全文获取类型
收费全文 | 2663篇 |
免费 | 70篇 |
国内免费 | 9篇 |
专业分类
教育 | 2014篇 |
科学研究 | 127篇 |
各国文化 | 65篇 |
体育 | 254篇 |
综合类 | 1篇 |
文化理论 | 28篇 |
信息传播 | 253篇 |
出版年
2022年 | 18篇 |
2021年 | 20篇 |
2020年 | 45篇 |
2019年 | 68篇 |
2018年 | 104篇 |
2017年 | 111篇 |
2016年 | 103篇 |
2015年 | 64篇 |
2014年 | 93篇 |
2013年 | 605篇 |
2012年 | 81篇 |
2011年 | 78篇 |
2010年 | 69篇 |
2009年 | 81篇 |
2008年 | 98篇 |
2007年 | 72篇 |
2006年 | 75篇 |
2005年 | 68篇 |
2004年 | 52篇 |
2003年 | 69篇 |
2002年 | 65篇 |
2001年 | 43篇 |
2000年 | 31篇 |
1999年 | 40篇 |
1998年 | 22篇 |
1997年 | 40篇 |
1996年 | 39篇 |
1995年 | 38篇 |
1994年 | 23篇 |
1993年 | 26篇 |
1992年 | 23篇 |
1991年 | 31篇 |
1990年 | 20篇 |
1989年 | 27篇 |
1988年 | 16篇 |
1987年 | 14篇 |
1986年 | 27篇 |
1985年 | 17篇 |
1984年 | 17篇 |
1983年 | 19篇 |
1982年 | 26篇 |
1981年 | 18篇 |
1980年 | 10篇 |
1979年 | 26篇 |
1978年 | 12篇 |
1977年 | 14篇 |
1976年 | 12篇 |
1974年 | 8篇 |
1972年 | 6篇 |
1967年 | 6篇 |
排序方式: 共有2742条查询结果,搜索用时 15 毫秒
31.
Although the effectiveness of inoculation as a strategy for promoting resistance to attitude change is fairly well established, the potential of inoculation messages to offer cross-protection for related, but untreated, attitudes warrants additional attention from scholars. The reported study tested the “blanket of protection” conferred by inoculation. Participants (N = 118) were randomly assigned to read an inoculation message addressing a target topic and subsequently had their attitudes toward three related, but untreated, topics attacked. The results offer some evidence that inoculation messages can confer cross-protection for related attitudes. Participants in the inoculation condition reported greater perceptions of threat, greater counterarguing, and less attitude change in response to attacks than participants in the control condition for two of the three untreated topics. Counterarguing in response to attacks on untreated attitudes appears to be primarily responsible for cross-protection. 相似文献
32.
Cheng-Shiun He William D. Fraser Jonathan Tang Kirsty Brown Stephen Renwick Jay Rudland-Thomas 《Journal of sports sciences》2016,34(1):67-74
Heavy training is associated with increased respiratory infection risk and antimicrobial proteins are important in defence against oral and respiratory tract infections. We examined the effect of 14 weeks of vitamin D3 supplementation (5000 IU/day) on the resting plasma cathelicidin concentration and the salivary secretion rates of secretory immunoglobulin A (SIgA), cathelicidin, lactoferrin and lysozyme in athletes during a winter training period. Blood and saliva were obtained at the start of the study from 39 healthy men who were randomly allocated to vitamin D3 supplement or placebo. Blood samples were also collected at the end of the study; saliva samples were collected after 7 and 14 weeks. Plasma total 25(OH)D concentration increased by 130% in the vitamin D3 group and decreased by 43% in the placebo group (both P = 0.001). The percentage change of plasma cathelicidin concentration in the vitamin D3 group was higher than in the placebo group (P = 0.025). Only in the vitamin D3 group, the saliva SIgA and cathelicidin secretion rates increased over time (both P = 0.03). A daily 5000 IU vitamin D3 supplement has a beneficial effect in up-regulating the expression of SIgA and cathelicidin in athletes during a winter training period, which could improve resistance to respiratory infections. 相似文献
33.
Jonathan P. Norris Jamie Highton Stephen F. Hughes Craig Twist 《Journal of sports sciences》2016,34(19):1859-1866
The aim of this study was to investigate how the type of contact influences physiological, perceptual and locomotive load during a simulated rugby league match. Eleven male university rugby league players performed two trials of the rugby league movement simulation protocol for interchange forwards with a traditional soft tackle bag and a weighted tackle sled to replicate contact demands. The interchange forward-specific simulation was chosen given the contact frequency is higher for this group of players compared to whole match players. Locomotive rate, sprint speed, tackle intensity, heart rate (HR) and rating of perceived exertion were analysed during the first and second bouts that replicated two ~23 min on-field passages. Countermovement jump (CMJ) was measured before and immediately after each trial. More time was spent in heart rate zone between 91 and 100% HRpeak during the first (effect size ± 90% confidence interval: 0.44 ± 0.49) and second bouts (0.44 ± 0.43), and larger (0.6 ± 0.69) decrements in CMJ performance were observed during the sled trial (5.9, s = 4.9%) compared to the bag trial (2.6, s = 5.4%). Changing the type of contact during the match simulation subtly altered both the internal and external loads on participants. Using a standard tackle bag results in faster sprint speed to contact, but lower overall high-intensity running. Conversely, a heavier tackle object increases the internal load and results in greater lower limb neuromuscular fatigue as reflected by the decrease in CMJ performance. 相似文献
34.
This article reassesses The People's Choice by Paul Lazarsfeld, Bernard Berelson, and Hazel Gaudet, one of the foundations of communication and voting behavior research. As with most classics, which are often cited but seldom read, we believe this book has much to teach contemporary social scientists. We return to the original context of the research and use voting data from the period with three broad goals: (a) to find ideas and lessons from this work that generally have been overlooked, (b) to suggest new ways of applying these ideas, and (c) to encourage scholars to engage more with this seminal work to understand ideas that are often overlooked when a complex piece of research is reduced to a brief discussion or passing citation. 相似文献
36.
37.
38.
Marcone Stephen Reigeluth Charles M. 《Educational technology research and development : ETR & D》1988,36(1):23-32
This study investigated whether or not the teaching of matched examples and nonexamples in the form of common errors would
improve student performance in applying a procedure to previously unencountered instances, and whether the common errors would
be most beneficial in generality form, in example form, or in both forms. Participants were 141 first-year music students,
who were randomly assigned to four groups and given the task to learn a procedure that was presented in a self-contained booklet.
A pretest-posttest experimental design was used, with a prerequisite test given as a screening device. The two independent
variables were the absence and presence of the common errors in the generality form and in the example form (2 x 2 factorial
design). Results indicated that the teaching of common errors in the generality form significantly improved learning a procedure
at the application level of behavior. 相似文献
39.
40.
陈德淑 《重庆大学学报(英文版)》2003,2(2)
1. Introduction At present, it is necessary to use fertilizer to ensure the stable and high agricultural productivity. However, as we all know, the fertilizer not only decreases the self-fertility of soil, but also is accompanied with pesticide. Food poisoning caused by remnant pesticide in fruits and vegetables is often reported, and in such cases, chronic poisoning is the majority. The remnant pesticide accumulates in body gradually, and then induces kinds of disease. As reported, the Miyu… 相似文献