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Tailoring local structures of atomically dispersed copper sites for highly selective CO_(2) electroreduction

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Carbon Energy 2024年第4期6卷 79-90页

作者： Kyung‐Jong Noh Byoung Joon Park Ying Wang Yejung Choi Sang‐Hoon You Yong‐Tae Kim Kug‐Seung Lee Jeong woo Han Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)PohangGyeongbukRepublic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)PohangGyeongbukRepublic of Korea Pohang Accelerator Laboratory(PAL) Beamline DivisionPohangGyeongbukRepublic of Korea

Atomically‐dispersed copper sites coordinated with nitrogen‐doped carbon(Cu–N–C)can provide novel possibilities to enable highly selective and active electrochemical CO_(2) reduction ***,the construction of optimal local electronic structures for nitrogen‐coordinated Cu sites(Cu–N_(4))on carbon remains ***,we synthesized the Cu–N–C catalysts with atomically‐dispersed edge‐hosted Cu–N_(4) sites(Cu–N_(4)C_(8))located in a micropore between two graphitic sheets via a facile method to control the concentration of metal ***‐hosted Cu–N_(4)C_(8) catalysts outperformed the previously reported M–N–C catalysts for CO_(2)‐to‐CO conversion,achieving a maximum CO Faradaic efficiency(FECO)of 96%,a CO current density of–8.97 mA cm^(–2) at–0.8 v versus reversible hydrogen electrode(RHE),and over FECO of 90%from–0.6 to–1.0 v versus *** studies revealed that the micropore of the graphitic layer in edge‐hosted Cu–N_(4)C_(8) sites causes the d‐orbital energy level of the Cu atom to shift upward,which in return decreases the occupancy of antibonding states in the*COOH *** research suggests new insights into tailoring the locally coordinated structure of the electrocatalyst at the atomic scale to achieve highly selective electrocatalytic reactions.

关键词： atomic local structure density functional theory electrochemical CO_(2)reduction metal nitrogen‐doped carbon single‐atom catalyst

Temporal-spatial Generation of Astrocytes in the Developing Diencephalon

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Neuroscience Bulletin 2024年第1期40卷 1-16页

作者： Wentong Hong Pifang Gong Xinjie Pan Zhonggan Ren Yitong Liu Guibo Qi Jun-Liszt Li Wenzhi Sun woo-Ping Ge Chun-Li Zhang Shumin Duan Song Qin Department of Anatomy Histology and EmbryologySchool of Basic Medical SciencesFudan UniversityShanghai 200032China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Chinese Institute for Brain Research Beijing 102206China School of Basic Medical Sciences Capital Medical UniversityBeijing 100069China Department of Molecular Biology University of Texas Southwestern Medical CenterDallasTexas 75390-9148USA Department of Neurobiology Key Laboratory of Medical Neurobiology of Ministry of Health of ChinaZhejiang University School of MedicineHangzhou 310058China State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Fudan UniversityShanghai 200032China

tAstrocytes are the largest glial population in the mammalian ***,we have a minimal understanding of astrocyte development,especially fate specification in different regions of the *** lineage tracing of the progenitors of the third ventricle(3v)wall via in-utero electroporation in the embryonic mouse brain,we show the fate specification and migration pattern of astrocytes derived from radial glia along the 3v ***,radial glia located in different regions along the 3v wall of the diencephalon produce distinct cell types:radial glia in the upper region produce astrocytes and those in the lower region produce neurons in the *** genetic fate mapping analysis,we reveal that the first population of astrocytes appears along the zona incerta in the *** occurs at an early time point in the dorsal region relative to that in the ventral region of the developing *** transcriptomic analysis of the region-specific 3v wall and lateral ventricle(Lv)wall,we identified cohorts of differentially-expressed genes in the dorsal 3v wall compared to the ventral 3v wall and Lv wall that may regulate astrogenesis in the dorsal ***,these results demonstrate that the generation of astrocytes shows a spatiotemporal pattern in the developing mouse diencephalon.

