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Enhanced thermoelectric and mechanical properties of Bi_(0.5)Sb_(1.5)Te_(3) alloy with dispersed yttrium oxide ceramic nanoparticles

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Rare Metals 2024年第4期43卷 1758-1768页

作者： Cun-Cheng Li Ming-Wei Zhang Ji-Wu Xin Lei Wei Wen-Yu Zhao School of Materials Science and Engineering Shandong University of TechnologyZibo255000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Reducing thermal conductivity while avoiding adverse interfacial reactions during sintering is crucial for improving the thermoelectric performance of Bi_(2)Te_(3)based *** ceramic nanoparticles are good candidates for achieving this *** this study,we designed and prepared a series of p-type Bi_(0.5)Sb_(1.5)Te_(3)nanocomposites decorated with Y_(2)O_(3)ceramic nanoparticles via ball-milling dispersion and spark-plasma *** to the chemical stability of the ceramics,no traces of atomic doping or interfacial reactions were *** measurements revealed that the Y_(2)O_(3)nanoparticles distributed along the grain boundaries acted as energy-dependent carrier-filtering centers to improve the scattering parameter and Seebeck coefficient,contributing to the elevated power factor even with a decreased electrical ***,the incorporated Y_(2)O_(3)nanoparticles and various defect structures they induced effectively strengthened the phonon scattering and suppressed the lattice thermal ***,a peak figure of merit(ZT)of 1.23 at 313 K was achieved for 0.4%Y_(2)O_(3)/Bi_(0.5)Sb_(1.5)Te_(3),which is 13%higher than that of the *** addition,the Vickers hardness of the composite material was 35%higher than that of the *** study demonstrates the effectiveness of ceramic nanoparticles in synergistic ally improving the thermoelectric and mechanical properties,which may be further extended to other thermoelectric systems.

关键词： Bi_(0.5)Sb_(1.5)Te_3 alloy Y_(2)O_(3) ceramic nanoparticles Microstructures Thermoelectric performance Mechanical properties

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Chiral boryl radical catalyzed asymmetric radical cycloisomerization

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Science China Chemistry 2024年第7期67卷 2121-2123页

作者： Jiamiao Jin Shi-Chao Ren Yonggui Robin Chi National Key Laboratory of Green Pesticide Key Laboratory of Green Pesticide and Agricultural BioengineeringMinistry of EducationGuizhou UniversityGuiyang 550025China School of Chemistry Chemical Engineeringand BiotechnologyNanyang Technological UniversitySingapore 637371Singapore

Asymmetric catalytic organic synthesis is of profound importance in modern research and industries,providing optically enriched molecules with diverse structures and functions[1].Enzymes,transition metal complexes,and simple organic molecules have all been found as powerful catalysts that enable the bond breaking and forming events with excellent control over stereo-selectivity *** the realm of designed small molecule organic catalysts.

关键词： radical catalyzed asymmetric

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Zero-Dynamics Attacks for Multi-Agent Systems Without Velocity Measurements

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Journal of Systems Science & Complexity 2024年第5期37卷 1809-1831页

作者： GAO Jinming WANG Yijing ZUO Zhiqiang ZHANG Wentao Tianjin Key Laboratory of Intelligent Unmanned Swarm Technology and System School of Electrical and Information EngineeringTianjin UniversityTianjin 300072China Continental-NTU Corporate Lab School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore 639798Singapore

This paper studies the periodic zero-dynamics attacks(ZDAs)in multi-agent systems without velocity measurements under directed ***,two types of attack modes are addressed,i.e.,infinite number and finite number of zero-dynamics *** the former case,the authors show that the consensus of the considered system cannot be *** the latter case,the dynamic evolution of the agents is investigated and it is found that only attacking the rooted agents can destroy the ***,a sufficient condition which quantifies whether or not the consensus value is destroyed is given,revealing the relationship among parameters of system model,filter and attack ***,simulations are carried out to verify the effectiveness of the theoretical findings.

关键词： Consensus directed graph multi-agent systems zero-dynamics attacks

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An overview of Web3 technology:Infrastructure,applications,and popularity

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Blockchain(Research and Applications) 2024年第1期5卷 97-106页

作者： Renke Huang Jiachi Chen Yanlin Wang Tingting Bi Liming Nie Zibin Zheng School of Software Engineering Sun Yat-Sen UniversityGuangzhou 510275China Data61 ACT 2601Australia Zhejiang Sci-Tech university Hangzhou310018China nanyang technological university 639798Singapore

Web3,the next generation of the Internet,represents a decentralized and democratized *** it has garnered significant public interest and found numerous real-world applications,there is a limited understanding of people’s perceptions and experiences with *** this study,we conducted an empirical study to investigate the categories of Web3 applications and their popularity,as well as the potential challenges and opportunities within this emerging *** research was carried out in two *** the first phase,we analyzed 200 popular Web3 projects associated with 10 leading Web3 venture capital *** the second phase,we collected and examined code-related data from GitHub and market-related data from blockchain browsers(e.g.,Etherscan)for these *** analysis revealed that the Web3 ecosystem can be categorized into two groups,i.e.,Web3 infrastructure and Web3 applications,with each consisting of several subcategories or *** also gained insights into the popularity of these Web3 projects at both the code and market levels and pointed out the challenges in the Web3 ecosystem at the system,developer,and user levels,as well as the opportunities it *** findings contribute to a better understanding of Web3 for researchers and developers,which in turn promotes further exploration and advancement in this innovative field.

