Piezoelectric force microscopy (PFM) has demonstrated to be a powerful tool characterize ferroelectric materials. However, extrinsic effects, most notably, those resulting from surface charges, often mask or mirror genuine piezoelectric response, challenging PFM data understanding. The contribution of charges signal is commonly compensated by using appropriate external bias voltage, which ad-ho...

The presence of an integrator in a reference model rotor flux-based adaptive system (RF-MRAS) and non-linearity the inverter output voltage degrade speed response sensorless operation electric drive terms DC drift, initial value issues, inaccurate acquisition. To improve response, compensating component is supplemented by amending integrator. coalition drift offset voltages, reduces issues. Dur...

An acceleration element is proposed for compressing the electron pulse duration in a femtosecond photoelectron gun. The element is a compact metal cavity with curved-shaped walls. An external voltage is applied to the cavity where a special electric field forms in such a way that the slow electrons in the electron pulse front are accelerated more than the fast electrons, and consequently the el...

–With the widespread use of harmonic generating devices, the control of harmonic currents to maintain a high level of power quality is becoming increasingly important. An effective way for harmonic suppression is the harmonic compensation by using active power filter. This paper presents a comprehensive survey of DSTATCOM control strategies put forward recently. It is aimed at providing a broad...

In this study, an alternative control method is proposed to improve the harmonic suppression efficiency of the active power filter in a distorted and unbalanced power system to compensate the perturbations caused by unbalanced non-linear loads. The proposed method uses a selftuning filter (STF) to process the grid voltage in order to provide a uniform reference voltage to obtain the correct ang...

In digital current mode controlled DC-DC converters, conventional current sensors might not provide isolation at a minimized price, power loss and size. Therefore, a current observer which can be realized based on the digital circuit itself, is a possible substitute. However, the observed current may diverge due to the parasitic resistors and the forward conduction voltage of the diode. Moreove...