检索结果-内蒙古大学图书馆

16th International Conference on Ubiquitous Robots (UR)

作者： Matsushita, Yume Miki, Kenta Imazaike, Takuya Yamazoe, Hirotake Lee, Joo-Ho National Key Laboratory of Science & Technology on Test Physics & Numerical Mathematics Beijing China

ISBN: (纸本)9781728132327

Falls are one of the reasons why older people need to receive care. Walking training is effective for preventing older people from falling. Accordingly, various research related to walking training has been conducted. We aimed to introduce robots in walking training of older people, and we developed a walking-promotion robot. In this paper, we designed motions for promoting walking by older people and evaluated the effects on the participants motivation to walk and the impression of the robot conveyed by the robots motions. From the experimental results, we confirmed that a robot did affect the participants motivation to walk.

关键词： Legged locomotion Acceleration Robot motion Task analysis Training Turning"

来源：评论

学校读者我要写书评

暂无评论

Double-stage Metamodel and Its Application in Aerodynamic Design Optimization

引用

Chinese Journal of Aeronautics 2011年第5期24卷 568-576页

作者： ZHANG Dehu GAO Zhenghong HUANG Likeng WANG Mingliang National Key Laboratory of Science and Technology on Aerodynamic Design and Research Northwestern Polytechnical University Xi＇an 710072 China National Key Laboratory of Science and Technology on Test Physics ＆ Numerical Mathematical Beijing 100076 China

Constructing metamodel with global high-fidelity in design space is significant in engineering design. In this paper, a double-stage metamodel （DSM） which integrates advantages of both interpolation metamodel and regression metamodel is constructed. It takes regression model as the first stage to fit overall distribution of the original model, and then interpolation model of regression model approximation error is used as the second stage to improve accuracy. Under the same conditions and with the same samples, DSM expresses higher fidelity and represents physical characteristics of original model better. Besides, in order to validate DSM characteristics, three examples including Ackley function, airfoil aerodynamic analysis and wing aerodynamic analysis are investigated, In the end, airfoil and wing aerodynamic design optimizations using genetic algorithm are presented to verify the engineering applicability of DSM.

关键词： optimization genetic algorithm double-stage metamodel Kriging BP neural network Latin hypercube Parsecmethod

来源：评论

学校读者我要写书评

暂无评论

Regulation of Shock Response in Cage-Like High-Energy-Density Materials: Competition between Strain Energy and Structural Symmetry

SSRN

引用

SSRN 2025年

作者： Song, Qingguan Meng, Li Jiang, Shengli Zhang, Lei Mo, Zeyao Institute of Applied Physics and Computational Mathematics Beijing100088 China CAEP Software Center for High Performance Numerical Simulation Beijing100088 China Institute of Chemical Materials China Academy of Engineering Physics Mianyang621999 China School of Materials Science & Engineering Beijing Institute of Technology Beijing100081 China State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing100081 China

The cage-like structures provide a unique combination of strain energy for enhanced energy storage and hyperstatic constraints to stabilize the system, positioning them as promising pioneers in advancing high-energy-density materials (HEDMs). However, the shock response of cage-like HEDMs is highly complex and exhibits significant variability, posing a grand challenge in the underlying mechanisms. This study reveals that the shock response of cage-like HEDMs is regulated by the interplay between strain energy and structural symmetry, and introduces a physical model to quantitatively describe how they determine shock stability. The investigated systems include a comprehensive series of cage-like polynitrocubane HEDMs, with each carbon atom in the backbone progressively functionalized with nitro groups. Ab initio molecular dynamics (AIMD) simulations were employed to simulate dynamic and kinetic responses at shock velocities ranging from 8 km/s to 11 km/s, with validation provided by consistent Hugoniot curves that align with reported experimental data. Nitro substituents at the carbon-based cage structure, recognized as explosion functional groups, were found to substantially increase the system's strain energy. However, an increasing number of nitro substituents also intensified electrostatic repulsion among oxygen lone pairs, which weakens structural integrity and renders the material more susceptible to disassembly under shock conditions. Conversely, structural symmetry—including both the cage-like molecular conformation and spatial packing within the crystal lattice—was found to mitigate these destabilizing effects, effectively balancing the trade-off between energy storage and structural stability. Based on these findings, we propose a physical model that captures the essential factors driving shock initiation in cage-like HEDMs, offering new insights to inform the design and application of novel advanced HEDMs. © 2025, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The Changes in Heating and Cooling Energy Demand in Beijing and Shanghai under Global Warming

引用

Journal of Applied Meteorology and Climatology 2025年第5期64卷 413-424页

作者： Xu, Yan Si, Dong Cao, Lei Yu, Yu Wu, Xueyuan Chen, Sining National Meteorological Information Centre China Meteorological Administration Beijing China National Key Laboratory of Earth System Numerical Modeling and Application Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Nanjing China Chinese Academy of Meteorological Sciences China Meteorological Administration Beijing China

