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Anisotropic shearing mechanism of Kangding slate:Experimental investigation and numerical analysis

Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1487-1504页

作者： Ping Liu Quansheng Liu Penghai deng Yucong Pan yiming Lei Chenglei Du Xianqi Xie The Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province School of Civil EngineeringWuhan UniversityWuhan430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

The shear mechanical behavior is regarded as an essential factor affecting the stability of the surrounding rocks in underground engineering.The shear strength and failure mechanisms of layered rock are significantly affected by the foliation angles.Direct shear tests were conducted on cubic slate samples with foliation angles of 0°,30°,45°,60°,and 90°.The effect of foliation angles on failure patterns,acoustic emission(AE)characteristics,and shear strength parameters was analyzed.Based on AE characteristics,the slate failure process could be divided into four stages:quiet period,step-like increasing period,dramatic increasing period,and remission period.A new empirical expression of cohesion for layered rock was proposed,which was compared with linear and sinusoidal cohesion expressions based on the results made by this paper and previous experiments.The comparative analysis demonstrated that the new expression has better prediction ability than other expressions.The proposed empirical equation was used for direct shear simulations with the combined finite-discrete element method(FDEM),and it was found to align well with the experimental results.Considering both computational efficiency and accuracy,it was recommended to use a shear rate of 0.01 m/s for FDEM to carry out direct shear simulations.To balance the relationship between the number of elements and the simulation results in the direct shear simulations,the recommended element size is 1 mm.

关键词： Anisotropy Empirical expression of cohesion foliation angles Combined finite-discrete element method(FDEM) Shear rate Element size

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A Data Intrusion Tolerance Model Based on an Improved Evolutionary Game Theory for the Energy Internet

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Computers, Materials & Continua 2024年第6期79卷 3679-3697页

作者： Song deng yiming Yuan Institute of Advanced Technology Nanjing University of Posts and TelecommunicationsNanjing210003China College of Automation Nanjing University of Posts and TelecommunicationsNanjing210003China

Malicious attacks against data are unavoidable in the interconnected,open and shared Energy Internet(EI),Intrusion tolerant techniques are critical to the data security of EI.Existing intrusion tolerant techniques suffered from problems such as low adaptability,policy lag,and difficulty in determining the degree of tolerance.To address these issues,we propose a novel adaptive intrusion tolerance model based on game theory that enjoys two-fold ideas:(1)it constructs an improved replica of the intrusion tolerance model of the dynamic equation evolution game to induce incentive weights;and (2)it combines a tournament competition model with incentive weights to obtain optimal strategies for each stage of the game process.Extensive experiments are conducted in the IEEE 39-bus system,whose results demonstrate the feasibility of the incentive weights,confirm the proposed strategy strengthens the system’s ability to tolerate aggression,and improves the dynamic adaptability and response efficiency of the aggression-tolerant system in the case of limited resources.

关键词： Energy Internet Intrusion tolerance game theory racial competition adaptive intrusion response

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Balloon Angioplasty for Symptomatic Intracranial Artery Stenosis (BASIS): protocol of a prospective, multicentre, randomised, controlled trial

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Stroke & Vascular Neurology 2024年第1期9卷 66-74页

作者： Xuan Sun Ming Yang Dapeng Sun Guangge Peng yiming deng Xingquan Zhao Liping Liu Ning Ma Feng Gao Dapeng Mo Wengui Yu Yongjun Wang Yilong Wang Zhongrong Miao Department of Interventional Neuroradiology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Department of Neurology Beijing Luhe HospitalCapital Medical UniversityBeijingChina Department of Neurology Comprehensive Stroke&Cerebrovascular CenterUniversity of California IrvineIrvineCaliforniaUSA Chinese Institute for Brain Research BeijingChina National Center for Neurological Diseases BeijingChina Advanced Innovation Center for Human Brain Protection Capital Medical UniversityBeijingChina China National Clinical Research Center for Neurological Diseases BeijingChina Beijing Laboratory of Oral Health Capital Medical UniversityBeijingChina

