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   26216篇
  免费   458篇
  国内免费   2篇
管理学   3691篇
民族学   98篇
人才学   1篇
人口学   2451篇
丛书文集   107篇
教育普及   2篇
理论方法论   2325篇
现状及发展   1篇
综合类   366篇
社会学   12431篇
统计学   5203篇
  2021年   139篇
  2020年   372篇
  2019年   516篇
  2018年   580篇
  2017年   823篇
  2016年   620篇
  2015年   482篇
  2014年   612篇
  2013年   4294篇
  2012年   833篇
  2011年   784篇
  2010年   606篇
  2009年   513篇
  2008年   638篇
  2007年   648篇
  2006年   619篇
  2005年   573篇
  2004年   512篇
  2003年   486篇
  2002年   540篇
  2001年   664篇
  2000年   660篇
  1999年   575篇
  1998年   445篇
  1997年   412篇
  1996年   432篇
  1995年   398篇
  1994年   356篇
  1993年   397篇
  1992年   455篇
  1991年   421篇
  1990年   396篇
  1989年   374篇
  1988年   378篇
  1987年   347篇
  1986年   321篇
  1985年   352篇
  1984年   366篇
  1983年   337篇
  1982年   296篇
  1981年   238篇
  1980年   248篇
  1979年   285篇
  1978年   243篇
  1977年   229篇
  1976年   194篇
  1975年   230篇
  1974年   179篇
  1973年   162篇
  1972年   140篇
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
341.
This paper develops a model ofinter vivos gifts and bequests in a setting of moral hazard and adverse selection. Altruistic parents do not perfectly know how much effort their children make to earn their living, nor do they know their true level of ability.Inter vivos gifts take place prior to the realization of the children's earnings whereas at the moment of bequests, parents do observe them. We show that an optimal transfer policy generally uses a mix ofinter vivos gifts — deemed as more efficient — and bequests — deemed as more redistributive.We are thankful to Allessandro Cigno, Jacques Cremer, Claude d Aspremont and anonymous referees for their comments.Responsible editor: Alessandro Cigno  相似文献   
342.
343.
Experiments involving large social units, such as schools, work sites, or whole cities, are commonly limited in statistical power because the number of randomized units is small, leaving few degrees of freedom for residual (between-unit) error. The authors describe a method for increasing residual degrees of freedom in a community experiment without substantially increasing cost or difficulty. In brief, they propose that the experimental units should be divided into random subsamples (batches). Batch sampling can improve statistical power if the community endpoint means are stable over time or if their temporal variation is comparable in period to the batch-sampling schedule. The authors demonstrate the theoretical advantages of the batch system and illustrate its use with data from the Pawtucket Heart Health Program, in which such a design was implemented.  相似文献   
344.
This study examines the impact of mandatory seat belt laws on fatal and incapacitating injury rates in the states. Annual data for all 50 states for the period 1975-1991 are used. Pooled time series analysis is employed. The general conclusion that emerges from this analysis is that seat belt laws significantly impact state fatal injury rates. Primary enforcement and all-seat coverage provisions appear to be particularly effective in reducing fatality rates.  相似文献   
345.
Sensitive research issues call for anonymous questionnaires. This makes accurately matching pretests with posttests difficult or impossible. Various subject-generated coding schemes have been developed, but their accuracy has been unknown. This anonymous study, with 745 students, used subject-generated coding to match pretests with posttests. The matching was verified for accuracy with the use of a collateral, anonymous, sticker identification system. The coding system was able to accurately match 75.2% of all the pretest-posttest pairs. An additional 22.1% of the pairs were left unmatched and only 2.7% were matched incorrectly. Subject-generated coding systems can be very effective where confidentiality is important to protect.  相似文献   
346.
The projected increase of people in Japan aged 75 years and older in the years to come implies the increase of the disabled elderly. Thus, the core of societal preparation for the aging of the population is generally considered to be the expansion of services for the disabled elderly. However, gerontological studies on the health status of the elderly conducted in Japan show that the prevalence of disability is quite low and even decreasing. Relative to the services for the disabled elderly, preventive services for the healthy elderly have long been overlooked. In 1994, the Metropolitan Tokyo Government organized a task force to develop a new health education program as the preventive health service for the healthy urban elderly. A preliminary plan outlining the health education program--consisting of propagation with a booklet, on-the-job training of practitioners, and development of new curricula and teaching materials--was proposed by the authors for discussion within the task force. Although the inquiry has just begun and the plan is still nascent, it seems adequate to fit the needs for preventive health services in the near future.  相似文献   
347.
348.
The way the nation provides for the financing and delivery of long-term care is badly in need of reform. The principal options for change are private insurance, altering Medicaid, and public long-term care insurance. This article uses the Brookings-ICF Long-Term Care Financing Model to evaluate each of these options in terms of affordability, distribution of benefits, and ability to reduce catastrophic out-of-pocket costs. So long as private insurance is aimed at the elderly, its market penetration and ability to finance long-term care will remain severely limited. Affordability is a major problem. Selling to younger persons could solve the affordability problem, but marketing is extremely difficult. Liberalizing Medicaid could help solve the problems of long-term care, but there is little public support for means-tested programs. Finally, universalistic public insurance programs do well in meeting the goals of long-term care reform, but all social insurance programs are expensive and seem politically infeasible in the current political environment.  相似文献   
349.
Presented here are some resources--books, consultants, and personal growth practices--that you might find useful in the struggle to become adept at dealing with change. Mastering change is a long process, but unlike building a cathedral or growing apples, as soon as you start you will have something that you can use--some insight, a different way of looking at what is confronting you, something to help jar you to a more creative strategy.  相似文献   
350.
How do you embrace paradox, changing and growing without losing your sense of who you are? We talked last time about the paradox of reaching for the new, without losing your ground in the old. Paradox is the place of insight. Accepting paradox, not as a momentary distraction but as a place to live, lies at the heart of dealing successfully with change. We can see this most clearly if we ask ourselves, "What business am I in? What am I about?" In health care, this did not used to be a meaningful question. Today, it is a critical one. But to really develop, we have to seek out the situations that are the most difficult for us, work them through, hang out with them long enough to begin to be at home in the paradoxical, ambiguous, and strange circumstance.  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