Based on the characteristics of the strong volatility of physical property in vertical direction, high gas content, high resource abundance and large exploitation potentiality of coal reservoir in Bide-Santang basin o...Based on the characteristics of the strong volatility of physical property in vertical direction, high gas content, high resource abundance and large exploitation potentiality of coal reservoir in Bide-Santang basin of Zhina coal field, we study the generation mechanism of interlayer interference, propagation rules of reservoir pressure drop and influencing factors of gas productivity in CBM multi-seam drainage in the paper. On the basis of the actual production data of X-2 well of Zhucang syncline in Bide-Santang basin,by simulating the gas production process of a CBM well under the condition of multiple seam with COMET3 numerical simulation software, we analyze the influencing factors of gas productivity during the process of multi-seam drainage, and illuminate the interlayer interference mechanism of multiseam drainage. The results show that permeability, reservoir pressure gradient, critical desorption pressure and fluid supply capacity of stratum have great influence on gas productivity of multi-seam drainage while coal thickness has little influence on it. Permeability, reservoir pressure gradient and fluid supply capacity of stratum affect the propagation velocity of reservoir pressure drop and thereby affect the final gas productivity. Moreover, the influence of critical desorption pressure on gas productivity of multiseam drainage is reflected in the gas breakthrough time and effective desorption area.展开更多
目的:探讨迟发型鸟氨酸氨甲酰转移酶缺乏症(OTCD)的临床特点、诊治经验,提高对该病的认识。方法:回顾性分析我院确诊的一对同卵双胞胎兄弟OTCD的临床诊疗经过和实验室结果,并结合国内外资料进行文献复习。结果:同胞弟弟,14岁4月,病程1年...目的:探讨迟发型鸟氨酸氨甲酰转移酶缺乏症(OTCD)的临床特点、诊治经验,提高对该病的认识。方法:回顾性分析我院确诊的一对同卵双胞胎兄弟OTCD的临床诊疗经过和实验室结果,并结合国内外资料进行文献复习。结果:同胞弟弟,14岁4月,病程1年余,1年前曾出现呕吐,此次仍以呕吐起病,后出现频繁抽搐、昏迷。血氨增高,尿气相色谱-质谱分析提示尿嘧啶和乳清酸增高。同胞哥哥,无明显临床表现,血氨正常,尿气相色谱-质谱分析提示尿嘧啶和乳清酸正常。遗传病医学外显子组基因测序明确其致病位点为鸟氨酸氨甲酰基转移酶(OTC)基因c.119G> A (p.Arg40His),患儿母亲携带c.119G> A(p.Arg40His)突变。结论:OTCD临床表现缺乏特异性,易误诊,对于原因不明的神经、精神症状或消化道症状患儿应尽早完善血氨、血尿质谱分析,从而有利于早期诊断,确诊则需要基因检测。治疗上以降低血氨,避免高氨血症对神经系统的损伤为原则,早期干预可改善预后。展开更多
目的探讨一次性吸痰器在儿童重症监护室(pediatric intensive care unit,PICU)患儿留取痰培养标本中的应用效果。方法选取2019年10月-2020年9月入住PICU首次留取痰培养标本的患儿作为研究对象。按照入住病区将其分为观察组302例和对照组...目的探讨一次性吸痰器在儿童重症监护室(pediatric intensive care unit,PICU)患儿留取痰培养标本中的应用效果。方法选取2019年10月-2020年9月入住PICU首次留取痰培养标本的患儿作为研究对象。按照入住病区将其分为观察组302例和对照组318例,观察组采取一次性吸痰器配合一次性吸痰管留取痰培养标本;对照组仅采用一次性吸痰管留取痰培养标本。比较2组痰培养标本质量、留取痰培养标本所需时间。结果观察组痰培养标本质量好于对照组(Z=-4.571,P<0.001),留取痰培养标本所需时间短于对照组(t=-32.600,P<0.001)。结论PICU患儿采取一次性吸痰器留取痰培养标本,可大大提高痰培养标本采集质量,缩短标本留取时间,节约人力,避免交叉感染。展开更多
基金supported by the National Major Special Project of Science and Technology of China (No.2011ZX05034)the Innovation Projects of University Graduates in Jiangsu Province (No.CXLX13_948)+1 种基金the National Natural Science Foundation of China (No.41272178)the Natural Science Foundation of Hunan Province (No.2016JJ4031)
文摘Based on the characteristics of the strong volatility of physical property in vertical direction, high gas content, high resource abundance and large exploitation potentiality of coal reservoir in Bide-Santang basin of Zhina coal field, we study the generation mechanism of interlayer interference, propagation rules of reservoir pressure drop and influencing factors of gas productivity in CBM multi-seam drainage in the paper. On the basis of the actual production data of X-2 well of Zhucang syncline in Bide-Santang basin,by simulating the gas production process of a CBM well under the condition of multiple seam with COMET3 numerical simulation software, we analyze the influencing factors of gas productivity during the process of multi-seam drainage, and illuminate the interlayer interference mechanism of multiseam drainage. The results show that permeability, reservoir pressure gradient, critical desorption pressure and fluid supply capacity of stratum have great influence on gas productivity of multi-seam drainage while coal thickness has little influence on it. Permeability, reservoir pressure gradient and fluid supply capacity of stratum affect the propagation velocity of reservoir pressure drop and thereby affect the final gas productivity. Moreover, the influence of critical desorption pressure on gas productivity of multiseam drainage is reflected in the gas breakthrough time and effective desorption area.
文摘目的:探讨迟发型鸟氨酸氨甲酰转移酶缺乏症(OTCD)的临床特点、诊治经验,提高对该病的认识。方法:回顾性分析我院确诊的一对同卵双胞胎兄弟OTCD的临床诊疗经过和实验室结果,并结合国内外资料进行文献复习。结果:同胞弟弟,14岁4月,病程1年余,1年前曾出现呕吐,此次仍以呕吐起病,后出现频繁抽搐、昏迷。血氨增高,尿气相色谱-质谱分析提示尿嘧啶和乳清酸增高。同胞哥哥,无明显临床表现,血氨正常,尿气相色谱-质谱分析提示尿嘧啶和乳清酸正常。遗传病医学外显子组基因测序明确其致病位点为鸟氨酸氨甲酰基转移酶(OTC)基因c.119G> A (p.Arg40His),患儿母亲携带c.119G> A(p.Arg40His)突变。结论:OTCD临床表现缺乏特异性,易误诊,对于原因不明的神经、精神症状或消化道症状患儿应尽早完善血氨、血尿质谱分析,从而有利于早期诊断,确诊则需要基因检测。治疗上以降低血氨,避免高氨血症对神经系统的损伤为原则,早期干预可改善预后。
文摘目的探讨一次性吸痰器在儿童重症监护室(pediatric intensive care unit,PICU)患儿留取痰培养标本中的应用效果。方法选取2019年10月-2020年9月入住PICU首次留取痰培养标本的患儿作为研究对象。按照入住病区将其分为观察组302例和对照组318例,观察组采取一次性吸痰器配合一次性吸痰管留取痰培养标本;对照组仅采用一次性吸痰管留取痰培养标本。比较2组痰培养标本质量、留取痰培养标本所需时间。结果观察组痰培养标本质量好于对照组(Z=-4.571,P<0.001),留取痰培养标本所需时间短于对照组(t=-32.600,P<0.001)。结论PICU患儿采取一次性吸痰器留取痰培养标本,可大大提高痰培养标本采集质量,缩短标本留取时间,节约人力,避免交叉感染。
