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Degree Department
Country
Year
Day
Language
Acyclonucleosides of 2-nitroimidazole and uses as diagnostic and therapeutic agents
An acyclonucleoside of nitroimidazole having the ability to specifically bind to tumor cells and useful for therapy, chemotherapy, imaging and radiosensitizing the tumor cells.
Date:
December 31, 1990
Creator:
Srivastava, Prem C. & Hasan, Ahmad
Object Type:
Patent
System:
The UNT Digital Library
Clean coal technology III (CCT III): 10 MW demonstration of gas suspension absorption. Technical progress report, October 1, 1990--December 31, 1990
This project will be the first North American demonstration of the Gas Suspension Absorption (GSA) System in its application for flue gas desulfurization. The purpose of this project is to demonstrate the high sulfur dioxide (SO{sub 2}) removal efficiency as well as the cost effectiveness of the GSA system. GSA is a novel concept for flue gas desulfurization developed by F.L. Smidth miljo (FLS miljo). The GSA system is distinguished in the European market by its low capital cost, high SO{sub 2} removal efficiency and low operating cost. The specific technical objectives of the GSA demonstration project are to: effectively demonstrate SO{sub 2} removal in excess of 90% using high sulfur US coal. Optimize recycle and design parameters to increase efficiencies of lime reagent utilization and SO{sub 2} removal. Compare removal efficiency and cost with existing Spray Dryer/Electrostatic Precipitator technology.
Date:
December 31, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Precision wire feeder for small diameter wire
This invention is comprised of a device for feeding small diameter wire having a diameter less than .04 mm (16 mil) to a welding station which includes a driving wheel for controllably applying a non-deforming driving force to the wire to move the free end of the wire towards the welding station; and a tension device such as a torque motor for constantly applying a reverse force to the wire in opposition to the driving force to keep the wire taut. 1 fig.
Date:
December 31, 1990
Creator:
Brandon, E. D.; Hooper, F. M. & Reichenbach, M. L.
Object Type:
Patent
System:
The UNT Digital Library
SiO2 Membranes for H2 Separation in Coal Gas Processing. Quarterly Progress Report, March 1, 1990--May 31, 1990
The project objectives are (1) to synthesize permselective ceramic membranes by chemical vapor deposition of SiO{sub 2} and other oxides within the walls of porous support tubes, (2) measure membrane permeability and thermal stability to various gases at 200--700{degrees}C and (3) develop a mathematical model for the chemical vapor deposition of the permselective oxide within the porous support tube.
Date:
December 31, 1990
Creator:
Gavalas, G. R.
Object Type:
Report
System:
The UNT Digital Library
A rule-based methodology for monitoring airborne radioactivity in nuclear power plants
None
Date:
December 31, 1990
Creator:
Tsoukalas, L.; Reyes-Jimenez, J. & Boshers, J. A.
Object Type:
Report
System:
The UNT Digital Library
Apportionment of multiple aerosol size distributions modes using factor analysis techniques
This research in progress is concerned with developing the capability to ojectively partition aerosol size distribution data into a small number of modes, that together explain most of the variation of the observed data. It is desired to determine from analysis in the field of the optical spectrometer data when a particular mode is present and to collect filter samples to determine the chemical composition of that mode. The results would relate aerosol size distributions to chemical composition.
Date:
December 31, 1990
Creator:
Williams, Allen
Object Type:
Report
System:
The UNT Digital Library
A backscattering spectrometry device for identifying unknown elements present in a workpiece
This invention is comprised of a backscattering spectrometry method and device for identifying and quantifying impurities in a workpiece during processing and manufacturing of that workpiece. While the workpiece is implanted with an ion beam, that same ion beam backscatters resulting from collisions with known atoms and with impurities within the workpiece. Those ions backscatter along a predetermined scattering angle and are filtered using a self-supporting filter to stop the ions with a lower energy because they collided with the known atoms of the workpiece of a smaller mass. Those ions which pass through the filter have a greater energy resulting from impact with impurities having a greater mass than the known atoms of the workpiece. A detector counts the number and measures the energy of the ions which pass through the filter. From the energy determination and knowledge of the scattering angle, a mass calculation determines the identity, and from the number and solid angle of the scattering angle, a relative concentration of the impurity is obtained.
Date:
December 31, 1990
Creator:
Doyle, Barney L. & Knapp, James A.
