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Sample records for hd ngv potential

  1. Utilities building NGV infrastructure

    SciTech Connect (OSTI)

    Not Available

    1994-04-01

    Gas utilities across the US are aggressively pursuing the natural gas vehicle market by putting in place the infrastructure needed to ensure the growth of the important market. The first annual P and GJ NGV Marketing Survey has revealed many utilities plant to build and continue building NGV fueling facilities. The NGV industry in the US is confronting a classic chicken-or-egg quandary. Fleet operators and individual drivers are naturally unwilling to commit to a natural gas vehicle fuel until sufficient fueling facilities are in place, yet service station operators are reluctant to add NGV refueling capacity until enough CNG vehicles are on the road to create demand. The future of the NGV market is bright, but continued research and product improvements by suppliers as well as LDCs is needed if the potential is to be fulfilled. Advances in refueling facilities must continue if the market is to develop.

  2. NGV industry infrastructure

    SciTech Connect (OSTI)

    Not Available

    1984-12-01

    Current natural gas vehicle (NGV) technology faces a number of problems that must be overcome before vehicles powered by compressed natural gas become accepted in the US. Among these impediments are regulatory uncertainties, codes, standards and the NGV industry infrastructure itself. The marketing/supply infrastructure necessary to support the NGV industry is described.

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

    E-Print Network [OSTI]

    Growth of the NGV Market:Growth of the NGV Market: Lessons LearnedLessons Learned Roadmap NGVAmerica #12;""Roadmap For Development ofRoadmap For Development of NGV Fueling InfrastructureNGV FuelingData Collection Section · Report defines underlying problem with current data ­ Lack of fuel consumption and NGV

  4. 1996: Year of the NGV

    SciTech Connect (OSTI)

    Zilberfarb, G.

    1995-10-01

    The strategy for the development of a natural gas vehicle (NGV) market focuses on the high-fuel fleet-vehicle market. Six tasks have been outlined by the natural gas industry and their organizations. This article explains Task 3 which asks gas companies to show their support for NGVs by leading the way in fleet procurement, fueling infrastructure, marketing and research and development. The eight subtasks of Task 3 are described.

  5. Growth of the NGV Market: Lessons Learned Roadmap for Infrastructure...

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

    Growth of the NGV Market: Lessons Learned Roadmap for Infrastructure Development Growth of the NGV Market: Lessons Learned Roadmap for Infrastructure Development Presented at...

  6. Advanced NGV research key to market success

    SciTech Connect (OSTI)

    Davidson, K.G.; Schaedel, S.V. (Gas Research Inst., Chicago, IL (United States))

    1993-12-01

    This paper reviews the current research for natural gas vehicles (NGV) and the progress made toward the use of this fuel. It discusses the design of engine components and the cost as compared to conventional combustion components. It discusses the prices and availability of conversion kits which are capable of converting standard gasoline-powered vehicles into NGV's. It also discusses the range of such vehicles and the problems in storage associated with NGV's. The paper provides a good, technology briefing for this type of vehicle.

  7. Final Report on National NGV Infrastructure

    SciTech Connect (OSTI)

    GM Sverdrup; JG DeSteese; ND Malcosky

    1999-01-07

    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.

  8. Dual-fueling diesel/NGV technology

    SciTech Connect (OSTI)

    Heenan, J.; Gettel, L

    1988-01-01

    The use of natural gas as a transportation fuel reduces operating costs and emissions and contributes to security of supply. Natural gas for vehicles (NGV) can be used in rail, road, marine and off-road applications as a replacement for diesel fuel either stored as liquefied natural gas (LNG) or compressed natural gas (CNG). These applications have large energy consumptions per engine which makes them attractive target markets. When NGV replaces diesel as a fuel, either engines are converted to spark ignition (Otto Cycle) or a small amount of diesel fuel is used as for pilot ignition (Dual fuel).

  9. Fuel system pressure control improves NGV performance

    SciTech Connect (OSTI)

    Heenan, J.S.

    1996-09-01

    The use of natural gas as a transportation fuel can offer: emissions and environmental benefits; energy diversity and security. Current reports suggest there are about 1,000,000 natural gas vehicles (NGV) operating around the world. One key component of NGV systems is the pressure regulator. Without accurate pressure regulation it is difficult, and costly, to obtain low emissions and good performance benefits from NGV. The paper discusses a precision, NGV, pressure regulator for fuel injection applications. Critical features of any regulator are flow and pressure output (P{sub out}) error. P{sub out} errors include droop, creep and hysteresis. Fuel injector inlet pressures vary depending on the system design approach. Normally fuel injector inlet pressures vary between 1.7 to 17 bar. Additional topics of discussion include heat exchanger control, using manifold absolute pressure (MAP) to bias the regulator and the effects of undersized inlet and outlet fittings and hoses. Also supplied are comparative emissions test results for one and two-stage regulators. The paper concludes that precision pressure regulation is a cost-effective method to obtain low emissions and good performance.

  10. Fracture mechanics analysis of NGV fuel cylinders. Part 1. Steel cylinders. Topical report, August 1989-February 1993. [NGV (Natural Gas Vehicles)

    SciTech Connect (OSTI)

    Connolly, M.P.; Hudak, S.J.; Roy, S.

    1993-02-01

    Compressed natural gas (CNG) cylinders for natural gas vehicles (NGVs) are subject to a combination of pressure cycles, associated with periodic refueling, and a potentially corrosive CNG environment. Under these conditions it has been shown that the life of the cylinder is governed by the corrosion-fatigue crack growth of internal flaws such as voids, pits or folds that may be present after manufacture. For NGV applications, these cylinders are required to operate for at least 15 years and the report, through a detailed fracture mechanics analysis, describes approaches to achieving the desired life. The analysis shows that a 15 year cylinder life can be obtained by using quality control to ensure that no initial defects greater than 0.045 in. X 0.090 in. exist after manufacture. Alternatively, gas drying can be used at the distribution stations to reduce the detrimental effects of the remaining CNG impurities, and thereby, produce long cylinder lives. The analysis also considers the role of in-service inspection/retest and shows that in-service NDE has little advantage, either technically or economically, for ensuring the fitness-for-service of steel NGV cylinders. The analysis also shows that hydrostatic testing of cylinders, either at manufacture or in service, is ineffective for detecting fatigue cracks and therefore should not be implemented as part of a fitness-for-service plan for NGV fuel cylinders. The issue of cylinder geometry was also considered and the analysis shows that improperly designed flat-bottomed CNG cylinders can result in premature fatigue failures originating at the inner wall in the transition region between the cylinder end and sidewall.

  11. An answer to the NGV conundrum. [Natural Gas Vehicles

    SciTech Connect (OSTI)

    Katz, M.G.

    1994-09-01

    Natural gas utilities and others considering whether to build fueling stations for natural gas vehicles (NGVs) have been troubled for years by the question, ''Even if one builds them, will vehicle operators convert to natural gas '' Setting up an NGV fueling station, after all, can cost $250,000 to $500,000. Some local distribution companies (LDCs) are discovering success by working to create coalitions of public and private organizations interested in NGVs. Through such private/public coalitions, it is possible to get action simultaneously on both fueling stations and vehicle conversions to natural gas. That by itself can end the contradictory situation that has stymied NGV development for years: vehicle owners delaying vehicle conversion until there are more stations, and fueling companies delaying station construction until there are more NGVs. Coalition members include virtually anyone with a fleet of vehicles. The paper discusses the purposes of such coalitions and what they are accomplishing.

  12. Identification of service environment of NGV fuel cylinders. Final report, April-June 1994

    SciTech Connect (OSTI)

    Herridge, J.T.; Stephens, D.R.; Malcosky, N.D.; Danhof, S.N.; Hattery, G.R.

    1994-07-01

    The objective of this investigation was to identify the range of service environments to which natural gas vehicle (NGV) fuel cylinders are likely to be subjected.

  13. GRI`s cylinder safety task force research program and recommendations to NGV users

    SciTech Connect (OSTI)

    NONE

    1994-11-01

    Results of recent research on natural gas vehicle (NGV) cylinder safety are summarized, and recommendations are provided related to the cylinder ruptures that occurred early in 1994 in California and Minnesota, involving 1992 and 1993 dedicated natural gas GMC/PAS Sierra pickup trucks. Analysis of the ruptures revealed that they were due to acid-induced stress corrosion cracking (SCC) of the cylinder overwrap. The research program included a composite experts review meeting, five research projects, periodic peer review of contractor progress, and dissemination of results to the NGV industry and NGV users.

  14. Evaluation of sensors for NGV and fueling station applications. Topical report, November 1994-January 1996

    SciTech Connect (OSTI)

    Huebler, J.E.; Blazek, C.F.

    1996-05-01

    The commercial success of the Natural Gas Vehicles (NGV) requires the availability of sensors to make critical measurements, such as mass flow, gas composition, temperature, pressure, moisture, density, engine load, strain, etc. Engine, engine control, compressor, and dispenser manufacturers and fueling station packagers were surveyed to determine sensor use and needs. Their general comments on needed sensor improvements, detailed sensor specifications, and sensor priorities are given. Exhaust oxygen, mass flow, and gas composition were identified as the sensors of most concern. Because they deal with issues unique to NGV technology, evaluation of sensor technologies was limited to gas composition sensors. Sensor of principal concern for this application included: (1) on-board, in-line, feed forward devices and (2) fueling station monitors. Through an extensive survey, a baseline of information on gas composition sensors and emerging technologies for the NGV community was developed.

  15. NGV stations based on mobile tube trailers: An economic analysis. Final report, June 1994-January 1995

    SciTech Connect (OSTI)

    Keder, J.; Darrow, K.

    1995-01-01

    This report assesses the technical and economic issues associated with the use of mobile tube trailers for Natural Gas Vehicle (NGV) refueling stations. Specifically, this report examines the mobile tube trailer concept developed by Pacific Cryongenics, Inc. and Pacific Gas and Electric. Mobile tube trailers are filled with compressed natural gas (CNG) at an underutilized compressor station and transported to satellite station locations. NGVs are filled at the satellite stations usig compressed gas from the tube trailer. Results of the economic analysis show that, under various operating conditions, the mobile tube trailer concept provides a cost effective alternative to NGV refueling stations with permanent compressors. In addition, the tube trailers were found to provide a substantial load for undertutilized compressor stations, resulting in reduced CNG costs at existing stations.

  16. NGV fleet fueling station business plan: A public, private and utility partnership to identify economical business options for implementation of CNG fueling infrastructure

    SciTech Connect (OSTI)

    Not Available

    1993-07-01

    The City of Long Beach recently incorporated an additional 61 natural gas vehicles (NGV) within its own fleet, bringing the City`s current NGV fleet to 171 NGVs. During January 1992, the City opened its first public access compressed natural gas (CNG) fueling station (86 CFM). This action served as the City`s first step toward developing the required CNG infrastructure to accommodate its growing NGV fleet, as well as those of participating commercial and private fleet owners. The City of Long Beach is committed to promoting NGVs within its own fleet, as well as encouraging NGV use by commercial and private fleet owners and resolving market development barriers. The NGV Business Plan provides recommendations for priority locations, station size and design, capital investment, partnership and pricing options. The NGV Business Plan also includes an econometric model to calculate CNG infrastructure cost recovery options, based on CNG market research within the City of Long Beach and Southern California area. Furthermore, the NGV Business Plan provides the City with a guide regarding CNG infrastructure investment, partnerships and private fueling programs. Although the NGV Business Plan was developed to address the prevailing CNG-related issues affecting the City of Long Beach, the methodology used within the NGV Business Plan and, more significantly, the accompanying econometric model will assist local governments, nation-wide, in the successful implementation of similar CNG infrastructures required for effective market penetration of NGVs.

  17. Fracture mechanics analysis of NGV fuel cylinders. Part 2. Metal cylinder liners. Topical report

    SciTech Connect (OSTI)

    Connolly, M.P.; Hudak, S.J.

    1994-03-01

    Metal-lined composite wrapped cylinders for compressed natural gas (CNG) storage onboard natural gas vehicles (NGV`s) offer the advantage of reduced weight over conventional all-metal cylinders. These cylinders, however, can fail as a result of fatigue crack growth in the metal liners, or by degradation and failure of the composite wrap. This report summarizes a fracture mechanics based assessment of fatigue crack growth of the metal liners. The analysis was performed on a full-wrapped aluminum lined cylinder and a hoop-wrapped steel cylinder.

  18. Coating systems for NGV composite cylinders. Final report, May 1994

    SciTech Connect (OSTI)

    Blazek, C.; Chao, S.; Crippen, K.; Janos, A.; Arnold, C.

    1994-09-01

    The report documents an investigation of acid-resistant coating systems that can be applied to composite storage cylinders used on natural gas vehicles. Two recent tank failures were likely caused by stress corrosion cracking of the composite overwrap. Cracking was probably induced by acidic compounds (battery acid) in direct contact with the cylinder's fiber reinforced plastic overwrap. A literature search, discussions with cylinder manufacturers, and laboratory materials studies were performed to identify potential coatings. This investigation also identified relevant test procedures for environmental and materials evaluations.

  19. Assessment of gas engine drives for CNG compressors at NGV fueling stations. Final technical report, June 1993-April 1995

    SciTech Connect (OSTI)

    Keder, J.; Darrow, K.G.

    1995-06-01

    This report assesses the technical and economic issues associated with the use of gas engine drives for gas compressors at natural gas vehicle (NGV) fueling stations. The use of gas engine drives and electric motor drives is compared for typical time fill, fast fill, and combined fill applications. NGV fueling station equipment is described with an emphasis on gas engine and electric motor drives, their installation, operation, and maintenance. The economic benefits of gas engine drives and electric motor drives are compared using sensitivity and operating cost analyses. A perspective of the current market for gas engine drives is also presented, as well as several case histories.

  20. Field study of composite NGV fuel cylinders. Final report, May-September 1994

    SciTech Connect (OSTI)

    Connolly, M.P.; Hanley, J.J.; Aaron, V.D.

    1994-09-01

    The objective of the study was to survey composite compressed natural gas (CNG) cylinders in natural gas vehicle (NGV) service. A total of 56 hoop and full-wrapped composite cylinders that had been in service for periods up to 11 years were tested with acoustic emission (AE) and were subsequently pressurized to failure. The burst pressure was then compared to the burst pressure of a new cylinder in order to quantify any degradation that may have occurred in service. The test results showed that the cylinder data can be divided into two populations; the majority (54 out of 56) of the cylinders tested experienced little degradation in burst pressure over 11 years. However, two of the cylinders tested exhibited a large loss in the burst pressure. These low burst pressures were due to stress corrosion cracking of the E-glass.

  1. Combatting urban air pollution through Natural Gas Vehicle (NGV) analysis, testing, and demonstration

    SciTech Connect (OSTI)

    NONE

    1995-03-01

    Deteriorating urban air quality ranks as a top concern worldwide, since air pollution adversely affects both public health and the environment. The outlook for improving air quality in the world`s megacities need not be bleak, however, The use of natural gas as a transportation fuel can measurably reduce urban pollution levels, mitigating chronic threats to health and the environment. Besides being clean burning, natural gas vehicles (NGVs) are economical to operate and maintain. The current cost of natural gas is lower than that of gasoline. Natural gas also reduces the vehicle`s engine wear and noise level, extends engine life, and decreases engine maintenance. Today, about 700,000 NGVs operate worldwide, the majority of them converted from gasoline or diesel fuel. This article discusses the economic, regulatory and technological issues of concern to the NGV industry.

  2. Natural gas vehicles - market potential

    SciTech Connect (OSTI)

    Not Available

    1984-04-27

    Proponents of natural-gas fueled vehicles (NGVs) claim that the economic, environmental, and performance advantages have a potential market, particularly for large fleets. They also concede that obstacles in the form of price uncertainties, the lack of financial incentives, a weak service infrastructure, state and local taxes and regulations, the high cost of natural gas pumps, and competition from other fuel alternatives are major impediments. Gas utilities must promote the NGV market and the federal government must develop safety and environmental standards before the NGV industry can hope to develop a significant market. 6 references.

  3. Development and validation of a prototype acoustic emission system for inspection of metal NGV fuel cylinders. Topical report, May 1995

    SciTech Connect (OSTI)

    Hudak, S.J.; Connolly, M.P.; Hanley, J.J.; Lukezich, S.J.

    1995-05-01

    Steel cyclinders currently provide the most common form of compressed natural gas (CNG) fuel storage in natural gas vehicles (NGVs). Although presently no federal or state regulations apply specifically to periodic recertification of NGV fuel cylinders fleet operators often use periodic hydrostatic testing to recertify cylinders according to DOT Specification 3AA. Current hydrostatic testing has both economic and technical limitations. In addition to the cost associated with having to remove cyclinders from the vehicles for testing, it has also been shown that current hydrostatic testing is not capable of detecting cracking due to corrosion fatigue-the most critical form of damage in steel NGV fuel cylinders. These economic and technical incentives motivated the present program whose goal was to provide the technical basis for an improved method of recertifying cylinders on-board vehicles.

  4. Experimental investigation of natural gas moisture content and NGV regulator performance. Topical report, October 1993-April 1996

    SciTech Connect (OSTI)

    Rowley, P.F.; Hunecke, D.E.; Maniquis, V.T.; Blazek, C.F.

    1996-05-01

    High moisture levels in natural gas can result in operational problems on-board natural gas vehicle (NGVs) or at fueling stations. Since some NGV stations have experienced higher than recommended moisture levels, NGV equipment must be able to tolerate a reasonable level of moisture. At the pressure regulator on-board the vehicle, gas is expanded from the storage pressure (up to 3600 psig) to the pressure of the fuel delivery system (typically 100 psig). This gas expansion produces significant temperature decreases ranging 100 deg F to 150 deg F. At these low temperatures, water in the gas may drop out and form water droplets, frost or hydrates, which can obstruct on-board components. Experimental testing was conducted at IGT to evaluate the performance of four commercially available NGV regulators (MECO, ITT Conoflow, MESA, and GFI) at extreme temperatures and gas moisture levels. Specific objectives of this project were to identify moisture levels which interfere with operation of these components and to identify component features or designs which are most resistant to high moisture levels.

  5. Control of corrosion-fatigue in NGV fuel cylinders. Topical report, January 1987-August 1989

    SciTech Connect (OSTI)

    Hudak, S.J.; Birring, A.S.; Bartlett, M.L.; Hanley, J.J.

    1990-02-01

    Natural gas vehicle (NGV) fuel cylinders are periodically recertified using hydrostatic testing. However, the procedure is costly, and of questionable value for the detection of corrosion-fatigue cracking, the most serious form of cylinder degradation. The present program examines the feasibility of an improved recertification procedure based on in-service acoustic emissions (AE) monitoring of cracks during cylinder refueling, combined with fracture mechanics testing and analysis to determine the optimum inspection period, the level of detectability required, and the cylinder retirement criteria. Laboratory experiments were used to measure the corrosion-fatigue and fracture resistance of several cylinder steels, as well as to provide basic information on AE sources. A comparison of the latter information with the background noise obtained during cylinder refueling was used to demonstrate the feasibility of the AE procedure. An analytical fracture mechanics model for corrosion-fatigue crack growth in the cylinders was also developed and used, together with the measured materials' properties, to predict cylinder life as a function of crack size, operating pressure, and environment. Conditions for leak-before-break of the cylinder were also examined. Areas requiring additional work are defined, including the important task of determining the minimum AE-detectable crack size in actual cylinders.

  6. Acoustic emission testing of steel-lined FRP hoop-wrapped NGV cylinders

    SciTech Connect (OSTI)

    Akhtar, A.; Kung, D.

    1999-07-01

    Acoustic emissions (AE) were examined from ten steel-lined cylinders, hoop-wrapped with continuous glass fiber reinforced plastic (FRP), after 4 years in natural gas vehicle (NGV) service. A test pressure of 27.6 MPa (1,000 psi) was used which is 7% above the standard specified factor of 1.25 of the nominal service pressure. Hydraulic pressure cycling was applied in the range of 2.4--24.1 MPa (350--3,500 psi) to simulate refueling in the laboratory. Burst pressure was measured for vessels containing no detectable flaw, with flaws in the FRP and cracks in the metallic liner. It was found that visual examination has shortcomings for the inspection of hoop-wrapped cylinders. AE data obtained through incremental pressurization to 27.6 MPa (4,000 psi), holding pressure for 5 minutes, and unloading, do not provide useful information on structural integrity. Relative emission during two consecutive pressurization cycles holds promise for the nondestructive evaluation of metal lined FRP hoop-wrapped cylinders.

  7. Assessment of design and durability issues for composite NGV fuel cylinders. Final topical report, October 1991-February 1994

    SciTech Connect (OSTI)

    Connolly, M.P.; Hudak, S.J.; Grant, T.S.; Roy, S.; Parr, C.H.

    1994-03-01

    Research on advanced compressed natural gas (CNG) cylinders, consisting of a composite overwrap and a metallic or nonmetallic liner, is reviewed. Specific conclusions from the review are that these cylinders are unlikely to fail in the short term, but failure, if it does occur, is more likely to result from progressive degradation over time, which may occur as a result of liner or overwrap failure. Analytical models to predict cylinder failure are reviewed. NDE and smart-structure concepts for CNG cylinders are also considered and ultrasonic and acoustic emission techniques are shown to be most promising. A conclusion from the review is that the desired 15-year life for CNG cylinders for NGVs, proposed in the NGV-2 standard, is achievable but is predicted on the trade-off between inspection at manufacture, in-service inspection, or extensive design and manufacture that ensures no premature cylinder failures.

  8. 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)

    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)

    2009-07-28

    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.

  9. HD 52452: New BVRI Photometry

    E-Print Network [OSTI]

    Sudhanshu Barway; S. K. Pandey

    2004-08-19

    In this paper we report the multi-band BVRI photometry of HD 52452. The comparison of our data with previous observations reported by Messina et al. (2001) shows that there is a variation in amplitude, but the phases of the two minima, thus the positions of the spot, are quite stable during our observations.

  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. Field data on testing of natural gas vehicle (NGV) containers using proposed ASTM standard test method for examination of gas-filled filament-wound pressure vessels using acoustic emission (ASTM-E070403-95/1)

    SciTech Connect (OSTI)

    Fultineer, R.D. Jr.; Mitchell, J.R.

    1999-07-01

    There are many composite wrapped pressure vessels in service. These containers are most widely used for gas storage in natural gas vehicles (NGV). A standard has been developed for the testing of these vessels by the subcommittee ASTM E07.04.03 Acoustic Emission (AE) applications. The AE test method is supported by both field test data and laboratory destructive testing. The test method describes a global volumetric testing technique which is offered as an alternative to the current practice of visual inspection.

  13. Development of an all-composite NGV high pressure storage cylinder. Final report, October 1989-July 1991

    SciTech Connect (OSTI)

    Johnson, W.K.; Winegar, J.S.

    1991-08-01

    The development of an all-composite cylinder for high pressure storage of natural gas on a vehicle was aimed at eliminating the major barrier to widespread use of natural gas as a vehicle fuel--the limited capacity, excessive weight and high cost of presently available cylinders. The research project demonstrated: (1) the feasibility of structurally containing high pressure (3,000 psi) natural gas through the composite overwrap alone without the use of a metallic liner, (2) a potential approach to the pole piece design and pole piece to liner interface, and (3) the unsuitability of a welded plastic laminate for a liner.

  14. Asteroseismic Study of the Subgiant HD 82074

    E-Print Network [OSTI]

    Villar, Victoria Ashley

    2014-01-01

    This thesis analyzes HD 82074, a solar-mass and low-metallicity subgiant star, using ground-based asteroseismology with the CHIRON spectrometer at the Cerro Tololo Inter-American Observatory (CTIO) and interferometry with ...

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

    E-Print Network [OSTI]

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

    2007-07-13

    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 few tens of G, is significantly more complex than that of the Sun; it involves in particular a significant toroidal component and contributions from magnetic multipoles of order up to 5. The CaII H & K lines clearly feature core emission, whose intensity is apparently varying mostly with rotation phase. Our data suggest that the photosphere and magnetic field of HD 189733 are sheared by a significant amount of differential rotation. Our initial study confirms that HD 189733 is an optimal target for investigating activity enhancements induced by closely orbiting planets. More data are needed, densely covering both the orbital and rotation cycles, to investigate whether and how much the planet contributes to the overall activity level of HD 189733.

  16. Collision-energy dependence of HD,, =1,j ... product rotational distributions for the H+D2 reaction

    E-Print Network [OSTI]

    Zare, Richard N.

    Collision-energy dependence of HD,, =1,j ... product rotational distributions for the H+D2 reactionV because interesting effects might depend on the energy provided, as the example of the HD =3, j product Received 20 April 2005; accepted 31 May 2005; published online 8 August 2005 Product rotational

  17. THE VISUAL ORBITS OF THE SPECTROSCOPIC BINARIES HD 6118 AND HD 27483 FROM THE PALOMAR TESTBED INTERFEROMETER

    E-Print Network [OSTI]

    THE VISUAL ORBITS OF THE SPECTROSCOPIC BINARIES HD 6118 AND HD 27483 FROM THE PALOMAR TESTBED, taken with the Palomar Testbed Interferometer (PTI) in the K band. HD 6118 is one of the most eccentric interfer- ometers (for a review see Quirrenbach 2001). The Palomar Testbed Interferometer (PTI) itself has

  18. Potential

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

    Potential and Frictional Drag on a Floating Sphere in a Flowing Plasma I. H. Hutchinson Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, MA, USA...

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

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

    Pickup Truck with a Combined Supercharger and Turbocharger Boosting System to Improve Drive Cycle Fuel Economy Design and Development of e-Turbo for SUV and Light Truck...

  20. 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]

    Zare, Richard N.

    Collision energy dependence of the HD,, Ä2... 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

  1. HERSCHEL-RESOLVED OUTER BELTS OF TWO-BELT DEBRIS DISKS AROUND A-TYPE STARS: HD 70313, HD 71722, HD 159492, AND F-TYPE: HD 104860

    SciTech Connect (OSTI)

    Morales, F. Y.; Bryden, G.; Werner, M. W. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States); Stapelfeldt, K. R., E-mail: Farisa@jpl.nasa.gov [NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics Laboratory, Code 667, Greenbelt, MD 20771 (United States)

    2013-10-20

    We present dual-band Herschel/Photodetector Array Camera and Spectrometer imaging for four stars whose spectral energy distributions (SEDs) suggest two-ring disk architectures that mirror that of the asteroid-Kuiper Belt geometry of our own solar system. The Herschel observations at 100 ?m spatially resolve the cold/outer-dust component for each star-disk system for the first time, finding evidence of planetesimals at >100 AU, i.e., a larger size than assumed from a simple blackbody fit to the SED. By breaking the degeneracy between the grain properties and the dust's radial location, the resolved images help constrain the dust grain-size distribution for each system. Three of the observed stars are A-type and one solar-type. On the basis of the combined Spitzer/IRS+MIPS (5-70 ?m), the Herschel/PACS (100 and 160 ?m) dataset, and under the assumption of idealized spherical grains, we find that the cold/outer belts of the three A-type stars are well fit with a mixed ice/rock composition rather than pure rocky grains, while the debris around the solar-type star is consistent with either rock or ice/rock grains. For the solar-type star HD 104860, we find that the minimum grain size is larger than expected from the threshold set by radiative blowout. The A-type stars HD 71722 and HD 159492, on the other hand, require minimum grain sizes that are smaller than blowout for inner- and outer-ring populations. In the absence of spectral features for ice, we find that the behavior of the continuum can help constrain the composition of the grains (of icy nature and not pure rocky material) given the Herschel-resolved locations of the cold/outer-dust belts.

  2. Performance analysis of HD1: a 16 Tesla Nb3Sn dipole Magnet

    E-Print Network [OSTI]

    Mattafirri, S.

    2009-01-01

    Analysis of HD1: A 16 Tesla Nb 3 Sn Dipole Magnet S.of HD1b, an Upgraded 16 Tesla Nb 3 Sn Dipole Magnet”, This

  3. HD gas analysis with Gas Chromatography and Quadrupole Mass Spectrometer

    E-Print Network [OSTI]

    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

    2011-01-28

    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.

  4. Characterizing the Rigidly Rotating Magnetosphere Stars HD 345439 and HD 23478

    E-Print Network [OSTI]

    Wisniewski, J P; Davenport, J R A; Bartz, J; Pepper, J; Whelan, D G; Eikenberry, S S; Lomax, J R; Majewski, S R; Richardson, N D; Skrutskie, M

    2015-01-01

    The SDSS III APOGEE survey recently identified two new $\\sigma$ Ori E type candidates, HD 345439 and HD 23478, which are a rare subset of rapidly rotating massive stars whose large (kGauss) magnetic fields confine circumstellar material around these systems. Our analysis of multi-epoch photometric observations of HD 345439 from the KELT, SuperWASP, and ASAS surveys reveals the presence of a $\\sim$0.7701 day period in each dataset, suggesting the system is amongst the faster known $\\sigma$ Ori E analogs. We also see clear evidence that the strength of H-alpha, H I Brackett series lines, and He I lines also vary on a $\\sim$0.7701 day period from our analysis of multi-epoch, multi-wavelength spectroscopic monitoring of the system from the APO 3.5m telescope. We trace the evolution of select emission line profiles in the system, and observe coherent line profile variability in both optical and infrared H I lines, as expected for rigidly rotating magnetosphere stars. We also analyze the evolution of the H I Br-11 ...

  5. HD 80606: Searching the chemical signature of planet formation

    E-Print Network [OSTI]

    Saffe, C; Buccino, A

    2015-01-01

    (Abridged) Binary systems with similar components are ideal laboratories which allow several physical processes to be tested, such as the possible chemical pattern imprinted by the planet formation process. Aims. We explore the probable chemical signature of planet formation in the remarkable binary system HD 80606 - HD 80607. The star HD 80606 hosts a giant planet with 4 MJup detected by both transit and radial velocity techniques, being one of the most eccentric planets detected to date. We study condensation temperature Tc trends of volatile and refractory element abundances to determine whether there is a depletion of refractories that could be related to the terrestrial planet formation. Methods. We carried out a high-precision abundance determination in both components of the binary system, using a line-by-line strictly differential approach, using the Sun as a reference and then using HD 80606 as reference. We used an updated version of the program FUNDPAR, together with ATLAS9 model atmospheres and th...

  6. RADIO OBSERVATIONS OF HD 80606 NEAR PLANETARY PERIASTRON

    SciTech Connect (OSTI)

    Lazio, T. Joseph W.; Farrell, W. M.; Shankland, P. D.; Blank, D. L.

    2010-12-15

    This paper reports Very Large Array observations at 325 and 1425 MHz ({lambda}90 cm and {lambda}20 cm) during and near the periastron passage of HD 80606b on HJD 2454424.86 (2007 November 20). We obtain flux density limits (3{sigma}) of 1.7 mJy and 48 {mu}Jy at 325 and 1425 MHz, respectively, equivalent to planetary luminosity limits of 2.3 x 10{sup 24} erg s{sup -1} and 2.7 x 10{sup 23} erg s{sup -1}. Unfortunately, these are several orders of magnitude above the nominal Jovian value (at 40 MHz) of 2 x 10{sup 18} erg s{sup -1}. The motivation for these observations was that the planetary magnetospheric emission is driven by a stellar wind-planetary magnetosphere interaction so that the planetary luminosity would be elevated near periastron. We estimate that, near periastron, HD 80606b might be as much as 3000 times more luminous than Jupiter. Recent transit observations of HD 80606b provide reasonably stringent constraints on the planetary mass and radius, and, because of the planet's highly eccentric orbit, its rotation period is likely to be 'pseudo-synchronized' to its orbital period, allowing a robust estimate of the former. Consequently, we are able to make relatively robust estimates of the emission frequency of the planetary magnetospheric emission and find it to be around 60-90 MHz. While this is too low for our reported observations, we compare HD 80606b to other high-eccentricity systems and assess the detection possibilities for both near-term and more distant future systems. Of the known high-eccentricity planets, only HD 80606b is likely to be detectable, as the others (HD 20782B and HD 4113) are both lower mass and longer rotational periods, which imply weaker magnetic field strengths. We find that both the forthcoming 'EVLA low band' system, which will operate as low as 65 MHz, and the Low Frequency Array may be able to improve upon our planetary luminosity limits for HD 80606b, and do so at a more optimum frequency. If the low-frequency component of the Square Kilometre Array (SKA-lo) and a future lunar radio array are able to approach their thermal noise limits, they should be able to detect an HD 80606b-like planet, unless the amount by which the planet's luminosity increases is substantially less than the factor of 3000 that we estimate; for the SKA-lo, which is to be located in the southern hemisphere, future planetary surveys will have to find southern hemisphere equivalents of HD 80606b.

  7. The 4.5 ?m full-orbit phase curve of the hot Jupiter HD 209458b

    SciTech Connect (OSTI)

    Zellem, Robert T.; Griffith, Caitlin A.; Showman, Adam P.; Lewis, Nikole K.; Knutson, Heather A.; Fortney, Jonathan J.; Laughlin, Gregory; Cowan, Nicolas B.; Agol, Eric; Burrows, Adam; Charbonneau, David; Deming, Drake; Langton, Jonathan

    2014-07-20

    The hot Jupiter HD 209458b is particularly amenable to detailed study as it is among the brightest transiting exoplanet systems currently known (V-mag = 7.65; K-mag = 6.308) and has a large planet-to-star contrast ratio. HD 209458b is predicted to be in synchronous rotation about its host star with a hot spot that is shifted eastward of the substellar point by superrotating equatorial winds. Here we present the first full-orbit observations of HD 209458b, in which its 4.5 ?m emission was recorded with Spitzer/IRAC. Our study revises the previous 4.5 ?m measurement of HD 209458b's secondary eclipse emission downward by ?35% to 0.1391%{sub ?0.0069%}{sup +0.0072%}, changing our interpretation of the properties of its dayside atmosphere. We find that the hot spot on the planet's dayside is shifted eastward of the substellar point by 40.°9 ± 6.°0, in agreement with circulation models predicting equatorial superrotation. HD 209458b's dayside (T{sub bright} = 1499 ± 15 K) and nightside (T{sub bright} = 972 ± 44 K) emission indicate a day-to-night brightness temperature contrast smaller than that observed for more highly irradiated exoplanets, suggesting that the day-to-night temperature contrast may be partially a function of the incident stellar radiation. The observed phase curve shape deviates modestly from global circulation model predictions potentially due to disequilibrium chemistry or deficiencies in the current hot CH{sub 4} line lists used in these models. Observations of the phase curve at additional wavelengths are needed in order to determine the possible presence and spatial extent of a dayside temperature inversion, as well as to improve our overall understanding of this planet's atmospheric circulation.

  8. HD 112914 : A nearby one solar mass binary system

    E-Print Network [OSTI]

    Henri M. J. Boffin; Dimitri Pourbaix

    2003-02-24

    In paper 167 of his serie published in The Observatory, Griffin presented the spectroscopic orbit of HD 112914, a late main sequence star. He also noticed that this star, also known as HIP 63406, was one of the few for which the DMSA/O Annex of the Hipparcos Catalogue derived an orbit prior to any spectroscopic one. Albeit in agreement with each others, the astrometric orbit was however determined with rather large uncertainties. Here, we have reanalysed the Hipparcos Intermediate Astrometric Data (IAD) using Griffin'spectroscopic orbit to obtain a much more precise astrometric orbit. Several parameters of the HD 112914 system are now well constrained.

  9. HD 112914 A nearby one solar mass binary system

    E-Print Network [OSTI]

    Boffin, H M J; Boffin, Henri M.J.; Pourbaix, Dimitri

    2003-01-01

    In paper 167 of his serie published in The Observatory, Griffin presented the spectroscopic orbit of HD 112914, a late main sequence star. He also noticed that this star, also known as HIP 63406, was one of the few for which the DMSA/O Annex of the Hipparcos Catalogue derived an orbit prior to any spectroscopic one. Albeit in agreement with each others, the astrometric orbit was however determined with rather large uncertainties. Here, we have reanalysed the Hipparcos Intermediate Astrometric Data (IAD) using Griffin'spectroscopic orbit to obtain a much more precise astrometric orbit. Several parameters of the HD 112914 system are now well constrained.

  10. THE DUST RING OF LUMINOUS BLUE VARIABLE CANDIDATE HD 168625: INFRARED OBSERVATIONS AND MODEL CALCULATIONS1

    E-Print Network [OSTI]

    Speck, Angela Karen

    THE DUST RING OF LUMINOUS BLUE VARIABLE CANDIDATE HD 168625: INFRARED OBSERVATIONS AND MODEL surrounding the luminous blue variable (LBV) candidate HD 168625, together with new temperature and optical energy distribution of the dust. Therefore, HD 168625 is an excellent example of proposed models of LBV

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

    E-Print Network [OSTI]

    Cai, Long

    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

  12. Technological advancements in NGV station design

    SciTech Connect (OSTI)

    Ledbetter, G.S.; Grimmer, J.E.; Ketcham, E.T.

