基于Multisim2001仿真软件的移相电路设计与仿真

该文章介绍一种EDA(电子设计自动化)仿真软件Multisim2001的仿真功能的特点,并以移相电路设计为例说明了用Multisim进行电子电路的设计与仿真分析的具体方法,简单介绍了如何设置参数和进行仿真操作。     

数字逻辑电路教学探讨

Multisim是一种电子电路计算机仿真设计软件，它被称为电子设计工作平台或虚拟电子实验室。文章阐述了Muldsiln软件的主要特点，通过彩灯控制电路介绍Multisim在数字电路课程教学中的辅助作用。Multisim可以提高数字电路课程教学效果。     

基于Multisim2001的汽车尾灯电路设计

Multisim2001是一款电子电路计算机仿真设计软件,本文借助此软件设计汽车尾灯控制电路,实现汽车正常行驶、左转弯、右转弯、刹车条件下汽车尾灯的点亮与熄灭情况。仿真结果表明该电路可实现汽车尾灯控制功能。与传统电子设计相比,利用此软件进行设计具有降低成本、缩短开发时间等优点。     

EDA工具软件Multisim2001在功率放大器设计中的应用

以功率放大器电路设计为实际例子,研究了EDA工具软件Multisim2001在电子设计中的应用情况．研究结果表明,传统的设计方式与EDA技术的有机结合,会形成一种优越的创新性电子设计方式．     

基于Multisim2001的组合逻辑电路分析与设计

介绍了电路设计仿真软件Multisim2001功能和特点。并以组合逻辑电路的设计和分析为例，说明了用Multisim2001在数字电路的仿真分析方法。实例表明，使用Multisim2001不但提高了分析和设计效率，而且有助于提高学生的兴趣，培养创新能力。     

基于EDA技术的智能机器猫的仿真及设计

EDA技术是电子设计的发展趋势,是电子信息技术发展的杰出成果。尤其是Multisim电路仿真软件和Ultiboard印制板设计软件的出现,将EDA技术提高到了一个更高的水平。系统选取了一种简易的电池驱动玩具——电动机器猫,并利用EDA开发工具Multisim9和Ultiboard软件进行设计仿真,将其改装成能进行一定智能控制的电动玩具。     

基于multisim9的电子电路计算机仿真分析与应用

主要介绍了Multisim9软件进行电路仿真与传统电路设计相比较的特点,以及使用Multisim9仿真软件进行电路仿真的方法。以负反馈放大电路和模,数、数／模转换电路为例,阐述了使用虚拟电子实验平台进行模拟电路和数字电路仿真分析的具体方法。并将结果与理论分析相比较,从中可以看出电子设计仿真技术方便、高效的特点。基于计算机仿真技术的电子电路的分析与设计将完全取代传统的电路设计分析方法．实现电子设计的自动化。     

基于Multisim 2001音调控制电路的设计

本文介绍音调控制电路的工作原理及Multisim 2001仿真软件的特色,并用Multisim 2001仿真软件对所设计的电路进行仿真,并对仿真数据进行了分析。     

基于Multisim的速度可调节日彩灯控制电路设计与仿真

以Multisim软件为平台设计速度可调七路节日彩灯控制电路。对振荡电路、驱动电路设计作了详细介绍,使用虚拟元器件完成了总体电路的设计与仿真。与传统电子设计相比,利用此软件进行设计将软件仿真与硬件设计互补,可降低成本、缩短开发时间、提高开发效率。     

Multisim7在《电子技术基础》教学中的应用

本文介绍了Multisim7作为一个优秀的电子设计自动化(EDA)软件,它有哪些功能特性,利用Multisim7进行电子线路仿真实验的基本方法,通过实例说明EDA技术在电子线路教学中的重要性。     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

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.     

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-