检索结果-内蒙古大学图书馆

4th IEEE International Conference on Electronics and Communication Engineering, ICECE 2021

作者： Xue, Junjie Zhou, Junhua Shi, Guoqiang Feng, Chaoqun Liu, Penghua Quan, Hongyan Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center Beijing China State Key Laboratory of Intelligent Manufacturing System Technology Beijing China Institute of Electronic System Engineering Beijing China Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center Beijing China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center Beijing China School of Computer Science and Technology East China Normal University Shanghai China

ISBN: (纸本)9781728194226

In order to make full use of the concept of model-based systems engineering (MBSE) and the collaborative design capability of the open model-based engineering environment (OpenMBEE) in establishing complex product development platform, we propose an effective method to solve the problem of unified identity authentication in OpenMBEE integration. The proposed method is based on the Model View Controller(MVC) architecture in OpenMBEE, which has the characteristics strong plasticity and can be benefit for expanding the function in the controller layer. In our research, we make full use of the Software Development Kit (SDK) of OpenMBEE to expand the existing functions in the controller layer, and increase the function of communicating with the application development platform, then realize the function of sharing user authentication information between the development platform and OpenMBEE. After expansion, the system includes three modules, including the Front-end Service Module(FSM), MQ based Information Receiving Service Module(IFRSM), and the OpenMBEE Back-end Server Module(BSM). The effectiveness of the proposed strategies is verified by some practical instances, which verifies that our study can provide an effective design idea for the identity authentication in OpenMBEE integration. ©2021 IEEE

关键词： Integration

来源：评论

学校读者我要写书评

暂无评论

Radar signal recognition based on deep residual network with attention mechanism 4

Radar signal recognition based on deep residual network with...

引用

4th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2021

作者： Jin, Xiaolin Ma, Jing Ye, Fang College of Infomation and Communication Engineering Harbin Engineering University Harbin150001 China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information Technology Beijing100854 China Science and Technology on Special System Simulation Laboratory Beijing100854 China

ISBN: (纸本)9781665432030

To address the problem of poor recognition success rate (RSR) of low probability of intercept (LPI) radar signals such as polyphase codes at low signal-to-noise ratio (SNR), In this paper, we propose a method of deep neural network with attention mechanism for modulation recognition of radar signals. The method first transforms the received radar signal into a two-dimensional time-frequency image(TFI), and then we obtain a binary time-frequency image by threshold segmentation，and resize TFIs through bicubic interpolation. While a deep residual network with Convolutional Block Attention Module (CBAM) is designed to recognize the radar signals. We take advantage of the attention mechanism to find the effective feature information in the noise and increase the effective information weight to further improve the recognition success rate of radar signals under low SNR. Finally, the average RSR of the method is nearly 96% for 7 signals at -6dB. © 2021 IEEE

关键词： Deep neural networks

来源：评论

学校读者我要写书评

暂无评论

CMAS + sea salt corrosion to thermal barrier coatings

引用

Corrosion science 2023年第1期218卷

作者： Guo, Lei Zhang, Xinmu Liu, Mingguang Yang, Shuo Dai, JianWei School of Materials Science and Engineering Tianjin University Tianjin300072 China Tianjin Key Laboratory of Advanced Joining Technology Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin300072 China Naval Logistics Academy Tianjin300450 China Center for analysis and Test Tianjin University 300072 China Key laboratory for advanced corrosion and protection of aviation materials AECC Beijing Institute of Aeronautical Materials Beijing100095 China

In marine environment, sea salt and calcium-magnesium-alumina-silicate (CMAS) coexist largely endangering thermal barrier coatings (TBCs) service safety. In this study, the corrosion behavior of synthetic sea salt and CMAS to TBCs was investigated. Sea salt changed the CMAS structure, thereby decreasing its melting temperature and high-temperature viscosity. At 1200 ℃, CMAS + sea salt completely melted but CMAS did not;at 1250 ℃, both melted while CMAS + sea salt had stronger penetration ability in TBCs than CMAS. Thus, TBCs which have not been or are less affected by CMAS may be damaged due to CMAS + sea salt attack. © 2023 Elsevier Ltd

