4,999 research outputs found
Desenvolvimento e otimização de metodologias de análise de alimentos por cromatografia líquida de alta eficiência.
Utilização de Melão-de-São-Caetano (Mormodica charantia L.) para preparo de padrões analíticos de zeaxantina.
Quantum Multibaker Maps: Extreme Quantum Regime
We introduce a family of models for quantum mechanical, one-dimensional
random walks, called quantum multibaker maps (QMB). These are Weyl
quantizations of the classical multibaker models previously considered by
Gaspard, Tasaki and others. Depending on the properties of the phases
parametrizing the quantization, we consider only two classes of the QMB maps:
uniform and random. Uniform QMB maps are characterized by phases which are the
same in every unit cell of the multibaker chain. Random QMB maps have phases
that vary randomly from unit cell to unit cell. The eigenstates in the former
case are extended while in the latter they are localized. In the uniform case
and for large , analytic solutions can be obtained for the time
dependent quantum states for periodic chains and for open chains with absorbing
boundary conditions. Steady state solutions and the properties of the
relaxation to a steady state for a uniform QMB chain in contact with
``particle'' reservoirs can also be described analytically. The analytical
results are consistent with, and confirmed by, results obtained from numerical
methods. We report here results for the deep quantum regime (large ) of
the uniform QMB, as well as some results for the random QMB. We leave the
moderate and small results as well as further consideration of the
other versions of the QMB for further publications.Comment: 17 pages, referee's and editor's comments addresse
Obtenção de luteína, violaxantina e B-caroteno a partir de espinafre (Spinacea oleracea LINNEU).
Estudo da qualidade nutricional de jaca (Artocarpus heterophyllus, Lam.) in natura e desidratada sob diferentes condições de secagem.
Atributos do solo impactados por cultivos sucessivos de arroz de terras altas.
O objetivo deste trabalho foi determinar, utilizando esse tipo de análise, quais atributos de um Latossolo Vermelho de Cerrado são mais impactados por cultivos sucessivos de arroz de terras altas sob semeadura direta
Comparação entre colunas cromatográficas de diferentes tamanhos e tipos de partícula na análise de aflatoxinas em amendoim.
bitstream/item/74496/1/pub-195.pd
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