全文获取类型
收费全文 | 393篇 |
免费 | 4篇 |
国内免费 | 8篇 |
专业分类
教育 | 353篇 |
科学研究 | 25篇 |
体育 | 2篇 |
综合类 | 25篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 1篇 |
2015年 | 3篇 |
2014年 | 25篇 |
2013年 | 20篇 |
2012年 | 19篇 |
2011年 | 23篇 |
2010年 | 20篇 |
2009年 | 21篇 |
2008年 | 30篇 |
2007年 | 43篇 |
2006年 | 27篇 |
2005年 | 25篇 |
2004年 | 20篇 |
2003年 | 20篇 |
2002年 | 17篇 |
2001年 | 26篇 |
2000年 | 15篇 |
1999年 | 7篇 |
1998年 | 6篇 |
1997年 | 7篇 |
1996年 | 5篇 |
1995年 | 3篇 |
1994年 | 7篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
排序方式: 共有405条查询结果,搜索用时 15 毫秒
71.
72.
Interior-point methods (IPMs) for linear optimization (LO) and semidefinite optimization (SDO) have become a hot area in mathematical programming in the last decades. In this paper, a new kernel function with simple algebraic expression is proposed. Based on this kernel function, a primal-dual interior-point methods (IPMs) for semidefinite optimization (SDO) is designed. And the iteration complexity of the algorithm as O(n^3/4 log n/ε) with large-updates is established. The resulting bound is better than the classical kernel function, with its iteration complexity O(n log n/ε) in large-updates case. 相似文献
74.
本文借助于数域P上的n次多项式的齐次分解,证明了线性空间P[X1,X2,…Xn]m的维数等于Cn+m^n并给出了该空间的一组基;进而得到R^n上次数不超过m的多项式向量场的全体构成的线性空间V的维数等于n·Cn+m^n。 相似文献
75.
76.
To solve the Fredholm integral equations of the second kind, a new notion of the least-squares orthogonal polyno- mials of function-valued Pade-type approximation is introduced. On the basis of the error formula, the least-squares function: valued Pad&type approximation is constructed. Their existence and uniqueness are studied. A recursive computation formula of the least-squares function-valued Padetype approximation is given. In the end, an example is given to show that the method is effective and stable. 相似文献
77.
收集整理现在常用的高等代数与线性代数材料中与给定矩阵A可交换的矩阵所构成的全矩阵空间Pn×n的子空间C(A)的习题,指出CA的交换性及用A的多项式表示问题同C(A)的维数与n有密切关系,得到n(n叟3)阶幂等矩阵A或对合矩阵A的CA都是不可交换的结论。 相似文献
78.
杨瑛 《玉溪师范学院学报》2012,28(8):67-69
在中学数学教学实践中介绍数学软件Mathematica的知识及其应用,可以丰富中学数学教学内容,激发学生学习数学的兴趣,帮助学生提高对数学的理解能力、动手能力,同时对培养学生的科研实践能力也具有现实意义. 相似文献
79.
特征多项式是多项式和线性代数联系的纽带,是高等代数学习中重点和难点。从矩阵的特征多项式与最小多项式的定义出发,基于它们的最基本性质,对两者之间的关系进行了分析探讨并得到了一些有益的结论。 相似文献
80.
Jordan Santos-Concejero Ross Tucker Cristina Granados Jon Irazusta Iraia Bidaurrazaga-Letona Jon Zabala-Lili 《Journal of sports sciences》2013,31(9):853-859
AbstractThis study investigated the influence of the regression model and initial intensity during an incremental test on the relationship between the lactate threshold estimated by the maximal-deviation method and performance in elite-standard runners. Twenty-three well-trained runners completed a discontinuous incremental running test on a treadmill. Speed started at 9 km · h?1 and increased by 1.5 km · h?1 every 4 min until exhaustion, with a minute of recovery for blood collection. Lactate–speed data were fitted by exponential and polynomial models. The lactate threshold was determined for both models, using all the co-ordinates, excluding the first and excluding the first and second points. The exponential lactate threshold was greater than the polynomial equivalent in any co-ordinate condition (P < 0.001). For both models, the lactate threshold was lower when all co-ordinates were used than when the first and the first and second points were excluded (P < 0.001). 10-km race pace was correlated with both the exponential and polynomial lactate thresholds for all the co-ordinate conditions (r ≥ 0.75, P < 0.001 and r ≥ 0.56, P < 0.05, respectively). The results suggest that the exponential lactate threshold should be used instead of the polynomial equivalent since it is more strongly associated with performance and is independent of the initial intensity of the test. 相似文献