检索结果-内蒙古大学图书馆

In-situ construction of abundant active centers on hierarchically porous carbon electrode toward high-performance phosphate electrosorption: Synergistic effect of electric field and capture sites

引用

Green Energy & Environment 2024年第1期9卷 126-137页

作者： Peng Zhang Fukuan Li Mingming He Silu Huo Xueli Zhang Benqiang Cen Dezhi Fang Kexun Li Hao Wang College of Environmental Science and Engineering Nankai UniversityTianjin300350China MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution ControlTianjin Key Laboratory of Environmental Technology for Complex Trans-Media PollutionNankai UniversityTianjin300350China State Key Laboratory of Simulation and Regulation of Water Cycles in River Basins China Institute of Water Resources and Hydropower ResearchBeijing100038China

Phosphate removal is crucial for eutrophication control and water quality ***-assisted adsorption,an eco-friendly elec-trosorption process,exhibited a promising potential for wastewater ***,there are few works focused on phosphate electro-sorption,and reported electrodes cannot attach satisfactory removal capacities and ***,electro-assisted adsorption of phosphate via in-situ construction of La active centers on hierarchically porous carbon(LaPC)has been originally *** resulted LaPC composite not only possessed a hierarchically porous structure with uniformly dispersed La active sites,but also provided good conductivity for interfacial electron *** LaPC electrode achieved an ultrahigh phosphate electrosorption capability of 462.01 mg g^(-1) at 1 V,outperforming most existing *** superior phosphate removal performance originates from abundant active centers formed by the coupling of electricﬁeld and capture ***,the stability and selectivity toward phosphate capture were maintained well even under comprehensive ***,a series of kinetics and isotherms models were employed to validate the electrosorption *** work demonstrates a deep understanding and promotes a new level of phosphate electrosorption.

关键词： Electro-assisted adsorption Electrosorption Phosphate removal Active centers MOF-derived carbon

来源：评论

学校读者我要写书评

暂无评论

Internal Ballistic Optimization Design Based on Improved Particle Swarm Optimization Title 2nd

Internal Ballistic Optimization Design Based on Improved Par...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhang, Bowen Wang, Guoping Zhao, Xin Institute of Launching Dynamic Nanjing University of Science and Technology Nanjing210094 China Key Laboratory of MIIT System Dynamics of Complex Equipment Nanjing University of Science and Technology Nanjing210094 China

ISBN: (纸本)9789819980475

In order to optimize the interior ballistic parameters of artillery, an improved particle swarm optimization method for interior ballistic parameters is proposed by improving the learning factor, inertia weight coefficient and introducing simulated annealing. By adopting linear asynchronous change strategy to the learning factor, the weight coefficient of non-linear change is constructed, which reduces the parameter sensitivity of the optimization model and speeds up the convergence speed. Meanwhile, the Metropolis rule is applied to avoid the drawbacks of traditional particle swarm algorithm easily falling into local optimum. Using the optimization method in this paper, the projectile velocity is increased from 994.15 m/s of the initial scheme to 1016.76 m/s, which shows that the method meets the practical requirements of interior ballistic design engineering and provides a new idea for the optimum design method of barrel weapons. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Simulated annealing

来源：评论

学校读者我要写书评

暂无评论

Outage Analysis of Optimal UAV Cooperation with IRS via Energy Harvesting Enhancement Assisted Computational Offloading

引用

Computer Modeling in Engineering & sciences 2024年第2期138卷 1885-1905页

作者： Baofeng Ji Ying Wang Weixing Wang Shahid Mumtaz Charalampos Tsimenidis School of Information Engineering Henan University of Science and TechnologyLuoyang471000China Research and Innovation Center of Intelligent System Longmen LaboratoryLuoyang471000China State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System(CEMEE) Luoyang471000China Sustainable Digital Communications and Energy Systems(DIGCOM)Group Nottingham Trent UniversityNottinghamUK

