检索结果-内蒙古大学图书馆

engineering 2023年第2期21卷 61-74,M0004页

作者：高文迪乔智霞韩香广王小章 Adnan Shakoor 刘存朗卢德江杨萍赵立波王永录王久洪蒋庄德孙东 State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesOverseas Expertise Introduction Center for Micro/Nano Manufacturing and Nano Measurement Technologies Discipline InnovationXi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and SystemSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China Beijing Advanced Innovation Center for Intelligent Robots and Systems Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Robotics and Systems Harbin Institute of TechnologyHarbin 150006China Eleventh Research Institute Sixth Academy of China Aerospace Science and Technology Co.Xi’an 710100China Department of Control and Instrumentation Engineering King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Department of Biomedical Engineering City University of Hong KongHong Kong 999077China

本文介绍了一种基于横向可移动栅极场效应晶体管(LMGFET)的新型微型力传感器的开发。提出了一种精确的电气模型,用于小型LMGFET器件的性能评估,与以前的模型相比,其精度有所提高。采用了一种新型三明治结构,该结构由一个金交叉解耦栅阵... 详细信息

本文介绍了一种基于横向可移动栅极场效应晶体管(LMGFET)的新型微型力传感器的开发。提出了一种精确的电气模型,用于小型LMGFET器件的性能评估,与以前的模型相比,其精度有所提高。采用了一种新型三明治结构,该结构由一个金交叉解耦栅阵列层和两个软光阻层SU-8组成。通过所提出的双差分传感结构,LMGFET横向工作在垂直干扰下的输出电流被大大消除,所提出传感器的相对输出误差从4.53%(传统差分结构)降低到0.01%。提出了一种实用的传感器制造工艺,并对其进行了模拟。基于LMGFET的力传感器的灵敏度为4.65μA·nN^(-1),可与垂直可移动栅极场效应晶体管(VMGFET)器件相媲美,但非线性度提高了0.78%,测量范围扩大了±5.10μN。这些分析为LMGFET器件的电气和结构参数提供了全面的设计优化,并证明了所提出的传感器在生物医学显微操作应用中具有良好的力传感潜力。

关键词：力传感器场效应晶体管横向运动三明治结构电气模型显微操作非线性度双差分

来源：评论

学校读者我要写书评

暂无评论

A Novel Preparation Approach of Aluminum-Based Functionally Graded Material: Auxiliary Wire Filling Gas Metal Arc Directed Energy Deposition

SSRN

引用

SSRN 2024年

作者： Yu, Tianjian Qiang, Wei Lu, Hao Li, Pengyuan Wang, Tianze Chao, Yaojie School of Material Science and Engineering Xi’an Shiyou University Xi’an710065 China Key Laboratory of Controlled Arc Intelligent Additive Technology Ministry of Industry and Information Technology Nanjing University of Science and Technology Nanjing210094 China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China Dalian Changfeng Industrial Corporation Dalian116038 China

The 2319-1100 aluminum-based functionally graded material (FGM) with continuous gradient transition interface was fabricated by auxiliary wire filling gas metal arc directed energy deposition (AWF-GMA-DED) process via changing the auxiliary wire ER1100 feeding speed. The droplet transfer behavior of the main wire and auxiliary wire, deposition morphology, and evolution law of microstructure and mechanical properties of the gradient wall were analyzed. The results indicate that with the increase of the auxiliary wire ER1100 feeding speed, the transition process of the auxiliary wire droplet transfer mode is large droplet transfer—bridge transfer—continuous transfer, and the main wire ER2319 droplet transfer is stable and not affected by the auxiliary wire ER1100. At the same time, the bimetallic single deposition layer height and contact angle increase, and the penetration depth and area of the base metal penetration zone decrease. The 2319-1100 aluminum-based FGM prepared by auxiliary wire filling GMA additive manufacturing has good formation and free of defects. As the filling ratio of ER1100 increases, the area of interlayer equiaxed grain band and equiaxed grain size increases gradually, the continuity of eutectic structure at the grain boundary is weakened, and the eutectic structure is refined. When the ER1100 filling ratio increases from 0% to 35%, the microhardness decreases by 25.72 HV (29.1%), and the tensile strength only decreases by 21.46 MPa (8.77%). However, the elongation increases from 11.89% to 19.41%, and the corrosion resistance of the material also improves. © 2024, The Authors. All rights reserved.

