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1,091 Matching Results
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Development of mild gasification process
Under a previous contract with Morgantown Energy Technology Center (METC), Department of Energy (DOE) Contract No. DE-AC21-84MC21108, UCC Research Corporation (UCCRC) built and tested a 1500 lb/day Mild Gasification Process Development Unit (MGU). The MGU, as tested under the previous contract, is shown in Figure 1. Testing completed under the previous contract showed that good quality hydrocarbon liquids and good quality char can be produced in the MGU. However, the MGU is not optimized. The primary objectives of the current project are to optimize the MGU and determine the suitability of char for several commercial applications. The program consists of four tasks; Task 1-Test Plan; Task 2-Optimization of Mild Gasification Process; Task 3-Evaluation of Char and Char/Coal Blends as a Boiler/Blast Furnace Fuel; and Task 4-Analysis of Data and Preparation of Final Report. Task 1 has been completed while work continued on Task 2.
Date:
February 1, 1988
Creator:
Chu, C.I.C. & Gillespie, B.L.
Object Type:
Report
System:
The UNT Digital Library
Lithium corrosion/mass transfer test facility
Liquid lithium is a leading candidate as a tritium breeding material for fusion reactors because of its good breeding and heat-transfer characteristics. This paper describes a new experimental facility for investigating the corrosion/mass transfer/deposition mechanisms at characteristic velocities and system temperatures. This test facility, which is constructed of ferritic/martensitic steel (Fe-9Cr-1Mo), simulates conditions projected for a liquid metal heat transport system. The test facility will provide test velocities to 0.5 m/s, and temperatures to 550/degree/C, and system ..delta..T's up to 150/degree/C. The corrosion test region simulates the blanket region with a low inlet temperature and a higher (..delta..T /approximately/ 150/degree/C) outlet temperature. Test specimens in the deposition region provide a measure of the deposition processes that will occur in a heat exchanger as the liquid metal is cooled (..delta..T /approximately/ 150/degree/C). In addition to temperature and flow control, the facility provides for control and monitoring of impurities in the liquid.
Date:
February 1, 1988
Creator:
Smith, D. L.; Chopra, O. K. & Hull, A. B.
Object Type:
Article
System:
The UNT Digital Library
Fermi level dependent native defect formation: Consequences for metal-semiconductor and semiconductor-semiconductor interfaces
The amphoteric native defect model of the Schottky barrier formation is used to analyze the Fermi level pinning at metal/semiconductor interfaces for submonolayer metal coverages. It is assumed that the energy required for defect generation is released in the process of surface back-relaxation. Model calculations for metal/GaAs interfaces show a weak dependence of the Fermi level pinning on the thickness of metal deposited at room temperature. This weak dependence indicates a strong dependence of the defect formation energy on the Fermi level, a unique feature of amphoteric native defects. This result is in very good agreement with experimental data. It is shown that a very distinct asymmetry in the Fermi level pinning on p- and n-type GaAs observed at liquid nitrogen temperatures can be understood in terms of much different recombination rates for amphoteric native defects in those two types of materials. Also, it is demonstrated that the Fermi level stabilization energy, a central concept of the amphoteric defect system, plays a fundamental role in other phenomena in semiconductors such as semiconductor/semiconductor heterointerface intermixing and saturation of free carrier concentration. 33 refs., 6 figs.
Date:
February 1, 1988
Creator:
Walukiewicz, W.
Object Type:
Article
System:
The UNT Digital Library
Beryllium Science: US-UK agreement on the use of Atomic Energy for mutual defense
Twenty-seven papers are presented on beryllium supply, production, fabrication, safe handling, analysis, powder technology, and coatings. Separate abstracts have been prepared for the individual papers. (DLC)
Date:
February 19, 1988
Creator:
Hanafee, J.E. (ed.)