The utilization of mobile edge computing(MEC)for unmanned aerial vehicle(UAV)communication presents a viable solution for achieving high reliability and low latency *** study explores the potential of employing intelligent reflective surfaces(IRS)andUAVs as relay nodes to efficiently offload user computing tasks to theMEC server system ***,the user node accesses the primary user spectrum,while adhering to the constraint of satisfying the primary user peak interference ***,the UAV acquires energy without interrupting the primary user’s regular communication by employing two energy harvesting schemes,namely time switching(TS)and power splitting(PS).The selection of the optimal UAV is based on the maximization of the instantaneous signal-to-noise ***,the analytical expression for the outage probability of the system in Rayleigh channels is derived and *** study investigates the impact of various system parameters,including the number of UAVs,peak interference power,TS,and PS factors,on the system’s outage performance through *** proposed system is also compared to two conventional benchmark schemes:the optimal UAV link transmission and the IRS link *** simulation results validate the theoretical derivation and demonstrate the superiority of the proposed scheme over the benchmark schemes.

关键词： Unmanned aerial vehicle(UAV) intelligent reflective surface(IRS) energy harvesting computational offloading outage probability

来源：评论

学校读者我要写书评

暂无评论

Airdrop Landing Rocket Dynamics simulation in Multiple Rocket Storage-Transportation Box 2nd

Airdrop Landing Rocket Dynamics Simulation in Multiple Rocke...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Sun, Yutian Wang, Guoping Zhang, Yu Wang, Youyu Gu, Lilin School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

Traditional land transportation methods are inadequate for coping with the complex terrains encountered during operations. Consequently, the airdrop supply of equipment has been playing an important role in the effective execution of such operations. A geometric model and finite element model of the storage and transportation box-loading platform-airbag landing buffer were established based on the control volume method (CV). Discrete beam element is used in constraint modelling of airdrop equipment. An accurate finite element model of airdrop with binding constraints is established. According to the actual mechanical parameters, the finite element material parameters such as buffer air bag, honeycomb plate and binding rope are accurately described. The simulation conditions are designed according to the requirements of the airdrop test outline, and the impact load of the rocket projectile under the concrete ground condition and the maximum locking force of the directional pipe are calculated, which has a guiding role in the selection of rocket projectile materials and the expansion of the airdrop test. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

A refined prediction model for the initial disturbances of the projectile in the self-propelled gun 4

A refined prediction model for the initial disturbances of t...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Dong, X. Rui, X. Yang, F. Zhang, S. Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Complex Multibody System Nanjing210094 China

In the gun launch process, the continuous propellant combustion provides power and energy for the projectile. Due to the gap between the projectile and barrel, the high-speed motion of the former is generally accompanied by contact and collision with the latter. Meanwhile, the gun also recoils under the propellant gas. Notably, the above complex motion of the system causes the initial disturbances of the projectile and muzzle. Previous launch dynamic models usually neglect the influence of the gun recoil on the combustion and flow in the chamber. However, the gun recoil inevitably further increases the chamber's free space, resulting in the calculation deviations of projectile and muzzle disturbances. The above deviations ultimately determine the firing accuracy and firing stability prediction. To study the in-bore projectile motion and subsequent external ballistic process more accurately, an improved coupled calculation method of launch dynamics is developed. This work combines the interior ballistic two-phase flow dynamics considering the gun recoil, in-bore projectile motion theory, multibody system dynamics, and necessary high-precision numerical schemes. The launch process of the 155 mm self-propelled gun is studied. As the results show, the calculated vibration characteristics, dynamic response, and interior ballistic performance indexes are consistent with measured ones, verifying the feasibility of the above method. In addition, the initial disturbances of the projectile with and without considering the recoil's influence on the combustion and flow in the chamber is discussed. The work in this paper provides an accurate tool to predict the initial disturbances of the projectile. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Ballistics

来源：评论

学校读者我要写书评

暂无评论

Analysis of Vibration Characteristics of Periodic Structure Based on Modal Synthesis Transfer Matrix Method 2nd

Analysis of Vibration Characteristics of Periodic Structure ...