关键词： Filling

来源：评论

学校读者我要写书评

暂无评论

Lightweight DCT-Like Domain Forensics Model for Adversarial Example 19th

Lightweight DCT-Like Domain Forensics Model for Adversarial ...

引用

19th International Workshop on Digital Forensics and Watermarking, IWDW 2020

作者： Zhao, Junjie Wang, Jinwei Nanjing University of Information Science and Technology Jiangsu210044 China State Key Laboratory of Mathematical Engineering and Advanced Computing Henan450001 China

ISBN: (纸本)9783030694487

Since the emergence of adversarial examples brings great security threat to deep neural network which is widely used in various fields, their forensics become very important. In this paper, a lightweight model for the forensics of adversarial example based on DCT-like domain is proposed. The DCT-like layer realizes the block conversion of data from the spatial domain to the frequency domain. Together with the color space transformation layer and the residual layer, the DCT-like layer realizes the simulation of JPEG quantization error. The feature statistical layer is used to obtain the statistical feature values of the feature map output by the frequency-division convolution, and at the same time, it also contains learnable hyperparameters. The group BN strategy ensures the effectiveness of the DCT-like layer and the feature statistical layer and promotes the accuracy of forensics. Experiments show that the proposed model not only reaches the highest accuracy we know, but also it only needs to train for one epoch to get a high-performance. © 2021, Springer Nature Switzerland AG.

关键词： Deep neural networks

来源：评论

学校读者我要写书评

暂无评论

A Hybrid EMI Filter Design for Motor Drive System Based on Common-Mode Impedance Optimization

A Hybrid EMI Filter Design for Motor Drive System Based on C...

引用

Power Electronics and Application Symposium (PEAS), IEEE International

作者： Jianrui Liu Dong Jiang She Yan Pengye Wang Weiheng He Qihong Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China GD Midea Heating & Ventilating Equipment Co. Ltd. Advanced Research Center Foshan China

The motor drive system is a widely studied power electronics application, with significant attention given to its electromagnetic interference (EMI) issues. Passive EMI filters (PEFs), composed of inductors and capacitors, are commonly employed to mitigate EMI. However, the size and weight of conventional common mode inductors with high inductance tend to cause heating and power loss problems. An alternative solution is the implementation of active EMI filters (AEFs), which significantly reduce the inductance value of common mode inductors, resulting in a smaller filter size and improved power density and efficiency for the electric drive system. In this study, a hybrid EMI filter is designed for motor drive systems featuring certain ground parasitic common-mode (CM) capacitance. By optimizing the impedance relationship, the proposed filter effectively suppresses CM noise in the frequency range of 150 kHz to 1 MHz, achieving noise reduction of 20–30 dB.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Fast and extensive intercalation chemistry in Wadsley-Roth phase based high-capacity electrodes

引用

Journal of Energy Chemistry 2022年第6期31卷 601-611,I0017页

作者： Miao Wang Zhenpeng Yao Qianqian Li Yongfeng Hu Xiuping Yin Aibing Chen Xionggang Lu Jiujun Zhang Yufeng Zhao Institute for Sustainable Energy&College of Sciences Shanghai UniversityShanghai 200444China Department of Chemistry and Chemical Biology Harvard University12 Oxford StreetCambridgeMA 02138United States Materials Genome Institute Shanghai UniversityShanghai 200444China Canadian Light Source 44 Innovation BoulevardSaskatoonSK S7N 2 V3Canada College of Chemical and Pharmaceutical Engineering Hebei University of Science and Technology70 Yuhua RoadShijiazhuang 050018China State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgyShanghai UniversityShanghai 200444 China Key Laboratory of Applied Chemistry Yanshan UniversityQinhuangdao 066004HebeiChina School of Resource and Environmental Sciences Wuhan UniversityWuhan 430072HubeiChina

