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640 Matching Results
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2D numerical simulation of the resistive reconnection layer
In this paper the authors present a two-dimensional numerical simulation of a reconnection current layer in incompressible resistive magnetohydrodynamics with uniform resistivity in the limit of very large Lundquist numbers. They use realistic boundary conditions derived consistently from the outside magnetic field, and they also take into account the effect of the backpressure from flow into the separatrix region. They find that within a few Alfven times the system reaches a steady state consistent with the Sweet-Parker model, even if the initial state is Petschek-like.
Date:
July 21, 2000
Creator:
Uzdensky, D. A. & Kulsrud, R. M.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 101, No. 113, Ed. 1 Friday, July 21, 2000
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 21, 2000
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Analysis of the November 1999 Dead Sea Calibration Shots
In November 1999 three chemical explosions were conducted in the Dead Sea for the purposes of calibrating the International Monitoring System (IMS) for the Comprehensive Nuclear-Test-Ban Treaty (CTBT). These shots were organized and conducted by the Geophysical Institute of Israel (GII). Large chemical explosions are the most valuable form of ground truth as the location, depth and origin time are very well known. We focus on the two largest shots (M{sub w} {ge} 3.6) and performed several types of analysis of the regional recordings and travel times of these shots. These data provide valuable new information about the region and offer an opportunity to test monitoring strategies. A crustal and uppermost mantle velocity model was inferred from the travel times of the regional phases: Pn, Pg and Sg. This effort utilized a grid search method to find suitable models of the structure. Results indicate that the crust is relatively thin (32 km) with lower than average crustal velocities (mean V{sub P} = 6.1-6.2 km/s). We located each shot treating the other shot as a calibration explosion. Locations were computed using both station static corrections and kriged correction surfaces. Results show that the locations with static corrections can be better or …
Date:
July 21, 2000
Creator:
Rodgers, A J; Myers, S; Mayeda, K & Walter, W
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 238, Ed. 1 Friday, July 21, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
July 21, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 95, No. 58, Ed. 1 Friday, July 21, 2000
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
July 21, 2000
Creator:
Keasling, Edna & Fierro, Jennifer
Object Type:
Newspaper
System:
The Portal to Texas History
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Friday, July 21, 2000
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
July 21, 2000
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History
China and the WTO: Labor Issues
This report discusses China's prospective membership in the World Trade Organization (WTO) and the issues it raises for U.S. workers and organized labor.
Date:
July 21, 2000
Creator:
Bolle, Mary Jane
Object Type:
Report
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 105, No. 58, Ed. 1 Friday, July 21, 2000
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
July 21, 2000
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Dallas Voice (Dallas, Tex.), Vol. 17, No. 12, Ed. 1 Friday, July 21, 2000
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
July 21, 2000
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
Data Qualification Report: Compostion of J-13 Well Water for Use on the Yucca Mountain Project
The data evaluated in this qualification report have been cited in analysis and model reports (AMRs) in support of the Site Recommendation in determining the suitability of the Yucca Mountain Site for a repository for high level nuclear waste. The AMRs use these hydrochemical data as a basis for modeling the chemical interactions between groundwater and engineered materials, including waste forms, packages and materials in the engineered barrier system J-13 water is also used as a reactant in experiments performed to collect data on corrosion of waste packages and repository materials, on solubility of radionuclides, on waste form leach rates, and in simulations of the mobility of radionuclides in groundwater, among other applications. J-13 water serves effectively as a reference or surrogate water composition across the program. Establishing a qualified data set describing the composition of J-13 will help ensure commonality among the various studies.
Date:
July 21, 2000
Creator:
Steinborn, T.L.
Object Type:
Report
System:
The UNT Digital Library
Delta Coherence Protocols: The Home Update Protocol
We describe a new class of directory coherence protocols called delta coherence protocols that use network guarantees to support a new and highly concurrent approach to maintain a consistent shared memory. Delta coherence protocols are more concurrent than other coherence protocols in that they allow processes to pipeline memory accesses without violating sequential consistency; support multiple concurrent readers and writers to the same cache block; and allow processes to access multiple shared variables atomically without invalidating the copies held by other processes or otherwise obtaining exclusive access to the referenced variables. Delta protocols include both update and invalidate protocols. In this paper we describe the simplest, most basic delta protocol, an update protocol called the home update protocol. Delta protocols are based on isotach network guarantees. An isotach network maintains a logical time system that allows each process to predict and control the logical time at which its messages are received. Processes use isotach guarantees to control the logical time at which their requests on shared memory appear to be executed. We prove the home update protocol is correct using logical time to reason about the order in which requests are executed.
