Introduction MRI acoustic noise represents a possible hazard to patients and volunteers undergoing scanning and to workers present in the scanner room during imaging. Vibrations in the gradient coils are generated by Lorentz forces, induced by the currents flowing through the gradient coils within the static magnetic field. The vibrations are transmitted to other parts of the scanner and finall...

Septic arthritis associated with extra-articular abscess is rare. We report on 2 non-rheumatic patients with septic arthritis of the knee associated with calf abscess. Magnetic resonance imaging showed a distinct leakage pathway from the knee joint in each patient. One was a ruptured popliteal cyst (posteromedial). Another was a pathologic popliteus hiatus (posterolateral). These patients under...

The MV/LV transformer without a tank in the underground substation can produce remarkable interference with the computer Cathode-Ray Tube (CRT) displayers above the ground, because of the generated power frequency magnetic field. To resolve such problem, a tank with high conductivity or/and high permeability is needed to enclose the transformer. To evaluate the shielding effectiveness, the fini...

Magnetic flux leakage (MFL) measurement is one of the most widely used non-destructive testing techniques for in-service inspection of oil and gas pipelines. Three methods, Numerical computation, theory analytical and experiment, have been used to model the MFL testing and have been investigated separately before. In this article, we introduced a MFL analytical model based on dipole magnetic ch...

Electron holography is applied for the study of the leakage field of thin-film ferromagnetic tips used as probes in magnetic force microscopy. We used commercially available pyramidal tips covered on one face with a thin NiCo film, which were then placed in a high external magnetic field directed along the pyramid axis. Good agreement between simulated and experimental electron phase difference...

This paper aims to design a coil sensor for corrosion monitoring of industrial pipes that could detect variations in thickness using the MFL (Magnetic Flux Leakage) technique. An is designed and tested with pipe sample thicknesses 2, 4, 6, 8 mm based on magnetic field effect ferrite cores. Moreover, measurement setup analysing samples up temperature 200° Celsius suggested. Experimental results ...

The LEP magnetic bending field and therefore the beam energy is changed by a current flow over the vacuum chamber. The current is created by trains travelling between the Geneva main station and destinations in France. Some of the rail current leaks into earth and returns to the power station via the LEP tunnel where the vacuum chamber is one of the conductors. Train leakage currents penetrate ...

In the present study, the three components of the residual leakage magnetic fields from the flaws were measured with the MI sensor. Furthermore, finite element analysis for the three components of the residual magnetic fields was carried out. From these experimental and analytical results, By showed the two pairs of the maximum and the minimum and can evaluate the flaw length. In the case of th...

This study develops a three-axis magnetic field (MF) microsensor manufactured by a complementary metal oxide semiconductor (CMOS) process. The MF microsensor contains a ring emitter, four bases, and eight collectors. Sentaurus TCAD was used to simulate the microsensor characterization. The STI (shallow trench isolation) oxide in the process was used to limit the current direction and reduce lea...

introduction: there are several methods for evaluating microleakage in dentistry, for example dye or bacterial leakage, electro-chemical methods, radioisotope labeling and fluid filtration. the purpose of this study was to assemble the fluid filtration system for quantitative evaluation of microleakage in dental materials. materials and methods: the roots were connected to a tube filled with an...