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  • Other Sources  (494)
  • SPACECRAFT PROPULSION AND POWER  (281)
  • EARTH RESOURCES AND REMOTE SENSING  (191)
  • Chemical Engineering
  • Fisheries
  • GENERAL
  • Inorganic Chemistry
  • 1990-1994  (477)
  • 1955-1959  (17)
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  • 1
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    On protection of Freedom's solar dynamic radiator from the orbital debris environment. II - Further testing and analyses (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Presented here are results of a test program undertaken to further define the response of the solar dynamic radiator to hypervelocity impact (HVI). Tests were conducted on representative radiator panels (under ambient, nonoperating conditions) over a range of velocity. Target parameters are also varied. Data indicate that analytical penetration predictions are conservative (i.e., pessimistic) for the specific configuration of the solar dynamic radiator. Test results are used to define the solar dynamic radiator reliability with respect to HVI more rigorously than previous studies. Test data, reliability, and survivability results are presented.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: ASME, Transactions, Journal of Solar Energy Engineering (ISSN 0199-6231); p. 142-149.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    On protection of Freedom's solar dynamic radiator from the orbital debris environment. I - Preliminary analysis and testing (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A great deal of experimentation and analysis was performed to quantify penetration thresholds of components which will experience orbital debris impacts. Penetration was found to depend upon mission specific parameters such as orbital altitude, inclination, and orientation of the component; and upon component specific parameters such as material, density and the geometry particular to its shielding. Experimental results are highly dependent upon shield configuration and cannot be extrapolated with confidence to alternate shield configurations. Also, current experimental capabilities are limited to velocities which only approach the lower limit of predicted orbital debris velocities. Therefore, prediction of the penetrating particle size for a particular component having a complex geometry remains highly uncertain. An approach is described which was developed to assess on-orbit survivability of the solar dynamic radiator due to micrometeoroid and space debris impacts. Preliminary analyses are presented to quantify the solar dynamic radiator survivability, and include the type of particle and particle population expected to defeat the radiator bumpering (i.e., penetrate a fluid flow tube). Results of preliminary hypervelocity impact testing performed on radiator panel samples (in the 6 to 7 km/sec velocity range) are also presented.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: ASME, Transactions, Journal of Solar Energy Engineering (ISSN 0199-6231); p. 135-141.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Advanced Solid-State Array Spectrometer (ASAS) data sets from the 1990 field season: A unique look at two forested ecosystems (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Advanced Solid-state Array Spectrometer (ASAS) is a pointable imaging spectrometer which uses a solid-state array to acquire imagery of terrestrial targets in 29 spectral bands from .4 to .8 microns. Performance and calibration of the instrument are described. The ASAS data sets obtained in 1990 provide a unique look at forest canopies from two different forest regions of the North America continent under varying temporal, spectral, and bidirectional conditions. These data sets will be used to study such parameters as the albedo of forest canopies, the dynamics of scene radiation due to factors such as canopy architecture, moisture stress, leaf chemistry, topography, and understory composition.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA, Washington, 4th Airborne Geoscience Workshop; p 287-288
    Format: application/pdf
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  • 4
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    Advanced Main Combustion Chamber structural jacket strength analysis (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The structural analysis of the Advanced Main Combustion Chamber (AMCC) is presented. The AMCC is an advanced fabrication concept of the Space Shuttle Main Engine main combustion chamber (MCC). Reduced cost and fabrication time of up to 75 percent were the goals of the AMCC with cast jacket with vacuum plasma sprayed or platelet liner. Since the cast material for the AMCC is much weaker than the wrought material for the MCC, the AMCC is heavier and strength margins much lower in some areas. Proven hand solutions were used to size the manifolds cutout tee areas for combined pressure and applied loads. Detailed finite element strength analyses were used to size the manifolds, longitudinal ribs, and jacket for combined pressure and applied local loads. The design of the gimbal actuator strut attachment lugs were determined by finite element analyses and hand solutions.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 93-1395 , In: AIAA(ASME)ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 34th and AIAA/ASME Adaptive Structures Forum, La Jolla, CA, Apr. 19-22, 1993, Technical Papers. Pt. 2 (A93-33876 1; p. 833-836.
    Format: text
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  • 5
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    Finite element analysis of the Space Shuttle Main Engine (SSME) alternate turbopump development (ATD) high pressure oxydizer turbopump (HPOTP) (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A 3D model of all stationary components of the ATD HPOTP is analyzed using a superelement solution technique to obtain a better understanding of the pump behavior and to support pump testing. Emphasis is place on the methods used for determining deflections. As part of the model verification, analyses were conducted on the main housing model under proof-pressure and push-test loading conditions. The analysis at 109 percent rate power level resulted in asymmetric deformation patterns which were used to calculate operating and rub clearances. The present analysis is considered to provide the most realistic representation of the ATD HPOTP to date.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 93-1396 , In: AIAA(ASME)ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 34th and AIAA/ASME Adaptive Structures Forum, La Jolla, CA, Apr. 19-22, 1993, Technical Papers. Pt. 2 (A93-33876 1; p. 837-846.
