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Modelling and sensitivity analysis for design of phononic crystals
The two-scale homogenization is employed to study the band gaps in strongly heterogeneous periodic elastic media - the phononic crystals. It was observed that wave propagation can be suppressed for certain frequency interva...
JI - Kompositní materiály
- 2006 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Phononic 0.1 - Software for prediction of band gaps in phononic materials
structures can suppress the elastic wave propagation, i.e. they exhibit the band gaps. We distribution of the band gaps in such media for stationary or long guided waves veryThe phononic materials are bi-...
JJ - Ostatní materiály
- 2009 •
- R
Rok uplatnění
R - Software
Shape optimization for homogenized phononic materials and band gap structures
be negative for whole frequency intervals called band gaps, thereby the wave propagation of the "soft" inclusions in the microstructure the band gaps can be extended. In the paperThe paper deals with optimal desig...
JI - Kompositní materiály
- 2015 •
- D
Rok uplatnění
D - Stať ve sborníku
Wave propagation in phononic plates -- spectral decomposition, polarization and band gaps
can be negative, giving rise to the so-called band gaps to an external periodic loading by forces with frequencies in range of the band gapsThis paper reviews our very recent research focused on modelling of the <...
JI - Kompositní materiály
- 2014 •
- D
Rok uplatnění
D - Stať ve sborníku
Optical response of DyN
Optical response of polycrystalline DyN thin film is reported from far-infrared up to near-UV region. Optical band gap of 1.2 eV was observed. When dopoed with nitrogen vacancies it shows free carrier absorption and a blue-shifted <...
BM - Fyzika pevných látek a magnetismus
- 2013 •
- Jx •
- Link
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Výsledek na webu
The temperature dependence of the phononic band gap of NaI
The position and size of the energy gap in the phonon density of states of NaI single crystal have been investigated by inelastic neutron scattering in a wide range effectively leads to closure of the phonon gap at...
BM - Fyzika pevných látek a magnetismus
- 2013 •
- Jx •
- Link
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Výsledek na webu
Microstructural sensitivity of acoustic band gaps
Acoustic wave propagation in strongly heterogeneous elastic media is studied in terms of the homogenized model. The effective mass density is represen ted by a second-order tensor which depends on the frequency of harmonic waves. Existence of ban...
JI - Kompositní materiály
- 2005 •
- D
Rok uplatnění
D - Stať ve sborníku
Modelling of evanescent and propagating modes in homogenized phononic structures in frequency and time domains
phononic elastic structures subject to harmonic loading. The band gap prediction modelling is to understand behaviour of the phononic structures subject to incident waves of frequencies falling in the partial (so-...
Acoustics
- 2017 •
- D •
- Link
Rok uplatnění
D - Stať ve sborníku
Výsledek na webu
Modelling response of phononic Reissner-Mindlin plates using a spectral decomposition
. Frequency intervals called band gaps exist for which these coefficients constituting with frequencies in range of the band gaps. Numerical illustrations are given.This paper reviews our very recent research focus...
JI - Kompositní materiály
- 2015 •
- Jx •
- Link
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
Výsledek na webu
On acoustic band gaps in homogenized piezoelectric phononic materials
with the purely elastic composite, the resulting model allows existence of the acoustic band gaps. These are identified for certain frequency ranges whenever the so-called homogenized mass becomes negative. The homogenized model ca...
BI - Akustika a kmity
- 2010 •
- Jx
Rok uplatnění
Jx - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
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