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2,163 Matching Results

Start Over Year 1994 Month July

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Results: 1 - 24 of 2,163 next

(open access)

[Letter: From Maison to Royal]

A letter from Don Maison, from the AIDS Service of Dallas, to Charlie Royal, from the State Bar of Texas, discussing the attached legal documents.

Date: July 25, 1994

Creator: AIDS Service of Dallas

Object Type: Letter

System: The UNT Digital Library

(open access)

[Confidential Letter: Maison to Martin]

A confidential letter from Don Maison, from the AIDS Services of Dallas, to Jack Martin from the Texas Board of Law Examiners.

Date: July 14, 1994

Creator: AIDS Services of Dallas

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter: From Martin to Maison]

A letter from Don Maison, from the AIDS Services of Dallas, to Jack Martin, from the Texas Board of Law Examiners.

Date: July 26, 1994

Creator: AIDS Services of Dallas

Object Type: Letter

System: The UNT Digital Library

(open access)

[Letter: Nelson to Maison]

A letter from Don Maison, from the AIDS Service of Dallas, to Mary Klapperich, from the State Bar of Texas.

Date: July 27, 1994

Creator: AIDS Services of Dallas

Object Type: Letter

System: The UNT Digital Library

(open access)

Rheological characterization of nuclear waste using falling-ball rheometry

Knowledge of the rheological properties of saturated solutions containing solid particles is very important in nuclear waste management technology. For example, the nuclear waste in the Hanford Site high-level radioactive waste tanks contains strong electrolyte solutions with a high concentration of solids. Previous attempt using rotational viscometers to determine the rheology has shown unusual thixotropic and shear thinning behaviors with a lack of reproducibility. Using falling-ball rheometry, the rheology of the undisturbed simulant may be determined with much better reproducibility. In this study, a well-mixed simulant which has similar chemical composition to the actual waste will be tested. Falling-ball size and density will be varied to get data in a wide range of shear rates. To determine the rheogram, several methods will be tried to match the observed data. Based on these tests, a rheogram can be determined from the model and its best-fit parameters. The simulant shows shear-thinning behavior and a yield stress. This would suggest a H-B model. But when fitting to one of the simulants which showed a very low yield stress, the predictions assuming no yield and assuming yield resulted in no improvement in the fit when assuming yield.

Date: July 1, 1994

Creator: Abbott, J. R.; Unal, C.; Stephens, T.; Pasamehmetoglu, K. O.; Graham, A. L. & Edwards, J. N.

Object Type: Article

System: The UNT Digital Library

(open access)

First results from SAGE II

The Russian-American Gallium solar neutrino Experiment (SAGE) began the second phase of operation (SAGE II) in September of 1992. Monthly measurements of the integral flux of solar neutrinos have been made with 55 tonnes of gallium. The K-peak results of the first five runs of SAGE II give a capture rate of 76{sub {minus}18}{sup +21} (stat) {sub {minus}7}{sup +5} (sys) SNU. combined with the SAGE I result, the capture rate is 74{sub {minus}12}{sup +13} (stat) {sub {minus}7}{sup +5} (sys) SNU. This represents only 56%--60% of the capture rate predicted by different Standard Solar Models.

Date: July 1, 1994

Creator: Abdurashitov, J. N.; Faizov, E. L. & Gavrin, V. N.

Object Type: Report

System: The UNT Digital Library

(open access)

The role of catalyst precursor anions in coal gasification. Tenth quarterly report

