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Triazine Thiol 유도체에 의한 1-Chlorobutadiene - Butadiene Copolymer 의 안정화효과에 관한 연구
유종선,백남철,산하진삼 한국고무학회 1987 엘라스토머 및 콤포지트 Vol.22 No.2
In this study, as one of the developing ways of the functional elastomer, improvement of the functionality of CB-BR was attemped through stabilization. At first the stabilization effect of CB-BR and the concentration dependancy in CBBR were determined. Then, triazine thiol derivative(BPTT) was synthesized by reacting p-aminodiphenylamine with cyanuric chloride. Further the functional mechanism and the effects of the antioxidants were investigated using BPTT together with other various antioxidants in liquid and solid states. The results obtained are as follows: 1) The aging of CB-BR depended on the concentration and temperature. Thus, at a low temperature of 50℃, the aging proceeded with gel formation; at high temperature above 100℃ and in above 4wt% concentration, the aging occured by the formation of gel. And in concentrations below that, the aging proceeds with a decomposition caused by oxygen attacked to elastomer molecules. 2) The effect of antioxidation of CB-BR in the liquid state was at it's best when the MBIZ and BPTT were used at 110C, 4hrs after the oxidation. 3) The effect of antioxidation of CB-BR in the solid state was the best choice the simultaneous use of NDBC and BPTT at 50℃, 30days after the oxidation.
Lee, Sang Won,Bae, Seongtae,Takemura, Y.,Yamashita, E.,Kunisaki, J.,Zurn, S.,Kim, Chul Sung IEEE 2006 IEEE transactions on magnetics Vol.42 No.10
This paper reports first on the very promising self-heating and temperature rising characteristics of solid-state NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles for hyperthermia applications. NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles were prepared by using both the "high temperature thermal decomposition method (HTTD)" and the "newly modified sol-gel" methods. The magnetic properties and cell-cytotoxic properties of the synthesized NiFe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles were investigated to consider these nanoparticles for in vivo hyperthermia applications. The saturation magnetic moments measured by a high sensitive SQUID were between 43.0 and 47.6 emu/g. The cell survival rates of NiFe<SUB>2</SUB>O<SUB>4</SUB> and chitosan coated NiFe<SUB>2</SUB>O<SUB>4</SUB>, which were determined by MTT assay, around 85 % and 98.8 %, respectively. The maximum self-heating temperature induced by our specially designed RF-MRI modified L-C circuit was 47.3°C and the frequency and magnetic field product, H<SUB>0</SUB>f was 1.07 × 10<SUP>9</SUP> Am<SUP>-1</SUP> s<SUP>-1</SUP>.
Field electron emission from polycrystalline GaN nanorods
S. Hasegawa,S. Nishida,T. Yamashita,H. Asahi 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.3
We have grown polycrystalline GaN both on polycrystalline Mo sheets and on Si(001) substrates with native oxide by using plasma-assisted molecular beam epitaxy. It has been found that GaN growth on Si(001) with native oxide produces well corientated nanorods exhibiting a low field emission threshold of 1.25 V/μm at 0.1 μA/cm2 and a high emission current density of 2.50 mA/cm2 at an applied electric field of 2.5 V/μm. We will review the growth of polycrystalline GaN films and the evaluation of their structural properties and electron field emission characteristics.
INFLUENCE OF THE MIXING RATIO OF DOUBLE COMPONENTIAL FUELS ON HCCI COMBUSTION
S. SATO,S. P. KWEON,D. YAMASHITA,N. IIDA 한국자동차공학회 2006 International journal of automotive technology Vol.7 No.3
For practical application on the HCCI engine, the solution of subjects, such as control of auto-ignition timing and avoidance of knocking, is indispensable. This study focused on the technique of controlling HCCI combustion appropriately, changing the mixture ratio of two kinds of fuel. Methane and DME/n-Butane were selected as fuels. The influences, which the mixing ratio of two fuels does to ignition timing, ignition temperature, rate of heat release and oxidation reaction process, were investigated by experiment with 4-stroke HCCI engine and numerical calculation with elementary reactions.
INFLUENCE OF THE MIXING RATIO OF DOUBLE COMPONENTIAL FUELS ON HCCI COMBUSTION
Sato, S.,Kweon, S.P.,Yamashita, D.,Iida, N. The Korean Society of Automotive Engineers 2006 International journal of automotive technology Vol.7 No.3
For practical application on the HCCI engine, the solution of subjects, such as control of auto-ignition timing and avoidance of knocking, is indispensable. This study focused on the technique of controlling HCCI combustion appropriately, changing the mixture ratio of two kinds of fuel. Methane and DME/n-Butane were selected as fuels. The influences, which the mixing ratio of two fuels does to ignition timing, ignition temperature, rate of heat release and oxidation reaction process, were investigated by experiment with 4-stroke HCCI engine and numerical calculation with elementary reactions.