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International Conference on Mechanic Automation and Control engineering (MACE)

作者： Wensheng Zhang Institute of Computational Mathematics and Scientific/Engineering Computing LSEC Academy of Mathematics and Systems Science Chinese Academy and Sciences Beijing China

The simulation of wave propagation has important applications in many problems such as in computational seismology. Here, we focus on boundary absorbing computations in wave simulation with the finite element method on triangular mesh. The first-order and second-order absorbing boundary conditions based on wave decomposition are presented. Moreover, the absorbing conditions for corners are proposed. The weak formulations combined with absorbing conditions are derived. Numerical computations for a complex model show that boundary reflections are eliminated and the computational efficiency is high by using the mass-lumping technique.

关键词： Boundary conditions Finite element methods computational modeling Propagation Mathematical model Finite difference methods Numerical models

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Waveform inversion of crosshole data based on acoustic wave equation

Waveform inversion of crosshole data based on acoustic wave ...

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International Conference on Mechanic Automation and Control engineering (MACE)

作者： Wensheng Zhang Jia Luo Institute of Computational Mathematics and Scientific/Engineering Computing LSEC Academy of Mathematics and Systems Science Chinese Academy and Sciences Beijing China

Waveform inversion of crosshole data based on acoustic wave equation is investigated in this paper. The inversion is set as an optimization problem with the Lagrange multiplier function. The Tikhonov regularization is adopted in objective function. The gradient of the objective function is generated by solving the adjoint equation of the forward problem with the finite difference method. In order to prevent the quasi-Newton method to trap in local optimal value, a suitable initial model is required. For comparison, the traveltime inversion or tomography is implemented which provide smooth features of the velocity model. Numerical computations are given which show the good ability of the new velocity inversion method.

关键词： Mathematical model Tomography Equations computational modeling Acoustic waves Receivers Geophysics

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hN-adaptive spectral element discretization of optimal control problems for environmental applications

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SeMA Journal 2011年第1期53卷 55-69页

作者： Gaudio, L. Quarteroni, A. MOX- Modellistica e Calcolo Scientifico Dipartimento di Matematica “F. Brioschi” Politecnico di Milano Italy CMCS- Chair of Modeling and Scientific Computing Mathematics Institute of Computational Science and Engineering École Polytechnique Fédérale de Lausanne EPFL Switzerland

In this work, we propose an hN adaptive algorithm for optimal control problems whose space discretization is based on the spectral element method. We focus on a special class of problems described by quadratic cost functional and linear advection-diffusion state equation. This model has been employed to forecast and suitably reduce, by an optimization process, the pollutant concentration in air on a specific area of interest. Moreover, a local adaptive algorithm is employed to achieve a desired accuracy on the cost functional by reducing the computational cost of the problem. © 2011, Sociedad Española de Matemática Aplicada.

关键词： advection-diffusion equation hN-adaptive strategies Optimal control problems spectral element methods

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Flexible Alignment of Images Using B-Spline Reparameterization Based on Multi-resolution Representations— computational Methods

Flexible Alignment of Images Using B-Spline Reparameterizati...

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2011 Fourth International Conference on Intelligent Computation Technology and Automation(2011年第四届智能计算技术与自动化国际会议 ICICTA 2011)

作者： Yanmei Zheng Guoliang Xu State Key Laboratory of Scientific and Engineering Computing Institute of Computational MathematicsAcademy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100190 China

we present a new flexible alignment method to align two or more similar images, especially biological images. By minimizing an energy functional measuring the difference of the initial image and target image, an L2 -gradient flow is derived. The flow is integrated by a finite element method in the spatial direction and an explicit Euler scheme in the temporal direction. Multi-resolution representations are used for achieving efficient multi-scale alignment The experimental results on 2D images show that the proposed method is efficient, effective, robust and capable of capturing the variation of the initial and target images, from large to small scale.