    1995-12-31

    Hurricane Compressors` SPRINT System (patent pending) is designed to increase the rate of flow from compressed natural gas (CNG) fuel stations and provide greater utilization of stored CNG than is available from traditional compressor stations. Using a novel method of adapting compressor operation to changes in CNG storage system pressures, this advanced technology provides an alternative mechanism for fuel delivery when demand for fuel is high. Transfer of CNG may be made at higher rates of flow than would be possible either from a pressure depleted storage system or directly from the compressor.

  13. 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]

    Angenent, Lars T.

    Library has a SONY GV-HD700 Digital HD Video Cassette Deck. It is attached to the left side Mac Pro Creation Station, and can be used to "capture", or convert video from miniDV tapes to digital files. 1

  14. The chemical abundances of the Ap star HD94660

    SciTech Connect (OSTI)

    Giarrusso, M. [Università 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)

    2014-05-09

    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.

  15. HD 98618: A Star Closely Resembling our Sun

    E-Print Network [OSTI]

    Jorge Melendez; Katie Dodds-Eden; Jose A. Robles; ;; RSAA/Mt Stromlo Observatory; Caltech; UNMSM

    2006-04-07

    Despite the observational effort carried out in the last few decades, no perfect solar twin has been found to date. An important milestone was achieved a decade ago by Porto de Mello & da Silva, who showed that 18 Sco is almost a solar twin. In the present work, we use extremely high resolution (R = 10^5) high S/N Keck HIRES spectra to carry out a differential analysis of 16 solar twin candidates. We show that HD 98618 is the second-closest solar twin and that the fundamental parameters of both HD 98618 and 18 Sco are very similar (within a few percent) to the host star of our solar system, including the likelihood of hosting a terrestrial planet within their habitable zone. We suggest that these stars should be given top priority in exoplanet and SETI surveys.

  16. Spatially resolved eastward winds and rotation of HD$\\,$189733b

    E-Print Network [OSTI]

    Louden, Tom

    2015-01-01

    We measure wind velocities on opposite sides of the hot Jupiter HD$\\,$189733b by modeling sodium absorption in high-resolution HARPS transmission spectra. Our model implicitly accounts for the Rossiter-McLaughlin effect, which we show can explain the high wind velocities suggested by previous studies. Our results reveal a strong eastward motion of the atmosphere of HD$\\,$189733b, with a redshift of $2.3^{+1.3}_{-1.5}\\,$km$\\,$s$^{-1}$ on the leading limb of the planet and a blueshift of $5.3^{+1.0}_{-1.4}\\,$km$\\,$s$^{-1}$ on the trailing limb. These velocities can be understood as a combination of tidally locked planetary rotation and an eastward equatorial jet; closely matching the predictions of atmospheric circulation models. Our results show that the sodium absorption of HD$\\,$189733b is intrinsically velocity broadened and so previous studies of the average transmission spectrum are likely to have overestimated the role of pressure broadening.

  17. POTENTIALLY H-BIGRAPHIC SEQUENCES MICHAEL FERRARA

    E-Print Network [OSTI]

    Siggers, Mark H.

    , v} X, (or {u, v} Y ,) u V (H), v V (H), and degG(u) degG(v). Let T = NH(v) \\ NG(u, v) be the neighbors of v in H that are not neighbors of u. Since |NG(u)| |NG(v)|, we have that |NG(u) \\ NG(u, v)| |NG(v) \\ NG(u, v)| |T |, thus there exists subset T of NG(u) \\ NG(u, v) of size |T |. Let G = G (X

  18. Confirming HD 23478 as a new magnetic B star hosting an H$\\alpha$-bright centrifugal magnetosphere

    E-Print Network [OSTI]

    Sikora, James; Bohlender, David; Neiner, Coralie; Oksala, Mary; Shultz, Matt; Cohen, David; ud-Doula, Asif; Grunhut, Jason; Monin, Dmitry; Owocki, Stan; Petit, Véronique; Rivinius, Thomas; Townsend, Richard

    2015-01-01

    In this paper we report 23 magnetic field measurements of the B3IV star HD 23478: 12 obtained from high resolution Stokes $V$ spectra using the ESPaDOnS (CFHT) and Narval (TBL) spectropolarimeters, and 11 from medium resolution Stokes $V$ spectra obtained with the DimaPol spectropolarimeter (DAO). HD 23478 was one of two rapidly rotating stars identified as potential "centrifugal magnetosphere" hosts based on IR observations from the Apache Point Observatory Galactic Evolution Experiment survey. We derive basic physical properties of this star including its mass ($M=6.1^{+0.8}_{-0.7}\\,M_\\odot$), effective temperature ($T_{\\rm eff}=20\\pm2\\,$kK), radius ($R=2.7^{+1.6}_{-0.9}\\,R_\\odot$), and age ($\\tau_{\\rm age}=3^{+37}_{-1}\\,$Myr). We repeatedly detect weakly-variable Zeeman signatures in metal, He and H lines in all our observations corresponding to a longitudinal magnetic field of $\\langle B_z\\rangle\\approx-2.0\\,$kG. The rotational period is inferred from Hipparcos photometry ($P_{\\rm rot}=1.0498(4)\\,$d). Und...

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

    E-Print Network [OSTI]

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

    2007-01-01

    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 s...

  20. NEAR-INFRARED TRANSIT PHOTOMETRY OF THE EXOPLANET HD 149026b

    E-Print Network [OSTI]

    Carter, Joshua Adam

    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 ...

  1. Modelling the local and global cloud formation on HD 189733b

    E-Print Network [OSTI]

    Lee, G; Dobbs-Dixon, I; Juncher, D

    2015-01-01

    Context. Observations suggest that exoplanets such as HD 189733b form clouds in their atmospheres which have a strong feedback onto their thermodynamical and chemical structure, and overall appearance. Aims. Inspired by mineral cloud modelling efforts for Brown Dwarf atmospheres, we present the first spatially varying kinetic cloud model structures for HD 189733b. Methods. We apply a 2-model approach using results from a 3D global radiation-hydrodynamic simulation of the atmosphere as input for a detailed, kinetic cloud formation model. Sampling the 3D global atmosphere structure with 1D trajectories allows us to model the spatially varying cloud structure on HD 189733b. The resulting cloud properties enable the calculation of the scattering and absorption properties of the clouds. Results. We present local and global cloud structure and property maps for HD 189733b. The calculated cloud properties show variations in composition, size and number density of cloud particles which are strongest between the daysi...

  2. Daily HD TV News: Helping to Turn You On | Home | News | Blog | Reviews |

    E-Print Network [OSTI]

    Rogers, John A.

    Search Daily HD TV News: Helping to Turn You On | Home | News | Blog | Reviews | Sunday 30th of August 2009 Main: Home· HDTV News· HDTV Blog· HDTV Reviews· HDTV Categories: General HDTV· HDTV Receivers

  3. Test Results for HD1, a 16 Tesla Nb3Sn Dipole Magnet

    E-Print Network [OSTI]

    Lietzke, A.F.

    2011-01-01

    Design and Fabrication ofa 16 Tesla Nb 3 Sn Dipole Magnet",Test Results for HD 1, a 16 Tesla Nb 3 Sn Dipole Magnet A.F.and bore fields above 16 Tesla. II. MAGNET FEATURES AND TEST

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

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

    HD Engine for Class 8 Truck Applications This poster offers a comparison of high-pressure direct injection (HPDI) of natural gas engines with pilot diesel ignition with diesel...

  5. Conformational Analysis of Disordered Proteins Using H/D Exchange Mass Spectrometry

    E-Print Network [OSTI]

    Keppel, Theodore Robert

    2013-05-31

    .3.1 Optimizing Mixer Design under Laminar Flow Conditions ......................... 115 4.3.2 Validation of Quench-Flow Labeling ........................................................... 119 4.3.3 Rapid H/D Exchange by Intact CBP... ..................................................................................... 103 Figure 3.5: Structure of ACTR/CBP complex showing increase in protection ................... 104 Figure 3.6: Conceptual representation of H/D exchange flux model ................................. 106 Figure 4.1: The quench-flow apparatus...

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

    E-Print Network [OSTI]

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

    2015-01-01

    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...

  7. The stellar wind velocity field of HD 77581

    E-Print Network [OSTI]

    Manousakis, A

    2015-01-01

    The early acceleration of stellar winds in massive stars is poorly constrained. The scattering of hard X-ray photons emitted by the pulsar in the high-mass X-ray binary Vela X-1 can be used to probe the stellar wind velocity and density profile close to the surface of its supergiant companion HD 77581. We built a high signal-to-noise and high resolution hard X-ray lightcurve of Vela X-1 measured by Swift/BAT over 300 orbital periods of the system and compared it with the predictions of a grid of hydrodynamic simulations. We obtain a very good agreement between observations and simulations for a narrow set of parameters, implying that the wind velocity close to the stellar surface is twice larger than usually assumed with the standard beta law. Locally a velocity gradient of $\\beta\\sim0.5$ is favoured. Even if still incomplete, hydrodynamic simulations are successfully reproducing several observational properties of Vela X-1.

  8. The HD 5980 multiple system: Masses and evolutionary status

    SciTech Connect (OSTI)

    Koenigsberger, Gloria [Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Ave. Universidad S/N, Cuernavaca, Morelos 62210 (Mexico); Morrell, Nidia [Las Campanas Observatory, The Carnegie Observatories, Colina El Pino s/n, Casillas 601, La Serena (Chile); Hillier, D. John [Department of Physics and Astronomy, and Pittsburgh Particle Physics, Astrophysics and Cosmology Center (PITT PACC), 3941 O'Hara Street, University of Pittsburgh, Pittsburgh, PA 15260 (United States); Gamen, Roberto [Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, and Instituto de Astrofísica de La Plata (CCT La Plata-CONICET), Paseo del Bosque S/N, B1900FWA La Plata (Argentina); Schneider, Fabian R. N.; González-Jiménez, Nicolás; Langer, Norbert [Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121 Bonn (Germany); Barbá, Rodolfo, E-mail: gloria@astro.unam.mx, E-mail: nmorrell@lco.edu, E-mail: hillier@pitt.edu, E-mail: rgamen@fcaglp.unlp.edu.ar, E-mail: fschneid@astro.uni-bonn.de, E-mail: ngonzalez@astro.uni-bonn.de, E-mail: nlanger@astro.uni-bonn.de, E-mail: rbarba@dfuls.cl [Departamento de Física, Av. Juan Cisternas 1200 Norte, Universidad de la Serena, La Serena (Chile)

    2014-10-01

    New spectroscopic observations of the LBV/WR multiple system HD 5980 in the Small Magellanic Cloud are used to address the question of the masses and evolutionary status of the two very luminous stars in the 19.3 day eclipsing binary system. Two distinct components of the N V 4944 Å line are detected in emission and their radial velocity variations are used to derive masses of 61 and 66 M {sub ?}, under the assumption that binary interaction effects on this atomic transition are negligible. We propose that this binary system is the product of quasi-chemically homogeneous evolution with little or no mass transfer. Thus, both of these binary stars may be candidates for gamma-ray burst progenitors or even pair instability supernovae. Analysis of the photospheric absorption lines belonging to the third-light object in the system confirm that it consists of an O-type star in a 96.56 day eccentric orbit (e = 0.82) around an unseen companion. The 5:1 period ratio and high eccentricities of the two binaries suggest that they may constitute a hierarchical quadruple system.

  9. HD 209458 and the Power of the Dark Side

    E-Print Network [OSTI]

    David Charbonneau

    2002-09-24

    The rich wealth of observational data, and matching theoretical investigations, of the transiting planet of HD209458 stands in sharp contrast to systems for which only the radial velocity orbit is known. In this paper, I summarize the current status of these observations, and motivate a variety of projects that should be accessible with existing instruments. I describe observational estimates of the planetary radius, and discuss the relevant sources of uncertainty. I compare these estimates to those based on theoretical structural models. This discussion motivates the observational pursuit of three quantities that could be derived from measurements of the secondary eclipse: These are the albedo, the temperature, and the orbital eccentricity. I review the recent detection of the sodium D lines in the planetary atmosphere, and discuss ongoing work to search for molecular features in the near infrared. I also outline the use of the Rossiter effect to study the alignment of the orbit with the stellar equatorial plane, and transit timing to search for additional objects in the system.

  10. Effective potential study of the rotational excitation of HD by collision with H2

    E-Print Network [OSTI]

    Chu, Shih-I

    1975-09-01

    basis sets. The first set includes only (00), (01), and (02) channels while the second one includes all the open channels (00), (01), (02), (20), and (21) at the specific energy E = O. 0555 eV. The inclusion of the two extra higher-lying channels (20... for causing TABLE 1. Comparison of excitation cross sections for differ­ ent basis sets. E=0.0555 eV. Transitions jJ2 -j{j1 00-01 00-02 01-02 (00), (01), (02) 22.86& 1.27 7.22 ·Cross sections are in units of aij. Basis set (00), (01), (02), (20...

  11. Dynamical evolution of titanium, strontium, and yttrium spots on the surface of the HgMn star HD 11753

    E-Print Network [OSTI]

    Briquet, M; Gonzalez, J F; Hubrig, S; Hackman, T

    2010-01-01

    Aims. We gathered about 100 high-resolution spectra of three typical HgMn (mercury-manganese) stars, HD 11753, HD 53244, and HD 221507, to search for slowly pulsating B-like pulsations and surface inhomogeneous distribution of various chemical elements. Methods. Classical frequency analysis methods were used to detect line profile variability and to determine the variation period. Doppler imaging reconstruction was performed to obtain abundance maps of chemical elements on the stellar surface. Results. For HD 11753, which is the star with the most pronounced variability, distinct spectral line profile changes were detected for Ti, Sr, Y, Zr, and Hg, whereas for HD 53244 and HD 221507 the most variable line profiles belong to the elements Hg and Y, respectively. We derived rotation periods for all three stars from the variations of radial velocities and equivalent widths of spectral lines belonging to inhomogeneously distributed elements: P_rot (HD 11753)=9.54 d, P_rot (HD 53244)=6.16 d, and P_rot (HD 221507)=...

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

    E-Print Network [OSTI]

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

    2007-10-26

    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.

  13. Does the debris disk around HD 32297 contain cometary grains?

    SciTech Connect (OSTI)

    Rodigas, Timothy J.; Hinz, Philip M.; Bailey, Vanessa; Defrere, Denis; Leisenring, Jarron; Schneider, Glenn; Skemer, Andrew J.; Vaitheeswaran, Vidhya; Debes, John H.; Mamajek, Eric E.; Pecaut, Mark J.; Currie, Thayne; De Rosa, Robert J.; Ward-Duong, Kimberly; Hill, John M.; Skrutskie, Michael

    2014-03-01

    We present an adaptive optics imaging detection of the HD 32297 debris disk at L' (3.8 ?m) obtained with the LBTI/LMIRcam infrared instrument at the Large Binocular Telescope. The disk is detected at signal-to-noise ratio per resolution element ?3-7.5 from ?0.''3 to 1.''1 (30-120 AU). The disk at L' is bowed, as was seen at shorter wavelengths. This likely indicates that the disk is not perfectly edge-on and contains highly forward-scattering grains. Interior to ?50 AU, the surface brightness at L' rises sharply on both sides of the disk, which was also previously seen at Ks band. This evidence together points to the disk containing a second inner component located at ?50 AU. Comparing the color of the outer (50

  14. POTENTIALLY H-BIGRAPHIC SEQUENCES MICHAEL FERRARA, MICHAEL JACOBSON

    E-Print Network [OSTI]

    Schmitt, John R.

    , such that {u, v} X, (or {u, v} Y ,) u V (H), v V (H), and degG(u) degG(v). Let T = NH(v) \\ NG(u, v) be the neighbors of v in H that are not neighbors of u. Since |NG(u)| |NG(v)|, we have that |NG(u) \\ NG(u, v)| |NG(v) \\ NG(u, v)| |T |, thus there exists subset T of NG(u) \\ NG(u, v) of size |T |. Let G = G (X

  15. Cutaneous uptake of 14C-HD vapor by the hairless guinea pig. Technical report, December 1992-June 1993

    SciTech Connect (OSTI)

    Logan, T.P.; Bongiovanni, R.; Millard, C.B.; Shutz, M.B.; Schultz, S.M.

    1996-10-01

    The hairless guinea pig (HGP) is used by our laboratory to model the human cutaneous response to sulfur mustard (HD) exposure. We have determined the HD content in the skin of HOP after 7-minute exposures to vapors saturated with a mixture of HD and 14C-HD. Concentration/time (C1) values in the range of 2 mg/sq cm/min were determined by counting skin 14C disintegrations per minute (dpm) in animals euthanized immediately after exposure. These values are similar to human penetration rates obtained by other investigators. A direct relationship between C1 and relative humidity was demonstrated in 5 of 6 studies. A rate curve monitoring the reduction in skin 14C dpm was developed for animals euthanized between 0 and 24 hours post exposure. This curve showed the greatest change after 1 hour. Epidermal and dermal distribution of 14C at 24 hours was measured for two animals. Site preference for HD penetration, multiple use of a vapor cap containing HD, and 14C content of adhesive tape were also investigated with radiolabeled HD to evaluate other aspects of the experimental model. These results contribute to a better understanding of the cutaneous response to HD in the HGP model.

  16. MAGNETIC FIELD MEASUREMENTS OF HD2, A HIgh Nb3Sn DIPOLE MAGNET

    SciTech Connect (OSTI)

    Wang, X.; Caspi, S.; Cheng, D. W.; Felice, H.; Ferracin, P.; Hafalia, R. R.; Joseph, J. M.; Lietzke, A. F.; Lizarazo, J.; McInturff, A. D.; Sabbi, G. L.; Sasaki, K.

    2009-05-04

    The Superconducting Magnet Program at Lawrence Berkeley National Laboratory has designed and tested HD2, a 1 m long Nb{sub 3}Sn accelerator-type dipole based on a simple block-type coil geometry with flared ends. HD2 represents a step toward the development of cost-effective accelerator quality magnets operating in the range of 13-15 T. The design was optimized to minimize geometric harmonics and to address iron saturation and conductor magnetization effects. Field quality was measured during recent cold tests. The measured harmonics are presented and compared to the design values.

  17. Tunneling chemical exchange reaction $\\textrm{D}+\\textrm{HD}\\rightarrow\\textrm{D}_{2}+\\textrm{H}$ in solid HD at temperatures below 1$\\,$K

    E-Print Network [OSTI]

    Sheludiakov, S; Järvinen, J; Zvezdov, D; Lehtonen, L; Vainio, O; Vasiliev, S; Khmelenko, V V; Lee, D M

    2015-01-01

    We report on a study of the exchange tunneling reaction D+HD$\\rightarrow$D$_{2}$+H in solid HD at temperatures between 130~mK and 1.5~K by electron spin resonance. The reaction proceeds at almost the same rate ($\\sim3\\times10^{-27}$cm$^{3}$s$^{-1}$) within this temperature range. This observation differs strongly with the recombination rate of H atoms in solid H$_{2}$ which was found substantially reduced upon lowering temperature below 1$\\,$K. These results suggest that the tunneling exchange reaction $\\textrm{H}+\\textrm{H}_{2}\\rightarrow\\textrm{H}_{2}+\\textrm{H}$ can take place in solid H$_{2}$ even though recombination is suppressed at ultra low temperatures in pure hydrogen.

  18. UNUSUALLY WEAK DIFFUSE INTERSTELLAR BANDS TOWARD HD 62542 Theodore P. Snow,1

    E-Print Network [OSTI]

    McCall, Benjamin J.

    UNUSUALLY WEAK DIFFUSE INTERSTELLAR BANDS TOWARD HD 62542 Theodore P. Snow,1 Daniel E. Welty,2 approaches were made to the task of identifying the carriers (see Herbig 1995 or Snow 1995, 2001 for recent conclusions (Snow, York, & Welty 1977). With the advent of electronic detec- tors in the 1970s, however

  19. Cooperation in Object Bases through Alliances D. A. Kottmann P. C. Lockemann H.D. Walter

    E-Print Network [OSTI]

    Mannheim, Universität

    Cooperation in Object Bases through Alliances D. A. Kottmann P. C. Lockemann H.­D. Walter Fakult into a new construct called alliances. We show that alliances ease the task of integrating objects into building a co­ operative application, and further, that alliances can also serve to cope

  20. ENERGETIC NEUTRAL ATOMS AROUND HD 209458b: ESTIMATIONS OF MAGNETOSPHERIC PROPERTIES

    SciTech Connect (OSTI)

    Ekenbaeck, A.; Holmstroem, M.; Wurz, P.; Griessmeier, J.-M.; Lammer, H.; Selsis, F.; Penz, T.

    2010-02-01

    HD 209458b is an exoplanet found to transit the disk of its parent star. Observations have shown a broad absorption signature about the Lyalpha stellar line during transit, suggesting the presence of a thick cloud of atomic hydrogen around the 'hot Jupiter' HD 209458b. This work expands on an earlier work studying the production of energetic neutral atoms (ENAs) as a result of the interaction between the stellar wind and the exosphere. We present an improved flow model of HD 209458b and use stellar wind values similar to those in our solar system. We find that the ENA production is high enough to explain the observations, and we show that-using expected values for the stellar wind and exosphere-the spatial and velocity distributions of ENAs would give absorption in good agreement with the observations. We also study how the production of ENAs depends on the exospheric parameters and establish an upper limit for the obstacle standoff distance at approximately 4-10 planetary radii. Finally, we compare the results obtained for the obstacle standoff distance with existing exomagnetospheric models and show how the magnetic moment of HD 209458b can be estimated from ENA observations.

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

    E-Print Network [OSTI]

    Adams, Elisabeth Rose

    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 ...

  2. NGV cylinder workshop 2. Final report, March 1993

    SciTech Connect (OSTI)

    Biederman, R.; Blazek, C.

    1993-06-01

    The report provides an overview of the objectives, conclusions and recommendations discussed during the GRI-sponsored workshop. The workshop brought together a number of industry groups - vehicle OEMS, cylinder manufacturers, compressor and refueling station manufacturers, natural gas distribution companies, and industry advisory personnel. The workshop focused on issues relating to on-board vehicle fuel storage pressure, cylinder standardization, R D needs identification, and prospects for formation of a consortium for CNG fuel storage.

  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 RankADVANCED MANUFACTURING OFFICESpecialAPPENDIX FOrigin ofAllen Lichvar FEof Energy NEWNGV and FCV Light

  4. 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:FinancingPetroleum12,Executive CompensationEnergyGetDepartment1Sustained Pumping

  5. Human Development Major Career Tree 2014-2015 This document is intended as a SUPPLEMENT to Human Ecology college requirements and the HD curriculum sheet for your matriculation year.

    E-Print Network [OSTI]

    Chen, Tsuhan

    seminar course in addition to HD laboratory course (3) Take research methods (4) Complete a practicum seminar Essential Foundations: (1) Human Development First Year Classes (HD1150, HD1160, HD1170); (2Human Development Major Career Tree 2014-2015 This document is intended as a SUPPLEMENT to Human

  6. IMPROVED V II log(gf) VALUES, HYPERFINE STRUCTURE CONSTANTS, AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937

    SciTech Connect (OSTI)

    Wood, M. P.; Lawler, J. E.; Den Hartog, E. A.; Sneden, C.; Cowan, J. J. E-mail: jelawler@wisc.edu E-mail: chris@verdi.as.utexas.edu

    2014-10-01

    New experimental absolute atomic transition probabilities are reported for 203 lines of V II. Branching fractions are measured from spectra recorded using a Fourier transform spectrometer and an echelle spectrometer. The branching fractions are normalized with radiative lifetime measurements to determine the new transition probabilities. Generally good agreement is found between this work and previously reported V II transition probabilities. Two spectrometers, independent radiometric calibration methods, and independent data analysis routines enable a reduction in systematic uncertainties, in particular those due to optical depth errors. In addition, new hyperfine structure constants are measured for selected levels by least squares fitting line profiles in the FTS spectra. The new V II data are applied to high resolution visible and UV spectra of the Sun and metal-poor star HD 84937 to determine new, more accurate V abundances. Lines covering a range of wavelength and excitation potential are used to search for non-LTE effects. Very good agreement is found between our new solar photospheric V abundance, log ?(V) = 3.95 from 15 V II lines, and the solar-system meteoritic value. In HD 84937, we derive [V/H] = –2.08 from 68 lines, leading to a value of [V/Fe] = 0.24.

  7. HD gas purification for polarized HDice targets production at Jefferson Lab

    SciTech Connect (OSTI)

    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

    2014-06-01

    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).

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

    Broader source: Energy.gov [DOE]

    Measuring particle emissions from a 2010 compliant HD Diesel tractor while traveling on-road for 2300 miles found average gravimetric TPM over the entire route to be well below EPA's 2010 PM standard.

  9. THE UNUSUAL HYDROCARBON EMISSION FROM THE EARLY CARBON STAR HD 100764: THE CONNECTION BETWEEN AROMATICS AND ALIPHATICS

    E-Print Network [OSTI]

    Sloan, Gregory C.

    THE UNUSUAL HYDROCARBON EMISSION FROM THE EARLY CARBON STAR HD 100764: THE CONNECTION BETWEEN disk. The spectrum shows emission features from polycyclic aro- matic hydrocarbons (PAHs shifts are consistent with hydrocarbon mixtures containing both aromatic and aliphatic bonds. We propose

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

    SciTech Connect (OSTI)

    Kageya, Tsuneo

    2014-01-01

    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.

  11. Spitzer-IRS Sectroscopy of the Prototype Wolf-Rayet star EZ CMa (HD 50896)

    E-Print Network [OSTI]

    P W Morris; P A Crowther; J R Houck

    2004-06-03

    We present mid-infrared Spitzer-IRS spectroscopy of the prototype WN star EZ CMa (HD50896, WN4b). Numerous stellar wind lines of HeII are revealed, plus fine-structure lines of [NeIII] 15.5um and [OIV] 25.9um. We carry out a spectroscopic analysis of HD50896 allowing for line blanketing and clumping, which is compared to the mid-IR observations. We make use of these stellar properties to accurately derive Ne/He=1.2-1.8E-4 and O/He=4.2-4.8E-5 by number, for the first time in an early WN star. In addition, we obtain N/C=40 and N/O=50 by number, values in perfect agreement with current predictions for rotating massive stars at the end of interior hydrogen burning.

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

    E-Print Network [OSTI]

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

    2003-02-14

    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.

  13. Polycyclic Aromatic Hydrocarbons Orbiting HD 233517, an Evolved Oxygen-Rich Red Giant

    E-Print Network [OSTI]

    M. Jura; J. Bohac; B. Sargent; W. J. Forrest; J. Green; D. M. Watson; G. C. Sloan; F. Markwick-Kemper; C. H. Chen; J. Najita

    2005-12-14

    We report spectra obtained with the Spitzer Space Telescope in the 5 to 35 micron range of HD 233517, an evolved K2 III giant with circumstellar dust. At wavelengths longer than 13 microns, the flux is a smooth continuum that varies approximately as frequency to the -5/3 power. For wavelengths shorter than 13 microns, although the star is oxygen-rich, PAH features produced by carbon-rich species at 6.3 microns, 8.2 microns, 11.3 microns and 12.7 microns are detected along with likely broad silicate emission near 20 microns. These results can be explained if there is a passive, flared disk orbiting HD 233517. Our data support the hypothesis that organic molecules in orbiting disks may be synthesized in situ as well as being incorporated from the interstellar medium.

  14. The Isotopic Mixture of Barium in the Metal-poor Subgiant HD 140283

    E-Print Network [OSTI]

    David L. Lambert; Carlos Allende Prieto

    2002-05-22

    Analyses of the abundances of neutron-capture elements have led to the belief that these elements in metal-poor stars are r-process products with relative abundances closely resembling those found in the solar system. This picture was challenged by Magain (1995), who found that a pure r-process mix of the barium isotopes was inconsistent with the mix of odd to even barium isotopes derived from analysis of the Ba II line at 4554 A in the spectrum of the metal-poor subgiant HD 140283. In this paper, we address Magain's challenge using new high resolution high signal-to-noise spectra of HD 140283, and find, in contrast to his result, that a solar-like r-process isotopic mixture provides a fair fit to the observed 4554 A profile.

  15. BVR photometry of a newly identified RS CVn binary star HD 61396

    E-Print Network [OSTI]

    Sudhanshu Barway; S. K. Pandey; Padmakar Singh Parihar

    2004-08-10

    BVR photometry of a recently identified RS CVn binary star HD61396, carried out during 2001, is presented. The new photometry reveal significant evolution in the shape and amplitude of light curve when compared with those reported earlier by Padmakar etal (2000). The traditional two-starspot model has been used to obtain the spot parameters from the observed light curve. Changes in the spot area and their location on the stellar surface are discernible from the extracted parameters from the new photometry.

  16. Near-infrared integral-field spectroscopy of HD209458b

    E-Print Network [OSTI]

    Daniel Angerhausen; Alfred Krabbe; Christof Iserlohe

    2006-05-12

    We present first results of an exploratory study to use integral field spectroscopy to observe extrasolar planets. We focus on transiting "Hot Jupiters" and emphasize the importance of observing strategy and exact timing. We demonstrate how integral field spectroscopy compares with other spectroscopic techniques currently applied. We have tested our concept with a time series observation of HD209458b obtained with SINFONI at the VLT during a superior conjunction.

  17. Dynamics and Disequilibrium Carbon Chemistry in Hot Jupiter Atmospheres, With Application to HD 209458b

    E-Print Network [OSTI]

    Curtis S. Cooper; Adam P. Showman

    2006-05-30

    Chemical equilibrium considerations suggest that, assuming solar elemental abundances, carbon on HD 209458b is sequestered primarily as carbon monoxide (CO) and methane (CH4). The relative mole fractions of CO(g) and CH4(g) in chemical equilibrium are expected to vary greatly according to variations in local temperature and pressure. We show, however, that in the p = 1--1000 mbar range, chemical equilibrium does not hold. To explore disequilibrium effects, we couple the chemical kinetics of CO and CH4 to a three-dimensional numerical model of HD 209458b's atmospheric circulation. These simulations show that vigorous dynamics caused by uneven heating of this tidally locked planet homogenize the CO and CH4 concentrations at p < 1 bar, even in the presence of lateral temperature variations of ~500--1000 K. In the 1--1000 mbar pressure range, we find that over 98% of the carbon is in CO. This is true even in cool regions where CH4 is much more stable thermodynamically. Our work shows furthermore that planets 300--500 K cooler than HD 209458b can also have abundant CO in their upper layers due to disequilibrium effects. We demonstrate several interesting observational consequences of these results.

  18. THE ANGLO-AUSTRALIAN PLANET SEARCH. XX. A SOLITARY ICE-GIANT PLANET ORBITING HD 102365

    SciTech Connect (OSTI)

    Tinney, C. G.; Wittenmyer, Robert A.; Bailey, Jeremy; Butler, R. Paul; Jones, Hugh R. A.; O'Toole, Simon; Carter, Brad D.

    2011-02-01

    We present 12 years of precision Doppler data for the very nearby G3 star HD 102365, which reveals the presence of a Neptune-like planet with a 16.0 M{sub Earth} minimum mass in a 122.1 day orbit. Very few 'Super Earth' planets have been discovered to date in orbits this large and those that have been found reside in multiple systems of between three and six planets. HD 102365 b, in contrast, appears to orbit its star in splendid isolation. Analysis of the residuals to our Keplerian fit for HD 102365 b indicates that there are no other planets with minimum mass above 0.3 M{sub Jup} orbiting within 5 AU and no other 'Super Earths' more massive than 10 M{sub Earth} orbiting at periods shorter than 50 days. At periods of less than 20 days these limits drop to as low as 6 M{sub Earth}. There are now 32 exoplanets known with minimum mass below 20 M{sub Earth}, and interestingly the period distributions of these low-mass planets seem to be similar whether they orbit M-, K-, or G-type dwarfs.

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

    SciTech Connect (OSTI)

    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)

    2011-07-15

    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.

  20. Water vapor in the spectrum of the extrasolar planet HD 189733b. II. The eclipse

    SciTech Connect (OSTI)

    Crouzet, Nicolas; McCullough, Peter R.; Deming, Drake; Madhusudhan, Nikku

    2014-11-10

    Spectroscopic observations of exoplanets are crucial to infer the composition and properties of their atmospheres. HD 189733b is one of the most extensively studied exoplanets and is a cornerstone for hot Jupiter models. In this paper, we report the dayside emission spectrum of HD 189733b in the wavelength range 1.1-1.7 ?m obtained with the Hubble Space Telescope Wide Field Camera 3 (WFC3) in spatial scan mode. The quality of the data is such that even a straightforward analysis yields a high-precision Poisson noise-limited spectrum: the median 1? uncertainty is 57 ppm per 0.02 ?m bin. We also build a white-light curve correcting for systematic effects and derive an absolute eclipse depth of 96 ± 39 ppm. The resulting spectrum shows marginal evidence for water vapor absorption, but can also be well explained by a blackbody spectrum. However, the combination of these WFC3 data with previous Spitzer photometric observations is best explained by a dayside atmosphere of HD 189733b with no thermal inversion and a nearly solar or subsolar H{sub 2}O abundance in a cloud-free atmosphere. Alternatively, this apparent subsolar abundance may be the result of clouds or hazes that future studies need to investigate.

  1. New analysis indicates no thermal inversion in the atmosphere of HD 209458b

    SciTech Connect (OSTI)

    Diamond-Lowe, Hannah; Stevenson, Kevin B.; Bean, Jacob L.; Line, Michael R.; Fortney, Jonathan J.

    2014-11-20

    An important focus of exoplanet research is the determination of the atmospheric temperature structure of strongly irradiated gas giant planets, or hot Jupiters. HD 209458b is the prototypical exoplanet for atmospheric thermal inversions, but this assertion does not take into account recently obtained data or newer data reduction techniques. We reexamine this claim by investigating all publicly available Spitzer Space Telescope secondary-eclipse photometric data of HD 209458b and performing a self-consistent analysis. We employ data reduction techniques that minimize stellar centroid variations, apply sophisticated models to known Spitzer systematics, and account for time-correlated noise in the data. We derive new secondary-eclipse depths of 0.119% ± 0.007%, 0.123% ± 0.006%, 0.134% ± 0.035%, and 0.215% ± 0.008% in the 3.6, 4.5, 5.8, and 8.0 ?m bandpasses, respectively. We feed these results into a Bayesian atmospheric retrieval analysis and determine that it is unnecessary to invoke a thermal inversion to explain our secondary-eclipse depths. The data are well fitted by a temperature model that decreases monotonically between pressure levels of 1 and 0.01 bars. We conclude that there is no evidence for a thermal inversion in the atmosphere of HD 209458b.

  2. RESONANCES REQUIRED: DYNAMICAL ANALYSIS OF THE 24 Sex AND HD 200964 PLANETARY SYSTEMS

    SciTech Connect (OSTI)

    Wittenmyer, Robert A.; Horner, Jonathan; Tinney, C. G., E-mail: rob@phys.unsw.edu.au [Department of Astrophysics, School of Physics, Faculty of Science, University of New South Wales, NSW 2052 (Australia)

    2012-12-20

    We perform several suites of highly detailed dynamical simulations to investigate the architectures of the 24 Sextantis and HD 200964 planetary systems. The best-fit orbital solution for the two planets in the 24 Sex system places them on orbits with periods that lie very close to 2:1 commensurability, while that for the HD 200964 system places the two planets therein in orbits whose periods lie close to a 4:3 commensurability. In both cases, the proposed best-fit orbits are mutually crossing-a scenario that is only dynamically feasible if the planets are protected from close encounters by the effects of mutual mean-motion resonance (MMR). Our simulations reveal that the best-fit orbits for both systems lie within narrow islands of dynamical stability, and are surrounded by much larger regions of extreme instability. As such, we show that the planets are only feasible if they are currently trapped in mutual MMR-the 2:1 resonance in the case of 24 Sex b and c, and the 4:3 resonance in the case of HD 200964 b and c. In both cases, the region of stability is strongest and most pronounced when the planetary orbits are mutually coplanar. As the inclination of planet c with respect to planet b is increased, the stability of both systems rapidly collapses.

  3. The Abundance Distribution in the Extrasolar-Planet Host Star HD19994

    E-Print Network [OSTI]

    Verne V. Smith; Katia Cunha; Daniela Lazzaro

    2001-03-04

    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).

  4. Dust and Polycyclic Aromatic Hydrocarbon in the HD 34700 Debris Disk

    E-Print Network [OSTI]

    Seok, Ji Yeon

    2015-01-01

    The debris disk around the Vega-type star HD 34700 is detected in dust thermal emission from the near infrared (IR) to millimeter (mm) and submm wavelength range. Also detected is a distinct set of emission features at 3.3, 6.2, 7.7, 8.6, 11.3 and 12.7 $\\mu$m, which are commonly attributed to polycyclic aromatic hydrocarbon (PAH) molecules. We model the observed dust IR spectral energy distribution (SED) and PAH emission features of the HD 34700 disk in terms of porous dust and astronomical-PAHs. Porous dust together with a mixture of neutral and ionized PAHs closely explains the dust IR SED and PAH emission features observed in the HD 34700 disk. Due to the stellar radiation pressure and Poynting-Robertson drag together with the photodissociation of PAHs, substantial removal of dust and PAHs has occurred in the disk, and continuous replenishment of these materials is required to maintain their current abundances. This implies that these materials are not primitive but secondary products probably originating ...

