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[Letter from Julie Abel to D. Jack Davis and R. William McCarter, August 13, 1997]
A letter from Julie Abel to D. Jack Davis and R. William McCarter about informing Davis and McCarter of their approved two grants to the North Texas Institute for Educators on the Visual Arts from The Getty Center for Education on the Arts.
Date:
August 31, 1997
Creator:
Abel, Julie
Object Type:
Letter
System:
The UNT Digital Library
Mechanisms of pyrite oxidation to non-slagging species. Quarterly report, January 1--March 31, 1997
This document is the eleventh quarterly status report on a project that is concerned with enhancing the transformation of iron pyrite to non-slagging species during staged, low-NO{sub x} pulverized coal (P.C.) combustion. The research project is intended to advance PETC`s efforts to improve the technical understanding of the high-temperature chemical and physical processes involved in the utilization of coal. The work focuses on the mechanistic description and rate quantification of the effects of fuel properties and combustion environment on the oxidation of iron pyrite to form the non-slagging species magnetite. Activities during this report period were associated with the numerical encoding of the pyrite combustion model. The computer program resulting from the efforts put forth is intended to provide predictive capabilities with respect to pyrite composition during pulverized coal firing. The subroutines that have been written to track the fate of a pyrite particle of specified size and composition flowing in a gaseous environment of specified oxygen concentration, temperature, and velocity are being debugged and tested.
Date:
December 31, 1997
Creator:
Akan-Etuk, A. E. J. & Mitchell, R. E.
Object Type:
Report
System:
The UNT Digital Library
Mechanisms of pyrite oxidation to non-slagging species. Quarterly report, October 1--December 31, 1996
This document is the tenth quarterly status report on a project that is concerned with enhancing the transformation of iron pyrite to non-slagging species during staged, low-NO{sub x} pulverized coal (P.C.) combustion. The research project is intended to advance PETC`s efforts to improve the technical understanding of the high-temperature chemical and physical processes involved in the utilization of coal. The work focuses on the mechanistic description and rate quantification of the effects of fuel properties and combustion environment on the oxidation of iron pyrite to form the non-slagging species magnetite. During this report period numerical encoding of a pyrite combustion model was embarked upon. The effort was intended to lead to predictive capabilities with respect to pyrite composition during pulverized coal firing. Many subroutines were written of a FORTRAN computer program to track the fate of a pyrite particle by integrating time-dependent differential equations for species, momentum, and energy conservation. Inputs to the program include fuel-related properties such as particle size and composition, as well as properties of the reactor environment such as oxygen level, temperature, gas velocity, and a set of initial and final positions.
Date:
December 31, 1997
Creator:
Akan-Etuk, A. E. J. & Mitchell, R. E.
Object Type:
Report
System:
The UNT Digital Library
Investigation of syngas interaction in alcohol synthesis catalysts. Quarterly technical progress report, April 1, 1996--June 30, 1996
This report presents the work done on {open_quotes}Investigation of Syngas Interaction in Alcohol Synthesis Catalysts{close_quotes} during the last three months. In this report the results of the work on the metal precursors of copper, cobalt and chromium using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) are presented.
Date:
December 31, 1997
Creator:
Akundi, M. A.
