环境与发展--论发达国家与发展中国家之间的公平

环境与发展问题关系到人类的生存和发展,是当代国际社会面临的重大课题。但正是在这一问题上,发展中国家与发达国家的立场存在着根本的分歧。本文通过论述保护环境的重要性和发展经济的必要性,以代际公平和代内公平理论为基础,展示了目前发展中国家和发达国家在环境与发展问题上不可调和的矛盾。     

也谈Gu厮Luo的族源、身世及其它

文章运用汉藏文史料,对11世纪河湟地区藏族部落首领唃厮啰的族源、身世、名称等进行了考证,并就青唐城的含义进行了剖析.     

Muscle-power quality: does sex or race affect movement velocity in older adults?

To determine sex and race differences in muscle power per unit of muscle contraction, knee-extensor muscle power normalized for knee-extensor muscle volume was measured in 79 middle-aged and older adults (30 men and 49 women, age range 50-85 years). Results revealed that women displayed a 38% faster peak movement velocity than men and African Americans had a 14% lower peak movement velocity than Whites of a similar age when expressed per unit of involved muscle (p < .001). As expected, men exhibited greater knee-extensor strength and peak power per unit of muscle than women, but women had a faster knee- extension movement velocity per unit of muscle than men at the same relative strength level. Moreover, African Americans had greater knee-extensor muscle volume than Whites but exhibited lower knee-extensor strength and lower movement velocity per unit of muscle when tested at the same relative strength levels.     

Testing for abrupt breaks in variance structures with smooth changes

Abstract

We investigate the problem of testing for variance breaks in the case where the variance structure is assumed to be smoothly time-varying under the null. Since the classical tests are aimed to detect any change in the variance, they are not able to distinguish between smooth non constant variance and abrupt breaks. In this paper a new procedure for detecting variance breaks taking into account for smooth changes in the variance under the null is proposed. The finite sample properties of the test we introduce are investigated by Monte Carlo experiments. The theoretical outputs are illustrated using U.S. macroeconomic data.     

将海南建成我国南海渔业开发基地的战略构想

要使拥有广阔南海海域的海南成为南海渔业开发的基地,就应有综合开发、科技兴渔和发展名、优、特海产品的战略思想。在其战略思想指导下,建立西、南、中沙海洋捕捞基地,名、优、特海珍品养殖基地和海产品加工与储运基地,并合理地布设捕捞、养殖和加工基地