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DPT‐tracker:Dual pooling transformer for efficient visual tracking

CAAI Transactions on Intelligence technology 2024年第4期9卷 948-959页

作者： Yang Fang Bailian xie Uswah Khairuddin Zijian Min Bingbing Jiang Weisheng Li Key Laboratory of Data engineering and Visual Computing Chongqing University of Posts and TelecommunicationsChongqingChina Department of mechanical Precision engineering Malaysia‐Japan International Institute of TechnologyUniversity of Technology MalaysiaKuala LumpurMalaysia Department of electrical and Computer engineering Inha UniversityIncheonRepublic of Korea school of Information Science and technology Hangzhou Normal UniversityHangzhouChina

Transformer tracking always takes paired template and search images as encoder input and conduct feature extraction and target‐search feature correlation by self and/or cross attention operations,thus the model complexity will grow quadratically with the number of input *** alleviate the burden of this tracking paradigm and facilitate practical deployment of Transformer‐based trackers,we propose a dual pooling transformer tracking framework,dubbed as DPT,which consists of three components:a simple yet efficient spatiotemporal attention model(SAM),a mutual correlation pooling Trans-former(MCPT)and a multiscale aggregation pooling Transformer(MAPT).SAM is designed to gracefully aggregates temporal dynamics and spatial appearance information of multi‐frame templates along space‐time *** aims to capture multi‐scale pooled and correlated contextual features,which is followed by MAPT that aggregates multi‐scale features into a unified feature representation for tracking *** tracker achieves AUC score of 69.5 on LaSOT and precision score of 82.8 on Track-ingNet while maintaining a shorter sequence length of attention tokens,fewer parameters and FLOPs compared to existing state‐of‐the‐art(SOTA)Transformer tracking *** experiments demonstrate that DPT tracker yields a strong real‐time tracking baseline with a good trade‐off between tracking performance and inference efficiency.

关键词： human‐computer interfacing image motion analysis pattern recognition signal processing tracking

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基于混合式八叉树模型的数控加工几何仿真

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系统仿真学报 2004年第4期16卷 733-735页

作者：吴宏杜建铭贠敏河南科技大学机电工程学院洛阳471004 西安交通大学机械工程学院西安710049

将混合式八叉树数据结构引入数控加工的几何仿真算法,并在简单的层次数据结构基础上加入了曲面的边界信息;叙述了从零件实体的CSG模型或B-Rep模型转换为相应的混合式八叉树数据结构过程中采用的方法,且在这一混合式八叉树模型的基础之... 详细信息

将混合式八叉树数据结构引入数控加工的几何仿真算法,并在简单的层次数据结构基础上加入了曲面的边界信息;叙述了从零件实体的CSG模型或B-Rep模型转换为相应的混合式八叉树数据结构过程中采用的方法,且在这一混合式八叉树模型的基础之上完成了仿真过程;最后通过一个零件数控加工几何仿真实例验证了所提出的算法的可行性和有效性。

关键词：几何仿真数控混合式八叉树模型数据结构

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The Effects of the Geometry of a Current Collector with an Equal Open Ratio on Output Power of a Direct Methanol Fuel Cell

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Energy engineering 2024年第5期121卷 1161-1172页

作者： Yingli Zhu Jiachi xie Mingwei Zhu Jun Zhang Miaomiao Li Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry&Food Machinery and Equipment School of Mechanical EngineeringTianjin University of Science&TechnologyTianjin300222China Tianjin College University of Science and Technology BeijingTianjin301830China Jiangsu Key Laboratory of Precision and Micro-Manufacturing technology College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China

The open ratio of a current collector has a great impact on direct methanol fuel cell(DMFC)*** a number of studies have investigated the influence of the open ratio of DMFC current collectors,far too little attention has been given to how geometry(including the shape and feature size of the flow field)affects a current collector with an equal open *** this paper,perforated and parallel current collectors with an equal open ratio of 50%and different feature sizes are designed,and the corresponding experimental results are shown to explain the geometry effects on the output power of the *** results indicate that the optimal feature sizes are between 2 and 2.5 mm for both perforated and parallel flow field in the current collectors with an equal open ratio of 50%.This means that for passive methanol fuel cells,to achieve the highest output power,the optimal feature size of the flow field in both anode and cathode current collectors is between 2 and 2.5 mm under the operating mode of this *** effects of rib and channel position are also investigated,and the results indicate that the optimum pattern depends on the feature sizes of the flow field.

