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Consequences of electronic excitations in CoFe<sub>1.90</sub>Dy<sub>0.10</sub>O<sub>4</sub>
Kumar, H.,Singh, J.P.,Srivastava, R.C.,Negi, P.,Agrawal, H.M.,Asokan, K.,Won, S.O.,Chae, K.H. Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.12
Present work reports the irradiation induced effects in Dy<SUP>3+</SUP> doped cobalt ferrite nanoparticles in the regime of dominant electronic excitation processes induced by 100 MeV O<SUP>7+</SUP> ion irradiation. Irradiation leads to the deterioration of crystalline phase as envisaged by X-ray diffraction. Crystallite size decreases with the increase of irradiation fluence. Disappearance of certain bands in Raman spectra at higher fluence of irradiation confirms the crystalline disorder induced by electronic excitations. Fourier transform infrared spectra show onset of cation migration from tetrahedral site to octahedral site and vice versa. X-ray absorption fine structure measurements depict the preservation of valence state of metal ions after irradiation. These measurements further infer bond breaking process in irradiated materials. Magnetic measurements carried out on these materials indicate slight increase of saturation magnetization at room temperature followed by the decrease of coercive field. Obtained results are discussed on the basis of appropriate mechanism.
Optimization of Diesel Fuel Injection System with Numerical Analysis.
J.O.Chae,S.M.Lee,J.W.Hwang,I.J.Yang,V.V.Kondrashov,A.N.Oznobishin,Y.S.Jeong 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
This paper describes results of application of an object oriented method of simulation to the process of obtaining optimum parameters of diesel fuel injection systems, Numerical cod [NJCALC has been developed considering for the first time the optimization of effects of propagation phenomena of pressure waves inside the branches of fuel injection systems, Simulation results trom numerical experiment demonstrate the high sensitivity of the injection system characteristics with variation of holes now discharge coefficients, the influence of pressure throbbing and the cumulative inertia mass flow which can not be neglected because it is strictly related on physical cause both to the beginning/end time of the injection and to the shape of injection rate.<br/>
COMPARATIVE STUDY OF ELECTROMAGNETIC AND CONVENTIONAL FUEL INJECTION SYSTEMS ON REAL DIESEL ENGINE
J.O.Chae,J.S.Yang,J.W.Hwang 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The investigation of the new-developed electromagnetic fuel injection system for diesel engine showed its considerable advantages comparing with the conventional mechanical type. The new system allows to approach to the smokeless operation of diesel engine. It is achieved not only due to injection timing control and also due to two-pulse injection. The system has demonstrated its reliability in the long time test.<br/>
J.O.Chae,D.C.Choi,S.I.Moon 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The further progress in the development of the method of misfire diagnostics based on the effect of modulation of the breakdown voltage between electrodes of a spark-plug was achieved by means of Fourier transform of the output signal. Strong correlation between the misfire appearance and the level of the second harmonic in the signal of breakdown voltage obtained from the spark-plug was found. It allows us to establish a quantitative criterion of misfire.<br/>