首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1232篇
  免费   15篇
  国内免费   24篇
教育   720篇
科学研究   215篇
各国文化   7篇
体育   82篇
综合类   57篇
文化理论   2篇
信息传播   188篇
  2023年   2篇
  2022年   20篇
  2021年   36篇
  2020年   30篇
  2019年   19篇
  2018年   16篇
  2017年   16篇
  2016年   13篇
  2015年   45篇
  2014年   48篇
  2013年   88篇
  2012年   73篇
  2011年   114篇
  2010年   101篇
  2009年   89篇
  2008年   79篇
  2007年   107篇
  2006年   93篇
  2005年   57篇
  2004年   48篇
  2003年   41篇
  2002年   31篇
  2001年   21篇
  2000年   24篇
  1999年   14篇
  1998年   10篇
  1997年   10篇
  1996年   6篇
  1995年   1篇
  1994年   5篇
  1992年   5篇
  1991年   1篇
  1990年   1篇
  1988年   2篇
  1986年   1篇
  1982年   1篇
  1981年   2篇
  1979年   1篇
排序方式: 共有1271条查询结果,搜索用时 38 毫秒
71.
介绍美国SBA专利权担保融资模式,分析其机制和风险防范措施,并对我国推进专利权担保融资业务提出借鉴和发展思路.  相似文献   
72.
孔英民 《科教文汇》2014,(19):35-36
中国古代文学课程本是一门充满前贤智慧,集艺术性、知识性、趣味性、思想性于一体的课程。但是从现状看,很多学生对该课程并不满意。因此古代文学教师必须清楚认识到古代文学教学中存在的问题,适应现代环境,寻找正确的教学相长的方法以提高古代文学课程的教学质量。  相似文献   
73.
随着通信技术的快速发展和通信新应用的广泛普及.高校通信类专业课程需要不断进行教学改革,建立科学的课程教学模式和实践模式,实施创新型人才培养。本文针对我校现代交换技术课程的教学实践过程.阐述了多元化课堂教学模式、多层次实践教学环节以及课程考核评定的具体措施,指出建设开放性教学资料、采用多样化课堂教学方法、培养学生的研究性学习能力和实践创新能力对专业课教学的重要性,对提升课程教学质量和培养创新型专业人才模式进行了有益探索。  相似文献   
74.
采用连续标准加入法,利用标准计算图求值来测定水中氟化物浓度,该法测得的回收率,精密度均令人满意。  相似文献   
75.
中国网络咨询业的现状与发展   总被引:1,自引:0,他引:1  
本文在解释网络咨询概念的基础上,主要分析中国网络咨询的发展现状、存在的问题,并对中国网络咨询业的发展前景进行预测。  相似文献   
76.
脑科学与类脑智能技术相互借鉴、相互融合代表了未来脑科学与类脑智能研究的新趋势。中科院在脑科学研究上具有深厚积累和特色优势,率先启动了"脑功能联结图谱"战略性先导科技专项(B类),选择感知觉、学习记忆等几种重要大脑功能,绘制其神经环路图谱,解析其信息处理加工规律;率先在脑科学和智能技术两大领域进行实质性融合,在先导专项中扩充了类脑智能研究内容,成立了中科院脑科学与智能技术卓越创新中心,全面推进脑科学与类脑智能研究深度融合,为我国智能产业的发展提供科技引领与支撑。在分析国际脑科学与类脑智能发展态势的基础上,文章阐述了中科院在脑科学与类脑智能研究方面的部署,提出了进一步加强脑科学与智能技术融合的举措与建议。  相似文献   
77.
南海北部早第三纪流沙港组孢粉组合   总被引:1,自引:0,他引:1  
In the northern part of South China Sea, including Tonkin Gulf, Hainan lsland, Leizhon Peninsula and some basin of Guangdong  Province,  Paleogene  deposits  are composed of three formations: the Weizhon, the Liushagang and the Changliu forma- tions arranged in descending order.  The paper on the palynoflora of the Weizhon Formation (early and middle Oligocene) is in press[2].  This paper deals only with the palynoflora of the Liushagang Formation, with may be divided into four main stages:       The first stage is represented by Monocolpollenites tranquillus and Crassoretitri- letes sp., assigned to early Eocene The second stage is characterized by Salixipollenites, Momipites triletipollenites and Operculumpollis.  Its age is middle Eocene.  The third stage is dominated by some species of Quercoidites  and  Ulmipollenites  and  also characterized by the presence of Platycaryapollenites  and Prominangularia  dogying- ensis, This sporo-pollen assemblage suggests a late Eocene in age.  The fouth stage is marked by profusion of some alga of brockish water, such as Rugasphera corrugia, Granodiscus gronulatus and some pollen types  of  Liquidambarpollenites   minutus, Multiporopollenites puctatus and Tricolporopollenites minutus.  The age of the last stage is assigned to early oliocene.       In generaly, the palynoflora of the Liushagang Formation is quite different from that of the Weizhou Formation.  The main types of spores and pollen are common with those found in Europe and North America of the same age, while the Weizhou Formation has many elements common both in this region and Borneo.       During Eocene and early Oligocene this area was  of continental  phase with brackish basins. At the beginning the climate was rather moist and hot, but then itbecame moist and warmtemperate.  相似文献   
78.
Collaboration usually has a positive effect on researchers’ productivity: researchers have become increasingly collaborative, according to recent studies. Numerous studies have focused on enhancing research collaboration by recommendation technology and measuring the influence of researchers. However, few studies have investigated the effect of collaboration on the position of a researcher in the research social network. In this paper, we explore the relationships between collaboration and influence by social analytical methods, which are pertinent to analyzing the network structure and individual traits. We evaluate three aspects of the researchers’ influence: friendship paradox validation, social circle, and structure of a researcher's ego network. Furthermore, the ”six degrees of Bacon number” theory, generalized friendship paradox, and triadic closure theory are introduced to support our analysis. Experimental results show that collaboration can help researchers increase their influence to some extent.  相似文献   
79.
The requirement for An electrical grid-connected wind turbine is that the synchronous generator speed is stable within a required speed range for the electrical grid. In this paper, a hydraulic wind turbine (HWT) system is considered, and the working principle and working conditions of the HWT are introduced. A novel speed control method is proposed in this paper, using both a proportional flow control valve and a variable displacement motor, which are adjusted in combination to control the speed of the HWT. By establishing a state space model of the HWT and solving the nonlinear system with a feedback linearization method, a bivariate tracking controller is constructed to realize accurate speed control under fluctuating wind speed and the load disturbance conditions. The effectiveness of the control method is verified by simulation, but experimental results highlight problems with the method. The theoretical controller is simplified to reduce sensitivity to measurement noise and modeling error. The control effect has been improved to some extent, but it is limited. Based on these results, combined with the sliding mode variable structure control method and the feedback linearization method to solve the problem of measurement noise and modeling error, and the effectiveness of the control law is finally verified experimentally. It lays a theoretical foundation for the practical application of HWT.  相似文献   
80.
通过文献资料法、专家访谈法、调查问卷法、数理统计法、逻辑分析法,对南京市部分高职院校的乒乓球选项课开展情况进行了调查和研究,并提出建设性建议。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号