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Synthesis and characterization of carbon doped TiO₂ photocatalysts supported on stainless steel mesh by sol-gel method
JO. Tijani, OO. Fatoba, TC. Totito, WD. Roos, LF. Petrik 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 6 48-59 (12 pages)
4×4 cm stainless steel mesh using the dip-coat- ing method with a drawing speed of 5.0 cm/min. This procedure was repeated three times, and afterwards, the coated mesh was oven dried at 90°C for 5 min followed by pyrolysis in a N 2 atmo- sphere at 300, 350 or 400°C in a Labfurn tube furnace. A heating rate of 50ºC/min. and a holding time of 1 to 4 h were used. The procedure also included a... suggested the substitution of titanium in TiO₂ by carbon. Instead of using calcination, PAN pyrolysis was used to control the carbon content, and the mesoporosity was tailored by the applied temperature. The supported TiO₂ nanocrystals prepared by pyrolysis at 300, 350, and 400ºC for 3 h on a stainless steel mesh were actual supported carbon doped TiO₂ nanocrystals. Thus, PAN/DMF/TiCl₄ offers a facile, robust sol-gel related route for preparing supported carbon doped TiO₂ nanocomposites. -
Sorption behavior of slightly reduced, three-dimensionally macroporous graphene oxides for physical loading of oils and organic solvents
Ho Seok Park, Sung Oong Kang 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2016, Vol.18 4 24-29 (6 pages)
reduction time. GO, graphene oxide; C/O ratio, carbon-to-oxygen ratio. ..PAGE:4 Sorption behavior of slightly reduced, three-dimensionally macroporous graphene oxides 27 http://carbonlett.org adsorption-desorption experiment and analyzed by the BET equation and the BHJ method, have been used to describe the absorption capture of oils and organic solvents. However, the contribution of SSA to the... High pollutant-loading capacities (up to 319 times its own weight) are achieved by three-dimensional (3D) macroporous, slightly reduced graphene oxide (srGO) sorbents, which are prepared through ice-templating and consecutive thermal reduction. The reduction of the srGO is readily controlled by heating time under a mild condition (at 1 10?2 Torr and 200°C). The saturated sorption capacity of the hydrophilic srGO sorbent (thermally reduced for 1 h) could not be improved further even though the... -
Flow cytometric evaluation on the age-dependent changes of testicular DNA contents in rats
Chang Yong Yoon, Choong Man Hong, Yong-Yeon Cho, Ji Young Song, I Jin Hong, Dae Hyun Cho, Beom Jun Lee, Hee Jong Song, Cheol Kyu 대한수의학회 Journal of Veterinary Science 4 Pages
대한수의학회 Journal of Veterinary Science 2001, 제 2권 제 1호 7 43-46 (4 pages)
seminiferous tubule diame- ter, testicular biopsy score, and tubular fertility have been used to assess the status of the testis. Recently, flow cytom- etry has been reported to be the most sensitive method [11]. In this study, we identified the various cell types occurring in the testes of SD rats aged from 4 weeks to 26 weeks old using FCM. Especially, the preparation of sam- ples was performed ... to the level of 42% at the age of 26 weeks. The proportion of immature haploid cells was dramatically increased to the age of 6 weeks, then maintained at the level of 20 to 30% thereafter. The proportion of diploid cells was 64% at the age of 4 weeks, then decreased gradually through the age of 26 weeks. The proportion of S-phase cells was increased to the age of 4 weeks, then maintained at a plateau level to the age of 26 weeks. The proportion of tetraploid cells were about 26% at the age of 4... -
A Study on Assessment Design for In-class Debates - With a Focus on Case Analyses of Judging at World Debating Championships
Lee Sun Young, Park Joshua 경인교육대학교 교육연구원 The Journal of Education 20 Pages
경인교육대학교 교육연구원 The Journal of Education 2019, Vol.2 No.2 7 85-104 (20 pages)
T ctives sment philosop ng for assessme y, assessment co Method on esign hieved sm was appropr was justified cope uation Design need to be Debate tourn n the organizi erent objectiv stics of debate matter or to he phies ent. ontent riate set. Debate naments can ing body or ves: Korean e discourse; elp students ..PAGE:15 A Study on Assessment Design for In-class Debates - 99 -... the most advanced developments in assessment methodologies and gain insights from the perspectives and experiences of expert educators. This study applies these insights to offer recommendations on assessment designs and evaluative elements for in-class debates. While this study is limited as a qualitative analysis of debate assessment practices, it adds unique value to literature by providing an initial step to linking international, Worlds-level debating to domestic in-class debate assessment. -
