2,238 research outputs found
Land quality monitoring systems that integrate local and technical knowledge contribute to sustainability valuation in agricultural landscapes.
Analog simulator of integro-differential equations with classical memristors
An analog computer makes use of continuously changeable quantities of a
system, such as its electrical, mechanical, or hydraulic properties, to solve a
given problem. While these devices are usually computationally more powerful
than their digital counterparts, they suffer from analog noise which does not
allow for error control. We will focus on analog computers based on active
electrical networks comprised of resistors, capacitors, and operational
amplifiers which are capable of simulating any linear ordinary differential
equation. However, the class of nonlinear dynamics they can solve is limited.
In this work, by adding memristors to the electrical network, we show that the
analog computer can simulate a large variety of linear and nonlinear
integro-differential equations by carefully choosing the conductance and the
dynamics of the memristor state variable. To the best of our knowledge, this is
the first time that circuits based on memristors are proposed for simulations.
We study the performance of these analog computers by simulating
integro-differential models related to fluid dynamics, nonlinear Volterra
equations for population growth, and quantum models describing non-Markovian
memory effects, among others. Finally, we perform stability tests by
considering imperfect analog components, obtaining robust solutions with up to
relative error for relevant timescales
Land quality monitoring systems that integrate local and technical knowledge facilitate adaptation to global change in agricultural landscapes.
IHDP Open Meeting 2009
An Integrated Power Flow Solution of Flexible AC Transmission Systems Containing Wind Energy Conversion Systems
Quantum mechanical description of Stern-Gerlach experiments
The motion of neutral particles with magnetic moments in an inhomogeneous
magnetic field is described in a quantum mechanical framework. The validity of
the semi-classical approximations which are generally used to describe these
phenomena is discussed. Approximate expressions for the evolution operator are
derived and compared to the exact calculations. Focusing and spin-flip
phenomena are predicted. The reliability of Stern-Gerlach experiments to
measure spin projections is assessed in this framework.Comment: 12 pages, 7 eps figures included, revtex, submitted to PR
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