WorldCat Identities

United States Department of Energy Oak Ridge Operations

Overview
Works: 2,026 works in 2,212 publications in 1 language and 6,466 library holdings
Roles: Researcher
Publication Timeline
Key
Publications about United States Publications about United States
Publications by United States Publications by United States
Most widely held works by United States
Development of Technologies for a High Efficiency, Very Low Emission, Diesel Engine for Light Trucks and Sport Utility Vehicles ( )
2 editions published between 1997 and 2005 in English and held by 9 WorldCat member libraries worldwide
Cummins Inc., in partnership with the Department of Energy, has developed technology for a new highly efficient, very low emission, diesel engine for light trucks and sport utility vehicles. This work began in April 1997, and started with very aggressive goals for vehicles in the 5751 to 8500 pound GCW weight class. The primary program goals were as follows: (1) EMISSIONS -- NOx = 0.50 g/mi; PM = 0.05 g/mi; CO = 2.8 g/mi; and NMHC = 0.07 g/mi. California decided to issue new and even tougher LEV II light truck regulations late in 1999. EPA also issued its lower Tier 2 regulations late in 2000. The net result was that the targets for this diesel engine project were lowered, and these goals were eventually modified by the publication of Federal Tier 2 emission standards early in 2000 to the following: NOx = 0.07 g/mi; and PM = 0.01 g/mi. (2) FUEL ECONOMY -- The fuel economy goal was 50 percent MPG improvement (combined city/highway) over the 1997 gasoline powered light truck or sport utility vehicle in the vehicle class for which this diesel engine is being designed to replace. The goal for fuel economy remained at 50 percent MPG improvement, even with the emissions goal revisions. (3) COOPERATIVE DEVELOPMENT -- Regular design reviews of the engine program will be conducted with a vehicle manufacturer to insure that the concepts and design specifics are commercially feasible. (DaimlerChrysler has provided Cummins with this design review input.) Cummins has essentially completed a demonstration of proof-of-principle for a diesel engine platform using advanced combustion and fuel system technologies. Cummins reported very early progress in this project, evidence that new diesel engine technology had been developed that demonstrated the feasibility of the above emissions goals. Emissions levels of NOx = 0.4 g/mi and PM = 0.06 g/mi were demonstrated for a 5250 lb. test weight vehicle with passive aftertreatment only. These results were achieved using the full chassis dynamometer FTP-75 test procedure that allowed compliance with the Tier 2 Interim Bin 10 Standards and would apply to vehicles in MY2004 through MY2007 timeframe. In further technology development with active aftertreatment management, Cummins has been able to report that the emissions goals for the Tier 2 Bin 5 standards were met on an engine running the full FTP-75 test procedure. The fuel economy on the chassis tests was measured at over 59 percent MPG improvement over the gasoline engines that are offered in typical SUVs and light trucks. The above demonstration used only in-cylinder fueling for management of the aftertreatment system
Northeast Regional Biomass Energy Program ( )
2 editions published in 1992 in English and held by 8 WorldCat member libraries worldwide
The Northeast Regional Biomass Program (NRBP) is entering its ninth year of operation. The management and the objectives have virtually remained unchanged and are stated as follows. The program conducted by NRBP has three basic features: (1) a state grant component that provides funds (with a 50 percent matching requirement) to each of the states in the region to strengthen and integrate the work of state agencies involved in biomass energy; (2) a series of technical reports and studies in areas that have been identified as being of critical importance to the development of biomass energy in the region; and (3) a continuous long range planning component with heavy private sector involvement that helps to identify activities necessary to spur greater development and use of biomass energy in the Northeast
Decoherence and recoherence of beam in phase space ( )
2 editions published in 1993 in English and held by 8 WorldCat member libraries worldwide
By use of the particle distribution in phase space, a new approach is introduced to study the decoherence and recoherence of a kicked beam when betatron tunes are far from any resonance. With this method, the decoherence and the recoherence of a beam can be analyzed easily in both 2-dimensional and 4-dimensional cases with any form of the tune spread. The decoherence of a beam initially trapped in a resonance island was also studied. Due to the tune modulation, the separatrix of island develops a chaotic layer and particles within the island can drift out of the island along the layer. Consequently, the beam decoheres gradually. The rate of decoherence is shown to be proportional to the modulation amplitude. As a function of the modulation frequency, it reaches a peak near the tune of trapped particles before decreasing to zero
A program in medium-energy nuclear physics. Progress report, September 1, 1992--June 30, 1993 ( )
2 editions published between 1993 and 1998 in English and held by 8 WorldCat member libraries worldwide
