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Cooperative structure of Li/Ni mixing and stacking faults for achieving high-capacity Co-free Li-rich oxides

Journal of Energy Chemistry 2024年第8期95卷 315-324,I0007页

作者： Zhen Wu Yu-Han Zhang Hao Wang Zewen Liu Xudong Zhang Xin Dai Kunyang Zou Xiaoming Lou Xuechen Hu Lijing Ma Yan Liu Yongning Liu State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101ShandongChina Hefei Advanced Computing center Operation management corp.Ltd Hefei 230088AnhuiChina center for High Performance Computing Network Information CenterXi’an Jiaotong UniversityXi’an 710049ShaanxiChina Wuhan Dongfeng Motor corp.ration Ltd Wuhan 430056HubeiChina School of Materials Science and Intelligent Engineering Nanjing UniversitySuzhou 215163JiangsuChina Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjing 210096JiangsuChina International Research center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

Co-free Li-rich layered oxides(LLOs)are emerging as promising cathode materials for Li-ion batteries due to their low cost and high ***,they commonly face severe structural instability and poor electrochemical activity,leading to diminished capacity and voltage ***,we introduce a Co-free LLO,Li_(1.167)Ni_(0.222)Mn_(0.611)O_(2)(Cf-L1),which features a cooperative structure of Li/Ni mixing and stacking *** structure regulates the crystal and electronic structures,resulting in a higher discharge capacity of 300.6 mA h g^(-1)and enhanced rate capability compared to the typical Co-free LLO,Li_(1.2)Ni_(0.2)Mn_(0.6)O_(2)(Cf-Ls).Density functional theory(DFT)indicates that Li/Ni mixing in LLOs leads to increased Li-O-Li configurations and higher anionic redox activities,while stacking faults further optimize the electronic interactions of transition metal(TM)3d and non-bonding O 2p ***,stacking faults accommodate lattice strain,improving electrochemical reversibility during charge/discharge cycles,as demonstrated by the in situ XRD of Cf-L1 showing less lattice evolution than *** study offers a structured approach to developing Co-free LLOs with enhanced capacity,voltage,rate capability,and cyclability,significantly impacting the advancement of the next-generation Li-ion batteries.

关键词： Co-free Li-rich oxides Li/Ni mixing Stacking faults Electronic structure

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Least Absolute Deviation Estimation of Autoregressive Conditional Duration Model

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Acta Mathematicae Applicatae Sinica 2011年第2期27卷 243-254页

作者： Wei Liu Hui-min Wang Min Chen Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China Business School Hohai University Nanjing 210098 China information management center of china minsheng banking corp. Ltd. Beijing 100873 China

This paper studies the least absolute deviation estimation of the high frequency financial autoregressive conditional duration （ACD） model. The asymptotic properties of the estimator are studied given mild regularity conditions. Furthermore, we develop a Wald test statistic for the linear restriction on the parameters. A simulation study is conducted for the finite sample properties of our estimator. Finally, we give an empirical study of financial duration.

关键词： least absolute deviation estimation ACD model heavy tail

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Energy Efficient Backoff Hierarchical Clustering Algorithms for Multi-Hop Wireless Sensor Networks

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Journal of Computer Science & Technology 2011年第2期26卷 283-291页

作者：王珺曹涌涛谢俊元陈世福 State Key Lab for Novel Software Technology at Nanjing University Department of Computer Science and Technology Nanjing University Institute of Communication and information Engineering Nanjing University of Posts and Telecommunications china Development center Trend Micro Corp.

Compared with flat routing protocols, clustering is a fundamental performance improvement technique in wireless sensor networks, which can increase network scalability and lifetime. In this paper, we integrate the multi-hop technique with a backoff-based clustering algorithm to organize sensors. By using an adaptive backoff strategy, the algorithm not only realizes load balance among sensor node, but also achieves fairly uniform cluster head distribution across the network. Simulation results also demonstrate our algorithm is more energy-efficient than classical ones. Our algorithm is also easily extended to generate a hierarchy of cluster heads to obtain better network management and energy-efficiency.

关键词： multi-hop wireless sensor network clustering algorithm backoff strategy

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An Event Analysis of Bitcoin Based on a Novel DRE Methods

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Journal of Systems Science and information 2023年第2期11卷 139-159页

作者： Yao YUE Yuying SUN Kuo YANG Shouyang WANG School of Economics and management University of Chinese Academy of SciencesBeijing 100190China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190ChinaCenter for Forecasting ScienceChinese Academy of SciencesBeijing 100190China minsheng Financial Leasing Co. Ltd.Shanghai 210000China School of Economics and management University of Chinese Academy of SciencesBeijing 100190ChinaAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190ChinaCenter for Forecasting ScienceChinese Academy of SciencesBeijing 100190China

Since Bitcoin came into the world,modelling and analyzing the underlying characteristics of Bitcoin has attracted increasing *** paper uses a framework including decomposition,reconstruction and extraction method(DRE)to analyze price fluctuations based on ultra-high-frequency data from Dec.1,2019,to Nov.30,***,the ensemble mode decomposition(EMD)is employed to decompose the Bitcoin hourly spot price into 13 intrinsic mode functions(IMF)plus a ***,the IMFs are reconstructed into high-frequency components,low-frequency components and a trend based on fine-to-coarse ***,the intraday volatility analysis based on LM test is applied on 15-minutes frequency data to detect discontinuous jump arrivals and extract jump from realized quadratic *** results show that three components of reconstruction can be identified as short term fluctuations process caused by microstructure noise,the shocks affected by major events,and a long-term trend based on inelastic supply and rigid *** find that approximately 40%of jumps can be matched with the news from the public news database(Factiva),and the jump sizes are larger than that of stock *** finding indicates that the Bitcoin market has more irregularly noise and unforeseen shocks from unscheduled events.

