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World Financial 2014-2016 Market Bubbles: Oil Negative - US Dollar Positive

100%
Wątorek M., Drożdż S., Oświęcimka P.
Acta Physica Polonica A
|
2016
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vol. 129
|
issue 5
932-936
EN
Based on the log-periodic power law methodology, with the universal preferred scaling factor λ ≈2, the negative bubble on the oil market in 2014-2016 has been detected. Over the same period a positive bubble on the so-called commodity currencies expressed in terms of the US dollar appears to take place with the oscillation pattern which largely is mirror reflected relative to oil price oscillation pattern. It documents recent strong anticorrelation between the dynamics of the oil price and of the USD. A related forecast made at the time of FENS 2015 conference (beginning of November) turned out to be quite satisfactory. These findings provide also further indication that such a log-periodically accelerating down-trend signals termination of the corresponding decreases.
2
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Critical Behaviour of the Mean-Field Ferromagnet Cu_{1.02}[Cr_{1.77}Ti_{0.24}]Se_4

100%
Krok-Kowalski J., Władarz G., Rduch P., Malicka E., Groń T., Guzik A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 6
1102-1104
EN
Magnetization, M, and susceptibility, χ, measurements showed both strong lowering of magnetic moment in comparison with CuCr_2Se_4 matrix and zero-field-cooling-field-cooling susceptibility splitting characteristic for the spin-glass behaviour. Isothermal magnetization curves, M(H), easy saturate and large values both of the Curie T_{C}=253 K and Curie-Weiss θ=283.5 K temperatures indicate the ferromagnetic order which coexists with the spin-glass state. The critical behaviour investigated around the paramagnetic-ferromagnetic phase transition revealed that the values of critical exponents are close to those predicted by the mean field model for long-range magnetic interactions.
3
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Spontaneous Currents in a Bosonic Ring

100%
Makieła D., Maśka M.
Acta Physica Polonica A
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2016
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vol. 130
|
issue 2
569-572
EN
Nonequilibrium dynamics of non-interacting bosons in a one-dimensional ring-shaped lattice is studied by means of the kinetic Monte Carlo method. The system is approximated by the classical XY model (the kinetic term is neglected) and then the simulations are performed for the planar classical spins. We study the dynamics that follows a finite-time quench to zero temperature. If the quench is slow enough the system can equilibrate and finally reaches the ground state with uniform spin alignment. However, we show that if the quench is faster than the relaxation rate, the system can get locked in a current-carrying metastable state characterized by a nonzero winding number. We analyze how the zero-temperature state depends on the quench rate.
4
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Renormalization Group Calculation of Dynamic Exponent in the Models E and F with Hydrodynamic Fluctuations

100%
Dančo M., Hnatič M., Komarova M., Lučivjanský T., Nalimov M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
651-653
EN
The renormalization group method is applied in order to analyze models E and F of critical dynamics in the presence of velocity fluctuations generated by the stochastic Navier-Stokes equation. Results are given to the one-loop approximation for the anomalous dimension γ_{λ} and fixed-points' structure. The dynamic exponent z is calculated in the turbulent regime and stability of the fixed points for the standard model E is discussed.
5
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Complexes of Domain Walls in One-Dimensional Ferromagnets Near and Far from Phase Transition

88%
Janutka A.
Acta Physica Polonica A
|
2013
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vol. 124
|
issue 1
23-28
EN
Interactions of domain walls are analyzed with relevance to formation of stationary bubbles (bound state of two domain walls) and bound states of many domains in one-dimensional systems. We investigate the domain structures in ferromagnets which are described with the Landau-Lifshitz equation as well as the domains in critical systems described with the Ginzburg-Landau equation. Supplementing previous author studies on the creation of hard bubbles [formed by one Bloch domain wall and one Néel (Ising) domain wall] in the presence of an external (magnetic) field, the soft bubbles consisting of two Bloch domain walls or two Néel (Ising) domain walls are studied in detail. The interactions of two domain walls of the same kind are studied in the framework of a perturbation calculus.
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