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Synthesis and preliminary in vivo toxicity evaluation of an iodinated sulfidoborate
An iodine-labeled {sup 10}B-carrier would enable the biodistribution of {sup 10}B to be imaged noninvasively in patients so as to optimize the timing of neutron exposure for BNCT. While Na{sub 2}B{sub l2}H{sub 11}SH [BSH] is in clinical use for BNCT in Japan, its disulfido dimer Na{sub 4}B{sub 24}H{sub 22}S{sub 2} [BSSB] is also under consideration. We describe the synthesis of an iodinated product of the dimer for possible use in BNCT and compare its toxicity in normal mice to that of BSSB. Periodination of BSSB can be carried out under reaction conditions similar to those used for B{sub 12}H{sup 12}{sup {minus}2}. We surmise from this preliminary in vivo experiment that IBSSB may be slightly hepatotoxic to mice. Since the putative weight ratio of iodine to boron-10 in IBSSB is 11.5, the presence of a therapeutically adequate concentration of {sup 10}B in tumor, for example 30 {mu}g {sup 10}B per gram tumor, would be associated with 345 {mu}g I per gram tumor. This would be suitable for imaging a tumor in the brain and for quantifying the iodine using computed tomography [CT] without using conventional contrast enhancement. {sup 10}B concentrations useful for BNCT of malignant gliomas should be readily quantified by …
Date:
December 31, 1992
Creator:
Miura, M.; Micca, P. L.; Heinrichs, J. C. & Slatkin, D. N.
Object Type:
Article
System:
The UNT Digital Library
Synthesis of iron based hydrocracking catalysts
Disclosed are method of preparing a fine particle iron based hydrocracking catalyst and the catalyst prepared thereby. An iron (III) oxide powder and elemental sulfur are reacted with a liquid hydrogen donor having a hydroaromatic structure present in the range of from about 5 to about 50 times the weight of iron (III) oxide at 180C to 240C for 0 to 8 hours. Various specific hydrogen donors are disclosed. The catalysts are active at low temperature (<350C) and low pressure.
Date:
December 31, 1992
Creator:
Farcasiu, M.; Eldredge, P. A. & Ladner, E. P.
Object Type:
Patent
System:
The UNT Digital Library
System and method to improve the power output and longetivity of a radioisotope thermoelectric generator
By using the helium generated by the alpha emissions of a thermoelectric generator during space travel for cooling the thermal degradation of the thermoelectric generator can be slowed. Slowing degradation allows missions to be longer with little additional expense or payload.
Date:
December 31, 1992
Creator:
Mowery, A. L., Jr.
Object Type:
Patent
System:
The UNT Digital Library
System to inject steam and produce oil from the same wellbore through downhole valve switching. Second quarterly report
A market analysis for the Downhole Valves and associated hardware in California has shown that the main effort should be concentrated on the second case studied in the First Quarter Report, namely that of re-entry into a thermal well equipped with a 7 in. casing. An improved design,based on the use of a combination of a sliding sleeve valve with two plugs (all of them operated by wireline) is the most flexible and lowest cost configuration,for entering the largest market in California,that of existing vertical wells penetrating a relatively thin ({le} 40 ft) reservoir. At present oil prices at the California refineries, these wells, operated under cyclic steam injection are barely economic. They could become much more productive with the addition of a pair of small-diameter horizontal drainholes. A low-cost work-over program with all drilling and completion operations done through the 2 7/8 in. production tubing has been designed. Laboratory tests have confirmed the operability of the modified sliding sleeve valve with steam at temperatures ranging up to 500 F. Calculations have also determined the steam quality improvements resulting from using a low-cost Silicate foam insulation on the 2 3/8 in. steam tubing, with the 7 in. casing/tubings annulus filled …
Date:
December 31, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Talco Times (Talco, Tex.), Vol. 57, No. 44, Ed. 1 Thursday, December 31, 1992
Weekly newspaper from Talco, Texas that includes local, state, and national news along with advertising.
