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Atomic Manganese Manipulating Polysulfide Speciation Pathway for Room-Temperature Na-S Batteries

CCS Chemistry 2024年第9期6卷 2289-2304页

作者： Hong Zhang Mingli Wang Xiang-Long Huang songtao lu Ke lu Xiaohong Wu School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbinHeilongjiang 150001 Institutes of Physical Science and Information Technology Anhui UniversityHefeiAnhui 230601 Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054

Sluggish polysulfide redox kinetics,especially the high energy barrier of rate-determining short-chain polysulfide conversion and the high activation barrier of Na_(2)S decomposition during sulfur recovery,compromise the full potential of rechargeable Na-S *** we construct the hierarchical sandwich-structured carbon matrix with atomically dispersed Mn-N4 Lewis acidic sites,taking advantage of their bidirectional electrocatalytic behavior toward interface-mediated reversible sulfur *** and theoretical results reveal that the spatial confinement and catalytic effects facilitated via strong Lewis acid-base electron interactions synergistically manipulate the low kinetically direct Na_(2)S_(4) to Na_(2)S conversion,and the formation of Mn-S bond minimizes the energy barrier of Na_(2)S electrochemical activation during battery recharging,thereby rendering a reversible and tunable polysulfide speciation ***,the degradation of the Na-S cell is due to the depletion of metal anode rather than the loss of active sulfur species and/or aggregation of inactive dead *** expected,the S@Mn/NC cathode delivers outstanding rate capability and ultrahigh cycling ***,a proof-of-concept pouch cell was also demonstrated capable of delivering an energy density up to 840 Wh kgcathode−*** tunable sulfur redox electrochemistry invoked by the bidirectional monodispersed Mn catalytic hot spots facilitates the efficient polysulfide speciation for practical Na-S cells.

关键词： single-atom manganese catalysts polysulfide manipulation reaction kinetics bidirectional catalysts sodium-sulfur batteries

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Design of graph computing accelerator based on reconfigurable PE array

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The Journal of China Universities of Posts and Telecommunications 2024年

作者： Deng Junyong Jia Yanting Zhang Baoxiang Kang Yuchun lu songtao School of Electronic Engineering， Xi’an University of Posts and Telecommunications

Due to the diversity of graph computing applications， the power-law distribution of graph data， and the high memory access-to-computation ratio， traditional architectures face significant challenges in terms of poor flexibility， imbalanced workload distribution， and inefficient memory access when executing graph computing tasks. Graph computing accelerator， GraphApp， based on a reconfigurable processing element (PE) array is proposed to address the aforementioned challenges. GraphApp utilizes 16 reconfigurable PEs for parallel computation and employs tiled data. By reasonably dividing the data into tiles， it achieves load balancing and enhances the overall efficiency of parallel computation. Additionally， it preprocesses graph data using the compressed sparse columns independently (CSCI) data compression format to alleviate the issue of low memory access efficiency caused by the high memory access-to-computation ratio. Lastly， GraphApp is evaluated using triangle counting (TC) and depth-first search (DFS) algorithms. Performance analysis is conducted by measuring the execution time of these algorithms in GraphApp against existing typical graph frameworks， Ligra， and GraphBIG， using six datasets from the stanford network analysis project (SNAP) database. The results show that GraphApp achieves a maximum performance improvement of 30.86% compared to Ligra and 20.43% compared to GraphBIG when processing the same datasets.

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Coordinated adaptive beamformer over distributed antenna network

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Chinese Journal of Aeronautics 2013年第2期26卷 357-362页

作者： Liu Desheng lu songtao Sun Jinping Wang Jun School of Automation Science and Electrical Engineering Beihang University Department of Electrical and Computer Engineering Iowa State University School of Electronic and Information Engineering Beihang University

The spatial diversity of distributed network demands the individual filter to accommodate the topology of interference environment. In this paper, a type of distributed adaptive beamformer is proposed to mitigate interference over coordinated antenna arrays network. The proposed approach is formulated as generalized sidelobe canceller （GSC） structure to facilitate the convex combination of neighboring nodes＇ weights, and then it is solved by unconstrained least mean square （LMS） algorithm due to simplicity. Numerical results show that the robustness and convergence rate of antenna arrays network can be significantly improved in strong interference scenario. And they also clearly illustrate that mixing vector is optimized adaptively and adjusted according to the spatial diversity of the distributed nodes which are placed in different power of received signals to interference ratio （SIR） environments.

