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Cristian Aravena,Dongwook Lee,박진원,유윤성 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
Deep eutectic solvents (DESs) prepared by mixing hydrogen bond donors (HBDs) and acceptors (HBAs)are attracting attention to use absorbents for carbon capture, storage, and utilization (CCUS) technology,but their applications in large-scale industries are limited by the scarce research in the field. When DESwas used as CO2 absorbent, the use of appropriate HBAs and HBDs is critical for application. In this study,choline chloride (ChCl, as the HBA) was mixed with five different HBDs and diluted to 20 wt% water (W)for improvement of mass transfer, and their CO2 absorption capacities and physicochemical propertieswere analyzed. Urea (U), ethylene glycol, glycerol, and malic and levulinic acids were used as HBDsdue to their various functional groups. ChCl:U:W can be a potential alternative to conventional alkanolamineabsorbents for use in CCUS among the studied DESs, as its absorption capacity was superiorto those of the other DESs. Increase of surface tension and decrease of density and viscosity wereobserved by addition of water on all of DESs. Additionally, absorption rate increased via water addition. This study can contribute to the future development of a more efficient CCUS technology using solventalternatives that are more suitable for future environmental challenges.
The Impact of Social Networks on the Protests in Chile, Ecuador and Colombia during 2019
Pedro Aravena Lavín 한국라틴아메리카학회 2022 라틴아메리카연구 Vol.35 No.2
This publication examines the existence of the relationship between social networks and participation in demonstrations or protests. The objective is to distinguish the causality of social networks in the demonstrations that occurred during the year 2019 in Chile, Colombia and Ecuador. As a methodology, a binary logistic regression model is used through the data provided by the Latinobarómetro 2020 survey. When performing a comparative analysis, it can be distinguished how Chile is a deviant case when exposing the political factor "political scale of left”, the demographic “age” and communicational or organizational “perception of social networks as an instrument of political participation” as highlights. In addition, the results also call into question the political and socioeconomic impact of demonstrations and protests in Latin American cases.
Dos Hermanos Muy Distintos. El Caso Chileno y Argentino en Perspectiva Comparada
Pedro Aravena Lavin 한국라틴아메리카학회 2012 라틴아메리카연구 Vol.25 No.4
Argentina has one of the highest standards of support for democracy in Latin America despite the economic crises of recent decades. Chile, despite being one of the most economically successful countries in the region, has a poor support for democracy. This article presents a comparison of ordered logistic regression analysis of the year 1997 with the year 2001. In addition, such models are complemented with respect to the political culture in both countries. Economic stability, income distribution, interpersonal trust, interest in politics and civic education are more significant factors in the Argentinean than in the Chilean case. There is a strong polarization between the political orientation of left and right in Chile with regard to the support of democracy.
La Economía Afecta Nuestra Salud Emocional
Pedro Aravena Lavin 한국라틴아메리카학회 2014 라틴아메리카연구 Vol.27 No.3
Background: This paper examines the existence of a relationship between economic factors and emotional health in three Latin American countries in 2001.Objective: The aim of this study was to establish if there was a regression coefficient between economic factors and emotional health of the respective populations of Argentina, Chile and Ecuador during the economic crisis of 2001. Material and Methods: Data was collected from the 2001 Latinobarometer survey and a binomial logistical regression analysis model applied. Argentina, Chile and Ecuador were selected as case studies due to contrasting levels of economic growth in the three countries in the year 2001, namely negative economic growth in Argentina, positive economic growth in Ecuador and a relatively stable level of growth in Chile. Results: In a sample of three Latin American countries, there was a strong relationship between economic factors and the emotional health. Discussion: Economic factors are constantly affecting the emotional health of the population in Latin America. The economic crisis will not determine this relationship.
GLOBULAR CLUSTER POPULATIONS: RESULTS INCLUDING S<sup>4</sup>G LATE-TYPE GALAXIES
Zaritsky, Dennis,McCabe, Kelsey,Aravena, Manuel,Athanassoula, E.,Bosma, Albert,Comeró,n, Sé,bastien,Courtois, Helene M.,Elmegreen, Bruce G.,Elmegreen, Debra M.,Erroz-Ferrer, Santiago,Gadot American Astronomical Society 2016 The Astrophysical journal Vol.818 No.1
<P>Using 3.6 and 4.5 mu m images of 73 late-type, edge-on galaxies from the S(4)G survey, we compare the richness of the globular cluster populations of these galaxies to those of early-type galaxies that we measured previously. In general, the galaxies presented here fill in the distribution for galaxies with lower stellar mass, M-*, specifically log(M-*/M-circle dot) < 10, overlap the results for early-type galaxies of similar masses, and, by doing so, strengthen the case for a dependence of the number of globular clusters per 10(9)M(circle dot) of galaxy stellar mass, T-N, on M-*. For 8.5 < log(M-*/M-circle dot) < 10.5 we find the relationship can be satisfactorily described as T-N = (M-*/10(6.7))(-0.56) M-* is expressed in solar masses. The functional form of the relationship is only weakly constrained, and extrapolation outside this range is not advised. Our late-type galaxies, in contrast to our early types, do not show the tendency for low-mass galaxies to split into two T-N families. Using these results and a galaxy stellar mass function from the literature, we calculate that, in a volume-limited, local universe sample, clusters are most likely to be found around fairly massive galaxies (M-* similar to 10(10.8)M(circle dot)) and present a fitting function for the volume number density of clusters as a function of parent-galaxy stellar mass. We find no correlation between T-N and large-scale environment, but we do find a tendency for galaxies of fixed M-* to have larger T-N if they have converted a larger proportion of their baryons into stars.</P>
The new teaching career policy in Chile: Perspectives from school principals
Marta Quiroga,Felipe Aravena 한국교육개발원 2018 KEDI Journal of Educational Policy Vol.15 No.2
In the Chilean educational context emerges a new policy as a system of professional teacher development called the New Teaching Career Law which will be implemented in 2017. This study aims to investigate from the perspective of school principals (n=173), the impact of the organizational, relational, and individual dynamics of the New Teaching Career Law. The study employed a mixed-method research design using a descriptive-exploratory approach. The results of this study suggest that the process of teacher sorting considers the following points the most important elements in evaluating a teacher’s performance: experience, continuous professional development, and results of the teacher evaluation portfolio. However, principals do express doubt regarding the relationship between the categorization obtained by teachers and the effectiveness of them in the school context.
