:59.000Z

117

HD 50844: the new look of Delta Sct stars from CoRoT space photometry  

E-Print Network [OSTI]

It has also been suggested that the detection of a wealth of very low amplitude modes in Delta Sct stars was only a matter of signal--to--noise ratio. Access to this treasure, impossible from the ground, is one of the scientific aims of the space mission CoRoT, a space mission developed and operated by CNES. This work presents the results obtained on HD 50844: the 140,016 datapoints were analysed using independent approaches and several checks performed. A level of 10^{-5} mag was reached in the amplitude spectra of the CoRoT timeseries. The frequency analysis of the CoRoT timeseries revealed hundreds of terms in the frequency range 0--30 d^{-1}. All the cross--checks confirmed this new result. The initial guess that Delta Sct stars have a very rich frequency content is confirmed. The spectroscopic mode identification gives theoretical support since very high--degree modes (up to ell=14) are identified. We also prove that cancellation effects are not sufficient in removing the flux variations associated to th...

Poretti, E; Garrido, R; Lefvre, L; Mantegazza, L; Rainer, M; Rodrguez, E; Uytterhoeven, K; Amado, P J; Martin-Ruiz, S; Moya, A; Niemczura, E; Surez, J C; Zima, W; Baglin, A; Auvergne, M; Baudin, F; Catala, C; Samadi, R; Alvarez, M; Mathias, P; Paparo, M; Papics, P; Plachy, E

2009-01-01T23:59:59.000Z

118

A map of the day-night contrast of the extrasolar planet HD 189733b  

E-Print Network [OSTI]

"Hot Jupiter" extrasolar planets are expected to be tidally locked because they are close (Sun-Earth distance) to their parent stars, resulting in permanent daysides and nightsides. By observing systems where the planet and star periodically eclipse each other, several groups have been able to estimate the temperatures of the daysides of these planets. A key question is whether the atmosphere is able to transport the energy incident upon the dayside to the nightside, which will determine the temperature at different points on the planet's surface. Here we report observations of HD 189733, the closest of these eclipsing planetary systems, over half an orbital period, from which we can construct a 'map' of the distribution of temperatures. We detected the increase in brightness as the dayside of the planet rotated into view. We estimate a minimum brightness temperature of 973 +/- 33 K and a maximum brightness temperature of 1212 +/- 11 K at a wavelength of 8 microns, indicating that energy from the irradiated dayside is efficiently redistributed throughout the atmosphere, in contrast to a recent claim for another hot Jupiter. Our data indicate that the peak hemisphere-integrated brightness occurs 16$\\pm$6 degrees before opposition, corresponding to a hot spot shifted east of the substellar point. The secondary eclipse (when the planet moves behind the star) occurs 120 +/- 24 s later than predicted, which may indicate a slightly eccentric orbit.

Heather A. Knutson; David Charbonneau; Lori E. Allen; Jonathan J. Fortney; Eric Agol; Nicolas B. Cowan; Adam P. Showman; Curtis S. Cooper; S. Thomas Megeath

2007-05-07T23:59:59.000Z

119

Discovery of a nearby twin of SN1987A's nebula around the luminous blue variable HD168625: Was Sk--69 202 an LBV?  

E-Print Network [OSTI]

Spitzer images of the luminous blue variable (LBV) candidate HD168625 reveal the existence of a bipolar nebula several times larger than its previously-known equatorial dust torus. The outer nebula of HD168625 has a full extent of about 80 arcsec or 0.85 pc, and one of the lobes has a well-defined polar ring. The nebula is a near twin of the triple-ring system around SN1987A. Because of these polar rings, and accounting for stellar/progenitor luminosity, HD168625 is an even closer twin of SN1987A than the B supergiant Sher 25 in NGC3603. HD168625's nebula was probably ejected during a giant LBV eruption and not during a red supergiant phase, so its similarity to the nebula around SN1987A may open new possibilities for the creation of SN1987A's rings. Namely, the hypothesis that Sk-69 202 suffered an LBV-like eruption would avert the complete surrender of single star models for its bipolar nebula by offering an alternative to an unlikely binary merger scenario. It also hints that LBVs are the likely progenitors of some type II supernovae, and that HD168625's nebula is a good example of a pre-explosion environment.

Nathan Smith

2006-11-16T23:59:59.000Z

120

KEPLER-21b: A 1.6 R{sub Earth} PLANET TRANSITING THE BRIGHT OSCILLATING F SUBGIANT STAR HD 179070  

SciTech Connect (OSTI)

We present Kepler observations of the bright (V = 8.3), oscillating star HD 179070. The observations show transit-like events which reveal that the star is orbited every 2.8 days by a small, 1.6 R{sub Earth} object. Seismic studies of HD 179070 using short cadence Kepler observations show that HD 179070 has a frequency-power spectrum consistent with solar-like oscillations that are acoustic p-modes. Asteroseismic analysis provides robust values for the mass and radius of HD 179070, 1.34 {+-} 0.06 M{sub Sun} and 1.86 {+-} 0.04 R{sub Sun }, respectively, as well as yielding an age of 2.84 {+-} 0.34 Gyr for this F5 subgiant. Together with ground-based follow-up observations, analysis of the Kepler light curves and image data, and blend scenario models, we conservatively show at the >99.7% confidence level (3{sigma}) that the transit event is caused by a 1.64 {+-} 0.04 R{sub Earth} exoplanet in a 2.785755 {+-} 0.000032 day orbit. The exoplanet is only 0.04 AU away from the star and our spectroscopic observations provide an upper limit to its mass of {approx}10 M{sub Earth} (2{sigma}). HD 179070 is the brightest exoplanet host star yet discovered by Kepler.

Howell, Steve B. [National Optical Astronomy Observatory, Tucson, AZ 85719 (United States); Rowe, Jason F.; Bryson, Stephen T. [NASA Ames Research Center, Moffett Field, CA 94035 (United States); Quinn, Samuel N. [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Marcy, Geoffrey W.; Isaacson, Howard [Department of Astronomy, University of California, Berkeley, CA 94720 (United States); Ciardi, David R. [NASA Exoplanet Science Institute/Caltech, Pasadena, CA 91125 (United States); Chaplin, William J.; Elsworth, Yvonne [School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT (United Kingdom); Metcalfe, Travis S. [High Altitude Observatory and Scientific Computing Division, National Center for Atmospheric Research, Boulder, CO 80307 (United States); Monteiro, Mario J. P. F. G. [Centro de Astrofisica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto (Portugal); Appourchaux, Thierry [Institut d'Astrophysique Spatiale, Universite Paris XI-CNRS (UMR8617), Batiment 121, 91405 Orsay Cedex (France); Basu, Sarbani [Department of Astronomy, Yale University, New Haven, CT 06520-8101 (United States); Creevey, Orlagh L. [Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, Tenerife (Spain); Gilliland, Ronald L. [Space Telescope Science Institute, Baltimore, MD 21218 (United States); Quirion, Pierre-Olivier [Canadian Space Agency, 6767 Boulevard de l'Aeroport, Saint-Hubert, QC, J3Y 8Y9 (Canada); Stello, Denis [Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006 (Australia); Kjeldsen, Hans; Christensen-Dalsgaard, Joergen [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark); Garcia, Rafael A. [Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot-IRFU/SAp, 91191 Gif-sur-Yvette Cedex (France); and others

2012-02-20T23:59:59.000Z

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


121

A SELF-CONSISTENT MODEL OF THE CIRCUMSTELLAR DEBRIS CREATED BY A GIANT HYPERVELOCITY IMPACT IN THE HD 172555 SYSTEM  

SciTech Connect (OSTI)

Spectral modeling of the large infrared excess in the Spitzer IRS spectra of HD 172555 suggests that there is more than 10{sup 19} kg of submicron dust in the system. Using physical arguments and constraints from observations, we rule out the possibility of the infrared excess being created by a magma ocean planet or a circumplanetary disk or torus. We show that the infrared excess is consistent with a circumstellar debris disk or torus, located at {approx}6 AU, that was created by a planetary scale hypervelocity impact. We find that radiation pressure should remove submicron dust from the debris disk in less than one year. However, the system's mid-infrared photometric flux, dominated by submicron grains, has been stable within 4% over the last 27 years, from the Infrared Astronomical Satellite (1983) to WISE (2010). Our new spectral modeling work and calculations of the radiation pressure on fine dust in HD 172555 provide a self-consistent explanation for this apparent contradiction. We also explore the unconfirmed claim that {approx}10{sup 47} molecules of SiO vapor are needed to explain an emission feature at {approx}8 {mu}m in the Spitzer IRS spectrum of HD 172555. We find that unless there are {approx}10{sup 48} atoms or 0.05 M{sub Circled-Plus} of atomic Si and O vapor in the system, SiO vapor should be destroyed by photo-dissociation in less than 0.2 years. We argue that a second plausible explanation for the {approx}8 {mu}m feature can be emission from solid SiO, which naturally occurs in submicron silicate ''smokes'' created by quickly condensing vaporized silicate.

Johnson, B. C.; Melosh, H. J. [Department of Physics, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907 (United States); Lisse, C. M. [JHU-APL, 11100 Johns Hopkins Road, Laurel, MD 20723 (United States); Chen, C. H. [STScI, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Wyatt, M. C. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Thebault, P. [LESIA, Observatoire de Paris, F-92195 Meudon Principal Cedex (France); Henning, W. G. [NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771 (United States); Gaidos, E. [Department of Geology and Geophysics, University of Hawaii at Manoa, Honolulu, HI 96822 (United States); Elkins-Tanton, L. T. [Department of Terrestrial Magnetism, Carnegie Institution for Science, Washington, DC 20015 (United States); Bridges, J. C. [Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH (United Kingdom); Morlok, A., E-mail: johns477@purdue.edu [Department of Physical Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA (United Kingdom)

2012-12-10T23:59:59.000Z

122

INFRARED TRANSMISSION SPECTROSCOPY OF THE EXOPLANETS HD 209458b AND XO-1b USING THE WIDE FIELD CAMERA-3 ON THE HUBBLE SPACE TELESCOPE  

SciTech Connect (OSTI)

Exoplanetary transmission spectroscopy in the near-infrared using the Hubble Space Telescope (HST) NICMOS is currently ambiguous because different observational groups claim different results from the same data, depending on their analysis methodologies. Spatial scanning with HST/WFC3 provides an opportunity to resolve this ambiguity. We here report WFC3 spectroscopy of the giant planets HD 209458b and XO-1b in transit, using spatial scanning mode for maximum photon-collecting efficiency. We introduce an analysis technique that derives the exoplanetary transmission spectrum without the necessity of explicitly decorrelating instrumental effects, and achieves nearly photon-limited precision even at the high flux levels collected in spatial scan mode. Our errors are within 6% (XO-1) and 26% (HD 209458b) of the photon-limit at a resolving power of {lambda}/{delta}{lambda} {approx} 70, and are better than 0.01% per spectral channel. Both planets exhibit water absorption of approximately 200 ppm at the water peak near 1.38 {mu}m. Our result for XO-1b contradicts the much larger absorption derived from NICMOS spectroscopy. The weak water absorption we measure for HD 209458b is reminiscent of the weakness of sodium absorption in the first transmission spectroscopy of an exoplanet atmosphere by Charbonneau et al. Model atmospheres having uniformly distributed extra opacity of 0.012 cm{sup 2} g{sup -1} account approximately for both our water measurement and the sodium absorption. Our results for HD 209458b support the picture advocated by Pont et al. in which weak molecular absorptions are superposed on a transmission spectrum that is dominated by continuous opacity due to haze and/or dust. However, the extra opacity needed for HD 209458b is grayer than for HD 189733b, with a weaker Rayleigh component.

Deming, Drake; Wilkins, Ashlee [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); McCullough, Peter; Crouzet, Nicolas [Space Telescope Science Institute, Baltimore, MD 21218 (United States); Burrows, Adam [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544-1001 (United States); Fortney, Jonathan J. [Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States); Agol, Eric; Dobbs-Dixon, Ian [NASA Astrobiology Institute's Virtual Planetary Laboratory (United States); Madhusudhan, Nikku [Yale Center for Astronomy and Astrophysics, Yale University, New Haven, CT 06511 (United States); Desert, Jean-Michel; Knutson, Heather A.; Line, Michael [Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States); Gilliland, Ronald L. [Center for Exoplanets and Habitable Worlds, The Pennsylvania State University, University Park, PA 16802 (United States); Haynes, Korey [Department of Physics and Astronomy, George Mason University, Fairfax, VA 22030 (United States); Magic, Zazralt [Max-Planck-Institut fuer Astrophysik, D-85741 Garching (Germany); Mandell, Avi M.; Clampin, Mark [NASA's Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Ranjan, Sukrit; Charbonneau, David [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Seager, Sara, E-mail: ddeming@astro.umd.edu [Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States); and others

2013-09-10T23:59:59.000Z

123

The HARPS search for southern extra-solar planets XII. A giant planet orbiting the metal-poor star HD171028  

E-Print Network [OSTI]

In this paper we present the detection of a 1.8 M_Jup planet in a 538 day period trajectory orbiting the metal-poor star HD171028 ([Fe/H]=-0.49). This planet is the first to be discovered in the context of a HARPS program searching for planets around metal-poor stars. Interestingly, HD171028 is one of the least metal-poor stars in the sample. This discovery is placed in the context of the models of planet formation and evolution.

N. C. Santos; M. Mayor; F. Bouchy; F. Pepe; D. Queloz; S. Udry

2007-08-07T23:59:59.000Z

124

Environmental test report on the CTI-Cryogenics 1-watt integral Stirling cooler (long-life HD-1033d). Final report, 16 June-24 July 1988  

SciTech Connect (OSTI)

This final report describes and provides the data on the environmental testing of the CTI-Cryogenics 1-Watt Integral Stirling Cooler (Long-Life HD-1033D). The 1-Watt Integral Cooler (HD-1033B/C) is currently used in the M1 FLIR, M60 FLIR, and the Advanced Attack Helicopter FLIR. The long life cooler (clearance seal) improves life of the cooler by approximately two and one half times. C2NVEO evaluated the cooler performance at environmental extremes per the purchase description, PD-0182-001(CR). The cooler successfully passed all the environmental tests with no failures.

Doggett, G.; Dunmire, H.; Samuels, R.; Shaffer, J.

1989-04-01T23:59:59.000Z

125

RADIO SEARCH FOR H{sub 2}CCC TOWARD HD 183143 AS A CANDIDATE FOR A DIFFUSE INTERSTELLAR BAND CARRIER  

SciTech Connect (OSTI)

To clarify the authenticity of a recently proposed identification of H{sub 2}CCC (linear-C{sub 3}H{sub 2}) as a diffuse interstellar band (DIB) carrier, we searched for the rotational transition of H{sub 2}CCC at a frequency of 103 GHz toward HD 183143 using the 45 m telescope at the Nobeyama Radio Observatory. Although rms noise levels of 32 mK in the antenna temperature were achieved, detection of H{sub 2}CCC was unsuccessful, producing a 3{sigma} upper limit corresponding to a column density of 2.0 Multiplication-Sign 10{sup 13} cm{sup -2}. The upper limit indicates that the contribution of H{sub 2}CCC to the DIB at 5450 Angstrom-Sign is less than 1/25; thus, it is unlikely that the laboratory bands of the B{sup 1} B{sub 1}-X{sup 1} A{sub 1} transition of H{sub 2}CCC and the DIBs at 5450 Angstrom-Sign (and also 4881 Angstrom-Sign ) toward HD 183143 are related.

Araki, Mitsunori; Yamabe, Hiromichi; Tsukiyama, Koichi [Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku 162-8601, Tokyo (Japan); Takano, Shuro [Nobeyama Radio Observatory and Department of Astronomical Science, The Graduate University for Advanced Studies (Sokendai), 462-2 Nobeyama, Minamimaki, Minamisaku, Nagano 384-1305 (Japan); Kuze, Nobuhiko, E-mail: araki@rs.kagu.tus.ac.jp [Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku 102-8554, Tokyo (Japan)

2012-07-01T23:59:59.000Z

126

A LIKELY CLOSE-IN LOW-MASS STELLAR COMPANION TO THE TRANSITIONAL DISK STAR HD 142527  

SciTech Connect (OSTI)

With the uniquely high contrast within 0.''1 ({Delta}mag(L') = 5-6.5 mag) available using Sparse Aperture Masking with NACO at Very Large Telescope, we detected asymmetry in the flux from the Herbig Fe star HD 142527 with a barycenter emission situated at a projected separation of 88 {+-} 5 mas (12.8 {+-} 1.5 AU at 145 pc) and flux ratios in H, K, and L' of 0.016 {+-} 0.007, 0.012 {+-} 0.008, and 0.0086 {+-} 0.0011, respectively (3{sigma} errors), relative to the primary star and disk. After extensive closure-phase modeling, we interpret this detection as a close-in, low-mass stellar companion with an estimated mass of {approx}0.1-0.4 M{sub Sun }. HD 142527 has a complex disk structure, with an inner gap imaged in both the near and mid-IR as well as a spiral feature in the outer disk in the near-IR. This newly detected low-mass stellar companion may provide a critical explanation of the observed disk structure.

Biller, Beth; Benisty, Myriam; Chauvin, Gael; Olofsson, Johan; Pott, Joerg-Uwe; Mueller, Andre; Bonnefoy, Mickaeel; Henning, Thomas [Max-Planck-Institut fuer Astronomie, Koenigstuhl 17, 69117 Heidelberg (Germany); Lacour, Sylvestre; Thebault, Philippe [LESIA, CNRS/UMR-8109, Observatoire de Paris, UPMC, Universite Paris Diderot, 5 place Jules Janssen, 92195 Meudon (France); Juhasz, Attila [Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands); Sicilia-Aguilar, Aurora [Departamento de Fisica Teorica, Facultad de Ciencias, Universidad Autonoma de Madrid, 28049 Cantoblanco, Madrid (Spain); Tuthill, Peter [School of Physics, University of Sydney, NSW 2006 (Australia); Crida, Aurelien, E-mail: biller@mpia.de [Universite de Nice - Sophia antipolis/C.N.R.S./Observatoire de la Cote d'Azur, Laboratoire Lagrange (UMR 7293), Boulevard de l'Observatoire, B.P. 4229 06304 NICE cedex 04 (France)

2012-07-10T23:59:59.000Z

127

The HARPS search for southern extra-solar planets V. A 14 Earth-masses planet orbiting HD 4308  

E-Print Network [OSTI]

We present here the discovery and characterisation of a very light planet around HD4308. The planet orbits its star in 15.56 days. The circular radial-velocity variation presents a tiny semi-amplitude of 4.1 m/s that corresponds to a planetary minimum mass m2sin(i)=14.1 Earth masses. The planet was unveiled by high-precision radial-velocity measurements obtained with the HARPS spectrograph on the ESO 3.6-m telescope. The radial-velocity residuals around the Keplerian solution are 1.3 m/s, demonstrating the very high quality of the HARPS measurements. Activity and bisector indicators exclude any significant perturbations of stellar intrinsic origin, which supports the planetary interpretation. Contrary to most planet-host stars, HD4308 has a marked sub-solar metallicity ([Fe/H]=-0.31), raising the possibility that very light planet occurrence might show a different coupling with the parent star's metallicity than do giant gaseous extra-solar planets. Together with Neptune-mass planets close to their parent stars, the new planet occupies a position in the mass-separation parameter space that is constraining for planet-formation and evolution theories. The question of whether they can be considered as residuals of evaporated gaseous giant planets, ice giants, or super-earth planets is discussed in the context of the latest core-accretion models.

S. Udry; M. Mayor; W. Benz; J. -L. Bertaux; F. Bouchy; C. Lovis; C. Mordasini; F. Pepe; D. Queloz; J. -P. Sivan

2005-10-12T23:59:59.000Z

128

Stellar Parameters for HD 69830, a Nearby Star with Three Neptune Mass Planets and an Asteroid Belt  

E-Print Network [OSTI]

We used the CHARA Array to directly measure the angular diameter of HD 69830, home to three Neptune mass planets and an asteroid belt. Our measurement of 0.674+/-0.014 milli-arcseconds for the limb-darkened angular diameter of this star leads to a physical radius of R$_*$ = 0.9058$\\pm$0.0190 R\\sun and luminosity of L* = 0.622+/-0.014 Lsun when combined with a fit to the spectral energy distribution of the star. Placing these observed values on an Hertzsprung-Russel (HR) diagram along with stellar evolution isochrones produces an age of 10.6+/-4 Gyr and mass of 0.863$\\pm$0.043 M\\sun. We use archival optical echelle spectra of HD 69830 along with an iterative spectral fitting technique to measure the iron abundance ([Fe/H]=-0.04+/-0.03), effective temperature (5385+/-44 K) and surface gravity (log g = 4.49+/-0.06). We use these new values for the temperature and luminosity to calculate a more precise age of 7.5+/-Gyr. Applying the values of stellar luminosity and radius to recent models on the optimistic locati...

Tanner, Angelle; von Braun, Kaspar; Kane, Stephen; Brewer, John M; Farrington, Chris; van Belle, Gerard T; Beichman, Charles A; Fischer, Debra; Brummelaar, Theo A ten; McAlister, Harold A; Schaefer, Gail

2014-01-01T23:59:59.000Z

129

Detection of a magnetic field on HD108: clues to extreme magnetic braking and the Of?p phenomenon  

E-Print Network [OSTI]

We report the detection of a magnetic field on the Of?p star HD108. Spectropolarimetric observations conducted in 2007, 2008 and 2009 respectively with NARVAL@TBL and ESPaDOnS@CFHT reveal a clear Zeeman signature in the average Stokes V profile, stable on timescales of days to months and slowly increasing in amplitude on timescales of years. We speculate that this timescale is the same as that on which Ha emission is varying and is equal to the rotation period of the star. The corresponding longitudinal magnetic field, measured during each of the three seasons, increases slowly from 100 to 150G, implying that the polar strength of the putatively-dipolar large-scale magnetic field of HD108 is at least 0.5kG and most likely of the order of 1-2 kG. The stellar and wind properties are derived through a quantitative spectroscopic analysis with the code CMFGEN. The effective temperature is difficult to constrain because of the unusually strong HeI4471 and HeI5876 lines. Values in the range 33000-37000 K are preferr...

Martins, F; Marcolino, W L F; Bouret, J -C; Wade, G A; Escolano, C; Howarth, I D

2010-01-01T23:59:59.000Z

130

THE CALIFORNIA PLANET SURVEY. III. A POSSIBLE 2:1 RESONANCE IN THE EXOPLANETARY TRIPLE SYSTEM HD 37124  

SciTech Connect (OSTI)

We present new radial velocities from Keck Observatory and both Newtonian and Keplerian solutions for the triple-planet system orbiting HD 37124. The orbital solution for this system has improved dramatically since the third planet was first reported in Vogt et al. with an ambiguous orbital period. The period ambiguity is resolved, and the outer two planets have an apparent period commensurability of 2:1. A dynamical analysis finds both resonant and non-resonant configurations consistent with the radial velocity data and constrains the mutual inclinations of the planets to be <{approx}30{sup 0}. We discuss HD 37124 in the context of the other 19 exoplanetary systems with apparent period commensurabilities, which we summarize in a table. We show that roughly one in three well-characterized multiplanet systems has a apparent low-order period commensurability, which is more than would naively be expected if the periods of exoplanets in known multiplanet systems were drawn randomly from the observed distribution of planetary orbital periods.

Wright, J. T. [Department of Astronomy, 525 Davey Lab, The Pennsylvania State University, University Park, PA 16802 (United States); Veras, Dimitri; Ford, Eric B. [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, P.O. Box 112055, Gainesville, FL 32611-2055 (United States); Johnson, John Asher [Department of Astronomy, California Institute of Technology, MC 249-17, Pasadena, CA (United States); Marcy, G. W.; Howard, A. W.; Isaacson, H. [Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411 (United States); Fischer, D. A.; Spronck, J. [Department of Astronomy, Yale University, New Haven, CT 06511 (United States); Anderson, J.; Valenti, J. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)

2011-04-01T23:59:59.000Z

131

A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry  

E-Print Network [OSTI]

Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the star HD49933 twice. The oscillation spectrum of this star has proven difficult to interpret. Thanks to a new timeseries provided by CoRoT, we aim to provide a robust description of the oscillations in HD49933, i.e., to identify the degrees of the observed modes, and to measure mode frequencies, widths, amplitudes and the average rotational splitting. Several methods were used to model the Fourier spectrum: Maximum Likelihood Estimators and Bayesian analysis using Markov Chain Monte-Carlo techniques. The different methods yield consistent result, and allow us to make a robust identification of the modes and to extract precise mode parameters. Only the rotational splitting remains difficult to estimate precisely, but is clearly relatively large (several microHz in size).

Benomar, O; Campante, T L; Chaplin, W J; Garca, R A; Gaulme, P; Toutain, T; Verner, G A; Appourchaux, T; Ballot, J; Barban, C; Elsworth, Y; Mathur, S; Mosser, B; Rgulo, C; Roxburgh, I W; Auvergne, M; Baglin, A; Catala, C; Michel, E; Samadi, R

2009-01-01T23:59:59.000Z

132

The variability of the CoRoT target HD171834: gamma Dor pulsations and/or activity?  

E-Print Network [OSTI]

We present the preliminary results of a frequency and line-profile analysis of the CoRoT gamma Dor candidate HD171834. The data consist of 149 days of CoRoT light curves and a ground-based dataset of more than 1400 high-resolution spectra, obtained with six different instruments. Low-amplitude frequencies between 0 and 5 c/d, dominated by a frequency near 0.96 c/d and several of its harmonics, are detected. These findings suggest that HD171834 is not a mere gamma Dor pulsator and that stellar activity plays an important role in its variable behaviour. Based on CoRoT space data and on ground-based observations with ESO Telescopes at the La Silla Observatory under the ESO Large Programmes ESO LP 178.D-0361 and ESO LP 182.D-0356 (FEROS/2.2m and HARPS/3.6m), and data collected with FOCES/2.2m at the Centro Astronomico Hispano Aleman at Calar Alto, SOPHIE/1.93m at Observatoire de Haute Provence, FIES/NOT at Observatorio del Roque de los Muchachos, and HERCULES/1.0m at Mount John University Observatory.

Uytterhoeven, K; Baglin, A; Rainer, M; Poretti, E; Amado, P; Chapellier, E; Mantegazza, L; Pollard, K; Suarez, J C; Kilmartin, P M; Sato, K H; Garcia, R A; Auvergne, M; Michel, E; Samadi, R; Catala, C; Baudin, F

2011-01-01T23:59:59.000Z

133

Thorium-rich halo star HD221170: further evidence against the universality of the r-process  

E-Print Network [OSTI]

We report the abundance determination in the atmosphere of the bright halo star HD221170. The spectra were taken with the Terskol Observatory's 2.0-m telescope with a resolution R=45000 and signal-to-noise ratio up to 250 in the wavelength region 3638-10275 \\AA. The adopted atmospheric parameters correspond to an effective temperature \\Tef=4475 K, a surface gravity \\lgg=1.0, a microturbulent velocity \\vmi=1.7 \\kms, and a macroturbulent velocity \\vma=4 \\kms. The abundances of 43 chemical elements were determined with the method of spectrum synthesis. The large overabundances (by 1 dex relative to iron) of elements with Z$>38$ are shown to follow the same pattern as the solar r-abundances. The present HD221170 analysis confirms the non-universality of the r-process, or more exactly the observation that the astrophysical sites hosting the r-process do not always lead to a unique relative abundance distribution for the bulk Ba to Hg elements, the Pb-peak elements, and the actinides.

Alexander Yushchenko; Vera Gopka; Stephane Goriely; Faig Musaev; Angelina Shavrina; Chulhee Kim; Young Woon Kang; Juliana Kuznietsova; Vladimir Yushchenko

2004-09-22T23:59:59.000Z

134

A radio-map of the colliding winds in the very massive binary system HD 93129A  

E-Print Network [OSTI]

Radio observations are an effective tool to discover particle acceleration regions in colliding-wind binaries, through detection of synchrotron radiation; these regions are natural laboratories for the study of relativistic particles. Wind-collision region (WCR) models can reproduce the radio continuum spectra of massive binaries that contain both thermal and non-thermal radio emission; however, key constraints for models come from high-resolution imaging. Only five WCRs have been resolved to date at radio frequencies at milliarcsec (mas) angular scales. The source HD 93129A, prototype of the very few known O2 I stars, is a promising target for study: recently, a second massive, early-type star about 50 mas away was discovered, and a non-thermal radio source detected in the region. Preliminary long-baseline array data suggest that a significant fraction of the radio emission from the system comes from a putative WCR. We sought evidence that HD 93129A is a massive binary system with colliding stellar winds tha...

Benaglia, Paula; Moldon, Javier; Nelan, Ed; De Becker, Michael; Dougherty, Sean M; Koribalski, Baerbel

2015-01-01T23:59:59.000Z

135

Pulsation spectrum of Delta Sct stars: the binary HD 50870 as seen with CoRoT and HARPS  

E-Print Network [OSTI]

We present the results obtained with the CoRoT satellite for HD 50870, a Delta Sct star which was observed for 114.4 d. The 307,570 CoRoT datapoints were analysed with different techniques. The photometric observations were complemented over 15 nights of high-resolution spectroscopy with HARPS on a baseline of 25 d. Some uvby photometric observations were also obtained to better characterize the pulsation modes. HD 50870 proved to be a low-amplitude, long-period spectroscopic binary system seen almost pole-on (i~21 deg. The brighter component, which also has the higher rotational velocity (v sin i=37.5 km/s), is a delta Sct-type variable. There is a dominant axisymmetric mode (17.16 c/d). After the detection of about 250 terms (corresponding to an amplitude of about 0.045 mmag) a flat plateau appears in the power spectrum in the low-frequency region up to about 35 c/d. We were able to detect this plateau only thanks to the short cadence sampling of the CoRoT measurements (32 s). The density distribution vs. f...

Mantegazza, L; Michel, E; Rainer, M; Baudin, F; Hernandez, A Garcia; Semaan, T; Alvarez, M; Amado, P J; Garrido, R; Mathias, P; Moya, A; Suarez, J C; Auvergne, M; Baglin, A; Catala, C; Samadi, R

2012-01-01T23:59:59.000Z

136

Natural Gas as a Future Fuel for Heavy-Duty Vehicles  

SciTech Connect (OSTI)

In addition to their significant environmental impacts, medium-duty and heavy-duty (HD) vehicles are high volume fuel users. Development of such vehicles, which include transit buses, refuse trucks, and HD Class 6-8 trucks, that are fueled with natural gas is strategic to market introduction of natural gas vehicles (NGV). Over the past five years the Department of Energy's (DOE) Office of Heavy Vehicle Technologies (OHVT) has funded technological developments in NGV systems to support the growth of this sector in the highly competitive transportation market. The goals are to minimize emissions associated with NGV use, to improve on the economies of scale, and to continue supporting the testing and safety assessments of all new systems. This paper provides an overview of the status of major projects under a program supported by DOE/OHVT and managed by Brookhaven National Laboratory. The discussion focuses on the program's technical strategy in meeting specific goals proposed by the N GV industry and the government. Relevant projects include the development of low-cost fuel storage, fueling infrastructure, and HD vehicle applications.

Wai-Lin Litzke; James Wegrzyn

2001-05-14T23:59:59.000Z

137

TpPtMe(H)2: Why Is There H/D Scrambling of the Methyl Group but Not Methane Loss?  

