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IEEE International Conference on Robotics and Automation (ICRA)

作者： Asimina Kazakidi Vasileios Vavourakis Nikolaos Pateromichelakis John A. Ekaterinaris Dimitris P. Tsakiris Institute of Computer Science Foundation for Research & Technology - Hellas (FORTH) GR 70013 Heraklion Greece Institute of Applied & Computational Mathematics Foundation for Research & Technology - Hellas (FORTH) GR 70013 Heraklion Greece

We consider robotic analogues of the arms of the octopus, a cephalopod exhibiting a wide variety of dexterous movements and complex shapes, moving in an aquatic environment. Although an invertebrate, the octopus can vary the stiffness of its long arms and generate large forces, while also performing rapid motions within its aquatic environment. Previous studies of elongated robotic systems, moving in fluid environments, have mostly oversimplified the effects of flow and the generated hydrodynamic forces, in their dynamical models. The present paper uses computational fluid dynamic (CFD) analysis to perform high-fidelity numerical simulations of robotic prototypes emulating the morphology of octopus arms. The direction of the flow stream and the arm geometry (e.g., the presence of suckers), were among the parameters that were shown to affect significantly the flow field structure and the resulting hydrodynamic forces, which have a non-uniform distribution along the arm. The CFD results are supported by vortex visualization experiments in a water tank. The results of this investigation are being exploited for the design of soft-bodied robotic systems and the development of related motion control strategies.

关键词： Geometry Force Hydrodynamics Drag Face Manipulators

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Multiparticle azimuthal correlations in p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider

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Physical Review C 2014年第5期90卷 054901-054901页

作者： B. Abelev J. Adam D. Adamová M. M. Aggarwal G. Aglieri Rinella M. Agnello A. Agostinelli N. Agrawal Z. Ahammed N. Ahmad I. Ahmed S. U. Ahn S. A. Ahn I. Aimo S. Aiola M. Ajaz A. Akindinov S. N. Alam D. Aleksandrov B. Alessandro D. Alexandre A. Alici A. Alkin J. Alme T. Alt S. Altinpinar I. Altsybeev C. Alves Garcia Prado C. Andrei A. Andronic V. Anguelov J. Anielski T. Antičić F. Antinori P. Antonioli L. Aphecetche H. Appelshäuser S. Arcelli N. Armesto R. Arnaldi T. Aronsson I. C. Arsene M. Arslandok A. Augustinus R. Averbeck T. C. Awes M. D. Azmi M. Bach A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala A. Baldisseri F. Baltasar Dos Santos Pedrosa R. C. Baral R. Barbera F. Barile G. G. Barnaföldi L. S. Barnby V. Barret J. Bartke M. Basile N. Bastid S. Basu B. Bathen G. Batigne A. Batista Camejo B. Batyunya P. C. Batzing C. Baumann I. G. Bearden H. Beck C. Bedda N. K. Behera I. Belikov F. Bellini R. Bellwied E. Belmont-Moreno R. Belmont, III V. Belyaev G. Bencedi S. Beole I. Berceanu A. Bercuci Y. Berdnikov D. Berenyi M. E. Berger R. A. Bertens D. Berzano L. Betev A. Bhasin I. R. Bhat A. K. Bhati B. Bhattacharjee J. Bhom L. Bianchi N. Bianchi C. Bianchin J. Bielčík J. Bielčíková A. Bilandzic S. Bjelogrlic F. Blanco D. Blau C. Blume F. Bock A. Bogdanov H. Bøggild M. Bogolyubsky F. V. Böhmer L. Boldizsár M. Bombara J. Book H. Borel A. Borissov F. Bossú M. Botje E. Botta S. Böttger P. Braun-Munzinger M. Bregant T. Breitner T. A. Broker T. A. Browning M. Broz E. Bruna G. E. Bruno D. Budnikov H. Buesching S. Bufalino P. Buncic O. Busch Z. Buthelezi D. Caffarri X. Cai H. Caines L. Calero Diaz A. Caliva E. Calvo Villar P. Camerini F. Carena W. Carena J. Castillo Castellanos E. A. R. Casula V. Catanescu C. Cavicchioli C. Ceballos Sanchez J. Cepila P. Cerello B. Chang S. Chapeland J. L. Charvet S. Chattopadhyay V. Chelnokov M. Cherney C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato P. Chochula M. Chojnacki S. Choudhury P. Christakoglou C. H. Christensen P. Christiansen T. Chujo S. U. Chung C. Cicalo L. Cifa Lawrence Livermore National Laboratory Livermore California USA Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic Nuclear Physics Institute Academy of Sciences of the Czech Republic Řež u Prahy Czech Republic Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Sezione INFN Turin Italy Politecnico di Torino Turin Italy Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy Indian Institute of Technology Bombay (IIT) Mumbai India Variable Energy Cyclotron Centre Kolkata India Department of Physics Aligarh Muslim University Aligarh India COMSATS Institute of Information Technology (CIIT) Islamabad Pakistan Korea Institute of Science and Technology Information Daejeon South Korea Yale University New Haven Connecticut USA Institute for Theoretical and Experimental Physics Moscow Russia Russian Research Centre Kurchatov Institute Moscow Russia School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Centro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” Rome Italy Sezione INFN Bologna Italy Bogolyubov Institute for Theoretical Physics Kiev Ukraine Faculty of Engineering Bergen University College Bergen Norway Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Department of Physics and Technology University of Bergen Bergen Norway V. Fock Institute for Physics St. Petersburg State University St. Petersburg Russia Universidade de São Paulo (USP) São Paulo Brazil National Institute for Physics and Nuclear Engineering Bucharest Romania Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institut für Kernphysik Westfälische Wilhelms-Universität Münst

