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   4954篇
  免费   70篇
  国内免费   20篇
教育   3343篇
科学研究   635篇
各国文化   29篇
体育   380篇
综合类   6篇
文化理论   33篇
信息传播   618篇
  2022年   37篇
  2021年   45篇
  2020年   85篇
  2019年   120篇
  2018年   155篇
  2017年   192篇
  2016年   155篇
  2015年   116篇
  2014年   157篇
  2013年   780篇
  2012年   131篇
  2011年   136篇
  2010年   122篇
  2009年   102篇
  2008年   113篇
  2007年   134篇
  2006年   103篇
  2005年   72篇
  2004年   86篇
  2003年   79篇
  2002年   62篇
  2001年   104篇
  2000年   130篇
  1999年   89篇
  1998年   72篇
  1997年   63篇
  1996年   62篇
  1995年   42篇
  1994年   45篇
  1993年   34篇
  1992年   76篇
  1991年   69篇
  1990年   60篇
  1989年   62篇
  1988年   75篇
  1987年   58篇
  1986年   78篇
  1985年   70篇
  1984年   55篇
  1983年   69篇
  1982年   53篇
  1981年   40篇
  1980年   30篇
  1979年   52篇
  1978年   49篇
  1977年   37篇
  1976年   41篇
  1975年   31篇
  1974年   33篇
  1973年   33篇
排序方式: 共有5044条查询结果,搜索用时 0 毫秒
121.
Path analyses revealed that one's tendency to conceal distressing information, social support, psychological distress, and attitudes toward seeking help predicted intended use of counseling services for college students who had and had not previously been in counseling. Prospective analyses revealed that attitudes toward seeking help predicted actual use of the campus counseling center. These findings have implications for campus outreach programs and in‐session work with clients.  相似文献   
122.
Electrospinning, a flexible jet-based fiber, scaffold, and membrane fabrication approach, has been elucidated as having significance to the heath sciences. Its capabilities have been most impressive as it possesses the ability to spin composite fibers ranging from the nanometer to the micrometer scale. Nonetheless, electrospinning has limitations and hazards, negating its wider exploration, for example, the inability to handle highly conducting suspensions, to its hazardous high voltage. Hence, to date electrospinning has undergone an exhaustive research regime to a point of cliché. Thus, in the work reported herein we unveil a competing technique to electrospinning, which has overcome the above limitations and hazards yet comparable in capabilities. The fiber preparation approach unearthed herein is referred to as “pressure driven spinning (PDS).” The driving mechanism exploited in this fiber spinning process is the pressurized by-pass flow. This mechanism allows the drawing of either micro- or nanosized fibers while processing polymeric suspensions containing a wide range of advanced materials spanning structural, functional, and biological entities. Similar to electrospinning if the collection time of these continuous formed fibers is varied, composite scaffolds and membranes are generated. In keeping with our interests, multicompositional structural entities such as these could have several applications in biology and medicine, for example, ranging from the development of three-dimensional cultures (including disease models) to the development of synthetic tissues and organ structures to advanced approaches for controlled and targeted therapeutics.  相似文献   
123.
Educational Assessment, Evaluation and Accountability - Promoting success for all students is the driving force to develop and implement sound teacher evaluation systems. As Stronge suggests,...  相似文献   
124.
125.
In Experiment 1, two groups of female rats were trained in a triangular pool to find a hidden platform whose location was defined in terms of a single a landmark, a cylinder outside the pool. For one group, the landmark had only a single pattern (i.e., it looked the same when approached from any direction), while for the other, the landmark contained four different patterns (i.e., it looked different when approached from different directions). The first group learned to swim to the platform more rapidly than the second. Experiment 2 confirmed this difference when female rats were trained in a circular pool but found that male rats learned equally rapidly (and as rapidly as females trained with the single-pattern landmark) with both landmarks. This second finding was confirmed in Experiment 3. Finally, in Experiment 4a and 4b, male and female rats were trained either with the same, single-pattern landmark on all trials or with a different landmark each day. Males learned equally rapidly (and as rapidly as females trained with the unchanged landmark) whether the landmark changed or not. We conclude that male and female rats learn rather different things about the landmark that signals the location of the platform.  相似文献   
126.
Working memory training improves children's cognitive performance on untrained tasks; however, little is known about the underlying neural mechanisms. This was investigated in 32 typically developing children aged 10–14 years (19 girls and 13 boys) using a randomized controlled design and multi-modal magnetic resonance imaging (Devon, UK; 2015–2016). Training improved working memory performance and increased intrinsic functional connectivity between the bilateral intraparietal sulci. Furthermore, improvements in working memory were associated with greater recruitment of the left middle frontal gyrus on a complex span task. Repeated engagement of fronto-parietal regions during training may increase their activity and functional connectivity over time, affording greater working memory performance. The plausibility of generalizable cognitive benefits from a neurobiological perspective and implications for neurodevelopmental theory are discussed.  相似文献   
127.
Previous research has found that children engage in Level 2 visual perspective-taking, that is, the understanding that others may see things in a different way, between 4 and 5 years of age (e.g., J. H. Flavell, B. A. Everett, K. Croft, & E. R. Flavell, 1981). This ability was reexamined in 36-month-olds using color filters. In Experiment 1 (N = 24), children had to recognize how an object looked to an adult when she saw it through a color filter. In Experiment 2 (N = 24), a novel production test was applied. Results of both studies show that 36-month-olds know how an object looks to another person. The discussion focuses on the psychological requirements of visual perspective-taking and its relation to other "theory of mind" abilities, such as the distinction between appearance and reality and understanding false belief.  相似文献   
128.
The Student Counselling Needs Scale (SCNS) was administered to 867 participants recruited from high schools in Kenya. The data were analyzed using exploratory factor analysis yielding five factors: human relationships, career development, self development, social values, and learning skills were assessed. The findings highlighted the importance of using assessment instruments to identify students’ counselling needs in Kenya.  相似文献   
129.
This study examined the relationship between adolescents’ attachment style and their decision to enter mentoring relationships. The participants were 569 Greek Cypriot high school students. It was found that adolescents who have a mentor are more secure in their attachment than those who do not. Girls with low scores in secure attachment do not enter easily into mentoring relationships. Older adolescents are more anxious in their attachments, probably because they can better appreciate the possible difficulties if something goes wrong; thus, they are more reluctant to take the risk of starting a mentoring relationship than younger students. Furthermore, secure attachment was found to be positively correlated to the perceived impact of the whole experience: the more secure the attachment, the stronger the mentoring bond seems to be.  相似文献   
130.
One of the great strengths of Jim Kaput’s research program was his relentless drive towards scaling up his innovative approach to teaching the mathematics of change and variation. The SimCalc mission, “democratizing access to the mathematics of change,” was enacted by deliberate efforts to reach an increasing number of teachers and students each year. Further, Kaput asked: What can we learn from research at the next level of scale (e.g., beyond a few classrooms at a time) that we cannot learn from other sources? In this article, we develop an argument that scaling up research can contribute important new knowledge by focusing researchers’ attention on the robustness of an innovation when used by varied students, teachers, classrooms, schools, and regions. The concept of robustness requires additional discipline both in the design process and in the conduct of valid research. By examining a progression of three studies in the Scaling Up SimCalc program, we articulate how scaling up research can contribute to designing for and evaluating robustness.  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