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1,824 Matching Results
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Multifragment decay of hot nuclei: Dynamics or statistics
Multifragment events are shown to be associated with specific sources characterized by their mass and excitation energy through the incomplete fusion model. Excitation functions for the different multifragment decay channels are found to be almost independent of the systems and the incident energy. Preliminary comparisons of the data with dynamical calculations followed by statistical decay calculations are discussed. 14 refs., 8 figs.
Date:
June 1, 1991
Creator:
Moretto, L.; Roussel-Chomaz, P.; Blumenfeld, Y.; Charity, R.; Colonna, M.; Colonna, N. et al.
Object Type:
Article
System:
The UNT Digital Library
PAN-DA and beyond: Data acquisition for the next generation experiments
We report on the status of the PAN-DA data acquisition system presented at the last Real Time Conference. Since that time, PAN-DA has been successfully used in the fixed target program at Fermilab. We also report on the plans and strategies for development of a new data acquisition system for the next generation of fixed target experiments at Fermilab. 10 refs., 3 figs.
Date:
June 1, 1991
Creator:
Pordes, R.; Anderson, J.; Berg, D.; Berman, E.; Brown, D.; Dorries, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Transuranic drum hydrogen explosion tests
Radiolysis of transuranic (TRU) waste can produce flammable ({gt}4%) mixtures of hydrogen gas in 55 gallon vented waste storage drums. Explosion testing was conducted at the E. I. duPont Explosion Hazards Laboratory to determine the minimum concentration at which a drum lid removal occurs. A secondary objective was to investigate the maximum pressure and rate of pressure rise as a function of hydrogen concentration. Prior to beginning any drum explosion tests, small-scale pressure vessel tests and drum mixing tests were completed. The pressure vessel tests established a relationship between hydrogen concentration and the maximum pressure and pressure rise. These small-scale tests were used to establish the concentration range over which a drum lid removal might occur. Mixing tests were also conducted to determine the equilibration times for two different hydrogen-air mixtures in a TRU drum. Nine successful drum explosion tests were conducted over a hydrogen concentration range of 13--36% (v/v), test results suggest total integrity failure via drum lid removal will not occur below 15% (v/v). Controlled small-scale pressure vessel tests were conducted over a range of 5--50% (v/v) to determine the pressure and pressure rise as a function of hydrogen concentration. No similar relationship could be established for the …
Date:
June 1, 1991
Creator:
Dykes, K.L. & Meyer, M.L.
Object Type:
Report
System:
The UNT Digital Library
Array analysis of regional Pn and Pg wavefields from the Nevada Test Site
Small-aperture high-frequency seismic arrays with dimensions of a few kilometers or less, can improve our ability to seismically monitor compliance with a low-yield Threshold Test Ban Treaty. This work studies the characteristics and effectiveness of array processing of the regional Pn and Pg wavefields generated by underground nuclear explosions at the Nevada Test Site. Waveform data from the explosion HARDIN (m{sub b} = 5.5) is recorded at a temporary 12-element, 3-component, 1.5 km-aperture array sited in an area of northern Nevada. The explosions VILLE (m{sub b} = 4.4) and SALUT (m{sub b} = 5.5) are recorded at two arrays sited in the Mojave desert, one a 96-element vertical-component 7 km-aperture array and the other a 155-element vertical-component 4 km-aperture array. Among the mean spectra for the m{sub b} = 5.5 events there are significant differences in low-frequency spectral amplitudes between array sites. The spectra become nearly identical beyond about 6 Hz. Spectral ratios are used to examine seismic source properties and the partitioning of energy between Pn and Pg. Frequency-wavenumber analysis at the 12-element array is used to obtain estimates of signal gain, phase velocity, and source azimuth. This analysis reveals frequency-dependent biases in velocity and azimuth of the coherent …
Date:
June 1, 1991
Creator:
Leonard, M.A. (California Univ., Berkeley, CA (United States). Dept. of Geology and Geophysics Lawrence Berkeley Lab., CA (United States))
Object Type:
Report
System:
The UNT Digital Library
A reliability and mass perspective of SP-100 Stirling cycle lunar-base powerplant designs
The purpose was to obtain reliability and mass perspectives on selection of space power system conceptual designs based on SP-100 reactor and Stirling cycle power-generation subsystems. The approach taken was to: (1) develop a criterion for an acceptable overall reliability risk as a function of the expected range of emerging technology subsystem unit reliabilities; (2) conduct reliability and mass analyses for a diverse matrix of 800-kWe lunar-base design configurations employing single and multiple powerplants with both full and partial subsystem redundancy combinations; and (3) derive reliability and mass perspectives on selection of conceptual design configurations that meet an acceptable reliability criterion with the minimum system mass increase relative to reference powerplant design. The developed perspectives provided valuable insight into the considerations required to identify and characterize high-reliability and low-mass lunar-base powerplant conceptual design.