Measurements of multiparticle azimuthal correlations (cumulants) for charged particles in p-Pb at sNN=5.02 TeV and Pb-Pb at sNN=2.76 TeV collisions are presented. They help address the question of whether there is evidence for global, flowlike, azimuthal correlations in the p-Pb system. Comparisons are made to measurements from the larger Pb-Pb system, where such evidence is established. In particular, the second harmonic two-particle cumulants are found to decrease with multiplicity, characteristic of a dominance of few-particle correlations in p-Pb collisions. However, when a |Δη| gap is placed to suppress such correlations, the two-particle cumulants begin to rise at high multiplicity, indicating the presence of global azimuthal correlations. The Pb-Pb values are higher than the p-Pb values at similar multiplicities. In both systems, the second harmonic four-particle cumulants exhibit a transition from positive to negative values when the multiplicity increases. The negative values allow for a measurement of v2{4} to be made, which is found to be higher in Pb-Pb collisions at similar multiplicities. The second harmonic six-particle cumulants are also found to be higher in Pb-Pb collisions. In Pb-Pb collisions, we generally find v2{4}≃v2{6}≠0 which is indicative of a Bessel-Gaussian function for the v2 distribution. For very high-multiplicity Pb-Pb collisions, we observe that the four- and six-particle cumulants become consistent with 0. Finally, third harmonic two-particle cumulants in p-Pb and Pb-Pb are measured. These are found to be similar for overlapping multiplicities, when a |Δη|>1.4 gap is placed.

关键词： HEAVY ion collisions LEAD isotopes MULTIPARTICLE spectrometers CUMULANTS QUANTUM correlations QUARK-gluon plasma

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Azimuthal anisotropy of D-meson production in Pb-Pb collisions at sNN=2.76 TeV

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Physical Review C 2014年第3期90卷 034904-034904页

