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  • 1
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé La TSH-releasing hormone (TRH) tritiée a été produite. La substance radioactive est accumulée non seulement dans l'hypophyse et le rein, mais également dans la thyroïde après injection par voie endocarotidienne. La signification physiologique de l'action directe de la TRH sur la thyroïde est discutée.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Morphologie der Aortenwand, die Ultrastruktur, des Endothels und der nach Endothelentfernung haftenden Leucocyten wurden am besten erhalten durch Perfusionsfixation mit einem Druck von ca. 80 mm Hg. Demgegenüber führten Immersionsfixation und Fixation in situ durch Auftropfen von aussen zu Einengung des Lumens, wellenförmigen elastischen Lamellen, teilweiser arkadenförmiger Ablösung von Endothelzellen, Kontraktion von Endothelzellen sowie zu Lyse von Leukocyten, die nach Endothelentfernung an der Gefässwand haften.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wird die Synthese des 4-Leucin-Analogen des Arginin-vasotocins (=[Leu4, Arg8]-oxytocin) beschrieben.
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  • 4
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 5
    facet.materialart.
    Unknown
    In:  CASI
    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
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  • 6
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2016-06-07
    Description: A high torque motor with improved servo mechanism is reported. Armature windings are cast into an epoxy cylinder and armature conductors are integrally cast with an aluminum mounting ring which provides thermal conductance directly into the structure. This configuration eliminates magnetic hysteresis because there is no relative motion between the rotating magnetic field and any stationary iron. The absence of destabilization forces provides a fast electrical response compared with a typical torquer of conventional construction.
    Keywords: ELECTRONIC EQUIPMENT
    Type: Significant Accomplishments in Technol., 1972; p 53-55
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  • 7
    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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  • 8
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    In:  CASI
    Publication Date: 2013-08-31
    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
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  • 9
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2010-09-29
    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
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  • 10
    Publication Date: 2011-04-07
    Description: Electronically commutated dc motor has an active fixed field winding, and active fixed armature winding, and passive rotor. By use of brushless dc motor switching technique, motor provides continuous controllable and reversible torque without use of sliding contacts.
    Keywords: ELECTRONIC SYSTEMS
    Type: XGS-05290
    Format: application/pdf
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