  5. IMPROVED Ni I log(gf) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937

    SciTech Connect (OSTI)

    Wood, M. P.; Lawler, J. E.; Sneden, C.; Cowan, J. J. E-mail: jelawler@wisc.edu E-mail: cowan@nhn.ou.edu

    2014-04-01

    Atomic transition probability measurements for 371 Ni I lines in the UV through near-IR are reported. Branching fractions from data recorded using a Fourier transform spectrometer and a new echelle spectrograph are combined with published radiative lifetimes to determine these transition probabilities. Generally good agreement is found in comparisons to previously reported Ni I transition probability measurements. Use of the new echelle spectrograph, independent radiometric calibration methods, and independent data analysis routines enable a reduction of systematic errors and overall improvement in transition probability uncertainty over previous measurements. The new Ni I data are applied to high-resolution visible and UV spectra of the Sun and metal-poor star HD 84937 to derive new, more accurate Ni abundances. Lines covering a wide range of wavelength and excitation potential are used to search for non-LTE effects.

  6. NEW PRECISION ORBITS OF BRIGHT DOUBLE-LINED SPECTROSCOPIC BINARIES. V. THE AM STARS HD 434 AND 41 SEXTANTIS

    SciTech Connect (OSTI)

    Fekel, Francis C. [Kitt Peak National Observatory, National Optical Astronomy Observatory (United States); Williamson, Michael H., E-mail: fekel@evans.tsuniv.ed [Center of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Boulevard, Box 9501, Nashville, TN 37209 (United States)

    2010-11-15

    We have detected the secondary component in two previously known spectroscopic binaries, HD 434 and 41 Sex, and for the first time determined double-lined orbits for them. Despite the relatively long period of 34.26 days and a moderate eccentricity of 0.32, combined with the components' rotationally broadened lines, measurement of the primary and secondary radial velocities of HD 434 has enabled us to obtain significantly improved orbital elements. While the 41 Sex system has a much shorter period of 6.167 days and a circular orbit, the estimated V mag difference of 3.2 between its components also makes this a challenging system. The new orbital dimensions (a{sub 1} sin i and a{sub 2} sin i) and minimum masses (m{sub 1} sin{sup 3} i and m{sub 2} sin{sup 3} i) of HD 434 have accuracies of 0.8% or better, while the same quantities for 41 Sex are good to 0.5% or better. Both components of HD 434 are Am stars while the Am star primary of 41 Sex has a late-F or early-G companion. All four stars are on the main sequence. The two components of HD 434 are rotating much faster than their predicted pseudosynchronous velocities, while both components of 41 Sex are synchronously rotating. For the primary of 41 Sex, the spectrum line depth changes noted by Sreedhar Rao et al. were not detected.

  7. Test Results of HD1b, an upgraded 16 Tesla Nb3Sn DipoleMagnet

    SciTech Connect (OSTI)

    Lietzke, A.F.; Bartlett, S.E.; Bish, P.; Caspi, S.; Dietderich,D.; Ferracin, P.; Gourlay, S.; Hafalia, A.R.; Hannaford, C.R.; Higley,H.; Lau, W.; Liggins, N.; Mattafirri, S.; Nyman, M.; Sabbi, G.; Scanlan,R.; Swanson, J.

    2005-04-16

    The Superconducting Magnet Group at Lawrence Berkeley National Laboratory has been developing high-field, brittle-superconductor, accelerator magnet technology, in which the conductor's support system can significantly impact conductor performance (as well as magnet training). A recent H-dipole coil test (HD1) achieved a peak bore-field of 16 Tesla, using two, flat-racetrack, double-layer Nb{sub 3}Sn coils. However, its 4.5 K training was slow, with an erratic plateau at {approx}92% of its un-degraded ''short-sample'' expectation ({approx}16.6 T). Quench-origins correlated with regions where low conductor pre-stress had been expected (3-D FEM predictions and variations in 300 K coil-size). The coils were re-assembled with minor coil-support changes and re-tested as ''HD1b'', with a 185 MPa average pre-stress (30 MPa higher than HD1, with a 15-20 MPa pole-turn margin expected at 17 T). Training started higher (15.1 T), and quickly reached a stable, negligibly higher plateau at 16 T. After a thermal cycle, training started at 15.4 T, but peaked at 15.8 T, on the third attempt, before degrading to a 15.7 T plateau. The temperature dependence of this plateau was explored in a sub-atmospheric LHe bath to 3.0 K. Magnet performance data for both thermal cycles is presented and discussed, along with issues for future high-field accelerator magnet development.

  8. The CoRoT primary target HD 52265: models and seismic tests

    E-Print Network [OSTI]

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

    2007-05-17

    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.

  9. Seismic modelling of the rotating, slowly pulsating B-type star HD 21071

    E-Print Network [OSTI]

    Szewczuk, Wojciech

    2015-01-01

    Interpretation of the oscillation spectrum of the slowly pulsating B-type star HD21071 is presented. We show that non-rotating models cannot account for the two highest amplitude frequencies and taking into account the effects of rotation is necessary. Rotating seismic models are constructed using various chemical compositions, opacity data, core overshooting parameters and rotational velocities. There are prospects for seismic modelling of SPB stars, even if no asymptotic pattern is observed in their oscillation spectra, provided an unambiguous mode identification is doable and the effects of rotation are properly included.

  10. A probable planetary companion to HD 39091 from the Anglo-Australian Planet Search

    E-Print Network [OSTI]

    Jones, H R A; Tinney, C G; Marcy, G W; Penny, A J; McCarthy, C; Carter, B D; Pourbaix, D; Jones, Hugh R. A.; Marcy, Geoffrey W.; Penny, Alan J.; Carthy, Chris Mc; Carter, Brad D.; Pourbaix, Dimitri

    2002-01-01

    We report the detection of a extrasolar planet candidate orbiting the G1 V star HD 39091. The orbital period is 2083 d and the eccentricity is 0.62. With a minimum (M sin $i$) mass of 10.3 M$_{\\rm JUP}$ this object falls near the high mass end of the observed planet mass function, and may plausibly be a brown dwarf. Other characteristics of this system, including orbital eccentricity and metallicity, are typical of the well populated class of radial velocity planets in eccentric orbits around metal-rich stars.

  11. A probable planetary companion to HD 39091 from the Anglo-Australian Planet Search

    E-Print Network [OSTI]

    Hugh R. A. Jones; R. Paul Butler; C. G. Tinney; Geoffrey W. Marcy; Alan J. Penny; Chris McCarthy; Brad D. Carter; Dimitri Pourbaix

    2001-12-04

    We report the detection of a extrasolar planet candidate orbiting the G1 V star HD 39091. The orbital period is 2083 d and the eccentricity is 0.62. With a minimum (M sin $i$) mass of 10.3 M$_{\\rm JUP}$ this object falls near the high mass end of the observed planet mass function, and may plausibly be a brown dwarf. Other characteristics of this system, including orbital eccentricity and metallicity, are typical of the well populated class of radial velocity planets in eccentric orbits around metal-rich stars.

  12. The massive double-lined O-type binary HD 165052

    E-Print Network [OSTI]

    J. I. Arias; N. I. Morrell; R. H. Barba; G. L. Bosch; M. Grosso; M. Corcoran; .

    2002-05-07

    We present a new optical spectroscopic study of the O-type binary HD 165052 based on high- and intermediate-resolution CCD observations. We re-investigated the spectral classification of the binary components, obtaining spectral types of O6.5 V and O7.5 V for the primary and secondary, respectively, finding that both stars display weak C {\\sc iii} $\\lambda5696$ emission in their spectra. We also determined a radial-velocity orbit for HD 165052 with a period of 2.95510 $\\pm$ 0.00001 d, and semiamplitudes of 94.8 and 104.7 $\\pm$ 0.5 km s$^{-1}$, resulting in a mass ratio $Q = 0.9$. From a comparison with previous radial-velocity determinations, we found evidence of apsidal motion in the system. Several signatures of wind-wind collision, such as phase-locked variability of the X-ray flux and the Struve-Sahade effect, are also considered. It was also found that the reddening in the region should be normal, in contrast with previous determinations.

  13. New spectroscopic and polarimetric observations of the A0 supergiant HD92207

    E-Print Network [OSTI]

    Hubrig, S; Schöller, M; Anderson, R I; Saesen, S; Gonzalez, J F; Ilyin, I; Briquet, M

    2015-01-01

    Our recent search for the presence of a magnetic field in the bright early A-type supergiant HD92207 using FORS2 in spectropolarimetric mode revealed the presence of a longitudinal magnetic field of the order of a few hundred Gauss. However, the definite confirmation of the magnetic nature of this object remained pending due to the detection of short-term spectral variability probably affecting the position of line profiles in left- and right-hand polarized spectra. We present new magnetic field measurements of HD92207 obtained on three different epochs in 2013 and 2014 using FORS2 in spectropolarimetric mode. A 3sigma detection of the mean longitudinal magnetic field using the entire spectrum, _all=104+-34G, was achieved in observations obtained in 2014 January. At this epoch, the position of the spectral lines appeared stable. Our analysis of spectral line shapes recorded in opposite circularly polarized light, i.e. in light with opposite sense of rotation, reveals that line profiles in the light polarized ...

  14. High-precision K-band photometry of the secondary eclipse of HD209458

    E-Print Network [OSTI]

    Ignas Snellen

    2005-07-26

    Recently, mid-infrared Spitzer observations have been presented that show the light decrement due to the passage of a planet behind its host star. These measurements of HD209458b and TrES-1 are the first detections of direct light from an extra-solar planet. Interpretation of these results in terms of planet equipartition temperature and bond albedo is however strongly model dependent and require additional observations at shorter wavelengths. Here we report on two attempts to detect the secondary eclipse of HD209458b from the ground in K-band, using the UK InfraRed Telescope (UKIRT). A photometry precision of 0.12% relative to two nearby reference stars was reached during both occasions, but no firm detection of the eclipses were obtained. The first observation shows a flux decrement of -0.13+-0.18%, and the second of -0.10+-0.10%. A detailed description of the observing strategy, data reduction and analysis is given, and a discussion on how the precision in ground-based K-band photometry could be further improved. In addition we show that the relative photometry between the target and the reference stars between the two epochs is consistent down to the <0.1% level, which is interesting in the light of possible near-infrared surveys to search for transiting planets around M and L dwarfs.

  15. Long-term spectroscopic monitoring of the Luminous Blue Variable HD160529

    E-Print Network [OSTI]

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

    2002-12-20

    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.

  16. ASTEROSEISMOLOGY OF THE TRANSITING EXOPLANET HOST HD 17156 WITH HUBBLE SPACE TELESCOPE FINE GUIDANCE SENSOR

    SciTech Connect (OSTI)

    Gilliland, Ronald L.; McCullough, Peter R.; Nelan, Edmund P. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Brown, Timothy M. [Las Cumbres Observatory Global Telescope, Goleta, CA 93117 (United States); Charbonneau, David; Nutzman, Philip [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Christensen-Dalsgaard, Joergen; Kjeldsen, Hans, E-mail: gillil@stsci.edu [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)

    2011-01-01

    Observations conducted with the Fine Guidance Sensor on the Hubble Space Telescope (HST) providing high cadence and precision time-series photometry were obtained over 10 consecutive days in 2008 December on the host star of the transiting exoplanet HD 17156b. During this time, 1.0 x 10{sup 12} photons (corrected for detector dead time) were collected in which a noise level of 163 parts per million per 30 s sum resulted, thus providing excellent sensitivity to the detection of the analog of the solar 5-minute p-mode oscillations. For HD 17156, robust detection of p modes supports the determination of the stellar mean density of ({rho}{sub *}) = 0.5301 {+-} 0.0044 g cm{sup -3} from a detailed fit to the observed frequencies of modes of degree l = 0, 1, and 2. This is the first star for which the direct determination of ({rho}{sub *}) has been possible using both asteroseismology and detailed analysis of a transiting planet light curve. Using the density constraint from asteroseismology, and stellar evolution modeling results in M{sub *} = 1.285 {+-} 0.026 M{sub sun}, R{sub *} = 1.507 {+-} 0.012 R{sub sun}, and a stellar age of 3.2 {+-} 0.3 Gyr.

  17. Spectrally resolved detection of sodium in the atmosphere of HD189733b with the HARPS spectrograph

    E-Print Network [OSTI]

    Wyttenbach, A; Lovis, C; Udry, S; Pepe, F

    2015-01-01

    Atmospheric properties of exoplanets can be constrained with transit spectroscopy. The signature of atomic sodium NaI, known to be present above the clouds, is a powerful probe of the upper atmosphere, where it can be best detected and characterized at high spectral resolution. Our goal is to obtain a high-resolution transit spectrum of HD189733b in the region around the resonance doublet of NaI at 589 nm, to characterize the absorption signature previously detected from space at low resolution. We analyze archival transit data of HD189733b obtained with the HARPS spectrograph. We retrieve the transit spectrum and light curve of the planet, implementing corrections for telluric contamination and planetary orbital motion. We spectrally resolve the NaI D doublet and measure line contrasts of $0.64\\pm0.07\\%$ (D2) and $0.40\\pm0.07\\%$ (D1) and FWHMs of $0.52\\pm0.08~\\AA$. This corresponds to a detection at the 10-$\\sigma$ level of excess of absorption of $0.32\\pm0.03\\%$ in a passband of $2\\times0.75\\ \\AA$ centered ...

  18. Optical hydrogen absorption consistent with a thin bow shock leading the hot Jupiter HD 189733b

    E-Print Network [OSTI]

    Cauley, P Wilson; Jensen, Adam G; Barman, Travis; Endl, Michael; Cochran, William D

    2015-01-01

    Bow shocks are ubiquitous astrophysical phenomena resulting from the supersonic passage of an object through a gas. Recently, pre-transit absorption in UV metal transitions of the hot Jupiter exoplanets HD 189733b and WASP12-b have been interpreted as being caused by material compressed in a planetary bow shock. Here we present a robust detection of a time-resolved pre-transit, as well as in-transit, absorption signature around the hot Jupiter exoplanet HD 189733b using high spectral resolution observations of several hydrogen Balmer lines. The line shape of the pre-transit feature and the shape of the time series absorption provide the strongest constraints on the morphology and physical characteristics of extended structures around an exoplanet. The in-transit measurements confirm the previous exospheric H-alpha detection although the absorption depth measured here is ~50% lower. The pre-transit absorption feature occurs 125 minutes before the predicted optical transit, a projected linear distance from the ...

  19. Separated fringe packet observations with the Chara Array. II. ? Andromeda, HD 178911, and ? Cephei

    SciTech Connect (OSTI)

    Farrington, C. D.; Ten Brummelaar, T. A.; Turner, N. H.; Sturmann, L.; Sturmann, J.; Mason, B. D.; Hartkopf, W. I.; Mourard, D.; Moravveji, E.; McAlister, H. A. E-mail: theo@chara-array.org E-mail: sturmann@chara-array.org E-mail: bdm@usno.navy.mil E-mail: denis.mourard@oca.eu E-mail: hal@chara.gsu.edu

    2014-09-01

    When observed with optical long-baseline interferometers, components of a binary star that are sufficiently separated produce their own interferometric fringe packets; these are referred to as separated fringe packet (SFP) binaries. These SFP binaries can overlap in angular separation with the regime of systems resolvable by speckle interferometry at single, large-aperture telescopes and can provide additional measurements for preliminary orbits lacking good phase coverage, help constrain elements of already established orbits, and locate new binaries in the undersampled regime between the bounds of spectroscopic surveys and speckle interferometry. In this process, a visibility calibration star is not needed, and the SFPs can provide an accurate vector separation. In this paper, we apply the SFP approach to ? Andromeda, HD 178911, and ? Cephei with the CLIMB three-beam combiner at the CHARA Array. For these systems we determine component masses and parallax of 0.963 ± 0.049 M {sub ?} and 0.860 ± 0.051 M {sub ?} and 39.54 ± 1.85 mas for ? Andromeda, for HD 178911 of 0.802 ± 0.055 M {sub ?} and 0.622 ± 0.053 M {sub ?} with 28.26 ± 1.70 mas, and masses of 1.045 ± 0.031 M {sub ?} and 0.408 ± 0.066 M {sub ?} and 38.10 ± 2.81 mas for ? Cephei.

  20. Asteroseismic analysis of the CoRoT target HD 49933

    SciTech Connect (OSTI)

    Liu, Zhie; Yang, Wuming; Bi, Shaolan; Tian, Zhijia; Liu, Kang; Ge, Zhishuai; Yu, Jie; He, Xin; Wu, Yaqian; Chintarungruangchai, P.; Li, Tanda; Tan, Xiaoyan

    2014-01-10

    The frequency ratios r {sub 10} and r {sub 01} of HD 49933 exhibit an increase at high frequencies. This behavior also exists in the ratios of other stars, which is considered to result from the low signal-to-noise ratio and the larger linewidth at the high-frequency end and could not be predicted by stellar models in previous work. Our calculations show that the behavior not only can be reproduced by stellar models, but can be predicted by asymptotic formulas of the ratios. The frequency ratios of the Sun, too, can be reproduced well by the asymptotic formulas. The increased behavior derives from the fact that the gradient of mean molecular weight at the bottom of the radiative region hinders the propagation of p-modes, while the hindrance does not exist in the convective core. This behavior should exist in the ratios of stars with a large convective core. The characteristic of the ratios at high frequencies provides a strict constraint on stellar models and aids in determining the size of the convective core and the extent of overshooting. Observational constraints point to a star with M = 1.28 ± 0.01 M {sub ?}, R = 1.458 ± 0.005 R {sub ?}, t = 1.83 ± 0.1 Gyr, r{sub cc} = 0.16 ± 0.02 R {sub ?}, ? = 1.85 ± 0.05, and ?{sub ov} =0.6 ± 0.2 for HD 49933.

  1. The curious case of HD 41248. A pair of static signals buried behind red noise

    SciTech Connect (OSTI)

    Jenkins, J. S.; Tuomi, M.

    2014-10-20

    Gaining a better understanding of the effects of stellar-induced radial velocity noise is critical for the future of exoplanet studies since the discovery of the lowest-mass planets using this method will require us to go below the intrinsic stellar noise limit. An interesting test case in this respect is that of the southern solar analog HD 41248. The radial velocity time series of this star has been proposed to contain either a pair of signals with periods of around 18 and 25 days, which could be due to a pair of resonant super-Earths, or a single and varying 25 day signal that could arise due to a complex interplay between differential rotation and modulated activity. In this work, we build up more evidence for the former scenario, showing that the signals are still clearly significant, even after more than 10 yr of observations, and they likely do not change in period, amplitude, or phase as a function of time, the hallmarks of static Doppler signals. We show that over the last two observing seasons, this star was more intrinsically active and the noise reddened, highlighting why better noise models are needed to find the lowest amplitude signals, in particular, models that consider noise correlations. This analysis shows that there is still sufficient evidence for the existence of two super-Earths on the edge of, or locked into, a 7:5 mean motion resonance orbiting HD 41248.

  2. Recent Test Results of the High Field Nb3Sn Dipole Magnet HD2

    SciTech Connect (OSTI)

    Ferracin, P.; Bingham, B.; Caspi, S.; Cheng, D. W.; Dietderich, D. R.; Felice, H.; Hafalia, A. R.; Hannaford, C. R.; Joseph, J.; Lietzke, A. F.; Lizarazo, J.; Sabbi, G.; Wang, X.

    2009-10-19

    The 1 m long Nb{sub 3}Sn dipole magnet HD2, fabricated and tested at Lawrence Berkeley National Laboratory, represents a step towards the development of block-type accelerator quality magnets operating in the range of 13-15 T. The magnet design features two coil modules composed of two layers wound around a titanium-alloy pole. The layer 1 pole includes a round cutout to provide room for a bore tube with a clear aperture of 36 mm. After a first series of tests where HD2 reached a maximum bore field of 13.8 T, corresponding to an estimated peak field on the conductor of 14.5 T, the magnet was disassembled and reloaded without the bore tube and with a clear aperture increased to 43 mm. We describe in this paper the magnet training observed in two consecutive tests after the removal of the bore tube, with a comparison of the quench performance with respect to the previous tests. An analysis of the voltage signals recorded before and after training quenches is then presented and discussed, and the results of coil visual inspections reported.

  3. The corona of HD 189733 and its X-ray activity

    SciTech Connect (OSTI)

    Pillitteri, I.; Wolk, S. J.; Günther, H. M.; Cohen, O.; Kashyap, V.; Drake, J. J.; Lopez-Santiago, J.; Sciortino, S.

    2014-04-20

    Testing whether close-in massive exoplanets (hot Jupiters) can enhance the stellar activity in their host primary is crucial for the models of stellar and planetary evolution. Among systems with hot Jupiters, HD 189733 is one of the best studied because of its proximity, strong activity, and the presence of a transiting planet, which allows transmission spectroscopy and a measure of the planetary radius and its density. Here we report on the X-ray activity of the primary star, HD 189733 A, using a new XMM-Newton observation and a comparison with the previous X-ray observations. The spectrum in the quiescent intervals is described by two temperatures at 0.2 keV and 0.7 keV, while during the flares a third component at 0.9 keV is detected. With the analysis of the summed Reflection Grating Spectrometer spectra, we obtain estimates of the electron density in the range n{sub e} = (1.6-13) × 10{sup 10} cm{sup –3}, and thus the corona of HD 189733 A appears denser than the solar one. For the third time, we observe a large flare that occurred just after the eclipse of the planet. Together with the flares observed in 2009 and 2011, the events are restricted to a small planetary phase range of ? = 0.55-0.65. Although we do not find conclusive evidence of a significant excess of flares after the secondary transits, we suggest that the planet might trigger such flares when it passes close to the locally high magnetic field of the underlying star at particular combinations of stellar rotational phases and orbital planetary phases. For the most recent flares, a wavelet analysis of the light curve suggests a loop of length of four stellar radii at the location of the bright flare, and a local magnetic field of the order of 40-100 G, in agreement with the global field measured in other studies. The loop size suggests an interaction of magnetic nature between planet and star, separated by only ?8R {sub *}. The X-ray variability of HD 189733 A is larger than the variability of field stars and young Pleiades of similar spectral type and X-ray luminosity. We also detect the stellar companion (HD 189733 B, ?12'' from the primary star) in this XMM-Newton observation. Its very low X-ray luminosity (L{sub X} = 3.4 × 10{sup 26} erg s{sup –1}) confirms the old age of this star and of the binary system. The high activity of the primary star is best explained by a transfer of angular momentum from the planet to the star.

  4. Assembly and Test of HD2, a 36 mm bore high field Nb3Sn Dipole Magnet

    E-Print Network [OSTI]

    Ferracin, P.

    2010-01-01

    Assembly and Test of HD2, a 36 mm bore high field Nb 3 Sna 15 T Nb 3 Sn dipole with a 35 mm bore”, IEEE Trans. Appl.Nb 3 Sn dipole magnet with a 35 mm bore”, IEEE Trans. Appl.

  5. ATMOSPHERE, INTERIOR, AND EVOLUTION OF THE METAL-RICH TRANSITING PLANET HD 149026b J. J. Fortney,1

    E-Print Network [OSTI]

    ranging from solar to 10 times solar and show how for cases with high metallicity or inefficient redistribution of energy from the dayside, the planet may develop a hot stratosphere due to absorption of stellar studies of HD 149026b and use a grid of self-consistent model atmospheres and high-pressure equations

  6. Chemical stratification in the atmosphere of Ap star HD 133792. Regularized solution of the vertical inversion problem

    E-Print Network [OSTI]

    O. Kochukhov; V. Tsymbal; T. Ryabchikova; V. Makaganyk; S. Bagnulo

    2006-09-12

    High spectral resolution studies of cool Ap stars reveal conspicuous anomalies of the shape and strength of many absorption lines. This is a signature of large atmospheric chemical gradients produced by the selective radiative levitation and gravitational settling of chemical species. Here we present a new approach to mapping the vertical chemical structures in stellar atmospheres. We have developed a regularized chemical inversion procedure that uses all information available in high-resolution stellar spectra. The new technique for the first time allowed us to recover chemical profiles without making a priori assumptions about the shape of chemical distributions. We have derived average abundances and applied the vertical inversion procedure to the high-resolution VLT UVES spectra of the weakly magnetic, cool Ap star HD 133792. Our analysis yielded improved estimates of the atmospheric parameters of HD 133792. We show that this star has negligible vsini and the mean magnetic field modulus =1.1+/-0.1 kG. We have derived average abundances for 43 ions and obtained vertical distributions of Ca, Si, Mg, Fe, Cr, and Sr. All these elements except Mg show high overabundance in the deep layers and solar or sub-solar composition in the upper atmosphere of HD 133792. In contrast, the Mg abundance increases with height. We find that transition from the metal-enhanced to metal-depleted zones typically occurs in a rather narrow range of depths in the atmosphere of HD 133792. Based on the derived photospheric abundances, we conclude that HD 133792 belongs to the rare group of evolved cool Ap stars, which possesses very large Fe-peak enhancement, but lacks a prominent overabundance of the rare-earth elements.

  7. Revisiting the effect of H2, HD and LiH molecules in the cooling of primordial gas

    E-Print Network [OSTI]

    Joaquin P. Prieto; Leopoldo Infante; Raul Jimenez

    2009-02-13

    We use a non-equilibrium chemical network to revisit and study the effect of H_{2}, HD and LiH molecular cooling on a primordial element of gas. We solve both the thermal and chemical equations for a gas element with an initial temperature T\\approx 1000K and a gas number density in the range n_{tot}=1-10^{4} cm^{-3}. At low densities, n_{tot}10^{2} cm^{-3}, the HD molecule dominates the gas temperature evolution. The effect of LiH is negligible in all cases. We studied the effect of D abundance on the gas cooling. The D abundance was set initially to be in the range n_{D}/n_{H}=10^{-7}-10^{-4.5}, with n_{HD}/n_{H}={D^{+}}/n_{H}=10^{-10}. The simulations show that at n_{tot}>10^{2} cm^{-3} the HD cooling dominates the temperature evolution for D abundances greater than 10^{-5}n_{H}. This number decrease at higher densities. Furthermore, we studied the effect of electrons and ionized particules on the gas temperature. We followed the gas temperature evolution with n_{H_{+}}/n_{H}=10^{-4}-10^{-1} and n_{D^{+}}/n_{H^{+}}=10^{-5}. The gas temperature reached lower values at high ionization degree because electrons, H^{+} and D^{+} are catalizers in the formation paths of the H_{2} and HD molecules, which are the main coolers at low temperatures. Finaly, we studied the effect of an OB star, with T_{eff}=4\\times 10^{4}K, would have on gas cooling. It is very difficult for a gas with n_{tot} in the range between 1-100 cm^{-3} to drop its temperature if the star is at a distance less than 100 pc.

  8. A detailed analysis of the HD 73526 2:1 resonant planetary system

    SciTech Connect (OSTI)

    Wittenmyer, Robert A.; Horner, Jonathan; Tinney, C. G.; Salter, G. S.; Bailey, J.; Wright, D.; Tan, Xianyu; Lee, Man Hoi; Butler, R. P.; Arriagada, P.; Carter, B. D.; Jones, H. R. A.; O'Toole, S. J.; Crane, J. D.; Schectman, S. A.; Thompson, I.; Minniti, D.; Diaz, M.

    2014-01-10

    We present six years of new radial velocity data from the Anglo-Australian and Magellan Telescopes on the HD 73526 2:1 resonant planetary system. We investigate both Keplerian and dynamical (interacting) fits to these data, yielding four possible configurations for the system. The new data now show that both resonance angles are librating, with amplitudes of 40° and 60°, respectively. We then perform long-term dynamical stability tests to differentiate these solutions, which only differ significantly in the masses of the planets. We show that while there is no clearly preferred system inclination, the dynamical fit with i = 90° provides the best combination of goodness-of-fit and long-term dynamical stability.

  9. AN ENIGMATIC POINT-LIKE FEATURE WITHIN THE HD 169142 TRANSITIONAL DISK ,

    SciTech Connect (OSTI)

    Biller, Beth A.; Males, Jared; Morzinski, Katie; Close, Laird M.; Follette, Katherine B.; Hinz, Philip M.; Rodigas, Timothy; Weinberger, Alycia; Juhász, Attila; Lacour, Sylvestre; Henning, Thomas; Pott, Jörg-Uwe; Köhler, Rainer; Bonnefoy, Mickaël

    2014-09-01

    We report the detection of a faint point-like feature possibly related to ongoing planet-formation in the disk of the transition disk star HD 169142. The point-like feature has a ?mag(L) ? 6.4, at a separation of ?0.''11 and position angle ?0°. Given its lack of an H or K{sub S} counterpart despite its relative brightness, this candidate cannot be explained by purely photospheric emission and must be a disk feature heated by an as yet unknown source. Its extremely red colors make it highly unlikely to be a background object, but future multi-wavelength follow up is necessary for confirmation and characterization of this feature.

  10. Reanalysis of radial velocity data from the resonant planetary system HD128311

    E-Print Network [OSTI]

    Rein, Hanno

    2015-01-01

    The multi-planetary system HD128311 hosts at least two planets. Its dynamical formation history has been studied extensively in the literature. We reanalyse the latest radial velocity data for this system with the affine-invariant Markov chain Monte Carlo sampler EMCEE. Using the high order integrator IAS15, we perform a fully dynamical fit, allowing the planets to interact during the sampling process. A stability analysis using the MEGNO indicator reveals that the system is located in a stable island of the parameter space. In contrast to a previous study, we find that the system is locked in a 2:1 mean motion resonance. The resonant angle $\\varphi_1$ is librating with a libration amplitude of approximately 37{\\deg}. The existence of mean motion resonances has important implication for planet formation theories. Our results confirm predictions of models involving planet migration and stochastic forces.

  11. DISCOVERY OF H? EMISSION FROM THE CLOSE COMPANION INSIDE THE GAP OF TRANSITIONAL DISK HD 142527

    SciTech Connect (OSTI)

    Close, L. M.; Follette, K. B.; Males, J. R.; Apai, D.; Morzinski, K.; Rodigas, T. J.; Hinz, P.; Bailey, V.; Puglisi, A.; Xompero, M.; Briguglio, R.; Najita, J.; Weinberger, A. J.

    2014-02-01

    We utilized the new high-order 585 actuator Magellan Adaptive Optics system (MagAO) to obtain very high-resolution visible light images of HD 142527 with MagAO's VisAO science camera. In the median seeing conditions of the 6.5 m Magellan telescope (0.''5–0.''7), we find MagAO delivers 24%-19% Strehl at H? (0.656 ?m). We detect a faint companion (HD 142527B) embedded in this young transitional disk system at just 86.3 ± 1.9 mas (?12 AU) from the star. The companion is detected in both H? and a continuum filter (?mag = 6.33 ± 0.20 mag at H? and 7.50 ± 0.25 mag in the continuum filter). This provides confirmation of the tentative companion discovered by Biller and co-workers with sparse aperture masking at the 8 m Very Large Telescope. The H? emission from the ?0.25 solar mass companion (EW = 180 Å) implies a mass accretion rate of ?5.9 × 10{sup –10} M {sub sun} yr{sup –1} and a total accretion luminosity of 1.2% L {sub sun}. Assuming a similar accretion rate, we estimate that a 1 Jupiter mass gas giant could have considerably better (50-1000×) planet/star contrasts at H? than at the H band (COND models) for a range of optical extinctions (3.4-0 mag). We suggest that ?0.5-5 M {sub jup} extrasolar planets in their gas accretion phase could be much more luminous at H? than in the NIR. This is the motivation for our new MagAO GAPplanetS survey for extrasolar planets.

  12. Spectropolarimetry of the Massive Post-Red Supergiants IRC +10420 and HD 179821

    E-Print Network [OSTI]

    M. Patel; R. D. Oudmaijer; J. S. Vink; J. E. Bjorkman; B. Davies; M. A. T. Groenewegen; A. S. Miroshnichenko; J. C. Mottram

    2008-01-06

    We present medium resolution spectropolarimetry and long term photo-polarimetry of two massive post-red supergiants, IRC +10420 and HD 179821. The data provide new information on their circumstellar material as well as their evolution. In IRC +10420, the polarization of the Halpha line is different to that of the continuum, which indicates that the electron-scattering region is not spherically symmetric. The observed long term changes in the polarimetry can be associated with an axi-symmetric structure, along the short axis of the extended reflection nebulosity. Long term photometry reveals that the star increased in temperature until the mid-nineties, after which the photospheric flux in the optical levelled off. As the photometric changes are mostly probed in the red, they do not trace high stellar temperatures sensitively. And so, it is not obvious whether the star has halted its increase in temperature or not. For HD 179821 we find no polarization effects across any absorption or emission lines, but observe very large polarization changes of order 5% over 15 years. Unexpectedly, during the same period, the optical photometry displayed modest variability at the 0.2 magnitude level. Several explanations for this puzzling fact are discussed. Most of which, involving asymmetries in the circumstellar material, seem to fail as there is no evidence for the presence of hot, dusty material close to the star. Alternatively, the variations can be explained by the presence of a non-radially pulsating photosphere. Changes in the photometry hint at an increase in temperature corresponding to a change through two spectral subclasses over the past ten years.

  13. HD 106906 b: A PLANETARY-MASS COMPANION OUTSIDE A MASSIVE DEBRIS DISK

    SciTech Connect (OSTI)

    Bailey, Vanessa; Reiter, Megan; Morzinski, Katie; Males, Jared; Su, Kate Y. L.; Hinz, Philip M.; Stark, Daniel; Close, Laird M.; Follette, Katherine B.; Rodigas, Timothy; Meshkat, Tiffany; Kenworthy, Matthew; Mamajek, Eric; Briguglio, Runa; Puglisi, Alfio; Xompero, Marco; Weinberger, Alycia J.

    2014-01-01

    We report the discovery of a planetary-mass companion, HD 106906 b, with the new Magellan Adaptive Optics (MagAO) + Clio2 system. The companion is detected with Clio2 in three bands: J, K{sub S} , and L', and lies at a projected separation of 7.''1 (650 AU). It is confirmed to be comoving with its 13 ± 2 Myr F5 host using Hubble Space Telescope Advanced Camera for Surveys astrometry over a time baseline of 8.3 yr. DUSTY and COND evolutionary models predict that the companion's luminosity corresponds to a mass of 11 ± 2 M {sub Jup}, making it one of the most widely separated planetary-mass companions known. We classify its Magellan/Folded-Port InfraRed Echellette J/H/K spectrum as L2.5 ± 1; the triangular H-band morphology suggests an intermediate surface gravity. HD 106906 A, a pre-main-sequence Lower Centaurus Crux member, was initially targeted because it hosts a massive debris disk detected via infrared excess emission in unresolved Spitzer imaging and spectroscopy. The disk emission is best fit by a single component at 95 K, corresponding to an inner edge of 15-20 AU and an outer edge of up to 120 AU. If the companion is on an eccentric (e > 0.65) orbit, it could be interacting with the outer edge of the disk. Close-in, planet-like formation followed by scattering to the current location would likely disrupt the disk and is disfavored. Furthermore, we find no additional companions, though we could detect similar-mass objects at projected separations >35 AU. In situ formation in a binary-star-like process is more probable, although the companion-to-primary mass ratio, at <1%, is unusually small.

  14. GRANULATION SIGNATURES IN THE SPECTRUM OF THE VERY METAL-POOR RED GIANT HD 122563

    SciTech Connect (OSTI)

    RamIrez, I. [Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Collet, R.; Asplund, M. [Max Planck Institut fuer Astrophysik, Postfach 1317, 85741 Garching (Germany); Lambert, D. L. [McDonald Observatory and Department of Astronomy, University of Texas, Austin, TX 78712-0259 (United States); Allende Prieto, C. [Instituto de Astrofisica de Canarias, 38205, La Laguna, Tenerife (Spain)

    2010-12-20

    A very high resolution (R = {lambda}/{Delta}{lambda} = 200, 000), high signal-to-noise ratio (S/N {approx_equal} 340) blue-green spectrum of the very metal-poor ([Fe/H] {approx_equal} -2.6) red giant star HD 122563 has been obtained by us at McDonald Observatory. We measure the asymmetries and core wavelengths of a set of unblended Fe I lines covering a wide range of line strength. Line bisectors exhibit the characteristic C-shape signature of surface convection (granulation) and they span from about 100 m s{sup -1} in the strongest Fe I features to 800 m s{sup -1} in the weakest ones. Core wavelength shifts range from about -100 to -900 m s{sup -1}, depending on line strength. In general, larger blueshifts are observed in weaker lines, but there is increasing scatter with increasing residual flux. Assuming local thermodynamic equilibrium (LTE), we synthesize the same set of spectral lines using a state-of-the-art three-dimensional (3D) hydrodynamic simulation for a stellar atmosphere of fundamental parameters similar to those of HD 122563. We find good agreement between model predictions and observations. This allows us to infer an absolute zero point for the line shifts and radial velocity. Moreover, it indicates that the structure and dynamics of the simulation are realistic, thus providing support to previous claims of large 3D-LTE corrections to elemental abundances and fundamental parameters of very metal-poor red giant stars obtained with standard 1D-LTE spectroscopic analyses, as suggested by the hydrodynamic model used here.

