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Portable hydrogel-based tri-channel fluorescence sensor array for visual detection of multiple explosives

Nano Research 2024年第7期17卷 6483-6492页

作者： Wenxing Gao Wenfeng Liu Saijin Huang Lin Wang Yingying Jian Yutong Li Weiwei wu Li Shang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China School of Advanced Materials and Nanotechnology Xidian UniversityXi'an 710126China honors college Northwestern Polytechnical UniversityXi'an 710119China

The identification and detection of various types of explosives are essential for human health and environmental ***-based sensing approach offers significant advantages in detecting multi-analytes simultaneously,thereby holding great potential in identifying multiple ***,we report a tri-channel fluorescence array composed of three distinct fluorescence probes based on gold nanoclusters and nicotinamide adenine dinucleotide with well-separated emission *** the specific interactions of explosives with different fluorescent probes and the yielded response patterns,seven explosives can be successfully distinguished with 100%*** particular,the sensor array exhibits excellent performance in the quantitative analysis of individual explosive and the differentiation of multiple explosive *** facilitate the field detection towards practical application,the tri-channel fluorescence array was further integrated with polymer *** fabricated portable hydrogel-based array sensors can not only visually identify seven different explosives by their distinct fluorescence color change,but also enable quantitative detection based on linear discriminant analysis(LDA)together with a *** study illustrates the great potential of hydrogel-based fluorescence sensor array as robust sensors for explosives,which also holds significant promise for the development of portable explosive devices towards practical application.

关键词： sensor array gold nanoclusters explosives fluorescence hydrogels

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串列式倾斜拍动翼-固定翼构型的升推性能转化研究

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Acta Mechanica Sinica 2024年第5期40卷 50-60页

作者：李港吴江浩李家茗张艳来陈隆 School of Transportation Science and Engineering Beihang University Beijing China Shenyuan honors college Beihang University Beijing China School of Aeronautic Science and Engineering Beihang University Beijing China

昆虫和微型飞行器存在间隙狭窄的串列式拍动翼-固定翼构型.与独立的拍动翼相比,两翼之间的干扰作用可以增强推力,但推力增量能否通过倾斜拍动平面而转化为升力尚不清楚.本文采用浸润边界法和格子玻尔兹曼方法研究了这种串列双翼构型在... 详细信息

昆虫和微型飞行器存在间隙狭窄的串列式拍动翼-固定翼构型.与独立的拍动翼相比,两翼之间的干扰作用可以增强推力,但推力增量能否通过倾斜拍动平面而转化为升力尚不清楚.本文采用浸润边界法和格子玻尔兹曼方法研究了这种串列双翼构型在不同拍动平面倾角下的气动性能。结果表明,当拍动平面倾角为75°时,干扰作用产生的大部分推力增量转化为升力增量,证明了通过倾斜拍动平面实现升推转化的可行性。除了几何投影和有效迎角改变的贡献外,升力增量还来自于两翼位置最接近时的额外升力峰,其流动机制包括两部分:一方面,固定翼阻碍了拍动翼产生的射流并在间隙内产生了较强的水平回流,从而增强了拍动翼上翼面后缘附近的低压区;另一方面,固定翼前方的上洗气流增强了拍动翼下翼面的高压区.进一步分析表明,这种增升机制在多个拍动幅度下有效,因此可以认为该机制在三维构型中仍然存在。上述研究结果揭示了一种通过倾斜拍动平面来增强串列式拍动翼-固定翼构型升力的新机制,为以这种构型为基础的微型飞行器提供了新设计方案.

关键词：微型飞行器倾斜拍动平面拍动翼固定翼格子玻尔兹曼方法几何投影增升流动机制

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A General Framework for Intelligent IoT Data Acquisition and Sharing in an Untrusted Environment Based on Blockchain

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China Communications 2024年第3期21卷 137-148页

作者： Lu Yin Xue Yongtao Li Qingyuan wu Luocheng Li Taosen Yang Peipei Zhu Hongbo college of Internet of Things Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Lab of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications) Ministry of EducationNanjing 210003China Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China Research Institute of Internet of Things Nanjing University of Posts and TelecommunicationsNanjing 210003China Bell honors School Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Automation Nanjing University of Posts and TelecommunicationsNanjing 210023China

Traditional Io T systems suffer from high equipment management costs and difficulty in trustworthy data sharing caused by *** provides a feasible research direction to solve these problems. The main challenge at this stage is to integrate the blockchain from the resourceconstrained Io T devices and ensure the data of Io T system is credible. We provide a general framework for intelligent Io T data acquisition and sharing in an untrusted environment based on the blockchain, where gateways become Oracles. A distributed Oracle network based on Byzantine Fault Tolerant algorithm is used to provide trusted data for the blockchain to make intelligent Io T data trustworthy. An aggregation contract is deployed to collect data from various Oracle and share the credible data to all on-chain users. We also propose a gateway data aggregation scheme based on the REST API event publishing/subscribing mechanism which uses SQL to achieve flexible data aggregation. The experimental results show that the proposed scheme can alleviate the problem of limited performance of Io T equipment, make data reliable, and meet the diverse data needs on the chain.

