This paper deals with adaptive control of nonlinear dynamic systems preceded by unknown backlash-like hysteresis nonlinearities, where the hysteresis is described by a dynamic equation. By utilizing this dynamic model and by combining a fuzzy universal function approximator with adaptive control techniques, a stable adaptive fuzzy control algorithm is developed without constructing a hysteresis...

The magnetization processes in binary magnetic/nonmagnetic amorphous alloy Hf57Fe43 are investigated by the detailed measurements including magnetic hysteresis loops, dependence of magnetic moment on temperature and relaxation of magnetic moment. The blocking of magnetization at lower temperatures is accompanied by the slow relaxation of magnetic moment and magnetic hysteresis loops. All of obs...

The synthesis of a heterometallic octanuclear {Cr(III)4Dy(III)4} complex containing fluoride bridges displays SMM behaviour, with highly coercive magnetic hysteresis loops. Intriguingly multiple relaxation processes are revealed and the relaxation times are found to be longer compared to those of an analogous complex with the same metallic core topology.

A coupled thermodynamic/kinetic CALPHAD type modeling of the glass transition for a forming unary substance is proposed. In this quantitative modeling, vibrational contributions to thermodynamic functions crystal and liquid/glass phases are classically modeled using weighed sums Einstein while configurational phase described single internal variable within frame ideal two-state model. The freez...

Aiming to the effect of hysteresis characteristics of giant magnetostrictive materials on the giant magnetostrictive actuator, the actuator’s model is divided into four separate segments. Then, based on the Preisach theory, a model which can describe hysteresis characteristics for the actuator is established. Based on this, feedforward is combined with feedback, and a PID closed-loop feedback c...

Hysteresis, which is the history dependence of physical systems, is one of the most important topics in physics. Interestingly, bi-stability of plasma with a huge hysteresis loop has been observed in inductive plasma discharges. Despite long plasma research, how this plasma hysteresis occurs remains an unresolved question in plasma physics. Here, we report theory, experiment, and modeling of th...

synthesis of bafe12o19 magnetic nano particles via precipitation in different ph conditions have been reported. the certain molar ratio of fe/ba = 12 selected and sodium hydroxide was used as a precipitant agent. x-ray diffraction (xrd), scanning electron microscopy (sem) and vibrating sample magnetometer (vsm) were used to consider the structural, morphological and magnetic properties of bariu...

We introduce a general class of causal dynamic discrete-time nonlinearities which have certain monotonicity and Lipschitz continuity properties. In particular, the discretizations of a large class of continuous-time hysteresis operators obtained by applying the standard sampling and hold operations belong to this class. It is shown that closing the loop around a power-stable, linear, infinite-d...