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Water-soluble Cu30 nanoclusters as a click chemistry catalyst for living cell labeling via azide-alkyne cycloaddition

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Nano Research 2023年第1期16卷 1748-1754页

作者： Ge Yang Yali Xie Yaru Wang Ying Tang Leng Leng Chng Fuyi Jiang Fanglin Du Xianfeng Zhou Jackie Y.Ying Xun Yuan School of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Key lab of Biobased Polymer Materials of Shandong Provincial Education Department School of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042China NanoBio lab Institute of Materials Research and Engineering(IMRE)Agency for ScienceTechnology and Research(A*STAR)31 Biopolis WayThe NanosSingapore 138669Singapore School of Environment and Material Engineering Yantai UniversityYantai 264005China NanoBio lab A*STAR Infectious Diseases LabsA*STAR31 Biopolis WayThe NanosSingapore 138669Singapore

Cu(I)-catalyzed azide-alkyne cycloadditions(CuAAC)have gained increasing interest in the selective labeling of living cells and organisms with ***,their application is constrained either by the high cytotoxicity of Cu(I)ions or the low activity of CuAAC in the internal space of living *** paper reports the design of a novel Cu-based nanocatalyst,watersoluble thiolated Cu30 nanoclusters(NCs),for living cell labeling via *** Cu30 NCs offer good biocompatibility,excellent stability,and scalable synthesis(e.g.,gram scale),which would facilitate potential commercial *** combining the highly localized Cu(I)active species on the NC surface and good structural stability,the Cu30 NCs exhibit superior catalytic activities for a series of Huisgen cycloaddition reactions with good *** importantly,the biocompatibility of the Cu30 NCs enables them to be a good catalyst for CuAAC,whereby the challenging labeling of living cells can be achieved via CuAAC on the cell *** study sheds light on the facile synthesis of atomically precise Cu NCs,as well as the design of novel Cu NCs-based nanocatalysts for CuAAC in intracellular bioorthogonal applications.

关键词： Cu nanocluster click chemistry catalysis azide-alkyne cycloaddition living cell labeling

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Comments on “Sidewinding with Minimal Slip: Snake and Robot Ascent of Sandy Slopes”

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机器人 2015年第2期37卷 254-256页

作者： LIU Jinguo GAO Yang WANG Yuechao MA Shugen LUO Yifan State Key laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences star lab Surrey Space Centre University of Surrey Department of Robotics College of Science and Engineering Ritsumeikan University

Marvi et al(Science,2014,vol.346,p.224)concluded a sidewinder rattlesnake increases the body contact length with the sand when granular incline angle *** also claimed the same principle should work on robotic snake *** have evidence to prove that this conclusion is only partial in describing the snake body-sand *** should be three phases that fully represent the snake locomotion behaviors during ascent of sandy slopes,namely lifting,descending,and *** snake body-sand interaction during the descending and ceasing phases helps with the climbing while such interaction during the lifting phase in fact contributes resistance.

关键词：机器人设计工业机器人应用

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Resistance modulation in Ge2Sb2Te5

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Journal of Materials Science & Technology 2020年第15期47卷 171-177页

作者： Jitendra K.Behera Wei Jie Wang Xilin Zhou Shan Guan Wu Weikang Yang AShengyuan Robert ESimpson ACTA lab Singapore University of Technology and Design(SUTD)8 Somapah Road487372Singapore Jnstitute of Microelectronics A*STAR2 Fusionopolis Way138634Singapore Research lab for Quantum Materials Singapore University of Technology and Design(SUTD)8 Somapah Road487372Singapore

Chalcogenide based phase change random access memory(PCRAM) holds great promise for high speed and large data storage *** memory is scalable,requires a low switching energy,has a high endurance,has fast switching speed,and is ***,decreasing the switching time whilst increasing the cycle endurance is a key challenge for this technology to replace dynamic random access *** we demonstrate high speed and high endurance ultrafast transient switching in the SET state of a prototypical phase change memory *** switching is modeled by electron-phonon and lattice scattering on short timescales and charge carrier excitation on long *** volatile switching in phase change materials enables the design of hybrid memory modulators and ultrafast logic circuits.

关键词： Phase change memory Transient resistance Volatile Scattering Charge carrier excitation Large endurance

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Rethinking Global Context in Crowd Counting

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Machine Intelligence Research 2024年第4期21卷 640-651页

作者： Guolei Sun Yun Liu Thomas Probst Danda Pani Paudel Nikola Popovic Luc Van Gool Computer Vision lab ETH ZürichZürich 8092Switzerland Institute for Infocomm Research A*STARSingapore 138632Singapore Magic Leap Zürich 8050Switzerland

This paper investigates the role of global context for crowd ***,a pure transformer is used to extract features with global information from overlapping image *** by classification,we add a context token to the input sequence,to facilitate information exchange with tokens corresponding to image patches throughout transformer *** to the fact that transformers do not explicitly model the tried-and-true channel-wise interactions,we propose a token-attention module(TAM)to recalibrate encoded features through channel-wise attention informed by the context *** that,it is adopted to predict the total person count of the image through regression-token module(RTM).Extensive experiments on various datasets,including ShanghaiTech,UCFQNRF,JHU-CROWD++and NWPU,demonstrate that the proposed context extraction techniques can significantly improve the performanceover the baselines.