Background The superiority of balloon angioplasty plus aggressive medical management(AMM)to AMM alone for symptomatic intracranial artery stenosis(sICAS)on efficacy and safety profiles still lacks evidence from randomised controlled trials(RCTs).Aim To demonstrate the design of an RCT on balloon angioplasty plus AMM for sICAS.Design Balloon Angioplasty for Symptomatic Intracranial Artery Stenosis(BASIS)trial is a multicentre,prospective,randomised,open-label,blinded end-point trial to investigate whether balloon angioplasty plus AMM could improve clinical outcome compared with AMM alone in patients with sICAS.Patients eligible in BASIS were 35–80 years old,with a recent transient ischaemic attack within the past 90 days or ischaemic stroke between 14 days and 90 days prior to enrolment due to severe atherosclerotic stenosis(70%–99%)of a major intracranial artery.The eligible patients were randomly assigned to receive balloon angioplasty plus AMM or AMM alone at a 1:1 ratio.Both groups will receive identical AMM,including standard dual antiplatelet therapy for 90 days followed by long-term single antiplatelet therapy,intensive risk factor management and life-style modification.All participants will be followed up for 3years.Study outcomes Stroke or death in the next 30 days after enrolment or after balloon angioplasty procedure of the qualifying lesion during follow-up,or any ischaemic stroke or revascularisation from the qualifying artery after 30 days but before 12 months of enrolment,is the primary outcome.Discussion BASIS trail is the first RCT to compare the efficacy and safety of balloon angioplasty plus AMM to AMM alone in sICAS patients,which may provide an alternative perspective for treating sICAS.Trial registration number NCT03703635;https://www.***.gov.

关键词： balloon prospective centre

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Simulation of liquid cone formation on the tip apex of indium field emission electric propulsion thrusters

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Plasma Science and Technology 2024年第4期26卷 146-155页

作者：孙逸鸣邓涵文刘欣宇康小明 School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Innovation Academy for Microsatellites Chinese Academy of SciencesShanghai 201210People’s Republic of China

Field emission electric propulsion(FEEP) thrusters possess excellent characteristics, such as high specific impulse, low power requirements, compact size and precise pointing capabilities,making them ideal propulsion devices for micro-nano satellites. However, the detection of certain aspects, such as the evolution process of the liquid cone and the physical quantities at the cone apex, proves challenging due to the minute size of the needle tip and the vacuum environment in which they operate. Consequently, this paper introduces a computational fluid dynamics(CFD) model to gain insight into the formation process of the liquid cone on the tip apex of indium FEEP. The CFD model is based on electrohydrodynamic(EHD) equations and the volume of fluid(VOF) method. The entire cone formation process can be divided into three stages, and the time-dependent characteristics of the physical quantities at the cone apex are investigated. The influences of film thickness, apex radius size and applied voltage are compared.The results indicate a gradual increase in the values of electrostatic stress and surface tension stress at the cone apex over an initial period, followed by a rapid escalation within a short duration.Apex configurations featuring a small radius, thick film and high voltage exhibit a propensity for liquid cone formation, and the cone growth time decreases as the film thickness increases.Moreover, some unstable behavior is observed during the cone formation process.

关键词： FEEP needle emitter liquid cone formation CFD simulation

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基于YOLO v5-TL的褐菇采摘视觉识别-测量-定位技术

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农业机械学报 2022年第11期53卷 341-348页

作者：卢伟邹明萱施浩楠王玲 deng yiming 南京农业大学人工智能学院南京210031 密歇根州立大学东兰辛48824

为实现褐菇高效、精准、快速的自动化采摘,针对工厂化褐菇的种植特点,提出一种基于YOLO v5迁移学习(YOLO v5-TL)结合褐菇三维边缘信息直径动态估测法的褐菇原位识别-测量-定位一体化方法。首先,基于YOLO v5-TL算法实现复杂菌丝背景下的... 详细信息

为实现褐菇高效、精准、快速的自动化采摘,针对工厂化褐菇的种植特点,提出一种基于YOLO v5迁移学习(YOLO v5-TL)结合褐菇三维边缘信息直径动态估测法的褐菇原位识别-测量-定位一体化方法。首先,基于YOLO v5-TL算法实现复杂菌丝背景下的褐菇快速识别;再针对锚框区域褐菇图像进行图像增强、去噪、自适应二值化、形态学处理、轮廓拟合进行褐菇边缘定位,并提取边缘点和褐菇中心点的像素坐标;最后基于褐菇三维边缘信息的直径动态估测法实现褐菇尺寸的精确测量和中心点定位。试验结果表明单帧图像平均处理时间为50 ms,光照强度低、中、高情况下采摘对象识别平均成功率为91.67%,其中高光强时识别率达100%,菇盖的尺寸测量平均精度为97.28%。研究表明,本文提出的YOLO v5-TL结合褐菇三维边缘信息直径动态估测法可实现工厂化种植环境下褐菇识别、测量、定位一体化,满足机器人褐菇自动化采摘需求。

