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   1754篇
  免费   107篇
  2024年   4篇
  2023年   29篇
  2022年   21篇
  2021年   35篇
  2020年   54篇
  2019年   63篇
  2018年   104篇
  2017年   91篇
  2016年   106篇
  2015年   59篇
  2014年   62篇
  2013年   200篇
  2012年   125篇
  2011年   142篇
  2010年   89篇
  2009年   33篇
  2008年   110篇
  2007年   99篇
  2006年   99篇
  2005年   62篇
  2004年   39篇
  2003年   42篇
  2002年   33篇
  2001年   9篇
  2000年   27篇
  1999年   16篇
  1998年   9篇
  1997年   7篇
  1996年   10篇
  1995年   4篇
  1994年   7篇
  1993年   4篇
  1992年   6篇
  1991年   8篇
  1990年   4篇
  1989年   5篇
  1988年   4篇
  1987年   5篇
  1986年   4篇
  1985年   4篇
  1984年   2篇
  1983年   5篇
  1978年   2篇
  1974年   2篇
  1971年   2篇
  1969年   2篇
  1967年   2篇
  1965年   1篇
  1962年   1篇
  1957年   1篇
排序方式: 共有1861条查询结果,搜索用时 15 毫秒
221.
This article discusses the ethics of knowledge production (KP) from a cultural point of view, in contrast with the more usual emphasis on the ethical issues facing individuals involved in KP. Here, the emphasis is on the cultural environment within which individuals, groups and institutions perform KP. A principal purpose is to suggest ways in which reliable scientific knowledge could be produced more efficiently. The distinction between ethical hazard and (un)ethical behaviour is noted. Ethical hazards cannot be eliminated but they can be reduced if the cultural ambience is suitable. The main suggestions for reducing ethical hazards in KP relate to the review process. It is argued that some defects of the current, largely anonymous, review process could be ameliorated by a process of comprehensive, open and ongoing review (COOR). This includes partial professionalisation of the work of reviewing. Review at several stages is a vital part of the long filtering that incorporates some claims into the canon of reliable knowledge. The review process would be an acknowledged and explicit part of KP—a respected, public and rewarded activity. COOR would be expensive but cost-effective. The costs should be built explicitly into research culture. Finally, the considerations about a more ‘KP friendly’ culture lead to advocacy of a ‘long-term, short-term’ synthesis; that is, of the synthesis of long-term vision, such as a more cooperative and less competitive culture, with incremental changes which may be implemented in the short term.  相似文献   
222.
The main goal of the current study was to investigate sex differences in the relationship between the level of trauma symptoms appearing in posttraumatic stress disorder (PTSD) and intensity of pain in a sample of 300 Polish patients suffering from chronic pain, specifically rheumatoid arthritis and lower back pain. We also focused on participants’ body image with body esteem as a mediator. To assess the intensity of pain among participants, we used the Numerical Rating Scale. The level of trauma symptoms was assessed with the PTSD Factorial Version Inventory. To measure body image among participants, we used the Body Esteem Scale. The results of our study suggest that trauma symptoms and body image dimensions were significant predictors of pain intensity among men suffering from chronic pain. Moreover, trauma symptoms and age were significant predictors of pain intensity among women suffering from chronic pain. Finally, we demonstrated that sex differentiates the reaction to chronic pain.  相似文献   
223.
224.
We exploit the cross-country differences in economic freedom to examine the link between the quality of institutions and subjective well-being. Using Veenhoven’s happiness dataset, the evidence suggests countries with better economic institutions and higher level of economic freedom, captured by the security of property rights, open markets and more limited government, are significantly more likely to experience greater subjective well-being after controlling for structural confounders of national subjective well-being such as income, unemployment, inequality, social capital and life satisfaction. The effect of institutions on cross-national happiness is both significant and robust to different model specifications, estimation techniques and possible sources of endogeneity. Furthermore, our panel data analysis reveals that over time higher levels of economic freedom are associated with decreasing subjective well-being after controlling for state dependence and income.  相似文献   
225.
The structure of affective well-being and the relationship between positive affect (PA) and negative affect (NA) have rarely been examined among adolescents. The aim of the present research was to investigate the question of bipolarity versus independence of PA and NA as measured by the PANAS across three studies in adolescent samples. The results of Study 1 (N = 1038) showed that a two-factor structure of the PANAS, with correlated PA and NA and allowed correlated errors between similarly worded items provided the best fit to data. Study 2 included three independent samples (total N = 1071), and showed that PA and NA differed in terms of their relationship to various well-being indicators. Study 3 (N = 482) tested the predictive validity of PA and NA in a 5 month follow-up design, and showed that both PA and NA had independent predictive benefits for depression, risky behaviors and life satisfaction, and that PA had no unique role in the prediction of stress and anxiety, while NA had no unique role in the prediction of academic achievement. The results of the present research provided strong support for the relative independence of PA and NA as measured by the PANAS among adolescents.  相似文献   
226.
This paper studies the economic effect of immigration on native working conditions, focusing on the impact of the inflow of immigrant labour on occupational mobility among native workers. Basing on a gender-segmented labour market, we propose an extension of the model presented by Peri and Sparber American Economic Journal: Applied Economics, 1(3), 135-169, (2009). The model controls for gender and time in order to check for potential differences in immigration effects associated with gender or immigrant length of residence. This research reveals the existence of such differences, by showing that female immigrant inflow has a greater positive short-term impact on occupational mobility among female unskilled native workers. In addition, the long-term study discloses a slight occupational assimilation of male immigrants towards employment patterns of male native workers and a permanent confinement of female immigrants in a few “niche jobs”.  相似文献   
227.
Accepting disruption as an inevitable occurrence in life, five nurse-teacher-researchers explore their experience with being disruptive/being disrupted. Reflection on the all-encompassing embodied experience of disruption takes us through a process of exploration and meaning-making. We pause to show what it is like to be in-between the known and unknown in creating a life in academia through stories. Plotlines such as being in-between family and work; transplanted outsider seeking a sense of belonging; going into the chaos while feeling invisible; and self-induced disruption in response to loss illuminate our reflection. The metaphor of the breathturn allows us to reconstruct our experience and to discern possibilities beyond the usual negative connotations.  相似文献   
228.
Early math skills are determined by higher cognitive processes that are particularly important for acquiring and developing skills during a child's early education. Such processes could be a critical target for identifying students at risk for math learning difficulties. Few studies have considered the use of a structural equation method to rationalize these relations. Participating in this study were 207 preschool students ages 59 to 72 months, 108 boys and 99 girls. Performance with respect to early math skills, early literacy, general intelligence, working memory, and short‐term memory was assessed. A structural equation model explaining 64.3% of the variance in early math skills was applied. Early literacy exhibited the highest statistical significance (β = 0.443, < 0.05), followed by intelligence (β = 0.286, < 0.05), working memory (β = 0.220, < 0.05), and short‐term memory (β = 0.213, < 0.05). Correlations between the independent variables were also significant (< 0.05). According to the results, cognitive variables should be included in remedial intervention programs.  相似文献   
229.
230.
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