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      • KCI등재

        졸 - 겔법으로 제조된 TiO2 촉매에 의한 합성세제의 광분해

        홍필선,양천희 한국산업안전학회 2000 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 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 TiO₂catalysts. 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 inital value.

      • Long chain alkylamine과 Quaternary ammounium염에 의한 malanate용액으로부터 인디움과 우라니움의 추출

        홍필선 大田工業專門大學 1983 論文集 Vol.33 No.-

        1. Sec-amine, quaternary amine, pri·amine and ter-amine is used in extraction of amine and quaternary ammonium salt as solvent. 2. Indium and uranium is quantitavely extrarated by 4% Aliquat 336S and Amberlite LA-1 from malonic acid (0.0IM-0.001 M) buffer solution (pH 2.5-5.0) 3. Indium is stripped with 5M-Hcl and determined spedtrophotometrically with 4-(2-pyridylazo) resorcinol at 520mm. 4. Uranium is stripped from the organic phase with 0.0IM-NaOH and determined spectrephotometrically at 530mm as its complex with 4-(2-pyridylazo) resorcinol.

      • LaMnO₃의 CO가스 감지 특성에 미치는 SrO의 영향

        홍필선 大田産業大學校 1995 한밭대학교 논문집 Vol.12 No.1

        The La_(1-x)Sr_xMnO_3 compounds wers synthesized from the perovskite-type perovskite-type LaMnO_3 compound by the partial replacement of lantanium with strontium. The sensitivities on carbon monoxide were measured at various temperatures, respecticely. The electrical resistivities and catalytic activties were examined about there having an effect on the gas- sensing in company with the effect of addition of strontium.

      • Nb_2O_5를 添加한 TiO_2 燒結體의 電氣 傳導度

        洪弼善 大田開放大學 1984 論文集 Vol.1 No.-

        The effects of addition of Nb_2O_5 on rutile have been investigated by electrical measurements. The amount of additive and sintering temperatures affect greatly properties of sintered bodies. The specimens with small amount of Nb_2O_5 sintered at high temperatures show the inhibition of sintering and the increased electrical conductivity. These phenomena were explained in terms of the principle of controlled valency.

      • Perovskite형 La₁-xSrxMnO₃의 합성에 미치는 SrO의 영향

        홍필선 大田産業大學校 1995 한밭대학교 논문집 Vol.12 No.1

        The La_(1-x)Sr_xMnO_3 was synthesized LaMnO_3 compound by the partial replacement of lantanium with strontium. The analysis of the synthetic compound showed that it was perovskite type to x=0.8. And it also showed that as the amount of strontium increased, the lattice parameter decreased though it was expected to increase. I think that the result was because Mn^3+ was changed Mn^4+ which had smaller ionic radius.

      • Sensor 素材로서 질화 알루미늄에 대한 로듐의 첨가효과

        洪弼善 大田開放大學 1986 論文集 Vol.5 No.-

        A gas sensor was prepared by calcining rhodium nitrate supported on aluminium nitride at various temperatures in a N_2 stream. The sensitivity of the gas sensor increased linearly with CO gas concentration below 3000 ppm at 180℃ and 220℃, while addition of rhodium nitrate over 3 wt%, was not effective. The sensor calcined at 1000℃ was twice as sensitive as that calcined at 600℃. Rhodium nitrate decomposed to Rh_2O_3 at high temperature. The apparent porosity of the gas sensor was about 50% and this value was kept constant after annealing. It is considered that aluminium nitride is a good material as a support.

      • 상수처리에 있어 이산화염소의 효과에 관한 연구

        홍필선,박영구 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.1

        ABSTRACTThe chlorine has been used as one of the drinking water supply system, it be used universally the most economic chemical treatment and effect chemical threatment.But, in chlorine treatment, the residual chlorine in drinking water reacts with organic materials (humic substances), and to produce THMs(trihalomethanes) which is known as carcinogenic substance.In the experiment, sample of drinking water was mixed that chlorine used in the original disinfectants were summaried as be more effect then the above single treatment (chlorine) dissolved oxygen, KMnO4 consume degree, and ferric, phenol, general bacteria, trihalomethanes. The chlorine has been used as one of the drinking water supply system, it be used universally the most economic chemical treatment and effect chemical threatment. But, in chlorine treatment, the residual chlorine in drinking water reacts with organic materials (humic substances), and to produce THMs(trihalomethanes) which is known as carcinogenic substance. In the experiment, sample of drinking water was mixed that chlorine used in the original disinfectants were summaried as be more effect then the above single treatment(chlorine) dissolved oxygen, KMnO_4 consume degree, and ferric, phenol, general bacteria, trihalomethanes.

      • KCI등재

        금속염을 함침한 TiO₂ 소결체의 전기 비저항 - 온도 특성

        홍필선(Hong Phil Sun),양천희(Cheon Hoi Yang) 대한공업교육학회 1985 대한공업교육학회지 Vol.10 No.1

        Titanium oxide sintered in air at 1000℃ for 2 hours was impregnated with several kinds of metallic salts in aqueous solution. The electrical resistivity of sintered bodies was measured as a function of the temperature by electrical multimeter. When the resistivity of specimen doped antimony was measured in air during the heating, two step extrema was observed. The first extrema in the low temperature was explained in terms of the desorption of the chemisorbed oxygen and oxidation, and the second extrema in the high temperature was by the precipitation of Sb₂O₃. In case of specimen doped Aluminum, the extrema was not appeared but the thermal hysteresis was done. These phenomena were explained in terms of the principle of controlled valency.

      • KCI등재

        MgO-Cr2O3-TiO2 산화물의 가스감지 특성

        양천회,홍필선,유일증,임병오 한국산업안전학회 1986 한국안전학회지 Vol.1 No.1

        Gas sensing materials for detecting inflammable gas such as alcohol, propane, acetic acid, carbon monoxide, hydrogen were developed by utilizing MgO-Cr₂O₃-TiO₂ system. Between 300℃ and 500℃, reversible chemisorption becomes dominant and the electrical canduction of P-type semiconductive with the gas chemisorption. The ceramic sensor exhibits a high sensitivity to particular reducing gas such as alcohol, whereas propane and butane have little effect on the resistivity. The time response of adsorption is estimated to be about 20 sec. On the other hand, the desorption process, which corresponds to oxidation due to oxygen adsorption, take more than 60 sec. Thus the ceramic sensor can be used as a alcohol sensor in an ambient atmosphere. As the oxygen concentration is increased from 0.1 to 10 precent(10³-10^6ppm), the resistance decreases rapidly but stabilizes at higher concentration.

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