引用

2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Feng, Yu He, Bin Rui, Xiaoting Cui, Jiang Li, Shutian School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

With the continuous improvement of structural lightweight requirements, periodic structures are widely used in beams, plates, shells, and even entities in practical engineering. As an important part of structural design, the analysis of vibration characteristics of periodic structures has attracted much attention from engineering and scientific fields. Based on the transfer matrix method, the periodic structure is divided into multiple identical substructures. The Craig-Bampton modal synthesis method is used to reduce the stiffness matrix and mass matrix of the substructure, and the reduced-order substructure finite element transfer equation and transfer matrix are derived. A new method for efficiently assembling the transfer matrix of periodic structure system is proposed by using the self-similar characteristics of periodic structure. The natural frequency and vibration mode of the system can be obtained by combining the boundary conditions. Giving several numerical examples, the modal synthesis transfer matrix method, Craig-Bampton modal synthesis method and finite element method are used to numerically calculate its vibration characteristics. The results verify the correctness and effectiveness of the modal synthesis transfer matrix method. It shows that the proposed method system matrix order and calculation efficiency are high, which provides a new theoretical and technical support for the vibration characteristics analysis of periodic structures. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Periodic structures

来源：评论

学校读者我要写书评

暂无评论

Terminal Guidance Law Design for Compound Control Missile Based on Time-Delay Control Theory 3rd

Terminal Guidance Law Design for Compound Control Missile Ba...

引用

3rd International Conference on Autonomous Unmanned systems, ICAUS 2023

作者： Zhao, Hui Xu, Cheng Pei, Yuxiao Hu, Ying Institute of Mechanical and Electrical Engineering Beijing100072 China Science and Technology On Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100072 China

ISBN: (纸本)9789819711062

This paper proposes a new terminal guidance law based on zeroing line of sight rate using time delay control theory and back-stepping method. Firstly, the plane guidance model of the compound control missile is established accounting for dynamic characteristics of double actuator, where the unknown interferences such as target maneuver, time-varying relative velocity and parameter perturbation, constitute the system unmatched uncertain parts. Secondly, the guidance law is proposed by introducing the time delay control theory into the solution of terminal guidance, estimating target maneuver and accurate compensation of subsystems at each layer. Then the closed-loop stability of the whole system is demonstrated by giving the basis of parameter selection in the second half of this paper. Finally, the simulation analysis is carried out under the scenario of air targets with large maneuvering. The guidance law can independently estimate target maneuverability, verifying the correctness and effectiveness of combating unknown interfere systems. © Beijing HIWING Scientific and Technological Information Institute 2024.

关键词： Time delay

来源：评论

学校读者我要写书评

暂无评论

Agent Optimization Decision-making Method Based on Self-Play

Agent Optimization Decision-making Method Based on Self-Play

引用

2024 IEEE International Conference on Unmanned systems, ICUS 2024

作者： Duan, Chunyi Xiong, Rongling Zhang, Luyou Ran, Huaming Yang, Qing National Key Laboratory of Complex Aviation System Simulation China Electronics Technology Group Corporation Tenth Research Institute Chengdu China Unit 93216 People's Liberation Army of China Beijing China

ISBN: (纸本)9798350384185

Aiming at the problem that the traditional deep reinforcement learning algorithm has poor generalization ability of generating strategies when solving complex game problems such as real-time strategy games, an agent strategy optimization method based on the combination of expert knowledge and self-play is ***, the opponent strategy of the agent is designed based on expert knowledge, and the corresponding strategy is generated by the proximal policy optimization algorithm (PPO), and the generated strategy is continuously put into the opponent strategy pool to provide a variety of opponent strategies for the agent in the training *** continuous iterative confrontation, the agent's autonomous decision-making ability in the face of different opponent strategies is *** simulation results show that compared with the traditional deep reinforcement learning algorithm, the introduction of the self-play training framework can significantly improve the average confrontation rate of the agent strategy, improve the robustness and generalization ability of the agent confrontation strategy, guide the agent to learn more effective tactical strategy, and achieve the adversarial advantage of "Priority first enemy discovery, Priority enemy launch". © 2024 IEEE.

关键词： Deep reinforcement learning

来源：评论

学校读者我要写书评

暂无评论

Network Security Situation Prediction Based on TCAN-BiGRU Optimized by SSA and IQPSO

引用

Computer systems science & Engineering 2023年第10期47卷 993-1021页

作者： Junfeng Sun Chenghai Li Yafei Song Peng Ni Jian Wang College of Air and Missile Defence Air Force Engineering UniversityXi’an710051China Science and Technology on Complex Aviation Systems Simulation Laboratory Beijing100076China

The accuracy of historical situation values is required for traditional network security situation prediction(NSSP).There are discrepancies in the correlation and weighting of the various network security *** solve these problems,a combined prediction model based on the temporal convolution attention network(TCAN)and bi-directional gate recurrent unit(BiGRU)network is proposed,which is optimized by singular spectrum analysis(SSA)and improved quantum particle swarmoptimization algorithm(IQPSO).This model first decomposes and reconstructs network security situation data into a series of subsequences by SSA to remove the noise from the ***,a prediction model of TCAN-BiGRU is established respectively for each *** uses the TCN to extract features from the network security situation data and the improved channel attention mechanism(CAM)to extract important feature information from *** learns the before-after status of situation data to extract more feature information from sequences for ***,IQPSO is proposed to optimize the hyperparameters of ***,the prediction results of the subsequence are superimposed to obtain the final predicted *** the one hand,IQPSO compares with other optimization algorithms in the experiment,whose performance can find the optimum value of the benchmark function many times,showing that IQPSO performs *** the other hand,the established prediction model compares with the traditional prediction methods through the simulation experiment,whose coefficient of determination is up to 0.999 on both sets,indicating that the combined prediction model established has higher prediction accuracy.

关键词： Network security situation prediction SSA IQPSO TCAN-BiGRU

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation of Flow Boiling Heat Transfer in Helical Tubes Under Marine Conditions 23rd

Numerical Simulation of Flow Boiling Heat Transfer in Helica...

引用

23rd Pacific Basin Nuclear Conference, PBNC 2022

作者： Yuan, Leqi Cheng, Kun Bian, Haozhi Liao, Yaping Jiang, Chenxi Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Heilongjiang Harbin China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu China

ISBN: (纸本)9789819910229

Lead-based cooled reactors in most countries and some small reactors at sea use helical tube steam generators. Compared with U-tubes, the convection heat transfer coefficient in the spiral tube is higher, the structure is more compact, and the secondary flow is generated under the action of centrifugal force and gravity, which can achieve the effect of wetting the inner wall of the tube. However, due to the importance of the steam generator in the reactor and the complexity of the flow and boiling in the helical tube, the aggregation behavior of bubbles, the distribution of the two-phase interface and the secondary flow in the tube will significantly affect the heat transfer characteristics, so the gas-liquid phase in the tube is studied. Distribution, changes in heat transfer coefficients, and fluid flow characteristics are very important. In order to study the boiling heat transfer characteristics of helical once-through steam generators under static and marine conditions to provide safe and reliable energy supply for offshore facilities such as marine floating, this study uses STAR-CCM+ software, VOF method and Rohsenow boiling model to study the heat transfer capacity and flow characteristics of flow boiling in a helical tube under swaying and tilting conditions. The gas-liquid phase distribution characteristics, secondary flow variation characteristics and convective heat transfer coefficient of the fluid under different swing functions and inclined positions are obtained by numerical calculation, and the law of physical parameters changing with the cycle is found. The research results show that the secondary flow and heat transfer capacity in the tube change with the cycle, and the change is most obvious at the tube length of 0.8m. 5% of the normal condition;when the inclination angle is 45°, the maximum increase of the convection heat transfer coefficient is 16.8%, and the maximum decrease is 6.6%. © 2023, The Author(s).

关键词： Computational fluid dynamics

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：