Results 81 to 90 of about 3,002 (128)

[Rare massive upper gastrointestinal bleeding: Three cases of Dieulafoy<b>'</b>s disease within diverticula of the descending duodenal and a literature review]. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Zhao Q, Zhang J, Zhou Q, He Z, Li H.
europepmc   +1 more source

[Endodontic retreatment of a maxillary second molar with chronic apical periodontitis and separated instrument: A case report]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Zang H, Liang Y.
europepmc   +1 more source

双阶自复位防屈曲支撑滞回性能参数分析

传统防屈曲支撑（BRB）小震下仅为结构提供刚度不提供阻尼，大震下易产生较大残余变形。为弥补BRB上述缺陷，本文提出一种新型双阶自复位防屈曲支撑（DY-SCBRB），小震下支撑提前屈服耗能，为结构提供附加阻尼，大震下支撑进一步耗能并为结构提供复位能力。通过对DY-SCBRB构造分析，得到支撑工作原理并建立支撑力-位移滞回关系恢复力模型，支撑双阶耗能特性和自复位能力得到有效验证；采用ABAQUS对DY-SCBRB进行静力加载，分析与验证新型支撑的滞回性能，找到支撑第一刚度比β1、第二刚度比β2 ...
刘吉胜, 孔涛, 孟丽岩, 潘雨桐, 王涛   +4 more
core  

[Donor leukemia relapse and conversion type after allogeneic hematopoietic stem cell transplantation: a case report]. [PDF]

Zhonghua Xue Ye Xue Za Zhi
Li RJ, Xiong M, Wang G, Cui Z, Zhu JL.
europepmc   +1 more source

[Comparison of effectiveness between endoscopic and microscopic anterior cervical discectomy and fusion]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Huang C, Chen K, Liu H, Ge Z, Lin D, Chen B, Su G, Lin Y, Hou Y, Li Y.   +9 more
europepmc   +1 more source

[Basic knowledge and skills required in external fixation and foot and ankle reconstruction]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Qin S, Du H.
europepmc   +1 more source

[Trends in burden of osteoporosis in China from 1990 to 2023 and analysis of epidemiological factors]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Wu Y, Lai Z, Yan H, Zhou B, Chen W, Zeng Z.   +5 more
europepmc   +1 more source

整段拼装式输电塔对接节点承载力试验研究

Jianzhu Gangjiegou Jinzhan
文中针对角钢铁塔，设计出一种上下两端完全分开、形成独立段的结构，各段间采用圆形座板式对接。该结构可减少主材接头处螺栓群的数量，既有利于优化现有施工组塔方式，提高组塔效率与施工安全性，也为机器人登塔作业提供便利条件。其中，对接节点是保障整塔稳定的关键部件，为明确其承载机制、破坏模式及极限承载力，文中开展了10个足尺节点抗拉承载力试验研究，考察了底板厚度、底板直径、孔位直径及螺栓孔径对节点荷载-位移曲线及承载力的影响。同时建立了合理的对接节点有限元模型，进一步研究了节点底板尺寸、螺孔尺寸 ...
陈锡祥, 张金锋, 罗义华, 张树林, 李涛, 张佳伦, 刘红军   +6 more
doaj  

[Attributable disease burden of low bone mineral density related fractures in people over 50 years old from 1990 to 2023 in China]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Lai Z, Wu Y, Jiang J, Shu X, Zeng Z, Chen W.   +5 more
europepmc   +1 more source

[Current status and Joinpoint regression analysis of the burden of musculoskeletal diseases in China from 1990 to 2023]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Hu Y, Hu L, Liu Q, Xiong Q, Li J, Yang C, Fu W.   +6 more
europepmc   +1 more source