Tribological behavior of scar skin and prosthetic skin in vivo

The interfacial rub phenomena between scar skin and other external surfaces are a prevalent problem in everyday life. Literature on the tribological behavior of scar skin is scarce to date. In this study, the tribological behavior and comfort sensations of residual limb scar skin, prosthetic wearing skin and healthy limb skin were investigated in vivo by using UMT-II multi-specimen Micro-Tribometer under the simulated rubbing conditions between the residual limb skin and prosthetic socket. The results showed that the tribological behavior and comfort sensations differ remarkably among the three kinds of skin. Due to the changes of skin histological structure and surface roughness, higher the friction coefficient with higher fluctuation has been obtained for the scar skin during testing. The friction coefficients of the prosthetic wearing skin are close to those of the healthy skin, but have a slight fluctuation compared to those of the healthy skin. The scar and healthy skins are sensitive to the comfortless sensations induced by rubbing. The prosthetic wearing skin is tolerant to the comfortless sensations.     

含纳米镍粉锂基润滑脂的制备工艺

为提高传统锂基润滑脂的摩擦学性能,通过四球试验机研究镍粉的加入方式、粒径、添加量对锂基润滑脂摩擦学性能的影响,采用SEM和EDS等对磨斑形貌和成分进行分析表征,对其抗磨减摩机理进行初步探索。结果表明,在润滑脂中直接加入镍粉的摩擦学性能更好,粒径为20 nm的镍粉对润滑脂摩擦学性能改善最为明显,随着镍粉添加量的增加,润滑脂的摩擦因数和磨斑直径均先减小后增加,且添加量为2.5%时润滑脂的摩擦学性能最好,摩擦因数和磨斑直径分别较基础锂基润滑脂减小了38.03%和41.77%。镍粉加入到锂基润滑脂中能起到填平犁沟,修复磨痕表面的作用。     

非剥脱性Lux1540nm点阵激光在浅表瘢痕治疗中的护理

目的:探讨非剥脱性lux1540点阵激光治疗浅表性瘢痕的护理.方法:对86例浅表性瘢痕患者进行lux1540点阵激光治疗,同时给予全方位护理(治疗前、后护理、治疗配合)等措施,探讨本护理方案对提高治疗效果,减少治疗后不良反应及并发症,提高患者舒适度和满意度的重要性.结果:经过6次疗程的治疗和护理,86例患者瘢痕皮肤的外观、质地、色泽等有明显改善,色素沉着低.结论:非剥脱性lux1540nm激光治疗浅表性瘢痕无创、安全、疗效较好.实施全方位护理,可以提高治疗效率;减少治疗后不良反应及并发症;提高患者的舒适度和满意度.     

Starlux1540nm在浅表瘢痕治疗中的疗效观察以及护理

目的:探讨Starlux1540nm激光治疗面部浅表性瘢痕的护理方法.方法:对100例面部浅表性瘢痕患者进行Starlux1540nm激光治疗,同时给予心理护理、宣教、术中配合、术后护理等护理措施,总结探讨该护理方案对提高治疗效率,减少术后反应,提高患者舒适度的重要性.结果:经过5次的疗程的治疗和良好的护理,100例患者瘢痕外观有明显改善,皮肤光洁、亮泽,没有明显色素沉着.显效80例,占80％:有效20例,占20％.结论:Starlux1540nm激光治疗面部浅表性瘢痕微创、安全、效果好.实施良好的护理对策,可以提高治疗效率;对治疗效果有辅助作用,提高患者的舒适度和满意度.     

一种阀座的胎模锻成形工艺

胎模锻是一种常用于小批量生产的零件毛坯成形方法。在分析某阀座结构的基础上,根据工厂实际情况,确定对其采用胎模锻成形方法进行制坯,给出了其具体的胎模锻工艺。并设计了相应的模具。     

Preliminary Study on the Seizure Trend of a MOM-THP with Self-directed Balls

This work continues the approach of one of our topics relating to a MOM-THP （metal on metal-total hip prostheses） with self-directed movement balls. Experiments revealed a certain seizure in some strain conditions. Laboratory trials for balls/plane Hertzian contacts have been restarted in order to determine seizure behaviour depending on the roughness of the flat area. The trials have been carried out in BSF （body simulated fluid） lubrication conditions, much closer to the real operating conditions up against the initial tests with distilled water. Seizure burdens to different loadings and contact surfaces roughness influence over the seizure burden have been determined. Even though the minimum value of the wear must be the same with the minimum value of the surfaces roughness, given the experimental conditions, it came out from the trials results on wear that the lowest level of wear is acquired at a certain value of roughness, not at the lowest level of roughness.     

连铸准沸腾钢盘条表面缺陷原因分析及对策

通过对准沸腾钢盘条各类表面缺陷的研究,对表面缺陷进行了分类,通过分析提出了相应的技术措施,在生产中实施后获得良好的效果,使准沸腾钢盘条的表面质量得到了较大的提高。     

汶川地震灾区泥石流启动机制及其动力学特征——以北川县五星沟为例

2008年5月12日,四川汶川发生8.0级特大地震,地震造成了大量山体滑坡、崩塌、泥石流等次生地质灾害,给北川县带来了严重的人员伤亡和财产损失。受降雨影响,位于北川县擂鼓镇的五星沟分别于2008年9月24日及2009年7月17日发生特大型泥石流,造成了五星沟沟内五星村、大田村和南竹村等多处居民点被冲毁,沟谷两侧房屋倒塌或被掩埋。根据已有资料,通过分析五星沟泥石流的分布和形成特征,从泥石流形成的物源条件和动力条件两方面探讨了该泥石流启动机制与物源转化机制,推算不同设计频率下泥石流的特征值,包括该泥石流的运动及动力特征。分析表明:五星沟大部分支沟属中频泥石流沟,发展阶段均属发展期;五星沟具备再次发生泥石流的基本条件,建议尽快对其实施应急治理。开展五星沟泥石流启动机制的研究,对于监测与治理汶川地震造成的次生泥石流灾害,具有指导意义。     

热轧带钢结疤缺陷产生原因及控制

针对某热轧带钢厂带钢表面结疤缺陷的外形特征及分布规律,分析了该缺陷产生的原因。通过对精轧侧导板开度余量及短行程数值设置固化、优化电气控制程序确保剪前导板线性化、精轧侧导板上安装压力传感器等措施,有效降低了结疤缺陷发生率。     

耐候H型钢圆角翘皮缺陷的成因分析与改进措施

针对马鞍山钢铁股份有限公司大H型钢分厂生产的Q345NQR2耐候H型钢圆角翘皮缺陷问题,采用金相显微镜和扫描电镜分析的方法,分析了缺陷形成原因.结果表明,翘皮缺陷与基体存在明显分层,为热轧工序孔型不合理,万能轧制时轧辊圆角对轧件圆角切肉,轧制过程中把金属压入轧件所致.通过优化开坯机孔型、调整万能轧机水平度等措施,有效减...