Date:
June 1, 1991
Creator:
Bloomfield, H. S.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Herbet Holl to William McCarter and Jack Davis, June 4, 1991]
Photocopy of a letter from Herbert Holl, executive director of the Greater Denton Arts Council, to William McCarter and Jack Davis, co-directors of North Texas Institute for Educators on the Visual Arts. The letter is in regards to the Arts council continued support for the institutes and awarding $1000.00 towards the program.
Date:
June 4, 1991
Creator:
Holl, Herbert
Object Type:
Letter
System:
The UNT Digital Library
Silver-catalyzed PuO sub 2 dissolution with persulfate
This report consists of 14 slides and associated narrative for a presentation to be given at the 15th Annual Actinide Separations Conference on silver-catalyzed PuO{sub 2} dissolution with persulfate. (JL)
Date:
June 1, 1991
Creator:
Fisher, F D; Barney, G S; Cooper, T D & Duchsherer, M J
Object Type:
Article
System:
The UNT Digital Library
Status of 4-cm-aperture, 17-m-long SSC dipole magnet R D program at BNL
Over the last year-and-a-half, several 4-cm-aperture, 17-m-long dipole magnet prototypes were built by Brookhaven National Laboratory (BNL) under contract with the Superconducting Super Collider (SSC) Laboratory. These prototypes are the last phase of a half-decade-long R D program, carried out in collaboration with Fermi National Accelerator Laboratory and Lawrence Berkeley Laboratory, and aimed at demonstrating the feasibility of the SSC main ring dipole magnets. They also prepare the way of the 5-cm-aperture dipole magnet program to be started soon. In this paper, we analyze the mechanical behavior of the BNL prototypes during cool-down and excitation, and we attempt to relate this behavior to the magnet features. The data reveal that the mechanical behavior is sensitive to the vertical collar-yoke interference, and that the magnets exhibited somewhat erratic changes in coil end-loading during cool-down. 9 refs., 6 figs.
Date:
June 1, 1991
Creator:
Devred, A.; Bush, T.; Coombes, R.; DiMarco, J.; Goodzeit, C.; Kuzminski, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Seismic fragility of nuclear power plant components (Phase 2): A fragility handbook on eighteen components
Fragility estimates of seven equipment classes were published in earlier reports. This report presents fragility analysis results from eleven additional equipment categories. The fragility levels are expressed in probabilistic terms. For users' convenience, this concluding report includes a summary of fragility results of all eighteen equipment classes. A set of conversion factors based on judgment is recommended for use of the information for early vintage equipment. The knowledge gained in conducting the Component Fragility Program and similar other programs is expected to provide a new direction for seismic verification and qualification of equipment. 15 refs., 12 tabs.
Date:
June 1, 1991
Creator:
Bandyopadhyay, K.K.; Hofmayer, C.H.; Kassir, M.K. & Shteyngart, S. (Brookhaven National Lab., Upton, NY (United States))
Object Type:
Report
System:
The UNT Digital Library
EG G sampling program results FY 1989
Thirty-three waste drums were returned to Rocky Flats in support of EG G Idaho's quality control program for the Stored Waste Examination Pilot Plant. The drums were opened and examined in the size reduction facility at the Rocky Flats Plant. Contents of each drum were consistent with the Item Description Codes; however, four sludge drums and one combustible drum contained free liquids. These five drums failed to meet the Waste Isolation Pilot Plant and the Department of Transporation criteria. The proper amount of cement was not used in the sludge drums. A cemented layering process, which also contributed to accumulation of free liquid, is no longer used when cementing sludges at the Rocky Flats Plant. The drum of combustibles contained a polyethylene bottle with a small amount of liquid sludge inside. 2 refs., 2 tabs.
