全文获取类型
收费全文 | 14042篇 |
免费 | 364篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1806篇 |
民族学 | 67篇 |
人才学 | 4篇 |
人口学 | 1241篇 |
丛书文集 | 69篇 |
理论方法论 | 1287篇 |
综合类 | 113篇 |
社会学 | 6844篇 |
统计学 | 2976篇 |
出版年
2023年 | 73篇 |
2022年 | 71篇 |
2021年 | 81篇 |
2020年 | 211篇 |
2019年 | 278篇 |
2018年 | 390篇 |
2017年 | 517篇 |
2016年 | 358篇 |
2015年 | 288篇 |
2014年 | 374篇 |
2013年 | 2554篇 |
2012年 | 483篇 |
2011年 | 380篇 |
2010年 | 368篇 |
2009年 | 281篇 |
2008年 | 337篇 |
2007年 | 339篇 |
2006年 | 345篇 |
2005年 | 307篇 |
2004年 | 263篇 |
2003年 | 271篇 |
2002年 | 277篇 |
2001年 | 381篇 |
2000年 | 331篇 |
1999年 | 316篇 |
1998年 | 246篇 |
1997年 | 217篇 |
1996年 | 245篇 |
1995年 | 225篇 |
1994年 | 228篇 |
1993年 | 197篇 |
1992年 | 222篇 |
1991年 | 246篇 |
1990年 | 218篇 |
1989年 | 182篇 |
1988年 | 205篇 |
1987年 | 190篇 |
1986年 | 151篇 |
1985年 | 191篇 |
1984年 | 198篇 |
1983年 | 173篇 |
1982年 | 137篇 |
1981年 | 104篇 |
1980年 | 104篇 |
1979年 | 129篇 |
1978年 | 97篇 |
1977年 | 89篇 |
1976年 | 64篇 |
1975年 | 69篇 |
1974年 | 70篇 |
排序方式: 共有10000条查询结果,搜索用时 828 毫秒
681.
682.
Sowmya Rajan S. Philip Morgan Kathleen Mullan Harris David Guilkey Sarah R. Hayford Karen Benjamin Guzzo 《Population research and policy review》2017,36(6):903-928
Having an unintended birth is strongly associated with the likelihood of having later unintended births. We use detailed longitudinal data from the Add Health Study (N = 8300) to investigate whether a host of measured sociodemographic, personality, and psychosocial characteristics select women into this “trajectory” of unintended childbearing. While some measured characteristics and aspects of the unfolding life course are related to unintended childbearing, explicitly modeling these effects does not greatly attenuate the association of an unintended birth with a subsequent one. Next, we statistically control for unmeasured time-invariant covariates that affect all birth intervals, and again find that the association of an unintended birth with subsequent ones remains strong. This persistent, strong association may be the direct result of experiencing an earlier unintended birth. We propose several mechanisms that might explain this strong association. 相似文献
683.
Chodziwadziwa W. Kabudula Brian Houle Mark A. Collinson Kathleen Kahn Stephen Tollman Samuel Clark 《Social indicators research》2017,133(3):1047-1073
Understanding the distribution of socioeconomic status (SES) and its temporal dynamics within a population is critical to ensure that policies and interventions adequately and equitably contribute to the well-being and life chances of all individuals. This study assesses the dynamics of SES in a typical rural South African setting over the period 2001–2013 using data on household assets from the Agincourt Health and Demographic Surveillance System. Three SES indices, an absolute index, principal component analysis index and multiple correspondence analysis index, are constructed from the household asset indicators. Relative distribution methods are then applied to the indices to assess changes over time in the distribution of SES with special focus on location and shape shifts. Results show that the proportion of households that own assets associated with greater modern wealth has substantially increased over time. In addition, relative distributions in all three indices show that the median SES index value has shifted up and the distribution has become less polarized and is converging towards the middle. However, the convergence is larger from the upper tail than from the lower tail, which suggests that the improvement in SES has been slower for poorer households. The results also show persistent ethnic differences in SES with households of former Mozambican refugees being at a disadvantage. From a methodological perspective, the study findings demonstrate the comparability of the easy-to-compute absolute index to other SES indices constructed using more advanced statistical techniques in assessing household SES. 相似文献
684.
Mark A. Hager Ph.D. 《Nonprofit management & leadership》2017,27(3):295-298
685.
Natale Canale Alessio Vieno Mark D. Griffiths Valeria Siciliano Arianna Cutilli Sabrina Molinaro 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2017,33(2):425-435
The present study examined the association between having older siblings who gamble and adolescent at-risk/problem gambling and how parents (i.e., parental knowledge of their whereabouts) and peers might moderate such effects. Data were drawn from the ESPAD®Italia2012 survey (European School Survey Project on Alcohol and Other Drugs) comprising a nationally representative Italian sample of adolescents. The analysis was carried out on a subsample of 10,063 Italian students aged 15–19 years (average age = 17.10; 55 % girls) who had at least one older sibling and who had gambled at some point in their lives. Respondents’ problem gambling severity, older gambler sibling, gambler peers, parental knowledge, and socio-demographic characteristics were individually assessed. Multinomial logistic regression analyses including two- and three-way interactions were conducted. The odds of being an at-risk/problem gambler were higher among high school students with older siblings that gambled and those with peers who gambled. Higher parental knowledge (of who the adolescent was with and where they were in their leisure time) was associated with lower rates of at-risk/problem gambling. There was also an interaction between gamblers with older siblings and parental knowledge. The combination of having siblings who gambled and a greater level of parental knowledge was associated with lower levels of problem gambling. The present study confirmed the occurrence of social risk processes (older siblings and peers who gambled) and demonstrated that gambling among older siblings and peers represents an important contextual factor for increased at-risk/problem gambling. However, parental knowledge appears to be sufficient to counterbalance the influence of older siblings. 相似文献
686.
