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基于谱相减改进算法的语音增强研究

铁道学报 2004年第1期26卷 64-67页

作者：徐岩杨静王维汉兰州交通大学信息与电气工程学院甘肃兰州730070

根据传统的谱相减增强型算法 ,提出了抑制噪声的谱减改进算法 ,暨根据带噪语音帧频谱功率与噪声帧频谱功率比值 ,动态调整α、β谱减系数 ,使之谱减效果在较大提高信噪比的同时 ,又能将残留的音乐噪声和语音失真保持在人耳听觉的容忍范... 详细信息

根据传统的谱相减增强型算法 ,提出了抑制噪声的谱减改进算法 ,暨根据带噪语音帧频谱功率与噪声帧频谱功率比值 ,动态调整α、β谱减系数 ,使之谱减效果在较大提高信噪比的同时 ,又能将残留的音乐噪声和语音失真保持在人耳听觉的容忍范围之内 ,保证原始语音信号质量达到一定的可懂度和清晰度。借助MATLAB语言进行试验仿真 ,仿真结果与原算法相比较。

关键词：语音增强谱相减算法噪声抑制

基于MATLAB/PDEtool的轴对称场分析

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铁道学报 2005年第1期27卷 124-127页

作者：张友鹏田铭兴兰州交通大学信息与电气工程学院甘肃兰州730070

MATLAB/PDEtool是非常优秀的二维偏微分有限元求解软件,具有像静电场、静磁场和工频交流电磁场等专业模式,但这些专业模式不能直接用于柱坐标系表示的轴对称场的求解分析。文章推导出了正交坐标系中的泊松方程,并通过柱坐标系中轴对称... 详细信息

MATLAB/PDEtool是非常优秀的二维偏微分有限元求解软件,具有像静电场、静磁场和工频交流电磁场等专业模式,但这些专业模式不能直接用于柱坐标系表示的轴对称场的求解分析。文章推导出了正交坐标系中的泊松方程,并通过柱坐标系中轴对称场的方程形式和直角坐标系中标准二维椭圆型偏微分方程形式的比较,得到了他们坐标之间、系数之间的对应关系,据此用MATLAB/PDEtool对轴对称场进行了求解分析,结果说明本文的方法是有效的。

关键词：平行平面场轴对称场静磁场 MATALAB

Discuss on network course construction of electrical engineering experiment

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Discuss on network course construction of electrical enginee...

第三届教学管理与课程建设学术会议

作者： Yufang Gong, Xinying LI Electronics&information engineering college,lanzhou jiaotong university,lanzhou,china,73.070

The electrical engineering experimental course is one of specialized technology compulsory course of non-electrical undergraduate majors of engineering colleges. One of the main features of this course is that face specialty widely, the number of students is large, combined with the features of the course and present problems, in order to cultivate creative talents as the goal, it reform and explore the teaching methods and means of electrical engineering experiment. Designing the network teaching platform of electrical engineering experiment, the platform increase the flexibility of teaching greatly ,at the same time improve the quality of teaching effectively.

关键词： electrical engineering experiment teaching reformation Network course

Tank Farm Operation Optimization System of Refinery

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Tank Farm Operation Optimization System of Refinery

2010 Chinese Control and Decision Conference

作者： Xiaoqiang Zhao,Weirong Liu college of electrical engineering and information engineering,lanzhou university of Technology,lanzhou 730050

＜正＞According to operation bottlenecks of tank farm,this paper discusses statistical risk simulator program that models the tank farm operation of refinery and covers a ship delay,lifting schedules,unit stream factor,maintenance activities,movement automation,movement planning and scheduling,and adequate field equipment such as tank gauges, flowmeters,and remote control,*** optimization system can create tremendous benefits for refineries.

关键词： Tank Farm Optimization Database

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不确定网络化控制系统的保性能鲁棒容错控制

系统仿真学报 2009年第23期21卷 7544-7548页

作者：李炜李亚洁兰州理工大学电气工程与信息工程学院兰州730050

研究了一类含有不确定性的网络化控制系统的完整性和保性能容错控制问题。基于Lyapunov稳定性理论和LMI方法,采用状态反馈控制策略,针对含有不确定性的网络化控制系统当执行器发生失效故障时分别推证出了系统仍渐近稳定和能够满足一定... 详细信息

研究了一类含有不确定性的网络化控制系统的完整性和保性能容错控制问题。基于Lyapunov稳定性理论和LMI方法,采用状态反馈控制策略,针对含有不确定性的网络化控制系统当执行器发生失效故障时分别推证出了系统仍渐近稳定和能够满足一定控制指标的充分条件,进而通过将矩阵不等式转化为线性矩阵不等式得到了求取两种容错控制器的方法。最后用仿真算例验证了该方法的有效性和可行性。