This report reviews progress on our nuclear-physics program for the last ten months, and includes as well copies of our publications and other reports for that time period. The structure of this report follows that of our 1992 Progress Report: Sec. II outlines our research activities aimed at future experiments at CEBAF, NIKHEF, and Bates; Sec. III gives results of our recent research activities at NIKHEF, LAMPF, and elsewhere; Sec. IV provides an update of our laboratory activities at GWU, including those at our new Nuclear Detector Laboratory at our Virginia Campus; and Sec. V is a list of our publications, proposals, and other reports. Copies of those on medium-energy nuclear physics are reproduced in the Appendix. The highlight of the year has been the approval by the NIKHEF and CEBAF PACs of all three of the proposals we have submitted. These are {open_quotes}Recoil Polarization of the Neutron in the Reactions ³He(e, e(prime)) and ⁴He(e, e(prime)n), {close_quotes} NIKHEF Proposal 93-09 {open_quotes}Photoreactions on ³He, {close_quotes} CEBAF Proposal 93-044, and {open_quotes}Photoabsorption and Photofission of Nuclei, {close_quotes} CEBAF Proposal 93-019. The NIKHEF experiment involves the use of the High-Acceptance Recoil Polarimeter (HARP) for detection and measurement of the polarization of the emitted neutron. We, together with our colleagues at Grenoble, are responsible for the design and construction of the wire chambers for this device; we have largely completed the design phase this part year. The CEBAF experiments involve the use of the Hall-B Photon Tagger for production of the monochromatic photon beam. We are responsible for the 432-scintillator focal-plane detector array for this device; again, most of the design work and some prototype testing have been completed this past year
Linear stability of stationary solutions of the Vlasov-Poisson system in three dimensions ( )
2 editions published in 1993 in English and held by 8 WorldCat member libraries worldwide
Rigorous results on the stability of stationary solutions of the Vlasov-Poisson system are obtained in both the plasma physics and stellar dynamics contexts. It is proven that stationary solutions in the plasma physics (stellar dynamics) case are linearly stable if they are decreasing (increasing) functions of the local, i.e. particle, energy. The main tool in the analysis is the free energy of the system, a conserved quantity. In addition, an appropriate global existence result is proven for the linearized Vlasov-Poisson system and the existence of stationary solutions that satisfy the above stability condition is established
Modeling Single Molecule Fluorescence and Lasing. Final report ( )
2 editions published between 1998 and 1999 in English and held by 8 WorldCat member libraries worldwide
In FY 1998 our efforts were in three main areas, all related to detecting single fluorescent molecules [1] and understanding their emission. (1) We completed the calculations and analysis for a paper on spatial photoselection of single molecules on the surface of a dielectric microsphere. [2] Molecules that are oriented parallel to the surface of a spherical microcavity have position-dependent excitation probabilities and a collection efficiencies. The results are different for different polarizations. (2) We completed the modeling and analysis for a paper analyzing single molecule photocount statistics in microdroplets. [3] In this paper we employed a Monte Carlo technique to simulate effects of molecular occupancy, photobleaching, and fluorophor spatial diffusion within the droplet. We discussed the optimization of detection of single molecules in microdroplets. (3) We modeled the images of single molecules in microdroplets and submitted a preliminary report of these images in a paper which also showed experimental results. [4] The computed images depend upon the molecule's position within the microsphere, its orientation and emission frequency, and on the size and refractive index of the microsphere. For this work we used and modified models and computer codes developed previously, [5] as well as developed new models and codes
A program in medium-energy nuclear physics. Progress report, August 1, 1991--August 31, 1992 ( )
2 editions published between 1992 and 1998 in English and held by 8 WorldCat member libraries worldwide
This report reviews progress on our nuclear-physics program for the last year, and includes as well copies of our publications and other reports for that time period. The structure of this report follows that of our 1991 Renewal Proposal and Progress Report: Sec. II outlines our research activities aimed at future experiments at CEBAF, NIKHEF, and Bates; Sec. III gives results of our recent research activities at NIKHEF, LAMPF, and elsewhere; Sec. IV provides an update of our laboratory activities at GWU, including the acquisition of our new Nuclear Detector Laboratory at our new Virginia Campus; and Sec. V is a list of our publications, proposals, and other reports. copies of those on medium-energy nuclear physics are reproduced in the Appendix
Continued development of modeling tools and theory for RF heating ( )
2 editions published in 1998 in English and held by 8 WorldCat member libraries worldwide
