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The dielectric properties of anthracite and bituminous coals were investigated in the terahertz (THz) frequency region from 100GHz to 500GHz. We developed two types of THz material measurement systems that can be operated in this frequency region, including one based on a vector network analyzer (VNA) with frequency extension modules, and another based on a THz time-domain spectroscopy (TDS) system...
Millimeter wave (mmW) propagation parameters including transmission, attenuation, and reflection coefficients of coal were obtained experimentally in the frequency region of W-band (75–110 GHz). In addition, a raster scanning mmW imaging system including reflection and transmission modalities was developed, which forms images according to the difference between the dielectric parameters of cracks...
The dielectric properties of Shanxi anthracite and Shandong bituminous coals in China are investigated in the low-terahertz (THz), W-band of frequency from 75GHz to 110GHz for the first time. In this frequency range, the complex dielectric constant of coal samples is obtained using the free space method. It is found that both the real parts of the dielectric constant for bituminous and anthracite...
During the twelfth Five-Year Program of China, three wind power bases with capacity greater than 10 GW will be established in North China. Rapid development of wind power brings opportunity and challenge to the North China Power Grid. With the analysis of the difficulty in wind power utilization, referring to the Renewable Portfolio Standard (RPS), based on the power retail mode, a novel conception...
This paper analyses the factors which affect the outlet temperature of the cement decomposing furnace, considers the condition when the raw material transient feeding is volatile as a special condition, calculates the GM (1,2) model by using the sampling data. Under the special condition, the GM(1,2) model is used to predicte values. While under normal conditions the latest GM (1,1) prediction model...
This paper discussed the application of virtual reality technology and its application on prevention of coal and gas outburst in coal mine. With the help of virtual reality technology, the vivid and process of coal and gas outburst in coal mine could be obtained. The application of virtual reality technology on prevention of coal and gas outburst included development such as system requirements, data...
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