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   32402篇
  免费   474篇
  国内免费   78篇
管理学   4218篇
劳动科学   7篇
民族学   258篇
人才学   5篇
人口学   4080篇
丛书文集   1072篇
教育普及   1篇
理论方法论   2328篇
现状及发展   1篇
综合类   3985篇
社会学   12485篇
统计学   4514篇
  2023年   120篇
  2022年   150篇
  2021年   191篇
  2020年   322篇
  2019年   411篇
  2018年   2042篇
  2017年   2203篇
  2016年   1543篇
  2015年   478篇
  2014年   665篇
  2013年   3221篇
  2012年   1174篇
  2011年   1942篇
  2010年   1825篇
  2009年   1573篇
  2008年   1584篇
  2007年   1793篇
  2006年   844篇
  2005年   1037篇
  2004年   915篇
  2003年   773篇
  2002年   715篇
  2001年   604篇
  2000年   526篇
  1999年   439篇
  1998年   327篇
  1997年   305篇
  1996年   312篇
  1995年   286篇
  1994年   248篇
  1993年   270篇
  1992年   260篇
  1991年   237篇
  1990年   221篇
  1989年   246篇
  1988年   227篇
  1987年   192篇
  1986年   200篇
  1985年   229篇
  1984年   222篇
  1983年   209篇
  1982年   180篇
  1981年   155篇
  1980年   151篇
  1979年   179篇
  1978年   129篇
  1977年   128篇
  1976年   129篇
  1975年   122篇
  1974年   108篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
文化生产力的崛起与发展   总被引:1,自引:0,他引:1  
马克思提出的文化生产力概念包含着正确把握现代社会智能生产力的指导性原则。文化生产力的提出, 使文化知识从非独立因素变为独立因素,由潜在生产力变为现实生产力。文化生产力的高度发展对现代文明的影响是全方位的,将对旧有的生产生活方式、思维方式、价值观念、教育模式和经营管理及领导决策产生重大影响,从而改变财富的分配方式。改革开放以来,我国文化生产力有了突破性发展,但在总体水平上同发达国家的差距很大。应当强化全民的“文化生产力”意识,建立起国家的技术创新体系和知识创新体系,加大对教育和科技的投入。  相似文献   
82.
本文对中学生物学教学如何进行爱国主义教育相关问题加以论述。  相似文献   
83.
Proportional reversed hazard rate model and its applications   总被引:1,自引:0,他引:1  
The purpose of this paper is to study the structure and properties of the proportional reversed hazard rate model (PRHRM) in contrast to the celebrated proportional hazard model (PHM). The monotonicity of the hazard rate and the reversed hazard rate of the model is investigated. Some criteria of aging are presented and the inheritance of the aging notions (of the base distribution) by the PRHRM is studied. Characterizations of the model involving Fisher information are presented and the statistical inference of the parameters is discussed. Finally, it is shown that several members of the proportional reversed hazard rate class have been found to be useful and flexible in real data analysis.  相似文献   
84.
Point processes are the stochastic models most suitable for describing physical phenomena that appear at irregularly spaced times, such as the earthquakes. These processes are uniquely characterized by their conditional intensity, that is, by the probability that an event will occur in the infinitesimal interval (t, t+Δt), given the history of the process up tot. The seismic phenomenon displays different behaviours on different time and size scales; in particular, the occurrence of destructive shocks over some centuries in a seismogenic region may be explained by the elastic rebound theory. This theory has inspired the so-called stress release models: their conditional intensity translates the idea that an earthquake produces a sudden decrease in the amount of strain accumulated gradually over time along a fault, and the subsequent event occurs when the stress exceeds the strength of the medium. This study has a double objective: the formulation of these models in the Bayesian framework, and the assignment to each event of a mark, that is its magnitude, modelled through a distribution that depends at timet on the stress level accumulated up to that instant. The resulting parameter space is constrained and dependent on the data, complicating Bayesian computation and analysis. We have resorted to Monte Carlo methods to solve these problems.  相似文献   
85.
86.
87.
Summary. The paper develops methods for the design of experiments for mechanistic models when the response must be transformed to achieve symmetry and constant variance. The power transformation that is used is partially justified by a rule in analytical chemistry. Because of the nature of the relationship between the response and the mechanistic model, it is necessary to transform both sides of the model. Expressions are given for the parameter sensitivities in the transformed model and examples are given of optimum designs, not only for single-response models, but also for experiments in which multivariate responses are measured and for experiments in which the model is defined by a set of differential equations which cannot be solved analytically. The extension to designs for checking models is discussed.  相似文献   
88.
89.
Banks winners in tournaments are difficult to recognize   总被引:1,自引:0,他引:1  
Given a tournament T, a Banks winner of T is the top vertex of any maximal (with respect to inclusion) transitive subtournament of T. In this technical note, we show that the problem of deciding whether some fixed vertex v is a Banks winner for T is NP-complete. Received: 22 February 2002/Accepted: 20 June 2002 Supported by the START program Y43-MAT of the Austrian Ministry of Science. I would like to thank two thank the referees for a careful reading of the paper, for helpful remarks, and for many suggestions how to improve the presentation.  相似文献   
90.
The paradigm in disability supports is shifting away from institutional services and professional control towards self-determination and community involvement of people with disabilities. The assumption that the best way to provide disability supports is for government to give money to agencies or services, rather than directly to people with disabilities and their support networks, is being challenged. This article reports on findings and themes from a Canadian study that investigated individualised funding projects from different parts of the world. Ten of fifteen of the most 'promising initiatives' were selected for more detailed study and analysis. Projects analysed were from Canada, the US, and Australia. Themes emerging from the study included the fact that values and principles mattered, a policy framework provided coherence and equity, infrastructure supports for individuals were separate from service system, the facilitator-broker role differed from case management, allocation of individualised funds was designed to be equitable and account able to the funder and person, and a 'learn as you go' philosophy maximised positive outcomes. This research project demonstrates that individualised support and funding, when embedded in the new paradigm of disability and community, builds capacity of individuals, families, and communities.  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