检索结果-内蒙古大学图书馆

An efficient schedulability analysis based on worst-case interference time for real-time systems

science China(Information sciences) 2024年第9期67卷 88-104页

作者： Hongbiao LIU Mengfei YANG Lei QIAO Xi CHEN Jian GONG School of Computer Science and Technology Xidian University China Academy of Space Technology Beijing Institute of Control Engineering

Real-time systems are widely implemented in the Internet of Things(IoT) and safety-critical systems, both of which have generated enormous social value. Aiming at the classic schedulability analysis problem in real-time systems, we proposed an exact Boolean analysis based on interference(EBAI) for schedulability analysis in real-time systems. EBAI is based on worst-case interference time(WCIT), which considers both the release jitter and blocking time of the task. We improved the efficiency of the three existing tests and provided a comprehensive summary of related research results in the field. Abundant experiments were conducted to compare EBAI with other related results. Our evaluation showed that in certain cases, the runtime gain achieved using our analysis method may exceed 73% compared to the stateof-the-art schedulability test. Furthermore, the benefits obtained from our tests grew with the number of tasks, reaching a level suitable for practical application. EBAI is oriented to the five-tuple real-time task model with stronger expression ability and possesses a low runtime overhead. These characteristics make it applicable in various real-time systems such as spacecraft, autonomous vehicles, industrial robots, and traffic command systems.

关键词： five-tuple real-time task model real-time system spacecraft Internet of Things exact schedulability analysis worst-case interference time

来源：评论

学校读者我要写书评

暂无评论

Nonaqueous amine-based absorbent for energy-efficient CO2 capture: Effect of shifting solvent on kinetic behaviors

引用

Journal of Industrial and engineering Chemistry 2025年 149卷 849-858页

作者： Long, Qinghai Wang, Jing Ping, Tiantian Shen, Shufeng School of Chemical and Pharmaceutical Engineering Hebei University of Science and Technology Shijiazhuang050018 China

Nonaqueous absorbents have shown great potential in lowering regeneration energy for energy-efficient CO2 capture. The effect of reaction media with varying solvent characteristics (polarity, solubility parameter and dielectric constant) on kinetic behaviors deserves to be discovered. In this work, CO2 absorption flux against CO2 partial pressure was determined in a stirred cell reactor at temperatures of 283.2–303.2 K with 1.0–5.0 mol L−1 2-(butylamino)ethanol (BAE) in nonaqueous 2-butoxyethanol (2-BE). Physicochemical properties and the physical mass transfer coefficients were also measured and represented by proposed correlations. The overall reaction rate constants were derived under the well-defined pseudo-first-order regime conditions. The partial reaction order with respect to BAE was found to be about 2.0 in 2-BE and 1.0–1.3 in water respectively, which reveals that the formation of ionic products may be highly depressed in solvent with low Hansen solubility parameter (HSP) resulting in the increasing reaction order. The overall third-order kinetic data can be well represented by termolecular mechanism model with AARD of 10.5 %. The findings will provide fundamental support for further pilot-scale performance demonstration. © 2025 The Korean Society of Industrial and engineering Chemistry

关键词： Rate constants

来源：评论

学校读者我要写书评

暂无评论

Introducing ionic mediators to construct peak-splitting manganese oxide structures for efficient oxygen reduction reactions

引用

Journal of Materials science & technology 2024年第34期201卷 139-148页

作者： Haoliang Ma Xiong Li Mengmeng Tian Lanlan Li Xiaofei Yu Xinghua Zhang Zunming Lu Xiaojing Yang School of Materials Science and Engineering Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologyHebei University of TechnologyTianjin 300130China School of Artificial Intelligence and Information Technology Nanjing University of Chinese MedicineNanjing 210023China

