This paper addresses the distributed optimal fre-quency control of power systems considering a network-preserving model with nonlinear power flows and excitationvoltage dynamics. Salient features of the proposed distributedcontrol strategy are fourfold: i) nonlinearity is considered tocope with large disturbances; ii) only a part of generatorsare controllable; iii) no lo...

It is well known fact that binary relations are generalized mathematical functions. Contrary to functions from domain to range, binary relations may assign to each element of domain two or more elements of range. Some basic operations on functions such as the inverse and composition are applicable to binary relations as well. Depending on the domain or range or both are fuzzy value fuzzy set, i...

in this paper, gaussian and elliptic high pass filters are analyzed for image sharpening qualitatively and quantatively . the filters are implemented in frequency domain using matlab software. experiments are performed to compare the performance of both the filters ,processed images are presented. the results demonstrate that elliptic yields better results.

in this work, time domain analysis is used to solve adler’s equation in order to obtain the required time, for an oscillator under external injection, reaching the steady-state condition. mathematical approach has been applied to fully describe the transient of frequency acquisition in injection-locked lc and ring oscillators considering their time-varying nature. then, the analysis is verified...

The magnetoresistance of a one-dimensional electron gas in a metallic ferromagnetic nanowire containing two atomic-size domain walls has been investigated in the presence of spin-orbit interaction. The magnetoresistance is calculated in the ballistic regime, within the Landauer-Büttiker formalism. It has been demonstrated that the conductance of a magnetic nanowire with double domain walls...

The results of more than 20 years of UMRAO multifre-quency single antenna observations of BL Lac reveal a series of polarized outbursts. Comparison of these results with VLBI maps shows that for many bursts the electric vector of the polarized emission (EVPA) is parallel to the observed jet structure, and several of these bursts have been quantitatively modeled by weak, transverse shocks propag...