可移动激光再制造修复平台设计与实验

目的与其他修复技术相比,激光修复技术具有较明显的技术优势,现有成套激光修复设备成本较高,多为固定式,难以面向现场修复。为此,面向现场待修复零件构建可移动激光再制造修复平台,以实现典型零件的三维有效修复。方法设计龙门式主体结构的分体式修复工作台,由单模组铝型材结构和滚珠丝杆型直线模组构成运动框架,采取双z固定x轴形式和机械连接式可移动底座。设计三轴并联步进电机驱动及限位控制电路,实现各轴同步控制及运动。建立基于Atmega2560主控板和Ramps1.4扩展板的控制系统,通过Marlin固件配置行程、限位和精度等主要参数,编译对应控制程序。结合正逆向技术和路径规划,实施典型曲面结构涡轮零件和预置坡口缺陷零件的激光修复实验。结果设计的分体式平台工作尺寸为750 mm×1000 mm×550 mm,结构运行平稳,重复定位精度为±0.03 mm。修复的零件表面质量高,组织致密,无内部缺陷。结论所设计的可移动激光再制造修复平台可对曲面薄壁件和较大缺口件等实施有效的现场修复,具备可操作性和实用性。

海上平台导管架修复工艺验证及其性能评价

某海上平台导管架出现裂纹,修复方案为使用水泥进行加固,在导管架上安装卡箍,使导管架周围形成密闭空间,在此空间灌入水泥,水泥固化后,起到加固作用。该修复技术在国内海上平台导管架领域尚属首次应用。为了验证其可靠性和可行性,文章针对该技术实施的关键因素进行了试验检测和试制验证研究。研究结果表明,该修复技术的原材料性能、水泥与立管的结合强度以及水泥泵送工艺和性能均满足技术规格要求,并已成功应用于现场实践。

吉林省急诊创伤整形修复治疗平台互联网+建立的实践探索

建立吉林省急诊创伤整形修复治疗平台,借助目前的电话、互联网、企业号、微信群和微信公众平台等自媒体手段,联合全省多家医院创建吉林省急诊创伤整形修复平台,帮助患者实现实时会诊、转诊、分级诊疗。目前,已完成"96608"号码应用、互联网系统的建设。成功转诊患者213例,网络实时会诊321例,与全省80余家医院建立合作,形成面部创伤救治体系。急诊能够直接反应国家医疗服务能力,创伤平台的建立缩短了接诊、转诊时间,提高了救治效率。

基于Cesium的土壤污染修复监管平台构建方法

为了解决农田污染修复工程存在的实时在线监管功能缺乏、在线交互性差等问题,本文构建了土壤污染修复监管平台。平台采用倾斜摄影技术实现了三维场景的构建,应用智能感知技术实现了土壤修复区域数据的实时采集。该平台集成Cesium开源架构,实现智能感知数据与三维场景的融合、修复成效对比、浏览器端三维可视化表达等功能。该平台基于开源库从底层开发,增强了平台可扩展性和灵活性,大大降低了系统开发的成本。

地铁信号系统后备电源修复可行性研究

针对广州地铁1号线信号系统后备电源出现蓄电性能下降及蓄电池电压过低的问题,提出在自主搭建的充放电平台上,采用深度充放电的方法,通过实时在线监测修复后带负载放电的蓄电池储电性能,证明该方法可以有效修复镍镉铅蓄电池储电性能下降及蓄电池电压过低的问题。

Experimental study on the repair of tibial plateau defect

Objective： To evaluate the effect of autograft bone, allograft bone, calcium sulfate bone cement, and calcium phosphate bone cement on the repair of tibial plateau defect in rabbits. Methods： We used autograft bone, allograft bone, calcium sulfate bone cement, and calcium phosphate bone ce ment to repair tibial plateau defect in rabbits. Gross and histo logic observations, Xray examination, and biomechanical test were conducted at 1, 2, 4, 8 weeks after operation. Results： Xray examination found that the bone den sity was evidently reduced in calcium sulfate group at 8 weeks after operation; there were no marked changes in other groups. The maximal load measurements showed that autograft and allograft groups were greater than calcium sulfate and calcium phosphate groups at 1 and 2 weeks after operation. However at 4 and 8 weeks after operation, no significant difference was found among the four groups. In autograft and allograft groups, there was no significant difference in biomechanical intensity at 2, 4, and 8 weeks,but it was significantly higher than that at 1 week. In cal cium sulfate and calcium phosphate groups, the outcome was ranked in descending order as 1 week〈 2 week〈 4 week =8 week. Histologic examination found a great amount of new bones at 8 week in both autograft and allograft groups. In calcium sulfate group, calcium sulfate was almost absorbed and there were numerous bone trabeculations. There was a large amount of unabsorbed calcium phosphate in calcium phosphate group. Conclusion： At 12 weeks postoperatively, the biome chanical intensity is higher in autograft and allograft groups than calcium sulfate and calcium phosphate groups, but after 48 weeks, there is no significant difference among groups. At 12 weeks, the biomechanical intensity in all groups is increased, but at 48 weeks, there is no significant increase. The rates of absorption and bone formation are quicker in calcium sulfate group than calcium phosphate group.