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Microwave shock motivating the Sr substitution of 2D porous GdFeO_(3) perovskite for highly active oxygen evolution

Journal of Energy Chemistry 2024年第1期88卷 232-241,I0006页

作者： Jinglin Xian Huiyu Jiang Zhiao Wu huimin yu Kaisi Liu Miao Fan Rong Hu Guangyu Fang Liyun Wei Jingyan Cai Weilin Xu Huanyu Jin Jun Wan State Key Laboratory of New Textile Materials and Advanced Processing Technologies Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing&FinishingWuhan Textile UniversityWuhan 430200HubeiChina Future Industries Institute STEMUniversity of South AustraliaAdelaideSA 5095Australia Institute for Sustainability Energy and ResourcesThe University of AdelaideAdelaideSA 5005Australia

The incorporation of partial A-site substitution in perovskite oxides represents a promising strategy for precisely controlling the electronic configuration and enhancing its intrinsic catalytic activity.Conventional methods for A-site substitution typically involve prolonged high-temperature processes.While these processes promote the development of unique nanostructures with highly exposed active sites,they often result in the uncontrolled configuration of introduced elements.Herein,we present a novel approach for synthesizing two-dimensional(2D)porous GdFeO_(3) perovskite with A-site strontium(Sr)substitution utilizing microwave shock method.This technique enables precise control of the Sr content and simultaneous construction of 2D porous structures in one step,capitalizing on the advantages of rapid heating and cooling(temperature~1100 K,rate~70 K s^(-1)).The active sites of this oxygen-rich defect structure can be clearly revealed through the simulation of the electronic configuration and the comprehensive analysis of the crystal structure.For electrocatalytic oxygen evolution reaction application,the synthesized 2D porous Gd_(0.8)Sr_(0.2)FeO_(3) electrocatalyst exhibits an exceptional overpotential of 294 mV at a current density of 10 mA cm^(-2)and a small Tafel slope of 55.85 mV dec^(-1)in alkaline electrolytes.This study offers a fresh perspective on designing crystal configurations and the construction of nanostructures in perovskite.

关键词： 2D materials Perovskite Microwave Electrocatalysis Oxygen evolution reaction

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Microwave-assisted exploration of the electron configuration-dependent electrocatalytic urea oxidation activity of 2D porous NiCo_(2)O_(4) spinel

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Journal of Energy Chemistry 2024年第4期91卷 226-235页

作者： Jun Wan Zhiao Wu Guangyu Fang Jinglin Xian Jiao Dai Jiayue Guo Qingxiang Li Yongfei You Kaisi Liu huimin yu Weilin Xu Huiyu Jiang Minggui Xia Huanyu Jin State Key Laboratory of New Textile Materials and Advanced Processing Technologies Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing&FinishingWuhan Textile UniversityWuhan 430200HubeiChina Institute for Sustainability Energy and ResourcesThe University of AdelaideAdelaideSA 5005Australia Future Industries Institute University of South AustraliaMawson Lakes CampusAdelaideSA 5095Australia

Urea holds promise as an alternative water-oxidation substrate in electrolytic cells.High-valence nickelbased spinel,especially after heteroatom doping,excels in urea oxidation reactions(UOR).However,traditional spinel synthesis methods with prolonged high-temperature reactions lack kinetic precision,hindering the balance between controlled doping and highly active two-dimensional(2D)porous structures design.This significantly impedes the identification of electron configuration-dependent active sites in doped 2D nickel-based spinels.Herein,we present a microwave shock method for the preparation of 2D porous NiCo_(2)O_(4)spinel.Utilizing the transient on-off property of microwave pulses for precise heteroatom doping and 2D porous structural design,non-metal doping(boron,phosphorus,and sulfur)with distinct extranuclear electron disparities serves as straightforward examples for investigation.Precise tuning of lattice parameter reveals the impact of covalent bond strength on NiCo_(2)O_(4)structural stability.The introduced defect levels induce unpaired d-electrons in transition metals,enhancing the adsorption of electron-donating amino groups in urea molecules.Simultaneously,Bode plots confirm the impact mechanism of rapid electron migration caused by reduced band gaps on UOR activity.The prepared phosphorus-doped 2D porous NiCo_(2)O_(4),with optimal electron configuration control,outperforms most reported spinels.This controlled modification strategy advances understanding theoretical structure-activity mechanisms of high-performance 2D spinels in UOR.

