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[Flyer: The Gospel Gurls] (open access)

[Flyer: The Gospel Gurls]

Flyer advertising a concert hosted by the Junior Black Academy of Arts and Letters on April 8-9, 2000, at the Dallas Convention Center Theatre Complex. The event featured gospel music from a gospel singing group.
Date: April 2000
Creator: Junior Black Academy of Arts and Letters
Object Type: Pamphlet
System: The UNT Digital Library
Gamma-ray Sptectrometric Characterization of Overpacked CC 104/107 RH-TRU Wastes: Surrogate Tests (open access)

Gamma-ray Sptectrometric Characterization of Overpacked CC 104/107 RH-TRU Wastes: Surrogate Tests

Development of the gamma-ray spectrometric technique termed GSAK (Gamma-Ray Spectrometry with Acceptable Knowledge) for the characterization of CC104/107 remote-handled transuranic (RH-TRU) wastes continued this year. Proof-of-principle measurements have been completed on the surrogate RH-TRU waste drums configured earlier this year. The GSAK technique uses conventional gamma-ray spectrometry to quantify the detectable fission product content of overpacked RH-TRU drums. These results are then coupled with the inventory report to characterize the waste drum content. The inventory report is based on process knowledge of the waste drum loading and calculations of the isotopic distribution in the spent fuel examined to generate the drummed wastes. Three RH-TRU surrogate drums were configured with encapsulated EBR-II driver fuel rod segments arranged in the surrogate drum assemblies. Segment-specific inventory calculations initially specified the radionuclide content of the fuel segments and thus the surrogate drums. Radiochemical assays performed on representative fuel element segments identified a problem in the accuracy of some of the fission and activation product inventory values and provided a basis for adjustment of the specified surrogate drum inventories. The three waste drum surrogates, contained within their 8.9 cm (3.5 inch) thick steel overpacks, were analyzed by gamma-ray spectrometry at the TREAT facility at Argonne …
Date: April 1, 2000
Creator: Hartwell, John Kelvin; Mc Ilwain, Michael Edward & Klann, R. T.
Object Type: Report
System: The UNT Digital Library
The Gayly Oklahoman (Oklahoma City, Okla.), Vol. 18, No. 7, Ed. 1 Saturday, April 1, 2000 (open access)

The Gayly Oklahoman (Oklahoma City, Okla.), Vol. 18, No. 7, Ed. 1 Saturday, April 1, 2000

Semi-monthly newspaper from Oklahoma City, Oklahoma that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date: April 1, 2000
Creator: Hawkins, Don
Object Type: Newspaper
System: The UNT Digital Library
Geothermal Resource/Reservoir Investigations Based on Heat Flow and Thermal Gradient Data for the United States (open access)

Geothermal Resource/Reservoir Investigations Based on Heat Flow and Thermal Gradient Data for the United States

Several activities related to geothermal resources in the western United States are described in this report. A database of geothermal site-specific thermal gradient and heat flow results from individual exploration wells in the western US has been assembled. Extensive temperature gradient and heat flow exploration data from the active exploration of the 1970's and 1980's were collected, compiled, and synthesized, emphasizing previously unavailable company data. Examples of the use and applications of the database are described. The database and results are available on the world wide web. In this report numerical models are used to establish basic qualitative relationships between structure, heat input, and permeability distribution, and the resulting geothermal system. A series of steady state, two-dimensional numerical models evaluate the effect of permeability and structural variations on an idealized, generic Basin and Range geothermal system and the results are described.
Date: April 1, 2000
Creator: Blackwell, D. D.; Wisian, K. W.; Richards, M. C. & Steele, J. L.
Object Type: Report
System: The UNT Digital Library
Grating light reflection spectroelectrochemistry for detection of trace amounts of aromatic hydrocarbons in water (open access)

Grating light reflection spectroelectrochemistry for detection of trace amounts of aromatic hydrocarbons in water

