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Journal of Environmental Sciences 2005年第5期17卷 866-868页

作者： cai Yue-wei CHEN xiao-yong Shanghai Key Laboratory for Ecological Processes and Restoration in Urban Areas Department of Environmental Sciences East China Normal University Shanghai 200062 China

Our previous studies indicated that genotypes at locus Sod-1 of Poa annua changed clinally along a gradient of gaseous organic pollution. In the present study, we aimed to know whether there were differential responses of activities of different superoxide dismutase （SOD） genotypes to short-term treatment of ambient gaseous organic pollution. Significant bias from Hardy-Weinberg equibrium was observed on locus Sod-1, and no genotype Sod- l-BB was found. Significantly increased activities were observed in most treatments for genotype Sod-1-AA and in one treatment for genotype Sod-1-AB. However, no significant difference in SOD activities was found between the two genotypes. It was interpreted that fitness difference between the two genotypes was small and treatment duration was too short or extent of ambient organic pollution was too low to lead to differential responses. Other environmental factor effects on activities of superoxide dismutases can also explain the results.

关键词： superoxide dismutase genotype activity gaseous organic pollution Poa annua

Tunable chiroptical application by encapsulating achiral lanthanide complexes into chiral MOF thin films

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Nano Research 2022年第2期15卷 1102-1108页

作者： Rui Zhai Yihong xiao Zhigang gu Jian Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China

Chiral metal-organic frameworks(chirMOFs)have been widely considered on enantioselective adsorption/separation,asymmetric catalysis,biological and nonlinear optical ***,chirMOFs are facing a great challenge in development of chiroptical thin films with circularly polarized luminescence(CPL)***,we first report CPL thin films by encapsulating achiral lanthanide complexes Ln(acac)_(3)(Ln=Eu_(a)Tb_(b)Gd_(c))into the pores of surface-coordinated chirMOF thin films(SURchirMOF)[Zn_(2)(cam)_(2)dabco]_(n) with layer by layer(Ibl)encapsulation *** to the unique combination of chiral porous MOF and adjustable luminescent complexes in the host-guest thin films,the obtained Ln(acac)_(3)@SURchirMOF possess strong and tunable CPL property with high dissymmetry *** compared CPL and fluorescent lifetime results show that the advantage of this preparation strategy can effectively achieve energy transfer from Ln(acac)_(3) to SURchirMOF,resulting in an excellent CPL *** study not only provides a novel strategy to develop new types of chiral thin films but also offers an efficient approach for tunable chiroptical applications.

关键词： metal-organic frameworks lanthanide complexes thin films encapsulation chiral optical application

Asymptotic controllability of a class of discrete-time systems with disturbances

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Journal of Systems Engineering and Electronics 2009年第6期20卷 1296-1300页

作者： cai Xiushan Wang xiao Xu Xiuling Coll. of Mathematics Physics and Information Engineering Zhejiang Normal Univ. Jinhua 321004 P. R. China

This article deals with the uniformly globally asymptotic controllability of discrete nonlinear systems with *** is shown that the system is uniformly globally asymptotic controllability with respect to a closed set if and only if there exists a smooth control Lyapunov ***, it is obtained that the control Lyapunov function may be used to construct a feedback law to stabilize the closed-loop *** addition, it is proved that for periodic discrete systems, the resulted control Lyapunov functions are also time periodic.

关键词： nonlinear systems asymptotic controllability control Lyapunov functions discrete time disturbances.

Vapor-assisted epitaxial growth of porphyrin-based MOF thin film for nonlinear optical limiting

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Science China Chemistry 2020年第8期63卷 1059-1065页

作者： Yi-Hong xiao Zhi-Gang gu Jian Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China

Fabrication of metal-organic frameworks(MOFs)thin films has been an efficient way to expand their functionalities and ***,we use the vapor-assisted deposition(VAD)method to epitaxially grow a porphyrin-based MOF PCN-222 *** is,vapor source assists to deposit pre-treated precursor solution on quartz substrate to form a continuous PCN-222 ***,utilizing the post-treated encapsulation of functional carbon-based nanoparticles,the carbon nanodots(CND)and Pt doped CND(Pt/CND)are well loaded into the pores of PCN-222 film,the size(~3.1 nm)of which is highly close to the pore size of the corresponding MOF(~3.7 nm).The Z-scan results reveal that PCN-222 film exhibits high reverse saturable *** addition,encapsulation of carbon based nanodots into PCN-222 film could enhance the nonlinear optical limiting effect benefiting from the host-guest *** study serves to present both the available toolbox of thin film preparation and high potential for precise synthetic nanocomposite films in optical limiting devices.

