Access
Partner
UNT Libraries Special Collections
387
UNT Libraries Government Documents Department
340
Oklahoma Historical Society
139
UNT Libraries
29
Sterling Municipal Library
26
Carl Albert Congressional Research and Studies Center
16
Red River County Public Library
12
Abilene Christian University Library
9
Atlanta Public Library
9
Burleson Public Library
9
78 More
Collection
Texas Digital Newspaper Program
338
KXAS-NBC 5 News Collection
302
Office of Scientific & Technical Information Technical Reports
283
Tocker Foundation Grant
167
Oklahoma Digital Newspaper Program
158
Texas State Publications
30
Chickasha Newspaper Collection
29
LGBT Collections
29
Altus Times-Democrat
27
Sapulpa Herald
26
134 More
Degree Department
States
Year
Month
Language
1,259 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
1,259
next
[Letter from Bill McCarter and Jack Davis to Don R. Roberts, March 26, 1991]
Photocopy of a letter from Bill McCarter and Jack Davis, co-directors of North Texas Institute for Educators on the Visual Arts, to Don R. Roberts, Superintendent for Forth Worth ISD. In discussion of Roberts supportive efforts to implement discipline-art based education, DBAE in Fort Worth. NTIEVA invites Roberts to a reception and dinner on June 29th, to thank him and other retiring superintendents from their consortium districts.
Date:
March 26, 1991
Creator:
Davis, Donald Jack & McCarter, William
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Cassandra Broadus to Marilyn Ingram, March 6, 1991]
Photocopy of a letter from Cassandra Broadus, North Texas Institute for Educators on the Visual Arts, to Marilyn Ingram, Kimbell Art Museum. In regards to the Art-O-Gram art education newspaper series and that the Kimbell will be featured on specific days as followed, March 19, May 7, June 11 and June 18. Broadus also requests to include works from the Kimbell in another article or two for the summer months.
Date:
March 6, 1991
Creator:
Broadus, Cassandra
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Cassandra Broadus to Anne Sears, March 7 1991]
Photocopy of a letter from Cassandra Broadus, North Texas Institute for Educators on the Visual Arts, to Anne Sears, teacher at T.D. Marshall Learning Center. Broadus has given Sears lesson plans from Kay Alexander's Learning to Look and Create: The SPECTRA Series. Broadus writes that the art curriculum offers numerous ideas for correlating activities with concepts and addresses interdisciplinary curriculum ideas, highlighting some important introductory lesson plans that Broadus believes will be useful for Sears. Lesson plans are missing from letter.
Date:
March 7, 1991
Creator:
Broadus, Cassandra
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Cassandra Broadus to Melanie Wright, March 6, 1991]
Photocopy of a letter from Cassandra Broadus, North Texas Institute for Educators on the Visual Arts, to Melanie Wright, Dallas Museum of Art. Broadus requests the use of two or three permanent pieces from the DMA to use in "Art-O-Gram" and "Class Acts" an art education newspaper series in the Fort Worth Star Telegram. The articles are designed for children to give them something more than just an art project but to talk about and view work critically and develop better communication skills.
Date:
March 6, 1991
Creator:
Broadus, Cassandra
Object Type:
Letter
System:
The UNT Digital Library
Development of improved cathodes for solid oxide fuel cells
The University of Missouri-Rolla conducted a 17 month research program focused on the development and evaluation of improved cathode materials for solid oxide fuel cells (SOFC). The objectives of this program were: (1) the development of cathode materials of improved stability in reducing environments; and (2) the development of cathode materials with improved electrical conductivity. The program was successful in identifying some potential candidate materials: Air sinterable (La,Ca)(Cr,Co)O{sub 3} compositions were developed and found to be more stable than La{sub .8}Sr{sub .2}MnO{sub 3} towards reduction. Their conductivity at 1000{degrees}C ranged between 30 to 60 S/cm. Compositions within the (Y,Ca)(Cr,Co,Mn)O{sub 3} system were developed and found to have higher electrical conductivity than La{sub .8}Sr{sub .2}MnO{sub 3} and preliminary results suggest that their stability towards reduction is superior.
Date:
March 1, 1991
Creator:
Anderson, H.U.