Climate change significantly influences electricity and energy demand, yet a comprehensive understanding of heating and cooling energy demand in China’s major cities under the impact of global warming remains incomplete. This study utilized monthly electricity consumption and mean air temperature data to accurately determine the base temperatures for Beijing and Shanghai, identified as 18.948 and 19.548C, respectively. We further established the heating degree-day (HDD) and cooling degree-day (CDD) indices for both cities over the period from 1961 to 2020. The results indicate a declining trend in winter heating demand and an increasing trend in summer cooling energy demand in both Beijing and Shanghai from 1961 to 2020. Notably, the decrease in winter heating demand exceeds the increase in summer cooling demand for each city. The findings indicate a higher sensitivity of electricity demand to temperature in Beijing during summer (13.5519 TWh 8C21) compared to winter (21.5706 TWh 8C21). Similarly, in Shanghai, temperature sensitivity is higher in summer (15.1133 TWh 8C21) than in winter (21.7133 TWh 8C21). This high sensitivity during the summer months implies an overall increase in future energy demand. While Beijing demonstrates a higher demand for winter heating compared to Shanghai, its demand for summer cooling is comparatively lower. Nevertheless, due to Shanghai’s greater sensitivity of electricity demand to temperature compared to Beijing, it is projected that Shanghai’s total energy demand will exceed that of Beijing in the future. © 2025 American Meteorological Society.

关键词： Electric power utilization

来源：评论

学校读者我要写书评

暂无评论

Polarization effect on molecular ionization and Rydberg-state excitation in laser fields

引用

Optics Express 2025年第10期33卷 21796-21806页

作者： Hu, Shilin Yi, Xiaopeng Guo, Li Li, Pengcheng Chen, Jing Research Center for Advanced Optics and Photoelectronics Department of Physics College of Science Shantou University Guangdong Shantou 515063 China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou University Guangdong Shantou 515063 China Institute of Applied Physics and Computational Mathematics P.O. Box 8009 Beijing 100088 China Department of Physics Shanghai Normal University Shanghai 200234 China Department of Modern Physics Hefei National Research Center for Physical Sciences School of Physical Sciences University of Science and Technology of China Hefei 230026 China Hefei National Laboratory Hefei 230088 China

We have studied the impact of the dynamic core-electron polarization on molecular ionization and Rydberg-state excitation for CO molecules subjected to different laser pulses by numerically solving the three-dimensional time-dependent Schrödinger equations (TDSE) and semiclassical simulations. It is found that the ionization and the Rydberg-state excitation prefer to occur for the peak electric field pointing from C nucleus to O nucleus if the multielectron polarization effect is included, which are consistent with previous experimental observations. In addition, the electron tends to occupy the low-lying excited states after the occurrence of tunneling and the excitation yield increases relatively with respect to the ionization probability if the polarization effect is considered, and the above intriguing features are ascribed to the facts that the tunneling exit becomes closer to the core due to the polarization effect. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Harmonic generation Interference Ionization Lasers numerical simulation Polarization

来源：评论

学校读者我要写书评

暂无评论

Automatic MHT Method Based on Target Characteristics Applied in the Small Space Targets 3

Automatic MHT Method Based on Target Characteristics Applied...

引用

3rd International Conference on Design, Mechanical and Material Engineering, D2ME 2018

作者： Zhao, Qian Niu, Zhenhong Xue, Lian Liu, Xin Li, Jianhua Li, Zhifeng National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics China

The Multi-Hypothesis Tracking (MHT) method is one of the most promising approaches to realize automatic tracking of small and dim targets in complex space scene. However, the number of hypotheses generated by this algorithm has an exponentially increasing relationship with the number of trajectories, measurement data, and the number of image frames. In the paper, the automatic detection and tracking method of judging the confidence coefficient of the trajectory obtained by the MHT which is based on the characteristics of dim targets, has been realized in the IRST system. The performance of this method is greatly improved. © 2018 The Authors, published by EDP sciences.

关键词： Target tracking

来源：评论

学校读者我要写书评

暂无评论

The Design of Large Arc-shape High-precision Walking Device in TV (thermal-vacuum) Conditions 3

The Design of Large Arc-shape High-precision Walking Device ...

引用

3rd International Conference on Design, Mechanical and Material Engineering, D2ME 2018

作者： Lian, Xue Hua, Nan Jiaqi, Liu Xin, Liu Gang, Meng National Key Laboratory of Science Technology on Test Physics and Numerical Mathematics China

The large-sized space environmental simulation test facility is mainly used for providing thermal radiation environment in high-vacuum, cold and dark space for satellites, spacecraft, lunar spacecraft to carry out whole satellite thermal vacuum test and for large equipment like antenna to carry out tests in TV conditions. Monitoring the spacecraft's surface optical image or temperature is a main task in space environment simulation test. In previous tests, optical image test mainly took place in a fixed position, so the measuring location and angle are limited. This paper focuses on large spherical space environmental simulation test facility, and designs a large arc-shape high-precision walking device in a space environment simulation test device. It introduces key technology in detail like structure design, thermal design, processes and manufacturing, etc. The test results show that this device can work steadily and reliably under simulation space environments, and the precision exceeds 0.5°. © 2018 The Authors, published by EDP sciences.

关键词： Design

来源：评论

学校读者我要写书评

暂无评论

Nonlinear control algorithm for smooth transition in large-angle attitude maneuver

Nonlinear control algorithm for smooth transition in large-a...

引用

2011 International Conference on Recent Advancements in Electrical, Electronics and Control Engineering, IConRAEeCE'11

作者： Du, Runle Liu, Jiaqi Wang, Yonghai Meng, Gang Mu, Chenyang National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics China

ISBN: (纸本)9781457721472

Large-angle attitude maneuver is common during the mission of spacecrafts, such as aligning to star to calibrate navigation system. Published works on attitude tracking always focus on optimizing the time and fuel cost, neglecting the smoothness requirement and angular speed limitations. In this paper, a nonlinear control algorithm is prompted for smooth transition in large-angle attitude maneuver. A nonlinear filter is added to the attitude feedback control loop, to carry out angular speed control in large-angle maneuvers. Simulation results demonstrated the effectiveness and reliability of proposed approach. © 2011 IEEE.

关键词： Navigation systems

来源：评论

学校读者我要写书评

暂无评论

numerical simulation and analysis of lithium plasma during low-pressure DC arc discharge

引用

Plasma science and technology 2019年第4期21卷 16-21页

作者： Runhui WU Song CHAI Jiaqi LIU Shiyuan CONG Gang MENG National Key Laboratory of Science and Technology on Test Physics&Numerical Mathematics Beijing 100076People's Republic of China School of Physics Dalian University of TechnologyDalian 116024People's Republic of China

Alkali metal DC arc discharge has the characteristics of easy ionization,low power consumption,high plasma temperature and ionization degree,etc,which can be applied in aerospace vehicles in various *** this paper,we calculate the physical property parameters of lithium vapor,one of the major alkali metals,and analyze the discharge characteristics of lithium plasma with the magnetohydrodynamic(MHD)*** discharge effects between constant current and voltage sources are also *** is shown that the lithium plasma of DC arc discharge has relatively high temperature and current *** peak temperature can reach tens of thousands of K,and the current density reaches 6 x 107 A m *** the same rated power,the plasma parameters of the constant voltage source discharge are much higher than those of the constant current source discharge,which can be used as the preferred discharge mode for aerospace applications.

关键词： DC discharge lithium plasma numerical simulation low-pressure arc

来源：评论

学校读者我要写书评

暂无评论

A Neural Network Architecture Based on Attention Gate Mechanism for 3D Magnetotelluric Forward Modeling

arXiv

引用

arXiv 2025年

作者： Zhong, Xin Lin, Weiwei Pan, Kejia Wu, Pinxia Zhang, Jiajing Zhan, Zhiliang Xiao, Wenbo School of information engineering Jiangxi University of Science and Technology Ganzhou341000 China Jiangxi College of Applied Technology Ganzhou341000 China Key Laboratory of Ionic Rare Earth Resources and Environment Ministry of Natural Resources Ganzhou341000 China Hunan Shaofeng Institute for Applied Mathematics Xiangtan411105 China School of Mathematics and Statistics HNP-LAMA Central South University Changsha410083 China National Key Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing100088 China School of science Jiangxi University of Science and Technology Jiangxi Ganzhou341000 China

—Traditional three-dimensional magnetotelluric (MT) numerical forward modeling methods, such as the finite element method (FEM) and finite volume method (FVM), suffer from high computational costs and low efficiency due to limitations in mesh refinement and computational resources. We propose a novel neural network architecture named MTAGU-Net, which integrates an attention gating mechanism for 3D MT forward modeling. Specifically, a dual-path attention gating module is designed based on forward response data images and embedded in the skip connections between the encoder and decoder. This module enables the fusion of critical anomaly information from shallow feature maps during the decoding of deep feature maps, significantly enhancing the network’s capability to extract features from anomalous regions. Furthermore, we introduce a synthetic model generation method utilizing 3D Gaussian random field (GRF), which accurately replicates the electrical structures of real-world geological scenarios with high fidelity. numerical experiments demonstrate that MTAGU-Net outperforms conventional 3D U-Net in terms of convergence stability and prediction accuracy, with the structural similarity index (SSIM) of the forward response data consistently exceeding 0.98. Moreover, the network can accurately predict forward response data on previously unseen datasets models, demonstrating its strong generalization ability and validating the feasibility and effectiveness of this method in practical applications. Copyright © 2025, The Authors. All rights reserved.

关键词： Decoding

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：