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trans-Fluoroaquobis (ethylendiamine) Chromate(III) Cation 수화반응 속도에 대한 온도와 압력의 영향
吳相牛,李相協,林鍾完 慶北大學校 物理化學硏究所 1986 硏究論文集 Vol.7 No.-
착물 trans-〔Cr(en)_2F(H_2O)〕^2+의 hydrolysis에 대한 속도상수를 분광광도법으로 여러가지 온도와 압력에서 측정하였다. 온도 범위는 30℃에서 50℃까지이고 압력은 1 bar에서 1500bar까지 변화시켰다. 1bar, 30℃에서 측정된 속도상수는 2.632×10 exp(-5)sec^-1였다. 속도상수는 일정온도에서 압력이 증가함에 따라 감소하였다. 활성화 부피와 다른 활성화 파라미터들은 이러한 속도상수로 부터 계산되었다. 활성화 부피는 모두 양의값을 가졌으며 0.477에서 3.152㎤/mol내에 있고, 활성화 엔트로피는 작은 값을 가진다. 이 반응은 흡열반응이고, 실험적인 온도에서 엔탈피 지배반응이다. The rates of hydrolysis of the complex, trans-〔Cr(en)_2F(H_2O)〕2^-1, have been investigated using spectrophotometric method at various temperatures and pressure. Temperature was 30℃ to 50℃ and pressure was varied up to 1500bar. The rate constant measured at 30℃ is 2.632×10 exp(-5)sec^-1. The rate constants are decrease with increasing pressure at constants temperature. Activation volume and other activation parameters are calculated from these rate constants. The activation volumes are all positive and lie in the limited range 0.447∼3.152㎤/mol and the activation entropies are small values. From the results, it was found that this reaction was endothermic and enthalpy controlled reaction in the experimental temperature.
Co(Ⅱ) Tetraphenylporphrin의 Ligand 添加反應에 對한 反應速度論的 硏究
李相協,呂煥鎭,吳京姬 경북대학교 과학교육연구소 1987 科學敎育硏究誌 Vol.11 No.-
The reaction of Imidazole, Pyridine, Lutidine and Methylamine with Co(TPP), where TPP is tetraphenylporphyrin are investigated in the temperature range between 25℃ and 40℃ by measuring the visible absorption spectra of a series of solution in which solvent is varied. Solvents which is used are Tetrahydrofuran, N-N dimethylforamide and Methanol. As solvent is varied, coordination number of complex is changed. In THF solvent, hexacoordinated to Co-porphyrin species of the type Co(TPP)L_2 are dominant. But when Lutidine is coordinated to Co(TPP), five-coordinated Co-porphyrin is dominant. In this study, solvent effect and ligand effect is considered.
조병하,이상렵,이순탁,함능수,나인엽,오창언,김자홍 경북대학교 1971 生産技術 Vol.5 No.-
This study is a "reconnaissance" of "preliminary" grade survery with the objectives of compiling and analyzing drainage systems, river pollution, hydraulic and hydrologic characteristics of sewage, and conservation of public water supplies for design of sewer systems in Taegu. In addition, it contains basis information for design of new sanitary sewage and drainage systems for Taegu. The results are shown as follows;1) Before attempting to design a sewage system, it was necessary to set up reliable standards for estinating sewage amounts. 2) The results of analysis and examination of Taegu's drainage systems. 3) The investigation of "sewage quality and river pollution in Taegu. 4) In order to maintain the B.O.D. value of the Kumho River below 8 ppm, a sewage treatment plant will be necessary. The basic information necessary in planning a treatment plant is given. This study is a summary of reseach that was conducted jointly by Kyung-Pook National Univ ersity's Insttute of Industrial Sciences and Young-Nam Universty's Institute of Industrial Sciences and Young-Nam University's Department of Civil Engineering. The study was begun on Novemver 4,1969 and completed on November 3,1970. By an agreement between the United States Agency for International Development and the Ministry of Science and Technology of the Republic of Korea, the work was financial out of the MO ST/USAID Trust Fnnd.
오태협,이한욱,박성직,박재우,Oh, Tae Hyup,Lee, Hanuk,Park, Sung Jik,Park, Jae-Woo 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.1
Fenton is the reaction using the OH· radicals generating by interaction between hydrogen peroxide and Fe<sup>2+</sup> which can oxidize the contaminants. Fe<sup>2+</sup> ions are oxidized to Fe<sup>3+</sup> ions by reaction with H<sub>2</sub>O<sub>2</sub> and formed OH· radicals. UV-Fenton process includes the additional reaction that generates the OH· radicals by photodegradation of H<sub>2</sub>O<sub>2</sub>. In methylorange (MO) decolourization experiment with UV-Fenton, optimal Fe<sup>2+</sup>: H<sub>2</sub>O<sub>2</sub> ratio was obtained at 1 : 10. Based on the obtained condition (H<sub>2</sub>O<sub>2</sub>= 10mM, Fe<sup>2+</sup> = 1 mM) with/without UV-fenton experiment was carried out. Removal efficiency and sludge production were measured at 30 min. The case of w/o UV irradiation and only H<sub>2</sub>O<sub>2</sub> was hardly treated and only Fe<sup>2+</sup> showed 65% removal owing to coagulation. When UV-Fenton process in optimal ratio (Fe<sup>2+</sup>: H<sub>2</sub>O<sub>2</sub> = 1 : 10), UV irradiation showed better removal efficiency than of w/o UV irradiation. Also, MO decolourization was a function of the hydrogen peroxide concentration (x<sub>1</sub>), Fe<sup>2+</sup>:H<sub>2</sub>O<sub>2</sub> ratio (x<sub>2</sub>), and numbers of UV lamp (x<sub>3</sub>) from the application of the response surface methodology. Statistical results showed the order of significance of the independent variables to be hydrogen peroxide concentration > numbers of UV l amp > Fe<sup>2+</sup>: H<sub>2</sub>O<sub>2</sub> ratio.
