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SSrN 2024年

作者： Liu, Xiao-Lei du, Hua-Yun Jia, Jianwen Wei, Ying-Hui Hou, Li-Feng Wang, Qian He, Hong-Wei Wei, Huan Liu, Xiao-da Zhou, Yan Gao, Yi-Bin Department of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China Aluminum-Magnesium Based New Material R&D Co. Ltd. Xing Xian County Economic and Technological Development Zone Lvliang035300 China Taiyuan University of Technology China

The effect of temperature and humidity alternation on the corrosion behavior and mechanical properties of 6061 aluminum alloy in a simulated urban industrial atmospheric environment was investigated and analyzed by weightlessness method, scanning electron microscope (SEM), energy dispersive spectrometer (EdS), Fourier infrared spectroscopy (FT-Ir), X-ray diffraction (Xrd), and dynamic potential polarization (LSV). The fluctuation of the composition, structure and morphology of the corrosion product layer are studied, the entry of corrosive medium destroy the densification and the second phase bring the potential difference, which causes the corrosion to expand internally and accelerates the localized corrosion. The corrosion rate shows a trend of first gradually increasing and then decreasing, corresponding to the formation of the initial oxide film hinders the corrosion, and then the local product film separation leads to the weakening of the corrosion resistance. The mechanical properties are significantly reduced after corrosion, and the fracture mechanism is transformed from the ductile fracture to the cleavage fracture gradually. © 2024, The Authors. All rights reserved.

关键词： ductile fracture

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Moisture Absorption Analysis in Silicone Gel for Power Modules: Experiments and Modeling

Moisture Absorption Analysis in Silicone Gel for Power Modul...

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International conference on condition Monitoring and diagnosis, CMd

作者： Takahiro Umemoto Masahiro Sato Tatsuki Nawata Kunihiko Hidaka Sho Takano Yuji Hayase Keisuke Yamashiro Akiko Kumada Dept. of Electrical Engineering and Information Systems The University of Tokyo Tokyo Japan Dept. of Electrical and Electronic Engineering Tokyo Denki University Tokyo Japan Advanced Technology Laboratory Corporate R&D Headquarters Fuji Electric Co. Ltd. Tokyo Japan

ISBN: (数字)9788986510225

ISBN: (纸本)9798350353877

Silicone gel is widely used as encapsulation material in power modules due to its unique properties, such as elasticity, adhesion, self-healing, and superior dielectric strength. However, it is generally known to be highly hygroscopic due to its microscopic porous structure. rapid temperature changes in a high-humidity environment beyond the expected operating conditions of power modules may cause condensation within the gel, resulting in degradation of electrical insulation performance and dielectric failure. Hence, it is crucial to conduct a quantitative analysis of the moisture absorption and desorption behaviors in the gel. In this study, a measurement system was constructed using commercially available humidity sensors to obtain the temporal and spatial distribution of moisture within the gel under high-temperature and high-humidity conditions. In addition, a numerical simulation of moisture absorption and desorption was developed based on the moisture diffusion equation, successfully replicating the experimental results.

关键词： Graphical models Absorption Statistical analysis Humidity measurement Moisture Multichip modules Humidity Numerical simulation Mathematical models Sensors

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double-Joint Motion Planning Method in Park based on High-definition Map

Double-Joint Motion Planning Method in Park based on High-De...

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2021 China Automation congress, CAC 2021

作者： Sa, Xijing Huang, Hongcheng Gao, ruijin School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China Engineer Technology Department Shanghai Intelligent and Connected Vehicle R&D Center CO.LTD Shanghai China

ISBN: (纸本)9781665426473

In order to solve the turning problem in narrow space, double-Joint Method is proposed in this paper. The spiral has a continuous curvature, but rarely considers road boundary and shape constraints. On the other hand, High-definition map provides prior information of road for motion planning. double-Joint Method utilizes road boundary and curvature of map to determine the target area and a series of pseudo target points of motion planning, generates a series of path respectively, and then design the cost function for selection. Above all, path generation employs two joints for shape determination of cubic spiral by designing the objective function and combining road structure information. The method adds a joint near turning to allow the path more flexible without increasing the degree of the curve. VTd-rOS simulation platform is built to verify. Theoretical and simulation results display proposed method can guide the vehicle turning right in narrow space to obtain a larger turning radius through lane borrow without loss of smoothness. And it is feasible to sacrifice the accuracy of reaching target points to suit special scenario. © 2021 IEEE

关键词： Autonomous vehicles

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A Load Balancing Method of New Energy Specialized Chip Based on Segments division Adjustment

A Load Balancing Method of New Energy Specialized Chip Based...