Object Type:
Report
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 93, No. 87, Ed. 1 Friday, October 31, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
October 31, 1997
Creator:
Aldridge, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 93, No. 9, Ed. 1 Friday, January 31, 1997
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
January 31, 1997
Creator:
Aldridge, Leon & D'Amico, Rob
Object Type:
Newspaper
System:
The Portal to Texas History
Volatilization of heavy metals and radionuclides from soil heated in an induction ``cold`` crucible melter
The behavior of heavy metals and radionuclides during high-temperature treatment is very important for the design and operational capabilities of the off-gas treatment system, as well as for a better understanding of the nature and forms of the secondary waste. In Russia, a process for high-temperature melting in an induction heated cold crucible system is being studied for vitrification of Low Level Waste (LLW) flyash and SYNROC production with simulated high level waste (HLW). This work was done as part of a Department of Energy (DOE) funded research project for thermal treatment of mixed low level waste (LLW). Soil spiked with heavy metals (Cd, Pb) and radionuclides (Cs-137, U-239, Pu-239) was used as a waste surrogate. The soil was melted in an experimental lab-scale system that consisted of a high-frequency generator (1.76 MHz, 60 kW), a cold crucible melter (300 mm high and 90 mm in diameter), a shield box, and an off-gas system. The process temperature was 1,350--1,400 C. Graphite and silicon carbide were used as sacrificial conductive materials to start heating and initial melting of the soil batch. The off-gas system was designed in such a manner that after each experiment, it can be disconnected to collect and …
Date:
December 31, 1997
Creator:
Aloy, A. S.; Belov, V. Z.; Trofimenko, A. S.; Dmitriev, S. A.; Stefanovsky, S. V.; Gombert, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Test plan: the Czechowice Oil Refinery bioremediation demonstration of a process waste lagoon
The remediation strategies that will be applied at the Czechowice Oil Refinery waste lagoon in Czechowice, Poland are designed, managed, and implemented under the direction of the Westinghouse Savannah River Company (WSRC) for the United States Department of Energy (DOE). WSRC will be assisted in the demonstration by The Institute for Ecology of Industrial Areas (IETU). This collaboration between IETU and DOE will provide the basis for international technology transfer of new and innovative remediation technologies that can be applied in Poland and the Eastern European Region as well.
Date:
March 31, 1997
Creator:
Altman, D. J.; Lombard, K. H. & Hazen, T. C.
Object Type:
Report
System:
The UNT Digital Library
Assessment of PCFBC Field-Exposed Advanced Candle Filters
None
Date:
March 31, 1997
Creator:
Alvin, M. A.; Lippert, T. E. & Diaz, E. S.
Object Type:
Report
System:
The UNT Digital Library
The Mass-8 Experiment -- Measuring the [Beta]-[Alpha] Angular Correlations
The objective of the Mass-8 experiment is to perform a precision test of the conservation of the vector current hypothesis and a search for second class currents. The authors present preliminary data on the correlation coefficients of the {beta}-{alpha} angular correlations of the {beta}-delayed {alpha}-decays of {sup 8}Li and {sup 8}B.
Date:
December 31, 1997
Creator:
Amsbaugh, J. F.; Beck, M.; de Braeckeleer, L.; Storm, D. W.; Swanson, E.; Swartz, K. B. et al.
Object Type:
Report
System:
The UNT Digital Library
Benefits of rapid solidification processing of modified LaNi{sub 5} alloys by high pressure gas atomization for battery applications
A high pressure gas atomization approach to rapid solidification has been employed to investigate simplified processing of Sn modified LaNi{sub 5} powders that can be used for advanced Ni/metal hydride (Ni/MH) batteries. The current industrial practice involves casting large ingots followed by annealing and grinding and utilizes a complex and costly alloy design. This investigation is an attempt to produce powders for battery cathode fabrication that can be used in an as-atomized condition without annealing or grinding. Both Ar and He atomization gas were tried to investigate rapid solidification effects. Sn alloy additions were tested to promote subambient pressure absorption/desorption of hydrogen at ambient temperature. The resulting fine, spherical powders were subject to microstructural analysis, hydrogen gas cycling, and annealing experiments to evaluate suitability for Ni/MH battery applications. The results demonstrate that a brief anneal is required to homogenize the as-solidified microstructure of both Ar and He atomized powders and to achieve a suitable hydrogen absorption behavior. The Sn addition also appears to suppress cracking during hydrogen gas phase cycling in particles smaller than about 25 {micro}m. These results suggest that direct powder processing of a LaNi{sub 5{minus}x}Sn{sub x} alloy has potential application in rechargeable Ni/MH batteries.
Date:
December 31, 1997
Creator:
Anderson, I.E.; Pecharsky, V.K.; Ting, J.; Witham, C. & Bowman, R.C.
Object Type:
Report
System:
The UNT Digital Library
Corrosion Resistance of Various High Chromium Alloys in Simulated Chemical Processing Nuclear Plant Waste Solutions
High chromium nickel alloys were tested at the Idaho Chemical Processing Plant (ICPP) to determine their corrosion performance in the high temperature aggressive chemical environments of liquid waste evaporators used in the chemical reprocessing of irradiated nuclear fuels. The results of these tests, which included a variety of base metal alloys I weld filler material combinations, are presented and discussed.
