The experimental result of the collection efficiency of the axial flow cyclone with the fixed guide vanes is lower than that with the tangential inlet pipe to the cyclone body due to the weak angular momentum transfer...The experimental result of the collection efficiency of the axial flow cyclone with the fixed guide vanes is lower than that with the tangential inlet pipe to the cyclone body due to the weak angular momentum transfer given by flowing through the guide vanes. However, one of the interesting points is the control of the collection efficiency depended on the funnel shaped exit pipes. The collection efficiencies for these funnel shaped exit pipes are depended on the Froude number. Then, in this paper, the experimental results of the pressure drop and also the collection efficiency using the fly-ash particles and also the comparison of the calculated results of the collection efficiency with the experimental results are described i~ detail.展开更多
目的研究基于反向散射的定量超声生物标记物在妊娠妇女宫颈微结构变化中的诊断价值。方法选取2020年7—12月在阳江市第三人民医院产检的孕妇40例,将其分为两组,早产组20例妇女在孕早期(妊娠5~14周)即终止妊娠;足月组中20例在孕晚期(37~4...目的研究基于反向散射的定量超声生物标记物在妊娠妇女宫颈微结构变化中的诊断价值。方法选取2020年7—12月在阳江市第三人民医院产检的孕妇40例,将其分为两组,早产组20例妇女在孕早期(妊娠5~14周)即终止妊娠;足月组中20例在孕晚期(37~41周)足月引产。均接受了超声检查,统计分析两组孕妇的衰减系数(attenuation coefficient,SAC)和平均背向散射功率差(average backscattering power difference,mBSPD),并分析早产组孕妇的漏斗形成情况。结果早产组孕妇20例中,在漏斗形状方面,U型、V型、Y型、T型分别占40.00%、30.00%、20.00%、10.00%。早产组孕妇的SAC和mBSPD均低于足月组,差异有统计学意义(P<0.05)。结论基于反向散射的定量超声生物标记物在妊娠妇女宫颈微结构变化中的诊断价值较高。展开更多
The effects of funnel-shape internals on hydrodynamics and mass transfer in an internal loop three-phase fluidized bed were investigated.Three different kinds of internals were designed which were setup on the top of ...The effects of funnel-shape internals on hydrodynamics and mass transfer in an internal loop three-phase fluidized bed were investigated.Three different kinds of internals were designed which were setup on the top of draft-tube in terms of horizontal angle and outer diameter, and gas hold up, liquid mixing time, liquid circulation velocity and mass transfer coefficient were measured respectively.It was shown that the riser gas holdup and mass transfer coefficient increased by 10% and 15% than that without such an internal, liquid mixing time decreased by 10% to 25%.When the superficial gas velocity was less than 0.5 cm·s-1, liquid circulation velocity increased with the setup of such internals·Liquid circulation velocity decreased when the superficial gas velocity was above 0.5 cm·s-1.In addition, the variation of structural parameters of funnel-shape internals had significant effects on hydrodynamics and mass transfer.展开更多
ZnO nano-tubes could be synthesized with ZnCl2 and Na2CO3 as raw materials and twelve alkyl Na2SO4 as template under suitable conditions. XRD, TEM and TGA results indicate that the tube is composed of many funnel-shap...ZnO nano-tubes could be synthesized with ZnCl2 and Na2CO3 as raw materials and twelve alkyl Na2SO4 as template under suitable conditions. XRD, TEM and TGA results indicate that the tube is composed of many funnel-shaped cavities connecting with each other like bamboo. The outer diameter of the tube is about 65 nm and the inner diameter is about 35 nm. Every cavity is about 50 nm in length.展开更多
文摘The experimental result of the collection efficiency of the axial flow cyclone with the fixed guide vanes is lower than that with the tangential inlet pipe to the cyclone body due to the weak angular momentum transfer given by flowing through the guide vanes. However, one of the interesting points is the control of the collection efficiency depended on the funnel shaped exit pipes. The collection efficiencies for these funnel shaped exit pipes are depended on the Froude number. Then, in this paper, the experimental results of the pressure drop and also the collection efficiency using the fly-ash particles and also the comparison of the calculated results of the collection efficiency with the experimental results are described i~ detail.
文摘目的研究基于反向散射的定量超声生物标记物在妊娠妇女宫颈微结构变化中的诊断价值。方法选取2020年7—12月在阳江市第三人民医院产检的孕妇40例,将其分为两组,早产组20例妇女在孕早期(妊娠5~14周)即终止妊娠;足月组中20例在孕晚期(37~41周)足月引产。均接受了超声检查,统计分析两组孕妇的衰减系数(attenuation coefficient,SAC)和平均背向散射功率差(average backscattering power difference,mBSPD),并分析早产组孕妇的漏斗形成情况。结果早产组孕妇20例中,在漏斗形状方面,U型、V型、Y型、T型分别占40.00%、30.00%、20.00%、10.00%。早产组孕妇的SAC和mBSPD均低于足月组,差异有统计学意义(P<0.05)。结论基于反向散射的定量超声生物标记物在妊娠妇女宫颈微结构变化中的诊断价值较高。
文摘The effects of funnel-shape internals on hydrodynamics and mass transfer in an internal loop three-phase fluidized bed were investigated.Three different kinds of internals were designed which were setup on the top of draft-tube in terms of horizontal angle and outer diameter, and gas hold up, liquid mixing time, liquid circulation velocity and mass transfer coefficient were measured respectively.It was shown that the riser gas holdup and mass transfer coefficient increased by 10% and 15% than that without such an internal, liquid mixing time decreased by 10% to 25%.When the superficial gas velocity was less than 0.5 cm·s-1, liquid circulation velocity increased with the setup of such internals·Liquid circulation velocity decreased when the superficial gas velocity was above 0.5 cm·s-1.In addition, the variation of structural parameters of funnel-shape internals had significant effects on hydrodynamics and mass transfer.
文摘ZnO nano-tubes could be synthesized with ZnCl2 and Na2CO3 as raw materials and twelve alkyl Na2SO4 as template under suitable conditions. XRD, TEM and TGA results indicate that the tube is composed of many funnel-shaped cavities connecting with each other like bamboo. The outer diameter of the tube is about 65 nm and the inner diameter is about 35 nm. Every cavity is about 50 nm in length.
