利用传统固相烧结法制备了0.02Pb(Sb_(0.5)Nb_(0.5))O_3-0.98Pb_(1-2 x)Ba_xSr_x(Zr_(0.53)Ti_(0.47))O_3压电陶瓷(其中x=0.02,0.03,0.04,0.05).讨论了不同Ba、Sr复合掺杂量及烧结温度对陶瓷结构和电性能的影响.结果显示,当x=0.04,烧结...利用传统固相烧结法制备了0.02Pb(Sb_(0.5)Nb_(0.5))O_3-0.98Pb_(1-2 x)Ba_xSr_x(Zr_(0.53)Ti_(0.47))O_3压电陶瓷(其中x=0.02,0.03,0.04,0.05).讨论了不同Ba、Sr复合掺杂量及烧结温度对陶瓷结构和电性能的影响.结果显示,当x=0.04,烧结温度为1 260℃时,压电陶瓷的性能最佳,其中d_(33)=615 p C/N,ε_(33)/ε_0=2 224,tanδ=2.11%;然后把这个配方的陶瓷片安装到传感器中,测试其电荷灵敏度、最大横向灵敏度比和最大线性误差,电荷灵敏度为2.72 p C/(m·s^(-2)),最大横向灵敏度比小于5%,最大线性误差为2.97%,符合通用振动测试类型传感器使用要求.展开更多
目的探究自血穴注疗法联合卡介苗多糖核酸治疗小儿支气管哮喘的临床疗效。方法选取庆阳市妇幼保健医院2020年1月—2022年1月收治的120例支气管哮喘患儿为研究对象,随机将其分为联合组和传统组各60例,给予传统组卡介苗多糖核酸治疗,联合...目的探究自血穴注疗法联合卡介苗多糖核酸治疗小儿支气管哮喘的临床疗效。方法选取庆阳市妇幼保健医院2020年1月—2022年1月收治的120例支气管哮喘患儿为研究对象,随机将其分为联合组和传统组各60例,给予传统组卡介苗多糖核酸治疗,联合组在传统组的基础上采用自血穴注疗法治疗,比较临床疗效,肺功能改善情况,日间症状积分,夜间症状积分以及生活质量积分变化,免疫功能相关指标水平变化及不良反应发生情况。结果联合组总有效率高于传统组(P<0.05);治疗后4周两组患儿第1秒用力呼气容积(forced expiratory volume in the first second,FEV1)、用力呼气流量(forced expiratory flow,FEF)水平均显著升高,且联合组显著高于传统组(P<0.05);日间症状积分和夜间症状积分均降低,生活质量积分升高,联合组显著优于传统组(P<0.05);治疗后CD_(3)^(+)、CD_(4)^(+)、CD_(4)^(+)/CD_(8)^(+)水平均显著升高,且联合组显著高于传统组(P<0.05);两组均未发生不良反应。结论自血穴注疗法联合卡介苗多糖核酸治疗小儿支气管哮喘安全高效,可广泛应用于临床。展开更多
Fine-grained 01420 Al-Li alloy sheets were produced by thermo-mechanical processing based on the mechanism of particle stimulated nucleation of recrystallization.The thermo-mechanically processed sheets were observed ...Fine-grained 01420 Al-Li alloy sheets were produced by thermo-mechanical processing based on the mechanism of particle stimulated nucleation of recrystallization.The thermo-mechanically processed sheets were observed to contain layers of different microstructures along the thickness.The precipitate behavior of the second phase particles and their effects on the distribution of dislocations and layered recrystallized grain structure were analyzed by optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM) and X-ray diffractometry(XRD).The formation mechanism of the gradient particles was discussed.The results show that after aging,a gradient distribution of large particles along the thickness is observed,the particles in the surface layer(SL) are distributed homogeneously,whereas those in the center layer(CL) are mainly distributed parallel to the rolling direction,and the volume fraction of the particles in the SL is higher than that in the CL.Subsequent rolling in the presence of layer-distributed particles results in a corresponding homogeneous distribution of highly strained regions in the SL and a banded distribution of them in CL,which is the main reason for the formation of layered grain structure along the thickness in the sheets.展开更多
文摘利用传统固相烧结法制备了0.02Pb(Sb_(0.5)Nb_(0.5))O_3-0.98Pb_(1-2 x)Ba_xSr_x(Zr_(0.53)Ti_(0.47))O_3压电陶瓷(其中x=0.02,0.03,0.04,0.05).讨论了不同Ba、Sr复合掺杂量及烧结温度对陶瓷结构和电性能的影响.结果显示,当x=0.04,烧结温度为1 260℃时,压电陶瓷的性能最佳,其中d_(33)=615 p C/N,ε_(33)/ε_0=2 224,tanδ=2.11%;然后把这个配方的陶瓷片安装到传感器中,测试其电荷灵敏度、最大横向灵敏度比和最大线性误差,电荷灵敏度为2.72 p C/(m·s^(-2)),最大横向灵敏度比小于5%,最大线性误差为2.97%,符合通用振动测试类型传感器使用要求.
文摘目的探究自血穴注疗法联合卡介苗多糖核酸治疗小儿支气管哮喘的临床疗效。方法选取庆阳市妇幼保健医院2020年1月—2022年1月收治的120例支气管哮喘患儿为研究对象,随机将其分为联合组和传统组各60例,给予传统组卡介苗多糖核酸治疗,联合组在传统组的基础上采用自血穴注疗法治疗,比较临床疗效,肺功能改善情况,日间症状积分,夜间症状积分以及生活质量积分变化,免疫功能相关指标水平变化及不良反应发生情况。结果联合组总有效率高于传统组(P<0.05);治疗后4周两组患儿第1秒用力呼气容积(forced expiratory volume in the first second,FEV1)、用力呼气流量(forced expiratory flow,FEF)水平均显著升高,且联合组显著高于传统组(P<0.05);日间症状积分和夜间症状积分均降低,生活质量积分升高,联合组显著优于传统组(P<0.05);治疗后CD_(3)^(+)、CD_(4)^(+)、CD_(4)^(+)/CD_(8)^(+)水平均显著升高,且联合组显著高于传统组(P<0.05);两组均未发生不良反应。结论自血穴注疗法联合卡介苗多糖核酸治疗小儿支气管哮喘安全高效,可广泛应用于临床。
基金Project(2006DFA53250) supported by the International Science and Technology Cooperation Program of ChinaProject(2005CB623706) supported by the Major State Basic Research Development Program of China
文摘Fine-grained 01420 Al-Li alloy sheets were produced by thermo-mechanical processing based on the mechanism of particle stimulated nucleation of recrystallization.The thermo-mechanically processed sheets were observed to contain layers of different microstructures along the thickness.The precipitate behavior of the second phase particles and their effects on the distribution of dislocations and layered recrystallized grain structure were analyzed by optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM) and X-ray diffractometry(XRD).The formation mechanism of the gradient particles was discussed.The results show that after aging,a gradient distribution of large particles along the thickness is observed,the particles in the surface layer(SL) are distributed homogeneously,whereas those in the center layer(CL) are mainly distributed parallel to the rolling direction,and the volume fraction of the particles in the SL is higher than that in the CL.Subsequent rolling in the presence of layer-distributed particles results in a corresponding homogeneous distribution of highly strained regions in the SL and a banded distribution of them in CL,which is the main reason for the formation of layered grain structure along the thickness in the sheets.
