全文获取类型
收费全文 | 2970篇 |
免费 | 105篇 |
国内免费 | 26篇 |
专业分类
管理学 | 156篇 |
劳动科学 | 15篇 |
民族学 | 66篇 |
人口学 | 55篇 |
丛书文集 | 719篇 |
理论方法论 | 171篇 |
综合类 | 1570篇 |
社会学 | 148篇 |
统计学 | 201篇 |
出版年
2024年 | 3篇 |
2023年 | 11篇 |
2022年 | 37篇 |
2021年 | 50篇 |
2020年 | 35篇 |
2019年 | 29篇 |
2018年 | 34篇 |
2017年 | 59篇 |
2016年 | 55篇 |
2015年 | 84篇 |
2014年 | 100篇 |
2013年 | 164篇 |
2012年 | 147篇 |
2011年 | 205篇 |
2010年 | 242篇 |
2009年 | 208篇 |
2008年 | 181篇 |
2007年 | 216篇 |
2006年 | 207篇 |
2005年 | 150篇 |
2004年 | 99篇 |
2003年 | 129篇 |
2002年 | 205篇 |
2001年 | 154篇 |
2000年 | 97篇 |
1999年 | 41篇 |
1998年 | 17篇 |
1997年 | 24篇 |
1996年 | 26篇 |
1995年 | 25篇 |
1994年 | 14篇 |
1993年 | 10篇 |
1992年 | 16篇 |
1991年 | 9篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
排序方式: 共有3101条查询结果,搜索用时 15 毫秒
61.
从体育课程设置、教学内容、教学组织形式、学生体育考核等方面对“三阶段式”体育教学改革进行分析,可以发现,“三阶段式”体育教学具有实效性,符合现阶段学生实际。由此也发现,体育教学方法、手段只有尽可能体现快乐健康教育的特点,才能取得好的教学效果。 相似文献
62.
《幽明录》是一部具有珍贵语料价值的杂传类小说集。笔者在对全书进行了定量、定性的统计分析后,发现其语法构词和语音构词间、语法构词内部的形态构词与句法构词间及其句法构词中表述式、支配式、补充式与联合式、偏正式间有着极大的不平衡性。 相似文献
63.
To perform variable selection in expectile regression, we introduce the elastic-net penalty into expectile regression and propose an elastic-net penalized expectile regression (ER-EN) model. We then adopt the semismooth Newton coordinate descent (SNCD) algorithm to solve the proposed ER-EN model in high-dimensional settings. The advantages of ER-EN model are illustrated via extensive Monte Carlo simulations. The numerical results show that the ER-EN model outperforms the elastic-net penalized least squares regression (LSR-EN), the elastic-net penalized Huber regression (HR-EN), the elastic-net penalized quantile regression (QR-EN) and conventional expectile regression (ER) in terms of variable selection and predictive ability, especially for asymmetric distributions. We also apply the ER-EN model to two real-world applications: relative location of CT slices on the axial axis and metabolism of tacrolimus (Tac) drug. Empirical results also demonstrate the superiority of the ER-EN model. 相似文献
64.
65.
Yueyong Shi Zehui Zhou Yuling Jiao 《Journal of Statistical Computation and Simulation》2019,89(5):864-883
The smooth integration of counting and absolute deviation (SICA) penalty has been demonstrated theoretically and practically to be effective in nonconvex penalization for variable selection and parameter estimation. However, solving the nonconvex optimization problem associated with SICA penalty in high-dimensional setting remains to be enriched, mainly due to the singularity at the origin and the nonconvexity of the SICA penalty function. In this paper, we develop a fast primal dual active set (PDAS) with continuation algorithm for solving the nonconvex SICA-penalized least squares in high dimensions. Upon introducing the dual variable, the PDAS algorithm iteratively identify and update the active set in the optimization using both the primal and dual information, and then solve a low-dimensional least square problem on the active set. When combined with a continuation strategy and a high-dimensional Bayesian information criterion (BIC) selector on the tuning parameters, the proposed algorithm is very efficient and accurate. Extensive simulation studies and analysis of a high-dimensional microarray gene expression data are presented to illustrate the performance of the proposed method. 相似文献
66.
Jorge Quiroz Richard Montes Heliang Shi Satrajit Roychoudhury 《Pharmaceutical statistics》2019,18(3):316-328
Assessment of analytical similarity of tier 1 quality attributes is based on a set of hypotheses that tests the mean difference of reference and test products against a margin adjusted for standard deviation of the reference product. Thus, proper assessment of the biosimilarity hypothesis requires statistical tests that account for the uncertainty associated with the estimations of the mean differences and the standard deviation of the reference product. Recently, a linear reformulation of the biosimilarity hypothesis has been proposed, which facilitates development and implementation of statistical tests. These statistical tests account for the uncertainty in the estimation process of all the unknown parameters. In this paper, we survey methods for constructing confidence intervals for testing the linearized reformulation of the biosimilarity hypothesis and also compare the performance of the methods. We discuss test procedures using confidence intervals to make possible comparison among recently developed methods as well as other previously developed methods that have not been applied for demonstrating analytical similarity. A computer simulation study was conducted to compare the performance of the methods based on the ability to maintain the test size and power, as well as computational complexity. We demonstrate the methods using two example applications. At the end, we make recommendations concerning the use of the methods. 相似文献
67.
68.
政府俘获理论的比较分析——芝加哥学派与弗吉尼亚学派 总被引:1,自引:0,他引:1
石淑华 《福建论坛(人文社会科学版)》2006,83(12):8-11
芝加哥学派和弗吉尼亚学派是公共选择理论的两个重要学派,它们都从经济学角度对规制领域中的政府俘获问题(或利益集团问题)进行了深入研究,提出了规制机构为特殊利益集团服务的观点。但是,二者在理论假设、研究内容、研究方法、竞争影响、租金耗散等问题上观点迥异,从而形成20世纪七八十年代政府俘获理论研究上的不同派别。 相似文献
69.
“场域-惯习”视角下的水电移民长期补偿安置方式 总被引:1,自引:0,他引:1
借鉴布迪厄的场域-惯习理论,从移民安置的场域、资本、惯习及其相互之间的作用出发,构建水电移民安置方式分析框架。应用该分析框架对水电移民长期补偿安置方式实施的原因、存在的风险和可能的变化进行社会学解读。 相似文献
70.
建设新农村要打破小农社会的内在稳定,必须引入新的要素。新制度经济学认为要引入的最重要的要素是制度。但制度的学习引入需要非正式制度发生相应变化,由此新农村建设的关键是改变非正式制度,特别是农民的不利于发展的观念与小农社会的规范与习俗。为此,必须加大对社会文明基础设施投入的转移支付的力度,以促进信息、人口流动,改变农民所处的环境,从而促使农村非正式制度的变化。 相似文献