作者： B. Abelev J. Adam D. Adamová M. M. Aggarwal M. Agnello A. Agostinelli N. Agrawal Z. Ahammed N. Ahmad I. Ahmed S. U. Ahn S. A. Ahn I. Aimo S. Aiola M. Ajaz A. Akindinov S. N. Alam D. Aleksandrov B. Alessandro D. Alexandre A. Alici A. Alkin J. Alme T. Alt S. Altinpinar I. Altsybeev C. Alves Garcia Prado C. Andrei A. Andronic V. Anguelov J. Anielski T. Antičić F. Antinori P. Antonioli L. Aphecetche H. Appelshäuser S. Arcelli N. Armesto R. Arnaldi T. Aronsson I. C. Arsene M. Arslandok A. Augustinus R. Averbeck T. C. Awes M. D. Azmi M. Bach A. Badalà Y. W. Baek S. Bagnasco R. Bailhache R. Bala A. Baldisseri F. Baltasar Dos Santos Pedrosa R. C. Baral R. Barbera F. Barile G. G. Barnaföldi L. S. Barnby V. Barret J. Bartke M. Basile N. Bastid S. Basu B. Bathen G. Batigne A. Batista Camejo B. Batyunya P. C. Batzing C. Baumann I. G. Bearden H. Beck C. Bedda N. K. Behera I. Belikov F. Bellini R. Bellwied E. Belmont-Moreno R. Belmont, III V. Belyaev G. Bencedi S. Beole I. Berceanu A. Bercuci Y. Berdnikov D. Berenyi M. E. Berger R. A. Bertens D. Berzano L. Betev A. Bhasin I. R. Bhat A. K. Bhati B. Bhattacharjee J. Bhom L. Bianchi N. Bianchi C. Bianchin J. Bielčík J. Bielčíková A. Bilandzic S. Bjelogrlic F. Blanco D. Blau C. Blume F. Bock A. Bogdanov H. Bøggild M. Bogolyubsky F. V. Böhmer L. Boldizsár M. Bombara J. Book H. Borel A. Borissov F. Bossú M. Botje E. Botta S. Böttger P. Braun-Munzinger M. Bregant T. Breitner T. A. Broker T. A. Browning M. Broz E. Bruna G. E. Bruno D. Budnikov H. Buesching S. Bufalino P. Buncic O. Busch Z. Buthelezi D. Caffarri X. Cai H. Caines L. Calero Diaz A. Caliva E. Calvo Villar P. Camerini F. Carena W. Carena J. Castillo Castellanos E. A. R. Casula V. Catanescu C. Cavicchioli C. Ceballos Sanchez J. Cepila P. Cerello B. Chang S. Chapeland J. L. Charvet S. Chattopadhyay V. Chelnokov M. Cherney C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato P. Chochula M. Chojnacki S. Choudhury P. Christakoglou C. H. Christensen P. Christiansen T. Chujo S. U. Chung C. Cicalo L. Cifarelli F. Cindolo J. Lawrence Livermore National Laboratory Livermore California USA Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic Nuclear Physics Institute Academy of Sciences of the Czech Republic Řež u Prahy Czech Republic Physics Department Panjab University Chandigarh India Sezione INFN Turin Italy Politecnico di Torino Turin Italy Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy Indian Institute of Technology Bombay (IIT) Mumbai India Variable Energy Cyclotron Centre Kolkata India Department of Physics Aligarh Muslim University Aligarh India COMSATS Institute of Information Technology (CIIT) Islamabad Pakistan Korea Institute of Science and Technology Information Daejeon South Korea Yale University New Haven Connecticut USA Institute for Theoretical and Experimental Physics Moscow Russia Russian Research Centre Kurchatov Institute Moscow Russia School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi ” Rome Italy Sezione INFN Bologna Italy Bogolyubov Institute for Theoretical Physics Kiev Ukraine Faculty of Engineering Bergen University College Bergen Norway Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Department of Physics and Technology University of Bergen Bergen Norway V. Fock Institute for Physics St. Petersburg State University St. Petersburg Russia Universidade de São Paulo (USP) São Paulo Brazil National Institute for Physics and Nuclear Engineering Bucharest Romania Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany Institut für Kernphysik Westfälische Wilhelms-Universität Münster Münster Germany Rudjer Bošković Institute Zagreb Croatia Sezione I

The production of the prompt charmed mesons D0, D+, and D*+ relative to the reaction plane was measured in Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon collision of sNN=2.76TeV with the ALICE detector at the CERN Large Hadron Collider. D mesons were reconstructed via their hadronic decays at central rapidity in the transverse-momentum (pT) interval 2–16 GeV/c. The azimuthal anisotropy is quantified in terms of the second coefficient v2 in a Fourier expansion of the D-meson azimuthal distribution and in terms of the nuclear modification factor RAA, measured in the direction of the reaction plane and orthogonal to it. The v2 coefficient was measured with three different methods and in three centrality classes in the interval 0%–50%. A positive v2 is observed in midcentral collisions (30%–50% centrality class), with a mean value of 0.204−0.036+0.099 (tot. unc.) in the interval 2

关键词： MESONS SPECIAL relativity (Physics) NUCLEON-nucleon interactions ANISOTROPY research LARGE Hadron Collider (France & Switzerland) COLLISIONS (Nuclear physics) -- research

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Two- and three-pion quantum statistics correlations in Pb-Pb collisions at sNN=2.76 TeV at the CERN Large Hadron Collider

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Physical Review C 2014年第2期89卷 024911-024911页

