Intangible assets reporting: The case of chemical and pharmaceutical industry in the Czech Republic

The cost structure of business entities has been changing in the span of time. Costs associated with intangible assets such as software, patents, licenses, copyrights and goodwill became an important item of costs in the recent days. The paper is focused on the evaluation of the share of intangible assets in total assets and the costs associated with intangible assets in business companies operating in the chemical and pharmaceutical industry in the Czech Republic. The analyzed sample of companies represents two groups of business entities: entities preparing financial statements in accordance with IFRS and the entities preparing financial statement according to the Czech Accounting legislation (CAL). The sample covers period after the mandatory implementation of IFRS for listed companies-starting in 2005 and ending in 2015. The aim of this paper is to evaluate the impact of intangible assets reporting methodology using criteria as the share of this category in assets of companies, its structure and its changes over time and to identify possible reasons for this situation. The analysis revealed that there is an increasing tendency in volume of IAs in companies listed in Prague Stock Exchange.O

Solid state thermochromism in an octahedral Co(ii) complex studied by X-Ray powder diffraction

Resumen del artículo: Pedrero Marín, R.; Barros García, F. J.; Bernalte García, A. y Luna Giles, F. (2018). Solid state thermochromism in an octahedral Co(ii) complex studied by X-Ray powder diffraction. Acta Crystallographica a-foundation and advances, 74, E428. ISSN 2053-2733Abstract of the article: Pedrero Marín, R.; Barros García, F. J.; Bernalte García, A. y Luna Giles, F. (2018). Solid state thermochromism in an octahedral Co(ii) complex studied by X-Ray powder diffraction. Acta Crystallographica a-foundation and advances, 74, E428. ISSN 2053-273

Cyclic Triindoles and Tetraindoles: Substituent and Symmetry Effects on their Structural and Electronic Characteristics

During the last decade heptacyclic 10,15-dihydro-5H-diindolo[3,2-a:3',2'-c]carbazole (triindole) has been extensively studied as a new π-conjugated platform in the construction of self-assembling materials for optoelectronics. Specially remarkably is the record hole mobility values determined on triindole liquid crystals.1 In order to facilitate the design of new materials on a molecular basis and establish clear guidelines to fine tuning electronic parameters, we have recently synthesized new triindole and tetraindole-based systems.2-3 Our joint experimental and theoretical investigation shows that N-substitution, symmetry lowering of the platform, and insertion of π-spacers in extended dimers strongly impact on the fundamental electronic properties of triindoles.2 In addition, saddle-shaped tetraindoles are found to be an interesting 3D rigid scaffold to obtain electroactive molecules with increased dimensionality.3 We hope that this study can not only advance useful structure-property relationships of conjugated indole-based systems but also guide the design of new materials with potential applications in organic electronics.References 1. E.M. García-Frutos, U.K. Pandey, R. Termine, A. Omenat, J. Barberá, J.L. Serrano, A. Golemme, B. Gómez-Lor, Angew. Chem. Int. Ed. 2011, 50, 7399 2. a) C. Ruiz, J.T. López Navarrete, M.C.Ruiz Delgado, B. Gómez-Lor, Org. Lett. 2015, 17, 2258−2261. b) C. Ruiz, E.M. García-Frutos, D.A. da Silva Filho, J.T. López Navarrete, M.C. Ruiz Delgado, and B. Gómez-Lor, J. Phys. Chem. C 2014, 118, 5470−5477 3. C. Ruiz, A. Monge, E. Gutiérrez-Puebla, I. Alkorta, J. Elguero, J. T. López Navarrete, M.C. Ruiz Delgado and B. Gómez-Lor, submittedUniversidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

La experiencia del arte

Fil: García Martínez, J. A.

