Influence of the temperature on the depinning transition of driven interfaces

We study the dynamics of a driven interface in a two-dimensional random-field Ising model close to the depinning transition at small but finite temperatures T using Glauber dynamics. A square lattice is considered with an interface initially in (11)-direction. The drift velocity v is analyzed for the first time using finite size scaling at T = 0 and additionally finite temperature scaling close to the depinning transition. In both cases a perfect data collapse is obtained from which we deduce beta = 1/3 for the exponent which determines the dependence of v on the driving field, nu = 1 for the exponent of the correlation length and delta = 5 for the exponent which determines the dependence of v on T.Comment: 5 pages, Latex, Figures included, to appear in Europhys. Let

The Cultivation of Crabs Rhizophora ( Scyila Serrata ) with a Kind of the Weft of Which Different

This research was conducted from March to April with 2013, and held at the Fisheries Agency and Serdang Bedagai Regency in the North Sumatra town of Pari. The purpose and benefits of this research is to investigate the kind of feed which was able to speed growth and accelerate the growth of crab. The method is applicable in the experimental methods are using design random complete ( ral ) one factor by 4 standard treatment. Treatment applied in this research is the feed, Rucah Fish+ pellets, Pellet+ Snails Mas, Rucah Fish, Snails Mas. The best results of the best of this research namely by feed on fish rucah with the average growth absolute weights absolute 56,67 grams, the average daily growth rate of 5,37% and average egg growth rara of 488,89%

Microscopic theory for the light-induced anomalous Hall effect in graphene

We employ a quantum Liouville equation with relaxation to model the recently observed anomalous Hall effect in graphene irradiated by an ultrafast pulse of circularly polarized light. In the weak-field regime, we demonstrate that the Hall effect originates from an asymmetric population of photocarriers in the Dirac bands. By contrast, in the strong-field regime, the system is driven into a non-equilibrium steady state that is well-described by topologically non-trivial Floquet-Bloch bands. Here, the anomalous Hall current originates from the combination of a population imbalance in these dressed bands together with a smaller anomalous velocity contribution arising from their Berry curvature. This robust and general finding enables the simulation of electrical transport from light-induced Floquet-Bloch bands in an experimentally relevant parameter regime and creates a pathway to designing ultrafast quantum devices with Floquet-engineered transport properties

Thermal rounding of the depinning transition

We study thermal effects at the depinning transition by numerical simulations of driven one-dimensional elastic interfaces in a disordered medium. We find that the velocity of the interface, evaluated at the critical depinning force, can be correctly described with the power law $v\sim T^\psi$, where $\psi$ is the thermal exponent. Using the sample-dependent value of the critical force, we precisely evaluate the value of $\psi$ directly from the temperature dependence of the velocity, obtaining the value $\psi = 0.15 \pm 0.01$. By measuring the structure factor of the interface we show that both the thermally-rounded and the T=0 depinning, display the same large-scale geometry, described by an identical divergence of a characteristic length with the velocity $\xi \propto v^{-\nu/\beta}$, where $\nu$ and $\beta$ are respectively the T=0 correlation and depinning exponents. We discuss the comparison of our results with previous estimates of the thermal exponent and the direct consequences for recent experiments on magnetic domain wall motion in ferromagnetic thin films.Comment: 6 pages, 3 figure

Kelulushidupan dan Pertumbuhan Ikan Tapah (Wallago Leeri) dengan Frekuensi Pemberian Pakan yang Berbeda

The research was conducted on June-August 2015 in Hatchery on Jl.TamanKarya, Pekanbaru-Riau Province. The aim of research was determine the effect ofdifferent feeding frequency on survival and growth of Wallago leeri In this research, 3treatments with 3 replications was applied. Fish used in this research were 10 to 15 cmin length. Stocking density of fish was 70 fish/m3. Fish meal frequency applied was 2, 3and 4 times/day. Fish diet used in the research was trash fish . Based on Anova analysis,results showed that the fish meal distribution of 4 times/day gave the best result on dailyweight growth of 1,86 g, absolute length growth 3,70 cm survival rate of 100 %. andfish diet efficiency 58,21

Resonance structure in the Li^- photodetachment cross section

We report on the first observation of resonance structure in the total cross section for the photodetachment of Li^-. The structure arises from the autodetaching decay of doubly excited ^1P states of Li^- that are bound with respect to the 3p state of the Li atom. Calculations have been performed for both Li^- and H^- to assist in the identification of these resonances. The lowest lying resonance is a symmetrically excited intrashell resonance. Higher lying asymmetrically excited intershell states are observed which converge on the Li(3p) limit.Comment: 4 pages, 2 figure, 19 references, RevTeX, figures in ep