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881.

역량중심 교육과정의 핵심요소가 중학생의 역량에 미치는 영향 분석

길혜지, 김주아 한국교육학회 교육학연구 27 Pages

한국교육학회 교육학연구 2018, 56권 4호 12 289-315 (27 pages)

길혜지, 김주아 저
...
- 5,600원
이 연구는 역량중심 교육과정의 핵심요소들, 즉, 학생참여형 수업, 교과내용의 의미 내면화, 과정중심평가, 그리고 평가 및 피드백이 중학생의 역량에 어떠한 영향을 미치는지 탐색하는 데 주된 목적이 있다. 이를 위해 한국교육개발원에서 2017년에 수집한 KEDI 학생역량 조사 자료 중에서 전국의 55개 중학교에 재학 중인 3학년 2,769명의 자료를 활용하였으며, 개정 교육과정에서 명시한 6가지 핵심역량을 종합하여 산출한 역량지수를 종속변수로 하여 2수준 다층분석을 실시하였다. 주요 연구결과를 요약하면 다음과 같다. 첫째,...
882.

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)

Krishnan Giribabu, Sung-Chan Jang, Yuvaraj Haldorai, Muruganantham Rethinasabapathy, Seo Yeong Oh, Arunkumar Rengaraj, Young-Kyu Han 저
...
- 3,000원
In this study, magnetite (Fe3O4) nanoparticles were electrochemically synthesized in an aqueous electrolyte at a given potential of -1.3 V for 180 s. Scanning electron microscopy revealed that dendrite-like Fe3O4 nanoparticles with a mean size of < 80 nm were electrodeposited on a glassy carbon electrode (GCE). The Fe3O4/GCE was utilized for sensing chloramphenicol (CAP) by cyclic voltammetry and square wave voltammetry. A reduction peak of CAP at the Fe3O4/GCE was observed at 0.62 V, whereas...
883.

Synthesize multi-walled carbon nanotubes via catalytic chemical vapour deposition method on Fe-Ni bimetallic catalyst supported on kaolin

Aliyu A, Abdulkareem AS, Kovo AS, Abubakre OK, Tijani JO, Kariim I 한국탄소학회 Carbon Letters 18 Pages

한국탄소학회 Carbon Letters 2017, Vol.21 5 33-50 (18 pages)

Aliyu A, Abdulkareem AS, Kovo AS, Abubakre OK, Tijani JO, Kariim I 저
...
- 4,700원
purely crystalline ternary oxide (NiFe2O4). The statistical analysis of the variance demonstrates that the combined effects of the reaction temperature and acetylene flow rate predominantly influenced the MWCNT yield. The N2 adsorption (BET) and TGA analyses reveal high surface areas and thermally stable MWCNTs. The HRTEM/HRSEM micrographs confirm the formation of tangled MWCNTs with a particle size of less than 62 nm. The XRD patterns of the MWCNTs reveal the formation of a typical graphitized...
884.

Effects of carbon additives on heat-transfer and mechanical properties of high early strength cement mortar

Dae-Geun Lee, Kyung Hoon Kim, Hyeong Gi Kim, Young-Seak Lee 한국탄소학회 Carbon Letters 4 Pages

한국탄소학회 Carbon Letters 2016, Vol.20 11 72-75 (4 pages)

Dae-Geun Lee, Kyung Hoon Kim, Hyeong Gi Kim, Young-Seak Lee 저
...
- 1,500원
The repair of mortar-based structures is critically important because mortar-based structures such as buildings, bridges, tunnels, highway and roads are inevitably degraded by deterioration or damage. To save expense during construction and to avoid traffic congestion during repair work, it is very important to reduce construction time as much as possible. In order to reduce construction time, therefore, the setting time of mortars has to be shortened. The mortars which have short setting times...
885.

The effect of the spinning conditions on the structure of mesophase pitch-based carbon fibers by Taguchi method

Zhao Jiang, Ting Ouyang, Xiangdong Yao, Youqing Fei 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2016, Vol.19 11 89-98 (10 pages)

Zhao Jiang, Ting Ouyang, Xiangdong Yao, Youqing Fei 저
...
- 3,000원
While it was observed that thicker carbon fiber generally shows improved preferred orientation, the most important variable affecting the preferred orientation was found to be the entry angle. As the entry angle decreased from 120° to 60°, the shear flow was enhanced to induce more ordered radial alignment of crystallite planes so as to obtain carbon fibers with a higher degree of preferred orientation. As a consequence, the crack angle was increased, and the tensile modulus was improved.
886.

