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      • r-Fe₂O₃소결체의 가스감지 특성

        梁千會 大田工業大學 1989 한밭대학교 논문집 Vol.6 No.2

        ABSTRACT Gas Sensing materials for detecting of inflammable gases such as iso-butane were developed by Fea 04 as the principal sensing material. The redox reaction between y-FezOa and Fe3-.r04 at the surfaces ofy-FeaOa particles is responsible for the change of resitivity of their -Fea Oa sensor and the gas sensitivity depended on the crystal structure. Gas Sensing materials for detecting of inflammable gases such as iso-butane were developed by Fe_3O_4 as the principal sensing material. The redox reaction between γ-Fe_2O_3 and Fe_(3-χ)O_4 at the surfaces of γ-Fe_2O_3 particles is responsible for the change of resitivity ofγ-Fe_2O_3 sensor and the gas sensitivity depended on the crystal structure.

      • 산화법에 의한 N-치환 히드라존의 합성

        이기창,권순자,양천회 明知大學校 産業技術硏究所 1983 産業技術硏究所論文集 Vol.2 No.-

        In acetone-ammonia system with amines, N-Substituted hydrazone was synthesized by the oxidation of hydrogenperoxide. The results are as follows : 1. The yield of phenylhydrazone was increased and that of azone decreawed with increasing the aniline added. 2. The excess of aniline was unfarorable for preparation of both azine and hydrazone. 3. Similar behavior was observed for t-butylamine to afford acetone t-butylhydrazone and azine, while cyclohexylamine resulted in the exclusive formation of 2-cyclohexyl-3, 3-dimethyloxaziridine.

      • KCI등재

        농공단지 조성에 따른 하천 수질관리 대책에 관한 연구 : 충청남도 지역을 중심으로 Centering around Area of Chung Chong Nam Do

        양천회 한국산업안전학회 1994 한국안전학회지 Vol.9 No.1

        A study of stream pollution caused by construction of the Industrial Complex in Agricultural Area of Chung Chong Nam Do were descrived here. The five main results of this studies are summerized. First, since 1988, among the companies moved in the industrial complex area, the number of electric and electronic companies have increased compared with food companies requiring much BOD. This is very desirable to reduce the water pollution. Second, the average Biochemical Oxygen Demand(BOD) of Masan stream was the highest and it was decreased in the order of Yudug, Jo and Jungan stream. Third, although the concentration of heavy metals such as Cd and Cr^(6+) are not off the limit and the amount of it is small, it is desirable to introduce a chemical process to remove these metals. Fourth, since the wastewater from industrial complex area is the major factor in stream pollution, the laws associated with environmental protection should be enforced even then if the industrial complex area with food and chemical companies produce wastewater less than 500ton/day. Fifth, it is required to improve a facilities which separete living wastewater from inderstrial wastewater in Kaya-gok and Nojang industrial complex areas.

      • KCI등재

        졸-겔공정에 의해 Polymethylmethacrylate 위에 실리카 코팅

        양천회,이상근 한국산업안전학회 1997 한국안전학회지 Vol.12 No.4

        In order to improve the surface characteristics of polymethylmethacrylate(PMMA), oxide thin film coatings were applied using the sol-gel dip-coating technique. The Si(OC₂H_5)₄, tetraethyl-ortho-silicate(TEOS) was used as a starting material for SiO₂ coating. The hardness of the alkoxy-derived oxide-coated PMMA was increased from 190 MPa for non-coated PMMA with increasing film thickness. By optimizing the heating conditions and the hydrolysis conditions, a maximum apparent hardness obtained in the present study was achieved 310 MPa using the withdrawal velocity of 5㎝/min and heat treatment at 90℃ for 5 hours, which is about 1.6 times larger than that of uncoated PMMA.

      • Titania 광촉매에 의한 페놀의 광분해

        양천회,홍필선 大田産業大學校 1999 한밭대학교 논문집 Vol.16 No.1

        TiO_2 and x TiO_2-y SiO_2 system photocatalysts were developed by sol-gel method based on the change of production parameters, and their structure of crystallization and the specific surface area was measured. Considering the efficiency of the phenol degradation using the catalyst, the conclusion were obtained as follows: By means of X-ray analysis of TiO_2 powder that is obtained from H_2O/Titanium alkoxide with various molar ratios, it is shown that crystal structure of anatase type is a dominating structure and, on the other hand, the structure of rutile also partly exists. The specific surface area is at its maximum value at R=6, which is the molar ratio of water vs. alkoxide, whereas its value goes down as the molar ratio increases. TiO_2-SiO_2 mixed compound photocatalysts were developed from Titanium and Silicon alkoxide by a hetero-condensation process. The increase of SiO_2 contents causes the decrease of the degree of crystallization of the gel, whereas the specific surface area preferentially increases. The maximum degradation rate of phenol is shown in 60 TiO_2-40SiO_2 catalyst.

