检索结果-内蒙古大学图书馆

Surface roughness classification using light scattering matrix and deep learning

Science China(Technological Sciences) 2024年第2期67卷 520-535页

作者： SUN Hao TAN Wei RUAN YiXiao BAI Long XU JianFeng State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan Digital Design and Manufacturing Innovation Center Co. LtdWuhan 430074China

High-quality optical components have been widely used in various applications;thus,extremely high beam quality is ***,surface roughness is a key indicator of the surface *** this study,the angular distribution of light scattering field intensity was obtained for surfaces having different roughness profiles based on the finite difference time domain(FDTD)method,and the results were compared with those obtained using the generalized Harvey-Shack(GHS)*** was shown that the FDTD approach can be used for an accurate simulation of the scattered field of a rough surface,and the superposition of results obtained from many surfaces that have the same roughness level was in good agreement with the result given by the analytic GHS model.A light scattering matrix(LSM)method was proposed based on the FDTD simulation results that could obtain rich surface roughness *** classification effect of LSM was compared with that of the single-incidence scattering distribution(SISD)based on a ResNet-50 deep learning *** classification accuracy of the model trained with the LSM dataset was obtained as 95.74%,which was 23.40%higher than that trained using the SISD ***,the effects of different noise types and filtering methods on the classification performance were analyzed,and the LSM was also shown to improve the robustness and generalizability of the trained surface roughness ***,the proposed LSM method has important implications for improving the data acquisition scheme of current light scattering measurement systems,and it also has the potential to be used for detection and characterization of surface defects of optical components.

关键词： surface roughness FDTD simulation GHS theory deep learning light scattering matrix

来源：评论

学校读者我要写书评

暂无评论

designing Persuasive technology to Prevent Internet Addiction in Young Children: Promoting Healthy Digital Behavior 19

Designing Persuasive Technology to Prevent Internet Addictio...

引用

19th International Conference on Persuasive technology Adjunct, PERSUASIVE-ADJ 2024

作者： Theopilus, Yansen Center for Design Innovation Swinburne University of Technology Melbourne Australia Center for Ergonomics Parahyangan Catholic University Bandung Indonesia

In this digital age, children are given various online activities from early childhood. Young children are vulnerable to internet addiction due to some personal limitations and influence from the environment (e.g., families and peers). Previous studies reported the high risk and prevalence of internet addiction in young children, especially in developing regions. Given the potential of persuasive technology in supporting health behaviors, its use may be beneficial to preventing internet addiction in children. Therefore, this research aims to investigate, design, and evaluate a persuasive technology intervention to prevent or reduce internet addiction risk in children aged 7–11. My research employs the design thinking framework, co-design approach, and persuasive design principles to achieve the objective. This research is divided into three main phases: 1) understanding the problem space, 2) developing the intervention, and 3) evaluating the intervention. The preliminary findings from the first phase suggest the need to develop an intervention to continuously increase the motivation and capability of children to have healthy internet use and for parents to provide appropriate parental mediation. The proposed intervention will be a digital tool (software) to facilitate and mediate families in shaping healthy digital behavior in children. Potential functions to achieve the objective may include device use management, substitution activity suggestions, competency development to combat addictive behavior, healthy internet use education, and personalized parental mediation decision-making support. © 2024 Copyright for this paper by its authors.

关键词： Digital devices

来源：评论

学校读者我要写书评

暂无评论

Substrate bias effects in p-channel GaN-on-Si transistors

引用

Science China(Information Sciences) 2025年第1期68卷 404-405页

作者： Mengyao ZHAO Jie MA Lanlan YANG Chuanqi PAN Denggui WANG Jianjun ZHOU Sheng LI Jiaxing WEI Long ZHANG Siyang LIU Weifeng SUN National ASIC System Engineering Research Center School of Integrated Circuits Southeast University National Center of Technology Innovation for Electronic Design Automation Southeast University National Key Laboratory of Solid-State Microwave Devices and Circuits

The drain current （ID） of the n-channel GaN field-effecttransistor （n-FET） is influenced by the substrate-to-source bias voltage (VBS)（substrate bias effect）[1].Actually,nonzero VBSis also likely to occur in p-FET in real application,because the source electrode of p-FET is usually connected to high *** study reports the dependency between IDand VBSin p-FET for the first time,and analyzes the underlying mechanisms from the perspective of vertical electric field （EF） distribution.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Holographic Terahertz Imaging for Breast Cancer Detection

引用

Journal of Engineering and Science in Medical Diagnostics and Therapy 2024年第1期7卷 011010页

