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   19969篇
  免费   371篇
  国内免费   1篇
管理学   2903篇
民族学   75篇
人才学   2篇
人口学   1913篇
丛书文集   79篇
教育普及   2篇
理论方法论   1805篇
现状及发展   1篇
综合类   265篇
社会学   9715篇
统计学   3581篇
  2021年   120篇
  2020年   287篇
  2019年   402篇
  2018年   462篇
  2017年   631篇
  2016年   506篇
  2015年   378篇
  2014年   478篇
  2013年   3111篇
  2012年   662篇
  2011年   632篇
  2010年   466篇
  2009年   398篇
  2008年   469篇
  2007年   471篇
  2006年   464篇
  2005年   468篇
  2004年   422篇
  2003年   390篇
  2002年   442篇
  2001年   533篇
  2000年   541篇
  1999年   484篇
  1998年   355篇
  1997年   322篇
  1996年   335篇
  1995年   315篇
  1994年   292篇
  1993年   300篇
  1992年   352篇
  1991年   325篇
  1990年   290篇
  1989年   296篇
  1988年   294篇
  1987年   252篇
  1986年   245篇
  1985年   282篇
  1984年   269篇
  1983年   252篇
  1982年   218篇
  1981年   183篇
  1980年   164篇
  1979年   194篇
  1978年   176篇
  1977年   159篇
  1976年   137篇
  1975年   157篇
  1974年   119篇
  1973年   115篇
  1972年   93篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
Terrorist actions are aimed at maximizing harm (health, psychological, economical, and political) through the combined physical impacts of the act and fear. Immediate and effective response to a terrorist act is critical to limit human and environmental harm, effectively restore facility function, and maintain public confidence. Though there have been terrorist attacks in public facilities that we have learned from, overall our experiences in restoration of public facilities following a terrorist attack are limited. Restoration of public facilities following a release of a hazardous material is inherently far more complex than in industrial settings and has many unique technical, economic, social, and political challenges. For example, there may be a great need to quickly restore the facility to full operation and allow public access even though it was not designed for easy or rapid restoration, and critical information is needed for quantitative risk assessment and effective restoration must be anticipated to be incomplete and uncertain. Whereas present planning documents have substantial linearity in their organization, the “adaptive management” paradigm provides a constructive parallel paradigm for restoration of public facilities that anticipates and plans for uncertainty, inefficiencies, and stakeholder participation. Adaptive management grew out of the need to manage and restore natural resources in highly complex and changing environments with limited knowledge about causal relationships and responses to restoration actions. Similarities between natural resource management and restoration of a public facility after a terrorist attack suggest that integration of adaptive management principles explicitly into restoration processes will result in substantially enhanced and flexible responses necessary to meet the uncertainties of potential terrorist attacks.  相似文献   
93.
To reduce nonresponse bias in sample surveys, a method of nonresponse weighting adjustment is often used which consists of multiplying the sampling weight of the respondent by the inverse of the estimated response probability. The authors examine the asymptotic properties of this estimator. They prove that it is generally more efficient than an estimator which uses the true response probability, provided that the parameters which govern this probability are estimated by maximum likelihood. The authors discuss variance estimation methods that account for the effect of using the estimated response probability; they compare their performances in a small simulation study. They also discuss extensions to the regression estimator.  相似文献   
94.
95.
96.
Few researchers have examined organizational variation in the adoption of workplace drug testing, but innovation theory suggests that adoption is more likely when it is compatible with an organization's values, previously introduced ideas, and needs. Using data from the 1997 National Employee Survey, this research models the effects of organizational compatibility, industry, and establishment size on the adoption of drug testing. The data reveal that compatibility, as measured by an organization's rules orientation, presence of an employee assistance program, and mechanization, is associated with the adoption of drug testing. As predicted, the adoption of drug testing varies across industries and by establishment size.  相似文献   
97.
98.
99.
100.
Over the first years of life, infants gradually develop the ability to retrieve their memories across cue and contextual changes. Whereas maturational factors drive some of these developments in memory ability, experiences occurring within the learning event may also impact infants' ability to retrieve memories in new situations. In 2 experiments we examined whether it was possible to facilitate 12‐month‐old infants' generalization of learning in the deferred imitation paradigm by varying experiences before or during the demonstration session, or during the retention interval. In Experiment 1, altering the length, timing, or variability of training had no impact on generalization; infants showed a low, but consistent level of memory retrieval. In Experiment 2, infants who experienced a unique context for encoding and retrieval exhibited generalization; infants who experienced the context prior to the demonstration session, or during the retention interval, did not. Specificity is a robust feature of infant memory and is not substantially altered by encoding experiences in an observational learning paradigm. Previous history with a learning environment can, however, impact the flexibility of memory retrieval.  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