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HIGH RESOLUTION,REAL-TIME LINE-FIELD FOURIER-DOMAIN INTERFEROMETRY

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Journal of Innovative Optical Health Sciences 2012年第2期5卷 41-48页

作者： QING XIAO ling fu Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology 1037 Luoyu Rd. Wuhan 430074P.R.China Key Laboratory of Biomedical Photonics of Ministry of Education Huazhong University of Science and Technology 1037 Luoyu Rd. Wuhan 430074P.R.China

To increase the application potential in manufacturing process,such as monitoring the processing performance,the profile measurement should be provided in real-time display and with high resolution *** propose a line-field Fourier-domain interferometric method(LFI),which combines the line-field microscope with spectral interferometer,for the surface cross-sectional profile measurement with no scan *** white light and objectives are employed to offer high axial and lateral resolution,*** our system setup,the measurement could be implemented in real-time display of 10 frame/s,and the resolutions of the LFI system in X;Y,and Z directions are~8μm,~3.2μm,and~1.4μm,*** a demonstration,the cross-sectional profiles of a microfluidic chip are *** graphics processing unit is also used to accelerate the reconstruction algorithm to achieve the real-time display of the cross-sectional profiles.

关键词： Line-field Fourier-domain interferometry cross-sectional profile real-time

Bifurcations and Chaos of a Discrete Mathematical Model for Respiratory Process in Bacterial Culture

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Acta Mathematicae Applicatae Sinica 2014年第4期30卷 871-886页

作者： Xiang-ling fu Jin DENG School of Mathematics Hunan University of Science and Technology Department of Mathematics and Physics Hunan Institute of Engineering

The discrete mathematical model for the respiratory process in bacterial culture obtained by Euler method is investigated. The conditions of existence for flip bifurcation and Hopf bifurcation are derived by using center manifold theorem and bifurcation theory, condition of existence of chaos in the sense of Marotto＇s definition of chaos is proved. The bifurcation diagrams, Lyapunov exponents and phase portraits are given for different parameters of the model, and the fractal dimension of chaotic attractor was also calculated. The numerical simulation results confirm the theoretical analysis and also display the new and complex dynamical behaviors compared with the continuous model. In particular~ we found that the new chaotic attractor, and new types of two or four coexisting chaotic attractors, and two coexisting invariant torus.

关键词： map flip bifurcation Hopf bifurcation Marotto's chaos chaos

A promising controllable CO_(2)capture and separation materials for CO_(2)/CH_(4)/H_(2)under electric field

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Chinese Chemical Letters 2023年第5期34卷 587-593页

作者： Chaozheng He Houyong Yang ling fu Shaanxi Key Laboratory of Optoelectronic functional Materials and Devices Institute of Environment and Energy CatalysisSchool of Materials Science and Chemical EngineeringXi'an Technological UniversityXi'an 710021China College of Resources and Environmental Engineering Tianshui Normal UniversityTianshui 741001China

As the greenhouse effect concerns increases,the development of new materials for the efficient capture and separation of CO_(2)gas from gas mixtures has become a matter of *** this study,we performed density functional theory(DFT)calculations to investigate the adsorption and separation behavior of CO_(2)/CH_(4)/H_(2)on the surface of two-dimensional(2D)Al_(2)C materials under positive/negative applied electric *** the absence of an electric field CO_(2)is weakly physisorbed on the Al_(2)C surface,but with the application of an applied electric field,the adsorption state of CO_(2)gradually changes from physical to chemisorption(adsorption energy changes from-0.29 e V to-3.61 e V),while the negative electric field has little effect on the adsorption of CO_(2).We conclude that the C=O bond in adsorbed CO_(2)can be activated under an external electric field(maximum activation of 15%under an external electric field of 0-0.005 a.u.).Only in the presence of an applied electric field of 0.0033 *** temperatures above525 K/675 K can the adsorption/separation reaction of CO_(2)single adsorption and CO_(2)/CH_(4)/H_(2)mixture be *** adsorption/desorption of CO_(2)on Al_(2)C nanosheet in an electric field of 0.003-0.0033 *** all exothermic,which can be easily controlled by switching on/off the electric field without any energy *** capacity of Al_(2)C to capture CO_(2)per unit electric field decreases with increasing CO_(2)concentration,but still has efficient gas separation properties for CO_(2)/CH_(4)/H_(2).Our theoretical results could provide guidance for designing high-capacity and high-selectivity CO_(2)capture materials.

