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RISS 인기검색어
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- 저자 : 정경락 (검색결과 144 건)
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정경락,변윤섭,김성종,장경환,양영석,정인수 전북대학교 공업기술연구소 1991 工學硏究 Vol.22 No.-
Anatase TiO_2 particles prepared by experiment were used to study change of crystal structure by calcination temperature. The results were as follows. Crystallite size of anatase TiO_2 particles increased with calcination temperature. The rate of increasing the crystallite size of anatas TiO_2 particles was decreased below 700℃ and was markedly increased above 700℃. Unit cell volume of TiO_2 was expanded at low temperature and was contracted at high temperature. This result means that the growth of crystallite size was occurred in the C direction.
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Tube Bank에 있어서 流線의 有無에 따른 壓力降下에 관한 硏究
정경락,정재성,김성종,김능배 전북대학교 공업기술연구소 1986 工學硏究 Vol.17 No.-
Pressure drops have been measured in 80℃ water flowing through two banks of 2.54cm steel tubes. The flow was horizontal and perpendicular to the vertical tube. The tube banks had uniform and non-uniform transverse spacing. The uniform bank was an in-line array, five tubes wide and twenty-one tubes long with 9.525mm clearance between adjacent tubes. In the nonuniform case, a tributary was formed by removing the center row of tubes. Measurements were made with and without progressive removal of water through a grid of uniform openings in the bottom tube sheet.
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정경락,장경환 全北大學校 1992 論文集 Vol.34 No.-
The adsorption characteristics of phenols by the surface-modified activated carbon fibers from its aqueous solution was examined. Cellulose activated carbon fiber(toyobo Co. KF-1500) was used as an adsorbent, and it was treated with heat, air and helium. Pore-size distribution, BET surface area and surfce acidity were measured. The adsorption isotherms were found to conform with the Freundlich equation and its k values were ranged from 1.5381 to 3.6076 mmol/ g and its 1/ n values were ranged from 0.1798 to 0.3144. The affinity of each adsorbate on activated carbon fiber increased in the order ; Phenol <PCP<PNP. The adsorption capacity decreased when oxidized carbon was used, while it increased when redused carbon was used. The adsorption capacity increased when its surface area increased. It is concluded that the adsorption capacity changes in relation with the surface oxides and the surface area of the activated carbon fiber.
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정경락,변윤섭,김성종,장경환,양영석,정인수 전북대학교 공업기술연구소 1991 工學硏究 Vol.22 No.-
본 연구는 염소법으로 TiCl_4와 O²를 기상반응시켜 TiO²초미립자를 제조하여 생성된 Anatase 형 TiO_2를 대상으로 Anatase-Rutile의 상전이, 첨가제 및 기체 주위조건의 영향을 연구하였다. 연구결과를 요약하면 다음과 같다. 1. Anatase-Rutile의 상전이 반응에서 주된 변수는 온도이며, 속도식은 Avrami식의 결정생성과 성장모델을 따른다고 할 수 있으며, 활성화 에너지는 70kcal/mole이었다. 2. 첨가제 및 기체 주위조건의 영향에 대해서 CuO의첨가는 전이를 촉진시키는 역학을 하였으며, 진공에서는 억제시키는 것으로 나타났다. 3. Anatase형에서 Rutile형으로의 상전이 메카니즘은 Rutile핵 생성 자리가 될 수 있는 외부이온의 확산 또는 기체 주위조건의 영향에 의해 음이온 공백을 형성하고, 음이온 공백은 티타네이트 화학물을 생성한다. 이런 단계를 거치면서 Anatase형 안에서 격자결함을 유발시켜 Rutile형으로의 전이에 영향을 미치는 것이라 할 수 있다.
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