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The Photovoltaic Properties of BiFeO_(3)La_(0.7)Sr_(0.3)MnO_(3) Heterostructures

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Chinese Physics Letters 2012年第1期29卷 276-278页

作者： LUO Bing-Cheng CHEN Chang-Le FAN Fei jin ke-xin key Laboratory of Space Applied Physics and Chemistry(Ministry of Education School of ScienceNorthwestern Polytechnical UniversityXi’an 710129

An epitaxial BiFeO_(3)/La_(0.7)Sr_(0.3)MnO_(3) (BFO/LSMO) multiferroic heterostructure is grown on an LaAlO_(3) (001) substrate by laser molecular beam epitaxy,and its photovoltaic properties are *** is found that the photocurrent is significantly increased under illumination,and the short-circuit photocurrent has a linear relationship with the laser ***,when the ferroelectric polarization of the BFO layer is switched,the short-circuit photocurrent and open-circuit voltage can be *** results are discussed by considering the contributions from the ferroelectric polarization and the electrode/film interface.

关键词： ferroelectric illumination film

The Rectifying Property and Photovoltaic Effect in the La_(0.8)Ag_(0.2)MnO_(3)/SrTiO_(3)-Nb Heterojunction

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Chinese Physics Letters 2013年第6期30卷 182-185页

作者： WANG Jian-Yuan ZHAI Wei jin ke-xin CHEN Chang-Le Department of Applied Physics Northwestern Polytechnical UniversityXi’an 710072

A p-n junction composed of Ag^(+)-doped manganite La_(0.8)Ag_(0.2)MnO_(3)(LAMO)and Nb-0.5wt%-doped SrTiO_(3)(STON)was fabricated using the pulsed laser deposition *** heterojunction exhibits a good rectifying property over a wide temperature range from 20 to 390 *** minimum diffusion potential and the lowest leakage currents under different negative voltages both occur at 320 K,which is around the metallic-insulator transition temperature of the LAMO *** photovoltage rises with the decreasing temperature and wavelength of the laser *** the illumination of a 473 nm laser beam,the photovoltage grows as the light power increases and seems to be saturated at about 300 *** maximum V_(oc) is 0.76 V,which is close to the diffusion voltage.

关键词： heterojunction laser diffusion

Stability range of tilted dendritic arrays during directional solidification

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Science China(Technological Sciences) 2014年第12期57卷 2530-2535页

作者： xinG Hui ZHAO Xiao Bin DUAN Pei Pei CHEN Chang Le CHEN Zhi jin ke xin key Laboratory of Space Applied Physics and Chemistry Shaanxi Key Laboratory for Condensed Matter Structure and Properties Northwestern Polytechnical University

The stability range of primary spacing of the tilted dendritic arrays in directional solidification has been studied by quantitative phase-field simulations. Results show that both the real growth direction and morphological shapes of dendritic arrays change with the primary spacing for different misorientation angles(θ0). It has been found that the lower limit of primary spacing is independent of θ0, but the upper limit of primary spacing is strongly influenced by that. The two kinds of tertiary branching instabilities result in different behaviors of the variation of the upper limit with misorientation angle for different pulling velocities.

关键词： directional solidification stability range titled growth phase-field model

Phase-field modeling of epitaxial growth with the Ehrlich-Schwoebel barrier: Model validation and application

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Science China(Technological Sciences) 2015年第4期58卷 753-762页

作者： DONG Xiang Lei xinG Hui SHA Sha CHEN Chang Le NIU Li Wei WANG Jian Yuan jin ke xin Shanxi key Laboratory for Condensed Matter Structure and Properties Department of Applied Physics Northwestern Polytechnical University

In this paper,we introduce different forms of mobility into a quantitative phase-field model to produce arbitrary Ehrlich-Schwoebel(ES)*** studies were carried out in the one-side step-flow model,which showed that the original mobility not only induces the ES effect,but also leads to larger numerical instability with increase of the step ***,another modified form of the ES barrier is proposed,and is found to be more suitable for large-scale *** applications were performed on the wedding-cake structure,coarsening and coalescence of islands and spiral *** results show that the ES barrier exhibits more significant kinetic effects at the larger deposition rates by limiting motions of atoms on upper steps,leading to aggregation on the top layers,as well as the roughening of growing surfaces.

关键词： epitaxial growth phase-field method Ehrlich-Schwoebel barrier kinetics interfacial

Leakage Current and Photovoltaic Properties in a Bi_(2)Fe_(4)O_(9)/Si Heterostructure

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Chinese Physics Letters 2011年第8期28卷 258-261页

作者： jin ke-xin LUO Bing-Cheng ZHAO Sheng-Gui WANG Jian-Yuan CHEN Chang-Le Shaanxi key Laboratory of Condensed Matter Structures and Properties School of ScienceNorthwestern Polytechnical UniversityXi'an 710072

A heterostructure composed of a Bi2Fe4O9 film and an n−type Si substrate is *** characteristics of leakage current density versus electric field are investigated and the leakage current density is about 6×10^(−6) A/cm^(2) at an electric field of 200 kV/cm at 300 K.A strong photovoltaic effect is observed when the heterostructure is exposed to a laser pulse with a wavelength of 532 nm and a power of 6 mW/mm^(2).It is found that the peak photovoltages initially increase with decreasing temperature,followed by a decrease at T<210 *** results reveal that the heterostructure is a promising candidate for photovoltaic devices that are compatible with Si integrated circuits.