关键词： Direct methanol fuel cell geometry open ratio current collector position

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The preface: Toward higher-Tc superconductivity under lower pressure——from binary to ternary superhydrides

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National Science Review 2024年第7期11卷 7-8页

作者： Fu-Chun Zhang Ho-kwang Mao Xin-Cheng xie Kavli Institute for Theoretical Sciences University of Chinese Academy of Sciences Shanghai Advanced Research in Physical Sciences Center for High Pressure Science and technology Advanced Research International Center for Quantum Materials School of Physics Peking University

Superconductivity——the phenomenon of complete vanishing of electrical resistance and expulsion of magnetic field——is the paramount electromagnetic property for technological advancement that is only shackled by th... 详细信息

关键词： HYDRIDE

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Significantly enhanced performance and conductivity mechanism in Nb/Mn co-doped CaBi_(4)Ti_(4)O_(15)ferroelectrics

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Journal of Materiomics 2024年第3期10卷 652-669页

作者： Jiageng Xu Shaoxiong xie Qian Xu Jie Xing Qingyuan Wang Jianguo Zhu school of Aeronautics and Astronautics Sichuan UniversityChengdu610000China Institute for Advanced Study Chengdu UniversityChengdu610106China Department of mechanical engineering Kyushu UniversityFukuoka819-0395Japan College of Architecture and Environment Sichuan UniversityChengdu610065China College of Material Science and engineering Sichuan UniversityChengdu610065China

With the rapid development of high-end industries,the demand for high-temperature piezoelectric materials is significantly ***,realizing the ultra-high performance to meet more ap-plications still faces major scientific and engineering challenges of our ***,a new Nb/Mn co-doped CaBi_(4)Ti_(4)O_(15)(CBT)high-temperature piezoelectric material system of CaBi_(4)Ti_(4-x)(Nb_(2/3)Mn_(1/3))_(x)O_(15)was synthesized by the conventional solid-state sintering *** results show that the addition of the dopants tends to break the long-range ferroelectric chain and soften the flexibility of polarization,resulting in more distorted crystal structure and better ferroelectric properties of CBT *** ultra-high piezoelectric constant(d_(33)=26.8 pC/N)is thus attained in CBT-based ceramics with x=0.12,which is about several times larger than that of pure CBT ***,numerous nano-sized layered domain structures that lie on the lateral plane of grains are observed in ceramics,with lower domain wall energy and better dynamic features under electric fields,mainly responsible for the origin of enhanced ***,excess dopants could make the conductivity mechanism of CBT ceramics transform from p-type to n-type,and also result in a shift of conduction relaxation mechanism from defect dipole rotation polarization to electron relaxation *** work not only provides a promising candidate for high-temperature piezoelectric materials,but also opens a window for opti-mizing performance by tailoring domain structures using chemical modification.

关键词： CaBi_(4)Ti_(4)O_(15) Lattice distortion electrical performance Domain structure Conductivity mechanism

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On-line Forecast of Bolt Failure Based on Piezoelectric Ceramic

On-line Forecast of Bolt Failure Based on Piezoelectric Cera...

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第二届仪器科学与技术国际学术研讨会

作者： xie Weidong Weng Zeyu Liu Wenqiang Wang Lei Pan Li College of mechanical & electrical engineering Zhejiang university of technology china

＜正＞ In order to identify bolt failures by analyzing the electromechanical-coupling model of the piezoelectric ceramic film, the method of On-line Forecast of bolt failure was studied. A structural sample of intelligent bolt-groupware using piezoelectric materials was given and an on-line forecast method of bolt failure was presented according to Pauta Criterion. The test system of On-line Forecast of bolt failure and its test data was also given. The study results showed that bolt failure can be identified effectively by means of monitoring the change of total electric-charge on piezoelectric film and the forecast method has great adaptability.

关键词： piezoelectric Ceramic intelligent bolt-groupware failure forecast

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Spectroscopic and temperature sensing properties of Sm3+ in self-activated CsLu（WO4）2 phosphors

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Journal of Rare Earths 2024年第11期42卷 2033-2042页

作者： Mingjun Song Jing Wang Zhi xie Li Liu Wang Zhao Weiwei Zhou school of Chemistry Chemical and Environmental EngineeringWeifang University College of mechanical and electrical engineering Fujian Agriculture and Forestry University school of Chemistry and Materials engineering Huainan Normal University