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IEEE conference on Energy Internet and Energy System Integration (EI2)

作者： dehong Liu Wei Xi Ming Hu Xiaohua Li Zexiang Cai Xuran Liang Technology R&D Center China Southern Power Grid Digital Power Grid Research Institute Co. Ltd. Guangzhou China School of Electric Power Engineering South China University of Technology Guangzhou China

Currently, there is a growing proportion of distributed new energy in the distribution network. Unlike in the past, the widespread integration of new energy sources brings forth a multi-timescale phenomenon in the electric tasks now. When the new energy specialized chip receives the tasks, the imbalance of load will be strengthened. consequently, an approach for balancing load is proposed in the context of new energy, which is based on segments division adjustment. The first step involves establishing a resource demand matrix based on the classification and modeling of electric tasks characteristics. Subsequently, the duty cycle adjustment scheme and flattened adjustment scheme are proposed for different segments under the regular scenes. Ultimately, the characteristics of the electric tasks serve as the foundation for the development of a backward flattening processing model in the sudden scenes. The effectiveness of the proposed optimization strategy is demonstrated by the simulation result that it will reduce the imbalance of the resource demand curve in both regular and sudden scenes.

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Fretting Wear Mechanism of Nuclear Fuel Cladding Tube Under different Tangential displacement

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SSrN 2024年

作者： Li, Jialing Shen, Huoming Liao, Yehong Wang, Yuxing Jin, Songye Peng, Zhenxun Wang, Kaimo ren, Qisen School of Mechanics and Aerospace Engineering Southwest Jiaotong University Chengdu611756 China School of Mechanical Engineering Southwest Jiaotong University Chengdu611756 China Department of ATF R&D China Nuclear Power Technology Research Institute Co. Ltd Shenzhen518000 China

The fretting wear behavior of Zr-1Nb alloy cladding tubes under different tangential displacement amplitudes under grid-to-rod contact conditions was investigated. The dependence of the morphology of wear scars, microstructure, and wear mechanisms on the tangential displacement amplitudes were analyzed. The results indicate that as the tangential displacement amplitude increases, the fretting regime transitions from the mixed fretting regime to the gross slip regime gradually. And the coefficient of friction initially increases and then decreases, while the wear volume and maximum wear depth gradually increase. In the mixed fretting regime, the primary wear mechanism is adhesive wear, whereas the primary wear mechanism in the gross slip regime is delamination. Moreover, the extent of oxidative wear becomes more severe while the tangential displacement amplitude is larger. © 2024, The Authors. All rights reserved.

关键词： Morphology

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Strategy of preparing Smco based films with high coercivity and remanence ratio achieved by temperature and chemical optimization

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Journal of rare Earths 2024年第7期42卷 1289-1297,I0004页

作者： Yansong Gong Zhaoguo Qiu Sizhe Liang Xinrui Zheng Hongxia Meng Zhigang Zheng deyang Chen Shengfu Yuan Weixing Xia dechang Zeng J.P.Liu School of Materials Science and Engineering South China University of TechnologyGuangzhou510640China Zhongshan R&D Center for Materials Surface and Thin Films Technology of the South China University of Technology Gent Materials Surface Technology(Guangdong)Co.Ltd.Zhongshan528437China Institute for Advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China Yangjiang Branch Guangdong Laboratory Materials Science and Technology Yangjiang Advanced Alloys LaboratoryYangjiang529500China Laboratory of Rare-Earth Magnetic Functional Materials Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo315201China Department of Physics University of Texas at ArlingtonArlingtonTX76019USA

