المؤلفون: Rodriguez-Plata R., Ozcebe A. G., Smerzini C., Lai C. G.

المساهمون: Rodriguez-Plata, R., Ozcebe, A. G., Smerzini, C., Lai, C. G.

مصطلحات موضوعية: Aggravation factor, Basin effect, Earthquake ground motion, Wave propagation

الوصف: In this article the seismic site response of the Norcia basin, Central Italy, has been analyzed using both 1D and 2D ground response numerical models. Period-dependent aggravation factors (PDAFs) quantifying the difference between 2D and 1D site response are provided for two representative cross-sections of the basin. Time-domain linear visco-elastic and non-linear analyses were carried out by the finite difference commercial program FLAC2D. For the former, the PDAFs were computed using a suite of representative ground motion records. Although the basin sediments are constituted by rather stiff soils, the Norcia basin is found to produce a consistent modification and enhancement of ground motion. It is found that the most important source of ground motion aggravation was the generation of Rayleigh waves at the basin edges. The variability of the PDAFs was explored by considering the effects of frequency content of input motion, damping ratio, irregularity of the alluvial-bedrock interface. The effect of the non-linear response of the sediments on the PDAFs was also addressed with reference to the Mw 5 October 30, 2016 event.

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000681295300004; volume:149; firstpage:106854; journal:SOIL DYNAMICS AND EARTHQUAKE ENGINEERING; http://hdl.handle.net/11571/1439007Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85109504664

الإتاحة: https://doi.org/10.1016/j.soildyn.2021.106854Test
http://hdl.handle.net/11571/1439007Test

المؤلفون: Perugia, Ilaria

المساهمون: Perugia, Ilaria

مصطلحات موضوعية: Finite element method, Hyperbolic problem, Maxwell's equation, Wave propagation problem, Modeling and Simulation, Computational Theory and Mathematic, Computational Mathematics

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000418980800003; volume:74; issue:11; firstpage:2645; lastpage:2649; numberofpages:5; journal:COMPUTERS & MATHEMATICS WITH APPLICATIONS; http://hdl.handle.net/11571/1211811Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85017168904

الإتاحة: https://doi.org/10.1016/j.camwa.2017.03.023Test
http://hdl.handle.net/11571/1211811Test

المؤلفون: Kretzschmar, Fritz, MOIOLA, ANDREA, PERUGIA, ILARIA, Schnepp, Sascha M.

المساهمون: Kretzschmar, Fritz, Moiola, Andrea, Perugia, Ilaria, Schnepp, Sascha M.

مصطلحات موضوعية: a priori error analysi, approximation estimate, discontinuous Galerkin method, Maxwell equation, space-time finite element, Trefftz method, wave propagation, Mathematics (all), Computational Mathematic, Applied Mathematics

وصف الملف: STAMPA

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000386133600004; volume:36; issue:4; firstpage:1599; lastpage:1635; numberofpages:37; journal:IMA JOURNAL OF NUMERICAL ANALYSIS; http://hdl.handle.net/11571/1170122Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84990898930; http://imanum.oxfordjournals.orgTest/

الإتاحة: https://doi.org/10.1093/imanum/drv064Test
http://hdl.handle.net/11571/1170122Test
http://imanum.oxfordjournals.orgTest/

المؤلفون: J. A. Cottrell, T. J. R. Hughes, REALI, ALESSANDRO, SANGALLI, GIANCARLO

المساهمون: J. A., Cottrell, T. J. R., Hughe, Reali, Alessandro, Sangalli, Giancarlo

مصطلحات موضوعية: Isogeometric Analysi, NURBS, Structural Vibration, Discrete Spectrum, Wave Propagation, Dispersion Relation

وصف الملف: ELETTRONICO

العلاقة: ispartofbook:Proceedings of COMPDYN 2007 - Computational Methods in Structural Dynamics and Earthquake Engineering; COMPDYN 2007 - Computational Methods in Structural Dynamics and Earthquake Engineering; http://hdl.handle.net/11571/142684Test

