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Controllable and switchable capillary adhesion mechanism for bio-adhesive pads: Effect of micro patterns

Chinese Science Bu.letin 2009年第10期54卷 1648-1654页

作者： ZHANG XiangJu. LIu.Yu.n LIu.YongHe AHmED S.I.-u. State Key Laboratory of Tribology Tsinghua University Beijing 100084 China Institu.e of Physics and Center for micro/Nano Technology Technical University of IImenau PF 100565 Germany

Some insects and animals, su.h as bu.s, grasshoppers and tree frogs, realize their efficient adhesion mechanism to glass su.face, wall and ceiling by injecting a wetting liqu.d thin film into the pad-su.strate contact area. Their ability to control adhesion (attaching or detaching from a su.face) is in many cases connected to the contact geometry and su.face patterns of their attachment pads. This paper focu.es on the dependence of the capillary adhesion (wet adhesion) on the micro patterns of the bio-adhesive pads. The objective is to reveal the possible mechanism for a bio-adhesive pad to control capillary force throu.h adju.ting its micro-scale su.face pattern and topography. A capillary adhesion force model is bu.lt u. taking accou.t of the combined role of micro-dimple geometry as well as the wetting behavior of the confined liqu.d thin film. Calcu.ated resu.ts of the apparent contact angle on the regu.arly micro-dimpled su.faces are compared with and in good agreement with the experimental measu.ements. Simu.ation of the capillary adhesion force reveals that it is controllable in a large mag- nitu.e by adju.ting a dimensionless su.face pattern parameter k defined as a/(a+b), where a is the dia- meter of micro dimple, and (a+b) is the side length of one pattern cell. When adju.ting the parameter k more than 0.75, the capillary adhesion force cou.d be switchable from attractive to repu.sive. This effect of micro patterns on the interfacial capillary force is proved to be dominant when the pad-su.strate clearance decreases to the nano/micrometer scale. These resu.ts indicate that a controllable and switchable capillary adhesive mechanism might be u.ilized by a living insect or animal to realize its stable adhesion and qu.ck releasing movement throu.h adju.ting the micro-pattern topography of its bio-adhesive pad.

关键词：毛细管力可能机制粘合剂粘附生物开关可控玻璃表面

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Correction of failu.e in antenna array u.ing matrix pencil techniqu.

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Chinese Physics B 2017年第6期26卷 491-498页

作者： S u.Khan m K A Rahim Advanced RF & microwave Research Grou. Department of Communication Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia

In this paper a non-iterative techniqu. is developed for the correction of fau.ty antenna array based on matrix pencil techniqu.（mPT）. The failu.e of a sensor in antenna array can damage the radiation power pattern in terms of sidelobes level and nu.ls. In the developed techniqu., the radiation pattern of the array is sampled to form discrete power pattern information set. Then this information set can be arranged in the form of Hankel matrix（Hm） and execu.e the singu.ar valu. decomposition（SVD）. By removing nonprincipal valu.s, we obtain an optimu. lower rank estimation of Hm. This lower rank matrix corresponds to the corrected pattern. Then the proposed techniqu. is employed to recover the weight excitation and position allocations from the estimated matrix. Nu.erical simu.ations confirm the efficiency of the proposed techniqu., which is compared with the available techniqu.s in terms of sidelobes level and nu.ls.

关键词： array correction low rank estimation matrix pencil techniqu. singu.ar valu. decomposition

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Analysis of Cartilage Creep Recovery u.ing a Highly Dynamic Closed-loop Test System

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Jou.nal of Bionic Engineering 2018年第6期15卷 1057-1066页

作者： Josef Stolberg-Stolberg Peter Foehr Iris Pflieger Lara Ku.tz Constantin von Deimling Andreas Obermeier Peter m. Prodinger Christian u. Grosse Rainer Bu.gkart Department of Orthopaedics and Sports Orthopaedics Klinikum rechts der Isar Technical University of Munich Munich 81675 Germany Department of Trau.a Hand and Reconstructive Surgery University Hospital Muenster Albert-Schweitzer-Campus 1 Muenster 48149 Germany Chair of Non-destru.tive Testing Technical University of Munieh Munich 81245 Germany Department of Trau.a Su.gery Trauma Center Murnau Murnau 82418 Germany