  15. Study of the generalized quantum isotonic nonlinear oscillator potential

    E-Print Network [OSTI]

    Nasser Saad; Richard L. Hall; Hakan Ciftci; Ozlem Yesiltas

    2011-04-13

    We study the generalized quantum isotonic oscillator Hamiltonian given by H=-d^2/dr^2+l(l+1)/r^2+w^2r^2+2g(r^2-a^2)/(r^2+a^2)^2, g>0. Two approaches are explored. A method for finding the quasi-polynomial solutions is presented, and explicit expressions for these polynomials are given, along with the conditions on the potential parameters. By using the asymptotic iteration method we show how the eigenvalues of this Hamiltonian for arbitrary values of the parameters g, w and a may be found to high accuracy.

  16. State-resolved differential and integral cross sections for the reaction HD2\\HD,,v 3,j 07...D at 1.64 eV collision energy

    E-Print Network [OSTI]

    at 1.64 eV collision energy Brian D. Bean,a) James D. Ayers, Fe´lix Ferna´ndez-Alonso,b) and Richard N D2 HD(v 3,j 0­7) D at 1.64 0.05 eV collision energy. Although the integral cross sections do measurements of the hydro- gen exchange reaction are crucial to the understanding of this ``simplest'' of all

  17. Integral rate constant measurements of the reaction H +D2O HD(v, David E. Adelman, Stephen V. Filseth, and Richard N. Zare

    E-Print Network [OSTI]

    Integral rate constant measurements of the reaction H +D2O HD(v, j)+OD David E. Adelman, Stephen V://jcp.aip.org/about/rights_and_permissions #12;Integral rate constant measurements of the reaction H +0 20 -- HO(v', j')+00 David E. Adelman atoms were generated by UV pho- tolysis of HI in the intersection volume, and the HD product

  18. Measurement of the state-specific differential cross section for the H D2~HD(v 4, J 3) D reaction at a collision energy

    E-Print Network [OSTI]

    Zare, Richard N.

    . The photolysis of HI at 212.8 nm initiates the H D2 reaction. The HD v 4, J 3 velocity distribution is determined resonance VSDR ,16 velocity-aligned photo- fragment dynamics,17 and photoinitiated bulb reactions.22 It hasMeasurement of the state-specific differential cross section for the H D2~HD(v 4, J 3) D reaction

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

    SciTech Connect (OSTI)

    Wood, M. P.; Lawler, J. E.; Sneden, C.; Cowan, J. J. E-mail: jelawler@wisc.edu E-mail: cowan@nhn.ou.edu

    2013-10-01

    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.

  20. Assignment of resonances in dissociative recombination of HD+ ions: high-resolution measurements compared with accurate computations

    E-Print Network [OSTI]

    Tamo, F O Waffeu; Motapon, O; Altevogt, S; Andrianarijaona, V M; Grieser, M; Lammich, L; Lestinsky, M; Motsch, M; Nevo, I; Novotny, S; Orlov, D A; Pedersen, H B; Schwalm, D; Sprenger, F; Urbain, X; Weigel, U; Wolf, A; Schneider, I F

    2011-01-01

    The collision-energy resolved rate coefficient for dissociative recombination of HD+ ions in the vibrational ground state is measured using the photocathode electron target at the heavy-ion storage ring TSR. Rydberg resonances associated with ro-vibrational excitation of the HD+ core are scanned as a function of the electron collision energy with an instrumental broadening below 1 meV in the low-energy limit. The measurement is compared to calculations using multichannel quantum defect theory, accounting for rotational structure and interactions and considering the six lowest rotational energy levels as initial ionic states. Using thermal equilibrium level populations at 300 K to approximate the experimental conditions, close correspondence between calculated and measured structures is found up to the first vibrational excitation threshold of the cations near 0.24 eV. Detailed assignments, including naturally broadened and overlapping Rydberg resonances, are performed for all structures up to 0.024 eV. Resona...

  1. A high-precision search for magnetic field oscillations in the roAp star HD 24712

    E-Print Network [OSTI]

    O. Kochukhov; G. A. Wade

    2007-02-28

    We have obtained a time series of 81 high-cadence circular polarization observations of the rapidly oscillating Ap star HD 24712 with the new ESPaDOnS spectropolarimeter at CFHT. We used the high-S/N, high-resolution Stokes I and V spectra to investigate possible variation of the mean longitudinal field over the pulsation cycle in this roAp star. Our multiline magnetic field and radial velocity measurements utilized 143 spectral lines of rare-earth elements, attaining precision better than 13 G and 19 m/s, respectively. A multiperiodic radial velocity variation with an amplitude of 40-136 m/s is clearly detected at the known pulsation frequencies of HD 24712. At the same time, no evidence for pulsational changes of the magnetic field can be found. We derive a 3sigma upper limit of 10 G, or about 1% of the mean longitudinal field strength, for magnetic field oscillations in the upper atmosphere of HD 24712. The absence of detectable pulsational variability of the magnetic field provides a valuable constraint for the interaction between pulsations and magnetic field in roAp stars and is compatible with the recent predictions of detailed theoretical models of stellar magnetoacoustic oscillations.

  2. Abundance analysis, spectral variability, and search for the presence of a magnetic field in the typical PGa star HD19400

    E-Print Network [OSTI]

    Hubrig, S; Gonzalez, J F; Carroll, T A; Ilyin, I; Schöller, M; Drake, N A; Korhonen, H; Briquet, M

    2014-01-01

    The aim of this study is to carry out an abundance determination, to search for spectral variability and for the presence of a weak magnetic field in the typical PGa star HD19400. High-resolution, high signal-to-noise HARPS spectropolarimetric observations of HD19400 were obtained at three different epochs in 2011 and 2013. For the first time, we present abundances of various elements determined using an ATLAS12 model, including the abundances of a number of elements not analysed by previous studies, such as Ne I, Ga II, and Xe II. Several lines of As II are also present in the spectra of HD19400. To study the variability, we compared the behaviour of the line profiles of various elements. We report on the first detection of anomalous shapes of line profiles belonging to Mn and Hg, and the variability of the line profiles belonging to the elements Hg, P, Mn, Fe, and Ga. We suggest that the variability of the line profiles of these elements is caused by their non-uniform surface distribution, similar to the pr...

  3. Discovery of a magnetic field in the CoRoT hybrid B-type pulsator HD 43317

    E-Print Network [OSTI]

    Briquet, M; Leroy, B; Pápics, P I

    2013-01-01

    A promising way of testing the impact of a magnetic field on internal mixing (core overshooting, internal rotation) in main-sequence B-type stars is to perform asteroseismic studies of a sample of magnetic pulsators. The CoRoT satellite revealed that the B3IV star HD 43317 is a hybrid SPB/beta Cep-type pulsator that has a wealth of pulsational constraints on which one can perform a seismic modelling, in particular, probing the extent of its convective core and mixing processes. Moreover, indirect indicators of a magnetic field in the star were observed: rotational modulation due to chemical or temperature spots and X-ray emission. Our goal was to directly investigate the field in HD 43317 and, if it is magnetic, to characterise it. We collected data with the Narval spectropolarimeter installed at TBL (T\\'elescope Bernard Lyot, Pic du Midi, France) and applied the least-squares deconvolution technique to measure the circular polarisation of the light emitted from HD 43317. We modelled the longitudinal field me...

  4. Inner disk clearing around the Herbig Ae star HD\\,139614: Evidence for a planet-induced gap ?

    E-Print Network [OSTI]

    Matter, A; Augereau, J -C; Kluska, J; Crida, A; Carmona, A; Gonzalez, J F; Thi, W F; Bouquin, J -B Le; Olofsson, J; Lopez, B

    2015-01-01

    Spatially resolving the inner dust cavity of the transitional disks is a key to understanding the connection between planetary formation and disk dispersal. The disk around the Herbig star HD 139614 is of particular interest since it presents a pretransitional nature with an au-sized gap, in the dust, that was spatially resolved by mid-IR interferometry. Using new NIR interferometric observations, we aim to characterize the 0.1-10~au region of the HD~139614 disk further and identify viable mechanisms for the inner disk clearing. We report the first multiwavelength radiative transfer modeling of the interferometric data acquired on HD~139614 with PIONIER, AMBER, and MIDI, complemented by Herschel/PACS photometries. We confirm a gap structure in the um-sized dust, extending from about 2.5 au to 6 au, and constrained the properties of the inner dust component: e.g., a radially increasing surface density profile, and a depletion of 10^3 relative to the outer disk. Since self-shadowing and photoevaporation appears...

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

    E-Print Network [OSTI]

    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

    2007-05-07

    "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.

  6. Detailed structure of the outer disk around HD 169142 with polarized light in H-band

    E-Print Network [OSTI]

    Momose, Munetake; Fukagawa, Misato; Muto, Takayuki; Takeuchi, Taku; Hashimoto, Jun; Honda, Mitsuhiko; Kudo, Tomoyuki; Okamoto, Yoshiko K; Kanagawa, Kazuhiro D; Tanaka, Hidekazu; Grady, Carol A; Sitko, Michael L; Akiyama, Eiji; Currie, Thayne; Follette, Katherine B; Mayama, Satoshi; Kusakabe, Nobuhiko; Abe, Lyu; Brandner, Wolfgang; Brandt, Timothy D; Carson, Joseph C; Egner, Sebastian; Feldt, Markus; Goto, Miwa; Guyon, Olivier; Hayano, Yutaka; Hayashi, Masahiko; Hayashi, Saeko S; Henning, Thomas; Hodapp, Klaus W; Ishii, Miki; Iye, Masanori; Janson, Markus; Kandori, Ryo; Knapp, Gillian R; Kuzuhara, Masayuki; Kwon, Jungmi; Matsuo, Taro; McElwain, Michael W; Miyama, Shoken; Morino, Jun-Ichi; Moro-Martin, Amaya; Nishimura, Tetsuo; Pyo, Tae-Soo; Serabyn, Eugene; Suenaga, Takuya; Suto, Hiroshi; Suzuki, Ryuji; Takahashi, Yasuhiro H; Takami, Michihiro; Takato, Naruhisa; Terada, Hiroshi; Thalmann, Christian; Tomono, Daigo; Turner, Edwin L; Watanabe, Makoto; Wisniewski, John; Yamada, Toru; Takami, Hideki; Usuda, Tomonori; Tamura, Motohide

    2015-01-01

    Coronagraphic imagery of the circumstellar disk around HD 169142 in H-band polarized intensity (PI) with Subaru/HiCIAO is presented. The emission scattered by dust particles at the disk surface in 0.2" power-law distribution, in which the PIs in r=29-52 AU and r=81.2-145 AU respectively show r^{-3}-dependence. These two power-law regions are connected smoothly with a transition zone (TZ), exhibiting an apparent gap in r=40-70 AU. The PI in the inner power-law region shows a deep minimum whose location seems to coincide with the point source at \\lambda = 7 mm. This can be regarded as another sign of a protoplanet in TZ. The observed radial profile of the PI is reproduced by a minimally flaring disk with an irregular surface density distribution or with an irregular temperature distribution or with the combination of both. The depletion factor of surface density in the inner...

  7. A four-planet system orbiting the K0V star HD 141399

    SciTech Connect (OSTI)

    Vogt, Steven S.; Rivera, Eugenio J.; Kibrick, Robert; Burt, Jennifer; Hanson, Russell; Laughlin, Gregory [UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States); Butler, R. Paul [Department of Terrestrial Magnetism, Carnegie Institute of Washington, Washington, DC 20015 (United States); Meschiari, Stefano [McDonald Observatory, University of Texas at Austin, Austin, TX 78752 (United States); Henry, Gregory W. [Center of Excellence in Information Systems, Tennessee State University, Nashville, TN 37209 (United States)

    2014-06-01

    We present precision radial velocity (RV) data sets from Keck-HIRES and from Lick Observatory's new Automated Planet Finder Telescope and Levy Spectrometer on Mt. Hamilton that reveal a multiple-planet system orbiting the nearby, slightly evolved, K-type star HD 141399. Our 91 observations over 10.5 yr suggest the presence of four planets with orbital periods of 94.35, 202.08, 1070.35, and 3717.35 days and minimum masses of 0.46, 1.36, 1.22, and 0.69 M{sub J} , respectively. The orbital eccentricities of the three inner planets are small, and the phase curves are well sampled. The inner two planets lie just outside the 2:1 resonance, suggesting that the system may have experienced dissipative evolution during the protoplanetary disk phase. The fourth companion is a Jupiter-like planet with a Jupiter-like orbital period. Its orbital eccentricity is consistent with zero, but more data will be required for an accurate eccentricity determination.

  8. The continuous period search method and its application to the young solar analogue HD 116956

    E-Print Network [OSTI]

    Lehtinen, J; Hackman, T; Henry, P Kajatkari G W

    2010-01-01

    Aims: We formulate an improved time series analysis method for the analysis of photometry of active stars. This new Continuous Period Search (CPS) method is applied to 12 years of V band photometry of the young solar analogue HD 116956 (NQ UMa). Methods: The new method is developed from the previous Three Stage Period Analysis (TSPA) method. Our improvements are the use of a sliding window in choosing the modelled datasets, a criterion applied to select the best model for each dataset and the computation of the time scale of change of the light curve. We test the performance of CPS with simulated and real data. Results: The CPS has a much improved time resolution which allows us to better investigate fast evolution of stellar light curves. We can also separate between the cases when the data is best described by periodic (i.e. rotational modulation of brightness) and aperiodic (e.g. constant brightness) models. We find, however, that the performance of the CPS has certain limitations. It does not determine th...

  9. Cross-correlation in four dimensions: Application to the quadruple-lined spectroscopic system HD 110555

    E-Print Network [OSTI]

    Guillermo Torres; David W. Latham; R. P. Stefanik

    2007-03-12

    We develop a technique to measure radial velocities of stars from spectra that present four sets of lines. The algorithm is an extension of the two-dimensional cross-correlation method TODCOR to four dimensions. It computes the correlation of the observed spectrum against a combination of four templates with all possible shifts, and allows also for the derivation of the light ratios of the components. After testing the algorithm and demonstrating its ability to measure Doppler shifts accurately even under conditions of heavy line blending, we apply it to the case of the quadruple-lined system HD 110555. The primary and secondary components of this previously known visual binary (separation about 0.4 arcsec) are each shown to be double-lined spectroscopic binaries with periods of 57 days and 76 days, respectively, making the system a hierarchical quadruple. The secondary in the 76-day subsystem contributes only 2.5% to the total light, illustrating the ability of the method to measure velocities of very faint components.

  10. Test Results for HD1, a 16 Tesla Nb3Sn Dipole Magnet

    SciTech Connect (OSTI)

    Lietzke, A.F.; Bartlett, S.; Bish, P.; Caspi, S.; Chiesa, L.; Dietderich, D.; Ferracin, P.; Gourlay, S.A.; Goli, M.; Hafalia, R.R.; Higley, H.; Hannaford, R.; Lau, W.; Liggens, N.; Mattafirri, S.; McInturff, A.; Nyman, M.; Sabbi, G.; Scanlan, R.; Swanson, J.

    2003-10-01

    The Superconducting Magnet Group at Lawrence Berkeley National Laboratory has been developing the technology for using brittle superconductor in high-field accelerator magnets. HD1, the latest in a series of magnets, contains two, double-layer Nb{sub 3}Sn flat racetrack coils. This single-bore dipole configuration, using the highest performance conductor available, was designed and assembled for a 16 tesla conductor/structure/pre-stress proof-of-principle. With the combination of brittle conductor and high Lorentz stress, considerable care was taken to predict the magnet's mechanical responses to pre-stress, cool-down, and excitation. Subsequent cold testing satisfied expectations: Training started at 13.6 T, 83% of 'short-sample', achieved 90% in 10 quenches, and reached its peak bore field (16 T) after 19 quenches. The average plateau, {approx}92% of 'short-sample', appeared to be limited by 'stick-slip' conductor motions, consistent with the 16.2 T conductor 'lift-off' pre-stress that was chosen for this first test. Some lessons learned and some implications for future conductor and magnet technology development are presented and discussed.

  11. Low-temperature chemistry between water and hydroxyl radicals: H/D isotopic effects

    E-Print Network [OSTI]

    Lamberts, T; Puletti, F; Ioppolo, S; Cuppen, H M; Linnartz, H

    2015-01-01

    Sets of systematic laboratory experiments are presented -- combining Ultra High Vacuum cryogenic and plasma-line deposition techniques -- that allow us to compare H/D isotopic effects in the reaction of H2O (D2O) ice with the hydroxyl radical OD (OH). The latter is known to play a key role as intermediate species in the solid-state formation of water on icy grains in space. The main finding of our work is that the reaction H2O + OD --> OH + HDO occurs and that this may affect the HDO/H2O abundances in space. The opposite reaction D2O + OH --> OD + HDO is much less effective, and also given the lower D2O abundances in space not expected to be of astronomical relevance. The experimental results are extended to the other four possible reactions between hydroxyl and water isotopes and are subsequently used as input for Kinetic Monte Carlo simulations. This way we interpret our findings in an astronomical context, qualitatively testing the influence of the reaction rates.

  12. Revealing asymmetries in the HD 181327 debris disk: A recent massive collision or interstellar medium warping

    SciTech Connect (OSTI)

    Stark, Christopher C.; Kuchner, Marc J.; Schneider, Glenn; Weinberger, Alycia J.; Debes, John H.; Grady, Carol A.; Jang-Condell, Hannah

    2014-07-01

    New multi-roll coronagraphic images of the HD 181327 debris disk obtained using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope reveal the debris ring in its entirety at high signal-to-noise ratio and unprecedented spatial resolution. We present and apply a new multi-roll image processing routine to identify and further remove quasi-static point-spread function-subtraction residuals and quantify systematic uncertainties. We also use a new iterative image deprojection technique to constrain the true disk geometry and aggressively remove any surface brightness asymmetries that can be explained without invoking dust density enhancements/deficits. The measured empirical scattering phase function for the disk is more forward scattering than previously thought and is not well-fit by a Henyey-Greenstein function. The empirical scattering phase function varies with stellocentric distance, consistent with the expected radiation pressured-induced size segregation exterior to the belt. Within the belt, the empirical scattering phase function contradicts unperturbed debris ring models, suggesting the presence of an unseen planet. The radial profile of the flux density is degenerate with a radially varying scattering phase function; therefore estimates of the ring's true width and edge slope may be highly uncertain. We detect large scale asymmetries in the disk, consistent with either the recent catastrophic disruption of a body with mass >1% the mass of Pluto, or disk warping due to strong interactions with the interstellar medium.

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

    SciTech Connect (OSTI)

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

    2014-01-01

    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.

  14. Powertrain Controls Optimization for HD Hybrid Line Haul Trucks - FY2014 Annual Report

    SciTech Connect (OSTI)

    Smith, David E.

    2014-12-01

    This is a vehicle system level project, encompassing analytical modeling and supervisory controls development as well as experimental verification/validation testing at the component, powertrain, and full vehicle system level. This project supports the goal of petroleum consumption reduction for medium and heavy trucks through the development of advanced hybrid technologies and control systems. VSST has invested previously in R&D to support hybrid energy storage systems (Li-ion plus ultra-caps) for light duty, passenger car applications. This research will be extended to the MD and HD sector where current battery technology is not mature enough to handle the substantial regenerative braking power levels these trucks are capable of producing. With this hybrid energy storage system, substantial gains in overall vehicle efficiency are possible. In addition, advanced combustion technologies, such as RCCI, will be implemented into an advanced hybrid powertrain for a Class 8 line haul application. This powertrain, leveraged from other VSST work (Meritor, a current ORNL/VSST partner), is ideal for taking advantage of the benefits of RCCI operation due to its series hybrid mode of operation. Emissions control is also a focus of this project, especially due to the fact that RCCI creates a low temperature exhaust stream that must addressed.

  15. Sun-Like Magnetic Cycles in the Rapidly-Rotating Young Solar Analog HD 30495

    E-Print Network [OSTI]

    Egeland, Ricky; Hall, Jeffrey C; Henry, Gregory W

    2015-01-01

    A growing body of evidence suggests that multiple dynamo mechanisms can drive magnetic variability on different timescales, not only in the Sun but also in other stars. Many solar activity proxies exhibit a quasi-biennial ($\\sim$2 year) variation, which is superimposed upon the dominant 11 year cycle. A well-characterized stellar sample suggests at least two different relationships between rotation period and cycle period, with some stars exhibiting long and short cycles simultaneously. Within this sample, the solar cycle periods are typical of a more rapidly rotating star, implying that the Sun might be in a transitional state or that it has an unusual evolutionary history. In this work, we present new and archival observations of dual magnetic cycles in the young solar analog HD 30495, an $\\sim$1 Gyr-old G1.5V star with a rotation period near 11 days. This star falls squarely on the relationships established by the broader stellar sample, with short-period variations at $\\sim$1.7 years and a long cycle of $...

  16. Simulation and control of a HD diesel engine equipped with new EGR technology

    SciTech Connect (OSTI)

    Dekker, H.J.; Sturm, W.L.

    1996-09-01

    A dynamic model of a Heavy Duty (HD) turbocharged and aftercooled diesel engine was developed. The engine was equipped with high pressure diesel injection, a Variable Geometry Turbine (VGT) and an Exhaust Gas Recirculation (EGR) system. This engine was targeted at meeting EURO4 emission requirements. The final emission results were 2.4 g/k Wh NO{sub x} and 0.107 g/kWh particulates for the European 13 mode test. Better than 3.0 g/k Wh NO{sub x} and 0.10 g/k Wh particulates are expected to be characteristic EURO4 emission requirements (approximate year of implementation is 2004). In the design of the EGR system the model provided initial assessments of the properties of this system. Associated engine and turbocharger behavior as well as optimal control strategies were predicted. A transient engine control algorithm was developed using the dynamic engine model. The VGT is closed loop controlled and EGR is shut off during a short time after a load increase. The simulation results were confirmed by actual measurements, demonstrating acceptable transient behavior.

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

    SciTech Connect (OSTI)

    Winn, Joshua N.; Howard, Andrew W.; Marcy, Geoffrey W.; Johnson, John Asher; Gazak, J. Zachary; Starkey, Donn; Ford, Eric B.; Colon, Knicole D.; Reyes, Francisco; Nortmann, Lisa; Dreizler, Stefan; Odewahn, Stephen; Welsh, William F.; Kadakia, Shimonee; Vanderbei, Robert J.; Adams, Elisabeth R.; Lockhart, Matthew; Crossfield, Ian J.; Valenti, Jeff A.; Dantowitz, Ronald

    2009-10-01

    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 hr and allowing more robust determinations of the system parameters. Keck spectra obtained at midtransit exhibit an anomalous blueshift, giving definitive evidence that the stellar spin axis and planetary orbital axis are misaligned. The Keck data show that the projected spin-orbit angle lambda is between 32 deg. and 87 deg. with 68.3% confidence and between 14 deg. and 142 deg. with 99.73% confidence. Thus, the orbit of this planet is not only highly eccentric (e = 0.93) but is also tilted away from the equatorial plane of its parent star. A large tilt had been predicted, based on the idea that the planet's eccentric orbit was caused by the Kozai mechanism. Independently of the theory, it is worth noting that all three exoplanetary systems with known spin-orbit misalignments have massive planets on eccentric orbits, suggesting that those systems migrate through a different channel than lower mass planets on circular orbits.

  18. IMPROVED log(gf) VALUES FOR LINES OF Ti I AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937 (ACCURATE TRANSITION PROBABILITIES FOR Ti I)

    SciTech Connect (OSTI)

    Lawler, J. E.; Guzman, A.; Wood, M. P.; Sneden, C.; Cowan, J. J. E-mail: adrianaguzman2014@u.northwestern.edu E-mail: chris@verdi.as.utexas.edu

    2013-04-01

    New atomic transition probability measurements for 948 lines of Ti I are reported. Branching fractions from Fourier transform spectra and from spectra recorded using a 3 m echelle spectrometer are combined with published radiative lifetimes from laser-induced fluorescence measurements to determine these transition probabilities. Generally good agreement is found in comparisons to the NIST Atomic Spectra Database. The new Ti I data are applied to re-determine the Ti abundance in the photospheres of the Sun and metal-poor star HD 84937 using many lines covering a range of wavelength and excitation potential to explore possible non-local thermal equilibrium effects. The variation of relative Ti/Fe abundance with metallicity in metal-poor stars observed in earlier studies is supported in this study.

  19. Hubble space telescope near-ir transmission spectroscopy of the super-Earth HD 97658B

    SciTech Connect (OSTI)

    Knutson, Heather A.; Dragomir, Diana; Kreidberg, Laura; Bean, Jacob L.; Kempton, Eliza M.-R.; McCullough, P. R.; Fortney, Jonathan J.; Gillon, Michael; Homeier, Derek; Howard, Andrew W.

    2014-10-20

    Recent results from the Kepler mission indicate that super-Earths (planets with masses between 1-10 times that of the Earth) are the most common kind of planet around nearby Sun-like stars. These planets have no direct solar system analogue, and are currently one of the least well-understood classes of extrasolar planets. Many super-Earths have average densities that are consistent with a broad range of bulk compositions, including both water-dominated worlds and rocky planets covered by a thick hydrogen and helium atmosphere. Measurements of the transmission spectra of these planets offer the opportunity to resolve this degeneracy by directly constraining the scale heights and corresponding mean molecular weights of their atmospheres. We present Hubble Space Telescope near-infrared spectroscopy of two transits of the newly discovered transiting super-Earth HD 97658b. We use the Wide Field Camera 3's (WFC3) scanning mode to measure the wavelength-dependent transit depth in 30 individual bandpasses. Our averaged differential transmission spectrum has a median 1? uncertainty of 23 ppm in individual bins, making this the most precise observation of an exoplanetary transmission spectrum obtained with WFC3 to date. Our data are inconsistent with a cloud-free solar metallicity atmosphere at the 10? level. They are consistent at the 0.4? level with a flat line model, as well as effectively flat models corresponding to a metal-rich atmosphere or a solar metallicity atmosphere with a cloud or haze layer located at pressures of 10 mbar or higher.

  20. Modeling self-subtraction in angular differential imaging: Application to the HD 32297 debris disk

    SciTech Connect (OSTI)

    Esposito, Thomas M.; Fitzgerald, Michael P.; Graham, James R.; Kalas, Paul

    2014-01-01

    We present a new technique for forward-modeling self-subtraction of spatially extended emission in observations processed with angular differential imaging (ADI) algorithms. High-contrast direct imaging of circumstellar disks is limited by quasi-static speckle noise, and ADI is commonly used to suppress those speckles. However, the application of ADI can result in self-subtraction of the disk signal due to the disk's finite spatial extent. This signal attenuation varies with radial separation and biases measurements of the disk's surface brightness, thereby compromising inferences regarding the physical processes responsible for the dust distribution. To compensate for this attenuation, we forward model the disk structure and compute the form of the self-subtraction function at each separation. As a proof of concept, we apply our method to 1.6 and 2.2 ?m Keck adaptive optics NIRC2 scattered-light observations of the HD 32297 debris disk reduced using a variant of the 'locally optimized combination of images' algorithm. We are able to recover disk surface brightness that was otherwise lost to self-subtraction and produce simplified models of the brightness distribution as it appears with and without self-subtraction. From the latter models, we extract radial profiles for the disk's brightness, width, midplane position, and color that are unbiased by self-subtraction. Our analysis of these measurements indicates a break in the brightness profile power law at r ? 110 AU and a disk width that increases with separation from the star. We also verify disk curvature that displaces the midplane by up to 30 AU toward the northwest relative to a straight fiducial midplane.

  1. Spectroscopic and photometric analysis of the early-type spectroscopic binary HD 161853 in the centre of an H II region

    E-Print Network [OSTI]

    Gamen, R; Barbá, R H; Arias, J I; Apellániz, J Maíz; Walborn, N R; Sota, A; Alfaro, E J

    2015-01-01

    We study the O-type star HD 161853, which has been noted as a probable double-lined spectroscopic binary system. We secured high-resolution spectra of HD 161853 during the past nine years. We separated the two components in the system and measured their respective radial velocities for the first time. We confirm that HD 161853 is an $\\sim$1 Ma old binary system consisting of an O8 V star ($M_{\\rm A,RV} \\geq 22$ M$_\\odot$) and a B1--3 V star ($M_{\\rm B,RV} \\geq 7.2$ M$_\\odot$) at about 1.3 kpc. From the radial velocity curve, we measure an orbital period $P$ = 2.66765$\\pm$0.00001 d and an eccentricity $e$ = 0.121$\\pm$0.007. Its $V$-band light curve is constant within 0.014 mag and does not display eclipses, from which we impose a maximum orbital inclination $i=54$ deg. HD 161853 is probably associated with an H II region and a poorly investigated very young open cluster. In addition, we detect a compact emission region at 50 arcsec to HD 161853 in 22$\\mu$m-WISE and 24$\\mu$m-Spitzer images, which may be identif...

  2. 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]

    Nathan Smith

    2006-11-16

    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.

  3. Constraining the atmospheric composition of the day-night terminators of HD 189733b: Atmospheric retrieval with aerosols

    SciTech Connect (OSTI)

    Lee, Jae-Min; Irwin, Patrick G. J.; Fletcher, Leigh N.; Barstow, Joanna K.; Heng, Kevin

    2014-07-01

    A number of observations have shown that Rayleigh scattering by aerosols dominates the transmission spectrum of HD 189733b at wavelengths shortward of 1 ?m. In this study, we retrieve a range of aerosol distributions consistent with transmission spectroscopy between 0.3-24 ?m that were recently re-analyzed by Pont et al. To constrain the particle size and the optical depth of the aerosol layer, we investigate the degeneracies between aerosol composition, temperature, planetary radius, and molecular abundances that prevent unique solutions for transit spectroscopy. Assuming that the aerosol is composed of MgSiO{sub 3}, we suggest that a vertically uniform aerosol layer over all pressures with a monodisperse particle size smaller than about 0.1 ?m and an optical depth in the range 0.002-0.02 at 1 ?m provides statistically meaningful solutions for the day/night terminator regions of HD 189733b. Generally, we find that a uniform aerosol layer provide adequate fits to the data if the optical depth is less than 0.1 and the particle size is smaller than 0.1 ?m, irrespective of the atmospheric temperature, planetary radius, aerosol composition, and gaseous molecules. Strong constraints on the aerosol properties are provided by spectra at wavelengths shortward of 1 ?m as well as longward of 8 ?m, if the aerosol material has absorption features in this region. We show that these are the optimal wavelengths for quantifying the effects of aerosols, which may guide the design of future space observations. The present investigation indicates that the current data offer sufficient information to constrain some of the aerosol properties of HD189733b, but the chemistry in the terminator regions remains uncertain.

  4. RECOVERY OF THE CANDIDATE PROTOPLANET HD 100546 b WITH GEMINI/NICI AND DETECTION OF ADDITIONAL (PLANET-INDUCED?) DISK STRUCTURE AT SMALL SEPARATIONS

    SciTech Connect (OSTI)

    Currie, Thayne; Kudo, Tomoyuki [NAOJ, Subaru Telescope, 650 N' Aohoku Pl., Hilo, HI 96720 (United States); Muto, Takayuki [Division of Liberal Arts, Kogashin University, 1-24-2, Nishi-Shinjuku, Shinijuku-ku, Tokyo 163-8677 (Japan); Honda, Mitsuhiko [Department of Mathematics and Physics, Kanagawa University, 2946 Tsuchiya, Hiratsuka 259-1293 (Japan); Brandt, Timothy D. [Astrophysics Department, Institute for Advanced Study, Princeton, NJ 08540 (United States); Grady, Carol [Eureka Scientific, 2452 Delmer, Suite 100, Oakland, CA96002 (United States); Fukagawa, Misato [Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043 (Japan); Burrows, Adam [Department of Astrophysical Sciences, Princeton University, 7 Ivy Lane, Princeton, NJ 08544-1001 (United States); Janson, Markus [Stockholm University, SE-106 91 Stockholm (Sweden); Kuzuhara, Masayuki [Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan); McElwain, Michael W. [Exoplanets and Stellar Astrophysics Laboratory, Code 667, Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Follette, Katherine [Department of Astronomy, Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065 (United States); Hashimoto, Jun [H. L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 W. Brooks St Norman, OK 73019 (United States); Henning, Thomas [Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg (Germany); Kandori, Ryo; Kusakabe, Nobuhiko; Morino, Jun-ichi; Nishikawa, Jun [National Astronomical Observatory of Japan, 2-21-1, Osawa, Mitaka, Tokyo 181-8588 (Japan); Kwon, Jungmi; Mede, Kyle, E-mail: currie@naoj.org [Department of Astronomy, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); and others

    2014-12-01

    We report the first independent, second epoch (re-)detection of a directly imaged protoplanet candidate. Using L' high-contrast imaging of HD 100546 taken with the Near-Infrared Coronagraph and Imager on Gemini South, we recover ''HD 100546 b'' with a position and brightness consistent with the original Very Large Telescope/NAos-COnica detection from Quanz et al., although data obtained after 2013 will be required to decisively demonstrate common proper motion. HD 100546 b may be spatially resolved, up to ?12-13 AU in diameter, and is embedded in a finger of thermal IR-bright, polarized emission extending inward to at least 0.''3. Standard hot-start models imply a mass of ?15 M{sub J} . However, if HD 100546 b is newly formed or made visible by a circumplanetary disk, both of which are plausible, its mass is significantly lower (e.g., 1-7 M{sub J} ). Additionally, we discover a thermal IR-bright disk feature, possibly a spiral density wave, at roughly the same angular separation as HD 100546 b but 90° away. Our interpretation of this feature as a spiral arm is not decisive, but modeling analyses using spiral density wave theory implies a wave launching point exterior to ?0.''45 embedded within the visible disk structure: plausibly evidence for a second, hitherto unseen, wide-separation planet. With one confirmed protoplanet candidate and evidence for one to two others, HD 100546 is an important evolutionary precursor to intermediate-mass stars with multiple super-Jovian planets at moderate/wide separations like HR 8799.

  5. A Ring of Warm Dust in the HD 32297 Debris Disk

    E-Print Network [OSTI]

    Michael P. Fitzgerald; Paul G. Kalas; James R. Graham

    2007-07-22

    We report the detection of a ring of warm dust in the edge-on disk surrounding HD 32297 with the Gemini-N/MICHELLE mid-infrared imager. Our N'-band image shows elongated structure consistent with the orientation of the scattered-light disk. The Fnu(11.2 um) = 49.9+/-2.1 mJy flux is significantly above the 28.2+/-0.6 mJy photosphere. Subtraction of the stellar point spread function reveals a bilobed structure with peaks 0.5"-0.6" from the star. An analysis of the stellar component of the SED suggests a spectral type later than A0, in contrast to commonly cited literature values. We fit three-dimensional, single-size grain models of an optically thin dust ring to our image and the SED using a Markov chain Monte Carlo algorithm in a Bayesian framework. The best-fit effective grain sizes are submicron, suggesting the same dust population is responsible for the bulk of the scattered light. The inner boundary of the warm dust is located 0.5"-0.7" (~65 AU) from the star, which is approximately cospatial with the outer boundary of the scattered-light asymmetry inward of 0.5". The addition of a separate component of larger, cooler grains that provide a portion of the 60 um flux improves both the fidelity of the model fit and consistency with the slopes of the scattered-light brightness profiles. Previous indirect estimates of the stellar age (~30 Myr) indicate the dust is composed of debris. The peak vertical optical depths in our models (~0.3-1 x 1e-2) imply that grain-grain collisions likely play a significant role in dust dynamics and evolution. Submicron grains can survive radiation pressure blow-out if they are icy and porous. Similarly, the inferred warm temperatures (130-200 K) suggest that ice sublimation may play a role in truncating the inner disk.

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

    E-Print Network [OSTI]

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

    2015-01-01

    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...

  7. On the detection of molecules in the atmosphere of HD 189733b using HST NICMOS transmission spectroscopy

    SciTech Connect (OSTI)

    Swain, Mark R.; Deroo, Pieter; Line, Michael R.

    2014-04-01

    The Hubble Space Telescope/NICMOS transmission spectrum measurements of HD 189733b that suggest the detection of methane (CH{sub 4}) in an exoplanet atmosphere have been a source of significant controversy. With what is probably the best analyzed exoplanet spectroscopy data set to date, different teams, using different methods, have claimed evidence both contradicting and supporting the original findings. Here, we report results from a uniform spectral retrieval analysis of the three independent published spectra together with null hypothesis testing. Based on Bayesian model comparison, we find that two of the three spectra show strong evidence (?3.6?) for the detection of molecular features mainly due to water and methane while the third is consistent with a weak molecular detection at the 2.2? level. We interpret the agreement in the spectral modulation established by previous authors and the atmospheric retrieval results presented here, as a confirmation of the original detection of molecular absorbers in the atmosphere of HD 189733b.

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

    E-Print Network [OSTI]

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

    2004-09-22

    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.

