油烟道火灾的危险性及其预防对策

针对近些年餐饮业火灾频发的势头,就餐饮业火灾中最常见的油烟道火灾的特点、危险性及火灾多发原因进行了综述,总结出我国油烟道火灾事故危险性、火灾原因,目的在于最大限度地减少油烟道火灾,并提出其预防对策,为规范烟道设计、安装、洗等管理工作提供参考,同时也呼吁社会加快烟道规范化管理工作的法制进程.     

浅析排油烟管道火灾发生原因及预防措施

本文通过对油烟道火灾原因的分析,提出了预防油烟道火灾的技术,以及清洗、灭火、管理对策,对做好油烟管道的消防安全工作提出相应的解决方案。     

主变排油充氮消防装置

针对电力变压器着火现象，分析了其原因，并介绍了目前先进的灭火装置——变压器排油注氮防爆防火灭火系列装置。对该装置的防爆防火灭火基本原理以及特点进行阐述，并与其他消防装置比较；针对排油充氮消防装置运行中常见问题，提出了解决措施，并总结了日常维护和保养措施。     

井下移动式防火和灭火注胶系统

介绍了分析胶体防火和灭火材料的特点,论述了胶体防火和灭火系统的类型,分析了井下移动式胶体防火和灭火系统的构成,指出了井下局部自燃火灾灭火系统布置方式。     

档案库房的防火与灭火剂的选择

档案库房的防火,关键是要消除引发火灾的隐患,在我们头脑中筑起一道防火墙。我们必须采取适宜档案库房的消防装置。最适合档案库房防火灭火的当首推二氧化碳灭火剂了。     

浅谈防止电力电缆火灾的对策

通过对电力电缆火灾起因和危害的分析,提出了防止电力电缆火灾的三点对策。首先要防止电缆本身和外界因素引起电力电缆着火,其次要防止着火后蔓延扩大,第三要采取有效的灭火措施。     

怎样预防抽油烟机失火？

抽油烟机在一般情况下是不会着火的。但也不要忽视抽油烟机的安全。抽油烟机主要靠电机带动叶轮旋转将油烟排到烟道中。为了安全，应尽可能地将排烟管道直接通往室外。     

微米和纳米钛粉尘层着火蔓延特性研究

为了解微细钛粉的层火灾危险性,采用标准热板测试装置和自制的粉尘层火蔓延实验装置,研究了微米和纳米钛粉尘层最低着火温度和火蔓延速率变化规律,并验证了热爆炸理论模型和粉尘层火蔓延速率模型的适用性.结果表明:钛粉尘层最低着火温度随粒径减小而降低,33μm钛粉和60~80nm钛粉的粉尘层最小着火温度分别为>400℃和230℃,与Thomas模型计算结果基本吻合;钛粉的层火灾危险性受粒径影响较大,实验测得微米和纳米钛粉的粉尘层火蔓延速率分别为13.60和500.57mm/s,均大于理论模型计算结果.研究结果对微细钛粉的层火灾安全评价和工业防火防爆设计具有参考价值.     

超大型油罐火灾分区灭火方案及实验验证

现有超大型油罐密封圈初期火灾采用完全填充方式进行灭火,绝大部分泡沫覆盖了未燃烧区域,造成有效供给量不足.为提高灭火效率,节约泡沫用量,该文在不改变现有油罐结构和灭火系统基础上,提出了一种超大型油罐火灾分区灭火方案.为验证方案的有效性,设计搭建了环形油盘装置和小型外浮顶油盘实验装置,对泡沫流动性和分区灭火有效性进行实验研...     

厨房自动灭火闭气系统

为了克服现有的煤气灶台不具备自动探测和灭火功能等不足,本设计提供一种煤气灶台自动灭火装置,该装置通过烟雾传感器来检测空气中的可燃气体含量,并通过声光警报来提醒人们注意安全;同时,当发现有火灾发生时,该装置不仅可以及时切断煤气阀门,而且还可以喷射出灭火物质,进行灶台局部灭火。这样一来可以有效减少因为灶台煤气泄漏而引起火灾、爆炸等事故。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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