Object Type:
Report
System:
The UNT Digital Library
A survey of air flow models for multizone structures
Air flow models are used to simulate the rates of incoming and outgoing air flows for a building with known leakage under given weather and shielding conditions. Additional information about the flow paths and air-mass flows inside the building can only by using multizone air flow models. In order to obtain more information on multizone air flow models, a literature review was performed in 1984. A second literature review and a questionnaire survey performed in 1989, revealed the existence of 50 multizone air flow models, all developed since 1966, two of which are still under development. All these programs use similar flow equations for crack flow but differ in the versatility to describe the full range of flow phenomena and the algorithm provided for solving the set of nonlinear equations. This literature review was found that newer models are able to describe and simulate the ventilation systems and interrelation of mechanical and natural ventilation. 27 refs., 2 figs., 1 tab.
Date:
March 1, 1991
Creator:
Feustel, H.E. & Dieris, J.
Object Type:
Report
System:
The UNT Digital Library
Optimizing procedures for a human genome repository
Large numbers of clones will be generated during the Human Genome Project. As each is characterized, subsets will be identified which are useful to the scientific community at large. These subsets are most readily distributed through public repositories. The American Type Culture Collection (ATCC) is experienced in repository operation, but before this project had no history in managing clones and associated information in large batches instead of individually. This project permitted the ATCC to develop several procedures for automating and thus reducing the cost of characterizing, preserving, and maintaining information about clones.
Date:
March 1, 1991
Creator:
Nierman, W.C.
Object Type:
Report
System:
The UNT Digital Library
A method to estimate the concentration of elements in smoke from burning vegetation growing in contaminated soil
The Savannah River Site has areas where soil is contaminated with metals and/or radionuclides. Many of these areas are surrounded by native vegetation which is growing adjacent to the area and where the roots have penetrated into the contaminated soil of the area. In some cases vegetation has actually invaded the contaminated area. Even though the volume of contaminated vegetation is small, there are problems associated with its disposal. Vegetation decomposes quickly after burial and the volume of buried vegetation can decrease. The voids left can lead to subsidence and possible failure of the clay cap constructed over hazardous and/or radioactive waste burial grounds. An alternative to burying the wood is to burn it and bury the ash. However, burning will introduce the contamination in the vegetation into the air where there is potential for inhalation of the contaminants. A procedure is described to assess the hazard associated with inhalation of contamination from burning of vegetation growing in contaminated soil. The procedure is applied to evaluation of the consequence of burning vegetation grown adjacent to and in the SRL Seepage Basins. The results indicate that burning the vegetation during the day could introduce a level of contaminants to the atmosphere …
Date:
March 4, 1991
Creator:
Murphy, C. E. Jr.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of management options for disposal of salt and trace element laden agricultural drainage water from the Fallon Indian Reservation, Fallon, Nevada
This is the final report describing work performed on the Fallon Indian Reservation by the Earth Sciences Division at Lawrence Berkeley Laboratory during FY90. These investigations were initiated at the request of the United States Bureau of Reclamation in response to recent concerns regarding disposal of agriculture drainage water from the Reservation. The Reservation is transected by numerous irrigation and drainage canals, including the TJ Drain. Recent investigations by the US Fish and Wildlife Service have demonstrated that water in the TJ Drain is toxic to several aquatic indicator organisms, including bluegills, fathead minnows and daphnids. This information, coupled with recent die-offs of fish and birds, has lead to concern about continued discharge of TJ Drain water into local surface waters. In late 1990, plans for closing the TJ Drain and providing for alternative drainage were initiated. We aim to provide information for assessing options fro disposal of agricultural drainage water from the Reservation. In particular, our studies focuses on irrigation and drainage of lands currently serviced by the TJ Drain. Options for continued irrigation and drainage of the Reservation fall broadly into two categories: options that provide an alternative to drain water disposal into the SWMA; and options that …
Date:
March 1, 1991
Creator:
Tokunaga, Tetsu & Benson, S.
