全文获取类型
收费全文 | 11411篇 |
免费 | 296篇 |
专业分类
管理学 | 1418篇 |
民族学 | 48篇 |
人口学 | 927篇 |
丛书文集 | 62篇 |
教育普及 | 3篇 |
理论方法论 | 1008篇 |
综合类 | 114篇 |
社会学 | 6113篇 |
统计学 | 2014篇 |
出版年
2023年 | 56篇 |
2021年 | 62篇 |
2020年 | 139篇 |
2019年 | 212篇 |
2018年 | 237篇 |
2017年 | 337篇 |
2016年 | 240篇 |
2015年 | 185篇 |
2014年 | 256篇 |
2013年 | 2336篇 |
2012年 | 301篇 |
2011年 | 304篇 |
2010年 | 223篇 |
2009年 | 204篇 |
2008年 | 225篇 |
2007年 | 222篇 |
2006年 | 248篇 |
2005年 | 221篇 |
2004年 | 184篇 |
2003年 | 165篇 |
2002年 | 186篇 |
2001年 | 273篇 |
2000年 | 256篇 |
1999年 | 270篇 |
1998年 | 170篇 |
1997年 | 152篇 |
1996年 | 211篇 |
1995年 | 208篇 |
1994年 | 216篇 |
1993年 | 221篇 |
1992年 | 232篇 |
1991年 | 217篇 |
1990年 | 240篇 |
1989年 | 211篇 |
1988年 | 199篇 |
1987年 | 176篇 |
1986年 | 164篇 |
1985年 | 172篇 |
1984年 | 177篇 |
1983年 | 124篇 |
1982年 | 124篇 |
1981年 | 103篇 |
1980年 | 115篇 |
1979年 | 114篇 |
1978年 | 96篇 |
1977年 | 85篇 |
1976年 | 82篇 |
1975年 | 85篇 |
1974年 | 58篇 |
1973年 | 54篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
401.
Studying the right tail of a distribution, one can classify the distributions into three classes based on the extreme value index γ. The class γ>0 corresponds to Pareto-type or heavy tailed distributions, while γ<0 indicates that the underlying distribution has a finite endpoint. The Weibull-type distributions form an important subgroup within the Gumbel class with γ=0. The tail behaviour can then be specified using the Weibull tail index. Classical estimators of this index show severe bias. In this paper we present a new estimation approach based on the mean excess function, which exhibits improved bias and mean squared error. The asserted properties are supported by simulation experiments and asymptotic results. Illustrations with real life data sets are provided. 相似文献
402.
D. James Greiner Kevin M. Quinn 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2009,172(1):67-81
Summary. Despite its potential pitfalls, ecological inference is an unavoidable part of some quantitative settings, including US voting rights litigation. In such applications, the analyst will typically encounter two-way tables with more than two rows and columns. Although several ecological inference methods are currently available for 2×2 tables, there are fewer options for analysing general R × C tables, and virtually none that model counts as opposed to fractions. We propose a count R × C method that respects the bounds deterministically, that allows for complex relationships between internal cell quantities, that is easily extensible and that results from transparent assumptions. We study the method via simulation, and then apply it to an example that is drawn from the state of Texas relevant to recent redistricting litigation there. 相似文献
403.
风险社会背景下大学生的信仰危机 总被引:2,自引:0,他引:2
当今,世界正由工业社会向风险社会过渡,信仰危机是当代人类面临的全球性问题,信仰危机的出现要求我们关注信仰教育。受全球化的影响,中国也处于风险社会之中。大学生作为我国社会主义事业的接班人,其信仰状况直接关系到国家的前途和命运。本文首先阐述了信仰以及信仰危机的含义,然后分析了我国大学生当前存在的信仰危机及其产生的原因,最后对于解决我国大学生的信仰危机提出了几点建议。 相似文献
404.
Mediation and moderation are two theories for refining and understanding a causal relationship. Empirical investigation of
mediators and moderators requires an integrated research design rather than the data analyses driven approach often seen in
the literature. This paper described the conceptual foundation, research design, data analysis, as well as inferences involved
in a mediation and/or moderation investigation in both experimental and non-experimental (i.e., correlational) contexts. The
essential distinctions between the investigation of mediators and moderators were summarized and juxtaposed in an example
of a causal relationship between test difficulty and test anxiety. In addition, the more elaborate models, moderated mediation
and mediated moderation, the use of structural equation models, and the problems with model misspecification were discussed
conceptually.
相似文献
Bruno D. ZumboEmail: |
405.
