任意多面体消隐系统的研究

本文在相交凸多面体隐藏线消除方法研究的基础上.运用体素构形的方法.进一步探讨了凹多面体的数据结构以及凹多面体在不同情况下隐藏线消除的可能性,从而建立了一个任意平面体的消隐系统.     

液力耦合器倒置反传动在庙岭煤码头的应用

1 液力耦含器结构原理与功能分析 液力耦合器又称液力联轴器,是一种依靠液体动能传递扭矩的传动部件.主要由输入轴、输出轴、泵轮、涡轮、外壳和易熔塞等构件组成.正常使用情况下,输入轴一端与电动机相联,另一端与泵轮相联;输出轴一端与涡轮相联,另一端与工作机相联.泵轮和涡轮基本对称分布,都是具有径向叶片的叶轮、机壳与泵轮固联成密封腔,供工作介质在其中作螺旋环流运动以传递扭矩.其主要功能是减缓冲击,使电机轻载启动及过载保护等.常见型号有YOX调和TVA等系列,主要适用于启动困难的机械设备.连云港港庙岭煤码头30多台套带式输送机和大型装卸设备的传动部位大都采用了液力耦合器传动,其中大部分都能正常工作,唯独东堆场4台斗轮堆取料机的斗轮减速器高速轴经常出现断轴问题,多年来一直困扰着我们.     

BOT融资关键因素分析--从国内外BOT项目的经验教训说起

本文总结了国内外BOT项目融资成功的经验和失败的教训,分析了保证项目融资成功的8个关键因素,旨在为我国实施BOT项目提供可借鉴的经验。     

台风的预防预控

防抗台风是海事部门的重点工作之一，只有采取有效的针对性措施才能最大限度地减小损失。     

暗挖车站跨既有隧道施工技术

针对洞桩法暗挖车站跨既有隧道施工项目,通过增加施工通道,采用门式钢架加固等创新、改良工艺,解决了施工工序转换的难题,节约工程成本,降低施工风险。     

关于IE在重卡制造业中的应用

介绍了某重卡调整线运用IE手法,引入工业工程中的作业分析、程序分析、作业分析、动作分析等方法和思想,对生产线进行改善。     

纤维混凝土在港口码头工程中的应用

混凝土龟裂是港口工程质量的通病。以常熟兴华港二期工程码头面层施工为例,介绍通过在混凝土中掺入聚丙烯纤维的作用机理和功能,改善混凝土性能的效果。实践表明,该方法在克服面层龟裂方面具有较好的作用。     

Creep Life Prediction of Alloy 718 for Automotive Engine Materials

This study was carried out to investigate the creep life at the high temperature of the Alloy 718 for automotive engine components using the initial strain parameter method (ISPM). Creep tests have performed at elevated temperatures in the range of 550 oC to 700 oC in this work. We also carried out constant stress creep tests. The initial strains were measured during 1 minute after loading. Both the creep stress and rupture time depend on the initial strain. We calculated the creep life of Alloy 718 by using the creep life prediction equations obtained from the ISPM. Then, we compared the creep life predicted by the ISPM to the Larson-Miller parameter (LMP). The experimental rupture time and the calculated rupture time by using the ISPM agreed with a confidence level of 95 %. The creep life predicted by using the ISPM was in very good agreement with the creep life predicted using the LMP method.     

Transforaminal lumbar interbody fusion for traumatic lumbar spondylolisthesis

To evaluate the clinical outcome, effectiveness and safety of the surgical management of traumatic lumbar spondylolisthesis with transforaminal lumbar interbody fusion (TLIF) with short segmental instrumentation fixation. A retrospective review of a consecutive series of 24 patients with traumatic lumbar spondylolisthesis treated with TLIF procedure was carried out. Intraoperative spinal cord monitoring was used to confirm the peripheral neural function intact during the reduction of the spondylolisthesis. Preoperative clinical and radiographic evaluation of all cases were originally collected prospectively. Data regarding blood loss, operative time, duration of hospital stay, radiographic fusion, instrumentation failure and clinical result were collected and observed at regular follow-up periods. All patients were engaged in high-energy accidents in the lower back and 16 patients had concomitant injuries. The mean operative time was 124 min, mean blood loss was 350 mL, and mean hospital stay was 6.5 days. There were no complications such as incision infection, cerebrospinal fluide (CSF) leakage and nerve root injury and so on. All patients demonstrated a solid lumbar interbody fusion within 4 months, and no evidence of spondylolisthesis correction loss, instrumentation failure and loosing. They all were completely asymptomatic, with normal neurologic findings, and had resumed their previous level of physical activities on the final follow-up. Meticulous clinical examination and careful imaging assessment could assist an early diagonosis in cases of traumatic lumbar spondylolisthesis. Performing open reduction and the TLIF procedure as soon as possible could restore segmental stability and painless function. The TLIF procedure was a safe, effective technique to treat traumatic lumbar spondylolisthesis.     

试论水运建设工程质量目标的构建与实现

结合施桥三线船闸工程实例,从质量目标的确立,质量保证体系的建立等方面分析构建质量目标的实现路径,探讨工程质量的过程监控,创优载体的设立以及环境的营造等,以促进船闸工程的全面创优。