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Glass 전이점 이상과 이하에서 polystyrene의 자유 체적의 온도의 영향
류종하 영남이공대학 1982 論文集 Vol.11 No.-
On the assumption that a polymer molecule has constant occupied volume and variable free volume, an equation which describes fractional free volume as a function of temperature is derived as shown belowo; above T_g; f = 1-{exp(-∫_0^(T_g)αGdT-∫_(T_g)^TαLdT)}/1+f_0 below T_g; f = 1-{exp(-∫_0^T-αGdT)}/1+f_0 where αG and αL are thermal expansion coefficient below and above T_g, respectively, and f_0 is fractional free volume at 0˚K. The calculated f from this derived equation shows a good agreement with that calculated from Richardson's empirical equation. For polystyrene the calculated f deviates from that of Richardson's empirical equation with no more than 4.2% deviation limit.
류종하,유성구,박영해,류시옥,서길수 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.4
Calcite, vaterite 그리고 aragonite가 혼합되어 있는 탄산칼슘을 X-선 회절로 분석하였다. 이것은 2성분 혼합물에서 X-선회질의 특성피크의 높이로부터 표준곡선을 작성하여 각각의 조성을 구하였다. 즉, calcite-vaterite 혼합물에서, vaterite의 양은 calcite의 특성피크인 2θ값이 29.32°의 높이에 대한 vaterite의 특성피크인 2θ값이 24.81°, 27.09° 그리고 32.75° 특성피크의 높이비로부터 구하였으며, 이 식의 실험오차는 약 3%이다. 그리고 calcite-aragonite의 호합물에서 aragonite의 양은 calcite의 특성피크인 2θ값이 29.32°의 높이에 대한 aragonite의 특성피크인 2θ값이 26.06°, 38.40° 그리고 45.81° 특성피크의 높이비로부터 구하였으며, 이 식의 실험오차는 약 3%이다. 위의 표준곡선으로부터 3성분의 혼합물의 조성비를 계산할 수가 있다. 합성된 순수한 입자의 혼합물을 위의 방법으로 계산한 결과 실험치와 계산치가 아주 잘 일치하였다. Samples of calcium carbonate were analyzed by X-ray diffraction to determine the polymorphic compositions of calcite, vaterite and aragonite. Standard curves were taken from the peak heights of binary polymorphs mixtures. The content of vaterite in the mixture of calcite and vaterite was obtained from the ratio of the peak heights at 29.32 and 24.81° , 27.09° and 32.75° In this work the experimental error is estimated at about 3 %. For the binary mixture of calcite and aragonite the content of aragonite was determined from the ratio of the peak height of calcite, 29.32° to the peak heights of aragonite, 26.06° , 38.40° and 45.81° The experimental error is estimated at about 3%. Compositions of three polymorphs were estimated from the standard curves. The results from the experiments for the pure synthetic components gave excellent agreement with the calculations.
김종식,류종하 啓明大學校 産業技術硏究所 1991 産業技術硏究所 論文報告集 Vol.14 No.1
or the determining of Gruneisen parameter the ball and string model is applied. From the isothermal Gruneisen parameter the pressure dependence of the bulk modulus for low pressure region es expressed as a function of temperature. The bulk modulus is integrated to give an equation of state for the glassy and liquid polymers. The specific volume of LPE., PS. and PMMA. at various temperature and pressure are calculated from the deried of state and compared with the experimental ones to be quite favorable.
무기수화물을 이용한 축열식 열교환기의 반응특성에 관한 연구
이영세,김종식,류종하 啓明大學校 産業技術硏究所 1992 産業技術硏究所 論文報告集 Vol.15 No.1
In view of the shortage of the energy resource in our country and efficient use of available energy, it is important to develop a system of the chemical heat storage. The Ca(OH)₂/CaO used, in this study, as the specimen of the reversible thermochemical reaction cycle has the greatest potential use as one of the most promising chemical heat storage material. In the first place, the heat and mass transfer characteristics of the fixed bed as a bassis for the system design was numerically analysed by mathematical modeling and the reactivities of Ca(OH)₂/CaO thermochemical reaction cycle for the purpose of chemical heat storage were studied from fundamental point of view with various kinds o limestone. Based on these basic study, The heat -storage/ -release characteristics of the thermochemical reaction of Ca(OH₂)/CaO system was carried out for the application of regenerative heat exchanger with the packed bed type of experimental apparatus. In the present study, it was found that MgO of the calcined dolomite was not hydrated during the hydration process under the studies experimental conditions, Therefore, MgO of the calcined dolomite can be regard as an inert material. Because the reaction was proceeded from the packed bed input to packed bed output and form wall to center, ti could be thought that the rate determining step is not the reaction itself but the heat transfer.
류종하 영남이공대학 2001 論文集 Vol.30 No.-
A setniempirical expression about isothermal bulk modulus, B_γ, for n-nonane is obtained on the supposition that a cluster made of liquid molecules vibrates like a hard sphere in the free surrounds it and the effect of pressure on the occupied volume of n-nonane is space which negligible. The isothermal equation of state, B_γ=B_0[1+B(T)Pⁿ] is integrated to given an equation of state, <원문참조> where B_0 is bulk modulus, P = 0, B(T) + <원문참조>, B(T, P)=[B_γ/B_0]<원문참조>, K_θ=A'a_(a_0)^⅓ and K₁=A_(s₂)/3. The parameters of the equation of state are determined by fitting this equation to the reported data about specific volume of n-nonane. The isothermal bulk moduli, calculated from above equation and parameters, are compared with reported ones.