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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

Research on Low-frequency Multi-directional Piezoelectric Energy Harvester with Combined Cantilever Beam

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Chinese Journal of Electronics 2024年

作者： qingying REN Yuxuan LIU Debo WANG College of Electronic and Optical Engineering Nanjing University of Posts and Telecommunications College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications

In order to realize the collection and utilization of low-frequency vibration energy, a multi-directional piezoelectric energy harvester is proposed, which consists of a lower circular arc beam and an upper L-shaped *** the lower and upper beams can achieve multi-directional energy harvesting, and the upper L-shaped beam can also act as a mass block to reduce the resonant frequency. The structure of this energy harvester is optimized. Four different structures are studied with varying combination angles between the upper and lower layers to acquire data related to resonant frequency, vibration shape, stress distribution, open-circuit voltage, and output power. Additionally, the performance of each structure is comprehensively prepared and measured to verify its effectiveness. The optimal structure achieved a resonant frequency of 11 Hz and an output power of 57.1 μW at the optimal load resistance of 201 kΩ. Consequently, this work provides valuable reference for the study of low-frequency vibration energy harvesting technology.

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Magnetic Field Controllable Photocurrent Properties in BiFe_(0.9)Ni_(0.1)O_(3)/La_(0.7)Sr_(0.3)MnO_(3) Laminate Thin Film

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Energy & Environmental Materials 2024年第2期7卷 381-388页

作者： Guanzhong huo Ke Wang qingying Ye Shuiyuan Chen Chao Su Yuxiang Zhang Guilin Chen Zhigao huang Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage Fuzhou 350117China

This paper reports a multifunctional magnetic-photoelectric laminate device based on the integration of spintronic material(La_(0.7)Sr_(0.3)MnO_(3))and multiferroic(Ni-doped BiFeO_(3)),in which the repeatable modulation effect on the photoelectric properties were achieved by applying external magnetic *** obviously,photocurrent density(J)of the laminate was largely enhanced,the change rate of J up to 287.6%is *** sensing function effect should be attributed to the low-field magnetoresistance effect in perovskite manganite and the scattering of spin photoelectron in multiferroic *** laminate perfectly combines the functions of sensor and controller,which can not only reflect the intensity of environmental magnetic field,but also modulate the photoelectric conversion *** work provides an alternative and facile way to realize multi-degree-of-freedom control for photoelectric conversion performances and lastly miniaturize multifunction device.

关键词： bismuth ferrite low-field magnetoresistance effect magnetic field modulation perovskite manganite photocurrent

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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

Comparative analysis of four edible mushrooms based on HPLC fingerprint and pattein recognition analysis

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未来食品学报(英文) 2024年第1期4卷 105-110页

作者： Xiali Si Xinyu Liu Shuangyu Shao Zhiyong Du Pengfei Tu qingying Zhang Strate Key Laboratory of Natoral oud Biomimenic Drugs and Deportment of Natral Menicines School of Phormocutical ScimncesPekang Uravensin Heath Science CenterBeijing 100191China

A high performance liquid chromatography-ultraviolet(HPLC-UV)fingerprint method for the overall chemical analysis of edible mushrooms was established based on Auricularia heimuer for the first time,and then applied to analyze 60 batches of ***,Auricularia *** cornea*Yu Muer’and TremeUa fuciformis.A total of 9 characteristic peaks of ***.11 characteristic peaks of ***,6 characteristic peaks of ***‘Yu Muer’,and 9 characteristic peaks of I fuciformis were ***,a combinatory analysis,including similarity evaluation,hierarchical cluster analysis and principal component analysis,revealed the chemical consistency and difference between samples from the same and different *** HPLC fingerprint method established in this paper could be used to characterize the components of ***,***,***‘Yu Muer’,and *** and discriminate the 4 edible mushrooms effectively in combination with pattern recognition analysis.

关键词： Edible mushrooms High performance liquid chromatography fingerprint Pattern recognition analysis Auricularia heimuer Auricularia cornea Tremella fiiciformis