Grating light reflection spectroscopy (GLRS) is an emerging technique for spectroscopic analysis and sensing. A transmission diffraction grating is placed in contact with the sample to be analyzed, and an incident light beam is directed onto the grating. At certain angles of incidence, some of the diffracted orders are transformed from traveling waves to evanescent waves. This occurs at a specific wavelength that is a function of the grating period and the complex index of refraction of the sample. The intensities of diffracted orders are also dependent on the sample's complex index of refraction. The authors describe the use of GLRS, in combination with electrochemical modulation of the grating, for the detection of trace amounts of aromatic hydrocarbons. The diffraction grating consisted of chromium lines on a fused silica substrate. The depth of the grating lines was 1 {micro}m, the grating period was 1 {micro}m, and the duty cycle was 50%. Since chromium was not suitable for electrochemical modulation of the analyte concentration, a 200 nm gold layer was deposited over the entire grating. This gold layer slightly degraded the transmission of the grating, but provided satisfactory optical transparency for the spectroelectrochemical experiments. The grating was configured as the working …
Date: April 1, 2000
Creator: KELLY,MICHAEL J.; SWEATT,WILLIAM C.; KEMME,SHANALYN A.; KASUNIC,K.J.; BLAIR,DIANNA S.; ZAIDI,S.H. et al.
Object Type: Report
System: The UNT Digital Library
The Hawaiian Monk Seal in the Northwestern Hawaiian Islands, 1998 (open access)

The Hawaiian Monk Seal in the Northwestern Hawaiian Islands, 1998

The following report provides the findings of a 1998 field study over the Hawaiian monk seal in the Northwestern Hawaiian Islands. These studies evaluate the status and trends of monk seal populations, natural history traits (survival, reproduction, growth, behavior, and feeding habits), and the success of various activities designed to facilitate population growth.
Date: April 2000
Creator: Johanos, Thea C. & Baker, Jason D.
Object Type: Report
System: The UNT Digital Library
Heavy-Section Steel Irradiation Program (open access)

Heavy-Section Steel Irradiation Program

Maintaining the integrity of the reactor pressure vessel (RPV) in a light-water-cooled nuclear power plant is crucial in preventing and controlling severe accidents that have the potential for major contamination release. Because the RPV is the only key safety-related component of the plant for which a redundant backup system does not exist, it is imperative to fully understand the degree of irradiation-induced degradation of the RPV's fracture resistance that occurs during service. For this reason, the Heavy-Section Steel Irradiation (HSSI) Program has been established.
Date: April 2000
Creator: Rosseel, T. M.
Object Type: Report
System: The UNT Digital Library
Hellcat News, (Sheridan, Wyo.), Vol. 53, No. 8, Ed. 1, April 2000 (open access)

Hellcat News, (Sheridan, Wyo.), Vol. 53, No. 8, Ed. 1, April 2000

Newsletter published by the 12th Armored Division Association, discussing news related to the activities of the U.S. Army unit and updates on previous members of the division.
Date: April 2000
Creator: Twelfth Armored Division Association (U.S.)
Object Type: Newspaper
System: The Portal to Texas History
High Performance Computing Today (open access)

High Performance Computing Today

In last 50 years, the field of scientific computing has seen a rapid change of vendors, architectures, technologies and the usage of systems. Despite all these changes the evolution of performance on a large scale however seems to be a very steady and continuous process. Moore's Law is often cited in this context. If the authors plot the peak performance of various computers of the last 5 decades in Figure 1 that could have been called the supercomputers of their time they indeed see how well this law holds for almost the complete lifespan of modern computing. On average they see an increase in performance of two magnitudes of order every decade.
Date: April 1, 2000
Creator: Dongarra, Jack; Meuer,Hans; Simon,Horst D. & Strohmaier,Erich
Object Type: Article
System: The UNT Digital Library
Hilltop Views (Austin, Tex.), Vol. 15, No. 10, Ed. 1 Saturday, April 1, 2000 (open access)

Hilltop Views (Austin, Tex.), Vol. 15, No. 10, Ed. 1 Saturday, April 1, 2000

Student newspaper from St. Edward's University in Austin, Texas that includes news and information of interest to the college community along with advertising.
Date: April 1, 2000
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History
Hybrid baryon signatures (open access)

Hybrid baryon signatures

The authors discuss whether a low-lying hybrid baryon should be defined as a three quark--gluon bound state or as three quarks moving on an excited adiabatic potential. We show that the latter definition becomes exact, not only for very heavy quarks, but also for specific dynamics. We review the literature on the signatures of hybrid baryons, with specific reference to strong hadronic decays, electromagnetic couplings, diffractive production and production in {psi} decay.
Date: April 1, 2000
Creator: Page, P.
Object Type: Article
System: The UNT Digital Library
Hydrologic and geochemical controls on the transport of radionuclides in natural undisturbed arid environments as determined by accelerator mass spectrometry measurements (open access)

Hydrologic and geochemical controls on the transport of radionuclides in natural undisturbed arid environments as determined by accelerator mass spectrometry measurements

