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International Joint conference on Energy, Electrical and Power engineering , coEEPE 2021

作者： Li, Jingsong Liang, Zhenzong Li, Linyu Qi, Yushuai Li, Guofeng Zheng, Nianfeng Wang, Zhongqing School of Electrical Engineering Dalian University of Technology Dalian116024 China R&D LUTE Electric Co. Ltd. Jining272200 China

ISBN: (纸本)9789811931703

The magnetic-force–deformation model due to magnetostriction (MS) strain and Maxwell stress model caused by joints are developed based on the major sources of vibration and acoustic noise in power transformer core in this paper. On the basis of the forces created by the two sources, the core vibration is calculated by the structure finite element method (SFEM), and then calculate the acoustic noise. Meanwhile, a three-dimensional (3-d) structure model of power transformer is constructed, the natural frequencies and vibration modes of each order modal of the main system components are obtained according to the modal analysis, and sufficient experimental testing is used to verify all the steps of the study in detail. In the end, a novel ontological structure design with the core and windings position interchange is put forward. The testing results of the prototype show that it is an effective means to reduce vibration and acoustic noise of power transformer. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte ltd.

关键词： deformation

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risk analysis of signal system renovation for urban rail transit

Risk analysis of signal system renovation for urban rail tra...

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2024 International conference on Signal Processing and communication Security, ICSPCS 2024

作者： Yu, Yi Chu, Pengzi Xu, Ye Wang, Lianfeng Yuan, Jianjun Maglev Transportation Engineering R&D Center Tongji University Shanghai201804 China Technology Center Shanghai Shentong Metro Group Co. LTD. Shanghai201103 China Casco Signal Co. LTD. Shanghai200071 China Telecom & Signal Branch of Shanghai Metro Maintenance and Support Co. LTD. Shanghai200235 China

ISBN: (纸本)9781510681699

Urban rail transit is the backbone of public transport, which needs to maintain the daily operation order as far as possible. due to aging equipment, technological innovation, unequal supply, demand, etc., renovation projects have become a key link in the life cycle management of urban rail transit. Signal system affects operation safety and efficiency, and it is necessary to avoid operation influence as much as possible. Given the potential risks in a renovation of signal systems have not been fully discussed, combined with a specific project of "CBTC + TBTC", the main risks related to the signal system are identified, the number of risk events and their levels are determined with the help of the risk grade matrix, and the risk management strategy is given accordingly, which has guiding value for the relevant engineering practice. © 2024 SPIE.

关键词： risk analysis

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Upgradation of Heavy Crude Oil Via Hydrodynamic Cavitation Through Variations in Asphaltenes

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China Petroleum Processing & Petrochemical technology 2022年第2期24卷 23-33页

作者： Li Kang Han Haibo Lei Jie Wang Youhe Li dekun Mark J.rood Fazle Subhan Yan Zifeng State Key Laboratory of Heavy Oil Processing China University of PetroleumQingdao 266580China Luoyang R&D Center of Technology of Sinopec Engineering(Group)Co.Ltd. Luoyang 471003China Shandong Oil Refining Association Jinan 250013China Department of Civil and Environmental Engineering University of IllinoisIL 61801USA Department of Chemistry Abdul Wali Khan University MardanMardanKPPakistan

In this work,Saudi heavy crude oil(SHco)was upgraded by the hydrodynamic cavitation *** collapse of cavitation bubbles instantly produces extreme conditions such as high temperature,pressure,and jet flow and strong shear forces,which can play a significant role in the upgradation *** results revealed that the viscosity and conradson carbon residue of SHco decreased from 13.61 to 7.22 mm^(2)/s and from 7.16%to 6.48%,*** boiling point distillation findings showed that the vacuum residue(Vr)decreased by 1%.Atmospheric-pressure photoionization Fourier-transform ion cyclotron resonance mass spectrometry,X-ray diffraction,dynamic light scattering,Fourier-transform infrared spectroscopy,and scanning electron microscopy were employed to characterize the molecular composition,crystalline structure,asphaltene aggregate particle size distribution,functional groups,and morphology,respectively,to understand the effects of hydrodynamic cavitation on *** obtained results demonstrate that hydrodynamic cavitation upgradation reduced the interaction forces between the asphaltene molecules,weakening the crystalline structure of the asphaltene aggregates,reducing the degree of association of the aromatic compounds in SHco and asphaltenes,and decreasing the average particle *** delayed coking properties of the Vr were further investigated,and the cavitation treatment was found to decrease the coke yield by 1.85%and increase the liquid and gas yields by 1.52%and 0.33%,***,hydrodynamic cavitation can effectively enhance the processing performance of crude oil by improving the properties and structural characteristics of asphaltenes.

