Elasticity of mechanical oscillators in nonequilibrium steady states: Experimental, numerical, and theoretical results (Articolo in rivista)

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Label
  • Elasticity of mechanical oscillators in nonequilibrium steady states: Experimental, numerical, and theoretical results (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevE.85.066605 (literal)
Alternative label
  • Conti L.; De Gregorio P.; Bonaldi M.; Borrielli A.; Crivellari M.; Gagik K.; Charles P.; Serra E.; Thakur R.; Rondoni L. (2012)
    Elasticity of mechanical oscillators in nonequilibrium steady states: Experimental, numerical, and theoretical results
    in Physical review. E, Statistical, nonlinear, and soft matter physics (Print); APS, American physical society, College Park, MD (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Conti L.; De Gregorio P.; Bonaldi M.; Borrielli A.; Crivellari M.; Gagik K.; Charles P.; Serra E.; Thakur R.; Rondoni L. (literal)
Pagina inizio
  • 066605-1 (literal)
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  • http://pre.aps.org/abstract/PRE/v85/i6/e066605 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 85 (literal)
Rivista
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  • 9 (literal)
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  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • INFN, Sez Padova, I-35131 Padua, Italy; Politecn Torino, Dip Matemat, I-10129 Turin, Italy; INFN, Sez Torino, I-10125 Turin, Italy; Inst Mat Elect & Magnetism, Nanosci Trento FBK Div, I-38123 Povo, Trento, Italy; INFN, Grp Collegato Trento, Sez Padova, I-38123 Povo, Trento, Italy; Fdn Bruno Kessler, Microtechnol Lab, I-38123 Povo, Trento, Italy; FBK Univ Trento, Interdisciplinary Lab Computat Sci LISC, I-38123 Povo, Trento, Italy (literal)
Titolo
  • Elasticity of mechanical oscillators in nonequilibrium steady states: Experimental, numerical, and theoretical results (literal)
Abstract
  • We study experimentally, numerically, and theoretically the elastic response of mechanical resonators along which the temperature is not uniform, as a consequence of the onset of steady-state thermal gradients. Two experimental setups and designs are employed, both using low-loss materials. In both cases, we monitor the resonance frequencies of specific modes of vibration, as they vary along with variations of temperatures and of temperature differences. In one case, we consider the first longitudinal mode of vibration of an aluminum alloy resonator; in the other case, we consider the antisymmetric torsion modes of a silicon resonator. By defining the average temperature as the volume-weighted mean of the temperatures of the respective elastic sections, we find out that the elastic response of an object depends solely on it, regardless of whether a thermal gradient exists and, up to 10% imbalance, regardless of its magnitude. The numerical model employs a chain of anharmonic oscillators, with first- and second-neighbor interactions and temperature profiles satisfying Fourier's Law to a good degree. Its analysis confirms, for the most part, the experimental findings and it is explained theoretically from a statistical mechanics perspective with a loose notion of local equilibrium. (literal)
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