关键词： Crowd counting vision transformer global context attention density map.

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Vision Transformers with Hierarchical Attention

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Machine Intelligence Research 2024年第4期21卷 670-683页

作者： Yun Liu Yu-Huan Wu Guolei Sun Le Zhang Ajad Chhatkuli Luc Van Gool Institute for Infocomm Research(I2R) A*STARSingapore 138632Singapore Institute of High Performance Computing(IHPC) A*STARSingapore 138632Singapore Computer Vision lab ETH ZürichZürich 8092Switzerland School of Information and Communication Engineering University of Electronic Science and Technology of China(UESTC)Chengdu 611731China

This paper tackles the high computational/space complexity associated with multi-head self-attention(MHSA)in vanilla vision *** this end,we propose hierarchical MHSA(H-MHSA),a novel approach that computes self-attention in a hierarchical ***,we first divide the input image into patches as commonly done,and each patch is viewed as a ***,the proposed H-MHSA learns token relationships within local patches,serving as local relationship ***,the small patches are merged into larger ones,and H-MHSA models the global dependencies for the small number of the merged *** last,the local and global attentive features are aggregated to obtain features with powerful representation *** we only calculate attention for a limited number of tokens at each step,the computational load is reduced ***,H-MHSA can efficiently model global relationships among tokens without sacrificing fine-grained *** the H-MHSA module incorporated,we build a family of hierarchical-attention-based transformer networks,namely *** demonstrate the superiority of HAT-Net in scene understanding,we conduct extensive experiments on fundamental vision tasks,including image classification,semantic segmentation,object detection and instance ***,HAT-Net provides a new perspective for vision *** and pretrained models are available at https://***/yun-liu/HAT-Net.

关键词： Vision transformer hierarchical attention global attention local attention scene understanding.

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Genetic algorithm for pareto optimum-based route selection

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Journal of Systems Engineering and Electronics 2007年第2期18卷 360-368页

作者： Cui Xunxue Li Qin Tao Qing New star Research Inst. of Applied Technology Hefei 230031 P. R. China Jiangsu Key lab of Computer Information Processing Technology Soochow Univ. Suzhou 215006 P. R. China

A quality of service （QoS） or constraint-based routing selection needs to find a path subject to multiple constraints through a network. The problem of finding such a path is known as the multi-constrained path （MCP） problem, and has been proven to be NP-complete that cannot be exactly solved in a polynomial time. The NPC problem is converted into a multiobjective optimization problem with constraints to be solved with a genetic algorithm. Based on the Pareto optimum, a constrained routing computation method is proposed to generate a set of nondominated optimal routes with the genetic algorithm mechanism. The convergence and time complexity of the novel algorithm is analyzed. Experimental results show that multiobjective evolution is highly responsive and competent for the Pareto optimum-based route selection. When this method is applied to a MPLS and metropolitan-area network, it will be capable of optimizing the transmission performance.

关键词： Route selection Multiobjective optimization Pareto optimum Multi-constrained path Genetic algorithm.

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Silicon photonic platforms for mid-infrared applications [Invited]

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Photonics Research 2017年第5期5卷 417-430页

作者： TING HU BOWEI DONG XIANSHU LUO TSUNG-YANG LIOW JUNFENG SONG CHENGKUO LEE GUO-QIANG LO Institute of Microelectronics Agency for Science Technology and Research (A*STAR) Department of Electrical & Computer Engineering National University of Singapore4 Engineering Drive 3

Silicon photonic integrated circuits for telecommunication and data centers have been well studied in the past decade, and now most related efforts have been progressing toward commercialization. Scaling up the silicon-oninsulator(SOI)-based device dimensions in order to extend the operation wavelength to the short mid-infrared(MIR) range(2–4 μm) is attracting research interest, owing to the host of potential applications in lab-on-chip sensors, free space communications, and much more. Other material systems and technology platforms, including silicon-on-silicon nitride, germanium-on-silicon, germanium-on-SOI, germanium-on-silicon nitride, sapphireon-silicon, Si Ge alloy-on-silicon, and aluminum nitride-on-insulator are explored as well in order to realize low-loss waveguide devices for different MIR wavelengths. In this paper, we will comprehensively review silicon photonics for MIR applications, with regard to the state-of-the-art achievements from various device demonstrations in different material platforms by various groups. We will then introduce in detail of our institute's research and development efforts on the MIR photonic platforms as one case study. Meanwhile, we will discuss the integration schemes along with remaining challenges in devices(e.g., light source) and integration. A few application-oriented examples will be examined to illustrate the issues needing a critical solution toward the final production path(e.g., gas sensors). Finally, we will provide our assessment of the outlook of potential futureresearch topics and engineering challenges along with opportunities.

