全文获取类型
| 收费全文 | 6125篇 |
| 免费 | 119篇 |
| 国内免费 | 77篇 |
专业分类
| 教育 | 4601篇 |
| 科学研究 | 776篇 |
| 各国文化 | 8篇 |
| 体育 | 337篇 |
| 综合类 | 343篇 |
| 文化理论 | 3篇 |
| 信息传播 | 253篇 |
出版年
| 2023年 | 19篇 |
| 2022年 | 47篇 |
| 2021年 | 72篇 |
| 2020年 | 98篇 |
| 2019年 | 91篇 |
| 2018年 | 79篇 |
| 2017年 | 69篇 |
| 2016年 | 89篇 |
| 2015年 | 159篇 |
| 2014年 | 375篇 |
| 2013年 | 421篇 |
| 2012年 | 551篇 |
| 2011年 | 534篇 |
| 2010年 | 396篇 |
| 2009年 | 380篇 |
| 2008年 | 390篇 |
| 2007年 | 491篇 |
| 2006年 | 448篇 |
| 2005年 | 396篇 |
| 2004年 | 314篇 |
| 2003年 | 261篇 |
| 2002年 | 207篇 |
| 2001年 | 209篇 |
| 2000年 | 101篇 |
| 1999年 | 34篇 |
| 1998年 | 21篇 |
| 1997年 | 21篇 |
| 1996年 | 10篇 |
| 1995年 | 11篇 |
| 1994年 | 7篇 |
| 1993年 | 7篇 |
| 1992年 | 4篇 |
| 1991年 | 1篇 |
| 1990年 | 1篇 |
| 1989年 | 2篇 |
| 1988年 | 1篇 |
| 1983年 | 1篇 |
| 1982年 | 1篇 |
| 1957年 | 2篇 |
排序方式： 共有6321条查询结果，搜索用时 15 毫秒
1.
运用文献资料、数理统计、VAR模型等方法，基于2005-2015年国民经济与体育产业发展统计指标数据，通过协整检验、向量误差模型、格兰杰因果检验、脉冲响应函数与方差分解等，对我国体育产业发展与国民经济增长之间的关系进行实证分析。研究结果为：（1）协整检验与向量误差模型分析显示，体育产业增加值与国民经济发展之间存在正相关长期协整关系，这种均衡关系具有反向修正机制，当均衡关系发生波动时，当期以-1.744 073倍的力度对前一期偏离状态进行调整，将其拉回到长期均衡状态；（2）格兰杰因果检验显示，体育产业发展是国民经济增长的Granger原因，但国民经济增长不是体育产业发展的Granger原因；（3）脉冲响应函数显示，国民经济波动对其自身发展与体育产业发展均产生负效应，体育产业对于自身冲击的脉冲响应呈正相关趋势，并且能够迅速促进国民经济发展。（4）方差分解显示，国民经济在其自身发展与体育产业发展中的作用呈逐渐增大之势，体育产业的影响则呈逐渐减小之势。最后，提出了"识别均衡关系：促进国民经济与体育产业互惠共生发展"、"衡量脉冲响应：降低国民经济与体育产业均衡发展负效应"、"重视方差分解：权衡国民经济与体育产业影响因素相对性"、"完善政策法规：优化国民经济与体育产业均衡发展制度环境"等促进国民经济与体育产业均衡发展的现实路径。 相似文献
2.
《Research Policy》2019,48(8):103766
Organizations build strategic alliances with other firms with the intent of tapping into partners’ resources and capturing long-term value from these relationships. Such partnerships are typically governed by contractual or equity arrangements with clear mutual obligations. More recently, however, organizations have begun to seek strategic partnerships with open innovation communities, which are novel digitally enabled forms of organizing, and where contractual commitments are not possible. Thus, selecting the right open innovation community as an alliance partner becomes a more complex decision. We follow how the organizational decision makers, in two technology firms that were pioneers of forming strategic alliances with open innovation communities, developed metrics around making such decisions. We build upon Shah and Swaminathan’s (2008) contingency model of alliance partner selection and consider how it applies to the case of partnering with open innovation communities. This framework was useful in to frame our findings, yet our work recognizes and builds upon two key differences: 1) the evaluation metrics used in selecting an open innovation community were more focused on value creation than value capture; and 2) open ecosystem considerations, and not just partner-specific metrics, featured prominently in this type of alliance partner evaluation. We develop the notions of community and ecosystem health to refer to these new metrics. 相似文献
3.
[目的/意义]在当前政府职能转变的背景下，政府与社会组织合作提供公共图书馆服务是公共图书馆管理体制改革的有效措施，也是公共图书馆事业发展的重要趋势。研究政府与社会组织的合作关系，不仅能够丰富相关理论成果，而且能为公共图书馆服务供给政社合作的发展提供参考。[目的/意义]通过文献调研、网络调研与实地调研相结合，论述公共图书馆服务供给政社合作关系的概念及特征，对公共图书馆服务供给政社合作关系中各主体的角色、政社合作关系的成因、政社合作关系的类型及形成过程进行深入分析。在此基础之上，提出公共图书馆服务供给政社合作关系可持续发展的对策。[结果/结论]良好合作关系的建立需要端正合作动机，完善合作制度，规范合作行为。 相似文献
4.
外部网络关系对企业双元创新的影响结果存在较大争议,企业维持何种状态的外部网络关系会促进双元创新,影响机理中知识吸收能力起到怎样的作用,这是亟需研究的问题。对387家企业为样本进行问卷调查,运用结构方程模型法,以知识获取能力和知识实现能力为双重中介,探析外部网络关系对企业双元创新的影响。研究结果表明：外部网络关系不同维度对双元创新具有差异化影响；网络关系强度和网络关系密度的提高以及网络关系深度的适度降低有利于渐进性创新,网络关系深度和网络关系密度的提高以及网络关系强度的适度降低更有利于突破性创新；知识吸收能力在外部网络关系对双元创新的影响中发挥部分中介作用。 相似文献
5.
