全文获取类型
收费全文 | 3640篇 |
免费 | 120篇 |
国内免费 | 33篇 |
专业分类
管理学 | 77篇 |
民族学 | 18篇 |
人口学 | 15篇 |
丛书文集 | 417篇 |
理论方法论 | 120篇 |
综合类 | 2861篇 |
社会学 | 68篇 |
统计学 | 217篇 |
出版年
2024年 | 8篇 |
2023年 | 12篇 |
2022年 | 25篇 |
2021年 | 39篇 |
2020年 | 32篇 |
2019年 | 41篇 |
2018年 | 56篇 |
2017年 | 65篇 |
2016年 | 59篇 |
2015年 | 92篇 |
2014年 | 171篇 |
2013年 | 200篇 |
2012年 | 176篇 |
2011年 | 246篇 |
2010年 | 166篇 |
2009年 | 193篇 |
2008年 | 212篇 |
2007年 | 304篇 |
2006年 | 290篇 |
2005年 | 278篇 |
2004年 | 277篇 |
2003年 | 219篇 |
2002年 | 224篇 |
2001年 | 147篇 |
2000年 | 98篇 |
1999年 | 33篇 |
1998年 | 14篇 |
1997年 | 26篇 |
1996年 | 28篇 |
1995年 | 11篇 |
1994年 | 11篇 |
1993年 | 11篇 |
1992年 | 10篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有3793条查询结果,搜索用时 62 毫秒
101.
产权保护为企业创新效率提供了制度基础.相比已有静态性的分析视角,通过《物权法》改革这条主线,在动态性视角下考察产权保护水平对企业创新行为的影响.研究发现,《物权法》实施后,随着产权保护水平的提高,企业的创新活动显著增强,企业的专利数量和质量均显著增加.《物权法》对企业创新行为的促进作用在低市场化进程地区、无政治关联企业以及非国有企业中更为显著.在"法与金融"的研究框架内,从产权保护水平的动态性视角,为企业创新行为提供了合理的解释.物权法的实施进一步发挥了市场在资源优化配置的基础性作用,规范市场经济的民法体系,同时,保护了债权人的利益,促进了外部融资的增长,优化了资源配置效率.研究结论有助于我们正确认识和理解《物权法》实施的政策效果.同时,对于产权保护水平如何影响企业财务行为决策具有重要的政策启示. 相似文献
102.
This study, based on a survey of 489 documentary filmmakers, is a case study in copyright policy in and through practice. It assesses the changes in documentary production practice around clearance of copyrighted material since the creation of the Documentary Filmmakers' Statement of Best Practices in fair use in 2005. Fair use, an exotic and occasional feature of documentary film in 2004, has become well known and commonly employed. Creative options for filmmakers concerning the use of third-party material have dramatically improved with changes in norms after the issuing of the Statement. Attitudes about fair use are strongly associated with free expression and creative opportunity, and vary with experience. Where filmmakers have changed work because of copyright concerns, they themselves rather than any gatekeeper have made the decision to do so. Where change is associated with fair use, risk is a common concern. Newer filmmakers are more likely to support the use of copyrighted material to make new work, but less likely to know about fair use, and also more likely to have experienced takedowns online. Both education about and experience with fair use appear to have an effect on practice. Filmmakers continue to lack reliable information on the actual risk landscape, and about fair use on digital platforms. 相似文献
103.
文章基于政府主导视角,利用2006—2015年我国30个省级面板数据,构建多元回归模型,分析变量之间的关系.其结果显示,环境管制、知识产权保护与区域创新能力之间呈非线性关系,环境管制与知识产权保护同时实施对区域创新能力有显著的促进作用,且具有区域异质性.从企业生存角度出发,提出门槛效应假说,采用Hansen面板门槛回归模型进行检验.结果表明,在环境管制与知识产权保护共同发挥作用时,环境管制必须控制在合理的范围内.最后采用门槛效应回归方法找到了环境管制与知识产权保护对区域创新能力影响的门槛值,并提出相应的政策建议. 相似文献
104.
