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trans-Dinitrogen bis-1,2-bis(Diphenylphosphino) Ethane Molybdenum(O)을 촉매로 Olefin에의 수소전이에 있어서 용매효과
박무순 순천향대학교 1989 논문집 Vol.12 No.2
Hydrogen transfer from organic compounds to olefins, which is called transfer hydrogenation, was studied to find effective homogeneous catalysts and it was found that trans-Mo(N₂)₂(DPPE)₂[DPPE = Ph₂PCH₂CH₂PPh₂] had the highest catalytic activity among the zerovalent complexes which were tried. This paper reports on investigation of the hydrogen donating ability of various organic compounds catalyzed by trans-Mo(N₂)₂(DPPE)₂. The most effective hydrogen donor is found to be 2-propanol among the organic compound examined. In the hydrogen transfer reaction of 2-propanol-tetrahydrofuran systems, the yield of hydrogenation product is remarkably incleased.
국산 티타늄철광으로부터 이산화티타늄의 제조에 관한 연구
朴鍾會,金演斗,朴茂淳 충남대학교 자연과학연구소 1975 學術硏究誌 Vol.2 No.1
It has been observed that Titanium(Ⅳ) is not precipitated in the presence of hydrogen peroxide in ammonia water, while Iron(Ⅲ) and Aluminum(Ⅲ) are precipitated as hydrated oxide. Thus it is shown that the quantitative separation of Titanium(Ⅳ) from Iron(Ⅲ) and Aluminum(Ⅲ) in Ilmenite solution is possible by using ammoniacal hydrogen peroxide. However in case of the presence of a large amount of Iron(Ⅲ), it is necessary to eliminate most of the Iron(Ⅲ) in 10N hydrochloric acid solution by extraction with Amberlite LA-1-xylene mixture prior to the conversion of the acid solution to alkali solution. Upon heating the solution, due to the dissociation of hydrogen peroxide, it is easy to obtain Titanium hydroxide which directly gives Titanium dioxide by ignition for an hour at 900~1,000℃. According to the above method of preparation, production of Titanium dioxide from the Ilmenite ores is yielded about 81%.
Eethyl benezylidencyanoacetate 유도체에 대한 thiophenol 첨가 반응의 속도론적 연구
朴茂淳,金文執,崔元植,黃善岩,孟柱煬 순천향대학교 1991 논문집 Vol.14 No.1
Reaction of benzaldehyde derivatives with ethylacetate afforded ethylbenzylidenecyanoacetate. Especially, the crystal structure of ethyl p-methoxybenzylidenecyanoacetate were demonstrated by X-ray diffrection method. The crystal structure is only exist in E-form. The kinetic studies on the mechanism of nucleophilic addition of thiophenol to ethyl benzylidenecyanoacetate have been investigated by UV-spectrophotomery and the rate equation which can be applied over wide pH range was obtained. From the rate equation, effect of generalbase and substituent, the fellowing reaction proposed. Below pH 3.0, thiophenol added to the double bond, while above pH9.0 thiophenoxide ion added to the double bond. In the range of pH from 3.0 to 9.0, these reaction occurred competitively.
顎關節障碍患者에 있어서 下顎顆頭의 骨變化樣狀에 關한 放射線學的 硏究
朴茂洵,劉東洙 大韓口腔顎顔面 放射線學會 1989 Imaging Science in Dentistry Vol.19 No.1
The author has studied radiographic bony changes of mandibular condyle head in temporomandibular disorder patients using Oblique lateral transcranial projection, Orthopantomogrphy, and Tomography. The bony change types and the frequencies of occurrence and the incidences of bony changes in three different radiographic techniques were examined. The coincidences of bony change types between the Oblique lateral transcranial projection and the lateral part of Tomogram, the Orthopantomogram and the medial part of Tomogram were also examined. The results were as follows: 1. The mean age of patients was 31.7 years and under 40 years were 24 patients, women were 27 patients, men were 4 patients. 2. The observable cases of bony changes in all three radiographic techniques were 19 cases (50%) of 38 cases and the observable cases of bony changes in only Tomography were 5 cases (13.2%). 3. The most frequent radiographic bony change type was osteophyte and next orders were flattening, erosion, concavity. 4. The positional incidences of bony change in Tomogram were 31 cases in lateral part and 27 cases in central part. 5. The coincidence of bony change types between the Oblique lateral transcranial projection and the lateral part of Tomogram was 80%, and the coincidence between the Orthopantomogram and the medial part of Tomogram was 76.9%.
朴鍾會,申大鉉,尹錫丞,朴茂淳,李弘 충남대학교 기초과학연구소 1986 연구논문집 Vol.6 No.-
전해질 고분자인 polyvinylsulfate(PVS) 및 polystyrenesulfonate(PSS) 존재하에서 나타나는 methylene blue(MB) 및 acridine orange(AO)의 metachromasy 현상을 각각 분광학적 방법으로 연구하였다 P/D 값의 변화에 따르는 meta-band의 특성적 변화는 stacking 이론에 의하여 설명하였으며 PVS-dye계의 stacking 효과는 PSS-dye계의 그것보다 더 강하였고 MB가 AO보다 더 강한 stacking 효과를 나타냄을 발견하였다. 전에 제안한바 있는 평면구조의 방향색소들이 수용액속에서 형성하는 dimer의 모형과 dimension을 근거로 고분자사슬 표면에 결합되어 있는 색소분자들의 stacking 모형을 제안하였으며 이 모형은 여러 연구자들에 의하여 밝혀진 실험적 결과와 비교 검토한 결과 합리적임이 발견되었다. Spectroscopic studies have been carried out on the metachromatic behavior of methylene blue(MB) and acridine orange(AO) in the prescence of polyvinylsulfate(PVS) and polystyrenesulfonate(PSS). The characteristic changes of meta-band with the change of P/D value are discussed in terms of stacking theory. It has been found that the stacking effect in the PVS-dye system is stroger than that in the PSS-dye system and that MB shows stronger stacking effect than AO. A stacking model and dimension of bound dyes on the surface of polymer chain is proposed on the basis of the previously suggested model of dimer found in the aqueous solution of planar aromatic dyes. The proposed model is found to be reasonable in accordance with the experimental results obtained by various workers.
Methylene Blue의 분자회합에 미치는 용매효과
박종회,박무순,박희억,서성원 충남대학교 1985 忠南科學硏究誌 Vol.12 No.2
A typical metachromatic dye, methylene blue(MB), has been found not to associate in ethanol, ethylene glycol, glycerol and 80 wt.% dioxane. The absorption spectra observed in the various kind of organic solvents are in good agreement with the calculated monomer spectra in both the shape and the absorption intensity. These results suggest that the water molecules play an important role in self-association of the dye molecules in aqueous solution. In this study, the changes in intensity and frequency shift of absorption spectra of MB are observed in the mixtures of water and organic solvents with the change in wt.% organic solvent. The discussions are made both upon the change in intensity and the frequency shift. The intensity changes are attributed to the change in the degree of association and the frequency shift is explained in terms of the interaction between the energy states of the MB molecules and the solvent polarity.
朴茂淳,孫炳贊,金演斗 순천향의과대학 1978 Journal of Soonchunhyang Medical Science Vol.1 No.1
It has been observed that Pt(IV) in Hydrochloric acid solution, when treated with Tin(II) chloride give a orange color and the color that is due to chloroplatin-ous acid, is stable reproducible and quantitative. Thus it is possible to determine platinum by use of spectrophotometer. This method saves time in determination of Pt and is applied to estimation of small amounts of Pt in its ores and alloys.