Fluctuation Formula in the Nose-Hoover thermostated Lorentz gas

In this paper we examine numerically the Gallavotti-Cohen fluctuation formula for phase-space contraction rate and entropy production rate fluctuations in the Nos\'e-Hoover thermostated periodic Lorentz gas. Our results indicate that while the phase-space contraction rate fluctuations violate the fluctuation formula near equilibrium states, the entropy production rate fluctuations obey this formula near and far from equilibrium states as well.Comment: 4 pages, 8 figure

Building valoristaion strategies for biodiverse products - the approach

The market valorisation of ‘diverse food products’ is crucial to increase diversity in farming systems. It involves multiple actors, from the field to the table, and requires an integrated approach to take into account several dimensions involved

High speed imaging of traveling waves in a granular material during silo discharge

We report experimental observations of sound waves in a granular material during resonant silo discharge called silo music. The grain motion was tracked by high speed imaging while the resonance of the silo was detected by accelerometers and acoustic methods. The grains do not oscillate in phase at neighboring vertical locations, but information propagates upward in this system in the form of sound waves. We show that the wave velocity is not constant throughout the silo, but considerably increases towards the lower end of the system, suggesting increased pressure in this region, where the flow changes from cylindrical to converging flow. In the upper part of the silo the wave velocity matches the sound velocity measured in the same material when standing (in the absence of flow). Grain oscillations show a stick-slip character only in the upper part of the silo.Comment: 5 pages, 5 figures, accepted to Phys. Rev.

The effect of companion planting on the abundance of pest complex and its parasitism rate on white cabbage

The findings of this paper could help to develop and maintain a sustainable cabbage production by the enhancement of natural pest control with the help of companion planting. Our results indicate that Lobularia maritima (Brassicaceae) could be used to attract pests of cruciferous plants away from the crop. Centaurea cyanus (Asteraceae) and Fagopyrum esculentum (Polygonaceae) could be used to suppress pests of cruciferous crops and to increase parasitism rate by fostering parasitoids

Building Valorisation Strategies for Biodiverse Products - Case Studies

The market valorisation of ‘diverse food products’ is crucial to promote agrobiodiversity. Despite the differences due to the specific contexts, valorisation strategies show relevant common features

Testing Ho\v{r}ava-Lifshitz gravity using thin accretion disk properties

Recently, a renormalizable gravity theory with higher spatial derivatives in four dimensions was proposed by Horava. The theory reduces to Einstein gravity with a non-vanishing cosmological constant in IR, but it has improved UV behaviors. The spherically symmetric black hole solutions for an arbitrary cosmological constant, which represent the generalization of the standard Schwarzschild-(A)dS solution, has also been obtained for the Horava-Lifshitz theory. The exact asymptotically flat Schwarzschild type solution of the gravitational field equations in Horava gravity contains a quadratic increasing term, as well as the square root of a fourth order polynomial in the radial coordinate, and it depends on one arbitrary integration constant. The IR modified Horava gravity seems to be consistent with the current observational data, but in order to test its viability more observational constraints are necessary. In the present paper we consider the possibility of observationally testing Horava gravity by using the accretion disk properties around black holes. The energy flux, temperature distribution, the emission spectrum as well as the energy conversion efficiency are obtained, and compared to the standard general relativistic case. Particular signatures can appear in the electromagnetic spectrum, thus leading to the possibility of directly testing Horava gravity models by using astrophysical observations of the emission spectra from accretion disks.Comment: 7 pages, 4 figures. V2: minor additions and references added; to appear in Phys. Rev.

THE MATHEMATICAL MODEL OF PLUG FLOW CONVEYING

In the paper the movement characteristics of a special plug moving in the pneumatic pipe are described considering forces influencing the plug that acceleration, velocity, and the path made by the plug. The state of motion in horizontal and vertical pipe sections, respectively, in a bend built into the pipe section will be determined. The bend examined in this paper is laying in the vertical plane and is connecting a horizontal pipe section with a vertical one. Equations describing the movement characteristics are approximative because authors simplify the physical process, neglect different things. In the knowledge of the movement characteristics the data of the delivering machine can be determined

APPROXIMATE CALCULATION OF PRESSURE DROP IN BENDS BUILT IN PNEUMATIC CONVEYING PIPES IN THE CASE OF HIGH DENSITY CONVEYING

In this paper a computing method is described for the approximate determination of pressure drop in bends of different plain built into pneumatic pipes in the case of high density conveying. Particles moving in the bend decelerate because of the force acting on them. The conveying gas flow accelerates the decelerated particles in the connecting straight pipe section following the bend to a limit velocity belonging to the straight section if it is long enough. Pressure drop in the bend is approximately equal to the pressure drop necessary for accelerating the material again. Maximum velocity change occurs in a bend of vertical plane starting from vertical position, therefore this bend has the greatest pressure drop, too