关键词： hydrodynamic cavitation heavy oil upgradation asphaltene crystalline structure particle size distribution agglomeration force

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A 24-MHZ relaxation Oscillator without comparators 6

A 24-MHZ Relaxation Oscillator without Comparators

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6th International conference on Electronics technology, ICET 2023

作者： Liu, Zhenyang Jin, Leisheng Zhang, Ming Zhu, Chuansen Zhao, dongmin Meng, Zijie Nanjing University of Posts and Telecommunication Jiangsu Runic Technology Co. Ltd. Shanghai China Nanjing University of Posts and Telecommunication School of Integrated Circuit and Science and Engineering Nanjing China Jiangsu Runic Technology Co. Ltd. R&d Department Shanghai China Peking University Jiangsu Runic Technology Co. Ltd. Shanghai China

ISBN: (纸本)9798350337693

With the development of information technology, the signal quality of clock source is increasingly required in IOT devices. In this paper, a novel relaxation oscillator with threshold voltage detection technology and voltage feedback technology is presented to solve the problem of temperature drift and the variation of offset voltage of the oscillation frequency existing in traditional relaxation oscillators. The proposed oscillator does not contain the comparator structure, but detects the threshold voltage through the NMOS tube and feedback resistance module, which eliminates the oscillation frequency instability caused by the existence of the comparator delay and reduces the cost of the circuit. A simulation with typical frequency of 24.0MHz is carry out in HHGrace 110nm CMOS process library and the measured frequency variation is ± 0.42% for temperature changes from -40°C to 85°C, and ± 0.83% for supply changes from 1.4V to 1.6V. The simulation results show that the proposed structure has lower temperature drift and less frequency effect of unstable supply voltage. © 2023 IEEE.

关键词： Threshold voltage

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Spatio-Temporal Graph Network-Based Traffic Forecasting Method 4

Spatio-Temporal Graph Network-Based Traffic Forecasting Meth...

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4th International conference on Artificial Intelligence, robotics, and communication, ICAIrC 2024

作者： Zhang, Ning Li, Kaimeng Zhang, Xiangyue Wang, Wenjing Li, Chao Kang, Yuyun School of Logistics Linyi University LYU Linyi China School of Information Science and Engineering Linyi University LYU Linyi China School of Mathematics and Statistics Linyi University LYU Linyi China Top Information Technology Co. LTD. TITC Technology R&D Department Jinan China

ISBN: (纸本)9798331531225

Traffic forecasting is widely recognized as a fundamental component of smart city development;however, classic models struggle to manage long-term time series data effectively. In other words, existing models rely on multiple algorithm modules, which significantly increase computational costs and, in turn, reduce model accuracy. Furthermore, any new input dataset requires retraining the model from scratch. To address these challenges, this study proposes a novel approach, where a long-sequence embedding module and an encoder-decoder structure integrating a temporal attention layer and a graph convolution operator are introduced during the pretraining section. In the fine-tuning section, the learned parameters are frozen, and the decoder is replaced with a prediction header that incorporates a meta-learning module. This approach enables the integration of both long-term and short-term time series data while facilitating training tailored to specific target tasks. The method has demonstrated strong performance on real-world datasets, providing clear evidence of its effectiveness in addressing traffic forecasting challenges. © 2024 IEEE.

关键词： decoding

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Promotional effect of cobalt doping on catalytic performance of cryptomelane-type manganese oxide in toluene oxidation

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Journal of Environmental Sciences 2023年第4期126卷 263-274页

作者： Ning dong Mengyue Chen Qing Ye dan Zhang Hongxing dai Key Laboratory of Beijing on Regional Air Pollution Control Department of Environmental ScienceSchool of Environmental and Chemical EngineeringFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China R&D Department of Atmospheric Prevention and Control Technology Guangdong Suncere Technology Co.Ltd.Guangzhou 510220China Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution ControlKey Laboratory of Advanced Functional MaterialsEducation Ministry of Chinaand Laboratory of Catalysis Chemistry and NanoscienceDepartment of Environmental Chemical EngineeringSchool of Environmental and Chemical EngineeringFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China

