Investigation of inductively coupled RFID systems compatibility in proximity to metals

The high frequencies range, inductively coupled Radio Frequency Identification (RFID) systems are widely used for product identification. The effectiveness of RFID systems diminishes near metals. The objective of this work was to investigate how the magnetic field values were affected by the metallilc disc, and how the physical parameters of the metal impact the electromagnetic values. The RFID system simulation models consisting of a deader coil, a circular metallic disc and a tag coil were developed using COMSOL software. The flux at different positions over the disc was compared to the flux at the same positions when the disc was not present, for discs of different radius and thickness. For models developed, the ratio of electric field when metal is present to electric field when metal is not present increased away from the metal. The radius and position where values are recorded impact the value of the magnetic field notably.

Investigation of inductively coupled RFID systems compatibility in proximity to metals

The high frequencies range, inductively coupled Radio Frequency Identification (RFID) systems are widely used for product identification. The effectiveness of RFID systems diminishes near metals. The objective of this work was to investigate how the magnetic field values were affected by the metallilc disc, and how the physical parameters of the metal impact the electromagnetic values. The RFID system simulation models consisting of a deader coil, a circular metallic disc and a tag coil were developed using COMSOL software. The flux at different positions over the disc was compared to the flux at the same positions when the disc was not present, for discs of different radius and thickness. For models developed, the ratio of electric field when metal is present to electric field when metal is not present increased away from the metal. The radius and position where values are recorded impact the value of the magnetic field notably.

Experimental investigation of structural integrity behavior of High strength low alloy steel – Study of mechanical, microstructural and corrosion behavior of Submerged arc welding weldments

The present study aims at investigating the effect of submerged arc welding fluxes for enhanced corrosion resistance of structural steel welds. By varying the basicity index of submerged arc welding fluxes the corrosion resistance and mechanical properties of weld metal such as tensile strength, impact strength, microhardness in submerged arc weldments were evaluated. The result shows that with the increase in bascity index tensile strength of weld specimen reduced while impact strength and microhardness value increased. Maximum microhardness (288 HV) was observed for flux 2 while base metal show minimum microhardness value (205 HV). Flux 5 gives maximum impact strength (94.17 J) as compared to the base metal (80 J). This is due to the reduced content of oxygen in weld metal which increases the weld metal impact toughness. Corrosion resistance of weld specimen increased as compared to the base metal. Ductile fracture mode and shear lip or tears were observed in the weld zone. Shear dimples and shear lips were more severe in base metal as well as weld metal impact specimens due to the rapid effect of external forces on the impact test. The banded microstructure of delta ferrite and austenite was observed in the base metal. Fine grains of ferrite and pearlite at the center and edges were present in the weld zone.

Alkali metal impact on structural and phonon properties of Er3+ and Tm3+ co-doped MY(WO4)2 (M = Li, Na, K) nanocrystals

TEM images of NaY(WO4)2:Er, Tm nanocrystalline powders synthesized by the Pechini method after calcination at (a) 550 °C, (b) 600 °C and (c) 700 °C.

Laser Welding of New Grade of Advanced High Strength Steel STRENX 1100 MC

The article presents results of investigations on autogenous laser welding of new grade STRENX 1100 MC steel. The modern Disk laser was applied for of 5.0 mm thick butt joints welding. The influence of laser welding parameters, mainly the energy input of laser welding on the penetration shape, weld quality, structure and mechanical performance was investigated. It was found that the investigated steel has surprisingly low carbon equivalent CET just 0.328, and also relatively high temperature of martensitic transformation Msat 430.6°C. Despite very rapid cooling times t8/5in a range from 0.6 to 1.3 s, thus rapid solidification there was no tendency to cracking of weld metal or HAZ. Significant drop of microhardness in the HAZ resulted in a decrease of tensile strength of joints, compared to the base metal. Impact toughness of test joints was at only 50÷60% of the base metal.