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[Letter from Bill McCarter and Jack Davis to Don R. Roberts, October 9, 1990]
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 of Fort Worth ISD. In regards to good news that the Amon Carter Foundation has granted NTIEVA $150,000 for the next three years of their program. McCarter and Davis are thrilled as this amount will go a long way towards meeting their five year matching requirement for the Getty grant. It also insure the ongoing work of the institute. Included in the letter are details about how the Getty grant will release their pay increments during the years. McCarter and Davis write that they need some materials from Roberts, discussing some points they've enclosed in the letter, in order to secure the grant with the Getty Center.
Date:
October 9, 1990
Creator:
McCarter, William & Davis, Donald Jack
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Jan Keene Muhlert to Jack Davis and Bill McCarter, April 5, 1990]
Photocopy of a letter from Jan Keene Muhlert, Director of the Amon Carter, to Jack Davis and Bill McCarter, co-directors of North Texas Institute for Educators on the Visual Arts. Thanking them for their invitation for Muhlert to join the advisory committee of the North Texas Institute for Educators on the Visual Arts. Muhlert writes that she will be happy to do so and participate in the activities as time allows.
Date:
April 5, 1990
Creator:
Muhlert, Jan
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Bill McCarter and Nancy Cason to Janice Wiggins, May 8, 1990]
Photocopy of a letter from Bill McCarter and Nancy Cason, North Texas Institute for Educators on the Visual Arts, to Janice Wiggins, Dallas ISD. Iin regards of Dallas' participation in the North Texas Institute for Educators on the Visual Arts. McCarter and Cason write that after reviewing their budget they have found that they will be able to fund one team from DISD at 100% for the first year at the Institute, yet after one year they are unsure that they'll be able to get more funding from the Getty Center to allow Dallas as a consortium. Included at the end of the letter is a mock-up of what Dallas will be entitled to during their Summer institute Services.
Date:
May 8, 1990
Creator:
McCarter, William & Cason, Nancy
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Nancy Cason to Nicole Holland, August, 15, 1990]
Photocopy of a letter from Nancy Cason, North Texas Institute for Educators on the Visual Arts, to Nicole Holland, InterCultura, in regards to their meeting and about the upcoming "Wanderers" exhibition and how NTIEVA might assist Institute K-1 teachers and art specialists in preparing their students for it. Cason writes that they will mention the exhibition in the October NTIEVA newsletter, outlining ideas for connections with K-1 social studies and larger global theme of world peace. Cason will keep in touch with updates about the newsletter.
Date:
August 15, 1990
Creator:
Cason, Nancy
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Bill McCarter to Robert Estes, December 19, 1990]
Photocopy of a letter from Bill McCarter, co-director of North Texas Institute for Educators on the Visual Arts, to Robert Estes, Principal of Borman Elementary School. Addressing how proud North Texas Institute is in the award given to Estes by TAEA, and how no principal in the state of Texas has given more time or energy to the arts in public school education. McCarter ends the letter wishing Estes a joyous holiday.
Date:
December 19, 1990
Creator:
McCarter, William
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Bill McCarter to Sonja Starnes, August 24, 1990]
Photocopy of a letter from Bill McCarter, co-director of North Texas Institute for Educators on the Visual Arts, to Sonja Starnes, Art Teacher at Bedford Heights Elementary. In regards to Starnes's participation in the workshop for elementary art teaches at Hurst-Euless-Bedford ISD. Starnes's leadership was insightful for the other faculty about the implementation of DBAE, discipline-based arts education, in HEB schools and McCarter is looking forward to working with her.
Date:
August 24, 1990
Creator:
McCarter, William
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Cassandra Broadus to Jeannie Sellmeyer, December 17, 1990]
Photocopy of a letter from Cassandra Broadus to Jeannine Sellmeyer, Director of Education at the Denton Co. Historical Museum, writing how much Broadus enjoyed the Docent Training Workshop and for giving Broadus an opportunity to work with the docents. Enclosed in the letter to Sellmeyer, Broadus has sent teacher packets and museum education brochures from Meadows Museum at SMU, to help Sellmeyer gather new ideas for her education tour at the Historical Museum. Teacher packets not present with letter.
