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Synergetic monitoring of pressure and temperature stimulations in multisensory electronic skin based on time decoupling effect
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作者 Zhiyi Gao Ye Zhang +10 位作者 Zhenyu Hu Dongdong Zhang Shengbin Li Huiyun Xiao Ziyin Xiang Dan Xu Haifeng Zhang Yuanzhao Wu Yiwei Liu Jie Shang Runwei Li 《Carbon Energy》 2025年第1期52-63,共12页
The progress from intelligent interactions requires electronic skin(E-skin)to shift from single-functional perception to multisensory capabilities.However,the intuitive and interference-free reading of multiple sensor... The progress from intelligent interactions requires electronic skin(E-skin)to shift from single-functional perception to multisensory capabilities.However,the intuitive and interference-free reading of multiple sensory signals without involving complex algorithms is a critical challenge.Herein,we propose a flexible multisensory E-skin by developing a highly homogeneous dispersion of BaTiO_(3)nanoparticles in polydimethylsiloxane dielectric layer.The E-skin is sensitive to externally applied pressure as well as temperature and can distinguish dual synergetic stimuli by the time decoupling effect.The pressure and temperature perception was achieved in an individual device,which greatly reduced the structural complexity compared with multifunctional integrated devices.The sensitivity of E-skin for pressure detection is as high as 0.0724 kPa^(−1)and the detection range reaches as wide as 15.625-10 MPa.The sensitivity to temperature detection is as high as−1.34℃^(−1)and the detection range reaches 20-200℃.More importantly,by equipping with a multilayer neural network,the evolution from tactile perception to advanced intelligent tactile cognition is demonstrated. 展开更多
关键词 E-skin intelligent tactile cognition machine learning multifunctional sensing time decoupling effect
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Repetitive control without inductance decoupling for VSR control strategy of DC charging pile
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作者 LIU Peijin SUN Changhe +2 位作者 HE Lin ZHANG Xiangrui FENG Zhengming 《Journal of Measurement Science and Instrumentation》 2025年第1期96-106,共11页
A control strategy of repetitive control without inductorance decoupling was proposed to address the problem of high total harmonic distortion(THD)rate of the network-side current caused by the reduced stability of th... A control strategy of repetitive control without inductorance decoupling was proposed to address the problem of high total harmonic distortion(THD)rate of the network-side current caused by the reduced stability of the rectifier module of the DC charging pile under weak grid as well as the dead zone and nonlinearity of switching devices during charging.Firstly,the parallel repetitive control was constructed in the inner current loop,and the proportional-integral(PI)+repetitive controller based on parallel structure was designed.For system compensation,a second-order low-pass filter was selected to correct the system,and the network-side current harmonics were actively suppressed without increasing the filtering device,which effectively improves the quality of grid-connected current.Secondly,based on the synthetic vector method,the controller parameters were designed to realize the elimination of main pole by establishing two