关键词： Radial glia Astrocyte specification Lineage tracing Diencephalon Third ventricle

Design of Cold-Junction Compensation and Disconnection Detection Circuits of various Thermocouples and Implementation of Multi-Channel Interfaces Using Them-A Secondary Publication

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Journal of Electronic Research and Application 2024年第1期8卷 93-105页

作者： Hyeong-woo Cha Department of Electronic Engineering Cheongju UniversityKorea

Cold-junction compensation(CJC)and disconnection detection circuit design of various thermocouples(TC)and multi-channel TC interface circuits were *** CJC and disconnection detection circuit consists of a CJC semiconductor device,an instrumentation amplifier(IA),two resistors,and a diode for disconnection *** on the basic circuit,a multi-channel interface circuit was also *** CJC was implemented using compensation semiconductor and IA,and disconnection detection was detected by using two resistors and a diode so that IA input voltage became-0.42 *** a result of the experiment using R-type TC,the error of the designed circuit was reduced from 0.14 mv to 3μv after CJC in the temperature range of 0°C to 1400°*** addition,it was confirmed that the output voltage of IA was saturated from 88 mv to-14.2 v when TC was disconnected from *** output voltage of the designed circuit was 0 v to 10 v in the temperature range of 0°C to 1400°*** results of the 4-channel interface experiment using R-type TC were almost identical to the CJC and disconnection detection results for each *** implemented multi-channel interface has a feature that can be applied equally to E,J,K,T,R,and S-type TCs by changing the terminals of CJC semiconductor devices and adjusting the IA gain.

关键词： R-type thermocouple(TC) Cold-junction compensation(CJC) TC disconnection detection Multi-channel interface circuit Sensor interface

Adaptive data fusion framework for modeling of non-uniform aerodynamic data

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Chinese Journal of Aeronautics 2023年第7期36卷 316-336页

作者： vinh PHAM Maxim TYAN Tuan Anh NGUYEN Chi-Ho LEE L.v.Thang NGUYEN Jae-woo LEE Department of Aerospace Information Engineering Konkuk UniversitySeoul 05029Republic of Korea Konkuk Aerospace Design-Airworthiness Institute Konkuk UniversitySeoul 05029Republic of Korea

Multi-fidelity Data Fusion(MDF)frameworks have emerged as a prominent approach to producing economical but accurate surrogate models for aerodynamic data modeling by integrating data with different fidelity ***,most existing MDF frameworks assume a uniform data structure between sampling data sources;thus,producing an accurate solution at the required level,for cases of non-uniform data structures is *** address this challenge,an Adaptive Multi-fidelity Data Fusion(AMDF)framework is proposed to produce a composite surrogate model which can efficiently model multi-fidelity data featuring non-uniform ***,the design space of the input data with non-uniform data structures is decomposed into subdomains containing simplified ***,different MDF frameworks and a rule-based selection process are adopted to construct multiple local models for the subdomain *** the other hand,the Enhanced Local Fidelity Modeling(ELFM)method is proposed to combine the generated local models into a unique and continuous global ***,the resulting model inherits the features of local models and approximates a complete database for the whole design *** validation of the proposed framework is performed to demonstrate its approximation capabilities in(A)four multi-dimensional analytical problems and(B)a practical engineering case study of constructing an F16C fighter aircraft’s aerodynamic *** comparisons of the generated models using the proposed AMDF framework and conventional MDF approaches using a single global modeling algorithm are performed to reveal the adaptability of the proposed approach for fusing multi-fidelity data featuring non-uniform ***,the results indicated that the proposed framework outperforms the state-of-the-art MDF approach in the cases of non-uniform data.

关键词： Aerodynamic modeling Data fusion Diverse data structure Multi-fidelity data Multi-fidelity surrogate modeling

Sub-2 nm mixed metal oxide for electrochemical reduction of carbon dioxide to carbon monoxide

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能源化学:英文版 2023年第9期84卷 303-310页

作者： Devina Thasia Wijaya Andi Haryanto Hyun woo Lim Kyoungsuk Jin Chan woo Lee Department of Chemistry Kookmin UniversitySeoul 02707Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Chemistry Korea UniversitySeoul 02841Republic of Korea

Mixed metal oxide(MMO) represents a critical class of materials that can allow for obtaining a dynamic interface between its components:reduced metal and its metal oxide counterpart during an electrocatalytic ***,a synthetic method utilizing a MOF-derived micro/mesoporous carbon as a template to prepare sub-2 nm MMO catalysts for CO_(2) electro reduction is *** from the zeolite imidazolate framework(ZIF-8),the pyrolyzed derivatives were used to synthesize sub-2 nm Pd-Ni MMO with different *** Ni-rich(Pd_(20)-Ni_(80)/ZC) catalyst exhibits unexpectedly superior performance for CO production with an improved Faradaic efficiency(FE) of 95.3% at the current density of 200 mA cm^(-2) at-0.56 v *** hydrogen electrode(RHE) compared to other Pd-Ni compositions.X-ray photoelectron spectroscopy(XPS) analysis confirms the presence of Ni^(2+) and Pd^(2+) in all compositions,demonstrating the presence of *** functional theory(DFT) calculation reveals that the lower CO binding energy on the surface of the Pd_(20)-Ni_(80) cluster eases CO desorption,thus increasing its *** work provides a general synthetic strategy for MMO electrocatalysts and can pave a new way for screening multimetallic catalysts with a dynamic electrochemical interface.

关键词： Carbon dioxide reduction Mixed metal oxide Nanoalloy Carbon monoxide Metal-organic framework

用于自供电运动检测的单电极模式摩擦纳米发电机

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微纳电子技术 2024年第9期61卷 91-99页

作者：王光伟姜富豪刁彬烜李鸿江 Joo Sang-woo 丛晨浩李欣琳青岛大学机电工程学院山东青岛266071 建国大学化学工程学院韩国首尔05029 青柔(青岛)智能科技有限公司山东青岛266071 岭南大学机械工程学院韩国庆山38541

智能仿生技术的迅速发展为医疗保健领域以及人机交互领域注入了新的活力。仿真人体皮肤功能,特别是触觉反应功能,是电子皮肤发展的一个关键方面。然而,现有的压阻式、压电式和电容式传统触觉传感器在实际应用中需要外部输入和电源系统... 详细信息

智能仿生技术的迅速发展为医疗保健领域以及人机交互领域注入了新的活力。仿真人体皮肤功能,特别是触觉反应功能,是电子皮肤发展的一个关键方面。然而,现有的压阻式、压电式和电容式传统触觉传感器在实际应用中需要外部输入和电源系统来进行信息控制和能量供应。介绍了一种新颖的方法,采用全点胶印刷方法制造单电极摩擦纳米发电机(TENG)阵列,同时服务于生物运动识别和能量收集的双重目的。该结构利用Ag/聚二甲基硅氧烷(PDMS)/碳纳米管(CNT)复合电极油墨,将PDMS作为弹性包裹载体,通过银浆的片状结构和CNT的管状结构实现了桥接导电网络结构,确保了高导电性以及良好的柔韧性和印刷特性。所制得的TENG峰值开路电压为142 v,短路电流为64μA,负载电阻为10 MΩ,最大输出功率为9.31 mW。

关键词：摩擦纳米发电机(TENG) 点胶打印自供电系统生物运动识别能量收集传感器

Emerging wearable flexible sensors for sweat analysis

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Bio-Design and Manufacturing 2022年第1期5卷 64-84页

作者： Wenzheng Heng Geng Yang woo SooKim Kaichen Xu State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Andrew and Peggy Cherng Department of Medical Engineering California Institute of TechnologyPasadenaCA 91125USA School of Mechatronic Systems Engineering Simon Fraser UniversitySurreyBC V3T 0A3Canada

Sweat,as a biofluid with the potential for noninvasive collection,provides profound insights into human health conditions,because it contains various chemicals and information to be utilized for the monitoring of well-being,stress levels,exercise,and ***,wearable sweat sensors have been developed as a promising substitute to conventional laboratory sweat detection *** sensors are promising to realize low-cost,real-time,in situ sweat measurements,and provide great opportunities for health status evaluation analysis based on personalized big *** review first presents an overview of wearable sweat sensors from the perspective of basic components,including materials and structures for specific sensing applications and *** strategies and specific methods of the fabrication of wearable power management are also ***,current challenges and future directions of wearable sweat sensors are discussed.

关键词： Flexibleelectronics Wearablesensors Sweat sensors Electrochemical analysis Noninvasivehealth monitoring Powersupply

Learning-based super-resolution interpolation for sub-Nyquist sampled laser speckles

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Photonics Research 2023年第4期11卷 631-642页

作者： HUANHAO LI ZHIPENG YU QI ZHAO YUNQI LUO SHENGFU CHENG TIANTING ZHONG CHI MAN woo HONGLIN LIU LIHONG v.WANG YUANJIN ZHENG PUXIANG LAI Department of Biomedical Engineering Hong Kong Polytechnic UniversityHong KongChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518063China School of Electrical and Electronics Engineering Nanyang Technological UniversitySingapore 639798Singapore Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Caltech Optical Imaging Laboratory Andrew and Peggy Cherng Department of Medical EngineeringCalifornia Institute of TechnologyPasadenaCalifornia 91125USA Photonics Research Institute Hong Kong Polytechnic UniversityHong KongChina

Information retrieval from visually random optical speckle patterns is desired in many scenarios yet considered *** requires accurate understanding or mapping of the multiple scattering process,or reliable capability to reverse or compensate for the scattering-induced phase *** whatever situation,effective resolving and digitization of speckle patterns are ***,on some occasions,to increase the acquisition speed and/or signal-to-noise ratio(SNR),speckles captured by cameras are inevitably sampled in the sub-Nyquist domain via pixel binning(one camera pixel contains multiple speckle grains)due to finite size or limited bandwidth of *** a down-sampling process is irreversible;it undermines the fine structures of speckle grains and hence the encoded information,preventing successful information *** retrace the lost information,super-resolution interpolation for such sub-Nyquist sampled speckles is *** this work,a deep neural network,namely SpkSRNet,is proposed to effectively up sample speckles that are sampled below 1/10 of the Nyquist criterion to well-resolved ones that not only resemble the comprehensive morphology of original speckles(decompose multiple speckle grains from one camera pixel)but also recover the lost complex information(human face in this study)with high fidelity under normal-and low-light conditions,which is impossible with classic interpolation *** successful speckle super-resolution interpolation demonstrations are essentially enabled by the strong implicit correlation among speckle grains,which is non-quantifiable but could be discovered by the well-trained *** further engineering,the proposed learning platform may benefit many scenarios that are physically inaccessible,enabling fast acquisition of speckles with sufficient SNR and opening up new avenues for seeing big and seeing clearly simultaneously in complex scenarios.

关键词： speckle interpolation hence

糖尿病患者强化降压对心房颤动事件和P波指数的作用

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中华高血压杂志 2017年第4期25卷 398-398页

作者： Chen LY Bigger JT Hickey KT Chen H Lopez-Jimenez C Banerji MA Evans G Fleg JL Papademetriou v Thomas A woo v Seaquist ER Soliman EZ 陈云叶鹏

目前为止还没有成熟的治疗手段用于预防2型糖尿病（type 2diabetes,T2DM）患者的心房颤动。该文比较标准降压与强化降压降低T2DM患者心房颤动发生率或P波指数的差异（P波指数是提示左心房异常的心电图指标,是心房颤动的中间表型）。

关键词： 2型糖尿病心房颤动 P波患者降压数心电图指标 T2DM