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Shedding light on the role of interfacial chemical bond in heterojunction photocatalysis

Nano Research 2022年第12期15卷 10158-10170页

作者： Yueshuang Mao Pengfei Wang Sihui zhan MOE Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin300350China Tianjin Key Lab Clean Energy&Pollutant Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin300401China

Faced with the growing consumption of fossil fuels and the consequent energy/ecological crisis,photocatalysis has become a realistic option to develop new energy source and realize the carbon *** photocatalysts constructed by multiple semiconductors with staggered band structure can spatially separate redox reaction sites to realize synergistic oxidation and reduction reactions,and have captured broad ***,the undesigned heterojunctions still encounter some headache difficulties,that is the poor interfacial contact,which will block carrier mobility,thus result in inefficient and instable ***,researchers have been focusing on constructing chemical bonds(especially covalent bonding)between different semiconductors to induce the formation of intimate and stable interface ***,this review article presents the state-of-the-art progress on interfacial chemical bonds(ICB)in heterojunction photocatalysts and clarifies the function mechanism for enhancing *** that the formation of ICB strongly depends on the surface characteristics of semiconductors,we clarify the formation mechanism and put forward rational design *** importantly,the current photocatalytic applications of ICB are reviewed to have a deep understanding of structure-activity related ***,our brief outlooks on the current challenges and future development trends of ICB for next-generation photocatalysts are pointed out to create brand-new strategies for optimizing photocatalytic properties and accelerate the practical applications of ICB with high-performance.

关键词： photocatalysis heterojunction interfacial chemical bond structure-activity relationships charge transfer

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Detection of two pathogenic marine ciliates Ancistrum haliotis and A. crassum(Ciliophora: Scuticociliatia) by fluorescence in situ hybridization

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Acta Oceanologica Sinica 2020年第12期39卷 90-94页

作者： Zifeng zhan Kuidong Xu Laboratory of Marine Organism Taxonomy and Phylogeny Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

The scuticociliatid ciliates Ancistrum haliotis and *** are parasites that may cause high mortality in the cultured abalone Haliotis *** the bivalve Ruditapes *** identification with silver staining methods is hampered by their morphological similarities to closely related species and the complicated procedures of morphological *** designed two SSU rRNA-targeted oligonucleotide probes labeled with a fluorochrome,and optimized the fluorescence in situ hybridization(FISH)protocols for identification of *** and ***,*** assays resulted in a clear identification by strong fluorescence signals from the oligonucleotide *** method can be used for quick and accurate quantitative analysis of *** and *** infections on host molluscs.

关键词： oligonucleotide probes molecular methods scuticociliates SSU rRNA abalone mollusc

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A comb-gate silicon tunneling field effect transistor with improved on-state current

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Science China(Information Sciences) 2013年第7期56卷 130-135页

作者： zhan zhan HUANG QianQian HUANG Ru JIANG WenZhe WANG YangYuan Institute of Microelectronics Peking University

In this paper, a new tunneling field effect transistor with comb-shaped gate (CG-TFET) is proposed and experimentally demonstrated. Source implantation masked by the comb-shaped gate can result in combshaped channel region. With this comb-shaped gate configuration, increased tunneling area can be obtained and hence higher on-state current without area penalty. Moreover, an optimized CG-TFET with silicide source is fabricated to further improve the on-state current by introducing Schottky barrier tunneling current which is much more efficient than band-to-band tunneling. In addition, the electron barrier in the comb-shaped channel region is raised due to the self depleted effect, which can effectively suppress the Schottky injection leakage from the silicide source in the off-state. 1.5 orders of magnitude higher than conventional TFET with the same footprint on-state current and more than 106 on-off current ratio can be achieved.

关键词： tunneling transistor on-state current comb-gate

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On the Well-Posedness Problem of the Anisotropic Porous Medium Equation with a Variable Diffusion Coefficient

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Journal of Partial Differential Equations 2024年第2期37卷 135-149页

作者： zhan Huashui School of Mathematics and Statistics Xiamen University of TechnologyXiamen 361024China

The initial-boundary value problem of an anisotropic porous medium equation■is *** with the usual porous medium equation,there are two different characteristics in this *** lies in its anisotropic property,another one is that there is a nonnegative variable diffusion coefficient a(x,t)*** a(x,t)may be degenerate on the parabolic boundary∂Ω×(0,T),instead of the boundedness of the gradient|∇u|for the usual porous medium,we can only show that∇u∈L^(∞)(0,T;L^(2)_(loc)(Ω)).Based on this property,the partial boundary value conditions matching up with the anisotropic porous medium equation are discovered and two stability theorems of weak solutions can be proved naturally.

关键词： Anisotropic porous medium equation variable diffusion coefficient stability partial boundary condition

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Automated Stellar Classification for Large Surveys with EKF and RBF Neural Networks

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Chinese Journal of Astronomy and Astrophysics 2005年第2期5卷 203-210页

作者： LingBai PingGuo zhan-YiHu DepartmentofComputerScience BeijingNormalUniversityBeijing100875／／NationalLaboratoryofPatternRecognitionInstituteofAutomationChineseAcademyofSciencesBeijing100080 DepartmentofComputerScience BeijingNormalUniversityBeijing100875 NationalLaboratoryofPatternRecognition InstituteofAutomationChineseAcademyofSciencesBeijing100080

An automated classification technique for large size stellar surveys is proposed. It uses the extended Kalman filter as a feature selector and pre-classifier of the data, and the radial basis function neural networks for the classification. Experiments with real data have shown that the correct classification rate can reach as high as 93%, which is quite satisfactory. When different system models are selected for the extended Kalman filter, the classification results are relatively stable. It is shown that for this particular case the result using extended Kalman filter is better than using principal component analysis.

