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United States Department of Energy Oak Ridge Operations

Works: 1,912 works in 2,209 publications in 1 language and 2,233 library holdings
Roles: Researcher
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Advanced thermal barrier coating system development Technical progress report ( )
11 editions published between 1996 and 2000 in English and held by 11 WorldCat member libraries worldwide
The objectives of the program are to provide an improved TBC system with increased temperature capability and improved reliability relative to current state of the art TBC systems. The development of such a coating system is essential to the ATS engine meeting its objectives. The base program consists of three phases: Phase I: Program Planning - Complete; Phase II: Development - Complete; and Phase III: Selected Specimen - Bench Test. Work was performed on the Phase II final report and on III of the program during the reporting period
[Research in theoretical nuclear physics Progress report] ( )
6 editions published between 1990 and 1992 in English and held by 6 WorldCat member libraries worldwide
The work done during the past year or so may be divided into three separate areas, low energy nuclear reactions, intermediate energy physics and nuclear structure studies. In this paper, we shall separately summarize our achievements made in these three areas
Nuclear structure from radioactive decay. Annual progress report ( )
5 editions published between 1990 and 1992 in English and held by 5 WorldCat member libraries worldwide
This report discusses nuclear structure from radioactive decay of the following: Neutron-Deficient Iridium Isotopes; Neutron-Deficient Platinum Isotopes; Neutron-Deficient Gold Isotopes; Neutron-Deficient Mercury Isotopes; Neutron-Deficient Thallium Isotopes; Neutron-Deficient Lead Isotopes; Neutron-Deficient Samarium Isotopes; Neutron-Deficient Promethium Isotopes; Neutron-Deficient Neodymium Isotopes; and Neutron-Deficient Praseodymium Isotopes. Also discussed are Nuclear Systematics and Models
Research and development of methods ( )
4 editions published between 1992 and 1993 in English and held by 4 WorldCat member libraries worldwide
Purpose is to help managers approach their responsibilities proactively, so that they can anticipate problems and take actions to alleviate or eliminate those problems. Continuous performance improvement, the philosophy behind total quality management, requires working cooperatively to do a little better each day. The most effective tools are working through a closed set of 9 methods: setting expectations, charting, defining indicators and standards, collecting and logging data, converting data to information, organizing and presenting information, reviewing status and progress, self-management, and appraising. In addition, there are 8 rules: focus on what you can do, supply physical evidence of progress, pay attention to detail, inspect (don't expect), review progress routinely and frequently, face ''success/fail'' squarely, communicate crisply, and conduct honest, open appraisals. Scope and plans of the draft research plan (study areas) are described
Negative ion detachment cross sections. Interim progress report ( )
4 editions published between 1991 and 1992 in English and held by 4 WorldCat member libraries worldwide
The authors have measured absolute cross sections for electron detachment and charge exchange for collision of O and S with atomic hydrogen, have investigated the sputtering and photodesorption of negative ions from gas covered surfaces, and have begun an investigation of photon-induced field emission of electrons from exotic structures. Brief descriptions of these activities as well as future plans for these projects are given below
Nuclear spectroscopic studies. Progress report ( )
4 editions published between 1993 and 1996 in English and held by 4 WorldCat member libraries worldwide
The Nuclear Physics group at the University of Tennessee, Knoxville is involved in several aspects of heavy-ion physics including both nuclear structure and reaction mechanisms. While our main emphasis is on experimental problems involving heavy-ion accelerators, we have maintained a strong collaboration with several theorists in order to best pursue the physics of our measurements. During the last year we have led several experiments at the Holifield Heavy Ion Research Facility and participated in others at Argonne National Laboratory. Also, we continue to be very active in the collaboration to study ultra-relativistic heavy ion physics utilizing the SPS accelerator at CERN in Geneva, Switzerland and in a RHIC detector R D project. Our experimental work is in four broad areas: (1) the structure of nuclei at high angular momentum, (2) heavy-ion induced transfer reactions, (3) the structure of nuclei far from stability, and (4) ultra-relativistic heavy-ion physics. The results of studies in these particular areas will be described in this document in sections IIA, IIB, IIC, and IID, respectively. Areas (1), (3), and (4) concentrate on the structure of nuclear matter in extreme conditions of rotational motion, imbalance of neutrons and protons, or very high temperature and density. Area (2) pursues the transfer of nucleons to states with high angular momentum, both to learn about their structure and to understand the transfer of particles, energy, and angular momentum in collisions between heavy ions. An important component of our program is the strong emphasis on the theoretical aspects of nuclear structure and reactions
Theoretical and experimental study of mixed solvent electrolytes ( )
3 editions published between 1990 and 1995 in English and held by 4 WorldCat member libraries worldwide
The goals of the research program evolved into six areas: 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. Fundamental modeling of mixed solvent electrolytes using numerically solved integral equation approximation theories
Studies in Medium Energy Physics. Final technical report ( )
