从两起液化气泄漏火灾谈销售市场消防安全现状

液化石油气作为一种清洁、方便能源在天然气逐渐进入城市家庭的今天仍然占据城乡接合部以及农村市场的绝大多数用户,农村地区随着经济生活条件的改善,逐渐淘汰了以"砍柴"、烧土灶的生火做饭方式,液化石油气成为了主要的能源,但由于液化气独特的性质,发生的越来越多的使用过程安全问题也充分暴露出城乡接合部以及农村液化石油气市场存在诸多的消防安全隐患。     

淮海经济区能源效率及节能潜力的时空分异

采用DEA模型,以地级市为研究单元,对2001~2010年淮海经济区能源效率及节能潜力的时空分异特征进行了分析,研究发现:1)该经济区能源综合效率处于中等偏上水平且呈现波动增长趋势;2)能源效率的区域差异呈现综合效率纯技术效率规模效率的特征,且均显示出先减后增的变化趋势;3)能源综合效率呈现由西北高而东南低的"单向倾斜型"格局演变为以济宁、泰安为中心向外围逐渐下降的"核心-边缘"型格局;纯技术效率高值区分布由以京沪沿线地区与鲁南经济带为骨架的"十"字型格局演变为以京沪沿线地区为主轴的"一"字型格局;规模效率由以鲁南为核心向外围逐渐降低的"核心-边缘"型格局演变为北部和东西两侧高、中部低的倒"U"型格局;4)节能潜力呈现以亳州、徐州、临沂3市为核心向外围逐渐降低的"核心-边缘"型空间格局;5)根据能源效率和节能潜力,将该经济区划分高效率高潜力型、高效率低潜力型、低效率高潜力型、低效率低潜力型4种地域类型.     

氢能源技术预测与燃料电池产业发展策略规划

近年由于能源短缺与全球暖化的问题,使得洁净能源的开发逐渐受到重视.针对氢能源科技的相关技术与燃料电池产业,运用专家访谈、专利计量学、成长曲线模型与策略分析等方法,进行技术预测与产业发展策略规划.研究结果显示,产氢技术与储氢技术尚未达到成熟阶段,需要更多的R&D资金以强化技术发展;同时,政府应采取适当的补助措施,以加速其技术发展进程;而燃料电池技术则以PEMFC技术发展最为迅速.     

浅谈路基路面施工中的精细化管理

该文以路基路面施工为研究对象,针对路基路面施工中精细化管理的相关问题进行阐述。文章首先对粗放型和精细化管理进行了比较,然后分析了在路基路面施工中推行精细化管理的可能性,最后详细分析了路基路面施工中精细化管理的具体措施和方法。该文旨在为路基路面施工实践提供一些指导,同时对于相关领域的其他研究也能起到一些借鉴和参考的作用。     

关于煤炭企业跨行转型的研究

针对煤炭资源的渐近枯竭和人口的逐年增加,现有的能源将逐渐不能满足企业发展的需要,而许多煤矿企业将因能源缺乏而失去动力,面临"矿竭企亡"的风险的问题,提出并介绍了煤炭企业跨行转型的思路、方法.     

广靖锡澄高速公路沥青混凝土路面上面层关键技术

针对高速公路沥青混凝土路面上面层的配合比设计和施工工艺控制等问题,探讨了保证面层施工质量的相关关键技术,以提高沥青混凝土路面的施工质量,从而提高经济效益。     

通村公路水泥混凝土路面的养护与管理

我国全面建设小康社会,大力进行新农村建设,"十一五"期间我省"村村通"工程建设突飞猛进.水泥混凝土路面具有就地取材的资源优势,通村公路水泥混凝土路面建设正在快速发展.由于水泥混凝土路面初期病害比较少,通村公路养护问题没有得到足够重视.文章指出通村公路水泥混凝土路面更要加强管理,并对常见病害提出养护措施,保障通村公路的畅通和延长其使用寿命,以提高通村公路的社会、经济效益.     

关于低等级公路水泥混凝土路面的病害及工艺探讨

水泥混凝土路面(cememt concrete pavement)是指以水泥混凝土为主要材料做面层的路面,简称"混凝土路面",亦称"刚性路面",俗称"白色路面"。水泥混凝土路面是一种刚度较大、扩散荷载应力能力强、稳定性好和使用寿命长的路面结构,并且养护费用较小,它的优点使它大面积的在低等级路面中广泛应用。但是由于农村公路建设资金有限,施工技术和施工条件都达不到理想标准,并且受道路纵坡度较大,弯道较多等多方面因素影响,农村公路在建成使用,雨水浸泡后,容易出现路面坑洼,面层磨损、塌陷等质量问题。下文中,具体就低等级公路混凝土路面的常见病害及质量控制措施进行探讨和论述。     

含脱空水泥混凝土路面交通荷载下的疲劳损伤机理

为获得含脱空水泥混凝土路面交通荷载下的疲劳损伤机理,开发了疲劳损伤本构关系的ABAQUS用户子程序UMAT,分析了全耦合方法下基准路面结构模型疲劳损伤场的分布与发展规律,并研究了交通荷载与面板弹性模量、面板厚度、脱空尺寸等路面结构参数对水泥混凝土路面结构裂纹形成疲劳寿命的影响.研究结果表明,随荷载作用次数的增加,路面结构的疲劳损伤不断增加,但其增幅逐渐减小,路面结构的荷载应力也逐渐减小.随着交通荷载的增加,路面结构的对数疲劳寿命呈线性减小趋势;随着面板厚度的增加,路面结构的对数疲劳寿命呈线性增加趋势;随着脱空尺寸的增加,路面结构的对数疲劳寿命呈幂函数曲线相关关系.     

基于水泥混凝土路面抗滑耐磨性能的研究

现有资料表明,水泥混凝土路面抗滑能力不足,随着使用年限的增加其抗滑性能下降很快,良好的抗滑能力能够增强汽车轮胎与路面的摩擦力,可以减少交通事故的发生.水泥混凝土路面细集料的耐磨性能够改善路面的长期抗滑能力,选用高耐磨性能的路面材料是改善水泥混凝土路面抗滑能力的重要措施,能够从本质上解决水泥混凝土路面抗滑能力快速降低的问题.通过水泥混凝土工作性对路面抗滑性能影响的研究,得出机制砂、天然砂和标准砂制作的水泥砂浆都会随水灰比的增大,其抗弯拉、抗压强度逐渐降低,流动度和磨损量逐渐变大;水泥砂浆磨损量随屈服应力的增加逐渐降低,耐磨性能逐渐增强,且屈服应力和磨损量之间具有较好的线性对应关系,相关系数都在0.89以上.     

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     

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     

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