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이나리,이수선,홍태환 한국수소및신에너지학회 2012 한국수소 및 신에너지학회논문집 Vol.23 No.5
Mg and Mg-based alloys are regarded as strong candidate hydrogen storage materials since their hydrogen capacity exceeds that of known metal hydrides. One of the approaches to improve kinetic is addition of metal oxide. In this paper, we tried to improve the hydrogenation properties of Mg-based hydrogen storage composites. The effect of transition metal oxides, such as Nb2O5 on the kinetics of the Magnesium hydrogen absorption kinetics was investigated. MgHx-5wt.% Nb2O5 composites have been synthesized by hydrogen induced mechanical alloying. The powder fabricated was characterized by X-ray diffraction (XRD), Field Emission-Scanning Electron Microscopy (Fe-SEM), Energy Dispersive X-ray (EDX), BET and simultaneous Thermo Gravimetric Analysis / Differential Scanning Calorimetry (TG/DSC) analysis. The Absorption / desorption kinetics of MgHx-5wt.% Nb2O5 (type I and II) are determined at 423, 473, 523, 573 and 623 K.
Sol-gel법을 이용한 백색도가 높은 가시광 응답형 N-doped TiO<sub>2</sub> 제조 및 특성 평가 연구
이나리,유리,김태관,피재환,김유진,Lee, NaRi,Yu, Ri,Kim, Tae Kwan,Pee, Jae-Hwan,Kim, YooJin 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.6
Nitrogen-doped titanium dioxide (N-doped $TiO_2$) is attracting continuously increasing attention as a material for environmental photocatalysis. The N-atoms can occupy both interstitial and substitutional positions in the solid, with some evidence of a preference for interstitial sites. In this study, N-doped $TiO_2$ is prepared by the sol-gel method using $NH_4OH$ and $NH_4Cl$ as N ion doping agents, and the physical and photocatalytic properties with changes in the synthesis temperature and amount of agent are analyzed. The photocatalytic activities of the N-doped $TiO_2$ samples are evaluated based on the decomposition of methylene blue (MB) under visible-light irradiation. The addition of 5 wt% $NH_4Cl$ produces the best physical properties. As per the UV-vis analysis results, the N-doped $TiO_2$ exhibits a higher visible-light activity than the undoped $TiO_2$. The wavelength of the N-doped $TiO_2$ shifts to the visible-light region up to 412 nm. In addition, this sample shows MB removal of approximately 81%, with the whiteness increasing to +97 when the synthesis temperature is $600^{\circ}C$. The coloration and phase structure of the N-doped $TiO_2$ are characterized in detail using UV-vis, CIE Lab color parameter measurements, and powder X-ray diffraction (XRD).
보관 온도 및 기간에 따른 마황탕 전탕액의 지표 성분 함량, 항염증 및 항산화 활성 비교
이나리,하혜경,신현규,서창섭 한국생약학회 2018 생약학회지 Vol.49 No.2
This study was designed to investigate the stability for chemical contents and biological activities of Mahwang-tang (MT) depending on the preservation temperature and periods. MT decoction pouches were preserved for 3 months at room temperature (RT, 23±1oC) and refrigeration (4oC). To evaluate the stability of MT decoction, pH and sugar content were estimated. High-performance liquid chromatography analysis were performed to quantify the contents of marker compounds in MT. Anti-inflammatory effects of MT were evaluated to suppress the generation of nitric oxide, prostaglandin E2 and cytokines (tumor necrosis factor-a and interleukin-6) in the RAW 264.7 cells stimulated with lipopolysaccharide. Total antioxidant capacity of MT was determined by ABTS radical scavenging activity. The pH of storage method and period showed a tendency to decrease gradually with time. There were no changes in sugar content depending on the preservation temperature and periods of MT decoction. Among the major components of MT, cinnamaldehyde was reduced time-dependently for 3 months of storage at RT. The inflammatory effect and antioxidant capacity of MT were reduced time-dependently at both RT and 4oC. Our results suggest that the preservation period of MT decoction is recommended in refrigeration within 3 months or less rather than at RT.
Cross-cultural Differences in Using English Requests During Synchronous Computer Communication
이나리,황은하 현대영어교육학회 2014 현대영어교육 Vol.15 No.3
The main purpose of this study is to investigate the effects of nationality and gender difference, which are distinctive features in the cross-cultural communication, on the use of request strategies during synchronous computer chatting. In order to describe natural communication requests, 435 tokens were selected from 180 chatting sessions between 172 university students (97 South Koreans and 75 Japanese) are analyzed. The coding scheme from the Cross-Cultural Study of Speech Act Realization Patterns (CCSARP) was modified and applied in order to examine the characteristics of the request tokens. Mood derivable (i.e., imperatives) is observed to be the most popular strategy among the participants. The findings show that nationality affects the preference of using request strategies, whereas gender does not bring about significant differences. In addition, mitigated expressions are explored; the results demonstrate that Japanese students’ reliance on lexical mitigation is stronger than that of Korean students. In terms of pedagogical suggestions, a need of request strategy instruction and vocabulary practice are seen to be required for EFL students in order to promote their abilities to use appropriate requests.
실리카 코팅과 에칭에 의한 α-FeOOH의 색상변화 연구
이나리,유리,김유진,Lee, NaRi,Yu, Ri,Kim, YooJin 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.5
Silica is used in shell materials to minimize oxidation and aggregation of nanoparticles. Particularly, porous silica has gained attention because of its performance in adsorption, catalysis, and medical applications. In this study, to investigate the effect of the density of the silica coating layer on the color of the pigment, we arbitrarily change the structure of a silica layer using an etchant. We use NaOH or $NH_4OH$ to etch the silica coating layer. First, we synthesize ${\alpha}-FeOOH$ for a length of 400 nm and coat it with TEOS to fabricate particles with a 50 nm coating layer. The coating thickness is then adjusted to 30-40 nm by etching the silica layer for 5 h. Four different shapes of ${\alpha}-FeOOH$ with different colors are measured using UV-vis light. From the color changes of the four different shapes of ${\alpha}-FeOOH$ features during coating or etching, the $L^*$ value is observed to increase and brighten the overall color, and the $b^*$ value increases to impart a clear yellow color to the pigment. The brightest yellow color was that coated with silica; if the sample is etched with NaOH or $NH_4OH$, the $b^*$ value can be controlled to study the yellow colors.