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Freestanding nanosheets of 1T-2H hybrid MoS_(2) as electrodes for efficient sodium storage

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Journal of Materials Science & Technology 2021年第8期67卷 237-242页

作者： haiyang yu Zhenzhu Wang Jiangfeng Ni Liang Li School of Physical Science and Technology Center for Energy Conversion Materials&PhysicsJiangsu Key Laboratory of Thin FilmsSoochow UniversitySuzhou 215006China

Molybdenum disulfide(MoS_(2)) is a promising electrode material for sodium-ion batteries as it offers a large capacity through a distinct conversion ***,the electrochemical potential of MoS_(2) is often restrained by the poor conductivity as the dominant 2 H phase is a semiconductor while the metallic1 T phase is thermodynamically *** this work,we report a hybrid design and material preparation of freestanding nanosheets of MoS_(2) composed of both 1 T and 2 H phases based on mild hydrothermal *** introduction of the metallic 1 T-MoS_(2) phase into 2 H-MoS_(2) and their intimate hybridization enable a significant improvement in electronic conductivity,while the freestanding architecture avoids possible electrochemical *** used as electrodes for sodium storage,such a hybrid MoS_(2) affords a high capacity of~500 mA h g^(-1) at 0.5 A g^(-1) after 300 cycles,and retains capacity of~200 mA h g^(-1) at a high current rate of 4 A g^(-1),thus demonstrating their potential in high-performance battery applications.

关键词： Molybdenum disulfide Sodium-ion battery Hybrid Finite element modeling

A Blockchain-Based Flexible Data Auditing Scheme for the Cloud Service

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Chinese Journal of Electronics 2021年第6期30卷 1159-1166页

作者： FAN Kefeng LI Fei yu haiyang YANG Zhen China Electronics Standardization Institute Guangzhou Sequoia DB Co. College of Computer Science Beijing University of Technology

Nowdays, cloud storage technology has become a hot topic, and an increasing number of users are concerned with the security of their data in the *** auditing schemes on the cloud are proposed and the introduction of a third-party auditor to assist users in verifying the integrity of cloud data. As a centralized node, the third-party auditor has to communicate with all cloud users and cloud service providers, which becomes the bottleneck of the whole scheme. To solve this problem,we design a blockchain-based flexible cloud data auditing scheme. In our scheme, a decentralized auditing framework is proposed to eliminate the dependency on the thirdparty auditor, which increases the stability, security and performance of the whole scheme. Since the cloud service provider can automatically generates auditing proofs, our scheme can relieve the communication burdens of the cloud service provider. The proposed scheme also adapts the Merkle Hash tree to improve the verification *** analysis and experiments show that the proposed scheme is secure and has better stability and verification efficiency.

关键词： auditing schemes blockchain-based flexible data auditing scheme cloud users third-party auditor cloud service provider auditing decentralized auditing framework cloud storage technology security of data cloud computing data integrity storage management blockchain-based flexible cloud data

On Distributed Object Storage Architecture Based on Mimic Defense

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China Communications 2021年第8期18卷 109-120页

作者： haiyang yu Hui Li Xin Yang Huajun Ma Shenzhen Graduate School Peking UniversityShenzhen 518055China Shenzhen Key Lab of Information Theory&Future Network Arch. Shenzhen 518055China

With the advent of the era of big data,cloud computing,Internet of things,and other information industries continue to *** is an increasing amount of unstructured data such as pictures,audio,and video on the *** the distributed object storage system has become the mainstream cloud storage *** the increasing number of distributed applications,data security in the distributed object storage system has become the *** the distributed object storage system,traditional defenses are means that fix discovered system vulnerabilities and backdoors by patching,or means to modify the corresponding structure and ***,these two kinds of means are hysteretic and hardly deal with unknown security *** on mimic defense theory,this paper constructs the principle framework of the distributed object storage system and introduces the dynamic redundancy and heterogeneous function in the distributed object storage system architecture,which increases the attack cost,and greatly improves the security and availability of data.

