2n端口旋转器和反照器的级联与直积构造

证明了2n端口线性变换器能分解为2n端口旋转器、变标器和反照器的适当组合的级联.提出用二端口旋转器和反照器传输参数矩阵直积构造2n端口旋转器和反照器传输参数矩阵的方法.     

(p q)端口回转器综合分段线性n端口电阻器

提出（ｐ＋ｑ）端口回转器综合分段线性ｎ端口（电流控制电压型ＣＣＶ和电压控制电流型ＶＣＣ）电阻器,用（ｐ＋ｑ）端口回转器综合分段线性ｎ端口电阻器比用（ｐ＋ｑ）端口变压器综合具有较大的优越性     

一种支持USB和以太网端口的数据采集器设计

为了将采集的数据传输给具有不同通信端口的工业终端,设计了一种支持USB和以太网端口的数据采集器.该数据采集器由数据采集、传输模块和PC机图形用户界面（GUI）软件模块组成,采集与传输模块采用双C8051F340处理器架构,采集的数据分别实现了USB传输和以太网传输,基于LabVIEW的GUI软件通过上述端口获取数据并进行波形显示.实验表明,该数据采集器支持两种端口,具有多种工作模式,以波形方式直观显示采集数据.     

n端口网络的互易定理

文章根据特勒根定理推导出n端口网络的互易定理，从而得到互易定理的普遍形式，推广了这一重要定理。     

直流 n 端口网络的最大功率传输问题

本文从直流含源一端口网络负载吸取最大功率的必要条件出发,导出了直流含源 n 端口网络向负载提供最大功率的必要条件。并以直流二端口网络为例来说明具体的计算方法。     

一种新的基于PRM的多端口微波器件测量方法

端口还原法(PRM)是一种通过多组端口接负载的n-1端口的散射矩阵获得n端口散射矩阵的方法。通过这种方法可以减少对测试仪器的校准过程。当n端口的微波器件通过端口接相应的负载降低为两端口微波网络时,两端口的散射矩阵可以通过传统的两端口矢量网络分析仪测量获得。但是传统的PRM方法需要三种相应的端口负载,本文提出的新型PRM测量方法只需要两种相应的端口负载,使PRM算法更加简化。仿真结果显示该PRM算法具有良好的精度。此外,该算法比使用理想负载的两端口网络分析仪测量结果更准确。     

浅析计算机端口

本文介绍了计算机端口的分类以及端口的重定向、怎样查看和关闭计算机的端口,为计算机的安全管理提供了一个重要的方法。     

严防端口攻击

随着网络技术的发展,黑客技术也日益发展,黑客们用的较多的仍然是利用端口进行攻击。因此认识端口,了解端口是防范黑客维护系统的必然。在认识了解的基础上,才能做到端口应用自己做主。让我们一步一步开始防御:第一步:了解端口分类:计算机端口有65535个,常用的端口只有几十个,更多的是未定义端口。因为未定义端口不容易引起注意,黑客往往利用这类端口进行攻击。因此,了解端口及其分类是防范黑客的第一步。以性质划分,端口有以下三类:(1)公认端口(WellKnownPorts):也称为“常用端口“。端口号从0到1024,紧密绑定于一些特定的服务。例如:80端口总是为HTTP协议所用,23号端口总是为Telnet服务所用。黑客一般不会利用这类端口进行攻击。(2)注册端口(RegisteredPorts):端口号从1025到49151,松散地绑定于一些服务,并且多数没有明确地定义服务对象。这类端口的应用可根据需要自己定义,因此,这类端口比较容易被黑客利用。(3)动态和/或私有端口(Dynamicand/orPrivatePorts):端口号从49152到65535。这类端口既非公用也非注册,应用上很自由。虽然理论上常用服务不会分配...     

用单六端口反射计测量二端口网络参数

本文提出了一种用单六端口反射计测试可逆与不可逆二端口网络散射参数的方法。并用八毫米波段的实验结果证实了该方法的可行性。     

计算机端口简介及其应用

本文简要介绍了计算机端口的相关知识以及端口黑客技术中的应用。     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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