نتایج جستجو برای: injection port
تعداد نتایج: 184001 فیلتر نتایج به سال:
An efficient and eco-friendly injection-port tert-butyldimethylsilylated (TBDMS) derivatization and gas chromatography-mass spectrometry (GC/MS) were developed to determine an antibacterial agent, triclosan (TCS), and its metabolite: methyltriclosan (MTCS), in wastewater and surface water samples. The effects of several parameters related to the TBDMS-derivatization process (i.e., injection-por...
background port site complications following elective surgery are rare and port site infections remain the most common short long term complications. objectives the study was conducted to analyze port site complications occurring in patients undergoing laparoscopic cholecystectomy for symptomatic cholelithiasis. patients and methods ninety patients undergoing laparoscopic cholecystectomy were r...
From an ecological aspect, the hydrogen has all properties to be a very good fuel for internal combustion engines. However high speed, as well possibility of backfire, is inconvenient port injection. In this paper, influence injection timing on engine working cycle parameters (pressure and temperature) was investigated deeply. The investigation, parameters, performed numerically by application ...
Fuel cell vehicles are the subject of extensive research and development because of their potential for high efficiency and low emissions. Because fuel cell vehicles remain expensive and the demand for hydrogen is therefore limited, very few fueling stations are being built. To try to accelerate the development of a hydrogen economy, some original equipment manufacturers (OEM) in the automotive...
The preparation of air–fuel mixture is considerably dependent on fluid flow dynamics to achieve improved performance, efficiency, and engine combustion in the appearance of flow. In this study, the effects of mixtures of hydrogen and compressed natural gas (CNG) on a spark ignition engine are numerically considered. This article presents the results of a direct-injection engine using methane–hy...
Oil injected screw compressors are commonly used in the industry. The position and amount of oil injection determined experimentally or by heat balances with an assumption uniform distribution compression chamber, which is not validated. This paper presents a study on within compressor chamber using Computational Fluid Dynamics (CFD) Volume (VOF) multiphase model. Prerequisite for CFD body fitt...
Traditional mechanical control systems in thrust vectoring are efficient in rocket thrust guidance but their costs and their weights are excessive. The fluidic injection in the nozzle divergent constitutes an alternative procedure to achieve the goal. In this paper, we present a 3D analytical model for fluidic injection in a supersonic nozzle integrating an orifice. The fluidic vectoring uses a...
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