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The objective of the Vee-Trough/Vacuum Tube Collector (VTVTC) Project was to prove the usefulness of vee-trough concentrators in improving the efficiency and reducing the cost of collectors assembled from evacuated tube receivers. The VTVTC was analyzed rigorously and various mathematical models were developed to calculate the optical performance of the vee-trough concentrator and the thermal performance of the evacuated tube receiver. A test bed was constructed to verify the mathematical analyses and compare reflectors made out of glass, Alzak and aluminized FEP Teflon. Tests were run at temperatures ranging from 95 to 180/sup 0/C during the months of April, May, June, July and August 1977. Vee-trough collector efficiencies of 35 to 40% were observed at an operating temperature of about 175/sup 0/C. Test results compared well with the calculated values. Test data covering a complete day are presented for selected dates throughout the test season. Predicted daily useful heat collection and efficiency values are presented for a year's duration at operation temperatures ranging from 65 to 230/sup 0/C. Estimated collector costs and resulting thermal energy costs are presented. Analytical and experimental results are discussed along with a complete economic evaulation. Recommendations for the continuation of the project are presented.

From operational program: This final report includes a general geologic description of the area, including descriptions of the various geologic units and correlates the airborne data to the geologic units as provided by the geologic maps. Also included is a frequency distribution study of the data as a function of the geologic units encountered over the NTMS area including the tie line data. This report also consists of a discussion of the area surveyed and includes all single record reduced data and averaged record data listings on microfiche.

The results of analyses of the airborne gamma radiation and total magnetic field survey flown for the region identified as the Trona National Topographic Map NI-11-12 is presented in Volume I and II of this report. This volume gives the description of the program and the results.

This report examines water quality, levels, and use for groundwater in the Eureka Area, Humboldt County, California. It includes maps, graphs, and other figures.

Report presenting the test pit logs and additional laboratory analysis results for a uranium distribution investigation of sedimentary facies in Kern Lake, California. Test pit logs record the sample data, visual geographic log and descriptions of specified regions in the area. Tables of laboratory analysis record the surface depth and percentage of sand, silt, clay, and carbon samples for trench samples collected for the study.

Single record data listings taken during aerial gamma-ray and magnetic surveys of the Trona quadrangle in California.

Average record data listings taken during aerial gamma-ray and magnetic surveys of the Trona quadrangle in California.