Study of branes with variable tension

In this work we study a brane world model with variable tension which gives rise to four dimensional cosmologies. The brane worlds obtained correspond to E\"{o}tv\"{o}s branes whose (internal) geometry can be casted as either a four dimensional (A)dS$_{4}$ or a standard radiation period cosmology. The matter dominated period is discussed as well

A way of decoupling gravitational sources in pure Lovelock gravity

We provide an algorithm that shows how to decouple gravitational sources in Pure Lovelock gravity. This method allows to obtain several new and known analytic solutions of physical interest in scenarios with extra dimensions and with presence of higher curvature terms. Furthermore, using our method, it is shown that applying the minimal geometric deformation to the Anti de Sitter space time it is possible to obtain regular black hole solutions.Comment: Accepted for publication in Eur.Phys.J.

Thermodynamic extended phase space and P−VP-V criticality of black holes at Pure Lovelock gravity

In this work the \textit{chemistry} of asymptotically AdS black hole, charged and uncharged, solutions of Pure Lovelock gravity is discussed. For this the mass parameter of black holes is identified with the enthalpy of the system together with the promotion of the cosmological constant to a thermodynamics variable proportional to the \textit{pressure} of the system. The equations of state for both, charged and uncharged, are obtained. It is shown that the charged case behaves as a Van der Waals fluid. The existence of a first order phase transition between small stable/large stable black hole, which is a reminiscent of the liquid/gas transition, is found. The critical exponents of the thermal evolution, for different cases of interest, are similar to those of the Van der Waals fluid

Picasso, Matisse, or a Fake? Automated Analysis of Drawings at the Stroke Level for Attribution and Authentication

This paper proposes a computational approach for analysis of strokes in line drawings by artists. We aim at developing an AI methodology that facilitates attribution of drawings of unknown authors in a way that is not easy to be deceived by forged art. The methodology used is based on quantifying the characteristics of individual strokes in drawings. We propose a novel algorithm for segmenting individual strokes. We designed and compared different hand-crafted and learned features for the task of quantifying stroke characteristics. We also propose and compare different classification methods at the drawing level. We experimented with a dataset of 300 digitized drawings with over 80 thousands strokes. The collection mainly consisted of drawings of Pablo Picasso, Henry Matisse, and Egon Schiele, besides a small number of representative works of other artists. The experiments shows that the proposed methodology can classify individual strokes with accuracy 70%-90%, and aggregate over drawings with accuracy above 80%, while being robust to be deceived by fakes (with accuracy 100% for detecting fakes in most settings)

Result s of Experimental Researches of Plant Material Twin-Screw Compactor

The usage of latest technological means of plant material compaction will reduce production costs by saving the livestock nutrients during a storage period. The results of twin-screw compactor experimental researches are presented. They will enable to reduce production costs by saving livestock nutrients during storage. The data will provide plant material with high output density avoiding the relaxation effect. Mathematical equations of productivity, power capacity and energy intensity are given depending on the design and kinematic parameters. Surfaces of mathematical equations’ responses are also presented

SINGER, the System wide Information NEtwork on Genetic Resources of CGIAR

The System-Wide Information System for Genetic Resources (SINGER) (http://www.singer.cgiar.org/) is an online catalogue of crop collections that provides inventories of conserved agricultural diversity and offers primary access for identifying and locate where samples are conserved. SINGER provides a single entry point into the crop collections' inventories of 11 centres of the Consultative Group on International Agricultural Research (CGIAR) and the Asian Vegetable Research and Development Centre (AVRDC). SINGER enables users to access the description of conserved samples, the distribution of samples worldwide, the location of the collected sample, and information on the site where the original sample was collected. It is possible to find a set of plants meeting selected criteria by choosing a geographical area on Google Maps, acquiring climate data from WorldClim's set of global climate layers (http://www.worldclim.org/), and using LocClim, a local monthly climate estimator from the Food and Agriculture Organization (FAO) (http://www.fao.org/sd/locclim/srv/locclim.home). An online sample-ordering gateway has been added to SINGER, so that anyone can now access material via a 'shopping-cart' function and send a request to the appropriate germplasm providers. SINGER is based on the international standard called the MultiCrop Passport data (FAO/Bioversity) which is the 'Identity card' of the sample conserved: vernacular name, taxonomy, donor name, site of collect, georeferences, etc., and the crop descriptors' lists (Bioversity International and partners). In the future, the newly developed Crop ontology will be embedded into SINGER's metadata. SINGER is a product of the CGIAR System-wide Genetic Resources Programme (SGRP). This programme unites several CGIAR research centres in a common effort to sustain biodiversity for current and future generations. Much of SGRP's efforts to date have focused on plant genetic resources; however attention is also being given to forest, animal, and aquatic genetic resources, given the interdependence of all components of agricultural biodiversity. The CGIAR is committed to helping build a global information portal of genetic resources, and SGRP serves to bring together the CGIAR Centres in this common mission. By linking SINGER with other types of data, such as information from breeders, the future global germplasm information portal will strengthen and facilitate SINGER's role as a gateway to the world's agricultural biodiversity. (Texte intégral