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Effects of Thickness and Polarization Field on the Photovoltaic Properties of BiFeO3 Thin Films

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Chinese Physics Letters 2014年第3期31卷 144-147页

作者： ZHOU Yin-E TAN Xin-Yu YU Ben-fang LIU Li YUAN Song-Liu jiao wei-Hong School of Physics Huazhong University of Science and Technology Wuhan 430074 College of Science China Three Gorges University Yichang 443002 Research Institute for New Energy China Three Gorges University Yichang 443002

We study the effects of film thickness on lattice parameters, direct band gap and photovoltaic outputs in the sol-gel derived BiFeO3 thin films. With the change of the film thickness, the great transitions will take place in the preferred orientation and lattice parameters. Furthermore, the photovoltaic outputs are significantly dependent on the film thickness. The results show that the open circuit voltage gradually increases and the short circuit current reciprocally decreases with the increase of film thickness. In particular, we demonstrate for the first time that there are tunable photovoltaic outputs with external electric field polarization switching in the polycrystalline BiFeO3 film, which is critical for the future device applications based on the photovoltaic properties of BiFeO3 films.

关键词： THIN films -- Research PHOTOVOLTAIC effect RESEARCH OPTICAL polarization THICKNESS measurement PHYSICS research

Biphenyls from aerial parts of Ribes takare

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Chinese Chemical Letters 2014年第1期25卷 127-130页

作者： Xiao-Zhen Chen Sheng-Ming Lu Guo-You Li wei jiao Tian-fang Huang Tao Yang Dong-Mei fang Chengdu Institute of Biology Chinese Academy of Sciences

Three new biphenyls, 4,7,8-trimethoxy-2,3-methylenedioxydibenzofuran （1）, 7-hydroxy-4,8- dimethoxy-2,3-methylenedioxydibenzofuran （2）, and 3＇,5-dimethoxy-3,4-methylenedioxybiphenyl （3）, along with eighteen known compounds （4-21） were isolated from the aerial part of Ribes takare D. Don. Their structures were elucidated on the basis of spectroscopic data. Compound I and compound 2 showed mild α-glucosidase inhibitory activity.

关键词： Biphenyl Ribes takare D. Don α-Glycosidase Inhibitory activity

An Overview of Wireless Communication Technology Using Deep Learning

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China Communications 2021年第12期18卷 1-36页

作者： Jiyu jiao Xuehong Sun Liang fang Jiafeng Lyu School of Physics and Electronic-Electrical Engineering Ningxia UniversityNingxia 750021China School of Information Engineering Ningxia UniversityNingxia 750021China

with the development of 5G,the future wireless communication network tends to be more and more *** the face of new service de-mands of communication in the future such as super-heterogeneous network,multiple communication sce-narios,large number of antenna elements and large bandwidth,new theories and technologies of intelli-gent communication have been widely studied,among which Deep Learning(DL)is a powerful technology in artificial intelligence(AI).It can be trained to con-tinuously learn to update the optimal *** paper reviews the latest research progress of DL in in-telligent communication,and emphatically introduces five scenarios including Cognitive Radio(CR),Edge Computing(EC),Channel Measurement(CM),End to end Encoder/Decoder(EED)and Visible Light Com-munication(VLC).The prospect and challenges of further research and development in the future are also discussed.

关键词： artificial intelligence wireless communi�cation deep learning cognitive radio edge comput�ing channel measurement end-to-end encoder and decoder visible light communication

Atmospheric Rivers and Mei-yu Rainfall in China:A Case Study of Summer 2020

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Advances in Atmospheric Sciences 2021年第12期38卷 2137-2152页

作者： Ting WANG Ke wei jiao MA Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

Atmospheric rivers(ARs)are long,narrow,and transient filaments of strong horizontal water vapor transport that can lead to extreme *** investigate the relationship between ARs and mei-yu rainfall in China,the mei-yu season of 2020 in the Yangtze-Huaihe River basin is taken as an *** adjusted AR-detection algorithm is applied on integrated water vapor transport(IVT)of the ERA5 *** JRA-55 reanalysis and the data from Integrated Multi-satellite Retrievals for GPM(IMERG)are also utilized to study the impacts of ARs on mei-yu rainfall in *** results reveal that ARs in East Asia have an average length of 5400 km,a width of 600 km,a length/width ratio of 9.3,and a northeastward orientation of 30°.ARs are modulated by the western North Pacific subtropical *** IVT core is located at the south side of low pressure systems,moving eastward with a speed of 10°d−*** the cross sections of ARs in the Yangtze-Huaihe River basin,75%of the total flux is concentrated below 4 km with low-level jets near AR ***,ARs occur mainly in the mei-yu period with a frequency of 20%–60%.The intensity of AR-related precipitation is 6–12 times that of AR-unrelated precipitation,and AR-related precipitation contributes about 50%–80%to total mei-yu *** shown in this case study of summer 2020,ARs are an essential part of the mei-yu system and have great impacts on mei-yu ***,ARs should receive more attention in research and weather forecast practices.

关键词： atmospheric rivers East Asian summer monsoon mei-yu front low-level jet western North Pacific subtropical high

Multi-bright-dark soliton solutions to the AB system in nonlinear optics

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Communications in Theoretical Physics 2022年第4期74卷 23-30页

作者： Yunyun Zhai Lifei wei Xianguo Geng jiao wei School of Mathematics and Statistics Zhengzhou University100 Kexue RoadZhengzhouHenan 450001China

The AB system is the basic integrable model to describe unstable baroclinic wave packets in geophysical fluids and the propagation of mesoscale gravity flows in nonlinear optics. On the basis of the spectral analysis of a Lax pair and the inverse scattering method, we establish the Riemann–Hilbert problem of the AB system. Then, the inverse problems are formulated and solved with the aid of the Riemann–Hilbert problem, from which the potentials can be reconstructed according to the asymptotic expansion of the sectional analytic function and the related symmetry relations. As an application, we obtain the multi-bright-dark soliton solutions to the AB system in the reflectionless case and discuss the dynamic behavior of elastic soliton collisions by choosing appropriate free parameters.