Manganese oxides have received extensive attention in Oxygen Reduction Reaction(ORR)***-ever,the poor electrical conductivity and oxygen adsorption capacity of manganese oxides limit their development,so it is necessary to prepare catalysts with highly active *** propose a method to introduce an ionically conductive medium and induce structural distortion via thermodynamics,re-sulting in novel peak-splitting highly active structures for enhanced oxygen reduction *** the aid of refined structural analysis,High-angle annular dark-field(HAADF-STEM)imaging,and theoretical calculations,it is elucidated that this peak-splitting structure results from thermodynamically induced structural distortions and atomic *** introduction of the ionically conductive medium promotes the formation of Ag-O-Mn conductive bond bridges,which regulate the energy level matching of manganese oxides and oxygen *** thermodynamically induced structural distortion ex-poses new atomic planes in the material,and the creation of this highly active surface is accompanied by a redistribution of surface charges,which modulates the adsorption of manganese active sites with oxy-gen intermediates and greatly enhances the oxygen reduction ***,this Ag-OMS-2 with a novel split structure exhibits excellent activity at 0.836 V,superior to Pt/C kinetics and good *** preparation of such highly active structures is instructive for the development of manganese oxides.

关键词： Fuel cells Electrochemistry Manganese Structural distortion Ionically conductive medium

来源：评论

学校读者我要写书评

暂无评论

Bearing Fault Diagnosis Based on Optimized Feature Mode Decomposition and Improved Deep Belief Network

引用

SDHM Structural Durability and Health Monitoring 2024年第4期18卷 445-463页

作者： Jia, Guangfei Meng, Yanchao Qin, Zhiying School of Mechanical Engineering Hebei University of Science and Technology Shijiazhuang050018 China

The vibration signals of rolling bearings exhibit nonlinear and non-stationary characteristics under the influence of noise. In intelligent fault diagnosis, unprocessed signals will lead to weak fault characteristics and low diagnostic accuracy. To solve the above problem, a fault diagnosis method based on parameter optimization feature mode decomposition and improved deep belief networks is proposed. The feature mode decomposition is used to decompose the vibration signals. The parameter adaptation of feature mode decomposition is implemented by improved whale optimization algorithm including Levy flight strategy and adaptive weight. The selection of activation function and parameters is crucial in the application of deep belief networks. The improved deep belief networks are proposed based on Hard swish activation function and the improved whale optimization algorithm. The optimized diagnosis model is applied to weak fault diagnosis of bearings. The experimental results show that this method has faster convergence speed and anti-noise performance under the interference of −5 db noise, and effectively improves the adaptive feature extraction ability of the model and the accuracy of fault diagnosis. Under different conditions, the average accuracy reached 97.8% and 97.6%, with good generalization performance. © 2024 Tech science Press. All rights reserved.

关键词： Mode decomposition

来源：评论

学校读者我要写书评

暂无评论

Time-Varying Formation-Containment Tracking control for Unmanned Aerial Vehicle Swarm Systems with Switching Topologies and a Non-Cooperative Target

引用

Journal of Shanghai Jiaotong university(science) 2024年第4期29卷 689-701页

作者： WU Xiaojing CAO Tongyao ZHEN Ran LI Zhijie School of Electrical Engineering Hebei University of Science and TechnologyShijiazhuang050018China

This paper studies the time-varying formation-containment tracking control problems for unmanned aerial vehicle(UAV)swarm systems with switching topologies and a non-cooperative target,where the UAV swarm systems consist of one tracking-leader,several formation-leaders,and *** formation-leaders are required to accomplish a predefined time-varying formation and track the desired trajectory of the tracking-leader,and the states of the followers should converge to the convex hull spanned by those of the ***,a formation-containment tracking protocol is proposed with the neighboring relative information,and the feasibility condition for formation-containment tracking and the algebraic Riccati equation are ***,the stability of the control system with the designed control protocol is proved by constructing a reasonable Lyapunov ***,the simulation examples are applied to verify the effectiveness of the theoretical *** simulation results show that both the formation tracking error and the containment error are convergent,so the system can complete the formation containment tracking control *** the actual battlefield,combat UAVs need to chase and attack hostile UAVs,but sometimes when multiple UAVs work together for military interception,formationcontainment tracking control will occur.

