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Slurry batch형 광화학 반응기를 이용한 폐수 내의 Trichlroethyene 의 분해
이태규(Tai K Lee),김동형(Dong H. Kim),조서현(Sug H. Cho),오정무(Chungmoo Auh) 한국태양에너지학회 1992 한국태양에너지학회 논문집 Vol.12 No.3
본 실험에서는 산업폐수, 가정폐수, 지하수 등에 오염되는 유독성 유기물 처리를 위한 태양반응시스템의 개발을 목적으로 batch형 광분해 반응시스템을 구성하여 수처리 분해실험을 실시하였다. 실험실 규모의 batch형 반응기를 구성하여 수질 개선용 광화학 반응 활용의 기술적 타당성을 확보하고자 하였으며 다음과 같은 결론을 얻을수 있었다. (1) TiO₂ anatase, TiO₂ rutile 그리고 V₂O_5를 대상으로 광촉매 선정을 위한 실험결과, 본 실험조건에서는 band gap energy가 약 3.2eV인 TiO₂ anatase가 유해 유기물 TCE의 가장 높은 분해율을 나타내었다. TiO₂ anatase의 결정구조는 XRD 관찰에 의하여 확인할 수 있었으며, BET-N₂ 측정결과 단위무게당 표면적은 약 7.748 ㎡/g 이었다. (2) TiO₂ anatase의 투입량이 많을수록 TCE분해율도 증가하였다. 그러나 투입량이 0.1wt%이상이 될 경우 분해율의 증진은 아주 미미하여서 0.1wt%의 TiO₂ anatase양을 slurry batch형 시스템 실험에 최선으로 채택하였다. (3) H₂O₂의 양이 TCE 분해율에 미치는 영향을 조사한 결과 적정량은 약 0.06 volume% 임을 알 수 있었다. 이는 적정량의 H₂O₂는 OH radical의 형성을 촉진시키지만 과량의 존재시에는 오히려 OH radical과 반응하여 이를 소모하는 역효과를 나타내기 때문이다. (4) 광반응기의 head space를 변화시키면서 산소양의 TCE 분해율에 미치는 영향을 관찰한 결과 TCE 분해반응식의 이론적 stoichiometry로나 실험적으로나 산소양이 아주 중요한 변수임을 알수 있었다. In this experiment, photochemical reaction has been applied to destroy TCE in water phase. The main target of this work is to investigate the technical feasibility of large scale of solar detoxification reactor for water treatment The results have revealed that solar detoxification utilizing photon energy from the sun is the most attractive process to decompose organic toxins in water phase at room temperature. The detailed results from this work are as follows;<br/> (1) The highest conversion ratio of TCE was obtained by using TiO₂ annatase as a photocatalyst among TiO₂ anatase, TiO₂ rutile and V₂O_5 under the same experimental condition. The anatase crystal structure was confirmed with XRD analysis, and its surface area was 7.748 ㎡/g from the BET- N₂ measurement (2) 0.1 wt % of TiQ₂ anatase has been adopted as optimal quantity for batch slurry reactor at this experimental conditions.<br/> (3) The effect of hydrogen peroxide on the conversion of TCE was investigated. Its optimal quantity was 0.06 vol. % under this experimental conditions.<br/> (4) The effect of oxygen on the conversion of TCE also was studied by controlling the head space in photoreactor. Results indicated that sufficient amount of oxygen should be supplied to accomplish the highest conversion rate of TCE in water phase.