The work performed during the grant has been reported long before this date, specifically in: (1) the grant's annual performance report for 1991, MRC/WDC-R-277; (2) the published AIP Conference Proceedings {number_sign}244, Radio Frequency Power in Plasmas, Charleston, SC 1991, ''Evaluation of Wave Dispersion, Mode-Conversion, and Damping for ECRH with Exact Relativistic Corrections, '' by D.N. Smithe and P.L. Colestock; and (3) an unpublished paper entitled ''Temperature Anisotropy and Rotation Upgrades to the ICRF Modules in SNAP and TRANSP'', presented at the 1992 ICRF Modeling and Theory Workshop, at the Princeton Plasma Physics Laboratory. This final report contains copies of number (1). The specifics of the grant's final months' activities, which to the authors recollection have never been reported to the DOE, are as follows. The original grant, which was to terminate August 15, 1991, was extended without additional funds to October 31, 1992. The primary reason for the extension was to permit attendance at the 1992 ICRF Modeling and Theory Workshop at the Princeton Plasma Physics Laboratory (PPPL), which was finally held August 17--18, 1992, after having been rescheduled several times during the summer of 1992. The body of this report contains copies of the 1991 annual report, which gives detailed discussion of the work accomplished
Test of the transport properties of a helical electrostatic quadrupole and quasi-octupole ( )
2 editions published in 1993 in English and held by 8 WorldCat member libraries worldwide
A third-generation continuous helical electrostatic quadrupole (HESQ) lens has been built and tested. The new HESQ is 21.5 cm long and has a 3.6 cm diameter aperture. The HESQ has been tested under two separate conditions: with a pulsed 25 keV, 0.5 mA proton beam; and a 25 keV, 10 mA proton beam. The input emittance was fixed using a multi-aperture collimator. A comparison is made between experiment and numerical simulations for a wide variety of operating conditions. A second possible operating mode is the quasi-octupole mode, which offers significantly reduced aberration when compared to the quadrupole mode. The results of preliminary tests in this operating mode will be presented
Superstring phenomenology present-and-future perspective ( )
2 editions published in 1997 in English and held by 8 WorldCat member libraries worldwide
The objective of superstring phenomenology is to develop the models and methodology needed to connect quantitatively between Planck scale and electroweak scale experimental data. I review the present status of this endeavor with a focus on the three generation free fermionic models
Radiation-induced micrencephaly in guinea pigs ( )
3 editions published between 1991 and 1992 in English and held by 6 WorldCat member libraries worldwide
The effect of x rays on brain weight of guinea pig pups at birth was studied for 21-day old embroys exposed in utero to doses of 75 and 100 mGy. When compared to controls and when corrected for body weight, gestation time, litter size, sex, and examiner differences the brains of irradiated pups weighed approximately 46 mg less than those of controls (p<0.001) for the 75-mGy group and about 55 mg less for the 100-mGy group. Brains of females weighed 51 mg less than those of males of the same body weight. Dam weight and caging conditions had no observed effect on brain weight
Magnetic reconnection at stressed x-type neutral points ( )
2 editions published in 1992 in English and held by 5 WorldCat member libraries worldwide
The reconnection and relaxation of two-dimensional stressed (non-potential) x-type neutral point magnetic fields are studied via solution of the nonlinear resistive 2-D MHD equations and by analytical solution of the linear eigenvalue problem. The linear dispersion relation was generalized for azimuthally nonsymmetric perturbations, and have found that for modes with azimuthal mode numbers m> 0, the relaxation can occur at a rate faster than that for n = m = 0, where n is the radial ''quantum'' number. One finds that for nearly azimuthally symmetric magnetic perturbations that are zero at the boundary; i.e. the ''frozen-in'' (sometimes called ''fine-tied'') boundary conditions, the fields relax incompressibly and nonlinearly to the unstressed x-type neutral point at a rate close to that predicted by linear theory. Also, fully compressible nonlinear MHD simulations have been performed, which show that the interaction between the plasma flow velocity and the magnetic field is the important physical effect, while the inclusion of thermodynamics does not affect the evolution considerably. A Lyapunov functional for the nonlinear incompressible 2-D resistive MHD equations is derived to show that the current-free x-point configuration is a global equilibrium to which general initial conditions relax
Self shielding of surfaces irradiated by intense energy fluxes. Final report ( )
2 editions published in 1991 in English and held by 5 WorldCat member libraries worldwide
This dissertation will outline a direct methods of temperature, density, composition, and velocity measurement which should be widely applicable to railgun systems. The measurements demonstrated here should prove usefull basis for further studies of plasma/target interaction
Kinetics and mechanisms of key elementary processes of importance to high temperature combustion chemistry. [Final report, June 1, 1985--August 31, 1989] ( )
2 editions published in 1989 in English and held by 5 WorldCat member libraries worldwide
