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   4631篇
  免费   133篇
管理学   688篇
民族学   26篇
人才学   1篇
人口学   463篇
丛书文集   39篇
教育普及   1篇
理论方法论   555篇
综合类   51篇
社会学   2382篇
统计学   558篇
  2021年   28篇
  2020年   67篇
  2019年   83篇
  2018年   82篇
  2017年   133篇
  2016年   109篇
  2015年   77篇
  2014年   88篇
  2013年   794篇
  2012年   148篇
  2011年   173篇
  2010年   110篇
  2009年   134篇
  2008年   146篇
  2007年   149篇
  2006年   161篇
  2005年   144篇
  2004年   131篇
  2003年   123篇
  2002年   134篇
  2001年   88篇
  2000年   96篇
  1999年   87篇
  1998年   67篇
  1997年   72篇
  1996年   91篇
  1995年   67篇
  1994年   65篇
  1993年   59篇
  1992年   63篇
  1991年   59篇
  1990年   54篇
  1989年   63篇
  1988年   47篇
  1987年   43篇
  1986年   59篇
  1985年   59篇
  1984年   57篇
  1983年   46篇
  1982年   36篇
  1981年   43篇
  1980年   38篇
  1979年   47篇
  1978年   44篇
  1977年   34篇
  1976年   40篇
  1975年   41篇
  1974年   28篇
  1972年   17篇
  1971年   26篇
排序方式: 共有4764条查询结果,搜索用时 46 毫秒
111.
P. J. Cain and A. G. Hopkins, British Imperialism: Innovation and Expansion, 1688–1914 (1993), xiv + 490; British Imperialism: Crisis and Deconstruction, 1914–1990 (1993), xiii + 326 (Longman, London, £17.99 and £3.99).

W. D. Rubinstein, Capitalism, Culture, and Decline in Britain, 1750–1990 (1993), viii + 182 (Routledge, London, £25.00).

Stanley Chapman, Merchant Enterprise in Britain: From the Industrial Revolution to World War I (1992), xvi + 336 (Cambridge University Press, Cambridge, £40.00).  相似文献   
112.
It appears to be common practice with ridge regression to obtain a decomposition of the total sum of squares, and assign degrees of freedom, according to established least squares theory. This discussion notes the obvious fallacies of such an approach, and introduces a decomposition based on orthogonality, and degrees of freedom based on expected mean squares, for non-stochastic k.  相似文献   
113.
114.
Multistate populations with changing rates of interstate transfer are an example of compartment models and depict the experience of persons in distinct but intercommunicating states. Such models can be used in analyses of many demographic phenomena, including migration, labor force participation, and health status. This paper extends present knowledge of the relationships prevailing in such dynamic models by developing procedures that yield closed form expressions relating transfer rates to the state-specific population trajectories that they generate. The focus is on a subset of multistate models that do not recognize age and that have restricted variability in rates of transfer and natural increase. Dynamics in the two state, no-growth case, where the two time-varying transfer rates always sum to a constant value, are analyzed in depth. In specified models with any number of intercommunicating states, sine and cosine fluctuations in the transfer rates are shown to yield sine and cosine fluctuations in the numbers of persons in each state.  相似文献   
115.
116.
We compared data drawn from a random sample of 399 current assisted living residents and a subsample of 222 newly admitted residents for two groups: childless residents and residents with children. The percentage of childless residents (26%) in our study was slightly higher than U.S. population estimates of childless individuals aged 65 years and older (20%). In the overall sample, the two groups differed significantly by age, race, and women's years of education. The childless group was slightly younger, had a higher percentage of African American residents, and had more years of education than the group with children. In the subsample, we looked at demographic, functional, financial, and social characteristics and found that childless residents reported fewer diagnoses of dementia and fewer visits from a relative but more reported paying less money per month for assisted living and having private insurance than residents with children. As childlessness among older adults continues to increase, it will become increasingly important to understand how child status affects the need for and experience of long-term care.  相似文献   
117.
118.
We set out to explore the meaning of the attachment categories in the Cassidy/Marvin strange situation procedure, as employed in the home, using data from a longitudinal study of children adopted into UK families up to the age of 42 months from Romanian institutions, and of adopted children without the experience of institutional care––both groups being assessed at 4 and 6 years of age. Inter‐rater reliability was found to be good. Security (meaning the use of the parent as a secure base and no negative behavior on reunion) was the modal categorical rating in both the institution‐reared and comparison groups, but the category of anomalous non‐normative behavior (meaning a lack of any ordered attachment behavior as covered by the standard ratings), previously labeled ‘insecure‐other’, was more common in the institution‐reared children. Because this was unassociated with the usual manifestations of insecurity (such as avoidance or resistance) and because it was largely evident in interactions with the stranger, it is concluded that the adjective ‘insecure’ was not appropriate. Although this ‘insecure‐other’ category was associated with disinhibited attachment as reported by parents (meaning a lack of differentiation among adults, a willingness to go off with strangers and a lack of checking back with parents in anxiety‐provoking situations), it did not prove to be a good index of disinhibited attachment because changes over time in the ‘insecure‐other’ category were not associated with changes in the rate of disinhibited attachment. Also, whereas the rate of ‘insecure‐other’ fell markedly in the institution‐reared group between 4 and 6 years of age, it rose in the comparison group, raising queries over its meaning.  相似文献   
119.
This study examined reciprocal support networks involving extended family, friends and church members among African Americans. Our analysis examined specific patterns of reciprocal support (i.e., received only, gave only, both gave and received, neither gave or received), as well as network characteristics (i.e., contact and subjective closeness) as correlates of reciprocal support. The analysis is based on the African American subsample of the National Survey of American Life. Overall, our findings indicate that African Americans are very involved in reciprocal support networks with their extended family, friends and church members. Respondents were most extensively involved in reciprocal supports with extended family members, followed closely by friends and church networks. Network characteristics (i.e., contact and subjective closeness) were significantly and consistently associated with involvement with reciprocal support exchanges for all three networks. These and other findings are discussed in detail. This study complements previous work on the complementary roles of family, friend and congregational support networks, as well as studies of racial differences in informal support networks.  相似文献   
120.
This paper develops a dynamic model of neighborhood choice along with a computationally light multi‐step estimator. The proposed empirical framework captures observed and unobserved preference heterogeneity across households and locations in a flexible way. We estimate the model using a newly assembled data set that matches demographic information from mortgage applications to the universe of housing transactions in the San Francisco Bay Area from 1994 to 2004. The results provide the first estimates of the marginal willingness to pay for several non‐marketed amenities—neighborhood air pollution, violent crime, and racial composition—in a dynamic framework. Comparing these estimates with those from a static version of the model highlights several important biases that arise when dynamic considerations are ignored.  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