作者： Wang, Lulu Al-Rawi, Mohammad Biomedical Device Innovation Center Shenzhen Technology University Shenzhen518118 China Centre for Engineering and Industrial Design Waikato Institute of Technology Hamilton3240 New Zealand

Terahertz (THz) imaging is a promising technology that can accurately detect breast tumors during breast-conserving surgery. Researchers have studied THz imaging and spectroscopy techniques to improve breast tumor detection for the past 20 years. This paper presents the recent development of the holographic THz imaging (HTI) method for identifying breast tumors. To evaluate the effectiveness of this new approach, we have developed a numerical system that includes realistic breast models and an imaging processing model. Through various experiments, we have successfully used the proposed holographic THz imaging method to identify breast tumors. Our results have shown that this method can reconstruct high-quality breast images and accurately detect small tumor inclusions, providing the correct size and location information. Based on these promising results, further investigation is warranted to explore the potential of this approach for breast tumor detection in a faster and more cost-effective manner. © 2024 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： Microwave holography

来源：评论

学校读者我要写书评

暂无评论

Comparative study on the hydrogen storage performance of as-milled MgRENi rapid quenched alloy catalyzed by metal sulfides

引用

Journal of Magnesium and Alloys 2024年第5期12卷 2010-2023页

作者： Xiaoping Dong Zhaoqing Zhang Liying Yang Shenghai Xin Dandan Su Zhiyuan Li Department of Mechanical Design and Manufacture and Automation Hebei UniversityBaoding 071000PR China Baoding New Energy Vehicle Power Engineering Technology Research Center Hebei UniversityBaoding 071002PR China Hebei Technology Innovation Center for Lightweight of New Energy Vehicle Power System(Preparation) Hebei UniversityBaoding 071002PR China

The composites of Mg_(20)Pr_(1)Sm_(3)Y_(1)Ni_(10)as-quenched alloy and 3 wt.%M(M=CoS,CoS_(2),MoS_(2))catalyst were prepared by high-speed vibration ball *** effects of metal sulfides on the hydrogenation and dehydrogenation dynamics of alloys were *** results show that the as-milled composites contain a large number of amorphous embedded by a small amount of nanocrystals,and there are many point *** ball milling,the crystal grain size in the composites containing CoS is relatively larger,followed by CoS_(2)and MoS_(2)*** hydrogenation,the amorphous phase is crystallized to form Mg_(2)NiH_(4),YH_(3),Pr_(8)H_(18.96),Sm_(3)H_7,Mg,Co or Mo phases,however,Mg_(2)Ni,YH_(2),PrH_(2)and Ni_(3)Y phases appeared after *** maximum hydrogenation capacity of the composites containing CoS,CoS_(2)and MoS_(2)are 3.939,4.265 and 4.507 wt.%,*** hydrogenation saturation ratio of composite containing MoS_(2)is higher than that of the composites containing CoS and CoS_(2).The dehydrogenation activation energy of the composites containing CoS,CoS_(2)and MoS_(2)is 107.76,68.43 and 63.28 ***^(-1).H_(2).On the improvement of hydrogen storage performance of Mg_(20)Pr_(1)Sm_(3)Y_(1)Ni_(10)alloy,the catalytic effect of MoS_(2)sulfide is better than that of CoS_(2)sulfide,and which is better than CoS sulfide.

关键词： Mg_(20)Pr_(1)Sm_(3)Y_(1)Ni_(10)as-quenched alloy CoS CoS_(2)and MoS_(2)sulfide Milling Activation energy Hydrogen storage dynamics

来源：评论

学校读者我要写书评

暂无评论

Ultrasonic-assisted green synthesis and characterization of nano-hydroxyapatite from Cirrhinus molitorella fish scales bio-waste for biomedical applications

引用

Ceramics International 2025年第15期51卷 20452-20464页

作者： Swamiappan, Sathiskumar Xie, Xin Lu, Chengyu Peng, Xinsheng Dongguan Key Laboratory of Drug Design and Formulation Technology Biomedical Innovation Center Guangdong Provincial Key Laboratory of Research and Development of Natural Drugs and School of Pharmacy Guangdong Medical University Dongguan523808 China

