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   430篇
  免费   3篇
  国内免费   23篇
教育   314篇
科学研究   111篇
各国文化   2篇
体育   10篇
综合类   8篇
文化理论   1篇
信息传播   10篇
  2023年   2篇
  2022年   3篇
  2021年   5篇
  2020年   8篇
  2019年   4篇
  2018年   4篇
  2017年   2篇
  2016年   1篇
  2015年   10篇
  2014年   22篇
  2013年   26篇
  2012年   22篇
  2011年   26篇
  2010年   31篇
  2009年   43篇
  2008年   31篇
  2007年   44篇
  2006年   35篇
  2005年   34篇
  2004年   17篇
  2003年   19篇
  2002年   8篇
  2001年   6篇
  2000年   8篇
  1999年   12篇
  1998年   3篇
  1997年   5篇
  1996年   6篇
  1995年   5篇
  1994年   2篇
  1993年   4篇
  1992年   2篇
  1990年   1篇
  1989年   1篇
  1988年   2篇
  1985年   1篇
  1984年   1篇
排序方式: 共有456条查询结果,搜索用时 0 毫秒
51.
设{xn}n≥0是任意的m阶等差数列,本文证明:对任意的n≥0,(m+1)阶行列式的值与n无关,因而是这类数列的一个不变量,并且这一结论是一般常系数齐次线性追归数列的一个普遍性质的特例.  相似文献   
52.
A recent classroom revelation caused us to reconsider the adequacy of the instructions offered in our textbooks for one of our most elementary quantitative methods. Specifically, we found that many students were mystified concerning how to pick an initial objective function value when plotting an isoprofit line in order to graphically solve a linear programming problem. We observed that this seemingly insignificant issue was causing a surprising amount of wasted time, confusion, and even anxiety. Our experience indicated that students do not necessarily possess any consistent intuition for choosing an appropriate initial value. We confirmed this perception through informal experimentation. We reviewed several textbooks and found that most simply do not bother to address this issue. Therefore, we devised a simple, comprehensible method which we have taught our students to resolve or avoid this problem. Although we quickly found the method to be helpful for many students, we conducted an experiment to formally measure its effect.  相似文献   
53.
通过一道中考综合题的分析。阐述了培养学生分类思想、化归思想等数学思想的思维过程。  相似文献   
54.
For linear switched system with both parameter uncertainties and time delay, a delay-dependent sufficient condition for the existence of a new robustH feedback controller was formulated in nonlinear matrix inequalities solvable by an LMI-based iterative algorithm. Compared with the conventional state-feedback controller, the proposed controller can achieve better robust control performance since the delayed state is utilized as additional feedback information and the parameters of the proposed controllers are changed synchronously with the dynamical characteristic of the system. This design method was also extended to the case where only delayed state is available for the controller. The example of balancing an inverted pendulum on a cart demonstrates the effectiveness and applicability of the proposed design methods. Project (No. 2002CB312200) supported by the National Basic Research Program (973) of China  相似文献   
55.
提出了“间接法”和“直接法”两种实现线性方程组与信号流图互换的方法,通过实例说明两种方法的正确性。  相似文献   
56.
The aim of the current paper is to share the processes in revising the courseware of the course of Engineering Management Science coded as ENG4004, in the Bachelor of Engineering (Mechanical, Mechatronics, Electrical and Electronic, Computer Systems, Instrumentation and Control), Bachelor of Engineering Technology (Mechanical, Building and Construction Management) programmes offered by the University of Southern Queensland (USQ), a regional Australian University with excellence in developing e-learning. The paper describes how the authors review the courseware of the course. The needs for the review are also explained. The assessments of the course were also studied and revised. The authors also estimated the costs involved in reviewing the course. At the same time, the paper also predicts the benefits that will be offered to students and the community including employers who are going to employ USQ graduates. It is finally concluded that the review is worthwhile and the actual costs to the university are minimal.  相似文献   
57.
介绍了隐马尔可夫模型及其主要解决的3个基本问题,以及在说话人识别系统中实现的基本过程,并对256和512码本、文本相关与文本无关进行比对,得出文本相关的识别率更高的结论并分析了其原因。  相似文献   
58.
课程开发是对课程整个运作过程的研究。将信息可视化技术引入课程开发研究,可将课程开发中的各种信息条理化和形象化,以直观的视觉效果和易观察性为课程开发提供有效的决策支持。  相似文献   
59.
利用线性规划解决比较复杂的基金增值问题,给出了一种比较简单的算法,得出了最优的基金增值方法。该法算法简单、实用性强、是单位和家庭理财的较理想选择。  相似文献   
60.
INTRODUCTION With the rapid progress in the Internet and ex- panded area of multimedia technology, steganogra- phy and steganalysis as subfields of information se- curity have developed rapidly and drawn more and more attention. Steganography is the art of hiding and transmitting data through apparently innocuous car- riers in an effort to conceal the existence of the secret data (Peticolas et al., 1999). While steganalysis, the countermeasure to steganography, is an art that de- tects ev…  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