Date:
December 31, 1997
Creator:
Anderson, P. A. & Agarwal, D. C.
Object Type:
Report
System:
The UNT Digital Library
Glass formulation development and testing for the vitrification of cesium-loaded crystalline silicotitanate (CST)
Crystalline Silicotitanate (CST) is an inorganic ion exchange medium that was designed to sorb Cs-137, Sr-90 and several other radionuclides. CST exhibits high selectivity for the ion exchange of cesium from highly alkaline solutions containing large quantities of sodium. Through the Tanks Focus Area (TFA), Oak Ridge National Laboratory (ORNL) was funded to demonstrate the effectiveness of CST as an ion exchange material using supernate from the Melton Valley Storage Tanks (MVST). After processing the supernate through columns containing CST, the CST will be sluiced into drums and dewatered. Some of the CST will be shipped to the Savannah River Technology Center (SRTC) to demonstrate vitrification of the cesium-loaded CST in the shielded cells facility of SRTC. Vitrification is considered to be the Best Demonstrated Available Technology for immobilization of high-level waste and is currently being investigated for the treatment of low-level/mixed wastes. Vitrification of cesium-loaded CST offers a number of benefits. Vitrification: (1) is less expensive than many of the technologies available; (2) offers a large volume reduction; (3) produces a waste form that is very durable; (4) is an established technology; (5) can be used for a wide variety of waste streams; and (6) produces a waste form …
Date:
December 31, 1997
Creator:
Andrews, M.K.
Object Type:
Article
System:
The UNT Digital Library
University Press (Beaumont, Tex.), Vol. 74, No. 18, Ed. 1 Friday, October 31, 1997
Semiweekly newspaper from Lamar University in Beaumont, Texas that includes local, national, and campus news along with advertising.
Date:
October 31, 1997
Creator:
Andris, Tonya
Object Type:
Newspaper
System:
The Portal to Texas History
Development of an atmospheric model based on a generalized vertical coordinate. Final report, September 12, 1991--August 31, 1997
There are great conceptual advantages in the use of an isentropic vertical coordinate in atmospheric models. Design of such a model, however, requires to overcome computational problems due to intersection of coordinate surfaces with the earth`s surface. Under this project, the authors have completed the development of a model based on a generalized vertical coordinate, {zeta} = F({Theta}, p, p{sub s}), in which an isentropic coordinate can be combined with a terrain-following {sigma}-coordinate a smooth transition between the two. One of the key issues in developing such a model is to satisfy the consistency between the predictions of pressure and potential temperature. In the model, the consistency is satisfied by the use of an equation that determines the vertical mass flux. A procedure to properly choose {zeta} = F({Theta}, p, p{sub s}) is also developed, which guarantees that {zeta} is a monotonic function of height even when unstable stratification occurs. There are two versions of the model constructed in parallel: one is the middle-latitude {beta}-plane version and the other is the global version. Both of these versions include moisture prediction, relaxed large-scale condensation and relaxed moist-convective adjustment schemes. A well-mixed planetary boundary layer (PBL) is also added.
Date:
December 31, 1997
Creator:
Arakawa, Akio & Konor, Celal S.
Object Type:
Report
System:
The UNT Digital Library
Atmospheric fluidized bed combustion for small scale market sectors. Final report
The objective of this project was to demonstrate and promote the commercialization of coal-fired atmospheric fluidized bed combustion (AFBC) systems, with limestone addition for SO{sub 2} emissions control and a baghouse for particulate emissions control. This AFBC system was targeted for small scale industrial-commercial-institutional space and process heat applications. A cost effective and environmentally acceptable AFBC technology in this size range would displace a considerable amount of gas/oil with coal while resulting in significant total cost savings to the owner/operators. In the Proof-of-Concept Phase, a 2.2 x 10{sup 6} Btu/hr unit was installed and successfully operated at Cedar Lane Farms (CLF), a commercial nursery in Ohio. The heat from the fluidized bed was used to heat hot water which was recirculated through greenhouses for cool weather heating. The system was designed to be fully automated with minimal operator attention required. The AFBC system installed at CLF was an improved design that incorporated flyash/sorbent reinjection and an underbed feed system to improve limestone utilization. With these additions it was possible to lower the Ca/S ratio from {approximately} 3.0 to 2.0, and still maintain an SO{sub 2} emissions level of 1.2 lb/10{sup 6} Btu when burning the same high sulfur Ohio coal …
Date:
March 31, 1997
Creator:
Ashworth, R. A.; Plessinger, D. A.; Sommer, T. M.; Keener, H. M. & Webner, R. L.
