全文获取类型
收费全文 | 28049篇 |
免费 | 479篇 |
国内免费 | 37篇 |
专业分类
教育 | 20300篇 |
科学研究 | 2327篇 |
各国文化 | 300篇 |
体育 | 2155篇 |
综合类 | 38篇 |
文化理论 | 295篇 |
信息传播 | 3150篇 |
出版年
2022年 | 154篇 |
2021年 | 294篇 |
2020年 | 482篇 |
2019年 | 649篇 |
2018年 | 893篇 |
2017年 | 1007篇 |
2016年 | 938篇 |
2015年 | 569篇 |
2014年 | 746篇 |
2013年 | 5419篇 |
2012年 | 727篇 |
2011年 | 802篇 |
2010年 | 628篇 |
2009年 | 597篇 |
2008年 | 691篇 |
2007年 | 659篇 |
2006年 | 570篇 |
2005年 | 531篇 |
2004年 | 481篇 |
2003年 | 453篇 |
2002年 | 499篇 |
2001年 | 524篇 |
2000年 | 500篇 |
1999年 | 468篇 |
1998年 | 273篇 |
1997年 | 310篇 |
1996年 | 331篇 |
1995年 | 270篇 |
1994年 | 280篇 |
1993年 | 252篇 |
1992年 | 376篇 |
1991年 | 351篇 |
1990年 | 383篇 |
1989年 | 357篇 |
1988年 | 352篇 |
1987年 | 289篇 |
1986年 | 306篇 |
1985年 | 375篇 |
1984年 | 318篇 |
1983年 | 308篇 |
1982年 | 242篇 |
1981年 | 244篇 |
1980年 | 213篇 |
1979年 | 283篇 |
1978年 | 257篇 |
1977年 | 221篇 |
1976年 | 181篇 |
1975年 | 144篇 |
1974年 | 130篇 |
1973年 | 155篇 |
排序方式: 共有10000条查询结果,搜索用时 750 毫秒
51.
D A Sedlock 《Research quarterly for exercise and sport》1991,62(2):213-216
This study was designed to examine the magnitude and duration of excess postexercise oxygen consumption (EPOC) following upper body exercise, using lower body exercise for comparison. On separate days and in a counterbalanced order, eight subjects (four male and four female) performed a 20-min exercise at 60% of mode-specific peak oxygen uptake (VO2) using an arm crank and cycle ergometer. Prior to each exercise, baseline VO2 and heart rate (HR) were measured during the final 15 min of a 45-min seated rest. VO2 and HR were measured continuously during the postexercise period until baseline VO2 was reestablished. No significant difference between the two experimental conditions was found for magnitude of EPOC (t [7] = 0.69, p greater than .05). Mean (+/- SD) values were 9.2 +/- 3.3 and 10.4 +/- 5.8 kcal for the arm crank and cycle ergometer exercises, respectively. Duration of EPOC was relatively short and not significantly different (t [7] = 0.24, p greater than .05) between the upper body (22.9 +/- 13.7 min) and lower body (24.2 +/- 19.4 min) exercises. Within the framework of the chosen exercise conditions, these results suggest EPOC may be related primarily to the relative metabolic rate of the active musculature, as opposed to the absolute exercise VO2 or quantity of active muscle mass associated with these two types of exercise. 相似文献
52.
53.
54.
55.
Renáta Tichá Christine A. Espin Miya Miura Wayman 《Learning disabilities research & practice》2009,24(3):132-142
The validity and reliability of curriculum‐based measures in reading as indicators of performance and progress for secondary‐school students were examined. Thirty‐five grade 8 students completed reading aloud and maze‐selection measures weekly for 10 weeks. Criterion measures were the state standards test in reading and the Woodcock–Johnson III Test of Achievement. Different time frames for each measure were compared. Most alternate‐form reliability coefficients were above .80. Criterion‐related validity coefficients ranged from .77 to .89. No differences related to time were found. Only maze selection reflected significant growth, with an average increase of 1.29 correct choices per week. Maze growth was related to the reading performance level and to change on the Woodcock–Johnson III from pre‐ to posttest. 相似文献
56.
57.
A.F. Zahm 《Journal of The Franklin Institute》1948,245(4):331-336
58.
Extramural funding to support communication research influences and is influenced by the culture of our discipline, universities, and departments. Both the National Communication Association and the International Communication Association have established closer ties to funding agencies and encouraged members' grant writing pursuits through mentorship and convention programs, newsletter columns, and publicity. Universities vary in how much support they have available as infrastructure to assist in the submission and administration of grants. Some institutions facilitate extramural funding endeavors through mentoring programs, university-wide research centers, sharing of indirect costs, and space. Department cultures, too, vary in the resources available to support grants. Departments in many ways have the most direct effects on grant-supporting cultures. In addition to activities indicated for the discipline and university, departments can build a grant culture by recognizing grant writing in their personnel practices, creating systems for rewarding and supporting grant activities, and having policies in place for the many related issues (e.g., release time, indirect cost sharing, research assistants). Finally, the interpersonal culture, whether colleagues recognize and support grants, plays a major role in individual pursuit of, and satisfaction with, seeking extramural funding to support communication research. 相似文献
59.
60.