Date:
June 21, 1991
Creator:
Watson, L.E.
Object Type:
Report
System:
The UNT Digital Library
Measurements of ionization balance parameters in atomic ions
This report discusses the measurement of the dielectronic recombination rate of carbon 3 plus ions. (LSP).
Date:
June 1, 1991
Creator:
Kohl, J. L.
Object Type:
Report
System:
The UNT Digital Library
Cluster expansion of fcc Pd-V intermetallics
A cluster expansion is used to compute fcc ground states from first principles for the Pd-V system. Intermetallic structures are not assumed but derived rigorously by minimizing the configurational energy subject to linear constraints. A large number of concentration-independent interactions are calculated by the method of direct configurational averaging. Agreement with the fcc-based portion of the experimentally-determined Pd-V phase diagram is quite satisfactory. 25 refs., 2 figs.
Date:
June 1, 1991
Creator:
de Fontaine, D.; Wolverton, C.; Ceder, G. (Lawrence Berkeley Lab., CA (United States)) & Dreysse, H. (Nancy-1 Univ., 54 (France). Lab. de Physique du Solide)
Object Type:
Article
System:
The UNT Digital Library
Design of the Digital Sky Survey DA and online system---A case history in the use of computer aided tools for data acquisition system design
As part of its expanding Astrophysics program, Fermilab is participating in the Digital Sky Survey (DSS). Fermilab is part of a collaboration involving University of Chicago, Princeton University, and the Institute of Advanced Studies (at Princeton). DSS main results will be a photometric imaging survey and a redshift survey of galaxies and color-selected quasars over {pi} steradians of the Northern Galactic Cap. This paper focuses on our use of Computer Aided Software Engineering (CASE) in specifying the data system for DSS. Extensions to standard'' methodologies were necessary to compensate for tool shortcomings and to improve communication amongst the collaboration members. One such important extension was the incorporation of CASE information into the specification document. 7 refs.
Date:
June 1, 1991
Creator:
Petravick, D.; Berman, E.; Nicinski, T.; Rechenmacher, R.; Oleynik, G.; Pordes, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Three-dimensional magnetic field produced by an axisymmetric iron yoke
A computational procedure, in which separate analyses are performed for conductor and high permeability iron yoke, has been developed for calculating the three-dimensional magnetic field components. Whereas the field components of the isolated 3-D current array can be evaluated at all desired points through the use of a 3-D Biot-Savart law program, we have developed a method for calculating the supplemental field that will arise as a result of the presence of a surrounding high-permeability magnetic yoke with an axially-symmetric bore. We may speak of this supplemental field as an image field'' although we shall realize that is may be possible in general to attribute it only to a distinctly diffuse distribution of image current'' or magnetic moments. The boundary associated with the image field'' is such that at each point along the boundary of the high permeability iron the total scalar potential shall be constant, e.g. V{sup i} = {minus}V{sup d} (where i=image and d=direct). When we describe both potentials as a series of harmonic components'' then the nature of the boundary condition is such that a de-coupling of one harmonic from another is preserved, and therefore it is also true that V{sup i}(n) = {minus}V{sup d}(n) at the …
Date:
June 1, 1991
Creator:
Laslett, L.J.; Caspi, S.; Helm, M. & Brady, V.
Object Type:
Article
System:
The UNT Digital Library
Electricity Use in the Pacific Northwest: Utility Historical Sales by Sector, 1990 and Preceding Years.
This report officially releases the compilation of regional 1990 retail customer sector sales data by the Bonneville Power Administration. The report is intended to enable detailed examination of annual regional electricity consumption. It also provides observations based on statistics covering the 1983--1990 time period, and gives statistics covering the time period 1970--1990. The electricity use report is the only information source that provides data obtained from each utility in the region based on the amount of electricity they sell annually to four sectors. Data is provided on each retail customer sector and also on the customers Bonneville serves directly: residential, commercial, industrial, direct-service industrial, and irrigation. 21 figs., 40 tabs.
Date:
June 1, 1991
Creator:
United States. Bonneville Power Administration.
