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Chinese Journal of Chemistry 2024年第2期42卷 164-170页

作者： Jiaqing Luo Chunyu Liu Ruolin Zhang Yuanqing Sun hua Xu qingying hu Manxue Zhang Jun Li Zhenxing Li Weiyu Song Yuechang Wei Jian Liu State Key Laboratory of Heavy Oil and Bejing Key Lab of Oil&Gas Optical Detection Technology China University of PetroleumBeijing 102249China Laboratory of Heavy Oil at Karamay Ching University of Petroleum-Beijing at KaramayKaramayXinjiang 83400China Basic Research Center for Energy Interdisciplinary College of ScienceChina University of PetroleumBeijing 102249China Petrochemical Research Institute PetroChina Company LimitedBeijing 102206China BeijingNationalLaboratoryfor Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

In this study,a novel approach is proposed to achieve the uniformly dispersed Ru nanoparticles with N coordination loaded on three-dimensionally ordered macro/mesoporous carbon(3DOMMC)through simultaneous pyrolysis of Ru^(3+)and cyanamide on *** an alkaline medium,the synthesized catalysts exhibit exceptional hydrogen evolution reaction(HER)***,Ru-N/3DOMMC demonstrates a significantly low overpotential of 13.8 mV to achieve acrent density of 10 *** exhibits a mass activity 17.5 times higher than that of commercial Pt/*** outstanding performance could be attributed to the ultrahigh Ru dispersion and more efficient contact between active sites and reactant,which derived from the large specific surface area and interconnective three-dimensionally macro/mesopores of 3DOMMC.

关键词： 3DOMMC Hydrogen evolution reaction Electrocatalysis Solid-liquid contact Energy conversion

General Energy Decay of Solutions for a Wave Equation with Nonlocal Damping and Nonlinear Boundary Damping

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Journal of Partial Differential Equations 2019年第4期32卷 369-380页

作者： LI Donghao ZHANG Hongwei hu qingying Department of Mathematics Henan University of TechnologyZhengzhou 450001China

In this paper,we consider a nonlinear wave equation with nonlocal damping and nonlinear boundary *** prove a general energy decay property for solutions in terms of coefficient of the frictional boundary damping by using of the multiplier technique from the idea of Martinez[1],Our result extends and improves the result in the literature such as the work by Louredo,Ferreira de Araujo and Mi-randain[2]in which only exponential energy decay is ***,we get also the energy decay for the equation with nonlocal damping only but without nonlinear boundary damping.

关键词： Wave equation general decay nonlocal damping boundary damping.

Exponential Decay of Energy for a Logarithmic Wave Equation

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Journal of Partial Differential Equations 2015年第3期28卷 269-277页

作者： ZHANG Hongwei LIU Gongwei hu qingying Department of Mathematics Henan University of TechnologyZhengzhou 450001 China.

In this paper we consider the initial boundary value problem for a class of logarithmic wave equation. By constructing an appropriate Lyapunov function, we obtain the decay estimates of energy for the logarithmic wave... 详细信息

关键词： Logarithmic wave equation initial boundary value problem decay estimate.

A BLOW-UP RESULT FOR A CLASS DOUBLY NONLINEAR PARABOLIC EQUATIONS WITH VARIABLE-EXPONENT NONLINEARITIES

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Annals of Applied Mathematics 2019年第2期35卷 145-151页

作者： qingying hu Donghao Li Hongwei Zhang Dept.of Math. Henan University of Technology

This paper deals with the following doubly nonlinear parabolic equations(u + |u|r(x)-2u)t-div(|?u|m(x)-2?u) = |u|p(x)-2u, where the exponents of nonlinearity r(x), m(x) and p(x) are given functions. Under some appropriate assumptions on the exponents of nonlinearity, and with certain initial data, a blow-up result is established with positive initial energy.

关键词： doubly nonlinear parabolic equations variable-exponent nonlinearities blow-up

BLOW-UP OF SOLUTIONS TO ELLIPTIC EQUATIONS WITH SEMILINEAR DYNAMICAL BOUNDARY CONDITIONS OF HYPERBOLIC TYPE

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Annals of Differential Equations 2007年第4期23卷 422-426页

作者： hu qingying Zhang Hongwei Dept of Math. Itenan University of Technology Zhengzhou 450052

In this paper, we present some sufficient conditions for blow-up of solutions to elliptic equations under semilinear dynamical boundary conditions of hyperbolic type.

