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[Letter from Jack Davis and Bill McCarter to Susan Dantzler, June 10, 1991]
Photocopy of a letter from Jack Davis and Bill McCarter, co-directors of North Texas Institute for Educators on the Visual Arts, to Susan Dantzler, Principal of Harrington Elementary. Welcoming Dantzler to the second summer institute conducted by North Texas Institute for Educators on the Visual Arts being held from June 17 - 28. Principals are encouraged to attend the institute as much as possible, however, there are special events for the administrators on the first and last days of the institute and they will be paid a stipend of forty dollars.
Date:
June 10, 1991
Creator:
Davis, Donald Jack
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Nancy Cason to Polly Tallas, February 27, 1991]
Photocopy of a letter from Nancy Cason, Project Coordinator of North Texas Institute for Educators on the Visual Arts, to Polly Tallas, Saigling Elementary. In regards to the institute putting together a video to show the teachers who have not yet received training. Cason would like to include a video of Tallas, that she received from Lynda Alford, teaching story telling to her second grade students using art reproductions into the video. NTIEVA feels Tallas' well-designed lesson will serve as an inspiring model for others and hoping Tallas will contact them soon with permission.
Date:
February 27, 1991
Creator:
Cason, Nancy
Object Type:
Letter
System:
The UNT Digital Library
[Document from Bill McCarter to Beverly Fletcher, March 26, 1991]
Photocopy of a document from Bill McCarter, Co-Director of North Texas Institute for Educators on the Visual Arts, to Beverly Fletcher. The document is separated into two sections, the first section being about Dr. Jack Davis, Provost of UNT and a major figure in Art Education having won many awards for his service to the discipline of art education along with Dr. Bill McCarter, Regents Professor at UNT. Both Davis and McCarter are co-directors of NTIEVA, North Texas Institute for Educators on the Visual Arts, an institute funding by matching grants from the Getty Center, Amon Carter Foundation and others. The second part of the letter is about their program, DBAE, the approach to art education by involve art specialists and classroom teachers in expanding art to include not only art production but critical thinking, judgement and other formalities. The hand-written note at the bottom reads, "Bev. we need overhead projector - thanks."
Date:
May 26, 1991
Creator:
McCarter, William
Object Type:
Letter
System:
The UNT Digital Library
A replaceable reflective film for solar concentrators
The 3M Company manufactures a silvered acrylic film called ECP-305 that is regarded as the preferred reflective film for use on stretched-membrane heliostats. However, ECP-305 will degrade in time, due to both corrosion of the silver layer and delamination at the film's silver-to-acrylic interface, and will eventually need to be replaced. 3M uses a very aggressive adhesive on this film, and once it is laminated, replacement is very difficult. The purpose of this investigation was the development of a replaceable reflector, a reflective film that can be easily removed and replaced. A replaceable reflector was successfully configured by laminating ECP-305 to the top surface of a smooth, dimensionally stable polymer film, with a removable adhesive applied to the underside of the polymer film. Several stages of screening and testing led to the selection of a 0.010-inch thick polycarbonate (GE 8030) as the best polymer film and a medium tack tape (3M Y-9425) was selected as the best removable adhesive. To demonstrate the feasibility of the replaceable reflector concept and to provide a real-time field test, the chosen construction was successfully applied to the 50-m{sup 2} SKI heliostat at the Central Receiver Test Facility at Sandia National Laboratories in Albuquerque. 4 …
Date:
September 1, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Oak Ridge Reservation Environmental report for 1990
The first two volumes of this report are devoted to a presentation of environmental data and supporting narratives for the US Department of Energy's (DOE's) Oak Ridge Reservation (ORR) and surrounding environs during 1990. Volume 1 includes all narrative descriptions, summaries, and conclusions and is intended to be a stand-alone'' report for the ORR for the reader who does not want to review in detail all of the 1990 data. Volume 2 includes the detailed data summarized in a format to ensure that all environmental data are represented in the tables. Narratives are not included in Vol. 2. The tables in Vol. 2 are addressed in Vol. 1. For this reason, Vol. 2 cannot be considered a stand-alone report but is intended to be used in conjunction with Vol. 1.
