摘要：凸轮从动件的多余振动将造成系统的力、噪音、磨损和工作成本增加,本文采用凸轮轮廓输入成形来减少振动,输入成形是一种实际的时间控制算法,它是为计算机控制器开发的,为了应用凸轮设计概念,必须建立某些修正算法。采用可变的工作速度和从动件动力学建造一试验装置来检验高速输入外形凸轮轮廓的效能。试验结果表明本文推荐的解决方法是有用的。

摘要：可变向直接铺管法(DSPT)是一种将钢管道安装到钻孔中的常用方法,它使用管道推进器进行控制,通常在设计的钻孔路径上安装。DSPT通常被描述为水平定向钻掘(HDD)和微隧道(MT)的组合,因为DSPT具有类似于微隧道的操作和行为特征,同时允许安装与HDD安装类似的几何特征的管道。然而,了解DSPT的特点以及它们与微隧道和HDD相比较的差异对于确定和分析推力发展机制、意外返回风险以及管道在钻孔中的行为至关重要。本文将DSPT方法与微隧道和HDD进行比较,以建立对这两种技术及其相关设计和施工最佳实践与技术之间关系的基础。

摘要：详细阐述了第一代葡萄牙风景园林大师弗朗西斯科·卡德拉·卡法兰的求学和工作历程,着重介绍了他在葡萄牙风景园林教育和研究上取得的卓越成就,创立专业的实践课程并为教育系统奠定基础,使其成为欧洲风景园林行业先锋之一。法兰卡还积极参与风景园林实践,从私人庭院、公园到农场建设、水利灌溉以及当地和周边的景观规划都有所涉及,设计了设计了国家体育馆、阿格莱拉庄园和其他在全球各地的精典作品。

摘要：Aims: The FREEZE-cohort study (NCT 01360008) is a prospective observational, multicenter and multinational study to evaluate safety and effectiveness of cryoballoon ablation for pulmonary vein isolation as compared to radiofrequency ablation in patients with paroxysmal or persistent atrial fibrillation (lasting < one year) under the conditions of clinical routine. Methods and Results: The study started in 2011 and anticipates inclusion up to 2000 patients in each of the two treatment groups. A total of 37 centers from 8 countries worldwide, all experienced in at least one of the two ablation techniques, participate in the study. The primary outcome parameter of the study is defined as atrial fibrillation recurrence rate during twelve months of follow-up. Secondary outcome parameters include primary success rates, complication rates in general, specific complications with respect to phrenic nerve palsy and pulmonary vein stenosis, radiation exposure, clinical course including death and repeat ablation. Finally specific procedural aspects will be evaluated in a descriptive manner. Preliminary data of the first 1882 patients show that in clinical practice cryoablation is preferentially performed in patients with paroxysmal atrial fibrillation, whereas application of radiofrequency ablation is equally distributed between patients with persistent and paroxysmal atrial fibrillation. Conclusion: Based on multi-center and multi-national data the FREEZE-cohort study will provide important information on long-term efficacy, clinical effectiveness, complication rates and procedural differences between atrial fibrillation patients treated with either cryoablation or radiofrequency ablation.