Entreverse, teoría y metodología práctica de las fuentes orales

Llona, M. (coord./ed.); García-Orellán, R.; Roca i Girona, J. I.; MartínezFlores, L.; Vilanova, M.; Domínguez Prats, P.; Díaz Sánchez,P.; Sandoval García, C. (2012). Entreverse, teoría y metodología práctica delas fuentes orales. Bilbao, Universidad del País Vasco / Euskal Herrico Unibersitatea,Servicio Editoria

Experimental Study of the Influence of Gasoline-Diesel Blends on the Combustion Process and Soot Formation under Diesel Engine-Like Conditions

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Energy & Fuels, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.energyfuels.0c00091.[EN] Recent research has demonstrated that a reduction in pollutant emissions of diesel engines can be achieved by using high octane fuels such as gasoline, methane, or liquefied petroleum gas. Therefore, in this study, the focus was to investigate the influence of blends of diesel and gasoline on combustion characteristics such as ignition delay, rate of heat release, and lift-off length as well as the influence on soot formation. The experiments were carried out in a test rig with optical access which mimics a single-cylinder diesel engine. Four blends were tested: one blend with 100% diesel and then three diesel-gasoline blends with 30%, 50%, and70% gasoline. The blends were made in volumetric proportions and injected using a common rail injection system without any kind of modification. The ignition delay and the apparent heat release were obtained by means of the in-cylinder pressure signal. Furthermore, the combustion development and soot formation were studied using three optical techniques: OH* chemiluminescence, natural luminosity, and diffused back-illumination extinction imaging (DBI). Different engine operating conditions were analyzed. Results showed that ID increases with the gasoline content in the blend. Similarly, as the reacting time increased, the lift-off length was longer. On the other hand, the apparent rate of heat release decreased due to a reduction of the fuel injection rate, which depends on the density of the blend. In addition, differences in the flame radiation were also observed. Gasoline-diesel blends had less luminosity, which is related to less soot formation. To confirm this, the KL factor obtained from the DBI technique was determined, and it was concluded that increasing the gasoline fraction in the blend reduces soot formation.This research work has been partly funded by the Government of Spain and FEDER under TRANCO project (TRA2017-87694-R) and by Universitat Politecnica de Valencia through the Programa de Ayudas de Investigacion y Desarrollo (PAID-01-18 and PAID-06-18) program.Pastor, JV.; García Martínez, A.; Mico Reche, C.; Garcia-Carrero, AA. (2020). Experimental Study of the Influence of Gasoline-Diesel Blends on the Combustion Process and Soot Formation under Diesel Engine-Like Conditions. Energy & Fuels. 34(5):5589-5598. https://doi.org/10.1021/acs.energyfuels.0c00091S55895598345Murugesa Pandian, M., & Anand, K. (2018). Comparison of different low temperature combustion strategies in a light duty air cooled diesel engine. Applied Thermal Engineering, 142, 380-390. doi:10.1016/j.applthermaleng.2018.07.047Kokjohn, S. L., Hanson, R. M., Splitter, D. A., & Reitz, R. D. (2011). Fuel reactivity controlled compression ignition (RCCI): a pathway to controlled high-efficiency clean combustion. International Journal of Engine Research, 12(3), 209-226. doi:10.1177/1468087411401548Kokjohn, S. L., Hanson, R. M., Splitter, D. A., & Reitz, R. D. (2009). Experiments and Modeling of Dual-Fuel HCCI and PCCI Combustion Using In-Cylinder Fuel Blending. SAE International Journal of Engines, 2(2), 24-39. doi:10.4271/2009-01-2647Benajes, J., García, A., Monsalve-Serrano, J., & Boronat, V. (2016). Dual-Fuel Combustion for Future Clean and Efficient Compression Ignition Engines. Applied Sciences, 7(1), 36. doi:10.3390/app7010036Benajes, J., García, A., Monsalve-Serrano, J., & Boronat, V. (2017). Achieving clean and efficient engine operation up to full load by combining optimized RCCI and dual-fuel diesel-gasoline combustion strategies. Energy Conversion and Management, 136, 142-151. doi:10.1016/j.enconman.2017.01.010Benajes, J., García, A., Monsalve-Serrano, J., & Boronat, V. (2017). An investigation on the particulate number and size distributions over the whole engine map from an optimized combustion strategy combining RCCI and dual-fuel diesel-gasoline. Energy Conversion and Management, 140, 98-108. doi:10.1016/j.enconman.2017.02.073Benajes, J., García, A., Monsalve-Serrano, J., & Boronat, V. (2017). Gaseous emissions and particle size distribution of dual-mode dual-fuel diesel-gasoline concept from low to full load. Applied Thermal Engineering, 120, 