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  • 1
    Publication Date: 2011-08-24
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 30; 3; p. 258-290.
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  • 2
    Publication Date: 2011-08-19
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 27; 258-266
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  • 3
    Publication Date: 2019-06-28
    Type: NACA-RM-E55J18
    Format: application/pdf
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  • 4
    Publication Date: 2019-06-28
    Type: NACA-RM-E55C07
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  • 5
    Publication Date: 2019-06-28
    Description: A 25-year historical review of the Space Electric Rocket Test 2 (SERT 2) mission is presented. The Agena launch vehicle; the SERT 2 spacecraft; and mission-peculiar spacecraft hardware, including two ion thruster systems are described. The 3 1/2-year development period, from 1966 to 1970, that was needed to design, fabricate, and qualify the ion thruster system and the supporting spacecraft components, is documented. Major testing of two ion thruster systems and related auxiliary experiments that were conducted in space after the 3 Feb. 1970, launch are reviewed. Extended ion thruster restarts from 1973 to 1981 are reported, in addition to cross-neutralization tests. Tests of a reflector erosion experiment were continued in 1989 to 1991. The continuing performance of spacecraft subsystems, including the solar arrays, over the 1970-1991 period is summarized. Finally, the knowledge of thruster-spacecraft interactions learned from SERT 2 is listed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 92-3516
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  • 6
    Publication Date: 2019-06-28
    Description: A resurgence of interest in placing large solar concentrator solar dynamic systems in space for power generation has brought up again a concern for maintaining the integrity of the optical properties of highly specular reflecting surfaces in the near earth space environment. One of the environmental hazards needing evaluation is the micrometeoroid environment. It has been shown that highly reflective polished metals and thin film coatings degrade when exposed to simulated micrometeoroids in the lab. At NASA-Lewis, a shock tube was used to simulate the phenomenon of micrometeoroid impact by accelerating micron sized particles to hypervelocities. Any changes in the optical properties of surfaces exposed to this impact were then evaluated. The degradation of optical properties of polished metals and thin metallic films after exposure to simulated micrometeoroids was determined as a function of impacting kinetic energy area of the particles. A calibrated sensor was developed to not only detect the micrometeoroid environment, but also to evaluate the degradation of the optical properties of thin aluminum films in space. Results of the simulation are presented and discussed.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: AIAA PAPER 88-0026
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  • 7
    Publication Date: 2019-06-28
    Description: A resurgence of interest in placing large solar concentrator solar dynamic systems in space for power generation has brought up again a concern for maintaining the integrity of the optical properties of highly specular reflecting surfaces in the near earth space environment. One of the environmental hazards needing evaluation is the micrometeoroid environment. It has been shown that highly reflective polished metals and thin film coatings degrade when exposed to simulated micrometeoroids in the lab. At NASA-Lewis, a shock tube was used to simulate the phenomenon of micrometeoroid impact by accelerating micron sized particles to hypervelocities. Any changes in the optical properties of surfaces exposed to this impact were then evaluated. The degradation of optical properties of polished metals and thin metallic films after exposure to simulated micrometeoroids was determined as a function of impacting kinetic energy area of the particles. A calibrated sensor was developed to not only detect the micrometeoroid environment, but also to evaluate the degradation of the optical properties of thin aluminum films in space. Results of the simulation are presented and discussed.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: NASA-TM-101307 , E-4233 , NAS 1.15:101307
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  • 8
    Publication Date: 2019-07-13
    Description: A 25-year historical review of the Space Electric Rocket Test 2 (SERT 2) mission is presented. The Agena launch vehicle; the SERT 2 spacecraft; and mission-peculiar spacecraft hardware, including two ion thruster systems, are described. The 3 1/2-year development period, from 1966 to 1970, that was needed to design, fabricate, and qualify the ion thruster system and the supporting spacecraft components, is documented. Major testing of two ion thruster systems and related auxiliary experiments that were conducted in space after the 3 Feb. 1970, launch are reviewed. Extended ion thruster restarts from 1973 to 1981 are reported, in addition to cross-neutralization tests. Tests of a reflector erosion experiment were continued in 1989 to 1991. The continuing performance of spacecraft subsystems, including the solar arrays, over the 1970-1991 period is summarized. Finally, the knowledge of thruster-spacecraft interactions learned from SERT 2 is listed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-105636 , E-6839 , NAS 1.15:105636 , AIAA PAPER 92-3516 , Joint Propulsion Conference and Exhibit; Jul 06, 1992 - Jul 08, 1992; Nashville, TN; United States
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  • 9
    Publication Date: 2019-07-13
    Description: The effect of micrometeoroid impact on the optical properties of polished metals and thin film coatings has been simulated by accelerating micron-sized particles to hypervelocities in a shock tube. The degradation of these properties after exposure to simulated meteoroids was determined as a function of impacting kinetic energy/area of the particles. A calibrated sensor, 2000-A Al/stainless steel, was developed to detect the micrometeoroid environment and to evaluate the degradation of the optical properties of thin aluminum films in space. No changes in the optical properties of the highly reflective surface sensor on SERT II, launched in 1970, were measured during 19 years in space. These results are found to be in agreement with the 1969 Micrometeoroid Flux Model. It is concluded that a highly reflective surface should lose less than 1 percent of its specular reflectance in near-earth orbit during 19 years.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Annual Meeting of the Minerals, Metals, and Materials Society; Feb 17, 1990 - Feb 22, 1990; Anaheim, CA; United States
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