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According to the status of coal mine underground so many colliery accidents ,The system uses $3C2440A as the master chip,exploiting user operation GUI by Qt integrated development environment, combining with the embedded Web server and CGI technology. It designs a new-type mine safety monitoring system with field control and remote monitor as a whole, the system possesses efficiency ,strong real-time property and clear structure , All of the components achieve the expected goals, realizing to transmit the video data and check all the parameters of the underground site . The test proved scheme is feasible and has good market prospected. [ABSTRACT FROM AUTHOR]

The type testing conditions of the IEC standards for harmonic current measurement about the vacuum cleaner is analyzed. It is found that the testing conditions of vacuum cleaner for harmonic current play important role in the final test results. The Fourier analysis of the harmonic current measurement with the influence of the type tes- ting conditions is introduced. Rational processes for the harmonic current measurement of the non-continuously adjustable vacuum cleaner products,as well as the cleaners not achieving near to the 90 firing-angle products,are provided. According to the comparison and analysis of the test results from two different measurement processes with the same sample, it is found that the information of operation conditions of cleaner is needed urgently for harmonic current standard, which corresponds well with the actual operational procedures. [ABSTRACT FROM AUTHOR]

Eccentricity and excessive mass often appears in rotating parts. In this paper, center-of-gravity position and mass are optimized and the optimal design project is gained by taking suction mouth as an example, using Pro/E's behavioral modeling, the reasonableness of the suction mouth is improved [ABSTRACT FROM AUTHOR]