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The role of mechanical stratigraphy in the lateral variations of thrust development along the central Alberta Foothills, Canada

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Geoscience Frontiers 2018年第5期9卷 1451-1464页

作者： hyunjung lee Yirang Jang Sanghoon Kwon Myong-Ho Park Gautam Mitra Department of Earth System Sciences Yonsei University Geology & Geophysics Department POSCO DAEWOO Corp. Geological Research Division Korea Institute of Geoscience and Mineral Resources Department of Earth and Environmental Sciences University of Rochester

Fold-thrust belts generally exhibit significant variations in structural styles such as differences in thrust geometries and frequencies in imbrication. A natural laboratory of this pattern is preserved in the central Alberta Foothills of the Canadian Rockies, where differences in thrust geometries are represented by the existence vs. non-existence of triangle zones. To seek the factors that make this difference in these regions in terms of structural geometry, stratigraphic thickness variations and mechanical stratigraphy of the sedimentary layers, structural interpretation is conducted based on admissible cross-sections and well log interpretations. In northern region, a backthrust is detached from an incompetent layer(*** Unit of the Wapiabi Formation), which gets thinner from the Foothills to the Plains, indicating that it is developed where the shale layers are pinched out where triangle zone is developed. Backthrust is also developed in the southern region, where mechanical strengths of strata(viz. Bearpaw Formation)increase toward the foreland. In the central region, however, only forethrusts are developed along the weak continuous decollement layers(viz. Turner Valley and Brazeau formations), forming an imbricate fan without development of the triangle zone. Incompetent layers such as the top Wapiabi(Nomad),Brazeau(Bearpaw), Coalspur and Paskapoo formations are also pinched out laterally, forming fault glide horizons in different stratigraphic levels in each region. These results indicate that, along the transport direction, triangle zone is developed in relation to the stratigraphic pinch out of the Nomad Unit in the northern region, and is formed associated with the variations in strengths of the layers constituting the Bearpaw Formation in the southern region. It is notable that all the glide horizons are developed along incompetent layers. However, triangle zones are not developed in the areas of continuous stratigraphy of the Nomad Unit, which doe

关键词： Mechanical stratigraphy Triangle zone Imbricate fan Central Alberta Foothills Canadian rockies

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Aggregation induced edge sites actuation of 3D MoSe_(2)/rGO electrocatalyst for high-performing water splitting system

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Aggregate 2024年第2期5卷 188-200页

作者： Gnanaprakasam Janani Subramani Surendran Dong-Kyu lee Sathyanarayanan Shanmugapriya hyunjung lee Yuvaraj Subramanian Uk Sim Hydrogen Energy Technology Laboratory Korea Institute of Energy Technology(KENTECH)NajuJeonnamRepublic of Korea Department of Chemistry University of UlsanDoowang-dongNam-guUlsanRepublic of Korea Research Institute NEEL SciencesINC.NajuRepublic of Korea Center for Energy Storage System Chonnam National UniversityGwangjuRepublic of Korea

2D materials are regarded as promising electrocatalysts for water splitting because of their advances in providing ample active sites and improving electrochemical reaction kinetics.2D MoSe_(2)has a greater intrinsic electrical conductivity and lower Gibbs free energy for reactant ***,there is still room for improvement in the electrocatalytic performance of MoSe_(2)for high-performance electrochemical water splitting ***,the in situ preparation of heterostructure made of covalently bonded MoSe_(2)and rGO is *** obtained electrocatalyst contains the aggregated 3D structured MoSe_(2)over rGO,which is covalently bonded together with more edge *** active edge sites of MoSe_(2)/rGO are dynamically involved in the electrocatalytic activity while facilitating electron ***,the MoSe_(2)/rGO heterostructure requires a low cell voltage of 1.64 V to reach 100 mA cm^(−2)in water splitting with high reaction *** aggregated MoSe_(2)over rGO with more edge sites exposed by the 3D structure of MoSe_(2)and the interfacial covalent bond in between them provides a favorable electronic structure for the HER and OER with low overpotentials and high current densities and enhances the stability of the *** work presents an attractive and cost-effective electrocatalyst suitable for industrial-scale hydrogen fuel production.

