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Coverage in Cooperative LEO Satellite Networks

Journal of Communications and Information Networks 2023年第4期8卷 329-340页

作者： Bodong Shang Xiangyu Li Caiguo Li Zhuhang Li Eastern Institute for Advanced Study Eastern Institute of TechnologyNingbo 315200China

Low-earth orbit(LEO)satellite networks ignite global wireless ***,signal outages and co-channel interference limit the coverage in traditional LEO satellite networks where a user is served by a single *** paper explores the possibility of satellite cooperation in the downlink *** tools from stochastic geometry,we model and analyze the downlink coverage of a typical user with satellite cooperation under Nakagami fading ***,we derive the joint distance distribution of cooperative LEO satellites to the typical *** model incorporates fading channels,cooperation among several satellites,satellites'density and altitude,and co-channel *** Monte Carlo simulations are performed to validate analytical *** and numerical results suggest that coverage with LEO satellites cooperation considerably exceeds coverage without ***,there are optimal satellite density and satellite altitude that maximize the coverage probability,which gives valuable network design insights.

关键词： Low-earth orbit satellite cooperative communications coverage probability satellite-terrestrial networks non-terrestrial networks

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On Time-Aware Cross-Blockchain Data Migration

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Tsinghua Science and technology 2024年第6期29卷 1810-1820页

作者： Mengqiu Zhang Qiang Qu Li Ning Jianping Fan Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518000China University of Chinese Academy of Sciences Beijing 100000China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518000China

With the widespread adoption of blockchain applications, the imperative for seamless data migration among decentralized applications has intensified. This necessity arises from various factors, including the depletion of blockchain disk space, transitions between blockchain systems, and specific requirements such as temporal data analysis. To meet these challenges and ensure the sustained functionality of applications, it is imperative to conduct time-aware cross-blockchain data migration. This process is designed to facilitate the smooth iteration of decentralized applications and the construction of a temporal index for historical data, all while preserving the integrity of the original data. In various application scenarios, this migration task may encompass the transfer of data between multiple blockchains, involving movements from one chain to another, from one chain to several chains, or from multiple chains to a single chain. However, the success of data migration hinges on the careful consideration of factors such as the reliability of the data source, data consistency, and migration efficiency. This paper introduces a time-aware cross-blockchain data migration approach tailored to accommodate diverse application scenarios, including migration between multiple chains. The proposed solution integrates a collective mechanism for controlling, executing, and storing procedures to address the complexities of data migration, incorporating elements such as transaction classification and matching. Extensive experiments have been conducted to validate the efficacy of the proposed approach.

关键词： blockchain data migration cross-blockchain time-aware multi-chain decentralized applications

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Editorial for the theme issue “Multiscale Crystallites for High Performance Energy Storage”

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Materials Reports(Energy) 2025年第1期5卷 1-2页

作者： Dongfeng Xue Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen518110PR China

In 1959,the talk of Richard ***“There's plenty of room at the bottom”inspired us to explore the very,very small world where a lot of new things would happen that represent completely new designing *** on a small scale behave like nothing on a large scale,for they satisfy the laws of quantum *** we go down and fiddle around with the atoms there,we work with different laws,which enables us to realize different tasks and manufacture in different ways.

关键词： plenty satisfy nothing

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MULTI-STEP ACTOR-CRITIC FRAMEWORK FOR REINFORCEMENT LEARNING IN CONTINUOUS CONTROL

Journal of Applied and Numerical Optimization

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Journal of Applied and Numerical Optimization 2023年第2期5卷 189-200页

作者： Huang, Tianyi Chen, Guangfeng Institute of Advanced Technology Westlake Institute for Advanced Study Hangzhou China School of Engineering Westlake University Hangzhou China

Continuous control is an important issue in control theory. It controls an agent to take action in continuous spaces for transiting from one state to another until achieving the desired goal. A useful tool for this issue is the reinforcement learning where an optimal policy is learned for the agent by maximizing the cumulative reward of the state transitions. However, most existing reinforcement learning methods consider only the one-step transition and one-step reward in each state. In this case, it is hard to recognize the information hidden in the sequence of the previous states and accurately estimate the cumulative reward. Therefore, these methods cannot learn the optimal policy both fast and effectively for continuous control. To solve this problem, in this paper, we propose a new framework, called Multi-step Actor-critic Framework (MAF) for reinforcement learning. In MAF, the convolutional deterministic policy is used to learn the information hidden in the sequence of the previous states by convolutional neural networks, and then n-step temporal difference learning is used to accurately estimate the cumulative reward by considering the rewards from n-step states. Based on an effective reinforcement learning method, TD3, the implementation of our MAF is in nTD3. The theoretical analysis and experiment illustrate that our nTD3 can learn the policy not only better but also faster than the existing RL methods for continuous control. © 2023 Journal of Applied and Numerical Optimization.

