This paper presents a failure analysis on a failed intake valve in a gasoline engine. During an endurance test, an intake valve was broken and caused some damages on the piston. Material examinations (by a light microscope and also a scanning electron microscope) were conducted on the fracture surface of the intake valve shaft. Results showed that no pores or defects could be observed and the m...

A young man with IHSS who developed complete heart block was successfully treated with a permanent pacemaker. Echocardiography and other noninvasive techniques showed marked cycle-to-cycle variation in the evidence of subvalvular obstruction which decreased markedly when atrial systole preceded the ensuing paced complex by an appropriate interval. Because cycle length and therefore afterload we...

In this work we have investigated the integrated diaphragm micropump as an active fluidic control approach for the on-demand generation of droplets with precisely defined size, frequency and timing. In contrast to valve-actuated devices that only modulate the flow of the dispersed phase being continuously injected, this integrated micropump allows the combination of fluidic transport and modula...

Background Degenerative Mitral Valve Regurgitation (DMR) is a severe form of mitral valve disease for which the survival rate is poor if left untreated. Defining the optimal timing for surgery is challenging in spite of advances in diagnostic imaging. No sensitive measure of left ventricular dysfunction from CMR have yet been reported since the ejection fraction (EF) is usually preserved in DMR...

Four patients had evidence that mitral valve prolapse was the etiology of isolated early systolic clicks that were "ejection" in timing, that is, within 80 msec of the first heart sound (S1). Phonocardiography demonstrated movement of the click closer to S, (three patients) with no change (three patients) or an increase in click amplitude (one patient) on inspiration. Earlier movement of systol...

Most large commercial vessels are propelled by low-speed two-stroke diesel engines due to their fuel economy and reliability. With increasing international concern about emissions the rise in oil prices, improvements engine efficiency urgently needed. In present work, a zero-dimensional model for is developed that considers exhaust gas bypass geometry structures exchange model. The was applied ...

The main purpose of this paper is to study various configurations of a magnetorheological (MR) damper valve and to evaluate their performance indices typically dynamic range, valve ratio, inductive time constant and pressure drop. It is known that these performance indices (PI) of the damper depend upon the magnetic circuit design of the valve. Hence, nine valve configurations are considered fo...