synchronous rotation coordinate system vector differential equations,so as to realize the inductanceless decoupling to cope with the influence of network-side inductance fluctuation on the stability of the control system under weak grid.By theoretical analysis and simulation,the proposed control strategy was embedded into the self-developed digital signal processor for the rectifier module of DC charging pile,simulated dynamic and steady-state operation experiments were conducted,and comparative analysis was performed to prove the feasibility of the proposed control strategy. 展开更多
关键词 weak grid DC charging pile voltage source rectifier(VSR) repetitive control inductanceless decoupling
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Preventing Hardware Trojans in Switch Chip Based on Payload Decoupling 被引量:1
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作者 Ke Song Binghao Yan +2 位作者 Xiangyu Li Qinrang Liu Ling OuYang 《China Communications》 SCIE CSCD 2021年第8期96-108,共13页
Hardware Trojans in integrated circuit chips have the characteristics of being covert,destructive,and difficult to protect,which have seriously endangered the security of the chips themselves and the information syste... Hardware Trojans in integrated circuit chips have the characteristics of being covert,destructive,and difficult to protect,which have seriously endangered the security of the chips themselves and the information systems to which they belong.Existing solutions generally rely on passive detection techniques.In this paper,a hardware Trojans active defense mechanism is designed for network switching chips based on the principle of encryption algorithm.By encoding the data entering the chip,the argot hidden in the data cannot trigger the hardware Trojans that may exist in the chip,so that the chip can work normally even if it is implanted with a hardware Trojans.The proposed method is proved to be effective in preventing hardware Trojans with different trigger characteristics by simulation tests and practical tests on our secure switching chip. 展开更多
关键词 network switching chip active defense hardware trojan payload decoupling
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Adjustment mechanism of blasting dynamic-static action in the water decoupling charge
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作者 Hao Zhang Xueyang Xing +3 位作者 Yiteng Du Tingchun Li Jianxin Yu Qingwen Zhu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第6期821-836,共16页
Water decoupling charge blasting excels in rock breaking,relying on its uniform pressure transmission and low energy dissipation.The water decoupling coefficients can adjust the contributions of the stress wave and qu... Water decoupling charge blasting excels in rock breaking,relying on its uniform pressure transmission and low energy dissipation.The water decoupling coefficients can adjust the contributions of the stress wave and quasi-static pressure.However,the quantitative relationship between the two contributions is unclear,and it is difficult to provide reasonable theoretical support for the design of water decoupling blasting.In this study,a theoretical model of blasting fracturing partitioning is established.The mechanical mechanism and determination method of the optimal decoupling coefficient are obtained.The reliability is verified through model experiments and a field test.The results show that with the increasing of