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Fabrication of layered structure VS4 anchor in 3D graphene aerogels as a new cathode material for lithium ion batteries

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Frontiers in Energy 2019年第3期13卷 597-602页

作者： Lijun WU yu ZHANG Bingjiang LI Pengxiang WANG Lishuang FAN Naiqing ZHANG Kening sun State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China School of Chemistry and Chemical Engineering Academy of Fundamental and Interdisciplinary SciencesHarbin Institute of TechnologyHarbin 150001China

VS4 has gained more and more attention for its high theoretical capacity (449 mAh/g with 3e^- transfer) in lithium ion batteries (LIBs). Herein, a layered structure VS4 anchored in graphene aerogels is prepared and first reported as cathode material for LIBs. VS4@GAs composite exhibits an exceptional high initial reversible capacity (511 mAh/g), an excellent high-rate capability (191 mAh/g at the 5 C), and an excellent cyclic stability (239 mAh/g after 15 cycles).

关键词： VS4 graphene aerogels cathode lithium storage

Neoadjuvant Immunotherapy for Head and Neck Squamous Cell Carcinoma:Expecting Its Application in Temporal Bone Squamous Cell Carcinoma

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Current Medical Science 2023年第2期43卷 213-222页

作者： Meng-wen SHI Jing HUANG Yu Sun Department of Otorhinolaryngology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China Cancer Center Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China

Temporal bone malignant tumors are characterized by atypical clinical symptoms,and easy recurrence and metastasis.They account for 0.2%of head and neck tumors,and the most common pathological type is squamous cell carcinoma.Patients with squamous cell carcinoma of the temporal bone are often at advanced stages when diagnosed,and lose the chance for surgery.Neoadjuvant immunotherapy has recently been approved as the first-line treatment for refractory recurrent/metastatic squamous cell carcinoma of the head and neck.However,it remains to be determined whether neoadjuvant immunotherapy can be used as the first-line treatment for temporal bone squamous cell carcinoma to reduce the tumor stage before surgery,or as a palliative treatment for patients with unresectable advanced stage carcinoma.The present study reviews the development of immunotherapy and its clinical application in head and neck squamous cell carcinoma,summarizes the treatment of temporal bone squamous cell carcinoma,and prospects the neoadjuvant immunotherapy as the first-line treatment for temporal bone squamous cell carcinoma.

关键词： neoadjuvant immunotherapy programmed cell death-1 head and neck squamous cell carcinoma temporal bone squamous cell carcinoma

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微纳操作与表征

Engineering 2023年第5期24卷 1-2,I0001页

作者： Yu Sun Sergej Fatikow Xinyu Liu Department of Mechanical and Industrial Engineering University of TorontoTorontoON M5S 3G8Canada Institute for Microrobotics and Control Engineering University of OldenburgOldenburg D-26129Germany

Technologies for manipulating micro-and nanometer-sized objects(e.g., biological cells, small organisms, biomolecules, and nanomaterials) and characterizing their physical and chemical properties play important roles in a variety of disciplines such as biology, medicine, microsystems engineering, and nanotechnology.Inventing micro and nano manipulation and characterization techniques requires the seamless integration of multidisciplinary expertise in microphysics, micro/nano device design and fabrication, small-scale robotics, and micro/nano instrumentation.

关键词： materials sized nanotechnology

Synthesis of Stimuli-Responsive Block Copolymers and Block Copolymer Nano-assemblies

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Chinese Journal of Chemistry 2022年第8期40卷 965-972页

作者： yuan Liu Yu Sun Wangqing Zhang Key Laboratory of Functional Polymer Materials of the Ministry of Education Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China

Block copolymers have aroused much interest,and their application has been rapidly expanded.In recent years,our group has committed to exploring synthesis and self-assembly of block copolymers.We have designed and synthesized several new thermo-responsive polymers and photo-responsive polymers by living/controlled radical polymerization(LCRP)and investigated their stimuli-responsive properties.Aiming at convenient and efficient synthesis of block copolymer nano-assemblies,we have developed several methods based on polymerization-induced self-assembly(PISA).Herein,we give a short summary of our research in these years.The aim of this account is to stimulate innovative synthesis strategies of block copolymer nano-assemblies,and promote more scientific research cooperation to face the exciting opportunities and challenges encountered in block copolymers.