Nanoporous graphene oxide membrane and its application in molecular sieving

S. Mahmood Fatemi, Masoud Arabieh, Hamid Sepehrian 한국탄소학회 Carbon Letters 9 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.3 4 183-191 (9 pages)

S. Mahmood Fatemi, Masoud Arabieh, Hamid Sepehrian 저
...
- 3,000원
sizes and geometries of pores were modeled on the graphene oxide sheet. This was done using atomistic simulations considering mean-squared displacement, diffusion coefficient, number of crossed species of gases through nanoporous graphene oxide, and flow through interlayer galleries. The results showed that the gas features have the densest adsorbed zone in nanoporous graphene oxide, compared with a graphene membrane, and that graphene oxide was more favorable than graphene for Kr separation. Th...
887.

Bulk graphite: materials and manufacturing process

Sang-Min Lee, Dong-Su Kang and Jea-Seung Roh 한국탄소학회 Carbon Letters 12 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.3 1 135-146 (12 pages)

Sang-Min Lee, Dong-Su Kang and Jea-Seung Roh 저
...
- 4,100원
Graphite can be classified into natural graphite from mines and artificial graphite. Due to its outstanding properties such as light weight, thermal resistance, electrical conductivity, thermal conductivity, chemical stability, and high-temperature strength, artificial graphite is used across various industries in powder form and bulk form. Artificial graphite of powder form is usually used as anode materials for secondary cells, while artificial graphite of bulk form is used in steelmaking...
888.

Activated carbons prepared from mixtures of coal tar pitch and petroleum pitch and their electrochemical performance as electrode materials for electric double-layer capacitor

Eunji Lee, Soon Hyung Kwon, Poo Reum Choi, Ji Chul Jung, Myung-Soo Kim 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.2 2 78-85 (8 pages)

Eunji Lee, Soon Hyung Kwon, Poo Reum Choi, Ji Chul Jung, Myung-Soo Kim 저
...
- 3,000원
using potassium hydroxide (KOH) powder as the activation agent. The optimal activation conditions were determined to be a CTP/KOH ratio of 1:4, activation temperature of 900°C, and activation time of 3 h. The obtained ACs showed increased pore size distribution in the range of 1 to 2 nm and the highest specific capacitance of 122 F/g in a two-electrode system with an organic electrolyte, as measured by a charge-discharge method in the voltage range of 0-2.7 V. In order to improve the performanc...
889.

CO2 adsorption characteristics of slit-pore shaped activated carbon prepared from cokes with high crystallinity

Mi-Seon Park, Si-Eun Lee, Min Il Kim and Young-Seak Lee 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.1 7 45-50 (6 pages)

Mi-Seon Park, Si-Eun Lee, Min Il Kim and Young-Seak Lee 저
...
- 3,000원
High crystallinity coke-based activated carbon (hc-AC) is prepared using a potassium hydroxide solution to adsorb carbon dioxide (CO2). The CO2 adsorption characteristics of the prepared hc-AC are investigated at different temperatures. The X-ray diffraction patterns indicate that pitch-based cokes prepared under high temperature and pressure have a high crystal structure. The textural properties of hc-AC indicate that it consists mainly of slit-like pores. Compared to other textural forms of AC...
890.

Adsorption of volatile organic compounds using activated carbon fiber filter in the automobiles

Hyung Suk Moon, In Soo Kim, Sin Jae Kang, Seung Kon Ryu 한국탄소학회 Carbon Letters 7 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.3 8 203-209 (7 pages)

Hyung Suk Moon, In Soo Kim, Sin Jae Kang, Seung Kon Ryu 저
...
- 3,000원
The adsorption capacities of formaldehyde, toluene, and benzene on an ACF filter were far better than those of a polypropylene (PP) mat filter and combined (PP+activated carbon) mat filter by batch adsorption in a gas bag. In a continuous flow of air containing toluene vapor through an ACF packed bed, the breakpoint time was very long, the length of the unused bed was short, and sharp “S” -type breakthrough curve was plotted soon after breakpoint, showing a narrow mass transfer zone of toluene...

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