任凤辉 《长春工程学院学报(社会科学版)》2014,(2):33-35
立足于吉林省廉租房政策实施效果的全面调查数据,概述了吉林省廉租房政策实施效果,以独特的视角深入分析了廉租房政策推行过程中出现的一些亟需解决的共性问题,提出了针对性的解决对策。 相似文献
105.
转租是有别于租约让与和普通租赁的特殊租赁形式。在转租方面,世界各国立法大致可分为自由主义、限制主义和区别主义三种模式。我国《合同法》第224条关于转租的规定采限制主义,这虽然减轻了司法任务,促成了判决统一,但因不区分转租与租约转让且不分租赁之具体情形一概加以限制未免显得过于笼统,且该规定本身有违公平原则。在当前政治经济背景下,平衡当事人之利益显得尤为重要。借鉴自由主义的立法模式对现有制度予以修正,并对民事和商事租赁进行区别,对动产和不动产租赁采取不同规则具有重要意义。 相似文献
106.
《Journal of Statistical Computation and Simulation》2012,82(10):1235-1244
In this paper, we consider simultaneous confidence intervals for all-pairwise comparisons of treatment means in a one-way layout under heteroscedasticity. Two kinds of simultaneous intervals are provided based on the fiducial generalized pivotal quantities of the interest parameters. We prove that they both have asymptotically correct coverage. Simulation results and an example are also reported. It is concluded from calculational evidence that the second kind of simultaneous confidence intervals, which we provide, performs better than existing methods. 相似文献
107.
Qiang Sun Bai Jiang Hongtu Zhu Joseph G. Ibrahim 《Scandinavian Journal of Statistics》2019,46(1):314-328
In this paper, we propose the hard thresholding regression (HTR) for estimating high‐dimensional sparse linear regression models. HTR uses a two‐stage convex algorithm to approximate the ?0‐penalized regression: The first stage calculates a coarse initial estimator, and the second stage identifies the oracle estimator by borrowing information from the first one. Theoretically, the HTR estimator achieves the strong oracle property over a wide range of regularization parameters. Numerical examples and a real data example lend further support to our proposed methodology. 相似文献
108.
The high-dimensional data arises in diverse fields of sciences, engineering and humanities. Variable selection plays an important role in dealing with high dimensional statistical modelling. In this article, we study the variable selection of quadratic approximation via the smoothly clipped absolute deviation (SCAD) penalty with a diverging number of parameters. We provide a unified method to select variables and estimate parameters for various of high dimensional models. Under appropriate conditions and with a proper regularization parameter, we show that the estimator has consistency and sparsity, and the estimators of nonzero coefficients enjoy the asymptotic normality as they would have if the zero coefficients were known in advance. In addition, under some mild conditions, we can obtain the global solution of the penalized objective function with the SCAD penalty. Numerical studies and a real data analysis are carried out to confirm the performance of the proposed method. 相似文献
109.
Ngoc Khue Tran 《统计学通讯:理论与方法》2017,46(16):7942-7968
In this article, we consider an ergodic Ornstein–Uhlenbeck process with jumps driven by a Brownian motion and a compensated Poisson process, whose drift and diffusion coefficients as well as its jump intensity depend on unknown parameters. Considering the process discretely observed at high frequency, we derive the local asymptotic normality property. To obtain this result, Malliavin calculus and Girsanov’s theorem are applied to write the log-likelihood ratio in terms of sums of conditional expectations, for which a central limit theorem for triangular arrays can be applied. 相似文献
110.
In this article, we present a new efficient iteration estimation approach based on local modal regression for single-index varying-coefficient models. The resulted estimators are shown to be robust with regardless of outliers and error distributions. The asymptotic properties of the estimators are established under some regularity conditions and a practical modified EM algorithm is proposed for the new method. Moreover, to achieve sparse estimator when there exists irrelevant variables in the index parameters, a variable selection procedure based on SCAD penalty is developed to select significant parametric covariates and the well-known oracle properties are also derived. Finally, some numerical examples with various distributed errors and a real data analysis are conducted to illustrate the validity and feasibility of our proposed method. 相似文献