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Evaluation of an erosion-sediment transport model for a hillslope using laboratory flume data

Journal of Arid Land 2014年第6期6卷 647-655页

作者： Anya Catherine CARGUELLES minjae jung Kristine Joy BMALLARI Gijung PAK Hafzullah AKSOY Levent M KAVVAS Ebru ERIS JaeYoung YOON YoungJoon LEE SeonHwa HONG Department of Environmental Engineering Korea University Sejong 339-700Korea Program in Environmental Technology and Policy Korea University Sejong 339-700Korea Department of Civil Engineering Istanbul Technical University Maslak 34469IstanbulTurkey Department of Civil and Environmental Engineering University of California DavisCalifornia 95616USA Department of Civil Engineering Ege University Bornova 35100IzmirTurkey Geum-River Environment Research Center National Institute of Environmental Research OkcheonChungbuk 373-804Korea

Climate change can escalate rainfall intensity and cause further increase in sediment transport in arid lands which in turn can adversely affect water quality. Hence, there is a strong need to predict the fate of sediments in order to provide measures for sound erosion control and water quality management. The presence of micro- topography on hillslopes influences processes of runoff generation and erosion, which should be taken into account to achieve more accurate modelling results. This study presents a physically based mathematical model for erosion and sediment transport coupled to one-dimensional overland flow equations that simulate rainfall-runoff generation on the rill and interrill areas of a bare hillslope. Modelling effort at such a fine resolution considering the flow con- nection between Jnterrill areas and rills is rarely verified. The developed model was applied on a set of data gath- ered from an experimental setup where a 650 cm×136 cm erosion flume was pre-formed with a longitudinal rill and interrJll having a plane geometry and was equipped with a rainfall simulator that reproduces natural rainfall characteristics. The flume can be given both longitudinal and lateral slope directions. For calibration and validation, the model was applied on the experimental results obtained from the setup of the flume having 5% lateral and 10% longitudinal slope directions under rainfall intensities of 105 and 45 mm/h, respectively. Calibration showed that the model was able to produce good results based on the R2 （0.84） and NSE （0.80） values. The model performance was further tested through validation which also produced good statistics （R2=0.83, NSE=0.72）. Results in terms of the sedigraphs, cumulative mass curves and performance statistics suggest that the model can be a useful and an important step towards verifying and improving mathematical models of erosion and sediment transport.

关键词： climate change erosion rill and interrill physically based model sediment transport

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Optimal Age Replacement Policy with Replacement Occurrence While the Warranty is in Effect

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Journal of Shanghai Jiaotong university(Science) 2015年第3期20卷 374-379页

作者： PARK minjae jung Ki Mun PARK Dong Ho College of Business Administration Hongik University Department of Informational Statistics Kyungsung University Industry Academic Cooperation Foundation Hallym University

This study considers an age replacement policy(ARP) for a repairable product with an increasing failure rate with and without a product warranty. As for the warranty policy to consider in association with such an age replacement policy, we adapt a renewable minimal repair-replacement warrant(MRRW) policy with 2D factors of failure time of the product and its corresponding repair time. The expected cost rate during the life cycle of the product is utilized as a criterion to find the optimal policies for both with and without the product warranty. We determine the optimal replacement age that minimizes the objective function which evaluates the expected cost rate during the product cycle and investigate the impact of several factors on the optimal replacement age. The main objective of this study lies on the generalization of the classical age replacement policy to the situation where a renewable warranty depending on 2D factors is in effect. We present some interesting observations regarding the effect of relevant factors based on numerical analysis.

关键词： age replacement policy(ARP) expected cost rate failure times renewable minimal repairreplacement warranty(MRRW) warranty servicing times

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Liquid-like adsorbent assembled by CNTs: Serving as renewable CO_(2) capture materials for indoor air

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Journal of Energy Chemistry 2021年第12期30卷 574-584,I0014页

作者： Jae Won Lee minjae Kim Han Sol jung Ronghuan Xu Seonggon Kim Yong Tae Kang School of Mechanical Engineering Korea UniversitySeoul 02841South Korea

In this study,a CO_(2) capture material in the form of liquid-like adsorbents(LLAs) is developed to overcome the limitations of conventional types of *** increase in indoor activities necessitates the capture of CO_(2) in enclosed indoor *** spaces require safe and stable materials for CO_(2) capture because humans are present in these *** adsorbents are mainly used because liquid absorbents are unsuitable owing to noise and scattering *** LLA,the liquid absorbent assembled by carbon nanotubes(CNTs) is solidified and prevented from flowing and scattering *** present to maintain 95% of initial capacity after recycling 20 times,and have characteristics that can be regenerated in a low temperature heat source(80 to 120℃) and moisture *** work not only provides indoor useable CO_(2) capture materials,but also offers a new prospect in the field of adsorbents.