decoupling coefficient,the rock breaking ability of blasting dynamic action decreases,while quasi-static action increases and then decreases.The ability of quasi-static action to wedge into cracks changes due to the spatial adjustment of the blast hole and crushed zone.The quasi-static action plays a leading role in the fracturing range,determining an optimal decoupling coefficient.The optimal water decoupling coefficient is not a fixed value,which can be obtained by the proposed theoretical model.Compared with the theoretical results,the maximum error in the model experiment results is 8.03%,and the error in the field test result is 3.04%. 展开更多
关键词 Water decoupling blasting Blasting dynamic-static action Optimal decoupling coefficient Adjustment mechanism
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Recent advances and future prospects in tactile sensors for normal and shear force detection,decoupling,and applications
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作者 Jinrong Huang Yuchen Guo +3 位作者 Yongchang Jiang Feiyu Wang Lijia Pan Yi Shi 《Journal of Semiconductors》 EI CAS CSCD 2024年第12期17-31,共15页
Human skin,through its complex mechanoreceptor system,possesses the exceptional ability to finely perceive and dif-ferentiate multimodal mechanical stimuli,forming the biological foundation for dexterous manipulation,... Human skin,through its complex mechanoreceptor system,possesses the exceptional ability to finely perceive and dif-ferentiate multimodal mechanical stimuli,forming the biological foundation for dexterous manipulation,environmental explo-ration,and tactile perception.Tactile sensors that emulate this sensory capability,particularly in the detection,decoupling,and application of normal and shear forces,have made significant strides in recent years.This review comprehensively examines the latest research advancements in tactile sensors for normal and shear force sensing,delving into the design and decoupling methods of multi-unit structures,multilayer encapsulation structures,and bionic structures.It analyzes the advantages and disadvantages of various sensing principles,including piezoresistive,capacitive,and self-powered mechanisms,and evalu-ates their application potential in health monitoring,robotics,wearable devices,smart prosthetics,and human-machine interaction.By systematically summarizing current research progress and technical challenges,this review aims to provide forward-looking insights into future research directions,driving the development of electronic skin technology to ultimately achieve tactile perception capabilities comparable to human skin. 展开更多
关键词 tactile sensors shear force force decoupling e-skin
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Enhanced measurement precision with continuous interrogation during dynamical decoupling
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作者 张军 杜鹏 +3 位作者 敬雷 徐鹏 尤力 张文献 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第3期88-94,共7页