关键词： metal-organic framework epitaxial growth porphyrin thin film nonlinear optical property

Research on an Arc Air-Lubricating Oil Radiator Equipped in Internal Surface of Air Intake for the Aero Engine

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Journal of Thermal Science 2020年第3期29卷 687-696页

作者： cai Huikun WENG Zeju LIAO Yidai gu Kaixuan WANG Junjie Department of Mechanical and Electronic Engineering of Xiamen University Xiamen UniversityXiamen 361102China CAS Key Laboratory of Cryogenics Technical Institute of Physics and Chemistry of the Chinese Acadermy of SciencesBejing 100190China

Due to huge-power aircraft development and more electronic devices applied onboard,high heat flow density and uneven thermal distribution are becoming new *** new try is adding an air-lubricating oil radiator as the secondary cooling component but there are still few reports on its ***,this paper proposes a newly-design plate-fin air-lubricating oil radiator different from tube-fin or shell-tube conventionally used in previous engine *** radiator is arc,and equipped in internal surface of air *** and experimental analyses were carried out on fin *** results agreed well with average error of 13%on thermal *** heat and flow behaviors of oil side were presented with different structures and sizes of flowing *** to all research,optimized radiator is gained with fin spacing of 3.76 mm,fin thickness of 2 mm,single flowing path with width of 13 mm and gradient inlet and *** heat dissipation of 28.35 k W and pressure loss of 2.2 MPa can meet actual working *** research proves an air-lubricating oil radiator with arc structure and layout mode of internal surface to be feasible,which is a new but efficient cooling scheme and can lead to an innovative but wide use in modern aircrafts.

关键词： aero engine air-lubricating oil radiator arc plate-fin radiator oil flowing path internal surface of air intake

Global Existence of Strong Solutions for the Generalized Navier-Stokes Equations with Damping

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Acta Mathematicae Applicatae Sinica 2022年第3期38卷 627-634页

作者： xiao-jing cai Yan-jie ZHOU School of mathematics and statistics Beijing Technology and Business UniversityBeijing 100048China

This paper mainly focus on the global existence of the strong solutions for the generalized NavierStokes equations with damping. We obtain the global existence and uniqueness when α ≥5/4 for β ≥ 1 and when 1/2+β/... 详细信息

关键词： generalized Navier-Stokes equations damping global existence

Intrinsic high thermal conductive liquid crystal epoxy film simultaneously combining with excellent intrinsic self-healing performance

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Journal of Materials Science & Technology 2021年第9期68卷 209-215页

作者： Xutong Yang xiao Zhong Junliang Zhang Junwei gu Research&Development JnsMute of Northwestern Polytechnical University in Shenzhen Guangdong518057China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'anShaanxi710072China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471023China

One kind of side chain liquid crystal epoxy(S-LCE) based on biphenyl mesomorphic unit is synthesized from 2,2-bis(hydroxymethyl)propionic acid,4-phenyl phenol,and *** the intrinsic thermal conductive liquid crystal epoxy film(LCEF) simultaneously combining with intrinsic self-healing performance is then prepared via thiol-epoxide nucleophilic ring-opening reaction and coating method.1 H NMR and FTIR show that S-LCE and LCEF have been successfully prepared.S-LCE presents nematic liquid crystal from room temperature to 160℃.LCEF maintains nematic liquid crystal performance and shows highly intrinsic thermal conductivity & excellent self-healing *** conductivity coefficient(λ)values in vertical direction(λ⊥)and parallel direction(λ‖)of LCEF are 0.33 and 1.25 W/mK,re spectively,much higher than that of general bisphenol A epoxy resin(E-51,λ⊥ of 0.19 W/mK and λ‖ of0.65 W/mK).Tensile strength of LCEF is 10.6 MPa,which can maintain at 90.6 % and 61.3 % after one and four cycles of self-healing behavior,*** addition,LCEF presents a wide service temperature range(-9.8-251℃) and good thermal stability(THRI of 148.5℃).Simultaneously,LCEF has good transparency,flexibility,and tailorability,expected to be utilized in the fields of flexible electronic devices and intelligent structures.

