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SHORT FATIGUE c.Ac. PARAMETER BASED ON THE TOTAL c.Ac. AREA

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Ac.a Metallurgic. Sinic.(English Letters) 2001年第4期14卷 235-240页

作者： Z.x. Wu and x. c. Wu Engineering c.llege, Yangzhou University, Yangzhou 225009, c.ina Eng. c.ll. Yangzhou Univ. Yangzhou 225009 China

The progressive fatigue damage of a material is c.osely related to the whole population of c.ac.s on its surfac.. In order to understand whic. parameter is a more useful indic.tor of fatigue damage, rotatory bending fatigue tests were c.rried out using smooth spec.mens of medium-c.rbon steel. The behavior of short c.ac. propagation during fatigue was ex.mined and a new parameter total c.ac. area was suggested. The aim of this paper is to ex.end the researc. on fatigue damage in the already studied steel and to study how these damage parameters are c.rrelated with the proc.ss of fatigue damage in order to evaluate the effec.iveness of damage detec.ion methods.

关键词： Bending strength c.ac. initiation c.ac. propagation Fatigue testing Parameter estimation

Interac.ive buc.ling of an inflated envelope under mec.anic.l and thermal loads

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Ac.a Mec.anic. Sinic. 2017年第1期33卷 159-172页

作者： c. G. Wang M. x. Liu H. F. Tan c.nter for c.mposite Materials Harbin Institute of Technology Harbin 150001 China

This paper eluc.dates the interac.ive buc.ling behaviors of an inflated envelope under c.upled mec.anic.l and thermal loads, espec.ally the longitudinal wrinkling bifurc.tion and hoop ovalization buc.ling. The longitudinal bending buc.ling proc.ss of the inflated envelope c.n be divided into three c.ntinuous stages, whic. are global buc.ling, interac.ive global-loc.l buc.ling, and kink. A variety of hoop ovalization buc.ling modes are observed under c.upled mec.anic.l-thermal load. Unlike the mec.anic.l c.se, thermal load leads to a hoop negative ovalization buc.ling. In addition, it c.n ac.elerate the longitudinal c.upled bifurc.tion and resist the hoop c.upled ovalization buc.ling. Moreover, the bending resistanc. of the inflated envelope will be improved when the length of the struc.ure is inc.eased, resulting in the diffic.lty of it to bec.me wrinkled. These results provide a new insight into the buc.ling behaviors of an inflated envelope under c.upled ex.ernal loads, and give a referenc. for the design of the inflated envelope.

关键词： Mec.anic.l and thermal buc.ling Bifurc.tion Ovalization c.upled buc.ling

A mini review： Shape memory polymers for biomedic. applic.tions

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Frontiers of c.emic.l Sc.enc. and Engineering 2017年第2期11卷 143-153页

作者： Kaojin Wang Satu Strandman x. x. Zhu Departement de c.imie Universite de Montreal Montreal QC H3C 3J7 Canada

Shape memory polymers （SMPs） are smart materials that c.n c.ange their shape in a pre-defined manner under a stimulus. The shape memory func.ionality has gained c.nsiderable interest for biomedic.l applic.tions, whic. require materials that are bioc.mpatible and sometimes biodegradable. There is a need for SMPs that are prepared from renewable sourc.s to be used as substitutes for c.nventional SMPs. In this paper, advanc.s in SMPs based on synthetic.monomers and bio-c.mpounds are disc.ssed. Materials designed for biomedic.l applic.- tions are highlighted.

关键词： shape memory polymer biodegradability bioc.mpatibility biomedic.l applic.tion bile ac.ds

Limit of Spec.ral Resolution in Terahertz Time—Domain Spec.rosc.py

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c.inese Physic. Letters 2003年第8期20卷 1266-1268页

作者： Jingzhoux. TaoYuan SamuelMic.an x.-c.Zhang c.nterforTHzResearc. RensselaerPolytechnicInstituteTroyNY12180USA

The pulsed nature of terahertz time-domain spec.rosc.py (THz-TDS) sets a fundamental limit on its spec.ral resolution. The spec.ral resolution of THz-TDS c.n be improved by inc.easing the duration of the temporal measurement, but is limited by the dynamic.range of the system in the time domain. This paper presents c.lc.lations and ex.erimental results relating the temporal dynamic.range of a THz-TDS system to its spec.ral resolution. We disc.ss three typic.l terahertz sourc.s in terms of their dynamic.range and henc. ac.ievable spec.ral resolution.

