全文获取类型
收费全文 | 12642篇 |
免费 | 296篇 |
专业分类
管理学 | 1644篇 |
民族学 | 51篇 |
人才学 | 1篇 |
人口学 | 1096篇 |
丛书文集 | 78篇 |
教育普及 | 2篇 |
理论方法论 | 1170篇 |
综合类 | 337篇 |
社会学 | 6344篇 |
统计学 | 2215篇 |
出版年
2021年 | 67篇 |
2020年 | 189篇 |
2019年 | 220篇 |
2018年 | 244篇 |
2017年 | 365篇 |
2016年 | 282篇 |
2015年 | 228篇 |
2014年 | 254篇 |
2013年 | 2048篇 |
2012年 | 394篇 |
2011年 | 317篇 |
2010年 | 213篇 |
2009年 | 234篇 |
2008年 | 261篇 |
2007年 | 278篇 |
2006年 | 217篇 |
2005年 | 350篇 |
2004年 | 296篇 |
2003年 | 257篇 |
2002年 | 269篇 |
2001年 | 314篇 |
2000年 | 297篇 |
1999年 | 309篇 |
1998年 | 209篇 |
1997年 | 204篇 |
1996年 | 214篇 |
1995年 | 188篇 |
1994年 | 204篇 |
1993年 | 177篇 |
1992年 | 236篇 |
1991年 | 232篇 |
1990年 | 211篇 |
1989年 | 219篇 |
1988年 | 194篇 |
1987年 | 185篇 |
1986年 | 189篇 |
1985年 | 174篇 |
1984年 | 207篇 |
1983年 | 200篇 |
1982年 | 165篇 |
1981年 | 137篇 |
1980年 | 139篇 |
1979年 | 166篇 |
1978年 | 136篇 |
1977年 | 119篇 |
1976年 | 102篇 |
1975年 | 101篇 |
1974年 | 95篇 |
1973年 | 93篇 |
1971年 | 64篇 |
排序方式: 共有10000条查询结果,搜索用时 437 毫秒
781.
Jon E. Grant JD MD MPH Brian L. Odlaug MPH Katherine Derbyshire BS Liana R. N. Schreiber BA Katherine Lust PhD MPH Gary Christenson MD 《Journal of American college health : J of ACH》2013,61(1):75-78
Abstract Objective: This study examined the prevalence of mental health disorders and their clinical correlates in a university sample of lesbian, gay, bisexual, and queer (LGBQ) students. Participants: College students at a large public university. Methods: An anonymous, voluntary survey was distributed via random e-mail generation to university students during April and May of 2011. LGBQ students were compared with their heterosexual counterparts on psychological and physical status as well as academic performance. Results: LGBQ students reported worse depressive symptoms, higher levels of perceived stress, considered themselves less attractive, and were more likely to be overweight. LGBQ students were significantly more likely to report histories of affective, substance use, and certain anxiety disorders as well as compulsive sexual behavior and compulsive buying. Conclusions: The higher rates of many psychiatric conditions among LGBQ students underscore the need for universities to provide LGBQ students a nonjudgmental environment to discuss sexual orientation and health issues. 相似文献
782.
One thousand and thirty‐two (566 non‐Asian; 466 Asian) undergraduates were assessed in a confidential laboratory setting regarding levels of physical abuse, emotional abuse, sexual abuse, neglect, and a wide range of sexuality variables. The purpose was to examine relationships between specific forms of early abuse and later adult sexuality, and to assess potential gender and ethnic differences in these associations. Independent of other forms of abuse, sexual abuse in females was significantly positively related to sexual drive and experience, range of sexual fantasies, liberal sexual attitudes, frequency of intercourse and masturbation, and likelihood of engaging in unrestricted sexual behaviors and fantasies, and was negatively related to virginity status. Among males, emotional abuse was significantly associated with poor body image and sexual dissatisfaction, independent of the other forms of abuse. There were no significant differences in associations between early abuse and sexuality between persons of Southeast Asian and European ancestry. 相似文献
783.
D. R. Cox Michelle Jackson Shiwei Lu 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2009,172(2):483-493
Summary. Square contingency tables with matching ordinal rows and columns arise in particular as empirical transition matrices and the paper considers these in the context of social class and income mobility tables. Such tables relate the socio-economic position of parents to the socio-economic position of their child in adulthood. The level of association between parental and child socio-economic position is taken as a measure of mobility. Several approaches to analysis are described and illustrated by UK data in which interest focuses on comparisons of social class and income mobility tables that are derived from the same individuals. Account is taken of the use of the same individuals in the two tables. Additionally comparisons over time are considered. 相似文献
784.