Object Type:
Report
System:
The UNT Digital Library
AFBC-HAGT, an efficient small scale power plant
A team comprised of the Energy and Environmental Research Corporation (EER), the Will-Burt Company, and the Ohio Agricultural Research and Development Center (OARDC) designed installed and tested a pilot scale atmospheric fluidized (bubbling) bed combustion (AFBC) system to heat hot water. Following testing, a commercial prototype unit was installed at Cedar Lane Farms (CLF), near Wooster, Ohio. The unit was started up in January, 1995, and is currently in operation. It provides hot water for greenhouse heating, requiring about two hours per day of operator attention. The development was funded by the Ohio Coal Development Office, the U.S. Department of Energy, and the team members. Based on the success of the prototype operation a commercial size unit was recently designed for hot water heating use. This small scale AFBC system can be designed not only to produce hot water or steam but also to efficiently generate electricity (60 kWe to 3.5 MWe size range). Most small scale fluidized bed systems use in-bed heat transfer tubes to generate saturated steam which can then be superheated and fed to a steam turbine for electrical power generation. This AFBC has no internal heat transfer surfaces. It can be combined with an air heater …
Date:
December 31, 1997
Creator:
Ashworth, Robert A.; Webner, Rodney L. & Keener, Harold M.
Object Type:
Article
System:
The UNT Digital Library
Transient Solid Dynamics Simulations on the Sandia/Intel Teraflop Computer
Transient solid dynamics simulations are among the most widely used engineering calculations. Industrial applications include vehicle crashworthiness studies, metal forging, and powder compaction prior to sintering. These calculations are also critical to defense applications including safety studies and weapons simulations. The practical importance of these calculations and their computational intensiveness make them natural candidates for parallelization. This has proved to be difficult, and existing implementations fail to scale to more than a few dozen processors. In this paper we describe our parallelization of PRONTO, Sandia`s transient solid dynamics code, via a novel algorithmic approach that utilizes multiple decompositions for different key segments of the computations, including the material contact calculation. This latter calculation is notoriously difficult to perform well in parallel, because it involves dynamically changing geometry, global searches for elements in contact, and unstructured communications among the compute nodes. Our approach scales to at least 3600 compute nodes of the Sandia/Intel Teraflop computer (the largest set of nodes to which we have had access to date) on problems involving millions of finite elements. On this machine we can simulate models using more than ten- million elements in a few tenths of a second per timestep, and solve problems more …
Date:
December 31, 1997
Creator:
Attaway, S.; Brown, K.; Gardner, D.; Hendrickson, B. & Barragy, T.
Object Type:
Article
System:
The UNT Digital Library
U.S. Army weapon systems human-computer interface style guide. Version 2
A stated goal of the US Army has been the standardization of the human computer interfaces (HCIs) of its system. Some of the tools being used to accomplish this standardization are HCI design guidelines and style guides. Currently, the Army is employing a number of HCI design guidance documents. While these style guides provide good guidance for the command, control, communications, computers, and intelligence (C4I) domain, they do not necessarily represent the more unique requirements of the Army`s real time and near-real time (RT/NRT) weapon systems. The Office of the Director of Information for Command, Control, Communications, and Computers (DISC4), in conjunction with the Weapon Systems Technical Architecture Working Group (WSTAWG), recognized this need as part of their activities to revise the Army Technical Architecture (ATA), now termed the Joint Technical Architecture-Army (JTA-A). To address this need, DISC4 tasked the Pacific Northwest National Laboratory (PNNL) to develop an Army weapon systems unique HCI style guide, which resulted in the US Army Weapon Systems Human-Computer Interface (WSHCI) Style Guide Version 1. Based on feedback from the user community, DISC4 further tasked PNNL to revise Version 1 and publish Version 2. The intent was to update some of the research and incorporate …
Date:
December 31, 1997
Creator:
Avery, L.W.; O`Mara, P.A.; Shepard, A.P. & Donohoo, D.T.
