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  • 1975-1979  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Growth centres, city size, and urban migration in New Zealand (1976)
    Springer
    The annals of regional science 10 (1976), S. 41-44 
    Details
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Notes: Abstract Data have recently been published on migration flows among New Zealand's urban areas [9]. Using regression analysis on these data, this study examines the determinants of inter-city movement in New Zealand. One important feature emerging from the analysis is the revealed existence of extensive migrationamong the relatively large urban areas, as well as to the largest urban conurbation which forms the only real growth centre in the country.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291233
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Growth centres, city size, and urban migration in New Zealand (1976)
    Springer
    Details
    Publication Date: 1976-03-01
    Print ISSN: 0570-1864
    Electronic ISSN: 1432-0592
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Published by Springer
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    PAPER CURRENT
  • 3
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    Mining and beneficiation of lunar ores (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: The beneficiation of lunar plagioclase and ilmenite ores to feedstock grade permits a rapid growth of the space manufacturing economy by maximizing the production rate of metals and oxygen. A beneficiation scheme based on electrostatic and magnetic separation is preferred over conventional schemes, but such a scheme cannot be completely modeled because beneficiation processes are empirical and because some properties of lunar minerals have not been measured. To meet anticipated shipping and processing needs, the peak lunar mining rate will exceed 1000 tons/hr by the fifth year of operation. Such capabilities will be best obtained by automated mining vehicles and conveyor systems rather than trucks. It may be possible to extract about 40 kg of volatiles (60 percent H2O) by thermally processing the less than 20 micron ilmenite concentrate extracted from 130 tons of ilmenite ore. A thermodynamic analysis of an extraction process is presented.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Space Resources and Space Settlements; p 275-288
    Format: text
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    NASA TECHNICAL REPORTS
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