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Recent progress of in-situ characterization of LiNi_(1−x−y)Co_(x)Mn_(y)O_(2) cathodes for lithium metal batteries: A mini review

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Nano Research 2024年第3期17卷 1384-1401页

作者： Huanzhu Lv Xiaoqi Zhu Jun Mei Yuanhua Xia Bin Wang Institute of Fundamental and Frontier Science University of Electronic Science and Technology of ChinaChengdu 611731China Chengdu Development Center of Science and Technology China Academy of Engineering PhysicsChengdu 610200China Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics(CAEP)Mianyang 621999China

In the context of the gradual popularity of electric vehicles(EVs),the development of lithium battery systems with high energy density and power density is regarded as the foremost way to improve the range of ***_(1-x-y)Co_(x)Mn_(y)O_(2)(NCM)cathodes have been the focus of researchers due to their high energy density,excellent power performance,and low-temperature ***,the elaboration of the decay mechanism of NCM cathode based on lithium metal batteries(LMBs)is still being restricted to the primary *** the past decades,the development and application of advanced in-situ characterization tools have facilitated researchers'understanding of the internal operation mechanism of batteries during charging and *** this minireview,the latest progress of in-situ observation of the NCM cathode by X-ray diffraction(XRD),fourier transform infrared(FT-IR)spectroscopy,Raman spectroscopy,atomic force microscopy(AFM),transmission electron microscope(TEM),optical microscope,and other characterization tools is *** mechanisms of structural degradation,cathode-electrolyte interfaces(CEIs)composition,and dynamic changes of NCM,electrolyte breakdown,and gas production are ***,based on the existing research progress,the opportunities and challenges for future in-situ characterization technology in the study of the mechanism of LMBs are discussed in ***,the purpose of this minireview is to summarize recent work that focuses on the outstanding application of in-situ characterization techniques in the mechanistic study of LMBs,and pointing the way to the future development of high energy density and power density LMBs systems.

关键词： lithium metal batteries(LMBs) In-situ characterization LiNi_(1-x-y)Co_(x)Mn_(y)O_(2)(NCM)

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Entity generation algorithm based on reference expansion

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Journal of Electronic science and technology 2023年第3期21卷 63-72页

作者： Jia-Jia Ruan Xi-Xu He Min Zhang Yuan Gao Office of Scientific Research&Development University of Electronic Science and Technology of ChinaChengdu611731China School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu611731China Information Center University of Electronic Science and Technology of ChinaChengdu611731China Archives University of Electronic Science and Technology of ChinaChengdu611731China

The extraction and understanding of text knowledge become increasingly crucial in the age of big *** of the current research areas in the field of natural language processing(NLP)is how to accurately understand the text and collect accurate linguistic information because Chinese vocabulary is diverse and *** paper mainly studies the candidate entity generation module of the entity link *** candidate entity generation module constructs an entity reference expansion algorithm to improve the recall rate of candidate *** order to improve the efficiency of the connection algorithm of the entire system while ensuring the recall rate of candidate entities,we design a graph model filtering algorithm that fuses shallow semantic information to filter the list of candidate entities,and verify and analyze the efficiency of the algorithm through *** analyzing the related technology of the entity linking algorithm,we study the related technology of candidate entity generation and entity disambiguation,improve the traditional entity linking algorithm,and give an innovative and practical entity linking *** recall rate exceeds 82%,and the link accuracy rate exceeds 73%.Efficient and accurate entity linking can help machines to better understand text semantics,further promoting the development of NLP and improving the users’knowledge acquisition experience on the text.

关键词： Chinese Wikipedia Entity reference expansion Graph model

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Energy-efficient computation offloading assisted by RIS-based UAV

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The Journal of China Universities of Posts and Telecommunications 2024年第1期31卷 37-48页

作者： Li Linpei Zhao Chuan Su Yu Huo Jiahao Huang Yao Li Haojin School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China Research Department of 5G and Drone China Mobile(Chengdu)Institute of Research and DevelopmentChengdu 610200China College of Communication Engineering Chengdu University of Information TechnologyChengdu 610225China Research and Development Center Sony(China)LimitedBeijing 100027China

The new applications surge with the rapid evolution of the mobile *** explosive growth of the data traffic aroused by the new applications has posed great computing pressure on the local *** is essential to innovate the computation offloading methods to alleviate the local computing burden and improve the offloading *** edge computing(MEC)assisted by reflecting intelligent surfaces(RIS)-based unmanned aerial vehicle(UAV)is a promising method to assist the users in executing the computation tasks in proximity at low *** this paper,we propose an energy-efficient MEC system assisted by RIS-based UAV,where the UAV with RIS mounted relays the computation tasks to the MEC *** energy efficiency maximization problem is formulated by jointly optimizing the UAV's trajectory,the transmission power of all users,and the phase shifts of the reflecting elements placed on the *** that the optimization problem is non-convex,we propose a deep deterministic policy gradient(DDPG)-based *** combining the DDPG algorithm with the energy efficiency maximization problem,the optimization problem can be ***,the numerical results are illustrated to show the performance of the system and the superiority compared with the benchmark schemes.

