全文获取类型
收费全文 | 12935篇 |
免费 | 339篇 |
专业分类
管理学 | 1679篇 |
民族学 | 55篇 |
人口学 | 1031篇 |
丛书文集 | 67篇 |
教育普及 | 3篇 |
理论方法论 | 1195篇 |
综合类 | 130篇 |
社会学 | 6861篇 |
统计学 | 2253篇 |
出版年
2023年 | 66篇 |
2021年 | 69篇 |
2020年 | 168篇 |
2019年 | 260篇 |
2018年 | 276篇 |
2017年 | 391篇 |
2016年 | 280篇 |
2015年 | 228篇 |
2014年 | 307篇 |
2013年 | 2568篇 |
2012年 | 368篇 |
2011年 | 354篇 |
2010年 | 271篇 |
2009年 | 248篇 |
2008年 | 277篇 |
2007年 | 275篇 |
2006年 | 292篇 |
2005年 | 268篇 |
2004年 | 229篇 |
2003年 | 209篇 |
2002年 | 227篇 |
2001年 | 311篇 |
2000年 | 287篇 |
1999年 | 305篇 |
1998年 | 199篇 |
1997年 | 182篇 |
1996年 | 223篇 |
1995年 | 229篇 |
1994年 | 240篇 |
1993年 | 231篇 |
1992年 | 243篇 |
1991年 | 233篇 |
1990年 | 253篇 |
1989年 | 216篇 |
1988年 | 221篇 |
1987年 | 190篇 |
1986年 | 179篇 |
1985年 | 186篇 |
1984年 | 191篇 |
1983年 | 139篇 |
1982年 | 134篇 |
1981年 | 123篇 |
1980年 | 130篇 |
1979年 | 125篇 |
1978年 | 106篇 |
1977年 | 90篇 |
1976年 | 90篇 |
1975年 | 94篇 |
1974年 | 64篇 |
1973年 | 56篇 |
排序方式: 共有10000条查询结果,搜索用时 796 毫秒
281.
Observational stance refers to the perspective a person takes while viewing a sexual stimulus, either as a passive observer (observer stance) or an active participant (participant stance). The objective of the current study was to examine the relationship between observational stance and sexual arousal (subjective and genital) across a range of sexual stimuli that do or do not correspond with a participant's sexual attraction (preferred or nonpreferred stimuli, respectively). Regression analyses revealed that, for men (n = 44), participant stance significantly predicted subjective and genital arousal. Women's (n = 47) observer and participant stance predicted subjective arousal but not genital arousal. Analysis of variance showed that participant stance was greatest under preferred sexual stimuli conditions for all groups of participants, while observer stance scores revealed a less consistent pattern of response. This was particularly true for opposite-sex-attracted women, whose ratings of observer stance were lowest for preferred stimuli. Observational stance does not appear to account for gender differences in specificity of sexual arousal; for men, however, participant stance uniquely predicted genital response after controlling for sexual attractions. Similarities in the relationships between men's and women's observational stance and sexual responses challenge previous claims of gender differences in how men and women view erotica. 相似文献
282.
283.
Clark L Crooks B Clarke R Aitken MR Dunn BD 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2012,28(1):123-137
Near-miss outcomes during gambling are non-win outcomes that fall close to a pay-out. While objectively equivalent to an outright
miss, near-misses motivate ongoing play and may therefore be implicated in the development of disordered gambling. Given naturalistic
data showing increases in heart rate (HR) and electrodermal activity (EDA) during periods of real gambling play, we sought
to explore the phasic impact of win, near-miss and full-miss outcomes on physiological arousal in a controlled laboratory
environment. EDA and HR were monitored as healthy, student participants (n = 33) played a simulated slot-machine task involving
unpredictable monetary wins. A second gambling distortion, perceived personal control, was manipulated within the same task
by allowing the participant to select the play icon on some trials, and having the computer automatically select the play
icon on other trials. Near-misses were rated as less pleasant than full-misses. However, on trials that involved personal
choice, near-misses produced higher ratings of ‘continue to play’ than full-misses. Winning outcomes were associated with
phasic EDA responses that did not vary with personal choice. Compared to full-misses, near-miss outcomes also elicited an
EDA increase, which was greater on personal choice trials. Near-misses were also associated with greater HR acceleration than
other outcomes. Near-miss outcomes are capable of eliciting phasic changes in physiological arousal consistent with a state
of subjective excitement, despite their objective non-win status. 相似文献
284.
