Genuine Non-Self-Averaging and Ultra-Slow Convergence in Gelation

In irreversible aggregation processes droplets or polymers of microscopic size successively coalesce until a large cluster of macroscopic scale forms. This gelation transition is widely believed to be self-averaging, meaning that the order parameter (the relative size of the largest connected cluster) attains well-defined values upon ensemble averaging with no sample-to-sample fluctuations in the thermodynamic limit. Here, we report on anomalous gelation transition types. Depending on the growth rate of the largest clusters, the gelation transition can show very diverse patterns as a function of the control parameter, which includes multiple stochastic discontinuous transitions, genuine non-self-averaging and ultra-slow convergence of the transition point. Our framework may be helpful in understanding and controlling gelation.Comment: 8 pages, 10 figure

Electron Magnetic Resonance

Contains report on one research project.Joint Services Electronics Programs (U. S. Army, U. S. Navy, and U. S. Air Force) under Contract DA 28-043-AMC-02536(E

Multinet : enabler for next generation enterprise wireless services

Wireless communications are currently experiencing a fast migration toward the beyond third-generation (B3G)/fourth generation (4G) era. This represents a generational change in wireless systems: new capabilities related to mobility and new services support is required and new concepts as individual-centric, user-centric or ambient-aware communications are included. One of the main restrictions associated to wireless technology is mobility management, this feature was not considered in the design phase; for this reason, a complete solution is not already found, although different solutions are proposed and are being proposed. In MULTINET project, features as mobility and multihoming are applied to wireless network to provide the necessary network and application functionality enhancements for seamless data communication mobility considering end-user scenario and preferences. The aim of this paper is to show the benefits of these functionalities from the Service Providers and final User point of view

Measuring topology in a laser-coupled honeycomb lattice: From Chern insulators to topological semi-metals

Ultracold fermions trapped in a honeycomb optical lattice constitute a versatile setup to experimentally realize the Haldane model [Phys. Rev. Lett. 61, 2015 (1988)]. In this system, a non-uniform synthetic magnetic flux can be engineered through laser-induced methods, explicitly breaking time-reversal symmetry. This potentially opens a bulk gap in the energy spectrum, which is associated with a non-trivial topological order, i.e., a non-zero Chern number. In this work, we consider the possibility of producing and identifying such a robust Chern insulator in the laser-coupled honeycomb lattice. We explore a large parameter space spanned by experimentally controllable parameters and obtain a variety of phase diagrams, clearly identifying the accessible topologically non-trivial regimes. We discuss the signatures of Chern insulators in cold-atom systems, considering available detection methods. We also highlight the existence of topological semi-metals in this system, which are gapless phases characterized by non-zero winding numbers, not present in Haldane's original model.Comment: 30 pages, 12 figures, 4 Appendice

Topological Wilson-loop area law manifested using a superposition of loops

We introduce a new topological effect involving interference of two meson loops, manifesting a path-independent topological area dependence. The effect also draws a connection between quark confinement, Wilson-loops and topological interference effects. Although this is only a gedanken experiment in the context of particle physics, such an experiment may be realized and used as a tool to test confinement effects and phase transitions in quantum simulation of dynamic gauge theories.Comment: Superceding arXiv:1206.2021v1 [quant-ph

Determinação do teor de metilxantinas e análise da variabilidade genética de seis variedades populares de erva-mate.

Os objetivos deste estudo foram determinar os conteúdos de metilxantinas e cafeína em folhas maduras de seis “variedades” populares de erva-mate (Ilex paraguariensis St. Hil. Aquifoliaceae) e avaliar a distância genética entre estas diferentes “variedades” por meio de marcadores RAPD (Random Amplified Polimorphic DNA). A concentração de metilxantinas foi determinada por espectrofotometria UV e a de cafeína por cromatografia gasosa. Foram estudadas seis “variedades” de erva-mate: nativa, folha grande, folha brilhosa, talo-roxo e folha cobre (consideradas variedades botânicas Ilex paraguariensis var. paraguariensis) e a “variedade” peluda (considerada variedade botânica Ilex paraguariensis var. vestita). A “variedade” folha cobre apresentou o maior conteúdo de metilxantinas (1,65 g%) e de cafeína (1,29 g%). A “variedade” peluda mostrou o menor teor de metilxantinas (0,25 g%) e de cafeína (0,06 g%). A diferença entre a quantidade de metilxantinas e cafeína deve-se provavelmente ao conteúdo das outras metilxantinas presentes na erva-mate, como a teobromina e a teofilina. Estas diferenças não foram observadas através de marcadores RAPD. De acordo com as análises do polimorfismo gerado pelo marcador RAPD, foram formados dois grupos distintos, os quais mostraram 58% de similaridade entre eles, utilizando o coeficiente de Jaccard. Um dos grupos incluiu as “variedades” folha cobre, peluda e nativa e o outro as “variedades” folha grande, brilhosa e talo roxo.bitstream/item/16992/1/Boletim_de_pesquisa08.pd

