122,528 research outputs found
Tunable wideband bandstop acoustic filter based on two-dimensional multiphysical phenomena periodic systems
No full textCopyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
along with the following message:
The following article appeared in Journal of Applied Physics , Volume 110, Issue 1 and may be found at http://scitation.aip.org/content/aip/journal/jap/110/1/10.1063/1.3599886. Authors own version of final article on e-print serversThe physical properties of a periodic distribution of absorbent resonators is used in this work to design a tunable wideband bandstop acoustic filter. Analytical and numerical simulations as well as experimental validations show that the control of the resonances and the absorption of the scatterers along with their periodic arrangement in air introduce high technological possibilities to control noise. Sound manipulation is perhaps the most obvious application of the structures presented in this work. We apply this methodology to develop a device as an alternative to the conventional acoustic barriers with several properties from the acoustical point of view but also with additional esthetic and constructive characteristics. © 2011 American Institute of Physics.This work was supported by MEC (Spanish Government) and FEDER funds, under Grant No. MAT2009-09438.Romero García, V.; Sánchez Pérez, JV.; García-Raffi, LM. (2011). Tunable wideband bandstop acoustic filter based on two-dimensional multiphysical phenomena periodic systems. Journal of Applied Physics. 110(1):149041-149049. https://doi.org/10.1063/1.3599886S1490411490491101Yablonovitch, E. (1987). Inhibited Spontaneous Emission in Solid-State Physics and Electronics. Physical Review Letters, 58(20), 2059-2062. doi:10.1103/physrevlett.58.2059John, S. (1987). Strong localization of photons in certain disordered dielectric superlattices. Physical Review Letters, 58(23), 2486-2489. doi:10.1103/physrevlett.58.2486Sigalas, M. M., & Economou, E. N. (1992). Elastic and acoustic wave band structure. Journal of Sound and Vibration, 158(2), 377-382. doi:10.1016/0022-460x(92)90059-7Kushwaha, M. S., Halevi, P., Dobrzynski, L., & Djafari-Rouhani, B. (1993). Acoustic band structure of periodic elastic composites. Physical Review Letters, 71(13), 2022-2025. doi:10.1103/physrevlett.71.2022Sigalas, M. M., Economou, E. N., & Kafesaki, M. (1994). Spectral gaps for electromagnetic and scalar waves: Possible explanation for certain differences. Physical Review B, 50(5), 3393-3396. doi:10.1103/physrevb.50.3393Economou, E. N., & Sigalas, M. M. (1993). Classical wave propagation in periodic structures: Cermet versus network topology. Physical Review B, 48(18), 13434-13438. doi:10.1103/physrevb.48.13434Martínez-Sala, R., Sancho, J., Sánchez, J. V., Gómez, V., Llinares, J., & Meseguer, F. (1995). Sound attenuation by sculpture. Nature, 378(6554), 241-241. doi:10.1038/378241a0Sanchez-Perez, J. V., Rubio, C., Martinez-Sala, R., Sanchez-Grandia, R., & Gomez, V. (2002). Acoustic barriers based on periodic arrays of scatterers. Applied Physics Letters, 81(27), 5240-5242. doi:10.1063/1.1533112Lai, Y., Zhang, X., & Zhang, Z.-Q. (2002). Large sonic band gaps in 12-fold quasicrystals. Journal of Applied Physics, 91(9), 6191-6193. doi:10.1063/1.1465114Romero-García, V., Sánchez-Pérez, J. V., García-Raffi, L. M., Herrero, J. M., García-Nieto, S., & Blasco, X. (2009). Hole distribution in phononic crystals: Design and optimization. The Journal of the Acoustical Society of America, 125(6), 3774-3783. doi:10.1121/1.3126948Herrero, J. M., García-Nieto, S., Blasco, X., Romero-García, V., Sánchez-Pérez, J. V., & Garcia-Raffi, L. M. (2008). Optimization of sonic crystal attenuation properties by ev-MOGA multiobjective evolutionary algorithm. Structural and Multidisciplinary