Date:
December 31, 1992
Creator:
Nichols, Thomas & Nichols, Nanalee
Object Type:
Newspaper
System:
The Portal to Texas History
The Teague Chronicle (Teague, Tex.), Vol. 86, No. 31, Ed. 1 Thursday, December 31, 1992
Weekly newspaper from Teague, Texas that includes local, state, and national news along with advertising.
Date:
December 31, 1992
Creator:
Massey, Steve
Object Type:
Newspaper
System:
The Portal to Texas History
Technical basis for acceptance criteria on the susceptibility of digital systems to electromagnetic interference
This paper discusses the development of the technical basis for establishing acceptance criteria on the susceptibility of digital systems to electromagnetic interference (EMI). The effort is sponsored by the US Nuclear Regulatory Commission and stems from the safety-related issues that need to be addressed with the application of digital instrumentation and controls systems in nuclear power plants. Designers of digital circuits are incorporating increasingly higher clock frequencies and lower logic voltage levels, thereby leading to the risk of susceptibility when spurious interference is misinterpreted as legitimate logic. Development of the technical basis for acceptance criteria centers around establishing good engineering practices to ensure that sufficient levels of electromagnetic compatibility (EMC) are maintained between the nuclear power plant`s electronic and electromechanical systems. First, good EMC design and installation practices are needed to control the emissions from interference sources and their impact on other nearby circuits and systems. Then, a test and evaluation program is needed to outline the EMI tests to be performed, the associated test methods to be followed, and adequate test limits to ensure that the circuit or system under test meets the recommended guidelines. Test and evaluation should be followed by periodic maintenance to assess whether the recommended …
Date:
December 31, 1992
Creator:
Ewing, P. D.; Korsah, K. & Antonescu, C.
Object Type:
Article
System:
The UNT Digital Library
Technique to eliminate helium induced weld cracking in stainless steels
Experiments have shown that Type 316 stainless steel is susceptible to heat-affected-zone (HAZ) cracking upon cooling when welded using the gas tungsten arc (GTA) process under lateral constraint. The cracking has been hypothesized to be caused by stress-assisted helium bubble growth and rupture at grain boundaries. This study utilized an experimental welding setup which enabled different compressive stresses to be applied to the plates during welding. Autogenous GTA welds were produced in Type 316 stainless steel doped with 256 appm helium. The application of a compressive stress, 55 Mpa, during welding suppressed the previously observed catastrophic cracking. Detailed examinations conducted after welding showed a dramatic change in helium bubble morphology. Grain boundary bubble growth along directions parallel to the weld was suppressed. Results suggest that stress-modified welding techniques may be used to suppress or eliminate helium-induced cracking during joining of irradiated materials.
Date:
December 31, 1992
Creator:
Wang, Chin-An; Chin, B. A. & Grossbeck, M. L.
Object Type:
Article
System:
The UNT Digital Library
Technology development and commercialization of the RENUGAS{reg_sign} process
None
Date:
December 31, 1992
Creator:
Gissy, J.; Knight, R. A.; Onischak, M.; Carty, R. H. & Babu, S. P.
Object Type:
Article
System:
The UNT Digital Library
Technology development for iron Fischer-Tropsch catalysts. Quarterly technical progress report for period ending December 30, 1992
The impact on iron Fischer-Tropsch catalysts of the variables controlling the initial precipitation, subsequent aging and drying conditions have been detailed. Heat treatment of iron oxyhydroxides results in decreasing the surface area and increasing the major pore size as temperature increases, both in air and in an inert atmosphere. A shift toward higher temperature stability is seen for the same iron oxyhydroxide when co-precipitated with 6% Al{sub 2}O{sub 3}, SiO{sub 2}, or ZrO{sub 2}. Samples for characterization have been withdrawn from the reactor at increasing time intervals during pretreatment and exposure to synthesis gas. Surface area decrease and pore size increase are also observed during reaction pretreatment with CO at 260{degrees}C and 100 psi. and during the initial days of reaction under CO/H{sub 2}. The major changes appear to occur during pretreatment and in the very early stages of the reaction. The effects of added promoter(s) also impact the area and/or porosity of the materials. The area and pore size distributions have shown systematic changes during increasing exposure to synthesis gas.
