Resonant properties, of modified triangular plasmonic nanoparticles with higher field concentration

In this paper, we present an analysis of the resonant response of modified triangular metallic nanoparticles with polynomial sides. The particles are illuminated by an incident plane wave and the method of moments is used to solve numerically the electromagnetic scattering problem. We investigate spectral response and near field distribution in function of the length and polynomial order of the nanoparticles. Our results show that in the analyzed wavelength range (0.5-1.8) µm these particles possess smaller number of resonances and their resonant wavelengths, near field enhancement and field confinement are higher than those of the conventional triangular particle with linear sides.

Transporte eletrônico de nanofita de grafeno sob a influência de constrições e oxidação

Neste trabalho, investigamos os efeitos da funcionalização de grupos oxidativos sobre a estrutura de nanofitas de grafeno zigue-zague e também os efeitos de constrições, onde estes efeitos foram analisados por meio de transporte eletrônico via campo externo longitudinal. Nossos cálculos foram parametrizados pelo modelo semi-empírico de Huckel estendido-ETH, adotando-se o método das funções de Green de não equilíbrio- NEGF. As correntes foram calculadas via equação de Landauer que usa a função de transmissão da região espalhadora ao fluxo de elétrons com energia (E) vinda do eletrodo esquerdo. Por meio dessa abordagem, foi possível analisarmos o comportamento dos portadores de carga em cada um os dispositivos propostos, bem como, a natureza de tal comportamento. Verificaram-se nas curvas I(V) dois regimes de transporte: Ôhmico e NDR, verificando máximos de corrente e, também a tensão de limiar (VTh1-se que o poro ao centro da fita criou duas nanoconstrições nas laterais da fita, permitindo assim o confinamento eletrônico nos dispositivos baseados em nestas fitas, caracterizando-as como um diodo de tunelamento ressonante-DRT verificado pela relação pico/vale 7:1. Podemos concluir que nossa proposta de dispositivo está consoante aos resultados experimentais para nanodispositivos e que suas aplicabilidades não se restringirão diante dos estados de oxidação, sendo um fator positivo e que contribui para os aspectos fenomenológicos de transporte eletrônico em grafeno e para a fabricação de nanodispositivos de baixo custo.

Analysis of modified bowtie nanoantennas in the excitation and emission regimes

In this work, we analyze modified bowtie nanoantennas with polynomial sides in the excitation and emission regimes. In the excitation regime, the antennas are illuminated by an incident plane wave, and in the emission regime, the excitation is fulfilled by infinitesimal electric dipole positioned in the gap of the nanoantennas. Several antennas with different sizes and polynomial order were numerically analyzed by method of moments. The results show that these novel antennas possess a controllable resonance by the polynomial order and good characteristics of near field enhancement and confinement for applications in enhancement of spontaneous emission of a single molecule.

Desempenho reprodutivo e produtivo de ovelhas deslanadas mantidas em regime de pasto e suplementadas

Pós-graduação em Medicina Veterinária - FCAV

Imunocastração no desempenho, características de carcaça e qualidade da carne de bovinos terminados em confinamento

Pós-graduação em Zootecnia - FMVZ

Ectoparasitos de tilápias do Nilo (Oreochromis niloticus) cultivados em sistemas de tanques-rede e da ictiofauna associada à piscicultura na represa de Chavantes, município de Ipaussu, São Paulo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Desempenho e características da carcaça e da carne de cordeiros terminados em confinamento com dietas contendo silgens de resíduos de peixes

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fontes lipídicas na alimentação de ovinos confinados

Pós-graduação em Zootecnia - FCAV

A agropecuária e os aldeamentos indígenas goianos

A decadência da mineração e o início da ruralização da sociedade. A política pombalina e a retomada doe aldeamentos oficiais. A segunda fase dos aldeamenlos: São José de Mossâmedes, Nova Maria I, Carretão, Salinas ou Boa Vista e Estiva. O indígena e o capitalismo comercial em Goiás nos séculos XVIII e XIX.