Wadsley-Roth (W-R) structured oxides featured with wide channels represent one of the most promising material families showing compelling rate performance for lithium-ion ***,we report an indepth study on the fast and extensive intercalation chemistry of phosphorus stabilized W-R phase PNb_(9)O_(25) and its application in high energy and fast-charging *** explore the intercalation geometry of PNb_(9)O_(25) and identify two geometrical types of stable insertion sites with the total amount much higher than conventional intercalation-type *** reveal the ion transportation kinetics that the Li ions initially diffuse along the open type Ⅲ channels and then penetrate to edge sites with low kinetic *** the lithiation,no remarkable phase transition is detected with nearly intact host phosphorous niobium oxide ***,the oxide framework of PNb_(9)O_(25) keeps almost unchanged with all the fast diffusion channels and insertion cavities well-maintained upon cycling,which accomplishes the unconventional electrochemical performance of W-R structured electrodes.

关键词： Wadsley-Roth phase PNb_(9)O_(25) Intercalation chemistry Ion transportation kinetics Lithium-ion batteries

来源：评论

学校读者我要写书评

暂无评论

Low-Temperature Annealing Induced Hardening in fcc CoNiV Medium-Entropy Alloys

SSRN

引用

SSRN 2024年

作者： Wang, Yihan Wu, Yuan Yu, Yong He, Yang Yu, Xinyang Liu, Xiongjun Wang, Hui Jiang, Suihe Zhang, Xiaobin Lu, Zhaoping State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China Department of Materials Science and Engineering National University of Singapore 117575 Singapore Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China

Low temperature annealing of structural metallic materials is typically a process of removing residual stresses generated during the manufacturing process and reducing the tendency for distortion and cracking. This stress relief annealing normally leads to a certain degree of softening. In this study, nevertheless, we report that low temperature annealing in the fcc (face-centered-cubic) CoNiV medium entropy alloy (MEA) surprisingly induced hardening without appreciably sacrificing ductility, increasing the yield strength from 503 MPa to 653 MPa while maintaining approximately 60% plasticity. Interestingly, such low-temperature hardening effect is not significant in the similar CoNiCr MEA. Our analysis reveals that during low-temperature annealing, multi-scale local chemical structures (LCSs) in CoNiV were gradually developed, leading to the observed strengthening. In addition, the development of LCSs alters the underlying deformation mechanism by promoting dislocation slip planarity and reducing dislocation entanglement, thereby maintaining large ductility and work-hardening capability. In contrast, LCSs in CoNiCr exhibit high structural stability and are insensitive to low-temperature annealing, therefore their contribution to mechanical properties is marginal. These findings vividly verify that formation and stability of LCSs in MEAs are closely related to chemical compatibility of their constituent elements, such as atomic size and mixing enthalpy difference. Our current work also confirms that low temperature annealing is an effective strategy for optimizing atomic-scale structures in compositionally complex alloys, opening up a new avenue for further enhancing their overall properties. © 2024, The Authors. All rights reserved.

关键词： Stress relief

来源：评论

学校读者我要写书评

暂无评论

AGF-based optimization for wideband flat directional coupling and microring resonating

AGF-based optimization for wideband flat directional couplin...

引用

IEEE International Conference on Group IV Photonics

作者： Zhaonian Wang Jiangbing Du Ke Xu Zuyuan He State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China Department of Electronic and Information Engineering Harbin Institute of Technology (Shenzhen) Shenzhen China

ISBN: (数字)9798350394047

ISBN: (纸本)9798350394054

In this work, we presented directional couplers with wideband flat coupling-ratio and a microring resonator with wideband uniform extinction-ratio (ER) based on artificial-gaugefield optimization. Proof-of-concept results are obtained on SOI and SiN platforms, with 0.9dB coupling-ratio variation and 1.6dB ER variation over 100nm bandwidth.

关键词： Silicon compounds Couplings System performance Silicon photonics Wideband Optimization Directional couplers

来源：评论

学校读者我要写书评

暂无评论

Temperature Optimization for Efficient Power-to-Hydrogen Water Electrolysis

Temperature Optimization for Efficient Power-to-Hydrogen Wat...

