Eddy current is presented in electric coil when it approaches metallic conductor. Different metals have different conductivity and permeability. Therefore, the equivalent impedances of the electric coil are also different. Based on the principle, a Steel material sorting instrument was made to detect the steel permeability level, through the permeability level, combined with the central processing circuit steel hardness values reflect iron parts, materials and the carbon content of steel, mixing nondestructive sorting.
The application of cloud computing technology provides a new idea for the development of mobile learning.Based on the analysis of the advantages of cloud computing to support mobile learning, The paper presents a complete design and application of mobile learning system based on cloud computing ,effectively to promote independent learning and collaborative exchange of the students, but also to provide the reference for the solution of mobile learning system based on cloud computing.
Using the matrix compression algorithm in the network education platform for the user information security certification is a good way. The sensitive user information is transfer in an open channel and it can be authentication for using the matrix compression/decompression, matrix decomposition/reduction algorithm. The client conduct random capture and compression by the user information been divided into a number of rectangular block size, corresponding to generate a key and cipher text. The server take out the corresponding data from the data queue of receiving and to extract In accordance with the key rules, then to reduce of information in corresponding positions. Thus the user identity information can be authenticity and integrity verification.
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