4 editions published between 1991 and 1994 in English and held by 4 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)
Correlations between surface structure and catalytic activity ( )
4 editions published between 1990 and 1994 in English and held by 4 WorldCat member libraries worldwide
Objective is to address the keys to understanding the relation between surface structure and catalytic activity/selectivity. Of concern are questions related to enhanced catalytic properties of mixed-metal catalysts and critical active site requirements for molecular synthesis and rearrangement. The experimental approach utilizes a microcatalytic reactor contiguous to a surface analysis system, an arrangement which allows in vacuo transfer of the catalyst from one chamber to the other. Surface techniques being used include Auger (AES), UV and X-ray photoemission spectroscopy (UPS and XPS), temperature programmed desorption (TPD), low energy electron diffraction (LEED), high resolution electron energy loss spectroscopy (HREELS) and infrared reflection-absorption spectroscopy (IRAS). Our research program builds upon our previous experience relating the results of single crystal kinetic measurements with the results obtained with supported analogs. As well we are exploiting our recent work on the preparation, the characterization, and the determination of the catalytic properties of ultra-thin metal and metal oxide films. The program is proceeding toward the study of the unique catalytic properties of ultrathin metal films; the investigation of the critical ensemble size requirements for principal catalytic reaction types; and the modelling of supported catalysts using ultra-thin planar oxide surfaces
Elementary particle physics at the University of Florida. Annual report ( )
4 editions published between 1991 and 1996 in English and held by 4 WorldCat member libraries worldwide
This report discusses research in the following areas: theoretical elementary particle physics; experimental elementary particle physics; axion project; SSC detector development; and computer acquisition. (LSP)
A program in Medium-Energy Nuclear Physics ( )
3 editions published between 1990 and 1991 in English and held by 3 WorldCat member libraries worldwide
This report discusses research on the following topics: single electron scattering; coincidence electron scattering; photonuclear reactions; pion scattering; and the GWU nuclear detector. (LSP)
Mechanical properties and modeling of seal-forming lithologies ( )
3 editions published between 1992 and 1998 in English and held by 3 WorldCat member libraries worldwide
This proposal includes: (1) a summary of research accomplished over the last three year period on the mechanical properties and modeling of shales and rocksalt, two lithologies that deform readily and form seals to major petroleum and gas reservoirs, and (2) a renewal proposal to extend both the experimental and modeling studies and to integrate the two, incorporating both rocksalt and shale flow laws to investigate the development of structural traps. The numerical modeling efforts to simulate the development of salt structures and the experimental efforts to determine a rate-dependent deformation law for shale have proceeded somewhat independently as well-determined rheologies for rocksalt were available at the outset of the project that could be incorporated into the models, whereas well-constrained rate-dependent constitutive relationships for shales were unavailable. However, both studies have been carried out with a common goal of examining their roles in the development of structural traps
The behavior of matter under non-equilibrium conditions Fundamental aspects and applications ( )
3 editions published between 1989 and 1992 in English and held by 3 WorldCat member libraries worldwide
This report briefly discusses concepts of chaotic systems. The topics discusses are: Bernoulli maps; mathematical aspects of the complex spectral representations; and large poincare systems. (LSP)
Synthesis of new high performance lubricants and solid lubricants ( )
3 editions published between 1992 and 1993 in English and held by 3 WorldCat member libraries worldwide
We have started to make a number of classes of new perfluoropolyethers both in the solid lubricant area and liquid lubricant area. We have prepared some chlorofluoroethers for testing as additives for normal petroleum and polyalphaolefin lubricants which are so widely used in the United States. Perfluoropolyethers are not soluble in hydrocarbons. On the other hand, these chlorofluoropolyethers are soluble in substantial amounts in simple hydrocarbons. These are uniquely capable of being additives that flow with the motor oil or the polyalphaolefin
Nonlinear dynamics and plasma transport ( )
3 editions published between 1992 and 1995 in English and held by 3 WorldCat member libraries worldwide
In this paper we summarize the progress made over the last year in three different areas of research: (a) shear flow generation and reduced transport in fluids and plasma, (b) nonlinear dynamics and visualization of 3D flows, and (c) application of wavelet analysis to the study of fractal dimensions in experimental and numerical data
Dark matter axions and caustic rings ( )
3 editions published between 1992 and 1997 in English and held by 3 WorldCat member libraries worldwide
The physics of axions is briefly reviewed theoretically, and various constraints on the axion mass are recounted. Then the two main contributions to the present cosmological axion energy density, that due to the realignment of the vacuum during the QCD phase transition and that from axions radiated by cosmic axion strings, are discussed. Next, two detection schemes for axions that are sensitive to different mass ranges, an electromagnetic cavity permeated by a strong magnetic field and a system of superconducting wires embedded in a material transparent to microwave radiation, are described. Finally, the phase space structure of cold dark matter galactic halos is considered. (RWR)
