利用MINITAB软件对质量异议的分析

运用MINITAB软件对济钢中厚板厂2005年质量异议情况进行分析,可知Q345系列低合金钢是产生质量异议的主要产品,性能及厚度不合、短尺及凹坑是主要异议项目,加热及轧制制度不合理是产生质量异议的主要原因。为此在生产Q345系列低合金钢时,分别在加热、轧制及剪切工序采取了相应的改进措施,主要质量异议比去年同期降低55.6%。     

Design consideration of photocatalytic oxidation reactors using TiO2-coated foam nickels for degrading indoor gaseous formaldehyde

In the design process of the photocatalytic oxidation (PCO) reactor using TiO₂-coated foam nickels, the optimum of catalyst film thickness, light intensity and flow velocity were considered. A model was developed to study the effect of catalyst film thickness on photocatalytic degradation of formaldehyde by a TiO₂-coated foam nickel at continuous flow mode. In this model, external mass transfer and internal molecule diffusion-reaction were considered. A first-order kinetics equation was used to account for the photocatalytic reaction. Two exponential equations were employed to describe the distribution of light intensities in foam nickels and catalyst films, respectively. Validated with experimental data, the model can be used to predict the optimal thickness of catalyst films. A method for determining appropriate light intensities was proposed and discussed. The appropriate light intensity can be obtained by giving a margin, regarded as an excess coefficient, to the light intensity calculated based on the assumption of complete use of excited electron–hole pairs. The excess coefficient needs to be determined experimentally. In addition, the optimal flow velocity of PCO reactors could be consistent with the required one by changing the windward area of foam nickels. Based on the theoretical analyses, a novel PCO reactor containing 15 parallel-connected cells was designed. Each reaction cell was composed of an UV lamp and a TiO₂-coated tubular foam nickel. The performance of the reactor was tested by degrading gaseous formaldehyde at an indoor concentration level. The results showed that the reactor had low pressure loss and good degradation capability.     

Preparation of submicrometer-sized titania hollow spheres by templating sulfonated polystyrene latex particles

Submicrometer-sized titania hollow spheres with tunable shell thickness and smooth surfaces have been successfully synthesized by employing sulfonated polystyrene (PS) latex particles as a template in sol-gel method. The structure of the particles was characterized by scanning electron microscopy and transmission electron microscopy. The shell thickness was readily tuned by altering the concentration of titanium tetrabutoxide (TBOT) in ethanol solutions. The surface roughness as well as the shell thickness has the tendency to increase with the increase in the concentration of TBOT. The diameter of the hollow spheres was on the average of 20-26% smaller than the diameter of template PS latex particles. Some titania fragments were also observed for the sample with the highest TBOT concentration.     

主电机轴瓦异常情况分析解决办法

介绍南钢中板厂四辊轧机主电机轴瓦一种非典型故障现象，原因分析及解决办法，提出了对类似问题个人见解。     

羊二庄油田-断块明Ⅲ5层系开发效果分析

由于底水正韵律油藏的特殊性，在油藏开发后期，实施提高采收率的常规方法难以达到预期效果，油藏挖潜困难。在对羊二庄油田-断块Ⅲ5油藏地质特点分析的基础上。对开发历史上采用的各种治理手段，对断块油藏开发效果进行评价。并利用油藏数值模拟、精细油藏描述等技术，通过对油藏进行油水运移规律、底水油藏数值模拟等研究，得出油藏剩余油分布结论，进一步制定了符合油藏实际情况并在目前技术条件下可以实施的治理方法，目前已实施并取得成功。     

熔体吹气发泡法制备泡沫铝合金研究

泡沫金属是近年来发展起来的一种新型材料。文章采用熔体吹气发泡法制备出了孔径为5．0—8．3mm，壁厚为0．040—0．076mm，密度为0．19—0．40g／cm^3，孔隙率为85．2％—93．0％的Al—Si泡沫铝合金，并着重讨论了发泡温度、气体流量、SiC粉末体积百分含量对泡沫铝合金形成的孔径和壁厚的影响关系。     

（yxl）φ切压电石英谐振器振动模式分析

从压电方程，动力学方程入手，分析了（ｙｘｌ）φ切石英谐振器的厚度切变振动，利用自由边界条件及串联与并联谐振时的电学条件，求出了并联谐振频率和串联振频率，讨论了实测频率与频率公式存在一定偏差的原因。     

多层介质光学膜系的误差分析——膜层厚度变化的灵敏度因子

文中推导了对于给定膜系的特定膜层的厚度变化的灵敏度因子计算公式，并给出了用计算机对不同膜系的计算实例。分析了厚度灵敏度因子对膜系透射光谱的灵敏谱段、灵敏膜层等特性的影响规律，并由此给出了确定膜层厚度允差的方法。     

恢复地层剥蚀厚度方法综述

恢复地层剥蚀厚度是对盆地进行定量研究的重要基础工作。本文综述、评价了目前常用的恢复剥蚀厚度的方法,并对作者曾提出的天然气平衡浓度法作了进一步的阐述。     

铣槽专用夹具设计

从零件的几何形状 ,配合要求入手 ,设计零件铣槽的专用夹具