关键词： 2D materials Spinel Microwave Electrocatalysis Urea oxidation reaction

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GAAF:Searching Activation Functions for Binary Neural Networks Through Genetic Algorithm

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Tsinghua Science and Technology 2023年第1期28卷 207-220页

作者： Yanfei Li Tong Geng Samuel Stein Ang Li huimin yu Department of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China h Pacific Northwest National Laboratory RichlandWA 99354USA

Binary neural networks(BNNs)show promising utilization in cost and power-restricted domains such as edge devices and mobile systems.This is due to its significantly less computation and storage demand,but at the cost of degraded performance.To close the accuracy gap,in this paper we propose to add a complementary activation function(AF)ahead of the sign based binarization,and rely on the genetic algorithm(GA)to automatically search for the ideal AFs.These AFs can help extract extra information from the input data in the forward pass,while allowing improved gradient approximation in the backward pass.Fifteen novel AFs are identified through our GA-based search,while most of them show improved performance(up to 2.54%on ImageNet)when testing on different datasets and network models.Interestingly,periodic functions are identified as a key component for most of the discovered AFs,which rarely exist in human designed AFs.Our method offers a novel approach for designing general and application-specific BNN architecture.GAAF will be released on GitHub.

关键词： binary neural networks(BNNs) genetic algorithm activation function

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Design of SiNridge-slot micro-ring resonator and generation of dual-comb based on orthogonally bicolor pumping

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Optoelectronics Letters 2024年

作者： Wen Jin Wang Qian yu huimin Wu Zhengwei Zhang Hui School of Science Xi'an Shiyou University Shaanxi Engineering Research Center of Oil and Gas Resource Optical Fiber Detection Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas wells

A novel high quality-factor （Q） micro-ring resonator （MRR） structure based on the Si3N4ridge-slot waveguide is proposed， and the MRR is pumped by orthogonally polarized bicolor pumping to generate dual-comb. We optimized the structure of MRR by the finite element method and precise dispersion engineering， which finally obtained the suitable MRR geometry with negative dispersion characteristics at 1550 nm， having Q of 1.7×107and the absorption loss as low as 2.6×10-5dB/cm. The simulation model of generating dual-comb is established as coupled Lugiato-Lefever equation （LLE）， which takes into account the higher order dispersion， cross-phase modulation （XPM）， multiphoton absorption， and external pumping. Solved by the split-step Fourier method （SSFM） and the fourth-order Runge-Kutta （RK4） method， the numerical results show that the generated dual-comb is periodically equally spaced distribution but with slightly different intensities in the time domain. In the frequency domain， there are 64 comb teeth with intensities higher than -100 dBm with a bandwidth of 120 nm. Particularly， in the case of bicolor orthogonal polarization pumping， a smaller amount of detuning does not greatly affect the bandwidth of the dual-comb.

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Insights into constructing a stable and efficient microbial consortium

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Chinese Journal of Chemical Engineering 2021年第2期34卷 112-120页

作者： Chunmeng Xu huimin yu Key Laboratory of Industrial Biocatalysis Ministry of EducationBeijing 100084China Department of Chemical Engineering Tsinghua UniversityBeijing 100084China Center for Synthetic and Systems Biology Tsinghua UniversityBeijing 100084China