  9. The circumstellar shell of the post-AGB star HD 56126: the $^{12}$CN/$^{13}$CN isotope ratio and fractionation

    E-Print Network [OSTI]

    Eric J. Bakker; David L. Lambert

    1997-11-15

    We have detected circumstellar absorption lines of the $^{12}$CN and $^{13}$CN Violet and Red System in the spectrum of the post-AGB star HD~56126. From a synthetic spectrum analysis, we derive a Doppler broadening parameter of $b=0.51\\pm0.04$ km~s$^{-1}$, $^{12}$CN/$^{13}$CN$=38\\pm2$, and a lower limit of $2000$ on $^{12}$CN/$^{14}$CN and $^{12}$C$^{14}$N/$^{12}$C$^{15}$N. A simple chemical model has been computed of the circumstellar shell surrounding HD~56126 that takes into account the gas-phase ion-molecule reaction between CN and C$^{+}$. From this we infer that this reaction leads to isotopic fractionation of CN. Taking into account the isotopic exchange reaction and the observed $^{12}$CN/$^{13}$CN we find $^{12}$C/$^{13}$C$\\sim 67$ (for $T_{\\rm kin}=25$ K). Our analysis suggests that $^{12}$CN has a somewhat higher rotational temperature than $^{13}$CN: $T_{\\rm rot}=11.5\\pm0.6$ and $8.0\\pm0.6$ K respectively. We identify possible causes for this difference in excitation temperature, among which the $N''$ dependence of the isotopic exchange reaction.

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

    E-Print Network [OSTI]

    Keinan, Ehud

    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

  11. A Reinterpretation of the Mechanism of the Simplest Reaction at an -Hybridized Carbon Atom: H + CD4 f CD3 + HD

    E-Print Network [OSTI]

    Zare, Richard N.

    ,11 we measure the center of mass differential cross-section (DCS) of the CD3()0) products for Ecoll + CD4 f CD3 + HD Jon P. Camden, Hans A. Bechtel, Davida J. Ankeny Brown, Marion R. Martin, Richard N, but the small reaction cross-section has made state-to- state resolved dynamics experiments difficult, and few

  12. MID-INFRARED HIGH-CONTRAST IMAGING OF HD 114174 B: AN APPARENT AGE DISCREPANCY IN A ''SIRIUS-LIKE'' BINARY SYSTEM

    SciTech Connect (OSTI)

    Matthews, Christopher T.; Crepp, Justin R.; Skemer, Andrew; Hinz, Philip M.; Bailey, Vanessa P.; Defrere, Denis; Leisenring, Jarron; Gianninas, Alexandros; Kilic, Mukremin; Skrutskie, Michael; Esposito, Simone; Puglisi, Alfio

    2014-03-10

    We present new observations of the faint ''Sirius-like'' companion discovered to orbit HD 114174. Previous attempts to image HD 114174 B at mid-infrared wavelengths using NIRC2 at Keck have resulted in a non-detection. Our new L'-band observations taken with the Large Binocular Telescope and L/M-band InfraRed Camera recover the companion (?L = 10.15 ± 0.15 mag, ? = 0.''675 ± 0.''016) with a high signal-to-noise ratio (10?). This measurement represents the deepest L' high-contrast imaging detection at subarcsecond separations to date, including extrasolar planets. We confirm that HD 114174 B has near-infrared colors consistent with the interpretation of a cool white dwarf (WD; J – L' = 0.76 ± 0.19 mag, K – L' = 0.64 ± 0.20). New model fits to the object's spectral energy distribution indicate a temperature T {sub eff} = 4260 ± 360 K, surface gravity log g = 7.94 ± 0.03, a cooling age t{sub c} ? 7.8 Gyr, and mass M = 0.54 ± 0.01 M {sub ?}. We find that the cooling ages given by theoretical atmospheric models do not agree with the age of HD 114174 A derived from both isochronological and gyrochronological analyses. We speculate on possible scenarios to explain the apparent age discrepancy between the primary and secondary. HD 114174 B is a nearby benchmark WD that will ultimately enable a dynamical mass estimate through continued Doppler and astrometric monitoring. Efforts to characterize its physical properties in detail will test theoretical atmospheric models and improve our understanding of WD evolution, cooling, and progenitor masses.

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

    E-Print Network [OSTI]

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

    2007-11-08

    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.

  14. NGV fueling station technology program: CNG dispenser development goals. Interim report, February-June 1994

    SciTech Connect (OSTI)

    Svedeman, S.J.; Buckingham, J.C.; Behring, K.A.; McKee, R.J.

    1994-09-01

    The objective of the project is to investigate improvements to the CNG dispensers used at fueling stations. CNG dispensers perform similar functions to gasoline dispensers in that they control the fuel flow, measure the amount of fuel dispensed into the vehicle, and compute the sale amount. The specific areas where improvements are required include: reducing the dispenser cost, improving the dispensed gas flow measurement accuracy, reducing the time required to fill the vehicle, and increasing the level of fill provided by the dispenser control system.

  15. NGV 2 -.I. .1 '"The lim ,lhey arc a changing," even al Michigan Tech. In

    E-Print Network [OSTI]

    · standing alumnus, Gordon C. Trombl y. Gordon's entire career, following his graduation from Mi higan Tech

  16. 3000 vs. 3600 psig NGV on-board storage pressure evaluation

    SciTech Connect (OSTI)

    Biederman, R.; Blazek, C.; Freeman, P. [Institute of Gas Technology, Chicago, IL (United States); Gauthier, S. [Gas Research Inst., Chicago, IL (United States)

    1993-12-31

    The objective of this evaluation is to perform a comprehensive analysis of two on-board storage pressures or natural gas vehicles. The choice of operating pressure is a fairly complicated one, with implications for a variety of refueling station and vehicle cost issues. Furthermore, the benefit of higher storage pressure operation (increased vehicle driving distance) has been poorly understood, both in precision as well as in value. This study will attempt to combine the relevant factors to aid the industry in developing a framework for deciding the merits of higher operating pressure. This study will not attempt to issue a recommendation on whether the additional cost of 3600 psig storage is justifiable, but will establish a model for decision making.

  17. Development of commercial NGV cylinders. Final report, September 1990-August 1991

    SciTech Connect (OSTI)

    Berrisford, R.S.

    1992-02-01

    The state-of-the-art feasibility has been demonstrated for manufacturing and testing large, light-weight CNG cylinders for transit buses. The objective of the program is to establish the viability of this concept over a broad range of sizes and economic issues. To establish the viability of these cylinders, the latest requirements and standards were used in the program. The project included the design of various size tanks with regard to length as well as diameter. Tanks in two sizes were fabricated and submitted to test. The test program was established using the most severe tests from the U.S. and Canadian regulatory agencies. Upon successful completion of these tests, a qualification test report was prepared and submitted to the U.S. Department of Transportation for approval. The results of the program will provide the compressed natural gas vehicle industry with an economically viable, light-weight cylinder for both the original equipment manufacturers and the after market converters. The light-weight results in lower vehicle weight thus better fuel economy.

  18. Is there an NGV technician in the house. [Natural Gas Vehicle

    SciTech Connect (OSTI)

    Donald, R.L.

    1994-09-01

    Passage of the Clean Air Act Amendments in 1990, along with the law's requirements for reducing automotive emissions, meant the climate for alternative-fueled vehicles (AFVs) was set for rapid growth. Two years later, the national Energy Policy Act (EPAct) essentially doubled fleet-conversion requirements and considerably expanded the number of those affected by the mandates. In only four years after passage--1996--EPAct requires 25 percent of all federal and 10 percent of all state fleets to run on alternative fuels. Realizing the importance of developing a properly trained pool of technicians to convert and service AFVs, the nonprofit Alliance for Environmental Education approached A.G.A. with a proposal to set up a national center for AFV training. Enter West Virginia University (WVU) and its National Research Center for Coal and Energy (NRCCE). In October 1992, Congress appropriated a grant to set up such a center and gave oversight

  19. The 1998 NGV lineup: Cars and trucks and vans, oh my!

    SciTech Connect (OSTI)

    NONE

    1997-09-01

    As the 1998 model cars roll off the assembly line, environmentalists and the natural gas industry can take pride in the fact that more new natural gas vehicles (NGVs) have joined the lineup. And more will join the fleet by the beginning of the 1999 model year. Two new 1998 NGVs are bi-fuel versions of Ford Motor Co.`s F-Series pickup truck and Econoline van. With two separate fuel systems, the vehicles can be switched between unleaded gasoline and natural gas while in motion. In addition, Mack Trucks Inc. introduced two refuse truck models in late May. American Gas looks at the lineup for this fall and sees a greater variety of vehicles than ever before, with still more promised before the 1999 season begins.

  20. Evaluation of moisture sensors for NGV fueling station applications. Topical report, November 1994-April 1996

    SciTech Connect (OSTI)

    Rowley, P.F.; Maniquis, V.T.; Hunecke, D.E.; Blazek, C.F.

    1996-08-01

    Moisture content in natural gas has become an important issue for compressed natural gas (CNG) fueling stations. The objective of this project was to evaluate the performance of four hygrometer technologies and identify the most cost effective designs suitable for CNG fueling station applications. The four technologies evaluated were: aluminum oxide, ceramic dewpoint, electrolytic, and silicon chip sensors. The hygrometer performance was evaluated with respect to accuracy, response time, repeatability, operating conditions, maintenance requirements, and cost.

  1. Development of NGV high pressure storage technologies. Final report, September 1992-September 1994

    SciTech Connect (OSTI)

    Taylor, Z.R.

    1995-05-01

    Successful commercialization of natural gas fueled vehicles requires the development of lightweight, low-cost fuel containment vessels. In an effort to reduce vessel weight and cost, composite overwrapped vessels were developed using plastic instead of conventional metal liners. A number of liner materials and composite laminates were evaluated. High performance vessels were fabricated and tested with some success, but failed to meet qualification requirements. The concept and process were validated but modifications to the design would be needed to reliably meet specification requirements.

  2. 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]

    Zare, Richard N.

    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 Brian D. Bean, Fe´lix Ferna´ndez-Alonso, and Richard N pulse that initiates the reaction also detects the HD(V, j) product in a state-specific manner via 2 + 1

  3. Production of excited atomic hydrogen and deuterium from H2, HD and D2 photodissociation This article has been downloaded from IOPscience. Please scroll down to see the full text article.

    E-Print Network [OSTI]

    Gay, Timothy J.

    Production of excited atomic hydrogen and deuterium from H2, HD and D2 photodissociation.1088/0953-4075/44/4/045201 Production of excited atomic hydrogen and deuterium from H2, HD and D2 photodissociation J R Machacek1,2, V M 28 January 2011 Online at stacks.iop.org/JPhysB/44/045201 Abstract We have measured the production

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

    SciTech Connect (OSTI)

    Evans, Thomas M.; Aigrain, Suzanne; Barstow, Joanna K.; Pont, Frederic; Sing, David K.; Desert, Jean-Michel; Knutson, Heather A.; Gibson, Neale; Heng, Kevin; Lecavelier des Etangs, Alain

    2013-08-01

    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.

  5. Commercializing Light-Duty Plug-In/Plug-Out Hydrogen-Fuel-Cell Vehicles:“Mobile Electricity” Technologies, Early California Household Markets, and Innovation Management

    E-Print Network [OSTI]

    Williams, Brett D

    2007-01-01

    NGVs were assigned artificially low NGV ranges. ) found thenatural-gas-vehicle (NGV) commercialization failures duringGas utilities recognized NGV commercialization as an

  6. Commercializing Light-Duty Plug-In/Plug-Out Hydrogen-Fuel-Cell Vehicles: "Mobile Electricity" Technologies, Early California Household Markets, and Innovation Management

    E-Print Network [OSTI]

    Williams, Brett D

    2010-01-01

    NGVs were assigned artificially low NGV ranges. ) found thenatural-gas-vehicle (NGV) commercialization failures duringGas utilities recognized NGV commercialization as an

  7. Commercializing light-duty plug-in/plug-out hydrogen-fuel-cell vehicles: “Mobile Electricity” technologies and opportunities

    E-Print Network [OSTI]

    Williams, Brett D; Kurani, Kenneth S

    2007-01-01

    NGVs were assigned artificially low NGV ranges. ) found thenatural-gas-vehicle (NGV) commercialization failures duringGas utilities recognized NGV commercialization as an

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

    SciTech Connect (OSTI)

    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)

    2011-01-15

    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.

  9. The CoRoT B-type binary HD50230: a prototypical hybrid pulsator with g-mode period and p-mode frequency spacings

    E-Print Network [OSTI]

    Degroote, P; Michel, E; Briquet, M; Pápics, P I; Amado, P; Mathias, P; Poretti, E; Rainer, M; Lombaert, R; Hillen, M; Morel, T; Auvergne, M; Baglin, A; Baudin, F; Catala, C; Samadi, R

    2012-01-01

    B-type stars are promising targets for asteroseismic modelling, since their frequency spectrum is relatively simple. We deduce and summarise observational constraints for the hybrid pulsator, HD50230, earlier reported to have deviations from a uniform period spacing of its gravity modes. The combination of spectra and a high-quality light curve measured by the CoRoT satellite allow a combined approach to fix the position of HD50230 in the HR diagram. To describe the observed pulsations, classical Fourier analysis was combined with short-time Fourier transformations and frequency spacing analysis techniques. Visual spectra were used to constrain the projected rotation rate of the star and the fundamental parameters of the target. In a first approximation, the combined information was used to interpret multiplets and spacings to infer the true surface rotation rate and a rough estimate of the inclination angle. We identify HD50230 as a spectroscopic binary and characterise the two components. We detect the simu...

  10. High-precision CoRoT space photometry and fundamental parameter determination of the B2.5V star HD 48977

    E-Print Network [OSTI]

    Thoul, Anne; Catala, Claude; Aerts, Conny; Morel, Thierry; Briquet, Maryline; Hillen, Michel; Raskin, Gert; Van Winckel, Hans; Auvergne, Michel; Baglin, Annie; Baudin, Frédéric; Michel, Eric

    2012-01-01

    We present the CoRoT light curve of the bright B2.5V star HD 48977 observed during a short run of the mission in 2008, as well as a high-resolution spectrum gathered with the HERMES spectrograph at the Mercator telescope. We use several time series analysis tools to explore the nature of the variations present in the light curve. We perform a detailed analysis of the spectrum of the star to determine its fundamental parameters and its element abundances. We find a large number of high-order g-modes, and one rotationally induced frequency. We find stable low-amplitude frequencies in the p-mode regime as well. We conclude that HD 48977 is a new Slowly Pulsating B star with fundamental parameters found to be Teff = 20000 $\\pm$ 1000 K and log(g)=4.2 $/pm$ 0.1. The element abundances are similar to those found for other B stars in the solar neighbourhood. HD 48977 was observed during a short run of the CoRoT satellite implying that the frequency precision is insufficient to perform asteroseismic modelling of the s...

  11. 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)

    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

    2014-06-01

    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.

  12. Extensive study of HD 25558, a long-period double-lined binary with two SPB components

    E-Print Network [OSTI]

    Sódor, Á; Wright, D J; Neiner, C; Briquet, M; Lampens, P; Dukes, R J; Henry, G W; Williamson, M H; Brunsden, E; Pollard, K R; Cottrell, P L; Maisonneuve, F; Kilmartin, P M; Matthews, J; Kallinger, T; Beck, P G; Kambe, E; Engelbrecht, C A; Czanik, R J; Yang, S; Hashimoto, O; Honda, S; Fu, J N; Castanheira, B; Lehmann, H; Bognár, Zs; Behara, N; Scaringi, S; Van Winckel, H; Menu, J; Lobel, A; Mathias, P; Saesen, S; Vu?kovi?, M

    2013-01-01

    We carried out an extensive observational study of the Slowly Pulsating B (SPB) star, HD 25558. The ~2000 spectra obtained at different observatories, the ground-based and MOST satellite light curves revealed that this object is a double-lined spectroscopic binary with an orbital period of about 9 years. The observations do not allow the inference of an orbital solution. We determined the physical parameters of the components, and found that both lie within the SPB instability strip. Accordingly, both show line-profile variations due to stellar pulsations. Eleven independent frequencies were identified in the data. All the frequencies were attributed to one of the two components based on Pixel-by-pixel variability analysis of the line profiles. Spectroscopic and photometric mode identification was also performed for the frequencies of both stars. These results suggest that the inclination and rotation of the two components are rather different. The primary is a slow rotator with ~6 d period, seen at ~60 deg i...

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

    E-Print Network [OSTI]

    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

    2009-01-01

    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...

  14. Low-amplitude rotational modulation rather than pulsations in the CoRoT B-type supergiant HD 46769

    E-Print Network [OSTI]

    Aerts, C; Catala, C; Neiner, C; Briquet, M; Castro, N; Schmid, V S; Scardia, M; Rainer, M; Poretti, E; Papics, I; Degroote, P; Bloemen, S; Oestensen, R H; Auvergne, M; Baglin, A; Baudin, F; Michel, E; Samadi, R

    2013-01-01

    {We aim to detect and interpret photometric and spectroscopic variability of the bright CoRoT B-type supergiant target HD\\,46769 ($V=5.79$). We also attempt to detect a magnetic field in the target.} {We analyse a 23-day oversampled CoRoT light curve after detrending, as well as spectroscopic follow-up data, by using standard Fourier analysis and Phase Dispersion Minimization methods. We determine the fundamental parameters of the star, as well as its abundances from the most prominent spectral lines. We perform a Monte Carlo analysis of spectropolarimetric data to obtain an upper limit of the polar magnetic field, assumping a dipole field.} {In the CoRoT data, we detect a dominant period of 4.84\\,d with an amplitude of 87\\,ppm, and some of its (sub-)multiples. Given the shape of the phase-folded light curve and the absence of binary motion, we interpret the dominant variability in terms of rotational modulation, with a rotation period of 9.69\\,d. Subtraction of the rotational modulation signal does not revea...

  15. An asteroseismic study of the O9V star HD 46202 from CoRoT space-based photometry

    E-Print Network [OSTI]

    Briquet, M; Baglin, A; Nieva, M F; Degroote, P; Przybilla, N; Noels, A; Schiller, F; Vuckovic, M; Oreiro, R; Smolders, K; Auvergne, M; Baudin, F; Catala, C; Michel, E; Samadi, R

    2011-01-01

    The O9V star HD 46202, which is a member of the young open cluster NGC 2244, was observed by the CoRoT satellite in October/November 2008 during a short run of 34 days. From the very high-precision light curve, we clearly detect beta Cep-like pulsation frequencies with amplitudes of ~0.1 mmag and below. A comparison with stellar models was performed using a chi^2 as a measure for the goodness-of-fit between the observed and theoretically computed frequencies. The physical parameters of our best-fitting models are compatible with the ones deduced spectroscopically. A core overshooting parameter alpha_ov = 0.10 +- 0.05 pressure scale height is required. None of the observed frequencies are theoretically excited with the input physics used in our study. More theoretical work is thus needed to overcome this shortcoming in how we understand the excitation mechanism of pulsation modes in such a massive star. A similar excitation problem has also been encountered for certain pulsation modes in beta Cep stars recentl...

  16. X-ray emission from the double-binary OB-star system QZ Car (HD 93206)

    E-Print Network [OSTI]

    Parkin, E R; Townsley, L K; Pittard, J M; Moffat, A F J; Naze, Y; Rauw, G; Oskinova, L M

    2011-01-01

    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 orbit of systems A (O9.7 I+b2 v, PA = 21 d) and B (O8 III+o9 v, PB = 6 d) 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, characterised by cool, moderate, and hot plasma components at kT ~ 0.2, 0.7, and 2 keV, respectively, and a circumstellar absorption of ~ 0.2 x 10^22 cm-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 ~ 7 x 10^-13 erg s-1 cm-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. ...

  17. Pressure modulated injection and its effect on combustion and emissions of a HD diesel engine

    SciTech Connect (OSTI)

    Erlach, H.; Chmela, F.; Cartellieri, W.; Herzog, P.

    1995-12-31

    The paper describes the concept selection, design and performance of a fuel injection equipment (FIE) which provides high flexibility in shaping the injection rate. With this injection system standard and boot shaped injection rates as well as pilot injections and post injections can be achieved throughout the hole speed and load range. Special emphasis was drawn to realize boot rate shaping by pressure modulation rather than by throttling the fuel flow (i.e.: the system is operated with fully opened needle during the whole injection period and no throttling device limits the fuel flow in front of the nozzle to reduce the injection rate). Initial engine tests on a single cylinder research engine with 2 liter displacement were carried out at one operating point (1,000 rpm, 200 mm{sup 3}/str = 75% of full load fueling). Boot and pilot (split) injection rate shaping strategies are compared to a standard injection without rate shaping. At constant smoke and BSFC the boot injection shows a considerable improvement potential in NOx emissions of up to {minus}14%, or NOx and BSFC can be reduced simultaneously by {minus}9% and {minus}7%, respectively. The results with pilot injection are less promising than the results with boot injection. Furthermore, they are sensitive to pilot timing and to injection pressure as well as fueling during pilot injection.

  18. Commercial Fleet Demand for Alternative-Fuel Vehicles in California

    E-Print Network [OSTI]

    Golob, Thomas F; Torous, Jane; Bradley, Mark; Brownstone, David; Crane, Soheila Soltani; Bunch, David S

    1996-01-01

    Operating cost (cents/mile) NGV operating cost Number offuel type on California roads NGV penetration Dual fueldummy: (0=NGV only; 1 =can also run on gasoline) NGV dual

  19. Natural Gas as a Future Fuel for Heavy-Duty Vehicles

    SciTech Connect (OSTI)

    Wai-Lin Litzke; James Wegrzyn

    2001-05-14

    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.

  20. Emissions of Non-CO2 Greenhouse Gases From the Production and Use of Transportation Fuels and Electricity

    E-Print Network [OSTI]

    Delucchi, Mark

    1997-01-01

    model but non- optimized NGV vans from other manufacturers,VFV = variable-fuel vehicle; NGV = natural gas vehicle; I =

  1. An Empirical Study of Alternative Fuel Vehicle Choice by Commercial Fleets: Lessons in Transportation Choices, and Public Agencies' Organization

    E-Print Network [OSTI]

    Crane, Soheila Soltani

    1996-01-01

    and safety are the primary NGV concern. The resale value ischoice (choices are EV, NGV, methanol, and gasoline) based

  2. Testing Electric Vehicle Demand in "Hybrid Households" Using a Reflexive Survey

    E-Print Network [OSTI]

    Kurani, Kenneth S.; Turrentine, Thomas; Sperling, Daniel

    2001-01-01

    icVehicle (REV) s s (NGV) Reformulated Gasoline Vehicle (Among households that chose an NGV, chose to purchase the

  3. AMBER/VLTI high spectral resolution observations of the Br$\\gamma$ emitting region in HD 98922. A compact disc wind launched from the inner disc region

    E-Print Network [OSTI]

    Garatti, A Caratti o; Lopez, R Garcia; Kraus, S; Schertl, D; Grinin, V P; Weigelt, G; Hofmann, K -H; Massi, F; Lagarde, S; Vannier, M; Malbet, F

    2015-01-01

    We analyse the main physical parameters and the circumstellar environment of the young Herbig Be star HD 98922. We present AMBER/VLTI high spectral resolution (R =12000) interferometric observations across the Br$\\gamma$ line, accompanied by UVES high-resolution spectroscopy and SINFONI-AO assisted near-infrared integral field spectroscopic data. To interpret our observations, we develop a magneto-centrifugally driven disc-wind model. Our analysis of the UVES spectrum shows that HD 98922 is a young (~5x10^5 yr) Herbig Be star (SpT=B9V), located at a distance of 440(+60-50) pc, with a mass accretion rate of ~9+/-3x10^(-7) M_sun yr^(-1). SINFONI K-band AO-assisted imaging shows a spatially resolved circumstellar disc-like region (~140 AU in diameter) with asymmetric brightness distribution. Our AMBER/VLTI UT observations indicate that the Br$\\gamma$ emitting region (radius ~0.31+/-0.04 AU) is smaller than the continuum emitting region (inner dust radius ~0.7+/-0.2 AU), showing significant non-zero V-shaped diff...

  4. Chemical surface inhomogeneities in late B-type stars with Hg and Mn peculiarity I Spot evolution in HD 11753 on short and long time scales

    E-Print Network [OSTI]

    Korhonen, H; Briquet, M; Soriano, M Flores; Hubrig, S; Savanov, I; Hackman, T; Ilyin, I V; Eulaers, E; Pessemier, W

    2013-01-01

    Aims: Time series of high-resolution spectra of the late B-type star HD 11753 exhibiting HgMn chemical peculiarity are used to study the surface distribution of different chemical elements and their temporal evolution. Methods: High-resolution and high signal-to-noise ratio spectra were obtained using the CORALIE spectrograph at La Silla in 2000, 2009, and 2010. Surface maps of YII, SrII, TiII, and CrII were calculated using the Doppler imaging technique. The results were also compared to equivalent width measurements. The evolution of chemical spots both on short and long time scales were investigated. Results: We determine the binary orbit of HD 11753 and fine-tune the rotation period of the primary. The earlier discovered fast evolution of the chemical spots is confirmed by an analysis using both the chemical spot maps and equivalent width measurements. In addition, a long-term decrease in the overall YII and SrII abundances is discovered. A detailed analysis of the chemical spot configurations reveals som...

  5. POLARIZED LIGHT IMAGING OF THE HD 142527 TRANSITION DISK WITH THE GEMINI PLANET IMAGER: DUST AROUND THE CLOSE-IN COMPANION

    SciTech Connect (OSTI)

    Rodigas, Timothy J.; Weinberger, Alycia; Follette, Katherine B.; Close, Laird; Hines, Dean C.

    2014-08-20

    When giant planets form, they grow by accreting gas and dust. HD 142527 is a young star that offers a scaled-up view of this process. It has a broad, asymmetric ring of gas and dust beyond ?100 AU and a wide inner gap. Within the gap, a low-mass stellar companion orbits the primary star at just ?12 AU, and both the primary and secondary are accreting gas. In an attempt to directly detect the dusty counterpart to this accreted gas, we have observed HD 142527 with the Gemini Planet Imager in polarized light at Y band (0.95-1.14 ?m). We clearly detect the companion in total intensity and show that its position and photometry are generally consistent with the expected values. We also detect a point source in polarized light that may be spatially separated by ? a few AU from the location of the companion in total intensity. This suggests that dust is likely falling onto or orbiting the companion. Given the possible contribution of scattered light from this dust to previously reported photometry of the companion, the current mass limits should be viewed as upper limits only. If the dust near the companion is eventually confirmed to be spatially separated, this system would resemble a scaled-up version of the young planetary system inside the gap of the transition disk around LkCa 15.

  6. State-to-state dynamics of the H{sup *}(n) + HD ? D{sup *}(n{sup ?}) + H{sub 2} reactive scattering

    SciTech Connect (OSTI)

    Yu, Shengrui; Su, Shu; Dai, Dongxu; Yuan, Kaijun, E-mail: kjyuan@dicp.ac.cn, E-mail: xmyang@dicp.ac.cn; Yang, Xueming, E-mail: kjyuan@dicp.ac.cn, E-mail: xmyang@dicp.ac.cn [State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (China)] [State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023 (China)

    2014-01-21

    The state-to-state dynamics of the H{sup *}(n) + HD ? D{sup *}(n{sup ?}) + H{sub 2} reactive scattering at the collision energy of 0.5 eV have been carried out for the first time by using H-atom Rydberg tagging time-of-flight technique. Experimental results show that the angular distribution of the total H{sub 2} products presents clearly forward-backward asymmetric, which considerably differs from that of the corresponding H{sup +} + HD ? D{sup +} + H{sub 2} reaction predicted by previously theoretical calculations. Such disagreement between these two processes suggests that the Fermi independent-collider model is also not valid in describing the dynamics of isotopic variants of the H{sup *} + H{sub 2} reaction. The rotational state distribution of the H{sub 2} products demonstrates a saw-toothed distribution with odd-j{sup ?} > even-j{sup ?}. This interesting observation is strongly influenced by nuclear spin statistics.

  7. IMPROVED V I log(gf) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937

    SciTech Connect (OSTI)

    Lawler, J. E.; Wood, M. P.; Den Hartog, E. A.; Feigenson, T.; Sneden, C.; Cowan, J. J. E-mail: mpwood@wisc.edu E-mail: tfeigenson@wisc.edu E-mail: cowan@nhn.ou.edu

    2015-01-01

    New emission branching fraction measurements for 836 lines of the first spectrum of vanadium (V I) are determined from hollow cathode lamp spectra recorded with the National Solar Observatory 1 m Fourier transform spectrometer (FTS) and a high-resolution echelle spectrometer. The branching fractions are combined with recently published radiative lifetimes from laser-induced fluorescence measurements to determine accurate absolute atomic transition probabilities for the 836 lines. The FTS data are also used to extract new hyperfine structure A coefficients for 26 levels of neutral vanadium. These new laboratory data are applied to determine the V abundance in the Sun and metal-poor star HD 84937, yielding log ?(V) = 3.956 ± 0.004 (? = 0.037) based on 93 V I lines and log ?(V) = 1.89 ± 0.03 (? = 0.07) based on nine V I lines, respectively, using the Holweger-Müller 1D model. These new V I abundance values for the Sun and HD 84937 agree well with our earlier determinations based upon V II.

  8. Renewable Energy Economic Potential

    Broader source: Energy.gov [DOE]

    The report describes a geospatial analysis method to estimate the economic potential of several renewable resources available for electricity generation in the United States. Economic potential, one measure of renewable generation potential, is defined in this report as the subset of the available resource technical potential where the cost required to generate the electricity (which determines the minimum revenue requirements for development of the resource) is below the revenue available in terms of displaced energy and displaced capacity.

  9. Measurement of the HD,,v 2,J 3... product differential cross section for the H D2 exchange reaction at 1.55 0.05eV

    E-Print Network [OSTI]

    Measurement of the HD,,v 2,J 3... product differential cross section for the H D2 exchange reaction, and Gentry,55 and Con- tinetti, Balko, and Lee56 measured product differential cross sections, but owing nascent product laboratory velocity distributions from which differential cross sections may be deduced

  10. The $?-?$ fishbone potential revisited

    E-Print Network [OSTI]

    J. P. Day; J. E. McEwen; M. Elhanafy; E. Smith; R. Woodhouse; Z. Papp

    2011-05-30

    The fishbone potential of composite particles simulates the Pauli effect by nonlocal terms. We determine the $\\alpha-\\alpha$ fishbone potential by simultaneously fitting to two-$\\alpha$ resonance energies, experimental phase shifts and three-$\\alpha$ binding energies. We found that essentially a simple gaussian can provide a good description of two-$\\alpha$ and three-$\\alpha$ experimental data without invoking three-body potentials.

  11. Field matric potential sensor

    DOE Patents [OSTI]

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

    2001-01-01

    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.

  12. ANALYTICAL METHOD FOR MEASURING TOTAL PROTIUM AND TOTAL DEUTERIUM IN A GAS MIXTURE CONTAINING H2, D2,AND HD VIA GAS CHAROMATOGRAPHY

    SciTech Connect (OSTI)

    Sessions, H

    2007-08-07

    The most common analytical method of identifying and quantifying non-radioactive isotopic species of hydrogen is mass spectrometry. A low mass, high resolution mass spectrometer with adequate sensitivity and stability to identify and quantify hydrogen isotopes in the low ppm range is an expensive, complex instrument. A new analytical technique has been developed that measures both total protium (H) and total deuterium (D) in a gas mixture containing H{sub 2}, D{sub 2}, and HD using an inexpensive micro gas chromatograph (GC) with two molecular sieve columns. One column uses D{sub 2} as the carrier gas and the other uses H{sub 2} as the carrier gas. Laboratory tests have shown that when used in this configuration the GC can measure both total protium and total deuterium each with a detection and quantification limit of less than 20 ppm.

  13. SU-E-T-569: Evaluation of VMAT Plans Generated with HD120 and Millennium 120 MLC Between Two Matched Linacs

    SciTech Connect (OSTI)

    Cui, G; Ballas, L; Chang, E; Chung, E; Chiu, R; Cummings, D; Shiu, A

    2014-06-01

    Purpose: To evaluate VMAT treatment plans generated with HD120 MLC and Millennium 120 MLC between two matched linacs and to determine if one can back up the other. Methods: The 6x photon beams are matched for our Varian TrueBeam STx and Trilogy linacs, which are equipped with HD120 MLC and Millennium 120 MLC, respectively. Three prostate and three brain VMAT plans were used for the evaluation. Five plans (three prostate and two brain plans) were originally generated with the TrueBeam STx and re-computed with the Trilogy. One brain plan was evaluated the other way around. For each plan, the PTV coverage of V95 was made the same between two linacs. The dosimetric differences associated with the plans were compared using: 1) Percentage mean dose differences to the PTV, 2) Homogeneity index, HI = (Dmax ? Dmin)/Dmean for the PTV. For prostate plans, the mean dose differences to the rectum were evaluated. While for brain plans, the percentage max dose differences to the lenses (left and right lens) were evaluated. Results: For three prostate plans, the average of the percentage mean dose differences to the PTV was 0.5 ± 0.1% and the HI was 0.1 ± 0.0%. The average of the percentage mean dose difference to the rectum was 3.5 ± 0.5%. For three brain plans, the average of the percentage mean dose differences to the PTV was 0.2 ± 1.1% and the HI was 0.2 ± 0.1%. The average of the percentage max dose differences to the lenses was 22.9 ± 4.0%. Conclusion: For prostate VMAT plans, changing the treatment from the TrueBeam STx to the Trilogy does not necessarily need re-optimization. But for brain plans, in order to minimize dose to the lenses, it is recommended to re-optimize the plan if changing the treatment between these two linacs.

  14. VARIABILITY OF DISK EMISSION IN PRE-MAIN SEQUENCE AND RELATED STARS. III. EXPLORING STRUCTURAL CHANGES IN THE PRE-TRANSITIONAL DISK IN HD 169142

    SciTech Connect (OSTI)

    Wagner, Kevin R.; Sitko, Michael L.; Swearingen, Jeremy R.; Champney, Elizabeth H.; Johnson, Alexa N.; Werren, Chelsea; Grady, Carol A.; Whitney, Barbara A.; Russell, Ray W.; Schneider, Glenn H.; Momose, Munetake; Muto, Takayuki; Inoue, Akio K.; Lauroesch, James T.; Hornbeck, Jeremy; Brown, Alexander; Fukagawa, Misato; Currie, Thayne M.; Wisniewski, John P.; Woodgate, Bruce E. E-mail: sitkoml@ucmail.uc.edu E-mail: ehchampney@gmail.com E-mail: ccwerren@yahoo.com E-mail: bwhitney@astro.wisc.edu

    2015-01-10

    We present near-IR (NIR) and far-UV observations of the pre-transitional (gapped) disk in HD 169142 using NASA's Infrared Telescope Facility and Hubble Space Telescope. The combination of our data along with existing data sets into the broadband spectral energy distribution reveals variability of up to 45% between ?1.5-10 ?m over a maximum timescale of 10 yr. All observations known to us separate into two distinct states corresponding to a high near-IR state in the pre-2000 epoch and a low state in the post-2000 epoch, indicating activity within the ?1 AU region of the disk. Through analysis of the Pa ? and Br ? lines in our data we derive a mass accretion rate in 2013 May of M-dot ? (1.5-2.7) × 10{sup –9} M {sub ?} yr{sup –1}. We present a theoretical modeling analysis of the disk in HD 169142 using Monte-Carlo radiative transfer simulation software to explore the conditions and perhaps signs of planetary formation in our collection of 24 yr of observations. We find that shifting the outer edge (r ? 0.3 AU) of the inner disk by 0.05 AU toward the star (in simulation of accretion and/or sculpting by forming planets) successfully reproduces the shift in NIR flux. We establish that the ?40-70 AU dark ring imaged in the NIR by Quanz et al. and Momose et al. and at 7 mm by Osorio et al. may be reproduced with a 30% scaled density profile throughout the region, strengthening the link to this structure being dynamically cleared by one or more planetary mass bodies.

  15. Time-dependent wave-packet quantum scattering study of the reactions D{sup -}+H{sub 2}{yields}H{sup -}+HD and H{sup -}+D{sub 2}{yields}D{sup -}+HD

    SciTech Connect (OSTI)

    Yao Li [State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China); Department of Physics, Dalian Maritime University, Dalian 116026 (China); Ju Liping; Han Keli [State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China); Chu Tianshu [State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China); Institute for Computational Sciences and Engineering, Qingdao University, Qingdao 266071 (China)

    2006-12-15

    The cross sections of the title reactions were calculated as functions of collision energy in the range 0.2-2.4 eV on a potential energy surface of Panda and Sathyamurthy [J. Chem. Phys. 121, 9343 (2004)]. The calculated results with the Coriolis coupled method were found to be more consistent with the experimental ones than the centrifugal sudden approximation, thus suggesting that Coriolis coupling plays an important role in those reactions. A pronounced isotopic effect was also revealed and attributed to the significant difference of the effective potential barrier height in both reactions.

  16. Mapping Biomass Distribution Potential

    E-Print Network [OSTI]

    Schaetzel, Michael

    2010-11-18

    stream_size 1487 stream_content_type text/plain stream_name ku_gis_day_2010_schaetzel.pdf.txt stream_source_info ku_gis_day_2010_schaetzel.pdf.txt Content-Encoding UTF-8 Content-Type text/plain; charset=UTF-8 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 nation’s power o Currently 1% of...

