检索结果-内蒙古大学图书馆

Safe Efficient Policy Optimization Algorithm for Unsignalized Intersection Navigation

IEEE/CAA Journal of Automatica Sinica 2024年第9期11卷 2011-2026页

作者： Xiaolong Chen Biao Xu Manjiang Hu Yougang Bian Yang Li Xin Xu State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body the College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body the College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082 Wuxi Intelligent Control Research Institute(WICRI)of Hunan University Wuxi 214115China College of Intelligence Science and Technology Institute of Unmanned SystemsNational University of Defense TechnologyChangsha 410073China

Unsignalized intersections pose a challenge for autonomous vehicles that must decide how to navigate them safely and *** paper proposes a reinforcement learning(RL)method for autonomous vehicles to navigate unsignalized intersections safely and *** method uses a semantic scene representation to handle variable numbers of vehicles and a universal reward function to facilitate stable learning.A collision risk function is designed to penalize unsafe actions and guide the agent to avoid them.A scalable policy optimization algorithm is introduced to improve data efficiency and safety for vehicle learning at *** algorithm employs experience replay to overcome the on-policy limitation of proximal policy optimization and incorporates the collision risk constraint into the policy optimization *** proposed safe RL algorithm can balance the trade-off between vehicle traffic safety and policy learning *** intersection scenarios with different traffic situations are used to test the algorithm and demonstrate its high success rates and low collision rates under different traffic *** algorithm shows the potential of RL for enhancing the safety and reliability of autonomous driving systems at unsignalized intersections.

关键词： Autonomous driving decision-making reinforcement learning(RL) unsignalized intersection

来源：评论

学校读者我要写书评

暂无评论

Chip Architecture Design Management Based on Low-Power Multitasking Simulation 9

Chip Architecture Design Management Based on Low-Power Multi...

引用

9th International Conference on Advances in Machinery, Materials science and Engineering Applications, MMSE 2023

作者： Zhang, Ying Sun, Kai National Key Laboratory of Science and Technology on Aerospace Intelligent Beijing Aerospace Automatic Control Institute Beijing100854 China

ISBN: (纸本)9781643684383

From the aspects of low-power DSP design, low-power SOC design, and low-power power switch design, this paper proposes a chip architecture 'high-low matching' scheme for low-power multitasking requirements. The low-power DSP design starts with operating voltage and operating frequency control, and uses three low-power modes, PD1, PD2, and PD3;the low-power SOC design carries out low-power mode management from the clock control of APB and AHB bus;In terms of low-power power switch design, no-load low-power control, and input under-voltage protection, output over-voltage protection, over-temperature protection, and output over-current protection are implemented. The paper proposes different low-power control modes. After the evaluation of the built test platform, it is proved that the design of the scheme is reasonable, and it can realize the engineering application of low-power multi-task management. © 2023 The Authors.

关键词： Electric power utilization

来源：评论

学校读者我要写书评

暂无评论

Recent advances in one-dimensional alkali-metal hexatitanate photocatalysts for environmental remediation and solar fuel production

引用

Journal of Materials science & technology 2024年第35期202卷 201-239页

作者： Qiang Wang Xiaofan Yang Zhao Jing Hong Liu Pengyi Tang Hongmin Zhu Bing Li National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China 2020 X-Lab Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Department of Metallurgy Graduate School of EngineeringTohoku UniversitySendai 980-8579Japan

The global energy crisis and environmental problems have become two unprecedented ***-conductor photocatalysis offers a promising strategy to solve them,while its practical application requires advanced photocatalytic *** recent years,one-dimensional(1D)alkali-metal hexatitanate(AHT)photocatalysts have attracted considerable attention in energy and environmental fields due to their high chemical stability,excellent photoactivity,unique ion-exchange,environment-friendly,and cost-effective *** this review,we firstly introduce the basic properties of AHT including crystal and electronic band structure,photoactivity,and structure-property-performance ***,the recent ad-vances in synthesis and modification strategies of 1D AHT photocatalysts are summarized thoughtfully,followed by a comprehensive discussion on their various environmental and energy applications,includ-ing pollutant degradation,H2 generation,and CO_(2)***,the key challenges and prospects are also highlighted for the development of high-performance 1D AHT-based photocatalysts for practi-cal *** hope that this review will shed some light on the rational design of 1D Ti-O-based nanomaterials for efficient environmental remediation and solar fuel production.