Object Type:
Article
System:
The UNT Digital Library
The DIII-D summary contribution to the final INTOR workshop
In SIII-D, good H-mode confinement has been obtained with up to 6 MW of neutral-beam injection (NBI). In this report we summarize the essential features of divertor operation for DIII-D H-mode plasma. Briefly, our measurements show that: Large edge density and temperarture gradients are obtained with scale lengths of a few cm at the midplane; In the steady state, approximately 10-20% of the input power is deposited on the divertor plates in a region that is peaked on the separatrix and extends radially over )approx equal) 2-4 cm at the outboard intercept. More power (2:1) reaches the outboard intercept than the inboard; Low electron temperature (less than or equal to20eV) and high density (n/sub e//sup div/ )approx equal) n/sub e//sup main/ greater than or equal to 3-10 )times)10/sup 19/ m/sup -3/ at the divertor plates indicate that DIII-D obtains a high-recycling divertor during H-mode. DEGAS neutral transport modeling is consistent with these results; The duration of good H-mode confinement is limited by Edge Localized Modes (ELMs) rather than increasing impurity radiation; The dominant impurities, C and Ni are concentrated in the edge plasma (ra greater than or equal to 0.5) for I/sub p/ greater than or equal to 1 MA; …
Date:
February 26, 1988
Creator:
Hill, D. N.; Allen, S. L.; Brooks, N. H.; Content, D.; DeBoo, J. C.; Gohil, P. et al.
Object Type:
Report
System:
The UNT Digital Library
SOLA-DM: A numerical solution algorithm for transient three-dimensional flows
SOLA-DM is a three-dimensional time-explicit, finite-difference, Eulerian, fluid-dynamics computer code for solving the time-dependent incompressible Navier-Stokes equations. The solution algorithm (SOLA) evolved from the marker-and-cell (MAC) method, and the code is highly vectorized for efficient performance on a Cray computer. The computational domain is discretized by a mesh of parallelepiped cells in either cartesian or cylindrical geometry. The primary hydrodynamic variables for approximating the solution of the momentum equations are cell-face-centered velocity components and cell-centered pressures. Spatial accuracy is selected by the user to be first or second order; the time differencing is first-order accurate. The incompressibility condition results in an elliptic equation for pressure that is solved by a conjugate gradient method. Boundary conditions of five general types may be chosen: free-slip, no-slip, continuative, periodic, and specified pressure. In addition, internal mesh specifications to model obstacles and walls are provided. SOLA-DM also solves the equations for discrete particle dynamics, permitting the transport of marker particles or other solid particles through the fluid to be modeled. 7 refs., 7 figs.
Date:
February 1, 1988
Creator:
Wilson, T. L.; Nichols, B. D.; Hirt, C. W. & Stein, L. R.
Object Type:
Report
System:
The UNT Digital Library
Spectral modelling of the soft gamma ray repeater
This paper summarizes the results of numerical modelling of the spectra of the soft gamma ray repeater (SGR 1806-20). Parameters of the emission region can be extracted from the spectral fits under the simplistic assumption of isothermal and homogeneous emission layers. Limits on the luminosity distance of the source can also be derived if we make specific interpretations of the low frequency turnover in the observed spectrum. 12 refs., 3 figs.
Date:
February 1, 1988
Creator:
Liang, E.P.
Object Type:
Article
System:
The UNT Digital Library
Properties of hydrogen/helium accretion plasmas
We study the properties of impulsively-heated plasmas initially composed of hydrogen and helium. We follow the time-dependent behavior of the ion and electron temperatures, the pair density, and the densities of hydrogen, helium, and nuclei formed in fusion and breakup reactions. We also consider neutron production and escape, and calculate the 0.431 and 0.478 MeV line luminosities from ..cap alpha..-..cap alpha.. fusion reactions, and the 2.22 MeV line luminosity from neutron capture on protons. 13 refs., 3 figs., 1 tab.
Date:
February 1, 1988
Creator:
Guessoum, N. & Dermer, C. D.
Object Type:
Article
System:
The UNT Digital Library
Testimony in Annapolis on 15 February 1988 Before the House Appropriations Committee
Testimony given by Julian C. Stanley to the House Appropriations Committee in Annapolis, Maryland, on February 13, 1988, in which he gives advice to an evolving residential high school in Maryland.
Date:
February 13, 1988
Creator:
Stanley, Julian C.
Object Type:
Text
System:
The UNT Digital Library
Top students visit NT
Article by Steve Delafield and Julie Scherer, detailing the visit of high school students for the Texas Academy of Mathematics and Science preview day.