Date:
December 31, 1992
Creator:
Milburn, D. R.; O`Brien, R. J.; Chary, K. & Davis, B. H.
Object Type:
Report
System:
The UNT Digital Library
Technology development for iron Fischer-Tropsch catalysts. Technical progress report No. 6, December 26, 1991--March 31, 1992
The objective of this contract are to develop a technology for the production of active and stable iron Fischer-Tropsch catalysts for use in slurry-phase synthesis reactors and to develop a scaleup procedure for large-scale synthesis of such catalysts for process development and long-term testing in slurry bubble-column reactors. With a feed containing H{sub 2} and CO in the molar ratio of 0.5 to 1.0 to the slurry bubble-column reactor, the catalyst performance target is 88% CO + H{sub 2} conversion at a minimum space velocity of 2.4 NL/hr/gFe. The desired sum of methane and ethane selectivities is no more than 4%, and the conversion loss per week is not to exceed 1%. Contract Tasks are as follows: 1.0--Catalyst development, 1.1--Technology assessment, 1.2--Precipitated catalyst preparation method development, 1.3--Novel catalyst preparation methods investigation, 1.4--Catalyst pretreatment, 1.5--Catalyst characterization, 2.0--Catalyst testing, 3.0--Catalyst aging studies, and 4.0--Preliminary design and cost estimate of a catalyst synthesis facility. This paper reports progress made on catalyst development.
Date:
December 31, 1992
Creator:
Frame, R. R. & Gala, H. B.
Object Type:
Report
System:
The UNT Digital Library
Technology development for iron Fischer-Tropsch catalysts. Technical progress report No. 7, April 1, 1992--June 30, 1992
The objective of this contract are to develop a technology for the production of active and stable iron Fischer-Tropsch catalysts for use in slurry-phase synthesis reactors and to develop a scaleup procedure for large-scale synthesis of such catalysts for process development and long-term testing in slurry bubble-column reactors. With a feed containing H{sub 2} and CO in the molar ratio of 0.5 to 1.0 to the slurry bubble-column reactor, the catalyst performance target is 88% CO + H{sub 2} conversion at a minimum space velocity of 2.4 NL/hr/gFe. The desired sum of methane and ethane selectivities is no more than 4%, and the conversion loss per week is not to exceed 1%. Contract Tasks are as follows: 1.0--Catalyst development, 1.1--Technology assessment, 1.2--Precipitated catalyst preparation method development, 1.3--Novel catalyst preparation methods investigation, 1.4--Catalyst pretreatment, 1.5--Catalyst characterization, 2.0--Catalyst testing, 3.0--Catalyst aging studies, and 4.0--Preliminary design and cost estimate of a catalyst synthesis facility. This paper reports progress made on catalyst development.
Date:
December 31, 1992
Creator:
Frame, R. R. & Gala, H. B.
Object Type:
Report
System:
The UNT Digital Library
Technology development for iron Fischer-Tropsch catalysts. Technical progress report No. 8, July 1, 1992--September 30, 1992
The objectives of this contract are to develop a technology for the production of active and stable iron Fischer-Tropsch catalysts for use in slurry-phase synthesis reactors and to develop a scaleup procedure for large-scale synthesis of such catalysts for process development and long-term testing in slurry bubble-column reactors. With a feed containing hydrogen and carbon monoxide in the molar ratio of 0.5 to 1.0 to the slurry bubble-column reactor, the catalyst performance target is 88% CO + H{sub 2} conversion at a minimum space velocity of 2.4 NL/hr/gFe. The desired sum of methane and ethane selectivities is no more than 4%, and the conversion loss per week is not to exceed 1%. Contract Tasks are as follows: 1.0--Catalyst development, 1.1--Technology assessment, 1.2--Precipitated catalyst preparation method development, 1.3--Novel catalyst preparation methods investigation, 1.4--Catalyst pretreatment, 1.5--Catalyst characterization, 2.0--Catalyst testing, 3.0--Catalyst aging studies, and 4.0--Preliminary design and cost estimate of a catalyst synthesis facility. This paper reports progress made on Task 1.
