A simple plume model induced by stack effect in a vertical shaft

After comparing the mechanism of tilted plume under stack effect with that of spill plume,the tilted plume model induced by stack effect in a vertical shaft is developed simply based on the theoretical results and a series of full-scale tests. It is shown that the two sides of plume are symmetrical and have an accordant regulation that the plume radius has a linear relation to the height z. The profile of fire plume under stack effect is similar to the windblown flame in wind tunnel,and the range of flame deflection angle is about from 50 to 60 degree.     

室内甲醛污染与儿童哮喘关系的研究

目的：探讨室内甲醛污染与儿童哮喘之间的关系，为进一步深入研究提供科学的理论依据，同时也为儿童哮喘的防治提供相关的建议与措施。方法：采用病例一对照流行病学研究设计．通过问卷调查儿童哮喘患者病例共50例．同时收集50例对照相关信息并测定100户研究对象室内空气中甲醛的浓度。结果：病例组室内甲醛浓度的分布在总体上高于对照组，且具有显著性差异（P〈0．05）；将室内甲醛浓度从低到高分为4个等级，4个等级的室内甲醛浓度均未超过国家规定的标准（0．10mg／m^3）；总趋势0R值表明在调整混杂因素前后，室内甲醛浓度平均升高一个等级儿童患哮喘的危险性分别为2．17倍和1．96倍。结论：室内甲醛浓度的升高可以使儿童哮喘发作的危险性增加．并存在剂量一反应关系。     

机房精密空调系统的设计与施工工艺

详细阐述机房精密空调系统的设计方法,以及精密空调室内机与室外机的施工工艺。     

火电厂烟气湿法脱硫吸收塔氧化空气管断裂原因分析及对策

本文针对华润电力（菏泽）电厂烟气湿法脱硫吸收塔氧化空气管屡次断裂的现象，通过现场分析，指出氧化空气管开孔较少，末端封闭的管网式设计安装不匹配，以及颤动较大是氧化空气管损坏的主要原因，并且提出了防范和解决措施，同时也提出了管网式氧化空气管，如何适应机组长周期运行和提高设备可靠性的方案，供大家探讨研究。     

铬鞣废液直接循环利用技术的研究与应用

采用淀粉改性水处理剂,并借助气浮法能有效除去铬鞣废液中可溶性油脂、蛋白质及其他杂质,从而消除了铬鞣废液直接循环利用中杂质累计对皮革质量的影响.研究表明,处理后的铬鞣废液利用率可达到90%,且循环利用多次,成品革的性能稳定,从而可实现铬鞣废液的清洁化生产.     

Effects of Excess Air Coefficients on Combustion Characteristics of N-butanol by a Constant Volume Combustion Bomb

The effects of excess air coefficients on the combustion characteristics have been experimentally investigated by means of a constant volume combustion bomb.N-butanol was tested as the research fuel at different air-fuel equivalence ratios.Through the discussion of the combustion pressure,the combustion temperature,accumulated heat release,ignition delay and combustion duration,the effects of the excess air coefficient on combustion characteristics is clarified.Experimental results show that near the theoretical air-fuel ratio,the combustion rate is the fastest accompanying with shorter combustion duration while the combustion pressure and temperature reach the maximum.With increase or decrease of the excess air coefficient the combustion pressure,the temperature and the heat release reduce.Simultaneously,the combustion timing is deferred and the combustion duration becomes longer.     

Research on Properties of Woven Fabrics Treated by High Pressure Water Jet

The paper introduces a new technique for the treatment of the woven fabrics. Sprayed by high pressure water jet, the appearance, handle and stiffness of the fabric are improved. Other properties of the high pressure water treated fabrics like drape coefficient, air permeability, tenacity are also presented.     

大型地下洞室群通风空调系统设计

文章概述了大亚湾反应堆中微子实验站工程地下实验厅的通风空调系统在大体积洞室群，长距离通风及温湿度要求高等复杂条件下的设计思路和方法。     

V型太阳能空气集热器热过程的数值模拟

从太阳能空气集热器传热特征及热平衡分析出发，建立了适合于V型、平板型、单流道、双流道、带与不带肋片的空气集热器的通用数学模型，并根据工程实际对模型作了合理的简化。采用有限差分法对微分方程离散化后，可方便地求得空气集热器的瞬时效率。     

数字气缸的行程设计

研究了数字气相缸的行程设计方法，建立了活塞分行程和输出行程系列值的计算方程，编制了相应的计算框图，可为数字气缸的行程设计提供一种有效的方法和理论依据。