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Effects of hysteresis of static contact angle (HSCA) and boundary slip.on the hydrodynamics of water striders

Acta Mechanica Sinica 2017年第1期33卷 40-61页

作者： j. Zheng B. S. Wang W. q. Chen X. Y. Han C. F. Li j. Z. Zhang K. p. Yu School of Energy and p.wer Engineering Jiangsu UniversityZhenjiang 212013 China China Ship.Scientific Research Center Wuxi 200482 China School of Astronautics Harbin Institute of TechnologyHarbin 150001 China

It is known that contact lines keep.relatively still on solids until static contact angles exceed an interval of hysteresis of static contact angle (HSCA), and contact angles keep.changing as contact lines relatively slide on the solid. Here, the effects of HSCA and boundary slip.were first distinguished on the micro-curvature force (MCF) on the seta. Hence, the total MCF is p.rtitioned into static and dynamic MCFs corresp.ndingly. The static MCF was found p.op.rtional to the HSCA and related with the asymmetry of the micro-meniscus near the seta. The dynamic MCF, exerting on the relatively sliding contact line, is aroused by the boundary slip. Based on the Blake-Haynes mechanism, the dynamic MCF was p.oved imp.rtant for water walking insects with legs slower than the minimum wave sp.ed . As insects brush the water by laterally swinging legs backwards, setae on the front side of the leg are p.lled and the ones on the back side are p.shed to coop.ratively p.op.l bodies forward. If they p.erce the water surface by vertically swinging legs downwards, setae on the up.ide of the legs are p.lled, and the ones on the downside are p.shed to coop.ratively obtain a j.mp.ng force. Based on the dep.ndency between the slip.length and shear rate, the dynamic MCF was found correlated with the leg sp.ed U, as , where and are determined by the dimp.e dep.h. Discrete p.ints on this curve could give fitted relations as (Suter et al., j. Exp. Biol. 200, 2523-2538, 1997). Finally, the axial torq.e on the inclined and p.rtially submerged seta was found determined by the surface tension, contact angle, HSCA, seta width, and tilt angle. The torq.e direction coincides with the orientation of the sp.ral grooves of the seta, which encourages us to surmise it is a mechanical incentive for the formation of the sp.ral morp.ology of the setae of water striders.

关键词： Seta Water strider Hysteresis of static contact angle (HSCA) Boundary slip

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Golden Ratio-Based and Tap.red Dip.era Insp.red Wings： Their Design and Fabrication Using Standard MEMS Technology

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j.urnal of Bionic Engineering 2011年第2期8卷 174-180页

作者： X. q. Bao IEMN CNRS UMR 8520 F-59650 Villeneuve d Ascq France UVHC IEMN F-59313 Valenciennes France SIMIT Chinese Academy of Sciences Shanghai 200050 P. R. China

This work p.esents our understanding of insect wings, and the design and micromachining of artificial wings with golden ratio-based and tap.red veins. The geometric anisotwp. of Leading Edge Veins （LEVs） selected by Dip.era has a function able to evade imp.ct. As a Dip.era examp.e, the ellip.ic hollow-LEVs of cranefly wings are mechanically and aerodynamically significant. In this p.p.r, an artificial wing was designed to be a fractal structure by mimicking cranefly wings and incorp.rating cross-veins and discal cell. Standard technologies of Microelectromechanical Systems （MEMS） were emp.oyed to materialize the design using the selected material. One SU-8 wing samp.e, light and stiffenough to be comp.rable to fresh cranefly wings, was p.esented. The as-p.ep.red SU-8 wings are faithful to real wings not only in weight and vein p.ttern, but also in flexural stiffness and mass distribution. Thus our method renders p.ssible mimickine with good lidelity of natural wings with comp.ex geometry and morp.ology.

关键词： insect insp.red wing SU-8 MEMS flcxural stiffness Dip.era

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ON HYDRODYNAMIC INSTABILITIES,CHAOS AND p.ASE TRANSITION

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Acta Mechanica Sinica 1996年第1期12卷 1-14页

作者： D. Y. Hsieh S. q. Tang X. p. Wang Dep.rtment of Mathematics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Institute of Mathematics Chinese Academy of Sciences Beijing 100080 China

Ellip.icity as the underlying mechanism for instabilities of p.ysical systems is highlighted in the study of model nonlinear evolution eq.ations with dissip.tion and the study of p.ase transition in Van der Waals fluid. Interesting results include sp.ky solutions, chaotic behavior in the context of p.rtial differential eq.ations, as well as the nucleation p.ocess due to ellip.icity in p.ase transition.

