Acoustic Non-Destructive Testing Technology in Concrete Bridge Inspection and Pile Foundation Detection

This article takes the actual construction project of a certain concrete bridge project as an example to analyze the application of acoustic non-destructive testing technology in its detection.It includes an overview of a certain bridge construction project studied and acoustic non-destructive testing technology and the application of acoustic non-destructive testing technology in actual testing.This analysis hopes to provide some guidelines for acoustic non-destructive testing of modern concrete bridge projects.

Discussion on the Status Quo of Non-Destructive Testing Technology in Highway Engineering and Strategies of Improving the Quality of Testing

Highway test and detection technology play a very important role in controlling the quality of road and bridge engineering and improving the maintenance of roads and bridges.The study of highway bridge test detection technology is both theoretically and practically useful.Road and bridge test and detection is a complicated task.With the development of science and technology,highway and bridge engineering test and detection technology has also made great progress.The continuous improvement of test and detection technology has brought good social benefits to road and bridge construction.This article discusses the problems in test and detection technology of highway bridges and how to improve the quality of test and detection.

蒸发冷却空调与风光互补发电结合使用的可行性分析

夏季,为给户外场所降温并节约电能使用,提出利用蒸发冷却空调与风光互补发电相结合的方式。本文分别介绍了这两项技术的发展现状、原理及特点,并通过风洞模拟自然界风力带动风车发电,再与光伏板进行互补发电实验,得出其互补发电功率为166.4W,能够带动一台额定功率为170W的蒸发式冷风扇平稳运转。这两项技术的有效结合是一种绿色、低碳、环保的降温和能源利用方式。

Current Trends and Perspectives of Detection and Location for Buried Non-Metallic Pipelines

Buried pipelines are an essential component of the urban infrastructure of modern cities.Traditional buried pipes are mainly made of metal materials.With the development of material science and technology in recent years,non-metallic pipes,such as plastic pipes,ceramic pipes,and concrete pipes,are increasingly taking the place of pipes made from metal in various pipeline networks such as water supply,drainage,heat,industry,oil,and gas.The location technologies for the location of the buried metal pipeline have become mature,but detection and location technologies for the non-metallic pipelines are still developing.In this paper,current trends and future perspectives of detection and location of buried non-metallic pipelines are summarized.Initially,this paper reviews and analyzes electromagnetic induction technologies,electromagnetic wave technologies,and other physics-based technologies.It then focuses on acoustic detection and location technologies,and finally introduces emerging technologies.Then the technical characteristics of each detection and location method have been compared,with their strengths and weaknesses identified.The current trends and future perspectives of each buried non-metallic pipeline detection and location technology have also been defined.Finally,some suggestions for the future development of buried non-metallic pipeline detection and location technologies are provided.

纳米黏结剂修补复合材料的胶接界面损伤演化行为研究

本文在环氧树脂中添加0.1wt%的纳米纤维素以制备纳米黏结剂,旨在改善环氧树脂黏结剂的机械强度以及柔韧性,从而提高其修补效率和耐久性。将声发射技术和数字图像相关技术结合,研究弯曲载荷下复合材料内部的力学行为和变形损伤。通过声发射特征信号的分析、聚类处理与全场/局部应变和位移的测量,对不同修补结构的失效机理进行深入讨论。结果表明:与环氧树脂黏结剂相比,纳米黏结剂具有更好的黏结效果,展现出较高的能量吸收和载荷转移能力,修补试件的失效载荷和最大位移分别提高了3.1%和6.1%。聚类分析结果和内部损伤的声发射响应可以用来评估修复性能并获得主要损伤模式,不同修补试件胶接界面上的变形场有助于监测胶层内损伤的起始和扩展。将声发射特征响应与内部变形损伤建立联系,成功实现了胶接修补界面的损伤行为演化。

海外在华研发投资促进了我国技术创新——基于互补性检验的实证研究

本文基于技术创新拓展模型,检验了不同技术密度的海外研发投资与我国不同类型研发投资的互补性,并研究了其对我国技术创新的影响。研究结果表明,低技术密度海外研发投资的挤出效应大于溢出效应,会抑制我国技术创新;高技术密度海外研发投资的溢出效应大于挤出效应,会促进我国技术创新。在此研究基础之上,本文对产生这种结果的原因进行了详细阐述,并给出了相关政策建议,对我国海外研发投资的引进、管理具有一定的参考价值。