通过改进的自蔓延燃烧法合成制备高熵双钙钛矿SmBa(Mn_(0.2)Fe_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2))_(2)O_(5+δ)(HE-SBC)阴极材料,并复合10%(摩尔分数)Gd_(2)O_(3)掺杂CeO_(2)(GDC)以优化性能。结果表明:通过B位高熵的方法可以显著减小Co...通过改进的自蔓延燃烧法合成制备高熵双钙钛矿SmBa(Mn_(0.2)Fe_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2))_(2)O_(5+δ)(HE-SBC)阴极材料,并复合10%(摩尔分数)Gd_(2)O_(3)掺杂CeO_(2)(GDC)以优化性能。结果表明:通过B位高熵的方法可以显著减小Co离子由价态变化而引起的热膨胀,从而降低SmBaCo_(2)O_(5+δ)的热膨胀系数。在800℃,以氧化钇稳定氧化锆(YSZ)为电解质的HE-SBC对称电池的极化阻抗(R_(p))为1.04Ω·cm^(2),阳极支撑单电池的最高功率密度和R_(p)分别为683.53 m W/cm^(2)和0.46Ω·cm^(2)。进一步通过复合GDC(HE-SBC与GDC的质量比7:3)以增加三相界面提高HE-SBC的催化活性,在800℃HE-SBC-GDC复合阴极对称电池的极化阻抗仅为0.09Ω·cm^(2),且阳极支撑单电池的最高功率密度和R_(p)分别为838.66 m W/cm^(2)和0.12Ω·cm^(2)。展开更多
A new anthracene derivative 9,10-bis[3,5-di(4-tert-butylphenyl)phenyl]anthracene (BPPA) was synthesized via Suzuki coupling reaction and characterized by 1H NMR spectrum,mass spectrum,and elemental analysis.BPPA exhib...A new anthracene derivative 9,10-bis[3,5-di(4-tert-butylphenyl)phenyl]anthracene (BPPA) was synthesized via Suzuki coupling reaction and characterized by 1H NMR spectrum,mass spectrum,and elemental analysis.BPPA exhibits deep-blue emission both in solution and in solid thin film.This compound has a non-planar structure that results in high thermal stability and the phenomenon of polymorphism.The non-doped device based on this material shows stable deep-blue emission with the 1931 Commission international de I'Eclairage (CIE) coordinate of (0.15,0.05) under different applied voltages.The device exhibits the maximum external quantum efficiency of 2.2% at 14.9 mA/cm2 with luminance of 105 cd/m2.展开更多
Chronic obstructive pulmonary disease （COPD） is a complex disorder, characterized by an irreversible airflow limitation during breathing. This may lead to various extrapulmoanry comorbidities, such as cardiovascular...Chronic obstructive pulmonary disease （COPD） is a complex disorder, characterized by an irreversible airflow limitation during breathing. This may lead to various extrapulmoanry comorbidities, such as cardiovascular disease, osteoporosis, and diabetes mellitus （DM）. Type 2 （T2DM） accounts for a large proportion of DM, and is also showing a rising prevalence in developed and developing countries. In addition to the known factors for T2DM, several studies have demonstrated that COPD is also an important risk factor for T2DM. In this study, we aimed to determine the prevalence of COPD in patients with T2DM, and to analyze the clinical characteristics of COPD accompanied by T2DM.展开更多
文摘通过改进的自蔓延燃烧法合成制备高熵双钙钛矿SmBa(Mn_(0.2)Fe_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2))_(2)O_(5+δ)(HE-SBC)阴极材料,并复合10%(摩尔分数)Gd_(2)O_(3)掺杂CeO_(2)(GDC)以优化性能。结果表明:通过B位高熵的方法可以显著减小Co离子由价态变化而引起的热膨胀,从而降低SmBaCo_(2)O_(5+δ)的热膨胀系数。在800℃,以氧化钇稳定氧化锆(YSZ)为电解质的HE-SBC对称电池的极化阻抗(R_(p))为1.04Ω·cm^(2),阳极支撑单电池的最高功率密度和R_(p)分别为683.53 m W/cm^(2)和0.46Ω·cm^(2)。进一步通过复合GDC(HE-SBC与GDC的质量比7:3)以增加三相界面提高HE-SBC的催化活性,在800℃HE-SBC-GDC复合阴极对称电池的极化阻抗仅为0.09Ω·cm^(2),且阳极支撑单电池的最高功率密度和R_(p)分别为838.66 m W/cm^(2)和0.12Ω·cm^(2)。
基金supported by the National Natural Science Foundation of China (50773090,50825304,51033007)
文摘A new anthracene derivative 9,10-bis[3,5-di(4-tert-butylphenyl)phenyl]anthracene (BPPA) was synthesized via Suzuki coupling reaction and characterized by 1H NMR spectrum,mass spectrum,and elemental analysis.BPPA exhibits deep-blue emission both in solution and in solid thin film.This compound has a non-planar structure that results in high thermal stability and the phenomenon of polymorphism.The non-doped device based on this material shows stable deep-blue emission with the 1931 Commission international de I'Eclairage (CIE) coordinate of (0.15,0.05) under different applied voltages.The device exhibits the maximum external quantum efficiency of 2.2% at 14.9 mA/cm2 with luminance of 105 cd/m2.
文摘Chronic obstructive pulmonary disease （COPD） is a complex disorder, characterized by an irreversible airflow limitation during breathing. This may lead to various extrapulmoanry comorbidities, such as cardiovascular disease, osteoporosis, and diabetes mellitus （DM）. Type 2 （T2DM） accounts for a large proportion of DM, and is also showing a rising prevalence in developed and developing countries. In addition to the known factors for T2DM, several studies have demonstrated that COPD is also an important risk factor for T2DM. In this study, we aimed to determine the prevalence of COPD in patients with T2DM, and to analyze the clinical characteristics of COPD accompanied by T2DM.
