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Kenneth L. Cashdollar Eric S. Weiss Nevin B. Greninger Kris Chatrathi 《Process Safety Progress》1992,11(4):247-255
This paper describes dust explosibility research in full-scale experimental mines and a 20-L laboratory chamber at the U.S. Bureau of Mines and in a 1-m3 laboratory chamber at Fike Corporation. The purpose of this research is to improve safety in mining and other industries that manufacture, process, or use combustible dusts. As part of this work, carbonaceous dusts with a wide range of volatilities and various particle size distributions were studied. Laboratory data on the minimum explosible concentrations of predispersed dusts were comparable to mine data for nominal dust loadings that were dispersed by the aerodynamic disturbance from a gas ignition zone. Recommendations are given on the limitations of small-scale testing such as “overdriving” by too strong of an ignitor. The effect of dust particle size on explosibility data is illustrated for coal and aluminum dusts. For both dusts, the finest sizes were the most hazardous. The inerting requirements for preventing explosions were also measured in both laboratory and large-scale systems. All the data show relatively good agreement between the laboratory and the large-scale tests. 相似文献
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John Weiss 《Oxford Development Studies》2018,46(1):71-82
There has been a resurgence of interest in industrial policy in higher income as well as in emerging and still developing economies, in part due to a renewed interest in the role of economic structure, with industrial policy interpreted as interventions designed to shift resources into higher return, higher growth activities. Dialogue with the private sector is critical but central to policy choice is how far policy should be applied on a vertical as opposed to a horizontal basis. This paper surveys the techniques available to guide selectivity, focusing in particular on trade-based indicators. It concludes that whilst in practice some selectivity is necessary, there is a limit as to how far this can be guided by objective indicators and flexibility and experimentation will be required in the application of policy. 相似文献
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Rivalry in trade between China and its regional neighbours in ASEAN has become a major preoccupation for many regional policy‐makers. For these reasons, strengthening the basis of empirical evidence on regional trade relations is especially important, and this paper does so in two ways. Using very detailed historical trade data, we combine econometric and trade flow analysis to elucidate patterns of export competition and underlying comparative advantage for ASEAN and China. Our findings indicate that the potential exists for both export rivalry and more extensive trade complementarity, but so do many challenges for policy makers who seek to mitigate adjustment costs and facilitate long term efficiency. Our econometric results indicate that, in the short run at least, ASEAN and China are experiencing intensified export competition in prominent third markets such as Japan and the US. More extensive trade flow analysis reveals, however, that in the long run globalisation can accommodate export growth by all the economies of East Asia, if aggregate growth can be sustained to facilitate the structural adjustments necessary for an optimal regional division of labour. 相似文献