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- 저자 : Pesic, Milja (검색결과 3 건)
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EFFICIENCY AND ECOLOGICAL CHARACTERISTICS OF A VCR DIESEL ENGINE
R. PESIC,S. MILOJEVIC 한국자동차공학회 2013 International journal of automotive technology Vol.14 No.5
Compression ratio (CR) is a design parameter with highest influence on efficiency, emission and enginecharacteristics. In conventional internal combustion (IC) engines, the compression ratio is fixed and their performance is,therefore, a compromise between conflicting requirements. One fundamental problem is that drive units in the vehicles mustsuccessfully operate at variable speed and loads and in different ambient conditions. If a diesel engine has a fixed CR, aminimal value must be chosen that can achieve a reliable self-ignition when starting the engine in cold start conditions. Indiesel engines, variable compression ratio (VCR) provides control of peak cylinder pressure, improves cold start ability andlow load operation, enabling the multi-fuel capability, increase of fuel economy and reduction of emissions. By application ofVCR and other mechanisms, the optimal regime fields are extended to the prime requirements: consumption, power, emission,noise, etc., and/or the possibility of the engine to operate with different fuels is extended. An experimental Diesel engine hasbeen developed at the Faculty of Engineering, University of Kragujevac. The changes of CR are realized by changing thepiston chamber diameter. Detailed engine tests were performed at the Laboratory for IC engines. Special attention has beengiven to decrease of fuel consumption and exhaust emissions. An optimal field of CR variation has been determineddepending on the given objectives: minimal fuel consumption, minimal nitric oxides, and particulate matter emissions, etc.
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THEORETICAL AND EXPERIMENTAL ANALYSIS OF A CNG CYLINDER RACK CONNECTION TO A BUS ROOF
S. MILOJEVIC,R. PESIC 한국자동차공학회 2012 International journal of automotive technology Vol.13 No.3
From our perspective, a global technology development should be focused on resolving the issues of environmental impact and conservation of available natural energy resources. New technological solutions and alternative fuels, such as Compressed Natural Gas (CNG), have increasingly more application for modern engines and vehicles. If we take into account the situation in city transport, where primarily vehicles with diesel engines are used, a strategic proposal is to begin by retrofitting these into bi-fuel or dedicated Natural Gas Vehicles (NGVs). This paper analyzes the retrofit of a diesel bus into dedicated NGV. To confirm the safety of the vehicle in city transport, we addressed the problem of mounting a gas rack with CNG cylinders on the roof of a retrofitted city bus, according to UN ECE Regulation No. 110. This assembly is the most critical part of the retrofitted bus because of the concentration of stress due to increased mass and the application of a specific installation for supply of CNG from the cylinders to the engine. These regulations must be met in all parts of the vehicle, but we only focused on those areas affected by the retrofit to NGV.
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Cofactor‐Free, Direct Photoactivation of Enoate Reductases for the Asymmetric Reduction of C=C Bonds
Lee, Sahng Ha,Choi, Da Som,Pesic, Milja,Lee, Yang Woo,Paul, Caroline E.,Hollmann, Frank,Park, Chan Beum VCH Verlagsgesellschaft mbH 2017 Angewandte Chemie Vol.56 No.30
<P><B>Abstract</B></P><P>Enoate reductases from the family of old yellow enzymes (OYEs) can catalyze stereoselective <I>trans</I>‐hydrogenation of activated C=C bonds. Their application is limited by the necessity for a continuous supply of redox equivalents such as nicotinamide cofactors [NAD(P)H]. Visible light‐driven activation of OYEs through NAD(P)H‐free, direct transfer of photoexcited electrons from xanthene dyes to the prosthetic flavin moiety is reported. Spectroscopic and electrochemical analyses verified spontaneous association of rose bengal and its derivatives with OYEs. Illumination of a white light‐emitting‐diode triggered photoreduction of OYEs by xanthene dyes, which facilitated the enantioselective reduction of C=C bonds in the absence of NADH. The photoenzymatic conversion of 2‐methylcyclohexenone resulted in enantiopure (<I>ee</I>>99 %) (<I>R</I>)‐2‐methylcyclohexanone with conversion yields as high as 80–90 %. The turnover frequency was significantly affected by the substitution of halogen atoms in xanthene dyes.</P>
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