Características morfológicas dos músculos e qualitativas da carne de cordeiros suplementados e terminados em diferentes índices de área foliar residual

Pós-graduação em Zootecnia - FCAV

Vibração de plantas de pimenta (capsicum sp) para produção de frutos e sementes em ambiente protegido

Pós-graduação em Agronomia (Horticultura) - FCA

Concentração de lactato sérico em ovelhas e cordeiros mestiços (1/2 Suffolk) nascidos em eutocia

The aim of this study was to evaluate the venous blood lactate concentration in sheep and newborn lambs immediately after normal delivery. We used 14 ewes, nine and four Suffolk crossbred lambs and 20 healthy newborns (males and females). The effect of gender, race and number of lambs per birth was investigated, as well as the possible correlation between the concentration of maternal and newborn lactate. There was no difference between males and females or in relation to race (and Suffolk crossbred); however the concentration of lactate was higher in twin or triplet lambs when compared to single lambs. There was a positive correlation between the maternal and newborn concentration and the higher the concentration of lactate, the greater the concentration in the lamb immediately after normal delivery. The results of this study provide a base from which to compare the blood lactate levels in lambs in critical condition.

Rendimentos de carcaça, cortes comerciais e não-componentes da carcaça de cordeiros Santa Inês alimentados com feno de erva-sal e concentrado

This work aimed to evaluate the carcass yields, commercial cuts and non-carcass components of Santa Inês lambs fed with 30, 40, 50 or 60% of oldman saltbush hay with concentrated. Were used 32 castrated lambs at 8 months old and initial body weight of 22 + 1.97kg, housed individually and slaughtered after 60 days of feedlot. The weights of hot and cold carcass decreased linearly with the inclusion of saltbush hay in the diet, however, there was no effect for true carcass yield and commercial cuts: shoulder (19.26%), neck (8.52%) ribs (26.57%) and leg (33.88%). There was a linear decrease for ribeye area and fat thickness when the level of hay in the diet increased. The weights and yields of skin, liver, heart, kidneys with perirenal fat, omental and mesenteric fats decreased linearly with the inclusion of hay in the diet, while the content (%) of gastrointestinal tract increased. The increased proportion of saltbush hay in the diet of lambs provided adequate true carcass yield and commercial cuts, however, reduces the ribeye area and fat thickness, important measurements in the qualitative evaluation of the lamb's carcass.

Nutrient intake, productive performance and body measurements of dairy heifers fed with different sources of protein

This study evaluated the effect of different protein sources (soybean meal, cottonseed meal, peanut meal and sunflower meal) on dry matter and nutrient intake, productive performance and body measurements of dairy heifers, Holstein x Zebu, recreated in confinement. The experiment consisted in a randomized complete block design made up by 6 replications and 4 treatments. The mean values of ingestion of ether extract (EEI, kg day-1) were statistically different (p < 0.05). The neutral detergent fiber intake (NDFI, %BW) also presented differences (p < 0.05), with higher values in the diet containing sunflower meal (1.01% BW) in relation to the diet with soybean meal (0.84% BW). The average daily weight gain using the diet with soybean meal was superior (0.95 kg day-1) to the diet with sunflower meal (0.82 kg day-1), and considering the final body weight, the diet with soybean meal was superior to the other treatments (p < 0.05). The heart girth presented greater association with body weight (0.93). The soybean meal promoted the best productive performance of crossbred Holstein x Zebu heifers fed diets based on sugarcane. However, cottonseed meal, peanut meal and sunflower meal can be possible alternatives to soybean meal.

Carcass and meat traits of lambs fed by-products from the processing of oil seeds

We evaluated the effect of adding by-products from the processing of oil seeds in the diet of lambs on the carcass and meat traits. Twenty-four non-castrated weaned male Santa Inês lambs with approximately 70 days of age and initial average weight of 19.11 ± 2.12 kg were distributed into a completely randomized design. Treatments consisted of diets containing by-products with 70% of concentrate and 30% of tifton hay (Cynodon spp.) and were termed SM: control with soybean meal; SC: formulated with soybean cake; SUC: formulated with sunflower cake and PC: formulated with peanut cake. Diets had no effects on the carcass traits evaluated. There was no significant effect on the mean values of perirenal, omental and mesenteric fats (0.267, 0.552 and 0.470 kg, respectively) and there was no influence on the percentages of moisture, ether extract, crude protein or ash in the loin between experimental diets. Diets containing by-products from the processing of oil seeds did not change fatty acids found in lamb meat. The use of by-products from oil seeds provided similar carcass and meat traits, thus their use can be recommended as eventual protein and energy sources for feedlot lambs.