Rotor cage faults as broken rotor bars, increased bars resistance and end-ring faults can be caused by thermal stresses, due to overload, overheating and thus mechanical stresses, magnetic stresses and dynamic stresses due to shaft torques. Environmental stresses as contamination or abrasion also contributes to the rotor cage faults. The rotor cage faults can also lead to the shaft vibration an...

Ultrasonic cleaning of the RBFDP in ethanol for 10 min. The remnants of loose particles after air abrasion may impair wettability of the silane or the primer and the subsequently applied adhesive resin. Ultrasonic cleaning eliminates such remnants best.3 a Professor, University of Zürich, Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable Prosthodontics a...

T he rubber dam has been a useful adjunct in restorative dentistry for many years. With the advent of new techniques and dental materials that are moisture sensitive, rubber dam use has become more imperative. An example of one of these new techniques is the removal of caries using air abrasion. Because the aluminum oxide particles of the air abrasion technique can become a messy paste in the o...

BACKGROUND The goal of this prospective study was to determine risk factors for prolonged air leak (PAL) for patients who underwent video-assisted thoracoscopic surgery (VATS) for spontaneous pneumothorax. METHODS Between January 2002 and June 2012, a total of 2,292 patients were eligible for enrollment in the study: 1,800 patients had primary spontaneous pneumothorax and 492 patients had sec...

OBJECTIVE The aim was to evaluate the effect of different adhesive systems and surface treatments on the integrity of resin-resin and resin-tooth interfaces after partial removal of preexisting resin composites using quantitative image analysis for microleakage testing protocol. MATERIALS AND METHODS A total of 80 human molar teeth were restored with either of the resin composites (Filtek Z25...

This paper summarizes the results of an investigation on carbon dioxide (CO2) sequestration in concrete. Concrete mixtures were not air entrained. Concrete mixtures were made containing Class C fly ash at 0%, 18%, and 35% of total cementitious materials. Effects of three different curing environments on properties of concrete were studied: (1) moist-curing room with 100% relative humidity (RH) ...