<i>Nonlinear Underwater Acoustics</i> by B. K. Novikov, O. V. Rudenko, and V. I. Timoshenko

Novikov, B. K.; Руденко, О. В.; Timoshenko, V.I.; Breazeale, M. A.

doi:10.1121/1.396924

Cited by 45 publications

(88 citation statements)

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“…One interesting nonlinear probing method uses the self-demodulation effect involved in the parametric antenna operation in underwater acoustics from the 50's [39]. If a modulated sine wave of dynamic strainǫ with amplitude a is generated in a nonlinear medium, with a carrier frequency ω and an amplitude modulation frequency Ω, then this signal is demodulated and a new frequency component Ω is generated in the medium (Fig.…”

Section: Nonlinear Methodsmentioning

confidence: 99%

Precursors and triggering mechanisms of granular avalanches

Delannay

Duranteau

Tournat

2015

Comptes Rendus. Physique

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The dynamics of inclined granular packings driven towards their stability limits are studied experimentally using imaging techniques as well as acoustic methods. The formers allow to study grain rearrangements during the tilting. The implementation of both passive and active acoustic methods for probing the granular packings, with capabilities for time resolved measurements, provides information on various elastic properties of the layers along the destabilization process, including the transient precursors. Systematic experiments of granular layer destabilization for various granular media and external conditions are compared and allow to better understand the mechanisms responsible for the appearance, periodicity and intensity of precursors. La dynamique des empilements granulaires inclinés jusqu'à leur limite de stabilité peut etreétudiéeà l'aide d'expériences utilisant des techniques d'imagerie ou des méthodes acoustiques. Les premières permettent l'étude des réarrangements de grains pendant l'inclinaison. L'implémentation de méthodes acoustiques passives et actives pour le sondage d'empilements granulaires en temps réel, permet d'estimer la variation des propriétéś elastiques au cours du processus de déstabilisation, incluant le régime des précurseurs. Des expériences systématiques de déstabilisation de couches granulaires pour divers milieux granulaires et conditions extérieures sont comparées et permettent d'avoir une meilleure compréhension des mécanismes responsables de l'apparition, de la périodicité et de l'intensité des précurseurs.

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Section: Nonlinear Methodsmentioning

confidence: 99%

Precursors and triggering mechanisms of granular avalanches

Delannay

Duranteau

Tournat

2015

Comptes Rendus. Physique

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“…It is reasonable to call this equation a modified Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation [3] because it differs from original KZK in the replacement of the quadratic nonlinearity p 2 /2 by a modular one | p|.…”

Section: Smoothing Of Singularities By Dissipationmentioning

confidence: 99%

“…[2]. The technique of derivation is based on a combination of the slowly varying profile method and the quasi-optical approximation and is described in detail in books [3,4]. The model (1) is widely used for underwater [3] and medical [4] applications.…”

Section: Introductionmentioning

confidence: 99%

“…1, the interesting waist region has a form which is close to cylindrical. For beams round in cross section, the length of this cylinder is l * , and its base radius is a * [3,4]:…”

Section: Introductionmentioning

confidence: 99%

“…The scheme of derivation of (4) is standard [3,4]. For example, for a fluid the equations of motion (Euler) and continuity for weak disturbances of pressure and density can be reduced to the following differential equation:…”

Section: The Modified Kz-ov Equation For a Bimodular Materialsmentioning

confidence: 99%

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A new equation and exact solutions describing focal fields in media with modular nonlinearity

Руденко

Hedberg

2017

Nonlinear Dyn

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Brand-new equations which can be regarded as modifications of Khokhlov-ZabolotskayaKuznetsov or Ostrovsky-Vakhnenko equations are suggested. These equations are quite general in that they describe the nonlinear wave dynamics in media with modular nonlinearity. Such media exist among composites, meta-materials, inhomogeneous and multiphase systems. These new models are interesting because of two reasons: (1) the equations admit exact analytic solutions and (2)

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Positron Annihilation in Aluminium Films in Electric Contact with Silicon Substrate

Novikov¹,

Rakov²,

Shantarovich

1990

phys. stat. sol. (a)

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The influence of an electric contact between the conducting films Al (10 μm), Al (6 μm) and a 300 μm monosilicon substrate with orientation (100) is studied using positron annihilation technique. It is shown experimentally that an electric contact of aluminium film with silicon substrate manifests itself not only in formation of a contact potential, but also in variation of the positron work function, the Fermimomentum, and momentum density of conductivity electrons, while dimensional electron density remains unchanged.

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Nonlinear Underwater Acoustics by B. K. Novikov, O. V. Rudenko, and V. I. Timoshenko

Cited by 45 publications

References 0 publications

Precursors and triggering mechanisms of granular avalanches

Precursors and triggering mechanisms of granular avalanches

A new equation and exact solutions describing focal fields in media with modular nonlinearity

Positron Annihilation in Aluminium Films in Electric Contact with Silicon Substrate

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