关键词： blow-up elliptic equation dynamical boundary condition

Analysis of Current Research and Future Development Trends of Applying Solar Energy in Street Lighting

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Journal of Electronic Research and Application 2024年第3期8卷 191-197页

作者： Liyan Zhang qingying Zhou Yueming Zhan hu Guo Chongqing Energy College Chongqing 402260China Chongqing No.94 Junior Middle School Chongqing 400080China

In the context of promoting green energy transition and addressing climate change globally,solar energy,as a clean and renewable energy source,has gradually become a hot topic for *** streetlight systems realize energy self-sufficiency and environment-friendly lighting by integrating photovoltaic power generation technology and efficient LED lighting *** comprehensively analyzing the current status of the application of solar streetlights at home and abroad,this paper discusses its technical advantages,market penetration,and challenges in its *** terms of technical characteristics,this paper focuses on analyzing the key technologies such as energy conversion efficiency and intelligent control systems of solar streetlights.

关键词： Solar streetlights Green energy Photovoltaic power generation LED lighting Intelligent control system

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一类具对数源项波动方程的初边值问题

数学物理学报（A辑） 2016年第6期36卷 1124-1136页

作者：张宏伟刘功伟呼青英河南工业大学数学系郑州450001

该文考虑一类具对数源项波动方程的初边值问题.利用Galerkin方法结合对数Sobolev不等式和对数Gronwall不等式,对所有初始值得到了整体解的存在性.通过引入位势井,给出了解在时间无穷远处爆破(即指数增长)的充分条件.当具有对数源项的波... 详细信息

该文考虑一类具对数源项波动方程的初边值问题.利用Galerkin方法结合对数Sobolev不等式和对数Gronwall不等式,对所有初始值得到了整体解的存在性.通过引入位势井,给出了解在时间无穷远处爆破(即指数增长)的充分条件.当具有对数源项的波动方程还带有线性阻尼时,通过构造适当的Lyapunov函数,得到了能量的衰减估计.

关键词：对数波动方程整体存在性指数增长衰减

基于气流脉冲和结构光成像的牛肉嫩度检测方法

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农业机械学报 2020年第12期51卷 324-331页

作者：卢伟胡庆迎代德建张澄宇 DENGYiming 南京农业大学人工智能学院南京210031 密歇根州立大学工程学院东兰辛48824

针对传统牛肉嫩度检测速度慢、精度低的问题,提出了基于气流脉冲结合结构光3D成像的牛肉嫩度快速无损检测方法。首先,利用脉冲气流对牛肉表面进行冲击,同时通过结构光3D成像获取待测牛肉表面凹陷区域的三维点云信息;然后,采用去噪、点... 详细信息

针对传统牛肉嫩度检测速度慢、精度低的问题,提出了基于气流脉冲结合结构光3D成像的牛肉嫩度快速无损检测方法。首先,利用脉冲气流对牛肉表面进行冲击,同时通过结构光3D成像获取待测牛肉表面凹陷区域的三维点云信息;然后,采用去噪、点云分割、贪婪投影三角化、Delaunay三角化、曲面拟合等算法进行点云处理,获得牛肉表面凹陷区域的深度、映射面积、表面积和体积等信息;基于此,分别建立基于最小二乘支持向量机回归(LSSVR)、BP神经网络和广义回归神经网络(GRNN)的生鲜牛肉剪切力预测模型;结果表明,GRNN模型预测表现最佳,预测集相关系数为0.975,均方根误差为5.307 N。采用基于Kfold交叉验证的GRNN神经网络对牛肉嫩度等级进行预测,结果显示该方法对较嫩牛肉分级效果较好,为100%,对较老牛肉分级效果稍差,为91.3%。研究表明,基于气流脉冲结合结构光3D成像进行牛肉剪切力以及嫩度快速、无损检测是可行的。

关键词：牛肉嫩度气流脉冲结构光无损检测

ENERGY DECAY ESTIMATES FOR AN EULER-BERNOULLI BEAM WITH A TIP MASS

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Annals of Differential Equations 2009年第2期25卷 161-164页

作者： qingying hu,Chengke Zhu (Dept. of Math.,Henan University of Technology,Zhengzhou 450001) Xiaozhong Zhang (College of Math. and Information Sci.,Henan Polytechnic University,Jiaozuo 454000,Henan) Dept. of Math. Henan University of Technology Zhengzhou 450001 College of Math. And Information Sci. Henan Polytechnic University Jiaozuo 454000 Henan

In this paper,we study the energy decay estimates for an Euler-Bernoulli beam with a tip mass,which is clamped at one end and attached a tip mass to the free end.

关键词： Euler-Bernoulli beam energy decay Nakao's inequality

具弱非线性耗散的Bresse系统解的能量衰减

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应用泛函分析学报 2016年第1期18卷 84-92页

作者：呼青英张宏伟河南工业大学理学院数学系郑州450001

本文研究了一维有界区域上三个波动方程都具有非线性阻尼的Bresse系统解的能量衰减估计.利用乘子法,通过一个加权积分不等式,证明了该Bresse系统解的能量衰减估计,这类非线性阻尼在原点有多项式增长阶,但不要求等速波传播条件.

关键词： Bresse系统能量衰减 Komornik不等式