颜料色浆的选择对外墙涂料耐候性的影响

探讨色浆的选择对外墙涂料色漆耐候性的影响因素。重点讨论色浆类型的选择对性能的影响,同一种颜色用不同的复合色浆对耐候性的影响,色浆与调色基础漆配方设计对耐候性的影响以及墙面基材对保色性的影响。     

影响商用车车身面漆涂层质量的部分因素

研究了影响车身面漆涂层质量的因素，即电泳底漆的粗糙度Ra对面漆涂层的光泽、鲜映性、橘皮、附着力、耐冲击性等性能的影响；是否喷涂中涂对面漆涂层的光泽、鲜映性、橘皮、紫外老化等性能的影响；抛光对面漆涂层外观质量的影响。     

Determination of the effect of pressure on viscosity of an isotactic polypropylene

Despite the importance of the effect of pressure on the flow properties of a polymeric material, it is often overlooked also because of the difficulties involved in the experimental measurements. In this study, the effect of pressure on viscosity for an isotactic polypropylene was characterized in both a direct and an indirect method. In particular, a homemade device was adopted to obtain data of viscosity under high pressure and high shear rates. In addition, an indirect method based on the Simha–Somcynsky equation of state was adopted to obtain the dependence of free volume on temperature and pressure on the basis of experimental specific volume measurements; the Doolittle equation was then applied to verify the dependence of viscosity on free volume. The two methods provided similar results, confirming that, at least for polypropylene, the indirect method based on specific volume measurements can be used instead of the more complex direct measurement of the viscosity under pressure.     

预分解窑生产中碱对熟料质量的影响

报告了国内某大型现代干法水泥厂预分解窑生产中碱对熟料质量的影响,这种影响导致熟料安定性不良,后期强度降低,对高碱熟料的岩相分析发现,碱对熟料矿物,特别是阿利特开貌具有明显影响,从保证熟料质量的角度提出了熟料中碱的限量标准。     

Morphological examination of the effect of antimony on the electrochemistry of lead

An SEM study of the oxidation of PbSO₄ on Pb and Pb-Sb alloys is presented. The formation of a duplex layer of PbO₂ on the antimonial alloy is established and the primary layer of PbO₂ on Pb-Sb is shown to be analogous to the single layer on pure lead.     

添加剂对污泥焚烧过程中重金属迁移特性的影响

利用管式炉研究了Cl、S、P对重金属迁移特性的影响,研究结果表明：C促进了重金属Cd、Pb、Zn、Cu的挥发,而对重金属Ni、Cr的挥发特性影响不大;S对重金属的挥发特性影响不大,在一定程度上抑制霞金属Zn、Cd、Ni的挥发,而对重金属Pb则促进其挥发;P对不同重金属的挥发特性影响不同,随着P含量的增加,重金属Cr和Ni的挥发的挥发率逐渐增大,而重金属Cd、Pb和Zn的挥发率逐渐降低。     

折流杆冷凝器壳侧冷凝压降的计算

<正>折流杆冷凝器的突出优点是流动阻力小,因而受到越来越多的重视.思勤等论述了折流杆冷凝器的结构特点及冷凝传热的计算方法,本文进一步探讨冷凝压降的计算.     

研磨设备的研磨效率与不同研磨方式对涂膜性能的影响

讨论了影响和提高研磨效率的因素，主要探讨了砂磨机和球磨机的研磨效率和不同研磨方式对涂膜性能的影响；着重研究了篮式砂磨机和球磨机这两种研磨方式在涂料耐磨性方面的差别，以及篮式砂磨机砂子填充量对研磨效率的影响。     

Possibility of the formation of diamonds as a result of the detonation of picric acid

The dependences of the detonation velocity and electrical resistance on the initial density of picric acid were determined for developing the conclusions made earlier for TNT- and RDX-based comjpositions concerning the effect of diamond formation on the detonation velocity and resistance of detonation products. A discontinuity of the dependence of the detonation velocity on the initial density and an increase of the resistance of the detonation products in the region of this discontinuity, which are related to diamond formation in the detonation wave, were found. The relative position of the dependences of resistance on density and of the discontinuities of the dependences of the detonation velocity on the density for various explosives is discussed.Chernogolovka. Translated from Fizika Goreniya i Vzryva, Vol. 27, No. 4, pp. 117–121, July–August, 1991.     

Estimating the degree of perfection of the crystalline structure of kaolin

Atechnique of estimating the structural instability of substances is developed on the basis of studies on hydrothermal modification of clay ores. It is suggested that estimation of the degree of perfection of the crystalline structure of mono- and poly-mineral clays be performed on the basis of a determination of the strength of individual junctions in suspensions.     

Application of fractal theory for characterisation of crystalline deposits

The objective of this investigation was to study the mechanisms of mixed salt crystallisation fouling on heat transfer surfaces and to characterise the structure of the deposits formed on the heat transfer surfaces. The effects of various operating parameters such as solution composition and hydrodynamics of the system on crystallisation fouling of mixtures of calcium sulphate and calcium carbonate, which are the most common constituents of scales formed on heat transfer surfaces, were studied experimentally. After clarification of the effects of operating parameters on the deposition process, deposits on the heat transfer surfaces were collected for analysis. The crystalline samples were analysed using Scanning Electron Microscopy, X-Ray Diffraction and Ion Chromatography techniques. It was found that crystallisation fouling on heat transfer surfaces exhibits fractal geometry. Therefore, the concept of fractal theory was used to quantify the structure of the deposits by introducing a new quantity called the fractal dimension.     