关键词： distributed object storage system mimic defense data security

Distributed Sparse Signal Estimation in Sensor Networks Using H_∞-Consensus Filtering

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IEEE/CAA Journal of Automatica Sinica 2014年第2期1卷 149-154页

作者： haiyang yu Yisha Liu Wei Wang Research Center of Information and Control Dalian University of Technology School of Information Science and Technology Dalian Maritime University

This paper is concerned with the sparse signal recovery problem in sensor networks, and the main purpose is to design a filter for each sensor node to estimate a sparse signal sequence using the measurements distributed over the whole network. A so-called 1-regularized H_∞filter is established at first by introducing a pseudo-measurement equation, and the necessary and sufficient condition for existence of this filter is derived by means of Krein space Kalman *** embedding a high-pass consensus filter into 1-regularized H∞filter in information form, a distributed filtering algorithm is developed, which ensures that all node filters can reach a consensus on the estimates of sparse signals asymptotically and satisfy the prescribed H∞performance constraint. Finally, a numerical example is provided to demonstrate effectiveness and applicability of the proposed method.

关键词： Kalman filters Sensors Estimation Mathematical model Sparse matrices Covariance matrices

A robust RGB-D visual odometry with moving object detection in dynamic indoor scenes

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IET Cyber-Systems and Robotics 2023年第1期5卷 79-88页

作者： Xianglong Zhang haiyang yu Yan Zhuang College of Mechanical and Electronic Engineering Dalian Minzu UniversityDalianChina School of Control Science and Engineering Dalian University of TechnologyDalianChina

Simultaneous localisation and mapping(SLAM)are the basis for many robotic *** the front end of SLAM,visual odometry is mainly used to estimate camera *** dynamic scenes,classical methods are deteriorated by dynamic objects and cannot achieve satisfactory *** order to improve the robustness of visual odometry in dynamic scenes,this paper proposed a dynamic region detection method based on RGBD ***,all feature points on the RGB image are classified as dynamic and static using a triangle constraint and the epipolar geometric constraint ***,the depth image is clustered using the K-Means *** classified feature points are mapped to the clustered depth image,and a dynamic or static label is assigned to each cluster according to the number of dynamic feature ***,a dynamic region mask for the RGB image is generated based on the dynamic clusters in the depth image,and the feature points covered by the mask are all *** remaining static feature points are applied to estimate the camera ***,some experimental results are provided to demonstrate the feasibility and performance.

关键词： dynamic indoor scenes moving object detection RGB-D SLAM visual odometry

Hydrogen trapping and diffusion in polycrystalline nickel:The spectrum of grain boundary segregation

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Journal of Materials Science & Technology 2024年第6期173卷 225-236页

作者： yu Ding haiyang yu Meichao Lin Michael Ortiz Senbo Xiao Jianying He Zhiliang Zhang Department of Structural Engineering Norwegian University of Science and Technology(NTNU)Trondheim 7491Norway Division of Applied Mechanics Department of Materials Science and EngineeringUppsala UniversityUppsala 75121Sweden Graduate Aerospace Laboratories California Institute of Technology1200 E.California Blvd.PasadenaCA 91125USA

Hydrogen as an interstitial solute at grain boundaries(GBs)can have a catastrophic impact on the mechanical properties of many *** the global research effort,the underlying hydrogen-GB interactions in polycrystals remain inadequately *** this study,using Voronoi tessellations and atomistic simulations,we elucidate the hydrogen segregation energy spectrum at the GBs of polycrystalline nickel by exploring all the topologically favorable segregation *** distinct peaks in the energy spectrum are identified,corresponding to different structural *** first peak(-0.205 eV)represents the most favorable segregation sites at GB core,while the second and third peaks account for the sites at GB *** incorporating a thermodynamic model,the spectrum enables the determination of the equilibrium hydrogen concentrations at GBs,unveiling a remarkable two to three orders of magnitude increase compared to the bulk hydrogen concentration reported in experimental *** identified structures from the GB spectrum exhibit vastly different behaviors in hydrogen segregation and diffusion,with the low-barrier channels inside GB core contributing to short-circuit diffusion,while the high energy gaps between GB and neighboring lattice serving as on-plane diffusion *** square displacement analysis further confirms the findings,and shows that the calculated GB diffusion coefficient is three orders of magnitude greater than that of *** present study has a significant implication for practical applications since it offers a tool to bridge the gap between atomic-scale interactions and macroscopic behaviors in engineering materials.