This project developed techniques for measuring globally distributed radionuclides that occur today in extremely low abundances (''fallout'' from the era of atmospheric nuclear testing), and then applied these techniques to better understand the mechanisms by which radionuclides migrate. The techniques employ accelerator mass spectrometry (AMS), a relatively new analytical tool that permits this work to be conducted for the first time. The goal in this project was to develop AMS analytical techniques for {sup 129}I (fallout concentration: {approx} 10{sup 6} atoms/g) {sup 99}Tc ({approx} 10{sup 9} atoms/g), {sup 90}Sr ({approx}10{sup 7} atoms/gram soil), and {sup 93}Zr ({approx} 10{sup 9} atoms/g), and improved methods for {sup 36}Cl ({approx} 10{sup 9} atoms/g). As a demonstration of the analytical techniques, and as an investigation of identified problems associated with characterizing moisture and radionuclide movement in unsaturated desert soils, we developed a vadose zone research site at the Nevada Test Site. Our findings can be summarized as follows: (1) The distribution of chloride and {sup 36}Cl at the research site indicates that the widely-used ''chloride accumulation'' method for estimating moisture flux is erroneous; some mechanism for attenuation of chloride exists, violating an assumption of the accumulation method; (2) {sup 129}I is fractionated into several …
Date: April 1, 2000
Creator: Nimz, G. J.; Caffee, M. W. & McAninch, J.
Object Type: Report
System: The UNT Digital Library
Hydropower R&D: Recent Advances in Turbine Passage Technology (open access)

Hydropower R&D: Recent Advances in Turbine Passage Technology

The purpose of this report is to describe the recent and planned R&D activities across the U.S. related to survival of fish entrained in hydroelectric turbines. In this report, we have considered studies that are intended to develop new information that can be used to mitigate turbine-passage mortality. This review focuses on the effects on fish of physical or operational modifications to turbines, comparisons to survival in other downstream passage routes (e.g., bypass systems and spillways), and applications of new modeling, experimental, and technological approaches to develop a greater understanding of the stresses associated with turbine passage. In addition, the emphasis is on biological studies, as opposed to the engineering studies (e.g., turbine index testing) that re often carried out in support of fish passage mitigation efforts.
Date: April 1, 2000
Creator: Rinehart, Bennie Nelson & Cada, G. F.
Object Type: Report
System: The UNT Digital Library
The ideal strength and mechanical hardness of solids (open access)

The ideal strength and mechanical hardness of solids

Relationships between intrinsic mechanical hardness and atomic-scale properties are reviewed, Hardness scales closely and linearly with shear modulus for a given class of material (covalent, ionic or metallic). A two-parameter fit and a Peierls-stress model produce a more universal scaling relationship, but no model can explain differences in hardness between the transition metal carbides and nitrides. Calculations of ''ideal strength'' (defined by the limit of elastic stability of a perfect crystal) are proposed. The ideal shear strengths of fcc aluminum and copper are calculated using ab initio techniques and allowing for structural relaxation of all five strain components other than the imposed strain. The strengths of Al and Cu are similar (8-9% of the shear modulus), but the geometry of the relaxations in Al and Cu is very different. The relaxations are consistent with experimentally measured third-order elastic constants. The general thermodynamic conditions of elastic stability that set the upper limits of mechanical strength are derived. The conditions of stability are shown for cubic (hydrostatic), tetragonal (tensile) and monoclinic (shear) distortions of a cubic crystal. The implications of this stability analysis to first-principles calculations of ideal strength are discussed, and a method to detect instabilities orthogonal to the direction of …
Date: April 1, 2000
Creator: Krenn, Christopher
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Image reconstruction for a Positron Emission Tomograph optimized for breast cancer imaging (open access)

Image reconstruction for a Positron Emission Tomograph optimized for breast cancer imaging

The author performs image reconstruction for a novel Positron Emission Tomography camera that is optimized for breast cancer imaging. This work addresses for the first time, the problem of fully-3D, tomographic reconstruction using a septa-less, stationary, (i.e. no rotation or linear motion), and rectangular camera whose Field of View (FOV) encompasses the entire volume enclosed by detector modules capable of measuring Depth of Interaction (DOI) information. The camera is rectangular in shape in order to accommodate breasts of varying sizes while allowing for soft compression of the breast during the scan. This non-standard geometry of the camera exacerbates two problems: (a) radial elongation due to crystal penetration and (b) reconstructing images from irregularly sampled data. Packing considerations also give rise to regions in projection space that are not sampled which lead to missing information. The author presents new Fourier Methods based image reconstruction algorithms that incorporate DOI information and accommodate the irregular sampling of the camera in a consistent manner by defining lines of responses (LORs) between the measured interaction points instead of rebinning the events into predefined crystal face LORs which is the only other method to handle DOI information proposed thus far. The new procedures maximize the use …
Date: April 1, 2000
Creator: Virador, Patrick R.G.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
An implicit Smooth Particle Hydrodynamic code (open access)

