In this paper we present a thorough analysis of two systems magnetically inhomogeneous: the manganite La<Subscript>0.7</Subscript>Sr<Subscript>0.3</Subscript>MnO<Subscript>3</S ubscript>/MgO and the amorphous alloy Cu<Subscript>90</Subscript>Co<Subscript>10</Subscript>. In both cases, the non-extensive statistics yield a faithful description of the magnetic behavior of the systems. In the model proposed here,...</subscript></subscript><//s></subscript></subscript></subscript>

A simple theory for the conformational properties of highly charged flexible chains is presented. The scaling exponent γ describing the end-to-end distance R≡b(Z−1)γ is obtained, where b is the distance between monomers and Z is the number of monomers of a single chain. We find that at...

The Casimir force has its origin in the finite modification of the infinite zero-point energy induced by a specific boundary condition for the spatial configuration. In terms of the imaginary-time formalism at finite temperature, the root of Planck's law of radiation can be traced back to the...

Dissipative one-dimensional maps may exhibit special points (e.g., chaos threshold) at which the Lyapunov exponent vanishes. Consistently, the sensitivity to the initial conditions has a power-law time dependence, instead of the usual exponential one. The associated exponent can be identified...

Transfection of an anionic polynucleotide through a negatively charged membrane is an important problem in genetic engineering. The direct association of cationic surfactant to DNA decreases the effective negative charge of the nucleic acid, allowing the DNA-surfactant complex to approach a...