Philosophical Magazine Part B最新文献_第7页

Dynamic triangulations for efficient detection of collisions between spheres with applications in granular media simulations 有效检测球体碰撞的动态三角测量及其在颗粒介质模拟中的应用

Philosophical Magazine Part B Pub Date : 2002-05-01 DOI: 10.1080/13642810208218352

J. Ferrez, Th.M. Lieblin3g

{"title":"Dynamic triangulations for efficient detection of collisions between spheres with applications in granular media simulations","authors":"J. Ferrez, Th.M. Lieblin3g","doi":"10.1080/13642810208218352","DOIUrl":"https://doi.org/10.1080/13642810208218352","url":null,"abstract":"Abstract The distinct element method (DEM) is an approach to modelling and simulation well suited to the study of discontinuous phenomena. By tracking each element individually and dealing explicitly with every interaction among the elements, the DEM allows one to deduce statistical behaviour of the assembly. Realistic simulation of granular materials has largely benefited from this relatively recent approach. In particular, it is now possible to address specific phenomena such as arching effects, flows and packings in three dimensions and to make them observable, which is impossible or at least extremely complicated to achieve with physical experiments. Two major issues arise in the context of DEM: efficient detection of the interactions between the grains and numerical modelling of the physical contacts. This paper focuses on the former by presenting an efficient collision detection scheme for spherical grains of various sizes based on a dynamic three-dimensional Delaunay triangulation. Aside from the theoretical and practical discussion of this scheme, the remaining requirements for a complete DEM simulation are also addressed. Finally, examples are given to illustrate the potential of this approach.","PeriodicalId":20016,"journal":{"name":"Philosophical Magazine Part B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91053987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

High-field properties of single-crystal CaVO3 单晶CaVO3的高场性质

Philosophical Magazine Part B Pub Date : 2002-05-01 DOI: 10.1080/13642810208224370

M. Jung, I. Inoue, H. Nakotte, A. Lacerda

引用次数: 3

Strongly correlated electron behaviour in the compound CeRhSn 复合CeRhSn中的强相关电子行为

Philosophical Magazine Part B Pub Date : 2002-05-01 DOI: 10.1080/13642810208218354

A. Ślebarski, M. Maple, E. J. Freeman, C. Sirvent, M. Radłowska, A. Jezierski, E. Granado, Q. Huang, J. W. Lynn

引用次数: 15

Thermodynamics of a higher-order phase transition: Scaling exponents and scaling laws 高阶相变热力学:标度指数和标度定律

Philosophical Magazine Part B Pub Date : 2002-04-30 DOI: 10.1080/13642810210127011

P. Kumar, A. Saxena

引用次数: 7

On the optical absorption and nonlinearity of silica films containing metal nanoparticles 含金属纳米颗粒二氧化硅薄膜的光吸收和非线性

Philosophical Magazine Part B Pub Date : 2002-04-01 DOI: 10.1080/13642810208224363

E. Cattaruzza, G. Battaglin, F. Gonella, R. Polloni, G. Mattei, C. Maurizio, P. Mazzoldi, C. Sada, M. Montagna, C. Tosello, M. Ferrari

引用次数: 22

Planar waveguides for integrated optics prepared by sol–gel methods 溶胶-凝胶法制备集成光学平面波导

Philosophical Magazine Part B Pub Date : 2002-04-01 DOI: 10.1080/13642810208224361

