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The effect of complexing agent on crystal growth, structure and properties of nanostructured Cu_(2-x)S thin films

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Chinese Chemical Letters 2014年第11期25卷 1473-1478页

作者： Yong-Juan Lu jun-hong Jia The School of Chemical Engineering The Northwest University for Nationalities State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences

Thin films of Cu2 x S（x = 0, 1） were deposited on self-assembled, monolayer modified substrates in the copper–thiosulfate system with various concentrations of ethylene diamine tetraacetic acid（EDTA） at a low temperature of 70 8C. The thin films were characterized by means of X-ray diffraction（XRD）, X-ray photoelectron spectroscope（XPS）, field emission scanning electron microscopy（FESEM）, transmission electron microscopy（TEM）. The optical and photoelectrochemical（PEC） properties of the Cu2 x S semiconductor films were investigated by ultraviolet–visible（UV–vis） absorption spectroscopy and a three-electrode system. It is found that EDTA plays a key role in the process of Cu2 x S nanocrystals formation and growth. The compositions of the Cu2 x S nanocrystals varied from Cu2S（chalcocide） to Cu S（covellite） through adjusting the concentration of EDTA, which is used as a complexing agent to yield high-quality Cu2 x S films. The growth mechanisms of Cu2 x S nanocrystals with different EDTA concentrations are proposed and discussed in detail.

关键词： Thin film Chemical synthesis Optical properties Photoelectrochemical properties

Expression and Purification of Recombinant MP-GFP Protein in Escherichia coli

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Agricultural Sciences in China 2011年第3期10卷 394-403页

作者： CHEN Xiao-jun XU Han-hong Key Laboratory of Natural Pesticide and Chemical Biology Ministry of Education~South China Agricultural University Guangzhou510642 P.R.China School of Horticulture and Plant Protection Yangzhou University Yangzhou 225009 P..R. China

Guided pesticide is an unique compound resulted from the conjugation with carrier （amino acid, protein, sugars, etc） and the active pesticide ingredient. One of the attributes of the guided pesticide is its potential to accumulate at the site of the damaged points caused by pest or at the site of entry to the target pests, such as via inhalation, cuticular penetration, and oral digestion. Movement protein （MP） is a kind of protein coded by plant virus. A genetic fusion between green fluorescent protein （GFP） and movement protein resulted in the expression of a fluorescent fusion MP-GFP protein, which was fully biologically active in mediating the cell-to-cell spread of virus. In order to obtain a suitable carrier for a pesticide, fluorescent carrier MP-GFP was constructed. It was found that the recombinant MP-GFP protein was the inclusion body. The results indicated that optimized cultural condition for expression of recombinant MP-GFP protein was incubation at 37°C for 2 h and induction with 0.2 mmol L-1 IPTG （isopropyl-b-dthiogalactopyranoside） at 25°C for 4 h. MP-GFP protein was purified by using Ni-NTA resin. The expressed recombinant MP-GFP protein had both the fluorescence character of report GFP gene and moving character of movement protein. It could provide a guided carrier for studying the guided pesticide. It could also provide convenience for studying the delivery and distribution of the guided pesticide ingredients in the plant.

关键词： movement protein green fluorescent protein purification

New Matrix Lie Algebra, a Powerful Tool for Constructing Multi-component C-KdV Equation Hierarchy

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Communications in Theoretical Physics 2006年第4期45卷 587-592页

作者： YU Fa-jun ZHANG hong-Qing Department of Applied Mathematics Dalian University of Technology Dalian 116024 China

A set of new multi-component matrix Lie algebra is constructed, which is devoted to obtaining a new loop algebra A^-2M. It follows that an isospectral problem is established. By making use of Tu scheme, a Liouville integrable multi-component hicrarchy of soliton equations is generated, which possesses the *** Hamiltonian structures. As its reduction cases, the multi-component C-KdV hierarchy is given. Finally, the *** integrable coupling system of C-KdV hierarchy is presented through enlarging matrix spectral problem.

关键词： matrix Lie algebra Liouville integrable integrable coupling

Nonlinear Instability of Phillips Model

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Acta Mathematicae Applicatae Sinica 2016年第3期32卷 669-684页

作者： Rong-fang WANG hong-jun GAO Jiangsu Provincial Key Laboratory for Numerical Simulation of Large Scale Complex Systems School of Mathematical Sciences Nanjing Normal University Institution of Mathematics Jilin University

We investigate the instability of two-layer Phillips model in this paper, which is a prototypical geophysical fluid model. Using the results of Guo and Strauss et al, we obtained linear instability implies nonlinear i... 详细信息

关键词： nonlinear instability Lyapunov exponent Phillips model

Improved Staggered Algorithm for Phase-Field Brittle Fracture with the Local Arc-Length Method

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Computer Modeling in Engineering & Sciences 2023年第1期134卷 611-636页

作者： Zhijian Wu Li Guo jun hong Jiangsu Key Laboratory of Engineering Mechanics Department of Engineering MechanicsSchool of Civil EngineeringSoutheast UniversityNanjing214135China

The local arc-length method is employed to control the incremental loading procedure for phase-field brittle fracture *** improved staggered algorithm with energy and damage iterative tolerance convergence criteria is developed based on the residuals of displacement and *** improved staggered solution scheme is implemented in the commercial software ABAQUS with user-defined element *** layered system of finite elements is utilized to solve the coupled elastic displacement and phase-field fracture problem.A one-element benchmark test compared with the analytical solution was conducted to validate the feasibility and accuracy of the developed *** study shows that the result calculated with the developed method does not depend on the selected size of loading *** results of several numerical experiments show that the improved staggered algorithm is efficient for solving the more complex brittle fracture problems.

