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Low llevel radioactive wastes are generated from reactor sources as well as fsrom non-reactor sources. In recent years, about 50,000 m3 per year of such wastes have been generated in the USA and about 10,000 m3 per year in Canada. Direct disposal of these wasters in shallow ground has been a favoured method in both countries in the past. However, with recent advances in waste management. technologies are being applied to achieve optimum goals in terms of protection of human health and safety and the environment, as well as cost-effectiveness. These technologies must be applied from the generation sources through waste minimization and optimum segregation-followed by waste processing, conditioning, storage, and disposal. A number of technologies are available and can be applied as appropriate, given the physical, chemical, and radiological characteristics of the waste. Interim and retrievable storage can be accomplished in a wide variety of storage structures, and several types of engineered disposal facility designs are now available. By applying an integrated approach to radioactive waste management. potential advers impacts on human health and safety and the environment can be minimized.  相似文献   
2.
Low llevel radioactive wastes are generated from reactor sources as well as fsrom non-reactor sources. In recent years, about 50,000 m3 per year of such wastes have been generated in the USA and about 10,000 m3 per year in Canada. Direct disposal of these wasters in shallow ground has been a favoured method in both countries in the past. However, with recent advances in waste management. technologies are being applied to achieve optimum goals in terms of protection of human health and safety and the environment, as well as cost-effectiveness. These technologies must be applied from the generation sources through waste minimization and optimum segregation-followed by waste processing, conditioning, storage, and disposal. A number of technologies are available and can be applied as appropriate, given the physical, chemical, and radiological characteristics of the waste. Interim and retrievable storage can be accomplished in a wide variety of storage structures, and several types of engineered disposal facility designs are now available. By applying an integrated approach to radioactive waste management. potential advers impacts on human health and safety and the environment can be minimized.  相似文献   
3.
The effect of alternative property rights regimes on the choicebetween taking an object and acquiring it via a consensual exchangeis experimentally explored in a two-period screening game. Resultsare generally consistent with equilibrium predictions, suggestingthat property rights regimes have a significant impact on observedbehavior.  相似文献   
4.
Buying recent winners and shorting recent losers guaranteestime-varying factor exposures in accordance with the performanceof common risk factors during the ranking period. Adjusted forthis dynamic risk exposure, momentum profits are remarkablystable across subperiods of the entire post-1926 era. Factormodels can explain 95% of winner or loser return variability,but cannot explain their mean return components are more profitablethan those based on total returns. Neither industry effectsnor cross-sectional differences in expected returns are theprimary cause of the momentum phenomenon.  相似文献   
5.
In this article the reform of academic tenure is examined in the United Kingdom. We test the hypothesis that reforming tenure may have reduced performance in the universities. The years following the 1988 Education Reform Act provide an interesting natural experiment, as the broad effect of the legislation was to soften (though not to remove) tenure in universities in the United Kingdom. It is concluded that the act has not adversely affected efficiency as some writers have predicted it would.  相似文献   
6.
Firm organization determines how coworkers communicate and howinformation flows within the firm. Banking, accounting, consulting,and legal firms process proprietary information which theirclients wish to protect. The firm's ability to safeguard andmanage information determines its market demand. Yet employeesmay leak and otherwise abuse information to enhance their personalperformance and wealth. This article analyzes how bureaucraciesare erected within the firm to control information flows andprotect clients.  相似文献   
7.
In light of the large and sustained rise in real interest ratesin the late 1970s and early 1980s, this paper reviews: (i) thetheoretical discussion on the determination of nominal and realinterest rates; (ii) the factors determining real interest rates;and (iii) problems of defining and measuring the real rate.We go on to examine the historical record of real interest ratesin France, Germany, the UK, and the USA since 1875. We findthat high real rates since 1980 seem to be a return to a long-runnorm, and it is the period from the Second World War to 1979that represents a more natural period in which to investigatean abrupt change of behaviour for real interest rates.  相似文献   
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