关键词： methods: data analysis - techniques: spectroscopic - stars: general- galaxies: stellar content

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Optimal hardware/software co-synthesis for core-based SoC desi gns

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Journal of Systems Engineering and Electronics 2006年第2期17卷 402-409页

作者： zhan Jinyu Xiong Guangze Coll. of Computer Science and Engineering Univ. of Electronic Science and Technology of China Chengdu 610054 P.R. China

A hardware/software co-synthesis method is presented for SoC designs consisting of both hardware IP cores and software components on a graph-theoretic formulation. Given a SoC integrated with a set of functions and a set of performance factors, a core for each function is selected from a set of alternative IP cores and software components, and optimal partitions is found in a way to evenly balance the performance factors and to ultimately reduce the overall cost, size, power consumption and runtime of the core-based SoC. The algorithm formulates IP cores and components into the corresponding mathematical models, presents a graph-theoretic model for finding the optimal partitions of SoC design and transforms SoC hardware/software co-synthesis problem into finding optimal paths in a weighted, directed graph. Overcoming the three main deficiencies of the traditional methods, this method can work automatically, evaluate more performance factors at the same time and meet the particularity of SoC designs. At last, the approach is illustrated that is practical and effective through partitioning a practical system.

关键词： SoC co-synthesis partition IP core software component optimal path.

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A universal bifurcation mechanism arising from progressive hydroelastic waves

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Theoretical & Applied Mechanics Letters 2022年第1期12卷 23-29页

作者： zhan Wang Institute of Mechanics Chinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

A unidirectional, weakly dispersive nonlinear model is proposed to describe the supercritical bifurcation arising from hydroelastic waves in deep water. This model equation, including quadratic, cubic, and quartic nonlinearities, is an extension of the famous Whitham equation. The coefficients of the nonlinear terms are chosen to match with the key properties of the full Euler equations, precisely, the associated cubic nonlinear Schrödinger equation and the amplitude of the solitary wave at the bifurcation point. It is shown that the supercritical bifurcation, rich with Stokes, solitary, generalized solitary, and dark solitary waves in the vicinity of the phase speed minimum, is a universal bifurcation mechanism. The newly developed model can capture the essential features near the bifurcation point and easily be generalized to other nonlinear wave problems in hydrodynamics.

关键词： Nonlinear wave Supercritical bifurcation Hydroelastic wave Wavepacket

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Robust topology optimization of hinge-free compliant mechanisms with material uncertainties based on a non-probabilistic field model

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Frontiers of Mechanical Engineering 2019年第2期14卷 201-212页

作者： Junjie zhan Yangjun LUO State Key Laboratory of Structural Analysis for Industrial Equipment School of Aeronautics and AstronauticsDalian University of TechnologyDalian 116024China

This paper presents a new robust topology optimization framework for hinge-free compliant mechanisms with spatially varying material uncertainties,which are described using a non-probabilistic bounded field *** field uncertainties are efficiently represented by a reduced set of uncertain-but-bouncled coeflficients on the basis of the series expansion *** topology optimization of compliant mechanisms is then defined to minimize the variation in output displacement under constraints of the mean displacement and predefined material *** nest optimization problem is solved using a gradient-based optimization *** examples are presented to illustrate the effectiveness of the proposed method for circumventing hinges in topology optimization of compliant mechanisms.

关键词： compliant mechanisms robust topology optimization hinges uncertainty bounded field

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Functional regulation of monocyte-derived dendritic cells by microRNAs

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Protein & Cell 2012年第7期3卷 497-507页

作者： Yifan zhan Li Wu The Walter and Eliza Hall Institute of Medical Research Parkville 3052Australia Department of Medical Biology University of MelbourneParkville 3010Australia Tsignhua University and Peking University Joint Center for Life Sciences and Tsinghua University School of Medicine Beijing 100084China

Dendritic cells(DCs)as a rare type of leukocytes play an important role in bridging the innate and adaptive immune system.A subset of DCs,monocyte-derived dendritic cells(moDCs),exists in very low numbers at steady state but become abundant in inflammatory *** inflammation-associated DCs are potent producers of pro-inflammatory cytokines and potent inducers of T helper *** behave as a“double-edge”sword so that they not only mediate protective immunity but also *** is still incompletely understood how their function is *** evidence indicates that microR-NAs(miRNAs),as a new class of gene regulators,potently regulate the function of *** we summarize recent progress in this area.

关键词： dendritic cells microRNA function

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Classic and Quantum Motions of Scalar Particle in Beltrami-de Sitter Spacetime

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Communications in Theoretical Physics 2008年第4期49卷 933-940页

作者： WANG Bo XU zhan Department of Physics Tsinghua University Beijing 100084 China Department of Physics and Center for Advanced Study Tsinghua University Beijing 100084 China

From a five-dimensional Minkowski view the five-dimensional angular momentum of a free spin-O particle moving in de Sifter spacefime is conservative, by which its fimelike geodesics can be labeled completely and uniquely. Based on that observation and working in Belframi coordinate for de Sifter spacefime, solutions and their asymptotic behavior to the Belframi-de Sifter-Klein-Gordon equation are given.

关键词： de Sitter spacetime timelike geodesics Beltrami coordinate

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