7,142 research outputs found
Turning catalytically active pores into active pumps
We develop a semi-analytical model of self-diffusioosmotic transport in
active pores, which includes advective transport and the inverse chemical
reaction which consumes solute. In previous work (Phys. Rev. Lett. 129, 188003,
2022), we have demonstrated the existence of a spontaneous symmetry breaking in
fore-aft symmetric pores that enables them to function as a micropump. We now
show that this pumping transition is controlled by three timescales. Two
timescales characterize advective and diffusive transport. The third timescale
corresponds to how long a solute molecule resides in the pore before being
consumed. Introducing asymmetry to the pore (either via the shape or the
catalytic coating) reveals a second type of advection-enabled transitions. In
asymmetric pores, the flow rate exhibits discontinuous jumps and hysteresis
loops upon tuning the parameters that control the asymmetry. This work
demonstrates the interconnected roles of shape and catalytic patterning in the
dynamics of active pores, and shows how to design a pump for optimum
performance
Efeito da restrição hdrico sobre a germinação de Mimosa verrucosa Benth. (Leguminosae - Mimosaceae).
Suplemento. Edição dos Resumos do XIII Congresso Brasileiro de Fisiologia Vegetal; XIV Reunião Latino-Americana de Fisiologia Vegetal, Búzios, set. 2011
Astragaline levels in creole and breeding lines of common bean from Rio Grande do Sul State, Brazil.
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Previous issue date: 2013-03-28201
O conhecimento tradicional em sementes crioulas: uma experiência vivenciada na terra indÃgena Guarita.
Resumos do VIII Congresso Brasileiro de Agroecologia - Porto Alegre/RS - 25 a 28/11/2013
Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8
Sub-Kelvin scanning tunnelling spectroscopy in the Chevrel Phases SnMo6S8 and
PbMo6S8 reveals two distinct superconducting gaps with Delta_1 = 3 meV, Delta_2
~ 1.0 meV and Delta_1 = 3.1 meV, Delta_2 ~ 1.4 meV respectively. The gap
distribution is strongly anisotropic, with Delta_2 predominantly seen when
scanning across unit-cell steps on the (001) sample surface. The spectra are
well-fitted by an anisotropic two-band BCS s-wave gap function. Our
spectroscopic data are confirmed by electronic heat capacity measurements which
also provide evidence for a twin-gap scenario.Comment: 5 pages, 4 figure
Gerador de relatórios Purus.
Arquitetura do Purus. Arquivo de definição de dados (DataSource). Arquivo de definição de relatório. Recursos. Agrupamento. Funções do grupo. Parametrização de definição de relatório. Inclusão de caracteres ASCII. Formatação de dados. Relatórios no formato CSV. Execução do Purus. Reportmanager.bitstream/CNPTIA/9889/1/comuntec30.pdfAcesso em: 30 maio 2008
Dynamics of defect formation
A dynamic symmetry-breaking transition with noise and inertia is analyzed.
Exact solution of the linearized equation that describes the critical region
allows precise calculation (exponent and prefactor) of the number of defects
produced as a function of the rate of increase of the critical parameter. The
procedure is valid in both the overdamped and underdamped limits. In one space
dimension, we perform quantitative comparison with numerical simulations of the
nonlinear nonautonomous stochastic partial differential equation and report on
signatures of underdamped dynamics.Comment: 4 pages, LaTeX, 4 figures. Submitted to Physical Revie
Avaliações da subtração dos elementos N, P e K sobre a produção e qualidade de frutos de amoreira-preta.
bitstream/item/61569/1/Comunicado-275.pd
Influência da adubação foliar a base de água de xisto na produção e crescimento de cultivares de morangueiro camarosa e camino real.
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