E-Print Network [OSTI]

TpPtMe(H)2: Why Is There H/D Scrambling of the Methyl Group but Not Methane Loss? Mark A. Iron, H ) hydrido-tris(pyrazolyl)borate) was investigated. This complex is remarkably resistant to methane loss; heating it in methanol at 55 °C does not lead to either methane or hydrogen loss. When CD3OD is used

Keinan, Ehud

138

Charge asymmetry in rovibrationally excited HD{sup +} determined using explicitly correlated all-particle Gaussian functions  

SciTech Connect (OSTI)

Very accurate non-Born-Oppenheimer quantum-mechanical calculations are performed to determine the average values of the interparticle distances and the proton-deuteron density function for the rovibrationally excited HD{sup +} ion. The states corresponding to excitations to all bound vibrational states (v = 0, , 22) and simultaneously excited to the first excited rotational state (N = 1) are considered. To describe each state up to 8000 explicitly correlated all-particle Gaussian functions are used. The nonlinear parameters of the Gaussians are variationally optimized using a procedure that employs the analytical energy gradient determined with respect to these parameters. The results show an increasing asymmetry in the electron distribution with the vibrational excitation as the electron density shifts towards deuteron and away from the proton.

Kirnosov, Nikita [Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States)] [Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States); Sharkey, Keeper L. [Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721 (United States)] [Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721 (United States); Adamowicz, Ludwik, E-mail: ludwik@u.arizona.edu [Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States) [Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States); Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721 (United States)

2013-11-28T23:59:59.000Z

139

Complete pure vibrational spectrum of HD calculated without the Born-Oppenheimer approximation and including relativistic corrections  

SciTech Connect (OSTI)

All 18 bound pure vibrational levels of the HD molecule have been calculated within the framework that does not assume the Born-Oppenheimer (BO) approximation. The nonrelativistic energies of the states have been corrected for the relativistic effects of the order of {alpha}{sup 2} (where {alpha} is the fine structure constant), calculated using the perturbation theory with the nonrelativistic non-BO wave functions being the zero-order approximation. The calculations were performed by expanding the non-BO wave functions in terms of one-center explicitly correlated Gaussian functions multiplied by even powers of the internuclear distance and by performing extensive optimization of the Gaussian nonlinear parameters. Up to 10 000 basis functions were used for each state.

Bubin, Sergiy [Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States); Stanke, Monika [Department of Physics, Nicholas Copernicus University, ul. Grudziadzka 5, PL-87-100 Torun (Poland); Adamowicz, Ludwik [Department of Chemistry, University of Arizona, Tucson, Arizona 85721 (United States); Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States)

2011-04-15T23:59:59.000Z

140

A Search for H-alpha Absorption in the Exosphere of the Transiting Extrasolar Planet HD 209458b  

E-Print Network [OSTI]

There is evidence that the transiting planet HD 209458b has a large exosphere of neutral hydrogen, based on a 15% decrement in Lyman-alpha flux that was observed by Vidal-Madjar et al. during transits. Here we report upper limits on H-alpha absorption by the exosphere. The results are based on optical spectra of the parent star obtained with the Subaru High Dispersion Spectrograph. Comparison of the spectra taken inside and outside of transit reveals no exospheric H-alpha signal greater than 0.1% within a 5.1A band (chosen to have the same Delta_lambda/lambda as the 15% Ly-alpha absorption). The corresponding limit on the column density of n=2 neutral hydrogen is N_2 <~ 10^9 cm^{-2}. This limit constrains proposed models involving a hot (~10^4 K) and hydrodynamically escaping exosphere.

Joshua N. Winn; Yasushi Suto; Edwin L. Turner; Norio Narita; Brenda L. Frye; Wako Aoki; Bunei Sato; Toru Yamada

2004-06-28T23:59:59.000Z

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141

Characterisation of the magnetic fields of the Herbig Be stars HD 200775 and V380 0ri  

E-Print Network [OSTI]

The origin of the magnetic fields of the chemically peculiar main sequence Ap/Bp stars is still matter of intense debate. The recent discoveries of magnetic fields in Herbig Ae/Be stars using high resolution data obtained with the spectropolarimeter ESPaDOnS at CFHT provide a strong argument in favour of the fossil field hypothesis. Using a simple oblique rotator model of a centered dipole, we fit the Stokes V LSD profiles of two of these magnetic HAeBe stars, HD 200775 and V380 Ori, as well as their variations on timescales from days to months. We find that in both cases the dipole hypothesis is acceptable and we determine the rotation period, the angle between rotation and magnetic axes and the intensity of the magnetic field at pole.

Alecian, E; Catala, C; Bagnulo, S; Bhm, T; Bouret, J C; Donati, J F; Folsom, C P; Landstreet, J D; Silvester, J

2006-01-01T23:59:59.000Z

142

The unusual hydrocarbon emission from the early carbon star HD 100764: The connection between aromatics and aliphatics  

E-Print Network [OSTI]

We have used the Infrared Spectrograph (IRS) on the Spitzer Space Telescope to obtain spectra of HD 100764, an apparently single carbon star with a circumstellar disk. The spectrum shows emission features from polycyclic aromatic hydrocarbons (PAHs) that are shifted to longer wavelengths than normally seen, as characteristic of ``class C'' systems in the classification scheme of Peeters et al. All seven of the known class C PAH sources are illuminated by radiation fields that are cooler than those which typically excite PAH emission features. The observed wavelength shifts are consistent with hydrocarbon mixtures containing both aromatic and aliphatic bonds. We propose that the class C PAH spectra are distinctive because the carbonaceous material has not been subjected to a strong ultraviolet radiation field, allowing relatively fragile aliphatic materials to survive.

G. C. Sloan; M. Jura; W. W. Duley; K. E. Kraemer; J. Bernard-Salas; W. J. Forrest; B. Sargent; A. Li; D. J. Barry; C. J. Bohac; D. M. Watson; J. R. Houck

2007-05-07T23:59:59.000Z

143

Suzaku Detection of an Intense X-Ray Flare from an A-type Star HD161084  

E-Print Network [OSTI]

We report a serendipitous detection of an intense X-ray flare from the Tycho reference source HD 161084 during a Suzaku observation of the Galactic Center region for 20 ks. The X-ray Imaging Spectrometer (XIS) recorded a flare from this A1-type dwarf or subgiant star with a flux of 1.4x10^{-12} erg s^{-1} cm^{-2} (0.5--10 keV) and a decay time scale of 0.5 hr. The spectrum is hard with a prominent Fe XXV K alpha emission line at 6.7 keV, which is explained by a 5 keV thin-thermal plasma model attenuated by a 1.4x10^{21} cm^{-2} extinction. The low extinction, which is consistent with the optical reddening, indicates that the source is a foreground star toward the Galactic Center region. Based on the spectroscopic parallax distance of 530 pc, the peak X-ray luminosity amounts to 1x10^{32} erg s^{-1} (0.5--10 keV). This is much larger than the X-ray luminosity of ordinary late-type main-sequence stars, and the X-ray emission is unattributable to a hidden late-type companion that comprises a wide binary system with the A-star. We discuss possible natures of HD 161084 and suggest that it is most likely an interacting binary with elevated magnetic activity in the companion such as the Algol-type system. The flux detected by Suzaku during the burst is 100 times larger than the quiescent level measured using the archived XMM-Newton and Chandra data. The large flux amplification makes this star a unique example among sources of this class.

Junichiro Miura; Masahiro Tsujimoto; Yohko Tsuboi; Yoshitomo Maeda; Yasuharu Sugawara; Katsuji Koyama; Shigeo Yamauchi

2007-11-08T23:59:59.000Z

144

THE DEEP BLUE COLOR OF HD 189733b: ALBEDO MEASUREMENTS WITH HUBBLE SPACE TELESCOPE/SPACE TELESCOPE IMAGING SPECTROGRAPH AT VISIBLE WAVELENGTHS  

SciTech Connect (OSTI)

We present a secondary eclipse observation for the hot Jupiter HD 189733b across the wavelength range 290-570 nm made using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. We measure geometric albedos of A{sub g} = 0.40 {+-} 0.12 across 290-450 nm and A{sub g} < 0.12 across 450-570 nm at 1{sigma} confidence. The albedo decrease toward longer wavelengths is also apparent when using six wavelength bins over the same wavelength range. This can be interpreted as evidence for optically thick reflective clouds on the dayside hemisphere with sodium absorption suppressing the scattered light signal beyond {approx}450 nm. Our best-fit albedo values imply that HD 189733b would appear a deep blue color at visible wavelengths.

Evans, Thomas M.; Aigrain, Suzanne; Barstow, Joanna K. [Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH (United Kingdom); Pont, Frederic; Sing, David K. [School of Physics, University of Exeter, EX4 4QL Exeter (United Kingdom); Desert, Jean-Michel; Knutson, Heather A. [Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States); Gibson, Neale [European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching (Germany); Heng, Kevin [University of Bern, Center for Space and Habitability, Sidlerstrasse 5, CH-3012 Bern (Switzerland); Lecavelier des Etangs, Alain, E-mail: tom.evans@astro.ox.ac.uk [Institut d'Astrophysique de Paris, UMR7095 CNRS, Universite Pierre et Marie Curie, 98 bis Boulevard Arago, F-75014 Paris (France)

2013-08-01T23:59:59.000Z

145

Neutron-capture elements in the very metal-poor star HD88609: another st ar with excesses of light neutron-capture elements  

E-Print Network [OSTI]

We obtained a high resolution, high signal-to-noise UV-blue spectrum of the extremely metal-poor red giant HD88609 to determine the abundances of heavy elements. Nineteen neutron-capture elements are detected in the spectrum. Our analysis revealed that this object has large excesses of light neutron-capture elements while heavy neutron-capture elements are deficient. The abundance pattern shows a continuously decreasing trend, as a function of atomic number, from Sr to Yb, which is quite different from those in stars with excesses of r-process elements. Such an abundance pattern is very similar to that of HD122563 that was studied by our previous work. The results indicate that the abundance pattern found in the two stars could represent the pattern produced by the nucleosynthesis process that provided light neutron-capture elements in the very early Galaxy.

Satoshi Honda; Wako Aoki; Yuhri Ishimaru; Shinya Wanajo

2007-05-27T23:59:59.000Z

146

The qWR star HD 45166. II. Fundamental stellar parameters and evidence of a latitude-dependent wind  

E-Print Network [OSTI]

The enigmatic object HD 45166 is a qWR star in a binary system with an orbital period of 1.596 day, and presents a rich emission-line spectrum in addition to absorption lines from the companion star (B7 V). As the system inclination is very small (i=0.77 +- 0.09 deg), HD 45166 is an ideal laboratory for wind-structure studies. The goal of the present paper is to determine the fundamental stellar and wind parameters of the qWR star. A radiative transfer model for the wind and photosphere of the qWR star was calculated using the non-LTE code CMFGEN. The wind asymmetry was also analyzed using a recently-developed version of CMFGEN to compute the emerging spectrum in two-dimensional geometry. The temporal-variance spectrum (TVS) was calculated for studying the line-profile variations. Abundances, stellar and wind parameters of the qWR star were obtained. The qWR star has an effective temperature of Teff=50000 +- 2000 K, a luminosity of log(L/Lsun)=3.75 +- 0.08, and a corresponding photospheric radius of Rphot=1.00 Rsun. The star is helium-rich (N(H)/N(He) = 2.0), while the CNO abundances are anomalous when compared either to solar values, to planetary nebulae, or to WR stars. The mass-loss rate is Mdot = 2.2 . 10^{-7} Msun/yr, and the wind terminal velocity is vinf=425 km/s. The comparison between the observed line profiles and models computed under different latitude-dependent wind densities strongly suggests the presence of an oblate wind density enhancement, with a density contrast of at least 8:1 from equator to pole. If a high velocity polar wind is present (~1200 km/s), the minimum density contrast is reduced to 4:1. The wind parameters determined are unusual when compared to O-type stars or to typical WR stars. (abridged)

J. H. Groh; A. S. Oliveira; J. E. Steiner

2008-04-10T23:59:59.000Z

147

RETIRED A STARS AND THEIR COMPANIONS. VI. A PAIR OF INTERACTING EXOPLANET PAIRS AROUND THE SUBGIANTS 24 SEXTANIS AND HD 200964  

SciTech Connect (OSTI)

We report radial velocity (RV) measurements of the G-type subgiants 24 Sextanis (= HD 90043) and HD 200964. Both are massive, evolved stars that exhibit periodic variations due to the presence of a pair of Jovian planets. Photometric monitoring with the T12 0.80 m APT at Fairborn Observatory demonstrates both stars to be constant in brightness to {<=}0.002 mag, thus strengthening the planetary interpretation of the RV variations. Based on our dynamical analysis of the RV time series, 24 Sex b, c have orbital periods of 452.8 days and 883.0 days, corresponding to semimajor axes 1.333 AU and 2.08 AU, and minimum masses 1.99 M{sub Jup} and 0.86 M{sub Jup}, assuming a stellar mass M{sub *}= 1.54 M{sub sun}. HD 200964 b, c have orbital periods of 613.8 days and 825.0 days, corresponding to semimajor axes 1.601 AU and 1.95 AU, and minimum masses 1.99 M{sub Jup} and 0.90 M{sub Jup}, assuming M{sub *}= 1.44 M{sub sun}. We also carry out dynamical simulations to properly account for gravitational interactions between the planets. Most, if not all, of the dynamically stable solutions include crossing orbits, suggesting that each system is locked in a mean-motion resonance that prevents close encounters and provides long-term stability. The planets in the 24 Sex system likely have a period ratio near 2:1, while the HD 200964 system is even more tightly packed with a period ratio close to 4:3. However, we caution that further RV observations and more detailed dynamical modeling will be required to provide definitive and unique orbital solutions for both cases, and to determine whether the two systems are truly resonant.

Johnson, John Asher [California Institute of Technology, Department of Astrophysics, MC 249-17, Pasadena, CA 91125 (United States); Payne, Matthew; Ford, Eric B. [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, P.O. Box 112055, Gainesville, FL 32611-2055 (United States); Howard, Andrew W.; Marcy, Geoffrey W. [Department of Astronomy, University of California, Mail Code 3411, Berkeley, CA 94720 (United States); Clubb, Kelsey I. [Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132 (United States); Bowler, Brendan P. [Institute for Astronomy, University of Hawai'i, Honolulu, HI 96822 (United States); Henry, Gregory W. [Center of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Boulevard, Box 9501, Nashville, TN 37209 (United States); Fischer, Debra A.; Brewer, John M.; Schwab, Christian [Department of Astronomy, Yale University, New Haven, CT 06511 (United States); Reffert, Sabine [ZAH-Landessternwarte, Koenigstuhl 12, D-69117 Heidelberg (Germany); Lowe, Thomas B., E-mail: johnjohn@astro.caltech.edu [UCO/Lick Observatory, Santa Cruz, CA 95064 (United States)

2011-01-15T23:59:59.000Z

148

Structural Insight into the Mechanism of Substrate Specificity and Catalytic Activity of an HD-Domain Phosphohydrolase: The 5;#8242;-Deoxyribonucleotidase YfbR from Escherichia coli  

SciTech Connect (OSTI)

HD-domain phosphohydrolases have nucleotidase and phosphodiesterase activities and play important roles in the metabolism of nucleotides and in signaling. We present three 2.1-{angstrom}-resolution crystal structures (one in the free state and two complexed with natural substrates) of an HD-domain phosphohydrolase, the Escherichia coli 5'-nucleotidase YfbR. The free-state structure of YfbR contains a large cavity accommodating the metal-coordinating HD motif (H33, H68, D69, and D137) and other conserved residues (R18, E72, and D77). Alanine scanning mutagenesis confirms that these residues are important for activity. Two structures of the catalytically inactive mutant E72A complexed with Co{sup 2+} and either thymidine-5'-monophosphate or 2'-deoxyriboadenosine-5'-monophosphate disclose the novel binding mode of deoxyribonucleotides in the active site. Residue R18 stabilizes the phosphate on the Co{sup 2+}, and residue D77 forms a strong hydrogen bond critical for binding the ribose. The indole side chain of W19 is located close to the 2'-carbon atom of the deoxyribose moiety and is proposed to act as the selectivity switch for deoxyribonucleotide, which is supported by comparison to YfdR, another 5'-nucleotidase in E. coli. The nucleotide bases of both deoxyriboadenosine-5'-monophosphate and thymidine-5'-monophosphate make no specific hydrogen bonds with the protein, explaining the lack of nucleotide base selectivity. The YfbR E72A substrate complex structures also suggest a plausible single-step nucleophilic substitution mechanism. This is the first proposed molecular mechanism for an HD-domain phosphohydrolase based directly on substrate-bound crystal structures.

Zimmerman, Matthew D.; Proudfoot, Michael; Yakunin, Alexander; Minor, Wladek (Toronto); (UV)

2011-08-16T23:59:59.000Z

149

Discovery of a strong magnetic field on the O star HD 191612: new clues to the future of theta1 Orionis C?  

E-Print Network [OSTI]

From observations made with the ESPaDOnS spectropolarimeter, recently installed on the 3.6-m Canada--France--Hawaii Telescope, we report the discovery of a strong magnetic field in the Of?p spectrum variable HD 191612 -- only the second known magnetic O star (following theta1 Ori C). The stability of the observed Zeeman signature over four nights of observation, together with the non-rotational shape of line profiles, argue that the rotation period of HD 191612 is significantly longer than the 9-d value previously proposed. We suggest that the recently identified 538-d spectral-variability period is the rotation period, in which case the observed line-of-sight magnetic field of -220+-38 G implies a large-scale field (assumed dipolar) with a polar strength of about -1.5 kG. If confirmed, this scenario suggests that HD 191612 is, essentially, an evolved version of the near-ZAMS magnetic O star theta1 Ori C, but with an even stronger field (about 15 kG at an age similar to that of theta1Ori C). We suggest that t...

Donati, J F; Bouret, J C; Petit, P; Catala, C; Landstreet, J D; Donati, JF; Howarth, ID; Bouret, JC; Landstreet, JD

2006-01-01T23:59:59.000Z

150

The dramatic change of the fossil magnetic field of HD 190073: evidence of the birth of the convective core in a Herbig star ?  

E-Print Network [OSTI]

In the context of the ESPaDOnS and Narval spectropolarimetric surveys of Herbig Ae/Be stars, we discovered and then monitored the magnetic field of HD 190073 over more than four years, from 2004 to 2009. Our observations all displayed similar Zeeman signatures in the Stokes V spectra, indicating that HD 190073 hosted an aligned dipole, stable over many years, consistent with a fossil origin. We obtained new observations of the star in 2011 and 2012 and detected clear variations of the Zeeman signature on timescales of days to weeks, indicating that the configuration of its field has changed between 2009 and 2011. Such a sudden change of external structure of a fossil field has never previously been observed in any intermediate or high-mass star. HD 190073 is an almost entirely radiative pre-main sequence star, probably hosting a growing convective core. We propose that this dramatic change is the result of the interaction between the fossil field and the ignition of a dynamo field generated in the newly-born ...

Alecian, E; Mathis, S; Catala, C; Kochukhov, O; Landstreet, J

2013-01-01T23:59:59.000Z

151

Boosting Deuteron Polarization in HD Targets: Experience of moving spins between H and D with RF methods during the E06-101 experiment at Jefferson Lab  

SciTech Connect (OSTI)

Solid HDice targets are polarized by bringing the HD crystal to thermal equilibrium at low temperature and high magnetic field, typically 10-20 mK and 15 Tesla, at Jefferson Lab. In this regime, due to its smaller magnetic moment, the resulting polarization for D is always at least three times smaller than for H. The controlled amount of polarizing catalysts, o-H2 and p-D2, used in the process of reaching a frozen-spin state, further limit the maximum achievable D polarization. Nonetheless, H and D polarizations can be transferred from one to the other by connecting the H and D sub-states of the HD system with RF. In a large target, the RF power needed for such transitions is effectively limited by non-uniformities in the RF field. High efficiency transfers can require substantial RF power levels, and a tuned-RF circuit is needed to prevent large temperature excursions of the holding cryostat. In this paper, we compare the advantages and limitations of two different RF transfer methods to increase D polarization, Forbidden Adiabatic and Saturated Forbidden RF Transitions. The experience with the HD targets used during the recently completed E06-101 experiment in Hall-B of Jefferson Lab is discussed.

Wei, Xiangdong; Bass, Christopher; D'Angelo, Annalisa; Deur, Alexandre; Dezern, Gary; Kageya, Tsuneo; Laine, Vivien; Lowry, Michael; Sandorfi, Andrew; Teachey, Robert; Wang, Haipeng; Whisnant, Charles

2014-06-01T23:59:59.000Z

152

Toxicology Studies on Lewisite and Sulfur Mustard Agents: Subchronic Toxicity of Sulfur Mustard (HD) In Rats Final Report  

SciTech Connect (OSTI)

Occupational health standards have not been established for sulfur mustard [bis(2- chlorethyl)-sulfide], a strong alkylating agent with known mutagenic properties. Seventytwo Sprague-Dawley rats of each sex, 6-7 weeks old, were divided into six groups (12/group/ sex) and gavaged with either 0, 0.003 , 0.01 , 0.03 , 0.1 or 0.3 mg/kg of sulfur mustard in sesame oil 5 days/week for 13 weeks. No dose-related mortality was observed. A significant decrease (P ( 0.05) in body weight was observed in both sexes of rats only in the 0.3 mg/kg group. Hematological evaluations and clinical chemistry measurements found no consistent treatment-related effects at the doses studied. The only treatment-related lesion associated with gavage exposure upon histopathologic evaluation was epithelial hyperplasia of the forestomach of both sexes at 0.3 mg/kg and males at 0.1 mg/kg. The hyperplastic change was minimal and characterized by cellular disorganization of the basilar layer, an apparent increase in mitotic activity of the basilar epithelial cells, and thickening of the epithelial layer due to the apparent increase in cellularity. The estimated NOEL for HD in this 90-day study is 0.1 mg/kg/day when administered orally.

Sasser, L. B.; Miller, R. A.; Kalkwarf, D, R.; Buschbom, R. L.; Cushing, J. A.

1989-06-30T23:59:59.000Z

153

Possible detection of phase changes from the non-transiting planet HD 46375b by CoRoT  

E-Print Network [OSTI]

The present work deals with the detection of phase changes in an exoplanetary system. HD 46375 is a solar analog known to host a non-transiting Saturn-mass exoplanet with a 3.0236 day period. It was observed by the CoRoT satellite for 34 days during the fall of 2008. We attempt to identify at optical wavelengths, the changing phases of the planet as it orbits its star. We then try to improve the star model by means of a seismic analysis of the same light curve and the use of ground-based spectropolarimetric observations. The data analysis relies on the Fourier spectrum and the folding of the time series. We find evidence of a sinusoidal signal compatible in terms of both amplitude and phase with light reflected by the planet. Its relative amplitude is Delta Fp/F* = [13.0, 26.8] ppm, implying an albedo A=[0.16, 0.33] or a dayside visible brightness temperature Tb ~ [1880,2030] K by assuming a radius R=1.1 R_Jup and an inclination i=45 deg. Its orbital phase differs from that of the radial-velocity signal by at...

Gaulme, P; Guillot, T; Mosser, B; Mary, D; Weiss, W W; Schmider, F -X; Bourguignon, S; Deeg, H J; Rgulo, C; Aigrain, S; Schneider, J; Bruntt, H; Deheuvels, S; Donati, J -F; Appourchaux, T; Auvergne, M; Baglin, A; Baudin, F; Catala, C; Michel, E; Samadi, R; 10.1051/0004-6361/201014303

2010-01-01T23:59:59.000Z

154

The CoRoT target HD175726: an active star with weak solar-like oscillations  

E-Print Network [OSTI]

Context. The CoRoT short runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report observations of the star HD175726 that lasted for 27 days during the first short run of the mission. The time series reveals a high-activity signal and the power spectrum presents an excess due to solar-like oscillations with a low signal-to-noise ratio. Aims. Our aim is to identify the most efficient tools to extract as much information as possible from the power density spectrum. Methods. The most productive method appears to be the autocorrelation of the time series, calculated as the spectrum of the filtered spectrum. This method is efficient, very rapid computationally, and will be useful for the analysis of other targets, observed with CoRoT or with forthcoming missions such as Kepler and Plato. Results. The mean large separation has been measured to be 97.2+-0.5 microHz, slightly below the expected value determined from solar scaling laws.We also show stro...

Mosser, B; Appourchaux, T; Barban, C; Baudin, F; Boumier, P; Bruntt, H; Catala, C; Deheuvels, S; Garca, R A; Gaulme, P; Regulo, C; Roxburgh, I; Samadi, R; Verner, G; Auvergne, M; Baglin, A; Ballot, J; Benomar, O; Mathur, S

2009-01-01T23:59:59.000Z

155

HD 174884: a strongly eccentric, short-period early-type binary system discovered by CoRoT  

E-Print Network [OSTI]

Accurate photometric CoRoT space observations of a secondary seismological target, HD 174884, led to the discovery that this star is an astrophysically important double-lined eclipsing spectroscopic binary in an eccentric orbit (e of about 0.3), unusual for its short (3.65705d) orbital period. The high eccentricity, coupled with the orientation of the binary orbit in space, explains the very unusual observed light curve with strongly unequal primary and secondary eclipses having the depth ratio of 1-to-100 in the CoRoT 'seismo' passband. Without the high accuracy of the CoRoT photometry, the secondary eclipse, 1.5 mmag deep, would have gone unnoticed. A spectroscopic follow-up program provided 45 high dispersion spectra. The analysis of the CoRoT light curve was performed with an adapted version of PHOEBE that supports CoRoT passbands. The final solution was obtained by simultaneous fitting of the light and the radial velocity curves. Individual star spectra were derived by spectrum disentangling. The uncerta...

Maceroni, C; Michel, E; Harmanec, P; Prsa, A; Briquet, M; Niemczura, E; Morel, T; Ladjal, D; Auvergne, M; Baglin, A; Baudin, F; Catala, C; Samadi, R; Aerts, C

2009-01-01T23:59:59.000Z

156

Magnesium in the atmosphere of the planet HD209458b: Observations of the thermosphere-exosphere transition region  

E-Print Network [OSTI]

We report new near ultraviolet HST/STIS observations of atmospheric absorptions during the planetary transit of HD209458b. We detect absorption in atomic magnesium (MgI), while no signal has been detected in the lines of singly ionized magnesium (MgII). We measure the MgI atmospheric absorption to be 6.2+/-2.9% in the velocity range from -62 to -19 km/s. The detection of atomic magnesium in the planetary upper atmosphere at a distance of several planetary radii gives a first view into the transition region between the thermosphere and the exobase, where atmospheric escape takes place. We estimate the electronic densities needed to compensate for the photo-ionization by dielectronic recombination of Mg+ to be in the range of 10^8-10^9 cm^{-3}. Our finding is in excellent agreement with model predictions at altitudes of several planetary radii. We observe MgI atoms escaping the planet, with a maximum radial velocity (in the stellar rest frame) of -60 km/s. Because magnesium is much heavier than hydrogen, the es...

Vidal-Madjar, A; Bourrier, V; Dsert, J -M; Ballester, G; Etangs, A Lecavelier des; Sing, D K; Ehrenreich, D; Ferlet, R; Hbrard, G; McConnell, J C

2013-01-01T23:59:59.000Z

157

The pre-main sequence star HD 34282: A very short period delta Scuti-type pulsator  

E-Print Network [OSTI]

HD 34282 has been found to pulsate during a systematic search for short-term photometric variability in Herbig Ae/Be stars with the goal of determining the position and size of the pre-main sequence instability strip. Simultaneous Stromgren photometry is used in the frequency analysis, yielding two frequencies with values of nu1=79.5 and nu2=71.3 c/d. The light curve with the largest amplitude is that of the u band. This behaviour, which is not common for delta Scuti stars, is explained as pulsation in a high radial order in stars near the blue edge of the instability strip. The main period, with a value of 18.12 min, represents the shortest period observed so far for a delta Scuti-type pulsator. A seismic modelling, including instability predictions and rotation effects, has been attempted. It is found that both main sequence and pre-main sequence models predict modes in the range of 56 to 82 c/d (between 648 and 949 microHz), corresponding to oscillations of radial order n from 6 to 8. The highest of the ob...

Amado, P J; Surez, J C; Martin-Ruiz, S; Garrido, R; Rodrguez, E; Catala, C; Goupil, M J

2004-01-01T23:59:59.000Z

158

ALMA observations of the molecular gas in the debris disk of the 30 Myr old star HD 21997  

E-Print Network [OSTI]

The 30 Myr old A3-type star HD 21997 is one of the two known debris dust disks having a measurable amount of cold molecular gas. With the goal of understanding the physical state, origin, and evolution of the gas in young debris disks, we obtained CO line observations with the Atacama Large Millimeter/submillimeter Array (ALMA). Here we report on the detection of 12CO and 13CO in the J=2-1 and J=3-2 transitions and C18O in the J=2-1 line. The gas exhibits a Keplerian velocity curve, one of the few direct measurements of Keplerian rotation in young debris disks. The measured CO brightness distribution could be reproduced by a simple star+disk system, whose parameters are r_in Sun, and i = 32.6 +/- 3.1 degrees. The total CO mass, as calculated from the optically thin C18O line, is about (4-8) x 10^-2 M_Earth, while the CO line ratios suggest a radiation temperature on the order of 6-9 K. Comparing our results with those obtained for the dust component of th...

Kspl, ; Juhsz, A; brahm, P; Apai, D; Csengeri, T; Grady, C A; Henning, Th; Hughes, A M; Kiss, Cs; Pascucci, I; Schmalzl, M

2013-01-01T23:59:59.000Z

159

X-RAY EMISSION FROM THE DOUBLE-BINARY OB-STAR SYSTEM QZ CAR (HD 93206)  

SciTech Connect (OSTI)

X-ray observations of the double-binary OB-star system QZ Car (HD 93206) obtained with the Chandra X-ray Observatory over a period of roughly 2 years are presented. The respective orbits of systems A (O9.7 I+b2 v, P{sub A} = 21 days) and B (O8 III+o9 v, P{sub B} = 6 days) are reasonably well sampled by the observations, allowing the origin of the X-ray emission to be examined in detail. The X-ray spectra can be well fitted by an attenuated three-temperature thermal plasma model, characterized by cool, moderate, and hot plasma components at kT {approx_equal} 0.2, 0.7, and 2 keV, respectively, and a circumstellar absorption of {approx_equal}0.2 x 10{sup 22} cm{sup -2}. Although the hot plasma component could be indicating the presence of wind-wind collision shocks in the system, the model fluxes calculated from spectral fits, with an average value of {approx_equal}7 x 10{sup -13} erg s{sup -1} cm{sup -2}, do not show a clear correlation with the orbits of the two constituent binaries. A semi-analytical model of QZ Car reveals that a stable momentum balance may not be established in either system A or B. Yet, despite this, system B is expected to produce an observed X-ray flux well in excess of the observations. If one considers the wind of the O8 III star to be disrupted by mass transfer, the model and observations are in far better agreement, which lends support to the previous suggestion of mass transfer in the O8 III + o9 v binary. We conclude that the X-ray emission from QZ Car can be reasonably well accounted for by a combination of contributions mainly from the single stars and the mutual wind-wind collision between systems A and B.

