1,561 research outputs found
Quantum effective force in an expanding infinite square-well potential and Bohmian perspective
The Schr\"{o}dinger equation is solved for the case of a particle confined to
a small region of a box with infinite walls. If walls of the well are moved,
then, due to an effective quantum nonlocal interaction with the boundary, even
though the particle is nowhere near the walls, it will be affected. It is shown
that this force apart from a minus sign is equal to the expectation value of
the gradient of the quantum potential for vanishing at the walls boundary
condition. Variation of this force with time is studied. A selection of Bohmian
trajectories of the confined particle is also computed.Comment: 7 figures, Accepted by Physica Script
Emissão de N2O e CH4 em diferentes nÃveis de palhada remanescente na cultura de cana-de-açúcar na região de Dourados, MS.
Uso de técnicas de sensoriamento remoto aplicadas à estimativa da produção florestal.
EVINCI. Resumo 053
Classificação de imagens RapidEye baseada em objetos e análise da ecologia de paisagens como suporte ao componente geoespacial do Inventário Florestal Nacional.
Resumo
First in-beam studies of a Resistive-Plate WELL gaseous multiplier
We present the results of the first in-beam studies of a medium size
(1010 cm) Resistive-Plate WELL (RPWELL): a single-sided THGEM
coupled to a pad anode through a resistive layer of high bulk resistivity
(10cm). The 6.2~mm thick (excluding readout electronics)
single-stage detector was studied with 150~GeV muons and pions. Signals were
recorded from 11 cm square copper pads with APV25-SRS readout
electronics. The single-element detector was operated in Ne\(5%
) at a gas gain of a few times 10, reaching 99
detection efficiency at average pad multiplicity of 1.2. Operation at
particle fluxes up to 10 Hz/cm resulted in 23 gain drop
leading to 5 efficiency loss. The striking feature was the
discharge-free operation, also in intense pion beams. These results pave the
way towards robust, efficient large-scale detectors for applications requiring
economic solutions at moderate spatial and energy resolutions.Comment: Accepted by JINS
Indução de mutação em genótipos de arroz submetidos a estresse por baixas temperaturas no estádio germinativo.
CIC UFPelotas
Quantum Dynamics in a Time-dependent Hard-Wall Spherical Trap
Exact solution of the Schr\"{o}dinger equation is given for a particle inside
a hard sphere whose wall is moving with a constant velocity. Numerical
computations are presented for both contracting and expanding spheres. The
propagator is constructed and compared with the propagator of a particle in an
infinite square well with one wall in uniform motion.Comment: 6 pages, 4 figures, Accepted by Europhys. Let
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