138-149. doi:10.1016/j.applthermaleng.2017.04.005Dempsey, A. B., Curran, S., & Reitz, R. D. (2015). Characterization of Reactivity Controlled Compression Ignition (RCCI) Using Premixed Gasoline and Direct-Injected Gasoline with a Cetane Improver on a Multi-Cylinder Engine. SAE International Journal of Engines, 8(2), 859-877. doi:10.4271/2015-01-0855Bendu, H., & Murugan, S. (2014). Homogeneous charge compression ignition (HCCI) combustion: Mixture preparation and control strategies in diesel engines. Renewable and Sustainable Energy Reviews, 38, 732-746. doi:10.1016/j.rser.2014.07.019Bermúdez, V., García, J. M., Juliá, E., & Martínez, S. (2003). Engine with Optically Accessible Cylinder Head: A Research Tool for Injection and Combustion Processes. SAE Technical Paper Series. doi:10.4271/2003-01-1110Pastor, J. V., García-Oliver, J. M., García, A., Micó, C., & Möller, S. (2016). Application of optical diagnostics to the quantification of soot in n-alkane flames under diesel conditions. Combustion and Flame, 164, 212-223. doi:10.1016/j.combustflame.2015.11.018Pastor, J., Garcia-Oliver, J. M., Garcia, A., & Nareddy, V. R. (2017). Characterization of Spray Evaporation and Mixing Using Blends of Commercial Gasoline and Diesel Fuels in Engine-Like Conditions. SAE Technical Paper Series. doi:10.4271/2017-01-0843Pastor, J. V., García-Oliver, J. M., García, A., & Pinotti, M. (2017). Effect of laser induced plasma ignition timing and location on Diesel spray combustion. Energy Conversion and Management, 133, 41-55. doi:10.1016/j.enconman.2016.11.054Pastor, J. V., García-Oliver, J. M., García, A., & Pinotti, M. (2016). Laser induced plasma methodology for ignition control in direct injection sprays. Energy Conversion and Management, 120, 144-156. doi:10.1016/j.enconman.2016.04.086Pastor, J. V., Payri, R., Gimeno, J., & Nerva, J. G. (2009). Experimental Study on RME Blends: Liquid-Phase Fuel Penetration, Chemiluminescence, and Soot Luminosity in Diesel-Like Conditions. Energy & Fuels, 23(12), 5899-5915. doi:10.1021/ef9007328Pastor, J. V., García-Oliver, J. M., Nerva, J.-G., & Giménez, B. (2011). Fuel effect on the liquid-phase penetration of an evaporating spray under transient diesel-like conditions. Fuel, 90(11), 3369-3381. doi:10.1016/j.fuel.2011.05.006Reyes, M., Tinaut, F. V., Giménez, B., & Pastor, J. V. (2018). Effect of hydrogen addition on the OH* and CH* chemiluminescence emissions of premixed combustion of methane-air mixtures. International Journal of Hydrogen Energy, 43(42), 19778-19791. doi:10.1016/j.ijhydene.2018.09.005Siebers, D. L., & Higgins, B. (2001). Flame Lift-Off on Direct-Injection Diesel Sprays Under Quiescent Conditions. SAE Technical Paper Series. doi:10.4271/2001-01-0530Pastor, J. V., Garcia-Oliver, J. M., Garcia, A., & Pinotti, M. (2017). Soot Characterization of Diesel/Gasoline Blends Injected through a Single Injection System in CI engines. SAE Technical Paper Series. doi:10.4271/2017-24-0048Pastor, J. V., García, J. M., Pastor, J. M., & Buitrago, J. E. (2005). Analysis Methodology of Diesel Combustion by Using Flame Luminosity, Two-Colour Method and Laser-Induced Incandescence. SAE Technical Paper Series. doi:10.4271/2005-24-012Xuan, T., Pastor, J. V., García-Oliver, J. M., García, A., He, Z., Wang, Q., & Reyes, M. (2019). In-flame soot quantification of diesel sprays under sooting/non-sooting critical conditions in an optical engine. Applied Thermal Engineering, 149, 1-10. doi:10.1016/j.applthermaleng.2018.11.112Xuan, T., Desantes, J. M., Pastor, J. V., & Garcia-Oliver, J. M. (2019). Soot temperature characterization of spray a flames by combined extinction and radiation methodology. Combustion and Flame, 204, 290-303. doi:10.1016/j.combustflame.2019.03.023Wang, J., Yang, F., & Ouyang, M. (2015). Dieseline fueled flexible fuel compression ignition engine control based on in-cylinder pressure sensor. Applied Energy, 159, 87-96. doi:10.1016/j.apenergy.2015.08.101Han, M. (2013). The effects of synthetically designed diesel fuel properties – cetane number, aromatic content, distillation temperature, on low-temperature diesel combustion. Fuel, 109, 512-519. doi:10.1016/j.fuel.2013.03.039Benajes, J., Payri, R., Bardi, M., & Martí-Aldaraví, P. (2013). Experimental characterization of diesel ignition and lift-off length using a single-hole ECN injector. Applied Thermal Engineering, 58(1-2), 554-563. doi:10.1016/j.applthermaleng.2013.04.044Pickett, L. M., Siebers, D. L., & Idicheria, C. A. (2005). Relationship Between Ignition Processes and the Lift-Off Length of Diesel Fuel Jets. SAE Technical Paper Series. doi:10.4271/2005-01-3843Payri, R., Salvador, F. J., Manin, J., & Viera, A. (2016). Diesel ignition delay and lift-off length through different methodologies using a multi-hole injector. Applied Energy, 162, 541-550. doi:10.1016/j.apenergy.2015.10.11