The cryptomelane-type manganese oxide (OMS-2)-supported co (x co/OMS-2;x=5,10,and15 wt.%) catalysts were prepared via a pre-incorporation *** as-prepared materials were used as catalysts for catalytic oxidation of toluene (2000 ppmV).Physical and chemical properties of the catalysts were measured using the X-ray diffraction (Xrd),Fourier transform infrared spectroscopic (FT-Ir),scanning electron microscopic (SEM),X-ray photoelectron spectroscopy (XPS),and hydrogen temperature-programmed reduction (H_(2)-TPr)*** all of the catalysts,10co/OMS-2 performed the best,with the T90%,specific reaction rate at 245℃,and turnover frequency at 245℃ (TOFco) being 245℃,1.23×10^(-3)moltoluene/(gcat·sec),and 11.58×10^(-3)sec-1for toluene oxidation at a space velocity of 60,000mL/(g·hr),*** excellent catalytic performance of 10co/OMS-2 were due to more oxygen vacancies,enhanced redox ability and oxygen mobility,and strong synergistic effect between co species and OMS-2 ***,in the presence of poisoning gases co_(2),SO_(2)or NH_(3),the activity of 10co/OMS-2 decreased for the carbonate,sulfate and ammonia species covered the active sites and oxygen vacancies,*** the activation treatment,the catalytic activity was partly *** good low-temperature reducibility of 10co/OMS-2 could also facilitate the redox process accompanied by the consecutive electron transfer between the adsorbed O_(2)and the cobalt or manganese *** the oxidation process of toluene,the benzoic and aldehydic intermediates werefirst generated,which were further oxidized to the benzoate intermediate that were eventually converted into H_(2)O and co_(2).

关键词： Cryptomelane-type manganese oxide cobalt doping Volatile organic compound Toluene oxidation

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Characterizations for eWLB (Embedded Wafer Level Ball Grid Array) Antenna in Molded Package Integrations in 77GHz Automotive Applications

Characterizations for eWLB (Embedded Wafer Level Ball Grid A...

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作者： Hsieh, Ming-Che Zhang, Frank Zhu, Forest Liu, Kang Chua, Linda Lin, Yaojian damalerio, Joel Goh, Hin Hwa Kai Chen, Zihao Field Applications Engineering JCET Group Co. Ltd. Singapore Andar Technologies Co. Ltd. Hangzhou China Research & Design Dept. Andar Technologies Co. Ltd. Hangzhou China R&D Engineering JCET Group Co. Ltd. Singapore Chong Chan Process Engineering JCET Group Co. Ltd. Singapore College of Electronics and Information Engineering Harbin Institute of Technology Shenzhen China

The worldwide IC market has had a significant growth rate in recent years, driving diversified package solutions in the segments of communication, computing, consumer, automotive, industrial, etc. Among these market segments, the automotive market is forecast to have the strongest CAGr (compound Annual Growth rate) of any of the end-use segments in the next 5 years, which results in more IC packages and components being designed into automotive vehicle systems such as infotainment, AdAS (Advance driving Assistance System), instrumentation, body systems, battery control systems and so on. In these applications, the 77GHz short-range radar sensor application that can enable higher EIrP (Effective Isotropic radiated Power) and adaptive cruise control performance has become more attractive to be commercialized. due to the benefits of shorter interconnection length, lower conductive loss with smooth Cu surface as well as a lower dielectric constant and dielectric loss of materials in a fan-out wafer level package (FOWLP) technology, the FOWLP is proven as a suitable packaging solution to achieve the high speed and frequency requirements in 5G and mmWave applications. The eWLB Embedded Wafer Level Ball Grid Array) is a versatile FOWLP technology, providing a robust package platform in a space-efficient design with the very dense interconnection and routing of multiple dies as well as a smaller footprint and lower package profile providing a reliable package solution. Meanwhile, since the utilization of an antenna that is integrated into the packages has been studied as a low-cost solution because the packages can be tested in normal Fr4 printed circuit board (PCB) instead of the rF function integrated PCB, the eWLB integrated with molded antenna chip packages (called eWLB antenna in molded package) technology is introduced in this paper. The characterizations for assembly process challenges are evaluated and illustrate the process optimizations of equipment handling, ante

关键词： Scattering parameters

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Characterizations for eWLB (Embedded Wafer Level Ball Grid Array) Antenna in Molded Package Integrations in 77GHz Automotive Applications 24

Characterizations for eWLB (Embedded Wafer Level Ball Grid A...

