Aperiodic Interactions
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Efeitos de desordem ou aperiodicidade sobre o comportamento de sistemas magnéticos / Effects of disorder or aperiodicity on the behavior of magnetic systems
Consideramos os efeitos de desordem ou aperiodicidade sobre três sistemas magnéticos distintos. Inicialmente, apresentamos um modelo fenomenológico para descrever a dependência térmica da magnetização remanente induzida por diluição numa classe de antiferromagnetos quase-unidimensionais. O modelo trata exatamente as correlações ao longo da direç�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/10/2002
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2. Rigorous results for aperiodic and almost periodic substitution sequences
Recent studies of the effects of geometric fluctuations, associated with aperiodic exchange inter-actions, on the critical behavior of ferromagnetic Ising models on hierarchical lattices, were the motivation to investigate some properties of two-letter sequences generated by uniform substitutions. We rigorously identify the substitutions that generate either
Brazilian Journal of Physics. Publicado em: 2000-12
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3. Critical behavior of ferromagnetic spin models with aperiodic exchange interactions
We review recent investigations of the critical behavior of ferromagnetic q-state Potts models on a class of hierarchical lattices, with exchange interactions according to some deterministic but aperiodic substitution rules. The problem is formulated in terms of exact recursion relations on a suitable parameter space. The analysis of the fixed points of thes
Brazilian Journal of Physics. Publicado em: 2000-12
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4. Emergence of log-periodic oscillations in periodic and aperiodic Ising models
This work analyzes the emergence of log-periodic oscillations in thermodynamic functions of Ising models on hierarchical lattices. Several situations, where the exchange interactions are periodic or aperiodic, are taken into account. High precision values for the thermodynamic functions are numerically obtained with the method of transfer matrices. Fitting t
Brazilian Journal of Physics. Publicado em: 2000-12
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5. Studies of Thermal Stability of Multivalent DNA Hybridization in a Nanostructured System
A fundamental understanding of molecular self-assembly processes is important for improving the design and construction of higher-order supramolecular structures. DNA tile based self-assembly has recently been used to generate periodic and aperiodic nanostructures of different geometries, but there have been very few studies that focus on the thermodynamic p
The Biophysical Society.
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6. Nonlinear sequence-dependent structure of nigral dopamine neuron interspike interval firing patterns.
Firing patterns of 15 dopamine neurons in the rat substantia nigra were studied. These cells alternated between two firing modes, single-spike and bursting, which interwove to produce irregular, aperiodic interspike interval (ISI) patterns. When examined by linear autocorrelation analysis, these patterns appeared to reflect a primarily stochastic or random p
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7. Using lateral capillary forces to compute by self-assembly
Investigations of DNA computing have highlighted a fundamental connection between self-assembly (SA) and computation: in principle, any computation can be performed by a suitable self-assembling system. In practice, exploration of this connection is limited by our ability to control the geometry and specificity of binding interactions. Recently, a system has
The National Academy of Sciences.
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8. White noise analysis of pace-maker-response interactions and non-linearities in slowly adapting crayfish stretch receptor.
Input-output relations were investigated in the slowly adapting stretch receptor organ of crayfish using a Gaussian white noise length input with a 0.03-12.5 Hz band width and the resulting action potential output. The noise input was presented to the de-efferented receptor in situ, at three mean elongations and at four different amplitudes. The three mean e