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Classification and Reduction of Generalized Thin Film Equations

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Communications in Theoretical Physics 2009年第9期52卷 403-410页

作者： ZHU Chun-rong QU Chang-zheng Center for Nonlinear Studies Northwest University Xi＇an 710069 China College of Mathematics and Computer Science Anhui Normal University Wuhu 241000 China Department of Mathematics Northwest University Xi＇an 710069 China

Classification and reduction of the generalized fourth-order nonlinear differential equations arising from theliquid films are *** is shown that these equations have solutions on subspaces of the polynomial,exponential ortrigonometric form defined by linear nth-order ordinary differential equations with constant coefficients for n=4,...,*** examples of exact solutions are presented.

关键词： thin film equation classification invariant subspaces exact solutions

Potential Symmetries to a System of Three-Component Nonlinear Diffusion Equations

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Communications in Theoretical Physics 2006年第2期45卷 193-198页

作者： XUE Chun-rong QU Chang-zheng Center for Nonlinear Studies Northwest University Xi＇an 710069 China Department of Mathematics Northwest University Xi＇an 710069 China

A system of nonlinear diffusion equations with three components is studied via the potential symmetry method. It is shown that the system admits the potential symmetries for certain diffusion terms. The invariant solu... 详细信息

关键词： Lie point symmetry potential symmetry nonlinear diffusion equation group-invariant solutions

Identification of MicroRNAs in Wild Soybean (Glycine soja)

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Journal of Integrative Plant Biology 2009年第12期51卷 1071-1079页

作者： rui Chen zheng Hu Hui Zhang The National Key Facilities for Crop Genetic Resources and Improvement Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing 100081 China

MicroRNAs （miRNAs） play important roles in post-transcriptional gene silencing by directing target mRNA cleavage or translational inhibition. Currently, hundreds of miRNAs have been identified in plants, but no report has been published of wild soybean （Glycine soja Sieb）. We constructed a small-RNA library consisting of 2 880 sequences with high quality, in which 1 347 were 19-24 nt in length. By utilizing the miRNA, Rfam and domesticated soybean expressed sequence tag database, we have analyzed and predicted the secondary structure of these small RNAs. As a result, t5 conserved miRNA candidates belonging to eight different families and nine novel miRNA candidates comprising eight families were identified in wild soybean seedlings. All these miRNA candidates were validated by northern blot and the novel candidates expressed in a tissue-specific manner. Furthermore, putative target genes were predicted for novel miRNA candidates and two of them were verified by 5＇-rapid amplification of cDNA ends experiments. These results provided useful information for miRNA research in wild soybean and plants.

关键词： microRNAs plants wild soybean.

Asymptotic Estimates to Non-global Solutions of a Multi-coupled Parabolic System

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Acta Mathematica Sinica,English Series 2008年第10期24卷 1713-1726页

作者： rui Hong JI Si Ning zheng Department of Applied Mathematics Dalian University of Technology Dalian 116024 P. R. China

This paper deals with asymptotic behavior of solutions to a parabolic system, where two heat equations with inner absorptions are multi-coupled via inner sources and boundary flux. We determine four kinds of simultaneous blow-up rates under different dominations of nonlinearities in the model. Two characteristic algebraic systems associated with the problem are introduced to get very simple descriptions for the four simultaneous blow-up rates as well as the known critical exponents, respectively. It is observed that the blow-up rates are independent of the nonlinear inner absorptions.

关键词： simultaneous blow-up rates asymptotic estimates characteristic algebraic system multicoupled parabolic system non-global solution critical exponent

Protective effects of two food hydrocolloids on dental erosion:Nanomechanical properties and microtribological behavior study

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Friction 2021年第2期9卷 356-366页

作者： Heng XIAO Liang zheng Wei HAN rui WU Jing zheng Zhongrong ZHOU Tribology Research Institute Key Laboratory of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong UniversityChengdu 610031China Institute of Oceanographic Instrumentation Shandong Provincial Key Laboratory of Marine Monitoring Instrument and Equipment TechnologyQilu University of Technology(Shandong Academy of Sciences)Qingdao 266061China

