全文获取类型
收费全文 | 1687篇 |
免费 | 55篇 |
国内免费 | 32篇 |
专业分类
教育 | 969篇 |
科学研究 | 359篇 |
各国文化 | 17篇 |
体育 | 156篇 |
综合类 | 124篇 |
文化理论 | 7篇 |
信息传播 | 142篇 |
出版年
2024年 | 1篇 |
2023年 | 8篇 |
2022年 | 45篇 |
2021年 | 64篇 |
2020年 | 68篇 |
2019年 | 49篇 |
2018年 | 54篇 |
2017年 | 41篇 |
2016年 | 70篇 |
2015年 | 69篇 |
2014年 | 125篇 |
2013年 | 157篇 |
2012年 | 128篇 |
2011年 | 138篇 |
2010年 | 105篇 |
2009年 | 79篇 |
2008年 | 111篇 |
2007年 | 97篇 |
2006年 | 73篇 |
2005年 | 81篇 |
2004年 | 47篇 |
2003年 | 50篇 |
2002年 | 24篇 |
2001年 | 24篇 |
2000年 | 22篇 |
1999年 | 10篇 |
1998年 | 7篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1957年 | 2篇 |
排序方式: 共有1774条查询结果,搜索用时 812 毫秒
91.
Emiliya S. Egorova Alyona V. Borisova Leysan J. Mustafina Alina A. Arkhipova Rashid T. Gabbasov Anastasiya M. Druzhevskaya 《Journal of sports sciences》2014,32(13):1286-1293
AbstractResearch concerned with predictors of talent in football has highlighted a number of potentially important and partially inherited measures such as body size, anaerobic power, aerobic capacity, agility, psychological profile, game intelligence and susceptibility to injuries. Genotyping for performance-associated DNA polymorphisms at an early age could be useful in predicting later success in football. The aim of the study was to investigate individually and in combination the association of common gene polymorphisms with football player’s status. A total of 246 Russian football players and 872 controls were genotyped for 8 gene polymorphisms, which were previously reported to be associated with athlete status. Four alleles (ACE D, ACTN3 Arg577, PPARA rs4253778 C and UCP2 55Val) were first identified, showing discrete associations with football player’s status. Next, we determined the total genotype score (TGS, from the accumulated combination of the 4 polymorphisms, with a maximum value of 100 for the theoretically optimal polygenic score) in athletes and controls. The mean TGS was significantly higher in football players (52.0 (17.6) vs. 41.3 (15.5); P < 0.0001) than in controls. These data suggest that the likelihood of becoming a football player depends on the carriage of a high number of “favourable” gene variants. 相似文献
92.
针对公安机关特别是刑侦领域的掌纹自动识别技术需求,讨论基于高分辨率的掌纹细节特征点识别方法必要性.将细节特征点匹配方法作为重点,以Cafis指掌纹系统为例,分析掌纹细节特征点匹配算法的瓶颈,并与传统硬件并行和最新的GPU并行等提高掌纹比对速度的技术方法进行对比. 相似文献
93.
刘家贵 《安徽职业技术学院学报》2005,4(4):38-40
随着中国加入世界贸易组织和全球经济一体化进程的加快,我国企业正面临着前所未有的机遇和挑战。抓住机遇,迎接挑战,求得发展,完成企业战略目标,关键在于人才,特别是核心员工。文章针对当前国内企业核心人才流失严重、核心竞争力不强等问题,提出了关于解决这两大问题的关键即做好企业员工核心能力的识别,从而构建企业自身的核心员工队伍。 相似文献
94.
介绍一种基于模糊逻辑的预测方法,通过对发酵过程的模糊辨识,建立模糊预测控制模型.该模型应用于木糖醇发酵过程,取得了良好的效果. 相似文献
95.
96.
分析了汽车牌照的几何特征和成像特点,提出基于自适应性阈值的搜索策略,对图像中的车牌进行定位;利用Hough变换对图像进行倾斜矫正;然后设计一个三级分类器,对单个字符进行模式匹配,得到识别结果,最终实现对原始车牌图像的识别。 相似文献
97.
98.
99.
Ivan Bradaric Athina P. Petropulu Konstantinos I. Diamantaras 《Journal of The Franklin Institute》2002,339(2):161-187
Higher-order statistics (HOS) are well known for their robustness to additive Gaussian noise and ability to preserve phase. HOS estimates, on the other hand, have been criticized for high complexity and the need for long data in order to maintain small variance. Since rank reduction offers a general principle for reduction of estimator variance and complexity, we consider the problem of designing low-rank estimators for HOS. We propose three methods for choosing the transformation matrix that reduces the mean-square error (MSE) associated with the low-rank HOS estimates. We also demonstrate the advantages of using low-rank third-order moment estimates for blind system estimation. Results indicate that the full rank MSE corresponding to some data length N can be attained by a low-rank estimator corresponding to a length significantly smaller than N. 相似文献
100.
Dara J. Glasser Kenneth W. Goodman Norman G. Einspruch 《Ethics and Information Technology》2007,9(2):101-109
Radio Frequency Identification (RFID) systems identify and track objects, animals and, in principle, people. The ability to
gather information obtained by tracking consumer goods, government documents, monetary transactions and human beings raises
a number of interesting and important privacy issues. Moreover, RFID systems pose an ensemble of other ethical challenges
related to appropriate uses and users of such systems. This paper reviews a number of RFID applications with the intention
of identifying the technology’s benefits and possible misuses. We offer an overview and discussion of the most important ethical
issues concerning RFID, and describes and examine some methods of protecting privacy.
Norman G. Einspruch serves as a consultant to several high-technology companies, one of which is in the RFID components and
systems business. 相似文献