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   594篇
  免费   32篇
管理学   39篇
民族学   4篇
人口学   73篇
丛书文集   5篇
理论方法论   75篇
综合类   10篇
社会学   387篇
统计学   33篇
  2023年   8篇
  2022年   3篇
  2021年   5篇
  2020年   10篇
  2019年   16篇
  2018年   18篇
  2017年   30篇
  2016年   21篇
  2015年   29篇
  2014年   19篇
  2013年   90篇
  2012年   31篇
  2011年   28篇
  2010年   10篇
  2009年   12篇
  2008年   24篇
  2007年   31篇
  2006年   21篇
  2005年   20篇
  2004年   17篇
  2003年   11篇
  2002年   15篇
  2001年   10篇
  2000年   20篇
  1999年   16篇
  1998年   11篇
  1997年   11篇
  1996年   8篇
  1995年   5篇
  1994年   5篇
  1993年   6篇
  1992年   11篇
  1991年   2篇
  1990年   8篇
  1989年   7篇
  1988年   8篇
  1987年   3篇
  1986年   2篇
  1985年   5篇
  1984年   1篇
  1983年   2篇
  1982年   2篇
  1980年   5篇
  1978年   2篇
  1977年   2篇
  1975年   1篇
  1973年   1篇
  1972年   1篇
  1968年   1篇
  1966年   1篇
排序方式: 共有626条查询结果,搜索用时 15 毫秒
621.

UK official statistics on income distribution have incorporated top-income adjustments to household survey data since 1992. This article reviews the work undertaken by the Department for Work and Pensions and the Office for National Statistics, and the academic research that influenced them, and reflects on the lessons to learn from the UK experience.

  相似文献   
622.
This study examined the development of prosocial charity donations and neural activity in the ventral striatum when gaining rewards for self and for charity. Participants 10–22 years (95% European heritage) participated in three annual behavioral-fMRI waves (T1: n = 160, T2: n = 167, T3: n = 175). Behaviorally, donations to charity as measured with an economic Dictator Game increased with age. Perspective taking also increased with age. In contrast, self-gain and charity-gain enjoyment decreased with age. Ventral striatum activity was higher for rewards for self than for charity, but this difference decreased during adolescence. Latent growth curve models revealed that higher donations were associated with a smaller difference between ventral striatum activation for self and charity. These findings show longitudinal brain–donations associations in adolescence.  相似文献   
623.
We examined variability and change in adolescents' prosocial behaviors directed to peers and friends across four time scales: two-years, one-year, two-monthly, and daily. Data from three longitudinal datasets with a total of 569 adolescents (55.7% girl, Mage = 15.23, SD = 3.90) were included. The overall time-related stability of prosocial behavior across time scales was moderate to excellent. Variability did not differ between early (age 10–15) and late (age 16–21) adolescence, but late adolescence was associated with higher mean levels of prosociality. Finally, results indicated that prosocial behaviors measured over longer periods (i.e., two-years and one-year) were positively associated with cognitive processes (perspective taking), whereas prosocial behaviors measured over shorter periods (i.e., two-monthly) were positively associated with affective processes (empathy).  相似文献   
624.
Socioeconomic vulnerabilities put adolescents at risk for mental wellbeing issues, also in times of a pandemic. In the present longitudinal online survey study, we explored changes in mental wellbeing (i.e., mood and life satisfaction) during the COVID-19 pandemic. Second, we examined how socioeconomic hardship in online home schooling predicted adolescents’ mental wellbeing 1 year later. Third, we tested whether this relation was mediated by feelings of uncertainty about the future. Fourth, we tested whether this relation was moderated (in terms of a protective factor) by self-efficacy. In total, 177 Dutch-speaking adolescents aged 10–18 years (Mage = 15.64, SDage = 1.72, 79% females) participated in all three 6-month separated waves (T1 = May 2020, T2 = November 2020, and T3 = May 2021). Mood results demonstrated that feelings of vigor decreased between T1 and T2, and feelings of tension and depression increased between T1, T2, and T3. Socioeconomic hardship in online home schooling in the early phase of the pandemic was negatively associated with both baseline mental wellbeing and 1 year later. Socioeconomic hardship at T1 predicted higher feelings of future uncertainty at T2, and higher levels of future uncertainty were associated with lower feelings of vigor, and higher feelings of tension and depression at T3. However, we found no evidence for mediation or moderation effects. In conclusion, the present findings illustrate the complexity of disentangling the adverse effects of socioeconomic hardship on adolescent mental wellbeing.  相似文献   
625.
In Ireland, little is known about mothers and infants where child welfare and protection concerns arise during the perinatal period. This study explores, for the first time, perinatal child protection. A retrospective audit was carried out of a large maternity hospital's medical social work, neonatal and psychiatric files for a five-year period from 2016 to 2020. The study identified 99 children, born to 86 mothers, who were either subject to a child protection conference; placed for adoption; discharged to someone other than the mother; or discharged home under supervision. The study found that two-thirds of the children were discharged to their mother's care. When compared to national data, the health indicators for this cohort of mothers and children painted a grim picture. The maternal profiles identified high prevalence of mental health and addiction difficulties and domestic violence. The study found evidence of supports provided to the mothers to enable them to care for their infants while they remained in the hospital and during an initial discharge from hospital. However, a significant number of the mothers were not caring for their children when viewed across a longer time frame. Dedicated multi-disciplinary clinics and improved data systems were identified as of importance.  相似文献   
626.
Mixed model repeated measures (MMRM) is the most common analysis approach used in clinical trials for Alzheimer's disease and other progressive diseases measured with continuous outcomes over time. The model treats time as a categorical variable, which allows an unconstrained estimate of the mean for each study visit in each randomized group. Categorizing time in this way can be problematic when assessments occur off-schedule, as including off-schedule visits can induce bias, and excluding them ignores valuable information and violates the intention to treat principle. This problem has been exacerbated by clinical trial visits which have been delayed due to the COVID19 pandemic. As an alternative to MMRM, we propose a constrained longitudinal data analysis with natural cubic splines that treats time as continuous and uses test version effects to model the mean over time. Compared to categorical-time models like MMRM and models that assume a proportional treatment effect, the spline model is shown to be more parsimonious and precise in real clinical trial datasets, and has better power and Type I error in a variety of simulation scenarios.  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