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  • 1
    Electronic Resource
    Electronic Resource
    Gametogenesis in culture by gametocytes of Plasmodium falciparum (1977)
    [s.l.] : Nature Publishing Group
    Nature 270 (1977), S. 240-241 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The isolate of P. falciparum used in this study was adapted to culture on 4 January 1977 from the blood of an individual who had become infected during a visit to Zaire from September to December 1976. This isolate, designated the Z strain, was obtained with the kind cooperation of Dr David Wyler. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/270240a0
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Gametogenesis in culture by gametocytes of Plasmodium falciparum (1977)
    Springer Nature
    Details
    Publication Date: 1977-11-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 3
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    NASA Capabilities That Could Impact Terrestrial Smart Grids of the Future (2015)
    In:  CASI
    Details
    Publication Date: 2015-12-11
    Description: Incremental steps to steadily build, test, refine, and qualify capabilities that lead to affordable flight elements and a deep space capability. Potential Deep Space Vehicle Power system characteristics: power 10 kilowatts average; two independent power channels with multi-level cross-strapping; solar array power 24 plus kilowatts; multi-junction arrays; lithium Ion battery storage 200 plus ampere-hours; sized for deep space or low lunar orbit operation; distribution120 volts secondary (SAE AS 5698); 2 kilowatt power transfer between vehicles.
    Keywords: Lunar and Planetary Science and Exploration; Electronics and Electrical Engineering
    Type: GRC-E-DAA-TN21535 , Electro Expo; 11-12 Mar. 2015; Cleveland, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Series Connected Converter for Control of Multi-Bus Spacecraft Power Utility (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The invention provides a power system using series connected regulators. Power from a source, such as a solar array, is processed through the regulators and provided to corresponding buses used to charge a battery and supply loads. The regulators employ a bypass loop around a DC-DC converter. The bypass loop connects a hot input of the converter to a return output, preferably though an inductor. Part of the current from the source passes through the bypass loop to the power bus. The converter bucks or boosts the voltage from the source to maintain the desired voltage at the bus. Thus, only part of the power is processed through the converter. The converter can also be used without the bypass loop to provide isolation. All of the converters can be substantially identical.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Overview of NASA Power Technologies for Space and Aero Applications (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: To achieve the ambitious goals that NASA has outlined for the next decades considerable development of power technology will be necessary. This presentation outlines the development objectives for both the space and aero applications. It further looks at the various power technologies that support these objectives and examines drivers that will be a driving force for future development.
    Keywords: Spacecraft Propulsion and Power; Energy Production and Conversion
    Type: GRC-E-DAA-TN18483 , IEEE Cleveland Power and Energy Society Meeting; Oct 16, 2014; Lorain, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Overview of Intelligent Power Controller Development for Human Deep Space Exploration (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Intelligent or autonomous control of an entire spacecraft is a major technology that must be developed to enable NASA to meet its human exploration goals. NASA's current long term human space platform, the International Space Station, is in low Earth orbit with almost continuous communication with the ground based mission control. This permits the near real-time control by the ground of all of the core systems including power. As NASA moves beyond low Earth orbit, the issues of communication time-lag and lack of communication bandwidth beyond geosynchronous orbit does not permit this type of operation. This paper presents the work currently ongoing at NASA to develop an architecture for an autonomous power control system as well as the effort to assemble that controller into the framework of the vehicle mission manager and other subsystem controllers to enable autonomous control of the complete spacecraft. Due to the common problems faced in both space power systems and terrestrial power system, the potential for spin-off applications of this technology for use in micro-grids located at the edge or user end of terrestrial power grids for peak power accommodation and reliability are described.
