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   12299篇
  免费   332篇
管理学   1794篇
民族学   67篇
人才学   1篇
人口学   1316篇
丛书文集   67篇
教育普及   1篇
理论方法论   1112篇
现状及发展   1篇
综合类   172篇
社会学   5810篇
统计学   2290篇
  2023年   97篇
  2021年   76篇
  2020年   199篇
  2019年   284篇
  2018年   312篇
  2017年   407篇
  2016年   357篇
  2015年   226篇
  2014年   301篇
  2013年   2069篇
  2012年   442篇
  2011年   367篇
  2010年   290篇
  2009年   286篇
  2008年   310篇
  2007年   312篇
  2006年   261篇
  2005年   287篇
  2004年   271篇
  2003年   242篇
  2002年   271篇
  2001年   308篇
  2000年   297篇
  1999年   281篇
  1998年   198篇
  1997年   182篇
  1996年   173篇
  1995年   174篇
  1994年   141篇
  1993年   157篇
  1992年   172篇
  1991年   152篇
  1990年   162篇
  1989年   186篇
  1988年   154篇
  1987年   141篇
  1986年   156篇
  1985年   174篇
  1984年   170篇
  1983年   160篇
  1982年   123篇
  1981年   108篇
  1980年   104篇
  1979年   142篇
  1978年   88篇
  1977年   89篇
  1976年   89篇
  1975年   83篇
  1974年   82篇
  1973年   73篇
排序方式: 共有10000条查询结果,搜索用时 359 毫秒
991.
Environmental uncertainty provides the context for public relations practices. Arguably, environmental uncertainty leads to greater organizational responsiveness to those environments through strategic planning. This survey of 505 American Public Relations Society of America members indicated, however, that perceived environmental conditions were less important to management decision-making than how those conditions were translated or packaged as decision-making inputs through formal environmental scanning mechanisms. Environmental uncertainty had no impact on decision making, once the mediating influence of formal scanning was controlled.  相似文献   
992.
993.
The economically optimal sample size in a food safety test balances the marginal costs and marginal benefits of increasing the sample size. We provide a method for selecting the sample size when testing beef trim for Escherichia coli O157:H7 that equates the averted costs of recalls and health damages from contaminated meats sold to consumers with the increased costs of testing while allowing for uncertainty about the underlying prevalence rates of contamination. Using simulations, we show that, in most cases, the optimal sample size is larger than the current sample size of 60 and, in some cases, it exceeds 120. Moreover, lots with a lower prevalence rate have a higher expected damage because contamination is more difficult to detect. Our simulations indicate that these lots have a higher optimal sampling rate.  相似文献   
994.
Since the introduction and definition of relationship algebras by James (1957), rolatively little use has been made of this theory in experimental design and analysis problems This may be due to the underlying theory of relationship algebras being previously accessible only in books on mathematical structure theory, e.g. van der Waerden (1950) This paper provides a development of the theory of relationship algebras beginning at an elementray level and including only those parts of mathematical structure theory which are essential to this development. An example of its application in derving an analysis due to alling (1967) is presented.  相似文献   
995.
This paper examines the problem of decisions about the disposal of sewage sludge, in the face of stakeholder groups with varying viewpoints, based on a current case from the state of Lower Saxony in Germany. Like other developed countries, Germany faces the dilemma that sludge arisings are increasing (e.g., because of better water treatment) while disposal options are becoming more scarce. Lower Saxony relies heavily on landfill and agricultural application, but landfill of untreated sludge will be banned after 2005. The state Environment Ministry sees agricultural application as having various advantages, but it faces scepticism from various stakeholders. The ministry has therefore taken steps to encourage a long-term dialogue process with the main stakeholders, including farming organizations, food processors, other landowners such as the churches, and environmental and consumer organizations. The process began with a discussion forum in 1995 that led to the proposal of specific discussions with stakeholders. This paper focuses in particular on the dialogue with environmental and consumer groups. It analyzes the initial positions of the various stakeholders, describes the concrete steps taken so far, describes the ongoing efforts, and critically evaluates the procedures used as well as their implications in terms of the ideas of deliberation and analysis.  相似文献   
996.
997.
Human-dominated ecosystems such as in South Florida's Everglades region are greatly affected by societal actions and choices, and efforts to restore degraded ecosystems must take into account the societal drivers of ecosystem change. A conceptual model of societal-ecological interactions within the region illustrates connections between major societal drivers, such as water management and land use, and ecological stressors, such as loss of habitat and nutrient loading. Using the conceptual model as an initial guide for discussion, examination of a restoration scenario for the region shows that social and economic effects from activities proposed in a restoration scenario will likely affect most sectors of South Florida. Political effects from changing land and water management practices likely will be significant, as will the physical effects of changing water structures and management practices. Conceptual models such as this can aid in the initial stages of ecosystem restoration discussions and can assist in planning for subsequent social science evaluations of specific societal impacts of actual proposed governmental restoration alternatives. In crafting restoration scenarios, local, regional, and national decision makers can use conceptual models such as this to help broaden the early considerations of how possible future changes in societal drivers, including management choices, will change ecological stressors that affect ecosystem health.  相似文献   
998.
This paper considers the situation where a stochastic process may display both long-range dependence (LRD) and intermittency. The existence of such a process is established in Anh et al. (1999). Existing works have commonly paid attention either to LRD or intermittency quite separately. This paper offers a convenient framework to study both effects simultaneously. A method is given to estimate and separate the two effects. The wavelet theory plays an essential role in this procedure. Numerical experiments on fractional Brownian motion and multiplicative cascade processes confirm the power of the method.  相似文献   
999.
1000.
One hundred ninety-two children in foster care participated in a randomized efficacy trial of a school readiness intervention, the Kids In Transition to School (KITS) Program, designed to increase literacy, social, and self-regulation skills in children before kindergarten entry. One hundred two children were randomly assigned to the KITS intervention and 90 were randomly assigned to the foster care services as usual comparison group. At the end of the kindergarten year, teachers were asked to report on the children's oppositional and aggressive behaviors in the classroom. Controlling for gender, baseline levels of parent-reported oppositional and aggressive behaviors, and level of disruptiveness in the classroom, children who had received the intervention had significantly lower levels of oppositional and aggressive behaviors in the classroom. Findings suggest that an intervention designed to increase school readiness in children in foster care can have positive effects on kindergarten classroom behavior.  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