Date:
February 2, 1988
Creator:
Delafield, Steve & Scherer, Julie
Object Type:
Clipping
System:
The UNT Digital Library
Acoustic Leak Detection for District Heating Systems
An acoustic leak detection facility was completed and used to evaluate the capability of piezoelectric sensors, accelerometers, and capacitance microphones to detect and locate gas and water leaks in underground district heating and cooling (DHC) piping. Leak detection sensitivity and location capabilities for DHC systems were estimated from laboratory data and from data obtained from the underground DH system in Scranton, Pennsylvania, where acoustic background noise levels and acoustic signals from field-induced steam leaks were acquired. Acoustic detection of leaks with flow rates of less than 10 gpm is possible at a distance of several hundred meters, with a location accuracy of a few meters. Although steam leaks of comparable mass loss can be detected over a similar range with transducers mounted on the pipe outer wall, location accuracy of a few meters over this range may only be possible with transducers in direct contract with the steam. Intrusive sensors may also be necessary to detect and locate leaks in plastic pipe.
Date:
February 1988
Creator:
Kupperman, D. S. & Karvelas, D. E.
Object Type:
Report
System:
The UNT Digital Library
Portable Implementation of a Generic Exponential Function in Ada
By presenting a provably accurate implementation of the exponential function, we illustrate that an accurate and portable elementary-function library can be implemented in Ada.
Date:
February 1988
Creator:
Tang, Ping Tak Peter
Object Type:
Report
System:
The UNT Digital Library
Speciation of Radionuclides in Natural Groundwaters, Annual Report: October 1986 through September 1987
Two ultrasensitive laser techniques, laser photoacoustic spectroscopy (LPAS) and laser-induced fluorescence (LIF), are being developed for the detection and speciation of trace levels of actinides in solutions typical of those expected in a high-level waste repository. An LPAS system was set up for these studies. Experiments were carried out to determine the detection limits of plutonium and americium in solution. Concurrently with the LPAS work, LIF studies were carried out on uranyl ion and curium in solution.
Date:
February 1988
Creator:
Doxtader, M. M.; Beitz, J. V.; Reed, Donald Timothy & Bates, John K.
Object Type:
Report
System:
The UNT Digital Library
A Systematic Analysis of the Spectra of the Lanthanides Doped into Single Crystal LaF₃
Report of the correlations between experimental transition energies and computed level structures.
Date:
February 1988
Creator:
Carnall, W. T.; Goodman, G. L.; Rajnak, K. & Rana, R. S.
Object Type:
Report
System:
The UNT Digital Library
Characteristics of the 7-GeV Advanced Photon Source : a Guide for Users
In this document we present the characteristics of the electromagnetic radiation from various types of sources on the 7-GeV Advanced Photon Source (APS) storage ring. The sources include bending magnets, undulators, and wigglers. The characteristics are compared with those of other synchrotron sources when operated at their design specifications. The influence of positron beam size on the on-axis brilliance is discussed, along with the power distribution from these sources. The goal of this document is to provide users with enough information on the characteristics of radiation from the APS storage ring so that experiments can be efficiently planned.
Date:
February 1988
Creator:
Shenoy, G. K.; Viccaro, P. J. & Mills, Dennis M.
Object Type:
Report
System:
The UNT Digital Library
Practical Issues Relating to the Internal Database Predicates in an OR-Parallel Prolog: Extensions and Useful Hacks
This technical report is being written to document and explain some of the insights the authors have gained during the implementation of two OR-parallel Prolog systems for shared-memory multiprocessors. We have been quite amazed by how much power and functionality can be achieved through the implementation of just a few primitive predicates. We introduce a few relatively trivial predicates which allow one to implement versions of findall/3, bagof/3, and setof/3 for the a multiprocessor environment. Then we show how these predicates can be used to implement AND-parallelism. Finally, we illustrate their use for implementing a limited notion of streams, and how such streams can be used to create a compiler that achieves excellent speedups for multiprocessors with a limited number of processors.
Date:
February 1988
Creator:
Carlsson, Mats; Danhof, Ken & Overbeek, Ross
Object Type:
Report
System:
The UNT Digital Library
Reaction of Glass During Gamma Irradiation in a Saturated Tuff Environment, Part 3: Long-Term Experiments at 1x10^4 Rad/Hour
Report on experiments to assess the importance of radiation effects on waste glass corrosion. This third part contains a description of the experiments, results, and discussion, with conclusions and related appendices.
Date:
February 1988
Creator:
Abrajano, Teofilo Aniag; Bates, John K.; Gerding, Thomas J. & Ebert, William L.
