This paper aims to study the internal aerodynamics of a Miller cycle gasoline engine. uses an over-expanded stroke recover more work, for same amount fuel, than classical Otto cycle. To achieve this, effective compression is made smaller expansion one by closing intake valves prematurely. The in-cylinder tumble flow then stops being driven valve jet before piston reaches bottom dead center, whi...

Although, mechanical heart valves (MHVs) exhibit a durability which is much greater than that of biological substitutes, they are typically prone to thromboembolic events. Consequently, MHV recipients are generally administered with lifelong anticoagulant therapy that must be correctly regulated on the basis of frequent hematological evaluations. The development of thrombi on the valve hinge ma...

A 44-year–old woman underwent mitral valve and tricuspid valve (TV) replacement 6 years earlier using an ATS bileaflet tilting disc prostheses (ATS Medical Inc., Minneapolis, MN) for combined valvular stenosis and regurgitation because of rheumatic heart disease. On a routine clinic visit, the patient reported progressive fatigue and pedal edema over the previous few weeks. On physical examinat...

recently, there have been more reports of cardiac valve infections due to the increasing number of intravenous (iv) drug abusers and chronic renal failure patients. among cardiac valves, tricuspid valve is most commonly affected in the course of endocarditis. appropriate management of these patients is a challenging and controversial issue in the field of cardiac surgery. treatment options in s...

A high-resolution method of spectral analysis, of the class generally called "maximum entropy method," was used in a study of aortic porcine valve closing sounds in 37 patients (ages 19 to 76). Spectra from 27 normal xenografts, implanted from 2 weeks to 61 months previously, were characterized by a dominant frequency peak, F1, at 89 +/- 15 Hz (mean +/- SD), with a lower amplitude peak, F2, at ...

Abstract The high speed, transient cavitating flow distribution inside diesel injector nozzles with consideration of the opening and closing needle valve is calculated using a generalized equation of state (EOS) to describe the fluid density, a homogeneous equilibrium model (HEM) for phase change, and an arbitrary moving mesh to account for needle motion. The KIVA-3V code was modified for the g...

Background We aim to investigate the effect of utilizing aortic valve timing in the measurement of cardiac magnetic resonance (CMR)-derived ejection fraction (EF). Although CMR-derived left ventricular (LV) EF is the gold-standard for volumetric evaluation of the heart, it always reports higher values when compared to other modalities such as echocardiography and radionuclide ventriculography. ...

Echocardiographically recorded mitral valve motion was compared with phasic transmitral flow in 17 open chest dogs. The normal mitral valve opening started with the onset of mitral flow and reached its full excursion while flow was still accelerating. Complete valve opening occurred .044 sec (plus or minus .002 sem) before peak flow, during which time an average of 17.6 percent of total mitral ...