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   13138篇
  免费   375篇
管理学   1838篇
民族学   60篇
人才学   1篇
人口学   1344篇
丛书文集   71篇
教育普及   1篇
理论方法论   1186篇
现状及发展   1篇
综合类   144篇
社会学   6486篇
统计学   2381篇
  2023年   83篇
  2021年   68篇
  2020年   187篇
  2019年   273篇
  2018年   318篇
  2017年   439篇
  2016年   355篇
  2015年   228篇
  2014年   292篇
  2013年   2300篇
  2012年   454篇
  2011年   393篇
  2010年   309篇
  2009年   300篇
  2008年   338篇
  2007年   337篇
  2006年   303篇
  2005年   303篇
  2004年   299篇
  2003年   263篇
  2002年   295篇
  2001年   333篇
  2000年   323篇
  1999年   309篇
  1998年   223篇
  1997年   203篇
  1996年   197篇
  1995年   189篇
  1994年   162篇
  1993年   173篇
  1992年   190篇
  1991年   171篇
  1990年   180篇
  1989年   201篇
  1988年   168篇
  1987年   147篇
  1986年   158篇
  1985年   189篇
  1984年   183篇
  1983年   173篇
  1982年   139篇
  1981年   112篇
  1980年   118篇
  1979年   145篇
  1978年   97篇
  1977年   98篇
  1976年   98篇
  1975年   83篇
  1974年   87篇
  1973年   76篇
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
31.
Informal caregivers of individuals with Alzheimer's disease spend a considerable amount of time providing care. In this paper, we use Grossman's health production and Becker's time allocation models to develop a model of informal care provision to elderly dementia patients. In our model, time inputs produce caregiving services, which provides utility to the caregiver, but reduces leisure. We assume that time is less productive of services on the margin as the disease progresses. In this framework, an increase in patients' disease severity does not necessarily increase informal caregiver time input. The cost of formal care establishes a reservation price for informal caregiving. When the costs of informal caregiving rise above this reservation level, the patient is institutionalized. We test empirically the effect of deterioration in the patients' condition, proxied by both disease severity and dementia problem behavior, on informal caregiving time. We find that dementia-related problem behaviors and functional limitations significantly increase inputs of informal caregiving time. Patients' problem behavior exerts a modifying effect on functional limitations, and patients' comorbidities have no effect on informal caregiving time.  相似文献   
32.
33.
The authors examine facilitative aspects of field research with deviant street populations. Based on the authors' research with the homeless and with male street prostitutes, the facilitative aspects include access to settings, social relationships, acquisition of information, and the maintenance of researcher interest. The authors argue that in each of these aspects street deviants may in some ways be easier to study than other populations. The paper concludes with suggestions for maximizing the efficiency and quality of fieldwork with specific deviant populations.  相似文献   
34.
35.
In our zeal to deal with alcohol and drug abuse, we may have a distorted picture of what the majority of college students actually think about alcohol and drug use. Students in this study done at a public university located in the Deep South report being generally intolerant of substance abuse.  相似文献   
36.
Summary Meta-analyses of sets of clinical trials often combine risk differences from several 2×2 tables according to a random-effects model. The DerSimonian-Laird random-effects procedure, widely used for estimating the populaton mean risk difference, weights the risk difference from each primary study inversely proportional to an estimate of its variance (the sum of the between-study variance and the conditional within-study variance). Because those weights are not independent of the risk differences, however, the procedure sometimes exhibits bias and unnatural behavior. The present paper proposes a modified weighting scheme that uses the unconditional within-study variance to avoid this source of bias. The modified procedure has variance closer to that available from weighting by ideal weights when such weights are known. We studied the modified procedure in extensive simulation experiments using situations whose parameters resemble those of actual studies in medical research. For comparison we also included two unbiased procedures, the unweighted mean and a sample-size-weighted mean; their relative variability depends on the extent of heterogeneity among the primary studies. An example illustrates the application of the procedures to actual data and the differences among the results. This research was supported by Grant HS 05936 from the Agency for Health Care Policy and Research to Harvard University.  相似文献   
37.
38.
This paper focuses upon an as yet under-explored factor believed to underlie most managerial and organizational behavior variables—work ideology. Work ideologies are surveyed for several convenience samples of students and managers to show their ability to be studied and that patterned differences may be discovered. In addition, the historical origins and meanings of four major work ideologies are discussed.  相似文献   
39.
This paper studies a robust approach to the analysis of cell pedigree data, building on the work of Huggins & Marschner (1991) which discussed M-estimation for the so-called bifurcating autoregressive process. The study allows for incomplete observation of the pedigree, and incorporates the possibility of additive effects outliers, as discussed in the time series literature. Some properties of the proposed estimation procedure are studied, including a Monte Carlo investigation of robustness in the presence of contamination.  相似文献   
40.
SUMMARY. The past decade has shown increased awareness, concern and understanding about the extent of child abuse, particularly sexual abuse, and the caring agencies response to listen to and to support the young victims. This article looks at the response of the police service over that decade to meet such demands and to work jointly and responsively with social services to further the welfare and protection of children. It also examines the constraints and limitations of the police and social services when they attempt to uphold the rights of child victims and to gain redress through the criminal justice system  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