Smco based films with excellent intrinsic magnetic properties have promising applications in micro-electro-mechanical system(MEMS).However,due to the complexity of phase composition and uncontrollable crystallization degree of Smco hard magnetic phase in the film,both the coercivity(Hc)and remanence(Mr)of films are difficult to enhance *** this paper,Smco based films were deposited with a Cr underlayer and capping layer on single crystal Si substrates via magnetron sputtering *** effects of annealing parameters and Sm/co atomic ratio on the phase structure and coercivity of films are *** adjusting the Sm/co atomic ratio from 1:5 to 1:4,co soft magnetic phase disappears and the single phase Smco5 is obtained,leading to the increase of coercivity of the films from 30 to 34 *** influence of deposition temperature and Cu doping on magnetic properties of Smco based films was *** the deposition temperature increases from room temperature to 250℃,the coercivity will further increase from 34 to 51 ***,a severe kink is observed in the demagnetization curves due to the poor exchanged *** analysis of transmission electron microscopy(TEM)confirms that the average size of non-hard magnetic amorphous phase exceeds the effective exchanged coupling length of Smco5,which contributes to the decoupling and low remanence ***,doping Cu and applying a post-annealing process can significantly improve the crystallization degree of the *** the coercivity and the remanence ratio of the demagnetization curves are greatly *** propose a plausible strategy to prepare the Smco based films with high coercivity and remanence ratio by temperature and chemical optimization,which can be utilized in high performed MEMS devices.

关键词： rare earths Smco based films Phase composition Crystallization conditions coercivity remanence ratio

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Hybrid silicon-barium-titanate tunable racetrack resonators based on chemical solution deposition

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Advanced Photonics Nexus 2024年第6期3卷 38-46页

作者： Lei Zhang Xin Wang Yong Zhang Jian Shen Chenglong Feng Jian Xu Min Liu Wei Wang Yongqiang deng Yang Xu Yi Li Guofeng Yin Yikai Sua Shanghai Jiao Tong University State Key Lab of Advanced Optical Communication Systems and NetworksDepartment of Electron EngineeringShanghaiChina East China Normal University State Key Laboratory of Precision SpectroscopyShanghaiChina Shanghai Jiao Tong University Center for Advanced Electronic Materials and DevicesShanghaiChina Shanghai IndustrialμTechnology Research Institute ShanghaiChina Beijing R&D Institute VanJee TechnologyBeijingChina Wuhan Enlarging Photonics Technology Co.Ltd. WuhanChina

Integrated electro-optic tuning devices are essential parts of optical communication,sensors,and optical machine *** the available materials,silicon is the most promising for on-chip signal processing and ***,silicon is limited owing to the absence of efficient Pockels electro-optic ***,we propose a new hybrid silicon-barium-titanate(Si-BTO)integrated photonic platform,in which the BTO thin film is deposited by the chemical solution deposition(CSd)method.A tunable racetrack resonator is demonstrated to confirm the Pockels electro-optic tuning potential of the BTO thin *** hybrid racetrack resonator has a tuning efficiency of 6.5 pm∕V and a high-power efficiency of 2.16 pm∕***,the intrinsic quality factor of the fabricated racetrack resonator is 48,000,which is the highest in hybrid Si-BTO platforms,to the best of our *** high-speed test verifies the stability of the racetrack *** hybrid Si-BTO technology based on the CSd method has the advantages of low equipment cost and simple fabrication process,which holds promise for low-power electro-optic tuning devices.

关键词： barium titanate chemical solution deposition electro-optic tuning resonator

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An Optimization Method for LdO design Based on ANN Algorithm

An Optimization Method for LDO Design Based on ANN Algorithm

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IEEE International conference on Electronic Information and communication technology (ICEICT)

作者： Qing Xu Ying He Guangsheng Lai Qingzhou Wang Yanhui Sun Qingjia Jia Yuanyue Li rui Chen Zhao Yao Wanlian Index (Qingdao) Information Technology Co. LTD Qingdao University Qingdao China College of Electronics and Information Qingdao University Qingdao China College of Engineering Chengdu College of University of Electronic Science and Technology Chengdu China EDA R&D Department Qingdao Zhancheng Technology Co. LTD Qingdao China Engineering Department Qingdao Zhancheng Technology Co. LTD Qingdao China

