髋关节发育不良(developmental dysplasia of the hip,DDH)是指髋关节发育过程中出现的一系列结构畸形,其早期诊断与治疗对保障良好的关节功能至关重要。除了特征性的临床表现和体征外,影像学检查是诊断DDH的重要依据,其中骨盆X线片是成...髋关节发育不良(developmental dysplasia of the hip,DDH)是指髋关节发育过程中出现的一系列结构畸形,其早期诊断与治疗对保障良好的关节功能至关重要。除了特征性的临床表现和体征外,影像学检查是诊断DDH的重要依据,其中骨盆X线片是成人DDH分型的主要信息来源。临床常用的成人DDH分型方法主要有Eftekhar分型、Crowe分型、Keroul分型以及Hartofilakidis分型四种,各分型所侧重的股骨头与髋臼的对应关系存在着一定差异。DDH的治疗方案需根据患者出现症状的年龄以及关节畸形程度来决策。本文针对DDH的临床筛查手段、常用的成人DDH分型方法的异同以及DDH的相关治疗策略做一综述。展开更多
Nanocrystal of upconversion （UC） phosphor Ho^3＋, Tm^3＋ , and Yb^3＋ co-doped NaYF4 was prepared by the hydrothermal method in the presence of the complexing agent EDTA. Under 980 nm diode laser excitation, the imp...Nanocrystal of upconversion （UC） phosphor Ho^3＋, Tm^3＋ , and Yb^3＋ co-doped NaYF4 was prepared by the hydrothermal method in the presence of the complexing agent EDTA. Under 980 nm diode laser excitation, the impact of different concentrations of Ho^3＋ ion on the UC luminescence intensity was discussed. The law of luminescence intensity versus pump power shows that the 474 nm blue emission, 538 nm green emission, and 642 nm red emission are all due to the two-photon process, while the 450 nm blue emission is a three-photon process. The UC mechanism and processes were also analyzed. The sample was characterized by transmission electron microscopy （TEM） and X-ray diffraction （XRD）. The result shows that Ho^3＋ ,Tm^3＋ , and Yb^3＋ co-doped NaYF4 prepared by the hydrothermal method exhibits a hexagonal nanocrystal.展开更多
文摘髋关节发育不良(developmental dysplasia of the hip,DDH)是指髋关节发育过程中出现的一系列结构畸形,其早期诊断与治疗对保障良好的关节功能至关重要。除了特征性的临床表现和体征外,影像学检查是诊断DDH的重要依据,其中骨盆X线片是成人DDH分型的主要信息来源。临床常用的成人DDH分型方法主要有Eftekhar分型、Crowe分型、Keroul分型以及Hartofilakidis分型四种,各分型所侧重的股骨头与髋臼的对应关系存在着一定差异。DDH的治疗方案需根据患者出现症状的年龄以及关节畸形程度来决策。本文针对DDH的临床筛查手段、常用的成人DDH分型方法的异同以及DDH的相关治疗策略做一综述。
基金Project supported bythe Key Laboratory of Rare Earth Chemistry and Physics ,ChangchunInstitute of Applied Chemistry ,Chinese Academy of Sciences (R020202K)
文摘Nanocrystal of upconversion （UC） phosphor Ho^3＋, Tm^3＋ , and Yb^3＋ co-doped NaYF4 was prepared by the hydrothermal method in the presence of the complexing agent EDTA. Under 980 nm diode laser excitation, the impact of different concentrations of Ho^3＋ ion on the UC luminescence intensity was discussed. The law of luminescence intensity versus pump power shows that the 474 nm blue emission, 538 nm green emission, and 642 nm red emission are all due to the two-photon process, while the 450 nm blue emission is a three-photon process. The UC mechanism and processes were also analyzed. The sample was characterized by transmission electron microscopy （TEM） and X-ray diffraction （XRD）. The result shows that Ho^3＋ ,Tm^3＋ , and Yb^3＋ co-doped NaYF4 prepared by the hydrothermal method exhibits a hexagonal nanocrystal.
