检索结果-内蒙古大学图书馆

2022 International Conference on Electronic Information technology, EIT 2022

作者： Chen, Hepu Wu, Huaming Zhang, Yechao Xiao, Wenbo Xiao, Yongsheng Huang, Lizhen Zeng, Jie Natl. Eng. Lab. for Non-Destructive Testing and Optoelectronic Sensing Technology and Applications Ministry of Education Nanchang330063 China Jiangxi Engineering Laboratory for Optoelectronics Testing Technology School of Measuring and Optical Engineering Nanchang Hangkong University Nanchang330063 China School of Information Engineering Nanchang Hangkong University Nanchang330063 China State Key Laboratory of Mechanical Structure Mechanics and Control Nanjing University of Aeronautics and Astronautics Nanjing210016 China

ISBN: (纸本)9781510655096

Aiming at the problem that Distributed Optical Fiber Acoustic Sensing (DAS) system will misjudge external intrusion signals, an intrusion signal discrimination method based on MFCC-Energy entropy feature and FTO-SVM is proposed. Firstly, the former 13-dimensional Mel-Frequency Cepstral Coefficients (MFCC) is extracted from the collected sound signal, and Principal Component Analysis (PCA) is used to reduce the dimension of MFCC;Secondly, the energy entropy of the collected sound signal is calculated, which fused with the reduced MFCC as the feature parameter of the collected sound signal;Finally, the extracted feature parameters are discriminated by using Support Vector Machine (SVM) with the hyperparameters optimized by the Fibonacci Tree Optimization (FTO) algorithm. The results show that the proposed method can effectively improve the system discrimination accuracy for intrusion signals, and is of great significance to perimeter security and fault diagnosis and other related fields. © 2022 SPIE.

关键词： Support vector machines

来源：评论

学校读者我要写书评

暂无评论

Effect of ball-milling solvent on the structure and lithium storage performance of Fe2SiO4/C nanocomposite

引用

Materials Research Innovations 2021年第6期25卷 342-347页

作者： Wang, Xiaomei Zhang, Lina Ma, Yanhui Zhang, Qingtang State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals School of Petrochemical Engineering Lanzhou University of Technology Lanzhou China Gansu Jingpu Testing Technology Co. Ltd Department of Battery Assembly and Testing LanzhouGansua China

Ethanol, deionised water and their mixture were used as the ball-milling solvents to prepare Fe2SiO4/C nanocomposites via solid-state reactions from ferrous oxalate, nano silica and ammonium citrate. The three Fe2SiO4/C nanocomposites are orderly designated as FS/C-E, FS/C-W and FS/C-M and exhibit different structure. XRD results indicate that all three Fe2SiO4/C nanocomposites are fayalite crystal phase and FS/C-M has developed (111) lattice planes. SEM results further indicate that FS/C-M has the smallest particle size among the three Fe2SiO4/C nanocomposites. TEM also results indicate that Fe2SiO4 nanoparticles are evenly dispersed the carbon networks of FS/C-M. These unique structure ensure FS/C-M deliver a high charge capacity of 718.3 mAh/g at 0.1 C, high rate performance (391.6 mAh/g at 5 C) and good cycling performance (707.4 mAh/g at 1 C after 200 cycles). © 2020 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Nanocomposites

来源：评论

学校读者我要写书评

暂无评论

Quantitative study on surface crack of 304 austenitic stainless steel under natural magnetic field

Quantitative study on surface crack of 304 austenitic stainl...

引用

2020 IEEE Far East Forum on nondestructive Evaluation/testing: New technology and Application, FENDT 2020

作者： Fu, Ping Hu, Bo Yu, Jia-Lin Lan, Xi-Wang Key Laboratory of Non-destructive Testing of Ministry of Education Nanchang Hangkong University Nanchang China

ISBN: (纸本)9781665440820

Cracks are common defects in stainless steel which often lead to serious industrial accidents. In this paper, magnetic detection without external excitation was proposed. Quantitative defect identification was performed using multiclass classification support vector machine. The magnetic signals of 304 austenitic stainless steel were collected before and after annealing. The width, amplitude and area of magnetic signals were extracted as the input set of support vector machine model, and the prediction accuracy of cracks were compared and analyzed. The results showed that the prediction accuracy of length, width and depth of cracks are 80.70%, 92.71% and 65.63%, respectively. The width and depth of defects are increased by 5.89% and 33.34% respectively. This research provides a potential possibility for quantitative defect identification for nonferromagnetic materials under the natural magnetic field. © 2020 IEEE.

关键词： Support vector machines

来源：评论

学校读者我要写书评

暂无评论

Compressive and Flexural Properties and Damage Modes of Aluminum Foam/Epoxy Resin Interpenetrating Phase Composites Reinforced by Silica Powder

SSRN

引用

SSRN 2024年

作者： Su, Mingming Zhou, Zhiming Wang, Han Non-destructive Testing Laboratory School of Quality and Technical Supervision Hebei University Baoding071002 China National and Local Joint Engineering Research Center of Metrology Instrument and System Hebei University Baoding071002 China Hebei Key Laboratory of Energy Metering and Safety Testing Technology Hebei University Baoding071002 China State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi'an Jiaotong University Xi’an710049 China

Interpenetrating phase composites (IPCs) were prepared by connecting open-cell aluminum foam (AF) and epoxy resin (EP) in three-dimensional space. Silica powder was added to epoxy resin to improve the compressive and three-point bending properties of IPCs. In the bending test, acoustic emission (AE) was applied to track the bending deformation of the samples, and k-means clustering algorithm was applied to identify the damage modes. When the content of silica powder was 100 wt.%, the compressive and bending properties of IPCs were the highest. The X-type shear band and EP/AF debonding appeared in compression failures of AF and IPCs, respectively. The AE clustering results showed that under bending load, AF contained plastic deformation of matrix and fracture failure modes, while IPCs included plastic deformation of foam matrix, EP/AF debonding and EP failure modes. © 2024, The Authors. All rights reserved.

关键词： Epoxy resins

来源：评论

学校读者我要写书评

暂无评论

Influence of steam heat transfer tube damage characteristics on burst pressure 2

Influence of steam heat transfer tube damage characteristics...

引用

2020 2nd International Academic Exchange Conference on Science and technology Innovation, IAECST 2020

作者： Peng, Zhizhen Ren, Shangkun Suzhou Nuclear Power Research Institute Co. Ltd. Suzhou Jiangsu215000 China Key Laboratory of Non-destructive Testing Ministry of Education Nanchang Hangkong University Nanchang330063 China

The corrosion damage and leakage of heat transfer tube of steam generator were important factors of nuclear power accident, which is closely related to the national nuclear power production safety and people's life and property. The influence of the size change of cylindrical defect on burst pressure of inconel690 alloy heat transfer tube was studied by finite element simulation and experimental measurement. According to the simulation and test data, the relationship between burst pressure and damage parameter is established. The results show that for cylindrical defects with small depth, there is an extreme point of cylinder damage diameter b which makes the damage maximum, which makes the burst pressure at a minimum. The research results can provide reference for accurate evaluation of residual life of heat transfer tubes. © 2021 EDP Sciences. All rights reserved.

关键词： Steam generators

来源：评论

学校读者我要写书评

暂无评论

Analysis of Coronado State Historic Site Artifacts using X-rays

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 136-137页

作者： Patterson, Brian M. Young, Steven G. Valdez, James Espy, Michelle Edgar, Alex Brett, Jack Pettes, Michael T. Mathers, Clay Barbour, Matthew Engineered Materials Group Materials Science and Technology Division Los Alamos National Laboratory Los Alamos NM United States Materials Science in Radiation and Dynamics Extremes Group Materials Science and Technology Division Los Alamos National Laboratory Los Alamos NM United States Non-destructive Testing and Evaluation Group Engineering Technology and Design Division Los Alamos National Laboratory United States Center for Integrated Nanotechnologies Materials Physics and Applications Division Los Alamos National Laboratory Los Alamos NM United States Archaeological Analysis and Graphics Albuquerque NM United States New Mexico State Historic Sites Santa Fe NM USA

来源：评论

学校读者我要写书评

暂无评论

Scattering Correction of CBCT Images Based on Dual Encoding U-Net and Discrete Wavelet Transform

引用

Guangxue Xuebao/Acta Optica Sinica 2025年第9期45卷

作者： Yan, Ting He, Chaoliang Tong, Qian Zhu, Songtao Duan, Xiaojiao Key Laboratory of Optoelectronic Technology & Systems Ministry of Education Chongqing University Chongqing400044 China Industrial CT Non-Destructive Testing Engineering Research Center Ministry of Education Chongqing University Chongqing400044 China

Objective Cone-beam computed tomography (CBCT) has been widely used in various fields such as industrial measurement, security inspection, and medical imaging. However, during the CT scanning process, the Compton effect inevitably leads to issues in CT images, including scatter artifacts, reduced image contrast, and information loss. Compared with other types of scanning methods, CBCT has a larger cone angle and detector area, which allows it to receive more scattered photons, thus being more severely affected by scatter. As a result, effective methods need to be adopted to perform scatter correction on CBCT images, restore image quality, and improve the accuracy of clinical diagnosis. Methods To achieve CBCT scatter correction, we design a novel dual-encoder network model, DEU-Net. DEU-Net is composed of a densely connected convolutional neural network (DCCNN) module and a Swin transformer (Swin-T) module. These two modules are utilized to extract local and global features of the image and combine them to achieve preliminary image correction in the image domain. Based on the low-frequency characteristics of scatter, the DEU-Net model is combined with a two-dimensional discrete wavelet transform. Scatter information is extracted in the projection domain to achieve final scatter correction. A weighted loss function is designed to ensure that the model training process focuses more on the parts of the image with complex structures and large errors, thereby obtaining better correction results. Results and Discussions The feasibility and effectiveness of this method are verified using the MC dataset, which is composed of pelvic data and high- and low-dose data. The comparison results before and after correction are shown in Fig. 5. The proposed method is compared with other deep learning-based methods, and the results are presented in Fig. 6, with the indicator data shown in Table 1. It is evident from the results that, compared with other correction methods, the method

关键词： Photointerpretation

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Hydrogen-Induced Degradation of Steel Through Multispectral Analysis of Magnetic Barkhausen Noise

Evaluation of Hydrogen-Induced Degradation of Steel Through ...

引用

Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Grzegorz Psuj Cesar G. Camerini Michal Maciusowicz Gabriela R. Pereira Center for Electromagnetic Fields Engineering and High-Frequency Techniques Faculty of Electrical Engineering West Pomeranian University of Technology Szczecin Poland Department of Metallurgical and Materials Engineering Laboratory of Non-Destructive Testing Corrosion and Welding Federal University of Rio de Janeiro Rio de Janeiro RJ Brazil

ISBN: (数字)9798350362213

ISBN: (纸本)9798350362220

This paper presents the evaluation of hydrogen degradation in AISI 4340 steel based on the multispectral analysis of magnetic Barkhausen noise. Previous studies using acoustic and magnetic response of the Barkhausen effect have shown a large change in the course of the phenomenon as a result of the progression of hydrogen destruction of steel, and the applied time-frequency analysis has been limited to aggregated data in a few frequency bands. Thus, due to the complex nature of changes in the Barkhausen noise course, this study uses the analysis of the multi-domain representation of the measured signals, enabling a broad characterization of various aspect of obtained signal distributions by multiple feature assessment.

关键词： Degradation Time-frequency analysis Noise Hydrogen Magnetoacoustic effects Magnetic noise Acoustics

来源：评论

学校读者我要写书评

暂无评论

Comparative analysis of single-and multiple-frequency thermal wave radar imaging inspection of glass fiber reinforced polymer(GFRP)

引用

International Journal of Extreme Manufacturing 2022年第2期4卷 161-172页

作者： Lishuai Liu Andreas Mandelis Alexander Melnikov Liming Wang Key Laboratory of Pressure Systems and Safety of MOE School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237People’s Republic of China Center for Advanced Diffusion-Wave and Photoacoustic Technologies(CADIPT) Department of Mechanical and Industrial EngineeringUniversity of TorontoTorontoON M5S 3G8Canada Institute for Advanced Non-Destructive and Non-Invasive Diagnostic Technologies(IANDIT) TorontoONM5S 3G8Canada Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055People’s Republic of China

Active infrared thermography has gained increasing popularity for nondestructive testing and evaluation in various industrial fields,especially for composite *** this regard,thermal wave radar(TWR)imaging is recognized as the next-generation active thermography technology to obtain great resolution and depth range over the inspected objects.A critical aspect concerns the optimal test parameter selection to guarantee reliable quality assurance required for industrial *** this work,single-and multiple-frequency TWR was investigated in a quantitative manner with the goal of optimizing the detection parameters in terms of probing range and lateral and depth *** effects of test parameters,including sampling frequency,modulation frequency,chirp duration,chirp bandwidth,etc,were investigated in detail through experiments on a glass fiber reinforced polymer specimen with multi-scale diameter-to-depth ratio *** paper aims to help yield a better understanding of the physical mechanism behind TWR and propose a workable scheme for testing parameter selection in practical applications.

关键词： GFRP thermal wave radar testing parameters nondestructive testing

来源：评论

学校读者我要写书评

暂无评论

Preparation of CaSn(OH)6 Deposition on Calcium Zincate Surface and Application in Zinc‒Nickel Secondary Battery

引用

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society 2023年第4期51卷 1025-1033页

作者： Qin, Wei Yu, Xiaohua Yu, Shuanglin Zhang, Wenzhi Wu, Zhanxin Shen, Qingfen Xie, Gang Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology Kunming650093 China Baise Quality Inspection and Testing Institute Guangxi Baise533002 China State Key Laboratory of Common Associated Non-ferrous Metal Resources Pressure Hydrometallurgy Technology Kunming650503 China

In order to improve the serious polarization problem of zinc negative electrode in zinc–nickel secondary batteries and to improve the electrochemical performance and cycling stability of zinc negative electrode, a hydrothermal‒coprecipitation method was used to prepare CaSn(OH)6 deposited on the surface of calcium zincate and used as a negative active substance of zinc‒nickel batteries. The results show that the hydrothermal‒coprecipitation method can be used to deposit CaSn(OH)6 on the surface of calcium zincate, and the prepared calcium zincate has a high crystallinity. Based on the cyclic voltammetry test, the addition of CaSn(OH)6 reduces the charge transfer resistance of calcium zincate and is beneficial to accelerating the electrochemical reaction rate of calcium zincate in alkaline electrolyte, thus improving the discharge rate in the reaction process. The results of electrochemical impedance spectroscopy confirm that calcium zincate with CaSn(OH)6 deposited on the surface electrode charge transfers impedance less rather than that of pure calcium zincate. The capacity retention rate of the battery is 85.34% after 70 charge discharge cycles at 0.2 C when calcium zincate with CaSn(OH)6 deposited on the surface is used as a negative active material of Zn–Ni battery. © 2023 Chinese Ceramic Society. All rights reserved.

关键词： Tin compounds

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：