Thermophotovoltaic space power system, phase 3

Work performed on a research and development program to establish the feasibility of a solar thermophotovoltaic space power generation concept was summarized. The program was multiphased. The earlier work is summarized and the work on the current phase is detailed as it pertains to and extends the earlier work. Much of the experimental hardware and materials development was performed on the internal program. Experimental measurements and data evaluation were performed on the contracted effort. The objectives of the most recent phase were: to examine the thermal control design in order to optimize it for lightweight and low cost; to examine the concentrator optics in an attempt to relieve pointing accuracy requirements to + or - 2 degrees about the optical axis; and to use the results of the thermal and optical studies to synthesize a solar thermophotovoltaic (STPV) module design that is optimized for space application

A simulation for gravity fine structure recovery from high-low GRAVSAT SST data

Covariance error analysis techniques were applied to investigate estimation strategies for the high-low SST mission for accurate local recovery of gravitational fine structure, considering the aliasing effects of unsolved for parameters. Surface density blocks of 5 deg x 5 deg and 2 1/2 deg x 2 1/2 deg resolution were utilized to represent the high order geopotential with the drag-free GRAVSAT configured in a nearly circular polar orbit at 250 km. altitude. GEOPAUSE and geosynchronous satellites were considered as high relay spacecraft. It is demonstrated that knowledge of gravitational fine structure can be significantly improved at 5 deg x 5 deg resolution using SST data from a high-low configuration with reasonably accurate orbits for the low GRAVSAT. The gravity fine structure recoverability of the high-low SST mission is compared with the low-low configuration and shown to be superior

Two-point Taylor series expansions

Coefficients calculated for Taylor series expansion about two points - application of Taylor expansion to two-body proble

Optimized computation with recursive power series integration

Optimized computation with recursive power series integration, applied to three body proble

Avon E. (Hodsdon) Lancaster, interviewed by Jill Hansen

Avon E. (Hodsdon) Lancaster, interviewed by Jill Hansen, November 8, 1977, in her 116 Main Street, Veazie home. Mrs. Lancaster moved to Veazie when she married her husband, Leonard, in 1939. She speaks about her childhood and family in Bangor, and recollections of Veazie from 1939 on. Her home was built about 1800. Listen mfc_na1126_t1185_01https://digitalcommons.library.umaine.edu/mf064/1030/thumbnail.jp