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  • Other Sources  (210)
  • Spacecraft Design, Testing and Performance  (59)
  • SPACE TRANSPORTATION  (50)
  • Earth Resources and Remote Sensing  (46)
  • Man/System Technology and Life Support  (35)
  • Space Sciences (General)
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  • Other Sources  (210)
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  • 1
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    Ten Years of MISR Observations from Terra: Looking Back, Ahead, and in Between (2010)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Multi-angle Imaging SpectroRadiometer (MISR) instrument has been collecting global Earth data from NASA's Terra satellite since February 2000. With its nine along-track view angles, four visible/near-infrared spectral bands, intrinsic spatial resolution of 275 m, and stable radiometric and geometric calibration, no instrument that combines MISR's attributes has previously flown in space. The more than 10-year (and counting) MISR data record provides unprecedented opportunities for characterizing long-term trends in aerosol, cloud, and surface properties, and includes 3-D textural information conventionally thought to be accessible only to active sensors.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE Geoscience and Remote Sensing Society Conference; Jul 25, 2010 - Jul 30, 2010; Honolulu, HI; United States
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    NASA TECHNICAL REPORTS
  • 2
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    Design, Development, Implementation, and On-Orbit Performance of the Dynamic Ionosphere CubeSat Experiment Mission (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Funded by the NSF CubeSat and NASA ELaNa programs, the Dynamic Ionosphere CubeSat Experiment (DICE) mission consists of two 1.5U (1.5 Unit) CubeSats which were launched into an eccentric low Earth orbit on October 28, 2011. Each identical spacecraft carries two Langmuir probes to measure ionospheric in-situ plasma densities, electric field probes to measure in-situ DC and AC electric fields, and a science grade magnetometer to measure in-situ DC and AC magnetic fields. Given the tight integration of these multiple sensors with the CubeSat platforms, each of the DICE spacecraft is effectively a sensor-sat capable of comprehensive ionospheric diagnostics. The use of two identical sensor-sats at slightly different orbiting velocities in nearly identical orbits permits the deconvolution of spatial and temporal ambiguities in the observations of the ionosphere from a moving platform. In addition to demonstrating nanosat-based constellation science, the DICE mission is advancing a number of groundbreaking CubeSat technologies including miniaturized mechanisms and high-speed downlink communications.
    Keywords: Space Sciences (General)
    Type: GSFC-E-DAA-TN22108 , Space Science Reviews (ISSN 0038-6308) (e-ISSN 1572-9672); 181; 1ý4; 61–120
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    NASA TECHNICAL REPORTS
  • 3
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    Human and behavioral factors contributing to spine-based neurological cockpit injuries in pilots of high-performance aircraft: recommendations for management and prevention (2000)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: In high-performance aircraft, the need for total environmental awareness coupled with high-g loading (often with abrupt onset) creates a predilection for cervical spine injury while the pilot is performing routine movements within the cockpit. In this study, the prevalence and severity of cervical spine injury are assessed via a modified cross-sectional survey of pilots of multiple aircraft types (T-38 and F-14, F-16, and F/A-18 fighters). Ninety-five surveys were administered, with 58 full responses. Fifty percent of all pilots reported in-flight or immediate post-flight spine-based pain, and 90% of fighter pilots reported at least one event, most commonly (〉 90%) occurring during high-g (〉 5 g) turns of the aircraft with the head deviated from the anatomical neutral position. Pre-flight stretching was not associated with a statistically significant reduction in neck pain episodes in this evaluation, whereas a regular weight training program in the F/A-18 group approached a significant reduction (mean = 2.492; p 〈 0.064). Different cockpit ergonomics may vary the predisposition to cervical injury from airframe to airframe. Several strategies for prevention are possible from both an aircraft design and a preventive medicine standpoint. Countermeasure strategies against spine injury in pilots of high-performance aircraft require additional research, so that future aircraft will not be limited by the human in control.
