267,209 Matching Results

Search Results

prev Results: 43811 - 43834 next
open access

One-dimensional gamma ray and photoneutron shielding calculations for the EBT-P

Description: One-dimensional radiation transport calculations have been performed to obtain estimates of the nuclear heat loads and biological dose rates due to bremsstrahlung gamma rays and photoneutrons in the EBT-P. The bremsstrahlung gamma rays arise because of electron impingement upon the magnetic coil assemblies and these gamma rays in turn produce photoneutrons through interactions in the high Z shielding materials. For a 1 MW electron power loss, /sup 238/U and tungsten coil shield thicknesses of a… more
Date: November 1, 1980
Creator: Lillie, R.A.; Gabriel, T.A.; Bishop, B.L. & Baker, V.C.
Partner: UNT Libraries Government Documents Department
open access

Preconversion processing of bituminous coals: New directions to improved direct catalytic coal liquefaction

Description: Improved coal liquefaction was reinvestigated for the current two-stage process on the basis of the associated molecular nature of coal. Since a significant portion of coal molecules are physically associated as pointed in our recent paper, physical dissolution should be considered. The step-wise, high-temperature soaking is a simple and effective method for coal dissolution. Larger dissolution makes liquefaction severity lower. Broad molecular mass distribution in the associated coal was anoth… more
Date: January 1, 1993
Partner: UNT Libraries Government Documents Department
open access

(Workshop on artificially ionized layers in the atmosphere)

Description: I presented our report which described our technique of inferring electron temperature in a microwave induced plasma. The primary purpose of my trip to Kiev was to present a paper entitled Analysis of Nitrogen Light Emission from Artificially Ionized Layers (AIL) Breakdown'' at the AIL workshop. The AIL concept is to produce an ionized layer in the atmosphere from which radio frequency waves can be reflected. The workshop provided for the transfer of unclassified technology between the US and t… more
Date: October 30, 1989
Creator: Tunnell, T.W.
Partner: UNT Libraries Government Documents Department
open access

A database of PFT ventilation measurements

Description: About five years ago, a method for measuring the ventilation flows of a building was developed at Brookhaven National Laboratory (BNL). This method is based on the use of a family of compounds known as perfluorocarbon tracers or PFTs. Since 1982, BNL has measured ventilation in more than 4000 homes, comprising about 100 separate research projects throughout the world. This measurement set is unique in that it is the only set of ventilation measurements that acknowledge and measure the multizone… more
Date: August 1, 1988
Creator: D'Ottavio, T. W.; Goodrich, R. W.; Spandau, D. J. & Dietz, R. N.
Partner: UNT Libraries Government Documents Department
open access

Propagation of a Nonrelativistic Electron Beam in a Plasma in a Magnetic Field

Description: Propagation of a nonrelativistic electron beam in a plasma in a strong magnetic field has been studied using electrostatic one-dimensional particle simulation models. Electron beams of finite pulse length and of continuous injection are followed in time to study the effects of beam-plasma interaction on the beam propagation. For the case of pulsed beam propagation, it is found that the beam distribution rapidly spreads in velocity space generating a plateaulike distribution with a high energy t… more
Date: October 1, 1986
Creator: Okuda, H.; Horton, R.; Ono, M. & Ashour-Abdalla, M.
Partner: UNT Libraries Government Documents Department
open access

FSHAKER: a transient control program. [For HP 5451C]

Description: A description is given of FSHAKER, a transient control program for the performance of transient tests, written to run on the HP 5451C (Fourier) system. The report also contains a listing of a demonstration run made with FSHAKER. The appendix contains a commented listing of FSHAKER and listings of three Fortran user programs called by FSHAKER. (RWR)
Date: October 1, 1980
Creator: Cawlfield, J L
Partner: UNT Libraries Government Documents Department
open access

Correlation of physical and genetic maps of human chromosome 16

Description: This project is now progressing strongly. Thirteen somatic cell hybrids containing rearranged {number sign}16 chromosomes have been constructed, bringing the total number of hybrids constructed by the group to 27 which divides chromosome 16 into 29 regions. 170 probes have been mapped into these regions. Although this is the second progress report for this contract it essentially contains all the work carried out since the first progress report covered a period of less than three months during … more
Date: January 1, 1990
Creator: Sutherland, G.R.
Partner: UNT Libraries Government Documents Department
open access

Weldon Spring dose calculations. [Site of former feed materials plant in Missouri]

Description: In response to a request by the Oak Ridge Operations (ORO) Office of the Department of Energy (DOE) for assistance to the Department of the Army (DA) on the decommissioning of the Weldon Spring Chemical Plant, the Health and Safety Research Division of the Oak Ridge National Laboratory (ORNL) performed limited dose assessment calculations for that site. Based upon radiological measurements from a number of soil samples analyzed by ORNL and from previously acquired radiological data for the Weld… more
Date: September 1, 1978
Creator: Dickson, H. W.; Hill, G. S. & Perdue, P. T.
Partner: UNT Libraries Government Documents Department
open access

