基于蒙特卡罗方法的数字通信系统性能分析

结合数字通信系统的调制解调理论,按照蒙特卡罗的思想原则对数字通信系统进行建模仿真,可以短时、高效地分析影响数字通信系统性能的因素．文章分析了蒙特卡罗建模的思想,建立了基于蒙特卡罗思想的8PSK数字通信系统,应用MATLAB语言编程,分析了8PSK数字通信系统的误码率．通过仿真结果与理论值对比,验证数字通信系统的信噪比对误码率的影响．     

程序语言智能出题系统的设计与实现

系统地介绍了在ＰＣ系列机上实现的程序语言智能出题系统ＰＩＴＳ．给出了该系统的设计思想、总体结构和基本功能，对系统实现中若干重要问题进行了讨论．本系统设计原理思想及实现方法可推广到智能计算机辅助教学及其应用中．     

重型越野车驱动桥智能设计系统

阐述了重型越野车驱动桥智能设计系统的设计思想、组成结构及其实现方法，并简单地介绍了该系统的主要功能．该系统是一个运用并行工程思想，借助于面向装配的设计方法，基于计算机网络的智能ＣＡＤ系统．它能自上而下地实现重型越野车驱动桥设计的全过程     

结合OPT与MRPⅡ思想的生产计划系统研究

结合ＯＰＴ与ＭＲＰⅡ思想,提出了一种适用于面向订单生产,多品种、小批量离散型生产方式的生产计划系统,及其实现方法．在该系统中,以按期交货为计划编制的优化目标,事先划分关键件与非关键件,采用定单跟踪的技术编制关键件生产计划,合理使用企业资源,以提高企业供货信用．在本文思想指导下的原型系统已开发．     

基于局域网的交互系统结构分析与设计

针对局域网的特点,开发了一个基于局域网的支持同步与异步方式的实时交互系统,给出该系统的设计思想、系统功能结构及数据库结构设计．对实时交互系统用于网络学习的效果进行了分析．     

高等数学的思想方法及教学建议

从高等数学教育改革的角度,论述了加强数学思想方法教学的必要性和重要性．系统总结了高等数学中的基本数学思想方法和常用的数学思维方法．并提出了加强数学思想方法教学的几点建议．     

基于J2EE结构的在线答疑系统

将J2EE结构应用于在线答疑系统的设计实现上，使其成为一个分布式的跨平台系统．本文介绍了在线答疑系统的设计思想、系统组成，并给出了基于J2EE的系统框架．     

静压式油罐计量系统

论述了静压式油罐计量系统的工作原理、设计思想、测量精度及实用特点．该系统可应用于石油化工行业进行油罐自动计量．     

通用大型显示系统的设计与实现

介绍一种由ＰＣ机、ＭＳＣ－５１系列单片机及显示单元板构成的通用大型显示系统．讨论了整个应用系统的工作原理、软硬件设计思想及其设计过程．     

高校综合信息统计管理系统

本文介绍了高校综合信息统计系统的设计思想和系统功能，阐明了该系统的特征．实际应用表明，该系统性能优良，具有应用推广价值．     

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     

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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