膜式水冷壁立式成排弯管机设计

膜式水冷壁成排弯管机是锅炉制造的重要设备，文中归纳总结了国内外现有成排弯管机的弯制原理、弯管方式、设备结构、技术参数、机型和各自优缺点，在此基础上提出了适用于螺旋管圈膜式水冷壁成排弯管机的设计措施和有关计算方法，并进行分析比较，图14。     

旋风除尘器二维速度间的关系

在旋风除尘器中，混合气流是作螺旋线运动的。本文确定了水平切向速度与竖直上升速度之间的数量关系并列出了公式，对确定设备适当的结构和尺寸提供了实用的计算方法。     

强化姑山选厂二段磨矿分级的试验研究

针对姑山选厂二段分级效率低的问题，介绍了采用螺旋分级机－高频细筛串联分级和用高频细筛代替螺旋分级机两种工艺的试验情况。     

64层螺旋CT冠状动脉成像图像质量控制研究

目的:总结64层螺旋CT冠状动脉成像图像质量控制经验。方法:收集我院2012年6月-2013年7月进行冠状动脉血管造影检查的患者120例,使用AquilionTSX-101A64排CT进行检查。结果:本组120例患者中,有动脉亚段全部显示清晰79例,占65.8%;四个动脉亚段单一显示不清晰29例,占24.2%;动脉亚段均显示不清12例,占10.0%。结论:64层螺旋CT冠状动脉成像检查前控制好患者心率,选择最佳的重建时相窗,可以提高冠脉的成像质量。     

滚珠型弧面凸轮分度机构的运动分析和仿真

滚珠型弧面凸轮分度机构中滚珠的运动影响到机构的润滑、失效形式和传动效率。滚珠中心、滚珠与凸轮滚道接触点及滚珠与分度盘球窝接触点相对于凸轮旋转轴线运动轨迹为螺旋曲线,计算表明3条曲线的螺旋升角大小不同。利用螺旋传动理论,分析滚珠的运动形式,计算滚珠的侧滑速度。应用RecurDyn软件对机构进行运动学仿真,验证了滚珠侧滑和锲紧的存在及负载转动惯量对分度盘运动规律的影响。     

Influence of tooth modifications on tooth contact in face-hobbed spiral bevel gears

In this study the influence of tooth modifications induced by machine tool setting and head-cutter profile variations on tooth contact characteristics in face-hobbed spiral bevel gears is investigated. The concept of face-hobbed spiral bevel gear generation by an imaginary generating crown gear is applied. The modifications of tooth surfaces are introduced into the teeth of both members. The lengthwise crowning of teeth is achieved by applying a slightly bigger radius of lengthwise tooth flank curvature of the crown gear generating the concave side of pinion/gear tooth-surfaces, and by the variation of machine tool settings in the generation of pinion/gear teeth. The ease-off in the tooth height direction of meshing tooth surfaces is achieved by applying a head-cutter whose profile consists of two circular arcs, instead of a straight-line. The method of tooth contact analysis applied determines the path of contact, the potential contact lines, the separations along these lines, and the transmission errors. A computer program implements the method. By using this program the influence of the variation of machine tool settings and of head-cutter geometry on tooth contact is investigated and discussed.     

螺旋助片管在35t/h锅炉省煤器上的应用及传热计算

介绍了螺旋助片管省煤器在35t／h锅炉上的应用，推荐了合理可行的传热计算公式。     

螺旋流排气管变型设计研究

介绍了MPC方式的螺旋流排气管变型设计,并利用改进的KIVAII程序进行了数值模拟计算。计算结果表明,增加排气支管出口截面积,改变支管出口截面结构尺寸可以改善排气系统的流通能力。     

Mechanical damage to Gram-negative bacteria by surface plating with the Drigalski-spatula technique

Colony counting by spreading bacterial suspensions on plating media by various techniques is of general concern. Comparative studies between hand plating (Drigalski-spatula technique) for different time intervals and spiral plating resulted in significant differences in colony counts. Lower counts of Gram-negative bacteria were obtained by using hand plating for more than 10 s, compared with short time hand plating (5 s) or spiral plating. Colony counting of Gram-positive bacteria showed no differences between both techniques. Further characterisation of Escherichia coli cells spread with the Drigalski-spatula technique by electron microscopy revealed a large number of damaged cells compared to control samples. The data clearly shows that the mechanical forces during hand plating are sufficient to damage E. coli cells.     

Advanced valve-regulated lead-acid batteries for hybrid vehicle applications

Future vehicle applications require the development of reliable and long life batteries operating under high-rate partial-state-of-charge (HRPSoC) working conditions. Work presented in this paper deals with the study of different design parameters, manufacturing process and charging conditions of spiral wound valve-regulated lead-acid (VRLA) batteries, in order to improve their reliability and cycle life for hybrid vehicle applications.