关键词： Bitcoin EMD jump realized variation

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Coal mine gas monitoring system based on wireless sensor network

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Journal of Coal Science & Engineering(china) 2007年第1期13卷 107-111页

作者：王建王汝琳王学民沈传河 Shool of Mechanical Electronic ＆ information Engineering China University of Mining ＆Technology（Beijing） Beijing 100083 China School of Chemical and Environment Engineering China University of Mining ＆ Technology（Beijing） Beijing 100083 China Xinwen Mining Group corp. Tai＇an 271233 China Department of Economic management Shandong University of Science ＆ Technology Tai＇an 271000 China

Based on the nowadays＇ condition, it is urgent that the gas detection cable communication system must be replaced by the wireless communication systems. The wireless sensors distributed in the environment can achieve the intelligent gas monitoring system. Apply with multilayer data fuse to design working tactics, and import the artificial neural networks to analyze detecting result. The wireless sensors system communicates with the control center through the optical fiber cable. All the gas sensor nodes distributed in coal mine are combined into an intelligent, flexible structure wireless network system, forming coal mine gas monitoring system based on wireless sensor network.

关键词： gas communication system wireless sensor network data fuse artificial neural networks

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Collaborative Network Security in Multi-Tenant Data center for Cloud Computing

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Tsinghua Science and Technology 2014年第1期19卷 82-94页

作者： Zhen Chen Wenyu Dong Hang Li Peng Zhang Xinming Chen Junwei Cao Research Institute of information Technology and Tsinghua National Lab for information Science and Technology Tsinghua University Department of Computer Science and Technology Tsinghua University Department of Computer Science and Technology PLA Univ. of Info. & Eng. Department of Electronic and information Engineering Xi’an Jiaotong University Department of Electrical and Computer Engineering University of Massachusetts

A data center is an infrastructure that supports Internet service. Cloud comput the face of the Internet service infrastructure, enabling even small organizations to quickly ng is rapidly changing build Web and mobile applications for millions of users by taking advantage of the scale and flexibility of shared physical infrastructures provided by cloud computing. In this scenario, multiple tenants save their data and applications in shared data centers, blurring the network boundaries between each tenant in the cloud. In addition, different tenants have different security requirements, while different security policies are necessary for different tenants. Network virtualization is used to meet a diverse set of tenant-specific requirements with the underlying physical network enabling multi-tenant datacenters to automatically address a large and diverse set of tenants requirements. In this paper, we propose the system implementation of vCNSMS, a collaborative network security prototype system used n a multi-tenant data center. We demonstrate vCNSMS with a centralized collaborative scheme and deep packet nspection with an open source UTM system. A security level based protection policy is proposed for simplifying the security rule management for vCNSMS. Different security levels have different packet inspection schemes and are enforced with different security plugins. A smart packet verdict scheme is also integrated into vCNSMS for ntelligence flow processing to protect from possible network attacks inside a data center network

关键词： data center network network security software defined network collaborative network security multi- tenant network virtualization intelligent flow processing cloud computing

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The effects of information platform-based nursing on preventing venous thromboembolism in patients with hip fractures

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Chinese Journal of Traumatology 2022年第6期25卷 367-374页

作者： Yuan Gao Xiao-Jie Fu Ming-Xing Lei Peng-Bin Yin Yu-Tong Meng Qing-Mei Wang Hong-Ying Pi Nursing Department The First Medical Center of Chinese PLA GeneralBeijing100853China Department of Orthopedics The First Medical Center of Chinese PLA General HospitalBeijing100853China Department of Orthopedics Beijing ChaoYang HospitalCapital Medical UniversityBeijing100020China Health Service Training center of PLA General Hospital Beijing100853China

Purpose:Venous thromboembolism(VTE)is a major health issue among hip fracture *** study aimed to develop an information platform based on a mobile application and then evaluate whether information platform-based nursing could improve patient’’s drug compliance and reduce the incidence of VTE in hip fracture ***:This study retrospectively analyzed hip fracture patients who were treated with conventional prevention and intervention methods for VTE(control group)between January 2008 and November 2012,and prospectively analyzed hip fracture patients who were treated with nursing intervention based on the information platform(study group)between January 2016 and September *** the patients included in the both groups were hip fracture patients who had an age over 50 years,treated with surgery,and hospitalized≥48 *** were excluded if they admitted to hospital due to old fractures,had a severe bleeding after 72 h of admission,diagnosed with any type of VTE,or refused to participate in the *** information platform was divided into medical,nursing,and patient *** on the information platform,medical practitioners and nurses could perform risk assessments,monitoring management and early warnings,preventions and treatments,health educations,follow-up,and other aspects of nursing interventions for *** study compared essential characteristics,drug compliance,VTE occurrence,and mean length of hospitalization between the two ***,a subgroup analysis was performed in the study group according to different drug *** 18.0 software(IBM corp.,NY,and USA)was used for statistical ***:Altogether 1177 patients were included in the control group,and 491 patients in the study *** baseline data,patients in the study group had more morbidities than those in the control group(p<0.05).The difference of drug compliance between the two groups was statistically significant(p<0.001):761(64.7%)

关键词： Venous thromboembolism Hip fractures information platform-based nursing Drug compliance Risk assessment and management

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