关键词： Reinforcement learning

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PVA-regulated construction of 3D rGO-hosted Na_(3)V_(2)(PO_(4))_(2)F_(3) for fast and stable sodium storage

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Journal of Energy Chemistry 2024年第12期99卷 100-109页

作者： Shilong Xu Ying Zhu Xinyan Li Yamei Wang Dong Yan Xiaobin Niu Jingxia Jiang Rui Wu Jun Song Chen School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Medical and Pharmaceutical College Chongqing 401331China Institute for Advanced Study Chengdu UniversityChengdu 610054SichuanChina Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518000GuangdongChin

Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF) is shown to be an attractive cathode material for sodium storage due to its high theoretical capacity and suitable working ***,its low electronic conductivity and poor cycling stability have to be addressed in order for enhanced high-rate performance and cycle ***,we have prepared a 3D reduced graphene oxide (rGO) host-supported NVPF *** discover that polyvinyl alcohol (PVA) serves as an important structural directing agent that bridges between NVPF and rGO through the hydrogen bonding,and thus regulates the formation of the 3D r GO framework with NVPF nanocuboids embedded inside (NVPF@C@rGO).With such a unique construction,NVPF@C@rGO exhibits excellent cycling stability and rate performance for sodium storage,showing high reversible capacities of 121 m Ah/g and 113 mAh/g at 1C and 10C,respectively,and 103 mAh/g after 700cycles at 50C with 98.3%*** at an extremely high current of 100C,it also delivers a reversible capacity of 64 mAh/g,surpassing the performance of many recently reported NVPF-based *** voltammetry (CV) and galvanostatic intermittent titration technique (GITT) data confirm the much better kinetic properties of NVPF@C@rGO electrode than the control samples of NVPF@rGO and pure ***-situ XRD results reveal that the 3D rGO housing can effectively suppress the lattice variation of NVPF,with a maximum volume change of only 1.84%during ***,the in-situ temperature sensing reveals the more stable working temperature of NVPF@C@rGO compared to phase-pure NVPF,suggesting a higher temperature safety of the *** NVPF@C@rGO as the positive electrode and commercial hard carbon as the negative electrode,a sodium-ion full battery has been assembled with about 110 m Ah/g at 1C for 300 cycles,corresponding to an energy density of 291 Wh kg^(-1).The construction of 3D r GO housing as a conductive support offers an effective strategy for high-rate,long cyc

关键词： Sodium-ion battery Polyanionic compound Reduced graphene oxide 3D carbon layers Na_(3)V_(2)(PO_(4))_(2)F_(3)

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Co-dance with Ambiguity: An Ambiguity-Aware Facial Expression Recognition Framework for More Robustness

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IEEE Transactions on Circuits and Systems for Video technology 2025年第6期35卷 5431-5444页

作者： Cao, Xinran Luo, Liang Gu, Yu Ren, Fuji Chengdu611731 China University of Electronic Science and Technology of China Shenzhen Institute for Advanced Study Shenzhen518110 China

Facial Expression Recognition (FER) has received considerable research attention owing to its poor robustness in real-world scenarios. This issue, defined as the uncertainty problem in FER, is often solved by recognizing the noise samples in FER datasets. Unlike noise samples with incorrect labels, ambiguous samples exhibit mixed emotions that align with multiple basic expressions. It makes them indistinguishable in training and harms model robustness. To address this issue, we propose an ambiguity-aware FER framework called Co-dance with Ambiguity (CoA). CoA combines an Emotion Extraction Module (EEM) and an Expression Description Module (EDM) to leverage ambiguity for better performance and robustness. Specifically, EEM employs a coupled-stream structure to extract both representative and detailed features through diverse-scale fusion and patch-attention sensing. EDM adjusts ground-truth labels of ambiguous samples by introducing label pairs derived from the top two highest predictions, describing the mixed-emotion nature. The pairs guide the model to align feature extraction with the inherent ambiguity of ambiguous samples during training. Extensive experiments on five in-the-wild FER datasets demonstrate the superiority of CoA over advanced methods. Moreover, introducing ambiguity-aware strategies enriches feature representations and significantly enhances robustness when faced with a high ratio of ambiguous samples in FER. © 1991-2012 IEEE.

关键词： Face recognition

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An Array-based Photolithographically Patterned Electrochemical Sensing Platform for Highly Sensitive Determination of Uric Acid,Dopamine,L-Tryptophan,and Pyridoxine in Biological Samples

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Journal of Analysis and Testing 2024年第4期8卷 505-517页

作者： Ankit Kumar Singh Shreanshi Agrahari Shivani Shukla Ida Tiwari Muhammad Ahmad S.Ravi P.Silva Department of Chemistry(Centre of Advanced Study) Institute of ScienceBanaras Hindu UniversityVaranasi221005India Advanced Technology Institute University of SurreyGuildfordSurreyGU27XHUK

