首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   19815篇
  免费   525篇
管理学   2381篇
民族学   107篇
人才学   6篇
人口学   1866篇
丛书文集   114篇
教育普及   2篇
理论方法论   1838篇
现状及发展   1篇
综合类   282篇
社会学   9779篇
统计学   3964篇
  2023年   97篇
  2021年   106篇
  2020年   300篇
  2019年   485篇
  2018年   498篇
  2017年   686篇
  2016年   474篇
  2015年   378篇
  2014年   462篇
  2013年   3389篇
  2012年   708篇
  2011年   616篇
  2010年   489篇
  2009年   464篇
  2008年   519篇
  2007年   524篇
  2006年   486篇
  2005年   439篇
  2004年   432篇
  2003年   408篇
  2002年   402篇
  2001年   498篇
  2000年   423篇
  1999年   422篇
  1998年   345篇
  1997年   303篇
  1996年   310篇
  1995年   296篇
  1994年   284篇
  1993年   276篇
  1992年   308篇
  1991年   309篇
  1990年   282篇
  1989年   273篇
  1988年   265篇
  1987年   255篇
  1986年   238篇
  1985年   273篇
  1984年   264篇
  1983年   254篇
  1982年   199篇
  1981年   172篇
  1980年   185篇
  1979年   184篇
  1978年   158篇
  1977年   151篇
  1976年   137篇
  1975年   124篇
  1974年   105篇
  1973年   86篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
951.
An ongoing question remains for family researchers: Why does a positive association between cohabitation and marital dissolution exist when one of the primary reasons to cohabit is to test relationship compatibility? Drawing on recently collected data from the 2006–2008 National Survey of Family Growth, the authors examined whether premarital cohabitation experiences were associated with marital instability among a recent contemporary (married since 1996) marriage cohort of men (N = 1,483) and women (N = 2,003). They found that a dichotomous indicator of premarital cohabitation was in fact not associated with marital instability among women and men. Furthermore, among cohabitors, marital commitment prior to cohabitation (engagement or definite plans for marriage) was tied to lower hazards of marital instability among women, but not men. This research contributes to our understanding of cohabitation, marital instability, and broader family change.  相似文献   
952.
Fathers' absence is a pattern that shows intergenerational continuity, most notably within disadvantaged populations. The process whereby this pattern is repeated across generations is not well understood. Using data from the Concordia Longitudinal Risk Project, the authors investigated pathways between fathers' absence in 1 generation and the experience of fathers' absence by their children. The current sample included 386 socioeconomically at‐risk individuals across 2 waves of data collection: (a) when they were children and (b) when they were adults with their own children. Analyses based on structural equation modeling revealed that men whose fathers were absent when they were children were more likely to become absent fathers, and women whose fathers were absent when they were children were more likely to have children with absent partners. Indirect pathways between fathers' absence in 2 generations through aggression, education, and substance abuse were illustrated for women. These findings add to the literature suggesting that fathers' absence during childhood has intergenerational effects.  相似文献   
953.
This study investigated the association between sexual practices and duration of a sexual encounter. Using data from a population-based computer-assisted telephone survey of 8,656 Australians aged 16 to 64 years, four distinct patterns of sexual practices among respondents were found: "basic sexual encounter" (involving mainly kissing, cuddling, stroking one's partner and being stroked, and vaginal intercourse), "basic sexual encounter plus oral sex," "all assessed sexual practices" (all sexual behaviors included in the survey), and "mainly vaginal intercourse" (characterized by lower levels of kissing, cuddling, and stroking). For both men and women, respondents classified in the basic sexual encounter plus oral sex, and all assessed sexual practices clusters reported significantly longer durations than those in the basic sexual encounter group, whereas respondents in the mainly vaginal intercourse cluster reported shorter durations. These differences were found even after allowing for demographic differences in sexual duration-specifically, age and partner type of the most recent opposite-sex partner. These findings add to the understanding of what typically happens in a sexual encounter. Overall, longer sexual encounters appear to be associated with the inclusion of the least common sexual practices-namely, oral sex and self-stimulation.  相似文献   
954.