关键词： 3D/2D heterostructures aggregation covalent bond edge sites hydrogen production MoSe_(2) rGO

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Inhibitory effect of Cyrtomium falcatum on melanogenesis in α-MSH-stimulated B16F10 murine melanoma cells

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Asian Pacific Journal of Tropical Biomedicine 2023年第9期13卷 403-410页

作者： Xian-Rong Zhou Jung Hwan Oh Fatih Karadeniz hyunjung lee Hyo Eun Kim Migeon Jo Youngwan Seo Chang-Suk Kong Department of Bioscience Silla UniversityBusan 46958Korea Collaborative Innovation Center for Child Nutrition and Health Development Chongqing University of EducationChongqing 400067China Marine Biotechnology Center for Pharmaceuticals and Foods Silla UniversityBusan 46958Korea Nutritional Education Graduate School of EducationSilla UniversityBusan 46958Korea Department of Food and Nutrition Silla UniversityBusan 46958Korea Division of Convergence on Marine Science Korea Maritime and Ocean UniversityBusan 49112Korea

Objective:To explore the anti-melanogenic potential of Cyrtomium ***:The effects of Cyrtomium falcatum crude extract and its solvent fractions on tyrosinase activity,melanin content,and the expressions of melanogenesis-related genes and proteins were analyzed inα-melanocyte-stimulating hormone(α-MSH)-stimulated B16F10 ***:α-MSH treatment significantly increased tyrosinase activity,and extracellular and intracellular melanin content,as well as the expression levels of tyrosinase,microphthalmia-associated transcription factor(MITF),tyrosinase-related protein(TRP)-1,and TRP-2 in B16F10 *** with Cyrtomium falcatum crude extract and its solvent fractions reduced tyrosinase activity and extracellular and intracellular melanin content and downregulated the expression levels of tyrosinase,MITF,TRP-1,and TRP-2 in a dose-dependent ***:Cyrtomium falcatum has potential anti-melanogenesis effects and can be used as a potential source material in cosmeceutical industry for the research and development of novel lead molecules with whitening properties.

关键词： Cyrtomium falcatum Melanogenesis α-MSH B16F10 melanoma cells

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V_(2)O_(3)/VN electrocatalysts with coherent heterogeneous interfaces for selecting low-energy nitrogen reduction pathways

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SusMat 2024年第4期4卷 90-103页

作者： Tae-Yong An Chengkai Xia Minyeong Je hyunjung lee Seulgi Ji Min-Cheol Kim Subramani Surendran Mi-Kyung Han Jaehyoung Lim Dong-Kyu lee Joon Young Kim Tae-Hoon Kim Heechae Choi Jung Kyu Kim Uk Sim Hydrogen Energy Technology Laboratory Korea Institute of Energy Technology(KENTECH)NajuRepublic of Korea School of Chemical Engineering Sungkyunkwan University(SKKU)SuwonRepublic of Korea Materials&Chemistry Group Institute of Inorganic ChemistryUniversity of CologneCologneGermany Department of Polymer Engineering Graduate SchoolAlan G.MacDiarmid Energy Research Institute&School of Polymer Science and EngineeringChonnam National UniversityGwangjuRepublic of Korea Research Institute NEEL SciencesJeollanamdoRepublic of Korea Department of Materials Science and Engineering Chonnam National UniversityGwangjuRepublic of Korea Department of Chemistry Xi’an Jiaotong-Liverpool UniversitySuzhouChina