Date:
July 21, 2000
Creator:
Williams, C.; Reynolds, P.F. & de Supinoki, B.
Object Type:
Report
System:
The UNT Digital Library
DEVELOPMENT OF HIGH ACTIVITY, COAL-DERIVED, PROMOTED CATALYTIC SYSTEMS FOR NOx REDUCTION AT LOW TEMPERATURES
This project is directed at an investigation of catalytic NO{sub x} reduction mechanisms on coal-derived, activated carbon supports at low temperatures. Promoted carbon systems offer some potentially significant advantages for heterogeneous NO{sub x} reduction. These include: low cost; high activity at low temperatures, which minimizes carbon loss; oxygen resistance; and a support material which can be engineered with respect to porosity, transport and catalyst dispersion characteristics. During the reporting period, the following has been accomplished: (1) Steady-state reactivity studies in the packed bed reactor were extended to the NO/CO-carbon reaction system as a function of temperature and NO and CO concentrations. It was found that the NO reaction rate increased in the presence of CO, and the apparent activation energy decreased to about 75 {+-} 8 kJ/mol. In addition, the influence of mass transfer limitations were noted at low NO and CO concentrations. (2) The packed bed reactor/gas flow system has been applied to performing post-reaction temperature programmed desorption (TPD) studies of intermediate surface complexes following steady-state reaction. It was found that the amount of CO-evolving intermediate surface complexes exceeded that of the N{sub 2}-evolving surface complexes, and that both increased with reaction temperature. The TPD spectra indicates that both …
Date:
July 21, 2000
Creator:
Calo, Joseph M.
Object Type:
Report
System:
The UNT Digital Library
Earth and Environmental Sciences 1999 Annual Report Meeting National Needs
Lawrence Livermore National Laboratory's Earth and Environmental Sciences 1999 Annual Report covers the following topics: (1) Nuclear Materials--Modeling Thermohydrologic Processes at the Proposed Yucca Mountain Nuclear-Waste Repository; Dose Assessments and Resettlement Support on Rongelap Atoll in the Marshall Islands. (2) Climate, Carbon, and Energy--Incorporating Surprise into Models of Global Climate Change: A Simple Climate Demonstrator Model; (3) Environmental Risk Reduction--The NASA Global Modeling Initiative: Analyzing the Atmospheric Impacts of Supersonic Aircraft; (4) National Security--Atmospheric Release Assessment Programs; and (5) Cross-Cutting Technologies/Capabilities--Advances in Technology at the Center for Accelerator Mass Spectrometry; Experimental Geophysics: Investigating Material Properties at Extreme Conditions.
Date:
July 21, 2000
Creator:
Yonker, L. & Dannevik, B.
Object Type:
Report
System:
The UNT Digital Library
Enrico Fermi Fast Reactor Spent Nuclear Fuel Criticality Calculations: Degraded Mode
The objective of this calculation is to characterize the nuclear criticality safety concerns associated with the codisposal of the Department of Energy's (DOE) Enrico Fermi (EF) Spent Nuclear Fuel (SNF) in a 5-Defense High-Level Waste (5-DHLW) Waste Package (WP) and placed in a Monitored Geologic Repository (MGR). The scope of this calculation is limited to the determination of the effective neutron multiplication factor (k{sub eff}) for the degraded mode internal configurations of the codisposal WP. The results of this calculation and those of Ref. 8 will be used to evaluate criticality issues and support the analysis that will be performed to demonstrate the viability of the codisposal concept for the Monitored Geologic Repository.
Date:
July 21, 2000
Creator:
Moscalu, D.R.; Angers, L.; Monroe-Rammsey, J. & Radulesca, H.R.
