失重条件下含沙铝热剂的燃烧特性

研究了含沙铝热剂燃烧特性,结果表明:在失重状态下,含沙铝热剂的燃烧为扩散反应模式,随着含沙率的提高,燃烧温度和燃烧速率均呈下降趋势,且反应的难度增加,反应激活能由98.76 kJ/mol上升至301.63 kJ/mol.     

利用焦化工艺处理废塑料技术--添加剂OA的作用

利用热天平与200kg试验焦炉,研究添加剂(OA)、废塑料(WP)与首炼焦配煤(Coal)的热失重行为以及共焦化的成焦性能·结果表明废塑料、炼焦配煤与添加剂在相互重叠的热解失重温度区间内三者裂解生成的自由基相互作用(即协同效应),影响焦炭质量;添加剂OA、废塑料WP与炼焦配煤按比例1∶2∶97混合共焦化时,添加剂(OA)能够消除添加1%废塑料对焦炭质量产生的负面影响,使焦炭M40增加,M10降低,CSR升高,而CRI降低,具有显著的工业应用前景·     

火灾中燃料失重速率与烟气向远距离处迁移关系的实验研究

通过不同燃料在模拟房间—走廊结构实验装置中的燃烧实验，较系统地揭示了不同材料燃烧时失重速率变化与远距离处烟气迁移速度和CO浓度的关系。实验得到了不同燃料燃烧时的失重速率曲线。研究发现，多数燃料的烟气传播速度与失重速率呈线性变化的关系，油料和布料的烟气传播速度对质量失重速率的变化非常敏感；某些燃料燃烧产生有毒成分的峰值迁移到远距离处需要较长的时间。     

立窑内黑生料球的燃烧与反应特性研究

本文通过对黑生料球在不同煅烧温度下的残余碳、失重率及游离氧化钙等的测定,对立窑黑生料球的燃烧与反应特性进行了研究。认为黑生料球的燃烧大致可分为三个阶段。根据实验中游离钙的变化规律,并结合有关煅烧理论,肯定了黑生料煅烧的优越性。而实验中机械不完全燃烧现象,说明了“高灰分”对料球燃烧反应的影响,为实际生产控制提供了依据。     

废塑料油在船用柴油机上燃烧特性及适用性

通过一系列实验对废料油在船用柴油机上的燃烧特性及适用性作了研究，并着重探讨了废塑料油对排气产物的影响。试验表明，通过加入水及控制着火延时能有效地控制NOx及固体颗粒的生成量，且有效地改善燃烧性能。     

用TG-DTG-DSC研究生物质的燃烧特性

利用TG-DTG-DSC(热重-微分热重-差示扫描量热法)热分析联用技术,对生物质稻杆(DG)、麦杆(MG)和油菜杆(YCG)分别在10℃/min,20℃/min和40℃/min升温速率条件下的燃烧动力学特性进行了研究.考察了其着火温度、最大失重速率和燃尽温度等燃烧特征参数,计算了综合燃烧特性指数和燃烧动力学参数.结果表明:随着升温速率由10℃/min增加到40℃/min,其最大失重速率和最大失热量分别增加了3倍和1.5倍左右,综合燃烧特性指数增加了13～16倍,活化能在其不同燃烧区段相差5～30kJ/mol.     

城市污泥热解特性及燃烧特性实验分析

利用热重分析方法对污泥进行了热解特性实验,分析了污泥在不同升温过程中的基本失重规律。此外,热重曲线还说明污泥的燃烧方式与煤的燃烧方式不完全一样,污泥燃烧过程比较复杂,主要原因是挥发分析出阶段分为易挥发分析出和难挥发分析出两个阶段。实验表明,污泥可在较低温度下着火,并有着良好的燃烧特性,挥发分析出燃烧非常迅速,同时有一部分物质极难分解。煤的燃烧过程与污泥的燃烧过程存在明显的差异。     

不同气氛下柴油机排气微粒的燃烧特性实验研究

柴油机排气微粒捕集器的关键技术之一就是捕集器的再生.应用热重/差热同步分析仪,在空气、氧气两种气氛下对柴油机排气微粒进行燃烧特性实验,并就微粒的失重曲线和燃烧特性曲线、燃烧特征参数以及燃烧反应动力学等方面进行了分析.结果可以为柴油机排气微粒捕集器再生技术的实施提供指导和依据.     

白竹与烟煤共炭化产物燃烧特性与动力学研究

文章以白竹和烟煤为原料，在不同共炭化温度、不同掺混比条件下制备共炭化产物，采用热重分析法研究产物在不同升温速率条件下的燃烧特性，并采用Kissinger-Akahira-Sunose(KAS)法和Flynn-Wall-Ozawa(FWO)法计算动力学。结果表明，共炭化产物在燃烧过程中只出现1个峰，与煤单独燃烧基本一致，但综合燃烧特性优于煤；随着共炭化温度升高(350～550℃),灰分增多，燃烧效果下降；随着升温速率提高，样品微商热重(derivative thermogravimetric, DTG)曲线向高温段偏移，但样品的失重量不变；随着白竹掺混比增加，共炭化产物燃烧的失重量随之减少，着火、燃烧性能逐渐提升；白竹与煤共炭化产物燃烧时会出现协同效应；采用FWO法、KAS法活化能结果相近，FWO法模型较优，其线性相关系数高于0.95;白竹与烟煤按质量比7∶3掺混，在350℃条件下共炭化，升温速率为20℃/min时共炭化产物综合燃烧特性指数最好(3.98×10^-7 min^-2·℃^-3),最小着火能量最低(85.85 kJ/...     

生物质热解特性的热重分析

用热重分析法对木屑（柳桉，水彬）和造纸厂污泥的热解行为及其动力学规律进行了研究。分析了3种样品在不同升温速率（10－30℃/min)和不同粒径（0.09-0.25mm)下的实验结果，发现样样品的非等温失重过程由脱水，保持，剧烈失重和缓慢失重4个阶段组成。当粒径小于0.25mm时，对热解过程影响不大。在实验的基础上，提出用来表征热解难易程度的热解特性指数P。用改进的Freeman-Carroll方法计算出样品的热解动力学参数，并根据实验结果和动力学（参数）补偿效应，建立起柳桉和水杉在不同升温速率下的动力学参数的预防方程。     

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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