Comment on "Fano Resonance for Anderson Impurity Systems"

In a recent Letter, Luo et al. (Phys. Rev. Lett. 92, 256602 (2004)) analyze the Fano line shapes obtained from scanning tunneling spectroscopy (STS) of transition metal impurities on a simple metal surface, in particular of the Ti/Au(111) and Ti/Ag(100) systems. As the key point of their analysis, they claim that there is not only a Fano interference effect between the impurity d-orbital and the conduction electron continuum, as derived in Ujsaghy et al. (Phys. Rev. Lett. 85, 2557 (2000)), but that the Kondo resonance in the d-electron spectral density has by itself a second Fano line shape, leading to the experimentally observed spectra. In the present note we point out that this analysis is conceptually incorrect. Therefore, the quantitative agreement of the fitted theoretical spectra with the experimental results is meaningless.Comment: 1 page, no figures. Accepted for publication in PRL; revised version uploaded on November 18th, 200

Status of neutrino oscillations 2018: first hint for normal mass ordering and improved CP sensitivity

We present a new global fit of neutrino oscillation parameters within the simplest three-neutrino picture, including new data which appeared since our previous analysis~\cite{Forero:2014bxa}. In this update we include new long-baseline neutrino data involving the antineutrino channel in T2K, as well as new data in the neutrino channel, data from NO$\nu$A, as well as new reactor data, such as the Daya Bay 1230 days electron antineutrino disappearance spectrum data and the 1500 live days prompt spectrum from RENO, as well as new Double Chooz data. We also include atmospheric neutrino data from the IceCube DeepCore and ANTARES neutrino telescopes and from Super-Kamiokande. Finally, we also update our solar oscillation analysis by including the 2055-day day/night spectrum from the fourth phase of the Super-Kamiokande experiment. With the new data we find a preference for the atmospheric angle in the upper octant for both neutrino mass orderings, with maximal mixing allowed at $\Delta\chi^2 = 1.6 \, (3.2)$ for normal (inverted) ordering. We also obtain a strong preference for values of the CP phase $\delta$ in the range $[\pi,2\pi]$, excluding values close to $\pi/2$ at more than 4$\sigma$. More remarkably, our global analysis shows for the first time hints in favour of the normal mass ordering over the inverted one at more than 3$\sigma$. We discuss in detail the origin of the mass ordering, CP violation and octant sensitivities, analyzing the interplay among the different neutrino data samples.Comment: Updated neutrino oscillation analysis using the most recent results from T2K, NO$\nu$A, RENO and Super-Kamiokande. 17 pages, 8 figures, 1 tabl

Sterile neutrinos with altered dispersion relations revisited

In this paper we investigate neutrino oscillations with altered dispersion relations in the presence of sterile neutrinos. Modified dispersion relations represent an agnostic way to parameterize new physics. Models of this type have been suggested to explain global neutrino oscillation data, including deviations from the standard three-neutrino paradigm as observed by a few experiments. We show that, unfortunately, in this type of models new tensions arise turning them incompatible with global data.Comment: 22 pages, 7 figures, 2 tables. Version 2, matches published versio

Caracterização de parâmetros determinantes na modelagem da transmissão de enfezamentos em milho.

Com o crescimento do plantio de milho no Brasil, aumentou também o interesse em amenizar os danos causados pelas doenças de milho conhecidas como enfezamentos pálido e vermelho, transmitidas pela cigarrinha Dalbulus maidis. Este trabalho apresenta um modelo matemático determinístico para analisar a incidência do enfezamento pálido e a dinâmica populacional da cigarrinha D. maidis nos períodos de safra. Para tal, o modelo proposto por Silva et al. (2011) foi estendido, considerando a aquisição da doença pelo vetor antes da fase adulta. A partir do estudo analítico do sistema de equações que representa a dinâmica do patossistema foram obtidos os pontos de equilíbrio do modelo e analisada a estabilidade do sistema. Simulações numéricas foram realizadas utilizando valores dos parâmetros a partir da literatura.CIIC 2012. No 12603

Towards a spatial decision support system for animal traceability.

