This contribution deals with the practical verification of several innovative non-destructive monitoring concepts for the corrosion and fracture identification of tendons in prestressed concrete structures based upon a three level corrosion monitoring strategy. At first by means of filament-sensors, consisting of several parallel mounted thin iron filaments, the penetration of the depassivation...

In order to maintain the availability of electricity supply, a failure at power plant is mandatory be prevented. If damage has occurred, analysis root cause must prioritized resolve problem and prevent further damage. One important units in boiler that role as steam generator producing by changing water liquid vapor phase. The quality (feed) becomes one crucial factor determining lifetime boile...

Abstract This article presents a generic, objective and evidence based forensic study of 4 very different Chinese bronze mirrors. The work was done within the Architectural Conservation Laboratory (ACLab), Department Physics, Faculty Medicine also Planetary Spectroscopy Mineralogy (PSML) all at University Hong Kong. mirrors nominally cover period Warring States (475–221 BC), Han (206 BC to 220 ...

INTRODUCTION Automation of ultrasonic testing procedures is a kind of non-destructive testing procedures, which is involves the use of both longitudinal and transverse high-frequency sound waves for the exploration and/or mapping of both surface and sub-surface defect or irregularities. Of course the material thickness or the material loss (corrosions/ erosions) can also be observed by the conc...

This paper describes a new stereo vision system for 3D visual inspection. 2D visual inspection is a typical method to assess a structure visually for corrosion and cracks, as well as other irregularities. However, if we use 3D shape information in addition to the 2D pattern, we can locate defects more clearly and exactly. Stereo vision is a process of recreating 3D spatial information from a pa...

The reporting of ammonia (NH) and hydrogen sulfide (HS) emissions from dairies to the federal government depends on the magnitude of the emissions. However, little is known about their daily NH and HS emissions and what influences those emissions. Emissions of NH and HS from two manure storage basins at a 4400-head western free-stall dairy were measured intermittently over 2 yr. Each basin went...

Eutectic god-tin (Au80Sn20) is widely used as the die-attach material for making radio-frequency (RF) and microwave devices. The metallic bonding is typically achieved by soldering using a gold-tin preform in a forming gas containing hydrogen (H2) and nitrogen (N2) to a peak temperature at 300 ̊C. The performance and reliability of the devices are strongly dependent on the quality of the die-att...

The iNEMI technical subcommittee on creep corrosion is developing a flowers-of-sulfur (FOS) based qualification test for creep corrosion on printed-circuit boards (PCBs). The test setup consists of a 300-mm cube chamber with two means of mounting the test specimens and flowing air over them to expose them to constant, predefined humidity and temperature conditions and sulfur and other contamina...