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   2429篇
  免费   104篇
管理学   327篇
民族学   24篇
人才学   1篇
人口学   209篇
丛书文集   19篇
理论方法论   262篇
现状及发展   1篇
综合类   26篇
社会学   1330篇
统计学   334篇
  2023年   14篇
  2022年   17篇
  2021年   25篇
  2020年   54篇
  2019年   71篇
  2018年   78篇
  2017年   93篇
  2016年   83篇
  2015年   62篇
  2014年   76篇
  2013年   456篇
  2012年   105篇
  2011年   106篇
  2010年   76篇
  2009年   73篇
  2008年   98篇
  2007年   71篇
  2006年   79篇
  2005年   69篇
  2004年   65篇
  2003年   56篇
  2002年   61篇
  2001年   50篇
  2000年   42篇
  1999年   40篇
  1998年   32篇
  1997年   26篇
  1996年   36篇
  1995年   35篇
  1994年   27篇
  1993年   18篇
  1992年   20篇
  1991年   24篇
  1990年   22篇
  1989年   19篇
  1988年   13篇
  1987年   17篇
  1986年   12篇
  1985年   25篇
  1984年   14篇
  1983年   21篇
  1982年   21篇
  1981年   20篇
  1980年   16篇
  1979年   17篇
  1978年   14篇
  1976年   12篇
  1975年   10篇
  1974年   6篇
  1969年   7篇
排序方式: 共有2533条查询结果,搜索用时 109 毫秒
1.
The consumer behaviour of the poor in the long eighteenth century has attracted more historical attention in recent years. Yet, we have little understanding of whether regional factors affected consumption or how the poor’s ownership of household goods was influenced by level of poverty and the life-cycle. By focusing on Kent and drawing comparisons to other counties, this article argues that the material lives of the poor were improving by the late eighteenth century, but finds that there were distinct regional differences as the poor acquired more and better goods in London and the Home Counties than in relatively remote areas. Moreover, by using pauper inventories and labourers’ probate inventories, the research finds that the poor were not a homogeneous group with similar levels of material wealth, but should be considered in terms of different subgroups which often led very different material lives to one another due to life-cycle-related problems including sickness and old age. Labourers’ probate inventories are found to represent a minority of the poor who were materially richer than most, whilst pauper inventories appear to represent a more typical subgroup of the poor that struggled to make do and owned most types of goods in smaller numbers.  相似文献   
2.
3.
Service-learning programs are not free from challenges brought about by lack of financial support, lack of widespread commitment from professors, community agencies, and recipients of service, and lack of knowledge and insight in students directly involved in such programs. While service-learning initiatives and programs serve positive functions for organizations and individuals, rhetorical accolades for service learning can distort or omit the realities of program implementation and sustained delivery. This paper specifically explores the following challenges connected to service-learning programs: (1) pedagogical difficulties; (2) student limitations; (3) time constraints; and (4) community cooperation.  相似文献   
4.
5.
6.
Summary.  Non-ignorable missing data, a serious problem in both clinical trials and observational studies, can lead to biased inferences. Quality-of-life measures have become increasingly popular in clinical trials. However, these measures are often incompletely observed, and investigators may suspect that missing quality-of-life data are likely to be non-ignorable. Although several recent references have addressed missing covariates in survival analysis, they all required the assumption that missingness is at random or that all covariates are discrete. We present a method for estimating the parameters in the Cox proportional hazards model when missing covariates may be non-ignorable and continuous or discrete. Our method is useful in reducing the bias and improving efficiency in the presence of missing data. The methodology clearly specifies assumptions about the missing data mechanism and, through sensitivity analysis, helps investigators to understand the potential effect of missing data on study results.  相似文献   
7.
In 1985, the National Institute on Drug Abuse (NIDA) funded an ethnographic research project in San Francisco to study the needle sharing behavior of injection drug users (IDUs). The goal of the research was to develop a strategy to slow the spread of HIV among this hidden and hard to reach population of drug users and their sexual partners. This small-scale project grew into a model intervention in which bleach, condoms, and street-based education by outreach workers were employed to inform IDUs of the risk of AIDS and of methods for protecting themselves. The "reach and teach bleach" model was adopted by NIDA and implemented in a number of American cities. This study describes the development of the model intervention, the adoption of the model by NIDA as part of its National AIDS Demonstration Research (NADR) project, and the political circumstances under which the city of San Francisco applied for the NADR grant. Drawing on Social Worlds/Arena theory, and based on extensive interviews and participant observation, a sociohistorical analysis examines the initial development, implementation, and disintegration of the model outreach project and the impact of the program on drug policy in the city of San Francisco.  相似文献   
8.
9.
Despite extensive study concerning involuntary departures by U.S. House members, little has been said about voluntary departures from the House–-quit behavior. This paper has three primary purposes: (1) to establish a theoretical framework that models the full range of choices a representative faces in any given term, (2) to measure the impact of different variables that affect representatives' quit behavior, and (3) to explain why Republicans have been more likely to pursue higher office than their Democratic colleagues.  相似文献   
10.
Book‐reviews     
World Commission on Environment and Development, Our Common Future. (The Brundtland Report). Oxford, Oxford University Pres, 1987. pp. XV + 387.  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