Nonlinear Highlights
Publications

Michele Griffa
PostDoc, Computational Physics
Contact
Michele recently left LANL for a position EMPA, Zurich.
 EMPA
 Swiss Federal Laboratories for Materials Testing & Research
 Überlandstrasse 129
 8600, Dübendorf, Switzerland
 +41 (0) 44 823 4789  Phone
 +41 (0) 44 823 4009  FAX
 michele.griffa@empa.ch
 Personal Web Site
Research Interests
 Time Reversal Acoustics in Solid Media
 Nonlinear Elasticity
 Ultrasonic and Seismic Imaging
 High Performance Parallel Computing/Cluster Computing
 Monte Carlo Methods for Inverse Problems
 Soft Computing
 Computational Systems Biology
Education
 Ph.D., Physics, Polytechnic of Torino, Dept. of Physics, January, 2007
 M.S., Physics, University of Torino, Cum Laude, Thesis  'The role of mechanical pressure, cellular adhesion and apoptosis in the growth of multicellular tumor spheroids: physicalmathematical modeling', 2003
Affiliations
Experience
 Present  Los Alamos National Lab, EES11
 2004  2006: Ph.D. student in Physics, XIX Cicle, Polytechnic of Torino, Dept. of Physics
 2003  2004: Research Fellow at the Department of Physics Polytechnic of Torino, TorinoPolytechnic Research Unit of the INFMCNISM
 Curriculum Vitae
Scientific & Technical Skills
 Theoretical and Computational Physics: Continuum Mechanics, specifically Elasticity Theory and numerical simulation of elastic (acoustic and ultrasonic) wave propagation through heterogeneous materials; quantum theory of condensed matter; Monte Carlo methods in Materials Sciences
 Scientific Computing: finite differences methods; finite elements methods; parallel computing with PC cluster (Beowulf clusters); scalar and parallel codes optimization for scientific computing; Soft Computing methods (Artificial Neural Networks, Genetic Algorithms, Bayesian methods); signal numerical processing for imaging purposes
 Biomathematics: mathematical models of spatialtemporal tumor growth; biomechanical models of biological growth; Population Dynamics; reactiondiffusion equations and pattern formation in Developmental Biology; Dynamical Systems Theory for biological systems
 Imaging and Inverse Problems Theory: imaging with ultrasounds for nondestructive evaluation of materials, probabilistic methods for the resolution of Inverse Problems, Genetic Algorithms for the solution of global optimization problems involved in Inversion
 Cybernetics and Mathematical Systems Theory: characterization and analysis of dynamic systems; Stochastic Processes Theory for signal processing
 Basic knowledge of Microelectronics and Physics of electronic devices (6 months of experience in a Microelectronics Lab)
 Web technologies and Networking: basic knowledge of TCP/IP protocols and clientserver architectures, development of static e dynamic HTML web pages, XMLbased markup languages (DHTML, XHTML) for the Semantic Web, database technologies (server MySQL, SQL language, development of graphical user interfaces to SQL databases)
 eScience  Large scale scientific databases, web platforms for social networking in Science and Engineering; bibliographic databases; data and images postprocessing through Grid Computing; since 2002, experience as a systems administrator: GNU/Linux PCs, Beowulflike clusters of PCs for parallel computing; experience in scientific projects administrativefinancialbureaucratic management
Voluntary Services
 Italian Red Cross, Aide and Tech, February 2003 to October 2006
Computer/Computing Skills
 Highlevel programming Languages  C, C++, Pascal
 MachineLevel Languages  Motorola 6800 Assembly language
 Markup Languages  TeX/LaTeX, HTML, XML
 Relational Databases  SQL, MySQL, RDBMS
 OS Expertise  GNU/Linux O.S.s, Fedora, SuSE, Mandrake (dal 2005, Mandriva) distros, MS Windows (NT, 2K, XP)
 High Performance Computing/Parallel Computing
 Parallel programming for GNU/Linuxbased clusters with MPI (MPICH) (distributedmemory systems) (distributedmemory parallel systems)
 Multithreading programming for multicore architecture and shared memory parallel computers (OpenMP)
 Optimization of scalar code on GNU/Linux systems with an Intel Pentium architecture (i486, i586), Intel optimized compiler
 Systemadministration of GNU/Linuxbased clusters (Beowulf clusters) (OpenPBS)
 IDE (Integrated Development Environments)
 Develop, Eclipse, MS Visual Studio
 Scientific Computing Environments  Matlab, Scilab
Publications
Published Papers in International PeerReviewed Journals
 Anderson, B. E., Griffa, M., Larmat, L., Ulrich, TJ, and Johnson, P. A., "Time Reversal," Acoust. Today, 4 (1), p. 516 (2008). (PDF File  1.2 MB)
 M. Griffa, B. E. Anderson, R. A. Guyer, T. J. Ulrich, P. A. Johnson, Investigation of the robustness of time reversal acoustics in solid media through the reconstruction of temporally symmetric sources, J. Phys. D: Appl. Phys. 41, 085415 (2008). (Abstract)
 P.P. delsanto, C.A. Condat, N. Pugno, A.S. Gliozzi, M. Griffa, A Multilevel Approach to Cancer Growth Modeling, J. Theor. Biol. 250 (1), 1624 (2007).
 A.S. Gliozzi, M. Griffa, M. Scalerandi, Efficiency of Time Reversed Acoustics in Nonlinear Defect Imaging in Solids, J. Acous. Soc. America 120 (5), 25062517 (2006).
