检索结果-内蒙古大学图书馆

Extended observer-based consensus tracking control for MASs with external disturbance and dynamic event-triggered strategy

引用

Science China(Technological Sciences) 2025年第3期68卷 228-238页

作者： Jian LIAO Kai MAO Bin XIN Jing HE Yaoqing ZHANG Jun CHENG Delin LUO Shaolei ZHOU College of Physics and Electronic Information Gannan Normal UniversityGanzhou341000China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen518055China College of Basic Science Naval Aviation UniversityYantai264001China School of Automation Beijing Institute of TechnologyBeijing100081China School of Aerospace Engineering Xiamen UniversityXiamen361102China

This article explores the leader-following consensus tracking(LFCK)control issues of multi-agent systems(MASs)in the presence of external disturbances and general directed fixed communication *** purpose is to enable all follower agents to achieve consensus tracking for the leader ***,this article introduces an extended state observer for estimating each follower agent's unknown state and external ***,on the basis of the above-extended state observer and a dynamic event-triggered strategy,a distributed consensus tracking control protocol with disturbances restraint is developed,which can reduce the MAS's update frequency on the premise of ensuring the control protocol's ***,the MAS's stability and the absence of Zeno behavior are analyzed and proved by the established Lyapunov functional and linear matrix inequality ***,the validity and feasibility of the proposed approach are validated through a group of comparative numerical simulation experiments.

关键词： leader-following consensus tracking(LFCK) dynamic event-triggered strategy external disturbances state observer multi-agent systems

来源：评论

学校读者我要写书评

暂无评论

Atmosphere effects on 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) nanoparticle pyrolysis: A ReaxFF molecular dynamics study

引用

Energetic Materials Frontiers 2025年第1期6卷 35-41页

作者： Guan, Jia-lu Dong, Guan-chen Tao, Yi-dan Lv, Jing Tan, Ling-hua Huang, Xiao-na Yang, Guang-cheng School of Chemical Engineering Nanjing University of Science and Technology Nanjing210094 China National Special Superfine Powder Engineering Research Center Nanjing University of Science and Technology Nanjing210094 China China Academy of Engineering Physics Institute of Chemical Materials Mianyang621900 China College of Power and Mechanical Engineering Wuhan University Wuhan430072 China

1,3,5-Triamino-2,4,6-trinitrobenzene (TATB), an insensitive explosive, is exposed to the atmosphere during manufacture, storage and use, which can lead to changes in energy and sensitivity, particularly in nanoparticles. However, the underlying mechanisms of atmosphere effect on TATB pyrolysis remain poorly elucidated due to the limitations of experimental techniques in terms of temporal and spatial scales. This study employs molecular dynamics simulations to explore the impact of common atmospheres, including N2 atmosphere, H2O atmosphere, and NH3 atmosphere, on the pyrolysis of TATB nanoparticles at the atomic level. The results demonstrate that all three atmospheres inhibit TATB pyrolysis, with N2 atmosphere exhibiting the strongest inhibition, followed by NH3 atmospheres, and H2O atmosphere. Regarding the intrinsic mechanism, the inhibitory effects of different atmospheres can be classified into two categories: The influence of N2 atmosphere and H2O atmosphere is inert, as they hardly directly react with TATB but instead hinder the initial dehydrogenation reaction, thereby affecting the formation of key intermediates and final products;in contrast, NH3 atmospheres not only inhibits these reactions but also tends to directly react with TATB to form larger molecules, which remain stable under thermal stimulation and suppress further decomposition of TATB. © 2025 The Authors

关键词： Nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Quantum dots enhanced stability of in-situ fabricated perovskite nanocrystals based light-emitting diodes:Electrical field distribution effects

引用

Fundamental Research 2025年第1期5卷 347-353页

作者： Xulan Xue Menglin Li Zhenjie Liu Chenhui Wang Jincheng Xu Shuangpeng Wang Hanzhuang Zhang Haizheng Zhong Wenyu Ji Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012China MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Institute of Applied Physics and Materials Engineering University of MacaoTaipa 999078China