Object Type:
Report
System:
The UNT Digital Library
Demonstration of rapid and sensitive module leak certification for space station freedom
A leak detection and quantification demonstration using perflurocarbon tracer (PFT) technology was successfully performed at the NASA Marshall Space Flight Center on January 25, 1991. The real-time Dual Trap Analyzer (DTA) at one-half hour after the start of the first run gave an estimated leak rate of 0.7 mL/min. This has since been refined to be 1.15 {plus minus} 0.09 mL/min. The leak rates in the next three runs were determined to be 9.8 {plus minus} 0.7, {minus}0.4 {plus minus} 0.3, and 76 {plus minus} 6 mL/min, respectively. The theory on leak quantification in the steady-state and time-dependent modes for a single zone test facility was developed and applied to the above determinations. The laboratory PFT analysis system gave a limit-of-detection (LOD) of 0.05 fL for ocPDCH. This is the tracer of choice and is about 100-fold better than that for the DTA. Applied to leak certification, the LOD is about 0.00002 mL/s (0.000075 L/h), a 5 order-of-magnitude improvement over the original leak certification specification. Furthermore, this limit can be attained in a measurement period of 3 to 4 hours instead of days, weeks, or months. A new Leak Certification Facility is also proposed to provide for zonal (three zones) …
Date:
March 1, 1991
Creator:
Dietz, R. N. & Goodrich, R. W.
Object Type:
Report
System:
The UNT Digital Library
Fundamental studies of catalytic gasification
Studies of the catalytic steam gasification of carbon solids continued. A considerable number of important findings have been made. Recently limited experimentation has been carried out on the production of C{sub 2} hydrocarbons from methane in the presence of Ca/K/Ni oxide catalysts and of oxygen, carbon and water. The main finding thus far has been that C{sub 2} yields of 10--13% can be obtained at about 600{degrees}C or 150{degrees} lower temperature than described in the literature for similar yields. Yields of 7--10% C{sub 2} hydrocarbons at 99+% selectivity have been obtained. The presence of water and small amounts of oxygen is essential. Yields of this magnitude may be attractive since there is no loss of methane to valueless by-products, no purification of the recycle steam is required and no oxygen is used to burn methane. Further improvement in yields by catalyst and operating conditions modification will be investigated. It is also intended to clarify the chemistry which inhibits burning of methane to carbon oxides. Work is discussed on gasification of petroleum cokes and oxidative methane coupling. 8 figs., 2 tabs.
Date:
March 1, 1991
Creator:
Heinemann, H. & Somorjai, G.A.
Object Type:
Report
System:
The UNT Digital Library
3D field harmonics
We have developed an harmonic representation for the three dimensional field components within the windings of accelerator magnets. The form by which the field is presented is suitable for interfacing with other codes that make use of the 3D field components (particle tracking and stability). The field components can be calculated with high precision and reduced cup time at any location (r,{theta},z) inside the magnet bore. The same conductor geometry which is used to simulate line currents is also used in CAD with modifications more readily available. It is our hope that the format used here for magnetic fields can be used not only as a means of delivering fields but also as a way by which beam dynamics can suggest correction to the conductor geometry. 5 refs., 70 figs.
Date:
March 30, 1991
Creator:
Caspi, S.; Helm, M. & Laslett, L.J.
Object Type:
Report
System:
The UNT Digital Library
Cost-Effectiveness of Compact Fluorescent Lighting
Compact fluorescent technologies have been steadily improving. There has been increased interest in utilizing compact fluorescents to provide cost-effective energy savings for electric utilities in the residential sector. Several utilities in the United States have already distributed compact fluorescents to consumers free of charge. This study assesses the cost-effectiveness of compact fluorescents from the perspectives of consumers and utilities in the Pacific Northwest, where electricity rates are, on average, the lowest in the United States. The study also assesses cost-effectiveness from a societal perspective. Secondary hearing impacts and the value of reduced emissions of pollutants are incorporated into the analysis. Results indicate that compact fluorescents are more likely to be cost-effective as the perspective upon which they are assessed is broadened. Thus, they are least likely to be viewed as cost-effective by consumers, more likely to be considered cost-effective from a utility perspective, and almost always cost-effective from a societal perspective. Given these differences, is is suggested that policies be developed to capture the societal benefits of compact fluorescent retrofits through alternative regulatory or market mechanisms.
Date:
March 1, 1991
Creator:
Lesser, J. A. & Byers, R.
Object Type:
Report
System:
The UNT Digital Library
1991 Conference summary on computing in high energy physics
The papers presented at the Conference cover a wide range of important issues in software engineering and management. They indicate a trend toward more use of commercial systems and standards. This trend will likely have a significant influence on plans for future systems.