关键词： mobile edge computing unmanned aerial vehicle reflecting intelligent surface

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Mechanoluminescent-Triboelectric Bimodal Sensors for Self-Powered Sensing and Intelligent Control

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Nano-Micro Letters 2023年第5期15卷 313-325页

作者： Bo Zhou Jize Liu Xin Huang Xiaoyan Qiu Xin Yang Hong Shao Changyu Tang Xinxing Zhang State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan UniversityChengdu 610065People’s Republic of China Chengdu Development Center of Science and Technology China Academy of Engineering PhysicsChengdu 610200People’s Republic of China

Self-powered flexible devices with skin-like multiple sensing ability have attracted great attentions due to their broad applications in the Internet of Things(IoT).Various methods have been proposed to enhance mechano-optic or electric performance of the flexible devices;however,it remains challenging to realize the display and accurate recognition of motion trajectories for intelligent ***,we present a fully self-powered mechanoluminescent-triboelectric bimodal sensor based on micronanostructured mechanoluminescent elastomer,which can patterned-display the force *** deformable liquid metals used as stretchable electrode make the stress transfer stable through overall device to achieve outstanding mechanoluminescence(with a gray value of 107 under a stimulus force as low as 0.3 N and more than 2000 cycles reproducibility).Moreover,a microstructured surface is constructed which endows the resulted composite with significantly improved triboelectric performances(voltage increases from 8 to 24 V).Based on the excellent bimodal sensing performances and durability of the obtained composite,a highly reliable intelligent control system by machine learning has been developed for controlling trolley,providing an approach for advanced visual interaction devices and smart wearable electronics in the future IoT era.

关键词： Bimodal sensors Mechanoluminescence Triboelectric nanogenerator Intelligent control Self-powered

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KSKV:Key-Strategy for Key-Value Data Collection with Local Differential Privacy

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Computer Modeling in Engineering & sciences 2024年第6期139卷 3063-3083页

作者： Dan Zhao Yang You Chuanwen Luo Ting Chen Yang Liu Artificial Intelligence Development Research Center Institute of Scientific and Technical Information of ChinaBeijing100038China Industry Development Department NSFOCUS Inc.BeijingChina School of Information Science and Technology Beijing Forestry UniversityBeijing100083China School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu610054China Institute of Computing Technology China Academy of Railway Sciences Corporation LimitedBeijing10081China

In recent years,the research field of data collection under local differential privacy(LDP)has expanded its focus fromelementary data types to includemore complex structural data,such as set-value and graph ***,our comprehensive review of existing literature reveals that there needs to be more studies that engage with key-value data *** studies would simultaneously collect the frequencies of keys and the mean of values associated with each ***,the allocation of the privacy budget between the frequencies of keys and the means of values for each key does not yield an optimal utility *** the importance of obtaining accurate key frequencies and mean estimations for key-value data collection,this paper presents a novel framework:the Key-Strategy Framework forKey-ValueDataCollection under ***,theKey-StrategyUnary Encoding(KS-UE)strategy is proposed within non-interactive frameworks for the purpose of privacy budget allocation to achieve precise key frequencies;subsequently,the Key-Strategy Generalized Randomized Response(KS-GRR)strategy is introduced for interactive frameworks to enhance the efficiency of collecting frequent keys through group-anditeration *** strategies are adapted for scenarios in which users possess either a single or multiple key-value ***,we demonstrate that the variance of KS-UE is lower than that of existing *** claims are substantiated through extensive experimental evaluation on real-world datasets,confirming the effectiveness and efficiency of the KS-UE and KS-GRR strategies.

关键词： Key-value local differential privacy frequency estimation mean estimation data perturbation

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Synergistic modulation of Li nucleation/growth enabled by CNTswrapped lithiophilic CoP/Co_(2)P decorated hollow carbon polyhedron host for stable lithium metal anodes

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Nano Research 2023年第4期16卷 4961-4969页

作者： Zhicui Song Yuchi Liu Zihao Wang Jianxiong Xing Chaohui Wei Wei Zou Aijun Zhou Jingze Li School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China Research and Development Center Tianqi Lithium Co.Ltd.Chengdu 610093China Lithium Resources and Lithium Materials Key Laboratory of Sichuan Province Tianqi Lithium CorporationChengdu 610000China

