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  • 1975-1979  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Some problems in the use of Almon's technique in the estimation of distributed lags (1977)
    Springer
    Empirical economics 2 (1977), S. 175-193 
    Details
    ISSN: 1435-8921
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Summary This paper investigates some of the difficulties of using Almon's technique in the estimation of distributed lags. After a theoretical discussion of the Almon model, formulated both in terms of transformation of the independent variable(s) and as a set of constraints on the parameters, a critical analysis of the conventional criteria for choosing the “best” model (such as goodness of fit, the statistical significance of the individual parameter estimate or their sums, and an analysis of autocorrelation) demonstrates the problems of choosing the appropriate combination of lag length and degree of polynomial. These problems are illustrated by an empirical example, which re-estimates some equations from an earlier study of financial capital flows in the U.S. balance of payments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01760398
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    Paper (German National Licenses)
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  • 2
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    Scrubbing liquors for nitrogen tetroxide (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Once it was determined that the wet scrubbing concept was the most practical solution to the N2O4 emission problem, it became important to optimize the composition of the scrubbing liquor. Several reagents were cited in the literature as being advantageous in scrubbing NO2. Experiments were conducted on a model wet scrubber in order to verify and rank the performances of these scrubbing liquors. The most efficient scrubbing liquor found experimentally was a 10% sodium sulfite solution.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA. Kennedy Space Center Proc. of the NASA(Fla. Inst. of Tech. Environ. Eng. Conf. on Nitrogen Tetroxide; p 23-60
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Handbook on Hypergolic Propellant Discharges and Disposal (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The efficiency of all treatment methods formerly or currently used in treating chemical wastes is assessed with emphasis on the disposal of hypergolic propellants. Maximum focus is on the space shuttle propellants MMH and N2O4. Except for hydrogen peroxide oxidizers, all the propellants are nitrogen based and can be potentially reduced to valuable plant nutrients. In theory, all the propellants can be reduced to carbon, hydrogen, nitrogen, and oxygen, except of fuming nitric acid which contains a small amount of fluorine. Appendices cover: (1) a general design criteria for disposal ponds; (2) thermal aspects of reaction in dilute solution; (3) gas bubble growth, detachment, and rise (4) absorption scrubber fundamentals and descriptions; (5) separation of a propellant vapor from a helium stream by permeation; and (6) atmospheric emission limits.
    Keywords: PROPELLANTS AND FUELS
    Type: NASA-CR-166826 , DD-MDD-41
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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