Object Type:
Patent
System:
The UNT Digital Library
Helium accumulation effects using bench marked 0-D model
Helium ``ash`` accumulation is a key issue relative to our ability to achieve a steady-state ignited tokamak. 1-D transport simulations using the BALDUR code have been used to examine the correlation between the global helium particle confinement time and the edge exhaust (or recycling) efficiency. This provides a way to benchmark the widely used 0-D model. In this paper, burn conditions for an ITER-like plasma with various helium edge recycling coefficients are examined.
Date:
December 31, 1990
Creator:
Hu, S. C. & Miley, G. H.
Object Type:
Article
System:
The UNT Digital Library
Pyrolysis and gasification of coal at high temperatures. Quarterly progress report No. 11, March 15, 1990--June 15, 1990
We made considerable progress towards completing the development of a thermogravimetric reactor with video microscopy imaging capabilities (TGA/VMI). The video micrOSCOPY components were designed, installed and are currently under testing. With the newly developed TGA/VNH apparatus we can directly observe macroscopic changes in the morphology of pyrolyzing particles and thermal ignitions of burning particles while simultaneously monitoring the weight of pyrolyzing or reacting samples. The systematic investigation on the effects of pyrolysis conditions and char macropore structure on char reactivity continued. Pyrolysis and gasification experiments were performed consecutively in our TGA reactor and the char reactivity patterns were measured for a wide range of temperatures (400--600{degrees}C). These conditions cover both the kinetic and the diffusion limited regimes. Our results show conclusively that chars produced at high pyrolysis heating rates (and, therefore, having a more open cellular macropore structure) are more reactive and ignite more easily than chars pyrolyzed at low heating rates. These results have been explained using theoretical models. We also investigated for the first time the effect of coal particle size and external mass transfer limitations on the reactivity patterns and ignition behavior of char particles combusted in air. Finally, we used our hot stage reactor to monitor …
Date:
December 31, 1990
Creator:
Zygourakis, K.
Object Type:
Report
System:
The UNT Digital Library
Expert system driven fuzzy control application to power reactors
For the purpose of nonlinear control and uncertainty/imprecision handling, fuzzy controllers have recently reached acclaim and increasing commercial application. The fuzzy control algorithms often require a ``supervisory`` routine that provides necessary heuristics for interface, adaptation, mode selection and other implementation issues. Performance characteristics of an on-line fuzzy controller depend strictly on the ability of such supervisory routines to manipulate the fuzzy control algorithm and enhance its control capabilities. This paper describes an expert system driven fuzzy control design application to nuclear reactor control, for the automated start-up control of the Experimental Breeder Reactor-II. The methodology is verified through computer simulations using a valid nonlinear model. The necessary heuristic decisions are identified that are vitally important for the implemention of fuzzy control in the actual plant. An expert system structure incorporating the necessary supervisory routines is discussed. The discussion also includes the possibility of synthesizing the fuzzy, exact and combined reasoning to include both inexact concepts, uncertainty and fuzziness, within the same environment.
Date:
December 31, 1990
Creator:
Tsoukalas, L. H.; Berkan, R. C.; Upadhyaya, B. R. & Uhrig, R. E.
Object Type:
Article
System:
The UNT Digital Library
Whisper gallery mirrors reflectivities from 100 {angstrom} to 500 {angstrom}
We have examined optical constants and predicted reflectivities of candidate surface coatings for whisper gallery mirrors in the extreme ultraviolet (100 {Angstrom} to 500 {Angstrom}). Previous work of Vinogradov and coworkers have identified the spectral regime near 100-150 {Angstrom} as particularly promising due to the high whisper gallery mirror reflectivities of the noble metals in the vicinity of their Cooper minima in this regime. We confirm this basic result using newer optical data, and we have sought surface materials which would extend the range over which the whisper gallery mirrors may be used: between 100 to 500 {Angstrom}. We find that substantial whisper gallery mirror reflectivities (near or greater than 50%) are predicted for a variety of elements, and that the TE peak reflection is larger than TM peak reflection by on the order of 10%. However, most of the elements which do reflect well have surfaces that are vulnerable to oxygen contamination, which seriously degrades mirror performance. A cryogenic mirror design using a dynamic solid rare gas surface which has the potential to defeat such surface contaminations is described: it has peak reflectivity of more than 50% centered near 280 {Angstrom}. 8 figs, 18 refs.
Date:
December 31, 1990
Creator:
Hung, Tsen-Yu & Hagelstein, P. L.