Microbial consortia are ubiquitous in nature,in which multiple microbial species cooperate to complete some important tasks such as lignocellulose degradation.Because of the advantages such as reduced metabolic burden and robustness to environment disturbances,developing a microbial consortium is a promising approach for valuable product synthesis,lignocellulose utilization,human health care,bioremediation and sustainable energy,etc.Despite the benefits,however,most artificial microbial consortia confront the problems of instability and low efficiency due to growth competition and metabolite incompatibility.To overcome these challenges,multiple strategies to design efficient synthetic microbial consortia have been reported.In this review,the interactions that determine the stability and performance of microbial consortia were described.Progress of artificial microbial consortia research was summarized,and the key strategies i.e.,spatial or temporal segregation,separated utilization of nutrients,nutrient cross-feeding and division of labor,that will be of great importance for achieving a stable and efficient microbial consortium were highlighted.Two novel advanced tools,signaling molecule systems and computational models,were also introduced and discussed.We believed that combining the universal cell–cell signaling molecule systems with computational models will be promising for synthetic microbial consortia construction in the future.

关键词： Synthetic microbial consortia Stability Efficiency Interactions Advanced approaches Signaling molecule systems

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Plasma-induced chemical etching generating Ni_(3)S_(2) for formaldehyde detection

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Chinese Chemical Letters 2022年第6期33卷 3035-3038页

作者： Jiaxin Zhou Li Zhao Qiang Wang Lixin Zuo Ana Zhao huimin yu Xue Jiang Xiaoli Xiong College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China

In this paper,Ni_(3)S_(2)nanosheet(NS)was generated by chemical etching with sodium sulfide directly on the nickel foam(NF),which was induced by dielectric barrier discharge plasma in liquid.Compared with other chemical etching methods of nickel-based nanomaterials,this method was not only rapid(40 min)and mild(at room temperature and atmospheric pressure),but also showed consistent stability and good reproducibility.The Ni_(3)S_(2)NS/NF electrode showed excellent performance in the electrochemical detection of formaldehyde under alkaline conditions.It had a good linear relationship with the concentration of formaldehyde in the range of 0.002-5.45 mmol/L(R^(2)=0.9957)and the limit of detection(LOD)was 1.23μmol/L(S/N=3).The sensitivity was 1286.9μA L mmol^(–1)cm^(–2),and the response time was about 5 s.The plasma-induced chemical etching strategy provides a simple and stable electrode preparation method,which has great application prospects in nonenzymatic electrochemical sensors.

关键词： Chemical etching Microplasma Electrochemical detection Formaldehyde

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Topic evolution based on the probabilistic topic model： a review

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Frontiers of Computer Science 2017年第5期11卷 786-802页

作者： Houkui ZHOU huimin yu Roland HU College of Information Science & Electronic Engineering Zhejiang University Hangzhou 310027 China State Key Laboratory of CAD & CG Hangzhou 310027 China School of Information Engineering Zhejiang A&F University Hangzhou 311300 China Zhejiang Provincial Key Laboratory of Forestry Intelligent Monitoring and Information Technology Hangzhou 311300 China

Accurately representing the quantity and characteristics of users＇ interest in certain topics is an important problem facing topic evolution researchers, particularly as it applies to modem online environments. Search engines can provide information retrieval for a specified topic from archived data, but fail to reflect changes in interest toward the topic over time in a structured way. This paper reviews notable research on topic evolution based on the probabilistic topic model from multiple aspects over the past decade. First, we introduce notations, terminology, and the basic topic model explored in the survey, then we summarize three categories of topic evolution based on the probabilistic topic model： the discrete time topic evolution model, the continuous time topic evolution model, and the online topic evolution model. Next, we describe applications of the topic evolution model and attempt to summarize model generalization performance evaluation and topic evolution evaluation methods, as well as providing comparative experimental results for different models. To conclude the review, we pose some open questions and discuss possible future research directions.

关键词： topic evolution probabilistic topic models text corpora evaluation method

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Blowup of Solutions to the Non-Isentropic Compressible Euler Equations with Time-Dependent Damping and Vacuum

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Journal of Applied Mathematics and Physics 2023年第7期11卷 1881-1894页

作者： yuping Feng huimin yu Wanfang Shen Department of Mathematics Shandong Normal University Jinan China Shandong Key Laboratory of Blockchain Finance Shandong University of Finance and Economics Jinan China

This paper mainly studies the blowup phenomenon of solutions to the compressible Euler equations with general time-dependent damping for non-isentropic fluids in two and three space dimensions. When the initial data is assumed to be radially symmetric and the initial density contains vacuum, we obtain that classical solution, especially the density, will blow up on finite time. The results also reveal that damping can really delay the singularity formation.