Sound absorption and diffusion by 2D arrays of Helmholtz resonators

[EN] We report a theoretical and experimental study of an array of Helmholtz resonators optimized to achieve both efficient sound absorption and diffusion. The analysis starts with a simplified 1D model where the plane wave approximation is used to design an array of resonators showing perfect absorption for a targeted range of frequencies. The absorption is optimized by tuning the geometry of the resonators, i.e., by tuning the viscothermal losses of each element. Experiments with the 1D array were performed in an impedance tube. The designed system is extended to 2D by periodically replicating the 1D array. The 2D system has been numerically modeled and experimentally tested in an anechoic chamber. It preserves the absorption properties of the 1D system and introduces efficient diffusion at higher frequencies due to the joint effect of resonances and multiple scattering inside the discrete 2D structure. The combined effect of sound absorption at low frequencies and sound diffusion at higher frequencies, may play a relevant role in the design of noise reduction systems for different applications.This research was funded by the European Space Agency under the Networking/Partnering Initiative (NPI) contract number 441-2015. In memoriam to Julián Santiago-Prowald, Senior Advisor for the Structures, Mechanisms and Materials Division of ESA, a great man that always gave us his tireless support. AC acknowledges financial support from Generalitat Valenciana through the grant APOSTD/2018/229. VRG acknowledges the financial support from RFI Le Mans Acoustique (Région Pays de la Loire) in the framework of the project HYPERMETA funded under the program Étoiles Montantes of the Région Pays de la Loire. Authors acknowledge the support of the European Space Agency under contract 441-2015 Co- Sponsored PhD ¿Acoustic Reduction Methods for the Launch Pad¿ and project TRP ESA AO/1-9479/18/NL/LvH ¿Launch Sound Level Reduction¿. This article is based upon work from COST Action DENORMS CA15125, supported by COST (European Cooperation in Science and Technology).Herrero-Durá, I.; Cebrecos, A.; Picó Vila, R.; Romero-García, V.; García-Raffi, LM.; Sánchez Morcillo, VJ. (2020). Sound absorption and diffusion by 2D arrays of Helmholtz resonators. Applied Sciences. 10(5):1-15. https://doi.org/10.3390/app10051690S115105Sigalas, 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)90059-7Matlack, K. H., Bauhofer, A., Krödel, S., Palermo, A., & Daraio, C. (2016). Composite 3D-printed metastructures for low-frequency and broadband vibration absorption. Proceedings of the National Academy of Sciences, 113(30), 8386-8390. doi:10.1073/pnas.1600171113Wormser, M., Wein, F., Stingl, M., & Körner, C. (2017). Design and Additive Manufacturing of 3D Phononic Band Gap Structures Based on Gradient Based Optimization. Materials, 10(10), 1125. doi:10.3390/ma10101125Lucklum, F., & Vellekoop, M. J. (2018). Bandgap engineering of three-dimensional phononic crystals in a simple cubic lattice. Applied Physics Letters, 113(20), 201902. doi:10.1063/1.5049663D’Alessandro, L., Ardito, R., Braghin, F., & Corigliano, A. (2019). Low frequency 3D ultra-wide vibration attenuation via elastic metamaterial. Scientific Reports, 9(1). doi:10.1038/s41598-019-44507-6Martínez-Sala, R., Sancho, J., Sánchez, J. V., Gómez, V., Llinares, J., & Meseguer, F. (1995). Sound attenuation by sculpture. Nature, 