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Gradient Wetting Transition from the Wenzel to Robust Cassie-Baxter states along Nanopillared Cicada Wing and Underlying Mechanism

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Journal of Bionic Engineering 2020年第5期17卷 1009-1018页

作者： Heng xie Hanxiong Huang Lab for Micro Molding and Polymer Rheology Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing and Key Laboratory of Polymer Processing Engineering(Ministry of Education)South China University of TechnologyGuangzhou 510640China

Gradient wettability is important for some living ***,the dynamic respons.s.of water droplets impacting on the surfaces of four regions along the wing vein of cicada Cryptotympana atratafabricius are *** is revealed that a gradient wetting behavior from hydrophilicity(the Wenzel state)to hydrophobicity and further to superhydrophobicity(the Cassie-Baxter state)appears from the foot to apex of the *** droplets impacting on the hydrophilic region of the wing cannot rebound,whereas those impacting on the hydrophobic region can retract and completely *** hydrophobic region exhibits robust water-repelling performance during the dynamic droplet ***,a droplet sitting on the hydrophobic region can recover its.s.herical shape after squeezed to a water film as thin as 0.45 mm,and lossless droplet transportation can be achieved at the *** on the geometric parameters of the nanopillars at the hydrophilic and hydrophobic regions on the cicada wing,two wetting models are developed for elucidating the mechanism for the gradient wetting *** work directs the design and fabrication of surfaces with gradient wetting behavior by mimicking the nanopillars on cicada wing surface.

关键词： cicada wing nanopillared surface biomimetic gradient wetting transition dynamic wetting behavior

The unusual 2014–2016 El Nino events: Dynamics, prediction and enlightenments

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science China Earth sciences 2020年第5期63卷 626-633页

作者： Ruihuang xie Xianghui FANG CAs Key Laboratory of Ocean Circulation and Waves Institute of Oceanologyand Center for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Ocean and Climate Dynamics Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Department of Atmospheric and Oceanic sciences&Institute of Atmospheric sciences Fudan UniversityShanghai 200438China Innovation Center of Ocean and Atmosphere s.s.em Zhuhai Fudan Innovation Research InstituteZhuhai 518057China

The 2014–2016 El Ni?o events cons.s. of a stalled El Ni?o event in the winter of 2014/2015 and a following extreme El Ni?o event in the end of *** event was.s.ccessfully predicted in operational prediction *** of the unusual evolutions of these events that rarely happened in the historical observations,few experience was ready for understanding and predicting the two El Ni?o events when they *** due to their specialties,considerable attention were attracted with aims to reveal the hidden *** article reviews the recent progress.s.and knowledge that were obtained in these *** from these studies,it was argued that the key factor that was responsible for the stalled El Ni?o in 2014 was the unexpected summertime Easterly Wind surges(EWss)or the lack of summertime Westerly Wind Burs.s.WWBs).Most operational prediction models failed to reproduce such stochastic winds and thus made unrealistic *** two El Ni?o events awakened the research community again to incorporate the state-of-the-art climate models to simulate the stochastic winds and investigate their roles in the development of El Nino.

关键词： El Nino Westerly Wind Bursts Easterly Wind surges Operational prediction models

Fuzzy Modeling of Non-Uniformly sampling Nonlinear s.s.ems Based on Clustering Method and Convergence Analysis

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Journal of s.s.ems.s.ience & Complexity 2021年第2期34卷 502-519页

作者： WANG Hongwei xie Lirong school of Electrical Engineering Xinjiang UniversityUrumqi 830047China school of Control science and Control Engineering Dalian University of TechnologyDalian 116024China

The studying motivation of this paper is that there exist many modeling issues of nonuniformly sampling nonlinear s.s.ems in industrial *** on multi-model modeling principle,the corresponding model of non-uniformly sampling nonlinear s.s.ems is described by the nonlinear weighted combination of some linear models at local working *** modeling based on multimodel scheme is a common method to describe the dynamic process of non-linear *** this paper,the fuzzy modeling method of non-uniformly sampling nonlinear s.s.ems is *** premise structure of the fuzzy model is confirmed by GK fuzzy clustering,and the conclusion parameters of the fuzzy model are estimated by the recursive least squared *** convergence perfromance of the proposed identification algorithm is given by using lemmas and martingale ***,the simulation example is given to demonstrate the effectiveness of the proposed method.

