基于89C51弹奏电子琴的设计

本文主要阐述利用AT89C51单片机实现可弹奏电子琴的的设计，包括AT89C51的最小系统，矩阵键盘的设计，显示模块的设计以及音符产生的原理和实现，调试效果较好。     

基于单片机的无线遥控系统设计

设计了一种基于单片机AT89C51和无线传输模块FSK_2A构成的多路控制应用系统,论述其工作原理和软硬件设计方法。本设计是以AT89C51单片机为核心,采用315M的发射接收模块来实现多路无线控制,结构简单,电路稳定可靠,抗干扰能力强,有很大的实际应用价值。     

DS18B20在楼宇温度监控系统中的应用

本文以AT89C51单片机为控制核心,利用温度传感器DS18B20测量温度值,实现智能楼宇内环境温度的检测和控制 另外,给出了由AT89C51单片机和DS18B20构成的单总线温度测量系统的硬件电路及软件流程图。系统硬件设计简单,性价比高。     

一种基于AT89C51智能化温度监控系统的设计

本设计是以AT89C51单片机为控制核心设计了一种温度实时测量及控制系统。单片机AT89C51能够根据温度传感器所采集的温度数据来控制温度在设定的范围之内。     

单片机在分布式监控系统中的应用

文章介绍了以AT89C51单片机为主机,利用MAX87接口芯片与多台AT89C2051单片机之间进行多机串行通信,实现分布式监控的设计方法.     

电冰箱数字温度检测仪的设计

介绍了一种采用ATMEL公司的AT89C2051单片机和DALLAS公司的DS18B20数字温度传感器为主要元件，设计的电冰箱数字温度检测仪．该设计方案给出了详细的电路原理图和部分用C51编写的AT89C2051单片机与DS18B20数字温度传感器通信的源程序．     

一种嵌入式单片机系统--GPS网络时钟

为了实现计算机局域网中系统时间的统一，利用AT89C51单片机设计了基于ISA总线的GPS时钟板卡，一台计算机读取GPS时钟板下的时间信息并在局域网中广播发送，为了降低成本和提高性能，此设计为一种嵌入式单片机系统－GPS网络时钟，它由GPS时钟板卡，网卡，以AT89C51为核心具有ISA总线的主板组成，文中给出了硬件原理图及系统测试过程。     

基于单片机的多点温度测量系统的PROTEUS设计与仿真

采用AT89C51单片机作为系统的控制核心,智能温度传感器DS18B20作为测温仪表,采用C语言编程设计了一个多点温度测量系统。首先在PROTEUS上进行该系统的原理图设计,然后在Keil C51上完成系统的程序编写,将PROTEUS与Keil联调,完成该系统的仿真调试,极大地提高了设计的效率。     

基于单片机的智能温控系统的设计与实现

基于单片机的智能控温技术在科学研究、工农业生产、日常生活的很多领域得到了广泛的应用。本文设计了以AT89C51单片机为核心的智能温度控制系统,并结合Proteus仿真平台进行了系统仿真研究,在MedWin3.0集成开发环境中采用C51语言进行系统程序设计。这不仅提高了单片机系统设计的效率,降低了成本,缩短了周期,而且对于单片机系统的教学演示和实际设计都具有很大的应用价值。     

单片机语音处理系统的研制

介绍了利用单片机处理语音的设计思路,语音处理系统硬件设计及软件实现,AT89C51单片机与ISD1420语音组合精灵板硬件的连接。     

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