Multifunctional ceramics of 0.825K_(0.5)Na_(0.5)NbO_(3)-0.175Sr(Yb_(0.5)Nb_(0.5))O_(3)-x%Er with ferroelectric,transparent and luminescent properties were obtained by doping Er.The effects of Er-doping on the structur...Multifunctional ceramics of 0.825K_(0.5)Na_(0.5)NbO_(3)-0.175Sr(Yb_(0.5)Nb_(0.5))O_(3)-x%Er with ferroelectric,transparent and luminescent properties were obtained by doping Er.The effects of Er-doping on the structure,luminescence and electrical properties of the ceramics were studied.After Er doping,the ceramics have luminescent properties and the luminescence intensity reaches the maximum when x=0.75.The ceramics still have good light transmission,but the transmittance decreases with the increase of Er-doping content due to the change of phase structure from pseudo-cubic phase to three-phase orthogonality.The energy storage properties is also greatly improved,and the W_(rec) and the η of the ceramics reach the maximum value of 0.31 J/cm^(3) and 94.6% when x=0.25,respectively.At the same time,the maximum electro-induced strain value is 0.031%.展开更多
剖宫产疤痕子宫内膜异位症是一种少见的医源性疾病,本研究旨在探讨其临床特征和预防方法.回顾分析本院2007年1月至2016年12月剖宫产疤痕子宫内膜异位症患者的临床资料,共有169例剖宫产疤痕子宫内膜异位症患者被纳入研究.患者平均年龄(32...剖宫产疤痕子宫内膜异位症是一种少见的医源性疾病,本研究旨在探讨其临床特征和预防方法.回顾分析本院2007年1月至2016年12月剖宫产疤痕子宫内膜异位症患者的临床资料,共有169例剖宫产疤痕子宫内膜异位症患者被纳入研究.患者平均年龄(32.0±3.9)岁,产次1~2次.潜伏期平均为(31.4±23.7)月,与患者年龄、产次等基本特征无明显相关性.80.5%的患者既往剖宫产为Pfannenstiel切口,19.5%的患者为正中纵形切口.统计学分析发现,Pfannenstiel切口发生子宫内膜异位症的潜伏期显著低于正中纵形切口(24.0 vs 36.0,P=0.005),并且多发性子宫内膜腺瘤患者潜伏期显著低于单个腺瘤患者(12.0 vs 24.0,P=0.034).子宫内膜腺瘤在剖宫产疤痕的两端更常见,在Pfannenstiel切口,83.4%的腺瘤位于两端;在正中纵形切口,84.8%的腺瘤位于两端.本研究提示剖宫产Pfannenstiel切口发生子宫内膜异位症的风险可能高于正中纵形切口,但仍需大样本前瞻性研究的验证.在剖宫产结束时彻底冲洗切口,尤其是脂肪层和筋膜层的两端对于预防剖宫产疤痕子宫内膜异位症十分重要.展开更多
Ho doping 0.825K_(0.5)Na_(0.5)NbO_(3)-0.175Sr(Yb_(0.5)Nb_(0.5))_(O3)(KNN-SYbN-x%Ho)transparent ceramics were prepared by solid-state sintering method.The structure,ferroelectric,energy storage,and optical properties o...Ho doping 0.825K_(0.5)Na_(0.5)NbO_(3)-0.175Sr(Yb_(0.5)Nb_(0.5))_(O3)(KNN-SYbN-x%Ho)transparent ceramics were prepared by solid-state sintering method.The structure,ferroelectric,energy storage,and optical properties of KNN-SYbN-x%Ho were explored.With the addition of Ho,under the excitation of a 980 nm laser,the ceramics exhibit up-conversion luminescence properties with wavelengths of 550 nm and 670 nm,however,the ceramics change from pseudo-cubic phase to triphase-orthorhombic phase and the light transmittance decreases.The addition of Ho significantly enhances the ferroelectric properties and the energy storage performance of KNN-SYbN-x%Ho ceramics.When x=0.15,the residual polarization P_(r)=9.11μC/cm^(2),while x=0.20,the maximum energy storage density W_(rec) reaches 0.26 J/cm^(3),and the energy storage efficiencyηreaches 87.1%.展开更多