Electrochemical nitrogen reduction reaction(NRR)is a sustainable alterna-tive to the Haber-Bosch process for ammonia(NH3)***,the significant uphill energy in the multistep NRR pathway is a bottleneck for favorable serial *** overcome this challenge,we designed a vanadium oxide/nitride(V_(2)O_(3)/VN)hybrid electrocatalyst in which V_(2)O_(3)and VN coex-ist coherently at the heterogeneous *** single-phase V_(2)O_(3)and VN exhibit different surface catalytic kinetics for NRR,the V_(2)O_(3)/VN hybrid elec-trocatalyst can provide alternating reaction pathways,selecting a lower energy pathway for each material in the serial NRR *** a result,the ammo-nia yield of the V_(2)O_(3)/VN hybrid electrocatalyst was 219.6µg h^(-1)cm^(-2),and the Faradaic efficiency was 18.9%,which is much higher than that of single-phase VN,V_(2)O_(3),and VNxOy solid solution catalysts without *** functional theory calculations confirmed that the composition of these hybrid electrocatalysts allows NRR to proceed from a multistep reduction reaction to a low-energy reaction pathway through the migration and adsorption of interme-diate ***,the design of metal oxide/nitride hybrids with coherent heterointerfaces provides a novel strategy for synthesizing highly efficient elec-trochemical catalysts that induce steps favorable for the efficient low-energy progression of NRR.

关键词： coherent heterogeneous interfaces green ammonia synthesis hybrid electrocatalyst low-energy progression nitrogen reduction reaction(NRR) vanadium oxide/nitride(V_(2)O_(3)/VN)

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TiO2 nanotube branched tree on a carbon nanofiber nanostructure as an anode for high energy and power lithium ion batteries

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Nano Research 2014年第4期7卷 491-501页

作者： Taeseup Song Hyungkyu Han Heechae Choi Jung Woo lee hyunjung Park Sangkyu lee Won II Park Seungchul Kim Li Liu Ungyu Paik Department of Materials Science Engineering Hanyang University Seou113 3-791 Korea Center for ComputationalScience Korea Institute of Science and Technology Seou1136-791 Korea School of Chemistry Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education Xiangtan University Xiangtan 411105 China

The inherently low electrical conductivity of TiO2-based electrodes as well as the high electrical resistance between an electrode and a current collector represents a major obstacle to their use as an anode for lithium ion batteries. In this study, we report on high-density TiO2 nanotubes （NTs） branched onto a carbon nanofiber （CNF）＂tree＂ that provide a low resistance current path between the current collector and the TiO2 NTs. Compared to a TiO2 NT array grown directly on the current collector, the branched TiO2 NTs tree, coupled with the CNF electrode, exhibited -10 times higher areal energy density and excellent rate capability （discharge capacity of -150 mA.h.g-1 at a current density of 1,000 mA·g-1）. Based on the detailed experimental results and associated theoretical analysis, we demonstrate that the introduction of CNFs with direct electric contact with the current collector enables a significant increase in areal capacity （mA·h·cm-2） as well as excellent rate capability.

关键词： titanium dioxide carbon nanofibers areal capacity lithium ion batteries

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Passivating contact-based tunnel junction Si solar cells using machine learning for tandem cell applications

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Energy and AI 2023年第4期14卷 550-558页

作者： hyunjung Park Audrey Morisset Munho Kim Hae-Seok lee Aicha Hessler-Wyser Franz-Josef Haug Christophe Ballif Photovoltaics and Thin Film Electronics Laboratory(PV-Lab) EPFLSchool of Engineering(STI)Maladière 71bNeuchâtelCH-2000Switzerland School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang Avenue639798SingaporeSingapore Graduate School of Energy and Environment(KU-KIST Green School) Korea University145Anam-roSeongbuk-gu02841SeoulRepublic of Korea

Tandem solar cells are a key technology for exceeding the theoretical efficiency limit of single-junction *** of the most promising combinations is the silicon–perovskite tandem cells,considering their potential for high efficiency,fabrication on a large scale,and low *** most research focuses on improving each subcell,another key challenge lies in the tunnel junction that connects these subcells,significantly impacting the overall cell ***,we demonstrate the first use of tunnel junctions using a stack of p+/n+polysilicon passivating contacts deposited directly on the tunnel oxide to overcome the drawbacks of conventional metal oxide-based tunnel junctions,including low tunneling efficiency and sputter *** Random Forest analysis,we achieved high implied open circuit voltages over 700 mV and low contact resistivities of 500 mΩcm 2,suggesting fill factor losses of less than 1%abs for the operating conditions of a tandem cell.

