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Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators
Hamid M. SEDIGHI, Hassen M. OUAKAD
《结构与土木工程前沿(英文)》 2020年 第14卷 第6期 页码 1520-1530 doi: 10.1007/s11709-020-0672-x
关键词: velocity gradient elasticity theory nanotube resonators differential-quadrature method nonlinear vibration
Amir ALLAHBAKHSHI,Masih ALLAHBAKHSHI
《机械工程前沿(英文)》 2015年 第10卷 第2期 页码 187-197 doi: 10.1007/s11465-015-0339-9
In this paper, for the first time, the modified strain gradient theory is used as a new size-dependent Kirchhoff micro-plate model to study the effect of interlayer van der Waals (vdW) force for the vibration analysis of multilayered graphene sheets (MLGSs). The model contains three material length scale parameters, which may effectively capture the size effect. The model can also degenerate into the modified couple stress plate model or the classical plate model, if two or all of the material length scale parameters are taken to be zero. After obtaining the governing equations based on modified strain gradient theory via principle of minimum potential energy, as only infinitesimal vibration is considered, the net pressure due to the vdW interaction is assumed to be linearly proportional to the deflection between two layers. To solve the governing equation subjected to the boundary conditions, the Fourier series is assumed for w=w(x, y). To show the accuracy of the formulations, present results in specific cases are compared with available results in literature and a good agreement can be seen. The results indicate that the present model can predict prominent natural frequency with the reduction of structural size, especially when the plate thickness is on the same order of the material length scale parameter.
关键词: graphene van der Waals (vdW) force modi- fied strain gradient elasticity theory size effect parameter
Suspended solid abatement in a conical fluidized bed flocculator
Dandan ZHOU, Shuangshi DONG, Keyu LI, Huizhong JIANG, Dandan SHANG
《环境科学与工程前沿(英文)》 2013年 第7卷 第1期 页码 127-134 doi: 10.1007/s11783-012-0415-x
Empirical models and design codes in prediction of modulus of elasticity of concrete
Behnam VAKHSHOURI, Shami NEJADI
《结构与土木工程前沿(英文)》 2019年 第13卷 第1期 页码 38-48 doi: 10.1007/s11709-018-0479-1
关键词: modulus of elasticity normal strength normal weight concrete empirical models design codes compressive strength density
Yue’s solution of classical elasticity in
Zhong-qi Quentin YUE
《结构与土木工程前沿(英文)》 2015年 第9卷 第3期 页码 215-249 doi: 10.1007/s11709-015-0298-6
Simulation of horizontal slug-flow pneumatic conveying with kinetic theory
GU Zhengmeng, GUO Liejin
《能源前沿(英文)》 2007年 第1卷 第3期 页码 336-340 doi: 10.1007/s11708-007-0050-6
关键词: velocity distribution detailed slug-flow gas-solid theory
《结构与土木工程前沿(英文)》 页码 1310-1325 doi: 10.1007/s11709-023-0997-3
关键词: sustainable concrete fly ash slay extreme gradient boosting technique squirrel search algorithm parametric analysis
Prediction of the shear wave velocity
Amoroso SARA
《结构与土木工程前沿(英文)》 2014年 第8卷 第1期 页码 83-92 doi: 10.1007/s11709-013-0234-6
关键词: horizontal stress index shear wave velocity flat dilatometer test cone penetration test
T. CHELIDZE, T. MATCHARASHVILI, V. ABASHIDZE, M. KALABEGISHVILI, N. ZHUKOVA
《结构与土木工程前沿(英文)》 2013年 第7卷 第2期 页码 188-205 doi: 10.1007/s11709-013-0199-5
关键词: real time monitoring telemetry dam tilts diagnostic tools hysteresis nonlinear dynamics
Axisymmetric loading on nanoscale multilayered media
《结构与土木工程前沿(英文)》 2023年 第17卷 第1期 页码 152-164 doi: 10.1007/s11709-022-0895-0
关键词: functionally graded layer Gurtin–Murdoch surface elasticity multilayered medium size dependency stiffness matrix
黄志洵
《中国工程科学》 2005年 第7卷 第3期 页码 6-12
2004年6月,位于西非Oklo的美国Los Alamos实验室的核工业反应堆对实验数据做再分析后得出结论说,近20亿年内精细结构常数减小了4.5×10-8。常数不常,意味着光速有很小的变化。这是最新的与狭义相对论不符的实验报告。另一方面,光子如有质量,Maxwell方程组将被Proca方程组所取代,而磁矢位(势)A将成为可观测量。而过去和现在都有许多方法测量光子的质量。
文章的主要目的是在Proca理论框架内研究电磁波波速,发现即使在自由空间(真空)条件下也会出现超光速传播;同时又对波导与Proca波的截止现象做了比较,给出了相应的结果。
关键词: 狭义相对论 Maxwell方程组 Proca方程组 电磁波波速 光子的静止质量
Thuy-Anh NGUYEN; Hai-Bang LY; Van Quan TRAN
《结构与土木工程前沿(英文)》 2022年 第16卷 第10期 页码 1267-1286 doi: 10.1007/s11709-022-0842-0
关键词: slender beam shear strength gradient boosting optimization algorithms
Gradient-based compressive image fusion
Yang CHEN,Zheng QIN
《信息与电子工程前沿(英文)》 2015年 第16卷 第3期 页码 227-237 doi: 10.1631/FITEE.1400217
关键词: Compressive sensing (CS) Image fusion Gradient-based image fusion CS-based image fusion
Influence of freeze–thaw damage gradient on stress–strain relationship of stressed concrete
《结构与土木工程前沿(英文)》 页码 1326-1340 doi: 10.1007/s11709-023-0014-x
标题 作者 时间 类型 操作
Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators
Hamid M. SEDIGHI, Hassen M. OUAKAD
期刊论文
Vibration analysis of nano-structure multilayered graphene sheets using modified strain gradient theory
Amir ALLAHBAKHSHI,Masih ALLAHBAKHSHI
期刊论文
Suspended solid abatement in a conical fluidized bed flocculator
Dandan ZHOU, Shuangshi DONG, Keyu LI, Huizhong JIANG, Dandan SHANG
期刊论文
Empirical models and design codes in prediction of modulus of elasticity of concrete
Behnam VAKHSHOURI, Shami NEJADI
期刊论文
Simulation of horizontal slug-flow pneumatic conveying with kinetic theory
GU Zhengmeng, GUO Liejin
期刊论文
prediction and optimization design of sustainable concrete based on squirrel search algorithm-extreme gradient
期刊论文
Real time monitoring for analysis of dam stability: Potential of nonlinear elasticity and nonlinear dynamics
T. CHELIDZE, T. MATCHARASHVILI, V. ABASHIDZE, M. KALABEGISHVILI, N. ZHUKOVA
期刊论文
Predicting shear strength of slender beams without reinforcement using hybrid gradient boosting trees
Thuy-Anh NGUYEN; Hai-Bang LY; Van Quan TRAN
期刊论文