Cardiff 型旋风除尘器的反求

分析了Ｃａｒｄｉｆ型旋风除尘器的结构以及其结构对性能的影响。根据旋风除尘器的工作原理，按近年出现的旋风除尘器最优设计原则，设计了一种形状与Ｃａｒｄｉｆ型除尘器类似，但几何形状、尺寸又不尽相同的新型旋风除尘器。对该新型旋风除尘器的技术参数进行了理论预测和实验测试，模型实验结果表明：所设计的新型旋风除尘器模型技术性能优良，且与理论预测值接近，这说明，对Ｃａｒｄｉｆ型旋风除尘器的几何参数设计已取得了初步的了解。     

环缝气垫高效耐磨旋风除尘器的研究

为了经济、有效地提高旋风除尘器的耐磨性能和除尘效率，提出了在旋风除尘器内壁设置环缝套圈的增效防磨新方法，在理论上探讨了高速含尘气流对器壁的磨损机理和二次扬尘现象。在２ｔ燃煤锅炉上不同烟气流速下的对比实验表明，该新型旋风除尘器的除尘效率比普通旋风器提高５％，平均阻力系数比普通旋风除尘器降低１０％。     

环流式旋风除尘器分离效率数学模型的研究

研究者针对新型旋风除尘器的特点，推导出了计算环流式旋风除尘器内筒分级效率的数学模型，并与Ｌ－Ｌ横混模型相结合，把环流式旋风除尘器看作部分环流的两个常规旋风除尘器的串联，进行其分离效率的研究。理论计算与实验析比较表明，该数学模型基本反映了新型环流式旋风除尘器内粒子流动、粒子分布以及粒子分离的实际情况。     

连续螺旋旋风除尘器的结构特点分析

根据旋风除尘器内的流场及结构分析，设计出一种采用阿基米得螺旋线结构的连续螺旋旋风除尘器，对其结构特点进行了分析。该除尘器具有结构简单、体积小、低阻和高效的特性。     

连续螺旋旋风除尘器的测试分析

本文利用自行设计和制造的连续螺旋旋风除尘器，对水泥厂生产中的扬尘点进行了半工业性试验，并结合实际效果进行了分析。结果表明：该旋风除尘器具有低阻、高效的特性，压力损失：100～400Pa，收尘效率达90％以上，临界分离粒径小于3μm     

环流式旋风除尘器的性能

针对目前工业除尘器除尘效率低和经济上、技术上的一些难题,以电厂静电除尘除下来的粉煤灰和空气作为物系,测试了环流式旋风除尘器的分离效率和压降,并推导了环流式旋风除尘器分离效率的数学模型.实验结果表明,环流式旋风除尘器与B型高效旋风除尘器相比,具有压降低、分离效率高的优点.计算结果表明,分离效率模型的计算值与实验值基本吻合.工业应用表明,环流式旋风除尘器处理量大,操作稳定,放大效应小;工业环流式旋风除尘器与常规型旋风除尘器相比,除尘效率提高了15%,压降降低了40%左右.     

直锥形旋风除尘器的研究和应用

本文从理论上分析了用旋风除尘器清洗锅炉烟气时,锅炉烟尘对旋风除尘器在结构形式上的特殊要求,提出了直锥形(即XZZ型)旋风除尘器的设计方法,井通过了大量的实践验证,说明专门为锅炉烟气除尘而设计的XZZ型旋风除尘器内引起局部磨损的原因的理论分析也是正确的,从而解决了旋风除尘器在锥体部位的局部磨损问题,减少了能量浪费,提高了除尘效率,降低了气流阻力。此外,还介绍了该旋风除尘器在其它条件下的实际使用情况。     

原煤储备除尘器的设计改造

针时原煤储备除尘器存在的问题，综合多管旋风除尘器和CLS型水膜除尘器的结构、性能、特点，结合改造资金少而选煤工艺中又有一套完整的煤泥水闭路循环系统．同时为合理有效回收利用澡堂水，时除尘部分进行了设计改造，采用三级多管旋风水膜除尘器方案，达到了预期效果。     

多管旋风除尘器内气流分布的计算模型

通过对多管旋风除尘器内气流阻力平衡分析，探讨多管旋风除尘器中各旋风子单体的气流分配状况，建立了气流分布计算模型，结合算例进行了分析。     

旋风除尘器的分离效率

多年来,旋风除尘器就成为工业中主要除尘设备。特别是近年固体流态化技术在冶金、化学和石油工业中获得愈来愈广泛的应用,寻求旋风除尘器的高效率和经济性就引起技术工作者的普遍注意。本文系在研究旋风除尘器过程中综合各种观点和我们的意见,澄清了流行的不正确概念,并提供了若干设计的原则意见。     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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