全文获取类型
收费全文 | 17047篇 |
免费 | 260篇 |
国内免费 | 2篇 |
专业分类
管理学 | 2499篇 |
民族学 | 78篇 |
人口学 | 1541篇 |
丛书文集 | 65篇 |
理论方法论 | 1357篇 |
综合类 | 301篇 |
社会学 | 7393篇 |
统计学 | 4075篇 |
出版年
2023年 | 106篇 |
2020年 | 267篇 |
2019年 | 357篇 |
2018年 | 456篇 |
2017年 | 601篇 |
2016年 | 455篇 |
2015年 | 335篇 |
2014年 | 419篇 |
2013年 | 2934篇 |
2012年 | 566篇 |
2011年 | 487篇 |
2010年 | 394篇 |
2009年 | 369篇 |
2008年 | 415篇 |
2007年 | 441篇 |
2006年 | 385篇 |
2005年 | 356篇 |
2004年 | 323篇 |
2003年 | 293篇 |
2002年 | 328篇 |
2001年 | 405篇 |
2000年 | 358篇 |
1999年 | 315篇 |
1998年 | 253篇 |
1997年 | 250篇 |
1996年 | 248篇 |
1995年 | 217篇 |
1994年 | 189篇 |
1993年 | 222篇 |
1992年 | 269篇 |
1991年 | 241篇 |
1990年 | 242篇 |
1989年 | 217篇 |
1988年 | 197篇 |
1987年 | 201篇 |
1986年 | 194篇 |
1985年 | 192篇 |
1984年 | 216篇 |
1983年 | 213篇 |
1982年 | 186篇 |
1981年 | 151篇 |
1980年 | 174篇 |
1979年 | 197篇 |
1978年 | 160篇 |
1977年 | 157篇 |
1976年 | 135篇 |
1975年 | 148篇 |
1974年 | 120篇 |
1973年 | 116篇 |
1971年 | 102篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
V. Scott H. Solberg Aaron H. Carlstrom Kimberly A. S. Howard Janice E. Jones 《The Career development quarterly》2007,55(4):313-327
Using cluster analysis, 789 predominately Latino and African American high school youth were classified into varying academic at‐risk profiles using self‐reported levels of academic confidence, motivation to attend school, perceived family support, connections with teachers and peers, and exposure to violence. Six clusters emerged, 5 of which were identified as “at‐risk.” The clusters were examined in relation to academic stress, health status, grades, and school retention. Exposure to violence was one distinguishing feature of youth identified as most vulnerable, vulnerable, and resilient; however, youth identified as resilient recorded better academic outcomes. 相似文献
82.
Peltzman [Peltzman, S., 1984. Constituent interest and congressional voting. Journal of Law and Economics 27, 181–210] argues that if constituents’ economic interests have well-defined “winners and losers” and are appropriately measured, then constituents’ economic interests, and not legislator ideology, are the most important determinates of legislator voting. We test Peltzman's theory by examining senatorial voting on three mandated spending limitation bills. We find, consistent with Peltzman's theory, that the ratio of federal spending in a senator's state to federal taxes paid by that state, and not a senator's personal ideology, matters on legislation where there are well-defined economic “winners and losers.” This is particularly important because unlike other constituents’ economic interest measures that only impact a fraction of the constituency, the ratio of federal spending to federal taxes in a state represents the economic interests of all the constituents in a state. 相似文献
83.
In this study, individualism vs collectivism, in line with the work of Triandis in 1985, was assessed in two groups of male and female students, in Egypt and Germany. The results confirm the effect that cultural background has on individualist vs collectivist orientations in both of these cultures for male and female students. Men and women scored higher on individualism in Germany than in Egypt, whereas collectivism scores were higher in Egypt than in Germany. These findings are discussed in terms of general recommendations for intercultural interventions that discourage viewing people solely in terms of group membership, and instead as distinct individuals. 相似文献
84.
James P. McDermott G. Jogesh Babu John C. Liechty Dennis K. J. Lin 《Statistics and Computing》2007,17(4):311-321
We consider the problem of density estimation when the data is in the form of a continuous stream with no fixed length. In
this setting, implementations of the usual methods of density estimation such as kernel density estimation are problematic.
We propose a method of density estimation for massive datasets that is based upon taking the derivative of a smooth curve
that has been fit through a set of quantile estimates. To achieve this, a low-storage, single-pass, sequential method is proposed
for simultaneous estimation of multiple quantiles for massive datasets that form the basis of this method of density estimation.
For comparison, we also consider a sequential kernel density estimator. The proposed methods are shown through simulation
study to perform well and to have several distinct advantages over existing methods. 相似文献
85.
Constrained allocation problems with single-peaked preferences: An axiomatic analysis 总被引:1,自引:0,他引:1
Özgür Kıbrıs 《Social Choice and Welfare》2003,20(3):353-362
We introduce a new class of problems that contains two existing classes: allocation problems with single-peaked preferences
and bankruptcy problems. On this class, we analyze the implications of well-known properties such as Pareto optimality, strategy-proofness,
resource-monotonicity, no-envy, equal treatment of equals, and two new properties we introduce, hierarchical no-envy and independence
of nonbinding constraints. Unlike earlier literature, we consider rules that allow free-disposability. We present characterizations
of a rule we introduce on this domain. We relate this rule to well-known rules on the aforementioned subdomains. Based on
this relation, we present a characterization of a well-known bankruptcy rule called the constrained equal awards rule.
Received: 22 June 2000/Accepted: 21 March 2002
This paper is based on the first chapter of my Ph.D. thesis submitted to the University of Rochester. I wish to thank my
advisor, William Thomson, for helpful comments and suggestions. 相似文献
86.
The authors propose graphical and numerical methods for checking the adequacy of the logistic regression model for matched case‐control data. Their approach is based on the cumulative sum of residuals over the covariate or linear predictor. Under the assumed model, the cumulative residual process converges weakly to a centered Gaussian limit whose distribution can be approximated via computer simulation. The observed cumulative residual pattern can then be compared both visually and analytically to a certain number of simulated realizations of the approximate limiting process under the null hypothesis. The proposed techniques allow one to check the functional form of each covariate, the logistic link function as well as the overall model adequacy. The authors assess the performance of the proposed methods through simulation studies and illustrate them using data from a cardiovascular study. 相似文献
87.
88.
Ricardo Maronna Matthias Fischer Jürgen Groß Andreas Karlsson 《Statistical Papers》2007,48(1):163-170
89.
90.
Over the first years of life, infants gradually develop the ability to retrieve their memories across cue and contextual changes. Whereas maturational factors drive some of these developments in memory ability, experiences occurring within the learning event may also impact infants' ability to retrieve memories in new situations. In 2 experiments we examined whether it was possible to facilitate 12‐month‐old infants' generalization of learning in the deferred imitation paradigm by varying experiences before or during the demonstration session, or during the retention interval. In Experiment 1, altering the length, timing, or variability of training had no impact on generalization; infants showed a low, but consistent level of memory retrieval. In Experiment 2, infants who experienced a unique context for encoding and retrieval exhibited generalization; infants who experienced the context prior to the demonstration session, or during the retention interval, did not. Specificity is a robust feature of infant memory and is not substantially altered by encoding experiences in an observational learning paradigm. Previous history with a learning environment can, however, impact the flexibility of memory retrieval. 相似文献