Object Type:
Report
System:
The UNT Digital Library
Pacific Northwest Laboratory annual report for 1990 to the DOE Office of Energy Research
This report summarizes progress on OHER human health, biological, and general life sciences research programs conducted at PNL in FY 1990. The research develops the knowledge and scientific principles necessary to identify understand, and anticipate the long-term health consequences of energy-related radiation and chemicals. Our continuing emphasis is to decrease the uncertainty of health risk estimates from existing and developing energy-related technologies through an increased of understanding of how radiation and chemicals cause biological damage. The sequence of this report of PNL research reflects the OHER programmatic structure. The first section, on human health research, concerns epidemiological and statistical studies for assessing health risks. The next section contains reports of biological research in laboratory animals and in vitro cell systems, including research with radionuclides and chemicals. The general life sciences research section reports research conducted for the OHER human genome research program.
Date:
June 1, 1991
Creator:
Park, J. F.
Object Type:
Report
System:
The UNT Digital Library
Effective theories and thresholds in particle physics
The role of effective theories in probing a more fundamental underlying theory and in indicating new physics thresholds is discussed, with examples from the standard model and more speculative applications to superstring theory. 38 refs.
Date:
June 7, 1991
Creator:
Gaillard, M. K.
Object Type:
Article
System:
The UNT Digital Library
The University of Minnesota aquifer thermal energy storage (ATES) field test facility -- system description, aquifer characterization, and results of short-term test cycles
Phase 1 of the Aquifer Thermal Energy Storage (ATES) Project at the University of Minnesota was to test the feasibility, and model, the ATES concept at temperatures above 100{degrees}C using a confined aquifer for the storage and recovery of hot water. Phase 1 included design, construction, and operation of a 5-MW thermal input/output field test facility (FTF) for four short-term ATES cycles (8 days each of heat injection, storage, and heat recover). Phase 1 was conducted from May 1980 to December 1983. This report describes the FTF, the Franconia-Ironton-Galesville (FIG) aquifer used for the test, and the four short-term ATES cycles. Heat recovery; operational experience; and thermal, chemical, hydrologic, and geologic effects are all included. The FTF consists of monitoring wells and the source and storage well doublet completed in the FIG aquifer with heat exchangers and a fixed-bed precipitator between the wells of the doublet. The FIG aquifer is highly layered and a really anisotropic. The upper Franconia and Ironton-Galesville parts of the aquifer, those parts screened, have hydraulic conductivities of {approximately}0.6 and {approximately}1.0 m/d, respectively. Primary ions in the ambient ground water are calcium and magnesium bicarbonate. Ambient temperature FIG ground water is saturated with respect to calcium/magnesium …
Date:
June 1, 1991
Creator:
Walton, M.; Hoyer, M. C.; Eisenreich, S. J.; Holm, N. L.; Holm, T. R.; Kanivetsky, R. et al.
Object Type:
Report
System:
The UNT Digital Library
Functional requirements for the Tumulus I and II cap Waste Area Grouping 6 Oak Ridge National Laboratory
The tumulus method of solid low-level waste (LLW) disposal began in 1989 with the Tumulus Disposal Demonstration (TDD) project, conducted on Tumulus I. LLW is contained in 4-ft {times} 4-ft {times} 6-ft boxes which are placed into precast concrete casks. The annular space around the box is grouted with a cementious grout before the lid is installed. The LLW does not contain RCRA materials or liquids. The casks are then stacked two high on the concrete tumulus pad. Prior to filling Tumulus I to capacity Tumulus II was constructed. Tumulus II will be filled to capacity by the end of 1991 at which time the Interim Waste Management Facility (IWMF) will have been constructed and will provide approximately six years of LLW disposal capacity. This project will provide interim closure of the Tumulus I and II by designing and constructing a multilayered cap, with monitoring capabilities, which will be consistent in purpose with the requirements of a Record of Decision (ROD) which will result from the Waste Area Group (WAG) 6 closure and remediation effort. Capping Tumulus I and II has been a part of the overall tumulus disposal plan since inception in the Low Level Waste Disposal, Development and …
Date:
June 1, 1991
Creator:
Cox, L.C.
Object Type:
Report
System:
The UNT Digital Library
Water-table elevations on the Hanford Site, 1990
The Pacific Northwest Laboratory prepared water-table maps of the US Department of Energy's Hanford Site for June 1990 from water-level elevations measured in 224 wells across the Hanford Site. The greatest changes in the elevation of the water table at Hanford occurred beneath the decommissioned U Pond, 200-East Area, the 100-N Area, the 1100 and 3000 Areas, and near the Columbia River. The elevation of the ground-water mound beneath the decommissioned U Pond continued to decline, decreasing as much as 0.8 m (2.6 ft) between December 1989 and December 1990. This decline has been observed in wells in much of the adjacent 200-West Area and is primarily the result of continued dissipation of the ground-water mound beneath U Pond since it was deactivated in 1984. 21 refs., 12 figs.
