Saturn's largest moon, Titan, is a totally unique planetary body which is certain to yield exciting new phenomena. Current information is lacking in detail to distinguish between a thin methane rich atmosphere and a thick nitrogen rich atmosphere. Therefore, both the thin and thick atmospheric models were used for the study of various Titan probe classes described in this report. The technical requirements, conceptual design, science return, schedule, cost and mission implications of three...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC ENTRY, PLANETARY LANDING, SATURN (PLANET), SPACE...
The standard solar cells (2x2 cm) from the cast silicon heatexchanger method) showed a maximum AMO efficiency of 10.1%. Cells from low resistivity material (0.5 ohm-cm) showed lower performance than those of the high resistivity cast silicon (3 ohm-cm), an average efficiency 9.5% versus 7.6% Maximum AMO efficiency of the standard solar cells (2x2 cm) from the EFG (RH) ribbons was about 7.5%. The solar cells from controlled SiC, using the displaced die, showed more consistent and better...
Topics: NASA Technical Reports Server (NTRS), ELECTRICAL PROPERTIES, ENERGY CONVERSION EFFICIENCY, RIBBONS,...
The validation of a 20-year service life for low-cost photovoltaic arrays is a critical requirement in the Low-Cost Solar Array (LSA) Project. The validation is accomplished through accelerated life-prediction tests. A two-phase study was conducted to address the needs before such tests are carried out. The results and recommended techniques from the Phase 1 investigation are summarized in the appendix. Phase 2 of the study is covered in this report and consisted of experimental evaluations of...
Topics: NASA Technical Reports Server (NTRS), MEASURING INSTRUMENTS, PHOTOVOLTAIC CELLS, SERVICE LIFE,...
The mechanisms which lead to the destruction of a normally protective scale during the initial stages of hot corrosion of 14 nickel-base alloys contaminated with Na2SO4 and other condensed deposits were investigated. A continuous reading microbalance was used to record weight changes at temperatures between 900 C and 1000 C at 1 atmosphere pressure of slowly flowing oxygen. The reaction was initiated by raising a preheated furnace around the quartz tube in which the specimen was supported with...
Topics: NASA Technical Reports Server (NTRS), ALKALIES, HOT CORROSION, MICROSTRUCTURE, NICKEL ALLOYS,...
Projects currently in progress on ionospheric research are described. General topics discussed include: planetary atmospheres, the ionosphere and its region, and mass spectroscopy.
Topics: NASA Technical Reports Server (NTRS), IONOSPHERICS, PLANETARY IONOSPHERES, RESEARCH AND...
There are no author-identified significant results in this report.
Topics: NASA Technical Reports Server (NTRS), MEASURING INSTRUMENTS, PRECISION, DISPLAY DEVICES, EARTH...
The standard solar cells (2x2 cm) from the cast silicon (HEM) showed a maximum AMO efficiency of 10.1%. Cells from the low resistivity material (0.5 ohm-cm) showed lower performance than those of the high resistivity cast silicon (3 ohm-cm), an average efficiency 9.5% versus 7.6%. Maximum AMO efficiency of the standard solar cells from the EFG (RH) ribbons was about 7.5%. The solar cells from the controlled SiC, using the displaced die, showed more consistent and better performance than those...
Topics: NASA Technical Reports Server (NTRS), ENERGY CONVERSION EFFICIENCY, PRODUCT DEVELOPMENT, SOLAR...
A low cost ohmic contact on silicon solar cells based on molybdenum-tin metal systems was developed. The approach is based on the formulation of a screenable ink composed from molybdenum oxide and tin mixture. The reduction of Mo03 into Mo and the establishment of Mo 03:Sn ratio is studied. Both tasks were done in an experimental station constructed for this purpose. The results show that molybdenum was formed from its oxide at 800 C. and improved in bonding to silicon at 900 C. A 20%...
Topics: NASA Technical Reports Server (NTRS), ELECTRIC CONTACTS, MOLYBDENUM ALLOYS, PRODUCT DEVELOPMENT,...
There are no author-identified significant results in this report.
Topics: NASA Technical Reports Server (NTRS), COLUMBIA RIVER BASIN (ID-OR-WA), FIRES, FORESTS, LAND USE,...
Topics covered include: (1) estimation in discrete multivariate distributions; (2) a procedure to predict cloud cover frequencies in the bivariate case; (3) a program to compute conditional bivariate normal parameters; (4) the transformation of nonnormal multivariate to near-normal; (5) test of fit for the extreme value distribution based upon the generalized minimum chi-square; (6) test of fit for continuous distributions based upon the generalized minimum chi-square; (7) effect of correlated...
Topics: NASA Technical Reports Server (NTRS), CLOUD COVER, MULTIVARIATE STATISTICAL ANALYSIS, STATISTICAL...
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