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   15243篇
  免费   197篇
  国内免费   1篇
管理学   2376篇
民族学   126篇
人才学   1篇
人口学   2718篇
丛书文集   35篇
理论方法论   1060篇
综合类   409篇
社会学   6553篇
统计学   2163篇
  2023年   46篇
  2022年   27篇
  2021年   41篇
  2020年   90篇
  2019年   140篇
  2018年   1785篇
  2017年   1816篇
  2016年   1252篇
  2015年   176篇
  2014年   191篇
  2013年   769篇
  2012年   538篇
  2011年   1268篇
  2010年   1177篇
  2009年   926篇
  2008年   975篇
  2007年   1162篇
  2006年   179篇
  2005年   386篇
  2004年   400篇
  2003年   333篇
  2002年   234篇
  2001年   128篇
  2000年   134篇
  1999年   83篇
  1998年   63篇
  1997年   77篇
  1996年   95篇
  1995年   54篇
  1994年   60篇
  1993年   53篇
  1992年   38篇
  1991年   43篇
  1990年   49篇
  1989年   45篇
  1988年   46篇
  1987年   36篇
  1986年   28篇
  1985年   40篇
  1984年   45篇
  1983年   27篇
  1982年   38篇
  1981年   38篇
  1980年   33篇
  1979年   34篇
  1978年   24篇
  1976年   36篇
  1975年   21篇
  1974年   21篇
  1973年   21篇
排序方式: 共有10000条查询结果,搜索用时 828 毫秒
81.
82.
83.
84.
Surname analysis is a potentially useful technique for identifying members of particular racial, ethnic, or language communities within a population. We review the existing state of the art for identifying persons of Hispanic or Asian origin, based on surnames distinctive of each group. We describe the logic of surname analysis, profile several available surname dictionaries, and illustrate their applications in local redistricting. Results of our ongoing validation studies suggest promising future directions for improving accuracy and broadening applications.This article is based on a paper presented at the annual Population Association of America meetings at Cincinnati, 1 April 1993.  相似文献   
85.
Using the 1990 Census of Population, Thieblot (1999) argued that black employment and the strength of the prevailing wage laws are correlated and that repeal of these laws would lead to higher black employment in construction. Analysis of the 1970 Census of Population reveals that the relative abundance of black construction workers in the group of states that eventually would repeal their laws preceded those repeals and that this is mainly due to the characteristics of Southern labor markets. This and other research cast doubt on both the strength and the existence of such a correlation.  相似文献   
86.
87.
Russia’s role in ‘animation’ of the Kyoto Protocol was crucial. Its initial vacillation on ratification was predominantly due to political bargaining with the EU. Domestic economic rationales [i.e. impacts of emission trading and Joint Implementation (JI) projects] were important to a much lesser extent and environmental motives did not seem to play any role in the decision. Since the Protocol entered into force, there have been significant delays in complete establishment of policy implementation frameworks, which are necessary for Russia to start benefiting from JI and emission trading. Only recently, in 2007, have GHG inventories and a national registry been established and the responsibilities for implementation of the Protocol and JI among the government departments have been distributed only to a certain extent. Some constraints hindering JI projects, such as vague legislation, an unfavourable economic climate, lack of commitment to JI projects, corruption, xenophobia, state and agency ‘capture’ still remain.   相似文献   
88.
This article contributes to the ongoing debate on the economic determinants of fertility behavior by addressing the role of job insecurity in couples’ intentions concerning parenthood and its timing. It starts from the hypothesis that cultural values moderate individuals’ reactions to job insecurity and the way it is related to family formation. With a systematic thematic content analysis of a set of semi-structured interviews with childless men and women around the age of 30 in eastern and western Germany, we are able to show that there are substantial differences in the consequences of job insecurity on intentions to have a first child. In western Germany, a relatively secure job career is expected to precede family formation, and this sequence of transitions is rather rigid, whereas in eastern Germany job security and family formation are thought of and practiced as parallel investments. We suggest that the lack of convergence in family formation patterns between eastern and western Germany after the unification of the country in 1990 is partially related to different attitudes toward job insecurity in the two contexts.  相似文献   
89.
90.
American options in discrete time can be priced by solving optimal stopping problems. This can be done by computing so-called continuation values, which we represent as regression functions defined recursively by using the continuation values of the next time step. We use Monte Carlo to generate data, and then we apply smoothing spline regression estimates to estimate the continuation values from these data. All parameters of the estimate are chosen data dependent. We present results concerning consistency and the estimates’ rate of convergence.  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