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  • MACHINE ELEMENTS AND PROCESSES  (4)
  • ELECTRONIC COMPONENTS AND CIRCUITS  (2)
  • MECHANICAL ENGINEERING  (2)
  • Anti-circular development  (1)
  • 1980-1984  (4)
  • 1970-1974  (5)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Quantitative HPTLC determination of 5-hydroxytryptamides of carboxylic acids and tryptamines in food productsPresented in part aty the 2nd Int. Symposium on Instrumental High Performance Thin Layer Chromatography May 1982, Interlaken. (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 581-582 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, HPTLC ; Anti-circular development ; On-plate derivatization ; Visible scanning ; Quantitation ; Tryptamides/serotonin ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240051020
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Meeting the challenge of a 50000-hour-life-time requirement (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Space mission requirements for the 70's have established a 50,000-hour-lifetime challenge for the mechanisms designer. This challenge may be met by two approaches: (1) development of new materials for wear-prone elements, and (2) design innovation of new electromechanical devices that do not include mechanical wear-prone components. Present state-of-the-art materials require restricted operation regarding load, speed, and power for gears, bearings, and brush-slipring components. These restrictions are discussed, and methods of improvement are suggested. The design-innovations approach is discussed and is illustrated by the design of an experimental magnetically suspended motor.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: 5th Aerospace Mech. Symp.; p 159-164
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A review of the technology of noncontacting systems (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Advanced components are the fundamental building blocks of advanced systems and spacecraft. Non-contacting elements, including magnetic bearings, brushless and ironless armature motors, rotary transformers and encoders, are discussed. Most of the information presented in this paper has been generated from a continuing program of component development. The aim of this paper is to identify some of the important design features and provide a perspective on the state of development reached to date.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: The 8th Aerospace Mech. Symp.; p 117-130
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Linear magnetic bearing (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A linear magnetic bearing system having electromagnetic vernier flux paths in shunt relation with permanent magnets, so that the vernier flux does not traverse the permanent magnet, is described. Novelty is believed to reside in providing a linear magnetic bearing having electromagnetic flux paths that bypass high reluctance permanent magnets. Particular novelty is believed to reside in providing a linear magnetic bearing with a pair of axially spaced elements having electromagnets for establishing vernier x and y axis control. The magnetic bearing system has possible use in connection with a long life reciprocating cryogenic refrigerator that may be used on the space shuttle.
    Keywords: MECHANICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    An electric motor with magnetic bearings: A concept (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Because same magnetic flux is used to control rotor as to drive it, size, weight, and power required are minimized. Constant total current keeps motor torque invarient, and absence of mechanical bearings eliminates wear and reduces frictional power loss.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: XGS-07805
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Rotary Transformer Seals Power In (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Rotary transformer originally developed for spacecraft transfers electrical power from stationary primary winding to rotating secondary without sliding contacts and very little leakage of electromagnetic radiation. Transformer has two stationary primary windings connected in parallel. Secondary, mounted on a shaft that extends out of housing, rotates between two windings of primary. Shaft of secondary is composed of electrically conducting inner and outer parts separated by an insulator. Electrical contact is made from secondary winding, through shaft, to external leads.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: GSC-12595 , NASA Tech Briefs (ISSN 0145-319X); 6; 1; P. 9
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Magnetic bearings for spacecraft (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Magnetic bearings have been successfully applied to motorized rotor systems in the multi-kilogram range, at speeds up to 1200 radians per second. These engineering models also indicated the need for continued development in specific areas to make them feasible for spacecraft applications. Significant power reductions have recently been attained. A unique magnetic circuit, combining permanent magnets with electromagnetic control, has a bidirectional forcing capability with improved current sensitivity. The multi-dimensional nature of contact-free rotor support is discussed. Stable continuous radial suspension is provided by a rotationally symmetric permanent magnet circuit. Two bearings, on a common shaft, counteract the normal instability perpendicular to the rotational axis. The axial direction is servoed to prevent contact. A new bearing technology and a new field of application for magnetics is foreseen.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-66111 , X-721-72-56
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Meeting the challenge of a 50,000-hour-lifetime requirement (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Materials and noncontacting design for 50,000 hour lifetime electromechanical components, noting magnetically suspended motor
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: AEROSPACE MECHANISMS SYMPOSIUM; Jun 15, 1970 - Jun 16, 1970; NASA GODDARD SPACE FLIGHT CENTER, GREENBELT, MD; UNITED STATES
    Format: text
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  • 9
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    Magnetic bearing and motor (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A magnetic bearing for passively suspending a rotatable element subjected to axial and radial thrust forces is disclosed. The magnetic bearing employs a taut wire stretched along the longitudinal axis of the bearing between opposed end pieces and an intermediate magnetic section. The intermediate section is segmented to provide oppositely directed magnetic flux paths between the end pieces and may include either an axially polarized magnets interposed between the segments. The end pieces, separated from the intermediate section by air gaps, control distribution of magnetic flux between the intermediate section segments. Coaxial alignment of the end pieces with the intermediate section minimizes magnetic reluctance in the flux paths endowing the bearing with self-centering characteristics when subjected to radial loads. In an alternative embodiment, pairs of oppositely wound armature coils are concentrically interposed between segments of the intermediate section in concentric arcs adjacent to radially polarized magnets to equip a magnetic bearing as a torsion drive motor. The magnetic suspension bearing disclosed provides long term reliability without maintenance with application to long term space missions such as the VISSR/VAS scanning mirror instrument in the GOES program.
    Keywords: MECHANICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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