Date:
June 1, 1991
Creator:
Newcomer, D R; Pohlod, K D & McDonald, J P
Object Type:
Report
System:
The UNT Digital Library
SLC positron source pulsed flux concentrator
SLC positron beams produced by a high energy electron beam, impinging on a high Z target, have initially small transverse size but large divergence, a situation ill matched to the following S-band accelerator. The flux concentrator is an adiabatic matching device placed between the target and this accelerator, which trades divergence versus size. It produces a magnetic field with a sharp rise over less than 5 mm to its peak value, and then falling off adiabatically over 10 cm. It is a 12 turn, 10 cm long copper coil with a cylindrical outside radius of 4 cm and a conical inside radius growing from 3.5 mm to 2.6 cm. The 0.2 mm gaps between the individual windings were manufactured by electric discharge machining out of one copper block. Excitation current and water cooling is provided by a hollow rectangular copper conductor brazed to the outside of the coil (also 12 turns). The pulsed magnetic field has a maximum strength of 58 kG at 16 kA. At the terminals, the coil has an inductance of 0.8 {mu}H. Current shape is a half sinusoidal wave with a bottom width of 5 {mu}s, and the system operates at a repetition rate of 120 …
Date:
June 1, 1991
Creator:
Kulikov, A.V.; Ecklund, S.D. & Reuter, E.M.
Object Type:
Article
System:
The UNT Digital Library
Beamstrahlung simulation and diagnostics
A simulation code that models the mutual deflection and the emission of beamstrahlung of two ultra-relativistic electron and positron bunches is described. The simulations are used to determine transverse beam sizes from observed beamstrahlung fluxes. 8 refs., 3 figs.
Date:
June 1, 1991
Creator:
Ziemann, V.
Object Type:
Article
System:
The UNT Digital Library
Some design considerations for pbar target sweeping station
This report summarizes the results of some recent calculations useful to design the beam sweeping station to produce high intensity pbar beam at AP0. With various on-going and planned intensity upgrade at the accelerator including the main injector the primary beam intensity on the pbar target is expected to increase. But some complications would arise from the existing method of pbar production. A study of the heavy metal targets used when the beam intensity was about 1.0 {times} 10{sup 12}, has shown a clear indication of target destruction by the proton beam. Although the heavy metal has very high melting point temperature the thermoelastic property is not suitable for its use as a reliable pbar target. During 1989 collider run, the target material was changed over to copper because of its better thermoelastic properties. The pbar yield measurement did not show much indications of target destruction except for a small decrease in the pbar yield. However, the calculations showed that the target material along the beam might have had enough energy deposition to transform the target material from the solid state to the liquid state during the beam spill time. A further increase of the proton beam intensity might cause …
Date:
June 1, 1991
Creator:
Bhat, C.M.
Object Type:
Report
System:
The UNT Digital Library
Uniform remote control of front end processors in PAN-DA
The PAN-DA data acquisition software system encompasses support for a variety of front end processors including the Struck General Purpose Master (GPM), the Fermilab Smart Crate Controller (FSCC), and the Motorola MVME133-A VME single board computer. PAN-DA provides support for the remote control of these processors through its Remote Procedure eXecution (RPX) software. This software runs over serial lines, and in some PAN-DA environments, over the Ethernet and TCP/IP as well. Experiments E791 and E771 have successfully used RPX software in both FSCC software development and data collection during the 1990--1991 fixed target run at Fermilab. RPX software has facilitated development and testing of the Fermilab Silicon Strip Detector readout system, for which the FSCC is an integral component. RPX based control and monitoring of the GPM and the MVME133-A are essential parts of the PAN-DA data acquisition system used by E687 and E773 during the 1990--1991 run. 6 refs., 2 figs.
Date:
June 1, 1991
Creator:
Berg, D.; Berman, E.; MacKinnon, B.; Nicinski, T.; Oleynik, G.; Petravick, D. et al.
Object Type:
Article
System:
The UNT Digital Library