Many theoretical models examining health risk behaviors, such as sexual risk taking, assume intentions directly predict behavior, and intentions are sometimes measured as a proxy for behavior. Given that there is often a discrepancy between intentions and behaviors (e.g., Sheeran, 2002 ), this study addressed factors that predict intention-behavior congruence. Specifically, utilizing a prospective design, the goal of the study was to determine if characteristics of university students' last sexual encounter predicted whether those students who intended to use condoms, contraception, or dual methods did so in their last sexual encounter with both relationship and casual partners. The seven tested variables were condom planning and preparatory behaviors, mood, sexual arousal, substance use, perceived partner attractiveness, intention certainty, and intention stability. Data were collected from 520 American undergraduate students at a medium-sized university. The six discriminant function analyses examining the intention-behavior relationship were able to correctly classify between 74% and 92% of the participants concerning whether intenders engaged in safe sex behaviors. The variables that best discriminated between behavior engagement over the six analyses were intention stability, intention certainty, and engagement in condom preparatory behaviors. The implications of these results for sexual risk prevention and intervention research are discussed.  相似文献   
955.
956.
Many studies have documented significant differences in sexual desire between individuals of European and Chinese descent, but few have examined the mechanisms that underlie these differences. A recent study of university students found that sex guilt is one mechanism by which culture influences sexual desire among Chinese and Euro-Canadian women. The goal of this study was to examine whether sex guilt also mediates the relationship between ethnicity and sexual desire in a sample that is more representative of women in the general population. Euro-Canadian (n = 78; mean age = 42.1 years) and Chinese (n = 87; mean age = 42.8 years) women were recruited from the community. Euro-Canadian women reported greater sexual desire and less sex guilt. In the entire sample, sex guilt mediated the relationship between ethnicity and sexual desire such that the Chinese women reported greater sex guilt, which, in turn, was associated with lower sexual desire. Among the Chinese women, sex guilt mediated the relationship between mainstream acculturation (degree of Westernization) and sexual desire such that more Westernized Chinese women reported less sex guilt, which, in turn, was associated with greater sexual desire. These results support recent findings and further suggest that sex guilt may be one mechanism by which ethnicity affects sexual desire.  相似文献   
957.
Wing‐Chung Ho offers an extensive critique of what he calls our “radical constructionist approach to family experience,” questioning the theoretical validity and empirical utility of the research program. This article responds to the charges in the broader context of the program's constructionist analytics, discussing family's experiential location, organizational embeddedness, and the importance of ethnographic sensibility. A brief extract of situated talk and interaction is presented to illustrate the discursive complexity and institutional bearings of family as a category of experience. The conclusion takes up the issue of whether the program is radical in conceptualization and empirical realization.  相似文献   
958.
Various strategies are used as tools in health promotion campaigns to increase health-related outcomes among target populations. Evaluations of these campaigns examine effects on changing people's knowledge, attitudes, and/or behaviors. Most evaluations examine the combined impact of multiple strategies. Less is known about the unique effects of particular strategies. To address this gap, we used highly systematic methods to identify and review scientifically rigorous evaluations of 18 campaigns that examined the unique effects of three sets of intervention strategies (entertainment education, law enforcement, and mass media) on changes in knowledge, attitudes, and practice with regard to various health behaviors. Results showed differences in evaluation processes based on the type of strategy used to promote campaign messages. For instance, evaluations of mass-media based campaigns were more likely to examine changes in knowledge, relative to evaluations of campaigns that used law enforcement strategies. In addition, campaign effects varied by particular strategies. Mass media-based campaigns were more likely to affect knowledge, relative to behaviors. Law enforcement and entertainment education-based campaigns showed positive effects on behaviors. The implications for planning and evaluating health promotion campaigns are described.  相似文献   
959.
This study compares self-reported readiness to engage in college between a sample of 81 college freshmen who aged out of foster care prior to or while attending a large four-year public university and the national freshman population. Results indicate that students from foster care are significantly different from their non-foster-care peers in their readiness to engage in college. The results also show that foster youth are less well prepared academically upon entering college and this performance gap persists through the first semester of college. These findings are examined in the context of the current literature on foster youth. Limitations of the study and implications for future research and practice are discussed.  相似文献   
960.
A necessary and sufficient condition for dominant strategy implementability when preferences are quasilinear is that, for every individual i and every choice of the types of the other individuals, all k-cycles in i’s allocation graph have nonnegative length for every integer k ≥ 2. Saks and Yu (Proceedings of the 6th ACM conference on electronic commerce (EC’05), pp 286–293, 2005) have shown that when the number of outcomes is finite and i’s valuation type space is convex, nonnegativity of the length of all 2-cycles is sufficient for the nonnegativity of the length of all k-cycles. In this article, it is shown that if each individual’s valuation type space is a full-dimensional convex product space and a mild domain regularity condition is satisfied, then (i) the nonnegativity of all 2-cycles implies that all k-cycles have zero length and (ii) all 2-cycles having zero length is necessary and sufficient for dominant strategy implementability.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号