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   32918篇
  免费   492篇
  国内免费   45篇
教育   23153篇
科学研究   3328篇
各国文化   550篇
体育   2412篇
综合类   48篇
文化理论   348篇
信息传播   3616篇
  2022年   160篇
  2021年   327篇
  2020年   491篇
  2019年   709篇
  2018年   1499篇
  2017年   1583篇
  2016年   1329篇
  2015年   620篇
  2014年   781篇
  2013年   5792篇
  2012年   843篇
  2011年   1058篇
  2010年   873篇
  2009年   752篇
  2008年   905篇
  2007年   942篇
  2006年   608篇
  2005年   599篇
  2004年   639篇
  2003年   488篇
  2002年   487篇
  2001年   521篇
  2000年   517篇
  1999年   495篇
  1998年   252篇
  1997年   284篇
  1996年   293篇
  1995年   252篇
  1994年   256篇
  1993年   239篇
  1992年   398篇
  1991年   399篇
  1990年   435篇
  1989年   411篇
  1988年   368篇
  1987年   316篇
  1986年   329篇
  1985年   421篇
  1984年   340篇
  1983年   314篇
  1982年   249篇
  1981年   234篇
  1980年   220篇
  1979年   326篇
  1978年   256篇
  1977年   240篇
  1976年   213篇
  1975年   171篇
  1974年   186篇
  1973年   195篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
In this paper, the authors discuss their grounded research carried out with teachers about the wellbeing of teachers. They explore the importance of making the concept of wellbeing more intimate and consider hedonic and eudaimonic ways of looking at wellbeing. They present a model of layered reflection which illuminates key factors that have an impact on the wellbeing of teachers.  相似文献   
2.
ABSTRACT

Distal-to-proximal redistribution of joint work occurs following exhaustive running in recreational but not competitive runners but the influence of a submaximal run on joint work is unknown. The purpose of this study was to assess if a long submaximal run produces a distal-to-proximal redistribution of positive joint work in well-trained runners. Thirteen rearfoot striking male runners (weekly distance: 72.6 ± 21.2 km) completed five running trials while three-dimensional kinematic and ground reaction force data were collected before and after a long submaximal treadmill run (19 ± 6 km). Joint kinetics were calculated from these data and percent contributions of joint work relative to total lower limb joint work were computed. Moderate reductions in absolute negative ankle work (p = 0.045, Cohen’s d = 0.31), peak plantarflexor torque (p = 0.004, d = 0.34) and, peak negative ankle power (p = 0.005, d = 0.32) were observed following the long run. Positive ankle, knee and hip joint work were unchanged (p < 0.05) following the long run. These findings suggest no proximal shift in positive joint work in well-trained runners after a prolonged run. Runner population, running pace, distance, and relative intensity should be considered when examining changes in joint work following prolonged running.  相似文献   
3.
This study identified social network profiles among children, determined whether profiles vary across sociodemographic characteristics, and investigated links between childhood profiles and depressive symptomology using three waves of data spanning 23 years (Wave 1, 1992 Metro-Detroit representative sample: n = 193, ages 8–12). Latent profile analysis revealed three profiles: Close Family (22%), Varied Family (57%), Friend and Family (21%). White children were more likely than Black children to be in the Friend and Family profile. Children in the Close Family profile reported the lowest levels of depressive symptomology in childhood, but exhibited the steepest increase over time. Findings suggest that close, family centric networks are protective in childhood, but less so as children develop into adulthood, highlighting the importance of considering developmental perspectives.  相似文献   
4.
Grit has been defined as passionate perseverance toward long-term challenging goals and it is associated with various positive outcomes for youth, including academic achievement. However, less is known about these associations for the two facets of grit (i.e., perseverance of effort, consistency of interest) and few studies have examined the link between grit and perceived social support. The present study examined the group-level demographic differences (i.e., gender, grade, socioeconomic status, and special education status) of grit in a high school sample (N = 1,077). In addition, direct associations between grit and perceived social support from multiple sources (i.e., teacher, classmate, parent) were examined, as well as a potential enhancing effect of social support as a moderator of the relation between grit and academic achievement. Results indicated positive associations among grit and its facets with social support from parents and classmates. Furthermore, the positive relation between grit and achievement was stronger for students reporting high social support from teachers, but not other sources (i.e., classmates, parents). Practical and theoretical implications for promoting student success are discussed.  相似文献   
5.
As the research base for school crisis intervention and prevention expands, the need for well-developed tools to assess school readiness in the event of a crisis increases. This paper describes how the Comprehensive Crisis Plan Checklist (CCPC) was updated to reflect advances in crisis management and crisis planning. An extensive literature search and pilot study were used to refine existing items and create new items for the checklist. The Comprehensive Crisis Plan Checklist, 2nd Edition (CCPC-2) has 102 items separated into three sections: prevention, intervention, and postvention. The CCPC-2 can be used by crisis teams to create new crisis plans or evaluate existing ones. Users are encouraged to carefully consider the inclusion of all items and articulate why individual items are not necessarily based on their specific needs. The CCPC-2 was given to 10 pairs of raters to evaluate school-based crisis plans; average interrater reliability was 89.04%. Discussion focuses on item analysis and how to use the checklist within a school setting.  相似文献   
6.
