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  • 1
    Publication Date: 2014-07-23
    Description: Due to the failure of international efforts to limit atmospheric concentrations of greenhouse gases, consideration is now being given to solar geoengineering—a deliberate intervention to limit global warming without altering the atmospheric concentration of greenhouse gases. In contrast to emission cuts, geoengineering is expected to be cheap, quick to lower temperature, and feasible through the use of a single intervention. However, geoengineering is an imperfect substitute for emission reductions and will likely have undesirable side effects, only some of which can be anticipated before geoengineering is deployed. Most importantly, because geoengineering can be undertaken unilaterally, it creates issues of governance: Who gets to decide if, when, and how geoengineering should be attempted? This article provides an introduction to the key issues surrounding the governance of this unprecedented technology. ( JEL : Q54, F53, K33)
    Keywords: Q54 - Climate ; Natural Disasters ; Global Warming, F53 - International Agreements and Observance ; International Organizations, K33 - International Law
    Print ISSN: 1750-6816
    Electronic ISSN: 1750-6824
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Political Science , Economics
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  • 2
    Publication Date: 2019-06-27
    Description: The use of coherence functions for identifying the relative contributions of multiple dynamic inputs to the measured vibration response of spacecraft components on a practical, complex structure was investigated. Data were generated by applying simultaneous vibratory and acoustic excitation to a test model (a modified Titan instrumentation truss). Up to three inputs were used. In some cases mutually coherent inputs were generated. A digital computer program was written to analyze the test data, using an approach based on iterative computational algorithms. The results showed that the coherence function technique was effective in identifying and evaluating sources of excitation, for both independent and coherent inputs. The effect of varying the number of data samples used in the necessary averaging process was briefly investigated.
    Keywords: STRUCTURAL MECHANICS
    Type: Shock and Vibration Inform. Center The Shock and Vibration Bull., Pt. 1; p 43-58
    Format: text
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  • 3
    Publication Date: 2019-07-13
    Description: The problem of determining the relative contribution of simultaneous acoustic and mechanical inputs to the response of structures under combined dynamic loads was studied. An analytical technique developed by Bendat for calculating ordinary, partial, and multiple coherence functions, using an iterative nonmatrix approach was applied to data obtained from laboratory tests on a complex structural assembly. Testing was performed in an acoustically 'live' room. Up to three random inputs, having similar spectral content and varying degrees of mutual coherence, and a single output were used. Stationary and nonstationary inputs were used. It was concluded that the technique provided an effective method of identifying sources of dynamic excitation and evaluating their relative contributions to the measured output at structural resonances, for stationary random inputs. An attempt to apply the technique to nonstationary inputs did not yield consistent results.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-3142 , MCR-78-556
    Format: application/pdf
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