Date:
March 1, 1991
Creator:
Loken, S.C.
Object Type:
Article
System:
The UNT Digital Library
The LBL geothermal reservoir technology program
The main objective of the DOE/GD-funded Geothermal Reservoir Technology Program at Lawrence Berkeley Laboratory is the development and testing of new and improved methods and tools needed by industry in its effort to delineate, characterize, evaluate, and exploit hydrothermal systems for geothermal energy. This paper summarizes the recent and ongoing field, laboratory, and theoretical research activities being conducted as part of the Geothermal Reservoir Technology Program. 28 refs., 4 figs.
Date:
March 1, 1991
Creator:
Lippmann, M.J.
Object Type:
Article
System:
The UNT Digital Library
Ductile-Brittle Transition Temperature testing of tungsten using the three-point bend test
Three-point bend tests were performed to determine the Ductile-Brittle Transition Temperatures (DBTTs) of forged and chemical vapor deposition (CVD) tungsten. Testing was performed under quasi-static conditions at temperatures between 23{degrees}C and 450{degrees}C using a forced-air environmental chamber. Load-displacement data from the three-point bend tests indicated that the constitutive behavior of the materials tested varied considerably. Finite element modeling of the three-point bend test was performed to investigate plastic strains induced in the samples during testing as a function of constitutive behavior. The modeling assumed plane stress conditions in the sample and simple bi-linear elastic-plastic constitutive behavior of the test material. The strains induced in the samples were found to be functions of both the yield stress and work hardening behavior of the materials. The use of the three-point bend test to determine DBTT, and the DBTTs reported for the test materials, are discussed relative to the modeling results. It is concluded that the three-point bend test has some utility in the determination of DBTTs if some caution is used in the selection of test parameters and fixture geometries. However, the three-point bed test does not provide a complete picture of the nature of the ductile-brittle transition. 12 refs., 9 figs.
Date:
March 5, 1991
Creator:
Lassila, D.H.; Magness, F. & Freeman, D.
Object Type:
Report
System:
The UNT Digital Library
Alternate design concept for the SSC dipole magnet cryogenic support post
New materials and developments in the field of advanced composites have created the opportunity to take a fresh look into the design of the cryogenic supports for SSC collider dipole cryostats. Although the present reentrant post design meets the structural and thermal requirements, its assembly requires precision and proficiency. The objective of the proposed alternate concept is to reduce the overall cost of the support post by means of simplifying and optimizing its component design and assembly process. The present shrink fitted tube assembly may potentially be replaced by injection molded parts. New resin systems with lower thermal conductivity and high strength properties enable the utilization of automated production techniques such as injection molding and filament winding. This paper will provide analysis and design information for the alternate support post concept and compare its test performance and cost to the present support post. 3 refs., 12 figs., 4 tabs.
Date:
March 1, 1991
Creator:
Lipski, A.; Nicol, T.H. & Richardson, R.
Object Type:
Article
System:
The UNT Digital Library
Meson and baryon correlation studies using the PEP-TPC/2. gamma. Facility
Results on vector meson, and strange and charmed-baryon production are presented for data taken during the period 1982--1986 using the TPC/2{gamma} detector at PEP. Vector mesons ({rho}{sup 0}, K{sup *} and {phi}) with 0, 1 and 2 strange quarks are used to obtain redundant measures of strange-quark suppression and of the vector to pseudoscalar ratio in hadronization. Measurements of the production rates of {Lambda}, {Xi}{sup {minus}}, {Omega} and {Xi}{sup *0} hyperons and for the {Lambda}{sub c} and of rapidity correlations between {Lambda}{bar {Lambda}} pairs provide sensitive tests of baryon production in fragmentation models. In addition, two- and three-particle correlations between like sign pions provide further evidence for the Bose-Einstein effect in e{sup +}e{sup {minus}} interactions including the relativistic motion of particle sources. 9 refs., 7 figs.
Date:
March 1, 1991
Creator:
Ronan, M.T.
