乳液聚合稳定性研究

本文采用正交实验，确定在选用同类乳化剂情况下，影响乳液聚合过程稳定性的最主要因素是乳化剂的用量，并从理论上探讨了适当的乳化剂用量可使乳液聚合过程最稳定。最后，从乳胶粒平均位径的测定结果进一步验证了上述理论．     

CHARACTERISTICS OF MICROCUTTING FORCE VARIATION IN ULTRAPRECISION DIAMOND TURNING

An investigation of the characteristics of microcutting forces in diamond turning of crystalline materials is presented. The characteristics of the cutting forces were extracted and analyzed using statistical and spectrum analysis methods. A series of cutting experiments were done on a copper alloy and copper single crystals with different crystallographic orientations. Experimental results indicate that there exists a dominant frequency component and a periodicity of fluctuation of the cutting forces per workpiece revolution in the diamond turning of a single crystal material. The periodicity is closely related to the crystallographic orientation of the material being cut. As the depth of cut increases, the influence of crystallographic orientation of the single-crystal materials on microcutting forces is found to be more pronounced. Moreover, the cutting force ratio between the mean thrust force and the mean cutting force is found to vary with the depth of cut, and a large ratio was observed at a small depth of cut. These findings help to explain quantitatively the periodic fluctuations of microcutting forces (and hence the materials-induced vibration) in ultraprecision diamond turning, which are not encountered in conventional machining.     

磨煤机出口分离器结构改进

阐述了山西武乡和信发电有限公司新建2×600MW机组在投运之后锅炉效率较低,分析原因认为是由于磨煤机出口分离器结构不合理,使煤粉细度不合格而导致不完全燃烧热损失较大,从而造成锅炉效率偏低,经过技术改造后,解决了该问题,锅炉效率基本达到设计水平。     

Investigation of particle in-flight characteristics during atmospheric plasma spraying of yttria-stabilized ZrO2: Part 1. Experimental

A detailed investigation of the relationship between the parameters of the spray process and the in-flight properties of the particles was carried out using a multivariate statistical approach. A full factorial designed experiment concerning the spray process was performed, the spray gun parameters’ current, argon flow rate, hydrogen flow rate, and powder feed rate being selected to control the process. The particle properties, viz. velocity, temperature, and diameter, were determined using an optical measurement system, DPV 2000. In addition, the standard deviations of, and the correlations between, the measured particle properties were analyzed. The results showed current to have the strongest impact on particle velocity and particle temperature and argon flow rate to be the only parameter with an inverse effect on velocity and temperature.     

飞机货舱典型可燃物燃烧火灾特征参数试验研究

摘 要：光电式火灾烟雾探测器是目前民用飞机货舱使用的主流火灾探测器,是保障飞机安全运行的关键,该探测器是基于烟雾颗粒对光的散射信号来进行报警的,但是由于空气中悬浮颗粒物（水蒸气或灰尘等）也具有散射效应,同样会触发火灾探测器发生报警,这种原理上的缺陷造成的误报情况时有发生。通过对飞机货舱典型燃烧物瓦楞纸片、榉木和棉绳的蓝光散射功率（表征为表面积浓度）、红外光散射功率（表征为体积浓度）和颗粒物索特平均粒径火灾特征参数进行分析,为复合探测器的研发优化火灾特征参数。结果表明：在常压条件下,蓝光和红外光对颗粒物浓度的变化有很好的响应,索特平均粒径可以区分火灾烟雾颗粒和非火灾烟雾颗粒,可以有效降低误报率。     

新型卡板式外径千分表的设计应用

针对机车牵引电机转轴磨削测量中,对转轴轴承位尺寸超差的原因进行分析,设计制作机车牵引电机转轴新型卡板式外径千分表(实用新型:ZL201420477030.7)。实际应用表明,新型卡板式外径千分表保证了牵引电机转轴轴承位的磨削尺寸,避免了转轴轴承位尺寸超差现象,解决了机车牵引电机转轴轴承位磨削测量的工艺、质量问题。     

大直径圆形双壁钢围堰施工定位技术

大直径圆形双壁钢围堰施工过程复杂,定位难,精度控制不易,受设备水平、水文条件、通航影响较大。结合福建省南平市新水东大桥双壁钢围堰项目,采用科学的组织方法,优化施工方案以达到准确定位的目标,为类似的工程提供借鉴。     

自平衡试桩法在检测大直径钻孔灌注桩承载能力中的应用

通过实践应用自平衡试桩法新技术,对大直径钻孔灌注桩承载能力进行检验,为解决施工中出现的类似问题提供经验。     

旋风分离器设计方法的研究

在理论研究和设计实践的基础上,运用Kalen及Zenz"跳跃速度"的概念,导出旋风分离器的设计方法,简洁实用,可为工业应用提供指导作用.     

Bar diameter as an influencing factor on temperature in turning

Factors such as cutting speed, feed rate, tool material, etc., are well known to have an effect on tool wear in metal turning. However, reliable methods of wear prediction over a broad spectrum of cutting circumstance remain elusive, suggesting that not all factors have been recognised as significant and thus considered. This paper demonstrates that one such factor is bar diameter. The findings are analysed in three separate ways. All tests were performed under identical cutting conditions, i.e. cutting speeds were constant as well as the feed rate and depth of cut, also the same bar was used except for varying the bar diameter. All experiments were performed in single point turning on solid carbon steel bar (BS970 080A42), by using uncoated ISO (4957) (BS 4659 BT42) HSS insert.