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염화제이철 수용액에서 섬아연광의 용해에 관한 속도론적 연구
유승준,박형상,최청송,소칠섭,Yoo, Seung-Joon,Park, Hyung-Sang,Choi, Cheong-Song,So, Chil-Sup 대한자원환경지질학회 1993 자원환경지질 Vol.26 No.3
Dissolution reactions of chemical grade zinc sulfide and natural sphalerite were studied in ferric chloride solution as an oxidant. To enhance the leaching reaction, ultrasonic technique was employed in this investigation. For the reaction with pure zinc sulfide, chemical reaction was the rate limiting step in the range of low conversion irrespective of applying ultrasonic wave. And the diffusion through liquid film instead of diffusion through product layer of free sulfur was the rate determining step because ultrasonic vibration removes the product from reaction zone. In the case of sphalerite with the ultrasonic vibrator, it was found that inert mineral layer diffusion was the rate determining step, in which the elemental sulfurs formed were removed by the ultrasonic action. Experimental results showed that the ultrasonic technique proved to be the methods which can significants improve the leaching performance.
분체공학,유동층,고분자,재료(무기, 유기) : 내열용기의 원료성분비와 입도에 의한 열충격 저항성의 영향
유승준 ( Seung Joon Yoo ),이세일 ( Se Il Lee ),박한진 ( Han Jin Park ),안일수 ( Il Soo Ahn ),김광길 ( Kwang Gil Kim ),윤호성 ( Ho Sung Yoon ),김성돈 ( Sung Don Kim ),변윤섭 ( Yoon Seop Byoun ),김종옥 ( Jong Ok Kim ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.2
염료감응형 태양전지의 광전자 재결합 방지를 위한 Al<sub>2</sub>O<sub>3</sub> 코팅 TiO<sub>2</sub> 전극 제조
황경준,유승준,정성훈,김선일,이재욱,Hwang, Kyung-Jun,Yoo, Seung-Joon,Jung, Sung-Hoon,Kim, Sun-Il,Lee, Jae-Wook 한국공업화학회 2010 공업화학 Vol.21 No.2
최근에 염료감응형 태양전지(dye-sensitized solar cells, DSSCs)의 에너지 변환 효율을 증가시키기 위한 방법으로 흡착된 염료에서 발생되는 광전자가 전해질 속의 산화/환원되는 요오드 이온($I_3^-/I^-$)과의 재결합(recombination)을 방지하기 위하여 발생된 광전자를 효율적으로 $TiO_{2}$ 전극을 통해 이동시키는 방법에 관한 연구가 활발히 연구되고 있다. 본 연구에서는 이러한 재결합을 방지하기 위하여, 졸-겔(sol-gel)법으로 합성한 보헤마이트(bohemite) 졸을 이용하여 $TiO_{2}$ 전극에 비해 높은 에너지 밴드갭(band-gap)을 가지고 있는 $Al_2O_3$가 코팅된 이중층의 다공질 나노 $TiO_{2}$ 전극을 제조하고 염료감응형 태양전지에 응용하였다. 특히, 다양한 입자의 크기가 조절된 보헤마이트 졸을 통해 최고의 에너지 변환 효율을 가진 $Al_2O_3$가 코팅된 $TiO_{2}$ 광전극 제조 조건을 조사하였다. 입자 크기 100 nm 보헤마이트 졸로부터 제조한 $Al_2O_3$가 코팅된 $TiO_{2}$ 전극이 순수 $TiO_{2}$로 제조한 광전극 층(7.5%)에 비해 높은 에너지 변환 효율(9.0%)을 보였다. To increase the energy conversion efficiency of dye sensitized solar cells (DSSCs), it has been widely studied how to effectively transferred the electron generated from the adsorbed dye to the $TiO_{2}$ electrode for avoiding the recombination of injected electrons and iodide ions ($I^-/I_3^-$). For the blocking of the recombination, in this study, $Al_2O_3$-coated $TiO_{2}$ electrode was prepared and applied for DSSCs. In especial, the optimal preparation conditions of $Al_2O_3$ coated onto $TiO_{2}$ porous film was proposed for higher energy conversion efficiency. As a result, the solar cells fabricated from $Al_2O_3$-coated (i.e., particle size of bohemite sol : 100 nm) $TiO_{2}$ electrodes showed superior conversion efficiency (9.0%) compared to the bare $TiO_{2}$ electrodes (7.5%).
NO<sub>x</sub>제거를 위한 Fe/ZSM-5와 Co-Pt/ZSM-5의 상승 효과
김진걸(Kim Jin Gul),유승준(Yoo, Seung-Joon),김성수(Kim Seong-Soo) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.9
공간속도 30000 hr<sup>-1</sup>에서 Fe/ZSM-5 촉매의 SiO₂/AL<sub>2</sub>O₃ 몰비가 감소함에 따라 NOx 제거 수율은 증가하였다. Fe/ZSM-5는 반응 온도 350oC - 400oC 사이에서 최대 50%의 질소 산화물 제거 수율을 나타내지만 높은 CO 발생량 이 관찰된다. Fe/ZSM-5 촉매에서 생성되는 CO를 제거하기 위하여 Co-Pt/ZSM-5 촉매를 직렬로 연속하여 사용하였으 며, 공간속도 13000 hr<sup>-1</sup>, 반응 온도 250oC 조건에서 90% 이상의 질소 산화물과 CO 제거 수율을 나타내었다. In the condition of GHSV=30000 hr<sup>-1</sup> , NOx removal yield was higher as mole ratio of SiO₂/AL<sub>2</sub>O₃ for Fe/ZSM-5 was lower regardless of preparation method such as CVD (chemical vapor deposition) and dry impregnation. In addition to this, Fe/ZSM-5 catalyst showed about 50% NOx removal yield between 350 o C - 400 o C while CO formed significantly. To remove newly formed CO over Fe/ZSM-5, Co-Pt/ZSM-5 was used in conjunction with Fe/ZSM-5 in the series and this demonstrated over 90% removal yield of both NOx and CO at 250 o C and GHSV=13000 hr<sup>-1</sup>.
논문(論文) : DAF 공정을 이용한 축산폐수의 고형물 분리와 부상특성
강병준 ( Byong Jun Kang ),유승준 ( Seung Joon Yoo ),이세일 ( Se Il Lee ),곽동희 ( Dong Heui Kwak ) 대한상하수도학회 2008 상하수도학회지 Vol.22 No.3
The series of experiments under the various conditions were carried out to evaluate the feasibility of dissolved air flotation (DAF) as an alternative of conventional gravity sedimentation (CGS) and to investigate the decrease of the loadings following to biological wastewater treatment processes in livestock wastewater system. On the basis of the experiment result between CGS and DAF processes, for the other water quality criteria as well as suspended solid the removal efficiency of DAF process was about 20~25 % better than CGS process on average. In addition, the particle removal efficiency of DAF process became higher in proportion as the increase of air to solid (A/S) ratio and the general wastewater treatment efficiency of DAF process was enough to meet the requirement of loading decrease to following biological process even at low A/S ratio range. Though DAF process is widely known as an solid separation unit, there was not the notable relationship between particle separation efficiency and several pollutant removal efficiencies like CODCr and nutrients (T-N, T-P). Assume that the CODCr was removed as the fraction of particle separation in this experiment, the removal efficiency of T-N and T-P were sensitive to removal efficiency of CODCr, especially.