  17. Ground potential rise monitor

    DOE Patents [OSTI]

    Allen, Zachery Warren; Zevenbergen, Gary Allen

    2012-07-17

    A device and method for detecting ground potential rise (GPR) comprising a first electrode, a second electrode, and a voltage attenuator. The first electrode and the second electrode are both electrically connected to the voltage attenuator. A means for determining the presence of a dangerous ground potential is connected to the voltage attenuator. The device and method further comprises a means for enabling one or more alarms upon the detection of the dangerous ground potential. Preferably, a first transmitter/receiver is connected to the means for enabling one or more alarms. Preferably, a second transmitter/receiver, comprising a button, is electromagnetically connected to the first transmitter/receiver. Preferably, the means for determining the presence of a dangerous ground potential comprises a means for determining the true RMS voltage at the output of the voltage attenuator, a transient detector connected to the output of the voltage attenuator, or a combination thereof.

  18. Logistic Map Potentials

    E-Print Network [OSTI]

    Thomas Curtright; Andrzej Veitia

    2010-05-27

    We develop and illustrate methods to compute all single particle potentials that underlie the logistic map, x --> sx(1-x) for 02. We illustrate the methods numerically for the cases s=5/2 and s=10/3.

  19. Development of NGV high pressure storage technologies. Brunswick Composites Project No. 19072. Final report, November 1992-December 1994

    SciTech Connect (OSTI)

    Tiller, D.; Schimenti, J.; Connolly, M.P.; Glaesemann, W.

    1994-12-01

    The objective of this project was to evaluate All-Composite cylinders relative to their damage toughness and to determine if acoustic emission (AE) testing might be a viable nondestructive evaluation (NDE) technique for evaluating performance. Damage testing included drop test, pendulum impact, and machined flaws. A total of nine cylinders were intentionally damaged, and the cycle and burst test performance of these cylinders was compared to the performance of nine undamaged cylinders. The test results revealed that, with one exception, the damage on these units did not significantly affect cycle life or burst pressure performance. A total of thirty-five cylinders were subjected to AE testing. This testing indicated that AE was not a useful technique for predicting cylinder stress-rupture life; however, AE did show promise as a means of detecting localized cylinder damage.

  20. LABORATORY III POTENTIAL ENERGY

    E-Print Network [OSTI]

    Minnesota, University of

    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

  1. PRECISE ESTIMATES OF THE PHYSICAL PARAMETERS FOR THE EXOPLANET SYSTEM HD 17156 ENABLED BY HUBBLE SPACE TELESCOPE FINE GUIDANCE SENSOR TRANSIT AND ASTEROSEISMIC OBSERVATIONS

    SciTech Connect (OSTI)

    Nutzman, Philip; Charbonneau, David; Holman, Matthew J. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Gilliland, Ronald L.; McCullough, Peter R.; Nelan, Edmund P. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Christensen-Dalsgaard, Joergen; Kjeldsen, Hans [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark); Brown, Timothy M., E-mail: pnutzman@cfa.harvard.edu [Las Cumbres Observatory Global Telescope, Goleta, CA 93117 (United States)

    2011-01-01

    We present observations of three distinct transits of HD 17156b obtained with the Fine Guidance Sensors on board the Hubble Space Telescope. We analyzed both the transit photometry and previously published radial velocities to find the planet-star radius ratio R{sub p} /R{sub *} = 0.07454 {+-} 0.00035, inclination i = 86.49{sup +0.24}{sub -0.20} deg, and scaled semimajor axis a/R{sub *} = 23.19{sup +0.32}{sub -0.27}. This last value translates directly to a mean stellar density determination {rho}{sub *} = 0.522{sup +0.021}{sub -0.018} g cm{sup -3}. Analysis of asteroseismology observations by the companion paper of Gilliland et al. provides a consistent but significantly refined measurement of {rho}{sub *} = 0.5308 {+-} 0.0040. We compare stellar isochrones to this density estimate and find M{sub *} = 1.275 {+-} 0.018 M{sub sun} and a stellar age of 3.37{sup +0.20}{sub -0.47} Gyr. Using this estimate of M{sub *} and incorporating the density constraint from asteroseismology, we model both the photometry and published radial velocities to estimate the planet radius R{sub p} = 1.0870 {+-} 0.0066 R{sub J} and the stellar radius R{sub *} = 1.5007 {+-} 0.0076 R{sub sun}. The planet radius is larger than that found in previous studies and consistent with theoretical models of a solar-composition gas giant of the same mass and equilibrium temperature. For the three transits, we determine the times of mid-transit to a precision of 6.2 s, 7.6 s, and 6.9 s, and the transit times for HD 17156 do not show any significant departures from a constant period. The joint analysis of transit photometry and asteroseismology presages similar studies that will be enabled by the NASA Kepler Mission.

  2. Detailed abundances of planet-hosting wide binaries. I. Did planet formation imprint chemical signatures in the atmospheres of HD 20782/81?

    SciTech Connect (OSTI)

    Mack III, Claude E.; Stassun, Keivan G.; Schuler, Simon C.; Norris, John

    2014-06-01

    Using high-resolution, high signal-to-noise echelle spectra obtained with Magellan/MIKE, we present a detailed chemical abundance analysis of both stars in the planet-hosting wide binary system HD 20782 + HD 20781. Both stars are G dwarfs, and presumably coeval, forming in the same molecular cloud. Therefore we expect that they should possess the same bulk metallicities. Furthermore, both stars also host giant planets on eccentric orbits with pericenters ?0.2 AU. Here, we investigate if planets with such orbits could lead to the host stars ingesting material, which in turn may leave similar chemical imprints in their atmospheric abundances. We derived abundances of 15 elements spanning a range of condensation temperature, T {sub C} ? 40-1660 K. The two stars are found to have a mean element-to-element abundance difference of 0.04 ± 0.07 dex, which is consistent with both stars having identical bulk metallicities. In addition, for both stars, the refractory elements (T {sub C} >900 K) exhibit a positive correlation between abundance (relative to solar) and T {sub C}, with similar slopes of ?1×10{sup –4} dex K{sup –1}. The measured positive correlations are not perfect; both stars exhibit a scatter of ?5×10{sup –5} dex K{sup –1} about the mean trend, and certain elements (Na, Al, Sc) are similarly deviant in both stars. These findings are discussed in the context of models for giant planet migration that predict the accretion of H-depleted rocky material by the host star. We show that a simple simulation of a solar-type star accreting material with Earth-like composition predicts a positive—but imperfect—correlation between refractory elemental abundances and T {sub C}. Our measured slopes are consistent with what is predicted for the ingestion of 10-20 Earths by each star in the system. In addition, the specific element-by-element scatter might be used to distinguish between planetary accretion and Galactic chemical evolution scenarios.

  3. Scalar potential model progress

    E-Print Network [OSTI]

    J. C. Hodge

    2007-04-04

    Because observations of galaxies and clusters have been found inconsistent with General Relativity (GR), the focus of effort in developing a Scalar Potential Model (SPM) has been on the examination of galaxies and clusters. The SPM has been found to be consistent with cluster cellular structure, the flow of IGM from spiral galaxies to elliptical galaxies, intergalactic redshift without an expanding universe, discrete redshift, rotation curve (RC) data without dark matter, asymmetric RCs, galaxy central mass, galaxy central velocity dispersion, and the Pioneer Anomaly. In addition, the SPM suggests a model of past expansion, past contraction, and current expansion of the universe. GR corresponds to the SPM in the limit in which the effect of the Sources and Sinks approximate a flat scalar potential field such as between clusters and on the solar system scale, which is small relative to the distance to a Source.

  4. Cyclic Shape Invariant Potentials

    E-Print Network [OSTI]

    U. P. Sukhatme; C. Rasinariu; A. Khare

    1997-06-08

    We formulate and study the set of coupled nonlinear differential equations which define a series of shape invariant potentials which repeats after a cycle of $p$ iterations. These cyclic shape invariant potentials enlarge the limited reservoir of known analytically solvable quantum mechanical eigenvalue problems. At large values of $x$, cyclic superpotentials are found to have a linear harmonic oscillator behavior with superposed oscillations consisting of several systematically varying frequencies. At the origin, cyclic superpotentials vanish when the period $p$ is odd, but diverge for $p$ even. The eigenvalue spectrum consists of $p$ infinite sets of equally spaced energy levels, shifted with respect to each other by arbitrary energies $\\omega_0,\\omega_1,\\...,\\omega_{p-1}$. As a special application, the energy spacings $\\omega_k$ can be identified with the periodic points generatedby the logistic map $z_{k+1}=r z_k (1 - z_k)$. Increasing the value of $r$ and following the bifurcation route to chaos corresponds to studying cyclic shape invariant potentials as the period $p$ takes values 1,2,4,8,...

  5. Re-visit of HST FUV observations of hot-Jupiter system HD 209458: No Si III detection and the need for COS transit observations

    E-Print Network [OSTI]

    Ballester, G E

    2015-01-01

    The discovery of OI atoms and CII ions in the upper atmosphere of HD 209458b, made with the Hubble Space Telescope Imaging Spectrograph (STIS) using the G140L grating, showed that these heavy species fill an area comparable to the planet's Roche lobe. The derived ~10% transit absorption depths require super-thermal processes and/or supersolar abundances. From subsequent Cosmic Origins Spectrograph (COS) observations, CII absorption was reported with tentative velocity signatures, and absorption by SiIII ions was also claimed in disagreement with a negative STIS G140L detection. Here, we revisit the COS dataset showing a severe limitation in the published results from having contrasted the in-transit spectrum against a stellar spectrum averaged from separate observations, at planetary phases 0.27, 0.72, and 0.49. We find variable stellar SiIII and CII emissions that were significantly depressed not only during transit but also at phase 0.27 compared to phases 0.72 and 0.49. Their respective off-transit 7.5 and...

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

    E-Print Network [OSTI]

    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; Gutiérrez-Soto, J; Valtier, J C; Benko, J M; Bognár, Z; Niemczura, E; Amado, P J; Suárez, J C; Moya, A; Rodriguez-Lopez, C; Garrido, R

    2009-01-01

    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...

  7. 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

  8. 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submitKansasCommunities EnergyU.S. DOE Office of99 Diagram4th, 2014Resource Potential

  9. Proceedings of ASME Turbo Expo 2012 June 11-15, 2012, Copenhagen, Denmark

    E-Print Network [OSTI]

    Camci, Cengiz

    and a 29 bladed HP turbine rotor. The NGV inlet and exit Reynolds numbers based on midspan axial chord. The computational predictions are compared to experimental data at NGV exit plane and rotor in- let plane. NGV exit with the experimental total pressure coefficient data at the NGV exit. The difference between the NGV only simulation

  10. Ground potential rise monitor

    DOE Patents [OSTI]

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

    2012-04-03

    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.

  11. Colorado Potential Geothermal Pathways

    SciTech Connect (OSTI)

    Zehner, Richard E.

    2012-02-01

    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) WGS’1984 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

  12. Biomass Energy Crops: Massachusetts' Potential

    E-Print Network [OSTI]

    Schweik, Charles M.

    plant fuel. We examine potential biomass energy demand in the 5-county area, and then review cropBiomass Energy Crops: Massachusetts' Potential Prepared for: Massachusetts Division of Energy is thought to have significantly more potential than forest biomass energy (Perlack, Wright et al. 2005). One

  13. Potential Impacts of CLIMATE CHANGE

    E-Print Network [OSTI]

    Sheridan, Jennifer

    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

  14. RANGELAND SEQUESTRATION POTENTIAL ASSESSMENT

    SciTech Connect (OSTI)

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

    2012-03-31

    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.

  15. Harmonic potential and hadron spectroscopy

    E-Print Network [OSTI]

    Rafael Tumanyan

    2009-05-28

    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.

  16. The Household Market for Electric Vehicles: Testing the Hybrid Household Hypothesis--A Reflively Designed Survey of New-car-buying, Multi-vehicle California Households

    E-Print Network [OSTI]

    Turrentine, Thomas; Kurani, Kenneth

    1995-01-01

    HEV) - Natural Gas Vehicle (NGV) 140 or 180 80 or 120EV, and 20 percent chose an NGV. All EVs, including hybridHouseholds that wanted an NGV had a choice of two range

  17. An empirical analysis on the adoption of alternative fuel vehicles:The case of natural gas vehicles

    E-Print Network [OSTI]

    Yeh, Sonia

    2007-01-01

    Latest International NGV Statistics /http://www.iangv. org/view/17/35/S. IANGV, 2006b. NGV Country Report /http://S. IANGV, 2006c. NGV Country Report: Brazil /http://

  18. Estimating Policy-Driven Greenhouse Gas Emissions Trajectories in California: The California Greenhouse Gas Inventory Spreadsheet (GHGIS) Model

    E-Print Network [OSTI]

    Greenblatt, Jeffery B.

    2014-01-01

    NAS mpg, +ZEVs, automation NGV, more efficiency, automationSciences; NG = natural gas; NGV = natural gas vehicle; OTC =and ignored, as EV and NGV demand forecasts were provided by

  19. 1 potential, 2 potentials, 3 potentials4: Untangling the UV photodissociation spectra of HI and DI

    E-Print Network [OSTI]

    Le Roy, Robert J.

    1 potential, 2 potentials, 3 potentials­4: Untangling the UV photodissociation spectra of HI and DI coefficient and branching-ratio data for the UV photodissociation spectra of HI and DI has been used.1063/1.1513303 I. INTRODUCTION The UV photochemical decomposition of HI has been studied for more than a century,1

  20. Chapter 20: Electric Potential and Electric Potential Energy

    E-Print Network [OSTI]

    Kioussis, Nicholas

    1 Chapter 20: Electric Potential and Electric Potential Energy 2. A 4.5 µC 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

  1. Commercial Building Toplighting: Energy Saving Potential and Potential Paths Forward

    SciTech Connect (OSTI)

    Lawrence, Tyson; Roth, Kurt W.

    2008-06-01

    This report documents the energy-saving potential of toplighting, a form of daylighting that combines skylights and electric lighting controls.

  2. Independent Sets in Regular Hypergraphs and Multi-Dimensional Runlength-Limited Constraints

    E-Print Network [OSTI]

    Roth, Ronny

    in VG let NG(v) denote the set of vertices that are adjacent to v in G, namely, NG(v) = n v0 2 VG nfvg

  3. Quantification of the Potential Energy

    E-Print Network [OSTI]

    Columbia University

    Quantification of the Potential Energy from Residuals (EfR) in the UK Commissioned, by virtue of its biomass content, it can make a valuable contribution towards our renewable energy targets1 waste up to 2020. To determine the potential2 contribution that energy recovery from residual

  4. Scalar field potentials for cosmology

    E-Print Network [OSTI]

    Victor H. Cardenas; Sergio del Campo

    2004-01-05

    We discuss different aspects of modern cosmology through a scalar field potential construction method. We discuss the case of negative potential cosmologies and its relation with oscillatory cosmic evolution, models with a explicit interaction between dark energy and dark matter which address the coincidence problem and also the case of non-zero curvature space.

  5. Completeness for sparse potential scattering

    SciTech Connect (OSTI)

    Shen, Zhongwei

    2014-01-15

    The present paper is devoted to the scattering theory of a class of continuum Schrödinger 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 Schrödinger operators with sparse potentials, this paper gives the first proof of the completeness of wave operators.

  6. Hertz Potentials and Differential Geometry 

    E-Print Network [OSTI]

    Bouas, Jeffrey David

    2011-08-08

    , and I present techniques for introducing gauge terms of arbitrary order. Finally, I give a treatment of one application of Hertz potentials, namely calculating electromagnetic Casimir interactions for a couple of systems....

  7. Groundwater Contamination Potential from Stormwater

    E-Print Network [OSTI]

    Clark, Shirley E.

    1 Groundwater Contamination Potential from Stormwater Infiltration Robert Pitt, University (CSOs). Introduction (cont.) · Scattered information is available addressing groundwater impacts cities · EPA 1983 NURP work on groundwater beneath Fresno and Long Island infiltration basins · NRC 1994

  8. Zombie Apocalypse and GIS Potential

    E-Print Network [OSTI]

    Siegel, Daniel

    2013-01-15

    Zombie Apocalypse and GIS Potential Daniel Siegel Senior in Environmental Studies Minor in GIS KU GIS Day 2012 Playing Movie Director Point of infection (POI): Haworth Hall Zombies • Attracted to population centers • Move Easily... Zombie Apocalypse and GIS Potential Daniel Siegel Senior in Environmental Studies Minor in GIS KU GIS Day 2012 Playing Movie Director Point of infection (POI): Haworth Hall Zombies • Attracted to population centers • Move Easily...

  9. Dirac Equations with Confining Potentials

    E-Print Network [OSTI]

    J. H. Noble; U. D. Jentschura

    2015-02-06

    This paper is devoted to a study of relativistic eigenstates of Dirac particles which are simultaneously bound by a static Coulomb potential and added linear confining potentials. It has recently been shown that, despite the addition of radially symmetric, linear confining potentials, some specific bound-state energies surprisingly retain their exact Dirac--Coulomb values (in the sense of an "exact symmetry"). This observation raises pertinent questions as to the generality of the cancellation mechanism. A Foldy-Wouthuysen transformation is used to find the relevant nonrelativistic physical degrees of freedom, which include additional spin-orbit couplings induced by the linear confining potentials. The matrix elements of the effective operators obtained from the scalar, and time-like confining potentials mutually cancel for specific ratios of the prefactors of the effective operators, which must be tailored to the cancellation mechanism. The result of the Foldy-Wouthuysen transformation is used to explicitly show that the cancellation is accidental and restricted (for a given Hamiltonian) to only one reference state, rather than traceable to a more general relationship among the obtained effective low-energy operators. Furthermore, we show that the cancellation mechanism does not affect anti-particle (negative-energy) states.

  10. Generalized Stillinger--David Potential

    E-Print Network [OSTI]

    Igor Zhyganiuk

    2012-02-20

    We present an improved version of the Stillinger--David polarization potential of the intermolecular interaction in water. A clear algorithm of construction of a function describing the oxygen-hydrogen interaction in water molecules is formulated. A new approach to the modeling of a function screening the charge-dipole interaction on small distances is developed. To describe the long-range asymptotics of the intermolecular potential, the bare Stillinger--David potential is supplemented by a term related to the interaction of dipole moments of oxygen ions. In addition, we introduce a term involving a deformation of the electron shells of oxygen ions to the polarization component. These corrections allow us to successfully reproduce all essential results of quantum mechanical calculations of the interaction energy for water molecules obtained by Clementi. Analyzing the behavior of the dipole moment of a water molecule as a function of the intermolecular distance, we obtain the estimate of irreducible two-particle effects in water.

  11. Kähler potentials for Planck inflation

    SciTech Connect (OSTI)

    Roest, Diederik; Scalisi, Marco; Zavala, Ivonne E-mail: m.scalisi@rug.nl

    2013-11-01

    We assess which Kähler potentials in supergravity lead to viable single-field inflationary models that are consistent with Planck. We highlight the role of symmetries, such as shift, Heisenberg and supersymmetry, in these constructions. Also the connections to string theory are pointed out. Finally, we discuss a supergravity model for arbitrary inflationary potentials that is suitable for open string inflation and generalise it to the case of closed string inflation. Our model includes the recently discussed supergravity reformulation of the Starobinsky model of inflation as well as an interesting alternative with comparable predictions.

  12. Exotic static 3-body potentials

    E-Print Network [OSTI]

    P. Bicudo; M. Cardoso; O. Oliveira

    2008-11-06

    We study exotic static 3-body potentials, utilizing generalized Wilson Loops in SU(3) lattice QCD. For the quark-antiquark-gluon techniques we address the angles of 0, 45, 60, 90, 120, 135 and 180 degrees, between the quark-gluon and the antiquark-gluon segments. We calculate the form of the static potential and discuss whether, or not, two-body interactions exist between the three different bodies, and study the existence of repulsion between the strings. We also perform a first study of the interactions in the system of three gluon.

  13. Technical Potential for Solar Photovoltaics

    E-Print Network [OSTI]

    Branoff, Theodore J.

    Technical Potential for Solar Photovoltaics in Illinois May 2013 #12;Authors ...................................................................................................... 1.1 Utility-Scale Solar Photovoltaic Systems in the U.S. ........................... 1.2 Previous ...................................................................................................... 3.1 Optimization Matrix for Large-Scale PV System Applications ......... 3.2 Photovoltaic

  14. POTENTIAL OF CLOUD-BASED

    E-Print Network [OSTI]

    Lee, Jason R.

    .!! Cover!photos!courtesy!of!the!National!Energy!Research!Scientific!Computing!Center!and!Google.! #12;! ! ! The Energy Efficiency Potential of Cloud-Based Software: A U.S. Case Study ! Lawrence Berkeley National Laboratory June, 2013 Research Team Eric!Masanet! Arman!Shehabi! Jiaqi!Liang! Lavanya!Ramakrishnan! Xiao

  15. Three-loop static potential

    E-Print Network [OSTI]

    Alexander V. Smirnov; Vladimir A. Smirnov; Matthias Steinhauser

    2010-04-12

    We compute the three-loop corrections to the potential of two heavy quarks. In particular we consider in this Letter the purely gluonic contribution which provides in combination with the fermion corrections of Ref. \\cite{Smirnov:2008pn} the complete answer at three loops.

  16. Quantum mechanics without potential function

    E-Print Network [OSTI]

    A. D. Alhaidari; M. E. H. Ismail

    2015-06-26

    In the standard formulation of quantum mechanics, one starts by proposing a potential function that models the physical system. The potential is then inserted into the Schr\\"odinger equation, which is solved for the wave function, bound states energy spectrum and/or scattering phase shift. In this work, however, we propose an alternative formulation in which the potential function does not appear. The aim is to obtain a set of analytically realizable systems, which is larger than in the standard formulation and may or may not be associated with any given or previously known potential functions. We start with the wavefunction, which is written as a bounded infinite sum of elements of a complete basis with polynomial coefficients that are orthogonal on an appropriate domain in the energy space. Using the asymptotic properties of these polynomials, we obtain the scattering phase shift, bound states and resonances. This formulation enables one to handle not only the well-known quantum systems but also previously untreated ones. Illustrative examples are given for two- and there-parameter systems.

  17. A knowledge of the potential

    E-Print Network [OSTI]

    Sali, Andrej

    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

  18. Canonical quantum potential scattering theory

    E-Print Network [OSTI]

    M. S. Hussein; W. Li; S. Wuester

    2008-07-13

    A new formulation of potential scattering in quantum mechanics is developed using a close structural analogy between partial waves and the classical dynamics of many non-interacting fields. Using a canonical formalism we find non-linear first-order differential equations for the low energy scattering parameters like scattering length and effective range. They significantly simplify typical calculations, as we illustrate for atom-atom and neutron-nucleus scattering systems. A generalization to charged particle scattering is also possible.

  19. Nanobiocatalysis and Its Potential Applications

    SciTech Connect (OSTI)

    Kim, Jungbae; Grate, Jay W.; Wang, Ping

    2008-11-01

    Nanobiocatalysis with enzymes incorporated into nanostructured materials have emerged as a rapidly growing area. Structures including nanoporous media, nanofibers, carbon nanotubes, and nanoparticles have been found to be efficient in manipulating the nanoscale environment of the enzyme and thus promising exciting advances in many areas of enzyme technology. This review will describe these recent developments in nanobiocatalysis and their potential applications in various fields such as trypsin digestion in proteomic analysis, antifouling, biofuel cells, and biosensors.

  20. PROOF COPY 004104JTM Christopher McLean1

    E-Print Network [OSTI]

    Camci, Cengiz

    aerodynamic effects associated with rotor­nozzle guide vane (NGV) gap coolant injections were investigated

  1. NONAXISYMMETRIC ENDWALL CONTOURING AND LEADING EDGE MODIFICATIONS ON TURBINE NOZZLE GUIDE VANES

    E-Print Network [OSTI]

    Guiltinan, Mark

    of the nozzle guide vane (NGV) and the hub endwall. It forms a smooth transition from the NGV leading edge facilities with no rotor influence or isolated annular NGV cascades. The procedure was to evaluate the new having a diameter of 91.66 cm. It has a stationary NGV assembly with 23 vanes and a High Pressure (HP

  2. Periodically Loaded Transmission Line with Effective Negative Refractive Index and Negative

    E-Print Network [OSTI]

    Mojahedi, Mohammad

    negative group velocity (NGV) in addition to the NRI. To achieve the NGV, a resonant circuit is embedded dispersion in which the group delay, and thus the group velocity, is negative [6]. The NGV simply means in magnitude. It must be added that NGV is not a violation of relativistic causality since the front

  3. Science Arts & Mtiers (SAM) is an open access repository that collects the work of Arts et Mtiers ParisTech

    E-Print Network [OSTI]

    Boyer, Edmond

    is the high pressure turbine nozzle guide vane (NGV) downstream of the combustion chamber. Designing high

  4. Phylogenetic Distribution of Potential Cellulases in Bacteria

    E-Print Network [OSTI]

    Berlemont, R.; Martiny, A. C

    2012-01-01

    Phylogenetic Distribution of Potential Cellulases incontent/79/5/1545 Phylogenetic Distribution of Potential3, 4). Thus, the phylogenetic distribution of en- zyme genes

  5. Clot Busting Simulations Test Potential Stroke Treatment

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

    Clot Busting Simulations Test Potential Stroke Treatment Clot Busting Simulations Test Potential Stroke Treatment September 24, 2013 | Tags: Biological and Environmental Research...

  6. Handling and Packaging a Potentially Radiologically Contaminated...

    Office of Environmental Management (EM)

    Handling and Packaging a Potentially Radiologically Contaminated Patient Handling and Packaging a Potentially Radiologically Contaminated Patient The purpose of this procedure is...

  7. Innovative DOE Technology Demonstrates Potential for Significant...

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

    DOE Technology Demonstrates Potential for Significant Increases in Safe and Responsible Production from Depleted U.S. Oil Fields Innovative DOE Technology Demonstrates Potential...

  8. Webinar: Potential Strategies for Integrating Solar Hydrogen...

    Office of Environmental Management (EM)

    Potential Strategies for Integrating Solar Hydrogen Production and Concentrating Solar Power: A Systems Analysis Webinar: Potential Strategies for Integrating Solar Hydrogen...

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

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

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

  10. Cassava, a potential biofuel crop in China

    E-Print Network [OSTI]

    Jansson, C.

    2010-01-01

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

  11. Dirac solutions for quaternionic potentials

    SciTech Connect (OSTI)

    De Leo, Stefano Giardino, Sergio

    2014-02-15

    The Dirac equation is solved for quaternionic potentials, i?V{sub 0} + j?W{sub 0} (V{sub 0}?R , W{sub 0}?C). The study shows two different solutions. The first one contains particle and anti-particle solutions and leads to the diffusion, tunneling, and Klein energy zones. The standard solution is recovered taking the complex limit of this solution. The second solution, which does not have a complex counterpart, can be seen as a V{sub 0}-antiparticle or |W{sub 0}|-particle solution.

  12. Effective potentials for Folding Proteins

    E-Print Network [OSTI]

    Nan-yow Chen; Zheng-Yao Su; Chung-Yu Mou

    2006-01-28

    A coarse-grained off-lattice model that is not biased in any way to the native state is proposed to fold proteins. To predict the native structure in a reasonable time, the model has included the essential effects of water in an effective potential. Two new ingredients, the dipole-dipole interaction and the local hydrophobic interaction, are introduced and are shown to be as crucial as the hydrogen bonding. The model allows successful folding of the wild-type sequence of protein G and may have provided important hints to the study of protein folding.

  13. The circumstellar shell of the post-AGB star HD 56126: the 12C12C/12C13C isotope ratio and 12C16O column density

    E-Print Network [OSTI]

    Eric J. Bakker; David L. Lambert

    1998-04-22

    We have made the first detection of circumstellar absorption lines of the 12C13C (Phillips) system 1-0 band and the 12C16O first-overtone 2-0 band in the spectrum of the post-AGB star HD56126 (IRAS07134+1005). The rotational temperatures are lower for molecules with a higher permanent dipole moment. Derived relative column densities ratios are 12C12C/12C13C=36+-13, 12C16O/(12C12C+12C13C)=606+-230, and 12C16O/(12C14N+13C14N)=475+-175. The isotopic exchange reaction for 12C12C is too slow to significantly alter the 12C12C/12C13C ratio and the 12C12C to 12C13C ratio a good measure of half the carbon isotope ratio: 12C/13C=2 X 12C12C/12C13C=72+-26. A fit of the 12C12C excitation model of van Dishoeck & Black (1982) to the relative population distribution of 12C12C yields n sigma / I = 3.3 +- 1.0 X 1e-14. At r=1e16cm this translates in n=1.7e7cm-3 and dM/dt=2.5e-4Msol/year.

  14. The potential of renewable energy

    SciTech Connect (OSTI)

    Not Available

    1990-03-01

    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.

  15. Drawing driver's attention to potentially dangerous objects

    E-Print Network [OSTI]

    Kurugöl, Orc?un

    2008-01-01

    Drivers often have difficulties noticing potentially dangerous objects due to weather or lighting conditions or when their field of view is restricted. This thesis presents a display method for potentially dangerous objects ...

  16. Potential Energy and the Body Electric

    E-Print Network [OSTI]

    Helmreich, Stefan

    Physics tells us that potential energy is the capacity to do work that a body possesses as a result of its position in electric, magnetic, or gravitational fields. Thinking of “potentiality” in an electric idiom and with ...

  17. ASSESSMENT OF HOUSEHOLD CARBON FOOTPRINT REDUCTION POTENTIALS

    E-Print Network [OSTI]

    Masanet, Eric

    2010-01-01

    Energy Efficient Technology Potentials. 31 Conclusions and Recommendations 42 References. 45 Glossary . 50 Appendix 51 ii List

  18. Potential of Diazorphic, Endophytic Bacteria Associated with...

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

    of Diazorphic, Endophytic Bacteria Associated with Sugarcane for Energycane Production Potential of Diazorphic, Endophytic Bacteria Associated with Sugarcane for Energycane...

  19. Potential for Biofuels from Algae (Presentation)

    SciTech Connect (OSTI)

    Pienkos, P. T.

    2007-11-15

    Presentation on the potential for biofuels from algae presented at the 2007 Algae Biomass Summit in San Francisco, CA.

  20. Partners and Stakeholders: Roles and Potential Impact

    Broader source: Energy.gov [DOE]

    Partners and Stakeholders: Roles and Potential Impact, Chapter 6 from the Clean Energy Finance Guide, Third Edition

  1. Potential Energy Surfaces Donald G. Truhlar

    E-Print Network [OSTI]

    Truhlar, Donald G

    . 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

  2. LABORATORY II ELECTRIC FIELDS AND ELECTRIC POTENTIALS

    E-Print Network [OSTI]

    Minnesota, University of

    Lab II - 1 LABORATORY II ELECTRIC FIELDS AND ELECTRIC POTENTIALS In this lab you will continue the concepts of field and potential are abstract and difficult to visualize, this laboratory uses a computer and electric potential at any point in space. OBJECTIVES After successfully completing this laboratory, you

  3. Reduced MHD in Nearly Potential Magnetic Fields

    E-Print Network [OSTI]

    Strauss, Hank

    Reduced MHD in Nearly Potential Magnetic Fields H.R. Strauss Courant Institute of Mathematical that the magnetic field is close to a potential field. The potential field can have an arbitrary three dimensional. It is also the case in solar and stellar coronal magnetic fields, and in regions of the geomagnetic field

  4. Kazakhstan's potential provides Western opportunities

    SciTech Connect (OSTI)

    Darnell, R. )

    1993-01-01

    While crude oil production continues to drop in the Russian Federation at a rate of 15% to 20% per year, Kazakhstan's output rose from 440,000 bopd in 1991 to 446,000 bopd, as of November 1992. Much of this increase was exported to the Russian Federation to supplement the latter's declining production. while Kazakhstan received needed Russian goods in exchange for this oil, it isn't getting the hard currency that will be required to upgrade its petroleum industry. This is a serious problem for Kazakh officials, since they are counting on revenues from petroleum exports to invigorate their overall plan for economic growth in this newly independent country. In order to convert Kazakhstan's hydrocarbon potential into economic reality, two critical issues must be addressed immediately. First, Kazakhstan must develop a tax and minerals law that gives multinational petroleum companies an incentive to invest in opening a dedicated crude oil export route through Russia, and at least one alternate export route to the Caspian Sea or Persian Gulf. At present, even the most successful petroleum venture inside Kazakhstan would have to weave its way through the Russian bureaucracy to utilize that existing and inadequate export pipeline system. This quandary, of course, has recently become the undoing of several Western petroleum operations that have managed to actually produce exportable oil inside the Russian Federation itself, but they can't get it out. In addition, three other variables should be considered by any party that is evaluating Kazakhstan as a future area (see map for current fields) of interest for petroleum operations. These are political stability, field operating conditions, and the country's natural gas crisis. Each of these factors, though not as critical as the legal regime and export access, can radically affect how an operator might approach negotiating the terms of its particular project.

  5. Static potentials for quarkonia at finite temperatures

    E-Print Network [OSTI]

    Owe Philipsen

    2008-10-26

    We review non-perturbative static potentials commonly used in potential models for quarkonia at finite T. Potentials derived from Polyakov loop correlators are shown to be inappropriate for this purpose. The q\\bar{q} free energy is physical but has the wrong spatial decay and perturbative limit. The so-called singlet free energy is gauge dependent and unphysical. An appropriate static real time potential can be defined through a generalisation of pNRQCD to finite T. In perturbation theory, its real part reproduces the Debye-screened potential, its imaginary part accounts for Landau damping. Possibilities for its non-perturbative evaluation are discussed.

  6. Short distance physics with heavy quark potentials

    E-Print Network [OSTI]

    Zantow, F; Karsch, Frithjof; Petreczky, P

    2002-01-01

    We present lattice studies of heavy quark potentials in the quenched approximation of QCD at finite temperatures. Both, the color singlet and color averaged potentials are calculated. While the potentials are well known at large distances, we give a detailed analysis of their short distance behavior (from 0.015 fm to 1 fm) near the critical temperature. At these distances we expect that the T-dependent potentials go over into the zero temperature potential. Indeed, we find evidences that the temperature influence gets suppressed and the potentials starts to become a unique function of the underlying distance scale. We use this feature to normalize the heavy quark potentials at short distances and extract the free energy of the quark system in a gluonic heat bath.

  7. Green roofs: potential at LANL

    SciTech Connect (OSTI)

    Pacheco, Elena M [Los Alamos National Laboratory

    2009-01-01

    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.

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

    E-Print Network [OSTI]

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

    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

  9. Bohm's Quantum Potential as an Internal Energy

    E-Print Network [OSTI]

    Glen Dennis; Maurice de Gosson; Basil Hiley

    2014-12-15

    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.

  10. Pumped Storage and Potential Hydropower from Conduits

    SciTech Connect (OSTI)

    none,

    2015-02-25

    Th is Congressional Report, Pumped Storage Hydropower and Potential Hydropower from Conduits, addresses the technical flexibility that existing pumped storage facilities can provide to support intermittent renewable energy generation. This study considered potential upgrades or retrofit of these facilities, the technical potential of existing and new pumped storage facilities to provide grid reliability benefits, and the range of conduit hydropower opportunities available in the United States.

  11. Working Fluids Low Global Warming Potential Refrigerants

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

    by 50% compared to today's best common practice - Alternative refrigerants with low global warming potential (GWP) are needed to achieve these goals - Provide guidance to the...

  12. Urban Surfaces and Heat Island Mitigation Potentials

    E-Print Network [OSTI]

    Akbari, Hashem

    2008-01-01

    Finster. 2000. “The Urban Heat Island, Photochemical Smog,2001. “EPA/NASA Urban Heat Island Pilot Project,” GlobalSystem Urban Surfaces and Heat Island Mitigation Potentials

  13. Energy dependence of nucleon-nucleon potentials

    E-Print Network [OSTI]

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

    2008-12-03

    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.

  14. Hydrogen Infrastructure Market Readiness: Opportunities and Potential...

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

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

  15. The Snell law for quaternionic potentials

    SciTech Connect (OSTI)

    De Leo, Stefano; Ducati, Gisele C.

    2013-12-15

    By using the analogy between optics and quantum mechanics, we obtain the Snell law for the planar motion of quantum particles in the presence of quaternionic potentials.

  16. Estimating Mitigation Potential of Agricultural Projects: an...

    Open Energy Info (EERE)

    Tool (EX-ACT) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Brazil-Estimating Mitigation Potential of Agricultural Projects: an Application of the...

  17. Self-potential observations during hydraulic fracturing

    E-Print Network [OSTI]

    Moore, Jeffrey R.; Glaser, Steven D.

    2008-01-01

    6.1.4. Co-Seismic Electrokinetics The process of materialand creates a co-seismic self-potential, a process often

  18. Self-potential observations during hydraulic fracturing

    E-Print Network [OSTI]

    Moore, J R; Glaser, Steven D

    2007-01-01

    6.1.4. Co-Seismic Electrokinetics The process of materialand creates a co-seismic self-potential, a process often

  19. Self-potential observations during hydraulic fracturing

    E-Print Network [OSTI]

    Moore, J R; Glaser, Steven D

    2007-01-01

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

  20. Self-potential observations during hydraulic fracturing

    E-Print Network [OSTI]

    Moore, Jeffrey R.; Glaser, Steven D.

