全文获取类型
| 收费全文 | 1992篇 |
| 免费 | 33篇 |
| 国内免费 | 36篇 |
专业分类
| 教育 | 976篇 |
| 科学研究 | 154篇 |
| 体育 | 614篇 |
| 综合类 | 292篇 |
| 信息传播 | 25篇 |
出版年
| 2025年 | 3篇 |
| 2024年 | 8篇 |
| 2023年 | 19篇 |
| 2022年 | 24篇 |
| 2021年 | 27篇 |
| 2020年 | 44篇 |
| 2019年 | 43篇 |
| 2018年 | 30篇 |
| 2017年 | 32篇 |
| 2016年 | 32篇 |
| 2015年 | 48篇 |
| 2014年 | 110篇 |
| 2013年 | 140篇 |
| 2012年 | 137篇 |
| 2011年 | 126篇 |
| 2010年 | 84篇 |
| 2009年 | 108篇 |
| 2008年 | 108篇 |
| 2007年 | 129篇 |
| 2006年 | 134篇 |
| 2005年 | 103篇 |
| 2004年 | 95篇 |
| 2003年 | 99篇 |
| 2002年 | 62篇 |
| 2001年 | 81篇 |
| 2000年 | 55篇 |
| 1999年 | 40篇 |
| 1998年 | 30篇 |
| 1997年 | 34篇 |
| 1996年 | 25篇 |
| 1995年 | 15篇 |
| 1994年 | 12篇 |
| 1993年 | 7篇 |
| 1992年 | 5篇 |
| 1991年 | 4篇 |
| 1990年 | 5篇 |
| 1989年 | 3篇 |
排序方式： 共有2061条查询结果，搜索用时 15 毫秒
41.
Ivan Cuk Dragan Mirkov Aleksandar Nedeljkovic Milos Kukolj Dusan Ugarkovic 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(2):207-219
The present study explored the method of testing muscle mechanical properties through the linear force–velocity (F–V) relationships obtained from loaded vertical jumps. Specifically, we hypothesised that the F–V relationship parameters depicting the force, power, and velocity of the tested muscles will differ among individuals of different physical fitness. Strength trained, physically active, and sedentary male participants (N = 10 + 10 + 10; age 20–29 years) were tested on maximum countermovement and squat jumps where manipulation of external loads provided a range of F and V data. The observed F–V relationships of the tested leg muscles were approximately linear and mainly strong (median correlation coefficients ranged from 0.77 to 0.92; all p < 0.05), independently of either the tested group or the jump type. The maximum power revealed higher values in the strength trained than in the physically active and sedentary participants. This difference originated from the differences in F-intercepts, rather than from the V-intercepts. We conclude that the observed parameters could be sensitive enough to detect the differences among both the individuals of different physical fitness and various jump types. The present findings support using loaded vertical jumps and, possibly, other maximum performance multi-joint movements for the assessment of mechanical properties of active muscles. 相似文献
42.
负载自适应的CoMP调度策略 总被引：1，自引：0，他引：1
研究LTE-A下行CoMP调度技术.针对系统负载差异的场景,说明单一CoMP调度模式的缺陷;同时针对2类CoMP技术,给出相应地提高小区边缘和小区整体吞吐量的调度策略.通过理论分析和系统级仿真验证,研究系统负载对调度策略性能的影响,最后提出一种能自适应于非均衡负载的CoMP调度策略.综合评估表明,CoMP联合传输在低负载下和CoMP协调调度在高负载下均具有较优性能,而优化策略复杂度低,且能适应系统负载变化,可进一步提高系统性能. 相似文献
43.
Information and communication technologies (ICT) have brought about renewed spaces for the societies of today, full of possibility and transformation. Bordering on the infinite, these spaces have generated new activities and behaviors. This technological scenario is now commonplace, an everyday reality that has taken root in our lives with remarkable speed. Now would therefore be an appropriate time to open up a line of inquiry into how this is shaping educational practice and how it is affecting our cognitive structures. We have chosen to conduct a review of relevant literature that will enable us to adopt a critical analysis to our subject: education and, above all, the learner, seen from the perspective of neuroscience and social analysis. However, the principal aim of this paper is to lay bare the disparities between research findings and current educational practices that use ICT. 相似文献
44.