关键词： SOI Invited Silicon photonic platforms for mid-infrared applications MIR

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Intrinsic Fluorescence Spectra Characteristics of Vitamin B1, B2 and B6

Intrinsic Fluorescence Spectra Characteristics of Vitamin B1...

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国防光电子论坛第二届新型探测技术及其应用研讨会

作者： YANG Hui XIAO Xue ZHAO Xuesong HU Lan LV Caofang YIN Zhangkun New star Application Technology Institute Key lab. of Environmental Optics & Technology AIOFM CAS

This paper presents the intrinsic fluorescence characteristics of vitamin B1, B2 and B6 measured with 3D fluorescence Spectrophotometer. Three strong fluorescence areas of vitamin B2 locate at λex/λem=270/525 nm,370/525 nm and 450/525 nm, one fluorescence areas of vitamin B1 locates at λex/λem=370/460 nm, two fluorescence areas of vitamin B6 locates at λex/λem=250/370 nm and 325/370 nm were found. The influence of p H of solution to the fluorescence profile was also discussed. Using the PARAFAC algorithm, 10 vitamin B1, B2 and B6 mixed solutions were successfully decomposed, and the emission profiles, excitation profiles, central wavelengths and the concentration of the three components were retrieved precisely through about 5 iteration times.

关键词： Thiamine/Vitamin B1 Riboflavin/Vitamin B2 Pyridoxine/Vitamin B6 Fluorescence Spectra PARAFAC

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Autonomous Chemistry Enabling Environment-Adaptive Electrochemical Energy Storage Devices

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CCS Chemistry 2023年第1期5卷 11-29页

作者： Zhisheng Lv Wenlong Li Jiaqi Wei Fanny Ho Jie Cao Xiaodong Chen Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)138634 Singapore Innovative Centre for Flexible Devices(iFLEX) Max Planck—NTU Joint Lab for Artificial SensesSchool of Materials Science and EngineeringNanyang Technological University639798 Singapore

Next-generation electronics that are fused into the human body can play a key role in future intelligent communication,smart healthcare,and human enhancement *** a promising energy supply component for smart biointegrated electronics,environment-adaptive electrochemical energy storage(EES)devices with complementary adaptability and functions have garnered huge interest in the past *** to the advancements in autonomous chemistry,which regulate the constitutional dynamic networks in materials,EES devices have witnessed higher freedom of autonomous adaptability in terms of mechano-adaptable,biocompatibility,and stimuli-response properties for biointegrated and smart *** this mini-review,we summarize the recent progress in emerging environmentadaptive EES devices enabled by the constitutional dynamic network of mechanical adaptable materials,biocompatible materials,and stimuli-responsive supramolecular polymer ***,the challenges and perspectives of autonomous chemistry on the environment-adaptive EES devices are discussed.

关键词： autonomous chemistry biointegrated electronics environmental adaption electrochemical energy storage devices

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To move or stay?A cellular automata model to predict urban growth in coastal regions amidst rising sea levels

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International Journal of Digital Earth 2021年第9期14卷 1213-1235页

作者： Siqin Wang Yan Liu Yongjiu Feng Zhenkun Lei School of Earth and Environmental Sciences The University of QueenslandSt LuciaAustralia Spatio-Temporal Analytics Research laboratory(star lab) The University of QueenslandSt LuciaAustralia College of Surveying and Geo-Informatics Tongji UniversityShanghaiPeople’s Republic of China College of Marine Sciences Shanghai Ocean UniversityShanghaiPeople’s Republic of China

Low-lying coastal cities are widely acknowledged as the most densely populated places of urban settlement;they are also more vulnerable to risks resulting from intensive land use and land cover change,human activities,global climate change,and the rising sea *** study aims to predict how urban growth is affected by sea level rise(SLR)in the Australian *** develop an urban cellular automata model incorporating urban planning policies as potential drivers or constraints of urban growth under different SLR scenarios and adaption *** on data capturing the socioeconomic and environmental factors in South East Queensland,Australia,our model is positioned to address one core research question:how does SLR affect future urban growth and human resettlement?Results show that urban growth in coastal regions varies depending on the extent to which the sea level rises and is affected by a combination of factors relating to urban planning and human adaptation *** study demonstrates the complexity of urban growth in coastal regions and the nuanced outcomes under different adaptation strategies in the context of rising sea levels.

关键词： Climate change Cellular automata Sea level rise Urban growth Human settlement

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