Infinite volume expansion and uncontrolled lithium dendrite growth are the main bottlenecks that greatly hinder the commercial application of lithium metal ***,derived from zeolitic imidazolate framework(ZIF)-67,carbon nanotubes(CNTs)-wrapped and CoP/Co_(2)P uniformly distributed nitrogen-doped hollow porous polyhedron carbon(CNT-CoP@NC)is elaborately designed as lithium metal host.A hybrid of N-doping and metallic phosphides modifications improves the lithiophilicity and reduces the nucleation barrier,consequently leading to homogeneous nucleation and smooth deposition of metallic lithium,thus suppresses the growth of Li ***,self-generated CNTs arrays efficiently reduce the local current ***,the reduced lithium is preferentially deposited into the hollow structure of CNT-CoP@NC and then filled the voids among the CNT-CoP@NC *** all-pervasive Li plating design can not only alleviate the volume effect,but also maximize the anode space *** from these synergistic modulations,even with an ultra-thin(7.2μm)anode layer of CNT-CoP@NC host,a high Coulombic efficiency for more than 400 cycles and an extended lifespan of 1,700 h under 1 mA·cm^(−2)can be *** paired with a competitive high mass loading(17.1 mg·cm^(−2))LiFePO4 cathode,a superb cycling stability(126.7 mAh·g^(−1)over 550 cycles)is recorded at 1 C.

关键词： lithium metal anodes metal organic framework hollow structure dendrite-free synergistic modulations

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Unravel the spatio-temporal patterns and their nonlinear relationship with correlates of dockless shared bikes near metro stations

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Geo-Spatial Information science 2023年第3期26卷 577-598页

作者： Zhaomin Tong Yi Zhu Ziyi Zhang Rui An Yaolin Liu Meng Zheng School of Resource and Environmental Science Wuhan UniversityWuhanChina Natural Resources Investigation and Monitoring Section Chengdu Land Planning and Cadastral Affairs CenterChengduChina Faculty of Geomatics East China University of TechnologyNanchangChina Traffic Simulation Center Wuhan Transportation Development Strategy InstituteWuhanChina

The dockless bike-sharing system has rapidly expanded worldwide and has been widely used as an intermodal transport to connect with public ***,higher flexibility may cause an imbalance between supply and demand during daily operation,especially around the metro stations.A stable and efficient rebalancing model requires spatio-temporal usage patterns as fundamental ***,understanding the spatio-temporal patterns and correlates is important for optimizing and rescheduling bike-sharing *** study proposed a dynamic time warping distance-based two-dimensional clustering method to quantify spatio-temporal patterns of dockless shared bikes in Wuhan and further applied the multiclass explainable boosting machine to explore the main related factors of these *** results found six patterns on weekdays and four patterns on *** patterns show the imbalance of arrival and departure flow in the morning and evening peak hours,while these phenomena become less intensive on *** density,living service facility density and residential density are the top influencing factors on both weekdays and weekends,which means that the comprehensive impact of built-up environment attraction,facility suitability and riding demand leads to the different usage *** nonlinear influence universally exists,and the probability of a certain pattern varies in different value ranges of *** the densities of living facilities and roads are moderate and the relationship between job and housing is relatively balanced,it can effectively promote the balanced usage of dockless shared bikes while maintaining high riding *** spatio-temporal patterns can identify the associated problems such as imbalance or lack of users,which could be mitigated by corresponding *** relative importance and nonlinear effects help planners prioritize strategies and identify effective ranges on different patterns to promote the usage a

关键词： Dockless shared bikes spatio-temporal patterns machine learning transit oriented development

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Characteristics,main controlling factors and densification mechanisms of unconventional tight reservoirs in Triassic Yanchang Formation in southern Ordos Basin,China

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Petroleum science 2024年第6期21卷 3884-3898页

作者： Yi-Quan Ma Chen Zhang Yong-Chao Lu Xiang-Ye Kong Ying Guo Yi-Xin Dong Lin Chen Rong Qi Feng-Cun Xing State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation&Institute of Sedimentary Geology Chengdu University of TechnologyChengdu610059SichuanChina Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources Chengdu University of TechnologyChengdu610059SichuanChina College of Earth Resources China University of Geosciences(Wuhan)Wuhan430074HubeiChina College of Management Science Chengdu University of TechnologyChengdu610059SichuanChina Wuhan Center of China Geological Survey Wuhan430205HubeiChina Research Institute of Petroleum Exploration and Development North China Oil and Gas CompanySinopecZhengzhou450006HenanChina

