We investigate through a generalized Langevin formalism the phenomenon of anomalous diffusion for asymptotic times, and we generalized the concept of the diffusion exponent. A method is proposed to obtain the diffusion coefficient analytically through the introduction of a time scaling factor λ. We obtain as well an exact expression for λ for all kinds of diffusion. Moreover, we show that λ is a universal parameter determined by the diffusion exponent. The results are then compared with numerical calculations and very good agreement is observed. The method is general and may be applied to many types of stochastic problem.
This work discusses the use of chaos control in smart structures. An archetypal model of a shape memory alloy (SMA) two-bar truss is treated. This system exhibits both constitutive and geometrical nonlinearities presenting a complex nonlinear dynamics response including either the snap-through or the chaotic behaviors. A constitutive model that presents a close agreement with experimental data is employed to describe the themomechanical SMA behavior. A variation of the continuous time-delayed feedback method is employed as a control strategy. This variable structure controller is applied to the stabilization of unstable periodic orbits of the SMA structure avoiding the snap-through behavior.
The objective of this review was to approach the intensive pasture termination system (IPT) as a possible alternative for the development of beef cattle in the semiarid region. Pasture are still the cheapest and most practical way in livestock as a source of food for cattle. In semi-arid regions, seasonality causes forage productivity to be low, causing a nutritional deficit in the animals. Strategies and technologies are developed to promote alternatives that supply nutritional deficiencies with forms of supplementation. One of them, TIP, brings the concept of confinement to the pasture, bringing good results and low structural and operational cost.
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