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   2588篇
  免费   53篇
管理学   417篇
民族学   21篇
人才学   1篇
人口学   213篇
丛书文集   23篇
理论方法论   219篇
综合类   24篇
社会学   1371篇
统计学   352篇
  2021年   13篇
  2020年   26篇
  2019年   30篇
  2018年   52篇
  2017年   66篇
  2016年   55篇
  2015年   34篇
  2014年   53篇
  2013年   487篇
  2012年   60篇
  2011年   88篇
  2010年   68篇
  2009年   61篇
  2008年   64篇
  2007年   87篇
  2006年   56篇
  2005年   68篇
  2004年   61篇
  2003年   63篇
  2002年   56篇
  2001年   44篇
  2000年   43篇
  1999年   39篇
  1998年   50篇
  1997年   55篇
  1996年   49篇
  1995年   51篇
  1994年   39篇
  1993年   48篇
  1992年   46篇
  1991年   45篇
  1990年   41篇
  1989年   31篇
  1988年   30篇
  1987年   35篇
  1986年   26篇
  1985年   32篇
  1984年   32篇
  1983年   39篇
  1982年   33篇
  1981年   30篇
  1980年   29篇
  1979年   26篇
  1978年   34篇
  1977年   17篇
  1976年   25篇
  1975年   20篇
  1974年   25篇
  1973年   10篇
  1971年   11篇
排序方式: 共有2641条查询结果,搜索用时 207 毫秒
191.
192.
193.
The hypothesis proposed earlier seems to be supported by the analysis of U.S. fertility. Urbanization was consistently negatively correlated with thelevel of fertility in 1810, 1860, 1920, and 1940. Urbanization was not significantly correlated with thedecline of fertility in the period, i.e. from 1800 to 1860; from 1860 to 1920; and from 1920 to 1940. For the period from 1800 to 1860, however, the decline was closely associated with a proxy variable for what is called the spirit of autonomy, i.e., a feeling of control over one's life. It is hypothesized that this sense of control extended to control over fertility. After 1860 the ideas became so widespread that they were no longer associated with any particular group, region, religion, or class. It was just a matter of time until the ideas spread slowly to all groups.  相似文献   
194.
195.
Health risk beliefs of homeowners near a landfill site were assessed in a survey and compared to expert judgments of the health risks of living near the site. A bimodal distribution of health risk beliefs suggested sharp disagreement between the experts and at least some of the residents. Correlates of high risk beliefs included perception of odor from the site, exposure to media coverage of the problem, having children living at home, age (younger respondents more concerned), and gender (females more concerned). An aggregated neighborhood health risk belief predicted reductions in home prices even after controlling for home physical characteristics, such as size and other disamenities such as proximity to a freeway. In the 4100 homes near the site, the estimated depression in property values was estimated to total about $40.2 million before the site was closed and to be about $19.7 million after closure. Implications of these results for community conflict and for benefit-cost analysis of hazard site remediation are discussed.  相似文献   
196.
197.
198.
This paper discusses the opposition of civil society to nonferrous metals mining in Montana. The mineral resources and mining history of Montana are discussed, as is the vibrant civil society of that state. Montana’s civil society has opposed mining due to its environmental effects, particularly upon areas of high conservation value. This opposition has involved litigation and the implementation of a ban on the use of cyanide by the mining industry. The paper concludes with a discussion of whether this opposition to mining has damaged the economy of the state and Montana’s future as an example of the “New West,” wherein amenities based growth act as the principal agent of economic activity.  相似文献   
199.
As a result of the Chernobyl nuclear power plant accident in 1986, large forested areas in Europe were contaminated by radionuclides. Extensive societal pressure has been exerted to decrease the radiation dose to the population and to the environment. Thus, in making abatement and remediation policy decisions not only economic costs, but also human and environmental risk assessment are desired. Forest remediation by organic layer removal, one of the most promising cleanup policies, is considered in this paper. Ecological risk assessment requires evaluation of the radionuclide distribution in forests. The FORESTPATH model(1,2) is used for predicting the radionuclide fate in forest compartments after deposition as well as for evaluating the application of the remedial policy. Time of intervention and radionuclide deposition profile was predicted as being crucial for the remediation efficiency. Risk assessment conducted for a critical group of forest users in Belarus shows that consumption of forest products (berries and mushrooms) leads to about 0.004% risk of a fatal cancer. Cost-benefit analysis for forest cleanup suggests that complete removal of organic layer is too expensive for application in Belarus.  相似文献   
200.
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