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  • 11
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    (abstract) A Brief, Selective Review of Thermal Cycling Fatigue in Eutectic Tin-Lead Solder (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: This paper reviews selected parts of the current literature relevant to thermo-mechanical fatigue mechanisms in eutectic tin-lead solder, and suggests a general outline to account for some observed failures. The field is found to be complex. One recent experimental study finds some failure modes to be sensitive to joint geometry. Attempts to extrapolate from test environments to service environments have had only limited success. Much work remains to be done before fatigue failures in this material can be considered as under practical control.
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Thermal Cycling Fatigue in DIPs Mounted with Eutectic Tin-Lead Solder Joints in Stub and Gullwing Geometries (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: It has long been known that solder joints under mechanical stress are subject to failure. In early electronic systems, such failures were avoided primarily by avoiding the use of solder as a mechanical structural component. The rule was first to make sound wire connections that did not depend mechanically on solder, and only then to solder them. Careful design and miniaturization in modern electronic systems limits the mechanical stresses exerted on solder joints to values less than their yield points, and these joints have become integral parts of the mechanical structures. Unfortunately, while these joints are strong enough when new, they have proven vulnerable to fatigue failures as they age. Details of the fatigue process are poorly understood, making predictions of expected lifetimes difficult.
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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    Radiation data definitions and compilation for equipment qualification data bank (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Dose definitions, physical properties, mechanical properties, electrical properties, and particle definitions are listed for insulators and dielectrics, elastomeric seals and gaskets, lubricants, adhesives, and coatings.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-176259 , NAS 1.26:176259 , NPO-16426/5907
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 14
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    Synthetic Organic Materials in Nuclear Powerplants (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Report aids plant designers and qualification engineers in ensuring that organic materials in nuclear powerplants will perform satisfactorily in such safety-related equipment as insulation on motor windings, pump diaphragms, motor and pump lubricants, and pump seals and gaskets. Report provides information for service that may include both mild and harsh nuclear environments.
    Keywords: MATERIALS
    Type: NPO-16424 , NASA Tech Briefs (ISSN 0145-319X); 9; 2; P. 103
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    NASA TECHNICAL REPORTS
  • 15
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    Packaging techniques for low-altitude Venus balloons beacon (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of a specific design project for the Venus balloon beacon, in which a microwave beacon is required to operate for a limited time at high temperature (350 C) and at high pressure, (10 bars). In a chemically hostile environment after surviving large mechanical shock forces (up to 280 gs) are discussed. It was found that many existing, commerically-available component can be used in such a design with only minor modifications. A further result is that a crude (and consequently low-cost) test program can be designed to identify and select promising commercial components.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA. Lewis Research Center Proc. of the Conf. on High Temp. Electron.; p 117-121
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 16
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    Radiation Effects on Polymer Properties (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report compiles data on effects of radiation on physical properties of synthetic organic materials. Emphasis on materials of interest to nuclear-equipment and nuclear-reactor designers. Data covers five categories of polymeric materials: Insulators, elastomeric seals and gaskets, lubricants, adhesives, and coatings. More than 250 materials represented.
    Keywords: MATERIALS
    Type: NPO-16426 , NASA Tech Briefs (ISSN 0145-319X); 11; 1; P. 41
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
    Electronic Resource
    Electronic Resource
    The structural and functional interrelationships of muscarinic acetylcholine receptor subtypes (1989)
    New York, NY : Wiley-Blackwell
    BioEssays 10 (1989), S. 54-57 
    Details
    ISSN: 0265-9247
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Molecular cloning of the genes encoding the muscarinic acetylcholine receptors has shwon that receptor subtypes classified on the basis of pharmacological properties are related polypeptides encoded by distinct genes. These studies have laso revealed the existence of novel muscarinic receptor subtypes. Functional analysis of each of the subtypes expressed in mammalian cells indicates that the different subtypes activate distinct biochemical pathways, a finding that explains the tissue-specific physiological response elicited by the neurotransmitter, acetylcholine.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bies.950100205
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    Paper (German National Licenses)
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