A single latent variable model of health status and therapeutic health care utilization is estimated for parents and own children
of 6,557 US households. The equation system that identifies latent health status simultaneously determines a number of indicators
of general health, including presence of morbidity symptoms, mobility limitations, medication needs, and utilization of therapeutic
health care services. The main goal of the paper was to obtain an unbiased estimate of parents’ marginal substitution rate
between own and child health. Results indicate that parents’ valuation of their children’s health exceeds their valuation
of own health by almost twofold on average.
相似文献
Thomas D. CrockerEmail: |
406.
This article uses a demographic approach and data from the Health and Retirement Survey, a nationally representative sample of the U.S. population, to investigate sex differences in the length of life lived with heart disease and after a heart attack for persons in the United States age 50 and older. On average, women live longer than men with heart disease. At age 50 women can expect to live 7.9 years and men 6.7 years with heart disease. The average woman experiences heart disease onset three years older and heart attacks 4.4 years older than men. 相似文献
407.
Vertex betweenness centrality is a metric that seeks to quantify a sense of the importance of a vertex in a network in terms of its ‘control’ on the flow of information along geodesic paths throughout the network. Two natural ways to extend vertex betweenness centrality to sets of vertices are (i) in terms of geodesic paths that pass through at least one of the vertices in the set, and (ii) in terms of geodesic paths that pass through all vertices in the set. The former was introduced by Everett and Borgatti [Everett, M., Borgatti, S., 1999. The centrality of groups and classes. Journal of Mathematical Sociology 23 (3), 181–201], and called group betweenness centrality. The latter, which we call co-betweenness centrality here, has not been considered formally in the literature until now, to the best of our knowledge. In this paper, we show that these two notions of centrality are in fact intimately related and, furthermore, that this relationship may be exploited to obtain deeper insight into both. In particular, we provide an expansion for group betweenness in terms of increasingly higher orders of co-betweenness, in a manner analogous to the Taylor series expansion of a mathematical function in calculus. We then demonstrate the utility of this expansion by using it to construct analytic lower and upper bounds for group betweenness that involve only simple combinations of (i) the betweenness of individual vertices in the group, and (ii) the co-betweenness of pairs of these vertices. Accordingly, we argue that the latter quantity, i.e., pairwise co-betweenness, is itself a fundamental quantity of some independent interest, and we present a computationally efficient algorithm for its calculation, which extends the algorithm of Brandes [Brandes, U., 2001. A faster algorithm for betweenness centrality. Journal of Mathematical Sociology 25, 163] in a natural manner. Applications are provided throughout, using a handful of different communication networks, which serve to illustrate the way in which our mathematical contributions allow for insight to be gained into the interaction of network structure, coalitions, and information flow in social networks. 相似文献
408.
Fundraising scholarship has focused on the application of public relations theory to the process particularly in exploring the predictive power in applying relationship management theory to the non-profit organization–donor relationship. However, people often are impacted by catastrophic events and want to donate to relief efforts even though they may not be connected to the region. A survey of two American Red Cross chapters’ donors revealed that individuals who contributed to the December 2004 tsunami relief efforts were more likely to experience feelings of cognitive dissonance than non-donors, and their donations resulted in a consonance restoration. These results support an argument for non-profits, particularly those in crisis response, to have an active crisis communication plan in place that deals not only with responding to the event but also having a proactive plan established to publicize how to donate to relief efforts. Highlighting the consonance restoration, non-profits should also discuss the positive aspects of donating to their efforts, such as the work being done for the disaster victims. 相似文献
409.
Ruthann Weaver Lariscy Elizabeth Johnson Avery Kaye D. Sweetser Pauline Howes 《Public Relations Review》2009,35(3):314-316
Using telephone surveys of business/financial journalists in the United States (n = 200), this research investigates the agenda-building role of social media content in journalists’ work. Understanding that more non-public relations content from user-generated and social network sites, like YouTube and Twitter, are fast becoming resources for journalists to get story ideas, break scandals, and find sources, we began this scholarly work to determine the frequency of such uses of social media. Overall, findings indicate very little use of social media by these business journalists. Results and implications for public relations practitioners are discussed in detail. 相似文献
410.
Humor is a significant weapon in interpersonal and intergroup conflict and competition. Over the centuries, males have used humor and jokes to create and perpetuate patriarchal ideals, relationships, and structures. Today, feminists and other proponents of gender equality use humor to deconstruct patriarchal ideologies and sexist stereotypes. This exploratory study analyzes a collection of over 1,700 jokes identified as feminist and women's humor to discover what these jokes suggest with regard to the male‐dominant structure in society and how these jokes are subversive in attempting to disrupt gender stereotypes and roles. We find that the humor of women and feminists seeks, in part, to discredit assumptions of males’ superiority, masterfulness, sexual prowess, and extraordinary value to women and society. These jokes may, however, also work to reinforce stereotypes associated with men and women: “If they could send a man to the moon, why not just send all of them?” 相似文献