关键词： formation-containment tracking control switching topology unmanned aerial vehicle(UAV)

来源：评论

学校读者我要写书评

暂无评论

Improving long-term thermal stability in twin-roll cast Al-Mg-Si-Cu alloys by optimizing Mg/Si ratios

引用

材料科学技术（英文版） 2025年第3期206卷 164-175页

作者： Shao-You Zhang Yuan-Ting Mo Zhen-Ming Hua Xu Liu Ze-Tian Liu Hui-Yuan Wang School of Material Science and Engineering Hebei University of TechnologyTianjin 300130PR China Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering Jilin UniversityNanling CampusChangchun 130025PR China International Center of Future Science Jilin UniversityChangchun 130012PR China School of Material Science and Engineering Hebei University of TechnologyTianjin 300130PR China School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051PR China School of Material Science and Engineering Hebei University of TechnologyTianjin 300130PR China Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering Jilin UniversityNanling CampusChangchun 130025PR China International Center of Future Science Jilin UniversityChangchun 130012PR China

Achieving high thermal stability in the 6xxx series alloys remains a challenging task,which limits their engineering ***,Al-Mg-Si-Cu alloys with various Mg/Si ratios(0.5,1,2,and 4)were fab-ricated by twin-roll casting(TRC),and the microstructure evolution and mechanical properties during long-term thermal exposure of 150 ℃/1000 h were *** results disclosed that alloys with a high Mg/Si ratio exhibited better thermal *** alloys with the Mg/Si ratio of 2(Mg/Si～2)achieved a stable high yield strength of～330 MPa and meanwhile maintained a satisfactory fracture elongation(＞10％)throughout the thermal exposure *** excellent thermal stability can be attributed to the microstructure consisting of high-density L phases and fine α-AlFeSi phases,which was related to the optimized Mg/Si ***,L phases were dominated in peak-aged Mg/Si～2 alloys,while the counterparts in alloys with the Mg/Si ratio of 1(Mg/Si～1)were β"and Q'*** the thermal exposure process,the L phases remained stable without coarsening,which was mainly due to the high coherence and low interfacial energy of the L-matrix ***,the main Fe-containing phases in Mg/Si～2 and Mg/Si～1 alloys were fine near-spheroidal α-AlFeSi and large-size needle-like β-AlFeSi,re-spectively,which lead to a better ductility of Mg/Si～2 *** work may provide a strategy for the preparation of 6xxx series alloys with high thermal stability.

关键词： Aluminum alloy Twin-roll casting Thermal stability Microstructure evolution Mechanical properties

来源：评论

学校读者我要写书评

暂无评论

High strength and high work hardening rate in oxygen gradient Ti-15Mo alloy

引用

Journal of Materials science & technology 2024年第31期198卷 56-62页

作者： Zhixin Wang Kai Yao Binkai Du Suyun He Xiaohua Min Shewei Xin Shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China Northwest Institute for Non-Ferrous Metal Research Xi'an 710016China

The low work hardening is a prominent deficiency for high-strength titanium(Ti)*** gradient design of oxygen content was adopted to realize the coupling deformation of{332}twinning and dislocation slip in the Ti-15Mo ... 详细信息

The low work hardening is a prominent deficiency for high-strength titanium(Ti)*** gradient design of oxygen content was adopted to realize the coupling deformation of{332}<113>twinning and dislocation slip in the Ti-15Mo *** oxygen gradient alloy exhibited an optimal balance of yield/tensile strength(700 and 848 MPa)and elongation(25%),with remarkable work hardening *** dominated dislocation slip deformation and the solution strengthening of oxygen atoms in the oxygen-rich region resulted in a remarkable increase in yield *** successive formation of{332}<113>twins and piled-up geometrically necessary dislocations around the twin boundaries in the oxygen-free region induced remarkable back stress strengthening,maintaining the high work hardening rate,which resulted in a stable increase in *** twins and dislocations formed at the crack tips effectively hindered the cracking behavior,avoiding premature *** present study provides a novel idea for designing oxygen layer-distributed Ti alloys,which further improves the strength-ductility tradeoff.

