Magnetic Circuit Design Based on Circumferential Excitation in Oil-Gas Pipeline Magnetic Flux Leakage Detection
In the oil-gas pipeline magnetic flux leakage (MFL) detection, the qualitative and quantitative analysis can be achieved. The circumferential excitation technology is an effective way to detect or size axial direction of defects reliably; Magnetic circuit design has become the key part of this technology to meet the magnetized requirements of circumferential excitation. This paper studies the magnetized section of MFL detector of the oil pipeline. With combination of analytical method and magnetic segmentation method, the Kirchhoff magnetic equation was established with MATLAB to design a magnetic circuit calculation model. Take f325´8 pipeline as an example, calculations are carried out to choose suitable geometry parameters and material properties for magnetic circuit design. And simulation by large-scale finite element software ANSYS is carried out to verify the correctness of magnetic circuit design. It has been testified in the results that the design of magnetic circuit has completely met the requirements of circumferential magnetization.
Imitating Research on Magnetic Flux Leakage testing of Pipeline Using ANSYS
Magnetic leakage field theory in magnetic flux leakage(MFL) testing of pipeline using finite element method was researched, by which MFL conditions of pipeline defect could be imitated through fair and foul, and compensate for the limitation of magnetic dipole method. The analyzing process of magnetic leakage field using finite element analyzing software ANSYS was introduced. The effect of lift-off on MFL signal was analyzed by ANSYS and the design of the magnetizing system of MFL detector was optimized.
Teaching learning disability to undergraduate medical students
The education of doctors shapes their professional identity: who they are and how they practise. Where does the issue of learning disability fit in? What is it and of what factors should doctors in training be aware?

The training of medical students has been defined by the General Medical Council (