燃煤锅炉PM微尺度流体力学研究模型初探

构建了燃煤锅炉及烟道内可吸入颗粒物的流动模型的框架，模型包含颗粒碰撞、凝并、冷凝、成核、破碎、化学反应等物理化学过程．提出了该模型的研究思路和研究方法，列出了研究的重点和关键问题，给出了颗粒数密度变化函数，为研究可吸入颗粒物的流动模型奠定了基础．     

环境大气可吸入颗粒物的矿物学研究

首先介绍了可吸入颗粒物中矿物颗粒的研究意义，随后对国内外矿物颗粒的研究现状和研究方向进行了详细论述；使用X射线衍射(XRD)和带能谱的扫描电镜(SEM/EDX)对北京春季可吸入颗粒物中矿物组分进行了初步研究，结果表明，北京春季可吸入颗粒物中的矿物有石英、粘土矿物、硅铝酸盐矿物、硫酸盐矿物等，以硅铝酸盐矿物为主，同时存在新生的矿物颗粒，新生矿物的存在表明有活跃的大气化学反应发生；在研究的基础上，对今后开展矿物颗粒的研究提出了建议。     

信阳市冬季大气可吸入颗粒物中化学元素组成特征及来源解析

为了解信阳市大气可吸入颗粒物可能的来源,采样并分析信阳市大气可吸入颗粒物中化学元素组成,得到了可吸入颗粒物中14种化学元素的质量浓度.研究表明:信阳市可吸入颗粒物中主要化学元素为Al、Si、K、Ca、P、Fe、S,其中由燃煤引起的S元素质量浓度最高,为8.2 μg·m-3.因子分析结果表明:燃煤源、土壤源、建筑施工源与垃圾焚烧源是可吸入颗粒物的主要来源.     

北京冬季室内空气中TSP，PM10，PM2．5和PM1污染研究

人们每天2／3以上的时间在室内度过，室内空气中可吸入颗粒物对人体健康的影响越来越受到国内外研究人员的广泛关注，在我国，虽然人们对大气中细粒子的研究比较系统、深入，然而对室内环境中可吸入颗粒物的研究、报道却很少，作在北京市的海淀区、朝阳区、丰台区和昌平区选择了19个家庭，分别对其厨房、客厅和卧室的室内空气中TSP，PM10，PM2.5和PM1的浓度进行了测定，并且对室内空气中粉尘含量的影响因素进行了分析和探讨。     

泰安市城区环境空气可吸入颗粒物源解析研究

本研究主要建立了泰安市可吸入颗粒物(PM10)的源与受体成分谱数据库，通过化学质量平衡(CMB)受体模型进行解析，得出了采暖期和非采暖期各颗粒物污染源对空气可吸入颗粒物污染物的贡献值和分担率，为有针对性的尘污染防治提供科学依据．     

燃煤可吸入颗粒物及重金属汞控制技术研究进展

对燃煤电站锅炉可吸入颗粒物及重金属汞控制技术的国内外研究现状进行了总结,阐述了其基本原理和技术特点,并详细介绍了可吸入颗粒物及重金属汞脱除技术在世界上的最新研究成果,分析了其目前存在的问题和不足,提出了进一步的研究方向及联合脱除可吸入颗粒物及重金属汞的集成控制技术.     

江西省环境空气污染现状及其防治对策

以2013年江西省环境空气二氧化硫、二氧化氮和可吸入颗粒物监测数据为依据,分析了江西省环境空气污染现状,并提出了相应的治理建议对策。2013年全省二氧化硫、二氧化氮浓度年均值总体较好,而可吸入颗粒物为超二级标准。燃煤和机动车尾气是江西省环境空气中二氧化氮的主要来源;建筑扬尘和机动车尾气是导致城市环境空气可吸入颗粒物浓度偏高的主要原因。研究结果可以为江西省治理空气污染提供理论和技术支持。     

临沂市环境空气可吸入颗粒物源解析研究及污染防治对策

利用二重源解析技术分析了临沂市非采暖季节各颗粒物污染源对环境空气可吸入颗粒物的贡献，并据研究结论提出了防治扬尘污染的对策。     

商业街区可吸入颗粒物空间分布及其气象要素的相关性

目的研究沈阳市太原街商业街区可吸入颗粒物与湿度、风速等主要气象要素的相关性及其在不同水平截面和垂直断面处的分布规律.方法以太原街多时相监测数据为基础,采用SPSS Statistics分析了街区可吸入颗粒物平均质量浓度与湿度、风速等气象要素的相关性,采用Fluent软件,模拟街区内不同水平截面与不同街道断面的流场与颗粒物浓度场.结果商业街区可吸入颗粒物质量浓度变化在一定阈值范围内与湿度正相关与风速负相关.街道两侧建筑由于高度、形态与密度差异,形成了不同特性的街谷局部流场,对可吸入颗粒物扩散效果具有较大影响.结论在建筑容积率一定的情况下,通过调整裙房的屋顶形态及其与高层建筑的组合关系,能够改善可吸入颗粒物的扩散效果.     

模拟大气污染暴露对小鼠多组织急性损伤及肺组织的氧化应激效应

采用自主研发的气动雾化法装置,模拟自主呼吸条件下暴露于污染大气环境的真实状况,探讨大气可吸入颗粒物(空气动力学直径≤10μm)不同暴露时间对小鼠肺、脑、心、肝、肾、睾丸等靶器官组织损伤程度及可吸入颗粒物暴露导致小鼠的氧化应激效应.结果显示,可吸入颗粒物经气动雾化法暴露后导致小鼠肺、肾、肝、心等多组织发生病理性损伤,诱导肺组织发生明显的氧化应激,肺组织可作为可吸入颗粒物毒性机制研究的靶标组织.     

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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