WorldCat Identities

United States Department of Energy Oak Ridge Operations

Works: 1,920 works in 2,213 publications in 1 language and 8,651 library holdings
Roles: Researcher
Classifications: LD6016,
Publication Timeline
Most widely held works by United States
Mechanical properties and modeling of seal-forming lithologies. Technical progress report No. 2, March 15, 1991--March 14, 1992( )

4 editions published between 1992 and 1993 in English and held by 0 WorldCat member libraries worldwide

Specific goals and accomplishments of this research include: (1) The evaluation of models of salt diaper ascent that involve either power law, dislocation creep as determined experimentally by Horseman et al. (1993) or linear, fluid-assisted creep as reported by Spiers et al. (1988, 1990, 1992). We have compared models assuming these two, experimentally evaluated flow laws and examined the predictions they make regarding diaper incubation periods, ascent velocities, deviatoric stresses and strain rates. (2) The evaluation of the effects of differential loading on the initiation an of salt structures. (3) Examination of the role of basement faults on the initiation and morphologic evolution of salt structures. (4) Evaluation of the mechanical properties of shale as a function of pressure and determination of the nature of its brittle-ductile transition. (5) Evaluation of the mechanical anisotropies of shales with varying concentrations, distributions and preferred orientations of clay. (6) The determination of temperature and ratedependencies of strength for a shale constitutive model that can be used in numerical models that depend on viscous formulations. (7) Determination of the mechanisms of deformation for argillaceous rocks over awide range of conditions. (8) Evaluation of the effects of H[sub 2]O within clay interlayers, as adsorbed surface layers
Advanced turbine systems-research and development thermal barrier coatings technology : 1st bimonthly report, December 1995( )

3 editions published between 1995 and 1996 in English and held by 0 WorldCat member libraries worldwide

Objectives of this program are to provide an improved thermal barrier system with increased temperature capability and reliability relative to current systems. This report describes the bond coat development and deposition, manufacturing, and repair
Radiation Effects Research Foundation : a cooperative Japan-US research organization. Annual report 1 April 1992-31 March 1993( )

4 editions published between 1993 and 1998 in English and held by 0 WorldCat member libraries worldwide

Theoretical atomic physics for fusion. Annual report, 1993( )

3 editions published between 1992 and 1993 in English and held by 0 WorldCat member libraries worldwide

The understanding of electron-ion collision processes in plasmas remains a key factor in the ultimate development of nuclear fusion as a viable energy source for the nation. Our 1993--1995 research proposal delineated several areas of research in electron-ion scattering theory. In this paper we summarize our efforts in 1993
Northeast Regional Biomass Energy Program. Quarterly report, 9th year, January--March 1992( )

4 editions published in 1992 in English and held by 0 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
Synthesis and analysis of novel polymers with high permselectivity and permeability in gas separation applications. Progress report, December 1991--December 1992( )

4 editions published in 1991 in English and held by 0 WorldCat member libraries worldwide

Significant progress was made toward developing advanced materials for gas separation membrane applications and rationalizing molecular structure and efficacy: Synthesized and tested polyarylates based on terephthalic or isophthalic acid or a tertiary butyl derivative of the isophthalic acid with different diols to illustrate the effects of: ''opening'' the matrix by incorporation of bulky packing inhibiting groups such as the tertiary butyl moiety inhibition of backbone motion via meta connected backbone connections and ''tightening'' of the matrix by incorporation of polar halogens. Completed high temperature characterization of sorption and transport properties for novel materials. Continued studies of the phenyl-substituted polymers aimed at producing super stable high temperature useful polymers for gas separations. Synthesized a polyarylate based on the spirobiindane diol and bibenzoyl acid chloride to incorporate long flat packable bibenzoyl units between packing disruptive spirobiindane units in an attempt to control the segmental level morphology to produce highly selective ''bottleneck'' regions between highly open regions
Progress report by University of Pittsburgh( )

6 editions published between 1992 and 1998 in English and held by 0 WorldCat member libraries worldwide

We investigated the electronic and structural properties of low-dimensional materials and explored the structure-property correlations governing their physical properties. Progress was made on how to interpret the scanning tunneling microscopy and atomic force microscopy images of layered materials and on how to account for charge density wave instabilities in 2-D metals. Materials studied included transition metal chalcogenides, transition metal halides, organic conducting salts, Mo bronzes, A₂PdH₂, fullerenes, squarate tetrahydrate polymers Fe, Cu(C₄O₄)4·H₂O, BEDT salts, etc
Domain wall formation in late-time phase transitions( )

4 editions published between 1992 and 1996 in English and held by 0 WorldCat member libraries worldwide