Biomolecules play important roles in physiological functions and pharmacological characteristics of human *** acid(UA)is the end product of ***(DA)is a neurotransmitter of catecholamine group.L-tryptophan is an essential amino acid that can be metabolized to neuroactive *** is a water-soluble vitamin playing an important role in nervous *** abnormalities in their concentration levels led to a wide range of signifi cant mental and physical ***,electrochemical analysis of these analytes on an array system would be benefi cial from clinical or scientifi c points of *** work was aimed at the development of practical sensor array for determination of multiple analytes on a single sensing platform using individually addressable *** occurrence of adsorption–desorption phenomenon on the surface of palladium microelectrode array(Pd MEA)printed on the silicon wafer through photolithography was exploited for electro-oxidation of UA,DA,L-tryptophan and *** sensing of electroactive UA was done using carbon nanotubes(CNTs)grown Pd MEA as a working electrode,while selectivity for other analytes was achieved by the modifi cation of CNTs/Pd MEA through electrodeposition of poly(L-lysine)(poly(L-lysine)/CNTs/Pd MEA)for DA sensing,poly(L-arginine)(poly(L-arginine)/CNTs/Pd MEA)for L-tryptophan sensing and reduced graphene oxide(rGO/CNTs/Pd MEA)for pyridoxine *** electrochemical diff erential pulse voltammetry(DPV)analyses reveal excellent linearity in the concentration ranges of 50–6000μmol/L,2–8000μmol/L,20–15,000μmol/L,and 10–5000μmol/L with detection limits of 15.0,0.5,10.0,and 1.0μmol/L for UA,DA,L-tryptophan,and pyridoxine,*** proposed multiple analytes sensor has shown very high sensitivities of 140,9580,2280,and 940μA·(μmol·L^(-1))^(-1)·cm^(-2)for UA,DA,L-tryptophan,and pyridoxine sensing,***,accuracy and reliability of the fabricated sensor were also test

关键词： Microelectrode arrays Multianalyte sensor Carbon nanotubes Uric acid Dopamine L-Tryptophan Pyridoxine

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Exploring superionic conduction in lithium oxyhalide solid electrolytes considering composition and structural factors

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npj Computational Materials 2024年第1期10卷 1705-1717页

作者： Fiaz Hussain Jinlong Zhu Yusheng Zhao Wei Xia Ningbo Key Laboratory of All-Solid-State Battery Eastern Institute for Advanced StudyEastern Institute of TechnologyNingboZhejiang315201China Department of Physics Southern University of Science and TechnologyShenzhen518055China

Lithium(Li)oxyhalides have emerged as promising solid electrolyte candidates for all-solid-state batteries(ASSBs)due to their superior ionic conductivity and excellent cathode ***,the mechanism of Li transport in oxyhalides has remained unclear due to the complex nature of these compounds,which often comprise multiple phases such as crystalline and amorphous structures.

关键词： conduction lithium solid

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Application of neutron imaging in observing various states of matter inside lithium batteries

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National Science Review 2023年第11期10卷 192-208页

作者： Lei Gao Songbai Han Haijin Ni Jinlong Zhu Liping Wang Song Gao Yonggang Wang Dubin Huang Yusheng Zhao Ruqiang Zou School of Materials Science and Engineering Peking University Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Department of Physics Southern University of Science and Technology Eastern Institute for Advanced Study

Lithium batteries have been essential technologies and become an integral part of our daily lives, powering a range of devices from phones to electric vehicles. To fully understand and optimize the performance of lithium batteries, it is necessary to investigate their internal states and processes through various characterization methods. Neutron imaging has been an indispensable complementary characterization technique to X-ray imaging or electron microscopy because of the unique interaction principle between neutrons and matter. It provides particular insights into the various states of matter inside lithium batteries,including the Li+concentration in solid electrodes, the Li plating/stripping behavior of Li-metal anodes,the Li+diffusion in solid ionic conductors, the distribution of liquid electrolytes and the generation of *** review aims to highlight the capabilities and advantages of neutron imaging in characterizing lithium batteries, as well as its current state of application in this field. Additionally, we discuss the potential of neutron imaging to contribute to the ongoing development of advanced batteries through its ability to visualize internal evolution.

关键词： lithium battery neutron imaging electrodes electrolytes

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Unveiling the chemistry behind the electrolytic production of hydrogen peroxide by oxygenated carbon

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Journal of Energy Chemistry 2024年第9期96卷 49-58页

作者： Pan Xiang Kunshang Yang Qihao Yang Yang Gao Wenwen Xu Zhiyi Lu Liang Chen Zhiming Wang Ziqi Tian Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201ZhejiangChina Institute for Advanced Study Chengdu UniversityChengdu 610106SichuanChina

Oxygenated carbon materials exhibit outstanding electrocatalytic performance in the production of hydrogen peroxide(H2O2)through a two-electron oxygen reduction *** nature of the active functional group and underlying reaction mechanism,however,remain ***,a comprehensive workflow was established to identify the active sites from the numerous possible *** common hydroxyl group at the notched edge demonstrates a key role in the two-electron *** local chemical environment weakens the binding of OOH intermediate to substrate while enhancing interaction with solution,thereby promoting the H_(2)O_(2)*** increasing pH,the intramolecular hydrogen bond between OOH intermediate and hydroxyl decreases,facilitating OOH ***,the rise in selectivity with increasing potential stems from the suppression of the four-electron *** active site was further validated through *** by theoretical understanding,optimal performance was achieved with high selectivity(>95%)and current density(2.06 mA/cm^(2))in experiment.

关键词： First-principles calculation Oxygen reductionreaction Hydrogen peroxide production Fixed-potential method Oxygenated carbon materials

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