关键词： Hydrogen embrittlement Grain boundaries Impurity segregation Polycrystal Atomistic simulations

Enhancing cell adhesive and antibacterial activities of glass-fibre-reinforced polyetherketoneketone through Mg and Ag PIII

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Regenerative Biomaterials 2023年第1期10卷 1278-1293页

作者： Xin Tan Zhongyi Wang Xin Yang Ping yu Manlin Sun yuwei Zhao haiyang yu State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengduChina Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences College of StomatologyChongqing Medical UniversityChongqingChina Jiangsu Key Laboratory of Oral Diseases Affiliated Hospital of StomatologyNanjing Medical UniversityNanjingChina Department of Stomatology Chengdu Second People’s HospitalChengduChina

Glass-fibre-reinforced polyetherketoneketone(PEKK-GF)shows great potential for application as a dental implant restoration material;however,its surface bioinertness and poor antibacterial properties limit its integration with peri-implant soft tissue,which is critical in the long-term success of implant ***,functional magnesium(Mg)and silver(Ag)ions were introduced into PEKK-GF by plasma immersion ion implantation(PIII).Surface characterization confirmed that the surface morphology of PEKK-GF was not visibly affected by PIII *** tests revealed that PIII changed the wettability and electrochemical environment of the PEKK-GF surface and enabled the release of Mg^(2+)and Ag^(+)modulated by Giavanni *** vitro experiments showed that Mg/Ag PIII-treated PEKK-GF promoted the proliferation and adhesion of human gingival fibroblasts and upregulated the expression of adhesion-related genes and *** addition,the treated samples inhibited the metabolic viability and adhesion of Streptococcus mutans and Porphyromonas gingivalis on their surfaces,distorting bacterial ***/Ag PIII surface treatment improved the soft tissue integration and antibacterial activities of PEKK-GF,which will further support and broaden its adoption in dentistry.

关键词： glass-fibre-reinforced polyetherketoneketone plasma immersion ion implantation human gingival fibroblasts antibacterial activity

A Novel Vascular Disrupting Agents Noncovalent Polymeric Nanomedicine:Significantly Increased Antitumor Therapeutic Efficiency

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Chinese Journal of Chemistry 2022年第12期40卷 1447-1456页

作者： Jianlin Lv Yajun Xu yue Huang haiyang yu Zhaohui Tang Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefeiAnhui 230026China Jilin Biomedical Polymers Engineering Laboratory 5625 Renmin StreetChangchunJilin 130022China

This work was supported by the National Natural Science Foundation of China(Nos.52025035,52103195).The comprehensive graphic content and graphic abstract were created with *** by coauthors.

关键词： Vascular disrupting agents Antitumor agents Self-assembly Cancer Nanoparticles

Extragalactic HⅠSurvey with FAST:First Look at the Pilot Survey Results

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Research in Astronomy and Astrophysics 2022年第6期22卷 215-233页

作者： Jiangang Kang Ming Zhu Mei Ai haiyang yu Chun Sun National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China CAS Key Laboratory of FAST National FASTNational Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Beijing Normal University Beijing 100875China

We present the first data release of HⅠsources extracted from a pilot extragalactic survey using the Five-hundredmeter Aperture Spherical radio Telescope(FAST).We extracted sources from three-dimensional(3D)spectral data cubes datacubes to perform interactive searching and computing,yielding global parameters for each source,extending redshift ranges of HⅠemission up to z=0.04.A total of 544 extragalactic HⅠsources has been detected by the pilot FAST HⅠdrift scan survey covering part of the sky region in R.A.(***α)and decl.(***δ)range 00^(h)47^(m)6.5;(2)61 sources with 5.1■S/N■6.5;(3)28 sources with relatively poor baselines;(4)33 sources that are partly masked by strong radio frequency interferences(RFIs).In addition,we find 16 HⅠsources that have not been matched with any counterparts in the existing galaxy *** data release can provide guidance for the future extragalactic HⅠsurvey with FAST.

关键词： galaxies formation-radio lines galaxies-surveys-galaxies distances and redshifts-radiation dynamics-galaxies evolution