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  • 1
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    The Backup-Gilbert method and its application to the electrical conductivity problem (1972)
    In:  CASI
    Details
    Publication Date: 2006-03-12
    Description: The theory of Backus and Gilbert gives a technique for solving the general linear inverse problem. Observational error and lack of data are shown to reduce the reliability of the solution in different ways: the former introduces statistical uncertainties in the model, while the latter smooths out the detail. Precision can be improved by sacrificing resolving power, and vice versa, so that some compromise may be made between the two in choosing the best model. Nonlinear inverse problems can be brought into the domain of the theory by linearizing about a typical solution. The inverse problem of electrical conductivity in the mantle is used to illustrate the Backus-Gilbert technique; an example of the tradeoff diagram is given.
    Keywords: ELECTRONICS
    Type: NASA. Ames Res. Center Math. of Profile Inversion; 8 p
    Format: text
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  • 2
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    Summary of scientific results (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The accomplishments of the Apollo 17 flight are summarized. The basic objective of the mission was to sample basin-rim highland material and adjacent mare material and to investigate the geological evolutionary relationship between these two major units. The lunar experiments which were conducted include: (1) lunar field geology, (2) surface electrical experiments, (3) lunar traverse gravimeter experiments, (4) lunar seismic profiling experiment, (5) lunar ejecta and meteorites experiment, (6) analysis of lunar atmosphere composition, and (7) heat flow experiments.
    Keywords: SPACE SCIENCES
    Type: Apollo 17 Prelim. Sci. Rept.; 7 p
    Format: text
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  • 3
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    The effects of radiation on science instruments during Grand Tour type missions (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Radiation effects on components of science instruments used on outer planets Grand Tour mission
    Keywords: NUCLEAR ENGINEERING
    Type: ; ADEMIE DES SCIENCES
    Format: text
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  • 4
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    Earth resources programs at the Langley Research Center. Part 1: Advanced Applications Flight Experiments (AAFE) and microwave remote sensing program (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The earth resources activity is comprised of two basic programs as follows: advanced applications flight experiments, and microwave remote sensing. The two programs are in various stages of implementation, extending from experimental investigations within both the AAFE program and the microwave remote sensing program, to multidisciplinary studies and planning. The purpose of this paper is simply to identify the main thrust of the Langley Research Center activity in earth resources.
    Keywords: GEOPHYSICS
    Type: 4th Ann. Earth Resources Program Rev., Vol. 1; 12 p
    Format: application/pdf
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  • 5
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    Materials science and manufacturing in space: The NBS program of ground based research (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: National Bereau of Standards work for NASA in support of NASA's Space Processing Program is described. The objectives of the NBS program are to perform ground-based studies of those aspects of space that could possibly provide a unique environment for making materials more perfect or more pure. The approach taken deals primarily with experimental and theoretical studies of the possible effects of the absence of gravitational forces on those materials preparation processes where the presence of gravity may be important in reducing perfection or purity. The materials preparation processes studied comprise 6 tasks in the areas of crystal growth, purification and chemical processing, and the preparation of composites. They are: (1) crystal perfection in Czochralski growth; (2) evaporative preparation of ultrahigh purity materials; (3) vacuum effects in the preparation of composite materials; (4) melt shape in weightless crystal growth; (5) vapor transport synthesis and crystal growth of oxides; and (6) surface traction and other surface phenomena.
    Keywords: PHYSICS, SOLID-STATE
    Type: NASA. Marshall Space Flight Center Proc. of the 3d Space Processing Symp. on Skylab Results, Vol. 2; p 763-835
    Format: text
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  • 6
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    A study of the compatibility of science instruments with the solar electric propulsion space vehicle (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Electromagnetic interference and field-of-view constraints are identified as the areas of most concern to science on solar electric propulsion space vehicles. Several areas are indicated which more detailed data on the space vehicle environment are needed. In addition, possible means to attain or demonstrate science/space vehicle compatibility are recommended for further iteration between space vehicle design and science payload considerations. The space vehicle design developed by the solar electric propulsion system integration technology effort is used. Two payload sets for comet Encke missions (a slow flyby and a rendezvous), as well as several instruments which are not included in the two payload sets, are analyzed to determine requirements on the space vehicle imposed by the instruments in order to meet their objectives. Environmental requirements for the sets of instruments are developed and compared to both the SEPSIT design criteria and the environment as it is presently understood.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-136213 , JPL-TM-33-641
    Format: application/pdf
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  • 7
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    Elastohydrodynamic film thickness formula based on X-ray measurements with a synthetic paraffinic oil (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An empirical elastohydrodynamic film thickness formula for heavily loaded contacts based upon X-ray film thickness measurements made with a synthetic paraffinic oil is presented. The deduced relation was found to adequately reflect the high load dependence exhibited by the measured minimum film thickness data at high Hertizian contact stresses, that is, above 1.04 x 10 to the ninth N/sq m (150,000 psi). Comparisons were made with the numerical results from a theoretical isothermal film thickness formula. The effects of changes in contact geometry, material, and lubricant properties on the form of the empirical model are also discussed.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-7502 , E-7041
    Format: application/pdf
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  • 8
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    Effect of lubricant extreme pressure additives on rolling element fatigue life (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effects of surface active additives on rolling-element fatigue life were investigated with the five-ball fatigue tester at conditions where classical subsurface initiated rolling-element fatigue is the sole mode of failure. Test balls of AISI 52100, AISI M-50, and AISI 1018 were run with an acid-treated white oil containing either 2.5 percent sulfurized terpene, 1 percent didodecyl phosphite, or 5 percent chlorinated wax. In general, it was found that the influence of surface active additives was detrimental to rolling-element fatigue life. The chlorinated-wax additive significantly reduced fatigue life by a factor of 7. The base oil with the 2.5 percent sulfurized-terpene additive can reduce fatigue life by as much as 50 percent. No statistical change in fatigue life occurred with the base oil having the 1 percent didodecyl-phosphite additive. The additives used with the base oil did not change the ranking of the bearing steels where rolling-element fatigue life was of subsurface origin.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-7383 , E-7337
    Format: application/pdf
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  • 9
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    Method of making rolling element bearings (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method is described of making rolling elements by forming low mass cores having either hollow centers or being of a low mass material. The low mass cores are plated and heat treated to provide hard surfaces on the rolling elements. After grinding to the proper diameter the rolling elements are assembled between races to form a hearing.
    Keywords: GENERAL
    Format: application/pdf
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  • 10
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    Comparative lubrication studies of OH-58A tail rotor drive shaft bearings (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Comparative lubrication tests were run with OH-58A helicopter tail rotor drive shaft bearings. The tests were run in an outdoor environment with ambient temperatures ranging from 10 to 75 F. Dust was periodically applied to the bearings to simulate field conditions. The cause of bearing failure was associated with dust penetration. Rotor shaft failure was found to be caused by the shaft rotating in the standard rubber collar due to seizure of the bearings. Bearings with a positive rubbing seal having a MIL-G-81322 grease produced lives greater than with bearings having labyrinth seals and a mineral oil paste lubricant. An elongated collar prevented failure of the rotor shaft during bearing seizure. In a limited test, installation of tail boom shrouds over the bearings which excluded dust and water resulted in bearing lives in excess of 1800 hours or 1200 hours greater than the current 600 hours TBO, regardless of the lubricant-bearing combination used.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68118 , E-7054
    Format: application/pdf
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