关键词： heterostructure initially film

Love wave propagation in one-dimensional piezoelectric quasicrystal multilayered nanoplates with surface effects

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Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 619-632页

作者： xin FENG Liaoliang ke Yang GAO College of Science China Agricultural UniversityBeijing 100083China School of Mechanical Engineering Tianjin UniversityTianjin 300350China

The exact solutions for the propagation of Love waves in one-dimensional(1D)hexagonal piezoelectric quasicrystal(PQC)nanoplates with surface effects are *** electro-elastic model is developed to investigate the anti-plane strain problem of Love wave *** introducing three shape functions,the wave equations and electric balance equations are decoupled into three uncorrelated *** the boundary conditions of the top surface on the covering layer,the interlayer interface,and the matrix,a dispersive equation with the influence of multi-physical field coupling is provided.A surface PQC model is developed to investigate the surface effects on the propagation behaviors of Love waves in quasicrystal(QC)multilayered structures with nanoscale thicknesses.A novel dispersion relation for the PQC structure is derived in an explicit closed form according to the non-classical mechanical and electric boundary *** examples are given to reveal the effects of the boundary conditions,stacking sequence,characteristic scale,and phason fluctuation characteristics on the dispersion curves of Love waves propagating in PQC nanoplates with surface effects.

关键词： piezoelectric quasicrystal(PQC)material multilayered plate dispersion characteristic surface effect

Association of autoimmune thyroid disease with type 1 diabetes mellitus and its ultrasonic diagnosis and management

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World Journal of Diabetes 2024年第3期15卷 348-360页

作者： jin Wang ke Wan xin Chang Rui-Feng Mao Department of Ultrasound Medicine Nanjing Lishui People’s HospitalZhongda Hospital Lishui BranchSoutheast UniversityNanjing 211200Jiangsu ProvinceChina Faculty of Medicine and Health The University of SydneyCamperdown NSW 2050Australia School of Life Science Huaiyin Normal UniversityHuai'an 223300Jiangsu ProvinceChina

As a common hyperglycemic disease,type 1 diabetes mellitus(T1DM)is a complicated disorder that requires a lifelong insulin supply due to the immunemediated destruction of pancreaticβ*** it is an organ-specific autoimmune disorder,T1DM is often associated with multiple other autoimmune *** most prevalent concomitant autoimmune disorder occurring in T1DM is autoimmune thyroid disease(AITD),which mainly exhibits two extremes of phenotypes:hyperthyroidism[Graves'disease(GD)]and hypothyroidism[Hashimoto's thyroiditis,(HT)].However,the presence of comorbid AITD may negatively affect metabolic management in T1DM patients and thereby may increase the risk for potential diabetes-related ***,routine screening of thyroid function has been recommended when T1DM is ***,first,we summarize current knowledge regarding the etiology and pathogenesis mechanisms of both ***,an updated review of the association between T1DM and AITD is ***,we provide a relatively detailed review focusing on the application of thyroid ultrasonography in diagnosing and managing HT and GD,suggesting its critical role in the timely and accurate diagnosis of AITD in T1DM.

关键词： Type 1 diabetes mellitus Autoimmunity Autoimmune thyroid disease Ultrasonography Diagnosis

Strong Edge Coloring of Outerplane Graphs with Independent Crossings

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 467-477页

作者： ke-Jie LI xin ZHANG School of Mathematics and Statistics Xidian UniversityXi’an 710071China

The strong chromatic index of a graph is the minimum number of colors needed in a proper edge coloring so that no edge is adjacent to two edges of the same *** outerplane graph with independent crossings is a graph embedded in the plane in such a way that all vertices are on the outer face and two pairs of crossing edges share no common end *** is proved that every outerplane graph with independent crossings and maximum degreeΔhas strong chromatic index at most 4Δ-6 if Δ≥4,and at most 8 ifΔ≤*** bounds are sharp.

关键词： outer-1-planar graph IC-planar graph strong edge coloring crossing

Incidence Coloring of Outer-1-planar Graphs

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Acta Mathematicae Applicatae Sinica 2024年第3期40卷 840-848页

作者： Meng-ke QI xin ZHANG School of Mathematics and Statistics Xidian UniversityXi'an 710071China

A graph is outer-1-planar if it can be drawn in the plane so that all vertices lie on the outer-face and each edge crosses at most one another *** is known that every outer-1-planar graph is a planar *** this paper,we conjecture that every planar graph G has a proper incidence(Δ(G)+2)-coloring and confirm it for outer-1-planar graphs with maximum degree at least 8 or with girth at least ***,we prove that every outer-1-planar graph G has an incidence(Δ(G)+3,2)-coloring,and every outer-1-planar graph G with maximum degree at least 8 or with girth at least 4 has an incidence(Δ(G)+2,2)-coloring.

关键词： incidence coloring outer--planar graph planar graph