关键词： Alkali-metal hexatitanates One-dimensional nanomaterials Photocatalysis Pollutant degradation Solar fuels

来源：评论

学校读者我要写书评

暂无评论

ADAPTIVE ITERATIVE LEARNING TORQUE control OF ELECTRO-HYDRAULIC LOAD SIMULATOR

ADAPTIVE ITERATIVE LEARNING TORQUE CONTROL OF ELECTRO-HYDRAU...

引用

2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Shu, Sheng Wu, Shuai School of Automation Science and Electrical Engineering Beihang University Beijing China National Key Laboratory of Aircraft Integrated Flight Control Beihang University Beijing China Key Laboratory of Advanced Aircraft Systems Beihang University Ministry of Industry and Information Technology Beijing China Ningbo Institute of Technology Beihang University Ningbo China

The electro-hydraulic load simulator which can simulate the load executed on the aircraft actuator in the process of flight is an important ground test equipment. The uncertainties of the system including the disturbances caused by the motion of actuator make it challenging to achieve high performance. This study develops an adaptive iterative learning controller for the torque control of electro-hydraulic load simulator utilizing the backstepping method. On the basis of adaptive backstepping control, this controller incorporates iterative learning law to learn unknown nonlinear functions. By utilizing the repetitive characteristic of the test equipment, the iterative learning law sacrifices learning time to achieve enhanced control performance. To handle unknown disturbances, filter error, and learning error, a robust term described by dynamic equations is constructed. The calculation of the derivative of the virtual control law is simplified with a first-order command filter. Simulations with three different controllers are obtained to illustrate the learning ability of the proposed controller. © The Institution of Engineering & technology 2024.

关键词： Backstepping

来源：评论

学校读者我要写书评

暂无评论

Experimental and theoretical study on the dynamic effective stress of loaded gassy coal during gas release

引用

International Journal of Mining science and technology 2023年第3期33卷 339-349页

作者： Bing Zhang Hanpeng Wang Peng Wang Guofeng Yu Shitan Gu School of Qilu Transportation Shandong UniversityJinan 250061China Geotechnical and Structural Engineering Research Center Shandong UniversityJinan 250061China Coal Mining National Engineering Technology Research Institute Huainan 232001China State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China

In the process of mining coalbed methane(CBM),an unsteady state often arises due to the rapid extraction,release and pressure relief of *** this case,the effective stress of coal changes dynamically,affecting the stability of the gassy coal *** this paper,gas release tests of gassy coal under conventional triaxial compression were performed,and the dynamic effective stress(DES)during gas release was obtained indirectly based on a constitutive equation and deformation of *** results show that the maximum increases in DES caused by the release of free gas and adsorbed gas under the stress of 1.1 MPa were 0.811 and 5.418 MPa,respectively,which seriously affected the stress state of the *** the gas release,the free gas pressure and the adsorbed gas volume were the parameters that directly affected the DES and showed a positive linear relationship with the DES with an intercept of *** DES of the coal sample increased exponentially with time,which was determined by the contents of free and adsorbed *** on the experimental results and theoretical analysis,an effective stress model was obtained for loaded gassy coal during gas *** results of verification indicated accuracy greater than 99%.

