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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of Bilateral Trade Patterns With Panel Data (2000)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd.
    Review of international economics 8 (2000), S. 0 
    Details
    ISSN: 1467-9396
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Bilateral trade flows are examined to investigate whether trade patterns are consistent with a simple model of trade in differentiated products. In contrast to previous results in the literature, it is shown that the simple model of trade in differentiated products is often not appropriate for trade among the poor nations. Demand differences among the poor countries are shown to be at least a partial explanation for the deviations from the theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1467-9396.00207
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    Paper (German National Licenses)
    Fulltext
  • 2
    facet.materialart.
    Unknown
    Two wheeled lunar dumptruck (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design of a two wheel bulk material transport vehicle is described in detail. The design consists of a modified cylindrical bowl, two independently controlled direct drive motors, and two deformable wheels. The bowl has a carrying capacity of 2.8 m (100 ft) and is constructed of aluminum. The low speed, high HP motors are directly connected to the wheels, thus yielding only two moving parts. The wheels, specifically designed for lunar applications, utilize the chevron tread pattern for optimum traction. The vehicle is maneuvered by varying the relative angular velocities of the wheels. The bulk material being transported is unloaded by utilizing the motors to oscillate the bowl back and forth to a height at which dumping is achieved. The analytical models were tested using a scaled prototype of the lunar transport vehicle. The experimental data correlated well with theoretical predictions. Thus, the design established provides a feasible alternative for the handling of bulk material on the moon.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-182840 , NAS 1.26:182840 , ME-4182
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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