关键词： Web3 Blockchain Empirical study Survey

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Multi-stimuli-responsive aggregation-induced emission copper iodide cluster

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Science China Chemistry 2024年第4期67卷 1193-1197页

作者： Bo Li Yuan-Yuan Liu Peng Luo Ye-Ru Liu Ying-Jun Chen Kai Li Shuang-Quan Zang College of Chemistry and Pharmacy Engineering Nanyang Normal UniversityNanyang 473061China Green Catalysis Center and College of Chemistry Zhengzhou UniversityZhengzhou 450001China

Stimuli-responsive luminescent materials have attracted significant attention in the development of smart photoactive materials for both fundamental research and technological *** this work,a new copper iodide cluster(1)with aggregationinduced emission(AIE)characteristic,was obtained combining Cu_(4)I_(4) core with rhodamine B derivative ligand.1 has reversible and distinct multi-stimuli-responsive luminescence for external temperature,volatile organic compound,and mechanical ***,1 exhibited unusual large blue shift(84 nm)after being ground,which originated from the change of intermolecular ***,1 exhibits high oxygen quenching efficiency for 82.2% at 1 *** studies showed that the multi-stimuli-responsive luminescence properties of 1 can be attributed to the regulation of cluster-centered luminescence process,metal-to-ligand charge transfer process,halide-to-metal charge transfer luminescence process and aggregationinduced barrier to oxygen *** work not only reports an AIE copper iodide cluster,but also provides a new strategy to develop multi-stimuli-responsive luminescence materials.

关键词： copper iodide cluster aggregation-induced emission multi-stimuli-response

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Cnoidal waves and their soliton limits in single mode fiber lasers

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Photonics Research 2024年第3期12卷 543-551页

作者： XIAO HU TUPEI CHEN SEONGWOO YOO DINGYUAN TANG Julong College Shenzhen Technology UniversityShenzhen 518118China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

Cnoidal waves are a type of nonlinear periodic wave solutions of the nonlinear dynamic *** are well known in fluid dynamics,but it is not the case in *** this paper we show both experimentally and numerically that cnoidal waves could be formed in a fiber laser either in the net normal or net anomalous cavity dispersion regime,especially because,as the pump power is increased,the formed cnoidal waves could eventually evolve into a train of bright(in the net anomalous cavity dispersion regime)or dark(in the net normal cavity dispersion regime)*** simulations of the laser operation based on the extended nonlinear Schrödinger equation(NLSE)have well reproduced the experimental *** result not only explains why solitons can still be formed in a fiber laser even without mode locking but also suggests a new effective way of automatic stable periodic pulse train generation in lasers with a nonlinear cavity.

关键词： fiber pump mode

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Enones from aldehydes and alkenes by carbene-catalyzed dehydrogenative couplings

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Chinese Chemical Letters 2024年第9期35卷 150-154页

作者： Kun Tang Fen Su Shijie Pan Fengfei Lu Zhongfu Luo Fengrui Che Xingxing Wu Yonggui Robin Chi National Key Laboratory of Green Pesticide Key Laboratory of Green Pesticide and Agricultural BioengineeringMinistry of EducationGuizhou UniversityHuaxi DistrictGuiyang 550025China School of chemistry Chemical Engineeringand BiotechnologyNanyang Technological UniversitySingapore 637371Singapore

Enones are widely explored in synthetic chemistry as fundamental building blocks for a wide range of reactions and exhibit intriguing biological activities that are pivotal for drug *** development of synthetic strategies for highly efficient preparation of enones thereby receives intense attention,in particular through the transition metal-catalyzed coupling ***,we describe a carbene-catalyzed cross dehydrogenative coupling(CDC)reaction that enables effective assembly of simple aldehydes and alkenes to afford a diverse set of enone ***,the in situ generated aryl radical is pivotal to“activate”the alkene by forming an allyl radical through intermolecular hydrogen atom transfer(HAT)pathway and thus forging the carbon-carbon bond formation with aldehyde as the acyl ***,our method represents the first example on the enone synthesis through coupling of“non-functionalized”aldehydes and alkenes as coupling partners,and offers a distinct organocatalytic pathway to the transition metal-catalyzed coupling transformations.

