计算非线性问题的分歧解

对一类二阶非线性微分方程的正解进行了进一步的研究,考虑正解为退化的奇异解时,利用非线性泛函分析知识和分歧理论方法,首次推导论证了一个积分公式E(α),并得出它的具体数值符号可以判断解曲线在相平面(λ,u)中的转向情况.     

中立型随机线性随机大系统的稳定性

讨论了时滞中立型线性随机系统的平凡解的几乎渐近稳定性,建立了确定时滞中立型线性随机系统解的极限集位置的充分条件,并应用到时滞中立型线性随机大系统的几乎渐近稳定性的分析中,得到了大系统渐近稳定的代数判据.     

A high performance frequency offset estimator for OFDM

INTRODUCTION Orthogonal frequency division multiplexing (OFDM) has become a promising technology for future wireless communication systems (Kim et al., 2003; 3GPP TSG-RAN-1.TR, 2004) due to its ability to transform a wideband frequency selective channel to a set of parallel flat-fading narrow-band channels, which substantially simplifies the channel equaliza- tion problem. However, a critical weakness of OFDM is its sensitivity to carrier frequency offset (CFO) since it can only t…     

常系数齐次线性方程临界情形与零解不稳定的几则判据

本文应用霍维茨(Hurwitz)行列式和霍维茨定理、给出了一些n次实系数多项式存在正实部根、均具有正实部根和存在零实部根的条件,从而为常系数齐次线性方程的零解不稳定性、是否属于临界情形提供了有用的判别依据。     

一类迭代微分方程解的存在性与唯一性

研究了一类迭代微分方程解的存在性与唯一性问题,给出了存在唯一性定理,推广了已有的结果.     

微分中值定理及其应用

运用推广与收缩的观点阐述了微分中值定理之间的关系,讨论了微分中值定理在微分学中的地位与作用,介绍了微分中值定理在解题中的应用.     

辛钦定理证明一类广泛的重积分极限

用辛钦定理证明了一类广泛的重积分极限恒等式并给出几个应用实例.这体现了概率的思想方法在解决分析学中复杂问题的简洁性和独特性.     

一类四阶两点边值共振问题解的存在性

运用Mawhin延拓定理,在一定条件下讨论一类四阶两点边值共振问题的存在性.     

一类p-Laplacian差分方程两点边值问题正解的存在性

利用Krasnoselskii锥压缩和拉抻不动点定理获得了一类p-Laplacian差分方程两点边值问题正解的存在性.     

The prime ordeal

Prime numbers have fascinated mankind through the ages. In fact, one may think that we know all about them. However, this is not so! One does not know the answers to many basic questions on primes. We shall concentrate here mainly on questions and discoveries whose statements are elementary and accessible. Right at the end, we mention a result whose statement is simple but whose proof uses rather sophisticated mathematics. Even here, we do not try to be exhaustive. The subject is too vast for that to be possible. After a long stint (1981–1999) at TIFR, Bombay, B Sury moved to ISI, Bangalore.