    Keywords: Man/System Technology and Life Support
    Type: Military medicine (ISSN 0026-4075); Volume 165; 1; 6-12
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    NASA TECHNICAL REPORTS
  • 4
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    LASE measurements of convective boundary layer development during SGP97 (1998)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The Southern Great Plains 1997 (SGP97) field experiment was conducted in Oklahoma during June-July 1997 to validate the models used for computing remote soil moisture using measurements by microwave radiometers. One of the objectives of SGP97 was to examine the effect of soil moisture on the evolution of the Atmospheric Boundary Layer (ABL) and clouds over the Southern Great Plains (SGP) during the warm season. The LASE (Lidar Atmospheric Sensing Experiment) airborne DIAL (Differential Absorption Lidar) system, which was flown autonomously on the NASA ER-2 aircraft during previous missions, was reconfigured to fly on the NASA P3 research aircraft. During SGP97 LASE was used to study the morning evolution of the ABL, particularly as manifested in the development of the convective boundary layer, and to study the influence of soil moisture variations on the development of ABL. The ABL development is strongly influenced by the surface energy budget, which is in turn influenced by soil moisture, mesoscale meteorology, clouds, and solar insolation. LASE data acquired during this mission are being used to study the ABL water vapor budget, the development of the ABL, spatial and temporal variabilities in the ABL, and the meteorological factors that influence the ABL development. This field experiment also permitted comparisons of LASE water vapor measurements with water vapor profiles acquired by radiosondes launched at the DOE (Department of Energy) Atmospheric Radiation Measurement (ARM) Southern Great Plain (SGP) site and at NASA/Wallops Flight Facility, as well as with measurements from other SGP97 aircraft.
    Keywords: Earth Resources and Remote Sensing
    Type: Nineteenth International Laser Radar Conference; 261-264; NASA/CP-1998-207671/PT1
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    NASA TECHNICAL REPORTS
  • 5
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    Design objectives of the multimission modular spacecraft (1982)
    In:  CASI
    Details
    Publication Date: 2006-04-12
    Description: Servicing economics for LANDSAT are examined. The following objectives of the multimission modular spacecraft are outlined: retrieval; multimission capability; standard flight support system; standard hardware; repair and refurbishment on orbit; instrument replacement; standard ground support system; and standard software.
    Keywords: SPACE TRANSPORTATION
    Type: NASA. Johnson Space Center Satellite Serv. Workshop, Vol. 2; p 168-199
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    NASA TECHNICAL REPORTS
  • 6
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    Low-Earth orbit satellite servicing economics (1982)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Servicing economics of low Earth orbit satellites were studied. The following topics are examined: the economic importance of the repair missions; comparison of mission cost as opposed to satellite modulation transfer functions over a 10 year period; the effect of satellite flight rate change due to changes in satellite failure rate; estimated satellite cost reduction with shuttle operation projects from the 1960's to the 1970's; design objectives of the multimission modular spacecraft; and the economic importance of the repair mission.
    Keywords: SPACE TRANSPORTATION
    Type: NASA. Johnson Space Center Satellite Serv. Workshop, Vol. 2; p 150-167
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  • 7
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    Structural concepts for future space transportation system orbiters (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: SPACE TRANSPORTATION
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 22; 333-339
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    NASA TECHNICAL REPORTS
  • 8
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    Solar power satellite transportation (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Preliminary studies and concepts are discussed relative to the feasibility and economics of developing the capability to transport a network of operational 10-GWe solar power satellites into geosynchronous orbit by A.D. 2025. The satellite is briefly described, and its space transportation options are presented. Launch vehicle requirements and concepts are discussed in relationship to the transportation task.
    Keywords: SPACE TRANSPORTATION
    Type: Acta Astronautica; 4; Jan
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  • 9
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    Space transportation (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The physical laws governing launch vehicles are reviewed, together with the performance of launch vehicles thus far used and expected developments in space transportation systems. Launches are generally made in the direction of earth rotation to take advantage of the initial velocity in that direction, which can amount to about 0.46 km/sec at the equator. Spacecraft usually attain a parking orbit, where spacecraft conditions are assessed before moving on to final orbit or interplanetary trajectory. Rocket batteries were first used in a battle near Beijing in 1232, and manned space flight began with the Vostok flight in 1961, followed by the Apollo lunar landings in the later 1960s. Rocket thrust performance is analyzed, together with the thrust/mass ratio for ascent and descent. The Shuttle, capable of placing 29.5 t in LEO, will be or is equipped to also carry IUS and PAM engines for transferring payloads from LEO to GEO. Parallel burn boosters may be added to increase the payload capability, and Shuttle-derived launch vehicles may be developed to carry construction materials to space and return to earth for a runway landing. Alternatively, the Shuttle engines may be modularized in order to develop a heavy-lift launch vehicle for unmanned cargo ascents.
    Keywords: SPACE TRANSPORTATION
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    NASA TECHNICAL REPORTS
  • 10
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    Hyperspectral sensor systems data sources for enhanced analysis (2003)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Earth Resources and Remote Sensing
    Type: International Geoscience and Remote Sensing Symposium (IGARSS); Toulouse; France
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