    Format: text
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  • 6
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    On protection of Freedom's solar dynamic radiator from the orbital debris environment. Part 2: Further testing and analyses (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Presented here are results of a test program undertaken to further define the response of the solar dynamic radiator to hypervelocity impact (HVI). Tests were conducted on representative radiator panels (under ambient, nonoperating conditions) over a range of velocity. Target parameters are also varied. Data indicate that analytical penetration predictions are conservative (i.e., pessimistic) for the specific configuration of the solar dynamic radiator. Test results are used to define the solar dynamic radiator reliability with respect to HVI more rigorously than previous studies. Test data, reliability, and survivability results are presented.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-104514 , E-6335 , NAS 1.15:104514 , International Solar Energy Conference; Apr 04, 1992 - Apr 08, 1992; Lahaina, Maui, HI; United States
    Format: application/pdf
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  • 7
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    On protection of Freedom's solar dynamic radiator from the orbital debris environment. Part 1: Preliminary analyses and testing (1990)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A great deal of experimentation and analysis was performed to quantify penetration thresholds of components which will experience orbital debris impacts. Penetration was found to depend upon mission specific parameters such as orbital altitude, inclination, and orientation of the component; and upon component specific parameters such as material, density and the geometry particular to its shielding. Experimental results are highly dependent upon shield configuration and cannot be extrapolated with confidence to alternate shield configurations. Also, current experimental capabilities are limited to velocities which only approach the lower limit of predicted orbital debris velocities. Therefore, prediction of the penetrating particle size for a particular component having a complex geometry remains highly uncertain. An approach is described which was developed to assess on-orbit survivability of the solar dynamic radiator due to micrometeoroid and space debris impacts. Preliminary analyses are presented to quantify the solar dynamic radiator survivability, and include the type of particle and particle population expected to defeat the radiator bumpering (i.e., penetrate a fluid flow tube). Results of preliminary hypervelocity impact testing performed on radiator panel samples (in the 6 to 7 km/sec velocity range) are also presented. Plans for further analyses and testing are discussed. These efforts are expected to lead to a radiator design which will perform to requirements over the expected lifetime.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-102458 , E-5245 , NAS 1.15:102458 , International Solar Energy Conference; Apr 01, 1990 - Apr 04, 1990; Miami, FL; United States
    Format: application/pdf
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  • 8
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    Initial observations on using SAR to monitor wildfire scars in boreal forests (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Initial observations on the effects of wildfires in black spruce forests on radar backscatter are presented. Airborne and spaceborne SAR imagery are utilized to illustrate two distinct fire signatures. A theory is presented to explain these differences.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Journal of Remote Sensing (ISSN 0143-1161); 13; 18; p. 3495-3501.
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    NASA TECHNICAL REPORTS
  • 9
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    Applications of interferometrically derived terrain slopes: Normalization of SAR backscatter and the interferometric correlation coefficient (1994)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Terrain slopes, which can be measured with Synthetic Aperture Radar (SAR) interferometry either from a height map or from the interferometric phase gradient, were used to calculate the local incidence angle and the correct pixel area. Both are required for correct thematic interpretation of SAR data. The interferometric correlation depends on the pixel area projected on a plane perpendicular to the look vector and requires correction for slope effects. Methods for normalization of the backscatter and interferometric correlation for ERS-1 SAR are presented.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: ESA, Proceedings of 2nd ERS-1 Symposium on Space at the Service of Our Environment, Volume 2; p 723-726
    Format: text
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  • 10
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    Seasonal LAI in slash pine estimated with Landsat TM (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The leaf area index (LAI, total area of leaves per unit area of ground) of most forest canopies varies throughout the year, yet for logistical reasons it is difficult to estimate anything more detailed than a seasonal maximum LAI. To determine if remotely sensed data can be used to estimate LAI seasonally, field measurements of LAI were compared to normalized difference vegetation index (NDVI) values derived using Lnandsat Thematic Mapper (TM) data, for 16 fertilized and control slash pine plots on 3 dates. Linear relationships existed between NDVI and LAI with R (sup 2) values of 0.35, 0.75, and 0.86 for February 1988, September 1988, and March, 1989, respectively. This is the first reported study in which NDVI is related to forest LAI recorded during the month of sensor overpass. Predictive relationships based on data from eight of the plots were used to estimate the LAI of the other eight plots with a root-mean-square error of 0.74 LAI, which is 15.6 percent of the mean LAI. This demonstrates the potential use of Landsat TM data for studying seasonal dynamics in forest canopies.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment (ISSN 0034-4257); 39; 3-13
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