In this research,a series of Sm3+doped CsLu（WO4）2phosphors was prepared via high temperature solid phase technique to design new red phosphors and optical thermometric *** structures,morphology,band gap and luminescence properties were characterized by X-ray diffraction,scanning electron microscopy,diffuse reflection and luminescence spectra,*** UV excitation,CsLu（WO4）2gives rise to a blue broad emission band between 350 and 700 nm,which stems from the3T1u→1A1gtransition of *** Sm3+is introduced into CsLu（WO4）2,energy transfer between WO66-groups and Sm3+ions takes place in CsLu（WO4）2:Sm3+phosphors,and color-tunable luminescence from blue to red is realized by controlling the Sm3+doping *** energy transfer efficiency between WO66-groups and Sm3+ons was analyzed,and the energy transfer mechanism was determined to be dipole-dipole *** to the temperature-dependent luminescence spectra,WO66-groups and Sm3+ions exhibit large discrepancy in thermal quenching rates,and thus the temperature sensing properties of CsLu（WO4）2:Sm3+in the temperature range of 283-403 K were *** on the framework of fluorescence intensity ratio theory,the basic optical thermometry parameters including absolute and relative sensitivity of CsLu（WO4）2:Sm3+we re calculated and the results show that it has great potential for application in optical thermometry.

关键词： Energy transfer Fluorescence intensity ratio Optical thermometry Phosphors Rare earths

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Design of Magnetic Azimuth Measurement System Based on GMR Sensor

Design of Magnetic Azimuth Measurement System Based on GMR S...

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第24届中国控制与决策会议

作者： Xueli Zheng 1 , Jingqi Fu 2 1. school of mechanical and electrical engineering and Automation, Shanghai university, Shanghai 200072, china2. school of mechanical and electrical engineering and Automation, Shanghai university, Shanghai 200072, china

Magnetic azimuth is one of the important parameters of the directional navigation, it provides an important basis for navigation. First, the author deduces the mathematical model of geomagnetic azimuth measurement system, and achieves the full range of measurement of magnetic azimuth through the method of quadrant discriminant. Then, in this paper, it introduces the hardware and software design of the magnetic azimuth measurement system based on the GMR sensor, accelerometer, temperature sensor and microprocessors etc. Finally, this paper gives the actual measurement results of the azimuth measurement system rotated in the horizontal plane. The results show that the system can accurately capture faint magnetic changes, which will meet the requirements of the navigation orientation, and provide a reliable magnetic field data and realize basis for the magnetic azimuth calculation.

关键词： GMR Sensor Magnetic Azimuth Quadrant Discriminant Method

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五杆式人机合作机器人控制策略仿真研究

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系统仿真学报 2008年第20期20卷 5596-5599页

作者：路敦民张立勋杨向东陈恳北京林业大学工学院北京100083 哈尔滨工程大学机电工程学院黑龙江哈尔滨150001 清华大学精仪系北京100084

轨迹控制策略是人机合作机器人实现人机合作的重要条件。介绍了五杆Cobot的机构及其控制系统,提出了基于速度约束和位置约束的人机合作机器人轨迹控制策略,建立了相应的控制模型。两种控制策略均具有被动和约束的特征,主要区别是产生控... 详细信息

轨迹控制策略是人机合作机器人实现人机合作的重要条件。介绍了五杆Cobot的机构及其控制系统,提出了基于速度约束和位置约束的人机合作机器人轨迹控制策略,建立了相应的控制模型。两种控制策略均具有被动和约束的特征,主要区别是产生控制量的方法不同。利用MATLAB对两种控制策略跟踪直线和圆弧轨迹进行了仿真,结果表明,两种控制策略均可实现人机合作的要求,但位置约束控制策略轨迹约束精度更高一些。

关键词：人机合作机器人虚拟轨迹控制控制策略速度约束位置约束

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Performance Compensation of GMR-based Magnetic Azimuth Measurement System

Performance Compensation of GMR-based Magnetic Azimuth Measu...

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第24届中国控制与决策会议

The magnetic azimuth is one of the important parameters of the directional navigation. This paper proposes a magnetic azimuth measurement system based on the GMR sensor. With the thoughts of information fusion, we study the performance compensation method of magnetic azimuth measurement system based on the radial basis function （RBF） neural network and the BP neural network, and then establish a coupling disturbance compensation model of the magnetic field and the temperature. The experimental results illustrate that the maximum full-scale error of sensor output without compensation is ±21.3%, and the maximum full-scale error after the coupling compensation of the BP neural network and the RBF neural network are ±2.72% and ±0.52% respectively.

关键词： GMR Sensor Magnetic Azimuth RBF Neural Networks Coupling Compensation

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