关键词：网络化控制系统鲁棒容错控制保性能控制线性矩阵不等式

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钢中脆硬粒子裂纹形成机理

物理学报 2004年第2期53卷 571-576页

作者：朱亮张爱华甘肃工业大学甘肃省有色金属新材料省部共建国家重点实验室兰州730050 甘肃工业大学电气工程与信息工程学院兰州730050

钢中的脆硬粒子对钢的解理脆断有直接的影响 ,解理断裂源大都发生在脆硬粒子上 .根据微裂纹形成的热力学模型 ,利用钢中脆硬粒子开裂时所释放的弹性应变能、位错塞积弹性能 ,所产生的表面能 ,对脆硬粒子裂纹形成机理进行分析 .模型计算... 详细信息

钢中的脆硬粒子对钢的解理脆断有直接的影响 ,解理断裂源大都发生在脆硬粒子上 .根据微裂纹形成的热力学模型 ,利用钢中脆硬粒子开裂时所释放的弹性应变能、位错塞积弹性能 ,所产生的表面能 ,对脆硬粒子裂纹形成机理进行分析 .模型计算表明 ,正应力和位错塞积力都是脆硬粒子开裂的必要条件 ,这与实验事实相符 ;同时给出脆硬粒子开裂的临界条件计算方法 ,计算发现 ,脆硬粒子临界开裂应力不仅取决于脆硬粒子尺寸及表面能 ,而且与晶粒直径有一定的相关关系 ,当晶粒直径较小时 ,这种关系与实验测定的材料解理断裂应力与晶粒尺寸的关系一致 ,说明整体失稳解理断裂的控制环节为脆硬粒子开裂 ;当晶粒直径较大时 ,脆硬粒子临界开裂应力就小于材料解理断裂应力。

关键词：钢脆硬粒子解理断裂裂纹形核弹性应变能位错塞积弹性能正应力位错塞积力临界开裂应力

Robust Stabilization Control for a Class of Nonlinear Measure Differential Systems with Delay

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Systems Science and Systems engineering 1998年第1期8卷 18-28页

作者： YUE Dong\ XU Shifan college of information and electrical engineering china university of Mining and Technology Xuzhou, Jiangsu,221008,china)

This paper considers the robust stabilization problem of a class of nonlinear measure differential systems with *** eliminate the effect of nonlinear uncertainties on the stability of a closed loop system, a nonlinear controller is *** addition, to get the stability result of closed loop dynamics, two novel lemmas are *** our approach, we do not require the assumption that the time varying delay variable γ(t) be restricted by (t)<1 , which is often required in many previous papers (e.g,see).

关键词： measure differential systems delay robust control stable

Research progress on electrical signals in higher plants

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Progress in Natural Science:Materials International 2009年第5期19卷 531-541页

作者： Xiaofei Yana, Zhongyi Wang a, Lan Huang a, Cheng Wang b, Ruifeng Hou b, Zhilong Xu b, Xiaojun Qiao b a college of information and electrical engineering, china Agricultural university, Beijing 100083, china b National engineering Research Center for information Technology in Agriculture, Beijing 100097, china [a]college of information and electrical engineering China Agricultural University Beijing 100083 China [b]National Engineering Research Center for Information Technology in Agriculture Beijing 100097 China

This review introduces the characteristics of electrical signals in higher plants and their corresponding physiological significance, and describes in detail the impact of environmental factors (e.g. light and temperature) on the electrical potential of the plants. Also, we evaluate the measurement techniques used for electrical signals in plants, including intracellular measurement, extracellular measurement, measurement of the ion channel based on the patch-clamp technique and on the non-invasive microelectrode vibrating probe technique. We also give a brief review of the applications of these methods for investigating electrical signals in plants. The ionic mechanism of electrical activity in plants is then discussed in terms of environmental response in higher plants, and this is used to provide a theoretical basis for quantitative description of the electrical signals in plants. A model for interpretation of the electrical signal mechanisms in higher plants is discussed, but further experiments are required for the verification of this model.

关键词： Ion channel Temperature-induced Light-induced Ion mechanism Measurement technology

On The Adjacent Vertex-Distinguishing Edge Coloring of Km·Sn1

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On The Adjacent Vertex-Distinguishing Edge Coloring of Km·S...

中国运筹学会第七届学术交流会

作者： Ma Ming Li Jingwen Liu Hua Department of Mathematic,Northwest Minorities university,lanzhou 730030,P.R.china college of information and electrical engineering, lanzhou jiaotong university lanzhou Gansu,73.070,P.R.china

Suppose V(K·S) ={u|i = 1,2,…,m} ∪{v|i = 1,2,…,m;j =1, 2,…, n}, E(K·S) = {uu|i = 1, 2,…, m-1;j = i+1, i+2,…, m}∪{uv|i =1, 2,…, m;j = 1, 2,…, n}. In this paper, we obtained that the adjacent vertex-distinguis... 详细信息

关键词： Graph adjacent vertex-distinguishing edge coloring adjacent vertex-distinguishing edge chromatic number