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The effect of a surface on the dynamic and thermodynamic properties of S=1 Heisenberg ferromagnet with biquadratic exchange

Pavkov, M; Škrinjar, M; Kapor, D; Stojanović, S - In: Physica A: Statistical Mechanics and its Applications 280 (2000) 3, pp. 465-483

Properties of semi-infinite (S=1) Heisenberg ferromagnet with biquadratic exchange were studied in terms of surface exchange (ε=IS/I) and biquadratic coupling (a). It was shown that a strict correlation exists, depending on ε, between the type of surface spin waves (acoustic or optical) and...

Persistent link: https://www.econbiz.de/10011057055

Quantum Monte-Carlo study of the Heisenberg chain with long-range ferromagnetic interactions

Vassiliev, O.N; Rojdestvenski, I.V; Cottam, M.G - In: Physica A: Statistical Mechanics and its Applications 294 (2001) 1, pp. 139-154

Thermodynamic properties of the Heisenberg ferromagnetic chain are investigated using the Handscomb quantum Monte-Carlo method. The spin–spin interaction is long-range with the spin coupling parameter depending as r−p on the distance r between spins. Parameter p is in the range 1p⩽4. The...

Persistent link: https://www.econbiz.de/10011062847

A study on the intercepted insolation as a function of slope and azimuth of the surface

Gopinathan, K.K.; Maliehe, N.B.; Mpholo, M.I. - In: Energy 32 (2007) 3, pp. 213-220

horizontal surface. The anisotropic model suggested by Hay is used in obtaining daily radiation at various slopes and …

Persistent link: https://www.econbiz.de/10010811141

Mean-field renormalization group for the q-state clock spin-glass model

Chen, Shyh-Tzer - In: Physica A: Statistical Mechanics and its Applications 229 (1996) 2, pp. 181-187

= 4 clock, the transition from paramagnet to spin glass is an anisotropic spin-glass phase. However, for q ⩾ 5 clock, the … result of anisotropic spin-glass phase depends on the temperature and the distribution of random coupling. While the …

Persistent link: https://www.econbiz.de/10011059561

A new anisotropic continuum model for traffic flow

Gupta, A.K.; Katiyar, V.K. - In: Physica A: Statistical Mechanics and its Applications 368 (2006) 2, pp. 551-559

headway in terms of the density. The new model contains an additional speed gradient term (Anisotropic term) in comparison to … the Berg's model [Berg et al., Phys. Rev. E 61(2) (2000) 1056]. This anisotropic term guarantees the property that the … (1995) 277]. In our general model, a traffic dependent anisotropic factor controls the non-isotropic character and diffusive …

Persistent link: https://www.econbiz.de/10011061570

Percolation exponents and threshold in two nearly ideal anisotropic continuum systems

Wu, Junjie; McLachlan, D.S. - In: Physica A: Statistical Mechanics and its Applications 241 (1997) 1, pp. 360-366

Compressed discs made from graphite and, its mechanical but not electrical isomorph, boron nitride, as well as graphite-boron nitride powders, undergoing compression, are nearly ideal continuum percolation systems; as the ratio of their conductivities is 10−18 and the scatter of the...

Persistent link: https://www.econbiz.de/10011062748

The ferromagnet spin-1/2 Ising superlattice in a transverse field

Dujardin, F.; Stébé, B.; Ainane, A.; Saber, M. - In: Physica A: Statistical Mechanics and its Applications 269 (1999) 2, pp. 322-328

The phase transitions of a ferromagnet spin-1/2 Ising superlattice consisting of two different materials are examined using the effective field theory. The critical temperature of the system is studied as a function of the thickness of the constituents in a unit cell, exchange interactions in...

Persistent link: https://www.econbiz.de/10010873441

Magnetic properties of a mixed spin- 1/2 and spin- 3/2 transverse Ising model in a longitudinal magnetic field

Liang, Ya-Qiu; Wei, Guo-Zhu; Ma, Feng-Cai; Song, Guo-Li - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 18, pp. 4513-4518

The mixed spin- 1/2 and spin- 3/2 transverse Ising model in a longitudinal magnetic field is studied within the framework of the effective-field theory with correlations. In this approach the effective-field equations are derived by using a probability distribution method based on the...

Persistent link: https://www.econbiz.de/10010873853

Time-convolutionless mode-coupling theory near the glass transition—A recursion formula and its asymptotic solutions

Tokuyama, Michio - In: Physica A: Statistical Mechanics and its Applications 430 (2015) C, pp. 156-170

The time-convolutionless mode-coupling theory (TMCT) equation for the intermediate scattering function fα(q,t) derived recently by the present author is analyzed mathematically and numerically, where α=c stands for a collective case and α=s for a self case. All the mathematical formulations...

Persistent link: https://www.econbiz.de/10011264568

Numerical experiments of phase separation in ternary mixtures

Copetti, M.I.M. - In: Mathematics and Computers in Simulation (MATCOM) 52 (2000) 1, pp. 41-51

We consider an explicit finite element approximation of a model for phase separation in a ternary mixture and describe some numerical experiments in two space dimensions.

Persistent link: https://www.econbiz.de/10010750058