Results 71 to 80 of about 106,861 (220)
[A case of high-temperature steel bar penetration injury from scrotum to buttocks]. [PDF]
Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi, 2022 Zheng SQ, Miao YL, He LR, Wang BY.
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Rare Metals, EarlyView.ABSTRACT High‐power piezoelectric ceramics which have a wide operating temperature range are essential for sensor and actuator applications in extreme conditions. However, their development is fundamentally hindered by the inherent trade‐off among key parameters (TC, d33, Qm).
Rui Yan +10 more
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Jianzhu Gangjiegou Jinzhan, 2017 利用经试验验证的有限元模型对均匀温度和不均匀温度分布下轴向约束波纹腹板梁的悬链线效应进行了参数分析,选取荷载比、轴向约束刚度比、跨高比及倾角为主要参数,研究了钢梁的跨中挠度、梁端轴力和悬链线弯矩等随温度的变化规律,并给出了火灾下钢梁的临界温度。由于不均匀温度下产生的热弯曲,钢梁在压力阶段的挠度更大而轴力更小。但均匀温度下钢梁的破坏温度比不均匀温度情况时高。钢梁的悬链线温度和破坏温度都随着荷载比的增大而降低。相同荷载比作用下,不同跨高比钢梁的悬链线温度相同,但其破坏温度随跨高比的增大而升高 ...
陈恒超, 刘昌斌
doaj
Using porous metals to enhance heat transfer in phase change materials (PCMs) [PDF]
, 2011 Heat transfer enhancement mechanism of Phase Change Materials (PCMs) by high-porosity metal foams was investigated in this study. The Darcy-Brinkman-Forchheimer modified flow model was employed in the numerical simulations to consider the non-Darcy ...
Tian, Y. (Yuan), Zhao, Changying
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Rare Metals, EarlyView.ABSTRACT MCrAlX coatings are widely used as bond coats in thermal barrier coating systems to protect turbine blades from high‐temperature oxidation. However, their oxidation resistance is often restricted by uncontrolled microstructures, surface roughness, and aggregation of reactive elements (REs). In this study, high‐repetition‐rate femtosecond laser
Wei Qian +7 more
wiley +1 more source
Gaoya dianqi, 2018 户外设备长期工作在高温高湿、低温高湿等情况下,极易形成凝露,危害电路设备的正常运行。针对上述现象,文中在人工环境气候室内搭建了真型开关柜凝露试验系统,记录了不同温差及相对湿度条件下凝露形成时间,并测量了未形成凝露时的柜体内壁温度。结果表明:凝露形成时间是由温差和相对湿度共同影响的,当相对湿度不变时,温差越大,凝露形成时间越短;而当温差不变时,相对湿度越高,凝露形成时间也越短;并且,形成凝露的露点温度始终高于物体表面温度。最后,提出可通过减小温差 ...
郭沁 +4 more
doaj
Jianzhu Gangjiegou Jinzhan, 2021 螺纹锚固单边螺栓是指通过带有螺纹的特殊螺栓孔代替螺母,从而实现单侧安装、拧紧功能的一种螺栓。目前关于该种螺栓连接T形节点在常温下不同破坏模式的受拉承载力计算方法已有研究。但在高温条件下节点变形增大,且高强螺栓与普通钢材在高温下的材性折减规律不一致,导致现有的常温计算公式不能直接用于火灾高温情况,目前仍缺少计算该类节点在高温下承载力的计算方法。根据常温下承载力计算公式,结合高温下节点出现大变形的特点,对现有的计算公式进行修正。并根据现有的试验结果对修正公式进行验证 ...
鲁永贵 +4 more
doaj
Influence of Mold Resistance on the Casting Stress [PDF]
, 1974 Influence of mold is one of the vari ous important factors as the reason of the casting stress.For, the cooling ability, the strength, the expansion rate, and the deformation capacity of mold in hight emperature which have thermal influence when the melt
武部 克嗣, 養田 実
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Wildlife Letters, EarlyView.Climate change drives shifts in suitable habitats for Eurasian lynx and its prey (hare, roe deer) in Mohe, Daxing'anling Mountains. Under RCP scenarios, moderate warming (RCP4.5) promotes substantial habitat expansion, while high‐emission conditions (RCP8.5) lead to strong expansion in the 2050s but slower gains and partial contraction by the 2070s ...
Binglian Liu +5 more
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Behaviors of Work materials on Hot machining [PDF]
, 1956 Both remarkable prolongation of life on the tool edge and considcrable decrease of cutiing force at the tool-chip interface must be satisfied for increase of work efficiency.
村中 利吉, 高辻 雄三
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