In the thesis the aim was to detect the high impedance fault occurring on radial distribution system using a new generic search algorithm. A Three layer perceptron was used for distinguishing the linear and nonlinear high impedance faults by taking the feature vector as input value of third and fifth harmonic components of feeder voltage and feeder current were used as a feature vector obtained...

An exact analytic solution is derived for the 2D acoustic pressure field generated by a time-harmonic line mass source located above an impedance surface with uniform grazing flow. Closed-form asymptotic solutions in the far-field are also provided. The analysis is valid for both locally-reacting and nonlocally-reacting impedances, as is demonstrated by analysing a nonlocally reacting effective...

Scanning Impedance Microscopy (SIM) is one of the novel scanning probe microscopy (SPM) techniques, which has been developed to taking image from sample surface, providing quantitative information with high lateral resolution on the interface capacitance, and investigating the local capacitance–voltage (C–V) behavior of the interface and AC transport properties. The SIM is an ordinary AFM equip...

Low-frequency oscillation, harmonic oscillation and instability issues in railway vehicle-grid systems pose challenges to the system stability safe operation. Previous studies constructed linear time-invariant impedance model of system, which ignored internal frequency coupling loss accuracy. To fill this gap, modelling method based on linearisation is proposed. The derived provides a clear phy...

Stiffness- and relaxation-based diastolic function (DF) assessment can characterize the presence, severity, and mechanism of dysfunction. Although frequency-based characterization of arterial function is routine (input impedance, characteristic impedance, arterial wave reflection), DF assessment via frequency-based methods incorporating optimization/efficiency criteria is lacking. By definition...

We investigate the influence of collective plasma modes in a field-effect transistor channel under different excitations and biasing conditions. First, we study the case of a device externally-excited by a harmonic optical beating or an electronic excitation and current-driven at the drain. The harmonic and continuous responses of the transistor are calculated using a pseudo-two-dimensional hyd...

Flexural transducers are well suited for power emission in fluids, thanks to their low mechanical impedance. Their performance is nevertheless compromised by the occurrence of non-linearities stemming from high-deflection andlor high electric field. This experimental work catalogs typical alterations of the transducers' dynamics resulting specifically from high electrical field non-linearities....

Stepped impedance resonator with harmonic suppression and capability of frequency tuning have been incorporated into a bandpass filter design. A tapped-in U-shaped feed structure is introduced in the design to suppress harmonic and to reduce the passband insertion losses. The passband flexibility is accomplished by using a pair of tuning varactors. A simple method to implant a zero in the frequ...