变结构-模糊复合控制交流位置伺服系统

针对交流位置伺服系统变结构控制存在颤振的不足，提出了据偏差的大小去选择采用变结构控制、模糊控制的复合控制策略，仿真的结果说明了变结构－－模糊复合控制器既保持了变结构控制的快速性及鲁棒性等优点，又消除了颤振现象。     

加强信息网络环境下的图书馆建设

信息网络的迅速发展，对图书馆提出了严峻挑战的同时也带来机遇。图书馆要面对时代变化，不断进行自身建设，才能适应社会发展需要。     

EBF网络特征映射和恢复及其在鲁棒话者识别中的应用

The performance of speaker verification systems is often compromised under real-world environments. For example, variations in handset characteristics could cause severe performance degradation. This paper presents a novel method to overcome this problem by using a non-linear handset mapper. Under this method, a mapper is constructed by training an elliptical basis function network using distorted speech features as inputs and the corresponding clean features as the desired outputs. During feature recuperation, clean features are recovered by feeding the distorted features to the feature mapper. The recovered features are then presented to a speaker model as if they were derived from clean speech. Experimental evaluations based on 258 speakers of the TIMIT and NTIMIT corpuses suggest that the feature mappers improve the verification performance remarkably.     

丙氨酸尾式卟啉及其锌配合物的电化学性质

本文采用循环伏安法研究了 5 -邻 [N - (L -丙氨酸 ) -乙氧基 ]苯基 - 10 ,15 ,2 0 -三苯基卟啉及其锌配合物在CH2 Cl2 为溶剂和TBPA为电解质条件下的电化学性质 .在循环伏安图中 ,两种物质都呈现 4对可逆的氧化还原峰 ,其氧化还原过程仅发生在卟啉的π电子体系上 .同时对其电化学反应机理作了推测     

基于三坐标测量的复杂曲面边界线的获取与构建

提出了利用三坐标测量机测量曲面边界线、获取曲面边界点数据和构建曲面边界线的方法。     

迟子建小说文本的人文关怀

迟子建在叙事艺术上着意经营,擅长以温情的笔调讲述“东北家园”伤怀之美故事,尤其是对童年情结梦忆、生态文学写作、精神生态追怀的书写,独具特色富于美学意味,由此建构了她小说文本的人文关怀,使读者在阅读中分明感觉到她的艺术气质和艺术审美,卓尔不群、非同一般。     

Modeling water and carbon fluxes above summer maize field in North China Plain with back-propagation neural networks

INTRODUCTION Dynamics of carbon and water vapor fluxesexchange between the atmosphere and the ecosystembiosphere, depend on complex and non-liner interplayamong physiological, ecological, biochemical andedaphic factors and meteorological conditions (Jarvis,1995; Leuning et al., 1995). There are many studiesquantifying the fluxes across different time and spacescales as well as assessing the environment con-straints on them by some kinds of biophysical orempirical models whose resul…     

移动自组网AODV多路径路由研究

AODV协议是唯一通过IETF批准成为RFC文档的移动自组网按需控制路由协议．分析AODV路由协议工作过程及优缺点，并介绍了几种典型的基于AODV的多路径路由改进协议，最后对这些多路径协议进行优缺点分析及性能比较。     

复常系数线性齐次微分方程组的解法

本文给出了一种求复常系数线性齐次微分方程组: X~′=(A+iB)X (1)的标准基解矩阵的方法,得到了方程组(1)的通解公式。这里A,B均为n阶实常数矩阵。     

Hybrid ants-like search algorithms for P2P media streaming distribution in ad hoc networks

Media streaming delivery in wireless ad hoc networks is challenging due to the stringent resource restrictions,po-tential high loss rate and the decentralized architecture. To support long and high-quality streams,one viable approach is that a media stream is partitioned into segments,and then the segments are replicated in a network and served in a peer-to-peer(P2P) fashion. However,the searching strategy for segments is one key problem with the approach. This paper proposes a hybrid ants-like search algorithm(HASA) for P2P media streaming distribution in ad hoc networks. It takes the advantages of random walks and ants-like algorithms for searching in unstructured P2P networks,such as low transmitting latency,less jitter times,and low unnecessary traffic. We quantify the performance of our scheme in terms of response time,jitter times,and network messages for media streaming distribution. Simulation results showed that it can effectively improve the search efficiency for P2P media streaming distribution in ad hoc networks.