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Altus Times (Altus, Okla.), Vol. 101, No. 240, Ed. 1 Monday, December 18, 2000
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 18, 2000
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Sun (Alvin, Tex.), Vol. 109, No. 102, Ed. 1 Monday, December 18, 2000
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
December 18, 2000
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 22, Ed. 1 Monday, December 18, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 18, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Brookhaven National Laboratory Source Water Assessment for Drinking Water Supply Wells
The BNL water supply system meets all water quality standards and has sufficient pumping and storage capacity to meet current and anticipated future operational demands. Because BNL's water supply is drawn from the shallow Upper Glacial aquifer, BNL's source water is susceptible to contamination. The quality of the water supply is being protected through (1) a comprehensive program of engineered and operational controls of existing aquifer contamination and potential sources of new contamination, (2) groundwater monitoring, and (3) potable water treatment. The BNL Source Water Assessment found that the source water for BNL's Western Well Field (comprised of Supply Wells 4, 6, and 7) has relatively few threats of contamination and identified potential sources are already being carefully managed. The source water for BNL's Eastern Well Field (comprised of Supply Wells 10, 11, and 12) has a moderate number of threats to water quality, primarily from several existing volatile organic compound and tritium plumes. The g-2 Tritium Plume and portions of the Operable Unit III VOC plume fall within the delineated source water area for the Eastern Well Field. In addition, portions of the much slower migrating strontium-90 plumes associated with the Brookhaven Graphite Research Reactor, Waste Concentration Facility and …
Date:
December 18, 2000
Creator:
Bennett, D. B.; Paquette, D. E.; Klaus, K. & Dorsch, W. R.
Object Type:
Report
System:
The UNT Digital Library
BROOKHAVEN NATIONAL LABORATORY SOURCE WATER ASSESSMENT FOR DRINKING WATER SUPPLY WELLS
The BNL water supply system meets all water quality standards and has sufficient pumping and storage capacity to meet current and anticipated future operational demands. Because BNL's water supply is drawn from the shallow Upper Glacial aquifer, BNL's source water is susceptible to contamination. The quality of the water supply is being protected through (1) a comprehensive program of engineered and operational controls of existing aquifer contamination and potential sources of new contamination, (2) groundwater monitoring, and (3) potable water treatment. The BNL Source Water Assessment found that the source water for BNL's Western Well Field (comprised of Supply Wells 4, 6, and 7) has relatively few threats of contamination and identified potential sources are already being carefully managed. The source water for BNL's Eastern Well Field (comprised of Supply Wells 10, 11, and 12) has a moderate number of threats to water quality, primarily from several existing volatile organic compound and tritium plumes. The g-2 Tritium Plume and portions of the Operable Unit III VOC plume fall within the delineated source water area for the Eastern Well Field. In addition, portions of the much slower migrating strontium-90 plumes associated with the Brookhaven Graphite Research Reactor, Waste Concentration Facility and …
Date:
December 18, 2000
Creator:
Bennett, D. B.; Paquette, D. E.; Klaus, K. & Dorsch, W. R.
Object Type:
Report
System:
The UNT Digital Library
Calcium-Dependent Conformation of a Heme and Fingerprint Peptide of the Di-Heme Cytochrome c Peroxidase from Paracoccus Pantotrophus
The structural changes in the heme macrocycle and substituents caused by binding of Ca{sup 2+} to the diheme cytochrome c peroxidase from Paracoccuspantotrophus were clarified by resonance Raman spectroscopy of the inactive filly oxidized form of the enzyme. The changes in the macrocycle vibrational modes are consistent with a Ca{sup 2+}-dependent increase in the out-of-plane distortion of the low-potential heme, the proposed peroxidatic heme. Most of the increase in out-of-plane distortion occurs when the high affinity site I is occupied, but a small further increase in distortion occurs when site II is also occupied by Ca{sup 2+}or Mg{sup 2+}. This increase in the heme distortion also explains the red shift in the Soret absorption band that occurs upon Ca{sup 2+} binding. Changes also occur in the low frequency substituent modes of the heme, indicating that a structural change in the covalently attached fingerprint pentapeptide of the LP heme occurs upon CM{sup 2+} binding to site I. These structural changes, possibly enhanced in the semi-reduced form of the enzyme, may lead to loss of the sixth ligand at the peroxidatic heme and activation of the enzyme.
