气力输送系统落料器主轴的强度校核与改进

一例气力输送系统落料器主轴的非正常疲劳断裂，校核主轴的强度表明，产品安全系数设计偏小是造成主轴疲劳断裂的主要原因，通过改进主轴的材料和热处理、轴承定位方式以及表面加工质量，安全系数从0．97有效增大为2．53，改进后使用效果良好．     

食管破裂26例临床分析

目的:总结了26例食管破裂的诊断和治疗经验,探讨食管破裂的诊断与治疗方法.方法:1988～2004年收治食管破裂患者26例,其中男25例,女1例,年龄28～72岁.26例患者中,2例保守治疗,6例切开食管摘取异物,3例行胸腔、纵隔引流加空肠及胃造瘘术,14例行食管修补术,1例行食管内带膜金属支架植入,二期再行食管切除食管胃吻合术.结果:26例患者中23例治愈,3例死亡,治愈率88.5%.结论:早期正确诊断具有重要意义,治疗方案应在对其损伤部位、损伤时间、纵隔感染的程度及患者的全身情况进行全面分析,综合考虑的基础上加以选择.     

剖宫产427例原因分析

目的:探讨剖宫产率上升原因,寻找降低剖宫产率的可能途径。方法:统计1999-3-12～2000-4-8在张家口医学院第一附属医院427例剖宫产病历,分析各种剖宫产原因及所占比例。结果:胎儿因素197例(46.1％),其中胎儿宫内窘迫86例(20.1％);母体因素104例(24.4％),其中胎膜早破37例(8.796);母儿因素72例(16.9％);社会因素54例(12.6％)。结论:胎儿因素是剖宫产率上升的主要原因,要求剖宫产也占了很大比例,要降低剖宫产率需要医生和社会共同提高认识。     

Research Summaries for Normal Birth

In this column, the author summarizes research studies relevant to normal birth. The studies summarized include a large trial evaluating the effect of prior vaginal births after a cesarean on outcomes in subsequent births; a study linking umbilical cord blood pH with intellectual outcomes in childhood; and a prospective trial evaluating the effect of routine antenatal nonstress testing on maternal anxiety. The author also highlights four articles about normal birth in a recent nursing journal series dedicated to the topic.     

筒仓分类方法评价

提出了一种新的基于破裂面的深浅仓分类方法.该方法考虑了贮料硕面倾角的影响,可以处理贮料顶面平堆和锥堆2种工况.以此为依据,对目前工程设计中常用的2类深浅仓分类方法(即按高径比分类方法和按破裂面分类方法)进行评价.结果表明:该新方法能够根据贮料顶面锥堆或平堆给出区分深浅仓高径比的临界值范围,该范围覆盖中国规范按高径比分类方法、德国规范、Reimbert兄弟、梁传珍等现有方法所给出的区分深浅仓的高径比临界值.因此,该方法是一种区分深浅仓更一般性的方法,而现有的深浅仓分类方法只是它的特例.     

生命周期视角下运动性跟腱断裂的特征与预防

整理和分析相关文献资料及临床资料,以216名运动性跟腱断裂者为研究对象,从生命周期的视角对运动型跟腱断裂的特征进行分析,并提出了相应的预防措施。     

异径管开裂失效分析

对抚顺石化三厂白油车间一在役异径接管的开裂进行失效分析,包括开裂部件的断口观察、材质的化学成分分析、金相组织检验和力学性能测试。得出的结论是:异径接管在长期服役中,由于受迫振动而造成疲劳开裂。     

运动性闭合性跟腱断裂的研究进展

运动性闭合性跟腱断裂在临床上较为常见,由于其病理生理特点尚未完全明了,迄今为止仍是一个未完全解决的难题。作者通过对10年来运动性闭合性跟腱断裂治疗及机理研究的有关文献进行归纳总结,体现了运动性闭合性跟腱断裂的最新治疗水平和理论研究进展,以期对临床实践有所裨益。     

Greater fear of re-injury and increased tibial translation in patients who later sustain an ACL graft rupture or a contralateral ACL rupture: a pilot study

The aim was to compare fear of re-injury, patient reported function, static and dynamic tibial translation and muscle strength assessed before and 5 weeks after an anterior cruciate ligament (ACL) reconstruction between individuals who sustained a subsequent ACL graft rupture or a contralateral ACL injury within 5 years after the reconstruction, and individuals with no subsequent injury. Nineteen patients were investigated before, and 5 weeks after an ACL reconstruction with a quadruple hamstring tendon graft. At 5 years follow up, 3 patients had sustained an ACL graft rupture and 2 patients had sustained a contralateral ACL rupture. Fear of re-injury, confidence with the knee, patient reported function, activity level, static and dynamic tibial translation and muscle strength were assessed. The re-injured group reported greater fear of re-injury and had greater static tibial translation in both knees before the ACL reconstruction compared to those who did not sustain another ACL injury. There were no other differences between groups. In conclusion, fear of re-injury and static tibial translation before the index ACL reconstruction were greater in patients who later on suffered an ACL graft rupture or a contralateral ACL rupture. These factors may predict a subsequent ACL injury.     

裂纹流变可靠性研究与应用(I)

本文在流变断裂学基础上引入可靠性理论,建立了一套概率流变断裂理论,提出在考虑荷载及混凝土性能随机性的条件下,解决计及流变影响的混凝土裂纹体可靠性的分析方法。