UNT Libraries Government Documents Department - 853 Matching Results

Search Results

Results: 1 - 24 next
open access

Transverse mode coupling in RHIC

Description: In the Proceedings of the Workshop on the RHIC Performance, it was stated that the transverse mode coupling instability, posed a potential intensity limitation for protons. This was based on the expression I{sub b} = 4(E{sub t}/qe) Q{sub s} 4 {radical}{pi} {sigma} {ell}/(Im (Z{sub {perpendicular}}) < {beta}{sub {perpendicular}} > R 3) where E{sub t} is the total energy, q the charge state, Q{sub s} the synchrotron tune, < {beta}{sub {perpendicular}} > the average beta function, R the machine ra… more
Date: February 21, 1990
Creator: Raka, E.
Item Type: Refine your search to only Report
open access

Ultra-high brightness (10 sup 21 W/cm sup 2 ) laser facility

Description: New short-pulse laser technology has made possible the production of extremely bright laser sources. The use of these new techniques on large scale Nd:Glass based laser systems would make it possible to produce 1000 TW (Petawatt) pulses. Such pulses would yield focused intensities exceeding 10{sup 21}W/cm{sup 2} corresponding to an electric field in excess of 100 e/a{sub 0}{sup 2} and an energy density equivalent to that of a 10 keV blackbody. Such a source would have important applications in … more
Date: March 21, 1990
Creator: Perry, M. D.; Campbell, E. M.; Hunt, J. T.; Keane, C.; Szoke, A. (Lawrence Livermore National Lab., CA (USA)); Mourou, G. et al.
Item Type: Refine your search to only Article
open access

Energy Efficiency and Least-Cost Planning: The Best Way to Save Money and Reduce Energy Use in Hawaii

Description: If the 500 MW geothermal project on the Big Island of Hawaii is developed as planned, the Wao Kele O Puna rain forest will be severely damaged or destroyed. If this happens the State will lose one of its most precious resources. It would be tragic for this to happen, since on a least-cost basis, the geothermal project does not make economic sense. Improving energy efficiency in the commercial and residential sectors of Hawaii can save about 500 MW of power at a cost of $700 million.
Date: May 21, 1990
Creator: Mowris, Robert J.
Item Type: Refine your search to only Report
open access

The heat transport system and plant design for the HYLIFE-2 fusion reactor

Description: HYLIFE is the name given to a family of self-healing liquid-wall reactor concepts for inertial confinement fusion. This HYLIFE-II concept employs the molten salt, Flibe, for the liquid jets instead of liquid lithium used in the original HYLIFE-I study. A preliminary conceptual design study of the heat transport system and the balance of plant of the HYLIFE-II fusion power plant is described in this paper with special emphasis on a scoping study to determine the best intermediate heat exchanger … more
Date: August 21, 1990
Creator: Hoffman, M. A.
Item Type: Refine your search to only Article
open access

Stimulated Raman scatter from laser-produced plasmas: Merely nonlinear or also chaotic

Description: Stimulated Raman scattering in plasmas is a three-wave instability with important practical consequences for laser fusion. Most studies of this process to date have focused on its threshold. Even the linear-theory threshold poses interesting problems; and observed thresholds have been difficult to interpret. However, with increasing evidence that this instability often becomes absolute, it has become appropriate to examine saturation mechanisms as well. A number of such mechanisms are discussed… more
Date: August 21, 1990
Creator: Drake, R. P. & Batha, S. H.
Item Type: Refine your search to only Article
open access

Ames test results on shot-tank residues

Description: In August 1987, a routine Ames test on soot from the Lawrence Livermore National Laboratory (LLNL) 4-in. gun showed that the soot was mutagenic to Salmonella bacteria. Subsequent liquid chromatography on the soot showed that, out of hundreds of ultravoilet-absorbing compounds found in the residue, only three or four were mutagenic. When a sample large enough to weigh was collected, it was found that No environmentally identified complex mixture has ever been reported with as much Ames/Salmonell… more
Date: September 21, 1990
Creator: Bloom, G.H.
Item Type: Refine your search to only Article
open access

An analysis of commerical zeolite catalysts by multinuclear NMR

Description: This work involves studying two commercial hydrocracking catalysts by solid state multinuclear NMR silicon 29 and aluminum 27 with the goal of developing a method of determining the fraction zeolite in the catalysts. The zeolite fraction is known to be one of the faujasite zeolites type X or Y. The clay matrix of the catalyst is assumed to be kaolinite. Fresh, air-exposed commercial hydrocracking catalysts were provided by Phillips Petroleum. Sample 33351-86 was known to be a physical mixture o… more
Date: September 21, 1990
Creator: Flanagan, L.
Item Type: Refine your search to only Report
open access

Bond and Low Cycle Fatigue Behavior of Thermoset Composite Reinforcing for the Concrete Industry

Description: This thesis encompasses two separate research projects. The first project, described in Chapter 2 was a project investigating the fatigue behavior of thermoset Fiber Composite (FC) sandwich wall ties. The second research project detailed in this thesis was a project studying the bond and tensile properties of FC rod and FC fibers.
Date: September 21, 1990
Creator: Barnes, Bruce
Item Type: Refine your search to only Thesis or Dissertation
open access

