Most centrifugal compressors are required to operate over a broad range of flow rates and to provide a high pressure ratio with high efficiency. In order to meet these demands the application of variable geometry techniques is often considered and applied. The potential areas for the application of variable geometry procedures lie at inlet to and discharge from the impeller. This paper reviews ...

objective: although coronary artery disease (cad) is the leading cause of death in type 2 diabetic patients, it is frequently asymptomatic. myocardial perfusion imaging (mpi) is reported to show ischemia in a significant number of asymptomatic diabetic patients. we studied the prevalence and severity of myocardial perfusion defects in asymptomatic diabetic patients and its clinical impact. meth...

A mobile fuel cell systems power output can be increased by pressure amplification using an electric turbocharger. These devices are subject to frequent transient manoeuvres due a multitude of load changes during the mission in automotive applications. In this paper, authors describe simulation approach for turbocharger, considering impact moist air and condensation within cathode gas supply sy...

ABSTRACT Stringent NOx and particulate emission constraints require high levels of exhaust gas recirculation. In this paper we model and analyze a Variable Valve Timing methodology that in steady-state achieves large levels of internal Exhaust Gas Recirculation (iEGR) or residual charge in Compression Ignition Direct Injection (CIDI) engines. Current external Exhaust Gas Recirculation (eEGR) te...

In this paper, a multivariable control strategy based on a parameterized Nonlinear Model Predictive Control (NMPC) approach is proposed for a Diesel engine air path. The aim is to control the level of pollutant emissions by coordinating the Exhaust Gas Recirculation (EGR) and the Variable Geometry Turbocharger (VGT) valves simultaneously. The main feature of the proposed controller lies in its ...

Contact cooling using thermopressor technologies is a promising direction for the development of energy-efficient technologies. This technology based on implementation thermo-gas-dynamic compression effect in special contact heat exchangers that consists increasing pressure while decreasing temperature during evaporation finely dispersed liquid injected into gas flow moving at speed close to so...

Introduction: We aimed to assess whether the vasodilator effect of oral dipyridamole on the left ventricular systolic function in patients with suspected CAD is different from that of intravenous (IV) dipyridamole using Tc-99m MIBI myocardial perfusion gated SPECT. Methods: Eighty-nine patients (17 M / 72 W; 61 ± 10 years) were enrolled in this study. The patients underwent a dipyridamole stre...

Water cooled turbochargers used in gasoline engines present a difficulty studies due to heat transfers both the turbine and compressor. Data available for users is usually measured stable operating conditions with high temperature gradients on side which affects compressor whole turbocharger. The between different elements are not quantified. Heat transfer models necessary quantify amount of ex...

The use of supercharged diesel engines improves the combustion process, increases efficiency engine and overall its operation. As a concomitant beneficial effect, there is an increase in environmental performance engine. All above factors are particularly relevant for solving problem converting so-called "atmospheric" into turbocharged engines, objects conversion can be fleet old models that ha...