Phase transitions for rock-scissors-paper game on different networks

Monte Carlo simulations and dynamical mean-field approximations are performed to study the phase transitions in rock-scissors-paper game on different host networks. These graphs are originated from lattices by introducing quenched and annealed randomness simultaneously. In the resulting phase diagrams three different stationary states are identified for all structures. The comparison of results on different networks suggests that the value of clustering coefficient plays an irrelevant role in the emergence of a global oscillating phase. The critical behavior of phase transitions seems to be universal and can be described by the same exponents.Comment: 4 pages, 4 figures, to be published in PR

Generalized mean-field study of a driven lattice gas

Generalized mean-field analysis has been performed to study the ordering process in a half-filled square lattice-gas model with repulsive nearest neighbor interaction under the influence of a uniform electric field. We have determined the configuration probabilities on 2-, 4-, 5-, and 6-point clusters excluding the possibility of sublattice ordering. The agreement between the results of 6-point approximations and Monte Carlo simulations confirms the absence of phase transition for sufficiently strong fields.Comment: 4 pages (REVTEX) with 4 PS figures (uuencoded

Lattice Covering by Semicrosses of Arm Length 2

Using algebraic and graph theoretical methods we provide an algorithm to determine the integer lattice covering constant of a certain type of n-dimensional cubistic polyhedron. In particular, we verify a special case of a conjecture of S. K. Stein on covering finite abelian groups by cyclic subsets

A REGRESSION MODEL

In the normal linear regression the least square estimation of the coefficients has a series of nice properties. In addition the needed numerical calculations may be done a fairly efficient way. For the case when the application of this widely used least square method is not justified some further methods are suggested. But experience about their statistical and numerical properties can hardly be found. This paper intends to help the practitioner to become familiar with a type of non-least-square regression methods

Chio Chips termékek összehasonlító érzékszervi vizsgálata

A pontozásos érzékszervi vizsgálat eredményei azt mutatták, hogy van összefüggés a 100 és 20 pontos rendszerben történő minősítés adatai között. Bár a Student-féle értékelés szerint a sós és a hagymás-tejfölös chips termékek között nem volt kimutatható szignifikáns különbség, de a Kramer próba szerint mindkét pontozásos rendszer esetében a hagymástejfölös ízesítésű chips termék jobbnak volt minősíthető, mit a sós. Based on the results of sensory evaluation of chips products there is a connection between the results of scoring in the 100 points and 20 points systems. Although there was no significant difference between the salted samples and the samples with flavour of onion and sour cream based on the Student evaluation, but to the Kramer method the chips with onion and sour cream seem to be better than the salted ones

Flow properties of driven-diffusive lattice gases: theory and computer simulation

We develop n-cluster mean-field theories (0 < n < 5) for calculating the flow properties of the non-equilibrium steady-states of the Katz-Lebowitz-Spohn model of the driven diffusive lattice gas, with attractive and repulsive inter-particle interactions, in both one and two dimensions for arbitrary particle densities, temperature as well as the driving field. We compare our theoretical results with the corresponding numerical data we have obtained from the computer simulations to demonstrate the level of accuracy of our theoretical predictions. We also compare our results with those for some other prototype models, notably particle-hopping models of vehicular traffic, to demonstrate the novel qualitative features we have observed in the Katz-Lebowitz-Spohn model, emphasizing, in particular, the consequences of repulsive inter-particle interactions.Comment: 12 RevTex page

Benefits of a marketing cooperative in transition agriculture: Mórakert purchasing and service co-operative

The paper analyses the potential benefits of marketing cooperatives in Hungary, employing a transaction cost economics framework. We found that the purchased quantity, the existence of contracts, flexibility and trust are the most important factors farmers consider when selling their products via a cooperative. The most striking result is that diversification has positive influences on the share of cooperatives in farmers’ sale. Furthermore, farmers with larger bargaining power have less willingness to sell their product to the cooperative. Surprisingly, asset specificity has rather negative effects on the share of cooperatives in members’ sales

Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies

The two-band/two-gap superconductivity in aluminium and carbon doped MgB$_2$ has been addressed by the point-contact spectroscopy. Two gaps are preserved in all samples with $T_c's$ down to 22 K. The evolution of two gaps as a function of the critical temperature in the doped systems suggest the dominance of the band-filling effects but for the increased Al-doping the enhanced interband scattering approaching two gaps must be considered. The magnetic field dependences of the Andreev reflection excess currents as well as zero-energy density of states determined from the experimental data are used to analyze the intraband scattering. It is shown, that while the C-doping increases the intraband scattering in the $\pi$-band more rapidly then in the $\sigma$ band, the Al-doping does not change their relative weight.Comment: 8 pages, incl. 6 figure