Date:
December 17, 1990
Creator:
Broadus, Cassandra
Object Type:
Letter
System:
The UNT Digital Library
Design of a full scale model fuel assembly for full power production reactor flow excursion experiments
A novel full scale production reactor fuel assembly model was designed and built to study thermal-hydraulic effects of postulated Savannah River Site (SRS) nuclear reactor accidents. The electrically heated model was constructed to simulate the unique annular concentric tube geometry of fuel assemblies in SRS nuclear production reactors. Several major design challenges were overcome in order to produce the prototypic geometry and thermal-hydraulic conditions. The two concentric heater tubes (total power over 6 MW and maximum heat flux of 3.5 MW/m{sup 2}) (1.1E+6 BTU/(ft{sup 2}hr)) were designed to closely simulate the thermal characteristics of SRS uranium-aluminum nuclear fuel. The paper discusses the design of the model fuel assembly, which met requirements of maintaining prototypic geometric and hydraulic characteristics, and approximate thermal similarity. The model had a cosine axial power profile and the electrical resistance was compatible with the existing power supply. The model fuel assembly was equipped with a set of instruments useful for code analysis, and durable enough to survive a number of LOCA transients. These instruments were sufficiently responsive to record the response of the fuel assembly to the imposed transient.
Date:
January 1, 1990
Creator:
Nash, C. A. (Westinghouse Savannah River Co., Aiken, SC (United States)); Blake, J. E. & Rush, G. C. (Babcock and Wilcox Co., Alliance, OH (United States))
Object Type:
Article
System:
The UNT Digital Library
Pseudorapidity densities and fluctuations in central sup 32 S interactions at 200A GeV
Observations of heavy ion interactions at the highest available accelerator energies provide essential information for the analysis and interpretation of cosmic ray interactions. We report on an experiment in which emulsion chamber detectors were exposed to beams of 200A GeV {sup 32}S ions at the CERN SPS. We present statistical features of pseudorapidity distributions from central collisions in the experimental sample and compare them with the predictions from the Lund Model (FRITIOF) which contains only conventional physics. 8 refs., 3 figs.
Date:
January 1, 1990
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
Considerations for high-brightness electron sources
Particle accelerators are now used in many areas of physics research and in industrial and medical applications. New uses are being studied to address major societal needs in energy production, materials research, generation of intense beams of radiation at optical and suboptical wavelengths, treatment of various kinds of waste, and so on. Many of these modern applications require a high intensity beam at the desired energy, along with a very good beam quality in terms of the beam confinement, aiming, or focusing. Considerations for ion and electron accelerators are often different, but there are also many commonalties, and in fact, techniques derived for one should perhaps more often be considered for the other as well. We discuss some aspects of high-brightness electron sources here from that point of view. 6 refs.
Date:
January 1, 1990
Creator:
Jameson, Robert A.
Object Type:
Article
System:
The UNT Digital Library
A bulk niobium superconducting quarter wave resonator
A bath-cooled all-niobium 160 MHz quarter wave resonator prototype was constructed and tested. The objective of this research has been the development of a high performance accelerating element with {beta}{sub opt} {approx equal} 0.11 for the ALPI linac at the Laboratori Nazionali di Legnaro. The design of this resonator was based upon a previous 150 MHz model, with minor changes due to the different frequency and to modified welding procedure. An accelerating field of 5 MV/m was achieved at a power dissipation of 10 W and the low power Q was 2.4 {times} 10{sup 8}. The resonator could dissipate 70 W of power without thermal breakdown. 16 refs., 2 figs., 1 tab.
Date:
January 1, 1990
Creator:
Ben-Zvi, Ilan; Chiaveri, E.; Elkonin, B. V.; Facco, A. & Sokolowski, J. S.
Object Type:
Article
System:
The UNT Digital Library
Negative ion-based neutral injection on DIII-D
High energy negative ion-based neutral beam injection is a strong candidate for heating and non-inductive current drive in tokamaks. Many of the questions related to the physics and engineering of this technique remain unanswered. In this paper, we consider the possibility of negative ion-based neutral beam injection on DIII-D. We establish the desired parameter space by examining physics trades. This is combined with potential design constraints and a survey of component technology options to establish an injector concept. Injector performance is estimated assuming particular component technologies, and concept flexibility with respect to incorporating alternate technologies is described. 9 refs., 6 figs., 4 tabs.
Date:
January 1, 1990
Creator:
Stewart, L. D.; Bhadra, D. K.; Colleraine, A. P. & Kim, J.
Object Type:
Article
System:
The UNT Digital Library
Development of improved iron Fischer-Tropsch catalysts
The objective of proposed research is development of catalysts with enhanced slurry phase activity and better selectivity to fuel range products, through a more detailed understanding and systematic studies of the effects of pretreatment procedures and promoters/binders (silica) on catalyst performance.
Date:
January 15, 1990
Creator:
Bukur, D.B. & Patel, S.A.