Date:
September 1, 1991
Creator:
Wilson, A.R. (ed.)
Object Type:
Report
System:
The UNT Digital Library
Results of magnetic field measurements of 40 mm aperture 17-m long SSC model collider dipole magnets
Magnetic field measurements have been made on twelve 17 m-long, 40 mm-aperture R D superconducting dipoles. Data on dipole field strength, multipole coefficients, and alignment have been obtained. The data indicate that the magnets as built are generally within the expectations for this design. 7 refs., 5 figs.
Date:
January 1, 1991
Creator:
Wanderer, P.; Anerella, M.; Cottingham, J.; Ganetis, G.; Garber, M.; Ghosh, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Dilepton (e sup + e sup minus ) production recent pp and pd studies with DLS at Berkeley
The use of dileptons as probes of hot, dense hadronic matter is described. Preliminary results on dileptons produced in p-p and p-d interactions at the Bevalac are presented along with potential ramifications for existing model calculations of dileptons at these energies. Future directions of the dilepton program at Berkeley are outlined. 14 refs., 3 figs.
Date:
September 1, 1991
Creator:
Schroeder, L. S.
Object Type:
Article
System:
The UNT Digital Library
Improved tunnel resistance of silvered-polymer mirrors
This report documents the research performed at the Solar Energy Research Institute during fiscal year (FY) 1991 to develop ways to prevent delamination failure (known as tunneling) of silvered-polymer reflector materials. Several promising approaches have been identified and demonstrated that substantially reduce such failures. These approaches include (1) use of Tedlar edge tape rather than the manufacturer-recommended ECP-244 tape, (2) thermal treatment of laminated reflector/substrate constructions, and (3) application of silver to the polymer film through an alternative deposition process. Approaches 1 and 2 offer readily available engineering solutions to the delamination problem. Approaches 2 and 3 provide tunnel resistance over the entire surface of the reflector material, including the edges. Tedlar (a polyvinyl fluoride from DuPont) tape is an opaque white tape available in different widths from 3M Company. The base material has demonstrated outstanding outdoor durability. Thermal treatment of ECP-305 laminated to substrate materials has demonstrated outstanding resistance to tunneling. Alternative silver deposition techniques such as sputtering (rather than thermal evaporation) offer increased resistance to tunneling. 15 refs., 10 figs.
Date:
October 1, 1991
Creator:
Jorgensen, G.; Schissel, P.; Kennedy, C.; Shinton, Y.; Powell, D. & Siebarth, J.
Object Type:
Report
System:
The UNT Digital Library
Polysaccharides and bacterial plugging
Before any successful application of Microbial Enhanced Oil Recovery process can be realized, an understanding of the cells' transport and retentive mechanisms in porous media is needed. Cell transport differs from particle transport in their ability to produce polysaccharides, which are used by cells to adhere to surfaces. Cell injection experiments have been conducted using Leuconostoc cells to illustrate the importance of cellular polysaccharide production as a transport mechanism that hinders cell movement and plugs porous media. Kinetic studies of the Leuconostoc cells, carried out to further understand the plugging rates of porous media, have shown that the cells' growth rates are approximately equal when provided with monosaccharide (glucose and fructose) or sucrose. The only difference in cell metabolism is the production of dextran when sucrose is supplied as a carbon source. Experimentally it has also been shown that the cells' growth rate is weakly dependent upon the sucrose concentration in the media, and strongly dependent upon the concentration of yeast extract. The synthesis of cellular dextran has been found to lag behind cell generation, thus indicating that the cells need to reach maturity before they are capable of expressing the detransucrase enzyme and synthesizing insoluble dextran. Dextran yields were …
Date:
November 1, 1991
Creator:
Fogler, H. S.