Date:
December 31, 1992
Creator:
Frame, R. R. & Gala, H. B.
Object Type:
Report
System:
The UNT Digital Library
Technology development for iron Fischer-Tropsch catalysts. Technical progress report No. 9, September 26, 1992--December 26, 1992
The objectives of this contract are to develop a technology for the production of active and stable iron Fischer-Tropsch catalysts for use in slurry-phase synthesis reactors and to develop a scaleup procedure for large-scale synthesis of such catalysts for process development and long-term testing in slurry bubble-column reactors. With a feed containing hydrogen and carbon monoxide in the molar ratio of 0.5 to 1.0 to the slurry bubble-column reactor, the catalyst performance target is 88% CO + H{sub 2} conversion at a minimum space velocity of 2.4 NL/hr/gFe. The desired sum of methane and ethane selectivities is no more than 4%, and the conversion loss per week is not to exceed 1%. Contract Tasks are as follows: 1.0--Catalyst development, 1.1--Technology assessment, 1.2--Precipitated catalyst preparation method development, 1.3--Novel catalyst preparation methods investigation, 1.4--Catalyst pretreatment, 1.5--Catalyst characterization, 2.0--Catalyst testing, 3.0--Catalyst aging studies, and 4.0--Preliminary design and cost estimate of a catalyst synthesis facility. This paper reports progress on Task 1.3.
Date:
December 31, 1992
Creator:
Frame, R. R. & Gala, H. B.
Object Type:
Report
System:
The UNT Digital Library
A TEM study of step morphology on the non-uhv heat-treated MgO (100) surface
Preliminary results from a study of the morphology of the MgO (100) surface after chemical etching followed by heat-treatment in air are presented. Contrast arising from the surface-steps so formed is found to be strongly dependent on the deviation parameter, suggesting that many of the step-faces are not perpendicular to the (100) foil plane but are, instead, often rather shallowly inclined.
Date:
December 31, 1992
Creator:
King, S. & Carter, C. B.
Object Type:
Article
System:
The UNT Digital Library
Temperature anisotropy and rotation upgrades to the ICRF modules in SNAP and TRANSP
Fokker-Plank and transport codes have significantly better velocity-space treatment of the plasma than do the RF deposition models: FPP uses a 2 or 3D velocity space calculation, TRANSP uses Monte-Carlo particles, e.g., 3D in velocity space, many 2 and 3D spatial RF deposition codes are based on Maxwellians, with a single velocity-space parameter, i.e., the isotropic temperature. The ultimate goal of this effort was to provide the deposition codes with better velocity-space physics. For ICRH heating on TFTR, two important physics issues are velocity-space anisotropy (because of high energy tails), and plasma rotation (because of simultaneous NBI-RF heating). In addition, these two physical effects are among the suite of experimentally measurable quantities, and most of the required new formulas already exist in the literature.
Date:
December 31, 1992
Creator:
Smithe, D.N.
Object Type:
Article
System:
The UNT Digital Library
Testing double ionization mechanisms with highly-charged ions
Double ionization of He target atoms by intermediate- to high-velocity charged ions is considered in terms of two mechanisms: (1) a two-step (TS) process in which both target electrons are removed in separate direct interactions with the projectile, and (2) a one-step mechanism in which one electron is liberated in a single projectile-target interaction followed by subsequent ``shakeoff`` (SO) of the second electron. Measured double-to-single ionization ratios are used to exhibit and test the underlying mechanisms of double ionization. It is found that these ratios exhibit a high degree of universality as a function of v/q, where v is the velocity of the ion and q is its charge. The results strongly suggest that the important factor in determining the regions of validity for TS and SO is the ionic charge divided by the impact velocity and not just the impact velocity itself.
Date:
December 31, 1992
Creator:
Tanis, J. A.