基金Supported by the National Natural Science Foundation of China (No.61965007)Guangxi Natual Science Foundation (No.2018GXNSFDA281042)Guangxi Key Laboratory of Information Materials (No.201007-Z)。
文摘Multifunctional ceramics of 0.825K_(0.5)Na_(0.5)NbO_(3)-0.175Sr(Yb_(0.5)Nb_(0.5))O_(3)-x%Er with ferroelectric,transparent and luminescent properties were obtained by doping Er.The effects of Er-doping on the structure,luminescence and electrical properties of the ceramics were studied.After Er doping,the ceramics have luminescent properties and the luminescence intensity reaches the maximum when x=0.75.The ceramics still have good light transmission,but the transmittance decreases with the increase of Er-doping content due to the change of phase structure from pseudo-cubic phase to three-phase orthogonality.The energy storage properties is also greatly improved,and the W_(rec) and the η of the ceramics reach the maximum value of 0.31 J/cm^(3) and 94.6% when x=0.25,respectively.At the same time,the maximum electro-induced strain value is 0.031%.
文摘剖宫产疤痕子宫内膜异位症是一种少见的医源性疾病,本研究旨在探讨其临床特征和预防方法.回顾分析本院2007年1月至2016年12月剖宫产疤痕子宫内膜异位症患者的临床资料,共有169例剖宫产疤痕子宫内膜异位症患者被纳入研究.患者平均年龄(32.0±3.9)岁,产次1~2次.潜伏期平均为(31.4±23.7)月,与患者年龄、产次等基本特征无明显相关性.80.5%的患者既往剖宫产为Pfannenstiel切口,19.5%的患者为正中纵形切口.统计学分析发现,Pfannenstiel切口发生子宫内膜异位症的潜伏期显著低于正中纵形切口(24.0 vs 36.0,P=0.005),并且多发性子宫内膜腺瘤患者潜伏期显著低于单个腺瘤患者(12.0 vs 24.0,P=0.034).子宫内膜腺瘤在剖宫产疤痕的两端更常见,在Pfannenstiel切口,83.4%的腺瘤位于两端;在正中纵形切口,84.8%的腺瘤位于两端.本研究提示剖宫产Pfannenstiel切口发生子宫内膜异位症的风险可能高于正中纵形切口,但仍需大样本前瞻性研究的验证.在剖宫产结束时彻底冲洗切口,尤其是脂肪层和筋膜层的两端对于预防剖宫产疤痕子宫内膜异位症十分重要.
基金Funded by the National Nature Science Foundation of China(No.61965007)the Guangxi Nature Science Foundation,China(No.2018GXNSFDA281042)the Guangxi Key Laboratory of Information Materials(Guilin University of Electronic Technology),China(No.201007-Z)。
文摘Ho doping 0.825K_(0.5)Na_(0.5)NbO_(3)-0.175Sr(Yb_(0.5)Nb_(0.5))_(O3)(KNN-SYbN-x%Ho)transparent ceramics were prepared by solid-state sintering method.The structure,ferroelectric,energy storage,and optical properties of KNN-SYbN-x%Ho were explored.With the addition of Ho,under the excitation of a 980 nm laser,the ceramics exhibit up-conversion luminescence properties with wavelengths of 550 nm and 670 nm,however,the ceramics change from pseudo-cubic phase to triphase-orthorhombic phase and the light transmittance decreases.The addition of Ho significantly enhances the ferroelectric properties and the energy storage performance of KNN-SYbN-x%Ho ceramics.When x=0.15,the residual polarization P_(r)=9.11μC/cm^(2),while x=0.20,the maximum energy storage density W_(rec) reaches 0.26 J/cm^(3),and the energy storage efficiencyηreaches 87.1%.
