全文获取类型
收费全文 | 4889篇 |
免费 | 81篇 |
国内免费 | 81篇 |
专业分类
教育 | 3410篇 |
科学研究 | 460篇 |
各国文化 | 2篇 |
体育 | 553篇 |
综合类 | 432篇 |
文化理论 | 8篇 |
信息传播 | 186篇 |
出版年
2024年 | 1篇 |
2023年 | 12篇 |
2022年 | 33篇 |
2021年 | 61篇 |
2020年 | 78篇 |
2019年 | 90篇 |
2018年 | 69篇 |
2017年 | 80篇 |
2016年 | 89篇 |
2015年 | 114篇 |
2014年 | 298篇 |
2013年 | 351篇 |
2012年 | 311篇 |
2011年 | 355篇 |
2010年 | 236篇 |
2009年 | 247篇 |
2008年 | 302篇 |
2007年 | 403篇 |
2006年 | 358篇 |
2005年 | 313篇 |
2004年 | 268篇 |
2003年 | 242篇 |
2002年 | 201篇 |
2001年 | 159篇 |
2000年 | 134篇 |
1999年 | 59篇 |
1998年 | 43篇 |
1997年 | 36篇 |
1996年 | 27篇 |
1995年 | 22篇 |
1994年 | 22篇 |
1993年 | 16篇 |
1992年 | 6篇 |
1991年 | 9篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1979年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有5051条查询结果,搜索用时 7 毫秒
21.
边晋中 《内蒙古师范大学学报(哲学社会科学版)》2007,36(1):19-24
笔者据档案奏折,考定绥远新城是经雍正、乾隆两朝皇帝厦永泰、通智、瞻岱、王山、王常五位官员不懈努力,于乾隆二年二月初七日正式动工,历872天修筑,乾隆四年六月二十二日竣工。这些奏折基本勾勒出绥远城修筑的大致经过。 相似文献
22.
回顾系泊船舶的行为和在泊位设计时系缆配备的一般原则.系泊力是码头及泊位靠泊能力的一个重要因素.影响系泊力的因素有风、流及波浪等,这些外力的影响通过缆绳传递给泊位及码头自身.结合油船系泊的行业要求,分析系泊设计的基本要求.探讨频率域和时域模型在船舶系泊上的应用. 相似文献
23.
24.
覃新菊 《信阳师范学院学报(哲学社会科学版)》2006,26(6):1-5
沈从文的时间意识与死亡意识相生相成,构成沈从文“生命哲学”的重要而又特殊的组成部分。他认为时间的魔力巨大,能消融生命,能治疗痛苦,还能造就创作;他的时间意识停留在“过去”,具有“过去式”、“静态化”与“突变性”的特点。 相似文献
25.
Daniel D. Bingham Silvia Costa Stacy A. Clemes Ash C. Routen Helen J. Moore Sally E. Barber 《Journal of sports sciences》2016,34(20):2005-2010
This study presents a worked example of a stepped process to reliably estimate the habitual physical activity and sedentary time of a sample of young children. A total of 299 children (2.9 ± 0.6 years) were recruited. Outcome variables were daily minutes of total physical activity, sedentary time, moderate to vigorous physical activity and proportional values of each variable. In total, 282 (94%) provided 3 h of accelerometer data on ≥1 day and were included in a 6-step process: Step-1: determine minimum wear-time; Step-2: process 7-day-data; Step-3: determine the inclusion of a weekend day; Step-4: examine day-to-day variability; Step-5: calculate single day intraclass correlation (ICC) (2,1); Step-6: calculate number of days required to reach reliability. Following the process the results were, Step-1: 6 h was estimated as minimum wear-time of a standard day. Step-2: 98 (32%) children had ≥6 h wear on 7 days. Step-3: no differences were found between weekdays and weekend days (P ≥ 0.05). Step-4: no differences were found between day-to-day variability (P ≥ 0.05). Step-5: single day ICC’s (2,1) ranged from 0.48 (total physical activity and sedentary time) to 0.53 (proportion of moderate to vigorous physical activity). Step-6: to reach reliability (ICC = 0.7), 3 days were required for all outcomes. In conclusion following a 7 day wear protocol, ≥6 h on any 3 days was found to have acceptable reliability. The stepped-process offers researchers a method to derive sample-specific wear-time criterion. 相似文献
26.
Martin Weiss Alexandra Newman Ceri Whitmore Stephan Weiss 《European Journal of Sport Science》2016,16(4):393-401
Sprint and distance running have experienced remarkable performance improvements over the past century. Attempts to forecast running performances share an almost similarly long history but have relied so far on relatively short data series. Here, we compile a comprehensive set of season-best performances for eight Olympically contested running events. With this data set, we conduct (1) an exponential time series analysis and (2) a power-law experience curve analysis to quantify the rate of past performance improvements and to forecast future performances until the year 2100. We find that the sprint and distance running performances of women and men improve exponentially with time and converge at yearly rates of 4% ± 3% and 2% ± 2%, respectively, towards their asymptotic limits. Running performances can also be modelled with the experience curve approach, yielding learning rates of 3% ± 1% and 6% ± 2% for the women's and men's events, respectively. Long-term trends suggest that: (1) women will continue to run 10–20% slower than men, (2) 9.50 s over 100 m dash may only be broken at the end of this century and (3) several middle- and long-distance records may be broken within the next two to three decades. The prospects of witnessing a sub-2 hour marathon before 2100 remain inconclusive. Our results should be interpreted cautiously as forecasting human behaviour is intrinsically uncertain. The future season-best sprint and distance running performances will continue to scatter around the trends identified here and may yield unexpected improvements of standing world records. 相似文献
27.
周绍平 《江苏广播电视大学学报》2005,16(6):58-60
单片机开发应用中经常用到延时控制,延时控制的基本方法有纯软件、纯硬件及软硬件结合方法,它们都有各自的特点及应用范围,以1秒延时为例给出用三种方法实现的过程,并介绍了软硬件结合延时的应用实例。 相似文献
28.
李建栋 《阜阳师范学院学报(社会科学版)》2006,(3):1-3
文章通过对《文馆词林》所存两篇残敕的文本进行分析,并将其与历史资料对照验证,得出此二敕的作者均为唐太宗,此二敕的写作时间分别为贞观二年(528)正月、三月。 相似文献
29.
30.
李萍 《黄河科技大学学报》2003,5(2):124-126
网络时代,高校师生的学习方式和生活方式发生了深刻变化。互联网在促进教育发展和人才培养的同时,对学生的消极影响不容忽视。要多方面加强思想政治工作,如开辟网上“思想政治教育课堂”、设置“网上德育阵地”、建立信息监控等。 相似文献