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   928篇
  免费   14篇
  国内免费   1篇
教育   800篇
科学研究   20篇
各国文化   9篇
体育   25篇
文化理论   13篇
信息传播   76篇
  2022年   5篇
  2021年   8篇
  2020年   22篇
  2019年   26篇
  2018年   33篇
  2017年   25篇
  2016年   32篇
  2015年   19篇
  2014年   14篇
  2013年   244篇
  2012年   19篇
  2011年   22篇
  2010年   23篇
  2009年   26篇
  2008年   34篇
  2007年   17篇
  2006年   19篇
  2005年   27篇
  2004年   21篇
  2003年   15篇
  2002年   12篇
  2001年   14篇
  2000年   19篇
  1999年   8篇
  1998年   4篇
  1997年   20篇
  1996年   24篇
  1995年   13篇
  1994年   10篇
  1993年   14篇
  1992年   8篇
  1991年   6篇
  1990年   8篇
  1989年   11篇
  1988年   10篇
  1987年   5篇
  1986年   13篇
  1985年   15篇
  1984年   10篇
  1983年   11篇
  1982年   5篇
  1981年   9篇
  1980年   10篇
  1979年   5篇
  1978年   2篇
  1977年   5篇
  1976年   5篇
  1973年   2篇
  1972年   2篇
  1923年   2篇
排序方式: 共有943条查询结果,搜索用时 15 毫秒
21.
22.
23.
Background:Osteoarthritis is one of the leading causes of pain and disability worldwide,and a large percentage of patients with osteoarthritis are individuals who are also obese.In recent years,a series of animal models have demonstrated that obesity-inducing diets can result in synovial joint damage(both with and without the superimposition of trauma),which may be related to changes in percentage of body fat and a series of low-level systemic inflammatory mediators.Of note,there is a disparity between whether the dietary challenges commence at weaning,representing a weanling onset,or at skeletal maturity,representing an adult onset of obesity.We wished to evaluate the effect ofthe dietary exposure time and the age at which animals are exposed to a high-fat and high-sucrose(HFS) diet to determine whether these factors may result in disparate outcomes,as there is evidence suggesting that these factors result in differential metabolic disturbances.Based on dietary exposure time,we hypothesized that rats fed an HFS diet for 14 weeks from weaning(HFS Weanling) would demonstrate an increase in knee joint damage scores,whereas rats exposed to the HFS diet for 4 weeks,starting at 12 weeks of age(HFS Adult) and rats exposed to a standard chow diet(Chow)would not display an increase in knee joint damage scores.Methods:Male Sprague-Dawley rats were fed either an HFS diet for 14 weeks from weaning(HFS Weanling) or an HFS diet for 4 weeks,starting at 12 weeks of age(HFS Adult).At sacrifice,joints were scored using the modified Mankin Criteria,and serum was analyzed for a defined subset of inflammatory markers(Interleukin-6,leptin,monocyte chemoattractant protein-1,and tumor necrosis factorα).Results:When the HFS Weanling and HFS Adult groups were compared,both groups had a similar percent of body fat,although the HFS Weanling group had a significantly greater body mass than the HFS Adult group.The HFS Weanling and HFS Adult animals had a significant increase in body mass and percentage of body fat when compared to the Chow group.Although knee joint damage scores were low in all 3 groups,we found,contrary to our hypothesis,that the HFS Adult group had statistically significant greater knee joint damage scores than the Chow and HFS Weanling groups.Furthermore,we observed that the HFS Weanling group did not have significant differences in knee joint damage scores relative to the Chow group.Conclusion:These findings indicate that the HFS Weanling animals were better able to cope with the dietary challenge of an HFS diet than the HFS Adult group.Interestingly,when assessing various serum proinflammatory markers,no significant differences were detected between the HTS Adult and HFS Weanling groups.Although details regarding the mechanisms underlying an increase in knee joint damage scores in the HFS Adult group remain to be elucidated,these findings indicate that dietary exposure time maybe less important than the age at which an HFS diet is introduced.Moreover,increases in serum proinflammatory mediators do not appear to be directly linked to knee joint damage scores in the HFS Weanling group animals but may be partially responsible for the observed knee joint damage in the adults over the very short time of exposure to the HFS diet.  相似文献   
24.
25.
26.
An understanding of the uses of meta-cognition provides a powerful tool toward developing quality and efficiency in task learning and performance. Metacognition is the executive controller of cognitive processes responsible both for self regulated learning and work performance outcomes. Comprehension monitoring and motivation are two prime components of metacognition which are responsible for commitment to, and definition of, goals, monitoring progress toward goals, and activating the appropriate thinking skills to achieve goals. Specific thinking skill categories of attention, organization, and elaboration are described with examples of how specific techniques in each category can optimize learning and job performance. Research on training of metacognitive skills through both detached and embedded skill-development programs is reviewed. In addition, ways to compensate for metacognitive skills when training is not cost-effective are described. The relationship between metacognitive skills and effective management of work performance is stressed.  相似文献   
27.
28.
Abstract

We designed a survey to assess whether 40 randomly selected individuals, equally divided across two settings (ICF/MR, minigroup home), differed in the amounts of time spent in the community, the people with whom unstructured activities were performed, and the choice maker of unstructured activities performed in the community or in homes. Time spent in unstructured activities was divided into four subsets: performed by self, with a peer, with staff, and with family. An analysis of variance (ANOVA) indicated that individuals living in ICF/MR homes spent more time in the community with staff and made fewer choices of their unstructured activities than those living in minigroup homes. The analyses also indicated that for those retaining their own legal guardianship and living in ICF/MR homes continued to spend less time in activities they chose themselves. Of those variables reaching statistical significance, we questioned meaningful interpretations based on alternative interpretations of the raw data.  相似文献   
29.
30.
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