    Keywords: Engineering (General)
    Type: NASA/TM-2014-218380 , AIAA Paper 2014-3833 , E-18963 , GRC-E-DAA-TN16099 , International Energy Conversion Engineering Conference (IECEC); Jul 28, 2014 - Jul 30, 2014; Cleveland, OH; United States
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    NASA TECHNICAL REPORTS
  • 7
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    Overview of Intelligent Power Controller Development for Human Deep Space Exploration (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Intelligent or autonomous control of an entire spacecraft is a major technology that must be developed to enable NASA to meet its human exploration goals. NASAs current long term human space platform, the International Space Station, is in low earth orbit with almost continuous communication with the ground based mission control. This permits the near real-time control by the ground of all of the core systems including power. As NASA moves beyond Low Earth Orbit, the issues of communication time-lag and lack of communication bandwidth beyond geosynchronous orbit does not permit this type of operation. This paper presents the work currently ongoing at NASA to develop an architecture for an autonomous power control system as well as the effort to assemble that controller into the framework of the vehicle mission manager and other subsystem controllers to enable autonomous control of the complete spacecraft. Due to the common problems faced in both space power systems and terrestrial power system, the potential for spin-off applications of this technology for use in micro-grids located at the edge or user end of terrestrial power grids for peak power accommodation and reliability are described.
    Keywords: Energy Production and Conversion; Spacecraft Propulsion and Power
    Type: GRC-E-DAA-TN16436 , International Energy Conversion Engineering Conference; Jul 28, 2014 - Jul 30, 2014; Cleveland, Ohio; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Overview of Intelligent Power Controller Development for Human Deep Space Exploration (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Intelligent or autonomous control of an entire spacecraft is a major technology that must be developed to enable NASA to meet its human exploration goals. NASA's current long term human space platform, the International Space Station, is in low earth orbit with almost continuous communication with the ground based mission control. This permits the near real-time control by the ground of all of the core systems including power. As NASA moves beyond Low Earth Orbit, the issues of communication time-lag and lack of communication bandwidth beyond geosynchronous orbit does not permit this type of operation. This paper presents the work currently ongoing at NASA to develop an architecture for an autonomous power control system as well as the effort to assemble that controller into the framework of the vehicle mission manager and other subsystem controllers to enable autonomous control of the complete spacecraft. Due to the common problems faced in both space power systems and terrestrial power system, the potential for spin-off applications of this technology for use in micro-grids located at the edge or user end of terrestrial power grids for peak power accommodation and reliability are described.
    Keywords: Engineering (General)
    Type: GRC-E-DAA-TN15706 , International Energy Conversion Engineering Conference; Jul 28, 2014 - Jul 30, 2014; Cleveland, OH; United States
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    NASA TECHNICAL REPORTS
  • 9
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    The Need for Intelligent Control of Space Power Systems (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: As manned spacecraft venture farther from Earth, the need for reliable, autonomous control of vehicle subsystems becomes critical. This is particularly true for the electrical power system which is critical to every other system. Autonomy can not be achieved by simple scripting techniques due to the communication latency times and the difficulty associated with failures (or combinations of failures) that need to be handled in as graceful a manner as possible to ensure system availability. Therefore an intelligent control system must be developed that can respond to disturbances and failures in a robust manner and ensure that critical system loads are served and all system constraints are respected.
    Keywords: Spacecraft Design, Testing and Performance
    Type: GRC-E-DAA-TN9318 , IEEE EnergyTech 2013; May 21, 2013 - May 23, 2013; Cleveland, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Proposal and Development of a High Voltage Variable Frequency Alternating Current Power System for Hybrid Electric Aircraft (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The development of ultra-efficient commercial vehicles and the transition to low-carbon emission propulsion are seen as strategic thrust paths within NASA Aeronautics. A critical enabler to these paths comes in the form of hybrid electric propulsion systems. For megawatt-class systems, the best power system topology for these hybrid electric propulsion systems is debatable. Current proposals within NASA and the Aero community suggest using a combination of alternating current (AC) and direct current (DC) for power generation, transmission, and distribution. This paper proposes an alternative to the current thought model through the use of a primarily high voltage AC power system, supported by the Convergent Aeronautics Solutions (CAS) Project. This system relies heavily on the use of doubly-fed induction machines (DFIMs), which provide high power densities, minimal power conversion, and variable speed operation. The paper presents background on the activity along with the system architecture, development status, and preliminary results.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN46211 , Incorporating Strathclyde Fault Management Technology; Aug 22, 2017; Cleveland, OH; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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