Herein, we demonstrate a facile green procedure to produce natural nano-hydroxyapatite (nHAp) using an ultrasonic-assisted method from Cirrhinus molitorella fish scale bio-waste. Characterization results confirmed the successful preparation of nHAp without any impurities. Further, X-ray diffraction (XRD) peaks matched the hydroxyapatite standard JCPDS 00–009–0432, which also confirmed the hexagonal pattern of nHAp. Fourier-transform infrared (FT-IR) spectroscopy analysis exhibited the existence of phosphate, hydroxyl, and B-type carbonate groups. The energy dispersive X-ray spectroscopy (EDX) was utilized to determine the calcium/phosphorous (Ca/P) molar ratio, which is 1.67. Further, the elemental composition of nHAp was identified using X-ray photoelectron spectroscopy (XPS) and EDX analysis. The surface area (111.96 m2 g−1), pore size (14.81 nm in diameter), and pore volume (0.4167 cm3 g−1) of prepared nHAp were confirmed by the Brunauer-Emmett-Teller (BET). Atomic force microscopy (AFM) was employed to measure the shape parameters and surface roughness, and it was confirmed that nHAp has a dominant spiky surface. Transmission electron microscopy (TEM) showed the agglomerated rod-like nanostructured morphology of the nHAp powder. Thermogravimetric analysis (TGA) results of nHAp exhibited excellent thermal stability and a low weight loss (9.7 %). The mechanical properties of nHAp were checked using the measurement of compressive strength value, which was 114 ± 4.70 MPa. The hemolysis rate of nHAp powders was less than 3 %;hence, nHAp powders can be considered non-hemolytic material. The MTT results indicate that the prepared nHAp is more biocompatible with human osteosarcoma (MG-63) cells, which shows excellent cell viability compared to commercial hydroxyapatite (cHAp). Moreover, nHAp encourages the development of MG-63 cells, which exhibit better Giemsa staining and alkaline phosphatase (ALP) activity than cHAp. The size, structure, functional groups, compressiv

关键词： X ray photoelectron spectroscopy

来源：评论

学校读者我要写书评

暂无评论

A hybrid physics-data-driven surface roughness prediction model for ultra-precision machining

引用

Science China(Technological Sciences) 2023年第5期66卷 1289-1303页

作者： BAI Long YANG QiZhong CHENG Xin DING Yue XU JianFeng State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Wuhan Digital Design and Manufacturing Innovation Center Co. LtdWuhan430074China

The surface finish quality is critical to the service performance of a machined part,and single-point diamond ultra-precision machining can achieve excellent surface quality for many engineering *** study studied the problem of predicting the surface roughness for titanium alloy workpieces in ultra-precision *** data and surface roughness measurement results were obtained during end-face machining experiments.A deep learning neural network model was built based on the ResNet-50 architecture to predict surface *** propose increasing prediction accuracy by using the energy ratio difference(ERD)as a stability feature that can be extracted using fast iterative variational mode decomposition(FI-VMD).The roughness value obtained with an analytic model was also used as an input feature of the prediction *** prediction accuracy of the proposed approach was depicted to be improved by 8.7%with the two newly introduced roughness *** influence of the tool parameters on the prediction accuracy was investigated,and the proposed hybrid-driven model exhibited higher robustness to errors of the tool parameters than the analytic roughness model.

关键词： surface roughness ultra-precision machining prediction model stability feature

来源：评论

学校读者我要写书评

暂无评论

Hierarchical palladium catalyst for highly active and stable water oxidation in acidic media

引用

National Science Review 2023年第2期10卷 157-164页

作者： Jing Peng Haofeng Sun Kun Ni Jiajing Wu Xinyu Sun Yueqi Su Han Cheng Yuhua Liu Yuqiao Guo Wentuan Bi Yanwu Zhu Changzheng Wu Yi Xie Hefei National Laboratory for Physical Science at the Microscale CAS Center for Excellence in NanoscienceiChEM (Collaborative Innovation Center of Chemistry for Energy Materials) and CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China Institute of Energy Hefei Comprehensive National Science Center

Acidic water electrolysis is of great importance for boosting the development of renewable ***,it severely suffers from the trade-off between high activity and long lifespan for oxygen evolution catalysts on the anode *** is because the sluggish kinetics of oxygen evolution reaction necessitates the application of a high overpotential to achieve considerable current,which inevitably drives the catalysts far away from their thermodynamic equilibrium *** we demonstrate a new oxygen evolution model catalyst-hierarchical palladium（Pd） whose performance even surpasses the benchmark Ir-and Ru-based *** Pd catalyst displays an ultralow overpotential（196 mV）,excellent durability and mitigated degradation(66 μV h-1) at 10 mA cm-2in 1 M *** strain on Pd（111） facets weakens the binding of oxygen species on electrochemical etching-derived hierarchical Pd and thereby leads to two orders of magnitudes of enhancement of mass activity in comparison to the parent Pd bulk ***,the Pd catalyst displays the bifunctional catalytic properties for both oxygen and hydrogen evolutions and can deliver a current density of 2 A cm-2at a low cell voltage of 1.771 V when fabricated into polymer ele ctrolyte membrane ele ctrolyser.