关键词： AB system multi-soliton structures Riemann-Hilbert problem

Serration Behavior in Zr-Cu-Al Glass-forming Systems

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Journal of Iron and Steel Research International 2016年第1期23卷 42-47页

作者： Zhong WANG jiao-jiao LI Li-wei REN Yong ZHANG Jun-wei QIAO Bao-cheng WANG Laboratory of Applied Physics and Mechanics of Advanced Materials College of Materials Science and EngineeringTaiyuan University of Technology State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

The metallic glass matrix composites（MGMCs）and bulk metallic glasses（BMGs）were studied by statistical analysis during plastic deformation at the strain rates of 2×10^-2,2×10^-3,and 2×10^-4 s^-1,*** serration events occur in both MGMCs and BMGs during compression tests at the strain rate of 2×10^-2 s^-*** deformed at the strain rate of 2×10^-3 s^-1,the BMG displays a larger plasticity,which is due to the larger serration events followed by a series of small serrations caused by the continuous movement of free *** amplitudes and elastic-energy densities increase with increasing the strain rates owing to many serrations in *** is deduced that the Young′s modulus decreases from the normalized stress drop and fluctuations are observed on stressstrain curves,which is attributed to a lower coefficient according to the stick-slip model.

关键词： bulk metallic glass metallic glass matrix composite serration shear band

Two-Level Linear Relaxation Method for Generalized Linear Fractional Programming

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Journal of the Operations Research Society of China 2023年第3期11卷 569-594页

作者： Hong-wei jiao You-Lin Shang Postdoctoral Research Base Henan Institute of Science and TechnologyXinxiang453003HenanChina Postdoctoral Research Station of Control Science and Engineering Henan University of Science and TechnologyLuoyang471023HenanChina

This paper presents an efficient algorithm for globally solving a generalized linear fractional programming *** establishing this algorithm,we firstly construct a two-level linear relaxation method,and by utilizing the method,we can convert the initial generalized linear fractional programming problem and its subproblems into a series of linear programming relaxation *** on the branch-and-bound framework and linear programming relaxation problems,a branch-and-bound algorithm is presented for globally solving the generalized linear fractional programming problem,and the computational complexity of the algorithm is ***,numerical experimental results demonstrate the feasibility and efficiency of the proposed algorithm.

关键词： Generalized linear fractional programming Global optimization Two-level linear relaxation method Branch-and-bound

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本质与价值:数字时代广告本体的再认识

武汉大学学报（哲学社会科学版） 2025年第1期78卷 125-132页

作者：姚曦任文姣武汉大学新闻与传播学院湖北武汉430072 武汉大学媒体发展研究中心

用传播的方式促进从生产到消费转换的行为皆为存在意义上的广告,广告的本体是本质与价值的统一。本体的坚守要建立开放的认识观,在不变的广告本质中解释变化着的广告形态,而非用未触及本体的不确定认识窄化新的广告事实。彰显广告价值... 详细信息

用传播的方式促进从生产到消费转换的行为皆为存在意义上的广告,广告的本体是本质与价值的统一。本体的坚守要建立开放的认识观,在不变的广告本质中解释变化着的广告形态,而非用未触及本体的不确定认识窄化新的广告事实。彰显广告价值需深耕数字广告实践,用创意提升广告的社会吸引力,建构多主体参与的沟通网络。彰显广告价值还需要在理论层面,以本体观为支点,立足于本土广告实践,重新组织数字广告研究范畴,使用大数据技术与混合研究法探究新问题,为广告学知识体系的建构提供框架与方向。

关键词：广告广告本质广告价值广告本体

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Modulating electronic structure of CoSe_(2) by Ni doping for efficient electrocatalyst for hydrogen evolution reaction

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Rare Metals 2022年第3期41卷 901-910页

作者： Xiao-jiao fang Li-Ping Ren fang Li Zai-Xing Jiang Ze-Gao Wang School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Developing robust and efficient non-noble electrocatalysts for the hydrogen evolution reaction(HER)is paramount for sustainably producing hydrogen fuel from electrochemical water *** morphology and chemical composition are significant for fabricating electrocatalysts with superior activity and ***,novel Ni-doped CoSe_(2)composites are prepared by a facile one-step hydrothermal *** optimized 1T-phase Co_(0.75)Ni_(0.25)Se_(2)shows excellent HER performance,exhibiting overpotential of as low as 172 mV at 10 mA·cm^(–2) and a small Tafel slope of 32.4 mV·dec^(–1) in 0.5 mol·L^(-1) H_(2)SO_(4)solution,approaching that of com-mercial Pt/C electrocatalyst(30.7 mV·dec^(–1)).Furthermore,the electrocatalyst possesses superior long-term stability under acidic *** measurements indicate that the homogeneous nanoparticles morphology,the unique electronic structure,and the 1T-phase are responsible for its superior HER *** work comes up with a promising strategy in synthesizing other earth-abundant and low-cost catalysts for industrial applications.

关键词： Hydrogen evolution reaction Ni-doped CoSe_(2) Electronic structure