引用

Sustainable Power and Energy Conference (iSPEC)

作者： Ke Chen Kewei Hu Jie Yang Feng Chen Jiakun Fang State Grid Hubei Electric Power Company Limited Economic Research Institute Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

This paper proposes an optimization model for temperature of water electrolyzers in pursuit of maximum power-to-hydrogen efficiency. Unlike the traditional operating strategy which controls constant temperature, the model aims at obtaining optimal temperature according to the variation of supplied current. In order to realize the maximum efficiency, the temperature-dependent electrochemical model of the electrolyzer, as well as the thermal model of the heater, is established. The optimal temperature occurs where the electrochemical loss and the thermal loss meet the balance. From the simulation results, the proposed model can acquire optimal temperature based on the supplied current, which can be applied to the scene of fluctuating power supply, e.g. wind and solar power. The test results show that up to 15% efficiency improvement can be achieved with the proposed temperature control method, compared with the traditional constant temperature control.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An Integrated Dual-mode Pulse-echo Ultrasonic Measurement System Under Pulsed/Static Magnetic Field

TechRxiv

引用

TechRxiv 2023年

作者： Qiu, Wenjie Zhang, Jian Luo, Yongkang Han, Xiaotao Wuhan National High Magnetic Field Center Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

Ultrasonic measurements at high magnetic field and low temperature necessitate ultra-fast excitations, ultra-high dynamic range of duty-cycle adjustments, as well as real-time, precise and automatic analysis. This paper proposes a dual-mode ultrasonic measurement system, which means the capability of carrying out acoustic measurements in both pulsed and static high magnetic field with low temperature. Based on the "counter-delay-chain" series structure and adaptive jitter compensation in the field-programmable-gate-array(FPGA), the timing control accuracy of 5 nanoseconds and the timing jitter below 160 picoseconds are realized for high-resolution excitation generation and precise sampling window adjustment. The duty cycle adjustment achieves a high dynamic range from 0.23 ppb to 10 % to realize both pulsed field mode and static field mode (denoted as PF-mode and SF-mode) ultrasonic measurements. The independent sampling window adjustment reduces the data size by more than 80%, extends the maximum testing duration and reduces the analysis consuming. Combined with the automatic cross-correlation analysis method, this system can automatically carry out PF-mode tests with a repetition rate above 100 kHz and SF-mode tests for hours with sound velocity accuracy of 2%. Experiments have proved the reliability and feasibility of the system and revealed its application prospect in condensed matter physics experiments. © 2023, CC BY-NC-SA.

关键词： Timing circuits

来源：评论

学校读者我要写书评

暂无评论

Ultralong organic room-temperature phosphorescence of electrondonating and commercially available host and guest molecules through efficient Förster resonance energy transfer

引用

Science China Chemistry 2021年第5期64卷 739-744页

作者： Yeling Ning Junfang Yang Han Si Haozhong Wu Xiaoyan Zheng Anjun Qin Ben Zhong Tang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesSCUT-HKUST Joint Research InstituteAIE InstituteCenter for Aggregation-Induced EmissionSouth China University of Technology(SCUT)Guangzhou 510640China Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials Key Laboratory of Cluster Science of Ministry of EducationBeijing Institute of TechnologyBeijing 100081China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionInstitute for Advanced Studyand Department of Chemical and Biological EngineeringThe Hong Kong University of Science&Technology(HKUST)Clear Water BayKowloonHong KongChina

Ultralong organic room-temperature phosphorescence(RTP)materials have attracted tremendous attention recently due to their diverse *** ultralong organic RTP materials mimicking the host-guest architecture of inorganic systems have been exploited ***,complicated synthesis and high expenditure are still inevitable in these ***,we develop a series of novel host-guest organic phosphorescence systems,in which all luminophores are electron-rich,commercially available and *** maximum phosphorescence efficiency and the longest lifetime could reach 23.6%and 362 ms,*** results and theoretical calculation indicate that the host molecules not only play a vital role in providing a rigid environment to suppress non-radiative decay of the guest,but also show a synergistic effect to the guest through Förster resonance energy transfer(FRET).The commercial availability,facile preparation and unique properties also make these new host-guest materials an excellent candidate for the anti-counterfeiting *** work will inspire researchers to develop new RTP systems with different wavelengths from commercially available luminophores.

关键词： room-temperature phosphorescence host-guest system Förster resonance energy transfer commercial luminophore anti-counterfeiting

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：