Parkin, E. R.; Naze, Y.; Rauw, G. [Institut d'Astrophysique et de Geophysique, Universite de Liege, 17, Allee du 6 Aout, B5c, B-4000 Sart Tilman (Belgium); Broos, P. S.; Townsley, L. K. [Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802 (United States); Pittard, J. M. [School of Physics and Astronomy, University of Leeds, Woodhouse Lane, Leeds LS2 9JT (United Kingdom); Moffat, A. F. J. [Departement de Physique, Universite de Montreal, C.P. 6128, Succ. Centre-Ville, Montreal, QC H3C 3J7 (Canada); Oskinova, L. M. [Institute for Physics and Astronomy, University of Potsdam, 14476 Potsdam (Germany); Waldron, W. L., E-mail: parkin@mso.anu.edu.au [Eureka Scientific Inc., 2452 Delmer Street, Oakland, CA 94602 (United States)

2011-05-01T23:59:59.000Z

160

DISCOVERY OF A CLOSE SUBSTELLAR COMPANION TO THE HOT SUBDWARF STAR HD 149382-THE DECISIVE INFLUENCE OF SUBSTELLAR OBJECTS ON LATE STELLAR EVOLUTION  

SciTech Connect (OSTI)

Substellar objects, like planets and brown dwarfs orbiting stars, are by-products of the star formation process. The evolution of their host stars may have an enormous impact on these small companions. Vice versa a planet might also influence stellar evolution as has recently been argued. Here, we report the discovery of an 8-23 Jupiter-mass substellar object orbiting the hot subdwarf HD 149382 in 2.391 d at a distance of only about five solar radii. Obviously, the companion must have survived engulfment in the red giant envelope. Moreover, the substellar companion has triggered envelope ejection and enabled the sdB star to form. Hot subdwarf stars have been identified as the sources of the unexpected ultraviolet (UV) emission in elliptical galaxies, but the formation of these stars is not fully understood. Being the brightest star of its class, HD 149382 offers the best conditions to detect the substellar companion. Hence, undisclosed substellar companions offer a natural solution for the long-standing formation problem of apparently single hot subdwarf stars. Planets and brown dwarfs may therefore alter the evolution of old stellar populations and may also significantly affect the UV emission of elliptical galaxies.

Geier, S.; Edelmann, H.; Heber, U. [Dr. Remeis-Sternwarte, Institute for Astronomy, University Erlangen-Nuernberg, Sternwartstr. 7, 96049 Bamberg (Germany); Morales-Rueda, L. [Department of Astrophysics, Faculty of Science, Radboud University Nijmegen, P.O. Box 9010, 6500 GL Nijmegen (Netherlands)], E-mail: geier@sternwarte.uni-erlangen.de

2009-09-01T23:59:59.000Z

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161

Know The Star, Know the Planet. IV. A Stellar Companion to the Host star of the Eccentric Exoplanet HD 8673b  

E-Print Network [OSTI]

HD 8673 hosts a massive exoplanet in a highly eccentric orbit (e=0.723). Based on two epochs of speckle interferometry a previous publication identi?ed a candidate stellar companion. We observed HD 8673 multiple times with the 10 m Keck II telescope, the 5 m Hale telescope, the 3.63 m AEOS telescope and the 1.5m Palomar telescope in a variety of ?lters with the aim of con?rming and characterizing the stellar companion. We did not detect the candidate companion, which we now conclude was a false detection, but we did detect a fainter companion. We collected astrometry and photometry of the companion on six epochs in a variety of ?lters. The measured di?erential photometry enabled us to determine that the companion is an early M dwarf with a mass estimate of 0.33-0.45 M?. The companion has a projected separation of 10 AU, which is one of the smallest projected separations of an exoplanet host binary system. Based on the limited astrometry collected, we are able to constrain the orbit of the stellar companion to...

Roberts,, Lewis C; Neyman, Christopher R; Wu, Yanqin; Riddle, Reed L; Shelton, J Christopher; Angione, John; Baranec, Christoph; Bouchez, Antonin; Bui, Khanh; Burruss, Rick; Burse, Mahesh; Chordia, Pravin; Croner, Ernest; Das, Hillol; Dekany, Richard G; Guiwits, Stephen; Hale, David; Henning, John; Law, Shrinivas Kulkarni Nicholas; McKenna, Dan; Milburn, Jennifer; Palmer, Dean; Punnadi, Sujit; Ramaprakash, A N; Roberts, Jennifer E; Tendulkar, Shriharsh P; Trinh, Thang; Troy, Mitchell; Truong, Tuan; Zolkower, Jeff

2015-01-01T23:59:59.000Z

162

The tip of the iceberg: the frequency content of the Delta Sct star HD 50844 from CoRoT space photometry  

E-Print Network [OSTI]

It has been suggested that the detection of a wealth of very low amplitude modes in Delta Sct stars was only a matter of signal--to--noise ratio. Access to this treasure, impossible from the ground, is one of the scientific aims of the space mission CoRoT, developed and operated by CNES. This work presents the results obtained on HD 50844: the 140,016 datapoints allowed us to reach the level of 10^{-5} mag in the amplitude spectra. The frequency analysis of the CoRoT timeseries revealed hundreds of terms in the frequency range 0--30 d^{-1}. The initial guess that Delta Sct stars have a very rich frequency content is confirmed. The spectroscopic mode identification gives theoretical support since very high--degree modes (up to ell=14) are identified. We also prove that cancellation effects are not sufficient in removing the flux variations associated to these modes at the noise level of the CoRoT measurements. The ground--based observations indicate that HD 50844 is an evolved star that is slightly underabunda...

Poretti, E; Rainer, M; Uytterhoeven, K; Michel, E; Baglin, A; Auvergne, M; Catala, C; Samadi, R; Rodrguez, E; Garrido, R; Amado, P; Martin-Ruiz, S; Moya, A; Suarez, C; Baudin, F; Zima, W; Alvarez, M; Mathias, P; Paparo, M; Papics, P; Plachy, E

2009-01-01T23:59:59.000Z

163

An in-depth study of HD 174966 with CoRoT photometry and HARPS spectroscopy. Large separation as a new observable for \\delta Sct stars  

E-Print Network [OSTI]

The aim of this work was to use a multi-approach technique to derive the most accurate values possible of the physical parameters of the \\delta Sct star HD174966. In addition, we searched for a periodic pattern in the frequency spectra with the goal of using it to determine the mean density of the star. First, we extracted the frequency content from the CoRoT light curve. Then, we derived the physical parameters of HD174966 and carried a mode identification out from the spectroscopic and photometric observations. We used this information to look for the models fulfilling all the conditions and discussed the inaccuracies of the method because of the rotation effects. In a final step, we searched for patterns in the frequency set using a Fourier transform, discussed its origin and studied the possibility of using the periodicity to obtain information about the physical parameters of the star. A total of 185 peaks were obtained from the Fourier analysis of the CoRoT light curve, being almost all reliable pulsati...

Hernndez, A Garca; Michel, E; Surez, J C; Poretti, E; Martn-Ruz, S; Amado, P J; Garrido, R; Rodrguez, E; Rainer, M; Uytterhoeven, K; Rodrigo, C; Solano, E; Rodn, J R; Mathias, P; Rolland, A; Auvergne, M; Baglin, A; Baudin, F; Catala, C; Samadi, R

2013-01-01T23:59:59.000Z

164

Absolute Biodiesel Potential Country Name  

E-Print Network [OSTI]

Absolute Biodiesel Potential Country Name Production Cost ($/liter) Potential Biodiesel Volume,234 0% 0% #12;Absolute Biodiesel Potential Country Name Production Cost ($/liter) Potential Biodiesel;Absolute Biodiesel Potential Country Name Production Cost ($/liter) Potential Biodiesel Volume (liters

Wisconsin at Madison, University of

165

Mapping Biomass Distribution Potential  

E-Print Network [OSTI]

Mapping Biomass Distribution Potential Michael Schaetzel Undergraduate ? Environmental Studies ? University of Kansas L O C A T S I O N BIOMASS ENERGY POTENTIAL o According to DOE, Biomass has the potential to provide 14% of... the nations power o Currently 1% of national power supply o Carbon neutral? combustion of biomass is part of the natural carbon cycle o Improved crop residue management has potential to benefit environment, producers, and economy Biomass Btu...

Schaetzel, Michael

2010-11-18T23:59:59.000Z

166

Distribution of Rovibrational Product States for the "Prompt" Reaction H + D2(W ) 0, j ) 0-4) f HD(W ) 1,2, j) + D near 1.6 eV Collision Energy  

E-Print Network [OSTI]

an inverted parabolic distribution of HD(V, jred) products where jred ) j/jmax, and jmax is the maximum is full of examples of how our understanding of reaction dynamics has advanced and deepened, often being and show that by extending the LOCNESS model to include a linear opacity function we can reproduce

Zare, Richard N.

167

U.S. to join research effort for fusion power Friday, January 31, 2003 file:///Macintosh%20HD/Desktop%20Folder/ITER%20Negotiations/MSNBC/  

E-Print Network [OSTI]

, the International Thermonuclear Experimental Reactor, is a fusion research project that is already a joint operationU.S. to join research effort for fusion power Friday, January 31, 2003 file:///Macintosh%20HD view of the proposed International Thermonuclear Experimental Reactor, with a central containment

168

Generalized Fusion Potentials  

E-Print Network [OSTI]

Recently, DiFrancesco and Zuber have characterized the RCFTs which have a description in terms of a fusion potential in one variable, and proposed a generalized potential to describe other theories. In this note we give a simple criterion to determine when such a generalized description is possible. We also determine which RCFTs can be described by a fusion potential in more than one variable, finding that in fact all RCFTs can be described in such a way, as conjectured by Gepner.

Ofer Aharony

1993-01-31T23:59:59.000Z

169

Field matric potential sensor  

DOE Patents [OSTI]

A method of determining matric potential of a sample, the method comprising placing the sample in a container, the container having an opening; and contacting the sample with a tensiometer via the opening. An apparatus for determining matric potential of a sample, the apparatus comprising a housing configured to receive a sample; a portable matric potential sensing device extending into the housing and having a porous member; and a wall closing the housing to insulate the sample and at least a portion of the matric potential sensing device including the porous member.

Hubbell, Joel M. (Idaho Falls, ID); Sisson, James B. (Idaho Falls, ID)

2001-01-01T23:59:59.000Z

170

Pistons modeled by potentials  

E-Print Network [OSTI]

In this article we consider a piston modelled by a potential in the presence of extra dimensions. We analyze the functional determinant and the Casimir effect for this configuration. In order to compute the determinant and Casimir force we employ the zeta function scheme. Essentially, the computation reduces to the analysis of the zeta function associated with a scalar field living on an interval $[0,L]$ in a background potential. Although, as a model for a piston, it seems reasonable to assume a potential having compact support within $[0,L]$, we provide a formalism that can be applied to any sufficiently smooth potential.

Guglielmo Fucci; Klaus Kirsten; Pedro Morales

2011-06-03T23:59:59.000Z

171

CoRoT's view on variable B8/9 stars: spots versus pulsations: Evidence for differential rotation in HD 174648  

E-Print Network [OSTI]

Context. There exist few variability studies of stars in the region in the Hertzsprung-Russell diagram between the A and B-star pulsational instability strips. With the aid of the high precision continuous measurements of the CoRoT space satellite, low amplitudes are more easily detected, making a study of this neglected region worthwhile. Aims. We collected a small sample of B stars observed by CoRoT to determine the origin of the different types of variability observed. Methods. We combine literature photometry and spectroscopy to measure the fundamental parameters of the stars in the sample, and compare asteroseismic modelling of the light curves with (differentially rotating) spotted star models. Results. We found strong evidence for the existence of spots and differential rotation in HD 174648, and formulated hypotheses for their origin. We show that the distinction between pulsations and rotational modulation is difficult to make solely based on the light curve, especially in slowly rotating stars.

Degroote, P; Samadi, R; Aerts, C; Kurtz, D W; Noels, A; Miglio, A; Montalban, J; Bloemen, S; Baglin, A; Baudin, F; Catala, C; Michel, E; Auvergne, M

2011-01-01T23:59:59.000Z

172

Hydropower Potential Screening Study  

E-Print Network [OSTI]

Hydropower Potential Screening Study Gillian Charles GRAC 5/28/14 #12;Latest Hydropower Potential Study Creating a Buzz 2014 DOE study on undeveloped stream reaches 84.7 GW undeveloped hydropower in undeveloped stream reaches hydropower in the PNW #12;Studies at both National

173

SOLAR ENERGY POTENTIALS  

E-Print Network [OSTI]

In recent years solar energy has experienced phenomenal growth due to the technological improvements resulting in cost reductions and also governments policies supportive of renewable energy development and utilization. In this paper we will present possibilities for development and deployment of solar energy. We will use Kosovo to compare the existing power production potential and future possible potential by using solar energy.

Loreta N. Gashi; Sabedin A. Meha; Besnik A. Duriqi; Fatos S. Haxhimusa

174

Potential Conservation Laws  

E-Print Network [OSTI]

We prove that potential conservation laws have characteristics depending only on local variables if and only if they are induced by local conservation laws. Therefore, characteristics of pure potential conservation laws have to essentially depend on potential variables. This statement provides a significant generalization of results of the recent paper by Bluman, Cheviakov and Ivanova [J. Math. Phys., 2006, V.47, 113505]. Moreover, we present extensions to gauged potential systems, Abelian and general coverings and general foliated systems of differential equations. An example illustrating possible applications of proved statements is considered. A special version of the Hadamard lemma for fiber bundles and the notions of weighted jet spaces are proposed as new tools for the investigation of potential conservation laws.

Michael Kunzinger; Roman O. Popovych

2008-04-15T23:59:59.000Z

175

Potentiation of chlortetracycline  

E-Print Network [OSTI]

H of the crop, proventriculus, giszsrd and duodenum and the serum chlortetrscycline levels of chicks fed sulphuric acid, hydrochloric acid, acetic acid and oxalic acid sa- potentiating agents. 35 The pH of the crap, proventri. culus, gizzard and duodenum... snd the serum chlortetracycline levels of chicks fed ammonium sulphate and sodium oxalate as potentiating agents' 36 12 The effect of dienestrol diacetste on the level of chlortetracycline in serum from three week old chicks . ~ . ?~ ~ . . ~ . 49...

Hesketh, Harold Robert

1964-01-01T23:59:59.000Z

176

Fusion potentials I  

E-Print Network [OSTI]

We reconsider the conjecture by Gepner that the fusion ring of a rational conformal field theory is isomorphic to a ring of polynomials in $n$ variables quotiented by an ideal of constraints that derive from a potential. We show that in a variety of cases, this is indeed true with {\\it one-variable} polynomials.

P. Di Francesco; J. -B. Zuber

1992-11-30T23:59:59.000Z

177

TRANSPORTATION: THE POTENTIAL  

E-Print Network [OSTI]

INTERMODAL TRANSPORTATION: THE POTENTIAL AND THE CHALLENGE A Summary Report 2003 #12;June 2003 To the Reader This report summarizes the second James L. Oberstar Forum on Transportation Policy and Technology. Over two days, we explored the chal- lenges and opportunities in intermodal transportation, addressing

Minnesota, University of

178

LABORATORY III POTENTIAL ENERGY  

E-Print Network [OSTI]

LABORATORY III POTENTIAL ENERGY Lab III - 1 In previous problems, you have been introduced to the concepts of kinetic energy, which is associated with the motion of an object, and internal energy, which is associated with the internal structure of a system. In this section, you work with another form of energy

Minnesota, University of

179

Two Super-Earths Orbiting the Solar Analogue HD41248 on the edge of a 7:5 Mean Motion Resonance  

E-Print Network [OSTI]

The number of multi-planet systems known to be orbiting their host stars with orbital periods that place them in mean motion resonances is growing. For the most part, these systems are in first-order resonances and dynamical studies have focused their efforts towards understanding the origin and evolution of such dynamically resonant commensurabilities. We report here the discovery of two super-Earths that are close to a second-order dynamical resonance, orbiting the metal-poor ([Fe/H]=-0.43 dex) and inactive G2V star HD41428. We analysed 62 HARPS archival radial velocities for this star, that until now, had exhibited no evidence for planetary companions. Using our new Bayesian Doppler signal detection algorithm, we find two significant signals in the data, with periods of 18.357 days and 25.648 days, indicating they could be part of a 7:5 second-order mean motion resonance. Both semi-amplitudes are below 3m/s and the minimum masses of the pair are 12.3 and 8.6Mearth, respectively. Our simulations found that ...

Jenkins, James S; Brasser, Ramon; Ivanyuk, Oleksiy; Murgas, Felipe

2013-01-01T23:59:59.000Z

180

Constraining the structure of the transition disk HD 135344B (SAO 206462) by simultaneous modeling of multi-wavelength gas and dust observations  

E-Print Network [OSTI]

HD 135344B is an accreting (pre-) transition disk which displays emission of warm CO extending tens of AU inside its 30 AU dust cavity. We employ the dust radiative transfer code MCFOST and the thermo-chemical code ProDiMo to derive the disk structure from the simultaneous modeling of the spectral energy distribution (SED), VLT/CRIRES CO P(10) 4.75 micron, Herschel/PACS [O I] 63 micron, Spitzer-IRS, and JCMT 12CO J=3-2 spectra, VLTI/PIONIER H-band visibilities, and constraints from (sub-)mm continuum interferometry and near-IR imaging. We found a disk model able to describe simultaneously the current observations. This disk has the following structure: (1) to reproduce the SED, the near-IR interferometry data, and the CO ro-vibrational emission, refractory grains (we suggest carbon) are present inside the silicate sublimation radius (0.08 100 to account for the 870 micron continuum upper limit and the CO P(10) line flux; (5) the gas/dust ratio at 30

Carmona, A; Thi, W F; Benisty, M; Mnard, F; Grady, C; Kamp, I; Woitke, P; Olofsson, J; Roberge, A; Brittain, S; Dchene, G; Meeus, G; Martin-Zadi, C; Dent, B; Bouquin, J B Le; Berger, J P

2014-01-01T23:59:59.000Z

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


181

Rare-earth elements in the atmosphere of the magnetic chemically peculiar star HD 144897. New classification of the Nd III spectrum  

E-Print Network [OSTI]

We have obtained a UVES spectrum of a slowly rotating strongly magnetic Ap star, HD 144897, that exhibits very large overabundances of rare-earth elements. Here we present a detailed spectral analysis of this object, also taking into account effects of non-uniform vertical distribution (stratification) of chemical elements. We have determined the photospheric abundances of 40 ions. For seven elements (Mg, Si, Ca, Ti, Cr, Mn, Fe), we have obtained a stratification model that allow us to produce a satisfactory fit to the observed profiles of spectral lines of various strength. REEs abundances, that for the first time in the literature have been determined from the lines of the first and second ions, have been found typically four dex larger than solar abundances. Our analysis of REE spectral lines provide a strong support to the laboratory line classification and determination of the atomic parameters. The only remarkable exception is Nd III, for which spectral synthesis was found to be inconsistent with the observations. We have therefore performed a revision of the Nd III classification. We have confirmed the energies for 11 out of 24 odd energy levels classified previously, and we have derived the energies for additional 24 levels of Nd III, thereby increasing substantially the number of classified Nd III lines with corrected wavelengths and atomic parameters.

T. Ryabchikova; A. Ryabtsev; O. Kochukhov; S. Bagnulo

2006-04-26T23:59:59.000Z

182

Rare-earth elements in the atmosphere of the magnetic chemically peculiar star HD 144897. New classification of the Nd III spectrum  

E-Print Network [OSTI]

We have obtained a UVES spectrum of a slowly rotating strongly magnetic Ap star, HD 144897, that exhibits very large overabundances of rare-earth elements. Here we present a detailed spectral analysis of this object, also taking into account effects of non-uniform vertical distribution (stratification) of chemical elements. We have determined the photospheric abundances of 40 ions. For seven elements (Mg, Si, Ca, Ti, Cr, Mn, Fe), we have obtained a stratification model that allow us to produce a satisfactory fit to the observed profiles of spectral lines of various strength. REEs abundances, that for the first time in the literature have been determined from the lines of the first and second ions, have been found typically four dex larger than solar abundances. Our analysis of REE spectral lines provide a strong support to the laboratory line classification and determination of the atomic parameters. The only remarkable exception is Nd III, for which spectral synthesis was found to be inconsistent with the ob...

Ryabchikova, T A; Kochukhov, O; Ryabtsov, A V

2006-01-01T23:59:59.000Z

183

Ground-based observations of the beta Cephei CoRoT main target HD 180642: abundance analysis and mode identification  

E-Print Network [OSTI]

The known beta Cephei star HD 180642 was observed by the CoRoT satellite in 2007. From the very high-precision light curve, its pulsation frequency spectrum could be derived for the first time (Degroote and collaborators). In this paper, we obtain additional constraints for forthcoming asteroseismic modeling of the target. Our results are based on both extensive ground-based multicolour photometry and high-resolution spectroscopy. We determine T_eff = 24 500+-1000 K and log g = 3.45+-0.15 dex from spectroscopy. The derived chemical abundances are consistent with those for B stars in the solar neighbourhood, except for a mild nitrogen excess. A metallicity Z = 0.0099+-0.0016 is obtained. Three modes are detected in photometry. The degree l is unambiguously identified for two of them: l = 0 and l = 3 for the frequencies 5.48694 1/d and 0.30818 1/d, respectively. The radial mode is non-linear and highly dominant with an amplitude in the U-filter about 15 times larger than the strongest of the other modes. For th...

Briquet, M; Morel, T; Aerts, C; De Cat, P; Mathias, P; Lefever, K; Miglio, A; Poretti, E; Martin-Ruiz, S; Paparo, M; Rainer, M; Carrier, F; Gutirrez-Soto, J; Valtier, J C; Benko, J M; Bognr, Z; Niemczura, E; Amado, P J; Surez, J C; Moya, A; Rodriguez-Lopez, C; Garrido, R

2009-01-01T23:59:59.000Z

184

Extreme helium stars: non-LTE matters Helium and hydrogen spectra of the unique objects V652 Her and HD144941  

E-Print Network [OSTI]

Quantitative analyses of low-mass hydrogen-deficient (super-)giant stars - so-called extreme helium stars - to date face two major difficulties. First, theory fails to reproduce the observed helium lines in their entirety, wings and line cores. Second, a general mismatch exists for effective temperatures derived from ionization equilibria and from spectral energy distributions. Here, we demonstrate how the issue can be resolved using state-of-the-art non-LTE line-formation for these chemically peculiar objects. Two unique high-gravity B-type objects are discussed in detail, the pulsating variable V652 Her and the metal-poor star HD144941. In the first case atmospheric parameters from published LTE analyses are largely recovered, in the other a systematic offset is found. Hydrogen abundances are systematically smaller than previously reported, by up to a factor ~2. Extreme helium stars turn out to be important testbeds for non-LTE model atoms for helium. Improved non-LTE computations show that analyses assuming LTE or based on older non-LTE model atoms can predict equivalent widths, for the HeI 10830A transition in particular, in error by up to a factor ~3.

N. Przybilla; K. Butler; U. Heber; C. S. Jeffery

2005-10-03T23:59:59.000Z

185

On quantum potential dynamics  

E-Print Network [OSTI]

Non-relativistic de Broglie-Bohm theory describes particles moving under the guidance of the wave function. In de Broglie's original formulation, the particle dynamics is given by a first-order differential equation. In Bohm's reformulation, it is given by Newton's law of motion with an extra potential that depends on the wave function--the quantum potential--together with a constraint on the possible velocities. It was recently argued, mainly by numerical simulations, that relaxing this velocity constraint leads to a physically untenable theory. We provide further evidence for this by showing that for various wave functions the particles tend to escape the wave packet. In particular, we show that for a central classical potential and bound energy eigenstates the particle motion is often unbounded. This work seems particularly relevant for ways of simulating wave function evolution based on Bohm's formulation of the de Broglie-Bohm theory. Namely, the simulations may become unstable due to deviations from the velocity constraint.

Sheldon Goldstein; Ward Struyve

2014-11-05T23:59:59.000Z

186

WP 3 Report: Biomass Potentials Biomass production potentials  

E-Print Network [OSTI]

WP 3 Report: Biomass Potentials 1 Biomass production potentials in Central and Eastern Europe under different scenarios Final report of WP3 of the VIEWLS project, funded by DG-Tren #12;WP 3 Report: Biomass Potentials 2 Report Biomass production potentials in central and Eastern Europe under different scenarios

187

WINDExchange: Wind Potential Capacity  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLasDelivered energy consumption byAbout Printable Version Bookmark and Wind Potential Capacity

188

Energy Resource Potential  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsing Zirconia Nanoparticles asSecondCareerFebruary 2005 1EnergyResource Potential of

189

Ground potential rise monitor  

DOE Patents [OSTI]

A device and method for detecting ground potential rise (GPR) comprising positioning a first electrode and a second electrode at a distance from each other into the earth. The voltage of the first electrode and second electrode is attenuated by an attenuation factor creating an attenuated voltage. The true RMS voltage of the attenuated voltage is determined creating an attenuated true RMS voltage. The attenuated true RMS voltage is then multiplied by the attenuation factor creating a calculated true RMS voltage. If the calculated true RMS voltage is greater than a first predetermined voltage threshold, a first alarm is enabled at a local location. If user input is received at a remote location acknowledging the first alarm, a first alarm acknowledgment signal is transmitted. The first alarm acknowledgment signal is then received at which time the first alarm is disabled.

Allen, Zachery W. (Mandan, ND); Zevenbergen, Gary A. (Arvada, CO)

2012-04-03T23:59:59.000Z

190

Potential Vorticity in Magnetohydrodynamics  

E-Print Network [OSTI]

A version of Noether's second theorem using Lagrange multipliers is used to investigate fluid relabelling symmetries conservation laws in magnetohydrodynamics (MHD). We obtain a new generalized potential vorticity type conservation equation for MHD which takes into account entropy gradients and the ${\\bf J}\\times{\\bf B}$ force on the plasma due to the current ${\\bf J}$ and magnetic induction ${\\bf B}$. This new conservation law for MHD is derived by using Noether's second theorem in conjunction with a class of fluid relabelling symmetries in which the symmetry generator for the Lagrange label transformations is non-parallel to the magnetic field induction in Lagrange label space. This is associated with an Abelian Lie pseudo algebra and a foliated phase space in Lagrange label space. It contains as a special case Ertel's theorem in ideal fluid mechanics. An independent derivation shows that the new conservation law is also valid for more general physical situations.

G. M. Webb; R. L. Mace

2014-07-16T23:59:59.000Z

191

Colorado Potential Geothermal Pathways  

SciTech Connect (OSTI)

Citation Information: Originator: Earth Science &Observation Center (ESOC), CIRES, University of Colorado at Boulder Publication Date: 2012 Title: Colorado PRS Cool Fairways Edition: First Publication Information: Publication Place: Earth Science & Observation Center, Cooperative Institute for Research in Environmental Science (CIRES), University of Colorado, Boulder Publisher: Earth Science &Observation Center (ESOC), CIRES, University of Colorado at Boulder Description: This layer contains the weakened basement rocks. Isostatic gravity was utilized to identify structural basin areas, characterized by gravity low values reflecting weakened basement rocks. Together interpreted regional fault zones and basin outlines define geothermal "exploration fairways", where the potential exists for deep, superheated fluid flow in the absence of Pliocene or younger volcanic units Spatial Domain: Extent: Top: 4544698.569273 m Left: 144918.141004 m Right: 763728.391299 m Bottom: 4094070.397932 m Contact Information: Contact Organization: Earth Science &Observation Center (ESOC), CIRES, University of Colorado at Boulder Contact Person: Khalid Hussein Address: CIRES, Ekeley Building Earth Science & Observation Center (ESOC) 216 UCB City: Boulder State: CO Postal Code: 80309-0216 Country: USA Contact Telephone: 303-492-6782 Spatial Reference Information: Coordinate System: Universal Transverse Mercator (UTM) WGS1984 Zone 13N False Easting: 500000.00000000 False Northing: 0.00000000 Central Meridian: -105.00000000 Scale Factor: 0.99960000 Latitude of Origin: 0.00000000 Linear Unit: Meter Datum: World Geodetic System 1984 (WGS 1984) Prime Meridian: Greenwich Angular Unit: Degree Digital Form: Format Name: Shape file

Zehner, Richard E.

2012-02-01T23:59:59.000Z

192

Technical Potential for Local Distributed  

E-Print Network [OSTI]

the impact of high penetrations of solar PV on wholesale power markets (energy and capacity Technical Potential for Local Distributed Photovoltaics in California Preliminary.391.5100 www.ethree.com Technical Potential for Local Distributed Photovoltaics in California Preliminary

193

Hertz Potentials and Differential Geometry  

E-Print Network [OSTI]

I review the construction of Hertz potentials in vector calculus starting from Maxwell's equations. From here, I lay the minimal foundations of differential geometry to construct Hertz potentials for a general (spatially compact) Lorentzian...

Bouas, Jeffrey David

2011-08-08T23:59:59.000Z

194

Potential Impacts of CLIMATE CHANGE  

E-Print Network [OSTI]

Potential Impacts of CLIMATE CHANGE on U.S. Transportation Potential Impacts of CLIMATE CHANGE on U.S. Transportation TRANSPORTATION RESEARCH BOARD SPECIAL REPORT 290 #12;#12;Committee on Climate Change and U Washington, D.C. 2008 www.TRB.org Potential Impacts of CLIMATE CHANGE on U.S. Transportation TRANSPORTATION

Sheridan, Jennifer

195

RANGELAND SEQUESTRATION POTENTIAL ASSESSMENT  

SciTech Connect (OSTI)

Rangelands occupy approximately half of the world's land area and store greater than 10% of the terrestrial biomass carbon and up to 30% of the global soil organic carbon. Although soil carbon sequestration rates are generally low on rangelands in comparison to croplands, increases in terrestrial carbon in rangelands resulting from management can account for significant carbon sequestration given the magnitude of this land resource. Despite the significance rangelands can play in carbon sequestration, our understanding remains limited. Researchers conducted a literature review to identify sustainably management practices that conserve existing rangeland carbon pools, as well as increase or restore carbon sequestration potentials for this type of ecosystem. The research team also reviewed the impact of grazing management on rangeland carbon dynamics, which are not well understood due to heterogeneity in grassland types. The literature review on the impact of grazing showed a wide variation of results, ranging from positive to negative to no response. On further review, the intensity of grazing appears to be a major factor in controlling rangeland soil organic carbon dynamics. In 2003, researchers conducted field sampling to assess the effect of several drought years during the period 1993-2002. Results suggested that drought can significantly impact rangeland soil organic carbon (SOC) levels, and therefore, carbon sequestration. Resampling was conducted in 2006; results again suggested that climatic conditions may have overridden management effects on SOC due to the ecological lag of the severe drought of 2002. Analysis of grazing practices during this research effort suggested that there are beneficial effects of light grazing compared to heavy grazing and non-grazing with respect to increased SOC and nitrogen contents. In general, carbon storage in rangelands also increases with increased precipitation, although researchers identified threshold levels of precipitation where sequestration begins to decrease.

Lee Spangler; George F. Vance; Gerald E. Schuman; Justin D. Derner

2012-03-31T23:59:59.000Z

196

Harmonic potential and hadron spectroscopy  

E-Print Network [OSTI]

The quark-gluon sea in the hadrons is considered as periodically correlated. Energy levels of Shrodinger equation with harmonic potential is used for describing of the spectrum of hadron masses. In the considered cases the effective potential operating on each particle of ensemble, under certain conditions becomes square-law on displacement from a equilibrium point. It can become an explanation of popularity of oscillator potential for the description of a spectrum of masses of elementary particles. The analysis shows that levels of periodic potential better agreed to the spectrum of hadron masses, than levels of other potentials used for an explanation of a spectrum of masses.

Rafael Tumanyan

2009-05-28T23:59:59.000Z

197

Chapter 20: Electric Potential and Electric Potential Energy  

E-Print Network [OSTI]

1 Chapter 20: Electric Potential and Electric Potential Energy 2. A 4.5 C charge moves in a uniform electric field ( )5 ^4.1 10 N/C= E x . The change in electric potential energy of a charge that moves against an electric field is given by equation 20-1, 0U q Ed = . If the charge moves in the same

Kioussis, Nicholas

198

Target Space Duality III: Potentials  

E-Print Network [OSTI]

We generalize previous results on target space duality to the case where there are background fields and the sigma model lagrangian has a potential function.

