检索范围:
排序: 展示方式:
《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
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
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
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
Peiwen Liu, Carsten Mai, Kai Zhang
《化学科学与工程前沿(英文)》 2018年 第12卷 第3期 页码 383-389 doi: 10.1007/s11705-018-1718-7
Hydrogels with precisely designed structures represent promising materials with a broad application spectrum, such as for sensor, tissue engineering and biomimetic technology. However, with highly reactive compounds, the preparation of hydrogels still needs an efficient approach for desired distribution of each component within hydrogels. In addition, a method for in situ preparation of gradient hydrogels is still lacking. Herein, we report the formation of hydrogels with either uniform or gradient internal structures via a novel, simple but very efficient method by aerating ammonia gas (NH3 gas) into the solution of dialdehyde cellulose (DAC) and a diamine. As-prepared hydrogels exhibited uniform microscopic and chemical structure or gradient distribution of functional groups. Due to lots of aldehyde groups on DAC chains, functional hydrogels can be prepared by using diverse diamines. For instance, hydrogels prepared by using 1,6-hexanediamine as a cross-linker were responsive to pH values. Moreover, this controllable process of aerating NH3 gas allows the in situ formation of gradient hydrogels; for instance, by using cyanamide as a reaction counterpart, gradient hydrogels with gradient distributions of cyanide groups were prepared.
关键词: hydrogel uniform gradient dialdehyde cellulose ammonia gas diamine
Dongdong WANG, Jiarui WANG, Junchao WU, Junjun DENG, Ming SUN
《结构与土木工程前沿(英文)》 2019年 第13卷 第2期 页码 337-352 doi: 10.1007/s11709-018-0467-5
关键词: meshfree method landslide rainfall three-dimensional two-level gradient smoothing nodal integration
Effects of gradient concentration on the microstructure and electrochemical performance of LiNi
Wenming Li, Weijian Tang, Maoqin Qiu, Qiuge Zhang, Muhammad Irfan, Zeheng Yang, Weixin Zhang
《化学科学与工程前沿(英文)》 2020年 第14卷 第6期 页码 988-996 doi: 10.1007/s11705-020-1918-9
关键词: gradient concentration Ni-rich LiNi0.6Co0.2-Mn0.2O2 electrochemical performance lithium-ion battery
Experimental investigation on possibility of oxygen enrichment by using gradient magnetic fields
CAI Jun, WANG Li, TONG Lige, SUN Shufeng, WU Ping
《化学科学与工程前沿(英文)》 2007年 第1卷 第3期 页码 271-276 doi: 10.1007/s11705-007-0049-x
Olivier Schaetzle, Cees J. N. Buisman
《工程(英文)》 2015年 第1卷 第2期 页码 164-166 doi: 10.15302/J-ENG-2015046
在本文中,我们概述了盐度梯度技术的最新发展情况。在描述最先进盐度梯度技术的发展现状之前,我们首先介绍了盐度差能概念。本文以盐度梯度技术新兴领域中的新趋势作为结尾。
关键词: 盐度差能,压力延缓渗透,反向电渗析
金属玻璃形成过程中纳米密度梯度对结构的稳定作用 Article
周少雄, 董帮少, 王岩国, 秦敬玉, 汪卫华
《工程(英文)》 2023年 第29卷 第10期 页码 120-129 doi: 10.1016/j.eng.2023.01.010
合金熔体急速冷却导致金属玻璃中原子的短程有序分布和结构的无序,并使金属玻璃的微观结构出现除短程序外的多种可能特征。本文利用电子断层成像和基于非晶模型的成像模拟技术表征了Zr60Cu30Al10金属玻璃中的纳米密度梯度结构,该纳米密度梯度源于按原子堆垛密度递减顺序排列的原子团簇群,并构成了不均匀的金属玻璃中程微观结构。三维重构像中由特定表面构成的大尺寸多面体与类二十面体团簇对应,同时也揭示了这些高原子堆垛密度原子团簇的空间分布情况。各种原子团簇按原子堆垛密度递减方式排列作为合金熔体玻璃化凝固过程中潜在的本征分布规律,能够起到稳定过冷熔体和金属玻璃结构的作用。
基于纳米孔渗透获取盐度梯度能量发电的可行性研究 Article
王樟新, Li Wang, Menachem Elimelech
《工程(英文)》 2022年 第9卷 第2期 页码 51-60 doi: 10.1016/j.eng.2021.02.016
随着具有离子选择性纳米通道的新型材料的研发,一种获取盐度梯度(蓝色)能量的新技术被提出,即纳米孔发电机(NPG)。在本研究中,我们对膜片尺度和组件尺度的NPG运行的实际性能进行了全面分析。结果表明,虽然NPG 膜片可以在理想条件下产生超高的功率密度,但由于浓度极化效应,实际运行中NPG膜片上产生的功率密度很难达到10 W·m−2。对于组件尺度的NPG运行,我们估算了功率密度和可提取比能(即使用单位总体积工作溶液可产生的能量),并基于浓度极化与高浓度溶液和低浓度溶液的混合程度之间的相互作用,阐明运行条件对这两个指标的影响。此外,我们还开发了一个用来评估NPG 系统可行性的模型框架。结果表明,对于使用海水与河水的NPG 系统,总可提取比能非常低(约0.1 kW·h·m−3),且受到系统运行能耗的影响(特别是海水和河水溶液的汲取与预处理能耗)。总的来说,NPG系统产生的净可提取比能(< 0.025 kW·h·m−3)和净功率密度(< 0.1 W·m−2)非常低。我们的研究重点指出了NPG在现实运行中存在极大的局限性,进而对NPG作为一种蓝色能量收集技术的可行性提出了质疑。
关键词: 纳米孔发电机 盐度梯度(蓝色)能量 功率密度 可提取比能
Development of machine learning multi-city model for municipal solid waste generation prediction
《环境科学与工程前沿(英文)》 2022年 第16卷 第9期 doi: 10.1007/s11783-022-1551-6
● A database of municipal solid waste (MSW) generation in China was established.
关键词: Municipal solid waste Machine learning Multi-cities Gradient boost regression tree
标题 作者 时间 类型 操作
prediction and optimization design of sustainable concrete based on squirrel search algorithm-extreme gradient
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
Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators
Hamid M. SEDIGHI, Hassen M. OUAKAD
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
Preparation of hydrogels with uniform and gradient chemical structures using dialdehyde cellulose and
Peiwen Liu, Carsten Mai, Kai Zhang
期刊论文
A three-dimensional two-level gradient smoothing meshfree method for rainfall induced landslide simulations
Dongdong WANG, Jiarui WANG, Junchao WU, Junjun DENG, Ming SUN
期刊论文
Effects of gradient concentration on the microstructure and electrochemical performance of LiNi
Wenming Li, Weijian Tang, Maoqin Qiu, Qiuge Zhang, Muhammad Irfan, Zeheng Yang, Weixin Zhang
期刊论文
Experimental investigation on possibility of oxygen enrichment by using gradient magnetic fields
CAI Jun, WANG Li, TONG Lige, SUN Shufeng, WU Ping
期刊论文