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여러가지 溫度 및 媒條件下에서 셀룰로로오스의 熱分解時 非凝縮性가스의 成分組成에 關한 硏究
朴來正,姜元萬 弘益大學校 1978 弘大論叢 Vol.10 No.-
The production of non-condensible gases obtained from flash pyrolysis of cellulosic materials at different temperatures and with adid-base catalysts were investigated and the results were as follows. 1. When the sawdust was pyrolyzed below 300℃, major non-condensible gases were CO₂ and H₂O, producing little flammable gases. 2. Pyrolysis above 400℃ produced flammable gases such as hydrogen, carbon monoxide, ethylene, propylene, and propane. 3. The amount of non-condensible gases was plotted against temperatures from 400℃ to 700℃ at 100degree interval. The amount of the gases increases exponentially with temperatures. 4. The acid catalysts such as phosphoric acid and zinc chloride significantly reduced the production of flammable gases, but increased production of carbon dioxide. However, a phosphoric acid catalyst showed some increase in methane production. 5. A base catalyst, calcium carbonate markedly increased the production of flammable gases, in particular, production of carbon monoxide.
종합병원 병동부의 공공공간에 관한 건축계획적 연구 : 복도 및 휴게 공간을 중심으로
김만영,양내원 한국의료복지시설학회 2000 의료·복지 건축 Vol.6 No.10
Most of the existing studies of hospital ward were concentrated on the bed room and there was no study on the day place and corridor space for the inpatient. According to the existing study, 50% inpatients move here and there freely and they want to have a rest in the day place or corridor of the general hospital. So the purpose of this study is to find out the reason why the inpatients prefer to rest in the day place, to survey the inpatients' behavior there and to stress the importance of exterior environment except the bed room in the public space of hospital.
朴來正,姜元萬 弘益大學校 1981 弘大論叢 Vol.13 No.-
Sawdust from timber mills, as one of the solid organic wastes, was pyrolyzed in a fluidized bed. Satisfactory fluidization was achieved with a 3 cm layer of -7 +14 mesh silica on 150 mesh brass screen as a distributer. Screen packing did not prevent the slugging phenomena but rather made the fluidity worse. The minimum fluidization velocity(Umf) of the sawdust was lowered as carbonization proceeded. Accordingly, the input rate of nitrogen gas was controlled considering the lowering of Umf along with the gas expansion due to heating under the fluidization conditions. Sawdust was pyrolyzed at 400℃, 600℃, and 800℃, respectively, and condensible pyrolytic products were collected in various cooling traps; air cooling, ice water cooling, and dry ice-acetone cooling. On the average, 36.7% of tar products, 26.3% of carbonized residue, 1.8% of volatile liquid, and 35.5% of non-condensible gases were produced. The higher the pyrolytic temperature, the less carbonized residue and tar products were produced. Ⅰ. 緖 論 Ⅱ. 實驗材料 및 方法 1. 材 料 2. 熱分解 裝置 3. 捕集裝置 4. 熱分解操作 및 條件 Ⅲ. 實驗結果 및 考察 1. 流動層操作의 裝置 및 條件의 設定 2. 熱分解 生成物의 捕集量 Ⅳ. 結 論
김채옥,박래만 漢陽大學校 自然科學硏究所 1997 自然科學論文集 Vol.16 No.-
Fe-Zr계는 조성비에 따라 초전도성과 강자성을 가지며 그 중간의 좁은 조성영역에서는 상자성을 나타낸다. 그러나, 조성비에 따른 특성역역의 경계가 명확하지 않다. FeZr₂는 강자성과 상자성의 경계가 되는 조성비를 갖는 합금으로서 비정질 FeZr₂이미 상자성이라는 것이 알려져 있다. 그러나, 결정질FeZr₂의 자기적 특성은 아직 조사된 바가 없어 이를 조사하는 것은 중요하다. 결정구조를 XRD를 통해 알아보았으며, 온도에 따른 자기모멘트와 외부자장에 따른 자기모멘트를 측정하였다. 그 결과 결정구조는 tetragonal을 이루었으며, 자기모멘트의 값이 ∼?????? 정도로 작게 나타났다. 한편, 전이온도 추정이 어려울 정도로 온도에 따른 자기모멘트의 변화가 작았으며, 400K 이하에서는 자기적 전이 특성이 나타나지 않았다. 자기이력 곡선의 경우에는 이력이 매우 작게 나타났으며, 포화 자기모멘트에 이르는 외부자장값 즉, 포화자장 값이 매우 큰 것으로 나타났다. 