The heart of the voltage stability problem is the voltage drop that occurs when the power system experiences a heavy load, and one serious type of voltage instability is voltage collapse. In this paper, a mechanism of the dynamic phenomenon of voltage collapse is presented from the physical point of view. It is shown that an iterative reaction of voltage drop between a dynamic load and the syst...

We study the dynamic susceptibility chi_{T}(Q,t) of deeply supercooled water by means of quasielastic neutron scattering and molecular dynamics simulations. Both techniques show an increase in the peak height of chi_{T}(Q,t) as the temperature is lowered toward the dynamic crossover temperature T_{L} . Below T_{L} , the peak height decreases steadily. We attribute this phenomenon to the change ...

This paper presents a frequency domain identification of dynamic model parameters for frictional presliding behavior. The identification procedure for the dynamic model parameters, i.e., 1) the stiffness and 2) the damping of the presliding phenomenon, is reduced from performing several dedicated experiments to one experiment where the system is excited with random noise and the frequency respo...

Introduction Precision instrumentation systems that measure physical properties using a photodiode or other current-output sensor often include a transimpedance amplifier (TIA) and a programmablegain stage to maximize dynamic range. This article uses a real-world example to show the benefits and challenges of implementing a single-stage programmable-gain TIA to minimize noise while maintaining ...

Industrial demands for more compact heat exchangers are a motivation to find new technology features. Electrohydrodynamics (EHD) is introduced as a promising phenomenon for heat transfer enhancement mechanisms. Similar to any new technology, EHD has not been understood completely yet and requires more fundamental studies. In boiling phase change phenomena, nucleation is the dominant mechanism i...

Friction is a nonlinear phenomenon which has destructive effects on performance of control systems. To obviate these effects, friction compensation is an effectual solution. In this paper, an adaptive technique is proposed in order to eliminate limit cycles as one of the undesired behaviors due to presence of friction in control systems which happen frequently. The proposed approach works for n...

Iran's Islamic revolution had so many effects on political, social, cultural and economic conditions of Shiites outside of Iran and caused a special formation of Muslims identity beliefs in the world, especially shia Muslims. Islamic revolution was a turning point in the Saudi Shia movement to get their spoiled rights by governance structure in Saudi Arabia and helped Shia movements to revive a...

Iran's Islamic revolution had so many effects on political, social, cultural and economic conditions of Shiites outside of Iran and caused a special formation of Muslims identity beliefs in the world, especially Shia Muslims. Islamic revolution was a turning point in the Saudi Shia movement to get their spoiled rights by governance structure in Saudi Arabia and helped Shia movements to revive a...

Background: Muscle fatigue is an important issue in neuromuscular rehabilitation. Better control of this phenomenon would result in better prevention of its consequent physiological damages.Objective: To provide a mathematical representation of muscle fatigue as a function of time.Methods: We conducted this study by combining the EMG-based estimation methods of muscle activation with the availa...

this article analyses the effects of post-zionism in israeli ,society and state. by using the discoursive analysis in social theory, the author argues that discourses such as post-zionism are the results of socio-political and economic conditions (processes), but their evolution is basically the result of the mental and value activities of their proponent, rather than the socio-political proces...