378(6554), 241-241. doi:10.1038/378241a0Cebrecos, A., Krattiger, D., Sánchez-Morcillo, V. J., Romero-García, V., & Hussein, M. I. (2019). The finite-element time-domain method for elastic band-structure calculations. Computer Physics Communications, 238, 77-87. doi:10.1016/j.cpc.2018.12.016Cebrecos, A., Romero-García, V., & Groby, J. (2019). Complex Dispersion Relation Recovery from 2D Periodic Resonant Systems of Finite Size. Applied Sciences, 9(3), 478. doi:10.3390/app9030478Hussein, M. I., Leamy, M. J., & Ruzzene, M. (2014). Dynamics of Phononic Materials and Structures: Historical Origins, Recent Progress, and Future Outlook. Applied Mechanics Reviews, 66(4). doi:10.1115/1.4026911Sanchez-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:10.1063/1.1533112Martínez-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.2005.05.030Garcia-Raffi, L. M., Salmerón-Contreras, L. J., Herrero-Durá, I., Picó, R., Redondo, J., Sánchez-Morcillo, V. J., … Romero-García, V. (2018). Broadband reduction of the specular reflections by using sonic crystals: A proof of concept for noise mitigation in aerospace applications. Aerospace Science and Technology, 73, 300-308. doi:10.1016/j.ast.2017.11.048Sanchez-Perez, J. V., Castineira-Ibanez, S., Romero-Garcia, V., & Garcia-Raffi, L. M. (2015). PERIODIC SYSTEMS AS ROAD TRAFFIC NOISE REDUCING DEVICES: PROTOTYPE AND STANDARDIZATION. Environmental Engineering and Management Journal, 14(12), 2759-2769. doi:10.30638/eemj.2015.293Kandula, M. (2009). Broadband shock noise reduction in turbulent jets by water injection. Applied Acoustics, 70(7), 1009-1014. doi:10.1016/j.apacoust.2008.12.001Liu, Z., Zhang, X., Mao, Y., Zhu, Y. Y., Yang, Z., Chan, C. T., & Sheng, P. (2000). Locally Resonant Sonic Materials. Science, 289(5485), 1734-1736. doi:10.1126/science.289.5485.1734Fang, 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/nmat1644Sugimoto, N., & Horioka, T. (1995). Dispersion characteristics of sound waves in a tunnel with an array of Helmholtz resonators. The Journal of the Acoustical Society of America, 97(3), 1446-1459. doi:10.1121/1.412085Theocharis, G., Richoux, O., García, V. R., Merkel, A., & Tournat, V. (2014). Limits of slow sound propagation and transparency in lossy, locally resonant periodic structures. New Journal of Physics, 16(9), 093017. doi:10.1088/1367-2630/16/9/093017Jiménez, N., Cox, T. J., Romero-García, V., & Groby, J.-P. (2017). Metadiffusers: Deep-subwavelength sound diffusers. Scientific Reports, 7(1). doi:10.1038/s41598-017-05710-5Ballestero, E., Jiménez, N., Groby, J.-P., Dance, S., Aygun, H., & Romero-García, V. (2019). Experimental validation of deep-subwavelength diffusion by acoustic metadiffusers. Applied Physics Letters, 115(8), 081901. doi:10.1063/1.5114877Romero-García, V., Sánchez-Pérez, J. V., & Garcia-Raffi, L. M. (2011). Tunable wideband bandstop acoustic filter based on two-dimensional multiphysical phenomena periodic systems. Journal of Applied Physics, 110(1), 014904. doi:10.1063/1.3599886Lagarrigue, C., Groby, J. P., & Tournat, V. (2013). Sustainable sonic crystal made of resonating bamboo rods. The Journal of the Acoustical Society of America, 133(1), 247-254. doi:10.1121/1.4769783Krynkin, 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:10.1121/1.3506342Koussa, F., Defrance, J., Jean, P., & Blanc-Benon, P. (2013). Acoustical Efficiency of a Sonic Crystal Assisted Noise Barrier. Acta Acustica united with Acustica, 99(3), 399-409. doi:10.3813/aaa.918621Castiñeira-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:10.1209/0295-5075/92/24007García-Chocano, V. M., Cabrera, S., & Sánchez-Dehesa, J. (2012). Broadband sound absorption by lattices of microperforated cylindrical shells. Applied Physics Letters, 101(18), 184101. doi:10.1063/1.4764560Lardeau, A., Groby, J.