关键词： Tunnel junction Tandem Passivating contact Solar cell Machine learning

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One-step printable platform for high-efficiency metasurfaces down to the deep-ultraviolet region

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Light(Science & Applications) 2023年第4期12卷 551-557页

作者： Joohoon Kim Wonjoong Kim Dong Kyo Oh hyunjung Kang Hongyoon Kim Trevon Badloe Seokwoo Kim Chanwoong Park Hojung Choi Heon lee Junsuk Rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea NationallInstitute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

A single-step printable platform for ultraviolet(UV)metasurfaces is introduced to overcome both the scarcity of low-loss UV materials and manufacturing limitations of high cost and low *** dispersing zirconium dioxide(ZrO_(2))nanoparticles in a UV-curable resin,ZrO_(2)nanoparticle-embedded-resin(nano-PER)is developed as a printable material which has a high refractive index and low extinction coefficient from near-UV to *** ZrO_(2)nano-PER,the UV-curable resin enables direct pattern transfer and ZrO_(2)nanoparticles increase the refractive index of the composite while maintaining a large *** this concept,UV metasurfaces can be fabricated in a single step by nanoimprint *** a proof of concept,UV metaholograms operating in near-UV and deep-UV are experimentally demonstrated with vivid and clear holographic *** proposed method enables repeat and rapid manufacturing of UV metasurfaces,and thus will bring UV metasurfaces more close to real life.

关键词： resin high enable

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Time-course pattern of neuronal loss and gliosis in gerbil hippocampi following mild, severe, or lethal transient global cerebral ischemia

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Neural Regeneration Research 2019年第8期14卷 1394-1403页

作者： Tae-Kyeong lee hyunjung Kim Minah Song Jae-Chul lee Joon Ha Park Ji Hyeon Ahn Go Eun Yang Hyeyoung Kim Taek Geun Ohk Myoung Cheol Shin Jun Hwi Cho Moo-Ho Won Depart merit of Neurobiology School of Medici ne Kangw on National University Chuncheon Gangwon Republic of Korea Department of Biomedical Science and Research Institute for Bioscience and Biotechnology Hallym University Chuncheon Gangwon Republic of Korea Department of Radiology Kangwon National University Hospital Chuncheon Gangxvon Republic of Korea Department of Anesthesiology and Pain Medicine Chungju Hospital Konkuk University School of Medicine Chungju Chungcheongbuk Republic of Korea Department of Emergency Medicine School of Medicine Kangwon National University Chuncheon Gangwon Republic of Korea

Transient ischemia in the whole brain leads to neuronal loss/death in vulnerable brain regions. The striatum, neocortex and hippocampus selectively loose specific neurons after transient ischemia. Just 5 minutes of transient ischemia can cause pyramidal neuronal death in the hippocampal cornu ammonis (CA) 1 field at 4 days after transient ischemia. In this study, we investigated the effects of 5-minute (mild), 15-minute (severe), and 20-minute (lethal) transient ischemia by bilateral common carotid artery occlusion (BCCAO) on behavioral change and neuronal death and gliosis (astrocytosis and microgliosis) in gerbil hippocampal subregions (CA1-3 region and dentate gyrus). We performed spontaneous motor activity test to evaluate gerbil locomotor activity, cresyl violet staining to detect cellular distribution, neuronal nuclei immunohistochemistry to detect neuronal distribution, and Fluoro-Jade B histofluorescence to evaluate neuronal death. We also conducted immunohistochemical staining for glial fibrillary acidic protein and ionized calcium-binding adapter molecule 1 (Ibal) to evaluate astrocytosis and microgliosis, respectively. Animals subjected to 20-minute BCCAO died in at least 2 days. BCCAO for 15 minutes led to pyramidal cell death in hippocampal CA1-3 region 2 days later and granule cell death in hippocampal de匚tate gyrus 5 days later. Similar results were not found in animals subjected to 5-minute BCCAO. Gliosis was much more rapidly and severely progressed in animals subjected to 15-minute BCCAO than in those subjected to 5- minute BCCAO. Our results indicate that neuronal loss in the hippocampal formation following transient ischemia is significantly different according to regions and severity of transient ischemia. The experimental protocol was approved by Institutional Animal Care and Use Committee (AICUC) of Kangwon National University (approval No. KW-180124-1) on May 22, 2018.

