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Science China(Information Sciences) 2012年第5期55卷 983-993页

作者： GAO Lin1,ZHANG GuoXin 1 & LAI YuKun 2 1 Department of Computer Science and Technology,Tsinghua University,Beijing 100084,China 2 School of Computer Science and Informatics,Cardiff University,Wales CF24 3AA,UK 1. Department of Computer Science and Technology Tsinghua University Beijing 100084 China2. School of Computer Science and Informatics Cardiff University Wales CF24 3AA UK

shape deformation is a fundamental tool in geometric *** methods consider preserving local details by minimizing some energy functional measuring local distortions in the L 2 *** strategy distributes distortions quite uniformly to all the vertices and penalizes ***,there is no unique answer for a natural deformation as it depends on the nature of the *** by recent sparse signal reconstruction work with non L 2 norm,we introduce general L p norms to shape deformation;the positive parameter p provides the user with a flexible control over the distribution of unavoidable *** with the traditional L 2 norm,using smaller p,distortions tend to be distributed to a sparse set of vertices,typically in feature regions,thus making most areas less distorted and structures better *** the other hand,using larger p tends to distribute distortions more evenly across the whole *** flexibility is often desirable as it mimics objects made up with different *** specifying varying p over the shape,more flexible control can be *** demonstrate the effectiveness of the proposed algorithm with various examples.

关键词： shape deformation Lp norm geometric modeling

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Near-infrared responsive shape memory hydrogels with programmable and complex shape-morphing

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Science China(Technological Sciences) 2021年第8期64卷 1752-1764页

作者： WANG QiLin ZHU Lin WEI DanDan SUN Huan TANG Chen LIU Zhao LI Ke YANG Jia QIN Gang SUN GengZhi CHEN Qiang School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo454000China Wenzhou Institute University of Chinese Academy of SciencesWenzhou352001China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing211816China

In this work,semi-crystalline nanocomposite hydrogels(i.e.,PAAmA_(11)A/GO gels)were synthesized by micellar copolymerization of acrylamide and N-acryloyl-11-aminoundecanoic acid(A_(11)A)in the presence of a large amount of sodium dodecyl sulfonate(SDS)micelles and GO *** resulting hydrogels(SMHs)not only demonstrated high strength and high toughness,but also exhibited good shape memory *** of near-infrared(NIR)light absorbability of GO nanosheets,shape recovery and shape of PAAmA_(11)A/GO gels could be tuned by NIR ***,bilayer hydrogels and trilayer hydrogels were also fabricated by the integration of shape-memorized PAAmA_(11)A/GO gel and elastic hydrophobic associated hydrogel(E-gel).Based on the NIR-responsive shape memory property and layered structure,shape deformation of bilayer hydrogels and trilayer hydrogels was rather different from the single PAAmA_(11)A/GO *** kind of gel structure exhibited diverse and complex shapes via programmable NIR *** importantly,the shape morphing of NIR-SMHs-based hydrogels could mimic the hand and flower and be used as actuators.

关键词： shape memory hydrogels near-infrared responsive bilayer hydrogels shape deformation actuators

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Dual-responsive fiber-reinforced hydrogel actuators by direct ion patterning

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Nano Research 2023年第12期16卷 13381-13391页

作者： Mingyuan Zhao Dong Han Yuan Meng Jing Liu Yuting Zhu Zhongxian Li Kai Li Wentao Liu Zhuo Ao CAS Center for Excellence in Nanoscience National Center for Nanoscience and TechnologyBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China College of Life Sciences Beijing University of Chinese MedicineBeijing 100029China

Nature inspired deformable heterogeneous smart hydrogels have attracted much attention in many fields such as biomedicine devices and soft ***,normal spatial heterogeneous hydrogel structures can only respond to single factor and take one action as set in ***,we report a pre-stretched metal-liganded shape memory hydrogel with fiber reinforced,P(AAc-co-AAm)/CCNFs-Fe3+(CCNFs:carboxylated cellulose nanofibers,AAc:acrylic acid,AAm:acrylamide),which can conduct shape deformation by solvent induction and ultraviolet(UV)*** deformation pattern could be programmed by the deposing of ferroin ***,the pre-stretched shape memory hydrogels could effectively produce cyclic actuation or complex shape actuation by UV *** importantly,combining the solvent response with the light response enabled complex reversible actuations,such as simulating the bending and unfolding of *** addition of CCNFs significantly enhanced the mechanical properties of the *** hydrogels with 3 wt.%CCNFs showed an elongation at break of about 500%and a significant increase in tensile strength of 8.7-fold to 1.55 MPa after coordination with metal ions,which was able to meet the mechanical requirements of the bionic actuated *** work demonstrated that combining light-programmed and light-responsive shape-memory hydrogels,complemented by another independent response property,could achieve complex and reversible programmed actuations.

关键词： dual responsive hydrogel shape deformation metal ion pattern carboxylated cellulose nanofibers(CCNFs) light induction

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A three-dimensional CFD study of the hydrodynamic behavior of equal and unequal-sized in-line methane bubbles at high pressure

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1792-1802页

作者： Nikolaos A.Avgerinos Dionissios P.Margaris Department of Mechanical Engineering and Aeronautics Fluid Mechanics Laboratory University of Patras

The hydrodynamic behavior of multiple bubbles rising upward is a field of ongoing research since various aspects of their interaction require further analysis. shape deformation, rise velocity, and drag coefficient are some of the uncertainties to be determined in a bubble upward flow. For this study the predictions of the three-dimensional numerical simulations of the volume of fluid（VOF） CFD model were first compared with experimental results available in the literature, serving as benchmark cases. Next, 28 cases of pairs of equal and unequal-sized in-line pairs of bubbles moving upwards were simulated. The bubble size varied between 2.0–10 mm. Breakthrough of the present study is the small initial distance of 2.5 R between the center of the bubbles. To provide a more practical nature in this study material properties were selected to match methane gas and seawater properties at deepsea conditions of 15 MPa and 4 ℃, thus yielding a fluid-to-bubble density ratio λ = 7.45 and viscosity ratio n = 100.46. This is one of the few studies to report results of the coalescence procedure in this context. The hydrodynamic behavior of the leading and trailing bubbles was thoroughly studied. Simulation results of the evolution of the rise velocity and the shape deformation with time indicate that the assumption that the leading bubble is rising as a free rising single one is not valid for bubbles between 2.0–7.0 mm. Finally, results of the volume of the daughter bubble exhibited an oscillating nature.

关键词： Bubble Coalescence Computational fluid dynamics, CFD Methane Rise velocity shape deformation

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