In high voltage power cable system, partial discharge (PD) is a common phenomenon which reflects the degradation of insulation. When partial discharge happens inside the cable, leakage current will flow through the grounded conductor. To couple the partial discharge current, one feasible and effective method is placing a clamp-on high frequency current transformer around the grounded strap. In ...

Self-discharge of supercapacitor is an important phenomenon that needs to be considered carefully, especially for the applications like wireless sensor networks, memory backup systems, etc. Different types of models have been proposed by the various researchers to capture the supercapacitor dynamics. In this paper, two electrical equivalent circuit models, variable leakage resistance (VLR) mode...

introduction: the provision of an effective apical seal is an essential factor when choosing an appropriate material for success of root-end surgeries. root-end resection, preparation and obturation should provide an adequate apical seal. the aim of this in vitro study was to investigate bacterial and dye microleakage of four different root-end filling materials and compare the efficacy of thes...

PURPOSE To describe the maternal complications due to therapeutic endoscopic procedures in fetal Medicine performed at an university center in Brazil. METHODS Retrospective observational study including patients treated from April 2007 to May 2010 who underwent laser ablation of placental vessels (LAPV) for severe twin-twin transfusion syndrome (TTTS); fetal tracheal occlusion (FETO) and endo...

Received 11/30/2009; accepted 12/8/2009. For correspondence and reprints contact: Wan-Yu Lin, M.D., Department of Nuclear Medicine, Taichung Veterans General Hospital. 160 Section 3, ChungGung Road, Taichung 407, Taiwan. Tel: (886)4-23741349, Fax: (886)4-23741348, E-mail:[email protected] A case of renal insufficiency received Hickman catheter insertion for hemodialysis suffered from fever and...

Rhinorrhoea is a clinical sign of cerebrospinal fluid (CSF) leakage in patients with skull fracture, but can also be attributable to respiratory secretions or tears. Laboratory tests confirming the presence of CSF are not sufficiently rapid to support clinical decision making in the emergency department and may not be universally available. Detection of glucose in nasal discharge was traditiona...

The effects of a corona-discharge plasma treatment on the performance of an AlGaN/GaN metal-oxide-semiconductor high-electron mobility transistor fabricated onto Si substrates were studied. The threshold voltage shifted from −8.15 to −4.21 V when the device was treated with an Al2O3 layer. The leakage current was reduced from 2.9 × 10−5 to 4.2 × 10−7 mA/mm, and the ION/IOFF ratio increased from...

Chamber models are wildly used for a screw vacuum pump capacity calculation. Those allow to take into account lot of factors which have great influence on the capacity, and working power. The first stage chamber models’ development is mathematic description geometrical parameters. This paper presents time-depending parameters, such as volume, areas suction discharge ports, gaps gas leakage goes...

A previously developed reciprocating air microcompressor having a 1-mm(0.04 in)-diameter piston, an inlet port that did not have a moving valve, and an outlet port equipped with a miniature reed valve, was capable of a maximum discharge pressure of 80 kPa (gage, 11.6 psig) at a piston frequency of 100 Hz. We have improved on this compressor performance, and have attained a maximum discharge pre...