Strategic plan for scientific computing

Description: Computing technology continues to undergo rapid and dramatic changes. Technological improvements in both hardware and software continue to permit analysts to model problems much more realistically than heretofore practicable. New visualization technologies vastly increase our ability to understand the results of those complex models. The mission of SRS is also undergoing very rapid change as a result of international events. While the typical demands of reactor oriented calculations may decline… more
Date: May 1, 1992
Creator: Church, J.P.
Partner: UNT Libraries Government Documents Department
open access

Defense Waste Processing Facility: Report of task force on options to mitigate the effect of nitrite on DWPF operations

Description: The possibility of accumulating ammonium nitrate (an explosive) as well as organic compounds in the DWPF Chemical Processing Cell Vent System was recently discovered. A task force was therefore organized to examine ways to avoid this potential hazard. Of thirty-two processing/engineering options screened, the task force recommended five options, deemed to have the highest technical certainty, for detailed development and evaluation: Radiolysis of nitrite in the tetraphenylborate precipitate slu… more
Date: March 1, 1992
Creator: Randall, D. (ed.) & Marek, J.C.
Partner: UNT Libraries Government Documents Department
open access

Design, build, develop and test a fieldworthy spiral tool and packer for casing repair

Description: A new method for sealing casing is under research and development by Nu-Bore Systems. The method involves internally lining a section of the wellbore with a multi-layer spiral wrapping of a high strength, corrosion resistant metal interleaved with a high bond strength, resilient epoxy. The high strength metal is preferably a copper based alloy hardened to a very high strength in order to resist the internal and external pressures of downhole environments. The epoxy adhesive formulation is one t… more
Date: January 1, 1993
Creator: Koster, C.
Partner: UNT Libraries Government Documents Department
open access

Silicon crystal under bending

Description: The mechanical behavior of a silicon crystal under bending is investigated. For a crystal of length 30 mm and thickness 3 mm, to achieve the specified bend angle of 0.64 mrad, the appropriate angle of the aluminum punches is 0.96 mrad.
Date: February 11, 1993
Creator: Tang, Z.
Partner: UNT Libraries Government Documents Department
open access

Low severity upgrading of F-T waxes with solid superacids

Description: In the last quarters a new class of solid superacids, including sulfated zirconium-hafnium oxides and ZrO[sub 2]/SO[sub 4] modified by Mn and Fe, were synthesized and shown to be active for isomerization and hydrocracking of hexadecane (n-C[sub 16]H[sub 34]). The reaction was carried out in a tubing bomb under mild conditions: 2.5 MPa and 433 K. Pt/HfO[sub 2]S0[sub 4] catalyst exhibited a low activity for hydrocracking of n-C[sub 16], but the addition of ZrO[sub 2] to the sulfated hafnium impro… more
Date: March 26, 1993
Creator: Tierney, J.W. & Wender, I.
Partner: UNT Libraries Government Documents Department
open access

Publications of the Fossil Energy Advanced Research and Technology Development Materials Program, April 1, 1991--March 31, 1993

Description: Objective of DOE's Fossil Energy Advanced Research and Technology Development Materials Program is to conduct research and development on materials for fossil energy applications, with focus on longer-term needs. The Program includes research aimed at a better understanding of materials behavior in fossil energy environments and on the development of new materials capable of substantial improvement in plant operations and reliability. Scope of the program addresses materials requirements for al… more
Date: January 1, 1993
Creator: Carlson, P.T. (comp.)
Partner: UNT Libraries Government Documents Department
open access

Estimated airborne release of plutonium from the 102 Building at the General Electric Vallecitos Nuclear Center, Vallecitos, California, as a result of damage from severe wind and earthquake hazard

Description: This report estimates the potential airborne releases of plutonium as a consequence of various severities of earthquake and wind hazard postulated for the 102 Building at the General Electric Vallecitos Nuclear Center in California. The releases are based on damage scenarios developed by other specialists. The hazard severities presented range up to a nominal velocity of 230 mph for wind hazard and are in excess of 0.8 g linear acceleration for earthquakes. The consequences of thrust faulting a… more
Date: December 1, 1980
Creator: Mishima, J.; Ayer, J.E. & Hays, I.D.
Partner: UNT Libraries Government Documents Department
open access

INEL BNCT Research Program, March/April 1992

Description: This report presents summaries for two months of current research for the Idaho National Engineering Laboratory (INEL) Boron Neutron Capture Therapy (BNCT) Program. Information is presented on development and murino screening experiments of low-density lipoprotein, carboranyl alanine, and liposome boron containing compounds. Pituitary tumor call culture studies are described. Drug stability, pharmacology and toxicity evaluation of borocaptate sodium (BSH) and boronopheoylalanine (BPA) are descr… more
Date: September 1, 1992
Creator: Venhuizen, J.R.
Partner: UNT Libraries Government Documents Department
open access

[Gas cooled fuel cell systems technology development program]