Optimization, 39(2), 203-215. doi:10.1007/s00158-008-0323-7Castiñeira-Ibáñez, S., Romero-García, V., Sánchez-Pérez, J. V., & Garcia-Raffi, L. M. (2010). Overlapping of acoustic bandgaps using fractal geometries. EPL (Europhysics Letters), 92(2), 24007. doi:10.1209/0295-5075/92/24007Umnova, O., Attenborough, K., & Linton, C. M. (2006). Effects of porous covering on sound attenuation by periodic arrays of cylinders. The Journal of the Acoustical Society of America, 119(1), 278-284. doi:10.1121/1.2133715Movchan, A. B., & Guenneau, S. (2004). Split-ring resonators and localized modes. Physical Review B, 70(12). doi:10.1103/physrevb.70.125116Hu, X., Chan, C. T., & Zi, J. (2005). Two-dimensional sonic crystals with Helmholtz resonators. Physical Review E, 71(5). doi:10.1103/physreve.71.055601Sánchez-Dehesa, J., Garcia-Chocano, V. M., Torrent, D., Cervera, F., Cabrera, S., & Simon, F. (2011). Noise control by sonic crystal barriers made of recycled materials. The Journal of the Acoustical Society of America, 129(3), 1173-1183. doi:10.1121/1.3531815Krynkin, A., Umnova, O., Yung Boon Chong, A., Taherzadeh, S., & Attenborough, K. (2010). Predictions and measurements of sound transmission through a periodic array of elastic shells in air. The Journal of the Acoustical Society of America, 128(6), 3496-3506. doi:10.1121/1.3506342Pendry, J. B., Holden, A. J., Robbins, D. J., & Stewart, W. J. (1999). Magnetism from conductors and enhanced nonlinear phenomena. IEEE Transactions on Microwave Theory and Techniques, 47(11), 2075-2084. doi:10.1109/22.798002Yablonovitch, E., & Gmitter, T. J. (1989). Photonic band structure: The face-centered-cubic case. Physical Review Letters, 63(18), 1950-1953. doi:10.1103/physrevlett.63.1950Meade, R. D., Brommer, K. D., Rappe, A. M., & Joannopoulos, J. D. (1992). Existence of a photonic band gap in two dimensions. Applied Physics Letters, 61(4), 495-497. doi:10.1063/1.107868Kushwaha, M. S., Halevi, P., Martínez, G., Dobrzynski, L., & Djafari-Rouhani, B. (1994). Theory of acoustic band structure of periodic elastic composites. Physical Review B, 49(4), 2313-2322. doi:10.1103/physrevb.49.2313Laude, V., Achaoui, Y., Benchabane, S., & Khelif, A. (2009). Evanescent Bloch waves and the complex band structure of phononic crystals. Physical Review B, 80(9). doi:10.1103/physrevb.80.092301Romero-García, V., Sánchez-Pérez, J. V., & Garcia-Raffi, L. M. (2010). Evanescent modes in sonic crystals: Complex dispersion relation and supercell approximation. Journal of Applied Physics, 108(4), 044907. doi:10.1063/1.3466988Hussein, M. I. (2009). Theory of damped Bloch waves in elastic media. Physical Review B, 80(21). doi:10.1103/physrevb.80.212301Hussein, M. I., & Frazier, M. J. (2010). Band structure of phononic crystals with general damping. Journal of Applied Physics, 108(9), 093506. doi:10.1063/1.3498806Moiseyenko, R. P., & Laude, V. (2011). Material loss influence on the complex band structure and group velocity in phononic crystals. Physical Review B, 83(6). doi:10.1103/physrevb.83.064301Romero-García, V., Sánchez-Pérez, J. V., & Garcia-Raffi, L. M. (2010). Propagating and evanescent properties of double-point defects in sonic crystals. New Journal of Physics, 12(8), 083024. doi:10.1088/1367-2630/12/8/083024Tournat, V., Pagneux, V., Lafarge, D., & Jaouen, L. (2004). Multiple scattering of acoustic waves and porous absorbing media. Physical Review E, 70(2). doi:10.1103/physreve.70.026609Chen, Y.-Y., & Ye, Z. (2001). Theoretical analysis of acoustic stop bands in two-dimensional periodic scattering arrays. Physical Review E, 64(3). doi:10.1103/physreve.64.036616Ihlenburg, F. (Ed.). (1998). Finite Element Analysis of Acoustic Scattering. Applied Mathematical Sciences. doi:10.1007/b98828Berenger, J.