目的分析肥厚型葡萄酒色斑(Port-wine stains,PWS)的影像学和病理学特点,以期为改善该病的治疗效果提供依据。方法对32例接受过激光治疗的肥厚型PWS患者的面部MRI资料进行分析,对其增厚程度和血管畸形程度进行评价分级;对其中18例患者...目的分析肥厚型葡萄酒色斑(Port-wine stains,PWS)的影像学和病理学特点,以期为改善该病的治疗效果提供依据。方法对32例接受过激光治疗的肥厚型PWS患者的面部MRI资料进行分析,对其增厚程度和血管畸形程度进行评价分级;对其中18例患者进行组织学检查,并与15例平坦型患者进行对比分析,探讨两种类型的血管组织学结构差异。结果 MRI资料的相关性分析证实,软组织厚度随畸形血管分布增多而增加(P<0.001)。组织学显示,肥厚型相较于平坦型PWS患者,其面部脂肪层和肌肉层的血管口径更大(0.048 mm vs 0.020 mm,P=0.004;0.035 mm vs 0.017 mm,P=0.008),并且管壁更厚(0.014 mm vs 0.006 mm,P=0.003;0.010 mm vs 0.006 mm,P=0.020)。结论肥厚型PWS患者激光疗效较差,与患者深部畸形血管明显超出现有激光对血管热凝固的破坏深度相关。展开更多
Based on the particularities of gas outbursts,i.e.,low gas bearing capacity and low gas pressure in the "Three Soft" coal seam in western Henan,we applied the theories of plate tectonics and regional structu...Based on the particularities of gas outbursts,i.e.,low gas bearing capacity and low gas pressure in the "Three Soft" coal seam in western Henan,we applied the theories of plate tectonics and regional structural evolution to investigate the mechanism of this seam and its impact on the coal seam gas formation.Our investigation revealed that coal and gas outbursts are distributed in a strip in a NW direction,with a number of high-penetration mines scattered towards the south side and low-gas mines largely located on the north side.We analyzed the statistics of 38 gas explosions and the rock-coal sturdiness number coefficient f of 167 sampling sites in the region and found the gas outburst mechanism that features a "low indicator outburst phenomenon".The mechanism is characterized by structural coal as its core,a low gas bearing capacity,low gas pressure and sturdiness coefficient f mostly less than 0.3.Our research results provide a theoretical foundation for effective control of gas disasters.展开更多
To gain an understanding of gas occurrence, distribution is the fundamental basis for preventing gas disasters. Presently, how tectonic structures control gas occurrence remains problematic. This study proposes the th...To gain an understanding of gas occurrence, distribution is the fundamental basis for preventing gas disasters. Presently, how tectonic structures control gas occurrence remains problematic. This study proposes the theory and elucidates the mechanism of stepwise tectonic control on gas occurrence according to the characteristics of gas occurrence and the patterns of gas distribution in coal mines in North China. On the one hand, tectonic compression and shearing lead to stress concentration and thus deform the coal and reduce the coal seam permeability, further contributing to gas preservation. On the other hand, tectonic extension and rifting lead to stress release and thus improve the coal seam permeability, further contributing to gas emission. Therefore, the distribution zones of tectonic compression, ubiquitous coal deformation, and gas accumulation have been step-wisely revealed, and the coal-gas outburst proneness zones are finally identified. The proposed theory of step-wise tectonic control on gas occurrence is of practical significance for gas prediction and control.展开更多
文摘目的分析肥厚型葡萄酒色斑(Port-wine stains,PWS)的影像学和病理学特点,以期为改善该病的治疗效果提供依据。方法对32例接受过激光治疗的肥厚型PWS患者的面部MRI资料进行分析,对其增厚程度和血管畸形程度进行评价分级;对其中18例患者进行组织学检查,并与15例平坦型患者进行对比分析,探讨两种类型的血管组织学结构差异。结果 MRI资料的相关性分析证实,软组织厚度随畸形血管分布增多而增加(P<0.001)。组织学显示,肥厚型相较于平坦型PWS患者,其面部脂肪层和肌肉层的血管口径更大(0.048 mm vs 0.020 mm,P=0.004;0.035 mm vs 0.017 mm,P=0.008),并且管壁更厚(0.014 mm vs 0.006 mm,P=0.003;0.010 mm vs 0.006 mm,P=0.020)。结论肥厚型PWS患者激光疗效较差,与患者深部畸形血管明显超出现有激光对血管热凝固的破坏深度相关。
基金support for this work,provided by the National Natural Science Foundation of China (No.50834005)
文摘Based on the particularities of gas outbursts,i.e.,low gas bearing capacity and low gas pressure in the "Three Soft" coal seam in western Henan,we applied the theories of plate tectonics and regional structural evolution to investigate the mechanism of this seam and its impact on the coal seam gas formation.Our investigation revealed that coal and gas outbursts are distributed in a strip in a NW direction,with a number of high-penetration mines scattered towards the south side and low-gas mines largely located on the north side.We analyzed the statistics of 38 gas explosions and the rock-coal sturdiness number coefficient f of 167 sampling sites in the region and found the gas outburst mechanism that features a "low indicator outburst phenomenon".The mechanism is characterized by structural coal as its core,a low gas bearing capacity,low gas pressure and sturdiness coefficient f mostly less than 0.3.Our research results provide a theoretical foundation for effective control of gas disasters.
基金financially supported by the Major Project of National Science and Technology of China(No.2011ZX05040-005)the Key Program of National Natural Science Foundation of China(No.51234005)+1 种基金the National Natural Science Foundation of China(No.41102094)the Changjiang Scholars and Innovative Research Team in University of China(No.IRT1235)
文摘To gain an understanding of gas occurrence, distribution is the fundamental basis for preventing gas disasters. Presently, how tectonic structures control gas occurrence remains problematic. This study proposes the theory and elucidates the mechanism of stepwise tectonic control on gas occurrence according to the characteristics of gas occurrence and the patterns of gas distribution in coal mines in North China. On the one hand, tectonic compression and shearing lead to stress concentration and thus deform the coal and reduce the coal seam permeability, further contributing to gas preservation. On the other hand, tectonic extension and rifting lead to stress release and thus improve the coal seam permeability, further contributing to gas emission. Therefore, the distribution zones of tectonic compression, ubiquitous coal deformation, and gas accumulation have been step-wisely revealed, and the coal-gas outburst proneness zones are finally identified. The proposed theory of step-wise tectonic control on gas occurrence is of practical significance for gas prediction and control.
