Results 81 to 90 of about 307 (102)

220 kV复合绝缘子伞裙脱落断裂故障原因分析

Dianci bileiqi
针对某220 kV线路新投运复合绝缘子伞裙脱落断裂、硅橡胶材质分界缝隙与色泽分层问题，本文选取故障与正常样品，在常规断裂拉伸、热失重、扫描电镜等检测基础上，结合TGA-DSC联测、工业CT扫描、纳米压痕等新技术，开展了材料力学性能、材料组分与交联密度、微观形貌等方面的对比分析。力学性能分析表明，断裂伞裙拉伸强度、拉断伸长率不满足标准要求，硅橡胶分布、局部力学强度均匀性差；工业CT扫描发现芯棒内部、芯棒-护套处存在较多气隙，为出厂缺陷；热失重分析发现断裂部位PDMS含量显著下降且不均匀，属工艺不良问题 ...
高超, 张立雄, 毛磊, 张军广, 李黎, 罗康, 王大森   +6 more
doaj  

Effect of ceramic type and thickness on the masking ability of chairside machinable all-ceramic crowns. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Li S, Zhang L, Liang S, Liu Y, Xing W.
europepmc   +1 more source

[Research advance of solid-phase microextraction based on covalent organic framework materials]. [PDF]

Se Pu
Cheng YC, Gao YY, Li XM, Chen LY, DU F, Guo J, Meng YT, Sun M, Feng JJ.   +8 more
europepmc   +1 more source

Multi-stage 3D-printed guide for precise restoration of severely inclined teeth based on target restorative space guidance: a case report. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Yang L, Chen Z, Zhao J, Wang Y, Zhang J, Han X.   +5 more
europepmc   +1 more source

[Clinical efficacy of demineralized dentin matrix particles in immediate implantation for bone defects in posterior region: a 1 to 5-year follow-up study]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Wu H, Cao N, Cao L, Yu F, Zhang X, Wei S, Wei H, Guo S.   +7 more
europepmc   +1 more source

[A randomized controlled trial of iRoot BP Plus used as pulp capping agent in the complex fracture of young permanent tooth]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Yang Y, Li R, Dou G, Lei Y, Xia B.
europepmc   +1 more source

Evaluation of the accuracy of a fully digital method of measuring sagittal condylar inclination. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Zhou Z, Wang S, Yuan Q, Yue L, Yang S.
europepmc   +1 more source

[Preliminary study on three digital analysis methods for analyzing the distribution and area of occlusal contacts]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban, 2020
Xiao N, Sun YC, Zhao YJ, Wang Y.
europepmc   +1 more source

[Clinical efficacy of in-situ crown reattachment technique combined with pulpotomy in the treatment of complica-ted crown-root fractures of young permanent anterior teeth]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Su X, Guo Q, Ren M, Liu F.
europepmc   +1 more source

[Simultaneous determination of ethylene oxide, 2-chloroethanol and ethylene glycol residues in medical device products by gas chromatography]. [PDF]

Se Pu
Liu RJ, Liu BY, Li H, Shao WL, Feng Y.
europepmc   +1 more source