关键词： CO_(2)capture Electric-field controlled CO_(2)/CH_(4)/H_(2)mixture sequestration Density functional theory Two-dimensional materials

Modelling method with missing values based on clustering and support vector regression

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Journal of Systems Engineering and Electronics 2010年第1期21卷 142-147页

作者： ling Wang Dongmei fu Qing Li Zhichun Mu Information Engineering School University of Science and Technology Beijing Beijing 100083 R R. China

Most real application processes belong to a complex nonlinear system with incomplete information. It is difficult to estimate a model by assuming that the data set is governed by a global model. Moreover, in real processes, the available data set is usually obtained with missing values. To overcome the shortcomings of global modeling and missing data values, a new modeling method is proposed. Firstly, an incomplete data set with missing values is partitioned into several clusters by a K-means with soft constraints （KSC） algorithm, which incorporates soft constraints to enable clustering with missing values. Then a local model based on each group is developed by using SVR algorithm, which adopts a missing value insensitive （MVI） kernel to investigate the missing value estimation problem. For each local model, its valid area is gotten as well. Simulation results prove the effectiveness of the current local model and the estimation algorithm.

关键词： modeling missing value K-means with soft constraints clustering missing value insensitive kernel.

Nitric oxide assists nitrogen reduction reaction on 2D MBene: A theoretical study

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Chinese Chemical Letters 2024年第5期35卷 428-433页

作者： Chaozheng He Jia Wang ling fu Wei Wei Henan Engineering Center of New Energy Battery Materials College of Chemistry and Chemical EngineeringShangqiu Normal UniversityShangqiu 476000China School of Chemistry and Chemical Engineering Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage&Novel Cell TechnologyLiaocheng UniversityLiaocheng 252059China Institute of Environment and Energy Catalysis Shaanxi Key Laboratory of Optoelectronic Functional Materials and DevicesSchool of Materials Science and Chemical EngineeringXi’an Technological UniversityXi’an 710021China College of Resources and Environmental Engineering Tianshui Normal UniversityTianshui 741001China

Electrocatalytic synthesis of ammonia as an environment-friendly and sustainable development method has received widespread attention in recent ***-dimensional(2D)materials are a promising catalyst for ammonia synthesis due to their large surface *** this work,we have constructed a series of 2D metal borides(MBenes)with transition metal(TM)defects(TMd-MBenes)and comprehensively calculated the reactivity of electrocatalytic synthesis of ammonia-based on density functional *** results have demonstrated that the TMd-MBenes can effectively activate nitrogen oxide(NO)and nitrogen(N2)molecules *** interesting,the co-chemisorption of O atoms,dissociated from NO,can facilitate the spilled of the inert N2 molecules into single N atoms,which can further hydrogenate into ammonia easily with an ultralow limiting potential of 0.59 V on *** research has not only provided clues for catalyst design for experimental study but also paved the way for the industrial application of electrocatalytic ammonia synthesis.

关键词： 2D mbenes Nitrogen electro-reduction DFT N_(2)activation Ammonia synthesis

An efficient single atom catalysts Os/P_(3)C sheet for ammonia borane dehydrogenation

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Chinese Chemical Letters 2022年第6期33卷 3281-3286页

作者： Chaozheng He Quan Zhang Jinrong Huo ling fu Shaanxi Key Laboratory of Optoelectronic functional Materials and Devices School of Materials Science and Chemical EngineeringInstitute of Environment and Energy CatalysisXi’an Technological UniversityXi’an 710021China School of Sciences Xi’an Technological UniversityXi’an 710021China College of Resources and Environmental Engineering Tianshui Normal UniversityTianshui 741001China

Ammonia borane(NH_(3)BH_(3),AB)has been considered to be a promising chemical hydrogen storage *** on density functional theory,a series of transition metal atoms supported P_(3)C(P_(3)C_O)sheet is systematically investigated to screen out the most promising catalyst for dehydrogenation of *** results indicate that the Os/P_(3)C and Os/P_(3)C_O could be an efficient single atom catalyst(SACs)and the stepwise reaction pathway with free energy barrier of 2.07 and 1.54 e V ***,the rate constant further quantitatively confirmed the real situation of the first step of dehydrogenation of AB on the Os/P_(3)C and Os/P_(3)C_O *** found that k_(f1)at 400 K is equivalent to k_(f2)at 800 K,which greatly improves the temperature of the first step of AB dehydrogenation on P_(3)C_*** hope this work can provide a promising method for the design of catalysts for AB dehydrogenation reactions on the surface of two-dimensional materials(2D).

