Abstract Nowadays, progressive improvements of engine performance must be performed to reduce fuel consumption, which directly affects the amount CO2 released in atmosphere. For this purpose, considering modern technologies automotive scenario, Gasoline Compression Ignition (GCI) combustion might represent one promising solution, since it experiences high thermal efficiency Ignited (CI) engines...

A bstract We revisit the construction of 2d conformal blocks primary operator four-point functions as bilocal vertex correlators. find an additional interpretation a path integral over reparametrizations intermediate cylinder. As consequence we bridge gap between Kähler quantization virasoro coadjoint orbits, SL(2 , ?) Chern-Simons theory and reparametrization formalism CFT that has made appear...

s spring In some nuclear reactor containment isolation applica­ Greek tions, butterfly valves with pneumatic actuators are used to close pipelines in the event of containment p density pressure transients resulting from postulated acci­ e angular position dents. A model is developed which predicts the closure time history of such valve/actuator systems INTRODUCTION under prescribed transients. ...

A practical approach to design a feedforward-plus-proportional-integral-derivative (FPID) controller for accurate and smooth velocity control on a hydraulic linear actuator is presented. The integrated controller consists of a feedforward loop and a PID loop. The feedforward loop is designed to compensate for the nonlinearity of the electrohydraulic system, including the deadband of the system ...

Mathematical models have been popularly applied to study the compression processes of superheated refrigerant vapor in compressors. As to the case when refrigerant enters a compressor cylinder in the state of liquid and vapor mixture, however, the availability of fundamental studies is very limited. -A mathematical model is presented to simulate the compression processes of two-phase saturated ...

In this paper, effects of EHD actuators on hydrodynamic behavior and heat transfer of air flow over a circular cylinder were considered. Pressure and temperature distributions around the cylinder were measured in presence of wire-plate EHD actuators. The Reynolds number based on cylinder diameter (d) were 3500, 7000. Experiments were performed for various configurations. Based on obtained resul...

transcatheter aortic valve replacement (tavr) is a novel therapeutic intervention for the replacement of severely stenotic aortic valves in high-risk patients for standard surgical procedures. since the initial partner trial results, use of tavr has been on the rise each year. new delivery methods and different valves have been developed and modified in order to promote the minimally invasive p...

the prospect of surgery can be frightening and more extensive surgery is included more anxious . knowledge of how to surgery reduces anxiety. hence,our goals are as follows :   what conditions can cause heart surgery? the majority of adults who should be considered for cardiac surgery , suffer from the disease of the heart valves or coronary artery disease or both.also, a few of them have conge...