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Chip 2024年第2期3卷 62-78页

作者： Huihui Peng Lin gan Xin Guo School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

Inspired by the structure and principles of the human brain,spike neural networks(SNNs)appear as the latest generation of artificial neural networks,attracting significant and universal attention due to their remarkable low-energy transmission by pulse and powerful capability for large-scale parallel *** research on artificial neural networks gradually change from software simulation into hardware ***,such a process is fraught with *** particular,memristors are highly anticipated hardware candidates owing to their fastprogramming speed,low power consumption,and compatibility with the complementary metal–oxide semiconductor(CMOS)*** this review,we start from the basic principles of SNNs,and then introduced memristor-based technologies for hardware implementation of SNNs,and further discuss the feasibility of integrating customized algorithm optimization to promote efficient and energy-saving SNN hardware ***,based on the existing memristor technology,we summarize the current problems and challenges in this field.

关键词： Spike neural networks Hardware Memristor Algorithm Cooperative development

On the improved dynamics approach in loop quantum black holes

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Communications in Theoretical Physics 2024年第3期76卷 138-143页

作者： Hongchao Zhang Wen-Cong gan Yungui Gong Anzhong Wang Institute for Theoretical Physics&Cosmology Zhejiang University of TechnologyHangzhou310023China United Center for Gravitational Wave Physics(UCGWP) Zhejiang University of TechnologyHangzhou310023China College of Physics and Communication Electronics Jiangxi Normal UniversityNanchang 330022China GCAP-CASPER Physics DepartmentBaylor UniversityWacoTX 76798-7316United States of America School of Physics Huazhong University of Science and TechnologyWuhanHubei 430074China Department of Physics School of Physical Science and TechnologyNingbo UniversityNingboZhejiang 315211China

In this paper,we consider the B?hmer–Vandersloot(BV)model of loop quantum black holes obtained from the improved dynamics *** adopt the Saini–Singh gauge,in which it was found analytically that the BV spacetime is geodesically *** show that black/white hole horizons do not exist in this geodesically complete ***,there exists only an infinite number of transition surfaces,which always separate trapped regions from anti-trapped *** on the improved dynamics approach adopted in other models of loop quantum black holes are also given.

关键词： loop quantum gravity black hole dynamics approach

Capturing and visualizing the phase transition mediated thermal stress of thermal barrier coating materials via a cross-scale integrated computational approach

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Journal of Advanced Ceramics 2024年第4期13卷 413-428页

作者： Mengdi gan Tianlong Lu Wei Yu Jing Feng Xiaoyu Chong Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

The generation and evaluation of severely high thermal stress(σ)is known to be responsible for failure of thermal barrier coatings(TBCs)during thermal *** is crucial and challenging to capture fluctuations inσcaused by the phase transition,which has motivated us to develop a high-throughput multiscale evaluation method forσin TBCs that considers the phase transition of the top ceramic materials by coupling first-principles calculations with finite element *** method quantitatively evaluates and visualizesσof the real TBC structure under thermal cycling by multifield ***,the thermophysical properties calculated by the first-principles calculations consider the effects of temperature and phase transition,which not only reduces the cost of obtaining data but also has a more physical *** this work,rare earth tantalites(RETaO_(4))are introduced as ceramic layers,and the results demonstrate thatσundergoes a rapid escalation near the phase transition temperature(T_(t)),particularly in the TBCs_GdTaO_(4) system,where it rises from 224 to 435 *** discontinuity inσmay originate from the significant alterations in Young’s modulus(increase by 27%–78%)and thermal conductivity(increase by 53%–146%)near T_(t).The TBCs_NdTaO_(4) and TBCs_SmTaO_(4) systems exhibit noteworthy temperature drop gradients and minimalσfluctuations,which are beneficial for extending service lifetime of *** approach facilitates the prediction of failure mechanisms and provides theoretical guidance for the reverse design of TBC materials to obtain low thermal stress systems.

关键词： thermal conductivity first-principles calculations thermodynamics thermal stress thermophysical properties

Metabolic cell death in cancer:ferroptosis,cuproptosis,disulfidptosis,and beyond

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Protein & Cell 2024年第9期15卷 642-660页

作者： Chao Mao Min Wang Li Zhuang Boyi gan Department of Experimental Radiation Oncology The University of Texas MD Anderson Cancer CenterHoustonTX 77030USA Department of Molecular and Cellular Biology Baylor College of MedicineHoustonTX 77030USA The University of Texas MD Anderson UTHealth Graduate School of Biomedical Sciences HoustonTX 77030USA

Cell death resistance represents a hallmark of *** studies have identified metabolic cell death as unique forms of regulated cell death resulting from an imbalance in the cellular *** review discusses the mechanisms of metabolic cell death—ferroptosis,cuproptosis,disulfidptosis,lysozincrosis,and alkaliptosis—and explores their potential in cancer *** review underscores the complexity of the metabolic cell death pathways and offers insights into innovative therapeutic avenues for cancer treatment.