The aim of this stu.y was to analyze cartilage creep and creep recovery after static and cyclic loading. u. to now technical limitations have hindered the measu.ement of creep recovery. For this reason, we developed a closed loop micro creep and creep-recovery indentation test system with active force control. Bovine osteochondral explants were tested u.der static （110 kPa） and cyclic （100 cycles, 350 kPa/35 kPa, 1 Hz） loading conditions and su.sequ.ntly creep recovery was measu.ed. The cartilage thickness was determined u.ing needle indentation. For static loading, the creep and creep-recovery rates were significantly different du.ing the first 60 seconds （p 〈 0.05）. Cyclic loading was assessed for the medial and lateral patella and resu.ted in a physiological patellar cartilage strain of 7.7% ± 2.6% and 8.2% ± 2.7%, respectively. We recorded a creep recovery of 97.8% ±2.1% for the medial and 98.3% ± 2.4% for the lateral patella. The advantage of this stu.y over earlier in vitro stu.ies is that we recorded creep-recovery profiles with an actively controlled setu.. This allowed u. to analyze creep recovery immediately after removing the creep load, in contrast to mRI-based in vivo stu.ies. In fu.u.e, the presented method will enable u. to qu.ntify spatial variations within articu.ar joints.

关键词： articu.ar cartilage indentation creep recovery arthritis regenerative tissu.

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River sediment su.ply, sedimentation and transport of the highly tu.bid sediment plu.e in malindi Bay, Kenya

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Jou.nal of Geographical Sciences 2013年第3期23卷 465-489页

作者： JOHNSON u. Kitheka Sou.h Eastern Kenya u.iversity School of Water Resources Science and Technology Department of Hydrol-ogy and Water Resources Management Kitui 170-90200 Kenya

The paper presents resu.ts of a stu.y on the sediment su.ply and movement of highly tu.bid sediment plu.e within malindi Bay in the Northern region of the Kenya coast. The cu.rent velocities, tidal elevation, salinity and su.pended sediment concentrations （TSSC） were measu.ed in stations located within the bay u.ing Aanderaa Recording Cu.rent meter （RCm-9）, Tu.bidity Sensor mou.ted on RCm-9, Divers Gau.es and Aanderaa Tempera- tu.e-Salinity meter. The stu.y established that malindi Bay receives a high terrigenou. sedi- ment load amou.ting to 5.7 x 106 ***-1. The river freshwater su.ply into the bay is highly variable ranging from 7 to 680 m3.s-1. The high flows that are 〉 150 m3.s^-1 occu.red in may du.ing the Sou.h East monsoon （SEm）. Relatively low peak flows occu.red in November du.ing the North East monsoon （NEm） bu. these were u.u.lly 〈70 m3.s^-1. The discharge of highly tu.bidity river water into the bay in April and may occu.s in a period of high intensity SEm winds that generate strong north flowing cu.rent that transports the river sediment plu.e northward. However, du.ing the NEm, the river su.ply of tu.bid water is relatively low occu.- ring in a period of relatively low intensity NEm winds that resu.t in relatively weaker sou.h flowing cu.rent that transports the sediment plu.e sou.hward. The mechanism of advection of the sediment plu.e north or sou.h of the estu.ry is mainly thou.ht to be du. to the Ekman transport generated by the onshore monsoon winds. Limited movement of the river sediment plu.e sou.hward towards Ras Vasco Da Gama du.ing NEm has ensu.ed that the coral reef ecosystem in the northern parts of malindi marine National Park has not been completely destroyed by the influ. of terrigenou. sediments. However, to the north there is no coral reef ecosystem. The high sediment discharge into malindi Bay can be attribu.ed to land u.e change in the Athi-Sabaki River Basin in addition to rapid popu.ation increase which has led to clearance of for

关键词： sediment plu.e monsoon winds longshore cu.rents Athi-Sabaki River malindi Bay Kenya

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Qu.ntu. cascade laser thermal therapy gu.ded by FDOCT

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Chinese Optics Letters 2013年第1期11卷 41-43页

作者：黄勇 Jin u. Kang Department of Electrical and Compu.er Engineering Johns Hopkins University

We demonstrate Fou.ier domain optical coherenc tomography （FDOCT） monitoring and gu.ding of qu.ntu. cascade laser （QCL） therapy. The laser therapy is performed with a 6.1-tim mid-IR QCL and it involves both tissu. coagu.ation or ablation. FDOCT allows real-time monitoring that minimize u.necessary damage to the su.rou.ding tissu.s. We perform lipid phantom tissu. ablation, chicken egg yolk coagu.ation, and tissu. and blood vessel coagu.ation on chicken embryo to validate the FDOCT gu.ding qu.ntu. cascade laser therapy.

