1,756 research outputs found
El síndrome mielodisplásico como nueva expresión hematológica paraneoplásica de carcinomas sólidos. A propósito de 22 casos
3D-printed devices for continuous-flow organic chemistry
We present a study in which the versatility of 3D-printing is combined with the processing advantages of flow chemistry for the synthesis of organic compounds. Robust and inexpensive 3D-printed reactionware devices are easily connected using standard fittings resulting in complex, custom-made flow systems, including multiple reactors in a series with in-line, real-time analysis using an ATR-IR flow cell. As a proof of concept, we utilized two types of organic reactions, imine syntheses and imine reductions, to show how different reactor configurations and substrates give different products
Spin-Exchange Interaction in ZnO-based Quantum Wells
Wurtzitic ZnO/(Zn,Mg)O quantum wells grown along the (0001) direction permit
unprecedented tunability of the short-range spin exchange interaction. In the
context of large exciton binding energies and electron-hole exchange
interaction in ZnO, this tunability results from the competition between
quantum confinement and giant quantum confined Stark effect. By using
time-resolved photoluminescence we identify, for well widths under 3 nm, the
redistribution of oscillator strengths between the A and B excitonic
transitions, due to the enhancement of the exchange interaction. Conversely,
for wider wells, the redistribution is cancelled by the dominant effect of
internal electric fields, which dramatically reduce the exchange energy.Comment: 14 pages, 3 figure
Seleção de épocas de plantio para minimizar o efeito de veranico para a cultura do milho: nota preliminar.
Análise de interação de data de plantio, probabilidade de chuvas e consumo de água pela cultura do milho: nota preliminar.
Graus-dia estimado com diferentes valores de temperatura base na cultura do milho (Zea mays L.).
Estimativa do período de florescimento e maturidade fisiólogica da cultura do sorgo por meio de graus-dias, calculado com diferentes valores de temperatura base.
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