785.
Every adult can eliminate the risk of losing control of personal health decisions and financial resources by having a last will and testament, health proxy, power of attorney, and living trust. Yet evidence suggests that less than a majority of adult Americans have these documents. We surveyed 900 adult Americans (25 plus years old) to determine what factors predict the possession of these risk-reducing documents. In total, 46% had a living will and testament, 32% a durable power of attorney, 30% a health proxy, and 18% a living trust. Events that prompt people with wealth to secure these documents, such as increasing age, getting married, having children, and experiencing a life-threatening event were the strongest predictors of having a will. These were also among the strongest predictors of having a health proxy, along with a personal history of being proactive, and a family history that fostered trust of attorneys. Affluence, age, and education were the strongest predictors of having a living trust, and the strongest correlate of having a durable power of attorney was having faced a life-threatening event, positive experiences with attorneys, and higher educational achievement. 相似文献
786.
The smooth goodness of fit tests are generalized to singly censored data and applied to the problem of testing Weibull (or extreme value) fit. Smooth tests, Pearson-type tests, and the spacings tests proposed by Mann, Schemer, and Fertig (1973) are compared on the basis of local asymptotic relative efficiency with respect to the asymptotic best test against generalized gamma alternatives, The smooth test of order one Is found to be most efficient for the generalized gamma alternatives. 相似文献
787.
Survey data collected from a southwestern metropolitan area indicate that self-defined politically conservative individuals are less inclined to commit criminal or deviant acts than their liberal or moderate counterparts; however, results from multivariate analyses indicate that measures of self-control and pressure to conform all reduce the effects of political conservatism to nonsignificance. In general, the relationship between political ideology and misbehavior appears to be partly spurious and partly indirectly attributable to the effects of other social and situational factors. Moreover, responsiveness to pressures to conform is not due to self-control. The results provide some challenge to traditional interpretations of misbehavior but they also confirm an important part played by structural/contextual variables. 相似文献
788.
R. Mansell Prothero 《Population studies》2013,67(2):166-183
A brief survey of censuses previously taken in Northern Nigeria makes clear by comparison the importance of the 1952 Census in the acquisition of demographic data. Some of the problems of organising and conducting the census are considered. The analysis of the census results pays special attention to the pattern of population density but consideration is also given to age and sex structure, occupations, tribal data, literacy and religions. Shortcomings and omissions in the census, particularly the absence of any information on migration, are noted. The conclusion stresses the importance of the 1952 Census as a basis for future demographic studies ; the evidence for an increasing population but the absence of vital statistics to explain this ; the need for much further detailed analysis to be undertaken of the data in the 1952 Census. 相似文献
789.
William J. Hall Kristen D. Witkemper Grayson K. Rodgers Emily M. Waters Mark R. Smith 《Journal of gay & lesbian social services》2018,30(1):49-63
Purpose: Many students who are lesbian, gay, bisexual, transgender, or queer (LGBTQ) face hostile school environments that can negatively impact their mental health and education. This study involved a photovoice project where high school students from a gay-straight alliance in the rural southeastern United States took photographs that depicted the issues LGBTQ students were facing and then exhibited their photographs and stories to individuals from the school system and local community to promote awareness, dialogue, and action. Methods: Twenty adults who attended the photovoice exhibit responded to an online survey about their experiences with the intervention. Results: Eighty-five percent of adults reported that the intervention made them think about issues they had not previously considered, including the struggles LGBTQ youths face, gender issues, and living in a rural community. Common emotions experienced at the intervention included feeling excited, concern for the youths, and proud of the youths. Furthermore, 81% of the adults indicated that they would take action or behave differently as a result of the intervention, including supporting and affirming LGBTQ students, using gender-neutral and -inclusive language, and confronting bias in themselves and others. Conclusions: Photovoice is a promising strategy for LGBTQ students to activate adult allies in their community. 相似文献
790.
The effect of a single variable data point, x, on the usual test statistics for traditional hypothesis tests for means is analyzed. It is shown that an outlier may have a profound and unexpected effect on the test statistic. Although it might appear that an outlier would tend to lend support to the alternate hypothesis, it may in fact detract from the significance of the test. In one-population tests and analysis of variance (ANOVA), the value of x that maximizes the significance of the test statistic is given. This value does not have to be unusually large or small. In fact, it often falls within the range of the other sample points. In the general one-population case, the limiting value for the test statistic is shown to be +1. In the case involving more than one population, it is shown that the limiting value of the test statistic is a function only of the number of members in the samples and not their relative values. Special cases are identified in which the test statistic is shown to have unique characteristics depending on the characteristics of the data. 相似文献