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  • 1
    Electronic Resource
    Electronic Resource
    Retrieval of thick sections from glass for high-voltage electron microscopy (1986)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 4 (1986), S. 69-71 
    Details
    ISSN: 0741-0581
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060040109
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    Paper (German National Licenses)
    Fulltext
  • 2
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    High voltage battery cell scanner development (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Battery cell voltage scanners have been previously used in low voltage spacecraft applications. In connection with future missions involving an employment of high-power high voltage power subsystems and/or autonomous power subsystem management for unattended operation, it will be necessary to utilize battery cell voltage scanners to provide battery cell voltage information for early detection of impending battery cell degradation/failures. In preparation for such missions, a novel battery cell voltage scanner design has been developed. The novel design makes use of low voltage circuit modules which can be applied to high voltage batteries in a building block fashion. A description is presented of the design concept and test results of the high voltage battery cell scanner, and its operation with an autonomously managed power subsystem is discussed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Automated distribution system management for multichannel space power systems (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A NASA sponsored study of space power distribution system technology is in progress to develop an autonomously managed power system (AMPS) for large space power platforms. The multichannel, multikilowatt, utility-type power subsystem proposed presents new survivability requirements and increased subsystem complexity. The computer controls under development for the power management system must optimize the power subsystem performance and minimize the life cycle cost of the platform. A distribution system management philosophy has been formulated which incorporates these constraints. Its implementation using a TI9900 microprocessor and FORTH as the programming language is presented. The approach offers a novel solution to the perplexing problem of determining the optimal combination of loads which should be connected to each power channel for a versatile electrical distribution concept.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Development of management technology for large power systems (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Autonomous power management has been proposed as a method to perform optimization of power subsystem performance in connection with the management of multikilowatt space platforms. A concept for a 250-kW utility-type power subsystem was developed. A Cassegrain concentrator solar array primary source is conditioned by a solar array switching unit which supplies seventeen 220 +20 Vdc power channels. A power management subsystem provides the monitoring and control of the overall electrical power subsystem. The discussed system concept for autonomous management of high power space platforms utilizes on-board microprocessors in a decentralized data management architecture. A data bus protocol and a data bus contention resolution scheme were selected in conjunction with the dencentralized management architecture.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''82; Seventeenth Intersociety Energy Conversion Engineering Conference; Aug 08, 1982 - Aug 12, 1982; Los Angeles, CA
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    NASA TECHNICAL REPORTS
  • 5
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    A perspective of power management for large space platforms (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: NASA and military applications for high power spacecraft are presently being planned. A perspective of autonomous power management for low earth orbit large space platforms is presented. A multichannel 250 kWe utility-type power subsystem is used as a baseline system. The need for automation is reviewed, based on power subsystem complexity, survivability requirements, and cost benefits. On-board versus ground management is discussed with respect to these needs. In addition, the utilization of autonomous power management to enable technology readiness of large complex power subsystems is described. Recommendations are made for further technology thrusts.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''82; Seventeenth Intersociety Energy Conversion Engineering Conference; Aug 08, 1982 - Aug 12, 1982; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    High power solar array switching regulation (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is pointed out that spacecraft utilization projections for the 1980s and beyond show a trend toward extended lifetimes and larger electric power systems. The need for improved power management and energy transfer arising in connection with this trend has resulted in the conduction of a Solar Array Switching Power Management study. A description is presented of initial development work performed in the study, taking into account the characteristics for three mission classes. Attention is given to the manned LEO platform (250-kW average load), the unmanned GEO platform (50-kW average load), and an ion propulsion orbit transfer vehicle (50- to 250 kW load).
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: In: Intersociety Energy Conversion Engineering Conference; Aug 09, 1981 - Aug 14, 1981; Atlanta, GA
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    NASA TECHNICAL REPORTS
  • 7
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    Space power distribution system technology. Volume 3: Test facility design (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The AMPS test facility is a major tool in the attainment of more economical space power. The ultimate goals of the test facility, its primary functional requirements and conceptual design, and the major equipment it contains are discussed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-171230 , NAS 1.26:171230 , TRW-34579-6001-UT-00-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Space power distribution system technology. Volume 2: Autonomous power management (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Electrical power subsystem requirements, power management system functional requirements, algorithms, power management subsystem, hardware development, and trade studies and analyses are discussed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-170853 , NAS 1.26:170853 , TRW-34579-6001-UT-00-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Space power distribution system technology. Volume 1: Reference EPS design (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The multihundred kilowatt electrical power aspects of a mannable space platform in low Earth orbit is analyzed from a cost and technology viewpoint. At the projected orbital altitudes, Shuttle launch and servicing are technically and economically viable. Power generation is specified as photovoltaic consistent with projected planning. The cost models and trades are based upon a zero interest rate (the government taxes concurrently as required), constant dollars (1980), and costs derived in the first half of 1980. Space platform utilization of up to 30 years is evaluated to fully understand the impact of resupply and replacement as satellite missions are extended. Such lifetimes are potentially realizable with Shuttle servicing capability and are economically desirable.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-170852 , NAS 1.26:170852 , TRW-34579-6001-UT-00-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Multikilowatt power electronics development for spacecraft (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Attention is given to several multikilowatt power electronic components developed by TRW for the Space Station Power Management and Distribution test bed at NASA Lewis Research Center. These components include a 12.5-kW DC-DC converter, a 6.25-kW battery charge/discharge regulator, an 82-channel sequential shunt unit, a 10-A remote power controllers, and three different types of 1-kW load converters. TRW is also monitoring the development of 120-V fuses for space applications. The authors discuss these developments and provide steady-state and dynamic performance parameters.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''91: Intersociety Energy Conversion Engineering Conference; Aug 04, 1991 - Aug 09, 1991; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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