Dynamical decoupling(DD)is normally ineffective when applied to DC measurement.In its straightforward implementation,DD nulls out DC signal as well while suppressing noise.This work proposes a phase relay method that ... Dynamical decoupling(DD)is normally ineffective when applied to DC measurement.In its straightforward implementation,DD nulls out DC signal as well while suppressing noise.This work proposes a phase relay method that is capable of continuously interrogating the DC signal over many DD cycles.We illustrate its efficacy when applied to the measurement of a weak DC magnetic field with an atomic spinor Bose-Einstein condensate.Sensitivities approaching standard quantum limit or Heisenberg limit are potentially realizable for a coherent spin state or a squeezed spin state of 10000 atoms,respectively,while ambient laboratory level noise is suppressed by DD.Our work offers a practical approach to mitigate the limitations of DD to DC measurement and would find other applications for resorting coherence in quantum sensing and quantum information processing research. 展开更多
关键词 quantum sensing continuous interrogation quantum magnetometer dynamical decoupling Heisenberg limit
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IMTNet:Improved Multi-Task Copy-Move Forgery Detection Network with Feature Decoupling and Multi-Feature Pyramid
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作者 Huan Wang Hong Wang +2 位作者 Zhongyuan Jiang Qing Qian Yong Long 《Computers, Materials & Continua》 SCIE EI 2024年第9期4603-4620,共18页
Copy-Move Forgery Detection(CMFD)is a technique that is designed to identify image tampering and locate suspicious areas.However,the practicality of the CMFD is impeded by the scarcity of datasets,inadequate quality a... Copy-Move Forgery Detection(CMFD)is a technique that is designed to identify image tampering and locate suspicious areas.However,the practicality of the CMFD is impeded by the scarcity of datasets,inadequate quality and quantity,and a narrow range of applicable tasks.These limitations significantly restrict the capacity and applicability of CMFD.To overcome the limitations of existing methods,a novel solution called IMTNet is proposed for CMFD by employing a feature decoupling approach.Firstly,this study formulates the objective task and network relationship as an optimization problem using transfer learning.Furthermore,it thoroughly discusses and analyzes the relationship between CMFD and deep network architecture by employing ResNet-50 during the optimization solving phase.Secondly,a quantitative comparison between fine-tuning and feature decoupling is conducted to evaluate the degree of similarity between the image classification and CMFD domains by the enhanced ResNet-50.Finally,suspicious regions are localized using a feature pyramid network with bottom-up path augmentation.Experimental results demonstrate that IMTNet achieves faster convergence,shorter training times,and favorable generalization performance compared to existingmethods.Moreover,it is shown that IMTNet significantly outperforms fine-tuning based approaches in terms of accuracy and F_(1). 展开更多
关键词 Image copy-move detection feature decoupling multi-scale feature pyramids passive forensics
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How can technology and efficiency alleviate the dilemma of economic growth and carbon emissions in China's industrial economy? A metafrontier decoupling decomposition analysis
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作者 Miao Wang Chao Feng 《Petroleum Science》 SCIE EI CAS CSCD 2024年第2期1415-1428,共14页