Orlando Alvarez; Blazej Ruszczycki

2007-12-31T23:59:59.000Z

199

Powertrain Trends and Future Potential  

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

parties. Automotive Technology 12 Evolution in Clean Diesel & Gasoline Technology 1) turbo-charged with downsizing and var. valve timing (VVT); 2) max. potential w downsizing,...

200

Dealloying below the critical potential  

SciTech Connect (OSTI)

Conventionally, the critical potential represents the potential marking the onset of bulk dealloying. The current density below the critical potential is only weakly dependent on potential, and the physical processes responsible for this passive-like behavior are poorly understood. In situ scanning tunneling microscopy was used to study the nature of the surface morphology which develops at potentials less than the critical potential. At fixed potential, the time-dependent evolution of the surface morphology was correlated with the observed current decay. This allowed the authors to identify and model the physical processes which control the current decay. They find two general regimes of power law behavior in the current decay corresponding to exhaustion of an activation-controlled dissolution process (t{sup {minus}1}) and the operation of one of three mechanisms of surface mass-transport control (t{sup {minus}5/8}, t{sup {minus}1/2}, and t{sup {minus}1/4}). Potential-pulsing experiments were performed in order to examine the effect of a blocking noble-metal layer on the nucleation and growth of the porous structure associated with bulk dealloying. These results were analyzed using a Johnson-Mehl-Avrami analysis. The Avrami exponents found were fractional and in the range of 1.25 to 1.8. The fractional exponents were interpreted in terms of the fractal dimension characterizing the initial stages of porosity formation during bulk dealloying.

Wagner, K.; Brankovic, S.R.; Dimitrov, N.; Sieradzki, K. [Arizona State Univ., Tempe, AZ (United States)

1997-10-01T23:59:59.000Z

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


201

Quantification of the Potential Energy  

E-Print Network [OSTI]

(ICE). Energy from waste has an important role to play in improving energy security in the UK and1 waste up to 2020. To determine the potential2 contribution that energy recovery from residual shows that: potential energy recovery from these residual wastes could account for as much as 17

Columbia University

202

Completeness for sparse potential scattering  

SciTech Connect (OSTI)

The present paper is devoted to the scattering theory of a class of continuum Schrdinger operators with deterministic sparse potentials. We first establish the limiting absorption principle for both modified free resolvents and modified perturbed resolvents. This actually is a weak form of the classical limiting absorption principle. We then prove the existence and completeness of local wave operators, which, in particular, imply the existence of wave operators. Under additional assumptions on the sparse potential, we prove the completeness of wave operators. In the context of continuum Schrdinger operators with sparse potentials, this paper gives the first proof of the completeness of wave operators.

Shen, Zhongwei, E-mail: zzs0004@auburn.edu [Department of Mathematics and Statistics, Auburn University, Auburn, Alabama 36849 (United States)] [Department of Mathematics and Statistics, Auburn University, Auburn, Alabama 36849 (United States)

2014-01-15T23:59:59.000Z

203

Potential  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - September 2006PhotovoltaicSeptember 22, 2014SocietyJ. Dudhia515

204

THE POTENTIAL OF SOLAR ELECTRIC  

E-Print Network [OSTI]

.5 Energy and the Costs of Production.............................................................5 2 and Local Energy Benefits of PV.......................................15 5. CONCLUSIONS AND DISCUSSIONTHE POTENTIAL OF SOLAR ELECTRIC APPLICATIONS FOR DELAWARE'S POULTRY FARMS FINAL REPORT

Delaware, University of

205

Biomass Energy Crops: Massachusetts' Potential  

E-Print Network [OSTI]

Biomass Energy Crops: Massachusetts' Potential Prepared for: Massachusetts Division of Energy;#12;Executive Summary In Massachusetts, biomass energy has typically meant wood chips derived from the region's extensive forest cover. Yet nationally, biomass energy from dedicated energy crops and from crop residues

Schweik, Charles M.

206

A knowledge of the potential  

E-Print Network [OSTI]

is as important for understanding protein folding as is the potential surface for the H H2 reaction. estimated to protein folding, in which thousands of atoms take part. The under- standing of a reaction is based of experimental developments and theoretical advances.[1] By contrast, protein folding is so complex that even

Sali, Andrej

207

ASSESSMENT OF HOUSEHOLD CARBON FOOTPRINT REDUCTION POTENTIALS  

E-Print Network [OSTI]

EnergyEfficiencyPotentialStudy. TechnicalReportEnergyEfficiency PotentialStudy. TechnicalReportEnergyEfficiency RenewableEnergyTechnologies Transportation AssessmentofHouseholdCarbonFootprintReductionPotentialsisthefinalreport

Masanet, Eric

2010-01-01T23:59:59.000Z

208

Cassava, a potential biofuel crop in China  

E-Print Network [OSTI]

Cassava, a potential biofuel crop in China Christer Janssoncassava; bioethanol; biofuel; metabolic engineering; Chinathe potentials of cassava in the biofuel sector and point to

Jansson, C.

2010-01-01T23:59:59.000Z

209

Thermoelectric Generator (TEG) Fuel Displacement Potential using...  

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

(TEG) Fuel Displacement Potential using Engine-in-the-Loop and Simulation Thermoelectric Generator (TEG) Fuel Displacement Potential using Engine-in-the-Loop and Simulation...

210

Gas flow in barred potentials  

E-Print Network [OSTI]

We use a Cartesian grid to simulate the flow of gas in a barred Galactic potential and investigate the effects of varying the sound speed in the gas and the resolution of the grid. For all sound speeds and resolutions, streamlines closely follow closed orbits at large and small radii. At intermediate radii shocks arise and the streamlines shift between two families of closed orbits. The point at which the shocks appear and the streamlines shift between orbit families depends strongly on sound speed and resolution. For sufficiently large values of these two parameters, the transfer happens at the cusped orbit as hypothesised by Binney et al. over two decades ago. For sufficiently high resolutions the flow downstream of the shocks becomes unsteady. If this unsteadiness is physical, as appears to be the case, it provides a promising explanation for the asymmetry in the observed distribution of CO.

Sormani, Mattia C; Magorrian, John

2015-01-01T23:59:59.000Z

211

A black potential for spin less particles  

E-Print Network [OSTI]

We consider the most general non-Hermitian Hulthen potential to study the scattering of spin-less relativistic particles. The conditions for CC, SS and CPA are obtained analytically for this potential. We show that almost total absorption occurs for entire range of incidence energy for certain parameter ranges of the potential and hence term this as `black potential'. Time reversed of the same potential shows perfect emission for the entire range of particle energy. We also present the classical analog of this potential in terms of waveguide cross section.

Ananya Ghatak; Mohammad Hasan; Bhabani Prasad Mandal

2014-12-02T23:59:59.000Z

212

The potential of renewable energy  

SciTech Connect (OSTI)

On June 27 and 28, 1989, the US Department of Energy (DOE) national laboratories were convened to discuss plans for the development of a National Energy Strategy (NES) and, in particular, the analytic needs in support of NES that could be addressed by the laboratories. As a result of that meeting, interlaboratory teams were formed to produce analytic white papers on key topics, and a lead laboratory was designated for each core laboratory team. The broad-ranging renewables assignment is summarized by the following issue statement from the Office of Policy, Planning and Analysis: to what extent can renewable energy technologies contribute to diversifying sources of energy supply What are the major barriers to greater renewable energy use and what is the potential timing of widespread commercialization for various categories of applications This report presents the results of the intensive activity initiated by the June 1989 meeting to produce a white paper on renewable energy. Scores of scientists, analysts, and engineers in the five core laboratories gave generously of their time over the past eight months to produce this document. Their generous, constructive efforts are hereby gratefully acknowledged. 126 refs., 44 figs., 32 tabs.

Not Available

1990-03-01T23:59:59.000Z

213

STATEWIDE ENERGY EFFICIENCY POTENTIAL ESTIMATES AND TARGETS  

E-Print Network [OSTI]

rates of forecasted natural gas consumption, electricity consumption and peak electricity demand potential for electric consumption savings, 85 percent of the economic potential for peak demand savings Energy efficiency, energy savings, demand reduction, electricity consumption, natural gas consumption

214

Potential Energy Surfaces Donald G. Truhlar  

E-Print Network [OSTI]

. Meyers (Academic Press, New York, 2001), Vol. 13, pages 9-17. httpPotential Energy Surfaces Donald G. Truhlar University of Minnesota I. Introduction II. Quantum Mechanical Basis for Adiabatic Potential Energy Surfaces III. Topology of Adiabatic Potential Energy Surfaces

Truhlar, Donald G

215

Renewable Energy Potential for Brownfield Redevelopment Strategies  

E-Print Network [OSTI]

that must be met for a brownfield site to be considered as high potential for wind power redevelopmentRenewable Energy Potential for Brownfield Redevelopment Strategies Renewable energy resources to identify high-potential sites for renewable energy technologies and can help determine those technologies

216

Green roofs: potential at LANL  

SciTech Connect (OSTI)

Green roofs, roof systems that support vegetation, are rapidly becoming one of the most popular sustainable methods to combat urban environmental problems in North America. An extensive list of literature has been published in the past three decades recording the ecological benefits of green roofs; and now those benefits have been measured in enumerated data as a means to analyze the costs and returns of green roof technology. Most recently several studies have made substantial progress quantifying the monetary savings associated with storm water mitigation, the lessoning of the Urban Heat Island, and reduction of building cooling demands due to the implementation of green roof systems. Like any natural vegetation, a green roof is capable of absorbing the precipitation that falls on it. This capability has shown to significantly decrease the amount of storm water runoff produced by buildings as well as slow the rate at which runoff is dispensed. As a result of this reduction in volume and velocity, storm drains and sewage systems are relieved of any excess stress they might experience in a storm. For many municipalities and private building owners, any increase in storm water mitigation can result in major tax incentives and revenue that does not have to be spent on extra water treatments. Along with absorption of water, vegetation on green roofs is also capable of transpiration, the process by which moisture is evaporated into the air to cool ambient temperatures. This natural process aims to minimize the Urban Heat Island Effect, a phenomenon brought on by the dark and paved surfaces that increases air temperatures in urban cores. As the sun distributes solar radiation over a city's area, dark surfaces such as bitumen rooftops absorb solar rays and their heat. That heat is later released during the evening hours and the ambient temperatures do not cool as they normally would, creating an island of constant heat. Such excessively high temperatures induce heat strokes, heat exhaustion, and pollution that can agitate the respiratory system. The most significant savings associated with green roofs is in the reduction of cooling demands due to the green roof's thermal mass and their insulating properties. Unlike a conventional roof system, a green roof does not absorb solar radiation and transfer that heat into the interior of a building. Instead the vegetation acts as a shade barrier and stabilizes the roof temperature so that interior temperatures remain comfortable for the occupants. Consequently there is less of a demand for air conditioning, and thus less money spent on energy. At LANL the potential of green roof systems has already been realized with the construction of the accessible green roof on the Otowi building. To further explore the possibilities and prospective benefits of green roofs though, the initial capital costs must be invested. Three buildings, TA-03-1698, TA-03-0502, and TA-53-0031 have all been identified as sound candidates for a green roof retrofit project. It is recommended that LANL proceed with further analysis of these projects and implementation of the green roofs. Furthermore, it is recommended that an urban forestry program be initiated to provide supplemental support to the environmental goals of green roofs. The obstacles barring green roof construction are most often budgetary and structural concerns. Given proper resources, however, the engineers and design professionals at LANL would surely succeed in the proper implementation of green roof systems so as to optimize their ecological and monetary benefits for the entire organization.

Pacheco, Elena M [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

217

Potential Energy Total electric potential energy, U, of a system of  

E-Print Network [OSTI]

Potential Energy Total electric potential energy, U, of a system of charges is obtained from of work done by the field, W*= -W. Bring q1 from , W *= 0 since no electric F yet #12;Potential Energy Total electric potential energy, U, of a system of charges is obtained from the work done by an external

Bertulani, Carlos A. - Department of Physics and Astronomy, Texas A&M University

218

Bohm's Quantum Potential as an Internal Energy  

E-Print Network [OSTI]

We pursue our discussion of Fermi's surface initiated in Dennis, de Gosson and Hiley and show that Bohm's quantum potential can be viewed as an internal energy of a quantum system. This gives further insight into the role it played by the quantum potential in stationary states. It also allows us to provide a physically motivated derivation of Schr\\"odinger's equation for a particle in an external potential.

Glen Dennis; Maurice de Gosson; Basil Hiley

2014-12-15T23:59:59.000Z

219

Treecodes for Potential and Force Approximations  

E-Print Network [OSTI]

and patience during the PhD. period. She made every effort for me to concentrate on my work. I am indebted to my mother for sharing my vision. She had been a great source of inspiration for my study all these years. Also, I would like to thank my sisters and in... . . . . . . . . . . . . . . . . . . 14 II A TREECODE FOR POTENTIALS OF THE FORM r??* . . . 15 A. Multipole Expansion Theorem for r?1 Potential . . . . . . 16 B. Ultraspherical Polynomials . . . . . . . . . . . . . . . . . . 18 C. A Treecode for r?? Potentials...

Kannan, Kasthuri Srinivasan

2009-05-15T23:59:59.000Z

220

Feasibility of streaming potential measurements during hydrofracturing  

SciTech Connect (OSTI)

A simple model study shows that the onset of hydraulic fracturing and eventually fracture directions may be detected in streaming potential measurements. To model streaming potential responses of hydraulic fracturing, a theory of slowly time-varying electrokinetic phenomena and a self-consistent model to describe rock conductivities in terms of intrinsic rock properties are developed. Measureable streaming potential responses are generated during the hydraulic fracturing process. The fracturing process amplifies the observable streaming potential response by up to one order of magnitude when compared to a similar experiment without fracturing. The resolution of fractures is better in monitoring wells than on the surface.

Wurmstich, B.; Buettgenbach, T.; Morgan, F.D.

1995-12-31T23:59:59.000Z

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


221

Self-potential observations during hydraulic fracturing  

E-Print Network [OSTI]

potential measurements during hydraulic fracturing of BunterMonitoring during hydraulic fracturing using the TG-2 well,fracture processes in hydraulic fracturing, Quarterly Report

Moore, J R; Glaser, Steven D

2007-01-01T23:59:59.000Z

222

Self-potential observations during hydraulic fracturing  

E-Print Network [OSTI]

potential measurements during hydraulic fracturing of BunterMonitoring during hydraulic fracturing using the TG-2 well,fracture processes in hydraulic fracturing, Quarterly Report

Moore, Jeffrey R.; Glaser, Steven D.

2008-01-01T23:59:59.000Z

223

Potential of geothermal energy in China .  

E-Print Network [OSTI]

??This thesis provides an overview of geothermal power generation and the potential for geothermal energy utilization in China. Geothermal energy is thermal energy stored in (more)

Sung, Peter On

2010-01-01T23:59:59.000Z

224

Estimating Mitigation Potential of Agricultural Projects: an...  

Open Energy Info (EERE)

Mitigation Potential of Agricultural Projects: an Application of the EX-Ante Carbon-balance Tool (EX-ACT) AgencyCompany Organization: Food and Agriculture Organization of...

225

Harmonic and Potential Games - Optimization Online  

E-Print Network [OSTI]

game into three components, which we refer to as the potential, harmonic and ...... stability of the equilibrium under more general settings and convergence of...

2010-05-13T23:59:59.000Z

226

Energy dependence of nucleon-nucleon potentials  

E-Print Network [OSTI]

We investigate the energy dependence of potentials defined through the Bethe-Salpeter wave functions. We analytically evaluate such a potential in the Ising field theory in 2 dimensions and show that its energy dependence is weak at low energy. We then numerically calculate the nucleon-nucleon potential at non-zero energy using quenched QCD with anti-periodic boundary condition. In this case we also observe that the potentials are almost identical at $E\\simeq 0$ and $E\\simeq 50$ MeV, where $E$ is the center of mass kinetic energy.

Sinya Aoki; Janos Balog; Tetsuo Hatsuda; Noriyoshi Ishii; Keiko Murano; Hidekatsu Nemura; Peter Weisz

2008-12-03T23:59:59.000Z

227

The Higgs discovery potential of ATLAS  

E-Print Network [OSTI]

Higgs boson production and decay at the LHC is described, together with related ATLAS search channels, in order to provide an overview of the ATLAS Higgs discovery potential.

Christopher Collins-Tooth

2007-12-10T23:59:59.000Z

228

Alternative Ways of Financing Infrastructure Investment: Potential...  

Open Energy Info (EERE)

'Novel' Financing Models Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Alternative Ways of Financing Infrastructure Investment: Potential for 'Novel' Financing Models...

229

Self-potential observations during hydraulic fracturing  

E-Print Network [OSTI]

potential measurements during hydraulic fracturing of BunterSP response during hydraulic fracturing. Citation: Moore, J.observations during hydraulic fracturing, J. Geophys. Res. ,

Moore, J R; Glaser, Steven D

2007-01-01T23:59:59.000Z

230

Thermal Energy Storage Potential in Supermarkets.  

E-Print Network [OSTI]

?? The objective of this research is to evaluate the potential of thermal energy storage in supermarkets with CO2 refrigeration systems. Suitable energy storage techniques (more)

Ohannessian, Roupen

2014-01-01T23:59:59.000Z

231

Hydrogen Infrastructure Market Readiness: Opportunities and Potential...  

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

Opportunities and Potential for Near-term Cost Reductions. Proceedings of the Hydrogen Infrastructure Market Readiness Workshop and Summary of Feedback Provided through the...

232

Measuring Transport Protocol Potential for Energy Efficiency  

E-Print Network [OSTI]

Measuring Transport Protocol Potential for Energy Efficiency S. Kontogiannis, L. Mamatas, I. Psaras, Greece {skontog, emamatas, ipsaras, vtsaousi}@ee.duth.gr Abstract. We investigate the energy-saving potential of transport pro- tocols. We focus on the system-related aspect of energy. Do we have to damage

Tsaoussidis, Vassilis

233

Wave equations with energy dependent potentials  

E-Print Network [OSTI]

We study wave equations with energy dependent potentials. Simple analytical models are found useful to illustrate difficulties encountered with the calculation and interpretation of observables. A formal analysis shows under which conditions such equations can be handled as evolution equation of quantum theory with an energy dependent potential. Once these conditions are met, such theory can be transformed into ordinary quantum theory.

J. Formanek; R. J. Lombard; J. Mares

2003-09-22T23:59:59.000Z

234

Physics 321 Energy Conservation Potential Energy in  

E-Print Network [OSTI]

Physics 321 Hour 7 Energy Conservation ­ Potential Energy in One Dimension Work-Energy Theorem = 1 work increases kinetic energy, negative work decreases kinetic energy Gravity Depending on initial is independent of path. If we know we also know . 1 2 y x Potential Energy If T is dependent only on the end

Hart, Gus

235

POTENTIAL IMPACTS OF CLIMATE CHANGE ON  

E-Print Network [OSTI]

POTENTIAL IMPACTS OF CLIMATE CHANGE ON FLOODING IN WISCONSIN Ken Potter and Zach Schuster flood scenarios in Wisconsin · Potential impact of climate change on Wisconsin flooding · Ongoing #12;WISCONSIN INITIATIVE ON CLIMATE CHANGE IMPACTS · Partnership between the University of Wisconsin

Sheridan, Jennifer

236

Visualizing Motion in Potential Wells* Pratibha Jolly  

E-Print Network [OSTI]

, directly and plot the potential energy diagrams using a magnetic field sensor. The ease of measurement of potential #12;2 barriers and wells. The previous developers used a photo-interrupt and timing device for the sake of economy a single sensor was employed. Then, the experiment had to be repeated a large number

Zollman, Dean

237

Hydropower Potential Scoping Study Gauging Interest  

E-Print Network [OSTI]

6/19/2013 1 Hydropower Potential Scoping Study ­ Gauging Interest Generating Resources Advisory and associated technologies. ­ Hydropower upgrades, new hydropower projects 2 Purpose Develop a hydro supply curve to determine the hydropower development potential in the NW region ­ Council's Seventh Power Plan

238

Utrecht University's High Potential Programme Making Room  

E-Print Network [OSTI]

Utrecht University's High Potential Programme Making Room for Talent 2 #12;Making Room for Talent Utrecht University has a worldwide reputation for excellence in research across a broad range. This is why in 2003 Utrecht University created the High Potential Programme, an incentive scheme which gives

Utrecht, Universiteit

239

Dynamical Higgs potentials with a landscape  

E-Print Network [OSTI]

We consider one-loop effective potentials for adjoint Higgs fields that originate from flat holonomies in toroidal compactification of gauge theories. We show that such potentials are "landscape-like" for large gauge groups and generic non-supersymmetric matter representations. In particular, there is a large number of vacua with similar local properties, scanning a broad band of vacuum energies.

J. L. F. Barbon; C. Hoyos

2006-02-28T23:59:59.000Z

240

Neutrino matter potentials induced by Earth  

E-Print Network [OSTI]

An instructive method of deriving the matter potentials felt by neutrinos propagating through matter on Earth is presented. This paper thoroughly guides the reader through the calculations involving the effective weak Hamiltonian for lepton and quark scattering. The matter potentials are well-known results since the late 70's, but a detailed and pedagogical calculation of these quantities is hard to find. We derive potentials due to charged and neutral current scattering on electrons, neutrons and protons. Intended readership is for undergraduates/graduates in the fields of relativistic quantum mechanics and quantum field theory. In addition to the derivation of the potentials for neutrinos, we explicitely study the origin of the reversed sign for potentials in the case of antineutrino-scattering.

J. Linder

2006-01-15T23:59:59.000Z

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


241

PHYTOPLANKTON AND BIOMASS DISTRIBUTION AT POTENTIAL OTEC SITES  

E-Print Network [OSTI]

DISTRIBUTION AT POTENTIAL OTEC SITES P. W. Johnson and A.DISTRIBUTION AT POTENTIAL OTEC SITES LBL9054 P. W. Johnsonparameters at potential OTEC sites. Site Dactyliosolen

Johnson, P.W.

2010-01-01T23:59:59.000Z

242

Reassessing Wind Potential Estimates for India: Economic and Policy Implications  

E-Print Network [OSTI]

the need to reassess wind potential estimates in India andDivision Reassessing Wind Potential Estimates for India:July 2011 Reassessing Wind Potential Estimates for India:

Phadke, Amol

2012-01-01T23:59:59.000Z

243

Adiabatic hyperspherical analysis of realistic nuclear potentials  

E-Print Network [OSTI]

Using the hyperspherical adiabatic method with the realistic nuclear potentials Argonne V14, Argonne V18, and Argonne V18 with the Urbana IX three-body potential, we calculate the adiabatic potentials and the triton bound state energies. We find that a discrete variable representation with the slow variable discretization method along the hyperradial degree of freedom results in energies consistent with the literature. However, using a Laguerre basis results in missing energy, even when extrapolated to an infinite number of basis functions and channels. We do not include the isospin $T=3/2$ contribution in our analysis.

K. M. Daily; Alejandro Kievsky; Chris H. Greene

2015-03-20T23:59:59.000Z

244

Gravity as BF theory plus potential  

E-Print Network [OSTI]

Spin foam models of quantum gravity are based on Plebanski's formulation of general relativity as a constrained BF theory. We give an alternative formulation of gravity as BF theory plus a certain potential term for the B-field. When the potential is taken to be infinitely steep one recovers general relativity. For a generic potential the theory still describes gravity in that it propagates just two graviton polarizations. The arising class of theories is of the type amenable to spin foam quantization methods, and, we argue, may allow one to come to terms with renormalization in the spin foam context.

Kirill Krasnov

2009-07-23T23:59:59.000Z

245

Adiabatic hyperspherical analysis of realistic nuclear potentials  

E-Print Network [OSTI]

Using the hyperspherical adiabatic method with the realistic nuclear potentials Argonne V14, Argonne V18, and Argonne V18 with the Urbana IX three-body potential, we calculate the adiabatic potentials and the triton bound state energies. We find that a discrete variable representation with the slow variable discretization method along the hyperradial degree of freedom results in energies consistent with the literature. However, using a Laguerre basis results in missing energy, even when extrapolated to an infinite number of basis functions and channels. We do not include the isospin $T=3/2$ contribution in our analysis.

Daily, K M; Greene, Chris H

2015-01-01T23:59:59.000Z

246

Applying supersymmetry to energy dependent potentials  

SciTech Connect (OSTI)

We investigate the supersymmetry properties of energy dependent potentials in the D=1 dimensional space. We show the main aspects of supersymmetry to be preserved, namely the factorization of the Hamiltonian, the connections between eigenvalues and wave functions of the partner Hamiltonians. Two methods are proposed. The first one requires the extension of the usual rules via the concept of local equivalent potential. In this case, the superpotential becomes depending on the state. The second method, applicable when the potential depends linearly on the energy, is similar to what has been already achieved by means of the Darboux transform. -- Highlights: Supersymmetry extended to energy dependent potentials. Generalization of the concept of superpotential. An alternative method used for linear E-dependence leads to the same results as Darboux transform.

Yekken, R. [Facult de Physique, USTHB Bab Ezzouar, Alger (Algeria)] [Facult de Physique, USTHB Bab Ezzouar, Alger (Algeria); Lassaut, M. [Groupe de Physique Thorique, Institut de Physique Nuclaire, IN2P3 - CNRS, Universit Paris-Sud 11, 91406 Orsay Cedex (France)] [Groupe de Physique Thorique, Institut de Physique Nuclaire, IN2P3 - CNRS, Universit Paris-Sud 11, 91406 Orsay Cedex (France); Lombard, R.J., E-mail: roland.lombard@laposte.net [Groupe de Physique Thorique, Institut de Physique Nuclaire, IN2P3 - CNRS, Universit Paris-Sud 11, 91406 Orsay Cedex (France)

2013-11-15T23:59:59.000Z

247

Energy saving potential of various roof technologies  

E-Print Network [OSTI]

Unconventional roof technologies such as cool roofs and green roofs have been shown to reduce building heating and cooling load. Although previous studies suggest potential for energy savings through such technologies, ...

Ray, Stephen D. (Stephen Douglas)

2010-01-01T23:59:59.000Z

248

Riemann zeros, prime numbers and fractal potentials  

E-Print Network [OSTI]

Using two distinct inversion techniques, the local one-dimensional potentials for the Riemann zeros and prime number sequence are reconstructed. We establish that both inversion techniques, when applied to the same set of levels, lead to the same fractal potential. This provides numerical evidence that the potential obtained by inversion of a set of energy levels is unique in one-dimension. We also investigate the fractal properties of the reconstructed potentials and estimate the fractal dimensions to be $D=1.5$ for the Riemann zeros and $D = 1.8$ for the prime numbers. This result is somewhat surprising since the nearest-neighbour spacings of the Riemann zeros are known to be chaotically distributed whereas the primes obey almost poisson-like statistics. Our findings show that the fractal dimension is dependent on both the level-statistics and spectral rigidity, $\\Delta_3$, of the energy levels.

Brandon P. van Zyl; D. A. W. Hutchinson

2003-04-18T23:59:59.000Z

249

Biodegradation Potential of Perfluorooctanoate and Perfluorooctane Sulfonate  

E-Print Network [OSTI]

and fluorine present in PFOA and PFOS makes them stable and resistant to conventional treatment processes. Several advanced chemical processes can degrade PFOA and PFOS under high temperatures and pressures or other extreme conditions. However, the potential...

Thelakkat Kochunarayanan, Parvathy

2012-10-19T23:59:59.000Z

250

Gate potential control of nanofluidic devices  

E-Print Network [OSTI]

The effect of an external gate potential control on the nanofluidic nanochannels was experimentally investigated in this work. Like in the field effect transistors (FET) in microelectronics, molecular transport in ...

Le Coguic, Arnaud

2005-01-01T23:59:59.000Z

251

Quarkonium Dissociation at Finite Chemical Potential  

E-Print Network [OSTI]

We have studied the dissociation of quarkonia states in a deconfined medium of quarks and gluons at large baryon chemical potential and small temperature region. The aim of this study is to probe the dense baryonic medium expected to be produced at FAIR facility, GSI Darmstadt. This is done by correcting both the short and long-distance terms of the Cornell potential by a dielectric function, embodying the effects of deconfined quarks and gluons, at finite baryon chemical potential and temperature. It is found that $J/\\psi$ is dissociated approximately at 2 $\\mu_c$ in the temperature range 20-50 MeV, which can indirectly help to locate the point on QCD phase diagram at large chemical potential and low temperature zone.

Kakade, Uttam

2015-01-01T23:59:59.000Z

252

Potential of geothermal energy in China  

E-Print Network [OSTI]

This thesis provides an overview of geothermal power generation and the potential for geothermal energy utilization in China. Geothermal energy is thermal energy stored in the earth's crust and currently the only ubiquitously ...

Sung, Peter On

2010-01-01T23:59:59.000Z

253

Tiny Glass Bubbles With Big Potential  

Broader source: Energy.gov [DOE]

If these glass microspheres' walls could talkThey would explain how their tiny pores allow the potential for handling, storing and transporting a variety of materials, including drugs that have...

254

Siderite, oxidation, and neutralization potential determination  

E-Print Network [OSTI]

Due to the nature of native soils overlying lignite seams in Texas, mixed overburden is allowed as a topsoil substitute. Determination of suitable topsoil replacements is based on chemical analysis, including neutralization potential (NP), a...

Porter, Elizabeth Brooke

2001-01-01T23:59:59.000Z

255

Missing solution in a Cornell potential  

SciTech Connect (OSTI)

Missing bound-state solutions for fermions in the background of a Cornell potential consisting of a mixed scalarvectorpseudoscalar coupling is examined. Charge-conjugation operation, degeneracy and localization are discussed. -- Highlights: The Dirac equation with scalarvectorpseudoscalar Cornell potential is investigated. The isolated solution from the SturmLiouville problem is found. Charge-conjugation operation, degeneracy and localization are discussed.

Castro, L.B., E-mail: luis.castro@pgfsc.ufsc.br [Departamento de Fsica, CFM, Universidade Federal de Santa Catarina, 88040-900, Florianpolis - SC (Brazil); Castro, A.S. de, E-mail: castro@pq.cnpq.br [Departamento de Fsica e Qumica, Campus de Guaratinguet, Universidade Estadual Paulista, 12516-410, Guaratinguet - SP (Brazil)] [Departamento de Fsica e Qumica, Campus de Guaratinguet, Universidade Estadual Paulista, 12516-410, Guaratinguet - SP (Brazil)

2013-11-15T23:59:59.000Z

256

On the Chemical Potential of Dark Energy  

E-Print Network [OSTI]

It is widely assumed that the observed universe is accelerating due to the existence of a new fluid component called dark energy. In this article, the thermodynamics consequences of a nonzero chemical potential on the dark energy component is discussed with special emphasis to the phantom fluid case. It is found that if the dark energy fluid is endowed with a negative chemical potential, the phantom field hypothesis becomes thermodynamically consistent with no need of negative temperatures as recently assumed in the literature.

S. H. Pereira

2008-06-23T23:59:59.000Z

257

Molecular electrostatic potentials by systematic molecular fragmentation  

SciTech Connect (OSTI)

A simple method is presented for estimating the molecular electrostatic potential in and around molecules using systematic molecular fragmentation. This approach estimates the potential directly from the electron density. The accuracy of the method is established for a set of organic molecules and ions. The utility of the approach is demonstrated by estimating the binding energy of a water molecule in an internal cavity in the protein ubiquitin.