-P., & Romero-García, V. (2016). Broadband Transmission Loss Using the Overlap of Resonances in 3D Sonic Crystals. Crystals, 6(5), 51. doi:10.3390/cryst6050051Cavalieri, T., Cebrecos, A., Groby, J.-P., Chaufour, C., & Romero-García, V. (2019). Three-dimensional multiresonant lossy sonic crystal for broadband acoustic attenuation: Application to train noise reduction. Applied Acoustics, 146, 1-8. doi:10.1016/j.apacoust.2018.10.020Dimitrijević, S. M., García-Chocano, V. M., Cervera, F., Roth, E., & Sánchez-Dehesa, J. (2019). Sound Insulation and Reflection Properties of Sonic Crystal Barrier Based on Micro-Perforated Cylinders. Materials, 12(17), 2806. doi:10.3390/ma12172806Stinson, M. R. (1991). The propagation of plane sound waves in narrow and wide circular tubes, and generalization to uniform tubes of arbitrary cross‐sectional shape. The Journal of the Acoustical Society of America, 89(2), 550-558. doi:10.1121/1.400379Duclos, A., Lafarge, D., & Pagneux, V. (2009). Transmission of acoustic waves through 2D phononic crystal: visco-thermal and multiple scattering effects. The European Physical Journal Applied Physics, 45(1), 11302. doi:10.1051/epjap:2008203Romero-García, V., Theocharis, G., Richoux, O., & Pagneux, V. (2016). Use of complex frequency plane to design broadband and sub-wavelength absorbers. The Journal of the Acoustical Society of America, 139(6), 3395-3403. doi:10.1121/1.4950708Romero-García, V., Theocharis, G., Richoux, O., Merkel, A., Tournat, V., & Pagneux, V. (2016). Perfect and broadband acoustic absorption by critically coupled sub-wavelength resonators. Scientific Reports, 6(1). doi:10.1038/srep19519Jiménez, N., Huang, W., Romero-García, V., Pagneux, V., & Groby, J.-P. (2016). Ultra-thin metamaterial for perfect and quasi-omnidirectional sound absorption. Applied Physics Letters, 109(12), 121902. doi:10.1063/1.4962328Jiménez, N., Romero-García, V., Pagneux, V., & Groby, J.-P. (2017). Quasiperfect absorption by subwavelength acoustic panels in transmission using accumulation of resonances due to slow sound. Physical Review B, 95(1). doi:10.1103/physrevb.95.014205Jiménez, N., Romero-García, V., Pagneux, V., & Groby, J.-P. (2017). Rainbow-trapping absorbers: Broadband, perfect and asymmetric sound absorption by subwavelength panels for transmission problems. Scientific Reports, 7(1). doi:10.1038/s41598-017-13706-4Merkel, A., Theocharis, G., Richoux, O., Romero-García, V., & Pagneux, V. (2015). Control of acoustic absorption in one-dimensional scattering by resonant scatterers. Applied Physics Letters, 107(24), 244102. doi:10.1063/1.4938121Kergomard, J., & Garcia, A. (1987). Simple discontinuities in acoustic waveguides at low frequencies: Critical analysis and formulae. Journal of Sound and Vibration, 114(3), 465-479. doi:10.1016/s0022-460x(87)80017-2Sánchez-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:10.1121/1.3531815Christensen, J., Romero-García, V., Picó, R., Cebrecos, A., de Abajo, F. J. G., Mortensen, N. A., … Sánchez-Morcillo, V. J. (2014). Extraordinary absorption of sound in porous lamella-crystals. Scientific Reports, 4(1). doi:10.1038/srep0467