Object Type:
Report
System:
The UNT Digital Library
Geophysics: Building E5032 decommissioning, Aberdeen Proving Ground
integration of data from surveys using three geophysical technologies has provided information used to define the locations of buried utilities, tanks, vaults, and debris near building E5032 at the Aberdeen Proving Ground. Ground penetrating radar (GPR) profiles indicate the presence of buried pipes, tanks, reinforcement rods (rebar), and remnants of railroad tracks. A magnetic map constructed from a detailed magnetic survey on the north side of the building outlines buried iron-rich objects that are interpreted to be iron pipes, tank, and other debris of uncertain origin at relatively shallow depths. Horizontal electrical resistivity surveys and vertical electrical resistivity soundings essentially corroborated the findings obtained with the magnetometer and GPR. In addition, a highly resistance layer was observed on the east side of the building where a former railroad bed with a thick grave fill is believed to immediately underlie the lawn. The resistivity data show no evidence of a conductive leachate plume. Geophysical measurements from three techniques over a buried concrete slab approximately 130 ft north of Building E5032 give geophysical signatures interpreted to be due to the presence of a large iron tank or vault. An attempt was made to gather meaningful magnetic data on the east, west, and …
Date:
July 1, 1991
Creator:
McGinnis, L.D. & Miller, S.F.
Object Type:
Report
System:
The UNT Digital Library
SNL initiatives in electronic fluxless soldering
Conventional soldering of electronic components generally requires the application of a chemical flux to promote solder wetting and flow. Chlorofluorocarbons (CFC) and halogenated solvents are normally used to remove the resulting flux residues. While such practice has been routinely accepted throughout the electronics industry, the environmental impact of hazardous solvents on ozone depletion will eventually limit or prevent their use. Solvent substitution or alternative technologies must be developed to meet these goals. Sandia National Laboratories, Albuquerque has a comprehensive environmentally conscious electronics manufacturing program underway that is funded by the DOE Office of Technology Development. Primary elements of the integrated task are the characterization and development of alternative fluxless soldering technologies that would eliminate circuit board cleaning associated with flux residue removal. Storage and handling of hazardous solvents and mixed solvent-flux waste would be consequently reduced during electronics soldering. This paper will report on the progress of the SNL fluxless soldering initiative. Emphasis is placed on the use of controlled atmospheres, laser heating, and ultrasonic soldering.
Date:
January 1, 1991
Creator:
Hosking, F. M.; Frear, D. R.; Vianco, P. T. & Keicher, D. M.
Object Type:
Article
System:
The UNT Digital Library
Creep of whisker-reinforced ceramics
The results of high-temperature creep of various ceramic composites will be reviewed. In particular, creep results for Al{sub 2}O{sub 3} and Si{sub 3}N{sub 4} matrices reinforced with SiC whiskers will be emphasized. For a given temperature, stress and grain size, the creep rate of the Al{sub 2}O{sub 3} composite is usually lower than that of the ceramic matrix. In general, creep at low stresses occurs by grain boundary sliding accommodated by diffusion, whereas higher stresses lead to damage accumulation processes which are manifested by triple point cavitation and cracking. The quasi-steady-state creep rates depend on grain size, whisker concentration, and the amount of glass phase present between the boundary of the whisker and the matrix. Unless all of the parameters are known, including the fabrication and loading histories, comparisons between various studies that used samples prepared in different ways are difficult. 44 refs., 7 figs., 2 tabs.
