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Copyright of Guangdong Medical Journal is the property of Guangdong Medical Journal Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Tea Science is the property of Journal of Tea Science Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ordnance Industry Automation is the property of Editorial Board for Ordnance Industry Automation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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To effectively study the characteristics of coal pore and fissures，the pore and fissures of coal were characterized by qualitative and quantitative characterization and analysis. The coal sample of 311102 working face in Bayangaole Colliery of Inner Mongolia was studied. Based on the IEISS Xradia 510 X-ray microscope Get the CT data. The mathematical algorithm was embedded in the three-dimensional visualization software AVIZO. The study proposed the methods of quantitative characterization of pore and fissure and set up a three-dimensional model of pore and fissure of coal and a pore network model with topology structure. The coal sample microscopic parameter of pore and fissures includes pore size，pore volume，porosity，coordination number and length of throat. The results show that under the micron scale the coal samples of Bayangaole Colliery are mainly in macroporous and have a cleat network. Its effective porosity is 10.34%. The number of pores is 12 834，and the number of throats is 432. These are calculated by the pore network model. [ABSTRACT FROM AUTHOR]

The mining of the close coal seam under the fire area easily leads to the occurrence of harmful gas intrusion， which seriously threatens the safe mining of the working face. The goaf upon the 30110 mining face of the Sunjiacha coal mine had serious spontaneous combustion problem. Although the nitrogen injection and plugging air technology were taken to control the disaster, the effect was not obvious. To solve this problem, PFC2D was used to build a mining numerical model for dynamically tracking the change of fracture variation. The result shows that the air leakage channel will occur with the collapse of main roof in lower coal seam, which provides the basis for the monitoring work before the disaster and the application of the pressure equalization system. In order to prevent the invasion of harmful gases and avoid fresh air flowing into the fire area causing an explosion, a pressure balancing ventilation method was applied in the 30110 mining face. It can control the air pressure between upper fire area and lower working face in a safe range. The test safety pressure of 296 Pa and the normal safety adjustment interval (118 Pa, 166 Pa) were determined by calculation. Application results prove that the pressure balancing ventilation can effectively prevent the occurrence of harmful gas intrusion and ensure the safe mining of the mine. [ABSTRACT FROM AUTHOR]