袖阀管注浆在垂直防渗工程中的应用

日照市某垃圾处理厂周边岩体风化严重,为减小风化裂隙导致的渗滤液侧渗对下游环境的影响,采用了袖阀管注浆的垂直防渗措施。介绍了袖阀管注浆的施工方法与质量控制要点,概述了施工中容易出现的问题并提出了处理措施。     

The influence of oxidation reduction potential and water treatment processes on quartz lamp sleeve fouling in ultraviolet disinfection reactors

Ultraviolet (UV) disinfection systems are incorporated into drinking water production facilities because of their broad-spectrum antimicrobial capabilities, and the minimal disinfection by-product formation that generally accompanies their use. Selection of an optimal location for a UV system within a drinking water treatment facility depends on many factors; a potentially important consideration is the effect of system location on operation and maintenance issues, including the potential for fouling of quartz surfaces. To examine the effect of system location on fouling, experiments were conducted at a groundwater treatment facility, wherein aeration, chlorination, and sand filtration were applied sequentially for treatment. In this facility, access to the water stream was available prior to and following each of the treatment steps. Therefore, it was possible to examine the effects of each of these unit operations on fouling dynamics within a UV system. Results indicated zero-order formation kinetics for the fouling reactions at all locations. Increases in oxidation reduction potential, caused by water treatment steps such as aeration and chlorination, increased the rate of sleeve fouling and the rate of irradiance loss within the reactor. Analysis of metals in the sleeve foulant showed that calcium and iron predominate, and relative comparisons of foulant composition to water chemistry highlighted a high affinity for incorporation into the foulant matrix for both iron and manganese, particularly after oxidizing treatment steps. Fouling behavior was observed to be in qualitative agreement with representations of the degree of saturation, relative to the metal:ligand combinations that are believed to comprise a large fraction of the foulants that accumulate on the surfaces of quartz jackets in UV systems used to treat water.     

基于三角模糊数的汉服袖型感性评价北大核心CSCD

为探究消费者对汉服袖型的感性认知,帮助服装设计师更准确地把握消费者心理,文章选取具有代表性的8款汉服袖型,采用语意差异法收集袖型样本在6对感性形容词汇上的感性评价,将其用三角模糊数的形式进行表征,并对模糊评价结果的准确性进行检验。为得到各汉服袖型较为精确的感性评价,文章对三角模糊数进行贴近度分析,并将贴近度的结果作为依据,运用系统聚类的方法将汉服袖型分为4类。研究表明:各汉服袖型因袖宽大小、袖缘线条形状、袖长、袖口形状的不同,感性评价存在一定差异,且最终感性评价结果符合客观认知。经验证可知,利用三角模糊数能够较准确地对汉服袖型进行感性评价。     

基于ANSYS的氧传感器夹紧套模具设计

针对汽车氧传感器夹紧套的质量问题,对氧传感器及夹紧套的结构特点进行了研究,设计出了一套能将氧传感器的敏感元件与夹紧套通过冲压成形固定在一起的夹紧套冲压模具。先利用夹紧套的径向塑性变形特点,确定夹紧套周向压缩加工的工艺方式;再由模具要将压力机的竖直运动转变为夹紧套径向塑性变形所需的水平运动,从而设计出了压盖式斜楔结构的模具结构;再对模具进行了冲压载荷校核,符合模具冲压载荷不超过冲压设备公称压力这一设计规范;选择模具中压块与连接螺杆做ANSYS应力分析,以施加载荷及约束并求解,获得了应力与应变等值线图。研究结果表明,压块与连接螺杆的强度及刚度均满足使用条件且具有较高的安全裕度。     

中高速纸机烘缸轴承装置的设计

介绍在φ1830mm×6250mm烘缸轴承装置设计中采用的新技术,如锥颈轴、CARB轴承、隔热套、稀油润滑,同时探讨了降低轴承温度的原理。推荐选用CARB轴承及隔热套。操作侧CARB轴承可在轴承的内部,内圈相对轴承外圈的滑动解决烘缸的热伸长,预防轴急剧膨胀温度剧升。传动侧的有效的隔热套隔热,减少由传导引起的温度升高。     

SUS304不锈钢套内圆表面磁力研磨加工研究

使用自制的环形磁刷工具配合多轴运动电解复合磁力研磨机,对SUS304不锈钢套内圆表面进行磁力研磨加工试验,探讨氧化铝磨粒粒径、加工时间、加工负荷以及加工电流对表面粗糙度的影响。结果表明：在纯磨粒磁力研磨试验中,当磨粒粒径为3 μm、加工负荷为2 N及振动频率为4 Hz时,研磨加工10 min后,Rmax=0.198 μm、Ra=0.045 μm, 而在纯电解磁力研磨试验中,在负荷2 N与加工电流200 mA的加工条件下,研磨10 min后,Rmax=0.292 μm、Ra=0.069 μm,较纯磨粒磁力研磨效果稍差;在电解复合磨粒的磁力研磨中,当磨粒粒径为3 μm、加工负荷为2 N、振动频率为4 Hz及加工电流为200 mA时,可获得最理想的研磨结果,加工10 min后,Rmax=0.146 μm、Ra=0.033 μm,效果优于纯磨粒和电解的磁力研磨;在工具无进给的两阶段电解复合磁力研磨试验中,先使用3 μm粒径的磨粒、2 N的加工负荷、4 Hz的振动频率以及200 mA的加工电流,研磨4 min,随后更换粒径为1 μm的磨粒,研磨12 min后,Rmax=0.112 μm、Ra=0.024 μm,此时工件内表面已被加工成镜面。     

冷拔机拔模座的改进设计

介绍了冷拔机的构造及工作原理,通过对冷拔机的工作特点及钢管弯曲变形原因进行分析,提出了冷拔机拔模座及外模模套的改进措施,并在实际生产中加以应用,取得了较好的效果。     

ZL205A铝合金筒类铸件铸造工艺研究

以实际生产中发现的铝铜系ZL205A合金筒类铸件的偏析、裂纹及疏松缺陷为研究对象,根据筒类铸件的技术要求,结合ZL205A合金的工艺特性,通过对偏析、裂纹及疏松缺陷产生的原因分析,提出了新的铸造工艺方案。结果表明:通过合理优化浇注系统,提高浇注温度,改善砂芯退让性,改进低压浇注参数等措施,解决了疏松、裂纹缺陷并有效地减少了偏析缺陷的产生,产品合格率由原来的40%提高到80%。     

套管伸缩器及定位钢管桩在滨海浮船平台绳索取心钻进中的应用

随着探矿领域不断扩展,滨海探矿项目越来越多。在滨海水上钻探中,由于受海浪、涨落潮、暗流、大风等不稳定因素影响,存在钻具横向、竖向定位控制困难等问题。采用"浮船+钢管桩+伸缩器套管"工法能较好地解决这2个难题。结合工程实践,介绍了套管伸缩器及定位钢管桩在滨海绳索取心钻探中的组合应用。     

圆锥破碎机偏心轴套跳动现象的分析

首先分析偏心轴套的受力并根据偏心轴套受力情况，对其产生跳动现象的原因和产生的事故作了分析，指出了解决办法。