Object Type:
Article
System:
The UNT Digital Library
On Defining the Un-Definable: JETS
A brief summary is presented of the current status of jet studies in hadron-hadron collisions. The primary focus is on those issues that would benefit from comparisons of jet samples obtained from hadron-hadron collisions, from e{sup +}e{sup {minus}} annihilation events at LEP and from deep inelastic collisions at HERA. The important point is that, to perform this comparison properly, the jet various samples must be obtained using the same jet definition.
Date:
December 31, 1990
Creator:
Ellis, Stephen D.
Object Type:
Article
System:
The UNT Digital Library
Novel methods of copper vapor laser excitation
Microwave and intense electron beam excitation of copper vapor are being investigated to be used in copper vapor lasers for isotope separation. Both methods use copper chloride vapor by heating copper chloride. Helium was used as the buffer gas at 2 to 100 torr. In the microwave system, intense copperlines at 510 nm and 578 nm were observed. Initial electron beam results indicate that light emission follows the beam current.
Date:
December 31, 1990
Creator:
McColl, W. B.; Ching, H.; Bosch, R.; Brake, M. & Gilgenbach, R.
Object Type:
Article
System:
The UNT Digital Library
Slurry phase Fischer-Tropsch synthesis: Cobalt plus a water-gas shift catalyst. [Quarterly] report, April 1, 1990--June 30, 1990
Experiments on cobalt-catalyzed reactions of light 1-alkenes added to synthesis gas were performed. Data have been collected at 220C, 0.45 to 1.48 MPa and a synthesis gas flow rate between 0.015 and 0.030 Nl/(gcat{center_dot}min) with H{sub 2}/CO of 1.45 to 2.25. Ethylene, propene, and butene were added to synthesis gas feed from 0.5 to 1.2 mole% of total feed. For each material balance in which 1-alkenes were added, a material balance was performed at similar process conditions without 1-alkenes added, as ``base case``. Material balances without added 1-alkenes were also repeated to verify of catalyst selectivity stability. 49 material balances were performed during a single run lasting over 2,500 hours-on-stream. The hydrocarbon data have been completely analyzed; data correlations are still being made. Since C{sub 3}/C{sub 1} ratios by ethene addition, C{sub 4}/C{sub 1} ratios by propene addition, and C{sub 5}/C{sub 1} ratios by 1-butene addition, it appears that 1-alkenes may incorporate into growing chains on the surface of the catalyst. Further evidence for incorporation can be seen by comparing selectivity to n-alcohol one carbon number higher than added 1-alkene. Yield of this n-alcohol increases when alkenes are present. Sensitivity of hydrocarbon distribution to process variables seems to be greater …
Date:
December 31, 1990
Creator:
Yates, I. C. & Satterfield, C. N.
Object Type:
Report
System:
The UNT Digital Library
Robot arm apparatus
A robot arm apparatus is provided for inspecting and/or maintaining an interior of a steam generator which has an outside wall and a port for accessing the interior of the steam generator. The robot arm apparatus includes a flexible movable conduit for conveying inspection and/or maintenance apparatus from outside the steam generator to the interior of the steam generator. The flexible conduit has a terminal working end which is translated into and around the interior of the steam generator. Three motors located outside the steam generator are employed for moving the terminal working end inside the steam generator in ``x,`` ``y,`` and ``z`` directions, respectively. Commonly conducted inspection and maintenance operations include visual inspection for damaged areas, water jet lancing for cleaning sludge deposits, core boring for obtaining sludge deposits, and scrubbing of internal parts.
Date:
December 31, 1990
Creator:
Nachbar, H. D.
Object Type:
Patent
System:
The UNT Digital Library
ALARA practices to minimize occupational radiation exposure from contamination at commercial nuclear power plants
None
Date:
December 31, 1990
Creator:
Reyes-Jimenez, J. & Tsoukalas, L.
Object Type:
Report
System:
The UNT Digital Library
Method of recovering hazardous waste from phenolic resin filters
A method has been found for treating phenolic resin filter, whereby the filter is solubilized within the filter cartridge housing so the filter material can be removed from the cartridge housing in a remote manner. The invention consists of contacting the filter within the housing with an aqueous solution of about 8 to 12M nitric acid, at a temperature from about 110 to 190{degree}F, maintaining the contact for a period of time sufficient to solubilize the phenolic material within the housing, and removing the solubilized phenolic material from the housing, thereby removing the filter cartridge from the housing. Any hazardous or other waste material can then be separated from the filter material by chemical or other means.
Date:
December 31, 1990
Creator:
Meikrantz, David H.; Bourne, Gary L.; McFee, John N.; Burdge, Bradley G. & McConnell, John W., Jr.