关键词： cell death cancer treatment ferroptosis cuproptosis disulfidptosis

Cage-confinement synthesis of MoC nanoclusers as efficient sulfiphilic and lithiophilic regulator for superior Li–S batteries

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Rare Metals 2024年第2期43卷 624-634页

作者： Xing-Yuan Zhang Mei-Na Lei Shan Tian Jian-gan Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an710072China

High-energy-density Li-S batteries are subjected to serious sulfur deactivation and short cycle lifetime caused by undesirable polysulfide shuttle effect and frantic lithium dendrite *** this work,a controllable cage-confinement strategy to fabricate molybdenum carbide(MoC)nanoclusters as a high-efficient sulfiphilic and lithiophilic regulator to mitigate the formidable issues of Li-S batteries is *** sub-2 nm MoC nanoclusters not only guarantee robust chemisorption and fast electrocatalytic conversion of polysulfides to enhance the sulfur electrochemistry,but also homogenize Li^(+) flux to suppress the lithium dendrite *** a consequence,the MoC-modified separator endows the batteries with boosted reaction kinetics,promoted sulfur utilization,and improved cycling stability.A reversible capacity of 701 mAh·g^(−1) at a high rate of 5.0C and a small decay rate of 0.076%per cycle at 1.0C over 600 cycles are *** study offers a rational route for design and synthesis of bifunctional nanoclusers with both sulfiphilicity and lithiophilicity for high-performance Li-S batteries.

关键词： Li-S batteries Nanocluster Electrocatalyst Polysulfide shuttle Li dendrites

基于ARIMA和指数平滑法的直流输电线路地面合成电场实测离群值的判别

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高电压技术 2023年第5期49卷 2161-2170页

作者：谢辉春倪园张建功王延召张业茂干喆渊电网环境保护国家重点实验室(中国电力科学研究院有限公司) 武汉430074

直流输电线路地面合成电场是公众广泛关注的环境影响因子之一。合成电场极易受环境条件影响,实测结果波动较大,往往出现可疑异常值(离群值)。目前合成电场理论模型尚无法全面考虑环境影响,难以准确判别离群值。对此,从时间序列分析的角... 详细信息

直流输电线路地面合成电场是公众广泛关注的环境影响因子之一。合成电场极易受环境条件影响,实测结果波动较大,往往出现可疑异常值(离群值)。目前合成电场理论模型尚无法全面考虑环境影响,难以准确判别离群值。对此,从时间序列分析的角度,提出了基于自回归差分移动平均模型(auto regressive integrated moving average, ARIMA)和指数平滑法(exponential smoothing method, ETS)的离群值判别方法。经算例分析表明,该方法预测的均方根误差(root mean square error, RMSE)仅为1 kV/m左右,能全部判别算例中12处离群值,而经典数理统计方法仅能判别3处离群值。该方法可以有效处理相对平稳、具有固定趋势以及缓慢大幅波动等特征的数据序列,尤其是数据序列中有突然增大的非极端值离群值的情况。该方法比经典数理统计方法更适于判别合成电场实测结果的离群值。

关键词：直流输电线路合成电场时间序列离群值 ARIMA 指数平滑法

Multiscale Fusion Transformer Network for Hyperspectral Image Classification

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Journal of Beijing Institute of Technology 2024年第3期33卷 255-270页

作者： Yuquan gan Hao Zhang Chen Yi School of Telecommunication and Information Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China

Convolutional neural network(CNN)has excellent ability to model locally contextual ***,CNNs face challenges for descripting long-range semantic features,which will lead to relatively low classification accuracy of hyperspectral *** address this problem,this article proposes an algorithm based on multiscale fusion and transformer network for hyperspectral image ***,the low-level spatial-spectral features are extracted by multi-scale residual ***,an attention module is introduced to focus on the more important spatialspectral ***,high-level semantic features are represented and learned by a token learner and an improved transformer *** proposed algorithm is compared with six classical hyperspectral classification algorithms on real hyperspectral *** experimental results show that the proposed algorithm effectively improves the land cover classification accuracy of hyperspectral images.