A characterization of internal-Sn Nb sub 3 Sn superconductors for use in the Proof of Principles (PoP) coil

Description: High performance Ti-alloyed internal-Sn superconductors have been selected for use in the Proof of Principles (PoP) coil, and a 1.0 m o.d., 0.4 m i.d., solenoid designed to produce fields up to 15 T. The PoP coil, which will use forced-flow Cable-In-Conduit Conductors (CICC), will operate at 4.2 K and moderate levels of conductor strain. Here we report the results of detailed characterizations of two proposed PoP coil Nb{sub 3}Sn 19 subelement superconductor wires of different topology. We have… more
Date: September 21, 1990
Creator: Summers, L. T.; Duenas, A. R.; Karlsen, C. E.; Ozeryansky, G. M. & Gregory, E.
Item Type: Refine your search to only Article
open access

Computations of quenching and stability in a CICC (cable-in-conduit conductor) conductor

Description: The quenching and stability behavior of forced-flow helium-cooled, cable-in-conduit conductors (CICC) has been analyzed using a new computer program. This computer analysis code was developed for performing general, transient, thermal analyses on CICCs. The program includes the necessary details for the physical properties of all the constituent materials of such conductors, and accurately models the thermo- and fluid-dynamic behavior of the helium coolant starting from a wide range of initial … more
Date: September 21, 1990
Creator: Wong, R.L.
Item Type: Refine your search to only Article
open access

A conceptual design of the International Thermonuclear Experimental Reactor for the Central Solenoid

Description: Conceptual design of the International Thermonuclear Experimental Reactor (ITER) superconducting magnet system is nearing completion by the ITER Design Team, and one of the Central Solenoid (CS) designs is presented. The CS part of this magnet system will be a vertical stack of eight modules, approximately 16 m high, each having a approximate dimensions of: 4.1-m o.d., 2.8-m i.d., 1.9-m h. The peak field at the bore is approximately 13.5 T. Cable-in-conduit conductor with Nb{sub 3}Sn composite … more
Date: September 21, 1990
Creator: Heim, J. R. & Parker, J. M.
Item Type: Refine your search to only Article
open access

Electrical Resistivity of Some Zintl Phase and the Precursors

Description: Resistivity measurements have been performed for electric characterization of the compounds Ba{sub 5}Sb{sub 3} and Ba{sub 5}Sb{sub 3}Cl, both with the Mn{sub 5}Si{sub 3} structure type, along with Ca{sub 5}Bi{sub 3} and Ca{sub 5}Bi{sub 3}F, both with the {beta}-Yb{sub 5}Sb{sub 3} structure type. These measurements were taken as a function of temperature using the four probe method on pressed polycrystalline pellets of the compounds. A sealed apparatus was developed for containing these air-sens… more
Date: September 21, 1990
Creator: Wolfe, Larry
Item Type: Refine your search to only Thesis or Dissertation
open access

Electrocatalysis of Anodic and Cathodic Oxygen-Transfer Reactions

Description: The electrocatalysis of oxygen-transfer reactions is discussed in two parts. In Part I, the reduction of iodate (IO{sub 3}{sup {minus}}) is examined as an example of cathodic oxygen transfer. On oxide-covered Pt electrodes (PtO), a large cathodic current is observed in the presence of IO{sub 3}{sup {minus}} to coincide with the reduction of PtO. The total cathodic charge exceeds the amount required for reduction of PtO and IO{sub 3}{sup {minus}} to produce an adsorbed product. An electrocatalyt… more
Date: September 21, 1990
Creator: Wels, Brian R.
Item Type: Refine your search to only Thesis or Dissertation
open access

Electrocatalysis of anodic oxygen-transfer reactions at modified lead dioxide electrodes

Description: The electrocatalytic activities were compared for pure and chloride-doped beta-PbO{sub 2} (Cl-PbO{sub 2}) films on gold and platinum substrates. Rate constants were increased significantly for oxidations of Mn{sup 2+}, toluene, benzyl alcohol, dimethylsulphoxide (DMSO) and benzaldehyde in acidic media by the incorporation of Cl{sup {minus}} into the oxide films. These reactions are concluded to occur by the electrocatalytic transfer of oxygen from H{sub 2}O to the reaction products. Results of … more
Date: September 21, 1990
Creator: Hsiao, Yun-Lin.
Item Type: Refine your search to only Report
open access

Exclusive neutral strange particle production from double Pomeron exchange produced by proton-proton interactions at radical s = 62 GeV

Description: Data are presented for the first time on exclusive Pomeron-Pomeron interactions which produce a neutral strange and neutral antistrange particle pair in a central system X. In this paper, the system, X, is identified as one of the following neutral combinations; K{sub s}{sup 0}K{sub s}{sup 0}, K{sub s}{sup 0}K{sup {plus minus}}{pi}{sup {minus plus}}, {Lambda}{sup 0}{bar {Lambda}}{sup 0}, {Lambda}{sup 0}{bar {Lambda}}{sup 0}*. These data were obtained in proton-proton collisions at {radical}s = … more
Date: September 21, 1990
Creator: Skeens, John
Item Type: Refine your search to only Thesis or Dissertation
open access

