全文获取类型
收费全文 | 25554篇 |
免费 | 679篇 |
国内免费 | 2篇 |
专业分类
管理学 | 3710篇 |
民族学 | 112篇 |
人才学 | 1篇 |
人口学 | 2433篇 |
丛书文集 | 95篇 |
教育普及 | 2篇 |
理论方法论 | 2280篇 |
现状及发展 | 1篇 |
综合类 | 323篇 |
社会学 | 12013篇 |
统计学 | 5265篇 |
出版年
2023年 | 124篇 |
2021年 | 154篇 |
2020年 | 371篇 |
2019年 | 522篇 |
2018年 | 606篇 |
2017年 | 843篇 |
2016年 | 646篇 |
2015年 | 460篇 |
2014年 | 640篇 |
2013年 | 4275篇 |
2012年 | 821篇 |
2011年 | 806篇 |
2010年 | 582篇 |
2009年 | 532篇 |
2008年 | 609篇 |
2007年 | 612篇 |
2006年 | 624篇 |
2005年 | 595篇 |
2004年 | 539篇 |
2003年 | 497篇 |
2002年 | 560篇 |
2001年 | 673篇 |
2000年 | 687篇 |
1999年 | 605篇 |
1998年 | 454篇 |
1997年 | 412篇 |
1996年 | 406篇 |
1995年 | 380篇 |
1994年 | 401篇 |
1993年 | 370篇 |
1992年 | 439篇 |
1991年 | 424篇 |
1990年 | 384篇 |
1989年 | 366篇 |
1988年 | 366篇 |
1987年 | 321篇 |
1986年 | 318篇 |
1985年 | 351篇 |
1984年 | 347篇 |
1983年 | 303篇 |
1982年 | 276篇 |
1981年 | 221篇 |
1980年 | 210篇 |
1979年 | 251篇 |
1978年 | 218篇 |
1977年 | 198篇 |
1976年 | 167篇 |
1975年 | 193篇 |
1974年 | 154篇 |
1973年 | 130篇 |
排序方式: 共有10000条查询结果,搜索用时 609 毫秒
981.
Rikke Frank Jørgensen 《Information, Communication & Society》2018,21(3):340-355
This article explores human rights storytelling within two of the dominant internet companies, Google and Facebook. Based on interview with company staff as well as analysis of publicly available statements, the article examines how human rights are framed, made sense of and translated into company norms, products, and governance structures. The paper argues that the companies’ framing in many respects resembles that of the United States’ online freedom agenda, celebrating the liberating power of the internet and perceiving human rights as primarily safeguards against repressive governments. The companies see freedom of expression as part of their DNA and do not perceive any contradiction between this standard and business practices that may impact negatively on users’ freedom of expression, such as terms of service enforcement. Likewise, there is no sense of conflict between the online business model and their users’ right to privacy. 相似文献
982.
Infant Sex Moderates the Effects of Maternal Pre‐ and Postnatal Stress on Executive Functioning at 8 Months of Age
下载免费PDF全文
![点击此处可从《Infancy》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Saara Nolvi Henri Pesonen David J. Bridgett Riikka Korja Eeva‐Leena Kataja Hasse Karlsson Linnea Karlsson 《Infancy》2018,23(2):194-210
Previous studies report that early life stress, including maternal pre‐ and postnatal stress, has adverse effects on cognitive development and that these associations might be sex‐specific. However, no studies exist on early life stress and infant executive functioning (EF). The aim of this study was to examine the relationship between maternal pre‐ and postnatal stress and infant EF, and whether these associations are moderated by infant sex. Maternal prenatal depressive, general anxiety, and pregnancy‐specific anxiety symptoms were measured three times, and postnatal depressive and general anxiety symptoms were measured 6 months postpartum. Infant EF was assessed with a modified A‐not‐B task 8 months postpartum (N = 214). Maternal postnatal general anxiety predicted poorer EF in girls in comparison with boys. Moreover, there was a trend toward an interaction between prenatal anxiety and infant sex such that prenatal anxiety predicted infant EF differently in girls and in boys. No association was found between depressive symptoms or pregnancy‐specific anxiety symptoms and infant EF. These findings suggest that maternal anxiety may have sex‐specific effects on early EF and that pre‐ and postnatal stress may differently affect infant EF/cognitive development. The implications of these findings and important future directions are discussed. 相似文献
983.
