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LONG-TIME BEHAVIOR OF FINITE DIFFERENCE SOluTIONS OF A NONLINEAR SCHRODINGER EQUATION WITH WEAKLY DAMPED

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Journal of Computational Mathematics 2001年第4期19卷 393-406页

作者： Fa-yong Zhang Shu-juan lu Department of Mathematics Heilongjiang UniversityHarbin 150080China Department of Mathematics Beijing University of Aeronautics&AstronauticsBeijing 100083China

A weakly demped Schrodinger equation possessing a global attractor are considered. The dynamical properties of a class of finite difference scheme axe analysed. The exsitence of global attractor is proved for the discrete system. The stability of the difference scheme and the error estimate of the difference solution are obtained in the autonomous system case. Finally, long-time stability and convergence of the class of finite difference scheme also are analysed in the nonautonomous system case.

关键词： global attractor nonlinear Schrodinger equation finite difference method stibility and convergence

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

The Failure Mechanism of CFRP Reinforced RC Beam under Impact Loads

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1246-1251页

作者： lu juan ZHANG Yafang School of Civil Engineering Guangzhou UniversityGuangzhou 510006China

The influence of carbon fiber reinforced plastic(CFRP)on dynamic mechanical properties of reinforced concrete(RC)beam was studied by drop hammer impact test *** impact behaviors of beam,including failure mode,impact force peak value and peak deflection were *** experimental results show that bonding CFRP can reduce the crack width and change the failure mode of the *** length of CFRP has a certain influence on the impact force and deflection,and the peak inertia force of most beams is roughly in the range of 1/2-5/6 of the peak impact *** addition,dynamic increase factor(DIF)increases with the increase of CFRP length,and its maximum value can reach 2.11.

关键词： CFRP RC beam failure mode impact resistance DIF

Overview of Rubik's Cube and Reflections on Its Application in Mechanism

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Chinese Journal of Mechanical Engineering 2018年第4期31卷 9-20页

作者： Da-Xing Zeng Ming Li juan-juan Wang Yu-Lei Hou Wen-juan lu Zhen Huang School of Mechanical Engineering Yanshan University

Rubik’s Cube is a widely popular mechanical puzzle that has attracted attention around the world because of its unique characteristics. As a classic brain-training toy well known to the public, Rubik’s Cube was used for scientific research and technology development by many scholars. This paper provides a basic understanding of the Rubik’s Cube and shows its mechanical art from the aspects of origin and development, characteristics, research status and especially its mechanical engineering design, as well as making a vision for the application in mechanism. First, the invention and origin of Rubik’s Cube are presented, and then the special characteristics of the cube itself are *** that, the present researches of Rubik’s Cube are reviewed in various disciplines at home and abroad, including the researches of Rubik’s Cube scientific metaphors, reduction algorithms, characteristic applications, and mechanism issues. Finally, the applications and prospects of Rubik’s Cube in the field of mechanism are discussed.

关键词： Rubik's Cube Scientific research Mechanical art Application and prospects

Experimental research on charging characteristics of a solar photovoltaic system by the pressure-control method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第6期12卷 470-474页

作者： Hua ZHU Zhang-lu XU Zi-juan CAO Institute of Thermal Science and Power Systems Zhejiang University Hangzhou 310027 China

The charging characteristics of the valve-regulated lead acid(VRLA) battery driven by solar energy were experimentally studied through the pressure-control method in this *** aims of the research were to increase charging efficiency to make the most of solar energy and to improve charging quality to prolong life of *** charging process of a 12 V 12 A·h VRLA battery has been tested under the mode of a stand-alone photovoltaic(PV) *** show that the pressure-control method can effectively control PV charging of the VRLA battery and make the best of PV cells through the maximum power point tracking(MPPT).The damage of VRLA battery by excess oxygen accumulation can be avoided through the inner pressure control of VRLA *** such as solar radiation intensity,charging power,inner pressure of the battery,and charging current and voltage during the charging process were measured and analyzed.