An implicit Smooth Particle Hydrodynamic code

An implicit version of the Smooth Particle Hydrodynamic (SPH) code SPHINX has been written and is working. In conjunction with the SPHINX code the new implicit code models fluids and solids under a wide range of conditions. SPH codes are Lagrangian, meshless and use particles to model the fluids and solids. The implicit code makes use of the Krylov iterative techniques for solving large linear-systems and a Newton-Raphson method for non-linear corrections. It uses numerical derivatives to construct the Jacobian matrix. It uses sparse techniques to save on memory storage and to reduce the amount of computation. It is believed that this is the first implicit SPH code to use Newton-Krylov techniques, and is also the first implicit SPH code to model solids. A description of SPH and the techniques used in the implicit code are presented. Then, the results of a number of tests cases are discussed, which include a shock tube problem, a Rayleigh-Taylor problem, a breaking dam problem, and a single jet of gas problem. The results are shown to be in very good agreement with analytic solutions, experimental results, and the explicit SPHINX code. In the case of the single jet of gas case it has …
Date: April 1, 2000
Creator: Knapp, Charles E.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Innovative hybrid gas/electric chiller cogeneration (open access)

Innovative hybrid gas/electric chiller cogeneration

January Progress--A kick-off meeting was held in San Diego with Alturdyne on January 21st. The proposed hybrid gas/electric chiller/cogenerator design concept was discussed in detail. The requirements and functionality of the key component, a variable speed, constant frequency motor/generator was presented. Variations of the proposed design were also discussed based on their technical feasibility, cost and market potential. The discussion is documented in a Trip Report. February Progress--After significant GRI/Alturdyne discussion regarding alternative product design concepts, the team made a decision to continue with the proposed product design, a hybrid chiller capable of also providing emergency power. The primary benefits are: (a) the flexibility and operating cost savings associated with the product's dual fuel capability and (b) the emergency power feature. A variable speed, constant frequency motor/generator would significantly increase the cost of the product while providing marginal benefit. (The variable speed, constant frequency motor generator is estimated to cost $25,000 versus $4,000 for a constant speed version). In addition, the interconnection requirements to the electric grid would significantly limit market penetration of the product. We will proceed with a motor/generator design capable of serving as the electric prime mover for the compressor as well as the generator for emergency …
Date: April 1, 2000
Creator: Nowakowski, G.
Object Type: Report
System: The UNT Digital Library
Integrated Outcrop and Subsurface Studies of the Interwell Environment of Carbonate Reservoirs: Clear Fork (Leonardian Age) Reservoirs, West Texas and New Mexico (open access)

Integrated Outcrop and Subsurface Studies of the Interwell Environment of Carbonate Reservoirs: Clear Fork (Leonardian Age) Reservoirs, West Texas and New Mexico

We have completed 18 months of this project and are reporting progress we have made in the areas of fracture and reservoir modeling. Task 1a: Construct Model of Outcrop Stratigraphic Framework has been completed. Task 1b: Construct Model of Fine-Scale Petrophysical Heterogeneity has been completed. Task 1c: Construct Model of Fracture Porosity and Permeability the object of this task is to characterize fracture porosity and distribution in the Wasson Clear Fork reservoir and to determine the effects of fractures on well performance. The approach is to measure fracture attributes in an analog outcrop, to develop models of fracture spacing and aperture, and to apply this information to the South Wasson Clear Fork reservoir. A data set has been collected from outcrops of the Clear Fork Formation, Apache Canyon, Sierra Diablo Mountains, West Texas, and a summary of the results is presented.
Date: April 1, 2000
Creator: Lucia, F. Jerry & Laubach, Stephen E.
Object Type: Report
System: The UNT Digital Library
INTEGRATING A LINEAR INTERPOLATION FUNCTION ACROSS TRIANGULAR CELL BOUNDARIES (open access)