Equivalence of Faddeev-Jackiw and Dirac approaches for gauge theories

The equivalence between the Dirac method and Faddeev-Jackiw analysis for gauge theories is proved. In particular we trace out, in a stage by stage procedure, the standard classification of first and second class constraints of Dirac's method in the F-J approach. We also find that the Darboux transformation implied in the F-J reduction process can be viewed as a canonical transformation in Dirac approach. Unlike Dirac's method the F-J analysis is a classical reduction procedure, then the quantization can be achieved only in the framework of reduce and then quantize approach with all the know problems that this type of procedures presents. Finally we illustrate the equivalence by means of a particular example.Comment: Latex v2.09, 15 pages, to appear in Int. J. Mod. Phys.

Teraelectronvolt pulsed emission from the Crab Pulsar detected by MAGIC

open145siembargoed_20180405Ansoldi, S.; Antonelli, L. A.; Antoranz, P.; Babic, A.; Bangale, P.; Barres De Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Biasuzzi, B.; Biland, A.; Blanch, O.; Bonnefoy, S.; Bonnoli, G.; Borracci, F.; Bretz, T.; Carmona, E.; Carosi, A.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Caneva, G.; De Lotto, B.; De Oña Wilhelmi, E.; Delgado Mendez, C.; Di Pierro, F.; Dominis Prester, D.; Dorner, D.; Doro, Michele; Einecke, S.; Eisenacher Glawion, D.; Elsaesser, D.; Fernández Barral, A.; Fidalgo, D.; Fonseca, M. V.; Font, L.; Frantzen, K.; Fruck, C.; Galindo, D.; García López, R. J.; Garczarczyk, M.; Garrido Terrats, D.; Gaug, M.; Godinović, N.; González Muñoz, A.; Gozzini, S. R.; Hanabata, Y.; Hayashida, M.; Herrera, J.; Hirotani, K.; Hose, J.; Hrupec, D.; Hughes, G.; Idec, W.; Kellermann, H.; Knoetig, M. L.; Kodani, K.; Konno, Y.; Krause, J.; Kubo, H.; Kushida, J.; La Barbera, A.; Lelas, D.; Lewandowska, N.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; López Coto, R.; López Oramas, A.; Lorenz, E.; Makariev, M.; Mallot, K.; Maneva, G.; Mannheim, K.; Maraschi, L.; Marcote, B.; Mariotti, Mose'; Martínez, M.; Mazin, D.; Menzel, U.; Miranda, J. M.; Mirzoyan, R.; Moralejo, A.; Munar Adrover, P.; Nakajima, D.; Neustroev, V.; Niedzwiecki, A.; Nevas Rosillo, M.; Nilsson, K.; Nishijima, K.; Noda, K.; Orito, R.; Overkemping, A.; Paiano, Simona; Palatiello, M.; Paneque, D.; Paoletti, R.; Paredes, J. M.; Paredes Fortuny, X.; Persic, M.; Poutanen, J.; Prada