Superconducting Kondo phase in an orbitally-separated bilayer

The nature of superconductivity in heavy-fermion materials is a subject under intense debate, and controlling this many-body state is central for its eventual understanding. Here, we examine how proximity effects may change this phenomenon, by investigating the effects of an additional metallic layer on the top of a Kondo-lattice, and allowing for pairing in the former. We analyze a bilayer Kondo Lattice Model with an on-site Hubbard interaction, $-U$, on the additional layer, using a mean-field approach. For $U=0$, we notice a drastic change in the density-of-states due to multiple-orbital singlet resonating combinations. It destroys the well-known Kondo insulator at half filling, leading to a metallic ground state, which, in turn, enhances antiferromagnetism through the polarization of the conduction electrons. For $U\neq 0$, a superconducting Kondo state sets in at zero temperature, with the occurrence of unconventional pairing amplitudes involving $f$-electrons. We establish that this remarkable feature is only possible due to the proximity effects of the additional layer. At finite temperatures we find that the critical superconducting temperature, $T_c$, decreases with the interlayer hybridization. We have also established that a zero temperature superconducting amplitude tracks $T_c$, which reminisces the BCS proportionality between the superconducting gap and $T_c$.Comment: 11 pages, 10 figure

Models for project management in 2016 Olympic Games

The Olympic Games are the major sports event on the planet gathering people for all over the world and integrating several kind of resources that need to be managed in order to achieve efficiency and the sustainability of the event. The research question of this paper is “Which project management business model best fit a mega event like the 2016 Olympic Games?” The organizations which participate in the Olympic Games project management in Rio are under the pressure of external scenarios of uncertainty and also intense competition and internally the organizations that manage all the Olympic resources need to deal with limitations of costs and time – the business model adopted can help to achieve a major success of the event. According to studies made on the past Olympics Project Managers face various challenges and the models adopted can made an integration of various and disperse project management tools. The main finding of this research is that project management maturity models benefits management approaches and reinforce the definition and the use of strategic plans enhancing the control techniques of project management and also the sustainability model is necessary to orchestrate the successful completion of a project with the amplitude of Olympic Games.info:eu-repo/semantics/publishedVersio

Análise sensorial de carne de caprinos do nordeste brasileiro.

Analise sensorial de carne de caprinos do nordeste brasileiro.bitstream/CNPAT-2010/5393/1/Pa-060.pd

Mining noise affects loud call structures and emission patterns of wild black-fronted titi monkeys

Anthropogenic noise pollution is increasing and can constrain acoustic communication in animals. Our aim was to investigate if the acoustic parameters of loud calls and their diurnal pattern in the black-fronted titi monkey (Callicebus nigrifrons) are affected by noise produced by mining activity in a fragment of Atlantic Forest in Brazil. We installed two passive acoustic monitoring devices to record sound 24 h/day, 7 days every 2 months, for a year; one unit was close to an opencast mine and the other 2.5 km away from it. Both sites presented similar habitat structures and were inhabited by groups of black-fronted titi monkeys. We quantified the noise at both sites by measuring the equivalent continuous sound level every 2 months for 1 year and quantified the emission of loud calls by titi monkeys through visual inspection of the recordings. The close site presented higher ambient noise levels than the far site. The quantitative comparison of loud calls of black-fronted titi monkeys between the two sites showed less calling activity in the site close to the mine than in the site further away. Approximately 20 % of the calls detected at the site close to the mine were masked by noise from truck traffic. Loud calls were longer at the site far from the mine and the diurnal patterns of vocal activity differed in the amount of calling as well as in the timing of peak calling activity between the two sites. Our results indicate that mining noise may constrain titi monkeys’ long-distance vocal communication. Loud calls occupy a similar frequency band to mining noise, and an increase in ambient noise may be triggering black-fronted titi monkeys to adjust their long-distance communication patterns to avoid masking of their calls. Given that vocalizations are an important means of social interaction in this species, there are concerns about the impact of mining noise on populations exposed to this human activity

Prediction of geomechanical parameters using a KBS system. Application to two case studies of underground structures