关键词： Enones Cross dehydrogenative coupling N-Heterocyclic carbene Aryl radical Hydrogen atom transfer

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Ballistic design and testing of a composite armour reinforced by CNTs suitable for armoured vehicles

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Defence Technology（防务技术） 2024年第2期32卷 173-195页

作者： Evangelos Ch.Tsirogiannis Evangelos Daskalakis Mohamed H.Hassan Abdalla M.Omar Paulo Bartolo EODH SA Research and Development DepartmentLakkoma Chalkidikis63080Greece School of Mechanical Aerospace and Civil EngineeringUniversity of ManchesterManchesterM139PLUK Singapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological University639798Singapore

This paper is investigating the use of composite armour reinforced by nanomaterials, for the protection of light armoured(LAV) and medium armoured military vehicles(MAV), and the interaction between the composite materials and high-performance ballistic projectiles. Four armour materials, consisted of front hybrid fibre reinforced polymer cover layer, ceramic strike-face, fibre reinforced polymer intermediate layer and the metal matrix composite reinforced backplate, were manufactured and assembled by adhesive technology. The proposed laminated protection system is suitable for armoured ground vehicles;however, it could be used as armour on ground, air and naval platforms. The design of the protection system, including material selection and thickness, was elaborated depending on the performance requirements of Level 4 + STANAG 4569 military standard(projectile 14.5 mm × 114 mm API B32) and especially on a design philosophy which is analysed with the specifications. The backplate of this new composite is a hybrid material of Metal Matrix Composite(MMC) reinforced with carbon nanotubes(CNTs), manufactured with the use of powder metallurgy technique. The composite backplate material was morphologically, mechanically and chemically analysed. Results show that all plates are presenting high mechanical properties and ballistic characteristics, compared to commonly used armour plates. Real military ballistic tests according to AEP-STANAG 4569 were carried out for the total composite armour systems. After the ballistic tests, AA2024-CNT3 showed the best protection results, compared with the other plates(AA2024-CNT1 and AA2024-CNT2), with the projectile being unable to fully penetrate the composite plate.

关键词： Passive armour protection Protective armour Ballistic performance Hybrid composites Vehicle protection

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π-Fused Diazocines with Controllable Photoswitching Properties as Molecular Tweezers

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CCS Chemistry 2024年第9期6卷 2175-2185页

作者： Wei Yuan Mengjiao Wu Cheng Qian Jingjing Guo Yinglong Wu Ting He Haipeng Wei Xiaokai Chen Dongdong Wang Jiawei Liu Yue Zhao Shihuai Wang Jie Yang Zhongzheng Zhang Yulan Chen Yanli Zhao School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological UniversitySingapore 637371 State Key Laboratory of Supramolecular Structure and Materials Jilin UniversityChangchun 130012 Department of Chemistry National University of SingaporeSingapore 117543

Diazocines,a type of photoswitch molecules,are distinguished by their unique conformation and photochromic *** engineering of diazocines,especially theπ-extended ones,remains challenging due to limited synthetic ***,we developed threeπ-fused diazocines(BAZO-1,BAZO-2,and BAZO-3)via Bischler–Napieralski *** isomerizations(Z⇆E)were switchable under visible light sources(427 and 630 nm).The size of theirπ-extension exerted a significant influence on the isomerization process,whereby the biggest fourfold ring-closure diazocine(BAZO-3)showed the fastest conversion rate(Z→E).Notably,the half-life(t1/2)of the E isomer of BAZO-3 was 14.6 times higher than that of the twofold ring-closure ***,BAZO-3 acted as a molecular tweezer based on double N-embedded pyrene units,allowing it to bind to pyrene through supramolecular *** work may pave the way for designing novel photoswitches with long half-lives and lightcontrolled properties.

关键词： diazocine π-fused structure photochromism photoisomerization molecular tweezer

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Electron push-pull effects induced performance promotion in covalent organic polymer thin films-based memristor for neuromorphic application

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Chinese Chemical Letters 2024年第5期35卷 227-231页

作者： Panke Zhou Hong Yu Mun Yin Chee Tao Zeng Tianli Jin Hongling Yu Shuo Wu Wen Siang Lew Xiong Chen State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

Covalent organic polymer(COP)thin film-based memristors have generated intensive research interest,but the studies are still in their ***,by controlling the content of hydroxyl groups in the aldehyde monomer,Py-COP thin films with different electronic push-pull effects were fabricated bearing distinct memory performances,where the films were prepared by the solid-liquid interface method on the ITO substrates and further fabricated as memory devices with ITO/Py-COPs/Ag *** Py-COP-1-based memory device only exhibited binary memory behavior with an ON/OFF ratio of 1:10^(1.87).In contrast,the device based on Py-COP-2 demonstrated ternary memory behavior with an ON/OFF ratio of 1:10^(0.6):10^(3.1) and a ternary yield of 55%.The ternary memory mechanism of the ITO/Py-COP-2/Ag memory device is most likely due to the combination of the trapping of charge carriers and conductive ***,the Py-COPs-based devices can successfully emulate the synaptic potentiation/depression behavior,clarifying the programmability of these devices in neuromorphic *** results suggest that the electronic properties of COPs can be precisely tuned at the molecular level,which provides a promising route for designing multi-level memory devices.

关键词： Covalent organic polymers Push-pull effects Multi-level memory Memristor

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