关键词： QCL Qu.ntu. cascade laser thermal therapy gu.ded by FDOCT

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Stu.y of K^(*)(892)^(0)andФ(1020)meson produ.tion in proton–proton and Pb–Pb collisions at√S_(NN)=2.76 TeV

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Commu.ications in Theoretical Physics 2021年第2期73卷 89-95页

作者： Y Ali m Ahmed A Arif Q Ali u.Tabassam u.Ru.ab m Su.eymanov Department of Physics COMSATS UniversityPark RoadIslamabad44000Pakistan Institu.e for Physical Problems Baku Suate UniversityBakuAZ 1000Azrbajan

In this paper,we describe a stu.y of charged particle yield as a fu.ction of pT for K^(*)(892)0 and phgr(1020)mesons in proton–proton(pp)and Pb–Pb collisions at√S_(NN)=2.76 TeV in the central rapidity region of|y|mportant ratio,the nu.lear modification factor,to stu.y the effects of the mediu. in the most central region,i.e.0%–5%*** data simu.ation,we u.ed the EPOS-LHC and EPOS-1.99 *** check the validity of these models'simu.ations,we compared the data obtained from these monte Carlo simu.ation programs with ALICE experimental data for√S_(NN)=2.76 *** was conclu.ed that the models'predictions for the phgr-meson in pp and for the most central Pb-Pb collisions disagreed with the ALICE data,and that the difference increased with *** may be connected with the essential role of collective parton behaviors which cou.d not have been taken into accou.t by the *** K^(*)0 mesons,both programs gave almost the same predictions,and with pT in the interval pT>3 GeV c^(−1),the predictions were very close to the experimental *** models gave higher predictions for the soft pT interval and lower predictions for the hard *** valu.s of the RAA distribu.ions were lower than u.ity and both models were very close to the ALICE *** is very interesting that the models were not able to describe the pT distribu.ions,bu. they gave good predictions for their *** may possibly be du. to parton collective *** observed some additional su.pression of K^(*)0 at low valu.s of pT with respect to phgr-mesons,which may be related to the role of the masses of the particles in soft *** rising trend for R_(AA)in the region from pT=10 GeV c^(−1)to 20 GeV c^(−1) observed by the ALICE experiment was absent for theФ-mesons.

关键词： Qu.rk Glu.n Plasma EPOS-LHC nu.lear modification factor

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u.S. GEOLOGICAL Su.VEY PROGRAmS AND INVESTIGATIONS RELATED TO SOIL AND WATER CONSERVATION

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International Jou.nal of Sediment Research 2001年第3期16卷 421-429页

作者： W. R. OSTERKAmP and J. R. GRAY Research Hydrologist, u. S. Geological Su.vey, 1675 W. Anklam Road, Tu.son, AZ 85745 u. S. A. Hydrologist, u. S. Geological Su.vey, 415 National Center, Reston, VA 20192 u. S. A. Research Hydrologist U. S. Geological Survey 1675 W. Anklam Road Tucson AZ 85745 U. S. A Hydrologist U. S. Geological Survey 415 National Center Reston VA 20192 U. S. A

The u.S. Geological Su.vey has a rich tradition of collecting hydrologic data, especially for flu.es of water and su.pended sediment, that provide a fou.dation for stu.ies of soil and water conservation. Applied and basic research has inclu.ed investigations of the effects of land u.e on rangelands, croplands, and forests; hazards mapping; derivation of flood and drou.ht frequ.ncy, and other statistics related to streamflow and reservoir storage; development and application of models of rainfall-ru.off relations, chemical qu.lity, and sediment movement; and stu.ies of the interactive processes of overland and channel flow with vegetation. Networks of streamgaging stations and (or) sampling sites within nu.erou. drainage basins are yielding information that extends databases and enhances the ability to u.e those data for interpretive stu.ies.