-P. (1994). A perfectly matched layer for the absorption of electromagnetic waves. Journal of Computational Physics, 114(2), 185-200. doi:10.1006/jcph.1994.1159HARARI, I., SLAVUTIN, M., & TURKEL, E. (2000). ANALYTICAL AND NUMERICAL STUDIES OF A FINITE ELEMENT PML FOR THE HELMHOLTZ EQUATION. Journal of Computational Acoustics, 08(01), 121-137. doi:10.1142/s0218396x0000008xQi, Q., & Geers, T. L. (1998). Evaluation of the Perfectly Matched Layer for Computational Acoustics. Journal of Computational Physics, 139(1), 166-183. doi:10.1006/jcph.1997.5868Basu, U., & Chopra, A. K. (2003). Perfectly matched layers for time-harmonic elastodynamics of unbounded domains: theory and finite-element implementation. Computer Methods in Applied Mechanics and Engineering, 192(11-12), 1337-1375. doi:10.1016/s0045-7825(02)00642-4Zeng, Y. Q., He, J. Q., & Liu, Q. H. (2001). The application of the perfectly matched layer in numerical modeling of wave propagation in poroelastic media. GEOPHYSICS, 66(4), 1258-1266. doi:10.1190/1.1487073Lions, J.-L., Métral, J., & Vacus, O. (2002). Well-posed absorbing layer for hyperbolic problems. Numerische Mathematik, 92(3), 535-562. doi:10.1007/s002110100263Liu, Q. H. (1999). Perfectly matched layers for elastic waves in cylindrical and spherical coordinates. The Journal of the Acoustical Society of America, 105(4), 2075-2084. doi:10.1121/1.426812Lassas, M., & Somersalo, E. (1998). On the existence and convergence of the solution of PML equations. Computing, 60(3), 229-241. doi:10.1007/bf02684334Hohage, T., Schmidt, F., & Zschiedrich, L. (2003). Solving Time-Harmonic Scattering Problems Based on the Pole Condition II: Convergence of the PML Method. SIAM Journal on Mathematical Analysis, 35(3), 547-560. doi:10.1137/s0036141002406485Mechel, F. P. (Ed.). (2008). Formulas of Acoustics. doi:10.1007/978-3-540-76833-3Martínez-Sala, R., Rubio, C., García-Raffi, L. M., Sánchez-Pérez, J. V., Sánchez-Pérez, E. A., & Llinares, J. (2006). Control of noise by trees arranged like sonic crystals. Journal of Sound and Vibration, 291(1-2), 100-106. doi:10.1016/j.jsv.2005.05.030Romero-García, V., Sánchez-Pérez, J. V., Castiñeira-Ibáñez, S., & Garcia-Raffi, L. M. (2010). Evidences of evanescent Bloch waves in phononic crystals. Applied Physics Letters, 96(12), 124102. doi:10.1063/1.336773
High optimization process for increasing the attenuation properties of acoustic metamaterials by means of the creation of defects
No full textCopyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics along with the following message:
The following article appeared in “Romero García, V.; Sánchez Pérez, JV.; García-Raffi, LM.; Herrero Durá, JM.; S. Garcia-Nieto; Blasco Ferragud, FX. (2008). High optimization process for increasing the attenuation properties of acoustic metamaterials by means of the creation of defects. Applied Physics Letters. 93:2235021-2235023” and may be found at http://dx.doi.org/10.1063/1.3040317. Authors own version of final article on e-print serversAn improvement in the attenuation capabilities of acoustic metamaterials by means of the creation of defects is considered here as a multiobjective optimization problem. From this point of view, it is possible to define the optimum strategy in the creation of defects to achieve an important increase in acoustic attenuation in a predetermined range of frequencies. A powerful multiobjective optimization algorithm called evMOGA has been used to solve this problem. The study has been restricted to the case of a two-dimensional sonic crystal formed by rigid cylinders in air, the defects being vacancies in the initial structure.This work was partially supported by MEC (Spanish Government) and FEDER funds: Project Nos. 419DPI2005-07835 and MAT2006-03097 and Generalitat Valenciana Project Nos. GV06/026 and GV/2007/191.Romero García, V.; Sánchez Pérez, JV.; García-Raffi, LM.; Herrero Durá, JM.; García Nieto, S.; Blasco Ferragud, FX. (2008). High optimization process for increasing the attenuation properties of acoustic metamaterials by means of the creation of defects. Applied Physics Letters. 