Object Type:
Report
System:
The UNT Digital Library
Theoretical modeling and experimental characterization of planar defects in Y sub 2 Ba sub 4 Cu sub 6+x O sub 14+x
Crystallographic defects and phase transformations in the system Y{sub 2}Ba{sub 4}Cu{sub 6 + x}O{sub 14 + x}(0{le}{times}{le}4) are investigated by high resolution transmission electron microscopy (TEM) and static lattice, three dimensional Monte Carlo computer simulations. High resolution images of partially transformed (x = 2 to x = 1) material reveal a prevalence of CuO planar defects (stacking faults) associated with the transformation and an absence of disturbance to the perovskite Ba-Y-Ba blocks. An atomic mechanism involving the intercalculation and removal of extra CuO planes by partial dislocation climb, and requiring only a-b plane diffusion, is developed for the formation of such planar defects during changes in the layered YBaCuO crystal structure. Monte Carlo simulations based on the proposed transformation mechanism accurately reproduce the observed defects and known equilibrium structures. 24 refs., 4 figs.
Date:
November 1, 1990
Creator:
Burmester, C. P.; Fendorf, M.; Gronsky, R. & Wille, L. T.
Object Type:
Article
System:
The UNT Digital Library
Establishment and maintenance of a coal sample bank and data base
In this Project Status Report for 7/9/89--10/8/89, results of a comparative study of coal sample deterioration in several container types were presented. In April 1990, one year after the initial analyses, the set of analyses was repeated on the most important container types. The new results are included in Table 2. During the current reporting period a total of 42 data printouts were distributed. In addition, 7 special data requests were fulfilled by either search/sort and printout or creation of a data disk, resulting in distribution of limited information on 2083 samples. Several preliminary requests for Sample Bank and Data Base information and price quotations have also been handled.
Date:
July 11, 1990
Creator:
Davis, A.
Object Type:
Report
System:
The UNT Digital Library
Prototype photon position monitors for undulator beams at the Advanced Light Source
Design criteria are described, and test results are presented, for prototype ALS undulator beam position monitors. The design is based on monitors presently in use at NSLS, with modifications to account for the widely varying and large K values of the undulators to be installed at the ALS. In particular, we have modified the design to simplify the thermal engineering and we have explored techniques to suppress the response of the monitors to soft photons, so that the beam position can be determined by measuring the higher energy photons which are better collimated. 4 refs., 8 figs.
Date:
October 17, 1990
Creator:
Warwick, T.; Shu, D. (Lawrence Berkeley Lab., CA (United States)); Rodricks, B. (Argonne National Lab., IL (United States)) & Johnson, E.D. (Brookhaven National Lab., Upton, NY (United States))
Object Type:
Article
System:
The UNT Digital Library
Vertical bridgman and gradient freeze growth of III-V compound semiconductors
Major improvements in the structural and electrical perfection of single crystals of III-V compound semiconductors have been achieved by using new vertical Bridgman-type and vertical gradient freeze techniques. A general review of experimental set-ups used for growth of large diameter crystals of GaP, InP and GaAs is presented. Crystal properties and characteristic features are discussed to illustrate advantages and disadvantages of the vertical Bridgman-type growth techniques. 22 refs., 5 figs.
Date:
July 1, 1990
Creator:
Bourret, E.D.
Object Type:
Article
System:
The UNT Digital Library
Po-210 as long-term integrating radon indicator in the indoor environment
The general objective is to improve the knowledge about the transferring processes leading from airborne radon/radon daughters to embedded Po-210 in hard surfaces in the indoor environment. The specific goal of the research is to identify situations in which the surface activity of Po-210 can be used as a long-term indicator of lung cancer risk from past or future radon exposures.
Date:
July 1, 1990
Creator:
Samuelsson, C.
Object Type:
Report
System:
The UNT Digital Library
Thermally Induced Structural Changes in Coal Combustion
The effect of particle shape on char burnout is investigated in the limit of shrinking core combustion. As a first step, the particle temperature is assumed to proceed in the shrinking core regime and under conditions of negligible Stefan flow. The problem then reduces to calculating the oxygen concentration field around a non-spherical particle with the oxidation reaction taking place on the external surface. This problem has been addressed by an analytical technique and a numerical technique. An analytical technique known as domain perturbation'' was used to examine the change due to reaction in the shape of a slightly nonspherical, but axisymmetric, particle. It was found that the aspect ratio always increases with conversion, i.e., the particle becomes less spherical. A numerical technique, based on the boundary integral'' method was developed to handle the case of an axisymmetric particle with otherwise arbitrary shape. Numerical results are presented which again show the aspect ratio to increase with conversion. 8 refs.
Date:
January 17, 1990
Creator:
Gavalas, G. R. & Flagan, R. C.