关键词： blockchain data sharing Internet of Things Oracle

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A Review on Strengthening of Timber Beams Using Fiber Reinforced Polymers

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Journal of Renewable Materials 2022年第8期10卷 2073-2098页

作者： Bingyu Jian Ke Cheng Haitao Li Mahmud Ashraf Xiaoyan Zheng Assima Dauletbek Mahdi Hosseini Rodolfo Lorenzo Ileana Corbi Ottavia Corbi Kun Zhou college of Civil Engineering Nanjing Forestry UniversityNanjing210037China Joint International Research Laboratory for Bio-Composite Building Materials and Structures Nanjing Forestry UniversityNanjing210037China wu yuzhang honors college Sichuan UniversityChengdu610200China Deakin University GeelongVIC 3216Australia University college London LondonWC1E 6BTUK University of Naples Federico II Naples80133Italy Guangxi Lvjing Bamboo Industry Co. Ltd.Guilin541402China

Fiber reinforced polymer(FRP)has been used in the construction industry because of its advantages such as high strength,light weight,corrosion resistance,low density and high *** paper presents a review of bonding techniques adopted to strengthen timber beams using FRP to achieve larger *** methods of bonding between FRP and timber beams have been summarized with a focus on the influencing factors and their effects as well as relevant bond-slip models proposed for fundamental *** investigations to evaluate the flexural performance of timber beams strengthened by FRP bars,sheets and wraps have also been critically reviewed to identify key influencing *** research available on the shear performance of FRP reinforced timber beams have been analyzed to determine the influencing factors of the shear performance in timber-FRP *** paper finally presents an overall summary of the current-state-of-the-art and proposes some future research directions in the field.

关键词： Fiber reinforced polymer(FRP) timber beams retrofitting engineered timber flexural properties

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Research on the Influencing Factors of Rural Low-carbon Economic Development and Government Regulation

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Asian Agricultural Research 2011年第9期3卷 11-14,20页

作者： OUYANG Bo-wen1,WANG Shao-hui2 1.wu yuzhang honors college of Sichuan University,Chengdu 610065,China 2.Mathematical college,Sichuan University,Chengdu 610065,China wu yuzhang honors college Sichuan University Mathematical college Sichuan University

This paper analyses the main factors causing sluggish development of rural low-carbon economy in China as follows:the rural energy structure is irrational;the infrastructure and technology are relatively backward;system of laws,regulations and policy is not sound;fund-raising mechanism develops slowly;farmers' low-carbon awareness and ability are *** the basis of these unfavorable factors,from the perspective of government regulation,feasible strategies are put forward in line with the actual situation of rural low-carbon economic development in China.

关键词： Rural low-carbon economy Influencing factors Gover

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Fractional partial differential equation denoising models for texture image

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Science China(Information Sciences) 2014年第7期57卷 184-202页

作者： PU YiFei SIARRY Patrick ZHOU JiLiu LIU YiGuang ZHANG Ni HUANG Guo LIU YiZhi School of Computer Science and Technology Sichuan University Universit de Paris 12 (LiSSi E.A.3956) 61 av.du Gnral de Gaulle94010 CRETEIL CedexFrance Library of Sichuan University Sichuan University Computer Science college Leshan Normal University wu yuzhang honors college of Sichuan University

In this paper,a set of fractional partial differential equations based on fractional total variation and fractional steepest descent approach are proposed to address the problem of traditional drawbacks of PM and ROF multi-scale denoising for texture *** extending Green,Gauss,Stokes and Euler-Lagrange formulas to fractional field,we can find that the integer formulas are just their special case of fractional *** order to improve the denoising capability,we proposed 4 fractional partial differential equation based multiscale denoising models,and then discussed their stabilities and convergence *** deduction and experimental evaluation demonstrate the stability and astringency of fractional steepest descent approach,and fractional nonlinearly multi-scale denoising capability and best value of parameters are discussed *** experiments results prove that the ability for preserving high-frequency edge and complex texture information of the proposed denoising models are obviously superior to traditional integral based algorithms,especially for texture detail rich images.

关键词： fractional Green formula fractional Euler-Lagrange equation fractional steepest descent approach fractional extreme points fractional total variation fractional differential mask.

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Facile Preparation of NiO@graphene Nanocomposite with Superior Performances as Anode for Li-ion Batteries

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Acta Metallurgica Sinica(English Letters) 2022年第2期35卷 212-222页

作者： Junke Ou Shugen wu Lin Yang Hao Wang Institute for Advanced Study Chengdu UniversityChengdu 610106China Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science and EngineeringZigong 643000China Zhanglan honors college Chengdu UniversityChengdu 610106China School of Medicine Chengdu UniversityChengdu 610106China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Transition metal oxides gain considerable research attentions as potential anode materials for lithium ion batteries,but their applications are hindered due to their poor electronic conductivity,weak cycle stability and drastic volume ***,a NiO@graphene composite with a unique 3D conductive network structure is prepared through a simple *** applied as anode material for Li-ion batteries,at 50 mA g^(−1),the NiO@graphene displays a high reversible capacity of 1366 mAh g^(−1) and a stable cyclability of 205 mAh g^(−1) after 500 *** at a high rate of 10 A g^(−1),it displays a favorable reversible capacity of 711 mAh g^(−1).Remarkably,when it recovers back to 0.05 A g^(−1),a reversible capacity of 1741 mAh g^(−1) is ***,the NiO@graphene composite with 3D structure shows good application prospects as an alternative anode for advanced lithium ion batteries.