Reid, David M.; Collins, Michael A. [Research School of Chemistry, Australian National University, Canberra, ACT 0200 (Australia)] [Research School of Chemistry, Australian National University, Canberra, ACT 0200 (Australia)

2013-11-14T23:59:59.000Z

258

Optical Properties and Potential Applications of Doped Semiconductor...  

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

Optical Properties and Potential Applications of Doped Semiconductor Nanoparticles. Optical Properties and Potential Applications of Doped Semiconductor Nanoparticles. Abstract:...

259

Optimization of multi-pressure himidification-dehumidification desalination using thermal vapor compression and hybridization  

E-Print Network [OSTI]

Humidification-dehumidification (HD or HDH) desalination, and specifically HD driven by a thermal vapor compressor (TVC), is a thermal desalination method that has the potential to produce potable water efficiently in order ...

Mistry, Karan Hemant

260

Reduction potentials of vesicle-bound viologens  

SciTech Connect (OSTI)

Thermodynamic reduction potentials have been determined by using spectroelectrochemical and cyclic voltammetric methods for a homologous series of amphiphilic ciologens (N-methyl-N{prime}-alkyl-4,4{prime}-bipyridinium ions, C{sub n}MV{sup 2+}) in a variety of media, including dihexadecyl phosphate (DHP), dioctadecylimethylammonium, and phosphatidylcholine small unilamellar vesicles. In general, potentials for both one-electron steps, i.e., C{sub n}MV{sup 2+} + e{sup {minus}} {yields} C{sub n}MV{sup +} and C{sub n}MV{sup +} + e{sup {minus}} {yields} C{sub n}MV{sup 0}, were insensitive to the alkyl chain length, which was varied over the range n = 6{minus}20. The single exception was a large decrease ({approximately}100 mV) in the first reduction potential for DHP-bound viologens when the chain length was increased from n = 10 to n = 12; this effect was attributed to a change in binding topography. The magnitudes of the reduction potentials were highly dependent upon the vesicle charge; the pattern observed indicated that interfacial electrostatic interactions between the surfactant headgroups and bipyridinium rings were the dominant factors determining the potentials. As discussed in the text, the data allow resolution of several heretofore puzzling observations concerning viologen reactivities in microphase suspensions.

Yabin Lei; Hurst, J.K. (Oregon Graduate Inst. of Science and Technology, Beaverton (United States))

1991-10-03T23:59:59.000Z

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


261

Potential inversion with subbarrier fusion data revisited  

E-Print Network [OSTI]

We invert experimental data for heavy-ion fusion reactions at energies well below the Coulomb barrier in order to directly determine the internucleus potential between the colliding nuclei. In contrast to the previous applications of the inversion formula, we explicitly take into account the effect of channel couplings on fusion reactions, by assuming that fusion cross sections at deep subbarrier energies are governed by the lowest barrier in the barrier distribution. We apply this procedure to the $^{16}$O +$^{144}$Sm and $^{16}$O +$^{208}$Pb reactions, and find that the inverted internucleus potential are much thicker than phenomenological potentials. A relation to the steep fall-off phenomenon of fusion cross sections recently found at deep subbarrier energies is also discussed.

K. Hagino; Y. Watanabe

2007-06-18T23:59:59.000Z

262

Potential Condensed Fuel for the Milky Way  

E-Print Network [OSTI]

Potential condensed clouds of gas in the Galactic halo are examined in the context of the recent models of cooling, fragmenting clouds building up the baryonic mass of the Galaxy. 582 high-velocity clouds (HVCs) are defined as the potential infalling, condensed clouds and the sample's spatial and velocity distribution are presented. With the majority of the hydrogen in the clouds ionized (~85%), the clouds at a distribution of distances within 150 kpc, and their individual total masses below 10^7 Msun, the total mass in potentially condensed clouds is 1.1 - 1.4 x 10^9 Msun. If the tighter distance constraint of condensing cloud models, as well as feedback and additional accretion methods, are discussed.

M. E. Putman

2006-03-23T23:59:59.000Z

263

Potential effects of gallium on cladding materials  

SciTech Connect (OSTI)

This paper identifies and examines issues concerning the incorporation of gallium in weapons derived plutonium in light water reactor (LWR) MOX fuels. Particular attention is given to the more likely effects of the gallium on the behavior of the cladding material. The chemistry of weapons grade (WG) MOX, including possible consequences of gallium within plutonium agglomerates, was assessed. Based on the calculated oxidation potentials of MOX fuel, the effect that gallium may have on reactions involving fission products and possible impact on cladding performance were postulated. Gallium transport mechanisms are discussed. With an understanding of oxidation potentials and assumptions of mechanisms for gallium transport, possible effects of gallium on corrosion of cladding were evaluated. Potential and unresolved issues and suggested research and development (R and D) required to provide missing information are presented.

Wilson, D.F.; Beahm, E.C.; Besmann, T.M.; DeVan, J.H.; DiStefano, J.R.; Gat, U.; Greene, S.R.; Rittenhouse, P.L.; Worley, B.A.

1997-10-01T23:59:59.000Z

264

Boson stars: Chemical potential and quark condensates  

E-Print Network [OSTI]

We study the properties of a star made of self-gravitating bosons gas in a mean-field approximation. A generalized set of Tolman-Oppenheimer-Volkov(TOV) equations is derived to incorporate the effect of chemical-potential in the general relativistic frame work. The metric-dependence of the chemical-potential gives a new class of solutions for the boson stars. It is demonstrated that the maximum mass and radius of the star change in a significant way when the effect of finite chemical-potential is considered. We also discuss the case of a boson star made of quark-condensates. It is found that when the self-interaction between the condensates is small as compared to their mass, the typical density is too high to form a diquark-boson star. Our results indicate that the star of quark-condensate may be formed in a low-density and high-pressure regime.

Jitesh R. Bhatt; V. Sreekanth

2010-05-06T23:59:59.000Z

265

Analytic Models of Plausible Gravitational Lens Potentials  

SciTech Connect (OSTI)

Gravitational lenses on galaxy scales are plausibly modeled as having ellipsoidal symmetry and a universal dark matter density profile, with a Sersic profile to describe the distribution of baryonic matter. Predicting all lensing effects requires knowledge of the total lens potential: in this work we give analytic forms for that of the above hybrid model. Emphasizing that complex lens potentials can be constructed from simpler components in linear combination, we provide a recipe for attaining elliptical symmetry in either projected mass or lens potential.We also provide analytic formulae for the lens potentials of Sersic profiles for integer and half-integer index. We then present formulae describing the gravitational lensing effects due to smoothly-truncated universal density profiles in cold dark matter model. For our isolated haloes the density profile falls off as radius to the minus fifth or seventh power beyond the tidal radius, functional forms that allow all orders of lens potential derivatives to be calculated analytically, while ensuring a non-divergent total mass. We show how the observables predicted by this profile differ from that of the original infinite-mass NFW profile. Expressions for the gravitational flexion are highlighted. We show how decreasing the tidal radius allows stripped haloes to be modeled, providing a framework for a fuller investigation of dark matter substructure in galaxies and clusters. Finally we remark on the need for finite mass halo profiles when doing cosmological ray-tracing simulations, and the need for readily-calculable higher order derivatives of the lens potential when studying catastrophes in strong lenses.

Baltz, Edward A.; Marshall, Phil; Oguri, Masamune

2007-05-04T23:59:59.000Z

266

Analytic models of plausible gravitational lens potentials  

SciTech Connect (OSTI)

Gravitational lenses on galaxy scales are plausibly modelled as having ellipsoidal symmetry and a universal dark matter density profile, with a Sersic profile to describe the distribution of baryonic matter. Predicting all lensing effects requires knowledge of the total lens potential: in this work we give analytic forms for that of the above hybrid model. Emphasising that complex lens potentials can be constructed from simpler components in linear combination, we provide a recipe for attaining elliptical symmetry in either projected mass or lens potential. We also provide analytic formulae for the lens potentials of Sersic profiles for integer and half-integer index. We then present formulae describing the gravitational lensing effects due to smoothly-truncated universal density profiles in cold dark matter model. For our isolated haloes the density profile falls off as radius to the minus fifth or seventh power beyond the tidal radius, functional forms that allow all orders of lens potential derivatives to be calculated analytically, while ensuring a non-divergent total mass. We show how the observables predicted by this profile differ from that of the original infinite-mass NFW profile. Expressions for the gravitational flexion are highlighted. We show how decreasing the tidal radius allows stripped haloes to be modelled, providing a framework for a fuller investigation of dark matter substructure in galaxies and clusters. Finally we remark on the need for finite mass halo profiles when doing cosmological ray-tracing simulations, and the need for readily-calculable higher order derivatives of the lens potential when studying catastrophes in strong lenses.

Baltz, Edward A.; Marshall, Phil; Oguri, Masamune, E-mail: eabaltz@slac.stanford.edu, E-mail: pjm@physics.ucsb.edu, E-mail: oguri@slac.stanford.edu [Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, PO Box 20450, MS29, Stanford, CA 94309 (United States)] [Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, PO Box 20450, MS29, Stanford, CA 94309 (United States)

2009-01-15T23:59:59.000Z

267

Potential energy surfaces for cluster emitting nuclei  

SciTech Connect (OSTI)

Potential energy surfaces are calculated by use of the most advanced asymmetric two-center shell model that allows us to obtain shell-and-pairing corrections that are added to the Yukawa-plus-exponential model deformation energy. Shell effects are of crucial importance for the experimental observation of spontaneous disintegration by heavy-ion emission. Results for {sup 222}Ra, {sup 232}U, {sup 236}Pu, and {sup 242}Cm illustrate the main ideas and show for the first time, for a cluster emitter, a potential barrier obtained by use of the macroscopic-microscopic method.

Poenaru, Dorin N.; Gherghescu, Radu A. [Horia Hulubei National Institute of Physics and Nuclear Engineering, RO-077125 Bucharest-Magurele (Romania); Frankfurt Institute for Advanced Studies, J. W. Goethe Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt (Germany); Greiner, Walter [Frankfurt Institute for Advanced Studies, J. W. Goethe Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt (Germany)

2006-01-15T23:59:59.000Z

268

Designer Gravity and Field Theory Effective Potentials  

SciTech Connect (OSTI)

Motivated by the anti-de Sitter conformal field theory correspondence, we show that there is remarkable agreement between static supergravity solutions and extrema of a field theory potential. For essentially any function V({alpha}) there are boundary conditions in anti--de Sitter space so that gravitational solitons exist precisely at the extrema of V and have masses given by the value of V at these extrema. Based on this, we propose new positive energy conjectures. On the field theory side, each function V can be interpreted as the effective potential for a certain operator in the dual field theory.

Hertog, Thomas; Horowitz, Gary T. [Department of Physics, UCSB, Santa Barbara, California 93106 (United States)

2005-06-10T23:59:59.000Z

269

Quantum Electric Field Fluctuations and Potential Scattering  

E-Print Network [OSTI]

Some physical effects of time averaged quantum electric field fluctuations are discussed. The one loop radiative correction to potential scattering are approximately derived from simple arguments which invoke vacuum electric field fluctuations. For both above barrier scattering and quantum tunneling, this effect increases the transmission probability. It is argued that the shape of the potential determines a sampling function for the time averaging of the quantum electric field operator. We also suggest that there is a nonperturbative enhancement of the transmission probability which can be inferred from the probability distribution for time averaged electric field fluctuations.

Huang, Haiyun

2015-01-01T23:59:59.000Z

270

Nurturing creative potential in kindergarten children  

E-Print Network [OSTI]

Subject: Psychology NURTURING CREATIVE POTENTIAL IN KINDERGARTEN CHILDREN A Thesis 'ulILLIAFl ROBERT OXLEY Approved as to style and content by: hai. man of ommxttee ! ea of epartment l'lember g, P em er Flay 1971 ABSTRACT Iturtur ing Creative... Potential in Kindergarten Children. (I'lay lo71) 11illiam Robert Oxley, B. S. , Texas ALII University; M. Div. , Church Divinity School of Pacific; S. T. M. , University of the South; Directed by: Dr. M. R. Smith Creativity, defined as the process...

Oxley, William Robert

1971-01-01T23:59:59.000Z

271

Economic Energy Savings Potential in Federal Buildings  

SciTech Connect (OSTI)

The primary objective of this study was to estimate the current life-cycle cost-effective (i.e., economic) energy savings potential in Federal buildings and the corresponding capital investment required to achieve these savings, with Federal financing. Estimates were developed for major categories of energy efficiency measures such as building envelope, heating system, cooling system, and lighting. The analysis was based on conditions (building stock and characteristics, retrofit technologies, interest rates, energy prices, etc.) existing in the late 1990s. The potential impact of changes to any of these factors in the future was not considered.

Brown, Daryl R.; Dirks, James A.; Hunt, Diane M.

2000-09-04T23:59:59.000Z

272

Center for Diesel Research Potential Efficiency Improvement  

E-Print Network [OSTI]

Speed Histogram #12;Center for Diesel Research Results ­ Power Data Wasted power · Engine Hydraulic FanW Fan Power Histogram Fan Power Scatter Plot #12;Center for Diesel Research Results ­ Average AccessoryCenter for Diesel Research Potential Efficiency Improvement by Accessory Load Reduction on Hybrid

Minnesota, University of

273

Your Engineering Future: Discovering Your Potential  

E-Print Network [OSTI]

in the nation. Some of the specialized services offered include: · Two engineering career fairs each year · JobYour Engineering Future: Discovering Your Potential INVESTING WISELY The University of Texas the entire university, the Cockrell School offers engineering students a personalized place to begin

Lightsey, Glenn

274

Spatial resolution in vector potential photoelectron microscopy  

SciTech Connect (OSTI)

The experimental spatial resolution of vector potential photoelectron microscopy is found to be much higher than expected because of the cancellation of one of the expected contributions to the point spread function. We present a new calculation of the spatial resolution with support from finite element ray tracing, and experimental results.

Browning, R. [R. Browning Consultants, 1 Barnhart Place, Shoreham, New York 11786 (United States)] [R. Browning Consultants, 1 Barnhart Place, Shoreham, New York 11786 (United States)

2014-03-15T23:59:59.000Z

275

The Hyperfine Einstein-Infeld-Hoffmann Potential  

E-Print Network [OSTI]

We use recently developed effective field theory techniques to calculate the third order post-Newtonian correction to the spin-spin potential between two spinning objects. This correction represents the first contribution to the spin-spin interaction due to the non-linear nature of general relativity and will play an important role in forthcoming gravity wave experiments.

Rafael A. Porto; Ira Z. Rothstein

2006-04-21T23:59:59.000Z

276

Hydropower Potential Studies Reviewed for Scoping Study  

E-Print Network [OSTI]

Feasibility Study on Five Potential Hydroelectric Power Generation Locations, North Unit Irrigation District B/ENERGY STORAGE PROJECTS C1 Assessment of Opportunities for New US Pumped Storage Hydroelectric Plants Using Hydroelectric Pumped Storage for Enabling Variable Energy Resources within the FCRPS C4 Technical Analysis

277

CHAPTER NO. FULLY NONLINEAR POTENTIAL FLOW MODELS  

E-Print Network [OSTI]

approaches pursued were based on using : (i) linear or nonlinear Shallow Water Wave equations (Carrier approaches. Griffiths et al. 28 1992, compared measurements of internal kinematics of periodic waves shoalingCHAPTER NO. FULLY NONLINEAR POTENTIAL FLOW MODELS USED FOR LONG WAVE RUNUP PREDICTION (S. Grilli

Grilli, Stéphan T.

278

Motion Planning with Gamma-Harmonic Potential  

E-Print Network [OSTI]

University of Petroleum and Minerals This paper extends the capabilities of the harmonic potential field (HPF into geometrical subregions where each region has an attribute of its own. The suggested approach uses a task) regions and to converge to the goal are provided. The capabilities of the planner are demonstrated using

Masoud, Ahmad A.

279

LABORATORY II ELECTRIC FIELDS AND ELECTRIC POTENTIALS  

E-Print Network [OSTI]

Lab II - 1 LABORATORY II ELECTRIC FIELDS AND ELECTRIC POTENTIALS In this lab you will continue to investigate the abstract concept of electric field. If you know the electric field at a point in space, you). With this simulation you can construct a complicated charge configuration and read out the resulting electric field

Minnesota, University of

280

INVERSION OF REFLECTIVITY DATA FOR NONDECAYING POTENTIALS  

E-Print Network [OSTI]

ray reflectometry, thin film structure, material prop erties of thin films, phase identification, surfaces University Ames, IA 50011 Abstract: The recovery of material properties of thin films is consideredline and asymptotic to a positive constant. The reconstruction of such a potential is studied in terms

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


281

CALIFORNIA ENERGY Small HVAC Problems and Potential  

E-Print Network [OSTI]

CALIFORNIA ENERGY COMMISSION Small HVAC Problems and Potential Savings Reports Summary of Problems of the Integrated Design of Small Commercial HVAC Systems research project. The reports are a result of funding: Productivity and Interior Environments Integrated Design of Large Commercial HVAC Systems Integrated Design

282

Potential of innovative ceramics for turbine  

E-Print Network [OSTI]

Potential of innovative ceramics for turbine applications. A. Jankowiak, R. Valle, M. Parlier ODAS ceramics for turbine applications. Potentiel de céramiques innovantes pour des applications turbines par A. Jankowiak, R. Valle, M. Parlier Résumé traduit : L'amélioration du rendement thermique des turbines à gaz d

283

RESEARCH REPORT Test-Potentiated Learning  

E-Print Network [OSTI]

RESEARCH REPORT Test-Potentiated Learning: Distinguishing Between Direct and Indirect Effects of Tests Kathleen M. Arnold and Kathleen B. McDermott Washington University in St. Louis The facilitative effect of retrieval practice, or testing, on the probability of later retrieval has been the focus

McDermott, Kathleen

284

Growing Sandalwood in Nepal--Potential  

E-Print Network [OSTI]

Growing Sandalwood in Nepal--Potential Silvicultural Methods and Research Priorities1 Peter E. Neil 2 Abstract: Interest in sandalwood has increased recently in Nepal as a result of a royal directive establishment of sandalwood in Nepal. The silvicultural methods discussed could well be of use to other

Standiford, Richard B.

285

Carbon Capture and Storage Realising the potential?  

E-Print Network [OSTI]

and Storage Realising the potential? Jim Watson (editor), Florian Kern and Matt Gross Sussex Energy Group for Energy Policy and Technology, Imperial College London Stuart Haszeldine, Francisco Ascui, Hannah Chalmers for the whole for the UK research community ­ www.ukerc.ac.uk/support/TheMeetingPlace National Energy Research

Haszeldine, Stuart

286

Potential applications of high temperature helium  

SciTech Connect (OSTI)

This paper discusses the DOE MHTGR-SC program`s recent activity to improve the economics of the MHTGR without sacrificing safety performance and two potential applications of high temperature helium, the MHTGR gas turbine plant and a process heat application for methanol production from coal.

Schleicher, R.W. Jr.; Kennedy, A.J.

1992-09-01T23:59:59.000Z

287

Potential applications of high temperature helium  

SciTech Connect (OSTI)

This paper discusses the DOE MHTGR-SC program's recent activity to improve the economics of the MHTGR without sacrificing safety performance and two potential applications of high temperature helium, the MHTGR gas turbine plant and a process heat application for methanol production from coal.

Schleicher, R.W. Jr.; Kennedy, A.J.

1992-09-01T23:59:59.000Z

288

Physics 321 Energy Conservation Potential Energy in  

E-Print Network [OSTI]

of Energy I A sphere rolls without slipping down an incline. Given m, R, and , find the velocity. Identify of Energy III (a) A sphere rolls without slipping down an incline. Given m, R, and , find x(t). 1) WritePhysics 321 Hour 7 Energy Conservation ­ Potential Energy in One Dimension WorkEnergy Theorem

Hart, Gus

289

Potential for seasonal power oversupply in 2013  

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

202013 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N Potential for seasonal power oversupply in 2013 BPA has estimated the amount of wind generation that could be...

290

An eddy closure for potential vorticity  

SciTech Connect (OSTI)

The Gent-McWilliams (GM) parameterization is extended to include a direct influence in the momentum equation. The extension is carried out in two stages; an analysis of the inviscid system is followed by an analysis of the viscous system. In the inviscid analysis the momentum equation is modified such that potential vorticity is conserved along particle trajectories following a transport velocity that includes the Bolus velocity in a manner exactly analogous to the continuity and tracer equations. In addition (and in contrast to traditional GM closures), the new formulation of the inviscid momentum equation results in a conservative exchange between potential and kinetic forms of energy. The inviscid form of the eddy closure conserves total energy to within an error proportional to the time derivative of the Bolus velocity. The hypothesis that the viscous term in the momentum equation should give rise to potential vorticity being diffused along isopycnals in a manner analogous to other tracers is examined in detail. While the form of the momentum closure that follows from a strict adherence to this hypothesis is not immediately interpretable within the constructs of traditional momentum closures, three approximations to this hypothesis results in a form of dissipation that is consistent with traditional Laplacian diffusion. The first two approximations are that relative vorticity, not potential vorticity, is diffused along isopyncals and that the flow is in approximate geostrophic balance. An additional approximation to the Jacobian term is required when the dissipation coefficient varies in space. More importantly, the critique of this hypothesis results in the conclusion that the viscosity parameter in the momentum equation should be identical to the tradition GM closure parameter {Kappa}. Overall, we deem the viscous form of the eddy closure for potential vorticity as a viable closure for use in ocean circulation models.

Ringler, Todd D [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

291

Potential Carriers andPotential Carriers and Approaches for HydrogenApproaches for Hydrogen  

E-Print Network [OSTI]

Refueling Type On-Board Storage Type Compressed Gaseous Hydrogen · Pipeline · Low-P Tube Trailer · HighPotential Carriers andPotential Carriers and Approaches for HydrogenApproaches for Hydrogen © 2007 TIAX LLC Hydrogen Delivery Analysis Meeting May 8-9, 2007 Columbia, Maryland Matthew Hooks Stefan

292

Potential for Biofuel-based Greenhouse Gas Emission Mitigation: Rationale and Potential  

E-Print Network [OSTI]

1 Potential for Biofuel-based Greenhouse Gas Emission Mitigation: Rationale and Potential By Bruce biofuel usage. Biofuel feedstocks are a source of raw material that can be transformed into petroleum for coal. In the USA, liquid fuel biofuel production has not proven to be broadly economically feasible

McCarl, Bruce A.

293

Chemical potential and the gap equation  

E-Print Network [OSTI]

In general the kernel of QCD's gap equation possesses a domain of analyticity upon which the equation's solution at nonzero chemical potential is simply obtained from the in-vacuum result through analytic continuation. On this domain the single-quark number- and scalar-density distribution functions are mu-independent. This is illustrated via two models for the gap equation's kernel. The models are alike in concentrating support in the infrared. They differ in the form of the vertex but qualitatively the results are largely insensitive to the Ansatz. In vacuum both models realise chiral symmetry in the Nambu-Goldstone mode and in the chiral limit, with increasing chemical potential, exhibit a first-order chiral symmetry restoring transition at mu~M(0), where M(p^2) is the dressed-quark mass function. There is evidence to suggest that any associated deconfinement transition is coincident and also of first-order.

Huan Chen; Wei Yuan; Lei Chang; Yu-Xin Liu; Thomas Klahn; Craig D. Roberts

2008-07-17T23:59:59.000Z

294

Semimetalic graphene in a modulated electric potential  

E-Print Network [OSTI]

The $\\pi$-electronic structure of graphene in the presence of a modulated electric potential is investigated by the tight-binding model. The low-energy electronic properties are strongly affected by the period and field strength. Such a field could modify the energy dispersions, destroy state degeneracy, and induce band-edge states. It should be noted that a modulated electric potential could make semiconducting graphene semimetallic, and that the onset period of such a transition relies on the field strength. There exist infinite Fermi-momentum states in sharply contrast with two crossing points (Dirac points) for graphene without external fields. The finite density of states (DOS) at the Fermi level means that there are free carriers, and, at the same time, the low DOS spectrum exhibits many prominent peaks, mainly owing to the band-edge states.

J. H. Ho; Y. H. Chiu; S. J. Tsai; M. F. Lin

2008-09-09T23:59:59.000Z

295

A Potential Window to the GUT  

E-Print Network [OSTI]

The possibility that the form of the inflationary potential can be reconstructed from a knowledge of the primordial power spectra of scalar (density) and tensor (gravity wave) perturbations is discussed and reviewed. It is suggested that measurements of the scalar spectral index and the amplitude of the tensor spectrum at one scale should be possible in the near future. This would be sufficient to determine whether the potential is convex or concave over the limited region relevant to the formation of large-scale structure in the universe. Such information would provide an `observation' of physics at energy scales above $10^{14}$GeV. $^*$Invited talk presented at {\\em The Second Alexander Friedmann International Seminar on Gravitation and Cosmology, St. Petersburg, Russia, 12th-19th September 1993.}

James E. Lidsey

1994-04-27T23:59:59.000Z

296

BAYESIAN ESTIMATION OF FUEL ECONOMY POTENTIAL  

E-Print Network [OSTI]

BAYESIAN ESTIMATION OF FUEL ECONOMY POTENTIAL DUE TO TECHNOLOGY IMPROVEMENTS by Richard W. Andrews in the engineering assessment phase of this project: N.T. Barnes, B. Beeson, R.C. Belaire, W.C. Follmer, R.J. Genik, R.C. Heathfield, T.E. Kenney, D.L. Kulp, J.G. LaFond, J.D. Medrick, N.M. Novelli, G. Pietron, N

Berger, Jim

297

Techniques for remotely sensing watershed runoff potential  

E-Print Network [OSTI]

Techniques for Remotely Sensing Watershed Runoff Potential. (August 1978) Jerry Don Walker, B. S. , Texas ASM University Directed by: Dr. Bruce J. Blanchard The Soil Conservation Service runoff equation is widely used for predicting the watershed runoff... cases, no outflow occurs through the spillway of an overdes1gned structure. Since evaporation losses are high 1n these areas, the salinity of the water stored in the structure gradually increases with time. With insufficient flow through...

Walker, Jerry Don

1978-01-01T23:59:59.000Z

298

Sandia National Laboratories: considered potential environmental effects  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1development Sandia, NREL Releasehy-drogen poweracquisitionscienceconsidered potential

299

Property:PotentialCSPArea | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformation Max JumpPotentialBiopowerSolidMass Jump to: navigation,

300

Property:PotentialCSPCapacity | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformation Max JumpPotentialBiopowerSolidMass Jump to:

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


301

Property:PotentialCSPGeneration | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformation Max JumpPotentialBiopowerSolidMass Jump

302

Mapping the Frontier of New Wind Power Potential | Department...  

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

Mapping the Frontier of New Wind Power Potential Mapping the Frontier of New Wind Power Potential February 18, 2015 - 11:40am Addthis This map shows wind potential capacity for...

303

Polymer escape from a confining potential  

E-Print Network [OSTI]

The rate of escape of polymers from a two-dimensionally confining potential well has been evaluated using self-avoiding as well as ideal chain representations of varying length, up to 80 beads. Long timescale Langevin trajectories were calculated using the path integral hyperdynamics method to evaluate the escape rate. A minimum is found in the rate for self-avoiding polymers of intermediate length while the escape rate decreases monotonically with polymer length for ideal polymers. The increase in the rate for long, self-avoiding polymers is ascribed to crowding in the potential well which reduces the free energy escape barrier. An effective potential curve obtained using the centroid as an independent variable was evaluated by thermodynamic averaging and Kramers rate theory then applied to estimate the escape rate. While the qualitative features are well reproduced by this approach, it significantly overestimates the rate, especially for the longer polymers. The reason for this is illustrated by constructing a two-dimensional effective energy surface using the radius of gyration as well as the centroid as controlled variables. This shows that the description of a transition state dividing surface using only the centroid fails to confine the system to the region corresponding to the free energy barrier and this problem becomes more pronounced the longer the polymer is. A proper definition of a transition state for polymer escape needs to take into account the shape as well as the location of the polymer.

Harri Mkknen; Timo Ikonen; Tapio Ala-Nissila; Hannes Jnsson

2015-03-26T23:59:59.000Z

304

Nonlinear Lattice Waves in Random Potentials  

E-Print Network [OSTI]

Localization of waves by disorder is a fundamental physical problem encompassing a diverse spectrum of theoretical, experimental and numerical studies in the context of metal-insulator transition, quantum Hall effect, light propagation in photonic crystals, and dynamics of ultra-cold atoms in optical arrays. Large intensity light can induce nonlinear response, ultracold atomic gases can be tuned into an interacting regime, which leads again to nonlinear wave equations on a mean field level. The interplay between disorder and nonlinearity, their localizing and delocalizing effects is currently an intriguing and challenging issue in the field. We will discuss recent advances in the dynamics of nonlinear lattice waves in random potentials. In the absence of nonlinear terms in the wave equations, Anderson localization is leading to a halt of wave packet spreading. Nonlinearity couples localized eigenstates and, potentially, enables spreading and destruction of Anderson localization due to nonintegrability, chaos and decoherence. The spreading process is characterized by universal subdiffusive laws due to nonlinear diffusion. We review extensive computational studies for one- and two-dimensional systems with tunable nonlinearity power. We also briefly discuss extensions to other cases where the linear wave equation features localization: Aubry-Andre localization with quasiperiodic potentials, Wannier-Stark localization with dc fields, and dynamical localization in momentum space with kicked rotors.

Sergej Flach

2014-09-10T23:59:59.000Z

305

Potential Impacts of Hydrokinetic and Wave Energy Conversion...  

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

Potential Impacts of Hydrokinetic and Wave Energy Conversion Technologies on Aquatic Environments Potential Impacts of Hydrokinetic and Wave Energy Conversion Technologies on...

306

agonists potential utility: Topics by E-print Network  

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

will present possibilities for development and deployment of solar energy. We will use Kosovo to compare the existing power production potential and future possible potential by...

307

apoptosis inducing potential: Topics by E-print Network  

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

will present possibilities for development and deployment of solar energy. We will use Kosovo to compare the existing power production potential and future possible potential by...

308

Design Potential of Metal Foil Substrates for Optimized DOC Performanc...  

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

Design Potential of Metal Foil Substrates for Optimized DOC Performance Design Potential of Metal Foil Substrates for Optimized DOC Performance Poster presentation at the 2007...

309

Energy Department Report Finds Major Potential to Increase Clean...  

Energy Savers [EERE]

Department Report Finds Major Potential to Increase Clean Hydroelectric Power Energy Department Report Finds Major Potential to Increase Clean Hydroelectric Power April 17, 2012 -...

310

Inner-Helmholtz Potential Development at the Hematite (alpha...  

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

used to predict inner-Helmholtz potentials of hematite electrodes. Citation: Boily JF, SME Chatman, and KM Rosso.2011."Inner-Helmholtz Potential Development at the Hematite...

311

Potential Oil Production from the Coastal Plain of the Arctic...  

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

Potential Oil Production from the Coastal Plain of the Arctic National Wildlife Refuge: Updated Assessment Executive Summary This Service Report, Potential Oil Production from the...

312

Combined Heat and Power Market Potential for Opportunity Fuels...  

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

Combined Heat and Power Market Potential for Opportunity Fuels, August 2004 Combined Heat and Power Market Potential for Opportunity Fuels, August 2004 The purpose of this 2004...

313

Meeting Concerning Potential Test Procedures and Energy Conservation...  

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

Concerning Potential Test Procedures and Energy Conservation Standards for Set-Top Boxes and Network Equipment Meeting Concerning Potential Test Procedures and Energy Conservation...

