Engineering large end-to-end correlations in finite fermionic chains

We explore deformations of finite chains of independent fermions which give rise to large correlations between their extremes. After a detailed study of the Su-Schrieffer-Heeger (SSH) model, the trade-off curve between end-to-end correlations and the energy gap of the chains is obtained using machine-learning techniques, paying special attention to the scaling behavior with the chain length. We find that edge-dimerized chains, where the second and penultimate hoppings are reinforced, are very often close to the optimal configurations. Our results allow us to conjecture that, given a fixed gap, the maximal attainable correlation falls exponentially with the system size. Study of the entanglement entropy and contour of the optimal configurations suggest that the bulk entanglement pattern is minimally modified from the clean case

O leite de cabra como alimento funcional.

bitstream/item/52663/1/Midia-O-leite-como-alimento.pdfDisponível também em: http://www.capritec.com.br/artigos_embrapa030609a.htm; http://www.paginarural.com.br/artigos_detalhes.php?id=630&imprimir=1

Static Pairwise Annihilation in Complex Networks

We study static annihilation on complex networks, in which pairs of connected particles annihilate at a constant rate during time. Through a mean-field formalism, we compute the temporal evolution of the distribution of surviving sites with an arbitrary number of connections. This general formalism, which is exact for disordered networks, is applied to Kronecker, Erd\"os-R\'enyi (i.e. Poisson) and scale-free networks. We compare our theoretical results with extensive numerical simulations obtaining excellent agreement. Although the mean-field approach applies in an exact way neither to ordered lattices nor to small-world networks, it qualitatively describes the annihilation dynamics in such structures. Our results indicate that the higher the connectivity of a given network element, the faster it annihilates. This fact has dramatic consequences in scale-free networks, for which, once the ``hubs'' have been annihilated, the network disintegrates and only isolated sites are left.Comment: 7 Figures, 10 page

Produtos regionais derivados de leite de cabras e perspectivas de mercado para o Brasil.

No Brasil, e especificamente no Nordeste, apesar do mercado potencial, a produção e processamento de leite de cabra ainda e incipiente, necessitando, portanto, de majores estudos quanta a tecnologia de fabricação de queijos artesanais e industriais, implantação e adaptação de novas tipos de queijos, bem como, tipificação e proteção dos queijos tradicionais como o Coalho, que após serem produzidos de maneira segura e com qualidade superior, podera ser perfeitamente tipificado e protegido, a exemplo dos queijos artesanais franceses fabricados com leite de cabra. Desde 1990, estudos realizados na Embrapa Caprinos, tern mostrado a possibilidade de fabricação de queijos Europeus como tipo Pelardon, Ricota, Tome, entre outros. Na perspectiva de obtenção de novos produtos derivados do leite, foram realizados experimentos visando a identificação de proteases vegetais e sua aplicabilidade na fabricação de queijos artesanais. Em resultados preliminares, observou-se que sementes de girassol (Helianthus annuus) tinham atividade coagulante no leite de cabra e vaca. Foi utilizada a K-caseina bovina como substrato modelo para proteases obtidas de sementes de girassol e comparado com quimosina. Um peptideo com mesma mobilidade eletroforetica de para-kappa-caseina foi observado mostrando o potencial deste extrato vegetal na fabricação de queijos. A identificação de novas enzimas, adaptação e produção de novas tipos de queijos a partir da tecnologia artesanal podera ser uma alternativa na geração de novas derivados do leite de cabra tanto para os mercados regionais, nacionais como internacionais

Anisotropy in nanocellular polymers promoted by the addition of needle‐like sepiolites

This work presents a new strategy for obtaining nanocellular materials with high anisotropy ratios by means of the addition of needle‐like nanoparticles. Nanocellular polymers are of great interest due to their outstanding properties, whereas anisotropic structures allow the realization of improved thermal and mechanical properties in certain directions. Nanocomposites based on poly(methyl methacrylate) (PMMA) with nanometric sepiolites are generated by extrusion. From the extruded filaments, cellular materials are produced using a two‐step gas dissolution foaming method. The effect of adding various types and contents of sepiolites is investigated. As a result of the extrusion process, the needle‐like sepiolites are aligned in the machine direction in the solid nanocomposites. Regarding the cellular materials, the addition of sepiolites allows one to obtain anisotropic nanocellular polymers with cell sizes of 150 to 420 nm and cell nucleation densities of 1013–1014 nuclei cm−3 and presenting anisotropy ratios ranging from 1.38 to 2.15, the extrusion direction being the direction of the anisotropy. To explain the appearance of anisotropy, a mechanism based on cell coalescence is proposed and discussed. In addition, it is shown that it is possible to control the anisotropy ratio of the PMMA/sepiolite nanocellular polymers by changing the amount of well‐dispersed sepiolites in the solid nanocomposites

Processamento de produtos regionais derivados do leite de cabra na França e perspectivas para o Brasil.

