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[Analysis of disease burden of fall-related fractures among elderly Chinese from 1990 to 2023]. [PDF]

open access: yesZhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Zhou Y   +5 more
europepmc   +1 more source

[Association between wearable-derived physical activity patterns and gut microbiota in older adults]. [PDF]

open access: yesBeijing Da Xue Xue Bao Yi Xue Ban
Gao J   +9 more
europepmc   +1 more source

半导体激光器老化夹具

open access: yes
本发明提供一种适用于半导体激光器的老化夹具,其中包括:一主体,该主体为一印刷电路板,在该主体的中间开有一凹槽,该主体中间的凹槽是方形、条形或T字形,该主体上面的凹槽的两侧开有螺孔,该螺孔与盖板上的圆孔对应;一带有激光器的热沉,该热沉位于该凹槽内;其中还包括一盖板,该盖板用于封盖住该热沉,该盖板上面的两侧开有圆孔 ...
刘宇   +4 more
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