314

age potential role: Topics by E-print Network  

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

old, 12-month old, and adult) based on auditory event-related potentials Reilly, James P. 7 Differential Gene Expression between Sensory Neocortical Areas: Potential Roles...

315

Working Fluids Low Global Warming Potential Refrigerants - 2013...  

Energy Savers [EERE]

Working Fluids Low Global Warming Potential Refrigerants - 2013 Peer Review Working Fluids Low Global Warming Potential Refrigerants - 2013 Peer Review Emerging Technologies...

316

Thermodynamic Evaluation of Low-Global Warming Potential Refrigerants...  

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

Evaluation of Low-Global-Warming-Potential Refrigerants Research & Development Roadmap: Next-Generation Low Global Warming Potential Refrigerants Next Generation Low-Global...

317

Midstream Infrastructure Improvements Key to Realizing Full Potential...  

Office of Environmental Management (EM)

Midstream Infrastructure Improvements Key to Realizing Full Potential of Domestic Natural Gas Midstream Infrastructure Improvements Key to Realizing Full Potential of Domestic...

318

Stable Free Radicals and Potential Implications for Health Effects...  

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

Stable Free Radicals and Potential Implications for Health Effects of Diesel Emissions Stable Free Radicals and Potential Implications for Health Effects of Diesel Emissions 2005...

319

Direct Experimental Observation of the Low Ionization Potentials...  

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

Observation of the Low Ionization Potentials of Guanine in Free Oligonucleotides by Using Photoelectron Direct Experimental Observation of the Low Ionization Potentials of Guanine...

320

All-Boron Aromatic Clusters as Potential New Inorganic Ligands...  

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

Boron Aromatic Clusters as Potential New Inorganic Ligands and Building Blocks in Chemistry. All-Boron Aromatic Clusters as Potential New Inorganic Ligands and Building Blocks in...

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


321

Countries Commit to White Roofs, Potentially Offsetting the Emissions...  

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

Countries Commit to White Roofs, Potentially Offsetting the Emissions of Over 300 Power Plants Countries Commit to White Roofs, Potentially Offsetting the Emissions of Over 300...

322

Isospectral partners for a complex PT-invariant potential  

E-Print Network [OSTI]

We construct isospectral partner potentials of a complex PT-invariant potential, viz., V(x) = V_1 sech ^2 x - i V_2 sech x tanh x using Darboux's method. Oneset of isospectral potentials are obatined which can be termed 'Satellite potentials', in the sense that they are pf the same form as the original potential. In a particular case, the supersymmetric partner potential has the same spectrum, including the zero energy ground state, a fact which cannot occur in conventional supersymmetric quantum mechanics with real potential. An explicit example of a non-trivial set of isospectral potential is also obtained.

Anjana Sinha; Rajkumar Roychoudhury

2002-05-20T23:59:59.000Z

323

Potential Effect of Pollutantn Emissions on Global Warming: First...  

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

Potential Effect of Pollutantn Emissions on Global Warming: First Comparisong Using External Costs on Urban Buses Potential Effect of Pollutantn Emissions on Global Warming: First...

324

Thermodynamic Evaluation of Low-Global-Warming-Potential Refrigerants...  

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

Thermodynamic Evaluation of Low-Global-Warming-Potential Refrigerants Thermodynamic Evaluation of Low-Global-Warming-Potential Refrigerants Lead Performer: National Institute of...

325

Africa - Technical Potential of Solar Energy to Address Energy...  

Open Energy Info (EERE)

Africa - Technical Potential of Solar Energy to Address Energy Poverty and Avoid GHG Emissions Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Technical Potential of...

326

The Potential Benefits of Distributed Generation and the Rate...  

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

The Potential Benefits of Distributed Generation and the Rate-Related Issues That May Impede Its Expansion The Potential Benefits of Distributed Generation and the Rate-Related...

327

Profitable Biodiesel Potential from Increased Agricultural Yields Country Name  

E-Print Network [OSTI]

Profitable Biodiesel Potential from Increased Agricultural Yields Country Name Production Cost ($/liter) Potential Biodiesel Volume (liters) Total Export Profits ($) HDI Rank GDP/ cap Corrupt Rank FDI

Wisconsin at Madison, University of

328

Mechanisms controlling soil carbon turnover and their potential...  

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

controlling soil carbon turnover and their potential application for enhancing carbon sequestration . Mechanisms controlling soil carbon turnover and their potential application...

329

Carbon Emissions Reduction Potential in the US Chemicals and...  

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

Carbon Emissions Reduction Potential in the US Chemicals and Pulp and Paper Industries by Applying CHP Technologies, June 1999 Carbon Emissions Reduction Potential in the US...

330

Mexico - Greenhouse Gas Emissions Baselines and Reduction Potentials...  

Open Energy Info (EERE)

Baselines and Reduction Potentials from Buildings Jump to: navigation, search Name Mexico - Greenhouse Gas Emissions Baselines and Reduction Potentials from Buildings Agency...

331

FUEL CYCLE POTENTIAL WASTE FOR DISPOSITION  

SciTech Connect (OSTI)

The United States (U.S.) currently utilizes a once-through fuel cycle where used nuclear fuel (UNF) is stored on-site in either wet pools or in dry storage systems with ultimate disposal in a deep mined geologic repository envisioned. Within the Department of Energy's (DOE) Office of Nuclear Energy (DOE-NE), the Fuel Cycle Research and Development Program (FCR&D) develops options to the current commercial fuel cycle management strategy to enable the safe, secure, economic, and sustainable expansion of nuclear energy while minimizing proliferation risks by conducting research and development of advanced fuel cycles, including modified open and closed cycles. The safe management and disposition of used nuclear fuel and/or nuclear waste is a fundamental aspect of any nuclear fuel cycle. Yet, the routine disposal of used nuclear fuel and radioactive waste remains problematic. Advanced fuel cycles will generate different quantities and forms of waste than the current LWR fleet. This study analyzes the quantities and characteristics of potential waste forms including differing waste matrices, as a function of a variety of potential fuel cycle alternatives including: (1) Commercial UNF generated by uranium fuel light water reactors (LWR). Four once through fuel cycles analyzed in this study differ by varying the assumed expansion/contraction of nuclear power in the U.S; (2) Four alternative LWR used fuel recycling processes analyzed differ in the reprocessing method (aqueous vs. electro-chemical), complexity (Pu only or full transuranic (TRU) recovery) and waste forms generated; (3) Used Mixed Oxide (MOX) fuel derived from the recovered Pu utilizing a single reactor pass; and (4) Potential waste forms generated by the reprocessing of fuels derived from recovered TRU utilizing multiple reactor passes.

Jones, R.; Carter, J.

2010-10-13T23:59:59.000Z

332

FUEL CYCLE POTENTIAL WASTE FOR DISPOSITION  

SciTech Connect (OSTI)

The United States (U.S.) currently utilizes a once-through fuel cycle where used nuclear fuel (UNF) is stored on-site in either wet pools or in dry storage systems with ultimate disposal in a deep mined geologic repository envisioned. Within the Department of Energy's (DOE) Office of Nuclear Energy (DOE-NE), the Fuel Cycle Research and Development Program (FCR&D) develops options to the current commercial fuel cycle management strategy to enable the safe, secure, economic, and sustainable expansion of nuclear energy while minimizing proliferation risks by conducting research and development of advanced fuel cycles, including modified open and closed cycles. The safe management and disposition of used nuclear fuel and/or nuclear waste is a fundamental aspect of any nuclear fuel cycle. Yet, the routine disposal of used nuclear fuel and radioactive waste remains problematic. Advanced fuel cycles will generate different quantities and forms of waste than the current LWR fleet. This study analyzes the quantities and characteristics of potential waste forms including differing waste matrices, as a function of a variety of potential fuel cycle alternatives including: (1) Commercial UNF generated by uranium fuel light water reactors (LWR). Four once through fuel cycles analyzed in this study differ by varying the assumed expansion/contraction of nuclear power in the U.S. (2) Four alternative LWR used fuel recycling processes analyzed differ in the reprocessing method (aqueous vs. electro-chemical), complexity (Pu only or full transuranic (TRU) recovery) and waste forms generated. (3) Used Mixed Oxide (MOX) fuel derived from the recovered Pu utilizing a single reactor pass. (4) Potential waste forms generated by the reprocessing of fuels derived from recovered TRU utilizing multiple reactor passes.

Carter, J.

2011-01-03T23:59:59.000Z

333

Theoretical studies of potential energy surfaces  

SciTech Connect (OSTI)

The goal of this program is to calculate accurate potential energy surfaces (PES) for both reactive and nonreactive systems. To do this the electronic Schrodinger equation must be solved. Our approach to this problem starts with multiconfiguration self-consistent field (MCSCF) reference wavefunctions. These reference wavefunctions are designed to be sufficiently flexible to accurately describe changes in electronic structure over a broad range of geometries. Electron correlation effects are included via multireference, singles and doubles configuration interaction (MRSDCI) calculations. With this approach, the authors are able to provide useful predictions of the energetics for a broad range of systems.

Harding, L.B. [Argonne National Laboratory, IL (United States)

1993-12-01T23:59:59.000Z

334

FERC sees huge potential for demand response  

SciTech Connect (OSTI)

The FERC study concludes that U.S. peak demand can be reduced by as much as 188 GW -- roughly 20 percent -- under the most aggressive scenario. More moderate -- and realistic -- scenarios produce smaller but still significant reductions in peak demand. The FERC report is quick to point out that these are estimates of the potential, not projections of what could actually be achieved. The main varieties of demand response programs include interruptible tariffs, direct load control (DLC), and a number of pricing schemes.

NONE

2010-04-15T23:59:59.000Z

335

Potential applications of microscopy for steam coal  

SciTech Connect (OSTI)

Optical microscopy has been an extremely useful tool for many industrial sectors in the past. This paper introduces some of the potential applications of using coal and fly ash carbon microscopy for the combustion process and steam coal industry. Coal and fly ash carbon microscopic classification criteria are described. Plant sample data are presented which demonstrate that these techniques can be useful for coal selection and for problem solving in the coal-fired power plant environment. Practical recommendations for further study are proposed.

DeVanney, K.F.; Clarkson, R.J.

1995-08-01T23:59:59.000Z

336

Spinor One-forms as Gravitational Potentials  

E-Print Network [OSTI]

General relativity is derived from an action which is quadratic in the covariant derivative of certain spinor one-form gravitational potentials. Either a pair of 2-component spinor one-forms or a single Dirac spinor one-form can be employed. The metric is a quadratic function of these spinor one-forms. In the 2-component spinor formulation the action differs from the usual chiral action for general relativity by a total differential. In the Dirac spinor formulation the action is the real part of the former one. The Hamiltonian is related to the ones in positive energy proofs and spinorial quasilocal mass constructions.

Roh Suan Tung; Ted Jacobson

1995-02-23T23:59:59.000Z

337

The fuel conservation potential of Texas vanpools  

E-Print Network [OSTI]

of transportation, but the concept is still celativelv new to most people. A vanpool is best described as a group of 8 co 12 employees with geographically cluscered residences who share che expense of owning and operating a van in which they commute to work (1... conservation potential of vanpooling. Please answer all of the questions to the best of your ability; then return the questionnaire to your company's vanpool program administrator. Company's Name Locati. on 1. How far is your daily roundtrip commute...

Williamson, Dennis Vernon

1979-01-01T23:59:59.000Z

338

Potential underground risks associated with CAES.  

SciTech Connect (OSTI)

CAES in geologic media has been proposed to help 'firm' renewable energy sources (wind and solar) by providing a means to store energy when excess energy was available, and to provide an energy source during non-productive renewable energy time periods. Such a storage media may experience hourly (perhaps small) pressure swings. Salt caverns represent the only proven underground storage used for CAES, but not in a mode where renewable energy sources are supported. Reservoirs, both depleted natural gas and aquifers represent other potential underground storage vessels for CAES, however, neither has yet to be demonstrated as a functional/operational storage media for CAES.

Kirk, Matthew F.; Webb, Stephen Walter; Broome, Scott Thomas; Pfeifle, Thomas W.; Grubelich, Mark Charles; Bauer, Stephen J.

2010-10-01T23:59:59.000Z

339

Quantum potential energy as concealed motion  

E-Print Network [OSTI]

It is known that the Schroedinger equation may be derived from a hydrodynamic model in which the Lagrangian position coordinates of a continuum of particles represent the quantum state. Using Routh\\s method of ignorable coordinates it is shown that the quantum potential energy of particle interaction that represents quantum effects in this model may be regarded as the kinetic energy of additional concealed freedoms. The method brings an alternative perspective to Planck\\s constant, which plays the role of a hidden variable, and to the canonical quantization procedure, since what is termed kinetic energy in quantum mechanics may be regarded literally as energy due to motion.

Peter Holland

2014-11-13T23:59:59.000Z

340

Oil history, potential converge in Azerbaijan  

SciTech Connect (OSTI)

Azerbaijan, the oldest known oil producing region in the world, still holds great potential for new discoveries and increased production. A multi-billion dollar production sharing agreement was recently signed with a consortium of primarily western oil companies to develop three oil fields in the Caspian Sea. Soon, Azerbaijan will offer new exploration acreage both offshore and onshore. This paper describes the history of oil production in Azerbaijan, offshore developments, tectonics, stratigraphy, petroleum traps, mud volcanoes, and short summaries of several oil producing areas. Current production is about 9 million tons/yr of oil and 7 billion cu m/yr of natural gas.

Narimanov, A.A. [State Oil Co. of Azerbaijan, Baku (Azerbaijan); Palaz, I. [Amoco Production Co., Houston, TX (United States)

1995-05-22T23:59:59.000Z

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


341

Research highlights potential for improved solar cells  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassive Solar HomePromisingStories »Submitter A B C D E F G H I JDefenseandPotential

342

Sandia National Laboratories: quantify potential ocular impacts  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1developmentturbine bladelifetimepower-to-gasproduce andPublications 2013potential

343

Effect of propane-air on NGVs and vehicle fueling stations. Topical report, January 1-October 1, 1993  

SciTech Connect (OSTI)

Propane-air (P/A) peakshaving is an important element of peak-load management for some U.S. gas utilities. P/A is used as a supplemental energy medium with natural gas and has been shown to operate satisfactorily in most natural gas applications. The propane levels injected are compatible with the pressures (under 200 psig) and temperatures (over 40 F) found in utility distribution networks. However, P/A can create problems for natural gas vehicles (NGVs) operating on compressed gas as well as NGV fueling stations. This report contains information on P/A peakshaving and its compatibility with NGVs by documenting condensation impacts at nine conditions--i.e., three propane levels and three temperatures. These data portray the depressurization of a vehicle tank, an area selected because it illustrates NGV operation and can discriminate between acceptable and potentially non-acceptable operating points. These analyses show, not surprisingly, a correlation exists between propane level, ambient temperature, and condensation.

Liss, W.E.; Moulton, D.S.

1994-06-01T23:59:59.000Z

344

U.S. Energy Information Administration (EIA)  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

oil recovery NGTDM Natural Gas Transmission and Distribution Module CSAPR Cross-State Air Pollution Rule NGV Natural gas vehicle CSAPR Cross-State Air Pollution Rule NHTSA...

345

Neutrino factories: realization and physics potential  

SciTech Connect (OSTI)

Neutrino Factories offer an exciting option for the long-term neutrino physics program. This new type of neutrino facility will provide beams with unique properties. Low systematic uncertainties at a Neutrino Factory, together with a unique and precisely known neutrino flavor content, will enable neutrino oscillation measurements to be made with unprecedented sensitivity and precision. Over recent years, the resulting neutrino factory physics potential has been discussed extensively in the literature. In addition, over the last six years the R&D necessary to realize a Neutrino Factory has been progressing, and has developed into a significant international activity. It is expected that, within about five more years, the initial phase of this R&D program will be complete and, if the community chooses to build this new type of neutrino source within the following decade, neutrino factory technology will be ready for the final R&D phase prior to construction. In this paper (1) an overview is given of the technical ingredients needed for a Neutrino Factory, (2) beam properties are described, (3) the resulting neutrino oscillation physics potential is summarized, (4) a more detailed description is given for one representative Neutrino Factory design, and (5) the ongoing R&D program is summarized, and future plans briefly described.

Geer, S.; /Fermilab; Zisman, M.S.; /LBL, Berkeley

2006-12-01T23:59:59.000Z

346

Potential Refrigerants for Power Electronics Cooling  

SciTech Connect (OSTI)

In the past, automotive refrigerants have conventionally been used solely for the purpose of air conditioning. However, with the development of hybrid-electric vehicles and the incorporation of power electronics (PEs) into the automobile, automotive refrigerants are taking on a new role. Unfortunately, PEs have lifetimes and functionalities that are highly dependent on temperature and as a result thermal control plays an important role in the performance of PEs. Typically, PEs are placed in the engine compartment where the internal combustion engine (ICE) already produces substantial heat. Along with the ICE heat, the additional thermal energy produced by PEs themselves forces designers to use different cooling methods to prevent overheating. Generally, heat sinks and separate cooling loops are used to maintain the temperature. Disturbingly, the thermal control system can consume one third of the total volume and may weigh more than the PEs [1]. Hence, other avenues have been sought to cool PEs, including submerging PEs in automobile refrigerants to take advantage of two-phase cooling. The objective of this report is to explore the different automotive refrigerants presently available that could be used for PE cooling. Evaluation of the refrigerants will be done by comparing environmental effects and some thermo-physical properties important to two-phase cooling, specifically measuring the dielectric strengths of potential candidates. Results of this report will be used to assess the different candidates with good potential for future use in PE cooling.

Starke, M.R.

2005-10-24T23:59:59.000Z

347

Geothermal: Sponsored by OSTI -- The Potential Impacts on Aquatic...  

Office of Scientific and Technical Information (OSTI)

The Potential Impacts on Aquatic Ecosystems from the Release of Trace Elements in Geothermal Fluids...

348

Organic Fruits and Vegetables: Potential Health Benefits and Risks  

E-Print Network [OSTI]

conventional crops. Safeguards against the potential microbiological danger of manure have included composting

Chen, Michael C

2005-01-01T23:59:59.000Z

349

Potential Land Use Implications of a Global Biofuels Industry  

E-Print Network [OSTI]

In this paper we investigate the potential production and implications of a global biofuels industry. We

Gurgel, Angelo C.

350

ANALYSIS OF CHP POTENTIAL AT FEDERAL SITES  

SciTech Connect (OSTI)

This document was prepared at the request of the U.S. Department of Energy's (DOE's) Federal Energy Management Program (FEMP) under its Technical Guidance and Assistance and Project Financing Programs. The purpose was to provide an estimate of the national potential for combined heat and power (also known as CHP; cogeneration; or cooling, heating, and power) applications at federal facilities and the associated costs and benefits including energy and emission savings. The report provides a broad overview for the U.S. Department of Energy (DOE) and other agencies on when and where CHP systems are most likely to serve the government's best interest. FEMP's mission is to reduce the cost to and environmental impact of the federal government by advancing energy efficiency and water conservation, promoting the use of renewable energy, and improving utility management decisions at federal sites. FEMP programs are driven by its customers: federal agency sites. FEMP monitors energy efficiency and renewable energy technology developments and mounts ''technology-specific'' programs to make technologies that are in strong demand by agencies more accessible. FEMP's role is often one of helping the federal government ''lead by example'' through the use of advanced energy efficiency/renewable energy (EERE) technologies in its own buildings and facilities. CHP was highlighted in the Bush Administration's National Energy Policy Report as a commercially available technology offering extraordinary benefits in terms of energy efficiencies and emission reductions. FEMP's criteria for emphasizing a technology are that it must be commercially available; be proven but underutilized; have a strong constituency and momentum; offer large energy savings and other benefits of interest to federal sites and FEMP mission; be in demand; and carry sufficient federal market potential. As discussed in the report, CHP meets all of these criteria. Executive Order 13123 directs federal facilities to use CHP when life-cycle costs indicate energy reduction goals will be met. FEMP can assist facilities to conduct this analysis. The model developed for this report estimates the magnitude of CHP that could be implemented under various performance and economic assumptions associated with different applications. This model may be useful for other energy technologies. It can be adapted to estimate the market potential in federal buildings for any energy system based on the cost and performance parameters that a user desires to assess. The model already incorporates a standard set of parameters based on available data for federal buildings including total building space, building type, energy use intensity, fuel costs, and the performance of many prime movers commonly used in CHP applications. These and other variables can be adjusted to meet user needs or updated in the future as new data become available.

HADLEY, S.W.

2002-03-11T23:59:59.000Z

351

TO EVALUATE BATH-TUB POTENTIAL SUMMARY  

E-Print Network [OSTI]

This report discusses additional field testing that is considered necessary to confirm the permeabilities of the bedrock at the Estes Gulch Disposal site. The proposed field efforts also provide for follow-up monitoring during and immediately following construction. This will ensure that the effects of remaining uncertainties regarding foundation permeabilities and other geohydrologic factors will not violate the integrity of the Disposal Cell or can be remedied during the latter stages of construction to preclude potential problems. Furthermore, the results obtained by the proposed testing and monitoring may allow us to relax the stringency of the radon cover permeability requirement and achieve lower cost in constructing the radon barrier. concepts and field program presented here supplement the information-presented in the recently completed report: "Evaluation of Surficial Soil-and Rock

Estes Gulch. Disposal Cell; Morrison Knudsen Corporation

1992-01-01T23:59:59.000Z

352

Neutron sources: Present practice and future potential  

SciTech Connect (OSTI)

The present capability and future potential of accelerator-based monoenergetic and white neutron sources are outlined in the context of fundamental and applied neutron-nuclear research. The neutron energy range extends from thermal to 500 MeV, and the time domain from steady-state to pico-second pulsed sources. Accelerator technology is summarized, including the production of intense light-ion, heavy-ion and electron beams. Target capabilities are discussed with attention to neutron-producing efficiency and power-handling capabilities. The status of underlying neutron-producing reactions is summarized. The present and future use of neutron sources in: fundamental neutron-nuclear research, nuclear data acquisition, materials damage studies, engineering tests, and biomedical applications are discussed. Emphasis is given to current status, near-term advances well within current technology, and to long-range projections. 90 refs., 4 figs.

Cierjacks, S.; Smith, A.B.

1988-01-01T23:59:59.000Z

353

Self-potential observations during hydraulic fracturing  

SciTech Connect (OSTI)

The self-potential (SP) response during hydraulic fracturing of intact Sierra granite was investigated in the laboratory. Excellent correlation of pressure drop and SP suggests that the SP response is created primarily by electrokinetic coupling. For low pressures, the variation of SP with pressure drop is linear, indicating a constant coupling coefficient (Cc) of -200 mV/MPa. However for pressure drops >2 MPa, the magnitude of the Cc increases by 80% in an exponential trend. This increasing Cc is related to increasing permeability at high pore pressures caused by dilatancy of micro-cracks, and is explained by a decrease in the hydraulic tortuosity. Resistivity measurements reveal a decrease of 2% prior to hydraulic fracturing and a decrease of {approx}35% after fracturing. An asymmetric spatial SP response created by injectate diffusion into dilatant zones is observed prior to hydraulic fracturing, and in most cases this SP variation revealed the impending crack geometry seconds before failure. At rupture, injectate rushes into the new fracture area where the zeta potential is different than in the rock porosity, and an anomalous SP spike is observed. After fracturing, the spatial SP distribution reveals the direction of fracture propagation. Finally, during tensile cracking in a point load device with no water flow, a SP spike is observed that is caused by contact electrification. However, the time constant of this event is much less than that for transients observed during hydraulic fracturing, suggesting that SP created solely from material fracture does not contribute to the SP response during hydraulic fracturing.

Moore, Jeffrey R.; Glaser, Steven D.

2007-09-13T23:59:59.000Z

354

Interior cavern conditions and salt fall potential  

SciTech Connect (OSTI)

A relatively large number of salt caverns are used for fluid hydrocarbon storage, including an extensive set of facilities in the Gulf Coast salt domes for the Strategic Petroleum Reserve (SPR) Program. Attention is focused on the SPR caverns because of available histories that detail events involving loss and damage of the hanging string casing. The total number of events is limited, making the database statistically sparse. The occurrence of the events is not evenly distributed, with some facilities, and some caverns, more susceptible than others. While not all of these events could be attributed to impacts from salt falls, many did show the evidence of such impacts. As a result, a study has been completed to analyze the potential for salt falls in the SPR storage caverns. In this process, it was also possible to deduce some of the cavern interior conditions. Storage caverns are very large systems in which many factors could possibly play a part in casing damage. In this study, all of the potentially important factors such as salt dome geology, operational details, and material characteristics were considered, with all being logically evaluated and most being determined as secondary in nature. As a result of the study, it appears that a principal factor in determining a propensity for casing damage from salt falls is the creep and fracture characteristics of salt in individual caverns. In addition the fracture depends strongly upon the concentration of impurity particles in the salt. Although direct observation of cavern conditions is not possible, the average impurity concentration and the accumulation of salt fall material can be determined. When this is done, there is a reasonable correlation between the propensity for a cavern to show casing damage events and accumulation of salt fall material. The accumulation volumes of salt fall material can be extremely large, indicating that only a few of the salt falls are large enough to cause impact damage.

Munson, D.E.; Molecke, M.A. [Sandia National Labs., Albuquerque, NM (United States); Myers, R.E. [Strategic Petroleum Reserve, New Orleans, LA (United States)

1998-03-01T23:59:59.000Z

355

A map for eccentric orbits in triaxial potentials  

E-Print Network [OSTI]

We construct a simple symplectic map to study the dynamics of eccentric orbits in non-spherical potentials. The map offers a dramatic improvement in speed over traditional integration methods, while accurately representing the qualitative details of the dynamics. We focus attention on planar, non-axisymmetric power-law potentials, in particular the logarithmic potential. We confirm the presence of resonant orbit families (``boxlets'') in this potential and uncover new dynamics such as the emergence of a stochastic web in nearly axisymmetric logarithmic potentials. The map can also be applied to triaxial, lopsided, non-power-law and rotating potentials.

J. Touma; S. Tremaine

1997-06-04T23:59:59.000Z

356

Current-potential characteristics of electrochemical systems  

SciTech Connect (OSTI)

This dissertation contains investigations in three distinct areas. Chapters 1 and 2 provide an analysis of the effects of electromagnetic phenomena during the initial stages of cell discharge. Chapter 1 includes the solution to Maxwell`s equations for the penetration of the axial component of an electric field into an infinitely long cylindrical conductor. Chapter 2 contains the analysis of the conductor included in a radial circuit. Chapter 3 provides a complete description of the equations that describe the growth of an oxide film. A finite difference program was written to solve the equations. The system investigated is the iron/iron oxide in a basic, aqueous solution. Chapters 4 and 5 include the experimental attempts for replacing formaldehyde with an innocuous reducing agent for electroless deposition. In chapter 4, current-versus-voltage curves are provided for a sodium thiosulfate bath in the presence of a copper disk electrode. Also provided are the cathodic polarization curves of a copper/EDTA bath in the presence of a copper electrode. Chapter 5 contains the experimental results of work done with sodium hypophosphite as a reducing agent. Mixed-potential-versus-time curves for solutions containing various combinations of copper sulfate, nickel chloride, and hypophosphite in the presence of a palladium disk electrode provide an indication of the reducing power of the solutions.

Battaglia, V.S.

1993-07-01T23:59:59.000Z

357

Potential hydrologic characterization wells in Amargosa Valley  

SciTech Connect (OSTI)

More than 500 domestic, agricultural, and monitoring wells were identified in the Amargosa Valley. From this list, 80 wells were identified as potential hydrologic characterization wells, in support of the US Department of Energy (DOE) Underground Test Area/Remedial Investigation and Feasibility Study (UGTA/RIFS). Previous hydrogeologic studies have shown that groundwater flow in the basin is complex and that aquifers may have little lateral continuity. Wells located more than 10 km or so from the Nevada Test Site (NTS) boundary may yield data that are difficult to correlate to sources from the NTS. Also, monitoring well locations should be chosen within the guidelines of a hydrologic conceptual model and monitoring plan. Since these do not exist at this time, recompletion recommendations will be restricted to wells relatively close (approximately 20 km) to the NTS boundary. Recompletion recommendations were made for two abandoned agricultural irrigation wells near the town of Amargosa Valley (previously Lathrop Wells), for two abandoned wildcat oil wells about 10 km southwest of Amargosa Valley, and for Test Well 5 (TW-5), about 10 km east of Amargosa Valley.

Lyles, B.; Mihevc, T.

1994-09-01T23:59:59.000Z

358

POTENTIAL THERMOELECTRIC APPLICATIONS IN DIESEL VEHICLES  

SciTech Connect (OSTI)

Novel thermodynamic cycles developed by BSST provide improvements by factors of approximately 2 in cooling, heating and power generation efficiency of solid-state thermoelectric systems. The currently available BSST technology is being evaluated in automotive development programs for important new applications. Thermoelectric materials are likely to become available that further increase performance by a comparable factor. These major advancements should allow the use of thermoelectric systems in new applications that have the prospect of contributing to emissions reduction, fuel economy, and improved user comfort. Potential applications of thermoelectrics in diesel vehicles are identified and discussed. As a case in point, the history and status of the Climate Controlled Seat (CCS) system from Amerigon, the parent of BSST, is presented. CCS is the most successful and highest production volume thermoelectric system in vehicles today. As a second example, the results of recent analyses on electric power generation from vehicle waste heat are discussed. Conclusions are drawn as to the practicality of waste power generation systems that incorporate BSST's thermodynamic cycle and advanced thermoelectric materials.

Crane, D

2003-08-24T23:59:59.000Z

359

Potential of Securitization in Solar PV Finance  

SciTech Connect (OSTI)

This report aims to demonstrate, hypothetically and at a high level, what volumes of solar deployment could be supported given solar industry access to the capital markets in the form of security issuance. Securitization is not anticipated to replace tax equity in the near- to mid-term, but it could provide an additional source of funds that would be comparatively inexpensive and could reduce the weighted average cost of capital for a given solar project or portfolio. Thus, the potential to securitize solar assets and seek financing in the capital markets could help to sustain the solar industry when the investment tax credit (ITC) -- one of the federal incentives that has leveraged billions of dollars of private capital in the solar industry -- drops from 30% to 10% at the close of 2016. The report offers analysis on the size of the U.S. third-party financed solar market, as well as on the volumes (in MW) of solar asset origination possible through a $100 million securitization fund (assuming no overcollateralization). It also provides data on the size of the relevant securities markets and how the solar asset class may fit into these markets.

Lowder, T.; Mendelsohn, M.

2013-12-01T23:59:59.000Z

360

Potentiality and Contradiction in Quantum Mechanics  

E-Print Network [OSTI]

Following J.-Y.B\\'eziau in his pioneer work on non-standard interpretations of the traditional square of opposition, we have applied the abstract structure of the square to study the relation of opposition between states in superposition in orthodox quantum mechanics in \\cite{are14}. Our conclusion was that such states are \\ita{contraries} (\\ita{i.e.} both can be false, but both cannot be true), contradicting previous analyzes that have led to different results, such as those claiming that those states represent \\ita{contradictory} properties (\\ita{i. e.} they must have opposite truth values). In this chapter we bring the issue once again into the center of the stage, but now discussing the metaphysical presuppositions which underlie each kind of analysis and which lead to each kind of result, discussing in particular the idea that superpositions represent potential contradictions. We shall argue that the analysis according to which states in superposition are contrary rather than contradictory is still more plausible.