关键词： Alumina

来源：评论

学校读者我要写书评

暂无评论

Enhancing particle heat resistance of the silicon-oxygen network skeleton in silica aerogel via Y/Yb dual-doping for thermal insulation

引用

Ceramics International 2025年

作者： Wu, Sijia Yu, Yuxi Luo, Zhong Huang, Liuying Fu, Zhongyi Zhao, Shuyuan College of Materials Xiamen University Xiamen361005 China China Aviation Power Machinery Research Institute Zhuzhou412002 China College of Naval Architecture & Ocean Engineering Naval University of Engineering Wuhan430033 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

SiO2 aerogels are nanoporous thermal insulation materials composed of a network of interconnected nanoparticles, but they are easy to crack and collapse above 800 °C which resulting in failure of thermal insulation. To improve the temperature resistance of nanoparticles, rare earth elements yttrium (Y) and ytterbium (Yb) were introduced as an enhancement system by sol-gel method to change the chemical interaction on the chemical structure and molecular bonding, together with improving the thermal stability. TEOS as the silicon source, yttrium nitrate and ytterbium nitrate as the rare earth sources, aerogel material with a density of 0.0904 g/cm3 was prepared by adjusting the finally chosen molar ratio of Si:Y:Yb = 1:0.05:0.05. By investigating the influence of RE on the microstructure, Y and Yb were found to be involved in the molecular bonding forming Si-O-Y and Si-O-Yb and changing the surface of primary particles. The thermal stability showed that the phase transition process after 573 °C was greatly inhibited by the introduction of single or dual RE. By analyzing the high temperature microstructural evolution, the shrinkage was decreased 25 % when at 1200 °C. The Cristobalite phase above 1200 °C was inhibited due to the Y/Yb dual-doping system. Furthermore, the decomposition stability was enhanced and the crack formation was significantly reduced at 1000 °C with thermal conductivity reducing from 0.2111W/(m·K) to 0.1187 W/(m·K) after heat treatment at 1000 °C. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Sol-gel process

来源：评论

学校读者我要写书评

暂无评论

Microstructure Evolution and Mechanical Properties of a Novel High-Strength Ti2alnb Alloy Processed by Large-Strain Hot Extrusion

SSRN

引用

SSRN 2022年

作者： Liu, Shishuang Cao, Jingxia Zhou, Yi Hou, Chenrui Dai, Shenglong Huang, Xu Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical Materials Beijing100095 China

The microstructure evolution and tensile behavior of a novel Ti2AlNb alloy (Ti-22Al-23Nb-1Mo-1Zr) processed by two-pass hot extrusion and two-step heat treatment were investigated. After extruding deformation in the B2 phase field, the B2 grains were refined from about 1500 μm to 50 μm through dynamic recrystallization. The microstructures subjected to solution treatment in the B2+α2 phase field and aging treatment in the B2+O phase field include B2 matrix, lamellar O, rim O and lamellar α2/O phases. The microstructure and tensile properties are sensitive to aging temperature. As the increase of the aging temperature, the content of the B2 phase and the size of the lamellar O phase increase, resulting in low strength and high ductility. The alloy aged at 800 oC has a good match of strength and ductility. It has an elongation of 6.4 % with a tensile strength as high as 1228 MPa due to the precipitation strengthening of numerous lamellar O phase and fine grain strengthening. The tensile fracture mode predominantly shows quasi-cleavage characteristics with typical cleavage facets and massive dimples, which is consistent with the good balance of tensile strength and ductility. An in-depth understanding of the relationship between microstructure and tensile properties in this study can be helpful for the engineering application of the Ti2AlNb alloy. © 2022, The Authors. All rights reserved.

关键词： Tensile strength

来源：评论

学校读者我要写书评

暂无评论

Angular Deviation and Influential Factors of Burgers Orientation Relationship During Β→Α Transformation in Titanium Alloys

SSRN

引用

SSRN 2023年

作者： Li, Mingbing Wang, Kai Wang, Bin Lv, Chao Wang, Xinnan Li, Xing Zhu, Zhishou Hou, Huilong Zhao, Xinqing School of Materials Science and Engineering Beihang University Beijing100191 China Key Laboratory of Advanced Titanium Alloys Beijing Institute of Aeronautical Materials Aero Engine Corporation of China Beijing100095 China MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Nanjing University of Science and Technology Nanjing210094 China Tianmushan Laboratory Zhejiang Provincial Laboratory for Aviation Hangzhou311312 China

The Burgers orientation relationship commonly observed during β→α transformation in titanium alloys exhibits an angular deviation in crystallographic orientation. Determining the possible angular deviations and governing factors is of great importance for controlling the microstructure and properties of alloys. Herein, we propose a calculation method to determine the angular deviations, Δθ, from the ideal Burgers orientation relationship. The calculated results show that the angular deviations exist between the β and α phases in α colonies for Ti-6Al-4V and Ti-6.5Al-2Zr-1Mo-1V alloys. The angular deviations originate from the lattice distortions by the dislocations in the α phase and β phase and their interfaces. Our work indicates that a tolerance angle could be used to determine whether the α phase and β phase obey the Burgers orientation relationship in polycrystalline titanium alloys. The proposed method offers an approach to quantify the variations of the Burgers orientation relationship and develops the understanding of crystallographic evolutions. © 2023, The Authors. All rights reserved.

关键词： Titanium alloys

来源：评论

学校读者我要写书评

暂无评论

Active control of thermoacoustic instability in a lean-premixed hydrogen-enriched combustor via open-loop acoustic forcing

引用

Combustion and Flame 2025年 277卷

作者： Liao, Yu Choi, Yongseok Liu, Peijin Kim, Kyu Tae Guan, Yu Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic University Kowloon Hong Kong National Key Laboratory of Solid Rocket Propulsion Northwestern Polytechnical University Xi'an710072 China Department of Aerospace Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

Open-loop control is proven effective in mitigating self-excited oscillations in conventional hydrocarbon-fueled combustors, but its effectiveness in hydrogen-fueled combustors remains unknown. This study experimentally investigates the effectiveness of open-loop acoustic forcing in mitigating self-excited periodic thermoacoustic oscillations in a lean-premixed, hydrogen-enriched turbulent combustor. We conducted experiments across a range of hydrogen volume fractions (20% to 50%), varying both the frequencies and amplitudes of the acoustic forcing introduced via three loudspeakers positioned upstream of the combustor. For the first time, we have demonstrated the effectiveness of open-loop acoustic forcing in mitigating self-excited periodic thermoacoustic oscillations in a hydrogen-enriched combustor, with suppression effects becoming more pronounced as the hydrogen content increases. We achieve up to a 90% reduction in pressure amplitude with minimal energy input—less than 1% of the combustor's thermal power. At lower hydrogen fractions, the acoustic forcing fails to effectively decouple the flame dynamics from the acoustic field, resulting in significant oscillation amplification, with natural mode amplitudes increasing by over 2000%. A critical transition from global amplification to suppression occurs at a hydrogen volume fraction of 40%, where successful decoupling between the flame dynamics from the acoustic field is observed. These findings highlight the potential of open-loop control for mitigating thermoacoustic oscillations in hydrogen-enriched combustion systems, offering a promising approach to aid the decarbonization of gas turbines. Novelty and significance statement This study provides the first experimental evidence that open-loop acoustic forcing can effectively suppress thermoacoustic oscillations in hydrogen-enriched turbulent combustors. We show that increasing hydrogen volume fraction (20% to 50%) in the reactant mixtures enhances oscillation s

关键词： Combustors

来源：评论

学校读者我要写书评

暂无评论

Omitted variable bias in single-pollutant epidemiological models for estimating long-term health effects of ambient fine particulate matter and ozone

引用

Journal of Hazardous Materials 2025年 494卷 138590页

作者： Xue, Tao Deng, Jianyu Ni, Xueqiu Kang, Ning Tong, Mingkun Li, Pengfei School of Public Health Peking University Health Science Centre Beijing100191 China Advanced Institute of Information Technology Peking University Hangzhou311215 China State Key Joint Laboratory of Environment Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing100871 China Institute of Medical Technology Peking University Health Science Centre Beijing100191 China

Long-term exposure to PM2.5 and O3 is linked to various adverse health outcomes. However, many epidemiological studies on their health effects use single-pollutant models, leading to omitted variable bias (OVB). The percent bias, based on the classical OVB formula, depends on the PM2.5-O3 correlation and unobservable true effects. Data were sourced from two recent meta-analyses of the log-linear link between all-cause mortality and per-unit exposure to PM2.5 or O3. We then developed a new meta-regression method to correct biases, and its performance was verified through simulation. The OVB for PM2.5 or O3 can vary greatly from positive to negative across different spatial scales (like country, sub-national region, or city). By applying this method to 24 individual estimates, we found that a 10 μg/m³ increase in PM2.5 was linked to a 7.4 % increase in all-cause mortality risk, while O3’s association with all-cause mortality was not significant, which implies that PM2.5 must be considered in epidemiological analyses to obtain reliable effect estimates for O3. Our findings offer novel methodologies for the systematic assessment of the health effects of multiple pollutants. This contribution holds significant potential in fortifying health intervention strategies and minimizing the health risks posed by air pollution to the public. © 2025 Elsevier B.V.

关键词： Air quality

来源：评论

学校读者我要写书评

暂无评论

Towards Three-dimensional Mapping of Skyrmionic Spin Textures in an FeGe Nanodisk Using Off-axis Electron Holography

引用

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1396-1397页

作者： Zheng, Fengshan Caron, Jan Savchenko, Andrii S. Wang, Shasha Wang, Weiwei Denneulin, Thibaud Kovács, András Du, Hongchu Du, Haifeng Kiselev, Nikolai S. Blügel, Stefan Dunin-Borkowski, Rafal E. Electron Microscopy Center School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and Devices Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials South China University of Technology Guangzhou China Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute Forschungszentrum Jülich Jülich Germany Peter Grünberg Institute and Institute for Advanced Simulation Forschungszentrum Jülich and JARA Jülich Germany Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei Anhui China Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information Technology Anhui University Hefei China

来源：评论

学校读者我要写书评

暂无评论

核子电磁形状因子振荡行为的新视角

引用

science Bulletin 2023年第22期68卷 2729-2733,M0005页

作者：杨勤鹤郭棣戴凌云 Johann Haidenbauer 康现伟 Ulf-GMeiner School of Physics and Electronics Hunan UniversityChangsha 410082China Hunan Provincial Key Laboratory of High-Energy Scale Physics and Applications Hunan UniversityChangsha 410082China Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron PhysicsForschungszentrum JülichJülich D-52425Germany Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Helmholtz Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics Universität BonnBonn D-53115Germany Tbilisi State University Tbilisi 0186Georgia

本文研究了质子和中子的类时电磁形状因子.作者基于手征有效场论,通过求解李普曼-施温格方程得到了核子-反核子对散射振幅.以此为输入,利用扭曲波恩近似方法描述了核子末态相互作用,计算了正负电子湮灭到正反核子对的过程.通过拟合相移... 详细信息

本文研究了质子和中子的类时电磁形状因子.作者基于手征有效场论,通过求解李普曼-施温格方程得到了核子-反核子对散射振幅.以此为输入,利用扭曲波恩近似方法描述了核子末态相互作用,计算了正负电子湮灭到正反核子对的过程.通过拟合相移、截面以及微分截面等实验数据,定下了有效场论的未知耦合常数.进一步研究发现,可以利用两个分数振荡振子来描述核子电磁类时形状因子的振荡行为:一个表现为过阻尼振荡,在阈值附近占主导地位;另一个类似于欠阻尼振荡,在高能区起到重要作用.这种振荡行为对理解硬光子诱导的核子内部极化电荷的分布起着至关重要的作用.

关键词： Electromagnetic form factors Fractional oscillator Chiral effective field theory Lippmann-Schwinger equation Distorted wave Born approximation

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：