Date:
December 18, 2000
Creator:
Pauleta, Sofia R.; Lu, Yi; Goodhew, Celia F.; Moura, Isabel; Pettigrew, Graham W. & Shelnutt, John A.
Object Type:
Article
System:
The UNT Digital Library
Configuration Management Plan for Long Length Contaminated Equipment Receiver and Transport Trailers
Long Length Contaminated Equipment Removal System Receiver Trailers and Transport Trailers require identification and control for the design, requirements and operations baseline documents. This plan serves as those controls for the subject trailers.
Date:
December 18, 2000
Creator:
DALE, R.N.
Object Type:
Report
System:
The UNT Digital Library
Daily Journal (Perry, Okla.), Vol. 107, No. 247, Ed. 1 Monday, December 18, 2000
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 18, 2000
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Decontamination of U-metal Surface by an Oxidation Etching System
A surface oxidation treatment is described to remove surface contamination from uranium (U) metal and/or hydrides of uranium and heavy metals (HM) from U-metal parts. In the case of heavy metal atomic contamination on a surface, and potentially several atomic layers beneath, the surface oxidation treatment combines both chemical and chemically driven mechanical processes. The chemical process is a controlled temperature-time oxidization process that creates a thin film of uranium oxide (UO{sub 2} and higher oxides) on the U-metal surface. The chemically driven mechanical process is strain induced by the volume increase as the U-metal surface transforms to a UO{sub 2} surface film. These volume strains are sufficiently large to cause surface failure spalling/scale formation and thus, removal of a U-oxide film that contains the HM-contaminated surface. The case of a HM-hydride surface contamination layer can be treated similarly by using inert hot gas to decompose the U-hydrides and/or HM-hydrides that are contiguous with the surface. A preliminary analysis to design and to plan for a sequence of tests is developed. The tests will provide necessary and sufficient data to evaluate the effective implementation and operational characteristics of a safe and reliable system. The following description is limited to only …
Date:
December 18, 2000
Creator:
Stout, R B; Kansa, E J; Shaffer, R J & Weed, H C
Object Type:
Article
System:
The UNT Digital Library
The Effect of Surface Contamination on Adhesive Forces as Measured by Contact Mechanics
The contact adhesive forces between two surfaces, one being a soft hemisphere and the other being a hard plate, can readily be determined by applying an external compressive load to mate the two surfaces and subsequently applying a tensile load to peel the surfaces apart. The contact region is assumed the superposition of elastic Hertzian pressure and of the attractive surface forces that act only over the contact area. What are the effects of the degree of surface contamination on adhesive forces? Clean aluminum surfaces were coated with hexadecane as a controlled contaminant. The force required to pull an elastomeric hemisphere from a surface was determined by contact mechanics, via the JKR model, using a model siloxane network for the elastomeric contact sphere. Due to the dispersive nature of the elastomer surface, larger forces were required to pull the sphere from a contaminated surface than a clean aluminum oxide surface.
Date:
December 18, 2000
Creator:
Emerson, John A.; Giunta, Rachel K.; Miller, Gregory V.; Sorensen, Christopher R. & Pearson, Raymond A.
Object Type:
Article
System:
The UNT Digital Library
Effective determination of coexistence curves using reversible-scaling molecular dynamics simulations
We present a simulation technique that allows the calculation of a phase coexistence curve from a single nonequilibrium molecular dynamics (MD) simulation. The approach is based on the simultaneous simulation of two coexisting phases, each in its own computational cell, and the integration of the relevant Clausius-Clapeyron equation starting from a known coexistence point. As an illustration of the effectiveness of our approach we apply the method to explore the melting curve in the Lennard-Jones phase diagram.
Date:
December 18, 2000
Creator:
de Koning, M; Antonelli, A & Yip, S
Object Type:
Article
System:
The UNT Digital Library
Elevated Temperature Creep Properties of Conventional 50Au-50Cu and 47Au 50Cu-3Ni Braze Alloys
The elevated temperature creep properties of the 50Au-50Cu wt% and 47Au-50Cu-3Ni braze alloys have been evaluated over the temperature range 250-850 C. At elevated temperatures, i.e., 450-850 C, both alloys were tested in the annealed condition (2 hrs. 750 C/water quenched). The minimum strain rate properties over this temperature range are well fit by the Garofalo sinh equation. At lower temperatures (250 and 350 C), power law equations were found to characterize the data for both alloys. For samples held long periods of time at 375 C (96 hrs.) and slowly cooled to room temperature, an ordering reaction was observed. For the case of the 50Au-50Cu braze alloy, the stress necessary to reach the same, strain rate increased by about 15% above the baseline data. The limited data for ordered 47Au-50Cu-3Ni alloy reflected a,smaller strength increase. However, the sluggishness of this ordering reaction in both alloys does not appear to pose a problem for braze joints cooled at reasonable rates following brazing.