We have investigated the kinetics and mechanisms numerous reactions involving many key reactive combustion species: CH₂O, CH₃O, CH, NO, NO₂, CH₃OH, C₂H₅OH, i-C₃H--OH, t-C₄H₉OH, C₆H₅, C₅O and C₆H₅O and C₆H₆, among others. A total of 24 reactive systems have been studied
Committee on Atomic, Molecular, and Optical Sciences (CAMOS). Technical progress report, [February 1, 1991--January 31, 1992] ( )
2 editions published in 1992 in English and held by 5 WorldCat member libraries worldwide
The Committee on Atomic, Molecular, and Optical Sciences is a standing committee under the auspices of the Board on Physics and Astronomy, Commission on Physical Sciences, Mathematics, and Applications of the National Academy of Sciences -- National Research Council. The atomic, molecular, and optical (AMO) sciences represent a broad and diverse field in which much of the research is carried out by small groups. These groups generally have not operated in concert with each other and, prior to the establishment of CAMOS, there was no single committee or organization that accepted the responsibility of monitoring the continuing development and assessing the general public health of the field as a whole. CAMOS has accepted this responsibility and currently provides a focus for the AMO community that is unique and essential. The membership of CAMOS is drawn from research laboratories in universities, industry, and government. Areas of expertise on the committee include atomic physics, molecular science, and optics. A special effort has been made to include a balanced representation from the three subfields. (A roster is attached.) CAMOS has conducted a number of studies related to the health of atomic and molecular science and is well prepared to response to requests for studies on specific issues. This report brief reviews the committee work of progress
Nuclear structure from radioactive decay. Annual progress report ( )
2 editions published in 1992 in English and held by 5 WorldCat member libraries worldwide
The most important aspect of the wind-up of UNISOR-based research is completion of student theses. Analysis is proceeding on extensive studies in the neutron-deficient rare earth isotopes with N <82 and the neutron-deficient region below Z = 82. These studies address the onset of deformation in the N <82, Z> 50 open shell region and shape coexistence in the N (approximately) 104, Z (less-than or equal to) 82 region, respectively. The main ongoing topics are shape coexistence in nuclei and the microscopic structure of collective motion in nuclei from a phenomenological point of view. New topics this year focus on the structure of nuclei near the N = Z line. Two topics have been chosen for detailed study: shape coexistence and electric monopole transition strengths
Fermilab E791 ( )
2 editions published in 1992 in English and held by 5 WorldCat member libraries worldwide
Fermilab E791, a very high statistics charm particle experiment, recently completed its data taking at Fermilab's Tagged Photon Laboratory. Over 20 billionevents were recorded through a loose transverse energy trigger and written to 8mm tape in the 1991--92 fixed target run at Fermilab. This unprecedented data sample containing charm is being analysis on many-thousand MIP RISC computing farms set up at sites in the collaboration. A glimpse of the data taking and analysis effort is presented. We also show some preliminary results for common charm decay modes. Our present analysis indicates a very rich yield of over 200K reconstructed charm decays
A quenched c 1 critical matrix model ( )
2 editions published in 1990 in English and held by 5 WorldCat member libraries worldwide
We study a variant of the Penner-Distler-Vafa model, proposed as a c = 1 quantum gravity: 'quenched' matrix model with logarithmic potential. The model is exactly soluble, and exhibits a two-cut branching as observed in multicritical unitary matrix models and multicut Hermitian matrix models. Using analytic continuation of the power in the conventional polynomial potential, we also show that both the Penner-Distler-Vafa model and our 'quenched' matrix model satisfy Virasoro algebra constraints
Activity composition relationships in silicate melts. Final report ( )
2 editions published in 1990 in English and held by 5 WorldCat member libraries worldwide
Equipment progress include furnace construction and electron microprobe installation. The following studies are underway: phase equilibria along basalt-rhyolite mixing line (olivine crystallization from natural silicic andensites, distribution of Fe and Mg between olivine and liquid, dist. of Ca and Na between plagioclase and liquid), enthalpy-composition relations in magmas (bulk heat capacity of alkali basalt), density model for magma ascent and contamination, thermobarometry in igneous systems (olivine/plagioclase phenocryst growth in Quat. basalt), high-pressure phase equilibria of alkali basalt, basalt-quartz mixing experiments, phase equilibria of East African basalts, and granitic minerals in mafic magma. (DLC)
Some simple criteria for gauged R-parity ( )
2 editions published in 1992 in English and held by 5 WorldCat member libraries worldwide
Some simple conditions which are sufficient to guarantee that R- parity survives as an unbroken gauged discrete subgroup of the continuous gauge symmetry in certain supersymmetric extensions of the standard model are presented
 
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