To explore an effective method for reducing tar yield in biomass gasification,effects of petroleum coke on tar cracking during the gasification process of lees were examined.The influences of petroleum coke feeding mo...To explore an effective method for reducing tar yield in biomass gasification,effects of petroleum coke on tar cracking during the gasification process of lees were examined.The influences of petroleum coke feeding mode and particle size,water content in lees were tested in an electrically heated fixed bed tubular reactor at 700℃ under atmospheric pressure.Results show that the petroleum coke obviously affects the tar cracking in biomass gasification.Entering petroleum coke before lees into the reactor and using small petroleum coke particles are favorable for the tar cracking.The water content in lees also promotes the tar cracking and the yields of H2 and CO,however has little impact on the productions of CH4.The results are helpful to the research and development of the new co-gasification process of high water content biomass and petroleum coke.展开更多
采用低纯度的原料,通过电弧熔炼铜模铸造法制备了直径达10mm的Zr56.6Cu17.3Ni12.5Al9.6Ti4非晶合金圆棒。该合金玻璃转变温度tg=385.8℃,晶化温度tx=464.2℃,过冷液相区温差Δtx=78.4℃,约化玻璃温度trg(tg/tmL)=0.62。以基于DTA的合金...采用低纯度的原料,通过电弧熔炼铜模铸造法制备了直径达10mm的Zr56.6Cu17.3Ni12.5Al9.6Ti4非晶合金圆棒。该合金玻璃转变温度tg=385.8℃,晶化温度tx=464.2℃,过冷液相区温差Δtx=78.4℃,约化玻璃温度trg(tg/tmL)=0.62。以基于DTA的合金凝固点偏移的方法确定该合金的临界冷却速度Rc=7.1℃/s,低于商业合金Vit.105合金的临界冷速(约为10℃/s)。楔形试样对比结果显示:Zr56.6合金试样中的非晶组织区域明显大于Vit.105合金的,预示前者具有较好的实际玻璃形成能力。以上结果表明,Zr56.6Cu17.3Ni12.5Al9.6Ti4合金是Zr Al Ni Cu Ti系中玻璃形成能力最强的合金之一。展开更多
目的:检测双胎孕妇的甲状腺激素水平,分析其与双胎并发症的关系。方法:选取2016年6月—2017年1月南京医科大学附属妇产医院待产的136例双胎妊娠孕妇,分为双胎有并发症组(92例)和双胎无并发症组(44例),另选择同期正常单胎妊娠孕妇(50例)...目的:检测双胎孕妇的甲状腺激素水平,分析其与双胎并发症的关系。方法:选取2016年6月—2017年1月南京医科大学附属妇产医院待产的136例双胎妊娠孕妇,分为双胎有并发症组(92例)和双胎无并发症组(44例),另选择同期正常单胎妊娠孕妇(50例)做为对照(正常单胎组)。比较3组之间促甲状腺激素(TSH)、血清游离甲状腺素(FT4)水平的差异。采用受试者工作特征(ROC)曲线计算TSH预测双胎妊娠发生并发症的cut-off值。结果:双胎有并发症组TSH水平较双胎无并发症组和正常单胎组明显增高,差异有统计学意义(P<0.05);双胎无并发症组TSH水平与正常单胎组相比,差异无统计学意义(P>0.05);3组间FT4水平比较,差异均无统计学意义(P>0.05)。当TSH的cut-off值为5.18 m IU/L时,其预测双胎妊娠发生并发症的敏感度及特异度分别为63%、91%。结论:双胎妊娠有并发症孕妇血清TSH水平升高,检测TSH对双胎妊娠并发症的发生具有很高的预测价值。展开更多
文摘To explore an effective method for reducing tar yield in biomass gasification,effects of petroleum coke on tar cracking during the gasification process of lees were examined.The influences of petroleum coke feeding mode and particle size,water content in lees were tested in an electrically heated fixed bed tubular reactor at 700℃ under atmospheric pressure.Results show that the petroleum coke obviously affects the tar cracking in biomass gasification.Entering petroleum coke before lees into the reactor and using small petroleum coke particles are favorable for the tar cracking.The water content in lees also promotes the tar cracking and the yields of H2 and CO,however has little impact on the productions of CH4.The results are helpful to the research and development of the new co-gasification process of high water content biomass and petroleum coke.
文摘采用低纯度的原料,通过电弧熔炼铜模铸造法制备了直径达10mm的Zr56.6Cu17.3Ni12.5Al9.6Ti4非晶合金圆棒。该合金玻璃转变温度tg=385.8℃,晶化温度tx=464.2℃,过冷液相区温差Δtx=78.4℃,约化玻璃温度trg(tg/tmL)=0.62。以基于DTA的合金凝固点偏移的方法确定该合金的临界冷却速度Rc=7.1℃/s,低于商业合金Vit.105合金的临界冷速(约为10℃/s)。楔形试样对比结果显示:Zr56.6合金试样中的非晶组织区域明显大于Vit.105合金的,预示前者具有较好的实际玻璃形成能力。以上结果表明,Zr56.6Cu17.3Ni12.5Al9.6Ti4合金是Zr Al Ni Cu Ti系中玻璃形成能力最强的合金之一。
文摘目的:检测双胎孕妇的甲状腺激素水平,分析其与双胎并发症的关系。方法:选取2016年6月—2017年1月南京医科大学附属妇产医院待产的136例双胎妊娠孕妇,分为双胎有并发症组(92例)和双胎无并发症组(44例),另选择同期正常单胎妊娠孕妇(50例)做为对照(正常单胎组)。比较3组之间促甲状腺激素(TSH)、血清游离甲状腺素(FT4)水平的差异。采用受试者工作特征(ROC)曲线计算TSH预测双胎妊娠发生并发症的cut-off值。结果:双胎有并发症组TSH水平较双胎无并发症组和正常单胎组明显增高,差异有统计学意义(P<0.05);双胎无并发症组TSH水平与正常单胎组相比,差异无统计学意义(P>0.05);3组间FT4水平比较,差异均无统计学意义(P>0.05)。当TSH的cut-off值为5.18 m IU/L时,其预测双胎妊娠发生并发症的敏感度及特异度分别为63%、91%。结论:双胎妊娠有并发症孕妇血清TSH水平升高,检测TSH对双胎妊娠并发症的发生具有很高的预测价值。
