全文获取类型
收费全文 | 2470篇 |
免费 | 112篇 |
专业分类
管理学 | 363篇 |
民族学 | 14篇 |
人才学 | 1篇 |
人口学 | 171篇 |
丛书文集 | 14篇 |
理论方法论 | 303篇 |
综合类 | 10篇 |
社会学 | 1425篇 |
统计学 | 281篇 |
出版年
2023年 | 19篇 |
2022年 | 9篇 |
2021年 | 21篇 |
2020年 | 41篇 |
2019年 | 71篇 |
2018年 | 76篇 |
2017年 | 100篇 |
2016年 | 88篇 |
2015年 | 62篇 |
2014年 | 96篇 |
2013年 | 404篇 |
2012年 | 82篇 |
2011年 | 80篇 |
2010年 | 91篇 |
2009年 | 77篇 |
2008年 | 93篇 |
2007年 | 93篇 |
2006年 | 90篇 |
2005年 | 72篇 |
2004年 | 79篇 |
2003年 | 76篇 |
2002年 | 72篇 |
2001年 | 64篇 |
2000年 | 48篇 |
1999年 | 53篇 |
1998年 | 50篇 |
1997年 | 49篇 |
1996年 | 33篇 |
1995年 | 43篇 |
1994年 | 32篇 |
1993年 | 33篇 |
1992年 | 26篇 |
1991年 | 37篇 |
1990年 | 25篇 |
1989年 | 14篇 |
1988年 | 16篇 |
1987年 | 13篇 |
1986年 | 11篇 |
1985年 | 18篇 |
1984年 | 23篇 |
1983年 | 18篇 |
1982年 | 18篇 |
1981年 | 8篇 |
1980年 | 8篇 |
1979年 | 10篇 |
1978年 | 6篇 |
1977年 | 8篇 |
1976年 | 8篇 |
1975年 | 7篇 |
1974年 | 4篇 |
排序方式: 共有2582条查询结果,搜索用时 15 毫秒
171.
Mark Gibbs 《Risk analysis》2011,31(11):1784-1788
Ecological risk assessment embodied in an adaptive management framework is becoming the global standard approach for formally assessing and managing the ecological risks of technology and development. Ensuring the continual improvement of ecological risk assessment approaches is partly achieved through the dissemination of not only the types of risk assessment approaches used, but also their efficacy. While there is an increasing body of literature describing the results of general comparisons between alternate risk assessment methods and models, there is a paucity of literature that post hoc assesses the performance of specific predictions based on an assessment of risk and the effectiveness of the particular model used to predict the risk. This is especially the case where risk assessments have been used to grant consent or approval for the construction of major infrastructure projects. While postconstruction environmental monitoring is increasingly commonplace, it is not common for a postconstruction assessment of the accuracy and performance of the ecological risk assessment and underpinning model to be undertaken. Without this “assessment of the assessment,” it is difficult for other practitioners to gain insight into the performance of the approach and models used and therefore, as argued here, this limits the rate of improvement of risk assessment approaches. 相似文献
172.
This article is devoted to the construction and asymptotic study of adaptive, group‐sequential, covariate‐adjusted randomized clinical trials analysed through the prism of the semiparametric methodology of targeted maximum likelihood estimation. We show how to build, as the data accrue group‐sequentially, a sampling design that targets a user‐supplied optimal covariate‐adjusted design. We also show how to carry out sound statistical inference based on such an adaptive sampling scheme (therefore extending some results known in the independent and identically distributed setting only so far), and how group‐sequential testing applies on top of it. The procedure is robust (i.e. consistent even if the working model is mis‐specified). A simulation study confirms the theoretical results and validates the conjecture that the procedure may also be efficient. 相似文献
173.
Daniel Boduszek Gary Adamson Mark Shevlin Philip Hyland Ashling Bourke 《Journal Of Human Behavior In The Social Environment》2013,23(1):14-28
Previous research suggests a direct relationship between criminal friends and criminal thinking style; however, social identity theory proposes that identity mediates the impact of social group members on development of thinking styles. This research project is the first attempt to empirically test the mediating role of criminal social identity in the development of criminal thinking styles within a recidivistic prison sample (N = 312). The structural equation model of criminal thinking style presented and tested in this study supports the central predictions of social identity theory, with findings demonstrating an indirect effect of antisocial friend associations on criminal thinking through in-group affect and in-group ties with criminal in-group members that reflect two of three dimensions of the measure of criminal social identity applied in the current study. Further implications in relation to theory and previous studies are discussed. 相似文献
174.
175.
AbstractTo increase the effectiveness and efficiency of searches for information, accounting students, researchers, practitioners, and regulators could benefit from a Website devoted to the electronic access to journals. The site described here addresses such a need in the business discipline of accounting. On the site, the titles of over 470 journals are listed and categorized by topical areas within accounting. Then, within each accounting category, the journals are grouped according to their Internet accessibility. To provide the user with quick access to the various journals, the site provides links to the homepages of the various journals. Serials Review 2002; 28:201–205. 相似文献
176.
Mark Needleman 《Serials Review》2013,39(3):202-203
AbstractThis article describes the concepts of Web 2.0 and Lib 2.0 and how they can be applied to libraries and in a library environment. 相似文献
177.
Mark Needleman 《Serials Review》2013,39(1)
AbstractRecognizing the importance of the institution as a critical entity in any information model, from information creation to information sharing, NISO (National Information Standards Organization) has formed a working group to develop a standard (Z39.94) for identifying institutions. This installment of “Standards Update” will discuss the mission and objectives of that working group and provide some information about its timelines for developing the standard. 相似文献
178.
Mark Needleman 《Serials Review》2013,39(3):193-194
AbstractThis article describes the CORE (Cost of Resource Exchange) standard. CORE defines an XML schema to allow the exchange of financial information relating to library resources among library systems. 相似文献
179.
We investigate the interplay of smoothness and monotonicity assumptions when estimating a density from a sample of observations. The nonparametric maximum likelihood estimator of a decreasing density on the positive half line attains a rate of convergence of [Formula: See Text] at a fixed point t if the density has a negative derivative at t. The same rate is obtained by a kernel estimator of bandwidth [Formula: See Text], but the limit distributions are different. If the density is both differentiable at t and known to be monotone, then a third estimator is obtained by isotonization of a kernel estimator. We show that this again attains the rate of convergence [Formula: See Text], and compare the limit distributions of the three types of estimators. It is shown that both isotonization and smoothing lead to a more concentrated limit distribution and we study the dependence on the proportionality constant in the bandwidth. We also show that isotonization does not change the limit behaviour of a kernel estimator with a bandwidth larger than [Formula: See Text], in the case that the density is known to have more than one derivative. 相似文献
180.