This project investigates the roles of various aqueous soluble catalyst precursors containing various anions, specifically acetate (CH{sub 3}COO{sup {minus}}), chloride (Cl{sup {minus}}), nitrate (NO{sub 3}{sup {minus}}), sulfate (SO{sub 4}{sup 2{minus}}) and carbonate (CO{sub 3}{sup 2{minus}}) on the surface electrical properties of coal and seeks to understand the effects of these salts on the adsorption, dispersion and activities of calcium and potassium. The current report discusses the reactivities the lignite derived char catalyzed by {approximately}0.05 - 0.07 %wt. potassium. The catalytic compounds used were potassium acetate, potassium carbonate, potassium chloride, potassium nitrate, and potassium sulfate. The initial concentration of each salt solution from which potassium was ion-exchanged onto the coal was 0.001 mol/L and the metal was ion-exchanged onto the coal at the approximate pHs of 2, 6 and 9. Although the potassium contents in the chars were similar ({approximately}0.05 - 0.07 %wt.), a wide spread of char reactivities were observed. Char gasification ranged from > 90 %wt. to < 20 %wt. At this time, no general correlation between char reactivities, catalyst type, catalyst precursor anions or catalyst loading pH is obvious. However, the data are currently being analyzed in terms of zeta potentials to determine the effect, if any, of …

Date: July 1, 1994

Creator: Abotsi, G. M. K.

Object Type: Report

System: The UNT Digital Library

(open access)

Cryogenic systems for the HEB accelerator of the Superconducting Super Collider

This report discusses the following topics related to the Superconducting Super Collider: Cryogenic system -- general requirements; cryogenic system components; heat load budgets and refrigeration plant capacities; flow and thermal characteristics; process descriptions; cryogenic control instrumentation and value engineering trade-offs.

Date: July 1, 1994

Creator: Abramovich, S. & Yuecel, A.

Object Type: Report

System: The UNT Digital Library

(open access)

Analysis and optimization of an adsorption air conditioner for electric vehicle applications

This paper shows an analysis of the applicability of an adsorption system for electric vehicle (EV) air conditioning. Adsorption systems are designed and optimized to provide the required cooling for four combinations of vehicle characteristics and driving cycles. The resulting adsorption systems are compared with vapor compression air conditioners that can satisfy the cooling load. The objective function is the overall system weight, which includes the cooling system weight and the weight of the battery necessary to provide energy for air conditioner operation. The system with the minimum overall weight is considered to be the best. The results show the optimum values of all the variables, as well as temperatures and amounts adsorbed, for the adsorption and desorption processes. The results indicate that, for the conditions analyzed in this paper, vapor compression air conditioners are superior to adsorption systems, not only because they are lighter, but also because they have a higher COP and are more compact.

Date: July 27, 1994

Creator: Aceves, S. M.

Object Type: Article

System: The UNT Digital Library

(open access)

A hybrid vehicle evaluation code and its application to vehicle design

This report describes a hybrid vehicle simulation model, which can be applied to many of the vehicles currently being considered for low pollution and high fuel economy. The code operates interactively, with all the vehicle information stored in data files. The code calculates fuel economy for three driving schedules, time for 0-96 km/h at maximum acceleration, hill climbing performance, power train dimensions, and pollution generation rates. This report also documents the application of the code to a hybrid vehicle that operates with a hydrogen internal combustion engine. The simulation model is used for parametric studies of the vehicle. The results show the fuel economy of the vehicle as a function of vehicle mass, aerodynamic drag, engine-generator efficiency, flywheel efficiency, and flywheel energy and power capacities.

Date: July 15, 1994

Creator: Aceves, S. M. & Smith, J. R.

Object Type: Article

System: The UNT Digital Library

(open access)

Adsorption air conditioner for electric vehicle applications. Revision 1

This paper shows an analysis of the applicability of an adsorption system for electric vehicle (EV) air conditioning. Adsorption systems are designed and optimized to provide the required cooling for four combinations of vehicle characteristics and driving cycles. The resulting adsorption systems are compared with vapor compression air conditioners that can satisfy the cooling load. The objective function is the overall system weight, which includes the cooling system weight and the weight of the battery necessary to provide energy for air conditioner operation. The system with the minimum overall weight is considered to be the best, because a lower weight results in an increased vehicle range. The results indicate that, for the conditions analyzed in this paper, vapor compression air conditioners are superior to adsorption systems not only because they are lighter, but also because they have a higher COP and are more compact.

Date: July 27, 1994

Creator: Aceves, S.M.