Richard T. Lapan Amanda M. Marcotte Robert Storey Patricia Carbone Sharon Loehr‐Lapan Donna Guerin Teisha Thomas Deidre Cuffee‐Grey Aria Coburn Teresa Pfeiffer Latoya Wilson Stephen Mahoney 《The Career development quarterly》2016,64(2):126-139
An approach is presented for strengthening middle school standards‐based English language arts (ELA) classroom instruction by infusing theory‐ and research‐supported career development constructs and practices. Over an 8‐week period, 90 urban 7th graders participated in an integrated ELA–career development curriculum. Career agency emerged as an important construct for students. It was related to key markers of ELA achievement (i.e., standardized test scores, grades, and positive change in 6th‐ to 7th‐grade test scores) and elaborated on in nuanced ways by students in their written narratives. Four themes related to career agency were identified in student writings: time perspective, challenges of self‐direction, career development, and social and emotional development. Advantages for students and schools related to synergy, scale, and sustainability are discussed. 相似文献
285.
286.
287.
Toxicologists and pharmacologists often describe toxicity of a chemical using parameters of a nonlinear regression model. Thus estimation of parameters of a nonlinear regression model is an important problem. The estimates of the parameters and their uncertainty estimates depend upon the underlying error variance structure in the model. Typically, a priori the researcher would not know if the error variances are homoscedastic (i.e., constant across dose) or if they are heteroscedastic (i.e., the variance is a function of dose). Motivated by this concern, in this paper we introduce an estimation procedure based on preliminary test which selects an appropriate estimation procedure accounting for the underlying error variance structure. Since outliers and influential observations are common in toxicological data, the proposed methodology uses M-estimators. The asymptotic properties of the preliminary test estimator are investigated; in particular its asymptotic covariance matrix is derived. The performance of the proposed estimator is compared with several standard estimators using simulation studies. The proposed methodology is also illustrated using a data set obtained from the National Toxicology Program. 相似文献
288.
Richard G. Spencer Benjamin D. Cortese Vanessa A. Lukas Nancy Pleshko 《The American statistician》2017,71(1):81-87
In a wide variety of biomedical and clinical research studies, sample statistics from diagnostic marker measurements are presented as a means of distinguishing between two populations, such as with and without disease. Intuitively, a larger difference between the mean values of a marker for the two populations, and a smaller spread of values within each population, should lead to more reliable classification rules based on this marker. We formalize this intuitive notion by deriving practical, new, closed-form expressions for the sensitivity and specificity of three different discriminant tests defined in terms of the sample means and standard deviations of diagnostic marker measurements. The three discriminant tests evaluated are based, respectively, on the Euclidean distance and the Mahalanobis distance between means, and a likelihood ratio analysis. Expressions for the effects of measurement error are also presented. Our final expressions assume that the diagnostic markers follow independent normal distributions for the two populations, although it will be clear that other known distributions may be similarly analyzed. We then discuss applications drawn from the medical literature, although the formalism is clearly not restricted to that application. 相似文献
289.
290.
Sarah Diem Anjalé D. Welton Erica Frankenberg Jennifer Jellison Holme 《Race Ethnicity and Education》2016,19(4):731-762
Suburbs across the US are experiencing dramatic demographic shifts, yet there is little research available on how suburban school districts are dealing with these changes. In this article, we examine the discourses surrounding race and demographic change in three suburban school districts that have been undergoing rapid demographic changes and which contain demographically distinct areas within their district boundaries. Utilizing a critical discourse analysis (CDA) approach, we analyze how the policy context (federal and state) frames actors’ discourses and understandings of race, paying particular attention to the political and institutional factors affecting school policy. We illustrate how the discourse, in turn, is related to the actions (or inactions) taken by district and school leaders to respond to demographic change. We conclude the article by discussing policy implications and potential challenges districts may face in the future if efforts to purposively address racial changes continue to be avoided. 相似文献