FENIX (Fusion ENgineering International eXperimental): A test facility for ITER (International Thermonuclear Experimental Reactor) and other new superconducting magnets

Description: The Fusion ENgineering International eXperimental (FENIX) Test Facility which is nearing completion at Lawrence Livermore National Laboratory, is a 76-t set of superconducting magnets housed in a 4-m-diameter cryostat. It represents a significant step toward meeting the testing needs for the development of superconductors appropriate for large-scale magnet applications such as the International Thermonuclear Experimental Reactor (ITER). The magnet set is configured to allow radial access to the… more
Date: September 21, 1990
Creator: Slack, D. S.; Patrick, R. E. & Miller, J. R.
Item Type: Refine your search to only Article
open access

Fundamental Investigations of Supported Monometallic and Bimetallic Catalysts by Proton Magnetic Resonance Spectroscopy

Description: Proton magnetic resonance spectroscopy, or nuclear magnetic resonance (NMR) of hydrogen, has been applied to investigate silica-supported Group VIII monometallic and Group VIII-Group IB bimetallic catalysts and alumina- and silica-supported platinum-rhenium bimetallic catalysts. Two adsorbed states of hydrogen, i.e., irreversible and reversible hydrogen, on the surfaces of monometallic Ru, Pt, and Cu particles and bimetallic Ru-Group Ib, Pt-Group Ib, and Pt-Re particles were observed directly v… more
Date: September 21, 1990
Creator: Wu, Xi
Item Type: Refine your search to only Thesis or Dissertation
open access

The growth, structure, and thermal stability of vapor deposited ultra-thin metal films: Rh on Ag(100), Au on Pd(110), and Pt on Pd(110)

Description: The growth, structure, and thermal stability of ultra-thin metal films (Rh on Ag(100); Au on Pd(110) and Pt on Pd(110)) is investigated using surface sensitive techniques. The three systems studied present a variety of differing characteristics which can contribute to the growth mode, two-dimensional structure, and thermal stability of the films. The main factors contributing to the differing properties of the three systems presented here are: (1) the different substrate morphologies; (2) the d… more
Date: September 21, 1990
Creator: Schmitz, P.
Item Type: Refine your search to only Report
open access

High precision numerical solutions to electric fields in a radial drift chamber

Description: A modification to the proportional chamber design makes it possible to achieve 5{mu}m spatial resolution in particle tracking. Achieving this requires knowing exactly what the electric field is in the chamber, and simple approximations to the field are not accurate enough. The operation of the chamber and techniques which accurately evaluate the electric field are discussed.
Date: September 21, 1990
Creator: Faust, Jonathan
Item Type: Refine your search to only Report
open access

High-resolution angle-resolved photoemission studies of high Tc superconductor Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8

Description: An angle-resolved photoemission study of the normal and superconducting states in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} was performed. Measurements in the normal state show bands dispersing through the Fermi level from at least 350 meV below E{sub F}. The Fermi level crossings are consistant with local-density band calculation, including a point calculated to be of Bi-O character. Additional measurements were made where bands crossed the Fermi level between 100 and 250K, along with measurements… more
Date: September 21, 1990
Creator: Liu, Rong
Item Type: Refine your search to only Thesis or Dissertation
open access

The interactions of water and perfluorodiethyl ether on Ru(100)

Description: We have studied the interactions of water and perfluorodiethyl ether on Ru(100) in order to model the effects of surface structure and humidity on the bonding and decomposition of perfluoroalkyl ether lubricants with metal surfaces. In order to understand the interactions on Ru(100), we have first investigated the interactions of each of these adsorbates alone on the clean surface. The interactions of water with Ru(100) have been studied using both thermal desorption spectroscopy (TDS) and elec… more
Date: September 21, 1990
Creator: Leavitt, Pam
Item Type: Refine your search to only Thesis or Dissertation
open access

Inventory of power plants in the United States 1989. [Contains glossary]

Description: This document is prepared annually by the Electric Power Division, Office of Coal, Nuclear, Electric and Alternate Fuels, Energy Information Administration (EIA), US Department of Energy (DOE). The purpose of this publication is to provide year-end statistics about electric generating units in operation and to provide a 10-year outlook of future generating unit additions by electric utilities in the United States (the 50 states and the District of Columbia). Data summarized in this report are u… more
Date: September 21, 1990
Item Type: Refine your search to only Report
open access

An investigation of the mechanisms of calcination and sulfation in coal-water mixtures

Description: The purpose of this investigation is to study the mechanisms of sulfur capture when burning coal-water-limestone mixtures (CWLM) in fluidized beds. Special care is taken to make comparisons with to dry coal and sorbent under comparable experimental conditions. A series of experiments were performed in an eight-inch diameter bubbling fluidized bed combustor to address this problem. 33 refs., 17 figs., 5 tabs.
Date: September 21, 1990
Creator: Christofides, N.
Item Type: Refine your search to only Report
Back to Top of Screen