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화학반응을 이용한 축열식 열교환기의 축열 및 방열특성에 관한 연구
李壽珏 慶一大學校 1996 論文集 Vol.13 No.2
For the purpose of the development of storing heat materials in chemical, the present paper is concerned with the heat-storage/-release characteristics of a regenerative heat exchanger. The heat-storage/-release characteristics is numerically analysed by a methematical modeling. As a result, the effectiveness of the heat exchanger using the chemical reaction is considerably higher than that by the sensible heat.
염화칼슘6수화물과 조핵제와의 반응에서 열역학 및 반응속도에 관한 연구
이수각,박영태 경일대학교 산업기술연구소 1991 産業技術硏究所 論文集 Vol.1 No.-
In this paper, the effects of nucleating ability of SrCl₂ 6H₂O in the CaCl₂ 6H₂O solution is experimentally investigated. The experiment was conducted both the Thermogravimetric Analysis(TGA) and the sample cell system respectively. As a result, it was found within the range of experimental conditions emploed in the present study that the concentration of nucleator, strontium, for the heat storage system of CaCl₂ 6H₂O increase as the nunber of melting-freezing process, and that the location of nucleator like top better than bottom.
CaSO₄1/2 H₂O/CaSO₄계 열화학 반응사이클을 이용한 화학 축열에 관한 연구
朴永泰,崔浩尙,李壽珏 慶一大學校 1993 論文集 Vol.9 No.1
The present paper is concerned with the thermal energy storage by means of a CaSO₄·1/2H₂O/CaSO₄thermochemical reaction cycles. This reaction cycle was applied to a packed-bed type thermal energy unit. The heat release characteristics of the unit accompanied by the exothermic reaction were examined from a fundamental point of view.
Jae-Hwan Cho,Jin-Hyeok Lee,Cheol-Soo Park,Sun-Yeob Lee,Jin Lee,Deog-Hwan Moon,Hae-Kag Lee 한국자기학회 2014 Journal of Magnetics Vol.19 No.3
The purpose of this study is to figure out how uptake counts of technetium (<SUP>99m</SUP>Tc) among radioisotopes in the human body are affected if computed tomography (CT), magnetic resonance imaging (MRI) and isotope examination are performed consecutively. <SUP>99m</SUP>Tc isotope material, iodinated contrast media for CT and paramagnetic contrast media for magnetic resonance (MR) were used as experimental materials. First, <SUP>99m</SUP>Tc was added to 4 cc normal saline in a test tube. Then, 2 cc of CT contrast media such as Iopamidol<SUP>®</SUP> and Dotarem<SUP>®</SUP> were diluted with 2 cc normal saline, and 2cc of MRI contrast media such as Primovist<SUP>®</SUP> and Gadovist<SUP>®</SUP> were diluted with 2 cc normal saline. Each distributed contrast media was a total of 4 cc and included 10m Ci of <SUP>99m</SUP>Tc. A gamma camera, a LEHR (Low energy high resolution) collimator and a pin-hole collimator were used for image acquisition. Image acquisition was repeated a total of 6 times and 120 frames were obtained and uptake counts of <SUP>99m</SUP>Tc were measured (from this procedure). In this study, as a result of measuring the uptake counts of <SUP>99m</SUP>Tc using the LEHR collimator, the uptake counts were less measured in all contrast media than normal saline as a reference. In particular, the lowest uptake counts were measured when Gadovist<SUP>®</SUP>, contrast media for MRI, was used. However, the result of measuring the uptake counts of <SUP>99m</SUP>Tc using the pin-hole collimator showed higher uptake counts in all contrast media, except for Iopamidol<SUP>®</SUP>, than normal saline as a reference. The highest uptake counts were measured particularly when Primovist<SUP>®</SUP>, contrast media for MRI, was used. In performing the gamma camera examination using contrast media and <SUP>99m</SUP>Tc, it is considered significant to check the changes in the uptake counts to improve various diagnosis values.
가역 열화학반응을 이용한 축열에 관한 연구(Ⅲ) : 화학축열재의 반응특성 Reactivity of heat storage mateiral
이영세,김종식,이수각 계명대학교 산업기술연구소 1990 産業技術硏究所 論文報告集 Vol.13 No.2
For the purpose of chemical heat storage, in this study, the ractivities of ??/?? thermochemical reaction cycle were studied from a point of veiw with various kinds of limestone. The reaction rate of the thermochemical reaction cycle was measured using a micro-thermobalance equipped with steam generator. The experimental data was obtained at conditions : the reaction temperature 75-450℃, the reactant particle size under 5μm and the steam concentrations under 25vol. %. In the present study, it was found that the magnesium oxide of the calcined dolomite was not hydrated during the hydration process under the studied experimental conditions. The magnesium oxide of the calcined dolomite was regarded as an inert material for modeling reaction kinetics. The reaction rate constant for the hydration of CaO in the calcined dolomite was about 1.5times higher than that for the hydration of CaO in other calcined limestones, but the reaction rate for the dehydration of Ca(OH)₂is almost constant for all kinds of limestones.
Cellulose Acetate 막의 기체투과특성에 관한 연구
이수각,박영태,최호상,남석태 경일대학교 산업기술연구소 1994 産業技術硏究所 論文集 Vol.4 No.-
Gas permeation characteristics of cellulose acetate membranes, prepared by different methods as like solvent casting method and water casting method, were examined. In case of solvent casting membranes, permeation rate and the effect of Knudsen flow were increased with increasing the time of solvent evaporation. As increasing the polymer concentration, gas permeability of water casting membranes was decreased while selectivity was increased. The values of water casting membrane, such as permeability and selectivity, was in the range between asymmetrics' and symmetrics' those prepared by solvent casting. The gas permeation mechanism seems to obey the combination Poiseuille and Knudsen model and the solution diffusion model with the variation of polymer concentration and the time of solvent evaporation.