Object Type: Article

System: The UNT Digital Library

(open access)

The Mass Tracking System for the Integral Fast Reactor fuel cycle

As part of the Fuel Cycle Facility (FCF) of Argonne National Laboratory`s Integral Fast Reactor (IFR) demonstration, a computer-based Mass-Tracking (MTG) System has been developed. The MTG System collects, stores, retrieves and processes data on all operations which directly affect the flow of process material through FCF and supports such activities as process modeling, compliance with operating limits (e.g., criticality safety), material control and accountability and operational information services. Its architecture is client/server, with input and output connections to operator`s equipment-control stations on the floor of FCF as well as to terminal sessions. Its heterogeneous database includes a relational-database manager as well as both binary and ASCII data files. The design of the database, and the software that supports it, is based on a model of discrete accountable items distributed in space and time and constitutes a complete historical record of the material processed in FCF. Although still under development, much of the MTG System has been qualified and is in production use.

Date: July 1, 1994

Creator: Adams, C. H.; Beitel, J. C.; Birgersson, G.; Bucher, R. G.; Carrico, C. B.; Daly, T. A. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Evaluation of the SC-1/megasonic clean for sub-0.15 micron particle removal

A statistical design of experiments approach has been employed to evaluate the particle removal efficacy of the SC-1/megasonic clean for sub-0.15 {mu}m inorganic particles. The effects of megasonic input power, solution chemistry, bath temperature, and immersion time have been investigated. Immersion time was not observed to be a statistically significant factor. The NH{sub 4}OH/H{sub 2}O{sub 2} ratio was significant, but varying the molar H{sub 2}O{sub 2} concentration had no effect on inorganic particle removal. Substantially diluted chemistries, performed with high megasonic input power and moderate-to-elevated temperatures, was shown to be very effective for small particle removal. Bath composition data show extended lifetimes can be obtained when high purity chemicals are used at moderate (eg., 45{degrees}C) temperature. Transition metal surface concentrations and surface roughness have been measured after dilute SC-1 processing and compared to metallic contamination following traditional SC-1.

Date: July 1, 1994

Creator: Adkins, C. L. J.; Resnick, P. J.; Clews, P. J.; Thomas, E. V.; Korbe, N. C. & Cannaday, S. T.

Object Type: Article

System: The UNT Digital Library

(open access)

Vacuum deposited polymer/silver reflector material

Weatherable, low cost, front surface, solar reflectors on flexible substrates would be highly desirable for lamination to solar concentrator panels. The method to be described in this paper may permit such reflector material to be fabricated for less than 50 cents per square foot. Vacuum deposited Polymer/Silver/Polymer reflectors and Fabry-Perot interference filters were fabricated in a vacuum web coating operation on polyester substrates. Reflectivities were measured in the wavelength range from .4 {mu}m to .8 {mu}m. It is hoped that a low cost substrate can be used with the substrate laminated to the concentrator and the weatherable acrylic polymer coating facing the sun. This technique should be capable of deposition line speeds approaching 1500 linear feet/minute. Central to this technique is a new vacuum deposition process for the high rate deposition of polymer films. This polymer process involves the flash evaporation of an acrylic monomer onto a moving substrate. The monomer is subsequently cured by an electron beam or ultraviolet light. This high speed polymer film deposition process has been named the PML process - for Polymer Multi-Layer.

Date: July 1, 1994

Creator: Affinito, J.; Martin, P.; Gross, M. & Bennett, W.

