The effect of magma intrusion on gas outburst is illustrated by a case study of the exposed magma intru- sion in the 313 mining area, upper coal seam Number 3, in the Qiwu Mine located in Shandong province. Vitrinite ...The effect of magma intrusion on gas outburst is illustrated by a case study of the exposed magma intru- sion in the 313 mining area, upper coal seam Number 3, in the Qiwu Mine located in Shandong province. Vitrinite reflectance, mercury injection, and maceral statistical analysis are used to characterize the coal. The aspects of coal metamorphism include changes in micro-components as well as in coal structure, the formation of new substances, and changes in gas absorption and storage. The results show that vitrinite reflectance increases within the region influenced by magma intrusion. The metamorphosed region may be divided into a weakly affected belt, a medium affected belt, a strongly affected belt, and a completely affected belt. Compared to the unaffected coal the total pore volume, as well as the amount of big and middle sized holes, increases while the number of transition holes and micro-pores decreases. This diminishes the absorption capacity of the matrix but enlarges the total gas storage space. Vitrinite con- tent initially decreases slightly but then increases rapidly while the inertinite content increases at first but then decreases. Exinite content decreases, then increases, and finally drops to zero. Higher vitrinite, and a lower inertinite, content increase gas absorption ability. This balances reduced adsorption caused by changes to pore structure. Consequently, gas adsorption capacity is not substantially reduced as the coal rank increases. Thermal metamorphism of the coal produces CH4 and other hydrocarbons that increase the total gas content in the coal seam. Asphaltene migrates into the medium and weakly affected regions filling in the pores and fractures there. This plugs the pathway for gas transport. A barrier is formed that hinders gas flow. C02, H2S, N2, and other gases carried in by the magma react to produce C02, which increases in relative concentration and enhances the risk of gas outburst. The two barriers, magma intrusion on one side and the medium and weakly affected belts on the other, as well as the unaf- fected coal seam itself, trap a large amount of gas during the thermal activity. This is the basic reason for gas outburst. These conclusions can enlighten activities related to gas prevention and control in a low rank coal mine affected by ma^ma intrusion.展开更多
A kind of novel pitch-based activated carbon microsphere（ACM） characterized by its controlled porous structure was developed in this study,the curative effect of this ACM on diabetes mellitus in rats was investigate...A kind of novel pitch-based activated carbon microsphere（ACM） characterized by its controlled porous structure was developed in this study,the curative effect of this ACM on diabetes mellitus in rats was investigated.ACM 0.2-0.3 mm in diameter was prepared by modified method.The optimal ACM was screened by its adsorption ability for glucose.Diabetes mellitus model was established by streptozotocin injection in male Sprague-Dawley rats.Two groups of rats were orally administrated with ACM twice a day for 30 d.Intestinal glucose transport was determined in vitro using everted rat intestinal sacs technique.Compared with the diabetic mellitus group,the ACM treated group showed significant lower blood glucose level and improved glucose tolerance after two-week treatment.If ACM was applied in the mucosal side,glucose permeation clearance in the ACM treated group was significantly higher than that of the control group,especially at high glucose concentration（10 mg/mL） on the serosal side.The selected ACM possessed a BET specific surface of 1566 m^2/g and high volume of micropores（0.478 cm^3/g） with fine spherical morphology,and showed more significant adsorption capacity for glucose.As oral microsphere preparations,ACM presented the curative effect on streptozotocin-induced diabetes mellitus in rats.展开更多
基金jointly supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)the National Basic Research Program of China (No. 2009CB219605)the National Natural Science Foundation of China (No. 41072117)
文摘The effect of magma intrusion on gas outburst is illustrated by a case study of the exposed magma intru- sion in the 313 mining area, upper coal seam Number 3, in the Qiwu Mine located in Shandong province. Vitrinite reflectance, mercury injection, and maceral statistical analysis are used to characterize the coal. The aspects of coal metamorphism include changes in micro-components as well as in coal structure, the formation of new substances, and changes in gas absorption and storage. The results show that vitrinite reflectance increases within the region influenced by magma intrusion. The metamorphosed region may be divided into a weakly affected belt, a medium affected belt, a strongly affected belt, and a completely affected belt. Compared to the unaffected coal the total pore volume, as well as the amount of big and middle sized holes, increases while the number of transition holes and micro-pores decreases. This diminishes the absorption capacity of the matrix but enlarges the total gas storage space. Vitrinite con- tent initially decreases slightly but then increases rapidly while the inertinite content increases at first but then decreases. Exinite content decreases, then increases, and finally drops to zero. Higher vitrinite, and a lower inertinite, content increase gas absorption ability. This balances reduced adsorption caused by changes to pore structure. Consequently, gas adsorption capacity is not substantially reduced as the coal rank increases. Thermal metamorphism of the coal produces CH4 and other hydrocarbons that increase the total gas content in the coal seam. Asphaltene migrates into the medium and weakly affected regions filling in the pores and fractures there. This plugs the pathway for gas transport. A barrier is formed that hinders gas flow. C02, H2S, N2, and other gases carried in by the magma react to produce C02, which increases in relative concentration and enhances the risk of gas outburst. The two barriers, magma intrusion on one side and the medium and weakly affected belts on the other, as well as the unaf- fected coal seam itself, trap a large amount of gas during the thermal activity. This is the basic reason for gas outburst. These conclusions can enlighten activities related to gas prevention and control in a low rank coal mine affected by ma^ma intrusion.
基金The Ministry of Science and Technology of the People’s Republic of China (Contract No. 2010DFA44300)Shanghai Committee of Science and Technology (Grant No.10DZ2220500 and 11DZ2260600)
文摘A kind of novel pitch-based activated carbon microsphere（ACM） characterized by its controlled porous structure was developed in this study,the curative effect of this ACM on diabetes mellitus in rats was investigated.ACM 0.2-0.3 mm in diameter was prepared by modified method.The optimal ACM was screened by its adsorption ability for glucose.Diabetes mellitus model was established by streptozotocin injection in male Sprague-Dawley rats.Two groups of rats were orally administrated with ACM twice a day for 30 d.Intestinal glucose transport was determined in vitro using everted rat intestinal sacs technique.Compared with the diabetic mellitus group,the ACM treated group showed significant lower blood glucose level and improved glucose tolerance after two-week treatment.If ACM was applied in the mucosal side,glucose permeation clearance in the ACM treated group was significantly higher than that of the control group,especially at high glucose concentration（10 mg/mL） on the serosal side.The selected ACM possessed a BET specific surface of 1566 m^2/g and high volume of micropores（0.478 cm^3/g） with fine spherical morphology,and showed more significant adsorption capacity for glucose.As oral microsphere preparations,ACM presented the curative effect on streptozotocin-induced diabetes mellitus in rats.
