WorldCat Identities

United States Department of Energy Oak Ridge Operations

Works: 1,916 works in 2,213 publications in 1 language and 8,650 library holdings
Genres: Conference papers and proceedings 
Roles: Researcher
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Most widely held works by United States
Local discrete symmetries from superstring derived models( )

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

Discrete and global symmetries play an essential role in many extensions of the Standard Model, for example, to preserve the proton lifetime, to prevent flavor changing neutral currents, etc. An important question is how can such symmetries survive in a theory of quantum gravity, like superstring theory. In a specific string model the author illustrates how local discrete symmetries may arise in string models and play an important role in preventing fast proton decay and flavor changing neutral currents. The local discrete symmetry arises due to the breaking of the non-Abelian gauge symmetries by Wilson lines in the superstring models and forbids, for example dimension five operators which mediate rapid proton decay, to all orders of nonrenormalizable terms. In the context of models of unification of the gauge and gravitational interactions, it is precisely this type of local discrete symmetries that must be found in order to insure that a given model is not in conflict with experimental observations
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

This annual progress report describes new methods of incorporation of radioiodine into physiologically active compounds (amphetamines), and the use of organoboranes to labeled radiopharmaceuticals with Oxygen- 15, Nitrogen-13, carbon-11 and fluorine-18. Preclinical studies are also reported on evaluation of butyothiophenones as agents acting at dopaminergic or serotonic synapses
Capillary liquid chromatography using laser-based and mass spectrometric detection. Final technical progress report, September 1, 1989--January 31, 1993( )

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

In the years following the 1986 seminal paper (J. Chromatogr. Sci., 24, 347-352) describing modern capillary zone electrophoresis (CZE), the prominence of capillary electrokinetic separation techniques has grown. A related electrochromatographic technique is micellar electrokinetic capillary chromatography (MECC). This report presents a brief synopsis of research efforts during the current 3-year period. In addition to a description of analytical separations-based research, results of efforts to develop and expand spectrometric detection for the techniques is reviewed. Laser fluorometric detection schemes have been successfully advanced. Mass spectrometric research was less fruitful, largely owing to personnel limitations. A regenerable fiber optic sensor was developed that can be used to remotely monitor chemical carcinogens, etc. (DLC)
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
Mechanical properties and modeling of seal-forming lithologies. Technical progress report No. 3, March 15, 1992--June 14, 1993( )

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 H₂O within clay interlayers, as adsorbed surface layers
Committee on Atomic, Molecular, and Optical Sciences (CAMOS). Technical progress report & continuation proposal, February 1, 1993--January 31, 1994( )

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 (CAMOS) of the National Research Council (NRC) is charged with monitoring the health of the field of atomic, molecular, and optical (AMO) science in the United States. Accordingly, the Committee identifies and examines both broad and specific issues affecting the field. Regular meetings, teleconferences, briefings from agencies and the scientific community, the formation of study panels to prepare reports, and special symposia are among the mechanisms used by the CAMOS to meet its charge. This progress report presents a review of CAMOS activities from February 1, 1993 to January 31, 1994. The details of prior activities are discussed in earlier progress reports. This report also includes the status of activities associated with the CAMOS study on the field that is being conducted by the Panel on the Future of Atomic, Molecular, and Optical Sciences (FAMOS). During the above period, CAMOS has continued to track and participate in, when requested, discussions on the health of the field. Much of the perspective of CAMOS has been presented in the recently-published report Research Briefing on Selected Opportunities in Atomic, Molecular, and Optical Sciences. That report has served as the basis for briefings to representatives of the federal government as well as the community-at-large. In keeping with its charge to monitor the health of the field, CAMOS launched a study designed to highlight future directions of the field
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

