Results 71 to 80 of about 16,458 (194)
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
wiley +1 more source
Gaoya dianqi, 2017 对比永磁操动机构,磁力机构具有出力大、行程长等优点,可用于中高压等级。在126 kV真空灭弧室研制成功的基础上,文中提出一种适用于126 kV单断口真空断路器的新型长行程磁力操动机构。利用Ansys仿真软件对126 kV磁力机构静态特性进行仿真设计,通过改变辅助永磁体排列方式、端盖封装方式增大了机构合闸保持力,采用增大合闸保持力的方法使机构分闸速度得到提高。分析了充电电容、线圈匝数等电气参数对磁力机构动态特性的影响,并在此基础上进行了参数优化。仿真结果表明,文中设计的126 ...
许家源 +6 more
doaj
A preliminary study on the propagation law of elastic wave through a soilbag [PDF]
, 2022 Cheng, Hongyang, Jia, Fan, Liu, Sihong
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THE ANALYSIS OF FLOOR RESPONSE SPECTRUM IN EQUIPMENT-STRUCTURE INTERACTION FORM IN FREQUENCY DOMAIN [PDF]
, 2006 直接从由建筑物和设备组成的主次结构耦合系统各自的动力特性出发,考虑主次结构间调谐、干扰、非经典阻尼等因素的影响,推导出频率传递函数和次结构的加速度均方根响应,并由此进一步得到楼层的加速度均方根反应谱。这一方法避免了求解联合系统的复特征值和动力方程出现病态等问题,大大简化了计算过程。最后在算例中就次结构的阻尼比、质量比、安装楼层及场地土等因素对楼层加速度均方根反应谱的影响进行了讨论,算例表明,质量比是决定能否采用古典谱的关键因素,场地土对反应谱的影响也不容忽视。Based on the dynamic ...
张建霖, 张灿辉, 杨安钦
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Conservation Biology, EarlyView.Abstract Prioritization in conservation is crucial for the development of efficient and effective decision‐making policies. For many decades, the importance of some species and their habitats has been assessed and applied in conservation legislation, but bats and their diurnal roosts have ofbeen overlooked.
David López‐Bosch +6 more
wiley +1 more source
Gaoya dianqi低频风电变压器是海上风电用柔性低频交流输电系统的关键设备。为进一步了解低频变压器在短路冲击下的振动特性和受力特性，采用镜像法计算变压器绕组漏磁场，并建立了绕组轴向振动的非线性动力学模型，对一台5 000 kVA低频变压器在17 Hz和50 Hz下的短路冲击振动特性和受力进行了分析。研究结果表明，17 Hz下变压器绕组中的短路冲击电流、振动位移、轴向受力和辐向受力均小于50 Hz时的结果，但绕组振动特性基本相同；17 Hz下绕组垫块面积减小32.5%时垫块的最大压缩力应力与50 Hz时相同；17 ...
吴鹏 +4 more
doaj
Shuitu Baochi Xuebao, 2002 坡面径流不同于一般明渠水流，具有独特的水力学特性。详细论述了坡面径流产流理论、运动方程和水动力学特性等方面的研究进展情况，系统阐述了国内外对坡面径流的流态、流速测量和分析、水深确定、阻力表达以及径流分离挟沙能力等水动力学要素的研究，目的在于总结以往的研究经验和成果，促进相关研究的进一步发展。
郑良勇 李占斌 李鹏
doaj
Dynamic Characteristics of the Galerkin Meshfree Formulation for Mindlin Plate with Stabilized Conforming Nodal Integration [PDF]
, 2012 剪切自锁问题一直是考虑剪切变形的Mindlin板数值方法研究中的核心内容。稳定节点积分无网格法通过构造节点光滑曲率和相应的形函数节点光滑梯度，并利用节点积分方法来建立刚度矩阵，其中Mindlin板内能的弯曲部分采用光滑梯度，而对剪切部分则采用直接梯度。该方法能够准确再生Kirchhoff弯曲模式，具有弯曲准确和稳定高效的特点。本文对该方法的动力特性进行了系统的研究，主要包括Timoshenko梁和Mindlin板稳定节点积分无网格法的频散特性以及Mindlin板的时程分析 ...
张一岭
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Undrained deformation characteristic of saturated soft clay under traffic loading [PDF]
Previous studies on the undrained deformation behavior of saturated soft clay under traffic loading usually ignored the effect of cyclic confining pressure.
Lei SUN, Yuke WANG
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Current status and developing recommendations of tailings dam failure [PDF]
, 2018 This is the final version of the article. Available from Hindawi Publishing Corporation via the DOI in this record.Tailings dam failure accidents with limited emergency response time and huge potential threats, can often lead to heavy casualties and ...
Bu, L +4 more
core +1 more source