INTEGRATING A LINEAR INTERPOLATION FUNCTION ACROSS TRIANGULAR CELL BOUNDARIES

Computational models of particle dynamics often exchange solution data with discretized continuum-fields using interpolation functions. These particle methods require a series expansion of the interpolation function for two purposes: numerical analysis used to establish the model's consistency and accuracy, and logical-coordinate evaluation used to locate particles within a grid. This report presents discrete-expansions for a linear interpolation function commonly used within triangular cell geometries. Discrete-expansions, unlike a Taylor's series, account for interpolation discontinuities across cell boundaries and, therefore, are valid throughout a discretized domain. Verification of linear discrete-expansions is demonstrated on a simple test problem.
Date: April 1, 2000
Creator: WISEMAN, J. R. & BROCK, J. S.
Object Type: Article
System: The UNT Digital Library
International Journal of Government Auditing, April 2000, Vol. 27, No. 2 (open access)

International Journal of Government Auditing, April 2000, Vol. 27, No. 2

Other written product issued by the General Accounting Office with an abstract that begins "This journal of the International Organization of Supreme Audit Institution (INTOSAI) includes articles concerning: (1) auditing in the South Pacific; (2) new training infrastructure in the Asian Organization of Supreme Audit Institutions; (3) national responsibilities and international activities of selected Supreme Audit Institutions; (4) the office of the Auditor General of Mexico; (5) reports in print; and (6) activities within INTOSAI."
Date: April 1, 2000
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
International Journal of Government Auditing, April 2000, Vol. 27, No. 2 (German Version) (open access)

International Journal of Government Auditing, April 2000, Vol. 27, No. 2 (German Version)

Other written product issued by the General Accounting Office with an abstract that begins "This journal of the International Organization of Supreme Audit Institution (INTOSAI) includes articles concerning: (1) auditing in the South Pacific; (2) new training infrastructure in the Asian Organization of Supreme Audit Institutions; (3) national responsibilities and international activities of selected Supreme Audit Institutions; (4) the office of the Auditor General of Mexico; (5) reports in print; and (6) activities within INTOSAI."
Date: April 1, 2000
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
International Journal of Government Auditing, April 2000, Vol. 27, No. 2 (Spanish Version) (open access)

International Journal of Government Auditing, April 2000, Vol. 27, No. 2 (Spanish Version)

Other written product issued by the General Accounting Office with an abstract that begins "This Spanish-language edition of the Journal of the International Organization of Supreme Audit Institutions (INTOSAI) includes articles regarding (1) auditing in the South Pacific, (2) new training infrastructure in the Asian Organization of Supreme Audit institutions, (3) national responsibilities and international activities of selected Supreme Audit Institutions, (4) the office of the Auditor General of Mexico, (5) reports in print, and (6) activities within INTOSAI."
Date: April 1, 2000
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
JFMIP News: A Newsletter for Government Financial Managers, Spring 2000, Vol. 12, No. 1 (open access)

JFMIP News: A Newsletter for Government Financial Managers, Spring 2000, Vol. 12, No. 1

Other written product issued by the General Accounting Office with an abstract that begins "GAO provided information on the Joint Financial Management Improvement Program's current financial management initiatives, activities, and practices."
Date: April 1, 2000
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
JOINT STUDY OF IMPROVED SAFEGUARDS METHODOLOGY USING NO-NOTICE RANDOMIZED INSPECTION AT JNC'S Pu HANDLING FACILITIES (open access)

JOINT STUDY OF IMPROVED SAFEGUARDS METHODOLOGY USING NO-NOTICE RANDOMIZED INSPECTION AT JNC'S Pu HANDLING FACILITIES

After the Iraq war, the International Atomic Energy Agency (IAEA) 93+2 Program was developed to strengthen and improve the cost-effectiveness of the existing safeguards system. In particular, the Program aims to enhance the IAEA ability to detect undeclared nuclear activities and materials. The IAEA 93+2 Program includes: (1) Increased access to information and its effective use; (2) Increased physical access; (3) Optimum use of the existing system. The measures considered are divided in two parts: measures in Part 1 are those, which may be implemented within the existing IAEA authority; Part 2 measures require complementary legal authority, in the form of an additional Protocol, INFCIRC/540. A description of the status of its implementation can be found in ``Implementation of the Additional Protocol'' (Cooley, 1999). In particular, increased physical access includes access beyond locations requiring additional authorities derived from the INFCIRC/540 and no-notice randomized inspections. No-notice randomized inspections could enhance the inspection effectiveness and efficiency by increasing the coverage of the material involved, providing better confirmation of the operational status of the facilities and higher degree of confidence that no undeclared activities or materials existed at the facilities--including the detection of possible measures to conceal diversions.
Date: April 1, 2000
Creator: LU,M.S. & SANBORN,J.B.
Object Type: Report
System: The UNT Digital Library