董红刚 《武汉体育学院学报》2018,52(9):18-24
通过文献资料和专家访谈，梳理了建国以来的重大体育事件和体育政策文件，厘清了我国体育治理的发展脉络，总结出我国体育治理演进的特征，旨在提出未来我国体育治理运行机制需关注的4个要素。我国体育治理演进大体分为5个阶段，2条脉络贯穿始终：一是以奥运会为代表的竞技体育，二是以全民健身为代表的群众体育，在"体育为国"与"体育为人"中寻找社会认可、国家认同的均衡结果；3个主体复杂博弈：体育行政部门、体育市场主体、体育社会组织依次登台且反复切割边界，寻求内部结构均衡与外部协调发展。在这种"2脉络3维度"的分析框架下，我国体育治理演进呈现出4个特征：渐进性、反复性、导向性、收敛性。体育体现着强烈的国家意志，正因如此，调整体育治理结构、优化体育治理主体才会出现渐进性与反复性，最终政府、社会、市场在不同的体育子结构中收敛于最优匹配，进而建立体育全面协调发展的运行机制和支撑体系。我国体育治理演进的未来路向：构建多中心体育治理结构的制度形态，凝练互构共生的多元化体育治理主体，完善多样化体育治理手段的策略集合，制定社会化体育治理评价的指标体系，并且，将多中心结构、多元化主体、多样化手段、社会化评价4个要素通融于体育治理运行机制中。 相似文献
6.
ABSTRACT
The aim of this study was to compare the effects of 20 min neuromuscular training with a programme of 10 min in youth football players. 342 (15.4 ± 1.7 years) male football players from 18 teams were included, and cluster-randomized by team into two intervention groups. Both groups performed an injury prevention programme twice a week over five months using the same exercises but a different duration. The first intervention group (INT10, n = 175) performed the programme for 10 min, the second intervention group (INT20, n = 167) for 20 min. Primary outcomes were lower extremity (LE) injuries. Secondary outcomes were injury type, severity, mechanism and compliance to the intervention. 13 teams with 185 players were included for final analysis. No significant group difference was found between INT10 (6.37 per 1000 h) and INT20 (7.20 per 1000 h) for the incidence rate ratio of the lower extremities (IRR = 1.03, 95% confidence interval 0.59, 1.79), nor for the distribution of injury location, type, severity or mechanism. The results show that performing preventive exercises for 10 min is no less effective than 20 min in youth football players. Shorter training sessions can, therefore, be effectively used for injury prevention. 相似文献
7.
8.
Amador García-Ramos G. Gregory Haff Paulino Padial Belén Feriche 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(1):117-130
This study aimed to examine the reliability of different power and velocity variables during the Smith machine bench press (BP) and bench press throw (BPT) exercises. Twenty-two healthy men conducted four testing sessions after a preliminary BP one-repetition maximum (1RM) test. In a counterbalanced order, participants performed two sessions of BP in one week and two sessions of BPT in another week. Mean propulsive power, peak power, mean propulsive velocity, and peak velocity at each tenth percentile (20–70% of 1RM) were recorded by a linear transducer. The within-participants coefficient of variation (CV) was higher for the load–power relationship compared to the load–velocity relationship in both the BP (5.3% vs. 4.1%; CV ratio = 1.29) and BPT (4.7% vs. 3.4%; CV ratio = 1.38). Mean propulsive variables showed lower reliability than peak variables in both the BP (5.4% vs. 4.0%, CV ratio = 1.35) and BPT (4.8% vs. 3.3%, CV ratio = 1.45). All variables were deemed reliable, with the peak velocity demonstrating the lowest within-participants CV. Based upon these findings, the peak velocity should be chosen for the accurate assessment of BP and BPT performance. 相似文献
9.
This study examines the relationships between the environmental attitudes and environmental knowledge of schoolchildren within the framework of an environmental intervention. We employed questions from the 2-MEV model to monitor students’ environmental attitudes in terms of the model factors Preservation and Utilisation while concurrently monitoring three environmental knowledge dimensions (system, action-related and effectiveness knowledge) at three different test times during the course of a four-day field centre programme for fourth-graders (N = 133, Mage = 9.8 years). Probably due to measurement constraints (e.g. a ceiling effect, social desirability), we found no correlation between environmental knowledge and the attitude Preservation at all test times. The attitude Utilisation correlated negatively with all environmental knowledge dimensions, indicating that students who score higher on Utilisation are more likely, for example, to have and gain more system knowledge through programme participation than the other students or vice versa, as a causal relationship cannot be derived from our analyses: system knowledge may also influence Utilisation. In other words, children who refrain from (ab)using nature also seem to put more effort into improving their environmental knowledge and/or children who engage in learning about the environment will become less exploitative towards the environment. 相似文献
10.
区域间专利引证对技术知识的跨区域流动与共享具有重要作用。以纳米领域为例,收集2011—2015年专利引证数据,剖析全国31个省份间专利引证关系并进行分类,构建区域间引证关系的影响指标,利用泊松和负二项模型进行回归与检验。得出:高被引、高引证、双高地区均集中在北上广苏等区域,引证密度快速增加;引证量与自引率持续增高,被引量下降,说明纳米领域专利技术的区域辐射效果较弱,区域间专利引证不活跃;回归分析发现区域RD经费、科技覆盖范围、h指数与区域间专利引证存在正相关。综上所述,给出了提升中国区域间专利技术引证的对策建议。 相似文献