回转器电路特性的分析

本文通过对一种回转器电路的特性进行计算分析,给出分析方法并讨论了回转器设计及应用中所关心的一些问题,如回转频率、稳定性、模拟电感及适用范围、灵敏度等。同样的方法也适用于其他的回转器电路分析,可供回转器的设计及应用时参考。     

应用零泛器计算偏置电路的参数

本文介绍了零泛器的端口特性关系,晶体管的零泛等效电路,给出了应用零泛器设计计算偏置电路参数的一种方法。     

模拟电感的等效电路模型及其应用初探

提出了一种模拟电感的等效电路模型,并给出了其在RL振荡电路和一阶电路中的应用。通过建立电路方程组求解回转器输入端的伏安关系,推导出了模拟电感的等效电路模型,及实现负电感和负电阻的条件,并在此基础上用模拟电感构建了RL低频正弦波振荡电路和RL一阶电路,提出了这类RL一阶电路的约束关系式。利用等效电路模型得到的振荡频率值和暂态电流响应,与计算机软件仿真结果基本相符,验证了等效电路模型的正确性,为模拟电感电路的工程速算提供了理论基础。     

晶体管的零器模型

给出了一种新的电路元件零器、零口器、非口器的概念，并用它们构造晶体管模型──零器模型．还论述了零器模型在晶体管电路的分析和设计中的应用．     

基于CCCⅡs接地回转器的系统综合法

根据节点导纳矩阵扩展法(括号符号法),系统综合基于二代电流控制传输器(CCCⅡ)的接地回转器,得到了两类接地回转器.A类回转器使用2个CCCⅡ,并有4种形式.B类回转器使用3个CCCⅡ,并有16种形式.所综合的电路容易被集成,通过调节的CCCⅡ偏置电流,电路的参数能电控调节.为了证实导出电路的可实现性,利用一个A类回转器构造了一个二阶带通滤波器,MULTISIM仿真结果与理论一致.     

(p q)端口回转器综合分段线性n端口电阻器

提出（ｐ＋ｑ）端口回转器综合分段线性ｎ端口（电流控制电压型ＣＣＶ和电压控制电流型ＶＣＣ）电阻器,用（ｐ＋ｑ）端口回转器综合分段线性ｎ端口电阻器比用（ｐ＋ｑ）端口变压器综合具有较大的优越性     

基于Simulink的忆阻器模型

为了使忆阻器具有与其他器件相结合的能力,本文在惠普实验室提出的忆阻器物理模型电路关系的基础上,在Simulink中用二种方法对忆阻器进行了双端口建模,方便准确的实现了对于忆阻器的仿真。与编写M文件、构建图形用户界面和搭建输入输出模型的建模方法相比,基于Simulink的双端口模型不仅能够方便准确的观察忆阻器的输入输出特性,而且具有更广阔的应用范围,对于忆阻器的研究有一定的指导作用。     

使用散射参数综合电流模式有源滤波器

讨论了用散射参数表达的串联阻抗Z和并联导纳Y的二端口特性 ,给出了它们的有源RC电路模型。作为应用实例 ,提出了一个用第二代电流传输器和RC元件组成的N阶电流型滤波器电路 ,不必改变电路参数 ,能同时实现高通和低通滤波功能。     

具有双输出的电流模式有源滤波器的设计

讨论了用散射参数表达的串联阻抗Z和并联导纳Y的二端口特性，给出了它们的有源RC电路模型。作为应用实例，提出了一个使用通用运算放大器和RC元件组成的Ⅳ阶电流型滤波器电路，不必改变电路参数，能同时实现高通和低通滤波功能。     

实现回转器的一种方法：负阻抗变换器的应用

本文从理论和实验上介绍如何利用负阻抗变器实现回转器，进而指出其应用。     

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     

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