This section presents the contributions of our work to the problems of bovine traceability and contact between animals using trajectory database concepts. This section describes how to delimitate problems and how to represent animal movements as trajectories. Afterwards, the algorithms for the identification of contacts between animals are presented for the calculation of contamination probabilities. In this work we define contamination algorithms for foot-and-mouth disease (FMD). FMD is a highly contagious disease that attacks all cleft-hoofed animals, mainly bovines. It occurs at all ages, regardless of sex, breed, climate, etc. The virus spreads by direct contact of animals as well as through the air, water and food.Contrato nº 43134

Software livre para a agropecuára.

Software Livre [Free Software) é uma categoria de software onde o código fonte encontra-se disponível para qualquer pessoa estudá-lo, copiá-lo, modificá-lo e distribuí-lo seja na sua forma original ou com modificações, gratuitamente ou com custo. A garantia dessas liberdades é dada por meio de licenças, como por exemplo, a General Public License - GPL. O governo federal externou em várias oportunidades que incentiva a adoção e a produção de software livre como um novo paradigma que possibilita o crescimento e fortalecimento da indústria, gerando emprego e renda. Nesse sentido vem tratando a questão como política pública e instituiu, em 2003, oito comitês técnicos com o objetivo de coordenar e articular o planejamento e a implementação de software livre, inclusão digital e integração de sistemas, dentre outras questões relacionadas. A transferência de conhecimentos e tecnologias cm beneficio da sociedade, incluindo as tecnologias de informação e comunicação que possam viabilizar soluções para o desenvolvimento sustentável da produção e da pesquisa agropecuária, é uma das missões da Embrapa. Dessa forma, a empresa está atenta à determinação do governo federal para uso de software livre. O conhecimento do domínio agropecuário e a capacidade técnica dos profissionais de informática da empresa são alguns atributos que viabilizaram a implantação da Rede de Software Livre para Agropecuária - Rede AgroLivre. A Rede AgroLivre objetiva a adoção do software livre e da certificação digital na Embrapa, e o aumento da oferta de sofware livre para uso no setor agropecuário. Dentre as ações programadas, em março de 2004 foi criado o repositório de software livre onde foram compartilhados alguns softwares desenvolvidos pela Embrapa. Gradativamente novos softwares da própria Embrapa e de instituições parceiras serão incorporados ao projeto. O repositório é também uma infra-estrutura adequada para o desenvolvimento de software de forma compartilhada e distribuída, permitindo que outras iniciativas do setor privado possam utilizar-se desta tecnologia para o desenvolvimento de seus projetos. Deve-se destacar outras ações em andamento no âmbito da Rede AgroLivre, tais como, o desenvolvimento de componentes livres para a pecuária de corte e de leite e a incubação de empresas de software, visando a continuidade dos produtos compartilhados no repositório e a sustentabilidade do modelo de negócios em software livre, do ponto de vista das empresas nacionais privadas que atuam na área de tecnologia da informação. O atual modelo de negócios no mercado de software, baseado em venda de licenças, está em discussão com o avanço do uso de software livre. Serviços de consultoria, capacitação e personalização de produtos de software são potencializados, provocando alterações no modelo vigente, tornando-o socialmente mais justo, pois garante a principal premissa para a criação e inovação: acesso sem fronteira ao conhecimento. O software livre coloca-se definitivamente como uma opção socialmente justa - possibilidade irrestrita de acesso à tecnologia por toda a sociedade - , economicamente viável - economia de recursos com o pagamento de royalties e modelo de negócios voltado a serviços -, e tecnologicamente sustentável - alta qualidade e suporte às tecnologias livres existentes.Editado por Augusto Guilherme de Araujo e Marcelo Giovanetti Canteri. Evento conhecido como SBI-AGRO

Strong paramagnon scattering in single atom Pd contacts

Among all transition metals, palladium (Pd) has the highest density of states at the Fermi energy at low temperatures yet does not fulfill the Stoner criterion for ferromagnetism. However, its close vicinity to magnetism renders it a nearly ferromagnetic metal, which hosts paramagnons, strongly damped spin fluctuations. Here we compare the total and the differential conductance of mono-atomic contacts consisting of single Pd and Cobalt (Co) atoms between Pd electrodes. Transport measurements reveal a conductance for Co of 1\,G0, while for Pd we obtain 2\,G0. The differential conductance of mono-atomic Pd contacts shows a drop with increasing bias, which gives rise to a peculiar \Lambda-shaped spectrum. Supported by theoretical calculations we correlate this finding with the lifetime of hot quasi-particles in Pd which is strongly influenced by paramagnon scattering. In contrast to this, Co adatoms locally induce magnetic order and transport through single cobalt atoms remains unaffected by paramagnon scattering, consistent with theory.PostprintPeer reviewe

