Common adversaries form alliances: modelling complex networks via anti-transitivity

Anti-transitivity captures the notion that enemies of enemies are friends, and arises naturally in the study of adversaries in social networks and in the study of conflicting nation states or organizations. We present a simplified, evolutionary model for anti-transitivity influencing link formation in complex networks, and analyze the model's network dynamics. The Iterated Local Anti-Transitivity (or ILAT) model creates anti-clone nodes in each time-step, and joins anti-clones to the parent node's non-neighbor set. The graphs generated by ILAT exhibit familiar properties of complex networks such as densification, short distances (bounded by absolute constants), and bad spectral expansion. We determine the cop and domination number for graphs generated by ILAT, and finish with an analysis of their clustering coefficients. We interpret these results within the context of real-world complex networks and present open problems

A soja no Brasil: história e estatística.

Origem e distribuicao no mundo; Introducao e primeiras experiencias no Brasil; Evolucao da producao; Destino da producao; Capacidade de processamento; Portos de embarque; Meios de transporte; Precos recebidos pelos produtores; Custos de producao.bitstream/item/23236/1/Doc21.pd

Comportement Sonochimique d'Oxydes d'Actinides Nanostructures

International audienceLes matériaux nanostructurés peuvent être définis comme des matériaux ayant une structuration de l’ordre de quelques nanomètres (typiquement de 1 à 10 nanomètres). [1] La nanostructuration des matériaux est un sujet d’étude important en raison de leurs propriétés physiques et chimiques intéressantes qui peuvent être optimisées en fonction de leur taille, morphologie et structure. Les particules nanométriques qui composent ces matériaux possèdent un grand rapport surface sur volume et permettent d’offrir une plus grande quantité de sites actifs par rapport à d’autres matériaux de taille plus importante. Par conséquent, les matériaux nanostructurés peuvent trouver des applications dans la catalyse, le biomédical, la synthèse de matériaux luminescents. Cependant, la nanostructuration des oxydes d’actinides et leur réactivité qui en résulte sont peu rapportées dans la littérature. [2] Des études récentes ont montré que la nanostructuration d’oxydes de plutonium semble jouer un rôle dans la formation sonochimique de colloïdes de Pu en solutions aqueuse

Evolution of Strigamia centipedes (Chilopoda): a first molecular assessment of phylogeny and divergence times

We present a first phylogenetic and temporal framework, with biogeographical insights, for the centipedes of the genus Strigamia, which are widespread predators in the forest soils of the Northern Hemisphere and comprise the evo-devo model species Strigamia maritima. The phylogeny was estimated by different methods of maximum likelihood and Bayesian inference from sequences of two mitochondrial (16S, COI) and two nuclear (18S, 28S) genes, obtained from 16 species from all major areas of the global range of the genus and encompassing most of the overall morphological and ecological diversity. Divergence times were estimated after calibration upon the fossil record of centipedes. We found that major lineages of extant species of Strigamia separated most probably around 60 million years (Ma) ago. The two most diverse lineages diversified during the last 30 Ma and are today segregated geographically, one in Europe and another in Eastern Asia. This latter region hosts a hitherto underestimated richness and anatomical diversity of species, including three still unknown, yet morphologically well distinct species, which are here described as new: Strigamia inthanoni sp. n. from Thailand, Strigamia korsosi sp. n. from the Ryukyu Islands and Strigamia nana sp. n. from Taiwan. The northern European model species S. maritima is more strictly related to the Eastern Asian lineage, from which it most probably separated around 35 Ma ago before the major diversification of the latter

Extração de DNA genômico de cereais de inverno na Embrapa Trigo.

bitstream/CNPT-2010/40600/1/p-co235.pd

Desempenho de cultivares de soja em áreas com diferentes niveis de infestação de Phialophora gregata.

bitstream/item/133629/1/ID10587-1992-1993sojaresultados-p107-110.pdfTrabalho apresentado na XXI Reunião de Pesquisa de Soja da Região Sul, Santa Rosa, 1993

The Tiered Radio Extragalactic Continuum Simulation (T-RECS)

We present the Tiered Radio Extragalactic Continuum Simulation (T-RECS): a new simulation of the radio sky in continuum, over the 150 MHz-20 GHz range. T-RECS models two main populations of radio galaxies: Active Galactic Nuclei (AGNs) and Star-Forming Galaxies (SFGs), and corresponding sub-populations. Our model also includes polarized emission over the full frequency range, which has been characterised statistically for each population using the available information. We model the clustering properties in terms of probability distributions of hosting halo masses, and use lightcones extracted from a high-resolution cosmological simulation to determine the positions of haloes. This limits the sky area for the simulations including clustering to a 25deg2 field of view. We compare luminosity functions, number counts in total intensity and polarization, and clustering properties of our outputs to up-to-date compilations of data and find a very good agreement. We deliver a set of simulated catalogues, as well as the code to produce them, which can be used for simulating observations and predicting results from deep radio surveys with existing and forthcoming radio facilities, such as the Square Kilometre Array (SKA).Comment: 20 pages, 11 figures, accepted by MNRA

Pathology of disappearing bone disease: a case report with immunohistochemical study.

A case of disappearing bone disease of the proximal femur is reported with histopathological and immunohistochemical studies. There was a densely packed cellular tissue, positive to endothelial antibodies, in areas of massive bone destruction. A more differentiated vascular tissue was present where trabecular cancellous or cortical bone was preserved with only focal zones of accelerated bone remodelling. The self-limited course correlates well with two phases of evolution of the histopathological lesions with neoplastic-like proliferation of endothelial cells corresponding to the rapid and massive bone destruction, and a later differentiation of the cells in mature vascular structures, but still with accelerated bone resorption which is partly compensated by appositional activity