Object Type: Article

System: The UNT Digital Library

(open access)

Operational readiness review of the Low Level Waste vaults at Savannah River Site: A case study

Low Level radioactive Waste (LLW) at the Savannah River Site at Aiken, South Carolina, has traditionally been disposed of using engineered trenches in accordance with the guidelines and technology existing at the time. Recently, subgrade concrete vaults known as E-Area Vaults (EAV) have been constructed at SRS. The EAV project is a comprehensive effort for upgrading LLW disposal at SRS based on meeting the requirements of current Department of Energy (DOE) Orders, and addressing more stringent federal and state regulations. The EAV is a first of its kind state-of-the-art facility designed and built in the United States to receive LLW. Westinghouse Savannah River Company (WSRC) conducted an Operational Readiness Review (ORR) of the vaults prior to startup. The objective of the EAV ORR was to perform a comprehensive review of the operational readiness of the facilities per DOE guidelines including Defense Nuclear Facilities Safety Board (DNFSB) recommendations. This review included assessing construction of the vaults as per design, adequate approved procedures, and training of all the personnel associated with the facility operations. EAV ORR incorporated the lessons learned from other DOE ORRs, included DNFSB recommendations, used a graded approach, and utilized subject matter experts for each functional area of assessment.

Date: July 1, 1994

Creator: Ahmad, M.; McVay, C. & Venkatesh, S.

Object Type: Article

System: The UNT Digital Library

(open access)

Investigation of combined SO{sub 2}/NO{sub x} removal by Ceria Sorbents. Quarterly technical progress report, January 1, 1994--March 31, 1994

Simultaneous removal of SO{sub 2} and NO{sub x} using a regenerable solid sorbent will constitute an important improvement over the use of separate processes for the removal of these two pollutants from stack gases and possibly eliminate several shortcomings of the individual SO{sub 2} and NO{sub x} removal operations. This process will allow simple and reliable cleanup of large volumes of stack gases at a competitive cost; produce a concentrated stream of SO{sub 2} which an easily be converted into valuable by-products; be compatible with existing power generation plants; and essentially eliminate the waste materials generated in some other sulfur removal processes. Department of Energy`s Pittsburgh Energy Technology Center (PETC) and UOP/Shell have developed processes which both employ copper oxide-based sorbents in different reactor configurations, namely, former uses a regenerative fluidized bed while the latter employs a cyclic fixed bed contactor. More recent studies at PETC considered cerium oxide as an alternate sorbent to CuO{sup (1,2)}. Ceria improves the resistance of the alumina support to thermal sintering and produces a regeneration off-gas stream that can be easily converted to elemental sulfur. It has potentially higher sulfur capture capacity than copper. The objective of this research is to determine the effects …

Date: July 1, 1994

Creator: Akyurtlu, A. & Akyurtlu, J. F.

Object Type: Report

System: The UNT Digital Library

(open access)

The Boerne Star (Boerne, Tex.), Vol. 90, No. 27, Ed. 1 Wednesday, July 6, 1994

Weekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.

Date: July 6, 1994

Creator: Aldridge, Leon

Object Type: Newspaper

System: The Portal to Texas History

(open access)

The Boerne Star (Boerne, Tex.), Vol. 90, No. 28, Ed. 1 Wednesday, July 13, 1994

Weekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.

Date: July 13, 1994

Creator: Aldridge, Leon

Object Type: Newspaper

System: The Portal to Texas History

(open access)

The Boerne Star (Boerne, Tex.), Vol. 90, No. 29, Ed. 1 Wednesday, July 20, 1994

Weekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.

Date: July 20, 1994

Creator: Aldridge, Leon

Object Type: Newspaper

System: The Portal to Texas History

(open access)

The Boerne Star (Boerne, Tex.), Vol. 90, No. 30, Ed. 1 Wednesday, July 27, 1994

Weekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.

Date: July 27, 1994

Creator: Aldridge, Leon

Object Type: Newspaper

System: The Portal to Texas History

(open access)

Determining uranium speciation in Fernald soils by molecular spectroscopic methods. FY 1993 progress report

This progress report describes new experimental results and interpretations for data collected from October 1, 1992, through September 30, 1993, as part of the Characterization Task of the Uranium in Soils Integrated Demonstration of the Office of Technology Development, Office of Environmental Restoration and Waste Management of the US Department of Energy. X-ray absorption, optical luminescence, and Raman vibrational spectroscopies were used to determine uranium speciation in contaminated soils from the US DOE`s former uranium production facility at Fernald, Ohio. These analyses were carried out both before and after application of one of the various decontamination technologies being developed within the Integrated Demonstration. This year the program focused on characterization of the uranium speciation remaining in the soils after decontamination treatment. X-ray absorption and optical luminescence spectroscopic data were collected for approximately 40 Fernald soil samples, which were treated by one or more of the decontamination technologies.

