Results 21 to 30 of about 15,531 (185)
Research on Influence of Drilling and Blasting Method on Structures Nearby During Tunnel Excavation [PDF]
, 2017 采用钻爆法开挖隧道时,爆破振动将不可避免地对临近构筑物产生影响。文章以贵州盘兴高速上坡地隧道为研究背景,对该隧道施工方案及爆破振动计算原理进行了分析,通过LS-DYNA建立了该隧道的计算模型,模拟了隧道中药包爆炸过程,计算分析出岩体的受力及位移情况;研究爆炸产生的振动冲击波下输电塔的响应特征,提出隧道不同区段的爆破开挖优化设计方案,为类似工程提供参考和技术支撑。Drilling and blasting method are widely used in the excavation of tunnel,
冯恺, 张宁, 毛金龙, 洪阳洲
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Rare Metals, EarlyView.ABSTRACT Internal oxidation has been identified as an effective method for enhancing the strength of AgMg alloys. However, the concurrent occurrence of embrittlement remains inadequately understood, thus limiting their broader application. This study investigates the oxidation behavior of AgMg alloys with Mg concentrations ranging from 1 at% to 7 at ...
Hai‐Cheng Zhu +12 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT The transformative potential of gallium nitride high electron mobility transistors (GaN HEMTs) in advancing carbon‐neutral power systems remains bottlenecked by contact resistance (Rc) at the metal–semiconductor (M‐S) interface, a critical determinant of switching losses and frequency response.
Ji‐Zhou Zhang +8 more
wiley +1 more source
Gaoya dianqi, 2022 海上换流阀在运行期间的安全性关系到海洋风电的有效输送。为研究支撑式海上换流阀塔运行期间的结构响应，依据某工程中的海上柔直换流阀建立有限元模型，通过模态分析和时程分析，研究了换流阀塔的自身振动特性和在环境荷载作用下的动力响应。结果表明，换流阀塔弱轴振动方向为连接前后两个单塔的方向，外荷载作用下将在此方向产生较大动力响应，换流阀塔运行期间的最大位移和最大应力均满足安全要求。
马志荣 +8 more
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Zhejiang Daxue xuebao. Lixue ban, 2003 本文提出的加肋穹顶索杆结构是一种极有潜力的新型空间结构,为深入了解该类结构的特性,使其能应用于工程实践,对它的动力性能进行了分析.文中采用子空间迭代法及时程法对结构进行计算.首先分析了各种布索下的结构频率及布索但不施加预应力情况下结构的动力性能;接着对结构在7种布索工况下的动内力进行了分析,取得了不同位置的索对结构刚度影响的差异;最后,为进一步探讨该种结构的动力性能,分别就5种矢跨比下结构的动内力进行了比较和分析,取得了结构内力变化相对平缓的结果.由此得出了索的不同布置对结构频率有明显影响 ...
GAOBo-qing(高博青) +2 more
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Study on dynamic response of saturated soil around piles under vertical vibration [PDF]
A coupled pile-saturated soil model is proposed to investigate the response of saturated soil under three-dimensional axisymmetric conditions based on Biot's theory of saturated porous media.
FU Pengcheng1, 2 , WU Juntao1, 2 , YI Enze1, 2, WANG Kuihua1, 2, ZHANG Zhiqing3, TANG Lüjun4
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Smart Biomaterials and Dressings for the Treatment of Chronic Inflammatory Skin Diseases
Rare Metals, EarlyView.ABSTRACT Chronic inflammatory skin diseases, encompassing immune‐inflammatory conditions and infection‐associated dermatoses, pose significant clinical challenges due to high prevalence, recurrence, and therapeutic resistance, affect over 30% of the global population.
Zehao Lan +5 more
wiley +1 more source
Dizhen xuebao采用高精度间接边界元方法（IBEM）开展了山体−隔震层−隧道的整体响应分析，研究了P波入射下柔性隔震层对高斯形山体内双线隧道地震动响应的减弱作用。在隔震层与围岩之间考虑了碎土的错动滑移，以模拟不完美交界面，并系统讨论了隔震层弹性模量、厚度、P波入射频率等因素对隧道地震动响应的影响。数值模拟结果表明：适当增加隔震层厚度可以显著降低隧道应力，有效提升隔震效果，应力降低幅度约达50%以上，且使得结构受力更为均匀；随着隔震层材料的弹性模量减小，隧道动应力数值明显减小，有效减少了其应力放大区的面积 ...
Lei Huang +5 more
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Dizhen xuebao, 2022 为探讨“最不利地震动”概念在地下结构抗震设计中的适用性，以软土地铁区间隧道为对象建立相应的地层-结构动力分析模型。以直径变形率为分析指标，基于动力时程方法研究18条不同输入地震动作用下隧道结构动力响应的分布及差异性，得出基于隧道地震响应的输入地震动排序，并通过调幅手段对比分析了地面峰值加速度（PGA）和隧道埋深变化对隧道结构地震动响应排序的影响规律。最后，评价了不同输入地震动参数，包括峰值加速度、峰值速度、峰值位移、绝对累积速度（CAV）和阿里亚斯（Arias）强度（IA）与隧道地震响应之间的相关性 ...
Haitao Yu, Jing Li, Qi Wang
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