Non-destructive Testing Robots （NDTBOTs） for In-Service Storage Tank Inspection

Petrochemical storage tanks are generally inspected when the tank is offline mostly to assess the extent of underside corrosion on the tank floor. Emptying, cleaning and opening a tank for inspection take many months and are very expensive. Inspection costs can be reduced significantly by inserting robots through manholes on the tank roof to pertbrm non-destructive testing （NDT）. The challenge is to develop robots that can operate safely in explosive and hazardous environments and measure the thickness of floor plates using ultrasound sensors. This paper reports on the development of a small and inexpensive prototype robot （NDTBOT） which is designed to be intrinsically safe for zone zero operation. The robot ＂hops＂ across the floor to make measurements, without any external moving parts. The paper describes the design, experimental testing of the NDTBOT and presents results of steel plate thickness measurements made under water.

加氢裂化在用反应流出物空冷器管束的检验

加氢装置反应流出物空冷器 (以下简称 :REAC)结构特殊、失效机理复杂 ,某国产化REAC的管束曾发生泄漏爆管事故。对某企业其余REAC带翅片碳钢管束采用远场涡流、内窥镜、超声波等检测方法进行了检验 ,本文提出了有关在用REAC的检验方法。

国家治理体系建设的微观经济后果研究——基于巡视监督的准自然实验

国家治理体系建设为我国经济的高质量发展提供了有效的保障。本文以中国沪深A股制造业上市公司为研究对象,从巡视监督的视角考察国家治理体系建设的微观效应。研究发现:短期来看被巡视企业会出现消极的资本市场反应;但长期来看巡视监督能够显著提高企业绩效,通过提高生产效率、存货管理效率以及降低第一类代理成本等路径实现;异质性分析结果表明,巡视级别越高、市场化程度越低,巡视监督引起的短期市场反应越强,对企业绩效的提升作用也更为显著。本研究丰富了国家治理体系影响实体经济的文献体系,对于推动我国经济高质量发展有着积极的作用。