Results 1 to 10 of about 7,370 (165)
Effects of Breccias and Round Gravels on Steep Cut Slope Runoff and Sediment Yield Under Simulated Rainfall [PDF]
, 2023 [Objective] The effects of breccias and round gravels on steep cut slope infiltration, runoff, sediment yield, and hydrodynamic characteristics were analyzed in order to provide a theoretical basis for a soil erosion prediction model and soil ...
Cao Longxi +5 more
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Numerical simulation of leakage and diffusion of buried pure hydrogen/hydrogen-doped natural gas pipeline [PDF]
, 2023 In order to study the diffusion characteristics of pure hydrogen/hydrogen-doped natural gas in the soil environment, a three-dimensional leakage model of the buried pure hydrogen/hydrogen-doped natural gas pipeline was established by Fluent software.
Baojin QI +3 more
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Xibei Gongye Daxue Xuebao, 2022 为实现水下滑翔机低功耗、长航程的目标, 提高水下滑翔机升阻比是切实可行的手段之一。采用翼身融合布局设计了一款翼身融合水下滑翔机(blended-wing-body underwater glider, BWBUG), 利用NURBS样条曲线构建BWBUG的精细化参数模型, 以升阻比为优化目标, 运用组合优化算法, 开展BWBUG的多参数优化研究, 建立优化算法与黏流软件接口, 优化过程中直接耦合调用水动力计算, 大大提高了优化效率。结果表明, 优化后的BWBUG模型升力系数提升了0.58 ...
LING Hongjie +4 more
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Experiment Investigation on Plate Type Heat Exchanger Used as Indirect Evaporative Cooler [PDF]
, 2010 An experimental investigation was conducted on the performance of a crossflow plate type heat exchanger used as an indirect evaporative cooler.It is found that both the air mass flow rate and the ratio of the mass flow rate have a significant effect on ...
任承钦 +4 more
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Study on gas-liquid mass transfer of toluene in an emulsion liquid membrane(甲苯在乳化液膜中的气液传质研究)
Zhejiang Daxue xuebao. Lixue ban, 2011 研究了温度、液相搅拌速度、表面活性剂体积分数等因素对乳化液膜吸收甲苯气体的气液传质影响，实验发现甲苯在乳化液膜体系中的气液传质系数随着温度的上升而增大，随液相搅拌速度的增大而增大；表面活性剂会增大气液传质阻力，减小气液传质系数，表面活性剂体积分数2%时对甲苯气液传质产生的阻力占总传质阻力的31.9%.
CHENGJi(程吉) +2 more
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Shuitu Baochi Xuebao, 1994 采用模拟降雨的试验方法，在分析计算有无雨滴击溅作用坡面薄层水流水力摩阻系数的基础上，进一步分析了雨滴击溅作用对薄层水流水力摩阻系数的影响。结果表明，雨滴击溅作用可减少薄层水流的水力摩阻系数，从而减少水流摩擦阻力，使水流侵蚀力相对增大；有雨滴击溅作用时其水力摩阻系数平均为无雨滴击溅时的６６．１４％。这说明雨滴的击溅除了本身的分散和破坏土壤结构等侵蚀作用外，还可降低水流的水力摩阻系数 ...
吴普特 周佩华
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Effect of the morphologies of non-metallic inclusions on their removal behavior [PDF]
, 2016 The differences in shape correction coefficient(SCC) of common inclusions in molten steel including spherical,cubic,cylindrical,dendritic and cluster particles were studied by a physical simulation method.
HAO Yang +3 more
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Construction of Ecological Security Pattern in Ecological Barrier Zone of Loess Plateau Based on “Importance-Sensitivity-Landscape Features” [PDF]
, 2022 [Objective] The relationship between ecological spatial network structure and soil conservation was analyzed in order to provide countermeasures and suggestions for improving ecosystem services in the Loess Plateau barrier region.
Liu Hongjun +5 more
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Gaoya dianqi, 2023 有效降低架空导线的风阻系数是确保线路安全稳定运行以及应对极端自然条件的关键。为获得更低风阻系数的导线，基于表面形状设计原理，文中研究了具有不同表面结构的架空线，并利用风洞试验研究了架空线开口角、小圆弧曲率半径和凹槽深度等因素对导线风阻力系数的影响。获得了在不同风速范围内，随开口角和小圆弧曲率半径不同，导线风阻力系数的变化规律。实验结果表明，开口角为90°，曲率半径为3.5 mm的架空线，在35 m/s的风速时的风阻力系数最小，并且对其进行了多种力学性能测试，结果均符合标准要求 ...
李锐海 +5 more
doaj
, 2017 文章基于一种简易＂浸入边界技术＂与流固耦合方法对超声速来流条件下的三维降落伞系统进行了数值模拟。研究中,降落伞系统包括前体和伞体,两者通过伞绳连接。文章的研究目的是分析不同攻角下降落伞伞绳对于降落伞系统周围复杂非定常流场的影响,以及对降落伞性能表现的影响。结果表明：在较小的前体和伞体距离下,由于攻角的影响,非定常流场结构呈现上下不对称,并且上下伞绳激波形成时间不同步。随着攻角的增加,上下面的伞绳激波形成时间出现推迟,并且有变弱的趋势。另外,由于攻角与伞绳的综合影响 ...
张德良 +3 more
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