In order to solve the issues of long design cycles and low efficiency of integrated circuit design., a new method combining ANN algorithm was proposed to improve the comprehensive performance of LdO circuits. In this paper., the device parameters and corresponding performance of the LdO circuit were collected as a dataset to train the ANN model. When given the specific target performance of the LdO circuit., the model can predict the optimal device parameters corresponding to the performance., achieving the synchronous improvement of the four key parameters of PM, UGBW., PSrr., and I Q . The results show that the r 2 of the ANN model can be as high as 0.982. Therefore., the proposed method in this paper can effectively accelerate the design of LdO and improve its comprehensive performance.

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ZK60 based alloys with high-strength and high-ductility:A review

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resources Chemicals and Materials 2023年第2期2卷 151-166页

作者： Qiang Yang Zefeng Xie Jun Li Shuhui Lv Wei Zhang ruizhi Wu Hucheng Pan rongguang Li Xin Qiu State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022PR China School of Materials Science and Engineering Changchun University of Science and Technology130022PR China Department of China FAW Co. Ltd.R&D Institute PrototypingChangchun 130011PR China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001PR China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang 110819PR China School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142PR China

Wrought magnesium alloys with high-strength and high-ductility property have been attracting more and more interest in automotive and aerospace industries,and the conventional Mg-Zn based alloys are widely accepted as the representative *** of Mg-Zn based alloys with rare earth(rE)element additions and with modified preparation processes domains the evolution of their potential structural ***,their highest tensile yield strength(TYS)is still in the order of 400 MPa,clearly lower than that of the Mg-rE based alloys,in the order of 500 MPa,much less compared with the high-strength aluminum alloys and titanium *** to many previous investigations,two relatively efficient methods to improve mechanical properties of ZK based alloys were revealed as:alloying by rE and optimizing wrought ***,comprehensive combinative investigation was hitherto not conducted to ***,it is imperative in the next work to further improve the yield strength to the order of 500 MPa or much higher,and simultaneously modify the tension-compression strength asymmetry of the ZK series ***,developing novel wrought processes for ZK60(+rE)alloys or exploring appropriate pre-dealing treatments before or after the wrought processes might be an important approach to accomplish a much higher level of balance of high-strength and high-ductility.

关键词： Magnesium alloys High-strength and high-ductility

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257 W/cm2 power-density laser-driven white-light source for high-speed inspection in semiconductor packaging

SSRN

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SSrN 2024年

作者： Won, Seungjai Kim, Taewon Ji, Wonsoo Jung, Sejin Kim, Seung-Woo Kim, Young-Jin Department of Mechanical Engineering Korea Advanced Institute of Science and Technology 291 Daehak-ro Daejeon Korea Republic of Solution R&D Center Envision Co. Ltd 98 Gasan digital 2-ro Geumcheon-gu Seoul Korea Republic of

The demand for high-power-density white-light sources has been increased for high-speed inspection of semiconductor and display products. However, focusing the conventional halogen lamps or light-emitting diodes (LEds) remains challenging due to the large emission area at the light sources, which is governed by the étendue limit. Here, we report a high-power-density light illumination of the laser-driven white-light with a small focal spot size of 25 μm. By using a laser diode (Ld) instead of an LEd, the strong optical power can be concentrated on to the phosphor in a small spot size near the diffraction limit, enabling the emission of low-étendue luminescence. The blue Ld pump (λ=445 nm) and broad yellow luminescence (λ=480-750 nm) were focused together on to the sample with a small spot diameter of 25 μm (full width at half maximum, FWHM), producing a record-high power-density of 257 W/cm2. The speckle constants of the blue Ld, yellow luminescent light, and combined white-light after passing through the diffuser plate were carefully evaluated to 0.28, 0.02, and 0.14, respectively. Furthermore, the power scalability was demonstrated by spatially combining the independently generated white-light sources, which did not show any noticeable coherent speckle increase. This tightly-focusable laser-driven white-light will find its strong potential in next-generation high-speed inspection of advanced semiconductor packaging. © 2024, The Authors. All rights reserved.

关键词： Light emitting diodes

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