With the development in fabricating efficient perovskite light emitting diodes(PeLEDs),improving the operating stability becomes an urgent *** we report quantum dot(QD)enhanced stability of PeLEDs by introducing CdSe/ZnS core-shell QDs in toluene anti-solvent during in-situ fabrication of FAPbBr3 perovskite nanocrystals(PNCs)*** comparison with PNC films with pristine toluene as the anti-solvent,the as-prepared FAPbBr3 PNC films with a QD monolayer on the surface exhibit improved photoluminescence quantum yield,enhanced photostability and better *** from these advantages,the peak luminance and the maximum external quantum efficiency of the PeLED containing QD monolayer are increased from 6807 cd/m^(2)to 86,670 cd/m^(2)and 2.4%to 7.1%,*** T50 lifetime under the initial luminance of 1021 cd/m^(2)approaches 83 *** on electrical field simulation and transient electroluminescence measurements,the enhanced stability can be mainly attributed to the electrical field redistribution induced by the QD *** work demonstrates that the combination of QDs and perovskites provides an effective strategy to address the operational stability of *** insights into electrical field distribution effect will make great impact on stability improvement of other perovskite based devices.

关键词： Perovskite nanocrystals Quantum dots Electrical field distribution Light-emitting diodes Operational stability

来源：评论

学校读者我要写书评

暂无评论

Orientation-resolved Cooper-like minimum in high-order harmonic spectrum from asymmetric molecules

引用

Optics Express 2025年第9期33卷 19004-19012页

作者： Xu, Qing-Yun Liu, Xi-Wang Song, Xiao-Hong Chen, Jin Yang, Wei-Feng School of Physics and Optoelectronic Engineering Hainan University Haikou570288 China School of Information and Communication Engineering Hainan University Haikou570288 China Hefei National Laboratory University of Science and Technology of China Hefei National Research Center for Physical Sciences at the Microscale School of Physical Sciences Hefei230026 China Shenzhen Key Laboratory of University Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technology College of Engineering Physics Shenzhen Technology University Shenzhen518118 China Center for Theoretical Physics Hainan University Haikou570288 China

We present the observation of an orientation-resolved Cooper-like minimum in the high-order harmonic spectrum from an asymmetric CO molecule employing the time-dependent density functional theory. By applying a linearly polarized field, we find that obvious minimum contributed by HOMO can be observed in the pure even harmonics with the polarization perpendicular to the laser polarization when the molecular axis is perpendicular to the laser polarization. By contrast, when the molecular axis is along to the laser polarization, a minimum can be identified from odd harmonics, but its position is slightly moved with the pulse intensities and wavelengths partly due to the interference between HOMO and HOMO-2. These findings reinforce the current understanding of cooper-like minimum in HHG from asymmetric molecules, providing a way to observe such minimum in asymmetric molecules for experiments by using the laser field with laser polarization perpendicular to the molecular axis and observing the HHG component with the polarization perpendicular to the laser polarization. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Density functional theory

来源：评论

学校读者我要写书评

暂无评论

Phononic Resonant Relaxation in Magnetic Hysteresis of Single-Molecule Magnets

引用

Chinese physics Letters 2025年第2期42卷 109-124页

作者： Lei Gu Jia Luo Qiancheng Luo Yuanqi Zhai Yan-Zhen Zheng Guoping Zhao College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610068China Frontier Institute of Science and Technology(FIST) Xi’an Jiaotong UniversityXi’an 710054China Center for Magnetism and Spintronics Sichuan Normal UniversityChengdu 610068China

Lanthanide-based single-molecule magnets exhibit broad magnetic hysteresis,which manifests as slow magnetic relaxation in strong magnetic ***,the origin of the nontrivial hysteresis behaviors remains ***,we propose two influential mechanisms:activation of optical-phonon-mediated direct transitions within the ground-state doublet and the resonant Raman *** discoveries,coupled with the g-factor anisotropy,account for the observed hysteresis behaviors in the regimes of fast magnetic *** findings complement the recognized mechanisms used to interpret the magnetic hysteresis of single-molecule magnets.