关键词： Compressible Euler Equations Blowup General Time-Dependent Damping Vacuum

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Average iron isotopic compositions of the upper continental crust：constrained by loess from the Chinese Loess Plateau

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Acta Geochimica 2017年第2期36卷 125-131页

作者： Yingzeng Gong Ying Xia Fang Huang huimin yu CAS Key Laboratory of Crust-Mantle Material and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 Anhui China

Iron isotopic composition of the upper continental crust(UCC) is critical for understanding Fe mobilization and migration through the Earth. Because rocks exposed at Earth's surface have heterogeneous δ^(56)Fe, finegrained clastic sediments can be used to estimate the average composition of UCC. In this study, we report δ^(56)Fe of loess-paleosol sequences from Yimaguan, Chinese Loess Plateau(CLP), to constrain the average Fe isotopic composition of UCC. The loess-paleosol sequences in this area formed in glacial-interglacial cycles and are characterized by varying degrees of weathering. Our data show that the loess-paleosol layers have extremely homogeneous Fe isotopic compositions with δ^(56)Fe ranging from 0.06‰ to 0.12‰, regardless of variations in the major element composition and weathering intensity. Our study indicates that since Fe isotopes are not significantly fractionated during loess deposition, the loess can be regarded as representative of UCC. It follows that the average δ^(56)Fe of UCC is 0.09‰± 0.03‰(2SD), consistent with previous estimates based on igneous rock data.

关键词：黄土高原地区同位素组成平均黄土-古土壤序列上地壳冰期-间冰期旋回铁风化强度

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Enhancing single-cell hyaluronic acid biosynthesis by microbial morphology engineering

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Synthetic and Systems Biotechnology 2020年第4期5卷 316-323页

作者： yukun Zheng Fangyu Cheng Bo Zheng huimin yu Key Laboratory of Industrial Biocatalysis Ministry of EducationBeijing100084PR China Department of Chemical Engineering Tsinghua UniversityBeijing100084PR China Center for Synthetic and Systems Biology Tsinghua UniversityBeijing100084PR China

Microbial morphology engineering is a novel approach for cell factory to improve the titer of target product in bio-manufacture.Hyaluronic acid(HA),a valuable glycosaminoglycan polymerized by HA synthase(HAS),a membrane protein,is particularly selected as the model product to improve its single-cell HA-producing capacity via morphology engineering.DivIVA and FtsZ,the cell-elongation and cell division related protein,respectively,were both down/up dual regulated in C.glutamicum via weak promoter substitution or plasmid overexpression.Different from the natural short-rod shape,varied morphologies of engineered cells,i.***.small-ellipsoid-like(DivIVA-reduced),bulb-like(DivIVA-enhanced),long-rod(FtsZ-reduced)and dumbbell-like(FtsZ-enhanced),were observed.Applying these morphology-changed cells as hosts for HA production,the reduced expression of both DivIVA and FtsZ seriously inhibited normal cell growth;meanwhile,overexpression of DivIVA didn't show morphology changes,but overexpression of FtsZ surprisingly change the cell-shape into long and thick rod with remarkably enlarged single-cell surface area(more than 5.2-fold-increase).And finally,the single-cell HA-producing capacity of the FtsZ-overexpressed C.glutamicum was immensely improved by 13.5-folds.Flow cytometry analyses verified that the single-cell HAS amount on membrane was enhanced by 2.1 folds.This work is pretty valuable for high titer synthesis of diverse metabolic products with microbial cell factory.

关键词： Morphology engineering Single-cell HA-Producing capacity DivIVA protein FtsZ protein Down/up dual regulation Enlarged cells

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