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  • 1
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    Solar particle tracks in glass from the Surveyor 3 spacecraft (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Solar particle tracks in clear filter glass from Surveyor 3 spacecraft, comparing with lunar rocks track results
    Keywords: SPACE SCIENCES
    Type: ; 9-12, 15 (
    Format: text
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  • 2
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    Flight test maneuver modeling and control (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The use of automated flight test schemes decrease the aircraft flight testing time and pilot work load while enhancing the data quality. Two major elements involved in developing such an automated technique are maneuver modeling to generate command histories from the maneuver specifications and the synthesis of control systems to track these command histories. This paper describes the maneuver modeling for eight flight test trajectories. The control system synthesis with Kosut's suboptimal minimum error excitation linear quadratic regulator approach is presented. The closed-loop simulation results are given.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 86-0426
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  • 3
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    Fossil particle tracks and uranium distributions in minerals of the vaca muerta meteorite. (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-05-24
    Description: Radiochemical measurements of fossil charged particle tracks and uranium distribution in Vaca Muerta meteorite
    Keywords: SPACE SCIENCES
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  • 4
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    Real-time flutter identification (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The techniques and a FORTRAN 77 MOdal Parameter IDentification (MOPID) computer program developed for identification of the frequencies and damping ratios of multiple flutter modes in real time are documented. Physically meaningful model parameterization was combined with state of the art recursive identification techniques and applied to the problem of real time flutter mode monitoring. The performance of the algorithm in terms of convergence speed and parameter estimation error is demonstrated for several simulated data cases, and the results of actual flight data analysis from two different vehicles are presented. It is indicated that the algorithm is capable of real time monitoring of aircraft flutter characteristics with a high degree of reliability.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-3933 , NAS 1.26:3933 , ISI-48
    Format: application/pdf
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  • 5
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    Real-time flutter analysis (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The important algorithm issues necessary to achieve a real time flutter monitoring system; namely, the guidelines for choosing appropriate model forms, reduction of the parameter convergence transient, handling multiple modes, the effect of over parameterization, and estimate accuracy predictions, both online and for experiment design are addressed. An approach for efficiently computing continuous-time flutter parameter Cramer-Rao estimate error bounds were developed. This enables a convincing comparison of theoretical and simulation results, as well as offline studies in preparation for a flight test. Theoretical predictions, simulation and flight test results from the NASA Drones for Aerodynamic and Structural Test (DAST) Program are compared.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-170412 , NAS 1.26:170412 , ISI-24
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  • 6
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    Brief review of thermoluminescence studies in lunar samples. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A weak thermoluminescence, due primarily to plagioclase feldspar, is found to exist in Apollo 11 and 12 lunar rock and topsoil samples. This effect increases with depth to about 10 cm below the surface and becomes relatively even in greater depth. The penetration of the diurnal temperature wave is traced to the rock thermoluminescence. Evidence is also found for the thermal draining of the surface rock.
    Keywords: SPACE SCIENCES
    Type: Modern Geology; 2; 1971
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  • 7
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    Fossil track and thermoluminescence studies of Luna 16 material. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurements of track densities and thermoluminescence have been made on two 5-mg samples (feldspar crystals) from the Luna 16 core tube. The distribution of track densities is shown graphically and is similar to that observed in heavily irradiated Apollo samples. Results of thermoluminescence measurements are plotted and also compared with similar measurements of Apollo samples.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 13; Jan. 197
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  • 8
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    Lunar surface dynamics: Some general conclusions and new results from Apollo 16 and 17 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Exposure ages of Apollo 17 rocks as measured by tracks and the Kr-Kr rare gas method are reported. Concordant ages of 22 - or + 1 million year (my) are obtained for the station 6 boulder sample 76315. This value is interpreted as the time when the station 6 boulder was emplaced in its present position. Reasonable agreement is also obtained by the two methods for another station 6 boulder, sample 76015. Discordant ages (respectively 5 and 28 my by the track and rare gas methods) are obtained for the station 7 boulder sample, 77135, indicating that the boulder was emplaced at least 5 my ago. The 72 my exposure age of 75035, in general agreement with previous measurements of approximately 85 my for another Camelot boulder, may well date the formation of Camelot. Rock 76015 was split and one surface exposed to the sky through a very small solid angle.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-138489
    Format: application/pdf
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  • 9
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    Accelerator irradiations of minerals - Implications for track formation mechanisms and for studies of lunar and meteoritic materials (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Radiation effects of accelerated heavy ions in minerals characteristic of meteorites
    Keywords: SPACE SCIENCES
    Type: NASA-CR-110439 , SPP-16
    Format: application/pdf
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  • 10
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    Fossil track and thermoluminescence studies of Luna 20 material. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Track densities in 85 feldspar crystals from L-2009 range from 2,500,000 per sq cm to greater than one billion per sq cm. This track distribution represents an intermediate case between what have been previously defined as lightly and heavily irradiated soils and suggests that the Luna 20 sample consists of a mixture of a mature, heavily irradiated component with another, lightly irradiated component. Using a two-component mixing model, the age of the lightly irradiated component is about 270,000,000 yr. It is possible, but by no means certain, that this is associated with the formation of the crater Apollonius C. At about 200 C the ratio of natural thermoluminescence to that induced by a standard irradiation is similar to that in Apollo 12 and 14 cores below about 7 cm. This confirms that most of the Luna 20 sample represents subsurface material.
    Keywords: SPACE SCIENCES
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