关键词： Block copolymers Living/controlled radical polymerization(LCRP) Stimuli-responsive Self-assembly Nanostructures

Persistent Variations in the East Asian Trough from March to April and the Possible Mechanism

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Advances in Atmospheric Sciences 2024年第4期41卷 737-753,I0002-I0004页

作者： Shui yu Jianqi sun Nansen-Zhu International Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

The East Asian trough(EAT)profoundly influences the East Asian spring climate.In this study,the relationship of the EATs among the three spring months is investigated.Correlation analysis shows that the variation in March EAT is closely related to that of April EAT.Extended empirical orthogonal function(EEOF)analysis also confirms the co-variation of the March and April EATs.The positive/negative EEOF1 features the persistent strengthened/weakened EAT from March to April.Further investigation indicates that the variations in EEOF1 are related to a dipole sea surface temperature(SST)pattern over the North Atlantic and the SST anomaly over the tropical Indian Ocean.The dipole SST pattern over the North Atlantic,with one center east of Newfoundland Island and another east of Bermuda,could trigger a Rossby wave train to influence the EAT in March−April.The SST anomaly over the tropical Indian Ocean can change the Walker circulation and influence the atmospheric circulation over the tropical western Pacific,subsequently impacting the southern part of the EAT in March−April.Besides the SST factors,the Northeast Asian snow cover could change the regional thermal conditions and lead to persistent EAT anomalies from March to April.These three impact factors are generally independent of each other,jointly explaining large variations in the EAT EEOF1.Moreover,the signals of the three factors could be traced back to February,consequently providing a potential prediction source for the EAT variation in March and April.

关键词： spring East Asian trough sea surface temperature snow cover

Declined trends of chlorophyll a in the South China Sea over 2005–2019 from remote sensing reconstruction

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Acta Oceanologica Sinica 2023年第1期42卷 12-24页

作者： Tianhao Wang Yu Sun Hua Su Wenfang Lu School of Marine Sciences Sun Yat-Sen UniversityZhuhai519000China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519000China College of Ocean and Earth Sciences Xiamen UniversityXiamen361102China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen361102China Key Laboratory of Spatial Data Mining and Information Sharing of Ministry of Education Fuzhou UniversityFuzhou350108China National&Local Joint Engineering Research Center of Satellite Geospatial Information Technology Fuzhou UniversityFuzhou350108China

Chlorophyll a concentration(CHL)is an important proxy of the marine ecological environment and phytoplankton production.Long-term trends in CHL of the South China Sea(SCS)reflect the changes in the ecosystem’s productivity and functionality in the regional carbon cycle.In this study,we applied a previously reconstructed 15-a(2005–2019)CHL product,which has a complete coverage at 4 km and daily resolutions,to analyze the long-term trends of CHL in the SCS.Quantile regression was used to elaborate on the long-term trends of high,median,and low CHL values,as an extended method of conventional linear regression.The results showed downward trends of the SCS CHL for the 75th,50th,and 25th quantile in the past 15 a,which were−0.0040 mg/(m^(3)·a)(−1.62%per year),−0.0023 mg/(m^(3)·a)(−1.10%per year),and−0.0019 mg/(m^(3)·a)(−1.01%per year).The negative trends in winter(November to March)were more prominent than those in summer(May to September).In terms of spatial distribution,the downward trend was more significant in regions with higher CHL.These led to a reduced standard deviation of CHL over time and space.We further explored the influence of various dynamic factors on CHL trends for the entire SCS and two typical systems(winter Luzon Strait(LZ)and summer Vietnam Upwelling System(SV))with single-variate linear regression and multivariate Random Forest analysis.The multivariate analysis suggested the CHL trend pattern can be best explained by the trends of wind speed and mixed-layer depth.The divergent importance of controlling factors for LZ and SV can explain the different CHL trends for the two systems.This study expanded our understanding of the long-term changes of CHL in the SCS and provided a reference for investigating changes in the marine ecosystem.