What drives infants’ attention in complex visual scenes? Early models of infant attention suggested that the degree to which different visual features were detectable determines their attentional priority. Here, we tested this by asking whether two targets—defined by different features, but each equally salient when evaluated independently—would drive attention equally when pitted head‐to‐head. In Experiment 1, we presented 6‐month‐old infants with an array of Gabor patches in which a target region varied either in color or spatial frequency from the background. Using a forced‐choice preferential‐looking method, we measured how readily infants fixated the target as its featural difference from the background was parametrically increased. Then, in Experiment 2, we used these psychometric preference functions to choose values for color and spatial frequency targets that were equally salient (preferred), and pitted them against each other within the same display. We reasoned that if salience is transitive, then the stimuli should be iso‐salient and infants should therefore show no systematic preference for either stimulus. On the contrary, we found that infants consistently preferred the color‐defined stimulus. This suggests that computing visual salience in more complex scenes needs to include factors above and beyond local salience values. 相似文献
984.
Negative (But Not Positive) Parenting Interacts with Infant Negative Affect to Predict Infant Approach: Evidence of Diathesis‐Stress
下载免费PDF全文
![点击此处可从《Infancy》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Jacob B. Holzman Nicole M. Burt Erin S. Edwards Leanna D. Rosinski David J. Bridgett 《Infancy》2018,23(3):471-480
Temperament by parenting interactions may reflect that individuals with greater risk are more likely to experience negative outcomes in adverse contexts (diathesis‐stress) or that these individuals are more susceptible to contextual influences in a “for better or for worse” pattern (differential susceptibility). Although such interactions have been identified for a variety of child outcomes, prior research has not examined approach characteristics—excitement and approach toward pleasurable activities—in the first year of life. Therefore, this study investigated whether 6‐month maternal reported infant negative affect—a phenotypic marker of risk/susceptibility—interacted with 8‐month observed parenting behaviors (positive parenting, negative parenting) to predict 12‐month infant behavioral approach. Based on a sample of mothers and their infants (N = 150), results indicated that negative parenting was inversely associated with subsequent approach for infants with high, but not low, levels of negative affect. Similar results did not occur regarding positive parenting. These findings better fit a diathesis‐stress model rather than a differential susceptibility model. Implications and limitations of these findings are discussed. 相似文献
985.
This article asks whether hymns written prior to and following the Second Vatican Council (Vatican II) differ significantly in their use of self- and divine-referential pronouns and answers this question by content analyzing the lyrics of 196 hymns in two different hymnals used in Catholic parishes today. It finds that hymns written post-Vatican II contain significantly more self-referential pronouns as well as an interestingly different mix of divine-referential pronouns than hymns written pre-Vatican II. These findings contribute to our knowledge of how shifts in religious organizations’ identities find expression in liturgical texts, which is important for understanding how the religious identities of individuals and communities are socially constructed over time. 相似文献
986.
In this article, we apply Peter Berger's theory of religion as a social construct to learn how The Church of Jesus Christ of Latter-day Saints (the Mormon Church) advances a heteronormative view of family relationships in the United States using a document titled The Family: A Proclamation to the World. Furthermore, applying cultural studies theory, we examine how believing Mormons negotiate the tension that arises when their secular values compete with those expressed by Church leaders. We argue that, although the Proclamation addresses a number of issues, the Church offers a closed text that emphasizes war narratives in which same-sex marriage is portrayed as a threat to LDS identity and the heteronormative family. This closed text is further legitimized by emphasis on the authority of Church leaders as oracles of God. The study participants largely accept the dominant narrative, and those who reject it, do so with some trepidation. 相似文献
987.
