Laboratory studies indicate that tritiated water measurements of water flux are accurate to within -7 to +4% in mammals, but errors are larger in some reptiles. However, under conditions that can occur in field studies, errors may be much greater. Influx of environmental water vapor via lungs and skin can cause errors exceeding +-50% in some circumstances. If water flux rates in an animal vary through time, errors approach +-15% in extreme situations, but are near +-3% in more typical circumstances. Errors due to fractional evaporation of tritiated water may approach -9%. This error probably varies between species. Use of an inappropriate equation for calculating water flux from isotope data can cause errors exceeding +-100%. The following sources of error are either negligible or avoidable: use of isotope dilution space as a measure of body water volume, loss of nonaqueous tritium bound to excreta, binding of tritium with nonaqueous substances in the body, radiation toxicity effects, and small analytical errors in isotope measurements. Water flux rates measured with tritiated water should be within +-10% of actual flux rates in most situations.

Laboratory validation studies indicate that doubly labeled water (/sup 3/HH/sup 18/O and /sup 2/HH/sup 18/O) measurements of CO/sub 2/ production are accurate to within +-9% in nine species of mammals and reptiles, a bird, and an insect. However, in field studies, errors can be much larger under certain circumstances. Isotopic fraction of labeled water can cause large errors in animals whose evaporative water loss comprises a major proportion of total water efflux. Input of CO/sub 2/ across lungs and skin caused errors exceeding +80% in kangaroo rats exposed to air containing 3.4% unlabeled CO/sub 2/. Analytical errors of +-1% in isotope concentrations can cause calculated rates of CO/sub 2/ production to contain errors exceeding +-70% in some circumstances. These occur: 1) when little decline in isotope concentractions has occured during the measurement period; 2) when final isotope concentrations closely approach background levels; and 3) when the rate of water flux in an animal is high relative to its rate of CO/sub 2/ production. The following sources of error are probably negligible in most situations: 1) use of an inappropriate equation for calculating CO/sub 2/ production, 2) variations in rates of water or CO/sub 2/ flux through time, 3) use of …

This report summarizes a somewhat diverse set of theoretical studies carried out in 1978 which were aimed at increasing our understanding of the physics of multiple-beam overlap and enhanced deposition in thin foils. The studies reported here involve electron and ion beam overlap in single and multiple cylindrical disks of channels, and single and multiple electron-beam deposition in thin foils. Some of the important consequences of these studies which affect ongoing research are the scaling formula derived for overlap current density gain in cylindrical geometry, an understanding of the importance of electron drift motion in thin-foil-enhanced deposition, and the necessity of providing non-axial return current paths and magnetic isolation of disks in multiple-disk configurations.

Manganese monophosphide and other first row transition metal phosphides have been studied by x-ray photoelectron spectroscopy. Electron bindng energies of both valence-conduction band and core level electrons show an evolution of metallic behavior in the series ScP, TiP, VP, MnP, FeP. Phosphorus dissociation pressure measurements on MnP lead to: 4MnP/sub (s)/ = 2Mn/sub 2/P/sub (s)/ + P/sub 2(g)/ , ..delta..H/sup 0//sub 298/ /sub 15/ = 69.8 kcal when the data are treated by the third law method using estimated entropies. Combination of this result with published data yields ..delta..H/sup 0//sub f,298.15/(MnP) = -27.2 kcal/mole which is in satisfactory agreement with the published value of -23.0 kcal/mole. The apparently low value of the atomization enthalpy of MnP is confirmed and is attributed to a high valence state preparation energy.

Appendices containing supplementary geological data of the Basin Creek-Yankee Fork area, including radioactivity measurements, locations of geochemical samples, and locations of paleomagnetic measurements to accompany a report on U.S. uranium resources in Custer County, Idaho.

Tables displaying index to statistical analysis and reduced data values for each quadrangle in the survey area.

Newsletter dedicated to traveling in Texas, including information about news, locations, and events of interest to visitors as well as statistics and summaries of travel in the state.

The new theory of Ostwald ripening phenomena is gradually unfolding. Based on the principle of minimum rate of entropy production, the general method including the mathematical formalisms of variational calculus, is now understood and has been applied to the case of annealing of void structures, a situation somewhat simpler to model than is particle coarsening. The resultant void distribution function is compared with that expected from the LSW theory and with experiments. Developments in three areas are described: generation and annealing of voids in HVEM, distribution of Ni/sub 3/Al in Ni-Al alloys, and production of reproducible pore structures in nickel powder compacts.

Bimonthly newsletter of the Center for Energy Studies at the University of Texas at Austin discussing activities of the Center and other energy-related news.

Quarterly financial report of the Department of Public Safety documenting income, expenditures, and other relevant financial information during fiscal year 1978-1979.

Tables displaying index to statistical analysis and reduced data values for each quadrangle in the survey area.

From abstract: The objective of the work was to define areas showing surface indications of a generally higher uranium content where detailed exploration for uranium would most likely be successful.

Volume of the 1979 update of the rail plan for Texas documenting detailed analysis of specific rail lines to determine whether the segments should be abandoned or considered for development assistance.

Volume of the 1979 update of the rail plan for Texas documenting detailed analysis of specific rail lines to determine whether the segments should be abandoned or considered for development assistance.

Volume of the 1979 update of the rail plan for Texas documenting detailed analysis of specific rail lines to determine whether the segments should be abandoned or considered for development assistance.

Volume of the 1979 update of the rail plan for Texas documenting detailed analysis of specific rail lines to determine whether the segments should be abandoned or considered for development assistance.

Volume of the 1979 update of the rail plan for Texas documenting detailed analysis of specific rail lines to determine whether the segments should be abandoned or considered for development assistance.