基于二维非稳态导热模型的蓄热式加热炉炉长研究

实现了一个钢坯加热二维非稳态导热模型，并基于该模型对蓄热式加热炉的设计特别是有效炉长的确定进行了研究。计算结果与工程数据的对比表明，计算结果是准确可靠的。该模型及由此给出的蓄热式加热炉参考炉长，对蓄热式炉的设计，特别是对确定蓄热式炉的炉长具有指导作用。     

步进梁式加热炉钢温预报的数学模型

以机理分析与现场实验为基础,开发了一种步进梁式加热炉钢坯温度预报的动态数学模型,该模型具有结构简单,计算量小等优点,且仿真结果表明它能满足精度需要,能够实现对加热炉内钢坯温度分布的在线预报。     

加热炉射流传热模型的考核

研究了圆筒型加热炉辐射室的传热计算，辐射采用Ｍｏｎｔｅ Ｃａｒｌｏ法，对流采用射流模型，对比计算与实验结果基本符合，具有一定的实用价值。     

加热炉射流传热模型的考核

研究了圆筒型加热炉辐射室的传热计算，辐射采用ＭｏｎｔｅＣａｒｌｏ法，对流采用射流模型。对比计算与实验结果基本符合，具有一定的实用价值。     

500kW相变加热炉对比设计

相变加热炉在油气集输工程中得到了广泛的应用，在降低能耗方面发挥了重要的作用，目前使用的相变加热炉大体分为一体式及分体式，可以说两种结构型式的加热炉各有优缺点，当前还没有文献对满足同等热力要求的不同结构型式的加热炉进行比较设计，该文正是在这种背景下，针对某油田公司提供的加热炉技术要求，对能够满足该技术中热力要求的加热炉进行了两种结构型式的设计及计算，并比较了两种结构的优缺点，为此种规格型式的相变加热炉的结构设计及优化提供指导。     

加热炉热电偶的分布研究

本文主要讲述了加热炉内热电偶的位置的不同对一级控制和二级计算的影响。其中在二级加热炉内炉气、炉墙、板坯表面换热计算中采用了三温度点模型。     

加热炉过程模型的辨识

以四段式环形加热炉为例，系统地讨论了加热炉多变量随机过程模型的建立方法，包括过程变量的选取，数据采集实验的设计，多变量随机过程模型的辨识方法研究，最后给出了环形加热炉的过程模型辨识结果。     

基于热力学混合遗传算法的加热炉炉温优化研究

针对加热炉生产过程中钢坯入炉温度、规格尺寸、钢坯种类等生产工况经常会发生改变,导致基本遗传算法存在早熟等现象,提出一种基于热力学的混合遗传算法.基于钢坯加热过程的机理模型,建立了钢坯温度预报模型,依据加热炉工艺生产要求,建立了加热炉炉温优化模型.为了提高遗传算法的求解精度和计算效率,在遗传算法交叉算子设计过程中加入内能、熵和自由能的思想,改进了传统遗传算法;同时在经典的遗传算法基础上加入模拟退火算法构成了基于热力学的混合遗传算法,并用于求解加热炉炉温优化问题,克服了传统遗传算法的不足.实验结果表明,该方法能够有效地求解加热炉炉温优化问题,是可行的、有效的.     

中型轧钢厂连续加热炉各段供热优化研究

以唐钢中型厂轧钢加热炉为研究对象，从炉子结构、技术性能及传热、散热机理出发，以燃耗最小为优化目标，建立了机理与实验想结合的优化数学模型，该模型在计算机上进行了模拟计算，获得了在不同产量下的各段热负荷分配曲线，为加热炉数模优化控制提供了重要参考依据。     

蓄热式加热炉流场的数值模拟

利用大型软件CFX建立了蓄热式加热炉炉内速度场的数学模型．采用k-ε模型数值模拟炉内的湍流流动，分析喷口几何形状及尺寸，喷口的分布位置等对炉内的速度分布的影响．计算结果为，蓄热式加热炉炉内流场与传统加热炉迥然不同，流场分布有利于燃料和助燃空气的混合，符合高温低氧燃烧的的流场分布．另外，影响炉内速度场的因素有炉型结构、喷口几何形状与尺寸及喷口的分布位置等．     

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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