One of the most widely used solutions to fix and preserve organic tissues is formaldehyde, despite reservations regarding its toxicity and the fact that formaldehyde-embalmed bodies lose their original characteristics. Anatomy laboratories have been replacing formaldehyde with solutions that retain the characteristics of fresh tissue. For this purpose, alternative solutions with a very low concentration of formaldehyde or without any formaldehyde have been analyzed. The objective of this study was to compare biometry, coloration, haptic properties, and bacterial load on animal specimens (pig kidneys) embalmed with formaldehyde, and with Chilean Conservative Fixative Solution with and without formaldehyde (formaldehyde chCFS and formaldehyde-free chCFS). Also, the perception of health and biological science students toward specimens treated with different solutions was assessed. The results indicated that there were no significant differences in specimens’ retraction, or bacterial load. Students showed a preference for organs embalmed in formaldehyde chCFS and formaldehyde-free chCFS; indicating that with these treatments they could better visualize structures and that the prosections had greater flexibility and the colors were more similar to those of fresh tissue. Additionally, students recommended the material embalmed in formaldehyde chCFS and formaldehyde-free chCFS for anatomy learning. In contrast, students indicated that formaldehyde-fixation negatively affected their practical experience. In conclusion, embalming with formaldehyde chCFS or formaldehyde-free chCFS provides an advantageous practical experience over the use of formaldehyde and may be an alternative to replace the use of formaldehyde in anatomy laboratories.  相似文献   
7.
This article presents a pedagogical approach for disrupting epistemic injustice. In it, A. C. Nikolaidis first demonstrates that different forms of epistemic injustice — testimonial, hermeneutical, and contributory — are the result of limited or distorted conceptual resources and then argues that concept proliferation can be a promising educational means for overcoming such limitations and distortions. Concept proliferation involves a combination of increasing exposure to diverse, especially marginalized, concepts and providing students with necessary critical tools for questioning harmful and erroneous concepts. Concept proliferation is beneficial for both individual students and society at large. It liberates students from the confines of harmful concepts that limit their self-understanding, but also provides them with skills necessary to challenge hegemonic concepts that distort collective (social) understanding and contribute to epistemic and systemic injustice.  相似文献   
8.
9.
Despite an increase in the use of technology in undergraduate anatomy education, and the rising popularity of online anatomy courses at community colleges in the United States, there have been no reports on the efficacy of augmented reality on anatomy education in this population. The purpose of this study was to test the hypothesis that augmented reality is an effective and engaging tool for learning anatomy in community college students. Participants recruited from Cuyahoga Community College (Cleveland, OH) studied skull anatomy using either traditional tools (i.e., textbook and plastic skull model) or an augmented reality head-mounted display with an interactive virtual skull application. Comparison of knowledge before and following the study period revealed that augmented reality was an effective tool for learning skull anatomy: pre-quiz = 32.7% (± 25.2); mean (± SD), post-quiz = 61.8% (± 19.5); n = 15; t(28) = 3.53; P = 0.001. The traditional tools were equally effective: pre-quiz = 44.9 % (± 18.6), post-quiz = 67.9 % (± 17.3); n = 17; t(32) = 3.73; P = 0.0007. Students rated the augmented reality device as 9.6 (± 1.0); mean (± SD) when asked if it fit the statement “fun to use” on a semantic differential scale from 1 (poor) to 10 (excellent). In conclusion, this study found that augmented reality is an effective and engaging tool for the instruction of skull anatomy at a community college.  相似文献   
10.
ABSTRACT

This study aimed to examine the effects of two jump squat (JS) training programs involving different loading ranges in under-20 soccer players during a preseason period. Twenty-three elite young soccer players performed sprint speed (at 5-, 10-, and 20-m), change-of-direction (COD) speed, JS peak-power (PP), and countermovement jump (CMJ) tests pre and post four weeks of training. Athletes were pair-matched in two groups according to their optimum power loads (OPL) as follows: lower than OPL (LOPL; athletes who trained at a load 20% lower than the OPL) and higher than OPL (HOPL; athletes who trained at a load 20% higher than the OPL). Magnitude-based inferences were used to compare pre- and post-training measures. Meaningful increases in the PP JS were observed for both groups. Likely and possible improvements were observed in the 5- and 10-m sprint velocity in the LOPL group. Meanwhile, possible and likely improvements were observed in the CMJ, 5- and 10-m sprint velocity, and COD speed in the HOPL group. Overall, both training schemes induced positive changes in athletic performance. Soccer coaches and sport scientists can implement the JS OPL-based training schemes presented here, either separately or combined, to improve the physical performance of youth soccer players.  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