Object Type:
Article
System:
The UNT Digital Library
Tests of Hercules/Ultramet CVD coatings in hot hydrogen
The effort by Hercules and Ultramet to produce CVD NbC coatings, which protect carbon-carbon substrates from hot hydrogen, has had some success but with some limitations. The coatings increase the survival time at atmospheric pressure and low flow rate of hydrogen by about a factor of 40 over uncoated graphite at 3000 K. However, the grain structure is not stable at these temperatures, and after about 10--20 minutes, the coating is subject to rapid degradation by spalling in visible chunks. Further experiments would have to be performed to determine the effects of higher pressures and flow rates, for it is not clear how these factors would affect the survival time, considering that one of the main failure mechanisms is independent of the atmosphere.
Date:
December 31, 1992
Creator:
Vanier, P. E.; Barletta, R. E.; Svandrlik, J. & Adams, J.
Object Type:
Report
System:
The UNT Digital Library
A tevatron collider beauty factory. [Final report, 1980--1992]
This document which is labeled a final report consists of several different items. The first is a proposal for a detector to be developed for beauty physics. The detector is proposed for the Fermilab Tevatron, and would be designed to measure mixing reactions, rare decay modes, and even CP violation in hadron collider beauty production. The general outline of the work proposed is given, and an estimate of the time to actually design the detector is presented, along with proposed changes to the Tevatron to accommodate the system. A preliminary report on an experiment to verify a reported observation of a 17 keV neutrino in tritium decay is presented. The present results in the decay spectra actually show a depression below expected levels, which is not consistent with a massive neutrino. Additional interest has been shown in finishing an electrostatic beta spectrometer which was started several years previously. The instrument uses hemispherical electrostatic electric fields to retard electrons emitted in tritium decay, allowing measurement of integral spectra. The design goal has a 5 eV energy resolution, which may be achievable. A new PhD student is pursuing this experiment. Also the report contains a proposal for additional work in the field …
Date:
December 31, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Texas Attorney General Opinion: DM-194
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Dan Morales, regarding a legal question submitted for clarification: Whether a home rule city may sponsor a non-profit, no-share corporation, and related questions (RQ-441)
Date:
December 31, 1992
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
Texas Jewish Post (Fort Worth, Tex.), Vol. 46, No. 53, Ed. 1 Thursday, December 31, 1992
Weekly Jewish newspaper from Fort Worth, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 31, 1992
Creator:
Wisch, J. A. & Wisch, Rene
Object Type:
Newspaper
System:
The Portal to Texas History
A theoretical analysis of the effect of uniaxial elastic strain on the critical temperature of cuprate superconductors
Factors which influence the effect of uniaxial stress and strain on the superconducting critical temperature are discussed, with emphasis on the effect of uniaxial strain on the mobile hole density of YBa{sub 2}Ci{sub 3}O{sub 7}.
Date:
December 31, 1992
Creator:
Welch, D. O. & Baetzold, R. C.
Object Type:
Article
System:
The UNT Digital Library
A theoretical and numerical study of the flow of granular materials. Quarterly report, April 1, 1992--June 30, 1992
Linearized stability equations for flow of granular materials down an inclined plane are derived for a continuum model [cf. Goodman and Cowin (1971), Rajagopal and Massoudi (1990)]. The basic flow exhibits multiplicity of solutions, one in which the volume fraction increases monotonically from the inclined plane to the free surface, and the other in which the volume fraction increases monotonically. Solutions to the basic equations were presented in the previous report. Next, we have to solve the stability equations, numerically.
Date:
December 31, 1992
Creator:
Rajagopal, K.R.
Object Type:
Report
System:
The UNT Digital Library
Theoretical Atomic Physics for Fusion. Annual Report, 1992
The understanding of electron-ion collision processes in high temperature plasmas remains a key factor in the ultimate development of nuclear fusion as a viable energy source for the nation. Our 1990--1992 research proposal delineated 3 main areas of research in electron-ion scattering theory. Summaries our 1992 efforts in each of these research areas are presented.
Date:
December 31, 1992
Creator:
Pindzola, M. S.
Object Type:
Report
System:
The UNT Digital Library