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The traditional harmonic current detection algorithm is cumbersome and complex to implement in MCU. A practical single-phase ip-iq harmonic current detection algorithm is proposed in the paper. According to the characteristics of single-phase circuit instantaneous harmonic and reactive current,the algorithm decompose single-phase grid current based on instantaneous reactive power theory. The new algorithm...
Fuzzy control was used to control a vertical rotary invert-pendulum with single fulcrum due to its complex characteristics in this paper. Movable equation of the inverted pendulum was derived, according to the dynamics analysis method of Lagrange. By system feasible approximation, an easily analytical math model was deduced. At the same time, the fuzzy logical tool package of MATLAB was used to build...
This paper put forward the concept of green mining of coal mine, expounds the connotation and technique system of it. The theoretical basis of green mining is that the law of after mining the key strata in movement formed abscission layer and joint fractures, the seepage rule of the gas and groundwater in broken rock. The main contents of green mining technology include: water mining, mining under...
Mine earthquake is one type of the mine dynamic phenomena that threats the safety production of mine with the mining depth increasing, the frequency and intensity of the mine earthquake are increasing in the mine, which bring the huge stress to safety production. According to the record of mine earthquake provided by Pingdingshan Seismological Bureau, analysised the b-value sequential characteristic...
Emergy analysis system was established for eco-campus, different types of emergy can be unified into a comparable value; through analysis, the range reflects the economic environment and emergy indicators. It combines socio-economic system with natural system to form comparable entity. Depending on the data of Tianjin Polytechnic University old campus, new campus and Tianjin University, emergy analysis...
The application of nitrate is an accepted procedure to manage eutrophication municipal rivers by controlling the phosphorus release from sediments into overlying water and offering electron acceptor for microorganism metabolism. An in-situ-experiment was carried out to oxidize the sediment by direct calcium nitrate injection. Phosphorus release from sediment injected calcium nitrate was almost stopped...
Construction eco-campus is required for building economy society activity in which university should lead the way to play the role beacon of society. Construction eco-campus is a system project which need informatics support for enhance the efficiency in designing plan, monitoring implement, evaluating construction effect, and putting forward improving suggestion. In this paper, SD-MOP-MAE integrated...
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