Object Type:
Report
System:
The UNT Digital Library
183-H Solar Evaporation Basins PostClosure Plan
The 183-H Solar Evaporation Basins (183-H) have certified closure under a modified closure option available in the Hanford Facility Dangerous Waste Permit under Condition II.K.3. The following information contains a description of the unit, past closure actions, and postclosure care requirements subject to compliance under the Permit. Corrective actions required for dangerous waste constituents remaining at 183-H will occur in conjunction with Comprehensive Environmental Response, Compensation, and Liability Act remedial actions for the 100-HR-1 Source Operable Unit and the 100-HR-3 Groundwater Operable Unit
Date:
December 31, 1997
Creator:
Badden, J.W.
Object Type:
Report
System:
The UNT Digital Library
Unimolecular reaction dynamics of well characterized ionic reactions. Final report, 1993--1997
The dissociation dynamics of well characterized and energy selected ions have been investigated by photoelectron photoion coincidence (PEPICO) spectrometry. A number of ions have been found which dissociate in competition with isomerization and which thus lead to multi-component decay rates. The dissociation dynamics on such complex potential energy surfaces are common for many free radical reactions, including some of importance to combustion processes. Individual reaction rates for isomerization and dissociation have been extracted from the data. In addition, all rates have been successfully modeled with the RRKM theory in combination with ab initio molecular orbital calculations. The dissociation dynamics of a dimer ion system has been studied on the UNC PEPICO apparatus as well as at the Chemical Dynamics Beam line of the ALS. This proof of principle experiment shows that it is possible to investigate such systems and to determine the heats of formation of free radicals by this approach. Finally, a dissociation involving a loose transition state with no exit barrier has been successfully modeled with a simplified version of the variational transition state theory (VTST). The aim of all of these studies is to develop protocols for modeling moderately complex unimolecular reactions with simple models.
Date:
December 31, 1997
Creator:
Baer, T.
Object Type:
Report
System:
The UNT Digital Library
Resonance Interference and Absolute Cross Sections in Near-Threshold Electron-Impact Excitation of Multicharged Ions
Strong resonance features were observed in near-threshold excitation of {sup 1}S right arrow {sup 3}P intercombination transitions in Si(2+), Ar(6+), and Kr(6+). Such resonances are predicted to dominate over direct excitation by more than an order of magnitude in the threshold region. Absolute cross sections were measured by using the merged electron-ion beams energy loss technique. The results are compared with R-matrix close-coupling (CCR) theory for all of the ions. Several discrepancies in resonance positions and magnitudes exist between experiment and theory for these spin forbidden transitions.
Date:
December 31, 1997
Creator:
Bannister, M. E.; Chung, Y. S.; Djuric, N.; Wallbank, B.; Woitke, O.; Zhou, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Design considerations for neutron activation and neutron source strength monitors for ITER
The International Thermonuclear Experimental Reactor will require highly accurate measurements of fusion power production in time, space, and energy. Spectrometers in the neutron camera could do it all, but experience has taught us that multiple methods with redundancy and complementary uncertainties are needed. Previously, conceptual designs have been presented for time-integrated neutron activation and time-dependent neutron source strength monitors, both of which will be important parts of the integrated suite of neutron diagnostics for this purpose. The primary goals of the neutron activation system are: to maintain a robust relative measure of fusion energy production with stability and wide dynamic range; to enable an accurate absolute calibration of fusion power using neutronic techniques as successfully demonstrated on JET and TFTR; and to provide a flexible system for materials testing. The greatest difficulty is that the irradiation locations need to be close to plasma with a wide field of view. The routing of the pneumatic system is difficult because of minimum radius of curvature requirements and because of the careful need for containment of the tritium and activated air. The neutron source strength system needs to provide real-time source strength vs. time with {approximately}1 ms resolution and wide dynamic range in …
Date:
December 31, 1997
Creator:
Barnes, C. W.; Jassby, D. L.; LeMunyan, G.; Roquemore, A. L. & Walker, C.
Object Type:
Article
System:
The UNT Digital Library
News Bulletin (Castroville, Tex.), Vol. 38, No. 31, Ed. 1 Thursday, July 31, 1997
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
July 31, 1997
Creator:
Barnes, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History