Rolf Aaberge Anthony B. Atkinson Sebastian Königs 《Journal of Economic Inequality》2018,16(2):295-320
Public debates about the rise in top income shares often focus on the growing dispersion in earnings, and the soaring pay for top executives and financial-sector employees. But can the change in the marginal distribution of earnings on its own explain the rise in top income shares? Are top executives replacing capital owners in the group of top-income earners, or are we rather witnessing a fusion of top capital and top earnings? This paper proposes an extension of the copula framework and uses it for exploring the changing composition of top incomes. It illustrates that changes in top income shares can easily be decomposed into respective changes in the marginal distributions of labour and capital income and the changing association between the two types of income. An application using tax record data from Norway shows that the association between top labour and capital incomes grew stronger between 1995 and 2005 in the top half of the wage and capital income distribution, though it declined for the top 1% of capital income receivers. A gender decomposition demonstrates that the association of wage and capital incomes at the top is particularly striking for men, whilst women are largely under-represented in the top halves of the two marginal distributions. 相似文献
988.
Daniel Aggio Olia Papacosta Lucy T. Lennon Sarah Ash Peter H. Whincup S. Goya Wannamethee Barbara J. Jefferis 《European review of aging and physical activity》2018,15(1):16
Background
Previous physical activity (PA) tracking studies have examined the stability of overall PA and/or PA types, but few have investigated how specific types of sport/exercise track over the life course. The aim of this study was to determine how specific sports/exercises in midlife track and predict future sport/exercise and PA in men transitioning to old age.Methods
Seven thousand seven hundred thirty-five men (aged 40–59?years) recruited in 1978–80 were followed up after 12, 16 and 20?years. At each wave men self-reported participation in sport/exercise. Frequent sport/exercise participants (>?1/month) reported the types of sport/exercise they engaged in. Men also reported total PA, health status, lifestyle behaviours and socio-demographic characteristics. Stability of each sport/exercise was assessed using kappa statistics and intraclass correlation coefficients. Logistic regression estimated the odds of participating in sport/exercise and being active at 20-year follow up according to specific types of sport/exercise in midlife.Results
Three thousand three hundred eighty-four men with complete data at all waves were included in analyses. Tracking of specific sports/exercises ranged from fair to substantial, with golf being the most common and most stable. Bowls was the most frequently adopted. Odds of participating in sport/exercise and being active in old age varied according to sport/exercise types in midlife. Golf and bowls in midlife were the strongest predictors of sport/exercise participation in old age. Golf, cricket and running/jogging in midlife were among the strongest predictors of being active in old age. Compared to participating in just one sport/exercise in midlife, sampling multiple sports/exercises was more strongly associated with sport/exercise participation and being active in old age.Conclusion
The stability of sport/exercise participation from midlife to old age varies by type. Specific sports/exercises in midlife may be more likely to predict future PA than others. However, participating in a range of sports/exercises may be optimal for preserving PA into old age.989.
Philippe Jean-Luc Gradidge Shane A. Norris Richard Munthali Nigel J. Crowther 《European review of aging and physical activity》2018,15(1):6
Background
The increasing prevalence of obesity in sub-Saharan African women is not well understood, and black South African women in the region are particularly vulnerable. This study aimed to examine whether the relationship of socioeconomic status (SES) with changes in body mass index (BMI) and waist circumference (WC) is mediated by physical activity in ageing African women.Methods
In a longitudinal analysis of the 518 caregivers associated with the Birth to Twenty Plus study, the role of SES associated with 10-year changes in BMI and WC was tested using structural equation modelling (SEM). The degree of mediation of moderate-vigorous physical activity (MVPA) and sitting time in this association was also assessed.Results
The prevalence of obesity increased significantly from baseline to follow-up (p?<?0.0001). In the SEM models, baseline SES had a direct positive effect on changes in BMI (β, 95% CI, 0.02 (0.005 to 0.04), and a direct negative effect on changes in MVPA (β, 95% CI, ??3.81 (??6.92 to ??0.70). Baseline MVPA had a direct negative effect (β, 95% CI, ??0.002 (??0.003 to ??0.0003) and indirect positive effect via change in MVPA (β, 95% CI, 0.01 (0.0001 to 0.001) on change in WC.Conclusions
Our study demonstrates the role and interaction of sociodemographic and behavioural predictors of obesity, and suggests a multifaceted approach to management of the crisis in communities of ageing urban African women.990.