关键词： Lithium ion batteries 3D conductive network structure NiO@graphene composite Alternative

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Hydrothermal Preparation of Homogeneous Cobalt Oxide Nanomaterials as Stable Anodes for Superior Lithium Ion Batteries

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Acta Metallurgica Sinica(English Letters) 2021年第3期34卷 383-389页

作者： Junke Ou Shugen wu Hao Wang Institute for Advanced Study Chengdu UniversityChengdu 610106China Zhanglan honors college Chengdu UniversityChengdu 610106China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

In this study,uniform Co_(3)O_(4) nanoparticles are prepared via a simple and facile hydrothermal synthesis without calcination *** the Co_(3)O_(4)nanomaterials are investigated as anodes for lithium ion batteries,a good electrochemical property is ***,the reversible capacity of the as-synthesized Co_(3)O_(4) nanoparticle has a significant growth from383 mAh g^(-1)of the initial cycle to 471 mAh g^(-1)of the 300 th cycle at 2 A g^(-1).Moreover,when it recovers to 50 mA g^(-1)after different current densities,a superior reversible capacity of 695 mAh g^(-1)can be *** favorable electrochemical properties will make the as-obtained Co_(3)O_(4) have a good application prospect as anode material for lithium ion batteries.

关键词： Co3O4 Hydrothermal synthesis Anode Lithium ion batteries

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Trajectory optimization of SUAV communication relay based on GWO algorithm in the environments with sea breeze

Trajectory optimization of SUAV communication relay based on...

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第三十九届中国控制会议

作者： Yuebin Lun Honglun Wang Jianfa wu Yanxiang Wang School of Automation Science and Electrical Engineering Beihang University Science and Technology on Aircraft Control Laboratory Beihang University Shenyuan honors college Beihang University

The study is based on the combination of communication relay and energy absorption of solar-powered unmanned aerial vehicle（SUAV）,which is a multiple extremum *** SUAV kinematics model is changed from two dimensions to three dimensions with adding the interference of sea breeze to reduce or offset the impact of wind on mission optimization and improve the energy *** the performance of the on-line optimization of SUAVs,the particle swarm optimizer（PSO） algorithm is replaced by a faster grey wolf optimizer（GWO） *** order to accelerate the convergence speed of the algorithm and avoid falling into local optimality,a penalty function is added in this paper to judge whether there is a SUAV as the last branch of the communication *** results prove the necessity of the model with consideration of the wind and the effectiveness of the methods.

关键词： SUAV sea breeze communication relay energy absorption optimal trajectories distributed model predictive control(DMPC) GWO

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Cross-heterogeneous Domain Authentication Scheme Based on Blockchain

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Journal of Artificial Intelligence and Technology 2021年第2期1卷 92-100页

作者： Jing Liu Yixin Liu Yingxu Lai Rongchen Li Siyu wu Sami Mian college of Computer Science Faculty of Information TechnologyBeijing University of TechnologyBeijing 100124China Shaanxi Key Laboratory of Network and System Security Xi’an 710071China Science and Technology on Information Assurance Laboratory Beijing 100072China Engineering Research Center of Intelligent Perception and Autonomous Control Ministry of EducationBeijing 100124China Fan Gongxiu honors college Beijing University of TechnologyBeijing 100124China University of Pittsburgh PittsburghPA 15260USA

With the rising popularity of the Internet and the development of big data technology,an increasing number of organizations are opting to cooperate across domains to maximize their *** organizations use public key infrastructure to ensure security in accessing their data and ***,with the continuous development of identity-based encryption(IBE)technology,small-and medium-sized enterprises are increasingly using IBE to deploy internal authentication *** solve the problems that arise when crossing heterogeneous authentication domains and to guarantee the security of the certification process,we propose using blockchain technology to establish a reliable cross-domain authentication *** the distributed and tamper-resistant characteristics of the blockchain,we design a cross-domain authentication model based on blockchain to guarantee the security of the heterogeneous authentication process and present a cross-domain authentication protocol based on *** model does not change the internal trust structure of each authentication domain and is highly ***,on the premise of ensuring security,the process of verifying the signature of the root certificate in the traditional cross-domain authentication protocol is improved to verify the hash value of the root certificate,thereby improving the authentication *** developed prototype exhibits generality and simplicity compared to previous methods.

关键词： public key infrastructure identity-based encryption cross-domain authentication blockchain

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