음악창작의 문화 비교를 위한 예비연구 - 한국과 미국을 중심으로 -
박은실, 강상미 한국음악교육학회 음악교육연구 22 Pages
한국음악교육학회 음악교육연구 2020, 제 49권 제 4호 3 53-74 (22 pages)
the Korean group, 19 students(59.4%) were male and 13 students were female. 16 U.S. students(45.7%) were male and 19 U.S. students were female. Among U.S. students, ethnicities were as follows: 71.4% European/White, 22.9% Asian, and 5.7% Hispanic. The Korean participants were marked as 100% Asian. Korean students have been practicing rhythm-changing expressions or music making using technolo... 대한 문화를 비교하는 것이다. 32명의 한국학생들과 35명의 미국학생들을 대상으로 4주간 창작 지도를 하고 MuseScore2를 이용하여 8마디 가락을 창작하게 하였다. 합의적 평가기법(CAT)을 이용하여 평가한 결과, 두 나라 간 창의성에서 통계적으로 유의미한 차이가 없었다. 그러나 창의성에서 높은 점수와 낮은 점수를 받은 작품들을 추가적으로 분석한 결과, 창의성이 높은 그룹은 다양한 소리 선택, 발전과 대조, 구조화 등의 특징을, 그렇지 않은 그룹은 제한된 소리 선택, 단순함/반복의 특징을 공통적으로 가지고 있었다. 이미 있는... -
Electrochemical determination of chloramphenicol using a glassy carbon electrode modified with dendrite-like Fe₃O₄ nanoparticles
Krishnan Giribabu, Sung-Chan Jang, Yuvaraj Haldorai, Muruganantham Rethinasabapathy, Seo Yeong Oh, Arunkumar Rengaraj, Young-Kyu Han 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.23 6 38-47 (10 pages)
residues in animal feeds by liquid chromatog- raphy with photo-diode array detection. Anal Chim Acta, 558, 11 (2006). https://doi.org/10.1016/j.aca.2005.10.059. 3.8. Practical application of the Fe3O4/GCE The method based on the Fe3O4/GCE developed in this study was applied to determine the CAP in an ethanolic extract of shrimp samples collected from a local market in Incheon, Korea. The CAP w... (CAP) by cyclic voltammetry and square wave voltammetry. A reduction peak of CAP at the Fe3O4/GCE was observed at 0.62 V, whereas the uncoated GCE exhibited a very small response compared to that of the Fe3O4/GCE. The electrocatalytic ability of Fe3O4 was mainly attributed to the formation of Fe(VI) during the anodic scan, and its reduction to Fe(III) on the cathodic scan facilitated the sensing of CAP. The effects of pH and scan rate were measured to determine the optimum conditions at which th... -
Graphitization of PAN-based carbon fibers by CO₂ laser irradiation
Liangbo Yao, Weimin Yang, Sanyang Li, Yang Sha, Jing Tan, Ying An, Haoyi Li 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 13 97-102 (6 pages)
4] invented a microwave-based manufacturing method which is capable of producing PAN-based graphite fbers with higher crystalline stacking size Lc and lower crystalline planar size La compared to conventional CFs. Lasers are also a kind of heat source which may be a candidate for the graphitization of CFs. Lott et al. [5] used a laser for the stabilization and carbonization of the carbonaceous... diffraction data revealed that the growth of crystallite was parallel to the fiber axis, and the interlayer spacing d002 decreased from 0.353 to 0.345 nm. The results of scanning electron microscopy revealed that the surface of irradiated CFs was rougher than that of the unirradiated ones and there were scale-like small fragments that had peeled off from the fibers. The tensile modulus increased by 17.51% and the Weibull average tensile strength decreased by 30.53% after being irradiated by a... -
Method and mechanism of dispersing agent free dispersion of short carbon fibers in silicon carbide powder
Thakur Sudesh Kumar Raunija, Mariamma Mathew, Sharad Chandra Sharma 한국탄소학회 Carbon Letters 7 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.3 4 180-186 (7 pages)
50 vol% CFs loading. 4. Conclusions A novel methodology for the dispersion of CFs in SiC powder without any dispersing agent was established and demonstrated successfully. The probable mechanism behind the rapid and ef- fective dispersion of CFs, resulting from the inclusion of an ex- foliation step in the method, was conceptualized and explained. The method’s rapid dispersion of CFs in SiC... a novel method and mechanism for the rapid and effective milling of carbon fibers (CFs) in silicon carbide (SiC) powder, and also the dispersion of CFs in SiC powder. The composite powders were prepared by chopping and exfoliation of CFs, and ball milling of CFs and SiC powder in isopropyl alcohol. A wide range of CFs loading, from 10 to 50 vol%, was studied. The milling of CFs and SiC powder was checked by measuring the average particle size of the composite powders. The dispersivity of CFs in... -
엔진실린더내의 유동해석을 위한 수치해석방법
최종욱, 이용호, 박찬국, Choi. J. W., Lee. Y. H., Park. C. K. 한국전산유체공학회 한국전산유체공학회지 7 Pages
한국전산유체공학회 한국전산유체공학회지 2000, Vol.5 No.1 1-7 (7 pages)
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피스톤에 의해 유입되는 유동에 대한 유한요소법을 이용한 수치해석
최종욱, 박찬국, Choi. J. W., Park. C. K. 한국전산유체공학회 한국전산유체공학회지 8 Pages
한국전산유체공학회 한국전산유체공학회지 1999, Vol.4 No.2 39-46 (8 pages)