Large deviations for a damped telegraph process

In this paper we consider a slight generalization of the damped telegraph process in Di Crescenzo and Martinucci (2010). We prove a large deviation principle for this process and an asymptotic result for its level crossing probabilities (as the level goes to infinity). Finally we compare our results with the analogous well-known results for the standard telegraph process

Automatic Discovery of Complementary Learning Resources

Proceedings of: 6th European Conference of Technology Enhanced Learning, EC-TEL 2011, Palermo, Italy, September 20-23, 2011.Students in a learning experience can be seen as a community working simultaneously (and in some cases collaboratively) in a set of activities. During these working sessions, students carry out numerous actions that affect their learning. But those actions happening outside a class or the Learning Management System cannot be easily observed. This paper presents a technique to widen the observability of these actions. The set of documents browsed by the students in a course was recorded during a period of eight weeks. These documents are then processed and the set with highest similarity with the course notes are selected and recommended back to all the students. The main problem is that this user community visits thousands of documents and only a small percent of them are suitable for recommendation. Using a combination of lexican analysis and information retrieval techniques, a fully automatic procedure to analyze these documents, classify them and select the most relevant ones is presented. The approach has been validated with an empirical study in an undergraduate engineering course with more than one hundred students. The recommended resources were rated as "relevant to the course" by the seven instructors with teaching duties in the course.Work partially funded by the Learn3 project, “Plan Nacional de I+D+I TIN2008-05163/TSI”, the Acción Integrada Ref. DE2009-0051, the “Emadrid: Investigación y desarrollo de tecnologías para el e-learning en la Comunidad de Madrid” project (S2009/TIC-1650) and TELMA Project (Plan Avanza TSI-020110-2009-85)

Avaliação e conservação do cavalo pantaneiro.

Os cavalos introduzidos no Pantanal pelos conquistadores durante a epoca da colonizacao, encontraram na regiao condicoes ambientais propicias para sua multiplicacao. Como consequencia dos processos adaptativos e da selecao natural por mais de dois seculos e com pouca ou nenhuma interferencia antropica, surgiu um tipo adaptado ao meio. Com o desenvolvimento da pecuaria na regiao, o cavalo Pantaneiro constituiu-se num fator de importancia economica e social, tornando-se imprescindivel em trabalhos de gado e no transporte regional. No final do seculo XIX, a raca entrou em declinio principalmente devido a doenca conhecida como Peste das cadeiras e, posteriormente, outras ameacas como cruzamentos indiscriminados com outras racas e, mais recentemente a Anemia Infecciosa Equina (AIE). Em 1972, trabalhos de conservacao deste ecotipo tiveram inicio com a criacao da Associacao Brasileira dos Criadores de Cavalo Pantaneiro (ABCCP) e, posteriormente com a iniciativa de outras instituicoes governamentais. Visando conservar e incentivar a criacao do cavalo Pantaneiro, a EMBRAPA/CPAP implantou em 1988, um nucleo de criacao de cavalos Pantaneiro na fazenda Nhumirim, sub-regiao da Nhecolandia, Corumba, MS. Neste nucleo sao realizados estudos relacionados aos aspectos nutricionais, reprodutivos, geneticos, sanitarios e de performance. Paralelamente, o CPAP vem realizando trabalhos de caracterizacao do sistema de criacao no Pantanal, estudos sobre a origem e caracterizacao genetica da raca. Em conjunto com a ABCCP estao sendo analisadas as informacoes contidas nas fichas de registros genealogicos para estudo dos aspectos morfologicos.bitstream/item/37578/1/CT21.pd