Resumo: Os queijos com leite de cabra encontram-se entre um dos primeiros alimentos manufaturados pelo homem, sendo os primeiros registros de fabricação observados no período neolítico. A evolução deste alimento ocorreu de forma impressionante, uma vez que algumas tecnologias continuam a serem realizadas há séculos sem perderem suas propriedades. Com o avanço da ciência e da tecnologia industrial, novos produtos com características especificas estão sendo realizados, no entanto, técnicas milenares continuam sendo utilizadas ou adaptadas à nova realidade. Estas tecnologias, a cada dia, estão sendo mais protegidas pela legislação de cada país de origem, a exemplo dos "Labels", AOC, (Apellation de Originne controlé), etc. que protegem os produtos lácteos franceses. No Brasil, apesar do mercado potencial, a produção e processamento de leite de cabra ainda é incipiente, necessitando, portanto, de maiores estudos quanto à tecnologia de fabricação de queijos artesanais, implantação e adaptação de novos tipos de queijos, bem como, tipificação e proteção dos queijos tradicionais como o Coalho, que após serem produzidos de maneira segura e com qualidade superior, poderá ser perfeitamente tipificado e protegido, a exemplo dos queijos artesanais franceses fabricados com leite de cabra. [Manufacture of regional products derived from goat milk in ranceand perspectives in Brazil]. Abstract: Cheese made from goat milk is among one of the first manufactured food made by man,being the first registers of manufacture observed during the neolitic. The evolution of this foodoccerved in a very impressing speed, since some tecnhologies are still being used by centurieswithout losinp their properties. With the progress of science and industrial technology new productswith specific characteristics are being elaborated, therefore, millennium techniques are still beingused or adapted to a new reality. These technologies, day by day, have been more protected by thelegislation of their countries, e.g. "Labels", AOC, (Apellation de Originne Controlé), etc. whichprotects the french milk products. In Brazil, athought the potential market the production andprocessing of goat milk is still at the beginning, therefore requiring more research according themanufaturing technology of "homemade" cheese, implantation and adaptation of new types ofcheese, as wellas characterist and protection of traditional cheese such the "Coalho", after beingmanufactered in a safe way and with higt quality it will be able to be "characterized" and protectedas the homemade "Franch" cheese made of goat cheese

Barotropic thin shells with linear EOS as models of stars and circumstellar shells in general relativity

The spherically symmetric thin shells of the barotropic fluids with the linear equation of state are considered within the frameworks of general relativity. We study several aspects of the shells as completely relativistic models of stars, first of all the neutron stars and white dwarfs, and circumstellar shells. The exact equations of motion of the shells are obtained. Also we calculate the parameters of the equilibrium configurations, including the radii of static shells. Finally, we study the stability of the equilibrium shells against radial perturbations.Comment: final version; ps-version of figure is available by email request to [email protected]

Iogurte batido de leite de cabra adicionado de polpa de frutas tropicais.

bitstream/CNPC/20231/1/ct32.pd

A Time-Varying Non-Parametric Methodology for Assessing Changes in QT Variability Unrelated to Heart Rate Variability

OBJECTIVE: To propose and test a novel methodology to measure changes in QT interval variability (QTV) unrelated to RR interval variability (RRV) in non-stationary conditions. METHODS: Time-frequency coherent and residual spectra representing QTV related (QTVrRRV) and unrelated (QTVuRRV) to RRV, respectively, are estimated using time-frequency Cohen's class distributions. The proposed approach decomposes the non-stationary output spectrum of any two-input one-output model with uncorrelated inputs into two spectra representing the information related and unrelated to one of the two inputs, respectively. An algorithm to correct for the bias of the time-frequency coherence function between QTV and RRV is proposed to provide accurate estimates of both QTVuRRV and QTVrRRV. Two simulation studies were conducted to assess the methodology in challenging non-stationary conditions and data recorded during head-up tilt in 16 healthy volunteers were analyzed. RESULTS: In the simulation studies, QTVuRRV changes were tracked with only a minor delay due to the filtering necessary to estimate the non-stationary spectra. The correlation coefficient between theoretical and estimated patterns was >0.92 even for extremely noisy recordings (SNR in QTV =-10dB). During head-up tilt, QTVrRRV explained the largest proportion of QTV, whereas QTVuRRV showed higher relative increase than QTV or QTVrRRV in all spectral bands (P<0.05 for most pairwise comparisons). CONCLUSION: The proposed approach accurately tracks changes in QTVuRRV. Head-up tilt induced a slightly greater increase in QTVuRRV than in QTVrRRV. SIGNIFICANCE: The proposed index QTVuRRV may represent an indirect measure of intrinsic ventricular repolarization variability, a marker of cardiac instability associated with sympathetic ventricular modulation and sudden cardiac death

Tipificación de tres cistáceas linneanas

Se designan lectótipos para Cistus squamatus L., C. tuberaria L. y C. umbellatus L. (Cistaceae). Estos nombres se aplican a tres especies en la actualidad clasificadas dentro de los géneros Helianthemum Mill., Xolantha Raf. y Halimium (Dunal) Spach, respectivamente.Tipification of three Linnaean plant names of Cistaceae. Lectotypes for Cistus squamatus L., C. tuberaria L. y C. umbellatus L. (Cistaceae) are designated. These names are apply to three species, currently classified in the genus Helianthemum Mill., Xolantha Raf. and Halimium (Dunal) Spach, respectively