الإتاحة: http://hdl.handle.net/11571/142684Test

المؤلفون: SIBILLA, STEFANO, Mossi Michele

المساهمون: Sibilla, Stefano, Mossi, Michele

مصطلحات موضوعية: Swissmetro, pressure wave propagation, railway tunnel

وصف الملف: ELETTRONICO

العلاقة: ispartofbook:Proceedings of MAGLEV 2002 - the 17th International Conference on Magnetically Levitated Systems and Linear Drives; MAGLEV 2002 - 17th International Conference on Magnetically Levitated Systems and Linear Drives; firstpage:53; http://hdl.handle.net/11571/11911Test

الإتاحة: http://hdl.handle.net/11571/11911Test

المؤلفون: DE MATTEIS, GIOVANNI, VIRGA, EPIFANIO GUIDO GIOVANNI

المساهمون: DE MATTEIS, Giovanni, Virga, EPIFANIO GUIDO GIOVANNI

مصطلحات موضوعية: NEMATIC LIQUID CRYSTAL, VISCOSITY COEFFICIENTS, TEMPERATURE-DEPENDENCE, WAVE-PROPAGATION, MAGNETIC FIELD, ATTENUATION, MODULATION, ULTRASOUND, SOUND, LIGHT

الوصف: We extended the analysis of a variational theory for nematoacoustics recently proposed by Virga [Phys. Rev. E 80, 031705 (2009)] by allowing the nematic director to vibrate about an average orientation at the frequency of a propagating wave, a periodic motion that we call the director libration. The acoustic susceptibilities, two phenomenological parameters that, in this theory, express the coupling between director and acoustic fields, are estimated along with an extra viscosity coefficient by using available experimental data.

وصف الملف: STAMPA

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000286757200002; volume:83; issue:1; firstpage:011703; journal:PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS; http://hdl.handle.net/11571/307905Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-78751538882; http://pre.aps.org/abstract/PRE/v83/i1/e011703Test

الإتاحة: https://doi.org/10.1103/PhysRevE.83.011703Test
http://hdl.handle.net/11571/307905Test
http://pre.aps.org/abstract/PRE/v83/i1/e011703Test

المؤلفون: Hiptmair Ralf, MOIOLA, ANDREA, PERUGIA, ILARIA

المساهمون: Hiptmair, Ralf, Moiola, Andrea, Perugia, Ilaria

مصطلحات موضوعية: Time-harmonic wave propagation problem, Trefftz method, Discontinuous Galerkin methods

وصف الملف: STAMPA

العلاقة: info:eu-repo/semantics/altIdentifier/wos/000287696800012; volume:49; issue:1; firstpage:264; lastpage:284; numberofpages:21; journal:SIAM JOURNAL ON NUMERICAL ANALYSIS; http://hdl.handle.net/11571/222566Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79952936678

الإتاحة: https://doi.org/10.1137/090761057Test
http://hdl.handle.net/11571/222566Test

المؤلفون: VIRGA, EPIFANIO GUIDO GIOVANNI

المساهمون: Virga, EPIFANIO GUIDO GIOVANNI

مصطلحات موضوعية: NEMATIC LIQUID CRYSTAL, WAVE PROPAGATION, ULTRASONIC WAVE, HYDRODYNAMICS, FLUCTUATIONS, ATTENUATION, MODULATION

الوصف: The effect of an ultrasonic wave on the nematic texture has long been known, but its interpretation in terms of a coherent dynamical theory has not yet been achieved. A proposal for such a theory is made in this paper. The diverse theoretical approaches attempted in the past to describe the interaction between sound and nematic molecular orientation are briefly summarized. A theory for second-grade fluids, which provides the appropriate theoretical background for nematoacoustics, is also revived. An explicit application of the proposed theory to a simple computable case is given, which yields predictions that are qualitatively confirmed by a number of experimental results.

