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Research on "three zone" classification of spontaneous combustion and its numerical simulation in gob of mines under the sea 被引量:1
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作者 程卫民 郭艳培 +2 位作者 王刚 谢军 郑仰昕 《Journal of Coal Science & Engineering(China)》 2007年第3期281-285,共5页
According to the classification standard of spontaneous combustion "three zone" in gob and the analysis of aerodynamics and energy equation of relax loose coal body, the paper used the method of computer simulation ... According to the classification standard of spontaneous combustion "three zone" in gob and the analysis of aerodynamics and energy equation of relax loose coal body, the paper used the method of computer simulation analysis to get the air distribution. The paper also determined the three zone area of H2103 fully mechanized caving face in Beizao Mine. 展开更多
关键词 mines under the sea gob spontaneous combustion "three zone" SIMULATION
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Correlation methods of base-level cycle based on wavelet neural network
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作者 Xingke XU Changwei CHEN Jing SUN Qinglong MENG 《Global Geology》 2007年第1期25-28,共4页
The authors discussed the method of wavelet neural network (WNN) for correlation of base-level cycle. A new vectored method of well log data was proposed. Through the training with the known data set, the WNN can re... The authors discussed the method of wavelet neural network (WNN) for correlation of base-level cycle. A new vectored method of well log data was proposed. Through the training with the known data set, the WNN can remenber the cycle pattern characteristic of the well log curves. By the trained WNN to identify the cycle pattern in the vectored log data, the ocrrdation process among the well cycles was completed. The application indicates that it is highly efficient and reliable in base-level cycle correlation. 展开更多
关键词 wavelet neural network stratigraphic correlation base-level cycle VECTOR
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Revisiting Triassic stratigraphy of the Yanshan belt 被引量:2
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作者 WEI HongHong WU GuoLi DUAN Liang 《Science China Earth Sciences》 SCIE EI CAS CSCD 2015年第4期491-501,共11页
Age determinations of the Triassic lithostratigraphic units of the Yanshan belt were previously based on plant fossils and regional correlations of lithologies. The Liujiagou and Heshanggou Formations were assigned as... Age determinations of the Triassic lithostratigraphic units of the Yanshan belt were previously based on plant fossils and regional correlations of lithologies. The Liujiagou and Heshanggou Formations were assigned as the Lower Triassic, and the Ermaying Formation was regarded as the Middle Triassic. We carried out a geochronologic study of detrital zircon grains from the Triassic sandstone in the Xiabancheng and Yingzi basins in northern Hebei where the Triassic strata are exceptionally well preserved. The results show that the Liujiagou, Heshanggou, and Ermaying Formations are all Late Triassic in age. The ages of detrital zircons also revealed that the upper part of the Shihezi Formation and the overlying Sunjiagou Formation, both of which were thought to be the Middle-Late Permian units, are actually late Early to Middle Triassic deposits. This study combines the upper Shihezi and Sunjiagou Formations into a single unit termed as the Yingzi Formation. We also substitute the widely-used Liujiagou, Heshanggou, and Ermaying Formations with the Dingjiagou, Xiabancheng, and Huzhangzi Formations, respectively. Field observations and facies analysis show that the top of the Shihezi Formation is an erosive surface, marking a parallel unconformity between the Middle Permian and Lower Triassic. The Yingzi Formation is composed mainly of meandering river deposits, indicative of tectonic quiescence and low-relief landform in the Early to Middle Triassic. In contrast, the Dingjiagou, Xiabancheng, and Huzhangzi Formations are interpreted as the deposits of sandy/gravelly braided rivers, alluvial fans, fan deltas, and deep lakes in association with volcanism, thus indicating an intense rifting setting. A new Triassic lithostratigraphic division is proposed according to age constraints and facies analysis, and the results are of significance for understanding the early Mesozoic tectonic evolution of the Yanshan belt. 展开更多
关键词 Yanshan belt TRIASSIC detrital zircon LA-MC-ICPMS dating sedimentation
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