Date:
December 18, 2000
Creator:
STEPHENS JR.,JOHN J. & SCHMALE,DAVID T.
Object Type:
Article
System:
The UNT Digital Library
Evaluation of Proposed New LLW Disposal Activity Disposal of Compacted Job Control Waste, Non-compactible, Non-incinerable Waste, And Other Wasteforms In Slit Trenches
Following issuance of the original document (i.e., rev. 0), it was decided to change the terminology for the calculated average concentrations derived from the inventory limit and the volumetric capacity of the unit. In the original document, the concentration values were termed ''limits''. This terminology proved problematic in managing the inventory limits through the deviation process. Thus, these values are now termed ''concentration guidelines''. Since the average concentration values presented in the UDQ serve no essential purpose, they were removed from the table. It was also decided to delete the table of materials acceptable for trench disposal (Table 2 of the original document). This table was only envisioned to be a listing of example materials. The intent of the PA, as well as the UDQ, is that any material, except for activated metal, meeting the trench WAC is acceptable.
Date:
December 18, 2000
Creator:
WILHITE, ELMERL.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Proposed New LLW Disposal Activity Disposal of LLW in an Engineered Trench rather than in Slit Trenches
Following issuance of the original document (i.e., rev. 0), it was discovered that an error was made in stating the dimensions and volume of the Engineered Trench and the incorrect volume was used in calculating the concentration limits (i.e. the inventory limit divided by the volumetric waste capacity of the unit) in the tables. The terminology of calling the average concentrations ''limits'' proved problematic in managing the inventory limits through the deviation process. Since the average concentration values presented serve no essential purpose (Waste Acceptance Criteria are derived from the inventory limits), they were removed from the tables. Also, the name of the disposal unit was changed from the MegaTrench to the Engineered Trench. For clarification, a statement was added that differences in dimensions of disposal units of less than about 10 percent are inconsequential from a PA perspective.
Date:
December 18, 2000
Creator:
WILHITE, ELMERL.
Object Type:
Report
System:
The UNT Digital Library
Export Controls: System for Controlling Exports of High Performance Computing Is Ineffective
A letter report issued by the General Accounting Office with an abstract that begins "The U.S. government controls the export of high performance computers to sensitive destinations on the basis of foreign policy and national security concerns. The current control system for high performance computers is ineffective because it focuses on controlling individual machines and cannot prevent countries of concern from linking or clustering many lower performance uncontrolled computers to collectively perform at higher levels than current export control allows. The current system uses the measure of millions of theoretical operations per second as a way to classify and control high power computers meant for export. However, this system, as well as three remedies suggested by the Department of Commerce, do not solve the problems posed by clustering."
Date:
December 18, 2000
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, December 18, 2000
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 18, 2000
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Failure Surface Analysis of Polyimide/Titanium Notched Coating Adhesion Specimens
Adhesively bonded joints of LaRC{trademark} PETI-5, a phenylethynyl-terminated polyimide, with chromic acid anodized titanium were fabricated and debonded interfacially. The adhesive-substrate failure surfaces were investigated using several surface analysis techniques. From Auger spectroscopy, field emission scanning electron microscopy, and atomic force microscopy studies, polymer appears to be penetrating the pores of the anodized substrate to a depth of approximately 100 nm. From x-ray photoelectron spectroscopy data, the polymer penetrating the pores appears to be in electrical contact with the titanium substrate, leading to differential charging. These analyses confirm that the polymer is becoming mechanically interlocked within the substrate surface.
Date:
December 18, 2000
Creator:
Giunta, Rachel Knudsen & Kander, Ronald G.
Object Type:
Article
System:
The UNT Digital Library
Final Report [Function of the Arabidopsis TIR1 gene in auxin response]
During this grant period substantial progress was made in the characterization of the TIR1 gene in Arabidopsis. Studies showed that the TIR1 protein is part of a protein complex that includes AtCUL1, ASK1 and RBX1. This complex, called SCF-TIR1, functions in the ubiquitin-mediated protein degradation pathway. Our work is the first report of an SCF complex in a plant system. The results of our studies are described in more detail in the report together with a publication resulting from this study.
