EDA软件MultiSIM 8在电子技术实验中的应用

本文介绍了一种EDA工具——Multisim真软件,通过实例说明了使用Multisim 8软件进行电子技术实验仿真分析的方法,讨论了Multisim 8电子仿真软件在电子技术实验中的应用。     

基于saber的电压源仿真设计

基于saber仿真软件设计的一种稳压电源,也是一种基于集成电流控制型脉宽调制芯片UC3842、采用反激式变换的拓朴结构的自适应直流电源。它主要是通过检测负载的电流变化,来改变PWM输出的占空比,用以驱动MOSFET管,实现恒压输出,采用改变UC3842内部集成运算放大器的基准电压来实现可调的功能。     

基于UC3842的单端反激开关电源设计

本文介绍了一种基于UC3842的开关电源的设计与实现。首先阐述了UC3842的构成和原理;在此基础上,文章提出了具体的设计方法,并重点论述了变压器和缓冲电路等电路的参数设计。     

采用新型脉宽调制器UC3842的开关电源电路及其应用

本文设计一种采用新型脉宽调制器UC3842的开关电源电路,并介绍了它在便携式电子冷温箱中的应用     

基于Cadence的UC1864电路设计与仿真

UC1864是一种高性能的脉频调制型开关电源控制器,应用广泛。本文利用电子电路仿真设计软件Cadence,对UC1864的各个电路模块进行了设计、仿真,并完成了UC1864电路的整体设计与仿真。其仿真结果表明,所设计的电路复合功能要求,为今后同系列电源管理电路的开发奠定了基础。     

脉宽集成控制器UC3842在开关电源中的应用

介绍一种脉宽集成控制器UC3842的工作原理、特点,并给出其在开关电源中的应用。     

剖析有线电视网络中开关电源的UC3842原理与应用

剖析电流控制型脉宽调制器UC3842的原理及特性;分析开关电源的工作原理;并利用电流型PWM控制器UC3842设计开关电源;指出在有线电视系统中开关电源的应用。     

基于Multisim10的数字电路设计与应用

简述了Multisim的基本功能和仿真的方法,并结合实际的数字电路,介绍了Multisim仿真软件在数字电路课程上的应用,利用Multisim仿真软件强大的电路仿真功能,可以灵活、高效地进行电子电路设计,克服了传统实验教学的局限,为我们提供了一种全新的教学辅助手段和方法。     

基于Multisim10的MC1496调幅电路仿真及分析

介绍了在Multisim10仿真平台中构成集成电路模块的方法,并基于Multisim10仿真软件,对模拟乘法器MC1496构成的调幅电路进行仿真.依据仿真原理电路设计实物电路进行测试.并对仿真结果和实际电路测试所得数据进行分析比较.     

电流控制型脉宽调制器UC3842及其应用

介绍了电流控制型脉宽调制器UC3842的原理及优良特性，指出其使用中应注意的问题，讨论了它在有源箝位反激变换器中的应用。     

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.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

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