This paper attempts to explore the decoupling relationship and its drivers between industrial economic increase and energy-related CO_(2) emissions(ICE). Firstly, the decoupling relationship was evaluated by Tapio ind... This paper attempts to explore the decoupling relationship and its drivers between industrial economic increase and energy-related CO_(2) emissions(ICE). Firstly, the decoupling relationship was evaluated by Tapio index. Then, based on the DEA meta-frontier theory framework which taking into account the regional and industrial heterogeneity and index decomposition method, the driving factors of decoupling process were explored mainly from the view of technology and efficiency. The results show that during2000-2019, weak decoupling was the primary state. Investment scale expansion was the largest reason hindering decoupling process of industrial increase from ICE. Both energy saving and production technology achieved significant progress, which facilitated the decoupling process. Simultaneously, the energy technology gap and production technology gap among regions have been narrowed, and played a role in promoting decoupling process. On the contrary, both scale economy efficiency and pure technical efficiency have inhibiting effects on decoupling process. The former indicates that the scale economy of China's industry was not conducive to improve energy efficiency and production efficiency, while the latter indicates that resource misallocation problem may exist in both energy market and product market. 展开更多
关键词 China's industrial sector decoupling process Meta-frontier DEA Index decomposition method Driving factors
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Decoupling Algorithms for the Gravitational Wave Spacecraft
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作者 XueWang Weizhou Zhu +4 位作者 Zhao Cui Xingguang Qian Jinke Yang Jianjun Jia Yikun Wang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第7期325-337,共13页
The gravitational wave spacecraft is a complex multi-input multi-output dynamic system.The gravitational wave detection mission requires the spacecraft to achieve single spacecraft with two laser links and high-precis... The gravitational wave spacecraft is a complex multi-input multi-output dynamic system.The gravitational wave detection mission requires the spacecraft to achieve single spacecraft with two laser links and high-precision control.Establishing one spacecraftwith two laser links,compared to one spacecraft with a single laser link,requires an upgraded decoupling algorithmfor the link establishment.The decoupling algorithmwe designed reassigns the degrees of freedomand forces in the control loop to ensure sufficient degrees of freedomfor optical axis control.In addressing the distinct dynamic characteristics of different degrees of freedom,a transfer function compensation method is used in the decoupling process to further minimize motion coupling.The open-loop frequency response of the systemis obtained through simulation.The upgraded decoupling algorithms effectively reduce the open-loop frequency response by 30 dB.The transfer function compensation method efficiently suppresses the coupling of low-frequency noise. 展开更多
关键词 Gravitational waves spacecraft laser acquisition decoupling algorithms dynamical model optical axis control
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Decomposition and decoupling effect of energy eco-footprint based on global net primary productivity in urban agglomerations
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作者 HU Mian-hao YUAN Ju-hong 《Ecological Economy》 2024年第4期302-318,共17页