关键词： hyperspectral image land cover classification multi-scale transformer

Control of gan inverted pyramids growth on c-plane patterned sapphire substrates

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Journal of Semiconductors 2024年第6期45卷 92-96页

作者： Luming Yu Xun Wang Zhibiao Hao Yi Luo Changzheng Sun Bing Xiong Yanjun Han Jian Wang Hongtao Li Lin gan Lai Wang Beijing National Research Center for Information Science and Technology Department of Electronic EngineeringTsinghua UniversityBei-jing 100084China Center for Flexible Electronics Technology Tsinghua UniversityBeijing 100084China

Growth of gallium nitride(gan)inverted pyramids on c-plane sapphire substrates is benefit for fabricating novel devices as it forms the semipolar *** this work,gan inverted pyramids are directly grown on c-plane patterned sapphire substrates(PSS)by metal organic vapor phase epitaxy(MOVPE).The influences of growth conditions on the surface morphol-ogy are experimentally studied and explained by Wulff *** competition of growth rate among{0001},{1011},and{1122}facets results in the various surface morphologies of gan.A higher growth temperature of 985 ℃ and a lowerⅤ/Ⅲratio of 25 can expand the area of{}facets in gan inverted *** the other hand,gan inverted pyramids with almost pure{}facets are obtained by using a lower growth temperature of 930℃,a higherⅤ/Ⅲratio of 100,and PSS with pattern arrangement perpendicular to the substrate primary flat.

关键词： inverted pyramids gan MOVPE crystal growth competition model

Magnetic Interactions with Strain Gradient in Ultrathin Pr_(0.67)Sr_(0.33)MnO_(3) Films

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Engineering 2024年第9期40卷 158-165页

作者： Bangmin Zhang Ping Yang Jun Ding Jingsheng Chen gan Moog Chow Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Singapore Synchrotron Light Source National University of SingaporeSingapore 117603Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

Strain gradient is a normal phenomenon around a heterostructural interface in ultrathin film,and it is important to determine its effect on magnetic interactions to understand interfacial *** this work,ultrathin Pr_(0.67)Sr_(0.33)MnO_(3)(PSMO)films on different substrates are *** PSMO film under different in-plane strain conditions,the saturated magnetization and Curie temperature can be qualitatively explained by double-exchange interaction and the Jahn-Teller ***,the difference in the saturated magnetization with zero field cooling and 5 T field cooling is proportional to the strain ***-gradient-induced structural disorder is proposed to enhance phonon-electron antiferromagnetic interactions and the corresponding antiferromagnetic-to-ferromagnetic phase transition via a strong magnetic field during the field cooling process.A non-monotonous structural transition of the MnO_(6) octahedral rotation can enlarge the strain gradient in PSMO film on a SrTiO_(3) *** work demonstrates the existence of the flexomagnetic effect in ultrathin manganite film,which should be applicable to other complex oxide systems.

关键词： Strain gradient Manganite film Octahedral rotation Flexomagnetic Magnetic interactions Phase transition

Research progress on intelligent operation and maintenance of bridges

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第2期11卷 173-187页

作者： Wanshui Han gan Yang Shizhi Chen Kai Zhou Xin Xu School of Highway Chang'an UniversityXi'an 710064China

In the context of the increasing scale of bridges and the increasing service life of bridges,it is very important to carry out efficient,accurate and intelligent bridge operation and *** recent years,advanced equipment,technology and intelligent algorithms have developed *** is necessary to apply advanced equipment and algorithms to bridge operation and maintenance business to facilitate the digitalization and intelligence of bridge operation and *** grasp the research progress on the bridge intelligent operation and maintenance,this paper summarizes the research progress in recent years from the aspects of intelligent detection equipment and technology,intelligent monitoring equipment and technology,intelligent data analysis,intelligent evaluation and early warning,and intelligent repair and *** to the review,more and more smart devices have been used to replace human beings to detect dangerous and hidden bridge *** the same time,image processing,radar and other technologies have been used to analyze component damage more objectively and *** solve the shortcomings of traditional sensors such as short life and low robustness,more non-contact measurement methods have been *** have proposed various intelligent algorithms to process the massive amount of bridge health monitoring data to improve the quality of the *** achieve the rapid perception of bridge status and timely early warning of structural abnormalities,different from traditional theoretical calculations,scholars have tried to use data-driven methods to intelligently evaluate and early warning of bridge structural *** terms of intelligent repair and maintenance,more intelligent algorithms have been used to optimize structural maintenance strategies and determine the best maintenance time by integrating multisource heterogeneous *** these provide strong support for the automation,digitization and intelligence o

关键词： Bridge engineering Bridge intelligent operation and maintenance Intelligent equipment Technology and algorithms