Moroni, P. G.; Prandini, Elisa; Puljak, I.; Reinthal, R.; Rhode, W.; Ribó, M.; Rico, J.; Rodriguez Garcia, J.; Saito, T.; Saito, K.; Satalecka, K.; Scalzotto, V.; Scapin, V.; Schultz, C.; Schweizer, T.; Shore, S. N.; Sillanpää, A.; Sitarek, J.; Snidaric, I.; Sobczynska, D.; Stamerra, A.; Steinbring, T.; Strzys, M.; Takalo, L.; Takami, H.; Tavecchio, F.; Temnikov, P.; Terzić, T.; Tescaro, D.; Teshima, M.; Thaele, J.; Torres, D. F.; Toyama, T.; Treves, A.; Ward, J.; Will, M.; Zanin, R.Ansoldi, S.; Antonelli, L. A.; Antoranz, P.; Babic, A.; Bangale, P.; Barres De Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Biasuzzi, B.; Biland, A.; Blanch, O.; Bonnefoy, S.; Bonnoli, G.; Borracci, F.; Bretz, T.; Carmona, E.; Carosi, A.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Caneva, G.; De Lotto, B.; De Oña Wilhelmi, E.; Delgado Mendez, C.; Di Pierro, F.; Dominis Prester, D.; Dorner, D.; Doro, Michele; Einecke, S.; Eisenacher Glawion, D.; Elsaesser, D.; Fernández Barral, A.; Fidalgo, D.; Fonseca, M. V.; Font, L.; Frantzen, K.; Fruck, C.; Galindo, D.; García López, R. J.; Garczarczyk, M.; Garrido Terrats, D.; Gaug, M.; Godinović, N.; González Muñoz, A.; Gozzini, S. R.; Hanabata, Y.; Hayashida, M.; Herrera, J.; Hirotani, K.; Hose, J.; Hrupec, D.; Hughes, G.; Idec, W.; Kellermann, H.; Knoetig, M. L.; Kodani, K.; Konno, Y.; Krause, J.; Kubo, H.; Kushida, J.; La Barbera, A.; Lelas, D.; Lewandowska, N.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; López Coto, R.; López Oramas, A.; Lorenz, E.; Makariev, M.; Mallot, K.; Maneva, G.; Mannheim, K.; Maraschi, L.; Marcote, B.; Mariotti, Mose'; Martínez, M.; Mazin, D.; Menzel, U.; Miranda, J. M.; Mirzoyan, R.; Moralejo, A.; Munar Adrover, P.; Nakajima, D.; Neustroev, V.; Niedzwiecki, A.; Nevas Rosillo, M.; Nilsson, K.; Nishijima, K.; Noda, K.; Orito, R.; Overkemping, A.; Paiano, Simona; Palatiello, M.; Paneque, D.; Paoletti, R.; Paredes, J. M.; Paredes Fortuny, X.; Persic, M.; Poutanen, J.; Prada Moroni, P. G.; Prandini, Elisa; Puljak, I.; Reinthal, R.; Rhode, W.; Ribó, M.; Rico, J.; Rodriguez Garcia, J.; Saito, T.; Saito, K.; Satalecka, K.; Scalzotto, V.; Scapin, V.; Schultz, C.; Schweizer, T.; Shore, S. N.; Sillanpää, A.; Sitarek, J.; Snidaric, I.; Sobczynska, D.; Stamerra, A.; Steinbring, T.; Strzys, M.; Takalo, L.; Takami, H.; Tavecchio, F.; Temnikov, P.; Terzić, T.; Tescaro, D.; Teshima, M.; Thaele, J.; Torres, D. F.; Toyama, T.; Treves, A.; Ward, J.; Will, M.; Zanin, R