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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.

      • 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.

      • 석탄회를 이용한 제올라이트의 합성과 폐수중의 암모니아성 질소(NH_4^+ -N) 흡착특성

        양천회,홍필선,류완호 한밭대학교 에너지청정기술연구소 2001 에너지청정기술논문집 Vol.1 No.1

        본 연구에서는 폐기되는 석탄회를 이용하여 제올라이트를 합성하고자 하였으며, 제조된 제올라이트를 이용하여 폐수 중에 포함된 암모니아성 질소를 제거하고자 하였다. 석탄회중에 포함된 미연소 탄소과 Fe_2O_3를 제거한 후 NaOH에 의한 수열합성 반응으로 제조하였다. 합성하는 과정에서 합성에 영향을 미치는 인자를 설정하여 이에 대한 최적 조건을 찾고자 전처리와 반응시간, 반응온도, pH의 영향에 대하여 조사하였다. 석탄회로 합성한 제올라이트의 성능평가를 위해 상업용 제올라이트인 3A, 4A, 5A, Y-type 제올라이트와 비교하였으며, 이때 합성 최적 조건은 4N-NaOH에서 4시간 합성한 제올라이트가 가장 우수한 성능을 나타내었다. 이는 암모니아성 질소의 흡착능이 80% 이상을 나타내었다. pH는 7∼9.5사이에서 우수한 흡착능을 나타내므로 합성시 석탄회를 산 처리하여 pH 조건을 맞추고자 하였다. In this study, some kinds of zeolite were synthesized from coal fly ash which was taken from domestic coal fired power plant, for the removal of NH_4^+-N in waste water and effective utilization of coal fly ash. Unburned carbon and Fe_2O_3 were removed from the coal fly ash and it was digested with NaOH before converted to zeolite. The NH_4^+-N removal efficiency of synthesized zeolite was affected on the concentration of NaOH and digestion time. The optimal concentration and digestion time of NaOH were 4N and 4h respectively. The NH_4^+-N removal efficiencies of the synthesized zeolite were similar to those of the commercial grade zeolite (3A, 4A, 5A, Y-type). It was necessary with HCI solution to improve the removal efficiency of NH_4^+-N to was the zeolite.

      • 졸-겔법으로 제조된 TiO_(2) 촉매에 의한 합성세제의 광분해

        양천회 한밭대학교 에너지청정기술연구소 2004 에너지청정기술논문집 Vol.4 No.1

        An aqueous solution of a commercial liquid synthetic detergent for kitchen use was photodecomposed in the presence of titanium dioxides powder under an atmosphere of air at room temperature. Titanium dioxides were prepared by sol-gel method from titanium iso-propoxide at different R ratio(H₂O/titanium iso-propoxide) and calcined at 500℃. All titanium dioxides were characterized by XRD, BET surface area analyzer and UV-VIS spectrometer. The surface area of titanium dioxides prepared at R ratio=6 appeared higher volume about 20% than commercial TiO₂ catalysts. 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 TiO₂ catalysts on the photocatalytic degradation 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.

      • 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.

      • 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.

      • 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.

      • KCI등재

        졸-겔법으로 제조된 xTiO₂-ySiO₂ 분말에 의한 유기물의 광분해

        양천회,이봉철 한국응용과학기술학회 2008 한국응용과학기술학회지 Vol.25 No.2

        xTiO₂-ySiO₂ system photocatalysts were developed by sol-gel method basedon the change of production parameters, and their structure of crystalization and the specific surface area were measured. Considering the efficiency of the ethanol and phenol degradation By means of X-ray analysis of xTiO₂-ySiO₂ powder that is obtained from Titanium and Silicon alkoxide by sol-gel proces, it is shown that crystal s tructure of anatase type is a dominating structure and, on the other hand, the structure of r utile also partly exists. 2 contents causes the decrease of the degre of crystalization of the gel, whereas the specific surface area preferentialy increases . It is shown that more than 90% of ethanol and phenol are degr aded when reaction time is about three and an hours, and the maximum degradation rate of ein 60TiO ₂-40SiO₂catalyst.

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