全文获取类型
收费全文 | 1677篇 |
免费 | 109篇 |
专业分类
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 |
出版年
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