conventional compression ignition (ci) engines are known for their high thermal efficiency compared to spark ignited (si) engines. gasoline because of its higher ignition delay has much lower soot emission in comparison with diesel fuel. using double injection strategy reduces the maximum heat release rate that leads to nox emission reduction. in this paper, a numerical study of a gasoline fuel...

in the present work, the simultaneous effects of fuel injection rate and injection of air jet into the combustion chamber on exhaust emissions, combustion process and performance parameters in a direct injection diesel engine were investigated. in order to create an air jet, a design was presented in which a secondary chamber (air cell) was created inside the cylinder and was joined to the main...

We present Chandra gas temperature maps for two hot, intermediate-redshift clusters A665 and A2163. Both show strong temperature variations in their central r = 0.5h−1 Mpc regions, naturally interpreted as product of the subcluster mergers. The A665 map reveals a shock in front of the cool core, while the temperature structure of A2163 is more complicated. On a larger linear scale, our data on ...

results first needle placement without imaging resulted in blood return in 1/199 participants and positive epidurography in 179/199 (90%). minimal needle repositioning resulted in a positive epidurogram in the remaining 19 attempts. no intravascular injection patterns were observed. conclusions this compares favorably to published success rates of fluoroscopically-guided technique and was well ...

We designed a novel catheter for simultaneous angiography of ipsilateral pulmonary veins (PVs), so that the catheter tip with side holes can be introduced into the inferior PVs and a second curve with side holes into the superior PVs. The simultaneous angiogram of the ipsilateral PVs, using this novel catheter, reveals more clearly the PV ostium to antrum, because simultaneous injection of cont...

BACKGROUND Ghrelin plays an important role in the regulation of food intake and body weight. It also decreases testosterone and opioid secretion. OBJECTIVES The goal of the present study was to investigate the effect of testosterone, morphine or simultaneous injection of testosterone and morphine on mean serum ghrelin concentration in sheep. MATERIALS AND METHODS Ten sheep were divided into...