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   5370篇
  免费   112篇
管理学   703篇
民族学   24篇
人口学   534篇
丛书文集   21篇
教育普及   1篇
理论方法论   518篇
综合类   59篇
社会学   2553篇
统计学   1069篇
  2023年   34篇
  2021年   51篇
  2020年   95篇
  2019年   121篇
  2018年   133篇
  2017年   205篇
  2016年   151篇
  2015年   86篇
  2014年   141篇
  2013年   814篇
  2012年   169篇
  2011年   156篇
  2010年   131篇
  2009年   112篇
  2008年   148篇
  2007年   141篇
  2006年   162篇
  2005年   120篇
  2004年   115篇
  2003年   83篇
  2002年   105篇
  2001年   135篇
  2000年   132篇
  1999年   139篇
  1998年   108篇
  1997年   90篇
  1996年   96篇
  1995年   69篇
  1994年   62篇
  1993年   88篇
  1992年   90篇
  1991年   100篇
  1990年   79篇
  1989年   79篇
  1988年   62篇
  1987年   71篇
  1986年   62篇
  1985年   75篇
  1984年   67篇
  1983年   70篇
  1982年   44篇
  1981年   41篇
  1980年   40篇
  1979年   51篇
  1978年   38篇
  1977年   33篇
  1976年   35篇
  1975年   32篇
  1974年   40篇
  1973年   29篇
排序方式: 共有5482条查询结果,搜索用时 15 毫秒
71.
Technologies with significant implications for expenditures continue to reach the health care system. These technologies range from orphan drugs/biologicals used to treat rare diseases to balloons used to treat the common occurrence of benign prostatic hyperplasia (BPH) in aging men. Because payment for these technologies can represent a serious financial drain on third-party payers, utilization has to be carefully evaluated, monitored, and controlled.  相似文献   
72.
The term "investigational" has become the fulcrum upon which coverage decisions turn. All third-party payers, including the federal government, use varying definitions of the term for the purpose of excluding treatments from coverage for payment. Unfortunately, no consistent definition of the term is available to payers to guide them in their coverage decisions.  相似文献   
73.
Coverage decisions by third-party payers are relying more and more heavily on the conclusions of technology assessment programs about the safety and effectiveness of technologies applied in specific clinical situations. Assessment programs vary markedly in the sophistication and rigor of their methodology. Payers differ as to how such assessment information is integrated into their decision-making processes. Finally, coverage decisions about a specific technology can vary widely across the country.  相似文献   
74.
Assaultive behavior. Does provocation begin in the front office?   总被引:3,自引:0,他引:3  
1. Provocation is an important risk predictor because these issues can be recognized, assessed, and appropriate interventions can be implemented to reduce the associated risks. It is only by the reduction of such "non-fixed" risk factors that any reduction of assaults can be accomplished. 2. Involuntary admission, patients with dementia or organic brain disorder, physical or verbal limits, staff attitude, denial of the possibility of assaults, and the educational level and clinical experience of the staff may help provoke an assaultive episode. 3. An important step is assessing the assault to identify provocation due to certain medical causes, and to document the extent of degeneration in patients with dementia or organic brain disorder. Medical intervention would be indicated and would appropriately address the causes of some violent episodes.  相似文献   
75.
"The aim of this paper is to examine the effects of the work permit today [in the United Kingdom], using official data. It first reviews the operation of the [labor migration] system and describes the main schemes incorporated. Then, it uses data for 1984-88 to describe the general characteristics of labor immigration through the schemes. Finally, by means of a small random sample of applications and issues, it presents details on particular aspects of the immigration. It demonstrates that current labour immigration through the system is selective: most of those entering with long-term permits are highly skilled, well paid, and moving within the internal labor markets of large transnational corporations." (SUMMARY IN FRE AND SPA)  相似文献   
76.
77.
78.
Using the 1980 and 1990 Public Use Microdata Samples, we find that labor market outcomes associated with English proficiency vary with respect to gender. For example, a synthetic cohort analysis provides evidence of gender-related differences in Hispanic workers' English skill acquisition. Moreover, we observe that Hispanic women face a lower English deficiency earnings penalty that rises more sharply with education than the penalty obtained by their otherwise similar male peers. Finally, English fluency appears to serve as a stronger occupational sorting mechanism for women than men. ( JEL J3, J1)  相似文献   
79.
The Chittagong Healthy City Project was carried out in late 1994 in Chittagong, Bangladesh. This paper presents findings of an evaluation of the project based upon internationally generated process indicators related to the institutional aspects of the project. The following issues are discussed with regard to project implementation: the institutional organization of local authorities, institutions' conceptual understanding of the project, formal insertion of the project into public authorities' activities, institutional leadership of the project, central-local relations, the lack of interministerial coordination, the project's office, international projects, and community organization. Giving consideration to these issues may help program planners detect problems in forthcoming projects prior to their implementation.  相似文献   
80.
SupposeL(X) is the law of a positive random variableX, andZ is positive and independent ofX. Admissible solution pairs (L(X),L(Z)) are sought for the in-law equation $\hat X \cong X o Z$ °Z, where $L\left( {\hat X} \right)$ is a weighted law constructed fromL(X), and ° is a binary operation which in some sense is increasing. The class of weights includes length biasing of arbitrary order. When ° is addition and the weighting is ordinary length biasing, the class of admissibleL(X) comprises the positive infinitely divisible laws. Examples are given subsuming all known specific cases. Some extensions for general order of length-biasing are discussed.  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