关键词： Soil Water Sediment Erosion Conservation u. S. Geological Su.vey

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Polar Du.ls of Rotors

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Acta mathematica Sinica,English Series 1996年第1期12卷 40-42页

作者： Ghandehari m. Department of mathematics Noval Postgradu.te School monterey, CA 93943 u. S. A. Department of mathematics Noval Postgraduate School Monterey USA

Assu.e K is a rotor in a regu.ar simplex of heihgt 1 in an n-dimensional Eu.lidean space. Let K~* denote the polar du.l of K. Then the volu.e V(K~*) satisfies the inequ.lity V(K~*)≥(n+1)~nω_n, where ω_n denotes the volu.e of an n-dimensional u.it ball. Equ.lity holds if and only if K is a ball centered at the centroid of the simplex.

关键词： Rotor Polar du.l Regu.or Simplex

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microstru.tu.al Development of Ti-B Alloyed Layer for Hard Tissu. Applications

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Jou.nal of materials Science & Technology 2013年第6期29卷 565-572页

作者： A.miklaszewski m.u.Ju.czyk m.Ju.czyk Institu.e of materials Science and Engineering Poznan University of TechnologyM.Sklodowska-Curie 5 Sq.60-965 PoznanPoland mother's and Child's Health Division Poznan University of Medical SciencesPolna 3360-535 PoznanPoland

microstru.tu.al development was analyzed du. to the effect of different sizes of precu.sor powders du.ing su.face plasma alloying modification on titaniu. su.face. Ti-B nano and micropowders with 10 wt% B were deposited onto microcrystalline titaniu. su.strate by plasma alloying. As a resu.t, modified su.face layer composed of Ti matrix and TiB borides was obtained. The type of the powder precu.sor influ.nced recasting process, possible occu.rence of porosity and finally the obtained properties and microstru.tu.e of the su.face layer. Different morphologies and sizes of TiB phase from micro, su.micro to even nano increased the hardness and wear resistance of the obtained su.face layers. Discu.sed resu.ts referred to a strong TiB precipitation dispersion provided by a fine elements homogenization du.ing mechanical alloying process. Additionally, resu.ts of in vitro test with normal hu.an osteoblast cells revealed proper cellu.ar adhesion to modified su.faces. Scanning electron microscopy observation revealed the influ.nce of gas pore size on cu.tu.ing osteoblast colony. The proposed su.face alloying was an effective method of produ.ing TiB phase dispersed in α-Ti matrix with high hardness, good corrosion resistance and good cytocompatibility. Resu.ts confirmed that different types of the precu.sor powders influ.nced the properties of the su.face layer. TiB phase dispersed in α-Ti matrix layer can offer new stru.tu.al and biofu.ctional properties for innovative produ.ts in hard tissu. applications.

关键词： Titaniu. TiB phase Nano and micro precu.sors microstru.tu.e Corrosion resistance Cytocompatibility

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On the detection of closed orbits in time-dependent systems by u.ing dou.le-pu.se lasers

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Commu.ications in Theoretical Physics 2020年第9期72卷 111-117页

作者： S u.Khan m L Du Institu.e of Theoretical Physics Chinese Academy of Sciences.Beijing 100190China u.iversity of Chinese Academy of Sciences Beijing100049China

In the photodetachment of atoms or negative ions by a dou.le-pu.se laser, the first pu.se of the dou.le-pu.se laser generates waves and the delayed second pu.se may detect them. The phenomenon of the excitation and detection of waves by a dou.le-pu.se laser can be u.ed to identify the closed orbits in the system. We demonstrate this phenomenon with a negative hydrogen ion(H^-) by analyzing the total popu.ation excited by a dou.le-pu.se laser in a timedependent field for different physical parameters. By analyzing the total excited popu.ation u.ing a dou.le-pu.se laser, we can u.cover all the closed orbits existing in the system. We demonstrate that this can be realized by scanning the first pu.se position and the time delay between the two pu.ses.

关键词： dou.le-pu.se laser detection of closed orbits photodetachment spectra time-dependent systems

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