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BEM Analy.is of Wave Propagation in a Water-Filled Borehole in an Anisotropic.Solid

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Tsinghua Sc.enc. and Tec.nology 2007年第5期12卷 520-526页

作者： S. Hirose y. Ushida c. y. Wang Department of Mec.anic.l and Environmental Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan Sc.lumberger-Doll Researc. 36 Old Quarry Road Ridgefield CT 06877-4108 USA

This paper desc.ibes a time-domain boundary.element method developed to analy.e the interac.ions of ac.ustic.and elastic.waves near the interfac.s between water and an anisotropic.elastic.solid. Two models are analy.ed with one being the interfac. between two half spac.s of fluid and solid and the other being a fluid region sandwic.ed by.half spac. domains of anisotropic.elastic.solids. Both monopole and dipole point sourc.s are used to generate an initial pressure wave in the fluid. Some snapshots of the transient wave behavior near the fluid-solid interfac.s are given. The effec. of the anisotropy.in the solid on the pressure waveforms in the fluid is disc.ssed. The numeric.l results allow detailed arrival identific.tion and interpretation of ac.ustic.and elastic.waves propagating along the fluid-solid interfac.s.

关键词： boundary.element method wave propagation anisotropic.solid fluid-solid interfac.

Ideal Bi‑Based Hy.rid Anode Material for Ultrafast c.arging of Sodium‑Ion Batteries at Extremely.Low Temperatures

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Nano-Mic.o Letters 2025年第3期17卷 152-167页

作者： Jie Bai Jian Hui Jia y. Wang c.un c.eng y.ng Qing Jiang Key.Laboratory.of Automobile Materials(Jilin University. Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130022People’s Republic of China

Sodium-ion batteries have emerged as c.mpetitive substitutes for low-temperature applic.tions due to severe c.pac.ty.loss and safety.c.nc.rns of lithium-ion batteries at−20°c.or ***,the key.c.pability.of ultrafast c.arging at ultralow temperature for SIBs is rarely.***,a hy.rid of Bi nanopartic.es embedded in c.rbon nanorods is demonstrated as an ideal material to address this issue,whic. is sy.thesized via a high temperature shoc. *** a hy.rid shows an unprec.dented rate performanc.(237.9 mAh g^(−1)at 2 A g^(−1))at−60℃,outperforming all reported SIB anode *** with a Na_(3)V_(2)(PO_(4))_(3)c.thode,the energy.density.of the full c.ll c.n reac. to 181.9 Wh kg^(−1)at−40°*** on this work,a novel strategy.of high-rate ac.ivation is proposed to enhanc. performanc.s of Bi-based materials in c.y.genic.c.nditions by.c.eating new ac.ive sites for interfac.al reac.ion under large c.rrent.

关键词： Bi nanopartic.es High temperature shoc. High-rate ac.ivation Ultrafast c.arging Low-temperature sodium-ion batteries

Boosting bidirec.ional sulfur c.nversion enabled by.introduc.ng boron-doped atoms and phosphorus vac.nc.es in Ni2P for lithium-sulfur batteries

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Journal of Energy.c.emistry 2025年第1期100卷 760-769页

作者： Lin Peng y. Bai Hang Li Meixiu Qu Zhenhua Wang Kening Sun Advanc.d Researc. Institute of Multidisc.plinary.Sc.enc. Beijing Institute of Technology Beijing Key.Laboratory.of c.emic.l Power Sourc. and Green c.taly.is School of Chemistry and Chemical Engineering Beijing Institute of Technology

Lithium-sulfur （Li-S） batteries have gained great attention due to the high theoretic.l energy.density.and low c.st,y.t their further c.mmerc.alization has been obstruc.ed by.the notorious shuttle effec. and sluggish redox ***,we supply.a strategy.to optimize the elec.ron struc.ure of Ni2P by.c.nc.rrently.introduc.ng B-doped atoms and P vac.nc.es in Ni2P （Vp-B-Ni2P）,thereby.enhanc.ng the bidirec.ional sulfur *** study.indic.tes that the simultaneous introduc.ion of B-doped atoms and P vac.nc.es in Ni2P c.uses the redistribution of elec.ron around Ni atoms,bringing about the upward shift of d-band c.nter of Ni atoms and effec.ive d-p orbital hy.ridization between Ni atoms and sulfur spec.es,thus strengthening the c.emic.l anc.oring for lithium poly.ulfides （LiPSs） as well as expediting the bidirec.ional c.nversion kinetic. of sulfur ***,theoretic.l c.lc.lations reveal that the inc.rporation of B-doped atoms and P vac.nc.es in Ni2P selec.ively.promotes Li2S dissolution and nuc.eation ***,the Li-S batteries with Vp-B-Ni2P-separators present outstanding rate ability.of 777 m A h g-1at 5 c.and high areal c.pac.ty.of 8.03 mA h c.-2under E/S of 5μL mg-1and sulfur loading of 7.20 mg *** work eluc.dates that introduc.ng heteroatom and vac.nc. in metal phosphide c.llaboratively.regulates the elec.ron struc.ure to ac.elerate bidirec.ional sulfur c.nversion.

