STUDY ON THE MECHANISM OF ALUMINA CERAMIC SHAPE MEMORY MECHANISM
, 2013 采用粒径为0.5微米的自制氧化铝超细粉,采用低温快烧工艺在CaO—MgO—Al2O3—SiO2体系中制备了氧化铝含量为95.84%的95氧化铝陶瓷管壳和纯氧化铝陶瓷管壳。氧化铝陶瓷管壳在煅烧过程中发生了形状记忆,氧化铝含量不同,发生形状记忆的温度也不同。95瓷管壳在1200℃开始发生变形,1400℃开始回复原来的状态;而纯氧化铝瓷1250℃开始发生变形,1500℃开始回复原来的状态。对各个温度煅烧的95瓷坯料进行XRD分析表明陶瓷内没有相变的发生,说明氧化铝陶瓷的形状记忆效应不是由相变引起的 ...
钟莲云, 吴伯麟
core
, 2005 针对存在混凝土衬砌与否两种情况，对油井套管-膨胀围岩体系进行了三维轴对称有限元分析。结果表明，在围岩产生的膨胀压力下，存在混凝土衬砌时，径向位移最大值发生于混凝土衬砌与膨胀岩交界处；没有混凝土衬砌时，径向位移最大值在油井套管与膨胀岩的交界处。故完好的混凝土衬砌能明显地减缓膨胀岩对油管套管的挤压作用。在围岩膨胀压力下 ...
章根德, 鲁晓兵
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[Double-layer ceramic technique for restoring severely discolored nonvital maxillary anterior teeth: a case report]. [PDF]
Hua Xi Kou Qiang Yi Xue Za ZhiChen J, Yin L.
europepmc +1 more source
[Independent innovation research, development and transformation of precise bionic repair technology for oral prosthesis]. [PDF]
Beijing Da Xue Xue Bao Yi Xue Ban, 2022 Sun YC, Guo YQ, Chen H, Deng KH, Li WW.
europepmc +1 more source
Dianci bileiqi, 1992 直流高压穿墙套管在工作电压下多次闪络。临界条件是表面污染、雾露润湿以及非均匀淋雨使近地端形成干区。为此,研究试验了两种方法进行模拟,即清洁雾法及局部淋雨法。试验了空瓷套及套管。试验表明,在0.02mg/cm～2 盐密下清洁雾时污闪场强为67kV/m,局部淋雨时为76kV/m,空瓷套闪络电压高得多。采用每0.44m增加一个硅橡胶伞套（伞伸出250mm）,使污闪场强提高31％～82％,尤以清洁雾为最佳。改变伞套结构 ...
doaj
[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 BanZang H, Liang Y.
europepmc +1 more source
[Progress in research and development of soft tissue three-dimensional bioprinting and its supporting equipment]. [PDF]
Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi, 2022 Hu YK +5 more
europepmc +1 more source
[Discussion on the application of clear aligner treatment in multidisciplinary complex cases]. [PDF]
Hua Xi Kou Qiang Yi Xue Za ZhiLai W.
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[Transcutaneous osseointegration for amputees: foundational principles and current concepts]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiJason S H +3 more
europepmc +1 more source
[Clinical dilemma and indication selection of restoration for permanent tooth defects in adolescents]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanCheng Y, Li D, Zhao Y, Xia B, Liu Y.
europepmc +1 more source