      • KCI등재

        졸 겔법에 의한 TiO2 - SiO2 합성 및 광촉매활성

        양천회,류완호 한국산업안전학회 1999 한국안전학회지 Vol.14 No.1

        TiO₂ and xTiO₂-ySiO₂ system photocatalysts were developed by sol-gel method based on the change of production parameters, and their structure of crystallization and the specific surface area was measured. Considering the efficiency of the ethanol decomposition using the catalyst, the conclusion was made as follows: 1) By means of X-ray analysis of TiO₂ powder that is obtained from water and Titanium alkoxide with various molar ratios, it is shown that structure of crystallization is a dominating structure and, on the other hand, the crystallization of rutile also partly exists. The specific surface area is at its maximum value at R=6, which is the molar ratio of water vs. alkoxide, whereas its value goes down as the molar ratio increases. In the reaction of using TiO₂ catalyst, the ethanol is decomposed into the extent of 15∼30%r in an hour and three hours are necessitated for 70% decomposition. 2) TiO₂/SiO₂ powder is developed from Titanium and Silicon alkoxide by a hetero-condensation process. The increase of SiO₂ contents causes the decrease of the degree of crystallization of the gel, whereas the specific surface area preferentially increases. In the decomposition inaction of the ethanol, the decomposition efficiency represents 25∼60% in an hour. It is, however, examined that the efficiency inactively increases corresponding to the duration of reaction time. It is shown that more than 90% of ethanol is decomposed when reaction time is about three hours and the efficiency illustrates the maximum value for 60-TiO₂/40-SiO₂ catalyst.

      • 폐광 광재와 유출수가 주변 토양과 하천오염에 미치는 영향

        양천회,고장석 大田産業大學校 1998 한밭대학교 논문집 Vol.15 No.1

        This study was investigated the extent of heavy metal contamination in areas of the soil and river by the effluent and abandoned mines in Chung Chong Nam Do. The abandoned mines were Gubong gold mine and Sinsung coal mine. The results were as follows. The concentrations of As and Pb in Gubong mine were 309.2mg/kg and 1163.5mg/kg which is above the soil quality standard. Cd concentration also was 14.70mg/kg which is exceeded warning level. The heavy metal contaminations in the vicinal paddy and dry field soil area were higher than those in coal mine area. However, As concentration was 29.29mg/kg which is exceeded the warning level as of 10.22mg/kg. The river water quality detected shows high Pb, As and Cd in Gubong stream and Cd, Cu and Pb in Sungju stream.

      • KCI등재

        졸-겔법으로 제조된 $TiO_2$촉매에 의한 합성세제의 광분해

        양천회,홍필선 한국안전학회 2001 한국안전학회지 Vol.16 No.3

        An aqueous solution of a commercial liquid synthetic detergent for kitchen use was photodecomposed in the presence of titanium dioxides ponder under an atmosphere of air at room temperature. Titanium dioxides were prepared by sol-gel method from titanium iso-propoxide at different R R ratio($H_2O$/titanium iso-propoxide) and calcined at $500^{\circ}C$. All titanium dioxides m characterized by XRD, BET surface area analyzer and UV-VIS spectrometer. The surface mea of titanium dioxides prepared at R ratio=6 appeared higher volume about 20% than commercial $TiO_2$ catalyses. XRD patterns of titania particles were observed mixing phase together with rutile and anatase type. Titanium dioxides prepared by sol-gel method show higher activity about 6% than commercial $TiO_2$ catalysts on the Photocatalytic foundation of a commercial liquid synthetic detergent for kitchen. The concentration of the detergent decreased to about 90%, of its initial value at illumination times of 2 hour. illumination for 30 minutes decreased the concentration of oxygen to about one-fifth of the initial value.

      • KCI등재후보

        공정변수를 조절한 폴리에틸렌 산화왁스 합성에 관한 연구

        양천회 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.2

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Oxidized polyethylene wax is obtained by oxidation of polyethylene wax and it is composed of various chemicals, e.g., fatty acid, alcohol, ketone and ester. The application of oxidized polyethylene wax is determined by the composition of these chemical substances. In this basic study we observed the basic reaction parameters of time, temperature, oxygen concentration and catalysts on the oxidation reaction of low molecular weight polyethylene(PE wax) by analyzing the acid value, physical and chemical properties of oxidized PE wax to develop a new oxidation process. Acid values are increased with temperature increase in the rage of 150℃~180℃ but decreased beyond 190℃. Acid values are also increased with oxygen concentration. As the oxidation reaction proceeds the molecular weight and softening points of oxidation products are decreased by cracking reaction, but the viscosities are increased. To observe the crystallinity of oxidation products SEM experiment was performed. To obtain a high acid-value product in a mild condition, we adopted free radical catalysts and the acid value of the product using catalyst was higher than the product obtained without catalyst in the same reaction condition. The effective initiators were dicumyl peroxide(DCPO), t-butylperoxy-2-ethyl hexanoate(HOPO) and benzoyl peroxide(BPO) having long half-life.

      • 저밀도 폴리에틸렌 왁스의 산화공정에 관한 연구

        양천회,이동진 한밭대학교 2003 한밭대학교 논문집 Vol.20 No.-

        In this basic study we observed the basic reaction parameters such as time, temperature, oxygen concentration and catalysts in the oxidation reaction of low molecular weight polyethylene(PE) wax by analyzing the acid value, physical and chemical properties of oxidized PE wax to develop a new oxidation process. The purpose of this study was developing a manufacturing and acid-value-controlling technology of oxidized polyethylene waxes by observing the effect of the reaction parameters on the acid value in the oxidation reaction of low molecular weight polyethylene. Acid values were increased with temperature increase in the rage of 150℃ ~ 180℃, but decreased beyond 190℃. Acid values were also increased with oxygen concentration. As the oxidation reaction proceeds, the molecular weight and softening points of oxidation products were decreased by cracking reaction, but the viscosities were increased. We could observe that the size of crystallites were decreasing with the oxidation reaction progress. To obtain a high acid-value product in a mild condition, we adopted free radical catalysts and the acid value of the product using the catalysts was higher than the product obtained without the catalyst in the same reaction condition. The effective catalysts were DCPO(dicumyl peroxide), HOPO(t-butyl peroxy 2-ethyl hexanoate) and BPO(benzoyl peroxide) having long half-life.

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