关键词： Gassy coal Dynamic effective stress Gas release Gas-solid coupling Mathematical model

来源：评论

学校读者我要写书评

暂无评论

Reliability analysis of arresting hook engaging arresting cable for carrier-based aircraft influenced by multifactors

引用

Chinese Journal of Aeronautics 2023年第1期36卷 311-323页

作者： Yiming PENG Yin YIN Pengpeng XIE Xiaohui WEI Hong NIE State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and AstronauticsNanjing 210016China Shanghai Institute of Spacecraft Equipment Shanghai 200240China

The carrier-based aircraft landing and arrest process is complex and nonlinear,and includes the coupling effect between the aircraft and arresting *** has many uncertain factors,which lead to difficulty in the reliability *** make the reliability analysis more accurate and effective,this paper presents some *** a certain type of carrier-based aircraft as the research object,a dynamic model of the landing and arrest cable was established,and the accuracy of the model was verified using laboratory test *** on the model,this paper shows how the key parameters,including the sinking velocity,pitch angle and horizontal velocity,affect the collision rebound performance of the arresting *** that,a limit state equation of the arresting hook system’s reliability was *** the implicit limit state equation,a surrogate model of the reliability of the arresting hook was established using the Support Vector Machine(SVM)method,and then reliability analysis was carried out using the Monte Carlo ***,it was explained in detail how the key parameters affect the reliability of the hook engaging the arresting cable,and some meaningful conclusions were *** analysis method and its results can provide a reference for the top-level parameter design of carrier-based aircraft and reliability research on the arresting systems.

关键词： Arresting cable Arresting devices Dynamics Reliability Support Vector Machines

来源：评论

学校读者我要写书评

暂无评论

Pore structure characterization and seepage analysis of ionic rare earth orebodies based on computed tomography images

引用

International Journal of Mining science and technology 2022年第2期32卷 411-421页

作者： Xianping Luo Yongbing Zhang Hepeng Zhou Kunzhong He Boyuan Zhang Dongming Zhang Weijing Xiao National Innovation Center for Rare Earth Functional Material Jiangxi University of Science and TechnologyGanzhou 341000China Key Laboratory of Ionic Rare Earth Resources Development and Application Ministry of EducationJiangxi University of Science and TechnologyGanzhou 341000China Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou 341000China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China

Pore network structure of ore body is a diffusion channel of leaching agent solution that exerts a significant influence on *** ore body structure,pore distribution,pore and throat size,and pore network characteristics of topsoil,weathered,and semiweathered layers of ionic rare earth ore in southern Jiangxi Province were explored in this *** effect of leaching operation on the pore structure was investigated,and main factors affecting the seepage were *** showed that the semiweathered layer presents a dense structure and a small number of unconnected *** of topsoil and weathered layers are mainly long and narrow column openings with some planar *** pore distribution and large size span were *** with the weathered layer,the topsoil layer demonstrates larger voids,smaller average pore volume and equivalent radius,and fewer coordination throats;however,the average equivalent radius of the throat in the topsoil layer is larger and largescale channels exist through ore body ***,permeability of the topsoil layer is significantly higher than that of the weathered *** clay minerals migrate easily and the occurrence of silting in the small porosity blocks the throat and significantly decreases the permeability of the ore body in the leaching *** equivalent radius of the throat is the key to the *** the migration of fine particles is an effective measure to protect the throat and shorten the leaching period.

关键词： Ionic rare earth ore CT scanning 3D visualization Pore characteristics Permeability

来源：评论

学校读者我要写书评

暂无评论

Improving hole transfer of boron nitride quantum dots modified PDI for efficient photodegradation

引用

Frontiers of Chemical science and Engineering 2023年第11期17卷 1718-1727页

作者： Shiqing Ma Chundong Peng Zeyu Jia Yanmei Feng Kai Chen Hao Ding Daimei Chen Zhong-Yong Yuan Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastesNational Laboratory of Mineral MaterialsSchool of Material Sciences and TechnologyChina University of GeosciencesBeijing 100083China School of Materials Science and Engineering Nankai UniversityTianjin 300350China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoringand Pollution Control School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China

In recent years,organic photocatalyst under visible-light absorption has shown significant potential for solving environmental ***,it is still a great challenge for constructing a highly active organic photocatalyst due to the low separation efficiency of photogenerated ***,an effective and robust photocatalyst perylene-3,4,9,10-tetracarboxylic diamide/boron nitride quantum dots(PDI/BNQDs),consisting of selfassemble PDI withπ–πstacking structure and BNQDs,has been constructed and researched under visible light *** PDI/BNQDs composite gradually increases organic pollutant photodegradation with the loading amount of *** 10 mL of BNQDs solution added(PDI/BNQDs-10),the organic pollutant photodegradation performance reaches a maximum,about 6.16 times higher with methylene blue and 1.68 times higher with ciprofloxacin than that of pure PDI *** enhancement is attributed to improved separation of photogenerated carriers from self-assembled PDI by BNQDs due to their preeminent ability to extract *** work is significant for the supplement of PDI supramolecular composite *** believe that this photocatalytic design is capable of expanding organic semiconductors’potential for their applications in photocatalysis.

