瞬态信号波形提取的子波变换方法

提出了一种把子波变换与假设检验结合起来从噪声中提取有用瞬态信号波形的方法。先对瞬态信号加高斯噪声的混合信号进行离散子波变换得到了子波系数，根据假设检验理论确定门限，把子波系数与门限进行比较，如果子波第数大于门限，则保留这些子波系数，否则置为零。     

声卡在检测中低频信号中的应用

用声卡模拟示波器是对声卡功能的扩充，在自动化控制中，检测低频率信号波形、可广泛 基技术，介绍了该项技术的硬软件实现过程。     

一种基于子波的信号复原方法

提出了一种从强噪声中复原瞬态信号的新方法，该方法将要复原的瞬态信号表示成一组子波函数的线性组合，在最小均方能量准则下，用共轭梯度算法求解子波函数的线性组合的幅度、尺度和延时参数，计算机模拟结果表明，该方法的实现结构可表示成具有子波非线性，并且类似于辐射函数ＢＰＦ的人工神经元网络。     

用于中频治疗仪的调制信号发生器的设计

该文应用单片机控制技术及D/A转换器的特性,实现了中频治疗仪的低频调制信号发生器,可以使中频治疗仪产生低频调制任意调幅波形输出,由于不同波形对人体穴位的作用效果不同,因此具有很高的研究与使用价值.     

DSS—1电生理信号采集,处理系统的设计

本文介绍利用ＰＣ机、８０９８单片机等构成的系统实现刺激信号的输出和对电生理信号的放大、采集、处理的功能。     

完备正交积分变换下的信号重构

通过对香农(Shannon)采样理论的进一步研究,得到在完备正交积分变换下由离散采样值重构连续信号更一般的采样理论及其推论.通过选择其中不同的正交函数K(x,t),可以得到不同的积分变换式和不同的信号f(t)重构式,而香农采样定理仅是这种采样理论的特例.     

一种新型正弦信号发生器的设计

介绍一种基于TMS320C54X系列的DSP为核心的正弦信号发生器的设计原理和实现方法。由于该系列DSP具有高速的运行速度和灵活的操作性，更加的适合快速算法的实现。该方案所产生的正弦波波形清晰，具有稳定的运行速度和效率很高的指令集，稳定性好。     

基于信号奇异性的干扰信号识别方法研究

从信号处理的角度对无线电引信干扰信号的识别理论进行研究，研究表明无线电引信信号在受到干扰后，振荡器的震荡信号和多普勒信号会产生奇异性，根据信号的奇异性首次提出了基于信号的奇异性的干扰信号识别理论，它可以更好地对干扰信号进行检测和识别。     

PAL信号中亮度和色度信号的数字分离

本文介绍PAL全信号中亮度和色度信号的数字分离的原理和方法,并对各种方法进行了分析和比较。这些方法已用于34Mb/s数字电视编码压缩设备中。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with