Results 101 to 110 of about 12,378 (160)

变电站土壤腐蚀性评价及接地网金属腐蚀特性分析

Dianci bileiqi, 2009
变电站土壤的腐蚀性与接地网金属服役寿命密切相关。分析了某变电站接地网11个典型部位土壤样品的电阻率、氧化还原电位、含水量、含盐量、pH值、Cl-、SO42-、HCO3-、Na+、Ca2+、Mg2+等理化指标,根据相关标准分析、评估该变电站土壤腐蚀性;同时用扫描电镜（SEM）、能谱（EDAX）分析了该变电站接地网金属样品腐蚀特性,认为:土壤的腐蚀性决定于土壤电阻率、氧化还原电位及Cl-、SO42-含量,许多情况下,Cl-与SO42-对接地网金属腐蚀起到促进作用。并提出了防腐方法。
朱志平, 马骁, 荆玲玲, 熊书华, 张辉   +4 more
doaj  

镍基合金等离子堆焊层的组织和性能

Shiyou jixie, 2012
采用光学显微镜、X射线衍射仪（XRD）、扫描电镜（SEM）和显微硬度计，研究了镍基合金等离子弧堆焊层的组织和性能。堆焊的基材为X65管线钢，焊丝是ERNiCrMo-3。研究结果表明，堆焊层由柱状晶和共晶组织组成，堆焊层中的柱状晶为γ固溶体，共晶组织为γ固溶体和Laves 相(富含Mo、Nb)；由腐蚀电化学测试可知，堆焊层的耐蚀性能随着堆焊电流的增大而减弱；氢致开裂试验结果表明，堆焊电流越大，越容易发生氢致裂纹；显微硬度测试结果表明，由基体至堆焊层显微硬度先升高后下降，熔合区硬度最高，可达310 HV以上。
高伟, 刘志豪
doaj  

坯体成型密度对ZnO压敏陶瓷致密化和晶粒生长过程的影响

Dianci bileiqi, 1994
研究了ＺｎＯ压敏陶瓷坯体成型密度对烧成瓷体的致密化和晶粒生长的影响。依据扫描电镜观察分析了晶粒大小、分布情况并测量了瓷体密度。着重指出：控制好晶粒大小、分布和瓷体密度可以改善瓷体电性能；提高坯体成型密度不仅加速了瓷体的致密化，而且能降低晶粒起始生长温度，增大晶粒生长速率，促进晶粒长大。
贾广平, 郭亚平, 刘辅宜
doaj  

[Effect of porous surface structure on fatigue strength of 3D printed zirconia]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Zhao J, Ding Q, Li W, Ma Q, Lan Y, Zhang L, Han J.   +6 more
europepmc   +1 more source

[Giant pleomorphic adenoma of the tubal torus: a case report and literature review]. [PDF]

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi
Yang Y, Wu X, Zeng W, Chen J.
europepmc   +1 more source

[Observation of morphological and molecular biological changes of nasal mucosa in patients with type 2 inflammation chronic rhinosinusitis with nasal polyps after Reboot surgery]. [PDF]

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi
Chen X, Zhu X, Zhu Y, Zhou Z, Fu Z, Liu H.   +5 more
europepmc   +1 more source

[Bacterial biofilm formation of peritoneal dialysis catheter in patients with peritonitis-associated catheter removal]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Liu A, Zhao H, Wu B, Zheng S, Zuo L, Wang M.   +5 more
europepmc   +1 more source

[The advances in the application of image-guided system in endoscopic skull base surgery]. [PDF]

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi
Wang S, Cong T, Su W, Song P, Qin Y.
europepmc   +1 more source

[Preparation of calcium phosphate nanoflowers and evaluation of their antioxidant and osteogenic induction capabilities <i>in vitro</i>]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Jia M, Chen Z, Zhou H, Zhang Y, Wu M.
europepmc   +1 more source

[Defect modification of calcium silicate and its application in oral bacteriostasis and tooth remineralization]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Hu Y, Zhang S, Zhang J, Luo H, Li Y, Zhang J, Chen X.   +6 more
europepmc   +1 more source