In this study,the protective effects of two food hydrocolloids,Xanthan gum and Arabic gum,on dental erosion are investigated from the perspective of the nanomechanical properties and microtribological behavior of acid-eroded *** specimens prepared from extracted human teeth were immersed in citric acid solution(CAS),CAS with 0.03%w/v Xanthan gum and CAS with 0.03%w/v Arabic gum,respectively,for 10 min to obtain three groups of eroded *** nanomechanical properties and microtribological behavior of enamel were examined using nano-indentation/scratch *** results show that compared with Arabic gum,Xanthan gum inhibits enamel surface demineralization and acid permeation more effectively because of a more uniform and denser adsorption on the surface of the *** impairment of the nanomechanical and microtribological properties of the enamel surface by acid erosion is mitigated more significantly by adding trace amounts of Xanthan gum than Arabic *** summary,adding trace food hydrocolloids reduces enamel surface demineralization and inhibits acid permeation to mitigate the influence of erosion on the mechanical and tribological properties of *** adsorption state of food hydrocolloids is the determining factor in the permeability of acid agents into the enamel and plays a significant role in preventing dental erosion.

关键词： dental erosion Xanthan gum Arabic gum nanomechanical properties microtribological behavior

Hot Deformation Mechanism and Ring Rolling Behavior of Powder Metallurgy Ti_2AlNb Intermetallics

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Acta Metallurgica Sinica(English Letters) 2017年第7期30卷 621-629页

作者： zheng-Guan Lu Jie Wu rui-Peng Guo Lei Xu rui Yang Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China School of Materials Science and Engineering Northeastern University

Powder metallurgy（PM） Ti–22Al–24Nb–0.5Mo（at.%） alloys were prepared by hot isostatic pressing. In order to study the feasibility of PM ＋ ring rolling combined process for preparing Ti_2AlNb rings, thermal mechanical simulation tests of PM Ti_2AlNb alloys were conducted and two rectangular PM rings（150 mm in height, 75 mm in thickness,350 mm in external diameter） were rolled as a validation experiment. Experimental results show that the flow stress of Ti_2AlNb alloys exhibited a significant drop at the very beginning of the deformation（true strain／0.1）, and became stable with the increase in strain. Stress instability phenomenon of PM Ti_2AlNb alloys was more obvious than that of wrought alloy. Flow stress fluctuation at the initial stage of deformation is related to phase transition of Ti_2AlNb alloys which strongly depends on heat treatment and thermal mechanical deformation process. Processing windows during initial stage of ring rolling process is very crucial. A sound PM Ti_2AlNb rectangular ring blank（height = 150 mm, thickness = 30 mm, external diameter = 750 mm） was successfully rolled in two passes by using the improved heat preservation method and optimized rolling parameters. Tensile properties of PM Ti_2AlNb alloy were improved, and the porosity was reduced after ring rolling.

关键词： Ti_2AlNb alloy Powder metallurgy Hot deformation Ring rolling

Asymmetric Oscillation and Acoustic Response from an Encapsulated Microbubble Bound within a Small Vessel

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Chinese Physics Letters 2010年第6期27卷 114-117页

作者： HUANG Bei zheng Hai-rong ZHANG Dong Institute of Acoustics Key Laboratory of Modern Acoustics (Ministry of Education) Nanjing University Nanjing 210093 Paul C. Lauterbur Research Center for Biomedical imaging IBHE Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055

Understanding the dynamics of ultrasonic excited microbubbles bound within microvessels is of significance for novel ultrasonic imaging, drug delivery and therapeutic biomedicad applications. A finite element model （FEM） considering acoustic nonlinearity is developed to describe the asymmetric oscillation and acoustic response from mn encapsulated microbubble bound within a small vessel. Numerical simulation is performed for a 2 μm encapsulated microbubble bound within 8-20μm vessels using 2 MHz ultrasound excitation. The oscillation of the bound microbubble becomes more asymmetric under larger ultrasound pressure or within the smaller vessel. The normalized difference between the major and minor axes of epllipse is estimated to be 2.16%for the 8 μm vessel at an acoustic pressure of 0.5 MPa. In addition, the fundamental component of the acoustic scattering from the bound microbubble is enhanced by 6 dB while the second harmonic component is decreased by approximately 29 dB compared with the free microbubble.