关键词： Solar photovoltaic(PV) system Charging characteristics Pressure-control method

Impact Failure of Flattened Brazilian Disc with Cracks——Process and Mechanism

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Journal of Wuhan University of Technology(Materials Science) 2020年第5期35卷 1003-1010页

作者： ZHANG Yafang LIU Hao YIN Guoqi OU Chenggui lu juan HE juan School o f Civil Engineering Guangzhou UniversityGuangzhou 510006China Shenzhen Municipal Design Research Institute Co.Ltd. Shenzhen 518029China

Split Hopkinson pressure bar(SHPB)has been used to study the dynamic failure pattern of flattened mortar Brazilian disc under impact *** disc contains several prefabricated cracks paralleled to each *** FEM has also been adopted to simulate such failure *** mechanism of crack initiation,propagation and cut-through have been scrutinized with both experimental and numerical *** of the number of the prefabricated cracks on the specimen strength and acoustic emission(AE)performance can be observed and *** results show that the strength decreases and AE counts increases,when the number of the prefabricated cracks increases.

关键词： paralleled cracks flattened brazilian disc impact load SHPB failure process acoustic emission

Crosstalk between circRNAs and the PI3K/AKT signaling pathway in cancer progression

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Signal Transduction and Targeted Therapy 2021年第12期6卷 3550-3566页

作者： Chen Xue Ganglei Li juan lu Lanjuan Li State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003China Department of Neurosurgery The First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003China

Circular RNAs(circRNAs),covalently closed noncoding RNAs,are widely expressed in eukaryotes and *** can function by regulating target gene expression,linear RNA transcription and protein *** phosphoinositide 3-kinase(PI3K)/AKT signaling pathway plays key roles in many biological and cellular processes,such as cell proliferation,growth,invasion,migration,and *** also plays a pivotal role in cancer *** data suggest that the circRNA/PI3K/AKT axis modulates the expression of cancer-associated genes and thus regulates tumor *** regulation of the expression of circRNAs in the circRNA/PI3K/AKT axis is significantly associated with clinicopathological characteristics and plays an important role in the regulation of biological *** this review,we summarized the expression and biological functions of PI3K-AKTrelated circRNAs in vitro and in vivo and assessed their associations with clinicopathological *** also further discussed the important role of circRNAs in the diagnosis,prognostication,and treatment of cancers.

关键词： PI3K/AKT cancer invasion

Possible Odderon exchange in pp and ■p elastic collisions at the TOTEM experiment

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Chinese Physics C 2020年第2期44卷 115-121页

作者： juan lu Li-juan Zhou Zhi-Jie Fang College of Science Guangxi University of Science and TechnologyLiuzhou 545006China

Based on the Froissart-Martin theorem,the Regge theory and the possible Odderon exchange,the total cross-sectionσtot and the ratio of the real to imaginary parts of the forward scattering amplitude p in the pp and pp elastic collisions in the TOTEM energy region are studied in the FPO *** consider the contributions of the Froissart bound and of the Pomeron,Reggeon and Odderon exchange terms in the scattering amplitude of the pp and pp elastic *** the Odderon interceptαo(0)=0.5,our theoretical predictions are in good agreement with the recent results of the TOTEM *** results show that the Odderon,corresponding to the odd elastic scattering amplitude,is likely to exist.

关键词： Odderon exchange unitarity the FPO model

Impact of cloud inhomogeneity on bi-directional reflectance

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Chinese Science Bulletin 2008年第1期53卷 124-130页

作者： WANG Yue lu DaRen HUO juan Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

This paper uses SHDOM (Spherical Harmonics Discrete Ordinate Method) to calculate the nadir bidi-rectional reflectance distribution function (BRDF) of the cumulus and stratocumulus fields at the wave-lengths of 0.67 μm and 2.13μm, and discusses the impact of cloud inhomogeneity on BRDF. The cloud fields are adopted from I3RC Phase II, which are used to compare 3D radiative transfer models. The simulation results show that the cu field has 6% abnormal BRDF values (BRDF>1) with the increase of solar zenith angle. Further analyses show that grid cells whose BRDF is greater than one gather to-gether at the local trough of the top of cloud. These regions can receive not only the direct incident solar beam, but also the beam scattered by the higher cloud of its neighborhood. Hence, the BRDF of those regions is enhanced. The abnormal BRDF phenomenon shows that the cloud inhomogeneity can result in inconsistency between satellite observation and plane parallel theory, implying that the re-flectance observed by high resolution satellite is maybe enhanced by the cloud 3D effects. Thus one should take this fact into account when using the product retrieved by these data. The dominant solar zenith angles are quite large in the mid-high altitude area, and the impact of cloud inhomogeneity on these areas may be more significant.

关键词：云层反射率方向分布函数