关键词： Liquid crystal epoxy Self-healing performance Intrinsic thermal conductivity Thermal stability

Cell Ultrastructure of Kiwifruit (Actinidia chinensis) Shoot Tips During Cryopreservation

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Agricultural Sciences in China 2006年第8期5卷 587-590页

作者： XU xiao-biao cai Zi-guo gu Qing-qing ZHANG Qiu-ming College of Agronomy Jiangxi Agricultural University Nanchang 330045 P.R.China College of Horticulture and Landscape Hunan Agricultural University Changsha 410128 P.R.China Horticultural Department Henan Scientific and Technological College Xinxiang 453000 P.R.China

The changes in the cell ultrastructure of in vitro cultured shoot tips from dwarf genotype of kiwifruit （Actinidia chinensis Ganmi 5） during cryopreservation were investigated. Shoot tips were preserved in liquid nitrogen using vitrification, and the cell ultrastructure was examined using transmission electron microscopy （TEM）. The regular ultrastructure of the cell wall, cell membrane and nucleus of shoot tips could be damaged during the freezing and thawing associated with preservation using liquid nitrogen. The cell plasmolysis was increased and freezing tolerance was improved after precultufing and dehydrating in a preservation and vitrification solution （PVS2）（30% glycerol （Gly）＋ 15% ethylene glycol （EG）＋ 15% dimethylsulfoxide （DMSO）＋ 0.4 mol L^-1 sucrose）. The structure of some cells with low degree of injury and reversible damage was similar to that of the control and they could undergo normal cell division and differentiation. Besides, they could recover automatically and regenerate after their reculture.

关键词： cryopreservation vitrification shoot tips ultrastructure kiwifruit

Data-based flooding fault diagnosis of proton exchange membrane fuel cell systems using LSTM networks

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Energy and AI 2021年第2期4卷 45-56页

作者： Xin gu Zhongjun Hou Jun cai Shanghai Hydrogen Propulsion Technology Co. Ltd.Unit 10BLDG 17Innovation ParkLane 56Antuo Rd.JiadingShanghai PR China

Flooding fault diagnosis is critical to the stable and efficient operation of fuel cells,while the on-board embedded controller has limited computing power and sensors,making it difficult to incorporate the complex gas-liquid two-phase flow *** in fuel cell system for cars,the neural network modeling is usually regarded as an appropriate tool for the on-line diagnosis of water *** neural network classifiers are not good at processing time series data,so in this paper,Long Short-Term Memory(LSTM)network model is developed and applied to the flooding fault diagnosis based on the embedded ***,the fuel cell auxiliary system statuses are adopted as the inputs of the diagnosis network,which avoids installing a large number of sensors in the fuel cell system,and contributes to reduce the total system *** bench test on the 92 kW vehicle fuel cell system proved that this model can effectively diagnose/pre-diagnose the fuel cell flooding,and thus help optimize the water management under vehicle conditions.

关键词： Proton exchange membrane fuel cell Flooding diagnosis Data-driven diagnosis Long Short-Term Memory network

Liutex (vortex) core definition and automatic identification for turbulence vortex structures

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Journal of Hydrodynamics 2019年第5期31卷 857-863页

作者： Hongyi Xu xiao-shu cai Chaoqun Liu Aeronautics and Astronautics Department Fudan UniversityShanghai 200433China School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Mathematics University of Texas at ArlingtonArlington 76019TexasUSA

As a milestone research in vortex identification(VI),the physical quantity of Liutex,including its forms of scalar,vector and tensor,was systematically explored and rigorously obtained as the third-generation(3G)of the vortex definition and identification methods distinguished from the first generation(1G)by vorticity and the second generation(2G)by the vortex identification(VI)criteria solely dependent on the velocity gradient tensor *** on these findings,the vortex-core lines were abstracted from the well-defined Liutex,and for the first time,were automatically generated and massively visualized using *** distinctive characteristics of these vortex cores with the intriguing threshold-independency make them be the uniquely appropriate entity to represent and to depict the vortex structures in *** letter made use of the DNS data for the natural transition in a zero-pressure gradient flat-plate(Type-A turbulent boundary layer(TBL))and the fully-developed turbulence in a square annular duct(Type-B TBL)to demonstrate the vortex structure represented by the vortex-core *** 3G VI approach based on the vortex-core lines is capable of profoundly uncovering the vortex ***,the capability of automatically identifying the vortex cores and massively visualizing the large number of vortex-core behaviors in a transient way will enable the fluid-mechanics and other related-science communities to step into a new era to explore the intrinsic natures of the centennial puzzle of turbulence and other vortex-related phenomena in future.

关键词： Direct numerical simulation turbulence structure vortex core identification and automation