Results 11 to 20 of about 4,276 (156)
Research on Bearing Capacity of Angle Steel Transmission Tower Subject to Parallel Reinforcement by Fitting Channel Steel [PDF]
, 2023 [Introduction] The existing angle steel transmission tower has been running for many years, and the structural damage leads to the reduction of service performance.
Donghong ZHANG +4 more
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Research on energy dissipation characteristics and coal burst tendency of fissured coal mass [PDF]
, 2023 Coal burst tendency is the natural property of whether coal rock mass can have coal burst, and the distribution of fissures has an important influence on it.
Guoshui TANG +5 more
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Jianzhu Gangjiegou Jinzhan, 2021 中空夹层圆钢管混凝土短柱在轴压作用下,混凝土材料受到内外钢管约束处于三向受压状态,其抗压承载力较普通混凝土有较大提升。提升幅度与侧压应力有直接关系,侧压应力大小取决于截面尺寸及其所受轴力。现行设计方法认为同一构件在轴压和纯弯状态下侧压应力大小相同,对于偏压状态下的侧压应力如何考虑未明确说明。对此,引入与轴力相关的侧压应力系数β修正混凝土的本构关系,明确在各种受力状态下如何考虑侧压应力的影响。还提出一种应力积分算法用于计算短柱构件的极限承载力,得到短柱截面的轴力-弯矩(N-M)曲线。最后 ...
谌扬宇 +4 more
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Lughawiyah: Journal of Arabic Education and Linguistics, 2019 Ϻ┘ä┘àÏ┤┘â┘äÏ® Ϻ┘äÏúÏ│ϺÏ│┘èÏ® ┘ä┘çÏ░Ϻ Ϻ┘äϿϡϽ ┘ç┘è ┘ç┘ä ┘è┘êϼϻ ϬÏúϽ┘èÏ▒ Ϻ┘äÏÀÏ▒┘è┘éÏ® Ϻ┘ä┘àÏ▓Ï»┘êϼϮ Ï╣┘ä┘ë ┘à┘çϺÏ▒Ï® Ϻ┘ä┘éÏ▒ϺÏíÏ® Ï╣┘åÏ» Ϻ┘äϬ┘äϺ┘à┘èÏ░ ┘ü┘è ┘àÏ╣┘çÏ» Ϻ┘äϺÏ│Ϭ┘éϺ┘àÏ® Ϻ┘ä┘àϬ┘âϺ┘à┘äÏ® Ϻ┘äÏÑÏ│┘äϺ┘à┘èÏ® Ï¿Ï│┘è┘àϺ┘êϺ┘åϼ Ïú┘ê┘àÏ¿┘è┘ä┘è┘å.
Septika Rudiamon +2 more
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Experimental study on permeability evolution of slender coal pillar of entry driven along goaf [PDF]
, 2023 Under the condition of roadway driving along goaf, slender coal pillar is affected by multiple mining-induced disturbances, and the permeability of coal and rock mass affected by mining will change due to the development and compaction of mining ...
Bingjie HUO +5 more
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Experimental study on permeability and mechanical properties of coal under different pore pressure and confining pressure [PDF]
, 2023 With the continuous increase of coal mining depth, the response of coal mechanics and the mechanism of gas migration have become extremely complicated. In order to explore the coal damage evolution and gas seepage mechanism under the integrated operation
Bobo LI +5 more
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Dianci bileiqi, 2023 针对同轴电缆耦合强电磁脉冲产生的感应过电压对同轴电缆终端设备造成暂时或永久性损害的问题，用理论和试验相结合的方法，采用有界波模拟器模拟2.3/23 ns电场波形，选用SYN-75-3-1-64网无氧铜008M型号的监控线作为同轴电缆耦合对象进行试验，得出以下结论：1)当场间电场强度作为自变量时，随着电场强度的增大同轴电缆耦合到的电压也会变大；2)电场强度一定时，同轴电缆在电场中耦合到的电压会随着耦合长度的增加而变大；3)同轴电缆耦合到的电压还与摆放角度相关，同轴电缆与电场方向的夹角越大 ...
李祥超, 王贤超, 欧阳文, 王兵
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Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, Volume 250, Issue 2, Page 1231-1247, April 2026.Summary Rapid environmental change reshapes both abiotic stress and biotic interactions, yet it remains unclear how these combined forces structure plants' genomic adaptation. In particular, the joint influence of temperature and pollinator identity, two ecological axes undergoing simultaneous global shifts, has rarely been quantified at genomic ...
Yanqian Ding, Florian P. Schiestl
wiley +1 more source
Efficient Simulation Methods for Reinforced Concrete Columns with Encased Steel in High-rise Building Structures [PDF]
, 2016 型钢混凝土柱在建筑结构中往往是主要的承重构件之一，使用合适的数值模型分析其力学性能对高层结构抗震分析有重要的意义。本文综述了目前文献中已有的低含钢率恢复力模型相关研究，分析了其理论、计算流程和算法，并在通用有限元软件OpenSees中编程实现。本文详细推导了模型中基本参数的确定方法，并用于模拟实际高层建筑结构中的型钢混凝土柱。首先，本文用恢复力模型模拟了单根型钢混凝土柱的试验，通过对比验证了模型的精度，研究了其计算效率。其次，本文将恢复力模型用于理想32层高层结构中的单排型钢混凝土构件静、动力分析中 ...
曾志弘
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Dianci bileiqi, 2023 针对雷电电磁波对具有金属管保护的架空同轴线造成传输信号干扰、设备损坏等问题，通过对同轴线耦合理论的分析，利用理论与试验相结合的方法，采用大型雷电冲击发生器模拟雷电流进行冲击试验，得到以下结论：随着冲击电流的增大，线缆上的耦合电压也越大，金属管内的同轴线耦合的电压总比管外的同轴线耦合电压更小，管径越大耦合电压更小，当管径达到一定尺寸时，可以将管内的同轴线耦合电压降低在1 V以下，有效保护线缆终端的电子设备不受到过电压而有损坏；由频谱图可知，耦合的最大振幅均集中在10 kHz ...
李祥超 +5 more
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