    2008-01-01

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

  1. Alternative Ways of Financing Infrastructure Investment: Potential...

    Open Energy Info (EERE)

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

  2. Guide for Conducting Energy Efficiency Potential Studies

    SciTech Connect (OSTI)

    none,

    2007-11-01

    Provides guidance on determining the efficiency potential in a utility footprint, state, or region; evaluating efficiency as a supply-side resource; and developing detailed efficiency program plans.

  3. Potential Water and Energy Savings from Showerheads

    E-Print Network [OSTI]

    Biermayer, Peter J.

    2005-01-01

    This report quantifies water and energy savings of the sixATIONAL L ABORATORY Potential Water and Energy Savings from4 Baseline Water and Energy Consumption …………………………….5

  4. Potential Thermoelectric Applications in Diesel Vehicles | Department...

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

    Thermoelectric Applications in Diesel Vehicles Potential Thermoelectric Applications in Diesel Vehicles 2003 DEER Conference Presentation: BSST, LLC 2003deercrane.pdf More...

  5. NREL Research Identifies Increased Potential for Perovskites...

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

    Research Identifies Increased Potential for Perovskites as a Material for Solar Cells October 30, 2015 Scientists at the Energy Department's National Renewable Energy Laboratory...

  6. STATEWIDE ENERGY EFFICIENCY POTENTIAL ESTIMATES AND TARGETS

    E-Print Network [OSTI]

    rates of forecasted natural gas consumption, electricity consumption and peak electricity demand Kae C. Lewis Project Manager Sylvia Bender Deputy Director ELECTRICITY SUPPLY ANALYSIS DIVISION B. B potential for electric consumption savings, 85 percent of the economic potential for peak demand savings

  7. Physics 321 Energy Conservation Potential Energy in

    E-Print Network [OSTI]

    Hart, Gus

    Physics 321 Hour 7 Energy Conservation ­ Potential Energy in One Dimension Bottom Line · Energy is conserved. · Kinetic energy is a definite concept. · If we can determine the kinetic energy at all points in space by knowing it at one point in space, we can invent a potential energy so that energy can

  8. Wave equations with energy dependent potentials

    E-Print Network [OSTI]

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

    2003-09-22

    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.

  9. Renewable Energy Potential for Brownfield Redevelopment Strategies

    E-Print Network [OSTI]

    Renewable Energy Potential for Brownfield Redevelopment Strategies Renewable energy resources are available throughout the United States.The National Renewable Energy Laboratory (NREL) performs analysis to identify high-potential sites for renewable energy technologies and can help determine those technologies

  10. Measuring Transport Protocol Potential for Energy Efficiency

    E-Print Network [OSTI]

    Tsaoussidis, Vassilis

    Measuring Transport Protocol Potential for Energy Efficiency S. Kontogiannis, L. Mamatas, I. Psaras. Several attempts have been made to measure the energy efficiency of trans- port protocols, (e.g. [10], [12-saving potential of transport pro- tocols. We focus on the system-related aspect of energy. Do we have to damage

  11. Neutrino matter potentials induced by Earth

    E-Print Network [OSTI]

    J. Linder

    2006-01-15

    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.

  12. Reassessing Wind Potential Estimates for India: Economic and Policy Implications

    E-Print Network [OSTI]

    Phadke, Amol

    2012-01-01

    Unleashing the Potential of Renewable Energy in India.of Potential for Wind Farms in India, Renewable Energy (of Potential for Wind Farms in India, Renewable Energy (

  13. Gravity as BF theory plus potential

    E-Print Network [OSTI]

    Kirill Krasnov

    2009-07-23

    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.

  14. Infinite potential well with a sinusoidal bottom

    E-Print Network [OSTI]

    A. D. Alhaidari; H. Bahlouli

    2008-08-07

    We construct a tridiagonal matrix representation of the wave operator that maps the wave equation into a three-term recursion relation for the expansion coefficients of the wavefunction. Finding a solution of the recursion relation is equivalent to solving the original problem. Consequently, a larger class of solvable potentials is obtained. The usual diagonal representation constraint results in a reduction to the conventional class of solvable potentials. To exhibit the power of this approach, we give an exact solution for the infinite potential well with sinusoidal bottom.

  15. Adiabatic hyperspherical analysis of realistic nuclear potentials

    E-Print Network [OSTI]

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

    2015-03-20

    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.

  16. Atomistic Potentials for Palladium-Silver Hydrides

    E-Print Network [OSTI]

    Hale, L M; Zimmerman, J A; Zhou, X

    2013-01-01

    New EAM potentials for the ternary palladium-silver-hydrogen system are developed by extending a previously developed palladium-hydrogen potential. The ternary potentials accurately capture the heat of mixing and structural properties associated with solid solution alloys of palladium-silver. Stable hydrides are produced with properties that smoothly transition across the compositions. Additions of silver to palladium are predicted to alter the properties of the hydrides by decreasing the miscibility gap and increasing the likelihood of hydrogen atoms occupying tetrahedral interstitial sites over octahedral interstitial sites.

  17. Line Integral of the Electric Field 42 Potential Difference and the Potential Function 44

    E-Print Network [OSTI]

    integrals of the (2) #12;THE ELECTRIC POTENTIAL 43 / / / / / / / / / //ro / -/ / / / / / / fields calculated2.1 2.2 2.3 2.4 2.5 Line Integral of the Electric Field 42 Potential Difference and the Potential Charged Disk 51 Divergence of a Vector Function 56 Gauss's Theorem and the Differential Form of Gauss

  18. Fuel Efficiency of New European HD Vehicles

    Broader source: Energy.gov [DOE]

    Presentation given at the 2007 Diesel Engine-Efficiency & Emissions Research Conference (DEER 2007). 13-16 August, 2007, Detroit, Michigan. Sponsored by the U.S. Department of Energy's (DOE) Office of FreedomCAR and Vehicle Technologies (OFCVT).

  19. Distributed Light Sensing with Convex Potential Fibers

    E-Print Network [OSTI]

    Sorin, Fabien

    We report on a photoconductive fiber that supports decaying and convex electrical potential profiles capable of localizing a point of illumination, and propose a scheme to perform distributed optical sensing.

  20. Quarkonium dissociation at finite chemical potential

    E-Print Network [OSTI]

    Uttam Kakade; Binoy Krishna Patra

    2015-07-24

    We have studied the dissociation of quarkonia states in a deconfined medium of quarks and gluons at the 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 the Facility for Anti-proton and Ion Research(FAIR), 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 1.4$\\mu_c$ in the temperature range 20-50 $MeV$, which can indirectly help to locate the point on the QCD phase diagram at the large chemical potential and low-temperature zone.

  1. Applying supersymmetry to energy dependent potentials

    SciTech Connect (OSTI)

    Yekken, R.; Lassaut, M.; Lombard, R.J.

    2013-11-15

    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.

  2. Lattice study of hybrid static potentials

    E-Print Network [OSTI]

    Philipp Wolf; Marc Wagner

    2015-02-02

    We report about a recently started project with the aim to compute hybrid static potentials using lattice gauge theory. First preliminary results for pure SU(2) Yang-Mills theory are presented.

  3. Momentum space trigonometric Rosen-Morse potential

    E-Print Network [OSTI]

    C. B. Compean; M. Kirchbach

    2009-08-20

    We transform the trigonometric S wave Rosen-Morse potential to momentum space in employing its property of being a harmonic angular function on the three dimensional hypersphere S^3.

  4. Potential of geothermal energy in China

    E-Print Network [OSTI]

    Sung, Peter On

    2010-01-01

    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 ...

  5. Tiny Glass Bubbles With Big Potential

    Broader source: Energy.gov [DOE]

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

  6. Managing Milk Composition: Evaluating Herd Potential 

    E-Print Network [OSTI]

    Stokes, Sandra R.; Jordan, Ellen R.; Looper, Mike; Waldner, Dan

    2000-12-11

    : Evaluating Herd Potential Sandra R. Stokes, Dan N. Waldner, Ellen R. Jordan, and Michael L. Looper* * Respectively, Extension Dairy Specialist, The Texas A&M University System; Extension Dairy Specialist, Oklahoma State University; Ex- tension Dairy...

  7. Deriving effective mesoscale potentials from atomistic simulations

    E-Print Network [OSTI]

    Dirk Reith; Mathias Puetz; Florian Mueller-Plathe

    2002-11-20

    We demonstrate how an iterative method for potential inversion from distribution functions developed for simple liquid systems can be generalized to polymer systems. It uses the differences in the potentials of mean force between the distribution functions generated from a guessed potential and the true (simulated) distribution functions to improve the effective potential successively. The optimization algorithm is very powerful: convergence is reached for every trial function in few iterations. As an extensive test case we coarse-grained an atomistic all-atom model of poly (isoprene) (PI) using a 13:1 reduction of the degrees of freedom. This procedure was performed for PI solutions as well as for a PI melt. Comparisons of the obtained force fields are drawn. They prove that it is not possible to use a single force field for different concentration regimes.

  8. Energy saving potential of various roof technologies

    E-Print Network [OSTI]

    Ray, Stephen D. (Stephen Douglas)

    2010-01-01

    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, ...

  9. Potential Economic Value of Seasonal Hurricane Forecasts

    E-Print Network [OSTI]

    Emanuel, Kerry Andrew

    This paper explores the potential utility of seasonal Atlantic hurricane forecasts to a hypothetical property insurance firm whose insured properties are broadly distributed along the U.S. Gulf and East Coasts. Using a ...

  10. Confining potential and mass of elementary particles

    E-Print Network [OSTI]

    L. I. Buravov

    2014-11-21

    In this paper we consider a model in which the masses of elementary particles are formed and stabilized thanks to confining potential, which is caused by recoil momentum at emission of specific virtual bosons by particle itself. The calculation of this confining potential is carried out. It is shown that $\\Phi$(R) may be in the form const $R^3$ or const $R^2$ depending on continuous or discrete nature of the spectrum of emitted bosons.

  11. Industrial Energy Conservation Potentials in North Carolina 

    E-Print Network [OSTI]

    Barakat, M. G.; Singh, H.; Mallik, A. K.

    1987-01-01

    CONSERVATION POTENTIALS IN NORTH CAROLINA MONJED G. BARAKAT Chief Engineer Energy Analysis and Diagnostic Center North Carolina A & T State University HARMOHINDAR SINGH Associate Professor Architectural Engineering Department North Carolina A... of payback periods less than a year. These energy conservation opportunities and their potential savings in the state of North Carolina are discussed in this paper. INTRODUCTION Maximizing profit and minimizing operating cost are the the major driving...

  12. On the Chemical Potential of Dark Energy

    E-Print Network [OSTI]

    S. H. Pereira

    2008-06-23

    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.

  13. Missing solution in a Cornell potential

    SciTech Connect (OSTI)

    Castro, L.B.; Castro, A.S. de

    2013-11-15

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

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

    E-Print Network [OSTI]

    Mistry, Karan Hemant

    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 ...

  15. Potential effects of gallium on cladding materials

    SciTech Connect (OSTI)

    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.

    1997-10-01

    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.

  16. Analytic models of plausible gravitational lens potentials

    SciTech Connect (OSTI)

    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)

    2009-01-15

    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.

  17. On The Potential of Minimal Flavour Violation

    E-Print Network [OSTI]

    R. Alonso; M. B. Gavela; L. Merlo; S. Rigolin

    2011-06-06

    Assuming the Minimal Flavour Violation hypothesis, we derive the general scalar potential for fields whose background values are the Yukawa couplings. We analyze the minimum of the potential and discuss the fine-tuning required to dynamically generate the mass hierarchies and the mixings between different quark generations. Two main cases are considered, corresponding to Yukawa interactions being effective operators of dimension five or six (or, equivalently, resulting from bi-fundamental and fundamental scalar fields, respectively). At the renormalizable and classical level, no mixing is naturally induced from dimension five Yukawa operators. On the contrary, from dimension six Yukawa operators one mixing angle and a strong mass hierarchy among the generations result.

  18. Effective Potential Energy Expression for Membrane Transport

    E-Print Network [OSTI]

    Robert W. Finkel

    2007-02-11

    All living cells transport molecules and ions across membranes, often against concentration gradients. This active transport requires continual energy expenditure and is clearly a nonequilibrium process for which standard equilibrium thermodynamics is not rigorously applicable. Here we derive a nonequilibrium effective potential that evaluates the per particle transport energy invested by the membrane. A novel method is used whereby a Hamiltonian function is constructed using particle concentrations as generalized coordinates. The associated generalized momenta are simply related to the individual particle energy from which we identify the effective potential. Examples are given and the formalism is compared with the equilibrium Gibb's free energy.

  19. The three-baryon $?NN$ potential

    E-Print Network [OSTI]

    A. A. Usmani

    1995-03-27

    Using a three-baryon $\\Lambda NN$ potential having a spin-independent dispersive and a two-pion exchange components, realistic variational Monte Carlo calculations have been performed for the $\\Lambda$-seperation energy for $^{5}_{\\Lambda}$He. A relationship between strengths associated with both pieces of $\\Lambda NN$ force giving exact experimental $\\Lambda$-seperation energy has been obtained which then combined with our previous study on $^{17}_{\\,\\,\\Lambda}$O hypernucleus determines a unique and acceptable set of strength parameters for $\\Lambda NN$ potential. The $\\Lambda NN$ force is found important for the core polarization.

  20. Fly Ash Characteristics and Carbon Sequestration Potential

    SciTech Connect (OSTI)

    Palumbo, Anthony V.; Amonette, James E.; Tarver, Jana R.; Fagan, Lisa A.; McNeilly, Meghan S.; Daniels, William L.

    2007-07-20

    Concerns for the effects of global warming have lead to an interest in the potential for inexpensive methods to sequester carbon dioxide (CO2). One of the proposed methods is the sequestration of carbon in soil though the growth of crops or forests.4,6 If there is an economic value placed on sequestration of carbon dioxide in soil there may be an an opportunity and funding to utilize fly ash in the reclamation of mine soils and other degraded lands. However, concerns associated with the use of fly ash must be addressed before this practice can be widely adopted. There is a vast extent of degraded lands across the world that has some degree of potential for use in carbon sequestration. Degraded lands comprise nearly 2 X 109 ha of land throughout the world.7 Although the potential is obviously smaller in the United States, there are still approximately 4 X 106 ha of degraded lands that previously resulted from mining operations14 and an additional 1.4 X 108 ha of poorly managed lands. Thus, according to Lal and others the potential is to sequester approximately 11 Pg of carbon over the next 50 years.1,10 The realization of this potential will likely be dependent on economic incentives and the use of soil amendments such as fly ash. There are many potential benefits documented for the use of fly ash as a soil amendment. For example, fly ash has been shown to increase porosity, water-holding capacity, pH, conductivity, and dissolved SO42-, CO32-, HCO3-, Cl- and basic cations, although some effects are notably decreased in high-clay soils.8,13,9 The potential is that these effects will promote increased growth of plants (either trees or grasses) and result in greater carbon accumulation in the soil than in untreated degraded soils. This paper addresses the potential for carbon sequestration in soils amended with fly ash and examines some of the issues that should be considered in planning this option. We describe retrospective studies of soil carbon accumulation on reclaimed mine lands, leaching studies of fly ash and carbon sorption studies of fly ash.

  1. Correlation of action potentials in adjacent neurons

    E-Print Network [OSTI]

    Shneider, M N

    2015-01-01

    A possible mechanism for the synchronization of action potential propagation along a bundle of neurons (ephaptic coupling) is considered. It is shown that this mechanism is similar to the salutatory conduction of the action potential between the nodes of Ranvier in myelinated axons. The proposed model allows us to estimate the scale of the correlation, i.e., the distance between neurons in the nervous tissue, wherein their synchronization becomes possible. The possibility for experimental verification of the proposed model of synchronization is discussed.

  2. Quantum Electric Field Fluctuations and Potential Scattering

    E-Print Network [OSTI]

    Haiyun Huang; L. H. Ford

    2015-03-10

    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.

  3. Quantum Electric Field Fluctuations and Potential Scattering

    E-Print Network [OSTI]

    Huang, Haiyun

    2015-01-01

    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.

  4. ANAEROBIC RUMEN FUNGI: POTENTIAL AND APPLICATIONS

    E-Print Network [OSTI]

    Griffith, Gareth

    between counts of rumen anaerobic fungi and the voluntary intake of low digestibility herbage suggestsANAEROBIC RUMEN FUNGI: POTENTIAL AND APPLICATIONS 1 2 Ravinder Nagpal, Anil Kumar Puniya*, Gareth, National Dairy Research Institute, Karnal-132001, India. (*puniya1234@rediffmail.com) Anaerobic fungi

  5. ESTIMATING LIQUEFACTION POTENTIAL IN MID-AMERICA

    E-Print Network [OSTI]

    construction and even more important for retrofit/remedial studies for existing construction because of the potential cost to improve liquefiable soils. The cone penetration test (CPT) offers many advantages over and soil index properties. Relationships were presented for clean sands, silty sands, and silty sands

  6. 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

  7. 2015 Winter and Spring Fire Potential Assessment

    E-Print Network [OSTI]

    2015 Winter and Spring Fire Potential Assessment For the Grass Dominant Fuels on the Western Plains Factors · Fine Fuel Conditions · Drought · Seasonal Temperature and Precipitation #12;Grass Dominant Fuels Grass dominant fuels are generally found west of the red line shown on the map. During the dormant

  8. BAYESIAN ESTIMATION OF FUEL ECONOMY POTENTIAL

    E-Print Network [OSTI]

    Berger, Jim

    BAYESIAN ESTIMATION OF FUEL ECONOMY POTENTIAL DUE TO TECHNOLOGY IMPROVEMENTS by Richard W. Andrews comments. 4 #12; 1. INTRODUCTION 1.1 Background and Overview In 1975 the Energy Policy and Conservation Act average fuel economy (CAFE) standard. This legislation separates each manufacturer's production

  9. Potential Benefits of Commissioning California Homes

    E-Print Network [OSTI]

    This work was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, OfficeLBNL-48258 Potential Benefits of Commissioning California Homes Nance Matson, Craig Wray, Iain Walker, Max Sherman Environmental Energy Technologies Division Energy Performance of Buildings Group

  10. Renewable Fuel Standard Potential Economic and Environmental

    E-Print Network [OSTI]

    Renewable Fuel Standard Potential Economic and Environmental Effects of U.S. Biofuel Policy Wallace. Burke (Cochair)2--Ecology Wallace E. Tyner (Cochair)2--Energy Economics Virginia H. Dale. Miranowski--Agricultural Economics Aristides Patrinos--Renewable Fuel Production Jerald L. Schnoor3--Water

  11. Potential of Magnetic Mirrors Development of

    E-Print Network [OSTI]

    Potential of Magnetic Mirrors Development of Fusion Energy Science: Physics, Materials, Blankets Simulation and Validation #12;Axisymmetric Mirrors · Circular Coils without Thermal Barriers ­ Simplified of Construction and Maintenance #12;A Simple Mirror can be MHD Stable · Seven Tested Methods 1.Expander plasma

  12. Motion Planning with Gamma-Harmonic Potential

    E-Print Network [OSTI]

    Masoud, Ahmad A.

    to the target. The approach is easily adaptable to planning in a cluttered environment containing a vector drift flowing in a nonhomogeneous conducting medium. The resulting potential field is known as the gamma for the incremental construction of a representation. Another important issue is to increase the diversity

  13. Center for Diesel Research Potential Efficiency Improvement

    E-Print Network [OSTI]

    Minnesota, University of

    Center for Diesel Research Potential Efficiency Improvement by Accessory Load Reduction on Hybrid University of Minnesota Center for Diesel Research #12;Center for Diesel Research Acknowledgements · Jeff;Center for Diesel Research Transit Energy Use and Cost · 633 M gallons diesel used for US transit in 2010

  14. Research Articles Potential for Microbial Oxidation

    E-Print Network [OSTI]

    Johnson, Clark M.

    research has suggested that Fe(II) in BG can serve as an energy source for chemolithotrophic microbial that may have served or may serve as energy sources for chemolithotrophic microbial activity. This specResearch Articles Potential for Microbial Oxidation of Ferrous Iron in Basaltic Glass Mai Yia Xiong

  15. LABORATORY IV: ELECTRIC FIELD AND POTENTIAL

    E-Print Network [OSTI]

    Minnesota, University of

    LABORATORY IV: ELECTRIC FIELD AND POTENTIAL Lab IV - 1 Many forces in nature cannot be modeled of new devices. The problems in this laboratory are primarily designed to give you practice visualizing. In this laboratory, you will first explore electric fields by building different configurations of charged objects

  16. Cellulose Graft Copolymers for Potential Adhesive Applications

    E-Print Network [OSTI]

    Narayan, Ramani

    Chapter 24 Cellulose Graft Copolymers for Potential Adhesive Applications Bonding of Plastics interfacial adhesion between the wood and polystyrene components because of their inherent incompatibility, Corvallis, OR 97331 0097-6156/89/0385-0337$06.00/0 Q 1989 American Chemical Society #12;338 ADHESIVES FROM

  17. Exploring Potential Energy Surfaces for Enzymatic Reactions

    E-Print Network [OSTI]

    Schlegel, H. Bernhard

    high-level molecular orbital theory, while the most distant parts of the system are treated using low-cost) method to fit charges for QM region with capping hydrogens · QM/MM optimization with new RESP charges. aeolicus (PDB entry 2NWS) · Simulated annealing and MD to prepare complex · 2 dimensional reduced potential

  18. The Sign Problem via Imaginary Chemical Potential

    E-Print Network [OSTI]

    K. Splittorff; B. Svetitsky

    2007-05-21

    We calculate an analogue of the average phase factor of the staggered fermion determinant at imaginary chemical potential. Our results from the lattice agree well with the analytical predictions in the microscopic regime for both quenched and phase-quenched QCD. We demonstrate that the average phase factor in the microscopic domain is dominated by the lowest-lying Dirac eigenvalues.

  19. Orographic Precipitation in Potentially Unstable Alpine Storms

    E-Print Network [OSTI]

    Houze Jr., Robert A.

    Orographic Precipitation in Potentially Unstable Alpine Storms: MAP IOPs 2b, 3, and 5 Socorro, ICAM/MAP Meeting, Brig, Switzerland, 19-23 May. See Following Pages #12;Orographic Precipitation ahead of strong baroclinic troughs. This pattern is commonly associated with large precipitation amounts

  20. Physics Potential of Solar Neutrino Experiments

    E-Print Network [OSTI]

    A. B. Balantekin; H. Yuksel

    2003-12-19

    We discuss the physics potential of the solar neutrino experiments i) To explore the parameter space of neutrino mass and mixings; ii) To probe the physics of the Sun; iii) To explore nuclear physics of the neutrino-target interactions. Examples are given for these three classes.

  1. North Carolina State University, Campus Box 7409, Raleigh, NC 27695 | 919-515-3480 | www.nccleantech.ncsu.edu | 8/2013 Advancing Clean Energy for a Sustainable Economy

    E-Print Network [OSTI]

    sourced from landfills. Vehicles Dedicated natural gas vehicles (NGV) are designed to run only on CNG emissions than bi-fuel vehicles because their engines are optimized on a particular fuel. NGV offerings from

  2. Hydrogen, Fuel Cells, and Infrastructure Technologies FY 2002 Progress Report Section III. Hydrogen Storage

    E-Print Network [OSTI]

    verification and validation tests based on NGV2- 2000, modified for high pressure hydrogen · Supply fully system under NGV 3.1 standards · Designed and developed industry's first hydrogen 10,000 psi (700 bar) in

  3. High Vowel Fricativization and Chain Shift

    E-Print Network [OSTI]

    Faytak, Matthew

    2014-01-01

    Aghem – 0 Isu – U, u Oku – (v)@, uo PCR – *u Ngv@@ Kom –v Ngv Chicken mbv´ mbv` U Death ´e-v´ v:U Ey-kuo @-kv *-kuo

  4. Computation of the Ramsey Numbers R(C4, K9) and R(C4, K10)

    E-Print Network [OSTI]

    Radziszowski, Stanislaw P.

    ) is the vertex set; E(G) is the edge set; NG(v) is the neighborhood of v V (G); degG(v) is |NG(v)|; (G

  5. Development of a Compressed Hydrogen Gas

    E-Print Network [OSTI]

    ,321,775 (Gas Manifold, Nov 2001) NGV versions safety certified to FMVSS # 304 and undergoing long · Design » T700 carbon fiber overwrap with high interspersed winding pattern with design FOS of 2.45 » NGV

  6. De nitions and -conversion in Type Theory y Fairouz Kamareddine z, Roel Bloox and Rob Nederpelt {

    E-Print Network [OSTI]

    Kamareddine, Fairouz

    ]. The exception for this are some Automath languages in NGV 95] and the current work of KN 94] and KN 95b]. We to intuition in the most usual applications. However, experiences with the Automath-languages ( NGV 95

  7. A TIME EFFICIENT ADAPTIVE GRIDDING APPROACH AND IMPROVED CALIBRATIONS IN

    E-Print Network [OSTI]

    Camci, Cengiz

    of the Nozzle Guide Vane (NGV) assembly of a low-speed, large-scale, single-stage, axial flow turbine. The cold from 336 to 868, an increase of 160%. Flow structures behind the NGV measurement plane are identified

  8. North Carolina State University, Campus Box 7409, Raleigh, NC 27695 | 919-515-3480 | www.ncsc.ncsu.edu | 8/2013 Advancing Clean Energy for a Sustainable Economy

    E-Print Network [OSTI]

    vehicles (NGV) are designed to run only on CNG, whereas bi-fuel vehicles have two separate fueling systems on a particular fuel. NGV offerings from original equipment manufacturers are expanding from Honda's Civic

  9. A Lifecycle Emissions Model (LEM): Lifecycle Emissions from Transportation Fuels, Motor Vehicles, Transportation Modes, Electricity Use, Heating and Cooking Fuels, and Materials

    E-Print Network [OSTI]

    Delucchi, Mark

    2003-01-01

    and 4.5 g/mi CH4 for the NGV, one now enters 9.0 g/mi CO foremissions of 0.50 for the NGV. To the extent that the

  10. Time-and Frequency-Domain Measurements for an Active Negative Group Delay Circuit

    E-Print Network [OSTI]

    Mojahedi, Mohammad

    unusual properties, namely a negative refractive index (NRI) and a negative group velocity (NGV) in the same frequency band [1­3]. The NRI is equivalent to a negative phase delay, and the NGV is equiv- alent

  11. Polarizable interaction potential for water from coupled cluster calculations. I. Analysis of dimer potential energy surface

    E-Print Network [OSTI]

    by nonadditive effects which make it impossible to sufficiently accurately represent the energy of water as a sumPolarizable interaction potential for water from coupled cluster calculations. I. Analysis of dimer potential energy surface Robert Bukowski,1 Krzysztof Szalewicz,1,a Gerrit C. Groenenboom,2 and Ad van der

  12. Transfer between the cesium 6 {sup 2}P{sub 1/2} and 6 {sup 2}P{sub 3/2} levels induced by collisions with H{sub 2}, HD, D{sub 2}, CH{sub 4}, C{sub 2}H{sub 6}, CF{sub 4}, and C{sub 2}F{sub 6}

    SciTech Connect (OSTI)

    Pitz, Greg A.; Fox, Charles D.; Perram, Glen P.

    2011-09-15

    The cross sections of spin-orbit energy exchange between the cesium 6 {sup 2}P{sub 1/2}{r_reversible}6 {sup 2}P{sub 3/2} states induced by collisions with N{sub 2}, H{sub 2}, HD, D{sub 2}, CH{sub 4}, C{sub 2}H{sub 6}, CF{sub 4}, and C{sub 2}F{sub 6} were obtained for pressures less than 100 Torr at room temperature by means of steady-state laser-induced fluorescence techniques. The spin-orbit energy exchange rate with N{sub 2}, H{sub 2}, HD, D{sub 2}, CH{sub 4}, C{sub 2}H{sub 6}, CF{sub 4}, and C{sub 2}F{sub 6}, have been measured as {sigma}{sub 21}(6 {sup 2}P{sub 3/2}{yields}6 {sup 2}P{sub 1/2})= 16.3, 34.1, 30.0, 22.7, 21.4, 65.6, 64.8, and 137 A{sup 2} and {sigma}{sub 12}(6 {sup 2}P{sub 1/2}{yields}6 {sup 2}P{sub 3/2})= 1.8, 4.4, 4.1, 3.0, 2.9, 13.3, 9.7, and 16.3 A{sup 2}, respectively. Correlations of the spin-orbit transfer probabilities with rotational-energy defect and vibrational-energy defect have been shown.

  13. A reduction relation for which postponement of K-contractions, Conservation and Preservation of Strong Normalisation hold

    E-Print Network [OSTI]

    Kamareddine, Fairouz

    of Strong Normali- sation for e is easy to establish yet when editing NGV 94], he retracted his assumption

  14. WEDNESDAY, APRIL 2 6:008:00 pm RReeggiissttrraattiioonn aanndd NNeettwwoorrkkiinngg RReecceeppttiioonn ((lliigghhtt ffaarree))

    E-Print Network [OSTI]

    Renewable Energy Laboratory Stephe Yborra, NGV America Joan Ogden, US Davis Discussion 9:25 am BBrreeaakk 9

  15. WORKSHOP OBJECTIVES: Convene industry and other stakeholders to share current

    E-Print Network [OSTI]

    -in and Continental Breakfast 8:30­9:00 AM NGV and FCV Transportation Perspectives n Matt Fronk, Matt Fronk

  16. A Note on Edge Contraction Thomas Wolle and Hans L. Bodlaender

    E-Print Network [OSTI]

    Utrecht, Universiteit

    . Most of our terminol- ogy is standard graph theory/algorithm terminology. The open neighbourhood NG(v

  17. 27/06//01 TNT W. A. Pearlman

    E-Print Network [OSTI]

    and Director, Center for Next Generation Video Rensselaer Polytechnic Institute http://www.rpi.edu/web/NGV http

  18. Research Summary Hoai-Minh Nguyen

    E-Print Network [OSTI]

    Weinberger, Hans

    in greater depth. Electromagnetic waves. (Section 2) [Ng6, NgV2, Ng9, NgV1, HJNg1, HJNg2] The main topics. Cloaking. (Section 2.1; [Ng6, NgV2, Ng9]) A region of space is cloaked for a class of measurements this singularity, various regularized schemes have been proposed. My work on cloaking [Ng6, NgV2, Ng9] (with

  19. The context calculus c Extended Abstract

    E-Print Network [OSTI]

    de Vrijer, Roel

    of abbreviations in the proof­checkers family Automath (see [NGV94]). Tech­ nically, segments can be characterized

  20. 26/07//01 TNT W. A. Pearlman

    E-Print Network [OSTI]

    and Director, Center for Next Generation Video Rensselaer Polytechnic Institute http://www.rpi.edu/web/NGV http

  1. ENUMERATING LABELLED GRAPHS WITH CERTAIN NEIGHBORHOOD

    E-Print Network [OSTI]

    McSorley, John

    of G is #E(G). The sets NG(v) = {w V (G) : vw E(G)} and NG[v] = NG(v){v} are the open neighborhood and closed neighborhood of v in G, respectively. The collection NG[v]vV (G) (respectively, NG(v)vV (G neighborhood family of G is Sperner u = v V (G), NG[u] NG[v] and NG[v] NG[u], whose negation is (2

  2. Kaonic hydrogen atoms with realistic potentials

    SciTech Connect (OSTI)

    Yan, Y.; Poonsawat, W.; Khosonthongkee, K.; Kobdaj, C.; Suebka, P.

    2010-06-15

    Kaonic hydrogen is studied with various realistic potentials in an accurate numerical approach based on Sturmian functions. It is found that the mass difference between the K{sup -}p and K-bar{sup 0}n channels has a considerable effect on theoretical results of the energy shift and decay width of kaonic hydrogen. On average, the theoretical result in the isospin symmetry limit is smaller by a factor of about 20% than the full result where the mass difference between the K{sup -}p and K-bar{sup 0}n channels is properly treated. The theoretical results based on realistic local potentials, which reproduce well scattering data, are inconsistent with the recent measurement of the energy shift and decay width of the 1s kaonic hydrogen state by the DEAR Collaboration.

  3. Semimetalic graphene in a modulated electric potential

    E-Print Network [OSTI]

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

    2008-09-09

    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.

  4. Chemical potential and the gap equation

    E-Print Network [OSTI]

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

    2008-07-17

    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.

  5. Potential for cogeneration in Maryland. Volume 1

    SciTech Connect (OSTI)

    Not Available

    1993-03-01

    Cogeneration is a name given to energy systems that produce both electric power and useful thermal energy such as steam. While cogeneration markets have flourished in California, Texas, and some states, those in Maryland have not. A primary reason is that the industries that have been targeted in other states--e.g., oil refining, pulp and paper, chemicals, food processing--are not major elements of Maryland's industrial base. The study estimates the potential for future cogeneration in Maryland, both large units and small packaged systems, and assesses the potential impact of cogeneration systems on Maryland's energy needs between now and 2005. The study is presented in three volumes. Because of significant differences between large- and small-scale cogeneration, the analysis of these two systems was performed separately. This volume is a summary document presenting the findings from both studies.

  6. Probing quintessence potential with future cosmological surveys

    SciTech Connect (OSTI)

    Takeuchi, Yoshitaka [Department of Physics and Astrophysics, Nagoya University, Nagoya 464-8602 (Japan); Ichiki, Kiyotomo [Kobayashi-Maskawa Institute for the origin of particles and the universe, Nagoya University, Nagoya 464-8602 (Japan); Takahashi, Tomo [Department of Physics, Saga University, Saga 840-8502 (Japan); Yamaguchi, Masahide, E-mail: yoshitaka@nagoya-u.jp, E-mail: ichiki@a.phys.nagoya-u.ac.jp, E-mail: tomot@cc.saga-u.ac.jp, E-mail: gucci@phys.titech.ac.jp [Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551 (Japan)

    2014-03-01

    Quintessence, a scalar field model, has been proposed to account for the acceleration of the Universe at present. We discuss how accurately quintessence models are discriminated by future cosmological surveys, which include experiments of CMB, galaxy clustering, weak lensing, and the type Ia SNe surveys, by making use of the conventional parameterized dark energy models. We can see clear differences between the thawing and the freezing quintessence models at more than 1? (2?) confidence level as long as the present equation of state for quintessence is away from -1 as w{sub X}?>?0.95(?0.90). However, it is found to be difficult to probe the effective mass squared for the potential in thawing models, whose signs are different between the quadratic and the cosine-type potentials. This fact may require us to invent a new estimator to distinguish quintessence models beyond the thawing and the freezing ones.

  7. Yukawa particles in a confining potential

    SciTech Connect (OSTI)

    Girotto, Matheus Levin, Yan; Santos, Alexandre P. dos; Colla, Thiago

    2014-07-07

    We study the density distribution of repulsive Yukawa particles confined by an external potential. In the weak coupling limit, we show that the mean-field theory is able to accurately account for the particle distribution. In the strong coupling limit, the correlations between the particles become important and the mean-field theory fails. For strongly correlated systems, we construct a density functional theory which provides an excellent description of the particle distribution, without any adjustable parameters.

  8. Quantum Potential Via General Hamilton - Jacobi Equation

    E-Print Network [OSTI]

    Maedeh Mollai; Mohammad Razavi; Safa Jami; Ali Ahanj

    2011-10-29

    In this paper, we sketch and emphasize the automatic emergence of a quantum potential (QP) in general Hamilton-Jacobi equation via commuting relations, quantum canonical transformations and without the straight effect of wave function. The interpretation of QP in terms of independent entity is discussed along with the introduction of quantum kinetic energy. The method has been extended to relativistic regime, and same results have been concluded.

  9. The IAEA: Neutralizing Iraq's nuclear weapons potential

    SciTech Connect (OSTI)

    Zifferero, M.

    1993-04-01

    With support from UNSCOM and staff members from several countries, the IAEA has succeeded in identifying and destroying most of Iraq's nuclear weapons potential. IAEA activities in Iraq have also established a sound basis for long-term monitoring of Iraq. This will involve several procedures and techniques, including the periodic monitoring of Iraq's main bodies of water and unannounced visits of resident inspectors to plants, factories, and research centers.

  10. Nonlinear Lattice Waves in Random Potentials

    E-Print Network [OSTI]

    Sergej Flach

    2014-09-10

    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.

  11. Polymer escape from a confining potential

    E-Print Network [OSTI]

    Harri Mökkönen; Timo Ikonen; Tapio Ala-Nissila; Hannes Jónsson

    2015-03-26

    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.

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

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

    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...

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

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

    Global Warming Potential Refrigerants - 2013 Peer Review Thermodynamic Evaluation of Low-Global Warming Potential Refrigerants - 2013 Peer Review Emerging Technologies Project for...

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

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

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

  15. 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...