关键词：褐菇目标识别定位图像处理尺寸测量 YOLO v5-TL

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褐菇采摘的视觉识别-测量-定位一体化方法

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农业机械学报 2022年

作者：卢伟邹明萱施浩楠王玲 deng yiming 密歇根州立大学南京农业大学人工智能学院

为实现褐菇高效、精准、快速的自动化采摘，针对工厂化褐菇的种植特点，提出一种基于YOLO v5迁移学习(YOLO v5-TL)结合褐菇三维边缘信息直径动态估测法的褐菇原位识别-测量-定位一体化方法。首先，基于YOLO v5-TL算法实现复杂菌丝背景...

为实现褐菇高效、精准、快速的自动化采摘，针对工厂化褐菇的种植特点，提出一种基于YOLO v5迁移学习(YOLO v5-TL)结合褐菇三维边缘信息直径动态估测法的褐菇原位识别-测量-定位一体化方法。首先，基于YOLO v5-TL算法实现复杂菌丝背景下的褐菇快速识别；再针对锚框区域褐菇图像进行图像增强算法、去噪、自适应二值化算法、形态学处理、轮廓拟合算法进行褐菇边缘定位，并提取边缘点和褐菇中心点的像素坐标；最后基于褐菇三维边缘信息的直径动态估测法实现褐菇尺寸的精确测量和中心点定位。实验结果表明单帧图像平均处理时间为50ms，光照强度低、中、高情况下采摘对象识别平均成功率为91.67%，其中高光强时识别率达100%，菇盖的尺寸测量平均精度为97.28%。研究表明，本文提出的YOLO v5-TL结合褐菇三维边缘信息直径动态估测法可实现工厂化种植下褐菇识别、测量、定位一体化，可满足机器人褐菇自动化采摘需求。

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可信执行环境:现状与展望

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计算机研究与发展 2024年第1期61卷 243-260页

作者：张锋巍周雷张一鸣任明德邓韵杰南方科技大学斯发基斯可信自主系统研究院广东深圳518055 南方科技大学计算机科学与工程系广东深圳518055

当前在云服务、移动社交网络下用户普遍追求隐私保护、安全计算,从而推动了隐私计算、机密计算等领域的快速发展.可信执行环境(trusted execution environment,TEE)作为机密计算服务中重要的技术基础已经广泛部署到各类计算平台中.目前,... 详细信息

当前在云服务、移动社交网络下用户普遍追求隐私保护、安全计算,从而推动了隐私计算、机密计算等领域的快速发展.可信执行环境(trusted execution environment,TEE)作为机密计算服务中重要的技术基础已经广泛部署到各类计算平台中.目前,以Intel,Arm等为代表的设备制造商采用软硬件隔离机制,推出了多类实用TEE技术并不断迭代更新,从功能上更加方便设备管理者、普通用户使用安全服务.研究人员则根据不同的系统架构和应用需求,优化TEE模型,扩大可信应用领域并提升其工作效率.全面分析主流系统架构(包括x86、Arm、RISC-V、异构计算单元)中TEE技术发展路线、技术特点包括基础硬件设施设计、软件接口定义、安全边界等,挖掘TEE技术可行的应用场景.同时,分析各类TEE技术面临的挑战,探讨TEE技术局限性以及自身面临的安全风险如侧信道攻击等.在此基础上,从安全性、功能性等方面总结各类TEE技术优缺点,并提出TEE技术未来的发展思路.

关键词：可信执行环境操作系统架构内存隔离处理器模式安全性验证

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大跨距双列圆锥滚子轴承热态特性

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兵工学报 2024年第4期45卷 1285-1296页

作者：王一铭王恒迪崔永存李畅邓四二河南科技大学机电工程学院河南洛阳471003 山东朝阳轴承有限公司山东德州252600

针对摩擦发热会影响轴承寿命的问题,基于滚动轴承动力学理论,建立了考虑滚子修形的重载特种车辆用大跨距双列圆锥滚子轴承动力学分析模型和精细化轴承功耗数学模型,研究结构、工况参数对轴承摩擦功耗的影响规律,并对滚子与套圈的内滚道... 详细信息

