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   220篇
  免费   0篇
教育   135篇
科学研究   12篇
体育   36篇
文化理论   6篇
信息传播   31篇
  2021年   2篇
  2020年   2篇
  2019年   4篇
  2018年   13篇
  2017年   4篇
  2016年   9篇
  2015年   2篇
  2014年   6篇
  2013年   36篇
  2012年   9篇
  2011年   7篇
  2010年   7篇
  2009年   7篇
  2008年   11篇
  2007年   11篇
  2006年   6篇
  2005年   6篇
  2004年   3篇
  2003年   2篇
  2002年   9篇
  2001年   3篇
  2000年   2篇
  1999年   2篇
  1997年   2篇
  1995年   5篇
  1993年   3篇
  1992年   1篇
  1991年   3篇
  1990年   2篇
  1989年   2篇
  1988年   2篇
  1987年   1篇
  1985年   2篇
  1984年   5篇
  1983年   3篇
  1982年   1篇
  1981年   1篇
  1979年   3篇
  1977年   2篇
  1973年   1篇
  1968年   2篇
  1967年   2篇
  1966年   1篇
  1965年   1篇
  1964年   1篇
  1963年   2篇
  1959年   1篇
  1892年   3篇
  1885年   1篇
  1840年   1篇
排序方式: 共有220条查询结果,搜索用时 171 毫秒
81.
82.
The authors explore demand for cable services in individual households and find that the quality of over‐the‐air reception, interest in nonprogramming entertainment services, and service quality directly affect that demand. The study also explores demographic and behavioral differences in demand for basic and pay services and outlines their implications for cable systems operators.  相似文献   
83.
The author argues that cable industry is having increasingly negative impact on broadcast television as its power in both the programing and advertising markets increase. Cable system operaters are having increasing incentives to drop or refuse to add broadcast stations or to relocate them to less desirable channel locations as a means of improving their performance in the markets. The author warns that current trends could be harmful to many broadcast stations, but he is especially pessimistic about the future of independent UHF stations.  相似文献   
84.
This qualitative study highlighted student perspectives on barriers to success at a community college located in a south Texas city. The study examined barriers to student success, the knowledge that successful students possess to overcome the barriers, and the actions that successful students undertake to overcome the barriers. Padilla's (2004 Padilla , R. V. ( 1999 ). College student retention: Focus on success . Journal of College Student Retention , 1 ( 2 ), 131145 .[Crossref] [Google Scholar]) theoretical framework and methods for modeling student success provided the conceptual framework for the study. The data analysis resulted in the development of a local student success model and an implementation model for student services at the subject campus.  相似文献   
85.
We investigated whether ultraendurance runners in a 100-km run suffer a decrease of body mass and whether this loss consists of fat mass, skeletal muscle mass, or total body water. Male ultrarunners were measured pre- and postrace to determine body mass, fat mass, and skeletal muscle mass by using the anthropometric method. In addition, bioelectrical impedance analysis was used to determine total body water, and urinary (urinary specific gravity) and hematological parameters (hematocrit and plasma sodium) were measured in order to determine hydration status. Body mass decreased by 1.6 kg (p < .01), fat mass by 0.4 kg (p < .01), and skeletal muscle mass by 0.7 kg (p < .01), whereas total body water increased by 0.8 L (p < .05). Hematocrit and plasma sodium decreased significantly (p < .01), whereas plasma urea and urinary specific gravity (USG) increased significantly (p < .01). The decrease of 2.2% body mass and a USG of 1.020 refer to a minimal dehydration. Our athletes seem to have been relatively overhydrated (increase in total body water and plasma sodium) and dehydrated (decrease in body mass and increase in USG) during the race, as evidenced by the increased total body water and the fact that plasma sodium and hematocrit were lower postrace than prerace. The change of body mass was associated with the change of total body water (p < .05), and we presume the development of  相似文献   
86.
