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21.
Andreja Gajovi Jelena Vukajlovi Pletina Kristina
agar Milivoj Plodinec Sao turm Miran eh 《Journal of Raman spectroscopy : JRS》2013,44(3):412-420
In the present work, multiphase polycrystalline BTO nanorods were synthesized using template‐assisted sol–gel deposition and their structural evolution was studied using thermo Raman spectroscopy, X‐ray diffractometry and high‐resolution transmission electron microscopy (HRTEM). In the BTO nanorods, the tetragonal phase was the dominant one, while both Raman and HRTEM indicated a coexistence with the high‐temperature hexagonal polymorph. This phase was stable across the whole of the investigated temperature range (from −95 °C to 200 °C). The investigated nanorods underwent a diffuse phase transition from tetragonal to cubic with respect to the temperature, whereas the final phase‐transition temperature was shifted to higher values compared to that expected for BTO. The low‐temperature orthorhombic‐to‐rhombohedral phase transition was also shifted to higher temperatures. These differences could be explained by the strain induced by the presence of hexagonal nanolamellas intergrown within the tetragonal nanocrystals. This result indicates that the temperature of the ferroelectric phase transition in polycrystalline BTO nanorods can be manipulated by introducing a stable hexagonal phase. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
22.
We construct a class of three-dimensional strongly nonlocal spatiotemporal solitary waves of the nonlocal nonlinear Schrödinger equation, by using superpositions of single accessible solitons as initial conditions. Evolution of such solitary waves, termed the accessible light bullets, is studied numerically by choosing specific values of topological charges and other solitonic parameters. Our numerical results reveal that in strongly nonlocal nonlinear media with a Gaussian response function, different classes of accessible spatiotemporal solitons can be generated and controlled by tailoring different soliton parameters. 相似文献
23.
Yang Chunyu Zhou Qin Triki Houria Mirzazadeh Mohammad Ekici Mehmet Liu Wen-Jun Biswas Anjan Belic Milivoj 《Nonlinear dynamics》2019,95(2):983-994
Nonlinear Dynamics - Interactions of bright solitons in the Heisenberg ferromagnetic spin chain, governed by a $$(2+1)$$ -dimensional nonlinear Schrödinger equation with variable coefficients,... 相似文献
24.
Analytical and numerical investigation of the propagation of optical beams in Kerr-like saturable photorefractive media is carried out, utilizing a novel model for the local isotropic part of the space-charge field generated in the medium. Using a variational technique, optimal propagation parameters for the most stable propagation of otherwise unstable single Gaussian, single vortex, and optical soliton cluster beams are determined. Analogy between a ring of identical weakly overlapping solitons and a vortex of the same topological charge is explored. 相似文献
25.
We report on the experimental observation of a dynamic instability in the interaction of counterpropagating self-trapped beams in a photorefractive strontium barium niobate crystal. While the interaction of copropagating spatial optical solitons exhibits only transient dynamics, resulting in a final steady state, the counterpropagating geometry supports a dynamic instability mediated by intrinsic feedback. Experimental observations are compared with and found to be in qualitative agreement with numerical simulations. 相似文献
26.
Summary A model of the anion-induced adsorptive accumulation combined with a square-wave voltammetric stripping is developed. The dependence of peak currents and peak potentials on the reversibility of redox reactions and on the reaction mechanism is demonstrated. The sensitivity of the method is estimated.
Theorie der Square-Wave Stripping Voltammetrie mit adsorptiver Anreicherung相似文献
27.
ZHONG Wei-Ping YI Lin YANG Zheng-Ping XIE Rui-Hua BELI Milivoj CHEN Goong 《理论物理通讯》2008,50(3):749-752
Collisions of spatial solitons occurring in the nonlinear
Schröinger equation with harmonic potential are studied, using conservation laws and the split-step Fourier method. We find an analytical solution for the separation distance between the spatial solitons in an inhomogeneous nonlinear medium
when the light beam is self-trapped in the transverse dimension. In the self-focusing nonlinear media the spatial solitons can be transmitted stably, and the interaction between spatial solitons is enhanced due to the linear focusing effect (and also diminished for the linear defocusing effect). In the self-defocusing nonlinear media, in the absence of self-trapping or in the presence of linear self-defocusing, no
transmission of stable spatial solitons is possible. However, in such media
the linear focusing effect can be exactly compensated, and the spatial
solitons can propagate through. 相似文献
28.
A model of electrode reaction complicated by slow adsorption of the reactant is developed for square-wave voltammetry with
inverse scan direction. The relationship between the dimensionless net peak current and the logarithm of dimensionless rate
constant of adsorption is a curve with a minimum and a maximum. For this reason the ratio of real net peak current and the
square-root of frequency is a non-linear function of the logarithm of frequency and exhibits either a maximum or a minimum.
The frequency of extreme serves for the estimation of the rate constant: log(k
ads
/D
1/2
) = log(k*
ads
)crit + 0.5 log f
crit
, where (k*
ads
)
crit
is a critical dimensionless rate constant of adsorption. Square-wave voltammetry is sensitive to the kinetics of adsorption
if k
ads
< 102 cm s−1
相似文献
29.
Dragana Jović Milivoj R. Belić Yuri S. Kivshar Cornelia Denz 《Optics Communications》2012,285(3):352-355
We investigated the influence of edges and corners on the Anderson localization of light in disordered two-dimensional photonic lattices that are optically induced in nonlinear saturable photorefractive media. A systematic quantitative study of gradual transition from corner to bulk Anderson localization in truncated two-dimensional photonic lattices was carried out. We analyzed numerically the localization at several corners and edges of the square and triangular photonic lattices and compared them with the localization in bulk medium. We found that, for strong disorder, corners and edges effectively suppress Anderson localization, as compared to the bulk, but to a varying degree. 相似文献
30.
Gulaboski Rubin Mirceski Valentin Lovric Milivoj 《Journal of Solid State Electrochemistry》2019,23(8):2493-2506
Journal of Solid State Electrochemistry - Redox mechanisms in which the redox transformation is coupled to other chemical reactions are of significant interest since they are regarded as relevant... 相似文献