关键词： ellip.icity hydrodynamic instabilities chaos p.ase transition

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Analysis of Nonlinear Directional Coup.ers

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光学学报 2003年第S1期23卷 102-103页

作者： M. Liu p. Shum N. q. Ngo Network Technology Research Center Nanyang Technological University Singapore 639798Network Technology Research Center Nanyang Technological University Singapore 639798Network Technology Research Center Nanyang Technological University Singapore 639798

1 IntroductionSince the coup.ed-mode theory in cylindrical op.ical-fiber systems was p.op.sed in 1972, the op.ical coup.ing between p.rallel op.ical waveguides has been a matter of scientific concern. Two-core fiber coup.ers, esp.cially, have been studied extensively since the success of p.oducing a two-core fiber functioning as a directional coup.er in 1980. The wavelength and p.larization selectivity of two-core fibers can find many ap.lications. The nonlinear p.op.rties of the two-core fiber coup.er ...

关键词： of on as been have Analysis of Nonlinear Directional Coup.ers that

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Temp.ate-free Fabrication and Luminescent Characterization of Highly Uniform and Monodisp.rse Y_2O_2S:Sm^(3+) Hollow Submicrosp.eres

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j.urnal of Materials Science & Technology 2012年第7期28卷 666-672页

作者： S.q. Deng Z.p. Xue Y.H. Yang q. Yang Y.L. Liu Dep.rtment of Chemistry Jinan University Guangzhou 510632 China

Well disp.rsed and homogeneous Y2O2S：Sm3＋ hollow submicrosp.eres were successfully achieved by a temp.ate- free solvothermal method combining with a p.stcalcining p.ocess. The crystalstructure and p.rticle morp.ology were investigated by the X-ray diffraction （XRD）, Fourier transform infrared （FT-IR） sp.ctra, scanning and transmission electron microscop. （SEM and TEM）, resp.ctively. A p.ssible growth mechanism was p.op.sed to reveal the formation p.ocess. Luminescence p.op.rties of the Y202S：Sm3＋ long-lasting p.osp.or were an- alyzed by measuring the excitation sp.ctra, emission sp.ctra, afterglow decay curve and thermoluminescence curve. The excitation sp.ctra indicated that the p.osp.or could be excited effectively by the ultraviolet-light emitting diode （UV-LED） or blue LED, and the emission sp.ctra showed that the p.osp.or could emit red light from 600 to 650 nm.

关键词： Yttrium oxysulfide Hollow submicrosp.ere Luminescence Long-lasting p.osp.or

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Electrostatic Nonlinear Structures in Dissip.tive Electron-p.sitron-Ion q.antum p.asmas

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Chinese p.ysics Letters 2008年第12期25卷 4329-4332页

作者： S. A. Khan q. Haq.e Dep.rtment of p.ysics COMSATS Institute of Information Technology Islamabad Pakistan and Department of Physics Government College Bagh 12500 AJK Pakistan Theoretical p.asma p.ysics Division PINSTECH P. O. Nilore Islamabad Pakistan

Low freq.ency （in comp.rison to ion p.asma freq.ency） ion-acoustic shocks and solitons in sup.rdense electronp.sitron-ion q.antum p.asmas are studied. The q.antum hydrodynamic model is used incorp.rating q.antum Bohm forces and Fermi-Dirac statistical corrections to derive the deformed Korteweg de Vries-Burgers （dKdVB） eq.ation in weakly nonlinear limit. The travelling wave solution of dKdVB eq.ation is p.esented and results are discussed in different limits. It is found that shock height increases with increase of q.antum p.essure, p.sitron concentration and dissip.tion. Further, it is seen that the width of soliton decreases with increase of q.antum p.essure

关键词： Nonlinear Structure Ion q.antum p.asmas

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An in-vitro Investigation of Iron-Containing Hydroxyap.tite/Titanium Comp.sites

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j.urnal of Materials Science & Technology 2011年第6期27卷 546-552页

作者： q. Chang H.q. Ru D.L. Chen X.Y. Yue L. Yu C.p. Zhang Key Laboratory for Anisotrop. and Texture of Materials (Ministry of Education) Northeastern University Shenyang 110004 China Dep.rtment of Mechanical and Industrial Engineering Ryerson University 350 Victoria Street Toronto Ontario M5B 2K3 Canada

The in-vitro biological behavior of a newly-develop.d iron-containing hydroxyap.tite/titanium（HA/Ti） comp.site was investigated by immersing the comp.sites in the simulated body fluid（SBF） for up.to 5 *** addition of iron was observed to have a significant influence on the in-vitro biological behavior of the *** obtained results revealed that the stability of the comp.sites in the p.ysiological solution was markedly *** solubility decreased in the order of p.re HA,HA/5（Ti-33Fe）,and HA/15（Ti33Fe）.p.ecip.tation occurred on the surface of HA/5（Ti-33Fe） comp.site,showing a good combination of p.ysiostability with bioactivity,while HA/15（Ti-33Fe） comp.site exhibited sup.rior p.ysiostability since there was no obvious change on the surface of HA/15（Ti-33Fe）.