Object Type:
Report
System:
The UNT Digital Library
Estimate of external background radiation interference on a tomography scanner
We have estimated interference from external background radiation for a computed tomography (CT) scanner. Our intention is to estimate the interference that would be expected for the high-resolution SkyScan 1072 desk-top x-ray microtomography system. The SkyScan system uses a Microfocus x-ray source capable of a 10-{micro}m focal spot at a maximum current of 0.1 mA and a maximum energy of 130 kVp. All predictions made in this report assume using the x-ray source at the smallest spot size, maximum energy, and operating at the maximum current. Some of the systems basic geometry that is used for these estimates are: (1) Source-to-detector distance: 250 mm, (2) Minimum object-to-detector distance: 40 mm, and (3) Maximum object-to-detector distance: 230 mm. This is a first-order, rough estimate of the quantity of interference expected at the system detector caused by background radiation. The amount of interference is expressed by using the ratio of exposure expected at the detector of the CT system. The exposure values for the SkyScan system are determined by scaling the measured values of an x-ray source and the background radiation adjusting for the difference in source-to-detector distance and current. The x-ray source that was used for these measurements was not the …
Date:
July 21, 2000
Creator:
Roberson, G P & Logan, C M
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Friday, July 21, 2000
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 21, 2000
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Financial Management: Improvements Needed in NIH's Controls Over Royalty Income
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO provided information on the deficiencies in the National Institutes of Health (NIH) internal controls over royalty income that is distributed to institutes and inventors."
Date:
July 21, 2000
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
[Funeral Program for Gladys Elizabeth Stewart Houston, July 21, 2000]
Funeral program for Gladys Elizabeth Stewart Houston, born December 28, 1916 and died June 15, 2000. The funeral was held July 21, 2000 at Second Baptist Church, officiated by Reverend Robert Jemerson.
Date:
July 21, 2000
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
[Funeral Program for Warren D. Hubert, Sr., July 21, 2000]
Funeral program for Msgt. (Retired) Warren D. Hubert, Sr., born March 15, 1932. The funeral was held Friday, July 21, 2000 at Jacobs Chapel United Methodist Church, officiated by Reverend Howard E. Mims, Pastor. Funeral arrangements were made through Sutton-Sutton Mortuary, Inc. and he was buried in Fort Sam Houston National Cemetery near San Antonio, Texas.
Date:
July 21, 2000
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
Grandview Tribune (Grandview, Tex.), Vol. 105, No. 47, Ed. 1 Friday, July 21, 2000
Weekly newspaper from Grandview, Texas that includes local, state, and national news along with advertising.
Date:
July 21, 2000
Creator:
Bosher, Casey & Marten, Donna K.
Object Type:
Newspaper
System:
The Portal to Texas History
High heat-load absorbers for the APS storage ring
The power density of the dipole x-rays in the 7-GeV APS storage ring is 261 watts/mrad at 300 mA of beam current. An array of absorbers is used in the ring to shield its vacuum chambers and diagnostics components in the path of these intense x-rays. This paper describes some of the unique absorber designs that were developed to handle the requirements of high power density and UHV compatibility with no water-to-vacuum joints.
Date:
July 21, 2000
Creator:
Sharma, S.; Rotela, E. & Barcikowski, A.
Object Type:
Article
System:
The UNT Digital Library
The Hopkins County Echo (Sulphur Springs, Tex.), Vol. 205, No. 25, Ed. 1 Friday, July 21, 2000
Weekly newspaper from Sulphur Springs, Texas that includes local, state, and national news along with advertising.
Date:
July 21, 2000
Creator:
Keys, Scott & Lamb, Bill
Object Type:
Newspaper
System:
The Portal to Texas History
Hudspeth County Herald and Dell Valley Review (Dell City, Tex.), Vol. 43, No. 46, Ed. 1 Friday, July 21, 2000
Weekly newspaper from Dell City, Texas that includes local, state, and national news along with advertising.
Date:
July 21, 2000
Creator:
Lynch, Mary Louise
Object Type:
Newspaper
System:
The Portal to Texas History
LLNL Operation/Building Screening Report for Initial Hazard Classification Building 518/518A
None
Date:
July 21, 2000
Creator:
Mathews, C. E.
Object Type:
Report
System:
The UNT Digital Library