Attempts are made to develop numerical algorithms for handling fluid flows involving liquids and liquid-gas mixtures. In these types of systems, the short-range intermolecular interactions are important enough to significantly alter behavior predicted on the basis of standard fluid mechanics and magnetohydrodynamics alone. We have constructed a particle-in-cell (PIC) code for the purpose of studying the effects of these interactions. Of the algorithms considered, the one which has been successfully implemented is based on a MHD particle code developed by Brunel et al. In the version presented here, short range forces are included in particle motion by, first, calculating the forces between individual particles and then, to prevent aliasing, interpolating these forces to the computational grid points, then interpolating the forces back to the particles. The code has been used to model a simple two-fluid Rayleigh-Taylor instability. Limitations to the accuracy of the code exist at short wavelengths, where the effects of the short-range forces would be expected to be most pronounced
Progress report by Mo.) Washington University (Saint Louis( )

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

During this past year the emphasis has been on identifying the break point of the deletions in alcohol dehydrogenase induced by tritium
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

Objective of the ATS program is the development of ultra-highly efficient, environmentally superior, and cost-competitive gas turbine systems, using thermal barrier coatings. These coatings should be stable in the thermal and corrosive environments of the industrial engine for up to 2500 hours. Phase II (development) is current
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⁻
Nonlinear dynamics and plasma transport. Progress report, September 15, 1992--September 14, 1993( )

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
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

Progress is briefly reported in the following areas: p + A precision elastic forward-angle cross sections for 500- to 800-MeV p on [sup 40]Ca; precision measurement of D[sub NN] for [sup 13]C([rvec p], [rvec p]) at 500 MeV; design of a polarized nuclear target; search for very rare K[sub L] decays; search for the H dibaryon; experimental search for quark -- gluon plasma; and theoretical work on proton -- nucleus scattering
Final report by Yale University( )

5 editions published between 1989 and 1997 in English and held by 0 WorldCat member libraries worldwide

We have refined a heat treatment to obtain coherent, heterogeneous nucleation of precipitates on dislocations in a high purity binary alloy. This allowed, for the first time, a quantitative comparison to be made for coherent heterogeneous nucleation. This part of the research resulted from our concern about the role of dislocations in sub-boundaries in aluminum alloys and directed us to first examine isolated dislocations in the binary Al-Li systems. We were able to design the experiment so the heterogeneous nucleation of AL₃Li occurred. Previously, only homogeneous nucleation of Al₃Li had been examined
Radiation Effects Research Foundation : a cooperative Japan-US research organization. Annual report 1 April 1994-31 March 1995( )

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

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

The authors extend the model of string as a polymer of string bits to the case of superstring. They mainly concentrate on type II-B superstring, with some discussion of the obstacles presented by not II-B superstring, together with possible strategies for surmounting them. As with previous work on bosonic string work within the light-cone gauge. The bit model possesses a good deal less symmetry than the continuous string theory. For one thing, the bit model is formulated as a Galilei invariant theory in (D - 2) + 1 dimensional space-time. This means that Poincare invariance is reduced to the Galilei subgroup in D - 2 space dimensions. Naturally the supersymmetry present in the bit model is likewise dramatically reduced. Continuous string can arise in the bit models with the formation of infinitely long polymers of string bits. Under the right circumstances (at the critical dimension) these polymers can behave as string moving in D dimensional space-time enjoying the full N = 2 Poincare supersymmetric dynamics of type II-B superstring
Studies of fluctuation processes in nuclear collisions. Progress report, May 1, 1994--February 28, 1995( )

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

Investigations of various aspects of heavy-ion collisions were carried out in the framework of the Boltzmann-Langevin Model (BLM). In a previous work, by projection the BLM onto a collective space, a memory-dependent collective transport model was reduced. This model was applied to thermal fission to investigate the influence of the memory effects on the fission dynamics. Some results of the calculations are presented. In addition a reduction of the relativistic BLM to a two-fluid model was carried out, and transport coefficients associated with fluid dynamical variables was carried out. Then this model was applied to investigate equilabration and fluctuation properties in a counter-streaming nuclear fluid
Theoretical and experimental study of mixed solvent electrolytes( )

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
Northeast Regional Biomass Energy Program( )

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
SPECT assay of radiolabeled monoclonal antibodies( )

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. Technical progress report, 1 September 1991--31 August 1992( )

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⁻ 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⁻ 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. This series of experiments required the construction of a new facility and the initial ion beam was accelerated through the apparatus in April 1991
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