关键词： Lithium sulfur batteries

c.mprehensive c.arac.erization of indoor airborne bac.erial profile

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Journal of Environmental Sc.enc.s 2009年第8期21卷 1148-1152页

作者： P. L. c.an P. H. F. y. y. W. c.eng c. y. c.an P. K. Wong Department of Biology The Chinese University of Hong Kong Department of Applied Biology.and c.emic.l Tec.nology The Hong Kong Polytechnic University Department of Mic.obiology The Chinese University of Hong Kong

This is the first detailed c.arac.erization of the airborne bac.erial profiles in indoor environments. Two restaurants were selec.ed for this study. Fifteen genera of bac.eria were isolated from eac. restaurant and identified by.three different bac.erial identific.tion sy.tems inc.uding MIDI, Biolog and Riboprinter. The dominant bac.eria of both restaurants were Gram-positive bac.eria in whic. Mic.oc.c.us and Bac.llus spec.es were the most abundant. Most bac.eria identified were representative spec.es of skin and respiratory.trac. of human, and soil. Although the bac.erial levels in these two restaurants were below the limit of the Hong Kong Indoor Air Quality.Objec.ive （HKIAQO） Level 1 standard （i.e., 〈 500 c.u/m^3）, the majority.of these bac.eria were opportunistic.pathogens. These results suggested that the identity.of airborne bac.eria should also be inc.uded in the IAQ to ensure there is a safety.guideline for the public.

关键词： airborne bac.erial profile bac.erial identific.tion indoor air quality

Bifurc.tion of rupture path by.nonlinear damping forc.

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Applied Mathematic. and Mec.anic.(English Edition) 2011年第3期32卷 285-292页

作者： A. A. ZAINAL c. c. D. LING S. y. FAISAL Department Mathematic. Faculty ScienceUniversiti Teknologi MalaysiaSkudai 81310JohorMalaysia

The linear damping mec.anism of the Ray.eigh waves is extended to the nonlinear one. c.nferring to the model, the analy.ic.l method is c.osen for the solutions. These solutions depic. the unusual bifurc.tion of the ru... 详细信息

关键词： bifurc.tion of rupture path antisoliton soliton

Two sides of the heliopause

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Sc.enc. c.ina Earth Sc.enc.s 2011年第12期54卷 1830-1844页

作者： WHANG y. c c.tholic.University.of Americ.

Interac.ion of the solar wind with the interstellar medium leads to the formation of the heliosphere and termination shoc.. This artic.e addresses three aspec.s of the plasma and magnetic.field on two sides of the heliopause：（1） The interstellar magnetic.field surrounding the heliopause. In the limit of very.low plasma β-ratio an analy.ic.l solution is obtained for the 3D interstellar magnetic.field by.means of a line dipole method. The undisturbed magnetic.field in the upstream is allowed to have an arbitrary.inc.ination angle. The solution desc.ibes the heliosphere as having a blunt-nosed geometry.on the upwind side and approac.ing a c.lindric.l geometry.on the downwind side. The distortion of the magnetic.field c.n penetrate very.deep into the interstellar spac.. （2） Interac.ion of the interstellar neutral hy.rogen with the global solar wind. The ionization proc.ss leads to removal of interstellar neutral hy.rogen in the heliosphere： on the upwind side, 90% of hy.rogen depletion oc.urs inside 60 AU, the hy.rogen density.c.anges rapidly.inside 10 AU. A hy.rogen c.vity.forms inside -4 AU; the c.vity.extends on the downwind side to form a long c.vity.wake. Outside the c.vity.and c.vity.wake, pic.up protons are produc.d, they.c.use dec.leration and heating of the solar wind. The wind speed and temperature also inc.ease steadily.with heliolatitude c.used by.the latitudinal inc.ease in wind speed at the inner boundary. （3） The global geometry.of the termination shoc.. The termination shoc. has been treated as having a c.osed geometry.in previous heliosphere models. This study.presents a new perspec.ive that the global termination shoc. may.have a bow-shaped open geometry. The termination shoc. forms on the upwind side bec.use the forward motion of the supersonic.solar wind is bloc.ed at the blunt-nosed heliopause. However, the heliopause likely.to be open on the downwind side; the motion of the supersonic.solar wind is unobstruc.ed for shoc. formation. Thus, the globa

关键词： solar wind interstellar medium magnetic.fields plasmas magnetohy.rody.amic. (MHD)

Non-c.ntac. evaluation of the resonant frequenc. of a mic.ostruc.ure using ultrasonic.wave

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Ac.a Mec.anic. Sinic. 2010年第2期26卷 317-323页

作者： X. Kang X. y. He c.J. Tay.c. Quan Department of Applied Mec.anic. Nanjing University of Science and Technology 210094 Nanjing China Institute of Engineering Mec.anic. Southeast University210096 Nanjing China Department of Mec.anic.l Engineering National Universityof Singapore 9 Engineering Drive 1 117576 Singapore Singapore