关键词： Flexible alignment Z2 -gradient flow Bi-cubic B-sptine Finite element method Multi-resolution representation

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A Runge‐Kutta Discontinuous Galerkin Method for Detonation Wave Simulation

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AIP Conference Proceedings 2011年第1期1376卷 543-545页

作者： L. Yuan L. Zhang aLSEC Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China bSchool of Science China University of Mining and Technology (Beijing) Beijing 100083 China

We apply a Runge‐Kutta discontinuous Galerkin (RKDG) method to numerical solution of the reactive Euler equations. In order to keep conservation naturally, Taylor basis functions are utilized. We construct a new Taylor basis function which has smaller numerical error than previous Taylor basis function when the TVD limiter is used. The program is written with MPI for parallel computation. Numerical results of two‐dimensional unstable detonation waves demonstrate that the resulting RKDG method performs well in resolving detonation wave structures. Load imbalance due to different stiffness in different subzones is discussed.

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Provenance management in Swift

Provenance management in Swift

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作者： Gadelha Jr., Luiz M.R. Clifford, Ben Mattoso, Marta Wilde, Michael Foster, Ian Computer and Systems Engineering Program Federal University of Rio de Janeiro Brazil National Laboratory for Scientific Computing Brazil Computation Institute University of Chicago United States Mathematics and Computer Science Division Argonne National Laboratory United States

The Swift parallel scripting language allows for the specification, execution and analysis of large-scale computations in parallel and distributed environments. It incorporates a data model for recording and querying provenance information. In this article we describe these capabilities and evaluate the interoperability with other systems through the use of the Open Provenance Model. We describe Swift's provenance data model and compare it to the Open Provenance Model. We also describe and evaluate activities performed within the Third Provenance Challenge, which consisted of implementing a specific scientific workflow, capturing and recording provenance information of its execution, performing provenance queries, and exchanging provenance information with other systems. Finally, we propose improvements to both the Open Provenance Model and Swift's provenance system. © 2011 Elsevier B.V. All rights reserved.

关键词： Interoperability

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Towards distributed multiscale simulation of biological processes

Towards distributed multiscale simulation of biological proc...

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7th IEEE International Conference on e-Science Workshops, eScienceW 201

作者： Bernsdorf, Jörg Berti, Guntram Chopard, Bastien Hegewald, Jan Krafczyk, Manfred Wang, Dinan Lorenz, Eric Hoekstra, Alfons German Research School for Simulation Sciences RWTH Aachen University Aachen Germany Berti CMM Consulting Mathematical Methods Bonn Germany Scientific and Parallel Computing Group University of Geneva Geneva Switzerland Institute for Computational Modeling in Civil Engineering Technische Universität Braunschweig Brunswick Germany Meteorological Institute University of Bonn Bonn Germany Section Computational Science University of Amsterdam Amsterdam Netherlands

ISBN: (纸本)9780769545981

The understanding of biological processes, e.g. related to cardio-vascular disease and treatment, can significantly be improved by numerical simulation. In this paper, we present an approach for a multiscale simulation environment, applied for the prediction of in-stent re-stenos is. Our focus is on the coupling of distributed, heterogeneous hardware to take into account the different requirements of the coupled sub-systems concerning computing power. For such a concept, which is an extension of the standard multiscale computing approach, we want to apply the term Distributed Multiscale computing. © 2011 IEEE.

关键词： Stents

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Half-life of the Iπ=4− intruder state in 34P: M2 transition strengths approaching the island of inversion

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Physical Review C 2012年第6期85卷 064303-064303页