作者： B. Abelev J. Adam D. Adamová M. M. Aggarwal G. Aglieri Rinella M. Agnello A. G. Agocs A. Agostinelli N. Agrawal Z. Ahammed N. Ahmad A. Ahmad Masoodi I. Ahmed S. U. Ahn S. A. Ahn I. Aimo S. Aiola M. Ajaz A. Akindinov D. Aleksandrov B. Alessandro D. Alexandre A. Alici A. Alkin J. Alme T. Alt V. Altini S. Altinpinar I. Altsybeev C. Alves Garcia Prado C. Andrei A. Andronic V. Anguelov J. Anielski T. Antičić F. Antinori P. Antonioli L. Aphecetche H. Appelshäuser N. Arbor S. Arcelli N. Armesto R. Arnaldi T. Aronsson I. C. Arsene M. Arslandok A. Augustinus R. Averbeck T. C. Awes M. D. Azmi M. Bach A. Badalà Y. W. Baek S. Bagnasco R. Bailhache V. Bairathi R. Bala A. Baldisseri F. Baltasar Dos Santos Pedrosa J. Bán R. C. Baral R. Barbera F. Barile G. G. Barnaföldi L. S. Barnby V. Barret J. Bartke M. Basile N. Bastid S. Basu B. Bathen G. Batigne B. Batyunya P. C. Batzing C. Baumann I. G. Bearden H. Beck C. Bedda N. K. Behera I. Belikov F. Bellini R. Bellwied E. Belmont-Moreno G. Bencedi S. Beole I. Berceanu A. Bercuci Y. Berdnikov D. Berenyi M. E. Berger A. A. E. Bergognon R. A. Bertens D. Berzano L. Betev A. Bhasin A. K. Bhati B. Bhattacharjee J. Bhom L. Bianchi N. Bianchi C. Bianchin J. Bielčík J. Bielčíková A. Bilandzic S. Bjelogrlic F. Blanco D. Blau C. Blume F. Bock F. V. Boehmer A. Bogdanov H. Bøggild M. Bogolyubsky L. Boldizsár M. Bombara J. Book H. Borel A. Borissov J. Bornschein F. Bossú M. Botje E. Botta S. Böttger P. Braun-Munzinger M. Bregant T. Breitner T. A. Broker T. A. Browning M. Broz E. Bruna G. E. Bruno D. Budnikov H. Buesching S. Bufalino P. Buncic O. Busch Z. Buthelezi D. Caffarri X. Cai H. Caines A. Caliva E. Calvo Villar P. Camerini V. Canoa Roman F. Carena W. Carena F. Carminati A. Casanova Díaz J. Castillo Castellanos E. A. R. Casula V. Catanescu C. Cavicchioli C. Ceballos Sanchez J. Cepila P. Cerello B. Chang S. Chapeland J. L. Charvet S. Chattopadhyay M. Cherney C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato P. Chochula M. Chojnacki S. Choudhury P. Christakoglou C. H. Christensen P. Lawrence Livermore National Laboratory Livermore California 94550 USA Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague Prague Czech Republic Nuclear Physics Institute Academy of Sciences of the Czech Republic Řež u Prahy Czech Republic Physics Department Panjab University Chandigarh India European Organization for Nuclear Research (CERN) Geneva Switzerland Politecnico di Torino Turin Italy Sezione INFN Turin Italy Wigner Research Centre for Physics Hungarian Academy of Sciences Budapest Hungary Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy Indian Institute of Technology Bombay (IIT) Mumbai India Variable Energy Cyclotron Centre Kolkata India Department of Physics Aligarh Muslim University Aligarh India COMSATS Institute of Information Technology (CIIT) Islamabad Pakistan Korea Institute of Science and Technology Information Daejeon South Korea Yale University New Haven Connecticut 06520 USA Institute for Theoretical and Experimental Physics Moscow Russia Russian Research Centre Kurchatov Institute Moscow Russia School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi ” Rome Italy Sezione INFN Bologna Italy Bogolyubov Institute for Theoretical Physics Kiev Ukraine Faculty of Engineering Bergen University College Bergen Norway Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Dipartimento Interateneo di Fisica “M. Merlin” and Sezione INFN Bari Italy Department of Physics and Technology University of Bergen Bergen Norway V. Fock Institute for Physics Saint Petersburg State University St. Petersburg Russia Universidade de São Paulo (USP) São Paulo Brazil National Institute for Physics and Nuclear Engineering Bucharest Romania Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenfors

Correlations induced by quantum statistics are sensitive to the spatiotemporal extent as well as dynamics of particle-emitting sources in heavy-ion collisions. In addition, such correlations can be used to search for the presence of a coherent component of pion production. Two- and three-pion correlations of same and mixed charge are measured at low relative momentum to estimate the coherent fraction of charged pions in Pb-Pb collisions at sNN=2.76 TeV at the CERN Large Hadron Collider with ALICE. The genuine three-pion quantum statistics correlation is found to be suppressed relative to the two-pion correlation based on the assumption of fully chaotic pion emission. The suppression is observed to decrease with triplet momentum. The observed suppression at low triplet momentum may correspond to a coherent fraction in charged-pion emission of 23%±8%.