关键词： PDI boron nitride quantum dots photocatalysis hole transfer

来源：评论

学校读者我要写书评

暂无评论

Biosynthetic CdS-Thiobacillus thioparus hybrid for solar-driven carbon dioxide fixation

引用

Nano Research 2023年第4期16卷 4531-4538页

作者： Guangyu Liu Feng Gao Hongwei Zhang Lei Wang Chao Gao Yujie Xiong Hefei National Laboratory for Physical Sciences at the Microscale and School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science Center350 Shushanhu Rd.Hefei 230031China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Synergistically combining biological whole-cell bacteria with man-made semiconductor materials innovates the way for sustainable solar-driven CO_(2)fixation,showing great promise to break through the bottleneck in traditional chemical photocatalyst ***,most of the biohybrids require uneconomical organic nutrients and anaerobic conditions for the successful cultivation of the bacteria to sustain the CO_(2)fixation,which severely limits their economic viability and applicability for practical ***,we present an inorganic-biological hybrid system composed of obligate autotrophic bacteria Thiobacillus thioparus(***)and CdS nanoparticles(NPs)biologically precipitated on the bacterial surface,which can achieve efficient CO_(2)fixation based entirely on cost-effective inorganic salts and without the restriction of anaerobic *** optimized interface between CdS NPs and *** formed by biological precipitation plays an essential role for *** efficiently receiving photogenerated electrons from CdS NPs and thus changing the autotrophic way from chemoautotroph to *** a result,the *** biohybrid realizes the solar-driven CO_(2)fixation to produce multi-carbon glutamate synthase and biomass under visible-light irradiation with CO_(2)as the only carbon *** work provides significant inspiration for the further exploration of the solar-driven self-replicating biocatalytic system to achieve CO_(2)fixation and conversion.

关键词： biohybrids solar-driven CO_(2)fixation carbon cycle autotrophic bacteria Thiobacillus thioparus cadmium sulfide

来源：评论

学校读者我要写书评

暂无评论

Direct characteristic-function tomography of the quantum states of quantum fields

引用

science China(Physics,Mechanics & Astronomy) 2023年第11期66卷 119-125页

作者： Zehua Tian Jiliang Jing Jiangfeng Du CAS Key Laboratory of Microscale Magnetic Resonance School of Physical SciencesUniversity of Science and Technology of ChinaHefei230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei230026China Department of Physics Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Educationand Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha410081China Hefei National Laboratory University of Science and Technology of ChinaHefei230088China School of Physics Zhejiang UniversityHangzhou310027China

Herein,we propose a novel strategy for implementing a direct readout of the symmetric characteristic function of the quantum states of quantum fields without the involvement of idealized measurements,an aspect that has always been deemed ill-defined in quantum field *** proposed scheme relies on the quantum control and measurements of an auxiliary qubit locally coupled to the quantum *** mapping the expectation values of both the real and imaginary parts of the field displacement operator to the qubit states,the qubit's readout provides complete information regarding the symmetric characteristic *** characterize our technique by applying it to the Kubo-Martin-Schwinger(thermal)and squeezed states of a quantum scalar *** addition,we have discussed general applications of this approach to analogue-gravity systems,such as Bose-Einstein condensates,within the scope of state-of-the-art experimental *** proposed strategy may serve as an essential in understanding and optimizing the control of quantum fields for relativistic quantum information applications,particularly in exploring the interplay between gravity and quantum,for example,the relation to locality,causality,and information.

关键词： characteristic-function tomography quantum fields Ramsey interferometry analogue gravity

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：