Net primary productivity(NPP)is an important breakthrough point of current research on ecological footprint improvement.The energy eco-footprint(EEF)of the Four-City Area in Central China(FCACC)was measured by constru... Net primary productivity(NPP)is an important breakthrough point of current research on ecological footprint improvement.The energy eco-footprint(EEF)of the Four-City Area in Central China(FCACC)was measured by constructing an EEF-NPP model.This work has made the following efforts:(1)Gini coefficient was employed to analyze the degree of matching between the EEF and economic growth,population,and energy consumption.(2)LMDI decomposition method was used to explore the impacts of multiple factors on the EEF in the FCACC.(3)Tapio decoupling model was applied to verify the decoupling relationships between the above influencing factors and the EEF.(4)LMDI decomposition formula was embedded into the decoupling model to analyze the impacts of technical and non-technical factors on the decoupling elasticity of the above.The main findings show that from 2010 to 2020:(1)the degree of matching of EEF-GDP,EEF-population,and EEF-energy consumption increased.(2)energy intensity and per capita GDP were the main factors that affected the EEF.(3)the decoupling states between total energy consumption,energy consumption structure,energy intensity,per capita GDP,and population size with the EEF were expansive negative decoupling,expansive negative decoupling,strong negative decoupling,weak decoupling,and expansive negative decoupling,respectively.(4)the impact of non-technical factors was greater than that of technical factors,and their impacts were always in opposite directions. 展开更多
关键词 logarithmic mean divisia index(LMDI)decomposition decoupling analysis energy eco-footprint global net primary productivity
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Research on Active and Reactive Power Decoupling Control Based on VSC-HVDC
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作者 Hongshan Lin Yiming Lei Feng Ning 《Journal of Electronic Research and Application》 2024年第4期48-54,共7页
Voltage Source Converter-based High Voltage Direct Current(VSC-HVDC)transmission technology represents a groundbreaking approach in high voltage Direct Current(DC)transmission,offering numerous technical advantages an... Voltage Source Converter-based High Voltage Direct Current(VSC-HVDC)transmission technology represents a groundbreaking approach in high voltage Direct Current(DC)transmission,offering numerous technical advantages and broad application prospects.However,in the d-q synchronous rotating coordinate system,the VSC-HVDC exhibits the coupling effect of active power and reactive power,so it needs to be decoupled.This paper introduces the basic principle and mathematical model of the VSC-HVDC transmission system.Through the combination of coordinate transformation and variable substitution,a feedforward decoupling control method is derived.Then the VSC-HVDC simulation model is designed,and the simulation analysis is carried out in the MATLAB environment.The simulation results demonstrate that the method effectively achieves decoupling control of active and reactive power,exhibiting superior dynamic performance and robustness.These findings validate the correctness and effectiveness of the control strategy. 展开更多
关键词 Voltage source converter decoupling control Feedforward decoupling
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任务自适应增强的人机特征解耦可分级压缩 被引量:1