In this paper the knowledge based system called GEOPAT is presented. The system calculates geomechanical parameters for modelling underground structures in rock, soil and heterogeneous formations. Specialists knowledge in this field was congregated and organized in causal nets. GEOPAT is still under developmentand aims to be an important tool for decision support. Nevertheless GEOPAT was already applied to some underground structures with success. In this work two of these applications are presented. The first is a largeunderground station of Metro of Porto and the last is the powerhouse complex composed by two caverns ofthe Venda Nova II hydroelectric scheme. Both structures were built in a granite rock mass. The geomechani-cal parameters were obtained using GEOPAT based on some information gathered in the field. Numerical models were developed and the results were compared with the monitored values. They showed in general a good agreement however it is still necessary to improve and increase the knowledge inside the system

Modelação numérica de uma central hidroeléctrica subterrânea utilizando parâmetros geomecânicos obtidos através de técnicas de inteligência artificial

No Norte de Portugal está a ser construído um grande complexo hidroeléctrico subterrâneo como reforço de potência de um sistema hidroeléctrico existente desde 1951. Este novo complexo inclui um circuito hidráulico com 4,4 km de comprimento e duas cavernas para o conjunto da central. Os parâmetros geomecânicos das formações graníticas interessadas foram obtidos através de um programa chamado GEOPAT, que utiliza técnicas de inteligência artificial. Permite calcular parâmetros geomecânicos para a modelação do comportamento estrutural das obras subterrâneas. Foram desenvolvidos modelos numéricos para a análise do comportamento das cavernas do complexo da central utilizando parâmetros obtidos pelo GEOPAT. Os valores calculados a partir dos modelos numéricos foram comparados com os correspondentes valores observados apresentando na globalidade uma boa concordância

Infestação de taperebá (Spondias mombin L.) por moscas-das-frutas (Diptera: Tephritidae) e seus parasitoides (Hymenoptera: Braconidae) no estado do Amapá.

O taperebá (Spondias mombin L., Anacardiaceae) é uma fruta típica das regiões Norte e Nordeste do Brasil. É muito apreciada para o consumo in natura ou na forma processada, como sucos, sorvetes e doces. Em geral, apresenta elevados índices de infestação por moscas-das-frutas e tem sido apontada como potencial repositório de parasitoides. Esse trabalho teve como objetivo identificar as espécies de Anastrepha e parasitoides associados que ocorrem em taperebá no estado do Amapá. No período de abril a novembro de 2009, foram coletadas 13 amostras (195 frutos) de taperebá: Ferreira Gomes (3 amostras, 45 frutos, 0,82 kg), Macapá (3 amostras, 45 frutos, 0,43 kg), Mazagão (2 amostras, 30 frutos, 0,41 kg), Porto Grande (3 amostras, 45 frutos, 0,38 kg) e Santana (2 amostras, 30 frutos, 0,21 kg). Cada amostra foi composta por 15 frutos, cada qual representando uma subamostra. Os frutos foram dispostos, individualmente, em potes de plástico transparente contendo uma camada de vermiculita e cobertos com tecido organza. Do total de frutos coletados, 73 apresentaram infestação por Anastrepha (37,4% dos frutos infestados). Foram obtidos 157 pupários, caracterizando índices de infestação variáveis, sendo o menor índice obtido nos frutos coletados em Macapá (11,6 pupários/kg) e o maior em Santana (219,0 pupários/kg). Houve registro de Anastrepha obliqua em 31 frutos (42,5% dos frutos infestados); Anastrepha antunesi (4 frutos; 5,5%); Anastrepha striata (2 frutos; 2,7%) e Anastrepha fraterculus (1 fruto; 1,4%). Em apenas um fruto, coletado em Porto Grande, foi observado compartilhamento de recurso entre A. antunesi e A. obliqua. Foram obtidos os parasitoides Doryctobracon areolatus (Szépligeti) e Opius bellus (Gahan) (10 e 11 espécimes, respectivamente), caracterizando parasitismo de 13,4%. Em um mesmo fruto foi registrado a emergência de D. areolatus, O. bellus e A. obliqua. O taperebá parece exercer importante papel na manutenção das populações de parasitoides de Anastrepha.Resumo 1837