关键词： PION production QUANTUM statistics CORRELATION (Statistics) COLLISIONS (Nuclear physics) LEAD LARGE Hadron Collider (France & Switzerland) PARTICLE emissions

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Aneurysm Intraluminal Thrombus Compressibility Estimated in vivo Using Electrocardiographically Gated Computed Tomography: A Feasibility Study

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European Journal of Vascular & Endovascular Surgery 2013年第1期46卷 156-156页

作者： Kontopodis, N. Metaxa, E. Pagonidis, K. Georgakarakos, E. Papaharilaou, Y. Ioannou, C.V. Vascular Surgery Department University of Crete Medical School PO Box 1352 711 10 Heraklion Crete Greece Institute of Applied and Computational Mathematics Foundation for Research and Technology – Hellas Heraklion Greece Asklipios Diagnostic Radiology Center Heraklion Greece Vascular Surgery Department “Demokritus” University of Thrace Medical School Alexandroupolis Greece

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Long Term Monitoring of Air Pollution on Monuments and Cultural Heritage Sites in Cyprus Using Satellite Remote Sensing

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International Journal of Heritage in the Digital Era 2012年第1期1卷 145-167页

作者： K. Themistocleous A. Nisantzi A. Agapiou D. D. Alexakis D. G. Hadjimitsis V. Lysandrou S. Perdikou A. Retalis N. Chrysoulakis Department of Civil Engineering & Geomatics Cyprus University of Technology Lemesos Cyprus Restoration of Monuments and Sites Kykkos Museum Department of Civil Engineering Frederick University Nicosia Cyprus Institute of Environmental Research and Sustainable Development National Observatory of Athens Greece Institute of Applied and Computational Mathematics Foundation for Research and Technology - Heraklion Crete Greece

Although cultural heritage sites are documented and preserved, to date there has been limited monitoring and documentation of how cultural heritage sites are affected by air pollution. This paper aims to introduce a new approach for monitoring air pollution for areas near cultural heritage sites by using satellite remotely sensed data. This approach provides a cost-effective tool for local authorities and government agencies to identify the most polluted cultural heritage sites and make decisions regarding the conservation of these sites. Archived data may be used in order to study long term the impact of air pollution to cultural heritage sites. The study area includes significant open air monuments of Cyprus located in the four main cities of the island. In this paper the Limassol Castle is used as a focused case study. Three years of MODIS satellite data was evaluated and analyzed in order to categorize high risk long-term areas. Ground measurements using sun-photometers, spectro-radiometers and particulate matter (PM10) laser photometer were also utilized in the study. The darkest pixel atmospheric correction in conjunction with the use of the radiative transfer equation was applied to retrieve the aerosol optical thickness (AOT) from Landsat TM/ETM+ satellite images in order also to cross-validate the AOT values found from MODIS and sun-photometers. The results of the study indicate that air pollution is high in all the major cities in Cyprus near cultural heritage sites. The results also found that the Limassol castle was most affected by air pollution, while the other cultural heritage sites exhibited similar results.

关键词： monitoring air pollution PM measurements MODIS AOT cultural heritage remote sensing GIS

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FORMATION AND DESTRUCTION OF JETS IN X-RAY BINARIES

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International Journal of Modern Physics: Conference Series 2012年第8期ijmpcs卷 287-292页

作者： IOANNIS CONTOPOULOS NIKOLAOS D. KYLAFIS DEMOSTHENES KAZANAS DIMITRIS M. CHRISTODOULOU Research Center for Astronomy and Applied Mathematics Academy of Athens Athens 11527 Greece University of Crete Physics Department & Institute of Theoretical & Computational Physics Heraklion 71003 Crete Greece Foundation for Research and Technology-Hellas Heraklion 71110 Crete Greece NASA/GSFC Code 663 Greenbelt MD 20771 USA Department of Mathematical Sciences University of Massachusetts Lowell Lowell MA 01854 USA

Neutron-star and black hole X-ray binaries (XRBs) exhibit radio jets, whose properties depend on the X-ray spectral state and history of the source. There is general agreement about the type of the accretion disk around the compact object in the various spectral states. What is missing is a physical explanation for the appearance, disappearance, and re-appearance of jets. We will demonstrate that by invoking a simple physical mechanism proposed more than ten years ago, the so-called Poynting-Robertson Cosmic Battery (PRCB), we can explain in a natural way the disk–jet connection in XRBs.