We investigate domain wall formation in late-time phase transitions. We find that as in the invisible-axion-domain-wall phenomenon, thermal effects alone are insufficient to drive different regions of the Universe to different parts of the disconnected vacuum manifold. This suggests that domain walls do not form unless either there is some supplemental (but perhaps not unreasonable) dynamics to localize the scalar field responsible for the phase transition to the low-temperature maximum (to an extraordinary precision) before the onset of the phase transition, or there is some non-thermal mechanism to produce large fluctuations in the scalar field. The fact the domain wall production is not a robust prediction of late-time transitions may suggest future directions in model building
Capillary liquid chromatography using laser-based and mass spectrometric detection. [Capillary zone electrophoresis (CZE) ; micellar electrokinetic capillary kchromatography (MECC)]( )

3 editions published between 1990 and 1992 in English and held by 0 WorldCat member libraries worldwide

The DOE-supported research performed during the past year has mainly focused on investigating and minimizing three problems that limit the practical utility of these capillary electrokinetic separation techniques in chemical analysis. (1) Analyses are hindered by poor reproducibility. This is largely a result of complicated and irreproducible capillary wall-solute interactions that often result in adsorption and mobility changes. (2) While the (micellar electrokinetic capillary chromatography) (MECC) technique permits the separations of neutral solutes, hydrophobic compounds are difficult to separate and manipulation of capacity factors (k's) is critically important. (3) The very small solute band volumes require that on-column detection be performed (usually optical detection) and this seriously limits detectability. In addition to these projects, the electrokinetic equivalent of affinity chromatography and development of remote fiber-optic sensors to measure chemical carcinogens and other compounds have been investigated. 5 refs., 2 figs
Studies in Medium Energy Physics. [Dept. of Physics, Univ. of Texas at Austin, Austin, Texas]( )

4 editions published between 1991 and 1992 in English and held by 0 WorldCat member libraries worldwide

This report discusses the following research: p + A precision elastic forward angle cross sections; polarized nuclear target project; and search for very rare K{sup L} decays. (LSP)
The production and destruction of negative ions. Progress report, September 1, 1992--August 31, 1993( )

3 editions published between 1993 and 1997 in English and held by 0 WorldCat member libraries worldwide

Single photon absorption-single electron detachment from few-electron atomic negative ions was studied. A crossed beam apparatus is being used to perform energy- and angle-resolved photoelectron spectroscopic measurements following photodetachment. Forward-directed electrons were collected and energy analyzed. The kinetic energies and yields of the photoelectrons were obtained by fitting the spectral peaks to Gaussian functions. Electron affinities, asymmetry parameters and cross sections are determined from these measurements. A ratio method in which the cross section for the ion of interest is measured relative to that of a reference ion was used. The study of the photodetachment of Li⁻ was completed, and attention has turned to the photodetachment of the stable ion B⁻ and the metastable ion Be⁻
Particle simulation algorithms with short-range forces in MHD and fluid flow( )

3 editions published between 1992 and 1993 in English and held by 0 WorldCat member libraries worldwide

We examine the conditions for the existence of spectrally stable neutral modes in a Vlasov-Poisson plasma and show that for stable equilibria of systems that have unbounded spatial domain, the only possible neutral modes are those with phase velocities that correspond to stationary inflection points of the equilibrium distribution function. It is seen that these neutral modes can possess positive or negative free energy
Nonlinear dynamics and plasma transport( )

3 editions published between 1993 and 1995 in English and held by 0 WorldCat member libraries worldwide

This progress report reports work done on a program in nonlinear dynamical aspects of plasma turbulence and transport funded by DOE from 1992-1995. The purpose of this program has been to promote the utilization of recent pathbreaking developments in nonlinear science in plasma turbulence and transport and to fully utilize the scientific expertise of Russian fusion and plasma community in collaboration with our group to address outstanding fusion theory problems. In the work reported in our progress report, we have studied simple models which are motivated by observation on actual fusion devices. The models focus on the important physical processes without incorporating the complexity of the geometry of real devices. We have also studied linear stability problems which incorporated important physics issues related to geometry involving closed field lines and open field lines. This allows for a deeper analysis and understanding of the system both analytically and numerically. The strong collaboration between the Russian visitors and the US participants has led to a fruitful and strong research program that taps the complementary analytic and numerical capabilities of the two groups. Over the years several distinguished Russian visitors have interacted with various members of the group and set up collaborative work which forms a significant part of proposed research. Dr. Galeev, Director of the Space Research Institute of Moscow and Dr. Novakovskii from the Kurchatov Institute are two such ongoing collaborations. 21 refs
Committee on Atomic, Molecular, and Optical Sciences (CAMOS)( )

5 editions published between 1992 and 1997 in English and held by 0 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
Boron in nuclear medicine : New synthetic approaches to PET and SPECT. Progress report, May 1, 1993--April 30, 1994( )

3 editions published between 1992 and 1994 in English and held by 0 WorldCat member libraries worldwide

