698 research outputs found
Optimal diffusion in ecological dynamics with Allee effect in a metapopulation
How diffusion impacts on ecological dynamics under the Allee effect and
spatial constraints? That is the question we address. Employing a microscopic
minimal model in a metapopulation (without imposing nonlinear birth and death
rates) we evince --- both numerically and analitically --- the emergence of an
optimal diffusion that maximises the survival probability. Even though, at
first such result seems counter-intuitive, it has empirical support from recent
experiments with engineered bacteria. Moreover, we show that this optimal
diffusion disappears for loose spatial constraints.Comment: 16 pages; 6 figure
Comparación de la medición del espesor de la capa de fibras nerviosas de la retina con dos protocolos del SD-OCT Heidelberg
[Extracto] Justificación y objetivos - La medición del espesor de la capa de fibras nerviosas
(CFN) del antiguo protocolo consiste en un
escaneado circular de diámetro fijo que se coloca
sobre el nervio óptico para medir las fibras nerviosas
peripapilares. [...]info:eu-repo/semantics/publishedVersio
Performance clínica de la autorrefraction Visionix L67
info:eu-repo/semantics/publishedVersio
Thermoelectrical regulation of microinjection moulds
Microinjection is one of the major replication
techniques for producing low cost micro parts.
The small scale of the microinjection
processes presents different challenges from
those usually encountered in conventional injection
moulding. One particular aspect, very important for
part quality, is mould temperature control.
In conventional injection moulding, the
temperature control system is set to a fixed value
during the injection cycle. In microinjection
moulding such behaviour is not acceptable, which
as lead to the development of “active” control
temperature of the mould named “variotherm”
systems.
In the present paper a study will be presented
for the implementation of thermo electric elements
in dynamic temperature control of microinjection
moulds and its impact on the process cycle time
and part quality
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