The key factors controlling the densification of unconventional reservoirs(e.g.,tight oil and gas reservoirs)remain poorly understood and directly affect the distribution of exploitable ***,systematically explored reservoir characteristics,depositional microfacies,and the main factors controlling densification of the tight oil reservoir in the Chang 8 Member(Yanchang Formation,Middle Triassic)in the southern Ordos Basin by thin section analysis,scanning electron microscopy,physical property measurement,X-ray diffraction,and mercury *** results confirm the Chang 8 reservoir as an extremely low permeability tight sandstone reservoir mainly comprising lithic feldspathic sandstone with various primary and secondary pores and fine pore *** highest quality reservoir is mainly restricted to the middle and lower parts of subaqueous distributary channel *** partly contributed to reservoir formation,but the persistence of early,non-compressed storage space was more *** compression of plastic rock debris removed a significant amount of porosity,and calcite,kaolinite,and siliceous minerals both fill pores,whereas chlorite cladding of particles protects the pore *** identified three densification mechanisms:the persistent densification of highly plastic rock debris during burial,calcite cementation and pore filling,and feldspar dissolution and subsequent kaolinite precipitation and siliceous *** their compaction,the Chang 8 Member reservoirs were charged with *** applied clustering analysis to eight reservoir characteristics(porosity,permeability,median pore-throat radius,maximum pore-throat radius,median capillary pressure,pore discharge pressure,chlorite content,kaolinite content)to quantitatively classify the Chang 8 reservoir into three ***-Ⅰreservoirs have the best conditions for hosting tight oil reservoirs,with~12%porosity,permeabilities of~0.2×10-3μm2,trial oil producti

关键词： Yanchang formation Tight reservoirs Densification process Ordos basin Reservoir evaluation

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Femtosecond laser direct written fiber Bragg gratings with narrow bandwidth and high sideband suppression

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Chinese Optics Letters 2024年第1期22卷 1-7页

作者：邱文平刘爽程光华湛欢张国栋任冠品孙中瑞张敏 Department of Applied Physics College of Mathematics and PhysicsChengdu University of TechnologyChengdu 610059China School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China Chengdu Development Center of Science and Technology of CAEP Chengdu 610299China

Aiming for suppressing side-mode and spectrum broadening,a slit beam-shaping method and super-Gaussian apodization processing for femtosecond laser point-by-point(PbP)inscription technology of fiber Bragg gratings(FBGs)are reported ***-quality FBGs,featuring narrow bandwidth of less than 0.3 nm,high reflectivity above 85%,low insertion loss(0.21 dB),and low cladding loss(0.82 dB),were obtained *** a semi-automatic PbP inscription process,an array consisting of six FBGs,exhibiting almost no side-mode peaks with high suppression ability and narrow bandwidth,was fabricated along three independently developed single-mode fibers with an interval of 20 mm.

关键词： femtosecond laser processing fiber Bragg grating slit beam shaping

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Self-healing,Stretchable,Temperature-Sensitive and Strain-Sensitive Hydrogel-based Flexible Sensors

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Chinese Journal of Polymer science 2023年第3期41卷 334-344,I0005页

作者： Chun-Xia Zhao Min Guo Jie Mao Yun-Tao Li Yuan-Peng Wu Hua Guo Dong Xiang Hui Li School of Materials Science and Engineering Southwest Petroleum UniversityChengdu 610500China The Center of Functional Materials for Working Fluids of Oil and Gas Field Sichuan Engineering Technology Research Center of Basalt Fiber Composites Development and ApplicationSouthwest Petroleum UniversityChengdu 610500China State Key Lab of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China

Flexible hydrogels have shown promise as strain sensors in medical monitoring,human motion detection and intelligent *** a hydrogel strain sensor,certain challenges need to be urgently addressed for practical applications,such as the damage caused by external effects,leading to equipment failure,and the inability to perceive ambient temperature,resulting in single ***,a stretchable,self-healing and dual temperature-strain sensitive hydrogel,with a physically-crosslinked network,is designed by constructing multiple dynamic reversible *** oxide(GO)and iron ions(Fe^(3+))act as dynamic bridges in the cross-linked network and are mediated by the covalent and hydrogen bonding,rendering excellent stretchability to the *** reversible features of coordination interactions and hydrogen interactions endow excellent recoverability and self-healing ***,the incorporated N-isopropyl acrylamide(NIPAM)provides excellent temperature responsiveness to the hydrogel,facilitating the detection of external temperature ***,the hydrogels exhibited strain-sensitivity,with a wide working range of 1%-300%,fast response and electrical stability,which can be used as flexible sensors to monitor body motions,e.g.,speaking and the bending of finger,wrist,elbow and ***,the hydrogel possesses dual sensory capabilities,combining external temperature and strain,for potential applications in wearable multifunctional sensing devices.

关键词： Hydrogel sensor Self-healing Dual temperature-strain sensitive Monitor body motions

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