  16. Assessment of Energy Production Potential from Ocean Currents...

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

    Assessment of Energy Production Potential from Ocean Currents along the United States Coastline Assessment of Energy Production Potential from Ocean Currents along the United...

  17. The Energy Efficiency Potential of Global Transport to 2050 ...

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

    The Energy Efficiency Potential of Global Transport to 2050 The Energy Efficiency Potential of Global Transport to 2050 Broad view of sustainability of global transportation...

  18. The Potential of Private Institutional Investors for the Financing...

    Open Energy Info (EERE)

    The Potential of Private Institutional Investors for the Financing of Transport Infrastructure Jump to: navigation, search Tool Summary LAUNCH TOOL Name: The Potential of Private...

  19. Clean Energy Policy Analysis: Impact Analysis of Potential Clean...

    Energy Savers [EERE]

    Policy Analysis: Impact Analysis of Potential Clean Energy Policy Options for the Hawaii Clean Energy Initiative Clean Energy Policy Analysis: Impact Analysis of Potential...

  20. NREL: Energy Efficiency Potential Mapping (Analysis & Tools for...

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

    Energy Efficiency Potential Mapping (Analysis & Tools for Building America and Industry - 2015 Peer Review NREL: Energy Efficiency Potential Mapping (Analysis & Tools for Building...

  1. Electrochemical Surface Potential due to Classical Point Charge...

    Office of Scientific and Technical Information (OSTI)

    Potential due to Classical Point Charge Models Drives Anion Adsorption to the Air-Water Interface Citation Details In-Document Search Title: Electrochemical Surface Potential...

  2. Meeting Concerning Potential Test Procedures and Energy Conservation...

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

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

  3. Unlocking the Potential of Additive Manufacturing in the Fuel...

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

    Unlocking the Potential of Additive Manufacturing in the Fuel Cells Industry Unlocking the Potential of Additive Manufacturing in the Fuel Cells Industry Download presentation...

  4. 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...

  5. 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...

  6. Self Potential At Blue Mountain Geothermal Area (Fairbank Engineering...

    Open Energy Info (EERE)

    Self Potential At Blue Mountain Geothermal Area (Fairbank Engineering Ltd, 2003) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Self Potential...

  7. Energy Department Releases Report, Evaluates Potential for Wind...

    Energy Savers [EERE]

    Energy Department Releases Report, Evaluates Potential for Wind Power in All 50 States Energy Department Releases Report, Evaluates Potential for Wind Power in All 50 States May...

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

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

    foreign and domestic oil and gas resources, reserves, and production potential. As a policy-neutral agency, EIAs standard analysis of the potential of the Alaska North Slope...

  9. NREL: Energy Efficiency Potential Mapping (Analysis & Tools for...

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

    NREL: Energy Efficiency Potential Mapping (Analysis & Tools for Building America and Industry - 2015 Peer Review NREL: Energy Efficiency Potential Mapping (Analysis & Tools for...

  10. 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...

  11. Home Energy Score Program: Update and Overview for Potential...

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

    Score Program: Update and Overview for Potential Partners Home Energy Score Program: Update and Overview for Potential Partners Provides an overview of DOE's objectives for the...

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

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

    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...

  13. Wind Concurrent Cooling Could Increase Power Transmission Potential...

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

    Concurrent Cooling Could Increase Power Transmission Potential by as Much as 40% Wind Concurrent Cooling Could Increase Power Transmission Potential by as Much as 40% May 18, 2015...

  14. Webinar November 19: Potential Strategies for Integrating Solar...

    Office of Environmental Management (EM)

    Webinar November 19: Potential Strategies for Integrating Solar Hydrogen Production and Concentrating Solar Power: A Systems Analysis Webinar November 19: Potential Strategies for...

  15. 3-D Combustion Simulation Strategy Status, Future Potential,...

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

    Combustion Simulation Strategy Status, Future Potential, and Application Issues 3-D Combustion Simulation Strategy Status, Future Potential, and Application Issues 2004 Diesel...

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

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

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

  17. Economic Potential of CHP in Detroit Edison Service Area: The...

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

    Economic Potential of CHP in Detroit Edison Service Area: The Customer Perspective, June 2003 Economic Potential of CHP in Detroit Edison Service Area: The Customer Perspective,...

  18. Technology Key to Harnessing Natural Gas Potential | Department...

    Office of Environmental Management (EM)

    Technology Key to Harnessing Natural Gas Potential Technology Key to Harnessing Natural Gas Potential July 18, 2012 - 3:52pm Addthis Deputy Secretary Daniel Poneman tours Proinlosa...

  19. Bandwidth Study on Energy Use and Potential Energy Saving Opportunitie...

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

    Bandwidth Study on Energy Use and Potential Energy Saving Opportunities in U.S. Chemical Manufacturing i , ii Bandwidth Study on Energy Use and Potential Energy Saving...

  20. 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...

  1. EPA Clean Energy Incentive Program Stakeholder Calls - Potential...

    Energy Savers [EERE]

    Energy Incentive Program Stakeholder Calls - Potential CEIP Project Partners EPA Clean Energy Incentive Program Stakeholder Calls - Potential CEIP Project Partners November 23,...

  2. Preprintreihe SFB 478 Geometrische Strukturen in der Mathematik

    E-Print Network [OSTI]

    ) for families F G. We construct a G-pushout V M G ×NGV ENGV V M idG ×fV i // EG V M G ×NGV EWGV // EG := NGH/H. We will say that G satisfies (NMFINVCY) if it satisfies (MFINVCY) and NGV = V , i.e., WGV = {1

  3. EuROPEAN MICROWAVE ASSOCIATION Proceedings of the European Microwave Association Vol. ?; 2008.

    E-Print Network [OSTI]

    Brest, Université de

    velocity (NGV) and superluminal group velocity (faster than the speed of light in vacuum c) that occur causality. In the case of artificial lines with resonant cells that exhibit NGV in narrow frequency band [5 through pulse reshaping. In region of anomalous dispersion, NGV is always associated with high

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

    E-Print Network [OSTI]

    Camci, Cengiz

    -95843 INFLUENCE OF LEADING EDGE FILLET AND NONAXISYMMETRIC CONTOURED ENDWALL ON TURBINE NGV EXIT FLOW STRUCTURE. The NGV exit flow structure was examined under the influence of a 29 bladed high pressure turbine rotor endwall is installed in the nozzle guide vane (NGV) passage. It has a constant thickness

  5. Shuo Wen Jie Zi -- Dianzi Ban: Digital Recension of the Eastern Han Chinese Grammaticon

    E-Print Network [OSTI]

    Cook, Richard Jr.

    2003-01-01

    y \\v fsfta? 1 $ * % fi es] ngv imi n jvz jfy imi iun dpi mnaa, krt, 11 la x , f l mqf, f l ngv, S n w m , iqc). 1 chk 1o, *5lxb, |§ m ee , Mmkk, IS ngv, IS ngw, |ft nhd, S n m m ,

  6. Max-and Min-Neighborhood Monopolies Kazuhisa Makino

    E-Print Network [OSTI]

    Kameda, Tsunehiko "Tiko"

    the neighborhood of v by NG(v) = {v} {w | (w, v) E}. A vertex v V is said to be controlled by a vertex set M V if the majority of its neighbors are in M; i.e., |NG(v) M| |NG(v)|/2. (1) Here we use a non-strict majority

  7. IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 52, NO. 5, MAY 2004 1449 Time-Domain Measurement of Negative Group

    E-Print Network [OSTI]

    Mojahedi, Mohammad

    ), metamaterials, negative group delay (NGD), negative group velocity (NGV), negative refractive index (NRI). I. It was initially stated that left handedness was equivalent to having a negative group velocity (NGV) [1], and that an NGV is a necessary characteristic of left-handed metamaterials [2]. Additional conflicting assertions

  8. Phonological Conditions on Affixation

    E-Print Network [OSTI]

    Paster, Mary

    2006-01-01

    consonant-final stems and -ngV with vowel-final stems, wherevowel-final stems take -ngV ((56)c), r-final stems take -environments Nyangumarta -ngV V-final stem -jV C-final stem

  9. Broadcast Domination on block graphs in linear time

    E-Print Network [OSTI]

    Heggernes, Pinar

    the vertices adjacent to v, denoted by NG(v). The degree of a vertex v is defined by degG(v) = |NG(v)|. We also define NG[v] = NG(v){v}. The neighbourhood of a set of vertices S, denoted NG(S), is the set of all

  10. Partial Characterizations of Circle Graphs Flavia Bonomoa,b,1

    E-Print Network [OSTI]

    Bonomo, Flavia

    is denoted by NG(v). Two vertices v, w are false twins in G if they are nonadjacent and NG(v) = NG(w), while they are true twins in G if they are false twins in G. If H is a subgraph of G, we define NH(v) = NG(v) V (H

  11. The Household Market for Electric Vehicles: Testing the Hybrid Household Hypothesis -- A Reflexively Designed Survey of New-Car-Buying Multi-Vehicle California Households

    E-Print Network [OSTI]

    Turrentine, Thomas; Kurani, Kenneth S.

    2001-01-01

    tn Sttuation Two HEV ¯ RG~ 3 + 2- NGV ÷ 1 .NEV ,REV ¯ CEV 1HEV ©REV m CEVLII x2 R8 n NGV i i c2 l I Note. Tnp purposesgas powered sedan is an NGV an EVbody style. Bodystyles are

  12. FUEL CYCLE POTENTIAL WASTE FOR DISPOSITION

    SciTech Connect (OSTI)

    Jones, R.; Carter, J.

    2010-10-13

    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.

  13. FUEL CYCLE POTENTIAL WASTE FOR DISPOSITION

    SciTech Connect (OSTI)

    Carter, J.

    2011-01-03

    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.

  14. Theoretical studies of potential energy surfaces

    SciTech Connect (OSTI)

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

    1993-12-01

    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.

  15. Physics Potential of Future Atmospheric Neutrino Searches

    E-Print Network [OSTI]

    Thomas Schwetz

    2008-12-12

    The potential of future high statistics atmospheric neutrino experiments is considered, having in mind currently discussed huge detectors of various technologies (water Cerekov, magnetized iron, liquid Argon). I focus on the possibility to use atmospheric data to determine the octant of $\\theta_{23}$ and the neutrino mass hierarchy. The sensitivity to the $\\theta_{23}$-octant of atmospheric neutrinos is competitive (or even superior) to long-baseline experiments. I discuss the ideal properties of a fictitious atmospheric neutrino detector to determine the neutrino mass hierarchy.

  16. Feynman integral treatment of the Bargmann potential

    SciTech Connect (OSTI)

    Diaf, A.; Chouchaoui, A. . E-mail: akchouchaoui@yahoo.fr; Lombard, R.J.

    2005-06-01

    A method based on path integral formulation is given for obtaining exact solution of the s states for the Bargmann potentialV(r)=1ka{sup 2}{beta}({beta}-1)e{sup -2r/a}1-e{sup -r/a2}-Ae{sup -r/a}1-e{sup -r=} /{sup a},where {beta} and k are parameters. The exact energy spectrum and the normalised s-state eigenfunctions are obtained from the poles of the Green function and their residues, respectively. The results are compared with their of Schrodinger formalism, special cases are also discussed.

  17. Static-light meson-meson potentials

    E-Print Network [OSTI]

    Gunnar Bali; Martin Hetzenegger

    2010-11-02

    We investigate potentials between pairs of static-light mesons in Nf=2 Lattice QCD, in different spin channels. The question of attraction and repulsion is particularly interesting with respect to the X(3872) charmonium state and charged candidates such as the Z+(4430). We employ the nonperturbatively improved Sheikholeslami-Wohlert fermion and the Wilson gauge actions at a lattice spacing a approx. 0.084 fm and a pseudoscalar mass mPS approx. 760 MeV. We use stochastic all-to-all propagator techniques, improved by a hopping parameter expansion. The analysis is based on the variational method, utilizing various source and sink interpolators.

  18. Potential underground risks associated with CAES.

    SciTech Connect (OSTI)

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

    2010-10-01

    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.

  19. FERC sees huge potential for demand response

    SciTech Connect (OSTI)

    2010-04-15

    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.

  20. Fluid properties determine flow line blockage potential

    SciTech Connect (OSTI)

    Hunt, A.

    1996-07-15

    A thorough understanding of fluid properties helps in determining the potential of hydrates, paraffins, or asphaltenes to block subsea flow lines. Thermal, chemical, and mechanical methods are the main ways for preventing deposition. Already in both the North Sea and the Gulf of Mexico, blockages have led to significant losses in production and reserves recovery. This first article in a two-part series discusses thermal and chemical methods in overcoming fluid behavior problems caused by hydrate and other fluid constituents in subsea multiphase flow. The paper discusses subsea production, possible problems, nucleation, growth, deposition, preventing deposition, hydrate predictions, multiphase flow, and hydrate inhibition.

  1. Quantum potential energy as concealed motion

    E-Print Network [OSTI]

    Peter Holland

    2014-11-13

    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.

  2. Ohio Hydropower Potential Inventory Phase I report

    SciTech Connect (OSTI)

    Not Available

    1981-12-01

    The dams researched in the Ohio Department of Natural Resources (ODNR) files were those contained in a list of Ohio dams provided by the ODNR. The result of this file research is a list of 997 dams contained herein that tabulates information on hydraulic head, stream flow, drainage area, and usage. This listing indicated that all but 137 of the 997 dams can be eliminated from consideration for Phase II research. The second phase would be required to further identify which of the 137 dams might have viable hydroelectric potential and define their basic hydroelectric parameters.

  3. 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 Center Home Page on QA:QAsource History ViewMayo,AltFuelVehicle2FlatDemandMonth3 Jump to:PotentialCSPCapacity Jump to: navigation, search

  4. 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 Center Home Page on QA:QAsource History ViewMayo,AltFuelVehicle2FlatDemandMonth3 Jump to:PotentialCSPCapacity Jump to: navigation,

  5. Potential for Data Center Efficiency Improvements

    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 RankADVANCED MANUFACTURINGEnergy Bills andOrder 422.1,anEnergyDepartment ofPotential Health- FEMP Data

  6. Potential for seasonal power oversupply in 2013

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgram Guidelines This document outlines thePotential for Hydrogen/20/2013

  7. Dirac equation exact solutions for generalized asymmetrical Hartmann potentials

    E-Print Network [OSTI]

    Alvaro de Souza Dutra; M. B. Hott

    2007-05-23

    In this work we solve the Dirac equation by constructing the exact bound state solutions for a mixing of vector and scalar generalized Hartmann potentials. This is done provided the vector potential is equal to or minus the scalar potential. The cases of some quasi-exactly solvable and Morse-like potentials are briefly commented.

  8. Potential Land Use Implications of a Global Biofuels Industry

    E-Print Network [OSTI]

    Gurgel, Angelo C.

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

  9. Mechanical Surface Waves Accompany Action Potential Propagation

    E-Print Network [OSTI]

    Ahmed El Hady; Benjamin B. Machta

    2014-10-05

    Many studies have shown that a mechanical displacement of the axonal membrane accompanies the electrical pulse defining the Action Potential (AP). Despite a large and diverse body of experimental evidence, there is no theoretical consensus either for the physical basis of this mechanical wave nor its interdependence with the electrical signal. In this manuscript we present a model for these mechanical displacements as arising from the driving of surface wave modes in which potential energy is stored in elastic properties of the neuronal membrane and cytoskeleton while kinetic energy is carried by the axoplasmic fluid. In our model these surface waves are driven by the traveling wave of electrical depolarization that characterizes the AP, altering the compressive electrostatic forces across the membrane as it passes. This driving leads to co-propagating mechanical displacements, which we term Action Waves (AWs). Our model for these AWs allows us to predict, in terms of elastic constants, axon radius and axoplasmic density and viscosity, the shape of the AW that should accompany any traveling wave of voltage, including the AP predicted by the Hodgkin and Huxley (HH) equations. We show that our model makes predictions that are in agreement with results in experimental systems including the garfish olfactory nerve and the squid giant axon. We expect our model to serve as a framework for understanding the physical origins and possible functional roles of these AWs in neurobiology.

  10. Solitons and vortices in nonlinear potential wells

    E-Print Network [OSTI]

    Dror, Nir

    2015-01-01

    We consider self-trapping of topological modes governed by the one- and two-dimensional (1D and 2D) nonlinear-Schrodinger/Gross-Pitaevskii equation with effective single- and double-well (DW) nonlinear potentials induced by spatial modulation of the local strength of the self-defocusing nonlinearity. This setting, which may be implemented in optics and Bose-Einstein condensates, aims to extend previous studies, which dealt with single-well nonlinear potentials. In the 1D setting, we find several types of symmetric, asymmetric and antisymmetric states, focusing on scenarios of the spontaneous symmetry breaking. The single-well model is extended by including rocking motion of the well, which gives rise to Rabi oscillations between the fundamental and dipole modes. Analysis of the 2D single-well setting gives rise to stable modes in the form of ordinary dipoles, vortex-antivortex dipoles (VADs), and vortex triangles (VTs), which may be considered as produced by spontaneous breaking of the axial symmetry. The con...

  11. Evaluating a Site's Solar Potential May, 2003 When evaluating a site's solar potential, there are several things to consider.

    E-Print Network [OSTI]

    Oregon, University of

    1 Evaluating a Site's Solar Potential May, 2003 When evaluating a site's solar potential the potential locations for the solar electric system have been identified, it is important to optimize to the street. 3. Next, stand in the middle of the potential location for the array. a. Use a Solar Path Finder

  12. Dual condensates at finite isospin chemical potential

    E-Print Network [OSTI]

    Zhang, Zhao

    2015-01-01

    The dual observables as order parameters for center symmetry are tested at finite isospin chemical potential $\\mu_I$ in a Polyakov-loop enhanced chiral model of QCD with physical quark masses. As a counterpart of the dressed Polyakov-loop, the first Fourier moment of pion condensate is introduced for $\\mu_I>{m_\\pi}/{2}$ under the temporal twisted boundary conditions for quarks. We demonstrate that this dual condensate exhibits the similar temperature dependence as the conventional Polyakov-loop. We confirm that its rapid increase with $T$ is driven by the evaporating of pion condensation. On the other hand, the dressed Polyakov-loop shows abnormal thermal behavior, which even decreases with $T$ at low temperatures due to the influence of pion condensate. We thus argue that in QCD the critical temperature extracting from a dual observable may have nothing to do with the quark confinement-deconfinement transition if the quark mass is very small.

  13. Dual condensates at finite isospin chemical potential

    E-Print Network [OSTI]

    Zhao Zhang; Qing Miao

    2015-07-26

    The dual observables as order parameters for center symmetry are tested at finite isospin chemical potential $\\mu_I$ in a Polyakov-loop enhanced chiral model of QCD with physical quark masses. As a counterpart of the dressed Polyakov-loop, the first Fourier moment of pion condensate is introduced for $\\mu_I>{m_\\pi}/{2}$ under the temporal twisted boundary conditions for quarks. We demonstrate that this dual condensate exhibits the similar temperature dependence as the conventional Polyakov-loop. We confirm that its rapid increase with $T$ is driven by the evaporating of pion condensation. On the other hand, the dressed Polyakov-loop shows abnormal thermal behavior, which even decreases with $T$ at low temperatures due to the influence of pion condensate. We thus argue that in QCD the critical temperature extracting from a dual observable may have nothing to do with the quark confinement-deconfinement transition if the quark mass is very small.

  14. Cogeneration development and market potential in China

    SciTech Connect (OSTI)

    Yang, F.; Levine, M.D.; Naeb, J.; Xin, D.

    1996-05-01

    China`s energy production is largely dependent on coal. China currently ranks third in global CO{sub 2} emissions, and rapid economic expansion is expected to raise emission levels even further in the coming decades. Cogeneration provides a cost-effective way of both utilizing limited energy resources and minimizing the environmental impacts from use of fossil fuels. However, in the last 10 years state investments for cogeneration projects in China have dropped by a factor of 4. This has prompted this study. Along with this in-depth analysis of China`s cogeneration policies and investment allocation is the speculation that advanced US technology and capital can assist in the continued growth of the cogeneration industry. This study provides the most current information available on cogeneration development and market potential in China.

  15. Quantum Walk Search through Potential Barriers

    E-Print Network [OSTI]

    Thomas G. Wong

    2015-09-24

    A randomly walking quantum particle searches for a marked vertex on the complete graph of $N$ vertices in Grover's $\\Theta(\\sqrt{N})$ steps, which is quadratically faster than a classical random walk's $\\Theta(N)$ steps. The basis of this speedup and the success of other quantum walk algorithms is often attributed to the quantum walk's ballistic propagation, which is quadratically faster than a classical random walk's diffusion. We show that this faster propagation is not the whole story, however. If sufficiently strong potential barriers hinder the quantum walk, it can lose its quantum speedup despite retaining ballistic dispersion. Thus ballistic spreading alone does not yield fast quantum walk algorithms. Closer inspection reveals that quantum walks search quickly by applying just the right phases for amplitude amplification to succeed.

  16. Self-potential observations during hydraulic fracturing

    SciTech Connect (OSTI)

    Moore, Jeffrey R.; Glaser, Steven D.

    2007-09-13

    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.

  17. Scalar potential model of the Pioneer Anomaly

    E-Print Network [OSTI]

    John C. Hodge

    2007-01-20

    The unexplained sunward acceleration $a_\\mathrm{P}$ of the Pioneer 10 (P10) and the Pioneer 11 (P11) spacecraft remains a mystery. A scalar potential model (SPM) that derived from considerations of galaxy clusters, of redshift, and of H{\\scriptsize{I}} rotation curves of spiral galaxies is applied to the Pioneer Anomaly. Matter is posited to warp the scalar potential $\\rho$ field. The changing $\\rho$ field along the light path causes the Pioneer Anomaly. The SPM is consistent with the general value of $a_\\mathrm{P}$; with the annual periodicity; with the differing $a_\\mathrm{P}$ between the spacecraft; with the discrepancy between {\\textit{Sigma}} and CHASMP programs at P10 (I) and their closer agreement at P10 (III); with the slowly declining $a_\\mathrm{P}$; with the low value of $a_\\mathrm{P}$ immediately before the P11's Saturn encounter; with the high uncertainty in the value of $a_\\mathrm{P}$ obtained during and after the P11's Saturn encounter; and with the cosmological connection suggested by $a_\\mathrm{P} \\approx cH_\\mathrm{o}$. The effect of the $\\rho$ field warp appears as the curvature of space proposed by general relativity (GR). The Hubble Law and $a_\\mathrm{P} \\approx cH_\\mathrm{o}$ are manifestations of the Newtonian spherical property. Therefore, gravitational attraction, the equivalence principle, and the planet ephemeris remain as described by GR. GR corresponds to the SPM in the limit in which the Sources and Sinks may be replaced by a flat and static $\\rho$ field such as between cluster cells and on the Solar System scale at a relatively large distance from a Source or Sink.

  18. Interior cavern conditions and salt fall potential

    SciTech Connect (OSTI)

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

    1998-03-01

    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.

  19. A map for eccentric orbits in triaxial potentials

    E-Print Network [OSTI]

    J. Touma; S. Tremaine

    1997-06-04

    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.

  20. Potential of Securitization in Solar PV Finance

    SciTech Connect (OSTI)

    Lowder, T.; Mendelsohn, M.

    2013-12-01

    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.

  1. The local potential approximation in quantum gravity

    E-Print Network [OSTI]

    Dario Benedetti; Francesco Caravelli

    2012-10-09

    Within the context of the functional renormalization group flow of gravity, we suggest that a generic f(R) ansatz (i.e. not truncated to any specific form, polynomial or not) for the effective action plays a role analogous to the local potential approximation (LPA) in scalar field theory. In the same spirit of the LPA, we derive and study an ordinary differential equation for f(R) to be satisfied by a fixed point of the renormalization group flow. As a first step in trying to assess the existence of global solutions (i.e. true fixed point) for such equation, we investigate here the properties of its solutions by a comparison of various series expansions and numerical integrations. In particular, we study the analyticity conditions required because of the presence of fixed singularities in the equation, and we develop an expansion of the solutions for large R up to order N=29. Studying the convergence of the fixed points of the truncated solutions with respect to N, we find a characteristic pattern for the location of the fixed points in the complex plane, with one point stemming out for its stability. Finally, we establish that if a non-Gaussian fixed point exists within the full f(R) approximation, it corresponds to an R^2 theory.

  2. Obama Officials Announce Steps to Promote the Clean Energy Potential...

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

    Obama Officials Announce Steps to Promote the Clean Energy Potential of the West Obama Officials Announce Steps to Promote the Clean Energy Potential of the West June 15, 2009 -...

  3. Reception of longitudinal vector potential radiation with a plasma antenna

    SciTech Connect (OSTI)

    Zimmerman, Robert K. Jr.

    2013-07-28

    To help resolve the long-running debate between physicists and engineers regarding the existence of the magnetic vector potential, herewith we describe an experiment demonstrating reception of time-harmonic vector potential radiation at 1.3 GHz.

  4. Development of the Potential Energy Savings Estimation (PESE) Toolkit 

    E-Print Network [OSTI]

    Liu, J.; Baltazar, J. C.; Claridge, D. E.

    2010-01-01

    This study has developed a prototype computer tool called the Potential Energy Savings Estimation (PESE) Toolkit. Baltazar’s methodology for potential energy savings estimation from EBCx/retrofit measures has been improved ...

  5. Potential for radionuclide redistribution due to biotic intrusion...

    Office of Scientific and Technical Information (OSTI)

    potentially lead to the exposure to members of the public. The potential amount of contamination deposited on the ground surface, due to plant intrusion into buried waste, is a...

  6. Factorization method and new potentials from the inverted oscillator

    SciTech Connect (OSTI)

    Bermudez, David Fernández C, David J.

    2013-06-15

    In this article we will apply the first- and second-order supersymmetric quantum mechanics to obtain new exactly-solvable real potentials departing from the inverted oscillator potential. This system has some special properties; in particular, only very specific second-order transformations produce non-singular real potentials. It will be shown that these transformations turn out to be the so-called complex ones. Moreover, we will study the factorization method applied to the inverted oscillator and the algebraic structure of the new Hamiltonians. -- Highlights: •We apply supersymmetric quantum mechanics to the inverted oscillator potential. •The complex second-order transformations allow us to build new non-singular potentials. •The algebraic structure of the initial and final potentials is analyzed. •The initial potential is described by a complex-deformed Heisenberg–Weyl algebra. •The final potentials are described by polynomial Heisenberg algebras.

  7. Potential Federal On-Site Solar Aggregation in Washington, D...

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

    Potential Federal On-Site Solar Aggregation in Washington, D.C., and Maryland Potential Federal On-Site Solar Aggregation in Washington, D.C., and Maryland Presentation describes...

  8. Renormalization of the Brazilian chiral nucleon-nucleon potential

    SciTech Connect (OSTI)

    Da Rocha, Carlos A.; Timoteo, Varese S.

    2013-03-25

    In this work we present a renormalization of the Brazilian nucleon-nucleon (NN) potential using a subtractive method. We show that the exchange of correlated two pion is important for isovector channels, mainly in tensor and central potentials.

  9. New Report Shows Domestic Offshore Wind Industry Potential, 21...

    Office of Environmental Management (EM)

    Report Shows Domestic Offshore Wind Industry Potential, 21 Projects Planned in U.S. Waters New Report Shows Domestic Offshore Wind Industry Potential, 21 Projects Planned in U.S....

  10. Energy Department Releases Report, Evaluates Potential for Wind...

    Office of Environmental Management (EM)

    Releases Report, Evaluates Potential for Wind Power in All 50 States Energy Department Releases Report, Evaluates Potential for Wind Power in All 50 States May 19, 2015 - 11:38am...

  11. A Potential Path to Emissions-Free Fossil Energy | Department...

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

    A Potential Path to Emissions-Free Fossil Energy A Potential Path to Emissions-Free Fossil Energy August 20, 2013 - 10:00am Addthis The National Energy Technology Laboratory's...

  12. Scattering amplitudes for multi-indexed extensions of solvable potentials

    SciTech Connect (OSTI)

    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)

    2014-04-15

    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.  Pöschl–Teller 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.

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

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

    map shows wind potential capacity for turbine hub heights at 140 meters. This map shows wind potential capacity for turbine hub heights at 140 meters. Brie Van Cleve Stakeholder...

  14. Potential Flow Calculations of Axisymmetric Ducted Wind Turbines

    E-Print Network [OSTI]

    Widnall, Sheila

    2009-09-02

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

  15. CHP Market Potential in the Western States, September 2005

    Broader source: Energy.gov [DOE]

    Outlook for CHP in each state based on base case cumulative market penetration to the technical market potential calculated

  16. 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

  17. Elec 331 -Bio-Potential Electrodes Review Definitions

    E-Print Network [OSTI]

    Pulfrey, David L.

    Elec 331 - Bio-Potential Electrodes 1 Review Definitions · Ion Charged particle (molecule / atom - Bio-Potential Electrodes 2 Polarizable Electrodes · No chemical reaction / electron / ion exchange minimizes motion artifact · Pull hard to remove #12;Elec 331 - Bio-Potential Electrodes 3 Non

  18. Regional Assessment of Tsunami Potential in the Gulf of Mexico

    E-Print Network [OSTI]

    ten Brink, Uri S.

    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

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

    E-Print Network [OSTI]

    E. Smith; R. Woodhouse; Z. Papp

    2012-09-04

    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.

  20. Resuspension potential of surficial sediments in Saguenay Fjord (Quebec, Canada)

    E-Print Network [OSTI]

    Long, Bernard

    Resuspension potential of surficial sediments in Saguenay Fjord (Que´bec, Canada) Ann-Laure Moreau Fjord. Because this turbidite covered contaminated sediments, the resuspension potential of surficial. The resuspension potential of surficial sediments in Saguenay Fjord was investigated in situ over a 3- yr period

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

    E-Print Network [OSTI]

    some kinetic energy as well as some potential energy change along the way. Question: What doespage - 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

  2. Potential Flow Modelling for Wind Turbines Shane Cline

    E-Print Network [OSTI]

    Victoria, University of

    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

  3. A BOLTZMANN MODEL FOR TRAPPED PARTICLES IN A SURFACE POTENTIAL

    E-Print Network [OSTI]

    Vignal, Marie-Hélène

    A BOLTZMANN MODEL FOR TRAPPED PARTICLES IN A SURFACE POTENTIAL PIERRE DEGOND, C´ELINE PARZANI particles in a surface potential. The potential confines particles close to the surface increasing the charged particle model with some numerical simulations of a gas discharge on a satellite solar array. We

  4. FEL potential of eRHIC

    SciTech Connect (OSTI)

    Litvinenko, V.N.; Ben-Zvi, I.; Hao, Y.; Kao, C-C.; Kayran, D.; Murphy, J.B.; Ptitsyn, V.; Trbojevic, D.; Tsoupas, N.

    2010-08-23

    Brookhaven National Laboratory plans to build a 5-to-30 GeV energy-recovery linac (ERL) for its future electron-ion collider, eRHIC. In past few months, the Laboratory turned its attention to the potential of this unique machine for free electron lasers (FELS), which we initially assessed earlier. In this paper, we present our current vision of a possible FEL farm, and of narrow-band FEL-oscillators driven by this accelerator. eRHIC, the proposed electron-ion collider at BNL, takes advantage of the existing Relativistic Heavy Ion Collider (RHIC) complex. Plans call for adding a six-pass super-conducting (SRF) ERL to this complex to collide polarized- and unpolarized- electron beams with heavy ions (with energies up to 130 GeV per nucleon) and with polarized protons (with energies up to 325 GeV). RHIC, with a circumference of 3.834 km, has three-fold symmetry and six straight sections each {approx} 250 m long. Two of these straight sections will accommodate 703-MHz SRF linacs. The maximum energy of the electron beam in eRHIC will be reached in stages, from 5 GeV to 30 GeV, by increasing the lengths of its SRF linacs. We plan to install at the start the six-pass magnetic system with small gap magnets. The structure of the eRHIC's electron beam will be identical with that of its hadron beam, viz., 166 bunches will be filled, reserving about a one-microsecond gap for the abort kicker. With modest modifications, we can assure that eRHIC's ERL will become an excellent driver for continuous wave (CW) FELs (see Fig.1). The eRHIC's beam structure will support the operation of several such FELs in parasitic mode.

  5. Miscibility, solubility and retrograde prediction of methane in liquids. Liquid storage of natural gas (LSNG) for vehicle fuel. Annual report, July 15, 1992-July 15, 1993

    SciTech Connect (OSTI)

    Mansoori, G.A.

    1994-07-01

    The primary focus of this project is to investigate the concept of liquid storage of natural gas (LSNG) for potential natural gas vehicle (NGV) application. The research work consists of developing accurate techniques for modeling of interfacial properties, miscibility and solubility of methane in liquids. By implementing this project it will be possible: To use natural gas as the fuel for internal combustion engines; To increase the gas tank capacity about 200% more over the compressed natural gas (CNG) scheme; To increase the octane-number of low quality liquid fuels through blending them with natural gas.

  6. Refueling stations for natural gas vehicles

    SciTech Connect (OSTI)

    Blazek, C.F.; Kinast, J.A.; Biederman, R.T.; Jasionowski, W.

    1991-01-01

    The unavailability of natural gas vehicle (NGV) refueling stations constitutes one of the major barriers to the wide spread utilization of natural gas in the transportation market. The purpose of this paper is to review and evaluate the current technical and economic status of compressed natural gas vehicle refueling stations and to identify the components or design features that offer the greatest potential for performance improvements and/or cost reductions. Both fast-fill- and slow-fill-type refueling systems will be discussed. 4 refs., 10 figs., 6 tabs.

  7. The Potential Impact of Increased Renewable Energy Penetrations on Electricity Bill Savings from Residential Photovoltaic Systems

    E-Print Network [OSTI]

    Barbose, Galen

    2013-01-01

    ABORATORY The Potential Impact of Increased Renewable Energyemployer. THE POTENTIAL IMPACT OF INCREASED RENEWABLE ENERGY

  8. Fusion at deep subbarrier energies: potential inversion revisited

    E-Print Network [OSTI]

    K. Hagino; N. Rowley

    2008-11-15

    For a single potential barrier, the barrier penetrability can be inverted based on the WKB approximation to yield the barrier thickness. We apply this method to heavy-ion fusion reactions at energies well below the Coulomb barrier and directly determine the inter-nucleus potential between the colliding nuclei. To this end, we assume that fusion cross sections at deep subbarrier energies are governed by the lowest barrier in the barrier distribution. The inverted inter-nucleus potentials for the $^{16}$O +$^{144}$Sm and $^{16}$O +$^{208}$Pb reactions show that they are much thicker than phenomenological potentials. We discuss a consequence of such thick potential by fitting the inverted potentials with the Bass function.

  9. Reassessing Wind Potential Estimates for India: Economic and Policy Implications

    SciTech Connect (OSTI)

    Phadke, Amol; Bharvirkar, Ranjit; Khangura, Jagmeet

    2011-09-15

    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.

  10. Thermodynamics of QCD at large quark chemical potential

    E-Print Network [OSTI]

    Andreas Gerhold; Andreas Ipp; Anton Rebhan

    2005-12-21

    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.

  11. Working Fluids Low Global Warming Potential Refrigerants | Department...

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

    Refrigerants Working Fluids Low Global Warming Potential Refrigerants Brian Fricke conducts research in ORNL's Building Technologies Research & Integration Center. Brian Fricke...

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

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

    Refrigerants - 2013 Peer Review Working Fluids Low Global Warming Potential Refrigerants - 2013 Peer Review Emerging Technologies Project for the 2013 Building Technologies...

  13. Realization of Algae Potential Algae Biomass Yield Program

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

    Realization of Algae Potential Algae Biomass Yield Program March 25, 2015 Technology Area Review Peter Lammers, P.I. New Mexico State University -> Arizona State University This...

  14. 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...

  15. Physics Potential of the gamma=100,100 Beta Beam

    E-Print Network [OSTI]

    M. Mezzetto

    2005-11-02

    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.

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

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

    Potential Oil Production from the Coastal Plain of the Arctic National Wildlife Refuge: Updated Assessment Glossary ANILCA: Alaska National Interest Lands Conservation Act ANS:...

  17. Potential Global Benefits of Improved Ceiling Fan Energy Efficiency

    E-Print Network [OSTI]

    Sathaye, Nakul

    2014-01-01

    using genetic algorithm. Energy for Sustainable Development,induced by a room ceiling- fan. Energy and Buildings, 43(8),G. , 2010. Estimating Technical Energy Saving Potential from

  18. ARM Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) Product

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

    Jensen, Michael

    2014-04-10

    ARM soundings are used to determine Convective Available Potential Energy (CAPE), Convective Inhibition (CIN) and associated properties, using the following relationships;

  19. Meeting Concerning Potential Test Procedures and Energy Conservation...

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

    provides a summary of a March 7, 2012, meeting with DOE officials concerning potential test procedures and energy conservation standards for set-top boxes and network equipment....

  20. Shared Solar: Current Landscape, Market Potential, and the Impact...

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

    SHARED SOLAR: CURRENT LANDSCAPE, MARKET POTENTIAL, AND THE IMPACT OF FEDERAL SECURITIES REGULATION Research Highlights In a recent report, NREL concluded that approximately 49% of...