Results 91 to 100 of about 16,679 (163)
Dianci bileiqi, 1997 介绍利用有限元法和电阻应变测量法对棒形支柱绝缘子在弯曲负荷下的应力分析，通过两种分析方法证实了伞裙对弯曲应力的影响及其产生应力集中的大小与伞根圆弧大小的关系，从而对产品设计提供有益指导。
晏坚军, 李大楠, 王松钧
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Analysis of the effect of cutting depth under thick immediate roof on gob-side entry retaining stability [PDF]
The stability of gob-side entry retaining with roof cutting and pressure relief is primarily influenced by roof cutting parameters. However, determining appropriate cutting parameters for gob-side entry under the effect of a thick immediate roof is ...
SHI Xinyu +3 more
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Study on pressure relief range of overlying strata and accurate gas extraction of adjacent strata in superimposed mining of coal seam [PDF]
Aiming at the mining problem of No.9 coal seam with strong outburst danger in Xinyuan Coal Mine, we proposed that to mine No.3 coal seam as the upper protective layer first, by analyzing the failure mechanism of roof and floor after coal seam mining, the
Haidong WANG +5 more
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Jianzhu Gangjiegou Jinzhan型钢混凝土组合结构中采用超高性能混凝土（ultra-high performance concrete，UHPC）可以提高承载能力、减小截面尺寸，同时改善其因密集配置箍筋和剪力件而导致的施工复杂等问题。目前型钢UHPC组合梁有限元仿真研究主要集中在受弯性能参数化定性分析，忽略了型钢与UHPC间的黏结滑移，缺少对其界面黏结性能和组合效应的评估，对受拉区UHPC的受力性能也缺乏深度讨论。对型钢UHPC组合梁开展基于Abaqus的受弯性能有限元仿真分析，对UHPC强度、型钢强度 ...
沈德建 +4 more
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Dianci bileiqi, 1997 阐述了一种用于MOA在线监测的并行同步采集法。在一定硬件的辅助下，完成U、I两路信号的并行同步采集。该采集法对电网电压频率波动有自适应能力，并在现场应用中取得了较好的效果。
陈继东, 周龙, 文远芳
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, 2011 以中间相萘沥青(AR树脂)和各向同性煤沥青(ICP)为原料,系统研究了沥青原料性质与由其制备的碳纤维结构、性能之间的关系。研究表明,AR树脂中的一维有序中间相结构在纺丝中被拉伸,形成不同中间相间的界面,成为应力集中区,在后续碳化过程因应力释放导致纤维开裂而损害其力学性能;而ICP沥青基本为无定形相结构,在纺丝过程中无明显的择优取向,碳化过程石墨化程度低,故其所成的碳纤维无应力集中和开裂问题,但也正是这无定形结构,使其最终力学性能也较差。以上结果说明,原料的性质可以"遗传"到沥青基碳纤维中。因此 ...
刘安华 +4 more
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Failure mechanism and controlling measures of cut slope instability at Shouling temple, Luhuo County, Sichuan Province [PDF]
The Shouling temple in Luhuo County, Sichuan faces an urgent situation due to the construction of the Future Hall. A five-level excavation slope with a height of 21.8 m and a slope angle of 55° to 75° was formed on the northwest side of the site, leading
Gang LUO, Heming REN, Xingzheng WANG
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Dizhen xuebao野外地质调查发现金沙江断裂带北段麦宿断裂附近发育长约50 km的地震地表破裂带，其最大垂直位移为2 m。基于该地震地表破裂带周围架设的密集地震台阵于2020 年 12 月至 2022 年 7 月期间记录到的连续波形数据，采用双差定位方法对（31.55°N—31.85°N，98.31°E—98.98°E） 区域内的578个地震事件进行定位，并利用基于P波初动的HASH方法对定位得到的地震事件进行震源机制解反演，获得了37组震源机制解 ...
Yifeng Wu, Fangtou Tang, Xudong Jiang
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Dianci bileiqi, 1982 本文以锥形头部的悬式绝缘子为主要对象,讨论了在热机试验时瓷件头部承受机械应力、温度应力、残余应力、局部应力集中的情况,介绍了热机试验装置的概况、热机试验方法及其试验结果,并对试验结果进行了分析,最后提出了提高悬式绝缘子热机性能的几点意见。
魏光大, 曾明求
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Study on pressure relief effect of multiple mining of protective layer in medium and long distance coal seam group [PDF]
Aiming at the problem that the effect of protective layer mining of medium and long distance coal seam group under complex conditions is not clear, this study takes the coal seam group mining of Shanxi Xinjing Coal Mine as the engineering background, and
Aitao ZHOU +5 more
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