Date:
January 1, 1991
Creator:
Routbort, J.L; Goretta, K.C. (Argonne National Lab., IL (United States)); Dominguez-Rodriguez, A. & de Arellano-Lopez, A.R. (Seville Univ. (Spain))
Object Type:
Article
System:
The UNT Digital Library
Techniques and processes for the measurement of the resonances of small single crystals
The mechanical resonances of small oriented single crystals of materials of interest to basic science and engineering can be used to determine all the elastic moduli and the ultrasonic attenuation of these materials. To measure the resonances of the samples without introducing the resonances of the measuring system requires that the transducers be non-resonant at the frequencies of interest, and that they be well isolated from their mounts. However, for samples near 1 mm in the largest dimension, the transducer design problem becomes sever, and the signals become weak. In addition, no resonances can be missed, and, often, the symmetry class of the resonances must be known. We outline here appropriate transducer, electronics, and system designs to circumvent these problems. 10 refs., 4 figs.
Date:
January 1, 1991
Creator:
Migliori, A.; Stekel, A.; Sarrao, J.L.; Visscher, W.M.; Bell, T. & Lei, M.
Object Type:
Article
System:
The UNT Digital Library
Microstructural and solidification cracking evaluation of electron beam welds in 304L
Weld hot cracking of stainless steels is a major materials-related problem in the welding industry. This present investigation evaluates the crack susceptibility of highly-constrained EB welds made in materials whose DeLong ferrite potentials range from zero to nine FN. In addition, the effect of piece part strength level on cracking is examined. This study has revealed that these deep penetration EB welds have regions that solidify as primary austenite, even when the DeLong ferrite potential is as high as 9 FN. This points out the critical role that solidification rate plays in the crack susceptibility of these highly restrained welds. In addition, 0 FN to 0 FN welds had primarily transverse cracks while 6 FN to 0 FN welds had primarily centerline cracks. Of particular interest is the observation that cracks still occur if a high ferrite (greater than 6 FN) component is welded to a zero FN component. Cracking is always associated with regions which solidify as primary austenite and these cracks occur because there are areas in the weld which do not mix. Thus it is not a recommended production practice to compensate for low ferrite in one piece part with high ferrite in its mate. Finally, it …
Date:
January 1, 1991
Creator:
Sturgill, P.L.; Campbell, R.D. & Henningsen, J.L.
Object Type:
Article
System:
The UNT Digital Library
Influences of clouds and rain on the large-scale transport and deposition of sulfur
This paper describes the application of a three-dimensional, global-scale Eulerian model with an explicit description of cloud and chemical processes. Simulation results describing the transport of sulfur from North America and Europe across the north Atlantic Ocean during a climatological July are presented. Wet deposition was found to contribute slightly more to total sulfur deposition than dry deposition, a feature explained by the large amounts of precipitation during this month. The wet deposition patterns did not always correspond to the emissions patterns. The precipitation rate and spatial distribution had a large effect on the calculated concentrations of soluble sulfur species. 10 refs., 7 figs., 1 tab.
Date:
July 1, 1991
Creator:
Luecken, D.J.; Berkowitz, C.M. & Easter, R.C.
Object Type:
Article
System:
The UNT Digital Library
Process and analytical studies of enhanced low severity co-processing using selective coal pretreatment
This report describes progress on research during the eleventh quarter of this contract dealing with applications of coal pretreatment techniques in coal/oil co-processing and direct hydroliquefaction. The objectives of the project are to investigate various coal pretreatment techniques and to determine the effect of these pretreatment procedures on the reactivity of the coal. Reactivity enhancement will be evaluated under both direct hydroliquefaction and co-processing conditions. Coal conversion utilizing low rank coals and low and severity conditions (reaction temperatures generally less than 350{degrees}C) is the primary focus of the liquefaction experiments, as it is expected that the effect of pretreatment conditions and the attendant reactivity enhancement will be greatest for these coals and at these conditions. This document presents a summary of results for the first set of a series of runs intended to simulate operation of a two-stage integrated liquefaction reactor train. These studies were designed to investigate the effect of the severity of the first stage liquefaction process on the required severity and resulting yields from the second stage. Process conditions were varied between thermal and catalytic for both stages, and from temperatures of 350 to 400{degrees}C at a nominal residence time of 30 minutes. These data will provide …
Date:
1991-06~
Creator:
Baldwin, R. M.; Gaur, S. & Miller, R. L.
