Multisim在电路理论教学中的应用

本文将Multisim软件引入电路理论教学之中,简介电路仿真软件Multisim的基本概念及特点,通过实例探讨了Multisim在电路理论教学中的应用,阐述其在教学实践中相较于传统教学手段的优势。弥补电路教学硬件条件的不足,提高电路教学质量。     

Protel 99Se仿真在电子技术教学中的应用

在电子技术教学过程中引入电路仿真环节对电路进行实时分析,不仅可以提高学生的学习兴趣,而且能够加深学生对理论知识的理解。本文阐述了Protel 99SE电路仿真的主要特点,通过对单稳态电路进行电路仿真,突出了教学过程应用软件仿真的优越性。     

Pspice仿真二阶电路的零输入响应

本文针对学生对二阶电路的过渡过程的学习比较困难,探讨了采用理论分析和软件仿真相结合的教学方法。在严格的理论分析基础上．应用Pspice电路仿真软件对二阶电路的零输入响应进行仿真,研究了电路的参数对过渡过程的影响,并同理论分析的结果对照。我们发现,把电路仿真软件引入电子电路教学中,有助于加深学生对基础理论的理解,提高了分析和解决问题的能力,以及培养学习专业基础课程的兴趣。     

运算放大器理论与实践教学中的若干问题研究

重点分析了运算放大器这一基本电子元器件在理论教学与实践教学中的差异化问题.利用电路仿真软件Multisim10对运算放大器电路进行了仿真,并且对实际电路进行了参数对照测量.最后,基于实验结果,本文对运算放大器的理论与实践教学问题进行了分析阐述,并给出了可行的教学方案.     

基于PSpice的稳压电源仿真分析

应用PSpice8．0对串联型直流稳压电源进行了较全面的仿真，结果表明此电路能稳定输出电压。从仿真实验中体会到电路仿真能有效提高电路实验教学的广度和深度，对电路理论教学也很有裨益。     

Multisim2001在电路分析教学中的相关应用

本文以《电路分析》的教学为基础,阐述了仿真电路的机理与优势。通过应用Multisim2001解决实际电路问题,并进行了电路仿真演示。说明在传统教学中恰当融入现代计算机模拟仿真技术,可以使教学变得更加直观、形象,且在理论与实际之间起到了很好的桥梁作用。     

计算机仿真技术在数字电路教学中的应用

本文通过对计数器电路实例的仿真分析,论述了应用NI公司的Multisim10进行电路教学的实践过程。Multisim10能够实现电路仿真设计、电路版图设计、单片机仿真,具有广泛的元器件库、种类齐全的虚拟电子设备、全面的电路分析工具,能够提供虚拟实验室环境,在电子专业课程学习、单片机学习、以及工程设计中有广泛的应用价值,本文对实践教学和工程设计有一定的指导作用。     

应用Proteus仿真技术优化电类专业课堂教学

Proteus是一种交互式的、可视化的电路仿真软件。在《电工基础》和《电子线路》课堂教学中合理地运用Proteus软件的仿真技术可以使抽象、乏味的理论教学变得生动、直观,提高教学效果。本文根据作者的课堂教学实践,介绍了Proteus在《电路基础》和《电子线路》理论教学中的应用方法和一些实例。     

Multisim仿真与《模拟电子技术》教学

电路仿真是巩固电路理论学习的一种重要方法,是一种锻炼学生分析与解决实际问题能力的一种重要途径。本文针对《模拟电子技术》课程教学中学生难以深入理解模拟电路概念和理论的问题,提出使用Multisim仿真强化教学质量。通过模拟电路教学中的难点问题-负反馈放大电路的仿真教学实践,证明了仿真教学的优势。     

浅析仿真教学提高学习电路基础课的兴趣

教学过程中由于受条件限制,无法用实验将某些电路展示给学生看,仿真可以仿真实验室内所有的电路实验。从仿真教学学习电路基础课的意义,对学生学习后续课程及从事专业技术工作所起的作用,阐述了电路仿真在学习电路基础课中的具体应用,从而激发学生学习电路基础课的兴趣,提高教学质量。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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