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   8850篇
  免费   333篇
  2020年   126篇
  2019年   170篇
  2018年   181篇
  2017年   233篇
  2016年   301篇
  2015年   189篇
  2014年   176篇
  2013年   2264篇
  2012年   221篇
  2011年   266篇
  2010年   252篇
  2009年   213篇
  2008年   205篇
  2007年   176篇
  2006年   166篇
  2005年   121篇
  2004年   116篇
  2003年   106篇
  2002年   117篇
  2001年   129篇
  2000年   141篇
  1999年   174篇
  1998年   116篇
  1997年   80篇
  1996年   89篇
  1995年   98篇
  1994年   95篇
  1993年   95篇
  1992年   97篇
  1991年   75篇
  1990年   76篇
  1989年   81篇
  1988年   86篇
  1987年   97篇
  1986年   86篇
  1985年   124篇
  1984年   122篇
  1983年   130篇
  1982年   100篇
  1981年   105篇
  1980年   107篇
  1979年   103篇
  1978年   94篇
  1977年   109篇
  1976年   86篇
  1975年   95篇
  1974年   83篇
  1973年   79篇
  1972年   62篇
  1971年   65篇
排序方式: 共有9183条查询结果,搜索用时 15 毫秒
181.
182.
183.
184.
185.
Shrestha NR  Patterson JG 《对极》1990,22(2):121-155
"Malthusians maintain that rapid population growth aggravates poverty, while Marxists contend that social formations determine its nature and extent. Each perspective is incomplete, however, since it ignores the insights of the other. Latin American states, characterized by dependent capitalism formations and dominated by ruling elites, are generally incapable of solving the problems of population and poverty. Since population growth under dependent capitalism weakens labor's bargaining position against capital, reduced population growth is emphasized as a labor empowerment strategy the poor can implement on their own to improve their socioeconomic conditions."  相似文献   
186.
A longitudinal approach to migration behavior makes it possible to identify a sufficient condition for positive associations between rates of in-migration and rates of out-migration in the same regions. The longitudinal approach centers on the intervals of time that individuals spend in a region, and these intervals can be analyzed in terms of probability distributions or the equivalent hazard functions or survivor functions. Differences in the distributions of these intervals between subpopulations whose residence in a region begins with in-migration and subpopulations whose residence begins with other events are sufficient for temporal variations in rates of in-migration to produce variations in out-migration rates in subsequent periods of time. Tests for such differences are performed using data from the National Longitudinal Survey of Youth.  相似文献   
187.
"A classic case where out-migration interacted with many other geographical phenomena is provided by rural Ireland in the nineteenth century. The apparent turning point was the Great Famine of the 1840s, but the areas with the greatest suffering from starvation did not necessarily show the greatest population decline, suggesting that other forces were active. Considerable economic and social changes were already taking place before the Famine: fertility was being reduced, later marriage was becoming established and considerable emigration was already taking place. Immediately after the Famine those areas which had been hardest hit often reverted to pre-Famine conditions and did not show strong population decline until the 1870s. The Famine was a most serious event, but the modernization of Irish rural life, which linked emigration with changes in family structure, agriculture and population numbers, was more important in bringing about geographical change."  相似文献   
188.
189.
190.
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