따라서, 결정질FeZr₂는 비정질이 상자성인 것과는 달리 반강자성으로 판단된다. Fe-Zr system shows the property of superconductivity and Ferromagnetism as the Fe-Zr composition ratio changes and paramagnetism in the narrow region between superconductivity and Ferromagnetism. However the characteristic boundary of the Fe-Zr composition ratio for the Fe-Zr system properties is not clear. FeZr₂is located on the boundary region between ferromagnetism and paramagnetism and amorphous FeZr₂is reported to be paramagnetic, but it is very important to investigate the properties of the crystalline FeZr₂because crystalline FeZr₂is not investigated yet. FeZr₂crystal was investigated lattice structure by the method of XRD and measured the magnetic moments as temperature increases and external magnetic field variates. As a results, the crystal structure was tetragonal and the value of the magnetic moment was about ??? order emu/g, very small. On the other hand, The variation of the magnetic moment as temperature increases is very small, so it is very difficult to estimate the magnetic transition temperature. In the magnetic hysteresis graph, the hysteresis is very small and saturation magnetic field was high. So crystalline FeZr₂is thought antiferromagnetic.
Nae-Man Park,성건용,Sang Hyeob Kim 한국전자통신연구원 2004 ETRI Journal Vol.26 No.3
We grew amorphous SiCN films by pulsed laser deposition using mixed targets. The targets were fabricated by compacting a mixture of SiC and Si3N4 powders. We controlled the film stoichiometry by varying the mixing ratio of the target and the target-to-substrate distance. The mixing ratio of the target had a dominant effect on the film composition. We consider the structures of the SiCN films deposited using 30 ~ 70 wt.% SiC in the target to be an intermediate phase of SiC and SiNx. This provides the possibility of growing homogeneous SiCN films with a mixed target at a moderate target-to-substrate distance.
Electroluminescent nanocellulose paper
Park, Nae-Man,Koo, Jae Bon,Oh, Ji-Young,Kim, Hye Jin,Park, Chan Woo,Ahn, Seong-Deok,Jung, Soon Won Elsevier 2017 Materials letters Vol.196 No.-
<P><B>Abstract</B></P> <P>Surface light-emitting transparent nanocellulose papers operating by alternating current voltages were demonstrated, where phosphors were embedded in the paper and silver nanowire electrodes were formed on both side of the paper. Silver nanowire electrodes were first coated on membrane filter with vacuum filtration using wet wiper tissues and then successfully transferred to the paper surface by a mechanical compression. The power consumption of a light-emitting paper was small in less than 0.36W/cm<SUP>2</SUP>. We could control the luminescent color and intensity from light-emitting papers by adjusting electrical frequency and the applied voltage level. White light emission was also demonstrated by using phosphors with a broad luminescence spectrum. The results develop into a versatile approach for commercializing the nanofibrillated cellulose and pave the way towards the realization of commercially viable, flexible and transparent light-emitting papers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Light-emitting transparent nanocellulose papers are demonstrated. </LI> <LI> Ag NWs/nanocellulose/phosphors/nanocellulose/Ag NWs structure is suggested. </LI> <LI> Luminescent color and intensity was controlled by AC frequency and voltage. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>We introduced light-emitting transparent nanocellulose papers operated by alternating current voltages, which is fabricated by 50μm-thick transparent nanocellulose papers to embed luminescent phosphors between Ag nanowire electrodes. The luminescent color and intensity was controlled by electrical frequency and the applied voltage level.</P> <P>[DISPLAY OMISSION]</P>