The following were studied: scavenging behavior of NO/sub 3//sup -/ and methyl viologen, fluorescent lifetimes of dibromobimane and thiols, spectral determination of tricresyl borate, salicylaldehyde method for differentiation of primary and secondary amines, ammonia-gas-sensing electrodes, automated manometric CHN analyzer, computer program for calibration of graphite furnace atomic absorption spectrophotometer, contamination of alumina insulator, organic additives for stabilizing colloidal silica in hypersaline geothermal brine, x-ray fluorescence analysis of geological samples, dissolution of geothermal scale, and characterization of enzyme-catalyzed reactions (alkaline phosphatase). (DLC)

A 6000 ft/sup 2/ office building is described which uses 820 ft/sup 2/ of concentrating, tracking solar collectors for domestic water heating and part of the space heating. The piping schematic, major maintenance and construction problems, system performance data, acceptance test, and operation and maintenance manual are included. (MHR)

Described is a computer-based gamma ray spectrometer system using a germanium detector for rapid nondestructive measurement of isotopic and total plutonium concentrations in solutions at nuclear reprocessing plants. Isotopic concentrations have been measured with an accuracy of +-0.5%. Cell design, calibration techniques, and preliminary results are discussed. This system is being installed at the Tokai reprocessing plant in Japan.

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: Assignment to the United States of rights under loans deemed uncollectible under the National Defense Direct Student Loans program.