Fate of conjugated natural and synthetic steroid estrogens in crude sewage and activated sludge batch studies

This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in Environmental Science & Technology, copyright © American Chemical Society after peer review. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/es801952h.Steroids are excreted from the human body in the conjugated form but are present in sewage influent and effluent as the free steroid, the major source of estrogenic activity observed in water courses. The fate of sulfate and glucuronide conjugated steroid estrogens was investigated in batch studies using activated sludge grown on synthetic sewage in a laboratory-scale Husmann simulation and crude sewage from the field. A clear distinction between the fate of sulfate and glucuronide conjugates was observed in both matrices, with sulfated conjugates proving more recalcitrant and glucuronide deconjugation preferential in crude sewage. For each conjugate, the free steroid was observed in the biotic samples. The degree of free steroid formation was dependent on the conjugate moiety, favoring the glucuronide. Subsequent degradation of the free steroid (and sorption to the activated sludge solid phase) was evaluated. Deconjugation followed the first order reaction rate with rate constants for 17α-ethinylestradiol 3-glucuronide, estriol 16α-glucuronide, and estrone 3-glucuronide determined as 0.32, 0.24, and 0.35 h respectively. The activated sludge solid retention time over the range of 3−9 days had 74 to 94% of sulfate conjugates remaining after 8 h. In contrast, a correlation between increasing temperature and decreasing 17α-ethinylestradiol 3-glucuronide concentrations in the activated sludge observed no conjugate present in the AS following 8 h at 22 °C Based on these batch studies and literature excretion profiles, a hypothesis is presented on which steroids and what form (glucuronide, sulfate, or free) will likely enter the sewage treatment plant.EPSR

Influence of operating parameters on the biodegradation of steroid estrogens and nonylphenolic compounds during biological wastewater treatment processes

This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in Environmental Science & Technology, copyright © American Chemical Society after peer review. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/es901612v.This study investigated operational factors influencing the removal of steroid estrogens and nonylphenolic compounds in two sewage treatment works, one a nitrifying/denitrifying activated sludge plant and the other a nitrifying/denitrifying activated sludge plant with phosphorus removal. Removal efficiencies of >90% for steroid estrogens and for longer chain nonylphenol ethoxylates (NP4−12EO) were observed at both works, which had equal sludge ages of 13 days. However, the biological activity in terms of milligrams of estrogen removed per day per tonne of biomass was found to be 50−60% more efficient in the nitrifying/denitrifying activated sludge works compared to the works which additionally incorporated phosphorus removal. A temperature reduction of 6 °C had no impact on the removal of free estrogens, but removal of the conjugated estrone-3-sulfate was reduced by 20%. The apparent biomass sorption (LogKp) values were greater in the nitrifying/denitrifying works than those in the nitrifying/denitrifying works with phosphorus removal for both steroid estrogens and nonylphenolic compounds possibly indicating a different cell surface structure and therefore microbial population. The difference in biological activity (mg tonne−1 d−1) identified in this study, of up to seven times, suggests that there is the potential for enhancing the removal of estrogens and nonylphenols if more detailed knowledge of the factors responsible for these differences can be identified and maximized, thus potentially improving the quality of receiving waters.Public Utilities Board (Singapore), Anglian Water Ltd, Severn Trent Water Ltd, Thames Water Utilities Ltd, United Utilities 393 Plc and Yorkshire Water Services

Uma proposta de sistema de informação baseado em software livre para a produção integrada da carne bovina.

O Sistema Agropecuário de Produção Integrada de Carne Bovina (SAPI Bov) visa a obtenção de carne de alta qualidade, considerando os preceitos relativos à sustentabilidade ambiental, segurança alimentar, saúde humana e responsabilidade social. O sistema de informação e-SAPI Bov objetiva informatizar os processos preconizados no modelo de produção integrada para contribuir na tomada de decisão para a correção de possíveis falhas em tempo hábil, além de permitir a rastreabilidade do produto final. As características e estrutura básica consideradas no desenvolvimento do e-SAPI Bov são apresentadas aqui.Editado por Augusto Guilherme de Araujo e Marcelo Giovanetti Canteri. Evento conhecido como SBI-AGRO