Object Type:
Report
System:
The UNT Digital Library
Characterization of Nb-Ti superconductors with artificial pinning structures
A series of multifilamentary APC Nb-Ti superconductors have been made with Nb added as a normal second phase to provide flux pinning centers. Two compositions, 12.5% vol % and 25 vol % Nb in Nb-Ti, have fabricated into multifilamentary composites using two different fabrication methods. One method used hot isostatic compaction and hot extrusion thoughout the processing. The other method (bundle-and-draw process) discontinued all hot processing at an intermediate level. While the J{sub c} values of the bundle-and-draw wires are quite promising, the critical current of the extruded wires appears to be limited by poor uniformity of the filament cross-sectional area along the conductor length. The large values of the index of the resistive transition and small filament standard-deviation-to-average area ratios observed in the wires produced by the bundle-and-draw process suggest extrinsic factors have little effect on J{sub c}. The variation in J{sub c} as the wire diameter is reduced appears to be most strongly affected by intrinsic factors: Nb distribution and pinning strength. The final filament microstructure and Nb spacing are shown to be difficult to calculate, e.g., the mean Nb spacing near the final wire size may be {1/2} to 1/3 that of the calculated value. 5 refs., …
Date:
June 1, 1990
Creator:
Dietderich, D. R. & Scanlan, R. M.
Object Type:
Article
System:
The UNT Digital Library
Removal of trichloroethylene contamination from the subsurface: A comparative evaluation of different remediation strategies by means of numerical simulation
Volatile organic compounds such as petroleum hydrocarbons and halogenated hydrocarbon solvents are common contaminants of the subsurface environment. Although immiscible with water, many of these organics have large enough aqueous phase solubilities to significantly degrade the quality of groundwater with which they come in contact. In addition, many of these substances exhibit high vapor pressures, causing them to partition strongly into the gas phase in their surroundings. Because of these properties, a volatile organic compound (VOC), once introduced into the subsurface may be transported as a solute, a vapor, or as a constituent in a non- aqueous phase liquid (NAPL). This implies that at some sits, an adequate description of the migration of these contaminants in the subsurface would necessarily involve three phases, -- gas, aqueous and NAPL. For example, to design an effective aquifer remediation scheme for a site where NAPL is present, it would be wrong to focus solely on the aqueous phase while ignoring either the gas phase or the NAPL phase. In the present work, we use a simulator developed by Falta et al. (1990a), known as STMVOC,'' which models true three-phase flow in which NAPL, gas and aqueous phases can move in response to pressure, …
Date:
December 1, 1990
Creator:
Adenekan, A.E.; Pruess, K. & Falta, R.W.
Object Type:
Report
System:
The UNT Digital Library
Surface electrochemical control for fine coal and pyrite separation
Ongoing work includes the characterization of coal pyrites, the floatability evaluation typical US coal samples, the flotation behavior of coal pyrites, the electrochemical measurement of the surface properties of coal pyrites, and the characterization of species produced at pyrite surfaces.
Date:
January 1, 1990
Creator:
Hu, Weibai; Zhu, Ximeng; Bodily, D. M. & Wadsworth, M. E.
Object Type:
Report
System:
The UNT Digital Library
Biological Production of Ethanol From Coal
A batch kinetic study involving Clostridium lungdahlii in a mineral medium was carried out in order to provide baseline data for the effects of nutrients on product ratio and kinetics. The use of this minimal medium containing vitamins, minerals, select amino acids and salts showed both a lower maximum specific growth rate and a lower maximum specific uptake rate than found when using a complex medium supplemented with 0.01% yeast extract. At the same time, the product ratio was improved slightly in favor of ethanol over acetate. Future experiments will measure the effects of ammonia and phosphate limitation on product ratio and process kinetics.
Date:
January 1, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Automatic lighting controls demonstration
The purpose of this work was to demonstrate, in a real building situation, the energy and peak demand reduction capabilities of an electronically ballasted lighting control system that can utilize all types of control strategies to efficiently manage lighting. The project has demonstrated that a state-of-the-art electronically ballasted dimmable lighting system can reduce energy and lighting demand by as least 50% using various combinations of control strategies. By reducing light levels over circulation areas (tuning) and reducing after hours light levels to accommodate the less stringent lighting demands of the cleaning crew (scheduling), lighting energy consumption on weekdays was reduced an average of 54% relative to the initial condition. 10 refs., 14 figs., 3 tabs.
Date:
March 1, 1990
Creator:
Rubinstein, F. & Verderber, R.
Object Type:
Report
System:
The UNT Digital Library