TiO 광촉매를 활용한 수용액 내의 유기물질의 광분해 반응
이태규(Tai K.Lee),김동형(Dong H.Kim),김경남(Kyung N.Kim),오정무(P.Chungmoo Auh) 한국태양에너지학회 1995 한국태양에너지학회 논문집 Vol.15 No.2
폐수내에 용해되어 있는 유동성 유기물질의 분해처리를 위한 태양반응기 실용화에 대한 기본 및 응용연구를 실시하였다. 광촉매로는 0.lwt%의 Degussa P25 titanium dioxide (TiO₂)를 사용하여 TCE, chloroform 그리고 CCl₄들의 단일성분은 물론 TCE-chloroform, TCE-phenol and TCE-benzene 등의 이성분계 수용액에 대한 실험을 실시하였다. 일차적으로 원액의 반응기로의 적정유량을 조사하였으며, 각 2차성분들이 TCE의 분해율에 미치는 영향을 관찰하였다. 본 실험 조건하에서 최적의 공급유속은 약 200㎤/min 이었으며, 각 2차 성분들은 공통적으로 TCE 분해율을 저하시키고 있으나 적절한 분해조건의 확보시 다성분계의 폐수처리에도 광분해반응의 처리는 기술적으로 타당함을 알 수 있었다. TCE-phenol의 이성분 용액의 경우 H₂O₂의 TCE 분해에 미치는 영향을 조사한 결과 0.06vol%의 H₂O₂의 첨가로 TCE의 분해율이 증가함을 알 수 있었다. We have summarised some important aspects of our recent basic and applied studies in the area of photocatalytic detoxification with Degussa P25 titanium dioxide (TiO₂) being the photocatalyst. Heterogeneousphotocatalytic decompositions of two components such as TCE-chloroform, TCE-phenol and TCE-benzene as well as single component organic, TCE, chloroform and CCl₄ were carried out to investigate the effect of additional compound on the TCE decomposition rate. In laboratory experiments, the optimum flow rate of TCE solution was 200cm3/min with annular photoreactor in the presence of 0.lwt% Ti O₂ powder under illumination. It was observed that the second compound such as CHCl₃, phenol and benzene has a negative effect on the TCE decomposition rate. Result presented that TCE decomposition ratio was increased at low pH in the TCE-phenol two component solution. It could be shown that the photocatalytic reactor exhibits technical feasibility of detoxifying the multicomponent under proper experimental conditions.
Anisotropic Pattern Transfer in GaN by Photo-Enhanced Wet Etching
H.Cho,S.C.Ryu,J.K.Kim,심광보,K.H.Auh,S.J.Pearton 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.3
Anisotropic pattern transfer in GaN (undoped and n-type) has been performed by UV photo-enhanced wet etching in KOH, NaOH and AZ400K solutions and a comparison of these electrolytic solutions is presented. The etch mechanism was found to be diffusion-limited (Ea <6 kCal·mol−1) under all conditions whose other characteristics were a square-root dependence of etch rate on time, the production of relatively rough surfaces with a strong dependence of rate on solution agitation, whilst significantly faster etch rates were obtained with bias applied to the sample during light exposure.
S.H.Seo,T.H.Lee,박진석,K.H.Auh 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.4
In this paper, we present experimental results regarding the growth of nitrogen-incorporated diamond films grown by employing a microwave plasma CVD method. For grown films, cathodoluminescence (CL) characteristics are examined in terms of growth conditions, such as gas mixture (N2/(CH4+H2)) ratio and microwave power. From the CL characteristics the relative intensity of the so called band-A (related to a dislocation, IA) centered at 430 nm to the nitrogen-related band (IN), which is composed of two peaks centered at 578 nm (related to a nitrogen-vacancy complex) and at 637 nm (related to a vacancy trapped at a substitutional nitrogen site). The effect of oxygen, which is added during diamond growth, on the CL property is also investigated. In addition, the Raman spectra, XRD patterns, and field-emission SEM morphologies are analyzed for all the films grown.
Orofacial complex regional pain syndrome: pathophysiologic mechanisms and functional MRI
Lee, Y.H.,Lee, K.M.,Kim, H.G.,Kang, S.K.,Auh, Q.S.,Hong, J.P.,Chun, Y.H. Elsevier 2017 Oral surgery, oral medicine, oral pathology and or Vol.124 No.2
Complex regional pain syndrome (CRPS) is one of the most challenging chronic pain conditions and is characterized by burning pain, allodynia, hyperalgesia, autonomic changes, trophic changes, edema, and functional loss involving mainly the extremities. Until recently, very few reports have been published concerning CRPS involving the orofacial area. We report on a 50-year-old female patient who presented with unbearable pain in all of her teeth and hypersensitivity of the facial skin. She also reported intractable pain in both extremities accompanied by temperature changes and orofacial pain that increased when the other pains were aggravated. In the case of CRPS with trigeminal neuropathic pain, protocols for proper diagnosis and prompt treatment have yet to be established in academia or in the clinical field. We performed functional magnetic resonance imaging for a thorough analysis of the cortical representation of the affected orofacial area immediately before and immediately after isolated light stimulus of the affected hand and foot and concluded that CRPS can be correlated with trigeminal neuropathy in the orofacial area. Furthermore, the patient was treated with carbamazepine administration and stellate ganglion block, which can result in a rapid improvement of pain in the trigeminal region.