Search Results

open access

Automated real-time testing (ARTT) for embedded control systems (ECS).

Description: Many of today's automated real-time testing systems for embedded systems were developed using expensive custom hardware and software. In this article they describe how to use commercially available off-the-shelf hardware and software to design and develop an automated real-time test systems for Embedded Programmable Logic Controller (PLC) Based Control Systems. The system development began with the implementation of the VALI/TEST Pro testing methodology as a means for structuring the testing. U… more
Date: August 9, 2001
Creator: Hawkins, Jon; Howard, Reginald B. & Nguyen, Haung V.
Partner: UNT Libraries Government Documents Department
open access

The BOUT Project: Validation and Benchmark of BOUT Code and Experimental Diagnostic Tools for Fusion Boundary Turbulence

Description: A boundary plasma turbulence code BOUT is presented. The preliminary encouraging results have been obtained when comparing with probe measurements for a typical Ohmic discharge in CT-7 tokamak. The validation and benchmark of BOUT code and experimental diagnostic tools for fusion boundary plasma turbulence is proposed.
Date: August 9, 2001
Creator: Xu, X Q
Partner: UNT Libraries Government Documents Department
open access

Calcite Precipitation and Trace Metal Partitioning in Groundwater and the Vadose Zone: Remediation of Strontium-90 and Other Divalent Metals and Radionuclides in Arid Western Environments

Description: Radionuclide and metal contaminants are present in the vadose zone and groundwater throughout the U.S. Department of Energy (DOE) weapons complex. Demonstrating in situ immobilization of these contaminants in vadose zones or groundwater plumes is a cost-effective remediation strategy. However, the implementation of in situ remediation requires definition of the mechanism that controls sequestration of the contaminants. One such mechanism for metals and radionuclides is co-precipitation of these… more
Date: August 9, 2001
Creator: Smith, Robert W.; Colwell, F. S.; Ingram, Jani C.; Ferris, F. Grant & Reysenbach, Anna-Louise
Partner: UNT Libraries Government Documents Department
open access

A compact 64-pixel CsI(T1)/Si PIN photodiode imaging module with IC readout

Description: We characterize the performance of a complete 64-pixel compact gamma camera imaging module consisting of optically isolated 3 mm 3 mm 5 mm CsI(Tl) crystals coupled to a custom array of low-noise Si PIN photodiodes read out by a custom IC. At 50 V bias the custom 64-pixel photodiode arrays demonstrate an average leakage current of 28 pA per 3 mm 3 mm pixel, a 98.5 percent yield of pixels with <100 pA leakage, and a quantum efficiency of about 80 percent for 540 nm CsI(Tl) scintillation photons. … more
Date: August 9, 2001
Creator: Gruber, Gregory J.; Choong, Woon-Seng; Moses, William W.; Derenzo, Stephen E.; Holland, Stephen E.; Pedrali-Noy, Marzio et al.
Partner: UNT Libraries Government Documents Department
open access

Computer Modeling of Saltstone Landfills by Intera Environmental Consultants

Description: This report summaries the computer modeling studies and how the results of these studies were used to estimate contaminant releases to the groundwater. These modeling studies were used to improve saltstone landfill designs and are the basis for the current reference design. With the reference landfill design, EPA Drinking Water Standards can be met for all chemicals and radionuclides contained in Savannah River Plant waste salts.
Date: August 9, 2001
Creator: Albenesius, E.L.
Partner: UNT Libraries Government Documents Department
open access

Consequences of return to power after a beam interruption in the blanket of an accelerator driven system.

Description: A sudden drop in power after a beam interruption leads to thermal fatigue effects in structural components in the blanket of an accelerator driven system. These thermal fatigue effects limit component lifetimes. A sudden return to power after a beam interruption can contribute significant additional thermal fatigue and greatly reduce component lifetimes. One obvious solution is a gradual return to power after a beam interruption. There are two potential problems with this solution. One problem … more
Date: August 9, 2001
Creator: Dunn, F.
Partner: UNT Libraries Government Documents Department
open access

Development of a New Shielding Model for JB-Line Dose Rate Calculations

Description: This report describes the shielding model development for the JB-Line Upgrade project. The product of this effort is a simple-to-use but accurate method of estimating the personnel dose expected for various operating conditions on the line. The current techniques for shielding calculations use transport codes such as ANISN which, while accurate for geometries which can be accurately approximated as one dimensional slabs, cylinders or spheres, fall short in calculating configurations in which tw… more
Date: August 9, 2001
Creator: Buckner, M. R.
Partner: UNT Libraries Government Documents Department
open access

Geophysics with applications to subsurface waste disposal: Case history

Description: Recent development in geophysical methods allows us to accurately map the distribution of seismic velocity, density and electrical conductivity beneath the surface and between boreholes. These physical properties are dependent on porosity, fluid saturation, fluid conductivity, pressure, temperature, clay content, and in some circumstances, permeability. Hydrological parameters may be measured or inferred from drill hole experiments or directly from core samples. The point measurements in a dril… more
Date: August 9, 2001
Creator: Lee, K. H.
Partner: UNT Libraries Government Documents Department
open access

Gravitino Warm Dark Matter with Entropy Production

Description: Gravitinos with a mass in the keV range are an interesting candidate for warm dark matter. Recent measurements of the matter density of the universe and of cosmic structures at the dwarf galaxy scale rule out the simplest gravitino models with thermal freeze-out. We construct a model where the decay of the messenger particles that transmit the supersymmetry breaking to the observable sector generates the required entropy to dilute the gravitino relic density by the required factor of a few to c… more
Date: August 9, 2001
Creator: Baltz, Edward A. & Murayama, Hitoshi
Partner: UNT Libraries Government Documents Department
open access