关键词： chlorophyll a concentration quantile trends remote sensing reconstruction South China Sea

Comprehensive kinetostatic modeling and morphology characterization of cable-driven continuum robots for in-situ aero-engine maintenance

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Frontiers of Mechanical Engineering 2023年第3期18卷 99-121页

作者： Zheshuai YANG Laihao YANG Yu Sun Xuefeng CHEN School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049China

In-situ maintenance is of great significance for improving the efficiency and ensuring the safety of aero-engines.The cable-driven continuum robot(CDCR)with twin-pivot compliant mechanisms,which is enabled with flexible deformation capability and confined space accessibility,has emerged as a novel tool that aims to promote the development of intelligence and efficiency for in-situ aero-engine maintenance.The high-fidelity model that describes the kinematic and morphology of CDCR lays the foundation for the accurate operation and control for in-situ maintenance.However,this model was not well addressed in previous literature.In this study,a general kinetostatic modeling and morphology characterization methodology that comprehensively contains the effects of cable-hole friction,gravity,and payloads is proposed for the CDCR with twin-pivot compliant mechanisms.First,a novel cable-hole friction model with the variable friction coefficient and adaptive friction direction criterion is proposed through structure optimization and kinematic parameter analysis.Second,the cable-hole friction,all-component gravities,deflection-induced center-of-gravity shift of compliant joints,and payloads are all considered to deduce a comprehensive kinetostatic model enabled with the capacity of accurate morphology characterization for CDCR.Finally,a compact continuum robot system is integrated to experimentally validate the proposed kinetostatic model and the concept of in-situ aero-engine maintenance.Results indicate that the proposed model precisely predicts the morphology of CDCR and outperforms conventional models.The compact continuum robot system could be considered a novel solution to perform in-situ maintenance tasks of aero-engines in an invasive manner.

关键词： kinetostatic modeling morphology characterization variable friction continuum robots in-situ maintenance

OTFS-Based Efficient Handover Authentication Scheme with Privacy-Preserving for High Mobility Scenarios

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China Communications 2023年第1期20卷 36-49页

作者： Dawei Li Di Liu Yu Sun Jianwei Liu School of Cyber Science and Technology Beihang UniversityBeijing 100191China

Handover authentication in high mobility scenarios is characterized by frequent and shortterm parallel execution.Moreover,the penetration loss and Doppler frequency shift caused by high speed also lead to the deterioration of network link quality.Therefore,high mobility scenarios require handover schemes with less handover overhead.However,some existing schemes that meet this requirement cannot provide strong security guarantees,while some schemes that can provide strong security guarantees have large handover overheads.To solve this dilemma,we propose a privacy-preserving handover authentication scheme that can provide strong security guarantees with less computational cost.Based on Orthogonal Time Frequency Space(OTFS)link and Key Encapsulation Mechanism(KEM),we establish the shared key between protocol entities in the initial authentication phase,thereby reducing the overhead in the handover phase.Our proposed scheme can achieve mutual authentication and key agreement among the user equipment,relay node,and authentication server.We demonstrate that our proposed scheme can achieve user anonymity,unlinkability,perfect forward secrecy,and resistance to various attacks through security analysis including the Tamarin.The performance evaluation results show that our scheme has a small computational cost compared with other schemes and can also provide a strong guarantee of security properties.

关键词： high mobility condition handover authentication privacy-preserving Tamarin OTFS

Trajectory Predictions with Details in a Robotic Twin-Crane System

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Complex System Modeling and Simulation 2022年第1期2卷 1-17页

作者： Ning Zhao Gabriel Lodewijks Zhuorui Fu Yu Sun yue sun School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China School of Aviation University of New South WalesSydney 2052Australia

Nowadays,more automated or robotic twin-crane systems(RTCSs)are employed in ports and factories to improve material handling efficiency.In a twin-crane system,cranes must travel with a minimum safety distance between them to prevent interference.The crane trajectory prediction is critical to interference handling and crane scheduling.Current trajectory predictions lack accuracy because many details are simplified.To enhance accuracy and lessen the trajectory prediction time,a trajectory prediction approach with details(crane acceleration/deceleration,different crane velocities when loading/unloading,and trolley movement)is proposed in this paper.Simulations on different details and their combinations are conducted on a container terminal case study.According to the simulation results,the accuracy of the trajectory prediction can be improved by 20%.The proposed trajectory prediction approach is helpful for building a digital twin of RTCSs and enhancing crane scheduling.

关键词： twin-crane systems trajectory prediction acceleration velocity interference