R. Almeida, P. J. Morais, A. Marques

{"title":"Planar waveguides for integrated optics prepared by sol–gel methods","authors":"R. Almeida, P. J. Morais, A. Marques","doi":"10.1080/13642810208224361","DOIUrl":"https://doi.org/10.1080/13642810208224361","url":null,"abstract":"Abstract Sol-gel processing is becoming one of the cheapest and most versatile methods for the fabrication of passive and active planar waveguides for integrated optics, in particular for the silica-on-silicon type. The present paper focuses on some recent work in our group on both passive and active (Er3+-doped) silica–titania inorganic and hybrid waveguides, considering in detail their densification behaviour, structure and optical properties. Recent advanced topics, such as nanocrystalline active waveguides prepared by by sol–gel method, are also addressed. The main results to be presented will deal first with the structural evolution during the densification of inorganic and hybrid silica-titania waveguides. Then, the fluorescence behaviour of active waveguides, doped with Er3+ ions, will also be described. And finally silver co-doped nanocrystalline waveguides, will be considered in detail, with particular emphasis on, firstly, the influence of preparation conditions on optical properties such as the visible and infrared absorption spectra, including the characterization of the surface plasmon resonances of the silver nanoparticles by visible spectroscopy as well as the 1.5 μm fluorescence lifetime and, secondly, the nature of the chemical environment of the erbium and silver ions, before the thermally induced nanocrystallite precipitation and during the course of film densification.","PeriodicalId":20016,"journal":{"name":"Philosophical Magazine Part B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87481132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Rare-earth-doped glasses and ion-exchanged integrated optical amplifiers and lasers 稀土掺杂玻璃和离子交换集成光放大器和激光器

Philosophical Magazine Part B Pub Date : 2002-04-01 DOI: 10.1080/13642810208224362

G. Righini, M. Brenci, M. A. Forastiere, S. Pelli, G. Ricci, G. N. Conti, N. Peyghambarian, M. Ferrari, M. Montagna

引用次数: 26

High-pressure Brillouin scattering from vitreous(Y2O3)0.27(P2O5)0.73 玻璃(Y2O3)0.27(P2O5)0.73的高压布里渊散射

Philosophical Magazine Part B Pub Date : 2002-04-01 DOI: 10.1080/13642810208224365

O. Pilla, A. Fontana, P. Freire, A. Teixeira

引用次数: 0

Between glass and crystal: Glass–ceramics, a new way for optical materials 介于玻璃与晶体之间:玻璃陶瓷——光学材料的新途径

Philosophical Magazine Part B Pub Date : 2002-04-01 DOI: 10.1080/13642810208224364

M. Mortier

引用次数: 29

Pressure and temperature dependences of the dynamics of glass formers studied by broad-band dielectric spectroscopy 用宽频带介电光谱研究成玻璃动力学的压力和温度依赖性

Philosophical Magazine Part B Pub Date : 2002-04-01 DOI: 10.1080/13642810208224356

S. Capaccioli, M. Lucchesi, R. Casalini, S. Presto, P. Rolla, M. T. Viciosa, S. Corezzi, D. Fioretto

{"title":"Pressure and temperature dependences of the dynamics of glass formers studied by broad-band dielectric spectroscopy","authors":"S. Capaccioli, M. Lucchesi, R. Casalini, S. Presto, P. Rolla, M. T. Viciosa, S. Corezzi, D. Fioretto","doi":"10.1080/13642810208224356","DOIUrl":"https://doi.org/10.1080/13642810208224356","url":null,"abstract":"Abstract The pressure and temperature behaviours of the structural relaxation time in glass-forming systems can be well described by a new equation, based on the Adam-Gibbs model, where the configurational entropy has been written in terms of the excess heat capacity and the molar thermal expansion. An experimental check of this equation was performed on the dynamics of an epoxy compound, investigated by wide-band dielectric spectroscopy (10−2–1010Hz). Six different sets of relaxation data, corresponding to two different conditions, were analysed: firstly, isobaric (atmospheric pressure and 95.5 MPa) with various temperatures down to the supercooled and glassy phases and, secondly, isothermal (at four different temperatures) with changing pressure in the range 0.1–270 MPa. Moreover, the thermal expansion was independently determined from data on the pressure and temperature variations of the volume of the material. From this analysis, the pressure-extended Adam-Gibbs model resulted, which is so suitable for describing the two-dimensional surface τ(T,P) over the whole investigated range of temperatures and pressures that a master curve can be obtained from all the relaxation times if plotted versus a variable related to the configurational entropy directly derived from thermodynamic data.","PeriodicalId":20016,"journal":{"name":"Philosophical Magazine Part B","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79793951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8