• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.16 no.4
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• pp.46-54
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• 2002

A dielectric pellets bedded parallel plates with a membrane centered have been proposed as an ion separation and collection system in water. and effects of the relative dielectric constant and the applied square wave pulse voltage on the characteristics of ion separation and collection in tap water and NaCl dissolved tap water have been investigated. As a result, electrolyzed water of pH 3.1 and 10.6 were obtained with only tap water at the pulse current of 1.0[A] and flow rate of 0.5[LPM]. And the higher ionized water of pH 2.8 and pH 11.7 ware obtained in 0.1[%wt] NaCl dissolved water. When the dielectric pellets of BaTiO$_3$ having the highest dielectric constant were bedded in the ion separation and collection cell, the ionized water of pH 2.7 and pH 11.7 were obtained with only tap water. And the ionized water of pH 2.4 and pH 12.0 were obtained in 0.1[wt%] NaCl dissolved tap water with the dielectrics pellets bedded ones.

• Analytical Science and Technology
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• v.24 no.6
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• pp.467-476
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• 2011

Solubility data of carbon dioxide ($CO_2$) in the imidazolium-based ionic liquids with methylsulfate anion are presented at pressures up to about 45 MPa and at temperatures between 303.15 K and 343.15 K. The ionic liquids studied in this work were 1-ethyl-3-methylimidazolium methylsulfate ([emim][$mSO_4$]), 1-butyl-3-methylimidazolium methylsulfate ([bmim][$mSO_4$]). The solubilities of $CO_2$ were determined by measuring the bubble point or cloud point pressures of the binary mixtures using a high-pressure equilibrium apparatus equipped with a variable-volume view cell. The equilibrium pressure increased very steeply at high $CO_2$ compositions. The $CO_2$ solubility in ionic liquids increased with increase of the total length of alkyl chains attached to the imidazolium cation of the ionic liquids. The phase equilibrium data for the $CO_2$ + ionic liquid systems have been correlated using the Peng-Robinson equation of state.

• Clean Technology
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• v.11 no.3
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• pp.147-152
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• 2005

For estblishing the best technique for the micronization of Ibuprofen using supercritical fluids, the solubility should be known. The solubility of Ibuprofen in supercritical carbon dioxide was measured by observing the cloud point. The cloud point was observed using high pressure equipment equipped a variable volume view cell between temperature of 35, 40 and $45^{\circ}C$. The solubility data was correlated by the Peng-Robinson equation of state Solute physical properties, such as critical temperature (Tc), critical pressure (Pc) and acentric factor (${\omega}$) were estimated by the some group contribution method. As pressure was increased, the solubility increased at constant temperature. The retrograde phenomenon by a solute vapor pressure and a density of solvent was observed at the pressure of around 150bar. It was found that $CO_2$ can be used as a supercritical solvent in micronization of ibuprofen by RESS.

• Analytical Science and Technology
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• v.27 no.2
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• pp.79-91
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• 2014

Solubility data of carbon dioxide ($CO_2$) in 1-butyl-3-methylpiperidinium bis(trifluoromethylsulfonyl)imide ($[bmpip][Tf_2N]$) ionic liquid are presented at pressures up to about 30 MPa and at temperatures between 303 K and 343 K. As far as we know, the data on the $CO_2$ solubility in the $[bmpip][Tf_2N]$ ionic liquid have never been reported in the literature by other investigators. The solubilities of $CO_2$ were determined by measuring the bubble point or cloud point pressures of the $CO_2+[bmpip][Tf_2N]$ mixtures with various compositions using a high-pressure equilibrium apparatus equipped with a variable-volume view cell. To observe the effect of the cation composing the ionic liquid on the $CO_2$ solubility, the $CO_2$ solubilities in $[bmpip][Tf_2N]$ used in this study were compared with those in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide ($[bmim]Tf_2N]$). As the equilibrium pressure increased, the $CO_2$ solubility in $[bmpip][Tf_2N]$ increased sharply. On the other hand, the $CO_2$ solubility decreased with increasing temperature. The mole fraction-based $CO_2$ solubilities were almost the same for both $[bmpip][Tf_2N]$ and $[bmim][Tf_2N]$, regardless of temperature and pressure. The phase equilibrium data for the $CO_2+[bmpip][Tf_2N]$ systems have been correlated using the Peng-Robinson equation of state.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.36 no.2
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• pp.126-131
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• 2000

Capability and performance of the pliers type coupling device for connection of sea eel pots to loop of main line and automatic separating system were investigated at sea as first trial of developing automatic operating system for sea eel pot fishing boat. Obtained main results are as follows. 1. Maximum tensile load of the pliers type coupling device when connection with high twist PP dan-line as a loop of main line was 1603 N, higher than when connection with low twist PP twine 1379 N. 2. A retention ratio of sea eel pots from main line by connecting with coupling device was successful 100% with high performance without any loss in the sea. 3. A ratio of automatic disconnection between sea eel pots using coupling device and loop of main line was perfect 100% without any trouble.

• Proceedings of the Membrane Society of Korea Conference
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• 1993.10a
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• pp.75-76
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• 1993

자연수에는 무기이온, 용해유기물, 미립자, 미생물과 같은 성분들이 혼재되어 있다. 일반실험실에서 사용하는 증류수, RO수 또는 이온교환수는 실험용 기구 세척수, 일반 정성화학 실험 등에는 적당하지만, 최근 급속히 발전하는 생명공학의 조직배양용이나 PHLC, AAS, 이온크로마토그래피 등 정밀분석기기 용수로는 부적당하다.

• Information Display
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• v.18 no.2
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• pp.20-26
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• 2017

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2011.10a
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• pp.245-246
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• 2011

• Analytical Science and Technology
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• v.14 no.4
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• pp.317-323
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• 2001

Dissolution procedures of Monsanto catalyst which has been used to produce acrylronitrile by ammoxidation of propylene have been studied. Optimum dissolution condition of the catalyst supported on silica was obtained by microwave digestion system with mixed of HCl, HF and $H_2O_2$. When a safety device was activated by increased pressure in microwave vessel, Bi, Fe, Mo, Sb and U were not volatilized even though silica was volatilized as $SiF_4$. Quantification results by this method were $SiO_2$ $50.5{\pm}0.4%$, $Sb_2O_3$ $29.6{\pm}0.6%$, $UO_2$ $10.2{\pm}0.1%$, $Fe_2O_3$ $6.1{\pm}0.1%$, $MoO_3$ $0.73{\pm}0.01%$ and $Bi_2O_3$ $0.49{\pm}0.01%$ by ICP-AES and the relative error was within ${\pm}10%$ except bismuth.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.538-538
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• 2012

전북대학교 고온 플라즈마 응용 연구 센터는 교육과학기술부 기초연구사업 중 고가연구장비 구축사업의 일환으로 고부가가치 재료 연구 및 시험생산이 가능한 소재공정용 200kW ICP(RF) 플라즈마 발생장치를 구축하고 있다. 200 kW급 ICP (RF)형 플라즈마 발생장치는 수~수십 um 크기의 금속, 세라믹 등 고융점 원료분말 등을 수~수십 um 크기의 금속, 세라믹 등 고융점 원료 분말을 순간적으로 용해, 기화 및 분해시키고 이들 기화 또는 분해된 증기를 급랭시키는 과정에서 대량으로 초미분($<1{\mu}m$)을 합성하는 RF 플라즈마 분말 합성 시스템으로 시간당 1 kg 이상의 나노 분말의 제조가 가능하도록 설계 제작된 생산 지원용 대형 ICP(RF) 플라즈마 장치이다.