93(22):2235021-2235023. https://doi.org/10.1063/1.3040317S223502122350239322Fang, N., Xi, D., Xu, J., Ambati, M., Srituravanich, W., Sun, C., & Zhang, X. (2006). Ultrasonic metamaterials with negative modulus. Nature Materials, 5(6), 452-456. doi:10.1038/nmat1644Torrent, D., & Sánchez-Dehesa, J. (2008). Anisotropic mass density by two-dimensional acoustic metamaterials. New Journal of Physics, 10(2), 023004. doi:10.1088/1367-2630/10/2/023004Sánchez-Pérez, J. V., Caballero, D., Mártinez-Sala, R., Rubio, C., Sánchez-Dehesa, J., Meseguer, F., … Gálvez, F. (1998). Sound Attenuation by a Two-Dimensional Array of Rigid Cylinders. Physical Review Letters, 80(24), 5325-5328. doi:10.1103/physrevlett.80.5325Fokin, V., Ambati, M., Sun, C., & Zhang, X. (2007). Method for retrieving effective properties of locally resonant acoustic metamaterials. Physical Review B, 76(14). doi:10.1103/physrevb.76.144302Sanchez-Perez, J. V., Rubio, C., Martinez-Sala, R., Sanchez-Grandia, R., & Gomez, V. (2002). Acoustic barriers based on periodic arrays of scatterers. Applied Physics Letters, 81(27), 5240-5242. doi:10.1063/1.1533112Torrent, D., & Sánchez-Dehesa, J. (2007). Acoustic metamaterials for new two-dimensional sonic devices. New Journal of Physics, 9(9), 323-323. doi:10.1088/1367-2630/9/9/323Romero-García, V., Fuster, E., García-Raffi, L. M., Sánchez-Pérez, E. A., Sopena, M., Llinares, J., & Sánchez-Pérez, J. V. (2006). Band gap creation using quasiordered structures based on sonic crystals. Applied Physics Letters, 88(17), 174104. doi:10.1063/1.2198012Herrero, J. M., Blasco, X., Martínez, M., Ramos, C., & Sanchis, J. (2007). Non-linear robust identification of a greenhouse model using multi-objective evolutionary algorithms. Biosystems Engineering, 98(3), 335-346. doi:10.1016/j.biosystemseng.2007.06.004Kafesaki, M., & Economou, E. N. (1999). Multiple-scattering theory for three-dimensional periodic acoustic composites. Physical Review B, 60(17), 11993-12001. doi:10.1103/physrevb.60.11993Ehrgott, M., & Tenfelde-Podehl, D. (2003). Computation of ideal and Nadir values and implications for their use in MCDM methods. European Journal of Operational Research, 151(1), 119-139. doi:10.1016/s0377-2217(02)00595-7Coello Coello, C. A., Van Veldhuizen, D. A., & Lamont, G. B. (2002). Evolutionary Algorithms for Solving Multi-Objective Problems. Genetic Algorithms and Evolutionary Computation. doi:10.1007/978-1-4757-5184-
Quodons in Mica 2013
No full textQuodons in Mica 2013
INDEX
1. Introduction.
3. JFR Archilla, SMM Coelho, FD Auret, V Dubinko and V Hizhnyakov.
Experimental observation of moving discrete breathers in germanium.
5. L Brzihik.
Bisolectrons in harmonic and anharmonic lattices.
6. AP Chetverikov.
Solitons and charge transport in triangular and quadratic Morse lattices.
7. LA Cisneros-Ake.
Travelling coherent structures in the electron transport in 2D anharmonic crystal lattices.
8. SMM Coelho, FD Auret, JM Nel and JFR Archilla.
The origin of defects induced in ultra-pure germanium by Electron Beam Deposition.
10. S Comorosan and M Apostol.
Theory vs. Reality - Localized excitations induced by optical manipulation of proteins,
as a different approach to link experiments with theory.
12. L Cruzeiro.
The amide I band of crystalline acetanilide: old data under new light.
13. SV Dmitriev and AA Kistanov.
Moving discrete breathers in crystals with NaCl structure.
15. V Dubinko, JFR Archilla, SMM Coelho and V Hizhnyakov.
Modeling of the annealing of radiation-induced defects in germanium by moving discrete breathers.