关键词： palladium oxygen evolution reaction acidic condition strain electrolysis

来源：评论

学校读者我要写书评

暂无评论

Mechanical performance of 22SiMn2TiB steel welded with lowtransformation- temperature filler wire and stainless steel filler wire

引用

Journal of Iron and Steel Research International 2024年第4期31卷 967-981页

作者： Zi-dong Lin Kai-jie Song Zhen Sun Zi-qian Zhu Xue-feng Zhao Constantinos Goulas Wei Ya Xing-hua Yu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China Department of Design Production and Management Faculty of Engineering Technology.University of TwenteEnschede 7500 AETheNetherlands Rotterdam Additive Manufacture Fieldlab(RAMLAB) Rotterdam 3089 JWTheNetherlands

TX-80 low-transformation-temperature(LTT)welding wire was used to replace the traditional ER 307Si welding wire to realize the connection of 22SiMn2TiB armor steel in manual overlay *** previously existing issues,such as welding cracks,large welding deformation,and severe welding residual stress,were solved to ensure good strength and ductility *** particular,with the same welding conditions,TX-80 LTT wire eliminates welding *** reduces the welding deformation no matter the base pretreatment of pre-setting angle or no pre-setting *** comparison,it was found that the microstructure at the TX-80 weld is mainly composed of martensite and a small amount of retained *** contrast,the microstructure of the ER 307Si weld consists of a large amount of austenite and a small amount of skeleton-like *** variation trend of residual stress and microhardness from the weld to the base were investigated and compared with the mechanical properties of base *** TX-80 and the ER 307Si tensile samples elongation is 6.76%and 6.01%,while the ultimate tensile strengths are 877 and 667 MPa,*** average impact toughness at room temperature of the ER 307Si weld is 143.9 J/cm^(2),much higher than that of the TX-80 weld,which is only 36.7 J/cm^(2).The relationship between impact and tensile properties with microstructure species and distribution was *** addition,the fracture surface of the tensile and the impact samples was observed and *** dimples,fewer pores,larger radiation zone,and shear lips of TX-80 samples indicate better tensile ductility and worse impact toughness than those of ER 307Si weld.

关键词： Low-transformation-temperature material 22SiMn2TiB steel Welding deformation Residual stress Martensitic transformation Mechanical property

来源：评论

学校读者我要写书评

暂无评论

Detection of the farmland plow areas using RGB-D images with an improved YOLOv5 model

引用

International Journal of Agricultural and Biological Engineering 2024年第3期17卷 156-165页

作者： Jiangtao Ji Zhihao Han Kaixuan Zhao Qianwen Li Shucan Du College of Agricultural Equipment Engineering Henan University of Science and TechnologyLuoyang 471003HenanChina Science&Technology Innovation Center for Completed Set Equipment Longmen LaboratoryLuoyang 471023HenanChina Collaborative Innovation Center of Machinery Equipment Advanced Manufacturing of Henan Province Luoyang 471003HenanChina School of Art and Design Henan University of Science and TechnologyLuoyang 471003HenanChina

Recognition of the boundaries of farmland plow areas has an important guiding role in the operation of intelligent agricultural *** precisely recognize these boundaries,a detection method for unmanned tractor plow areas based on RGB-Depth(RGB-D)cameras was proposed,and the feasibility of the detection method was *** method applied advanced computer vision technology to the field of agricultural *** and improving the YOLOv5-seg object segmentation algorithm,first,the Convolutional Block Attention Module(CBAM)was integrated into Concentrated-Comprehensive Convolution Block(C3)to form C3CBAM,thereby enhancing the ability of the network to extract features from plow *** GhostConv module was also utilized to reduce parameter and computational ***,using the depth image information provided by the RGB-D camera combined with the results recognized by the YOLOv5-seg model,the mask image was processed to extract contour boundaries,align the contours with the depth map,and obtain the boundary distance information of the plowed ***,based on farmland information,the calculated average boundary distance was corrected,further improving the accuracy of the distance *** experiment results showed that the YOLOv5-seg object segmentation algorithm achieved a recognition accuracy of 99%for plowed areas and that the ranging accuracy improved with decreasing detection *** ranging error at 5.5 m was approximately 0.056 m,and the average detection time per frame is 29 ms,which can meet the real-time operational *** results of this study can provide precise guarantees for the autonomous operation of unmanned plowing units.

关键词： plow areas RGB-D camera YOLO object segmentation contour boundary average distance

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：