无机膜分离除尘器自动控制系统设计

本文描述了新研制的无机膜除尘器的工作原理和控制要求,针对该除尘器的特点,为了克服以前采用接触器、继电器控制的缺点,采用可编程控制器重新设计了控制系统,经过实践证明,该系统克服了以前的控制系统的控制不准确,电磁阀误动作、易损坏流量计,控制工艺参数设定不方便等缺点,取得了较好的控制效果。     

气动式防盗盖铣字机的PLC控制系统设计

采用PLC设计了一种用于气动式全自动防盗盖铣字机的控制系统,介绍了该系统的自动循环工序、控制原理,给出了应用SFC图转换梯形图设计PLC控制程序的方法.该控制系统克服了传统的机械式铣字机加工效率低、结构复杂、维修困难等缺点.     

模糊PI在汽车用爪极发电机控制系统的应用研究

针对爪极发电机控制系统提出了一种模糊PI控制方法,该方法克服了简单模糊控制与传统PI控制的一些缺点,同时利用MATLAB软件中的模糊控制工具箱进行了系统的辅助设计与仿真实验,仿真结果表明,该仿真方法可是爪极发电机控制系统性能提高。     

单片机速度控制系统输出电压的隔离措施

介绍了以单片机系统为核心的机械速度控制系统中速度控制电压产生与隔离的一种新型电路结构．该电路克服了以往隔离电路结构复杂、调整麻烦、对器件要求高、造价较高的缺点．在工业现场中试验表明，其工作可靠、调整方便、适应性强，并具有足够的速度控制精度．     

永磁同步电机分数阶与滑模变结构复合控制研究

针对永磁同步电机矢量控制系统的速度环,通过引入分数阶微积分及滑模变结构控制理论,设计了一种分数阶与滑模变结构复合控制器.该复合控制器通过一个可变的加权因子α将分数阶PIλDμ与滑模变结构控制有效、协调地组合起来,从而达到了既克服滑模变结构在滑动平面原点附近产生高频颤动的缺点,又拓宽了相对于传统比例-积分-微分(PID)控制器的调节范围,使得永磁同步电机控制系统的鲁棒性、快速性、稳定性和抗干扰能力得以提高,对于采用多种复合交叉控制方法来改善电动机控制系统具有参考意义.     

一种基于核ridge回归的解耦控制系统

提出了一种新的基于核ridge回归的解耦方法。该方法具有传统径向基(RBF)神经网络解耦方法对被控对象数学模型依赖性小的特点，同时又能有效地克服RBF神经网络解耦方法对训练样本要求高、噪声敏感和解耦速度慢的缺点，经核ridge解耦器补偿后的控制系统具有被调节量和调节量之间耦合作用小、动态特性好、稳定性强的优点。补偿后的控制系统具有很强的校正能力，对外界各种干扰也有较强的解耦效果和控制质量。仿真试验表明，采用核ridge解耦器的多变量控制系统能够有效地解除系统各变量之间的耦合作用，且结构简单、易于实现，大大增强了解耦控制系统的实用性能。     

基于MCGS的冷库集散控制系统的研究与设计

针对冷库控制参数多、管理复杂,目前我国绝大多数冷库还处在采用传统模拟控制器分散控制和人工管理的落后状态的情况,研究和设计了基于MCGS工控组态软件和RS-485总线网络的冷库集散控制系统.该系统克服了冷库采用传统分散控制方式操作管理不方便,控制性能、质量差,能耗大,效率低的缺点,不但能有效地提高冷库的控制性能质量和安全性、可靠性,而且还能节能降耗、提高冷库运行的经济效益.     

电袋复合除尘器脉冲清灰控制技术

脉冲清灰控制技术被广泛应用于袋式除尘器和电袋复合除尘器,通过对以往经验的总结,并结合电袋复合除尘器的特点开发出一套以PLC为控制核心,配套上位机监控系统的脉冲清灰控制系统。经实践证明该系统稳定可靠,自动化程度高,清灰效果显著。该文对电袋复合除尘器的脉冲清灰控制技术的控制原理、主要功能和软硬件设计进行了介绍。     

可编程序控制器在等离子喷焊机上的应用

等离子喷焊工艺程序复杂，要控制的开关量较多．现有设备多采用继电器及二极管矩阵系统进行程序控制，其结构复杂、易出故障、维修及修改程序均不便．本论文介绍了一种采用Ｃ６０Ｐ型可编程序控制器进行等离子喷焊工艺程序控制及检测电路、保护电路控制的控制系统．文章还介绍了等离子喷焊工艺流程逻辑图设计、硬件抗高频干扰系统与接口分配系统设计以及软件编程等．实践证明，改进后的设备较好地克服了原设备的缺点     

基于ATmega16的抽气式转杯纺纱机控制系统改造

抽气式转杯纺纱机是自排风式转杯纺纱机的更新换代产品。抽气式转杯纺纱机由可编程控制器（PLC）和变频器实现其电气控制，这种控制方式的缺点是需要扩展众多的各类PLC模块，PLC连线较多且复杂，成本高。基于ATmega16单片机的控制系统改造，利用PLC采集整车传感器信号，采用单片机实现单锭状态控制，克服了仅由各类PLC控制时出现的弊端，并且降低了控制成本。在F1605型抽气式转杯纺纱机中，应用ATmega16单片机实现的控制系统改造能够满足纺纱加工工艺的要求。     

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.     

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.     

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-     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of