16. JC Eilbeck.
Numerical simulations of nonlinear modes in mica: past, present and future.
17. A Ferrando, C Mili\'an, DE Ceballos-Herrera and Dmitry V. Skryabin.
Soliplasmon resonances at metal-dielectric interfaces.
19. YuB Gaididei.
Energy localization in nonlinear systems with flexible geometry.
20. D Hennig.
Existence and non-existence of breather solutions in damped and driven nonlinear lattices.
21. P Jason and M Johansson.
Existence, dynamics and mobility of Quantum Compactons in an extended Bose-Hubbard model.
22. N.
Jiménez, JFR Archilla, Y. Kosevich, V. Sánchez-Morcillo and LM García-Raffi.
A crowdion in mica. Between K40 recoil and transmission sputtering.
24. M Johansson.
Strongly localized moving discrete solitons (breathers): new ways to beat the Peierls-Nabarro barrier.
26. YA Kosevich and AV Savin. Energy transport in molecular chains with combined anharmonic potentials of pair interatomic interaction.
28. B Malomed, C Mejía-Cortés and RA Vicencio.
Mobile discrete solitons in the one-dimensional lattice with the cubic-quintic nonlinearity.
29. FM Russell.
Recording process in iron-rich muscovite crystals.
30. L Salasnich.
Bright solitons of attractive Bose-Einstein condensates confined in quasi-1D optical lattice.
31. V Sánchez-Morcillo, LM, Garcíaa-Raffi, V. Romero-Garcíaa, R. Picó, A. Cebrecos, and Kestutis Staliunas.
Wave localization in chirped sonic crystals.
32. P Selyschev, V Sugakov and T Didenko.
Peculiarities of the change of temperature and heat transfer under irradiation.
33. K Staliunas.
Taming of Modulation Instability: Manipulation, and Complete Suppression of Instability by Spatio-Temporal Periodic Modulation.
34. G Tsironis.
Gain-Driven Breathers in PT-Symmetric Metamaterials.
36. JAD Wattis and IA Butt.
Moving breather modes in two-dimensional lattices.Ministerio de Ciencia e Innovación FIS2008-0484
Targeted band gap creation using mixed sonic crystal arrays including resonators and rigid scatterers
No full textCopyright (2007) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics along with the following message:
The following article appeared in “Fuster García, E.; Romero García, V.; Sánchez Pérez, JV.; García-Raffi, LM. (2007). Targeted band gap creation using mixed sonic crystal arrays including resonators and rigid scatterers. Applied Physics Letters. 90:2441041-2441043” and may be found at http://dx.doi.org/10.1063/1.3040317. Authors own version of final article on e-print servers[EN] Sonic crystals are periodic structures that have acoustic band gaps centred at frequencies depending on the lattice constant of the array and on the direction of the incident acoustic wave. To eliminate this dependence, this work presents designed mixed structures constructed with rigid scatterers and resonators embedded in air. Specifically, balloons filled with a blend of air and helium were used as resonators, showing experimental evidence about the resonant behavior of an array formed with these balloons. As a result, the authors obtain full band gaps in a predetermined range of frequencies desired.This work has been supported by Spain’s Interministerial Science and Technology Commission (Contract No.