Jonas R. B. Arenhart; Dcio Krause

2014-06-07T23:59:59.000Z

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While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
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361

Potential Operating Orbits for the SAFE-400  

SciTech Connect (OSTI)

Safety must be ensured during all phases of space fission system design, development, fabrication, launch, operation, and shutdown. One potential space fission system application is fission electric propulsion (FEP), in which fission energy is converted into electricity and used to power high efficiency (Isp > 3000 s) electric thrusters. For these types of systems it is important to determine which operational scenarios ensure safety while allowing maximum mission performance and flexibility. Space fission systems are essentially non-radioactive at launch, prior to extended operation at high power. Once high power operation begins, system radiological inventory steadily increases as fission products build up. For a given fission product isotope, the maximum radiological inventory is typically achieved once the system has operated for a length of time equivalent to several half-lives. After that time, the isotope decays at the same rate it is produced, and no further inventory builds in. For an FEP mission beginning in Earth orbit, altitude and orbital lifetime increase as the propulsion system operates. Two simultaneous effects of fission propulsion system operation are thus (1) increasing fission product inventory and (2) increasing orbital lifetime. Phrased differently, as fission products build up, more time is required for the fission products to naturally convert back into non-radioactive isotopes. Simultaneously, as fission products build up, orbital lifetime increases, providing more time for the fission products to naturally convert back into nonradioactive isotopes. Operational constraints required to ensure safety can thus be quantified. (authors)

Houts, Mike; Kos, Larry; Poston, David [NASA MSFC, TD40, Marshall Space Flight Center, Alabama, 35812 (United States)

2002-07-01T23:59:59.000Z

362

Energy conservation in Kenya: progress, potentials, problems  

SciTech Connect (OSTI)

A study was carried out of the flows of commercial energy in the economy of Kenya. Indications were sought of the extent to which energy conservation, (i.e., increase in efficiency of energy use) has reduced the ratio of energy inputs to economic outputs, in the post-1973 years. An assessment was made of the potential for energy conservation to reduce the growth of Kenyan energy use in the future and of significant barriers to increasing energy efficiency. Consideration was given to the role of government policy and of international assistance in fostering energy conservation in Kenya and other developing countries. The study was performed by analyzing available energy data and statistics from the largest oil companies, the Kenyan electric utility, and the government. These sources were supplemented by conducting personal interviews with personnel of nearly 50 commercial firms in Kenya. Direct consumption of fuel accounts for 94% of the commercial energy use in Kenya, while electricity accounts for 6%. The sectoral division of fuel use is: transportation 53%, industry 21%, energy production 11%, agriculture 9%, buildings and residences 5%, and construction 1%. For electricity the division is: buildings and residences 48%, industry 45%, energy production 4%, agriculture 2%, and construction 1%. Recent progress in conservation is reported.

Schipper, L.; Hollander, J.M.; Milukas, M.; Alcamo, J.; Meyers, S.; Noll, S.

1981-09-01T23:59:59.000Z

363

Potential for the Use of Energy Savings Performance Contracts...  

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

Potential for the Use of Energy Savings Performance Contracts to Reduce Energy Consumption and Provide Energy and Cost Savings in Non-Building Applications Potential for the Use of...

364

analysis yields potential: Topics by E-print Network  

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

the a3 R u and 13 R g states of Li2 has yielded accurate analytic potential energy functions for both states. The recommended M3LR8:0 5;33? potential for the a3...

365

Scattering amplitudes for multi-indexed extensions of solvable potentials  

SciTech Connect (OSTI)

New solvable one-dimensional quantum mechanical scattering problems are presented. They are obtained from known solvable potentials by multiple Darboux transformations in terms of virtual and pseudo virtual wavefunctions. The same method applied to confining potentials, e.g. PschlTeller and the radial oscillator potentials, has generated the multi-indexed Jacobi and Laguerre polynomials. Simple multi-indexed formulas are derived for the transmission and reflection amplitudes of several solvable potentials. -- Highlights: Scattering amplitudes calculated for infinitely many new solvable potentials. New scattering potentials obtained by deforming six known solvable potentials. Multiple Darboux transformations in terms of (pseudo) virtual states employed. Scattering amplitudes checked to obey the shape invariance relation. Errors in scattering amplitudes of some undeformed potentials in the literature corrected.

Ho, C.-L. [Department of Physics, Tamkang University, Tamsui 251, Taiwan, ROC (China); Lee, J.-C., E-mail: jcclee@cc.nctu.edu.tw [Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan, ROC (China); Sasaki, R. [Center for Theoretical Sciences, National Taiwan University, Taipei, Taiwan, ROC (China); Department of Physics, Shinshu University, Matsumoto 390-8621 (Japan)

2014-04-15T23:59:59.000Z

366

"CENTRU" REGION Natural and Antropic Potential Development Perspectives  

E-Print Network [OSTI]

fauna, flora, geologic, and geomorphic variety 43 % of the Romanian protected areas can be found"CENTRU" REGION Natural and Antropic Potential Development Perspectives REGIUNEA CENTRU Potential natural si antropic- Perspective de dezvoltare SIMION CRETU Agentia pentru Dezvoltare Regionala CENTRU

Paris-Sud XI, Universit de

367

Modeling and inversion of self-potential data  

E-Print Network [OSTI]

This dissertation presents data processing techniques relevant to the acquisition, modeling, and inversion of self-potential data. The primary goal is to facilitate the interpretation of self-potentials in terms of the ...

Minsley, Burke J

2007-01-01T23:59:59.000Z

368

Infrared absorption spectra, radiative efficiencies, and global warming potentials  

E-Print Network [OSTI]

Infrared absorption spectra, radiative efficiencies, and global warming potentials absorption spectra, radiative efficiencies, and global warming potentials of perfluorocarbons: Comparison. (1995) and combined with atmospheric lifetimes from the literature to determine global warming

Wirosoetisno, Djoko

369

Global Potential of Energy Efficiency Standards and Labeling Programs  

E-Print Network [OSTI]

report estimates the global potential reductions in greenhouse gas emissions by 2030 for energy efficiencyreport estimates the global potential reductions in greenhouse gas emissions by 2030 for energy efficiency

McNeil, Michael A

2008-01-01T23:59:59.000Z

370

The mouse visually evoked potential : neural correlates and functional applications  

E-Print Network [OSTI]

The visually evoked potential (VEP) is a local field potential (LFP) evoked in visual cortex in response to visual stimuli. Unlike extracellular single unit recordings, which allow us to probe the function of single spiking ...

Muhammad, Rahmat

2009-01-01T23:59:59.000Z

371

assessing potential dietary: Topics by E-print Network  

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

largest contributors to the supply chain carbon footprint Masanet, Eric 2010-01-01 14 Assessing the Potential of Ride-Sharing Using Mobile and Social Data Assessing the Potential...

372

Potential Flow Calculations of Axisymmetric Ducted Wind Turbines  

E-Print Network [OSTI]

An incompressible potential-flow vortex method has been constructed to analyze the flow field of a ducted

Widnall, Sheila

2009-09-02T23:59:59.000Z

373

Tachyonic potential in Bianchi type-I universe  

E-Print Network [OSTI]

Motivated from recent string theoretic results, a tachyonic potential is constructed for a spatially homogeneous and anisotropic background cosmology.

P. K. Suresh

2003-10-06T23:59:59.000Z

374

assessing potential health: Topics by E-print Network  

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

Technical Report Energy Efficiency Potential Study. Technical Report Energy Efficiency Renewable Energy Technologies Transportation Assessment of Household Carbon Footprint...

375

World Biofuels Assessment; Worldwide Biomass Potential: Technology Characterizations (Milestone Report)  

SciTech Connect (OSTI)

Milestone report prepared by NREL to estimate the worldwide potential to produce and transport ethanol and other biofuels.

Bain, R. L.

2007-12-01T23:59:59.000Z

376

Renewable Energy Potential for Brownfield Redevelopment Strategies (Poster)  

SciTech Connect (OSTI)

This poster, submitted for the Brownfields 2006 conference, discusses the renewable energy potential for brownfield redevelopment strategies.

Mosey, G.

2006-11-01T23:59:59.000Z

377

Refinement of the $n-?$ and $p-?$ fish-bone potential  

E-Print Network [OSTI]

The fishbone potential of composite particles simulates the Pauli effect by nonlocal terms. We determine the $n-\\alpha$ and $p-\\alpha$ fish-bone potential by simultaneously fitting to the experimental phase shifts. We found that with a double Gaussian parametrization of the local potential can describe the $n-\\alpha$ and $p-\\alpha$ phase shifts for all partial waves.

E. Smith; R. Woodhouse; Z. Papp

2012-09-04T23:59:59.000Z

378

Biomass Potentials from California Forest and Shrublands Including Fuel  

E-Print Network [OSTI]

Biomass Potentials from California Forest and Shrublands Including Fuel Reduction Potentials-04-004 February 2005 Revised: October 2005 Arnold Schwarzenegger, Governor, State of California #12;Biomass Tiangco, CEC Bryan M. Jenkins, University of California #12;Biomass Potentials from California Forest

379

Reassessing Wind Potential Estimates for India: Economic and Policy Implications  

E-Print Network [OSTI]

this study, wind energy potential for turbines at 80m, 100m,wind energy potential due to better technology in the form of higher efficiency, hub heights, and sizes of wind turbines.wind energy potential is higher than currently believed. Those aspects are 1) the rapidly improving wind turbine

Phadke, Amol

2012-01-01T23:59:59.000Z

380

A modified LandauDevonshire thermodynamic potential for strontium titanate  

E-Print Network [OSTI]

A modified Landau­Devonshire thermodynamic potential for strontium titanate G. Sheng, Y. L. Li, J Landau­Devonshire thermodynamic potential for strontium titanate G. Sheng,1,a Y. L. Li,2 J. X. Zhang,1,b of the Landau energy coefficients and report a modified thermodynamic potential for bulk strontium titanate

Chen, Long-Qing

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


381

Potential Flow Modelling for Wind Turbines Shane Cline  

E-Print Network [OSTI]

Potential Flow Modelling for Wind Turbines by Shane Cline B.Sc., University of Toledo, 2003 M means, without the permission of the author. #12;ii Potential Flow Modelling for Wind Turbines by Shane potential flow methods are a promising alternative to mainstream wind turbine aerodynamics tools

Victoria, University of

382

Gravitational Potential Variations of the Sun and Moon for Estimation  

E-Print Network [OSTI]

Gravitational Potential Variations of the Sun and Moon for Estimation of Reservoir Compressibility by the moon and the sun. The potential variations are coupled to the reservoir pressure pulsations through for the gravitational potential due to the most impor- tant sources, the moon and the sun, must be obtained. Although

Firoozabadi, Abbas

383

PT symmetry of a conditionally exactly solvable potential  

E-Print Network [OSTI]

A conditionally exactly solvable potential, the supersymmetric partner of the harmonic oscillator is investigated in the PT-symmetric setting. It is shown that a number of properties characterizing shape-invariant and Natanzon-class potentials generated by an imaginary coordinate shift $x-{\\rm i}\\epsilon$ also hold for this potential outside the Natanzon class.

Anjana Sinha; Geza Levai; Pinaki Roy

2004-01-12T23:59:59.000Z

384

Elec 331 -Bio-Potential Electrodes Review Definitions  

E-Print Network [OSTI]

voltages ­ Ohmic (Vr) · Resistance of surface layer · Resistance of electrolyte ­ Concentration (Vc) · Ion V I V I #12;Elec 331 - Bio-Potential Electrodes 5 Equivalent Circuit · Vhc = half-cell potential · Vop = over-potential · CJ = junction capacitance · RJ = junction resistance · RE = electrolyte

Pulfrey, David L.

385

Global warming potentials and radiative efficiencies of halocarbons and related  

E-Print Network [OSTI]

Global warming potentials and radiative efficiencies of halocarbons and related compounds 7A=E472C43AD.A0794E 0794E:CA27C725 AD383CADE64E7 #12;1 Global Warming Potentials and Radiative of REs and global39 warming potentials (GWPs) for these compounds, mostly employing atmospheric lifetimes

Wirosoetisno, Djoko

386

Formal definition of POTENTIAL ENERGY (valid for conservative forces only)  

E-Print Network [OSTI]

page - 16 Formal definition of POTENTIAL ENERGY (valid for conservative forces only) Given one type of conservative force F UB - UA= - = - Definition of 'Potential energy difference" conserv #12;page - 17 the definition of the "potential energy difference UB - UA " as equal to negative value of the work W done

387

The Potential Wind Power Resource in Australia: A New Perspective*  

E-Print Network [OSTI]

The Potential Wind Power Resource in Australia: A New Perspective* Willow Hallgren, Udaya Bhaskar: globalchange@mit.edu Website: http://globalchange.mit.edu/ #12;The Potential Wind Power Resource in Australia density, and analyzes the variation of these characteristics with current and potential wind turbine hub

388

The Potential Wind Power Resource in Australia: A New Perspective  

E-Print Network [OSTI]

The Potential Wind Power Resource in Australia: A New Perspective Willow Hallgren, Udaya Bhaskar;1 The Potential Wind Power Resource in Australia: A New Perspective Willow Hallgren* , Udaya Bhaskar Gunturu intermittency can potentially be mitigated by the aggregation of geographically dispersed wind farms. Our

389

Regional Assessment of Tsunami Potential in the Gulf of Mexico  

E-Print Network [OSTI]

Regional Assessment of Tsunami Potential in the Gulf of Mexico Report to the National Tsunami Hazard Mitigation Program #12;#12;Regional Assessment of Tsunami Potential in the Gulf of Mexico Report should be cited as: Regional Assessment of Tsunami Potential in the Gulf of Mexico: U.S. Geological

ten Brink, Uri S.

390

Potential incorporation of transuranics into uranium phases  

SciTech Connect (OSTI)

The UO{sub 2} in spent nuclear fuel is unstable under moist oxidizing conditions and will be altered to uranyl oxide hydrate phases. The transuranics released during the corrosion of spent fuel may also be incorporated into the structures of secondary U{sup 6+} phases. The incorporation of radionuclides into alteration products will affect their mobility. A series of precipitation tests were conducted at either 150 or 90 C for seven days to determine the potential incorporation of Ce{sup 4+} and Nd{sup 3+} (surrogates for Pu{sup 4+} and Am{sup 3+}, respectively) into uranium phases. Ianthinite ([U{sub 2}{sup 4+}(UO{sub 2}){sub 4}O{sub 6}(OH){sub 4}(H{sub 2}O){sub 4}](H{sub 2}O){sub 5}) was produced by dissolving uranium oxyacetate in a solution containing copper acetate monohydrate as a reductant. The leachant used in these tests were doped with either 2.1 ppm cerium or 399 ppm neodymium. Inductively coupled plasma-mass spectrometer (ICP-MS) analysis of the solid phase reaction products which were dissolved in a HNO{sub 3} solution indicates that about 306 ppm Ce (K{sub d} = 146) was incorporated into ianthinite, while neodymium contents were much higher, being approximately 24,800 ppm (K{sub d} = 62). Solid phase examinations using an analytical transmission electron microscope/electron energy-loss spectrometer (AEM/EELS) indicate a uniform distribution of Nd, while Ce contents were below detection. Becquerelite (Ca[(UO{sub 2}){sub 6}O{sub 4}(OH){sub 6}]{center_dot}8H{sub 2}O) was produced by dissolving uranium oxyacetate in a solution containing calcium acetate. The leachant in these tests was doped with either 2.1 ppm cerium or 277 ppm neodymium. ICP-MS results indicate that about 33 ppm Ce (K{sub d}=16) was incorporated into becquerelite, while neodymium contents were higher, being approximately 1,300 ppm (K{sub d}=5). Homogeneous distribution of Nd in the solid phase was noted during AEM/EELS examination, and Ce contents were also below detection.

Kim, C. W.; Wronkiewicz, D. J.; Buck, E. C.

1999-12-07T23:59:59.000Z

391

Circadian- and light-dependent regulation of resting membrane potential and spontaneous action potential firing of Drosophila circadian pacemaker neurons.  

E-Print Network [OSTI]

oscillations in membrane potential mediated by L-type voltage-voltage- gated channels and that sodium channel activity also contrib- utes to generation of slow-wave oscillations (voltage-gated calcium channels also contribute to spontaneous (and evoked) action potentials and or low-frequency membrane potential oscillations,

Sheeba, Vasu; Gu, Huaiyu; Sharma, Vijay K; O'Dowd, Diane K; Holmes, Todd C

2008-01-01T23:59:59.000Z

392

Assessing the Potential of Ride-Sharing Using Mobile and Social Data Assessing the Potential of Ride-  

E-Print Network [OSTI]

Impact - Pollution - Traffic - High car expenses Assessing the Potential of Ride-Sharing Using Mobile Using Mobile and Social Data Goal: Assess Ride-Sharing Potential o Q: How many cars can be removed ? o Goal: Assess Ride-Sharing Potential o Q: How many cars can be removed ? o Ideal Data: · For all people

Markopoulou, Athina

393

Reassessing Wind Potential Estimates for India: Economic and Policy Implications  

SciTech Connect (OSTI)

We assess developable on-shore wind potential in India at three different hub-heights and under two sensitivity scenarios one with no farmland included, the other with all farmland included. Under the no farmland included case, the total wind potential in India ranges from 748 GW at 80m hub-height to 976 GW at 120m hub-height. Under the all farmland included case, the potential with a minimum capacity factor of 20 percent ranges from 984 GW to 1,549 GW. High quality wind energy sites, at 80m hub-height with a minimum capacity factor of 25 percent, have a potential between 253 GW (no farmland included) and 306 GW (all farmland included). Our estimates are more than 15 times the current official estimate of wind energy potential in India (estimated at 50m hub height) and are about one tenth of the official estimate of the wind energy potential in the US.

Phadke, Amol; Bharvirkar, Ranjit; Khangura, Jagmeet

2011-09-15T23:59:59.000Z

394

An exactly solvable PT symmetric potential from the Natanzon class  

E-Print Network [OSTI]

The ${\\cal PT}$ symmetric version of the generalised Ginocchio potential, a member of the general exactly solvable Natanzon potential class is analysed and its properties are compared with those of ${\\cal PT}$ symmetric potentials from the more restricted shape-invariant class. It is found that the ${\\cal PT}$ symmetric generalised Ginocchio potential has a number of properties in common with the latter potentials: it can be generated by an imaginary coordinate shift $x\\to x+{\\rm i}\\epsilon$; its states are characterised by the quasi-parity quantum number; the spontaneous breakdown of ${\\cal PT}$ symmetry occurs at the same time for all the energy levels; and it has two supersymmetric partners which cease to be ${\\cal PT}$ symmetric when the ${\\cal PT}$ symmetry of the original potential is spontaneously broken.

G. Levai; A. Sinha; P. Roy

2003-06-04T23:59:59.000Z

395

Nucleus-nucleus potential with shell-correction contribution  

E-Print Network [OSTI]

The full relaxed-density potential between spherical nuclei is considered as a sum of the macroscopic and shell-correction contributions. The macroscopic part of the potential is related to a nucleus-nucleus potential obtained in the framework of the extended Thomas-Fermi approach with the Skyrme and Coulomb forces and the relaxed-density ansatz for evaluation of proton and neutron densities of interacting nuclei. A simple prescription for the shell-correction part of the total potential is discussed. The parameters of the shell-correction and macroscopic parts of the relaxed-density potential are found by fitting the empirical barrier heights of the 89 nucleus-nucleus systems as well as macroscopic potentials evaluated for 1485 nucleus-nucleus systems at 12 distances around touching points.

V. Yu. Denisov

2015-02-04T23:59:59.000Z

396

Proceedings of ASME Turbo Expo 2013 June 3-7, 2013, San Antonio, Texas, USA  

E-Print Network [OSTI]

nozzle guide vane. NGV Nozzle guide vane. R Turbine blade. SST Shear stress transport. TKE Turbulence-95843 INFLUENCE OF LEADING EDGE FILLET AND NONAXISYMMETRIC CONTOURED ENDWALL ON TURBINE NGV EXIT FLOW STRUCTURE. The experiments are carried out in the Axial Flow Turbine Research Facility (AFTRF) having a di- ameter of 91.66cm

Camci, Cengiz

397

The effects of two-phase flow on streaming potentials  

E-Print Network [OSTI]

of streaming potentials assessed. Only limited information concerning two- phase flow and streaming potentials is available (Morgan, 1990). Two-phase flow in porous media has been addressed in models of hydraulic flow (Sorey et aL, 1980; Yuan and Slattery... & Stubbs (Wp) and Bretherton (Wn) equations, 53 7. The experimental W values as determined from the experimental sneaming potential enhancement values. 54 8. Core samples for porous media assessment. . . . . 61 9. Cementation exponent, saturation...

Estrada, Cecilia

1993-01-01T23:59:59.000Z

398

Thermodynamics of QCD at large quark chemical potential  

E-Print Network [OSTI]

We review the existing weak-coupling results on the thermodynamic potential of deconfined QCD at small and large quark chemical potential and compare with results from lattice gauge theory as well as the exactly solvable case of large-N_f QCD. We also discuss the new analytical results on non-Fermi-liquid effects in entropy and specific heat as well as in dispersion laws of quark quasiparticles at large quark chemical potential.

Andreas Gerhold; Andreas Ipp; Anton Rebhan

2005-12-21T23:59:59.000Z

399

ORNL/TM-2001/280 Analysis of CHP Potential  

E-Print Network [OSTI]

ORNL/TM-2001/280 Analysis of CHP Potential at Federal Sites February 2002 S. W. Hadley K. L. Kline OF CHP POTENTIAL AT FEDERAL SITES S. W. Hadley K. L. Kline S. E. Livengood J. W. Van Dyke February 2002 for the U.S. DEPARTMENT OF ENERGY under contract no. DE-AC05-00OR22725 #12;Federal CHP Potential #12;Federal

Oak Ridge National Laboratory

400

Geology and Geothermal Potential of the Roosevelt Hot Springs...  

Open Energy Info (EERE)

Utah Jump to: navigation, search OpenEI Reference LibraryAdd to library Thesis: Geology and Geothermal Potential of the Roosevelt Hot Springs Area, Beaver County,...

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


401

Potential of High-Throughput Experimentation with Ammonia Borane...  

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

of High-Throughput Experimentation with Ammonia Borane Solid Hydrogen Storage Materials (presentation) Potential of High-Throughput Experimentation with Ammonia Borane Solid...

402

antitumor potential cicloalcanocarboxilatos: Topics by E-print...  

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

reach of the atmospheric neutrino data collected by a future megaton-class neutrino detector. After a general discussion of the potentialities of atmospheric neutrinos on general...

403

apoptotic potential mediated: Topics by E-print Network  

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

anomaly mediation. In sec. 3 we highlight some of the important features of the ATLAS detector. We explore the potential... which will apply beyond the minimal model. The...

404

argonaute proteins potential: Topics by E-print Network  

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

propagation and cleavage Bartel, David 13 Fractal Analysis of Protein Potential Energy Landscapes Condensed Matter (arXiv) Summary: The fractal properties of the total...

405

U.S. Building-Sector Energy Efficiency Potential  

E-Print Network [OSTI]

New York State Energy Research and Development Authority (of conserved energy values from the CEF and New York stateEnergy Efficiency Resource Development Potential In New York.

Brown, Rich

2008-01-01T23:59:59.000Z

406

FOIASI - Special Inquiry Review of Allegations InvolvingPotentialMisc...  

Office of Environmental Management (EM)

Office of Environmental Management. The allegations involved potential violations of political activity restrictions, lack of impartiality in performing official duties, misuse of...

407

Probing the membrane potential of living cells by dielectric spectroscopy  

E-Print Network [OSTI]

In this paper we demonstrate a quantitative way to measure the membrane potential of live cells by dielectric spectroscopy. We also show that the values of the membrane potential obtained using our technique are in good agreement with those obtained using traditional methods-voltage sensitive dyes. The membrane potential is determined by fitting the experimental dielectric dispersion curves with the dispersion curves obtain from a theoretical model. Variations in the membrane potential were induced by modifying the concentration of potassium chloride in the solution of the cell suspension in the presence of valinomycin. For exemplification of the method, E. coli were chosen for our experiments.

Corina Bot; Camelia Prodan

2008-12-17T23:59:59.000Z

408

ENVIRONMENTAL MONITORING AND ASSESSMENT PROGRAM AT POTENTIAL OTEC SITES  

E-Print Network [OSTI]

Thermal Energy Conversion (OTEC) program preoperational testand biomass distribution at potential OTEC sites.6th OTEC conference, Washington, D.C. Payne, S.F. 1979. The

Wilde, P.

2010-01-01T23:59:59.000Z

409

Optically generated gauge potentials and their effects in cold atoms.  

E-Print Network [OSTI]

??Recent theoretical studies show the possibility of generating optical gauge potentials in neutral atoms using laser beams carrying orbital angular momentum. This is interesting not (more)

Song, Jianjun

2008-01-01T23:59:59.000Z

410

Potential Oil Production from the Coastal Plain of the Arctic...  

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

of Analysis ANWR Coastal Plain Assessment 3. Summary Glossary References Potential Oil Production from the Coastal Plain of the Arctic National Wildlife Refuge: Updated...

411

auditory evoked potentials: Topics by E-print Network  

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

old, 12-month old, and adult) based on auditory event-related potentials Reilly, James P. 3 Real time mapping of rat midbrain neural circuitry using auditory evoked...

412

auditory evoked potential: Topics by E-print Network  

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

old, 12-month old, and adult) based on auditory event-related potentials Reilly, James P. 3 Real time mapping of rat midbrain neural circuitry using auditory evoked...

413

Physics Potential of the gamma=100,100 Beta Beam  

E-Print Network [OSTI]

The physics potential of a Beta Beam fired from CERN to a 440 kton water Cerenkov detector at a distance of 130 Km is computed.

M. Mezzetto

2005-11-02T23:59:59.000Z

414

Electric potential distribution in nanoscale electroosmosis: from molecules to continuum  

E-Print Network [OSTI]

correlations in the electric double layer. 1. Counterionsand correlations in the electric double layer. 2 . SymmetricElectric potential distribution in nanoscale electroosmosis:

Wang, M.; Liu, J.; Chen, S.

2007-01-01T23:59:59.000Z

415

Energy Savings Potential and RD&D Opportunities for Commercial...  

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

documents the energy consumption of commercial refrigeration equipment (CRE) in the U.S. and evaluated the energy savings potential of various technologies and energy efficiency...

416

ARM Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) Product  

SciTech Connect (OSTI)

ARM soundings are used to determine Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) and associated properties, using the following relationships;

Jensen, Michael

2014-04-10T23:59:59.000Z

417

assessing potential exposure: Topics by E-print Network  

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

peroxidation and Pb induced... Elms, Rene' Davina 2013-02-22 6 ASSESSMENT OF HOUSEHOLD CARBON FOOTPRINT REDUCTION POTENTIALS University of California eScholarship Repository...

418

anthracis potential vaccine: Topics by E-print Network  

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

HIV vaccines designed to prevent HIV infection in HIV negative people are called preventive vaccines Levin, Judith G. 9 The Potential Economic Value of a Trypanosoma cruzi...

419

The Potential of Private Institutional Investors for the Financing...  

Open Energy Info (EERE)

of Private Institutional Investors for the Financing of Transport Infrastructure Jump to: navigation, search Tool Summary LAUNCH TOOL Name: The Potential of Private Institutional...

420

The influence of the electrochemical stressing (potential step...  

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

for developing durable electrocatalysts for polymer electrolyte membrane (PEM) fuel cell. The degradation of PtC electrocatalysts under potential static holding...

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


421

ARM Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) Product  

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

ARM soundings are used to determine Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) and associated properties, using the following relationships;

Jensen, Michael

422

Energy Savings Potential and Opportunities for High-Efficiency...  

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

sponsored this assignment and provided comments on draft versions of the report. iii Energy Savings Potential and Opportunities for High-Efficiency Electric Motors in Residential...

423

Clean Energy Policy Analysis: Impact Analysis of Potential Clean...  

Energy Savers [EERE]

Clean Energy Policy Analysis: Impact Analysis of Potential Clean Energy Policy Options for the Hawaii Clean Energy Initiative Clean Energy Policy Analysis: Impact Analysis of...

424

Potential Effect of Pollutantn Emissions on Global Warming: First...  

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

E. JOUBERT & G.PLASSAT, August 2004 Pollutants Emissions Global warming Potential Effect First Comparison using External Costs on Urban Buses Gabriel PLASSAT, ADEME French Agency...

425

Ocean Thermal Energy Conversion: Potential Environmental Impacts and Fisheries  

E-Print Network [OSTI]

Ocean Thermal Energy Conversion: Potential Environmental Impacts and Fisheries Christina M Comfort Institute #12;Ocean Thermal Energy Conversion (OTEC) · Renewable energy ­ ocean thermal gradient · Large

Hawai'i at Manoa, University of

426

action potential propagation: Topics by E-print Network  

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

for action potential propagation in excitable cells CERN Preprints Summary: Speed of propagation of small-amplitude pressure waves through the cytoplasmic interior of...

427

Potential for the Use of Energy Savings Performance Contracts...  

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

The review of potential challenges within this report suggests that, while the same care must be exercised as in every prudent government acquisition, there appear to be no...

428

Vietnam-Status and Potential for the Development of Biofuels...  

Open Energy Info (EERE)

Vietnam-Status and Potential for the Development of Biofuels and Rural Renewable Energy AgencyCompany Organization: Asian Development Bank Sector: Energy Focus Area: Renewable...

429

Fast Generation of Potentials for Self-Assembly of Particles  

E-Print Network [OSTI]

May 12, 2009 ... Fast Generation of Potentials for Self-Assembly of Particles. Philip du Toit(pdutoit ***at*** cds.caltech.edu) Katalin Grubits(katalin ***at***...

Philip du Toit

2009-05-12T23:59:59.000Z

430

Notice of Study Availability - Potential Benefits of Distributed...  

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

Study Availability - Potential Benefits of Distributed Generation and Rate-Related Issues That May Impede Their Expansion: Federal Register Notice Volume 72, No. 40 - Mar. 1, 2007...

431

Comprehensive Evaluation of the Geothermal Potential within the...  

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

Comprehensive Evaluation of the Geothermal Resource Potential within the Pyramid Lake Paiute Reservation Donna Marie Noel (PI)) Greg Pohll (Presenter) Pyramid Lake Paiute Tribe,...

432

Kenya-Standard Assessment of Mitigation Potential and Livelihoods...  

Open Energy Info (EERE)

Livelihoods in Smallholder Systems (SAMPLES) Jump to: navigation, search Name Kenya-Standard Assessment of Mitigation Potential and Livelihoods in Smallholder Systems (SAMPLES)...

433

Forestry-based Carbon Sequestration Projects in Africa: Potential...  

Open Energy Info (EERE)

Forestry-based Carbon Sequestration Projects in Africa: Potential benefits and challenges Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Forestry-based Carbon...

434

Microsoft Word - BPA Utility Potential Calculator Guidebook V1...  

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

energy efficiency potentials. In addition, it includes small-scale generation, demand response, fuel conversion, distributed generation and emerging technologies. California...

435

Resonance expansions of propagators in the presence of potential ...  

E-Print Network [OSTI]

We consider energy levels at which there exists a potential barrier separating the ...... dynamics and nuclear magnetic resonance signals, J. Chem. Phys.

436

New Model Demonstrates Offshore Wind Industry's Job Growth Potential...  

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

has developed a tool to estimate jobs and other economic impacts associated with offshore wind development in the United States. The modeling tool, which illustrates the potential...

437

Realizing Clean Energy's Potential: Lessons Learned in the U...  

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

conventional coal and natural gas generators more frequently to accommodate more variable wind and solar power. NREL investigated the potential wear-and-tear costs and emissions...

438

Potential Role of Exergy in Analysis of Hydrogen Infrastructure  

SciTech Connect (OSTI)

The objective of this paper is to demonstrate the potential role of exergy (second-law) analysis, as a complementary tool for economic assessments of hydrogen infrastructures.