关键词： Phase-field model brittle fracture crack propagation ABAQUS subroutine staggered algorithm

Applications of electrohydrodynamics and Joule heating effects in microfluidic chips:A review

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Science China(Technological Sciences) 2009年第12期52卷 3477-3490页

作者： CAO jun CHENG Ping hong Fangjun Ministry of Education Key Laboratory of Power and Machinery Shanghai Jiao Tong UniversityShanghai 200240China

This review article presents an overview on the application of electrohydrodynamics and Joule heating effects in microfluidic chips.A brief introduction of microfluidic chips and a classification of electrohydrodynamics as well as the applications in microfluidic devices are first *** basic theories and governing equations of classical electromagnetics are summarized and electroviscous effects in pressure driven flows in a microchannel are *** and applications of DC electrokinetics,including DC electroosmotic flow,DC electrophoresis,as well as principles of AC electrokinetics,including AC electroosmotic flow and dielectrophoresis are also ***,Joule heating effects in both DC and AC electrokinetics,especially the newly discovered electrothermal flow,are summaried.

关键词： electrohydrodynamics microfluidics electrokinetics Joule heating effect AC electroosmosis dielectrophoresis electrothermal flow

N-doped carbon nanocube with zinc oxide sodiophilic sites enables a superior sodium metal anode

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Nano Research 2023年第1期16卷 411-419页

作者： Yijuan Li Pan Xu hongbin Ni Jirong mou Tangchao Xie hong Xiao Hengji Zhu Quanfeng Dong Shaoming Huang Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China State Key Laboratory for Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)Engineering Research Centre of Electrochemical Technologies of Ministry of EducationXiamen UniversityXiamen 361005China School of Environment and Energy South China University of TechnologyGuangzhou 510006China

The metallic Na has been regarded as the most promising anode for next-generation sodium metal batteries(SMBs)owing to its high theoretical specific capacity,low redox potential,and low *** practical applications of Na metal,however,have still been severely hindered by the uncontrolled sodium dendrites growth during Na deposition and stripping processes,which leads to low Coulombic efficiency and poor cycling *** this study,sub-nano zinc oxide(ZnO)uniformly dispersed in threedimensional(3D)porous nitrogen-doped(N-doped)carbon nanocube(ZnO@NC)was acquired as a stable host for dendrite-free Na metal *** from the in-situ electrochemically formed sodiophilic nucleation site(NaZn13 alloy)and the enriched pore structure,rapid and uniform sodium deposition behavior can be *** expected,the ZnO@NC electrode delivers impressive electrochemical performance,an ultra-high areal capacity of 20 mAh·cm−2 in the half-cell can be maintained for 2,000 *** the symmetrical-cell,it can also exhibit up to 3,000 h at 3 mA·cm−2 and 3 mAh·cm−2 with low polarization ***,in the full-cell that matches with Prussian blue(PB)cathode,the Na@ZnO@NC anode performs the outstanding long-cycling and rate ***,this work provides an effective strategy to inhibit the growth of Na dendrites for the development of high-safety and long-cycling SMBs.

关键词： sub-nano zinc oxide N-doped carbon nanocube sodiophilic site NaZn13 alloy dendrite-free Na metal anode

Construction of nonseparable orthonormal compactly supported wavelet bases for L^2(R^d)

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Applied Mathematics(A Journal of Chinese Universities) 2012年第2期27卷 205-224页

作者： YANG Shou-zhi LIN jun-hong Department of Mathematics Shantou UniversityShantou 515063China

Suppose M and N are two r×r and s×s dilation matrices,***ΓM andΓN represent the complete sets of representatives of distinct cosets of the quotient groups M-T Zr/Zr and N-T Zs/Zs,*** methods for constructing nonseparable Ω-filter banks from M-filter banks and N-filter banks are presented,where Ω is a（r＋s） ×（r＋s） dilation matrix such that one of its complete sets of representatives of distinct cosets of the quotient groups Ω-T Zr＋s/Zr＋s areΓΩ={[γT h,ζ T q] T：γh∈ΓM,ζq∈ΓN}.Specially,Ω can be [MΘ0N],whereΘis a r×s integer matrix with M-1Θbeing also an integer ***,if the constructed filter bank satisfies Lawton＇s condition,which can be easy to verify,then it generates an orthonormal nonseparable Ω-wavelet basis for L2（Rr＋s）.Properties,including Lawton＇s condition,vanishing moments and regularity of the new Ω-filter banks or new Ω-wavelet basis are discussed ***,a class of nonseparable Ω-wavelet basis for L2（Rr＋1） are constructed and three other examples are given to illustrate the *** particular,when M=N=2,all results obtained in this paper appeared in[1].

关键词： filter bank nonseparable orthonormal wavelet basis Lawton's condition vanishing moment regularity.

On the core of the fractional Fourier transform and its role in composing complex fractional Fourier transformations and Fresnel transformations

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Frontiers of physics 2015年第1期10卷 1-6页

作者： hong-Yi Fan jun-Hua Chen Department of Physics Ningbo University Ningbo 315211 China Department of Material Science and Engineering University of Science and Technology of China Hefei 230026 China

By a quantum mechanical analysis of the additive rule Fa [Fβ[f]] = Fα＋β[f], which the fractional Fourier transformation （FrFT） Fα [f] should satisfy, we reveal that the position-momentum mutual- transformation operator is the core element for constructing the integration kernel of FrFT. Based on this observation and the two mutually conjugate entangled-state representations, we then derive a core operator for enabling a complex fractional Fourier transformation （CFrFT）, which also obeys the additive rule. In a similar manner, we also reveal the fractional transformation property for a type of Fresnel operator.

关键词： fractional Fourier transform core operator IWOP technique entangled state of con-tinuum variables Fresnel operator