过磷酸钙折流混合器的改进

由于绿原化工有限公司过磷酸钙装置生产能力由 6 70 t/ d(实物量 )提高到 84 0 t/ d,折流混合器负荷增大 ,出现折流环磨损加快等问题。采用若干技改措施 :扩大折流环内径、改变折流混合器喷射方向、采用新材料制作折流环 ,使折流混合器能满足 84 0 t/ d过磷酸钙生产的需要     

过磷酸钙含氟尾气处理的新方法

对动态泡沫床处理过磷酸钙含氟尾气的有关技术及费用作了说明 ,指出该方法费用高 ;提出一种新方法 ,该方法不加任何化学助剂 ,采用水作吸收剂 ,只需改变动态泡沫床一些设计参数和选用一种特殊的喷头 (喷头周围设计 1个圆锥形死角区 ,使含氟气体不可能进入该区 )避免了硅胶堵塞。该方法已在湖南浦市化工总厂运行 1年多未发现堵塞 ,同时该法投资少、能耗低、排放尾气达标     

单束纤维增强树脂基复合材料的热水老化性能研究

在96℃水中,对开芙拉29(Kevlar29),开芙拉49(Kevlar49)和聚苯撑苯并唑(PBO)纤维束增强的环氧树脂和双马树脂基复合材料进行老化实验后,再在60℃下进行干燥脱水处理。实验测定了吸水和脱水阶段的含水率及热水老化试样和干燥试样的弯曲性能。结果表明:在热水作用下,复合材料的弯曲强度和模量随热水老化时间的延长呈下降趋势,纤维与树脂基体间的界面发生破坏;再干燥脱水后,材料的弯曲强度和模量恢复,但仍低于未老化试样的性能,纤维与树脂基体间的界面破坏情况也类似。     

Variation in relative quantities of airborne sex pheromone components from individual femaleEphestia cautella (Lepidoptera: Pyralidae)

The airborne sex pheromone components (Z,E)-9,12-tetradeca-dien-1-yl acetate and (Z)-9-tetradecen-1-y1 acetate from single calling females ofEphestia cautella (Walker) were trapped within glass capillary tubes and were measured by gas chromatography-mass spectrometry. Broad and similar distributions of relative quantities were found for a laboratory strain and three Australian field strains, and means differed strongly from those reported previously for this species. The overall mean proportion of the two components found for Australian females was 8812. The composition in individuals ranged from 6327 to 973. The proportions for individuals appeared to vary slightly in a random fashion from day to day, and proportions for first-generation progeny were influenced by the maternal blend.Author order in this paper is alphabetical     

Effects of apitong (Dipterocarpus spp.) extractives on bond strength development and curing rate of adhesives

Emulsion polymer isocyanate ( ), polyvinyl acetate ( ) and resorcinol-formaldehyde ( ) adhesives were used to produce single lap shear specimens using resinous and non-resinous apitong (Dipterocarpus spp.) timbers. Tests showed that joints made with highly resinous apitong were about 40% weaker than similar joints made with non-resinous apitong. The resinous apitong was treated with different solvents to yield five different extractives which were characterized by infra-red analysis. Apitong extractives were then added to and adhesives and joints made with buna (Fagus crenata), a timber known to be low in extractives and easy to bond. Joints prepared using extractive-containing adhesives were generally weaker than those made with the unmodified adhesives. RF adhesives containing extractives cured more slowly than unmodified . It is thought that the acidic nature of the extractives changes the pH of the system sufficiently to affect the curing mechanism     

Effective prediction of DEA model by neural network

In this paper,a fast neural network model for the forecasting of effective points by DEA model is proposed,which is based on the SPDS training algorithm.The SPDS training algorithm overcomes the drawbacks of slow convergent speed and partially minimum result for BP algorithm.Its training speed is much faster and its forecasting precision is much better than those of BP algorithm.By numeric examples,it is showed that adopting the neural network model in the forecasting of effective points by DEA model is valid.     

高压旋喷桩复合地基承载特性的有限元分析

结合工程实际,运用大型有限元分析软件ANSYS分析了不同桩长、不同桩土模量比和不同桩间距情况下高压旋喷桩复合地基的承载特性.结果表明,该地基存在有效桩长,当桩土模量较合适时,该地基能够发挥最大作用;同时运用ANSYS优化功能,得出了最优桩长、最优桩体弹性模量和最优桩间距,为实际工程提供一些参考.     

螺纹桩在软弱地层中的应用

分析了螺纹桩的受力机理,探讨了螺纹桩单桩承载力的确定方法,指出螺纹桩单桩承载力高、节约材料显著、能充分利用地基土的特性,在软弱地层中的应用优势显著,并通过实际工程实例给予具体说明.     

静压挤密桩在湿险性黄土地基处理中的应用

为了解决水泥土挤密桩施工过程中噪音过大的问题,提出了地基处理的静压挤密桩施工法,并结合工程实际测试了静压挤密桩在湿险性黄土地基处理中应用的效果.测试结果表明,该方法在施工时噪音较小,施工速度高,满足设计要求,此为该地基处理方法的应用和推广提供了依据.     

筏板基础在自贡地区高层建筑设计中的应用研究

文章结合工程设计经验对自贡地区的高层建筑在选用天然筏板基础的设计过程中,对高层建筑基础设计中涉及到的重要的地基沉降计算、结构设计和地下水等有关问题的处理进行了具体分析,对在一般高层建筑中采用天然筏板基础的实用性和可行性从设计和施工两个方面进行了相关的工程探讨。