Michael Auer Mark D. Griffiths 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2017,33(3):795-806
Many research findings in the gambling studies field rely on self-report data. A very small body of empirical research also suggests that when using self-report, players report their gambling losses inaccurately. The aim of the present study was to evaluate the differences between objective and subjective gambling spent data by comparing gambler’s actual behavioral tracking data with their self-report data over a 1-month period. A total of 17,742 Norwegian online gamblers were asked to participate in an online survey. Of those surveyed, 1335 gamblers answered questions relating to gambling expenditure that could be compared with their actual gambling behavior. The study found that the estimated loss self-reported by gamblers was correlated with the actual objective loss and that players with higher losses tended to have more difficulty estimating their gambling expenditure (i.e., players who spent more money gambling also appeared to have more trouble estimating their expenses accurately). Overall, the findings demonstrate that caution is warranted when using self-report data relating to amount of money spent gambling in any studies that are totally reliant on self-report data. 相似文献
687.
T. S. Jaisoorya K. V. Beena M. Beena K. Ellangovan K. Thennarassu Henrietta Bowden-Jones Vivek Benegal Sanju George 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2017,33(2):449-460
Studies from the West suggest that significant numbers of high school students gamble, despite it being illegal in this age group. To date, there have been no studies on the prevalence of gambling among senior high school and higher secondary school students in India. This study reports point prevalence of gambling and its psychosocial correlates among high school students in the State of Kerala, India. 5043 high school students in the age group 15–19 years, from 73 schools, were selected by cluster random sampling from the district of Ernakulam, Kerala, South India. They completed questionnaires that assessed gambling, substance use, psychological distress, suicidality, and symptoms of Attention Deficit Hyperactivity Disorder (ADHD). Of a total of 4989 completed questionnaires, 1400 (27.9 %) high school students reported to have ever gambled and 353 (7.1 %) were problem gamblers. Of those who had ever gambled, 25.2 % were problem gamblers. Sports betting (betting on cricket and football) was the most popular form of gambling followed by the lottery. Problem gamblers when compared with non-problem gamblers and non-gamblers were significantly more likely to be male, have academic failures, have higher rates of lifetime alcohol and tobacco use, psychological distress, suicidality, history of sexual abuse and higher ADHD symptom scores. Gambling among adolescents in India deserves greater attention, as one in four students who ever gambled was a problem gambler and because of its association with a range of psychosocial variables. 相似文献
688.
Mark A. Hager Ph.D. 《Nonprofit management & leadership》2017,28(2):149-153
689.
Adolescent Conflict Appraisals Moderate the Link Between Marital Conflict and Physiological Stress Reactivity
下载免费PDF全文
![点击此处可从《Journal of research on adolescence》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Rachel G. Lucas‐Thompson Erika S. Lunkenheimer Douglas A. Granger 《Journal of research on adolescence》2017,27(1):173-188
The goal of this study was to advance understanding of how adolescent conflict appraisals contribute uniquely, and in combination with interparental conflict behavior, to individual differences in adolescent physiological reactivity. Saliva samples were collected from 153 adolescents (52% female; ages 10–17 years) before and after the Trier Social Stress Test. Saliva was assayed for cortisol and alpha‐amylase. Results revealed interactive effects between marital conflict and conflict appraisals. For youth who appraised parental conflict negatively (particularly as threatening), negative marital conflict predicted dampened reactivity; for youth who appraised parental conflict less negatively, negative marital conflict predicted heightened reactivity. These findings support the notion that the family context and youth appraisals of family relationships are linked with individual differences in biological sensitivity to context. 相似文献
690.
Developmental Latent Patterns of Identification as Mostly Heterosexual Versus Lesbian,Gay, or Bisexual
下载免费PDF全文
![点击此处可从《Journal of research on adolescence》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Jerel P. Calzo Katherine E. Masyn S. Bryn Austin Hee‐Jin Jun Heather L. Corliss 《Journal of research on adolescence》2017,27(1):246-253
Scant research exists on the development of mostly heterosexual identity, the largest sexual orientation minority subgroup. We used longitudinal latent class analysis to characterize the patterns of identification with lesbian, gay, bisexual (LGB), or mostly heterosexual identities from ages 12 to 23 in 13,859 youth (57% female) in a U.S. national cohort. Three classes emerged: completely heterosexual (88.2%), mostly heterosexual (9.5%), and LGB (2.4%). LGB class youth generally identified with sexual minority identities by ages 12–17. In contrast, mostly heterosexual class youth identified with sexual minority identities gradually, with steady increases in endorsement starting at the age of 14. Developmental implications of these differential patterns are discussed. 相似文献