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RISS 인기검색어
- 검색키워드
- 저자 : Pevec, A. (검색결과 2 건)
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M. PEVEC,I. POTRC,G. BOMBEK,D. VRANESEVIC 한국자동차공학회 2012 International journal of automotive technology Vol.13 No.5
In the process of developing the brake disc, it is necessary that we predict the suitability of the design. In this manner, we can affirm that even the first prototype will satisfy all of the customer homologation requests. Usually those comprise different sequential braking tests in which the maximal achieved temperature is the criterion that governs brake disc suitability. The knowledge of how to predict the behavior of a brake disc in the early pretesting phase has a significant impact on development costs and time. The common method that is used for predicting the temperatures in the brake disc during braking is numerical simulation analysis. With the help of Computational Fluid Dynamics, the flow through a vehicle ventilated brake disc of known geometry was determined, and the wall heat transfer coefficients for all vehicle speeds and brake disc temperatures were calculated. The results were then imported into a thermal numerical simulation of a sequentialbraking vehicle test. The results showed that the consideration of cooling factors has a significant impact on temperature courses. To obtain accurate results from the numerical simulation and to simulate the vehicle test precisely, the proper wall heat transfer coefficients must be considered. The proposed method produces more accurate numerical results and enables the development engineer to develop suitable brake disc geometry in the early pretesting phase.
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Safaei, E.,Naghdi, N.,Jaglicic, Z.,Pevec, A.,Lee, Y.I. Pergamon Press 2017 Polyhedron Vol.122 No.-
<P>An ethylene diamine derivative of a bis(phenol)diamine ligand (H2L) was synthesized via the Mannich reaction and subsequent ring cleavage of the produced imidazoline ring (H2LIm), and then it was characterized by H-1 NMR and IR spectroscopies and CHN analysis. The iron(III) complex (FeLCI) of this ligand was synthesized and characterized by IR, UV-Vis, X-ray and magnetic susceptibility studies. X-ray analysis reveals that in FeLCl the iron(III) center has a distorted square pyramidal coordination sphere and is surrounded by a chlorine atom, two amine nitrogen and two phenolate oxygen atoms of the ligand. Variable-temperature magnetic susceptibility measurements indicate that FeLCI is a paramagnetic high spin iron(III) complex. It shows weak antiferromagnetic interactions through N-H center dot center dot center dot Cl intermolecular interactions. The ligand-centered electrochemical oxidation of this complex, due to the oxidation of phenolate group to phenoxyl radicals, as well as the electrochemical metal-centered reduction of the ferric ion to the ferrous ion were investigated. In addition, the efficient cleavage by oxygenation of 3,5-di-tertbutyl-catechol with FeLCI in the presence of dioxygen was observed. (C) 2016 Elsevier Ltd. All rights reserved.</P>
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