作者： P. J. R. Mason T. Alharbi P. H. Regan N. Mărginean Zs. Podolyàk E. C. Simpson N. Alkhomashi P. C. Bender M. Bowry M. Bostan D. Bucurescu A. M. Bruce G. Căta-Danil I. Căta-Danil R. Chakrabarti D. Deleanu P. Detistov M. N. Erduran D. Filipescu U. Garg T. Glodariu D. Ghiţă S. S. Ghugre A. Kusoglu R. Mărginean C. Mihai M. Nakhostin A. Negret S. Pascu C. Rodríguez Triguero T. Sava A. K. Sinha L. Stroe G. Suliman N. V. Zamfir Department of Physics University of Surrey Guildford Surrey GU2 7XH United Kingdom Department of Physics Almajmaah University P.O. Box 66 11952 Saudi Arabia Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH) RO-077125 Bucharest Romania KACST P.O. Box 6086 Riyadh 11442 Saudi Arabia Department of Physics Florida State University Tallahassee Florida USA Department of Physics Istanbul University 34134 Istanbul Turkey School of Computing Engineering and Mathematics University of Brighton Brighton BN2 4GJ United Kingdom UGC-DAE Consortium for Scientific Research Kolkata Centre Kolkata 700098 India Institute for Nuclear Research and Nuclear Energy (INRNE) Bulgarian Academy of Sciences Sofia Bulgaria Department of Computer Engineering Istanbul Sabahattin Zaim University Istanbul Turkey Department of Physics University of Notre Dame Notre Dame Indiana 46556 USA

The half-life of the 2305-keV, Iπ=4(−) intruder state in 34P has been measured as t1/2=2.0(1) ns using γ-ray coincidence, fast-timing techniques with the Bucharest HPGe and LaBr3:Ce detector array. Excited states in 34P were populated using the 18O(18O,pn)34P fusion-evaporation reaction at a beam energy of 36 MeV. Reduced transition probabilities have been calculated for different values of the M2/E3 mixing ratio, δE3/M2, and compared with shell-model estimates. For small values of the mixing ratio, the B(M2) value was found to be consistent with similar transitions associated with the occupation of neutron f7/2 configurations in this mass region.

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Numerical solution of de St. Venant equations with controlled global boundaries between unsteady subcritical states

Numerical solution of de St. Venant equations with controlle...

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作者： Mendoza, Aldrin P. Valdez, Adrian Roy L. Arceo, Carlene P. Institute of Mathematics University of the Philippines Diliman Quezon City 1101 Philippines Institute of Engineering Tarlac College of Agriculture Camiling Tarlac 2306 Philippines Scientific Computing Laboratory Department of Computer Science University of the Philippines Diliman Quezon City 1101 Philippines

ISBN: (纸本)9789881925121

This paper aims to verify numerical existence of boundary controls that steer the de St. Venant system in finite time, from a given unsteady subcritical state to another. The method of characteristics is used in obtaining the numerical solution. The problem is divided into two parts: first, an unsteady subcritical flow is steered towards a steady one;then such flow is steered towards another unsteady subcritical state.

关键词： Numerical methods

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Numerical investigation of light scattering by coupled plasmonic nanospheres using a high-accuracy multidomain Legendre pseudospectral time-domain method

Numerical investigation of light scattering by coupled plasm...

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2011 30th URSI General Assembly and scientific Symposium, URSIGASS 2011

作者： Chung, Shih-Yung Wang, Chih-Yu Teng, Chun-Hao Chen, Chung-Ping Chang, Hung-Chun Graduate Institute of Electronics Engineering National Taiwan University Taipei 10617 Taiwan Department of Applied Mathematics Center of Mathematical Modeling and Scientific Computing National Chiao Tung University Hsinchu 30010 Taiwan Graduate Institute of Electronics Engineering Department of Electrical Engineering National Taiwan University Taipei 10617 Taiwan Department of Electrical Engineering Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei 10617 Taiwan

ISBN: (纸本)9781424451173

A high-numerical-accuracy multidomain Legendre pseudospectral time-domain (PSTD) method is utilized to study the three-dimensional problem of light scattering by coupled metallic nanospheres and associated plasmonic resonances. With the multidomain technique, the simulation environment is partitioned into curvilinear hexahedral subdomains that well match the geometrical profile and material interfaces, which is an essential treatment to assure numerical accuracy, in particular, in near-field calculations. Cross sections are accurately calculated for studying the effects of different sphere radii and spacings. Interactions between two silver spheres are investigated for different incident wave propagation directions and polarizations. Electric near fields at plasmon resonances are examined. © 2011 IEEE.

关键词： Nanospheres

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