关键词： Adaptive algorithm Antenna array Distributed network Energy efficient network Generalized sidelobe canceller Least mean square filter

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Edge-functionalized acetylene black anchoring sulfur for high-performance Li–S batteries

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Journal of Energy Chemistry 2017年第3期26卷 448-453页

作者： Wei Qin songtao lu Zhida Wang Xiaohong Wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

To date, most of the research on electrodes for lithium sulfur batteries has been focused on the nanostructured sulfur cathodes and achieves significant success. However, from the viewpoint of manufacturers, the nanostructured sulfur cathodes are not so promising, because of the low volumetric energy density and high cost. In this work, we obtained the low-cost, scalable, eco-friendly mass production of edge-functionalized acetylene black-sulfur(FAB-S) composites by high-energy ball-milling technique for lithium sulfur batteries. The as-prepared FAB-S composite can deliver a high initial discharge capacity of 1304 mAh/g and still remain a reversible capacity of 814 mAh/g after 200 cycles at a charge-discharge rate of 0.2 C in the voltage range of 1.7–2.7 V. The observed excellent electrochemical properties demonstrate that the cathodes obtained by the facile high-energy ball-milling method as the cathode for rechargeable Li-S batteries are of great potential because it used the sole conductive additive acetylene black(AB).Such improved properties could be attributed to the partially exfoliation of AB, which not only keeps the AB’s inherent advantage, but also increases the specific surface area and forms chemical bonds between carbon and sulfur, resulting in the accumulation of the polysulfides intermediate through both the physical and chemical routes.

关键词： Sulfur cathode Lithium–sulfur batteries Acetylene black Edge-functionalized High-energy ball-milling

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Multiple hypothesis tracking based on the Shiryayev sequential probability ratio test

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Science China Earth Sciences 2016年第12期59卷 86-96页

作者： Jinbin FU Jinping SUN songtao lu Yingjing ZHANG School of Electronic and Information Engineering Beihang University Department of Electrical and Computer Engineering Iowa State University

To date, Wald sequential probability ratio test(WSPRT) has been widely applied to track management of multiple hypothesis tracking(MHT). But in a real situation, if the false alarm spatial density is much larger than the new target spatial density, the original track score will be very close to the deletion threshold of the WSPRT. Consequently, all tracks, including target tracks, may easily be deleted, which means that the tracking performance is sensitive to the tracking environment. Meanwhile, if a target exists for a long time, its track will have a high score, which will make the track survive for a long time even after the target has disappeared. In this paper, to consider the relationship between the hypotheses of the test, we adopt the Shiryayev SPRT(SSPRT) for track management in MHT. By introducing a hypothesis transition probability, the original track score can increase faster, which solves the first problem. In addition, by setting an independent SSPRT for track deletion, the track score can decrease faster, which solves the second problem. The simulation results show that the proposed SSPRT-based MHT can achieve better tracking performance than MHT based on the WSPRT under a high false alarm spatial density.

关键词： multiple target tracking multiple hypothesis tracking Shiryayev sequential probability ratio test track management track score

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Factor graph aided multiple hypothesis tracking

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Science China(Information Sciences) 2013年第10期56卷 284-289页

作者： WANG Huan SUN JinPing lu songtao WEI ShaoMing School of Electronic and Information Engineering Beihang University Department of Electrical and Computer Engineering Iowa State University

Since closely moving targets exist extensively in the ground moving target tracking,the uncertainty of data association greatly increases making the measurement-to-track association more ***,traditional multiple hypothesis tracking(MHT)has high false tracking rate and track *** paper frst investigates the measurement based factor graph in data association,and gives the corresponding message passing ***,a factor graph aided multiple hypothesis tracking(FGA-MHT)method is proposed,which introduces factor graph based m-best hypothesis producing technique and exploits factor graph based probability refnement algorithm to reduce the uncertainty of measurement-to-track *** results demonstrate that FGA-MHT reduces times of track swap and increases the correct data association rate in closely moving target tracking.

关键词： multiple hypothesis tracking(MHT) data association factor graph message passing algorithm sum-product algorithm factor graph aided multiple hypothesis tracking(FGA-MHT

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High rate and cycling stable Li metal anodes enabled with aluminum-zinc oxides modified copper foam

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Journal of Energy Chemistry 2020年第2期29卷 87-92页

作者： songtao lu Zhida Wang He Yan Rui Wang Ke lu Yingwen Cheng Wei Qin Xiaohong Wu MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Department of Chemistry and Biochemistry Northern Illinois UniversityDekalb 60115ILUnited States

Metallic Li is a promising anode material for high energy density batteries but it suffers from poor stability and formation of unsafe dendrites. Previous studies demonstrated that 3 D metal foams are able to improve the stability of Li metal but the properties of these foams are inherently limited. Here we report a facile surface modification approach via magnetron sputtering of mixed oxides that effectively modulate the properties of Cu foams for supporting Li metal with remarkable stability. We discovered that hybrid Li anodes with Li metal thermally infused to aluminum-zinc oxides(AZO) coated Cu foams have significantly improved stability and reactivity compared with pristine Li foils and Li infused to unmodified Cu foams. Full cells assembled with a Li Fe PO4 cathode and a hybrid anode maintained low and stable charge-transfer resistance(lume change without the formation of dendrites during battery cycling. The rational construction of surface architecture to precisely control Li plating and stripping may have great implications for the practical applications of Li metal batteries.

