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  • 1
    Publication Date: 1991-01-01
    Print ISSN: 0933-2480
    Electronic ISSN: 1867-2280
    Topics: Mathematics
    Published by Taylor & Francis
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  • 2
    Publication Date: 2013-08-31
    Description: Experiences of several organizations using worm gearing for spacecraft are discussed. Practical aspects and subtleties of using worm gearing for design and operation is included. Knowledge gained from these applications is analyzed, and guidelines for usage are proposed.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA, Marshall Space Flight Center, The 23rd Aerospace Mechanisms Symposium; p 291-307
    Format: application/pdf
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  • 3
    Publication Date: 2013-08-31
    Description: Latching techniques are changing from early approaches due to the advent of berthing technology. Latch selection for a given interface may be conducted by evaluating candidate capabilities which meet functional interface requirements. A judgment criteria system is presented along with an example of its use in choosing the Rollerscrew Structural Latch (RSL) for the NASA Flat Plate Interface Prototype (FPIP). Details are given on Rollerscrew operation, design, and development difficulties. A test plan is also outlined for the RSL and FPIP.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Langley Research Center, The 22nd Aerospace Mechanisms Symposium; p 29-44
    Format: application/pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of bioeconomics 1 (1999), S. 285-288 
    ISSN: 1573-6989
    Keywords: altruism ; biological evolution ; Chinese merchants ; cultural evolution ; inclusive fitness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Economics
    Notes: Abstract In her paper, Janet Landa argues that the key behind the success of the ethnically homogeneous Chinese middleman group (EHMG) is their highly developed in-group cooperation. She places the EHMG phenomenon within the framework of evolutionary biology by calling it 'a cultural transmission unit' subject to the influence of both genes and culture. Landa suggests that the individual members of the EHMG comprise the units of selection for EHMG groups much like the genes comprise the units of selection for individual organisms. However, evolution occurs through the differential survival and reproduction of individual organisms. In order to meet the criteria of biological group selection, it would have to be demonstrated that groups in competition with EHMGs had gone extinct. The fact that the EHMGs are simply faring better than their competitors is not evidence for group selection. The other reason biological group selection is not really applicable to EHMGs is that there are no physical/biological barriers to exogamous mating, and cultural barriers are intrinsically unstable.
    Type of Medium: Electronic Resource
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