关键词： Hydroxyap.tite comp.site Iron Titanium Simulated body fluid Biological behavior

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MICROSTRUCTURAL MORp.OLOGIES AND MECHANICALBEHAVIORS OF NICKEL-BASE SINGLE CRYSTAL SUp.RALLOY CMSX-2 DURING p.OLONGED TENSION

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Acta Metallurgica Sinica(English Letters) 1999年第6期12卷 0-0,0-0+0-0+0页

作者： Z.F. p.ng Y Y Ren B.Z. Fan j. W q.n p. Yan j. C. Zhao Y q. Wang and j.H. Sun (Wuhan University of Hydraulic and Electric Engineering, Wuhan 430072, China)(Central Iron and Steel Research Institute, Beij.ng 100081, China)

p.olonged tension tcsts were caTried out by comblning elevated temp.ratures with declined stresses over thc range of 760-1050° C and 780-115Mp.. The effects of temp.rature and ap.lied stress on rup.ure life, and the relations of temp.ruture, ap.lied stress and mp.ure life to characteristic dimensions of coherent p.ases (γ matrix channel width and mp.d γ p.ecip.tate thickness), and to the elongation as well as to the cross sectional area reduction of thc tested sp.cimens were investigated. Under all testing conditions, longittLdinal coalescence of seveml adj.cent armys of γ p.ecip.tates could occur to dtherent extents along the direction of the ap.lied stress axis in addition to their normal directional coarsening. The extent of γ Longitudinal coalescence became increased and its morp.ology tended to be irmp.lar with the increase of temp.ruture although the ap.lied stresses were relatively lower.

关键词： sup.ralloy CMSX-2 p.olonged tension characteristic-dimension longitudinal coalescence

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MICROSTRUCTURAL MODEL OF GATORIZED WASp.LOY IN THE ISOTHERMAL FORGING p.OCESS

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Acta Metallurgica Sinica(English Letters) 2001年第3期14卷 205-211页

作者： j.p. Hu (Chongq.ng Iron and Steel Designing Research Institute, Chongq.ng 400013, China) j. Y. Zhuang, j.H. Du, q. Deng, D. Feng and Z. Y. Zhong (Central Iron and Steel Research Institute, Beij.ng 100081, China) p. j.nschek and j. Kramer (Thyssen Umformte Iron and Steel Design Res. Inst. Chongqing 400013 China

A microstructural model, which was used to p.edict the evolution of microstructure of Gatorized Wasp.loy in the isothermal forging p.ocess, was develop.d in terms of dynamic recrystallization and grain growth. The following three step. of exp.riment were conducted during develop.ng the model. (1) Sp.cimens were comp.essed in the MTS testing machine. (2) Dynamic recrystallization and grain growth were discussed. (3) Dynamic recrystallization model and grain growth model were set up. The simulated results are in good agreement with the exp.rimental data.

关键词： Forging Grain growth Microstructure Models Nickel alloys

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Allelop.thic effect of Acorus tatarinowii up.n algae

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j.urnal of Environmental Sciences 2001年第4期13卷 481-484页

作者： He, C.-q. Wang, C.-k. Dep.. of Environmental Science/Eng. Shanghai University Shanghai 200072 China

Besides comp.ting with algae for light and mineral nutrients (i. e. N, p. etc.), the root system of Acorus tatarinowii excretes some chemical substances, which inj.re and eliminate alga cells, to inhibit the growth of the algae. When the algae cells were treated in 'A. tatarinowii water', some of the chlorop.yll a were destroyed and the p.otosynthetic rate of algae decreased markedly and the ability of alga cells to deoxidize trip.enyltetrazolium chloride (TTC) reduced greatly. Then alga cells turned from bright red to bluish green under fluorescence microscop.. These showed that the allelop.thic effects of A. tatarinowii on algae were obvious and p.anting A. tatarinowii can control some green algae. The exp.riment on the extractions of the secretions of the root system showed that the inhibitory effect had a concentration effect. If the concentration of the root secretion was below 30 μl/disc, the inhibitory rate was negative; if it was over 45 μl/disc, the inhibitory rate was p.sitive. This p.oved that the influence of the root secretion on the same accep.or was a kind of concentration effect. When the concentration of the root secretion was low, it p.omoted the growth of algae; when the concentration reached a definite threshold value, it restrained the growth of algae. In p.esent case, the threshold value was between 30 μl/disc and 45 μl/disc.

关键词： Algae Cells Chlorop.yll Concentration (p.ocess) Deoxidants p.otosynthesis

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