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作者 安平 沙莉娅 +2 位作者 吴颖 杨超 黄新彭 《信号处理》 北大核心 2025年第2期399-408,共10页
图像压缩作为一项关键技术,旨在传输过程中保留尽可能少的关键信息,同时使得压缩后的图像保持较好的质量。而随着计算机视觉的发展,图像的主要消费者不仅仅是人类而更多的是机器,因此探索一种能够同时面向人类视觉和机器视觉的图像压缩... 图像压缩作为一项关键技术,旨在传输过程中保留尽可能少的关键信息,同时使得压缩后的图像保持较好的质量。而随着计算机视觉的发展,图像的主要消费者不仅仅是人类而更多的是机器,因此探索一种能够同时面向人类视觉和机器视觉的图像压缩方法十分具有意义。然而,现有的基于学习的图像编码技术虽然已经在人眼感知质量上取得了显著性的进步,但由于信号保真度及语义保真度的方法在驱动目标上存在分歧,无法同时满足机器视觉和人眼的需求。因此,本文提出了任务自适应增强的特征解耦可分级压缩方法,旨在利用单一比特流来支持多种视觉任务,并根据需求进行图像的选择性重建或完全重建。具体而言,本方法将图像特征解耦为目标特征和背景特征分别进行压缩和重建,所得到的目标图像用于后续目标检测和语义分割任务,而高质量完整重建的图像供人眼观看。这样不仅在实现视觉任务时避免了重建完整图像,提高压缩效率,还能够满足人眼的不同需求。此外,为了解决因目标区域重要性差异而引起的任务性能不平衡问题,本方法还设计了可插拔的任务自适应单元,并将其嵌入在目标特征解码器中,从而可以根据具体任务需求调整特征以增强重建目标图像的分析性能,而无须重新训练整个网络。实验结果证明,该方法与其他编解码器相比,展现出了更优的任务性能和速率失真(RateDistortion)性能。 展开更多
关键词 图像压缩 人机协同 特征解耦 任务自适应增强
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我国碳排放驱动因素分解及脱钩努力效应研究
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作者 郭文强 于忠萍 +2 位作者 雷明 张雯苹 高雅琪 《环境科学研究》 北大核心 2025年第2期209-219,共11页
准确把握我国整体碳排放发展现状,分析碳排放的驱动因素并探究碳排放脱钩的内在机制演变,对我国节能减排政策的制定具有重要的指导意义。本研究运用GDIM分解模型对我国2000-2022年的整体碳排放进行因素分解,并在此基础上,结合Tapio脱钩... 准确把握我国整体碳排放发展现状,分析碳排放的驱动因素并探究碳排放脱钩的内在机制演变,对我国节能减排政策的制定具有重要的指导意义。本研究运用GDIM分解模型对我国2000-2022年的整体碳排放进行因素分解,并在此基础上,结合Tapio脱钩模型构建脱钩努力模型,测度各驱动因素的脱钩努力效应,以评估我国减排政策的有效性。结果表明:①2000-2022年,我国整体碳排放总量逐年上升,由30.03×10^(8)t增至105.77×10^(8)t,累计增加了75.74×10^(8)t,碳减排工作面临较大挑战;空间上,碳排放分布不均,呈现出东多西少、北多南少的特征,且东西差距逐渐缩小。②技术规模是碳排放增加的最大驱动力,同时经济规模、能源规模及人均碳排放因素也有明显贡献,而技术碳强度是降碳的关键因素,其次是经济碳强度、能源消费碳强度。③2012年起,经济增长与碳排放脱钩指数始终保持在-0.3~0.8的范围,以弱脱钩状态为主。④经济碳强度、技术碳强度、能源碳强度及能源强度均可促进碳排放脱钩,其中,尤其显著的是技术碳强度,其脱钩努力指数大于1的频率高达63.64%。但是,在大多数年份下总脱钩努力指数仍为负值,表明总体脱钩努力尚不足以抵消经济效应带来的碳排放增长。因此,为加强我国碳排放治理及脱钩努力效应,应重点关注碳排放控制、绿色低碳技术创新以及碳减排政策的完善与落实。 展开更多
关键词 碳排放 因素分解 GDIM Tapio脱钩模型 脱钩努力模型
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中空连续体机械臂的设计与主从任务转换避障控制
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作者 万淑敏 孙长超 +2 位作者 袁培康 常乐 康荣杰 《天津大学学报(自然科学与工程技术版)》 EI CAS 北大核心 2025年第1期24-35,共12页
连续体机械臂具有优良的弯曲性能和柔顺灵活性,表现出了独特的环境适应性和人机交互安全性,在微创手术、灾后救援、狭窄空间检修等非结构化环境及家庭服务领域具有广阔的应用前景.然而,连续体机械臂的中央脊椎骨占据其内部空间,模块单... 连续体机械臂具有优良的弯曲性能和柔顺灵活性,表现出了独特的环境适应性和人机交互安全性,在微创手术、灾后救援、狭窄空间检修等非结构化环境及家庭服务领域具有广阔的应用前景.然而,连续体机械臂的中央脊椎骨占据其内部空间,模块单元冗余且运动耦合导致避障运动困难等问题妨碍了其在实际场景中的应用.针对以上问题,设计了内部中空的丝驱动连续体机械臂,为末端执行器的电液气管线留置出了充足的物理空间,并通过鲍登管在结构上实现了模块单元间的运动解耦;考虑丝驱动连续体机械臂的弯曲特性,建立了解耦后的简化运动学模型和运动学闭环控制算法;构造了评估空间障碍物与连续体机械臂最短距离的计算方法;在传统变构型避障运动控制的基础上,提出了基于主从任务转换的避障控制算法,能够在末端轨迹跟踪约束下,实现对障碍的躲避,同时也可暂时舍弃对给定末端轨迹的跟踪以躲避位于末端运动轨迹附近的障碍物.仿真和实验结果表明:所设计的连续体机械臂具有良好的运动能力,轨迹跟踪控制的末端位置平均误差为2.510 mm,仅为连续体机械臂长度的0.32%;提出的主从任务转换避障控制算法有效,能够准确评估末端运动与避障运动的优先级,相关研究工作为连续体机械臂的设计和运动控制提供了新的参考和思路. 展开更多
关键词 连续体机械臂 解耦 避障 主从任务转换
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基于跨模态特征重构与解耦网络的多模态抑郁症检测方法
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作者 赵小明 谌自强 张石清 《计算机应用研究》 北大核心 2025年第1期236-241,共6页
抑郁症是一种广泛而严重的心理健康障碍,需要早期检测以便进行有效的干预。因为跨模态之间存在的信息冗余和模态间的异质性,集成音频和文本模态的自动化抑郁症检测是一个具有挑战性但重要的问题,先前的研究通常未能充分地明确学习音频-... 抑郁症是一种广泛而严重的心理健康障碍,需要早期检测以便进行有效的干预。因为跨模态之间存在的信息冗余和模态间的异质性,集成音频和文本模态的自动化抑郁症检测是一个具有挑战性但重要的问题,先前的研究通常未能充分地明确学习音频-文本模态的相互作用以用于抑郁症检测。为了解决这些问题,提出了基于跨模态特征重构与解耦网络的多模态抑郁症检测方法(CFRDN)。该方法以文本作为核心模态,引导模型重构音频特征用于跨模态特征解耦任务。该框架旨在从文本引导重构的音频特征中解离共享和私有特征,以供后续的多模态融合使用。在DAIC-WoZ和E-DAIC数据集上进行了充分的实验,结果显示所提方法在多模态抑郁症检测任务上优于现有技术。 展开更多
关键词 多模态 抑郁症检测 特征重构 特征解耦 特征融合
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我国省际碳排放脱钩的动态演变及收敛性分析
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作者 郭文强 于忠萍 +2 位作者 雷明 史瑞雪 韦星羽 《地域研究与开发》 北大核心 2025年第1期166-172,180,共8页