Description: Objective is the development of a gas-cooled phosphoric acid fuel cell for electric utility power plant application. Primary objectives are to: demonstrate performance endurance in 10-cell stacks at 70 psia, 190 C, and 267 mA/cm[sup 2]; improve cell degradation rate to less than 8 mV/1000 hours; develop cost effective criteria, processes, and design configurations for stack components; design multiple stack unit and a single 100 kW fuel cell stack; design a 375 kW fuel cell module and demonstra… more
Date: March 1, 1988
Partner: UNT Libraries Government Documents Department
open access

Flue gas conditioning for improved particle collection in electrostatic precipitators

Description: It is concluded that the laboratory tests should be conducted at high levels of SO[sub 3] such that the resulting resistivity is in the range of 10[sup 7]--10[sup 8] ohm-cm. There are several reasons leading to this conclusion. At SO[sub 3] concentrations of 30 ppM and greater, the curves for both dew point and resistivity are relatively flat so that changes in gas phase SO[sub 3] will have minimal impact on particle characteristics. In addition, the electrostatic forces are relatively flat in … more
Date: January 15, 1993
Creator: Durham, M. D.
Partner: UNT Libraries Government Documents Department
open access

Lanczos biorthogonalization algorithm and other oblique projection methods for solving large unsymmetric systems

Description: Many powerful methods for solving systems of equations can be regarded as projection methods. Most of the projection methods known for solving linear systems are orthogonal projection methods: but little attention has been given to the class of nonorthogonal (or oblique) projection methods, which is particularly attractive for large nonsymmetric systems. Some methods in the general setting of oblique projection methods are presented, and some theoretical results are given. Some experiments comp… more
Date: December 1, 1980
Creator: Saad, Y.
Partner: UNT Libraries Government Documents Department
open access

Dissipative effects on finite-Larmor-radius modified magnetohydrodynamic ballooning modes

Description: Finite-ion-Larmor-radius (FLR) effects provide a band of additional stability for values of ..beta..(exactly equal to plasma pressure/magnetic pressure) exceeding the limit predicted for ideal magnetohydrodynamic (MHD) ballooning modes. We examine the effect of particle collisions on the stable modes of the FLR modified ideal theory that exist in this range of ..beta.. values.
Date: November 1, 1982
Creator: Connor, J. W.; Chen, L. & Chance, M. S.
Partner: UNT Libraries Government Documents Department
open access

Economic analysis: impact of CS/R process on benzene market

Description: Contract No. DE-AC01-78ET10159 (formerly ET-78-C-01-3117) between UOP/SDC and the United States Department of Energy (DOE) requires UOP/SDC to provide specific engineering and technical services to the DOE Office of Coal Processing in support of the Coal Gasification Program. This report covers an economic study on the projected price of benzene through the next decade based on the market factors and production costs. The impact of the CS/R process on the benzene market was evaluated. In additi… more
Date: May 1, 1981
Creator: Spielberger, L. & Klein, J.
Partner: UNT Libraries Government Documents Department
open access

Thin films of gallium arsenide on low-cost substrates. Final technical report, July 5, 1976-December 5, 1978

Description: The MO-CVD technique was applied to the growth of thin films of GaAs and GaAl As on inexpensive polycrystalline or amorphous substrate materials (primarily glasses and metals) for use in fabrication of large-area low-cost photovoltaic device structures. Trimethylgallium, arsine, and trimethylaluminum are mixed in appropriate concentrations at room temperature in the gaseous state and pyrolyzed at the substrate, which is heated in a vertical reactor chamber to temperatures of 700 to 750/sup 0/C,… more
Date: March 1, 1980
Creator: Ruth, R. P.; Dapkus, P. D.; Dupuis, R. D.; Johnson, R. E.; Moudy, L. A.; Yang, J. J. et al.
Partner: UNT Libraries Government Documents Department
open access

Nuclear radiation analysis for TFTR

Description: A multi-dimensional analysis of the radiation problems was performed for TFTR using the system established at PPPL. Simple, clean geometries were first used to establish the expected reference level. Different calculational models were compared. The characteristics of streaming and activation were then studied. It is shown that the objectives set forth for the TFTR shielding design are not entirely satisfied, based on our calculation. Using the results of this study as a baseline, a review of t… more
Date: September 1, 1980
Creator: Ku, L. P.
Partner: UNT Libraries Government Documents Department
open access

Fast neutron scattering near shell closures: Scandium

Description: Neutron differential elastic- and inelastic-scattering cross sections are measured from [approx] 1.5 to 10 MeV with sufficient detail to define the energy-averaged behavior of the scattering processes. Neutrons corresponding to excitations of 465 [plus minus] 23, 737 [plus minus] 20, 1017 [plus minus] 34, 1251 [plus minus] 20, 1432 [plus minus] 23 and 1692 [plus minus] 25 keV are observed. It is shown that the observables, including the absorption cross section, are reasonably described with a … more
Date: August 1, 1992
Creator: Smith, A. B. & Guenther, P. T.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen