This paper presents the synthesis of an adaptive observer which is used for the improvement of the direct torque control of induction motor drives. The observer detects stator flux components in two-phase stationary reference frame, rotor speed and stator resistance by measure of the stator terminal voltages and currents. The observer is adapted using a simple algorithm which does not imply a h...

In the resonance ratio control, which we proposed for vibration suppression and disturbance rejection in torsional system, the estimation speed of the disturbance observer should have been much faster than the resonance frequency of the controlled system. However, too fast disturbance observer sometimes causes implementation problem. In this paper, we give the optimal speed of the disturbance o...

A state feedback control method for an interleaved boost power converter is designed, which, in turn, can achieve interleaved current sharing among parallel-connected converters. The state feedback control in the continuous time domain is derived using the pole placement technique and linear quadratic optimal method. The load estimator is designed by deriving a full-order state observer to ensu...

The bending of light due to the curvature of spacetime close to a black hole is so strong that light can even return to the point of emittance yielding an Einstein ring. Using the analytic solution of the geodesic equation in Schwarzschild spacetime and a distant star or a flash of light, we will be able to determine the mass of a black hole as well as the distance of the observer to this black...

the concept of fuzzy soft γ-ring is introduced; and some properties of fuzzy soft γ-rings are given. then the definitions of fuzzy soft γ-ideals are proposed and some of their theories are considered.

The passivity-based control (PBC) is recognized as an effective energy shaping approach to guarantee the asymptotic stability of whole system by using passivity property. However, model- and sensor-based characteristics limit its development application. combination PBC online estimation technique can solve these problems. purpose this article propose a controller observer, which are designed s...

introduction: inferior mandibular bolck anesthesia, some time causes postoperative lip and tongue biting trauma, however, an infiltration injection with a limited anesthetized area, has less complications. the aim of present study is to compare of two techniques (block and infiltration) for class i restorative treatment in primary second molars. methods and materials: fourty children between 5-...

The backreaction on black holes due to dragging heavy, rather than test, objects is discussed. As a case study, a regular black Saturn system where the central black hole has vanishing intrinsic angular momentum, J = 0, is considered. It is shown that there is a correlation between the sign of two response functions. One is interpreted as a moment of inertia of the black ring in the black Satur...