Aspen Plus를 활용한 해수유래 물질기반 이산화탄소 포집 공정 설계
최원용 ( Won Yong Choi ),( Cristian Aravena ),장규민 ( Kyumin Jang ),이동욱 ( Dongwook Lee ),김인준 ( Injun Kim ),유윤성 ( Yunsung Yoo ),박진원 ( Jinwon Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
산업혁명 이후 화석연료의 끊임없는 연소로 인한 온실가스 배출로 인해 지구의 평균 기온은 1℃ 이상 상승하였으며, 이러한 기후 변화에 대응하기 위해 Carbon Capture and Utilization(CCU) 기술에 대한 수요는 증가되고 있다. 본 연구에서는 담수화 공정 폐수를 사용하여 폐수 및 대기 오염물질에 대한 동시 처리 프로세스를 제안하고 그 성능을 평가하였다. 담수화폐수는 Mg<sup>2+</sup>와 Ca<sup>2+</sup>이온의 함량이 높아 CCU 기술 적용 시 안정적인 금속이온의 공급원으로서 활용이 가능하여, 해수 유래물질의 전기분해를 통해 배출되는 이산화탄소 중 90% 이상을 탄산 및 중탄산 등 이온성 이산화탄소의 형태로 포집하였다. 염전폐수에 존재하는 금속 양이온은 pH swing을 통해 추출하였으며, 이를 통해 CO<sub>2</sub>포화 흡수제를 재생하고 금속 탄산염을 생성하였다. 전기분해 시뮬레이션은 MATLAB 2020a에서 실행되었으며, 탄산화 프로세스는 ASPEN PLUS를 통해 모델링하였다. 결과적으로, Ca의 경우 99%가 탄산칼슘으로 Mg는 60%가 탄산마그네슘으로 전환되었다. 시뮬레이션 툴을 활용하여 제안된 공정의 경제를 평가하였으며, 운용비용과 전력 가격의 상관관계를 확인하였다. 본 연구에서 제안된 공정을 통해 이산화탄소 광물 탄산화기술의 상용화에 있어 한 단계 발전하는 초석이 될 것으로 기대되며, 지속가능한 연구를 통해 지구 온난화 문제 완화의 기여할 것으로 생각된다.
시뮬레이션을 이용한 해수 전기분해 기반 CO<sub>2</sub> 포집 및 광물 탄산화 연구
최원용 ( Wonyong Choi ),강동우 ( Dongwoo Kang ),유윤성 ( Yunsung Yoo ),( Cristian Aravena ),박진원 ( Jinwon Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회 추계학술발표논문집 Vol.2020 No.-
국내의 이산화탄소 배출량은 국제에너지기구(IEA, 2017)기준 세계에서 7번째로 높으며, 지속적인 증가 추세에 있으며, 이에 대응하기 위해 이산화탄소 배출 감소 기술인 CCU(carbon capture and utilization) technology의 적용이 고려되고 있다. 보편적인 CCU 습식흡수법에서 사용되는 아민계 흡수제를 통한 CO<sub>2</sub> 포집기술은 운용에 필요한 에너지 요구량이 큰 기술이기에, 효율적이고 경제적인 운용을 위한 개선이 요구되고 있다. 이에 본 연구에서는 정제소금 생산공정 부산물인 해수농축폐수의 전기분해로 인해 생성되는 알칼리 포집전환 용액을 통한 이산화탄소 포집 기술 공정의 경제성을 검증하였다. Matlab 프로그램을 활용하여 전기분해에 필요한 전력량을 계산하였으며, Aspen Plus 프로그램을 통해 흡수탑 공정 및 해수 내 잔존하는 금속이온들과 반응하여 CaCO<sub>3</sub> 및 MgCO<sub>3</sub>를 생성하는 광물탄산화공정의 Simulation을 진행하였다. 또한 Sensitivity Analysis를 통해 최적의 흡수제 및 공정 최적화를 이루는 운전조건을 도출하였으며 이를 바탕으로 해수 기반 이산화탄소 포집 및 광물화 공정의 타당성을 확인하였다.