Object Type:
Report
System:
The UNT Digital Library
A sendmail. cf scheme for a large network
Like most large networked sites our users depend heavily on the electronic mail system for both internal and off-site communications. Unfortunately the sendmail.cf file, which is used to control the behavior of the sendmail program, is somewhat cryptic and difficult to decipher for the neophyte. So, on one hand you have a highly visible, frequently used utility, and on the other hand a not-so-easily acquired system administration forte. Here is the sendmail topology of our site, what premises we based it on, and the parts of the sendmail.cf files which support the topology.
Date:
August 14, 1991
Creator:
Darmohray, T.M.
Object Type:
Article
System:
The UNT Digital Library
Advanced photovoltaic concentrator system low-cost prototype module
This report describes the continued development of an extruded lens and the development of a PV receiver, both of which will be used in the Solar Engineering Applications Corporation (SEA) 10X concentrator. These efforts were pare of a pre-Concentrator Initiative Program. The 10X concentrator consists of an inexpensive, extruded linear Fresnel lens which focuses on one-sun cells which are adhesive-bonded to an anodized aluminum heat sink. Module sides are planned to be molded along with the lens and are internally reflective for improved on- and off-track performance. End caps with molded-in bearings complete the module. Ten modules are mounted in a stationary frame for simple, single-axis tracking in the east-west direction. This configuration an array, is shipped completely assembled and requires only setting on a reasonably flat surface, installing 4 fasteners, and hooking up the wires. Development of the 10-inch wide extruded lens involved one new extrusion die and a series of modifications to this die. Over 76% lens transmission was measured which surpassed the program goal of 75%. One-foot long receiver sections were assembled and subjected to evaluation tests at Sandia National Laboratories. A first group had some problem with cell delamination and voids but a second group performed …
Date:
September 1, 1991
Creator:
Kaminar, N.R.; McEntee, J. & Curchod, D. (Solar Engineering Applications Corp., San Jose, CA (United States))
Object Type:
Report
System:
The UNT Digital Library
Growth rate of dislocation loop in Fe-Ni-Cr alloy under Kr sup + ion and electron irradiation
In order to examine the effect of irradiating particle species on the growth rate of radiation-induced dislocation loops, a solution-annealed Fe-25Ni-15Cr-0.02C alloy was irradiated at 723 K first by 1.5 MeV Kr{sup +} ions for 2520 sec, then by 1.5 MeV Kr{sup +} ions and 1.0 MeV electrons simultaneously for 780 sec, and finally by 1.0 MeV electrons for 780 sec with the HVEM-Tandem Facility in Argonne National Laboratory. The calculated damage rate by 1.5 MeV Kr{sup +} ions was 5.8 {times} 10{sup {minus}4} dpa/s, and that by 1.0 MeV electrons was 1 {times} 10{sup {minus}4} dpa/s. The growth rate of a dislocation loop located at the center of the specimen was 7 {times} 10{sup {minus}3} nm/s for the Kr{sup +} ion irradiation, 4 {times} 10{sup {minus}2} nm/s for the simultaneous Kr{sup +} and electron irradiation, and (2--3) {times} 10{sup {minus}2} nm/s for the electron irradiation. This implies that the electron irradiation is about 19 times more effective in the growth of radiation-induced dislocation loops than the Kr{sup +} ion irradiation. The dislocation loop growth rate under the simultaneous Kr{sup +} and electron irradiation is higher than the sum of the growth rates under the individual Kr{sup +} and electron …
Date:
October 1, 1991
Creator:
Kimoto, T. (National Research Inst. for Metals, Tsukuba, Ibaraki (Japan)); Allen, C.W. & Rehn, L.E. (Argonne National Lab., IL (United States))
Object Type:
Article
System:
The UNT Digital Library
The laser switched linac and development of a high brilliance electron source
