首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1677篇
  免费   109篇
各国政治   150篇
工人农民   107篇
世界政治   203篇
外交国际关系   118篇
法律   898篇
中国政治   1篇
政治理论   306篇
综合类   3篇
  2023年   21篇
  2022年   18篇
  2021年   37篇
  2020年   61篇
  2019年   71篇
  2018年   97篇
  2017年   106篇
  2016年   101篇
  2015年   61篇
  2014年   92篇
  2013年   259篇
  2012年   73篇
  2011年   59篇
  2010年   35篇
  2009年   40篇
  2008年   52篇
  2007年   58篇
  2006年   53篇
  2005年   48篇
  2004年   56篇
  2003年   49篇
  2002年   33篇
  2001年   47篇
  2000年   41篇
  1999年   17篇
  1998年   14篇
  1997年   17篇
  1996年   6篇
  1995年   11篇
  1994年   12篇
  1993年   10篇
  1992年   14篇
  1991年   10篇
  1990年   9篇
  1989年   4篇
  1988年   9篇
  1987年   7篇
  1985年   4篇
  1984年   3篇
  1983年   4篇
  1982年   6篇
  1980年   4篇
  1979年   6篇
  1978年   5篇
  1973年   8篇
  1972年   3篇
  1971年   8篇
  1968年   3篇
  1966年   3篇
  1965年   5篇
排序方式: 共有1786条查询结果,搜索用时 15 毫秒
931.
932.
933.
Will paid home care erode informal support?   总被引:2,自引:0,他引:2  
One of the main barriers to the expansion of paid home care for the chronically disabled is the fear that policymakers have that it will cause friends and relatives to curtail their informal caregiving efforts. Using the first wave of the National Long-Term Care Survey, we examine whether the amount of paid home care used by disabled elderly persons had a significant influence on the amount of informal support they were receiving. Results from a two-stage least squares regression analysis suggest that the amount of informal home care received was not significantly affected by the level of formal care. This conclusion held for subgroups of formal care users most likely to exhibit substitution: those without cognitive problems, the disabled elderly with above average income, and persons who lived alone. Even the more severely disabled elderly, who are the target of most proposals to expand paid home care, did not substitute paid care for unpaid. Thus, our study suggests that an increase in paid home care will not erode informal support.  相似文献   
934.
935.
Immediately after the death of rabbits and at different times within 48 hours, we took out a part of the psoas muscle, from which we made myofibrilar preparations. The carcasses providing the muscle samples were held at two different temperatures. One group was held for 48 hours at 25 degrees C, imitating room temperature. The other group was held for 12 hours at 25 C degrees and at 25 C degrees and 12 hours at 10 C degrees, imitating daily temperature changes. Each myofibrilar sample was subjected to SDS-polyacrylamide gel electrophoresis. In addition we determined the Ca++ activated and the EGTA inhibited ATPase specific activity of the myofibrils. We found that within 48 hours the myofibrilar proteins were subjected to some characteristic proteolytic changes, which were dependant on the environmental temperature. The most interesting change was found in carcasses held constantly at 25 C degrees for 48 hours, where the EGTA inhibited ATPase activity was increased to about seven times its initial value, reflecting impairment of the troponin complex.  相似文献   
936.
937.
938.
939.
940.
In Central and Eastern Europe, outward foreign direct investment (FDI) has not yet become as a prominent factor in the region’s reintegration into the world economy as trade liberalisation used to be in the early 1990s or inward foreign direct investment is currently. In the terminology of the investment–development path, with the notable exception of the Russian Federation, the region is in stage 2, whereby inward flows are still growing faster than outward flows. This article argues that a combination of the latecomer status of the region’s transnational corporations and the transition shock can explain most of that laggard situation. It hypothesises that the enlargement of the European Union (EU) would give a major push to the outward foreign direct investment flows of Central and Eastern Europe (CEE), on condition that adequate government policies to promote those investments are put in place. The impact on the investment–development path, however, is uncertain, because accession to the EU is often accompanied by a surge in foreign direct investment inflows, too. Finally, the article also looks at the options available to deal with the specific problems of the Russian Federation in relation to capital flight, including ways of regularisation and potential return to the home economy.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号