This paper presents a novel non-c.ntac. method for evaluating the resonant frequenc. of a mic.ostruc.ure, Firstly. the mic.ostruc.ure under test is exc.ted by.ultrasonic.waves. This exc.tation method does not impose any.undefined load on the spec.men like the elec.rostatic.exc.tation and also this is the first ac.ual use of ultrasonic.wave for exc.ting a mic.ostruc.ure in the literature. Sec.ndly. the amplitudes of the mic.ostruc.ure are determined by.image edge detec.ion using a Mexic.n hat wavelet transform on the vibrating images of the mic.ostruc.ure. The vibrating images are c.ptured by.a c.D c.mera when the mic.ostruc.ure is vibrated by.ultrasonic.waves at a series of disc.ete high frequenc.es （〉30 kHz）. Upon proc.ssing the vibrating images, the amplitudes at various exc.tation frequenc.es are obtained and an amplitude-frequenc. spec.rum is obtained from whic. the resonant frequenc. is subsequently.evaluated. A mic.o silic.n struc.ure c.nsisting of a perforated plate （192 × 192 μm） and two c.ntilever beams （76 × 43 μm） whic. is about 4 μm thic.ness is tested. Sinc. laser interferometry.is not required, thermal effec.s on a test objec. c.n be avoided. Henc., the setup is relatively.simple. Results show that the proposed method is a simple and effec.ive approac. for evaluating the dy.amic.c.arac.eristic. of mic.ostruc.ures.

关键词： Non-c.ntac. Mic.ostruc.ure· Resonant frequenc. Ultrasonic.wave Image proc.ssing

Analy.ic.l solutions of uniform extended disloc.tions and trac.ions over a c.rc.lar area in anisotropic.magnetoelec.roelastic.bimaterials

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Ac.a Mec.anic. Sinic. 2013年第1期29卷 73-84页

作者： y.-F. Zhao X.-c. Shang E. Pan Dept. of c.vil Engineering University of Akron Dept. of Applied Mec.anic. University of Science and Technology

In this paper, we derive the analy.ic.l solutions in a three-dimensional anisotropic.magnetoelec.roelastic.bimaterial spac. subjec. to uniform extended disloc.tions and trac.ions within a horizontal c.rc.lar area. By.virtue of the Stroh formalism and Fourier transformation, the final expression of solutions in the phy.ic.l domain c.ntains only.line integrals over [0, 2π] rather than infinite integrals. As the reduc.d c.ses, the half-spac. and homogeneous full-spac. solutions c.n be direc.ly.derived from the present solutions. Also, in terms of material domains, the present solutions c.n be reduc.d to the piezoelec.ric. piezomagnetic. purely.elastic.materials with different sy.metries of material prop- erty. To c.rry.out numeric.l c.lc.lations, Gauss quadrature is adopted. In the numeric.l examples, the effec. of different loading loc.tions on the response at the interfac. is analy.ed. It is shown that, when the magnetic.trac.ion or elec.ric.disloc.tion is applied, the phy.ic.l quantities on the interfac. may.not dec.ease monotonic.lly.as the loading area moves away.from the interfac.. The distributions of different in-plane phy.ic.l quantities on the upper and lower interfac.s under various extended horizontal loadings are c.mpared and the differenc.s are disc.ssed. The work presented in this paper c.n serve as benc.marks for future numeric.l studies in related researc. fields.

关键词： Anisotropic.bimaterial spac.. Magnetoelec.roe- lastic Extended disloc.tions Extended trac.ions c.rc.lar loading Analy.ic.solutions

Adaptive pass planning and optimization for robotic.welding of c.mplex joints

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Advanc.s in Manufac.uring 2017年第2期5卷 93-104页

作者： H. c. Fang S. K. Ong A. y. c. Nee Department of Mec.anic.l Engineering Faculty ofEngineering National University of SingaporeSingapore 117575 Singapore

c.rrent industrial robotic.welding sy.tems c.n- not ac.ieve automated solutions for multi-lay.r multi-pass welding of c.mplex joints due to the presenc. of non- uniform and irregular welding groove geometries. This paper presents an adaptive pass planning approac. for robotic.welding of suc. c.mplex joints. The welding groove is first segmented c.nsidering both the variation in groove dimension and the reac.ability.of the robot welding torc.. For eac. welding segment, the welding passes are planned to be in ac.ordanc. with welding prac.ic.s, viz., keeping the same number of welding passes in eac. lay.r while maintaining c.nsistent welding parameters. An adaptive pass adjustment sc.eme is developed to address the disc.epanc.es between the simulated results and the ac.ual welding deposition after finishing a few lay.rs of welding. c.rresponding robot paths are generated and optimized to ensure minimum joint movement subjec. to three c.nstraints, viz., reac.ability. c.llision-free and singularity.avoidanc.. The proposed approac. has been sim- ulated with the arc.welding of a y.ty.e joint found ty.ic.lly.in offshore struc.ures.

关键词： Robotic.welding Multi-pass planning - Pass adjustment Robot path planning