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24th European Microelectronics and Packaging conference, EMPC 2023

作者： Hsieh, Ming-Che Zhang, Frank Zhu, Forest Liu, Kang Chua, Linda Lin, Yaojian damalerio, Joel Goh, Hin Hwa Chan, Kai Chong Chen, Zihao Field Applications Engineering JCET Group Co. Ltd. Singapore Chief Executive Officer Andar Technologies Co. Ltd. Hangzhou China Andar Technologies Co. Ltd. Research & Design Dept. Hangzhou China R&D Engineering JCET Group Co. Ltd. Singapore Process Engineering JCET Group Co. Ltd. Singapore College of Electronics and Information Engineering Harbin Institute of Technology Shenzhen China

ISBN: (纸本)9780956808691

关键词： Scattering parameters

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Cross-Layer Joint Scheduling Scheme for relay-Involved d2d communications in Cellular Systems 4th

Cross-Layer Joint Scheduling Scheme for Relay-Involved D2D C...

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4th EAI International conference on 6G for Future Wireless Networks, 6GN 2021

作者： Wang, Kaixuan Qin, Zhiliang Bi, Xixi Ma, ruofei Department of Communication Engineering Harbin Institute of Technology Weihai Weihai China Technology R&D Center Weihai Beiyang Electric Group Co. Ltd. Weihai China

ISBN: (纸本)9783031042447

In order to further improve the system performance under device-to-device(d2d) communication, considering the reuse of d2d mode is a very promising way. However, involving the reuse mode will make the design of scheduling scheme at the base station (BS) side even more challenging. This work focuses on the design of a scheduling scheme involving multiplexing relay d2d mode for the base station which jointly considers the user's requirements of service quality and delay comprehensively, and proposes a cross-layer joint scheduling algorithm aiming at maximizing the transmission rate of the whole system. We formulate such a scheduling issue into a mathematical optimization problem, and then we decompose the problem into three sub-problems according to power allocation, channel allocation and mode selection, and solve them respectively. The simulation results verify the importance of considering the multiplexing relay d2d mode and the influence of some main parameter Settings on the delay and transmission rate of the system, which provides a reference value for improving the transmission rate of the system by changing the parameter of the system. © 2022, ICST Institute for computer Sciences, Social Informatics and Telecommunications engineering.

关键词： Channel state information

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Monitoring and identification of spoilage-related microorganisms in braised chicken with modified atmosphere packaging during refrigerated storage

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Food Science and Human Wellness 2023年第1期12卷 28-34页

作者： Yang Lei Yali Zhang Yiqun Cheng Jichao Huang Ming Huang Key Laboratory of Meat Processing and Quality Control Ministry of EducationCollege of Food Science and TechnologyNanjing Agricultural UniversityNanjing 210095China National R&D Center for Poultry Processing Jiangsu Research Center for Livestock and Poultry Products Processing Engineering TechnologyNanjing Huangjiaoshou Food Science and Technology Co.Ltd.Nanjing 211225China College of Environmental Science&Engineering Institute of Functional FoodAnhui Normal UniversityWuhu 241000China College of Engineering Nanjing Agricultural UniversityNanjing 210031China

This study mainly monitored the dominant bacterial populations and identified the spoilage-related microorganisms of braised chicken meat stored under different co_(2)-modified atmosphere packaging(MAP)during refrigerated storage using a culture-dependent method and 16S rdNA *** quality changes and shelf life of the meat were also *** growth rate of total viable count(TVC)in braised chicken was slower with an increase of co_(2) content in MAP,which also occurred in the remaining bacterial species monitored(lactic acid bacteria,Pseudomonas spp.,Brochothrix thermosphacta).The MAP exerted beneficial effects on the quality of braised chicken,as demonstrated by retarding the production of total volatile basic nitrogen(TVB-N)and delaying lipid oxidation(TBArS test).A total of 14 isolates were identified from braised chickens with different packaging at the end of storage,these included ***(6 isolates),***(2 isolates),Enterococcus faecalis(3 isolates),***(2 isolates),Staphylococcus equorum(1 isolate).

关键词： Braised chicken Modified atmosphere packaging(MAP) 16S rdNA identification Shelf-life

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