وصف الملف: STAMPA

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000270383400089; volume:80; issue:3; firstpage:031705; journal:PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS; http://hdl.handle.net/11571/204666Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-70349764566; http://pre.aps.org/abstract/PRE/v80/i3/e031705Test

الإتاحة: https://doi.org/10.1103/PhysRevE.80.031705Test
http://hdl.handle.net/11571/204666Test
http://pre.aps.org/abstract/PRE/v80/i3/e031705Test

المؤلفون: Hughes Thomas J. R., REALI, ALESSANDRO, SANGALLI, GIANCARLO

المساهمون: Hughes Thomas, J. R., Reali, Alessandro, Sangalli, Giancarlo

مصطلحات موضوعية: STRUCTURAL VIBRATIONS, WAVE PROPAGATION, EIGENVALUE PROBLEMS, DISPERSION ANALYSIS, FINITE ELEMENTS, NURBS, B-SPLINES, ACOUSTIC, OPTICAL BRANCHES, FREQUENCY ERRORS, AMPLITUDE SPECTRA, FREQUENCY RESPONSE SPECTRA, EVANESCENT WAVES, STOPPING BANDS

الوصف: We study the discretization behavior of classical finite element and NURBS approximations on problems of structural vibrations and wave propagation. We find that, on the basis of equal numbers of degrees-of- freedom and bandwidth, NURBS have superior approximation properties. In fact, we observe that the high mode behavior of classical finite elements is divergent with the order of approximation, a surprisingly negative result. On the other hand, NURBS offer almost spectral approximation properties, and all modes converge with increasing order of approximation.

وصف الملف: STAMPA

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000260764700003; volume:197; issue:49-50; firstpage:4104; lastpage:4124; journal:COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING; http://hdl.handle.net/11571/137873Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-52749086594; http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V29-4S92THX-4&_user=3719172&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000061210&_version=1&_urlVersion=0&_userid=3719172&md5=fa570c3a391d2fb5db0db8c6370e9dbbTest

الإتاحة: https://doi.org/10.1016/j.cma.2008.04.006Test
http://hdl.handle.net/11571/137873Test
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V29-4S92THX-4&_user=3719172&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000061210&_version=1&_urlVersion=0&_userid=3719172&md5=fa570c3a391d2fb5db0db8c6370e9dbbTest

المؤلفون: LAI, CARLO GIOVANNI, Callerio A., Faccioli E., Morelli V., Romani P.

المساهمون: Lai, CARLO GIOVANNI, Callerio, A., Faccioli, E., Morelli, V., Romani, P.

مصطلحات موضوعية: Underground equipment, Railway, Vibration, Prediction Theory, Building, Wave propagation, Human factors

الوصف: The authors of this paper present the results of a study concerned with the assessment of the vibrational impact induced by the passage of commuter trains running in a tunnel placed underground the city of Rome. Since the railway line is not yet operational, it was not possible to make a direct measurement of the ground vibrations induced by the railway traffic and the only way to make predictions was by means of numerical simulations. The numerical model developed for the analyses was calibrated using the results of a vibration measurement campaign purposely performed at the site using as a vibration source a sinusoidal vibration exciter operating in a frequency-controlled mode. The problem of modeling the vibrational impact induced by the passage of a train moving in a tunnel is rather complex because it requires the solution of a boundary value problem of three-dimensional elastodynamics in a generally heterogeneous, nonsimply connected continuum with a moving source. The subject is further complicated by the difficulties of modeling the source mechanism, which constitutes itself a challenge even in the case of railway lines running at the surface. At last, the assessment of the vibrational impact at a receiver placed inside a building (e.g., a human individual or a sensitive instrument) requires an evaluation of the role played by the structure in modifying the computed free-field ground motion. So far, few attempts have been made to model the whole vibration chain (from the source to the receiver) of railway-induced ground vibrations, with results that have been only moderately successful. The numerical simulations performed in this study were made by using a simplified numerical model aimed to capture the essence of the physical phenomena involved in the above vibration chain including the influence of the structural response as well as the dependence of the predicted vibration spectra on the train speed.

وصف الملف: STAMPA

العلاقة: info:eu-repo/semantics/altIdentifier/wos/WOS:000232435800010; volume:127; issue:5; firstpage:503; lastpage:514; numberofpages:12; journal:JOURNAL OF VIBRATION AND ACOUSTICS; http://hdl.handle.net/11571/152239Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-27644561917

الإتاحة: http://hdl.handle.net/11571/152239Test