576 research outputs found
Composição química e valores de energia de subprodutos do beneficiamento de arroz.
bitstream/item/85049/1/DCOT-244.pd
Avaliação da produtividade e componentes produtivos da mamoneira IAC 2028 em espaçamento reduzido no período da safrinha.
Magneto-optic transmittance modulation observed in a hybrid graphene-split ring resonator terahertz metasurface
By placing a material in close vicinity of a resonant optical element, its intrinsic optical response can be tuned, possibly to a wide extent. Here, we show that a graphene monolayer, spaced a few tenths of nanometers from a split ring resonator metasurface, exhibits a magneto-optical response which is strongly influenced by the presence of the metasurface itself. This hybrid system holds promises in view of thin optical modulators, polarization rotators, and nonreciprocal devices, in the technologically relevant terahertz spectral range. Moreover, it could be chosen as the playground for investigating the cavity electrodynamics of Dirac fermions in the quantum regime.The work was supported in part by the European Union Graphene Flagship under grant agreement n° 604391.This is the author accepted manuscript. The final version is available from AIP via http://dx.doi.org/10.1063/1.493170
Efeito da granulometria sobre o conteúdo energético do milho para frangos de corte.
bitstream/item/58543/1/CUsersPiazzonDocuments218.pd
Integrating fungicide and biocontrol foliar spray on maize grain yield and fumonisin content.
The adoption of biocontrol is low in maize production, although it has been reported reduction in fumonisin levels when combined with fungicides. The objective of this work was to evaluate the potential of Streptomyces araujoniae (BC1) and Bacillus sp. (BC2) combined or not with the fungicide azoxystrobin+ciproconazol (FG), on grain yield, Fusarium verticillioides incidence and fumonisin (B1 and B2) content. Maize plants were sprayed two times, at V9 and R1 with Water, BC1, BC2, Fungicide alone or in different combinations two by two. All plants were inoculated with F. verticillioides. Upon harvest, treatments were evaluated for total yield, F. verticillioides grain contamination (blotter test) and total fumonisin (B1+B2) contents. FG (V9) + BC1 (R1) resulted in increased yield in three out of four field trials, while all other treatments increased yield in only two. All treatments except FG (V9 + R1) reduced F. verticillioides incidence. None of the treatments reduced fumonisin levels, but FG (V9 + R1), BC1 (V9) + FG (R1) and BC1 (V9) + BC1 (R1) resulted in higher mycotoxin content compared to the control. FG (V9) + BC1 (R1) increased yield, reduced grain contamination and didn?t contribute to higher fumonisin levels compared to control. Therefore, it can contribute to qualitative and quantitative maize grain yield improvement
Composição nutritiva de ingredientes para rações de aves.
bitstream/item/58402/1/CUsersPiazzonDocuments241.pdfAcesso em: 13 jun 2007
Integration studies of RF solid-state generators in the electrical system of NBTF experiments and ITER HNB
SPIDER operation, started in 2018, pointed out performance-limiting issues
caused by the technology employed in RF generators, based on tetrode
free-running oscillators. One of these limits, namely the onset of frequency
instabilities, prevented operation at the full rated power of 200 kW. In
addition, tetrodes require high voltage to operate, which translates to risk of
flashovers and the necessity to perform conditioning procedures, limiting the
overall reliability. These disadvantages, combined with the positive experience
gained in the meanwhile on smaller facilities with solid state amplifiers, led
to the proposal of a complete re-design of the radiofrequency power supplies.
This paper describes the modelling activities used to define specifications and
design criteria of the solid-state amplifiers for SPIDER and MITICA, which can
be directly transposed to the ITER HNB units when their functionality is
proven. We detail the topology of the generators, consisting of class D
amplifier modules combined to achieve the required 200 kW, which design is
mainly driven by the necessity to deliver nominal power to the ion source,
mitigate the risk of obsolescence, and improve the reliability through
modularity. Due to the non-standard application, we gave particular focus to
the integration of generators in the RF systems of SPIDER and MITICA. Numerical
analyses were performed to verify the impact of harmonic distortion on
transmission line and RF load components, to address the effect of mutual
coupling between RF circuits on the generator output modulation, and to assess
the magnitude of common mode currents in the electric system. These studies, as
well as the experience gained from SPIDER operation, helped to define dedicated
circuit design provisions and control strategies, which are currently being
implemented in the detailed design and construction phase of the new RF
amplifiers
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