大圆筒重力式码头漏砂的原因分析和处理

基于受力条件好、投资省、便于施工等明显的优越性，大圆筒结构在南方许多港口广泛应用。针对大圆筒结构常存在的圆筒间接缝漏砂的问题，提出了一种简单易行的处理方法。     

快速修复技术在潜艇维修中的应用

结合潜艇机电设备发生的损伤和故障，分析了纳米减摩、等离子喷涂、复合材料微波堵漏、电子设备快速清洗等机电设备损伤修复技术在潜艇现场维修中的应用。     

Development of a model for an air brake system with leaks and a scheme for the estimation of the steady-state pushrod stroke

Brake systems in trucks are crucial for ensuring the safety of vehicles and passengers on the roadways. Most trucks in the USA are equipped with S-cam drum brake systems and they are sensitive to maintenance. Brake deficiencies such as leaks and out-of-adjustment of the pushrod are a major cause of accidents involving trucks. Leaks in the air brake systems drastically affect braking performance by decreasing the maximum attainable braking pressure and also increasing the time required to attain the same, thereby resulting in longer stopping distances. Out-of-adjustment of the pushrod leads to loss of braking torque even if no leaks are present in the air brake system. In this paper, we present a mathematical model for an air brake system in the presence of leaks, with a view towards developing a diagnostic system for the air brake system based on the models. Additionally, we present a scheme that estimates the severity of leak in terms of the mass flow rate of air leaking from the air brake system to the atmosphere. This scheme can be implemented using a simple look-up table. We also present a steady-state pushrod stroke estimation scheme, based on brake chamber pressure measurements in the absence of any leaks in the air brake system.     

帷幕注浆施工技术在隧道断层破碎带中的应用

结合工程实例,介绍了帷幕注浆堵水及加固技术在宜万铁路野山关隧道出口段F18断层破碎带施工中的应用,并且较为详实地阐述了注浆方案、参数设计和施工工艺。