关键词： process hysteresis magnets

来源：评论

学校读者我要写书评

暂无评论

Strain-tunable electronic properties and quantum capacitance of ScHfCO_(2)MXene as supercapacitor electrodes

引用

Frontiers of physics 2025年第1期20卷 93-104页

作者： Hui Ding Xiao-Hong Li Rui-Zhou Zhang Hong-Ling Cui College of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023China Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang 471023China Longmen Laboratory Luoyang 471023China

MXenes have wide applications in energy storage devices because of their compositional *** and optical properties,Bader charge and quantum capacitance of Janus ScHfCO_(2)MXene under biaxial strain are studied by density functional theory(DFT).The substitution of Hf atoms induces the decrease of the band gap of ScHfCO_(2),which changes from direct semiconductor into indirect *** gap generally increases with the increase of the tensile strain because of the blueshift of Sc-d and Hf-d orbits,and ScHfCO_(2)changes to M→K indirect semiconductor at 5%***_(2)under strains from-5%to 4%maintains the indirect bandgap *** appearance of built-in electric field in ScHfCO_(2)under strain improves the charge redistribution across Janus ***_(2)under compressive strain has better conductivity than ScHfCO_(2)under tensile ***_(2)under strains are all promising cathode *** voltage improves the character of cathode materials because of their much larger|Qc|when compared with those at aqueous system.

关键词： Janus MXene electronic properties quantum capacitance density functional theory charge transfer

来源：评论

学校读者我要写书评

暂无评论

Alkali metal pyridinolate/piperidinolate pairs: A new type of materials for efficient reversible hydrogen storage

引用

Journal of Energy Chemistry 2025年第4期103卷 353-360页

作者： Alexis Munyentwali Yang Yu Xingchi Zhou Wei Zhou Qijun Pei Khai C.Tan Anan Wu Hui Wu Teng He Ping Chen Dalian Institute of Chemical Physics Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry College of Chemistry and Chemical Engineering Xiamen University NIST Center for Neutron Research National Institute of Standards and Technology

Chemical hydrogen storage in organic materials is a promising method thanks to its high storage density,reversibility,and ***,the dehydrogenation process of organic materials requires high temperatures due to their unfavorable thermodynamic *** study proposes a strategy to design a new type of hydrogen storage materials,i.e.,alkali metal pyridinolate/piperidinolate pairs,by combining the effects of a heteroatom and an alkali metal in one molecule to achieve suitable dehydrogenation thermodynamics along with high hydrogen storage *** air-stable compounds can be synthesized using low-cost reactants and water as a green *** predictions indicate that enthalpy changes of dehydrogenation（ΔHd） can be significantly reduced to the optimal range for efficient hydrogen release,exemplified by lithium 2-piperidinolate with a 5.6 wt% hydrogen capacity and a suitable ΔHdof 32.2 kJ/*** results obtained using sodium systems validate the computational predictions,demonstrating reversible hydrogen storage even below 100℃.The superior hydrogen desorption performance of alkali metal piperidinolates could be attributed to their suitable ΔHdinduced by the combined effect of ring nitrogen and metal substitution on their *** study not only reports new low-cost hydrogen storage materials but also provides a rational design strategy for developing metalorganic compounds possessing high hydrogen capacities and suitable thermodynamics for efficient hydrogen storage.

关键词： Alkali metal pyridinolates Alkali metal substitution Hydrogen storage Metalorganic compounds Ring nitrogen

来源：评论

学校读者我要写书评

暂无评论

High-precision measurement system for the Z-cut angle of uniaxial crystals based on conoscopic interference

引用

Optics Express 2025年第8期33卷 17378-17392页

作者： Guo, Guangyan Chow, Yasong Zhong, Tao Wang, Zhe Cheng, Wang Wang, Yonghuan Zhu, Yongjian Yang, Yixuan Shi, Yishi Rong, Lu Wang, Ke Zhang, Tianhao Fan, Zhongwei Department of Optical Engineering Research Aerospace Information Research Institute Chinese Academy of Sciences Beijing100094 China School of Optoelectronics University of Chinese Academy of Sciences Beijing100049 China College of Physics and Electronic Engineering Chongqing Normal University Chongqing401331 China School of Physics and Optoelectronic Engineering Beijing University of Technology Beijing100124 China

