基于VC与Matlab的电力电子技术软件实验平台设计

针对当前"电力电子技术"的教学环境和软件实验平台存在的不足,介绍了利用VC中的MFC和M atlab混合编程开发的电力电子技术仿真实验平台,给出了实现方法、用软件建立电路模型的依据及仿真实验平台的构成。通过验证该仿真软件在用于理论教学中可提高学生对波形分析的能力。     

基于VC和Simulink的电力电子仿真实验平台设计

对单纯用高级语言编程完成仿真平台设计,编程复杂,开发周期长,而仅仅利用Matlab环境构建仿真平台,其界面功能有很大局限性的问题,提出VC程序与Matlab环境一起构成"以电力电子器件和变换器仿真模型为对象的软件实验平台".该实验平台通过Visual C 6.0编程,将软件界面与Simulink仿真模型整合在一起,通过Matlab引擎对Simulink仿真模型进行控制,对整流、逆变等多种典型的电力电子器件和变换器进行仿真非常方便.可任意添加新仿真模型扩充仿真内容,也可通过设置或修改参数观察参数变化对仿真结果的影响,具有动态仿真效果,为研究电力电子器件和变换器的工作特性提供了有力支持.实验平台为电力电子系统的设计与实现提供了新的思路和方法,可有效缩短系统开发周期.     

城市公交虚拟仿真实验教学资源建设

为使学生更好地掌握城市公交运行过程及其演化规律,开展城市公交虚拟仿真教学资源建设十分必要.该文以"实验技能、创新能力和科研素质"培养为建设目标,以"学生为中心"教育理念为指导,围绕教学体系、实验项目、管理体系等3个方面阐述了城市公交虚拟仿真教学资源建设的主要内容,并介绍了虚拟仿真平台建设的关键技术.通过对该教学资源的建...     

《电力拖动控制系统》虚拟实验平台的开发

针对《电力拖动控制系统》实践教学中存在的问题和学生的不同层次需求,利用MATLAB的图形用户界面开发工具和仿真工具箱,开发电力拖动控制系统的虚拟实验平台.虚拟实验平台由验证性实验、综合性实验、设计性实验和开发性实验组成,不仅能有效扩展实验空间和时间,加强实验内容的深度,提高学生综合运用知识能力和创新能力,而且也可作为科研、设计和分析的重要工具.     

应用实时仿真软件开发电力电子系统的几个实验项目

传统的电气教学实验由于安全考虑、设备的限制及其固有的设计模式,只能完成教学中几个固定的实验操作,很难扩展到课堂上涉及的所有交直流调速系统和电力电子系统。而实时仿真平台使用实际硬件控制器,能够更好地培养学生的动手能力,更对培养学生的设计能力和创新意识、操作能力和分析调试能力有利。以Boost电路实验、光伏系统MPPT实验、永磁同步电机矢量控制实验为例结合教学的实验内容、目标介绍了实时仿真实验过程。电力电子技术课程设计借助实时仿真平台有很大的教学灵活性,更有利于学生得到接近实际情况的学习体验。适应卓越工程师和创新型人才的培养需要,提供产、学、研一体化的校企合作平台。     

基于MATLAB GUI的电力电子技术虚拟实验仿真平台的设计与构建

电力电子技术课程具有实用性强、理论与实践并重的特点,为解决教学中理论与实践脱节的现象,该文利用MATLAB图形用户界面GUIDE,设计了一种电力电子技术虚拟实验仿真平台。该平台包括登录界面、电路选择界面及仿真界面等,通过以上人机交互界面,实现对多种电力电子电路的仿真。实践表明,该平台可以对电路参数进行设置和修改,以图形化显示实验结果,直观反映参数改变对仿真结果的影响,且具有学生自主创建器件库的功能,可自主搭建电路并实现综合创新实验的仿真。     

基于核典型相关分析的教学资源推荐算法

为了提高在线学习平台教学资源推荐的有效性,通过数据挖掘方法对OBE教学资源进行特征提取,分别生成教学资源和用户个性推荐库,采用核典型相关分析算法对教学资源特征和用户个性特征进行分析,选择相关系数高的教学资源推荐给用户.实例仿真证明,相比于常用的教学资源推荐算法,本文算法的准确度更高,推荐资源更精准.     

微机原理网上实验系统架构

为了解决目前学校扩大招生引起的设备到师资等各种教学资源的紧张,有必要构建虚拟实验室。由Internet辅助教学的理念,提出了构建微机原理网上虚拟实验室的概念。用户通过对浏览器的操作,在管理平台上完成对教学的管理;在由硬件仿真实验和代码分析器组成的虚拟实验平台上,与虚拟实验对象之间进行交互,完成实验。该系统能够减少学校实验室建设投入、提高学生实验能力、有利于实验管理信息化。     

微机原理网上实验系统架构

为了解决目前学校扩大招生引起的设备到师资等各种教学资源的紧张,有必要构建虚拟实验室.由Internet辅助教学的理念,提出了构建微机原理网上虚拟实验室的概念.用户通过对浏览器的操作,在管理平台上完成对教学的管理;在由硬件仿真实验和代码分析器组成的虚拟实验平台上,与虚拟实验对象之间进行交互,完成实验.该系统能够减少学校实验室建设投入、提高学生实验能力、有利于实验管理信息化.     

随机信号分析远程虚拟实验平台开发

随机信号分析是通信工程专业必修课,但其概念抽象难懂,导致学生学习困难,积极性低。开发了一套随机信号分析远程虚拟仿真实验平台,通过网络实验加深学生对课程的理解,提高学习积极性,培养学生实践能力和分析解决问题能力。远程虚拟实验平台采用浏览器/服务器(B/S)模式,通过MATLAB Web Server代理,使学生可通过浏览器在网络环境下调用进行远程虚拟实验。基于MATLAB Web Server的虚拟仿真实验系统利用了HTML语言方便编写的特点,使学生无需安装MATLAB即可完成实验,降低了教学资源,提高了学生进行实验的时间、地点的灵活性。     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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