关键词： accretion disks X-ray binaries black holes magnetic fields

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Some Properties of the Generalized Autoregressive Moving Average (GARMA (1, 1;[delta]1, [delta]2)) Model

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Communications in Statistics: Theory and Methods 2012年第4期41卷 699页

作者： Pillai, Thulasyammal R Shitan, Mahendran Peiris, Shelton [a] Applied & Computational Statistics Laboratory Institute for Mathematical Research Universiti Putra Malaysia Serdang Malaysia [b] Department of Mathematics Faculty of Science Universiti Putra Malaysia Serdang Malaysia [c] Faculty of Engineering and Computer Technology AIMST University Kedah Malaysia [d] School of Mathematics and Statistics The University of Sydney Sydney Australia

A new class of time series models known as Generalized Autoregressive Moving Average (1, 1; δ1, δ2) has been introduced in order to reveal some features of certain time series data. The authors derive the variance and autocovariance of the process in order to study the behavior of the process. It is shown that these new results reduce to the standard ARMA results. Some numerical results are also provided. Due to the generality of this model, it will be useful for modeling purposes.

关键词： Autocorrelation Autocovariance GAR Generalized ARMA model GMA Time Series 62M10

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Results of an implementation of the dual surface method to treat the non-uniqueness in solving acoustic exterior problems using the boundary element method

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Proceedings of Meetings on Acoustics 2013年第1期19卷

作者： Ralf Burgschweiger Ingo Schäfer Adel Mohsen Rafael Piscoya Martin Ochmann Bodo Nolte Department II Project Group Computational Acoustics Beuth Hochschule für Technik Berlin University of Applied Sciences Luxemburger Str. 10 Berlin Berlin 13353 Germany Maritime Technology and Research (WTD71/FWG) Federal Armed Forces Underwater Acoustics and Marine Geophysics Research Institute Klausdorfer Weg 2-24 Kiel 24148 Germany Engineering Mathematics & Physics Department Engineering Faculty Cairo University Giza 12613 Egypt Department II Project Group Computational Acoustics Beuth Hochschule für Technik Berlin University of Applied Sciences Luxemburger Str. 10 Berlin 13353 Germany

The problem of non-uniqueness (NU) of the solution of exterior acoustic problems when using the boundary element method (BEM) is well known. Methods like the Burton-Miller technique or the CHIEF method are used to solve this challenge at the expense of more complex procedures for handling hypersingular integrals and/or higher computing times due to higher complexity of the algorithm or additional equations. The dual surface method, commonly used for electromagnetic problems, was adapted for acoustic radiation and scattering problems. The basic principles of methods to solve the NU problem are outlined and results for different models and solution procedures are presented, taking into account quality, solution time and the numerical advantages when using iterative solvers.

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Observation and Optical Tailoring of Photonic Lattice Filaments

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Physical Review Letters 2012年第11期109卷 113905-113905页

作者： M. Bellec P. Panagiotopoulos D. G. Papazoglou N. K. Efremidis A. Couairon S. Tzortzakis Institute of Electronic Structure and Laser Foundation for Research and Technology Hellas P.O. Box 1527 71110 Heraklion Greece Department of Materials Science and Technology University of Crete P.O. Box 2208 GR-71003 Heraklion Greece Department of Applied Mathematics University of Crete P.O. Box 2208 GR-71003 Heraklion Greece Centre de Physique Théorique Centre National de la Recherche Scientique Ecole Polytechnique F-91128 Palaiseau France

We demonstrate, for the first time, that photonic lattices support a new type of laser filaments, called lattice filaments (LF). The LF attributes (length, width, and intensity) can be tailored by both varying the photonic lattice properties and also dynamically through the interaction between filaments. This opens the way for extensive all-optical control of the nonlinear propagation of intense ultrafast wave packets. Our approach is generic and applicable to all transparent media, with potential strong impact on various photonic applications.

关键词： PHOTONIC crystals CRYSTAL lattices FIBERS LASER beams OPTICAL control NONLINEAR optics WAVE functions

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