关键词： Convergence analysis fuzzy modeling nonlinear s.s.ems non-uniformly sampling s.s.ems

Robust resource allocation for NOMA-ass.s.ed heterogeneous networks

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Digital Communications and Networks 2022年第2期8卷 208-214页

作者： Hao xie Yongjun Xu school of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing400065China

As a promising technology to improve spectrum efficiency and transmission coverage,Heterogeneous Network(HetNet)has attracted the attention of many scholars in recent ***,with the introduction of the Non-Orthogonal Multiple Access(NOMA)technology,the NOMA-ass.s.ed HetNet cannot only improve the s.s.em capacity but also allow more users to utilize the same frequency band resource,which makes the NOMA-ass.s.ed HetNet a hot ***,traditional resource allocation schemes assume that base stations can exactly estimate direct link gains and cross-tier link gains,which is impractical for practical HetNets due to the impact of channel delays and random *** further improve energy utilization and s.s.em robustness,in this paper,we investigate a robust resource allocation problem to maximize the total Energy Efficiency(EE)of small-Cell Users.s.Us)in NOMA-ass.s.ed HetNets under imperfect channel state *** considering bounded channel uncertainties,the robust resource optimization problem is formulated as a mixed-integer and nonlinear programming problem under the constraints of the cross-tier interference power of macrocell users,the maximum transmit power of small base station,the Resource Block(RB)assignment,and the quality of service requirement of each *** original problem is converted into an equivalent convex optimization problem by using Dinkelbach's method and the successive convex approximation method.A robust Dinkelbach-based iteration algorithm is designed by jointly optimizing the transmit power and the RB *** results verify that the proposed algorithm has better EE and robustness than the existing algorithms.

关键词： Heterogeneous network Imperfect channel state information Non-orthogonal multiple access Robust resource allocation Energy efficiency maximization

synergistic modification of the tribological properties of polytetrafluoroethylene with polyimide and boron nitride

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Friction 2021年第6期9卷 1474-1491页

作者： Chaojie xie Kejian WANG College of Mechanical and Electrical Engineering Beijing University of Chemical TechnologyBeijing 100029China

Polytetrafluoroethylene(PTFE)blended with polyimide(PI)and filled with boron nitride(BN)is prepared through cold pressing and sintering for composites with remarkable wear res.s.ance and reduced coefficient of friction(COF).The characterizations.s.ow that BN and PI at different levels,improve the hardness,dynamic thermo-mechanical modulus,thermal conductivity,and tribological properties of *** boos.s.the dispersion and bonding of BN in *** dry sliding friction of a block-on-ring tribometer,the wear rate and COF of 10:10:80 BN/PI/PTFE reduce to almost 1/300 and 80%of those of pure PTFE,respectively,as the wear mechanism transition from being adhesive to partially *** occurs only when the additives BN and PI induce a synergistic effect,that is,at concentrations that are not higher than ca.10 wt%and 15 wt%,*** obvious agglomeration at high percentages of added PI and severe conditions(400 N and 400 rpm)induce strong adhesive *** variations in the tensile properties,hardness,crystallization,and microstructure of the composites correspond to different *** multiple parameters of the plots of wear and friction are transformed into their contour *** mechanism transition maps aid in understanding the influence of various test conditions and composite compositions on the contact surfaces in the space-time framework of wear.