针对摩擦发热会影响轴承寿命的问题,基于滚动轴承动力学理论,建立了考虑滚子修形的重载特种车辆用大跨距双列圆锥滚子轴承动力学分析模型和精细化轴承功耗数学模型,研究结构、工况参数对轴承摩擦功耗的影响规律,并对滚子与套圈的内滚道、外滚道和大挡边之间的接触温度特性进行分析。研究结果表明:转速、径向载荷增大以及内滚道倾角减小,滚子与挡边、滚道接触区最大温度均增大,且挡边接触区最大温度增大速率较快。轴向载荷增大会使受压侧受载最大滚子与套圈大挡边、滚道接触区最大温度均增大,套圈大挡边接触区最大温度增大速率较快;放松侧温度也增大,但增大速率较慢;倾覆力矩会导致两列滚动体温度产生差异,选择合适的跨距可以减小倾覆力矩对轴承温度的影响。

关键词：双列圆锥滚子轴承轴承动力学对数修形摩擦功耗热分析

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中国零能耗建筑领域的发展轨迹与前沿趋势——基于CiteSpace知识图谱的定量分析与综合评述

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住宅科技 2024年第5期44卷 6-12页

作者：杨益鸣邓丰同济大学建筑与城市规划学院

文章采用文献计量学分析方法,通过CiteSpace知识图谱对2002—2023年发表的“中国零能耗建筑”相关文献进行筛选和分析,探讨20多年来中国零能耗建筑领域的发展现状、挑战与机遇,以及对未来的展望。研究发现,零能耗建筑的研究自2002年起... 详细信息

文章采用文献计量学分析方法,通过CiteSpace知识图谱对2002—2023年发表的“中国零能耗建筑”相关文献进行筛选和分析,探讨20多年来中国零能耗建筑领域的发展现状、挑战与机遇,以及对未来的展望。研究发现,零能耗建筑的研究自2002年起逐渐增多,尤其在2018年后,随着相关政策的完善和技术标准的制定,研究数量呈现爆发式增长趋势;研究热点主要集中在节能技术与设计、性能评估与优化及建筑材料与构造优化等方面。然而,零能耗建筑的实际应用和推广仍面临挑战,研究领域的集中度较高,缺乏跨学科合作,且在不同地区的执行力度和技术实用性上存在差异。未来研究应更加注重技术创新与应用推广、经济性与政策支持,以及跨学科合作与创新,以促进零能耗建筑的广泛应用和可持续发展。

关键词：零能耗建筑近零能耗建筑知识图谱文献计量法

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Metallogenic model and prognosis of the Shuiyindong super-large strata-bound Carlin-type gold deposit, southwestern Guizhou Province, China

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Chinese Journal Of Geochemistry 2010年第2期29卷 157-166页

作者： ZHANG Yu XIA Yong SU Wenchao TAO Yan ZHANG Xingchun LIU Jianzhong deng yiming State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Geological Party 105 Guizhou Provincial Bureau of Geology and Mineral Exploration ＆ Development Guiyang 550018 China Zijin Mining Stock Company Limited Guizhou Zhenfeng 562200 China

The Shuiyindong deposit is one of the largest (more than 100 tonnes of Au) and highest grade (more than 7×10-6-10×10-6), strata-bound Carlintype gold deposits in southwestern Guizhou Province, China. The deposit is controlled by both structure and favorable lithology. It is situated near the axis of the striking Huijiabao anticline and is hosted in bioclastic limestone of the Permian Longtan Formation. Gold mineralization occurred under low temperature with Th of 220℃± and is closely associated with decarbonation, silicification, sulfidation and dolomitization. The deposit has a characteristic elemental assemblage of Au-As-Hg-Tl. Studies of geochemistry and isotope compositions indicated that the ore-bearing materials and fluids of the gold deposit mainly originated from a plutonic source, and possess a mixing feature with the strata matter during transportation from mantle to crust. Fluid inclusions in vein quartz from the gold deposit are rich in volatile flux, indicating that metallogenic fluid is an overpres-sured one. The activity and geothermal state of the Earth's crust in the long period of time are favorable for the formation of overpressured fluids in a large area, and extensive structures would drive the fluids into ore-forming sys-tem and make gold deposits formed. The complexity of structural movement in the upper crust of southwestern Guizhou Province resulted in complicated gold mineralization. Through metallogenic prognosis and exploration, the proven reserves of the deposit increased by tens of tonnes of Au and the deposit has become a super-large strata-bound Carlin-type gold deposit.

关键词：矿床预测成矿模型卡林型超大型水银洞西南部贵州省层控

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