An essential modification to a conventional four-stage pseudo-class AB amplifier results in a true class AB amplifier. As opposed to the conventional pseudoclass AB scheme, which uses a current mirror in the third stage, our work uses an adaptive biasing circuit in the third stage in order to drastically reduce quiescent current. The pseudo-class AB and new class AB amplifiers are designed in a...

The electrical distribution network operation depends considerably on network busloads, which are formed by active and reactive power of the substations. Therefore, the network operation variables such as power flows, currents, voltages, etc. change similarly as do loads. It is possible to notice periodicity, temperature dependency, stochasticity etc. This paper describes the distribution netwo...

introduction: human embryonic stem cells (hescs) are pluripotent cells that can proliferate and differentiate to many cell types. their electrophysiological properties have not yet been chracterzed. in this study, the passive properties (such as resting membrane potential, input resistance and capacitance) and the contribution of delayed rectifier k+ channel currents to the membrane conductance...

A novel sliding mode control SMC method for indirect current controlled three-phase parallel active power filter is presented in this paper. There are two designed closed loops in the system: one is the DC voltage controlling loop and the other is the reference current tracking loop. The first loop with a PI regulator is used to control the DC voltage approximating to the given voltage of capac...

A computational investigation is presented of mono-, bi-, and polydisperse lock-exchange turbidity currents interacting with complex bottom topography. Simulation results obtained with the software TURBINS are compared with laboratory experiments of other authors. Several features of the flow, such as deposit profiles, front location, suspended mass, and runout length, are discussed. For a mono...

Phospholamban (PLB) inhibits the sarcoplasmic reticulum (SR) Ca(2+)-ATPase, and this inhibition is relieved by cAMP-dependent protein kinase (PKA)-mediated phosphorylation. The role of PLB in regulating Ca(2+) release through ryanodine-sensitive Ca(2+) release channels, measured as Ca(2+) sparks, was examined using smooth muscle cells of cerebral arteries from PLB-deficient ("knockout") mice (P...

A novel approach of constructing a robust variable-speed drive system using an induction motor supplied from a voltage-source-type PWM inverter is discussed. The inverter is controlled so as to generate the fabricated terminal voltages based on the voltage-decoupled transvector control theory where neither a current feedback loop nor a current limiter circuit is required. Although the hardware ...

Grounding provides safety and in some cases a return circuit for load currents and also an uniform distribution of the voltage on the surface of the earth at power plants. If grounding conductors are damaged, it may cause unintended protective relay operation causing feeders to be tripped. It can also result in failure of the grounding device itself, secondary circuits’ cables and structural el...

Shunt Active Power Filters (SAPFs) represent the most important and widely used filter in industrial purposes due to the fact that, they not only eliminate the harmonic current with a neglected amount of active fundamental current supplied to compensate system losses, but also they are suitable for a wide range of power ratings. One of the key issues for a proper implementation of an active fil...

This paper is concerned with the control strategy for the parallel operation of distributed generation systems (DGS) in a standalone AC power supply. The proposed control method uses only low-bandwidth data communication signals between each generation system in addition to the locally measurable feedback signals. This is achieved by combining two control methods: droop control method and avera...