Object Type:
Article
System:
The UNT Digital Library
Status of 4-cm-aperture, 17-m-long SSC dipole magnet R D program at BNL
Over the last year, several 4-cm-aperture, 17-m-long dipole magnet prototypes were built by Brookhaven National Laboratory (BNL) under contract with the Superconducting Super Collider (SSC) Laboratory. These prototypes are the last phase of a half-decade-long R D program, carried out in collaboration with Fermi National Accelerator Laboratory and Lawrence Berkeley Laboratory, and aimed at demonstrating the feasibility of the SSC main ring magnets. They also lay the ground for the 5-cm aperture dipole magnet program to be started soon. After reviewing the design features of the BNL 4-cm-aperture, 17-m-long dipole magnets, we describe in detail the various steps of their fabrication. For each step, we discuss the parameters that need to be mastered, and we compare the values that were achieved for the five most recent prototypes. The data appear coherent and reproducible, demonstrating that the assembly process in under control. 23 refs., 10 figs., 4 tabs.
Date:
March 1, 1991
Creator:
Devred, A.; Bush, T.; Coombes, R.; DiMarco, J.; Goodzeit, C.; Kuzminski, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Re-powering and site recycling in a competitive environment
Re-powering and site recycling are strategies designed to expand electric generating capacity by using depreciated assets. The resource base for the these strategies is large. By 1995, over 170,000 MW of fossil-fired capacity will be in excess of thirty years old, and approaching the end of its conventional economic lifetime. This paper explores how these assets might be developed using competitive market forces. While some re-powering is being pursued under traditional ratebase regulation, there are four other generic alternatives. These are: (1) utility investment at fixed prices with regulatory pre-approval, (2) utility investment under competitive bidding, (3) utility leasing for private producer development, and (4) utility sale of sites for private producer development. Issues associated with each alternative are explored and illustrated with examples. State regulatory policy will be the critical determinant of whether a market develops for depreciated power plants. Financial incentives will stimulate utilities to re-deploy depreciated assets. This means some form of profit-sharing between customers and shareholders of the grains from asset sales. Different approaches to profit sharing are reviewed. These developments are still in an experimental state, however, and no single approach appears to have emerged as a dominant trend. 36 refs., 1 tab.
Date:
March 1, 1991
Creator:
Taylor, A. & Kahn, E.P.
Object Type:
Report
System:
The UNT Digital Library
A progress report on the Berkeley search for distant supernovae to measure. Omega
Over the past two years, in collaboration with the Anglo-Australian Observatory, we have constructed a prototype version of the hardware and software needed to discover distant supernovae for a measurement of {Omega}, the ratio of the average density of the universe to the critical density. To make this measurement, we will use Type Ia supernova, which are now thought to be adequate standard candles for this purpose. 5 refs.
Date:
March 1, 1991
Creator:
Pennypacker, C.; Perlmutter, S.; Goldhaber, G.; Marvin, H.; Muller, R. (Lawrence Berkeley Lab., CA (United States) California Univ., Berkeley, CA (United States). Center for Particle Astrophysics); Boyle, B.J. (Cambridge Univ. (United Kingdom). Inst. of Astronomy) et al.
Object Type:
Article
System:
The UNT Digital Library
Southwest Retort, Volume 44, Number [12], March 1991
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
March 1991
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Kxp and kxpl : a Busy Man's LaTeX
This report introduces the following programs: kxp: a time-saving LaTeX preprocessor, kxpl: kxp plus latex, kxh: a help facility for kxp and LaTex, ptex: a program for printing a LaTeX document, and pptex: a program for printing parts of a LaTeX document. More detailed descriptions will be given in Part 2: A Reference Manual. The appendix gives instructions on how to use Argonne's Mathematics and Computer Science Division letterhead and intralaboratory memo L(sup A)T(sub E)X styles.
Date:
March 1991
Creator:
Kwong, Man Kam
Object Type:
Report
System:
The UNT Digital Library
Guidelines to Achieve Seals with Minimal Leak Rates for HWR-NPR Coolant System Components
Existing technology for seal systems was reviewed with regard to flange, elastomer, valve, and pump design. A technology data base for the designers of the HWR-NPR coolant system was derived from operating experience and seal development work on reactors in the United States, Canada, and Europe. This data base was then used to generate guidelines for the design of seals and/or joints for the HWR-NPR coolant system. Also discussed are needed additional research and development, as well as the necessary component qualification tests for an effective quality control program.
Date:
March 1991
Creator:
Finn, P. A.
Object Type:
Report
System:
The UNT Digital Library