200603097 and FEDER and by the Generalitat Valenciana) (Spain) under Grant No. GV/2007/191. The authors would
also like to thank the R+D+i Linguistic Assistance Office at the Universidad Politécnica of Valencia for their help in revising this letter.Fuster García, E.; Romero García, V.; Sánchez Pérez, JV.; García-Raffi, LM. (2007). Targeted band gap creation using mixed sonic crystal arrays including resonators and rigid scatterers. Applied Physics Letters. 90(24):2441041-2441043. https://doi.org/10.1063/1.2748853S24410412441043902
SPECTRAL ANALYSIS OF THE COMPLEX HILL OPERATOR ON THE STAR GRAPH
No full text[EN] The analysis of Hill operator is extended from the real line to a star graph. Generalizing the problem, a detailed analysis of the Hill operator on L2(G) is provided. An explicit description of the resolvent is given and the spectrum is described exactly, solved inverse problem.Research supported by the Erasmus Mundus project ELECTRA, 2014.Rakib F. Efendiev; García-Raffi, LM. (2014). SPECTRAL ANALYSIS OF THE COMPLEX HILL OPERATOR ON THE STAR GRAPH. Proceedings of the Institute of Mathematics and Mechanics. 40(Special Issue 2014):124-132. https://riunet.upv.es/handle/10251/66296S12413240Special Issue 201
Reinforced learning in physics problems: Optimization of a resonator
No full text[ES] La optimización es un contenido que forma parte de prácticamente todos los temarios de cálculo de los primeros cursos de carreras técnicas. Por otro lado, la optmización de sistemas físicos es una pieza clave en la utilización de los mismos en inegniería. En este artículo pretendemos resolver el problema físico de encontrar el resonador de Helmholtz que, con el volumen más pequeño posible, tenga la frecuencia de resonancia lo más pequeña posible. De esta manera tenemos un problema matemático con significado físico y donde además los alumnos conocen los métodos tradicionales basados en el gradiente de la función y el estudio del Hessiano. Aprovecharemos este contexto conocido para abordar el problema utilizando la técnica de Inteligencia Artificial conocida como Aprendizaje por Refuerzo, lo que puede allanar el camino de su comprensión por parte del alumnado. El ejemplo aquí planteado corresponde a un nivel de postgrado.[EN] Optimisation is a subject that appears in practically all the syllabuses of the first coursesin engineering. Moreover, the optimisation of physical systems is a key part of the use ofthe same in engineering. In this article we want to solve the physical problem of finding theHelmholtz resonator with the smallest possible volume and the lowest possible characteristicfrequency fR. In this way, we have a mathematical problem with a physical meaning, forwhich students are also familiar with the traditional methods based on the gradient of thefunction and the study of the Hessian. We will take advantage of this known context toapproach the problem using the Artificial Intelligence technique known as Reinforcement Learning, which may pave the way for its understanding by the students. The examplegiven here would correspond to a postgraduate level.Arnau, Roger;García-Raffi, L. M.;Romero García, V.;Novelli, M. (2025). Aprendizaje reforzado en problemas de física: Optimización de un resonador. Modelling in Science Education and Learning. 18:113-125. https://doi.org/10.4995/msel.2025.23718OJS1131251
A real delivery problem dealt with Monte Carlo techniques
No full text[EN] In this paper we use Monte Carlo Techniques to deal with a real world delivery problem of a food company in Valencia (Spain). The problem is modeled as a set of 11 instances of the well known Vehicle Routing Problem, VRP, with additional time constraints. Given that VRP is a NP-hard problem, a heuristic algorithm, based on Monte Carlo techniques, is implemented. The solution proposed by this heuristic algorithm reaches distance and money savings of about 20% and 5% respectively.This research was partially supported by MICINN, Project MTM2013-43540-P and by UPV, Project Programa de Apoyo a la Investigación y Desarrollo de la UPV PAID-06-12.S577181Fernández de Córdoba, P., L.M. García-Raffi and J.M. Sanchis Llopis (1998), A heuristic algorithm based on Monte Carlo methods for the Rural Postman Problem.Computers and Op. Research,25, No. 12, pp. 1097–1106, 1998.Fernández de Córdoba, P. and L.M. García-Raffi, E. Nieto and J.M. Sanchis Llopis (1999a), Aplicación de técnicas Monte Carlo a un problema real de Rutas de Vehículos.Anales de Ingeniería, Colombia. In press.Fernández de Córdoba, P., L.M. García-Raffi and J.M. Sanchis Llopis (1999b), A Constructive Parallel Algorithm based on Monte Carlo techniques for Routing Problems, Submitted toParallel Computers.Laporte, G. (1992), The Vehicle Routing Problem: an overview of exact and approximate algorithms,European Journal of Operations Research,59, 345.Laporte, G., M. Desrochers and Y. Nobert (1985), “Optimal Routing under Capacity and Distance Restrictions.Operations Research,33, pp. 1050–1073.Laporte G. and Y. Nobert (1987), Exact algorithms for The Vehicle Routing Problem,Surveys in Combinatorial Optimization (S. Martello, G. Laporte, M. Minoux and C. Ribeiro Eds.). North-HollandAmsterdamMayado, A. (1998), Organización de los itinerarios de la flota de camiones de reparto de una sociedad cooperativa. Optimización mediante técnicas de simulación Monte Carlo. Proyecto Fin de Carrera. E.T.S.I.I. Universidad Politécnica de Valencia
