Failure mode and effect analysis , visual inspection, electrical tests, X-ray observation, optical microscopy and scanning electron microscopy were performed on failed linear GaAs MMIC voltage variable absorptive attenuators. Human body model electrostatic discharge tests and electrical overstress tests were performed to replicate the failures. The studies showed that the failure locations and ...

• The role of the electrical pacemaker with myocardial electrodes in the treatment of atrioventficular conduction blocks is an important one. Various observers, however, have reported a progressive increase in power needed to stimulate the heart and eventual failure of stimulation. The reason for this stimulation failure has been reported as due to increased electrical resistance from scar form...

power transformers are key components in electrical power supplies and their failure could cause severe consequences on continuity of service and also generates substantial costs. identifying problems at an early stage, before catastrophic failure occurs, is a great benefit for reliable operation of power transformers. frequency response analysis (fra) is a new, well-known and powerful diagnost...

Circuit Breakers (CBs) are critical components in power system for reliability and protection. To assure their accurate performance, a comprehensive condition assessment is of an imminent importance. Based on dynamic resistance measurement (DRM), this paper discusses a simple yet effective fuzzy approach for evaluating CB’s electrical contacts condition. According to 300 test results obta...

Abstract: The big share of electrical breakdown in electrical devices failure among other factors is caused by multitasking such as electrical insulation, mechanical support, energy dissipation, Energy storage, etc. which brings many attentions to lifetime estimation of said insulation material. Up to now, there was no-general theory had been suggested for lifetime estimation of mentioned insul...

OBJECTIVE To confirm that electrical myostimulation is a good alternative to conventional aerobic training in patients with chronic heart failure and to compare the effects of both training programmes in patients with different exercise capacities. PATIENTS AND METHODS A total of 44 patients with stable chronic heart failure underwent 5 weeks of exercise training, with electrical myostimulati...

OBJECTIVE To investigate the occurrence of heart failure complications, and to identify variables that predict heart failure in patients with (recurrent) persistent atrial fibrillation, treated aggressively with serial electrical cardioversion and antiarrhythmic drugs to maintain sinus rhythm. DESIGN Non-randomised controlled trial; cohort; case series; mean (SD) follow up duration 3.4 (1.6) ...

RATIONALE Deterioration of ventricular fibrillation (VF) into asystole or severe bradycardia (electrical failure) heralds a fatal outcome of cardiac arrest. The role of metabolism in the timing of electrical failure remains unknown. OBJECTIVE To determine metabolic factors of early electrical failure in an ex-vivo canine model of cardiac arrest (VF+global ischemia). METHODS AND RESULTS Meta...