关键词： wear mechanism coefficient of friction(COF) transition map polytetrafluoroethylene(PTFE) polyimide(PI) boron nitride(BN)

scattering for Focusing Combined Power-type NLs

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Acta Mathematica sinica,English series 2014年第5期30卷 805-826页

作者： Jian xie Department of Mathematics Hangzhou Normal University

We consider the scattering of Cauchy problem for the focusing combined power-type schroodinger equation. In the spirit of concentration-compactness method, we will show that, H1 solution will scatter under some condit... 详细信息

关键词： Nonlinear schroodinger equation scattering concentration-compactness method

Turbulence statistics of Thermo-Buoyancy supercritical Fuel Flow in a Regenerative Cooling Channel

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Journal of Thermal science 2024年第1期33卷 126-137页

作者： sUN Feng xie Gongnan school of Marine science and Technology Northwestern Polytechnical UniversityXi'an 710072China Department of Thermal Engineering Tsinghua UniversityBeijing 100084China

Active regenerative cooling with supercritical hydrocarbon fuel is considered as the most promising thermal protection *** existence of buoyancy force would lead to strongly anisotropic flow and thermal transport *** is closely related to the cooling performance of the *** elucidate the mechanis.s.of turbulent transport,the large eddy simulation(LEs) was performed to ass.s. turbulence statistics within different turbulence *** results indicated that the buoyancy and inertial force together dominated the change of turbulent ***,the spatial thermal buoyancy effect significantly suppressed the vertical velocity *** is due to the laminar motion caused by the buoyancy force,thereby weakening the thermal *** the statistics of velocity fluctuation,it was found that the buoyancy force and inertial force greatly weaken the vertical and streamwise velocity fluctuation,*** the statistics of thermal transport,the results pointed out that the near-wall heat transport characteristics need to be paid more *** thickness of the temperature mixing boundary layer led to the attenuation of vertical heat flux,which inhibited vertical temperature diffusion and predisposed to extreme conditions of heat transfer *** results can enhance the academic understanding of the heat transfer mechanism of supercritical fluids,and give guidance for further applications of thermal protection.

关键词： active regenerative cooling large eddy simulation(LEs) buoyancy force turbulence statistics

Entropy-based guidance and predictive modelling of pedestrians’visual attention in urban environment

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Building simulation 2024年第10期17卷 1659-1674页

作者： Qixu xie Li Zhang Department of Architecture School of ArchitectureTsinghua UniversityBeijing 100084China Urban Ergonomics Lab School of ArchitectureTsinghua UniversityBeijing 100084China

selective visual attention determines what pedestrians notice and ignore in urban *** cons.s.ency exis.s.between different individuals’visual attention,designers can modify design by underlining mechanis.s.to better meet user ***,the mechanism of pedestrians’visual attention remains poorly understood,and it is challenging to forecast which position will attract pedestrians more in urban *** address this gap,we employed 360°video and immersive virtual reality to simulate walking scenarios and record eye movement in 138 *** findings reveal a remarkable cons.s.ency in fixation distribution across individuals,exceeding both chance and orientation *** driver of this cons.s.ency emerges as a strategy of information maximization,with participants tending to fixate areas of higher local ***,we built the first eye movement dataset for panorama videos of diverse urban walking scenes,and developed a predictive model to forecast pedestrians’visual attention by supervised deep *** predictive model aids designers in better understanding how pedestrians will visually interact with the urban environment during the design phase.

关键词： visual attention pedestrian eye-tracking local entropy deep learning urban ergonomics

shape Memory Polymers:Ever Evolving shape Morphing Characteristics

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Chinese Journal of Polymer science 2023年第3期41卷 325-326页

作者： Tao xie state Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang University

shape memory effect (sME) of polymers refers to their ability to fix temporary shapes and revert to their permanent shapes in an on demand *** the permanent shape is typically determined by the molding process.s.the temporary shape(s) can be arbitrarily defined by an external force applied during the programming step(or shape fixing step).This attribute differentiates.s.ape memory polymers (sMP) from many other class.s.of stimuli-responsive shape-changing polymers,in terms of both the material behaviors and potential applications.

关键词： permanent arbitrarily programming