9,236 research outputs found

    On the ultraviolet behaviour of quantum fields over noncommutative manifolds

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    By exploiting the relation between Fredholm modules and the Segal-Shale-Stinespring version of canonical quantization, and taking as starting point the first-quantized fields described by Connes' axioms for noncommutative spin geometries, a Hamiltonian framework for fermion quantum fields over noncommutative manifolds is introduced. We analyze the ultraviolet behaviour of second-quantized fields over noncommutative 3-tori, and discuss what behaviour should be expected on other noncommutative spin manifolds.Comment: 10 pages, RevTeX version, a few references adde

    No more time to stay ‘single’ in the detection of Anisakis pegreffii, A. simplex (s. s.) and hybridization events between them: a multi-marker nuclear genotyping approach

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    A multi-marker nuclear genotyping approach was performed on larval and adult specimens of Anisakis spp. (N = 689) collected from fish and cetaceans in allopatric and sympatric areas of the two species Anisakis pegreffii and Anisakis simplex (s. s.), in order to: (1) identify specimens belonging to the parental taxa by using nuclear markers (allozymes loci) and sequence analysis of a new diagnostic nuclear DNA locus (i.e. partial sequence of the EF1 α−1 nDNA region) and (2) recognize hybrid categories. According to the Bayesian clustering algorithms, based on those markers, most of the individuals (N = 678) were identified as the parental species [i.e. A. pegreffii or A. simplex (s. s.)], whereas a smaller portion (N = 11) were recognized as F1 hybrids. Discordant results were obtained when using the polymerase chain reaction–restriction fragment length polymorphisms (PCR–RFLPs) of the internal transcribed spacer (ITS) ribosomal DNA (rDNA) on the same specimens, which indicated the occurrence of a large number of ‘hybrids’ both in sympatry and allopatry. These findings raise the question of possible misidentification of specimens belonging to the two parental Anisakis and their hybrid categories derived from the application of that single marker (i.e. PCR–RFLPs analysis of the ITS of rDNA). Finally, Bayesian clustering, using allozymes and EF1 α−1 nDNA markers, has demonstrated that hybridization between A. pegreffii and A. simplex (s. s.) is a contemporary phenomenon in sympatric areas, while no introgressive hybridization takes place between the two species

    Phase space structures and ionization dynamics of hydrogen atom in elliptically polarized microwaves

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    The multiphoton ionization of hydrogen atoms in a strong elliptically polarized microwave field exhibits complex features that are not observed for ionization in circular and linear polarized fields. Experimental data reveal high sensitivity of ionization dynamics to the small changes of the field polarization. The multidimensional nature of the problem makes widely used diagnostics of dynamics, such as Poincar\'{e} surfaces of section, impractical. We analyze the phase space dynamics using finite time stability analysis rendered by the fast Lyapunov Indicators technique. The concept of zero--velocity surface is used to initialize the calculations and visualize the dynamics. Our analysis provides stability maps calculated for the initial energy at the maximum and below the saddle of the zero-velocity surface. We estimate qualitatively the dependence of ionization thresholds on the parameters of the applied field, such as polarization and scaled amplitude

    Dermatological high-dose-rate brachytherapy for the treatment of basal and squamous cell carcinoma

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    Basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) are among the most common cancers in humans. Various therapies are currently being used to treat these tumours including surgery, topical treatments and radiotherapy. We describe a new treatment for BCC and SCC. This consists of superficial radiotherapy, using synthetic resin containing a radioactive beta-emitting isotope. The resin is applied to the lesion to perform a selective beta-irradiation brachytherapy treatment

    Estudo reológico de polpa de caju em diferentes concentrações.

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    Neste estudo foi avaliado o comportamento reológico de polpa de caju em diferentes concentrações (5,5 a 25,0°Brix) na temperatura de 30°C. Os resultados indicaram um aumento da viscosidade com o aumento da concentração. A polpa de caju teve o comportamento de um fluido não Newtoniano com características pseudoplásticas. Palavras-chave: Anacardium occidentale L., reologia, viscosidade

    Assessing the risk of an emerging zoonosis of worldwide concern : anisakiasis

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    The authors sincerely thank the Biobanking platform at the PARASITE project (EU FP7 PARASITE project (GA no. 312068)) for providing host-parasite data. We thank Rosa Fernández and Cristina Martínez from CETMAR for their help during creation and divulgation of the questionnaires. We also thank Arturo del Rey Moreno (“Antequera” hospital) for his helpful comments. We are also grateful to “Subdirección General de Economía Pesquera” of “Ministerio de Agricultura, Alimentación y Medio Ambiente” (MAGRAMA) of the Spanish government for providing anchovy trade statistics for 2013. M. Bao is supported by a PhD grant from the University of Aberdeen and also by financial support of the contract from the EU Project PARASITE (grant number 312068).Peer reviewedPublisher PD

    From non-symmetric particle systems to non-linear PDEs on fractals

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    We present new results and challenges in obtaining hydrodynamic limits for non-symmetric (weakly asymmetric) particle systems (exclusion processes on pre-fractal graphs) converging to a non-linear heat equation. We discuss a joint density-current law of large numbers and a corresponding large deviations principle.Comment: v2: 10 pages, 1 figure. To appear in the proceedings for the 2016 conference "Stochastic Partial Differential Equations & Related Fields" in honor of Michael R\"ockner's 60th birthday, Bielefel

    Efeito de banho de ultrassom de baixa frequência sobre a germinação e vigor de sementes de gliricídia (Gliricidia sepium).

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    Objetivou-se avaliar o efeito do uso do ultrassom de baixa frequência sobre a germinação e vigor de sementes de gliricídia (Gliricidia sepium)

    Crescimento inicial de um eucalipto clonado sob diferentes adubações em Porto Velho, Rondônia.

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    O objetivo deste trabalho foi avaliar o crescimento inicial de um clone de eucalipto sob combinações de doses de P2O5 e K2O no plantio e adubação de cobertura em Porto Velho, RO

    Unidade de Referência Tecnológica em iLPF como ferramenta de transferência de tecnologia para recuperação de pastagem degradada em Porto Velho, Rondônia.

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    O sucesso dos sistemas iLPF está relacionado com a escolha de tecnologias apropriadas para as diferentes ecorregiões. A Embrapa e parceiros vêm desenvolvendo tecnologias correlatas ao iLPF que apresentam vantagens técnicas e financeiras em relação àquelas utilizadas pelos agricultores. Em razão da diversidade de sistemas iLPF, é primordial a formação e implementação de uma rede de informações técnico-científicas como principal elemento catalisador e propulsor do processo de inovação. Alguns condicionantes e estratégias são especialmente impactantes à transferência de conhecimentos e tecnologias (TT) nos projetos de iLPF, como é o caso da implementação das Unidades de Referência Tecnológica (URTs). Em 2012, foi implantado uma URT, no campo experimental da Embrapa Rondônia em Porto Velho, com a utilização de lavouras de milho cultivadas em sistema Santa Fé, em consórcio com a braquiária Urochloa ruziziensis e U. brizantha cv Xaraés, em metade da área, com cada forrageira. A área foi subdividida com renques de eucaliptos implantados em consórcio com a lavoura de milho e as forrageiras. A URT em iLPF da Embrapa Rondônia na região amazônica abarca os objetivos de TT ao estabelecer exemplos de funcionamento dos sistemas de produção e das tecnologias mais adequadas às condições locais, favorecendo a adoção de novas técnicas, atitudes e (ou) comportamentos, fato que implica em mudanças na visão dos produtores rurais e sua relação com a produção
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