Pockels cells require the surface normal of the potassium dihydrogen phosphate (KDP) crystal to be aligned parallel to the crystal’s optical axis. Minor cutting errors, notably incorrect Z-cut angles, can impair the electro-optic modulation capability. We propose a high-precision measurement system for the Z-cut angle of uniaxial crystals based on conoscopic interference. This system uses a motion compensation trajectory, derived from reflected light coordinates, to correct tilt and rotation errors. This approach obviates the need for real-time posture monitoring during tests and maintains crystal alignment to within 0.02 mrad. The ray tracing model correlates the Z-cut angle with melatope trajectory radii in the interference patterns, achieving a spatial resolution error below 0.3 µrad/pix, mainly due to lens reinstallation errors. Experimental results indicate that the Z-cut angles achieves a Peak-to-Valley (PV) of less than 0.03 mrad and a Root Mean Square (RMS) of less than 0.01 mrad. Compared to the best parameters reported by other researchers, this system offers 2.25 times better repeatability and 1.65 times finer spatial resolution. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Ray tracing

来源：评论

学校读者我要写书评

暂无评论

Smart urban transportation: advancing IoT-based thermal management for lithium-ion EV battery packs

引用

Discover Internet of Things 2025年第1期5卷 1-11页

作者： Das, S.R. Mohapatra, S.K. Kamila, N.K. Mohanty, S.P. Swain, K.P. Department of Computer Science Engineering Department GITA Autonomous College Bhubaneswar India Department of ETC Trident Academy of Technology Odisha Bhubaneswar India CSE Department GITA Autonomous College Odisha Bhubaneswar India Department of Physics GITA Autonomous College Odisha Bhubaneswar India

Introduction: In urban transportation, EVs are emerging as a crucial revolution that offers insignificant environmental effects, low noise pollution, better efficiency, and freedom from fossil fuels. However, EVs suffer from many challenges with battery packs. Objective: This study aims to design a battery pack with a comprehensive thermal management strategy for the extension of operational lifespan, which will allow for a rapid transition towards sustainable smart urban transportation. Materials and methodology: This study emphasizes the issues related to reliability, safety, driving range, capacity, charging, and discharging duration of battery packs. Particular focus is given to the operational temperature of individual cells in the battery pack in a safer zone by implementing various technologies like a heat sink, Peltier module, cooling fan, cold plate, water block, fan grill, and coolant pump. An IoT arrangement is proposed to monitor the temperature using Node-MCU (ESP8266) in association with the DS18B20 sensor and Blynk cloud. Results: The study shows that efficient thermal management positively affects charging and discharging efficiency, cell balancing, cycle life, and capacity retention of EVs. Also, the temperature of the condition is monitored by an Android app. Conclusion: In conclusion, the thermal management solution of an EV battery pack is implemented using various methods, and IoT technology is also utilized to monitor the condition of the battery pack. © The Author(s) 2025.

关键词： Battery Pack

来源：评论

学校读者我要写书评

暂无评论

Symmetry-broken atomic ensemble induced by mandated charge for efficient water dissociation in hydrogen generation

引用

Journal of Energy Chemistry 2025年第4期103卷 274-281页

作者： Ruofan Shen Yanyan Liu Shuling Liu Jianchun Jiang Tao Liu Sehrish Mehdi Ting-Hui Xiao Erjun Liang Baojun Li Laboratory of Zhongyuan Light Key Laboratory of Materials Physics Ministry of Education School of Physics Zhengzhou University College of Science Henan Agricultural University College of Chemistry Zhengzhou University National Engineering Lab.for Biomass Chemical Utilization Institute of Chemical Industry of Forest Products Chinese Academy of Forestry CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety National Centre for Nanoscience and Technology

Efficient water dissociation catalysts are important for reducing the activation energy barrier of water molecules in the field of energy conversio ***,symmetry-bro ken Rh ensemble induced by mandated charge was established to boost the catalytic activity toward water *** an experimental verification,the turnover frequency of 1.0-RTOV4in hydrogen generation from ammonia borane hydrolysis reaches up to 2838 min-1(24828 min-1depend on Rh dispersion),exceeding the benchmark set up by state-of-the-art *** transfer of mandated charge from OVto Rh near OVbreaks the local symmetry of Rh nanoparticle and forms Rhγ-（electron-aggregation Rh）-Rh interfacial atomic *** symmetry-broken Rh ensemble is the reason for the high activity of the *** work provides an effective electronic regulation strategy based on symmetry-broken atomic ensemble induced by mandated charge,designed to stimulate the limiting activity of metal catalyst in the field of next generation energy chemistry.

关键词： Ammonia borane Hydrogen generation Interfacial atomic ensemble Mandated charge Symmetry-broken

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：