关键词： Titanium alloys Oxygen gradient Work hardening Heterogeneous material Ductility

来源：评论

学校读者我要写书评

暂无评论

Application of deep learning in iron ore sintering process:a review

引用

Journal of Iron and Steel Research International 2024年第5期31卷 1033-1049页

作者： Yu-han Gong Chong-hao Wang Jie Li Muhammad Nasiruddin Mahyuddin Mohamad Tarmizi Abu Seman School of Electrical and Electronic Engineering Universiti Sains Malaysia14300 Nibong TebalPenangMalaysia College of Electrical Engineering North China University of Science and TechnologyTangshan 063210HebeiChina Technology Transfer Center North China University of Science and TechnologyTangshan 063210HebeiChina School of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210HebeiChina

In the wake of the era of big data,the techniques of deep learning have become an essential research direction in the machine learning field and are beginning to be applied in the steel *** sintering process is an extremely complex industrial *** the main process of the blast furnace ironmaking industry,it has great economic value and environmental protection significance for iron and steel *** is also one of the fields where deep learning is still in the exploration *** order to explore the application prospects of deep learning techniques in iron ore sintering,a comprehensive summary and conclusion of deep learning models for intelligent sintering were presented after reviewing the sintering process and deep learning models in a large number of research ***,the mechanisms and characteristics of parameters in sintering processes were introduced and analysed in detail,and then,the development of iron ore sintering simulation techniques was ***,deep learning techniques were introduced,including commonly used models of deep learning and their ***,the current status of applications of various types of deep learning models in sintering processes was elaborated in detail from the aspects of prediction,controlling,and optimisation of key *** speaking,deep learning models that could be more effectively implemented in more situations of the sintering and even steel industry chain will promote the intelligent development of the metallurgical industry.

关键词： Deep learning Sintering process Modelling Simulation technology Intelligent sintering

来源：评论

学校读者我要写书评

暂无评论

Model-free control of Permanent Magnet Synchronous Linear Motor Based on Ultra-local Model

引用

Chinese Journal of Electrical engineering 2024年第4期10卷 73-82页

作者： Guangjing Su Hongmei Li Zheng Li Yanan Zhou School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China School of Electrical Engineering Hebei University of Science and TechnologyShijiazhuang 050018China

A model-free control (MFC) method is proposed to improve the dynamic response performance of permanent magnet synchronous linear motors (PMSLMs) and reduce motor parameter changes during motor operation. The MFC is established based on an ultra-local model that uses only the input and output of the system without using any PMSLM parameters. Compared with the conventional proportional-integral (PI) control method, the robustness of the MFC system is superior and can counteract the effects of changing motor parameters and external disturbances. Simulations and experiments are conducted with steady-state operation, sudden addition and subtraction of loads, and motor parameter perturbations. The results confirm that the proposed method is useful and robust to uncertainties in motor parameters and helps improve the dynamic performance of the PMSLM.

关键词： Model-free control permanent magnet synchronous linear motor(PMSLM) ultra-local model current control

来源：评论

学校读者我要写书评

暂无评论

Progress and challenges of electrolyte modulation in aqueous zinc-ion batteries

引用

Rare Metals 2024年第7期43卷 2940-2967页

作者： Qi-Hang Yang Lu-Fei Wang Xiao-Yu Wang Meng-Meng Zhen Tianjin Key Laboratory of Clean Energy and Pollution Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin 300071China

As a new type of green battery system,aqueous zinc-ion batteries(AZIBs)have gradually become a research hotspot due to their low cost,high safety,excellent stability,high theoretical capacity(820 mAh·g^(-1))of zinc anode,and low redox potential(-0.76 V *** hydrogen electrode(SHE)).AZIBs have been expected to be an alternative to lithium-ion batteries for large-scale commercial energy storage ***,they are facing thorny issues such as degradation of cycling performance,zinc dendrites,and side *** the same time,these problems cause short cycling life of batteries,thus severely limiting their commercial *** recent years,many more researches have been conducted on the modification of anode and cathode materials of AZIBs,but there is a lack of in-depth discussion on the characteristics and mechanism of electrolyte *** this review,we will make a systematic summary of the current problems with two electrodes in AZIBs,as well as the types and functions of electrolyte ***,we further systematically describe the modulation mechanism of electrolyte additives in the performance of the cathode and *** prospects and development directions of additive modulation strategies for AZIBs electrolytes are prospected.

关键词： Electrolyte additives Aqueous zinc-ion batteries Zinc anode protection Cathode chemistry

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：