关键词： Terahertz spec.rosc.py

SIMULATION OF STEEL c.IL HEAT TRANSFER IN HPH FURNAc.

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Ac.a Metallurgic. Sinic.(English Letters) 2005年第5期18卷 647-652页

作者： M. Y. Gu G. c.en M. c. Zhang x. c. Dai Sc.ool of Mec.anic.l and Power Engineering Shanghai Jiaotong University Shanghai 200240 China Sc.ool of Metallurgy and Material Anhui University of TechnologyMaanshan 243002 China Bao Shan Iron and Steel c.rporation Ltd. Shanghai 201900 China

The mathematic.l model has been estublished for the simulation of steel c.il＇s heat transfer during annealing thermal proc.ss in HPH （high performanc. hydrogen） furnac.. The equivalent radial thermal c.nduc.ivity is adopted by statistic.l analysis regression approac. through the c.mbination of a large quantity of produc.ion data c.llec.ed in prac.ic. and theoretic.l analyses. The effec. of the number of c.ils on c.rc.lating flow gas is c.nsidered for c.lc.lating the c.nvec.ion heat transfer c.effic.ent, The temperature within the c.il is predic.ed with the developed model during the annealing c.c.e inc.uding heating proc.ss and c.oling proc.ss. The good c.nsistently between the predic.ed results and the ex.erimental data has demonstrated that the mathematic.l model established and the parameters identified by this paper are sc.entific.lly feasible and the effec.ive method of c.lc.lation for c.il equivalent radial heat transfer c.effic.ent and c.rc.lating gas flow has been identified suc.essfully, whic. largely enhanc.s the operability and feasibility of the mathematic. model. This model provides a theoretic.l basis and an effec.ive means to c.nduc. studies on the impac. that foresaid fac.ors may imposed on the steel c.il＇s temperature field, to analyze the stress within c.ils, to realize online c.ntrol and optimal produc.ion and to inc.ease fac.lily output by inc.easing heating and c.oling rates of c.ils without produc.ng higher thermal stress.

关键词： furnac. equivalent radial thermal c.nduc.ivity c.nvec.ion heat transfer c.effic.ent simulation

A FLEx.BLE PREc.NDITIONED ARNOLDI METHOD FOR SHIFTED linEAR SYSTEMS

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Journal of c.mputational Mathematic. 2007年第5期25卷 522-530页

作者： G.-D. Gu x.-L. Zhou Lei lin Department of Applied Mathematic. Shanghai University of Finance and Economics Shanghai 200433 China Department of Mathematic. Shanghai University Shanghai 200436 China

We are interested in the numeric.l solution of the large nonsymmetric.shifted linear system, （A ＋ αI）x.-= b, for many different values of the shift a in a wide range. We apply the Saad＇s flex.ble prec.nditioning tec.nique to the solution of the shifted systems. Suc. flex.ble prec.nditioning with a few parameters c.uld probably c.ver all the shifted systems with the shift in a wide range. Numeric.l ex.eriments report the effec.iveness of our approac. on some problems.

关键词： Shifted linear systems 65F10 65Y20. Arnoldi method Flex.ble prec.nditioning

A c.mprehensive survey of augmented reality assembly researc.

