In more electric aircrafts (MEA) the electric power network is important for the reliability. To prevent severe faults it is the key issue to identify the faults in the early stage before a complete failure happens. In this paper an early stage fault detection method using wavelet multi-resolution analysis (MRA) for a regulated buck DC-DC converter is studied. Specifically, the electrolyte inpu...

This paper presents the design of a hybrid scheme of wavelet transforms and an adaptive Fourier filtering technique for on line fault detection and phasor estimation to fast distance protection of transmission lines. The wavelet transform is used as a signal processing tool. The sampled voltage and current signals at the relay location are decomposed using wavelet transform-Multi Resolution Ana...

BACKGROUND AND PURPOSE High-resolution contrast-enhanced MR angiography (CE-MRA) acquired at 3T exquisitely depict carotid artery (CA) stenosis. In this study, we examined the agreement of different vessel-analysis tools with manual quantitative measurement by 2 readers using CE-MRA data. MATERIALS AND METHODS Three vessel tools determining the trajectory of the vessel of interest and, subseq...

Contrast-enhanced MR-Angiography (CE-MRA) has evolved into the standard, noninvasive imaging modality for vascular imaging of the body. It allows for high spatial resolution with submilimeter voxel sizes, a large field of view and it can be acquired in 15-25s. It relies on the administration of Gd-based contrast agent of which typically 0.2mmol/kg is administered. At 3.0T, the administered dose...

One of most important elements of Electric Power Systems (EPS) is the transmission line (TL), which is permanently under adverse conditions especially lightning strokes. At the moment, those phenomena have been the root cause of short circuits and the most important cause of mal-operation of transmission line protection relays. Thus, this paper develops the classification of lightning transient...

In the previous chapters, instantaneous p-q theory was used for reference current extraction. This approach has fast response and the computational time required is also small. But, its performance under noisy voltage condition is found to be not satisfactory. In this chapter, a frequency domain based method is proposed for reference current extraction which is suitable for noisy voltage condit...

Introduction: Large, prospective, randomized trials have identified an improvement in outcome by offering surgery to neurologically symptomatic patients with severe carotid stenosis [1]. In symptomatic patients with moderate carotid stenosis (<70%) or in asymptomatic patients with carotid disease, the optimal treatment strategy remains ambiguous. Recently, multi-contrast, in vivo MR vessel wall...

We present the first Herschel PACS and SPIRE results of the Vela C molecular complex in the far-infrared and submillimetre regimes at 70, 160, 250, 350, and 500 μm, spanning the peak of emission of cold prestellar or protostellar cores. Column density and multi-resolution analysis (MRA) differentiates the Vela C complex into five distinct sub-regions. Each sub-region displays differences in the...

PURPOSE To develop a technique for high resolution, four-dimensional (4D), multiphase, steady-state imaging with contrast enhancement (MUSIC) in children with complex congenital heart disease. METHODS Eight pediatric patients underwent cardiovascular MRI with controlled mechanical ventilation after ferumoxytol administration. Breath-held contrast-enhanced MRA (CE-MRA) was performed during the...