Polyethyleneimine-Cr(Ⅲ) 착(錯)물(物)의 분광학적(分光學的) 특성(特性) 및 과산화소(過酸化水素) 분해반응(分解反應) 촉매(觸媒)활성도(活性度)
박상오 ( Sang Oh Park ),박정학 ( Jung Hag Park ),이상협 ( Sang Hyup Lee ) 경북대학교 과학교육연구소 1982 科學敎育硏究誌 Vol.6 No.-
Cr (Ⅲ) comp lexes with polyethyleneimine as l i gand were prepared in absolute ethanol by varying PEI/Cr(Ⅲ) mole ratio and temperature. The effects of PEI/Cr(Ⅲ) mole ratio and reaction temperature on the yield of the resulting complexes were investigated.[Cr(PEI)]Cl3, [Cr(PEI)]2(so4)3 and [Cr(PEI)] (C2H3O2)3 were insoluble in most of organic solvent but very soluble in H2O. The structures of PEI-Cr(Ⅲ) complexes were characterized by means of infrared and visible spectroscopy. Catalytic activities of the complexes on the decomposition reaction of hydrogen peroxide wire investigated and it was found that catalytic activities decrease in the following order: [Cr(PEI)]CI 3>[Cr(PEI)]2(SO4)3>[Cr(PEI)] (C2H3O2)3> [Cr(en)3]I 3> [Cr(en)3]Br3> [Cr(en)3]CI 3 □ 0. On the basis of structural analysis by means of visible and infrared spectroscopy, the catalytic activity of Cr(Ⅲ) complexex is assumed to depend on the bond strength of Cr(Ⅲ) and ligand.
농식품 환경 분야(PF) : PF-13 ; 두 지역에서 재배된 배 중 Fenitrothion과 Myclobutanil의 잔류 패턴
전상오 ( Sang Oh Jeon ),황정인 ( Jeong In Hwang ),전영환 ( Young Hwan Jeon ),이상협 ( Sang Hyup Lee ),김장억 ( Jang Eok Kim ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
It is important to investigate biological half-lives (t1/2) of pesticides for predicting their residual amounts at harvest time. In this study, dissipation patterns of fenitrothion and myclobutanil were studied in two pear orchards, Yeongcheon (YC) and Gyungju (GJ), and pre-harvest residue limits (PHRLs) for the pesticides in pears were calculated using their half-lives. The residual amount of fenitrothion in YC pear at the harvest time slightly exceeded its maximum residue limits (MRLs) which is 0.20 mg/kg, whereas that in GJ pear was below MRLs. In case of myclobutanil, the residual amounts were below MRLs in pears of both regions. The dissipation constants of fenitrothion in YC and GJ pears were 0.055 (t1/2 = 12.6 days) and 0.040 (t1/2 = 17.3 days), respectively, and those of myclobutanil were 0.025 (t1/2 = 12.6 days) and 0.097 (t1/2 = 17.3 days), respectively. According to the calculated PHRLs, if the residual amounts of fenitrothion and myclobutanil in pears were 0.48~0.67 mg/kg and 1.20~ 1.69 mg/kg, respectively, at 10 days prior to the harvest, their residue amounts in pears at the harvest time would be below the MRLs.
Sang-Hyup Lee,Seunguk Oh,Young-Guk Ko,Yong-Joon Lee,Seung-Jun Lee,Sung-Jin Hong,Chul-Min Ahn,Jung-Sun Kim,Byeong-Keuk Kim,Kyu-Yong Ko,Iksung Cho,Chi Young Shim,Geu-Ru Hong,Donghoon Choi,Myeong-Ki Hong 대한심장학회 2024 Korean Circulation Journal Vol.54 No.2
Background and Objectives: Evidence regarding the efficacy and safety of intracardiac echocardiography (ICE) for guidance during transcatheter aortic valve replacement (TAVR) is limited. This study aimed to compare the clinical efficacy and safety of ICE versus transesophageal echocardiography (TEE) for guiding TAVR. Methods: This prospective cohort study included patients who underwent TAVR from August 18, 2015, to June 31, 2021. Eligible patients were stratified by echocardiographic modality (ICE or TEE) and anesthesia mode (monitored anesthesia care [MAC] or general anesthesia [GA]). Primary outcome was the 1-year composite of all-cause mortality, rehospitalization for cardiovascular cause, or stroke, according to the Valve Academic Research Consortium-3 (VARC-3) definition. Propensity score matching was performed, and study outcomes were analyzed for the matched cohorts. Results: Of the 359 eligible patients, 120 patients were matched for the ICE-MAC and TEE-GA groups, respectively. The incidence of primary outcome was similar between matched groups (18.3% vs. 20.0%; adjusted hazard ratio, 0.94; 95% confidence interval [CI], 0.53–1.68; p=0.843). ICE-MAC and TEE-GA also had similar incidences of moderate-to-severe paravalvular regurgitation (PVR) (4.2% vs. 5.0%; adjusted odds ratio, 0.83; 95% CI, 0.23–2.82; p=0.758), new permanent pacemaker implantation, and VARC-3 types 2–4 bleeding. Conclusions: ICE was comparable to TEE for guidance during TAVR for the composite clinical efficacy outcome, with similar incidences of moderate-to-severe PVR, new permanent pacemaker implantation, and major bleeding. These results suggest that ICE could be a safe and effective alternative echocardiographic modality to TEE for guiding TAVR.