三明治结构微机械静电伺服加速度计稳定性研究

对影响微加速度计稳定性的主要因素（外置偏压和横向加速度干扰）进行了详细分析，给出了最小临界偏压和最大可随横向加速度的计算公式，提出一种具有良好稳定性的四梁中心悬臂式结构。根据Matlab仿真结果，在大量程微加速度计典型结构参数下，惯性敏感单元可承受的最大横向加速度达2000g以上，远远满足实际需求。     

具有导子的李三系的中心扩张与形变

考虑具有导子的李三系.由李三系和一个导子称为LietsDer对.定义系数在表示中的LietsDer对的上同调理论.研究LietsDer对的中心扩张.接下来,将形变理论推广到由李三系和导子构成LietsDer对上,它由带有系数的LietsDer对的上同调所支配.     

某一类控制系统中发生的指数偏差现象

我们考虑在某类控制系统中,以Lyapunov指数作为观测量,远离给定遍历测度的那些周期测度.对于这类周期测度的数量关于周期的指数增长率,我们将用测度熵在某个集合上的上界给出它的一个上限控制.     

Combining clustering and classification for remote-sensing images using unlabeled data

A joint clustering and classification approach is proposed.This approach exploits unlabeled data for efficient clustering,which is applied in the classification with support vector machine(SVM) in the case of small-size training samples.The proposed method requires no prior information on data labels,and yields better cluster structures.Through cluster assumption and the notions of support vectors,the most confident k cluster centers and data points near the cluster boundaries are labeled and used to train a reliable SVM classifier.Our method gains better estimation of data distributions and mitigates the unrepresentative problem of small-size training samples.The data set collected from Landsat Thematic Mapper(Landsat TM-5) validates the effectiveness of the proposed approach.     

一种基于多特征融合的新型光谱相似性测度

光谱相似性测度是高光谱遥感影像定量化分析和精细地物直接识别的基础,光谱特征的选择和刻画方式是光谱相似性测度的关键.研究表明,利用光谱的单一特征无法全面反应地物光谱间的相似性,光谱识别时需要综合考虑光谱的多种特征.本文在几何距离、相关系数和相对熵的基础上提出了一种结合多种光谱特征的新型光谱相似性测度,即光谱泛相似测度(s...     

Z 2-equivariant cubic system which yields 13 limit cycles

For the planar Z_2-equivariant cubic systems having two elementary focuses,the characterization of a bi-center problem and shortened expressions of the first six Lyapunov constants are completely solved.The necessary and sufficient conditions for the existence of the bi-center are obtained.On the basis of this work,in this paper,we show that under small Z_2-equivariant cubic perturbations,this cubic system has at least 13 limit cycles with the scheme 16∪6.     

Altman、Krasnoselskii和Petryshyn定理的推广

利用不动点指数方法,本文借助于凸函数在内积空间中研究一类半闭1-集压缩算子方程解的存在性,获得了一些新的结果,推广Altman、Krasnoselskii和Petryshyn定理,并改进了相关文献中的结果.最后,我们给出主要结果的一个应用.     

LIMIT CYCLES BIFURCATION FOR A CLASS OF DEGENERATE SINGULARITY

In this paper, bifurcation of limit cycles for the degenerate equilibrium to a three- dimensional system is investigated. Firstly, we use formal series to calculate the focal values at the high-order critical point on center manifold. Then an example is studied, and the existence of 3 limit cycles on the center manifold is proved. In terms of high- order singularities in high-dimensional systems, our results are new.     

上海市上南中学简介

<正>上海市上南中学创办于1963年,1986年被评定为区重点中学,现有36个教学班,146名教职员工,1500余名在校学生。学校师资力量雄厚,教学质量优良,拥有20多名市、区学科带头人、骨干教师、学科中心组成员,80%以上的教师具有高、中级职称。2013年9月,上南中学整体搬进了设施先进、环境优美的新校园。学校迎来新的发展机遇。五十年来,上南中学秉承"爱国、科学、人文"的办学理念,形成了"求实、和谐、进取、创新"的纯朴校风和"诚于做人、恒于学问"的良好学风。学校重视学生     

Generalized area operators on L^p（R^n）

We introduce the generalized area operators by using nonnegative measures defined on upper half-spaces R＋^n＋1. The characterization of the boundedness and compactness of the generalized area operator from LP（]Rn） to Lq（IRn） is investigated in terms of s-Carleson measures with 1 〈 p, q 〈 ＋∞. In the case of p = q = 1, the weak type estimate is also obtained.