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   92938篇
  免费   2953篇
  国内免费   3篇
管理学   12495篇
民族学   560篇
人才学   25篇
人口学   7445篇
丛书文集   532篇
教育普及   2篇
理论方法论   9518篇
现状及发展   1篇
综合类   2225篇
社会学   43957篇
统计学   19134篇
  2023年   510篇
  2021年   574篇
  2020年   1522篇
  2019年   2229篇
  2018年   2175篇
  2017年   3232篇
  2016年   2430篇
  2015年   2047篇
  2014年   2654篇
  2013年   18910篇
  2012年   2579篇
  2011年   2354篇
  2010年   2063篇
  2009年   2250篇
  2008年   2163篇
  2007年   1985篇
  2006年   2175篇
  2005年   2357篇
  2004年   2241篇
  2003年   1957篇
  2002年   2060篇
  2001年   2091篇
  2000年   1865篇
  1999年   1749篇
  1998年   1534篇
  1997年   1384篇
  1996年   1338篇
  1995年   1362篇
  1994年   1340篇
  1993年   1316篇
  1992年   1353篇
  1991年   1274篇
  1990年   1237篇
  1989年   1094篇
  1988年   1162篇
  1987年   1040篇
  1986年   962篇
  1985年   1122篇
  1984年   1176篇
  1983年   1063篇
  1982年   975篇
  1981年   885篇
  1980年   843篇
  1979年   894篇
  1978年   803篇
  1977年   731篇
  1976年   681篇
  1975年   656篇
  1974年   485篇
  1973年   408篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
121.
We present a new characterization technique extracted from a well known idea in statistical inference. We use the partial derivative of the logarithm of the survival function in connection with truncated moments to characterize several probability distributions. Our methods introduce a unified technique to obtain several well known results in a unified way.  相似文献   
122.
123.
124.
125.
What do voters really know about party platforms and how do they perceive the contents? Are there any relationships between party election platforms and electoral behavior? Despite of much research on parties, there are hardly any answers to these questions. If political parties devise programmes in order to influence political attitudes or electoral behavior, it will be necessary that these programmes are read by people. But it seems to be unclear if and how people do so. This article shows clearly that voters don’t know much about party manifestoes. Still, programmes are more important for voters than many people believe. Programmes are also an important factor for electoral behavior. But there is still a lack of data to get evident results.  相似文献   
126.
127.
Using an increasing returns specification for distribution, an inverted U pattern between the share of distribution in gross domestic product and the level of development is shown to arise. A cross-section time-series data set is constructed and merged with one used to analyze the service sector. In contrast to the rising pattern found for services, an average time-series relation that exhibits an inverted U pattern is established. The empirical results are robust, for example, to choice of functional form and country and time period coverage. A similar pattern is found in the average cross-section (country) relation between distribution and development.  相似文献   
128.
Institutional Constraints and Deforestation: An Application to Mexico   总被引:1,自引:0,他引:1  
Following North (1990), this article hypothesizes that effective rural institutions may impose additional costs on tropical deforestation through agricultural conversion. This allows a formal agricultural household analysis of institutional constraints on deforestation and therefore a method of empirically testing whether there is any significant difference in the actual level of forest land conversion under institutional constraints compared to the level of conversion under pure open access. A dynamic panel analysis for agricultural planted area in Mexico at state level and over the 1960–85 period confirms that institutional constraints on land clearing affected deforestation during the pre-NAFTA era.  相似文献   
129.
In this essay we discuss changes in the cultural meaning and significance of time in postmodernism. We begin by examining the experience of time and space in the Middle Ages and its radical alteration following the Renaissance. After a relatively brief period of optimism during the Enlightenment regarding the scientific control over time and space, a new crisis beginning in the mid‐nineteenth century emphasized the increasing disjuncture between external, objective notions of time and the way time was experienced subjectively. We argue that the current literature on time and post‐modernity is best understood in this context, where earlier disequilibriating effects brought about by modern technologies are exacerbated by new developments in transportation and communications technology. Here we discuss the particular effects on topics of interest to social scientists such as changes in notions of personal identity and the effacement of historical time. We conclude with a call for more empirically grounded work on questions concerning time in postmodernism. We lament the paucity of concrete data as well as the excess of useless polemics and recommend several researchers already conducting work in this field.  相似文献   
130.
This study tests a hypothesis that Mexican foreign‐born immigrants who came to the United States for economic reasons naturalize less often than Cubans who immigrate for political reasons. It uses information from the Panel Study of Income Dynamics, Latino Sample, a national sample of 7,453 respondents from the 1989 Latino National Political Survey (LNPS) and the 1990 Panel Study of Income Dynamics (PSID). Ordinal logistic regression is used to examine the hypothesis. The results indicate that while more Mexicans plan to apply or have applied for naturalization, proportionately more Cubans than Mexicans have naturalized. Cuban political immigrants who came to the United States during the first half of the 1960s naturalize more often than their Mexican counterparts. However, the effect of ethnic identity on naturalization is mediated by a number of other predictors of naturalization such as gender, race, urban residence, socioeconomic status and acculturation.  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