关键词： Ammonia borane Two-dimensional materials Dehydrogenation Single atom catalyst Microkinetic model

Defect engineering for high-selection-performance of N_(2) activation over CeO_(2)(111) surface

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Chinese Chemical Letters 2022年第4期33卷 2188-2194页

作者： Fang Yuan Risheng Sun ling fu Guozheng Zhao Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of Education The School of Chemistry and Material ScienceShanxi Normal UniversityLinfen 041004China Institute of Environment and Energy Catalysis Shaanxi Key Laboratory of Optoelectronic Functional Materials and DevicesSchool of Materials Science and Chemical EngineeringXi'an Technological UniversityXi'an 710021China

Nitrogen reduction reactions(NRR) under room conditions remain the challenge for N_(2)activation on metal-based catalysis materials. Herein, the M-doped CeO_(2)(111)(M = Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn) with oxygen vacancies, are systematically investigated by spin-polarized DFT + U *** discuss briefly the situation of OVs on pure and reduced cerium, and we found that(1) doping TMs can promote the formation of oxygen defects, apart from Ti and V-dopant,(2) the O atoms are easier to escape connecting to M atoms than the ones of adjacent atoms connecting to the Ce(111), the value of OVs formation energies decrease as the TMs radius decrease. Also, our computational results show that Cr-doped, Mn-doped, Fe-doped, and Co-doped CeO_(2)(111) adsorbs N;strongly than the stoichiometric surface and other M-doped CeO_(2)surfaces with adsorption energies of-0.82,-1.02,-0.83 and-1.05 e *** COHP analysis, it is found that the predicted active sites have good catalytic performance.

关键词： Nitrogen reduction CeO_(2)(111) Defect Mechanism

Anchor single atom in h-BN assist NO synthesis NH_(3):a computational view

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Rare Metals 2022年第10期41卷 3456-3465页

作者： Chao-Zheng He Ya-Xing Zhang Jia Wang ling fu Institute of Environment and Energy Catalysis Shaanxi Key Laboratory of Optoelectronic Functional Materials and DevicesSchool of Materials Science and Chemical EngineeringXi’an Technological UniversityXi’an710021China College of Resources and Environmental Engineering Tianshui Normal UniversityTianshui741001China

Synthesis of ammonia gas through environmental protection and low-cost electrocatalysis is one of the ways to solve the current human energy ***,through the study of density functional theory(DFT),a series of transition metal single atoms are embedded in the defect-containing h-BN to construct a TM@B_(2) N_(2)(TM=Ti-Zn,Nb-Ag) two-dimensional *** activation effect of these single-atom catalysts on NO molecules and the electrochemical performance of catalyzing NO reduction reaction(NORR)were *** reaction pathways are studied in detail,and competition between hydrogen proton and ammonia(NH3) oxidation with NORRs is also *** the16 transition metal atoms we studied,the intercalation of Pb atom into h-BN has the best catalytic *** reaction rate-limiting potential of NORR is only 0.55 eV,and the surface HER reaction and ammonia oxidation can be effectively *** is hoped that our research can further promote the application of h-BN in the field of catalysis and provide some guidance for experimental workers in the field of ammonia synthesis.

关键词： Density functional theory(DFT)calculations Nitric oxide reduction reaction Electrocatalytic activity Ammonia Single-atom catalysts

A DFT study of two-dimensional P_2Si monolayer modified by single transition metal(Sc-Cu)atoms for efficient electrocatalytic CO_(2)reduction

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Chinese Chemical Letters 2023年第5期34卷 580-586页

作者： Chaozheng He Houyong Yang Xi fu Xiaoli Cheng Jiyuan Guo ling fu Institute of Environmental and Energy Catalysis Shaanxi Key Laboratory of Optoelectronic Functional Materials and DevicesSchool of Materials Science and Chemical EngineeringXi'an Technological UniversityXi'an 710021China College of Science Hunan University of Science and EngineeringYongzhou 425199China Department of Physics Jishou UniversityJishou 416000China School of Science Jiangsu University of Science and TechnologyZhenjiang 212003China College of Resources and Environmental Engineering Tianshui Normal UniversityTianshui 741001China

In the present work,a stable two-dimensional(2D)P_(2)Si monolayer was *** monolayer is semimetallic/metallic under the PBE/HSE06 functional and is mechanically *** stability of the P_(2)Si monolayer has been proved via cohesive energy,mechanical criteria,molecular dynamics simulation,and phonon dispersion respectively,and the monolayer possesses high carrier mobility which is three times that of Mo S_(2).On the other hand,the catalytic performance of the P_(2)Si monolayer modified with a single transition metals(M=Sc-Cu)atom for the electrochemical reduction of CO_(2)was investigated,and the monolayer can catalyze CO_(2)with three constraints:stable molecular dynamics,high migration potential of metal atoms,and suitable band gap for electrocatalyst after metal doping exhibiting excellent catalytic stabilization activity and CRR *** addition,the reduction product of V@P_(2)Si is HCOOH with an overpotential as low as 0.75 V,and the most suitable reaction path is^(*)CO_(2)→^(*)CHOO→O^(*)CHOH→^(*)+HCOOH with the final reduction product HCOOH *** a whole,the above results endow the P_(2)Si monolayer to be a good 2D material holding great promises for applications in nanoelectronics and CO_(2)reduction catalysts.

关键词： First-principles calculation Global optimization method CO_(2)electrochemical reduction reaction Single-atom catalysts Phosphorus silicon compound