Pulsed magnetic welding is being evaluated as a process for welding fuel cladding to the end plug for nuclear fuel pins. A continuous metallurgical bond is required between the plug and clad because this joint must function as a gas and coolant seal for the fuel pin. An ultrasonic technique utilizing a computer controlled scanner was developed to inspect these welds. First, fuel pin specimens were profiled in the weld zone region by determining actual surface coordinates. This step eliminated variable geometry effects and guaranteed proper transducer alignment during the scanning. Second, scans were made using positional information obtained during profiling, and ultrasonic data were digitized and stored for computer analysis. Third, analysis algorithms were used to recognize unbonded regions, and total unbonded area was calculated. Finally, A-scan and C-scan plots were generated by the computer.

The addition of a photovoltaic array to a solar-heated single-family residence at the University of Texas at Arlington permits the study of combined photovoltaic/thermal system operation. Equipment and construction details are presented.

The extension of Wiener's classical mean-square filtering theory to the estimation of two-dimensional (2-D), discrete random fields is discussed. In analogy with the 1-D case, the optimal realizable filter is derived by solution of a 2-D discrete Wiener--Hopf equation using a spectral factorization procedure. Computational algorithms for performing the required calculations are discussed. 3 figures.

Various factors affecting the electrical resistivity of the pyrotechnic pressed powder TiH/sub x//KC10/sub 4/, which is sensitive to hot wire ignition yet quite spark insensitive, were evaluated. The electrical resistivity of the TiH/sub x/ and TiH/sub x//KC10/sub 4/ were correlated with their pressing pressure, stoichiometry, powder surface area, and temperature (from below liquid nitrogen temperature to 500 K). Data show resistivity increasing with x and surface area, and decreasing non-linearly with pressing pressure. It was concluded that temperature coefficient of resistivity depends upon powder surface features. In addition, it was found that electrostatic discharge lowers TiH/sub x/ and TiH/sub x//KC10/sub 4/ pellet resistivity and that the effect is larger for pellets with higher initial resistivity.

Quantitative measurement of the reactivities of methyl-substituted dibenzothiophenes, under high pressure reaction conditions (102 atm, 300/sup 0/C) representative of industrial practice, has been accomplished. The catalyst was sulfided commercial Co-Mo/..gamma..-Al/sub 2/O/sub 3/. Methyl groups in the 2 and 8 or 3 and 7 positions show little effect. Methyl groups in the 4 position, however, reduced the reactivity by an order of magnitude and methyl groups in the 4 and 6 positions reduced it somewhat more. Dibenzothiophene (DBT) was found to be self-inhibiting and results with the methyl-substituted compounds implies that there is competitive adsorption of DBT and the methyl-substituted DBT. The reaction network involving benzonaphthothiophene and hydrogen has been determined. As before, the catalyst was typical commercial cobalt molybdate (sulfided CoO-MoO/sub 3//..gamma..-Al/sub 2/O/sub 3/). The reaction conditions were 68 atm and 300/sup 0/C. The important result was that in contrast to dibenzothiophene, benzonaphthothiophene experiences extensive hydrogenation accompanying hydrodesulfurization, even with Co-Mo/..gamma..-Al/sub 2/O/sub 3/, the most selective of the available hydrodesulfurization catalysts. The sulfur-containing compounds having 3 rings or fewer experience nearly stoichiometric hydrodesulfurization (hydrogenolysis without hydrogenation), whereas the sulfur-containing compounds having 4 rings or more experience hydrogenation and hydrodesulfurization at roughly equal rates, giving products which experience further hydrogenation (and/or …

Studies of competing hydroprocessing reactions catalyzed by Ni-Mo/..gamma..-Al/sub 2/O/sub 3/ and involving quinoline, indole, dibenzothiophene, and naphthalene in n-hexadecane show that marked interactions exist. The naphthalene hydrogenation rate is markedly reduced by the presence of quinoline; whereas the reactivity of quinoline is virtually unchanged by the presence of naphthalene. Similarly the rate of hydrodenitrogenation of indole, a non-basic nitrogen-containing compounds is strongly reduced by the presence of quinoline, whereas the rate of hydro-denitrogenation of quinoline, a basic nitrogen-containing compound, is unaffected by the presence of indole. The hydrogenation reactions in the dibenzothiophene reaction network are inhibited severely as indicated by the reduction in their pseudo first-order-rate constants as are the hydrogenation reactions for naphthalene. Thus the hydrogenation rate is reduced 30-fold by increasing the initial quinoline concentration from 0.0 to 0.5 wt % in naphthalene hydrogenation and in dibenzothiophene hydrodesulfurzation. The rate of direct sulfur removal is reduced by only 3-fold by increasing the quinoline concentration from 0.0 to 0.5 wt %. These results clearly show that the rate expressions for the hydrotreating reactions are of the form given in the text.

A technique was developed for making large-area boron and carbon scatterers or filters for use on nuclear field experiments and in the ion accelerator/subkilovolt x-ray facility in the Lawrence Livermore Laboratory. These scatterers and filters were made by spraying a mixture of boron in ethyl alcohol or of carbon in isopropyl alcohol on a backing material of 0.00185-cm polyethylene (-CH/sub 2/CH/sub 2/-). In place of the polyethelene, any suitable backing material can be used.

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, Mark White, regarding a legal question submitted for clarification; Whether the Department of Human Resources and a county which jointly operate an infant adoption program may charge fees.

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.