Jalalzadeh-Azar, A. A.

2008-01-01T23:59:59.000Z

439

assessing fire potential: Topics by E-print Network  

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

humanity. The science that underlies this quest is at the frontier 22 ASSESSMENT OF HOUSEHOLD CARBON FOOTPRINT REDUCTION POTENTIALS University of California eScholarship...

440

Direct Determination of Equilibrium Potentials for Hydrogen Oxidation/Production by Open Circuit Potential Measurements in Acetonitrile  

SciTech Connect (OSTI)

Open circuit potentials were measured for acetonitrile solutions of a variety of acids and their conjugate bases under 1 atm H2. Acids examined include triethylammonium, dimethylformamidium, 2,6-dichloroanilinium, 4-cyanoanilinium, 4-bromoanilinium, and 4-anisidinium salts. These potentials, together with the pKa values of the acids, establish the value of the standard hydrogen electrode (SHE) potential in acetonitrile as ?0.028(4) V vs the ferrocenium/ferrocene couple. Dimethylformamidium is shown to form homoconjugates and other aggregates with dimethylformamide; open circuit potentials are used to quantify the extent of these reactions. Overpotentials for electrocatalytic hydrogen production and oxidation were determined from open circuit potentials and voltammograms of acidic or basic catalyst solutions under H2. This method requires neither pKa values, homoconjugation constants, nor an estimate for the SHE potential and thus allows direct comparison of catalytic systems in different media.

Roberts, John A.; Bullock, R. Morris

2013-03-14T23:59:59.000Z

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


441

Variability in the CoRoT photometry of three hot O-type stars. HD 46223, HD 46150 and HD 46966  

E-Print Network [OSTI]

The detection of pulsational frequencies in stellar photometry is required as input for asteroseismological modelling. The second short run (SRa02) of the CoRoT mission has provided photometric data of unprecedented quality and time-coverage for a number of O-type stars. We analyse the CoRoT data corresponding to three hot O-type stars, describing the properties of their light curves and we search for pulsational frequencies, which we then compare to theoretical model predictions. We determine the amplitude spectrum of the data, using the Lomb-Scargle and a multifrequency HMM-like technique. Frequencies are extracted by prewhitening, and their significance is evaluated under the assumption that the light curve is dominated by red noise. We search for harmonics, linear combinations and regular spacings among these frequencies. We use simulations with the same time sampling as the data as a powerful tool to judge the significance of our results. From the theoretical point of view, we use the MAD non-adiabatic p...

Blomme, R; Catala, C; Cuypers, J; Gosset, E; Godart, M; Montalban, J; Ventura, P; Rauw, G; Morel, T; Degroote, P; Aerts, C; Noels, A; Michel, E; Baudin, F; Baglin, A; Auvergne, M; Samadi, R

2011-01-01T23:59:59.000Z

442

THE INTRODUCTION OF POTENTIALLY INVASIVE ALIEN PLANT SPECIES FOR HORTICULTURAL  

E-Print Network [OSTI]

THE INTRODUCTION OF POTENTIALLY INVASIVE ALIEN PLANT SPECIES FOR HORTICULTURAL PURPOSES IN NORTH: The Introduction of Potentially Invasive Alien Plant Species for Horticultural Purposes in North America: Assessing/Approved: ________________________________________ #12;iii ABSTRACT Invasive alien plant species are known to cause significant economic and ecological

443

Biomass energy: the scale of the potential resource  

E-Print Network [OSTI]

Biomass energy: the scale of the potential resource Christopher B. Field1 , J. Elliott Campbell1 Avenue, Livermore, CA 94550, USA Increased production of biomass for energy has the potential to offset resources and decrease food security. The net effect of biomass energy agriculture on climate could

444

BIOMASS FOR HYDROGEN AND OTHER TRANSPORT FUELS -POTENTIALS, LIMITATIONS & COSTS  

E-Print Network [OSTI]

BIOMASS FOR HYDROGEN AND OTHER TRANSPORT FUELS - POTENTIALS, LIMITATIONS & COSTS Senior scientist - "Towards Hydrogen Society" ·biomass resources - potentials, limits ·biomass carbon cycle ·biomass for hydrogen - as compared to other H2- sources and to other biomass paths #12;BIOMASS - THE CARBON CYCLE

445

Hawaii Bioenergy Master Plan Potential Environmental Impacts of  

E-Print Network [OSTI]

Hawaii Bioenergy Master Plan Potential Environmental Impacts of Bioenergy Development in Hawaii of the potential environmental impacts associated with bioenergy development in Hawaii was conducted as part of the Hawaii Bioenergy Master Plan mandated by Act 253 of the Hawaii State Legislature in 2007. This effort

446

Potential Supply Impacts of Removal of 1-Pound RVP Waiver  

E-Print Network [OSTI]

by the Office of Oil and Gas of the Energy Information Administration. General questions concerning the report, Petroleum Division #12;1 Energy Information Administration/Potential Supply Impacts of Removal of 1-Pound;2 Energy Information Administration/Potential Supply Impacts of Removal of 1-Pound Waiver provides

Patzek, Tadeusz W.

447

As of: September 2005 Waste Incineration --A Potential Danger?  

E-Print Network [OSTI]

As of: September 2005 Waste Incineration -- A Potential Danger? Bidding Farewell to Dioxin Spouting #12;2 Waste Incineration -- A Potential Danger? Bidding Farewell to Dioxin Spouting In the eighties of the previous century, waste incineration plants (WIPs) came to be the symbol of environmental contamination

Columbia University

448

Shale Gas Production: Potential versus Actual GHG Emissions  

E-Print Network [OSTI]

Shale Gas Production: Potential versus Actual GHG Emissions Francis O'Sullivan and Sergey Paltsev, and environmental effects. In turn, the greenhouse gas and atmospheric aerosol assumptions underlying climate://globalchange.mit.edu/ Printed on recycled paper #12;1 Shale Gas Production: Potential versus Actual GHG Emissions Francis O

449

Shale gas production: potential versus actual greenhouse gas emissions*  

E-Print Network [OSTI]

Shale gas production: potential versus actual greenhouse gas emissions* Francis O, monitor and verify greenhouse gas emissions and climatic impacts. This reprint is one of a series intended Environ. Res. Lett. 7 (2012) 044030 (6pp) doi:10.1088/1748-9326/7/4/044030 Shale gas production: potential

450

Second harmonic imaging of membrane potential of neurons with retinal  

E-Print Network [OSTI]

Second harmonic imaging of membrane potential of neurons with retinal Boaz A. Nemet Volodymyr of neurons, using the nonlinear optical phenom- enon of second harmonic generation (SHG) with a photopigment reti- nal as the chromophore [second harmonic retinal imaging of mem- brane potential (SHRIMP)]. We

Columbia University

451

Infrared absorption spectra, radiative efficiencies, and global warming potentials  

E-Print Network [OSTI]

Infrared absorption spectra, radiative efficiencies, and global warming potentials of newly.mdpi.com/journal/atmosphere Article Infrared Absorption Spectra, Radiative Efficiencies, and Global Warming Potentials of Newly of 600­1730 cm-1 . These spectra are then used to calculate the radiative efficiencies and global warming

Wirosoetisno, Djoko

452

The Potential for Wind Energy in Atlantic Canada  

E-Print Network [OSTI]

The Potential for Wind Energy in Atlantic Canada Larry Hughes and Sandy Scott Whale Lake Research World Renewable Energy Congress, Reading, September 1992. #12;Hughes/Scott: Wind Energy in Atlantic Canada 1 The Potential for Wind Energy in Atlantic Canada Abstract Canadians are among the highest per

Hughes, Larry

453

Calcite Mineral Scaling Potentials of High-Temperature Geothermal Wells  

E-Print Network [OSTI]

#12;i Calcite Mineral Scaling Potentials of High-Temperature Geothermal Wells Alvin I. Remoroza-Temperature Geothermal Wells Alvin I. Remoroza 60 ECTS thesis submitted in partial fulfillment of a Magister Scientiarum #12;iv Calcite Mineral Scaling Potentials of High-Temperature Geothermal Wells 60 ECTS thesis

Karlsson, Brynjar

454

Offshore Wind Power Experiences, Potential and Key Issues for  

E-Print Network [OSTI]

Offshore Wind Power Experiences, Potential and Key Issues for Deployment Jørgen Lemming, Poul Erik-Erik Clausen Title: Offshore Wind Power Experiences, Potential and Key Issues for Deployment Division: VEA, SYS Risø-R-1673(EN) January 2008 Abstract: Wind power has been growing at spectacular rates. Today

455

Dyons with potentials: Duality and black hole thermodynamics  

SciTech Connect (OSTI)

A modified version of the double potential formalism for the electrodynamics of dyons is constructed. Besides the two vector potentials, this manifestly duality invariant formulation involves four additional potentials, scalar potentials which appear as Lagrange multipliers for the electric and magnetic Gauss constraints and potentials for the longitudinal electric and magnetic fields. In this framework, a static dyon appears as a Coulomb-like solution without string singularities. Dirac strings are needed only for the Lorentz force law, not for Maxwell's equations. The magnetic charge no longer appears as a topological conservation law but as a surface integral on a par with electric charge. The theory is generalized to curved space. As in flat space, the string singularities of dyonic black holes are resolved. As a consequence all singularities are protected by the horizon and the thermodynamics is shown to follow from standard arguments in the grand canonical ensemble.

Barnich, Glenn; Gomberoff, Andres [Physique Theorique et Mathematique, Universite Libre de Bruxelles and International Solvay Institutes, Campus Plaine C.P. 231, B-1050 Bruxelles (Belgium); Universidad Nacional Andres Bello, Av. Republica 239, Santiago (Chile)

2008-07-15T23:59:59.000Z

456

The earth's absolute gravitation potential function in the prospect 'gravitational potential metering' of geological objects and earthquake centers  

E-Print Network [OSTI]

The direct problem of the detection of the Earth's absolute gravitation potential maximum value (MGP) was solved. The inverse problem finding of the Earth maximum gravitation (where there is a maximum of gravitation field intensity and a potential function has a 'bending point') with the help of MGP was solved as well. The obtained results show that the revealed Earth maximum gravitation coincides quite strictly with the cseismic D" layer on the border of the inner and outer (liquid) core. The validity of the method of an absolute gravitation potential detection by the equal- potential velocity was proved as 'gravitation potential measurement' or 'Vs-gravity method'. The prospects of this method for detecting of low-power or distant geological objects with abnormal density and the possible earthquakes with low density was shown.

Aleksandr Fridrikson; Marina Kasatochkina

2009-04-08T23:59:59.000Z

457

Calculation of molecular free energies in classical potentials  

E-Print Network [OSTI]

Free energy calculations in molecular simulations are used to predict the strength of molecular processes such as binding and solvation. We present an accurate and complete calculation of molecular free energies in standard classical potentials. In this method we transform the molecule by relaxing potential terms that depend on the coordinates of a group of atoms in that molecule and calculate the free energy difference associated with the transformation. Then, since the transformed molecule can be treated as non interacting systems, the free energy associated with these atoms is analytically or numerically calculated. We suggest the potential application of free energy calculation of chemical reactions in classical molecular simulations.

Farhi, Asaf

2015-01-01T23:59:59.000Z

458

Flat space (higher spin) gravity with chemical potentials  

E-Print Network [OSTI]

We introduce flat space spin-3 gravity in the presence of chemical potentials and discuss some applications to flat space cosmology solutions, their entropy, free energy and flat space orbifold singularity resolution. Our results include flat space Einstein gravity with chemical potentials as special case. We discover novel types of phase transitions between flat space cosmologies with spin-3 hair and show that the branch that continuously connects to spin-2 gravity becomes thermodynamically unstable for sufficiently large temperature or spin-3 chemical potential.

Michael Gary; Daniel Grumiller; Max Riegler; Jan Rosseel

2014-11-24T23:59:59.000Z

459

Diffusion in a potential landscape with stochastic resetting  

E-Print Network [OSTI]

The steady state of a Brownian particle diffusing in an arbitrary potential under the stochastic resetting mechanism has been studied. We show that there are different classes of nonequilibrium steady states depending on the nature of the potential. In the stable potential landscape, the system attains a well defined steady state however existence of the steady state for the unstable landscape is constrained. We have also investigated the transient properties of the propagator towards the steady state under the stochastic resetting mechanism. Finally, we have done numerical simulations to verify our analytical results.

Arnab Pal

2014-08-09T23:59:59.000Z

460

Potential vorticity in the thermocline of the Yucatan current  

E-Print Network [OSTI]

-H-6 19 7. The acceleration potential and geostrophic velocity, on the specific volume anomaly surface of Z50 centiliters per ton, at section II as a function of distance along the section. The location of section II is given in Figure 12 23 8.... Isopleths of acceleration potential in dynamic centimeters on the surface where the specific volume anomaly is equal to 200 centiliters per ton 25 9, Isopleths of acceleration potential in dynamic centi- meters on the surface where the specific volume...

Ahrens, John

1965-01-01T23:59:59.000Z

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


461

Framework for State-Level Renewable Energy Market Potential Studies  

SciTech Connect (OSTI)

State-level policymakers are relying on estimates of the market potential for renewable energy resources as they set goals and develop policies to accelerate the development of these resources. Therefore, accuracy of such estimates should be understood and possibly improved to appropriately support these decisions. This document provides a framework and next steps for state officials who require estimates of renewable energy market potential. The report gives insight into how to conduct a market potential study, including what supporting data are needed and what types of assumptions need to be made. The report distinguishes between goal-oriented studies and other types of studies, and explains the benefits of each.

Kreycik, C.; Vimmerstedt, L.; Doris, E.

2010-01-01T23:59:59.000Z

462

Non-Uniqueness of the Lienard-Wiechert Potential  

E-Print Network [OSTI]

The Lienard-Wiechert potential is one of the central equations of classical electrodynamics. Among its properties are these: it satisfies the (linear) homogeneous wave equation and Lorenz Gauge condition in free space, it varies inversely with distance from the classical point-source that is movong arbitrarily, and its effects propagate along straight lines at constant speed (the speed of light). Do any other retarded potentials satisfy these properties? It is shown here that other such potentials do exist, and a general formula is derived.

Andrew T. Hyman

2013-08-17T23:59:59.000Z

463

Spectra generated by a confined softcore Coulomb potential  

E-Print Network [OSTI]

Analytic and approximate solutions for the energy eigenvalues generated by a confined softcore Coulomb potentials of the form a/(r+\\beta) in d>1 dimensions are constructed. The confinement is effected by linear and harmonic-oscillator potential terms, and also through `hard confinement' by means of an impenetrable spherical box. A byproduct of this work is the construction of polynomial solutions for a number of linear differential equations with polynomial coefficients, along with the necessary and sufficient conditions for the existence of such solutions. Very accurate approximate solutions for the general problem with arbitrary potential parameters are found by use of the asymptotic iteration method.

Richard L Hall; Nasser Saad

2014-07-28T23:59:59.000Z

464

Studies on the bound-state spectrum of hyperbolic potential  

E-Print Network [OSTI]

Bound states of hyperbolic potential is investigated by means of a generalized pseudospectral method. Significantly improved eigenvalues, eigenfunctions are obtained efficiently for arbitrary $n, \\ell$ quantum states by solving the relevant non-relativistic Schr\\"odinger equation allowing a non-uniform, optimal spatial discretization. Eigenvalues accurate up to tenth decimal place are reported for a large range of potential parameters; thus covering a wide range of interaction. Excellent agreement with available literature results is observed in all occasions. Special attention is paid for higher states. Some new states are given. Energy variations with respect to parameters in the potential are studied in considerable detail for the first time.

Amlan K. Roy

2014-09-08T23:59:59.000Z

465

action potential energy: Topics by E-print Network  

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

wk old, were prepared as described previously (HoffmanCA1 Johnston, Daniel 7 SOLAR ENERGY POTENTIALS CiteSeer Summary: In recent years solar energy has experienced phenomenal...

466

Refinements in Effective Potential Calculations in the MSSM  

E-Print Network [OSTI]

The one-loop effective potential is a powerful tool in studying the electroweak symmetry breaking of supersymmetric theories, whose precise calculation may have important phenomenological consequences. In this work, we are correctly treating the contribution of the Higgs sector to the effective potential and refine the radiative corrections to the Higgs mixing parameter $\\mu$, which is known to affect greatly the supersymmetric spectrum. Working at the average stop scale to minimize the effect of the stop sector, we find additional corrections which can play a dominant role in the Focus Point region of the parameter space of the MSSM. The comparison of our results with those of the literature is discussed. We also discuss the gauge dependence of the effective potential and its effect on the $\\mu$ parameter in analyses where this is determined from the 1-loop minimization conditions of the effective potential.

M. Argyrou; A. Katsikatsou; I. Malamos

2006-02-17T23:59:59.000Z

467

The potential business impacts of Semantic Web for system integration  

E-Print Network [OSTI]

This thesis presents research about the potential business impacts of the Semantic Web. The concept of the Semantic Web is an expansion of the Web for computers, enabling them to comprehend the meaning of information. In ...

Saita, Akio, 1972-

2004-01-01T23:59:59.000Z

468

Conservation Potential of Compact Fluorescent Lamps in India and Brazil  

E-Print Network [OSTI]

1.7% of in- stalled hydroelectric capacity. Op. cit. ref [in Ig86) based on hydroelectric generation, and most of thethe still abundant hydroelectric potential of the country.

Gadgil, A.J.

2008-01-01T23:59:59.000Z

469

Copper Aluminate as a potential material for high temperature...  

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

Copper Aluminate as a potential material for high temperature thermoelectric power generation Home Author: D. T. Morelli, E. D. Case, B. D. Hall, S. Wang Year: 2008 Abstract: URL:...

470

Computational studies of polysiloxanes : oxidation potentials and decomposition reactions.  

SciTech Connect (OSTI)

Silicon-containing solvents have tremendous potential for application as electrolytes for electrical energy storage devices such as lithium-ion (air) batteries and supercapacitors. Quantum chemical methods were employed to investigate trends in oxidation potentials and decomposition reactions of a series of polysiloxanes. Various electron-donating and -withdrawing substituents can be used to tune the oxidation potential in shorter chain siloxanes but not in longer ones. Decomposition reactions of siloxanes in their oxidized states were investigated and compared against their carbon analogues. These studies suggest that the Si-O group provides added stability for siloxanes over their carbon analogues. Computational studies have also been performed for various disiloxanes and siloxanes with spacer groups to understand their thermochemical stability and oxidation potentials.

Assary, R. S.; Curtiss, L. A.; Redfern, P. C.; Zhang, Z.; Amine, K. (Center for Nanoscale Materials); ( CSE); ( MSD); (Northwestern Univ.)

2011-06-23T23:59:59.000Z

471

Geology, Water Geochemistry And Geothermal Potential Of The Jemez...  

Open Energy Info (EERE)

Geology, Water Geochemistry And Geothermal Potential Of The Jemez Springs Area, Canon De San Diego, New Mexico Jump to: navigation, search OpenEI Reference LibraryAdd to library...

472

COMPARISON OF NUTRIENT DATA FROM FOUR POTENTIAL OTEC SITES  

E-Print Network [OSTI]

Thermal Energy Con- version (OTEC) sites; Puerto Rico, St.THermal Energy Conversion (OTEC) Program, PreoperationalDATA FROM FOUR POTENTIAL OTEC SITES Mary S. Quinby-Hunt June

Quinby-Hung, M.S.

2010-01-01T23:59:59.000Z

473

Microbial Community Composition Is Unaffected by Anode Potential Xiuping Zhu,  

E-Print Network [OSTI]

SHE).2,6 This voltage can be produced by an external power source, or through insertion of a reverse electrodialysis stack between the electrodes.7,8 The anode potential can influence the performance of BESs.9

474

Technical Information Exchange on Pyrolysis Oil: Potential for...  

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

Exchange on Pyrolysis Oil: Potential for a Renewab;e Heating Oil Substation Fuel in New England April 2012 Biomass Program News Blast June 2012 News Blast: Algae on the Mind...

475

advancing age potential: Topics by E-print Network  

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

old, 12-month old, and adult) based on auditory event-related potentials Reilly, James P. 10 Paradoxical down?regulation of p16 INK4a mRNA with advancing age in Acute...

476

Effective Semi-empirical Interaction Potential for Dusty Particles  

SciTech Connect (OSTI)

The Poisson equation was numerically solved on the basis of the experimental correlation functions of dusty particles. Calculations were performed with real parameters of dusty plasma. Reconstructed potential has oscillated character; the minimums coincide to maximums of correlation functions.

Ramazanov, T. S.; Dzhumagulova, K. N.; Omarbakiyeva, Y. A.; Dosbolayev, M. K.; Jumabekov, A. N. [IETP, al-Farabi Kazakh National University, 96a, Tole bi St., 050012, Almaty (Kazakhstan)

2008-09-07T23:59:59.000Z

477

Radiolysis Model Formulation for Integration with the Mixed Potential...  

Office of Scientific and Technical Information (OSTI)

Mixed Potential Model Re-direct Destination: The U.S. Department of Energy Office of Nuclear Energy (DOE-NE), Office of Fuel Cycle Technology has established the Used Fuel...

478

Semiconductor nanowire array: potential substrates for photocatalysis and photovoltaics  

E-Print Network [OSTI]

Semiconductor nanowire array: potential substrates for photocatalysis and photovoltaics Yiying Wu, these nanowire arrays could find unique applications in photocatalysis and photovoltaics. KEY WORDS luminescence efficiency [5,6], enhancement of thermoelectric figure of merit [7] and lowered lasing threshold

Yang, Peidong

479

Periodic Discrete Energy for Long-Range Potentials  

E-Print Network [OSTI]

We consider periodic energy problems in Euclidean space with a special emphasis on long-range potentials that cannot be defined through the usual infinite sum. One of our main results builds on more recent developments of Ewald summation to define the periodic energy corresponding to a large class of long-range potentials. Two particularly interesting examples are the logarithmic potential and the Riesz potential when the Riesz parameter is smaller than the dimension of the space. For these examples, we use analytic continuation methods to provide concise formulas for the periodic kernel in terms of the Epstein Hurwitz Zeta function. We apply our energy definition to deduce several properties of the minimal energy including the asymptotic order of growth and the distribution of points in energy minimizing configurations as the number of points becomes large. We conclude with some detailed calculations in the case of one dimension, which shows the utility of this approach.

D. P. Hardin; E. B. Saff; Brian Simanek

2014-12-11T23:59:59.000Z

480

Furnace Blower Electricity: National and Regional Savings Potential  

E-Print Network [OSTI]

Solar Energy Center ABSTRACT Currently, total electricity consumption of furnacesFurnace Blower Electricity: National and Regional Savings Potential Victor Franco, James Lutz, Alex Lekov, and Lixing Gu (Florida Solar

Franco, Victor; Florida Solar Energy Center

2008-01-01T23:59:59.000Z

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481

Potential of Evaporative Cooling Systems for Buildings in India  

E-Print Network [OSTI]

Evaporative cooling potential for building in various climatic zones in India is investigated. Maintainable indoor conditions are obtained from the load - capacity analysis for the prevailing ambient conditions. For the assumed activity level...

Maiya, M. P.; Vijay, S.

2010-01-01T23:59:59.000Z

482

Evaluation of the commercial potential of novel organic photovoltaic technologies  

E-Print Network [OSTI]

Photovoltaic cells based on organic semiconducting materials have the potential to compete with the more mature crystalline and thin film based photovoltaic technologies in the future primarily due to the expectation of ...

Barr, Jonathan (Jonathan Allan)

2005-01-01T23:59:59.000Z

483

analysis reveals potential: Topics by E-print Network  

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

Last Page Topic Index 1 Genetic Analysis in Populus Reveals Potential to Enhance Soil Carbon Sequestration In a paper published in the August, 2005 issue of Canadian Journal of...

484

Quick Links USC Gets Grant to Study Potential  

E-Print Network [OSTI]

on threats to electrical power plants, transportation and telecommunication systems, and other infrastructure and Di L.A. Terror Threa THREAT or 1-877-284-7328 Page 1 of 2abc7.com: USC Gets Grant to Study Potential

Southern California, University of

485

Quantifying National Energy Savings Potential of Lighting Controls in  

E-Print Network [OSTI]

Quantifying National Energy Savings Potential of Lighting Controls in Commercial Buildings Alison of Lighting Controls in Commercial Buildings Alison Williams, Barbara Atkinson, Karina Garbesi and Francis savings. Researchers have been quantifying energy savings from lighting controls in commercial buildings

486

Furnace Blower Electricity: National and Regional Savings Potential  

E-Print Network [OSTI]

A. , Wong-Parodi, G. 2006. BPM Motors in Residential Gasbe more than the potential savings from BPM blower motors.Overall, it appears the BPM blower motors used in two-stage

Franco, Victor; Florida Solar Energy Center

2008-01-01T23:59:59.000Z

487

act mtca potential: Topics by E-print Network  

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

Lorbeer, B; Zhang, P 2012-01-01 2 Realizing Health Reforms Potential The Affordable Care Acts Pre-Existing Condition Insurance Plan: Enrollment, Costs, and Lessons for Reform...

488

Technical Information Exchange on Pyrolysis Oil: Potential for...  

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

Renewab;e Heating Oil Substation Fuel in New England Technical Information Exchange on Pyrolysis Oil: Potential for a Renewab;e Heating Oil Substation Fuel in New England This...

489

Auditory evoked potentials and electroencephalograms correlates to intracranial pressure  

E-Print Network [OSTI]

for the degree of MASTER OF SCIENCE December 1992 Major Subject: Bioengineering AUDITORY EVOKED POTENTIALS AND ELECTROENCEPHALOGRAMS CORRELATES TO INTRACRANIAL PRESSURE A Thesis MAHESH CHANDRASEKHAR Approved as to style and content by: C. ' C. S.... Lessard (Chair of Committee) E. M. Bailey (Member) G. L. C e (Member) !' G. . Hog (Hearl of Departme December 1992 ABSTRACT Auditory Evoked Potentials and Electroencephalograms Correlates to Intracranial Pressure. (December 1992) Mahesh...

Chandrasekhar, Mahesh

2012-06-07T23:59:59.000Z

490

The confluent supersymmetry algorithm for Dirac equations with pseudoscalar potentials  

SciTech Connect (OSTI)

We introduce the confluent version of the quantum-mechanical supersymmetry formalism for the Dirac equation with a pseudoscalar potential. Application of the formalism to spectral problems is discussed, regularity conditions for the transformed potentials are derived, and normalizability of the transformed solutions is established. Our findings extend and complement former results [L. M. Nieto, A. A. Pecheritsin, and B. F. Samsonov, Intertwining technique for the one-dimensional stationary Dirac equation, Ann. Phys. 305, 151189 (2003)].

Contreras-Astorga, Alonso, E-mail: aloncont@iun.edu; Schulze-Halberg, Axel, E-mail: axgeschu@iun.edu, E-mail: xbataxel@gmail.com [Department of Mathematics and Actuarial Science and Department of Physics, Indiana University Northwest, 3400 Broadway, Gary, Indiana 46408 (United States)

2014-10-15T23:59:59.000Z

491

On the acceleration potential in perfect fluid flow  

E-Print Network [OSTI]

ON THE ACCELERATION POTENTIAL IN PERFECT FLUID FLOW A Thesis By RAYMOND RUDOLPH MAESTRI Submitted. to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfrllment of the requirements for the degree of MASTER... OF SCIENCE August, 1960 Department of Aeronautical Engineering Major Subject: Aeronautical Engineering ON THE ACCELERATION POTENTIAL IN PERFECT FLUID FLOW A Thesis RAYMOND RUDOLPH MAESTRI Approved as to style and content by: Chairman of Commit e...

Maestri, Raymond Rudolph

1960-01-01T23:59:59.000Z

492

Biogas Potential in the United States (Fact Sheet)  

SciTech Connect (OSTI)

Biogas has received increased attention as an alternative energy source in the United States. The factsheet provides information about the biogas (methane) potential from various sources in the country (by county and state) and estimates the power generation and transportation fuels production (renewable natural gas) potential from these biogas sources. It provides valuable information to the industry, academia and policy makers in support of their future decisions.

Not Available

2013-10-01T23:59:59.000Z

493

New Exactly Solvable Isospectral Partners for PT Symmetric Potentials  

E-Print Network [OSTI]

We examine in detail the possibilty of applying Darboux transformation to non Hermitian hamiltonians. In particular we propose a simple method of constructing exactly solvable PT symmetric potentials by applying Darboux transformation to higher states of an exactly solvable PT symmetric potential. It is shown that the resulting hamiltonian and the original one are pseudo supersymmetric partners. We also discuss application of Darboux transformation to hamiltonians with spontaneously broken PT symmetry.

Anjana Sinha; Pinaki Roy

2003-12-18T23:59:59.000Z

494

Off-energy-shell behavior of realistic potential models  

SciTech Connect (OSTI)

The behavior of the fully-off-the-energy-shell T matrices for the Reid-soft-core and Paris-80 potentials are studied for a variety of partial waves, both uncoupled and coupled. Although the potentials have qualitatively different structures in both coordinate space and momentum space, the resulting off-energy-shell behavior is very similar in the range of energy and momentum relevant to low and medium energy nuclear physics.

Redish, E.F.; Stricker-Bauer, K.

1987-08-01T23:59:59.000Z

495

Two-Color QCD with Chiral Chemical Potential  

E-Print Network [OSTI]

The phase diagram of two-color QCD with a chiral chemical potential is studied on the lattice. The focus is on the confinement/deconfinement phase transition and the breaking/restoration of chiral symmetry. The simulations are carried out with dynamical staggered fermions without rooting. The dependence of the Polyakov loop, the chiral condensate and the corresponding susceptibilities on the chiral chemical potential and the temperature are presented.

V. V. Braguta; V. A. Goy; E. -M. Ilgenfritz; A. Yu. Kotov; A. V. Molochkov; M. Muller-Preussker; B. Petersson; A. Schreiber

2014-11-19T23:59:59.000Z

496

Chemical Potential Jump during Evaporation of a Quantum Bose Gas  

E-Print Network [OSTI]

The dependence of the chemical potential jump coefficient on the evaporation coefficient is analyzed for the case in which the evaporating component is a Bose gas. The concentration of the evaporating component is assumed to be much lower than the concentration of the carrier gas. The expression for the chemical potential jump is derived from the analytic solution of the problem for the case in which the collision frequency of molecules of the evaporating component is constant.

E. A. Bedrikova; A. V. Latyshev

2013-01-07T23:59:59.000Z

497

Global warming potentials and radiative efficiencies of halocarbons and related  

E-Print Network [OSTI]

Global warming potentials and radiative efficiencies of halocarbons and related compounds4599857392 CentAUR #7326E125C47E3E3C7E=472B43!E.E07D4 07D4:BE27B725CE9393BE647 #12;GLOBAL WARMING POTENTIALS. In addition, we provide a comprehensive and self-consistent set of new calculations of REs and global warming

Wirosoetisno, Djoko

498

Qualitative Aspects of Classical Potential Andreas Knauf \\Lambda  

E-Print Network [OSTI]

, then the corresponding energy is trapping, and orbits, visiting these sup­ ports in any prescribed succession, can­empty and not homeomorphic to a sphere. For non­trapping energies we introduce a topological degree which can be non­trivial for low energies, and for Coulombic and other singu­ lar potentials. A sum of non­trapping potentials

499

Property:PotentialOnshoreWindCapacity | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformationPotentialOffshoreWindArea Jump to:PotentialOnshoreWindCapacity

500

Property:PotentialRooftopPVCapacity | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformationPotentialOffshoreWindArea JumpPotentialRooftopPVCapacity Jump to: