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A NUMERICAL STUDY OF THE TRAIN-INDUCED UNSTEADY AIRFLOW IN A SUBWAY TUNNEL WITH NATURAL VENTILATION DUCTS USING THE DYNAMIC LAYERING METHOD

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Journal of Hydrodynamics 2010年第2期22卷 164-172页

作者： huang Yuan-dong GAO Wei kim Chang-Nyung Department of Environmental Engineering University of Shanghai for Science and Technology Shanghai 200093China Department of Mechanical Engineering Kyung Hee University Yongin 449-701 Korea Industrial Liaison Research Institute Kyung Hee University Yongin 449-701 Korea

The objective of this study is to investigate numerically the characteristics of train-induced unsteady airflow in a subway tunnel with natural ventilation ducts.A three-dimensional numerical model using the dynamic layering method for the moving boundary of a train is first developed,and then it is validated against the model tunnel experimental *** the tunnel and subway train geometries in the numerical model exactly the same as those in the model tunnel experimental test,but with the ventilation ducts being connected to the tunnel ceiling and a barrier placed at the tunnel outlet,the three-dimensional train-induced unsteady tunnel flows are numerically *** computed distributions of the pressure and the air velocity in the tunnel as well as the time series of the mass flow rate at the ventilation ducts reveal the impact of the train motion on the exhaust and suction of the air through ventilation ducts and the effects of a barrier placed at the tunnel outlet on the duct ventilation *** the train approaches a ventilation duct,the air is pushed out of the tunnel through the *** the train passes the ventilation duct,the exhaust flow in the duct is changed rapidly to the suction *** the train passes the duct,the suction mass flow rate at the duct decreases with time since the air pressure at the opening of the duct is gradually recovered with time.A drastic change in the mass flow rate at a ventilation duct while a train passes the corresponding ventilation duct,causes a change in the exhaust mass flow rate at other ventilation ***,when a barrier is placed at the tunnel outlet,the air volume discharge rate at each ventilation duct is greatly increased,i.e.,the barrier placed at the tunnel outlet can improve remarkably the ventilation performance through each duct.

关键词： train-induced flow subway tunnel natural ventilation duct ventilation performance dynamic layering method

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A New Era in EdTech:Emerging Challenges and Opportunities

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ECNU Review of Education 2024年第2期7卷 252-257页

作者： Deoksoon kim Katrina Borowiec Stanton Wortham Lynch School of Education and Human Development Chestnut HillMassachusetts 02467-3800USA

The COVID-19 pandemic dramatically expanded the increasingly important role of educational technology(“EdTech”)in K-16 *** is“the introduction of information and technology tools in teaching and learning”(Ganimian et al.,2020,p.5).Examples of EdTech include audio-visual aids,computer-assisted learning,mobile devices,smart technologies,and virtual reality(huang et al.,2019).One sign of the growing importance of technology in schools is the rapid increase in EdTech investments,which tripled between 2019(pre-COVID)and 2021(during COVID;HolonIQ,2022).Nonetheless,inequality in access to technology remains a barrier for students in underserved schools(Chapman et al.,2010;Dorn et al.,2020).

关键词： smart teaching expanded

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Polythiophene solar cells processed from non-halogenated solvent with 15.68%efficiency

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Science China Chemistry 2023年第8期66卷 2347-2353页

作者： Xiaoxin Tan Youle Li Xiyue Yuan Seoyoung kim Yue Zhang Changduk Yang Fei huang Yong Cao Chunhui Duan Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou510640China School of Energy and Chemical Engineering Perovtronics Research CenterLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea

Polythiophenes(PTs)are prospective polymer donors for large-scale manufacturing and industrialization owing to their simple structures and low synthetic ***,the fabrication of PT solar cells depends on highly toxic chlorinated solvents,and less research has been done on the use of more environmentally friendly non-halogenated ***,highly efficient PT solar cells based on top-performance polythiophene,P5TCN-F25,processed from a non-halogenated solvent are reported by delicate aggregation control.A power conversion efficiency of up to 15.68%was achieved by depositing the active layer from a hot o-xylene solution,which is the record efficiency of non-halogenated processed PT solar cells up to *** appropriate solution temperature is beneficial to the formation of ordered polymer stacking and desirable phase separation size,which thereby contributes to enhanced charge transfer efficiency,more balanced hole/electron mobility,and reduced trap-assisted *** results provide valuable implications for improving the efficiency of PT solar cells via environmentallyfriendly processing.

关键词： polythiophenes organic solar cells high-efficiency non-halogenated solvent aggregation control

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Recent progress in silk fibroin-based flexible electronics

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Microsystems & Nanoengineering 2021年第3期7卷 1-25页

作者： Dan-Liang Wen De-Heng Sun Peng huang Wen huang Meng Su Ya Wang Meng-Di Han Beomjoon kim Juergen Brugger Hai-Xia Zhang Xiao-Sheng Zhang School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China CIRMM Institute of Industrial ScienceThe University of TokyoTokyo 153-8505Japan Microsystems Laboratory Ecole Polytechnique Federale de Lausanne(EPFL)1015 LausanneSwitzerland Institute of Microelectronics Peking University100087 BeijingChina

With the rapid development of the Internet of Things(loT)and the emergence of 5G,traditional silicon-based electronics no Ion ger fully meet market dema nds such as nonplanar application scenarios due to mechanical *** provides unprecedented opportunities for flexible electronics that bypass the physical rigidity through the introduction of flexible *** recent decades,biological materials with outstanding biocompatibility and biodegradability,which are considered some of the most promising candidates for next-generation flexible electronics,have received increasing attention,e.g.,silk fibroin,cellulose,pectin,chitosan,and *** them,silk fibroin presents greater superiorities in biocompatibility and biodegradability,and moreover,it also possesses a variety of attractive properties,such as adjustable water solubility,remarkable optical transmittance,high mechanical robustness,light weight,and ease of processing,which are partially or even completely lacking in other biological ***,silk fibroin has been widely used as fundamental components for the construction of biocompatible flexible electronics,particularly for wearable and implantable ***,in recent years,more attention has been paid to the investigation of the functional characteristics of silk fibroin;such as the dielectric properties,piezoelectric properties,strong ability to lose electrons,and sensitivity to environmental ***,this paper not only reviews the preparation technologies for various forms of silk fibroin and the recent progress in the use of silk fibroin as a fundamental material but also focuses on the recent advaneed works in which silk fibroin serves as functional *** on ally,the challenges and future development of silk fibroin-based flexible electronics are summarized.

关键词： fibroin silk attractive

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A Distributed Covert Channel of the Packet Ordering Enhancement Model Based on Data Compression

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Computers, Materials & Continua 2020年第9期64卷 2013-2030页

作者： Lejun Zhang Xiaoyan Hu Zhijie Zhang Weizheng Wang Tianwen huang Donghai Guan Chunhui Zhao Seokhoon kim College of Information Engineering Yangzhou UniversityYangzhou225127China Division of Computer Science University of AizuAizu-Wakamatsu9658580Japan College of Computer Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing211106China College of Information and Communication Engineering Harbin Engineering UniversityHarbin150001China Department of Computer Software Engineering Soonchunhyang UniversityAsanKorea

Covert channel of the packet ordering is a hot research *** technology is not enough to protect the security of both sides of *** channel needs to hide the transmission data and protect content of *** traditional methods are usually to use proxy technology such as tor anonymous tracking technology to achieve hiding from the ***,because the establishment of proxy communication needs to consume traffic,the communication capacity will be reduced,and in recent years,the tor technology often has vulnerabilities that led to the leakage of secret *** this paper,the covert channel model of the packet ordering is applied into the distributed system,and a distributed covert channel of the packet ordering enhancement model based on data compression(DCCPOEDC)is *** data compression algorithms are used to reduce the amount of data and transmission *** distributed system and data compression algorithms can weaken the hidden statistical probability of ***,they can enhance the unknowability of the data and weaken the time distribution characteristics of the data *** paper selected a compression algorithm suitable for DCCPOEDC and analyzed DCCPOEDC from anonymity,transmission efficiency,and transmission *** to the analysis results,it can be seen that DCCPOEDC optimizes the covert channel of the packet ordering,which saves the transmission time and improves the concealment compared with the original covert channel.

关键词： Covert channels information hiding data compression distributed system

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MECHANICS ANALYSIS OF TWO-DIMENSIONALLY PRESTRAINED ELASTOMERIC THIN FILM FOR STRETCHABLE ELECTRONICS

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Acta Mechanica Solida Sinica 2010年第6期23卷 592-599页

作者： Ming Li JianUang Xiao Jian Wu Rak-Hwan kim Zhan Kang Yonggang huang John A. Rogers State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China Departments of Civil and Environmental Engineering and Mechanical Engineering Northwestern University Evanston IL 60208 USA Department of Materials Science and Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana IL 61801 USA

Various methods have been developed to fabricate highly stretchable electronics. Recent studies show that over 100% two dimensional stretchability can be achieved by mesh structure of brittle functioning devices interconnected with serpentine bridges. kim et al show that pressing down an inflated elastomeric thin film during transfer printing introduces two di- mensional prestrain, and therefore further improves the system stretchability. This paper gives a theoretical study of this process, through both analytical and numerical approaches. Simple analytical solutions are obtained for meridional and circumferential strains in the thin film, as well as the maximum strain in device islands, which all agree reasonably well with finite element analysis.

关键词： stretchable electronics shell soft materials

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Influence of hierarchical ZSM-5 catalysts with various acidity on the dehydration of glycerol to acrolein

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Magnetic Resonance Letters 2021年第1期1卷 71-80页

作者： Shufang Zhao Songlin He Kyung Du kim Lizhuo Wang Ryong Ryoo Zichun Wang Jun huang Laboratory for Catalysis Engineering School of Chemical and Biomolecular EngineeringSydney Nano InstituteThe University of SydneyNSW2006Australia Center for Nanomaterials and Chemical Reactions Institute for Basic Science(IBS)Daejeon305-701South Korea Department of Chemistry Korea Advanced Institute of Science and TechnologyDaejeon34141South Korea Department of Engineering Macquarie UniversitySydneyNew South Wales2109Australia

The main challenge in the dehydration of glycerol to acrolein lies in overcoming catalystdeactivation and improving the selectivity to acrolein. The relationship between theacidity in the mesoporous channels and catalytic performance of glycerol dehydration israrely reported. In this work, to investigate the influence of acidity in the mesoporouschannels of hierarchical ZSM-5 catalysts on the dehydration of glycerol to acrolein, a seriesof hierarchical ZSM-5 zeolites with comparable mesoporous volume and mesoporous sizebut different acid properties in mesopores have been successfully prepared via alkalinetreatment. The sample with the abundant mesoporosity and highest acidity display thebest performance.

关键词： Zeolites Hierarchical pores Acidity Glycerol dehydration NMR

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Engineering of hollow polymeric nanosphere-supported imidazolium-based ionic liquids with enhanced antimicrobial activities

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Nano Research 2022年第6期15卷 5556-5568页

作者： Yu Zhang Shuwei Li Yixin Xu Xinyun Shi Mingxin Zhang Yingning huang Ying Liang Yaqiong Chen Wanli Ji Jung Rae kim Wenliang Song Deng-Guang Yu Il kim School of Pharmacy Shanghai University of Medicine&Health SciencesShanghai 201318China School of Materials Science&Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Polymer Science and Engineering Pusan National UniversityBusan 46241Republic of Korea School of Chemical and Biomolecular Engineering Pusan National UniversityBusan 46241Republic of Korea

The design of stable,efficient and processable bactericidal materials represents a significant challenge for combating multidrugresistant bacteria in a variety of engineering ***,we report a facile strategy for the preparation of hollow polymeric nanosphere(HPN)-supported imidazolium-based ionic liquids(denoted as HPN-ILs)with superior antimicrobial *** were tailored by moderate Friedel−Crafts polymerization followed by the sequential covalent bonding of imidazole and *** resultant HPN-ILs have uniform hollow spherical morphology,an adequate surface area,and excellent physicochemical ***,they are highly active against both Gram-positive and Gram-negative bacteria and exhibit typical time/dosage-dependent antibacterial *** rational combination of porous HPNs and antibacterial ILs to generate an all-in-one entity may open new avenues for the design and fabrication of efficient bacteriostatic ***,HPN-ILs have good biocompatibility and can also be loaded onto diverse matrices,and thus could extend their practical bactericidal application in the potential biomedical-active field.

关键词： antibacterial materials bioactive materials hollow nanospheres ionic liquids porous polymers

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马华文学的困境与黄锦树《雨》的隐喻书写

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韩山师范学院学报 2024年第4期45卷 80-86页

作者：黄雨耕马来亚大学艺术与社会科学学院吉隆坡50603

马来西亚华语文学作为华语文学的一支旁系,常年生存在主流华语文学体系之外,处于一种尴尬的失语状态。随着马来西亚民族国家意识的发展,华人在政治、经济、文化上受到打压,马华文学如何能够存续,该以怎样的方式存续,成为了一个无法绕开... 详细信息

马来西亚华语文学作为华语文学的一支旁系,常年生存在主流华语文学体系之外,处于一种尴尬的失语状态。随着马来西亚民族国家意识的发展,华人在政治、经济、文化上受到打压,马华文学如何能够存续,该以怎样的方式存续,成为了一个无法绕开的巨大困境。其中,黄锦树作为马华旅台作家中的代表,正试图借助小说探讨华人及其文学相关的议题。《雨》是黄锦树近年新作,其善于利用后设、游戏和拼贴等后现代小说技巧,轮回上演的文本结构充满中国性的文字游戏,对马华文学的困境做出自己的书写。黄锦树通过《雨》中的十八篇内容各异短篇小说,为读者描绘出一副奇异的南洋景观图,文本中胶林与大雨的本土性环境描写,蕴含着对故乡的回忆;生殖与繁衍的主题,折射出马华文学的生存焦虑;失踪与死亡的描述,体现马华文学的“失语”。可以看出,黄锦树通过现代的笔法,借外部结构和内容上的象征与寓言,隐喻出马华文学的困境。

关键词：马华文学困境黄锦树《雨》隐喻文体结构文本内涵

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Energy-efficient digital and wireless IC design for wireless smart sensing

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Journal of Semiconductors 2017年第10期38卷 30-38页

作者： Jun Zhou Xiongchuan huang Chao Wang Tony Tae-Hyoung kim Yong Lian University of Electronic Science and Technology of China Broadcom Singapore University of Technology and Design Nanyang Technological University Shanghai Jiao Tong University

Wireless smart sensing is now widely used in various applications such as health monitoring and structural *** conventional wireless sensor nodes,significant power is consumed in wirelessly transmitting the raw *** sensing adds local intelligence to the sensor node and reduces the amount of wireless data transmission via on-node digital signal *** the total power consumption is reduced compared to conventional wireless sensing,the power consumption of the digital processing becomes as dominant as wireless data *** paper reviews the state-of-the-art energy-efficient digital and wireless IC design techniques for reducing the power consumption of the wireless smart sensor node to prolong battery life and enable self-powered applications.

关键词： energy-efficient digital IC wireless IC wireless smart sensing

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