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  • moisture effect  (1)
  • uranium exploration  (1)
  • 1990-1994  (2)
  • 1
    ISSN: 1572-879X
    Keywords: Co3O4 ; gold ; CO oxidation ; oscillation ; moisture effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effect of dry operating conditions upon the oxidation of CO over Co3O4 and Au/Co3O4 has been studied. Under dry conditions (with pretreatment and reaction gases dried at −76°C using molecular sieve traps) oxidation of CO over Co3O4 can be observed at temperatures as low as −54°C. However, without sufficient drying Co3O4 rapidly deactivates. On the other hand, the Au/Co3O4 catalyst is resistant to the presence of moisture even at low temperatures. For both the Co3O4 and Au/Co3O4 catalytic systems, strong and periodic oscillations in percentage conversion and catalyst bed temperature have been observed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-8868
    Keywords: data-directed numerical method (DdM) ; uranium exploration ; Alligator Rivers Uranium Field
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract We have attempted to develop an expert system to evaluate the favorability of uranium exploration projects using the “Data-directed Numerical Method (DdM).” We developed the system for the Macintosh personal computer, so as to facilitate the iterative processes of trial and error inherent in the DdM. In a detailed case study, we use the above system to evaluate the favorability of the Alligator Rivers Uranium Field, Northern Territory, Australia. The favorability of the target area is evaluated by considering several exploration parameters related to the geological factors controlling ore formation. The selection of appropriate exploration parameters is important to the success of the method. We then selected 15 model cells to validate each exploration parameter and also to design the exploration model by the application of the chi-square test. The result of the favorability evaluation, as displayed by the developed system, indicates that our designed exploration model is acceptable. By employing the above processes we conclude that the system using the DdM is applicable as an exploration tool and is useful in establishing an exploration model.
    Type of Medium: Electronic Resource
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