Object Type:
Patent
System:
The UNT Digital Library
Process for the recovery of strontium from acid solutions
The invention is a process for selectively extracting strontium and technetium values from aqueous nitric acid waste solutions containing these and other fission product values. The extractant is a macrocyclic polyether in a diluent which is insoluble in water, but which will itself dissolve a small amount of water. The process will extract strontium and technetium values from nitric acid solutions which are up to 6 molar in nitric acid.
Date:
December 31, 1990
Creator:
Horwitz, E. P. & Dietz, M. L.
Object Type:
Patent
System:
The UNT Digital Library
Ash accumulation effects using bench marked 0-D model
Ash accumulation is a key issue relative to our ability to achieve D-{sup 3}He ARIES III burn conditions. 1-1/2-d transport simulations using the BALDUR code have been used to examine the correlation between the global ash particle confinement time and the edge exhaust (or recycling) efficiency. This provides a way to benchmark the widely used 0-D model. The burn conditions for an ARIES-III plasma with various ash edge recycling coefficients are examined.
Date:
December 31, 1990
Creator:
Hu, S. C.; Guo, J. P. & Miley, G. H.
Object Type:
Article
System:
The UNT Digital Library
Correlation of stability/rheology relationship with coal properties and chemical additives. Quarterly progress report, December 15, 1989--March 15, 1990
The overall objective of this project is to perform experiments to evaluate the necessary boundary conditions in the preparation and utilization of Coal Water Slurries and also develop a data base for the conceptual analysis of a prescription to predict slurry quality for a given coal candidate.
Date:
December 31, 1990
Creator:
Ohene, F.
Object Type:
Report
System:
The UNT Digital Library
Proton-proton and proton-antiproton elastic scattering at high energies: Theory, phenomenology, and experiment
This is a brief review of the progress in the understanding, during the past twenty years, of hadronic elastic scattering near the forward direction at high energies. On the basis of quantum gauge field theories, the Pomeron is found to be a branch cut above 1. Using the physical picture that this result implies, phenomenology for proton-proton and antiproton-proton elastic scattering is constructed. Two noteworthy features are that, at high energies, both the total cross section and the ratio of the integrated elastic cross section to the total cross section to the total cross section are increasing functions of the center-of-mass energy. Detailed predictions are given for the elastic differential cross sections, Coulomb interference and the ratios of the real to imaginary parts of the forward amplitudes. These predictions have been extensively and accurately confirmed by experiments, and have also been given both for future experiments on existing accelerators and for experiments on future accelerators. 14 refs., 2 figs.
Date:
December 31, 1990
Creator:
Wu, Tai Tsun
Object Type:
Article
System:
The UNT Digital Library
ORNL `90
This overview of research conducted at ORNL in 1991 presents information on the subjects of biology, physics, and the environment. Specific topics include gene mutations in kidney disease, technology assessments in thermonuclear fusion, submarine hunting technology, ozone-safe refrigerants, optical data storage via surface enhanced raman spectroscopy, and waste mitigating microbes. (GHH)
Date:
December 31, 1990
Creator:
Anderson, T.; Barnes, D. & Jefferson, J.
Object Type:
Report
System:
The UNT Digital Library
Electron beam optics for the FEL experiment and IFEL experiment
Electron beam transport system parameters for the FEL experiment and for the FEL experiment are given. The perturbation of the ``interaction region`` optics due to wiggler focussing is taken into account and a range of solutions are provided for relevant Twiss parameters in the FEL or IFEL region. Modifications of the transport optics in specific sections of the overall beam transport lines, for reasons of enhanced diagnostic capability or enhanced beam momentum analysis resolution, is also presented.
Date:
December 31, 1990
Creator:
van Steenbergen, A.
Object Type:
Report
System:
The UNT Digital Library
Glancing angle x-ray study of crystallization of amorphous Ge at the Ge-Al interface
The amorphous to crystalline transformations of Ge in Al/Ge thin film couples has been studied using glancing angle EXAFS, x-ray reflectivity and diffraction. It was found that crystallization occurs at a much lower temperature (118--150{degrees}C) than for bulk Ge, and initiates at the Al/Ge interface. X-ray diffraction studies were made at 152{degrees}C to study the kinetics of the reaction. After an initial period we find good agreement with a square root dependence of the time, characteristic of a diffusion limited reaction.
Date:
December 31, 1990
Creator:
Heald, S. M.; Jayanetti, J. K. D. & Budhani, R. C.
Object Type:
Article
System:
The UNT Digital Library