关键词： transient global brain ischemia delayed neuronal death glial activation ischemic duration hippocampus spontaneous motor activity Mongolian gerbil histology neural regeneration

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Pretreatment of Populus tomentiglandulosa protects hippocampal CA1 pyramidal neurons from ischemia-reperfusion injury in gerbils via increasing SODs expressions and maintaining BDNF and IGF-I expressions

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Chinese Journal of Natural Medicines 2019年第6期17卷 424-434页

作者： Tae-Kyeong lee Joon Ha Park Ji Hyeon Ahn hyunjung Kim Minah Song Jae-Chul lee Jong Dai Kim Yong Hwan Jeon Jung Hoon Choi Choong Hyun lee In Koo Hwang YAN Bing-Chun Moo-Ho Won Il Jun Kang Department of Neurobiology School of MedicineKangwon National UniversityChuncheon 24341Republic of Korea Department of Biomedical Science Research Institute of Bioscience and BiotechnologyHallym UniversityChuncheon 24252Republic of Korea Division of Food Biotechnology School of BiotechnologyKangwon National UniversityChuncheon 24341Republic of Korea Department of Radiology School of MedicineKangwon National UniversityChuncheon 24289Republic of Korea Department of Anatomy College of Veterinary MedicineKangwon National UniversityChuncheon 24341Republic of Korea Department of Pharmacy College of PharmacyDankook UniversityCheonan 31116Republic of Korea Department of Anatomy and Cell Biology College of Veterinary Medicine and Research Institute for Veterinary ScienceSeoul National UniversitySeoul 08826Republic of Korea Jiangsu Key Laboratory of Integrated Traditional Chinese Western Medicine for Prevention and Treatment of Senile DiseasesYangzhou 225001China Department of Food Science and Nutrition Hallym UniversityChuncheon 24252Republic of Korea

To examine the effects of Populus tomentiglandulosa(PT) extract on the expressions of antioxidant enzymes and neurotrophic factors in the cornu ammonis 1(CA1) region of the hippocampus at 5 min after inducing transient global cerebral ischemia(TGCI) in gerbils, TGCI was induced by occlusion of common carotid arteries for 5 min. Before ischemic surgery, 200 mg·kg–1 PT extract was orally administrated once daily for 7 d. We performed neuronal nuclear antigen immunohistochemistry and Fluoro-Jade B staining. Furthermore, we determined in situ production of superoxide anion radical, expression levels of SOD1 and SOD2 as antioxidant enzymes and brain-derived neurotrophic factor(BDNF) and insulin-like growth factor I(IGF-I) as neurotrophic factors. Pretreatment with 200 mg·kg–1 PT extract prevented neuronal death(loss). Furthermore, pretreatment with 200 mg·kg–1 PT extract significantly inhibited the production of superoxide anion radical, increased expressions of SODs and maintained expressions of BDNF and IGF-I. Such increased expressions of SODs were maintained in the neurons after IRI. In summary, pretreated PT extract can significantly increase levels of SODs and protect the neurons against TGCI, suggesting that PT can be a useful natural agent to protect against TGCI.

关键词： Transient global cerebral ischemia Populus tomentiglandulosa Neuroprotective effects Antioxidant enzymes

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In vivo inhibitory effect of gaseous chlorine dioxide against infection of Rhizopus oryzaeonsweetpotato

In vivo inhibitory effect of gaseous chlorine dioxide agains...

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中国菌物学会2016年学术年会

作者： Ye Ji lee Yoo Jun Kim hyunjung Jin Wook Kim Ki Doek Kim Laboratory of Plant Disease and Biocontrol College of Life Sciences and BiotechnologyKorea University Department of Biosystems and Biotechnology Korea University

＜正＞Sweetpotato（Ipomoea batatas Lam.）is one of the important food crops and its consumption is increasing in Korea;thus,managing postharvestdiseases on sweetpotato is getting more *** objective of this study was to assessin vivoinhibitory effect ofgaseous chlorine dioxide（Cl O2）against Rhizopus oryzae SP-r1 on *** previous in vitro tests,we

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