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( Corwin Rudly ),유지호,노예은,김수현,김상도,전동혁,최호경,임정환,임영준,이시훈 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Carbon materials such as activated carbon (AC) can be used as a catalyst support because of its large specific area, high porosity, and adjustable pore size and its distribution. In this study, the performance of AC-based nickel catalysts were evaluated on both CO<sub>2</sub> methanation and methanol steam reforming (MSR) process. Those processes play important roles in supporting the shift to renewable energy. ACs were prepared by various conditions of activation process. The study showed that activated carbon supported nickel catalyst used for CO<sub>2</sub> methanation reaction can yield products up to 70% conversion of CO<sub>2</sub> and 65% of CH<sub>4</sub> carbon yield. AC-supported nickel catalyst used for MSR, meanwhile, could facilitate the process to achieve high value on both hydrogen yield (up to 79%) and selectivity of CO<sub>2</sub> (up to 90%). Methane as a side product also has a low selectivity on this process. Various analytical methods such as XRD, BET, and TEM, have also been done in order to support this study.
U.S. GENERATION IV REACTOR INTEGRATED MATERIALS TECHNOLOGY PROGRAM
Corwin William R. Korean Nuclear Society 2006 Nuclear Engineering and Technology Vol.38 No.7
An integrated R&D program is being conducted to study, qualify, and in some cases, develop materials with required properties for the reactor systems being developed as part the U.S. Department of Energy's Generation IV Reactor Program. The goal of the program is to ensure that the materials research and development (R&D) needed to support Gen IV applications will comprise a comprehensive and integrated effort to identify and provide the materials data and its interpretation needed for the design and construction of the selected advanced reactor concepts. The major materials issues for the five primary systems that have been considered within the U.S. Gen IV Reactor Program-very high temperature gas-cooled, supercritical water-cooled, gas-cooled fast spectrum, lead-cooled fast spectrum, and sodium-cooled fast spectrum reactors-are described along with the R&D that has been identified to address them.
Kim, Young-Ha,Kiladis, George N.,Albers, John R.,Dias, Juliana,Fujiwara, Masatomo,Anstey, James A.,Song, In-Sun,Wright, Corwin J.,Kawatani, Yoshio,Lott, Franç,ois,Yoo, Changhyun Copernicus GmbH 2019 Atmospheric Chemistry and Physics Vol.19 No.15
<P>Abstract. Equatorial Kelvin and mixed Rossby-gravity (MRG) waves in the tropical tropopause layer and stratosphere represented in recent reanalyses for the period of 1981-2010 are compared in terms of spectral characteristics, spatial structures, long-term variations, and their forcing of the quasi-biennial oscillation (QBO). For both wave types, the spectral distributions are broadly similar among most of the reanalyses, while the peak amplitudes exhibit considerable spread. The longitudinal distributions and spatial patterns of wave perturbations show reasonable agreement between the reanalyses. A few exceptions to the similarity of the spectral shapes and spatial structures among them are also noted. While the interannual variations of wave activity appear to be coherent for both the Kelvin and MRG waves, there is substantial variability in long-term trends among the reanalyses. Most of the reanalyses which assimilate satellite data exhibit large increasing trends in wave variance (∼15 %-50 % increase in 30 years at 100-10 hPa), whereas one reanalysis (Japanese 55-year Reanalysis assimilating conventional observations only; JRA-55C) produced without satellite data does not. Several discontinuities are found around 1998 in the time series of the Kelvin and MRG wave variances, which manifest in different ways depending on the reanalysis, and are indicative of impacts of the transition of satellite measurements during that year. The equatorial wave forcing of the QBO, estimated by the Eliassen-Palm (EP) flux divergence, occurs in similar phase-speed ranges in the lower stratosphere among the reanalyses. However, the EP flux and its divergence are found to be dependent on the zonal-mean winds represented in reanalyses, exhibiting different magnitudes, altitudes, and phase-speed ranges of the Kelvin wave forcing between the reanalyses, especially at 20-10 hPa. In addition, at around 20 hPa, a wave signal which appears only in easterly mean winds with westward phase speeds is found and discussed. </P>