Abstract

The aim of this study was to assess the extent to which measures derived from the new FIFA referees’ fitness tests can be used to monitor a referee's match-related physical capacity. Match-analysis data were collected (Prozone®, Leeds, UK) from 17 soccer referees for 5.0 (s = 1.7) FA Premier League matches per referee during the first 4 months of the 2007–08 season. Physical match performance categories included total distance covered, high-intensity running distance (speed >5.5 m · s?1), and sprinting distance (>7.0 m · s?1). The two tests were a 6 × 40-m sprint test and a 150-m interval test. Heart rate demand was correlated with total match distance covered (r = ?0.70, P = 0.002) and high-intensity running (r = ?0.57, P = 0.018) in the interval test. The fastest 40-m sprint was related to total distance covered (r = ?0.69, P = 0.002), high-intensity running (r = ?0.76, P < 0.001), and sprinting distance (r = ?0.75, P = 0.001), while mean time for the 40-m sprints was related to total distance covered (r = ?0.70, P = 0.002), high-intensity running (r = ?0.77, P < 0.001), and sprinting distance (r = ?0.77, P < 0.001). The referees who recorded the best interval-test heart rate demand and fastest 40-m time produced the best physical match performances. However, only the sprint test and in particular the fastest 40-m time had appropriate construct validity for the physical assessment of soccer referees.  相似文献   
87.
In this study which was part of the DISUM-project, 224 ninth graders from 14 German classes from middle track schools (Realschule) were asked about their enjoyment, interest, value and self-efficacy expectations concerning three types of mathematical problems: intra-mathematical problems, word problems and modelling problems. Enjoyment, interest, value and self-efficacy were assessed before and after a ten-lesson teaching unit promoting modelling competency related to the topics “Pythagoras’ theorem” and “linear functions”. The study aimed to answer the following research questions: (1) Do students’ enjoyment, value, interest and self-efficacy expectations differ depending on the type of task? (2) Does the treatment of modelling problems in classroom instruction influence these variables? (3) Are there any differential effects for different ways of teaching modelling problems, including a “directive”, teacher-centred instruction and an “operative-strategic”, more student-centred instruction emphasising group work and strategic scaffolding by the teacher? The findings show that there were no differences in students’ enjoyment, interest, value and self-efficacy between the three types of tasks. However, teaching oriented towards modelling problems had positive effects on some of the student variables, with the student-centred teaching method producing the most beneficial effects.  相似文献   
88.
ABSTRACT

Systems’ thinking has become increasingly relevant not only in education for sustainable development but also in everyday life. Even if teachers know the dynamics and complexity of living systems in biology and geography, they might not be able to effectively explain it to students. Teachers need an understanding of systems and their behaviour (content knowledge), and they also need to know how systems thinking can be fostered in students (pedagogical content knowledge (PCK)). But the effective development of teachers’ professional knowledge in teaching systems thinking is empirically uncertain. From a larger study (SysThema) that investigated teaching systems thinking, this article reports the effects of the three different interventions (technical course, didactic course and mixed course) in student teachers’ PCK for teaching systems thinking. The results show that student teachers’ PCK for teaching systems thinking can be promoted in teacher education. The conclusion to be drawn from our findings is that a technically orientated course without didactical aspects seems to be less effective in fostering student teachers’ PCK for teaching systems thinking. The results inform educators in enhancing curricula of future academic track and non-academic track teacher education.  相似文献   
89.
At the university, each institute or chair can be seen as a small independent enterprise in respect of education and research. For this reason, the efficiency of management as well as the improvement of education and research within this unit is more and more at a premium. The students need a good working environment and the opportunity to gain and share information in order to carry out successful research and course work. This paper shows how education at a university semiconductor laboratory can be improved by using a content management system to build a knowledge management system. The structuring and implementation will be shown as well as students’ rating of it. The results support the conclusion that the knowledge base is a great step forward for improving education and research in a complex environment.  相似文献   
90.
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