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121.

Psychometric Properties of Context-Specific Measures of Students’ Interest and Value in Learning Science : A Multinational Examination

Ham EunHye, Jang Hyesuk, Shin TaeSeob 한국교육학회 교육학연구 22 Pages

한국교육학회 교육학연구 2015, 53권 4호 12 305-326 (22 pages)

Ham EunHye, Jang Hyesuk, Shin TaeSeob 저
...
- 5,100원
This study aims to examine how context-specific measures of students' interest and value differ from their context-general measures in psychometric properties across countries. Using PISA2006 Science data, differential effects of item context on assessing interest and value were illustrated in both the individual and country levels. The main findings are as follows: First, correlation between context-specific and context-general measures tended to be slightly higher in value than in interest....
122.

High-energy-density activated carbon electrode for organic electric-double-layer-capacitor using carbonized petroleum pitch

Poo Reum Choi, Sang-Gil Kim, Ji Chul Jung, Myung-Soo Kim 한국탄소학회 Carbon Letters 11 Pages

한국탄소학회 Carbon Letters 2017, Vol.22 8 70-80 (11 pages)

Poo Reum Choi, Sang-Gil Kim, Ji Chul Jung, Myung-Soo Kim 저
...
- 4,000원
Activated carbons (ACs) have been used as electrode materials of electric double-layer capacitors (EDLC) due to their high specific surface areas (SSA), stability, and ecological advantages. In order to make high-energy-density ACs for EDLC, petroleum pitch (PP) precarbonized at 500?1000°C in N2 gas for 1 h was used as the electrode material of the EDLC after KOH activation. As the pre-carbonization temperature increased, the SSA, pore volume and gravimetric capacitance tended to decrease, but...
123.

Thermo-electrical properties of randomly oriented carbon/carbon composite

Thakur Sudesh Kumar Raunija, N. Supriya 한국탄소학회 Carbon Letters 11 Pages

한국탄소학회 Carbon Letters 2017, Vol.22 3 25-35 (11 pages)

Thakur Sudesh Kumar Raunija, N. Supriya 저
...
- 4,000원
The aim of the work was to investigate the thermo-electrical properties of low cost and rapidly produced randomly oriented carbon/carbon (C/C) composite. The composite body was fabricated by combining the high-pressure hot-pressing (HP) method with the lowpressure impregnation thermosetting carbonization (ITC) method. After the ITC method step selected samples were graphitized at 3000°C. Detailed characterization of the samples’ physical properties and thermal properties, including thermal...
124.

Kinetic and multi-parameter isotherm studies of picric acid removal from aqueous solutions by carboxylated multi-walled carbon nanotubes in the presence and absence of ultrasound

Soheila Gholitabar, Hasan Tahermansouri 한국탄소학회 Carbon Letters 11 Pages

한국탄소학회 Carbon Letters 2017, Vol.22 2 14-24 (11 pages)

Soheila Gholitabar, Hasan Tahermansouri 저
...
- 4,000원
Harkins-Jura, Fowler- Guggenheim), four three-parameter models (Redlich-Peterson, Khan, Radke-Prausnitz, and Toth), two four-parameter equations (Fritz-Schlunder and Baudu) and one five-parameter equation (Fritz-Schlunder). Three error analysis methods, correlation coefficient, chi-square test and average relative errors, were applied to determine the best fit isotherm. The error analysis showed that the models with more than two parameters better described the picric acid sorption data compared...
125.

Disorientation angle influence on the thermal residual stresses in carbon multilayered composite plates of different thicknesses

Olga Bitkina, Ki-Weon Kang, Jang-Ho Lee 한국탄소학회 Carbon Letters 5 Pages

한국탄소학회 Carbon Letters 2017, Vol.21 13 98-102 (5 pages)

Olga Bitkina, Ki-Weon Kang, Jang-Ho Lee 저
...
- 1,500원
One of the most acute problems in studying composite stress-strain states is determining the initial residual stresses during the design of layered construction elements. The full stress?strain state of composite constructions consists of the initial (generated during the manufacturing process) and operating (generated during the working period) stages. A thorough investigation of the initial stage of the stress-strain state is very important to finding the total stresses and deformations, and...
126.

Effect of carbonization temperature on crystalline structure and properties of isotropic pitch-based carbon fiber

Jung Dam Kim, Jae-Seung Roh, Myung-Soo Kim 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2017, Vol.21 6 51-60 (10 pages)

Jung Dam Kim, Jae-Seung Roh, Myung-Soo Kim 저
...
- 3,000원
Isotropic pitch-based fibers produced from coal tar pitch with the melt-blowing method were carbonized at temperatures ranging from 800 to 1600oC to investigate their crystalline structure and physical properties as a function of the carbonization temperature. The in-plane crystallite size (La) of the carbonized pitch fiber from X-ray diffraction increased monotonously by increasing the carbonization temperature resulting in a gradual increase in the electrical conductivity from 169 to 3800...
127.

Yield enhancement of matrix precursor in short carbon fiber reinforced randomly oriented carbon/carbon composite

Thakur Sudesh Kumar Raunija, Sharad Chandra Sharma, Anil Verma 한국탄소학회 Carbon Letters 9 Pages

한국탄소학회 Carbon Letters 2016, Vol.19 7 57-65 (9 pages)

Thakur Sudesh Kumar Raunija, Sharad Chandra Sharma, Anil Verma 저
...
- 3,000원
Isroaniso matrix precursor synthesized from commercially available petroleum pitch was stabilized in air. The influence of oxygen mass gain during stabilization on the yield of matrix precursor was studied. Additionally, the influence of pressure on the yield of the stabilized matrix precursor in a real system was studied. The fourier transform infrared spectrometry (FTIR), thermogravimetric analysis (TGA), yield, yield rate, and yield impact were used to check the effect of stabilization and...
128.

Preparation and characterization of microporous NaOH activated carbons from hydrofluoric acid leached rice husk and its application for lead(II) adsorption

A. F. Hassan, A. M. Youssef 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.1 8 57-66 (10 pages)

A. F. Hassan, A. M. Youssef 저
...
- 3,000원
Three activated carbons (ACs) were prepared using NaOH (N) as an activating agent. Hydrofluoric acid pre-leached rice husk was used as a precursor. After leaching, the precursor was washed with distilled water, dried, crushed, and then sieved; a size fraction of 0.3-0.5 mm was selected for carbonization in the absence of air at 600°C. The carbonization product (LC) was mixed with NaOH at ratios of 1:2, 1:3, and 1:4 (wt of LC: wt of NaOH) and the produced ACs after activation at 800°C were...
129.

Removal of Methylene Blue by Modified Carbon Prepared from the Sambucus Nigra L. plant

MahboobehManoochehri, KhadijehAmooei 한국탄소학회 Carbon Letters 7 Pages

한국탄소학회 Carbon Letters 2013, Vol.14 No.1 4 27-33 (7 pages)

MahboobehManoochehri, KhadijehAmooei 저
- 3,000원
130.

Breakthrough behaviour of NBC canister against carbon tetrachloride: a simulant for chemical warfare agents

Avanish Kumar Srivastava, D. Shah, T. H. Mahato, Beer Singh, A. Saxena, A. K. Verma, S. Shrivastava, 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2012, Vol.13 No.2 6 109-114 (6 pages)

Avanish Kumar Srivastava, D. Shah, T. H. Mahato, Beer Singh, A. Saxena, A. K. Verma, S. Shrivastava, 저
...
- 3,000원

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