4,752 research outputs found
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
The Blazhko effect and additional excited modes in RR Lyrae stars
Recent photometric space missions, such as CoRoT and Kepler revealed that
many RR Lyrae stars pulsate -- beyond their main radial pulsation mode -- in
low amplitude modes. Space data seem to indicate a clear trend, namely overtone
(RRc) stars and modulated fundamental (RRab) RR Lyrae stars ubiquitously show
additional modes, while non-Blazhko RRab stars never do. Two Kepler stars (V350
Lyr and KIC 7021124), however, apparently seemed to break this rule: they were
classified as non-Blazhko RRab stars showing additional modes. We processed
Kepler pixel photometric data of these stars. We detected small amplitude, but
significant Blazhko effect for both stars by using the resulted light curves
and OC diagrams. This finding strengthens the apparent connection between
the Blazhko effect and the excitation of additional modes. In addition, it
yields a potential tool for detecting Blazhko stars through the additional
frequency patterns even if we have only short but accurate time series
observations. V350 Lyr shows the smallest amplitude multiperiodic Blazhko
effect ever detected.Comment: 6 pages, 4 figures and 2 tables. Accepted for publication in ApJ
Letter
Causation, Measurement Relevance and No-conspiracy in EPR
In this paper I assess the adequacy of no-conspiracy conditions employed in
the usual derivations of the Bell inequality in the context of EPR
correlations. First, I look at the EPR correlations from a purely
phenomenological point of view and claim that common cause explanations of
these cannot be ruled out. I argue that an appropriate common cause explanation
requires that no-conspiracy conditions are re-interpreted as mere common
cause-measurement independence conditions. In the right circumstances then,
violations of measurement independence need not entail any kind of conspiracy
(nor backwards in time causation). To the contrary, if measurement operations
in the EPR context are taken to be causally relevant in a specific way to the
experiment outcomes, their explicit causal role provides the grounds for a
common cause explanation of the corresponding correlations.Comment: 20 pages, 1 figur
Kepler RR Lyrae stars: beyond period doubling
We examined the complete short cadence sample of Kepler RR Lyrae stars to
further investigate the recently discovered dynamical effects such as period
doubling and additional modes. Here we present the findings on four stars. V450
Lyr may be a non-classical double-mode RR Lyrae star pulsating in the
fundamental mode and the second overtone. In three cases we observe the
interaction of three different modes. Since the period ratios are close to
resonant values, we observe quasi-repetiting patterns in the pulsation cycles
in the stars. These findings support the mode-resonance explanations of the
Blazhko effect.Comment: 2 pages, 1 figure. Proceedings of the 301st IAU Symposium, Precision
Asteroseismology, August 2013, Wroc{\l}aw. V2: small corrections to the
wordin
The relationship between landslide activity and weather: examples from Hungary
International audienceThe paper presents the impact of irregular rainfall events triggering landslides in the regional context of landslides in Hungary. The author?s experience, gathered from decades of observations, confirms that landslide processes are strongly correlate with precipitation events in all three landscape types (hill regions of unconsolidated sediments; high bluffs along river banks and lake shores; mountains of Tertiary stratovolcanoes). Case studies for each landscape type underline that new landslides are triggered and old ones are reactivated by extreme winter precipitation events. This assertion is valid mainly for shallow and translational slides. Wet autumns favour landsliding, while the triggering influence of intense summer rainfalls is of a subordinate nature. A recent increasing problem lies in the fact that on previously unstable slopes, stabilised during longer dry intervals, an intensive cultivation starts, thus increasing the damage caused by movements during relatively infrequent wet winters
Intransitivity and coexistence in four species cyclic games
Intransitivity is a property of connected, oriented graphs representing
species interactions that may drive their coexistence even in the presence of
competition, the standard example being the three species Rock-Paper-Scissors
game. We consider here a generalization with four species, the minimum number
of species allowing other interactions beyond the single loop (one predator,
one prey). We show that, contrary to the mean field prediction, on a square
lattice the model presents a transition, as the parameter setting the rate at
which one species invades another changes, from a coexistence to a state in
which one species gets extinct. Such a dependence on the invasion rates shows
that the interaction graph structure alone is not enough to predict the outcome
of such models. In addition, different invasion rates permit to tune the level
of transitiveness, indicating that for the coexistence of all species to
persist, there must be a minimum amount of intransitivity.Comment: Final, published versio
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
Molecular analysis of S-haplotypes in peach, a self-compatible Prunus species
The most commercially grown peach [Prunus persica (L.) Batsch.]
cultivars do not require cross-pollination for reasonable fruit set;
however, self-incompatibility is a well-known feature within the
Prunoideae subfamily. Isoelectric focusing and native polyacrylamide
gel electrophoresis of S-ribonucleases; PCR analyses of S-RNase and
S-haplotype-specific F-box genes as well as DNA sequencing were carried
out to survey the self- (in)compatibility allele pool and to uncover
the nature of self-compatibility in peach. From 25 cultivars and
hybrids with considerable diversity in phenotype and origin, only two
S-haplotypes were detected. Allele identity could be checked by exact
length determination of the PCR-amplified fragments and/or partial
sequencing of the peach S-1-, S-2-, and Prunus davidiana (Carr.)
Franch. S-1 RNases. S-RNases of peach were detected to possess
ribonuclease activity, and a single nucleotide polymorphism in the
S,-RNase was shown, which represents a synonymous substitution and does
not change the amino acid present at the position in the protein. A
700-bp fragment of the peach SFB gene was PCR-amplified, which is
similar to the fragment size of functional Prunus L. SFBs. All data
obtained in this study may support the contribution of genes outside
the S-locus to the self-compatible phenotype of peaches
Frequentist coverage of adaptive nonparametric Bayesian credible sets
We investigate the frequentist coverage of Bayesian credible sets in a
nonparametric setting. We consider a scale of priors of varying regularity and
choose the regularity by an empirical Bayes method. Next we consider a central
set of prescribed posterior probability in the posterior distribution of the
chosen regularity. We show that such an adaptive Bayes credible set gives
correct uncertainty quantification of "polished tail" parameters, in the sense
of high probability of coverage of such parameters. On the negative side, we
show by theory and example that adaptation of the prior necessarily leads to
gross and haphazard uncertainty quantification for some true parameters that
are still within the hyperrectangle regularity scale.Comment: Published at http://dx.doi.org/10.1214/14-AOS1270 in the Annals of
Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical
Statistics (http://www.imstat.org
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