关键词： Composite Lianode Metal foams Surface modification Limetal batteries 3D current collector

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Enhancement of ionic conductivity and fracture toughness by infiltrating porous Li_(0.33)La_(0.56)TiO_(3) pellets

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Journal of Rare Earths 2024年第2期42卷 392-398,I0006页

作者： Xiaojuan lu Mingyang Duan Jingyu Xiang Yuning Liang songtao Liu Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and EngineeringNorth China Electric Power UniversityBaoding071003China

Although solid-state lithium electrolytes have the potential to reduce the safety issues associated with organic liquid electrolytes,disadvantages such as low total conductivity,large interface impedance,and delamination of the interface due to cyclic stress still need to be *** solid-state lithium-ion conductor Li_(0.33)La_(0.56)TiO_(3)(LLTO) was prepared via a hydrothermal route by using CTAB as templates in this *** LLTO with micro-porous channels was obtained and the total conductivity is comparable to the non-porous *** LLTO pellets are infiltrated with the non-porous LLTO precursor solution,and the total conductivities of the infiltrated porous LLTO are all higher than those without *** infiltration,the porous LLTO calcined at 600℃ achieves the highest total conductivity,7.88×10^(-5) S/*** fracture toughness of the infiltrated LLTO is higher than that of the non-porous *** results demonstrate a new way to prepare solid-state lithium-ion conductors with high ionic conductivity and great tolerance to cyclic stress.

关键词： Perovskite Porous material Infiltration Ionic conductors Fracture toughness Rare earths

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大学生学习倦怠对自我效能感的影响:体育锻炼的中介效应

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四川体育科学 2024年第2期43卷 58-61,81页

作者：艾梦琪余蓉晖吕松涛易灵芝桂林电子科技大学广西桂林541004 湖南科技大学湖南湘潭411100 广西师范大学广西桂林541004

为了探讨大学生学习倦怠对自我效能感的影响,并研究体育锻炼的中介效应。选用大学生学习倦怠量表(LBUS)、中文版一般自我效能感量表(GSES)和体育活动等级量表(RARS-3)对778名大学生进行调查分析,结果显示:大学生具有较好的自我效能感,... 详细信息

为了探讨大学生学习倦怠对自我效能感的影响,并研究体育锻炼的中介效应。选用大学生学习倦怠量表(LBUS)、中文版一般自我效能感量表(GSES)和体育活动等级量表(RARS-3)对778名大学生进行调查分析,结果显示:大学生具有较好的自我效能感,但是学习倦怠和体育锻炼情况不佳,在体育锻炼和自我效能两个变量中,男生和女生具有显著性差异,男生的体育锻炼情况和学习倦怠情况优于女生。学习倦怠和体育锻炼、自我效能感显著性负相关,体育锻炼和自我效能感显著正相关。回归结果显示,学习倦怠对自我效能感和体育锻炼的回归效应显著,学习倦怠在体育锻炼的基础上对自我效能感回归效果显著,体育锻炼属于部分中介效应,占总变量的7.00%。SEM模型拟合度适可,验证了体育锻炼在学习倦怠对自我效能感的影响中具有部分中介效应。

关键词：大学生学习倦怠自我效能感体育锻炼中介效应

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一种多星分离的姿控联合仿真方法

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宇航总体技术 2024年第2期8卷 59-65页

作者：姜周卢松涛吕鹏伟吴瀚枭杨海鹏北京宇航系统工程研究所北京100076

现阶段仅依据多体动力学,难以准确分析和评估多星分离时含调姿过程的近远场分离过程。因此针对一箭多星任务的分离安全性设计需求,提出了一种姿控联合仿真方法,实现了近远场分离的实时调姿仿真。计算结果表明,该方法与专业弹道软件相比... 详细信息

现阶段仅依据多体动力学,难以准确分析和评估多星分离时含调姿过程的近远场分离过程。因此针对一箭多星任务的分离安全性设计需求,提出了一种姿控联合仿真方法,实现了近远场分离的实时调姿仿真。计算结果表明,该方法与专业弹道软件相比,计算误差不超过5%。同时为了进一步研究结构参数、动力学参数和调姿算法等变量对分离方案的影响,结合拉丁超立方采样和蒙特卡罗打靶法,优化了采样空间,从而可以快速分析变量偏差、采样方式对不同分离工况的影响,进而准确判定分离方案的安全性。该方法实现了参数的自动化设置,可有效提高仿真效率,能为一箭多星发射任务的快速论证及分离安全性设计需求提供有力支撑。

关键词：多星分离姿控联合仿真近远场分离仿真方法

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