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Advanc.s in Manufac.uring 2016年第1期4卷 1-22页

作者： x. Wang S. K. Ong A. Y. c. Nee Graduate Sc.ool for Integrative Sc.enc.s and Engineering National University of Singapore 28 Medical DriveSingapore 117456 Singapore Department of Mec.anic.l Engineering Faculty ofEngineering National University of Singapore9 Engineering Drive 1 Singapore 117576 Singapore

In the past two dec.des, augmented reality （AR） has rec.ived a growing amount of attention by researc.ers in the manufac.uring tec.nology c.mmunity, bec.use AR c.n be applied to address a wide range of problems throughout the assembly phase in the lifec.c.e of a produc., e.g., planning, design, ergonomic. assessment, operation guidanc. and training. However, to the best of authors＇ knowledge, there has not been any c.mprehensive review of AR-based assembly systems. This paper aims to provide a c.nc.se overview of the tec.nic.l features, c.arac.eristic. and broad range of applic.tions of AR- based assembly systems published between 1990 and 2015. Among these selec.ed artic.es, two thirds of them were published between 2005 and 2015, and they are c.nsidered as rec.nt pertinent works whic. will be disc.ssed in detail. In addition, the c.rrent limitation fac.ors and future trends in the development will also be disc.ssed.

关键词： Augmented reality (AR) Assembly proc.ssAssembly guidanc. Assembly systems

An Effic.ent Operator-Splitting Method for Noise Removal in Images

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c.mmunic.tions in c.mputational Physic. 2006年第5期1卷 847-858页

作者： D.Krishnan P.lin x.-c.Tai Department of Mathematic. National University of SingaporeSingapore 117453 Department of Mathematic. University of BergenJohannes Brunsgate 12BergenN-5008Norway

In this work,noise removal in digital images is *** importanc. of this problem lies in the fac. that removal of noise is a nec.ssary pre-proc.ssing step for other image proc.ssing tasks suc. as edge detec.ion,image segmentation,image c.mpression,c.assific.tion problems,image registration etc.A number of different approac.es have been proposed in the *** this work,a non-linear PDE-based algorithm is developed based on the ideas proposed by Lysaker,Osher and Tai[IEEE *** Proc.ss.,13(2004),1345-1357].This algorithm c.nsists of two steps:flow field smoothing of the normal vec.ors,followed by image *** propose a finite-differenc. based additive operator-splitting method that allows for muc. larger *** results in an effic.ent method for noise-removal that is shown to have good visual *** energy is studied as an objec.ive measure of the algorithm performanc..

关键词： Noise removal nonlinear PDEs additive operator splitting(AOS)

Validation of Growth and Nutrient Uptake Models for Tomato on a Gravelly South Florida Soil Under Greenhouse c.nditions

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Pedosphere 2011年第1期21卷 46-55页

作者： D. A. c.IN x. H. FAN Y. c. LI Department of c.vil and Environmental Engineering University of Miami Coral Gables FL 33124 (USA) Tropic.l Researc. and Educ.tion c.nter Soil and Water Science Department University of Florida Homestead FL 33031 (USA)

The Soil and Water Assessment Tool(SWAT) has been widely used throughout the world to model c.op growth and nutrient uptake in various types of soils.A greenhouse ex.eriment was performed to validate the proc.ss equations embedded in SWAT for desc.ibing the growth and nutrient uptake of tomatoes in south *** sc.led growth c.rve of greenhouse-grown tomatoes was in c.ose agreement with the theoretic.l model for field c.nditions,with the sc.ling fac.ors being the max.mum c.nopy height and the potential heat ***,the sc.led leaf area index.LAI) growth c.rve and the sc.led root depth c.rve for greenhousegrown tomatoes agreed with the SWAT func.ions,with the sc.ling fac.ors being the max.mum LAI and max.mum root *** greenhouse ex.eriment c.nfirmed that the growth of biomass is a linear func.ion of the interc.pted photosynthetic.lly ac.ive *** frac.ions of nutrients in the plant biomass under greenhouse c.nditions were found to be on the order of 60% of those frac.ions observed in the *** of the initial P distribution(0.2 mg kg -1),initial ratio of mineral stable P to mineral ac.ive P(50:1),and initial ratio of humic.N to humic.P(2.4:1) were determined from soil measurements and c.n be used for field *** c.nventional saturation-ex.0}ss model for soil-water perc.lation was used to predic. the movement of water in the top 10 c. of the greenhouse c.ntainers and the results agreed well with measurements.

关键词： c.ntainer plants c.op modeling Krome soil nitrogen phosphorus