This task originated in 1987 to explore the possibility of accelerating short bursts of electrons by pulsed power. The principal effort of our group was to demonstrate that electrons can be accelerated by picosecond-long electrical pulses which are compressed in a radial transmission line. This goal has new been achieved and our results are presented in this paper. We have achieved a gradient of 45 MV/m across a 250 {mu}m accelerating gap and have accelerated 10{sup 6} electrons in a 1 ps long pulse. The beam emerges from a 500 {mu}m hole and can be refocused to this transverse dimension. The efficiency of the system, is of order {eta} = 2 {times} 10{sup {minus}6} due to the small number of electrons accelerated. If we identify the gap spacing with one half wavelength of the accelerating r.f.,''our device is equivalent to a 600 GHz structure. The principal limitation in the accelerating gradient comes from the H.V. hold-off properties of the semiconductor disks that are used as photoconductive switches. We believe that with better materials a factor of 10 can be gained in the gradient. Similarly, the electron yield can be increased by at least three orders of magnitude if proper photocathodes …
Date:
September 1, 1991
Creator:
Melissinos, A.C.; Bamber, C.; Blalock, T.; Fry, A. & Wilson, T.
Object Type:
Report
System:
The UNT Digital Library
Test results of BNL built 40-mm aperture, 17-m-long SSC collider dipole magnets
Eleven 17 m long, 40 mm aperture SSC R D superconducting collider dipole magnets, built at BNL, have been extensively tested at BNL and Fermilab during 1990--91. Quench performance of these magnets and details of their mechanical behavior are presented. 7 refs., 5 figs.
Date:
June 1, 1991
Creator:
Kuzminski, J.; Bush, T.; Coombes, R.; Devred, A.; DiMarco, J.; Goodzeit, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Discrete event simulation in an artificial intelligence environment: Some examples
Several Los Alamos National Laboratory (LANL) object-oriented discrete-event simulation efforts have been completed during the past three years. One of these systems has been put into production and has a growing customer base. Another (started two years earlier than the first project) was completed but has not yet been used. This paper will describe these simulation projects. Factors which were pertinent to the success of the one project, and to the failure of the second project will be discussed (success will be measured as the extent to which the simulation model was used as originally intended). 5 figs.
Date:
January 1, 1991
Creator:
Roberts, D.J. & Farish, T.
Object Type:
Article
System:
The UNT Digital Library
Background information on the SSC project
This report discusses the following information about the Superconducting Super Collider: Goals and milestones; civil construction; ring components; cryogenics; vacuum and cooling water systems; electrical power; instrumentation and control systems; and installation planning.
Date:
October 1, 1991
Creator:
Warren, J.
Object Type:
Report
System:
The UNT Digital Library
The quest for greenhouse-constrained technologies amid other concerns for environment and energy
As we approach the 21st century, sentiments run high in the US for improved air quality in our cities and for a more secure energy future, hopefully to be manifest in lesser dependence on foreign supplies of oil. These sentiments are reflected in intense political activity on both the federal and state levels to enact legislation that will help alleviate both problems. At the same time though, the recent emergence of awareness of a threat of global warming due to ever increasing emissions of greenhouse gases has only served as an additional complicating factor, one which has not been fully dealt with either socially or politically in the US. Much discussion and deliberation on the issue of the greenhouse effect is underway in the US and aimed at understanding the size of the problem as well as identifying options for solutions. This paper will review the recent political climate on issues of environment and energy and will include brief descriptions of the recent US Clean Air Act Amendments, the California Clean Air Act, the National Energy Strategy, and the Alternative Motor Fuels Act of 1988. These policies and programs form a backdrop for the additional and more recent challenges brought …
Date:
January 1, 1991
Creator:
McGill, R.N.
Object Type:
Article
System:
The UNT Digital Library