渣油胶体稳定性研究进展

由于环境、物质变化常破坏渣油原有的稳定状态,在不同阶段对渣油的高效加工利用带来不利影响。本文综述了近年来渣油稳定性现有研究进展,介绍了国内外学者对渣油胶体理论和胶体模型的认识。简述了结合渣油胶体稳定性理论而提出的CI、CⅡ、S、NCSI等稳定性预测参数,并对稳定性分析方法进行了归纳和总结,包括直接观察法、基于溶剂滴定的参数法、指数评价方法等,做了详细的阐述和说明,并就各个方法的优缺点进行了讨论。就渣油胶体体系稳定性研究来说,经典的四组分理论模型和基于溶剂效应来表征稳定性的分析方法在今后一段时间将会一直是研究重点,然而展望渣油稳定性研究,基于分子水平理论研究以及更便捷准确快速的稳定性分析方法会是今后研究的重点。     

玻璃弯曲强度的裂纹影响

玻璃弯曲强度的裂纹影响宋显辉，潘素瑛（武汉工业大学４３００７０）ＴｈｅＥｆｆｅｃｔｏｆＣｒａｃｋｓｏｎＢｅｎｄｉｎｇＳｔｒｅｎｇｔｈｏｆＧｌａｓｓ￥ＳｏｎｇＸｉａｎｈｕｉ；ＰａｎＳｕｙｉｎｇ（ＣｅｎｔｒｅｆｏｒＭａｔｅｒｉａｌｓＲｅｓｅａｒｃｈ＆Ａｎ...     

高速公路钢纤维混凝土的性能研究

结合高速公路的实际需要,研究了钢纤维掺量对混凝土性能的影响.在此基础上,研究了粉煤灰掺量对混凝土性能的影响.研究结果表明:钢纤维对于混凝土抗压强度、抗拉强度、抗折强度、磨损量存在一个最佳掺量,其最佳掺量分别是1.5％、2.0％、2.0％、2.5％.当钢纤维掺量为2.0％时,粉煤灰对于混凝土抗拉强度、抗折强度、磨损量存在一个最佳掺量,其最佳掺量分别是15％、10％、15％,但粉煤灰掺量对混凝土抗压强度影响不大.     

换能器结构参数对聚合物超声塑化黏弹生热的影响

为研究超声换能器结构参数对聚合物超声塑化过程黏弹性生热的影响,首先确定超声黏弹性生热系统的组成,进行纵振超声换能器结构设计;然后分析超声黏弹性生热过程及超声黏弹性生热原理;最后采用单一变量法分析超声换能器的主要结构参数对其纵振频率及工具头前端质点最大振幅的影响,将其实际输出的纵振激励加载于熔融聚合物,研究其结构参数对聚合物超声黏弹性生热过程及达到聚合物玻璃化转变温度所用时间的影响。结果表明,随纵振激励作用时间的增加,聚合物温度非线性升高;放大比对聚合物温度变化影响最大,前盖板厚度和工具头长度次之,影响最小的是变幅杆长度。     

工艺参数对注塑件熔接痕性能的影响

概述了注塑件熔接痕的分类及特点；分析了工艺参数主要包括熔体温度、模具温度、充模速度、注射时间、注射压力、保压压力、后处理等对熔接痕的外观及性能的影响。着重阐述了各工艺参数对熔接痕性能影响的研究进展；综述了优化工艺参数和研究工艺参数对熔接痕影响程度的研究以及数值模拟技术，并从工艺方面提出了减小熔接痕损害的方法。     

硝酸磷肥中和料浆的浓缩

通过对硝酸磷肥中和NP料浆浓缩过程和Norsk-Hydro专利设备NP蒸发器的分析研究,揭示了硝酸磷肥生产中和料浆浓缩的规律和NP蒸发器的特点.     

Structure of the Burning Surface of Powder under Conditions of Blowing

The surface structure (roughness) of ballistite powder burning under conditions of blowing past the surface is studied. The parameters varied in experiments are the caloricity of powders, the burning rate, the pressure, and the blowing velocity. Regular macroscopic roughness is found on all the specimens examined. A dependence of the roughness height on the blowing velocity and pressure is established. A formula for evaluation of the reduced height of the roughness is derived. Based on the analysis of experimental data, a hypothesis on the roughness-formation mechanism under conditions of blowing is proposed.     

65台框架支承式塔设备自振周期的实测与分析

对６５台框架塔的自振周期和振型进行实测,发现基本振型与落地塔不同,塔体呈弯曲变形而框架部分呈剪切变形。根据实测自振周期进行数理统计分析提出自振周期经验公式。并用哈密顿原理,推导出计算振型的理论公式可供设计应用。     

气膜冷却对叶栅端壁二次流的影响

通过对两种叶栅流道端壁气膜冷却的数值模拟,分析比较了流道内部的损失和气流落后角等气动参数,得到了以下几个结论：端壁气膜冷却对于叶栅端壁静压分布影响不大,几乎没有改变端壁横向压力梯度.吹风比m=1时的端壁气膜冷却对于反动式叶栅影响较大,有效抑制反动式叶栅的二次流发展.而对冲动式叶栅,端壁气膜冷却影响并不明显.冲动式叶栅出口端壁附近出现了一个低温的反向涡流,这个涡流的形成与端壁气膜冷却喷射、角涡、叶栅中部吸力面壁面分离密切相关.