Nuclear structure at intermediate energies. Progress report ( )
3 editions published between 1990 and 1992 in English and held by 3 WorldCat member libraries worldwide
We report here oil the progress that we made for the nine months beginning October 1, 1991 for DOE Grant No. DE-FG05-87ER40309. The report covers the third year of a three year grant. Since we are submitting an accompanying Grant Renewal Proposal, we provide in this report more background information than usual for the different projects. The theme that unites the experiments undertaken by the Bonner Lab Medium Energy Group is a determination to understand in detail the many facets and manifestations of the strong interaction, that which is now referred to as nonperturbative QCD. Whether we are investigating the question of just what does carry the spin of baryons, or the extent of the validity of the SU(6) wavefunctions for the excited hyperons (as will be measured in our CEBAF experiment), or questions associated with the formation of a new state of matter predicted by QCD (the subject of AGS {bar p} experiment E854, AGS heavy ion experiment E810, as-well as the approved STAR experiment at RHIC), - all these projects share this common goal. FNAL E683 may well open a new field of investigation in nuclear physics: That of just how colored quarks and gluons interact with nuclear matter as they traverse nuclei of different-sizes. In most all of the experiments mentioned, above, the Bonner Lab Group is playing major leadership roles as well as doing a big fraction of the hard work that such experiments require. We use many of the facilities that are available to the intermediate energy physics community and we use our expertise to design and fabricate the detectors and instrumentation that are required to perform the measurements which we decide to do. The format we follow in the Progress Report is,to provide a concise, but fairly complete write-up on each project. The publications listed in Section In give much greater detail on many of the projects. The aim in this report is to focus on the physics goals, the results, and their significance
Theoretical nuclear reaction and structure studies using hyperons and photons. Final report ( )
3 editions published between 1991 and 1998 in English and held by 3 WorldCat member libraries worldwide
This report details research progress and results obtained during the ten period from June 1, 1988 through May 31, 1998. In compliance with grant requirements the Principal Investigator, Professor Stephen R. Cotanch, has conducted a research program addressing theoretical investigations of reactions involving hyperons and photons. The Principal Investigator has devoted to this program 50% of his time during the academic year and 100% of this time in the summer. Highlights of significant research results are briefly summarized in this report which respectively correspond to the three sub-programs of this project
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 3 WorldCat member libraries worldwide
The research performed during the past year has mainly focused on investigating and minimizing the problems listed below 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 technique permits the separations of neutral solutes, hydrophobic compounds are difficult to separate and manipulation of capacity factors is critically important due to a limited elution range. Because of the limited elution range, it is also beneficial to enhance separation selectivity through the use of non-traditional surfactants. (3) The very small solute band volumes require that on-column'' detection be performed (usually optical detection) and this seriously limits detectability. Laser fluorimetry is particularly amenable to on- column detection with these capillary separation technique. We have explored methods of on-column labeling and multi-wavelength detection to expand the utility of this mode of detection. 35 refs., 7 figs
Application of magnetomechanical hysteresis modeling to magnetic techniques for monitoring neutron embrittlement and biaxial stress ( )
3 editions published between 1992 and 1993 in English and held by 3 WorldCat member libraries worldwide
The objective is to investigate experimentally and theoretically the effects of neutron embrittlement and biaxial stress on magnetic properties in steels, using various magnetic measurement techniques. Interaction between experiment and modeling should suggest efficient magnetic measurement procedures for determining neutron embrittlement biaxial stress. This should ultimately assist in safety monitoring of nuclear power plants and of gas and oil pipelines. In the first six months of this first year study, magnetic measurements were made on steel surveillance specimens from the Indian Point 2 and D.C. Cook 2 reactors. The specimens previously had been characterized by Charpy tests after specified neutron fluences. Measurements now included: (1) hysteresis loop measurement of coercive force, permeability and remanence, (2) Barkhausen noise amplitude; and (3) higher order nonlinear harmonic analysis of a 1 Hz magnetic excitation. Very good correlation of magnetic parameters with fluence and embrittlement was found for specimens from the Indian Point 2 reactor. The D.C. Cook 2 specimens, however showed poor correlation. Possible contributing factors to this are: (1) metallurgical differences between D.C. Cook 2 and Indian Point 2 specimens; (2) statistical variations in embrittlement parameters for individual samples away from the stated men values; and (3) conversion of the D.C. Cook 2 reactor to a low leakage core configuration in the middle of the period of surveillance. Modeling using a magnetomechanical hysteresis model has begun. The modeling will first focus on why Barkhausen noise and nonlinear harmonic amplitudes appear to be better indicators of embrittlement than the hysteresis loop parameters
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