运用Tapio脱钩指数、空间自相关与空间马尔科夫链模型,探讨2001—2022年我国省际碳排放脱钩的时空动态演化特征,并根据收敛模型进行俱乐部划分分析从而揭示我国省际脱钩关系的演变以寻求低碳发展路径。结果表明:(1) 2001—2022年我国各... 运用Tapio脱钩指数、空间自相关与空间马尔科夫链模型,探讨2001—2022年我国省际碳排放脱钩的时空动态演化特征,并根据收敛模型进行俱乐部划分分析从而揭示我国省际脱钩关系的演变以寻求低碳发展路径。结果表明:(1) 2001—2022年我国各省份的脱钩类型由多样化共存逐步发展到以弱脱钩为主导,整体发展形势向好。(2)碳排放脱钩的全局空间正自相关性显著,局部空间发展以L-L聚集为主,东西空间分异愈发显著,出现极化效应。(3)较少出现跨越性的脱钩转移,且转移概率受邻域脱钩状态影响存在差异。理想脱钩省份可产生正向空间溢出效应,有助于发挥低碳锁定作用,而脱钩不理想省份则会发挥负向溢出效应。(4)我国整体脱钩水平尚未达到同一稳态,局部检验共得到6个收敛俱乐部,内部表现出较显著的趋同效应。 展开更多
关键词 脱钩 Tapio 空间自相关 空间马尔科夫链 俱乐部
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基于一般性动力学建模的多电机复合同步控制
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作者 谢斌 雷力 +1 位作者 王在相 李叶松 《中国电机工程学报》 北大核心 2025年第7期2821-2831,I0033,共12页
多电机同步系统广泛应用于精密制造领域,但是多样化系统结构与差异化同步控制需求,为高通用性同步控制策略设计带来了困难。为克服这些问题,该文建立多电机同步系统的一般性动力学模型,以统一形式的数学模型描述多样化同步控制问题;通... 多电机同步系统广泛应用于精密制造领域,但是多样化系统结构与差异化同步控制需求,为高通用性同步控制策略设计带来了困难。为克服这些问题,该文建立多电机同步系统的一般性动力学模型,以统一形式的数学模型描述多样化同步控制问题;通过基于运动学的坐标变换,揭示动力学模型内部复杂耦合关系及在耦合效应影响下的同步误差形成机理;通过提出运动解耦设计方法,精确补偿驱动轴与同步轴之间动力学特性差异,并实现系统解耦;基于已解耦系统设计反馈形式的运动跟踪控制器提升系统实时同步性能。仿真与实验结果表明,依据一般性动力学建模分析提出的复合同步控制策略具有明确的可解释性,能够有效提高多电机同步控制性能。 展开更多
关键词 多电机同步 动力学建模 耦合系统 同步控制 解耦控制
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工程爆破扩腔能耗随不耦合系数的变化规律
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作者 黄永辉 秦丽绚 +1 位作者 徐锐 张智宇 《兵工学报》 北大核心 2025年第3期234-242,共9页
为了优化地下工程周边孔光面爆破中的炸药能量分布情况,提高孔痕率,保证光面爆破效果,采用爆破破岩及断裂力学理论,构建扩腔能耗计算方法,通过浇筑素混凝土模型进行爆破试验,得到扩腔尺寸、体积和能耗随不耦合系数K的变化规律。研究结... 为了优化地下工程周边孔光面爆破中的炸药能量分布情况,提高孔痕率,保证光面爆破效果,采用爆破破岩及断裂力学理论,构建扩腔能耗计算方法,通过浇筑素混凝土模型进行爆破试验,得到扩腔尺寸、体积和能耗随不耦合系数K的变化规律。研究结果表明:在K由1.25增大到3.375的过程中,扩腔直径平均为3.43 cm,扩腔长度平均为12.7 cm,扩腔体积介于52.98~155.56 cm 3,扩腔能耗介于0.58~1.70 kJ,其在炸药总能量中的占比介于2.9%~8.5%;随着K的增大,扩腔体积和能耗呈减小趋势,K在达到3.0~3.5时对减小扩腔能耗效果最为明显,而后趋于平稳;K增大会减轻炸药能量对炮孔壁岩石的粉碎程度,使扩腔体积减小,同时扩腔能耗降低;模型试验结果与理论分析相互验证,表明在一定范围内选取较大的不耦合系数可以减小扩腔能耗。 展开更多
关键词 工程爆破 扩腔 能耗 不耦合系数 模型试验
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时空语义驱动的渐进多视角行为去偏置研究
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作者 钟忺 陈亮 +4 位作者 刘文璇 叶舒 江奎 王正 林嘉文 《计算机工程》 北大核心 2025年第1期1-10,共10页
在实际应用中,单视角摄像头采集数据由于物体存在遮挡而失去对某些区域的可见性,因此结合多个视角下的数据进行行为分析对于维护社会稳定及民生安全至关重要。针对多视角行为识别中存在的偏置问题,即不同视角下空间语义不一致导致的视... 在实际应用中,单视角摄像头采集数据由于物体存在遮挡而失去对某些区域的可见性,因此结合多个视角下的数据进行行为分析对于维护社会稳定及民生安全至关重要。针对多视角行为识别中存在的偏置问题,即不同视角下空间语义不一致导致的视角间行为表征差异以及同一行为执行过程中的时序语义不一致导致的行为表征差异,提出一种渐进去偏置的多视角方法。首先,在多视角下的同一行为样本中以证据理论为引导,结合不同视角下的行为同构性进行视角间行为去偏置,优化不同视角下关注的行为特征权重,以获得更全面的无偏行为表示。其次,结合多粒度解耦策略,分析不同粒度对行为特征无偏表达的影响,准确分离行为相关和行为无关特征,以避免视角内行为无关信息扰乱行为表征导致的显著差异。最后,在时序维度上构建不同行为特征权重,增强同一视角内行为特征一致性,减弱同一行为的行为表征差异。在多个数据集上的实验结果验证了所提方法的有效性,在N-UCLA和NTU-RGB+D数据集上的跨视角准确率分别达到了97.4%和96.4%,并且所提方法在满足多视角下对行为识别进行准确分析应用需求的同时通过一种新的去偏置思路为多视角行为识别问题提供了一种有效的解决方案。 展开更多
关键词 多视角行为识别 渐进式去偏置 证据理论 解耦 多粒度
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基于前馈补偿的轮腿式平台多任务复合运动解耦控制
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作者 刘辉 马嘉勇 +1 位作者 杨海洋 郝伟赫 《北京理工大学学报》 EI CAS 北大核心 2025年第1期26-33,共8页
轮腿式平台在执行复杂作战环境载运任务时,由于其动态协调腿部与车轮运动是复杂耦合的,其行驶速度的稳定性、位姿控制的精确性都十分困难.文中基于轮腿式平台通过有限高度场景的动态协调任务,提出了一种基于前馈补偿的多任务优先级复合... 轮腿式平台在执行复杂作战环境载运任务时,由于其动态协调腿部与车轮运动是复杂耦合的,其行驶速度的稳定性、位姿控制的精确性都十分困难.文中基于轮腿式平台通过有限高度场景的动态协调任务,提出了一种基于前馈补偿的多任务优先级复合运动解耦控制框架.首先,分别建立了关节和车轮动力学模型,降低模型复杂度;然后,搭建了基于任务优先级的前馈关节力矩解算,叠加轮端前馈交互力和反馈控制力矩降低实时位姿调整对质心速度的影响;最后,采用转速闭环PI控制器,并引入车轮滚动阻力实现车轮速度到质心速度的有效传递.仿真结果表明,所提出控制方法在受限场景运动过程中平台质心速度最大跟踪误差小于3%,为轮腿式平台复杂环境下执行任务提供了可行控制框架. 展开更多
关键词 轮腿式平台 前馈补偿 任务优先级 解耦控制
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