Date:
December 18, 2000
Creator:
Estelle, Mark
Object Type:
Report
System:
The UNT Digital Library
Mechanisms to Explain Damage Growth in Optical Materials
Damage growth in optical materials used in large aperture laser systems is an issue of great importance when determining component lifetime and therefore cost of operation. Understanding the mechanisms and photophysical processes associated with damage growth are important in order to devise mitigation techniques. In this work we examined plasma-modified material and cracks for their correlation to damage growth on fused silica and DKDP samples. We employ an in-situ damage testing optical microscope that allows the acquisition of light scattering and fluorescence images of the area of interest prior to, and following exposure to a high fluence, 355-nm, 3-ns laser pulse. In addition, high-resolution images of the damage event are recorded using the associated plasma emission. Experimental results indicate that both aforementioned features can initiate plasma formation at fluences as low as 2 J/cm{sup 2}. The intensity of the recorded plasma emission remains low for fluences up to approximately 5 J/cm{sup 2} but rapidly increases thereafter. Based on the experimental results, we propose as possible mechanisms leading to damage growth the initiation of avalanche ionization by defects at the damage modified material and presence of field intensification due to cracks.
Date:
December 18, 2000
Creator:
Demos, S G; Kozlowski, M R; Staggs, M; Chase, L L; Burnham, A & Radousky, H B
Object Type:
Article
System:
The UNT Digital Library
Monitoring Dielectric Thin-Film Production on Product Wafers Using Infrared Emission Spectroscopy
Monitoring of dielectric thin-film production in the microelectronics industry is generally accomplished by depositing a representative film on a monitor wafer and determining the film properties off line. One of the most important dielectric thin films in the manufacture of integrated circuits is borophosphosilicate glass (BPSG). The critical properties of BPSG thin films are the boron content, phosphorus content and film thickness. We have completed an experimental study that demonstrates that infrared emission spectroscopy coupled with multivariate analysis can be used to simultaneous y determine these properties directly from the spectra of product wafers, thus eliminating the need of producing monitor wafers. In addition, infrared emission data can be used to simultaneously determine the film temperature, which is an important film production parameter. The infrared data required to make these determinations can be collected on a time scale that is much faster than the film deposition time, hence infrared emission is an ideal candidate for an in-situ process monitor for dielectric thin-film production.
Date:
December 18, 2000
Creator:
NIEMCZYK,THOMAS M.; ZHANG,SONGBIAO & HAALAND,DAVID M.
Object Type:
Article
System:
The UNT Digital Library
Negative Ion Density Fronts
Negative ions tend to stratify in electronegative plasmas with hot electrons (electron temperature Te much larger than ion temperature Ti, Te > Ti ). The boundary separating a plasma containing negative ions, and a plasma, without negative ions, is usually thin, so that the negative ion density falls rapidly to zero-forming a negative ion density front. We review theoretical, experimental and numerical results giving the spatio-temporal evolution of negative ion density fronts during plasma ignition, the steady state, and extinction (afterglow). During plasma ignition, negative ion fronts are the result of the break of smooth plasma density profiles during nonlinear convection. In a steady-state plasma, the fronts are boundary layers with steepening of ion density profiles due to nonlinear convection also. But during plasma extinction, the ion fronts are of a completely different nature. Negative ions diffuse freely in the plasma core (no convection), whereas the negative ion front propagates towards the chamber walls with a nearly constant velocity. The concept of fronts turns out to be very effective in analysis of plasma density profile evolution in strongly non-isothermal plasmas.
Date:
December 18, 2000
Creator:
Kaganovich, Igor
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Invisible braces]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
December 18, 2000, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
On the Ideal Boundary Condition in a General Toroidal Geometry for a Mixed Magnetic Field Representation
Subtleties of implementing the standard perfectly conducting wall boundary condition in a general toroidal geometry are clarified for a mixed scalar magnetic field representation. An iterative scheme based on Ohm's law is given.
Date:
December 18, 2000
Creator:
Tang, X. Z.
Object Type:
Report
System:
The UNT Digital Library
Origins of the Nevada Test Site
None
Date:
December 18, 2000
Creator:
Fehner, Terrence R. & Gosling, F. G.
Object Type:
Report
System:
The UNT Digital Library