Review of launcher lift-off noise prediction and mitigation
No full text[EN] This article provides a comprehensive overview of noise prediction and mitigation methodologies within the context of rocket launch events. The first section presents noise sources generated during the launch and the methods employed for aeroacoustic prediction. In particular, we focus on various prediction approaches, including semi-empirical models, sub-scale experiments, and numerical models. The second section centers on the vibroacoustic study of the payload fairing, introducing the core numerical models used to analyze the fairing's acoustic response. These models consist of the Finite Element Method, the Boundary Element Method, and the Statistical Energy Analysis Method. Finally, we review acoustic mitigation during launch events. This section categorizes mitigation techniques into those acting at the fairing cover, such as sound-absorbing materials, and those acting at the launch platform, such as water injection. Each technology's acoustic performance and its respective advantages and disadvantages are summarized. Furthermore, we introduce acoustic metamaterials based on Helmholtz resonators (HR), which serve as the technological foundation for acoustic metamaterials and hold the potential for application in actual launch vehicles.SH was funded by project PID2021-128676OB-I00 by MCIN/AEI/10.13039/501100011033 and by "ERDF A way of making Europe", by the European Union. LGR acknowledges the funding of project DIN2019-010877. MEG was funded by project PID2019-109175GB-C22.While preparing this work, the author (s) used Grammarly to review the grammar of the article. After using this tool, the author (s) reviewed and edited the content as needed and take (s) full responsibility for the content of the publication.Escartí-Guillem, Mara Salut;García-Raffi, L. M.;Hoyas, S (2024). Review of launcher lift-off noise prediction and mitigation. Results in Engineering. 23. https://doi.org/10.1016/j.rineng.2024.102679S2
Intracranial stenting in the treatment of wide-necked aneurysms.
No full textCoil embolization of brain aneurysms
is a well-established alternative to
surgery and the first choice treatment in
many cases. However, the embolization of
giant aneurysms (maximum diameter >10
mm) and wide-necked lesions (maximum
neck diameter > 4 mm or a dome/neck ratio
< 2) carries a high risk of coil migration.
This complication increases the risk of
thromboembolism. Endovascular techniques
commonly used to treat giant and widenecked
aneurysms include remodelling, embolization
with three-dimensional coils and
the combined use of intracranial stents with
coils or Onyx. We report our experience of
stenting associated with coil embolization to
treat wide-necked aneurysms
Wave focusing using symmetry matching in axisymmetric acoustic gradient index lenses
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The following article appeared in Romero García, V.; Cebrecos Ruiz, A.; Picó Vila, R.; Sánchez Morcillo, VJ.; García-Raffi, LM.; Sánchez Pérez, JV. (2013). Wave focusing using symmetry matching in axisymmetric acoustic gradient index lenses. Applied Physics Letters. 103(26):264106-264106. doi:10.1063/1.4860535 and may be found at http://scitation.aip.org/The symmetry matching between the source and the lens results in fundamental interest for lensing applications. In this work, we have modeled an axisymmetric gradient index (GRIN) lens made of rigid toroidal scatterers embedded in air considering this symmetry matching with radially symmetric sources. The sound amplification obtained in the focal spot of the reported lens (8.24 dB experimentally) shows the efficiency of the axisymmetric lenses with respect to the previous Cartesian acoustic GRIN lenses. The axisymmetric design opens new possibilities in lensing applications in different branches of science and technology.The work was supported by Spanish Ministry of Science and Innovation and European Union FEDER through Project Nos. FIS2011-29734-C02-01 and -02 and PAID 2012/253. V. R. G. is grateful for the support of post-doctoral contracts of the UPV CEI-01-11.Romero García, V.; Cebrecos Ruiz, A.; Picó Vila, R.; Sánchez Morcillo, VJ.; García-Raffi, LM.; Sánchez Pérez, JV. (2013). Wave focusing using symmetry matching in axisymmetric acoustic gradient index lenses. Applied Physics Letters. 103(26):264106-264106. https://doi.org/10.1063/1.4860535S26410626410610326John, S. (1987). Strong localization of photons in certain disordered dielectric superlattices. Physical Review Letters, 58(23), 2486-2489. doi:10.1103/physrevlett.58.2486Yablonovitch, E. (1987). Inhibited Spontaneous Emission in Solid-State Physics and Electronics. 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