关键词： SYMMETRY (Physics) OSCILLATIONS MICROENCAPSULATION BUBBLE dynamics FINITE element method NONLINEAR acoustics ULTRASONIC imaging DRUG delivery systems NUMERICAL analysis

Near-infrared organic photosensitizers with aggregation-induced emission and switchable fluorescence for fungal infection therapy

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Science China Chemistry 2025年

作者： Xinzhe Yang Zixuan Huang Keke Ding Huili Yang Lirong Wang Qing Xia rong Hu Guang Shi Bingjia Xu Anjun Qin School of Chemistry South China Normal University State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates Center for Aggregation-Induced Emission AIE Institute South China University of Technology Department of Urology The First Affiliated Hospital of Wannan Medical College (Yijishan Hospital of Wannan Medical College) School of Chemistry and Chemical Engineering University of South China

The development of near-infrared (NIR) photosensitizers with aggregation-induced emission (AIE) properties,switchable luminescence colors,and satisfactory photodynamic therapy (PDT) effects on the treatment of fungal infection is of great importance but very ***,two ionic organic luminogens are constructed by employing diphenylamine,diphenylacrylonitrile/1,2-diphenylethene,and methylated quinoline cation as building *** is found that the resulting compounds TCQF and TQF show apparent AIE properties and produce intense fluorescence with high photoluminescence quantum yields of up to 31.2%in the solid *** the meantime,their emission colors can be switched between red and NIR and in the NIR region by mechanical force and solvent vapor,respectively,thereby enabling remarkable and reversible mechanochromism with emission variations of up to 104 *** excitingly,TCQF and TQF can efficiently generate ROS under the illumination of white light and show excellent antimicrobial activities and satisfactory PDT *** by the unique anti-fungus properties,TCQF is employed as a biocompatible NIR photosensitizer for treating wound infection with ***,and apparent PDT effects are *** work provides a new direction for the development of multifunctional NIR materials with AIE properties.

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Overview of juvenile localized scleroderma and its management

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World Journal of Pediatrics 2020年第1期16卷 5-18页

作者： Suzanne C.Li rong-Jun zheng Department of Pediatrics Division of Pediatric RheumatologyJoseph M.Sanzari Children's HospitalHackensack University Medical Center30 Prospect AvenueImus 337Hackensack 07601NJUSA Department of Pediatrics Hackensack Meridian School of Medicine at Seton Hall UniversityClifton 07110NJUSA Department of Rheumatology Immunologyand AllergyChildren's HospitalZhejiang University School of MedicineHangzhou 310003China

Background Juvenile localized scleroderma(JLS)is a rare pediatric disease characterized by inflammation and skin thick *** is associated with deep tissue and extracutaneous involvement that often results in functional impairment and growth *** article provides an overview of the disease with a focus on active features and *** sources We searched databases including PubMed,Elsevier and MedLine and Wanfang,reviewing publications from 2013 to *** earlier publications were also *** Linear scleroderma is the most common JLS *** lines of evidence suggest that JLS is an autoimmune *** involvement is common and can present before the onset of skin *** skin features are associated with disease activity,and activity can also manifest as arthritis,myositis,uveitis,seizures,and growth *** immunosuppressive treatment,commonly methotrexate with or without glucocorticoids,greatly improves outcome and is recommended for treating JLS patients with active disease and moderate or higher *** term monitoring is needed because of the disease's chronicity and the high frequency of relapses off of *** JLS is associated with a risk for disabling and disfiguring morbidity for the growing *** active disease is important for guiding treatment,but often difficult because of the paucity of markers and lack of a universal skin activity *** studies of JLS pathophysiology are needed to allow the identification of biomarkers and therapeutic *** effectiveness treatment studies are also needed to work towards optimizing care and outcome.

关键词： Disease activity Extracutaneous involvement Juvenile localized scleroderma Morphea Pediatric scleroderma Treatment