New methods based on reactive organometallic precursors containing organic functional groups that are generally responsible for physiologic responses are being exploited for preparation of radiopharmaceutials. This program focuses on the design of new chemistry (molecular architecture) and technology as opposed to the application of known reactions to the synthesis of specific radiopharmaceutical. The new technology which is often based on organoborane chemistry is then utilized in nuclear medicine research at the UT Biomedical Imaging Center and in collaboration with colleagues at other DOE. facilities such as Brookhaven National Laboratory and Oak Ridge National Laboratory. New radiopharmaceutical are evaluated preclinically by colleagues at UT, Emory University and The University of Pennsylvania, and by Nova Screen
A tumbling top-quark condensate model( )

3 editions published between 1992 and 1996 in English and held by 0 WorldCat member libraries worldwide

We propose a renormalizable model with no fundamental scalars which breaks itself in the manner of a ''tumbling'' gauge theory down to the standard model with a top-quark condensate. Because of anomaly cancellation requirements, this model contains two color sextet fermions (quixes), which are vector-like with respect to the standard model gauge group. The model also has a large number of pseudo-Nambu-Goldstone bosons, some of which can be light. The top-quark condensate is responsible for breaking the electroweak gauge symmetry and gives the top quark a large mass. We discuss the qualitative features and instructive shortcomings of the model in its present form. We also show that this model can be naturally embedded into an aesthetically pleasing model in which the standard model fermion appear symmetrically
SPECT assay of radiolabeled monoclonal antibodies. Progress report, September 1, 1992--August 24, 1993( )

3 editions published between 1992 and 1993 in English and held by 0 WorldCat member libraries worldwide

The overall goal of this project is to improve the effectiveness of single photon emission computed tomography (SPECT) to image and quantify radiolabeled monoclonal antibodies. During the past year, we have made significant progress toward this goal, and this report summarizes that work. Our efforts have been mainly directed along three fronts. First, we have developed and tested new reconstruction methods including three-dimensional iterative algorithms that model non-uniform attenuation and distance-dependent detector response. Both fan beam and parallel beam collimator geometries have been modeled and novel ways of improving the efficiency of the computationally intensive methods have been introduced. Second, an ultra-high resolution, small field-of-view pinhole collimator has been constructed and evaluated. Reconstructed spatial resolution of 1 to 3 mm (FWHM) has been achieved in phantom scans with a useful field-of-view of 9 to 10 cm. Finally, we have investigated the ability of SPECT to image and quantify astatine-211 distributions. Reconstructed images of phantom data demonstrated quantitative accuracy to within 10% with proper attenuation and scatter compensation
Measurements of scattering processes in negative ion-atom collisions. [3 to 50 keV]( )

4 editions published between 1992 and 1993 in English and held by 0 WorldCat member libraries worldwide

This Technical Progress Report describes the progress made on the research objectives during the past twelve months. This research project is designed to provide measurements of various scattering processes which occur in H[sup [minus]] collisions with atomic (specifically, noble gas and atomic hydrogen) targets at intermediate energies. These processes include elastic scattering, single- and double-electron detachment, and target excitation/ionization. For the elastic and target inelastic processes where H[sup [minus]] is scattered intact, the experimental technique of Ion Energy-Loss Spectroscopy (IELS) will be employed to identify the final target state(s). In most of the above processes, cross sections are unknown both experimentally and theoretically. The measurements in progress will provide either experimentally determined cross sections or set upper limits to those cross sections. In either case, these measurements will be stringent tests of our understanding in energetic negative ion - atom collisions. In addition secondary negative particle emission yields for H[sup 0] on Cu in the 3 to 50 keV range are shown
Theoretical and experimental study of mixed solvent electrolytes. Final report, July 1, 1988--December 31, 1991( )

3 editions published between 1991 and 1995 in English and held by 0 WorldCat member libraries worldwide

The goals of the research program have evolved into the following: Molecular simulation of phase equilibria in aqueous and mixed solvent electrolyte solutions; molecular simulation of solvation and structure in supercritical aqueous systems; extension of experimental database on mixed solvent electrolytes; analysis of the thermodynamic properties of mixed solvent electrolyte solutions and mixed electrolyte solutions using fluctuation solution theory; development of analytic expressions for thermodynamic properties of mixed solvent electrolyte solutions using analytically solved integral equation approximations; and fundamental modeling of mixed solvent electrolytes using numerically solved integral equation approximation theories. We report and evaluate our progress during the period of the grant in light of these six goals in detail in this paper
Studies of fluctuation processes in nuclear collisions. Progress report, March 1, 1992--February 28, 1993( )

6 editions published between 1992 and 1996 in English and held by 0 WorldCat member libraries worldwide

This report discusses the following topics: Memory effect in Boltzmann-Langevin model; effect of memory time on agitation of unstable modes in nuclear matter; and non-markovian approach to damping of giant monopole resonances in nuclei
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English (78)