关键词： CO_(2)capture CNT Silicone oil Adsorbents Indoor air

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Photonic structures in radiative cooling

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Light(Science & Applications) 2023年第7期12卷 1187-1215页

作者： minjae Lee Gwansik Kim Yeongju jung Kyung Rok Pyun Jinwoo Lee Byung-Wook Kim Seung Hwan Ko Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Electronic Device Research Team Hyundai Motor Group37Cheoldobangmulgwan-roUiwang-siGyeonggi-do 16082South Korea E-drive Materials Research Team Hyundai Motor Group37Cheoldobangmulgwan-roUiwang-siGyeonggi-do 16082South Korea Department of Mechanical Robotics and Energy EngineeringDongguk University30 pildong-ro 1-gilJung-guSeoul 04620South Korea. Department of Civil Engineering and Engineering Mechanics Columbia UniversityNew YorkNY 10027USA. Institute of Advanced Machinery and Design(SNU-IAMD)/lnstitute of Engineering Research Seoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea

Radiative cooling is a passive cooling technology without any energy consumption,compared to conventional cooling technologies that require power sources and dump waste heat into the *** decades,many radiative cooling studies have been introduced but its applications are mostly restricted to nighttime use ***,the emergence of photonic technologies to achieves daytime radiative cooling overcome the performance *** example,broadband and selective emissions in mid-IR and high reflectance in the solar spectral range have already been *** review article discusses the fundamentals of thermodynamic heat transfer that motivates radiative *** photonic structures such as multilayer,periodical,random;derived from nature,and associated design procedures were thoroughly *** integration with new functionality significantly enhances the effciency of radiative cooling technologies such as colored,transparent,and switchable radiative cooling applications has been *** commercial applications such as reducing cooling loads in vehicles,increasing the power generation of solar cells,generating electricity,saving water,and personal thermal regulation are also ***,perspectives on radiative cooling and emerging issues with potential solution strategies are discussed.

关键词： radiative overcome transparent

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Oxygen vacancy engineering for tuning the catalytic activity of LaCoO_(3) perovskite

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Journal of Rare Earths 2024年第3期42卷 506-514,I0003页

作者： Jeong Hyun Cho minjae Kim Inchan Yang Kyung Tae Park Chang Houn Rhee Hai Woong Park Ji Chul jung Department of Chemical Engineering Myongji UniversityYongin 17058Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and TechnologyWanju-gunJeollabuk-do 55324Republic of Korea Iron&Steel Process Engineering Research Group POSCOPohang 37859Republic of Korea Hydrogen Research Center Research Institute of Industrial Science&Technology(RIST)Pohang 37673Republic of Korea

Herein, we attempted to engineer oxygen vacancies on the surface of LaCoO_(3) perovskite through simple post-treatments(acid or reductive thermal treatments). Acid treatment induces oxygen vacancies through the selective etching of the La cations, whereas thermal treatment in a reducing atmosphere generates oxygen vacancies by directly removing lattice oxygen. The characterization results confirm that the number of surface oxygen vacancies, which are crucial in various catalytic oxidation reactions,considerably increases in the LaCoO_(3) catalysts treated with acid or reducing gas. Acid treatment enriches the oxygen vacancies while maintaining the structure of the LaCoO_(3) catalysts, which can not be achieved through reductive thermal treatment. Therefore, the acid treatment is considered a promising technique for oxygen vacancy engineering of perovskite catalysts for tuning their catalytic activities. Furthermore,the catalytic activities of the posttreated LaCoO_(3) catalysts for CO oxidation were evaluated and are noted to be considerably better than those of the pristine LaCoO_(3) catalyst due to their abundant oxygen vacancies. Consequently, we conclude that the oxygen vacancies of perovskite catalysts can be effectively engineered via two simple methods and play a significant role in CO oxidation.

关键词： LaCoO_(3)perovskite Acid treatment Reductive thermal treatment Oxygen vacancy CO oxidation Rare earths

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