A History of Federal Estate, Gift, and Generation-Skipping Taxes

Description: In this report, the history of the federal transfer taxes, has been divided into four parts: (1) the federal death and gift taxes utilized in the period 1789 to 1915; (2) the development of the modern estate and gift taxes from 1916 through 1975; (3) the creation and refinement of a unified estate and gift tax system, supplemented by a generation-skipping transfer tax; and (4) the phase out and repeal of the estate and generation-skipping taxes, with the gift tax being retained as a device to p… more
Date: August 9, 2001
Creator: Luckey, John R.
Partner: UNT Libraries Government Documents Department
open access

Mass Transit: FTA Could Relieve New Starts Program Funding Constraints

Description: A letter report issued by the General Accounting Office with an abstract that begins "The Federal Transit Administration's (FTA) New Starts program has provided state and local agencies with more than $6 billion in the last eight years to help design and construct transit projects. Although the funding for this program is higher than it has ever been, the demand for these resources is also extremely high. FTA was directed to prioritize projects for funding by evaluating, rating, and recommendin… more
Date: August 9, 2001
Creator: United States. General Accounting Office.
Partner: UNT Libraries Government Documents Department
open access

Microfluidic Sample Preparation for Immunoassays

Description: Researchers at Lawrence Livermore National Laboratory are developing means to collect and identify fluid-based biological pathogens in the forms of proteins, viruses, and bacteria. to support detection instruments, they are developing a flexible fluidic sample preparation unit. The overall goal of this Microfluidic Module is to input a fluid sample, containing background particulates and potentially target compounds, and deliver a processed sample for detection. They are developing techniques f… more
Date: August 9, 2001
Creator: Visuri, S.; Benett, W.; Bettencourt, K.; Chang, J.; Fisher, K.; Hamilton, J. et al.
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: Airline Travel]

Description: B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: August 9, 2001, 4:00 p.m.
Duration: 52 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Partner: UNT Libraries Special Collections
captions transcript

[News Clip: Car seats]

Description: B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: August 9, 2001, 5:00 p.m.
Duration: 1 minute 05 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Partner: UNT Libraries Special Collections
captions transcript

[News Clip: Lucky dog]

Description: B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: August 9, 2001, 5:00 p.m.
Duration: 57 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Partner: UNT Libraries Special Collections
captions transcript

[News Clip: North Dakota storm]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: August 9, 2001, 4:00 p.m.
Duration: 56 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Partner: UNT Libraries Special Collections
open access

On Plasma Rotation Induced by Traveling Fast Alfvin Waves

Description: Absorption of fast Alfven waves by the minority fundamental ion-cyclotron resonance, coupled with finite banana width physics, generates torque distributions and ultimately rotational shear layers in the bulk plasma, even when the toroidal wavenumber k(subscript ''phi'') = n/R of the fast wave vanishes (n=0) and cyclotron absorption introduces no angular momentum nor canonical angular momentum [F.W. Perkins, R.B. White, P.T. Bonoli, and V.S. Chan, Phys. Plasmas 8 (2001) 2181]. The present work … more
Date: August 9, 2001
Creator: Perkins, F. W.; White, R. B. & Chan, V. S.
Partner: UNT Libraries Government Documents Department
open access

A Parallel Two-fluid Code for Global Magnetic Reconnection Studies

Description: This paper describes a new algorithm for the computation of two-dimensional resistive magnetohydrodynamic (MHD) and two-fluid studies of magnetic reconnection in plasmas. It has been implemented on several parallel platforms and shows good scalability up to 32 CPUs for reasonable problem sizes. A fixed, nonuniform rectangular mesh is used to resolve the different spatial scales in the reconnection problem. The resistive MHD version of the code uses an implicit/explicit hybrid method, while the … more
Date: August 9, 2001
Creator: Breslau, J. A. & Jardin, S. C.
Partner: UNT Libraries Government Documents Department
open access

Private Actions to Sue for Civil Rights Violations in Federally Assisted Programs After Alexander v. Sandoval

Description: This report discusses private actions to sue for civil rights violations in federally assisted programs following the Alexander v. Sandoval case. The report discusses the Sandoval decision as well as the implications the case can have in future perils.
Date: August 9, 2001
Partner: UNT Libraries Government Documents Department
open access

Report of Iridium/{sup 238}PuO{sub 2} Compatibility Test

Description: This study indicates that the chemical purity of the fuel used presently to fabricate fueled clad vent sets will not present any special problems to the performance of the fueled clad vent sets as intended. However, cation impurities in the fuel can have a deleterious effect on the iridium cladding and vents and should be minimized as much as practical.
Date: August 9, 2001
Creator: Taylor, D. H.
Partner: UNT Libraries Government Documents Department
open access

Results of High Harmonic Fast Wave Heating Experiments on NSTX

Description: The study of high-harmonic fast-wave (HHFW) heating and current drive is being conducted on the National Spherical Torus Experiment (NSTX) device to determine the physics of applying radio-frequency (rf) waves at high harmonics (approximately 10-20) of the ion cyclotron frequency in this high-beta plasma regime and to extend the performance of the NSTX plasma. The magnetic field of this low aspect ratio device is lower (less than or equal to 0.35 T for this work) than that for the typical moder… more
Date: August 9, 2001
Creator: Hosea, J. C.; Bell, R. E.; Bitter, M.; Bonoli, P.; Carter, M.; Gates, D. et al.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen