检索结果-内蒙古大学图书馆

Failure analysis of 3D woven composites under tension based on realistic model

Chinese Journal of Aeronautics 2024年第11期37卷 242-253页

作者： Binbin ZHANG Guangchang CHEN Bing WANG Jingran GE Mengran LI Zengfei LIU Jun LIANG Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China China Helicopter Research and Development Institute Jingdezhen 333001China Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150001China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Beijing 100081China

The failure behavior of the three-dimensional(3D)woven composites under tension are evaluated via experimentation and *** accurately depict the intricate geometry of the woven composites,including the fluctuation of yarn paths,variations in cross-section,and resin distribution,the image-aided digital elements modeling approach is ***,to further assess both the tensile performance and damage response,a realistic voxel model is established with the integration of a well-suited progressive damage *** obtained stress-strain curves align with the experimental results,and damage progression and underlying mechanisms involved are clearly ***,when subjected to warp tension,severe transverse damage and fiber bundle pull-out towards the warp yarns are observed within the curved ***,under weft loading,longitudinal damage is found to occur in the weft yarns,while the warp yarns suffer from transverse damage,leading to the formation of a smooth and brittle ***,the findings of this study hold potential to advance the engineering applications of the3D woven composites.

关键词： Mechanical properties Failure analysis Woven composites Realistic model Digital element methodology

来源：评论

学校读者我要写书评

暂无评论

Fabrication of Wafer-Bonded 2D CMUT Array with Glass-Filled Trenches 38

Fabrication of Wafer-Bonded 2D CMUT Array with Glass-Filled ...

引用

38th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2025

作者： Oh, Chaerin Park, Seyoung Park, Jongcheol Jung, Joontaek Lee, Hyunjoo J. Korea Advanced Institute of Science and Technology School of Electrical Engineering Korea Republic of National NanoFab Center Center for Next-Generation Platform Development Korea Republic of

ISBN: (纸本)9798331508890

Precise modulation of the focused beam is a critical technology for improving the performance of ultrasound-based treatments and diagnostics. Beyond conventional 1D transducer arrays, 2D transducer arrays have significantly broadened the scope of beam control applications. Leveraging CMOS compatibility, capacitive micromachined ultrasonic transducers (CMUT) have been regarded as an effective approach to fabricating 2D transducer arrays in a compact form. Although wafer-bonded CMUT arrays demonstrate excellent performance, their complex structures, including through-substrate vias and the need for mechanical stability, have posed significant challenges for 2D arrays. To address these challenges, we propose a novel method to enhance mechanical stability by employing a glass-reflow technique to fill the trench. © 2025 IEEE.

关键词： Wafer bonding

来源：评论

学校读者我要写书评

暂无评论

Microstructures,corrosion behavior and mechanical properties of as-cast Mg-6Zn-2X(Fe/Cu/Ni)alloys for plugging tool applications

引用

International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 697-711页

作者： Baosheng Liu Jiali Wei Shaohua Zhang Yuezhong Zhang Pengpeng Wu Daqing Fang Guorui Ma School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Intelligent Equipment Research and Development Center Zhuhai Institute of Advanced Technology Chinese Academy of SciencesZhuhai 519080China Advanced Materials Research Institute Zhuhai Dingmei Medical Technology Co.Ltd.Zhuhai 519000China

Mg-6Zn-2X(Fe/Cu/Ni)alloys were prepared through semi-continuous casting,with the aim of identifying a degradable magnesium(Mg)alloy suitable for use in fracturing balls.A comparative analysis was conducted to assess the impacts of adding Cu and Ni,which result in finer grains and the formation of galvanic corrosion *** electronic microscopy examination revealed that precipitated phases concentrated at grain boundaries,forming a semi-continuous network structure that facilitated corrosion penetration in Mg-6Zn-2Cu and Mg-6Zn-2Ni *** corrosion was observed in Mg-6Zn-2Fe,while galvanic corrosion was identified as the primary mechanism in Mg-6Zn-2Cu and Mg-6Zn-2Ni *** the tests,the Mg-6Zn-2Ni alloy exhibited the highest corrosion rate(approximately 932.9 mm/a)due to its significant potential *** testing showed that Mg-6Zn-2Ni alloy possessed suitable ultimate compressive strength,making it a potential candidate material for degradable fracturing balls,effectively addressing the challenges of balancing strength and degradation rate in fracturing applications.

关键词： magnesium alloys microstructure micro-galvanic corrosion mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Japanese-To-english simultaneous dubbing prototype 61

Japanese-To-english simultaneous dubbing prototype

引用

61st Annual Meeting of the Association for Computational Linguistics, ACL-DEMO 2023

作者： Wang, Xiaolin Utiyama, Masao Sumita, Eiichiro Advanced Translation Research and Development Promotion Center National Institute of Information and Communications Technology Japan

ISBN: (纸本)9781959429708

Live video streaming has become an important form of communication such as virtual conferences. However, for cross-language communication in live video streaming, reading subtitles degrades the viewing experience. To address this problem, our simultaneous dubbing prototype translates and replaces the original speech of a live video stream in a simultaneous manner. Tests on a collection of 90 public videos show that our system achieves a low average latency of 11.90 seconds for smooth playback. Our method is general and can be extended to other language pairs. © ACL-DEMO 2023. All rights reserved.

关键词： Video streaming

来源：评论

学校读者我要写书评

暂无评论

Classification of Medical Image Notes for Image Labeling by Using MinBERT

引用

Tsinghua Science and technology 2023年第4期28卷 613-627页

作者： Bokai Yang Yujie Yang Qi Li Denan Lin Ye Li Jing Zheng Yunpeng Cai Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Shenzhen Health Development Research and Data Management Center Shenzhen 518055China

The lack of labeled image data poses a serious challenge to the application of artificial intelligence(AI)in medical image *** image notes contain valuable patient information that could be used to label images for machine learning ***,most image note texts are unstructured with heterogeneity and short-paragraph characters,which fail traditional keyword-based *** utilized a deep learning approach to recover missing labels for medical image notes automatically by using a combination of deep word embedding and deep neural network *** encoder representations from transformers trained on medical image notes corpus(MinBERT)were *** applied the proposed techniques to two typical classification tasks:Medical image type identification and clinical diagnosis *** two methods significantly outperformed baseline methods and presented high accuracies of 99.56%and 99.72%in image type identification and of 94.56%and 92.45%in clinical diagnosis *** analysis further indicated that word embedding could efficiently capture semantic similarities and regularities across diverse *** indicated that our proposed framework could accurately recover the missing label information of medical images through the automatic extraction of electronic medical record ***,it could serve as a powerful tool for exploring useful training data in various medical AI applications.

关键词： MinBERT convolutional neural network electronic medical record medical image labeling word embedding

来源：评论

学校读者我要写书评

暂无评论

MXene based flexible microheater for enhanced infrared imaging of cerebral blood flow

引用

Progress in Natural Science:Materials International 2024年第5期34卷 1021-1028页

作者： Qinli Ye Jinghui Lin Guoxiang Wang Shuwen Zeng Tao Jiang Xiang Gao Muhammad Danang Birowosuto Wei Xiong Chenjie Gu The Research Institute of Advanced Technology Ningbo University Department of Neurosurgery The First Affiliate Hospital of Ningbo University Light Nanomaterials & Nanotechnologies (L2n) CNRS-UMR 7004 Université de Technologie de Troyes ?ukasiewicz Research Network-PORT Polish Center for Technology Development Ningbo Institute of Oceanography

Infrared thermography technology is a noninvasiveness and real-time imaging method, it has attracted enormous attentions for blood flow imaging. However, the implementation of infrared thermography technology is still limited by the poor imaging quality caused by the low temperature discrimination between the target blood vessel and background. Herein, we reported a flexible and low-cost MXene based photothermal microheater for enhancing the infrared imaging of blood flow. In the experiment, MXene films with specific thickness was prepared by vacuum filtering different concentrations of MXene colloidal solutions. Thereafter, the microheaters were fabricated by assembling the MXene films on the PU tape/PDMS substrate, and then sealed with another layer of pure PDMS film on the top of MXene film. The photothermal performance of the microheaters were evaluated by using an 808-nm laser as the exciting source. Experimental results show that the optimal microheater（MXene content: 17.5 mg） can reach a safe temperature of 41.5°C with 43.9 s under the light irradiation of100 mW·cm-2. Moreover, it can be stabilized at the equilibrium temperate for over 25 min. Finally, the above optimal microheater was used to accurately heat the simulated blood vessel. It shows that temperature difference of 3.3°C can be induced between the heated blood vessel and environment. As a result, it significantly enhances the quality of the infrared imaging of the blood flow in the simulated vascular network.

关键词： MXene nanosheets Microheater Infrared imaging Blood flow

来源：评论

学校读者我要写书评

暂无评论

Interfacial B-O bonding modulated S-scheme B-doped N-deficient C_(3)N_(4)/O-doped-C_(3)N_(5) for efficient photocatalytic overall water splitting

引用

Chinese Chemical Letters 2025年第1期36卷 355-361页

作者： Entian Cui Yulian Lu Zhaoxia Li Zhilei Chen Chengyan Ge Jizhou Jiang Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China School of Environmental Ecology and Biological Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China

Photocatalytic overall pure water splitting is a promising method for generating green hydrogen energy under mild ***,this process is often hindered by sluggish electron-hole separation and *** address this,a step-scheme(S-scheme)B-doped N-deficient C_(3)N_(4)/O-doped C_(3)N_(5)(BN-C_(3)N_(4)/O-C_(3)N_(5))heterojunction with interfacial B-O bonds has been *** Pt and Co(OH)_(2) as co-catalysts,BN-C_(3)N_(4)/O-C_(3)N_(5) S-scheme heterojunction demonstrates significantly enhanced photocatalytic activity for overall pure water splitting under visible light,achieving H_(2) and O_(2) evolution rates of 40.12 and 19.62μmol/h,*** characterizations and experiments revealed the performance-enhancing effects of the enhanced built-in electric field and the interfacial B-O ***,the strengthened built-in electric field provides sufficient force for rapid interfacial electron ***,by reducing the transport energy barrier and transfer distance,the interfacial B-O bonds facilitate rapid recombination of electrons and holes with relatively low redox potential via the S-scheme charge-transfer route,leaving the high-potential electrons and holes available for H^(+)reduction and OH^(-)oxidation ***,the photocatalytic efficiency of BN-C_(3)N_(4)/O-C_(3)N_(5) S-scheme heterojunction was significantly improved,making it a promising approach for green hydrogen production through overall pure water splitting.

关键词： Interfacial B-O bonds BN-C_(3)N_(4) O-C_(3)N_(5) S-scheme heterojunction Water splitting

来源：评论

学校读者我要写书评

暂无评论

Ablation resistance of ZrC coating modified by polymer-derived SiHfOC ceramic microspheres at ultrahigh temperature

引用

Journal of Materials Science & technology 2024年第15期182卷 119-131页

作者： Xuemeng Zhang Yuyu Zhang Lingxiang Guo Bing Liu Yuqi Wang Hongbin Li Hejun Li Jia Sun Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China China Aerodynamics Research and Development Center Mianyang 621000China Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense TechnologyChangsha 410073China

Polymer-derived ceramics(PDCs)method opens up new possibilities for the preparation of novel multi-phase ceramic nanocomposites owing to the molecular design of the precursors at the nanoscale *** the current work,ZrC coatings incorporated with polymer-derived ceramic microspheres(CMS),SiH-fOC_CMS,were deposited to enhance the ablation resistance by supersonic atmosphere plasma *** 10.0 MW·m^(-2) plasma ablation at above 3000℃,the linear ablation rate of ZrC-SiHfOC_CMS coat-ing was reduced to 0.20μm·s^(-1),62%lower than that of the pristine ZrC *** improvement was ascribed to the presentence of viscous SiO_(2)/HfO_(2) molten mixed phase,rather than HfSiO4,which can ef-fectively seal pinholes and ***,the in-situ generated crystalline SiO_(2) had a lower oxygen diffusion rate than amorphous SiO_(2),meanwhile,m-HfO_(2) could improve the stability of SiO_(2) glassy film,thus further enhancing the ablation resistance.

关键词： ZrC Polymer-derived ceramics(PDCs) Carbon/Carbon composites Plasma spraying Plasma ablation

来源：评论

学校读者我要写书评

暂无评论

Wheel Speed Identification and Longitudinal Vehicle Speed Estimation for Four-Wheel Drive Vehicles 8

Wheel Speed Identification and Longitudinal Vehicle Speed Es...

引用

8th CAA International Conference on Vehicular Control and Intelligence, CVCI 2024

作者： Wu, Dongmei Liu, Zixuan Yan, Taowei Zhang, Pei Wuhan University of Technology Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan China Dongfeng Motor Corporation Dongfeng Research and Development Center Passenger Vehicle Platform Center Wuhan China

ISBN: (纸本)9798331504892

To address the issue of vehicle speed estimation, particularly at low speeds, applicable to various environmental conditions, especially in the absence of driven wheels for vehicles equipped with four-wheel drive systems, a rule-based wheel speed identification and vehicle speed estimation method is proposed. This technique leverages wheel speed sensors and longitudinal acceleration sensors for vehicles to enhance the precision of wheel speed identification at low speeds and enhance the adaptability of vehicle speed estimation under different conditions. Firstly, to tackle the problem of no wheel speed pulse signal passing within one sampling period at low speeds, estimation is achieved through time accumulation, enabling effective wheel speed identification for both high and low-speed. Furthermore, utilizing the Kalman filtering algorithm and Butterworth filter, the wheel speed and wheel acceleration are filtered separately to reduce signal fluctuations caused by noise interference, thereby providing reliable input signals for estimating vehicle speed. Building upon this, A method for estimating vehicle speed based on the gradient constraint approach is proposed, taking into account the sequential relationships of each wheel speed and the longitudinal acceleration signal. Finally, real vehicle tests under different conditions demonstrate that the proposed vehicle speed estimation technique achieves high estimation accuracy, meeting the vehicle's speed estimation requirements under various environmental factors. © 2024 IEEE.

关键词： Butterworth filters

来源：评论

学校读者我要写书评

暂无评论

Performance Analysis of Resource Allocation Algorithms for Vehicle Platoons over 5G eV2X Communication 17

Performance Analysis of Resource Allocation Algorithms for V...

引用

17th International Conference on COMmunication Systems and NETworkS, COMSNETS 2025

作者： Mandal, Gulabi Roy, Anik Palit, Basabdatta Indian Institute of Technology Department of Computer Science and Engineering Kharagpur India Indian Institute of Technology Advanced Technology Development Center Kharagpur India National Institute of Technology Department of Electronics and Communication Engineering Rourkela India

ISBN: (纸本)9798331531195

Vehicle platooning is a cooperative driving technology that can be supported by 5G enhanced Vehicle-to-Everything (eV2X) communication to improve road safety, traffic efficiency, and reduce fuel consumption. eV2X communication among the platoon vehicles involves the periodic transmission of Cooperative Awareness Messages (CAMs) containing vehicle information under strict latency and reliability requirements. These requirements can be maintained by administering the assignment of resources, in terms of time slots and frequency bands, for CAM transmission in a platoon, with the help of a resource allocation mechanism. State-of-the-art on control and communication design for vehicle platoons either consider a simplified platoon model with a detailed communication architecture or consider a simplified communication delay model with a detailed platoon control system. Departing from existing works, we have developed a comprehensive vehicle platoon communication and control framework using OMNET + +, the benchmarking network simulation tool. We have carried out an inclusive and comparative study of three different platoon Information Flow Topologies (IFTs), namely Car-to-Server, Multi-Hop, and One-Hop over 5G using the Predecessor-Leader Following platoon control law to arrive at the best-suited IFT for platooning. Secondly, for the best-suited 5G eV2X IFT, we have analyzed the performance of three different resource allocation algorithms, namely Maximum of Carrier to Interference Ratio (MaxC/I), Proportional Fair (PF), and Deficit Round Robin (DRR). Exhaustive system-level simulations show that the One-Hop information flow strategy along with the MaxC/I resource allocation yields the best Quality of Service (QoS) performance, in terms of latency, reliability, Age of Information (AoI), and throughput. © 2025 IEEE.

关键词： Vehicle to vehicle communications

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：