Object Type:
Report
System:
The UNT Digital Library
(Pittsburgh Energy Technology Center): Quarterly technical progress report for the period ending June 30, 1987. [Advanced Coal Research and Technology Development Programs]
Research programs on coal and coal liquefaction are presented. Topics discussed are: coal science, combustion, kinetics, surface science; advanced technology projects in liquefaction; two stage liquefaction and direct liquefaction; catalysts of liquefaction; Fischer-Tropsch synthesis and thermodynamics; alternative fuels utilization; coal preparation; biodegradation; advanced combustion technology; flue gas cleanup; environmental coordination, and technology transfer. Individual projects are processed separately for the data base. (CBS)
Date:
February 1, 1988
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
TMI-2 (Three-Mile Island-Unit 2) Rail Cask and Railcar Maintenance
This paper describes the NuPac 125-B cask system (i.e., cask and railcar), and the maintenance and inspection requirements for that system. The paper discusses the operations being done to satisfy those requirements and how, in some cases, it has been efficient for the operations to be more rigorous than the requirements. Finally, this paper discusses the experiences gained from those operations and how specific hardware and procedural enhancements have resulted in a reliable and continuous shipping campaign. 2 refs., 2 figs.
Date:
February 1, 1988
Creator:
Tyacke, M. J.; Ayers, A. L., Jr.; Ball, L. J. & Anselmo, A. A.
Object Type:
Article
System:
The UNT Digital Library
Hierarchical diffusion
We review the solution and properties of the diffusion equation in a hierarchical or ultrametric space. 11 refs.
Date:
February 1, 1988
Creator:
Bachas, C. P.
Object Type:
Article
System:
The UNT Digital Library
On the luminosity of heteroenergetic colliding-beam storage rings
We shall estimate how the luminosity of a heteroenergetic colliding-beam storage-ring system is likely to be restrained by the incoherent beam-beam limit - or, in other words, by the tune-shift limit.
Date:
February 1, 1988
Creator:
Rees, J.
Object Type:
Report
System:
The UNT Digital Library
High-energy laser-assisted imaging through vaporizing aerosols
The degradation of image quality due to multiple scattering in a turbid medium is analyzed various conditions of illumination. The emphasis is on the forward-peaked multiple scattering effects, which can adequately be described by the small-angle approximation. In the case of incoherent illumination, the modulation transfer function (MTF) can be given explicity both in the low- and high-frequency limits. For scattering with smaller degree of anisotropy, the MTF should be imputed numerically by considering numerical by considering solutions to the equation of radiative transfer with a line or point source. As the beam power increases, the turbid medium becomes modified by its interactions with the beam, thus affecting the image resolution. In this nonlinear transport regime (flux levels of the order of 10/sup 6/ Wcm/sup 2/ and higher) the propagation leads actually to beam narrowing. In the context of the imaging problem, an apparent paradosical situation in which the image of a point source narrows down as the high-energy laser (HEL) beam propagates is discussed. 14 refs., 12 figs
Date:
February 1, 1988
Creator:
Zardecki, A. & Gerstl, S.A.W.
Object Type:
Article
System:
The UNT Digital Library
North Texas State University Office of Research and Academic Grants
A proposal review and routing form from the North Texas State University Office of Research and Academic Grants filled out by Jack Davis and William McCarter for their Art video cassette tap project. The proposal was submitted to the National Endowment for the Arts for grant support starting October 1, 1988 and ending September 31, 1989. The following pages are the organization grant application form filled with the expected expenses.
Date:
February 25, 1988
Creator:
North Texas Institute for Educators on the Visual Arts
Object Type:
Text
System:
The UNT Digital Library
Preparing the Alcator C bolometer system for use on MTX (Microwave Tokamak Experiment)
The Alcator C bolometer array has been modified to be compatible with electron cyclotron heating on the Microwave Tokamak Experiment. Fine wire mesh screens are mounted on the front of the bolometer collimator tubes to attenuate microwave heating of the bolometers. Structural changes eliminate openings in the seams of the bolometer housing, which represent pathways for microwaves to enter the system. This paper outlines the operational principles of the bolometer system, discusses the measured and predicted performance characteristics of the bolometer array, and includes a concise guide to the operation of the bolometer controller. 5 refs., 5 figs., 1 tab.
Date:
February 9, 1988
Creator:
Marinak, M.
Object Type:
Report
System:
The UNT Digital Library