 M. Scalerandi, M. Nobili, M. Griffa, A. Gliozzi, F. Bosia, A PreisachMayergoyz approach to fatigue induced irreversibility, Phys. Rev. B 73, 092103 (2006).
 M. Bentahar, H. El. Aqra, R. El Guerjouma, M. Griffa, M. Scalerandi, Hysteretic elasticity in damaged concrete: quantitative analysis of slow and fast dynamics, Phys. Rev. B 73, 014116 (2006).
 P.P. Delsanto, M. Griffa, C.A. Condat, S. Delsanto, L. Morra, Bridging the gap between mesoscopic and macroscopic models: the case of multicellular tumor spheroids, Phys. Rev. Lett. 94, 148105 (2005).
 M. Griffa, M. Scalerandi, C. Camagna, Influence of the Medium Rigidity on the Growth of Multicellular Tumor Spheroids, European Physical Journal: Applied Physics 30, 6571, 2005.
 M. Griffa, M. Scalerandi, Environmental physical modulation of intrinsic tendency to growth of Multicellular Tumor Spheroids: in silico experiments, Phys. Scripta T118, 183  186 (2005).
 M. Griffa, M. Scalerandi, Physical modeling and simulations of tumor growth and angiogenesis: predictions and new hypotheses, Physica Scripta, T118, 179 182 (2005).
 P.P. Delsanto, L. Morra, S. Delsanto, M. Griffa, C. Guiot, Towards a Model of Local and Collective Mechanisms in Multicellular Tumor Spheroids Growth, Phys. Scripta T118, 157, 160 (2005).
 M. Scalerandi, M. Griffa, Modelling the coupling between apoptosis and host rigidity in the growth of Multicellular Tumour Spheroids, WSEAS Transactions on Biology and Biomedicines 1, 237 (2004).
 M. Griffa, S. Delsanto, L. Morra, P.P. Delsanto, Mesoscopic Modeling of Multicellular Tumor Spheroids: Validation through a Quantitative Comparison with Experimental Data, WSEAS Transactions on Biology and Biomedicines 1, 249 (2004).
Papers in Proceedings of International Conferences
 B.E. Anderson, TJ Ulrich, M. Griffa, P.A. Johnson, M. Scalerandi, A. Gliozzi, Selective Source Reduction to Identify Masked Smaller Sources Using Time Reversal Acoustics, Proceedings of QNDE (Quantitative NonDestructive Evaluation) 2007 Conference, July 22nd  27th 2007, Golden, Colorado, USA.
 TJ Ulrich, B.E. Anderson, M. Griffa, Improving Focal Determination of Time Reversed Acoustic Signals, Proceedings of QNDE (Quantitative NonDestructive Evaluation) 2007 Conference, July 22nd  27th 2007, Golden, Colorado, USA.
 B.E. Anderson, P.A. Johnson, TJ Ulrich, M. Griffa, Complex source imaging using timereversal (TR): experimental studies of spatial and temporal resolution limits, Proceedings of the 153rd Meeting of the Acoustical Society of America, June 4th  8th 2007, Salt Lake City, Utah, USA.
 M. Griffa, P.A. Johnson, R.A. Guyer, T.J. Ulrich, B.E. Anderson, Time Reversal Acoustics (TRA) reconstruction of symmetricintime sources in solid elastic specimens: investigation of the effects of finitesize transducers on TRA in solids, Proc. XII International Workshop on Nonlinear Elasticity in Materials (IWNEM), Ajaccio (Corsica), June 3rd  9th 2007.
 M. Nobili, F. Bosia, A. Gliozzi, M. Griffa, M. Scalerandi, Acoustic Emission and Nonlinear Elasticity in Fatigue Induced Damage, Proceedings of the 12th International Congress on Sound and Vibration, ICSV12, Lisbon, July 11th  14th 2005.
 F. Bosia, P.P. Delsanto, A. Gliozzi, M. Griffa, M. Nobili, M. Scalerandi, Acoustic Emission and Nonlinear Hysteretic Elasticity: a combined model, Proceedings of the 12th International Congress on Sound and Vibration  ICSV12  Lisbon, July 11th  14th 2005.
 M. Bentahar, R. El Guerjouma, M. Griffa, M. Scalerandi, Mèthodes émergents en acoustique nonlinéaire pour le controle non destructif et le controle de santé des matériaux, Proceedings of the 17th French Congress of Mechanics, August 29th  September 2nd, Troyes (France).
 S. Delsanto, L. Morra, M. Griffa, C. Demartini, A Genetic Algorithms' Approach to the Exploration of Paramter Space in Mesoscopic Multicellular Tumor Spheroids Models, Conference Proceedings, IEEE EMBC 2004 (26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society), 15 Sept. 2004, Vol. 1, 675678.
Inclusions in Books
 M. Scalerandi, M. Nobili, M. Griffa, A.S. Gliozzi and F. Bosia, Numerical Analysis of the Anomalous Elastic Behavior of Hysteretic Media: QuasiStatic, Dynamic and Relaxation Experiments, Chapter 17, pag. 267284, in The universality of nonclassical nonlinearity/ with applications to NDE and Ultrasonics, edited by P.P. Delsanto, Springer (New York), 2006.
 S. Delsanto, M. Griffa, L. Morra, Inverse Problems and Genetic Algorithms. Applications in NDE/NDT & Ultrasonics, Chapter 22, 369386, in The universality of nonclassical nonlinearity/ with applications to NDE and Ultrasonics, edited by P.P. Delsanto, Springer (New York), 2006.