Date: July 1, 1994

Creator: Allen, P. G.; Berg, J. M.; Crisholm-Brause, C. J.; Conradson, S. D.; Donohoe, R. J.; Morris, D. E. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Development of a Radiative Divertor for DIII-D

We have used experiments and modeling to develop a new radiative divertor configuration for DIII-D. Gas puffing experiments with the existing open divertor have shown the creation of a localized ({approximately}10 cm diameter) radiation zone which results in substantial reduction (3--10) in the divertor heat flux while {delta}{sub E} remains {approximately}2 times ITER-89P scaling. However, ne increases with D{sub 2} puffing, and Z{sub eff} increases with neon puffing. Divertor structures are required to minimize the effects on the core plasma. The UEDGE fluid code, benchmarked with DIII-D data, and the DEGAS neutrals transport code are used to estimate the effectiveness of divertor configurations; slots reduce the core ionization more than baffles. The overall divertor shape is set by confinement studies which indicate that high triangularity ({delta} {approximately}0.8) is important for high {tau}{sub E} VH-modes. Results from engineering feasibility studies, including diagnostic access, will be presented.

Date: July 1, 1994

Creator: Allen, S. L.; Brooks, N. H. & Campbell, R. B.

Object Type: Article

System: The UNT Digital Library

(open access)

Concept definition of traffic flow wide-area surveillance

Traffic management can be thought of as a stochastic queuing process where the serving time at one of its control points is dynamically linked to the global traffic pattern, which is, in turn, dynamically linked to the control point. For this closed-loop system to be effective, the traffic management system must sense and interpret large spatial projections of data originating from multiple sensor suites. The intent of the Wide-Area Surveillance (WAS) Project is to build upon this concept and define the operational specifications and characteristics of a Traffic Flow Wide-Area Surveillance (TFWAS) system in terms of traffic management and control. In doing so, the functional capabilities of a TFWAS will be mapped onto an operational profile that is consistent with the Federal Highway Administration`s Intelligent Vehicle Highway System. This document provides the underlying foundation of this work by offering a concept definition for the TFWAS system. It concentrates on answering the question: ``What is the system?`` In doing so, the report develops a hierarchy of specialized definitions.

Date: July 1, 1994

Creator: Allgood, G. O.; Ferrell, R. K. & Kercel, S. W.

Object Type: Report

System: The UNT Digital Library

(open access)

Distribution-independent hierarchicald N-body methods

The N-body problem is to simulate the motion of N particles under the influence of mutual force fields based on an inverse square law. The problem has applications in several domains including astrophysics, molecular dynamics, fluid dynamics, radiosity methods in computer graphics and numerical complex analysis. Research efforts have focused on reducing the O(N{sup 2}) time per iteration required by the naive algorithm of computing each pairwise interaction. Widely respected among these are the Barnes-Hut and Greengard methods. Greengard claims his algorithm reduces the complexity to O(N) time per iteration. Throughout this thesis, we concentrate on rigorous, distribution-independent, worst-case analysis of the N-body methods. We show that Greengard`s algorithm is not O(N), as claimed. Both Barnes-Hut and Greengard`s methods depend on the same data structure, which we show is distribution-dependent. For the distribution that results in the smallest running time, we show that Greengard`s algorithm is {Omega}(N log{sup 2} N) in two dimensions and {Omega}(N log{sup 4} N) in three dimensions. We have designed a hierarchical data structure whose size depends entirely upon the number of particles and is independent of the distribution of the particles. We show that both Greengard`s and Barnes-Hut algorithms can be used in conjunction with …

Date: July 27, 1994

Creator: Aluru, S.

Object Type: Thesis or Dissertation

System: The UNT Digital Library

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