为了适应高职实验室迅速发展,应构建一个合理、有效的实验室技术人员工作量计算与评价体系,以调动实验人员的工作积极性,提高实验教学质量,优化实验室管理。 相似文献
45.
董仲舒廉政思想的核心是正义、正我和正民。正义是构建符合儒家道德的核心价值体系,这是董仲舒廉政思想的基础;正我是正义的方法,主要针对统治者而言,其中心内容是＂正君＂和＂正百官＂;正民是董仲舒廉政思想的归宿,即使人民安仁乐义,形成良好的社会风俗。 相似文献
46.
林火生 《柳州职业技术学院学报》2011,11(4):66-70
在分析户式中央空调系统热稳定性影响因素的基础上,给出了改善系统稳定性的设计措施,并结合一个别墅户式中央空调系统设计实例,从系统热稳定性的角度进行了设计分析,还指出了改善户式中央空调变频机组系统热稳定性的其他措施,为设计舒适、节能的户式中央空调系统提供参考。 相似文献
47.
吴刚 《绵阳师范学院学报》2011,30(8):83-89
该文主要介绍了Cisco的HSRP(热备份路由协议)产生的历史背景及其工作原理。HSRP和MHSRP(多元热备份路由协议)能够实现路由器热备份,端口追踪,网络负载共享。网络设计工程师在设计IP网络的过程中灵活地使用HSRP和MHSRP能够设计出高可靠、高性价比的网络解决方案。 相似文献
48.
In the anatomical sciences, e‐learning tools have become a critical component of teaching anatomy when physical space and cadaveric resources are limited. However, studies that use empirical evidence to compare their efficacy to visual‐kinesthetic learning modalities are scarce. The study examined how a visual‐kinesthetic experience, involving a physical skeleton, impacts learning when compared with virtual manipulation of a simple two‐dimensional (2D) e‐learning tool, A.D.A.M. Interactive Anatomy. Students from The University of Western Ontario, Canada (n = 77) participated in a dual‐task study to: (1) investigate if a dual‐task paradigm is an effective tool for measuring cognitive load across these different learning modalities; and (2) to assess the impact of knowledge recall and spatial ability when using them. Students were assessed using knowledge scores, Stroop task reaction times, and mental rotation test scores. Results demonstrated that the dual‐task paradigm was not an effective tool for measuring cognitive load across different learning modalities with respect to kinesthetic learning. However, our study highlighted that handing physical specimens yielded major, positive impacts on performance that a simple commercial e‐learning tool failed to deliver (P < 0.001). Furthermore, students with low spatial ability were significantly disadvantaged when they studied the bony joint and were tested on contralateral images (P = 0.046, R = 0.326). This suggests that, despite limbs being mirror images, students should be taught the anatomy of, as well as procedures on, both sides of the human body, enhancing the ability of all students, regardless of spatial ability, to take anatomical knowledge into the clinic and perform successfully. Anat Sci Educ 10: 570–588. © 2017 American Association of Anatomists. 相似文献
49.
This essay posits that masculinity can be usefully understood from a communication perspective, and it specifically defines masculinity as a social and symbolic construct. In this view, the meanings and associations attributed to masculinity are a product of the enduring images and characteristics people have ascribed and assigned to men in groups over time. Based upon a survey of contemporary published research regarding masculinity, it is concluded that masculinity is now a multidimensional construct which attributes ten traits to people viewed as masculine which are examined in terms of: (1) physiological energy; (2) physical characteristics; (3) gender‐related sociocultural roles; (4) idealized gender; (5) gender preferences; (6) subjective gender‐identity; (7) gender‐related age identity; (8) gender‐related racial and national identities; (9) lust; and, (10) male eroticism. Specific questionnaires used to measure these dimensions are reviewed, and based on the responses of 562 subjects, the reliability and validity of one of these questionnaires is examined in detail. The essay concludes by recommending the use of the Perceived Masculinity Questionnaire 47, and it outlines some of the uses that can be made of a Perceived Masculinity Scale, especially some potential classroom uses. 相似文献
50.
通过剖析45名2002年体育高考学生的术科和化高考取得优异成绩时的生理节律,发现生理节律与高考成绩关系密切．学生处在高潮期时易于考出好成绩．体育术科高考成绩主要与体力钟、情绪钟密切相关;化课高考成绩主要与智力钟、情绪钟密切相关． 相似文献