1,002 research outputs found
Identifying barriers and opportunities for transitions towards more sustainable agriculture through system analysis: the case of Vereda La Hoya, Colombia
The paper presents the results of studies which investigated farmersā reasoning and behaviour with
regards to the misāuse of personal protective equipment and pesticide among smallholders in Colombia. First,
the research approach is described. In particular, the structured mental models approach and the integrative
agentācentred framework are presented. These approaches permit to understand the farmersā reasoning and
behaviour in a system perspective. Second, the results are summarized. The methods adopted allowed not only
for identifying the factors, but also the social dynamics influencing farmers. Finally, suggestions for
interventions are provided, which are not limited to a technical fix, but address the underlying social causes of
the problem
Positive Correlations in Tunneling through coupled Quantum Dots
Due to the Fermi-Dirac statistics of electrons the temporal correlations of
tunneling events in a double barrier setup are typically negative. Here, we
investigate the shot noise behavior of a system of two capacitively coupled
quantum dot states by means of a Master equation model. In an asymmetric setup
positive correlations in the tunneling current can arise due to the bunching of
tunneling events. The underlying mechanism will be discussed in detail in terms
of the current-current correlation function and the frequency-dependent Fano
factor.Comment: HCIS 13 in Moden
Time-delayed feedback in neurosystems
The influence of time delay in systems of two coupled excitable neurons is
studied in the framework of the FitzHugh-Nagumo model. Time-delay can occur in
the coupling between neurons or in a self-feedback loop. The stochastic
synchronization of instantaneously coupled neurons under the influence of white
noise can be deliberately controlled by local time-delayed feedback. By
appropriate choice of the delay time synchronization can be either enhanced or
suppressed. In delay-coupled neurons, antiphase oscillations can be induced for
sufficiently large delay and coupling strength. The additional application of
time-delayed self-feedback leads to complex scenarios of synchronized in-phase
or antiphase oscillations, bursting patterns, or amplitude death.Comment: 13 pages, 13 figure
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